v4.19.13 snapshot.
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
new file mode 100644
index 0000000..613282c
--- /dev/null
+++ b/net/ipv6/Kconfig
@@ -0,0 +1,338 @@
+#
+# IPv6 configuration
+#
+
+# IPv6 as module will cause a CRASH if you try to unload it
+menuconfig IPV6
+ tristate "The IPv6 protocol"
+ default y
+ ---help---
+ Support for IP version 6 (IPv6).
+
+ For general information about IPv6, see
+ <https://en.wikipedia.org/wiki/IPv6>.
+ For specific information about IPv6 under Linux, see
+ Documentation/networking/ipv6.txt and read the HOWTO at
+ <http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/>
+
+ To compile this protocol support as a module, choose M here: the
+ module will be called ipv6.
+
+if IPV6
+
+config IPV6_ROUTER_PREF
+ bool "IPv6: Router Preference (RFC 4191) support"
+ ---help---
+ Router Preference is an optional extension to the Router
+ Advertisement message which improves the ability of hosts
+ to pick an appropriate router, especially when the hosts
+ are placed in a multi-homed network.
+
+ If unsure, say N.
+
+config IPV6_ROUTE_INFO
+ bool "IPv6: Route Information (RFC 4191) support"
+ depends on IPV6_ROUTER_PREF
+ ---help---
+ Support of Route Information.
+
+ If unsure, say N.
+
+config IPV6_OPTIMISTIC_DAD
+ bool "IPv6: Enable RFC 4429 Optimistic DAD"
+ ---help---
+ Support for optimistic Duplicate Address Detection. It allows for
+ autoconfigured addresses to be used more quickly.
+
+ If unsure, say N.
+
+config INET6_AH
+ tristate "IPv6: AH transformation"
+ select XFRM_ALGO
+ select CRYPTO
+ select CRYPTO_HMAC
+ select CRYPTO_MD5
+ select CRYPTO_SHA1
+ ---help---
+ Support for IPsec AH.
+
+ If unsure, say Y.
+
+config INET6_ESP
+ tristate "IPv6: ESP transformation"
+ select XFRM_ALGO
+ select CRYPTO
+ select CRYPTO_AUTHENC
+ select CRYPTO_HMAC
+ select CRYPTO_MD5
+ select CRYPTO_CBC
+ select CRYPTO_SHA1
+ select CRYPTO_DES
+ select CRYPTO_ECHAINIV
+ ---help---
+ Support for IPsec ESP.
+
+ If unsure, say Y.
+
+config INET6_ESP_OFFLOAD
+ tristate "IPv6: ESP transformation offload"
+ depends on INET6_ESP
+ select XFRM_OFFLOAD
+ default n
+ ---help---
+ Support for ESP transformation offload. This makes sense
+ only if this system really does IPsec and want to do it
+ with high throughput. A typical desktop system does not
+ need it, even if it does IPsec.
+
+ If unsure, say N.
+
+config INET6_IPCOMP
+ tristate "IPv6: IPComp transformation"
+ select INET6_XFRM_TUNNEL
+ select XFRM_IPCOMP
+ ---help---
+ Support for IP Payload Compression Protocol (IPComp) (RFC3173),
+ typically needed for IPsec.
+
+ If unsure, say Y.
+
+config IPV6_MIP6
+ tristate "IPv6: Mobility"
+ select XFRM
+ ---help---
+ Support for IPv6 Mobility described in RFC 3775.
+
+ If unsure, say N.
+
+config IPV6_ILA
+ tristate "IPv6: Identifier Locator Addressing (ILA)"
+ depends on NETFILTER
+ select DST_CACHE
+ select LWTUNNEL
+ ---help---
+ Support for IPv6 Identifier Locator Addressing (ILA).
+
+ ILA is a mechanism to do network virtualization without
+ encapsulation. The basic concept of ILA is that we split an
+ IPv6 address into a 64 bit locator and 64 bit identifier. The
+ identifier is the identity of an entity in communication
+ ("who") and the locator expresses the location of the
+ entity ("where").
+
+ ILA can be configured using the "encap ila" option with
+ "ip -6 route" command. ILA is described in
+ https://tools.ietf.org/html/draft-herbert-nvo3-ila-00.
+
+ If unsure, say N.
+
+config INET6_XFRM_TUNNEL
+ tristate
+ select INET6_TUNNEL
+ default n
+
+config INET6_TUNNEL
+ tristate
+ default n
+
+config INET6_XFRM_MODE_TRANSPORT
+ tristate "IPv6: IPsec transport mode"
+ default IPV6
+ select XFRM
+ ---help---
+ Support for IPsec transport mode.
+
+ If unsure, say Y.
+
+config INET6_XFRM_MODE_TUNNEL
+ tristate "IPv6: IPsec tunnel mode"
+ default IPV6
+ select XFRM
+ ---help---
+ Support for IPsec tunnel mode.
+
+ If unsure, say Y.
+
+config INET6_XFRM_MODE_BEET
+ tristate "IPv6: IPsec BEET mode"
+ default IPV6
+ select XFRM
+ ---help---
+ Support for IPsec BEET mode.
+
+ If unsure, say Y.
+
+config INET6_XFRM_MODE_ROUTEOPTIMIZATION
+ tristate "IPv6: MIPv6 route optimization mode"
+ select XFRM
+ ---help---
+ Support for MIPv6 route optimization mode.
+
+config IPV6_VTI
+tristate "Virtual (secure) IPv6: tunneling"
+ select IPV6_TUNNEL
+ select NET_IP_TUNNEL
+ depends on INET6_XFRM_MODE_TUNNEL
+ ---help---
+ Tunneling means encapsulating data of one protocol type within
+ another protocol and sending it over a channel that understands the
+ encapsulating protocol. This can be used with xfrm mode tunnel to give
+ the notion of a secure tunnel for IPSEC and then use routing protocol
+ on top.
+
+config IPV6_SIT
+ tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)"
+ select INET_TUNNEL
+ select NET_IP_TUNNEL
+ select IPV6_NDISC_NODETYPE
+ default y
+ ---help---
+ Tunneling means encapsulating data of one protocol type within
+ another protocol and sending it over a channel that understands the
+ encapsulating protocol. This driver implements encapsulation of IPv6
+ into IPv4 packets. This is useful if you want to connect two IPv6
+ networks over an IPv4-only path.
+
+ Saying M here will produce a module called sit. If unsure, say Y.
+
+config IPV6_SIT_6RD
+ bool "IPv6: IPv6 Rapid Deployment (6RD)"
+ depends on IPV6_SIT
+ default n
+ ---help---
+ IPv6 Rapid Deployment (6rd; draft-ietf-softwire-ipv6-6rd) builds upon
+ mechanisms of 6to4 (RFC3056) to enable a service provider to rapidly
+ deploy IPv6 unicast service to IPv4 sites to which it provides
+ customer premise equipment. Like 6to4, it utilizes stateless IPv6 in
+ IPv4 encapsulation in order to transit IPv4-only network
+ infrastructure. Unlike 6to4, a 6rd service provider uses an IPv6
+ prefix of its own in place of the fixed 6to4 prefix.
+
+ With this option enabled, the SIT driver offers 6rd functionality by
+ providing additional ioctl API to configure the IPv6 Prefix for in
+ stead of static 2002::/16 for 6to4.
+
+ If unsure, say N.
+
+config IPV6_NDISC_NODETYPE
+ bool
+
+config IPV6_TUNNEL
+ tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)"
+ select INET6_TUNNEL
+ select DST_CACHE
+ select GRO_CELLS
+ ---help---
+ Support for IPv6-in-IPv6 and IPv4-in-IPv6 tunnels described in
+ RFC 2473.
+
+ If unsure, say N.
+
+config IPV6_GRE
+ tristate "IPv6: GRE tunnel"
+ select IPV6_TUNNEL
+ select NET_IP_TUNNEL
+ depends on NET_IPGRE_DEMUX
+ ---help---
+ Tunneling means encapsulating data of one protocol type within
+ another protocol and sending it over a channel that understands the
+ encapsulating protocol. This particular tunneling driver implements
+ GRE (Generic Routing Encapsulation) and at this time allows
+ encapsulating of IPv4 or IPv6 over existing IPv6 infrastructure.
+ This driver is useful if the other endpoint is a Cisco router: Cisco
+ likes GRE much better than the other Linux tunneling driver ("IP
+ tunneling" above). In addition, GRE allows multicast redistribution
+ through the tunnel.
+
+ Saying M here will produce a module called ip6_gre. If unsure, say N.
+
+config IPV6_FOU
+ tristate
+ default NET_FOU && IPV6
+
+config IPV6_FOU_TUNNEL
+ tristate
+ default NET_FOU_IP_TUNNELS && IPV6_FOU
+ select IPV6_TUNNEL
+
+config IPV6_MULTIPLE_TABLES
+ bool "IPv6: Multiple Routing Tables"
+ select FIB_RULES
+ ---help---
+ Support multiple routing tables.
+
+config IPV6_SUBTREES
+ bool "IPv6: source address based routing"
+ depends on IPV6_MULTIPLE_TABLES
+ ---help---
+ Enable routing by source address or prefix.
+
+ The destination address is still the primary routing key, so mixing
+ normal and source prefix specific routes in the same routing table
+ may sometimes lead to unintended routing behavior. This can be
+ avoided by defining different routing tables for the normal and
+ source prefix specific routes.
+
+ If unsure, say N.
+
+config IPV6_MROUTE
+ bool "IPv6: multicast routing"
+ depends on IPV6
+ select IP_MROUTE_COMMON
+ ---help---
+ Support for IPv6 multicast forwarding.
+ If unsure, say N.
+
+config IPV6_MROUTE_MULTIPLE_TABLES
+ bool "IPv6: multicast policy routing"
+ depends on IPV6_MROUTE
+ select FIB_RULES
+ help
+ Normally, a multicast router runs a userspace daemon and decides
+ what to do with a multicast packet based on the source and
+ destination addresses. If you say Y here, the multicast router
+ will also be able to take interfaces and packet marks into
+ account and run multiple instances of userspace daemons
+ simultaneously, each one handling a single table.
+
+ If unsure, say N.
+
+config IPV6_PIMSM_V2
+ bool "IPv6: PIM-SM version 2 support"
+ depends on IPV6_MROUTE
+ ---help---
+ Support for IPv6 PIM multicast routing protocol PIM-SMv2.
+ If unsure, say N.
+
+config IPV6_SEG6_LWTUNNEL
+ bool "IPv6: Segment Routing Header encapsulation support"
+ depends on IPV6
+ select LWTUNNEL
+ select DST_CACHE
+ select IPV6_MULTIPLE_TABLES
+ ---help---
+ Support for encapsulation of packets within an outer IPv6
+ header and a Segment Routing Header using the lightweight
+ tunnels mechanism. Also enable support for advanced local
+ processing of SRv6 packets based on their active segment.
+
+ If unsure, say N.
+
+config IPV6_SEG6_HMAC
+ bool "IPv6: Segment Routing HMAC support"
+ depends on IPV6
+ select CRYPTO_HMAC
+ select CRYPTO_SHA1
+ select CRYPTO_SHA256
+ ---help---
+ Support for HMAC signature generation and verification
+ of SR-enabled packets.
+
+ If unsure, say N.
+
+config IPV6_SEG6_BPF
+ def_bool y
+ depends on IPV6_SEG6_LWTUNNEL
+ depends on IPV6 = y
+
+endif # IPV6
diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
new file mode 100644
index 0000000..e0026fa
--- /dev/null
+++ b/net/ipv6/Makefile
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux TCP/IP (INET6) layer.
+#
+
+obj-$(CONFIG_IPV6) += ipv6.o
+
+ipv6-objs := af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \
+ addrlabel.o \
+ route.o ip6_fib.o ipv6_sockglue.o ndisc.o udp.o udplite.o \
+ raw.o icmp.o mcast.o reassembly.o tcp_ipv6.o ping.o \
+ exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o \
+ udp_offload.o seg6.o fib6_notifier.o
+
+ipv6-offload := ip6_offload.o tcpv6_offload.o exthdrs_offload.o
+
+ipv6-$(CONFIG_SYSCTL) = sysctl_net_ipv6.o
+ipv6-$(CONFIG_IPV6_MROUTE) += ip6mr.o
+
+ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \
+ xfrm6_output.o xfrm6_protocol.o
+ipv6-$(CONFIG_NETFILTER) += netfilter.o
+ipv6-$(CONFIG_IPV6_MULTIPLE_TABLES) += fib6_rules.o
+ipv6-$(CONFIG_PROC_FS) += proc.o
+ipv6-$(CONFIG_SYN_COOKIES) += syncookies.o
+ipv6-$(CONFIG_NETLABEL) += calipso.o
+ipv6-$(CONFIG_IPV6_SEG6_LWTUNNEL) += seg6_iptunnel.o seg6_local.o
+ipv6-$(CONFIG_IPV6_SEG6_HMAC) += seg6_hmac.o
+
+ipv6-objs += $(ipv6-y)
+
+obj-$(CONFIG_INET6_AH) += ah6.o
+obj-$(CONFIG_INET6_ESP) += esp6.o
+obj-$(CONFIG_INET6_ESP_OFFLOAD) += esp6_offload.o
+obj-$(CONFIG_INET6_IPCOMP) += ipcomp6.o
+obj-$(CONFIG_INET6_XFRM_TUNNEL) += xfrm6_tunnel.o
+obj-$(CONFIG_INET6_TUNNEL) += tunnel6.o
+obj-$(CONFIG_INET6_XFRM_MODE_TRANSPORT) += xfrm6_mode_transport.o
+obj-$(CONFIG_INET6_XFRM_MODE_TUNNEL) += xfrm6_mode_tunnel.o
+obj-$(CONFIG_INET6_XFRM_MODE_ROUTEOPTIMIZATION) += xfrm6_mode_ro.o
+obj-$(CONFIG_INET6_XFRM_MODE_BEET) += xfrm6_mode_beet.o
+obj-$(CONFIG_IPV6_MIP6) += mip6.o
+obj-$(CONFIG_IPV6_ILA) += ila/
+obj-$(CONFIG_NETFILTER) += netfilter/
+
+obj-$(CONFIG_IPV6_VTI) += ip6_vti.o
+obj-$(CONFIG_IPV6_SIT) += sit.o
+obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o
+obj-$(CONFIG_IPV6_GRE) += ip6_gre.o
+obj-$(CONFIG_IPV6_FOU) += fou6.o
+
+obj-y += addrconf_core.o exthdrs_core.o ip6_checksum.o ip6_icmp.o
+obj-$(CONFIG_INET) += output_core.o protocol.o $(ipv6-offload)
+
+obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o
+
+ifneq ($(CONFIG_IPV6),)
+obj-$(CONFIG_NET_UDP_TUNNEL) += ip6_udp_tunnel.o
+obj-y += mcast_snoop.o
+endif
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
new file mode 100644
index 0000000..4e81ff2
--- /dev/null
+++ b/net/ipv6/addrconf.c
@@ -0,0 +1,6838 @@
+/*
+ * IPv6 Address [auto]configuration
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * Changes:
+ *
+ * Janos Farkas : delete timer on ifdown
+ * <chexum@bankinf.banki.hu>
+ * Andi Kleen : kill double kfree on module
+ * unload.
+ * Maciej W. Rozycki : FDDI support
+ * sekiya@USAGI : Don't send too many RS
+ * packets.
+ * yoshfuji@USAGI : Fixed interval between DAD
+ * packets.
+ * YOSHIFUJI Hideaki @USAGI : improved accuracy of
+ * address validation timer.
+ * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
+ * support.
+ * Yuji SEKIYA @USAGI : Don't assign a same IPv6
+ * address on a same interface.
+ * YOSHIFUJI Hideaki @USAGI : ARCnet support
+ * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
+ * seq_file.
+ * YOSHIFUJI Hideaki @USAGI : improved source address
+ * selection; consider scope,
+ * status etc.
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched/signal.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/inet.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_addr.h>
+#include <linux/if_arp.h>
+#include <linux/if_arcnet.h>
+#include <linux/if_infiniband.h>
+#include <linux/route.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+#include <linux/capability.h>
+#include <linux/delay.h>
+#include <linux/notifier.h>
+#include <linux/string.h>
+#include <linux/hash.h>
+
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/6lowpan.h>
+#include <net/firewire.h>
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/ndisc.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/tcp.h>
+#include <net/ip.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <net/l3mdev.h>
+#include <linux/if_tunnel.h>
+#include <linux/rtnetlink.h>
+#include <linux/netconf.h>
+#include <linux/random.h>
+#include <linux/uaccess.h>
+#include <asm/unaligned.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/export.h>
+
+#define INFINITY_LIFE_TIME 0xFFFFFFFF
+
+#define IPV6_MAX_STRLEN \
+ sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
+
+static inline u32 cstamp_delta(unsigned long cstamp)
+{
+ return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
+}
+
+static inline s32 rfc3315_s14_backoff_init(s32 irt)
+{
+ /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
+ u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
+ do_div(tmp, 1000000);
+ return (s32)tmp;
+}
+
+static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
+{
+ /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
+ u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
+ do_div(tmp, 1000000);
+ if ((s32)tmp > mrt) {
+ /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
+ tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
+ do_div(tmp, 1000000);
+ }
+ return (s32)tmp;
+}
+
+#ifdef CONFIG_SYSCTL
+static int addrconf_sysctl_register(struct inet6_dev *idev);
+static void addrconf_sysctl_unregister(struct inet6_dev *idev);
+#else
+static inline int addrconf_sysctl_register(struct inet6_dev *idev)
+{
+ return 0;
+}
+
+static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
+{
+}
+#endif
+
+static void ipv6_regen_rndid(struct inet6_dev *idev);
+static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
+
+static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
+static int ipv6_count_addresses(const struct inet6_dev *idev);
+static int ipv6_generate_stable_address(struct in6_addr *addr,
+ u8 dad_count,
+ const struct inet6_dev *idev);
+
+#define IN6_ADDR_HSIZE_SHIFT 8
+#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
+/*
+ * Configured unicast address hash table
+ */
+static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
+static DEFINE_SPINLOCK(addrconf_hash_lock);
+
+static void addrconf_verify(void);
+static void addrconf_verify_rtnl(void);
+static void addrconf_verify_work(struct work_struct *);
+
+static struct workqueue_struct *addrconf_wq;
+static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
+
+static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
+static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
+
+static void addrconf_type_change(struct net_device *dev,
+ unsigned long event);
+static int addrconf_ifdown(struct net_device *dev, int how);
+
+static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
+ int plen,
+ const struct net_device *dev,
+ u32 flags, u32 noflags);
+
+static void addrconf_dad_start(struct inet6_ifaddr *ifp);
+static void addrconf_dad_work(struct work_struct *w);
+static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
+ bool send_na);
+static void addrconf_dad_run(struct inet6_dev *idev);
+static void addrconf_rs_timer(struct timer_list *t);
+static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
+static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
+
+static void inet6_prefix_notify(int event, struct inet6_dev *idev,
+ struct prefix_info *pinfo);
+
+static struct ipv6_devconf ipv6_devconf __read_mostly = {
+ .forwarding = 0,
+ .hop_limit = IPV6_DEFAULT_HOPLIMIT,
+ .mtu6 = IPV6_MIN_MTU,
+ .accept_ra = 1,
+ .accept_redirects = 1,
+ .autoconf = 1,
+ .force_mld_version = 0,
+ .mldv1_unsolicited_report_interval = 10 * HZ,
+ .mldv2_unsolicited_report_interval = HZ,
+ .dad_transmits = 1,
+ .rtr_solicits = MAX_RTR_SOLICITATIONS,
+ .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
+ .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
+ .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
+ .use_tempaddr = 0,
+ .temp_valid_lft = TEMP_VALID_LIFETIME,
+ .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
+ .regen_max_retry = REGEN_MAX_RETRY,
+ .max_desync_factor = MAX_DESYNC_FACTOR,
+ .max_addresses = IPV6_MAX_ADDRESSES,
+ .accept_ra_defrtr = 1,
+ .accept_ra_from_local = 0,
+ .accept_ra_min_hop_limit= 1,
+ .accept_ra_pinfo = 1,
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ .accept_ra_rtr_pref = 1,
+ .rtr_probe_interval = 60 * HZ,
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ .accept_ra_rt_info_min_plen = 0,
+ .accept_ra_rt_info_max_plen = 0,
+#endif
+#endif
+ .proxy_ndp = 0,
+ .accept_source_route = 0, /* we do not accept RH0 by default. */
+ .disable_ipv6 = 0,
+ .accept_dad = 0,
+ .suppress_frag_ndisc = 1,
+ .accept_ra_mtu = 1,
+ .stable_secret = {
+ .initialized = false,
+ },
+ .use_oif_addrs_only = 0,
+ .ignore_routes_with_linkdown = 0,
+ .keep_addr_on_down = 0,
+ .seg6_enabled = 0,
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ .seg6_require_hmac = 0,
+#endif
+ .enhanced_dad = 1,
+ .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
+ .disable_policy = 0,
+};
+
+static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
+ .forwarding = 0,
+ .hop_limit = IPV6_DEFAULT_HOPLIMIT,
+ .mtu6 = IPV6_MIN_MTU,
+ .accept_ra = 1,
+ .accept_redirects = 1,
+ .autoconf = 1,
+ .force_mld_version = 0,
+ .mldv1_unsolicited_report_interval = 10 * HZ,
+ .mldv2_unsolicited_report_interval = HZ,
+ .dad_transmits = 1,
+ .rtr_solicits = MAX_RTR_SOLICITATIONS,
+ .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
+ .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
+ .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
+ .use_tempaddr = 0,
+ .temp_valid_lft = TEMP_VALID_LIFETIME,
+ .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
+ .regen_max_retry = REGEN_MAX_RETRY,
+ .max_desync_factor = MAX_DESYNC_FACTOR,
+ .max_addresses = IPV6_MAX_ADDRESSES,
+ .accept_ra_defrtr = 1,
+ .accept_ra_from_local = 0,
+ .accept_ra_min_hop_limit= 1,
+ .accept_ra_pinfo = 1,
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ .accept_ra_rtr_pref = 1,
+ .rtr_probe_interval = 60 * HZ,
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ .accept_ra_rt_info_min_plen = 0,
+ .accept_ra_rt_info_max_plen = 0,
+#endif
+#endif
+ .proxy_ndp = 0,
+ .accept_source_route = 0, /* we do not accept RH0 by default. */
+ .disable_ipv6 = 0,
+ .accept_dad = 1,
+ .suppress_frag_ndisc = 1,
+ .accept_ra_mtu = 1,
+ .stable_secret = {
+ .initialized = false,
+ },
+ .use_oif_addrs_only = 0,
+ .ignore_routes_with_linkdown = 0,
+ .keep_addr_on_down = 0,
+ .seg6_enabled = 0,
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ .seg6_require_hmac = 0,
+#endif
+ .enhanced_dad = 1,
+ .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
+ .disable_policy = 0,
+};
+
+/* Check if link is ready: is it up and is a valid qdisc available */
+static inline bool addrconf_link_ready(const struct net_device *dev)
+{
+ return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
+}
+
+static void addrconf_del_rs_timer(struct inet6_dev *idev)
+{
+ if (del_timer(&idev->rs_timer))
+ __in6_dev_put(idev);
+}
+
+static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
+{
+ if (cancel_delayed_work(&ifp->dad_work))
+ __in6_ifa_put(ifp);
+}
+
+static void addrconf_mod_rs_timer(struct inet6_dev *idev,
+ unsigned long when)
+{
+ if (!timer_pending(&idev->rs_timer))
+ in6_dev_hold(idev);
+ mod_timer(&idev->rs_timer, jiffies + when);
+}
+
+static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
+ unsigned long delay)
+{
+ in6_ifa_hold(ifp);
+ if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
+ in6_ifa_put(ifp);
+}
+
+static int snmp6_alloc_dev(struct inet6_dev *idev)
+{
+ int i;
+
+ idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
+ if (!idev->stats.ipv6)
+ goto err_ip;
+
+ for_each_possible_cpu(i) {
+ struct ipstats_mib *addrconf_stats;
+ addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
+ u64_stats_init(&addrconf_stats->syncp);
+ }
+
+
+ idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
+ GFP_KERNEL);
+ if (!idev->stats.icmpv6dev)
+ goto err_icmp;
+ idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
+ GFP_KERNEL);
+ if (!idev->stats.icmpv6msgdev)
+ goto err_icmpmsg;
+
+ return 0;
+
+err_icmpmsg:
+ kfree(idev->stats.icmpv6dev);
+err_icmp:
+ free_percpu(idev->stats.ipv6);
+err_ip:
+ return -ENOMEM;
+}
+
+static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
+{
+ struct inet6_dev *ndev;
+ int err = -ENOMEM;
+
+ ASSERT_RTNL();
+
+ if (dev->mtu < IPV6_MIN_MTU)
+ return ERR_PTR(-EINVAL);
+
+ ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
+ if (!ndev)
+ return ERR_PTR(err);
+
+ rwlock_init(&ndev->lock);
+ ndev->dev = dev;
+ INIT_LIST_HEAD(&ndev->addr_list);
+ timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
+ memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
+
+ if (ndev->cnf.stable_secret.initialized)
+ ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
+
+ ndev->cnf.mtu6 = dev->mtu;
+ ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
+ if (!ndev->nd_parms) {
+ kfree(ndev);
+ return ERR_PTR(err);
+ }
+ if (ndev->cnf.forwarding)
+ dev_disable_lro(dev);
+ /* We refer to the device */
+ dev_hold(dev);
+
+ if (snmp6_alloc_dev(ndev) < 0) {
+ netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
+ __func__);
+ neigh_parms_release(&nd_tbl, ndev->nd_parms);
+ dev_put(dev);
+ kfree(ndev);
+ return ERR_PTR(err);
+ }
+
+ if (snmp6_register_dev(ndev) < 0) {
+ netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
+ __func__, dev->name);
+ goto err_release;
+ }
+
+ /* One reference from device. */
+ refcount_set(&ndev->refcnt, 1);
+
+ if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
+ ndev->cnf.accept_dad = -1;
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+ if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
+ pr_info("%s: Disabled Multicast RS\n", dev->name);
+ ndev->cnf.rtr_solicits = 0;
+ }
+#endif
+
+ INIT_LIST_HEAD(&ndev->tempaddr_list);
+ ndev->desync_factor = U32_MAX;
+ if ((dev->flags&IFF_LOOPBACK) ||
+ dev->type == ARPHRD_TUNNEL ||
+ dev->type == ARPHRD_TUNNEL6 ||
+ dev->type == ARPHRD_SIT ||
+ dev->type == ARPHRD_NONE) {
+ ndev->cnf.use_tempaddr = -1;
+ } else
+ ipv6_regen_rndid(ndev);
+
+ ndev->token = in6addr_any;
+
+ if (netif_running(dev) && addrconf_link_ready(dev))
+ ndev->if_flags |= IF_READY;
+
+ ipv6_mc_init_dev(ndev);
+ ndev->tstamp = jiffies;
+ err = addrconf_sysctl_register(ndev);
+ if (err) {
+ ipv6_mc_destroy_dev(ndev);
+ snmp6_unregister_dev(ndev);
+ goto err_release;
+ }
+ /* protected by rtnl_lock */
+ rcu_assign_pointer(dev->ip6_ptr, ndev);
+
+ /* Join interface-local all-node multicast group */
+ ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
+
+ /* Join all-node multicast group */
+ ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
+
+ /* Join all-router multicast group if forwarding is set */
+ if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
+ ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
+
+ return ndev;
+
+err_release:
+ neigh_parms_release(&nd_tbl, ndev->nd_parms);
+ ndev->dead = 1;
+ in6_dev_finish_destroy(ndev);
+ return ERR_PTR(err);
+}
+
+static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ idev = __in6_dev_get(dev);
+ if (!idev) {
+ idev = ipv6_add_dev(dev);
+ if (IS_ERR(idev))
+ return NULL;
+ }
+
+ if (dev->flags&IFF_UP)
+ ipv6_mc_up(idev);
+ return idev;
+}
+
+static int inet6_netconf_msgsize_devconf(int type)
+{
+ int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
+ + nla_total_size(4); /* NETCONFA_IFINDEX */
+ bool all = false;
+
+ if (type == NETCONFA_ALL)
+ all = true;
+
+ if (all || type == NETCONFA_FORWARDING)
+ size += nla_total_size(4);
+#ifdef CONFIG_IPV6_MROUTE
+ if (all || type == NETCONFA_MC_FORWARDING)
+ size += nla_total_size(4);
+#endif
+ if (all || type == NETCONFA_PROXY_NEIGH)
+ size += nla_total_size(4);
+
+ if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
+ size += nla_total_size(4);
+
+ return size;
+}
+
+static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
+ struct ipv6_devconf *devconf, u32 portid,
+ u32 seq, int event, unsigned int flags,
+ int type)
+{
+ struct nlmsghdr *nlh;
+ struct netconfmsg *ncm;
+ bool all = false;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
+ flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ if (type == NETCONFA_ALL)
+ all = true;
+
+ ncm = nlmsg_data(nlh);
+ ncm->ncm_family = AF_INET6;
+
+ if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
+ goto nla_put_failure;
+
+ if (!devconf)
+ goto out;
+
+ if ((all || type == NETCONFA_FORWARDING) &&
+ nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
+ goto nla_put_failure;
+#ifdef CONFIG_IPV6_MROUTE
+ if ((all || type == NETCONFA_MC_FORWARDING) &&
+ nla_put_s32(skb, NETCONFA_MC_FORWARDING,
+ devconf->mc_forwarding) < 0)
+ goto nla_put_failure;
+#endif
+ if ((all || type == NETCONFA_PROXY_NEIGH) &&
+ nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
+ goto nla_put_failure;
+
+ if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
+ nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+ devconf->ignore_routes_with_linkdown) < 0)
+ goto nla_put_failure;
+
+out:
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+void inet6_netconf_notify_devconf(struct net *net, int event, int type,
+ int ifindex, struct ipv6_devconf *devconf)
+{
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
+ if (!skb)
+ goto errout;
+
+ err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
+ event, 0, type);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
+ return;
+errout:
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
+}
+
+static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
+ [NETCONFA_IFINDEX] = { .len = sizeof(int) },
+ [NETCONFA_FORWARDING] = { .len = sizeof(int) },
+ [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
+ [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
+};
+
+static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
+ struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct nlattr *tb[NETCONFA_MAX+1];
+ struct inet6_dev *in6_dev = NULL;
+ struct net_device *dev = NULL;
+ struct netconfmsg *ncm;
+ struct sk_buff *skb;
+ struct ipv6_devconf *devconf;
+ int ifindex;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
+ devconf_ipv6_policy, extack);
+ if (err < 0)
+ return err;
+
+ if (!tb[NETCONFA_IFINDEX])
+ return -EINVAL;
+
+ err = -EINVAL;
+ ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
+ switch (ifindex) {
+ case NETCONFA_IFINDEX_ALL:
+ devconf = net->ipv6.devconf_all;
+ break;
+ case NETCONFA_IFINDEX_DEFAULT:
+ devconf = net->ipv6.devconf_dflt;
+ break;
+ default:
+ dev = dev_get_by_index(net, ifindex);
+ if (!dev)
+ return -EINVAL;
+ in6_dev = in6_dev_get(dev);
+ if (!in6_dev)
+ goto errout;
+ devconf = &in6_dev->cnf;
+ break;
+ }
+
+ err = -ENOBUFS;
+ skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
+ if (!skb)
+ goto errout;
+
+ err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
+ NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
+ NETCONFA_ALL);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+errout:
+ if (in6_dev)
+ in6_dev_put(in6_dev);
+ if (dev)
+ dev_put(dev);
+ return err;
+}
+
+static int inet6_netconf_dump_devconf(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ int h, s_h;
+ int idx, s_idx;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+ struct hlist_head *head;
+
+ s_h = cb->args[0];
+ s_idx = idx = cb->args[1];
+
+ for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+ idx = 0;
+ head = &net->dev_index_head[h];
+ rcu_read_lock();
+ cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
+ net->dev_base_seq;
+ hlist_for_each_entry_rcu(dev, head, index_hlist) {
+ if (idx < s_idx)
+ goto cont;
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ goto cont;
+
+ if (inet6_netconf_fill_devconf(skb, dev->ifindex,
+ &idev->cnf,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNETCONF,
+ NLM_F_MULTI,
+ NETCONFA_ALL) < 0) {
+ rcu_read_unlock();
+ goto done;
+ }
+ nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+cont:
+ idx++;
+ }
+ rcu_read_unlock();
+ }
+ if (h == NETDEV_HASHENTRIES) {
+ if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNETCONF, NLM_F_MULTI,
+ NETCONFA_ALL) < 0)
+ goto done;
+ else
+ h++;
+ }
+ if (h == NETDEV_HASHENTRIES + 1) {
+ if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
+ net->ipv6.devconf_dflt,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNETCONF, NLM_F_MULTI,
+ NETCONFA_ALL) < 0)
+ goto done;
+ else
+ h++;
+ }
+done:
+ cb->args[0] = h;
+ cb->args[1] = idx;
+
+ return skb->len;
+}
+
+#ifdef CONFIG_SYSCTL
+static void dev_forward_change(struct inet6_dev *idev)
+{
+ struct net_device *dev;
+ struct inet6_ifaddr *ifa;
+
+ if (!idev)
+ return;
+ dev = idev->dev;
+ if (idev->cnf.forwarding)
+ dev_disable_lro(dev);
+ if (dev->flags & IFF_MULTICAST) {
+ if (idev->cnf.forwarding) {
+ ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
+ ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
+ ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
+ } else {
+ ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
+ ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
+ ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
+ }
+ }
+
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ if (ifa->flags&IFA_F_TENTATIVE)
+ continue;
+ if (idev->cnf.forwarding)
+ addrconf_join_anycast(ifa);
+ else
+ addrconf_leave_anycast(ifa);
+ }
+ inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
+ NETCONFA_FORWARDING,
+ dev->ifindex, &idev->cnf);
+}
+
+
+static void addrconf_forward_change(struct net *net, __s32 newf)
+{
+ struct net_device *dev;
+ struct inet6_dev *idev;
+
+ for_each_netdev(net, dev) {
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ int changed = (!idev->cnf.forwarding) ^ (!newf);
+ idev->cnf.forwarding = newf;
+ if (changed)
+ dev_forward_change(idev);
+ }
+ }
+}
+
+static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
+{
+ struct net *net;
+ int old;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ net = (struct net *)table->extra2;
+ old = *p;
+ *p = newf;
+
+ if (p == &net->ipv6.devconf_dflt->forwarding) {
+ if ((!newf) ^ (!old))
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_FORWARDING,
+ NETCONFA_IFINDEX_DEFAULT,
+ net->ipv6.devconf_dflt);
+ rtnl_unlock();
+ return 0;
+ }
+
+ if (p == &net->ipv6.devconf_all->forwarding) {
+ int old_dflt = net->ipv6.devconf_dflt->forwarding;
+
+ net->ipv6.devconf_dflt->forwarding = newf;
+ if ((!newf) ^ (!old_dflt))
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_FORWARDING,
+ NETCONFA_IFINDEX_DEFAULT,
+ net->ipv6.devconf_dflt);
+
+ addrconf_forward_change(net, newf);
+ if ((!newf) ^ (!old))
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
+ } else if ((!newf) ^ (!old))
+ dev_forward_change((struct inet6_dev *)table->extra1);
+ rtnl_unlock();
+
+ if (newf)
+ rt6_purge_dflt_routers(net);
+ return 1;
+}
+
+static void addrconf_linkdown_change(struct net *net, __s32 newf)
+{
+ struct net_device *dev;
+ struct inet6_dev *idev;
+
+ for_each_netdev(net, dev) {
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
+
+ idev->cnf.ignore_routes_with_linkdown = newf;
+ if (changed)
+ inet6_netconf_notify_devconf(dev_net(dev),
+ RTM_NEWNETCONF,
+ NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+ dev->ifindex,
+ &idev->cnf);
+ }
+ }
+}
+
+static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
+{
+ struct net *net;
+ int old;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ net = (struct net *)table->extra2;
+ old = *p;
+ *p = newf;
+
+ if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
+ if ((!newf) ^ (!old))
+ inet6_netconf_notify_devconf(net,
+ RTM_NEWNETCONF,
+ NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+ NETCONFA_IFINDEX_DEFAULT,
+ net->ipv6.devconf_dflt);
+ rtnl_unlock();
+ return 0;
+ }
+
+ if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
+ net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
+ addrconf_linkdown_change(net, newf);
+ if ((!newf) ^ (!old))
+ inet6_netconf_notify_devconf(net,
+ RTM_NEWNETCONF,
+ NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
+ }
+ rtnl_unlock();
+
+ return 1;
+}
+
+#endif
+
+/* Nobody refers to this ifaddr, destroy it */
+void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
+{
+ WARN_ON(!hlist_unhashed(&ifp->addr_lst));
+
+#ifdef NET_REFCNT_DEBUG
+ pr_debug("%s\n", __func__);
+#endif
+
+ in6_dev_put(ifp->idev);
+
+ if (cancel_delayed_work(&ifp->dad_work))
+ pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
+ ifp);
+
+ if (ifp->state != INET6_IFADDR_STATE_DEAD) {
+ pr_warn("Freeing alive inet6 address %p\n", ifp);
+ return;
+ }
+
+ kfree_rcu(ifp, rcu);
+}
+
+static void
+ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
+{
+ struct list_head *p;
+ int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
+
+ /*
+ * Each device address list is sorted in order of scope -
+ * global before linklocal.
+ */
+ list_for_each(p, &idev->addr_list) {
+ struct inet6_ifaddr *ifa
+ = list_entry(p, struct inet6_ifaddr, if_list);
+ if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
+ break;
+ }
+
+ list_add_tail_rcu(&ifp->if_list, p);
+}
+
+static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
+{
+ u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
+
+ return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
+}
+
+static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
+ struct net_device *dev, unsigned int hash)
+{
+ struct inet6_ifaddr *ifp;
+
+ hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
+ if (!net_eq(dev_net(ifp->idev->dev), net))
+ continue;
+ if (ipv6_addr_equal(&ifp->addr, addr)) {
+ if (!dev || ifp->idev->dev == dev)
+ return true;
+ }
+ }
+ return false;
+}
+
+static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
+{
+ unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
+ int err = 0;
+
+ spin_lock(&addrconf_hash_lock);
+
+ /* Ignore adding duplicate addresses on an interface */
+ if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
+ netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
+ err = -EEXIST;
+ } else {
+ hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
+ }
+
+ spin_unlock(&addrconf_hash_lock);
+
+ return err;
+}
+
+/* On success it returns ifp with increased reference count */
+
+static struct inet6_ifaddr *
+ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
+ bool can_block, struct netlink_ext_ack *extack)
+{
+ gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
+ int addr_type = ipv6_addr_type(cfg->pfx);
+ struct net *net = dev_net(idev->dev);
+ struct inet6_ifaddr *ifa = NULL;
+ struct fib6_info *f6i = NULL;
+ int err = 0;
+
+ if (addr_type == IPV6_ADDR_ANY ||
+ addr_type & IPV6_ADDR_MULTICAST ||
+ (!(idev->dev->flags & IFF_LOOPBACK) &&
+ addr_type & IPV6_ADDR_LOOPBACK))
+ return ERR_PTR(-EADDRNOTAVAIL);
+
+ if (idev->dead) {
+ err = -ENODEV; /*XXX*/
+ goto out;
+ }
+
+ if (idev->cnf.disable_ipv6) {
+ err = -EACCES;
+ goto out;
+ }
+
+ /* validator notifier needs to be blocking;
+ * do not call in atomic context
+ */
+ if (can_block) {
+ struct in6_validator_info i6vi = {
+ .i6vi_addr = *cfg->pfx,
+ .i6vi_dev = idev,
+ .extack = extack,
+ };
+
+ err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
+ err = notifier_to_errno(err);
+ if (err < 0)
+ goto out;
+ }
+
+ ifa = kzalloc(sizeof(*ifa), gfp_flags);
+ if (!ifa) {
+ err = -ENOBUFS;
+ goto out;
+ }
+
+ f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
+ if (IS_ERR(f6i)) {
+ err = PTR_ERR(f6i);
+ f6i = NULL;
+ goto out;
+ }
+
+ if (net->ipv6.devconf_all->disable_policy ||
+ idev->cnf.disable_policy)
+ f6i->dst_nopolicy = true;
+
+ neigh_parms_data_state_setall(idev->nd_parms);
+
+ ifa->addr = *cfg->pfx;
+ if (cfg->peer_pfx)
+ ifa->peer_addr = *cfg->peer_pfx;
+
+ spin_lock_init(&ifa->lock);
+ INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
+ INIT_HLIST_NODE(&ifa->addr_lst);
+ ifa->scope = cfg->scope;
+ ifa->prefix_len = cfg->plen;
+ ifa->rt_priority = cfg->rt_priority;
+ ifa->flags = cfg->ifa_flags;
+ /* No need to add the TENTATIVE flag for addresses with NODAD */
+ if (!(cfg->ifa_flags & IFA_F_NODAD))
+ ifa->flags |= IFA_F_TENTATIVE;
+ ifa->valid_lft = cfg->valid_lft;
+ ifa->prefered_lft = cfg->preferred_lft;
+ ifa->cstamp = ifa->tstamp = jiffies;
+ ifa->tokenized = false;
+
+ ifa->rt = f6i;
+
+ ifa->idev = idev;
+ in6_dev_hold(idev);
+
+ /* For caller */
+ refcount_set(&ifa->refcnt, 1);
+
+ rcu_read_lock_bh();
+
+ err = ipv6_add_addr_hash(idev->dev, ifa);
+ if (err < 0) {
+ rcu_read_unlock_bh();
+ goto out;
+ }
+
+ write_lock(&idev->lock);
+
+ /* Add to inet6_dev unicast addr list. */
+ ipv6_link_dev_addr(idev, ifa);
+
+ if (ifa->flags&IFA_F_TEMPORARY) {
+ list_add(&ifa->tmp_list, &idev->tempaddr_list);
+ in6_ifa_hold(ifa);
+ }
+
+ in6_ifa_hold(ifa);
+ write_unlock(&idev->lock);
+
+ rcu_read_unlock_bh();
+
+ inet6addr_notifier_call_chain(NETDEV_UP, ifa);
+out:
+ if (unlikely(err < 0)) {
+ fib6_info_release(f6i);
+
+ if (ifa) {
+ if (ifa->idev)
+ in6_dev_put(ifa->idev);
+ kfree(ifa);
+ }
+ ifa = ERR_PTR(err);
+ }
+
+ return ifa;
+}
+
+enum cleanup_prefix_rt_t {
+ CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
+ CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
+ CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
+};
+
+/*
+ * Check, whether the prefix for ifp would still need a prefix route
+ * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
+ * constants.
+ *
+ * 1) we don't purge prefix if address was not permanent.
+ * prefix is managed by its own lifetime.
+ * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
+ * 3) if there are no addresses, delete prefix.
+ * 4) if there are still other permanent address(es),
+ * corresponding prefix is still permanent.
+ * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
+ * don't purge the prefix, assume user space is managing it.
+ * 6) otherwise, update prefix lifetime to the
+ * longest valid lifetime among the corresponding
+ * addresses on the device.
+ * Note: subsequent RA will update lifetime.
+ **/
+static enum cleanup_prefix_rt_t
+check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
+{
+ struct inet6_ifaddr *ifa;
+ struct inet6_dev *idev = ifp->idev;
+ unsigned long lifetime;
+ enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
+
+ *expires = jiffies;
+
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ if (ifa == ifp)
+ continue;
+ if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
+ ifp->prefix_len))
+ continue;
+ if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
+ return CLEANUP_PREFIX_RT_NOP;
+
+ action = CLEANUP_PREFIX_RT_EXPIRE;
+
+ spin_lock(&ifa->lock);
+
+ lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
+ /*
+ * Note: Because this address is
+ * not permanent, lifetime <
+ * LONG_MAX / HZ here.
+ */
+ if (time_before(*expires, ifa->tstamp + lifetime * HZ))
+ *expires = ifa->tstamp + lifetime * HZ;
+ spin_unlock(&ifa->lock);
+ }
+
+ return action;
+}
+
+static void
+cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
+{
+ struct fib6_info *f6i;
+
+ f6i = addrconf_get_prefix_route(&ifp->addr,
+ ifp->prefix_len,
+ ifp->idev->dev,
+ 0, RTF_GATEWAY | RTF_DEFAULT);
+ if (f6i) {
+ if (del_rt)
+ ip6_del_rt(dev_net(ifp->idev->dev), f6i);
+ else {
+ if (!(f6i->fib6_flags & RTF_EXPIRES))
+ fib6_set_expires(f6i, expires);
+ fib6_info_release(f6i);
+ }
+ }
+}
+
+
+/* This function wants to get referenced ifp and releases it before return */
+
+static void ipv6_del_addr(struct inet6_ifaddr *ifp)
+{
+ int state;
+ enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
+ unsigned long expires;
+
+ ASSERT_RTNL();
+
+ spin_lock_bh(&ifp->lock);
+ state = ifp->state;
+ ifp->state = INET6_IFADDR_STATE_DEAD;
+ spin_unlock_bh(&ifp->lock);
+
+ if (state == INET6_IFADDR_STATE_DEAD)
+ goto out;
+
+ spin_lock_bh(&addrconf_hash_lock);
+ hlist_del_init_rcu(&ifp->addr_lst);
+ spin_unlock_bh(&addrconf_hash_lock);
+
+ write_lock_bh(&ifp->idev->lock);
+
+ if (ifp->flags&IFA_F_TEMPORARY) {
+ list_del(&ifp->tmp_list);
+ if (ifp->ifpub) {
+ in6_ifa_put(ifp->ifpub);
+ ifp->ifpub = NULL;
+ }
+ __in6_ifa_put(ifp);
+ }
+
+ if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
+ action = check_cleanup_prefix_route(ifp, &expires);
+
+ list_del_rcu(&ifp->if_list);
+ __in6_ifa_put(ifp);
+
+ write_unlock_bh(&ifp->idev->lock);
+
+ addrconf_del_dad_work(ifp);
+
+ ipv6_ifa_notify(RTM_DELADDR, ifp);
+
+ inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
+
+ if (action != CLEANUP_PREFIX_RT_NOP) {
+ cleanup_prefix_route(ifp, expires,
+ action == CLEANUP_PREFIX_RT_DEL);
+ }
+
+ /* clean up prefsrc entries */
+ rt6_remove_prefsrc(ifp);
+out:
+ in6_ifa_put(ifp);
+}
+
+static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
+ struct inet6_ifaddr *ift,
+ bool block)
+{
+ struct inet6_dev *idev = ifp->idev;
+ struct in6_addr addr, *tmpaddr;
+ unsigned long tmp_tstamp, age;
+ unsigned long regen_advance;
+ struct ifa6_config cfg;
+ int ret = 0;
+ unsigned long now = jiffies;
+ long max_desync_factor;
+ s32 cnf_temp_preferred_lft;
+
+ write_lock_bh(&idev->lock);
+ if (ift) {
+ spin_lock_bh(&ift->lock);
+ memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
+ spin_unlock_bh(&ift->lock);
+ tmpaddr = &addr;
+ } else {
+ tmpaddr = NULL;
+ }
+retry:
+ in6_dev_hold(idev);
+ if (idev->cnf.use_tempaddr <= 0) {
+ write_unlock_bh(&idev->lock);
+ pr_info("%s: use_tempaddr is disabled\n", __func__);
+ in6_dev_put(idev);
+ ret = -1;
+ goto out;
+ }
+ spin_lock_bh(&ifp->lock);
+ if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
+ idev->cnf.use_tempaddr = -1; /*XXX*/
+ spin_unlock_bh(&ifp->lock);
+ write_unlock_bh(&idev->lock);
+ pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
+ __func__);
+ in6_dev_put(idev);
+ ret = -1;
+ goto out;
+ }
+ in6_ifa_hold(ifp);
+ memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
+ ipv6_try_regen_rndid(idev, tmpaddr);
+ memcpy(&addr.s6_addr[8], idev->rndid, 8);
+ age = (now - ifp->tstamp) / HZ;
+
+ regen_advance = idev->cnf.regen_max_retry *
+ idev->cnf.dad_transmits *
+ NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
+
+ /* recalculate max_desync_factor each time and update
+ * idev->desync_factor if it's larger
+ */
+ cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
+ max_desync_factor = min_t(__u32,
+ idev->cnf.max_desync_factor,
+ cnf_temp_preferred_lft - regen_advance);
+
+ if (unlikely(idev->desync_factor > max_desync_factor)) {
+ if (max_desync_factor > 0) {
+ get_random_bytes(&idev->desync_factor,
+ sizeof(idev->desync_factor));
+ idev->desync_factor %= max_desync_factor;
+ } else {
+ idev->desync_factor = 0;
+ }
+ }
+
+ memset(&cfg, 0, sizeof(cfg));
+ cfg.valid_lft = min_t(__u32, ifp->valid_lft,
+ idev->cnf.temp_valid_lft + age);
+ cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
+ cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
+
+ cfg.plen = ifp->prefix_len;
+ tmp_tstamp = ifp->tstamp;
+ spin_unlock_bh(&ifp->lock);
+
+ write_unlock_bh(&idev->lock);
+
+ /* A temporary address is created only if this calculated Preferred
+ * Lifetime is greater than REGEN_ADVANCE time units. In particular,
+ * an implementation must not create a temporary address with a zero
+ * Preferred Lifetime.
+ * Use age calculation as in addrconf_verify to avoid unnecessary
+ * temporary addresses being generated.
+ */
+ age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+ if (cfg.preferred_lft <= regen_advance + age) {
+ in6_ifa_put(ifp);
+ in6_dev_put(idev);
+ ret = -1;
+ goto out;
+ }
+
+ cfg.ifa_flags = IFA_F_TEMPORARY;
+ /* set in addrconf_prefix_rcv() */
+ if (ifp->flags & IFA_F_OPTIMISTIC)
+ cfg.ifa_flags |= IFA_F_OPTIMISTIC;
+
+ cfg.pfx = &addr;
+ cfg.scope = ipv6_addr_scope(cfg.pfx);
+
+ ift = ipv6_add_addr(idev, &cfg, block, NULL);
+ if (IS_ERR(ift)) {
+ in6_ifa_put(ifp);
+ in6_dev_put(idev);
+ pr_info("%s: retry temporary address regeneration\n", __func__);
+ tmpaddr = &addr;
+ write_lock_bh(&idev->lock);
+ goto retry;
+ }
+
+ spin_lock_bh(&ift->lock);
+ ift->ifpub = ifp;
+ ift->cstamp = now;
+ ift->tstamp = tmp_tstamp;
+ spin_unlock_bh(&ift->lock);
+
+ addrconf_dad_start(ift);
+ in6_ifa_put(ift);
+ in6_dev_put(idev);
+out:
+ return ret;
+}
+
+/*
+ * Choose an appropriate source address (RFC3484)
+ */
+enum {
+ IPV6_SADDR_RULE_INIT = 0,
+ IPV6_SADDR_RULE_LOCAL,
+ IPV6_SADDR_RULE_SCOPE,
+ IPV6_SADDR_RULE_PREFERRED,
+#ifdef CONFIG_IPV6_MIP6
+ IPV6_SADDR_RULE_HOA,
+#endif
+ IPV6_SADDR_RULE_OIF,
+ IPV6_SADDR_RULE_LABEL,
+ IPV6_SADDR_RULE_PRIVACY,
+ IPV6_SADDR_RULE_ORCHID,
+ IPV6_SADDR_RULE_PREFIX,
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ IPV6_SADDR_RULE_NOT_OPTIMISTIC,
+#endif
+ IPV6_SADDR_RULE_MAX
+};
+
+struct ipv6_saddr_score {
+ int rule;
+ int addr_type;
+ struct inet6_ifaddr *ifa;
+ DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
+ int scopedist;
+ int matchlen;
+};
+
+struct ipv6_saddr_dst {
+ const struct in6_addr *addr;
+ int ifindex;
+ int scope;
+ int label;
+ unsigned int prefs;
+};
+
+static inline int ipv6_saddr_preferred(int type)
+{
+ if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
+ return 1;
+ return 0;
+}
+
+static bool ipv6_use_optimistic_addr(struct net *net,
+ struct inet6_dev *idev)
+{
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ if (!idev)
+ return false;
+ if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
+ return false;
+ if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
+ return false;
+
+ return true;
+#else
+ return false;
+#endif
+}
+
+static bool ipv6_allow_optimistic_dad(struct net *net,
+ struct inet6_dev *idev)
+{
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ if (!idev)
+ return false;
+ if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
+ return false;
+
+ return true;
+#else
+ return false;
+#endif
+}
+
+static int ipv6_get_saddr_eval(struct net *net,
+ struct ipv6_saddr_score *score,
+ struct ipv6_saddr_dst *dst,
+ int i)
+{
+ int ret;
+
+ if (i <= score->rule) {
+ switch (i) {
+ case IPV6_SADDR_RULE_SCOPE:
+ ret = score->scopedist;
+ break;
+ case IPV6_SADDR_RULE_PREFIX:
+ ret = score->matchlen;
+ break;
+ default:
+ ret = !!test_bit(i, score->scorebits);
+ }
+ goto out;
+ }
+
+ switch (i) {
+ case IPV6_SADDR_RULE_INIT:
+ /* Rule 0: remember if hiscore is not ready yet */
+ ret = !!score->ifa;
+ break;
+ case IPV6_SADDR_RULE_LOCAL:
+ /* Rule 1: Prefer same address */
+ ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
+ break;
+ case IPV6_SADDR_RULE_SCOPE:
+ /* Rule 2: Prefer appropriate scope
+ *
+ * ret
+ * ^
+ * -1 | d 15
+ * ---+--+-+---> scope
+ * |
+ * | d is scope of the destination.
+ * B-d | \
+ * | \ <- smaller scope is better if
+ * B-15 | \ if scope is enough for destination.
+ * | ret = B - scope (-1 <= scope >= d <= 15).
+ * d-C-1 | /
+ * |/ <- greater is better
+ * -C / if scope is not enough for destination.
+ * /| ret = scope - C (-1 <= d < scope <= 15).
+ *
+ * d - C - 1 < B -15 (for all -1 <= d <= 15).
+ * C > d + 14 - B >= 15 + 14 - B = 29 - B.
+ * Assume B = 0 and we get C > 29.
+ */
+ ret = __ipv6_addr_src_scope(score->addr_type);
+ if (ret >= dst->scope)
+ ret = -ret;
+ else
+ ret -= 128; /* 30 is enough */
+ score->scopedist = ret;
+ break;
+ case IPV6_SADDR_RULE_PREFERRED:
+ {
+ /* Rule 3: Avoid deprecated and optimistic addresses */
+ u8 avoid = IFA_F_DEPRECATED;
+
+ if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
+ avoid |= IFA_F_OPTIMISTIC;
+ ret = ipv6_saddr_preferred(score->addr_type) ||
+ !(score->ifa->flags & avoid);
+ break;
+ }
+#ifdef CONFIG_IPV6_MIP6
+ case IPV6_SADDR_RULE_HOA:
+ {
+ /* Rule 4: Prefer home address */
+ int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
+ ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
+ break;
+ }
+#endif
+ case IPV6_SADDR_RULE_OIF:
+ /* Rule 5: Prefer outgoing interface */
+ ret = (!dst->ifindex ||
+ dst->ifindex == score->ifa->idev->dev->ifindex);
+ break;
+ case IPV6_SADDR_RULE_LABEL:
+ /* Rule 6: Prefer matching label */
+ ret = ipv6_addr_label(net,
+ &score->ifa->addr, score->addr_type,
+ score->ifa->idev->dev->ifindex) == dst->label;
+ break;
+ case IPV6_SADDR_RULE_PRIVACY:
+ {
+ /* Rule 7: Prefer public address
+ * Note: prefer temporary address if use_tempaddr >= 2
+ */
+ int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
+ !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
+ score->ifa->idev->cnf.use_tempaddr >= 2;
+ ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
+ break;
+ }
+ case IPV6_SADDR_RULE_ORCHID:
+ /* Rule 8-: Prefer ORCHID vs ORCHID or
+ * non-ORCHID vs non-ORCHID
+ */
+ ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
+ ipv6_addr_orchid(dst->addr));
+ break;
+ case IPV6_SADDR_RULE_PREFIX:
+ /* Rule 8: Use longest matching prefix */
+ ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
+ if (ret > score->ifa->prefix_len)
+ ret = score->ifa->prefix_len;
+ score->matchlen = ret;
+ break;
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
+ /* Optimistic addresses still have lower precedence than other
+ * preferred addresses.
+ */
+ ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
+ break;
+#endif
+ default:
+ ret = 0;
+ }
+
+ if (ret)
+ __set_bit(i, score->scorebits);
+ score->rule = i;
+out:
+ return ret;
+}
+
+static int __ipv6_dev_get_saddr(struct net *net,
+ struct ipv6_saddr_dst *dst,
+ struct inet6_dev *idev,
+ struct ipv6_saddr_score *scores,
+ int hiscore_idx)
+{
+ struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
+
+ list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
+ int i;
+
+ /*
+ * - Tentative Address (RFC2462 section 5.4)
+ * - A tentative address is not considered
+ * "assigned to an interface" in the traditional
+ * sense, unless it is also flagged as optimistic.
+ * - Candidate Source Address (section 4)
+ * - In any case, anycast addresses, multicast
+ * addresses, and the unspecified address MUST
+ * NOT be included in a candidate set.
+ */
+ if ((score->ifa->flags & IFA_F_TENTATIVE) &&
+ (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
+ continue;
+
+ score->addr_type = __ipv6_addr_type(&score->ifa->addr);
+
+ if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
+ score->addr_type & IPV6_ADDR_MULTICAST)) {
+ net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
+ idev->dev->name);
+ continue;
+ }
+
+ score->rule = -1;
+ bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
+
+ for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
+ int minihiscore, miniscore;
+
+ minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
+ miniscore = ipv6_get_saddr_eval(net, score, dst, i);
+
+ if (minihiscore > miniscore) {
+ if (i == IPV6_SADDR_RULE_SCOPE &&
+ score->scopedist > 0) {
+ /*
+ * special case:
+ * each remaining entry
+ * has too small (not enough)
+ * scope, because ifa entries
+ * are sorted by their scope
+ * values.
+ */
+ goto out;
+ }
+ break;
+ } else if (minihiscore < miniscore) {
+ swap(hiscore, score);
+ hiscore_idx = 1 - hiscore_idx;
+
+ /* restore our iterator */
+ score->ifa = hiscore->ifa;
+
+ break;
+ }
+ }
+ }
+out:
+ return hiscore_idx;
+}
+
+static int ipv6_get_saddr_master(struct net *net,
+ const struct net_device *dst_dev,
+ const struct net_device *master,
+ struct ipv6_saddr_dst *dst,
+ struct ipv6_saddr_score *scores,
+ int hiscore_idx)
+{
+ struct inet6_dev *idev;
+
+ idev = __in6_dev_get(dst_dev);
+ if (idev)
+ hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
+ scores, hiscore_idx);
+
+ idev = __in6_dev_get(master);
+ if (idev)
+ hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
+ scores, hiscore_idx);
+
+ return hiscore_idx;
+}
+
+int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
+ const struct in6_addr *daddr, unsigned int prefs,
+ struct in6_addr *saddr)
+{
+ struct ipv6_saddr_score scores[2], *hiscore;
+ struct ipv6_saddr_dst dst;
+ struct inet6_dev *idev;
+ struct net_device *dev;
+ int dst_type;
+ bool use_oif_addr = false;
+ int hiscore_idx = 0;
+ int ret = 0;
+
+ dst_type = __ipv6_addr_type(daddr);
+ dst.addr = daddr;
+ dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
+ dst.scope = __ipv6_addr_src_scope(dst_type);
+ dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
+ dst.prefs = prefs;
+
+ scores[hiscore_idx].rule = -1;
+ scores[hiscore_idx].ifa = NULL;
+
+ rcu_read_lock();
+
+ /* Candidate Source Address (section 4)
+ * - multicast and link-local destination address,
+ * the set of candidate source address MUST only
+ * include addresses assigned to interfaces
+ * belonging to the same link as the outgoing
+ * interface.
+ * (- For site-local destination addresses, the
+ * set of candidate source addresses MUST only
+ * include addresses assigned to interfaces
+ * belonging to the same site as the outgoing
+ * interface.)
+ * - "It is RECOMMENDED that the candidate source addresses
+ * be the set of unicast addresses assigned to the
+ * interface that will be used to send to the destination
+ * (the 'outgoing' interface)." (RFC 6724)
+ */
+ if (dst_dev) {
+ idev = __in6_dev_get(dst_dev);
+ if ((dst_type & IPV6_ADDR_MULTICAST) ||
+ dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
+ (idev && idev->cnf.use_oif_addrs_only)) {
+ use_oif_addr = true;
+ }
+ }
+
+ if (use_oif_addr) {
+ if (idev)
+ hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
+ } else {
+ const struct net_device *master;
+ int master_idx = 0;
+
+ /* if dst_dev exists and is enslaved to an L3 device, then
+ * prefer addresses from dst_dev and then the master over
+ * any other enslaved devices in the L3 domain.
+ */
+ master = l3mdev_master_dev_rcu(dst_dev);
+ if (master) {
+ master_idx = master->ifindex;
+
+ hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
+ master, &dst,
+ scores, hiscore_idx);
+
+ if (scores[hiscore_idx].ifa)
+ goto out;
+ }
+
+ for_each_netdev_rcu(net, dev) {
+ /* only consider addresses on devices in the
+ * same L3 domain
+ */
+ if (l3mdev_master_ifindex_rcu(dev) != master_idx)
+ continue;
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ continue;
+ hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
+ }
+ }
+
+out:
+ hiscore = &scores[hiscore_idx];
+ if (!hiscore->ifa)
+ ret = -EADDRNOTAVAIL;
+ else
+ *saddr = hiscore->ifa->addr;
+
+ rcu_read_unlock();
+ return ret;
+}
+EXPORT_SYMBOL(ipv6_dev_get_saddr);
+
+int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
+ u32 banned_flags)
+{
+ struct inet6_ifaddr *ifp;
+ int err = -EADDRNOTAVAIL;
+
+ list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
+ if (ifp->scope > IFA_LINK)
+ break;
+ if (ifp->scope == IFA_LINK &&
+ !(ifp->flags & banned_flags)) {
+ *addr = ifp->addr;
+ err = 0;
+ break;
+ }
+ }
+ return err;
+}
+
+int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
+ u32 banned_flags)
+{
+ struct inet6_dev *idev;
+ int err = -EADDRNOTAVAIL;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ read_lock_bh(&idev->lock);
+ err = __ipv6_get_lladdr(idev, addr, banned_flags);
+ read_unlock_bh(&idev->lock);
+ }
+ rcu_read_unlock();
+ return err;
+}
+
+static int ipv6_count_addresses(const struct inet6_dev *idev)
+{
+ const struct inet6_ifaddr *ifp;
+ int cnt = 0;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
+ cnt++;
+ rcu_read_unlock();
+ return cnt;
+}
+
+int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
+ const struct net_device *dev, int strict)
+{
+ return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
+ strict, IFA_F_TENTATIVE);
+}
+EXPORT_SYMBOL(ipv6_chk_addr);
+
+/* device argument is used to find the L3 domain of interest. If
+ * skip_dev_check is set, then the ifp device is not checked against
+ * the passed in dev argument. So the 2 cases for addresses checks are:
+ * 1. does the address exist in the L3 domain that dev is part of
+ * (skip_dev_check = true), or
+ *
+ * 2. does the address exist on the specific device
+ * (skip_dev_check = false)
+ */
+int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
+ const struct net_device *dev, bool skip_dev_check,
+ int strict, u32 banned_flags)
+{
+ unsigned int hash = inet6_addr_hash(net, addr);
+ const struct net_device *l3mdev;
+ struct inet6_ifaddr *ifp;
+ u32 ifp_flags;
+
+ rcu_read_lock();
+
+ l3mdev = l3mdev_master_dev_rcu(dev);
+ if (skip_dev_check)
+ dev = NULL;
+
+ hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
+ if (!net_eq(dev_net(ifp->idev->dev), net))
+ continue;
+
+ if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
+ continue;
+
+ /* Decouple optimistic from tentative for evaluation here.
+ * Ban optimistic addresses explicitly, when required.
+ */
+ ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
+ ? (ifp->flags&~IFA_F_TENTATIVE)
+ : ifp->flags;
+ if (ipv6_addr_equal(&ifp->addr, addr) &&
+ !(ifp_flags&banned_flags) &&
+ (!dev || ifp->idev->dev == dev ||
+ !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
+ rcu_read_unlock();
+ return 1;
+ }
+ }
+
+ rcu_read_unlock();
+ return 0;
+}
+EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
+
+
+/* Compares an address/prefix_len with addresses on device @dev.
+ * If one is found it returns true.
+ */
+bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
+ const unsigned int prefix_len, struct net_device *dev)
+{
+ const struct inet6_ifaddr *ifa;
+ const struct inet6_dev *idev;
+ bool ret = false;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
+ ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
+ if (ret)
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+EXPORT_SYMBOL(ipv6_chk_custom_prefix);
+
+int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
+{
+ const struct inet6_ifaddr *ifa;
+ const struct inet6_dev *idev;
+ int onlink;
+
+ onlink = 0;
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
+ onlink = ipv6_prefix_equal(addr, &ifa->addr,
+ ifa->prefix_len);
+ if (onlink)
+ break;
+ }
+ }
+ rcu_read_unlock();
+ return onlink;
+}
+EXPORT_SYMBOL(ipv6_chk_prefix);
+
+struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
+ struct net_device *dev, int strict)
+{
+ unsigned int hash = inet6_addr_hash(net, addr);
+ struct inet6_ifaddr *ifp, *result = NULL;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
+ if (!net_eq(dev_net(ifp->idev->dev), net))
+ continue;
+ if (ipv6_addr_equal(&ifp->addr, addr)) {
+ if (!dev || ifp->idev->dev == dev ||
+ !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
+ result = ifp;
+ in6_ifa_hold(ifp);
+ break;
+ }
+ }
+ }
+ rcu_read_unlock();
+
+ return result;
+}
+
+/* Gets referenced address, destroys ifaddr */
+
+static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
+{
+ if (dad_failed)
+ ifp->flags |= IFA_F_DADFAILED;
+
+ if (ifp->flags&IFA_F_TEMPORARY) {
+ struct inet6_ifaddr *ifpub;
+ spin_lock_bh(&ifp->lock);
+ ifpub = ifp->ifpub;
+ if (ifpub) {
+ in6_ifa_hold(ifpub);
+ spin_unlock_bh(&ifp->lock);
+ ipv6_create_tempaddr(ifpub, ifp, true);
+ in6_ifa_put(ifpub);
+ } else {
+ spin_unlock_bh(&ifp->lock);
+ }
+ ipv6_del_addr(ifp);
+ } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
+ spin_lock_bh(&ifp->lock);
+ addrconf_del_dad_work(ifp);
+ ifp->flags |= IFA_F_TENTATIVE;
+ if (dad_failed)
+ ifp->flags &= ~IFA_F_OPTIMISTIC;
+ spin_unlock_bh(&ifp->lock);
+ if (dad_failed)
+ ipv6_ifa_notify(0, ifp);
+ in6_ifa_put(ifp);
+ } else {
+ ipv6_del_addr(ifp);
+ }
+}
+
+static int addrconf_dad_end(struct inet6_ifaddr *ifp)
+{
+ int err = -ENOENT;
+
+ spin_lock_bh(&ifp->lock);
+ if (ifp->state == INET6_IFADDR_STATE_DAD) {
+ ifp->state = INET6_IFADDR_STATE_POSTDAD;
+ err = 0;
+ }
+ spin_unlock_bh(&ifp->lock);
+
+ return err;
+}
+
+void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
+{
+ struct inet6_dev *idev = ifp->idev;
+ struct net *net = dev_net(ifp->idev->dev);
+
+ if (addrconf_dad_end(ifp)) {
+ in6_ifa_put(ifp);
+ return;
+ }
+
+ net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
+ ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
+
+ spin_lock_bh(&ifp->lock);
+
+ if (ifp->flags & IFA_F_STABLE_PRIVACY) {
+ struct in6_addr new_addr;
+ struct inet6_ifaddr *ifp2;
+ int retries = ifp->stable_privacy_retry + 1;
+ struct ifa6_config cfg = {
+ .pfx = &new_addr,
+ .plen = ifp->prefix_len,
+ .ifa_flags = ifp->flags,
+ .valid_lft = ifp->valid_lft,
+ .preferred_lft = ifp->prefered_lft,
+ .scope = ifp->scope,
+ };
+
+ if (retries > net->ipv6.sysctl.idgen_retries) {
+ net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
+ ifp->idev->dev->name);
+ goto errdad;
+ }
+
+ new_addr = ifp->addr;
+ if (ipv6_generate_stable_address(&new_addr, retries,
+ idev))
+ goto errdad;
+
+ spin_unlock_bh(&ifp->lock);
+
+ if (idev->cnf.max_addresses &&
+ ipv6_count_addresses(idev) >=
+ idev->cnf.max_addresses)
+ goto lock_errdad;
+
+ net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
+ ifp->idev->dev->name);
+
+ ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
+ if (IS_ERR(ifp2))
+ goto lock_errdad;
+
+ spin_lock_bh(&ifp2->lock);
+ ifp2->stable_privacy_retry = retries;
+ ifp2->state = INET6_IFADDR_STATE_PREDAD;
+ spin_unlock_bh(&ifp2->lock);
+
+ addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
+ in6_ifa_put(ifp2);
+lock_errdad:
+ spin_lock_bh(&ifp->lock);
+ }
+
+errdad:
+ /* transition from _POSTDAD to _ERRDAD */
+ ifp->state = INET6_IFADDR_STATE_ERRDAD;
+ spin_unlock_bh(&ifp->lock);
+
+ addrconf_mod_dad_work(ifp, 0);
+ in6_ifa_put(ifp);
+}
+
+/* Join to solicited addr multicast group.
+ * caller must hold RTNL */
+void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
+{
+ struct in6_addr maddr;
+
+ if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
+ return;
+
+ addrconf_addr_solict_mult(addr, &maddr);
+ ipv6_dev_mc_inc(dev, &maddr);
+}
+
+/* caller must hold RTNL */
+void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
+{
+ struct in6_addr maddr;
+
+ if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
+ return;
+
+ addrconf_addr_solict_mult(addr, &maddr);
+ __ipv6_dev_mc_dec(idev, &maddr);
+}
+
+/* caller must hold RTNL */
+static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
+{
+ struct in6_addr addr;
+
+ if (ifp->prefix_len >= 127) /* RFC 6164 */
+ return;
+ ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
+ if (ipv6_addr_any(&addr))
+ return;
+ __ipv6_dev_ac_inc(ifp->idev, &addr);
+}
+
+/* caller must hold RTNL */
+static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
+{
+ struct in6_addr addr;
+
+ if (ifp->prefix_len >= 127) /* RFC 6164 */
+ return;
+ ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
+ if (ipv6_addr_any(&addr))
+ return;
+ __ipv6_dev_ac_dec(ifp->idev, &addr);
+}
+
+static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
+{
+ switch (dev->addr_len) {
+ case ETH_ALEN:
+ memcpy(eui, dev->dev_addr, 3);
+ eui[3] = 0xFF;
+ eui[4] = 0xFE;
+ memcpy(eui + 5, dev->dev_addr + 3, 3);
+ break;
+ case EUI64_ADDR_LEN:
+ memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
+ eui[0] ^= 2;
+ break;
+ default:
+ return -1;
+ }
+
+ return 0;
+}
+
+static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
+{
+ union fwnet_hwaddr *ha;
+
+ if (dev->addr_len != FWNET_ALEN)
+ return -1;
+
+ ha = (union fwnet_hwaddr *)dev->dev_addr;
+
+ memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
+ eui[0] ^= 2;
+ return 0;
+}
+
+static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
+{
+ /* XXX: inherit EUI-64 from other interface -- yoshfuji */
+ if (dev->addr_len != ARCNET_ALEN)
+ return -1;
+ memset(eui, 0, 7);
+ eui[7] = *(u8 *)dev->dev_addr;
+ return 0;
+}
+
+static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
+{
+ if (dev->addr_len != INFINIBAND_ALEN)
+ return -1;
+ memcpy(eui, dev->dev_addr + 12, 8);
+ eui[0] |= 2;
+ return 0;
+}
+
+static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
+{
+ if (addr == 0)
+ return -1;
+ eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
+ ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
+ ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
+ ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
+ ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
+ ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
+ eui[1] = 0;
+ eui[2] = 0x5E;
+ eui[3] = 0xFE;
+ memcpy(eui + 4, &addr, 4);
+ return 0;
+}
+
+static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
+{
+ if (dev->priv_flags & IFF_ISATAP)
+ return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
+ return -1;
+}
+
+static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
+{
+ return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
+}
+
+static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
+{
+ memcpy(eui, dev->perm_addr, 3);
+ memcpy(eui + 5, dev->perm_addr + 3, 3);
+ eui[3] = 0xFF;
+ eui[4] = 0xFE;
+ eui[0] ^= 2;
+ return 0;
+}
+
+static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
+{
+ switch (dev->type) {
+ case ARPHRD_ETHER:
+ case ARPHRD_FDDI:
+ return addrconf_ifid_eui48(eui, dev);
+ case ARPHRD_ARCNET:
+ return addrconf_ifid_arcnet(eui, dev);
+ case ARPHRD_INFINIBAND:
+ return addrconf_ifid_infiniband(eui, dev);
+ case ARPHRD_SIT:
+ return addrconf_ifid_sit(eui, dev);
+ case ARPHRD_IPGRE:
+ case ARPHRD_TUNNEL:
+ return addrconf_ifid_gre(eui, dev);
+ case ARPHRD_6LOWPAN:
+ return addrconf_ifid_6lowpan(eui, dev);
+ case ARPHRD_IEEE1394:
+ return addrconf_ifid_ieee1394(eui, dev);
+ case ARPHRD_TUNNEL6:
+ case ARPHRD_IP6GRE:
+ case ARPHRD_RAWIP:
+ return addrconf_ifid_ip6tnl(eui, dev);
+ }
+ return -1;
+}
+
+static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
+{
+ int err = -1;
+ struct inet6_ifaddr *ifp;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
+ if (ifp->scope > IFA_LINK)
+ break;
+ if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
+ memcpy(eui, ifp->addr.s6_addr+8, 8);
+ err = 0;
+ break;
+ }
+ }
+ read_unlock_bh(&idev->lock);
+ return err;
+}
+
+/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
+static void ipv6_regen_rndid(struct inet6_dev *idev)
+{
+regen:
+ get_random_bytes(idev->rndid, sizeof(idev->rndid));
+ idev->rndid[0] &= ~0x02;
+
+ /*
+ * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
+ * check if generated address is not inappropriate
+ *
+ * - Reserved subnet anycast (RFC 2526)
+ * 11111101 11....11 1xxxxxxx
+ * - ISATAP (RFC4214) 6.1
+ * 00-00-5E-FE-xx-xx-xx-xx
+ * - value 0
+ * - XXX: already assigned to an address on the device
+ */
+ if (idev->rndid[0] == 0xfd &&
+ (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
+ (idev->rndid[7]&0x80))
+ goto regen;
+ if ((idev->rndid[0]|idev->rndid[1]) == 0) {
+ if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
+ goto regen;
+ if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
+ goto regen;
+ }
+}
+
+static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
+{
+ if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
+ ipv6_regen_rndid(idev);
+}
+
+/*
+ * Add prefix route.
+ */
+
+static void
+addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
+ struct net_device *dev, unsigned long expires,
+ u32 flags, gfp_t gfp_flags)
+{
+ struct fib6_config cfg = {
+ .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
+ .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
+ .fc_ifindex = dev->ifindex,
+ .fc_expires = expires,
+ .fc_dst_len = plen,
+ .fc_flags = RTF_UP | flags,
+ .fc_nlinfo.nl_net = dev_net(dev),
+ .fc_protocol = RTPROT_KERNEL,
+ .fc_type = RTN_UNICAST,
+ };
+
+ cfg.fc_dst = *pfx;
+
+ /* Prevent useless cloning on PtP SIT.
+ This thing is done here expecting that the whole
+ class of non-broadcast devices need not cloning.
+ */
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+ if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
+ cfg.fc_flags |= RTF_NONEXTHOP;
+#endif
+
+ ip6_route_add(&cfg, gfp_flags, NULL);
+}
+
+
+static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
+ int plen,
+ const struct net_device *dev,
+ u32 flags, u32 noflags)
+{
+ struct fib6_node *fn;
+ struct fib6_info *rt = NULL;
+ struct fib6_table *table;
+ u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
+
+ table = fib6_get_table(dev_net(dev), tb_id);
+ if (!table)
+ return NULL;
+
+ rcu_read_lock();
+ fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
+ if (!fn)
+ goto out;
+
+ for_each_fib6_node_rt_rcu(fn) {
+ if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
+ continue;
+ if ((rt->fib6_flags & flags) != flags)
+ continue;
+ if ((rt->fib6_flags & noflags) != 0)
+ continue;
+ if (!fib6_info_hold_safe(rt))
+ continue;
+ break;
+ }
+out:
+ rcu_read_unlock();
+ return rt;
+}
+
+
+/* Create "default" multicast route to the interface */
+
+static void addrconf_add_mroute(struct net_device *dev)
+{
+ struct fib6_config cfg = {
+ .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
+ .fc_metric = IP6_RT_PRIO_ADDRCONF,
+ .fc_ifindex = dev->ifindex,
+ .fc_dst_len = 8,
+ .fc_flags = RTF_UP,
+ .fc_type = RTN_UNICAST,
+ .fc_nlinfo.nl_net = dev_net(dev),
+ };
+
+ ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
+
+ ip6_route_add(&cfg, GFP_KERNEL, NULL);
+}
+
+static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ idev = ipv6_find_idev(dev);
+ if (!idev)
+ return ERR_PTR(-ENOBUFS);
+
+ if (idev->cnf.disable_ipv6)
+ return ERR_PTR(-EACCES);
+
+ /* Add default multicast route */
+ if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
+ addrconf_add_mroute(dev);
+
+ return idev;
+}
+
+static void manage_tempaddrs(struct inet6_dev *idev,
+ struct inet6_ifaddr *ifp,
+ __u32 valid_lft, __u32 prefered_lft,
+ bool create, unsigned long now)
+{
+ u32 flags;
+ struct inet6_ifaddr *ift;
+
+ read_lock_bh(&idev->lock);
+ /* update all temporary addresses in the list */
+ list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
+ int age, max_valid, max_prefered;
+
+ if (ifp != ift->ifpub)
+ continue;
+
+ /* RFC 4941 section 3.3:
+ * If a received option will extend the lifetime of a public
+ * address, the lifetimes of temporary addresses should
+ * be extended, subject to the overall constraint that no
+ * temporary addresses should ever remain "valid" or "preferred"
+ * for a time longer than (TEMP_VALID_LIFETIME) or
+ * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
+ */
+ age = (now - ift->cstamp) / HZ;
+ max_valid = idev->cnf.temp_valid_lft - age;
+ if (max_valid < 0)
+ max_valid = 0;
+
+ max_prefered = idev->cnf.temp_prefered_lft -
+ idev->desync_factor - age;
+ if (max_prefered < 0)
+ max_prefered = 0;
+
+ if (valid_lft > max_valid)
+ valid_lft = max_valid;
+
+ if (prefered_lft > max_prefered)
+ prefered_lft = max_prefered;
+
+ spin_lock(&ift->lock);
+ flags = ift->flags;
+ ift->valid_lft = valid_lft;
+ ift->prefered_lft = prefered_lft;
+ ift->tstamp = now;
+ if (prefered_lft > 0)
+ ift->flags &= ~IFA_F_DEPRECATED;
+
+ spin_unlock(&ift->lock);
+ if (!(flags&IFA_F_TENTATIVE))
+ ipv6_ifa_notify(0, ift);
+ }
+
+ if ((create || list_empty(&idev->tempaddr_list)) &&
+ idev->cnf.use_tempaddr > 0) {
+ /* When a new public address is created as described
+ * in [ADDRCONF], also create a new temporary address.
+ * Also create a temporary address if it's enabled but
+ * no temporary address currently exists.
+ */
+ read_unlock_bh(&idev->lock);
+ ipv6_create_tempaddr(ifp, NULL, false);
+ } else {
+ read_unlock_bh(&idev->lock);
+ }
+}
+
+static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
+{
+ return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
+ idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
+}
+
+int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
+ const struct prefix_info *pinfo,
+ struct inet6_dev *in6_dev,
+ const struct in6_addr *addr, int addr_type,
+ u32 addr_flags, bool sllao, bool tokenized,
+ __u32 valid_lft, u32 prefered_lft)
+{
+ struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
+ int create = 0, update_lft = 0;
+
+ if (!ifp && valid_lft) {
+ int max_addresses = in6_dev->cnf.max_addresses;
+ struct ifa6_config cfg = {
+ .pfx = addr,
+ .plen = pinfo->prefix_len,
+ .ifa_flags = addr_flags,
+ .valid_lft = valid_lft,
+ .preferred_lft = prefered_lft,
+ .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
+ };
+
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ if ((net->ipv6.devconf_all->optimistic_dad ||
+ in6_dev->cnf.optimistic_dad) &&
+ !net->ipv6.devconf_all->forwarding && sllao)
+ cfg.ifa_flags |= IFA_F_OPTIMISTIC;
+#endif
+
+ /* Do not allow to create too much of autoconfigured
+ * addresses; this would be too easy way to crash kernel.
+ */
+ if (!max_addresses ||
+ ipv6_count_addresses(in6_dev) < max_addresses)
+ ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
+
+ if (IS_ERR_OR_NULL(ifp))
+ return -1;
+
+ create = 1;
+ spin_lock_bh(&ifp->lock);
+ ifp->flags |= IFA_F_MANAGETEMPADDR;
+ ifp->cstamp = jiffies;
+ ifp->tokenized = tokenized;
+ spin_unlock_bh(&ifp->lock);
+ addrconf_dad_start(ifp);
+ }
+
+ if (ifp) {
+ u32 flags;
+ unsigned long now;
+ u32 stored_lft;
+
+ /* update lifetime (RFC2462 5.5.3 e) */
+ spin_lock_bh(&ifp->lock);
+ now = jiffies;
+ if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
+ stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
+ else
+ stored_lft = 0;
+ if (!create && stored_lft) {
+ const u32 minimum_lft = min_t(u32,
+ stored_lft, MIN_VALID_LIFETIME);
+ valid_lft = max(valid_lft, minimum_lft);
+
+ /* RFC4862 Section 5.5.3e:
+ * "Note that the preferred lifetime of the
+ * corresponding address is always reset to
+ * the Preferred Lifetime in the received
+ * Prefix Information option, regardless of
+ * whether the valid lifetime is also reset or
+ * ignored."
+ *
+ * So we should always update prefered_lft here.
+ */
+ update_lft = 1;
+ }
+
+ if (update_lft) {
+ ifp->valid_lft = valid_lft;
+ ifp->prefered_lft = prefered_lft;
+ ifp->tstamp = now;
+ flags = ifp->flags;
+ ifp->flags &= ~IFA_F_DEPRECATED;
+ spin_unlock_bh(&ifp->lock);
+
+ if (!(flags&IFA_F_TENTATIVE))
+ ipv6_ifa_notify(0, ifp);
+ } else
+ spin_unlock_bh(&ifp->lock);
+
+ manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
+ create, now);
+
+ in6_ifa_put(ifp);
+ addrconf_verify();
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
+
+void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
+{
+ struct prefix_info *pinfo;
+ __u32 valid_lft;
+ __u32 prefered_lft;
+ int addr_type, err;
+ u32 addr_flags = 0;
+ struct inet6_dev *in6_dev;
+ struct net *net = dev_net(dev);
+
+ pinfo = (struct prefix_info *) opt;
+
+ if (len < sizeof(struct prefix_info)) {
+ netdev_dbg(dev, "addrconf: prefix option too short\n");
+ return;
+ }
+
+ /*
+ * Validation checks ([ADDRCONF], page 19)
+ */
+
+ addr_type = ipv6_addr_type(&pinfo->prefix);
+
+ if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
+ return;
+
+ valid_lft = ntohl(pinfo->valid);
+ prefered_lft = ntohl(pinfo->prefered);
+
+ if (prefered_lft > valid_lft) {
+ net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
+ return;
+ }
+
+ in6_dev = in6_dev_get(dev);
+
+ if (!in6_dev) {
+ net_dbg_ratelimited("addrconf: device %s not configured\n",
+ dev->name);
+ return;
+ }
+
+ /*
+ * Two things going on here:
+ * 1) Add routes for on-link prefixes
+ * 2) Configure prefixes with the auto flag set
+ */
+
+ if (pinfo->onlink) {
+ struct fib6_info *rt;
+ unsigned long rt_expires;
+
+ /* Avoid arithmetic overflow. Really, we could
+ * save rt_expires in seconds, likely valid_lft,
+ * but it would require division in fib gc, that it
+ * not good.
+ */
+ if (HZ > USER_HZ)
+ rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
+ else
+ rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
+
+ if (addrconf_finite_timeout(rt_expires))
+ rt_expires *= HZ;
+
+ rt = addrconf_get_prefix_route(&pinfo->prefix,
+ pinfo->prefix_len,
+ dev,
+ RTF_ADDRCONF | RTF_PREFIX_RT,
+ RTF_GATEWAY | RTF_DEFAULT);
+
+ if (rt) {
+ /* Autoconf prefix route */
+ if (valid_lft == 0) {
+ ip6_del_rt(net, rt);
+ rt = NULL;
+ } else if (addrconf_finite_timeout(rt_expires)) {
+ /* not infinity */
+ fib6_set_expires(rt, jiffies + rt_expires);
+ } else {
+ fib6_clean_expires(rt);
+ }
+ } else if (valid_lft) {
+ clock_t expires = 0;
+ int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
+ if (addrconf_finite_timeout(rt_expires)) {
+ /* not infinity */
+ flags |= RTF_EXPIRES;
+ expires = jiffies_to_clock_t(rt_expires);
+ }
+ addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
+ 0, dev, expires, flags,
+ GFP_ATOMIC);
+ }
+ fib6_info_release(rt);
+ }
+
+ /* Try to figure out our local address for this prefix */
+
+ if (pinfo->autoconf && in6_dev->cnf.autoconf) {
+ struct in6_addr addr;
+ bool tokenized = false, dev_addr_generated = false;
+
+ if (pinfo->prefix_len == 64) {
+ memcpy(&addr, &pinfo->prefix, 8);
+
+ if (!ipv6_addr_any(&in6_dev->token)) {
+ read_lock_bh(&in6_dev->lock);
+ memcpy(addr.s6_addr + 8,
+ in6_dev->token.s6_addr + 8, 8);
+ read_unlock_bh(&in6_dev->lock);
+ tokenized = true;
+ } else if (is_addr_mode_generate_stable(in6_dev) &&
+ !ipv6_generate_stable_address(&addr, 0,
+ in6_dev)) {
+ addr_flags |= IFA_F_STABLE_PRIVACY;
+ goto ok;
+ } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
+ ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
+ goto put;
+ } else {
+ dev_addr_generated = true;
+ }
+ goto ok;
+ }
+ net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
+ pinfo->prefix_len);
+ goto put;
+
+ok:
+ err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
+ &addr, addr_type,
+ addr_flags, sllao,
+ tokenized, valid_lft,
+ prefered_lft);
+ if (err)
+ goto put;
+
+ /* Ignore error case here because previous prefix add addr was
+ * successful which will be notified.
+ */
+ ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
+ addr_type, addr_flags, sllao,
+ tokenized, valid_lft,
+ prefered_lft,
+ dev_addr_generated);
+ }
+ inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
+put:
+ in6_dev_put(in6_dev);
+}
+
+/*
+ * Set destination address.
+ * Special case for SIT interfaces where we create a new "virtual"
+ * device.
+ */
+int addrconf_set_dstaddr(struct net *net, void __user *arg)
+{
+ struct in6_ifreq ireq;
+ struct net_device *dev;
+ int err = -EINVAL;
+
+ rtnl_lock();
+
+ err = -EFAULT;
+ if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
+ goto err_exit;
+
+ dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
+
+ err = -ENODEV;
+ if (!dev)
+ goto err_exit;
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+ if (dev->type == ARPHRD_SIT) {
+ const struct net_device_ops *ops = dev->netdev_ops;
+ struct ifreq ifr;
+ struct ip_tunnel_parm p;
+
+ err = -EADDRNOTAVAIL;
+ if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
+ goto err_exit;
+
+ memset(&p, 0, sizeof(p));
+ p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
+ p.iph.saddr = 0;
+ p.iph.version = 4;
+ p.iph.ihl = 5;
+ p.iph.protocol = IPPROTO_IPV6;
+ p.iph.ttl = 64;
+ ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
+
+ if (ops->ndo_do_ioctl) {
+ mm_segment_t oldfs = get_fs();
+
+ set_fs(KERNEL_DS);
+ err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
+ set_fs(oldfs);
+ } else
+ err = -EOPNOTSUPP;
+
+ if (err == 0) {
+ err = -ENOBUFS;
+ dev = __dev_get_by_name(net, p.name);
+ if (!dev)
+ goto err_exit;
+ err = dev_open(dev);
+ }
+ }
+#endif
+
+err_exit:
+ rtnl_unlock();
+ return err;
+}
+
+static int ipv6_mc_config(struct sock *sk, bool join,
+ const struct in6_addr *addr, int ifindex)
+{
+ int ret;
+
+ ASSERT_RTNL();
+
+ lock_sock(sk);
+ if (join)
+ ret = ipv6_sock_mc_join(sk, ifindex, addr);
+ else
+ ret = ipv6_sock_mc_drop(sk, ifindex, addr);
+ release_sock(sk);
+
+ return ret;
+}
+
+/*
+ * Manual configuration of address on an interface
+ */
+static int inet6_addr_add(struct net *net, int ifindex,
+ struct ifa6_config *cfg,
+ struct netlink_ext_ack *extack)
+{
+ struct inet6_ifaddr *ifp;
+ struct inet6_dev *idev;
+ struct net_device *dev;
+ unsigned long timeout;
+ clock_t expires;
+ u32 flags;
+
+ ASSERT_RTNL();
+
+ if (cfg->plen > 128)
+ return -EINVAL;
+
+ /* check the lifetime */
+ if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
+ return -EINVAL;
+
+ if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
+ return -EINVAL;
+
+ dev = __dev_get_by_index(net, ifindex);
+ if (!dev)
+ return -ENODEV;
+
+ idev = addrconf_add_dev(dev);
+ if (IS_ERR(idev))
+ return PTR_ERR(idev);
+
+ if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
+ int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
+ true, cfg->pfx, ifindex);
+
+ if (ret < 0)
+ return ret;
+ }
+
+ cfg->scope = ipv6_addr_scope(cfg->pfx);
+
+ timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
+ if (addrconf_finite_timeout(timeout)) {
+ expires = jiffies_to_clock_t(timeout * HZ);
+ cfg->valid_lft = timeout;
+ flags = RTF_EXPIRES;
+ } else {
+ expires = 0;
+ flags = 0;
+ cfg->ifa_flags |= IFA_F_PERMANENT;
+ }
+
+ timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
+ if (addrconf_finite_timeout(timeout)) {
+ if (timeout == 0)
+ cfg->ifa_flags |= IFA_F_DEPRECATED;
+ cfg->preferred_lft = timeout;
+ }
+
+ ifp = ipv6_add_addr(idev, cfg, true, extack);
+ if (!IS_ERR(ifp)) {
+ if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
+ addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
+ ifp->rt_priority, dev, expires,
+ flags, GFP_KERNEL);
+ }
+
+ /* Send a netlink notification if DAD is enabled and
+ * optimistic flag is not set
+ */
+ if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
+ ipv6_ifa_notify(0, ifp);
+ /*
+ * Note that section 3.1 of RFC 4429 indicates
+ * that the Optimistic flag should not be set for
+ * manually configured addresses
+ */
+ addrconf_dad_start(ifp);
+ if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
+ manage_tempaddrs(idev, ifp, cfg->valid_lft,
+ cfg->preferred_lft, true, jiffies);
+ in6_ifa_put(ifp);
+ addrconf_verify_rtnl();
+ return 0;
+ } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
+ ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
+ cfg->pfx, ifindex);
+ }
+
+ return PTR_ERR(ifp);
+}
+
+static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
+ const struct in6_addr *pfx, unsigned int plen)
+{
+ struct inet6_ifaddr *ifp;
+ struct inet6_dev *idev;
+ struct net_device *dev;
+
+ if (plen > 128)
+ return -EINVAL;
+
+ dev = __dev_get_by_index(net, ifindex);
+ if (!dev)
+ return -ENODEV;
+
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ return -ENXIO;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(ifp, &idev->addr_list, if_list) {
+ if (ifp->prefix_len == plen &&
+ ipv6_addr_equal(pfx, &ifp->addr)) {
+ in6_ifa_hold(ifp);
+ read_unlock_bh(&idev->lock);
+
+ if (!(ifp->flags & IFA_F_TEMPORARY) &&
+ (ifa_flags & IFA_F_MANAGETEMPADDR))
+ manage_tempaddrs(idev, ifp, 0, 0, false,
+ jiffies);
+ ipv6_del_addr(ifp);
+ addrconf_verify_rtnl();
+ if (ipv6_addr_is_multicast(pfx)) {
+ ipv6_mc_config(net->ipv6.mc_autojoin_sk,
+ false, pfx, dev->ifindex);
+ }
+ return 0;
+ }
+ }
+ read_unlock_bh(&idev->lock);
+ return -EADDRNOTAVAIL;
+}
+
+
+int addrconf_add_ifaddr(struct net *net, void __user *arg)
+{
+ struct ifa6_config cfg = {
+ .ifa_flags = IFA_F_PERMANENT,
+ .preferred_lft = INFINITY_LIFE_TIME,
+ .valid_lft = INFINITY_LIFE_TIME,
+ };
+ struct in6_ifreq ireq;
+ int err;
+
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
+ return -EFAULT;
+
+ cfg.pfx = &ireq.ifr6_addr;
+ cfg.plen = ireq.ifr6_prefixlen;
+
+ rtnl_lock();
+ err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
+ rtnl_unlock();
+ return err;
+}
+
+int addrconf_del_ifaddr(struct net *net, void __user *arg)
+{
+ struct in6_ifreq ireq;
+ int err;
+
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
+ return -EFAULT;
+
+ rtnl_lock();
+ err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
+ ireq.ifr6_prefixlen);
+ rtnl_unlock();
+ return err;
+}
+
+static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
+ int plen, int scope)
+{
+ struct inet6_ifaddr *ifp;
+ struct ifa6_config cfg = {
+ .pfx = addr,
+ .plen = plen,
+ .ifa_flags = IFA_F_PERMANENT,
+ .valid_lft = INFINITY_LIFE_TIME,
+ .preferred_lft = INFINITY_LIFE_TIME,
+ .scope = scope
+ };
+
+ ifp = ipv6_add_addr(idev, &cfg, true, NULL);
+ if (!IS_ERR(ifp)) {
+ spin_lock_bh(&ifp->lock);
+ ifp->flags &= ~IFA_F_TENTATIVE;
+ spin_unlock_bh(&ifp->lock);
+ rt_genid_bump_ipv6(dev_net(idev->dev));
+ ipv6_ifa_notify(RTM_NEWADDR, ifp);
+ in6_ifa_put(ifp);
+ }
+}
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+static void sit_add_v4_addrs(struct inet6_dev *idev)
+{
+ struct in6_addr addr;
+ struct net_device *dev;
+ struct net *net = dev_net(idev->dev);
+ int scope, plen;
+ u32 pflags = 0;
+
+ ASSERT_RTNL();
+
+ memset(&addr, 0, sizeof(struct in6_addr));
+ memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
+
+ if (idev->dev->flags&IFF_POINTOPOINT) {
+ addr.s6_addr32[0] = htonl(0xfe800000);
+ scope = IFA_LINK;
+ plen = 64;
+ } else {
+ scope = IPV6_ADDR_COMPATv4;
+ plen = 96;
+ pflags |= RTF_NONEXTHOP;
+ }
+
+ if (addr.s6_addr32[3]) {
+ add_addr(idev, &addr, plen, scope);
+ addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
+ GFP_KERNEL);
+ return;
+ }
+
+ for_each_netdev(net, dev) {
+ struct in_device *in_dev = __in_dev_get_rtnl(dev);
+ if (in_dev && (dev->flags & IFF_UP)) {
+ struct in_ifaddr *ifa;
+
+ int flag = scope;
+
+ for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
+
+ addr.s6_addr32[3] = ifa->ifa_local;
+
+ if (ifa->ifa_scope == RT_SCOPE_LINK)
+ continue;
+ if (ifa->ifa_scope >= RT_SCOPE_HOST) {
+ if (idev->dev->flags&IFF_POINTOPOINT)
+ continue;
+ flag |= IFA_HOST;
+ }
+
+ add_addr(idev, &addr, plen, flag);
+ addrconf_prefix_route(&addr, plen, 0, idev->dev,
+ 0, pflags, GFP_KERNEL);
+ }
+ }
+ }
+}
+#endif
+
+static void init_loopback(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ /* ::1 */
+
+ ASSERT_RTNL();
+
+ idev = ipv6_find_idev(dev);
+ if (!idev) {
+ pr_debug("%s: add_dev failed\n", __func__);
+ return;
+ }
+
+ add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
+}
+
+void addrconf_add_linklocal(struct inet6_dev *idev,
+ const struct in6_addr *addr, u32 flags)
+{
+ struct ifa6_config cfg = {
+ .pfx = addr,
+ .plen = 64,
+ .ifa_flags = flags | IFA_F_PERMANENT,
+ .valid_lft = INFINITY_LIFE_TIME,
+ .preferred_lft = INFINITY_LIFE_TIME,
+ .scope = IFA_LINK
+ };
+ struct inet6_ifaddr *ifp;
+
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
+ idev->cnf.optimistic_dad) &&
+ !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
+ cfg.ifa_flags |= IFA_F_OPTIMISTIC;
+#endif
+
+ ifp = ipv6_add_addr(idev, &cfg, true, NULL);
+ if (!IS_ERR(ifp)) {
+ addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
+ 0, 0, GFP_ATOMIC);
+ addrconf_dad_start(ifp);
+ in6_ifa_put(ifp);
+ }
+}
+EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
+
+static bool ipv6_reserved_interfaceid(struct in6_addr address)
+{
+ if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
+ return true;
+
+ if (address.s6_addr32[2] == htonl(0x02005eff) &&
+ ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
+ return true;
+
+ if (address.s6_addr32[2] == htonl(0xfdffffff) &&
+ ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
+ return true;
+
+ return false;
+}
+
+static int ipv6_generate_stable_address(struct in6_addr *address,
+ u8 dad_count,
+ const struct inet6_dev *idev)
+{
+ static DEFINE_SPINLOCK(lock);
+ static __u32 digest[SHA_DIGEST_WORDS];
+ static __u32 workspace[SHA_WORKSPACE_WORDS];
+
+ static union {
+ char __data[SHA_MESSAGE_BYTES];
+ struct {
+ struct in6_addr secret;
+ __be32 prefix[2];
+ unsigned char hwaddr[MAX_ADDR_LEN];
+ u8 dad_count;
+ } __packed;
+ } data;
+
+ struct in6_addr secret;
+ struct in6_addr temp;
+ struct net *net = dev_net(idev->dev);
+
+ BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
+
+ if (idev->cnf.stable_secret.initialized)
+ secret = idev->cnf.stable_secret.secret;
+ else if (net->ipv6.devconf_dflt->stable_secret.initialized)
+ secret = net->ipv6.devconf_dflt->stable_secret.secret;
+ else
+ return -1;
+
+retry:
+ spin_lock_bh(&lock);
+
+ sha_init(digest);
+ memset(&data, 0, sizeof(data));
+ memset(workspace, 0, sizeof(workspace));
+ memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
+ data.prefix[0] = address->s6_addr32[0];
+ data.prefix[1] = address->s6_addr32[1];
+ data.secret = secret;
+ data.dad_count = dad_count;
+
+ sha_transform(digest, data.__data, workspace);
+
+ temp = *address;
+ temp.s6_addr32[2] = (__force __be32)digest[0];
+ temp.s6_addr32[3] = (__force __be32)digest[1];
+
+ spin_unlock_bh(&lock);
+
+ if (ipv6_reserved_interfaceid(temp)) {
+ dad_count++;
+ if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
+ return -1;
+ goto retry;
+ }
+
+ *address = temp;
+ return 0;
+}
+
+static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
+{
+ struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
+
+ if (s->initialized)
+ return;
+ s = &idev->cnf.stable_secret;
+ get_random_bytes(&s->secret, sizeof(s->secret));
+ s->initialized = true;
+}
+
+static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
+{
+ struct in6_addr addr;
+
+ /* no link local addresses on L3 master devices */
+ if (netif_is_l3_master(idev->dev))
+ return;
+
+ ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
+
+ switch (idev->cnf.addr_gen_mode) {
+ case IN6_ADDR_GEN_MODE_RANDOM:
+ ipv6_gen_mode_random_init(idev);
+ /* fallthrough */
+ case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
+ if (!ipv6_generate_stable_address(&addr, 0, idev))
+ addrconf_add_linklocal(idev, &addr,
+ IFA_F_STABLE_PRIVACY);
+ else if (prefix_route)
+ addrconf_prefix_route(&addr, 64, 0, idev->dev,
+ 0, 0, GFP_KERNEL);
+ break;
+ case IN6_ADDR_GEN_MODE_EUI64:
+ /* addrconf_add_linklocal also adds a prefix_route and we
+ * only need to care about prefix routes if ipv6_generate_eui64
+ * couldn't generate one.
+ */
+ if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
+ addrconf_add_linklocal(idev, &addr, 0);
+ else if (prefix_route)
+ addrconf_prefix_route(&addr, 64, 0, idev->dev,
+ 0, 0, GFP_KERNEL);
+ break;
+ case IN6_ADDR_GEN_MODE_NONE:
+ default:
+ /* will not add any link local address */
+ break;
+ }
+}
+
+static void addrconf_dev_config(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ if ((dev->type != ARPHRD_ETHER) &&
+ (dev->type != ARPHRD_FDDI) &&
+ (dev->type != ARPHRD_ARCNET) &&
+ (dev->type != ARPHRD_INFINIBAND) &&
+ (dev->type != ARPHRD_IEEE1394) &&
+ (dev->type != ARPHRD_TUNNEL6) &&
+ (dev->type != ARPHRD_6LOWPAN) &&
+ (dev->type != ARPHRD_IP6GRE) &&
+ (dev->type != ARPHRD_IPGRE) &&
+ (dev->type != ARPHRD_TUNNEL) &&
+ (dev->type != ARPHRD_NONE) &&
+ (dev->type != ARPHRD_RAWIP)) {
+ /* Alas, we support only Ethernet autoconfiguration. */
+ return;
+ }
+
+ idev = addrconf_add_dev(dev);
+ if (IS_ERR(idev))
+ return;
+
+ /* this device type has no EUI support */
+ if (dev->type == ARPHRD_NONE &&
+ idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
+ idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
+
+ addrconf_addr_gen(idev, false);
+}
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+static void addrconf_sit_config(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ /*
+ * Configure the tunnel with one of our IPv4
+ * addresses... we should configure all of
+ * our v4 addrs in the tunnel
+ */
+
+ idev = ipv6_find_idev(dev);
+ if (!idev) {
+ pr_debug("%s: add_dev failed\n", __func__);
+ return;
+ }
+
+ if (dev->priv_flags & IFF_ISATAP) {
+ addrconf_addr_gen(idev, false);
+ return;
+ }
+
+ sit_add_v4_addrs(idev);
+
+ if (dev->flags&IFF_POINTOPOINT)
+ addrconf_add_mroute(dev);
+}
+#endif
+
+#if IS_ENABLED(CONFIG_NET_IPGRE)
+static void addrconf_gre_config(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ idev = ipv6_find_idev(dev);
+ if (!idev) {
+ pr_debug("%s: add_dev failed\n", __func__);
+ return;
+ }
+
+ addrconf_addr_gen(idev, true);
+ if (dev->flags & IFF_POINTOPOINT)
+ addrconf_add_mroute(dev);
+}
+#endif
+
+static int fixup_permanent_addr(struct net *net,
+ struct inet6_dev *idev,
+ struct inet6_ifaddr *ifp)
+{
+ /* !fib6_node means the host route was removed from the
+ * FIB, for example, if 'lo' device is taken down. In that
+ * case regenerate the host route.
+ */
+ if (!ifp->rt || !ifp->rt->fib6_node) {
+ struct fib6_info *f6i, *prev;
+
+ f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
+ GFP_ATOMIC);
+ if (IS_ERR(f6i))
+ return PTR_ERR(f6i);
+
+ /* ifp->rt can be accessed outside of rtnl */
+ spin_lock(&ifp->lock);
+ prev = ifp->rt;
+ ifp->rt = f6i;
+ spin_unlock(&ifp->lock);
+
+ fib6_info_release(prev);
+ }
+
+ if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
+ addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
+ ifp->rt_priority, idev->dev, 0, 0,
+ GFP_ATOMIC);
+ }
+
+ if (ifp->state == INET6_IFADDR_STATE_PREDAD)
+ addrconf_dad_start(ifp);
+
+ return 0;
+}
+
+static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
+{
+ struct inet6_ifaddr *ifp, *tmp;
+ struct inet6_dev *idev;
+
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ return;
+
+ write_lock_bh(&idev->lock);
+
+ list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
+ if ((ifp->flags & IFA_F_PERMANENT) &&
+ fixup_permanent_addr(net, idev, ifp) < 0) {
+ write_unlock_bh(&idev->lock);
+ in6_ifa_hold(ifp);
+ ipv6_del_addr(ifp);
+ write_lock_bh(&idev->lock);
+
+ net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
+ idev->dev->name, &ifp->addr);
+ }
+ }
+
+ write_unlock_bh(&idev->lock);
+}
+
+static int addrconf_notify(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct netdev_notifier_changeupper_info *info;
+ struct inet6_dev *idev = __in6_dev_get(dev);
+ struct net *net = dev_net(dev);
+ int run_pending = 0;
+ int err;
+
+ switch (event) {
+ case NETDEV_REGISTER:
+ if (!idev && dev->mtu >= IPV6_MIN_MTU) {
+ idev = ipv6_add_dev(dev);
+ if (IS_ERR(idev))
+ return notifier_from_errno(PTR_ERR(idev));
+ }
+ break;
+
+ case NETDEV_CHANGEMTU:
+ /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
+ if (dev->mtu < IPV6_MIN_MTU) {
+ addrconf_ifdown(dev, dev != net->loopback_dev);
+ break;
+ }
+
+ if (idev) {
+ rt6_mtu_change(dev, dev->mtu);
+ idev->cnf.mtu6 = dev->mtu;
+ break;
+ }
+
+ /* allocate new idev */
+ idev = ipv6_add_dev(dev);
+ if (IS_ERR(idev))
+ break;
+
+ /* device is still not ready */
+ if (!(idev->if_flags & IF_READY))
+ break;
+
+ run_pending = 1;
+
+ /* fall through */
+
+ case NETDEV_UP:
+ case NETDEV_CHANGE:
+ if (dev->flags & IFF_SLAVE)
+ break;
+
+ if (idev && idev->cnf.disable_ipv6)
+ break;
+
+ if (event == NETDEV_UP) {
+ /* restore routes for permanent addresses */
+ addrconf_permanent_addr(net, dev);
+
+ if (!addrconf_link_ready(dev)) {
+ /* device is not ready yet. */
+ pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
+ dev->name);
+ break;
+ }
+
+ if (!idev && dev->mtu >= IPV6_MIN_MTU)
+ idev = ipv6_add_dev(dev);
+
+ if (!IS_ERR_OR_NULL(idev)) {
+ idev->if_flags |= IF_READY;
+ run_pending = 1;
+ }
+ } else if (event == NETDEV_CHANGE) {
+ if (!addrconf_link_ready(dev)) {
+ /* device is still not ready. */
+ rt6_sync_down_dev(dev, event);
+ break;
+ }
+
+ if (idev) {
+ if (idev->if_flags & IF_READY) {
+ /* device is already configured -
+ * but resend MLD reports, we might
+ * have roamed and need to update
+ * multicast snooping switches
+ */
+ ipv6_mc_up(idev);
+ rt6_sync_up(dev, RTNH_F_LINKDOWN);
+ break;
+ }
+ idev->if_flags |= IF_READY;
+ }
+
+ pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
+ dev->name);
+
+ run_pending = 1;
+ }
+
+ switch (dev->type) {
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+ case ARPHRD_SIT:
+ addrconf_sit_config(dev);
+ break;
+#endif
+#if IS_ENABLED(CONFIG_NET_IPGRE)
+ case ARPHRD_IPGRE:
+ addrconf_gre_config(dev);
+ break;
+#endif
+ case ARPHRD_LOOPBACK:
+ init_loopback(dev);
+ break;
+
+ default:
+ addrconf_dev_config(dev);
+ break;
+ }
+
+ if (!IS_ERR_OR_NULL(idev)) {
+ if (run_pending)
+ addrconf_dad_run(idev);
+
+ /* Device has an address by now */
+ rt6_sync_up(dev, RTNH_F_DEAD);
+
+ /*
+ * If the MTU changed during the interface down,
+ * when the interface up, the changed MTU must be
+ * reflected in the idev as well as routers.
+ */
+ if (idev->cnf.mtu6 != dev->mtu &&
+ dev->mtu >= IPV6_MIN_MTU) {
+ rt6_mtu_change(dev, dev->mtu);
+ idev->cnf.mtu6 = dev->mtu;
+ }
+ idev->tstamp = jiffies;
+ inet6_ifinfo_notify(RTM_NEWLINK, idev);
+
+ /*
+ * If the changed mtu during down is lower than
+ * IPV6_MIN_MTU stop IPv6 on this interface.
+ */
+ if (dev->mtu < IPV6_MIN_MTU)
+ addrconf_ifdown(dev, dev != net->loopback_dev);
+ }
+ break;
+
+ case NETDEV_DOWN:
+ case NETDEV_UNREGISTER:
+ /*
+ * Remove all addresses from this interface.
+ */
+ addrconf_ifdown(dev, event != NETDEV_DOWN);
+ break;
+
+ case NETDEV_CHANGENAME:
+ if (idev) {
+ snmp6_unregister_dev(idev);
+ addrconf_sysctl_unregister(idev);
+ err = addrconf_sysctl_register(idev);
+ if (err)
+ return notifier_from_errno(err);
+ err = snmp6_register_dev(idev);
+ if (err) {
+ addrconf_sysctl_unregister(idev);
+ return notifier_from_errno(err);
+ }
+ }
+ break;
+
+ case NETDEV_PRE_TYPE_CHANGE:
+ case NETDEV_POST_TYPE_CHANGE:
+ if (idev)
+ addrconf_type_change(dev, event);
+ break;
+
+ case NETDEV_CHANGEUPPER:
+ info = ptr;
+
+ /* flush all routes if dev is linked to or unlinked from
+ * an L3 master device (e.g., VRF)
+ */
+ if (info->upper_dev && netif_is_l3_master(info->upper_dev))
+ addrconf_ifdown(dev, 0);
+ }
+
+ return NOTIFY_OK;
+}
+
+/*
+ * addrconf module should be notified of a device going up
+ */
+static struct notifier_block ipv6_dev_notf = {
+ .notifier_call = addrconf_notify,
+ .priority = ADDRCONF_NOTIFY_PRIORITY,
+};
+
+static void addrconf_type_change(struct net_device *dev, unsigned long event)
+{
+ struct inet6_dev *idev;
+ ASSERT_RTNL();
+
+ idev = __in6_dev_get(dev);
+
+ if (event == NETDEV_POST_TYPE_CHANGE)
+ ipv6_mc_remap(idev);
+ else if (event == NETDEV_PRE_TYPE_CHANGE)
+ ipv6_mc_unmap(idev);
+}
+
+static bool addr_is_local(const struct in6_addr *addr)
+{
+ return ipv6_addr_type(addr) &
+ (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
+}
+
+static int addrconf_ifdown(struct net_device *dev, int how)
+{
+ unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
+ struct net *net = dev_net(dev);
+ struct inet6_dev *idev;
+ struct inet6_ifaddr *ifa, *tmp;
+ bool keep_addr = false;
+ int state, i;
+
+ ASSERT_RTNL();
+
+ rt6_disable_ip(dev, event);
+
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ return -ENODEV;
+
+ /*
+ * Step 1: remove reference to ipv6 device from parent device.
+ * Do not dev_put!
+ */
+ if (how) {
+ idev->dead = 1;
+
+ /* protected by rtnl_lock */
+ RCU_INIT_POINTER(dev->ip6_ptr, NULL);
+
+ /* Step 1.5: remove snmp6 entry */
+ snmp6_unregister_dev(idev);
+
+ }
+
+ /* combine the user config with event to determine if permanent
+ * addresses are to be removed from address hash table
+ */
+ if (!how && !idev->cnf.disable_ipv6) {
+ /* aggregate the system setting and interface setting */
+ int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
+
+ if (!_keep_addr)
+ _keep_addr = idev->cnf.keep_addr_on_down;
+
+ keep_addr = (_keep_addr > 0);
+ }
+
+ /* Step 2: clear hash table */
+ for (i = 0; i < IN6_ADDR_HSIZE; i++) {
+ struct hlist_head *h = &inet6_addr_lst[i];
+
+ spin_lock_bh(&addrconf_hash_lock);
+restart:
+ hlist_for_each_entry_rcu(ifa, h, addr_lst) {
+ if (ifa->idev == idev) {
+ addrconf_del_dad_work(ifa);
+ /* combined flag + permanent flag decide if
+ * address is retained on a down event
+ */
+ if (!keep_addr ||
+ !(ifa->flags & IFA_F_PERMANENT) ||
+ addr_is_local(&ifa->addr)) {
+ hlist_del_init_rcu(&ifa->addr_lst);
+ goto restart;
+ }
+ }
+ }
+ spin_unlock_bh(&addrconf_hash_lock);
+ }
+
+ write_lock_bh(&idev->lock);
+
+ addrconf_del_rs_timer(idev);
+
+ /* Step 2: clear flags for stateless addrconf */
+ if (!how)
+ idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
+
+ /* Step 3: clear tempaddr list */
+ while (!list_empty(&idev->tempaddr_list)) {
+ ifa = list_first_entry(&idev->tempaddr_list,
+ struct inet6_ifaddr, tmp_list);
+ list_del(&ifa->tmp_list);
+ write_unlock_bh(&idev->lock);
+ spin_lock_bh(&ifa->lock);
+
+ if (ifa->ifpub) {
+ in6_ifa_put(ifa->ifpub);
+ ifa->ifpub = NULL;
+ }
+ spin_unlock_bh(&ifa->lock);
+ in6_ifa_put(ifa);
+ write_lock_bh(&idev->lock);
+ }
+
+ list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
+ struct fib6_info *rt = NULL;
+ bool keep;
+
+ addrconf_del_dad_work(ifa);
+
+ keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
+ !addr_is_local(&ifa->addr);
+
+ write_unlock_bh(&idev->lock);
+ spin_lock_bh(&ifa->lock);
+
+ if (keep) {
+ /* set state to skip the notifier below */
+ state = INET6_IFADDR_STATE_DEAD;
+ ifa->state = INET6_IFADDR_STATE_PREDAD;
+ if (!(ifa->flags & IFA_F_NODAD))
+ ifa->flags |= IFA_F_TENTATIVE;
+
+ rt = ifa->rt;
+ ifa->rt = NULL;
+ } else {
+ state = ifa->state;
+ ifa->state = INET6_IFADDR_STATE_DEAD;
+ }
+
+ spin_unlock_bh(&ifa->lock);
+
+ if (rt)
+ ip6_del_rt(net, rt);
+
+ if (state != INET6_IFADDR_STATE_DEAD) {
+ __ipv6_ifa_notify(RTM_DELADDR, ifa);
+ inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
+ } else {
+ if (idev->cnf.forwarding)
+ addrconf_leave_anycast(ifa);
+ addrconf_leave_solict(ifa->idev, &ifa->addr);
+ }
+
+ write_lock_bh(&idev->lock);
+ if (!keep) {
+ list_del_rcu(&ifa->if_list);
+ in6_ifa_put(ifa);
+ }
+ }
+
+ write_unlock_bh(&idev->lock);
+
+ /* Step 5: Discard anycast and multicast list */
+ if (how) {
+ ipv6_ac_destroy_dev(idev);
+ ipv6_mc_destroy_dev(idev);
+ } else {
+ ipv6_mc_down(idev);
+ }
+
+ idev->tstamp = jiffies;
+
+ /* Last: Shot the device (if unregistered) */
+ if (how) {
+ addrconf_sysctl_unregister(idev);
+ neigh_parms_release(&nd_tbl, idev->nd_parms);
+ neigh_ifdown(&nd_tbl, dev);
+ in6_dev_put(idev);
+ }
+ return 0;
+}
+
+static void addrconf_rs_timer(struct timer_list *t)
+{
+ struct inet6_dev *idev = from_timer(idev, t, rs_timer);
+ struct net_device *dev = idev->dev;
+ struct in6_addr lladdr;
+
+ write_lock(&idev->lock);
+ if (idev->dead || !(idev->if_flags & IF_READY))
+ goto out;
+
+ if (!ipv6_accept_ra(idev))
+ goto out;
+
+ /* Announcement received after solicitation was sent */
+ if (idev->if_flags & IF_RA_RCVD)
+ goto out;
+
+ if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
+ write_unlock(&idev->lock);
+ if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
+ ndisc_send_rs(dev, &lladdr,
+ &in6addr_linklocal_allrouters);
+ else
+ goto put;
+
+ write_lock(&idev->lock);
+ idev->rs_interval = rfc3315_s14_backoff_update(
+ idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
+ /* The wait after the last probe can be shorter */
+ addrconf_mod_rs_timer(idev, (idev->rs_probes ==
+ idev->cnf.rtr_solicits) ?
+ idev->cnf.rtr_solicit_delay :
+ idev->rs_interval);
+ } else {
+ /*
+ * Note: we do not support deprecated "all on-link"
+ * assumption any longer.
+ */
+ pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
+ }
+
+out:
+ write_unlock(&idev->lock);
+put:
+ in6_dev_put(idev);
+}
+
+/*
+ * Duplicate Address Detection
+ */
+static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
+{
+ unsigned long rand_num;
+ struct inet6_dev *idev = ifp->idev;
+ u64 nonce;
+
+ if (ifp->flags & IFA_F_OPTIMISTIC)
+ rand_num = 0;
+ else
+ rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
+
+ nonce = 0;
+ if (idev->cnf.enhanced_dad ||
+ dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
+ do
+ get_random_bytes(&nonce, 6);
+ while (nonce == 0);
+ }
+ ifp->dad_nonce = nonce;
+ ifp->dad_probes = idev->cnf.dad_transmits;
+ addrconf_mod_dad_work(ifp, rand_num);
+}
+
+static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
+{
+ struct inet6_dev *idev = ifp->idev;
+ struct net_device *dev = idev->dev;
+ bool bump_id, notify = false;
+ struct net *net;
+
+ addrconf_join_solict(dev, &ifp->addr);
+
+ prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
+
+ read_lock_bh(&idev->lock);
+ spin_lock(&ifp->lock);
+ if (ifp->state == INET6_IFADDR_STATE_DEAD)
+ goto out;
+
+ net = dev_net(dev);
+ if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
+ (net->ipv6.devconf_all->accept_dad < 1 &&
+ idev->cnf.accept_dad < 1) ||
+ !(ifp->flags&IFA_F_TENTATIVE) ||
+ ifp->flags & IFA_F_NODAD) {
+ bool send_na = false;
+
+ if (ifp->flags & IFA_F_TENTATIVE &&
+ !(ifp->flags & IFA_F_OPTIMISTIC))
+ send_na = true;
+ bump_id = ifp->flags & IFA_F_TENTATIVE;
+ ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
+ spin_unlock(&ifp->lock);
+ read_unlock_bh(&idev->lock);
+
+ addrconf_dad_completed(ifp, bump_id, send_na);
+ return;
+ }
+
+ if (!(idev->if_flags & IF_READY)) {
+ spin_unlock(&ifp->lock);
+ read_unlock_bh(&idev->lock);
+ /*
+ * If the device is not ready:
+ * - keep it tentative if it is a permanent address.
+ * - otherwise, kill it.
+ */
+ in6_ifa_hold(ifp);
+ addrconf_dad_stop(ifp, 0);
+ return;
+ }
+
+ /*
+ * Optimistic nodes can start receiving
+ * Frames right away
+ */
+ if (ifp->flags & IFA_F_OPTIMISTIC) {
+ ip6_ins_rt(net, ifp->rt);
+ if (ipv6_use_optimistic_addr(net, idev)) {
+ /* Because optimistic nodes can use this address,
+ * notify listeners. If DAD fails, RTM_DELADDR is sent.
+ */
+ notify = true;
+ }
+ }
+
+ addrconf_dad_kick(ifp);
+out:
+ spin_unlock(&ifp->lock);
+ read_unlock_bh(&idev->lock);
+ if (notify)
+ ipv6_ifa_notify(RTM_NEWADDR, ifp);
+}
+
+static void addrconf_dad_start(struct inet6_ifaddr *ifp)
+{
+ bool begin_dad = false;
+
+ spin_lock_bh(&ifp->lock);
+ if (ifp->state != INET6_IFADDR_STATE_DEAD) {
+ ifp->state = INET6_IFADDR_STATE_PREDAD;
+ begin_dad = true;
+ }
+ spin_unlock_bh(&ifp->lock);
+
+ if (begin_dad)
+ addrconf_mod_dad_work(ifp, 0);
+}
+
+static void addrconf_dad_work(struct work_struct *w)
+{
+ struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
+ struct inet6_ifaddr,
+ dad_work);
+ struct inet6_dev *idev = ifp->idev;
+ bool bump_id, disable_ipv6 = false;
+ struct in6_addr mcaddr;
+
+ enum {
+ DAD_PROCESS,
+ DAD_BEGIN,
+ DAD_ABORT,
+ } action = DAD_PROCESS;
+
+ rtnl_lock();
+
+ spin_lock_bh(&ifp->lock);
+ if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
+ action = DAD_BEGIN;
+ ifp->state = INET6_IFADDR_STATE_DAD;
+ } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
+ action = DAD_ABORT;
+ ifp->state = INET6_IFADDR_STATE_POSTDAD;
+
+ if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
+ idev->cnf.accept_dad > 1) &&
+ !idev->cnf.disable_ipv6 &&
+ !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
+ struct in6_addr addr;
+
+ addr.s6_addr32[0] = htonl(0xfe800000);
+ addr.s6_addr32[1] = 0;
+
+ if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
+ ipv6_addr_equal(&ifp->addr, &addr)) {
+ /* DAD failed for link-local based on MAC */
+ idev->cnf.disable_ipv6 = 1;
+
+ pr_info("%s: IPv6 being disabled!\n",
+ ifp->idev->dev->name);
+ disable_ipv6 = true;
+ }
+ }
+ }
+ spin_unlock_bh(&ifp->lock);
+
+ if (action == DAD_BEGIN) {
+ addrconf_dad_begin(ifp);
+ goto out;
+ } else if (action == DAD_ABORT) {
+ in6_ifa_hold(ifp);
+ addrconf_dad_stop(ifp, 1);
+ if (disable_ipv6)
+ addrconf_ifdown(idev->dev, 0);
+ goto out;
+ }
+
+ if (!ifp->dad_probes && addrconf_dad_end(ifp))
+ goto out;
+
+ write_lock_bh(&idev->lock);
+ if (idev->dead || !(idev->if_flags & IF_READY)) {
+ write_unlock_bh(&idev->lock);
+ goto out;
+ }
+
+ spin_lock(&ifp->lock);
+ if (ifp->state == INET6_IFADDR_STATE_DEAD) {
+ spin_unlock(&ifp->lock);
+ write_unlock_bh(&idev->lock);
+ goto out;
+ }
+
+ if (ifp->dad_probes == 0) {
+ bool send_na = false;
+
+ /*
+ * DAD was successful
+ */
+
+ if (ifp->flags & IFA_F_TENTATIVE &&
+ !(ifp->flags & IFA_F_OPTIMISTIC))
+ send_na = true;
+ bump_id = ifp->flags & IFA_F_TENTATIVE;
+ ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
+ spin_unlock(&ifp->lock);
+ write_unlock_bh(&idev->lock);
+
+ addrconf_dad_completed(ifp, bump_id, send_na);
+
+ goto out;
+ }
+
+ ifp->dad_probes--;
+ addrconf_mod_dad_work(ifp,
+ NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
+ spin_unlock(&ifp->lock);
+ write_unlock_bh(&idev->lock);
+
+ /* send a neighbour solicitation for our addr */
+ addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
+ ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
+ ifp->dad_nonce);
+out:
+ in6_ifa_put(ifp);
+ rtnl_unlock();
+}
+
+/* ifp->idev must be at least read locked */
+static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
+{
+ struct inet6_ifaddr *ifpiter;
+ struct inet6_dev *idev = ifp->idev;
+
+ list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
+ if (ifpiter->scope > IFA_LINK)
+ break;
+ if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
+ (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
+ IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
+ IFA_F_PERMANENT)
+ return false;
+ }
+ return true;
+}
+
+static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
+ bool send_na)
+{
+ struct net_device *dev = ifp->idev->dev;
+ struct in6_addr lladdr;
+ bool send_rs, send_mld;
+
+ addrconf_del_dad_work(ifp);
+
+ /*
+ * Configure the address for reception. Now it is valid.
+ */
+
+ ipv6_ifa_notify(RTM_NEWADDR, ifp);
+
+ /* If added prefix is link local and we are prepared to process
+ router advertisements, start sending router solicitations.
+ */
+
+ read_lock_bh(&ifp->idev->lock);
+ send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
+ send_rs = send_mld &&
+ ipv6_accept_ra(ifp->idev) &&
+ ifp->idev->cnf.rtr_solicits != 0 &&
+ (dev->flags&IFF_LOOPBACK) == 0;
+ read_unlock_bh(&ifp->idev->lock);
+
+ /* While dad is in progress mld report's source address is in6_addrany.
+ * Resend with proper ll now.
+ */
+ if (send_mld)
+ ipv6_mc_dad_complete(ifp->idev);
+
+ /* send unsolicited NA if enabled */
+ if (send_na &&
+ (ifp->idev->cnf.ndisc_notify ||
+ dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
+ ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
+ /*router=*/ !!ifp->idev->cnf.forwarding,
+ /*solicited=*/ false, /*override=*/ true,
+ /*inc_opt=*/ true);
+ }
+
+ if (send_rs) {
+ /*
+ * If a host as already performed a random delay
+ * [...] as part of DAD [...] there is no need
+ * to delay again before sending the first RS
+ */
+ if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
+ return;
+ ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
+
+ write_lock_bh(&ifp->idev->lock);
+ spin_lock(&ifp->lock);
+ ifp->idev->rs_interval = rfc3315_s14_backoff_init(
+ ifp->idev->cnf.rtr_solicit_interval);
+ ifp->idev->rs_probes = 1;
+ ifp->idev->if_flags |= IF_RS_SENT;
+ addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
+ spin_unlock(&ifp->lock);
+ write_unlock_bh(&ifp->idev->lock);
+ }
+
+ if (bump_id)
+ rt_genid_bump_ipv6(dev_net(dev));
+
+ /* Make sure that a new temporary address will be created
+ * before this temporary address becomes deprecated.
+ */
+ if (ifp->flags & IFA_F_TEMPORARY)
+ addrconf_verify_rtnl();
+}
+
+static void addrconf_dad_run(struct inet6_dev *idev)
+{
+ struct inet6_ifaddr *ifp;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(ifp, &idev->addr_list, if_list) {
+ spin_lock(&ifp->lock);
+ if (ifp->flags & IFA_F_TENTATIVE &&
+ ifp->state == INET6_IFADDR_STATE_DAD)
+ addrconf_dad_kick(ifp);
+ spin_unlock(&ifp->lock);
+ }
+ read_unlock_bh(&idev->lock);
+}
+
+#ifdef CONFIG_PROC_FS
+struct if6_iter_state {
+ struct seq_net_private p;
+ int bucket;
+ int offset;
+};
+
+static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
+{
+ struct if6_iter_state *state = seq->private;
+ struct net *net = seq_file_net(seq);
+ struct inet6_ifaddr *ifa = NULL;
+ int p = 0;
+
+ /* initial bucket if pos is 0 */
+ if (pos == 0) {
+ state->bucket = 0;
+ state->offset = 0;
+ }
+
+ for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
+ hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
+ addr_lst) {
+ if (!net_eq(dev_net(ifa->idev->dev), net))
+ continue;
+ /* sync with offset */
+ if (p < state->offset) {
+ p++;
+ continue;
+ }
+ return ifa;
+ }
+
+ /* prepare for next bucket */
+ state->offset = 0;
+ p = 0;
+ }
+ return NULL;
+}
+
+static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
+ struct inet6_ifaddr *ifa)
+{
+ struct if6_iter_state *state = seq->private;
+ struct net *net = seq_file_net(seq);
+
+ hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
+ if (!net_eq(dev_net(ifa->idev->dev), net))
+ continue;
+ state->offset++;
+ return ifa;
+ }
+
+ state->offset = 0;
+ while (++state->bucket < IN6_ADDR_HSIZE) {
+ hlist_for_each_entry_rcu(ifa,
+ &inet6_addr_lst[state->bucket], addr_lst) {
+ if (!net_eq(dev_net(ifa->idev->dev), net))
+ continue;
+ return ifa;
+ }
+ }
+
+ return NULL;
+}
+
+static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(rcu)
+{
+ rcu_read_lock();
+ return if6_get_first(seq, *pos);
+}
+
+static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct inet6_ifaddr *ifa;
+
+ ifa = if6_get_next(seq, v);
+ ++*pos;
+ return ifa;
+}
+
+static void if6_seq_stop(struct seq_file *seq, void *v)
+ __releases(rcu)
+{
+ rcu_read_unlock();
+}
+
+static int if6_seq_show(struct seq_file *seq, void *v)
+{
+ struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
+ seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
+ &ifp->addr,
+ ifp->idev->dev->ifindex,
+ ifp->prefix_len,
+ ifp->scope,
+ (u8) ifp->flags,
+ ifp->idev->dev->name);
+ return 0;
+}
+
+static const struct seq_operations if6_seq_ops = {
+ .start = if6_seq_start,
+ .next = if6_seq_next,
+ .show = if6_seq_show,
+ .stop = if6_seq_stop,
+};
+
+static int __net_init if6_proc_net_init(struct net *net)
+{
+ if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
+ sizeof(struct if6_iter_state)))
+ return -ENOMEM;
+ return 0;
+}
+
+static void __net_exit if6_proc_net_exit(struct net *net)
+{
+ remove_proc_entry("if_inet6", net->proc_net);
+}
+
+static struct pernet_operations if6_proc_net_ops = {
+ .init = if6_proc_net_init,
+ .exit = if6_proc_net_exit,
+};
+
+int __init if6_proc_init(void)
+{
+ return register_pernet_subsys(&if6_proc_net_ops);
+}
+
+void if6_proc_exit(void)
+{
+ unregister_pernet_subsys(&if6_proc_net_ops);
+}
+#endif /* CONFIG_PROC_FS */
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+/* Check if address is a home address configured on any interface. */
+int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
+{
+ unsigned int hash = inet6_addr_hash(net, addr);
+ struct inet6_ifaddr *ifp = NULL;
+ int ret = 0;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
+ if (!net_eq(dev_net(ifp->idev->dev), net))
+ continue;
+ if (ipv6_addr_equal(&ifp->addr, addr) &&
+ (ifp->flags & IFA_F_HOMEADDRESS)) {
+ ret = 1;
+ break;
+ }
+ }
+ rcu_read_unlock();
+ return ret;
+}
+#endif
+
+/*
+ * Periodic address status verification
+ */
+
+static void addrconf_verify_rtnl(void)
+{
+ unsigned long now, next, next_sec, next_sched;
+ struct inet6_ifaddr *ifp;
+ int i;
+
+ ASSERT_RTNL();
+
+ rcu_read_lock_bh();
+ now = jiffies;
+ next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
+
+ cancel_delayed_work(&addr_chk_work);
+
+ for (i = 0; i < IN6_ADDR_HSIZE; i++) {
+restart:
+ hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
+ unsigned long age;
+
+ /* When setting preferred_lft to a value not zero or
+ * infinity, while valid_lft is infinity
+ * IFA_F_PERMANENT has a non-infinity life time.
+ */
+ if ((ifp->flags & IFA_F_PERMANENT) &&
+ (ifp->prefered_lft == INFINITY_LIFE_TIME))
+ continue;
+
+ spin_lock(&ifp->lock);
+ /* We try to batch several events at once. */
+ age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+
+ if (ifp->valid_lft != INFINITY_LIFE_TIME &&
+ age >= ifp->valid_lft) {
+ spin_unlock(&ifp->lock);
+ in6_ifa_hold(ifp);
+ ipv6_del_addr(ifp);
+ goto restart;
+ } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
+ spin_unlock(&ifp->lock);
+ continue;
+ } else if (age >= ifp->prefered_lft) {
+ /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
+ int deprecate = 0;
+
+ if (!(ifp->flags&IFA_F_DEPRECATED)) {
+ deprecate = 1;
+ ifp->flags |= IFA_F_DEPRECATED;
+ }
+
+ if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
+ (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
+ next = ifp->tstamp + ifp->valid_lft * HZ;
+
+ spin_unlock(&ifp->lock);
+
+ if (deprecate) {
+ in6_ifa_hold(ifp);
+
+ ipv6_ifa_notify(0, ifp);
+ in6_ifa_put(ifp);
+ goto restart;
+ }
+ } else if ((ifp->flags&IFA_F_TEMPORARY) &&
+ !(ifp->flags&IFA_F_TENTATIVE)) {
+ unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
+ ifp->idev->cnf.dad_transmits *
+ NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
+
+ if (age >= ifp->prefered_lft - regen_advance) {
+ struct inet6_ifaddr *ifpub = ifp->ifpub;
+ if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
+ next = ifp->tstamp + ifp->prefered_lft * HZ;
+ if (!ifp->regen_count && ifpub) {
+ ifp->regen_count++;
+ in6_ifa_hold(ifp);
+ in6_ifa_hold(ifpub);
+ spin_unlock(&ifp->lock);
+
+ spin_lock(&ifpub->lock);
+ ifpub->regen_count = 0;
+ spin_unlock(&ifpub->lock);
+ rcu_read_unlock_bh();
+ ipv6_create_tempaddr(ifpub, ifp, true);
+ in6_ifa_put(ifpub);
+ in6_ifa_put(ifp);
+ rcu_read_lock_bh();
+ goto restart;
+ }
+ } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
+ next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
+ spin_unlock(&ifp->lock);
+ } else {
+ /* ifp->prefered_lft <= ifp->valid_lft */
+ if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
+ next = ifp->tstamp + ifp->prefered_lft * HZ;
+ spin_unlock(&ifp->lock);
+ }
+ }
+ }
+
+ next_sec = round_jiffies_up(next);
+ next_sched = next;
+
+ /* If rounded timeout is accurate enough, accept it. */
+ if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
+ next_sched = next_sec;
+
+ /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
+ if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
+ next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
+
+ pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
+ now, next, next_sec, next_sched);
+ mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
+ rcu_read_unlock_bh();
+}
+
+static void addrconf_verify_work(struct work_struct *w)
+{
+ rtnl_lock();
+ addrconf_verify_rtnl();
+ rtnl_unlock();
+}
+
+static void addrconf_verify(void)
+{
+ mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
+}
+
+static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
+ struct in6_addr **peer_pfx)
+{
+ struct in6_addr *pfx = NULL;
+
+ *peer_pfx = NULL;
+
+ if (addr)
+ pfx = nla_data(addr);
+
+ if (local) {
+ if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
+ *peer_pfx = pfx;
+ pfx = nla_data(local);
+ }
+
+ return pfx;
+}
+
+static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
+ [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
+ [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
+ [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
+ [IFA_FLAGS] = { .len = sizeof(u32) },
+ [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
+};
+
+static int
+inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct ifaddrmsg *ifm;
+ struct nlattr *tb[IFA_MAX+1];
+ struct in6_addr *pfx, *peer_pfx;
+ u32 ifa_flags;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
+ extack);
+ if (err < 0)
+ return err;
+
+ ifm = nlmsg_data(nlh);
+ pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
+ if (!pfx)
+ return -EINVAL;
+
+ ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
+
+ /* We ignore other flags so far. */
+ ifa_flags &= IFA_F_MANAGETEMPADDR;
+
+ return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
+ ifm->ifa_prefixlen);
+}
+
+static int modify_prefix_route(struct inet6_ifaddr *ifp,
+ unsigned long expires, u32 flags)
+{
+ struct fib6_info *f6i;
+ u32 prio;
+
+ f6i = addrconf_get_prefix_route(&ifp->addr,
+ ifp->prefix_len,
+ ifp->idev->dev,
+ 0, RTF_GATEWAY | RTF_DEFAULT);
+ if (!f6i)
+ return -ENOENT;
+
+ prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
+ if (f6i->fib6_metric != prio) {
+ /* delete old one */
+ ip6_del_rt(dev_net(ifp->idev->dev), f6i);
+
+ /* add new one */
+ addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
+ ifp->rt_priority, ifp->idev->dev,
+ expires, flags, GFP_KERNEL);
+ } else {
+ if (!expires)
+ fib6_clean_expires(f6i);
+ else
+ fib6_set_expires(f6i, expires);
+
+ fib6_info_release(f6i);
+ }
+
+ return 0;
+}
+
+static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
+{
+ u32 flags;
+ clock_t expires;
+ unsigned long timeout;
+ bool was_managetempaddr;
+ bool had_prefixroute;
+
+ ASSERT_RTNL();
+
+ if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
+ return -EINVAL;
+
+ if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
+ (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
+ return -EINVAL;
+
+ if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
+ cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
+
+ timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
+ if (addrconf_finite_timeout(timeout)) {
+ expires = jiffies_to_clock_t(timeout * HZ);
+ cfg->valid_lft = timeout;
+ flags = RTF_EXPIRES;
+ } else {
+ expires = 0;
+ flags = 0;
+ cfg->ifa_flags |= IFA_F_PERMANENT;
+ }
+
+ timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
+ if (addrconf_finite_timeout(timeout)) {
+ if (timeout == 0)
+ cfg->ifa_flags |= IFA_F_DEPRECATED;
+ cfg->preferred_lft = timeout;
+ }
+
+ spin_lock_bh(&ifp->lock);
+ was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
+ had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
+ !(ifp->flags & IFA_F_NOPREFIXROUTE);
+ ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
+ IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
+ IFA_F_NOPREFIXROUTE);
+ ifp->flags |= cfg->ifa_flags;
+ ifp->tstamp = jiffies;
+ ifp->valid_lft = cfg->valid_lft;
+ ifp->prefered_lft = cfg->preferred_lft;
+
+ if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
+ ifp->rt_priority = cfg->rt_priority;
+
+ spin_unlock_bh(&ifp->lock);
+ if (!(ifp->flags&IFA_F_TENTATIVE))
+ ipv6_ifa_notify(0, ifp);
+
+ if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
+ int rc = -ENOENT;
+
+ if (had_prefixroute)
+ rc = modify_prefix_route(ifp, expires, flags);
+
+ /* prefix route could have been deleted; if so restore it */
+ if (rc == -ENOENT) {
+ addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
+ ifp->rt_priority, ifp->idev->dev,
+ expires, flags, GFP_KERNEL);
+ }
+ } else if (had_prefixroute) {
+ enum cleanup_prefix_rt_t action;
+ unsigned long rt_expires;
+
+ write_lock_bh(&ifp->idev->lock);
+ action = check_cleanup_prefix_route(ifp, &rt_expires);
+ write_unlock_bh(&ifp->idev->lock);
+
+ if (action != CLEANUP_PREFIX_RT_NOP) {
+ cleanup_prefix_route(ifp, rt_expires,
+ action == CLEANUP_PREFIX_RT_DEL);
+ }
+ }
+
+ if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
+ if (was_managetempaddr &&
+ !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
+ cfg->valid_lft = 0;
+ cfg->preferred_lft = 0;
+ }
+ manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
+ cfg->preferred_lft, !was_managetempaddr,
+ jiffies);
+ }
+
+ addrconf_verify_rtnl();
+
+ return 0;
+}
+
+static int
+inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct ifaddrmsg *ifm;
+ struct nlattr *tb[IFA_MAX+1];
+ struct in6_addr *peer_pfx;
+ struct inet6_ifaddr *ifa;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+ struct ifa6_config cfg;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
+ extack);
+ if (err < 0)
+ return err;
+
+ memset(&cfg, 0, sizeof(cfg));
+
+ ifm = nlmsg_data(nlh);
+ cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
+ if (!cfg.pfx)
+ return -EINVAL;
+
+ cfg.peer_pfx = peer_pfx;
+ cfg.plen = ifm->ifa_prefixlen;
+ if (tb[IFA_RT_PRIORITY])
+ cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
+
+ cfg.valid_lft = INFINITY_LIFE_TIME;
+ cfg.preferred_lft = INFINITY_LIFE_TIME;
+
+ if (tb[IFA_CACHEINFO]) {
+ struct ifa_cacheinfo *ci;
+
+ ci = nla_data(tb[IFA_CACHEINFO]);
+ cfg.valid_lft = ci->ifa_valid;
+ cfg.preferred_lft = ci->ifa_prefered;
+ }
+
+ dev = __dev_get_by_index(net, ifm->ifa_index);
+ if (!dev)
+ return -ENODEV;
+
+ if (tb[IFA_FLAGS])
+ cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
+ else
+ cfg.ifa_flags = ifm->ifa_flags;
+
+ /* We ignore other flags so far. */
+ cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
+ IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
+ IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
+
+ idev = ipv6_find_idev(dev);
+ if (IS_ERR(idev))
+ return PTR_ERR(idev);
+
+ if (!ipv6_allow_optimistic_dad(net, idev))
+ cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
+
+ if (cfg.ifa_flags & IFA_F_NODAD &&
+ cfg.ifa_flags & IFA_F_OPTIMISTIC) {
+ NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
+ return -EINVAL;
+ }
+
+ ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
+ if (!ifa) {
+ /*
+ * It would be best to check for !NLM_F_CREATE here but
+ * userspace already relies on not having to provide this.
+ */
+ return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
+ }
+
+ if (nlh->nlmsg_flags & NLM_F_EXCL ||
+ !(nlh->nlmsg_flags & NLM_F_REPLACE))
+ err = -EEXIST;
+ else
+ err = inet6_addr_modify(ifa, &cfg);
+
+ in6_ifa_put(ifa);
+
+ return err;
+}
+
+static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
+ u8 scope, int ifindex)
+{
+ struct ifaddrmsg *ifm;
+
+ ifm = nlmsg_data(nlh);
+ ifm->ifa_family = AF_INET6;
+ ifm->ifa_prefixlen = prefixlen;
+ ifm->ifa_flags = flags;
+ ifm->ifa_scope = scope;
+ ifm->ifa_index = ifindex;
+}
+
+static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
+ unsigned long tstamp, u32 preferred, u32 valid)
+{
+ struct ifa_cacheinfo ci;
+
+ ci.cstamp = cstamp_delta(cstamp);
+ ci.tstamp = cstamp_delta(tstamp);
+ ci.ifa_prefered = preferred;
+ ci.ifa_valid = valid;
+
+ return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
+}
+
+static inline int rt_scope(int ifa_scope)
+{
+ if (ifa_scope & IFA_HOST)
+ return RT_SCOPE_HOST;
+ else if (ifa_scope & IFA_LINK)
+ return RT_SCOPE_LINK;
+ else if (ifa_scope & IFA_SITE)
+ return RT_SCOPE_SITE;
+ else
+ return RT_SCOPE_UNIVERSE;
+}
+
+static inline int inet6_ifaddr_msgsize(void)
+{
+ return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
+ + nla_total_size(16) /* IFA_LOCAL */
+ + nla_total_size(16) /* IFA_ADDRESS */
+ + nla_total_size(sizeof(struct ifa_cacheinfo))
+ + nla_total_size(4) /* IFA_FLAGS */
+ + nla_total_size(4) /* IFA_RT_PRIORITY */;
+}
+
+static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
+ u32 portid, u32 seq, int event, unsigned int flags)
+{
+ struct nlmsghdr *nlh;
+ u32 preferred, valid;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
+ ifa->idev->dev->ifindex);
+
+ if (!((ifa->flags&IFA_F_PERMANENT) &&
+ (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
+ preferred = ifa->prefered_lft;
+ valid = ifa->valid_lft;
+ if (preferred != INFINITY_LIFE_TIME) {
+ long tval = (jiffies - ifa->tstamp)/HZ;
+ if (preferred > tval)
+ preferred -= tval;
+ else
+ preferred = 0;
+ if (valid != INFINITY_LIFE_TIME) {
+ if (valid > tval)
+ valid -= tval;
+ else
+ valid = 0;
+ }
+ }
+ } else {
+ preferred = INFINITY_LIFE_TIME;
+ valid = INFINITY_LIFE_TIME;
+ }
+
+ if (!ipv6_addr_any(&ifa->peer_addr)) {
+ if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
+ nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
+ goto error;
+ } else
+ if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
+ goto error;
+
+ if (ifa->rt_priority &&
+ nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
+ goto error;
+
+ if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
+ goto error;
+
+ if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
+ goto error;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+error:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
+ u32 portid, u32 seq, int event, u16 flags)
+{
+ struct nlmsghdr *nlh;
+ u8 scope = RT_SCOPE_UNIVERSE;
+ int ifindex = ifmca->idev->dev->ifindex;
+
+ if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
+ scope = RT_SCOPE_SITE;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
+ if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
+ put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
+ INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+ }
+
+ nlmsg_end(skb, nlh);
+ return 0;
+}
+
+static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
+ u32 portid, u32 seq, int event, unsigned int flags)
+{
+ struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
+ int ifindex = dev ? dev->ifindex : 1;
+ struct nlmsghdr *nlh;
+ u8 scope = RT_SCOPE_UNIVERSE;
+
+ if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
+ scope = RT_SCOPE_SITE;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
+ if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
+ put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
+ INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+ }
+
+ nlmsg_end(skb, nlh);
+ return 0;
+}
+
+enum addr_type_t {
+ UNICAST_ADDR,
+ MULTICAST_ADDR,
+ ANYCAST_ADDR,
+};
+
+/* called with rcu_read_lock() */
+static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
+ struct netlink_callback *cb, enum addr_type_t type,
+ int s_ip_idx, int *p_ip_idx)
+{
+ struct ifmcaddr6 *ifmca;
+ struct ifacaddr6 *ifaca;
+ int err = 1;
+ int ip_idx = *p_ip_idx;
+
+ read_lock_bh(&idev->lock);
+ switch (type) {
+ case UNICAST_ADDR: {
+ struct inet6_ifaddr *ifa;
+
+ /* unicast address incl. temp addr */
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ if (ip_idx < s_ip_idx)
+ goto next;
+ err = inet6_fill_ifaddr(skb, ifa,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWADDR,
+ NLM_F_MULTI);
+ if (err < 0)
+ break;
+ nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+next:
+ ip_idx++;
+ }
+ break;
+ }
+ case MULTICAST_ADDR:
+ /* multicast address */
+ for (ifmca = idev->mc_list; ifmca;
+ ifmca = ifmca->next, ip_idx++) {
+ if (ip_idx < s_ip_idx)
+ continue;
+ err = inet6_fill_ifmcaddr(skb, ifmca,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_GETMULTICAST,
+ NLM_F_MULTI);
+ if (err < 0)
+ break;
+ }
+ break;
+ case ANYCAST_ADDR:
+ /* anycast address */
+ for (ifaca = idev->ac_list; ifaca;
+ ifaca = ifaca->aca_next, ip_idx++) {
+ if (ip_idx < s_ip_idx)
+ continue;
+ err = inet6_fill_ifacaddr(skb, ifaca,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_GETANYCAST,
+ NLM_F_MULTI);
+ if (err < 0)
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ read_unlock_bh(&idev->lock);
+ *p_ip_idx = ip_idx;
+ return err;
+}
+
+static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
+ enum addr_type_t type)
+{
+ struct net *net = sock_net(skb->sk);
+ int h, s_h;
+ int idx, ip_idx;
+ int s_idx, s_ip_idx;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+ struct hlist_head *head;
+
+ s_h = cb->args[0];
+ s_idx = idx = cb->args[1];
+ s_ip_idx = ip_idx = cb->args[2];
+
+ rcu_read_lock();
+ cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
+ for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+ idx = 0;
+ head = &net->dev_index_head[h];
+ hlist_for_each_entry_rcu(dev, head, index_hlist) {
+ if (idx < s_idx)
+ goto cont;
+ if (h > s_h || idx > s_idx)
+ s_ip_idx = 0;
+ ip_idx = 0;
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ goto cont;
+
+ if (in6_dump_addrs(idev, skb, cb, type,
+ s_ip_idx, &ip_idx) < 0)
+ goto done;
+cont:
+ idx++;
+ }
+ }
+done:
+ rcu_read_unlock();
+ cb->args[0] = h;
+ cb->args[1] = idx;
+ cb->args[2] = ip_idx;
+
+ return skb->len;
+}
+
+static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ enum addr_type_t type = UNICAST_ADDR;
+
+ return inet6_dump_addr(skb, cb, type);
+}
+
+static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ enum addr_type_t type = MULTICAST_ADDR;
+
+ return inet6_dump_addr(skb, cb, type);
+}
+
+
+static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ enum addr_type_t type = ANYCAST_ADDR;
+
+ return inet6_dump_addr(skb, cb, type);
+}
+
+static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct ifaddrmsg *ifm;
+ struct nlattr *tb[IFA_MAX+1];
+ struct in6_addr *addr = NULL, *peer;
+ struct net_device *dev = NULL;
+ struct inet6_ifaddr *ifa;
+ struct sk_buff *skb;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
+ extack);
+ if (err < 0)
+ return err;
+
+ addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
+ if (!addr)
+ return -EINVAL;
+
+ ifm = nlmsg_data(nlh);
+ if (ifm->ifa_index)
+ dev = dev_get_by_index(net, ifm->ifa_index);
+
+ ifa = ipv6_get_ifaddr(net, addr, dev, 1);
+ if (!ifa) {
+ err = -EADDRNOTAVAIL;
+ goto errout;
+ }
+
+ skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
+ if (!skb) {
+ err = -ENOBUFS;
+ goto errout_ifa;
+ }
+
+ err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, RTM_NEWADDR, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout_ifa;
+ }
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+errout_ifa:
+ in6_ifa_put(ifa);
+errout:
+ if (dev)
+ dev_put(dev);
+ return err;
+}
+
+static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
+{
+ struct sk_buff *skb;
+ struct net *net = dev_net(ifa->idev->dev);
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
+}
+
+static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
+ __s32 *array, int bytes)
+{
+ BUG_ON(bytes < (DEVCONF_MAX * 4));
+
+ memset(array, 0, bytes);
+ array[DEVCONF_FORWARDING] = cnf->forwarding;
+ array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
+ array[DEVCONF_MTU6] = cnf->mtu6;
+ array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
+ array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
+ array[DEVCONF_AUTOCONF] = cnf->autoconf;
+ array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
+ array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
+ array[DEVCONF_RTR_SOLICIT_INTERVAL] =
+ jiffies_to_msecs(cnf->rtr_solicit_interval);
+ array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
+ jiffies_to_msecs(cnf->rtr_solicit_max_interval);
+ array[DEVCONF_RTR_SOLICIT_DELAY] =
+ jiffies_to_msecs(cnf->rtr_solicit_delay);
+ array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
+ array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
+ jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
+ array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
+ jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
+ array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
+ array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
+ array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
+ array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
+ array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
+ array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
+ array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
+ array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
+ array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
+ array[DEVCONF_RTR_PROBE_INTERVAL] =
+ jiffies_to_msecs(cnf->rtr_probe_interval);
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
+ array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
+#endif
+#endif
+ array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
+ array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
+ array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
+#endif
+#ifdef CONFIG_IPV6_MROUTE
+ array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
+#endif
+ array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
+ array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
+ array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
+ array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
+ array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
+ array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
+ array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
+ array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
+ /* we omit DEVCONF_STABLE_SECRET for now */
+ array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
+ array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
+ array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
+ array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
+ array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
+#endif
+ array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
+ array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
+ array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
+ array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
+}
+
+static inline size_t inet6_ifla6_size(void)
+{
+ return nla_total_size(4) /* IFLA_INET6_FLAGS */
+ + nla_total_size(sizeof(struct ifla_cacheinfo))
+ + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
+ + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
+ + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
+ + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
+ + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
+ + 0;
+}
+
+static inline size_t inet6_if_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+ + nla_total_size(4) /* IFLA_MTU */
+ + nla_total_size(4) /* IFLA_LINK */
+ + nla_total_size(1) /* IFLA_OPERSTATE */
+ + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
+}
+
+static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
+ int bytes)
+{
+ int i;
+ int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
+ BUG_ON(pad < 0);
+
+ /* Use put_unaligned() because stats may not be aligned for u64. */
+ put_unaligned(ICMP6_MIB_MAX, &stats[0]);
+ for (i = 1; i < ICMP6_MIB_MAX; i++)
+ put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
+
+ memset(&stats[ICMP6_MIB_MAX], 0, pad);
+}
+
+static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
+ int bytes, size_t syncpoff)
+{
+ int i, c;
+ u64 buff[IPSTATS_MIB_MAX];
+ int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
+
+ BUG_ON(pad < 0);
+
+ memset(buff, 0, sizeof(buff));
+ buff[0] = IPSTATS_MIB_MAX;
+
+ for_each_possible_cpu(c) {
+ for (i = 1; i < IPSTATS_MIB_MAX; i++)
+ buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
+ }
+
+ memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
+ memset(&stats[IPSTATS_MIB_MAX], 0, pad);
+}
+
+static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
+ int bytes)
+{
+ switch (attrtype) {
+ case IFLA_INET6_STATS:
+ __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
+ offsetof(struct ipstats_mib, syncp));
+ break;
+ case IFLA_INET6_ICMP6STATS:
+ __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
+ break;
+ }
+}
+
+static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
+ u32 ext_filter_mask)
+{
+ struct nlattr *nla;
+ struct ifla_cacheinfo ci;
+
+ if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
+ goto nla_put_failure;
+ ci.max_reasm_len = IPV6_MAXPLEN;
+ ci.tstamp = cstamp_delta(idev->tstamp);
+ ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
+ ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
+ if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
+ goto nla_put_failure;
+ nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
+ if (!nla)
+ goto nla_put_failure;
+ ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
+
+ /* XXX - MC not implemented */
+
+ if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
+ return 0;
+
+ nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
+ if (!nla)
+ goto nla_put_failure;
+ snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
+
+ nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
+ if (!nla)
+ goto nla_put_failure;
+ snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
+
+ nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
+ if (!nla)
+ goto nla_put_failure;
+
+ if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
+ goto nla_put_failure;
+
+ read_lock_bh(&idev->lock);
+ memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
+ read_unlock_bh(&idev->lock);
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static size_t inet6_get_link_af_size(const struct net_device *dev,
+ u32 ext_filter_mask)
+{
+ if (!__in6_dev_get(dev))
+ return 0;
+
+ return inet6_ifla6_size();
+}
+
+static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
+ u32 ext_filter_mask)
+{
+ struct inet6_dev *idev = __in6_dev_get(dev);
+
+ if (!idev)
+ return -ENODATA;
+
+ if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
+{
+ struct inet6_ifaddr *ifp;
+ struct net_device *dev = idev->dev;
+ bool clear_token, update_rs = false;
+ struct in6_addr ll_addr;
+
+ ASSERT_RTNL();
+
+ if (!token)
+ return -EINVAL;
+ if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
+ return -EINVAL;
+ if (!ipv6_accept_ra(idev))
+ return -EINVAL;
+ if (idev->cnf.rtr_solicits == 0)
+ return -EINVAL;
+
+ write_lock_bh(&idev->lock);
+
+ BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
+ memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
+
+ write_unlock_bh(&idev->lock);
+
+ clear_token = ipv6_addr_any(token);
+ if (clear_token)
+ goto update_lft;
+
+ if (!idev->dead && (idev->if_flags & IF_READY) &&
+ !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
+ IFA_F_OPTIMISTIC)) {
+ /* If we're not ready, then normal ifup will take care
+ * of this. Otherwise, we need to request our rs here.
+ */
+ ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
+ update_rs = true;
+ }
+
+update_lft:
+ write_lock_bh(&idev->lock);
+
+ if (update_rs) {
+ idev->if_flags |= IF_RS_SENT;
+ idev->rs_interval = rfc3315_s14_backoff_init(
+ idev->cnf.rtr_solicit_interval);
+ idev->rs_probes = 1;
+ addrconf_mod_rs_timer(idev, idev->rs_interval);
+ }
+
+ /* Well, that's kinda nasty ... */
+ list_for_each_entry(ifp, &idev->addr_list, if_list) {
+ spin_lock(&ifp->lock);
+ if (ifp->tokenized) {
+ ifp->valid_lft = 0;
+ ifp->prefered_lft = 0;
+ }
+ spin_unlock(&ifp->lock);
+ }
+
+ write_unlock_bh(&idev->lock);
+ inet6_ifinfo_notify(RTM_NEWLINK, idev);
+ addrconf_verify_rtnl();
+ return 0;
+}
+
+static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
+ [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
+ [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
+};
+
+static int inet6_validate_link_af(const struct net_device *dev,
+ const struct nlattr *nla)
+{
+ struct nlattr *tb[IFLA_INET6_MAX + 1];
+
+ if (dev && !__in6_dev_get(dev))
+ return -EAFNOSUPPORT;
+
+ return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
+ NULL);
+}
+
+static int check_addr_gen_mode(int mode)
+{
+ if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
+ mode != IN6_ADDR_GEN_MODE_NONE &&
+ mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
+ mode != IN6_ADDR_GEN_MODE_RANDOM)
+ return -EINVAL;
+ return 1;
+}
+
+static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
+ int mode)
+{
+ if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
+ !idev->cnf.stable_secret.initialized &&
+ !net->ipv6.devconf_dflt->stable_secret.initialized)
+ return -EINVAL;
+ return 1;
+}
+
+static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
+{
+ int err = -EINVAL;
+ struct inet6_dev *idev = __in6_dev_get(dev);
+ struct nlattr *tb[IFLA_INET6_MAX + 1];
+
+ if (!idev)
+ return -EAFNOSUPPORT;
+
+ if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
+ BUG();
+
+ if (tb[IFLA_INET6_TOKEN]) {
+ err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
+ if (err)
+ return err;
+ }
+
+ if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
+ u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
+
+ if (check_addr_gen_mode(mode) < 0 ||
+ check_stable_privacy(idev, dev_net(dev), mode) < 0)
+ return -EINVAL;
+
+ idev->cnf.addr_gen_mode = mode;
+ err = 0;
+ }
+
+ return err;
+}
+
+static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
+ u32 portid, u32 seq, int event, unsigned int flags)
+{
+ struct net_device *dev = idev->dev;
+ struct ifinfomsg *hdr;
+ struct nlmsghdr *nlh;
+ void *protoinfo;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ hdr = nlmsg_data(nlh);
+ hdr->ifi_family = AF_INET6;
+ hdr->__ifi_pad = 0;
+ hdr->ifi_type = dev->type;
+ hdr->ifi_index = dev->ifindex;
+ hdr->ifi_flags = dev_get_flags(dev);
+ hdr->ifi_change = 0;
+
+ if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
+ (dev->addr_len &&
+ nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
+ nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
+ (dev->ifindex != dev_get_iflink(dev) &&
+ nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
+ nla_put_u8(skb, IFLA_OPERSTATE,
+ netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
+ goto nla_put_failure;
+ protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
+ if (!protoinfo)
+ goto nla_put_failure;
+
+ if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
+ goto nla_put_failure;
+
+ nla_nest_end(skb, protoinfo);
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ int h, s_h;
+ int idx = 0, s_idx;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+ struct hlist_head *head;
+
+ s_h = cb->args[0];
+ s_idx = cb->args[1];
+
+ rcu_read_lock();
+ for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+ idx = 0;
+ head = &net->dev_index_head[h];
+ hlist_for_each_entry_rcu(dev, head, index_hlist) {
+ if (idx < s_idx)
+ goto cont;
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ goto cont;
+ if (inet6_fill_ifinfo(skb, idev,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWLINK, NLM_F_MULTI) < 0)
+ goto out;
+cont:
+ idx++;
+ }
+ }
+out:
+ rcu_read_unlock();
+ cb->args[1] = idx;
+ cb->args[0] = h;
+
+ return skb->len;
+}
+
+void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
+{
+ struct sk_buff *skb;
+ struct net *net = dev_net(idev->dev);
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
+}
+
+static inline size_t inet6_prefix_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct prefixmsg))
+ + nla_total_size(sizeof(struct in6_addr))
+ + nla_total_size(sizeof(struct prefix_cacheinfo));
+}
+
+static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
+ struct prefix_info *pinfo, u32 portid, u32 seq,
+ int event, unsigned int flags)
+{
+ struct prefixmsg *pmsg;
+ struct nlmsghdr *nlh;
+ struct prefix_cacheinfo ci;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ pmsg = nlmsg_data(nlh);
+ pmsg->prefix_family = AF_INET6;
+ pmsg->prefix_pad1 = 0;
+ pmsg->prefix_pad2 = 0;
+ pmsg->prefix_ifindex = idev->dev->ifindex;
+ pmsg->prefix_len = pinfo->prefix_len;
+ pmsg->prefix_type = pinfo->type;
+ pmsg->prefix_pad3 = 0;
+ pmsg->prefix_flags = 0;
+ if (pinfo->onlink)
+ pmsg->prefix_flags |= IF_PREFIX_ONLINK;
+ if (pinfo->autoconf)
+ pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
+
+ if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
+ goto nla_put_failure;
+ ci.preferred_time = ntohl(pinfo->prefered);
+ ci.valid_time = ntohl(pinfo->valid);
+ if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
+ goto nla_put_failure;
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static void inet6_prefix_notify(int event, struct inet6_dev *idev,
+ struct prefix_info *pinfo)
+{
+ struct sk_buff *skb;
+ struct net *net = dev_net(idev->dev);
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
+}
+
+static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
+{
+ struct net *net = dev_net(ifp->idev->dev);
+
+ if (event)
+ ASSERT_RTNL();
+
+ inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
+
+ switch (event) {
+ case RTM_NEWADDR:
+ /*
+ * If the address was optimistic
+ * we inserted the route at the start of
+ * our DAD process, so we don't need
+ * to do it again
+ */
+ if (!rcu_access_pointer(ifp->rt->fib6_node))
+ ip6_ins_rt(net, ifp->rt);
+ if (ifp->idev->cnf.forwarding)
+ addrconf_join_anycast(ifp);
+ if (!ipv6_addr_any(&ifp->peer_addr))
+ addrconf_prefix_route(&ifp->peer_addr, 128, 0,
+ ifp->idev->dev, 0, 0,
+ GFP_ATOMIC);
+ break;
+ case RTM_DELADDR:
+ if (ifp->idev->cnf.forwarding)
+ addrconf_leave_anycast(ifp);
+ addrconf_leave_solict(ifp->idev, &ifp->addr);
+ if (!ipv6_addr_any(&ifp->peer_addr)) {
+ struct fib6_info *rt;
+
+ rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
+ ifp->idev->dev, 0, 0);
+ if (rt)
+ ip6_del_rt(net, rt);
+ }
+ if (ifp->rt) {
+ ip6_del_rt(net, ifp->rt);
+ ifp->rt = NULL;
+ }
+ rt_genid_bump_ipv6(net);
+ break;
+ }
+ atomic_inc(&net->ipv6.dev_addr_genid);
+}
+
+static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
+{
+ rcu_read_lock_bh();
+ if (likely(ifp->idev->dead == 0))
+ __ipv6_ifa_notify(event, ifp);
+ rcu_read_unlock_bh();
+}
+
+#ifdef CONFIG_SYSCTL
+
+static
+int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int val = *valp;
+ loff_t pos = *ppos;
+ struct ctl_table lctl;
+ int ret;
+
+ /*
+ * ctl->data points to idev->cnf.forwarding, we should
+ * not modify it until we get the rtnl lock.
+ */
+ lctl = *ctl;
+ lctl.data = &val;
+
+ ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+
+ if (write)
+ ret = addrconf_fixup_forwarding(ctl, valp, val);
+ if (ret)
+ *ppos = pos;
+ return ret;
+}
+
+static
+int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct inet6_dev *idev = ctl->extra1;
+ int min_mtu = IPV6_MIN_MTU;
+ struct ctl_table lctl;
+
+ lctl = *ctl;
+ lctl.extra1 = &min_mtu;
+ lctl.extra2 = idev ? &idev->dev->mtu : NULL;
+
+ return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
+}
+
+static void dev_disable_change(struct inet6_dev *idev)
+{
+ struct netdev_notifier_info info;
+
+ if (!idev || !idev->dev)
+ return;
+
+ netdev_notifier_info_init(&info, idev->dev);
+ if (idev->cnf.disable_ipv6)
+ addrconf_notify(NULL, NETDEV_DOWN, &info);
+ else
+ addrconf_notify(NULL, NETDEV_UP, &info);
+}
+
+static void addrconf_disable_change(struct net *net, __s32 newf)
+{
+ struct net_device *dev;
+ struct inet6_dev *idev;
+
+ for_each_netdev(net, dev) {
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
+ idev->cnf.disable_ipv6 = newf;
+ if (changed)
+ dev_disable_change(idev);
+ }
+ }
+}
+
+static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
+{
+ struct net *net;
+ int old;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ net = (struct net *)table->extra2;
+ old = *p;
+ *p = newf;
+
+ if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
+ rtnl_unlock();
+ return 0;
+ }
+
+ if (p == &net->ipv6.devconf_all->disable_ipv6) {
+ net->ipv6.devconf_dflt->disable_ipv6 = newf;
+ addrconf_disable_change(net, newf);
+ } else if ((!newf) ^ (!old))
+ dev_disable_change((struct inet6_dev *)table->extra1);
+
+ rtnl_unlock();
+ return 0;
+}
+
+static
+int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int val = *valp;
+ loff_t pos = *ppos;
+ struct ctl_table lctl;
+ int ret;
+
+ /*
+ * ctl->data points to idev->cnf.disable_ipv6, we should
+ * not modify it until we get the rtnl lock.
+ */
+ lctl = *ctl;
+ lctl.data = &val;
+
+ ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+
+ if (write)
+ ret = addrconf_disable_ipv6(ctl, valp, val);
+ if (ret)
+ *ppos = pos;
+ return ret;
+}
+
+static
+int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int ret;
+ int old, new;
+
+ old = *valp;
+ ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
+ new = *valp;
+
+ if (write && old != new) {
+ struct net *net = ctl->extra2;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_PROXY_NEIGH,
+ NETCONFA_IFINDEX_DEFAULT,
+ net->ipv6.devconf_dflt);
+ else if (valp == &net->ipv6.devconf_all->proxy_ndp)
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_PROXY_NEIGH,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
+ else {
+ struct inet6_dev *idev = ctl->extra1;
+
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_PROXY_NEIGH,
+ idev->dev->ifindex,
+ &idev->cnf);
+ }
+ rtnl_unlock();
+ }
+
+ return ret;
+}
+
+static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ int ret = 0;
+ u32 new_val;
+ struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
+ struct net *net = (struct net *)ctl->extra2;
+ struct ctl_table tmp = {
+ .data = &new_val,
+ .maxlen = sizeof(new_val),
+ .mode = ctl->mode,
+ };
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ new_val = *((u32 *)ctl->data);
+
+ ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
+ if (ret != 0)
+ goto out;
+
+ if (write) {
+ if (check_addr_gen_mode(new_val) < 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (idev) {
+ if (check_stable_privacy(idev, net, new_val) < 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (idev->cnf.addr_gen_mode != new_val) {
+ idev->cnf.addr_gen_mode = new_val;
+ addrconf_dev_config(idev->dev);
+ }
+ } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
+ struct net_device *dev;
+
+ net->ipv6.devconf_dflt->addr_gen_mode = new_val;
+ for_each_netdev(net, dev) {
+ idev = __in6_dev_get(dev);
+ if (idev &&
+ idev->cnf.addr_gen_mode != new_val) {
+ idev->cnf.addr_gen_mode = new_val;
+ addrconf_dev_config(idev->dev);
+ }
+ }
+ }
+
+ *((u32 *)ctl->data) = new_val;
+ }
+
+out:
+ rtnl_unlock();
+
+ return ret;
+}
+
+static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ int err;
+ struct in6_addr addr;
+ char str[IPV6_MAX_STRLEN];
+ struct ctl_table lctl = *ctl;
+ struct net *net = ctl->extra2;
+ struct ipv6_stable_secret *secret = ctl->data;
+
+ if (&net->ipv6.devconf_all->stable_secret == ctl->data)
+ return -EIO;
+
+ lctl.maxlen = IPV6_MAX_STRLEN;
+ lctl.data = str;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ if (!write && !secret->initialized) {
+ err = -EIO;
+ goto out;
+ }
+
+ err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
+ if (err >= sizeof(str)) {
+ err = -EIO;
+ goto out;
+ }
+
+ err = proc_dostring(&lctl, write, buffer, lenp, ppos);
+ if (err || !write)
+ goto out;
+
+ if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
+ err = -EIO;
+ goto out;
+ }
+
+ secret->initialized = true;
+ secret->secret = addr;
+
+ if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
+ struct net_device *dev;
+
+ for_each_netdev(net, dev) {
+ struct inet6_dev *idev = __in6_dev_get(dev);
+
+ if (idev) {
+ idev->cnf.addr_gen_mode =
+ IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
+ }
+ }
+ } else {
+ struct inet6_dev *idev = ctl->extra1;
+
+ idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
+ }
+
+out:
+ rtnl_unlock();
+
+ return err;
+}
+
+static
+int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
+ int write,
+ void __user *buffer,
+ size_t *lenp,
+ loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int val = *valp;
+ loff_t pos = *ppos;
+ struct ctl_table lctl;
+ int ret;
+
+ /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
+ * we should not modify it until we get the rtnl lock.
+ */
+ lctl = *ctl;
+ lctl.data = &val;
+
+ ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+
+ if (write)
+ ret = addrconf_fixup_linkdown(ctl, valp, val);
+ if (ret)
+ *ppos = pos;
+ return ret;
+}
+
+static
+void addrconf_set_nopolicy(struct rt6_info *rt, int action)
+{
+ if (rt) {
+ if (action)
+ rt->dst.flags |= DST_NOPOLICY;
+ else
+ rt->dst.flags &= ~DST_NOPOLICY;
+ }
+}
+
+static
+void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
+{
+ struct inet6_ifaddr *ifa;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ spin_lock(&ifa->lock);
+ if (ifa->rt) {
+ struct fib6_info *rt = ifa->rt;
+ int cpu;
+
+ rcu_read_lock();
+ ifa->rt->dst_nopolicy = val ? true : false;
+ if (rt->rt6i_pcpu) {
+ for_each_possible_cpu(cpu) {
+ struct rt6_info **rtp;
+
+ rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
+ addrconf_set_nopolicy(*rtp, val);
+ }
+ }
+ rcu_read_unlock();
+ }
+ spin_unlock(&ifa->lock);
+ }
+ read_unlock_bh(&idev->lock);
+}
+
+static
+int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
+{
+ struct inet6_dev *idev;
+ struct net *net;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ *valp = val;
+
+ net = (struct net *)ctl->extra2;
+ if (valp == &net->ipv6.devconf_dflt->disable_policy) {
+ rtnl_unlock();
+ return 0;
+ }
+
+ if (valp == &net->ipv6.devconf_all->disable_policy) {
+ struct net_device *dev;
+
+ for_each_netdev(net, dev) {
+ idev = __in6_dev_get(dev);
+ if (idev)
+ addrconf_disable_policy_idev(idev, val);
+ }
+ } else {
+ idev = (struct inet6_dev *)ctl->extra1;
+ addrconf_disable_policy_idev(idev, val);
+ }
+
+ rtnl_unlock();
+ return 0;
+}
+
+static
+int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int val = *valp;
+ loff_t pos = *ppos;
+ struct ctl_table lctl;
+ int ret;
+
+ lctl = *ctl;
+ lctl.data = &val;
+ ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+
+ if (write && (*valp != val))
+ ret = addrconf_disable_policy(ctl, valp, val);
+
+ if (ret)
+ *ppos = pos;
+
+ return ret;
+}
+
+static int minus_one = -1;
+static const int zero = 0;
+static const int one = 1;
+static const int two_five_five = 255;
+
+static const struct ctl_table addrconf_sysctl[] = {
+ {
+ .procname = "forwarding",
+ .data = &ipv6_devconf.forwarding,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_forward,
+ },
+ {
+ .procname = "hop_limit",
+ .data = &ipv6_devconf.hop_limit,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (void *)&one,
+ .extra2 = (void *)&two_five_five,
+ },
+ {
+ .procname = "mtu",
+ .data = &ipv6_devconf.mtu6,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_mtu,
+ },
+ {
+ .procname = "accept_ra",
+ .data = &ipv6_devconf.accept_ra,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "accept_redirects",
+ .data = &ipv6_devconf.accept_redirects,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "autoconf",
+ .data = &ipv6_devconf.autoconf,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "dad_transmits",
+ .data = &ipv6_devconf.dad_transmits,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "router_solicitations",
+ .data = &ipv6_devconf.rtr_solicits,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &minus_one,
+ },
+ {
+ .procname = "router_solicitation_interval",
+ .data = &ipv6_devconf.rtr_solicit_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "router_solicitation_max_interval",
+ .data = &ipv6_devconf.rtr_solicit_max_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "router_solicitation_delay",
+ .data = &ipv6_devconf.rtr_solicit_delay,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "force_mld_version",
+ .data = &ipv6_devconf.force_mld_version,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "mldv1_unsolicited_report_interval",
+ .data =
+ &ipv6_devconf.mldv1_unsolicited_report_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ },
+ {
+ .procname = "mldv2_unsolicited_report_interval",
+ .data =
+ &ipv6_devconf.mldv2_unsolicited_report_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ },
+ {
+ .procname = "use_tempaddr",
+ .data = &ipv6_devconf.use_tempaddr,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "temp_valid_lft",
+ .data = &ipv6_devconf.temp_valid_lft,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "temp_prefered_lft",
+ .data = &ipv6_devconf.temp_prefered_lft,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "regen_max_retry",
+ .data = &ipv6_devconf.regen_max_retry,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "max_desync_factor",
+ .data = &ipv6_devconf.max_desync_factor,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "max_addresses",
+ .data = &ipv6_devconf.max_addresses,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "accept_ra_defrtr",
+ .data = &ipv6_devconf.accept_ra_defrtr,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "accept_ra_min_hop_limit",
+ .data = &ipv6_devconf.accept_ra_min_hop_limit,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "accept_ra_pinfo",
+ .data = &ipv6_devconf.accept_ra_pinfo,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ {
+ .procname = "accept_ra_rtr_pref",
+ .data = &ipv6_devconf.accept_ra_rtr_pref,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "router_probe_interval",
+ .data = &ipv6_devconf.rtr_probe_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ {
+ .procname = "accept_ra_rt_info_min_plen",
+ .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "accept_ra_rt_info_max_plen",
+ .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#endif
+ {
+ .procname = "proxy_ndp",
+ .data = &ipv6_devconf.proxy_ndp,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_proxy_ndp,
+ },
+ {
+ .procname = "accept_source_route",
+ .data = &ipv6_devconf.accept_source_route,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ {
+ .procname = "optimistic_dad",
+ .data = &ipv6_devconf.optimistic_dad,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "use_optimistic",
+ .data = &ipv6_devconf.use_optimistic,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#ifdef CONFIG_IPV6_MROUTE
+ {
+ .procname = "mc_forwarding",
+ .data = &ipv6_devconf.mc_forwarding,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+ {
+ .procname = "disable_ipv6",
+ .data = &ipv6_devconf.disable_ipv6,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_disable,
+ },
+ {
+ .procname = "accept_dad",
+ .data = &ipv6_devconf.accept_dad,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "force_tllao",
+ .data = &ipv6_devconf.force_tllao,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "ndisc_notify",
+ .data = &ipv6_devconf.ndisc_notify,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "suppress_frag_ndisc",
+ .data = &ipv6_devconf.suppress_frag_ndisc,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "accept_ra_from_local",
+ .data = &ipv6_devconf.accept_ra_from_local,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "accept_ra_mtu",
+ .data = &ipv6_devconf.accept_ra_mtu,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "stable_secret",
+ .data = &ipv6_devconf.stable_secret,
+ .maxlen = IPV6_MAX_STRLEN,
+ .mode = 0600,
+ .proc_handler = addrconf_sysctl_stable_secret,
+ },
+ {
+ .procname = "use_oif_addrs_only",
+ .data = &ipv6_devconf.use_oif_addrs_only,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "ignore_routes_with_linkdown",
+ .data = &ipv6_devconf.ignore_routes_with_linkdown,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
+ },
+ {
+ .procname = "drop_unicast_in_l2_multicast",
+ .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "drop_unsolicited_na",
+ .data = &ipv6_devconf.drop_unsolicited_na,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "keep_addr_on_down",
+ .data = &ipv6_devconf.keep_addr_on_down,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+
+ },
+ {
+ .procname = "seg6_enabled",
+ .data = &ipv6_devconf.seg6_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ {
+ .procname = "seg6_require_hmac",
+ .data = &ipv6_devconf.seg6_require_hmac,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+ {
+ .procname = "enhanced_dad",
+ .data = &ipv6_devconf.enhanced_dad,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "addr_gen_mode",
+ .data = &ipv6_devconf.addr_gen_mode,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_addr_gen_mode,
+ },
+ {
+ .procname = "disable_policy",
+ .data = &ipv6_devconf.disable_policy,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_disable_policy,
+ },
+ {
+ .procname = "ndisc_tclass",
+ .data = &ipv6_devconf.ndisc_tclass,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (void *)&zero,
+ .extra2 = (void *)&two_five_five,
+ },
+ {
+ /* sentinel */
+ }
+};
+
+static int __addrconf_sysctl_register(struct net *net, char *dev_name,
+ struct inet6_dev *idev, struct ipv6_devconf *p)
+{
+ int i, ifindex;
+ struct ctl_table *table;
+ char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
+
+ table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
+ if (!table)
+ goto out;
+
+ for (i = 0; table[i].data; i++) {
+ table[i].data += (char *)p - (char *)&ipv6_devconf;
+ /* If one of these is already set, then it is not safe to
+ * overwrite either of them: this makes proc_dointvec_minmax
+ * usable.
+ */
+ if (!table[i].extra1 && !table[i].extra2) {
+ table[i].extra1 = idev; /* embedded; no ref */
+ table[i].extra2 = net;
+ }
+ }
+
+ snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
+
+ p->sysctl_header = register_net_sysctl(net, path, table);
+ if (!p->sysctl_header)
+ goto free;
+
+ if (!strcmp(dev_name, "all"))
+ ifindex = NETCONFA_IFINDEX_ALL;
+ else if (!strcmp(dev_name, "default"))
+ ifindex = NETCONFA_IFINDEX_DEFAULT;
+ else
+ ifindex = idev->dev->ifindex;
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
+ ifindex, p);
+ return 0;
+
+free:
+ kfree(table);
+out:
+ return -ENOBUFS;
+}
+
+static void __addrconf_sysctl_unregister(struct net *net,
+ struct ipv6_devconf *p, int ifindex)
+{
+ struct ctl_table *table;
+
+ if (!p->sysctl_header)
+ return;
+
+ table = p->sysctl_header->ctl_table_arg;
+ unregister_net_sysctl_table(p->sysctl_header);
+ p->sysctl_header = NULL;
+ kfree(table);
+
+ inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
+}
+
+static int addrconf_sysctl_register(struct inet6_dev *idev)
+{
+ int err;
+
+ if (!sysctl_dev_name_is_allowed(idev->dev->name))
+ return -EINVAL;
+
+ err = neigh_sysctl_register(idev->dev, idev->nd_parms,
+ &ndisc_ifinfo_sysctl_change);
+ if (err)
+ return err;
+ err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
+ idev, &idev->cnf);
+ if (err)
+ neigh_sysctl_unregister(idev->nd_parms);
+
+ return err;
+}
+
+static void addrconf_sysctl_unregister(struct inet6_dev *idev)
+{
+ __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
+ idev->dev->ifindex);
+ neigh_sysctl_unregister(idev->nd_parms);
+}
+
+
+#endif
+
+static int __net_init addrconf_init_net(struct net *net)
+{
+ int err = -ENOMEM;
+ struct ipv6_devconf *all, *dflt;
+
+ all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
+ if (!all)
+ goto err_alloc_all;
+
+ dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
+ if (!dflt)
+ goto err_alloc_dflt;
+
+ /* these will be inherited by all namespaces */
+ dflt->autoconf = ipv6_defaults.autoconf;
+ dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
+
+ dflt->stable_secret.initialized = false;
+ all->stable_secret.initialized = false;
+
+ net->ipv6.devconf_all = all;
+ net->ipv6.devconf_dflt = dflt;
+
+#ifdef CONFIG_SYSCTL
+ err = __addrconf_sysctl_register(net, "all", NULL, all);
+ if (err < 0)
+ goto err_reg_all;
+
+ err = __addrconf_sysctl_register(net, "default", NULL, dflt);
+ if (err < 0)
+ goto err_reg_dflt;
+#endif
+ return 0;
+
+#ifdef CONFIG_SYSCTL
+err_reg_dflt:
+ __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
+err_reg_all:
+ kfree(dflt);
+#endif
+err_alloc_dflt:
+ kfree(all);
+err_alloc_all:
+ return err;
+}
+
+static void __net_exit addrconf_exit_net(struct net *net)
+{
+#ifdef CONFIG_SYSCTL
+ __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
+ NETCONFA_IFINDEX_DEFAULT);
+ __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
+ NETCONFA_IFINDEX_ALL);
+#endif
+ kfree(net->ipv6.devconf_dflt);
+ kfree(net->ipv6.devconf_all);
+}
+
+static struct pernet_operations addrconf_ops = {
+ .init = addrconf_init_net,
+ .exit = addrconf_exit_net,
+};
+
+static struct rtnl_af_ops inet6_ops __read_mostly = {
+ .family = AF_INET6,
+ .fill_link_af = inet6_fill_link_af,
+ .get_link_af_size = inet6_get_link_af_size,
+ .validate_link_af = inet6_validate_link_af,
+ .set_link_af = inet6_set_link_af,
+};
+
+/*
+ * Init / cleanup code
+ */
+
+int __init addrconf_init(void)
+{
+ struct inet6_dev *idev;
+ int i, err;
+
+ err = ipv6_addr_label_init();
+ if (err < 0) {
+ pr_crit("%s: cannot initialize default policy table: %d\n",
+ __func__, err);
+ goto out;
+ }
+
+ err = register_pernet_subsys(&addrconf_ops);
+ if (err < 0)
+ goto out_addrlabel;
+
+ addrconf_wq = create_workqueue("ipv6_addrconf");
+ if (!addrconf_wq) {
+ err = -ENOMEM;
+ goto out_nowq;
+ }
+
+ /* The addrconf netdev notifier requires that loopback_dev
+ * has it's ipv6 private information allocated and setup
+ * before it can bring up and give link-local addresses
+ * to other devices which are up.
+ *
+ * Unfortunately, loopback_dev is not necessarily the first
+ * entry in the global dev_base list of net devices. In fact,
+ * it is likely to be the very last entry on that list.
+ * So this causes the notifier registry below to try and
+ * give link-local addresses to all devices besides loopback_dev
+ * first, then loopback_dev, which cases all the non-loopback_dev
+ * devices to fail to get a link-local address.
+ *
+ * So, as a temporary fix, allocate the ipv6 structure for
+ * loopback_dev first by hand.
+ * Longer term, all of the dependencies ipv6 has upon the loopback
+ * device and it being up should be removed.
+ */
+ rtnl_lock();
+ idev = ipv6_add_dev(init_net.loopback_dev);
+ rtnl_unlock();
+ if (IS_ERR(idev)) {
+ err = PTR_ERR(idev);
+ goto errlo;
+ }
+
+ ip6_route_init_special_entries();
+
+ for (i = 0; i < IN6_ADDR_HSIZE; i++)
+ INIT_HLIST_HEAD(&inet6_addr_lst[i]);
+
+ register_netdevice_notifier(&ipv6_dev_notf);
+
+ addrconf_verify();
+
+ rtnl_af_register(&inet6_ops);
+
+ err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
+ NULL, inet6_dump_ifinfo, 0);
+ if (err < 0)
+ goto errout;
+
+ err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
+ inet6_rtm_newaddr, NULL, 0);
+ if (err < 0)
+ goto errout;
+ err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
+ inet6_rtm_deladdr, NULL, 0);
+ if (err < 0)
+ goto errout;
+ err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
+ inet6_rtm_getaddr, inet6_dump_ifaddr,
+ RTNL_FLAG_DOIT_UNLOCKED);
+ if (err < 0)
+ goto errout;
+ err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
+ NULL, inet6_dump_ifmcaddr, 0);
+ if (err < 0)
+ goto errout;
+ err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
+ NULL, inet6_dump_ifacaddr, 0);
+ if (err < 0)
+ goto errout;
+ err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
+ inet6_netconf_get_devconf,
+ inet6_netconf_dump_devconf,
+ RTNL_FLAG_DOIT_UNLOCKED);
+ if (err < 0)
+ goto errout;
+ err = ipv6_addr_label_rtnl_register();
+ if (err < 0)
+ goto errout;
+
+ return 0;
+errout:
+ rtnl_unregister_all(PF_INET6);
+ rtnl_af_unregister(&inet6_ops);
+ unregister_netdevice_notifier(&ipv6_dev_notf);
+errlo:
+ destroy_workqueue(addrconf_wq);
+out_nowq:
+ unregister_pernet_subsys(&addrconf_ops);
+out_addrlabel:
+ ipv6_addr_label_cleanup();
+out:
+ return err;
+}
+
+void addrconf_cleanup(void)
+{
+ struct net_device *dev;
+ int i;
+
+ unregister_netdevice_notifier(&ipv6_dev_notf);
+ unregister_pernet_subsys(&addrconf_ops);
+ ipv6_addr_label_cleanup();
+
+ rtnl_af_unregister(&inet6_ops);
+
+ rtnl_lock();
+
+ /* clean dev list */
+ for_each_netdev(&init_net, dev) {
+ if (__in6_dev_get(dev) == NULL)
+ continue;
+ addrconf_ifdown(dev, 1);
+ }
+ addrconf_ifdown(init_net.loopback_dev, 2);
+
+ /*
+ * Check hash table.
+ */
+ spin_lock_bh(&addrconf_hash_lock);
+ for (i = 0; i < IN6_ADDR_HSIZE; i++)
+ WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
+ spin_unlock_bh(&addrconf_hash_lock);
+ cancel_delayed_work(&addr_chk_work);
+ rtnl_unlock();
+
+ destroy_workqueue(addrconf_wq);
+}
diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
new file mode 100644
index 0000000..5cd0029
--- /dev/null
+++ b/net/ipv6/addrconf_core.c
@@ -0,0 +1,232 @@
+/*
+ * IPv6 library code, needed by static components when full IPv6 support is
+ * not configured or static.
+ */
+
+#include <linux/export.h>
+#include <net/ipv6.h>
+#include <net/addrconf.h>
+#include <net/ip.h>
+
+/* if ipv6 module registers this function is used by xfrm to force all
+ * sockets to relookup their nodes - this is fairly expensive, be
+ * careful
+ */
+void (*__fib6_flush_trees)(struct net *);
+EXPORT_SYMBOL(__fib6_flush_trees);
+
+#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
+
+static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
+{
+ switch (scope) {
+ case IPV6_ADDR_SCOPE_NODELOCAL:
+ return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
+ IPV6_ADDR_LOOPBACK);
+ case IPV6_ADDR_SCOPE_LINKLOCAL:
+ return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
+ IPV6_ADDR_LINKLOCAL);
+ case IPV6_ADDR_SCOPE_SITELOCAL:
+ return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
+ IPV6_ADDR_SITELOCAL);
+ }
+ return IPV6_ADDR_SCOPE_TYPE(scope);
+}
+
+int __ipv6_addr_type(const struct in6_addr *addr)
+{
+ __be32 st;
+
+ st = addr->s6_addr32[0];
+
+ /* Consider all addresses with the first three bits different of
+ 000 and 111 as unicasts.
+ */
+ if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
+ (st & htonl(0xE0000000)) != htonl(0xE0000000))
+ return (IPV6_ADDR_UNICAST |
+ IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
+
+ if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
+ /* multicast */
+ /* addr-select 3.1 */
+ return (IPV6_ADDR_MULTICAST |
+ ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
+ }
+
+ if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
+ return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
+ IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
+ if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
+ return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
+ IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
+ if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
+ return (IPV6_ADDR_UNICAST |
+ IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
+
+ if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
+ if (addr->s6_addr32[2] == 0) {
+ if (addr->s6_addr32[3] == 0)
+ return IPV6_ADDR_ANY;
+
+ if (addr->s6_addr32[3] == htonl(0x00000001))
+ return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
+ IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
+
+ return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
+ IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
+ }
+
+ if (addr->s6_addr32[2] == htonl(0x0000ffff))
+ return (IPV6_ADDR_MAPPED |
+ IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
+ }
+
+ return (IPV6_ADDR_UNICAST |
+ IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
+}
+EXPORT_SYMBOL(__ipv6_addr_type);
+
+static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
+static BLOCKING_NOTIFIER_HEAD(inet6addr_validator_chain);
+
+int register_inet6addr_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&inet6addr_chain, nb);
+}
+EXPORT_SYMBOL(register_inet6addr_notifier);
+
+int unregister_inet6addr_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
+}
+EXPORT_SYMBOL(unregister_inet6addr_notifier);
+
+int inet6addr_notifier_call_chain(unsigned long val, void *v)
+{
+ return atomic_notifier_call_chain(&inet6addr_chain, val, v);
+}
+EXPORT_SYMBOL(inet6addr_notifier_call_chain);
+
+int register_inet6addr_validator_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&inet6addr_validator_chain, nb);
+}
+EXPORT_SYMBOL(register_inet6addr_validator_notifier);
+
+int unregister_inet6addr_validator_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&inet6addr_validator_chain,
+ nb);
+}
+EXPORT_SYMBOL(unregister_inet6addr_validator_notifier);
+
+int inet6addr_validator_notifier_call_chain(unsigned long val, void *v)
+{
+ return blocking_notifier_call_chain(&inet6addr_validator_chain, val, v);
+}
+EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain);
+
+static int eafnosupport_ipv6_dst_lookup(struct net *net, struct sock *u1,
+ struct dst_entry **u2,
+ struct flowi6 *u3)
+{
+ return -EAFNOSUPPORT;
+}
+
+static struct fib6_table *eafnosupport_fib6_get_table(struct net *net, u32 id)
+{
+ return NULL;
+}
+
+static struct fib6_info *
+eafnosupport_fib6_table_lookup(struct net *net, struct fib6_table *table,
+ int oif, struct flowi6 *fl6, int flags)
+{
+ return NULL;
+}
+
+static struct fib6_info *
+eafnosupport_fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
+ int flags)
+{
+ return NULL;
+}
+
+static struct fib6_info *
+eafnosupport_fib6_multipath_select(const struct net *net, struct fib6_info *f6i,
+ struct flowi6 *fl6, int oif,
+ const struct sk_buff *skb, int strict)
+{
+ return f6i;
+}
+
+static u32
+eafnosupport_ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
+ struct in6_addr *saddr)
+{
+ return 0;
+}
+
+const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
+ .ipv6_dst_lookup = eafnosupport_ipv6_dst_lookup,
+ .fib6_get_table = eafnosupport_fib6_get_table,
+ .fib6_table_lookup = eafnosupport_fib6_table_lookup,
+ .fib6_lookup = eafnosupport_fib6_lookup,
+ .fib6_multipath_select = eafnosupport_fib6_multipath_select,
+ .ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6,
+};
+EXPORT_SYMBOL_GPL(ipv6_stub);
+
+/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
+const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
+EXPORT_SYMBOL(in6addr_loopback);
+const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
+EXPORT_SYMBOL(in6addr_any);
+const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
+EXPORT_SYMBOL(in6addr_linklocal_allnodes);
+const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
+EXPORT_SYMBOL(in6addr_linklocal_allrouters);
+const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
+EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
+const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
+EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
+const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
+EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
+
+static void snmp6_free_dev(struct inet6_dev *idev)
+{
+ kfree(idev->stats.icmpv6msgdev);
+ kfree(idev->stats.icmpv6dev);
+ free_percpu(idev->stats.ipv6);
+}
+
+static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
+{
+ struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
+
+ snmp6_free_dev(idev);
+ kfree(idev);
+}
+
+/* Nobody refers to this device, we may destroy it. */
+
+void in6_dev_finish_destroy(struct inet6_dev *idev)
+{
+ struct net_device *dev = idev->dev;
+
+ WARN_ON(!list_empty(&idev->addr_list));
+ WARN_ON(idev->mc_list);
+ WARN_ON(timer_pending(&idev->rs_timer));
+
+#ifdef NET_REFCNT_DEBUG
+ pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
+#endif
+ dev_put(dev);
+ if (!idev->dead) {
+ pr_warn("Freeing alive inet6 device %p\n", idev);
+ return;
+ }
+ call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
+}
+EXPORT_SYMBOL(in6_dev_finish_destroy);
diff --git a/net/ipv6/addrlabel.c b/net/ipv6/addrlabel.c
new file mode 100644
index 0000000..1d6ced3
--- /dev/null
+++ b/net/ipv6/addrlabel.c
@@ -0,0 +1,568 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * IPv6 Address Label subsystem
+ * for the IPv6 "Default" Source Address Selection
+ *
+ * Copyright (C)2007 USAGI/WIDE Project
+ */
+/*
+ * Author:
+ * YOSHIFUJI Hideaki @ USAGI/WIDE Project <yoshfuji@linux-ipv6.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/rcupdate.h>
+#include <linux/in6.h>
+#include <linux/slab.h>
+#include <net/addrconf.h>
+#include <linux/if_addrlabel.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#if 0
+#define ADDRLABEL(x...) printk(x)
+#else
+#define ADDRLABEL(x...) do { ; } while (0)
+#endif
+
+/*
+ * Policy Table
+ */
+struct ip6addrlbl_entry {
+ struct in6_addr prefix;
+ int prefixlen;
+ int ifindex;
+ int addrtype;
+ u32 label;
+ struct hlist_node list;
+ struct rcu_head rcu;
+};
+
+/*
+ * Default policy table (RFC6724 + extensions)
+ *
+ * prefix addr_type label
+ * -------------------------------------------------------------------------
+ * ::1/128 LOOPBACK 0
+ * ::/0 N/A 1
+ * 2002::/16 N/A 2
+ * ::/96 COMPATv4 3
+ * ::ffff:0:0/96 V4MAPPED 4
+ * fc00::/7 N/A 5 ULA (RFC 4193)
+ * 2001::/32 N/A 6 Teredo (RFC 4380)
+ * 2001:10::/28 N/A 7 ORCHID (RFC 4843)
+ * fec0::/10 N/A 11 Site-local
+ * (deprecated by RFC3879)
+ * 3ffe::/16 N/A 12 6bone
+ *
+ * Note: 0xffffffff is used if we do not have any policies.
+ * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724.
+ */
+
+#define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL
+
+static const __net_initconst struct ip6addrlbl_init_table
+{
+ const struct in6_addr *prefix;
+ int prefixlen;
+ u32 label;
+} ip6addrlbl_init_table[] = {
+ { /* ::/0 */
+ .prefix = &in6addr_any,
+ .label = 1,
+ }, { /* fc00::/7 */
+ .prefix = &(struct in6_addr){ { { 0xfc } } } ,
+ .prefixlen = 7,
+ .label = 5,
+ }, { /* fec0::/10 */
+ .prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } },
+ .prefixlen = 10,
+ .label = 11,
+ }, { /* 2002::/16 */
+ .prefix = &(struct in6_addr){ { { 0x20, 0x02 } } },
+ .prefixlen = 16,
+ .label = 2,
+ }, { /* 3ffe::/16 */
+ .prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } },
+ .prefixlen = 16,
+ .label = 12,
+ }, { /* 2001::/32 */
+ .prefix = &(struct in6_addr){ { { 0x20, 0x01 } } },
+ .prefixlen = 32,
+ .label = 6,
+ }, { /* 2001:10::/28 */
+ .prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } },
+ .prefixlen = 28,
+ .label = 7,
+ }, { /* ::ffff:0:0 */
+ .prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } },
+ .prefixlen = 96,
+ .label = 4,
+ }, { /* ::/96 */
+ .prefix = &in6addr_any,
+ .prefixlen = 96,
+ .label = 3,
+ }, { /* ::1/128 */
+ .prefix = &in6addr_loopback,
+ .prefixlen = 128,
+ .label = 0,
+ }
+};
+
+/* Find label */
+static bool __ip6addrlbl_match(const struct ip6addrlbl_entry *p,
+ const struct in6_addr *addr,
+ int addrtype, int ifindex)
+{
+ if (p->ifindex && p->ifindex != ifindex)
+ return false;
+ if (p->addrtype && p->addrtype != addrtype)
+ return false;
+ if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen))
+ return false;
+ return true;
+}
+
+static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net,
+ const struct in6_addr *addr,
+ int type, int ifindex)
+{
+ struct ip6addrlbl_entry *p;
+
+ hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) {
+ if (__ip6addrlbl_match(p, addr, type, ifindex))
+ return p;
+ }
+ return NULL;
+}
+
+u32 ipv6_addr_label(struct net *net,
+ const struct in6_addr *addr, int type, int ifindex)
+{
+ u32 label;
+ struct ip6addrlbl_entry *p;
+
+ type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK;
+
+ rcu_read_lock();
+ p = __ipv6_addr_label(net, addr, type, ifindex);
+ label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT;
+ rcu_read_unlock();
+
+ ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n",
+ __func__, addr, type, ifindex, label);
+
+ return label;
+}
+
+/* allocate one entry */
+static struct ip6addrlbl_entry *ip6addrlbl_alloc(const struct in6_addr *prefix,
+ int prefixlen, int ifindex,
+ u32 label)
+{
+ struct ip6addrlbl_entry *newp;
+ int addrtype;
+
+ ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n",
+ __func__, prefix, prefixlen, ifindex, (unsigned int)label);
+
+ addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK);
+
+ switch (addrtype) {
+ case IPV6_ADDR_MAPPED:
+ if (prefixlen > 96)
+ return ERR_PTR(-EINVAL);
+ if (prefixlen < 96)
+ addrtype = 0;
+ break;
+ case IPV6_ADDR_COMPATv4:
+ if (prefixlen != 96)
+ addrtype = 0;
+ break;
+ case IPV6_ADDR_LOOPBACK:
+ if (prefixlen != 128)
+ addrtype = 0;
+ break;
+ }
+
+ newp = kmalloc(sizeof(*newp), GFP_KERNEL);
+ if (!newp)
+ return ERR_PTR(-ENOMEM);
+
+ ipv6_addr_prefix(&newp->prefix, prefix, prefixlen);
+ newp->prefixlen = prefixlen;
+ newp->ifindex = ifindex;
+ newp->addrtype = addrtype;
+ newp->label = label;
+ INIT_HLIST_NODE(&newp->list);
+ return newp;
+}
+
+/* add a label */
+static int __ip6addrlbl_add(struct net *net, struct ip6addrlbl_entry *newp,
+ int replace)
+{
+ struct ip6addrlbl_entry *last = NULL, *p = NULL;
+ struct hlist_node *n;
+ int ret = 0;
+
+ ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp,
+ replace);
+
+ hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
+ if (p->prefixlen == newp->prefixlen &&
+ p->ifindex == newp->ifindex &&
+ ipv6_addr_equal(&p->prefix, &newp->prefix)) {
+ if (!replace) {
+ ret = -EEXIST;
+ goto out;
+ }
+ hlist_replace_rcu(&p->list, &newp->list);
+ kfree_rcu(p, rcu);
+ goto out;
+ } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) ||
+ (p->prefixlen < newp->prefixlen)) {
+ hlist_add_before_rcu(&newp->list, &p->list);
+ goto out;
+ }
+ last = p;
+ }
+ if (last)
+ hlist_add_behind_rcu(&newp->list, &last->list);
+ else
+ hlist_add_head_rcu(&newp->list, &net->ipv6.ip6addrlbl_table.head);
+out:
+ if (!ret)
+ net->ipv6.ip6addrlbl_table.seq++;
+ return ret;
+}
+
+/* add a label */
+static int ip6addrlbl_add(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ int ifindex, u32 label, int replace)
+{
+ struct ip6addrlbl_entry *newp;
+ int ret = 0;
+
+ ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n",
+ __func__, prefix, prefixlen, ifindex, (unsigned int)label,
+ replace);
+
+ newp = ip6addrlbl_alloc(prefix, prefixlen, ifindex, label);
+ if (IS_ERR(newp))
+ return PTR_ERR(newp);
+ spin_lock(&net->ipv6.ip6addrlbl_table.lock);
+ ret = __ip6addrlbl_add(net, newp, replace);
+ spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
+ if (ret)
+ kfree(newp);
+ return ret;
+}
+
+/* remove a label */
+static int __ip6addrlbl_del(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ int ifindex)
+{
+ struct ip6addrlbl_entry *p = NULL;
+ struct hlist_node *n;
+ int ret = -ESRCH;
+
+ ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
+ __func__, prefix, prefixlen, ifindex);
+
+ hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
+ if (p->prefixlen == prefixlen &&
+ p->ifindex == ifindex &&
+ ipv6_addr_equal(&p->prefix, prefix)) {
+ hlist_del_rcu(&p->list);
+ kfree_rcu(p, rcu);
+ ret = 0;
+ break;
+ }
+ }
+ return ret;
+}
+
+static int ip6addrlbl_del(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ int ifindex)
+{
+ struct in6_addr prefix_buf;
+ int ret;
+
+ ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
+ __func__, prefix, prefixlen, ifindex);
+
+ ipv6_addr_prefix(&prefix_buf, prefix, prefixlen);
+ spin_lock(&net->ipv6.ip6addrlbl_table.lock);
+ ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex);
+ spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
+ return ret;
+}
+
+/* add default label */
+static int __net_init ip6addrlbl_net_init(struct net *net)
+{
+ int err = 0;
+ int i;
+
+ ADDRLABEL(KERN_DEBUG "%s\n", __func__);
+
+ spin_lock_init(&net->ipv6.ip6addrlbl_table.lock);
+ INIT_HLIST_HEAD(&net->ipv6.ip6addrlbl_table.head);
+
+ for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
+ int ret = ip6addrlbl_add(net,
+ ip6addrlbl_init_table[i].prefix,
+ ip6addrlbl_init_table[i].prefixlen,
+ 0,
+ ip6addrlbl_init_table[i].label, 0);
+ /* XXX: should we free all rules when we catch an error? */
+ if (ret && (!err || err != -ENOMEM))
+ err = ret;
+ }
+ return err;
+}
+
+static void __net_exit ip6addrlbl_net_exit(struct net *net)
+{
+ struct ip6addrlbl_entry *p = NULL;
+ struct hlist_node *n;
+
+ /* Remove all labels belonging to the exiting net */
+ spin_lock(&net->ipv6.ip6addrlbl_table.lock);
+ hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
+ hlist_del_rcu(&p->list);
+ kfree_rcu(p, rcu);
+ }
+ spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
+}
+
+static struct pernet_operations ipv6_addr_label_ops = {
+ .init = ip6addrlbl_net_init,
+ .exit = ip6addrlbl_net_exit,
+};
+
+int __init ipv6_addr_label_init(void)
+{
+ return register_pernet_subsys(&ipv6_addr_label_ops);
+}
+
+void ipv6_addr_label_cleanup(void)
+{
+ unregister_pernet_subsys(&ipv6_addr_label_ops);
+}
+
+static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
+ [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), },
+ [IFAL_LABEL] = { .len = sizeof(u32), },
+};
+
+static bool addrlbl_ifindex_exists(struct net *net, int ifindex)
+{
+
+ struct net_device *dev;
+
+ rcu_read_lock();
+ dev = dev_get_by_index_rcu(net, ifindex);
+ rcu_read_unlock();
+
+ return dev != NULL;
+}
+
+static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct ifaddrlblmsg *ifal;
+ struct nlattr *tb[IFAL_MAX+1];
+ struct in6_addr *pfx;
+ u32 label;
+ int err = 0;
+
+ err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy,
+ extack);
+ if (err < 0)
+ return err;
+
+ ifal = nlmsg_data(nlh);
+
+ if (ifal->ifal_family != AF_INET6 ||
+ ifal->ifal_prefixlen > 128)
+ return -EINVAL;
+
+ if (!tb[IFAL_ADDRESS])
+ return -EINVAL;
+ pfx = nla_data(tb[IFAL_ADDRESS]);
+
+ if (!tb[IFAL_LABEL])
+ return -EINVAL;
+ label = nla_get_u32(tb[IFAL_LABEL]);
+ if (label == IPV6_ADDR_LABEL_DEFAULT)
+ return -EINVAL;
+
+ switch (nlh->nlmsg_type) {
+ case RTM_NEWADDRLABEL:
+ if (ifal->ifal_index &&
+ !addrlbl_ifindex_exists(net, ifal->ifal_index))
+ return -EINVAL;
+
+ err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
+ ifal->ifal_index, label,
+ nlh->nlmsg_flags & NLM_F_REPLACE);
+ break;
+ case RTM_DELADDRLABEL:
+ err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen,
+ ifal->ifal_index);
+ break;
+ default:
+ err = -EOPNOTSUPP;
+ }
+ return err;
+}
+
+static void ip6addrlbl_putmsg(struct nlmsghdr *nlh,
+ int prefixlen, int ifindex, u32 lseq)
+{
+ struct ifaddrlblmsg *ifal = nlmsg_data(nlh);
+ ifal->ifal_family = AF_INET6;
+ ifal->ifal_prefixlen = prefixlen;
+ ifal->ifal_flags = 0;
+ ifal->ifal_index = ifindex;
+ ifal->ifal_seq = lseq;
+};
+
+static int ip6addrlbl_fill(struct sk_buff *skb,
+ struct ip6addrlbl_entry *p,
+ u32 lseq,
+ u32 portid, u32 seq, int event,
+ unsigned int flags)
+{
+ struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event,
+ sizeof(struct ifaddrlblmsg), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq);
+
+ if (nla_put_in6_addr(skb, IFAL_ADDRESS, &p->prefix) < 0 ||
+ nla_put_u32(skb, IFAL_LABEL, p->label) < 0) {
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+ }
+
+ nlmsg_end(skb, nlh);
+ return 0;
+}
+
+static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct ip6addrlbl_entry *p;
+ int idx = 0, s_idx = cb->args[0];
+ int err;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) {
+ if (idx >= s_idx) {
+ err = ip6addrlbl_fill(skb, p,
+ net->ipv6.ip6addrlbl_table.seq,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWADDRLABEL,
+ NLM_F_MULTI);
+ if (err < 0)
+ break;
+ }
+ idx++;
+ }
+ rcu_read_unlock();
+ cb->args[0] = idx;
+ return skb->len;
+}
+
+static inline int ip6addrlbl_msgsize(void)
+{
+ return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))
+ + nla_total_size(16) /* IFAL_ADDRESS */
+ + nla_total_size(4); /* IFAL_LABEL */
+}
+
+static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct ifaddrlblmsg *ifal;
+ struct nlattr *tb[IFAL_MAX+1];
+ struct in6_addr *addr;
+ u32 lseq;
+ int err = 0;
+ struct ip6addrlbl_entry *p;
+ struct sk_buff *skb;
+
+ err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy,
+ extack);
+ if (err < 0)
+ return err;
+
+ ifal = nlmsg_data(nlh);
+
+ if (ifal->ifal_family != AF_INET6 ||
+ ifal->ifal_prefixlen != 128)
+ return -EINVAL;
+
+ if (ifal->ifal_index &&
+ !addrlbl_ifindex_exists(net, ifal->ifal_index))
+ return -EINVAL;
+
+ if (!tb[IFAL_ADDRESS])
+ return -EINVAL;
+ addr = nla_data(tb[IFAL_ADDRESS]);
+
+ skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL);
+ if (!skb)
+ return -ENOBUFS;
+
+ err = -ESRCH;
+
+ rcu_read_lock();
+ p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
+ lseq = net->ipv6.ip6addrlbl_table.seq;
+ if (p)
+ err = ip6addrlbl_fill(skb, p, lseq,
+ NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq,
+ RTM_NEWADDRLABEL, 0);
+ rcu_read_unlock();
+
+ if (err < 0) {
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ } else {
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+ }
+ return err;
+}
+
+int __init ipv6_addr_label_rtnl_register(void)
+{
+ int ret;
+
+ ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDRLABEL,
+ ip6addrlbl_newdel,
+ NULL, RTNL_FLAG_DOIT_UNLOCKED);
+ if (ret < 0)
+ return ret;
+ ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDRLABEL,
+ ip6addrlbl_newdel,
+ NULL, RTNL_FLAG_DOIT_UNLOCKED);
+ if (ret < 0)
+ return ret;
+ ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDRLABEL,
+ ip6addrlbl_get,
+ ip6addrlbl_dump, RTNL_FLAG_DOIT_UNLOCKED);
+ return ret;
+}
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
new file mode 100644
index 0000000..9a4261e
--- /dev/null
+++ b/net/ipv6/af_inet6.c
@@ -0,0 +1,1140 @@
+/*
+ * PF_INET6 socket protocol family
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Adapted from linux/net/ipv4/af_inet.c
+ *
+ * Fixes:
+ * piggy, Karl Knutson : Socket protocol table
+ * Hideaki YOSHIFUJI : sin6_scope_id support
+ * Arnaldo Melo : check proc_net_create return, cleanups
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/icmpv6.h>
+#include <linux/netfilter_ipv6.h>
+
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/udp.h>
+#include <net/udplite.h>
+#include <net/tcp.h>
+#include <net/ping.h>
+#include <net/protocol.h>
+#include <net/inet_common.h>
+#include <net/route.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/ndisc.h>
+#ifdef CONFIG_IPV6_TUNNEL
+#include <net/ip6_tunnel.h>
+#endif
+#include <net/calipso.h>
+#include <net/seg6.h>
+
+#include <linux/uaccess.h>
+#include <linux/mroute6.h>
+
+#include "ip6_offload.h"
+
+MODULE_AUTHOR("Cast of dozens");
+MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
+MODULE_LICENSE("GPL");
+
+/* The inetsw6 table contains everything that inet6_create needs to
+ * build a new socket.
+ */
+static struct list_head inetsw6[SOCK_MAX];
+static DEFINE_SPINLOCK(inetsw6_lock);
+
+struct ipv6_params ipv6_defaults = {
+ .disable_ipv6 = 0,
+ .autoconf = 1,
+};
+
+static int disable_ipv6_mod;
+
+module_param_named(disable, disable_ipv6_mod, int, 0444);
+MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
+
+module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
+MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
+
+module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
+MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
+
+bool ipv6_mod_enabled(void)
+{
+ return disable_ipv6_mod == 0;
+}
+EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
+
+static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
+{
+ const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
+
+ return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
+}
+
+static int inet6_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct inet_sock *inet;
+ struct ipv6_pinfo *np;
+ struct sock *sk;
+ struct inet_protosw *answer;
+ struct proto *answer_prot;
+ unsigned char answer_flags;
+ int try_loading_module = 0;
+ int err;
+
+ if (protocol < 0 || protocol >= IPPROTO_MAX)
+ return -EINVAL;
+
+ /* Look for the requested type/protocol pair. */
+lookup_protocol:
+ err = -ESOCKTNOSUPPORT;
+ rcu_read_lock();
+ list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
+
+ err = 0;
+ /* Check the non-wild match. */
+ if (protocol == answer->protocol) {
+ if (protocol != IPPROTO_IP)
+ break;
+ } else {
+ /* Check for the two wild cases. */
+ if (IPPROTO_IP == protocol) {
+ protocol = answer->protocol;
+ break;
+ }
+ if (IPPROTO_IP == answer->protocol)
+ break;
+ }
+ err = -EPROTONOSUPPORT;
+ }
+
+ if (err) {
+ if (try_loading_module < 2) {
+ rcu_read_unlock();
+ /*
+ * Be more specific, e.g. net-pf-10-proto-132-type-1
+ * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
+ */
+ if (++try_loading_module == 1)
+ request_module("net-pf-%d-proto-%d-type-%d",
+ PF_INET6, protocol, sock->type);
+ /*
+ * Fall back to generic, e.g. net-pf-10-proto-132
+ * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
+ */
+ else
+ request_module("net-pf-%d-proto-%d",
+ PF_INET6, protocol);
+ goto lookup_protocol;
+ } else
+ goto out_rcu_unlock;
+ }
+
+ err = -EPERM;
+ if (sock->type == SOCK_RAW && !kern &&
+ !ns_capable(net->user_ns, CAP_NET_RAW))
+ goto out_rcu_unlock;
+
+ sock->ops = answer->ops;
+ answer_prot = answer->prot;
+ answer_flags = answer->flags;
+ rcu_read_unlock();
+
+ WARN_ON(!answer_prot->slab);
+
+ err = -ENOBUFS;
+ sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
+ if (!sk)
+ goto out;
+
+ sock_init_data(sock, sk);
+
+ err = 0;
+ if (INET_PROTOSW_REUSE & answer_flags)
+ sk->sk_reuse = SK_CAN_REUSE;
+
+ inet = inet_sk(sk);
+ inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
+
+ if (SOCK_RAW == sock->type) {
+ inet->inet_num = protocol;
+ if (IPPROTO_RAW == protocol)
+ inet->hdrincl = 1;
+ }
+
+ sk->sk_destruct = inet_sock_destruct;
+ sk->sk_family = PF_INET6;
+ sk->sk_protocol = protocol;
+
+ sk->sk_backlog_rcv = answer->prot->backlog_rcv;
+
+ inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
+ np->hop_limit = -1;
+ np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
+ np->mc_loop = 1;
+ np->pmtudisc = IPV6_PMTUDISC_WANT;
+ np->repflow = net->ipv6.sysctl.flowlabel_reflect;
+ sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
+
+ /* Init the ipv4 part of the socket since we can have sockets
+ * using v6 API for ipv4.
+ */
+ inet->uc_ttl = -1;
+
+ inet->mc_loop = 1;
+ inet->mc_ttl = 1;
+ inet->mc_index = 0;
+ inet->mc_list = NULL;
+ inet->rcv_tos = 0;
+
+ if (net->ipv4.sysctl_ip_no_pmtu_disc)
+ inet->pmtudisc = IP_PMTUDISC_DONT;
+ else
+ inet->pmtudisc = IP_PMTUDISC_WANT;
+ /*
+ * Increment only the relevant sk_prot->socks debug field, this changes
+ * the previous behaviour of incrementing both the equivalent to
+ * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
+ *
+ * This allows better debug granularity as we'll know exactly how many
+ * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
+ * transport protocol socks. -acme
+ */
+ sk_refcnt_debug_inc(sk);
+
+ if (inet->inet_num) {
+ /* It assumes that any protocol which allows
+ * the user to assign a number at socket
+ * creation time automatically shares.
+ */
+ inet->inet_sport = htons(inet->inet_num);
+ err = sk->sk_prot->hash(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
+ }
+ if (sk->sk_prot->init) {
+ err = sk->sk_prot->init(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
+ }
+
+ if (!kern) {
+ err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
+ }
+out:
+ return err;
+out_rcu_unlock:
+ rcu_read_unlock();
+ goto out;
+}
+
+static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
+ bool force_bind_address_no_port, bool with_lock)
+{
+ struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct net *net = sock_net(sk);
+ __be32 v4addr = 0;
+ unsigned short snum;
+ bool saved_ipv6only;
+ int addr_type = 0;
+ int err = 0;
+
+ if (addr->sin6_family != AF_INET6)
+ return -EAFNOSUPPORT;
+
+ addr_type = ipv6_addr_type(&addr->sin6_addr);
+ if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
+ return -EINVAL;
+
+ snum = ntohs(addr->sin6_port);
+ if (snum && snum < inet_prot_sock(net) &&
+ !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
+ return -EACCES;
+
+ if (with_lock)
+ lock_sock(sk);
+
+ /* Check these errors (active socket, double bind). */
+ if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ /* Check if the address belongs to the host. */
+ if (addr_type == IPV6_ADDR_MAPPED) {
+ int chk_addr_ret;
+
+ /* Binding to v4-mapped address on a v6-only socket
+ * makes no sense
+ */
+ if (sk->sk_ipv6only) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ /* Reproduce AF_INET checks to make the bindings consistent */
+ v4addr = addr->sin6_addr.s6_addr32[3];
+ chk_addr_ret = inet_addr_type(net, v4addr);
+ if (!inet_can_nonlocal_bind(net, inet) &&
+ v4addr != htonl(INADDR_ANY) &&
+ chk_addr_ret != RTN_LOCAL &&
+ chk_addr_ret != RTN_MULTICAST &&
+ chk_addr_ret != RTN_BROADCAST) {
+ err = -EADDRNOTAVAIL;
+ goto out;
+ }
+ } else {
+ if (addr_type != IPV6_ADDR_ANY) {
+ struct net_device *dev = NULL;
+
+ rcu_read_lock();
+ if (__ipv6_addr_needs_scope_id(addr_type)) {
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ addr->sin6_scope_id) {
+ /* Override any existing binding, if another one
+ * is supplied by user.
+ */
+ sk->sk_bound_dev_if = addr->sin6_scope_id;
+ }
+
+ /* Binding to link-local address requires an interface */
+ if (!sk->sk_bound_dev_if) {
+ err = -EINVAL;
+ goto out_unlock;
+ }
+ dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
+ if (!dev) {
+ err = -ENODEV;
+ goto out_unlock;
+ }
+ }
+
+ /* ipv4 addr of the socket is invalid. Only the
+ * unspecified and mapped address have a v4 equivalent.
+ */
+ v4addr = LOOPBACK4_IPV6;
+ if (!(addr_type & IPV6_ADDR_MULTICAST)) {
+ if (!ipv6_can_nonlocal_bind(net, inet) &&
+ !ipv6_chk_addr(net, &addr->sin6_addr,
+ dev, 0)) {
+ err = -EADDRNOTAVAIL;
+ goto out_unlock;
+ }
+ }
+ rcu_read_unlock();
+ }
+ }
+
+ inet->inet_rcv_saddr = v4addr;
+ inet->inet_saddr = v4addr;
+
+ sk->sk_v6_rcv_saddr = addr->sin6_addr;
+
+ if (!(addr_type & IPV6_ADDR_MULTICAST))
+ np->saddr = addr->sin6_addr;
+
+ saved_ipv6only = sk->sk_ipv6only;
+ if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
+ sk->sk_ipv6only = 1;
+
+ /* Make sure we are allowed to bind here. */
+ if (snum || !(inet->bind_address_no_port ||
+ force_bind_address_no_port)) {
+ if (sk->sk_prot->get_port(sk, snum)) {
+ sk->sk_ipv6only = saved_ipv6only;
+ inet_reset_saddr(sk);
+ err = -EADDRINUSE;
+ goto out;
+ }
+ err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
+ if (err) {
+ sk->sk_ipv6only = saved_ipv6only;
+ inet_reset_saddr(sk);
+ goto out;
+ }
+ }
+
+ if (addr_type != IPV6_ADDR_ANY)
+ sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
+ if (snum)
+ sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
+ inet->inet_sport = htons(inet->inet_num);
+ inet->inet_dport = 0;
+ inet->inet_daddr = 0;
+out:
+ if (with_lock)
+ release_sock(sk);
+ return err;
+out_unlock:
+ rcu_read_unlock();
+ goto out;
+}
+
+/* bind for INET6 API */
+int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+ struct sock *sk = sock->sk;
+ int err = 0;
+
+ /* If the socket has its own bind function then use it. */
+ if (sk->sk_prot->bind)
+ return sk->sk_prot->bind(sk, uaddr, addr_len);
+
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+
+ /* BPF prog is run before any checks are done so that if the prog
+ * changes context in a wrong way it will be caught.
+ */
+ err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
+ if (err)
+ return err;
+
+ return __inet6_bind(sk, uaddr, addr_len, false, true);
+}
+EXPORT_SYMBOL(inet6_bind);
+
+int inet6_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ if (!sk)
+ return -EINVAL;
+
+ /* Free mc lists */
+ ipv6_sock_mc_close(sk);
+
+ /* Free ac lists */
+ ipv6_sock_ac_close(sk);
+
+ return inet_release(sock);
+}
+EXPORT_SYMBOL(inet6_release);
+
+void inet6_destroy_sock(struct sock *sk)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sk_buff *skb;
+ struct ipv6_txoptions *opt;
+
+ /* Release rx options */
+
+ skb = xchg(&np->pktoptions, NULL);
+ if (skb)
+ kfree_skb(skb);
+
+ skb = xchg(&np->rxpmtu, NULL);
+ if (skb)
+ kfree_skb(skb);
+
+ /* Free flowlabels */
+ fl6_free_socklist(sk);
+
+ /* Free tx options */
+
+ opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
+ if (opt) {
+ atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
+ txopt_put(opt);
+ }
+}
+EXPORT_SYMBOL_GPL(inet6_destroy_sock);
+
+/*
+ * This does both peername and sockname.
+ */
+
+int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
+ int peer)
+{
+ struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
+ struct sock *sk = sock->sk;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ sin->sin6_family = AF_INET6;
+ sin->sin6_flowinfo = 0;
+ sin->sin6_scope_id = 0;
+ if (peer) {
+ if (!inet->inet_dport)
+ return -ENOTCONN;
+ if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
+ peer == 1)
+ return -ENOTCONN;
+ sin->sin6_port = inet->inet_dport;
+ sin->sin6_addr = sk->sk_v6_daddr;
+ if (np->sndflow)
+ sin->sin6_flowinfo = np->flow_label;
+ } else {
+ if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
+ sin->sin6_addr = np->saddr;
+ else
+ sin->sin6_addr = sk->sk_v6_rcv_saddr;
+
+ sin->sin6_port = inet->inet_sport;
+ }
+ sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
+ sk->sk_bound_dev_if);
+ return sizeof(*sin);
+}
+EXPORT_SYMBOL(inet6_getname);
+
+int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ struct sock *sk = sock->sk;
+ struct net *net = sock_net(sk);
+
+ switch (cmd) {
+ case SIOCGSTAMP:
+ return sock_get_timestamp(sk, (struct timeval __user *)arg);
+
+ case SIOCGSTAMPNS:
+ return sock_get_timestampns(sk, (struct timespec __user *)arg);
+
+ case SIOCADDRT:
+ case SIOCDELRT:
+
+ return ipv6_route_ioctl(net, cmd, (void __user *)arg);
+
+ case SIOCSIFADDR:
+ return addrconf_add_ifaddr(net, (void __user *) arg);
+ case SIOCDIFADDR:
+ return addrconf_del_ifaddr(net, (void __user *) arg);
+ case SIOCSIFDSTADDR:
+ return addrconf_set_dstaddr(net, (void __user *) arg);
+ default:
+ if (!sk->sk_prot->ioctl)
+ return -ENOIOCTLCMD;
+ return sk->sk_prot->ioctl(sk, cmd, arg);
+ }
+ /*NOTREACHED*/
+ return 0;
+}
+EXPORT_SYMBOL(inet6_ioctl);
+
+const struct proto_ops inet6_stream_ops = {
+ .family = PF_INET6,
+ .owner = THIS_MODULE,
+ .release = inet6_release,
+ .bind = inet6_bind,
+ .connect = inet_stream_connect, /* ok */
+ .socketpair = sock_no_socketpair, /* a do nothing */
+ .accept = inet_accept, /* ok */
+ .getname = inet6_getname,
+ .poll = tcp_poll, /* ok */
+ .ioctl = inet6_ioctl, /* must change */
+ .listen = inet_listen, /* ok */
+ .shutdown = inet_shutdown, /* ok */
+ .setsockopt = sock_common_setsockopt, /* ok */
+ .getsockopt = sock_common_getsockopt, /* ok */
+ .sendmsg = inet_sendmsg, /* ok */
+ .recvmsg = inet_recvmsg, /* ok */
+#ifdef CONFIG_MMU
+ .mmap = tcp_mmap,
+#endif
+ .sendpage = inet_sendpage,
+ .sendmsg_locked = tcp_sendmsg_locked,
+ .sendpage_locked = tcp_sendpage_locked,
+ .splice_read = tcp_splice_read,
+ .read_sock = tcp_read_sock,
+ .peek_len = tcp_peek_len,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+ .set_rcvlowat = tcp_set_rcvlowat,
+};
+
+const struct proto_ops inet6_dgram_ops = {
+ .family = PF_INET6,
+ .owner = THIS_MODULE,
+ .release = inet6_release,
+ .bind = inet6_bind,
+ .connect = inet_dgram_connect, /* ok */
+ .socketpair = sock_no_socketpair, /* a do nothing */
+ .accept = sock_no_accept, /* a do nothing */
+ .getname = inet6_getname,
+ .poll = udp_poll, /* ok */
+ .ioctl = inet6_ioctl, /* must change */
+ .listen = sock_no_listen, /* ok */
+ .shutdown = inet_shutdown, /* ok */
+ .setsockopt = sock_common_setsockopt, /* ok */
+ .getsockopt = sock_common_getsockopt, /* ok */
+ .sendmsg = inet_sendmsg, /* ok */
+ .recvmsg = inet_recvmsg, /* ok */
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+ .set_peek_off = sk_set_peek_off,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+};
+
+static const struct net_proto_family inet6_family_ops = {
+ .family = PF_INET6,
+ .create = inet6_create,
+ .owner = THIS_MODULE,
+};
+
+int inet6_register_protosw(struct inet_protosw *p)
+{
+ struct list_head *lh;
+ struct inet_protosw *answer;
+ struct list_head *last_perm;
+ int protocol = p->protocol;
+ int ret;
+
+ spin_lock_bh(&inetsw6_lock);
+
+ ret = -EINVAL;
+ if (p->type >= SOCK_MAX)
+ goto out_illegal;
+
+ /* If we are trying to override a permanent protocol, bail. */
+ answer = NULL;
+ ret = -EPERM;
+ last_perm = &inetsw6[p->type];
+ list_for_each(lh, &inetsw6[p->type]) {
+ answer = list_entry(lh, struct inet_protosw, list);
+
+ /* Check only the non-wild match. */
+ if (INET_PROTOSW_PERMANENT & answer->flags) {
+ if (protocol == answer->protocol)
+ break;
+ last_perm = lh;
+ }
+
+ answer = NULL;
+ }
+ if (answer)
+ goto out_permanent;
+
+ /* Add the new entry after the last permanent entry if any, so that
+ * the new entry does not override a permanent entry when matched with
+ * a wild-card protocol. But it is allowed to override any existing
+ * non-permanent entry. This means that when we remove this entry, the
+ * system automatically returns to the old behavior.
+ */
+ list_add_rcu(&p->list, last_perm);
+ ret = 0;
+out:
+ spin_unlock_bh(&inetsw6_lock);
+ return ret;
+
+out_permanent:
+ pr_err("Attempt to override permanent protocol %d\n", protocol);
+ goto out;
+
+out_illegal:
+ pr_err("Ignoring attempt to register invalid socket type %d\n",
+ p->type);
+ goto out;
+}
+EXPORT_SYMBOL(inet6_register_protosw);
+
+void
+inet6_unregister_protosw(struct inet_protosw *p)
+{
+ if (INET_PROTOSW_PERMANENT & p->flags) {
+ pr_err("Attempt to unregister permanent protocol %d\n",
+ p->protocol);
+ } else {
+ spin_lock_bh(&inetsw6_lock);
+ list_del_rcu(&p->list);
+ spin_unlock_bh(&inetsw6_lock);
+
+ synchronize_net();
+ }
+}
+EXPORT_SYMBOL(inet6_unregister_protosw);
+
+int inet6_sk_rebuild_header(struct sock *sk)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct dst_entry *dst;
+
+ dst = __sk_dst_check(sk, np->dst_cookie);
+
+ if (!dst) {
+ struct inet_sock *inet = inet_sk(sk);
+ struct in6_addr *final_p, final;
+ struct flowi6 fl6;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = sk->sk_protocol;
+ fl6.daddr = sk->sk_v6_daddr;
+ fl6.saddr = np->saddr;
+ fl6.flowlabel = np->flow_label;
+ fl6.flowi6_oif = sk->sk_bound_dev_if;
+ fl6.flowi6_mark = sk->sk_mark;
+ fl6.fl6_dport = inet->inet_dport;
+ fl6.fl6_sport = inet->inet_sport;
+ fl6.flowi6_uid = sk->sk_uid;
+ security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
+
+ rcu_read_lock();
+ final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
+ &final);
+ rcu_read_unlock();
+
+ dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
+ if (IS_ERR(dst)) {
+ sk->sk_route_caps = 0;
+ sk->sk_err_soft = -PTR_ERR(dst);
+ return PTR_ERR(dst);
+ }
+
+ ip6_dst_store(sk, dst, NULL, NULL);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
+
+bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
+ const struct inet6_skb_parm *opt)
+{
+ const struct ipv6_pinfo *np = inet6_sk(sk);
+
+ if (np->rxopt.all) {
+ if (((opt->flags & IP6SKB_HOPBYHOP) &&
+ (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
+ (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
+ np->rxopt.bits.rxflow) ||
+ (opt->srcrt && (np->rxopt.bits.srcrt ||
+ np->rxopt.bits.osrcrt)) ||
+ ((opt->dst1 || opt->dst0) &&
+ (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
+ return true;
+ }
+ return false;
+}
+EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
+
+static struct packet_type ipv6_packet_type __read_mostly = {
+ .type = cpu_to_be16(ETH_P_IPV6),
+ .func = ipv6_rcv,
+ .list_func = ipv6_list_rcv,
+};
+
+static int __init ipv6_packet_init(void)
+{
+ dev_add_pack(&ipv6_packet_type);
+ return 0;
+}
+
+static void ipv6_packet_cleanup(void)
+{
+ dev_remove_pack(&ipv6_packet_type);
+}
+
+static int __net_init ipv6_init_mibs(struct net *net)
+{
+ int i;
+
+ net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
+ if (!net->mib.udp_stats_in6)
+ return -ENOMEM;
+ net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
+ if (!net->mib.udplite_stats_in6)
+ goto err_udplite_mib;
+ net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
+ if (!net->mib.ipv6_statistics)
+ goto err_ip_mib;
+
+ for_each_possible_cpu(i) {
+ struct ipstats_mib *af_inet6_stats;
+ af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
+ u64_stats_init(&af_inet6_stats->syncp);
+ }
+
+
+ net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
+ if (!net->mib.icmpv6_statistics)
+ goto err_icmp_mib;
+ net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
+ GFP_KERNEL);
+ if (!net->mib.icmpv6msg_statistics)
+ goto err_icmpmsg_mib;
+ return 0;
+
+err_icmpmsg_mib:
+ free_percpu(net->mib.icmpv6_statistics);
+err_icmp_mib:
+ free_percpu(net->mib.ipv6_statistics);
+err_ip_mib:
+ free_percpu(net->mib.udplite_stats_in6);
+err_udplite_mib:
+ free_percpu(net->mib.udp_stats_in6);
+ return -ENOMEM;
+}
+
+static void ipv6_cleanup_mibs(struct net *net)
+{
+ free_percpu(net->mib.udp_stats_in6);
+ free_percpu(net->mib.udplite_stats_in6);
+ free_percpu(net->mib.ipv6_statistics);
+ free_percpu(net->mib.icmpv6_statistics);
+ kfree(net->mib.icmpv6msg_statistics);
+}
+
+static int __net_init inet6_net_init(struct net *net)
+{
+ int err = 0;
+
+ net->ipv6.sysctl.bindv6only = 0;
+ net->ipv6.sysctl.icmpv6_time = 1*HZ;
+ net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
+ net->ipv6.sysctl.flowlabel_consistency = 1;
+ net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
+ net->ipv6.sysctl.idgen_retries = 3;
+ net->ipv6.sysctl.idgen_delay = 1 * HZ;
+ net->ipv6.sysctl.flowlabel_state_ranges = 0;
+ net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
+ net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
+ net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
+ net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
+ atomic_set(&net->ipv6.fib6_sernum, 1);
+
+ err = ipv6_init_mibs(net);
+ if (err)
+ return err;
+#ifdef CONFIG_PROC_FS
+ err = udp6_proc_init(net);
+ if (err)
+ goto out;
+ err = tcp6_proc_init(net);
+ if (err)
+ goto proc_tcp6_fail;
+ err = ac6_proc_init(net);
+ if (err)
+ goto proc_ac6_fail;
+#endif
+ return err;
+
+#ifdef CONFIG_PROC_FS
+proc_ac6_fail:
+ tcp6_proc_exit(net);
+proc_tcp6_fail:
+ udp6_proc_exit(net);
+out:
+ ipv6_cleanup_mibs(net);
+ return err;
+#endif
+}
+
+static void __net_exit inet6_net_exit(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ udp6_proc_exit(net);
+ tcp6_proc_exit(net);
+ ac6_proc_exit(net);
+#endif
+ ipv6_cleanup_mibs(net);
+}
+
+static struct pernet_operations inet6_net_ops = {
+ .init = inet6_net_init,
+ .exit = inet6_net_exit,
+};
+
+static const struct ipv6_stub ipv6_stub_impl = {
+ .ipv6_sock_mc_join = ipv6_sock_mc_join,
+ .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
+ .ipv6_dst_lookup = ip6_dst_lookup,
+ .fib6_get_table = fib6_get_table,
+ .fib6_table_lookup = fib6_table_lookup,
+ .fib6_lookup = fib6_lookup,
+ .fib6_multipath_select = fib6_multipath_select,
+ .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
+ .udpv6_encap_enable = udpv6_encap_enable,
+ .ndisc_send_na = ndisc_send_na,
+ .nd_tbl = &nd_tbl,
+};
+
+static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
+ .inet6_bind = __inet6_bind,
+};
+
+static int __init inet6_init(void)
+{
+ struct list_head *r;
+ int err = 0;
+
+ sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
+
+ /* Register the socket-side information for inet6_create. */
+ for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
+ INIT_LIST_HEAD(r);
+
+ if (disable_ipv6_mod) {
+ pr_info("Loaded, but administratively disabled, reboot required to enable\n");
+ goto out;
+ }
+
+ err = proto_register(&tcpv6_prot, 1);
+ if (err)
+ goto out;
+
+ err = proto_register(&udpv6_prot, 1);
+ if (err)
+ goto out_unregister_tcp_proto;
+
+ err = proto_register(&udplitev6_prot, 1);
+ if (err)
+ goto out_unregister_udp_proto;
+
+ err = proto_register(&rawv6_prot, 1);
+ if (err)
+ goto out_unregister_udplite_proto;
+
+ err = proto_register(&pingv6_prot, 1);
+ if (err)
+ goto out_unregister_raw_proto;
+
+ /* We MUST register RAW sockets before we create the ICMP6,
+ * IGMP6, or NDISC control sockets.
+ */
+ err = rawv6_init();
+ if (err)
+ goto out_unregister_ping_proto;
+
+ /* Register the family here so that the init calls below will
+ * be able to create sockets. (?? is this dangerous ??)
+ */
+ err = sock_register(&inet6_family_ops);
+ if (err)
+ goto out_sock_register_fail;
+
+ /*
+ * ipngwg API draft makes clear that the correct semantics
+ * for TCP and UDP is to consider one TCP and UDP instance
+ * in a host available by both INET and INET6 APIs and
+ * able to communicate via both network protocols.
+ */
+
+ err = register_pernet_subsys(&inet6_net_ops);
+ if (err)
+ goto register_pernet_fail;
+ err = ip6_mr_init();
+ if (err)
+ goto ipmr_fail;
+ err = icmpv6_init();
+ if (err)
+ goto icmp_fail;
+ err = ndisc_init();
+ if (err)
+ goto ndisc_fail;
+ err = igmp6_init();
+ if (err)
+ goto igmp_fail;
+
+ err = ipv6_netfilter_init();
+ if (err)
+ goto netfilter_fail;
+ /* Create /proc/foo6 entries. */
+#ifdef CONFIG_PROC_FS
+ err = -ENOMEM;
+ if (raw6_proc_init())
+ goto proc_raw6_fail;
+ if (udplite6_proc_init())
+ goto proc_udplite6_fail;
+ if (ipv6_misc_proc_init())
+ goto proc_misc6_fail;
+ if (if6_proc_init())
+ goto proc_if6_fail;
+#endif
+ err = ip6_route_init();
+ if (err)
+ goto ip6_route_fail;
+ err = ndisc_late_init();
+ if (err)
+ goto ndisc_late_fail;
+ err = ip6_flowlabel_init();
+ if (err)
+ goto ip6_flowlabel_fail;
+ err = addrconf_init();
+ if (err)
+ goto addrconf_fail;
+
+ /* Init v6 extension headers. */
+ err = ipv6_exthdrs_init();
+ if (err)
+ goto ipv6_exthdrs_fail;
+
+ err = ipv6_frag_init();
+ if (err)
+ goto ipv6_frag_fail;
+
+ /* Init v6 transport protocols. */
+ err = udpv6_init();
+ if (err)
+ goto udpv6_fail;
+
+ err = udplitev6_init();
+ if (err)
+ goto udplitev6_fail;
+
+ err = udpv6_offload_init();
+ if (err)
+ goto udpv6_offload_fail;
+
+ err = tcpv6_init();
+ if (err)
+ goto tcpv6_fail;
+
+ err = ipv6_packet_init();
+ if (err)
+ goto ipv6_packet_fail;
+
+ err = pingv6_init();
+ if (err)
+ goto pingv6_fail;
+
+ err = calipso_init();
+ if (err)
+ goto calipso_fail;
+
+ err = seg6_init();
+ if (err)
+ goto seg6_fail;
+
+ err = igmp6_late_init();
+ if (err)
+ goto igmp6_late_err;
+
+#ifdef CONFIG_SYSCTL
+ err = ipv6_sysctl_register();
+ if (err)
+ goto sysctl_fail;
+#endif
+
+ /* ensure that ipv6 stubs are visible only after ipv6 is ready */
+ wmb();
+ ipv6_stub = &ipv6_stub_impl;
+ ipv6_bpf_stub = &ipv6_bpf_stub_impl;
+out:
+ return err;
+
+#ifdef CONFIG_SYSCTL
+sysctl_fail:
+ igmp6_late_cleanup();
+#endif
+igmp6_late_err:
+ seg6_exit();
+seg6_fail:
+ calipso_exit();
+calipso_fail:
+ pingv6_exit();
+pingv6_fail:
+ ipv6_packet_cleanup();
+ipv6_packet_fail:
+ tcpv6_exit();
+tcpv6_fail:
+ udpv6_offload_exit();
+udpv6_offload_fail:
+ udplitev6_exit();
+udplitev6_fail:
+ udpv6_exit();
+udpv6_fail:
+ ipv6_frag_exit();
+ipv6_frag_fail:
+ ipv6_exthdrs_exit();
+ipv6_exthdrs_fail:
+ addrconf_cleanup();
+addrconf_fail:
+ ip6_flowlabel_cleanup();
+ip6_flowlabel_fail:
+ ndisc_late_cleanup();
+ndisc_late_fail:
+ ip6_route_cleanup();
+ip6_route_fail:
+#ifdef CONFIG_PROC_FS
+ if6_proc_exit();
+proc_if6_fail:
+ ipv6_misc_proc_exit();
+proc_misc6_fail:
+ udplite6_proc_exit();
+proc_udplite6_fail:
+ raw6_proc_exit();
+proc_raw6_fail:
+#endif
+ ipv6_netfilter_fini();
+netfilter_fail:
+ igmp6_cleanup();
+igmp_fail:
+ ndisc_cleanup();
+ndisc_fail:
+ icmpv6_cleanup();
+icmp_fail:
+ ip6_mr_cleanup();
+ipmr_fail:
+ unregister_pernet_subsys(&inet6_net_ops);
+register_pernet_fail:
+ sock_unregister(PF_INET6);
+ rtnl_unregister_all(PF_INET6);
+out_sock_register_fail:
+ rawv6_exit();
+out_unregister_ping_proto:
+ proto_unregister(&pingv6_prot);
+out_unregister_raw_proto:
+ proto_unregister(&rawv6_prot);
+out_unregister_udplite_proto:
+ proto_unregister(&udplitev6_prot);
+out_unregister_udp_proto:
+ proto_unregister(&udpv6_prot);
+out_unregister_tcp_proto:
+ proto_unregister(&tcpv6_prot);
+ goto out;
+}
+module_init(inet6_init);
+
+MODULE_ALIAS_NETPROTO(PF_INET6);
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
new file mode 100644
index 0000000..78c9743
--- /dev/null
+++ b/net/ipv6/ah6.c
@@ -0,0 +1,817 @@
+/*
+ * Copyright (C)2002 USAGI/WIDE Project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors
+ *
+ * Mitsuru KANDA @USAGI : IPv6 Support
+ * Kazunori MIYAZAWA @USAGI :
+ * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ *
+ * This file is derived from net/ipv4/ah.c.
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <crypto/algapi.h>
+#include <crypto/hash.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <net/ip.h>
+#include <net/ah.h>
+#include <linux/crypto.h>
+#include <linux/pfkeyv2.h>
+#include <linux/string.h>
+#include <linux/scatterlist.h>
+#include <net/ip6_route.h>
+#include <net/icmp.h>
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/xfrm.h>
+
+#define IPV6HDR_BASELEN 8
+
+struct tmp_ext {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ struct in6_addr saddr;
+#endif
+ struct in6_addr daddr;
+ char hdrs[0];
+};
+
+struct ah_skb_cb {
+ struct xfrm_skb_cb xfrm;
+ void *tmp;
+};
+
+#define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
+
+static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
+ unsigned int size)
+{
+ unsigned int len;
+
+ len = size + crypto_ahash_digestsize(ahash) +
+ (crypto_ahash_alignmask(ahash) &
+ ~(crypto_tfm_ctx_alignment() - 1));
+
+ len = ALIGN(len, crypto_tfm_ctx_alignment());
+
+ len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);
+ len = ALIGN(len, __alignof__(struct scatterlist));
+
+ len += sizeof(struct scatterlist) * nfrags;
+
+ return kmalloc(len, GFP_ATOMIC);
+}
+
+static inline struct tmp_ext *ah_tmp_ext(void *base)
+{
+ return base + IPV6HDR_BASELEN;
+}
+
+static inline u8 *ah_tmp_auth(u8 *tmp, unsigned int offset)
+{
+ return tmp + offset;
+}
+
+static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
+ unsigned int offset)
+{
+ return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
+}
+
+static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
+ u8 *icv)
+{
+ struct ahash_request *req;
+
+ req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),
+ crypto_tfm_ctx_alignment());
+
+ ahash_request_set_tfm(req, ahash);
+
+ return req;
+}
+
+static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
+ struct ahash_request *req)
+{
+ return (void *)ALIGN((unsigned long)(req + 1) +
+ crypto_ahash_reqsize(ahash),
+ __alignof__(struct scatterlist));
+}
+
+static bool zero_out_mutable_opts(struct ipv6_opt_hdr *opthdr)
+{
+ u8 *opt = (u8 *)opthdr;
+ int len = ipv6_optlen(opthdr);
+ int off = 0;
+ int optlen = 0;
+
+ off += 2;
+ len -= 2;
+
+ while (len > 0) {
+
+ switch (opt[off]) {
+
+ case IPV6_TLV_PAD1:
+ optlen = 1;
+ break;
+ default:
+ if (len < 2)
+ goto bad;
+ optlen = opt[off+1]+2;
+ if (len < optlen)
+ goto bad;
+ if (opt[off] & 0x20)
+ memset(&opt[off+2], 0, opt[off+1]);
+ break;
+ }
+
+ off += optlen;
+ len -= optlen;
+ }
+ if (len == 0)
+ return true;
+
+bad:
+ return false;
+}
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+/**
+ * ipv6_rearrange_destopt - rearrange IPv6 destination options header
+ * @iph: IPv6 header
+ * @destopt: destionation options header
+ */
+static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt)
+{
+ u8 *opt = (u8 *)destopt;
+ int len = ipv6_optlen(destopt);
+ int off = 0;
+ int optlen = 0;
+
+ off += 2;
+ len -= 2;
+
+ while (len > 0) {
+
+ switch (opt[off]) {
+
+ case IPV6_TLV_PAD1:
+ optlen = 1;
+ break;
+ default:
+ if (len < 2)
+ goto bad;
+ optlen = opt[off+1]+2;
+ if (len < optlen)
+ goto bad;
+
+ /* Rearrange the source address in @iph and the
+ * addresses in home address option for final source.
+ * See 11.3.2 of RFC 3775 for details.
+ */
+ if (opt[off] == IPV6_TLV_HAO) {
+ struct in6_addr final_addr;
+ struct ipv6_destopt_hao *hao;
+
+ hao = (struct ipv6_destopt_hao *)&opt[off];
+ if (hao->length != sizeof(hao->addr)) {
+ net_warn_ratelimited("destopt hao: invalid header length: %u\n",
+ hao->length);
+ goto bad;
+ }
+ final_addr = hao->addr;
+ hao->addr = iph->saddr;
+ iph->saddr = final_addr;
+ }
+ break;
+ }
+
+ off += optlen;
+ len -= optlen;
+ }
+ /* Note: ok if len == 0 */
+bad:
+ return;
+}
+#else
+static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) {}
+#endif
+
+/**
+ * ipv6_rearrange_rthdr - rearrange IPv6 routing header
+ * @iph: IPv6 header
+ * @rthdr: routing header
+ *
+ * Rearrange the destination address in @iph and the addresses in @rthdr
+ * so that they appear in the order they will at the final destination.
+ * See Appendix A2 of RFC 2402 for details.
+ */
+static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr)
+{
+ int segments, segments_left;
+ struct in6_addr *addrs;
+ struct in6_addr final_addr;
+
+ segments_left = rthdr->segments_left;
+ if (segments_left == 0)
+ return;
+ rthdr->segments_left = 0;
+
+ /* The value of rthdr->hdrlen has been verified either by the system
+ * call if it is locally generated, or by ipv6_rthdr_rcv() for incoming
+ * packets. So we can assume that it is even and that segments is
+ * greater than or equal to segments_left.
+ *
+ * For the same reason we can assume that this option is of type 0.
+ */
+ segments = rthdr->hdrlen >> 1;
+
+ addrs = ((struct rt0_hdr *)rthdr)->addr;
+ final_addr = addrs[segments - 1];
+
+ addrs += segments - segments_left;
+ memmove(addrs + 1, addrs, (segments_left - 1) * sizeof(*addrs));
+
+ addrs[0] = iph->daddr;
+ iph->daddr = final_addr;
+}
+
+static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
+{
+ union {
+ struct ipv6hdr *iph;
+ struct ipv6_opt_hdr *opth;
+ struct ipv6_rt_hdr *rth;
+ char *raw;
+ } exthdr = { .iph = iph };
+ char *end = exthdr.raw + len;
+ int nexthdr = iph->nexthdr;
+
+ exthdr.iph++;
+
+ while (exthdr.raw < end) {
+ switch (nexthdr) {
+ case NEXTHDR_DEST:
+ if (dir == XFRM_POLICY_OUT)
+ ipv6_rearrange_destopt(iph, exthdr.opth);
+ /* fall through */
+ case NEXTHDR_HOP:
+ if (!zero_out_mutable_opts(exthdr.opth)) {
+ net_dbg_ratelimited("overrun %sopts\n",
+ nexthdr == NEXTHDR_HOP ?
+ "hop" : "dest");
+ return -EINVAL;
+ }
+ break;
+
+ case NEXTHDR_ROUTING:
+ ipv6_rearrange_rthdr(iph, exthdr.rth);
+ break;
+
+ default:
+ return 0;
+ }
+
+ nexthdr = exthdr.opth->nexthdr;
+ exthdr.raw += ipv6_optlen(exthdr.opth);
+ }
+
+ return 0;
+}
+
+static void ah6_output_done(struct crypto_async_request *base, int err)
+{
+ int extlen;
+ u8 *iph_base;
+ u8 *icv;
+ struct sk_buff *skb = base->data;
+ struct xfrm_state *x = skb_dst(skb)->xfrm;
+ struct ah_data *ahp = x->data;
+ struct ipv6hdr *top_iph = ipv6_hdr(skb);
+ struct ip_auth_hdr *ah = ip_auth_hdr(skb);
+ struct tmp_ext *iph_ext;
+
+ extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr);
+ if (extlen)
+ extlen += sizeof(*iph_ext);
+
+ iph_base = AH_SKB_CB(skb)->tmp;
+ iph_ext = ah_tmp_ext(iph_base);
+ icv = ah_tmp_icv(ahp->ahash, iph_ext, extlen);
+
+ memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
+ memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
+
+ if (extlen) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ memcpy(&top_iph->saddr, iph_ext, extlen);
+#else
+ memcpy(&top_iph->daddr, iph_ext, extlen);
+#endif
+ }
+
+ kfree(AH_SKB_CB(skb)->tmp);
+ xfrm_output_resume(skb, err);
+}
+
+static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int err;
+ int nfrags;
+ int extlen;
+ u8 *iph_base;
+ u8 *icv;
+ u8 nexthdr;
+ struct sk_buff *trailer;
+ struct crypto_ahash *ahash;
+ struct ahash_request *req;
+ struct scatterlist *sg;
+ struct ipv6hdr *top_iph;
+ struct ip_auth_hdr *ah;
+ struct ah_data *ahp;
+ struct tmp_ext *iph_ext;
+ int seqhi_len = 0;
+ __be32 *seqhi;
+ int sglists = 0;
+ struct scatterlist *seqhisg;
+
+ ahp = x->data;
+ ahash = ahp->ahash;
+
+ err = skb_cow_data(skb, 0, &trailer);
+ if (err < 0)
+ goto out;
+ nfrags = err;
+
+ skb_push(skb, -skb_network_offset(skb));
+ extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr);
+ if (extlen)
+ extlen += sizeof(*iph_ext);
+
+ if (x->props.flags & XFRM_STATE_ESN) {
+ sglists = 1;
+ seqhi_len = sizeof(*seqhi);
+ }
+ err = -ENOMEM;
+ iph_base = ah_alloc_tmp(ahash, nfrags + sglists, IPV6HDR_BASELEN +
+ extlen + seqhi_len);
+ if (!iph_base)
+ goto out;
+
+ iph_ext = ah_tmp_ext(iph_base);
+ seqhi = (__be32 *)((char *)iph_ext + extlen);
+ icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
+ req = ah_tmp_req(ahash, icv);
+ sg = ah_req_sg(ahash, req);
+ seqhisg = sg + nfrags;
+
+ ah = ip_auth_hdr(skb);
+ memset(ah->auth_data, 0, ahp->icv_trunc_len);
+
+ top_iph = ipv6_hdr(skb);
+ top_iph->payload_len = htons(skb->len - sizeof(*top_iph));
+
+ nexthdr = *skb_mac_header(skb);
+ *skb_mac_header(skb) = IPPROTO_AH;
+
+ /* When there are no extension headers, we only need to save the first
+ * 8 bytes of the base IP header.
+ */
+ memcpy(iph_base, top_iph, IPV6HDR_BASELEN);
+
+ if (extlen) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ memcpy(iph_ext, &top_iph->saddr, extlen);
+#else
+ memcpy(iph_ext, &top_iph->daddr, extlen);
+#endif
+ err = ipv6_clear_mutable_options(top_iph,
+ extlen - sizeof(*iph_ext) +
+ sizeof(*top_iph),
+ XFRM_POLICY_OUT);
+ if (err)
+ goto out_free;
+ }
+
+ ah->nexthdr = nexthdr;
+
+ top_iph->priority = 0;
+ top_iph->flow_lbl[0] = 0;
+ top_iph->flow_lbl[1] = 0;
+ top_iph->flow_lbl[2] = 0;
+ top_iph->hop_limit = 0;
+
+ ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
+
+ ah->reserved = 0;
+ ah->spi = x->id.spi;
+ ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
+
+ sg_init_table(sg, nfrags + sglists);
+ err = skb_to_sgvec_nomark(skb, sg, 0, skb->len);
+ if (unlikely(err < 0))
+ goto out_free;
+
+ if (x->props.flags & XFRM_STATE_ESN) {
+ /* Attach seqhi sg right after packet payload */
+ *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
+ sg_set_buf(seqhisg, seqhi, seqhi_len);
+ }
+ ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
+ ahash_request_set_callback(req, 0, ah6_output_done, skb);
+
+ AH_SKB_CB(skb)->tmp = iph_base;
+
+ err = crypto_ahash_digest(req);
+ if (err) {
+ if (err == -EINPROGRESS)
+ goto out;
+
+ if (err == -ENOSPC)
+ err = NET_XMIT_DROP;
+ goto out_free;
+ }
+
+ memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
+ memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
+
+ if (extlen) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ memcpy(&top_iph->saddr, iph_ext, extlen);
+#else
+ memcpy(&top_iph->daddr, iph_ext, extlen);
+#endif
+ }
+
+out_free:
+ kfree(iph_base);
+out:
+ return err;
+}
+
+static void ah6_input_done(struct crypto_async_request *base, int err)
+{
+ u8 *auth_data;
+ u8 *icv;
+ u8 *work_iph;
+ struct sk_buff *skb = base->data;
+ struct xfrm_state *x = xfrm_input_state(skb);
+ struct ah_data *ahp = x->data;
+ struct ip_auth_hdr *ah = ip_auth_hdr(skb);
+ int hdr_len = skb_network_header_len(skb);
+ int ah_hlen = (ah->hdrlen + 2) << 2;
+
+ if (err)
+ goto out;
+
+ work_iph = AH_SKB_CB(skb)->tmp;
+ auth_data = ah_tmp_auth(work_iph, hdr_len);
+ icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
+
+ err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
+ if (err)
+ goto out;
+
+ err = ah->nexthdr;
+
+ skb->network_header += ah_hlen;
+ memcpy(skb_network_header(skb), work_iph, hdr_len);
+ __skb_pull(skb, ah_hlen + hdr_len);
+ if (x->props.mode == XFRM_MODE_TUNNEL)
+ skb_reset_transport_header(skb);
+ else
+ skb_set_transport_header(skb, -hdr_len);
+out:
+ kfree(AH_SKB_CB(skb)->tmp);
+ xfrm_input_resume(skb, err);
+}
+
+
+
+static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ /*
+ * Before process AH
+ * [IPv6][Ext1][Ext2][AH][Dest][Payload]
+ * |<-------------->| hdr_len
+ *
+ * To erase AH:
+ * Keeping copy of cleared headers. After AH processing,
+ * Moving the pointer of skb->network_header by using skb_pull as long
+ * as AH header length. Then copy back the copy as long as hdr_len
+ * If destination header following AH exists, copy it into after [Ext2].
+ *
+ * |<>|[IPv6][Ext1][Ext2][Dest][Payload]
+ * There is offset of AH before IPv6 header after the process.
+ */
+
+ u8 *auth_data;
+ u8 *icv;
+ u8 *work_iph;
+ struct sk_buff *trailer;
+ struct crypto_ahash *ahash;
+ struct ahash_request *req;
+ struct scatterlist *sg;
+ struct ip_auth_hdr *ah;
+ struct ipv6hdr *ip6h;
+ struct ah_data *ahp;
+ u16 hdr_len;
+ u16 ah_hlen;
+ int nexthdr;
+ int nfrags;
+ int err = -ENOMEM;
+ int seqhi_len = 0;
+ __be32 *seqhi;
+ int sglists = 0;
+ struct scatterlist *seqhisg;
+
+ if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr)))
+ goto out;
+
+ /* We are going to _remove_ AH header to keep sockets happy,
+ * so... Later this can change. */
+ if (skb_unclone(skb, GFP_ATOMIC))
+ goto out;
+
+ skb->ip_summed = CHECKSUM_NONE;
+
+ hdr_len = skb_network_header_len(skb);
+ ah = (struct ip_auth_hdr *)skb->data;
+ ahp = x->data;
+ ahash = ahp->ahash;
+
+ nexthdr = ah->nexthdr;
+ ah_hlen = (ah->hdrlen + 2) << 2;
+
+ if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) &&
+ ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len))
+ goto out;
+
+ if (!pskb_may_pull(skb, ah_hlen))
+ goto out;
+
+ err = skb_cow_data(skb, 0, &trailer);
+ if (err < 0)
+ goto out;
+ nfrags = err;
+
+ ah = (struct ip_auth_hdr *)skb->data;
+ ip6h = ipv6_hdr(skb);
+
+ skb_push(skb, hdr_len);
+
+ if (x->props.flags & XFRM_STATE_ESN) {
+ sglists = 1;
+ seqhi_len = sizeof(*seqhi);
+ }
+
+ work_iph = ah_alloc_tmp(ahash, nfrags + sglists, hdr_len +
+ ahp->icv_trunc_len + seqhi_len);
+ if (!work_iph) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ auth_data = ah_tmp_auth((u8 *)work_iph, hdr_len);
+ seqhi = (__be32 *)(auth_data + ahp->icv_trunc_len);
+ icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
+ req = ah_tmp_req(ahash, icv);
+ sg = ah_req_sg(ahash, req);
+ seqhisg = sg + nfrags;
+
+ memcpy(work_iph, ip6h, hdr_len);
+ memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
+ memset(ah->auth_data, 0, ahp->icv_trunc_len);
+
+ if (ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN))
+ goto out_free;
+
+ ip6h->priority = 0;
+ ip6h->flow_lbl[0] = 0;
+ ip6h->flow_lbl[1] = 0;
+ ip6h->flow_lbl[2] = 0;
+ ip6h->hop_limit = 0;
+
+ sg_init_table(sg, nfrags + sglists);
+ err = skb_to_sgvec_nomark(skb, sg, 0, skb->len);
+ if (unlikely(err < 0))
+ goto out_free;
+
+ if (x->props.flags & XFRM_STATE_ESN) {
+ /* Attach seqhi sg right after packet payload */
+ *seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
+ sg_set_buf(seqhisg, seqhi, seqhi_len);
+ }
+
+ ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
+ ahash_request_set_callback(req, 0, ah6_input_done, skb);
+
+ AH_SKB_CB(skb)->tmp = work_iph;
+
+ err = crypto_ahash_digest(req);
+ if (err) {
+ if (err == -EINPROGRESS)
+ goto out;
+
+ goto out_free;
+ }
+
+ err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
+ if (err)
+ goto out_free;
+
+ skb->network_header += ah_hlen;
+ memcpy(skb_network_header(skb), work_iph, hdr_len);
+ __skb_pull(skb, ah_hlen + hdr_len);
+
+ if (x->props.mode == XFRM_MODE_TUNNEL)
+ skb_reset_transport_header(skb);
+ else
+ skb_set_transport_header(skb, -hdr_len);
+
+ err = nexthdr;
+
+out_free:
+ kfree(work_iph);
+out:
+ return err;
+}
+
+static int ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct net *net = dev_net(skb->dev);
+ struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
+ struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+offset);
+ struct xfrm_state *x;
+
+ if (type != ICMPV6_PKT_TOOBIG &&
+ type != NDISC_REDIRECT)
+ return 0;
+
+ x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6);
+ if (!x)
+ return 0;
+
+ if (type == NDISC_REDIRECT)
+ ip6_redirect(skb, net, skb->dev->ifindex, 0,
+ sock_net_uid(net, NULL));
+ else
+ ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
+ xfrm_state_put(x);
+
+ return 0;
+}
+
+static int ah6_init_state(struct xfrm_state *x)
+{
+ struct ah_data *ahp = NULL;
+ struct xfrm_algo_desc *aalg_desc;
+ struct crypto_ahash *ahash;
+
+ if (!x->aalg)
+ goto error;
+
+ if (x->encap)
+ goto error;
+
+ ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
+ if (!ahp)
+ return -ENOMEM;
+
+ ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
+ if (IS_ERR(ahash))
+ goto error;
+
+ ahp->ahash = ahash;
+ if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
+ (x->aalg->alg_key_len + 7) / 8))
+ goto error;
+
+ /*
+ * Lookup the algorithm description maintained by xfrm_algo,
+ * verify crypto transform properties, and store information
+ * we need for AH processing. This lookup cannot fail here
+ * after a successful crypto_alloc_hash().
+ */
+ aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
+ BUG_ON(!aalg_desc);
+
+ if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
+ crypto_ahash_digestsize(ahash)) {
+ pr_info("AH: %s digestsize %u != %hu\n",
+ x->aalg->alg_name, crypto_ahash_digestsize(ahash),
+ aalg_desc->uinfo.auth.icv_fullbits/8);
+ goto error;
+ }
+
+ ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
+ ahp->icv_trunc_len = x->aalg->alg_trunc_len/8;
+
+ x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
+ ahp->icv_trunc_len);
+ switch (x->props.mode) {
+ case XFRM_MODE_BEET:
+ case XFRM_MODE_TRANSPORT:
+ break;
+ case XFRM_MODE_TUNNEL:
+ x->props.header_len += sizeof(struct ipv6hdr);
+ break;
+ default:
+ goto error;
+ }
+ x->data = ahp;
+
+ return 0;
+
+error:
+ if (ahp) {
+ crypto_free_ahash(ahp->ahash);
+ kfree(ahp);
+ }
+ return -EINVAL;
+}
+
+static void ah6_destroy(struct xfrm_state *x)
+{
+ struct ah_data *ahp = x->data;
+
+ if (!ahp)
+ return;
+
+ crypto_free_ahash(ahp->ahash);
+ kfree(ahp);
+}
+
+static int ah6_rcv_cb(struct sk_buff *skb, int err)
+{
+ return 0;
+}
+
+static const struct xfrm_type ah6_type = {
+ .description = "AH6",
+ .owner = THIS_MODULE,
+ .proto = IPPROTO_AH,
+ .flags = XFRM_TYPE_REPLAY_PROT,
+ .init_state = ah6_init_state,
+ .destructor = ah6_destroy,
+ .input = ah6_input,
+ .output = ah6_output,
+ .hdr_offset = xfrm6_find_1stfragopt,
+};
+
+static struct xfrm6_protocol ah6_protocol = {
+ .handler = xfrm6_rcv,
+ .cb_handler = ah6_rcv_cb,
+ .err_handler = ah6_err,
+ .priority = 0,
+};
+
+static int __init ah6_init(void)
+{
+ if (xfrm_register_type(&ah6_type, AF_INET6) < 0) {
+ pr_info("%s: can't add xfrm type\n", __func__);
+ return -EAGAIN;
+ }
+
+ if (xfrm6_protocol_register(&ah6_protocol, IPPROTO_AH) < 0) {
+ pr_info("%s: can't add protocol\n", __func__);
+ xfrm_unregister_type(&ah6_type, AF_INET6);
+ return -EAGAIN;
+ }
+
+ return 0;
+}
+
+static void __exit ah6_fini(void)
+{
+ if (xfrm6_protocol_deregister(&ah6_protocol, IPPROTO_AH) < 0)
+ pr_info("%s: can't remove protocol\n", __func__);
+
+ if (xfrm_unregister_type(&ah6_type, AF_INET6) < 0)
+ pr_info("%s: can't remove xfrm type\n", __func__);
+
+}
+
+module_init(ah6_init);
+module_exit(ah6_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_AH);
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
new file mode 100644
index 0000000..4e0ff70
--- /dev/null
+++ b/net/ipv6/anycast.c
@@ -0,0 +1,542 @@
+/*
+ * Anycast support for IPv6
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * David L Stevens (dlstevens@us.ibm.com)
+ *
+ * based heavily on net/ipv6/mcast.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/capability.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/random.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/route.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/if_inet6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+
+#include <net/checksum.h>
+
+static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr);
+
+/*
+ * socket join an anycast group
+ */
+
+int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct net_device *dev = NULL;
+ struct inet6_dev *idev;
+ struct ipv6_ac_socklist *pac;
+ struct net *net = sock_net(sk);
+ int ishost = !net->ipv6.devconf_all->forwarding;
+ int err = 0;
+
+ ASSERT_RTNL();
+
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+ if (ipv6_addr_is_multicast(addr))
+ return -EINVAL;
+
+ if (ifindex)
+ dev = __dev_get_by_index(net, ifindex);
+
+ if (ipv6_chk_addr_and_flags(net, addr, dev, true, 0, IFA_F_TENTATIVE))
+ return -EINVAL;
+
+ pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL);
+ if (!pac)
+ return -ENOMEM;
+ pac->acl_next = NULL;
+ pac->acl_addr = *addr;
+
+ if (ifindex == 0) {
+ struct rt6_info *rt;
+
+ rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
+ if (rt) {
+ dev = rt->dst.dev;
+ ip6_rt_put(rt);
+ } else if (ishost) {
+ err = -EADDRNOTAVAIL;
+ goto error;
+ } else {
+ /* router, no matching interface: just pick one */
+ dev = __dev_get_by_flags(net, IFF_UP,
+ IFF_UP | IFF_LOOPBACK);
+ }
+ }
+
+ if (!dev) {
+ err = -ENODEV;
+ goto error;
+ }
+
+ idev = __in6_dev_get(dev);
+ if (!idev) {
+ if (ifindex)
+ err = -ENODEV;
+ else
+ err = -EADDRNOTAVAIL;
+ goto error;
+ }
+ /* reset ishost, now that we have a specific device */
+ ishost = !idev->cnf.forwarding;
+
+ pac->acl_ifindex = dev->ifindex;
+
+ /* XXX
+ * For hosts, allow link-local or matching prefix anycasts.
+ * This obviates the need for propagating anycast routes while
+ * still allowing some non-router anycast participation.
+ */
+ if (!ipv6_chk_prefix(addr, dev)) {
+ if (ishost)
+ err = -EADDRNOTAVAIL;
+ if (err)
+ goto error;
+ }
+
+ err = __ipv6_dev_ac_inc(idev, addr);
+ if (!err) {
+ pac->acl_next = np->ipv6_ac_list;
+ np->ipv6_ac_list = pac;
+ pac = NULL;
+ }
+
+error:
+ if (pac)
+ sock_kfree_s(sk, pac, sizeof(*pac));
+ return err;
+}
+
+/*
+ * socket leave an anycast group
+ */
+int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct net_device *dev;
+ struct ipv6_ac_socklist *pac, *prev_pac;
+ struct net *net = sock_net(sk);
+
+ ASSERT_RTNL();
+
+ prev_pac = NULL;
+ for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) {
+ if ((ifindex == 0 || pac->acl_ifindex == ifindex) &&
+ ipv6_addr_equal(&pac->acl_addr, addr))
+ break;
+ prev_pac = pac;
+ }
+ if (!pac)
+ return -ENOENT;
+ if (prev_pac)
+ prev_pac->acl_next = pac->acl_next;
+ else
+ np->ipv6_ac_list = pac->acl_next;
+
+ dev = __dev_get_by_index(net, pac->acl_ifindex);
+ if (dev)
+ ipv6_dev_ac_dec(dev, &pac->acl_addr);
+
+ sock_kfree_s(sk, pac, sizeof(*pac));
+ return 0;
+}
+
+void ipv6_sock_ac_close(struct sock *sk)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct net_device *dev = NULL;
+ struct ipv6_ac_socklist *pac;
+ struct net *net = sock_net(sk);
+ int prev_index;
+
+ if (!np->ipv6_ac_list)
+ return;
+
+ rtnl_lock();
+ pac = np->ipv6_ac_list;
+ np->ipv6_ac_list = NULL;
+
+ prev_index = 0;
+ while (pac) {
+ struct ipv6_ac_socklist *next = pac->acl_next;
+
+ if (pac->acl_ifindex != prev_index) {
+ dev = __dev_get_by_index(net, pac->acl_ifindex);
+ prev_index = pac->acl_ifindex;
+ }
+ if (dev)
+ ipv6_dev_ac_dec(dev, &pac->acl_addr);
+ sock_kfree_s(sk, pac, sizeof(*pac));
+ pac = next;
+ }
+ rtnl_unlock();
+}
+
+static void aca_get(struct ifacaddr6 *aca)
+{
+ refcount_inc(&aca->aca_refcnt);
+}
+
+static void aca_put(struct ifacaddr6 *ac)
+{
+ if (refcount_dec_and_test(&ac->aca_refcnt)) {
+ fib6_info_release(ac->aca_rt);
+ kfree(ac);
+ }
+}
+
+static struct ifacaddr6 *aca_alloc(struct fib6_info *f6i,
+ const struct in6_addr *addr)
+{
+ struct ifacaddr6 *aca;
+
+ aca = kzalloc(sizeof(*aca), GFP_ATOMIC);
+ if (!aca)
+ return NULL;
+
+ aca->aca_addr = *addr;
+ fib6_info_hold(f6i);
+ aca->aca_rt = f6i;
+ aca->aca_users = 1;
+ /* aca_tstamp should be updated upon changes */
+ aca->aca_cstamp = aca->aca_tstamp = jiffies;
+ refcount_set(&aca->aca_refcnt, 1);
+
+ return aca;
+}
+
+/*
+ * device anycast group inc (add if not found)
+ */
+int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
+{
+ struct ifacaddr6 *aca;
+ struct fib6_info *f6i;
+ struct net *net;
+ int err;
+
+ ASSERT_RTNL();
+
+ write_lock_bh(&idev->lock);
+ if (idev->dead) {
+ err = -ENODEV;
+ goto out;
+ }
+
+ for (aca = idev->ac_list; aca; aca = aca->aca_next) {
+ if (ipv6_addr_equal(&aca->aca_addr, addr)) {
+ aca->aca_users++;
+ err = 0;
+ goto out;
+ }
+ }
+
+ net = dev_net(idev->dev);
+ f6i = addrconf_f6i_alloc(net, idev, addr, true, GFP_ATOMIC);
+ if (IS_ERR(f6i)) {
+ err = PTR_ERR(f6i);
+ goto out;
+ }
+ aca = aca_alloc(f6i, addr);
+ if (!aca) {
+ fib6_info_release(f6i);
+ err = -ENOMEM;
+ goto out;
+ }
+
+ aca->aca_next = idev->ac_list;
+ idev->ac_list = aca;
+
+ /* Hold this for addrconf_join_solict() below before we unlock,
+ * it is already exposed via idev->ac_list.
+ */
+ aca_get(aca);
+ write_unlock_bh(&idev->lock);
+
+ ip6_ins_rt(net, f6i);
+
+ addrconf_join_solict(idev->dev, &aca->aca_addr);
+
+ aca_put(aca);
+ return 0;
+out:
+ write_unlock_bh(&idev->lock);
+ return err;
+}
+
+/*
+ * device anycast group decrement
+ */
+int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr)
+{
+ struct ifacaddr6 *aca, *prev_aca;
+
+ ASSERT_RTNL();
+
+ write_lock_bh(&idev->lock);
+ prev_aca = NULL;
+ for (aca = idev->ac_list; aca; aca = aca->aca_next) {
+ if (ipv6_addr_equal(&aca->aca_addr, addr))
+ break;
+ prev_aca = aca;
+ }
+ if (!aca) {
+ write_unlock_bh(&idev->lock);
+ return -ENOENT;
+ }
+ if (--aca->aca_users > 0) {
+ write_unlock_bh(&idev->lock);
+ return 0;
+ }
+ if (prev_aca)
+ prev_aca->aca_next = aca->aca_next;
+ else
+ idev->ac_list = aca->aca_next;
+ write_unlock_bh(&idev->lock);
+ addrconf_leave_solict(idev, &aca->aca_addr);
+
+ ip6_del_rt(dev_net(idev->dev), aca->aca_rt);
+
+ aca_put(aca);
+ return 0;
+}
+
+/* called with rtnl_lock() */
+static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr)
+{
+ struct inet6_dev *idev = __in6_dev_get(dev);
+
+ if (!idev)
+ return -ENODEV;
+ return __ipv6_dev_ac_dec(idev, addr);
+}
+
+void ipv6_ac_destroy_dev(struct inet6_dev *idev)
+{
+ struct ifacaddr6 *aca;
+
+ write_lock_bh(&idev->lock);
+ while ((aca = idev->ac_list) != NULL) {
+ idev->ac_list = aca->aca_next;
+ write_unlock_bh(&idev->lock);
+
+ addrconf_leave_solict(idev, &aca->aca_addr);
+
+ ip6_del_rt(dev_net(idev->dev), aca->aca_rt);
+
+ aca_put(aca);
+
+ write_lock_bh(&idev->lock);
+ }
+ write_unlock_bh(&idev->lock);
+}
+
+/*
+ * check if the interface has this anycast address
+ * called with rcu_read_lock()
+ */
+static bool ipv6_chk_acast_dev(struct net_device *dev, const struct in6_addr *addr)
+{
+ struct inet6_dev *idev;
+ struct ifacaddr6 *aca;
+
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ read_lock_bh(&idev->lock);
+ for (aca = idev->ac_list; aca; aca = aca->aca_next)
+ if (ipv6_addr_equal(&aca->aca_addr, addr))
+ break;
+ read_unlock_bh(&idev->lock);
+ return aca != NULL;
+ }
+ return false;
+}
+
+/*
+ * check if given interface (or any, if dev==0) has this anycast address
+ */
+bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
+ const struct in6_addr *addr)
+{
+ bool found = false;
+
+ rcu_read_lock();
+ if (dev)
+ found = ipv6_chk_acast_dev(dev, addr);
+ else
+ for_each_netdev_rcu(net, dev)
+ if (ipv6_chk_acast_dev(dev, addr)) {
+ found = true;
+ break;
+ }
+ rcu_read_unlock();
+ return found;
+}
+
+/* check if this anycast address is link-local on given interface or
+ * is global
+ */
+bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
+ const struct in6_addr *addr)
+{
+ return ipv6_chk_acast_addr(net,
+ (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL ?
+ dev : NULL),
+ addr);
+}
+
+#ifdef CONFIG_PROC_FS
+struct ac6_iter_state {
+ struct seq_net_private p;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+};
+
+#define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private)
+
+static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq)
+{
+ struct ifacaddr6 *im = NULL;
+ struct ac6_iter_state *state = ac6_seq_private(seq);
+ struct net *net = seq_file_net(seq);
+
+ state->idev = NULL;
+ for_each_netdev_rcu(net, state->dev) {
+ struct inet6_dev *idev;
+ idev = __in6_dev_get(state->dev);
+ if (!idev)
+ continue;
+ read_lock_bh(&idev->lock);
+ im = idev->ac_list;
+ if (im) {
+ state->idev = idev;
+ break;
+ }
+ read_unlock_bh(&idev->lock);
+ }
+ return im;
+}
+
+static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im)
+{
+ struct ac6_iter_state *state = ac6_seq_private(seq);
+
+ im = im->aca_next;
+ while (!im) {
+ if (likely(state->idev != NULL))
+ read_unlock_bh(&state->idev->lock);
+
+ state->dev = next_net_device_rcu(state->dev);
+ if (!state->dev) {
+ state->idev = NULL;
+ break;
+ }
+ state->idev = __in6_dev_get(state->dev);
+ if (!state->idev)
+ continue;
+ read_lock_bh(&state->idev->lock);
+ im = state->idev->ac_list;
+ }
+ return im;
+}
+
+static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos)
+{
+ struct ifacaddr6 *im = ac6_get_first(seq);
+ if (im)
+ while (pos && (im = ac6_get_next(seq, im)) != NULL)
+ --pos;
+ return pos ? NULL : im;
+}
+
+static void *ac6_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(RCU)
+{
+ rcu_read_lock();
+ return ac6_get_idx(seq, *pos);
+}
+
+static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct ifacaddr6 *im = ac6_get_next(seq, v);
+
+ ++*pos;
+ return im;
+}
+
+static void ac6_seq_stop(struct seq_file *seq, void *v)
+ __releases(RCU)
+{
+ struct ac6_iter_state *state = ac6_seq_private(seq);
+
+ if (likely(state->idev != NULL)) {
+ read_unlock_bh(&state->idev->lock);
+ state->idev = NULL;
+ }
+ rcu_read_unlock();
+}
+
+static int ac6_seq_show(struct seq_file *seq, void *v)
+{
+ struct ifacaddr6 *im = (struct ifacaddr6 *)v;
+ struct ac6_iter_state *state = ac6_seq_private(seq);
+
+ seq_printf(seq, "%-4d %-15s %pi6 %5d\n",
+ state->dev->ifindex, state->dev->name,
+ &im->aca_addr, im->aca_users);
+ return 0;
+}
+
+static const struct seq_operations ac6_seq_ops = {
+ .start = ac6_seq_start,
+ .next = ac6_seq_next,
+ .stop = ac6_seq_stop,
+ .show = ac6_seq_show,
+};
+
+int __net_init ac6_proc_init(struct net *net)
+{
+ if (!proc_create_net("anycast6", 0444, net->proc_net, &ac6_seq_ops,
+ sizeof(struct ac6_iter_state)))
+ return -ENOMEM;
+
+ return 0;
+}
+
+void ac6_proc_exit(struct net *net)
+{
+ remove_proc_entry("anycast6", net->proc_net);
+}
+#endif
diff --git a/net/ipv6/calipso.c b/net/ipv6/calipso.c
new file mode 100644
index 0000000..1c0bb9f
--- /dev/null
+++ b/net/ipv6/calipso.c
@@ -0,0 +1,1476 @@
+/*
+ * CALIPSO - Common Architecture Label IPv6 Security Option
+ *
+ * This is an implementation of the CALIPSO protocol as specified in
+ * RFC 5570.
+ *
+ * Authors: Paul Moore <paul.moore@hp.com>
+ * Huw Davies <huw@codeweavers.com>
+ *
+ */
+
+/* (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
+ * (c) Copyright Huw Davies <huw@codeweavers.com>, 2015
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/jhash.h>
+#include <linux/audit.h>
+#include <linux/slab.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/tcp.h>
+#include <net/netlabel.h>
+#include <net/calipso.h>
+#include <linux/atomic.h>
+#include <linux/bug.h>
+#include <asm/unaligned.h>
+#include <linux/crc-ccitt.h>
+
+/* Maximium size of the calipso option including
+ * the two-byte TLV header.
+ */
+#define CALIPSO_OPT_LEN_MAX (2 + 252)
+
+/* Size of the minimum calipso option including
+ * the two-byte TLV header.
+ */
+#define CALIPSO_HDR_LEN (2 + 8)
+
+/* Maximium size of the calipso option including
+ * the two-byte TLV header and upto 3 bytes of
+ * leading pad and 7 bytes of trailing pad.
+ */
+#define CALIPSO_OPT_LEN_MAX_WITH_PAD (3 + CALIPSO_OPT_LEN_MAX + 7)
+
+ /* Maximium size of u32 aligned buffer required to hold calipso
+ * option. Max of 3 initial pad bytes starting from buffer + 3.
+ * i.e. the worst case is when the previous tlv finishes on 4n + 3.
+ */
+#define CALIPSO_MAX_BUFFER (6 + CALIPSO_OPT_LEN_MAX)
+
+/* List of available DOI definitions */
+static DEFINE_SPINLOCK(calipso_doi_list_lock);
+static LIST_HEAD(calipso_doi_list);
+
+/* Label mapping cache */
+int calipso_cache_enabled = 1;
+int calipso_cache_bucketsize = 10;
+#define CALIPSO_CACHE_BUCKETBITS 7
+#define CALIPSO_CACHE_BUCKETS BIT(CALIPSO_CACHE_BUCKETBITS)
+#define CALIPSO_CACHE_REORDERLIMIT 10
+struct calipso_map_cache_bkt {
+ spinlock_t lock;
+ u32 size;
+ struct list_head list;
+};
+
+struct calipso_map_cache_entry {
+ u32 hash;
+ unsigned char *key;
+ size_t key_len;
+
+ struct netlbl_lsm_cache *lsm_data;
+
+ u32 activity;
+ struct list_head list;
+};
+
+static struct calipso_map_cache_bkt *calipso_cache;
+
+/* Label Mapping Cache Functions
+ */
+
+/**
+ * calipso_cache_entry_free - Frees a cache entry
+ * @entry: the entry to free
+ *
+ * Description:
+ * This function frees the memory associated with a cache entry including the
+ * LSM cache data if there are no longer any users, i.e. reference count == 0.
+ *
+ */
+static void calipso_cache_entry_free(struct calipso_map_cache_entry *entry)
+{
+ if (entry->lsm_data)
+ netlbl_secattr_cache_free(entry->lsm_data);
+ kfree(entry->key);
+ kfree(entry);
+}
+
+/**
+ * calipso_map_cache_hash - Hashing function for the CALIPSO cache
+ * @key: the hash key
+ * @key_len: the length of the key in bytes
+ *
+ * Description:
+ * The CALIPSO tag hashing function. Returns a 32-bit hash value.
+ *
+ */
+static u32 calipso_map_cache_hash(const unsigned char *key, u32 key_len)
+{
+ return jhash(key, key_len, 0);
+}
+
+/**
+ * calipso_cache_init - Initialize the CALIPSO cache
+ *
+ * Description:
+ * Initializes the CALIPSO label mapping cache, this function should be called
+ * before any of the other functions defined in this file. Returns zero on
+ * success, negative values on error.
+ *
+ */
+static int __init calipso_cache_init(void)
+{
+ u32 iter;
+
+ calipso_cache = kcalloc(CALIPSO_CACHE_BUCKETS,
+ sizeof(struct calipso_map_cache_bkt),
+ GFP_KERNEL);
+ if (!calipso_cache)
+ return -ENOMEM;
+
+ for (iter = 0; iter < CALIPSO_CACHE_BUCKETS; iter++) {
+ spin_lock_init(&calipso_cache[iter].lock);
+ calipso_cache[iter].size = 0;
+ INIT_LIST_HEAD(&calipso_cache[iter].list);
+ }
+
+ return 0;
+}
+
+/**
+ * calipso_cache_invalidate - Invalidates the current CALIPSO cache
+ *
+ * Description:
+ * Invalidates and frees any entries in the CALIPSO cache. Returns zero on
+ * success and negative values on failure.
+ *
+ */
+static void calipso_cache_invalidate(void)
+{
+ struct calipso_map_cache_entry *entry, *tmp_entry;
+ u32 iter;
+
+ for (iter = 0; iter < CALIPSO_CACHE_BUCKETS; iter++) {
+ spin_lock_bh(&calipso_cache[iter].lock);
+ list_for_each_entry_safe(entry,
+ tmp_entry,
+ &calipso_cache[iter].list, list) {
+ list_del(&entry->list);
+ calipso_cache_entry_free(entry);
+ }
+ calipso_cache[iter].size = 0;
+ spin_unlock_bh(&calipso_cache[iter].lock);
+ }
+}
+
+/**
+ * calipso_cache_check - Check the CALIPSO cache for a label mapping
+ * @key: the buffer to check
+ * @key_len: buffer length in bytes
+ * @secattr: the security attribute struct to use
+ *
+ * Description:
+ * This function checks the cache to see if a label mapping already exists for
+ * the given key. If there is a match then the cache is adjusted and the
+ * @secattr struct is populated with the correct LSM security attributes. The
+ * cache is adjusted in the following manner if the entry is not already the
+ * first in the cache bucket:
+ *
+ * 1. The cache entry's activity counter is incremented
+ * 2. The previous (higher ranking) entry's activity counter is decremented
+ * 3. If the difference between the two activity counters is geater than
+ * CALIPSO_CACHE_REORDERLIMIT the two entries are swapped
+ *
+ * Returns zero on success, -ENOENT for a cache miss, and other negative values
+ * on error.
+ *
+ */
+static int calipso_cache_check(const unsigned char *key,
+ u32 key_len,
+ struct netlbl_lsm_secattr *secattr)
+{
+ u32 bkt;
+ struct calipso_map_cache_entry *entry;
+ struct calipso_map_cache_entry *prev_entry = NULL;
+ u32 hash;
+
+ if (!calipso_cache_enabled)
+ return -ENOENT;
+
+ hash = calipso_map_cache_hash(key, key_len);
+ bkt = hash & (CALIPSO_CACHE_BUCKETS - 1);
+ spin_lock_bh(&calipso_cache[bkt].lock);
+ list_for_each_entry(entry, &calipso_cache[bkt].list, list) {
+ if (entry->hash == hash &&
+ entry->key_len == key_len &&
+ memcmp(entry->key, key, key_len) == 0) {
+ entry->activity += 1;
+ refcount_inc(&entry->lsm_data->refcount);
+ secattr->cache = entry->lsm_data;
+ secattr->flags |= NETLBL_SECATTR_CACHE;
+ secattr->type = NETLBL_NLTYPE_CALIPSO;
+ if (!prev_entry) {
+ spin_unlock_bh(&calipso_cache[bkt].lock);
+ return 0;
+ }
+
+ if (prev_entry->activity > 0)
+ prev_entry->activity -= 1;
+ if (entry->activity > prev_entry->activity &&
+ entry->activity - prev_entry->activity >
+ CALIPSO_CACHE_REORDERLIMIT) {
+ __list_del(entry->list.prev, entry->list.next);
+ __list_add(&entry->list,
+ prev_entry->list.prev,
+ &prev_entry->list);
+ }
+
+ spin_unlock_bh(&calipso_cache[bkt].lock);
+ return 0;
+ }
+ prev_entry = entry;
+ }
+ spin_unlock_bh(&calipso_cache[bkt].lock);
+
+ return -ENOENT;
+}
+
+/**
+ * calipso_cache_add - Add an entry to the CALIPSO cache
+ * @calipso_ptr: the CALIPSO option
+ * @secattr: the packet's security attributes
+ *
+ * Description:
+ * Add a new entry into the CALIPSO label mapping cache. Add the new entry to
+ * head of the cache bucket's list, if the cache bucket is out of room remove
+ * the last entry in the list first. It is important to note that there is
+ * currently no checking for duplicate keys. Returns zero on success,
+ * negative values on failure. The key stored starts at calipso_ptr + 2,
+ * i.e. the type and length bytes are not stored, this corresponds to
+ * calipso_ptr[1] bytes of data.
+ *
+ */
+static int calipso_cache_add(const unsigned char *calipso_ptr,
+ const struct netlbl_lsm_secattr *secattr)
+{
+ int ret_val = -EPERM;
+ u32 bkt;
+ struct calipso_map_cache_entry *entry = NULL;
+ struct calipso_map_cache_entry *old_entry = NULL;
+ u32 calipso_ptr_len;
+
+ if (!calipso_cache_enabled || calipso_cache_bucketsize <= 0)
+ return 0;
+
+ calipso_ptr_len = calipso_ptr[1];
+
+ entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+ if (!entry)
+ return -ENOMEM;
+ entry->key = kmemdup(calipso_ptr + 2, calipso_ptr_len, GFP_ATOMIC);
+ if (!entry->key) {
+ ret_val = -ENOMEM;
+ goto cache_add_failure;
+ }
+ entry->key_len = calipso_ptr_len;
+ entry->hash = calipso_map_cache_hash(calipso_ptr, calipso_ptr_len);
+ refcount_inc(&secattr->cache->refcount);
+ entry->lsm_data = secattr->cache;
+
+ bkt = entry->hash & (CALIPSO_CACHE_BUCKETS - 1);
+ spin_lock_bh(&calipso_cache[bkt].lock);
+ if (calipso_cache[bkt].size < calipso_cache_bucketsize) {
+ list_add(&entry->list, &calipso_cache[bkt].list);
+ calipso_cache[bkt].size += 1;
+ } else {
+ old_entry = list_entry(calipso_cache[bkt].list.prev,
+ struct calipso_map_cache_entry, list);
+ list_del(&old_entry->list);
+ list_add(&entry->list, &calipso_cache[bkt].list);
+ calipso_cache_entry_free(old_entry);
+ }
+ spin_unlock_bh(&calipso_cache[bkt].lock);
+
+ return 0;
+
+cache_add_failure:
+ if (entry)
+ calipso_cache_entry_free(entry);
+ return ret_val;
+}
+
+/* DOI List Functions
+ */
+
+/**
+ * calipso_doi_search - Searches for a DOI definition
+ * @doi: the DOI to search for
+ *
+ * Description:
+ * Search the DOI definition list for a DOI definition with a DOI value that
+ * matches @doi. The caller is responsible for calling rcu_read_[un]lock().
+ * Returns a pointer to the DOI definition on success and NULL on failure.
+ */
+static struct calipso_doi *calipso_doi_search(u32 doi)
+{
+ struct calipso_doi *iter;
+
+ list_for_each_entry_rcu(iter, &calipso_doi_list, list)
+ if (iter->doi == doi && refcount_read(&iter->refcount))
+ return iter;
+ return NULL;
+}
+
+/**
+ * calipso_doi_add - Add a new DOI to the CALIPSO protocol engine
+ * @doi_def: the DOI structure
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * The caller defines a new DOI for use by the CALIPSO engine and calls this
+ * function to add it to the list of acceptable domains. The caller must
+ * ensure that the mapping table specified in @doi_def->map meets all of the
+ * requirements of the mapping type (see calipso.h for details). Returns
+ * zero on success and non-zero on failure.
+ *
+ */
+static int calipso_doi_add(struct calipso_doi *doi_def,
+ struct netlbl_audit *audit_info)
+{
+ int ret_val = -EINVAL;
+ u32 doi;
+ u32 doi_type;
+ struct audit_buffer *audit_buf;
+
+ doi = doi_def->doi;
+ doi_type = doi_def->type;
+
+ if (doi_def->doi == CALIPSO_DOI_UNKNOWN)
+ goto doi_add_return;
+
+ refcount_set(&doi_def->refcount, 1);
+
+ spin_lock(&calipso_doi_list_lock);
+ if (calipso_doi_search(doi_def->doi)) {
+ spin_unlock(&calipso_doi_list_lock);
+ ret_val = -EEXIST;
+ goto doi_add_return;
+ }
+ list_add_tail_rcu(&doi_def->list, &calipso_doi_list);
+ spin_unlock(&calipso_doi_list_lock);
+ ret_val = 0;
+
+doi_add_return:
+ audit_buf = netlbl_audit_start(AUDIT_MAC_CALIPSO_ADD, audit_info);
+ if (audit_buf) {
+ const char *type_str;
+
+ switch (doi_type) {
+ case CALIPSO_MAP_PASS:
+ type_str = "pass";
+ break;
+ default:
+ type_str = "(unknown)";
+ }
+ audit_log_format(audit_buf,
+ " calipso_doi=%u calipso_type=%s res=%u",
+ doi, type_str, ret_val == 0 ? 1 : 0);
+ audit_log_end(audit_buf);
+ }
+
+ return ret_val;
+}
+
+/**
+ * calipso_doi_free - Frees a DOI definition
+ * @doi_def: the DOI definition
+ *
+ * Description:
+ * This function frees all of the memory associated with a DOI definition.
+ *
+ */
+static void calipso_doi_free(struct calipso_doi *doi_def)
+{
+ kfree(doi_def);
+}
+
+/**
+ * calipso_doi_free_rcu - Frees a DOI definition via the RCU pointer
+ * @entry: the entry's RCU field
+ *
+ * Description:
+ * This function is designed to be used as a callback to the call_rcu()
+ * function so that the memory allocated to the DOI definition can be released
+ * safely.
+ *
+ */
+static void calipso_doi_free_rcu(struct rcu_head *entry)
+{
+ struct calipso_doi *doi_def;
+
+ doi_def = container_of(entry, struct calipso_doi, rcu);
+ calipso_doi_free(doi_def);
+}
+
+/**
+ * calipso_doi_remove - Remove an existing DOI from the CALIPSO protocol engine
+ * @doi: the DOI value
+ * @audit_secid: the LSM secid to use in the audit message
+ *
+ * Description:
+ * Removes a DOI definition from the CALIPSO engine. The NetLabel routines will
+ * be called to release their own LSM domain mappings as well as our own
+ * domain list. Returns zero on success and negative values on failure.
+ *
+ */
+static int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info)
+{
+ int ret_val;
+ struct calipso_doi *doi_def;
+ struct audit_buffer *audit_buf;
+
+ spin_lock(&calipso_doi_list_lock);
+ doi_def = calipso_doi_search(doi);
+ if (!doi_def) {
+ spin_unlock(&calipso_doi_list_lock);
+ ret_val = -ENOENT;
+ goto doi_remove_return;
+ }
+ if (!refcount_dec_and_test(&doi_def->refcount)) {
+ spin_unlock(&calipso_doi_list_lock);
+ ret_val = -EBUSY;
+ goto doi_remove_return;
+ }
+ list_del_rcu(&doi_def->list);
+ spin_unlock(&calipso_doi_list_lock);
+
+ call_rcu(&doi_def->rcu, calipso_doi_free_rcu);
+ ret_val = 0;
+
+doi_remove_return:
+ audit_buf = netlbl_audit_start(AUDIT_MAC_CALIPSO_DEL, audit_info);
+ if (audit_buf) {
+ audit_log_format(audit_buf,
+ " calipso_doi=%u res=%u",
+ doi, ret_val == 0 ? 1 : 0);
+ audit_log_end(audit_buf);
+ }
+
+ return ret_val;
+}
+
+/**
+ * calipso_doi_getdef - Returns a reference to a valid DOI definition
+ * @doi: the DOI value
+ *
+ * Description:
+ * Searches for a valid DOI definition and if one is found it is returned to
+ * the caller. Otherwise NULL is returned. The caller must ensure that
+ * calipso_doi_putdef() is called when the caller is done.
+ *
+ */
+static struct calipso_doi *calipso_doi_getdef(u32 doi)
+{
+ struct calipso_doi *doi_def;
+
+ rcu_read_lock();
+ doi_def = calipso_doi_search(doi);
+ if (!doi_def)
+ goto doi_getdef_return;
+ if (!refcount_inc_not_zero(&doi_def->refcount))
+ doi_def = NULL;
+
+doi_getdef_return:
+ rcu_read_unlock();
+ return doi_def;
+}
+
+/**
+ * calipso_doi_putdef - Releases a reference for the given DOI definition
+ * @doi_def: the DOI definition
+ *
+ * Description:
+ * Releases a DOI definition reference obtained from calipso_doi_getdef().
+ *
+ */
+static void calipso_doi_putdef(struct calipso_doi *doi_def)
+{
+ if (!doi_def)
+ return;
+
+ if (!refcount_dec_and_test(&doi_def->refcount))
+ return;
+ spin_lock(&calipso_doi_list_lock);
+ list_del_rcu(&doi_def->list);
+ spin_unlock(&calipso_doi_list_lock);
+
+ call_rcu(&doi_def->rcu, calipso_doi_free_rcu);
+}
+
+/**
+ * calipso_doi_walk - Iterate through the DOI definitions
+ * @skip_cnt: skip past this number of DOI definitions, updated
+ * @callback: callback for each DOI definition
+ * @cb_arg: argument for the callback function
+ *
+ * Description:
+ * Iterate over the DOI definition list, skipping the first @skip_cnt entries.
+ * For each entry call @callback, if @callback returns a negative value stop
+ * 'walking' through the list and return. Updates the value in @skip_cnt upon
+ * return. Returns zero on success, negative values on failure.
+ *
+ */
+static int calipso_doi_walk(u32 *skip_cnt,
+ int (*callback)(struct calipso_doi *doi_def,
+ void *arg),
+ void *cb_arg)
+{
+ int ret_val = -ENOENT;
+ u32 doi_cnt = 0;
+ struct calipso_doi *iter_doi;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(iter_doi, &calipso_doi_list, list)
+ if (refcount_read(&iter_doi->refcount) > 0) {
+ if (doi_cnt++ < *skip_cnt)
+ continue;
+ ret_val = callback(iter_doi, cb_arg);
+ if (ret_val < 0) {
+ doi_cnt--;
+ goto doi_walk_return;
+ }
+ }
+
+doi_walk_return:
+ rcu_read_unlock();
+ *skip_cnt = doi_cnt;
+ return ret_val;
+}
+
+/**
+ * calipso_validate - Validate a CALIPSO option
+ * @skb: the packet
+ * @option: the start of the option
+ *
+ * Description:
+ * This routine is called to validate a CALIPSO option.
+ * If the option is valid then %true is returned, otherwise
+ * %false is returned.
+ *
+ * The caller should have already checked that the length of the
+ * option (including the TLV header) is >= 10 and that the catmap
+ * length is consistent with the option length.
+ *
+ * We leave checks on the level and categories to the socket layer.
+ */
+bool calipso_validate(const struct sk_buff *skb, const unsigned char *option)
+{
+ struct calipso_doi *doi_def;
+ bool ret_val;
+ u16 crc, len = option[1] + 2;
+ static const u8 zero[2];
+
+ /* The original CRC runs over the option including the TLV header
+ * with the CRC-16 field (at offset 8) zeroed out. */
+ crc = crc_ccitt(0xffff, option, 8);
+ crc = crc_ccitt(crc, zero, sizeof(zero));
+ if (len > 10)
+ crc = crc_ccitt(crc, option + 10, len - 10);
+ crc = ~crc;
+ if (option[8] != (crc & 0xff) || option[9] != ((crc >> 8) & 0xff))
+ return false;
+
+ rcu_read_lock();
+ doi_def = calipso_doi_search(get_unaligned_be32(option + 2));
+ ret_val = !!doi_def;
+ rcu_read_unlock();
+
+ return ret_val;
+}
+
+/**
+ * calipso_map_cat_hton - Perform a category mapping from host to network
+ * @doi_def: the DOI definition
+ * @secattr: the security attributes
+ * @net_cat: the zero'd out category bitmap in network/CALIPSO format
+ * @net_cat_len: the length of the CALIPSO bitmap in bytes
+ *
+ * Description:
+ * Perform a label mapping to translate a local MLS category bitmap to the
+ * correct CALIPSO bitmap using the given DOI definition. Returns the minimum
+ * size in bytes of the network bitmap on success, negative values otherwise.
+ *
+ */
+static int calipso_map_cat_hton(const struct calipso_doi *doi_def,
+ const struct netlbl_lsm_secattr *secattr,
+ unsigned char *net_cat,
+ u32 net_cat_len)
+{
+ int spot = -1;
+ u32 net_spot_max = 0;
+ u32 net_clen_bits = net_cat_len * 8;
+
+ for (;;) {
+ spot = netlbl_catmap_walk(secattr->attr.mls.cat,
+ spot + 1);
+ if (spot < 0)
+ break;
+ if (spot >= net_clen_bits)
+ return -ENOSPC;
+ netlbl_bitmap_setbit(net_cat, spot, 1);
+
+ if (spot > net_spot_max)
+ net_spot_max = spot;
+ }
+
+ return (net_spot_max / 32 + 1) * 4;
+}
+
+/**
+ * calipso_map_cat_ntoh - Perform a category mapping from network to host
+ * @doi_def: the DOI definition
+ * @net_cat: the category bitmap in network/CALIPSO format
+ * @net_cat_len: the length of the CALIPSO bitmap in bytes
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Perform a label mapping to translate a CALIPSO bitmap to the correct local
+ * MLS category bitmap using the given DOI definition. Returns zero on
+ * success, negative values on failure.
+ *
+ */
+static int calipso_map_cat_ntoh(const struct calipso_doi *doi_def,
+ const unsigned char *net_cat,
+ u32 net_cat_len,
+ struct netlbl_lsm_secattr *secattr)
+{
+ int ret_val;
+ int spot = -1;
+ u32 net_clen_bits = net_cat_len * 8;
+
+ for (;;) {
+ spot = netlbl_bitmap_walk(net_cat,
+ net_clen_bits,
+ spot + 1,
+ 1);
+ if (spot < 0) {
+ if (spot == -2)
+ return -EFAULT;
+ return 0;
+ }
+
+ ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat,
+ spot,
+ GFP_ATOMIC);
+ if (ret_val != 0)
+ return ret_val;
+ }
+
+ return -EINVAL;
+}
+
+/**
+ * calipso_pad_write - Writes pad bytes in TLV format
+ * @buf: the buffer
+ * @offset: offset from start of buffer to write padding
+ * @count: number of pad bytes to write
+ *
+ * Description:
+ * Write @count bytes of TLV padding into @buffer starting at offset @offset.
+ * @count should be less than 8 - see RFC 4942.
+ *
+ */
+static int calipso_pad_write(unsigned char *buf, unsigned int offset,
+ unsigned int count)
+{
+ if (WARN_ON_ONCE(count >= 8))
+ return -EINVAL;
+
+ switch (count) {
+ case 0:
+ break;
+ case 1:
+ buf[offset] = IPV6_TLV_PAD1;
+ break;
+ default:
+ buf[offset] = IPV6_TLV_PADN;
+ buf[offset + 1] = count - 2;
+ if (count > 2)
+ memset(buf + offset + 2, 0, count - 2);
+ break;
+ }
+ return 0;
+}
+
+/**
+ * calipso_genopt - Generate a CALIPSO option
+ * @buf: the option buffer
+ * @start: offset from which to write
+ * @buf_len: the size of opt_buf
+ * @doi_def: the CALIPSO DOI to use
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Generate a CALIPSO option using the DOI definition and security attributes
+ * passed to the function. This also generates upto three bytes of leading
+ * padding that ensures that the option is 4n + 2 aligned. It returns the
+ * number of bytes written (including any initial padding).
+ */
+static int calipso_genopt(unsigned char *buf, u32 start, u32 buf_len,
+ const struct calipso_doi *doi_def,
+ const struct netlbl_lsm_secattr *secattr)
+{
+ int ret_val;
+ u32 len, pad;
+ u16 crc;
+ static const unsigned char padding[4] = {2, 1, 0, 3};
+ unsigned char *calipso;
+
+ /* CALIPSO has 4n + 2 alignment */
+ pad = padding[start & 3];
+ if (buf_len <= start + pad + CALIPSO_HDR_LEN)
+ return -ENOSPC;
+
+ if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0)
+ return -EPERM;
+
+ len = CALIPSO_HDR_LEN;
+
+ if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
+ ret_val = calipso_map_cat_hton(doi_def,
+ secattr,
+ buf + start + pad + len,
+ buf_len - start - pad - len);
+ if (ret_val < 0)
+ return ret_val;
+ len += ret_val;
+ }
+
+ calipso_pad_write(buf, start, pad);
+ calipso = buf + start + pad;
+
+ calipso[0] = IPV6_TLV_CALIPSO;
+ calipso[1] = len - 2;
+ *(__be32 *)(calipso + 2) = htonl(doi_def->doi);
+ calipso[6] = (len - CALIPSO_HDR_LEN) / 4;
+ calipso[7] = secattr->attr.mls.lvl,
+ crc = ~crc_ccitt(0xffff, calipso, len);
+ calipso[8] = crc & 0xff;
+ calipso[9] = (crc >> 8) & 0xff;
+ return pad + len;
+}
+
+/* Hop-by-hop hdr helper functions
+ */
+
+/**
+ * calipso_opt_update - Replaces socket's hop options with a new set
+ * @sk: the socket
+ * @hop: new hop options
+ *
+ * Description:
+ * Replaces @sk's hop options with @hop. @hop may be NULL to leave
+ * the socket with no hop options.
+ *
+ */
+static int calipso_opt_update(struct sock *sk, struct ipv6_opt_hdr *hop)
+{
+ struct ipv6_txoptions *old = txopt_get(inet6_sk(sk)), *txopts;
+
+ txopts = ipv6_renew_options(sk, old, IPV6_HOPOPTS, hop);
+ txopt_put(old);
+ if (IS_ERR(txopts))
+ return PTR_ERR(txopts);
+
+ txopts = ipv6_update_options(sk, txopts);
+ if (txopts) {
+ atomic_sub(txopts->tot_len, &sk->sk_omem_alloc);
+ txopt_put(txopts);
+ }
+
+ return 0;
+}
+
+/**
+ * calipso_tlv_len - Returns the length of the TLV
+ * @opt: the option header
+ * @offset: offset of the TLV within the header
+ *
+ * Description:
+ * Returns the length of the TLV option at offset @offset within
+ * the option header @opt. Checks that the entire TLV fits inside
+ * the option header, returns a negative value if this is not the case.
+ */
+static int calipso_tlv_len(struct ipv6_opt_hdr *opt, unsigned int offset)
+{
+ unsigned char *tlv = (unsigned char *)opt;
+ unsigned int opt_len = ipv6_optlen(opt), tlv_len;
+
+ if (offset < sizeof(*opt) || offset >= opt_len)
+ return -EINVAL;
+ if (tlv[offset] == IPV6_TLV_PAD1)
+ return 1;
+ if (offset + 1 >= opt_len)
+ return -EINVAL;
+ tlv_len = tlv[offset + 1] + 2;
+ if (offset + tlv_len > opt_len)
+ return -EINVAL;
+ return tlv_len;
+}
+
+/**
+ * calipso_opt_find - Finds the CALIPSO option in an IPv6 hop options header
+ * @hop: the hop options header
+ * @start: on return holds the offset of any leading padding
+ * @end: on return holds the offset of the first non-pad TLV after CALIPSO
+ *
+ * Description:
+ * Finds the space occupied by a CALIPSO option (including any leading and
+ * trailing padding).
+ *
+ * If a CALIPSO option exists set @start and @end to the
+ * offsets within @hop of the start of padding before the first
+ * CALIPSO option and the end of padding after the first CALIPSO
+ * option. In this case the function returns 0.
+ *
+ * In the absence of a CALIPSO option, @start and @end will be
+ * set to the start and end of any trailing padding in the header.
+ * This is useful when appending a new option, as the caller may want
+ * to overwrite some of this padding. In this case the function will
+ * return -ENOENT.
+ */
+static int calipso_opt_find(struct ipv6_opt_hdr *hop, unsigned int *start,
+ unsigned int *end)
+{
+ int ret_val = -ENOENT, tlv_len;
+ unsigned int opt_len, offset, offset_s = 0, offset_e = 0;
+ unsigned char *opt = (unsigned char *)hop;
+
+ opt_len = ipv6_optlen(hop);
+ offset = sizeof(*hop);
+
+ while (offset < opt_len) {
+ tlv_len = calipso_tlv_len(hop, offset);
+ if (tlv_len < 0)
+ return tlv_len;
+
+ switch (opt[offset]) {
+ case IPV6_TLV_PAD1:
+ case IPV6_TLV_PADN:
+ if (offset_e)
+ offset_e = offset;
+ break;
+ case IPV6_TLV_CALIPSO:
+ ret_val = 0;
+ offset_e = offset;
+ break;
+ default:
+ if (offset_e == 0)
+ offset_s = offset;
+ else
+ goto out;
+ }
+ offset += tlv_len;
+ }
+
+out:
+ if (offset_s)
+ *start = offset_s + calipso_tlv_len(hop, offset_s);
+ else
+ *start = sizeof(*hop);
+ if (offset_e)
+ *end = offset_e + calipso_tlv_len(hop, offset_e);
+ else
+ *end = opt_len;
+
+ return ret_val;
+}
+
+/**
+ * calipso_opt_insert - Inserts a CALIPSO option into an IPv6 hop opt hdr
+ * @hop: the original hop options header
+ * @doi_def: the CALIPSO DOI to use
+ * @secattr: the specific security attributes of the socket
+ *
+ * Description:
+ * Creates a new hop options header based on @hop with a
+ * CALIPSO option added to it. If @hop already contains a CALIPSO
+ * option this is overwritten, otherwise the new option is appended
+ * after any existing options. If @hop is NULL then the new header
+ * will contain just the CALIPSO option and any needed padding.
+ *
+ */
+static struct ipv6_opt_hdr *
+calipso_opt_insert(struct ipv6_opt_hdr *hop,
+ const struct calipso_doi *doi_def,
+ const struct netlbl_lsm_secattr *secattr)
+{
+ unsigned int start, end, buf_len, pad, hop_len;
+ struct ipv6_opt_hdr *new;
+ int ret_val;
+
+ if (hop) {
+ hop_len = ipv6_optlen(hop);
+ ret_val = calipso_opt_find(hop, &start, &end);
+ if (ret_val && ret_val != -ENOENT)
+ return ERR_PTR(ret_val);
+ } else {
+ hop_len = 0;
+ start = sizeof(*hop);
+ end = 0;
+ }
+
+ buf_len = hop_len + start - end + CALIPSO_OPT_LEN_MAX_WITH_PAD;
+ new = kzalloc(buf_len, GFP_ATOMIC);
+ if (!new)
+ return ERR_PTR(-ENOMEM);
+
+ if (start > sizeof(*hop))
+ memcpy(new, hop, start);
+ ret_val = calipso_genopt((unsigned char *)new, start, buf_len, doi_def,
+ secattr);
+ if (ret_val < 0) {
+ kfree(new);
+ return ERR_PTR(ret_val);
+ }
+
+ buf_len = start + ret_val;
+ /* At this point buf_len aligns to 4n, so (buf_len & 4) pads to 8n */
+ pad = ((buf_len & 4) + (end & 7)) & 7;
+ calipso_pad_write((unsigned char *)new, buf_len, pad);
+ buf_len += pad;
+
+ if (end != hop_len) {
+ memcpy((char *)new + buf_len, (char *)hop + end, hop_len - end);
+ buf_len += hop_len - end;
+ }
+ new->nexthdr = 0;
+ new->hdrlen = buf_len / 8 - 1;
+
+ return new;
+}
+
+/**
+ * calipso_opt_del - Removes the CALIPSO option from an option header
+ * @hop: the original header
+ * @new: the new header
+ *
+ * Description:
+ * Creates a new header based on @hop without any CALIPSO option. If @hop
+ * doesn't contain a CALIPSO option it returns -ENOENT. If @hop contains
+ * no other non-padding options, it returns zero with @new set to NULL.
+ * Otherwise it returns zero, creates a new header without the CALIPSO
+ * option (and removing as much padding as possible) and returns with
+ * @new set to that header.
+ *
+ */
+static int calipso_opt_del(struct ipv6_opt_hdr *hop,
+ struct ipv6_opt_hdr **new)
+{
+ int ret_val;
+ unsigned int start, end, delta, pad, hop_len;
+
+ ret_val = calipso_opt_find(hop, &start, &end);
+ if (ret_val)
+ return ret_val;
+
+ hop_len = ipv6_optlen(hop);
+ if (start == sizeof(*hop) && end == hop_len) {
+ /* There's no other option in the header so return NULL */
+ *new = NULL;
+ return 0;
+ }
+
+ delta = (end - start) & ~7;
+ *new = kzalloc(hop_len - delta, GFP_ATOMIC);
+ if (!*new)
+ return -ENOMEM;
+
+ memcpy(*new, hop, start);
+ (*new)->hdrlen -= delta / 8;
+ pad = (end - start) & 7;
+ calipso_pad_write((unsigned char *)*new, start, pad);
+ if (end != hop_len)
+ memcpy((char *)*new + start + pad, (char *)hop + end,
+ hop_len - end);
+
+ return 0;
+}
+
+/**
+ * calipso_opt_getattr - Get the security attributes from a memory block
+ * @calipso: the CALIPSO option
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Inspect @calipso and return the security attributes in @secattr.
+ * Returns zero on success and negative values on failure.
+ *
+ */
+static int calipso_opt_getattr(const unsigned char *calipso,
+ struct netlbl_lsm_secattr *secattr)
+{
+ int ret_val = -ENOMSG;
+ u32 doi, len = calipso[1], cat_len = calipso[6] * 4;
+ struct calipso_doi *doi_def;
+
+ if (cat_len + 8 > len)
+ return -EINVAL;
+
+ if (calipso_cache_check(calipso + 2, calipso[1], secattr) == 0)
+ return 0;
+
+ doi = get_unaligned_be32(calipso + 2);
+ rcu_read_lock();
+ doi_def = calipso_doi_search(doi);
+ if (!doi_def)
+ goto getattr_return;
+
+ secattr->attr.mls.lvl = calipso[7];
+ secattr->flags |= NETLBL_SECATTR_MLS_LVL;
+
+ if (cat_len) {
+ ret_val = calipso_map_cat_ntoh(doi_def,
+ calipso + 10,
+ cat_len,
+ secattr);
+ if (ret_val != 0) {
+ netlbl_catmap_free(secattr->attr.mls.cat);
+ goto getattr_return;
+ }
+
+ secattr->flags |= NETLBL_SECATTR_MLS_CAT;
+ }
+
+ secattr->type = NETLBL_NLTYPE_CALIPSO;
+
+getattr_return:
+ rcu_read_unlock();
+ return ret_val;
+}
+
+/* sock functions.
+ */
+
+/**
+ * calipso_sock_getattr - Get the security attributes from a sock
+ * @sk: the sock
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Query @sk to see if there is a CALIPSO option attached to the sock and if
+ * there is return the CALIPSO security attributes in @secattr. This function
+ * requires that @sk be locked, or privately held, but it does not do any
+ * locking itself. Returns zero on success and negative values on failure.
+ *
+ */
+static int calipso_sock_getattr(struct sock *sk,
+ struct netlbl_lsm_secattr *secattr)
+{
+ struct ipv6_opt_hdr *hop;
+ int opt_len, len, ret_val = -ENOMSG, offset;
+ unsigned char *opt;
+ struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk));
+
+ if (!txopts || !txopts->hopopt)
+ goto done;
+
+ hop = txopts->hopopt;
+ opt = (unsigned char *)hop;
+ opt_len = ipv6_optlen(hop);
+ offset = sizeof(*hop);
+ while (offset < opt_len) {
+ len = calipso_tlv_len(hop, offset);
+ if (len < 0) {
+ ret_val = len;
+ goto done;
+ }
+ switch (opt[offset]) {
+ case IPV6_TLV_CALIPSO:
+ if (len < CALIPSO_HDR_LEN)
+ ret_val = -EINVAL;
+ else
+ ret_val = calipso_opt_getattr(&opt[offset],
+ secattr);
+ goto done;
+ default:
+ offset += len;
+ break;
+ }
+ }
+done:
+ txopt_put(txopts);
+ return ret_val;
+}
+
+/**
+ * calipso_sock_setattr - Add a CALIPSO option to a socket
+ * @sk: the socket
+ * @doi_def: the CALIPSO DOI to use
+ * @secattr: the specific security attributes of the socket
+ *
+ * Description:
+ * Set the CALIPSO option on the given socket using the DOI definition and
+ * security attributes passed to the function. This function requires
+ * exclusive access to @sk, which means it either needs to be in the
+ * process of being created or locked. Returns zero on success and negative
+ * values on failure.
+ *
+ */
+static int calipso_sock_setattr(struct sock *sk,
+ const struct calipso_doi *doi_def,
+ const struct netlbl_lsm_secattr *secattr)
+{
+ int ret_val;
+ struct ipv6_opt_hdr *old, *new;
+ struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk));
+
+ old = NULL;
+ if (txopts)
+ old = txopts->hopopt;
+
+ new = calipso_opt_insert(old, doi_def, secattr);
+ txopt_put(txopts);
+ if (IS_ERR(new))
+ return PTR_ERR(new);
+
+ ret_val = calipso_opt_update(sk, new);
+
+ kfree(new);
+ return ret_val;
+}
+
+/**
+ * calipso_sock_delattr - Delete the CALIPSO option from a socket
+ * @sk: the socket
+ *
+ * Description:
+ * Removes the CALIPSO option from a socket, if present.
+ *
+ */
+static void calipso_sock_delattr(struct sock *sk)
+{
+ struct ipv6_opt_hdr *new_hop;
+ struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk));
+
+ if (!txopts || !txopts->hopopt)
+ goto done;
+
+ if (calipso_opt_del(txopts->hopopt, &new_hop))
+ goto done;
+
+ calipso_opt_update(sk, new_hop);
+ kfree(new_hop);
+
+done:
+ txopt_put(txopts);
+}
+
+/* request sock functions.
+ */
+
+/**
+ * calipso_req_setattr - Add a CALIPSO option to a connection request socket
+ * @req: the connection request socket
+ * @doi_def: the CALIPSO DOI to use
+ * @secattr: the specific security attributes of the socket
+ *
+ * Description:
+ * Set the CALIPSO option on the given socket using the DOI definition and
+ * security attributes passed to the function. Returns zero on success and
+ * negative values on failure.
+ *
+ */
+static int calipso_req_setattr(struct request_sock *req,
+ const struct calipso_doi *doi_def,
+ const struct netlbl_lsm_secattr *secattr)
+{
+ struct ipv6_txoptions *txopts;
+ struct inet_request_sock *req_inet = inet_rsk(req);
+ struct ipv6_opt_hdr *old, *new;
+ struct sock *sk = sk_to_full_sk(req_to_sk(req));
+
+ if (req_inet->ipv6_opt && req_inet->ipv6_opt->hopopt)
+ old = req_inet->ipv6_opt->hopopt;
+ else
+ old = NULL;
+
+ new = calipso_opt_insert(old, doi_def, secattr);
+ if (IS_ERR(new))
+ return PTR_ERR(new);
+
+ txopts = ipv6_renew_options(sk, req_inet->ipv6_opt, IPV6_HOPOPTS, new);
+
+ kfree(new);
+
+ if (IS_ERR(txopts))
+ return PTR_ERR(txopts);
+
+ txopts = xchg(&req_inet->ipv6_opt, txopts);
+ if (txopts) {
+ atomic_sub(txopts->tot_len, &sk->sk_omem_alloc);
+ txopt_put(txopts);
+ }
+
+ return 0;
+}
+
+/**
+ * calipso_req_delattr - Delete the CALIPSO option from a request socket
+ * @reg: the request socket
+ *
+ * Description:
+ * Removes the CALIPSO option from a request socket, if present.
+ *
+ */
+static void calipso_req_delattr(struct request_sock *req)
+{
+ struct inet_request_sock *req_inet = inet_rsk(req);
+ struct ipv6_opt_hdr *new;
+ struct ipv6_txoptions *txopts;
+ struct sock *sk = sk_to_full_sk(req_to_sk(req));
+
+ if (!req_inet->ipv6_opt || !req_inet->ipv6_opt->hopopt)
+ return;
+
+ if (calipso_opt_del(req_inet->ipv6_opt->hopopt, &new))
+ return; /* Nothing to do */
+
+ txopts = ipv6_renew_options(sk, req_inet->ipv6_opt, IPV6_HOPOPTS, new);
+
+ if (!IS_ERR(txopts)) {
+ txopts = xchg(&req_inet->ipv6_opt, txopts);
+ if (txopts) {
+ atomic_sub(txopts->tot_len, &sk->sk_omem_alloc);
+ txopt_put(txopts);
+ }
+ }
+ kfree(new);
+}
+
+/* skbuff functions.
+ */
+
+/**
+ * calipso_skbuff_optptr - Find the CALIPSO option in the packet
+ * @skb: the packet
+ *
+ * Description:
+ * Parse the packet's IP header looking for a CALIPSO option. Returns a pointer
+ * to the start of the CALIPSO option on success, NULL if one if not found.
+ *
+ */
+static unsigned char *calipso_skbuff_optptr(const struct sk_buff *skb)
+{
+ const struct ipv6hdr *ip6_hdr = ipv6_hdr(skb);
+ int offset;
+
+ if (ip6_hdr->nexthdr != NEXTHDR_HOP)
+ return NULL;
+
+ offset = ipv6_find_tlv(skb, sizeof(*ip6_hdr), IPV6_TLV_CALIPSO);
+ if (offset >= 0)
+ return (unsigned char *)ip6_hdr + offset;
+
+ return NULL;
+}
+
+/**
+ * calipso_skbuff_setattr - Set the CALIPSO option on a packet
+ * @skb: the packet
+ * @doi_def: the CALIPSO DOI to use
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Set the CALIPSO option on the given packet based on the security attributes.
+ * Returns a pointer to the IP header on success and NULL on failure.
+ *
+ */
+static int calipso_skbuff_setattr(struct sk_buff *skb,
+ const struct calipso_doi *doi_def,
+ const struct netlbl_lsm_secattr *secattr)
+{
+ int ret_val;
+ struct ipv6hdr *ip6_hdr;
+ struct ipv6_opt_hdr *hop;
+ unsigned char buf[CALIPSO_MAX_BUFFER];
+ int len_delta, new_end, pad, payload;
+ unsigned int start, end;
+
+ ip6_hdr = ipv6_hdr(skb);
+ if (ip6_hdr->nexthdr == NEXTHDR_HOP) {
+ hop = (struct ipv6_opt_hdr *)(ip6_hdr + 1);
+ ret_val = calipso_opt_find(hop, &start, &end);
+ if (ret_val && ret_val != -ENOENT)
+ return ret_val;
+ } else {
+ start = 0;
+ end = 0;
+ }
+
+ memset(buf, 0, sizeof(buf));
+ ret_val = calipso_genopt(buf, start & 3, sizeof(buf), doi_def, secattr);
+ if (ret_val < 0)
+ return ret_val;
+
+ new_end = start + ret_val;
+ /* At this point new_end aligns to 4n, so (new_end & 4) pads to 8n */
+ pad = ((new_end & 4) + (end & 7)) & 7;
+ len_delta = new_end - (int)end + pad;
+ ret_val = skb_cow(skb, skb_headroom(skb) + len_delta);
+ if (ret_val < 0)
+ return ret_val;
+
+ ip6_hdr = ipv6_hdr(skb); /* Reset as skb_cow() may have moved it */
+
+ if (len_delta) {
+ if (len_delta > 0)
+ skb_push(skb, len_delta);
+ else
+ skb_pull(skb, -len_delta);
+ memmove((char *)ip6_hdr - len_delta, ip6_hdr,
+ sizeof(*ip6_hdr) + start);
+ skb_reset_network_header(skb);
+ ip6_hdr = ipv6_hdr(skb);
+ payload = ntohs(ip6_hdr->payload_len);
+ ip6_hdr->payload_len = htons(payload + len_delta);
+ }
+
+ hop = (struct ipv6_opt_hdr *)(ip6_hdr + 1);
+ if (start == 0) {
+ struct ipv6_opt_hdr *new_hop = (struct ipv6_opt_hdr *)buf;
+
+ new_hop->nexthdr = ip6_hdr->nexthdr;
+ new_hop->hdrlen = len_delta / 8 - 1;
+ ip6_hdr->nexthdr = NEXTHDR_HOP;
+ } else {
+ hop->hdrlen += len_delta / 8;
+ }
+ memcpy((char *)hop + start, buf + (start & 3), new_end - start);
+ calipso_pad_write((unsigned char *)hop, new_end, pad);
+
+ return 0;
+}
+
+/**
+ * calipso_skbuff_delattr - Delete any CALIPSO options from a packet
+ * @skb: the packet
+ *
+ * Description:
+ * Removes any and all CALIPSO options from the given packet. Returns zero on
+ * success, negative values on failure.
+ *
+ */
+static int calipso_skbuff_delattr(struct sk_buff *skb)
+{
+ int ret_val;
+ struct ipv6hdr *ip6_hdr;
+ struct ipv6_opt_hdr *old_hop;
+ u32 old_hop_len, start = 0, end = 0, delta, size, pad;
+
+ if (!calipso_skbuff_optptr(skb))
+ return 0;
+
+ /* since we are changing the packet we should make a copy */
+ ret_val = skb_cow(skb, skb_headroom(skb));
+ if (ret_val < 0)
+ return ret_val;
+
+ ip6_hdr = ipv6_hdr(skb);
+ old_hop = (struct ipv6_opt_hdr *)(ip6_hdr + 1);
+ old_hop_len = ipv6_optlen(old_hop);
+
+ ret_val = calipso_opt_find(old_hop, &start, &end);
+ if (ret_val)
+ return ret_val;
+
+ if (start == sizeof(*old_hop) && end == old_hop_len) {
+ /* There's no other option in the header so we delete
+ * the whole thing. */
+ delta = old_hop_len;
+ size = sizeof(*ip6_hdr);
+ ip6_hdr->nexthdr = old_hop->nexthdr;
+ } else {
+ delta = (end - start) & ~7;
+ if (delta)
+ old_hop->hdrlen -= delta / 8;
+ pad = (end - start) & 7;
+ size = sizeof(*ip6_hdr) + start + pad;
+ calipso_pad_write((unsigned char *)old_hop, start, pad);
+ }
+
+ if (delta) {
+ skb_pull(skb, delta);
+ memmove((char *)ip6_hdr + delta, ip6_hdr, size);
+ skb_reset_network_header(skb);
+ }
+
+ return 0;
+}
+
+static const struct netlbl_calipso_ops ops = {
+ .doi_add = calipso_doi_add,
+ .doi_free = calipso_doi_free,
+ .doi_remove = calipso_doi_remove,
+ .doi_getdef = calipso_doi_getdef,
+ .doi_putdef = calipso_doi_putdef,
+ .doi_walk = calipso_doi_walk,
+ .sock_getattr = calipso_sock_getattr,
+ .sock_setattr = calipso_sock_setattr,
+ .sock_delattr = calipso_sock_delattr,
+ .req_setattr = calipso_req_setattr,
+ .req_delattr = calipso_req_delattr,
+ .opt_getattr = calipso_opt_getattr,
+ .skbuff_optptr = calipso_skbuff_optptr,
+ .skbuff_setattr = calipso_skbuff_setattr,
+ .skbuff_delattr = calipso_skbuff_delattr,
+ .cache_invalidate = calipso_cache_invalidate,
+ .cache_add = calipso_cache_add
+};
+
+/**
+ * calipso_init - Initialize the CALIPSO module
+ *
+ * Description:
+ * Initialize the CALIPSO module and prepare it for use. Returns zero on
+ * success and negative values on failure.
+ *
+ */
+int __init calipso_init(void)
+{
+ int ret_val;
+
+ ret_val = calipso_cache_init();
+ if (!ret_val)
+ netlbl_calipso_ops_register(&ops);
+ return ret_val;
+}
+
+void calipso_exit(void)
+{
+ netlbl_calipso_ops_register(NULL);
+ calipso_cache_invalidate();
+ kfree(calipso_cache);
+}
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
new file mode 100644
index 0000000..1ede7a1
--- /dev/null
+++ b/net/ipv6/datagram.c
@@ -0,0 +1,1049 @@
+/*
+ * common UDP/RAW code
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in6.h>
+#include <linux/ipv6.h>
+#include <linux/route.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+#include <net/tcp_states.h>
+#include <net/dsfield.h>
+
+#include <linux/errqueue.h>
+#include <linux/uaccess.h>
+
+static bool ipv6_mapped_addr_any(const struct in6_addr *a)
+{
+ return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
+}
+
+static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ memset(fl6, 0, sizeof(*fl6));
+ fl6->flowi6_proto = sk->sk_protocol;
+ fl6->daddr = sk->sk_v6_daddr;
+ fl6->saddr = np->saddr;
+ fl6->flowi6_oif = sk->sk_bound_dev_if;
+ fl6->flowi6_mark = sk->sk_mark;
+ fl6->fl6_dport = inet->inet_dport;
+ fl6->fl6_sport = inet->inet_sport;
+ fl6->flowlabel = np->flow_label;
+ fl6->flowi6_uid = sk->sk_uid;
+
+ if (!fl6->flowi6_oif)
+ fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
+
+ if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr))
+ fl6->flowi6_oif = np->mcast_oif;
+
+ security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
+}
+
+int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
+{
+ struct ip6_flowlabel *flowlabel = NULL;
+ struct in6_addr *final_p, final;
+ struct ipv6_txoptions *opt;
+ struct dst_entry *dst;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct flowi6 fl6;
+ int err = 0;
+
+ if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) {
+ flowlabel = fl6_sock_lookup(sk, np->flow_label);
+ if (!flowlabel)
+ return -EINVAL;
+ }
+ ip6_datagram_flow_key_init(&fl6, sk);
+
+ rcu_read_lock();
+ opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
+ final_p = fl6_update_dst(&fl6, opt, &final);
+ rcu_read_unlock();
+
+ dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ goto out;
+ }
+
+ if (fix_sk_saddr) {
+ if (ipv6_addr_any(&np->saddr))
+ np->saddr = fl6.saddr;
+
+ if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
+ sk->sk_v6_rcv_saddr = fl6.saddr;
+ inet->inet_rcv_saddr = LOOPBACK4_IPV6;
+ if (sk->sk_prot->rehash)
+ sk->sk_prot->rehash(sk);
+ }
+ }
+
+ ip6_sk_dst_store_flow(sk, dst, &fl6);
+
+out:
+ fl6_sock_release(flowlabel);
+ return err;
+}
+
+void ip6_datagram_release_cb(struct sock *sk)
+{
+ struct dst_entry *dst;
+
+ if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
+ return;
+
+ rcu_read_lock();
+ dst = __sk_dst_get(sk);
+ if (!dst || !dst->obsolete ||
+ dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
+ rcu_read_unlock();
+ return;
+ }
+ rcu_read_unlock();
+
+ ip6_datagram_dst_update(sk, false);
+}
+EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
+
+int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr,
+ int addr_len)
+{
+ struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct in6_addr *daddr, old_daddr;
+ __be32 fl6_flowlabel = 0;
+ __be32 old_fl6_flowlabel;
+ __be16 old_dport;
+ int addr_type;
+ int err;
+
+ if (usin->sin6_family == AF_INET) {
+ if (__ipv6_only_sock(sk))
+ return -EAFNOSUPPORT;
+ err = __ip4_datagram_connect(sk, uaddr, addr_len);
+ goto ipv4_connected;
+ }
+
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+
+ if (usin->sin6_family != AF_INET6)
+ return -EAFNOSUPPORT;
+
+ if (np->sndflow)
+ fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
+
+ if (ipv6_addr_any(&usin->sin6_addr)) {
+ /*
+ * connect to self
+ */
+ if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
+ ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
+ &usin->sin6_addr);
+ else
+ usin->sin6_addr = in6addr_loopback;
+ }
+
+ addr_type = ipv6_addr_type(&usin->sin6_addr);
+
+ daddr = &usin->sin6_addr;
+
+ if (addr_type & IPV6_ADDR_MAPPED) {
+ struct sockaddr_in sin;
+
+ if (__ipv6_only_sock(sk)) {
+ err = -ENETUNREACH;
+ goto out;
+ }
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = daddr->s6_addr32[3];
+ sin.sin_port = usin->sin6_port;
+
+ err = __ip4_datagram_connect(sk,
+ (struct sockaddr *) &sin,
+ sizeof(sin));
+
+ipv4_connected:
+ if (err)
+ goto out;
+
+ ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
+
+ if (ipv6_addr_any(&np->saddr) ||
+ ipv6_mapped_addr_any(&np->saddr))
+ ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
+
+ if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
+ ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
+ ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
+ &sk->sk_v6_rcv_saddr);
+ if (sk->sk_prot->rehash)
+ sk->sk_prot->rehash(sk);
+ }
+
+ goto out;
+ }
+
+ if (__ipv6_addr_needs_scope_id(addr_type)) {
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ usin->sin6_scope_id) {
+ if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) {
+ err = -EINVAL;
+ goto out;
+ }
+ sk->sk_bound_dev_if = usin->sin6_scope_id;
+ }
+
+ if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
+ sk->sk_bound_dev_if = np->mcast_oif;
+
+ /* Connect to link-local address requires an interface */
+ if (!sk->sk_bound_dev_if) {
+ err = -EINVAL;
+ goto out;
+ }
+ }
+
+ /* save the current peer information before updating it */
+ old_daddr = sk->sk_v6_daddr;
+ old_fl6_flowlabel = np->flow_label;
+ old_dport = inet->inet_dport;
+
+ sk->sk_v6_daddr = *daddr;
+ np->flow_label = fl6_flowlabel;
+ inet->inet_dport = usin->sin6_port;
+
+ /*
+ * Check for a route to destination an obtain the
+ * destination cache for it.
+ */
+
+ err = ip6_datagram_dst_update(sk, true);
+ if (err) {
+ /* Restore the socket peer info, to keep it consistent with
+ * the old socket state
+ */
+ sk->sk_v6_daddr = old_daddr;
+ np->flow_label = old_fl6_flowlabel;
+ inet->inet_dport = old_dport;
+ goto out;
+ }
+
+ sk->sk_state = TCP_ESTABLISHED;
+ sk_set_txhash(sk);
+out:
+ return err;
+}
+EXPORT_SYMBOL_GPL(__ip6_datagram_connect);
+
+int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+ int res;
+
+ lock_sock(sk);
+ res = __ip6_datagram_connect(sk, uaddr, addr_len);
+ release_sock(sk);
+ return res;
+}
+EXPORT_SYMBOL_GPL(ip6_datagram_connect);
+
+int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
+ int addr_len)
+{
+ DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
+ if (sin6->sin6_family != AF_INET6)
+ return -EAFNOSUPPORT;
+ return ip6_datagram_connect(sk, uaddr, addr_len);
+}
+EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
+
+void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
+ __be16 port, u32 info, u8 *payload)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct icmp6hdr *icmph = icmp6_hdr(skb);
+ struct sock_exterr_skb *serr;
+
+ if (!np->recverr)
+ return;
+
+ skb = skb_clone(skb, GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ skb->protocol = htons(ETH_P_IPV6);
+
+ serr = SKB_EXT_ERR(skb);
+ serr->ee.ee_errno = err;
+ serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
+ serr->ee.ee_type = icmph->icmp6_type;
+ serr->ee.ee_code = icmph->icmp6_code;
+ serr->ee.ee_pad = 0;
+ serr->ee.ee_info = info;
+ serr->ee.ee_data = 0;
+ serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
+ skb_network_header(skb);
+ serr->port = port;
+
+ __skb_pull(skb, payload - skb->data);
+ skb_reset_transport_header(skb);
+
+ if (sock_queue_err_skb(sk, skb))
+ kfree_skb(skb);
+}
+
+void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
+{
+ const struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sock_exterr_skb *serr;
+ struct ipv6hdr *iph;
+ struct sk_buff *skb;
+
+ if (!np->recverr)
+ return;
+
+ skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ skb->protocol = htons(ETH_P_IPV6);
+
+ skb_put(skb, sizeof(struct ipv6hdr));
+ skb_reset_network_header(skb);
+ iph = ipv6_hdr(skb);
+ iph->daddr = fl6->daddr;
+
+ serr = SKB_EXT_ERR(skb);
+ serr->ee.ee_errno = err;
+ serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
+ serr->ee.ee_type = 0;
+ serr->ee.ee_code = 0;
+ serr->ee.ee_pad = 0;
+ serr->ee.ee_info = info;
+ serr->ee.ee_data = 0;
+ serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
+ serr->port = fl6->fl6_dport;
+
+ __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
+ skb_reset_transport_header(skb);
+
+ if (sock_queue_err_skb(sk, skb))
+ kfree_skb(skb);
+}
+
+void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6hdr *iph;
+ struct sk_buff *skb;
+ struct ip6_mtuinfo *mtu_info;
+
+ if (!np->rxopt.bits.rxpmtu)
+ return;
+
+ skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ skb_put(skb, sizeof(struct ipv6hdr));
+ skb_reset_network_header(skb);
+ iph = ipv6_hdr(skb);
+ iph->daddr = fl6->daddr;
+
+ mtu_info = IP6CBMTU(skb);
+
+ mtu_info->ip6m_mtu = mtu;
+ mtu_info->ip6m_addr.sin6_family = AF_INET6;
+ mtu_info->ip6m_addr.sin6_port = 0;
+ mtu_info->ip6m_addr.sin6_flowinfo = 0;
+ mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
+ mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
+
+ __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
+ skb_reset_transport_header(skb);
+
+ skb = xchg(&np->rxpmtu, skb);
+ kfree_skb(skb);
+}
+
+/* For some errors we have valid addr_offset even with zero payload and
+ * zero port. Also, addr_offset should be supported if port is set.
+ */
+static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
+{
+ return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
+ serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
+ serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
+}
+
+/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
+ *
+ * At one point, excluding local errors was a quick test to identify icmp/icmp6
+ * errors. This is no longer true, but the test remained, so the v6 stack,
+ * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
+ */
+static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
+ struct sock_exterr_skb *serr)
+{
+ if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
+ serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
+ return true;
+
+ if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
+ return false;
+
+ if (!IP6CB(skb)->iif)
+ return false;
+
+ return true;
+}
+
+/*
+ * Handle MSG_ERRQUEUE
+ */
+int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sock_exterr_skb *serr;
+ struct sk_buff *skb;
+ DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
+ struct {
+ struct sock_extended_err ee;
+ struct sockaddr_in6 offender;
+ } errhdr;
+ int err;
+ int copied;
+
+ err = -EAGAIN;
+ skb = sock_dequeue_err_skb(sk);
+ if (!skb)
+ goto out;
+
+ copied = skb->len;
+ if (copied > len) {
+ msg->msg_flags |= MSG_TRUNC;
+ copied = len;
+ }
+ err = skb_copy_datagram_msg(skb, 0, msg, copied);
+ if (unlikely(err)) {
+ kfree_skb(skb);
+ return err;
+ }
+ sock_recv_timestamp(msg, sk, skb);
+
+ serr = SKB_EXT_ERR(skb);
+
+ if (sin && ipv6_datagram_support_addr(serr)) {
+ const unsigned char *nh = skb_network_header(skb);
+ sin->sin6_family = AF_INET6;
+ sin->sin6_flowinfo = 0;
+ sin->sin6_port = serr->port;
+ if (skb->protocol == htons(ETH_P_IPV6)) {
+ const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
+ struct ipv6hdr, daddr);
+ sin->sin6_addr = ip6h->daddr;
+ if (np->sndflow)
+ sin->sin6_flowinfo = ip6_flowinfo(ip6h);
+ sin->sin6_scope_id =
+ ipv6_iface_scope_id(&sin->sin6_addr,
+ IP6CB(skb)->iif);
+ } else {
+ ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
+ &sin->sin6_addr);
+ sin->sin6_scope_id = 0;
+ }
+ *addr_len = sizeof(*sin);
+ }
+
+ memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
+ sin = &errhdr.offender;
+ memset(sin, 0, sizeof(*sin));
+
+ if (ip6_datagram_support_cmsg(skb, serr)) {
+ sin->sin6_family = AF_INET6;
+ if (np->rxopt.all)
+ ip6_datagram_recv_common_ctl(sk, msg, skb);
+ if (skb->protocol == htons(ETH_P_IPV6)) {
+ sin->sin6_addr = ipv6_hdr(skb)->saddr;
+ if (np->rxopt.all)
+ ip6_datagram_recv_specific_ctl(sk, msg, skb);
+ sin->sin6_scope_id =
+ ipv6_iface_scope_id(&sin->sin6_addr,
+ IP6CB(skb)->iif);
+ } else {
+ ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
+ &sin->sin6_addr);
+ if (inet_sk(sk)->cmsg_flags)
+ ip_cmsg_recv(msg, skb);
+ }
+ }
+
+ put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
+
+ /* Now we could try to dump offended packet options */
+
+ msg->msg_flags |= MSG_ERRQUEUE;
+ err = copied;
+
+ consume_skb(skb);
+out:
+ return err;
+}
+EXPORT_SYMBOL_GPL(ipv6_recv_error);
+
+/*
+ * Handle IPV6_RECVPATHMTU
+ */
+int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
+ int *addr_len)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sk_buff *skb;
+ struct ip6_mtuinfo mtu_info;
+ DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
+ int err;
+ int copied;
+
+ err = -EAGAIN;
+ skb = xchg(&np->rxpmtu, NULL);
+ if (!skb)
+ goto out;
+
+ copied = skb->len;
+ if (copied > len) {
+ msg->msg_flags |= MSG_TRUNC;
+ copied = len;
+ }
+ err = skb_copy_datagram_msg(skb, 0, msg, copied);
+ if (err)
+ goto out_free_skb;
+
+ sock_recv_timestamp(msg, sk, skb);
+
+ memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
+
+ if (sin) {
+ sin->sin6_family = AF_INET6;
+ sin->sin6_flowinfo = 0;
+ sin->sin6_port = 0;
+ sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
+ sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
+ *addr_len = sizeof(*sin);
+ }
+
+ put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
+
+ err = copied;
+
+out_free_skb:
+ kfree_skb(skb);
+out:
+ return err;
+}
+
+
+void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
+ struct sk_buff *skb)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
+
+ if (np->rxopt.bits.rxinfo) {
+ struct in6_pktinfo src_info;
+
+ if (is_ipv6) {
+ src_info.ipi6_ifindex = IP6CB(skb)->iif;
+ src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
+ } else {
+ src_info.ipi6_ifindex =
+ PKTINFO_SKB_CB(skb)->ipi_ifindex;
+ ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
+ &src_info.ipi6_addr);
+ }
+
+ if (src_info.ipi6_ifindex >= 0)
+ put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
+ sizeof(src_info), &src_info);
+ }
+}
+
+void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
+ struct sk_buff *skb)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct inet6_skb_parm *opt = IP6CB(skb);
+ unsigned char *nh = skb_network_header(skb);
+
+ if (np->rxopt.bits.rxhlim) {
+ int hlim = ipv6_hdr(skb)->hop_limit;
+ put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
+ }
+
+ if (np->rxopt.bits.rxtclass) {
+ int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
+ put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
+ }
+
+ if (np->rxopt.bits.rxflow) {
+ __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
+ if (flowinfo)
+ put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
+ }
+
+ /* HbH is allowed only once */
+ if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
+ u8 *ptr = nh + sizeof(struct ipv6hdr);
+ put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
+ }
+
+ if (opt->lastopt &&
+ (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
+ /*
+ * Silly enough, but we need to reparse in order to
+ * report extension headers (except for HbH)
+ * in order.
+ *
+ * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
+ * (and WILL NOT be) defined because
+ * IPV6_RECVDSTOPTS is more generic. --yoshfuji
+ */
+ unsigned int off = sizeof(struct ipv6hdr);
+ u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+
+ while (off <= opt->lastopt) {
+ unsigned int len;
+ u8 *ptr = nh + off;
+
+ switch (nexthdr) {
+ case IPPROTO_DSTOPTS:
+ nexthdr = ptr[0];
+ len = (ptr[1] + 1) << 3;
+ if (np->rxopt.bits.dstopts)
+ put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
+ break;
+ case IPPROTO_ROUTING:
+ nexthdr = ptr[0];
+ len = (ptr[1] + 1) << 3;
+ if (np->rxopt.bits.srcrt)
+ put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
+ break;
+ case IPPROTO_AH:
+ nexthdr = ptr[0];
+ len = (ptr[1] + 2) << 2;
+ break;
+ default:
+ nexthdr = ptr[0];
+ len = (ptr[1] + 1) << 3;
+ break;
+ }
+
+ off += len;
+ }
+ }
+
+ /* socket options in old style */
+ if (np->rxopt.bits.rxoinfo) {
+ struct in6_pktinfo src_info;
+
+ src_info.ipi6_ifindex = opt->iif;
+ src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
+ put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
+ }
+ if (np->rxopt.bits.rxohlim) {
+ int hlim = ipv6_hdr(skb)->hop_limit;
+ put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
+ }
+ if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
+ u8 *ptr = nh + sizeof(struct ipv6hdr);
+ put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
+ }
+ if (np->rxopt.bits.odstopts && opt->dst0) {
+ u8 *ptr = nh + opt->dst0;
+ put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
+ }
+ if (np->rxopt.bits.osrcrt && opt->srcrt) {
+ struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
+ put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
+ }
+ if (np->rxopt.bits.odstopts && opt->dst1) {
+ u8 *ptr = nh + opt->dst1;
+ put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
+ }
+ if (np->rxopt.bits.rxorigdstaddr) {
+ struct sockaddr_in6 sin6;
+ __be16 *ports;
+ int end;
+
+ end = skb_transport_offset(skb) + 4;
+ if (end <= 0 || pskb_may_pull(skb, end)) {
+ /* All current transport protocols have the port numbers in the
+ * first four bytes of the transport header and this function is
+ * written with this assumption in mind.
+ */
+ ports = (__be16 *)skb_transport_header(skb);
+
+ sin6.sin6_family = AF_INET6;
+ sin6.sin6_addr = ipv6_hdr(skb)->daddr;
+ sin6.sin6_port = ports[1];
+ sin6.sin6_flowinfo = 0;
+ sin6.sin6_scope_id =
+ ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
+ opt->iif);
+
+ put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
+ }
+ }
+ if (np->rxopt.bits.recvfragsize && opt->frag_max_size) {
+ int val = opt->frag_max_size;
+
+ put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val);
+ }
+}
+
+void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
+ struct sk_buff *skb)
+{
+ ip6_datagram_recv_common_ctl(sk, msg, skb);
+ ip6_datagram_recv_specific_ctl(sk, msg, skb);
+}
+EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
+
+int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
+ struct msghdr *msg, struct flowi6 *fl6,
+ struct ipcm6_cookie *ipc6)
+{
+ struct in6_pktinfo *src_info;
+ struct cmsghdr *cmsg;
+ struct ipv6_rt_hdr *rthdr;
+ struct ipv6_opt_hdr *hdr;
+ struct ipv6_txoptions *opt = ipc6->opt;
+ int len;
+ int err = 0;
+
+ for_each_cmsghdr(cmsg, msg) {
+ int addr_type;
+
+ if (!CMSG_OK(msg, cmsg)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ if (cmsg->cmsg_level == SOL_SOCKET) {
+ err = __sock_cmsg_send(sk, msg, cmsg, &ipc6->sockc);
+ if (err)
+ return err;
+ continue;
+ }
+
+ if (cmsg->cmsg_level != SOL_IPV6)
+ continue;
+
+ switch (cmsg->cmsg_type) {
+ case IPV6_PKTINFO:
+ case IPV6_2292PKTINFO:
+ {
+ struct net_device *dev = NULL;
+
+ if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
+
+ if (src_info->ipi6_ifindex) {
+ if (fl6->flowi6_oif &&
+ src_info->ipi6_ifindex != fl6->flowi6_oif)
+ return -EINVAL;
+ fl6->flowi6_oif = src_info->ipi6_ifindex;
+ }
+
+ addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
+
+ rcu_read_lock();
+ if (fl6->flowi6_oif) {
+ dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
+ if (!dev) {
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+ } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+
+ if (addr_type != IPV6_ADDR_ANY) {
+ int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
+ if (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) &&
+ !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr,
+ dev, !strict, 0,
+ IFA_F_TENTATIVE) &&
+ !ipv6_chk_acast_addr_src(net, dev,
+ &src_info->ipi6_addr))
+ err = -EINVAL;
+ else
+ fl6->saddr = src_info->ipi6_addr;
+ }
+
+ rcu_read_unlock();
+
+ if (err)
+ goto exit_f;
+
+ break;
+ }
+
+ case IPV6_FLOWINFO:
+ if (cmsg->cmsg_len < CMSG_LEN(4)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
+ if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+ }
+ fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
+ break;
+
+ case IPV6_2292HOPOPTS:
+ case IPV6_HOPOPTS:
+ if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
+ len = ((hdr->hdrlen + 1) << 3);
+ if (cmsg->cmsg_len < CMSG_LEN(len)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+ if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
+ err = -EPERM;
+ goto exit_f;
+ }
+ opt->opt_nflen += len;
+ opt->hopopt = hdr;
+ break;
+
+ case IPV6_2292DSTOPTS:
+ if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
+ len = ((hdr->hdrlen + 1) << 3);
+ if (cmsg->cmsg_len < CMSG_LEN(len)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+ if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
+ err = -EPERM;
+ goto exit_f;
+ }
+ if (opt->dst1opt) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+ opt->opt_flen += len;
+ opt->dst1opt = hdr;
+ break;
+
+ case IPV6_DSTOPTS:
+ case IPV6_RTHDRDSTOPTS:
+ if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
+ len = ((hdr->hdrlen + 1) << 3);
+ if (cmsg->cmsg_len < CMSG_LEN(len)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+ if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
+ err = -EPERM;
+ goto exit_f;
+ }
+ if (cmsg->cmsg_type == IPV6_DSTOPTS) {
+ opt->opt_flen += len;
+ opt->dst1opt = hdr;
+ } else {
+ opt->opt_nflen += len;
+ opt->dst0opt = hdr;
+ }
+ break;
+
+ case IPV6_2292RTHDR:
+ case IPV6_RTHDR:
+ if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
+
+ switch (rthdr->type) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ case IPV6_SRCRT_TYPE_2:
+ if (rthdr->hdrlen != 2 ||
+ rthdr->segments_left != 1) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+ break;
+#endif
+ default:
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ len = ((rthdr->hdrlen + 1) << 3);
+
+ if (cmsg->cmsg_len < CMSG_LEN(len)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ /* segments left must also match */
+ if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ opt->opt_nflen += len;
+ opt->srcrt = rthdr;
+
+ if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
+ int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
+
+ opt->opt_nflen += dsthdrlen;
+ opt->dst0opt = opt->dst1opt;
+ opt->dst1opt = NULL;
+ opt->opt_flen -= dsthdrlen;
+ }
+
+ break;
+
+ case IPV6_2292HOPLIMIT:
+ case IPV6_HOPLIMIT:
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ ipc6->hlimit = *(int *)CMSG_DATA(cmsg);
+ if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ break;
+
+ case IPV6_TCLASS:
+ {
+ int tc;
+
+ err = -EINVAL;
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
+ goto exit_f;
+
+ tc = *(int *)CMSG_DATA(cmsg);
+ if (tc < -1 || tc > 0xff)
+ goto exit_f;
+
+ err = 0;
+ ipc6->tclass = tc;
+
+ break;
+ }
+
+ case IPV6_DONTFRAG:
+ {
+ int df;
+
+ err = -EINVAL;
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
+ goto exit_f;
+
+ df = *(int *)CMSG_DATA(cmsg);
+ if (df < 0 || df > 1)
+ goto exit_f;
+
+ err = 0;
+ ipc6->dontfrag = df;
+
+ break;
+ }
+ default:
+ net_dbg_ratelimited("invalid cmsg type: %d\n",
+ cmsg->cmsg_type);
+ err = -EINVAL;
+ goto exit_f;
+ }
+ }
+
+exit_f:
+ return err;
+}
+EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
+
+void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
+ __u16 srcp, __u16 destp, int rqueue, int bucket)
+{
+ const struct in6_addr *dest, *src;
+
+ dest = &sp->sk_v6_daddr;
+ src = &sp->sk_v6_rcv_saddr;
+ seq_printf(seq,
+ "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
+ "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
+ bucket,
+ src->s6_addr32[0], src->s6_addr32[1],
+ src->s6_addr32[2], src->s6_addr32[3], srcp,
+ dest->s6_addr32[0], dest->s6_addr32[1],
+ dest->s6_addr32[2], dest->s6_addr32[3], destp,
+ sp->sk_state,
+ sk_wmem_alloc_get(sp),
+ rqueue,
+ 0, 0L, 0,
+ from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
+ 0,
+ sock_i_ino(sp),
+ refcount_read(&sp->sk_refcnt), sp,
+ atomic_read(&sp->sk_drops));
+}
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
new file mode 100644
index 0000000..88a7579
--- /dev/null
+++ b/net/ipv6/esp6.c
@@ -0,0 +1,972 @@
+/*
+ * Copyright (C)2002 USAGI/WIDE Project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors
+ *
+ * Mitsuru KANDA @USAGI : IPv6 Support
+ * Kazunori MIYAZAWA @USAGI :
+ * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ *
+ * This file is derived from net/ipv4/esp.c
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <crypto/aead.h>
+#include <crypto/authenc.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <net/ip.h>
+#include <net/xfrm.h>
+#include <net/esp.h>
+#include <linux/scatterlist.h>
+#include <linux/kernel.h>
+#include <linux/pfkeyv2.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <net/ip6_route.h>
+#include <net/icmp.h>
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <linux/icmpv6.h>
+
+#include <linux/highmem.h>
+
+struct esp_skb_cb {
+ struct xfrm_skb_cb xfrm;
+ void *tmp;
+};
+
+#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
+
+static u32 esp6_get_mtu(struct xfrm_state *x, int mtu);
+
+/*
+ * Allocate an AEAD request structure with extra space for SG and IV.
+ *
+ * For alignment considerations the upper 32 bits of the sequence number are
+ * placed at the front, if present. Followed by the IV, the request and finally
+ * the SG list.
+ *
+ * TODO: Use spare space in skb for this where possible.
+ */
+static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen)
+{
+ unsigned int len;
+
+ len = seqihlen;
+
+ len += crypto_aead_ivsize(aead);
+
+ if (len) {
+ len += crypto_aead_alignmask(aead) &
+ ~(crypto_tfm_ctx_alignment() - 1);
+ len = ALIGN(len, crypto_tfm_ctx_alignment());
+ }
+
+ len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
+ len = ALIGN(len, __alignof__(struct scatterlist));
+
+ len += sizeof(struct scatterlist) * nfrags;
+
+ return kmalloc(len, GFP_ATOMIC);
+}
+
+static inline __be32 *esp_tmp_seqhi(void *tmp)
+{
+ return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32));
+}
+
+static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen)
+{
+ return crypto_aead_ivsize(aead) ?
+ PTR_ALIGN((u8 *)tmp + seqhilen,
+ crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
+}
+
+static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
+{
+ struct aead_request *req;
+
+ req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
+ crypto_tfm_ctx_alignment());
+ aead_request_set_tfm(req, aead);
+ return req;
+}
+
+static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
+ struct aead_request *req)
+{
+ return (void *)ALIGN((unsigned long)(req + 1) +
+ crypto_aead_reqsize(aead),
+ __alignof__(struct scatterlist));
+}
+
+static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
+{
+ struct crypto_aead *aead = x->data;
+ int seqhilen = 0;
+ u8 *iv;
+ struct aead_request *req;
+ struct scatterlist *sg;
+
+ if (x->props.flags & XFRM_STATE_ESN)
+ seqhilen += sizeof(__be32);
+
+ iv = esp_tmp_iv(aead, tmp, seqhilen);
+ req = esp_tmp_req(aead, iv);
+
+ /* Unref skb_frag_pages in the src scatterlist if necessary.
+ * Skip the first sg which comes from skb->data.
+ */
+ if (req->src != req->dst)
+ for (sg = sg_next(req->src); sg; sg = sg_next(sg))
+ put_page(sg_page(sg));
+}
+
+static void esp_output_done(struct crypto_async_request *base, int err)
+{
+ struct sk_buff *skb = base->data;
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ void *tmp;
+ struct xfrm_state *x;
+
+ if (xo && (xo->flags & XFRM_DEV_RESUME))
+ x = skb->sp->xvec[skb->sp->len - 1];
+ else
+ x = skb_dst(skb)->xfrm;
+
+ tmp = ESP_SKB_CB(skb)->tmp;
+ esp_ssg_unref(x, tmp);
+ kfree(tmp);
+
+ if (xo && (xo->flags & XFRM_DEV_RESUME)) {
+ if (err) {
+ XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
+ kfree_skb(skb);
+ return;
+ }
+
+ skb_push(skb, skb->data - skb_mac_header(skb));
+ secpath_reset(skb);
+ xfrm_dev_resume(skb);
+ } else {
+ xfrm_output_resume(skb, err);
+ }
+}
+
+/* Move ESP header back into place. */
+static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
+{
+ struct ip_esp_hdr *esph = (void *)(skb->data + offset);
+ void *tmp = ESP_SKB_CB(skb)->tmp;
+ __be32 *seqhi = esp_tmp_seqhi(tmp);
+
+ esph->seq_no = esph->spi;
+ esph->spi = *seqhi;
+}
+
+static void esp_output_restore_header(struct sk_buff *skb)
+{
+ esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32));
+}
+
+static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
+ struct xfrm_state *x,
+ struct ip_esp_hdr *esph,
+ __be32 *seqhi)
+{
+ /* For ESN we move the header forward by 4 bytes to
+ * accomodate the high bits. We will move it back after
+ * encryption.
+ */
+ if ((x->props.flags & XFRM_STATE_ESN)) {
+ struct xfrm_offload *xo = xfrm_offload(skb);
+
+ esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
+ *seqhi = esph->spi;
+ if (xo)
+ esph->seq_no = htonl(xo->seq.hi);
+ else
+ esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
+ }
+
+ esph->spi = x->id.spi;
+
+ return esph;
+}
+
+static void esp_output_done_esn(struct crypto_async_request *base, int err)
+{
+ struct sk_buff *skb = base->data;
+
+ esp_output_restore_header(skb);
+ esp_output_done(base, err);
+}
+
+static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
+{
+ /* Fill padding... */
+ if (tfclen) {
+ memset(tail, 0, tfclen);
+ tail += tfclen;
+ }
+ do {
+ int i;
+ for (i = 0; i < plen - 2; i++)
+ tail[i] = i + 1;
+ } while (0);
+ tail[plen - 2] = plen - 2;
+ tail[plen - 1] = proto;
+}
+
+int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
+{
+ u8 *tail;
+ u8 *vaddr;
+ int nfrags;
+ struct page *page;
+ struct sk_buff *trailer;
+ int tailen = esp->tailen;
+
+ if (!skb_cloned(skb)) {
+ if (tailen <= skb_tailroom(skb)) {
+ nfrags = 1;
+ trailer = skb;
+ tail = skb_tail_pointer(trailer);
+
+ goto skip_cow;
+ } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
+ && !skb_has_frag_list(skb)) {
+ int allocsize;
+ struct sock *sk = skb->sk;
+ struct page_frag *pfrag = &x->xfrag;
+
+ esp->inplace = false;
+
+ allocsize = ALIGN(tailen, L1_CACHE_BYTES);
+
+ spin_lock_bh(&x->lock);
+
+ if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
+ spin_unlock_bh(&x->lock);
+ goto cow;
+ }
+
+ page = pfrag->page;
+ get_page(page);
+
+ vaddr = kmap_atomic(page);
+
+ tail = vaddr + pfrag->offset;
+
+ esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
+
+ kunmap_atomic(vaddr);
+
+ nfrags = skb_shinfo(skb)->nr_frags;
+
+ __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
+ tailen);
+ skb_shinfo(skb)->nr_frags = ++nfrags;
+
+ pfrag->offset = pfrag->offset + allocsize;
+
+ spin_unlock_bh(&x->lock);
+
+ nfrags++;
+
+ skb->len += tailen;
+ skb->data_len += tailen;
+ skb->truesize += tailen;
+ if (sk)
+ refcount_add(tailen, &sk->sk_wmem_alloc);
+
+ goto out;
+ }
+ }
+
+cow:
+ nfrags = skb_cow_data(skb, tailen, &trailer);
+ if (nfrags < 0)
+ goto out;
+ tail = skb_tail_pointer(trailer);
+
+skip_cow:
+ esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
+ pskb_put(skb, trailer, tailen);
+
+out:
+ return nfrags;
+}
+EXPORT_SYMBOL_GPL(esp6_output_head);
+
+int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
+{
+ u8 *iv;
+ int alen;
+ void *tmp;
+ int ivlen;
+ int assoclen;
+ int seqhilen;
+ __be32 *seqhi;
+ struct page *page;
+ struct ip_esp_hdr *esph;
+ struct aead_request *req;
+ struct crypto_aead *aead;
+ struct scatterlist *sg, *dsg;
+ int err = -ENOMEM;
+
+ assoclen = sizeof(struct ip_esp_hdr);
+ seqhilen = 0;
+
+ if (x->props.flags & XFRM_STATE_ESN) {
+ seqhilen += sizeof(__be32);
+ assoclen += sizeof(__be32);
+ }
+
+ aead = x->data;
+ alen = crypto_aead_authsize(aead);
+ ivlen = crypto_aead_ivsize(aead);
+
+ tmp = esp_alloc_tmp(aead, esp->nfrags + 2, seqhilen);
+ if (!tmp)
+ goto error;
+
+ seqhi = esp_tmp_seqhi(tmp);
+ iv = esp_tmp_iv(aead, tmp, seqhilen);
+ req = esp_tmp_req(aead, iv);
+ sg = esp_req_sg(aead, req);
+
+ if (esp->inplace)
+ dsg = sg;
+ else
+ dsg = &sg[esp->nfrags];
+
+ esph = esp_output_set_esn(skb, x, ip_esp_hdr(skb), seqhi);
+
+ sg_init_table(sg, esp->nfrags);
+ err = skb_to_sgvec(skb, sg,
+ (unsigned char *)esph - skb->data,
+ assoclen + ivlen + esp->clen + alen);
+ if (unlikely(err < 0))
+ goto error_free;
+
+ if (!esp->inplace) {
+ int allocsize;
+ struct page_frag *pfrag = &x->xfrag;
+
+ allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
+
+ spin_lock_bh(&x->lock);
+ if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
+ spin_unlock_bh(&x->lock);
+ goto error_free;
+ }
+
+ skb_shinfo(skb)->nr_frags = 1;
+
+ page = pfrag->page;
+ get_page(page);
+ /* replace page frags in skb with new page */
+ __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
+ pfrag->offset = pfrag->offset + allocsize;
+ spin_unlock_bh(&x->lock);
+
+ sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
+ err = skb_to_sgvec(skb, dsg,
+ (unsigned char *)esph - skb->data,
+ assoclen + ivlen + esp->clen + alen);
+ if (unlikely(err < 0))
+ goto error_free;
+ }
+
+ if ((x->props.flags & XFRM_STATE_ESN))
+ aead_request_set_callback(req, 0, esp_output_done_esn, skb);
+ else
+ aead_request_set_callback(req, 0, esp_output_done, skb);
+
+ aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
+ aead_request_set_ad(req, assoclen);
+
+ memset(iv, 0, ivlen);
+ memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
+ min(ivlen, 8));
+
+ ESP_SKB_CB(skb)->tmp = tmp;
+ err = crypto_aead_encrypt(req);
+
+ switch (err) {
+ case -EINPROGRESS:
+ goto error;
+
+ case -ENOSPC:
+ err = NET_XMIT_DROP;
+ break;
+
+ case 0:
+ if ((x->props.flags & XFRM_STATE_ESN))
+ esp_output_restore_header(skb);
+ }
+
+ if (sg != dsg)
+ esp_ssg_unref(x, tmp);
+
+error_free:
+ kfree(tmp);
+error:
+ return err;
+}
+EXPORT_SYMBOL_GPL(esp6_output_tail);
+
+static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int alen;
+ int blksize;
+ struct ip_esp_hdr *esph;
+ struct crypto_aead *aead;
+ struct esp_info esp;
+
+ esp.inplace = true;
+
+ esp.proto = *skb_mac_header(skb);
+ *skb_mac_header(skb) = IPPROTO_ESP;
+
+ /* skb is pure payload to encrypt */
+
+ aead = x->data;
+ alen = crypto_aead_authsize(aead);
+
+ esp.tfclen = 0;
+ if (x->tfcpad) {
+ struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
+ u32 padto;
+
+ padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached));
+ if (skb->len < padto)
+ esp.tfclen = padto - skb->len;
+ }
+ blksize = ALIGN(crypto_aead_blocksize(aead), 4);
+ esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
+ esp.plen = esp.clen - skb->len - esp.tfclen;
+ esp.tailen = esp.tfclen + esp.plen + alen;
+
+ esp.nfrags = esp6_output_head(x, skb, &esp);
+ if (esp.nfrags < 0)
+ return esp.nfrags;
+
+ esph = ip_esp_hdr(skb);
+ esph->spi = x->id.spi;
+
+ esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
+ esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
+ ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
+
+ skb_push(skb, -skb_network_offset(skb));
+
+ return esp6_output_tail(x, skb, &esp);
+}
+
+static inline int esp_remove_trailer(struct sk_buff *skb)
+{
+ struct xfrm_state *x = xfrm_input_state(skb);
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ struct crypto_aead *aead = x->data;
+ int alen, hlen, elen;
+ int padlen, trimlen;
+ __wsum csumdiff;
+ u8 nexthdr[2];
+ int ret;
+
+ alen = crypto_aead_authsize(aead);
+ hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
+ elen = skb->len - hlen;
+
+ if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
+ ret = xo->proto;
+ goto out;
+ }
+
+ ret = skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2);
+ BUG_ON(ret);
+
+ ret = -EINVAL;
+ padlen = nexthdr[0];
+ if (padlen + 2 + alen >= elen) {
+ net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
+ padlen + 2, elen - alen);
+ goto out;
+ }
+
+ trimlen = alen + padlen + 2;
+ if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
+ skb->csum = csum_block_sub(skb->csum, csumdiff,
+ skb->len - trimlen);
+ }
+ pskb_trim(skb, skb->len - trimlen);
+
+ ret = nexthdr[1];
+
+out:
+ return ret;
+}
+
+int esp6_input_done2(struct sk_buff *skb, int err)
+{
+ struct xfrm_state *x = xfrm_input_state(skb);
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ struct crypto_aead *aead = x->data;
+ int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
+ int hdr_len = skb_network_header_len(skb);
+
+ if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
+ kfree(ESP_SKB_CB(skb)->tmp);
+
+ if (unlikely(err))
+ goto out;
+
+ err = esp_remove_trailer(skb);
+ if (unlikely(err < 0))
+ goto out;
+
+ skb_postpull_rcsum(skb, skb_network_header(skb),
+ skb_network_header_len(skb));
+ skb_pull_rcsum(skb, hlen);
+ if (x->props.mode == XFRM_MODE_TUNNEL)
+ skb_reset_transport_header(skb);
+ else
+ skb_set_transport_header(skb, -hdr_len);
+
+ /* RFC4303: Drop dummy packets without any error */
+ if (err == IPPROTO_NONE)
+ err = -EINVAL;
+
+out:
+ return err;
+}
+EXPORT_SYMBOL_GPL(esp6_input_done2);
+
+static void esp_input_done(struct crypto_async_request *base, int err)
+{
+ struct sk_buff *skb = base->data;
+
+ xfrm_input_resume(skb, esp6_input_done2(skb, err));
+}
+
+static void esp_input_restore_header(struct sk_buff *skb)
+{
+ esp_restore_header(skb, 0);
+ __skb_pull(skb, 4);
+}
+
+static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
+{
+ struct xfrm_state *x = xfrm_input_state(skb);
+
+ /* For ESN we move the header forward by 4 bytes to
+ * accomodate the high bits. We will move it back after
+ * decryption.
+ */
+ if ((x->props.flags & XFRM_STATE_ESN)) {
+ struct ip_esp_hdr *esph = skb_push(skb, 4);
+
+ *seqhi = esph->spi;
+ esph->spi = esph->seq_no;
+ esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
+ }
+}
+
+static void esp_input_done_esn(struct crypto_async_request *base, int err)
+{
+ struct sk_buff *skb = base->data;
+
+ esp_input_restore_header(skb);
+ esp_input_done(base, err);
+}
+
+static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ip_esp_hdr *esph;
+ struct crypto_aead *aead = x->data;
+ struct aead_request *req;
+ struct sk_buff *trailer;
+ int ivlen = crypto_aead_ivsize(aead);
+ int elen = skb->len - sizeof(*esph) - ivlen;
+ int nfrags;
+ int assoclen;
+ int seqhilen;
+ int ret = 0;
+ void *tmp;
+ __be32 *seqhi;
+ u8 *iv;
+ struct scatterlist *sg;
+
+ if (!pskb_may_pull(skb, sizeof(*esph) + ivlen)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (elen <= 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ assoclen = sizeof(*esph);
+ seqhilen = 0;
+
+ if (x->props.flags & XFRM_STATE_ESN) {
+ seqhilen += sizeof(__be32);
+ assoclen += seqhilen;
+ }
+
+ if (!skb_cloned(skb)) {
+ if (!skb_is_nonlinear(skb)) {
+ nfrags = 1;
+
+ goto skip_cow;
+ } else if (!skb_has_frag_list(skb)) {
+ nfrags = skb_shinfo(skb)->nr_frags;
+ nfrags++;
+
+ goto skip_cow;
+ }
+ }
+
+ nfrags = skb_cow_data(skb, 0, &trailer);
+ if (nfrags < 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+skip_cow:
+ ret = -ENOMEM;
+ tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
+ if (!tmp)
+ goto out;
+
+ ESP_SKB_CB(skb)->tmp = tmp;
+ seqhi = esp_tmp_seqhi(tmp);
+ iv = esp_tmp_iv(aead, tmp, seqhilen);
+ req = esp_tmp_req(aead, iv);
+ sg = esp_req_sg(aead, req);
+
+ esp_input_set_header(skb, seqhi);
+
+ sg_init_table(sg, nfrags);
+ ret = skb_to_sgvec(skb, sg, 0, skb->len);
+ if (unlikely(ret < 0)) {
+ kfree(tmp);
+ goto out;
+ }
+
+ skb->ip_summed = CHECKSUM_NONE;
+
+ if ((x->props.flags & XFRM_STATE_ESN))
+ aead_request_set_callback(req, 0, esp_input_done_esn, skb);
+ else
+ aead_request_set_callback(req, 0, esp_input_done, skb);
+
+ aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
+ aead_request_set_ad(req, assoclen);
+
+ ret = crypto_aead_decrypt(req);
+ if (ret == -EINPROGRESS)
+ goto out;
+
+ if ((x->props.flags & XFRM_STATE_ESN))
+ esp_input_restore_header(skb);
+
+ ret = esp6_input_done2(skb, ret);
+
+out:
+ return ret;
+}
+
+static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
+{
+ struct crypto_aead *aead = x->data;
+ u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
+ unsigned int net_adj;
+
+ if (x->props.mode != XFRM_MODE_TUNNEL)
+ net_adj = sizeof(struct ipv6hdr);
+ else
+ net_adj = 0;
+
+ return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
+ net_adj) & ~(blksize - 1)) + net_adj - 2;
+}
+
+static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct net *net = dev_net(skb->dev);
+ const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
+ struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
+ struct xfrm_state *x;
+
+ if (type != ICMPV6_PKT_TOOBIG &&
+ type != NDISC_REDIRECT)
+ return 0;
+
+ x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
+ esph->spi, IPPROTO_ESP, AF_INET6);
+ if (!x)
+ return 0;
+
+ if (type == NDISC_REDIRECT)
+ ip6_redirect(skb, net, skb->dev->ifindex, 0,
+ sock_net_uid(net, NULL));
+ else
+ ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
+ xfrm_state_put(x);
+
+ return 0;
+}
+
+static void esp6_destroy(struct xfrm_state *x)
+{
+ struct crypto_aead *aead = x->data;
+
+ if (!aead)
+ return;
+
+ crypto_free_aead(aead);
+}
+
+static int esp_init_aead(struct xfrm_state *x)
+{
+ char aead_name[CRYPTO_MAX_ALG_NAME];
+ struct crypto_aead *aead;
+ int err;
+
+ err = -ENAMETOOLONG;
+ if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
+ x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
+ goto error;
+
+ aead = crypto_alloc_aead(aead_name, 0, 0);
+ err = PTR_ERR(aead);
+ if (IS_ERR(aead))
+ goto error;
+
+ x->data = aead;
+
+ err = crypto_aead_setkey(aead, x->aead->alg_key,
+ (x->aead->alg_key_len + 7) / 8);
+ if (err)
+ goto error;
+
+ err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
+ if (err)
+ goto error;
+
+error:
+ return err;
+}
+
+static int esp_init_authenc(struct xfrm_state *x)
+{
+ struct crypto_aead *aead;
+ struct crypto_authenc_key_param *param;
+ struct rtattr *rta;
+ char *key;
+ char *p;
+ char authenc_name[CRYPTO_MAX_ALG_NAME];
+ unsigned int keylen;
+ int err;
+
+ err = -EINVAL;
+ if (!x->ealg)
+ goto error;
+
+ err = -ENAMETOOLONG;
+
+ if ((x->props.flags & XFRM_STATE_ESN)) {
+ if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
+ "%s%sauthencesn(%s,%s)%s",
+ x->geniv ?: "", x->geniv ? "(" : "",
+ x->aalg ? x->aalg->alg_name : "digest_null",
+ x->ealg->alg_name,
+ x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
+ goto error;
+ } else {
+ if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
+ "%s%sauthenc(%s,%s)%s",
+ x->geniv ?: "", x->geniv ? "(" : "",
+ x->aalg ? x->aalg->alg_name : "digest_null",
+ x->ealg->alg_name,
+ x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
+ goto error;
+ }
+
+ aead = crypto_alloc_aead(authenc_name, 0, 0);
+ err = PTR_ERR(aead);
+ if (IS_ERR(aead))
+ goto error;
+
+ x->data = aead;
+
+ keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
+ (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
+ err = -ENOMEM;
+ key = kmalloc(keylen, GFP_KERNEL);
+ if (!key)
+ goto error;
+
+ p = key;
+ rta = (void *)p;
+ rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
+ rta->rta_len = RTA_LENGTH(sizeof(*param));
+ param = RTA_DATA(rta);
+ p += RTA_SPACE(sizeof(*param));
+
+ if (x->aalg) {
+ struct xfrm_algo_desc *aalg_desc;
+
+ memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
+ p += (x->aalg->alg_key_len + 7) / 8;
+
+ aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
+ BUG_ON(!aalg_desc);
+
+ err = -EINVAL;
+ if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
+ crypto_aead_authsize(aead)) {
+ pr_info("ESP: %s digestsize %u != %hu\n",
+ x->aalg->alg_name,
+ crypto_aead_authsize(aead),
+ aalg_desc->uinfo.auth.icv_fullbits / 8);
+ goto free_key;
+ }
+
+ err = crypto_aead_setauthsize(
+ aead, x->aalg->alg_trunc_len / 8);
+ if (err)
+ goto free_key;
+ }
+
+ param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
+ memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
+
+ err = crypto_aead_setkey(aead, key, keylen);
+
+free_key:
+ kfree(key);
+
+error:
+ return err;
+}
+
+static int esp6_init_state(struct xfrm_state *x)
+{
+ struct crypto_aead *aead;
+ u32 align;
+ int err;
+
+ if (x->encap)
+ return -EINVAL;
+
+ x->data = NULL;
+
+ if (x->aead)
+ err = esp_init_aead(x);
+ else
+ err = esp_init_authenc(x);
+
+ if (err)
+ goto error;
+
+ aead = x->data;
+
+ x->props.header_len = sizeof(struct ip_esp_hdr) +
+ crypto_aead_ivsize(aead);
+ switch (x->props.mode) {
+ case XFRM_MODE_BEET:
+ if (x->sel.family != AF_INET6)
+ x->props.header_len += IPV4_BEET_PHMAXLEN +
+ (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
+ break;
+ default:
+ case XFRM_MODE_TRANSPORT:
+ break;
+ case XFRM_MODE_TUNNEL:
+ x->props.header_len += sizeof(struct ipv6hdr);
+ break;
+ }
+
+ align = ALIGN(crypto_aead_blocksize(aead), 4);
+ x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
+
+error:
+ return err;
+}
+
+static int esp6_rcv_cb(struct sk_buff *skb, int err)
+{
+ return 0;
+}
+
+static const struct xfrm_type esp6_type = {
+ .description = "ESP6",
+ .owner = THIS_MODULE,
+ .proto = IPPROTO_ESP,
+ .flags = XFRM_TYPE_REPLAY_PROT,
+ .init_state = esp6_init_state,
+ .destructor = esp6_destroy,
+ .get_mtu = esp6_get_mtu,
+ .input = esp6_input,
+ .output = esp6_output,
+ .hdr_offset = xfrm6_find_1stfragopt,
+};
+
+static struct xfrm6_protocol esp6_protocol = {
+ .handler = xfrm6_rcv,
+ .cb_handler = esp6_rcv_cb,
+ .err_handler = esp6_err,
+ .priority = 0,
+};
+
+static int __init esp6_init(void)
+{
+ if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
+ pr_info("%s: can't add xfrm type\n", __func__);
+ return -EAGAIN;
+ }
+ if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) {
+ pr_info("%s: can't add protocol\n", __func__);
+ xfrm_unregister_type(&esp6_type, AF_INET6);
+ return -EAGAIN;
+ }
+
+ return 0;
+}
+
+static void __exit esp6_fini(void)
+{
+ if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0)
+ pr_info("%s: can't remove protocol\n", __func__);
+ if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
+ pr_info("%s: can't remove xfrm type\n", __func__);
+}
+
+module_init(esp6_init);
+module_exit(esp6_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);
diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c
new file mode 100644
index 0000000..6177e21
--- /dev/null
+++ b/net/ipv6/esp6_offload.c
@@ -0,0 +1,309 @@
+/*
+ * IPV6 GSO/GRO offload support
+ * Linux INET implementation
+ *
+ * Copyright (C) 2016 secunet Security Networks AG
+ * Author: Steffen Klassert <steffen.klassert@secunet.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * ESP GRO support
+ */
+
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <net/protocol.h>
+#include <crypto/aead.h>
+#include <crypto/authenc.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <net/ip.h>
+#include <net/xfrm.h>
+#include <net/esp.h>
+#include <linux/scatterlist.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <net/ip6_route.h>
+#include <net/ipv6.h>
+#include <linux/icmpv6.h>
+
+static __u16 esp6_nexthdr_esp_offset(struct ipv6hdr *ipv6_hdr, int nhlen)
+{
+ int off = sizeof(struct ipv6hdr);
+ struct ipv6_opt_hdr *exthdr;
+
+ if (likely(ipv6_hdr->nexthdr == NEXTHDR_ESP))
+ return offsetof(struct ipv6hdr, nexthdr);
+
+ while (off < nhlen) {
+ exthdr = (void *)ipv6_hdr + off;
+ if (exthdr->nexthdr == NEXTHDR_ESP)
+ return off;
+
+ off += ipv6_optlen(exthdr);
+ }
+
+ return 0;
+}
+
+static struct sk_buff *esp6_gro_receive(struct list_head *head,
+ struct sk_buff *skb)
+{
+ int offset = skb_gro_offset(skb);
+ struct xfrm_offload *xo;
+ struct xfrm_state *x;
+ __be32 seq;
+ __be32 spi;
+ int nhoff;
+ int err;
+
+ if (!pskb_pull(skb, offset))
+ return NULL;
+
+ if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
+ goto out;
+
+ xo = xfrm_offload(skb);
+ if (!xo || !(xo->flags & CRYPTO_DONE)) {
+ err = secpath_set(skb);
+ if (err)
+ goto out;
+
+ if (skb->sp->len == XFRM_MAX_DEPTH)
+ goto out;
+
+ x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
+ (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
+ spi, IPPROTO_ESP, AF_INET6);
+ if (!x)
+ goto out;
+
+ skb->sp->xvec[skb->sp->len++] = x;
+ skb->sp->olen++;
+
+ xo = xfrm_offload(skb);
+ if (!xo) {
+ xfrm_state_put(x);
+ goto out;
+ }
+ }
+
+ xo->flags |= XFRM_GRO;
+
+ nhoff = esp6_nexthdr_esp_offset(ipv6_hdr(skb), offset);
+ if (!nhoff)
+ goto out;
+
+ IP6CB(skb)->nhoff = nhoff;
+ XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
+ XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
+ XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
+ XFRM_SPI_SKB_CB(skb)->seq = seq;
+
+ /* We don't need to handle errors from xfrm_input, it does all
+ * the error handling and frees the resources on error. */
+ xfrm_input(skb, IPPROTO_ESP, spi, -2);
+
+ return ERR_PTR(-EINPROGRESS);
+out:
+ skb_push(skb, offset);
+ NAPI_GRO_CB(skb)->same_flow = 0;
+ NAPI_GRO_CB(skb)->flush = 1;
+
+ return NULL;
+}
+
+static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ip_esp_hdr *esph;
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ int proto = iph->nexthdr;
+
+ skb_push(skb, -skb_network_offset(skb));
+ esph = ip_esp_hdr(skb);
+ *skb_mac_header(skb) = IPPROTO_ESP;
+
+ esph->spi = x->id.spi;
+ esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
+
+ xo->proto = proto;
+}
+
+static struct sk_buff *esp6_gso_segment(struct sk_buff *skb,
+ netdev_features_t features)
+{
+ struct xfrm_state *x;
+ struct ip_esp_hdr *esph;
+ struct crypto_aead *aead;
+ netdev_features_t esp_features = features;
+ struct xfrm_offload *xo = xfrm_offload(skb);
+
+ if (!xo)
+ return ERR_PTR(-EINVAL);
+
+ if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP))
+ return ERR_PTR(-EINVAL);
+
+ x = skb->sp->xvec[skb->sp->len - 1];
+ aead = x->data;
+ esph = ip_esp_hdr(skb);
+
+ if (esph->spi != x->id.spi)
+ return ERR_PTR(-EINVAL);
+
+ if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
+ return ERR_PTR(-EINVAL);
+
+ __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead));
+
+ skb->encap_hdr_csum = 1;
+
+ if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev)
+ esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
+ else if (!(features & NETIF_F_HW_ESP_TX_CSUM))
+ esp_features = features & ~NETIF_F_CSUM_MASK;
+
+ xo->flags |= XFRM_GSO_SEGMENT;
+
+ return x->outer_mode->gso_segment(x, skb, esp_features);
+}
+
+static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct crypto_aead *aead = x->data;
+ struct xfrm_offload *xo = xfrm_offload(skb);
+
+ if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead)))
+ return -EINVAL;
+
+ if (!(xo->flags & CRYPTO_DONE))
+ skb->ip_summed = CHECKSUM_NONE;
+
+ return esp6_input_done2(skb, 0);
+}
+
+static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features)
+{
+ int len;
+ int err;
+ int alen;
+ int blksize;
+ struct xfrm_offload *xo;
+ struct ip_esp_hdr *esph;
+ struct crypto_aead *aead;
+ struct esp_info esp;
+ bool hw_offload = true;
+ __u32 seq;
+
+ esp.inplace = true;
+
+ xo = xfrm_offload(skb);
+
+ if (!xo)
+ return -EINVAL;
+
+ if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) {
+ xo->flags |= CRYPTO_FALLBACK;
+ hw_offload = false;
+ }
+
+ esp.proto = xo->proto;
+
+ /* skb is pure payload to encrypt */
+
+ aead = x->data;
+ alen = crypto_aead_authsize(aead);
+
+ esp.tfclen = 0;
+ /* XXX: Add support for tfc padding here. */
+
+ blksize = ALIGN(crypto_aead_blocksize(aead), 4);
+ esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
+ esp.plen = esp.clen - skb->len - esp.tfclen;
+ esp.tailen = esp.tfclen + esp.plen + alen;
+
+ if (!hw_offload || (hw_offload && !skb_is_gso(skb))) {
+ esp.nfrags = esp6_output_head(x, skb, &esp);
+ if (esp.nfrags < 0)
+ return esp.nfrags;
+ }
+
+ seq = xo->seq.low;
+
+ esph = ip_esp_hdr(skb);
+ esph->spi = x->id.spi;
+
+ skb_push(skb, -skb_network_offset(skb));
+
+ if (xo->flags & XFRM_GSO_SEGMENT) {
+ esph->seq_no = htonl(seq);
+
+ if (!skb_is_gso(skb))
+ xo->seq.low++;
+ else
+ xo->seq.low += skb_shinfo(skb)->gso_segs;
+ }
+
+ esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32));
+
+ len = skb->len - sizeof(struct ipv6hdr);
+ if (len > IPV6_MAXPLEN)
+ len = 0;
+
+ ipv6_hdr(skb)->payload_len = htons(len);
+
+ if (hw_offload)
+ return 0;
+
+ err = esp6_output_tail(x, skb, &esp);
+ if (err)
+ return err;
+
+ secpath_reset(skb);
+
+ return 0;
+}
+
+static const struct net_offload esp6_offload = {
+ .callbacks = {
+ .gro_receive = esp6_gro_receive,
+ .gso_segment = esp6_gso_segment,
+ },
+};
+
+static const struct xfrm_type_offload esp6_type_offload = {
+ .description = "ESP6 OFFLOAD",
+ .owner = THIS_MODULE,
+ .proto = IPPROTO_ESP,
+ .input_tail = esp6_input_tail,
+ .xmit = esp6_xmit,
+ .encap = esp6_gso_encap,
+};
+
+static int __init esp6_offload_init(void)
+{
+ if (xfrm_register_type_offload(&esp6_type_offload, AF_INET6) < 0) {
+ pr_info("%s: can't add xfrm type offload\n", __func__);
+ return -EAGAIN;
+ }
+
+ return inet6_add_offload(&esp6_offload, IPPROTO_ESP);
+}
+
+static void __exit esp6_offload_exit(void)
+{
+ if (xfrm_unregister_type_offload(&esp6_type_offload, AF_INET6) < 0)
+ pr_info("%s: can't remove xfrm type offload\n", __func__);
+
+ inet6_del_offload(&esp6_offload, IPPROTO_ESP);
+}
+
+module_init(esp6_offload_init);
+module_exit(esp6_offload_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
+MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET6, XFRM_PROTO_ESP);
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
new file mode 100644
index 0000000..20291c2
--- /dev/null
+++ b/net/ipv6/exthdrs.c
@@ -0,0 +1,1172 @@
+/*
+ * Extension Header handling for IPv6
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ * Andi Kleen <ak@muc.de>
+ * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/* Changes:
+ * yoshfuji : ensure not to overrun while parsing
+ * tlv options.
+ * Mitsuru KANDA @USAGI and: Remove ipv6_parse_exthdrs().
+ * YOSHIFUJI Hideaki @USAGI Register inbound extension header
+ * handlers as inet6_protocol{}.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/icmpv6.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include <net/dst.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/rawv6.h>
+#include <net/ndisc.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/calipso.h>
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+#include <net/xfrm.h>
+#endif
+#include <linux/seg6.h>
+#include <net/seg6.h>
+#ifdef CONFIG_IPV6_SEG6_HMAC
+#include <net/seg6_hmac.h>
+#endif
+
+#include <linux/uaccess.h>
+
+/*
+ * Parsing tlv encoded headers.
+ *
+ * Parsing function "func" returns true, if parsing succeed
+ * and false, if it failed.
+ * It MUST NOT touch skb->h.
+ */
+
+struct tlvtype_proc {
+ int type;
+ bool (*func)(struct sk_buff *skb, int offset);
+};
+
+/*********************
+ Generic functions
+ *********************/
+
+/* An unknown option is detected, decide what to do */
+
+static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff,
+ bool disallow_unknowns)
+{
+ if (disallow_unknowns) {
+ /* If unknown TLVs are disallowed by configuration
+ * then always silently drop packet. Note this also
+ * means no ICMP parameter problem is sent which
+ * could be a good property to mitigate a reflection DOS
+ * attack.
+ */
+
+ goto drop;
+ }
+
+ switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) {
+ case 0: /* ignore */
+ return true;
+
+ case 1: /* drop packet */
+ break;
+
+ case 3: /* Send ICMP if not a multicast address and drop packet */
+ /* Actually, it is redundant check. icmp_send
+ will recheck in any case.
+ */
+ if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr))
+ break;
+ /* fall through */
+ case 2: /* send ICMP PARM PROB regardless and drop packet */
+ icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff);
+ return false;
+ }
+
+drop:
+ kfree_skb(skb);
+ return false;
+}
+
+/* Parse tlv encoded option header (hop-by-hop or destination) */
+
+static bool ip6_parse_tlv(const struct tlvtype_proc *procs,
+ struct sk_buff *skb,
+ int max_count)
+{
+ int len = (skb_transport_header(skb)[1] + 1) << 3;
+ const unsigned char *nh = skb_network_header(skb);
+ int off = skb_network_header_len(skb);
+ const struct tlvtype_proc *curr;
+ bool disallow_unknowns = false;
+ int tlv_count = 0;
+ int padlen = 0;
+
+ if (unlikely(max_count < 0)) {
+ disallow_unknowns = true;
+ max_count = -max_count;
+ }
+
+ if (skb_transport_offset(skb) + len > skb_headlen(skb))
+ goto bad;
+
+ off += 2;
+ len -= 2;
+
+ while (len > 0) {
+ int optlen = nh[off + 1] + 2;
+ int i;
+
+ switch (nh[off]) {
+ case IPV6_TLV_PAD1:
+ optlen = 1;
+ padlen++;
+ if (padlen > 7)
+ goto bad;
+ break;
+
+ case IPV6_TLV_PADN:
+ /* RFC 2460 states that the purpose of PadN is
+ * to align the containing header to multiples
+ * of 8. 7 is therefore the highest valid value.
+ * See also RFC 4942, Section 2.1.9.5.
+ */
+ padlen += optlen;
+ if (padlen > 7)
+ goto bad;
+ /* RFC 4942 recommends receiving hosts to
+ * actively check PadN payload to contain
+ * only zeroes.
+ */
+ for (i = 2; i < optlen; i++) {
+ if (nh[off + i] != 0)
+ goto bad;
+ }
+ break;
+
+ default: /* Other TLV code so scan list */
+ if (optlen > len)
+ goto bad;
+
+ tlv_count++;
+ if (tlv_count > max_count)
+ goto bad;
+
+ for (curr = procs; curr->type >= 0; curr++) {
+ if (curr->type == nh[off]) {
+ /* type specific length/alignment
+ checks will be performed in the
+ func(). */
+ if (curr->func(skb, off) == false)
+ return false;
+ break;
+ }
+ }
+ if (curr->type < 0 &&
+ !ip6_tlvopt_unknown(skb, off, disallow_unknowns))
+ return false;
+
+ padlen = 0;
+ break;
+ }
+ off += optlen;
+ len -= optlen;
+ }
+
+ if (len == 0)
+ return true;
+bad:
+ kfree_skb(skb);
+ return false;
+}
+
+/*****************************
+ Destination options header.
+ *****************************/
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+static bool ipv6_dest_hao(struct sk_buff *skb, int optoff)
+{
+ struct ipv6_destopt_hao *hao;
+ struct inet6_skb_parm *opt = IP6CB(skb);
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ int ret;
+
+ if (opt->dsthao) {
+ net_dbg_ratelimited("hao duplicated\n");
+ goto discard;
+ }
+ opt->dsthao = opt->dst1;
+ opt->dst1 = 0;
+
+ hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff);
+
+ if (hao->length != 16) {
+ net_dbg_ratelimited("hao invalid option length = %d\n",
+ hao->length);
+ goto discard;
+ }
+
+ if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) {
+ net_dbg_ratelimited("hao is not an unicast addr: %pI6\n",
+ &hao->addr);
+ goto discard;
+ }
+
+ ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr,
+ (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS);
+ if (unlikely(ret < 0))
+ goto discard;
+
+ if (skb_cloned(skb)) {
+ if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+ goto discard;
+
+ /* update all variable using below by copied skbuff */
+ hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) +
+ optoff);
+ ipv6h = ipv6_hdr(skb);
+ }
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ skb->ip_summed = CHECKSUM_NONE;
+
+ swap(ipv6h->saddr, hao->addr);
+
+ if (skb->tstamp == 0)
+ __net_timestamp(skb);
+
+ return true;
+
+ discard:
+ kfree_skb(skb);
+ return false;
+}
+#endif
+
+static const struct tlvtype_proc tlvprocdestopt_lst[] = {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ {
+ .type = IPV6_TLV_HAO,
+ .func = ipv6_dest_hao,
+ },
+#endif
+ {-1, NULL}
+};
+
+static int ipv6_destopt_rcv(struct sk_buff *skb)
+{
+ struct inet6_dev *idev = __in6_dev_get(skb->dev);
+ struct inet6_skb_parm *opt = IP6CB(skb);
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ __u16 dstbuf;
+#endif
+ struct dst_entry *dst = skb_dst(skb);
+ struct net *net = dev_net(skb->dev);
+ int extlen;
+
+ if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
+ !pskb_may_pull(skb, (skb_transport_offset(skb) +
+ ((skb_transport_header(skb)[1] + 1) << 3)))) {
+ __IP6_INC_STATS(dev_net(dst->dev), idev,
+ IPSTATS_MIB_INHDRERRORS);
+fail_and_free:
+ kfree_skb(skb);
+ return -1;
+ }
+
+ extlen = (skb_transport_header(skb)[1] + 1) << 3;
+ if (extlen > net->ipv6.sysctl.max_dst_opts_len)
+ goto fail_and_free;
+
+ opt->lastopt = opt->dst1 = skb_network_header_len(skb);
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ dstbuf = opt->dst1;
+#endif
+
+ if (ip6_parse_tlv(tlvprocdestopt_lst, skb,
+ init_net.ipv6.sysctl.max_dst_opts_cnt)) {
+ skb->transport_header += extlen;
+ opt = IP6CB(skb);
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ opt->nhoff = dstbuf;
+#else
+ opt->nhoff = opt->dst1;
+#endif
+ return 1;
+ }
+
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ return -1;
+}
+
+static void seg6_update_csum(struct sk_buff *skb)
+{
+ struct ipv6_sr_hdr *hdr;
+ struct in6_addr *addr;
+ __be32 from, to;
+
+ /* srh is at transport offset and seg_left is already decremented
+ * but daddr is not yet updated with next segment
+ */
+
+ hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb);
+ addr = hdr->segments + hdr->segments_left;
+
+ hdr->segments_left++;
+ from = *(__be32 *)hdr;
+
+ hdr->segments_left--;
+ to = *(__be32 *)hdr;
+
+ /* update skb csum with diff resulting from seg_left decrement */
+
+ update_csum_diff4(skb, from, to);
+
+ /* compute csum diff between current and next segment and update */
+
+ update_csum_diff16(skb, (__be32 *)(&ipv6_hdr(skb)->daddr),
+ (__be32 *)addr);
+}
+
+static int ipv6_srh_rcv(struct sk_buff *skb)
+{
+ struct inet6_skb_parm *opt = IP6CB(skb);
+ struct net *net = dev_net(skb->dev);
+ struct ipv6_sr_hdr *hdr;
+ struct inet6_dev *idev;
+ struct in6_addr *addr;
+ int accept_seg6;
+
+ hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb);
+
+ idev = __in6_dev_get(skb->dev);
+
+ accept_seg6 = net->ipv6.devconf_all->seg6_enabled;
+ if (accept_seg6 > idev->cnf.seg6_enabled)
+ accept_seg6 = idev->cnf.seg6_enabled;
+
+ if (!accept_seg6) {
+ kfree_skb(skb);
+ return -1;
+ }
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ if (!seg6_hmac_validate_skb(skb)) {
+ kfree_skb(skb);
+ return -1;
+ }
+#endif
+
+looped_back:
+ if (hdr->segments_left == 0) {
+ if (hdr->nexthdr == NEXTHDR_IPV6) {
+ int offset = (hdr->hdrlen + 1) << 3;
+
+ skb_postpull_rcsum(skb, skb_network_header(skb),
+ skb_network_header_len(skb));
+
+ if (!pskb_pull(skb, offset)) {
+ kfree_skb(skb);
+ return -1;
+ }
+ skb_postpull_rcsum(skb, skb_transport_header(skb),
+ offset);
+
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+ skb->encapsulation = 0;
+
+ __skb_tunnel_rx(skb, skb->dev, net);
+
+ netif_rx(skb);
+ return -1;
+ }
+
+ opt->srcrt = skb_network_header_len(skb);
+ opt->lastopt = opt->srcrt;
+ skb->transport_header += (hdr->hdrlen + 1) << 3;
+ opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
+
+ return 1;
+ }
+
+ if (hdr->segments_left >= (hdr->hdrlen >> 1)) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
+ ((&hdr->segments_left) -
+ skb_network_header(skb)));
+ return -1;
+ }
+
+ if (skb_cloned(skb)) {
+ if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
+ __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_OUTDISCARDS);
+ kfree_skb(skb);
+ return -1;
+ }
+ }
+
+ hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb);
+
+ hdr->segments_left--;
+ addr = hdr->segments + hdr->segments_left;
+
+ skb_push(skb, sizeof(struct ipv6hdr));
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ seg6_update_csum(skb);
+
+ ipv6_hdr(skb)->daddr = *addr;
+
+ skb_dst_drop(skb);
+
+ ip6_route_input(skb);
+
+ if (skb_dst(skb)->error) {
+ dst_input(skb);
+ return -1;
+ }
+
+ if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) {
+ if (ipv6_hdr(skb)->hop_limit <= 1) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ icmpv6_send(skb, ICMPV6_TIME_EXCEED,
+ ICMPV6_EXC_HOPLIMIT, 0);
+ kfree_skb(skb);
+ return -1;
+ }
+ ipv6_hdr(skb)->hop_limit--;
+
+ skb_pull(skb, sizeof(struct ipv6hdr));
+ goto looped_back;
+ }
+
+ dst_input(skb);
+
+ return -1;
+}
+
+/********************************
+ Routing header.
+ ********************************/
+
+/* called with rcu_read_lock() */
+static int ipv6_rthdr_rcv(struct sk_buff *skb)
+{
+ struct inet6_dev *idev = __in6_dev_get(skb->dev);
+ struct inet6_skb_parm *opt = IP6CB(skb);
+ struct in6_addr *addr = NULL;
+ struct in6_addr daddr;
+ int n, i;
+ struct ipv6_rt_hdr *hdr;
+ struct rt0_hdr *rthdr;
+ struct net *net = dev_net(skb->dev);
+ int accept_source_route = net->ipv6.devconf_all->accept_source_route;
+
+ idev = __in6_dev_get(skb->dev);
+ if (idev && accept_source_route > idev->cnf.accept_source_route)
+ accept_source_route = idev->cnf.accept_source_route;
+
+ if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
+ !pskb_may_pull(skb, (skb_transport_offset(skb) +
+ ((skb_transport_header(skb)[1] + 1) << 3)))) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ kfree_skb(skb);
+ return -1;
+ }
+
+ hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
+
+ if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) ||
+ skb->pkt_type != PACKET_HOST) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
+ kfree_skb(skb);
+ return -1;
+ }
+
+ /* segment routing */
+ if (hdr->type == IPV6_SRCRT_TYPE_4)
+ return ipv6_srh_rcv(skb);
+
+looped_back:
+ if (hdr->segments_left == 0) {
+ switch (hdr->type) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ case IPV6_SRCRT_TYPE_2:
+ /* Silently discard type 2 header unless it was
+ * processed by own
+ */
+ if (!addr) {
+ __IP6_INC_STATS(net, idev,
+ IPSTATS_MIB_INADDRERRORS);
+ kfree_skb(skb);
+ return -1;
+ }
+ break;
+#endif
+ default:
+ break;
+ }
+
+ opt->lastopt = opt->srcrt = skb_network_header_len(skb);
+ skb->transport_header += (hdr->hdrlen + 1) << 3;
+ opt->dst0 = opt->dst1;
+ opt->dst1 = 0;
+ opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
+ return 1;
+ }
+
+ switch (hdr->type) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ case IPV6_SRCRT_TYPE_2:
+ if (accept_source_route < 0)
+ goto unknown_rh;
+ /* Silently discard invalid RTH type 2 */
+ if (hdr->hdrlen != 2 || hdr->segments_left != 1) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ kfree_skb(skb);
+ return -1;
+ }
+ break;
+#endif
+ default:
+ goto unknown_rh;
+ }
+
+ /*
+ * This is the routing header forwarding algorithm from
+ * RFC 2460, page 16.
+ */
+
+ n = hdr->hdrlen >> 1;
+
+ if (hdr->segments_left > n) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
+ ((&hdr->segments_left) -
+ skb_network_header(skb)));
+ return -1;
+ }
+
+ /* We are about to mangle packet header. Be careful!
+ Do not damage packets queued somewhere.
+ */
+ if (skb_cloned(skb)) {
+ /* the copy is a forwarded packet */
+ if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
+ __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_OUTDISCARDS);
+ kfree_skb(skb);
+ return -1;
+ }
+ hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
+ }
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ skb->ip_summed = CHECKSUM_NONE;
+
+ i = n - --hdr->segments_left;
+
+ rthdr = (struct rt0_hdr *) hdr;
+ addr = rthdr->addr;
+ addr += i - 1;
+
+ switch (hdr->type) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ case IPV6_SRCRT_TYPE_2:
+ if (xfrm6_input_addr(skb, (xfrm_address_t *)addr,
+ (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
+ IPPROTO_ROUTING) < 0) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
+ kfree_skb(skb);
+ return -1;
+ }
+ if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
+ kfree_skb(skb);
+ return -1;
+ }
+ break;
+#endif
+ default:
+ break;
+ }
+
+ if (ipv6_addr_is_multicast(addr)) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
+ kfree_skb(skb);
+ return -1;
+ }
+
+ daddr = *addr;
+ *addr = ipv6_hdr(skb)->daddr;
+ ipv6_hdr(skb)->daddr = daddr;
+
+ skb_dst_drop(skb);
+ ip6_route_input(skb);
+ if (skb_dst(skb)->error) {
+ skb_push(skb, skb->data - skb_network_header(skb));
+ dst_input(skb);
+ return -1;
+ }
+
+ if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) {
+ if (ipv6_hdr(skb)->hop_limit <= 1) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
+ 0);
+ kfree_skb(skb);
+ return -1;
+ }
+ ipv6_hdr(skb)->hop_limit--;
+ goto looped_back;
+ }
+
+ skb_push(skb, skb->data - skb_network_header(skb));
+ dst_input(skb);
+ return -1;
+
+unknown_rh:
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
+ (&hdr->type) - skb_network_header(skb));
+ return -1;
+}
+
+static const struct inet6_protocol rthdr_protocol = {
+ .handler = ipv6_rthdr_rcv,
+ .flags = INET6_PROTO_NOPOLICY,
+};
+
+static const struct inet6_protocol destopt_protocol = {
+ .handler = ipv6_destopt_rcv,
+ .flags = INET6_PROTO_NOPOLICY,
+};
+
+static const struct inet6_protocol nodata_protocol = {
+ .handler = dst_discard,
+ .flags = INET6_PROTO_NOPOLICY,
+};
+
+int __init ipv6_exthdrs_init(void)
+{
+ int ret;
+
+ ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING);
+ if (ret)
+ goto out;
+
+ ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
+ if (ret)
+ goto out_rthdr;
+
+ ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE);
+ if (ret)
+ goto out_destopt;
+
+out:
+ return ret;
+out_destopt:
+ inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
+out_rthdr:
+ inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
+ goto out;
+};
+
+void ipv6_exthdrs_exit(void)
+{
+ inet6_del_protocol(&nodata_protocol, IPPROTO_NONE);
+ inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
+ inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
+}
+
+/**********************************
+ Hop-by-hop options.
+ **********************************/
+
+/*
+ * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input().
+ */
+static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb)
+{
+ return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev);
+}
+
+static inline struct net *ipv6_skb_net(struct sk_buff *skb)
+{
+ return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev);
+}
+
+/* Router Alert as of RFC 2711 */
+
+static bool ipv6_hop_ra(struct sk_buff *skb, int optoff)
+{
+ const unsigned char *nh = skb_network_header(skb);
+
+ if (nh[optoff + 1] == 2) {
+ IP6CB(skb)->flags |= IP6SKB_ROUTERALERT;
+ memcpy(&IP6CB(skb)->ra, nh + optoff + 2, sizeof(IP6CB(skb)->ra));
+ return true;
+ }
+ net_dbg_ratelimited("ipv6_hop_ra: wrong RA length %d\n",
+ nh[optoff + 1]);
+ kfree_skb(skb);
+ return false;
+}
+
+/* Jumbo payload */
+
+static bool ipv6_hop_jumbo(struct sk_buff *skb, int optoff)
+{
+ const unsigned char *nh = skb_network_header(skb);
+ struct inet6_dev *idev = __in6_dev_get_safely(skb->dev);
+ struct net *net = ipv6_skb_net(skb);
+ u32 pkt_len;
+
+ if (nh[optoff + 1] != 4 || (optoff & 3) != 2) {
+ net_dbg_ratelimited("ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n",
+ nh[optoff+1]);
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ goto drop;
+ }
+
+ pkt_len = ntohl(*(__be32 *)(nh + optoff + 2));
+ if (pkt_len <= IPV6_MAXPLEN) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2);
+ return false;
+ }
+ if (ipv6_hdr(skb)->payload_len) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff);
+ return false;
+ }
+
+ if (pkt_len > skb->len - sizeof(struct ipv6hdr)) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INTRUNCATEDPKTS);
+ goto drop;
+ }
+
+ if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
+ goto drop;
+
+ IP6CB(skb)->flags |= IP6SKB_JUMBOGRAM;
+ return true;
+
+drop:
+ kfree_skb(skb);
+ return false;
+}
+
+/* CALIPSO RFC 5570 */
+
+static bool ipv6_hop_calipso(struct sk_buff *skb, int optoff)
+{
+ const unsigned char *nh = skb_network_header(skb);
+
+ if (nh[optoff + 1] < 8)
+ goto drop;
+
+ if (nh[optoff + 6] * 4 + 8 > nh[optoff + 1])
+ goto drop;
+
+ if (!calipso_validate(skb, nh + optoff))
+ goto drop;
+
+ return true;
+
+drop:
+ kfree_skb(skb);
+ return false;
+}
+
+static const struct tlvtype_proc tlvprochopopt_lst[] = {
+ {
+ .type = IPV6_TLV_ROUTERALERT,
+ .func = ipv6_hop_ra,
+ },
+ {
+ .type = IPV6_TLV_JUMBO,
+ .func = ipv6_hop_jumbo,
+ },
+ {
+ .type = IPV6_TLV_CALIPSO,
+ .func = ipv6_hop_calipso,
+ },
+ { -1, }
+};
+
+int ipv6_parse_hopopts(struct sk_buff *skb)
+{
+ struct inet6_skb_parm *opt = IP6CB(skb);
+ struct net *net = dev_net(skb->dev);
+ int extlen;
+
+ /*
+ * skb_network_header(skb) is equal to skb->data, and
+ * skb_network_header_len(skb) is always equal to
+ * sizeof(struct ipv6hdr) by definition of
+ * hop-by-hop options.
+ */
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) ||
+ !pskb_may_pull(skb, (sizeof(struct ipv6hdr) +
+ ((skb_transport_header(skb)[1] + 1) << 3)))) {
+fail_and_free:
+ kfree_skb(skb);
+ return -1;
+ }
+
+ extlen = (skb_transport_header(skb)[1] + 1) << 3;
+ if (extlen > net->ipv6.sysctl.max_hbh_opts_len)
+ goto fail_and_free;
+
+ opt->flags |= IP6SKB_HOPBYHOP;
+ if (ip6_parse_tlv(tlvprochopopt_lst, skb,
+ init_net.ipv6.sysctl.max_hbh_opts_cnt)) {
+ skb->transport_header += extlen;
+ opt = IP6CB(skb);
+ opt->nhoff = sizeof(struct ipv6hdr);
+ return 1;
+ }
+ return -1;
+}
+
+/*
+ * Creating outbound headers.
+ *
+ * "build" functions work when skb is filled from head to tail (datagram)
+ * "push" functions work when headers are added from tail to head (tcp)
+ *
+ * In both cases we assume, that caller reserved enough room
+ * for headers.
+ */
+
+static void ipv6_push_rthdr0(struct sk_buff *skb, u8 *proto,
+ struct ipv6_rt_hdr *opt,
+ struct in6_addr **addr_p, struct in6_addr *saddr)
+{
+ struct rt0_hdr *phdr, *ihdr;
+ int hops;
+
+ ihdr = (struct rt0_hdr *) opt;
+
+ phdr = skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3);
+ memcpy(phdr, ihdr, sizeof(struct rt0_hdr));
+
+ hops = ihdr->rt_hdr.hdrlen >> 1;
+
+ if (hops > 1)
+ memcpy(phdr->addr, ihdr->addr + 1,
+ (hops - 1) * sizeof(struct in6_addr));
+
+ phdr->addr[hops - 1] = **addr_p;
+ *addr_p = ihdr->addr;
+
+ phdr->rt_hdr.nexthdr = *proto;
+ *proto = NEXTHDR_ROUTING;
+}
+
+static void ipv6_push_rthdr4(struct sk_buff *skb, u8 *proto,
+ struct ipv6_rt_hdr *opt,
+ struct in6_addr **addr_p, struct in6_addr *saddr)
+{
+ struct ipv6_sr_hdr *sr_phdr, *sr_ihdr;
+ int plen, hops;
+
+ sr_ihdr = (struct ipv6_sr_hdr *)opt;
+ plen = (sr_ihdr->hdrlen + 1) << 3;
+
+ sr_phdr = skb_push(skb, plen);
+ memcpy(sr_phdr, sr_ihdr, sizeof(struct ipv6_sr_hdr));
+
+ hops = sr_ihdr->first_segment + 1;
+ memcpy(sr_phdr->segments + 1, sr_ihdr->segments + 1,
+ (hops - 1) * sizeof(struct in6_addr));
+
+ sr_phdr->segments[0] = **addr_p;
+ *addr_p = &sr_ihdr->segments[sr_ihdr->segments_left];
+
+ if (sr_ihdr->hdrlen > hops * 2) {
+ int tlvs_offset, tlvs_length;
+
+ tlvs_offset = (1 + hops * 2) << 3;
+ tlvs_length = (sr_ihdr->hdrlen - hops * 2) << 3;
+ memcpy((char *)sr_phdr + tlvs_offset,
+ (char *)sr_ihdr + tlvs_offset, tlvs_length);
+ }
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ if (sr_has_hmac(sr_phdr)) {
+ struct net *net = NULL;
+
+ if (skb->dev)
+ net = dev_net(skb->dev);
+ else if (skb->sk)
+ net = sock_net(skb->sk);
+
+ WARN_ON(!net);
+
+ if (net)
+ seg6_push_hmac(net, saddr, sr_phdr);
+ }
+#endif
+
+ sr_phdr->nexthdr = *proto;
+ *proto = NEXTHDR_ROUTING;
+}
+
+static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
+ struct ipv6_rt_hdr *opt,
+ struct in6_addr **addr_p, struct in6_addr *saddr)
+{
+ switch (opt->type) {
+ case IPV6_SRCRT_TYPE_0:
+ case IPV6_SRCRT_STRICT:
+ case IPV6_SRCRT_TYPE_2:
+ ipv6_push_rthdr0(skb, proto, opt, addr_p, saddr);
+ break;
+ case IPV6_SRCRT_TYPE_4:
+ ipv6_push_rthdr4(skb, proto, opt, addr_p, saddr);
+ break;
+ default:
+ break;
+ }
+}
+
+static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt)
+{
+ struct ipv6_opt_hdr *h = skb_push(skb, ipv6_optlen(opt));
+
+ memcpy(h, opt, ipv6_optlen(opt));
+ h->nexthdr = *proto;
+ *proto = type;
+}
+
+void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
+ u8 *proto,
+ struct in6_addr **daddr, struct in6_addr *saddr)
+{
+ if (opt->srcrt) {
+ ipv6_push_rthdr(skb, proto, opt->srcrt, daddr, saddr);
+ /*
+ * IPV6_RTHDRDSTOPTS is ignored
+ * unless IPV6_RTHDR is set (RFC3542).
+ */
+ if (opt->dst0opt)
+ ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
+ }
+ if (opt->hopopt)
+ ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
+}
+
+void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto)
+{
+ if (opt->dst1opt)
+ ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt);
+}
+EXPORT_SYMBOL(ipv6_push_frag_opts);
+
+struct ipv6_txoptions *
+ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt)
+{
+ struct ipv6_txoptions *opt2;
+
+ opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC);
+ if (opt2) {
+ long dif = (char *)opt2 - (char *)opt;
+ memcpy(opt2, opt, opt->tot_len);
+ if (opt2->hopopt)
+ *((char **)&opt2->hopopt) += dif;
+ if (opt2->dst0opt)
+ *((char **)&opt2->dst0opt) += dif;
+ if (opt2->dst1opt)
+ *((char **)&opt2->dst1opt) += dif;
+ if (opt2->srcrt)
+ *((char **)&opt2->srcrt) += dif;
+ refcount_set(&opt2->refcnt, 1);
+ }
+ return opt2;
+}
+EXPORT_SYMBOL_GPL(ipv6_dup_options);
+
+static void ipv6_renew_option(int renewtype,
+ struct ipv6_opt_hdr **dest,
+ struct ipv6_opt_hdr *old,
+ struct ipv6_opt_hdr *new,
+ int newtype, char **p)
+{
+ struct ipv6_opt_hdr *src;
+
+ src = (renewtype == newtype ? new : old);
+ if (!src)
+ return;
+
+ memcpy(*p, src, ipv6_optlen(src));
+ *dest = (struct ipv6_opt_hdr *)*p;
+ *p += CMSG_ALIGN(ipv6_optlen(*dest));
+}
+
+/**
+ * ipv6_renew_options - replace a specific ext hdr with a new one.
+ *
+ * @sk: sock from which to allocate memory
+ * @opt: original options
+ * @newtype: option type to replace in @opt
+ * @newopt: new option of type @newtype to replace (user-mem)
+ * @newoptlen: length of @newopt
+ *
+ * Returns a new set of options which is a copy of @opt with the
+ * option type @newtype replaced with @newopt.
+ *
+ * @opt may be NULL, in which case a new set of options is returned
+ * containing just @newopt.
+ *
+ * @newopt may be NULL, in which case the specified option type is
+ * not copied into the new set of options.
+ *
+ * The new set of options is allocated from the socket option memory
+ * buffer of @sk.
+ */
+struct ipv6_txoptions *
+ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
+ int newtype, struct ipv6_opt_hdr *newopt)
+{
+ int tot_len = 0;
+ char *p;
+ struct ipv6_txoptions *opt2;
+
+ if (opt) {
+ if (newtype != IPV6_HOPOPTS && opt->hopopt)
+ tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt));
+ if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt)
+ tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt));
+ if (newtype != IPV6_RTHDR && opt->srcrt)
+ tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt));
+ if (newtype != IPV6_DSTOPTS && opt->dst1opt)
+ tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt));
+ }
+
+ if (newopt)
+ tot_len += CMSG_ALIGN(ipv6_optlen(newopt));
+
+ if (!tot_len)
+ return NULL;
+
+ tot_len += sizeof(*opt2);
+ opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC);
+ if (!opt2)
+ return ERR_PTR(-ENOBUFS);
+
+ memset(opt2, 0, tot_len);
+ refcount_set(&opt2->refcnt, 1);
+ opt2->tot_len = tot_len;
+ p = (char *)(opt2 + 1);
+
+ ipv6_renew_option(IPV6_HOPOPTS, &opt2->hopopt,
+ (opt ? opt->hopopt : NULL),
+ newopt, newtype, &p);
+ ipv6_renew_option(IPV6_RTHDRDSTOPTS, &opt2->dst0opt,
+ (opt ? opt->dst0opt : NULL),
+ newopt, newtype, &p);
+ ipv6_renew_option(IPV6_RTHDR,
+ (struct ipv6_opt_hdr **)&opt2->srcrt,
+ (opt ? (struct ipv6_opt_hdr *)opt->srcrt : NULL),
+ newopt, newtype, &p);
+ ipv6_renew_option(IPV6_DSTOPTS, &opt2->dst1opt,
+ (opt ? opt->dst1opt : NULL),
+ newopt, newtype, &p);
+
+ opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) +
+ (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) +
+ (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0);
+ opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0);
+
+ return opt2;
+}
+
+struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
+ struct ipv6_txoptions *opt)
+{
+ /*
+ * ignore the dest before srcrt unless srcrt is being included.
+ * --yoshfuji
+ */
+ if (opt && opt->dst0opt && !opt->srcrt) {
+ if (opt_space != opt) {
+ memcpy(opt_space, opt, sizeof(*opt_space));
+ opt = opt_space;
+ }
+ opt->opt_nflen -= ipv6_optlen(opt->dst0opt);
+ opt->dst0opt = NULL;
+ }
+
+ return opt;
+}
+EXPORT_SYMBOL_GPL(ipv6_fixup_options);
+
+/**
+ * fl6_update_dst - update flowi destination address with info given
+ * by srcrt option, if any.
+ *
+ * @fl6: flowi6 for which daddr is to be updated
+ * @opt: struct ipv6_txoptions in which to look for srcrt opt
+ * @orig: copy of original daddr address if modified
+ *
+ * Returns NULL if no txoptions or no srcrt, otherwise returns orig
+ * and initial value of fl6->daddr set in orig
+ */
+struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
+ const struct ipv6_txoptions *opt,
+ struct in6_addr *orig)
+{
+ if (!opt || !opt->srcrt)
+ return NULL;
+
+ *orig = fl6->daddr;
+
+ switch (opt->srcrt->type) {
+ case IPV6_SRCRT_TYPE_0:
+ case IPV6_SRCRT_STRICT:
+ case IPV6_SRCRT_TYPE_2:
+ fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr;
+ break;
+ case IPV6_SRCRT_TYPE_4:
+ {
+ struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)opt->srcrt;
+
+ fl6->daddr = srh->segments[srh->segments_left];
+ break;
+ }
+ default:
+ return NULL;
+ }
+
+ return orig;
+}
+EXPORT_SYMBOL_GPL(fl6_update_dst);
diff --git a/net/ipv6/exthdrs_core.c b/net/ipv6/exthdrs_core.c
new file mode 100644
index 0000000..ae365df
--- /dev/null
+++ b/net/ipv6/exthdrs_core.c
@@ -0,0 +1,281 @@
+/*
+ * IPv6 library code, needed by static components when full IPv6 support is
+ * not configured or static.
+ */
+#include <linux/export.h>
+#include <net/ipv6.h>
+
+/*
+ * find out if nexthdr is a well-known extension header or a protocol
+ */
+
+bool ipv6_ext_hdr(u8 nexthdr)
+{
+ /*
+ * find out if nexthdr is an extension header or a protocol
+ */
+ return (nexthdr == NEXTHDR_HOP) ||
+ (nexthdr == NEXTHDR_ROUTING) ||
+ (nexthdr == NEXTHDR_FRAGMENT) ||
+ (nexthdr == NEXTHDR_AUTH) ||
+ (nexthdr == NEXTHDR_NONE) ||
+ (nexthdr == NEXTHDR_DEST);
+}
+EXPORT_SYMBOL(ipv6_ext_hdr);
+
+/*
+ * Skip any extension headers. This is used by the ICMP module.
+ *
+ * Note that strictly speaking this conflicts with RFC 2460 4.0:
+ * ...The contents and semantics of each extension header determine whether
+ * or not to proceed to the next header. Therefore, extension headers must
+ * be processed strictly in the order they appear in the packet; a
+ * receiver must not, for example, scan through a packet looking for a
+ * particular kind of extension header and process that header prior to
+ * processing all preceding ones.
+ *
+ * We do exactly this. This is a protocol bug. We can't decide after a
+ * seeing an unknown discard-with-error flavour TLV option if it's a
+ * ICMP error message or not (errors should never be send in reply to
+ * ICMP error messages).
+ *
+ * But I see no other way to do this. This might need to be reexamined
+ * when Linux implements ESP (and maybe AUTH) headers.
+ * --AK
+ *
+ * This function parses (probably truncated) exthdr set "hdr".
+ * "nexthdrp" initially points to some place,
+ * where type of the first header can be found.
+ *
+ * It skips all well-known exthdrs, and returns pointer to the start
+ * of unparsable area i.e. the first header with unknown type.
+ * If it is not NULL *nexthdr is updated by type/protocol of this header.
+ *
+ * NOTES: - if packet terminated with NEXTHDR_NONE it returns NULL.
+ * - it may return pointer pointing beyond end of packet,
+ * if the last recognized header is truncated in the middle.
+ * - if packet is truncated, so that all parsed headers are skipped,
+ * it returns NULL.
+ * - First fragment header is skipped, not-first ones
+ * are considered as unparsable.
+ * - Reports the offset field of the final fragment header so it is
+ * possible to tell whether this is a first fragment, later fragment,
+ * or not fragmented.
+ * - ESP is unparsable for now and considered like
+ * normal payload protocol.
+ * - Note also special handling of AUTH header. Thanks to IPsec wizards.
+ *
+ * --ANK (980726)
+ */
+
+int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp,
+ __be16 *frag_offp)
+{
+ u8 nexthdr = *nexthdrp;
+
+ *frag_offp = 0;
+
+ while (ipv6_ext_hdr(nexthdr)) {
+ struct ipv6_opt_hdr _hdr, *hp;
+ int hdrlen;
+
+ if (nexthdr == NEXTHDR_NONE)
+ return -1;
+ hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
+ if (!hp)
+ return -1;
+ if (nexthdr == NEXTHDR_FRAGMENT) {
+ __be16 _frag_off, *fp;
+ fp = skb_header_pointer(skb,
+ start+offsetof(struct frag_hdr,
+ frag_off),
+ sizeof(_frag_off),
+ &_frag_off);
+ if (!fp)
+ return -1;
+
+ *frag_offp = *fp;
+ if (ntohs(*frag_offp) & ~0x7)
+ break;
+ hdrlen = 8;
+ } else if (nexthdr == NEXTHDR_AUTH)
+ hdrlen = ipv6_authlen(hp);
+ else
+ hdrlen = ipv6_optlen(hp);
+
+ nexthdr = hp->nexthdr;
+ start += hdrlen;
+ }
+
+ *nexthdrp = nexthdr;
+ return start;
+}
+EXPORT_SYMBOL(ipv6_skip_exthdr);
+
+int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type)
+{
+ const unsigned char *nh = skb_network_header(skb);
+ int packet_len = skb_tail_pointer(skb) - skb_network_header(skb);
+ struct ipv6_opt_hdr *hdr;
+ int len;
+
+ if (offset + 2 > packet_len)
+ goto bad;
+ hdr = (struct ipv6_opt_hdr *)(nh + offset);
+ len = ((hdr->hdrlen + 1) << 3);
+
+ if (offset + len > packet_len)
+ goto bad;
+
+ offset += 2;
+ len -= 2;
+
+ while (len > 0) {
+ int opttype = nh[offset];
+ int optlen;
+
+ if (opttype == type)
+ return offset;
+
+ switch (opttype) {
+ case IPV6_TLV_PAD1:
+ optlen = 1;
+ break;
+ default:
+ optlen = nh[offset + 1] + 2;
+ if (optlen > len)
+ goto bad;
+ break;
+ }
+ offset += optlen;
+ len -= optlen;
+ }
+ /* not_found */
+ bad:
+ return -1;
+}
+EXPORT_SYMBOL_GPL(ipv6_find_tlv);
+
+/*
+ * find the offset to specified header or the protocol number of last header
+ * if target < 0. "last header" is transport protocol header, ESP, or
+ * "No next header".
+ *
+ * Note that *offset is used as input/output parameter, and if it is not zero,
+ * then it must be a valid offset to an inner IPv6 header. This can be used
+ * to explore inner IPv6 header, eg. ICMPv6 error messages.
+ *
+ * If target header is found, its offset is set in *offset and return protocol
+ * number. Otherwise, return -1.
+ *
+ * If the first fragment doesn't contain the final protocol header or
+ * NEXTHDR_NONE it is considered invalid.
+ *
+ * Note that non-1st fragment is special case that "the protocol number
+ * of last header" is "next header" field in Fragment header. In this case,
+ * *offset is meaningless and fragment offset is stored in *fragoff if fragoff
+ * isn't NULL.
+ *
+ * if flags is not NULL and it's a fragment, then the frag flag
+ * IP6_FH_F_FRAG will be set. If it's an AH header, the
+ * IP6_FH_F_AUTH flag is set and target < 0, then this function will
+ * stop at the AH header. If IP6_FH_F_SKIP_RH flag was passed, then this
+ * function will skip all those routing headers, where segements_left was 0.
+ */
+int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
+ int target, unsigned short *fragoff, int *flags)
+{
+ unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr);
+ u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+ bool found;
+
+ if (fragoff)
+ *fragoff = 0;
+
+ if (*offset) {
+ struct ipv6hdr _ip6, *ip6;
+
+ ip6 = skb_header_pointer(skb, *offset, sizeof(_ip6), &_ip6);
+ if (!ip6 || (ip6->version != 6)) {
+ printk(KERN_ERR "IPv6 header not found\n");
+ return -EBADMSG;
+ }
+ start = *offset + sizeof(struct ipv6hdr);
+ nexthdr = ip6->nexthdr;
+ }
+
+ do {
+ struct ipv6_opt_hdr _hdr, *hp;
+ unsigned int hdrlen;
+ found = (nexthdr == target);
+
+ if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) {
+ if (target < 0 || found)
+ break;
+ return -ENOENT;
+ }
+
+ hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
+ if (!hp)
+ return -EBADMSG;
+
+ if (nexthdr == NEXTHDR_ROUTING) {
+ struct ipv6_rt_hdr _rh, *rh;
+
+ rh = skb_header_pointer(skb, start, sizeof(_rh),
+ &_rh);
+ if (!rh)
+ return -EBADMSG;
+
+ if (flags && (*flags & IP6_FH_F_SKIP_RH) &&
+ rh->segments_left == 0)
+ found = false;
+ }
+
+ if (nexthdr == NEXTHDR_FRAGMENT) {
+ unsigned short _frag_off;
+ __be16 *fp;
+
+ if (flags) /* Indicate that this is a fragment */
+ *flags |= IP6_FH_F_FRAG;
+ fp = skb_header_pointer(skb,
+ start+offsetof(struct frag_hdr,
+ frag_off),
+ sizeof(_frag_off),
+ &_frag_off);
+ if (!fp)
+ return -EBADMSG;
+
+ _frag_off = ntohs(*fp) & ~0x7;
+ if (_frag_off) {
+ if (target < 0 &&
+ ((!ipv6_ext_hdr(hp->nexthdr)) ||
+ hp->nexthdr == NEXTHDR_NONE)) {
+ if (fragoff)
+ *fragoff = _frag_off;
+ return hp->nexthdr;
+ }
+ if (!found)
+ return -ENOENT;
+ if (fragoff)
+ *fragoff = _frag_off;
+ break;
+ }
+ hdrlen = 8;
+ } else if (nexthdr == NEXTHDR_AUTH) {
+ if (flags && (*flags & IP6_FH_F_AUTH) && (target < 0))
+ break;
+ hdrlen = (hp->hdrlen + 2) << 2;
+ } else
+ hdrlen = ipv6_optlen(hp);
+
+ if (!found) {
+ nexthdr = hp->nexthdr;
+ start += hdrlen;
+ }
+ } while (!found);
+
+ *offset = start;
+ return nexthdr;
+}
+EXPORT_SYMBOL(ipv6_find_hdr);
diff --git a/net/ipv6/exthdrs_offload.c b/net/ipv6/exthdrs_offload.c
new file mode 100644
index 0000000..f5e2ba1
--- /dev/null
+++ b/net/ipv6/exthdrs_offload.c
@@ -0,0 +1,41 @@
+/*
+ * IPV6 GSO/GRO offload support
+ * Linux INET6 implementation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * IPV6 Extension Header GSO/GRO support
+ */
+#include <net/protocol.h>
+#include "ip6_offload.h"
+
+static const struct net_offload rthdr_offload = {
+ .flags = INET6_PROTO_GSO_EXTHDR,
+};
+
+static const struct net_offload dstopt_offload = {
+ .flags = INET6_PROTO_GSO_EXTHDR,
+};
+
+int __init ipv6_exthdrs_offload_init(void)
+{
+ int ret;
+
+ ret = inet6_add_offload(&rthdr_offload, IPPROTO_ROUTING);
+ if (ret)
+ goto out;
+
+ ret = inet6_add_offload(&dstopt_offload, IPPROTO_DSTOPTS);
+ if (ret)
+ goto out_rt;
+
+out:
+ return ret;
+
+out_rt:
+ inet6_del_offload(&rthdr_offload, IPPROTO_ROUTING);
+ goto out;
+}
diff --git a/net/ipv6/fib6_notifier.c b/net/ipv6/fib6_notifier.c
new file mode 100644
index 0000000..05f82ba
--- /dev/null
+++ b/net/ipv6/fib6_notifier.c
@@ -0,0 +1,63 @@
+#include <linux/notifier.h>
+#include <linux/socket.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <net/net_namespace.h>
+#include <net/fib_notifier.h>
+#include <net/netns/ipv6.h>
+#include <net/ip6_fib.h>
+
+int call_fib6_notifier(struct notifier_block *nb, struct net *net,
+ enum fib_event_type event_type,
+ struct fib_notifier_info *info)
+{
+ info->family = AF_INET6;
+ return call_fib_notifier(nb, net, event_type, info);
+}
+
+int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
+ struct fib_notifier_info *info)
+{
+ info->family = AF_INET6;
+ return call_fib_notifiers(net, event_type, info);
+}
+
+static unsigned int fib6_seq_read(struct net *net)
+{
+ return fib6_tables_seq_read(net) + fib6_rules_seq_read(net);
+}
+
+static int fib6_dump(struct net *net, struct notifier_block *nb)
+{
+ int err;
+
+ err = fib6_rules_dump(net, nb);
+ if (err)
+ return err;
+
+ return fib6_tables_dump(net, nb);
+}
+
+static const struct fib_notifier_ops fib6_notifier_ops_template = {
+ .family = AF_INET6,
+ .fib_seq_read = fib6_seq_read,
+ .fib_dump = fib6_dump,
+ .owner = THIS_MODULE,
+};
+
+int __net_init fib6_notifier_init(struct net *net)
+{
+ struct fib_notifier_ops *ops;
+
+ ops = fib_notifier_ops_register(&fib6_notifier_ops_template, net);
+ if (IS_ERR(ops))
+ return PTR_ERR(ops);
+ net->ipv6.notifier_ops = ops;
+
+ return 0;
+}
+
+void __net_exit fib6_notifier_exit(struct net *net)
+{
+ fib_notifier_ops_unregister(net->ipv6.notifier_ops);
+}
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
new file mode 100644
index 0000000..f590446
--- /dev/null
+++ b/net/ipv6/fib6_rules.c
@@ -0,0 +1,506 @@
+/*
+ * net/ipv6/fib6_rules.c IPv6 Routing Policy Rules
+ *
+ * Copyright (C)2003-2006 Helsinki University of Technology
+ * Copyright (C)2003-2006 USAGI/WIDE Project
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2.
+ *
+ * Authors
+ * Thomas Graf <tgraf@suug.ch>
+ * Ville Nuorvala <vnuorval@tcs.hut.fi>
+ */
+
+#include <linux/netdevice.h>
+#include <linux/notifier.h>
+#include <linux/export.h>
+
+#include <net/fib_rules.h>
+#include <net/ipv6.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+#include <net/netlink.h>
+
+struct fib6_rule {
+ struct fib_rule common;
+ struct rt6key src;
+ struct rt6key dst;
+ u8 tclass;
+};
+
+static bool fib6_rule_matchall(const struct fib_rule *rule)
+{
+ struct fib6_rule *r = container_of(rule, struct fib6_rule, common);
+
+ if (r->dst.plen || r->src.plen || r->tclass)
+ return false;
+ return fib_rule_matchall(rule);
+}
+
+bool fib6_rule_default(const struct fib_rule *rule)
+{
+ if (!fib6_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL ||
+ rule->l3mdev)
+ return false;
+ if (rule->table != RT6_TABLE_LOCAL && rule->table != RT6_TABLE_MAIN)
+ return false;
+ return true;
+}
+EXPORT_SYMBOL_GPL(fib6_rule_default);
+
+int fib6_rules_dump(struct net *net, struct notifier_block *nb)
+{
+ return fib_rules_dump(net, nb, AF_INET6);
+}
+
+unsigned int fib6_rules_seq_read(struct net *net)
+{
+ return fib_rules_seq_read(net, AF_INET6);
+}
+
+/* called with rcu lock held; no reference taken on fib6_info */
+struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
+ int flags)
+{
+ struct fib6_info *f6i;
+ int err;
+
+ if (net->ipv6.fib6_has_custom_rules) {
+ struct fib_lookup_arg arg = {
+ .lookup_ptr = fib6_table_lookup,
+ .lookup_data = &oif,
+ .flags = FIB_LOOKUP_NOREF,
+ };
+
+ l3mdev_update_flow(net, flowi6_to_flowi(fl6));
+
+ err = fib_rules_lookup(net->ipv6.fib6_rules_ops,
+ flowi6_to_flowi(fl6), flags, &arg);
+ if (err)
+ return ERR_PTR(err);
+
+ f6i = arg.result ? : net->ipv6.fib6_null_entry;
+ } else {
+ f6i = fib6_table_lookup(net, net->ipv6.fib6_local_tbl,
+ oif, fl6, flags);
+ if (!f6i || f6i == net->ipv6.fib6_null_entry)
+ f6i = fib6_table_lookup(net, net->ipv6.fib6_main_tbl,
+ oif, fl6, flags);
+ }
+
+ return f6i;
+}
+
+struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
+ const struct sk_buff *skb,
+ int flags, pol_lookup_t lookup)
+{
+ if (net->ipv6.fib6_has_custom_rules) {
+ struct fib_lookup_arg arg = {
+ .lookup_ptr = lookup,
+ .lookup_data = skb,
+ .flags = FIB_LOOKUP_NOREF,
+ };
+
+ /* update flow if oif or iif point to device enslaved to l3mdev */
+ l3mdev_update_flow(net, flowi6_to_flowi(fl6));
+
+ fib_rules_lookup(net->ipv6.fib6_rules_ops,
+ flowi6_to_flowi(fl6), flags, &arg);
+
+ if (arg.result)
+ return arg.result;
+ } else {
+ struct rt6_info *rt;
+
+ rt = lookup(net, net->ipv6.fib6_local_tbl, fl6, skb, flags);
+ if (rt != net->ipv6.ip6_null_entry && rt->dst.error != -EAGAIN)
+ return &rt->dst;
+ ip6_rt_put(rt);
+ rt = lookup(net, net->ipv6.fib6_main_tbl, fl6, skb, flags);
+ if (rt->dst.error != -EAGAIN)
+ return &rt->dst;
+ ip6_rt_put(rt);
+ }
+
+ dst_hold(&net->ipv6.ip6_null_entry->dst);
+ return &net->ipv6.ip6_null_entry->dst;
+}
+
+static int fib6_rule_saddr(struct net *net, struct fib_rule *rule, int flags,
+ struct flowi6 *flp6, const struct net_device *dev)
+{
+ struct fib6_rule *r = (struct fib6_rule *)rule;
+
+ /* If we need to find a source address for this traffic,
+ * we check the result if it meets requirement of the rule.
+ */
+ if ((rule->flags & FIB_RULE_FIND_SADDR) &&
+ r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
+ struct in6_addr saddr;
+
+ if (ipv6_dev_get_saddr(net, dev, &flp6->daddr,
+ rt6_flags2srcprefs(flags), &saddr))
+ return -EAGAIN;
+
+ if (!ipv6_prefix_equal(&saddr, &r->src.addr, r->src.plen))
+ return -EAGAIN;
+
+ flp6->saddr = saddr;
+ }
+
+ return 0;
+}
+
+static int fib6_rule_action_alt(struct fib_rule *rule, struct flowi *flp,
+ int flags, struct fib_lookup_arg *arg)
+{
+ struct flowi6 *flp6 = &flp->u.ip6;
+ struct net *net = rule->fr_net;
+ struct fib6_table *table;
+ struct fib6_info *f6i;
+ int err = -EAGAIN, *oif;
+ u32 tb_id;
+
+ switch (rule->action) {
+ case FR_ACT_TO_TBL:
+ break;
+ case FR_ACT_UNREACHABLE:
+ return -ENETUNREACH;
+ case FR_ACT_PROHIBIT:
+ return -EACCES;
+ case FR_ACT_BLACKHOLE:
+ default:
+ return -EINVAL;
+ }
+
+ tb_id = fib_rule_get_table(rule, arg);
+ table = fib6_get_table(net, tb_id);
+ if (!table)
+ return -EAGAIN;
+
+ oif = (int *)arg->lookup_data;
+ f6i = fib6_table_lookup(net, table, *oif, flp6, flags);
+ if (f6i != net->ipv6.fib6_null_entry) {
+ err = fib6_rule_saddr(net, rule, flags, flp6,
+ fib6_info_nh_dev(f6i));
+
+ if (likely(!err))
+ arg->result = f6i;
+ }
+
+ return err;
+}
+
+static int __fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
+ int flags, struct fib_lookup_arg *arg)
+{
+ struct flowi6 *flp6 = &flp->u.ip6;
+ struct rt6_info *rt = NULL;
+ struct fib6_table *table;
+ struct net *net = rule->fr_net;
+ pol_lookup_t lookup = arg->lookup_ptr;
+ int err = 0;
+ u32 tb_id;
+
+ switch (rule->action) {
+ case FR_ACT_TO_TBL:
+ break;
+ case FR_ACT_UNREACHABLE:
+ err = -ENETUNREACH;
+ rt = net->ipv6.ip6_null_entry;
+ goto discard_pkt;
+ default:
+ case FR_ACT_BLACKHOLE:
+ err = -EINVAL;
+ rt = net->ipv6.ip6_blk_hole_entry;
+ goto discard_pkt;
+ case FR_ACT_PROHIBIT:
+ err = -EACCES;
+ rt = net->ipv6.ip6_prohibit_entry;
+ goto discard_pkt;
+ }
+
+ tb_id = fib_rule_get_table(rule, arg);
+ table = fib6_get_table(net, tb_id);
+ if (!table) {
+ err = -EAGAIN;
+ goto out;
+ }
+
+ rt = lookup(net, table, flp6, arg->lookup_data, flags);
+ if (rt != net->ipv6.ip6_null_entry) {
+ err = fib6_rule_saddr(net, rule, flags, flp6,
+ ip6_dst_idev(&rt->dst)->dev);
+
+ if (err == -EAGAIN)
+ goto again;
+
+ err = rt->dst.error;
+ if (err != -EAGAIN)
+ goto out;
+ }
+again:
+ ip6_rt_put(rt);
+ err = -EAGAIN;
+ rt = NULL;
+ goto out;
+
+discard_pkt:
+ dst_hold(&rt->dst);
+out:
+ arg->result = rt;
+ return err;
+}
+
+static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
+ int flags, struct fib_lookup_arg *arg)
+{
+ if (arg->lookup_ptr == fib6_table_lookup)
+ return fib6_rule_action_alt(rule, flp, flags, arg);
+
+ return __fib6_rule_action(rule, flp, flags, arg);
+}
+
+static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
+{
+ struct rt6_info *rt = (struct rt6_info *) arg->result;
+ struct net_device *dev = NULL;
+
+ if (rt->rt6i_idev)
+ dev = rt->rt6i_idev->dev;
+
+ /* do not accept result if the route does
+ * not meet the required prefix length
+ */
+ if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
+ goto suppress_route;
+
+ /* do not accept result if the route uses a device
+ * belonging to a forbidden interface group
+ */
+ if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
+ goto suppress_route;
+
+ return false;
+
+suppress_route:
+ ip6_rt_put(rt);
+ return true;
+}
+
+static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
+{
+ struct fib6_rule *r = (struct fib6_rule *) rule;
+ struct flowi6 *fl6 = &fl->u.ip6;
+
+ if (r->dst.plen &&
+ !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
+ return 0;
+
+ /*
+ * If FIB_RULE_FIND_SADDR is set and we do not have a
+ * source address for the traffic, we defer check for
+ * source address.
+ */
+ if (r->src.plen) {
+ if (flags & RT6_LOOKUP_F_HAS_SADDR) {
+ if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
+ r->src.plen))
+ return 0;
+ } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
+ return 0;
+ }
+
+ if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
+ return 0;
+
+ if (rule->ip_proto && (rule->ip_proto != fl6->flowi6_proto))
+ return 0;
+
+ if (fib_rule_port_range_set(&rule->sport_range) &&
+ !fib_rule_port_inrange(&rule->sport_range, fl6->fl6_sport))
+ return 0;
+
+ if (fib_rule_port_range_set(&rule->dport_range) &&
+ !fib_rule_port_inrange(&rule->dport_range, fl6->fl6_dport))
+ return 0;
+
+ return 1;
+}
+
+static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
+ FRA_GENERIC_POLICY,
+};
+
+static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
+ struct fib_rule_hdr *frh,
+ struct nlattr **tb,
+ struct netlink_ext_ack *extack)
+{
+ int err = -EINVAL;
+ struct net *net = sock_net(skb->sk);
+ struct fib6_rule *rule6 = (struct fib6_rule *) rule;
+
+ if (rule->action == FR_ACT_TO_TBL && !rule->l3mdev) {
+ if (rule->table == RT6_TABLE_UNSPEC) {
+ NL_SET_ERR_MSG(extack, "Invalid table");
+ goto errout;
+ }
+
+ if (fib6_new_table(net, rule->table) == NULL) {
+ err = -ENOBUFS;
+ goto errout;
+ }
+ }
+
+ if (frh->src_len)
+ rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);
+
+ if (frh->dst_len)
+ rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);
+
+ rule6->src.plen = frh->src_len;
+ rule6->dst.plen = frh->dst_len;
+ rule6->tclass = frh->tos;
+
+ if (fib_rule_requires_fldissect(rule))
+ net->ipv6.fib6_rules_require_fldissect++;
+
+ net->ipv6.fib6_has_custom_rules = true;
+ err = 0;
+errout:
+ return err;
+}
+
+static int fib6_rule_delete(struct fib_rule *rule)
+{
+ struct net *net = rule->fr_net;
+
+ if (net->ipv6.fib6_rules_require_fldissect &&
+ fib_rule_requires_fldissect(rule))
+ net->ipv6.fib6_rules_require_fldissect--;
+
+ return 0;
+}
+
+static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
+ struct nlattr **tb)
+{
+ struct fib6_rule *rule6 = (struct fib6_rule *) rule;
+
+ if (frh->src_len && (rule6->src.plen != frh->src_len))
+ return 0;
+
+ if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
+ return 0;
+
+ if (frh->tos && (rule6->tclass != frh->tos))
+ return 0;
+
+ if (frh->src_len &&
+ nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
+ return 0;
+
+ if (frh->dst_len &&
+ nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
+ return 0;
+
+ return 1;
+}
+
+static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
+ struct fib_rule_hdr *frh)
+{
+ struct fib6_rule *rule6 = (struct fib6_rule *) rule;
+
+ frh->dst_len = rule6->dst.plen;
+ frh->src_len = rule6->src.plen;
+ frh->tos = rule6->tclass;
+
+ if ((rule6->dst.plen &&
+ nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) ||
+ (rule6->src.plen &&
+ nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return -ENOBUFS;
+}
+
+static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
+{
+ return nla_total_size(16) /* dst */
+ + nla_total_size(16); /* src */
+}
+
+static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
+ .family = AF_INET6,
+ .rule_size = sizeof(struct fib6_rule),
+ .addr_size = sizeof(struct in6_addr),
+ .action = fib6_rule_action,
+ .match = fib6_rule_match,
+ .suppress = fib6_rule_suppress,
+ .configure = fib6_rule_configure,
+ .delete = fib6_rule_delete,
+ .compare = fib6_rule_compare,
+ .fill = fib6_rule_fill,
+ .nlmsg_payload = fib6_rule_nlmsg_payload,
+ .nlgroup = RTNLGRP_IPV6_RULE,
+ .policy = fib6_rule_policy,
+ .owner = THIS_MODULE,
+ .fro_net = &init_net,
+};
+
+static int __net_init fib6_rules_net_init(struct net *net)
+{
+ struct fib_rules_ops *ops;
+ int err = -ENOMEM;
+
+ ops = fib_rules_register(&fib6_rules_ops_template, net);
+ if (IS_ERR(ops))
+ return PTR_ERR(ops);
+
+ err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
+ if (err)
+ goto out_fib6_rules_ops;
+
+ err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
+ if (err)
+ goto out_fib6_rules_ops;
+
+ net->ipv6.fib6_rules_ops = ops;
+ net->ipv6.fib6_rules_require_fldissect = 0;
+out:
+ return err;
+
+out_fib6_rules_ops:
+ fib_rules_unregister(ops);
+ goto out;
+}
+
+static void __net_exit fib6_rules_net_exit(struct net *net)
+{
+ rtnl_lock();
+ fib_rules_unregister(net->ipv6.fib6_rules_ops);
+ rtnl_unlock();
+}
+
+static struct pernet_operations fib6_rules_net_ops = {
+ .init = fib6_rules_net_init,
+ .exit = fib6_rules_net_exit,
+};
+
+int __init fib6_rules_init(void)
+{
+ return register_pernet_subsys(&fib6_rules_net_ops);
+}
+
+
+void fib6_rules_cleanup(void)
+{
+ unregister_pernet_subsys(&fib6_rules_net_ops);
+}
diff --git a/net/ipv6/fou6.c b/net/ipv6/fou6.c
new file mode 100644
index 0000000..6de3c04
--- /dev/null
+++ b/net/ipv6/fou6.c
@@ -0,0 +1,138 @@
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <net/fou.h>
+#include <net/ip.h>
+#include <net/ip6_tunnel.h>
+#include <net/ip6_checksum.h>
+#include <net/protocol.h>
+#include <net/udp.h>
+#include <net/udp_tunnel.h>
+
+#if IS_ENABLED(CONFIG_IPV6_FOU_TUNNEL)
+
+static void fou6_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
+ struct flowi6 *fl6, u8 *protocol, __be16 sport)
+{
+ struct udphdr *uh;
+
+ skb_push(skb, sizeof(struct udphdr));
+ skb_reset_transport_header(skb);
+
+ uh = udp_hdr(skb);
+
+ uh->dest = e->dport;
+ uh->source = sport;
+ uh->len = htons(skb->len);
+ udp6_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM6), skb,
+ &fl6->saddr, &fl6->daddr, skb->len);
+
+ *protocol = IPPROTO_UDP;
+}
+
+static int fou6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
+ u8 *protocol, struct flowi6 *fl6)
+{
+ __be16 sport;
+ int err;
+ int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
+ SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
+
+ err = __fou_build_header(skb, e, protocol, &sport, type);
+ if (err)
+ return err;
+
+ fou6_build_udp(skb, e, fl6, protocol, sport);
+
+ return 0;
+}
+
+static int gue6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
+ u8 *protocol, struct flowi6 *fl6)
+{
+ __be16 sport;
+ int err;
+ int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
+ SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
+
+ err = __gue_build_header(skb, e, protocol, &sport, type);
+ if (err)
+ return err;
+
+ fou6_build_udp(skb, e, fl6, protocol, sport);
+
+ return 0;
+}
+
+static const struct ip6_tnl_encap_ops fou_ip6tun_ops = {
+ .encap_hlen = fou_encap_hlen,
+ .build_header = fou6_build_header,
+};
+
+static const struct ip6_tnl_encap_ops gue_ip6tun_ops = {
+ .encap_hlen = gue_encap_hlen,
+ .build_header = gue6_build_header,
+};
+
+static int ip6_tnl_encap_add_fou_ops(void)
+{
+ int ret;
+
+ ret = ip6_tnl_encap_add_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
+ if (ret < 0) {
+ pr_err("can't add fou6 ops\n");
+ return ret;
+ }
+
+ ret = ip6_tnl_encap_add_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
+ if (ret < 0) {
+ pr_err("can't add gue6 ops\n");
+ ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void ip6_tnl_encap_del_fou_ops(void)
+{
+ ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
+ ip6_tnl_encap_del_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
+}
+
+#else
+
+static int ip6_tnl_encap_add_fou_ops(void)
+{
+ return 0;
+}
+
+static void ip6_tnl_encap_del_fou_ops(void)
+{
+}
+
+#endif
+
+static int __init fou6_init(void)
+{
+ int ret;
+
+ ret = ip6_tnl_encap_add_fou_ops();
+
+ return ret;
+}
+
+static void __exit fou6_fini(void)
+{
+ ip6_tnl_encap_del_fou_ops();
+}
+
+module_init(fou6_init);
+module_exit(fou6_fini);
+MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
new file mode 100644
index 0000000..c9c53ad
--- /dev/null
+++ b/net/ipv6/icmp.c
@@ -0,0 +1,1133 @@
+/*
+ * Internet Control Message Protocol (ICMPv6)
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Based on net/ipv4/icmp.c
+ *
+ * RFC 1885
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * Changes:
+ *
+ * Andi Kleen : exception handling
+ * Andi Kleen add rate limits. never reply to a icmp.
+ * add more length checks and other fixes.
+ * yoshfuji : ensure to sent parameter problem for
+ * fragments.
+ * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit.
+ * Randy Dunlap and
+ * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support
+ * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/netfilter.h>
+#include <linux/slab.h>
+
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/icmpv6.h>
+
+#include <net/ip.h>
+#include <net/sock.h>
+
+#include <net/ipv6.h>
+#include <net/ip6_checksum.h>
+#include <net/ping.h>
+#include <net/protocol.h>
+#include <net/raw.h>
+#include <net/rawv6.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/icmp.h>
+#include <net/xfrm.h>
+#include <net/inet_common.h>
+#include <net/dsfield.h>
+#include <net/l3mdev.h>
+
+#include <linux/uaccess.h>
+
+/*
+ * The ICMP socket(s). This is the most convenient way to flow control
+ * our ICMP output as well as maintain a clean interface throughout
+ * all layers. All Socketless IP sends will soon be gone.
+ *
+ * On SMP we have one ICMP socket per-cpu.
+ */
+static inline struct sock *icmpv6_sk(struct net *net)
+{
+ return net->ipv6.icmp_sk[smp_processor_id()];
+}
+
+static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */
+ struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset);
+ struct net *net = dev_net(skb->dev);
+
+ if (type == ICMPV6_PKT_TOOBIG)
+ ip6_update_pmtu(skb, net, info, skb->dev->ifindex, 0, sock_net_uid(net, NULL));
+ else if (type == NDISC_REDIRECT)
+ ip6_redirect(skb, net, skb->dev->ifindex, 0,
+ sock_net_uid(net, NULL));
+
+ if (!(type & ICMPV6_INFOMSG_MASK))
+ if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST)
+ ping_err(skb, offset, ntohl(info));
+}
+
+static int icmpv6_rcv(struct sk_buff *skb);
+
+static const struct inet6_protocol icmpv6_protocol = {
+ .handler = icmpv6_rcv,
+ .err_handler = icmpv6_err,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+/* Called with BH disabled */
+static __inline__ struct sock *icmpv6_xmit_lock(struct net *net)
+{
+ struct sock *sk;
+
+ sk = icmpv6_sk(net);
+ if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
+ /* This can happen if the output path (f.e. SIT or
+ * ip6ip6 tunnel) signals dst_link_failure() for an
+ * outgoing ICMP6 packet.
+ */
+ return NULL;
+ }
+ return sk;
+}
+
+static __inline__ void icmpv6_xmit_unlock(struct sock *sk)
+{
+ spin_unlock(&sk->sk_lock.slock);
+}
+
+/*
+ * Figure out, may we reply to this packet with icmp error.
+ *
+ * We do not reply, if:
+ * - it was icmp error message.
+ * - it is truncated, so that it is known, that protocol is ICMPV6
+ * (i.e. in the middle of some exthdr)
+ *
+ * --ANK (980726)
+ */
+
+static bool is_ineligible(const struct sk_buff *skb)
+{
+ int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
+ int len = skb->len - ptr;
+ __u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+ __be16 frag_off;
+
+ if (len < 0)
+ return true;
+
+ ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off);
+ if (ptr < 0)
+ return false;
+ if (nexthdr == IPPROTO_ICMPV6) {
+ u8 _type, *tp;
+ tp = skb_header_pointer(skb,
+ ptr+offsetof(struct icmp6hdr, icmp6_type),
+ sizeof(_type), &_type);
+ if (!tp || !(*tp & ICMPV6_INFOMSG_MASK))
+ return true;
+ }
+ return false;
+}
+
+static bool icmpv6_mask_allow(int type)
+{
+ /* Informational messages are not limited. */
+ if (type & ICMPV6_INFOMSG_MASK)
+ return true;
+
+ /* Do not limit pmtu discovery, it would break it. */
+ if (type == ICMPV6_PKT_TOOBIG)
+ return true;
+
+ return false;
+}
+
+static bool icmpv6_global_allow(int type)
+{
+ if (icmpv6_mask_allow(type))
+ return true;
+
+ if (icmp_global_allow())
+ return true;
+
+ return false;
+}
+
+/*
+ * Check the ICMP output rate limit
+ */
+static bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
+ struct flowi6 *fl6)
+{
+ struct net *net = sock_net(sk);
+ struct dst_entry *dst;
+ bool res = false;
+
+ if (icmpv6_mask_allow(type))
+ return true;
+
+ /*
+ * Look up the output route.
+ * XXX: perhaps the expire for routing entries cloned by
+ * this lookup should be more aggressive (not longer than timeout).
+ */
+ dst = ip6_route_output(net, sk, fl6);
+ if (dst->error) {
+ IP6_INC_STATS(net, ip6_dst_idev(dst),
+ IPSTATS_MIB_OUTNOROUTES);
+ } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
+ res = true;
+ } else {
+ struct rt6_info *rt = (struct rt6_info *)dst;
+ int tmo = net->ipv6.sysctl.icmpv6_time;
+ struct inet_peer *peer;
+
+ /* Give more bandwidth to wider prefixes. */
+ if (rt->rt6i_dst.plen < 128)
+ tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
+
+ peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1);
+ res = inet_peer_xrlim_allow(peer, tmo);
+ if (peer)
+ inet_putpeer(peer);
+ }
+ dst_release(dst);
+ return res;
+}
+
+/*
+ * an inline helper for the "simple" if statement below
+ * checks if parameter problem report is caused by an
+ * unrecognized IPv6 option that has the Option Type
+ * highest-order two bits set to 10
+ */
+
+static bool opt_unrec(struct sk_buff *skb, __u32 offset)
+{
+ u8 _optval, *op;
+
+ offset += skb_network_offset(skb);
+ op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
+ if (!op)
+ return true;
+ return (*op & 0xC0) == 0x80;
+}
+
+void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
+ struct icmp6hdr *thdr, int len)
+{
+ struct sk_buff *skb;
+ struct icmp6hdr *icmp6h;
+
+ skb = skb_peek(&sk->sk_write_queue);
+ if (!skb)
+ return;
+
+ icmp6h = icmp6_hdr(skb);
+ memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
+ icmp6h->icmp6_cksum = 0;
+
+ if (skb_queue_len(&sk->sk_write_queue) == 1) {
+ skb->csum = csum_partial(icmp6h,
+ sizeof(struct icmp6hdr), skb->csum);
+ icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
+ &fl6->daddr,
+ len, fl6->flowi6_proto,
+ skb->csum);
+ } else {
+ __wsum tmp_csum = 0;
+
+ skb_queue_walk(&sk->sk_write_queue, skb) {
+ tmp_csum = csum_add(tmp_csum, skb->csum);
+ }
+
+ tmp_csum = csum_partial(icmp6h,
+ sizeof(struct icmp6hdr), tmp_csum);
+ icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
+ &fl6->daddr,
+ len, fl6->flowi6_proto,
+ tmp_csum);
+ }
+ ip6_push_pending_frames(sk);
+}
+
+struct icmpv6_msg {
+ struct sk_buff *skb;
+ int offset;
+ uint8_t type;
+};
+
+static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
+{
+ struct icmpv6_msg *msg = (struct icmpv6_msg *) from;
+ struct sk_buff *org_skb = msg->skb;
+ __wsum csum = 0;
+
+ csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset,
+ to, len, csum);
+ skb->csum = csum_block_add(skb->csum, csum, odd);
+ if (!(msg->type & ICMPV6_INFOMSG_MASK))
+ nf_ct_attach(skb, org_skb);
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+static void mip6_addr_swap(struct sk_buff *skb)
+{
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct inet6_skb_parm *opt = IP6CB(skb);
+ struct ipv6_destopt_hao *hao;
+ struct in6_addr tmp;
+ int off;
+
+ if (opt->dsthao) {
+ off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
+ if (likely(off >= 0)) {
+ hao = (struct ipv6_destopt_hao *)
+ (skb_network_header(skb) + off);
+ tmp = iph->saddr;
+ iph->saddr = hao->addr;
+ hao->addr = tmp;
+ }
+ }
+}
+#else
+static inline void mip6_addr_swap(struct sk_buff *skb) {}
+#endif
+
+static struct dst_entry *icmpv6_route_lookup(struct net *net,
+ struct sk_buff *skb,
+ struct sock *sk,
+ struct flowi6 *fl6)
+{
+ struct dst_entry *dst, *dst2;
+ struct flowi6 fl2;
+ int err;
+
+ err = ip6_dst_lookup(net, sk, &dst, fl6);
+ if (err)
+ return ERR_PTR(err);
+
+ /*
+ * We won't send icmp if the destination is known
+ * anycast.
+ */
+ if (ipv6_anycast_destination(dst, &fl6->daddr)) {
+ net_dbg_ratelimited("icmp6_send: acast source\n");
+ dst_release(dst);
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* No need to clone since we're just using its address. */
+ dst2 = dst;
+
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0);
+ if (!IS_ERR(dst)) {
+ if (dst != dst2)
+ return dst;
+ } else {
+ if (PTR_ERR(dst) == -EPERM)
+ dst = NULL;
+ else
+ return dst;
+ }
+
+ err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6);
+ if (err)
+ goto relookup_failed;
+
+ err = ip6_dst_lookup(net, sk, &dst2, &fl2);
+ if (err)
+ goto relookup_failed;
+
+ dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP);
+ if (!IS_ERR(dst2)) {
+ dst_release(dst);
+ dst = dst2;
+ } else {
+ err = PTR_ERR(dst2);
+ if (err == -EPERM) {
+ dst_release(dst);
+ return dst2;
+ } else
+ goto relookup_failed;
+ }
+
+relookup_failed:
+ if (dst)
+ return dst;
+ return ERR_PTR(err);
+}
+
+static int icmp6_iif(const struct sk_buff *skb)
+{
+ int iif = skb->dev->ifindex;
+
+ /* for local traffic to local address, skb dev is the loopback
+ * device. Check if there is a dst attached to the skb and if so
+ * get the real device index. Same is needed for replies to a link
+ * local address on a device enslaved to an L3 master device
+ */
+ if (unlikely(iif == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) {
+ const struct rt6_info *rt6 = skb_rt6_info(skb);
+
+ if (rt6)
+ iif = rt6->rt6i_idev->dev->ifindex;
+ }
+
+ return iif;
+}
+
+/*
+ * Send an ICMP message in response to a packet in error
+ */
+static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
+ const struct in6_addr *force_saddr)
+{
+ struct net *net = dev_net(skb->dev);
+ struct inet6_dev *idev = NULL;
+ struct ipv6hdr *hdr = ipv6_hdr(skb);
+ struct sock *sk;
+ struct ipv6_pinfo *np;
+ const struct in6_addr *saddr = NULL;
+ struct dst_entry *dst;
+ struct icmp6hdr tmp_hdr;
+ struct flowi6 fl6;
+ struct icmpv6_msg msg;
+ struct ipcm6_cookie ipc6;
+ int iif = 0;
+ int addr_type = 0;
+ int len;
+ u32 mark = IP6_REPLY_MARK(net, skb->mark);
+
+ if ((u8 *)hdr < skb->head ||
+ (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb))
+ return;
+
+ /*
+ * Make sure we respect the rules
+ * i.e. RFC 1885 2.4(e)
+ * Rule (e.1) is enforced by not using icmp6_send
+ * in any code that processes icmp errors.
+ */
+ addr_type = ipv6_addr_type(&hdr->daddr);
+
+ if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) ||
+ ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr))
+ saddr = &hdr->daddr;
+
+ /*
+ * Dest addr check
+ */
+
+ if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) {
+ if (type != ICMPV6_PKT_TOOBIG &&
+ !(type == ICMPV6_PARAMPROB &&
+ code == ICMPV6_UNK_OPTION &&
+ (opt_unrec(skb, info))))
+ return;
+
+ saddr = NULL;
+ }
+
+ addr_type = ipv6_addr_type(&hdr->saddr);
+
+ /*
+ * Source addr check
+ */
+
+ if (__ipv6_addr_needs_scope_id(addr_type)) {
+ iif = icmp6_iif(skb);
+ } else {
+ dst = skb_dst(skb);
+ iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev);
+ }
+
+ /*
+ * Must not send error if the source does not uniquely
+ * identify a single node (RFC2463 Section 2.4).
+ * We check unspecified / multicast addresses here,
+ * and anycast addresses will be checked later.
+ */
+ if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
+ net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n",
+ &hdr->saddr, &hdr->daddr);
+ return;
+ }
+
+ /*
+ * Never answer to a ICMP packet.
+ */
+ if (is_ineligible(skb)) {
+ net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n",
+ &hdr->saddr, &hdr->daddr);
+ return;
+ }
+
+ /* Needed by both icmp_global_allow and icmpv6_xmit_lock */
+ local_bh_disable();
+
+ /* Check global sysctl_icmp_msgs_per_sec ratelimit */
+ if (!(skb->dev->flags&IFF_LOOPBACK) && !icmpv6_global_allow(type))
+ goto out_bh_enable;
+
+ mip6_addr_swap(skb);
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_ICMPV6;
+ fl6.daddr = hdr->saddr;
+ if (force_saddr)
+ saddr = force_saddr;
+ if (saddr)
+ fl6.saddr = *saddr;
+ fl6.flowi6_mark = mark;
+ fl6.flowi6_oif = iif;
+ fl6.fl6_icmp_type = type;
+ fl6.fl6_icmp_code = code;
+ fl6.flowi6_uid = sock_net_uid(net, NULL);
+ fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL);
+ security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
+
+ sk = icmpv6_xmit_lock(net);
+ if (!sk)
+ goto out_bh_enable;
+
+ sk->sk_mark = mark;
+ np = inet6_sk(sk);
+
+ if (!icmpv6_xrlim_allow(sk, type, &fl6))
+ goto out;
+
+ tmp_hdr.icmp6_type = type;
+ tmp_hdr.icmp6_code = code;
+ tmp_hdr.icmp6_cksum = 0;
+ tmp_hdr.icmp6_pointer = htonl(info);
+
+ if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
+ fl6.flowi6_oif = np->mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
+
+ ipcm6_init_sk(&ipc6, np);
+ fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
+
+ dst = icmpv6_route_lookup(net, skb, sk, &fl6);
+ if (IS_ERR(dst))
+ goto out;
+
+ ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
+
+ msg.skb = skb;
+ msg.offset = skb_network_offset(skb);
+ msg.type = type;
+
+ len = skb->len - msg.offset;
+ len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr));
+ if (len < 0) {
+ net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n",
+ &hdr->saddr, &hdr->daddr);
+ goto out_dst_release;
+ }
+
+ rcu_read_lock();
+ idev = __in6_dev_get(skb->dev);
+
+ if (ip6_append_data(sk, icmpv6_getfrag, &msg,
+ len + sizeof(struct icmp6hdr),
+ sizeof(struct icmp6hdr),
+ &ipc6, &fl6, (struct rt6_info *)dst,
+ MSG_DONTWAIT)) {
+ ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS);
+ ip6_flush_pending_frames(sk);
+ } else {
+ icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
+ len + sizeof(struct icmp6hdr));
+ }
+ rcu_read_unlock();
+out_dst_release:
+ dst_release(dst);
+out:
+ icmpv6_xmit_unlock(sk);
+out_bh_enable:
+ local_bh_enable();
+}
+
+/* Slightly more convenient version of icmp6_send.
+ */
+void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
+{
+ icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL);
+ kfree_skb(skb);
+}
+
+/* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
+ * if sufficient data bytes are available
+ * @nhs is the size of the tunnel header(s) :
+ * Either an IPv4 header for SIT encap
+ * an IPv4 header + GRE header for GRE encap
+ */
+int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type,
+ unsigned int data_len)
+{
+ struct in6_addr temp_saddr;
+ struct rt6_info *rt;
+ struct sk_buff *skb2;
+ u32 info = 0;
+
+ if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8))
+ return 1;
+
+ /* RFC 4884 (partial) support for ICMP extensions */
+ if (data_len < 128 || (data_len & 7) || skb->len < data_len)
+ data_len = 0;
+
+ skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC);
+
+ if (!skb2)
+ return 1;
+
+ skb_dst_drop(skb2);
+ skb_pull(skb2, nhs);
+ skb_reset_network_header(skb2);
+
+ rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0,
+ skb, 0);
+
+ if (rt && rt->dst.dev)
+ skb2->dev = rt->dst.dev;
+
+ ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr);
+
+ if (data_len) {
+ /* RFC 4884 (partial) support :
+ * insert 0 padding at the end, before the extensions
+ */
+ __skb_push(skb2, nhs);
+ skb_reset_network_header(skb2);
+ memmove(skb2->data, skb2->data + nhs, data_len - nhs);
+ memset(skb2->data + data_len - nhs, 0, nhs);
+ /* RFC 4884 4.5 : Length is measured in 64-bit words,
+ * and stored in reserved[0]
+ */
+ info = (data_len/8) << 24;
+ }
+ if (type == ICMP_TIME_EXCEEDED)
+ icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
+ info, &temp_saddr);
+ else
+ icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH,
+ info, &temp_saddr);
+ if (rt)
+ ip6_rt_put(rt);
+
+ kfree_skb(skb2);
+
+ return 0;
+}
+EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach);
+
+static void icmpv6_echo_reply(struct sk_buff *skb)
+{
+ struct net *net = dev_net(skb->dev);
+ struct sock *sk;
+ struct inet6_dev *idev;
+ struct ipv6_pinfo *np;
+ const struct in6_addr *saddr = NULL;
+ struct icmp6hdr *icmph = icmp6_hdr(skb);
+ struct icmp6hdr tmp_hdr;
+ struct flowi6 fl6;
+ struct icmpv6_msg msg;
+ struct dst_entry *dst;
+ struct ipcm6_cookie ipc6;
+ u32 mark = IP6_REPLY_MARK(net, skb->mark);
+
+ saddr = &ipv6_hdr(skb)->daddr;
+
+ if (!ipv6_unicast_destination(skb) &&
+ !(net->ipv6.sysctl.anycast_src_echo_reply &&
+ ipv6_anycast_destination(skb_dst(skb), saddr)))
+ saddr = NULL;
+
+ memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
+ tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_ICMPV6;
+ fl6.daddr = ipv6_hdr(skb)->saddr;
+ if (saddr)
+ fl6.saddr = *saddr;
+ fl6.flowi6_oif = icmp6_iif(skb);
+ fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY;
+ fl6.flowi6_mark = mark;
+ fl6.flowi6_uid = sock_net_uid(net, NULL);
+ security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
+
+ local_bh_disable();
+ sk = icmpv6_xmit_lock(net);
+ if (!sk)
+ goto out_bh_enable;
+ sk->sk_mark = mark;
+ np = inet6_sk(sk);
+
+ if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
+ fl6.flowi6_oif = np->mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
+
+ if (ip6_dst_lookup(net, sk, &dst, &fl6))
+ goto out;
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0);
+ if (IS_ERR(dst))
+ goto out;
+
+ idev = __in6_dev_get(skb->dev);
+
+ msg.skb = skb;
+ msg.offset = 0;
+ msg.type = ICMPV6_ECHO_REPLY;
+
+ ipcm6_init_sk(&ipc6, np);
+ ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
+ ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb));
+
+ if (ip6_append_data(sk, icmpv6_getfrag, &msg,
+ skb->len + sizeof(struct icmp6hdr),
+ sizeof(struct icmp6hdr), &ipc6, &fl6,
+ (struct rt6_info *)dst, MSG_DONTWAIT)) {
+ __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS);
+ ip6_flush_pending_frames(sk);
+ } else {
+ icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
+ skb->len + sizeof(struct icmp6hdr));
+ }
+ dst_release(dst);
+out:
+ icmpv6_xmit_unlock(sk);
+out_bh_enable:
+ local_bh_enable();
+}
+
+void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
+{
+ const struct inet6_protocol *ipprot;
+ int inner_offset;
+ __be16 frag_off;
+ u8 nexthdr;
+ struct net *net = dev_net(skb->dev);
+
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ goto out;
+
+ nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
+ if (ipv6_ext_hdr(nexthdr)) {
+ /* now skip over extension headers */
+ inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
+ &nexthdr, &frag_off);
+ if (inner_offset < 0)
+ goto out;
+ } else {
+ inner_offset = sizeof(struct ipv6hdr);
+ }
+
+ /* Checkin header including 8 bytes of inner protocol header. */
+ if (!pskb_may_pull(skb, inner_offset+8))
+ goto out;
+
+ /* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
+ Without this we will not able f.e. to make source routed
+ pmtu discovery.
+ Corresponding argument (opt) to notifiers is already added.
+ --ANK (980726)
+ */
+
+ ipprot = rcu_dereference(inet6_protos[nexthdr]);
+ if (ipprot && ipprot->err_handler)
+ ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
+
+ raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
+ return;
+
+out:
+ __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
+}
+
+/*
+ * Handle icmp messages
+ */
+
+static int icmpv6_rcv(struct sk_buff *skb)
+{
+ struct net *net = dev_net(skb->dev);
+ struct net_device *dev = skb->dev;
+ struct inet6_dev *idev = __in6_dev_get(dev);
+ const struct in6_addr *saddr, *daddr;
+ struct icmp6hdr *hdr;
+ u8 type;
+ bool success = false;
+
+ if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
+ struct sec_path *sp = skb_sec_path(skb);
+ int nh;
+
+ if (!(sp && sp->xvec[sp->len - 1]->props.flags &
+ XFRM_STATE_ICMP))
+ goto drop_no_count;
+
+ if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr)))
+ goto drop_no_count;
+
+ nh = skb_network_offset(skb);
+ skb_set_network_header(skb, sizeof(*hdr));
+
+ if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb))
+ goto drop_no_count;
+
+ skb_set_network_header(skb, nh);
+ }
+
+ __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS);
+
+ saddr = &ipv6_hdr(skb)->saddr;
+ daddr = &ipv6_hdr(skb)->daddr;
+
+ if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) {
+ net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n",
+ saddr, daddr);
+ goto csum_error;
+ }
+
+ if (!pskb_pull(skb, sizeof(*hdr)))
+ goto discard_it;
+
+ hdr = icmp6_hdr(skb);
+
+ type = hdr->icmp6_type;
+
+ ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type);
+
+ switch (type) {
+ case ICMPV6_ECHO_REQUEST:
+ if (!net->ipv6.sysctl.icmpv6_echo_ignore_all)
+ icmpv6_echo_reply(skb);
+ break;
+
+ case ICMPV6_ECHO_REPLY:
+ success = ping_rcv(skb);
+ break;
+
+ case ICMPV6_PKT_TOOBIG:
+ /* BUGGG_FUTURE: if packet contains rthdr, we cannot update
+ standard destination cache. Seems, only "advanced"
+ destination cache will allow to solve this problem
+ --ANK (980726)
+ */
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ goto discard_it;
+ hdr = icmp6_hdr(skb);
+
+ /* to notify */
+ /* fall through */
+ case ICMPV6_DEST_UNREACH:
+ case ICMPV6_TIME_EXCEED:
+ case ICMPV6_PARAMPROB:
+ icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
+ break;
+
+ case NDISC_ROUTER_SOLICITATION:
+ case NDISC_ROUTER_ADVERTISEMENT:
+ case NDISC_NEIGHBOUR_SOLICITATION:
+ case NDISC_NEIGHBOUR_ADVERTISEMENT:
+ case NDISC_REDIRECT:
+ ndisc_rcv(skb);
+ break;
+
+ case ICMPV6_MGM_QUERY:
+ igmp6_event_query(skb);
+ break;
+
+ case ICMPV6_MGM_REPORT:
+ igmp6_event_report(skb);
+ break;
+
+ case ICMPV6_MGM_REDUCTION:
+ case ICMPV6_NI_QUERY:
+ case ICMPV6_NI_REPLY:
+ case ICMPV6_MLD2_REPORT:
+ case ICMPV6_DHAAD_REQUEST:
+ case ICMPV6_DHAAD_REPLY:
+ case ICMPV6_MOBILE_PREFIX_SOL:
+ case ICMPV6_MOBILE_PREFIX_ADV:
+ break;
+
+ default:
+ /* informational */
+ if (type & ICMPV6_INFOMSG_MASK)
+ break;
+
+ net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n",
+ saddr, daddr);
+
+ /*
+ * error of unknown type.
+ * must pass to upper level
+ */
+
+ icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
+ }
+
+ /* until the v6 path can be better sorted assume failure and
+ * preserve the status quo behaviour for the rest of the paths to here
+ */
+ if (success)
+ consume_skb(skb);
+ else
+ kfree_skb(skb);
+
+ return 0;
+
+csum_error:
+ __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS);
+discard_it:
+ __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS);
+drop_no_count:
+ kfree_skb(skb);
+ return 0;
+}
+
+void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6,
+ u8 type,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ int oif)
+{
+ memset(fl6, 0, sizeof(*fl6));
+ fl6->saddr = *saddr;
+ fl6->daddr = *daddr;
+ fl6->flowi6_proto = IPPROTO_ICMPV6;
+ fl6->fl6_icmp_type = type;
+ fl6->fl6_icmp_code = 0;
+ fl6->flowi6_oif = oif;
+ security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
+}
+
+static int __net_init icmpv6_sk_init(struct net *net)
+{
+ struct sock *sk;
+ int err, i, j;
+
+ net->ipv6.icmp_sk =
+ kcalloc(nr_cpu_ids, sizeof(struct sock *), GFP_KERNEL);
+ if (!net->ipv6.icmp_sk)
+ return -ENOMEM;
+
+ for_each_possible_cpu(i) {
+ err = inet_ctl_sock_create(&sk, PF_INET6,
+ SOCK_RAW, IPPROTO_ICMPV6, net);
+ if (err < 0) {
+ pr_err("Failed to initialize the ICMP6 control socket (err %d)\n",
+ err);
+ goto fail;
+ }
+
+ net->ipv6.icmp_sk[i] = sk;
+
+ /* Enough space for 2 64K ICMP packets, including
+ * sk_buff struct overhead.
+ */
+ sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024);
+ }
+ return 0;
+
+ fail:
+ for (j = 0; j < i; j++)
+ inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]);
+ kfree(net->ipv6.icmp_sk);
+ return err;
+}
+
+static void __net_exit icmpv6_sk_exit(struct net *net)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]);
+ }
+ kfree(net->ipv6.icmp_sk);
+}
+
+static struct pernet_operations icmpv6_sk_ops = {
+ .init = icmpv6_sk_init,
+ .exit = icmpv6_sk_exit,
+};
+
+int __init icmpv6_init(void)
+{
+ int err;
+
+ err = register_pernet_subsys(&icmpv6_sk_ops);
+ if (err < 0)
+ return err;
+
+ err = -EAGAIN;
+ if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
+ goto fail;
+
+ err = inet6_register_icmp_sender(icmp6_send);
+ if (err)
+ goto sender_reg_err;
+ return 0;
+
+sender_reg_err:
+ inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
+fail:
+ pr_err("Failed to register ICMP6 protocol\n");
+ unregister_pernet_subsys(&icmpv6_sk_ops);
+ return err;
+}
+
+void icmpv6_cleanup(void)
+{
+ inet6_unregister_icmp_sender(icmp6_send);
+ unregister_pernet_subsys(&icmpv6_sk_ops);
+ inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
+}
+
+
+static const struct icmp6_err {
+ int err;
+ int fatal;
+} tab_unreach[] = {
+ { /* NOROUTE */
+ .err = ENETUNREACH,
+ .fatal = 0,
+ },
+ { /* ADM_PROHIBITED */
+ .err = EACCES,
+ .fatal = 1,
+ },
+ { /* Was NOT_NEIGHBOUR, now reserved */
+ .err = EHOSTUNREACH,
+ .fatal = 0,
+ },
+ { /* ADDR_UNREACH */
+ .err = EHOSTUNREACH,
+ .fatal = 0,
+ },
+ { /* PORT_UNREACH */
+ .err = ECONNREFUSED,
+ .fatal = 1,
+ },
+ { /* POLICY_FAIL */
+ .err = EACCES,
+ .fatal = 1,
+ },
+ { /* REJECT_ROUTE */
+ .err = EACCES,
+ .fatal = 1,
+ },
+};
+
+int icmpv6_err_convert(u8 type, u8 code, int *err)
+{
+ int fatal = 0;
+
+ *err = EPROTO;
+
+ switch (type) {
+ case ICMPV6_DEST_UNREACH:
+ fatal = 1;
+ if (code < ARRAY_SIZE(tab_unreach)) {
+ *err = tab_unreach[code].err;
+ fatal = tab_unreach[code].fatal;
+ }
+ break;
+
+ case ICMPV6_PKT_TOOBIG:
+ *err = EMSGSIZE;
+ break;
+
+ case ICMPV6_PARAMPROB:
+ *err = EPROTO;
+ fatal = 1;
+ break;
+
+ case ICMPV6_TIME_EXCEED:
+ *err = EHOSTUNREACH;
+ break;
+ }
+
+ return fatal;
+}
+EXPORT_SYMBOL(icmpv6_err_convert);
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table ipv6_icmp_table_template[] = {
+ {
+ .procname = "ratelimit",
+ .data = &init_net.ipv6.sysctl.icmpv6_time,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ },
+ {
+ .procname = "echo_ignore_all",
+ .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { },
+};
+
+struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
+{
+ struct ctl_table *table;
+
+ table = kmemdup(ipv6_icmp_table_template,
+ sizeof(ipv6_icmp_table_template),
+ GFP_KERNEL);
+
+ if (table) {
+ table[0].data = &net->ipv6.sysctl.icmpv6_time;
+ table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all;
+ }
+ return table;
+}
+#endif
diff --git a/net/ipv6/ila/Makefile b/net/ipv6/ila/Makefile
new file mode 100644
index 0000000..b7739ab
--- /dev/null
+++ b/net/ipv6/ila/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for ILA module
+#
+
+obj-$(CONFIG_IPV6_ILA) += ila.o
+
+ila-objs := ila_main.o ila_common.o ila_lwt.o ila_xlat.o
diff --git a/net/ipv6/ila/ila.h b/net/ipv6/ila/ila.h
new file mode 100644
index 0000000..1f747bc
--- /dev/null
+++ b/net/ipv6/ila/ila.h
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2015 Tom Herbert <tom@herbertland.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ */
+
+#ifndef __ILA_H
+#define __ILA_H
+
+#include <linux/errno.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <net/checksum.h>
+#include <net/genetlink.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <uapi/linux/ila.h>
+
+struct ila_locator {
+ union {
+ __u8 v8[8];
+ __be16 v16[4];
+ __be32 v32[2];
+ __be64 v64;
+ };
+};
+
+struct ila_identifier {
+ union {
+ struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u8 __space:4;
+ u8 csum_neutral:1;
+ u8 type:3;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u8 type:3;
+ u8 csum_neutral:1;
+ u8 __space:4;
+#else
+#error "Adjust your <asm/byteorder.h> defines"
+#endif
+ u8 __space2[7];
+ };
+ __u8 v8[8];
+ __be16 v16[4];
+ __be32 v32[2];
+ __be64 v64;
+ };
+};
+
+#define CSUM_NEUTRAL_FLAG htonl(0x10000000)
+
+struct ila_addr {
+ union {
+ struct in6_addr addr;
+ struct {
+ struct ila_locator loc;
+ struct ila_identifier ident;
+ };
+ };
+};
+
+static inline struct ila_addr *ila_a2i(struct in6_addr *addr)
+{
+ return (struct ila_addr *)addr;
+}
+
+static inline bool ila_addr_is_ila(struct ila_addr *iaddr)
+{
+ return (iaddr->ident.type != ILA_ATYPE_IID);
+}
+
+struct ila_params {
+ struct ila_locator locator;
+ struct ila_locator locator_match;
+ __wsum csum_diff;
+ u8 csum_mode;
+ u8 ident_type;
+};
+
+static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
+{
+ __be32 diff[] = {
+ ~from[0], ~from[1], to[0], to[1],
+ };
+
+ return csum_partial(diff, sizeof(diff), 0);
+}
+
+static inline bool ila_csum_neutral_set(struct ila_identifier ident)
+{
+ return !!(ident.csum_neutral);
+}
+
+void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
+ bool set_csum_neutral);
+
+void ila_init_saved_csum(struct ila_params *p);
+
+struct ila_net {
+ struct {
+ struct rhashtable rhash_table;
+ spinlock_t *locks; /* Bucket locks for entry manipulation */
+ unsigned int locks_mask;
+ bool hooks_registered;
+ } xlat;
+};
+
+int ila_lwt_init(void);
+void ila_lwt_fini(void);
+
+int ila_xlat_init_net(struct net *net);
+void ila_xlat_exit_net(struct net *net);
+
+int ila_xlat_nl_cmd_add_mapping(struct sk_buff *skb, struct genl_info *info);
+int ila_xlat_nl_cmd_del_mapping(struct sk_buff *skb, struct genl_info *info);
+int ila_xlat_nl_cmd_get_mapping(struct sk_buff *skb, struct genl_info *info);
+int ila_xlat_nl_cmd_flush(struct sk_buff *skb, struct genl_info *info);
+int ila_xlat_nl_dump_start(struct netlink_callback *cb);
+int ila_xlat_nl_dump_done(struct netlink_callback *cb);
+int ila_xlat_nl_dump(struct sk_buff *skb, struct netlink_callback *cb);
+
+extern unsigned int ila_net_id;
+
+extern struct genl_family ila_nl_family;
+
+#endif /* __ILA_H */
diff --git a/net/ipv6/ila/ila_common.c b/net/ipv6/ila/ila_common.c
new file mode 100644
index 0000000..95e9146
--- /dev/null
+++ b/net/ipv6/ila/ila_common.c
@@ -0,0 +1,155 @@
+#include <linux/errno.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/types.h>
+#include <net/checksum.h>
+#include <net/ip.h>
+#include <net/ip6_fib.h>
+#include <net/lwtunnel.h>
+#include <net/protocol.h>
+#include <uapi/linux/ila.h>
+#include "ila.h"
+
+void ila_init_saved_csum(struct ila_params *p)
+{
+ if (!p->locator_match.v64)
+ return;
+
+ p->csum_diff = compute_csum_diff8(
+ (__be32 *)&p->locator,
+ (__be32 *)&p->locator_match);
+}
+
+static __wsum get_csum_diff_iaddr(struct ila_addr *iaddr, struct ila_params *p)
+{
+ if (p->locator_match.v64)
+ return p->csum_diff;
+ else
+ return compute_csum_diff8((__be32 *)&p->locator,
+ (__be32 *)&iaddr->loc);
+}
+
+static __wsum get_csum_diff(struct ipv6hdr *ip6h, struct ila_params *p)
+{
+ return get_csum_diff_iaddr(ila_a2i(&ip6h->daddr), p);
+}
+
+static void ila_csum_do_neutral_fmt(struct ila_addr *iaddr,
+ struct ila_params *p)
+{
+ __sum16 *adjust = (__force __sum16 *)&iaddr->ident.v16[3];
+ __wsum diff, fval;
+
+ diff = get_csum_diff_iaddr(iaddr, p);
+
+ fval = (__force __wsum)(ila_csum_neutral_set(iaddr->ident) ?
+ CSUM_NEUTRAL_FLAG : ~CSUM_NEUTRAL_FLAG);
+
+ diff = csum_add(diff, fval);
+
+ *adjust = ~csum_fold(csum_add(diff, csum_unfold(*adjust)));
+
+ /* Flip the csum-neutral bit. Either we are doing a SIR->ILA
+ * translation with ILA_CSUM_NEUTRAL_MAP as the csum_method
+ * and the C-bit is not set, or we are doing an ILA-SIR
+ * tranlsation and the C-bit is set.
+ */
+ iaddr->ident.csum_neutral ^= 1;
+}
+
+static void ila_csum_do_neutral_nofmt(struct ila_addr *iaddr,
+ struct ila_params *p)
+{
+ __sum16 *adjust = (__force __sum16 *)&iaddr->ident.v16[3];
+ __wsum diff;
+
+ diff = get_csum_diff_iaddr(iaddr, p);
+
+ *adjust = ~csum_fold(csum_add(diff, csum_unfold(*adjust)));
+}
+
+static void ila_csum_adjust_transport(struct sk_buff *skb,
+ struct ila_params *p)
+{
+ size_t nhoff = sizeof(struct ipv6hdr);
+ struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ __wsum diff;
+
+ switch (ip6h->nexthdr) {
+ case NEXTHDR_TCP:
+ if (likely(pskb_may_pull(skb, nhoff + sizeof(struct tcphdr)))) {
+ struct tcphdr *th = (struct tcphdr *)
+ (skb_network_header(skb) + nhoff);
+
+ diff = get_csum_diff(ip6h, p);
+ inet_proto_csum_replace_by_diff(&th->check, skb,
+ diff, true);
+ }
+ break;
+ case NEXTHDR_UDP:
+ if (likely(pskb_may_pull(skb, nhoff + sizeof(struct udphdr)))) {
+ struct udphdr *uh = (struct udphdr *)
+ (skb_network_header(skb) + nhoff);
+
+ if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
+ diff = get_csum_diff(ip6h, p);
+ inet_proto_csum_replace_by_diff(&uh->check, skb,
+ diff, true);
+ if (!uh->check)
+ uh->check = CSUM_MANGLED_0;
+ }
+ }
+ break;
+ case NEXTHDR_ICMP:
+ if (likely(pskb_may_pull(skb,
+ nhoff + sizeof(struct icmp6hdr)))) {
+ struct icmp6hdr *ih = (struct icmp6hdr *)
+ (skb_network_header(skb) + nhoff);
+
+ diff = get_csum_diff(ip6h, p);
+ inet_proto_csum_replace_by_diff(&ih->icmp6_cksum, skb,
+ diff, true);
+ }
+ break;
+ }
+}
+
+void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
+ bool sir2ila)
+{
+ struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ struct ila_addr *iaddr = ila_a2i(&ip6h->daddr);
+
+ switch (p->csum_mode) {
+ case ILA_CSUM_ADJUST_TRANSPORT:
+ ila_csum_adjust_transport(skb, p);
+ break;
+ case ILA_CSUM_NEUTRAL_MAP:
+ if (sir2ila) {
+ if (WARN_ON(ila_csum_neutral_set(iaddr->ident))) {
+ /* Checksum flag should never be
+ * set in a formatted SIR address.
+ */
+ break;
+ }
+ } else if (!ila_csum_neutral_set(iaddr->ident)) {
+ /* ILA to SIR translation and C-bit isn't
+ * set so we're good.
+ */
+ break;
+ }
+ ila_csum_do_neutral_fmt(iaddr, p);
+ break;
+ case ILA_CSUM_NEUTRAL_MAP_AUTO:
+ ila_csum_do_neutral_nofmt(iaddr, p);
+ break;
+ case ILA_CSUM_NO_ACTION:
+ break;
+ }
+
+ /* Now change destination address */
+ iaddr->loc = p->locator;
+}
diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c
new file mode 100644
index 0000000..3d56a2f
--- /dev/null
+++ b/net/ipv6/ila/ila_lwt.c
@@ -0,0 +1,324 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/errno.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/types.h>
+#include <net/checksum.h>
+#include <net/dst_cache.h>
+#include <net/ip.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#include <net/lwtunnel.h>
+#include <net/protocol.h>
+#include <uapi/linux/ila.h>
+#include "ila.h"
+
+struct ila_lwt {
+ struct ila_params p;
+ struct dst_cache dst_cache;
+ u32 connected : 1;
+ u32 lwt_output : 1;
+};
+
+static inline struct ila_lwt *ila_lwt_lwtunnel(
+ struct lwtunnel_state *lwt)
+{
+ return (struct ila_lwt *)lwt->data;
+}
+
+static inline struct ila_params *ila_params_lwtunnel(
+ struct lwtunnel_state *lwt)
+{
+ return &ila_lwt_lwtunnel(lwt)->p;
+}
+
+static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ struct dst_entry *orig_dst = skb_dst(skb);
+ struct rt6_info *rt = (struct rt6_info *)orig_dst;
+ struct ila_lwt *ilwt = ila_lwt_lwtunnel(orig_dst->lwtstate);
+ struct dst_entry *dst;
+ int err = -EINVAL;
+
+ if (skb->protocol != htons(ETH_P_IPV6))
+ goto drop;
+
+ if (ilwt->lwt_output)
+ ila_update_ipv6_locator(skb,
+ ila_params_lwtunnel(orig_dst->lwtstate),
+ true);
+
+ if (rt->rt6i_flags & (RTF_GATEWAY | RTF_CACHE)) {
+ /* Already have a next hop address in route, no need for
+ * dest cache route.
+ */
+ return orig_dst->lwtstate->orig_output(net, sk, skb);
+ }
+
+ dst = dst_cache_get(&ilwt->dst_cache);
+ if (unlikely(!dst)) {
+ struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ struct flowi6 fl6;
+
+ /* Lookup a route for the new destination. Take into
+ * account that the base route may already have a gateway.
+ */
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_oif = orig_dst->dev->ifindex;
+ fl6.flowi6_iif = LOOPBACK_IFINDEX;
+ fl6.daddr = *rt6_nexthop((struct rt6_info *)orig_dst,
+ &ip6h->daddr);
+
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (dst->error) {
+ err = -EHOSTUNREACH;
+ dst_release(dst);
+ goto drop;
+ }
+
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ goto drop;
+ }
+
+ if (ilwt->connected)
+ dst_cache_set_ip6(&ilwt->dst_cache, dst, &fl6.saddr);
+ }
+
+ skb_dst_set(skb, dst);
+ return dst_output(net, sk, skb);
+
+drop:
+ kfree_skb(skb);
+ return err;
+}
+
+static int ila_input(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb_dst(skb);
+ struct ila_lwt *ilwt = ila_lwt_lwtunnel(dst->lwtstate);
+
+ if (skb->protocol != htons(ETH_P_IPV6))
+ goto drop;
+
+ if (!ilwt->lwt_output)
+ ila_update_ipv6_locator(skb,
+ ila_params_lwtunnel(dst->lwtstate),
+ false);
+
+ return dst->lwtstate->orig_input(skb);
+
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+static const struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
+ [ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
+ [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, },
+ [ILA_ATTR_IDENT_TYPE] = { .type = NLA_U8, },
+ [ILA_ATTR_HOOK_TYPE] = { .type = NLA_U8, },
+};
+
+static int ila_build_state(struct nlattr *nla,
+ unsigned int family, const void *cfg,
+ struct lwtunnel_state **ts,
+ struct netlink_ext_ack *extack)
+{
+ struct ila_lwt *ilwt;
+ struct ila_params *p;
+ struct nlattr *tb[ILA_ATTR_MAX + 1];
+ struct lwtunnel_state *newts;
+ const struct fib6_config *cfg6 = cfg;
+ struct ila_addr *iaddr;
+ u8 ident_type = ILA_ATYPE_USE_FORMAT;
+ u8 hook_type = ILA_HOOK_ROUTE_OUTPUT;
+ u8 csum_mode = ILA_CSUM_NO_ACTION;
+ bool lwt_output = true;
+ u8 eff_ident_type;
+ int ret;
+
+ if (family != AF_INET6)
+ return -EINVAL;
+
+ ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla, ila_nl_policy, extack);
+ if (ret < 0)
+ return ret;
+
+ if (!tb[ILA_ATTR_LOCATOR])
+ return -EINVAL;
+
+ iaddr = (struct ila_addr *)&cfg6->fc_dst;
+
+ if (tb[ILA_ATTR_IDENT_TYPE])
+ ident_type = nla_get_u8(tb[ILA_ATTR_IDENT_TYPE]);
+
+ if (ident_type == ILA_ATYPE_USE_FORMAT) {
+ /* Infer identifier type from type field in formatted
+ * identifier.
+ */
+
+ if (cfg6->fc_dst_len < 8 * sizeof(struct ila_locator) + 3) {
+ /* Need to have full locator and at least type field
+ * included in destination
+ */
+ return -EINVAL;
+ }
+
+ eff_ident_type = iaddr->ident.type;
+ } else {
+ eff_ident_type = ident_type;
+ }
+
+ switch (eff_ident_type) {
+ case ILA_ATYPE_IID:
+ /* Don't allow ILA for IID type */
+ return -EINVAL;
+ case ILA_ATYPE_LUID:
+ break;
+ case ILA_ATYPE_VIRT_V4:
+ case ILA_ATYPE_VIRT_UNI_V6:
+ case ILA_ATYPE_VIRT_MULTI_V6:
+ case ILA_ATYPE_NONLOCAL_ADDR:
+ /* These ILA formats are not supported yet. */
+ default:
+ return -EINVAL;
+ }
+
+ if (tb[ILA_ATTR_HOOK_TYPE])
+ hook_type = nla_get_u8(tb[ILA_ATTR_HOOK_TYPE]);
+
+ switch (hook_type) {
+ case ILA_HOOK_ROUTE_OUTPUT:
+ lwt_output = true;
+ break;
+ case ILA_HOOK_ROUTE_INPUT:
+ lwt_output = false;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (tb[ILA_ATTR_CSUM_MODE])
+ csum_mode = nla_get_u8(tb[ILA_ATTR_CSUM_MODE]);
+
+ if (csum_mode == ILA_CSUM_NEUTRAL_MAP &&
+ ila_csum_neutral_set(iaddr->ident)) {
+ /* Don't allow translation if checksum neutral bit is
+ * configured and it's set in the SIR address.
+ */
+ return -EINVAL;
+ }
+
+ newts = lwtunnel_state_alloc(sizeof(*ilwt));
+ if (!newts)
+ return -ENOMEM;
+
+ ilwt = ila_lwt_lwtunnel(newts);
+ ret = dst_cache_init(&ilwt->dst_cache, GFP_ATOMIC);
+ if (ret) {
+ kfree(newts);
+ return ret;
+ }
+
+ ilwt->lwt_output = !!lwt_output;
+
+ p = ila_params_lwtunnel(newts);
+
+ p->csum_mode = csum_mode;
+ p->ident_type = ident_type;
+ p->locator.v64 = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);
+
+ /* Precompute checksum difference for translation since we
+ * know both the old locator and the new one.
+ */
+ p->locator_match = iaddr->loc;
+
+ ila_init_saved_csum(p);
+
+ newts->type = LWTUNNEL_ENCAP_ILA;
+ newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
+ LWTUNNEL_STATE_INPUT_REDIRECT;
+
+ if (cfg6->fc_dst_len == 8 * sizeof(struct in6_addr))
+ ilwt->connected = 1;
+
+ *ts = newts;
+
+ return 0;
+}
+
+static void ila_destroy_state(struct lwtunnel_state *lwt)
+{
+ dst_cache_destroy(&ila_lwt_lwtunnel(lwt)->dst_cache);
+}
+
+static int ila_fill_encap_info(struct sk_buff *skb,
+ struct lwtunnel_state *lwtstate)
+{
+ struct ila_params *p = ila_params_lwtunnel(lwtstate);
+ struct ila_lwt *ilwt = ila_lwt_lwtunnel(lwtstate);
+
+ if (nla_put_u64_64bit(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator.v64,
+ ILA_ATTR_PAD))
+ goto nla_put_failure;
+
+ if (nla_put_u8(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode))
+ goto nla_put_failure;
+
+ if (nla_put_u8(skb, ILA_ATTR_IDENT_TYPE, (__force u8)p->ident_type))
+ goto nla_put_failure;
+
+ if (nla_put_u8(skb, ILA_ATTR_HOOK_TYPE,
+ ilwt->lwt_output ? ILA_HOOK_ROUTE_OUTPUT :
+ ILA_HOOK_ROUTE_INPUT))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
+{
+ return nla_total_size_64bit(sizeof(u64)) + /* ILA_ATTR_LOCATOR */
+ nla_total_size(sizeof(u8)) + /* ILA_ATTR_CSUM_MODE */
+ nla_total_size(sizeof(u8)) + /* ILA_ATTR_IDENT_TYPE */
+ nla_total_size(sizeof(u8)) + /* ILA_ATTR_HOOK_TYPE */
+ 0;
+}
+
+static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
+{
+ struct ila_params *a_p = ila_params_lwtunnel(a);
+ struct ila_params *b_p = ila_params_lwtunnel(b);
+
+ return (a_p->locator.v64 != b_p->locator.v64);
+}
+
+static const struct lwtunnel_encap_ops ila_encap_ops = {
+ .build_state = ila_build_state,
+ .destroy_state = ila_destroy_state,
+ .output = ila_output,
+ .input = ila_input,
+ .fill_encap = ila_fill_encap_info,
+ .get_encap_size = ila_encap_nlsize,
+ .cmp_encap = ila_encap_cmp,
+ .owner = THIS_MODULE,
+};
+
+int ila_lwt_init(void)
+{
+ return lwtunnel_encap_add_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
+}
+
+void ila_lwt_fini(void)
+{
+ lwtunnel_encap_del_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
+}
diff --git a/net/ipv6/ila/ila_main.c b/net/ipv6/ila/ila_main.c
new file mode 100644
index 0000000..18fac76
--- /dev/null
+++ b/net/ipv6/ila/ila_main.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <net/genetlink.h>
+#include <net/ila.h>
+#include <net/netns/generic.h>
+#include <uapi/linux/genetlink.h>
+#include "ila.h"
+
+static const struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
+ [ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
+ [ILA_ATTR_LOCATOR_MATCH] = { .type = NLA_U64, },
+ [ILA_ATTR_IFINDEX] = { .type = NLA_U32, },
+ [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, },
+ [ILA_ATTR_IDENT_TYPE] = { .type = NLA_U8, },
+};
+
+static const struct genl_ops ila_nl_ops[] = {
+ {
+ .cmd = ILA_CMD_ADD,
+ .doit = ila_xlat_nl_cmd_add_mapping,
+ .policy = ila_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = ILA_CMD_DEL,
+ .doit = ila_xlat_nl_cmd_del_mapping,
+ .policy = ila_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = ILA_CMD_FLUSH,
+ .doit = ila_xlat_nl_cmd_flush,
+ .policy = ila_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = ILA_CMD_GET,
+ .doit = ila_xlat_nl_cmd_get_mapping,
+ .start = ila_xlat_nl_dump_start,
+ .dumpit = ila_xlat_nl_dump,
+ .done = ila_xlat_nl_dump_done,
+ .policy = ila_nl_policy,
+ },
+};
+
+unsigned int ila_net_id;
+
+struct genl_family ila_nl_family __ro_after_init = {
+ .hdrsize = 0,
+ .name = ILA_GENL_NAME,
+ .version = ILA_GENL_VERSION,
+ .maxattr = ILA_ATTR_MAX,
+ .netnsok = true,
+ .parallel_ops = true,
+ .module = THIS_MODULE,
+ .ops = ila_nl_ops,
+ .n_ops = ARRAY_SIZE(ila_nl_ops),
+};
+
+static __net_init int ila_init_net(struct net *net)
+{
+ int err;
+
+ err = ila_xlat_init_net(net);
+ if (err)
+ goto ila_xlat_init_fail;
+
+ return 0;
+
+ila_xlat_init_fail:
+ return err;
+}
+
+static __net_exit void ila_exit_net(struct net *net)
+{
+ ila_xlat_exit_net(net);
+}
+
+static struct pernet_operations ila_net_ops = {
+ .init = ila_init_net,
+ .exit = ila_exit_net,
+ .id = &ila_net_id,
+ .size = sizeof(struct ila_net),
+};
+
+static int __init ila_init(void)
+{
+ int ret;
+
+ ret = register_pernet_device(&ila_net_ops);
+ if (ret)
+ goto register_device_fail;
+
+ ret = genl_register_family(&ila_nl_family);
+ if (ret)
+ goto register_family_fail;
+
+ ret = ila_lwt_init();
+ if (ret)
+ goto fail_lwt;
+
+ return 0;
+
+fail_lwt:
+ genl_unregister_family(&ila_nl_family);
+register_family_fail:
+ unregister_pernet_device(&ila_net_ops);
+register_device_fail:
+ return ret;
+}
+
+static void __exit ila_fini(void)
+{
+ ila_lwt_fini();
+ genl_unregister_family(&ila_nl_family);
+ unregister_pernet_device(&ila_net_ops);
+}
+
+module_init(ila_init);
+module_exit(ila_fini);
+MODULE_AUTHOR("Tom Herbert <tom@herbertland.com>");
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/ila/ila_xlat.c b/net/ipv6/ila/ila_xlat.c
new file mode 100644
index 0000000..17c455f
--- /dev/null
+++ b/net/ipv6/ila/ila_xlat.c
@@ -0,0 +1,665 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/jhash.h>
+#include <linux/netfilter.h>
+#include <linux/rcupdate.h>
+#include <linux/rhashtable.h>
+#include <linux/vmalloc.h>
+#include <net/genetlink.h>
+#include <net/ila.h>
+#include <net/netns/generic.h>
+#include <uapi/linux/genetlink.h>
+#include "ila.h"
+
+struct ila_xlat_params {
+ struct ila_params ip;
+ int ifindex;
+};
+
+struct ila_map {
+ struct ila_xlat_params xp;
+ struct rhash_head node;
+ struct ila_map __rcu *next;
+ struct rcu_head rcu;
+};
+
+#define MAX_LOCKS 1024
+#define LOCKS_PER_CPU 10
+
+static int alloc_ila_locks(struct ila_net *ilan)
+{
+ return alloc_bucket_spinlocks(&ilan->xlat.locks, &ilan->xlat.locks_mask,
+ MAX_LOCKS, LOCKS_PER_CPU,
+ GFP_KERNEL);
+}
+
+static u32 hashrnd __read_mostly;
+static __always_inline void __ila_hash_secret_init(void)
+{
+ net_get_random_once(&hashrnd, sizeof(hashrnd));
+}
+
+static inline u32 ila_locator_hash(struct ila_locator loc)
+{
+ u32 *v = (u32 *)loc.v32;
+
+ __ila_hash_secret_init();
+ return jhash_2words(v[0], v[1], hashrnd);
+}
+
+static inline spinlock_t *ila_get_lock(struct ila_net *ilan,
+ struct ila_locator loc)
+{
+ return &ilan->xlat.locks[ila_locator_hash(loc) & ilan->xlat.locks_mask];
+}
+
+static inline int ila_cmp_wildcards(struct ila_map *ila,
+ struct ila_addr *iaddr, int ifindex)
+{
+ return (ila->xp.ifindex && ila->xp.ifindex != ifindex);
+}
+
+static inline int ila_cmp_params(struct ila_map *ila,
+ struct ila_xlat_params *xp)
+{
+ return (ila->xp.ifindex != xp->ifindex);
+}
+
+static int ila_cmpfn(struct rhashtable_compare_arg *arg,
+ const void *obj)
+{
+ const struct ila_map *ila = obj;
+
+ return (ila->xp.ip.locator_match.v64 != *(__be64 *)arg->key);
+}
+
+static inline int ila_order(struct ila_map *ila)
+{
+ int score = 0;
+
+ if (ila->xp.ifindex)
+ score += 1 << 1;
+
+ return score;
+}
+
+static const struct rhashtable_params rht_params = {
+ .nelem_hint = 1024,
+ .head_offset = offsetof(struct ila_map, node),
+ .key_offset = offsetof(struct ila_map, xp.ip.locator_match),
+ .key_len = sizeof(u64), /* identifier */
+ .max_size = 1048576,
+ .min_size = 256,
+ .automatic_shrinking = true,
+ .obj_cmpfn = ila_cmpfn,
+};
+
+static int parse_nl_config(struct genl_info *info,
+ struct ila_xlat_params *xp)
+{
+ memset(xp, 0, sizeof(*xp));
+
+ if (info->attrs[ILA_ATTR_LOCATOR])
+ xp->ip.locator.v64 = (__force __be64)nla_get_u64(
+ info->attrs[ILA_ATTR_LOCATOR]);
+
+ if (info->attrs[ILA_ATTR_LOCATOR_MATCH])
+ xp->ip.locator_match.v64 = (__force __be64)nla_get_u64(
+ info->attrs[ILA_ATTR_LOCATOR_MATCH]);
+
+ if (info->attrs[ILA_ATTR_CSUM_MODE])
+ xp->ip.csum_mode = nla_get_u8(info->attrs[ILA_ATTR_CSUM_MODE]);
+ else
+ xp->ip.csum_mode = ILA_CSUM_NO_ACTION;
+
+ if (info->attrs[ILA_ATTR_IDENT_TYPE])
+ xp->ip.ident_type = nla_get_u8(
+ info->attrs[ILA_ATTR_IDENT_TYPE]);
+ else
+ xp->ip.ident_type = ILA_ATYPE_USE_FORMAT;
+
+ if (info->attrs[ILA_ATTR_IFINDEX])
+ xp->ifindex = nla_get_s32(info->attrs[ILA_ATTR_IFINDEX]);
+
+ return 0;
+}
+
+/* Must be called with rcu readlock */
+static inline struct ila_map *ila_lookup_wildcards(struct ila_addr *iaddr,
+ int ifindex,
+ struct ila_net *ilan)
+{
+ struct ila_map *ila;
+
+ ila = rhashtable_lookup_fast(&ilan->xlat.rhash_table, &iaddr->loc,
+ rht_params);
+ while (ila) {
+ if (!ila_cmp_wildcards(ila, iaddr, ifindex))
+ return ila;
+ ila = rcu_access_pointer(ila->next);
+ }
+
+ return NULL;
+}
+
+/* Must be called with rcu readlock */
+static inline struct ila_map *ila_lookup_by_params(struct ila_xlat_params *xp,
+ struct ila_net *ilan)
+{
+ struct ila_map *ila;
+
+ ila = rhashtable_lookup_fast(&ilan->xlat.rhash_table,
+ &xp->ip.locator_match,
+ rht_params);
+ while (ila) {
+ if (!ila_cmp_params(ila, xp))
+ return ila;
+ ila = rcu_access_pointer(ila->next);
+ }
+
+ return NULL;
+}
+
+static inline void ila_release(struct ila_map *ila)
+{
+ kfree_rcu(ila, rcu);
+}
+
+static void ila_free_node(struct ila_map *ila)
+{
+ struct ila_map *next;
+
+ /* Assume rcu_readlock held */
+ while (ila) {
+ next = rcu_access_pointer(ila->next);
+ ila_release(ila);
+ ila = next;
+ }
+}
+
+static void ila_free_cb(void *ptr, void *arg)
+{
+ ila_free_node((struct ila_map *)ptr);
+}
+
+static int ila_xlat_addr(struct sk_buff *skb, bool sir2ila);
+
+static unsigned int
+ila_nf_input(void *priv,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ ila_xlat_addr(skb, false);
+ return NF_ACCEPT;
+}
+
+static const struct nf_hook_ops ila_nf_hook_ops[] = {
+ {
+ .hook = ila_nf_input,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_PRE_ROUTING,
+ .priority = -1,
+ },
+};
+
+static int ila_add_mapping(struct net *net, struct ila_xlat_params *xp)
+{
+ struct ila_net *ilan = net_generic(net, ila_net_id);
+ struct ila_map *ila, *head;
+ spinlock_t *lock = ila_get_lock(ilan, xp->ip.locator_match);
+ int err = 0, order;
+
+ if (!ilan->xlat.hooks_registered) {
+ /* We defer registering net hooks in the namespace until the
+ * first mapping is added.
+ */
+ err = nf_register_net_hooks(net, ila_nf_hook_ops,
+ ARRAY_SIZE(ila_nf_hook_ops));
+ if (err)
+ return err;
+
+ ilan->xlat.hooks_registered = true;
+ }
+
+ ila = kzalloc(sizeof(*ila), GFP_KERNEL);
+ if (!ila)
+ return -ENOMEM;
+
+ ila_init_saved_csum(&xp->ip);
+
+ ila->xp = *xp;
+
+ order = ila_order(ila);
+
+ spin_lock(lock);
+
+ head = rhashtable_lookup_fast(&ilan->xlat.rhash_table,
+ &xp->ip.locator_match,
+ rht_params);
+ if (!head) {
+ /* New entry for the rhash_table */
+ err = rhashtable_lookup_insert_fast(&ilan->xlat.rhash_table,
+ &ila->node, rht_params);
+ } else {
+ struct ila_map *tila = head, *prev = NULL;
+
+ do {
+ if (!ila_cmp_params(tila, xp)) {
+ err = -EEXIST;
+ goto out;
+ }
+
+ if (order > ila_order(tila))
+ break;
+
+ prev = tila;
+ tila = rcu_dereference_protected(tila->next,
+ lockdep_is_held(lock));
+ } while (tila);
+
+ if (prev) {
+ /* Insert in sub list of head */
+ RCU_INIT_POINTER(ila->next, tila);
+ rcu_assign_pointer(prev->next, ila);
+ } else {
+ /* Make this ila new head */
+ RCU_INIT_POINTER(ila->next, head);
+ err = rhashtable_replace_fast(&ilan->xlat.rhash_table,
+ &head->node,
+ &ila->node, rht_params);
+ if (err)
+ goto out;
+ }
+ }
+
+out:
+ spin_unlock(lock);
+
+ if (err)
+ kfree(ila);
+
+ return err;
+}
+
+static int ila_del_mapping(struct net *net, struct ila_xlat_params *xp)
+{
+ struct ila_net *ilan = net_generic(net, ila_net_id);
+ struct ila_map *ila, *head, *prev;
+ spinlock_t *lock = ila_get_lock(ilan, xp->ip.locator_match);
+ int err = -ENOENT;
+
+ spin_lock(lock);
+
+ head = rhashtable_lookup_fast(&ilan->xlat.rhash_table,
+ &xp->ip.locator_match, rht_params);
+ ila = head;
+
+ prev = NULL;
+
+ while (ila) {
+ if (ila_cmp_params(ila, xp)) {
+ prev = ila;
+ ila = rcu_dereference_protected(ila->next,
+ lockdep_is_held(lock));
+ continue;
+ }
+
+ err = 0;
+
+ if (prev) {
+ /* Not head, just delete from list */
+ rcu_assign_pointer(prev->next, ila->next);
+ } else {
+ /* It is the head. If there is something in the
+ * sublist we need to make a new head.
+ */
+ head = rcu_dereference_protected(ila->next,
+ lockdep_is_held(lock));
+ if (head) {
+ /* Put first entry in the sublist into the
+ * table
+ */
+ err = rhashtable_replace_fast(
+ &ilan->xlat.rhash_table, &ila->node,
+ &head->node, rht_params);
+ if (err)
+ goto out;
+ } else {
+ /* Entry no longer used */
+ err = rhashtable_remove_fast(
+ &ilan->xlat.rhash_table,
+ &ila->node, rht_params);
+ }
+ }
+
+ ila_release(ila);
+
+ break;
+ }
+
+out:
+ spin_unlock(lock);
+
+ return err;
+}
+
+int ila_xlat_nl_cmd_add_mapping(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = genl_info_net(info);
+ struct ila_xlat_params p;
+ int err;
+
+ err = parse_nl_config(info, &p);
+ if (err)
+ return err;
+
+ return ila_add_mapping(net, &p);
+}
+
+int ila_xlat_nl_cmd_del_mapping(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = genl_info_net(info);
+ struct ila_xlat_params xp;
+ int err;
+
+ err = parse_nl_config(info, &xp);
+ if (err)
+ return err;
+
+ ila_del_mapping(net, &xp);
+
+ return 0;
+}
+
+static inline spinlock_t *lock_from_ila_map(struct ila_net *ilan,
+ struct ila_map *ila)
+{
+ return ila_get_lock(ilan, ila->xp.ip.locator_match);
+}
+
+int ila_xlat_nl_cmd_flush(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = genl_info_net(info);
+ struct ila_net *ilan = net_generic(net, ila_net_id);
+ struct rhashtable_iter iter;
+ struct ila_map *ila;
+ spinlock_t *lock;
+ int ret;
+
+ ret = rhashtable_walk_init(&ilan->xlat.rhash_table, &iter, GFP_KERNEL);
+ if (ret)
+ goto done;
+
+ rhashtable_walk_start(&iter);
+
+ for (;;) {
+ ila = rhashtable_walk_next(&iter);
+
+ if (IS_ERR(ila)) {
+ if (PTR_ERR(ila) == -EAGAIN)
+ continue;
+ ret = PTR_ERR(ila);
+ goto done;
+ } else if (!ila) {
+ break;
+ }
+
+ lock = lock_from_ila_map(ilan, ila);
+
+ spin_lock(lock);
+
+ ret = rhashtable_remove_fast(&ilan->xlat.rhash_table,
+ &ila->node, rht_params);
+ if (!ret)
+ ila_free_node(ila);
+
+ spin_unlock(lock);
+
+ if (ret)
+ break;
+ }
+
+done:
+ rhashtable_walk_stop(&iter);
+ return ret;
+}
+
+static int ila_fill_info(struct ila_map *ila, struct sk_buff *msg)
+{
+ if (nla_put_u64_64bit(msg, ILA_ATTR_LOCATOR,
+ (__force u64)ila->xp.ip.locator.v64,
+ ILA_ATTR_PAD) ||
+ nla_put_u64_64bit(msg, ILA_ATTR_LOCATOR_MATCH,
+ (__force u64)ila->xp.ip.locator_match.v64,
+ ILA_ATTR_PAD) ||
+ nla_put_s32(msg, ILA_ATTR_IFINDEX, ila->xp.ifindex) ||
+ nla_put_u8(msg, ILA_ATTR_CSUM_MODE, ila->xp.ip.csum_mode) ||
+ nla_put_u8(msg, ILA_ATTR_IDENT_TYPE, ila->xp.ip.ident_type))
+ return -1;
+
+ return 0;
+}
+
+static int ila_dump_info(struct ila_map *ila,
+ u32 portid, u32 seq, u32 flags,
+ struct sk_buff *skb, u8 cmd)
+{
+ void *hdr;
+
+ hdr = genlmsg_put(skb, portid, seq, &ila_nl_family, flags, cmd);
+ if (!hdr)
+ return -ENOMEM;
+
+ if (ila_fill_info(ila, skb) < 0)
+ goto nla_put_failure;
+
+ genlmsg_end(skb, hdr);
+ return 0;
+
+nla_put_failure:
+ genlmsg_cancel(skb, hdr);
+ return -EMSGSIZE;
+}
+
+int ila_xlat_nl_cmd_get_mapping(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = genl_info_net(info);
+ struct ila_net *ilan = net_generic(net, ila_net_id);
+ struct sk_buff *msg;
+ struct ila_xlat_params xp;
+ struct ila_map *ila;
+ int ret;
+
+ ret = parse_nl_config(info, &xp);
+ if (ret)
+ return ret;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ rcu_read_lock();
+
+ ila = ila_lookup_by_params(&xp, ilan);
+ if (ila) {
+ ret = ila_dump_info(ila,
+ info->snd_portid,
+ info->snd_seq, 0, msg,
+ info->genlhdr->cmd);
+ }
+
+ rcu_read_unlock();
+
+ if (ret < 0)
+ goto out_free;
+
+ return genlmsg_reply(msg, info);
+
+out_free:
+ nlmsg_free(msg);
+ return ret;
+}
+
+struct ila_dump_iter {
+ struct rhashtable_iter rhiter;
+ int skip;
+};
+
+int ila_xlat_nl_dump_start(struct netlink_callback *cb)
+{
+ struct net *net = sock_net(cb->skb->sk);
+ struct ila_net *ilan = net_generic(net, ila_net_id);
+ struct ila_dump_iter *iter;
+ int ret;
+
+ iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+ if (!iter)
+ return -ENOMEM;
+
+ ret = rhashtable_walk_init(&ilan->xlat.rhash_table, &iter->rhiter,
+ GFP_KERNEL);
+ if (ret) {
+ kfree(iter);
+ return ret;
+ }
+
+ iter->skip = 0;
+ cb->args[0] = (long)iter;
+
+ return ret;
+}
+
+int ila_xlat_nl_dump_done(struct netlink_callback *cb)
+{
+ struct ila_dump_iter *iter = (struct ila_dump_iter *)cb->args[0];
+
+ rhashtable_walk_exit(&iter->rhiter);
+
+ kfree(iter);
+
+ return 0;
+}
+
+int ila_xlat_nl_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct ila_dump_iter *iter = (struct ila_dump_iter *)cb->args[0];
+ struct rhashtable_iter *rhiter = &iter->rhiter;
+ int skip = iter->skip;
+ struct ila_map *ila;
+ int ret;
+
+ rhashtable_walk_start(rhiter);
+
+ /* Get first entry */
+ ila = rhashtable_walk_peek(rhiter);
+
+ if (ila && !IS_ERR(ila) && skip) {
+ /* Skip over visited entries */
+
+ while (ila && skip) {
+ /* Skip over any ila entries in this list that we
+ * have already dumped.
+ */
+ ila = rcu_access_pointer(ila->next);
+ skip--;
+ }
+ }
+
+ skip = 0;
+
+ for (;;) {
+ if (IS_ERR(ila)) {
+ ret = PTR_ERR(ila);
+ if (ret == -EAGAIN) {
+ /* Table has changed and iter has reset. Return
+ * -EAGAIN to the application even if we have
+ * written data to the skb. The application
+ * needs to deal with this.
+ */
+
+ goto out_ret;
+ } else {
+ break;
+ }
+ } else if (!ila) {
+ ret = 0;
+ break;
+ }
+
+ while (ila) {
+ ret = ila_dump_info(ila, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ skb, ILA_CMD_GET);
+ if (ret)
+ goto out;
+
+ skip++;
+ ila = rcu_access_pointer(ila->next);
+ }
+
+ skip = 0;
+ ila = rhashtable_walk_next(rhiter);
+ }
+
+out:
+ iter->skip = skip;
+ ret = (skb->len ? : ret);
+
+out_ret:
+ rhashtable_walk_stop(rhiter);
+ return ret;
+}
+
+#define ILA_HASH_TABLE_SIZE 1024
+
+int ila_xlat_init_net(struct net *net)
+{
+ struct ila_net *ilan = net_generic(net, ila_net_id);
+ int err;
+
+ err = alloc_ila_locks(ilan);
+ if (err)
+ return err;
+
+ rhashtable_init(&ilan->xlat.rhash_table, &rht_params);
+
+ return 0;
+}
+
+void ila_xlat_exit_net(struct net *net)
+{
+ struct ila_net *ilan = net_generic(net, ila_net_id);
+
+ rhashtable_free_and_destroy(&ilan->xlat.rhash_table, ila_free_cb, NULL);
+
+ free_bucket_spinlocks(ilan->xlat.locks);
+
+ if (ilan->xlat.hooks_registered)
+ nf_unregister_net_hooks(net, ila_nf_hook_ops,
+ ARRAY_SIZE(ila_nf_hook_ops));
+}
+
+static int ila_xlat_addr(struct sk_buff *skb, bool sir2ila)
+{
+ struct ila_map *ila;
+ struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ struct net *net = dev_net(skb->dev);
+ struct ila_net *ilan = net_generic(net, ila_net_id);
+ struct ila_addr *iaddr = ila_a2i(&ip6h->daddr);
+
+ /* Assumes skb contains a valid IPv6 header that is pulled */
+
+ /* No check here that ILA type in the mapping matches what is in the
+ * address. We assume that whatever sender gaves us can be translated.
+ * The checksum mode however is relevant.
+ */
+
+ rcu_read_lock();
+
+ ila = ila_lookup_wildcards(iaddr, skb->dev->ifindex, ilan);
+ if (ila)
+ ila_update_ipv6_locator(skb, &ila->xp.ip, sir2ila);
+
+ rcu_read_unlock();
+
+ return 0;
+}
diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
new file mode 100644
index 0000000..9a31d13
--- /dev/null
+++ b/net/ipv6/inet6_connection_sock.c
@@ -0,0 +1,158 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Support for INET6 connection oriented protocols.
+ *
+ * Authors: See the TCPv6 sources
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or(at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/in6.h>
+#include <linux/ipv6.h>
+#include <linux/jhash.h>
+#include <linux/slab.h>
+
+#include <net/addrconf.h>
+#include <net/inet_connection_sock.h>
+#include <net/inet_ecn.h>
+#include <net/inet_hashtables.h>
+#include <net/ip6_route.h>
+#include <net/sock.h>
+#include <net/inet6_connection_sock.h>
+#include <net/sock_reuseport.h>
+
+struct dst_entry *inet6_csk_route_req(const struct sock *sk,
+ struct flowi6 *fl6,
+ const struct request_sock *req,
+ u8 proto)
+{
+ struct inet_request_sock *ireq = inet_rsk(req);
+ const struct ipv6_pinfo *np = inet6_sk(sk);
+ struct in6_addr *final_p, final;
+ struct dst_entry *dst;
+
+ memset(fl6, 0, sizeof(*fl6));
+ fl6->flowi6_proto = proto;
+ fl6->daddr = ireq->ir_v6_rmt_addr;
+ rcu_read_lock();
+ final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
+ rcu_read_unlock();
+ fl6->saddr = ireq->ir_v6_loc_addr;
+ fl6->flowi6_oif = ireq->ir_iif;
+ fl6->flowi6_mark = ireq->ir_mark;
+ fl6->fl6_dport = ireq->ir_rmt_port;
+ fl6->fl6_sport = htons(ireq->ir_num);
+ fl6->flowi6_uid = sk->sk_uid;
+ security_req_classify_flow(req, flowi6_to_flowi(fl6));
+
+ dst = ip6_dst_lookup_flow(sk, fl6, final_p);
+ if (IS_ERR(dst))
+ return NULL;
+
+ return dst;
+}
+EXPORT_SYMBOL(inet6_csk_route_req);
+
+void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
+{
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
+
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_addr = sk->sk_v6_daddr;
+ sin6->sin6_port = inet_sk(sk)->inet_dport;
+ /* We do not store received flowlabel for TCP */
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
+ sk->sk_bound_dev_if);
+}
+EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
+
+static inline
+struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
+{
+ return __sk_dst_check(sk, cookie);
+}
+
+static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
+ struct flowi6 *fl6)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct in6_addr *final_p, final;
+ struct dst_entry *dst;
+
+ memset(fl6, 0, sizeof(*fl6));
+ fl6->flowi6_proto = sk->sk_protocol;
+ fl6->daddr = sk->sk_v6_daddr;
+ fl6->saddr = np->saddr;
+ fl6->flowlabel = np->flow_label;
+ IP6_ECN_flow_xmit(sk, fl6->flowlabel);
+ fl6->flowi6_oif = sk->sk_bound_dev_if;
+ fl6->flowi6_mark = sk->sk_mark;
+ fl6->fl6_sport = inet->inet_sport;
+ fl6->fl6_dport = inet->inet_dport;
+ fl6->flowi6_uid = sk->sk_uid;
+ security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
+
+ rcu_read_lock();
+ final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
+ rcu_read_unlock();
+
+ dst = __inet6_csk_dst_check(sk, np->dst_cookie);
+ if (!dst) {
+ dst = ip6_dst_lookup_flow(sk, fl6, final_p);
+
+ if (!IS_ERR(dst))
+ ip6_dst_store(sk, dst, NULL, NULL);
+ }
+ return dst;
+}
+
+int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct flowi6 fl6;
+ struct dst_entry *dst;
+ int res;
+
+ dst = inet6_csk_route_socket(sk, &fl6);
+ if (IS_ERR(dst)) {
+ sk->sk_err_soft = -PTR_ERR(dst);
+ sk->sk_route_caps = 0;
+ kfree_skb(skb);
+ return PTR_ERR(dst);
+ }
+
+ rcu_read_lock();
+ skb_dst_set_noref(skb, dst);
+
+ /* Restore final destination back after routing done */
+ fl6.daddr = sk->sk_v6_daddr;
+
+ res = ip6_xmit(sk, skb, &fl6, sk->sk_mark, rcu_dereference(np->opt),
+ np->tclass);
+ rcu_read_unlock();
+ return res;
+}
+EXPORT_SYMBOL_GPL(inet6_csk_xmit);
+
+struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
+{
+ struct flowi6 fl6;
+ struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
+
+ if (IS_ERR(dst))
+ return NULL;
+ dst->ops->update_pmtu(dst, sk, NULL, mtu);
+
+ dst = inet6_csk_route_socket(sk, &fl6);
+ return IS_ERR(dst) ? NULL : dst;
+}
+EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
new file mode 100644
index 0000000..3d7c746
--- /dev/null
+++ b/net/ipv6/inet6_hashtables.c
@@ -0,0 +1,346 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Generic INET6 transport hashtables
+ *
+ * Authors: Lotsa people, from code originally in tcp, generalised here
+ * by Arnaldo Carvalho de Melo <acme@mandriva.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/random.h>
+
+#include <net/addrconf.h>
+#include <net/inet_connection_sock.h>
+#include <net/inet_hashtables.h>
+#include <net/inet6_hashtables.h>
+#include <net/secure_seq.h>
+#include <net/ip.h>
+#include <net/sock_reuseport.h>
+
+u32 inet6_ehashfn(const struct net *net,
+ const struct in6_addr *laddr, const u16 lport,
+ const struct in6_addr *faddr, const __be16 fport)
+{
+ static u32 inet6_ehash_secret __read_mostly;
+ static u32 ipv6_hash_secret __read_mostly;
+
+ u32 lhash, fhash;
+
+ net_get_random_once(&inet6_ehash_secret, sizeof(inet6_ehash_secret));
+ net_get_random_once(&ipv6_hash_secret, sizeof(ipv6_hash_secret));
+
+ lhash = (__force u32)laddr->s6_addr32[3];
+ fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret);
+
+ return __inet6_ehashfn(lhash, lport, fhash, fport,
+ inet6_ehash_secret + net_hash_mix(net));
+}
+
+/*
+ * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
+ * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
+ *
+ * The sockhash lock must be held as a reader here.
+ */
+struct sock *__inet6_lookup_established(struct net *net,
+ struct inet_hashinfo *hashinfo,
+ const struct in6_addr *saddr,
+ const __be16 sport,
+ const struct in6_addr *daddr,
+ const u16 hnum,
+ const int dif, const int sdif)
+{
+ struct sock *sk;
+ const struct hlist_nulls_node *node;
+ const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
+ /* Optimize here for direct hit, only listening connections can
+ * have wildcards anyways.
+ */
+ unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
+ unsigned int slot = hash & hashinfo->ehash_mask;
+ struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
+
+
+begin:
+ sk_nulls_for_each_rcu(sk, node, &head->chain) {
+ if (sk->sk_hash != hash)
+ continue;
+ if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif, sdif))
+ continue;
+ if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
+ goto out;
+
+ if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif, sdif))) {
+ sock_gen_put(sk);
+ goto begin;
+ }
+ goto found;
+ }
+ if (get_nulls_value(node) != slot)
+ goto begin;
+out:
+ sk = NULL;
+found:
+ return sk;
+}
+EXPORT_SYMBOL(__inet6_lookup_established);
+
+static inline int compute_score(struct sock *sk, struct net *net,
+ const unsigned short hnum,
+ const struct in6_addr *daddr,
+ const int dif, const int sdif, bool exact_dif)
+{
+ int score = -1;
+
+ if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
+ sk->sk_family == PF_INET6) {
+
+ score = 1;
+ if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
+ if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
+ return -1;
+ score++;
+ }
+ if (sk->sk_bound_dev_if || exact_dif) {
+ bool dev_match = (sk->sk_bound_dev_if == dif ||
+ sk->sk_bound_dev_if == sdif);
+
+ if (!dev_match)
+ return -1;
+ if (sk->sk_bound_dev_if)
+ score++;
+ }
+ if (sk->sk_incoming_cpu == raw_smp_processor_id())
+ score++;
+ }
+ return score;
+}
+
+/* called with rcu_read_lock() */
+static struct sock *inet6_lhash2_lookup(struct net *net,
+ struct inet_listen_hashbucket *ilb2,
+ struct sk_buff *skb, int doff,
+ const struct in6_addr *saddr,
+ const __be16 sport, const struct in6_addr *daddr,
+ const unsigned short hnum, const int dif, const int sdif)
+{
+ bool exact_dif = inet6_exact_dif_match(net, skb);
+ struct inet_connection_sock *icsk;
+ struct sock *sk, *result = NULL;
+ int score, hiscore = 0;
+ u32 phash = 0;
+
+ inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) {
+ sk = (struct sock *)icsk;
+ score = compute_score(sk, net, hnum, daddr, dif, sdif,
+ exact_dif);
+ if (score > hiscore) {
+ if (sk->sk_reuseport) {
+ phash = inet6_ehashfn(net, daddr, hnum,
+ saddr, sport);
+ result = reuseport_select_sock(sk, phash,
+ skb, doff);
+ if (result)
+ return result;
+ }
+ result = sk;
+ hiscore = score;
+ }
+ }
+
+ return result;
+}
+
+struct sock *inet6_lookup_listener(struct net *net,
+ struct inet_hashinfo *hashinfo,
+ struct sk_buff *skb, int doff,
+ const struct in6_addr *saddr,
+ const __be16 sport, const struct in6_addr *daddr,
+ const unsigned short hnum, const int dif, const int sdif)
+{
+ unsigned int hash = inet_lhashfn(net, hnum);
+ struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
+ bool exact_dif = inet6_exact_dif_match(net, skb);
+ struct inet_listen_hashbucket *ilb2;
+ struct sock *sk, *result = NULL;
+ int score, hiscore = 0;
+ unsigned int hash2;
+ u32 phash = 0;
+
+ if (ilb->count <= 10 || !hashinfo->lhash2)
+ goto port_lookup;
+
+ /* Too many sk in the ilb bucket (which is hashed by port alone).
+ * Try lhash2 (which is hashed by port and addr) instead.
+ */
+
+ hash2 = ipv6_portaddr_hash(net, daddr, hnum);
+ ilb2 = inet_lhash2_bucket(hashinfo, hash2);
+ if (ilb2->count > ilb->count)
+ goto port_lookup;
+
+ result = inet6_lhash2_lookup(net, ilb2, skb, doff,
+ saddr, sport, daddr, hnum,
+ dif, sdif);
+ if (result)
+ goto done;
+
+ /* Lookup lhash2 with in6addr_any */
+
+ hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
+ ilb2 = inet_lhash2_bucket(hashinfo, hash2);
+ if (ilb2->count > ilb->count)
+ goto port_lookup;
+
+ result = inet6_lhash2_lookup(net, ilb2, skb, doff,
+ saddr, sport, daddr, hnum,
+ dif, sdif);
+ goto done;
+
+port_lookup:
+ sk_for_each(sk, &ilb->head) {
+ score = compute_score(sk, net, hnum, daddr, dif, sdif, exact_dif);
+ if (score > hiscore) {
+ if (sk->sk_reuseport) {
+ phash = inet6_ehashfn(net, daddr, hnum,
+ saddr, sport);
+ result = reuseport_select_sock(sk, phash,
+ skb, doff);
+ if (result)
+ goto done;
+ }
+ result = sk;
+ hiscore = score;
+ }
+ }
+done:
+ if (unlikely(IS_ERR(result)))
+ return NULL;
+ return result;
+}
+EXPORT_SYMBOL_GPL(inet6_lookup_listener);
+
+struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
+ struct sk_buff *skb, int doff,
+ const struct in6_addr *saddr, const __be16 sport,
+ const struct in6_addr *daddr, const __be16 dport,
+ const int dif)
+{
+ struct sock *sk;
+ bool refcounted;
+
+ sk = __inet6_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
+ ntohs(dport), dif, 0, &refcounted);
+ if (sk && !refcounted && !refcount_inc_not_zero(&sk->sk_refcnt))
+ sk = NULL;
+ return sk;
+}
+EXPORT_SYMBOL_GPL(inet6_lookup);
+
+static int __inet6_check_established(struct inet_timewait_death_row *death_row,
+ struct sock *sk, const __u16 lport,
+ struct inet_timewait_sock **twp)
+{
+ struct inet_hashinfo *hinfo = death_row->hashinfo;
+ struct inet_sock *inet = inet_sk(sk);
+ const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr;
+ const struct in6_addr *saddr = &sk->sk_v6_daddr;
+ const int dif = sk->sk_bound_dev_if;
+ struct net *net = sock_net(sk);
+ const int sdif = l3mdev_master_ifindex_by_index(net, dif);
+ const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
+ const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr,
+ inet->inet_dport);
+ struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
+ spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
+ struct sock *sk2;
+ const struct hlist_nulls_node *node;
+ struct inet_timewait_sock *tw = NULL;
+
+ spin_lock(lock);
+
+ sk_nulls_for_each(sk2, node, &head->chain) {
+ if (sk2->sk_hash != hash)
+ continue;
+
+ if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports,
+ dif, sdif))) {
+ if (sk2->sk_state == TCP_TIME_WAIT) {
+ tw = inet_twsk(sk2);
+ if (twsk_unique(sk, sk2, twp))
+ break;
+ }
+ goto not_unique;
+ }
+ }
+
+ /* Must record num and sport now. Otherwise we will see
+ * in hash table socket with a funny identity.
+ */
+ inet->inet_num = lport;
+ inet->inet_sport = htons(lport);
+ sk->sk_hash = hash;
+ WARN_ON(!sk_unhashed(sk));
+ __sk_nulls_add_node_rcu(sk, &head->chain);
+ if (tw) {
+ sk_nulls_del_node_init_rcu((struct sock *)tw);
+ __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
+ }
+ spin_unlock(lock);
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+
+ if (twp) {
+ *twp = tw;
+ } else if (tw) {
+ /* Silly. Should hash-dance instead... */
+ inet_twsk_deschedule_put(tw);
+ }
+ return 0;
+
+not_unique:
+ spin_unlock(lock);
+ return -EADDRNOTAVAIL;
+}
+
+static u32 inet6_sk_port_offset(const struct sock *sk)
+{
+ const struct inet_sock *inet = inet_sk(sk);
+
+ return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32,
+ sk->sk_v6_daddr.s6_addr32,
+ inet->inet_dport);
+}
+
+int inet6_hash_connect(struct inet_timewait_death_row *death_row,
+ struct sock *sk)
+{
+ u32 port_offset = 0;
+
+ if (!inet_sk(sk)->inet_num)
+ port_offset = inet6_sk_port_offset(sk);
+ return __inet_hash_connect(death_row, sk, port_offset,
+ __inet6_check_established);
+}
+EXPORT_SYMBOL_GPL(inet6_hash_connect);
+
+int inet6_hash(struct sock *sk)
+{
+ int err = 0;
+
+ if (sk->sk_state != TCP_CLOSE) {
+ local_bh_disable();
+ err = __inet_hash(sk, NULL);
+ local_bh_enable();
+ }
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(inet6_hash);
diff --git a/net/ipv6/ip6_checksum.c b/net/ipv6/ip6_checksum.c
new file mode 100644
index 0000000..3777170
--- /dev/null
+++ b/net/ipv6/ip6_checksum.c
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <net/ip.h>
+#include <net/udp.h>
+#include <net/udplite.h>
+#include <asm/checksum.h>
+
+#ifndef _HAVE_ARCH_IPV6_CSUM
+__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ __u32 len, __u8 proto, __wsum csum)
+{
+
+ int carry;
+ __u32 ulen;
+ __u32 uproto;
+ __u32 sum = (__force u32)csum;
+
+ sum += (__force u32)saddr->s6_addr32[0];
+ carry = (sum < (__force u32)saddr->s6_addr32[0]);
+ sum += carry;
+
+ sum += (__force u32)saddr->s6_addr32[1];
+ carry = (sum < (__force u32)saddr->s6_addr32[1]);
+ sum += carry;
+
+ sum += (__force u32)saddr->s6_addr32[2];
+ carry = (sum < (__force u32)saddr->s6_addr32[2]);
+ sum += carry;
+
+ sum += (__force u32)saddr->s6_addr32[3];
+ carry = (sum < (__force u32)saddr->s6_addr32[3]);
+ sum += carry;
+
+ sum += (__force u32)daddr->s6_addr32[0];
+ carry = (sum < (__force u32)daddr->s6_addr32[0]);
+ sum += carry;
+
+ sum += (__force u32)daddr->s6_addr32[1];
+ carry = (sum < (__force u32)daddr->s6_addr32[1]);
+ sum += carry;
+
+ sum += (__force u32)daddr->s6_addr32[2];
+ carry = (sum < (__force u32)daddr->s6_addr32[2]);
+ sum += carry;
+
+ sum += (__force u32)daddr->s6_addr32[3];
+ carry = (sum < (__force u32)daddr->s6_addr32[3]);
+ sum += carry;
+
+ ulen = (__force u32)htonl((__u32) len);
+ sum += ulen;
+ carry = (sum < ulen);
+ sum += carry;
+
+ uproto = (__force u32)htonl(proto);
+ sum += uproto;
+ carry = (sum < uproto);
+ sum += carry;
+
+ return csum_fold((__force __wsum)sum);
+}
+EXPORT_SYMBOL(csum_ipv6_magic);
+#endif
+
+int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
+{
+ int err;
+
+ UDP_SKB_CB(skb)->partial_cov = 0;
+ UDP_SKB_CB(skb)->cscov = skb->len;
+
+ if (proto == IPPROTO_UDPLITE) {
+ err = udplite_checksum_init(skb, uh);
+ if (err)
+ return err;
+
+ if (UDP_SKB_CB(skb)->partial_cov) {
+ skb->csum = ip6_compute_pseudo(skb, proto);
+ return 0;
+ }
+ }
+
+ /* To support RFC 6936 (allow zero checksum in UDP/IPV6 for tunnels)
+ * we accept a checksum of zero here. When we find the socket
+ * for the UDP packet we'll check if that socket allows zero checksum
+ * for IPv6 (set by socket option).
+ *
+ * Note, we are only interested in != 0 or == 0, thus the
+ * force to int.
+ */
+ err = (__force int)skb_checksum_init_zero_check(skb, proto, uh->check,
+ ip6_compute_pseudo);
+ if (err)
+ return err;
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE && !skb->csum_valid) {
+ /* If SW calculated the value, we know it's bad */
+ if (skb->csum_complete_sw)
+ return 1;
+
+ /* HW says the value is bad. Let's validate that.
+ * skb->csum is no longer the full packet checksum,
+ * so don't treat is as such.
+ */
+ skb_checksum_complete_unset(skb);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(udp6_csum_init);
+
+/* Function to set UDP checksum for an IPv6 UDP packet. This is intended
+ * for the simple case like when setting the checksum for a UDP tunnel.
+ */
+void udp6_set_csum(bool nocheck, struct sk_buff *skb,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr, int len)
+{
+ struct udphdr *uh = udp_hdr(skb);
+
+ if (nocheck)
+ uh->check = 0;
+ else if (skb_is_gso(skb))
+ uh->check = ~udp_v6_check(len, saddr, daddr, 0);
+ else if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ uh->check = 0;
+ uh->check = udp_v6_check(len, saddr, daddr, lco_csum(skb));
+ if (uh->check == 0)
+ uh->check = CSUM_MANGLED_0;
+ } else {
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ skb->csum_start = skb_transport_header(skb) - skb->head;
+ skb->csum_offset = offsetof(struct udphdr, check);
+ uh->check = ~udp_v6_check(len, saddr, daddr, 0);
+ }
+}
+EXPORT_SYMBOL(udp6_set_csum);
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
new file mode 100644
index 0000000..cbe4617
--- /dev/null
+++ b/net/ipv6/ip6_fib.c
@@ -0,0 +1,2427 @@
+/*
+ * Linux INET6 implementation
+ * Forwarding Information Database
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Changes:
+ * Yuji SEKIYA @USAGI: Support default route on router node;
+ * remove ip6_null_entry from the top of
+ * routing table.
+ * Ville Nuorvala: Fixed routing subtrees.
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/net.h>
+#include <linux/route.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/lwtunnel.h>
+#include <net/fib_notifier.h>
+
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+
+static struct kmem_cache *fib6_node_kmem __read_mostly;
+
+struct fib6_cleaner {
+ struct fib6_walker w;
+ struct net *net;
+ int (*func)(struct fib6_info *, void *arg);
+ int sernum;
+ void *arg;
+};
+
+#ifdef CONFIG_IPV6_SUBTREES
+#define FWS_INIT FWS_S
+#else
+#define FWS_INIT FWS_L
+#endif
+
+static struct fib6_info *fib6_find_prefix(struct net *net,
+ struct fib6_table *table,
+ struct fib6_node *fn);
+static struct fib6_node *fib6_repair_tree(struct net *net,
+ struct fib6_table *table,
+ struct fib6_node *fn);
+static int fib6_walk(struct net *net, struct fib6_walker *w);
+static int fib6_walk_continue(struct fib6_walker *w);
+
+/*
+ * A routing update causes an increase of the serial number on the
+ * affected subtree. This allows for cached routes to be asynchronously
+ * tested when modifications are made to the destination cache as a
+ * result of redirects, path MTU changes, etc.
+ */
+
+static void fib6_gc_timer_cb(struct timer_list *t);
+
+#define FOR_WALKERS(net, w) \
+ list_for_each_entry(w, &(net)->ipv6.fib6_walkers, lh)
+
+static void fib6_walker_link(struct net *net, struct fib6_walker *w)
+{
+ write_lock_bh(&net->ipv6.fib6_walker_lock);
+ list_add(&w->lh, &net->ipv6.fib6_walkers);
+ write_unlock_bh(&net->ipv6.fib6_walker_lock);
+}
+
+static void fib6_walker_unlink(struct net *net, struct fib6_walker *w)
+{
+ write_lock_bh(&net->ipv6.fib6_walker_lock);
+ list_del(&w->lh);
+ write_unlock_bh(&net->ipv6.fib6_walker_lock);
+}
+
+static int fib6_new_sernum(struct net *net)
+{
+ int new, old;
+
+ do {
+ old = atomic_read(&net->ipv6.fib6_sernum);
+ new = old < INT_MAX ? old + 1 : 1;
+ } while (atomic_cmpxchg(&net->ipv6.fib6_sernum,
+ old, new) != old);
+ return new;
+}
+
+enum {
+ FIB6_NO_SERNUM_CHANGE = 0,
+};
+
+void fib6_update_sernum(struct net *net, struct fib6_info *f6i)
+{
+ struct fib6_node *fn;
+
+ fn = rcu_dereference_protected(f6i->fib6_node,
+ lockdep_is_held(&f6i->fib6_table->tb6_lock));
+ if (fn)
+ fn->fn_sernum = fib6_new_sernum(net);
+}
+
+/*
+ * Auxiliary address test functions for the radix tree.
+ *
+ * These assume a 32bit processor (although it will work on
+ * 64bit processors)
+ */
+
+/*
+ * test bit
+ */
+#if defined(__LITTLE_ENDIAN)
+# define BITOP_BE32_SWIZZLE (0x1F & ~7)
+#else
+# define BITOP_BE32_SWIZZLE 0
+#endif
+
+static __be32 addr_bit_set(const void *token, int fn_bit)
+{
+ const __be32 *addr = token;
+ /*
+ * Here,
+ * 1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)
+ * is optimized version of
+ * htonl(1 << ((~fn_bit)&0x1F))
+ * See include/asm-generic/bitops/le.h.
+ */
+ return (__force __be32)(1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)) &
+ addr[fn_bit >> 5];
+}
+
+struct fib6_info *fib6_info_alloc(gfp_t gfp_flags)
+{
+ struct fib6_info *f6i;
+
+ f6i = kzalloc(sizeof(*f6i), gfp_flags);
+ if (!f6i)
+ return NULL;
+
+ f6i->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
+ if (!f6i->rt6i_pcpu) {
+ kfree(f6i);
+ return NULL;
+ }
+
+ INIT_LIST_HEAD(&f6i->fib6_siblings);
+ f6i->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
+
+ atomic_inc(&f6i->fib6_ref);
+
+ return f6i;
+}
+
+void fib6_info_destroy_rcu(struct rcu_head *head)
+{
+ struct fib6_info *f6i = container_of(head, struct fib6_info, rcu);
+ struct rt6_exception_bucket *bucket;
+ struct dst_metrics *m;
+
+ WARN_ON(f6i->fib6_node);
+
+ bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket, 1);
+ if (bucket) {
+ f6i->rt6i_exception_bucket = NULL;
+ kfree(bucket);
+ }
+
+ if (f6i->rt6i_pcpu) {
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ struct rt6_info **ppcpu_rt;
+ struct rt6_info *pcpu_rt;
+
+ ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu);
+ pcpu_rt = *ppcpu_rt;
+ if (pcpu_rt) {
+ dst_dev_put(&pcpu_rt->dst);
+ dst_release(&pcpu_rt->dst);
+ *ppcpu_rt = NULL;
+ }
+ }
+
+ free_percpu(f6i->rt6i_pcpu);
+ }
+
+ lwtstate_put(f6i->fib6_nh.nh_lwtstate);
+
+ if (f6i->fib6_nh.nh_dev)
+ dev_put(f6i->fib6_nh.nh_dev);
+
+ m = f6i->fib6_metrics;
+ if (m != &dst_default_metrics && refcount_dec_and_test(&m->refcnt))
+ kfree(m);
+
+ kfree(f6i);
+}
+EXPORT_SYMBOL_GPL(fib6_info_destroy_rcu);
+
+static struct fib6_node *node_alloc(struct net *net)
+{
+ struct fib6_node *fn;
+
+ fn = kmem_cache_zalloc(fib6_node_kmem, GFP_ATOMIC);
+ if (fn)
+ net->ipv6.rt6_stats->fib_nodes++;
+
+ return fn;
+}
+
+static void node_free_immediate(struct net *net, struct fib6_node *fn)
+{
+ kmem_cache_free(fib6_node_kmem, fn);
+ net->ipv6.rt6_stats->fib_nodes--;
+}
+
+static void node_free_rcu(struct rcu_head *head)
+{
+ struct fib6_node *fn = container_of(head, struct fib6_node, rcu);
+
+ kmem_cache_free(fib6_node_kmem, fn);
+}
+
+static void node_free(struct net *net, struct fib6_node *fn)
+{
+ call_rcu(&fn->rcu, node_free_rcu);
+ net->ipv6.rt6_stats->fib_nodes--;
+}
+
+static void fib6_free_table(struct fib6_table *table)
+{
+ inetpeer_invalidate_tree(&table->tb6_peers);
+ kfree(table);
+}
+
+static void fib6_link_table(struct net *net, struct fib6_table *tb)
+{
+ unsigned int h;
+
+ /*
+ * Initialize table lock at a single place to give lockdep a key,
+ * tables aren't visible prior to being linked to the list.
+ */
+ spin_lock_init(&tb->tb6_lock);
+ h = tb->tb6_id & (FIB6_TABLE_HASHSZ - 1);
+
+ /*
+ * No protection necessary, this is the only list mutatation
+ * operation, tables never disappear once they exist.
+ */
+ hlist_add_head_rcu(&tb->tb6_hlist, &net->ipv6.fib_table_hash[h]);
+}
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+
+static struct fib6_table *fib6_alloc_table(struct net *net, u32 id)
+{
+ struct fib6_table *table;
+
+ table = kzalloc(sizeof(*table), GFP_ATOMIC);
+ if (table) {
+ table->tb6_id = id;
+ rcu_assign_pointer(table->tb6_root.leaf,
+ net->ipv6.fib6_null_entry);
+ table->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO;
+ inet_peer_base_init(&table->tb6_peers);
+ }
+
+ return table;
+}
+
+struct fib6_table *fib6_new_table(struct net *net, u32 id)
+{
+ struct fib6_table *tb;
+
+ if (id == 0)
+ id = RT6_TABLE_MAIN;
+ tb = fib6_get_table(net, id);
+ if (tb)
+ return tb;
+
+ tb = fib6_alloc_table(net, id);
+ if (tb)
+ fib6_link_table(net, tb);
+
+ return tb;
+}
+EXPORT_SYMBOL_GPL(fib6_new_table);
+
+struct fib6_table *fib6_get_table(struct net *net, u32 id)
+{
+ struct fib6_table *tb;
+ struct hlist_head *head;
+ unsigned int h;
+
+ if (id == 0)
+ id = RT6_TABLE_MAIN;
+ h = id & (FIB6_TABLE_HASHSZ - 1);
+ rcu_read_lock();
+ head = &net->ipv6.fib_table_hash[h];
+ hlist_for_each_entry_rcu(tb, head, tb6_hlist) {
+ if (tb->tb6_id == id) {
+ rcu_read_unlock();
+ return tb;
+ }
+ }
+ rcu_read_unlock();
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(fib6_get_table);
+
+static void __net_init fib6_tables_init(struct net *net)
+{
+ fib6_link_table(net, net->ipv6.fib6_main_tbl);
+ fib6_link_table(net, net->ipv6.fib6_local_tbl);
+}
+#else
+
+struct fib6_table *fib6_new_table(struct net *net, u32 id)
+{
+ return fib6_get_table(net, id);
+}
+
+struct fib6_table *fib6_get_table(struct net *net, u32 id)
+{
+ return net->ipv6.fib6_main_tbl;
+}
+
+struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
+ const struct sk_buff *skb,
+ int flags, pol_lookup_t lookup)
+{
+ struct rt6_info *rt;
+
+ rt = lookup(net, net->ipv6.fib6_main_tbl, fl6, skb, flags);
+ if (rt->dst.error == -EAGAIN) {
+ ip6_rt_put(rt);
+ rt = net->ipv6.ip6_null_entry;
+ dst_hold(&rt->dst);
+ }
+
+ return &rt->dst;
+}
+
+/* called with rcu lock held; no reference taken on fib6_info */
+struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
+ int flags)
+{
+ return fib6_table_lookup(net, net->ipv6.fib6_main_tbl, oif, fl6, flags);
+}
+
+static void __net_init fib6_tables_init(struct net *net)
+{
+ fib6_link_table(net, net->ipv6.fib6_main_tbl);
+}
+
+#endif
+
+unsigned int fib6_tables_seq_read(struct net *net)
+{
+ unsigned int h, fib_seq = 0;
+
+ rcu_read_lock();
+ for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
+ struct hlist_head *head = &net->ipv6.fib_table_hash[h];
+ struct fib6_table *tb;
+
+ hlist_for_each_entry_rcu(tb, head, tb6_hlist)
+ fib_seq += tb->fib_seq;
+ }
+ rcu_read_unlock();
+
+ return fib_seq;
+}
+
+static int call_fib6_entry_notifier(struct notifier_block *nb, struct net *net,
+ enum fib_event_type event_type,
+ struct fib6_info *rt)
+{
+ struct fib6_entry_notifier_info info = {
+ .rt = rt,
+ };
+
+ return call_fib6_notifier(nb, net, event_type, &info.info);
+}
+
+static int call_fib6_entry_notifiers(struct net *net,
+ enum fib_event_type event_type,
+ struct fib6_info *rt,
+ struct netlink_ext_ack *extack)
+{
+ struct fib6_entry_notifier_info info = {
+ .info.extack = extack,
+ .rt = rt,
+ };
+
+ rt->fib6_table->fib_seq++;
+ return call_fib6_notifiers(net, event_type, &info.info);
+}
+
+struct fib6_dump_arg {
+ struct net *net;
+ struct notifier_block *nb;
+};
+
+static void fib6_rt_dump(struct fib6_info *rt, struct fib6_dump_arg *arg)
+{
+ if (rt == arg->net->ipv6.fib6_null_entry)
+ return;
+ call_fib6_entry_notifier(arg->nb, arg->net, FIB_EVENT_ENTRY_ADD, rt);
+}
+
+static int fib6_node_dump(struct fib6_walker *w)
+{
+ struct fib6_info *rt;
+
+ for_each_fib6_walker_rt(w)
+ fib6_rt_dump(rt, w->args);
+ w->leaf = NULL;
+ return 0;
+}
+
+static void fib6_table_dump(struct net *net, struct fib6_table *tb,
+ struct fib6_walker *w)
+{
+ w->root = &tb->tb6_root;
+ spin_lock_bh(&tb->tb6_lock);
+ fib6_walk(net, w);
+ spin_unlock_bh(&tb->tb6_lock);
+}
+
+/* Called with rcu_read_lock() */
+int fib6_tables_dump(struct net *net, struct notifier_block *nb)
+{
+ struct fib6_dump_arg arg;
+ struct fib6_walker *w;
+ unsigned int h;
+
+ w = kzalloc(sizeof(*w), GFP_ATOMIC);
+ if (!w)
+ return -ENOMEM;
+
+ w->func = fib6_node_dump;
+ arg.net = net;
+ arg.nb = nb;
+ w->args = &arg;
+
+ for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
+ struct hlist_head *head = &net->ipv6.fib_table_hash[h];
+ struct fib6_table *tb;
+
+ hlist_for_each_entry_rcu(tb, head, tb6_hlist)
+ fib6_table_dump(net, tb, w);
+ }
+
+ kfree(w);
+
+ return 0;
+}
+
+static int fib6_dump_node(struct fib6_walker *w)
+{
+ int res;
+ struct fib6_info *rt;
+
+ for_each_fib6_walker_rt(w) {
+ res = rt6_dump_route(rt, w->args);
+ if (res < 0) {
+ /* Frame is full, suspend walking */
+ w->leaf = rt;
+ return 1;
+ }
+
+ /* Multipath routes are dumped in one route with the
+ * RTA_MULTIPATH attribute. Jump 'rt' to point to the
+ * last sibling of this route (no need to dump the
+ * sibling routes again)
+ */
+ if (rt->fib6_nsiblings)
+ rt = list_last_entry(&rt->fib6_siblings,
+ struct fib6_info,
+ fib6_siblings);
+ }
+ w->leaf = NULL;
+ return 0;
+}
+
+static void fib6_dump_end(struct netlink_callback *cb)
+{
+ struct net *net = sock_net(cb->skb->sk);
+ struct fib6_walker *w = (void *)cb->args[2];
+
+ if (w) {
+ if (cb->args[4]) {
+ cb->args[4] = 0;
+ fib6_walker_unlink(net, w);
+ }
+ cb->args[2] = 0;
+ kfree(w);
+ }
+ cb->done = (void *)cb->args[3];
+ cb->args[1] = 3;
+}
+
+static int fib6_dump_done(struct netlink_callback *cb)
+{
+ fib6_dump_end(cb);
+ return cb->done ? cb->done(cb) : 0;
+}
+
+static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct fib6_walker *w;
+ int res;
+
+ w = (void *)cb->args[2];
+ w->root = &table->tb6_root;
+
+ if (cb->args[4] == 0) {
+ w->count = 0;
+ w->skip = 0;
+
+ spin_lock_bh(&table->tb6_lock);
+ res = fib6_walk(net, w);
+ spin_unlock_bh(&table->tb6_lock);
+ if (res > 0) {
+ cb->args[4] = 1;
+ cb->args[5] = w->root->fn_sernum;
+ }
+ } else {
+ if (cb->args[5] != w->root->fn_sernum) {
+ /* Begin at the root if the tree changed */
+ cb->args[5] = w->root->fn_sernum;
+ w->state = FWS_INIT;
+ w->node = w->root;
+ w->skip = w->count;
+ } else
+ w->skip = 0;
+
+ spin_lock_bh(&table->tb6_lock);
+ res = fib6_walk_continue(w);
+ spin_unlock_bh(&table->tb6_lock);
+ if (res <= 0) {
+ fib6_walker_unlink(net, w);
+ cb->args[4] = 0;
+ }
+ }
+
+ return res;
+}
+
+static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ unsigned int h, s_h;
+ unsigned int e = 0, s_e;
+ struct rt6_rtnl_dump_arg arg;
+ struct fib6_walker *w;
+ struct fib6_table *tb;
+ struct hlist_head *head;
+ int res = 0;
+
+ s_h = cb->args[0];
+ s_e = cb->args[1];
+
+ w = (void *)cb->args[2];
+ if (!w) {
+ /* New dump:
+ *
+ * 1. hook callback destructor.
+ */
+ cb->args[3] = (long)cb->done;
+ cb->done = fib6_dump_done;
+
+ /*
+ * 2. allocate and initialize walker.
+ */
+ w = kzalloc(sizeof(*w), GFP_ATOMIC);
+ if (!w)
+ return -ENOMEM;
+ w->func = fib6_dump_node;
+ cb->args[2] = (long)w;
+ }
+
+ arg.skb = skb;
+ arg.cb = cb;
+ arg.net = net;
+ w->args = &arg;
+
+ rcu_read_lock();
+ for (h = s_h; h < FIB6_TABLE_HASHSZ; h++, s_e = 0) {
+ e = 0;
+ head = &net->ipv6.fib_table_hash[h];
+ hlist_for_each_entry_rcu(tb, head, tb6_hlist) {
+ if (e < s_e)
+ goto next;
+ res = fib6_dump_table(tb, skb, cb);
+ if (res != 0)
+ goto out;
+next:
+ e++;
+ }
+ }
+out:
+ rcu_read_unlock();
+ cb->args[1] = e;
+ cb->args[0] = h;
+
+ res = res < 0 ? res : skb->len;
+ if (res <= 0)
+ fib6_dump_end(cb);
+ return res;
+}
+
+void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val)
+{
+ if (!f6i)
+ return;
+
+ if (f6i->fib6_metrics == &dst_default_metrics) {
+ struct dst_metrics *p = kzalloc(sizeof(*p), GFP_ATOMIC);
+
+ if (!p)
+ return;
+
+ refcount_set(&p->refcnt, 1);
+ f6i->fib6_metrics = p;
+ }
+
+ f6i->fib6_metrics->metrics[metric - 1] = val;
+}
+
+/*
+ * Routing Table
+ *
+ * return the appropriate node for a routing tree "add" operation
+ * by either creating and inserting or by returning an existing
+ * node.
+ */
+
+static struct fib6_node *fib6_add_1(struct net *net,
+ struct fib6_table *table,
+ struct fib6_node *root,
+ struct in6_addr *addr, int plen,
+ int offset, int allow_create,
+ int replace_required,
+ struct netlink_ext_ack *extack)
+{
+ struct fib6_node *fn, *in, *ln;
+ struct fib6_node *pn = NULL;
+ struct rt6key *key;
+ int bit;
+ __be32 dir = 0;
+
+ RT6_TRACE("fib6_add_1\n");
+
+ /* insert node in tree */
+
+ fn = root;
+
+ do {
+ struct fib6_info *leaf = rcu_dereference_protected(fn->leaf,
+ lockdep_is_held(&table->tb6_lock));
+ key = (struct rt6key *)((u8 *)leaf + offset);
+
+ /*
+ * Prefix match
+ */
+ if (plen < fn->fn_bit ||
+ !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) {
+ if (!allow_create) {
+ if (replace_required) {
+ NL_SET_ERR_MSG(extack,
+ "Can not replace route - no match found");
+ pr_warn("Can't replace route, no match found\n");
+ return ERR_PTR(-ENOENT);
+ }
+ pr_warn("NLM_F_CREATE should be set when creating new route\n");
+ }
+ goto insert_above;
+ }
+
+ /*
+ * Exact match ?
+ */
+
+ if (plen == fn->fn_bit) {
+ /* clean up an intermediate node */
+ if (!(fn->fn_flags & RTN_RTINFO)) {
+ RCU_INIT_POINTER(fn->leaf, NULL);
+ fib6_info_release(leaf);
+ /* remove null_entry in the root node */
+ } else if (fn->fn_flags & RTN_TL_ROOT &&
+ rcu_access_pointer(fn->leaf) ==
+ net->ipv6.fib6_null_entry) {
+ RCU_INIT_POINTER(fn->leaf, NULL);
+ }
+
+ return fn;
+ }
+
+ /*
+ * We have more bits to go
+ */
+
+ /* Try to walk down on tree. */
+ dir = addr_bit_set(addr, fn->fn_bit);
+ pn = fn;
+ fn = dir ?
+ rcu_dereference_protected(fn->right,
+ lockdep_is_held(&table->tb6_lock)) :
+ rcu_dereference_protected(fn->left,
+ lockdep_is_held(&table->tb6_lock));
+ } while (fn);
+
+ if (!allow_create) {
+ /* We should not create new node because
+ * NLM_F_REPLACE was specified without NLM_F_CREATE
+ * I assume it is safe to require NLM_F_CREATE when
+ * REPLACE flag is used! Later we may want to remove the
+ * check for replace_required, because according
+ * to netlink specification, NLM_F_CREATE
+ * MUST be specified if new route is created.
+ * That would keep IPv6 consistent with IPv4
+ */
+ if (replace_required) {
+ NL_SET_ERR_MSG(extack,
+ "Can not replace route - no match found");
+ pr_warn("Can't replace route, no match found\n");
+ return ERR_PTR(-ENOENT);
+ }
+ pr_warn("NLM_F_CREATE should be set when creating new route\n");
+ }
+ /*
+ * We walked to the bottom of tree.
+ * Create new leaf node without children.
+ */
+
+ ln = node_alloc(net);
+
+ if (!ln)
+ return ERR_PTR(-ENOMEM);
+ ln->fn_bit = plen;
+ RCU_INIT_POINTER(ln->parent, pn);
+
+ if (dir)
+ rcu_assign_pointer(pn->right, ln);
+ else
+ rcu_assign_pointer(pn->left, ln);
+
+ return ln;
+
+
+insert_above:
+ /*
+ * split since we don't have a common prefix anymore or
+ * we have a less significant route.
+ * we've to insert an intermediate node on the list
+ * this new node will point to the one we need to create
+ * and the current
+ */
+
+ pn = rcu_dereference_protected(fn->parent,
+ lockdep_is_held(&table->tb6_lock));
+
+ /* find 1st bit in difference between the 2 addrs.
+
+ See comment in __ipv6_addr_diff: bit may be an invalid value,
+ but if it is >= plen, the value is ignored in any case.
+ */
+
+ bit = __ipv6_addr_diff(addr, &key->addr, sizeof(*addr));
+
+ /*
+ * (intermediate)[in]
+ * / \
+ * (new leaf node)[ln] (old node)[fn]
+ */
+ if (plen > bit) {
+ in = node_alloc(net);
+ ln = node_alloc(net);
+
+ if (!in || !ln) {
+ if (in)
+ node_free_immediate(net, in);
+ if (ln)
+ node_free_immediate(net, ln);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ /*
+ * new intermediate node.
+ * RTN_RTINFO will
+ * be off since that an address that chooses one of
+ * the branches would not match less specific routes
+ * in the other branch
+ */
+
+ in->fn_bit = bit;
+
+ RCU_INIT_POINTER(in->parent, pn);
+ in->leaf = fn->leaf;
+ atomic_inc(&rcu_dereference_protected(in->leaf,
+ lockdep_is_held(&table->tb6_lock))->fib6_ref);
+
+ /* update parent pointer */
+ if (dir)
+ rcu_assign_pointer(pn->right, in);
+ else
+ rcu_assign_pointer(pn->left, in);
+
+ ln->fn_bit = plen;
+
+ RCU_INIT_POINTER(ln->parent, in);
+ rcu_assign_pointer(fn->parent, in);
+
+ if (addr_bit_set(addr, bit)) {
+ rcu_assign_pointer(in->right, ln);
+ rcu_assign_pointer(in->left, fn);
+ } else {
+ rcu_assign_pointer(in->left, ln);
+ rcu_assign_pointer(in->right, fn);
+ }
+ } else { /* plen <= bit */
+
+ /*
+ * (new leaf node)[ln]
+ * / \
+ * (old node)[fn] NULL
+ */
+
+ ln = node_alloc(net);
+
+ if (!ln)
+ return ERR_PTR(-ENOMEM);
+
+ ln->fn_bit = plen;
+
+ RCU_INIT_POINTER(ln->parent, pn);
+
+ if (addr_bit_set(&key->addr, plen))
+ RCU_INIT_POINTER(ln->right, fn);
+ else
+ RCU_INIT_POINTER(ln->left, fn);
+
+ rcu_assign_pointer(fn->parent, ln);
+
+ if (dir)
+ rcu_assign_pointer(pn->right, ln);
+ else
+ rcu_assign_pointer(pn->left, ln);
+ }
+ return ln;
+}
+
+static void fib6_drop_pcpu_from(struct fib6_info *f6i,
+ const struct fib6_table *table)
+{
+ int cpu;
+
+ /* release the reference to this fib entry from
+ * all of its cached pcpu routes
+ */
+ for_each_possible_cpu(cpu) {
+ struct rt6_info **ppcpu_rt;
+ struct rt6_info *pcpu_rt;
+
+ ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu);
+ pcpu_rt = *ppcpu_rt;
+ if (pcpu_rt) {
+ struct fib6_info *from;
+
+ from = rcu_dereference_protected(pcpu_rt->from,
+ lockdep_is_held(&table->tb6_lock));
+ rcu_assign_pointer(pcpu_rt->from, NULL);
+ fib6_info_release(from);
+ }
+ }
+}
+
+static void fib6_purge_rt(struct fib6_info *rt, struct fib6_node *fn,
+ struct net *net)
+{
+ struct fib6_table *table = rt->fib6_table;
+
+ if (atomic_read(&rt->fib6_ref) != 1) {
+ /* This route is used as dummy address holder in some split
+ * nodes. It is not leaked, but it still holds other resources,
+ * which must be released in time. So, scan ascendant nodes
+ * and replace dummy references to this route with references
+ * to still alive ones.
+ */
+ while (fn) {
+ struct fib6_info *leaf = rcu_dereference_protected(fn->leaf,
+ lockdep_is_held(&table->tb6_lock));
+ struct fib6_info *new_leaf;
+ if (!(fn->fn_flags & RTN_RTINFO) && leaf == rt) {
+ new_leaf = fib6_find_prefix(net, table, fn);
+ atomic_inc(&new_leaf->fib6_ref);
+
+ rcu_assign_pointer(fn->leaf, new_leaf);
+ fib6_info_release(rt);
+ }
+ fn = rcu_dereference_protected(fn->parent,
+ lockdep_is_held(&table->tb6_lock));
+ }
+
+ if (rt->rt6i_pcpu)
+ fib6_drop_pcpu_from(rt, table);
+ }
+}
+
+/*
+ * Insert routing information in a node.
+ */
+
+static int fib6_add_rt2node(struct fib6_node *fn, struct fib6_info *rt,
+ struct nl_info *info,
+ struct netlink_ext_ack *extack)
+{
+ struct fib6_info *leaf = rcu_dereference_protected(fn->leaf,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ struct fib6_info *iter = NULL;
+ struct fib6_info __rcu **ins;
+ struct fib6_info __rcu **fallback_ins = NULL;
+ int replace = (info->nlh &&
+ (info->nlh->nlmsg_flags & NLM_F_REPLACE));
+ int add = (!info->nlh ||
+ (info->nlh->nlmsg_flags & NLM_F_CREATE));
+ int found = 0;
+ bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
+ u16 nlflags = NLM_F_EXCL;
+ int err;
+
+ if (info->nlh && (info->nlh->nlmsg_flags & NLM_F_APPEND))
+ nlflags |= NLM_F_APPEND;
+
+ ins = &fn->leaf;
+
+ for (iter = leaf; iter;
+ iter = rcu_dereference_protected(iter->fib6_next,
+ lockdep_is_held(&rt->fib6_table->tb6_lock))) {
+ /*
+ * Search for duplicates
+ */
+
+ if (iter->fib6_metric == rt->fib6_metric) {
+ /*
+ * Same priority level
+ */
+ if (info->nlh &&
+ (info->nlh->nlmsg_flags & NLM_F_EXCL))
+ return -EEXIST;
+
+ nlflags &= ~NLM_F_EXCL;
+ if (replace) {
+ if (rt_can_ecmp == rt6_qualify_for_ecmp(iter)) {
+ found++;
+ break;
+ }
+ if (rt_can_ecmp)
+ fallback_ins = fallback_ins ?: ins;
+ goto next_iter;
+ }
+
+ if (rt6_duplicate_nexthop(iter, rt)) {
+ if (rt->fib6_nsiblings)
+ rt->fib6_nsiblings = 0;
+ if (!(iter->fib6_flags & RTF_EXPIRES))
+ return -EEXIST;
+ if (!(rt->fib6_flags & RTF_EXPIRES))
+ fib6_clean_expires(iter);
+ else
+ fib6_set_expires(iter, rt->expires);
+
+ if (rt->fib6_pmtu)
+ fib6_metric_set(iter, RTAX_MTU,
+ rt->fib6_pmtu);
+ return -EEXIST;
+ }
+ /* If we have the same destination and the same metric,
+ * but not the same gateway, then the route we try to
+ * add is sibling to this route, increment our counter
+ * of siblings, and later we will add our route to the
+ * list.
+ * Only static routes (which don't have flag
+ * RTF_EXPIRES) are used for ECMPv6.
+ *
+ * To avoid long list, we only had siblings if the
+ * route have a gateway.
+ */
+ if (rt_can_ecmp &&
+ rt6_qualify_for_ecmp(iter))
+ rt->fib6_nsiblings++;
+ }
+
+ if (iter->fib6_metric > rt->fib6_metric)
+ break;
+
+next_iter:
+ ins = &iter->fib6_next;
+ }
+
+ if (fallback_ins && !found) {
+ /* No ECMP-able route found, replace first non-ECMP one */
+ ins = fallback_ins;
+ iter = rcu_dereference_protected(*ins,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ found++;
+ }
+
+ /* Reset round-robin state, if necessary */
+ if (ins == &fn->leaf)
+ fn->rr_ptr = NULL;
+
+ /* Link this route to others same route. */
+ if (rt->fib6_nsiblings) {
+ unsigned int fib6_nsiblings;
+ struct fib6_info *sibling, *temp_sibling;
+
+ /* Find the first route that have the same metric */
+ sibling = leaf;
+ while (sibling) {
+ if (sibling->fib6_metric == rt->fib6_metric &&
+ rt6_qualify_for_ecmp(sibling)) {
+ list_add_tail(&rt->fib6_siblings,
+ &sibling->fib6_siblings);
+ break;
+ }
+ sibling = rcu_dereference_protected(sibling->fib6_next,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ }
+ /* For each sibling in the list, increment the counter of
+ * siblings. BUG() if counters does not match, list of siblings
+ * is broken!
+ */
+ fib6_nsiblings = 0;
+ list_for_each_entry_safe(sibling, temp_sibling,
+ &rt->fib6_siblings, fib6_siblings) {
+ sibling->fib6_nsiblings++;
+ BUG_ON(sibling->fib6_nsiblings != rt->fib6_nsiblings);
+ fib6_nsiblings++;
+ }
+ BUG_ON(fib6_nsiblings != rt->fib6_nsiblings);
+ rt6_multipath_rebalance(temp_sibling);
+ }
+
+ /*
+ * insert node
+ */
+ if (!replace) {
+ if (!add)
+ pr_warn("NLM_F_CREATE should be set when creating new route\n");
+
+add:
+ nlflags |= NLM_F_CREATE;
+
+ err = call_fib6_entry_notifiers(info->nl_net,
+ FIB_EVENT_ENTRY_ADD,
+ rt, extack);
+ if (err)
+ return err;
+
+ rcu_assign_pointer(rt->fib6_next, iter);
+ atomic_inc(&rt->fib6_ref);
+ rcu_assign_pointer(rt->fib6_node, fn);
+ rcu_assign_pointer(*ins, rt);
+ if (!info->skip_notify)
+ inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
+ info->nl_net->ipv6.rt6_stats->fib_rt_entries++;
+
+ if (!(fn->fn_flags & RTN_RTINFO)) {
+ info->nl_net->ipv6.rt6_stats->fib_route_nodes++;
+ fn->fn_flags |= RTN_RTINFO;
+ }
+
+ } else {
+ int nsiblings;
+
+ if (!found) {
+ if (add)
+ goto add;
+ pr_warn("NLM_F_REPLACE set, but no existing node found!\n");
+ return -ENOENT;
+ }
+
+ err = call_fib6_entry_notifiers(info->nl_net,
+ FIB_EVENT_ENTRY_REPLACE,
+ rt, extack);
+ if (err)
+ return err;
+
+ atomic_inc(&rt->fib6_ref);
+ rcu_assign_pointer(rt->fib6_node, fn);
+ rt->fib6_next = iter->fib6_next;
+ rcu_assign_pointer(*ins, rt);
+ if (!info->skip_notify)
+ inet6_rt_notify(RTM_NEWROUTE, rt, info, NLM_F_REPLACE);
+ if (!(fn->fn_flags & RTN_RTINFO)) {
+ info->nl_net->ipv6.rt6_stats->fib_route_nodes++;
+ fn->fn_flags |= RTN_RTINFO;
+ }
+ nsiblings = iter->fib6_nsiblings;
+ iter->fib6_node = NULL;
+ fib6_purge_rt(iter, fn, info->nl_net);
+ if (rcu_access_pointer(fn->rr_ptr) == iter)
+ fn->rr_ptr = NULL;
+ fib6_info_release(iter);
+
+ if (nsiblings) {
+ /* Replacing an ECMP route, remove all siblings */
+ ins = &rt->fib6_next;
+ iter = rcu_dereference_protected(*ins,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ while (iter) {
+ if (iter->fib6_metric > rt->fib6_metric)
+ break;
+ if (rt6_qualify_for_ecmp(iter)) {
+ *ins = iter->fib6_next;
+ iter->fib6_node = NULL;
+ fib6_purge_rt(iter, fn, info->nl_net);
+ if (rcu_access_pointer(fn->rr_ptr) == iter)
+ fn->rr_ptr = NULL;
+ fib6_info_release(iter);
+ nsiblings--;
+ info->nl_net->ipv6.rt6_stats->fib_rt_entries--;
+ } else {
+ ins = &iter->fib6_next;
+ }
+ iter = rcu_dereference_protected(*ins,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ }
+ WARN_ON(nsiblings != 0);
+ }
+ }
+
+ return 0;
+}
+
+static void fib6_start_gc(struct net *net, struct fib6_info *rt)
+{
+ if (!timer_pending(&net->ipv6.ip6_fib_timer) &&
+ (rt->fib6_flags & RTF_EXPIRES))
+ mod_timer(&net->ipv6.ip6_fib_timer,
+ jiffies + net->ipv6.sysctl.ip6_rt_gc_interval);
+}
+
+void fib6_force_start_gc(struct net *net)
+{
+ if (!timer_pending(&net->ipv6.ip6_fib_timer))
+ mod_timer(&net->ipv6.ip6_fib_timer,
+ jiffies + net->ipv6.sysctl.ip6_rt_gc_interval);
+}
+
+static void __fib6_update_sernum_upto_root(struct fib6_info *rt,
+ int sernum)
+{
+ struct fib6_node *fn = rcu_dereference_protected(rt->fib6_node,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+
+ /* paired with smp_rmb() in rt6_get_cookie_safe() */
+ smp_wmb();
+ while (fn) {
+ fn->fn_sernum = sernum;
+ fn = rcu_dereference_protected(fn->parent,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ }
+}
+
+void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt)
+{
+ __fib6_update_sernum_upto_root(rt, fib6_new_sernum(net));
+}
+
+/*
+ * Add routing information to the routing tree.
+ * <destination addr>/<source addr>
+ * with source addr info in sub-trees
+ * Need to own table->tb6_lock
+ */
+
+int fib6_add(struct fib6_node *root, struct fib6_info *rt,
+ struct nl_info *info, struct netlink_ext_ack *extack)
+{
+ struct fib6_table *table = rt->fib6_table;
+ struct fib6_node *fn, *pn = NULL;
+ int err = -ENOMEM;
+ int allow_create = 1;
+ int replace_required = 0;
+ int sernum = fib6_new_sernum(info->nl_net);
+
+ if (info->nlh) {
+ if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
+ allow_create = 0;
+ if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
+ replace_required = 1;
+ }
+ if (!allow_create && !replace_required)
+ pr_warn("RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE\n");
+
+ fn = fib6_add_1(info->nl_net, table, root,
+ &rt->fib6_dst.addr, rt->fib6_dst.plen,
+ offsetof(struct fib6_info, fib6_dst), allow_create,
+ replace_required, extack);
+ if (IS_ERR(fn)) {
+ err = PTR_ERR(fn);
+ fn = NULL;
+ goto out;
+ }
+
+ pn = fn;
+
+#ifdef CONFIG_IPV6_SUBTREES
+ if (rt->fib6_src.plen) {
+ struct fib6_node *sn;
+
+ if (!rcu_access_pointer(fn->subtree)) {
+ struct fib6_node *sfn;
+
+ /*
+ * Create subtree.
+ *
+ * fn[main tree]
+ * |
+ * sfn[subtree root]
+ * \
+ * sn[new leaf node]
+ */
+
+ /* Create subtree root node */
+ sfn = node_alloc(info->nl_net);
+ if (!sfn)
+ goto failure;
+
+ atomic_inc(&info->nl_net->ipv6.fib6_null_entry->fib6_ref);
+ rcu_assign_pointer(sfn->leaf,
+ info->nl_net->ipv6.fib6_null_entry);
+ sfn->fn_flags = RTN_ROOT;
+
+ /* Now add the first leaf node to new subtree */
+
+ sn = fib6_add_1(info->nl_net, table, sfn,
+ &rt->fib6_src.addr, rt->fib6_src.plen,
+ offsetof(struct fib6_info, fib6_src),
+ allow_create, replace_required, extack);
+
+ if (IS_ERR(sn)) {
+ /* If it is failed, discard just allocated
+ root, and then (in failure) stale node
+ in main tree.
+ */
+ node_free_immediate(info->nl_net, sfn);
+ err = PTR_ERR(sn);
+ goto failure;
+ }
+
+ /* Now link new subtree to main tree */
+ rcu_assign_pointer(sfn->parent, fn);
+ rcu_assign_pointer(fn->subtree, sfn);
+ } else {
+ sn = fib6_add_1(info->nl_net, table, FIB6_SUBTREE(fn),
+ &rt->fib6_src.addr, rt->fib6_src.plen,
+ offsetof(struct fib6_info, fib6_src),
+ allow_create, replace_required, extack);
+
+ if (IS_ERR(sn)) {
+ err = PTR_ERR(sn);
+ goto failure;
+ }
+ }
+
+ if (!rcu_access_pointer(fn->leaf)) {
+ if (fn->fn_flags & RTN_TL_ROOT) {
+ /* put back null_entry for root node */
+ rcu_assign_pointer(fn->leaf,
+ info->nl_net->ipv6.fib6_null_entry);
+ } else {
+ atomic_inc(&rt->fib6_ref);
+ rcu_assign_pointer(fn->leaf, rt);
+ }
+ }
+ fn = sn;
+ }
+#endif
+
+ err = fib6_add_rt2node(fn, rt, info, extack);
+ if (!err) {
+ __fib6_update_sernum_upto_root(rt, sernum);
+ fib6_start_gc(info->nl_net, rt);
+ }
+
+out:
+ if (err) {
+#ifdef CONFIG_IPV6_SUBTREES
+ /*
+ * If fib6_add_1 has cleared the old leaf pointer in the
+ * super-tree leaf node we have to find a new one for it.
+ */
+ if (pn != fn) {
+ struct fib6_info *pn_leaf =
+ rcu_dereference_protected(pn->leaf,
+ lockdep_is_held(&table->tb6_lock));
+ if (pn_leaf == rt) {
+ pn_leaf = NULL;
+ RCU_INIT_POINTER(pn->leaf, NULL);
+ fib6_info_release(rt);
+ }
+ if (!pn_leaf && !(pn->fn_flags & RTN_RTINFO)) {
+ pn_leaf = fib6_find_prefix(info->nl_net, table,
+ pn);
+#if RT6_DEBUG >= 2
+ if (!pn_leaf) {
+ WARN_ON(!pn_leaf);
+ pn_leaf =
+ info->nl_net->ipv6.fib6_null_entry;
+ }
+#endif
+ fib6_info_hold(pn_leaf);
+ rcu_assign_pointer(pn->leaf, pn_leaf);
+ }
+ }
+#endif
+ goto failure;
+ }
+ return err;
+
+failure:
+ /* fn->leaf could be NULL and fib6_repair_tree() needs to be called if:
+ * 1. fn is an intermediate node and we failed to add the new
+ * route to it in both subtree creation failure and fib6_add_rt2node()
+ * failure case.
+ * 2. fn is the root node in the table and we fail to add the first
+ * default route to it.
+ */
+ if (fn &&
+ (!(fn->fn_flags & (RTN_RTINFO|RTN_ROOT)) ||
+ (fn->fn_flags & RTN_TL_ROOT &&
+ !rcu_access_pointer(fn->leaf))))
+ fib6_repair_tree(info->nl_net, table, fn);
+ return err;
+}
+
+/*
+ * Routing tree lookup
+ *
+ */
+
+struct lookup_args {
+ int offset; /* key offset on fib6_info */
+ const struct in6_addr *addr; /* search key */
+};
+
+static struct fib6_node *fib6_node_lookup_1(struct fib6_node *root,
+ struct lookup_args *args)
+{
+ struct fib6_node *fn;
+ __be32 dir;
+
+ if (unlikely(args->offset == 0))
+ return NULL;
+
+ /*
+ * Descend on a tree
+ */
+
+ fn = root;
+
+ for (;;) {
+ struct fib6_node *next;
+
+ dir = addr_bit_set(args->addr, fn->fn_bit);
+
+ next = dir ? rcu_dereference(fn->right) :
+ rcu_dereference(fn->left);
+
+ if (next) {
+ fn = next;
+ continue;
+ }
+ break;
+ }
+
+ while (fn) {
+ struct fib6_node *subtree = FIB6_SUBTREE(fn);
+
+ if (subtree || fn->fn_flags & RTN_RTINFO) {
+ struct fib6_info *leaf = rcu_dereference(fn->leaf);
+ struct rt6key *key;
+
+ if (!leaf)
+ goto backtrack;
+
+ key = (struct rt6key *) ((u8 *)leaf + args->offset);
+
+ if (ipv6_prefix_equal(&key->addr, args->addr, key->plen)) {
+#ifdef CONFIG_IPV6_SUBTREES
+ if (subtree) {
+ struct fib6_node *sfn;
+ sfn = fib6_node_lookup_1(subtree,
+ args + 1);
+ if (!sfn)
+ goto backtrack;
+ fn = sfn;
+ }
+#endif
+ if (fn->fn_flags & RTN_RTINFO)
+ return fn;
+ }
+ }
+backtrack:
+ if (fn->fn_flags & RTN_ROOT)
+ break;
+
+ fn = rcu_dereference(fn->parent);
+ }
+
+ return NULL;
+}
+
+/* called with rcu_read_lock() held
+ */
+struct fib6_node *fib6_node_lookup(struct fib6_node *root,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
+{
+ struct fib6_node *fn;
+ struct lookup_args args[] = {
+ {
+ .offset = offsetof(struct fib6_info, fib6_dst),
+ .addr = daddr,
+ },
+#ifdef CONFIG_IPV6_SUBTREES
+ {
+ .offset = offsetof(struct fib6_info, fib6_src),
+ .addr = saddr,
+ },
+#endif
+ {
+ .offset = 0, /* sentinel */
+ }
+ };
+
+ fn = fib6_node_lookup_1(root, daddr ? args : args + 1);
+ if (!fn || fn->fn_flags & RTN_TL_ROOT)
+ fn = root;
+
+ return fn;
+}
+
+/*
+ * Get node with specified destination prefix (and source prefix,
+ * if subtrees are used)
+ * exact_match == true means we try to find fn with exact match of
+ * the passed in prefix addr
+ * exact_match == false means we try to find fn with longest prefix
+ * match of the passed in prefix addr. This is useful for finding fn
+ * for cached route as it will be stored in the exception table under
+ * the node with longest prefix length.
+ */
+
+
+static struct fib6_node *fib6_locate_1(struct fib6_node *root,
+ const struct in6_addr *addr,
+ int plen, int offset,
+ bool exact_match)
+{
+ struct fib6_node *fn, *prev = NULL;
+
+ for (fn = root; fn ; ) {
+ struct fib6_info *leaf = rcu_dereference(fn->leaf);
+ struct rt6key *key;
+
+ /* This node is being deleted */
+ if (!leaf) {
+ if (plen <= fn->fn_bit)
+ goto out;
+ else
+ goto next;
+ }
+
+ key = (struct rt6key *)((u8 *)leaf + offset);
+
+ /*
+ * Prefix match
+ */
+ if (plen < fn->fn_bit ||
+ !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit))
+ goto out;
+
+ if (plen == fn->fn_bit)
+ return fn;
+
+ prev = fn;
+
+next:
+ /*
+ * We have more bits to go
+ */
+ if (addr_bit_set(addr, fn->fn_bit))
+ fn = rcu_dereference(fn->right);
+ else
+ fn = rcu_dereference(fn->left);
+ }
+out:
+ if (exact_match)
+ return NULL;
+ else
+ return prev;
+}
+
+struct fib6_node *fib6_locate(struct fib6_node *root,
+ const struct in6_addr *daddr, int dst_len,
+ const struct in6_addr *saddr, int src_len,
+ bool exact_match)
+{
+ struct fib6_node *fn;
+
+ fn = fib6_locate_1(root, daddr, dst_len,
+ offsetof(struct fib6_info, fib6_dst),
+ exact_match);
+
+#ifdef CONFIG_IPV6_SUBTREES
+ if (src_len) {
+ WARN_ON(saddr == NULL);
+ if (fn) {
+ struct fib6_node *subtree = FIB6_SUBTREE(fn);
+
+ if (subtree) {
+ fn = fib6_locate_1(subtree, saddr, src_len,
+ offsetof(struct fib6_info, fib6_src),
+ exact_match);
+ }
+ }
+ }
+#endif
+
+ if (fn && fn->fn_flags & RTN_RTINFO)
+ return fn;
+
+ return NULL;
+}
+
+
+/*
+ * Deletion
+ *
+ */
+
+static struct fib6_info *fib6_find_prefix(struct net *net,
+ struct fib6_table *table,
+ struct fib6_node *fn)
+{
+ struct fib6_node *child_left, *child_right;
+
+ if (fn->fn_flags & RTN_ROOT)
+ return net->ipv6.fib6_null_entry;
+
+ while (fn) {
+ child_left = rcu_dereference_protected(fn->left,
+ lockdep_is_held(&table->tb6_lock));
+ child_right = rcu_dereference_protected(fn->right,
+ lockdep_is_held(&table->tb6_lock));
+ if (child_left)
+ return rcu_dereference_protected(child_left->leaf,
+ lockdep_is_held(&table->tb6_lock));
+ if (child_right)
+ return rcu_dereference_protected(child_right->leaf,
+ lockdep_is_held(&table->tb6_lock));
+
+ fn = FIB6_SUBTREE(fn);
+ }
+ return NULL;
+}
+
+/*
+ * Called to trim the tree of intermediate nodes when possible. "fn"
+ * is the node we want to try and remove.
+ * Need to own table->tb6_lock
+ */
+
+static struct fib6_node *fib6_repair_tree(struct net *net,
+ struct fib6_table *table,
+ struct fib6_node *fn)
+{
+ int children;
+ int nstate;
+ struct fib6_node *child;
+ struct fib6_walker *w;
+ int iter = 0;
+
+ /* Set fn->leaf to null_entry for root node. */
+ if (fn->fn_flags & RTN_TL_ROOT) {
+ rcu_assign_pointer(fn->leaf, net->ipv6.fib6_null_entry);
+ return fn;
+ }
+
+ for (;;) {
+ struct fib6_node *fn_r = rcu_dereference_protected(fn->right,
+ lockdep_is_held(&table->tb6_lock));
+ struct fib6_node *fn_l = rcu_dereference_protected(fn->left,
+ lockdep_is_held(&table->tb6_lock));
+ struct fib6_node *pn = rcu_dereference_protected(fn->parent,
+ lockdep_is_held(&table->tb6_lock));
+ struct fib6_node *pn_r = rcu_dereference_protected(pn->right,
+ lockdep_is_held(&table->tb6_lock));
+ struct fib6_node *pn_l = rcu_dereference_protected(pn->left,
+ lockdep_is_held(&table->tb6_lock));
+ struct fib6_info *fn_leaf = rcu_dereference_protected(fn->leaf,
+ lockdep_is_held(&table->tb6_lock));
+ struct fib6_info *pn_leaf = rcu_dereference_protected(pn->leaf,
+ lockdep_is_held(&table->tb6_lock));
+ struct fib6_info *new_fn_leaf;
+
+ RT6_TRACE("fixing tree: plen=%d iter=%d\n", fn->fn_bit, iter);
+ iter++;
+
+ WARN_ON(fn->fn_flags & RTN_RTINFO);
+ WARN_ON(fn->fn_flags & RTN_TL_ROOT);
+ WARN_ON(fn_leaf);
+
+ children = 0;
+ child = NULL;
+ if (fn_r)
+ child = fn_r, children |= 1;
+ if (fn_l)
+ child = fn_l, children |= 2;
+
+ if (children == 3 || FIB6_SUBTREE(fn)
+#ifdef CONFIG_IPV6_SUBTREES
+ /* Subtree root (i.e. fn) may have one child */
+ || (children && fn->fn_flags & RTN_ROOT)
+#endif
+ ) {
+ new_fn_leaf = fib6_find_prefix(net, table, fn);
+#if RT6_DEBUG >= 2
+ if (!new_fn_leaf) {
+ WARN_ON(!new_fn_leaf);
+ new_fn_leaf = net->ipv6.fib6_null_entry;
+ }
+#endif
+ fib6_info_hold(new_fn_leaf);
+ rcu_assign_pointer(fn->leaf, new_fn_leaf);
+ return pn;
+ }
+
+#ifdef CONFIG_IPV6_SUBTREES
+ if (FIB6_SUBTREE(pn) == fn) {
+ WARN_ON(!(fn->fn_flags & RTN_ROOT));
+ RCU_INIT_POINTER(pn->subtree, NULL);
+ nstate = FWS_L;
+ } else {
+ WARN_ON(fn->fn_flags & RTN_ROOT);
+#endif
+ if (pn_r == fn)
+ rcu_assign_pointer(pn->right, child);
+ else if (pn_l == fn)
+ rcu_assign_pointer(pn->left, child);
+#if RT6_DEBUG >= 2
+ else
+ WARN_ON(1);
+#endif
+ if (child)
+ rcu_assign_pointer(child->parent, pn);
+ nstate = FWS_R;
+#ifdef CONFIG_IPV6_SUBTREES
+ }
+#endif
+
+ read_lock(&net->ipv6.fib6_walker_lock);
+ FOR_WALKERS(net, w) {
+ if (!child) {
+ if (w->node == fn) {
+ RT6_TRACE("W %p adjusted by delnode 1, s=%d/%d\n", w, w->state, nstate);
+ w->node = pn;
+ w->state = nstate;
+ }
+ } else {
+ if (w->node == fn) {
+ w->node = child;
+ if (children&2) {
+ RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state);
+ w->state = w->state >= FWS_R ? FWS_U : FWS_INIT;
+ } else {
+ RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state);
+ w->state = w->state >= FWS_C ? FWS_U : FWS_INIT;
+ }
+ }
+ }
+ }
+ read_unlock(&net->ipv6.fib6_walker_lock);
+
+ node_free(net, fn);
+ if (pn->fn_flags & RTN_RTINFO || FIB6_SUBTREE(pn))
+ return pn;
+
+ RCU_INIT_POINTER(pn->leaf, NULL);
+ fib6_info_release(pn_leaf);
+ fn = pn;
+ }
+}
+
+static void fib6_del_route(struct fib6_table *table, struct fib6_node *fn,
+ struct fib6_info __rcu **rtp, struct nl_info *info)
+{
+ struct fib6_walker *w;
+ struct fib6_info *rt = rcu_dereference_protected(*rtp,
+ lockdep_is_held(&table->tb6_lock));
+ struct net *net = info->nl_net;
+
+ RT6_TRACE("fib6_del_route\n");
+
+ /* Unlink it */
+ *rtp = rt->fib6_next;
+ rt->fib6_node = NULL;
+ net->ipv6.rt6_stats->fib_rt_entries--;
+ net->ipv6.rt6_stats->fib_discarded_routes++;
+
+ /* Flush all cached dst in exception table */
+ rt6_flush_exceptions(rt);
+
+ /* Reset round-robin state, if necessary */
+ if (rcu_access_pointer(fn->rr_ptr) == rt)
+ fn->rr_ptr = NULL;
+
+ /* Remove this entry from other siblings */
+ if (rt->fib6_nsiblings) {
+ struct fib6_info *sibling, *next_sibling;
+
+ list_for_each_entry_safe(sibling, next_sibling,
+ &rt->fib6_siblings, fib6_siblings)
+ sibling->fib6_nsiblings--;
+ rt->fib6_nsiblings = 0;
+ list_del_init(&rt->fib6_siblings);
+ rt6_multipath_rebalance(next_sibling);
+ }
+
+ /* Adjust walkers */
+ read_lock(&net->ipv6.fib6_walker_lock);
+ FOR_WALKERS(net, w) {
+ if (w->state == FWS_C && w->leaf == rt) {
+ RT6_TRACE("walker %p adjusted by delroute\n", w);
+ w->leaf = rcu_dereference_protected(rt->fib6_next,
+ lockdep_is_held(&table->tb6_lock));
+ if (!w->leaf)
+ w->state = FWS_U;
+ }
+ }
+ read_unlock(&net->ipv6.fib6_walker_lock);
+
+ /* If it was last route, call fib6_repair_tree() to:
+ * 1. For root node, put back null_entry as how the table was created.
+ * 2. For other nodes, expunge its radix tree node.
+ */
+ if (!rcu_access_pointer(fn->leaf)) {
+ if (!(fn->fn_flags & RTN_TL_ROOT)) {
+ fn->fn_flags &= ~RTN_RTINFO;
+ net->ipv6.rt6_stats->fib_route_nodes--;
+ }
+ fn = fib6_repair_tree(net, table, fn);
+ }
+
+ fib6_purge_rt(rt, fn, net);
+
+ call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, rt, NULL);
+ if (!info->skip_notify)
+ inet6_rt_notify(RTM_DELROUTE, rt, info, 0);
+ fib6_info_release(rt);
+}
+
+/* Need to own table->tb6_lock */
+int fib6_del(struct fib6_info *rt, struct nl_info *info)
+{
+ struct fib6_node *fn = rcu_dereference_protected(rt->fib6_node,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ struct fib6_table *table = rt->fib6_table;
+ struct net *net = info->nl_net;
+ struct fib6_info __rcu **rtp;
+ struct fib6_info __rcu **rtp_next;
+
+ if (!fn || rt == net->ipv6.fib6_null_entry)
+ return -ENOENT;
+
+ WARN_ON(!(fn->fn_flags & RTN_RTINFO));
+
+ /*
+ * Walk the leaf entries looking for ourself
+ */
+
+ for (rtp = &fn->leaf; *rtp; rtp = rtp_next) {
+ struct fib6_info *cur = rcu_dereference_protected(*rtp,
+ lockdep_is_held(&table->tb6_lock));
+ if (rt == cur) {
+ fib6_del_route(table, fn, rtp, info);
+ return 0;
+ }
+ rtp_next = &cur->fib6_next;
+ }
+ return -ENOENT;
+}
+
+/*
+ * Tree traversal function.
+ *
+ * Certainly, it is not interrupt safe.
+ * However, it is internally reenterable wrt itself and fib6_add/fib6_del.
+ * It means, that we can modify tree during walking
+ * and use this function for garbage collection, clone pruning,
+ * cleaning tree when a device goes down etc. etc.
+ *
+ * It guarantees that every node will be traversed,
+ * and that it will be traversed only once.
+ *
+ * Callback function w->func may return:
+ * 0 -> continue walking.
+ * positive value -> walking is suspended (used by tree dumps,
+ * and probably by gc, if it will be split to several slices)
+ * negative value -> terminate walking.
+ *
+ * The function itself returns:
+ * 0 -> walk is complete.
+ * >0 -> walk is incomplete (i.e. suspended)
+ * <0 -> walk is terminated by an error.
+ *
+ * This function is called with tb6_lock held.
+ */
+
+static int fib6_walk_continue(struct fib6_walker *w)
+{
+ struct fib6_node *fn, *pn, *left, *right;
+
+ /* w->root should always be table->tb6_root */
+ WARN_ON_ONCE(!(w->root->fn_flags & RTN_TL_ROOT));
+
+ for (;;) {
+ fn = w->node;
+ if (!fn)
+ return 0;
+
+ switch (w->state) {
+#ifdef CONFIG_IPV6_SUBTREES
+ case FWS_S:
+ if (FIB6_SUBTREE(fn)) {
+ w->node = FIB6_SUBTREE(fn);
+ continue;
+ }
+ w->state = FWS_L;
+#endif
+ /* fall through */
+ case FWS_L:
+ left = rcu_dereference_protected(fn->left, 1);
+ if (left) {
+ w->node = left;
+ w->state = FWS_INIT;
+ continue;
+ }
+ w->state = FWS_R;
+ /* fall through */
+ case FWS_R:
+ right = rcu_dereference_protected(fn->right, 1);
+ if (right) {
+ w->node = right;
+ w->state = FWS_INIT;
+ continue;
+ }
+ w->state = FWS_C;
+ w->leaf = rcu_dereference_protected(fn->leaf, 1);
+ /* fall through */
+ case FWS_C:
+ if (w->leaf && fn->fn_flags & RTN_RTINFO) {
+ int err;
+
+ if (w->skip) {
+ w->skip--;
+ goto skip;
+ }
+
+ err = w->func(w);
+ if (err)
+ return err;
+
+ w->count++;
+ continue;
+ }
+skip:
+ w->state = FWS_U;
+ /* fall through */
+ case FWS_U:
+ if (fn == w->root)
+ return 0;
+ pn = rcu_dereference_protected(fn->parent, 1);
+ left = rcu_dereference_protected(pn->left, 1);
+ right = rcu_dereference_protected(pn->right, 1);
+ w->node = pn;
+#ifdef CONFIG_IPV6_SUBTREES
+ if (FIB6_SUBTREE(pn) == fn) {
+ WARN_ON(!(fn->fn_flags & RTN_ROOT));
+ w->state = FWS_L;
+ continue;
+ }
+#endif
+ if (left == fn) {
+ w->state = FWS_R;
+ continue;
+ }
+ if (right == fn) {
+ w->state = FWS_C;
+ w->leaf = rcu_dereference_protected(w->node->leaf, 1);
+ continue;
+ }
+#if RT6_DEBUG >= 2
+ WARN_ON(1);
+#endif
+ }
+ }
+}
+
+static int fib6_walk(struct net *net, struct fib6_walker *w)
+{
+ int res;
+
+ w->state = FWS_INIT;
+ w->node = w->root;
+
+ fib6_walker_link(net, w);
+ res = fib6_walk_continue(w);
+ if (res <= 0)
+ fib6_walker_unlink(net, w);
+ return res;
+}
+
+static int fib6_clean_node(struct fib6_walker *w)
+{
+ int res;
+ struct fib6_info *rt;
+ struct fib6_cleaner *c = container_of(w, struct fib6_cleaner, w);
+ struct nl_info info = {
+ .nl_net = c->net,
+ };
+
+ if (c->sernum != FIB6_NO_SERNUM_CHANGE &&
+ w->node->fn_sernum != c->sernum)
+ w->node->fn_sernum = c->sernum;
+
+ if (!c->func) {
+ WARN_ON_ONCE(c->sernum == FIB6_NO_SERNUM_CHANGE);
+ w->leaf = NULL;
+ return 0;
+ }
+
+ for_each_fib6_walker_rt(w) {
+ res = c->func(rt, c->arg);
+ if (res == -1) {
+ w->leaf = rt;
+ res = fib6_del(rt, &info);
+ if (res) {
+#if RT6_DEBUG >= 2
+ pr_debug("%s: del failed: rt=%p@%p err=%d\n",
+ __func__, rt,
+ rcu_access_pointer(rt->fib6_node),
+ res);
+#endif
+ continue;
+ }
+ return 0;
+ } else if (res == -2) {
+ if (WARN_ON(!rt->fib6_nsiblings))
+ continue;
+ rt = list_last_entry(&rt->fib6_siblings,
+ struct fib6_info, fib6_siblings);
+ continue;
+ }
+ WARN_ON(res != 0);
+ }
+ w->leaf = rt;
+ return 0;
+}
+
+/*
+ * Convenient frontend to tree walker.
+ *
+ * func is called on each route.
+ * It may return -2 -> skip multipath route.
+ * -1 -> delete this route.
+ * 0 -> continue walking
+ */
+
+static void fib6_clean_tree(struct net *net, struct fib6_node *root,
+ int (*func)(struct fib6_info *, void *arg),
+ int sernum, void *arg)
+{
+ struct fib6_cleaner c;
+
+ c.w.root = root;
+ c.w.func = fib6_clean_node;
+ c.w.count = 0;
+ c.w.skip = 0;
+ c.func = func;
+ c.sernum = sernum;
+ c.arg = arg;
+ c.net = net;
+
+ fib6_walk(net, &c.w);
+}
+
+static void __fib6_clean_all(struct net *net,
+ int (*func)(struct fib6_info *, void *),
+ int sernum, void *arg)
+{
+ struct fib6_table *table;
+ struct hlist_head *head;
+ unsigned int h;
+
+ rcu_read_lock();
+ for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
+ head = &net->ipv6.fib_table_hash[h];
+ hlist_for_each_entry_rcu(table, head, tb6_hlist) {
+ spin_lock_bh(&table->tb6_lock);
+ fib6_clean_tree(net, &table->tb6_root,
+ func, sernum, arg);
+ spin_unlock_bh(&table->tb6_lock);
+ }
+ }
+ rcu_read_unlock();
+}
+
+void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *),
+ void *arg)
+{
+ __fib6_clean_all(net, func, FIB6_NO_SERNUM_CHANGE, arg);
+}
+
+static void fib6_flush_trees(struct net *net)
+{
+ int new_sernum = fib6_new_sernum(net);
+
+ __fib6_clean_all(net, NULL, new_sernum, NULL);
+}
+
+/*
+ * Garbage collection
+ */
+
+static int fib6_age(struct fib6_info *rt, void *arg)
+{
+ struct fib6_gc_args *gc_args = arg;
+ unsigned long now = jiffies;
+
+ /*
+ * check addrconf expiration here.
+ * Routes are expired even if they are in use.
+ */
+
+ if (rt->fib6_flags & RTF_EXPIRES && rt->expires) {
+ if (time_after(now, rt->expires)) {
+ RT6_TRACE("expiring %p\n", rt);
+ return -1;
+ }
+ gc_args->more++;
+ }
+
+ /* Also age clones in the exception table.
+ * Note, that clones are aged out
+ * only if they are not in use now.
+ */
+ rt6_age_exceptions(rt, gc_args, now);
+
+ return 0;
+}
+
+void fib6_run_gc(unsigned long expires, struct net *net, bool force)
+{
+ struct fib6_gc_args gc_args;
+ unsigned long now;
+
+ if (force) {
+ spin_lock_bh(&net->ipv6.fib6_gc_lock);
+ } else if (!spin_trylock_bh(&net->ipv6.fib6_gc_lock)) {
+ mod_timer(&net->ipv6.ip6_fib_timer, jiffies + HZ);
+ return;
+ }
+ gc_args.timeout = expires ? (int)expires :
+ net->ipv6.sysctl.ip6_rt_gc_interval;
+ gc_args.more = 0;
+
+ fib6_clean_all(net, fib6_age, &gc_args);
+ now = jiffies;
+ net->ipv6.ip6_rt_last_gc = now;
+
+ if (gc_args.more)
+ mod_timer(&net->ipv6.ip6_fib_timer,
+ round_jiffies(now
+ + net->ipv6.sysctl.ip6_rt_gc_interval));
+ else
+ del_timer(&net->ipv6.ip6_fib_timer);
+ spin_unlock_bh(&net->ipv6.fib6_gc_lock);
+}
+
+static void fib6_gc_timer_cb(struct timer_list *t)
+{
+ struct net *arg = from_timer(arg, t, ipv6.ip6_fib_timer);
+
+ fib6_run_gc(0, arg, true);
+}
+
+static int __net_init fib6_net_init(struct net *net)
+{
+ size_t size = sizeof(struct hlist_head) * FIB6_TABLE_HASHSZ;
+ int err;
+
+ err = fib6_notifier_init(net);
+ if (err)
+ return err;
+
+ spin_lock_init(&net->ipv6.fib6_gc_lock);
+ rwlock_init(&net->ipv6.fib6_walker_lock);
+ INIT_LIST_HEAD(&net->ipv6.fib6_walkers);
+ timer_setup(&net->ipv6.ip6_fib_timer, fib6_gc_timer_cb, 0);
+
+ net->ipv6.rt6_stats = kzalloc(sizeof(*net->ipv6.rt6_stats), GFP_KERNEL);
+ if (!net->ipv6.rt6_stats)
+ goto out_timer;
+
+ /* Avoid false sharing : Use at least a full cache line */
+ size = max_t(size_t, size, L1_CACHE_BYTES);
+
+ net->ipv6.fib_table_hash = kzalloc(size, GFP_KERNEL);
+ if (!net->ipv6.fib_table_hash)
+ goto out_rt6_stats;
+
+ net->ipv6.fib6_main_tbl = kzalloc(sizeof(*net->ipv6.fib6_main_tbl),
+ GFP_KERNEL);
+ if (!net->ipv6.fib6_main_tbl)
+ goto out_fib_table_hash;
+
+ net->ipv6.fib6_main_tbl->tb6_id = RT6_TABLE_MAIN;
+ rcu_assign_pointer(net->ipv6.fib6_main_tbl->tb6_root.leaf,
+ net->ipv6.fib6_null_entry);
+ net->ipv6.fib6_main_tbl->tb6_root.fn_flags =
+ RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO;
+ inet_peer_base_init(&net->ipv6.fib6_main_tbl->tb6_peers);
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ net->ipv6.fib6_local_tbl = kzalloc(sizeof(*net->ipv6.fib6_local_tbl),
+ GFP_KERNEL);
+ if (!net->ipv6.fib6_local_tbl)
+ goto out_fib6_main_tbl;
+ net->ipv6.fib6_local_tbl->tb6_id = RT6_TABLE_LOCAL;
+ rcu_assign_pointer(net->ipv6.fib6_local_tbl->tb6_root.leaf,
+ net->ipv6.fib6_null_entry);
+ net->ipv6.fib6_local_tbl->tb6_root.fn_flags =
+ RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO;
+ inet_peer_base_init(&net->ipv6.fib6_local_tbl->tb6_peers);
+#endif
+ fib6_tables_init(net);
+
+ return 0;
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+out_fib6_main_tbl:
+ kfree(net->ipv6.fib6_main_tbl);
+#endif
+out_fib_table_hash:
+ kfree(net->ipv6.fib_table_hash);
+out_rt6_stats:
+ kfree(net->ipv6.rt6_stats);
+out_timer:
+ fib6_notifier_exit(net);
+ return -ENOMEM;
+}
+
+static void fib6_net_exit(struct net *net)
+{
+ unsigned int i;
+
+ del_timer_sync(&net->ipv6.ip6_fib_timer);
+
+ for (i = 0; i < FIB6_TABLE_HASHSZ; i++) {
+ struct hlist_head *head = &net->ipv6.fib_table_hash[i];
+ struct hlist_node *tmp;
+ struct fib6_table *tb;
+
+ hlist_for_each_entry_safe(tb, tmp, head, tb6_hlist) {
+ hlist_del(&tb->tb6_hlist);
+ fib6_free_table(tb);
+ }
+ }
+
+ kfree(net->ipv6.fib_table_hash);
+ kfree(net->ipv6.rt6_stats);
+ fib6_notifier_exit(net);
+}
+
+static struct pernet_operations fib6_net_ops = {
+ .init = fib6_net_init,
+ .exit = fib6_net_exit,
+};
+
+int __init fib6_init(void)
+{
+ int ret = -ENOMEM;
+
+ fib6_node_kmem = kmem_cache_create("fib6_nodes",
+ sizeof(struct fib6_node),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (!fib6_node_kmem)
+ goto out;
+
+ ret = register_pernet_subsys(&fib6_net_ops);
+ if (ret)
+ goto out_kmem_cache_create;
+
+ ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE, NULL,
+ inet6_dump_fib, 0);
+ if (ret)
+ goto out_unregister_subsys;
+
+ __fib6_flush_trees = fib6_flush_trees;
+out:
+ return ret;
+
+out_unregister_subsys:
+ unregister_pernet_subsys(&fib6_net_ops);
+out_kmem_cache_create:
+ kmem_cache_destroy(fib6_node_kmem);
+ goto out;
+}
+
+void fib6_gc_cleanup(void)
+{
+ unregister_pernet_subsys(&fib6_net_ops);
+ kmem_cache_destroy(fib6_node_kmem);
+}
+
+#ifdef CONFIG_PROC_FS
+static int ipv6_route_seq_show(struct seq_file *seq, void *v)
+{
+ struct fib6_info *rt = v;
+ struct ipv6_route_iter *iter = seq->private;
+ const struct net_device *dev;
+
+ seq_printf(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen);
+
+#ifdef CONFIG_IPV6_SUBTREES
+ seq_printf(seq, "%pi6 %02x ", &rt->fib6_src.addr, rt->fib6_src.plen);
+#else
+ seq_puts(seq, "00000000000000000000000000000000 00 ");
+#endif
+ if (rt->fib6_flags & RTF_GATEWAY)
+ seq_printf(seq, "%pi6", &rt->fib6_nh.nh_gw);
+ else
+ seq_puts(seq, "00000000000000000000000000000000");
+
+ dev = rt->fib6_nh.nh_dev;
+ seq_printf(seq, " %08x %08x %08x %08x %8s\n",
+ rt->fib6_metric, atomic_read(&rt->fib6_ref), 0,
+ rt->fib6_flags, dev ? dev->name : "");
+ iter->w.leaf = NULL;
+ return 0;
+}
+
+static int ipv6_route_yield(struct fib6_walker *w)
+{
+ struct ipv6_route_iter *iter = w->args;
+
+ if (!iter->skip)
+ return 1;
+
+ do {
+ iter->w.leaf = rcu_dereference_protected(
+ iter->w.leaf->fib6_next,
+ lockdep_is_held(&iter->tbl->tb6_lock));
+ iter->skip--;
+ if (!iter->skip && iter->w.leaf)
+ return 1;
+ } while (iter->w.leaf);
+
+ return 0;
+}
+
+static void ipv6_route_seq_setup_walk(struct ipv6_route_iter *iter,
+ struct net *net)
+{
+ memset(&iter->w, 0, sizeof(iter->w));
+ iter->w.func = ipv6_route_yield;
+ iter->w.root = &iter->tbl->tb6_root;
+ iter->w.state = FWS_INIT;
+ iter->w.node = iter->w.root;
+ iter->w.args = iter;
+ iter->sernum = iter->w.root->fn_sernum;
+ INIT_LIST_HEAD(&iter->w.lh);
+ fib6_walker_link(net, &iter->w);
+}
+
+static struct fib6_table *ipv6_route_seq_next_table(struct fib6_table *tbl,
+ struct net *net)
+{
+ unsigned int h;
+ struct hlist_node *node;
+
+ if (tbl) {
+ h = (tbl->tb6_id & (FIB6_TABLE_HASHSZ - 1)) + 1;
+ node = rcu_dereference_bh(hlist_next_rcu(&tbl->tb6_hlist));
+ } else {
+ h = 0;
+ node = NULL;
+ }
+
+ while (!node && h < FIB6_TABLE_HASHSZ) {
+ node = rcu_dereference_bh(
+ hlist_first_rcu(&net->ipv6.fib_table_hash[h++]));
+ }
+ return hlist_entry_safe(node, struct fib6_table, tb6_hlist);
+}
+
+static void ipv6_route_check_sernum(struct ipv6_route_iter *iter)
+{
+ if (iter->sernum != iter->w.root->fn_sernum) {
+ iter->sernum = iter->w.root->fn_sernum;
+ iter->w.state = FWS_INIT;
+ iter->w.node = iter->w.root;
+ WARN_ON(iter->w.skip);
+ iter->w.skip = iter->w.count;
+ }
+}
+
+static void *ipv6_route_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ int r;
+ struct fib6_info *n;
+ struct net *net = seq_file_net(seq);
+ struct ipv6_route_iter *iter = seq->private;
+
+ if (!v)
+ goto iter_table;
+
+ n = rcu_dereference_bh(((struct fib6_info *)v)->fib6_next);
+ if (n) {
+ ++*pos;
+ return n;
+ }
+
+iter_table:
+ ipv6_route_check_sernum(iter);
+ spin_lock_bh(&iter->tbl->tb6_lock);
+ r = fib6_walk_continue(&iter->w);
+ spin_unlock_bh(&iter->tbl->tb6_lock);
+ if (r > 0) {
+ if (v)
+ ++*pos;
+ return iter->w.leaf;
+ } else if (r < 0) {
+ fib6_walker_unlink(net, &iter->w);
+ return NULL;
+ }
+ fib6_walker_unlink(net, &iter->w);
+
+ iter->tbl = ipv6_route_seq_next_table(iter->tbl, net);
+ if (!iter->tbl)
+ return NULL;
+
+ ipv6_route_seq_setup_walk(iter, net);
+ goto iter_table;
+}
+
+static void *ipv6_route_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(RCU_BH)
+{
+ struct net *net = seq_file_net(seq);
+ struct ipv6_route_iter *iter = seq->private;
+
+ rcu_read_lock_bh();
+ iter->tbl = ipv6_route_seq_next_table(NULL, net);
+ iter->skip = *pos;
+
+ if (iter->tbl) {
+ ipv6_route_seq_setup_walk(iter, net);
+ return ipv6_route_seq_next(seq, NULL, pos);
+ } else {
+ return NULL;
+ }
+}
+
+static bool ipv6_route_iter_active(struct ipv6_route_iter *iter)
+{
+ struct fib6_walker *w = &iter->w;
+ return w->node && !(w->state == FWS_U && w->node == w->root);
+}
+
+static void ipv6_route_seq_stop(struct seq_file *seq, void *v)
+ __releases(RCU_BH)
+{
+ struct net *net = seq_file_net(seq);
+ struct ipv6_route_iter *iter = seq->private;
+
+ if (ipv6_route_iter_active(iter))
+ fib6_walker_unlink(net, &iter->w);
+
+ rcu_read_unlock_bh();
+}
+
+const struct seq_operations ipv6_route_seq_ops = {
+ .start = ipv6_route_seq_start,
+ .next = ipv6_route_seq_next,
+ .stop = ipv6_route_seq_stop,
+ .show = ipv6_route_seq_show
+};
+#endif /* CONFIG_PROC_FS */
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
new file mode 100644
index 0000000..cb54a8a
--- /dev/null
+++ b/net/ipv6/ip6_flowlabel.c
@@ -0,0 +1,856 @@
+/*
+ * ip6_flowlabel.c IPv6 flowlabel manager.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ */
+
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/pid_namespace.h>
+
+#include <net/net_namespace.h>
+#include <net/sock.h>
+
+#include <net/ipv6.h>
+#include <net/rawv6.h>
+#include <net/transp_v6.h>
+
+#include <linux/uaccess.h>
+
+#define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
+ in old IPv6 RFC. Well, it was reasonable value.
+ */
+#define FL_MAX_LINGER 150 /* Maximal linger timeout */
+
+/* FL hash table */
+
+#define FL_MAX_PER_SOCK 32
+#define FL_MAX_SIZE 4096
+#define FL_HASH_MASK 255
+#define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
+
+static atomic_t fl_size = ATOMIC_INIT(0);
+static struct ip6_flowlabel __rcu *fl_ht[FL_HASH_MASK+1];
+
+static void ip6_fl_gc(struct timer_list *unused);
+static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc);
+
+/* FL hash table lock: it protects only of GC */
+
+static DEFINE_SPINLOCK(ip6_fl_lock);
+
+/* Big socket sock */
+
+static DEFINE_SPINLOCK(ip6_sk_fl_lock);
+
+#define for_each_fl_rcu(hash, fl) \
+ for (fl = rcu_dereference_bh(fl_ht[(hash)]); \
+ fl != NULL; \
+ fl = rcu_dereference_bh(fl->next))
+#define for_each_fl_continue_rcu(fl) \
+ for (fl = rcu_dereference_bh(fl->next); \
+ fl != NULL; \
+ fl = rcu_dereference_bh(fl->next))
+
+#define for_each_sk_fl_rcu(np, sfl) \
+ for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \
+ sfl != NULL; \
+ sfl = rcu_dereference_bh(sfl->next))
+
+static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
+{
+ struct ip6_flowlabel *fl;
+
+ for_each_fl_rcu(FL_HASH(label), fl) {
+ if (fl->label == label && net_eq(fl->fl_net, net))
+ return fl;
+ }
+ return NULL;
+}
+
+static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
+{
+ struct ip6_flowlabel *fl;
+
+ rcu_read_lock_bh();
+ fl = __fl_lookup(net, label);
+ if (fl && !atomic_inc_not_zero(&fl->users))
+ fl = NULL;
+ rcu_read_unlock_bh();
+ return fl;
+}
+
+
+static void fl_free(struct ip6_flowlabel *fl)
+{
+ if (fl) {
+ if (fl->share == IPV6_FL_S_PROCESS)
+ put_pid(fl->owner.pid);
+ kfree(fl->opt);
+ kfree_rcu(fl, rcu);
+ }
+}
+
+static void fl_release(struct ip6_flowlabel *fl)
+{
+ spin_lock_bh(&ip6_fl_lock);
+
+ fl->lastuse = jiffies;
+ if (atomic_dec_and_test(&fl->users)) {
+ unsigned long ttd = fl->lastuse + fl->linger;
+ if (time_after(ttd, fl->expires))
+ fl->expires = ttd;
+ ttd = fl->expires;
+ if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
+ struct ipv6_txoptions *opt = fl->opt;
+ fl->opt = NULL;
+ kfree(opt);
+ }
+ if (!timer_pending(&ip6_fl_gc_timer) ||
+ time_after(ip6_fl_gc_timer.expires, ttd))
+ mod_timer(&ip6_fl_gc_timer, ttd);
+ }
+ spin_unlock_bh(&ip6_fl_lock);
+}
+
+static void ip6_fl_gc(struct timer_list *unused)
+{
+ int i;
+ unsigned long now = jiffies;
+ unsigned long sched = 0;
+
+ spin_lock(&ip6_fl_lock);
+
+ for (i = 0; i <= FL_HASH_MASK; i++) {
+ struct ip6_flowlabel *fl;
+ struct ip6_flowlabel __rcu **flp;
+
+ flp = &fl_ht[i];
+ while ((fl = rcu_dereference_protected(*flp,
+ lockdep_is_held(&ip6_fl_lock))) != NULL) {
+ if (atomic_read(&fl->users) == 0) {
+ unsigned long ttd = fl->lastuse + fl->linger;
+ if (time_after(ttd, fl->expires))
+ fl->expires = ttd;
+ ttd = fl->expires;
+ if (time_after_eq(now, ttd)) {
+ *flp = fl->next;
+ fl_free(fl);
+ atomic_dec(&fl_size);
+ continue;
+ }
+ if (!sched || time_before(ttd, sched))
+ sched = ttd;
+ }
+ flp = &fl->next;
+ }
+ }
+ if (!sched && atomic_read(&fl_size))
+ sched = now + FL_MAX_LINGER;
+ if (sched) {
+ mod_timer(&ip6_fl_gc_timer, sched);
+ }
+ spin_unlock(&ip6_fl_lock);
+}
+
+static void __net_exit ip6_fl_purge(struct net *net)
+{
+ int i;
+
+ spin_lock_bh(&ip6_fl_lock);
+ for (i = 0; i <= FL_HASH_MASK; i++) {
+ struct ip6_flowlabel *fl;
+ struct ip6_flowlabel __rcu **flp;
+
+ flp = &fl_ht[i];
+ while ((fl = rcu_dereference_protected(*flp,
+ lockdep_is_held(&ip6_fl_lock))) != NULL) {
+ if (net_eq(fl->fl_net, net) &&
+ atomic_read(&fl->users) == 0) {
+ *flp = fl->next;
+ fl_free(fl);
+ atomic_dec(&fl_size);
+ continue;
+ }
+ flp = &fl->next;
+ }
+ }
+ spin_unlock_bh(&ip6_fl_lock);
+}
+
+static struct ip6_flowlabel *fl_intern(struct net *net,
+ struct ip6_flowlabel *fl, __be32 label)
+{
+ struct ip6_flowlabel *lfl;
+
+ fl->label = label & IPV6_FLOWLABEL_MASK;
+
+ spin_lock_bh(&ip6_fl_lock);
+ if (label == 0) {
+ for (;;) {
+ fl->label = htonl(prandom_u32())&IPV6_FLOWLABEL_MASK;
+ if (fl->label) {
+ lfl = __fl_lookup(net, fl->label);
+ if (!lfl)
+ break;
+ }
+ }
+ } else {
+ /*
+ * we dropper the ip6_fl_lock, so this entry could reappear
+ * and we need to recheck with it.
+ *
+ * OTOH no need to search the active socket first, like it is
+ * done in ipv6_flowlabel_opt - sock is locked, so new entry
+ * with the same label can only appear on another sock
+ */
+ lfl = __fl_lookup(net, fl->label);
+ if (lfl) {
+ atomic_inc(&lfl->users);
+ spin_unlock_bh(&ip6_fl_lock);
+ return lfl;
+ }
+ }
+
+ fl->lastuse = jiffies;
+ fl->next = fl_ht[FL_HASH(fl->label)];
+ rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
+ atomic_inc(&fl_size);
+ spin_unlock_bh(&ip6_fl_lock);
+ return NULL;
+}
+
+
+
+/* Socket flowlabel lists */
+
+struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label)
+{
+ struct ipv6_fl_socklist *sfl;
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ label &= IPV6_FLOWLABEL_MASK;
+
+ rcu_read_lock_bh();
+ for_each_sk_fl_rcu(np, sfl) {
+ struct ip6_flowlabel *fl = sfl->fl;
+ if (fl->label == label) {
+ fl->lastuse = jiffies;
+ atomic_inc(&fl->users);
+ rcu_read_unlock_bh();
+ return fl;
+ }
+ }
+ rcu_read_unlock_bh();
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(fl6_sock_lookup);
+
+void fl6_free_socklist(struct sock *sk)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_fl_socklist *sfl;
+
+ if (!rcu_access_pointer(np->ipv6_fl_list))
+ return;
+
+ spin_lock_bh(&ip6_sk_fl_lock);
+ while ((sfl = rcu_dereference_protected(np->ipv6_fl_list,
+ lockdep_is_held(&ip6_sk_fl_lock))) != NULL) {
+ np->ipv6_fl_list = sfl->next;
+ spin_unlock_bh(&ip6_sk_fl_lock);
+
+ fl_release(sfl->fl);
+ kfree_rcu(sfl, rcu);
+
+ spin_lock_bh(&ip6_sk_fl_lock);
+ }
+ spin_unlock_bh(&ip6_sk_fl_lock);
+}
+
+/* Service routines */
+
+
+/*
+ It is the only difficult place. flowlabel enforces equal headers
+ before and including routing header, however user may supply options
+ following rthdr.
+ */
+
+struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
+ struct ip6_flowlabel *fl,
+ struct ipv6_txoptions *fopt)
+{
+ struct ipv6_txoptions *fl_opt = fl->opt;
+
+ if (!fopt || fopt->opt_flen == 0)
+ return fl_opt;
+
+ if (fl_opt) {
+ opt_space->hopopt = fl_opt->hopopt;
+ opt_space->dst0opt = fl_opt->dst0opt;
+ opt_space->srcrt = fl_opt->srcrt;
+ opt_space->opt_nflen = fl_opt->opt_nflen;
+ } else {
+ if (fopt->opt_nflen == 0)
+ return fopt;
+ opt_space->hopopt = NULL;
+ opt_space->dst0opt = NULL;
+ opt_space->srcrt = NULL;
+ opt_space->opt_nflen = 0;
+ }
+ opt_space->dst1opt = fopt->dst1opt;
+ opt_space->opt_flen = fopt->opt_flen;
+ opt_space->tot_len = fopt->tot_len;
+ return opt_space;
+}
+EXPORT_SYMBOL_GPL(fl6_merge_options);
+
+static unsigned long check_linger(unsigned long ttl)
+{
+ if (ttl < FL_MIN_LINGER)
+ return FL_MIN_LINGER*HZ;
+ if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
+ return 0;
+ return ttl*HZ;
+}
+
+static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
+{
+ linger = check_linger(linger);
+ if (!linger)
+ return -EPERM;
+ expires = check_linger(expires);
+ if (!expires)
+ return -EPERM;
+
+ spin_lock_bh(&ip6_fl_lock);
+ fl->lastuse = jiffies;
+ if (time_before(fl->linger, linger))
+ fl->linger = linger;
+ if (time_before(expires, fl->linger))
+ expires = fl->linger;
+ if (time_before(fl->expires, fl->lastuse + expires))
+ fl->expires = fl->lastuse + expires;
+ spin_unlock_bh(&ip6_fl_lock);
+
+ return 0;
+}
+
+static struct ip6_flowlabel *
+fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
+ char __user *optval, int optlen, int *err_p)
+{
+ struct ip6_flowlabel *fl = NULL;
+ int olen;
+ int addr_type;
+ int err;
+
+ olen = optlen - CMSG_ALIGN(sizeof(*freq));
+ err = -EINVAL;
+ if (olen > 64 * 1024)
+ goto done;
+
+ err = -ENOMEM;
+ fl = kzalloc(sizeof(*fl), GFP_KERNEL);
+ if (!fl)
+ goto done;
+
+ if (olen > 0) {
+ struct msghdr msg;
+ struct flowi6 flowi6;
+ struct ipcm6_cookie ipc6;
+
+ err = -ENOMEM;
+ fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
+ if (!fl->opt)
+ goto done;
+
+ memset(fl->opt, 0, sizeof(*fl->opt));
+ fl->opt->tot_len = sizeof(*fl->opt) + olen;
+ err = -EFAULT;
+ if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
+ goto done;
+
+ msg.msg_controllen = olen;
+ msg.msg_control = (void *)(fl->opt+1);
+ memset(&flowi6, 0, sizeof(flowi6));
+
+ ipc6.opt = fl->opt;
+ err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, &ipc6);
+ if (err)
+ goto done;
+ err = -EINVAL;
+ if (fl->opt->opt_flen)
+ goto done;
+ if (fl->opt->opt_nflen == 0) {
+ kfree(fl->opt);
+ fl->opt = NULL;
+ }
+ }
+
+ fl->fl_net = net;
+ fl->expires = jiffies;
+ err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
+ if (err)
+ goto done;
+ fl->share = freq->flr_share;
+ addr_type = ipv6_addr_type(&freq->flr_dst);
+ if ((addr_type & IPV6_ADDR_MAPPED) ||
+ addr_type == IPV6_ADDR_ANY) {
+ err = -EINVAL;
+ goto done;
+ }
+ fl->dst = freq->flr_dst;
+ atomic_set(&fl->users, 1);
+ switch (fl->share) {
+ case IPV6_FL_S_EXCL:
+ case IPV6_FL_S_ANY:
+ break;
+ case IPV6_FL_S_PROCESS:
+ fl->owner.pid = get_task_pid(current, PIDTYPE_PID);
+ break;
+ case IPV6_FL_S_USER:
+ fl->owner.uid = current_euid();
+ break;
+ default:
+ err = -EINVAL;
+ goto done;
+ }
+ return fl;
+
+done:
+ fl_free(fl);
+ *err_p = err;
+ return NULL;
+}
+
+static int mem_check(struct sock *sk)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_fl_socklist *sfl;
+ int room = FL_MAX_SIZE - atomic_read(&fl_size);
+ int count = 0;
+
+ if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
+ return 0;
+
+ rcu_read_lock_bh();
+ for_each_sk_fl_rcu(np, sfl)
+ count++;
+ rcu_read_unlock_bh();
+
+ if (room <= 0 ||
+ ((count >= FL_MAX_PER_SOCK ||
+ (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
+ !capable(CAP_NET_ADMIN)))
+ return -ENOBUFS;
+
+ return 0;
+}
+
+static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
+ struct ip6_flowlabel *fl)
+{
+ spin_lock_bh(&ip6_sk_fl_lock);
+ sfl->fl = fl;
+ sfl->next = np->ipv6_fl_list;
+ rcu_assign_pointer(np->ipv6_fl_list, sfl);
+ spin_unlock_bh(&ip6_sk_fl_lock);
+}
+
+int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
+ int flags)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_fl_socklist *sfl;
+
+ if (flags & IPV6_FL_F_REMOTE) {
+ freq->flr_label = np->rcv_flowinfo & IPV6_FLOWLABEL_MASK;
+ return 0;
+ }
+
+ if (np->repflow) {
+ freq->flr_label = np->flow_label;
+ return 0;
+ }
+
+ rcu_read_lock_bh();
+
+ for_each_sk_fl_rcu(np, sfl) {
+ if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) {
+ spin_lock_bh(&ip6_fl_lock);
+ freq->flr_label = sfl->fl->label;
+ freq->flr_dst = sfl->fl->dst;
+ freq->flr_share = sfl->fl->share;
+ freq->flr_expires = (sfl->fl->expires - jiffies) / HZ;
+ freq->flr_linger = sfl->fl->linger / HZ;
+
+ spin_unlock_bh(&ip6_fl_lock);
+ rcu_read_unlock_bh();
+ return 0;
+ }
+ }
+ rcu_read_unlock_bh();
+
+ return -ENOENT;
+}
+
+int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
+{
+ int uninitialized_var(err);
+ struct net *net = sock_net(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct in6_flowlabel_req freq;
+ struct ipv6_fl_socklist *sfl1 = NULL;
+ struct ipv6_fl_socklist *sfl;
+ struct ipv6_fl_socklist __rcu **sflp;
+ struct ip6_flowlabel *fl, *fl1 = NULL;
+
+
+ if (optlen < sizeof(freq))
+ return -EINVAL;
+
+ if (copy_from_user(&freq, optval, sizeof(freq)))
+ return -EFAULT;
+
+ switch (freq.flr_action) {
+ case IPV6_FL_A_PUT:
+ if (freq.flr_flags & IPV6_FL_F_REFLECT) {
+ if (sk->sk_protocol != IPPROTO_TCP)
+ return -ENOPROTOOPT;
+ if (!np->repflow)
+ return -ESRCH;
+ np->flow_label = 0;
+ np->repflow = 0;
+ return 0;
+ }
+ spin_lock_bh(&ip6_sk_fl_lock);
+ for (sflp = &np->ipv6_fl_list;
+ (sfl = rcu_dereference_protected(*sflp,
+ lockdep_is_held(&ip6_sk_fl_lock))) != NULL;
+ sflp = &sfl->next) {
+ if (sfl->fl->label == freq.flr_label) {
+ if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
+ np->flow_label &= ~IPV6_FLOWLABEL_MASK;
+ *sflp = sfl->next;
+ spin_unlock_bh(&ip6_sk_fl_lock);
+ fl_release(sfl->fl);
+ kfree_rcu(sfl, rcu);
+ return 0;
+ }
+ }
+ spin_unlock_bh(&ip6_sk_fl_lock);
+ return -ESRCH;
+
+ case IPV6_FL_A_RENEW:
+ rcu_read_lock_bh();
+ for_each_sk_fl_rcu(np, sfl) {
+ if (sfl->fl->label == freq.flr_label) {
+ err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
+ rcu_read_unlock_bh();
+ return err;
+ }
+ }
+ rcu_read_unlock_bh();
+
+ if (freq.flr_share == IPV6_FL_S_NONE &&
+ ns_capable(net->user_ns, CAP_NET_ADMIN)) {
+ fl = fl_lookup(net, freq.flr_label);
+ if (fl) {
+ err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
+ fl_release(fl);
+ return err;
+ }
+ }
+ return -ESRCH;
+
+ case IPV6_FL_A_GET:
+ if (freq.flr_flags & IPV6_FL_F_REFLECT) {
+ struct net *net = sock_net(sk);
+ if (net->ipv6.sysctl.flowlabel_consistency) {
+ net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
+ return -EPERM;
+ }
+
+ if (sk->sk_protocol != IPPROTO_TCP)
+ return -ENOPROTOOPT;
+
+ np->repflow = 1;
+ return 0;
+ }
+
+ if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
+ return -EINVAL;
+
+ if (net->ipv6.sysctl.flowlabel_state_ranges &&
+ (freq.flr_label & IPV6_FLOWLABEL_STATELESS_FLAG))
+ return -ERANGE;
+
+ fl = fl_create(net, sk, &freq, optval, optlen, &err);
+ if (!fl)
+ return err;
+ sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
+
+ if (freq.flr_label) {
+ err = -EEXIST;
+ rcu_read_lock_bh();
+ for_each_sk_fl_rcu(np, sfl) {
+ if (sfl->fl->label == freq.flr_label) {
+ if (freq.flr_flags&IPV6_FL_F_EXCL) {
+ rcu_read_unlock_bh();
+ goto done;
+ }
+ fl1 = sfl->fl;
+ atomic_inc(&fl1->users);
+ break;
+ }
+ }
+ rcu_read_unlock_bh();
+
+ if (!fl1)
+ fl1 = fl_lookup(net, freq.flr_label);
+ if (fl1) {
+recheck:
+ err = -EEXIST;
+ if (freq.flr_flags&IPV6_FL_F_EXCL)
+ goto release;
+ err = -EPERM;
+ if (fl1->share == IPV6_FL_S_EXCL ||
+ fl1->share != fl->share ||
+ ((fl1->share == IPV6_FL_S_PROCESS) &&
+ (fl1->owner.pid == fl->owner.pid)) ||
+ ((fl1->share == IPV6_FL_S_USER) &&
+ uid_eq(fl1->owner.uid, fl->owner.uid)))
+ goto release;
+
+ err = -ENOMEM;
+ if (!sfl1)
+ goto release;
+ if (fl->linger > fl1->linger)
+ fl1->linger = fl->linger;
+ if ((long)(fl->expires - fl1->expires) > 0)
+ fl1->expires = fl->expires;
+ fl_link(np, sfl1, fl1);
+ fl_free(fl);
+ return 0;
+
+release:
+ fl_release(fl1);
+ goto done;
+ }
+ }
+ err = -ENOENT;
+ if (!(freq.flr_flags&IPV6_FL_F_CREATE))
+ goto done;
+
+ err = -ENOMEM;
+ if (!sfl1)
+ goto done;
+
+ err = mem_check(sk);
+ if (err != 0)
+ goto done;
+
+ fl1 = fl_intern(net, fl, freq.flr_label);
+ if (fl1)
+ goto recheck;
+
+ if (!freq.flr_label) {
+ if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
+ &fl->label, sizeof(fl->label))) {
+ /* Intentionally ignore fault. */
+ }
+ }
+
+ fl_link(np, sfl1, fl);
+ return 0;
+
+ default:
+ return -EINVAL;
+ }
+
+done:
+ fl_free(fl);
+ kfree(sfl1);
+ return err;
+}
+
+#ifdef CONFIG_PROC_FS
+
+struct ip6fl_iter_state {
+ struct seq_net_private p;
+ struct pid_namespace *pid_ns;
+ int bucket;
+};
+
+#define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
+
+static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
+{
+ struct ip6_flowlabel *fl = NULL;
+ struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
+ struct net *net = seq_file_net(seq);
+
+ for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
+ for_each_fl_rcu(state->bucket, fl) {
+ if (net_eq(fl->fl_net, net))
+ goto out;
+ }
+ }
+ fl = NULL;
+out:
+ return fl;
+}
+
+static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
+{
+ struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
+ struct net *net = seq_file_net(seq);
+
+ for_each_fl_continue_rcu(fl) {
+ if (net_eq(fl->fl_net, net))
+ goto out;
+ }
+
+try_again:
+ if (++state->bucket <= FL_HASH_MASK) {
+ for_each_fl_rcu(state->bucket, fl) {
+ if (net_eq(fl->fl_net, net))
+ goto out;
+ }
+ goto try_again;
+ }
+ fl = NULL;
+
+out:
+ return fl;
+}
+
+static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
+{
+ struct ip6_flowlabel *fl = ip6fl_get_first(seq);
+ if (fl)
+ while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
+ --pos;
+ return pos ? NULL : fl;
+}
+
+static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(RCU)
+{
+ struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
+
+ state->pid_ns = proc_pid_ns(file_inode(seq->file));
+
+ rcu_read_lock_bh();
+ return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct ip6_flowlabel *fl;
+
+ if (v == SEQ_START_TOKEN)
+ fl = ip6fl_get_first(seq);
+ else
+ fl = ip6fl_get_next(seq, v);
+ ++*pos;
+ return fl;
+}
+
+static void ip6fl_seq_stop(struct seq_file *seq, void *v)
+ __releases(RCU)
+{
+ rcu_read_unlock_bh();
+}
+
+static int ip6fl_seq_show(struct seq_file *seq, void *v)
+{
+ struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq, "Label S Owner Users Linger Expires Dst Opt\n");
+ } else {
+ struct ip6_flowlabel *fl = v;
+ seq_printf(seq,
+ "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
+ (unsigned int)ntohl(fl->label),
+ fl->share,
+ ((fl->share == IPV6_FL_S_PROCESS) ?
+ pid_nr_ns(fl->owner.pid, state->pid_ns) :
+ ((fl->share == IPV6_FL_S_USER) ?
+ from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
+ 0)),
+ atomic_read(&fl->users),
+ fl->linger/HZ,
+ (long)(fl->expires - jiffies)/HZ,
+ &fl->dst,
+ fl->opt ? fl->opt->opt_nflen : 0);
+ }
+ return 0;
+}
+
+static const struct seq_operations ip6fl_seq_ops = {
+ .start = ip6fl_seq_start,
+ .next = ip6fl_seq_next,
+ .stop = ip6fl_seq_stop,
+ .show = ip6fl_seq_show,
+};
+
+static int __net_init ip6_flowlabel_proc_init(struct net *net)
+{
+ if (!proc_create_net("ip6_flowlabel", 0444, net->proc_net,
+ &ip6fl_seq_ops, sizeof(struct ip6fl_iter_state)))
+ return -ENOMEM;
+ return 0;
+}
+
+static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
+{
+ remove_proc_entry("ip6_flowlabel", net->proc_net);
+}
+#else
+static inline int ip6_flowlabel_proc_init(struct net *net)
+{
+ return 0;
+}
+static inline void ip6_flowlabel_proc_fini(struct net *net)
+{
+}
+#endif
+
+static void __net_exit ip6_flowlabel_net_exit(struct net *net)
+{
+ ip6_fl_purge(net);
+ ip6_flowlabel_proc_fini(net);
+}
+
+static struct pernet_operations ip6_flowlabel_net_ops = {
+ .init = ip6_flowlabel_proc_init,
+ .exit = ip6_flowlabel_net_exit,
+};
+
+int ip6_flowlabel_init(void)
+{
+ return register_pernet_subsys(&ip6_flowlabel_net_ops);
+}
+
+void ip6_flowlabel_cleanup(void)
+{
+ del_timer(&ip6_fl_gc_timer);
+ unregister_pernet_subsys(&ip6_flowlabel_net_ops);
+}
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
new file mode 100644
index 0000000..e493b04
--- /dev/null
+++ b/net/ipv6/ip6_gre.c
@@ -0,0 +1,2376 @@
+/*
+ * GRE over IPv6 protocol decoder.
+ *
+ * Authors: Dmitry Kozlov (xeb@mail.ru)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/capability.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/in.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/in6.h>
+#include <linux/inetdevice.h>
+#include <linux/igmp.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/hash.h>
+#include <linux/if_tunnel.h>
+#include <linux/ip6_tunnel.h>
+
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/icmp.h>
+#include <net/protocol.h>
+#include <net/addrconf.h>
+#include <net/arp.h>
+#include <net/checksum.h>
+#include <net/dsfield.h>
+#include <net/inet_ecn.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/rtnetlink.h>
+
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#include <net/ip6_tunnel.h>
+#include <net/gre.h>
+#include <net/erspan.h>
+#include <net/dst_metadata.h>
+
+
+static bool log_ecn_error = true;
+module_param(log_ecn_error, bool, 0644);
+MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+
+#define IP6_GRE_HASH_SIZE_SHIFT 5
+#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
+
+static unsigned int ip6gre_net_id __read_mostly;
+struct ip6gre_net {
+ struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
+
+ struct ip6_tnl __rcu *collect_md_tun;
+ struct ip6_tnl __rcu *collect_md_tun_erspan;
+ struct net_device *fb_tunnel_dev;
+};
+
+static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
+static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
+static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
+static int ip6gre_tunnel_init(struct net_device *dev);
+static void ip6gre_tunnel_setup(struct net_device *dev);
+static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
+static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
+static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
+
+/* Tunnel hash table */
+
+/*
+ 4 hash tables:
+
+ 3: (remote,local)
+ 2: (remote,*)
+ 1: (*,local)
+ 0: (*,*)
+
+ We require exact key match i.e. if a key is present in packet
+ it will match only tunnel with the same key; if it is not present,
+ it will match only keyless tunnel.
+
+ All keysless packets, if not matched configured keyless tunnels
+ will match fallback tunnel.
+ */
+
+#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
+static u32 HASH_ADDR(const struct in6_addr *addr)
+{
+ u32 hash = ipv6_addr_hash(addr);
+
+ return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
+}
+
+#define tunnels_r_l tunnels[3]
+#define tunnels_r tunnels[2]
+#define tunnels_l tunnels[1]
+#define tunnels_wc tunnels[0]
+
+/* Given src, dst and key, find appropriate for input tunnel. */
+
+static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
+ const struct in6_addr *remote, const struct in6_addr *local,
+ __be32 key, __be16 gre_proto)
+{
+ struct net *net = dev_net(dev);
+ int link = dev->ifindex;
+ unsigned int h0 = HASH_ADDR(remote);
+ unsigned int h1 = HASH_KEY(key);
+ struct ip6_tnl *t, *cand = NULL;
+ struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
+ int dev_type = (gre_proto == htons(ETH_P_TEB) ||
+ gre_proto == htons(ETH_P_ERSPAN) ||
+ gre_proto == htons(ETH_P_ERSPAN2)) ?
+ ARPHRD_ETHER : ARPHRD_IP6GRE;
+ int score, cand_score = 4;
+
+ for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
+ if (!ipv6_addr_equal(local, &t->parms.laddr) ||
+ !ipv6_addr_equal(remote, &t->parms.raddr) ||
+ key != t->parms.i_key ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (t->dev->type != ARPHRD_IP6GRE &&
+ t->dev->type != dev_type)
+ continue;
+
+ score = 0;
+ if (t->parms.link != link)
+ score |= 1;
+ if (t->dev->type != dev_type)
+ score |= 2;
+ if (score == 0)
+ return t;
+
+ if (score < cand_score) {
+ cand = t;
+ cand_score = score;
+ }
+ }
+
+ for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
+ if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
+ key != t->parms.i_key ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (t->dev->type != ARPHRD_IP6GRE &&
+ t->dev->type != dev_type)
+ continue;
+
+ score = 0;
+ if (t->parms.link != link)
+ score |= 1;
+ if (t->dev->type != dev_type)
+ score |= 2;
+ if (score == 0)
+ return t;
+
+ if (score < cand_score) {
+ cand = t;
+ cand_score = score;
+ }
+ }
+
+ for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
+ if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
+ (!ipv6_addr_equal(local, &t->parms.raddr) ||
+ !ipv6_addr_is_multicast(local))) ||
+ key != t->parms.i_key ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (t->dev->type != ARPHRD_IP6GRE &&
+ t->dev->type != dev_type)
+ continue;
+
+ score = 0;
+ if (t->parms.link != link)
+ score |= 1;
+ if (t->dev->type != dev_type)
+ score |= 2;
+ if (score == 0)
+ return t;
+
+ if (score < cand_score) {
+ cand = t;
+ cand_score = score;
+ }
+ }
+
+ for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
+ if (t->parms.i_key != key ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (t->dev->type != ARPHRD_IP6GRE &&
+ t->dev->type != dev_type)
+ continue;
+
+ score = 0;
+ if (t->parms.link != link)
+ score |= 1;
+ if (t->dev->type != dev_type)
+ score |= 2;
+ if (score == 0)
+ return t;
+
+ if (score < cand_score) {
+ cand = t;
+ cand_score = score;
+ }
+ }
+
+ if (cand)
+ return cand;
+
+ if (gre_proto == htons(ETH_P_ERSPAN) ||
+ gre_proto == htons(ETH_P_ERSPAN2))
+ t = rcu_dereference(ign->collect_md_tun_erspan);
+ else
+ t = rcu_dereference(ign->collect_md_tun);
+
+ if (t && t->dev->flags & IFF_UP)
+ return t;
+
+ dev = ign->fb_tunnel_dev;
+ if (dev && dev->flags & IFF_UP)
+ return netdev_priv(dev);
+
+ return NULL;
+}
+
+static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
+ const struct __ip6_tnl_parm *p)
+{
+ const struct in6_addr *remote = &p->raddr;
+ const struct in6_addr *local = &p->laddr;
+ unsigned int h = HASH_KEY(p->i_key);
+ int prio = 0;
+
+ if (!ipv6_addr_any(local))
+ prio |= 1;
+ if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
+ prio |= 2;
+ h ^= HASH_ADDR(remote);
+ }
+
+ return &ign->tunnels[prio][h];
+}
+
+static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
+{
+ if (t->parms.collect_md)
+ rcu_assign_pointer(ign->collect_md_tun, t);
+}
+
+static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
+{
+ if (t->parms.collect_md)
+ rcu_assign_pointer(ign->collect_md_tun_erspan, t);
+}
+
+static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
+{
+ if (t->parms.collect_md)
+ rcu_assign_pointer(ign->collect_md_tun, NULL);
+}
+
+static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
+ struct ip6_tnl *t)
+{
+ if (t->parms.collect_md)
+ rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
+}
+
+static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
+ const struct ip6_tnl *t)
+{
+ return __ip6gre_bucket(ign, &t->parms);
+}
+
+static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
+{
+ struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
+
+ rcu_assign_pointer(t->next, rtnl_dereference(*tp));
+ rcu_assign_pointer(*tp, t);
+}
+
+static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
+{
+ struct ip6_tnl __rcu **tp;
+ struct ip6_tnl *iter;
+
+ for (tp = ip6gre_bucket(ign, t);
+ (iter = rtnl_dereference(*tp)) != NULL;
+ tp = &iter->next) {
+ if (t == iter) {
+ rcu_assign_pointer(*tp, t->next);
+ break;
+ }
+ }
+}
+
+static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
+ const struct __ip6_tnl_parm *parms,
+ int type)
+{
+ const struct in6_addr *remote = &parms->raddr;
+ const struct in6_addr *local = &parms->laddr;
+ __be32 key = parms->i_key;
+ int link = parms->link;
+ struct ip6_tnl *t;
+ struct ip6_tnl __rcu **tp;
+ struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
+
+ for (tp = __ip6gre_bucket(ign, parms);
+ (t = rtnl_dereference(*tp)) != NULL;
+ tp = &t->next)
+ if (ipv6_addr_equal(local, &t->parms.laddr) &&
+ ipv6_addr_equal(remote, &t->parms.raddr) &&
+ key == t->parms.i_key &&
+ link == t->parms.link &&
+ type == t->dev->type)
+ break;
+
+ return t;
+}
+
+static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
+ const struct __ip6_tnl_parm *parms, int create)
+{
+ struct ip6_tnl *t, *nt;
+ struct net_device *dev;
+ char name[IFNAMSIZ];
+ struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
+
+ t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
+ if (t && create)
+ return NULL;
+ if (t || !create)
+ return t;
+
+ if (parms->name[0]) {
+ if (!dev_valid_name(parms->name))
+ return NULL;
+ strlcpy(name, parms->name, IFNAMSIZ);
+ } else {
+ strcpy(name, "ip6gre%d");
+ }
+ dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
+ ip6gre_tunnel_setup);
+ if (!dev)
+ return NULL;
+
+ dev_net_set(dev, net);
+
+ nt = netdev_priv(dev);
+ nt->parms = *parms;
+ dev->rtnl_link_ops = &ip6gre_link_ops;
+
+ nt->dev = dev;
+ nt->net = dev_net(dev);
+
+ if (register_netdevice(dev) < 0)
+ goto failed_free;
+
+ ip6gre_tnl_link_config(nt, 1);
+
+ /* Can use a lockless transmit, unless we generate output sequences */
+ if (!(nt->parms.o_flags & TUNNEL_SEQ))
+ dev->features |= NETIF_F_LLTX;
+
+ dev_hold(dev);
+ ip6gre_tunnel_link(ign, nt);
+ return nt;
+
+failed_free:
+ free_netdev(dev);
+ return NULL;
+}
+
+static void ip6erspan_tunnel_uninit(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
+
+ ip6erspan_tunnel_unlink_md(ign, t);
+ ip6gre_tunnel_unlink(ign, t);
+ dst_cache_reset(&t->dst_cache);
+ dev_put(dev);
+}
+
+static void ip6gre_tunnel_uninit(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
+
+ ip6gre_tunnel_unlink_md(ign, t);
+ ip6gre_tunnel_unlink(ign, t);
+ dst_cache_reset(&t->dst_cache);
+ dev_put(dev);
+}
+
+
+static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct net *net = dev_net(skb->dev);
+ const struct gre_base_hdr *greh;
+ const struct ipv6hdr *ipv6h;
+ int grehlen = sizeof(*greh);
+ struct ip6_tnl *t;
+ int key_off = 0;
+ __be16 flags;
+ __be32 key;
+
+ if (!pskb_may_pull(skb, offset + grehlen))
+ return;
+ greh = (const struct gre_base_hdr *)(skb->data + offset);
+ flags = greh->flags;
+ if (flags & (GRE_VERSION | GRE_ROUTING))
+ return;
+ if (flags & GRE_CSUM)
+ grehlen += 4;
+ if (flags & GRE_KEY) {
+ key_off = grehlen + offset;
+ grehlen += 4;
+ }
+
+ if (!pskb_may_pull(skb, offset + grehlen))
+ return;
+ ipv6h = (const struct ipv6hdr *)skb->data;
+ greh = (const struct gre_base_hdr *)(skb->data + offset);
+ key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
+
+ t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
+ key, greh->protocol);
+ if (!t)
+ return;
+
+ switch (type) {
+ struct ipv6_tlv_tnl_enc_lim *tel;
+ __u32 teli;
+ case ICMPV6_DEST_UNREACH:
+ net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
+ t->parms.name);
+ if (code != ICMPV6_PORT_UNREACH)
+ break;
+ return;
+ case ICMPV6_TIME_EXCEED:
+ if (code == ICMPV6_EXC_HOPLIMIT) {
+ net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
+ t->parms.name);
+ break;
+ }
+ return;
+ case ICMPV6_PARAMPROB:
+ teli = 0;
+ if (code == ICMPV6_HDR_FIELD)
+ teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
+
+ if (teli && teli == be32_to_cpu(info) - 2) {
+ tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
+ if (tel->encap_limit == 0) {
+ net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
+ t->parms.name);
+ }
+ } else {
+ net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
+ t->parms.name);
+ }
+ return;
+ case ICMPV6_PKT_TOOBIG:
+ ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
+ return;
+ case NDISC_REDIRECT:
+ ip6_redirect(skb, net, skb->dev->ifindex, 0,
+ sock_net_uid(net, NULL));
+ return;
+ }
+
+ if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
+ t->err_count++;
+ else
+ t->err_count = 1;
+ t->err_time = jiffies;
+}
+
+static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
+{
+ const struct ipv6hdr *ipv6h;
+ struct ip6_tnl *tunnel;
+
+ ipv6h = ipv6_hdr(skb);
+ tunnel = ip6gre_tunnel_lookup(skb->dev,
+ &ipv6h->saddr, &ipv6h->daddr, tpi->key,
+ tpi->proto);
+ if (tunnel) {
+ if (tunnel->parms.collect_md) {
+ struct metadata_dst *tun_dst;
+ __be64 tun_id;
+ __be16 flags;
+
+ flags = tpi->flags;
+ tun_id = key32_to_tunnel_id(tpi->key);
+
+ tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
+ if (!tun_dst)
+ return PACKET_REJECT;
+
+ ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
+ } else {
+ ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
+ }
+
+ return PACKET_RCVD;
+ }
+
+ return PACKET_REJECT;
+}
+
+static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
+ struct tnl_ptk_info *tpi)
+{
+ struct erspan_base_hdr *ershdr;
+ struct erspan_metadata *pkt_md;
+ const struct ipv6hdr *ipv6h;
+ struct erspan_md2 *md2;
+ struct ip6_tnl *tunnel;
+ u8 ver;
+
+ if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
+ return PACKET_REJECT;
+
+ ipv6h = ipv6_hdr(skb);
+ ershdr = (struct erspan_base_hdr *)skb->data;
+ ver = ershdr->ver;
+ tpi->key = cpu_to_be32(get_session_id(ershdr));
+
+ tunnel = ip6gre_tunnel_lookup(skb->dev,
+ &ipv6h->saddr, &ipv6h->daddr, tpi->key,
+ tpi->proto);
+ if (tunnel) {
+ int len = erspan_hdr_len(ver);
+
+ if (unlikely(!pskb_may_pull(skb, len)))
+ return PACKET_REJECT;
+
+ ershdr = (struct erspan_base_hdr *)skb->data;
+ pkt_md = (struct erspan_metadata *)(ershdr + 1);
+
+ if (__iptunnel_pull_header(skb, len,
+ htons(ETH_P_TEB),
+ false, false) < 0)
+ return PACKET_REJECT;
+
+ if (tunnel->parms.collect_md) {
+ struct metadata_dst *tun_dst;
+ struct ip_tunnel_info *info;
+ struct erspan_metadata *md;
+ __be64 tun_id;
+ __be16 flags;
+
+ tpi->flags |= TUNNEL_KEY;
+ flags = tpi->flags;
+ tun_id = key32_to_tunnel_id(tpi->key);
+
+ tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
+ sizeof(*md));
+ if (!tun_dst)
+ return PACKET_REJECT;
+
+ info = &tun_dst->u.tun_info;
+ md = ip_tunnel_info_opts(info);
+ md->version = ver;
+ md2 = &md->u.md2;
+ memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
+ ERSPAN_V2_MDSIZE);
+ info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
+ info->options_len = sizeof(*md);
+
+ ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
+
+ } else {
+ ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
+ }
+
+ return PACKET_RCVD;
+ }
+
+ return PACKET_REJECT;
+}
+
+static int gre_rcv(struct sk_buff *skb)
+{
+ struct tnl_ptk_info tpi;
+ bool csum_err = false;
+ int hdr_len;
+
+ hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
+ if (hdr_len < 0)
+ goto drop;
+
+ if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
+ goto drop;
+
+ if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
+ tpi.proto == htons(ETH_P_ERSPAN2))) {
+ if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
+ return 0;
+ goto out;
+ }
+
+ if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
+ return 0;
+
+out:
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int gre_handle_offloads(struct sk_buff *skb, bool csum)
+{
+ return iptunnel_handle_offloads(skb,
+ csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
+}
+
+static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
+ struct net_device *dev,
+ struct flowi6 *fl6, __u8 *dsfield,
+ int *encap_limit)
+{
+ const struct iphdr *iph = ip_hdr(skb);
+ struct ip6_tnl *t = netdev_priv(dev);
+
+ if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ *encap_limit = t->parms.encap_limit;
+
+ memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
+
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
+ *dsfield = ipv4_get_dsfield(iph);
+ else
+ *dsfield = ip6_tclass(t->parms.flowinfo);
+
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
+ fl6->flowi6_mark = skb->mark;
+ else
+ fl6->flowi6_mark = t->parms.fwmark;
+
+ fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
+}
+
+static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
+ struct net_device *dev,
+ struct flowi6 *fl6, __u8 *dsfield,
+ int *encap_limit)
+{
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ struct ip6_tnl *t = netdev_priv(dev);
+ __u16 offset;
+
+ offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
+ /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
+
+ if (offset > 0) {
+ struct ipv6_tlv_tnl_enc_lim *tel;
+
+ tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
+ if (tel->encap_limit == 0) {
+ icmpv6_send(skb, ICMPV6_PARAMPROB,
+ ICMPV6_HDR_FIELD, offset + 2);
+ return -1;
+ }
+ *encap_limit = tel->encap_limit - 1;
+ } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
+ *encap_limit = t->parms.encap_limit;
+ }
+
+ memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
+
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
+ *dsfield = ipv6_get_dsfield(ipv6h);
+ else
+ *dsfield = ip6_tclass(t->parms.flowinfo);
+
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
+ fl6->flowlabel |= ip6_flowlabel(ipv6h);
+
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
+ fl6->flowi6_mark = skb->mark;
+ else
+ fl6->flowi6_mark = t->parms.fwmark;
+
+ fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
+
+ return 0;
+}
+
+static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
+ struct net_device *dev, __u8 dsfield,
+ struct flowi6 *fl6, int encap_limit,
+ __u32 *pmtu, __be16 proto)
+{
+ struct ip6_tnl *tunnel = netdev_priv(dev);
+ __be16 protocol;
+
+ if (dev->type == ARPHRD_ETHER)
+ IPCB(skb)->flags = 0;
+
+ if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
+ fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
+ else
+ fl6->daddr = tunnel->parms.raddr;
+
+ if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
+ return -ENOMEM;
+
+ /* Push GRE header. */
+ protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
+
+ if (tunnel->parms.collect_md) {
+ struct ip_tunnel_info *tun_info;
+ const struct ip_tunnel_key *key;
+ __be16 flags;
+
+ tun_info = skb_tunnel_info(skb);
+ if (unlikely(!tun_info ||
+ !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
+ ip_tunnel_info_af(tun_info) != AF_INET6))
+ return -EINVAL;
+
+ key = &tun_info->key;
+ memset(fl6, 0, sizeof(*fl6));
+ fl6->flowi6_proto = IPPROTO_GRE;
+ fl6->daddr = key->u.ipv6.dst;
+ fl6->flowlabel = key->label;
+ fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
+
+ dsfield = key->tos;
+ flags = key->tun_flags &
+ (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
+ tunnel->tun_hlen = gre_calc_hlen(flags);
+
+ gre_build_header(skb, tunnel->tun_hlen,
+ flags, protocol,
+ tunnel_id_to_key32(tun_info->key.tun_id),
+ (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
+ : 0);
+
+ } else {
+ if (tunnel->parms.o_flags & TUNNEL_SEQ)
+ tunnel->o_seqno++;
+
+ gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
+ protocol, tunnel->parms.o_key,
+ htonl(tunnel->o_seqno));
+ }
+
+ return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
+ NEXTHDR_GRE);
+}
+
+static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ int encap_limit = -1;
+ struct flowi6 fl6;
+ __u8 dsfield = 0;
+ __u32 mtu;
+ int err;
+
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+
+ if (!t->parms.collect_md)
+ prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
+ &dsfield, &encap_limit);
+
+ err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
+ if (err)
+ return -1;
+
+ err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
+ skb->protocol);
+ if (err != 0) {
+ /* XXX: send ICMP error even if DF is not set. */
+ if (err == -EMSGSIZE)
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+ htonl(mtu));
+ return -1;
+ }
+
+ return 0;
+}
+
+static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ int encap_limit = -1;
+ struct flowi6 fl6;
+ __u8 dsfield = 0;
+ __u32 mtu;
+ int err;
+
+ if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
+ return -1;
+
+ if (!t->parms.collect_md &&
+ prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
+ return -1;
+
+ if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
+ return -1;
+
+ err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
+ &mtu, skb->protocol);
+ if (err != 0) {
+ if (err == -EMSGSIZE)
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ return -1;
+ }
+
+ return 0;
+}
+
+/**
+ * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
+ * @t: the outgoing tunnel device
+ * @hdr: IPv6 header from the incoming packet
+ *
+ * Description:
+ * Avoid trivial tunneling loop by checking that tunnel exit-point
+ * doesn't match source of incoming packet.
+ *
+ * Return:
+ * 1 if conflict,
+ * 0 else
+ **/
+
+static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
+ const struct ipv6hdr *hdr)
+{
+ return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
+}
+
+static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ int encap_limit = -1;
+ struct flowi6 fl6;
+ __u32 mtu;
+ int err;
+
+ if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ encap_limit = t->parms.encap_limit;
+
+ if (!t->parms.collect_md)
+ memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
+
+ err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
+ if (err)
+ return err;
+
+ err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
+
+ return err;
+}
+
+static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net_device_stats *stats = &t->dev->stats;
+ int ret;
+
+ if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
+ goto tx_err;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ ret = ip6gre_xmit_ipv4(skb, dev);
+ break;
+ case htons(ETH_P_IPV6):
+ ret = ip6gre_xmit_ipv6(skb, dev);
+ break;
+ default:
+ ret = ip6gre_xmit_other(skb, dev);
+ break;
+ }
+
+ if (ret < 0)
+ goto tx_err;
+
+ return NETDEV_TX_OK;
+
+tx_err:
+ stats->tx_errors++;
+ stats->tx_dropped++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct dst_entry *dst = skb_dst(skb);
+ struct net_device_stats *stats;
+ bool truncate = false;
+ int encap_limit = -1;
+ __u8 dsfield = false;
+ struct flowi6 fl6;
+ int err = -EINVAL;
+ __u32 mtu;
+ int nhoff;
+ int thoff;
+
+ if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
+ goto tx_err;
+
+ if (gre_handle_offloads(skb, false))
+ goto tx_err;
+
+ if (skb->len > dev->mtu + dev->hard_header_len) {
+ pskb_trim(skb, dev->mtu + dev->hard_header_len);
+ truncate = true;
+ }
+
+ nhoff = skb_network_header(skb) - skb_mac_header(skb);
+ if (skb->protocol == htons(ETH_P_IP) &&
+ (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
+ truncate = true;
+
+ thoff = skb_transport_header(skb) - skb_mac_header(skb);
+ if (skb->protocol == htons(ETH_P_IPV6) &&
+ (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
+ truncate = true;
+
+ if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
+ goto tx_err;
+
+ t->parms.o_flags &= ~TUNNEL_KEY;
+ IPCB(skb)->flags = 0;
+
+ /* For collect_md mode, derive fl6 from the tunnel key,
+ * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
+ */
+ if (t->parms.collect_md) {
+ struct ip_tunnel_info *tun_info;
+ const struct ip_tunnel_key *key;
+ struct erspan_metadata *md;
+ __be32 tun_id;
+
+ tun_info = skb_tunnel_info(skb);
+ if (unlikely(!tun_info ||
+ !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
+ ip_tunnel_info_af(tun_info) != AF_INET6))
+ return -EINVAL;
+
+ key = &tun_info->key;
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_GRE;
+ fl6.daddr = key->u.ipv6.dst;
+ fl6.flowlabel = key->label;
+ fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
+
+ dsfield = key->tos;
+ if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
+ goto tx_err;
+ md = ip_tunnel_info_opts(tun_info);
+ if (!md)
+ goto tx_err;
+
+ tun_id = tunnel_id_to_key32(key->tun_id);
+ if (md->version == 1) {
+ erspan_build_header(skb,
+ ntohl(tun_id),
+ ntohl(md->u.index), truncate,
+ false);
+ } else if (md->version == 2) {
+ erspan_build_header_v2(skb,
+ ntohl(tun_id),
+ md->u.md2.dir,
+ get_hwid(&md->u.md2),
+ truncate, false);
+ } else {
+ goto tx_err;
+ }
+ } else {
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+ prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
+ &dsfield, &encap_limit);
+ break;
+ case htons(ETH_P_IPV6):
+ if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
+ goto tx_err;
+ if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
+ &dsfield, &encap_limit))
+ goto tx_err;
+ break;
+ default:
+ memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
+ break;
+ }
+
+ if (t->parms.erspan_ver == 1)
+ erspan_build_header(skb, ntohl(t->parms.o_key),
+ t->parms.index,
+ truncate, false);
+ else if (t->parms.erspan_ver == 2)
+ erspan_build_header_v2(skb, ntohl(t->parms.o_key),
+ t->parms.dir,
+ t->parms.hwid,
+ truncate, false);
+ else
+ goto tx_err;
+
+ fl6.daddr = t->parms.raddr;
+ }
+
+ /* Push GRE header. */
+ gre_build_header(skb, 8, TUNNEL_SEQ,
+ htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
+
+ /* TooBig packet may have updated dst->dev's mtu */
+ if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
+ dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
+
+ err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
+ NEXTHDR_GRE);
+ if (err != 0) {
+ /* XXX: send ICMP error even if DF is not set. */
+ if (err == -EMSGSIZE) {
+ if (skb->protocol == htons(ETH_P_IP))
+ icmp_send(skb, ICMP_DEST_UNREACH,
+ ICMP_FRAG_NEEDED, htonl(mtu));
+ else
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ }
+
+ goto tx_err;
+ }
+ return NETDEV_TX_OK;
+
+tx_err:
+ stats = &t->dev->stats;
+ stats->tx_errors++;
+ stats->tx_dropped++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
+{
+ struct net_device *dev = t->dev;
+ struct __ip6_tnl_parm *p = &t->parms;
+ struct flowi6 *fl6 = &t->fl.u.ip6;
+
+ if (dev->type != ARPHRD_ETHER) {
+ memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
+ memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
+ }
+
+ /* Set up flowi template */
+ fl6->saddr = p->laddr;
+ fl6->daddr = p->raddr;
+ fl6->flowi6_oif = p->link;
+ fl6->flowlabel = 0;
+ fl6->flowi6_proto = IPPROTO_GRE;
+
+ if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
+ fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
+ if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
+ fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
+
+ p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
+ p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
+
+ if (p->flags&IP6_TNL_F_CAP_XMIT &&
+ p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
+ dev->flags |= IFF_POINTOPOINT;
+ else
+ dev->flags &= ~IFF_POINTOPOINT;
+}
+
+static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
+ int t_hlen)
+{
+ const struct __ip6_tnl_parm *p = &t->parms;
+ struct net_device *dev = t->dev;
+
+ if (p->flags & IP6_TNL_F_CAP_XMIT) {
+ int strict = (ipv6_addr_type(&p->raddr) &
+ (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
+
+ struct rt6_info *rt = rt6_lookup(t->net,
+ &p->raddr, &p->laddr,
+ p->link, NULL, strict);
+
+ if (!rt)
+ return;
+
+ if (rt->dst.dev) {
+ dev->needed_headroom = rt->dst.dev->hard_header_len +
+ t_hlen;
+
+ if (set_mtu) {
+ dev->mtu = rt->dst.dev->mtu - t_hlen;
+ if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ dev->mtu -= 8;
+ if (dev->type == ARPHRD_ETHER)
+ dev->mtu -= ETH_HLEN;
+
+ if (dev->mtu < IPV6_MIN_MTU)
+ dev->mtu = IPV6_MIN_MTU;
+ }
+ }
+ ip6_rt_put(rt);
+ }
+}
+
+static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
+{
+ int t_hlen;
+
+ tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
+ tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
+
+ t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
+ tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
+ return t_hlen;
+}
+
+static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
+{
+ ip6gre_tnl_link_config_common(t);
+ ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
+}
+
+static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
+ const struct __ip6_tnl_parm *p)
+{
+ t->parms.laddr = p->laddr;
+ t->parms.raddr = p->raddr;
+ t->parms.flags = p->flags;
+ t->parms.hop_limit = p->hop_limit;
+ t->parms.encap_limit = p->encap_limit;
+ t->parms.flowinfo = p->flowinfo;
+ t->parms.link = p->link;
+ t->parms.proto = p->proto;
+ t->parms.i_key = p->i_key;
+ t->parms.o_key = p->o_key;
+ t->parms.i_flags = p->i_flags;
+ t->parms.o_flags = p->o_flags;
+ t->parms.fwmark = p->fwmark;
+ dst_cache_reset(&t->dst_cache);
+}
+
+static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
+ int set_mtu)
+{
+ ip6gre_tnl_copy_tnl_parm(t, p);
+ ip6gre_tnl_link_config(t, set_mtu);
+ return 0;
+}
+
+static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
+ const struct ip6_tnl_parm2 *u)
+{
+ p->laddr = u->laddr;
+ p->raddr = u->raddr;
+ p->flags = u->flags;
+ p->hop_limit = u->hop_limit;
+ p->encap_limit = u->encap_limit;
+ p->flowinfo = u->flowinfo;
+ p->link = u->link;
+ p->i_key = u->i_key;
+ p->o_key = u->o_key;
+ p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
+ p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
+ memcpy(p->name, u->name, sizeof(u->name));
+}
+
+static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
+ const struct __ip6_tnl_parm *p)
+{
+ u->proto = IPPROTO_GRE;
+ u->laddr = p->laddr;
+ u->raddr = p->raddr;
+ u->flags = p->flags;
+ u->hop_limit = p->hop_limit;
+ u->encap_limit = p->encap_limit;
+ u->flowinfo = p->flowinfo;
+ u->link = p->link;
+ u->i_key = p->i_key;
+ u->o_key = p->o_key;
+ u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
+ u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
+ memcpy(u->name, p->name, sizeof(u->name));
+}
+
+static int ip6gre_tunnel_ioctl(struct net_device *dev,
+ struct ifreq *ifr, int cmd)
+{
+ int err = 0;
+ struct ip6_tnl_parm2 p;
+ struct __ip6_tnl_parm p1;
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net *net = t->net;
+ struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
+
+ memset(&p1, 0, sizeof(p1));
+
+ switch (cmd) {
+ case SIOCGETTUNNEL:
+ if (dev == ign->fb_tunnel_dev) {
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
+ err = -EFAULT;
+ break;
+ }
+ ip6gre_tnl_parm_from_user(&p1, &p);
+ t = ip6gre_tunnel_locate(net, &p1, 0);
+ if (!t)
+ t = netdev_priv(dev);
+ }
+ memset(&p, 0, sizeof(p));
+ ip6gre_tnl_parm_to_user(&p, &t->parms);
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
+ err = -EFAULT;
+ break;
+
+ case SIOCADDTUNNEL:
+ case SIOCCHGTUNNEL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ goto done;
+
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ goto done;
+
+ err = -EINVAL;
+ if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
+ goto done;
+
+ if (!(p.i_flags&GRE_KEY))
+ p.i_key = 0;
+ if (!(p.o_flags&GRE_KEY))
+ p.o_key = 0;
+
+ ip6gre_tnl_parm_from_user(&p1, &p);
+ t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
+
+ if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
+ if (t) {
+ if (t->dev != dev) {
+ err = -EEXIST;
+ break;
+ }
+ } else {
+ t = netdev_priv(dev);
+
+ ip6gre_tunnel_unlink(ign, t);
+ synchronize_net();
+ ip6gre_tnl_change(t, &p1, 1);
+ ip6gre_tunnel_link(ign, t);
+ netdev_state_change(dev);
+ }
+ }
+
+ if (t) {
+ err = 0;
+
+ memset(&p, 0, sizeof(p));
+ ip6gre_tnl_parm_to_user(&p, &t->parms);
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
+ err = -EFAULT;
+ } else
+ err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
+ break;
+
+ case SIOCDELTUNNEL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ goto done;
+
+ if (dev == ign->fb_tunnel_dev) {
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ goto done;
+ err = -ENOENT;
+ ip6gre_tnl_parm_from_user(&p1, &p);
+ t = ip6gre_tunnel_locate(net, &p1, 0);
+ if (!t)
+ goto done;
+ err = -EPERM;
+ if (t == netdev_priv(ign->fb_tunnel_dev))
+ goto done;
+ dev = t->dev;
+ }
+ unregister_netdevice(dev);
+ err = 0;
+ break;
+
+ default:
+ err = -EINVAL;
+ }
+
+done:
+ return err;
+}
+
+static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type, const void *daddr,
+ const void *saddr, unsigned int len)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct ipv6hdr *ipv6h;
+ __be16 *p;
+
+ ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
+ ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
+ t->fl.u.ip6.flowlabel,
+ true, &t->fl.u.ip6));
+ ipv6h->hop_limit = t->parms.hop_limit;
+ ipv6h->nexthdr = NEXTHDR_GRE;
+ ipv6h->saddr = t->parms.laddr;
+ ipv6h->daddr = t->parms.raddr;
+
+ p = (__be16 *)(ipv6h + 1);
+ p[0] = t->parms.o_flags;
+ p[1] = htons(type);
+
+ /*
+ * Set the source hardware address.
+ */
+
+ if (saddr)
+ memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
+ if (daddr)
+ memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
+ if (!ipv6_addr_any(&ipv6h->daddr))
+ return t->hlen;
+
+ return -t->hlen;
+}
+
+static const struct header_ops ip6gre_header_ops = {
+ .create = ip6gre_header,
+};
+
+static const struct net_device_ops ip6gre_netdev_ops = {
+ .ndo_init = ip6gre_tunnel_init,
+ .ndo_uninit = ip6gre_tunnel_uninit,
+ .ndo_start_xmit = ip6gre_tunnel_xmit,
+ .ndo_do_ioctl = ip6gre_tunnel_ioctl,
+ .ndo_change_mtu = ip6_tnl_change_mtu,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
+ .ndo_get_iflink = ip6_tnl_get_iflink,
+};
+
+static void ip6gre_dev_free(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+
+ gro_cells_destroy(&t->gro_cells);
+ dst_cache_destroy(&t->dst_cache);
+ free_percpu(dev->tstats);
+}
+
+static void ip6gre_tunnel_setup(struct net_device *dev)
+{
+ dev->netdev_ops = &ip6gre_netdev_ops;
+ dev->needs_free_netdev = true;
+ dev->priv_destructor = ip6gre_dev_free;
+
+ dev->type = ARPHRD_IP6GRE;
+
+ dev->flags |= IFF_NOARP;
+ dev->addr_len = sizeof(struct in6_addr);
+ netif_keep_dst(dev);
+ /* This perm addr will be used as interface identifier by IPv6 */
+ dev->addr_assign_type = NET_ADDR_RANDOM;
+ eth_random_addr(dev->perm_addr);
+}
+
+#define GRE6_FEATURES (NETIF_F_SG | \
+ NETIF_F_FRAGLIST | \
+ NETIF_F_HIGHDMA | \
+ NETIF_F_HW_CSUM)
+
+static void ip6gre_tnl_init_features(struct net_device *dev)
+{
+ struct ip6_tnl *nt = netdev_priv(dev);
+
+ dev->features |= GRE6_FEATURES;
+ dev->hw_features |= GRE6_FEATURES;
+
+ if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
+ /* TCP offload with GRE SEQ is not supported, nor
+ * can we support 2 levels of outer headers requiring
+ * an update.
+ */
+ if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
+ nt->encap.type == TUNNEL_ENCAP_NONE) {
+ dev->features |= NETIF_F_GSO_SOFTWARE;
+ dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+ }
+
+ /* Can use a lockless transmit, unless we generate
+ * output sequences
+ */
+ dev->features |= NETIF_F_LLTX;
+ }
+}
+
+static int ip6gre_tunnel_init_common(struct net_device *dev)
+{
+ struct ip6_tnl *tunnel;
+ int ret;
+ int t_hlen;
+
+ tunnel = netdev_priv(dev);
+
+ tunnel->dev = dev;
+ tunnel->net = dev_net(dev);
+ strcpy(tunnel->parms.name, dev->name);
+
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
+ if (ret)
+ goto cleanup_alloc_pcpu_stats;
+
+ ret = gro_cells_init(&tunnel->gro_cells, dev);
+ if (ret)
+ goto cleanup_dst_cache_init;
+
+ t_hlen = ip6gre_calc_hlen(tunnel);
+ dev->mtu = ETH_DATA_LEN - t_hlen;
+ if (dev->type == ARPHRD_ETHER)
+ dev->mtu -= ETH_HLEN;
+ if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ dev->mtu -= 8;
+
+ if (tunnel->parms.collect_md) {
+ dev->features |= NETIF_F_NETNS_LOCAL;
+ netif_keep_dst(dev);
+ }
+ ip6gre_tnl_init_features(dev);
+
+ return 0;
+
+cleanup_dst_cache_init:
+ dst_cache_destroy(&tunnel->dst_cache);
+cleanup_alloc_pcpu_stats:
+ free_percpu(dev->tstats);
+ dev->tstats = NULL;
+ return ret;
+}
+
+static int ip6gre_tunnel_init(struct net_device *dev)
+{
+ struct ip6_tnl *tunnel;
+ int ret;
+
+ ret = ip6gre_tunnel_init_common(dev);
+ if (ret)
+ return ret;
+
+ tunnel = netdev_priv(dev);
+
+ if (tunnel->parms.collect_md)
+ return 0;
+
+ memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
+ memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
+
+ if (ipv6_addr_any(&tunnel->parms.raddr))
+ dev->header_ops = &ip6gre_header_ops;
+
+ return 0;
+}
+
+static void ip6gre_fb_tunnel_init(struct net_device *dev)
+{
+ struct ip6_tnl *tunnel = netdev_priv(dev);
+
+ tunnel->dev = dev;
+ tunnel->net = dev_net(dev);
+ strcpy(tunnel->parms.name, dev->name);
+
+ tunnel->hlen = sizeof(struct ipv6hdr) + 4;
+
+ dev_hold(dev);
+}
+
+static struct inet6_protocol ip6gre_protocol __read_mostly = {
+ .handler = gre_rcv,
+ .err_handler = ip6gre_err,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
+{
+ struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
+ struct net_device *dev, *aux;
+ int prio;
+
+ for_each_netdev_safe(net, dev, aux)
+ if (dev->rtnl_link_ops == &ip6gre_link_ops ||
+ dev->rtnl_link_ops == &ip6gre_tap_ops ||
+ dev->rtnl_link_ops == &ip6erspan_tap_ops)
+ unregister_netdevice_queue(dev, head);
+
+ for (prio = 0; prio < 4; prio++) {
+ int h;
+ for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
+ struct ip6_tnl *t;
+
+ t = rtnl_dereference(ign->tunnels[prio][h]);
+
+ while (t) {
+ /* If dev is in the same netns, it has already
+ * been added to the list by the previous loop.
+ */
+ if (!net_eq(dev_net(t->dev), net))
+ unregister_netdevice_queue(t->dev,
+ head);
+ t = rtnl_dereference(t->next);
+ }
+ }
+ }
+}
+
+static int __net_init ip6gre_init_net(struct net *net)
+{
+ struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
+ int err;
+
+ if (!net_has_fallback_tunnels(net))
+ return 0;
+ ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
+ NET_NAME_UNKNOWN,
+ ip6gre_tunnel_setup);
+ if (!ign->fb_tunnel_dev) {
+ err = -ENOMEM;
+ goto err_alloc_dev;
+ }
+ dev_net_set(ign->fb_tunnel_dev, net);
+ /* FB netdevice is special: we have one, and only one per netns.
+ * Allowing to move it to another netns is clearly unsafe.
+ */
+ ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
+
+
+ ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
+ ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
+
+ err = register_netdev(ign->fb_tunnel_dev);
+ if (err)
+ goto err_reg_dev;
+
+ rcu_assign_pointer(ign->tunnels_wc[0],
+ netdev_priv(ign->fb_tunnel_dev));
+ return 0;
+
+err_reg_dev:
+ free_netdev(ign->fb_tunnel_dev);
+err_alloc_dev:
+ return err;
+}
+
+static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
+{
+ struct net *net;
+ LIST_HEAD(list);
+
+ rtnl_lock();
+ list_for_each_entry(net, net_list, exit_list)
+ ip6gre_destroy_tunnels(net, &list);
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+}
+
+static struct pernet_operations ip6gre_net_ops = {
+ .init = ip6gre_init_net,
+ .exit_batch = ip6gre_exit_batch_net,
+ .id = &ip6gre_net_id,
+ .size = sizeof(struct ip6gre_net),
+};
+
+static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ __be16 flags;
+
+ if (!data)
+ return 0;
+
+ flags = 0;
+ if (data[IFLA_GRE_IFLAGS])
+ flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
+ if (data[IFLA_GRE_OFLAGS])
+ flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
+ if (flags & (GRE_VERSION|GRE_ROUTING))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct in6_addr daddr;
+
+ if (tb[IFLA_ADDRESS]) {
+ if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
+ return -EINVAL;
+ if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
+ return -EADDRNOTAVAIL;
+ }
+
+ if (!data)
+ goto out;
+
+ if (data[IFLA_GRE_REMOTE]) {
+ daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
+ if (ipv6_addr_any(&daddr))
+ return -EINVAL;
+ }
+
+out:
+ return ip6gre_tunnel_validate(tb, data, extack);
+}
+
+static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ __be16 flags = 0;
+ int ret, ver = 0;
+
+ if (!data)
+ return 0;
+
+ ret = ip6gre_tap_validate(tb, data, extack);
+ if (ret)
+ return ret;
+
+ /* ERSPAN should only have GRE sequence and key flag */
+ if (data[IFLA_GRE_OFLAGS])
+ flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
+ if (data[IFLA_GRE_IFLAGS])
+ flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
+ if (!data[IFLA_GRE_COLLECT_METADATA] &&
+ flags != (GRE_SEQ | GRE_KEY))
+ return -EINVAL;
+
+ /* ERSPAN Session ID only has 10-bit. Since we reuse
+ * 32-bit key field as ID, check it's range.
+ */
+ if (data[IFLA_GRE_IKEY] &&
+ (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
+ return -EINVAL;
+
+ if (data[IFLA_GRE_OKEY] &&
+ (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
+ return -EINVAL;
+
+ if (data[IFLA_GRE_ERSPAN_VER]) {
+ ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
+ if (ver != 1 && ver != 2)
+ return -EINVAL;
+ }
+
+ if (ver == 1) {
+ if (data[IFLA_GRE_ERSPAN_INDEX]) {
+ u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
+
+ if (index & ~INDEX_MASK)
+ return -EINVAL;
+ }
+ } else if (ver == 2) {
+ if (data[IFLA_GRE_ERSPAN_DIR]) {
+ u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
+
+ if (dir & ~(DIR_MASK >> DIR_OFFSET))
+ return -EINVAL;
+ }
+
+ if (data[IFLA_GRE_ERSPAN_HWID]) {
+ u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
+
+ if (hwid & ~(HWID_MASK >> HWID_OFFSET))
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static void ip6gre_netlink_parms(struct nlattr *data[],
+ struct __ip6_tnl_parm *parms)
+{
+ memset(parms, 0, sizeof(*parms));
+
+ if (!data)
+ return;
+
+ if (data[IFLA_GRE_LINK])
+ parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
+
+ if (data[IFLA_GRE_IFLAGS])
+ parms->i_flags = gre_flags_to_tnl_flags(
+ nla_get_be16(data[IFLA_GRE_IFLAGS]));
+
+ if (data[IFLA_GRE_OFLAGS])
+ parms->o_flags = gre_flags_to_tnl_flags(
+ nla_get_be16(data[IFLA_GRE_OFLAGS]));
+
+ if (data[IFLA_GRE_IKEY])
+ parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
+
+ if (data[IFLA_GRE_OKEY])
+ parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
+
+ if (data[IFLA_GRE_LOCAL])
+ parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
+
+ if (data[IFLA_GRE_REMOTE])
+ parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
+
+ if (data[IFLA_GRE_TTL])
+ parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
+
+ if (data[IFLA_GRE_ENCAP_LIMIT])
+ parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
+
+ if (data[IFLA_GRE_FLOWINFO])
+ parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
+
+ if (data[IFLA_GRE_FLAGS])
+ parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
+
+ if (data[IFLA_GRE_FWMARK])
+ parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
+
+ if (data[IFLA_GRE_COLLECT_METADATA])
+ parms->collect_md = true;
+
+ parms->erspan_ver = 1;
+ if (data[IFLA_GRE_ERSPAN_VER])
+ parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
+
+ if (parms->erspan_ver == 1) {
+ if (data[IFLA_GRE_ERSPAN_INDEX])
+ parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
+ } else if (parms->erspan_ver == 2) {
+ if (data[IFLA_GRE_ERSPAN_DIR])
+ parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
+ if (data[IFLA_GRE_ERSPAN_HWID])
+ parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
+ }
+}
+
+static int ip6gre_tap_init(struct net_device *dev)
+{
+ int ret;
+
+ ret = ip6gre_tunnel_init_common(dev);
+ if (ret)
+ return ret;
+
+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+
+ return 0;
+}
+
+static const struct net_device_ops ip6gre_tap_netdev_ops = {
+ .ndo_init = ip6gre_tap_init,
+ .ndo_uninit = ip6gre_tunnel_uninit,
+ .ndo_start_xmit = ip6gre_tunnel_xmit,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_change_mtu = ip6_tnl_change_mtu,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
+ .ndo_get_iflink = ip6_tnl_get_iflink,
+};
+
+static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
+{
+ int t_hlen;
+
+ tunnel->tun_hlen = 8;
+ tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
+ erspan_hdr_len(tunnel->parms.erspan_ver);
+
+ t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
+ tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
+ return t_hlen;
+}
+
+static int ip6erspan_tap_init(struct net_device *dev)
+{
+ struct ip6_tnl *tunnel;
+ int t_hlen;
+ int ret;
+
+ tunnel = netdev_priv(dev);
+
+ tunnel->dev = dev;
+ tunnel->net = dev_net(dev);
+ strcpy(tunnel->parms.name, dev->name);
+
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
+ if (ret)
+ goto cleanup_alloc_pcpu_stats;
+
+ ret = gro_cells_init(&tunnel->gro_cells, dev);
+ if (ret)
+ goto cleanup_dst_cache_init;
+
+ t_hlen = ip6erspan_calc_hlen(tunnel);
+ dev->mtu = ETH_DATA_LEN - t_hlen;
+ if (dev->type == ARPHRD_ETHER)
+ dev->mtu -= ETH_HLEN;
+ if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ dev->mtu -= 8;
+
+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+ ip6erspan_tnl_link_config(tunnel, 1);
+
+ return 0;
+
+cleanup_dst_cache_init:
+ dst_cache_destroy(&tunnel->dst_cache);
+cleanup_alloc_pcpu_stats:
+ free_percpu(dev->tstats);
+ dev->tstats = NULL;
+ return ret;
+}
+
+static const struct net_device_ops ip6erspan_netdev_ops = {
+ .ndo_init = ip6erspan_tap_init,
+ .ndo_uninit = ip6erspan_tunnel_uninit,
+ .ndo_start_xmit = ip6erspan_tunnel_xmit,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_change_mtu = ip6_tnl_change_mtu,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
+ .ndo_get_iflink = ip6_tnl_get_iflink,
+};
+
+static void ip6gre_tap_setup(struct net_device *dev)
+{
+
+ ether_setup(dev);
+
+ dev->max_mtu = 0;
+ dev->netdev_ops = &ip6gre_tap_netdev_ops;
+ dev->needs_free_netdev = true;
+ dev->priv_destructor = ip6gre_dev_free;
+
+ dev->features |= NETIF_F_NETNS_LOCAL;
+ dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+ netif_keep_dst(dev);
+}
+
+bool is_ip6gretap_dev(const struct net_device *dev)
+{
+ return dev->netdev_ops == &ip6gre_tap_netdev_ops;
+}
+EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
+
+static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
+ struct ip_tunnel_encap *ipencap)
+{
+ bool ret = false;
+
+ memset(ipencap, 0, sizeof(*ipencap));
+
+ if (!data)
+ return ret;
+
+ if (data[IFLA_GRE_ENCAP_TYPE]) {
+ ret = true;
+ ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
+ }
+
+ if (data[IFLA_GRE_ENCAP_FLAGS]) {
+ ret = true;
+ ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
+ }
+
+ if (data[IFLA_GRE_ENCAP_SPORT]) {
+ ret = true;
+ ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
+ }
+
+ if (data[IFLA_GRE_ENCAP_DPORT]) {
+ ret = true;
+ ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
+ }
+
+ return ret;
+}
+
+static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct ip6_tnl *nt;
+ struct ip_tunnel_encap ipencap;
+ int err;
+
+ nt = netdev_priv(dev);
+
+ if (ip6gre_netlink_encap_parms(data, &ipencap)) {
+ int err = ip6_tnl_encap_setup(nt, &ipencap);
+
+ if (err < 0)
+ return err;
+ }
+
+ if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
+ eth_hw_addr_random(dev);
+
+ nt->dev = dev;
+ nt->net = dev_net(dev);
+
+ err = register_netdevice(dev);
+ if (err)
+ goto out;
+
+ if (tb[IFLA_MTU])
+ ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
+
+ dev_hold(dev);
+
+out:
+ return err;
+}
+
+static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct ip6_tnl *nt = netdev_priv(dev);
+ struct net *net = dev_net(dev);
+ struct ip6gre_net *ign;
+ int err;
+
+ ip6gre_netlink_parms(data, &nt->parms);
+ ign = net_generic(net, ip6gre_net_id);
+
+ if (nt->parms.collect_md) {
+ if (rtnl_dereference(ign->collect_md_tun))
+ return -EEXIST;
+ } else {
+ if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
+ return -EEXIST;
+ }
+
+ err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
+ if (!err) {
+ ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
+ ip6gre_tunnel_link_md(ign, nt);
+ ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
+ }
+ return err;
+}
+
+static struct ip6_tnl *
+ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[], struct __ip6_tnl_parm *p_p,
+ struct netlink_ext_ack *extack)
+{
+ struct ip6_tnl *t, *nt = netdev_priv(dev);
+ struct net *net = nt->net;
+ struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
+ struct ip_tunnel_encap ipencap;
+
+ if (dev == ign->fb_tunnel_dev)
+ return ERR_PTR(-EINVAL);
+
+ if (ip6gre_netlink_encap_parms(data, &ipencap)) {
+ int err = ip6_tnl_encap_setup(nt, &ipencap);
+
+ if (err < 0)
+ return ERR_PTR(err);
+ }
+
+ ip6gre_netlink_parms(data, p_p);
+
+ t = ip6gre_tunnel_locate(net, p_p, 0);
+
+ if (t) {
+ if (t->dev != dev)
+ return ERR_PTR(-EEXIST);
+ } else {
+ t = nt;
+ }
+
+ return t;
+}
+
+static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
+ struct __ip6_tnl_parm p;
+ struct ip6_tnl *t;
+
+ t = ip6gre_changelink_common(dev, tb, data, &p, extack);
+ if (IS_ERR(t))
+ return PTR_ERR(t);
+
+ ip6gre_tunnel_unlink_md(ign, t);
+ ip6gre_tunnel_unlink(ign, t);
+ ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
+ ip6gre_tunnel_link_md(ign, t);
+ ip6gre_tunnel_link(ign, t);
+ return 0;
+}
+
+static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct net *net = dev_net(dev);
+ struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
+
+ if (dev != ign->fb_tunnel_dev)
+ unregister_netdevice_queue(dev, head);
+}
+
+static size_t ip6gre_get_size(const struct net_device *dev)
+{
+ return
+ /* IFLA_GRE_LINK */
+ nla_total_size(4) +
+ /* IFLA_GRE_IFLAGS */
+ nla_total_size(2) +
+ /* IFLA_GRE_OFLAGS */
+ nla_total_size(2) +
+ /* IFLA_GRE_IKEY */
+ nla_total_size(4) +
+ /* IFLA_GRE_OKEY */
+ nla_total_size(4) +
+ /* IFLA_GRE_LOCAL */
+ nla_total_size(sizeof(struct in6_addr)) +
+ /* IFLA_GRE_REMOTE */
+ nla_total_size(sizeof(struct in6_addr)) +
+ /* IFLA_GRE_TTL */
+ nla_total_size(1) +
+ /* IFLA_GRE_ENCAP_LIMIT */
+ nla_total_size(1) +
+ /* IFLA_GRE_FLOWINFO */
+ nla_total_size(4) +
+ /* IFLA_GRE_FLAGS */
+ nla_total_size(4) +
+ /* IFLA_GRE_ENCAP_TYPE */
+ nla_total_size(2) +
+ /* IFLA_GRE_ENCAP_FLAGS */
+ nla_total_size(2) +
+ /* IFLA_GRE_ENCAP_SPORT */
+ nla_total_size(2) +
+ /* IFLA_GRE_ENCAP_DPORT */
+ nla_total_size(2) +
+ /* IFLA_GRE_COLLECT_METADATA */
+ nla_total_size(0) +
+ /* IFLA_GRE_FWMARK */
+ nla_total_size(4) +
+ /* IFLA_GRE_ERSPAN_INDEX */
+ nla_total_size(4) +
+ 0;
+}
+
+static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct __ip6_tnl_parm *p = &t->parms;
+
+ if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
+ nla_put_be16(skb, IFLA_GRE_IFLAGS,
+ gre_tnl_flags_to_gre_flags(p->i_flags)) ||
+ nla_put_be16(skb, IFLA_GRE_OFLAGS,
+ gre_tnl_flags_to_gre_flags(p->o_flags)) ||
+ nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
+ nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
+ nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
+ nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
+ nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
+ nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
+ nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
+ nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
+ nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
+ nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
+ goto nla_put_failure;
+
+ if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
+ t->encap.type) ||
+ nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
+ t->encap.sport) ||
+ nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
+ t->encap.dport) ||
+ nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
+ t->encap.flags))
+ goto nla_put_failure;
+
+ if (p->collect_md) {
+ if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
+ goto nla_put_failure;
+ }
+
+ if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
+ goto nla_put_failure;
+
+ if (p->erspan_ver == 1) {
+ if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
+ goto nla_put_failure;
+ } else if (p->erspan_ver == 2) {
+ if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
+ goto nla_put_failure;
+ if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
+ goto nla_put_failure;
+ }
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
+ [IFLA_GRE_LINK] = { .type = NLA_U32 },
+ [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
+ [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
+ [IFLA_GRE_IKEY] = { .type = NLA_U32 },
+ [IFLA_GRE_OKEY] = { .type = NLA_U32 },
+ [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
+ [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
+ [IFLA_GRE_TTL] = { .type = NLA_U8 },
+ [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
+ [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
+ [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
+ [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
+ [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
+ [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
+ [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
+ [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
+ [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
+ [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
+ [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
+ [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
+ [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
+};
+
+static void ip6erspan_tap_setup(struct net_device *dev)
+{
+ ether_setup(dev);
+
+ dev->netdev_ops = &ip6erspan_netdev_ops;
+ dev->needs_free_netdev = true;
+ dev->priv_destructor = ip6gre_dev_free;
+
+ dev->features |= NETIF_F_NETNS_LOCAL;
+ dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+ netif_keep_dst(dev);
+}
+
+static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct ip6_tnl *nt = netdev_priv(dev);
+ struct net *net = dev_net(dev);
+ struct ip6gre_net *ign;
+ int err;
+
+ ip6gre_netlink_parms(data, &nt->parms);
+ ign = net_generic(net, ip6gre_net_id);
+
+ if (nt->parms.collect_md) {
+ if (rtnl_dereference(ign->collect_md_tun_erspan))
+ return -EEXIST;
+ } else {
+ if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
+ return -EEXIST;
+ }
+
+ err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
+ if (!err) {
+ ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
+ ip6erspan_tunnel_link_md(ign, nt);
+ ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
+ }
+ return err;
+}
+
+static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
+{
+ ip6gre_tnl_link_config_common(t);
+ ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
+}
+
+static int ip6erspan_tnl_change(struct ip6_tnl *t,
+ const struct __ip6_tnl_parm *p, int set_mtu)
+{
+ ip6gre_tnl_copy_tnl_parm(t, p);
+ ip6erspan_tnl_link_config(t, set_mtu);
+ return 0;
+}
+
+static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
+ struct __ip6_tnl_parm p;
+ struct ip6_tnl *t;
+
+ t = ip6gre_changelink_common(dev, tb, data, &p, extack);
+ if (IS_ERR(t))
+ return PTR_ERR(t);
+
+ ip6gre_tunnel_unlink_md(ign, t);
+ ip6gre_tunnel_unlink(ign, t);
+ ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
+ ip6erspan_tunnel_link_md(ign, t);
+ ip6gre_tunnel_link(ign, t);
+ return 0;
+}
+
+static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
+ .kind = "ip6gre",
+ .maxtype = IFLA_GRE_MAX,
+ .policy = ip6gre_policy,
+ .priv_size = sizeof(struct ip6_tnl),
+ .setup = ip6gre_tunnel_setup,
+ .validate = ip6gre_tunnel_validate,
+ .newlink = ip6gre_newlink,
+ .changelink = ip6gre_changelink,
+ .dellink = ip6gre_dellink,
+ .get_size = ip6gre_get_size,
+ .fill_info = ip6gre_fill_info,
+ .get_link_net = ip6_tnl_get_link_net,
+};
+
+static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
+ .kind = "ip6gretap",
+ .maxtype = IFLA_GRE_MAX,
+ .policy = ip6gre_policy,
+ .priv_size = sizeof(struct ip6_tnl),
+ .setup = ip6gre_tap_setup,
+ .validate = ip6gre_tap_validate,
+ .newlink = ip6gre_newlink,
+ .changelink = ip6gre_changelink,
+ .get_size = ip6gre_get_size,
+ .fill_info = ip6gre_fill_info,
+ .get_link_net = ip6_tnl_get_link_net,
+};
+
+static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
+ .kind = "ip6erspan",
+ .maxtype = IFLA_GRE_MAX,
+ .policy = ip6gre_policy,
+ .priv_size = sizeof(struct ip6_tnl),
+ .setup = ip6erspan_tap_setup,
+ .validate = ip6erspan_tap_validate,
+ .newlink = ip6erspan_newlink,
+ .changelink = ip6erspan_changelink,
+ .get_size = ip6gre_get_size,
+ .fill_info = ip6gre_fill_info,
+ .get_link_net = ip6_tnl_get_link_net,
+};
+
+/*
+ * And now the modules code and kernel interface.
+ */
+
+static int __init ip6gre_init(void)
+{
+ int err;
+
+ pr_info("GRE over IPv6 tunneling driver\n");
+
+ err = register_pernet_device(&ip6gre_net_ops);
+ if (err < 0)
+ return err;
+
+ err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
+ if (err < 0) {
+ pr_info("%s: can't add protocol\n", __func__);
+ goto add_proto_failed;
+ }
+
+ err = rtnl_link_register(&ip6gre_link_ops);
+ if (err < 0)
+ goto rtnl_link_failed;
+
+ err = rtnl_link_register(&ip6gre_tap_ops);
+ if (err < 0)
+ goto tap_ops_failed;
+
+ err = rtnl_link_register(&ip6erspan_tap_ops);
+ if (err < 0)
+ goto erspan_link_failed;
+
+out:
+ return err;
+
+erspan_link_failed:
+ rtnl_link_unregister(&ip6gre_tap_ops);
+tap_ops_failed:
+ rtnl_link_unregister(&ip6gre_link_ops);
+rtnl_link_failed:
+ inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
+add_proto_failed:
+ unregister_pernet_device(&ip6gre_net_ops);
+ goto out;
+}
+
+static void __exit ip6gre_fini(void)
+{
+ rtnl_link_unregister(&ip6gre_tap_ops);
+ rtnl_link_unregister(&ip6gre_link_ops);
+ rtnl_link_unregister(&ip6erspan_tap_ops);
+ inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
+ unregister_pernet_device(&ip6gre_net_ops);
+}
+
+module_init(ip6gre_init);
+module_exit(ip6gre_fini);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
+MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
+MODULE_ALIAS_RTNL_LINK("ip6gre");
+MODULE_ALIAS_RTNL_LINK("ip6gretap");
+MODULE_ALIAS_RTNL_LINK("ip6erspan");
+MODULE_ALIAS_NETDEV("ip6gre0");
diff --git a/net/ipv6/ip6_icmp.c b/net/ipv6/ip6_icmp.c
new file mode 100644
index 0000000..0204549
--- /dev/null
+++ b/net/ipv6/ip6_icmp.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/export.h>
+#include <linux/icmpv6.h>
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/spinlock.h>
+
+#include <net/ipv6.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+
+static ip6_icmp_send_t __rcu *ip6_icmp_send;
+
+int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
+{
+ return (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, NULL, fn) == NULL) ?
+ 0 : -EBUSY;
+}
+EXPORT_SYMBOL(inet6_register_icmp_sender);
+
+int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn)
+{
+ int ret;
+
+ ret = (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, fn, NULL) == fn) ?
+ 0 : -EINVAL;
+
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL(inet6_unregister_icmp_sender);
+
+void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
+{
+ ip6_icmp_send_t *send;
+
+ rcu_read_lock();
+ send = rcu_dereference(ip6_icmp_send);
+
+ if (!send)
+ goto out;
+ send(skb, type, code, info, NULL);
+out:
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(icmpv6_send);
+#endif
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
new file mode 100644
index 0000000..6b74523
--- /dev/null
+++ b/net/ipv6/ip6_input.c
@@ -0,0 +1,510 @@
+/*
+ * IPv6 input
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ * Ian P. Morris <I.P.Morris@soton.ac.uk>
+ *
+ * Based in linux/net/ipv4/ip_input.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+/* Changes
+ *
+ * Mitsuru KANDA @USAGI and
+ * YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs().
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/icmpv6.h>
+#include <linux/mroute6.h>
+#include <linux/slab.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/rawv6.h>
+#include <net/ndisc.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/xfrm.h>
+#include <net/inet_ecn.h>
+#include <net/dst_metadata.h>
+
+static void ip6_rcv_finish_core(struct net *net, struct sock *sk,
+ struct sk_buff *skb)
+{
+ void (*edemux)(struct sk_buff *skb);
+
+ if (net->ipv4.sysctl_ip_early_demux && !skb_dst(skb) && skb->sk == NULL) {
+ const struct inet6_protocol *ipprot;
+
+ ipprot = rcu_dereference(inet6_protos[ipv6_hdr(skb)->nexthdr]);
+ if (ipprot && (edemux = READ_ONCE(ipprot->early_demux)))
+ edemux(skb);
+ }
+ if (!skb_valid_dst(skb))
+ ip6_route_input(skb);
+}
+
+int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ /* if ingress device is enslaved to an L3 master device pass the
+ * skb to its handler for processing
+ */
+ skb = l3mdev_ip6_rcv(skb);
+ if (!skb)
+ return NET_RX_SUCCESS;
+ ip6_rcv_finish_core(net, sk, skb);
+
+ return dst_input(skb);
+}
+
+static void ip6_sublist_rcv_finish(struct list_head *head)
+{
+ struct sk_buff *skb, *next;
+
+ list_for_each_entry_safe(skb, next, head, list)
+ dst_input(skb);
+}
+
+static void ip6_list_rcv_finish(struct net *net, struct sock *sk,
+ struct list_head *head)
+{
+ struct dst_entry *curr_dst = NULL;
+ struct sk_buff *skb, *next;
+ struct list_head sublist;
+
+ INIT_LIST_HEAD(&sublist);
+ list_for_each_entry_safe(skb, next, head, list) {
+ struct dst_entry *dst;
+
+ skb_list_del_init(skb);
+ /* if ingress device is enslaved to an L3 master device pass the
+ * skb to its handler for processing
+ */
+ skb = l3mdev_ip6_rcv(skb);
+ if (!skb)
+ continue;
+ ip6_rcv_finish_core(net, sk, skb);
+ dst = skb_dst(skb);
+ if (curr_dst != dst) {
+ /* dispatch old sublist */
+ if (!list_empty(&sublist))
+ ip6_sublist_rcv_finish(&sublist);
+ /* start new sublist */
+ INIT_LIST_HEAD(&sublist);
+ curr_dst = dst;
+ }
+ list_add_tail(&skb->list, &sublist);
+ }
+ /* dispatch final sublist */
+ ip6_sublist_rcv_finish(&sublist);
+}
+
+static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
+ struct net *net)
+{
+ const struct ipv6hdr *hdr;
+ u32 pkt_len;
+ struct inet6_dev *idev;
+
+ if (skb->pkt_type == PACKET_OTHERHOST) {
+ kfree_skb(skb);
+ return NULL;
+ }
+
+ rcu_read_lock();
+
+ idev = __in6_dev_get(skb->dev);
+
+ __IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_IN, skb->len);
+
+ if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
+ !idev || unlikely(idev->cnf.disable_ipv6)) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
+ goto drop;
+ }
+
+ memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
+
+ /*
+ * Store incoming device index. When the packet will
+ * be queued, we cannot refer to skb->dev anymore.
+ *
+ * BTW, when we send a packet for our own local address on a
+ * non-loopback interface (e.g. ethX), it is being delivered
+ * via the loopback interface (lo) here; skb->dev = loopback_dev.
+ * It, however, should be considered as if it is being
+ * arrived via the sending interface (ethX), because of the
+ * nature of scoping architecture. --yoshfuji
+ */
+ IP6CB(skb)->iif = skb_valid_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex;
+
+ if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
+ goto err;
+
+ hdr = ipv6_hdr(skb);
+
+ if (hdr->version != 6)
+ goto err;
+
+ __IP6_ADD_STATS(net, idev,
+ IPSTATS_MIB_NOECTPKTS +
+ (ipv6_get_dsfield(hdr) & INET_ECN_MASK),
+ max_t(unsigned short, 1, skb_shinfo(skb)->gso_segs));
+ /*
+ * RFC4291 2.5.3
+ * The loopback address must not be used as the source address in IPv6
+ * packets that are sent outside of a single node. [..]
+ * A packet received on an interface with a destination address
+ * of loopback must be dropped.
+ */
+ if ((ipv6_addr_loopback(&hdr->saddr) ||
+ ipv6_addr_loopback(&hdr->daddr)) &&
+ !(dev->flags & IFF_LOOPBACK))
+ goto err;
+
+ /* RFC4291 Errata ID: 3480
+ * Interface-Local scope spans only a single interface on a
+ * node and is useful only for loopback transmission of
+ * multicast. Packets with interface-local scope received
+ * from another node must be discarded.
+ */
+ if (!(skb->pkt_type == PACKET_LOOPBACK ||
+ dev->flags & IFF_LOOPBACK) &&
+ ipv6_addr_is_multicast(&hdr->daddr) &&
+ IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 1)
+ goto err;
+
+ /* If enabled, drop unicast packets that were encapsulated in link-layer
+ * multicast or broadcast to protected against the so-called "hole-196"
+ * attack in 802.11 wireless.
+ */
+ if (!ipv6_addr_is_multicast(&hdr->daddr) &&
+ (skb->pkt_type == PACKET_BROADCAST ||
+ skb->pkt_type == PACKET_MULTICAST) &&
+ idev->cnf.drop_unicast_in_l2_multicast)
+ goto err;
+
+ /* RFC4291 2.7
+ * Nodes must not originate a packet to a multicast address whose scope
+ * field contains the reserved value 0; if such a packet is received, it
+ * must be silently dropped.
+ */
+ if (ipv6_addr_is_multicast(&hdr->daddr) &&
+ IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 0)
+ goto err;
+
+ /*
+ * RFC4291 2.7
+ * Multicast addresses must not be used as source addresses in IPv6
+ * packets or appear in any Routing header.
+ */
+ if (ipv6_addr_is_multicast(&hdr->saddr))
+ goto err;
+
+ skb->transport_header = skb->network_header + sizeof(*hdr);
+ IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
+
+ pkt_len = ntohs(hdr->payload_len);
+
+ /* pkt_len may be zero if Jumbo payload option is present */
+ if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
+ if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
+ __IP6_INC_STATS(net,
+ idev, IPSTATS_MIB_INTRUNCATEDPKTS);
+ goto drop;
+ }
+ if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ goto drop;
+ }
+ hdr = ipv6_hdr(skb);
+ }
+
+ if (hdr->nexthdr == NEXTHDR_HOP) {
+ if (ipv6_parse_hopopts(skb) < 0) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+ rcu_read_unlock();
+ return NULL;
+ }
+ }
+
+ rcu_read_unlock();
+
+ /* Must drop socket now because of tproxy. */
+ skb_orphan(skb);
+
+ return skb;
+err:
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+drop:
+ rcu_read_unlock();
+ kfree_skb(skb);
+ return NULL;
+}
+
+int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
+{
+ struct net *net = dev_net(skb->dev);
+
+ skb = ip6_rcv_core(skb, dev, net);
+ if (skb == NULL)
+ return NET_RX_DROP;
+ return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
+ net, NULL, skb, dev, NULL,
+ ip6_rcv_finish);
+}
+
+static void ip6_sublist_rcv(struct list_head *head, struct net_device *dev,
+ struct net *net)
+{
+ NF_HOOK_LIST(NFPROTO_IPV6, NF_INET_PRE_ROUTING, net, NULL,
+ head, dev, NULL, ip6_rcv_finish);
+ ip6_list_rcv_finish(net, NULL, head);
+}
+
+/* Receive a list of IPv6 packets */
+void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
+ struct net_device *orig_dev)
+{
+ struct net_device *curr_dev = NULL;
+ struct net *curr_net = NULL;
+ struct sk_buff *skb, *next;
+ struct list_head sublist;
+
+ INIT_LIST_HEAD(&sublist);
+ list_for_each_entry_safe(skb, next, head, list) {
+ struct net_device *dev = skb->dev;
+ struct net *net = dev_net(dev);
+
+ skb_list_del_init(skb);
+ skb = ip6_rcv_core(skb, dev, net);
+ if (skb == NULL)
+ continue;
+
+ if (curr_dev != dev || curr_net != net) {
+ /* dispatch old sublist */
+ if (!list_empty(&sublist))
+ ip6_sublist_rcv(&sublist, curr_dev, curr_net);
+ /* start new sublist */
+ INIT_LIST_HEAD(&sublist);
+ curr_dev = dev;
+ curr_net = net;
+ }
+ list_add_tail(&skb->list, &sublist);
+ }
+ /* dispatch final sublist */
+ ip6_sublist_rcv(&sublist, curr_dev, curr_net);
+}
+
+/*
+ * Deliver the packet to the host
+ */
+
+
+static int ip6_input_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ const struct inet6_protocol *ipprot;
+ struct inet6_dev *idev;
+ unsigned int nhoff;
+ int nexthdr;
+ bool raw;
+ bool have_final = false;
+
+ /*
+ * Parse extension headers
+ */
+
+ rcu_read_lock();
+resubmit:
+ idev = ip6_dst_idev(skb_dst(skb));
+ if (!pskb_pull(skb, skb_transport_offset(skb)))
+ goto discard;
+ nhoff = IP6CB(skb)->nhoff;
+ nexthdr = skb_network_header(skb)[nhoff];
+
+resubmit_final:
+ raw = raw6_local_deliver(skb, nexthdr);
+ ipprot = rcu_dereference(inet6_protos[nexthdr]);
+ if (ipprot) {
+ int ret;
+
+ if (have_final) {
+ if (!(ipprot->flags & INET6_PROTO_FINAL)) {
+ /* Once we've seen a final protocol don't
+ * allow encapsulation on any non-final
+ * ones. This allows foo in UDP encapsulation
+ * to work.
+ */
+ goto discard;
+ }
+ } else if (ipprot->flags & INET6_PROTO_FINAL) {
+ const struct ipv6hdr *hdr;
+
+ /* Only do this once for first final protocol */
+ have_final = true;
+
+ /* Free reference early: we don't need it any more,
+ and it may hold ip_conntrack module loaded
+ indefinitely. */
+ nf_reset(skb);
+
+ skb_postpull_rcsum(skb, skb_network_header(skb),
+ skb_network_header_len(skb));
+ hdr = ipv6_hdr(skb);
+ if (ipv6_addr_is_multicast(&hdr->daddr) &&
+ !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
+ &hdr->saddr) &&
+ !ipv6_is_mld(skb, nexthdr, skb_network_header_len(skb)))
+ goto discard;
+ }
+ if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
+ !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
+ goto discard;
+
+ ret = ipprot->handler(skb);
+ if (ret > 0) {
+ if (ipprot->flags & INET6_PROTO_FINAL) {
+ /* Not an extension header, most likely UDP
+ * encapsulation. Use return value as nexthdr
+ * protocol not nhoff (which presumably is
+ * not set by handler).
+ */
+ nexthdr = ret;
+ goto resubmit_final;
+ } else {
+ goto resubmit;
+ }
+ } else if (ret == 0) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDELIVERS);
+ }
+ } else {
+ if (!raw) {
+ if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
+ __IP6_INC_STATS(net, idev,
+ IPSTATS_MIB_INUNKNOWNPROTOS);
+ icmpv6_send(skb, ICMPV6_PARAMPROB,
+ ICMPV6_UNK_NEXTHDR, nhoff);
+ }
+ kfree_skb(skb);
+ } else {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDELIVERS);
+ consume_skb(skb);
+ }
+ }
+ rcu_read_unlock();
+ return 0;
+
+discard:
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
+ rcu_read_unlock();
+ kfree_skb(skb);
+ return 0;
+}
+
+
+int ip6_input(struct sk_buff *skb)
+{
+ return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN,
+ dev_net(skb->dev), NULL, skb, skb->dev, NULL,
+ ip6_input_finish);
+}
+EXPORT_SYMBOL_GPL(ip6_input);
+
+int ip6_mc_input(struct sk_buff *skb)
+{
+ const struct ipv6hdr *hdr;
+ bool deliver;
+
+ __IP6_UPD_PO_STATS(dev_net(skb_dst(skb)->dev),
+ __in6_dev_get_safely(skb->dev), IPSTATS_MIB_INMCAST,
+ skb->len);
+
+ hdr = ipv6_hdr(skb);
+ deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
+
+#ifdef CONFIG_IPV6_MROUTE
+ /*
+ * IPv6 multicast router mode is now supported ;)
+ */
+ if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding &&
+ !(ipv6_addr_type(&hdr->daddr) &
+ (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)) &&
+ likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
+ /*
+ * Okay, we try to forward - split and duplicate
+ * packets.
+ */
+ struct sk_buff *skb2;
+ struct inet6_skb_parm *opt = IP6CB(skb);
+
+ /* Check for MLD */
+ if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
+ /* Check if this is a mld message */
+ u8 nexthdr = hdr->nexthdr;
+ __be16 frag_off;
+ int offset;
+
+ /* Check if the value of Router Alert
+ * is for MLD (0x0000).
+ */
+ if (opt->ra == htons(IPV6_OPT_ROUTERALERT_MLD)) {
+ deliver = false;
+
+ if (!ipv6_ext_hdr(nexthdr)) {
+ /* BUG */
+ goto out;
+ }
+ offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
+ &nexthdr, &frag_off);
+ if (offset < 0)
+ goto out;
+
+ if (ipv6_is_mld(skb, nexthdr, offset))
+ deliver = true;
+
+ goto out;
+ }
+ /* unknown RA - process it normally */
+ }
+
+ if (deliver)
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ else {
+ skb2 = skb;
+ skb = NULL;
+ }
+
+ if (skb2) {
+ ip6_mr_input(skb2);
+ }
+ }
+out:
+#endif
+ if (likely(deliver))
+ ip6_input(skb);
+ else {
+ /* discard */
+ kfree_skb(skb);
+ }
+
+ return 0;
+}
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
new file mode 100644
index 0000000..c7e495f
--- /dev/null
+++ b/net/ipv6/ip6_offload.c
@@ -0,0 +1,394 @@
+/*
+ * IPV6 GSO/GRO offload support
+ * Linux INET6 implementation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/socket.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/printk.h>
+
+#include <net/protocol.h>
+#include <net/ipv6.h>
+#include <net/inet_common.h>
+
+#include "ip6_offload.h"
+
+static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
+{
+ const struct net_offload *ops = NULL;
+
+ for (;;) {
+ struct ipv6_opt_hdr *opth;
+ int len;
+
+ if (proto != NEXTHDR_HOP) {
+ ops = rcu_dereference(inet6_offloads[proto]);
+
+ if (unlikely(!ops))
+ break;
+
+ if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
+ break;
+ }
+
+ if (unlikely(!pskb_may_pull(skb, 8)))
+ break;
+
+ opth = (void *)skb->data;
+ len = ipv6_optlen(opth);
+
+ if (unlikely(!pskb_may_pull(skb, len)))
+ break;
+
+ opth = (void *)skb->data;
+ proto = opth->nexthdr;
+ __skb_pull(skb, len);
+ }
+
+ return proto;
+}
+
+static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
+ netdev_features_t features)
+{
+ struct sk_buff *segs = ERR_PTR(-EINVAL);
+ struct ipv6hdr *ipv6h;
+ const struct net_offload *ops;
+ int proto;
+ struct frag_hdr *fptr;
+ unsigned int payload_len;
+ u8 *prevhdr;
+ int offset = 0;
+ bool encap, udpfrag;
+ int nhoff;
+ bool gso_partial;
+
+ skb_reset_network_header(skb);
+ nhoff = skb_network_header(skb) - skb_mac_header(skb);
+ if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
+ goto out;
+
+ encap = SKB_GSO_CB(skb)->encap_level > 0;
+ if (encap)
+ features &= skb->dev->hw_enc_features;
+ SKB_GSO_CB(skb)->encap_level += sizeof(*ipv6h);
+
+ ipv6h = ipv6_hdr(skb);
+ __skb_pull(skb, sizeof(*ipv6h));
+ segs = ERR_PTR(-EPROTONOSUPPORT);
+
+ proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
+
+ if (skb->encapsulation &&
+ skb_shinfo(skb)->gso_type & (SKB_GSO_IPXIP4 | SKB_GSO_IPXIP6))
+ udpfrag = proto == IPPROTO_UDP && encap &&
+ (skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
+ else
+ udpfrag = proto == IPPROTO_UDP && !skb->encapsulation &&
+ (skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
+
+ ops = rcu_dereference(inet6_offloads[proto]);
+ if (likely(ops && ops->callbacks.gso_segment)) {
+ skb_reset_transport_header(skb);
+ segs = ops->callbacks.gso_segment(skb, features);
+ }
+
+ if (IS_ERR_OR_NULL(segs))
+ goto out;
+
+ gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
+
+ for (skb = segs; skb; skb = skb->next) {
+ ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff);
+ if (gso_partial && skb_is_gso(skb))
+ payload_len = skb_shinfo(skb)->gso_size +
+ SKB_GSO_CB(skb)->data_offset +
+ skb->head - (unsigned char *)(ipv6h + 1);
+ else
+ payload_len = skb->len - nhoff - sizeof(*ipv6h);
+ ipv6h->payload_len = htons(payload_len);
+ skb->network_header = (u8 *)ipv6h - skb->head;
+ skb_reset_mac_len(skb);
+
+ if (udpfrag) {
+ int err = ip6_find_1stfragopt(skb, &prevhdr);
+ if (err < 0) {
+ kfree_skb_list(segs);
+ return ERR_PTR(err);
+ }
+ fptr = (struct frag_hdr *)((u8 *)ipv6h + err);
+ fptr->frag_off = htons(offset);
+ if (skb->next)
+ fptr->frag_off |= htons(IP6_MF);
+ offset += (ntohs(ipv6h->payload_len) -
+ sizeof(struct frag_hdr));
+ }
+ if (encap)
+ skb_reset_inner_headers(skb);
+ }
+
+out:
+ return segs;
+}
+
+/* Return the total length of all the extension hdrs, following the same
+ * logic in ipv6_gso_pull_exthdrs() when parsing ext-hdrs.
+ */
+static int ipv6_exthdrs_len(struct ipv6hdr *iph,
+ const struct net_offload **opps)
+{
+ struct ipv6_opt_hdr *opth = (void *)iph;
+ int len = 0, proto, optlen = sizeof(*iph);
+
+ proto = iph->nexthdr;
+ for (;;) {
+ if (proto != NEXTHDR_HOP) {
+ *opps = rcu_dereference(inet6_offloads[proto]);
+ if (unlikely(!(*opps)))
+ break;
+ if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
+ break;
+ }
+ opth = (void *)opth + optlen;
+ optlen = ipv6_optlen(opth);
+ len += optlen;
+ proto = opth->nexthdr;
+ }
+ return len;
+}
+
+static struct sk_buff *ipv6_gro_receive(struct list_head *head,
+ struct sk_buff *skb)
+{
+ const struct net_offload *ops;
+ struct sk_buff *pp = NULL;
+ struct sk_buff *p;
+ struct ipv6hdr *iph;
+ unsigned int nlen;
+ unsigned int hlen;
+ unsigned int off;
+ u16 flush = 1;
+ int proto;
+
+ off = skb_gro_offset(skb);
+ hlen = off + sizeof(*iph);
+ iph = skb_gro_header_fast(skb, off);
+ if (skb_gro_header_hard(skb, hlen)) {
+ iph = skb_gro_header_slow(skb, hlen, off);
+ if (unlikely(!iph))
+ goto out;
+ }
+
+ skb_set_network_header(skb, off);
+ skb_gro_pull(skb, sizeof(*iph));
+ skb_set_transport_header(skb, skb_gro_offset(skb));
+
+ flush += ntohs(iph->payload_len) != skb_gro_len(skb);
+
+ rcu_read_lock();
+ proto = iph->nexthdr;
+ ops = rcu_dereference(inet6_offloads[proto]);
+ if (!ops || !ops->callbacks.gro_receive) {
+ __pskb_pull(skb, skb_gro_offset(skb));
+ skb_gro_frag0_invalidate(skb);
+ proto = ipv6_gso_pull_exthdrs(skb, proto);
+ skb_gro_pull(skb, -skb_transport_offset(skb));
+ skb_reset_transport_header(skb);
+ __skb_push(skb, skb_gro_offset(skb));
+
+ ops = rcu_dereference(inet6_offloads[proto]);
+ if (!ops || !ops->callbacks.gro_receive)
+ goto out_unlock;
+
+ iph = ipv6_hdr(skb);
+ }
+
+ NAPI_GRO_CB(skb)->proto = proto;
+
+ flush--;
+ nlen = skb_network_header_len(skb);
+
+ list_for_each_entry(p, head, list) {
+ const struct ipv6hdr *iph2;
+ __be32 first_word; /* <Version:4><Traffic_Class:8><Flow_Label:20> */
+
+ if (!NAPI_GRO_CB(p)->same_flow)
+ continue;
+
+ iph2 = (struct ipv6hdr *)(p->data + off);
+ first_word = *(__be32 *)iph ^ *(__be32 *)iph2;
+
+ /* All fields must match except length and Traffic Class.
+ * XXX skbs on the gro_list have all been parsed and pulled
+ * already so we don't need to compare nlen
+ * (nlen != (sizeof(*iph2) + ipv6_exthdrs_len(iph2, &ops)))
+ * memcmp() alone below is suffcient, right?
+ */
+ if ((first_word & htonl(0xF00FFFFF)) ||
+ memcmp(&iph->nexthdr, &iph2->nexthdr,
+ nlen - offsetof(struct ipv6hdr, nexthdr))) {
+ NAPI_GRO_CB(p)->same_flow = 0;
+ continue;
+ }
+ /* flush if Traffic Class fields are different */
+ NAPI_GRO_CB(p)->flush |= !!(first_word & htonl(0x0FF00000));
+ NAPI_GRO_CB(p)->flush |= flush;
+
+ /* If the previous IP ID value was based on an atomic
+ * datagram we can overwrite the value and ignore it.
+ */
+ if (NAPI_GRO_CB(skb)->is_atomic)
+ NAPI_GRO_CB(p)->flush_id = 0;
+ }
+
+ NAPI_GRO_CB(skb)->is_atomic = true;
+ NAPI_GRO_CB(skb)->flush |= flush;
+
+ skb_gro_postpull_rcsum(skb, iph, nlen);
+
+ pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
+
+out_unlock:
+ rcu_read_unlock();
+
+out:
+ skb_gro_flush_final(skb, pp, flush);
+
+ return pp;
+}
+
+static struct sk_buff *sit_ip6ip6_gro_receive(struct list_head *head,
+ struct sk_buff *skb)
+{
+ /* Common GRO receive for SIT and IP6IP6 */
+
+ if (NAPI_GRO_CB(skb)->encap_mark) {
+ NAPI_GRO_CB(skb)->flush = 1;
+ return NULL;
+ }
+
+ NAPI_GRO_CB(skb)->encap_mark = 1;
+
+ return ipv6_gro_receive(head, skb);
+}
+
+static struct sk_buff *ip4ip6_gro_receive(struct list_head *head,
+ struct sk_buff *skb)
+{
+ /* Common GRO receive for SIT and IP6IP6 */
+
+ if (NAPI_GRO_CB(skb)->encap_mark) {
+ NAPI_GRO_CB(skb)->flush = 1;
+ return NULL;
+ }
+
+ NAPI_GRO_CB(skb)->encap_mark = 1;
+
+ return inet_gro_receive(head, skb);
+}
+
+static int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
+{
+ const struct net_offload *ops;
+ struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + nhoff);
+ int err = -ENOSYS;
+
+ if (skb->encapsulation) {
+ skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IPV6));
+ skb_set_inner_network_header(skb, nhoff);
+ }
+
+ iph->payload_len = htons(skb->len - nhoff - sizeof(*iph));
+
+ rcu_read_lock();
+
+ nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
+ if (WARN_ON(!ops || !ops->callbacks.gro_complete))
+ goto out_unlock;
+
+ err = ops->callbacks.gro_complete(skb, nhoff);
+
+out_unlock:
+ rcu_read_unlock();
+
+ return err;
+}
+
+static int sit_gro_complete(struct sk_buff *skb, int nhoff)
+{
+ skb->encapsulation = 1;
+ skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
+ return ipv6_gro_complete(skb, nhoff);
+}
+
+static int ip6ip6_gro_complete(struct sk_buff *skb, int nhoff)
+{
+ skb->encapsulation = 1;
+ skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6;
+ return ipv6_gro_complete(skb, nhoff);
+}
+
+static int ip4ip6_gro_complete(struct sk_buff *skb, int nhoff)
+{
+ skb->encapsulation = 1;
+ skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6;
+ return inet_gro_complete(skb, nhoff);
+}
+
+static struct packet_offload ipv6_packet_offload __read_mostly = {
+ .type = cpu_to_be16(ETH_P_IPV6),
+ .callbacks = {
+ .gso_segment = ipv6_gso_segment,
+ .gro_receive = ipv6_gro_receive,
+ .gro_complete = ipv6_gro_complete,
+ },
+};
+
+static const struct net_offload sit_offload = {
+ .callbacks = {
+ .gso_segment = ipv6_gso_segment,
+ .gro_receive = sit_ip6ip6_gro_receive,
+ .gro_complete = sit_gro_complete,
+ },
+};
+
+static const struct net_offload ip4ip6_offload = {
+ .callbacks = {
+ .gso_segment = inet_gso_segment,
+ .gro_receive = ip4ip6_gro_receive,
+ .gro_complete = ip4ip6_gro_complete,
+ },
+};
+
+static const struct net_offload ip6ip6_offload = {
+ .callbacks = {
+ .gso_segment = ipv6_gso_segment,
+ .gro_receive = sit_ip6ip6_gro_receive,
+ .gro_complete = ip6ip6_gro_complete,
+ },
+};
+static int __init ipv6_offload_init(void)
+{
+
+ if (tcpv6_offload_init() < 0)
+ pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
+ if (ipv6_exthdrs_offload_init() < 0)
+ pr_crit("%s: Cannot add EXTHDRS protocol offload\n", __func__);
+
+ dev_add_offload(&ipv6_packet_offload);
+
+ inet_add_offload(&sit_offload, IPPROTO_IPV6);
+ inet6_add_offload(&ip6ip6_offload, IPPROTO_IPV6);
+ inet6_add_offload(&ip4ip6_offload, IPPROTO_IPIP);
+
+ return 0;
+}
+
+fs_initcall(ipv6_offload_init);
diff --git a/net/ipv6/ip6_offload.h b/net/ipv6/ip6_offload.h
new file mode 100644
index 0000000..96b40e4
--- /dev/null
+++ b/net/ipv6/ip6_offload.h
@@ -0,0 +1,19 @@
+/*
+ * IPV6 GSO/GRO offload support
+ * Linux INET6 implementation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef __ip6_offload_h
+#define __ip6_offload_h
+
+int ipv6_exthdrs_offload_init(void);
+int udpv6_offload_init(void);
+int udpv6_offload_exit(void);
+int tcpv6_offload_init(void);
+
+#endif
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
new file mode 100644
index 0000000..2694def
--- /dev/null
+++ b/net/ipv6/ip6_output.c
@@ -0,0 +1,1784 @@
+/*
+ * IPv6 output functions
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Based on linux/net/ipv4/ip_output.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Changes:
+ * A.N.Kuznetsov : airthmetics in fragmentation.
+ * extension headers are implemented.
+ * route changes now work.
+ * ip6_forward does not confuse sniffers.
+ * etc.
+ *
+ * H. von Brand : Added missing #include <linux/string.h>
+ * Imran Patel : frag id should be in NBO
+ * Kazunori MIYAZAWA @USAGI
+ * : add ip6_append_data and related functions
+ * for datagram xmit
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/in6.h>
+#include <linux/tcp.h>
+#include <linux/route.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <linux/bpf-cgroup.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/protocol.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/rawv6.h>
+#include <net/icmp.h>
+#include <net/xfrm.h>
+#include <net/checksum.h>
+#include <linux/mroute6.h>
+#include <net/l3mdev.h>
+#include <net/lwtunnel.h>
+
+static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb_dst(skb);
+ struct net_device *dev = dst->dev;
+ struct neighbour *neigh;
+ struct in6_addr *nexthop;
+ int ret;
+
+ if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
+ struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
+
+ if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) &&
+ ((mroute6_is_socket(net, skb) &&
+ !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
+ ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
+ &ipv6_hdr(skb)->saddr))) {
+ struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
+
+ /* Do not check for IFF_ALLMULTI; multicast routing
+ is not supported in any case.
+ */
+ if (newskb)
+ NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING,
+ net, sk, newskb, NULL, newskb->dev,
+ dev_loopback_xmit);
+
+ if (ipv6_hdr(skb)->hop_limit == 0) {
+ IP6_INC_STATS(net, idev,
+ IPSTATS_MIB_OUTDISCARDS);
+ kfree_skb(skb);
+ return 0;
+ }
+ }
+
+ IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len);
+
+ if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <=
+ IPV6_ADDR_SCOPE_NODELOCAL &&
+ !(dev->flags & IFF_LOOPBACK)) {
+ kfree_skb(skb);
+ return 0;
+ }
+ }
+
+ if (lwtunnel_xmit_redirect(dst->lwtstate)) {
+ int res = lwtunnel_xmit(skb);
+
+ if (res < 0 || res == LWTUNNEL_XMIT_DONE)
+ return res;
+ }
+
+ rcu_read_lock_bh();
+ nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
+ neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
+ if (unlikely(!neigh))
+ neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
+ if (!IS_ERR(neigh)) {
+ sock_confirm_neigh(skb, neigh);
+ ret = neigh_output(neigh, skb);
+ rcu_read_unlock_bh();
+ return ret;
+ }
+ rcu_read_unlock_bh();
+
+ IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ int ret;
+
+ ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb);
+ if (ret) {
+ kfree_skb(skb);
+ return ret;
+ }
+
+#if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM)
+ /* Policy lookup after SNAT yielded a new policy */
+ if (skb_dst(skb)->xfrm) {
+ IPCB(skb)->flags |= IPSKB_REROUTED;
+ return dst_output(net, sk, skb);
+ }
+#endif
+
+ if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
+ dst_allfrag(skb_dst(skb)) ||
+ (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size))
+ return ip6_fragment(net, sk, skb, ip6_finish_output2);
+ else
+ return ip6_finish_output2(net, sk, skb);
+}
+
+int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ struct net_device *dev = skb_dst(skb)->dev;
+ struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
+
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->dev = dev;
+
+ if (unlikely(idev->cnf.disable_ipv6)) {
+ IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
+ kfree_skb(skb);
+ return 0;
+ }
+
+ return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
+ net, sk, skb, NULL, dev,
+ ip6_finish_output,
+ !(IP6CB(skb)->flags & IP6SKB_REROUTED));
+}
+
+bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np)
+{
+ if (!np->autoflowlabel_set)
+ return ip6_default_np_autolabel(net);
+ else
+ return np->autoflowlabel;
+}
+
+/*
+ * xmit an sk_buff (used by TCP, SCTP and DCCP)
+ * Note : socket lock is not held for SYNACK packets, but might be modified
+ * by calls to skb_set_owner_w() and ipv6_local_error(),
+ * which are using proper atomic operations or spinlocks.
+ */
+int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
+ __u32 mark, struct ipv6_txoptions *opt, int tclass)
+{
+ struct net *net = sock_net(sk);
+ const struct ipv6_pinfo *np = inet6_sk(sk);
+ struct in6_addr *first_hop = &fl6->daddr;
+ struct dst_entry *dst = skb_dst(skb);
+ unsigned int head_room;
+ struct ipv6hdr *hdr;
+ u8 proto = fl6->flowi6_proto;
+ int seg_len = skb->len;
+ int hlimit = -1;
+ u32 mtu;
+
+ head_room = sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev);
+ if (opt)
+ head_room += opt->opt_nflen + opt->opt_flen;
+
+ if (unlikely(skb_headroom(skb) < head_room)) {
+ struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room);
+ if (!skb2) {
+ IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_OUTDISCARDS);
+ kfree_skb(skb);
+ return -ENOBUFS;
+ }
+ if (skb->sk)
+ skb_set_owner_w(skb2, skb->sk);
+ consume_skb(skb);
+ skb = skb2;
+ }
+
+ if (opt) {
+ seg_len += opt->opt_nflen + opt->opt_flen;
+
+ if (opt->opt_flen)
+ ipv6_push_frag_opts(skb, opt, &proto);
+
+ if (opt->opt_nflen)
+ ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop,
+ &fl6->saddr);
+ }
+
+ skb_push(skb, sizeof(struct ipv6hdr));
+ skb_reset_network_header(skb);
+ hdr = ipv6_hdr(skb);
+
+ /*
+ * Fill in the IPv6 header
+ */
+ if (np)
+ hlimit = np->hop_limit;
+ if (hlimit < 0)
+ hlimit = ip6_dst_hoplimit(dst);
+
+ ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel,
+ ip6_autoflowlabel(net, np), fl6));
+
+ hdr->payload_len = htons(seg_len);
+ hdr->nexthdr = proto;
+ hdr->hop_limit = hlimit;
+
+ hdr->saddr = fl6->saddr;
+ hdr->daddr = *first_hop;
+
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->priority = sk->sk_priority;
+ skb->mark = mark;
+
+ mtu = dst_mtu(dst);
+ if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {
+ IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_OUT, skb->len);
+
+ /* if egress device is enslaved to an L3 master device pass the
+ * skb to its handler for processing
+ */
+ skb = l3mdev_ip6_out((struct sock *)sk, skb);
+ if (unlikely(!skb))
+ return 0;
+
+ /* hooks should never assume socket lock is held.
+ * we promote our socket to non const
+ */
+ return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
+ net, (struct sock *)sk, skb, NULL, dst->dev,
+ dst_output);
+ }
+
+ skb->dev = dst->dev;
+ /* ipv6_local_error() does not require socket lock,
+ * we promote our socket to non const
+ */
+ ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu);
+
+ IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS);
+ kfree_skb(skb);
+ return -EMSGSIZE;
+}
+EXPORT_SYMBOL(ip6_xmit);
+
+static int ip6_call_ra_chain(struct sk_buff *skb, int sel)
+{
+ struct ip6_ra_chain *ra;
+ struct sock *last = NULL;
+
+ read_lock(&ip6_ra_lock);
+ for (ra = ip6_ra_chain; ra; ra = ra->next) {
+ struct sock *sk = ra->sk;
+ if (sk && ra->sel == sel &&
+ (!sk->sk_bound_dev_if ||
+ sk->sk_bound_dev_if == skb->dev->ifindex)) {
+ if (last) {
+ struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (skb2)
+ rawv6_rcv(last, skb2);
+ }
+ last = sk;
+ }
+ }
+
+ if (last) {
+ rawv6_rcv(last, skb);
+ read_unlock(&ip6_ra_lock);
+ return 1;
+ }
+ read_unlock(&ip6_ra_lock);
+ return 0;
+}
+
+static int ip6_forward_proxy_check(struct sk_buff *skb)
+{
+ struct ipv6hdr *hdr = ipv6_hdr(skb);
+ u8 nexthdr = hdr->nexthdr;
+ __be16 frag_off;
+ int offset;
+
+ if (ipv6_ext_hdr(nexthdr)) {
+ offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off);
+ if (offset < 0)
+ return 0;
+ } else
+ offset = sizeof(struct ipv6hdr);
+
+ if (nexthdr == IPPROTO_ICMPV6) {
+ struct icmp6hdr *icmp6;
+
+ if (!pskb_may_pull(skb, (skb_network_header(skb) +
+ offset + 1 - skb->data)))
+ return 0;
+
+ icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
+
+ switch (icmp6->icmp6_type) {
+ case NDISC_ROUTER_SOLICITATION:
+ case NDISC_ROUTER_ADVERTISEMENT:
+ case NDISC_NEIGHBOUR_SOLICITATION:
+ case NDISC_NEIGHBOUR_ADVERTISEMENT:
+ case NDISC_REDIRECT:
+ /* For reaction involving unicast neighbor discovery
+ * message destined to the proxied address, pass it to
+ * input function.
+ */
+ return 1;
+ default:
+ break;
+ }
+ }
+
+ /*
+ * The proxying router can't forward traffic sent to a link-local
+ * address, so signal the sender and discard the packet. This
+ * behavior is clarified by the MIPv6 specification.
+ */
+ if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) {
+ dst_link_failure(skb);
+ return -1;
+ }
+
+ return 0;
+}
+
+static inline int ip6_forward_finish(struct net *net, struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb_dst(skb);
+
+ __IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
+ __IP6_ADD_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len);
+
+ return dst_output(net, sk, skb);
+}
+
+static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
+{
+ if (skb->len <= mtu)
+ return false;
+
+ /* ipv6 conntrack defrag sets max_frag_size + ignore_df */
+ if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)
+ return true;
+
+ if (skb->ignore_df)
+ return false;
+
+ if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
+ return false;
+
+ return true;
+}
+
+int ip6_forward(struct sk_buff *skb)
+{
+ struct inet6_dev *idev = __in6_dev_get_safely(skb->dev);
+ struct dst_entry *dst = skb_dst(skb);
+ struct ipv6hdr *hdr = ipv6_hdr(skb);
+ struct inet6_skb_parm *opt = IP6CB(skb);
+ struct net *net = dev_net(dst->dev);
+ u32 mtu;
+
+ if (net->ipv6.devconf_all->forwarding == 0)
+ goto error;
+
+ if (skb->pkt_type != PACKET_HOST)
+ goto drop;
+
+ if (unlikely(skb->sk))
+ goto drop;
+
+ if (skb_warn_if_lro(skb))
+ goto drop;
+
+ if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
+ goto drop;
+ }
+
+ skb_forward_csum(skb);
+
+ /*
+ * We DO NOT make any processing on
+ * RA packets, pushing them to user level AS IS
+ * without ane WARRANTY that application will be able
+ * to interpret them. The reason is that we
+ * cannot make anything clever here.
+ *
+ * We are not end-node, so that if packet contains
+ * AH/ESP, we cannot make anything.
+ * Defragmentation also would be mistake, RA packets
+ * cannot be fragmented, because there is no warranty
+ * that different fragments will go along one path. --ANK
+ */
+ if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
+ if (ip6_call_ra_chain(skb, ntohs(opt->ra)))
+ return 0;
+ }
+
+ /*
+ * check and decrement ttl
+ */
+ if (hdr->hop_limit <= 1) {
+ /* Force OUTPUT device used as source address */
+ skb->dev = dst->dev;
+ icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0);
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+
+ kfree_skb(skb);
+ return -ETIMEDOUT;
+ }
+
+ /* XXX: idev->cnf.proxy_ndp? */
+ if (net->ipv6.devconf_all->proxy_ndp &&
+ pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) {
+ int proxied = ip6_forward_proxy_check(skb);
+ if (proxied > 0)
+ return ip6_input(skb);
+ else if (proxied < 0) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
+ goto drop;
+ }
+ }
+
+ if (!xfrm6_route_forward(skb)) {
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
+ goto drop;
+ }
+ dst = skb_dst(skb);
+
+ /* IPv6 specs say nothing about it, but it is clear that we cannot
+ send redirects to source routed frames.
+ We don't send redirects to frames decapsulated from IPsec.
+ */
+ if (IP6CB(skb)->iif == dst->dev->ifindex &&
+ opt->srcrt == 0 && !skb_sec_path(skb)) {
+ struct in6_addr *target = NULL;
+ struct inet_peer *peer;
+ struct rt6_info *rt;
+
+ /*
+ * incoming and outgoing devices are the same
+ * send a redirect.
+ */
+
+ rt = (struct rt6_info *) dst;
+ if (rt->rt6i_flags & RTF_GATEWAY)
+ target = &rt->rt6i_gateway;
+ else
+ target = &hdr->daddr;
+
+ peer = inet_getpeer_v6(net->ipv6.peers, &hdr->daddr, 1);
+
+ /* Limit redirects both by destination (here)
+ and by source (inside ndisc_send_redirect)
+ */
+ if (inet_peer_xrlim_allow(peer, 1*HZ))
+ ndisc_send_redirect(skb, target);
+ if (peer)
+ inet_putpeer(peer);
+ } else {
+ int addrtype = ipv6_addr_type(&hdr->saddr);
+
+ /* This check is security critical. */
+ if (addrtype == IPV6_ADDR_ANY ||
+ addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK))
+ goto error;
+ if (addrtype & IPV6_ADDR_LINKLOCAL) {
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH,
+ ICMPV6_NOT_NEIGHBOUR, 0);
+ goto error;
+ }
+ }
+
+ mtu = ip6_dst_mtu_forward(dst);
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
+
+ if (ip6_pkt_too_big(skb, mtu)) {
+ /* Again, force OUTPUT device used as source address */
+ skb->dev = dst->dev;
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INTOOBIGERRORS);
+ __IP6_INC_STATS(net, ip6_dst_idev(dst),
+ IPSTATS_MIB_FRAGFAILS);
+ kfree_skb(skb);
+ return -EMSGSIZE;
+ }
+
+ if (skb_cow(skb, dst->dev->hard_header_len)) {
+ __IP6_INC_STATS(net, ip6_dst_idev(dst),
+ IPSTATS_MIB_OUTDISCARDS);
+ goto drop;
+ }
+
+ hdr = ipv6_hdr(skb);
+
+ /* Mangling hops number delayed to point after skb COW */
+
+ hdr->hop_limit--;
+
+ return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
+ net, NULL, skb, skb->dev, dst->dev,
+ ip6_forward_finish);
+
+error:
+ __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from)
+{
+ to->pkt_type = from->pkt_type;
+ to->priority = from->priority;
+ to->protocol = from->protocol;
+ skb_dst_drop(to);
+ skb_dst_set(to, dst_clone(skb_dst(from)));
+ to->dev = from->dev;
+ to->mark = from->mark;
+
+ skb_copy_hash(to, from);
+
+#ifdef CONFIG_NET_SCHED
+ to->tc_index = from->tc_index;
+#endif
+ nf_copy(to, from);
+ skb_copy_secmark(to, from);
+}
+
+int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
+ int (*output)(struct net *, struct sock *, struct sk_buff *))
+{
+ struct sk_buff *frag;
+ struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
+ struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
+ inet6_sk(skb->sk) : NULL;
+ struct ipv6hdr *tmp_hdr;
+ struct frag_hdr *fh;
+ unsigned int mtu, hlen, left, len;
+ int hroom, troom;
+ __be32 frag_id;
+ int ptr, offset = 0, err = 0;
+ u8 *prevhdr, nexthdr = 0;
+
+ err = ip6_find_1stfragopt(skb, &prevhdr);
+ if (err < 0)
+ goto fail;
+ hlen = err;
+ nexthdr = *prevhdr;
+
+ mtu = ip6_skb_dst_mtu(skb);
+
+ /* We must not fragment if the socket is set to force MTU discovery
+ * or if the skb it not generated by a local socket.
+ */
+ if (unlikely(!skb->ignore_df && skb->len > mtu))
+ goto fail_toobig;
+
+ if (IP6CB(skb)->frag_max_size) {
+ if (IP6CB(skb)->frag_max_size > mtu)
+ goto fail_toobig;
+
+ /* don't send fragments larger than what we received */
+ mtu = IP6CB(skb)->frag_max_size;
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
+ }
+
+ if (np && np->frag_size < mtu) {
+ if (np->frag_size)
+ mtu = np->frag_size;
+ }
+ if (mtu < hlen + sizeof(struct frag_hdr) + 8)
+ goto fail_toobig;
+ mtu -= hlen + sizeof(struct frag_hdr);
+
+ frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr,
+ &ipv6_hdr(skb)->saddr);
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL &&
+ (err = skb_checksum_help(skb)))
+ goto fail;
+
+ hroom = LL_RESERVED_SPACE(rt->dst.dev);
+ if (skb_has_frag_list(skb)) {
+ unsigned int first_len = skb_pagelen(skb);
+ struct sk_buff *frag2;
+
+ if (first_len - hlen > mtu ||
+ ((first_len - hlen) & 7) ||
+ skb_cloned(skb) ||
+ skb_headroom(skb) < (hroom + sizeof(struct frag_hdr)))
+ goto slow_path;
+
+ skb_walk_frags(skb, frag) {
+ /* Correct geometry. */
+ if (frag->len > mtu ||
+ ((frag->len & 7) && frag->next) ||
+ skb_headroom(frag) < (hlen + hroom + sizeof(struct frag_hdr)))
+ goto slow_path_clean;
+
+ /* Partially cloned skb? */
+ if (skb_shared(frag))
+ goto slow_path_clean;
+
+ BUG_ON(frag->sk);
+ if (skb->sk) {
+ frag->sk = skb->sk;
+ frag->destructor = sock_wfree;
+ }
+ skb->truesize -= frag->truesize;
+ }
+
+ err = 0;
+ offset = 0;
+ /* BUILD HEADER */
+
+ *prevhdr = NEXTHDR_FRAGMENT;
+ tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
+ if (!tmp_hdr) {
+ err = -ENOMEM;
+ goto fail;
+ }
+ frag = skb_shinfo(skb)->frag_list;
+ skb_frag_list_init(skb);
+
+ __skb_pull(skb, hlen);
+ fh = __skb_push(skb, sizeof(struct frag_hdr));
+ __skb_push(skb, hlen);
+ skb_reset_network_header(skb);
+ memcpy(skb_network_header(skb), tmp_hdr, hlen);
+
+ fh->nexthdr = nexthdr;
+ fh->reserved = 0;
+ fh->frag_off = htons(IP6_MF);
+ fh->identification = frag_id;
+
+ first_len = skb_pagelen(skb);
+ skb->data_len = first_len - skb_headlen(skb);
+ skb->len = first_len;
+ ipv6_hdr(skb)->payload_len = htons(first_len -
+ sizeof(struct ipv6hdr));
+
+ for (;;) {
+ /* Prepare header of the next frame,
+ * before previous one went down. */
+ if (frag) {
+ frag->ip_summed = CHECKSUM_NONE;
+ skb_reset_transport_header(frag);
+ fh = __skb_push(frag, sizeof(struct frag_hdr));
+ __skb_push(frag, hlen);
+ skb_reset_network_header(frag);
+ memcpy(skb_network_header(frag), tmp_hdr,
+ hlen);
+ offset += skb->len - hlen - sizeof(struct frag_hdr);
+ fh->nexthdr = nexthdr;
+ fh->reserved = 0;
+ fh->frag_off = htons(offset);
+ if (frag->next)
+ fh->frag_off |= htons(IP6_MF);
+ fh->identification = frag_id;
+ ipv6_hdr(frag)->payload_len =
+ htons(frag->len -
+ sizeof(struct ipv6hdr));
+ ip6_copy_metadata(frag, skb);
+ }
+
+ err = output(net, sk, skb);
+ if (!err)
+ IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
+ IPSTATS_MIB_FRAGCREATES);
+
+ if (err || !frag)
+ break;
+
+ skb = frag;
+ frag = skb->next;
+ skb->next = NULL;
+ }
+
+ kfree(tmp_hdr);
+
+ if (err == 0) {
+ IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
+ IPSTATS_MIB_FRAGOKS);
+ return 0;
+ }
+
+ kfree_skb_list(frag);
+
+ IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
+ IPSTATS_MIB_FRAGFAILS);
+ return err;
+
+slow_path_clean:
+ skb_walk_frags(skb, frag2) {
+ if (frag2 == frag)
+ break;
+ frag2->sk = NULL;
+ frag2->destructor = NULL;
+ skb->truesize += frag2->truesize;
+ }
+ }
+
+slow_path:
+ left = skb->len - hlen; /* Space per frame */
+ ptr = hlen; /* Where to start from */
+
+ /*
+ * Fragment the datagram.
+ */
+
+ troom = rt->dst.dev->needed_tailroom;
+
+ /*
+ * Keep copying data until we run out.
+ */
+ while (left > 0) {
+ u8 *fragnexthdr_offset;
+
+ len = left;
+ /* IF: it doesn't fit, use 'mtu' - the data space left */
+ if (len > mtu)
+ len = mtu;
+ /* IF: we are not sending up to and including the packet end
+ then align the next start on an eight byte boundary */
+ if (len < left) {
+ len &= ~7;
+ }
+
+ /* Allocate buffer */
+ frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) +
+ hroom + troom, GFP_ATOMIC);
+ if (!frag) {
+ err = -ENOMEM;
+ goto fail;
+ }
+
+ /*
+ * Set up data on packet
+ */
+
+ ip6_copy_metadata(frag, skb);
+ skb_reserve(frag, hroom);
+ skb_put(frag, len + hlen + sizeof(struct frag_hdr));
+ skb_reset_network_header(frag);
+ fh = (struct frag_hdr *)(skb_network_header(frag) + hlen);
+ frag->transport_header = (frag->network_header + hlen +
+ sizeof(struct frag_hdr));
+
+ /*
+ * Charge the memory for the fragment to any owner
+ * it might possess
+ */
+ if (skb->sk)
+ skb_set_owner_w(frag, skb->sk);
+
+ /*
+ * Copy the packet header into the new buffer.
+ */
+ skb_copy_from_linear_data(skb, skb_network_header(frag), hlen);
+
+ fragnexthdr_offset = skb_network_header(frag);
+ fragnexthdr_offset += prevhdr - skb_network_header(skb);
+ *fragnexthdr_offset = NEXTHDR_FRAGMENT;
+
+ /*
+ * Build fragment header.
+ */
+ fh->nexthdr = nexthdr;
+ fh->reserved = 0;
+ fh->identification = frag_id;
+
+ /*
+ * Copy a block of the IP datagram.
+ */
+ BUG_ON(skb_copy_bits(skb, ptr, skb_transport_header(frag),
+ len));
+ left -= len;
+
+ fh->frag_off = htons(offset);
+ if (left > 0)
+ fh->frag_off |= htons(IP6_MF);
+ ipv6_hdr(frag)->payload_len = htons(frag->len -
+ sizeof(struct ipv6hdr));
+
+ ptr += len;
+ offset += len;
+
+ /*
+ * Put this fragment into the sending queue.
+ */
+ err = output(net, sk, frag);
+ if (err)
+ goto fail;
+
+ IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_FRAGCREATES);
+ }
+ IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_FRAGOKS);
+ consume_skb(skb);
+ return err;
+
+fail_toobig:
+ if (skb->sk && dst_allfrag(skb_dst(skb)))
+ sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK);
+
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ err = -EMSGSIZE;
+
+fail:
+ IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_FRAGFAILS);
+ kfree_skb(skb);
+ return err;
+}
+
+static inline int ip6_rt_check(const struct rt6key *rt_key,
+ const struct in6_addr *fl_addr,
+ const struct in6_addr *addr_cache)
+{
+ return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) &&
+ (!addr_cache || !ipv6_addr_equal(fl_addr, addr_cache));
+}
+
+static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
+ struct dst_entry *dst,
+ const struct flowi6 *fl6)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct rt6_info *rt;
+
+ if (!dst)
+ goto out;
+
+ if (dst->ops->family != AF_INET6) {
+ dst_release(dst);
+ return NULL;
+ }
+
+ rt = (struct rt6_info *)dst;
+ /* Yes, checking route validity in not connected
+ * case is not very simple. Take into account,
+ * that we do not support routing by source, TOS,
+ * and MSG_DONTROUTE --ANK (980726)
+ *
+ * 1. ip6_rt_check(): If route was host route,
+ * check that cached destination is current.
+ * If it is network route, we still may
+ * check its validity using saved pointer
+ * to the last used address: daddr_cache.
+ * We do not want to save whole address now,
+ * (because main consumer of this service
+ * is tcp, which has not this problem),
+ * so that the last trick works only on connected
+ * sockets.
+ * 2. oif also should be the same.
+ */
+ if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) ||
+#ifdef CONFIG_IPV6_SUBTREES
+ ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) ||
+#endif
+ (!(fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) &&
+ (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex))) {
+ dst_release(dst);
+ dst = NULL;
+ }
+
+out:
+ return dst;
+}
+
+static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
+ struct dst_entry **dst, struct flowi6 *fl6)
+{
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ struct neighbour *n;
+ struct rt6_info *rt;
+#endif
+ int err;
+ int flags = 0;
+
+ /* The correct way to handle this would be to do
+ * ip6_route_get_saddr, and then ip6_route_output; however,
+ * the route-specific preferred source forces the
+ * ip6_route_output call _before_ ip6_route_get_saddr.
+ *
+ * In source specific routing (no src=any default route),
+ * ip6_route_output will fail given src=any saddr, though, so
+ * that's why we try it again later.
+ */
+ if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) {
+ struct fib6_info *from;
+ struct rt6_info *rt;
+ bool had_dst = *dst != NULL;
+
+ if (!had_dst)
+ *dst = ip6_route_output(net, sk, fl6);
+ rt = (*dst)->error ? NULL : (struct rt6_info *)*dst;
+
+ rcu_read_lock();
+ from = rt ? rcu_dereference(rt->from) : NULL;
+ err = ip6_route_get_saddr(net, from, &fl6->daddr,
+ sk ? inet6_sk(sk)->srcprefs : 0,
+ &fl6->saddr);
+ rcu_read_unlock();
+
+ if (err)
+ goto out_err_release;
+
+ /* If we had an erroneous initial result, pretend it
+ * never existed and let the SA-enabled version take
+ * over.
+ */
+ if (!had_dst && (*dst)->error) {
+ dst_release(*dst);
+ *dst = NULL;
+ }
+
+ if (fl6->flowi6_oif)
+ flags |= RT6_LOOKUP_F_IFACE;
+ }
+
+ if (!*dst)
+ *dst = ip6_route_output_flags(net, sk, fl6, flags);
+
+ err = (*dst)->error;
+ if (err)
+ goto out_err_release;
+
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ /*
+ * Here if the dst entry we've looked up
+ * has a neighbour entry that is in the INCOMPLETE
+ * state and the src address from the flow is
+ * marked as OPTIMISTIC, we release the found
+ * dst entry and replace it instead with the
+ * dst entry of the nexthop router
+ */
+ rt = (struct rt6_info *) *dst;
+ rcu_read_lock_bh();
+ n = __ipv6_neigh_lookup_noref(rt->dst.dev,
+ rt6_nexthop(rt, &fl6->daddr));
+ err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0;
+ rcu_read_unlock_bh();
+
+ if (err) {
+ struct inet6_ifaddr *ifp;
+ struct flowi6 fl_gw6;
+ int redirect;
+
+ ifp = ipv6_get_ifaddr(net, &fl6->saddr,
+ (*dst)->dev, 1);
+
+ redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
+ if (ifp)
+ in6_ifa_put(ifp);
+
+ if (redirect) {
+ /*
+ * We need to get the dst entry for the
+ * default router instead
+ */
+ dst_release(*dst);
+ memcpy(&fl_gw6, fl6, sizeof(struct flowi6));
+ memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr));
+ *dst = ip6_route_output(net, sk, &fl_gw6);
+ err = (*dst)->error;
+ if (err)
+ goto out_err_release;
+ }
+ }
+#endif
+ if (ipv6_addr_v4mapped(&fl6->saddr) &&
+ !(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr))) {
+ err = -EAFNOSUPPORT;
+ goto out_err_release;
+ }
+
+ return 0;
+
+out_err_release:
+ dst_release(*dst);
+ *dst = NULL;
+
+ if (err == -ENETUNREACH)
+ IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES);
+ return err;
+}
+
+/**
+ * ip6_dst_lookup - perform route lookup on flow
+ * @sk: socket which provides route info
+ * @dst: pointer to dst_entry * for result
+ * @fl6: flow to lookup
+ *
+ * This function performs a route lookup on the given flow.
+ *
+ * It returns zero on success, or a standard errno code on error.
+ */
+int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
+ struct flowi6 *fl6)
+{
+ *dst = NULL;
+ return ip6_dst_lookup_tail(net, sk, dst, fl6);
+}
+EXPORT_SYMBOL_GPL(ip6_dst_lookup);
+
+/**
+ * ip6_dst_lookup_flow - perform route lookup on flow with ipsec
+ * @sk: socket which provides route info
+ * @fl6: flow to lookup
+ * @final_dst: final destination address for ipsec lookup
+ *
+ * This function performs a route lookup on the given flow.
+ *
+ * It returns a valid dst pointer on success, or a pointer encoded
+ * error code.
+ */
+struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
+ const struct in6_addr *final_dst)
+{
+ struct dst_entry *dst = NULL;
+ int err;
+
+ err = ip6_dst_lookup_tail(sock_net(sk), sk, &dst, fl6);
+ if (err)
+ return ERR_PTR(err);
+ if (final_dst)
+ fl6->daddr = *final_dst;
+
+ return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
+}
+EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow);
+
+/**
+ * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow
+ * @sk: socket which provides the dst cache and route info
+ * @fl6: flow to lookup
+ * @final_dst: final destination address for ipsec lookup
+ * @connected: whether @sk is connected or not
+ *
+ * This function performs a route lookup on the given flow with the
+ * possibility of using the cached route in the socket if it is valid.
+ * It will take the socket dst lock when operating on the dst cache.
+ * As a result, this function can only be used in process context.
+ *
+ * In addition, for a connected socket, cache the dst in the socket
+ * if the current cache is not valid.
+ *
+ * It returns a valid dst pointer on success, or a pointer encoded
+ * error code.
+ */
+struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
+ const struct in6_addr *final_dst,
+ bool connected)
+{
+ struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
+
+ dst = ip6_sk_dst_check(sk, dst, fl6);
+ if (dst)
+ return dst;
+
+ dst = ip6_dst_lookup_flow(sk, fl6, final_dst);
+ if (connected && !IS_ERR(dst))
+ ip6_sk_dst_store_flow(sk, dst_clone(dst), fl6);
+
+ return dst;
+}
+EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
+
+static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src,
+ gfp_t gfp)
+{
+ return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
+}
+
+static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src,
+ gfp_t gfp)
+{
+ return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
+}
+
+static void ip6_append_data_mtu(unsigned int *mtu,
+ int *maxfraglen,
+ unsigned int fragheaderlen,
+ struct sk_buff *skb,
+ struct rt6_info *rt,
+ unsigned int orig_mtu)
+{
+ if (!(rt->dst.flags & DST_XFRM_TUNNEL)) {
+ if (!skb) {
+ /* first fragment, reserve header_len */
+ *mtu = orig_mtu - rt->dst.header_len;
+
+ } else {
+ /*
+ * this fragment is not first, the headers
+ * space is regarded as data space.
+ */
+ *mtu = orig_mtu;
+ }
+ *maxfraglen = ((*mtu - fragheaderlen) & ~7)
+ + fragheaderlen - sizeof(struct frag_hdr);
+ }
+}
+
+static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
+ struct inet6_cork *v6_cork, struct ipcm6_cookie *ipc6,
+ struct rt6_info *rt, struct flowi6 *fl6)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ unsigned int mtu;
+ struct ipv6_txoptions *opt = ipc6->opt;
+
+ /*
+ * setup for corking
+ */
+ if (opt) {
+ if (WARN_ON(v6_cork->opt))
+ return -EINVAL;
+
+ v6_cork->opt = kzalloc(sizeof(*opt), sk->sk_allocation);
+ if (unlikely(!v6_cork->opt))
+ return -ENOBUFS;
+
+ v6_cork->opt->tot_len = sizeof(*opt);
+ v6_cork->opt->opt_flen = opt->opt_flen;
+ v6_cork->opt->opt_nflen = opt->opt_nflen;
+
+ v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt,
+ sk->sk_allocation);
+ if (opt->dst0opt && !v6_cork->opt->dst0opt)
+ return -ENOBUFS;
+
+ v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt,
+ sk->sk_allocation);
+ if (opt->dst1opt && !v6_cork->opt->dst1opt)
+ return -ENOBUFS;
+
+ v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt,
+ sk->sk_allocation);
+ if (opt->hopopt && !v6_cork->opt->hopopt)
+ return -ENOBUFS;
+
+ v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt,
+ sk->sk_allocation);
+ if (opt->srcrt && !v6_cork->opt->srcrt)
+ return -ENOBUFS;
+
+ /* need source address above miyazawa*/
+ }
+ dst_hold(&rt->dst);
+ cork->base.dst = &rt->dst;
+ cork->fl.u.ip6 = *fl6;
+ v6_cork->hop_limit = ipc6->hlimit;
+ v6_cork->tclass = ipc6->tclass;
+ if (rt->dst.flags & DST_XFRM_TUNNEL)
+ mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
+ READ_ONCE(rt->dst.dev->mtu) : dst_mtu(&rt->dst);
+ else
+ mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
+ READ_ONCE(rt->dst.dev->mtu) : dst_mtu(xfrm_dst_path(&rt->dst));
+ if (np->frag_size < mtu) {
+ if (np->frag_size)
+ mtu = np->frag_size;
+ }
+ if (mtu < IPV6_MIN_MTU)
+ return -EINVAL;
+ cork->base.fragsize = mtu;
+ cork->base.gso_size = ipc6->gso_size;
+ cork->base.tx_flags = 0;
+ sock_tx_timestamp(sk, ipc6->sockc.tsflags, &cork->base.tx_flags);
+
+ if (dst_allfrag(xfrm_dst_path(&rt->dst)))
+ cork->base.flags |= IPCORK_ALLFRAG;
+ cork->base.length = 0;
+
+ cork->base.transmit_time = ipc6->sockc.transmit_time;
+
+ return 0;
+}
+
+static int __ip6_append_data(struct sock *sk,
+ struct flowi6 *fl6,
+ struct sk_buff_head *queue,
+ struct inet_cork *cork,
+ struct inet6_cork *v6_cork,
+ struct page_frag *pfrag,
+ int getfrag(void *from, char *to, int offset,
+ int len, int odd, struct sk_buff *skb),
+ void *from, int length, int transhdrlen,
+ unsigned int flags, struct ipcm6_cookie *ipc6)
+{
+ struct sk_buff *skb, *skb_prev = NULL;
+ unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu, pmtu;
+ int exthdrlen = 0;
+ int dst_exthdrlen = 0;
+ int hh_len;
+ int copy;
+ int err;
+ int offset = 0;
+ u32 tskey = 0;
+ struct rt6_info *rt = (struct rt6_info *)cork->dst;
+ struct ipv6_txoptions *opt = v6_cork->opt;
+ int csummode = CHECKSUM_NONE;
+ unsigned int maxnonfragsize, headersize;
+ unsigned int wmem_alloc_delta = 0;
+ bool paged;
+
+ skb = skb_peek_tail(queue);
+ if (!skb) {
+ exthdrlen = opt ? opt->opt_flen : 0;
+ dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len;
+ }
+
+ paged = !!cork->gso_size;
+ mtu = cork->gso_size ? IP6_MAX_MTU : cork->fragsize;
+ orig_mtu = mtu;
+
+ if (cork->tx_flags & SKBTX_ANY_SW_TSTAMP &&
+ sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)
+ tskey = sk->sk_tskey++;
+
+ hh_len = LL_RESERVED_SPACE(rt->dst.dev);
+
+ fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len +
+ (opt ? opt->opt_nflen : 0);
+ maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -
+ sizeof(struct frag_hdr);
+
+ headersize = sizeof(struct ipv6hdr) +
+ (opt ? opt->opt_flen + opt->opt_nflen : 0) +
+ (dst_allfrag(&rt->dst) ?
+ sizeof(struct frag_hdr) : 0) +
+ rt->rt6i_nfheader_len;
+
+ /* as per RFC 7112 section 5, the entire IPv6 Header Chain must fit
+ * the first fragment
+ */
+ if (headersize + transhdrlen > mtu)
+ goto emsgsize;
+
+ if (cork->length + length > mtu - headersize && ipc6->dontfrag &&
+ (sk->sk_protocol == IPPROTO_UDP ||
+ sk->sk_protocol == IPPROTO_RAW)) {
+ ipv6_local_rxpmtu(sk, fl6, mtu - headersize +
+ sizeof(struct ipv6hdr));
+ goto emsgsize;
+ }
+
+ if (ip6_sk_ignore_df(sk))
+ maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN;
+ else
+ maxnonfragsize = mtu;
+
+ if (cork->length + length > maxnonfragsize - headersize) {
+emsgsize:
+ pmtu = max_t(int, mtu - headersize + sizeof(struct ipv6hdr), 0);
+ ipv6_local_error(sk, EMSGSIZE, fl6, pmtu);
+ return -EMSGSIZE;
+ }
+
+ /* CHECKSUM_PARTIAL only with no extension headers and when
+ * we are not going to fragment
+ */
+ if (transhdrlen && sk->sk_protocol == IPPROTO_UDP &&
+ headersize == sizeof(struct ipv6hdr) &&
+ length <= mtu - headersize &&
+ (!(flags & MSG_MORE) || cork->gso_size) &&
+ rt->dst.dev->features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
+ csummode = CHECKSUM_PARTIAL;
+
+ /*
+ * Let's try using as much space as possible.
+ * Use MTU if total length of the message fits into the MTU.
+ * Otherwise, we need to reserve fragment header and
+ * fragment alignment (= 8-15 octects, in total).
+ *
+ * Note that we may need to "move" the data from the tail of
+ * of the buffer to the new fragment when we split
+ * the message.
+ *
+ * FIXME: It may be fragmented into multiple chunks
+ * at once if non-fragmentable extension headers
+ * are too large.
+ * --yoshfuji
+ */
+
+ cork->length += length;
+ if (!skb)
+ goto alloc_new_skb;
+
+ while (length > 0) {
+ /* Check if the remaining data fits into current packet. */
+ copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;
+ if (copy < length)
+ copy = maxfraglen - skb->len;
+
+ if (copy <= 0) {
+ char *data;
+ unsigned int datalen;
+ unsigned int fraglen;
+ unsigned int fraggap;
+ unsigned int alloclen;
+ unsigned int pagedlen = 0;
+alloc_new_skb:
+ /* There's no room in the current skb */
+ if (skb)
+ fraggap = skb->len - maxfraglen;
+ else
+ fraggap = 0;
+ /* update mtu and maxfraglen if necessary */
+ if (!skb || !skb_prev)
+ ip6_append_data_mtu(&mtu, &maxfraglen,
+ fragheaderlen, skb, rt,
+ orig_mtu);
+
+ skb_prev = skb;
+
+ /*
+ * If remaining data exceeds the mtu,
+ * we know we need more fragment(s).
+ */
+ datalen = length + fraggap;
+
+ if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
+ datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len;
+ fraglen = datalen + fragheaderlen;
+
+ if ((flags & MSG_MORE) &&
+ !(rt->dst.dev->features&NETIF_F_SG))
+ alloclen = mtu;
+ else if (!paged)
+ alloclen = fraglen;
+ else {
+ alloclen = min_t(int, fraglen, MAX_HEADER);
+ pagedlen = fraglen - alloclen;
+ }
+
+ alloclen += dst_exthdrlen;
+
+ if (datalen != length + fraggap) {
+ /*
+ * this is not the last fragment, the trailer
+ * space is regarded as data space.
+ */
+ datalen += rt->dst.trailer_len;
+ }
+
+ alloclen += rt->dst.trailer_len;
+ fraglen = datalen + fragheaderlen;
+
+ /*
+ * We just reserve space for fragment header.
+ * Note: this may be overallocation if the message
+ * (without MSG_MORE) fits into the MTU.
+ */
+ alloclen += sizeof(struct frag_hdr);
+
+ copy = datalen - transhdrlen - fraggap - pagedlen;
+ if (copy < 0) {
+ err = -EINVAL;
+ goto error;
+ }
+ if (transhdrlen) {
+ skb = sock_alloc_send_skb(sk,
+ alloclen + hh_len,
+ (flags & MSG_DONTWAIT), &err);
+ } else {
+ skb = NULL;
+ if (refcount_read(&sk->sk_wmem_alloc) + wmem_alloc_delta <=
+ 2 * sk->sk_sndbuf)
+ skb = alloc_skb(alloclen + hh_len,
+ sk->sk_allocation);
+ if (unlikely(!skb))
+ err = -ENOBUFS;
+ }
+ if (!skb)
+ goto error;
+ /*
+ * Fill in the control structures
+ */
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->ip_summed = csummode;
+ skb->csum = 0;
+ /* reserve for fragmentation and ipsec header */
+ skb_reserve(skb, hh_len + sizeof(struct frag_hdr) +
+ dst_exthdrlen);
+
+ /* Only the initial fragment is time stamped */
+ skb_shinfo(skb)->tx_flags = cork->tx_flags;
+ cork->tx_flags = 0;
+ skb_shinfo(skb)->tskey = tskey;
+ tskey = 0;
+
+ /*
+ * Find where to start putting bytes
+ */
+ data = skb_put(skb, fraglen - pagedlen);
+ skb_set_network_header(skb, exthdrlen);
+ data += fragheaderlen;
+ skb->transport_header = (skb->network_header +
+ fragheaderlen);
+ if (fraggap) {
+ skb->csum = skb_copy_and_csum_bits(
+ skb_prev, maxfraglen,
+ data + transhdrlen, fraggap, 0);
+ skb_prev->csum = csum_sub(skb_prev->csum,
+ skb->csum);
+ data += fraggap;
+ pskb_trim_unique(skb_prev, maxfraglen);
+ }
+ if (copy > 0 &&
+ getfrag(from, data + transhdrlen, offset,
+ copy, fraggap, skb) < 0) {
+ err = -EFAULT;
+ kfree_skb(skb);
+ goto error;
+ }
+
+ offset += copy;
+ length -= copy + transhdrlen;
+ transhdrlen = 0;
+ exthdrlen = 0;
+ dst_exthdrlen = 0;
+
+ if ((flags & MSG_CONFIRM) && !skb_prev)
+ skb_set_dst_pending_confirm(skb, 1);
+
+ /*
+ * Put the packet on the pending queue
+ */
+ if (!skb->destructor) {
+ skb->destructor = sock_wfree;
+ skb->sk = sk;
+ wmem_alloc_delta += skb->truesize;
+ }
+ __skb_queue_tail(queue, skb);
+ continue;
+ }
+
+ if (copy > length)
+ copy = length;
+
+ if (!(rt->dst.dev->features&NETIF_F_SG) &&
+ skb_tailroom(skb) >= copy) {
+ unsigned int off;
+
+ off = skb->len;
+ if (getfrag(from, skb_put(skb, copy),
+ offset, copy, off, skb) < 0) {
+ __skb_trim(skb, off);
+ err = -EFAULT;
+ goto error;
+ }
+ } else {
+ int i = skb_shinfo(skb)->nr_frags;
+
+ err = -ENOMEM;
+ if (!sk_page_frag_refill(sk, pfrag))
+ goto error;
+
+ if (!skb_can_coalesce(skb, i, pfrag->page,
+ pfrag->offset)) {
+ err = -EMSGSIZE;
+ if (i == MAX_SKB_FRAGS)
+ goto error;
+
+ __skb_fill_page_desc(skb, i, pfrag->page,
+ pfrag->offset, 0);
+ skb_shinfo(skb)->nr_frags = ++i;
+ get_page(pfrag->page);
+ }
+ copy = min_t(int, copy, pfrag->size - pfrag->offset);
+ if (getfrag(from,
+ page_address(pfrag->page) + pfrag->offset,
+ offset, copy, skb->len, skb) < 0)
+ goto error_efault;
+
+ pfrag->offset += copy;
+ skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
+ skb->len += copy;
+ skb->data_len += copy;
+ skb->truesize += copy;
+ wmem_alloc_delta += copy;
+ }
+ offset += copy;
+ length -= copy;
+ }
+
+ if (wmem_alloc_delta)
+ refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc);
+ return 0;
+
+error_efault:
+ err = -EFAULT;
+error:
+ cork->length -= length;
+ IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
+ refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc);
+ return err;
+}
+
+int ip6_append_data(struct sock *sk,
+ int getfrag(void *from, char *to, int offset, int len,
+ int odd, struct sk_buff *skb),
+ void *from, int length, int transhdrlen,
+ struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
+ struct rt6_info *rt, unsigned int flags)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ int exthdrlen;
+ int err;
+
+ if (flags&MSG_PROBE)
+ return 0;
+ if (skb_queue_empty(&sk->sk_write_queue)) {
+ /*
+ * setup for corking
+ */
+ err = ip6_setup_cork(sk, &inet->cork, &np->cork,
+ ipc6, rt, fl6);
+ if (err)
+ return err;
+
+ exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0);
+ length += exthdrlen;
+ transhdrlen += exthdrlen;
+ } else {
+ fl6 = &inet->cork.fl.u.ip6;
+ transhdrlen = 0;
+ }
+
+ return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base,
+ &np->cork, sk_page_frag(sk), getfrag,
+ from, length, transhdrlen, flags, ipc6);
+}
+EXPORT_SYMBOL_GPL(ip6_append_data);
+
+static void ip6_cork_release(struct inet_cork_full *cork,
+ struct inet6_cork *v6_cork)
+{
+ if (v6_cork->opt) {
+ kfree(v6_cork->opt->dst0opt);
+ kfree(v6_cork->opt->dst1opt);
+ kfree(v6_cork->opt->hopopt);
+ kfree(v6_cork->opt->srcrt);
+ kfree(v6_cork->opt);
+ v6_cork->opt = NULL;
+ }
+
+ if (cork->base.dst) {
+ dst_release(cork->base.dst);
+ cork->base.dst = NULL;
+ cork->base.flags &= ~IPCORK_ALLFRAG;
+ }
+ memset(&cork->fl, 0, sizeof(cork->fl));
+}
+
+struct sk_buff *__ip6_make_skb(struct sock *sk,
+ struct sk_buff_head *queue,
+ struct inet_cork_full *cork,
+ struct inet6_cork *v6_cork)
+{
+ struct sk_buff *skb, *tmp_skb;
+ struct sk_buff **tail_skb;
+ struct in6_addr final_dst_buf, *final_dst = &final_dst_buf;
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct net *net = sock_net(sk);
+ struct ipv6hdr *hdr;
+ struct ipv6_txoptions *opt = v6_cork->opt;
+ struct rt6_info *rt = (struct rt6_info *)cork->base.dst;
+ struct flowi6 *fl6 = &cork->fl.u.ip6;
+ unsigned char proto = fl6->flowi6_proto;
+
+ skb = __skb_dequeue(queue);
+ if (!skb)
+ goto out;
+ tail_skb = &(skb_shinfo(skb)->frag_list);
+
+ /* move skb->data to ip header from ext header */
+ if (skb->data < skb_network_header(skb))
+ __skb_pull(skb, skb_network_offset(skb));
+ while ((tmp_skb = __skb_dequeue(queue)) != NULL) {
+ __skb_pull(tmp_skb, skb_network_header_len(skb));
+ *tail_skb = tmp_skb;
+ tail_skb = &(tmp_skb->next);
+ skb->len += tmp_skb->len;
+ skb->data_len += tmp_skb->len;
+ skb->truesize += tmp_skb->truesize;
+ tmp_skb->destructor = NULL;
+ tmp_skb->sk = NULL;
+ }
+
+ /* Allow local fragmentation. */
+ skb->ignore_df = ip6_sk_ignore_df(sk);
+
+ *final_dst = fl6->daddr;
+ __skb_pull(skb, skb_network_header_len(skb));
+ if (opt && opt->opt_flen)
+ ipv6_push_frag_opts(skb, opt, &proto);
+ if (opt && opt->opt_nflen)
+ ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst, &fl6->saddr);
+
+ skb_push(skb, sizeof(struct ipv6hdr));
+ skb_reset_network_header(skb);
+ hdr = ipv6_hdr(skb);
+
+ ip6_flow_hdr(hdr, v6_cork->tclass,
+ ip6_make_flowlabel(net, skb, fl6->flowlabel,
+ ip6_autoflowlabel(net, np), fl6));
+ hdr->hop_limit = v6_cork->hop_limit;
+ hdr->nexthdr = proto;
+ hdr->saddr = fl6->saddr;
+ hdr->daddr = *final_dst;
+
+ skb->priority = sk->sk_priority;
+ skb->mark = sk->sk_mark;
+
+ skb->tstamp = cork->base.transmit_time;
+
+ skb_dst_set(skb, dst_clone(&rt->dst));
+ IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
+ if (proto == IPPROTO_ICMPV6) {
+ struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
+
+ ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type);
+ ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
+ }
+
+ ip6_cork_release(cork, v6_cork);
+out:
+ return skb;
+}
+
+int ip6_send_skb(struct sk_buff *skb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
+ int err;
+
+ err = ip6_local_out(net, skb->sk, skb);
+ if (err) {
+ if (err > 0)
+ err = net_xmit_errno(err);
+ if (err)
+ IP6_INC_STATS(net, rt->rt6i_idev,
+ IPSTATS_MIB_OUTDISCARDS);
+ }
+
+ return err;
+}
+
+int ip6_push_pending_frames(struct sock *sk)
+{
+ struct sk_buff *skb;
+
+ skb = ip6_finish_skb(sk);
+ if (!skb)
+ return 0;
+
+ return ip6_send_skb(skb);
+}
+EXPORT_SYMBOL_GPL(ip6_push_pending_frames);
+
+static void __ip6_flush_pending_frames(struct sock *sk,
+ struct sk_buff_head *queue,
+ struct inet_cork_full *cork,
+ struct inet6_cork *v6_cork)
+{
+ struct sk_buff *skb;
+
+ while ((skb = __skb_dequeue_tail(queue)) != NULL) {
+ if (skb_dst(skb))
+ IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_OUTDISCARDS);
+ kfree_skb(skb);
+ }
+
+ ip6_cork_release(cork, v6_cork);
+}
+
+void ip6_flush_pending_frames(struct sock *sk)
+{
+ __ip6_flush_pending_frames(sk, &sk->sk_write_queue,
+ &inet_sk(sk)->cork, &inet6_sk(sk)->cork);
+}
+EXPORT_SYMBOL_GPL(ip6_flush_pending_frames);
+
+struct sk_buff *ip6_make_skb(struct sock *sk,
+ int getfrag(void *from, char *to, int offset,
+ int len, int odd, struct sk_buff *skb),
+ void *from, int length, int transhdrlen,
+ struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
+ struct rt6_info *rt, unsigned int flags,
+ struct inet_cork_full *cork)
+{
+ struct inet6_cork v6_cork;
+ struct sk_buff_head queue;
+ int exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0);
+ int err;
+
+ if (flags & MSG_PROBE)
+ return NULL;
+
+ __skb_queue_head_init(&queue);
+
+ cork->base.flags = 0;
+ cork->base.addr = 0;
+ cork->base.opt = NULL;
+ cork->base.dst = NULL;
+ v6_cork.opt = NULL;
+ err = ip6_setup_cork(sk, cork, &v6_cork, ipc6, rt, fl6);
+ if (err) {
+ ip6_cork_release(cork, &v6_cork);
+ return ERR_PTR(err);
+ }
+ if (ipc6->dontfrag < 0)
+ ipc6->dontfrag = inet6_sk(sk)->dontfrag;
+
+ err = __ip6_append_data(sk, fl6, &queue, &cork->base, &v6_cork,
+ ¤t->task_frag, getfrag, from,
+ length + exthdrlen, transhdrlen + exthdrlen,
+ flags, ipc6);
+ if (err) {
+ __ip6_flush_pending_frames(sk, &queue, cork, &v6_cork);
+ return ERR_PTR(err);
+ }
+
+ return __ip6_make_skb(sk, &queue, cork, &v6_cork);
+}
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
new file mode 100644
index 0000000..a9d06d4
--- /dev/null
+++ b/net/ipv6/ip6_tunnel.c
@@ -0,0 +1,2349 @@
+/*
+ * IPv6 tunneling device
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Ville Nuorvala <vnuorval@tcs.hut.fi>
+ * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
+ *
+ * Based on:
+ * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
+ *
+ * RFC 2473
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/sockios.h>
+#include <linux/icmp.h>
+#include <linux/if.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/icmpv6.h>
+#include <linux/init.h>
+#include <linux/route.h>
+#include <linux/rtnetlink.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/slab.h>
+#include <linux/hash.h>
+#include <linux/etherdevice.h>
+
+#include <linux/uaccess.h>
+#include <linux/atomic.h>
+
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/ip6_tunnel.h>
+#include <net/xfrm.h>
+#include <net/dsfield.h>
+#include <net/inet_ecn.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/dst_metadata.h>
+
+MODULE_AUTHOR("Ville Nuorvala");
+MODULE_DESCRIPTION("IPv6 tunneling device");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_RTNL_LINK("ip6tnl");
+MODULE_ALIAS_NETDEV("ip6tnl0");
+
+#define IP6_TUNNEL_HASH_SIZE_SHIFT 5
+#define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
+
+static bool log_ecn_error = true;
+module_param(log_ecn_error, bool, 0644);
+MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+
+static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
+{
+ u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
+
+ return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
+}
+
+static int ip6_tnl_dev_init(struct net_device *dev);
+static void ip6_tnl_dev_setup(struct net_device *dev);
+static struct rtnl_link_ops ip6_link_ops __read_mostly;
+
+static unsigned int ip6_tnl_net_id __read_mostly;
+struct ip6_tnl_net {
+ /* the IPv6 tunnel fallback device */
+ struct net_device *fb_tnl_dev;
+ /* lists for storing tunnels in use */
+ struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
+ struct ip6_tnl __rcu *tnls_wc[1];
+ struct ip6_tnl __rcu **tnls[2];
+ struct ip6_tnl __rcu *collect_md_tun;
+};
+
+static struct net_device_stats *ip6_get_stats(struct net_device *dev)
+{
+ struct pcpu_sw_netstats tmp, sum = { 0 };
+ int i;
+
+ for_each_possible_cpu(i) {
+ unsigned int start;
+ const struct pcpu_sw_netstats *tstats =
+ per_cpu_ptr(dev->tstats, i);
+
+ do {
+ start = u64_stats_fetch_begin_irq(&tstats->syncp);
+ tmp.rx_packets = tstats->rx_packets;
+ tmp.rx_bytes = tstats->rx_bytes;
+ tmp.tx_packets = tstats->tx_packets;
+ tmp.tx_bytes = tstats->tx_bytes;
+ } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
+
+ sum.rx_packets += tmp.rx_packets;
+ sum.rx_bytes += tmp.rx_bytes;
+ sum.tx_packets += tmp.tx_packets;
+ sum.tx_bytes += tmp.tx_bytes;
+ }
+ dev->stats.rx_packets = sum.rx_packets;
+ dev->stats.rx_bytes = sum.rx_bytes;
+ dev->stats.tx_packets = sum.tx_packets;
+ dev->stats.tx_bytes = sum.tx_bytes;
+ return &dev->stats;
+}
+
+/**
+ * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
+ * @remote: the address of the tunnel exit-point
+ * @local: the address of the tunnel entry-point
+ *
+ * Return:
+ * tunnel matching given end-points if found,
+ * else fallback tunnel if its device is up,
+ * else %NULL
+ **/
+
+#define for_each_ip6_tunnel_rcu(start) \
+ for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
+
+static struct ip6_tnl *
+ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
+{
+ unsigned int hash = HASH(remote, local);
+ struct ip6_tnl *t;
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+ struct in6_addr any;
+
+ for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
+ if (ipv6_addr_equal(local, &t->parms.laddr) &&
+ ipv6_addr_equal(remote, &t->parms.raddr) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+
+ memset(&any, 0, sizeof(any));
+ hash = HASH(&any, local);
+ for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
+ if (ipv6_addr_equal(local, &t->parms.laddr) &&
+ ipv6_addr_any(&t->parms.raddr) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+
+ hash = HASH(remote, &any);
+ for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
+ if (ipv6_addr_equal(remote, &t->parms.raddr) &&
+ ipv6_addr_any(&t->parms.laddr) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+
+ t = rcu_dereference(ip6n->collect_md_tun);
+ if (t && t->dev->flags & IFF_UP)
+ return t;
+
+ t = rcu_dereference(ip6n->tnls_wc[0]);
+ if (t && (t->dev->flags & IFF_UP))
+ return t;
+
+ return NULL;
+}
+
+/**
+ * ip6_tnl_bucket - get head of list matching given tunnel parameters
+ * @p: parameters containing tunnel end-points
+ *
+ * Description:
+ * ip6_tnl_bucket() returns the head of the list matching the
+ * &struct in6_addr entries laddr and raddr in @p.
+ *
+ * Return: head of IPv6 tunnel list
+ **/
+
+static struct ip6_tnl __rcu **
+ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
+{
+ const struct in6_addr *remote = &p->raddr;
+ const struct in6_addr *local = &p->laddr;
+ unsigned int h = 0;
+ int prio = 0;
+
+ if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
+ prio = 1;
+ h = HASH(remote, local);
+ }
+ return &ip6n->tnls[prio][h];
+}
+
+/**
+ * ip6_tnl_link - add tunnel to hash table
+ * @t: tunnel to be added
+ **/
+
+static void
+ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
+{
+ struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
+
+ if (t->parms.collect_md)
+ rcu_assign_pointer(ip6n->collect_md_tun, t);
+ rcu_assign_pointer(t->next , rtnl_dereference(*tp));
+ rcu_assign_pointer(*tp, t);
+}
+
+/**
+ * ip6_tnl_unlink - remove tunnel from hash table
+ * @t: tunnel to be removed
+ **/
+
+static void
+ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
+{
+ struct ip6_tnl __rcu **tp;
+ struct ip6_tnl *iter;
+
+ if (t->parms.collect_md)
+ rcu_assign_pointer(ip6n->collect_md_tun, NULL);
+
+ for (tp = ip6_tnl_bucket(ip6n, &t->parms);
+ (iter = rtnl_dereference(*tp)) != NULL;
+ tp = &iter->next) {
+ if (t == iter) {
+ rcu_assign_pointer(*tp, t->next);
+ break;
+ }
+ }
+}
+
+static void ip6_dev_free(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+
+ gro_cells_destroy(&t->gro_cells);
+ dst_cache_destroy(&t->dst_cache);
+ free_percpu(dev->tstats);
+}
+
+static int ip6_tnl_create2(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net *net = dev_net(dev);
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+ int err;
+
+ t = netdev_priv(dev);
+
+ dev->rtnl_link_ops = &ip6_link_ops;
+ err = register_netdevice(dev);
+ if (err < 0)
+ goto out;
+
+ strcpy(t->parms.name, dev->name);
+
+ dev_hold(dev);
+ ip6_tnl_link(ip6n, t);
+ return 0;
+
+out:
+ return err;
+}
+
+/**
+ * ip6_tnl_create - create a new tunnel
+ * @p: tunnel parameters
+ * @pt: pointer to new tunnel
+ *
+ * Description:
+ * Create tunnel matching given parameters.
+ *
+ * Return:
+ * created tunnel or error pointer
+ **/
+
+static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
+{
+ struct net_device *dev;
+ struct ip6_tnl *t;
+ char name[IFNAMSIZ];
+ int err = -E2BIG;
+
+ if (p->name[0]) {
+ if (!dev_valid_name(p->name))
+ goto failed;
+ strlcpy(name, p->name, IFNAMSIZ);
+ } else {
+ sprintf(name, "ip6tnl%%d");
+ }
+ err = -ENOMEM;
+ dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
+ ip6_tnl_dev_setup);
+ if (!dev)
+ goto failed;
+
+ dev_net_set(dev, net);
+
+ t = netdev_priv(dev);
+ t->parms = *p;
+ t->net = dev_net(dev);
+ err = ip6_tnl_create2(dev);
+ if (err < 0)
+ goto failed_free;
+
+ return t;
+
+failed_free:
+ free_netdev(dev);
+failed:
+ return ERR_PTR(err);
+}
+
+/**
+ * ip6_tnl_locate - find or create tunnel matching given parameters
+ * @p: tunnel parameters
+ * @create: != 0 if allowed to create new tunnel if no match found
+ *
+ * Description:
+ * ip6_tnl_locate() first tries to locate an existing tunnel
+ * based on @parms. If this is unsuccessful, but @create is set a new
+ * tunnel device is created and registered for use.
+ *
+ * Return:
+ * matching tunnel or error pointer
+ **/
+
+static struct ip6_tnl *ip6_tnl_locate(struct net *net,
+ struct __ip6_tnl_parm *p, int create)
+{
+ const struct in6_addr *remote = &p->raddr;
+ const struct in6_addr *local = &p->laddr;
+ struct ip6_tnl __rcu **tp;
+ struct ip6_tnl *t;
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ for (tp = ip6_tnl_bucket(ip6n, p);
+ (t = rtnl_dereference(*tp)) != NULL;
+ tp = &t->next) {
+ if (ipv6_addr_equal(local, &t->parms.laddr) &&
+ ipv6_addr_equal(remote, &t->parms.raddr)) {
+ if (create)
+ return ERR_PTR(-EEXIST);
+
+ return t;
+ }
+ }
+ if (!create)
+ return ERR_PTR(-ENODEV);
+ return ip6_tnl_create(net, p);
+}
+
+/**
+ * ip6_tnl_dev_uninit - tunnel device uninitializer
+ * @dev: the device to be destroyed
+ *
+ * Description:
+ * ip6_tnl_dev_uninit() removes tunnel from its list
+ **/
+
+static void
+ip6_tnl_dev_uninit(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net *net = t->net;
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ if (dev == ip6n->fb_tnl_dev)
+ RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
+ else
+ ip6_tnl_unlink(ip6n, t);
+ dst_cache_reset(&t->dst_cache);
+ dev_put(dev);
+}
+
+/**
+ * parse_tvl_tnl_enc_lim - handle encapsulation limit option
+ * @skb: received socket buffer
+ *
+ * Return:
+ * 0 if none was found,
+ * else index to encapsulation limit
+ **/
+
+__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
+{
+ const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
+ unsigned int nhoff = raw - skb->data;
+ unsigned int off = nhoff + sizeof(*ipv6h);
+ u8 next, nexthdr = ipv6h->nexthdr;
+
+ while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
+ struct ipv6_opt_hdr *hdr;
+ u16 optlen;
+
+ if (!pskb_may_pull(skb, off + sizeof(*hdr)))
+ break;
+
+ hdr = (struct ipv6_opt_hdr *)(skb->data + off);
+ if (nexthdr == NEXTHDR_FRAGMENT) {
+ struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
+ if (frag_hdr->frag_off)
+ break;
+ optlen = 8;
+ } else if (nexthdr == NEXTHDR_AUTH) {
+ optlen = (hdr->hdrlen + 2) << 2;
+ } else {
+ optlen = ipv6_optlen(hdr);
+ }
+ /* cache hdr->nexthdr, since pskb_may_pull() might
+ * invalidate hdr
+ */
+ next = hdr->nexthdr;
+ if (nexthdr == NEXTHDR_DEST) {
+ u16 i = 2;
+
+ /* Remember : hdr is no longer valid at this point. */
+ if (!pskb_may_pull(skb, off + optlen))
+ break;
+
+ while (1) {
+ struct ipv6_tlv_tnl_enc_lim *tel;
+
+ /* No more room for encapsulation limit */
+ if (i + sizeof(*tel) > optlen)
+ break;
+
+ tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
+ /* return index of option if found and valid */
+ if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
+ tel->length == 1)
+ return i + off - nhoff;
+ /* else jump to next option */
+ if (tel->type)
+ i += tel->length + 2;
+ else
+ i++;
+ }
+ }
+ nexthdr = next;
+ off += optlen;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
+
+/**
+ * ip6_tnl_err - tunnel error handler
+ *
+ * Description:
+ * ip6_tnl_err() should handle errors in the tunnel according
+ * to the specifications in RFC 2473.
+ **/
+
+static int
+ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
+ u8 *type, u8 *code, int *msg, __u32 *info, int offset)
+{
+ const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
+ struct net *net = dev_net(skb->dev);
+ u8 rel_type = ICMPV6_DEST_UNREACH;
+ u8 rel_code = ICMPV6_ADDR_UNREACH;
+ __u32 rel_info = 0;
+ struct ip6_tnl *t;
+ int err = -ENOENT;
+ int rel_msg = 0;
+ u8 tproto;
+ __u16 len;
+
+ /* If the packet doesn't contain the original IPv6 header we are
+ in trouble since we might need the source address for further
+ processing of the error. */
+
+ rcu_read_lock();
+ t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
+ if (!t)
+ goto out;
+
+ tproto = READ_ONCE(t->parms.proto);
+ if (tproto != ipproto && tproto != 0)
+ goto out;
+
+ err = 0;
+
+ switch (*type) {
+ struct ipv6_tlv_tnl_enc_lim *tel;
+ __u32 mtu, teli;
+ case ICMPV6_DEST_UNREACH:
+ net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
+ t->parms.name);
+ rel_msg = 1;
+ break;
+ case ICMPV6_TIME_EXCEED:
+ if ((*code) == ICMPV6_EXC_HOPLIMIT) {
+ net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
+ t->parms.name);
+ rel_msg = 1;
+ }
+ break;
+ case ICMPV6_PARAMPROB:
+ teli = 0;
+ if ((*code) == ICMPV6_HDR_FIELD)
+ teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
+
+ if (teli && teli == *info - 2) {
+ tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
+ if (tel->encap_limit == 0) {
+ net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
+ t->parms.name);
+ rel_msg = 1;
+ }
+ } else {
+ net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
+ t->parms.name);
+ }
+ break;
+ case ICMPV6_PKT_TOOBIG:
+ ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
+ sock_net_uid(net, NULL));
+ mtu = *info - offset;
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
+ len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
+ if (len > mtu) {
+ rel_type = ICMPV6_PKT_TOOBIG;
+ rel_code = 0;
+ rel_info = mtu;
+ rel_msg = 1;
+ }
+ break;
+ case NDISC_REDIRECT:
+ ip6_redirect(skb, net, skb->dev->ifindex, 0,
+ sock_net_uid(net, NULL));
+ break;
+ }
+
+ *type = rel_type;
+ *code = rel_code;
+ *info = rel_info;
+ *msg = rel_msg;
+
+out:
+ rcu_read_unlock();
+ return err;
+}
+
+static int
+ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ __u32 rel_info = ntohl(info);
+ const struct iphdr *eiph;
+ struct sk_buff *skb2;
+ int err, rel_msg = 0;
+ u8 rel_type = type;
+ u8 rel_code = code;
+ struct rtable *rt;
+ struct flowi4 fl4;
+
+ err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
+ &rel_msg, &rel_info, offset);
+ if (err < 0)
+ return err;
+
+ if (rel_msg == 0)
+ return 0;
+
+ switch (rel_type) {
+ case ICMPV6_DEST_UNREACH:
+ if (rel_code != ICMPV6_ADDR_UNREACH)
+ return 0;
+ rel_type = ICMP_DEST_UNREACH;
+ rel_code = ICMP_HOST_UNREACH;
+ break;
+ case ICMPV6_PKT_TOOBIG:
+ if (rel_code != 0)
+ return 0;
+ rel_type = ICMP_DEST_UNREACH;
+ rel_code = ICMP_FRAG_NEEDED;
+ break;
+ default:
+ return 0;
+ }
+
+ if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
+ return 0;
+
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (!skb2)
+ return 0;
+
+ skb_dst_drop(skb2);
+
+ skb_pull(skb2, offset);
+ skb_reset_network_header(skb2);
+ eiph = ip_hdr(skb2);
+
+ /* Try to guess incoming interface */
+ rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
+ 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
+ if (IS_ERR(rt))
+ goto out;
+
+ skb2->dev = rt->dst.dev;
+ ip_rt_put(rt);
+
+ /* route "incoming" packet */
+ if (rt->rt_flags & RTCF_LOCAL) {
+ rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
+ eiph->daddr, eiph->saddr, 0, 0,
+ IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
+ if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL) {
+ if (!IS_ERR(rt))
+ ip_rt_put(rt);
+ goto out;
+ }
+ skb_dst_set(skb2, &rt->dst);
+ } else {
+ if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
+ skb2->dev) ||
+ skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
+ goto out;
+ }
+
+ /* change mtu on this route */
+ if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
+ if (rel_info > dst_mtu(skb_dst(skb2)))
+ goto out;
+
+ skb_dst_update_pmtu(skb2, rel_info);
+ }
+
+ icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
+
+out:
+ kfree_skb(skb2);
+ return 0;
+}
+
+static int
+ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ __u32 rel_info = ntohl(info);
+ int err, rel_msg = 0;
+ u8 rel_type = type;
+ u8 rel_code = code;
+
+ err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
+ &rel_msg, &rel_info, offset);
+ if (err < 0)
+ return err;
+
+ if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
+ struct rt6_info *rt;
+ struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+
+ if (!skb2)
+ return 0;
+
+ skb_dst_drop(skb2);
+ skb_pull(skb2, offset);
+ skb_reset_network_header(skb2);
+
+ /* Try to guess incoming interface */
+ rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
+ NULL, 0, skb2, 0);
+
+ if (rt && rt->dst.dev)
+ skb2->dev = rt->dst.dev;
+
+ icmpv6_send(skb2, rel_type, rel_code, rel_info);
+
+ ip6_rt_put(rt);
+
+ kfree_skb(skb2);
+ }
+
+ return 0;
+}
+
+static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
+ const struct ipv6hdr *ipv6h,
+ struct sk_buff *skb)
+{
+ __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
+
+ if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
+ ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
+
+ return IP6_ECN_decapsulate(ipv6h, skb);
+}
+
+static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
+ const struct ipv6hdr *ipv6h,
+ struct sk_buff *skb)
+{
+ if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
+ ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
+
+ return IP6_ECN_decapsulate(ipv6h, skb);
+}
+
+__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
+ const struct in6_addr *laddr,
+ const struct in6_addr *raddr)
+{
+ struct __ip6_tnl_parm *p = &t->parms;
+ int ltype = ipv6_addr_type(laddr);
+ int rtype = ipv6_addr_type(raddr);
+ __u32 flags = 0;
+
+ if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
+ flags = IP6_TNL_F_CAP_PER_PACKET;
+ } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
+ rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
+ !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
+ (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
+ if (ltype&IPV6_ADDR_UNICAST)
+ flags |= IP6_TNL_F_CAP_XMIT;
+ if (rtype&IPV6_ADDR_UNICAST)
+ flags |= IP6_TNL_F_CAP_RCV;
+ }
+ return flags;
+}
+EXPORT_SYMBOL(ip6_tnl_get_cap);
+
+/* called with rcu_read_lock() */
+int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
+ const struct in6_addr *laddr,
+ const struct in6_addr *raddr)
+{
+ struct __ip6_tnl_parm *p = &t->parms;
+ int ret = 0;
+ struct net *net = t->net;
+
+ if ((p->flags & IP6_TNL_F_CAP_RCV) ||
+ ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
+ (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
+ struct net_device *ldev = NULL;
+
+ if (p->link)
+ ldev = dev_get_by_index_rcu(net, p->link);
+
+ if ((ipv6_addr_is_multicast(laddr) ||
+ likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
+ 0, IFA_F_TENTATIVE))) &&
+ ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
+ likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
+ 0, IFA_F_TENTATIVE))))
+ ret = 1;
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
+
+static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
+ const struct tnl_ptk_info *tpi,
+ struct metadata_dst *tun_dst,
+ int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
+ const struct ipv6hdr *ipv6h,
+ struct sk_buff *skb),
+ bool log_ecn_err)
+{
+ struct pcpu_sw_netstats *tstats;
+ const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ int err;
+
+ if ((!(tpi->flags & TUNNEL_CSUM) &&
+ (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
+ ((tpi->flags & TUNNEL_CSUM) &&
+ !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
+ tunnel->dev->stats.rx_crc_errors++;
+ tunnel->dev->stats.rx_errors++;
+ goto drop;
+ }
+
+ if (tunnel->parms.i_flags & TUNNEL_SEQ) {
+ if (!(tpi->flags & TUNNEL_SEQ) ||
+ (tunnel->i_seqno &&
+ (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
+ tunnel->dev->stats.rx_fifo_errors++;
+ tunnel->dev->stats.rx_errors++;
+ goto drop;
+ }
+ tunnel->i_seqno = ntohl(tpi->seq) + 1;
+ }
+
+ skb->protocol = tpi->proto;
+
+ /* Warning: All skb pointers will be invalidated! */
+ if (tunnel->dev->type == ARPHRD_ETHER) {
+ if (!pskb_may_pull(skb, ETH_HLEN)) {
+ tunnel->dev->stats.rx_length_errors++;
+ tunnel->dev->stats.rx_errors++;
+ goto drop;
+ }
+
+ ipv6h = ipv6_hdr(skb);
+ skb->protocol = eth_type_trans(skb, tunnel->dev);
+ skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+ } else {
+ skb->dev = tunnel->dev;
+ }
+
+ skb_reset_network_header(skb);
+ memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
+
+ __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
+
+ err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
+ if (unlikely(err)) {
+ if (log_ecn_err)
+ net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
+ &ipv6h->saddr,
+ ipv6_get_dsfield(ipv6h));
+ if (err > 1) {
+ ++tunnel->dev->stats.rx_frame_errors;
+ ++tunnel->dev->stats.rx_errors;
+ goto drop;
+ }
+ }
+
+ tstats = this_cpu_ptr(tunnel->dev->tstats);
+ u64_stats_update_begin(&tstats->syncp);
+ tstats->rx_packets++;
+ tstats->rx_bytes += skb->len;
+ u64_stats_update_end(&tstats->syncp);
+
+ skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
+
+ if (tun_dst)
+ skb_dst_set(skb, (struct dst_entry *)tun_dst);
+
+ gro_cells_receive(&tunnel->gro_cells, skb);
+ return 0;
+
+drop:
+ if (tun_dst)
+ dst_release((struct dst_entry *)tun_dst);
+ kfree_skb(skb);
+ return 0;
+}
+
+int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
+ const struct tnl_ptk_info *tpi,
+ struct metadata_dst *tun_dst,
+ bool log_ecn_err)
+{
+ return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate,
+ log_ecn_err);
+}
+EXPORT_SYMBOL(ip6_tnl_rcv);
+
+static const struct tnl_ptk_info tpi_v6 = {
+ /* no tunnel info required for ipxip6. */
+ .proto = htons(ETH_P_IPV6),
+};
+
+static const struct tnl_ptk_info tpi_v4 = {
+ /* no tunnel info required for ipxip6. */
+ .proto = htons(ETH_P_IP),
+};
+
+static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
+ const struct tnl_ptk_info *tpi,
+ int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
+ const struct ipv6hdr *ipv6h,
+ struct sk_buff *skb))
+{
+ struct ip6_tnl *t;
+ const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ struct metadata_dst *tun_dst = NULL;
+ int ret = -1;
+
+ rcu_read_lock();
+ t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
+
+ if (t) {
+ u8 tproto = READ_ONCE(t->parms.proto);
+
+ if (tproto != ipproto && tproto != 0)
+ goto drop;
+ if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
+ goto drop;
+ if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
+ goto drop;
+ if (iptunnel_pull_header(skb, 0, tpi->proto, false))
+ goto drop;
+ if (t->parms.collect_md) {
+ tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
+ if (!tun_dst)
+ goto drop;
+ }
+ ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
+ log_ecn_error);
+ }
+
+ rcu_read_unlock();
+
+ return ret;
+
+drop:
+ rcu_read_unlock();
+ kfree_skb(skb);
+ return 0;
+}
+
+static int ip4ip6_rcv(struct sk_buff *skb)
+{
+ return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
+ ip4ip6_dscp_ecn_decapsulate);
+}
+
+static int ip6ip6_rcv(struct sk_buff *skb)
+{
+ return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
+ ip6ip6_dscp_ecn_decapsulate);
+}
+
+struct ipv6_tel_txoption {
+ struct ipv6_txoptions ops;
+ __u8 dst_opt[8];
+};
+
+static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
+{
+ memset(opt, 0, sizeof(struct ipv6_tel_txoption));
+
+ opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
+ opt->dst_opt[3] = 1;
+ opt->dst_opt[4] = encap_limit;
+ opt->dst_opt[5] = IPV6_TLV_PADN;
+ opt->dst_opt[6] = 1;
+
+ opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
+ opt->ops.opt_nflen = 8;
+}
+
+/**
+ * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
+ * @t: the outgoing tunnel device
+ * @hdr: IPv6 header from the incoming packet
+ *
+ * Description:
+ * Avoid trivial tunneling loop by checking that tunnel exit-point
+ * doesn't match source of incoming packet.
+ *
+ * Return:
+ * 1 if conflict,
+ * 0 else
+ **/
+
+static inline bool
+ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
+{
+ return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
+}
+
+int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
+ const struct in6_addr *laddr,
+ const struct in6_addr *raddr)
+{
+ struct __ip6_tnl_parm *p = &t->parms;
+ int ret = 0;
+ struct net *net = t->net;
+
+ if (t->parms.collect_md)
+ return 1;
+
+ if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
+ ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
+ (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
+ struct net_device *ldev = NULL;
+
+ rcu_read_lock();
+ if (p->link)
+ ldev = dev_get_by_index_rcu(net, p->link);
+
+ if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
+ 0, IFA_F_TENTATIVE)))
+ pr_warn("%s xmit: Local address not yet configured!\n",
+ p->name);
+ else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
+ !ipv6_addr_is_multicast(raddr) &&
+ unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
+ true, 0, IFA_F_TENTATIVE)))
+ pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
+ p->name);
+ else
+ ret = 1;
+ rcu_read_unlock();
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
+
+/**
+ * ip6_tnl_xmit - encapsulate packet and send
+ * @skb: the outgoing socket buffer
+ * @dev: the outgoing tunnel device
+ * @dsfield: dscp code for outer header
+ * @fl6: flow of tunneled packet
+ * @encap_limit: encapsulation limit
+ * @pmtu: Path MTU is stored if packet is too big
+ * @proto: next header value
+ *
+ * Description:
+ * Build new header and do some sanity checks on the packet before sending
+ * it.
+ *
+ * Return:
+ * 0 on success
+ * -1 fail
+ * %-EMSGSIZE message too big. return mtu in this case.
+ **/
+
+int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
+ struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
+ __u8 proto)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net *net = t->net;
+ struct net_device_stats *stats = &t->dev->stats;
+ struct ipv6hdr *ipv6h;
+ struct ipv6_tel_txoption opt;
+ struct dst_entry *dst = NULL, *ndst = NULL;
+ struct net_device *tdev;
+ int mtu;
+ unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
+ unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
+ unsigned int max_headroom = psh_hlen;
+ bool use_cache = false;
+ u8 hop_limit;
+ int err = -1;
+
+ if (t->parms.collect_md) {
+ hop_limit = skb_tunnel_info(skb)->key.ttl;
+ goto route_lookup;
+ } else {
+ hop_limit = t->parms.hop_limit;
+ }
+
+ /* NBMA tunnel */
+ if (ipv6_addr_any(&t->parms.raddr)) {
+ if (skb->protocol == htons(ETH_P_IPV6)) {
+ struct in6_addr *addr6;
+ struct neighbour *neigh;
+ int addr_type;
+
+ if (!skb_dst(skb))
+ goto tx_err_link_failure;
+
+ neigh = dst_neigh_lookup(skb_dst(skb),
+ &ipv6_hdr(skb)->daddr);
+ if (!neigh)
+ goto tx_err_link_failure;
+
+ addr6 = (struct in6_addr *)&neigh->primary_key;
+ addr_type = ipv6_addr_type(addr6);
+
+ if (addr_type == IPV6_ADDR_ANY)
+ addr6 = &ipv6_hdr(skb)->daddr;
+
+ memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
+ neigh_release(neigh);
+ }
+ } else if (t->parms.proto != 0 && !(t->parms.flags &
+ (IP6_TNL_F_USE_ORIG_TCLASS |
+ IP6_TNL_F_USE_ORIG_FWMARK))) {
+ /* enable the cache only if neither the outer protocol nor the
+ * routing decision depends on the current inner header value
+ */
+ use_cache = true;
+ }
+
+ if (use_cache)
+ dst = dst_cache_get(&t->dst_cache);
+
+ if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
+ goto tx_err_link_failure;
+
+ if (!dst) {
+route_lookup:
+ /* add dsfield to flowlabel for route lookup */
+ fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
+
+ dst = ip6_route_output(net, NULL, fl6);
+
+ if (dst->error)
+ goto tx_err_link_failure;
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ dst = NULL;
+ goto tx_err_link_failure;
+ }
+ if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
+ ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
+ &fl6->daddr, 0, &fl6->saddr))
+ goto tx_err_link_failure;
+ ndst = dst;
+ }
+
+ tdev = dst->dev;
+
+ if (tdev == dev) {
+ stats->collisions++;
+ net_warn_ratelimited("%s: Local routing loop detected!\n",
+ t->parms.name);
+ goto tx_err_dst_release;
+ }
+ mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
+ if (encap_limit >= 0) {
+ max_headroom += 8;
+ mtu -= 8;
+ }
+ mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
+ IPV6_MIN_MTU : IPV4_MIN_MTU);
+
+ skb_dst_update_pmtu(skb, mtu);
+ if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
+ *pmtu = mtu;
+ err = -EMSGSIZE;
+ goto tx_err_dst_release;
+ }
+
+ if (t->err_count > 0) {
+ if (time_before(jiffies,
+ t->err_time + IP6TUNNEL_ERR_TIMEO)) {
+ t->err_count--;
+
+ dst_link_failure(skb);
+ } else {
+ t->err_count = 0;
+ }
+ }
+
+ skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
+
+ /*
+ * Okay, now see if we can stuff it in the buffer as-is.
+ */
+ max_headroom += LL_RESERVED_SPACE(tdev);
+
+ if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
+ (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
+ struct sk_buff *new_skb;
+
+ new_skb = skb_realloc_headroom(skb, max_headroom);
+ if (!new_skb)
+ goto tx_err_dst_release;
+
+ if (skb->sk)
+ skb_set_owner_w(new_skb, skb->sk);
+ consume_skb(skb);
+ skb = new_skb;
+ }
+
+ if (t->parms.collect_md) {
+ if (t->encap.type != TUNNEL_ENCAP_NONE)
+ goto tx_err_dst_release;
+ } else {
+ if (use_cache && ndst)
+ dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
+ }
+ skb_dst_set(skb, dst);
+
+ if (hop_limit == 0) {
+ if (skb->protocol == htons(ETH_P_IP))
+ hop_limit = ip_hdr(skb)->ttl;
+ else if (skb->protocol == htons(ETH_P_IPV6))
+ hop_limit = ipv6_hdr(skb)->hop_limit;
+ else
+ hop_limit = ip6_dst_hoplimit(dst);
+ }
+
+ /* Calculate max headroom for all the headers and adjust
+ * needed_headroom if necessary.
+ */
+ max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
+ + dst->header_len + t->hlen;
+ if (max_headroom > dev->needed_headroom)
+ dev->needed_headroom = max_headroom;
+
+ err = ip6_tnl_encap(skb, t, &proto, fl6);
+ if (err)
+ return err;
+
+ if (encap_limit >= 0) {
+ init_tel_txopt(&opt, encap_limit);
+ ipv6_push_frag_opts(skb, &opt.ops, &proto);
+ }
+
+ skb_push(skb, sizeof(struct ipv6hdr));
+ skb_reset_network_header(skb);
+ ipv6h = ipv6_hdr(skb);
+ ip6_flow_hdr(ipv6h, dsfield,
+ ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
+ ipv6h->hop_limit = hop_limit;
+ ipv6h->nexthdr = proto;
+ ipv6h->saddr = fl6->saddr;
+ ipv6h->daddr = fl6->daddr;
+ ip6tunnel_xmit(NULL, skb, dev);
+ return 0;
+tx_err_link_failure:
+ stats->tx_carrier_errors++;
+ dst_link_failure(skb);
+tx_err_dst_release:
+ dst_release(dst);
+ return err;
+}
+EXPORT_SYMBOL(ip6_tnl_xmit);
+
+static inline int
+ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ const struct iphdr *iph;
+ int encap_limit = -1;
+ struct flowi6 fl6;
+ __u8 dsfield;
+ __u32 mtu;
+ u8 tproto;
+ int err;
+
+ /* ensure we can access the full inner ip header */
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ return -1;
+
+ iph = ip_hdr(skb);
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+
+ tproto = READ_ONCE(t->parms.proto);
+ if (tproto != IPPROTO_IPIP && tproto != 0)
+ return -1;
+
+ if (t->parms.collect_md) {
+ struct ip_tunnel_info *tun_info;
+ const struct ip_tunnel_key *key;
+
+ tun_info = skb_tunnel_info(skb);
+ if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
+ ip_tunnel_info_af(tun_info) != AF_INET6))
+ return -1;
+ key = &tun_info->key;
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_IPIP;
+ fl6.saddr = key->u.ipv6.src;
+ fl6.daddr = key->u.ipv6.dst;
+ fl6.flowlabel = key->label;
+ dsfield = key->tos;
+ } else {
+ if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ encap_limit = t->parms.encap_limit;
+
+ memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_IPIP;
+
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
+ dsfield = ipv4_get_dsfield(iph);
+ else
+ dsfield = ip6_tclass(t->parms.flowinfo);
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
+ fl6.flowi6_mark = skb->mark;
+ else
+ fl6.flowi6_mark = t->parms.fwmark;
+ }
+
+ fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
+
+ if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
+ return -1;
+
+ dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph));
+
+ skb_set_inner_ipproto(skb, IPPROTO_IPIP);
+
+ err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
+ IPPROTO_IPIP);
+ if (err != 0) {
+ /* XXX: send ICMP error even if DF is not set. */
+ if (err == -EMSGSIZE)
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+ htonl(mtu));
+ return -1;
+ }
+
+ return 0;
+}
+
+static inline int
+ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct ipv6hdr *ipv6h;
+ int encap_limit = -1;
+ __u16 offset;
+ struct flowi6 fl6;
+ __u8 dsfield;
+ __u32 mtu;
+ u8 tproto;
+ int err;
+
+ if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
+ return -1;
+
+ ipv6h = ipv6_hdr(skb);
+ tproto = READ_ONCE(t->parms.proto);
+ if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
+ ip6_tnl_addr_conflict(t, ipv6h))
+ return -1;
+
+ if (t->parms.collect_md) {
+ struct ip_tunnel_info *tun_info;
+ const struct ip_tunnel_key *key;
+
+ tun_info = skb_tunnel_info(skb);
+ if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
+ ip_tunnel_info_af(tun_info) != AF_INET6))
+ return -1;
+ key = &tun_info->key;
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_IPV6;
+ fl6.saddr = key->u.ipv6.src;
+ fl6.daddr = key->u.ipv6.dst;
+ fl6.flowlabel = key->label;
+ dsfield = key->tos;
+ } else {
+ offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
+ /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
+ ipv6h = ipv6_hdr(skb);
+ if (offset > 0) {
+ struct ipv6_tlv_tnl_enc_lim *tel;
+
+ tel = (void *)&skb_network_header(skb)[offset];
+ if (tel->encap_limit == 0) {
+ icmpv6_send(skb, ICMPV6_PARAMPROB,
+ ICMPV6_HDR_FIELD, offset + 2);
+ return -1;
+ }
+ encap_limit = tel->encap_limit - 1;
+ } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
+ encap_limit = t->parms.encap_limit;
+ }
+
+ memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_IPV6;
+
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
+ dsfield = ipv6_get_dsfield(ipv6h);
+ else
+ dsfield = ip6_tclass(t->parms.flowinfo);
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
+ fl6.flowlabel |= ip6_flowlabel(ipv6h);
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
+ fl6.flowi6_mark = skb->mark;
+ else
+ fl6.flowi6_mark = t->parms.fwmark;
+ }
+
+ fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
+
+ if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
+ return -1;
+
+ dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h));
+
+ skb_set_inner_ipproto(skb, IPPROTO_IPV6);
+
+ err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
+ IPPROTO_IPV6);
+ if (err != 0) {
+ if (err == -EMSGSIZE)
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ return -1;
+ }
+
+ return 0;
+}
+
+static netdev_tx_t
+ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net_device_stats *stats = &t->dev->stats;
+ int ret;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ ret = ip4ip6_tnl_xmit(skb, dev);
+ break;
+ case htons(ETH_P_IPV6):
+ ret = ip6ip6_tnl_xmit(skb, dev);
+ break;
+ default:
+ goto tx_err;
+ }
+
+ if (ret < 0)
+ goto tx_err;
+
+ return NETDEV_TX_OK;
+
+tx_err:
+ stats->tx_errors++;
+ stats->tx_dropped++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static void ip6_tnl_link_config(struct ip6_tnl *t)
+{
+ struct net_device *dev = t->dev;
+ struct __ip6_tnl_parm *p = &t->parms;
+ struct flowi6 *fl6 = &t->fl.u.ip6;
+ int t_hlen;
+
+ memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
+ memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
+
+ /* Set up flowi template */
+ fl6->saddr = p->laddr;
+ fl6->daddr = p->raddr;
+ fl6->flowi6_oif = p->link;
+ fl6->flowlabel = 0;
+
+ if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
+ fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
+ if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
+ fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
+
+ p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
+ p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
+
+ if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
+ dev->flags |= IFF_POINTOPOINT;
+ else
+ dev->flags &= ~IFF_POINTOPOINT;
+
+ t->tun_hlen = 0;
+ t->hlen = t->encap_hlen + t->tun_hlen;
+ t_hlen = t->hlen + sizeof(struct ipv6hdr);
+
+ if (p->flags & IP6_TNL_F_CAP_XMIT) {
+ int strict = (ipv6_addr_type(&p->raddr) &
+ (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
+
+ struct rt6_info *rt = rt6_lookup(t->net,
+ &p->raddr, &p->laddr,
+ p->link, NULL, strict);
+
+ if (!rt)
+ return;
+
+ if (rt->dst.dev) {
+ dev->hard_header_len = rt->dst.dev->hard_header_len +
+ t_hlen;
+
+ dev->mtu = rt->dst.dev->mtu - t_hlen;
+ if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ dev->mtu -= 8;
+
+ if (dev->mtu < IPV6_MIN_MTU)
+ dev->mtu = IPV6_MIN_MTU;
+ }
+ ip6_rt_put(rt);
+ }
+}
+
+/**
+ * ip6_tnl_change - update the tunnel parameters
+ * @t: tunnel to be changed
+ * @p: tunnel configuration parameters
+ *
+ * Description:
+ * ip6_tnl_change() updates the tunnel parameters
+ **/
+
+static int
+ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
+{
+ t->parms.laddr = p->laddr;
+ t->parms.raddr = p->raddr;
+ t->parms.flags = p->flags;
+ t->parms.hop_limit = p->hop_limit;
+ t->parms.encap_limit = p->encap_limit;
+ t->parms.flowinfo = p->flowinfo;
+ t->parms.link = p->link;
+ t->parms.proto = p->proto;
+ t->parms.fwmark = p->fwmark;
+ dst_cache_reset(&t->dst_cache);
+ ip6_tnl_link_config(t);
+ return 0;
+}
+
+static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
+{
+ struct net *net = t->net;
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+ int err;
+
+ ip6_tnl_unlink(ip6n, t);
+ synchronize_net();
+ err = ip6_tnl_change(t, p);
+ ip6_tnl_link(ip6n, t);
+ netdev_state_change(t->dev);
+ return err;
+}
+
+static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
+{
+ /* for default tnl0 device allow to change only the proto */
+ t->parms.proto = p->proto;
+ netdev_state_change(t->dev);
+ return 0;
+}
+
+static void
+ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
+{
+ p->laddr = u->laddr;
+ p->raddr = u->raddr;
+ p->flags = u->flags;
+ p->hop_limit = u->hop_limit;
+ p->encap_limit = u->encap_limit;
+ p->flowinfo = u->flowinfo;
+ p->link = u->link;
+ p->proto = u->proto;
+ memcpy(p->name, u->name, sizeof(u->name));
+}
+
+static void
+ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
+{
+ u->laddr = p->laddr;
+ u->raddr = p->raddr;
+ u->flags = p->flags;
+ u->hop_limit = p->hop_limit;
+ u->encap_limit = p->encap_limit;
+ u->flowinfo = p->flowinfo;
+ u->link = p->link;
+ u->proto = p->proto;
+ memcpy(u->name, p->name, sizeof(u->name));
+}
+
+/**
+ * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
+ * @dev: virtual device associated with tunnel
+ * @ifr: parameters passed from userspace
+ * @cmd: command to be performed
+ *
+ * Description:
+ * ip6_tnl_ioctl() is used for managing IPv6 tunnels
+ * from userspace.
+ *
+ * The possible commands are the following:
+ * %SIOCGETTUNNEL: get tunnel parameters for device
+ * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
+ * %SIOCCHGTUNNEL: change tunnel parameters to those given
+ * %SIOCDELTUNNEL: delete tunnel
+ *
+ * The fallback device "ip6tnl0", created during module
+ * initialization, can be used for creating other tunnel devices.
+ *
+ * Return:
+ * 0 on success,
+ * %-EFAULT if unable to copy data to or from userspace,
+ * %-EPERM if current process hasn't %CAP_NET_ADMIN set
+ * %-EINVAL if passed tunnel parameters are invalid,
+ * %-EEXIST if changing a tunnel's parameters would cause a conflict
+ * %-ENODEV if attempting to change or delete a nonexisting device
+ **/
+
+static int
+ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ int err = 0;
+ struct ip6_tnl_parm p;
+ struct __ip6_tnl_parm p1;
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net *net = t->net;
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ memset(&p1, 0, sizeof(p1));
+
+ switch (cmd) {
+ case SIOCGETTUNNEL:
+ if (dev == ip6n->fb_tnl_dev) {
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
+ err = -EFAULT;
+ break;
+ }
+ ip6_tnl_parm_from_user(&p1, &p);
+ t = ip6_tnl_locate(net, &p1, 0);
+ if (IS_ERR(t))
+ t = netdev_priv(dev);
+ } else {
+ memset(&p, 0, sizeof(p));
+ }
+ ip6_tnl_parm_to_user(&p, &t->parms);
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
+ err = -EFAULT;
+ }
+ break;
+ case SIOCADDTUNNEL:
+ case SIOCCHGTUNNEL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ break;
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ break;
+ err = -EINVAL;
+ if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
+ p.proto != 0)
+ break;
+ ip6_tnl_parm_from_user(&p1, &p);
+ t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
+ if (cmd == SIOCCHGTUNNEL) {
+ if (!IS_ERR(t)) {
+ if (t->dev != dev) {
+ err = -EEXIST;
+ break;
+ }
+ } else
+ t = netdev_priv(dev);
+ if (dev == ip6n->fb_tnl_dev)
+ err = ip6_tnl0_update(t, &p1);
+ else
+ err = ip6_tnl_update(t, &p1);
+ }
+ if (!IS_ERR(t)) {
+ err = 0;
+ ip6_tnl_parm_to_user(&p, &t->parms);
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
+ err = -EFAULT;
+
+ } else {
+ err = PTR_ERR(t);
+ }
+ break;
+ case SIOCDELTUNNEL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ break;
+
+ if (dev == ip6n->fb_tnl_dev) {
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ break;
+ err = -ENOENT;
+ ip6_tnl_parm_from_user(&p1, &p);
+ t = ip6_tnl_locate(net, &p1, 0);
+ if (IS_ERR(t))
+ break;
+ err = -EPERM;
+ if (t->dev == ip6n->fb_tnl_dev)
+ break;
+ dev = t->dev;
+ }
+ err = 0;
+ unregister_netdevice(dev);
+ break;
+ default:
+ err = -EINVAL;
+ }
+ return err;
+}
+
+/**
+ * ip6_tnl_change_mtu - change mtu manually for tunnel device
+ * @dev: virtual device associated with tunnel
+ * @new_mtu: the new mtu
+ *
+ * Return:
+ * 0 on success,
+ * %-EINVAL if mtu too small
+ **/
+
+int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct ip6_tnl *tnl = netdev_priv(dev);
+
+ if (tnl->parms.proto == IPPROTO_IPV6) {
+ if (new_mtu < IPV6_MIN_MTU)
+ return -EINVAL;
+ } else {
+ if (new_mtu < ETH_MIN_MTU)
+ return -EINVAL;
+ }
+ if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
+ if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
+ return -EINVAL;
+ } else {
+ if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
+ return -EINVAL;
+ }
+ dev->mtu = new_mtu;
+ return 0;
+}
+EXPORT_SYMBOL(ip6_tnl_change_mtu);
+
+int ip6_tnl_get_iflink(const struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+
+ return t->parms.link;
+}
+EXPORT_SYMBOL(ip6_tnl_get_iflink);
+
+int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
+ unsigned int num)
+{
+ if (num >= MAX_IPTUN_ENCAP_OPS)
+ return -ERANGE;
+
+ return !cmpxchg((const struct ip6_tnl_encap_ops **)
+ &ip6tun_encaps[num],
+ NULL, ops) ? 0 : -1;
+}
+EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
+
+int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
+ unsigned int num)
+{
+ int ret;
+
+ if (num >= MAX_IPTUN_ENCAP_OPS)
+ return -ERANGE;
+
+ ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
+ &ip6tun_encaps[num],
+ ops, NULL) == ops) ? 0 : -1;
+
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
+
+int ip6_tnl_encap_setup(struct ip6_tnl *t,
+ struct ip_tunnel_encap *ipencap)
+{
+ int hlen;
+
+ memset(&t->encap, 0, sizeof(t->encap));
+
+ hlen = ip6_encap_hlen(ipencap);
+ if (hlen < 0)
+ return hlen;
+
+ t->encap.type = ipencap->type;
+ t->encap.sport = ipencap->sport;
+ t->encap.dport = ipencap->dport;
+ t->encap.flags = ipencap->flags;
+
+ t->encap_hlen = hlen;
+ t->hlen = t->encap_hlen + t->tun_hlen;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
+
+static const struct net_device_ops ip6_tnl_netdev_ops = {
+ .ndo_init = ip6_tnl_dev_init,
+ .ndo_uninit = ip6_tnl_dev_uninit,
+ .ndo_start_xmit = ip6_tnl_start_xmit,
+ .ndo_do_ioctl = ip6_tnl_ioctl,
+ .ndo_change_mtu = ip6_tnl_change_mtu,
+ .ndo_get_stats = ip6_get_stats,
+ .ndo_get_iflink = ip6_tnl_get_iflink,
+};
+
+#define IPXIPX_FEATURES (NETIF_F_SG | \
+ NETIF_F_FRAGLIST | \
+ NETIF_F_HIGHDMA | \
+ NETIF_F_GSO_SOFTWARE | \
+ NETIF_F_HW_CSUM)
+
+/**
+ * ip6_tnl_dev_setup - setup virtual tunnel device
+ * @dev: virtual device associated with tunnel
+ *
+ * Description:
+ * Initialize function pointers and device parameters
+ **/
+
+static void ip6_tnl_dev_setup(struct net_device *dev)
+{
+ dev->netdev_ops = &ip6_tnl_netdev_ops;
+ dev->needs_free_netdev = true;
+ dev->priv_destructor = ip6_dev_free;
+
+ dev->type = ARPHRD_TUNNEL6;
+ dev->flags |= IFF_NOARP;
+ dev->addr_len = sizeof(struct in6_addr);
+ dev->features |= NETIF_F_LLTX;
+ netif_keep_dst(dev);
+
+ dev->features |= IPXIPX_FEATURES;
+ dev->hw_features |= IPXIPX_FEATURES;
+
+ /* This perm addr will be used as interface identifier by IPv6 */
+ dev->addr_assign_type = NET_ADDR_RANDOM;
+ eth_random_addr(dev->perm_addr);
+}
+
+
+/**
+ * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
+ * @dev: virtual device associated with tunnel
+ **/
+
+static inline int
+ip6_tnl_dev_init_gen(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ int ret;
+ int t_hlen;
+
+ t->dev = dev;
+ t->net = dev_net(dev);
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
+ if (ret)
+ goto free_stats;
+
+ ret = gro_cells_init(&t->gro_cells, dev);
+ if (ret)
+ goto destroy_dst;
+
+ t->tun_hlen = 0;
+ t->hlen = t->encap_hlen + t->tun_hlen;
+ t_hlen = t->hlen + sizeof(struct ipv6hdr);
+
+ dev->type = ARPHRD_TUNNEL6;
+ dev->hard_header_len = LL_MAX_HEADER + t_hlen;
+ dev->mtu = ETH_DATA_LEN - t_hlen;
+ if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ dev->mtu -= 8;
+ dev->min_mtu = ETH_MIN_MTU;
+ dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
+
+ return 0;
+
+destroy_dst:
+ dst_cache_destroy(&t->dst_cache);
+free_stats:
+ free_percpu(dev->tstats);
+ dev->tstats = NULL;
+
+ return ret;
+}
+
+/**
+ * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
+ * @dev: virtual device associated with tunnel
+ **/
+
+static int ip6_tnl_dev_init(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ int err = ip6_tnl_dev_init_gen(dev);
+
+ if (err)
+ return err;
+ ip6_tnl_link_config(t);
+ if (t->parms.collect_md) {
+ dev->features |= NETIF_F_NETNS_LOCAL;
+ netif_keep_dst(dev);
+ }
+ return 0;
+}
+
+/**
+ * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
+ * @dev: fallback device
+ *
+ * Return: 0
+ **/
+
+static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net *net = dev_net(dev);
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ t->parms.proto = IPPROTO_IPV6;
+ dev_hold(dev);
+
+ rcu_assign_pointer(ip6n->tnls_wc[0], t);
+ return 0;
+}
+
+static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ u8 proto;
+
+ if (!data || !data[IFLA_IPTUN_PROTO])
+ return 0;
+
+ proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+ if (proto != IPPROTO_IPV6 &&
+ proto != IPPROTO_IPIP &&
+ proto != 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void ip6_tnl_netlink_parms(struct nlattr *data[],
+ struct __ip6_tnl_parm *parms)
+{
+ memset(parms, 0, sizeof(*parms));
+
+ if (!data)
+ return;
+
+ if (data[IFLA_IPTUN_LINK])
+ parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
+
+ if (data[IFLA_IPTUN_LOCAL])
+ parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
+
+ if (data[IFLA_IPTUN_REMOTE])
+ parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
+
+ if (data[IFLA_IPTUN_TTL])
+ parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
+
+ if (data[IFLA_IPTUN_ENCAP_LIMIT])
+ parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
+
+ if (data[IFLA_IPTUN_FLOWINFO])
+ parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
+
+ if (data[IFLA_IPTUN_FLAGS])
+ parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
+
+ if (data[IFLA_IPTUN_PROTO])
+ parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+
+ if (data[IFLA_IPTUN_COLLECT_METADATA])
+ parms->collect_md = true;
+
+ if (data[IFLA_IPTUN_FWMARK])
+ parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
+}
+
+static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
+ struct ip_tunnel_encap *ipencap)
+{
+ bool ret = false;
+
+ memset(ipencap, 0, sizeof(*ipencap));
+
+ if (!data)
+ return ret;
+
+ if (data[IFLA_IPTUN_ENCAP_TYPE]) {
+ ret = true;
+ ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
+ }
+
+ if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
+ ret = true;
+ ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
+ }
+
+ if (data[IFLA_IPTUN_ENCAP_SPORT]) {
+ ret = true;
+ ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
+ }
+
+ if (data[IFLA_IPTUN_ENCAP_DPORT]) {
+ ret = true;
+ ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
+ }
+
+ return ret;
+}
+
+static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = dev_net(dev);
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+ struct ip_tunnel_encap ipencap;
+ struct ip6_tnl *nt, *t;
+ int err;
+
+ nt = netdev_priv(dev);
+
+ if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
+ err = ip6_tnl_encap_setup(nt, &ipencap);
+ if (err < 0)
+ return err;
+ }
+
+ ip6_tnl_netlink_parms(data, &nt->parms);
+
+ if (nt->parms.collect_md) {
+ if (rtnl_dereference(ip6n->collect_md_tun))
+ return -EEXIST;
+ } else {
+ t = ip6_tnl_locate(net, &nt->parms, 0);
+ if (!IS_ERR(t))
+ return -EEXIST;
+ }
+
+ err = ip6_tnl_create2(dev);
+ if (!err && tb[IFLA_MTU])
+ ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
+
+ return err;
+}
+
+static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct __ip6_tnl_parm p;
+ struct net *net = t->net;
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+ struct ip_tunnel_encap ipencap;
+
+ if (dev == ip6n->fb_tnl_dev)
+ return -EINVAL;
+
+ if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
+ int err = ip6_tnl_encap_setup(t, &ipencap);
+
+ if (err < 0)
+ return err;
+ }
+ ip6_tnl_netlink_parms(data, &p);
+ if (p.collect_md)
+ return -EINVAL;
+
+ t = ip6_tnl_locate(net, &p, 0);
+ if (!IS_ERR(t)) {
+ if (t->dev != dev)
+ return -EEXIST;
+ } else
+ t = netdev_priv(dev);
+
+ return ip6_tnl_update(t, &p);
+}
+
+static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct net *net = dev_net(dev);
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ if (dev != ip6n->fb_tnl_dev)
+ unregister_netdevice_queue(dev, head);
+}
+
+static size_t ip6_tnl_get_size(const struct net_device *dev)
+{
+ return
+ /* IFLA_IPTUN_LINK */
+ nla_total_size(4) +
+ /* IFLA_IPTUN_LOCAL */
+ nla_total_size(sizeof(struct in6_addr)) +
+ /* IFLA_IPTUN_REMOTE */
+ nla_total_size(sizeof(struct in6_addr)) +
+ /* IFLA_IPTUN_TTL */
+ nla_total_size(1) +
+ /* IFLA_IPTUN_ENCAP_LIMIT */
+ nla_total_size(1) +
+ /* IFLA_IPTUN_FLOWINFO */
+ nla_total_size(4) +
+ /* IFLA_IPTUN_FLAGS */
+ nla_total_size(4) +
+ /* IFLA_IPTUN_PROTO */
+ nla_total_size(1) +
+ /* IFLA_IPTUN_ENCAP_TYPE */
+ nla_total_size(2) +
+ /* IFLA_IPTUN_ENCAP_FLAGS */
+ nla_total_size(2) +
+ /* IFLA_IPTUN_ENCAP_SPORT */
+ nla_total_size(2) +
+ /* IFLA_IPTUN_ENCAP_DPORT */
+ nla_total_size(2) +
+ /* IFLA_IPTUN_COLLECT_METADATA */
+ nla_total_size(0) +
+ /* IFLA_IPTUN_FWMARK */
+ nla_total_size(4) +
+ 0;
+}
+
+static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ struct ip6_tnl *tunnel = netdev_priv(dev);
+ struct __ip6_tnl_parm *parm = &tunnel->parms;
+
+ if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
+ nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
+ nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
+ nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
+ nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
+ nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
+ nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
+ nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
+ nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
+ goto nla_put_failure;
+
+ if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
+ nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
+ nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
+ nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
+ goto nla_put_failure;
+
+ if (parm->collect_md)
+ if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+struct net *ip6_tnl_get_link_net(const struct net_device *dev)
+{
+ struct ip6_tnl *tunnel = netdev_priv(dev);
+
+ return tunnel->net;
+}
+EXPORT_SYMBOL(ip6_tnl_get_link_net);
+
+static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
+ [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
+ [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
+ [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
+ [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
+ [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
+ [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
+ [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
+ [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
+ [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
+ [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
+ [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
+ [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
+ [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
+ [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
+};
+
+static struct rtnl_link_ops ip6_link_ops __read_mostly = {
+ .kind = "ip6tnl",
+ .maxtype = IFLA_IPTUN_MAX,
+ .policy = ip6_tnl_policy,
+ .priv_size = sizeof(struct ip6_tnl),
+ .setup = ip6_tnl_dev_setup,
+ .validate = ip6_tnl_validate,
+ .newlink = ip6_tnl_newlink,
+ .changelink = ip6_tnl_changelink,
+ .dellink = ip6_tnl_dellink,
+ .get_size = ip6_tnl_get_size,
+ .fill_info = ip6_tnl_fill_info,
+ .get_link_net = ip6_tnl_get_link_net,
+};
+
+static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
+ .handler = ip4ip6_rcv,
+ .err_handler = ip4ip6_err,
+ .priority = 1,
+};
+
+static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
+ .handler = ip6ip6_rcv,
+ .err_handler = ip6ip6_err,
+ .priority = 1,
+};
+
+static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
+{
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+ struct net_device *dev, *aux;
+ int h;
+ struct ip6_tnl *t;
+
+ for_each_netdev_safe(net, dev, aux)
+ if (dev->rtnl_link_ops == &ip6_link_ops)
+ unregister_netdevice_queue(dev, list);
+
+ for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
+ t = rtnl_dereference(ip6n->tnls_r_l[h]);
+ while (t) {
+ /* If dev is in the same netns, it has already
+ * been added to the list by the previous loop.
+ */
+ if (!net_eq(dev_net(t->dev), net))
+ unregister_netdevice_queue(t->dev, list);
+ t = rtnl_dereference(t->next);
+ }
+ }
+}
+
+static int __net_init ip6_tnl_init_net(struct net *net)
+{
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+ struct ip6_tnl *t = NULL;
+ int err;
+
+ ip6n->tnls[0] = ip6n->tnls_wc;
+ ip6n->tnls[1] = ip6n->tnls_r_l;
+
+ if (!net_has_fallback_tunnels(net))
+ return 0;
+ err = -ENOMEM;
+ ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
+ NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
+
+ if (!ip6n->fb_tnl_dev)
+ goto err_alloc_dev;
+ dev_net_set(ip6n->fb_tnl_dev, net);
+ ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
+ /* FB netdevice is special: we have one, and only one per netns.
+ * Allowing to move it to another netns is clearly unsafe.
+ */
+ ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
+
+ err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
+ if (err < 0)
+ goto err_register;
+
+ err = register_netdev(ip6n->fb_tnl_dev);
+ if (err < 0)
+ goto err_register;
+
+ t = netdev_priv(ip6n->fb_tnl_dev);
+
+ strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
+ return 0;
+
+err_register:
+ free_netdev(ip6n->fb_tnl_dev);
+err_alloc_dev:
+ return err;
+}
+
+static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
+{
+ struct net *net;
+ LIST_HEAD(list);
+
+ rtnl_lock();
+ list_for_each_entry(net, net_list, exit_list)
+ ip6_tnl_destroy_tunnels(net, &list);
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+}
+
+static struct pernet_operations ip6_tnl_net_ops = {
+ .init = ip6_tnl_init_net,
+ .exit_batch = ip6_tnl_exit_batch_net,
+ .id = &ip6_tnl_net_id,
+ .size = sizeof(struct ip6_tnl_net),
+};
+
+/**
+ * ip6_tunnel_init - register protocol and reserve needed resources
+ *
+ * Return: 0 on success
+ **/
+
+static int __init ip6_tunnel_init(void)
+{
+ int err;
+
+ if (!ipv6_mod_enabled())
+ return -EOPNOTSUPP;
+
+ err = register_pernet_device(&ip6_tnl_net_ops);
+ if (err < 0)
+ goto out_pernet;
+
+ err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
+ if (err < 0) {
+ pr_err("%s: can't register ip4ip6\n", __func__);
+ goto out_ip4ip6;
+ }
+
+ err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
+ if (err < 0) {
+ pr_err("%s: can't register ip6ip6\n", __func__);
+ goto out_ip6ip6;
+ }
+ err = rtnl_link_register(&ip6_link_ops);
+ if (err < 0)
+ goto rtnl_link_failed;
+
+ return 0;
+
+rtnl_link_failed:
+ xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
+out_ip6ip6:
+ xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
+out_ip4ip6:
+ unregister_pernet_device(&ip6_tnl_net_ops);
+out_pernet:
+ return err;
+}
+
+/**
+ * ip6_tunnel_cleanup - free resources and unregister protocol
+ **/
+
+static void __exit ip6_tunnel_cleanup(void)
+{
+ rtnl_link_unregister(&ip6_link_ops);
+ if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
+ pr_info("%s: can't deregister ip4ip6\n", __func__);
+
+ if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
+ pr_info("%s: can't deregister ip6ip6\n", __func__);
+
+ unregister_pernet_device(&ip6_tnl_net_ops);
+}
+
+module_init(ip6_tunnel_init);
+module_exit(ip6_tunnel_cleanup);
diff --git a/net/ipv6/ip6_udp_tunnel.c b/net/ipv6/ip6_udp_tunnel.c
new file mode 100644
index 0000000..b283f29
--- /dev/null
+++ b/net/ipv6/ip6_udp_tunnel.c
@@ -0,0 +1,110 @@
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/socket.h>
+#include <linux/udp.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/in6.h>
+#include <net/udp.h>
+#include <net/udp_tunnel.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/ip6_tunnel.h>
+#include <net/ip6_checksum.h>
+
+int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
+ struct socket **sockp)
+{
+ struct sockaddr_in6 udp6_addr;
+ int err;
+ struct socket *sock = NULL;
+
+ err = sock_create_kern(net, AF_INET6, SOCK_DGRAM, 0, &sock);
+ if (err < 0)
+ goto error;
+
+ if (cfg->ipv6_v6only) {
+ int val = 1;
+
+ err = kernel_setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
+ (char *) &val, sizeof(val));
+ if (err < 0)
+ goto error;
+ }
+
+ udp6_addr.sin6_family = AF_INET6;
+ memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
+ sizeof(udp6_addr.sin6_addr));
+ udp6_addr.sin6_port = cfg->local_udp_port;
+ err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
+ sizeof(udp6_addr));
+ if (err < 0)
+ goto error;
+
+ if (cfg->peer_udp_port) {
+ udp6_addr.sin6_family = AF_INET6;
+ memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
+ sizeof(udp6_addr.sin6_addr));
+ udp6_addr.sin6_port = cfg->peer_udp_port;
+ err = kernel_connect(sock,
+ (struct sockaddr *)&udp6_addr,
+ sizeof(udp6_addr), 0);
+ }
+ if (err < 0)
+ goto error;
+
+ udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
+ udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
+
+ *sockp = sock;
+ return 0;
+
+error:
+ if (sock) {
+ kernel_sock_shutdown(sock, SHUT_RDWR);
+ sock_release(sock);
+ }
+ *sockp = NULL;
+ return err;
+}
+EXPORT_SYMBOL_GPL(udp_sock_create6);
+
+int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb,
+ struct net_device *dev, struct in6_addr *saddr,
+ struct in6_addr *daddr,
+ __u8 prio, __u8 ttl, __be32 label,
+ __be16 src_port, __be16 dst_port, bool nocheck)
+{
+ struct udphdr *uh;
+ struct ipv6hdr *ip6h;
+
+ __skb_push(skb, sizeof(*uh));
+ skb_reset_transport_header(skb);
+ uh = udp_hdr(skb);
+
+ uh->dest = dst_port;
+ uh->source = src_port;
+
+ uh->len = htons(skb->len);
+
+ skb_dst_set(skb, dst);
+
+ udp6_set_csum(nocheck, skb, saddr, daddr, skb->len);
+
+ __skb_push(skb, sizeof(*ip6h));
+ skb_reset_network_header(skb);
+ ip6h = ipv6_hdr(skb);
+ ip6_flow_hdr(ip6h, prio, label);
+ ip6h->payload_len = htons(skb->len);
+ ip6h->nexthdr = IPPROTO_UDP;
+ ip6h->hop_limit = ttl;
+ ip6h->daddr = *daddr;
+ ip6h->saddr = *saddr;
+
+ ip6tunnel_xmit(sk, skb, dev);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
+
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
new file mode 100644
index 0000000..eeaf745
--- /dev/null
+++ b/net/ipv6/ip6_vti.c
@@ -0,0 +1,1247 @@
+/*
+ * IPv6 virtual tunneling interface
+ *
+ * Copyright (C) 2013 secunet Security Networks AG
+ *
+ * Author:
+ * Steffen Klassert <steffen.klassert@secunet.com>
+ *
+ * Based on:
+ * net/ipv6/ip6_tunnel.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/sockios.h>
+#include <linux/icmp.h>
+#include <linux/if.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/icmpv6.h>
+#include <linux/init.h>
+#include <linux/route.h>
+#include <linux/rtnetlink.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/slab.h>
+#include <linux/hash.h>
+
+#include <linux/uaccess.h>
+#include <linux/atomic.h>
+
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/ip6_tunnel.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <linux/etherdevice.h>
+
+#define IP6_VTI_HASH_SIZE_SHIFT 5
+#define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
+
+static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
+{
+ u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
+
+ return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
+}
+
+static int vti6_dev_init(struct net_device *dev);
+static void vti6_dev_setup(struct net_device *dev);
+static struct rtnl_link_ops vti6_link_ops __read_mostly;
+
+static unsigned int vti6_net_id __read_mostly;
+struct vti6_net {
+ /* the vti6 tunnel fallback device */
+ struct net_device *fb_tnl_dev;
+ /* lists for storing tunnels in use */
+ struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
+ struct ip6_tnl __rcu *tnls_wc[1];
+ struct ip6_tnl __rcu **tnls[2];
+};
+
+#define for_each_vti6_tunnel_rcu(start) \
+ for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
+
+/**
+ * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
+ * @net: network namespace
+ * @remote: the address of the tunnel exit-point
+ * @local: the address of the tunnel entry-point
+ *
+ * Return:
+ * tunnel matching given end-points if found,
+ * else fallback tunnel if its device is up,
+ * else %NULL
+ **/
+static struct ip6_tnl *
+vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
+ const struct in6_addr *local)
+{
+ unsigned int hash = HASH(remote, local);
+ struct ip6_tnl *t;
+ struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+ struct in6_addr any;
+
+ for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
+ if (ipv6_addr_equal(local, &t->parms.laddr) &&
+ ipv6_addr_equal(remote, &t->parms.raddr) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+
+ memset(&any, 0, sizeof(any));
+ hash = HASH(&any, local);
+ for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
+ if (ipv6_addr_equal(local, &t->parms.laddr) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+
+ hash = HASH(remote, &any);
+ for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
+ if (ipv6_addr_equal(remote, &t->parms.raddr) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+
+ t = rcu_dereference(ip6n->tnls_wc[0]);
+ if (t && (t->dev->flags & IFF_UP))
+ return t;
+
+ return NULL;
+}
+
+/**
+ * vti6_tnl_bucket - get head of list matching given tunnel parameters
+ * @p: parameters containing tunnel end-points
+ *
+ * Description:
+ * vti6_tnl_bucket() returns the head of the list matching the
+ * &struct in6_addr entries laddr and raddr in @p.
+ *
+ * Return: head of IPv6 tunnel list
+ **/
+static struct ip6_tnl __rcu **
+vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
+{
+ const struct in6_addr *remote = &p->raddr;
+ const struct in6_addr *local = &p->laddr;
+ unsigned int h = 0;
+ int prio = 0;
+
+ if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
+ prio = 1;
+ h = HASH(remote, local);
+ }
+ return &ip6n->tnls[prio][h];
+}
+
+static void
+vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
+{
+ struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
+
+ rcu_assign_pointer(t->next , rtnl_dereference(*tp));
+ rcu_assign_pointer(*tp, t);
+}
+
+static void
+vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
+{
+ struct ip6_tnl __rcu **tp;
+ struct ip6_tnl *iter;
+
+ for (tp = vti6_tnl_bucket(ip6n, &t->parms);
+ (iter = rtnl_dereference(*tp)) != NULL;
+ tp = &iter->next) {
+ if (t == iter) {
+ rcu_assign_pointer(*tp, t->next);
+ break;
+ }
+ }
+}
+
+static void vti6_dev_free(struct net_device *dev)
+{
+ free_percpu(dev->tstats);
+}
+
+static int vti6_tnl_create2(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net *net = dev_net(dev);
+ struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+ int err;
+
+ dev->rtnl_link_ops = &vti6_link_ops;
+ err = register_netdevice(dev);
+ if (err < 0)
+ goto out;
+
+ strcpy(t->parms.name, dev->name);
+
+ dev_hold(dev);
+ vti6_tnl_link(ip6n, t);
+
+ return 0;
+
+out:
+ return err;
+}
+
+static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
+{
+ struct net_device *dev;
+ struct ip6_tnl *t;
+ char name[IFNAMSIZ];
+ int err;
+
+ if (p->name[0]) {
+ if (!dev_valid_name(p->name))
+ goto failed;
+ strlcpy(name, p->name, IFNAMSIZ);
+ } else {
+ sprintf(name, "ip6_vti%%d");
+ }
+
+ dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
+ if (!dev)
+ goto failed;
+
+ dev_net_set(dev, net);
+
+ t = netdev_priv(dev);
+ t->parms = *p;
+ t->net = dev_net(dev);
+
+ err = vti6_tnl_create2(dev);
+ if (err < 0)
+ goto failed_free;
+
+ return t;
+
+failed_free:
+ free_netdev(dev);
+failed:
+ return NULL;
+}
+
+/**
+ * vti6_locate - find or create tunnel matching given parameters
+ * @net: network namespace
+ * @p: tunnel parameters
+ * @create: != 0 if allowed to create new tunnel if no match found
+ *
+ * Description:
+ * vti6_locate() first tries to locate an existing tunnel
+ * based on @parms. If this is unsuccessful, but @create is set a new
+ * tunnel device is created and registered for use.
+ *
+ * Return:
+ * matching tunnel or NULL
+ **/
+static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
+ int create)
+{
+ const struct in6_addr *remote = &p->raddr;
+ const struct in6_addr *local = &p->laddr;
+ struct ip6_tnl __rcu **tp;
+ struct ip6_tnl *t;
+ struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+
+ for (tp = vti6_tnl_bucket(ip6n, p);
+ (t = rtnl_dereference(*tp)) != NULL;
+ tp = &t->next) {
+ if (ipv6_addr_equal(local, &t->parms.laddr) &&
+ ipv6_addr_equal(remote, &t->parms.raddr)) {
+ if (create)
+ return NULL;
+
+ return t;
+ }
+ }
+ if (!create)
+ return NULL;
+ return vti6_tnl_create(net, p);
+}
+
+/**
+ * vti6_dev_uninit - tunnel device uninitializer
+ * @dev: the device to be destroyed
+ *
+ * Description:
+ * vti6_dev_uninit() removes tunnel from its list
+ **/
+static void vti6_dev_uninit(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
+
+ if (dev == ip6n->fb_tnl_dev)
+ RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
+ else
+ vti6_tnl_unlink(ip6n, t);
+ dev_put(dev);
+}
+
+static int vti6_rcv(struct sk_buff *skb)
+{
+ struct ip6_tnl *t;
+ const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+
+ rcu_read_lock();
+ t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
+ if (t) {
+ if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
+ rcu_read_unlock();
+ goto discard;
+ }
+
+ if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
+ rcu_read_unlock();
+ return 0;
+ }
+
+ if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
+ t->dev->stats.rx_dropped++;
+ rcu_read_unlock();
+ goto discard;
+ }
+
+ rcu_read_unlock();
+
+ return xfrm6_rcv_tnl(skb, t);
+ }
+ rcu_read_unlock();
+ return -EINVAL;
+discard:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int vti6_rcv_cb(struct sk_buff *skb, int err)
+{
+ unsigned short family;
+ struct net_device *dev;
+ struct pcpu_sw_netstats *tstats;
+ struct xfrm_state *x;
+ struct xfrm_mode *inner_mode;
+ struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
+ u32 orig_mark = skb->mark;
+ int ret;
+
+ if (!t)
+ return 1;
+
+ dev = t->dev;
+
+ if (err) {
+ dev->stats.rx_errors++;
+ dev->stats.rx_dropped++;
+
+ return 0;
+ }
+
+ x = xfrm_input_state(skb);
+
+ inner_mode = x->inner_mode;
+
+ if (x->sel.family == AF_UNSPEC) {
+ inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
+ if (inner_mode == NULL) {
+ XFRM_INC_STATS(dev_net(skb->dev),
+ LINUX_MIB_XFRMINSTATEMODEERROR);
+ return -EINVAL;
+ }
+ }
+
+ family = inner_mode->afinfo->family;
+
+ skb->mark = be32_to_cpu(t->parms.i_key);
+ ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
+ skb->mark = orig_mark;
+
+ if (!ret)
+ return -EPERM;
+
+ skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
+ skb->dev = dev;
+
+ tstats = this_cpu_ptr(dev->tstats);
+ u64_stats_update_begin(&tstats->syncp);
+ tstats->rx_packets++;
+ tstats->rx_bytes += skb->len;
+ u64_stats_update_end(&tstats->syncp);
+
+ return 0;
+}
+
+/**
+ * vti6_addr_conflict - compare packet addresses to tunnel's own
+ * @t: the outgoing tunnel device
+ * @hdr: IPv6 header from the incoming packet
+ *
+ * Description:
+ * Avoid trivial tunneling loop by checking that tunnel exit-point
+ * doesn't match source of incoming packet.
+ *
+ * Return:
+ * 1 if conflict,
+ * 0 else
+ **/
+static inline bool
+vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
+{
+ return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
+}
+
+static bool vti6_state_check(const struct xfrm_state *x,
+ const struct in6_addr *dst,
+ const struct in6_addr *src)
+{
+ xfrm_address_t *daddr = (xfrm_address_t *)dst;
+ xfrm_address_t *saddr = (xfrm_address_t *)src;
+
+ /* if there is no transform then this tunnel is not functional.
+ * Or if the xfrm is not mode tunnel.
+ */
+ if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
+ x->props.family != AF_INET6)
+ return false;
+
+ if (ipv6_addr_any(dst))
+ return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
+
+ if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
+ return false;
+
+ return true;
+}
+
+/**
+ * vti6_xmit - send a packet
+ * @skb: the outgoing socket buffer
+ * @dev: the outgoing tunnel device
+ * @fl: the flow informations for the xfrm_lookup
+ **/
+static int
+vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net_device_stats *stats = &t->dev->stats;
+ struct dst_entry *dst = skb_dst(skb);
+ struct net_device *tdev;
+ struct xfrm_state *x;
+ int pkt_len = skb->len;
+ int err = -1;
+ int mtu;
+
+ if (!dst)
+ goto tx_err_link_failure;
+
+ dst_hold(dst);
+ dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ dst = NULL;
+ goto tx_err_link_failure;
+ }
+
+ x = dst->xfrm;
+ if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
+ goto tx_err_link_failure;
+
+ if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
+ (const struct in6_addr *)&x->id.daddr))
+ goto tx_err_link_failure;
+
+ tdev = dst->dev;
+
+ if (tdev == dev) {
+ stats->collisions++;
+ net_warn_ratelimited("%s: Local routing loop detected!\n",
+ t->parms.name);
+ goto tx_err_dst_release;
+ }
+
+ mtu = dst_mtu(dst);
+ if (skb->len > mtu) {
+ skb_dst_update_pmtu(skb, mtu);
+
+ if (skb->protocol == htons(ETH_P_IPV6)) {
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
+
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ } else {
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+ htonl(mtu));
+ }
+
+ err = -EMSGSIZE;
+ goto tx_err_dst_release;
+ }
+
+ skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
+ skb_dst_set(skb, dst);
+ skb->dev = skb_dst(skb)->dev;
+
+ err = dst_output(t->net, skb->sk, skb);
+ if (net_xmit_eval(err) == 0)
+ err = pkt_len;
+ iptunnel_xmit_stats(dev, err);
+
+ return 0;
+tx_err_link_failure:
+ stats->tx_carrier_errors++;
+ dst_link_failure(skb);
+tx_err_dst_release:
+ dst_release(dst);
+ return err;
+}
+
+static netdev_tx_t
+vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net_device_stats *stats = &t->dev->stats;
+ struct ipv6hdr *ipv6h;
+ struct flowi fl;
+ int ret;
+
+ memset(&fl, 0, sizeof(fl));
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IPV6):
+ ipv6h = ipv6_hdr(skb);
+
+ if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
+ vti6_addr_conflict(t, ipv6h))
+ goto tx_err;
+
+ xfrm_decode_session(skb, &fl, AF_INET6);
+ memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
+ break;
+ case htons(ETH_P_IP):
+ xfrm_decode_session(skb, &fl, AF_INET);
+ memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+ break;
+ default:
+ goto tx_err;
+ }
+
+ /* override mark with tunnel output key */
+ fl.flowi_mark = be32_to_cpu(t->parms.o_key);
+
+ ret = vti6_xmit(skb, dev, &fl);
+ if (ret < 0)
+ goto tx_err;
+
+ return NETDEV_TX_OK;
+
+tx_err:
+ stats->tx_errors++;
+ stats->tx_dropped++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ __be32 spi;
+ __u32 mark;
+ struct xfrm_state *x;
+ struct ip6_tnl *t;
+ struct ip_esp_hdr *esph;
+ struct ip_auth_hdr *ah;
+ struct ip_comp_hdr *ipch;
+ struct net *net = dev_net(skb->dev);
+ const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
+ int protocol = iph->nexthdr;
+
+ t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
+ if (!t)
+ return -1;
+
+ mark = be32_to_cpu(t->parms.o_key);
+
+ switch (protocol) {
+ case IPPROTO_ESP:
+ esph = (struct ip_esp_hdr *)(skb->data + offset);
+ spi = esph->spi;
+ break;
+ case IPPROTO_AH:
+ ah = (struct ip_auth_hdr *)(skb->data + offset);
+ spi = ah->spi;
+ break;
+ case IPPROTO_COMP:
+ ipch = (struct ip_comp_hdr *)(skb->data + offset);
+ spi = htonl(ntohs(ipch->cpi));
+ break;
+ default:
+ return 0;
+ }
+
+ if (type != ICMPV6_PKT_TOOBIG &&
+ type != NDISC_REDIRECT)
+ return 0;
+
+ x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
+ spi, protocol, AF_INET6);
+ if (!x)
+ return 0;
+
+ if (type == NDISC_REDIRECT)
+ ip6_redirect(skb, net, skb->dev->ifindex, 0,
+ sock_net_uid(net, NULL));
+ else
+ ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
+ xfrm_state_put(x);
+
+ return 0;
+}
+
+static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
+{
+ struct net_device *dev = t->dev;
+ struct __ip6_tnl_parm *p = &t->parms;
+ struct net_device *tdev = NULL;
+ int mtu;
+
+ memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
+ memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
+
+ p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
+ IP6_TNL_F_CAP_PER_PACKET);
+ p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
+
+ if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
+ dev->flags |= IFF_POINTOPOINT;
+ else
+ dev->flags &= ~IFF_POINTOPOINT;
+
+ if (keep_mtu && dev->mtu) {
+ dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
+ return;
+ }
+
+ if (p->flags & IP6_TNL_F_CAP_XMIT) {
+ int strict = (ipv6_addr_type(&p->raddr) &
+ (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
+ struct rt6_info *rt = rt6_lookup(t->net,
+ &p->raddr, &p->laddr,
+ p->link, NULL, strict);
+
+ if (rt)
+ tdev = rt->dst.dev;
+ ip6_rt_put(rt);
+ }
+
+ if (!tdev && p->link)
+ tdev = __dev_get_by_index(t->net, p->link);
+
+ if (tdev)
+ mtu = tdev->mtu - sizeof(struct ipv6hdr);
+ else
+ mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
+
+ dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
+}
+
+/**
+ * vti6_tnl_change - update the tunnel parameters
+ * @t: tunnel to be changed
+ * @p: tunnel configuration parameters
+ * @keep_mtu: MTU was set from userspace, don't re-compute it
+ *
+ * Description:
+ * vti6_tnl_change() updates the tunnel parameters
+ **/
+static int
+vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
+ bool keep_mtu)
+{
+ t->parms.laddr = p->laddr;
+ t->parms.raddr = p->raddr;
+ t->parms.link = p->link;
+ t->parms.i_key = p->i_key;
+ t->parms.o_key = p->o_key;
+ t->parms.proto = p->proto;
+ t->parms.fwmark = p->fwmark;
+ dst_cache_reset(&t->dst_cache);
+ vti6_link_config(t, keep_mtu);
+ return 0;
+}
+
+static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
+ bool keep_mtu)
+{
+ struct net *net = dev_net(t->dev);
+ struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+ int err;
+
+ vti6_tnl_unlink(ip6n, t);
+ synchronize_net();
+ err = vti6_tnl_change(t, p, keep_mtu);
+ vti6_tnl_link(ip6n, t);
+ netdev_state_change(t->dev);
+ return err;
+}
+
+static void
+vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
+{
+ p->laddr = u->laddr;
+ p->raddr = u->raddr;
+ p->link = u->link;
+ p->i_key = u->i_key;
+ p->o_key = u->o_key;
+ p->proto = u->proto;
+
+ memcpy(p->name, u->name, sizeof(u->name));
+}
+
+static void
+vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
+{
+ u->laddr = p->laddr;
+ u->raddr = p->raddr;
+ u->link = p->link;
+ u->i_key = p->i_key;
+ u->o_key = p->o_key;
+ if (u->i_key)
+ u->i_flags |= GRE_KEY;
+ if (u->o_key)
+ u->o_flags |= GRE_KEY;
+ u->proto = p->proto;
+
+ memcpy(u->name, p->name, sizeof(u->name));
+}
+
+/**
+ * vti6_ioctl - configure vti6 tunnels from userspace
+ * @dev: virtual device associated with tunnel
+ * @ifr: parameters passed from userspace
+ * @cmd: command to be performed
+ *
+ * Description:
+ * vti6_ioctl() is used for managing vti6 tunnels
+ * from userspace.
+ *
+ * The possible commands are the following:
+ * %SIOCGETTUNNEL: get tunnel parameters for device
+ * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
+ * %SIOCCHGTUNNEL: change tunnel parameters to those given
+ * %SIOCDELTUNNEL: delete tunnel
+ *
+ * The fallback device "ip6_vti0", created during module
+ * initialization, can be used for creating other tunnel devices.
+ *
+ * Return:
+ * 0 on success,
+ * %-EFAULT if unable to copy data to or from userspace,
+ * %-EPERM if current process hasn't %CAP_NET_ADMIN set
+ * %-EINVAL if passed tunnel parameters are invalid,
+ * %-EEXIST if changing a tunnel's parameters would cause a conflict
+ * %-ENODEV if attempting to change or delete a nonexisting device
+ **/
+static int
+vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ int err = 0;
+ struct ip6_tnl_parm2 p;
+ struct __ip6_tnl_parm p1;
+ struct ip6_tnl *t = NULL;
+ struct net *net = dev_net(dev);
+ struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+
+ switch (cmd) {
+ case SIOCGETTUNNEL:
+ if (dev == ip6n->fb_tnl_dev) {
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
+ err = -EFAULT;
+ break;
+ }
+ vti6_parm_from_user(&p1, &p);
+ t = vti6_locate(net, &p1, 0);
+ } else {
+ memset(&p, 0, sizeof(p));
+ }
+ if (!t)
+ t = netdev_priv(dev);
+ vti6_parm_to_user(&p, &t->parms);
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
+ err = -EFAULT;
+ break;
+ case SIOCADDTUNNEL:
+ case SIOCCHGTUNNEL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ break;
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ break;
+ err = -EINVAL;
+ if (p.proto != IPPROTO_IPV6 && p.proto != 0)
+ break;
+ vti6_parm_from_user(&p1, &p);
+ t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
+ if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
+ if (t) {
+ if (t->dev != dev) {
+ err = -EEXIST;
+ break;
+ }
+ } else
+ t = netdev_priv(dev);
+
+ err = vti6_update(t, &p1, false);
+ }
+ if (t) {
+ err = 0;
+ vti6_parm_to_user(&p, &t->parms);
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
+ err = -EFAULT;
+
+ } else
+ err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
+ break;
+ case SIOCDELTUNNEL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ break;
+
+ if (dev == ip6n->fb_tnl_dev) {
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ break;
+ err = -ENOENT;
+ vti6_parm_from_user(&p1, &p);
+ t = vti6_locate(net, &p1, 0);
+ if (!t)
+ break;
+ err = -EPERM;
+ if (t->dev == ip6n->fb_tnl_dev)
+ break;
+ dev = t->dev;
+ }
+ err = 0;
+ unregister_netdevice(dev);
+ break;
+ default:
+ err = -EINVAL;
+ }
+ return err;
+}
+
+static const struct net_device_ops vti6_netdev_ops = {
+ .ndo_init = vti6_dev_init,
+ .ndo_uninit = vti6_dev_uninit,
+ .ndo_start_xmit = vti6_tnl_xmit,
+ .ndo_do_ioctl = vti6_ioctl,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
+ .ndo_get_iflink = ip6_tnl_get_iflink,
+};
+
+/**
+ * vti6_dev_setup - setup virtual tunnel device
+ * @dev: virtual device associated with tunnel
+ *
+ * Description:
+ * Initialize function pointers and device parameters
+ **/
+static void vti6_dev_setup(struct net_device *dev)
+{
+ dev->netdev_ops = &vti6_netdev_ops;
+ dev->needs_free_netdev = true;
+ dev->priv_destructor = vti6_dev_free;
+
+ dev->type = ARPHRD_TUNNEL6;
+ dev->min_mtu = IPV4_MIN_MTU;
+ dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
+ dev->flags |= IFF_NOARP;
+ dev->addr_len = sizeof(struct in6_addr);
+ netif_keep_dst(dev);
+ /* This perm addr will be used as interface identifier by IPv6 */
+ dev->addr_assign_type = NET_ADDR_RANDOM;
+ eth_random_addr(dev->perm_addr);
+}
+
+/**
+ * vti6_dev_init_gen - general initializer for all tunnel devices
+ * @dev: virtual device associated with tunnel
+ **/
+static inline int vti6_dev_init_gen(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+
+ t->dev = dev;
+ t->net = dev_net(dev);
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+ return 0;
+}
+
+/**
+ * vti6_dev_init - initializer for all non fallback tunnel devices
+ * @dev: virtual device associated with tunnel
+ **/
+static int vti6_dev_init(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ int err = vti6_dev_init_gen(dev);
+
+ if (err)
+ return err;
+ vti6_link_config(t, true);
+ return 0;
+}
+
+/**
+ * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
+ * @dev: fallback device
+ *
+ * Return: 0
+ **/
+static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net *net = dev_net(dev);
+ struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+
+ t->parms.proto = IPPROTO_IPV6;
+ dev_hold(dev);
+
+ rcu_assign_pointer(ip6n->tnls_wc[0], t);
+ return 0;
+}
+
+static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ return 0;
+}
+
+static void vti6_netlink_parms(struct nlattr *data[],
+ struct __ip6_tnl_parm *parms)
+{
+ memset(parms, 0, sizeof(*parms));
+
+ if (!data)
+ return;
+
+ if (data[IFLA_VTI_LINK])
+ parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
+
+ if (data[IFLA_VTI_LOCAL])
+ parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
+
+ if (data[IFLA_VTI_REMOTE])
+ parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
+
+ if (data[IFLA_VTI_IKEY])
+ parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
+
+ if (data[IFLA_VTI_OKEY])
+ parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
+
+ if (data[IFLA_VTI_FWMARK])
+ parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
+}
+
+static int vti6_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = dev_net(dev);
+ struct ip6_tnl *nt;
+
+ nt = netdev_priv(dev);
+ vti6_netlink_parms(data, &nt->parms);
+
+ nt->parms.proto = IPPROTO_IPV6;
+
+ if (vti6_locate(net, &nt->parms, 0))
+ return -EEXIST;
+
+ return vti6_tnl_create2(dev);
+}
+
+static void vti6_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct net *net = dev_net(dev);
+ struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+
+ if (dev != ip6n->fb_tnl_dev)
+ unregister_netdevice_queue(dev, head);
+}
+
+static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct ip6_tnl *t;
+ struct __ip6_tnl_parm p;
+ struct net *net = dev_net(dev);
+ struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+
+ if (dev == ip6n->fb_tnl_dev)
+ return -EINVAL;
+
+ vti6_netlink_parms(data, &p);
+
+ t = vti6_locate(net, &p, 0);
+
+ if (t) {
+ if (t->dev != dev)
+ return -EEXIST;
+ } else
+ t = netdev_priv(dev);
+
+ return vti6_update(t, &p, tb && tb[IFLA_MTU]);
+}
+
+static size_t vti6_get_size(const struct net_device *dev)
+{
+ return
+ /* IFLA_VTI_LINK */
+ nla_total_size(4) +
+ /* IFLA_VTI_LOCAL */
+ nla_total_size(sizeof(struct in6_addr)) +
+ /* IFLA_VTI_REMOTE */
+ nla_total_size(sizeof(struct in6_addr)) +
+ /* IFLA_VTI_IKEY */
+ nla_total_size(4) +
+ /* IFLA_VTI_OKEY */
+ nla_total_size(4) +
+ /* IFLA_VTI_FWMARK */
+ nla_total_size(4) +
+ 0;
+}
+
+static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ struct ip6_tnl *tunnel = netdev_priv(dev);
+ struct __ip6_tnl_parm *parm = &tunnel->parms;
+
+ if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
+ nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
+ nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
+ nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
+ nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
+ nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
+ [IFLA_VTI_LINK] = { .type = NLA_U32 },
+ [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
+ [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
+ [IFLA_VTI_IKEY] = { .type = NLA_U32 },
+ [IFLA_VTI_OKEY] = { .type = NLA_U32 },
+ [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
+};
+
+static struct rtnl_link_ops vti6_link_ops __read_mostly = {
+ .kind = "vti6",
+ .maxtype = IFLA_VTI_MAX,
+ .policy = vti6_policy,
+ .priv_size = sizeof(struct ip6_tnl),
+ .setup = vti6_dev_setup,
+ .validate = vti6_validate,
+ .newlink = vti6_newlink,
+ .dellink = vti6_dellink,
+ .changelink = vti6_changelink,
+ .get_size = vti6_get_size,
+ .fill_info = vti6_fill_info,
+ .get_link_net = ip6_tnl_get_link_net,
+};
+
+static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
+ struct list_head *list)
+{
+ int h;
+ struct ip6_tnl *t;
+
+ for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
+ t = rtnl_dereference(ip6n->tnls_r_l[h]);
+ while (t) {
+ unregister_netdevice_queue(t->dev, list);
+ t = rtnl_dereference(t->next);
+ }
+ }
+
+ t = rtnl_dereference(ip6n->tnls_wc[0]);
+ if (t)
+ unregister_netdevice_queue(t->dev, list);
+}
+
+static int __net_init vti6_init_net(struct net *net)
+{
+ struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+ struct ip6_tnl *t = NULL;
+ int err;
+
+ ip6n->tnls[0] = ip6n->tnls_wc;
+ ip6n->tnls[1] = ip6n->tnls_r_l;
+
+ if (!net_has_fallback_tunnels(net))
+ return 0;
+ err = -ENOMEM;
+ ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
+ NET_NAME_UNKNOWN, vti6_dev_setup);
+
+ if (!ip6n->fb_tnl_dev)
+ goto err_alloc_dev;
+ dev_net_set(ip6n->fb_tnl_dev, net);
+ ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
+
+ err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
+ if (err < 0)
+ goto err_register;
+
+ err = register_netdev(ip6n->fb_tnl_dev);
+ if (err < 0)
+ goto err_register;
+
+ t = netdev_priv(ip6n->fb_tnl_dev);
+
+ strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
+ return 0;
+
+err_register:
+ free_netdev(ip6n->fb_tnl_dev);
+err_alloc_dev:
+ return err;
+}
+
+static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
+{
+ struct vti6_net *ip6n;
+ struct net *net;
+ LIST_HEAD(list);
+
+ rtnl_lock();
+ list_for_each_entry(net, net_list, exit_list) {
+ ip6n = net_generic(net, vti6_net_id);
+ vti6_destroy_tunnels(ip6n, &list);
+ }
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+}
+
+static struct pernet_operations vti6_net_ops = {
+ .init = vti6_init_net,
+ .exit_batch = vti6_exit_batch_net,
+ .id = &vti6_net_id,
+ .size = sizeof(struct vti6_net),
+};
+
+static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
+ .handler = vti6_rcv,
+ .cb_handler = vti6_rcv_cb,
+ .err_handler = vti6_err,
+ .priority = 100,
+};
+
+static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
+ .handler = vti6_rcv,
+ .cb_handler = vti6_rcv_cb,
+ .err_handler = vti6_err,
+ .priority = 100,
+};
+
+static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
+ .handler = vti6_rcv,
+ .cb_handler = vti6_rcv_cb,
+ .err_handler = vti6_err,
+ .priority = 100,
+};
+
+/**
+ * vti6_tunnel_init - register protocol and reserve needed resources
+ *
+ * Return: 0 on success
+ **/
+static int __init vti6_tunnel_init(void)
+{
+ const char *msg;
+ int err;
+
+ msg = "tunnel device";
+ err = register_pernet_device(&vti6_net_ops);
+ if (err < 0)
+ goto pernet_dev_failed;
+
+ msg = "tunnel protocols";
+ err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
+ if (err < 0)
+ goto xfrm_proto_esp_failed;
+ err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
+ if (err < 0)
+ goto xfrm_proto_ah_failed;
+ err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
+ if (err < 0)
+ goto xfrm_proto_comp_failed;
+
+ msg = "netlink interface";
+ err = rtnl_link_register(&vti6_link_ops);
+ if (err < 0)
+ goto rtnl_link_failed;
+
+ return 0;
+
+rtnl_link_failed:
+ xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
+xfrm_proto_comp_failed:
+ xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
+xfrm_proto_ah_failed:
+ xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
+xfrm_proto_esp_failed:
+ unregister_pernet_device(&vti6_net_ops);
+pernet_dev_failed:
+ pr_err("vti6 init: failed to register %s\n", msg);
+ return err;
+}
+
+/**
+ * vti6_tunnel_cleanup - free resources and unregister protocol
+ **/
+static void __exit vti6_tunnel_cleanup(void)
+{
+ rtnl_link_unregister(&vti6_link_ops);
+ xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
+ xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
+ xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
+ unregister_pernet_device(&vti6_net_ops);
+}
+
+module_init(vti6_tunnel_init);
+module_exit(vti6_tunnel_cleanup);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_RTNL_LINK("vti6");
+MODULE_ALIAS_NETDEV("ip6_vti0");
+MODULE_AUTHOR("Steffen Klassert");
+MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
new file mode 100644
index 0000000..d0b7e02
--- /dev/null
+++ b/net/ipv6/ip6mr.c
@@ -0,0 +1,2438 @@
+/*
+ * Linux IPv6 multicast routing support for BSD pim6sd
+ * Based on net/ipv4/ipmr.c.
+ *
+ * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
+ * LSIIT Laboratory, Strasbourg, France
+ * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
+ * 6WIND, Paris, France
+ * Copyright (C)2007,2008 USAGI/WIDE Project
+ * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/uaccess.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/fcntl.h>
+#include <linux/stat.h>
+#include <linux/socket.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <linux/compat.h>
+#include <linux/rhashtable.h>
+#include <net/protocol.h>
+#include <linux/skbuff.h>
+#include <net/raw.h>
+#include <linux/notifier.h>
+#include <linux/if_arp.h>
+#include <net/checksum.h>
+#include <net/netlink.h>
+#include <net/fib_rules.h>
+
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <linux/mroute6.h>
+#include <linux/pim.h>
+#include <net/addrconf.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/export.h>
+#include <net/ip6_checksum.h>
+#include <linux/netconf.h>
+
+struct ip6mr_rule {
+ struct fib_rule common;
+};
+
+struct ip6mr_result {
+ struct mr_table *mrt;
+};
+
+/* Big lock, protecting vif table, mrt cache and mroute socket state.
+ Note that the changes are semaphored via rtnl_lock.
+ */
+
+static DEFINE_RWLOCK(mrt_lock);
+
+/* Multicast router control variables */
+
+/* Special spinlock for queue of unresolved entries */
+static DEFINE_SPINLOCK(mfc_unres_lock);
+
+/* We return to original Alan's scheme. Hash table of resolved
+ entries is changed only in process context and protected
+ with weak lock mrt_lock. Queue of unresolved entries is protected
+ with strong spinlock mfc_unres_lock.
+
+ In this case data path is free of exclusive locks at all.
+ */
+
+static struct kmem_cache *mrt_cachep __read_mostly;
+
+static struct mr_table *ip6mr_new_table(struct net *net, u32 id);
+static void ip6mr_free_table(struct mr_table *mrt);
+
+static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
+ struct sk_buff *skb, struct mfc6_cache *cache);
+static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt,
+ mifi_t mifi, int assert);
+static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
+ int cmd);
+static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt);
+static int ip6mr_rtm_dumproute(struct sk_buff *skb,
+ struct netlink_callback *cb);
+static void mroute_clean_tables(struct mr_table *mrt, bool all);
+static void ipmr_expire_process(struct timer_list *t);
+
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+#define ip6mr_for_each_table(mrt, net) \
+ list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
+
+static struct mr_table *ip6mr_mr_table_iter(struct net *net,
+ struct mr_table *mrt)
+{
+ struct mr_table *ret;
+
+ if (!mrt)
+ ret = list_entry_rcu(net->ipv6.mr6_tables.next,
+ struct mr_table, list);
+ else
+ ret = list_entry_rcu(mrt->list.next,
+ struct mr_table, list);
+
+ if (&ret->list == &net->ipv6.mr6_tables)
+ return NULL;
+ return ret;
+}
+
+static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
+{
+ struct mr_table *mrt;
+
+ ip6mr_for_each_table(mrt, net) {
+ if (mrt->id == id)
+ return mrt;
+ }
+ return NULL;
+}
+
+static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
+ struct mr_table **mrt)
+{
+ int err;
+ struct ip6mr_result res;
+ struct fib_lookup_arg arg = {
+ .result = &res,
+ .flags = FIB_LOOKUP_NOREF,
+ };
+
+ err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
+ flowi6_to_flowi(flp6), 0, &arg);
+ if (err < 0)
+ return err;
+ *mrt = res.mrt;
+ return 0;
+}
+
+static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
+ int flags, struct fib_lookup_arg *arg)
+{
+ struct ip6mr_result *res = arg->result;
+ struct mr_table *mrt;
+
+ switch (rule->action) {
+ case FR_ACT_TO_TBL:
+ break;
+ case FR_ACT_UNREACHABLE:
+ return -ENETUNREACH;
+ case FR_ACT_PROHIBIT:
+ return -EACCES;
+ case FR_ACT_BLACKHOLE:
+ default:
+ return -EINVAL;
+ }
+
+ mrt = ip6mr_get_table(rule->fr_net, rule->table);
+ if (!mrt)
+ return -EAGAIN;
+ res->mrt = mrt;
+ return 0;
+}
+
+static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
+{
+ return 1;
+}
+
+static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
+ FRA_GENERIC_POLICY,
+};
+
+static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
+ struct fib_rule_hdr *frh, struct nlattr **tb,
+ struct netlink_ext_ack *extack)
+{
+ return 0;
+}
+
+static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
+ struct nlattr **tb)
+{
+ return 1;
+}
+
+static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
+ struct fib_rule_hdr *frh)
+{
+ frh->dst_len = 0;
+ frh->src_len = 0;
+ frh->tos = 0;
+ return 0;
+}
+
+static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
+ .family = RTNL_FAMILY_IP6MR,
+ .rule_size = sizeof(struct ip6mr_rule),
+ .addr_size = sizeof(struct in6_addr),
+ .action = ip6mr_rule_action,
+ .match = ip6mr_rule_match,
+ .configure = ip6mr_rule_configure,
+ .compare = ip6mr_rule_compare,
+ .fill = ip6mr_rule_fill,
+ .nlgroup = RTNLGRP_IPV6_RULE,
+ .policy = ip6mr_rule_policy,
+ .owner = THIS_MODULE,
+};
+
+static int __net_init ip6mr_rules_init(struct net *net)
+{
+ struct fib_rules_ops *ops;
+ struct mr_table *mrt;
+ int err;
+
+ ops = fib_rules_register(&ip6mr_rules_ops_template, net);
+ if (IS_ERR(ops))
+ return PTR_ERR(ops);
+
+ INIT_LIST_HEAD(&net->ipv6.mr6_tables);
+
+ mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
+ if (IS_ERR(mrt)) {
+ err = PTR_ERR(mrt);
+ goto err1;
+ }
+
+ err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
+ if (err < 0)
+ goto err2;
+
+ net->ipv6.mr6_rules_ops = ops;
+ return 0;
+
+err2:
+ ip6mr_free_table(mrt);
+err1:
+ fib_rules_unregister(ops);
+ return err;
+}
+
+static void __net_exit ip6mr_rules_exit(struct net *net)
+{
+ struct mr_table *mrt, *next;
+
+ rtnl_lock();
+ list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
+ list_del(&mrt->list);
+ ip6mr_free_table(mrt);
+ }
+ fib_rules_unregister(net->ipv6.mr6_rules_ops);
+ rtnl_unlock();
+}
+
+static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb)
+{
+ return fib_rules_dump(net, nb, RTNL_FAMILY_IP6MR);
+}
+
+static unsigned int ip6mr_rules_seq_read(struct net *net)
+{
+ return fib_rules_seq_read(net, RTNL_FAMILY_IP6MR);
+}
+
+bool ip6mr_rule_default(const struct fib_rule *rule)
+{
+ return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL &&
+ rule->table == RT6_TABLE_DFLT && !rule->l3mdev;
+}
+EXPORT_SYMBOL(ip6mr_rule_default);
+#else
+#define ip6mr_for_each_table(mrt, net) \
+ for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
+
+static struct mr_table *ip6mr_mr_table_iter(struct net *net,
+ struct mr_table *mrt)
+{
+ if (!mrt)
+ return net->ipv6.mrt6;
+ return NULL;
+}
+
+static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
+{
+ return net->ipv6.mrt6;
+}
+
+static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
+ struct mr_table **mrt)
+{
+ *mrt = net->ipv6.mrt6;
+ return 0;
+}
+
+static int __net_init ip6mr_rules_init(struct net *net)
+{
+ struct mr_table *mrt;
+
+ mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
+ if (IS_ERR(mrt))
+ return PTR_ERR(mrt);
+ net->ipv6.mrt6 = mrt;
+ return 0;
+}
+
+static void __net_exit ip6mr_rules_exit(struct net *net)
+{
+ rtnl_lock();
+ ip6mr_free_table(net->ipv6.mrt6);
+ net->ipv6.mrt6 = NULL;
+ rtnl_unlock();
+}
+
+static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb)
+{
+ return 0;
+}
+
+static unsigned int ip6mr_rules_seq_read(struct net *net)
+{
+ return 0;
+}
+#endif
+
+static int ip6mr_hash_cmp(struct rhashtable_compare_arg *arg,
+ const void *ptr)
+{
+ const struct mfc6_cache_cmp_arg *cmparg = arg->key;
+ struct mfc6_cache *c = (struct mfc6_cache *)ptr;
+
+ return !ipv6_addr_equal(&c->mf6c_mcastgrp, &cmparg->mf6c_mcastgrp) ||
+ !ipv6_addr_equal(&c->mf6c_origin, &cmparg->mf6c_origin);
+}
+
+static const struct rhashtable_params ip6mr_rht_params = {
+ .head_offset = offsetof(struct mr_mfc, mnode),
+ .key_offset = offsetof(struct mfc6_cache, cmparg),
+ .key_len = sizeof(struct mfc6_cache_cmp_arg),
+ .nelem_hint = 3,
+ .locks_mul = 1,
+ .obj_cmpfn = ip6mr_hash_cmp,
+ .automatic_shrinking = true,
+};
+
+static void ip6mr_new_table_set(struct mr_table *mrt,
+ struct net *net)
+{
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+ list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
+#endif
+}
+
+static struct mfc6_cache_cmp_arg ip6mr_mr_table_ops_cmparg_any = {
+ .mf6c_origin = IN6ADDR_ANY_INIT,
+ .mf6c_mcastgrp = IN6ADDR_ANY_INIT,
+};
+
+static struct mr_table_ops ip6mr_mr_table_ops = {
+ .rht_params = &ip6mr_rht_params,
+ .cmparg_any = &ip6mr_mr_table_ops_cmparg_any,
+};
+
+static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
+{
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(net, id);
+ if (mrt)
+ return mrt;
+
+ return mr_table_alloc(net, id, &ip6mr_mr_table_ops,
+ ipmr_expire_process, ip6mr_new_table_set);
+}
+
+static void ip6mr_free_table(struct mr_table *mrt)
+{
+ del_timer_sync(&mrt->ipmr_expire_timer);
+ mroute_clean_tables(mrt, true);
+ rhltable_destroy(&mrt->mfc_hash);
+ kfree(mrt);
+}
+
+#ifdef CONFIG_PROC_FS
+/* The /proc interfaces to multicast routing
+ * /proc/ip6_mr_cache /proc/ip6_mr_vif
+ */
+
+static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(mrt_lock)
+{
+ struct mr_vif_iter *iter = seq->private;
+ struct net *net = seq_file_net(seq);
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
+ if (!mrt)
+ return ERR_PTR(-ENOENT);
+
+ iter->mrt = mrt;
+
+ read_lock(&mrt_lock);
+ return mr_vif_seq_start(seq, pos);
+}
+
+static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
+ __releases(mrt_lock)
+{
+ read_unlock(&mrt_lock);
+}
+
+static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
+{
+ struct mr_vif_iter *iter = seq->private;
+ struct mr_table *mrt = iter->mrt;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq,
+ "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
+ } else {
+ const struct vif_device *vif = v;
+ const char *name = vif->dev ? vif->dev->name : "none";
+
+ seq_printf(seq,
+ "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
+ vif - mrt->vif_table,
+ name, vif->bytes_in, vif->pkt_in,
+ vif->bytes_out, vif->pkt_out,
+ vif->flags);
+ }
+ return 0;
+}
+
+static const struct seq_operations ip6mr_vif_seq_ops = {
+ .start = ip6mr_vif_seq_start,
+ .next = mr_vif_seq_next,
+ .stop = ip6mr_vif_seq_stop,
+ .show = ip6mr_vif_seq_show,
+};
+
+static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct net *net = seq_file_net(seq);
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
+ if (!mrt)
+ return ERR_PTR(-ENOENT);
+
+ return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
+}
+
+static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
+{
+ int n;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq,
+ "Group "
+ "Origin "
+ "Iif Pkts Bytes Wrong Oifs\n");
+ } else {
+ const struct mfc6_cache *mfc = v;
+ const struct mr_mfc_iter *it = seq->private;
+ struct mr_table *mrt = it->mrt;
+
+ seq_printf(seq, "%pI6 %pI6 %-3hd",
+ &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
+ mfc->_c.mfc_parent);
+
+ if (it->cache != &mrt->mfc_unres_queue) {
+ seq_printf(seq, " %8lu %8lu %8lu",
+ mfc->_c.mfc_un.res.pkt,
+ mfc->_c.mfc_un.res.bytes,
+ mfc->_c.mfc_un.res.wrong_if);
+ for (n = mfc->_c.mfc_un.res.minvif;
+ n < mfc->_c.mfc_un.res.maxvif; n++) {
+ if (VIF_EXISTS(mrt, n) &&
+ mfc->_c.mfc_un.res.ttls[n] < 255)
+ seq_printf(seq,
+ " %2d:%-3d", n,
+ mfc->_c.mfc_un.res.ttls[n]);
+ }
+ } else {
+ /* unresolved mfc_caches don't contain
+ * pkt, bytes and wrong_if values
+ */
+ seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
+ }
+ seq_putc(seq, '\n');
+ }
+ return 0;
+}
+
+static const struct seq_operations ipmr_mfc_seq_ops = {
+ .start = ipmr_mfc_seq_start,
+ .next = mr_mfc_seq_next,
+ .stop = mr_mfc_seq_stop,
+ .show = ipmr_mfc_seq_show,
+};
+#endif
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+
+static int pim6_rcv(struct sk_buff *skb)
+{
+ struct pimreghdr *pim;
+ struct ipv6hdr *encap;
+ struct net_device *reg_dev = NULL;
+ struct net *net = dev_net(skb->dev);
+ struct mr_table *mrt;
+ struct flowi6 fl6 = {
+ .flowi6_iif = skb->dev->ifindex,
+ .flowi6_mark = skb->mark,
+ };
+ int reg_vif_num;
+
+ if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
+ goto drop;
+
+ pim = (struct pimreghdr *)skb_transport_header(skb);
+ if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) ||
+ (pim->flags & PIM_NULL_REGISTER) ||
+ (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
+ sizeof(*pim), IPPROTO_PIM,
+ csum_partial((void *)pim, sizeof(*pim), 0)) &&
+ csum_fold(skb_checksum(skb, 0, skb->len, 0))))
+ goto drop;
+
+ /* check if the inner packet is destined to mcast group */
+ encap = (struct ipv6hdr *)(skb_transport_header(skb) +
+ sizeof(*pim));
+
+ if (!ipv6_addr_is_multicast(&encap->daddr) ||
+ encap->payload_len == 0 ||
+ ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
+ goto drop;
+
+ if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
+ goto drop;
+ reg_vif_num = mrt->mroute_reg_vif_num;
+
+ read_lock(&mrt_lock);
+ if (reg_vif_num >= 0)
+ reg_dev = mrt->vif_table[reg_vif_num].dev;
+ if (reg_dev)
+ dev_hold(reg_dev);
+ read_unlock(&mrt_lock);
+
+ if (!reg_dev)
+ goto drop;
+
+ skb->mac_header = skb->network_header;
+ skb_pull(skb, (u8 *)encap - skb->data);
+ skb_reset_network_header(skb);
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->ip_summed = CHECKSUM_NONE;
+
+ skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
+
+ netif_rx(skb);
+
+ dev_put(reg_dev);
+ return 0;
+ drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static const struct inet6_protocol pim6_protocol = {
+ .handler = pim6_rcv,
+};
+
+/* Service routines creating virtual interfaces: PIMREG */
+
+static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct net *net = dev_net(dev);
+ struct mr_table *mrt;
+ struct flowi6 fl6 = {
+ .flowi6_oif = dev->ifindex,
+ .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
+ .flowi6_mark = skb->mark,
+ };
+ int err;
+
+ err = ip6mr_fib_lookup(net, &fl6, &mrt);
+ if (err < 0) {
+ kfree_skb(skb);
+ return err;
+ }
+
+ read_lock(&mrt_lock);
+ dev->stats.tx_bytes += skb->len;
+ dev->stats.tx_packets++;
+ ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
+ read_unlock(&mrt_lock);
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static int reg_vif_get_iflink(const struct net_device *dev)
+{
+ return 0;
+}
+
+static const struct net_device_ops reg_vif_netdev_ops = {
+ .ndo_start_xmit = reg_vif_xmit,
+ .ndo_get_iflink = reg_vif_get_iflink,
+};
+
+static void reg_vif_setup(struct net_device *dev)
+{
+ dev->type = ARPHRD_PIMREG;
+ dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
+ dev->flags = IFF_NOARP;
+ dev->netdev_ops = ®_vif_netdev_ops;
+ dev->needs_free_netdev = true;
+ dev->features |= NETIF_F_NETNS_LOCAL;
+}
+
+static struct net_device *ip6mr_reg_vif(struct net *net, struct mr_table *mrt)
+{
+ struct net_device *dev;
+ char name[IFNAMSIZ];
+
+ if (mrt->id == RT6_TABLE_DFLT)
+ sprintf(name, "pim6reg");
+ else
+ sprintf(name, "pim6reg%u", mrt->id);
+
+ dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
+ if (!dev)
+ return NULL;
+
+ dev_net_set(dev, net);
+
+ if (register_netdevice(dev)) {
+ free_netdev(dev);
+ return NULL;
+ }
+
+ if (dev_open(dev))
+ goto failure;
+
+ dev_hold(dev);
+ return dev;
+
+failure:
+ unregister_netdevice(dev);
+ return NULL;
+}
+#endif
+
+static int call_ip6mr_vif_entry_notifiers(struct net *net,
+ enum fib_event_type event_type,
+ struct vif_device *vif,
+ mifi_t vif_index, u32 tb_id)
+{
+ return mr_call_vif_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
+ vif, vif_index, tb_id,
+ &net->ipv6.ipmr_seq);
+}
+
+static int call_ip6mr_mfc_entry_notifiers(struct net *net,
+ enum fib_event_type event_type,
+ struct mfc6_cache *mfc, u32 tb_id)
+{
+ return mr_call_mfc_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
+ &mfc->_c, tb_id, &net->ipv6.ipmr_seq);
+}
+
+/* Delete a VIF entry */
+static int mif6_delete(struct mr_table *mrt, int vifi, int notify,
+ struct list_head *head)
+{
+ struct vif_device *v;
+ struct net_device *dev;
+ struct inet6_dev *in6_dev;
+
+ if (vifi < 0 || vifi >= mrt->maxvif)
+ return -EADDRNOTAVAIL;
+
+ v = &mrt->vif_table[vifi];
+
+ if (VIF_EXISTS(mrt, vifi))
+ call_ip6mr_vif_entry_notifiers(read_pnet(&mrt->net),
+ FIB_EVENT_VIF_DEL, v, vifi,
+ mrt->id);
+
+ write_lock_bh(&mrt_lock);
+ dev = v->dev;
+ v->dev = NULL;
+
+ if (!dev) {
+ write_unlock_bh(&mrt_lock);
+ return -EADDRNOTAVAIL;
+ }
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (vifi == mrt->mroute_reg_vif_num)
+ mrt->mroute_reg_vif_num = -1;
+#endif
+
+ if (vifi + 1 == mrt->maxvif) {
+ int tmp;
+ for (tmp = vifi - 1; tmp >= 0; tmp--) {
+ if (VIF_EXISTS(mrt, tmp))
+ break;
+ }
+ mrt->maxvif = tmp + 1;
+ }
+
+ write_unlock_bh(&mrt_lock);
+
+ dev_set_allmulti(dev, -1);
+
+ in6_dev = __in6_dev_get(dev);
+ if (in6_dev) {
+ in6_dev->cnf.mc_forwarding--;
+ inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
+ NETCONFA_MC_FORWARDING,
+ dev->ifindex, &in6_dev->cnf);
+ }
+
+ if ((v->flags & MIFF_REGISTER) && !notify)
+ unregister_netdevice_queue(dev, head);
+
+ dev_put(dev);
+ return 0;
+}
+
+static inline void ip6mr_cache_free_rcu(struct rcu_head *head)
+{
+ struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
+
+ kmem_cache_free(mrt_cachep, (struct mfc6_cache *)c);
+}
+
+static inline void ip6mr_cache_free(struct mfc6_cache *c)
+{
+ call_rcu(&c->_c.rcu, ip6mr_cache_free_rcu);
+}
+
+/* Destroy an unresolved cache entry, killing queued skbs
+ and reporting error to netlink readers.
+ */
+
+static void ip6mr_destroy_unres(struct mr_table *mrt, struct mfc6_cache *c)
+{
+ struct net *net = read_pnet(&mrt->net);
+ struct sk_buff *skb;
+
+ atomic_dec(&mrt->cache_resolve_queue_len);
+
+ while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved)) != NULL) {
+ if (ipv6_hdr(skb)->version == 0) {
+ struct nlmsghdr *nlh = skb_pull(skb,
+ sizeof(struct ipv6hdr));
+ nlh->nlmsg_type = NLMSG_ERROR;
+ nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
+ skb_trim(skb, nlh->nlmsg_len);
+ ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
+ rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
+ } else
+ kfree_skb(skb);
+ }
+
+ ip6mr_cache_free(c);
+}
+
+
+/* Timer process for all the unresolved queue. */
+
+static void ipmr_do_expire_process(struct mr_table *mrt)
+{
+ unsigned long now = jiffies;
+ unsigned long expires = 10 * HZ;
+ struct mr_mfc *c, *next;
+
+ list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
+ if (time_after(c->mfc_un.unres.expires, now)) {
+ /* not yet... */
+ unsigned long interval = c->mfc_un.unres.expires - now;
+ if (interval < expires)
+ expires = interval;
+ continue;
+ }
+
+ list_del(&c->list);
+ mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
+ ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
+ }
+
+ if (!list_empty(&mrt->mfc_unres_queue))
+ mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
+}
+
+static void ipmr_expire_process(struct timer_list *t)
+{
+ struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
+
+ if (!spin_trylock(&mfc_unres_lock)) {
+ mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
+ return;
+ }
+
+ if (!list_empty(&mrt->mfc_unres_queue))
+ ipmr_do_expire_process(mrt);
+
+ spin_unlock(&mfc_unres_lock);
+}
+
+/* Fill oifs list. It is called under write locked mrt_lock. */
+
+static void ip6mr_update_thresholds(struct mr_table *mrt,
+ struct mr_mfc *cache,
+ unsigned char *ttls)
+{
+ int vifi;
+
+ cache->mfc_un.res.minvif = MAXMIFS;
+ cache->mfc_un.res.maxvif = 0;
+ memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
+
+ for (vifi = 0; vifi < mrt->maxvif; vifi++) {
+ if (VIF_EXISTS(mrt, vifi) &&
+ ttls[vifi] && ttls[vifi] < 255) {
+ cache->mfc_un.res.ttls[vifi] = ttls[vifi];
+ if (cache->mfc_un.res.minvif > vifi)
+ cache->mfc_un.res.minvif = vifi;
+ if (cache->mfc_un.res.maxvif <= vifi)
+ cache->mfc_un.res.maxvif = vifi + 1;
+ }
+ }
+ cache->mfc_un.res.lastuse = jiffies;
+}
+
+static int mif6_add(struct net *net, struct mr_table *mrt,
+ struct mif6ctl *vifc, int mrtsock)
+{
+ int vifi = vifc->mif6c_mifi;
+ struct vif_device *v = &mrt->vif_table[vifi];
+ struct net_device *dev;
+ struct inet6_dev *in6_dev;
+ int err;
+
+ /* Is vif busy ? */
+ if (VIF_EXISTS(mrt, vifi))
+ return -EADDRINUSE;
+
+ switch (vifc->mif6c_flags) {
+#ifdef CONFIG_IPV6_PIMSM_V2
+ case MIFF_REGISTER:
+ /*
+ * Special Purpose VIF in PIM
+ * All the packets will be sent to the daemon
+ */
+ if (mrt->mroute_reg_vif_num >= 0)
+ return -EADDRINUSE;
+ dev = ip6mr_reg_vif(net, mrt);
+ if (!dev)
+ return -ENOBUFS;
+ err = dev_set_allmulti(dev, 1);
+ if (err) {
+ unregister_netdevice(dev);
+ dev_put(dev);
+ return err;
+ }
+ break;
+#endif
+ case 0:
+ dev = dev_get_by_index(net, vifc->mif6c_pifi);
+ if (!dev)
+ return -EADDRNOTAVAIL;
+ err = dev_set_allmulti(dev, 1);
+ if (err) {
+ dev_put(dev);
+ return err;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ in6_dev = __in6_dev_get(dev);
+ if (in6_dev) {
+ in6_dev->cnf.mc_forwarding++;
+ inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
+ NETCONFA_MC_FORWARDING,
+ dev->ifindex, &in6_dev->cnf);
+ }
+
+ /* Fill in the VIF structures */
+ vif_device_init(v, dev, vifc->vifc_rate_limit, vifc->vifc_threshold,
+ vifc->mif6c_flags | (!mrtsock ? VIFF_STATIC : 0),
+ MIFF_REGISTER);
+
+ /* And finish update writing critical data */
+ write_lock_bh(&mrt_lock);
+ v->dev = dev;
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (v->flags & MIFF_REGISTER)
+ mrt->mroute_reg_vif_num = vifi;
+#endif
+ if (vifi + 1 > mrt->maxvif)
+ mrt->maxvif = vifi + 1;
+ write_unlock_bh(&mrt_lock);
+ call_ip6mr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD,
+ v, vifi, mrt->id);
+ return 0;
+}
+
+static struct mfc6_cache *ip6mr_cache_find(struct mr_table *mrt,
+ const struct in6_addr *origin,
+ const struct in6_addr *mcastgrp)
+{
+ struct mfc6_cache_cmp_arg arg = {
+ .mf6c_origin = *origin,
+ .mf6c_mcastgrp = *mcastgrp,
+ };
+
+ return mr_mfc_find(mrt, &arg);
+}
+
+/* Look for a (*,G) entry */
+static struct mfc6_cache *ip6mr_cache_find_any(struct mr_table *mrt,
+ struct in6_addr *mcastgrp,
+ mifi_t mifi)
+{
+ struct mfc6_cache_cmp_arg arg = {
+ .mf6c_origin = in6addr_any,
+ .mf6c_mcastgrp = *mcastgrp,
+ };
+
+ if (ipv6_addr_any(mcastgrp))
+ return mr_mfc_find_any_parent(mrt, mifi);
+ return mr_mfc_find_any(mrt, mifi, &arg);
+}
+
+/* Look for a (S,G,iif) entry if parent != -1 */
+static struct mfc6_cache *
+ip6mr_cache_find_parent(struct mr_table *mrt,
+ const struct in6_addr *origin,
+ const struct in6_addr *mcastgrp,
+ int parent)
+{
+ struct mfc6_cache_cmp_arg arg = {
+ .mf6c_origin = *origin,
+ .mf6c_mcastgrp = *mcastgrp,
+ };
+
+ return mr_mfc_find_parent(mrt, &arg, parent);
+}
+
+/* Allocate a multicast cache entry */
+static struct mfc6_cache *ip6mr_cache_alloc(void)
+{
+ struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
+ if (!c)
+ return NULL;
+ c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
+ c->_c.mfc_un.res.minvif = MAXMIFS;
+ c->_c.free = ip6mr_cache_free_rcu;
+ refcount_set(&c->_c.mfc_un.res.refcount, 1);
+ return c;
+}
+
+static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
+{
+ struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
+ if (!c)
+ return NULL;
+ skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
+ c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
+ return c;
+}
+
+/*
+ * A cache entry has gone into a resolved state from queued
+ */
+
+static void ip6mr_cache_resolve(struct net *net, struct mr_table *mrt,
+ struct mfc6_cache *uc, struct mfc6_cache *c)
+{
+ struct sk_buff *skb;
+
+ /*
+ * Play the pending entries through our router
+ */
+
+ while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
+ if (ipv6_hdr(skb)->version == 0) {
+ struct nlmsghdr *nlh = skb_pull(skb,
+ sizeof(struct ipv6hdr));
+
+ if (mr_fill_mroute(mrt, skb, &c->_c,
+ nlmsg_data(nlh)) > 0) {
+ nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
+ } else {
+ nlh->nlmsg_type = NLMSG_ERROR;
+ nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
+ skb_trim(skb, nlh->nlmsg_len);
+ ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
+ }
+ rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
+ } else
+ ip6_mr_forward(net, mrt, skb, c);
+ }
+}
+
+/*
+ * Bounce a cache query up to pim6sd and netlink.
+ *
+ * Called under mrt_lock.
+ */
+
+static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt,
+ mifi_t mifi, int assert)
+{
+ struct sock *mroute6_sk;
+ struct sk_buff *skb;
+ struct mrt6msg *msg;
+ int ret;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (assert == MRT6MSG_WHOLEPKT)
+ skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
+ +sizeof(*msg));
+ else
+#endif
+ skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
+
+ if (!skb)
+ return -ENOBUFS;
+
+ /* I suppose that internal messages
+ * do not require checksums */
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (assert == MRT6MSG_WHOLEPKT) {
+ /* Ugly, but we have no choice with this interface.
+ Duplicate old header, fix length etc.
+ And all this only to mangle msg->im6_msgtype and
+ to set msg->im6_mbz to "mbz" :-)
+ */
+ skb_push(skb, -skb_network_offset(pkt));
+
+ skb_push(skb, sizeof(*msg));
+ skb_reset_transport_header(skb);
+ msg = (struct mrt6msg *)skb_transport_header(skb);
+ msg->im6_mbz = 0;
+ msg->im6_msgtype = MRT6MSG_WHOLEPKT;
+ msg->im6_mif = mrt->mroute_reg_vif_num;
+ msg->im6_pad = 0;
+ msg->im6_src = ipv6_hdr(pkt)->saddr;
+ msg->im6_dst = ipv6_hdr(pkt)->daddr;
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ } else
+#endif
+ {
+ /*
+ * Copy the IP header
+ */
+
+ skb_put(skb, sizeof(struct ipv6hdr));
+ skb_reset_network_header(skb);
+ skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
+
+ /*
+ * Add our header
+ */
+ skb_put(skb, sizeof(*msg));
+ skb_reset_transport_header(skb);
+ msg = (struct mrt6msg *)skb_transport_header(skb);
+
+ msg->im6_mbz = 0;
+ msg->im6_msgtype = assert;
+ msg->im6_mif = mifi;
+ msg->im6_pad = 0;
+ msg->im6_src = ipv6_hdr(pkt)->saddr;
+ msg->im6_dst = ipv6_hdr(pkt)->daddr;
+
+ skb_dst_set(skb, dst_clone(skb_dst(pkt)));
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+
+ rcu_read_lock();
+ mroute6_sk = rcu_dereference(mrt->mroute_sk);
+ if (!mroute6_sk) {
+ rcu_read_unlock();
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+
+ mrt6msg_netlink_event(mrt, skb);
+
+ /* Deliver to user space multicast routing algorithms */
+ ret = sock_queue_rcv_skb(mroute6_sk, skb);
+ rcu_read_unlock();
+ if (ret < 0) {
+ net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
+ kfree_skb(skb);
+ }
+
+ return ret;
+}
+
+/* Queue a packet for resolution. It gets locked cache entry! */
+static int ip6mr_cache_unresolved(struct mr_table *mrt, mifi_t mifi,
+ struct sk_buff *skb)
+{
+ struct mfc6_cache *c;
+ bool found = false;
+ int err;
+
+ spin_lock_bh(&mfc_unres_lock);
+ list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
+ if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
+ ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ /*
+ * Create a new entry if allowable
+ */
+
+ if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
+ (c = ip6mr_cache_alloc_unres()) == NULL) {
+ spin_unlock_bh(&mfc_unres_lock);
+
+ kfree_skb(skb);
+ return -ENOBUFS;
+ }
+
+ /* Fill in the new cache entry */
+ c->_c.mfc_parent = -1;
+ c->mf6c_origin = ipv6_hdr(skb)->saddr;
+ c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
+
+ /*
+ * Reflect first query at pim6sd
+ */
+ err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
+ if (err < 0) {
+ /* If the report failed throw the cache entry
+ out - Brad Parker
+ */
+ spin_unlock_bh(&mfc_unres_lock);
+
+ ip6mr_cache_free(c);
+ kfree_skb(skb);
+ return err;
+ }
+
+ atomic_inc(&mrt->cache_resolve_queue_len);
+ list_add(&c->_c.list, &mrt->mfc_unres_queue);
+ mr6_netlink_event(mrt, c, RTM_NEWROUTE);
+
+ ipmr_do_expire_process(mrt);
+ }
+
+ /* See if we can append the packet */
+ if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
+ kfree_skb(skb);
+ err = -ENOBUFS;
+ } else {
+ skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
+ err = 0;
+ }
+
+ spin_unlock_bh(&mfc_unres_lock);
+ return err;
+}
+
+/*
+ * MFC6 cache manipulation by user space
+ */
+
+static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc,
+ int parent)
+{
+ struct mfc6_cache *c;
+
+ /* The entries are added/deleted only under RTNL */
+ rcu_read_lock();
+ c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
+ &mfc->mf6cc_mcastgrp.sin6_addr, parent);
+ rcu_read_unlock();
+ if (!c)
+ return -ENOENT;
+ rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ip6mr_rht_params);
+ list_del_rcu(&c->_c.list);
+
+ call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
+ FIB_EVENT_ENTRY_DEL, c, mrt->id);
+ mr6_netlink_event(mrt, c, RTM_DELROUTE);
+ mr_cache_put(&c->_c);
+ return 0;
+}
+
+static int ip6mr_device_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct net *net = dev_net(dev);
+ struct mr_table *mrt;
+ struct vif_device *v;
+ int ct;
+
+ if (event != NETDEV_UNREGISTER)
+ return NOTIFY_DONE;
+
+ ip6mr_for_each_table(mrt, net) {
+ v = &mrt->vif_table[0];
+ for (ct = 0; ct < mrt->maxvif; ct++, v++) {
+ if (v->dev == dev)
+ mif6_delete(mrt, ct, 1, NULL);
+ }
+ }
+
+ return NOTIFY_DONE;
+}
+
+static unsigned int ip6mr_seq_read(struct net *net)
+{
+ ASSERT_RTNL();
+
+ return net->ipv6.ipmr_seq + ip6mr_rules_seq_read(net);
+}
+
+static int ip6mr_dump(struct net *net, struct notifier_block *nb)
+{
+ return mr_dump(net, nb, RTNL_FAMILY_IP6MR, ip6mr_rules_dump,
+ ip6mr_mr_table_iter, &mrt_lock);
+}
+
+static struct notifier_block ip6_mr_notifier = {
+ .notifier_call = ip6mr_device_event
+};
+
+static const struct fib_notifier_ops ip6mr_notifier_ops_template = {
+ .family = RTNL_FAMILY_IP6MR,
+ .fib_seq_read = ip6mr_seq_read,
+ .fib_dump = ip6mr_dump,
+ .owner = THIS_MODULE,
+};
+
+static int __net_init ip6mr_notifier_init(struct net *net)
+{
+ struct fib_notifier_ops *ops;
+
+ net->ipv6.ipmr_seq = 0;
+
+ ops = fib_notifier_ops_register(&ip6mr_notifier_ops_template, net);
+ if (IS_ERR(ops))
+ return PTR_ERR(ops);
+
+ net->ipv6.ip6mr_notifier_ops = ops;
+
+ return 0;
+}
+
+static void __net_exit ip6mr_notifier_exit(struct net *net)
+{
+ fib_notifier_ops_unregister(net->ipv6.ip6mr_notifier_ops);
+ net->ipv6.ip6mr_notifier_ops = NULL;
+}
+
+/* Setup for IP multicast routing */
+static int __net_init ip6mr_net_init(struct net *net)
+{
+ int err;
+
+ err = ip6mr_notifier_init(net);
+ if (err)
+ return err;
+
+ err = ip6mr_rules_init(net);
+ if (err < 0)
+ goto ip6mr_rules_fail;
+
+#ifdef CONFIG_PROC_FS
+ err = -ENOMEM;
+ if (!proc_create_net("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_seq_ops,
+ sizeof(struct mr_vif_iter)))
+ goto proc_vif_fail;
+ if (!proc_create_net("ip6_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
+ sizeof(struct mr_mfc_iter)))
+ goto proc_cache_fail;
+#endif
+
+ return 0;
+
+#ifdef CONFIG_PROC_FS
+proc_cache_fail:
+ remove_proc_entry("ip6_mr_vif", net->proc_net);
+proc_vif_fail:
+ ip6mr_rules_exit(net);
+#endif
+ip6mr_rules_fail:
+ ip6mr_notifier_exit(net);
+ return err;
+}
+
+static void __net_exit ip6mr_net_exit(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ remove_proc_entry("ip6_mr_cache", net->proc_net);
+ remove_proc_entry("ip6_mr_vif", net->proc_net);
+#endif
+ ip6mr_rules_exit(net);
+ ip6mr_notifier_exit(net);
+}
+
+static struct pernet_operations ip6mr_net_ops = {
+ .init = ip6mr_net_init,
+ .exit = ip6mr_net_exit,
+};
+
+int __init ip6_mr_init(void)
+{
+ int err;
+
+ mrt_cachep = kmem_cache_create("ip6_mrt_cache",
+ sizeof(struct mfc6_cache),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (!mrt_cachep)
+ return -ENOMEM;
+
+ err = register_pernet_subsys(&ip6mr_net_ops);
+ if (err)
+ goto reg_pernet_fail;
+
+ err = register_netdevice_notifier(&ip6_mr_notifier);
+ if (err)
+ goto reg_notif_fail;
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
+ pr_err("%s: can't add PIM protocol\n", __func__);
+ err = -EAGAIN;
+ goto add_proto_fail;
+ }
+#endif
+ err = rtnl_register_module(THIS_MODULE, RTNL_FAMILY_IP6MR, RTM_GETROUTE,
+ NULL, ip6mr_rtm_dumproute, 0);
+ if (err == 0)
+ return 0;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
+add_proto_fail:
+ unregister_netdevice_notifier(&ip6_mr_notifier);
+#endif
+reg_notif_fail:
+ unregister_pernet_subsys(&ip6mr_net_ops);
+reg_pernet_fail:
+ kmem_cache_destroy(mrt_cachep);
+ return err;
+}
+
+void ip6_mr_cleanup(void)
+{
+ rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
+#ifdef CONFIG_IPV6_PIMSM_V2
+ inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
+#endif
+ unregister_netdevice_notifier(&ip6_mr_notifier);
+ unregister_pernet_subsys(&ip6mr_net_ops);
+ kmem_cache_destroy(mrt_cachep);
+}
+
+static int ip6mr_mfc_add(struct net *net, struct mr_table *mrt,
+ struct mf6cctl *mfc, int mrtsock, int parent)
+{
+ unsigned char ttls[MAXMIFS];
+ struct mfc6_cache *uc, *c;
+ struct mr_mfc *_uc;
+ bool found;
+ int i, err;
+
+ if (mfc->mf6cc_parent >= MAXMIFS)
+ return -ENFILE;
+
+ memset(ttls, 255, MAXMIFS);
+ for (i = 0; i < MAXMIFS; i++) {
+ if (IF_ISSET(i, &mfc->mf6cc_ifset))
+ ttls[i] = 1;
+ }
+
+ /* The entries are added/deleted only under RTNL */
+ rcu_read_lock();
+ c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
+ &mfc->mf6cc_mcastgrp.sin6_addr, parent);
+ rcu_read_unlock();
+ if (c) {
+ write_lock_bh(&mrt_lock);
+ c->_c.mfc_parent = mfc->mf6cc_parent;
+ ip6mr_update_thresholds(mrt, &c->_c, ttls);
+ if (!mrtsock)
+ c->_c.mfc_flags |= MFC_STATIC;
+ write_unlock_bh(&mrt_lock);
+ call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE,
+ c, mrt->id);
+ mr6_netlink_event(mrt, c, RTM_NEWROUTE);
+ return 0;
+ }
+
+ if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
+ !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
+ return -EINVAL;
+
+ c = ip6mr_cache_alloc();
+ if (!c)
+ return -ENOMEM;
+
+ c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
+ c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
+ c->_c.mfc_parent = mfc->mf6cc_parent;
+ ip6mr_update_thresholds(mrt, &c->_c, ttls);
+ if (!mrtsock)
+ c->_c.mfc_flags |= MFC_STATIC;
+
+ err = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
+ ip6mr_rht_params);
+ if (err) {
+ pr_err("ip6mr: rhtable insert error %d\n", err);
+ ip6mr_cache_free(c);
+ return err;
+ }
+ list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
+
+ /* Check to see if we resolved a queued list. If so we
+ * need to send on the frames and tidy up.
+ */
+ found = false;
+ spin_lock_bh(&mfc_unres_lock);
+ list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
+ uc = (struct mfc6_cache *)_uc;
+ if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
+ ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
+ list_del(&_uc->list);
+ atomic_dec(&mrt->cache_resolve_queue_len);
+ found = true;
+ break;
+ }
+ }
+ if (list_empty(&mrt->mfc_unres_queue))
+ del_timer(&mrt->ipmr_expire_timer);
+ spin_unlock_bh(&mfc_unres_lock);
+
+ if (found) {
+ ip6mr_cache_resolve(net, mrt, uc, c);
+ ip6mr_cache_free(uc);
+ }
+ call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD,
+ c, mrt->id);
+ mr6_netlink_event(mrt, c, RTM_NEWROUTE);
+ return 0;
+}
+
+/*
+ * Close the multicast socket, and clear the vif tables etc
+ */
+
+static void mroute_clean_tables(struct mr_table *mrt, bool all)
+{
+ struct mr_mfc *c, *tmp;
+ LIST_HEAD(list);
+ int i;
+
+ /* Shut down all active vif entries */
+ for (i = 0; i < mrt->maxvif; i++) {
+ if (!all && (mrt->vif_table[i].flags & VIFF_STATIC))
+ continue;
+ mif6_delete(mrt, i, 0, &list);
+ }
+ unregister_netdevice_many(&list);
+
+ /* Wipe the cache */
+ list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
+ if (!all && (c->mfc_flags & MFC_STATIC))
+ continue;
+ rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params);
+ list_del_rcu(&c->list);
+ mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
+ mr_cache_put(c);
+ }
+
+ if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
+ spin_lock_bh(&mfc_unres_lock);
+ list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
+ list_del(&c->list);
+ call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
+ FIB_EVENT_ENTRY_DEL,
+ (struct mfc6_cache *)c,
+ mrt->id);
+ mr6_netlink_event(mrt, (struct mfc6_cache *)c,
+ RTM_DELROUTE);
+ ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
+ }
+ spin_unlock_bh(&mfc_unres_lock);
+ }
+}
+
+static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk)
+{
+ int err = 0;
+ struct net *net = sock_net(sk);
+
+ rtnl_lock();
+ write_lock_bh(&mrt_lock);
+ if (rtnl_dereference(mrt->mroute_sk)) {
+ err = -EADDRINUSE;
+ } else {
+ rcu_assign_pointer(mrt->mroute_sk, sk);
+ sock_set_flag(sk, SOCK_RCU_FREE);
+ net->ipv6.devconf_all->mc_forwarding++;
+ }
+ write_unlock_bh(&mrt_lock);
+
+ if (!err)
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_MC_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
+ rtnl_unlock();
+
+ return err;
+}
+
+int ip6mr_sk_done(struct sock *sk)
+{
+ int err = -EACCES;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ if (sk->sk_type != SOCK_RAW ||
+ inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return err;
+
+ rtnl_lock();
+ ip6mr_for_each_table(mrt, net) {
+ if (sk == rtnl_dereference(mrt->mroute_sk)) {
+ write_lock_bh(&mrt_lock);
+ RCU_INIT_POINTER(mrt->mroute_sk, NULL);
+ /* Note that mroute_sk had SOCK_RCU_FREE set,
+ * so the RCU grace period before sk freeing
+ * is guaranteed by sk_destruct()
+ */
+ net->ipv6.devconf_all->mc_forwarding--;
+ write_unlock_bh(&mrt_lock);
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_MC_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
+
+ mroute_clean_tables(mrt, false);
+ err = 0;
+ break;
+ }
+ }
+ rtnl_unlock();
+
+ return err;
+}
+
+bool mroute6_is_socket(struct net *net, struct sk_buff *skb)
+{
+ struct mr_table *mrt;
+ struct flowi6 fl6 = {
+ .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
+ .flowi6_oif = skb->dev->ifindex,
+ .flowi6_mark = skb->mark,
+ };
+
+ if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
+ return NULL;
+
+ return rcu_access_pointer(mrt->mroute_sk);
+}
+EXPORT_SYMBOL(mroute6_is_socket);
+
+/*
+ * Socket options and virtual interface manipulation. The whole
+ * virtual interface system is a complete heap, but unfortunately
+ * that's how BSD mrouted happens to think. Maybe one day with a proper
+ * MOSPF/PIM router set up we can clean this up.
+ */
+
+int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
+{
+ int ret, parent = 0;
+ struct mif6ctl vif;
+ struct mf6cctl mfc;
+ mifi_t mifi;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ if (sk->sk_type != SOCK_RAW ||
+ inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+
+ mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+ if (!mrt)
+ return -ENOENT;
+
+ if (optname != MRT6_INIT) {
+ if (sk != rcu_access_pointer(mrt->mroute_sk) &&
+ !ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EACCES;
+ }
+
+ switch (optname) {
+ case MRT6_INIT:
+ if (optlen < sizeof(int))
+ return -EINVAL;
+
+ return ip6mr_sk_init(mrt, sk);
+
+ case MRT6_DONE:
+ return ip6mr_sk_done(sk);
+
+ case MRT6_ADD_MIF:
+ if (optlen < sizeof(vif))
+ return -EINVAL;
+ if (copy_from_user(&vif, optval, sizeof(vif)))
+ return -EFAULT;
+ if (vif.mif6c_mifi >= MAXMIFS)
+ return -ENFILE;
+ rtnl_lock();
+ ret = mif6_add(net, mrt, &vif,
+ sk == rtnl_dereference(mrt->mroute_sk));
+ rtnl_unlock();
+ return ret;
+
+ case MRT6_DEL_MIF:
+ if (optlen < sizeof(mifi_t))
+ return -EINVAL;
+ if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
+ return -EFAULT;
+ rtnl_lock();
+ ret = mif6_delete(mrt, mifi, 0, NULL);
+ rtnl_unlock();
+ return ret;
+
+ /*
+ * Manipulate the forwarding caches. These live
+ * in a sort of kernel/user symbiosis.
+ */
+ case MRT6_ADD_MFC:
+ case MRT6_DEL_MFC:
+ parent = -1;
+ /* fall through */
+ case MRT6_ADD_MFC_PROXY:
+ case MRT6_DEL_MFC_PROXY:
+ if (optlen < sizeof(mfc))
+ return -EINVAL;
+ if (copy_from_user(&mfc, optval, sizeof(mfc)))
+ return -EFAULT;
+ if (parent == 0)
+ parent = mfc.mf6cc_parent;
+ rtnl_lock();
+ if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
+ ret = ip6mr_mfc_delete(mrt, &mfc, parent);
+ else
+ ret = ip6mr_mfc_add(net, mrt, &mfc,
+ sk ==
+ rtnl_dereference(mrt->mroute_sk),
+ parent);
+ rtnl_unlock();
+ return ret;
+
+ /*
+ * Control PIM assert (to activate pim will activate assert)
+ */
+ case MRT6_ASSERT:
+ {
+ int v;
+
+ if (optlen != sizeof(v))
+ return -EINVAL;
+ if (get_user(v, (int __user *)optval))
+ return -EFAULT;
+ mrt->mroute_do_assert = v;
+ return 0;
+ }
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ case MRT6_PIM:
+ {
+ int v;
+
+ if (optlen != sizeof(v))
+ return -EINVAL;
+ if (get_user(v, (int __user *)optval))
+ return -EFAULT;
+ v = !!v;
+ rtnl_lock();
+ ret = 0;
+ if (v != mrt->mroute_do_pim) {
+ mrt->mroute_do_pim = v;
+ mrt->mroute_do_assert = v;
+ }
+ rtnl_unlock();
+ return ret;
+ }
+
+#endif
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+ case MRT6_TABLE:
+ {
+ u32 v;
+
+ if (optlen != sizeof(u32))
+ return -EINVAL;
+ if (get_user(v, (u32 __user *)optval))
+ return -EFAULT;
+ /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
+ if (v != RT_TABLE_DEFAULT && v >= 100000000)
+ return -EINVAL;
+ if (sk == rcu_access_pointer(mrt->mroute_sk))
+ return -EBUSY;
+
+ rtnl_lock();
+ ret = 0;
+ mrt = ip6mr_new_table(net, v);
+ if (IS_ERR(mrt))
+ ret = PTR_ERR(mrt);
+ else
+ raw6_sk(sk)->ip6mr_table = v;
+ rtnl_unlock();
+ return ret;
+ }
+#endif
+ /*
+ * Spurious command, or MRT6_VERSION which you cannot
+ * set.
+ */
+ default:
+ return -ENOPROTOOPT;
+ }
+}
+
+/*
+ * Getsock opt support for the multicast routing system.
+ */
+
+int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
+ int __user *optlen)
+{
+ int olr;
+ int val;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ if (sk->sk_type != SOCK_RAW ||
+ inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+
+ mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+ if (!mrt)
+ return -ENOENT;
+
+ switch (optname) {
+ case MRT6_VERSION:
+ val = 0x0305;
+ break;
+#ifdef CONFIG_IPV6_PIMSM_V2
+ case MRT6_PIM:
+ val = mrt->mroute_do_pim;
+ break;
+#endif
+ case MRT6_ASSERT:
+ val = mrt->mroute_do_assert;
+ break;
+ default:
+ return -ENOPROTOOPT;
+ }
+
+ if (get_user(olr, optlen))
+ return -EFAULT;
+
+ olr = min_t(int, olr, sizeof(int));
+ if (olr < 0)
+ return -EINVAL;
+
+ if (put_user(olr, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &val, olr))
+ return -EFAULT;
+ return 0;
+}
+
+/*
+ * The IP multicast ioctl support routines.
+ */
+
+int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
+{
+ struct sioc_sg_req6 sr;
+ struct sioc_mif_req6 vr;
+ struct vif_device *vif;
+ struct mfc6_cache *c;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+ if (!mrt)
+ return -ENOENT;
+
+ switch (cmd) {
+ case SIOCGETMIFCNT_IN6:
+ if (copy_from_user(&vr, arg, sizeof(vr)))
+ return -EFAULT;
+ if (vr.mifi >= mrt->maxvif)
+ return -EINVAL;
+ read_lock(&mrt_lock);
+ vif = &mrt->vif_table[vr.mifi];
+ if (VIF_EXISTS(mrt, vr.mifi)) {
+ vr.icount = vif->pkt_in;
+ vr.ocount = vif->pkt_out;
+ vr.ibytes = vif->bytes_in;
+ vr.obytes = vif->bytes_out;
+ read_unlock(&mrt_lock);
+
+ if (copy_to_user(arg, &vr, sizeof(vr)))
+ return -EFAULT;
+ return 0;
+ }
+ read_unlock(&mrt_lock);
+ return -EADDRNOTAVAIL;
+ case SIOCGETSGCNT_IN6:
+ if (copy_from_user(&sr, arg, sizeof(sr)))
+ return -EFAULT;
+
+ rcu_read_lock();
+ c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
+ if (c) {
+ sr.pktcnt = c->_c.mfc_un.res.pkt;
+ sr.bytecnt = c->_c.mfc_un.res.bytes;
+ sr.wrong_if = c->_c.mfc_un.res.wrong_if;
+ rcu_read_unlock();
+
+ if (copy_to_user(arg, &sr, sizeof(sr)))
+ return -EFAULT;
+ return 0;
+ }
+ rcu_read_unlock();
+ return -EADDRNOTAVAIL;
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_sioc_sg_req6 {
+ struct sockaddr_in6 src;
+ struct sockaddr_in6 grp;
+ compat_ulong_t pktcnt;
+ compat_ulong_t bytecnt;
+ compat_ulong_t wrong_if;
+};
+
+struct compat_sioc_mif_req6 {
+ mifi_t mifi;
+ compat_ulong_t icount;
+ compat_ulong_t ocount;
+ compat_ulong_t ibytes;
+ compat_ulong_t obytes;
+};
+
+int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
+{
+ struct compat_sioc_sg_req6 sr;
+ struct compat_sioc_mif_req6 vr;
+ struct vif_device *vif;
+ struct mfc6_cache *c;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+ if (!mrt)
+ return -ENOENT;
+
+ switch (cmd) {
+ case SIOCGETMIFCNT_IN6:
+ if (copy_from_user(&vr, arg, sizeof(vr)))
+ return -EFAULT;
+ if (vr.mifi >= mrt->maxvif)
+ return -EINVAL;
+ read_lock(&mrt_lock);
+ vif = &mrt->vif_table[vr.mifi];
+ if (VIF_EXISTS(mrt, vr.mifi)) {
+ vr.icount = vif->pkt_in;
+ vr.ocount = vif->pkt_out;
+ vr.ibytes = vif->bytes_in;
+ vr.obytes = vif->bytes_out;
+ read_unlock(&mrt_lock);
+
+ if (copy_to_user(arg, &vr, sizeof(vr)))
+ return -EFAULT;
+ return 0;
+ }
+ read_unlock(&mrt_lock);
+ return -EADDRNOTAVAIL;
+ case SIOCGETSGCNT_IN6:
+ if (copy_from_user(&sr, arg, sizeof(sr)))
+ return -EFAULT;
+
+ rcu_read_lock();
+ c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
+ if (c) {
+ sr.pktcnt = c->_c.mfc_un.res.pkt;
+ sr.bytecnt = c->_c.mfc_un.res.bytes;
+ sr.wrong_if = c->_c.mfc_un.res.wrong_if;
+ rcu_read_unlock();
+
+ if (copy_to_user(arg, &sr, sizeof(sr)))
+ return -EFAULT;
+ return 0;
+ }
+ rcu_read_unlock();
+ return -EADDRNOTAVAIL;
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+#endif
+
+static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_OUTFORWDATAGRAMS);
+ __IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_OUTOCTETS, skb->len);
+ return dst_output(net, sk, skb);
+}
+
+/*
+ * Processing handlers for ip6mr_forward
+ */
+
+static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
+ struct sk_buff *skb, struct mfc6_cache *c, int vifi)
+{
+ struct ipv6hdr *ipv6h;
+ struct vif_device *vif = &mrt->vif_table[vifi];
+ struct net_device *dev;
+ struct dst_entry *dst;
+ struct flowi6 fl6;
+
+ if (!vif->dev)
+ goto out_free;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (vif->flags & MIFF_REGISTER) {
+ vif->pkt_out++;
+ vif->bytes_out += skb->len;
+ vif->dev->stats.tx_bytes += skb->len;
+ vif->dev->stats.tx_packets++;
+ ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
+ goto out_free;
+ }
+#endif
+
+ ipv6h = ipv6_hdr(skb);
+
+ fl6 = (struct flowi6) {
+ .flowi6_oif = vif->link,
+ .daddr = ipv6h->daddr,
+ };
+
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (dst->error) {
+ dst_release(dst);
+ goto out_free;
+ }
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst);
+
+ /*
+ * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
+ * not only before forwarding, but after forwarding on all output
+ * interfaces. It is clear, if mrouter runs a multicasting
+ * program, it should receive packets not depending to what interface
+ * program is joined.
+ * If we will not make it, the program will have to join on all
+ * interfaces. On the other hand, multihoming host (or router, but
+ * not mrouter) cannot join to more than one interface - it will
+ * result in receiving multiple packets.
+ */
+ dev = vif->dev;
+ skb->dev = dev;
+ vif->pkt_out++;
+ vif->bytes_out += skb->len;
+
+ /* We are about to write */
+ /* XXX: extension headers? */
+ if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
+ goto out_free;
+
+ ipv6h = ipv6_hdr(skb);
+ ipv6h->hop_limit--;
+
+ IP6CB(skb)->flags |= IP6SKB_FORWARDED;
+
+ return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
+ net, NULL, skb, skb->dev, dev,
+ ip6mr_forward2_finish);
+
+out_free:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int ip6mr_find_vif(struct mr_table *mrt, struct net_device *dev)
+{
+ int ct;
+
+ for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
+ if (mrt->vif_table[ct].dev == dev)
+ break;
+ }
+ return ct;
+}
+
+static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
+ struct sk_buff *skb, struct mfc6_cache *c)
+{
+ int psend = -1;
+ int vif, ct;
+ int true_vifi = ip6mr_find_vif(mrt, skb->dev);
+
+ vif = c->_c.mfc_parent;
+ c->_c.mfc_un.res.pkt++;
+ c->_c.mfc_un.res.bytes += skb->len;
+ c->_c.mfc_un.res.lastuse = jiffies;
+
+ if (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) {
+ struct mfc6_cache *cache_proxy;
+
+ /* For an (*,G) entry, we only check that the incoming
+ * interface is part of the static tree.
+ */
+ rcu_read_lock();
+ cache_proxy = mr_mfc_find_any_parent(mrt, vif);
+ if (cache_proxy &&
+ cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) {
+ rcu_read_unlock();
+ goto forward;
+ }
+ rcu_read_unlock();
+ }
+
+ /*
+ * Wrong interface: drop packet and (maybe) send PIM assert.
+ */
+ if (mrt->vif_table[vif].dev != skb->dev) {
+ c->_c.mfc_un.res.wrong_if++;
+
+ if (true_vifi >= 0 && mrt->mroute_do_assert &&
+ /* pimsm uses asserts, when switching from RPT to SPT,
+ so that we cannot check that packet arrived on an oif.
+ It is bad, but otherwise we would need to move pretty
+ large chunk of pimd to kernel. Ough... --ANK
+ */
+ (mrt->mroute_do_pim ||
+ c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
+ time_after(jiffies,
+ c->_c.mfc_un.res.last_assert +
+ MFC_ASSERT_THRESH)) {
+ c->_c.mfc_un.res.last_assert = jiffies;
+ ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
+ }
+ goto dont_forward;
+ }
+
+forward:
+ mrt->vif_table[vif].pkt_in++;
+ mrt->vif_table[vif].bytes_in += skb->len;
+
+ /*
+ * Forward the frame
+ */
+ if (ipv6_addr_any(&c->mf6c_origin) &&
+ ipv6_addr_any(&c->mf6c_mcastgrp)) {
+ if (true_vifi >= 0 &&
+ true_vifi != c->_c.mfc_parent &&
+ ipv6_hdr(skb)->hop_limit >
+ c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
+ /* It's an (*,*) entry and the packet is not coming from
+ * the upstream: forward the packet to the upstream
+ * only.
+ */
+ psend = c->_c.mfc_parent;
+ goto last_forward;
+ }
+ goto dont_forward;
+ }
+ for (ct = c->_c.mfc_un.res.maxvif - 1;
+ ct >= c->_c.mfc_un.res.minvif; ct--) {
+ /* For (*,G) entry, don't forward to the incoming interface */
+ if ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) &&
+ ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) {
+ if (psend != -1) {
+ struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (skb2)
+ ip6mr_forward2(net, mrt, skb2,
+ c, psend);
+ }
+ psend = ct;
+ }
+ }
+last_forward:
+ if (psend != -1) {
+ ip6mr_forward2(net, mrt, skb, c, psend);
+ return;
+ }
+
+dont_forward:
+ kfree_skb(skb);
+}
+
+
+/*
+ * Multicast packets for forwarding arrive here
+ */
+
+int ip6_mr_input(struct sk_buff *skb)
+{
+ struct mfc6_cache *cache;
+ struct net *net = dev_net(skb->dev);
+ struct mr_table *mrt;
+ struct flowi6 fl6 = {
+ .flowi6_iif = skb->dev->ifindex,
+ .flowi6_mark = skb->mark,
+ };
+ int err;
+
+ err = ip6mr_fib_lookup(net, &fl6, &mrt);
+ if (err < 0) {
+ kfree_skb(skb);
+ return err;
+ }
+
+ read_lock(&mrt_lock);
+ cache = ip6mr_cache_find(mrt,
+ &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
+ if (!cache) {
+ int vif = ip6mr_find_vif(mrt, skb->dev);
+
+ if (vif >= 0)
+ cache = ip6mr_cache_find_any(mrt,
+ &ipv6_hdr(skb)->daddr,
+ vif);
+ }
+
+ /*
+ * No usable cache entry
+ */
+ if (!cache) {
+ int vif;
+
+ vif = ip6mr_find_vif(mrt, skb->dev);
+ if (vif >= 0) {
+ int err = ip6mr_cache_unresolved(mrt, vif, skb);
+ read_unlock(&mrt_lock);
+
+ return err;
+ }
+ read_unlock(&mrt_lock);
+ kfree_skb(skb);
+ return -ENODEV;
+ }
+
+ ip6_mr_forward(net, mrt, skb, cache);
+
+ read_unlock(&mrt_lock);
+
+ return 0;
+}
+
+int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
+ u32 portid)
+{
+ int err;
+ struct mr_table *mrt;
+ struct mfc6_cache *cache;
+ struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
+
+ mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
+ if (!mrt)
+ return -ENOENT;
+
+ read_lock(&mrt_lock);
+ cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
+ if (!cache && skb->dev) {
+ int vif = ip6mr_find_vif(mrt, skb->dev);
+
+ if (vif >= 0)
+ cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
+ vif);
+ }
+
+ if (!cache) {
+ struct sk_buff *skb2;
+ struct ipv6hdr *iph;
+ struct net_device *dev;
+ int vif;
+
+ dev = skb->dev;
+ if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
+ read_unlock(&mrt_lock);
+ return -ENODEV;
+ }
+
+ /* really correct? */
+ skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
+ if (!skb2) {
+ read_unlock(&mrt_lock);
+ return -ENOMEM;
+ }
+
+ NETLINK_CB(skb2).portid = portid;
+ skb_reset_transport_header(skb2);
+
+ skb_put(skb2, sizeof(struct ipv6hdr));
+ skb_reset_network_header(skb2);
+
+ iph = ipv6_hdr(skb2);
+ iph->version = 0;
+ iph->priority = 0;
+ iph->flow_lbl[0] = 0;
+ iph->flow_lbl[1] = 0;
+ iph->flow_lbl[2] = 0;
+ iph->payload_len = 0;
+ iph->nexthdr = IPPROTO_NONE;
+ iph->hop_limit = 0;
+ iph->saddr = rt->rt6i_src.addr;
+ iph->daddr = rt->rt6i_dst.addr;
+
+ err = ip6mr_cache_unresolved(mrt, vif, skb2);
+ read_unlock(&mrt_lock);
+
+ return err;
+ }
+
+ err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
+ read_unlock(&mrt_lock);
+ return err;
+}
+
+static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
+ u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
+ int flags)
+{
+ struct nlmsghdr *nlh;
+ struct rtmsg *rtm;
+ int err;
+
+ nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ rtm = nlmsg_data(nlh);
+ rtm->rtm_family = RTNL_FAMILY_IP6MR;
+ rtm->rtm_dst_len = 128;
+ rtm->rtm_src_len = 128;
+ rtm->rtm_tos = 0;
+ rtm->rtm_table = mrt->id;
+ if (nla_put_u32(skb, RTA_TABLE, mrt->id))
+ goto nla_put_failure;
+ rtm->rtm_type = RTN_MULTICAST;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ if (c->_c.mfc_flags & MFC_STATIC)
+ rtm->rtm_protocol = RTPROT_STATIC;
+ else
+ rtm->rtm_protocol = RTPROT_MROUTED;
+ rtm->rtm_flags = 0;
+
+ if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
+ nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
+ goto nla_put_failure;
+ err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
+ /* do not break the dump if cache is unresolved */
+ if (err < 0 && err != -ENOENT)
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
+ u32 portid, u32 seq, struct mr_mfc *c,
+ int cmd, int flags)
+{
+ return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c,
+ cmd, flags);
+}
+
+static int mr6_msgsize(bool unresolved, int maxvif)
+{
+ size_t len =
+ NLMSG_ALIGN(sizeof(struct rtmsg))
+ + nla_total_size(4) /* RTA_TABLE */
+ + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
+ + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
+ ;
+
+ if (!unresolved)
+ len = len
+ + nla_total_size(4) /* RTA_IIF */
+ + nla_total_size(0) /* RTA_MULTIPATH */
+ + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
+ /* RTA_MFC_STATS */
+ + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
+ ;
+
+ return len;
+}
+
+static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
+ int cmd)
+{
+ struct net *net = read_pnet(&mrt->net);
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif),
+ GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
+ if (err < 0)
+ goto errout;
+
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
+ return;
+
+errout:
+ kfree_skb(skb);
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
+}
+
+static size_t mrt6msg_netlink_msgsize(size_t payloadlen)
+{
+ size_t len =
+ NLMSG_ALIGN(sizeof(struct rtgenmsg))
+ + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */
+ + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */
+ /* IP6MRA_CREPORT_SRC_ADDR */
+ + nla_total_size(sizeof(struct in6_addr))
+ /* IP6MRA_CREPORT_DST_ADDR */
+ + nla_total_size(sizeof(struct in6_addr))
+ /* IP6MRA_CREPORT_PKT */
+ + nla_total_size(payloadlen)
+ ;
+
+ return len;
+}
+
+static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
+{
+ struct net *net = read_pnet(&mrt->net);
+ struct nlmsghdr *nlh;
+ struct rtgenmsg *rtgenm;
+ struct mrt6msg *msg;
+ struct sk_buff *skb;
+ struct nlattr *nla;
+ int payloadlen;
+
+ payloadlen = pkt->len - sizeof(struct mrt6msg);
+ msg = (struct mrt6msg *)skb_transport_header(pkt);
+
+ skb = nlmsg_new(mrt6msg_netlink_msgsize(payloadlen), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
+ sizeof(struct rtgenmsg), 0);
+ if (!nlh)
+ goto errout;
+ rtgenm = nlmsg_data(nlh);
+ rtgenm->rtgen_family = RTNL_FAMILY_IP6MR;
+ if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) ||
+ nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) ||
+ nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR,
+ &msg->im6_src) ||
+ nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR,
+ &msg->im6_dst))
+ goto nla_put_failure;
+
+ nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen);
+ if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg),
+ nla_data(nla), payloadlen))
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC);
+ return;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+errout:
+ kfree_skb(skb);
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS);
+}
+
+static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter,
+ _ip6mr_fill_mroute, &mfc_unres_lock);
+}
diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
new file mode 100644
index 0000000..54d165b
--- /dev/null
+++ b/net/ipv6/ipcomp6.c
@@ -0,0 +1,231 @@
+/*
+ * IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173
+ *
+ * Copyright (C)2003 USAGI/WIDE Project
+ *
+ * Author Mitsuru KANDA <mk@linux-ipv6.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * [Memo]
+ *
+ * Outbound:
+ * The compression of IP datagram MUST be done before AH/ESP processing,
+ * fragmentation, and the addition of Hop-by-Hop/Routing header.
+ *
+ * Inbound:
+ * The decompression of IP datagram MUST be done after the reassembly,
+ * AH/ESP processing.
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/module.h>
+#include <net/ip.h>
+#include <net/xfrm.h>
+#include <net/ipcomp.h>
+#include <linux/crypto.h>
+#include <linux/err.h>
+#include <linux/pfkeyv2.h>
+#include <linux/random.h>
+#include <linux/percpu.h>
+#include <linux/smp.h>
+#include <linux/list.h>
+#include <linux/vmalloc.h>
+#include <linux/rtnetlink.h>
+#include <net/ip6_route.h>
+#include <net/icmp.h>
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/mutex.h>
+
+static int ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct net *net = dev_net(skb->dev);
+ __be32 spi;
+ const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
+ struct ip_comp_hdr *ipcomph =
+ (struct ip_comp_hdr *)(skb->data + offset);
+ struct xfrm_state *x;
+
+ if (type != ICMPV6_PKT_TOOBIG &&
+ type != NDISC_REDIRECT)
+ return 0;
+
+ spi = htonl(ntohs(ipcomph->cpi));
+ x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
+ spi, IPPROTO_COMP, AF_INET6);
+ if (!x)
+ return 0;
+
+ if (type == NDISC_REDIRECT)
+ ip6_redirect(skb, net, skb->dev->ifindex, 0,
+ sock_net_uid(net, NULL));
+ else
+ ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
+ xfrm_state_put(x);
+
+ return 0;
+}
+
+static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
+{
+ struct net *net = xs_net(x);
+ struct xfrm_state *t = NULL;
+
+ t = xfrm_state_alloc(net);
+ if (!t)
+ goto out;
+
+ t->id.proto = IPPROTO_IPV6;
+ t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr);
+ if (!t->id.spi)
+ goto error;
+
+ memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
+ memcpy(&t->sel, &x->sel, sizeof(t->sel));
+ t->props.family = AF_INET6;
+ t->props.mode = x->props.mode;
+ memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
+ memcpy(&t->mark, &x->mark, sizeof(t->mark));
+
+ if (xfrm_init_state(t))
+ goto error;
+
+ atomic_set(&t->tunnel_users, 1);
+
+out:
+ return t;
+
+error:
+ t->km.state = XFRM_STATE_DEAD;
+ xfrm_state_put(t);
+ t = NULL;
+ goto out;
+}
+
+static int ipcomp6_tunnel_attach(struct xfrm_state *x)
+{
+ struct net *net = xs_net(x);
+ int err = 0;
+ struct xfrm_state *t = NULL;
+ __be32 spi;
+ u32 mark = x->mark.m & x->mark.v;
+
+ spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr);
+ if (spi)
+ t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr,
+ spi, IPPROTO_IPV6, AF_INET6);
+ if (!t) {
+ t = ipcomp6_tunnel_create(x);
+ if (!t) {
+ err = -EINVAL;
+ goto out;
+ }
+ xfrm_state_insert(t);
+ xfrm_state_hold(t);
+ }
+ x->tunnel = t;
+ atomic_inc(&t->tunnel_users);
+
+out:
+ return err;
+}
+
+static int ipcomp6_init_state(struct xfrm_state *x)
+{
+ int err = -EINVAL;
+
+ x->props.header_len = 0;
+ switch (x->props.mode) {
+ case XFRM_MODE_TRANSPORT:
+ break;
+ case XFRM_MODE_TUNNEL:
+ x->props.header_len += sizeof(struct ipv6hdr);
+ break;
+ default:
+ goto out;
+ }
+
+ err = ipcomp_init_state(x);
+ if (err)
+ goto out;
+
+ if (x->props.mode == XFRM_MODE_TUNNEL) {
+ err = ipcomp6_tunnel_attach(x);
+ if (err)
+ goto out;
+ }
+
+ err = 0;
+out:
+ return err;
+}
+
+static int ipcomp6_rcv_cb(struct sk_buff *skb, int err)
+{
+ return 0;
+}
+
+static const struct xfrm_type ipcomp6_type = {
+ .description = "IPCOMP6",
+ .owner = THIS_MODULE,
+ .proto = IPPROTO_COMP,
+ .init_state = ipcomp6_init_state,
+ .destructor = ipcomp_destroy,
+ .input = ipcomp_input,
+ .output = ipcomp_output,
+ .hdr_offset = xfrm6_find_1stfragopt,
+};
+
+static struct xfrm6_protocol ipcomp6_protocol = {
+ .handler = xfrm6_rcv,
+ .cb_handler = ipcomp6_rcv_cb,
+ .err_handler = ipcomp6_err,
+ .priority = 0,
+};
+
+static int __init ipcomp6_init(void)
+{
+ if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) {
+ pr_info("%s: can't add xfrm type\n", __func__);
+ return -EAGAIN;
+ }
+ if (xfrm6_protocol_register(&ipcomp6_protocol, IPPROTO_COMP) < 0) {
+ pr_info("%s: can't add protocol\n", __func__);
+ xfrm_unregister_type(&ipcomp6_type, AF_INET6);
+ return -EAGAIN;
+ }
+ return 0;
+}
+
+static void __exit ipcomp6_fini(void)
+{
+ if (xfrm6_protocol_deregister(&ipcomp6_protocol, IPPROTO_COMP) < 0)
+ pr_info("%s: can't remove protocol\n", __func__);
+ if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0)
+ pr_info("%s: can't remove xfrm type\n", __func__);
+}
+
+module_init(ipcomp6_init);
+module_exit(ipcomp6_fini);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173");
+MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>");
+
+MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP);
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
new file mode 100644
index 0000000..c0cac9c
--- /dev/null
+++ b/net/ipv6/ipv6_sockglue.c
@@ -0,0 +1,1428 @@
+/*
+ * IPv6 BSD socket options interface
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Based on linux/net/ipv4/ip_sockglue.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * FIXME: Make the setsockopt code POSIX compliant: That is
+ *
+ * o Truncate getsockopt returns
+ * o Return an optlen of the truncated length if need be
+ *
+ * Changes:
+ * David L Stevens <dlstevens@us.ibm.com>:
+ * - added multicast source filtering API for MLDv2
+ */
+
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/mroute6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/netfilter.h>
+#include <linux/slab.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/inet_common.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <net/udplite.h>
+#include <net/xfrm.h>
+#include <net/compat.h>
+#include <net/seg6.h>
+
+#include <linux/uaccess.h>
+
+struct ip6_ra_chain *ip6_ra_chain;
+DEFINE_RWLOCK(ip6_ra_lock);
+
+int ip6_ra_control(struct sock *sk, int sel)
+{
+ struct ip6_ra_chain *ra, *new_ra, **rap;
+
+ /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
+ if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
+ return -ENOPROTOOPT;
+
+ new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
+
+ write_lock_bh(&ip6_ra_lock);
+ for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
+ if (ra->sk == sk) {
+ if (sel >= 0) {
+ write_unlock_bh(&ip6_ra_lock);
+ kfree(new_ra);
+ return -EADDRINUSE;
+ }
+
+ *rap = ra->next;
+ write_unlock_bh(&ip6_ra_lock);
+
+ sock_put(sk);
+ kfree(ra);
+ return 0;
+ }
+ }
+ if (!new_ra) {
+ write_unlock_bh(&ip6_ra_lock);
+ return -ENOBUFS;
+ }
+ new_ra->sk = sk;
+ new_ra->sel = sel;
+ new_ra->next = ra;
+ *rap = new_ra;
+ sock_hold(sk);
+ write_unlock_bh(&ip6_ra_lock);
+ return 0;
+}
+
+struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
+ struct ipv6_txoptions *opt)
+{
+ if (inet_sk(sk)->is_icsk) {
+ if (opt &&
+ !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
+ inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
+ struct inet_connection_sock *icsk = inet_csk(sk);
+ icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
+ icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
+ }
+ }
+ opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
+ opt);
+ sk_dst_reset(sk);
+
+ return opt;
+}
+
+static bool setsockopt_needs_rtnl(int optname)
+{
+ switch (optname) {
+ case IPV6_ADDRFORM:
+ case IPV6_ADD_MEMBERSHIP:
+ case IPV6_DROP_MEMBERSHIP:
+ case IPV6_JOIN_ANYCAST:
+ case IPV6_LEAVE_ANYCAST:
+ case MCAST_JOIN_GROUP:
+ case MCAST_LEAVE_GROUP:
+ case MCAST_JOIN_SOURCE_GROUP:
+ case MCAST_LEAVE_SOURCE_GROUP:
+ case MCAST_BLOCK_SOURCE:
+ case MCAST_UNBLOCK_SOURCE:
+ case MCAST_MSFILTER:
+ return true;
+ }
+ return false;
+}
+
+static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct net *net = sock_net(sk);
+ int val, valbool;
+ int retv = -ENOPROTOOPT;
+ bool needs_rtnl = setsockopt_needs_rtnl(optname);
+
+ if (!optval)
+ val = 0;
+ else {
+ if (optlen >= sizeof(int)) {
+ if (get_user(val, (int __user *) optval))
+ return -EFAULT;
+ } else
+ val = 0;
+ }
+
+ valbool = (val != 0);
+
+ if (ip6_mroute_opt(optname))
+ return ip6_mroute_setsockopt(sk, optname, optval, optlen);
+
+ if (needs_rtnl)
+ rtnl_lock();
+ lock_sock(sk);
+
+ switch (optname) {
+
+ case IPV6_ADDRFORM:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ if (val == PF_INET) {
+ struct ipv6_txoptions *opt;
+ struct sk_buff *pktopt;
+
+ if (sk->sk_type == SOCK_RAW)
+ break;
+
+ if (sk->sk_protocol == IPPROTO_UDP ||
+ sk->sk_protocol == IPPROTO_UDPLITE) {
+ struct udp_sock *up = udp_sk(sk);
+ if (up->pending == AF_INET6) {
+ retv = -EBUSY;
+ break;
+ }
+ } else if (sk->sk_protocol != IPPROTO_TCP)
+ break;
+
+ if (sk->sk_state != TCP_ESTABLISHED) {
+ retv = -ENOTCONN;
+ break;
+ }
+
+ if (ipv6_only_sock(sk) ||
+ !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
+ retv = -EADDRNOTAVAIL;
+ break;
+ }
+
+ fl6_free_socklist(sk);
+ __ipv6_sock_mc_close(sk);
+
+ /*
+ * Sock is moving from IPv6 to IPv4 (sk_prot), so
+ * remove it from the refcnt debug socks count in the
+ * original family...
+ */
+ sk_refcnt_debug_dec(sk);
+
+ if (sk->sk_protocol == IPPROTO_TCP) {
+ struct inet_connection_sock *icsk = inet_csk(sk);
+ local_bh_disable();
+ sock_prot_inuse_add(net, sk->sk_prot, -1);
+ sock_prot_inuse_add(net, &tcp_prot, 1);
+ local_bh_enable();
+ sk->sk_prot = &tcp_prot;
+ icsk->icsk_af_ops = &ipv4_specific;
+ sk->sk_socket->ops = &inet_stream_ops;
+ sk->sk_family = PF_INET;
+ tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
+ } else {
+ struct proto *prot = &udp_prot;
+
+ if (sk->sk_protocol == IPPROTO_UDPLITE)
+ prot = &udplite_prot;
+ local_bh_disable();
+ sock_prot_inuse_add(net, sk->sk_prot, -1);
+ sock_prot_inuse_add(net, prot, 1);
+ local_bh_enable();
+ sk->sk_prot = prot;
+ sk->sk_socket->ops = &inet_dgram_ops;
+ sk->sk_family = PF_INET;
+ }
+ opt = xchg((__force struct ipv6_txoptions **)&np->opt,
+ NULL);
+ if (opt) {
+ atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
+ txopt_put(opt);
+ }
+ pktopt = xchg(&np->pktoptions, NULL);
+ kfree_skb(pktopt);
+
+ /*
+ * ... and add it to the refcnt debug socks count
+ * in the new family. -acme
+ */
+ sk_refcnt_debug_inc(sk);
+ module_put(THIS_MODULE);
+ retv = 0;
+ break;
+ }
+ goto e_inval;
+
+ case IPV6_V6ONLY:
+ if (optlen < sizeof(int) ||
+ inet_sk(sk)->inet_num)
+ goto e_inval;
+ sk->sk_ipv6only = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_RECVPKTINFO:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.rxinfo = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_2292PKTINFO:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.rxoinfo = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_RECVHOPLIMIT:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.rxhlim = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_2292HOPLIMIT:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.rxohlim = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_RECVRTHDR:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.srcrt = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_2292RTHDR:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.osrcrt = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_RECVHOPOPTS:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.hopopts = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_2292HOPOPTS:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.ohopopts = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_RECVDSTOPTS:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.dstopts = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_2292DSTOPTS:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.odstopts = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_TCLASS:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ if (val < -1 || val > 0xff)
+ goto e_inval;
+ /* RFC 3542, 6.5: default traffic class of 0x0 */
+ if (val == -1)
+ val = 0;
+ np->tclass = val;
+ retv = 0;
+ break;
+
+ case IPV6_RECVTCLASS:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.rxtclass = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_FLOWINFO:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.rxflow = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_RECVPATHMTU:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.rxpmtu = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_TRANSPARENT:
+ if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
+ !ns_capable(net->user_ns, CAP_NET_RAW)) {
+ retv = -EPERM;
+ break;
+ }
+ if (optlen < sizeof(int))
+ goto e_inval;
+ /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
+ inet_sk(sk)->transparent = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_FREEBIND:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ /* we also don't have a separate freebind bit for IPV6 */
+ inet_sk(sk)->freebind = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_RECVORIGDSTADDR:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.rxorigdstaddr = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_HOPOPTS:
+ case IPV6_RTHDRDSTOPTS:
+ case IPV6_RTHDR:
+ case IPV6_DSTOPTS:
+ {
+ struct ipv6_txoptions *opt;
+ struct ipv6_opt_hdr *new = NULL;
+
+ /* hop-by-hop / destination options are privileged option */
+ retv = -EPERM;
+ if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
+ break;
+
+ /* remove any sticky options header with a zero option
+ * length, per RFC3542.
+ */
+ if (optlen == 0)
+ optval = NULL;
+ else if (!optval)
+ goto e_inval;
+ else if (optlen < sizeof(struct ipv6_opt_hdr) ||
+ optlen & 0x7 || optlen > 8 * 255)
+ goto e_inval;
+ else {
+ new = memdup_user(optval, optlen);
+ if (IS_ERR(new)) {
+ retv = PTR_ERR(new);
+ break;
+ }
+ if (unlikely(ipv6_optlen(new) > optlen)) {
+ kfree(new);
+ goto e_inval;
+ }
+ }
+
+ opt = rcu_dereference_protected(np->opt,
+ lockdep_sock_is_held(sk));
+ opt = ipv6_renew_options(sk, opt, optname, new);
+ kfree(new);
+ if (IS_ERR(opt)) {
+ retv = PTR_ERR(opt);
+ break;
+ }
+
+ /* routing header option needs extra check */
+ retv = -EINVAL;
+ if (optname == IPV6_RTHDR && opt && opt->srcrt) {
+ struct ipv6_rt_hdr *rthdr = opt->srcrt;
+ switch (rthdr->type) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ case IPV6_SRCRT_TYPE_2:
+ if (rthdr->hdrlen != 2 ||
+ rthdr->segments_left != 1)
+ goto sticky_done;
+
+ break;
+#endif
+ case IPV6_SRCRT_TYPE_4:
+ {
+ struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
+ opt->srcrt;
+
+ if (!seg6_validate_srh(srh, optlen))
+ goto sticky_done;
+ break;
+ }
+ default:
+ goto sticky_done;
+ }
+ }
+
+ retv = 0;
+ opt = ipv6_update_options(sk, opt);
+sticky_done:
+ if (opt) {
+ atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
+ txopt_put(opt);
+ }
+ break;
+ }
+
+ case IPV6_PKTINFO:
+ {
+ struct in6_pktinfo pkt;
+
+ if (optlen == 0)
+ goto e_inval;
+ else if (optlen < sizeof(struct in6_pktinfo) || !optval)
+ goto e_inval;
+
+ if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
+ retv = -EFAULT;
+ break;
+ }
+ if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
+ goto e_inval;
+
+ np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
+ np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
+ retv = 0;
+ break;
+ }
+
+ case IPV6_2292PKTOPTIONS:
+ {
+ struct ipv6_txoptions *opt = NULL;
+ struct msghdr msg;
+ struct flowi6 fl6;
+ struct ipcm6_cookie ipc6;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_oif = sk->sk_bound_dev_if;
+ fl6.flowi6_mark = sk->sk_mark;
+
+ if (optlen == 0)
+ goto update;
+
+ /* 1K is probably excessive
+ * 1K is surely not enough, 2K per standard header is 16K.
+ */
+ retv = -EINVAL;
+ if (optlen > 64*1024)
+ break;
+
+ opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
+ retv = -ENOBUFS;
+ if (!opt)
+ break;
+
+ memset(opt, 0, sizeof(*opt));
+ refcount_set(&opt->refcnt, 1);
+ opt->tot_len = sizeof(*opt) + optlen;
+ retv = -EFAULT;
+ if (copy_from_user(opt+1, optval, optlen))
+ goto done;
+
+ msg.msg_controllen = optlen;
+ msg.msg_control = (void *)(opt+1);
+ ipc6.opt = opt;
+
+ retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
+ if (retv)
+ goto done;
+update:
+ retv = 0;
+ opt = ipv6_update_options(sk, opt);
+done:
+ if (opt) {
+ atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
+ txopt_put(opt);
+ }
+ break;
+ }
+ case IPV6_UNICAST_HOPS:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ if (val > 255 || val < -1)
+ goto e_inval;
+ np->hop_limit = val;
+ retv = 0;
+ break;
+
+ case IPV6_MULTICAST_HOPS:
+ if (sk->sk_type == SOCK_STREAM)
+ break;
+ if (optlen < sizeof(int))
+ goto e_inval;
+ if (val > 255 || val < -1)
+ goto e_inval;
+ np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
+ retv = 0;
+ break;
+
+ case IPV6_MULTICAST_LOOP:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ if (val != valbool)
+ goto e_inval;
+ np->mc_loop = valbool;
+ retv = 0;
+ break;
+
+ case IPV6_UNICAST_IF:
+ {
+ struct net_device *dev = NULL;
+ int ifindex;
+
+ if (optlen != sizeof(int))
+ goto e_inval;
+
+ ifindex = (__force int)ntohl((__force __be32)val);
+ if (ifindex == 0) {
+ np->ucast_oif = 0;
+ retv = 0;
+ break;
+ }
+
+ dev = dev_get_by_index(net, ifindex);
+ retv = -EADDRNOTAVAIL;
+ if (!dev)
+ break;
+ dev_put(dev);
+
+ retv = -EINVAL;
+ if (sk->sk_bound_dev_if)
+ break;
+
+ np->ucast_oif = ifindex;
+ retv = 0;
+ break;
+ }
+
+ case IPV6_MULTICAST_IF:
+ if (sk->sk_type == SOCK_STREAM)
+ break;
+ if (optlen < sizeof(int))
+ goto e_inval;
+
+ if (val) {
+ struct net_device *dev;
+ int midx;
+
+ rcu_read_lock();
+
+ dev = dev_get_by_index_rcu(net, val);
+ if (!dev) {
+ rcu_read_unlock();
+ retv = -ENODEV;
+ break;
+ }
+ midx = l3mdev_master_ifindex_rcu(dev);
+
+ rcu_read_unlock();
+
+ if (sk->sk_bound_dev_if &&
+ sk->sk_bound_dev_if != val &&
+ (!midx || midx != sk->sk_bound_dev_if))
+ goto e_inval;
+ }
+ np->mcast_oif = val;
+ retv = 0;
+ break;
+ case IPV6_ADD_MEMBERSHIP:
+ case IPV6_DROP_MEMBERSHIP:
+ {
+ struct ipv6_mreq mreq;
+
+ if (optlen < sizeof(struct ipv6_mreq))
+ goto e_inval;
+
+ retv = -EPROTO;
+ if (inet_sk(sk)->is_icsk)
+ break;
+
+ retv = -EFAULT;
+ if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
+ break;
+
+ if (optname == IPV6_ADD_MEMBERSHIP)
+ retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
+ else
+ retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
+ break;
+ }
+ case IPV6_JOIN_ANYCAST:
+ case IPV6_LEAVE_ANYCAST:
+ {
+ struct ipv6_mreq mreq;
+
+ if (optlen < sizeof(struct ipv6_mreq))
+ goto e_inval;
+
+ retv = -EFAULT;
+ if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
+ break;
+
+ if (optname == IPV6_JOIN_ANYCAST)
+ retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
+ else
+ retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
+ break;
+ }
+ case MCAST_JOIN_GROUP:
+ case MCAST_LEAVE_GROUP:
+ {
+ struct group_req greq;
+ struct sockaddr_in6 *psin6;
+
+ if (optlen < sizeof(struct group_req))
+ goto e_inval;
+
+ retv = -EFAULT;
+ if (copy_from_user(&greq, optval, sizeof(struct group_req)))
+ break;
+ if (greq.gr_group.ss_family != AF_INET6) {
+ retv = -EADDRNOTAVAIL;
+ break;
+ }
+ psin6 = (struct sockaddr_in6 *)&greq.gr_group;
+ if (optname == MCAST_JOIN_GROUP)
+ retv = ipv6_sock_mc_join(sk, greq.gr_interface,
+ &psin6->sin6_addr);
+ else
+ retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
+ &psin6->sin6_addr);
+ break;
+ }
+ case MCAST_JOIN_SOURCE_GROUP:
+ case MCAST_LEAVE_SOURCE_GROUP:
+ case MCAST_BLOCK_SOURCE:
+ case MCAST_UNBLOCK_SOURCE:
+ {
+ struct group_source_req greqs;
+ int omode, add;
+
+ if (optlen < sizeof(struct group_source_req))
+ goto e_inval;
+ if (copy_from_user(&greqs, optval, sizeof(greqs))) {
+ retv = -EFAULT;
+ break;
+ }
+ if (greqs.gsr_group.ss_family != AF_INET6 ||
+ greqs.gsr_source.ss_family != AF_INET6) {
+ retv = -EADDRNOTAVAIL;
+ break;
+ }
+ if (optname == MCAST_BLOCK_SOURCE) {
+ omode = MCAST_EXCLUDE;
+ add = 1;
+ } else if (optname == MCAST_UNBLOCK_SOURCE) {
+ omode = MCAST_EXCLUDE;
+ add = 0;
+ } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
+ struct sockaddr_in6 *psin6;
+
+ psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
+ retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
+ &psin6->sin6_addr,
+ MCAST_INCLUDE);
+ /* prior join w/ different source is ok */
+ if (retv && retv != -EADDRINUSE)
+ break;
+ omode = MCAST_INCLUDE;
+ add = 1;
+ } else /* MCAST_LEAVE_SOURCE_GROUP */ {
+ omode = MCAST_INCLUDE;
+ add = 0;
+ }
+ retv = ip6_mc_source(add, omode, sk, &greqs);
+ break;
+ }
+ case MCAST_MSFILTER:
+ {
+ struct group_filter *gsf;
+
+ if (optlen < GROUP_FILTER_SIZE(0))
+ goto e_inval;
+ if (optlen > sysctl_optmem_max) {
+ retv = -ENOBUFS;
+ break;
+ }
+ gsf = memdup_user(optval, optlen);
+ if (IS_ERR(gsf)) {
+ retv = PTR_ERR(gsf);
+ break;
+ }
+ /* numsrc >= (4G-140)/128 overflow in 32 bits */
+ if (gsf->gf_numsrc >= 0x1ffffffU ||
+ gsf->gf_numsrc > sysctl_mld_max_msf) {
+ kfree(gsf);
+ retv = -ENOBUFS;
+ break;
+ }
+ if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
+ kfree(gsf);
+ retv = -EINVAL;
+ break;
+ }
+ retv = ip6_mc_msfilter(sk, gsf);
+ kfree(gsf);
+
+ break;
+ }
+ case IPV6_ROUTER_ALERT:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ retv = ip6_ra_control(sk, val);
+ break;
+ case IPV6_MTU_DISCOVER:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
+ goto e_inval;
+ np->pmtudisc = val;
+ retv = 0;
+ break;
+ case IPV6_MTU:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ if (val && val < IPV6_MIN_MTU)
+ goto e_inval;
+ np->frag_size = val;
+ retv = 0;
+ break;
+ case IPV6_RECVERR:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->recverr = valbool;
+ if (!val)
+ skb_queue_purge(&sk->sk_error_queue);
+ retv = 0;
+ break;
+ case IPV6_FLOWINFO_SEND:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->sndflow = valbool;
+ retv = 0;
+ break;
+ case IPV6_FLOWLABEL_MGR:
+ retv = ipv6_flowlabel_opt(sk, optval, optlen);
+ break;
+ case IPV6_IPSEC_POLICY:
+ case IPV6_XFRM_POLICY:
+ retv = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ break;
+ retv = xfrm_user_policy(sk, optname, optval, optlen);
+ break;
+
+ case IPV6_ADDR_PREFERENCES:
+ {
+ unsigned int pref = 0;
+ unsigned int prefmask = ~0;
+
+ if (optlen < sizeof(int))
+ goto e_inval;
+
+ retv = -EINVAL;
+
+ /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
+ switch (val & (IPV6_PREFER_SRC_PUBLIC|
+ IPV6_PREFER_SRC_TMP|
+ IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
+ case IPV6_PREFER_SRC_PUBLIC:
+ pref |= IPV6_PREFER_SRC_PUBLIC;
+ break;
+ case IPV6_PREFER_SRC_TMP:
+ pref |= IPV6_PREFER_SRC_TMP;
+ break;
+ case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
+ break;
+ case 0:
+ goto pref_skip_pubtmp;
+ default:
+ goto e_inval;
+ }
+
+ prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
+ IPV6_PREFER_SRC_TMP);
+pref_skip_pubtmp:
+
+ /* check HOME/COA conflicts */
+ switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
+ case IPV6_PREFER_SRC_HOME:
+ break;
+ case IPV6_PREFER_SRC_COA:
+ pref |= IPV6_PREFER_SRC_COA;
+ case 0:
+ goto pref_skip_coa;
+ default:
+ goto e_inval;
+ }
+
+ prefmask &= ~IPV6_PREFER_SRC_COA;
+pref_skip_coa:
+
+ /* check CGA/NONCGA conflicts */
+ switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
+ case IPV6_PREFER_SRC_CGA:
+ case IPV6_PREFER_SRC_NONCGA:
+ case 0:
+ break;
+ default:
+ goto e_inval;
+ }
+
+ np->srcprefs = (np->srcprefs & prefmask) | pref;
+ retv = 0;
+
+ break;
+ }
+ case IPV6_MINHOPCOUNT:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ if (val < 0 || val > 255)
+ goto e_inval;
+ np->min_hopcount = val;
+ retv = 0;
+ break;
+ case IPV6_DONTFRAG:
+ np->dontfrag = valbool;
+ retv = 0;
+ break;
+ case IPV6_AUTOFLOWLABEL:
+ np->autoflowlabel = valbool;
+ np->autoflowlabel_set = 1;
+ retv = 0;
+ break;
+ case IPV6_RECVFRAGSIZE:
+ np->rxopt.bits.recvfragsize = valbool;
+ retv = 0;
+ break;
+ }
+
+ release_sock(sk);
+ if (needs_rtnl)
+ rtnl_unlock();
+
+ return retv;
+
+e_inval:
+ release_sock(sk);
+ if (needs_rtnl)
+ rtnl_unlock();
+ return -EINVAL;
+}
+
+int ipv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ int err;
+
+ if (level == SOL_IP && sk->sk_type != SOCK_RAW)
+ return udp_prot.setsockopt(sk, level, optname, optval, optlen);
+
+ if (level != SOL_IPV6)
+ return -ENOPROTOOPT;
+
+ err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
+#ifdef CONFIG_NETFILTER
+ /* we need to exclude all possible ENOPROTOOPTs except default case */
+ if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
+ optname != IPV6_XFRM_POLICY)
+ err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
+#endif
+ return err;
+}
+EXPORT_SYMBOL(ipv6_setsockopt);
+
+#ifdef CONFIG_COMPAT
+int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ int err;
+
+ if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
+ if (udp_prot.compat_setsockopt != NULL)
+ return udp_prot.compat_setsockopt(sk, level, optname,
+ optval, optlen);
+ return udp_prot.setsockopt(sk, level, optname, optval, optlen);
+ }
+
+ if (level != SOL_IPV6)
+ return -ENOPROTOOPT;
+
+ if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
+ return compat_mc_setsockopt(sk, level, optname, optval, optlen,
+ ipv6_setsockopt);
+
+ err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
+#ifdef CONFIG_NETFILTER
+ /* we need to exclude all possible ENOPROTOOPTs except default case */
+ if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
+ optname != IPV6_XFRM_POLICY)
+ err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
+ optlen);
+#endif
+ return err;
+}
+EXPORT_SYMBOL(compat_ipv6_setsockopt);
+#endif
+
+static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
+ int optname, char __user *optval, int len)
+{
+ struct ipv6_opt_hdr *hdr;
+
+ if (!opt)
+ return 0;
+
+ switch (optname) {
+ case IPV6_HOPOPTS:
+ hdr = opt->hopopt;
+ break;
+ case IPV6_RTHDRDSTOPTS:
+ hdr = opt->dst0opt;
+ break;
+ case IPV6_RTHDR:
+ hdr = (struct ipv6_opt_hdr *)opt->srcrt;
+ break;
+ case IPV6_DSTOPTS:
+ hdr = opt->dst1opt;
+ break;
+ default:
+ return -EINVAL; /* should not happen */
+ }
+
+ if (!hdr)
+ return 0;
+
+ len = min_t(unsigned int, len, ipv6_optlen(hdr));
+ if (copy_to_user(optval, hdr, len))
+ return -EFAULT;
+ return len;
+}
+
+static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen, unsigned int flags)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ int len;
+ int val;
+
+ if (ip6_mroute_opt(optname))
+ return ip6_mroute_getsockopt(sk, optname, optval, optlen);
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+ switch (optname) {
+ case IPV6_ADDRFORM:
+ if (sk->sk_protocol != IPPROTO_UDP &&
+ sk->sk_protocol != IPPROTO_UDPLITE &&
+ sk->sk_protocol != IPPROTO_TCP)
+ return -ENOPROTOOPT;
+ if (sk->sk_state != TCP_ESTABLISHED)
+ return -ENOTCONN;
+ val = sk->sk_family;
+ break;
+ case MCAST_MSFILTER:
+ {
+ struct group_filter gsf;
+ int err;
+
+ if (len < GROUP_FILTER_SIZE(0))
+ return -EINVAL;
+ if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
+ return -EFAULT;
+ if (gsf.gf_group.ss_family != AF_INET6)
+ return -EADDRNOTAVAIL;
+ lock_sock(sk);
+ err = ip6_mc_msfget(sk, &gsf,
+ (struct group_filter __user *)optval, optlen);
+ release_sock(sk);
+ return err;
+ }
+
+ case IPV6_2292PKTOPTIONS:
+ {
+ struct msghdr msg;
+ struct sk_buff *skb;
+
+ if (sk->sk_type != SOCK_STREAM)
+ return -ENOPROTOOPT;
+
+ msg.msg_control = optval;
+ msg.msg_controllen = len;
+ msg.msg_flags = flags;
+
+ lock_sock(sk);
+ skb = np->pktoptions;
+ if (skb)
+ ip6_datagram_recv_ctl(sk, &msg, skb);
+ release_sock(sk);
+ if (!skb) {
+ if (np->rxopt.bits.rxinfo) {
+ struct in6_pktinfo src_info;
+ src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
+ np->sticky_pktinfo.ipi6_ifindex;
+ src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
+ put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
+ }
+ if (np->rxopt.bits.rxhlim) {
+ int hlim = np->mcast_hops;
+ put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
+ }
+ if (np->rxopt.bits.rxtclass) {
+ int tclass = (int)ip6_tclass(np->rcv_flowinfo);
+
+ put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
+ }
+ if (np->rxopt.bits.rxoinfo) {
+ struct in6_pktinfo src_info;
+ src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
+ np->sticky_pktinfo.ipi6_ifindex;
+ src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
+ np->sticky_pktinfo.ipi6_addr;
+ put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
+ }
+ if (np->rxopt.bits.rxohlim) {
+ int hlim = np->mcast_hops;
+ put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
+ }
+ if (np->rxopt.bits.rxflow) {
+ __be32 flowinfo = np->rcv_flowinfo;
+
+ put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
+ }
+ }
+ len -= msg.msg_controllen;
+ return put_user(len, optlen);
+ }
+ case IPV6_MTU:
+ {
+ struct dst_entry *dst;
+
+ val = 0;
+ rcu_read_lock();
+ dst = __sk_dst_get(sk);
+ if (dst)
+ val = dst_mtu(dst);
+ rcu_read_unlock();
+ if (!val)
+ return -ENOTCONN;
+ break;
+ }
+
+ case IPV6_V6ONLY:
+ val = sk->sk_ipv6only;
+ break;
+
+ case IPV6_RECVPKTINFO:
+ val = np->rxopt.bits.rxinfo;
+ break;
+
+ case IPV6_2292PKTINFO:
+ val = np->rxopt.bits.rxoinfo;
+ break;
+
+ case IPV6_RECVHOPLIMIT:
+ val = np->rxopt.bits.rxhlim;
+ break;
+
+ case IPV6_2292HOPLIMIT:
+ val = np->rxopt.bits.rxohlim;
+ break;
+
+ case IPV6_RECVRTHDR:
+ val = np->rxopt.bits.srcrt;
+ break;
+
+ case IPV6_2292RTHDR:
+ val = np->rxopt.bits.osrcrt;
+ break;
+
+ case IPV6_HOPOPTS:
+ case IPV6_RTHDRDSTOPTS:
+ case IPV6_RTHDR:
+ case IPV6_DSTOPTS:
+ {
+ struct ipv6_txoptions *opt;
+
+ lock_sock(sk);
+ opt = rcu_dereference_protected(np->opt,
+ lockdep_sock_is_held(sk));
+ len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
+ release_sock(sk);
+ /* check if ipv6_getsockopt_sticky() returns err code */
+ if (len < 0)
+ return len;
+ return put_user(len, optlen);
+ }
+
+ case IPV6_RECVHOPOPTS:
+ val = np->rxopt.bits.hopopts;
+ break;
+
+ case IPV6_2292HOPOPTS:
+ val = np->rxopt.bits.ohopopts;
+ break;
+
+ case IPV6_RECVDSTOPTS:
+ val = np->rxopt.bits.dstopts;
+ break;
+
+ case IPV6_2292DSTOPTS:
+ val = np->rxopt.bits.odstopts;
+ break;
+
+ case IPV6_TCLASS:
+ val = np->tclass;
+ break;
+
+ case IPV6_RECVTCLASS:
+ val = np->rxopt.bits.rxtclass;
+ break;
+
+ case IPV6_FLOWINFO:
+ val = np->rxopt.bits.rxflow;
+ break;
+
+ case IPV6_RECVPATHMTU:
+ val = np->rxopt.bits.rxpmtu;
+ break;
+
+ case IPV6_PATHMTU:
+ {
+ struct dst_entry *dst;
+ struct ip6_mtuinfo mtuinfo;
+
+ if (len < sizeof(mtuinfo))
+ return -EINVAL;
+
+ len = sizeof(mtuinfo);
+ memset(&mtuinfo, 0, sizeof(mtuinfo));
+
+ rcu_read_lock();
+ dst = __sk_dst_get(sk);
+ if (dst)
+ mtuinfo.ip6m_mtu = dst_mtu(dst);
+ rcu_read_unlock();
+ if (!mtuinfo.ip6m_mtu)
+ return -ENOTCONN;
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &mtuinfo, len))
+ return -EFAULT;
+
+ return 0;
+ }
+
+ case IPV6_TRANSPARENT:
+ val = inet_sk(sk)->transparent;
+ break;
+
+ case IPV6_FREEBIND:
+ val = inet_sk(sk)->freebind;
+ break;
+
+ case IPV6_RECVORIGDSTADDR:
+ val = np->rxopt.bits.rxorigdstaddr;
+ break;
+
+ case IPV6_UNICAST_HOPS:
+ case IPV6_MULTICAST_HOPS:
+ {
+ struct dst_entry *dst;
+
+ if (optname == IPV6_UNICAST_HOPS)
+ val = np->hop_limit;
+ else
+ val = np->mcast_hops;
+
+ if (val < 0) {
+ rcu_read_lock();
+ dst = __sk_dst_get(sk);
+ if (dst)
+ val = ip6_dst_hoplimit(dst);
+ rcu_read_unlock();
+ }
+
+ if (val < 0)
+ val = sock_net(sk)->ipv6.devconf_all->hop_limit;
+ break;
+ }
+
+ case IPV6_MULTICAST_LOOP:
+ val = np->mc_loop;
+ break;
+
+ case IPV6_MULTICAST_IF:
+ val = np->mcast_oif;
+ break;
+
+ case IPV6_UNICAST_IF:
+ val = (__force int)htonl((__u32) np->ucast_oif);
+ break;
+
+ case IPV6_MTU_DISCOVER:
+ val = np->pmtudisc;
+ break;
+
+ case IPV6_RECVERR:
+ val = np->recverr;
+ break;
+
+ case IPV6_FLOWINFO_SEND:
+ val = np->sndflow;
+ break;
+
+ case IPV6_FLOWLABEL_MGR:
+ {
+ struct in6_flowlabel_req freq;
+ int flags;
+
+ if (len < sizeof(freq))
+ return -EINVAL;
+
+ if (copy_from_user(&freq, optval, sizeof(freq)))
+ return -EFAULT;
+
+ if (freq.flr_action != IPV6_FL_A_GET)
+ return -EINVAL;
+
+ len = sizeof(freq);
+ flags = freq.flr_flags;
+
+ memset(&freq, 0, sizeof(freq));
+
+ val = ipv6_flowlabel_opt_get(sk, &freq, flags);
+ if (val < 0)
+ return val;
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &freq, len))
+ return -EFAULT;
+
+ return 0;
+ }
+
+ case IPV6_ADDR_PREFERENCES:
+ val = 0;
+
+ if (np->srcprefs & IPV6_PREFER_SRC_TMP)
+ val |= IPV6_PREFER_SRC_TMP;
+ else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
+ val |= IPV6_PREFER_SRC_PUBLIC;
+ else {
+ /* XXX: should we return system default? */
+ val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
+ }
+
+ if (np->srcprefs & IPV6_PREFER_SRC_COA)
+ val |= IPV6_PREFER_SRC_COA;
+ else
+ val |= IPV6_PREFER_SRC_HOME;
+ break;
+
+ case IPV6_MINHOPCOUNT:
+ val = np->min_hopcount;
+ break;
+
+ case IPV6_DONTFRAG:
+ val = np->dontfrag;
+ break;
+
+ case IPV6_AUTOFLOWLABEL:
+ val = ip6_autoflowlabel(sock_net(sk), np);
+ break;
+
+ case IPV6_RECVFRAGSIZE:
+ val = np->rxopt.bits.recvfragsize;
+ break;
+
+ default:
+ return -ENOPROTOOPT;
+ }
+ len = min_t(unsigned int, sizeof(int), len);
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &val, len))
+ return -EFAULT;
+ return 0;
+}
+
+int ipv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ int err;
+
+ if (level == SOL_IP && sk->sk_type != SOCK_RAW)
+ return udp_prot.getsockopt(sk, level, optname, optval, optlen);
+
+ if (level != SOL_IPV6)
+ return -ENOPROTOOPT;
+
+ err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
+#ifdef CONFIG_NETFILTER
+ /* we need to exclude all possible ENOPROTOOPTs except default case */
+ if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
+ int len;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+
+ err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
+ if (err >= 0)
+ err = put_user(len, optlen);
+ }
+#endif
+ return err;
+}
+EXPORT_SYMBOL(ipv6_getsockopt);
+
+#ifdef CONFIG_COMPAT
+int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ int err;
+
+ if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
+ if (udp_prot.compat_getsockopt != NULL)
+ return udp_prot.compat_getsockopt(sk, level, optname,
+ optval, optlen);
+ return udp_prot.getsockopt(sk, level, optname, optval, optlen);
+ }
+
+ if (level != SOL_IPV6)
+ return -ENOPROTOOPT;
+
+ if (optname == MCAST_MSFILTER)
+ return compat_mc_getsockopt(sk, level, optname, optval, optlen,
+ ipv6_getsockopt);
+
+ err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
+ MSG_CMSG_COMPAT);
+#ifdef CONFIG_NETFILTER
+ /* we need to exclude all possible ENOPROTOOPTs except default case */
+ if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
+ int len;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+
+ err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
+ if (err >= 0)
+ err = put_user(len, optlen);
+ }
+#endif
+ return err;
+}
+EXPORT_SYMBOL(compat_ipv6_getsockopt);
+#endif
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
new file mode 100644
index 0000000..dbab62e
--- /dev/null
+++ b/net/ipv6/mcast.c
@@ -0,0 +1,3024 @@
+/*
+ * Multicast support for IPv6
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/* Changes:
+ *
+ * yoshfuji : fix format of router-alert option
+ * YOSHIFUJI Hideaki @USAGI:
+ * Fixed source address for MLD message based on
+ * <draft-ietf-magma-mld-source-05.txt>.
+ * YOSHIFUJI Hideaki @USAGI:
+ * - Ignore Queries for invalid addresses.
+ * - MLD for link-local addresses.
+ * David L Stevens <dlstevens@us.ibm.com>:
+ * - MLDv2 support
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/jiffies.h>
+#include <linux/times.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/route.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/pkt_sched.h>
+#include <net/mld.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/if_inet6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+#include <net/inet_common.h>
+
+#include <net/ip6_checksum.h>
+
+/* Ensure that we have struct in6_addr aligned on 32bit word. */
+static int __mld2_query_bugs[] __attribute__((__unused__)) = {
+ BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
+ BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
+ BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
+};
+
+static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
+
+static void igmp6_join_group(struct ifmcaddr6 *ma);
+static void igmp6_leave_group(struct ifmcaddr6 *ma);
+static void igmp6_timer_handler(struct timer_list *t);
+
+static void mld_gq_timer_expire(struct timer_list *t);
+static void mld_ifc_timer_expire(struct timer_list *t);
+static void mld_ifc_event(struct inet6_dev *idev);
+static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
+static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
+static void mld_clear_delrec(struct inet6_dev *idev);
+static bool mld_in_v1_mode(const struct inet6_dev *idev);
+static int sf_setstate(struct ifmcaddr6 *pmc);
+static void sf_markstate(struct ifmcaddr6 *pmc);
+static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
+static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
+ int sfmode, int sfcount, const struct in6_addr *psfsrc,
+ int delta);
+static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
+ int sfmode, int sfcount, const struct in6_addr *psfsrc,
+ int delta);
+static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
+ struct inet6_dev *idev);
+static int __ipv6_dev_mc_inc(struct net_device *dev,
+ const struct in6_addr *addr, unsigned int mode);
+
+#define MLD_QRV_DEFAULT 2
+/* RFC3810, 9.2. Query Interval */
+#define MLD_QI_DEFAULT (125 * HZ)
+/* RFC3810, 9.3. Query Response Interval */
+#define MLD_QRI_DEFAULT (10 * HZ)
+
+/* RFC3810, 8.1 Query Version Distinctions */
+#define MLD_V1_QUERY_LEN 24
+#define MLD_V2_QUERY_LEN_MIN 28
+
+#define IPV6_MLD_MAX_MSF 64
+
+int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
+int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
+
+/*
+ * socket join on multicast group
+ */
+
+#define for_each_pmc_rcu(np, pmc) \
+ for (pmc = rcu_dereference(np->ipv6_mc_list); \
+ pmc != NULL; \
+ pmc = rcu_dereference(pmc->next))
+
+static int unsolicited_report_interval(struct inet6_dev *idev)
+{
+ int iv;
+
+ if (mld_in_v1_mode(idev))
+ iv = idev->cnf.mldv1_unsolicited_report_interval;
+ else
+ iv = idev->cnf.mldv2_unsolicited_report_interval;
+
+ return iv > 0 ? iv : 1;
+}
+
+static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
+ const struct in6_addr *addr, unsigned int mode)
+{
+ struct net_device *dev = NULL;
+ struct ipv6_mc_socklist *mc_lst;
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct net *net = sock_net(sk);
+ int err;
+
+ ASSERT_RTNL();
+
+ if (!ipv6_addr_is_multicast(addr))
+ return -EINVAL;
+
+ rcu_read_lock();
+ for_each_pmc_rcu(np, mc_lst) {
+ if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
+ ipv6_addr_equal(&mc_lst->addr, addr)) {
+ rcu_read_unlock();
+ return -EADDRINUSE;
+ }
+ }
+ rcu_read_unlock();
+
+ mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
+
+ if (!mc_lst)
+ return -ENOMEM;
+
+ mc_lst->next = NULL;
+ mc_lst->addr = *addr;
+
+ if (ifindex == 0) {
+ struct rt6_info *rt;
+ rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
+ if (rt) {
+ dev = rt->dst.dev;
+ ip6_rt_put(rt);
+ }
+ } else
+ dev = __dev_get_by_index(net, ifindex);
+
+ if (!dev) {
+ sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
+ return -ENODEV;
+ }
+
+ mc_lst->ifindex = dev->ifindex;
+ mc_lst->sfmode = mode;
+ rwlock_init(&mc_lst->sflock);
+ mc_lst->sflist = NULL;
+
+ /*
+ * now add/increase the group membership on the device
+ */
+
+ err = __ipv6_dev_mc_inc(dev, addr, mode);
+
+ if (err) {
+ sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
+ return err;
+ }
+
+ mc_lst->next = np->ipv6_mc_list;
+ rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
+
+ return 0;
+}
+
+int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
+{
+ return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
+}
+EXPORT_SYMBOL(ipv6_sock_mc_join);
+
+int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
+ const struct in6_addr *addr, unsigned int mode)
+{
+ return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
+}
+
+/*
+ * socket leave on multicast group
+ */
+int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_mc_socklist *mc_lst;
+ struct ipv6_mc_socklist __rcu **lnk;
+ struct net *net = sock_net(sk);
+
+ ASSERT_RTNL();
+
+ if (!ipv6_addr_is_multicast(addr))
+ return -EINVAL;
+
+ for (lnk = &np->ipv6_mc_list;
+ (mc_lst = rtnl_dereference(*lnk)) != NULL;
+ lnk = &mc_lst->next) {
+ if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
+ ipv6_addr_equal(&mc_lst->addr, addr)) {
+ struct net_device *dev;
+
+ *lnk = mc_lst->next;
+
+ dev = __dev_get_by_index(net, mc_lst->ifindex);
+ if (dev) {
+ struct inet6_dev *idev = __in6_dev_get(dev);
+
+ (void) ip6_mc_leave_src(sk, mc_lst, idev);
+ if (idev)
+ __ipv6_dev_mc_dec(idev, &mc_lst->addr);
+ } else
+ (void) ip6_mc_leave_src(sk, mc_lst, NULL);
+
+ atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
+ kfree_rcu(mc_lst, rcu);
+ return 0;
+ }
+ }
+
+ return -EADDRNOTAVAIL;
+}
+EXPORT_SYMBOL(ipv6_sock_mc_drop);
+
+/* called with rcu_read_lock() */
+static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
+ const struct in6_addr *group,
+ int ifindex)
+{
+ struct net_device *dev = NULL;
+ struct inet6_dev *idev = NULL;
+
+ if (ifindex == 0) {
+ struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
+
+ if (rt) {
+ dev = rt->dst.dev;
+ ip6_rt_put(rt);
+ }
+ } else
+ dev = dev_get_by_index_rcu(net, ifindex);
+
+ if (!dev)
+ return NULL;
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ return NULL;
+ read_lock_bh(&idev->lock);
+ if (idev->dead) {
+ read_unlock_bh(&idev->lock);
+ return NULL;
+ }
+ return idev;
+}
+
+void __ipv6_sock_mc_close(struct sock *sk)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_mc_socklist *mc_lst;
+ struct net *net = sock_net(sk);
+
+ ASSERT_RTNL();
+
+ while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
+ struct net_device *dev;
+
+ np->ipv6_mc_list = mc_lst->next;
+
+ dev = __dev_get_by_index(net, mc_lst->ifindex);
+ if (dev) {
+ struct inet6_dev *idev = __in6_dev_get(dev);
+
+ (void) ip6_mc_leave_src(sk, mc_lst, idev);
+ if (idev)
+ __ipv6_dev_mc_dec(idev, &mc_lst->addr);
+ } else
+ (void) ip6_mc_leave_src(sk, mc_lst, NULL);
+
+ atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
+ kfree_rcu(mc_lst, rcu);
+ }
+}
+
+void ipv6_sock_mc_close(struct sock *sk)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ if (!rcu_access_pointer(np->ipv6_mc_list))
+ return;
+ rtnl_lock();
+ __ipv6_sock_mc_close(sk);
+ rtnl_unlock();
+}
+
+int ip6_mc_source(int add, int omode, struct sock *sk,
+ struct group_source_req *pgsr)
+{
+ struct in6_addr *source, *group;
+ struct ipv6_mc_socklist *pmc;
+ struct inet6_dev *idev;
+ struct ipv6_pinfo *inet6 = inet6_sk(sk);
+ struct ip6_sf_socklist *psl;
+ struct net *net = sock_net(sk);
+ int i, j, rv;
+ int leavegroup = 0;
+ int pmclocked = 0;
+ int err;
+
+ source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
+ group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
+
+ if (!ipv6_addr_is_multicast(group))
+ return -EINVAL;
+
+ rcu_read_lock();
+ idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
+ if (!idev) {
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+
+ err = -EADDRNOTAVAIL;
+
+ for_each_pmc_rcu(inet6, pmc) {
+ if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
+ continue;
+ if (ipv6_addr_equal(&pmc->addr, group))
+ break;
+ }
+ if (!pmc) { /* must have a prior join */
+ err = -EINVAL;
+ goto done;
+ }
+ /* if a source filter was set, must be the same mode as before */
+ if (pmc->sflist) {
+ if (pmc->sfmode != omode) {
+ err = -EINVAL;
+ goto done;
+ }
+ } else if (pmc->sfmode != omode) {
+ /* allow mode switches for empty-set filters */
+ ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
+ ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
+ pmc->sfmode = omode;
+ }
+
+ write_lock(&pmc->sflock);
+ pmclocked = 1;
+
+ psl = pmc->sflist;
+ if (!add) {
+ if (!psl)
+ goto done; /* err = -EADDRNOTAVAIL */
+ rv = !0;
+ for (i = 0; i < psl->sl_count; i++) {
+ rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
+ if (rv == 0)
+ break;
+ }
+ if (rv) /* source not found */
+ goto done; /* err = -EADDRNOTAVAIL */
+
+ /* special case - (INCLUDE, empty) == LEAVE_GROUP */
+ if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
+ leavegroup = 1;
+ goto done;
+ }
+
+ /* update the interface filter */
+ ip6_mc_del_src(idev, group, omode, 1, source, 1);
+
+ for (j = i+1; j < psl->sl_count; j++)
+ psl->sl_addr[j-1] = psl->sl_addr[j];
+ psl->sl_count--;
+ err = 0;
+ goto done;
+ }
+ /* else, add a new source to the filter */
+
+ if (psl && psl->sl_count >= sysctl_mld_max_msf) {
+ err = -ENOBUFS;
+ goto done;
+ }
+ if (!psl || psl->sl_count == psl->sl_max) {
+ struct ip6_sf_socklist *newpsl;
+ int count = IP6_SFBLOCK;
+
+ if (psl)
+ count += psl->sl_max;
+ newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
+ if (!newpsl) {
+ err = -ENOBUFS;
+ goto done;
+ }
+ newpsl->sl_max = count;
+ newpsl->sl_count = count - IP6_SFBLOCK;
+ if (psl) {
+ for (i = 0; i < psl->sl_count; i++)
+ newpsl->sl_addr[i] = psl->sl_addr[i];
+ sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
+ }
+ pmc->sflist = psl = newpsl;
+ }
+ rv = 1; /* > 0 for insert logic below if sl_count is 0 */
+ for (i = 0; i < psl->sl_count; i++) {
+ rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
+ if (rv == 0) /* There is an error in the address. */
+ goto done;
+ }
+ for (j = psl->sl_count-1; j >= i; j--)
+ psl->sl_addr[j+1] = psl->sl_addr[j];
+ psl->sl_addr[i] = *source;
+ psl->sl_count++;
+ err = 0;
+ /* update the interface list */
+ ip6_mc_add_src(idev, group, omode, 1, source, 1);
+done:
+ if (pmclocked)
+ write_unlock(&pmc->sflock);
+ read_unlock_bh(&idev->lock);
+ rcu_read_unlock();
+ if (leavegroup)
+ err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
+ return err;
+}
+
+int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
+{
+ const struct in6_addr *group;
+ struct ipv6_mc_socklist *pmc;
+ struct inet6_dev *idev;
+ struct ipv6_pinfo *inet6 = inet6_sk(sk);
+ struct ip6_sf_socklist *newpsl, *psl;
+ struct net *net = sock_net(sk);
+ int leavegroup = 0;
+ int i, err;
+
+ group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
+
+ if (!ipv6_addr_is_multicast(group))
+ return -EINVAL;
+ if (gsf->gf_fmode != MCAST_INCLUDE &&
+ gsf->gf_fmode != MCAST_EXCLUDE)
+ return -EINVAL;
+
+ rcu_read_lock();
+ idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
+
+ if (!idev) {
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+
+ err = 0;
+
+ if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
+ leavegroup = 1;
+ goto done;
+ }
+
+ for_each_pmc_rcu(inet6, pmc) {
+ if (pmc->ifindex != gsf->gf_interface)
+ continue;
+ if (ipv6_addr_equal(&pmc->addr, group))
+ break;
+ }
+ if (!pmc) { /* must have a prior join */
+ err = -EINVAL;
+ goto done;
+ }
+ if (gsf->gf_numsrc) {
+ newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
+ GFP_ATOMIC);
+ if (!newpsl) {
+ err = -ENOBUFS;
+ goto done;
+ }
+ newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
+ for (i = 0; i < newpsl->sl_count; ++i) {
+ struct sockaddr_in6 *psin6;
+
+ psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
+ newpsl->sl_addr[i] = psin6->sin6_addr;
+ }
+ err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
+ newpsl->sl_count, newpsl->sl_addr, 0);
+ if (err) {
+ sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
+ goto done;
+ }
+ } else {
+ newpsl = NULL;
+ (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
+ }
+
+ write_lock(&pmc->sflock);
+ psl = pmc->sflist;
+ if (psl) {
+ (void) ip6_mc_del_src(idev, group, pmc->sfmode,
+ psl->sl_count, psl->sl_addr, 0);
+ sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
+ } else
+ (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
+ pmc->sflist = newpsl;
+ pmc->sfmode = gsf->gf_fmode;
+ write_unlock(&pmc->sflock);
+ err = 0;
+done:
+ read_unlock_bh(&idev->lock);
+ rcu_read_unlock();
+ if (leavegroup)
+ err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
+ return err;
+}
+
+int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
+ struct group_filter __user *optval, int __user *optlen)
+{
+ int err, i, count, copycount;
+ const struct in6_addr *group;
+ struct ipv6_mc_socklist *pmc;
+ struct inet6_dev *idev;
+ struct ipv6_pinfo *inet6 = inet6_sk(sk);
+ struct ip6_sf_socklist *psl;
+ struct net *net = sock_net(sk);
+
+ group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
+
+ if (!ipv6_addr_is_multicast(group))
+ return -EINVAL;
+
+ rcu_read_lock();
+ idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
+
+ if (!idev) {
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+
+ err = -EADDRNOTAVAIL;
+ /* changes to the ipv6_mc_list require the socket lock and
+ * rtnl lock. We have the socket lock and rcu read lock,
+ * so reading the list is safe.
+ */
+
+ for_each_pmc_rcu(inet6, pmc) {
+ if (pmc->ifindex != gsf->gf_interface)
+ continue;
+ if (ipv6_addr_equal(group, &pmc->addr))
+ break;
+ }
+ if (!pmc) /* must have a prior join */
+ goto done;
+ gsf->gf_fmode = pmc->sfmode;
+ psl = pmc->sflist;
+ count = psl ? psl->sl_count : 0;
+ read_unlock_bh(&idev->lock);
+ rcu_read_unlock();
+
+ copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
+ gsf->gf_numsrc = count;
+ if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
+ copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
+ return -EFAULT;
+ }
+ /* changes to psl require the socket lock, and a write lock
+ * on pmc->sflock. We have the socket lock so reading here is safe.
+ */
+ for (i = 0; i < copycount; i++) {
+ struct sockaddr_in6 *psin6;
+ struct sockaddr_storage ss;
+
+ psin6 = (struct sockaddr_in6 *)&ss;
+ memset(&ss, 0, sizeof(ss));
+ psin6->sin6_family = AF_INET6;
+ psin6->sin6_addr = psl->sl_addr[i];
+ if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
+ return -EFAULT;
+ }
+ return 0;
+done:
+ read_unlock_bh(&idev->lock);
+ rcu_read_unlock();
+ return err;
+}
+
+bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
+ const struct in6_addr *src_addr)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_mc_socklist *mc;
+ struct ip6_sf_socklist *psl;
+ bool rv = true;
+
+ rcu_read_lock();
+ for_each_pmc_rcu(np, mc) {
+ if (ipv6_addr_equal(&mc->addr, mc_addr))
+ break;
+ }
+ if (!mc) {
+ rcu_read_unlock();
+ return true;
+ }
+ read_lock(&mc->sflock);
+ psl = mc->sflist;
+ if (!psl) {
+ rv = mc->sfmode == MCAST_EXCLUDE;
+ } else {
+ int i;
+
+ for (i = 0; i < psl->sl_count; i++) {
+ if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
+ break;
+ }
+ if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
+ rv = false;
+ if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
+ rv = false;
+ }
+ read_unlock(&mc->sflock);
+ rcu_read_unlock();
+
+ return rv;
+}
+
+static void igmp6_group_added(struct ifmcaddr6 *mc)
+{
+ struct net_device *dev = mc->idev->dev;
+ char buf[MAX_ADDR_LEN];
+
+ if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
+ IPV6_ADDR_SCOPE_LINKLOCAL)
+ return;
+
+ spin_lock_bh(&mc->mca_lock);
+ if (!(mc->mca_flags&MAF_LOADED)) {
+ mc->mca_flags |= MAF_LOADED;
+ if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
+ dev_mc_add(dev, buf);
+ }
+ spin_unlock_bh(&mc->mca_lock);
+
+ if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
+ return;
+
+ if (mld_in_v1_mode(mc->idev)) {
+ igmp6_join_group(mc);
+ return;
+ }
+ /* else v2 */
+
+ /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
+ * should not send filter-mode change record as the mode
+ * should be from IN() to IN(A).
+ */
+ if (mc->mca_sfmode == MCAST_EXCLUDE)
+ mc->mca_crcount = mc->idev->mc_qrv;
+
+ mld_ifc_event(mc->idev);
+}
+
+static void igmp6_group_dropped(struct ifmcaddr6 *mc)
+{
+ struct net_device *dev = mc->idev->dev;
+ char buf[MAX_ADDR_LEN];
+
+ if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
+ IPV6_ADDR_SCOPE_LINKLOCAL)
+ return;
+
+ spin_lock_bh(&mc->mca_lock);
+ if (mc->mca_flags&MAF_LOADED) {
+ mc->mca_flags &= ~MAF_LOADED;
+ if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
+ dev_mc_del(dev, buf);
+ }
+
+ spin_unlock_bh(&mc->mca_lock);
+ if (mc->mca_flags & MAF_NOREPORT)
+ return;
+
+ if (!mc->idev->dead)
+ igmp6_leave_group(mc);
+
+ spin_lock_bh(&mc->mca_lock);
+ if (del_timer(&mc->mca_timer))
+ refcount_dec(&mc->mca_refcnt);
+ spin_unlock_bh(&mc->mca_lock);
+}
+
+/*
+ * deleted ifmcaddr6 manipulation
+ */
+static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
+{
+ struct ifmcaddr6 *pmc;
+
+ /* this is an "ifmcaddr6" for convenience; only the fields below
+ * are actually used. In particular, the refcnt and users are not
+ * used for management of the delete list. Using the same structure
+ * for deleted items allows change reports to use common code with
+ * non-deleted or query-response MCA's.
+ */
+ pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
+ if (!pmc)
+ return;
+
+ spin_lock_bh(&im->mca_lock);
+ spin_lock_init(&pmc->mca_lock);
+ pmc->idev = im->idev;
+ in6_dev_hold(idev);
+ pmc->mca_addr = im->mca_addr;
+ pmc->mca_crcount = idev->mc_qrv;
+ pmc->mca_sfmode = im->mca_sfmode;
+ if (pmc->mca_sfmode == MCAST_INCLUDE) {
+ struct ip6_sf_list *psf;
+
+ pmc->mca_tomb = im->mca_tomb;
+ pmc->mca_sources = im->mca_sources;
+ im->mca_tomb = im->mca_sources = NULL;
+ for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
+ psf->sf_crcount = pmc->mca_crcount;
+ }
+ spin_unlock_bh(&im->mca_lock);
+
+ spin_lock_bh(&idev->mc_lock);
+ pmc->next = idev->mc_tomb;
+ idev->mc_tomb = pmc;
+ spin_unlock_bh(&idev->mc_lock);
+}
+
+static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
+{
+ struct ifmcaddr6 *pmc, *pmc_prev;
+ struct ip6_sf_list *psf;
+ struct in6_addr *pmca = &im->mca_addr;
+
+ spin_lock_bh(&idev->mc_lock);
+ pmc_prev = NULL;
+ for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
+ if (ipv6_addr_equal(&pmc->mca_addr, pmca))
+ break;
+ pmc_prev = pmc;
+ }
+ if (pmc) {
+ if (pmc_prev)
+ pmc_prev->next = pmc->next;
+ else
+ idev->mc_tomb = pmc->next;
+ }
+ spin_unlock_bh(&idev->mc_lock);
+
+ spin_lock_bh(&im->mca_lock);
+ if (pmc) {
+ im->idev = pmc->idev;
+ if (im->mca_sfmode == MCAST_INCLUDE) {
+ im->mca_tomb = pmc->mca_tomb;
+ im->mca_sources = pmc->mca_sources;
+ for (psf = im->mca_sources; psf; psf = psf->sf_next)
+ psf->sf_crcount = idev->mc_qrv;
+ } else {
+ im->mca_crcount = idev->mc_qrv;
+ }
+ in6_dev_put(pmc->idev);
+ kfree(pmc);
+ }
+ spin_unlock_bh(&im->mca_lock);
+}
+
+static void mld_clear_delrec(struct inet6_dev *idev)
+{
+ struct ifmcaddr6 *pmc, *nextpmc;
+
+ spin_lock_bh(&idev->mc_lock);
+ pmc = idev->mc_tomb;
+ idev->mc_tomb = NULL;
+ spin_unlock_bh(&idev->mc_lock);
+
+ for (; pmc; pmc = nextpmc) {
+ nextpmc = pmc->next;
+ ip6_mc_clear_src(pmc);
+ in6_dev_put(pmc->idev);
+ kfree(pmc);
+ }
+
+ /* clear dead sources, too */
+ read_lock_bh(&idev->lock);
+ for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
+ struct ip6_sf_list *psf, *psf_next;
+
+ spin_lock_bh(&pmc->mca_lock);
+ psf = pmc->mca_tomb;
+ pmc->mca_tomb = NULL;
+ spin_unlock_bh(&pmc->mca_lock);
+ for (; psf; psf = psf_next) {
+ psf_next = psf->sf_next;
+ kfree(psf);
+ }
+ }
+ read_unlock_bh(&idev->lock);
+}
+
+static void mca_get(struct ifmcaddr6 *mc)
+{
+ refcount_inc(&mc->mca_refcnt);
+}
+
+static void ma_put(struct ifmcaddr6 *mc)
+{
+ if (refcount_dec_and_test(&mc->mca_refcnt)) {
+ in6_dev_put(mc->idev);
+ kfree(mc);
+ }
+}
+
+static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
+ const struct in6_addr *addr,
+ unsigned int mode)
+{
+ struct ifmcaddr6 *mc;
+
+ mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
+ if (!mc)
+ return NULL;
+
+ timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
+
+ mc->mca_addr = *addr;
+ mc->idev = idev; /* reference taken by caller */
+ mc->mca_users = 1;
+ /* mca_stamp should be updated upon changes */
+ mc->mca_cstamp = mc->mca_tstamp = jiffies;
+ refcount_set(&mc->mca_refcnt, 1);
+ spin_lock_init(&mc->mca_lock);
+
+ mc->mca_sfmode = mode;
+ mc->mca_sfcount[mode] = 1;
+
+ if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
+ IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
+ mc->mca_flags |= MAF_NOREPORT;
+
+ return mc;
+}
+
+/*
+ * device multicast group inc (add if not found)
+ */
+static int __ipv6_dev_mc_inc(struct net_device *dev,
+ const struct in6_addr *addr, unsigned int mode)
+{
+ struct ifmcaddr6 *mc;
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ /* we need to take a reference on idev */
+ idev = in6_dev_get(dev);
+
+ if (!idev)
+ return -EINVAL;
+
+ write_lock_bh(&idev->lock);
+ if (idev->dead) {
+ write_unlock_bh(&idev->lock);
+ in6_dev_put(idev);
+ return -ENODEV;
+ }
+
+ for (mc = idev->mc_list; mc; mc = mc->next) {
+ if (ipv6_addr_equal(&mc->mca_addr, addr)) {
+ mc->mca_users++;
+ write_unlock_bh(&idev->lock);
+ ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
+ in6_dev_put(idev);
+ return 0;
+ }
+ }
+
+ mc = mca_alloc(idev, addr, mode);
+ if (!mc) {
+ write_unlock_bh(&idev->lock);
+ in6_dev_put(idev);
+ return -ENOMEM;
+ }
+
+ mc->next = idev->mc_list;
+ idev->mc_list = mc;
+
+ /* Hold this for the code below before we unlock,
+ * it is already exposed via idev->mc_list.
+ */
+ mca_get(mc);
+ write_unlock_bh(&idev->lock);
+
+ mld_del_delrec(idev, mc);
+ igmp6_group_added(mc);
+ ma_put(mc);
+ return 0;
+}
+
+int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
+{
+ return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
+}
+
+/*
+ * device multicast group del
+ */
+int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
+{
+ struct ifmcaddr6 *ma, **map;
+
+ ASSERT_RTNL();
+
+ write_lock_bh(&idev->lock);
+ for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
+ if (ipv6_addr_equal(&ma->mca_addr, addr)) {
+ if (--ma->mca_users == 0) {
+ *map = ma->next;
+ write_unlock_bh(&idev->lock);
+
+ igmp6_group_dropped(ma);
+ ip6_mc_clear_src(ma);
+
+ ma_put(ma);
+ return 0;
+ }
+ write_unlock_bh(&idev->lock);
+ return 0;
+ }
+ }
+ write_unlock_bh(&idev->lock);
+
+ return -ENOENT;
+}
+
+int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
+{
+ struct inet6_dev *idev;
+ int err;
+
+ ASSERT_RTNL();
+
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ err = -ENODEV;
+ else
+ err = __ipv6_dev_mc_dec(idev, addr);
+
+ return err;
+}
+
+/*
+ * check if the interface/address pair is valid
+ */
+bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
+ const struct in6_addr *src_addr)
+{
+ struct inet6_dev *idev;
+ struct ifmcaddr6 *mc;
+ bool rv = false;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ read_lock_bh(&idev->lock);
+ for (mc = idev->mc_list; mc; mc = mc->next) {
+ if (ipv6_addr_equal(&mc->mca_addr, group))
+ break;
+ }
+ if (mc) {
+ if (src_addr && !ipv6_addr_any(src_addr)) {
+ struct ip6_sf_list *psf;
+
+ spin_lock_bh(&mc->mca_lock);
+ for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
+ if (ipv6_addr_equal(&psf->sf_addr, src_addr))
+ break;
+ }
+ if (psf)
+ rv = psf->sf_count[MCAST_INCLUDE] ||
+ psf->sf_count[MCAST_EXCLUDE] !=
+ mc->mca_sfcount[MCAST_EXCLUDE];
+ else
+ rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
+ spin_unlock_bh(&mc->mca_lock);
+ } else
+ rv = true; /* don't filter unspecified source */
+ }
+ read_unlock_bh(&idev->lock);
+ }
+ rcu_read_unlock();
+ return rv;
+}
+
+static void mld_gq_start_timer(struct inet6_dev *idev)
+{
+ unsigned long tv = prandom_u32() % idev->mc_maxdelay;
+
+ idev->mc_gq_running = 1;
+ if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
+ in6_dev_hold(idev);
+}
+
+static void mld_gq_stop_timer(struct inet6_dev *idev)
+{
+ idev->mc_gq_running = 0;
+ if (del_timer(&idev->mc_gq_timer))
+ __in6_dev_put(idev);
+}
+
+static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
+{
+ unsigned long tv = prandom_u32() % delay;
+
+ if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
+ in6_dev_hold(idev);
+}
+
+static void mld_ifc_stop_timer(struct inet6_dev *idev)
+{
+ idev->mc_ifc_count = 0;
+ if (del_timer(&idev->mc_ifc_timer))
+ __in6_dev_put(idev);
+}
+
+static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
+{
+ unsigned long tv = prandom_u32() % delay;
+
+ if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
+ in6_dev_hold(idev);
+}
+
+static void mld_dad_stop_timer(struct inet6_dev *idev)
+{
+ if (del_timer(&idev->mc_dad_timer))
+ __in6_dev_put(idev);
+}
+
+/*
+ * IGMP handling (alias multicast ICMPv6 messages)
+ */
+
+static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
+{
+ unsigned long delay = resptime;
+
+ /* Do not start timer for these addresses */
+ if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
+ IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
+ return;
+
+ if (del_timer(&ma->mca_timer)) {
+ refcount_dec(&ma->mca_refcnt);
+ delay = ma->mca_timer.expires - jiffies;
+ }
+
+ if (delay >= resptime)
+ delay = prandom_u32() % resptime;
+
+ ma->mca_timer.expires = jiffies + delay;
+ if (!mod_timer(&ma->mca_timer, jiffies + delay))
+ refcount_inc(&ma->mca_refcnt);
+ ma->mca_flags |= MAF_TIMER_RUNNING;
+}
+
+/* mark EXCLUDE-mode sources */
+static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
+ const struct in6_addr *srcs)
+{
+ struct ip6_sf_list *psf;
+ int i, scount;
+
+ scount = 0;
+ for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
+ if (scount == nsrcs)
+ break;
+ for (i = 0; i < nsrcs; i++) {
+ /* skip inactive filters */
+ if (psf->sf_count[MCAST_INCLUDE] ||
+ pmc->mca_sfcount[MCAST_EXCLUDE] !=
+ psf->sf_count[MCAST_EXCLUDE])
+ break;
+ if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
+ scount++;
+ break;
+ }
+ }
+ }
+ pmc->mca_flags &= ~MAF_GSQUERY;
+ if (scount == nsrcs) /* all sources excluded */
+ return false;
+ return true;
+}
+
+static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
+ const struct in6_addr *srcs)
+{
+ struct ip6_sf_list *psf;
+ int i, scount;
+
+ if (pmc->mca_sfmode == MCAST_EXCLUDE)
+ return mld_xmarksources(pmc, nsrcs, srcs);
+
+ /* mark INCLUDE-mode sources */
+
+ scount = 0;
+ for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
+ if (scount == nsrcs)
+ break;
+ for (i = 0; i < nsrcs; i++) {
+ if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
+ psf->sf_gsresp = 1;
+ scount++;
+ break;
+ }
+ }
+ }
+ if (!scount) {
+ pmc->mca_flags &= ~MAF_GSQUERY;
+ return false;
+ }
+ pmc->mca_flags |= MAF_GSQUERY;
+ return true;
+}
+
+static int mld_force_mld_version(const struct inet6_dev *idev)
+{
+ /* Normally, both are 0 here. If enforcement to a particular is
+ * being used, individual device enforcement will have a lower
+ * precedence over 'all' device (.../conf/all/force_mld_version).
+ */
+
+ if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
+ return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
+ else
+ return idev->cnf.force_mld_version;
+}
+
+static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
+{
+ return mld_force_mld_version(idev) == 2;
+}
+
+static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
+{
+ return mld_force_mld_version(idev) == 1;
+}
+
+static bool mld_in_v1_mode(const struct inet6_dev *idev)
+{
+ if (mld_in_v2_mode_only(idev))
+ return false;
+ if (mld_in_v1_mode_only(idev))
+ return true;
+ if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
+ return true;
+
+ return false;
+}
+
+static void mld_set_v1_mode(struct inet6_dev *idev)
+{
+ /* RFC3810, relevant sections:
+ * - 9.1. Robustness Variable
+ * - 9.2. Query Interval
+ * - 9.3. Query Response Interval
+ * - 9.12. Older Version Querier Present Timeout
+ */
+ unsigned long switchback;
+
+ switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
+
+ idev->mc_v1_seen = jiffies + switchback;
+}
+
+static void mld_update_qrv(struct inet6_dev *idev,
+ const struct mld2_query *mlh2)
+{
+ /* RFC3810, relevant sections:
+ * - 5.1.8. QRV (Querier's Robustness Variable)
+ * - 9.1. Robustness Variable
+ */
+
+ /* The value of the Robustness Variable MUST NOT be zero,
+ * and SHOULD NOT be one. Catch this here if we ever run
+ * into such a case in future.
+ */
+ const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
+ WARN_ON(idev->mc_qrv == 0);
+
+ if (mlh2->mld2q_qrv > 0)
+ idev->mc_qrv = mlh2->mld2q_qrv;
+
+ if (unlikely(idev->mc_qrv < min_qrv)) {
+ net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
+ idev->mc_qrv, min_qrv);
+ idev->mc_qrv = min_qrv;
+ }
+}
+
+static void mld_update_qi(struct inet6_dev *idev,
+ const struct mld2_query *mlh2)
+{
+ /* RFC3810, relevant sections:
+ * - 5.1.9. QQIC (Querier's Query Interval Code)
+ * - 9.2. Query Interval
+ * - 9.12. Older Version Querier Present Timeout
+ * (the [Query Interval] in the last Query received)
+ */
+ unsigned long mc_qqi;
+
+ if (mlh2->mld2q_qqic < 128) {
+ mc_qqi = mlh2->mld2q_qqic;
+ } else {
+ unsigned long mc_man, mc_exp;
+
+ mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
+ mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
+
+ mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
+ }
+
+ idev->mc_qi = mc_qqi * HZ;
+}
+
+static void mld_update_qri(struct inet6_dev *idev,
+ const struct mld2_query *mlh2)
+{
+ /* RFC3810, relevant sections:
+ * - 5.1.3. Maximum Response Code
+ * - 9.3. Query Response Interval
+ */
+ idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
+}
+
+static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
+ unsigned long *max_delay, bool v1_query)
+{
+ unsigned long mldv1_md;
+
+ /* Ignore v1 queries */
+ if (mld_in_v2_mode_only(idev))
+ return -EINVAL;
+
+ mldv1_md = ntohs(mld->mld_maxdelay);
+
+ /* When in MLDv1 fallback and a MLDv2 router start-up being
+ * unaware of current MLDv1 operation, the MRC == MRD mapping
+ * only works when the exponential algorithm is not being
+ * used (as MLDv1 is unaware of such things).
+ *
+ * According to the RFC author, the MLDv2 implementations
+ * he's aware of all use a MRC < 32768 on start up queries.
+ *
+ * Thus, should we *ever* encounter something else larger
+ * than that, just assume the maximum possible within our
+ * reach.
+ */
+ if (!v1_query)
+ mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
+
+ *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
+
+ /* MLDv1 router present: we need to go into v1 mode *only*
+ * when an MLDv1 query is received as per section 9.12. of
+ * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
+ * queries MUST be of exactly 24 octets.
+ */
+ if (v1_query)
+ mld_set_v1_mode(idev);
+
+ /* cancel MLDv2 report timer */
+ mld_gq_stop_timer(idev);
+ /* cancel the interface change timer */
+ mld_ifc_stop_timer(idev);
+ /* clear deleted report items */
+ mld_clear_delrec(idev);
+
+ return 0;
+}
+
+static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
+ unsigned long *max_delay)
+{
+ *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
+
+ mld_update_qrv(idev, mld);
+ mld_update_qi(idev, mld);
+ mld_update_qri(idev, mld);
+
+ idev->mc_maxdelay = *max_delay;
+
+ return 0;
+}
+
+/* called with rcu_read_lock() */
+int igmp6_event_query(struct sk_buff *skb)
+{
+ struct mld2_query *mlh2 = NULL;
+ struct ifmcaddr6 *ma;
+ const struct in6_addr *group;
+ unsigned long max_delay;
+ struct inet6_dev *idev;
+ struct mld_msg *mld;
+ int group_type;
+ int mark = 0;
+ int len, err;
+
+ if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
+ return -EINVAL;
+
+ /* compute payload length excluding extension headers */
+ len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
+ len -= skb_network_header_len(skb);
+
+ /* RFC3810 6.2
+ * Upon reception of an MLD message that contains a Query, the node
+ * checks if the source address of the message is a valid link-local
+ * address, if the Hop Limit is set to 1, and if the Router Alert
+ * option is present in the Hop-By-Hop Options header of the IPv6
+ * packet. If any of these checks fails, the packet is dropped.
+ */
+ if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
+ ipv6_hdr(skb)->hop_limit != 1 ||
+ !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
+ IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
+ return -EINVAL;
+
+ idev = __in6_dev_get(skb->dev);
+ if (!idev)
+ return 0;
+
+ mld = (struct mld_msg *)icmp6_hdr(skb);
+ group = &mld->mld_mca;
+ group_type = ipv6_addr_type(group);
+
+ if (group_type != IPV6_ADDR_ANY &&
+ !(group_type&IPV6_ADDR_MULTICAST))
+ return -EINVAL;
+
+ if (len < MLD_V1_QUERY_LEN) {
+ return -EINVAL;
+ } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
+ err = mld_process_v1(idev, mld, &max_delay,
+ len == MLD_V1_QUERY_LEN);
+ if (err < 0)
+ return err;
+ } else if (len >= MLD_V2_QUERY_LEN_MIN) {
+ int srcs_offset = sizeof(struct mld2_query) -
+ sizeof(struct icmp6hdr);
+
+ if (!pskb_may_pull(skb, srcs_offset))
+ return -EINVAL;
+
+ mlh2 = (struct mld2_query *)skb_transport_header(skb);
+
+ err = mld_process_v2(idev, mlh2, &max_delay);
+ if (err < 0)
+ return err;
+
+ if (group_type == IPV6_ADDR_ANY) { /* general query */
+ if (mlh2->mld2q_nsrcs)
+ return -EINVAL; /* no sources allowed */
+
+ mld_gq_start_timer(idev);
+ return 0;
+ }
+ /* mark sources to include, if group & source-specific */
+ if (mlh2->mld2q_nsrcs != 0) {
+ if (!pskb_may_pull(skb, srcs_offset +
+ ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
+ return -EINVAL;
+
+ mlh2 = (struct mld2_query *)skb_transport_header(skb);
+ mark = 1;
+ }
+ } else {
+ return -EINVAL;
+ }
+
+ read_lock_bh(&idev->lock);
+ if (group_type == IPV6_ADDR_ANY) {
+ for (ma = idev->mc_list; ma; ma = ma->next) {
+ spin_lock_bh(&ma->mca_lock);
+ igmp6_group_queried(ma, max_delay);
+ spin_unlock_bh(&ma->mca_lock);
+ }
+ } else {
+ for (ma = idev->mc_list; ma; ma = ma->next) {
+ if (!ipv6_addr_equal(group, &ma->mca_addr))
+ continue;
+ spin_lock_bh(&ma->mca_lock);
+ if (ma->mca_flags & MAF_TIMER_RUNNING) {
+ /* gsquery <- gsquery && mark */
+ if (!mark)
+ ma->mca_flags &= ~MAF_GSQUERY;
+ } else {
+ /* gsquery <- mark */
+ if (mark)
+ ma->mca_flags |= MAF_GSQUERY;
+ else
+ ma->mca_flags &= ~MAF_GSQUERY;
+ }
+ if (!(ma->mca_flags & MAF_GSQUERY) ||
+ mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
+ igmp6_group_queried(ma, max_delay);
+ spin_unlock_bh(&ma->mca_lock);
+ break;
+ }
+ }
+ read_unlock_bh(&idev->lock);
+
+ return 0;
+}
+
+/* called with rcu_read_lock() */
+int igmp6_event_report(struct sk_buff *skb)
+{
+ struct ifmcaddr6 *ma;
+ struct inet6_dev *idev;
+ struct mld_msg *mld;
+ int addr_type;
+
+ /* Our own report looped back. Ignore it. */
+ if (skb->pkt_type == PACKET_LOOPBACK)
+ return 0;
+
+ /* send our report if the MC router may not have heard this report */
+ if (skb->pkt_type != PACKET_MULTICAST &&
+ skb->pkt_type != PACKET_BROADCAST)
+ return 0;
+
+ if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
+ return -EINVAL;
+
+ mld = (struct mld_msg *)icmp6_hdr(skb);
+
+ /* Drop reports with not link local source */
+ addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
+ if (addr_type != IPV6_ADDR_ANY &&
+ !(addr_type&IPV6_ADDR_LINKLOCAL))
+ return -EINVAL;
+
+ idev = __in6_dev_get(skb->dev);
+ if (!idev)
+ return -ENODEV;
+
+ /*
+ * Cancel the timer for this group
+ */
+
+ read_lock_bh(&idev->lock);
+ for (ma = idev->mc_list; ma; ma = ma->next) {
+ if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
+ spin_lock(&ma->mca_lock);
+ if (del_timer(&ma->mca_timer))
+ refcount_dec(&ma->mca_refcnt);
+ ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
+ spin_unlock(&ma->mca_lock);
+ break;
+ }
+ }
+ read_unlock_bh(&idev->lock);
+ return 0;
+}
+
+static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
+ int gdeleted, int sdeleted)
+{
+ switch (type) {
+ case MLD2_MODE_IS_INCLUDE:
+ case MLD2_MODE_IS_EXCLUDE:
+ if (gdeleted || sdeleted)
+ return false;
+ if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
+ if (pmc->mca_sfmode == MCAST_INCLUDE)
+ return true;
+ /* don't include if this source is excluded
+ * in all filters
+ */
+ if (psf->sf_count[MCAST_INCLUDE])
+ return type == MLD2_MODE_IS_INCLUDE;
+ return pmc->mca_sfcount[MCAST_EXCLUDE] ==
+ psf->sf_count[MCAST_EXCLUDE];
+ }
+ return false;
+ case MLD2_CHANGE_TO_INCLUDE:
+ if (gdeleted || sdeleted)
+ return false;
+ return psf->sf_count[MCAST_INCLUDE] != 0;
+ case MLD2_CHANGE_TO_EXCLUDE:
+ if (gdeleted || sdeleted)
+ return false;
+ if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
+ psf->sf_count[MCAST_INCLUDE])
+ return false;
+ return pmc->mca_sfcount[MCAST_EXCLUDE] ==
+ psf->sf_count[MCAST_EXCLUDE];
+ case MLD2_ALLOW_NEW_SOURCES:
+ if (gdeleted || !psf->sf_crcount)
+ return false;
+ return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
+ case MLD2_BLOCK_OLD_SOURCES:
+ if (pmc->mca_sfmode == MCAST_INCLUDE)
+ return gdeleted || (psf->sf_crcount && sdeleted);
+ return psf->sf_crcount && !gdeleted && !sdeleted;
+ }
+ return false;
+}
+
+static int
+mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
+{
+ struct ip6_sf_list *psf;
+ int scount = 0;
+
+ for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
+ if (!is_in(pmc, psf, type, gdeleted, sdeleted))
+ continue;
+ scount++;
+ }
+ return scount;
+}
+
+static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
+ struct net_device *dev,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ int proto, int len)
+{
+ struct ipv6hdr *hdr;
+
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->dev = dev;
+
+ skb_reset_network_header(skb);
+ skb_put(skb, sizeof(struct ipv6hdr));
+ hdr = ipv6_hdr(skb);
+
+ ip6_flow_hdr(hdr, 0, 0);
+
+ hdr->payload_len = htons(len);
+ hdr->nexthdr = proto;
+ hdr->hop_limit = inet6_sk(sk)->hop_limit;
+
+ hdr->saddr = *saddr;
+ hdr->daddr = *daddr;
+}
+
+static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
+{
+ struct net_device *dev = idev->dev;
+ struct net *net = dev_net(dev);
+ struct sock *sk = net->ipv6.igmp_sk;
+ struct sk_buff *skb;
+ struct mld2_report *pmr;
+ struct in6_addr addr_buf;
+ const struct in6_addr *saddr;
+ int hlen = LL_RESERVED_SPACE(dev);
+ int tlen = dev->needed_tailroom;
+ unsigned int size = mtu + hlen + tlen;
+ int err;
+ u8 ra[8] = { IPPROTO_ICMPV6, 0,
+ IPV6_TLV_ROUTERALERT, 2, 0, 0,
+ IPV6_TLV_PADN, 0 };
+
+ /* we assume size > sizeof(ra) here */
+ /* limit our allocations to order-0 page */
+ size = min_t(int, size, SKB_MAX_ORDER(0, 0));
+ skb = sock_alloc_send_skb(sk, size, 1, &err);
+
+ if (!skb)
+ return NULL;
+
+ skb->priority = TC_PRIO_CONTROL;
+ skb_reserve(skb, hlen);
+ skb_tailroom_reserve(skb, mtu, tlen);
+
+ if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
+ /* <draft-ietf-magma-mld-source-05.txt>:
+ * use unspecified address as the source address
+ * when a valid link-local address is not available.
+ */
+ saddr = &in6addr_any;
+ } else
+ saddr = &addr_buf;
+
+ ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
+
+ skb_put_data(skb, ra, sizeof(ra));
+
+ skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
+ skb_put(skb, sizeof(*pmr));
+ pmr = (struct mld2_report *)skb_transport_header(skb);
+ pmr->mld2r_type = ICMPV6_MLD2_REPORT;
+ pmr->mld2r_resv1 = 0;
+ pmr->mld2r_cksum = 0;
+ pmr->mld2r_resv2 = 0;
+ pmr->mld2r_ngrec = 0;
+ return skb;
+}
+
+static void mld_sendpack(struct sk_buff *skb)
+{
+ struct ipv6hdr *pip6 = ipv6_hdr(skb);
+ struct mld2_report *pmr =
+ (struct mld2_report *)skb_transport_header(skb);
+ int payload_len, mldlen;
+ struct inet6_dev *idev;
+ struct net *net = dev_net(skb->dev);
+ int err;
+ struct flowi6 fl6;
+ struct dst_entry *dst;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(skb->dev);
+ IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
+
+ payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
+ sizeof(*pip6);
+ mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
+ pip6->payload_len = htons(payload_len);
+
+ pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
+ IPPROTO_ICMPV6,
+ csum_partial(skb_transport_header(skb),
+ mldlen, 0));
+
+ icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
+ &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
+ skb->dev->ifindex);
+ dst = icmp6_dst_alloc(skb->dev, &fl6);
+
+ err = 0;
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ dst = NULL;
+ }
+ skb_dst_set(skb, dst);
+ if (err)
+ goto err_out;
+
+ err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
+ net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
+ dst_output);
+out:
+ if (!err) {
+ ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
+ ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
+ } else {
+ IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
+ }
+
+ rcu_read_unlock();
+ return;
+
+err_out:
+ kfree_skb(skb);
+ goto out;
+}
+
+static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
+{
+ return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
+}
+
+static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
+ int type, struct mld2_grec **ppgr, unsigned int mtu)
+{
+ struct mld2_report *pmr;
+ struct mld2_grec *pgr;
+
+ if (!skb) {
+ skb = mld_newpack(pmc->idev, mtu);
+ if (!skb)
+ return NULL;
+ }
+ pgr = skb_put(skb, sizeof(struct mld2_grec));
+ pgr->grec_type = type;
+ pgr->grec_auxwords = 0;
+ pgr->grec_nsrcs = 0;
+ pgr->grec_mca = pmc->mca_addr; /* structure copy */
+ pmr = (struct mld2_report *)skb_transport_header(skb);
+ pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
+ *ppgr = pgr;
+ return skb;
+}
+
+#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
+
+static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
+ int type, int gdeleted, int sdeleted, int crsend)
+{
+ struct inet6_dev *idev = pmc->idev;
+ struct net_device *dev = idev->dev;
+ struct mld2_report *pmr;
+ struct mld2_grec *pgr = NULL;
+ struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
+ int scount, stotal, first, isquery, truncate;
+ unsigned int mtu;
+
+ if (pmc->mca_flags & MAF_NOREPORT)
+ return skb;
+
+ mtu = READ_ONCE(dev->mtu);
+ if (mtu < IPV6_MIN_MTU)
+ return skb;
+
+ isquery = type == MLD2_MODE_IS_INCLUDE ||
+ type == MLD2_MODE_IS_EXCLUDE;
+ truncate = type == MLD2_MODE_IS_EXCLUDE ||
+ type == MLD2_CHANGE_TO_EXCLUDE;
+
+ stotal = scount = 0;
+
+ psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
+
+ if (!*psf_list)
+ goto empty_source;
+
+ pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
+
+ /* EX and TO_EX get a fresh packet, if needed */
+ if (truncate) {
+ if (pmr && pmr->mld2r_ngrec &&
+ AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
+ if (skb)
+ mld_sendpack(skb);
+ skb = mld_newpack(idev, mtu);
+ }
+ }
+ first = 1;
+ psf_prev = NULL;
+ for (psf = *psf_list; psf; psf = psf_next) {
+ struct in6_addr *psrc;
+
+ psf_next = psf->sf_next;
+
+ if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
+ psf_prev = psf;
+ continue;
+ }
+
+ /* Based on RFC3810 6.1. Should not send source-list change
+ * records when there is a filter mode change.
+ */
+ if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
+ (!gdeleted && pmc->mca_crcount)) &&
+ (type == MLD2_ALLOW_NEW_SOURCES ||
+ type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
+ goto decrease_sf_crcount;
+
+ /* clear marks on query responses */
+ if (isquery)
+ psf->sf_gsresp = 0;
+
+ if (AVAILABLE(skb) < sizeof(*psrc) +
+ first*sizeof(struct mld2_grec)) {
+ if (truncate && !first)
+ break; /* truncate these */
+ if (pgr)
+ pgr->grec_nsrcs = htons(scount);
+ if (skb)
+ mld_sendpack(skb);
+ skb = mld_newpack(idev, mtu);
+ first = 1;
+ scount = 0;
+ }
+ if (first) {
+ skb = add_grhead(skb, pmc, type, &pgr, mtu);
+ first = 0;
+ }
+ if (!skb)
+ return NULL;
+ psrc = skb_put(skb, sizeof(*psrc));
+ *psrc = psf->sf_addr;
+ scount++; stotal++;
+ if ((type == MLD2_ALLOW_NEW_SOURCES ||
+ type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
+decrease_sf_crcount:
+ psf->sf_crcount--;
+ if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
+ if (psf_prev)
+ psf_prev->sf_next = psf->sf_next;
+ else
+ *psf_list = psf->sf_next;
+ kfree(psf);
+ continue;
+ }
+ }
+ psf_prev = psf;
+ }
+
+empty_source:
+ if (!stotal) {
+ if (type == MLD2_ALLOW_NEW_SOURCES ||
+ type == MLD2_BLOCK_OLD_SOURCES)
+ return skb;
+ if (pmc->mca_crcount || isquery || crsend) {
+ /* make sure we have room for group header */
+ if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
+ mld_sendpack(skb);
+ skb = NULL; /* add_grhead will get a new one */
+ }
+ skb = add_grhead(skb, pmc, type, &pgr, mtu);
+ }
+ }
+ if (pgr)
+ pgr->grec_nsrcs = htons(scount);
+
+ if (isquery)
+ pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
+ return skb;
+}
+
+static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
+{
+ struct sk_buff *skb = NULL;
+ int type;
+
+ read_lock_bh(&idev->lock);
+ if (!pmc) {
+ for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
+ if (pmc->mca_flags & MAF_NOREPORT)
+ continue;
+ spin_lock_bh(&pmc->mca_lock);
+ if (pmc->mca_sfcount[MCAST_EXCLUDE])
+ type = MLD2_MODE_IS_EXCLUDE;
+ else
+ type = MLD2_MODE_IS_INCLUDE;
+ skb = add_grec(skb, pmc, type, 0, 0, 0);
+ spin_unlock_bh(&pmc->mca_lock);
+ }
+ } else {
+ spin_lock_bh(&pmc->mca_lock);
+ if (pmc->mca_sfcount[MCAST_EXCLUDE])
+ type = MLD2_MODE_IS_EXCLUDE;
+ else
+ type = MLD2_MODE_IS_INCLUDE;
+ skb = add_grec(skb, pmc, type, 0, 0, 0);
+ spin_unlock_bh(&pmc->mca_lock);
+ }
+ read_unlock_bh(&idev->lock);
+ if (skb)
+ mld_sendpack(skb);
+}
+
+/*
+ * remove zero-count source records from a source filter list
+ */
+static void mld_clear_zeros(struct ip6_sf_list **ppsf)
+{
+ struct ip6_sf_list *psf_prev, *psf_next, *psf;
+
+ psf_prev = NULL;
+ for (psf = *ppsf; psf; psf = psf_next) {
+ psf_next = psf->sf_next;
+ if (psf->sf_crcount == 0) {
+ if (psf_prev)
+ psf_prev->sf_next = psf->sf_next;
+ else
+ *ppsf = psf->sf_next;
+ kfree(psf);
+ } else
+ psf_prev = psf;
+ }
+}
+
+static void mld_send_cr(struct inet6_dev *idev)
+{
+ struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
+ struct sk_buff *skb = NULL;
+ int type, dtype;
+
+ read_lock_bh(&idev->lock);
+ spin_lock(&idev->mc_lock);
+
+ /* deleted MCA's */
+ pmc_prev = NULL;
+ for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
+ pmc_next = pmc->next;
+ if (pmc->mca_sfmode == MCAST_INCLUDE) {
+ type = MLD2_BLOCK_OLD_SOURCES;
+ dtype = MLD2_BLOCK_OLD_SOURCES;
+ skb = add_grec(skb, pmc, type, 1, 0, 0);
+ skb = add_grec(skb, pmc, dtype, 1, 1, 0);
+ }
+ if (pmc->mca_crcount) {
+ if (pmc->mca_sfmode == MCAST_EXCLUDE) {
+ type = MLD2_CHANGE_TO_INCLUDE;
+ skb = add_grec(skb, pmc, type, 1, 0, 0);
+ }
+ pmc->mca_crcount--;
+ if (pmc->mca_crcount == 0) {
+ mld_clear_zeros(&pmc->mca_tomb);
+ mld_clear_zeros(&pmc->mca_sources);
+ }
+ }
+ if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
+ !pmc->mca_sources) {
+ if (pmc_prev)
+ pmc_prev->next = pmc_next;
+ else
+ idev->mc_tomb = pmc_next;
+ in6_dev_put(pmc->idev);
+ kfree(pmc);
+ } else
+ pmc_prev = pmc;
+ }
+ spin_unlock(&idev->mc_lock);
+
+ /* change recs */
+ for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
+ spin_lock_bh(&pmc->mca_lock);
+ if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
+ type = MLD2_BLOCK_OLD_SOURCES;
+ dtype = MLD2_ALLOW_NEW_SOURCES;
+ } else {
+ type = MLD2_ALLOW_NEW_SOURCES;
+ dtype = MLD2_BLOCK_OLD_SOURCES;
+ }
+ skb = add_grec(skb, pmc, type, 0, 0, 0);
+ skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
+
+ /* filter mode changes */
+ if (pmc->mca_crcount) {
+ if (pmc->mca_sfmode == MCAST_EXCLUDE)
+ type = MLD2_CHANGE_TO_EXCLUDE;
+ else
+ type = MLD2_CHANGE_TO_INCLUDE;
+ skb = add_grec(skb, pmc, type, 0, 0, 0);
+ pmc->mca_crcount--;
+ }
+ spin_unlock_bh(&pmc->mca_lock);
+ }
+ read_unlock_bh(&idev->lock);
+ if (!skb)
+ return;
+ (void) mld_sendpack(skb);
+}
+
+static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
+{
+ struct net *net = dev_net(dev);
+ struct sock *sk = net->ipv6.igmp_sk;
+ struct inet6_dev *idev;
+ struct sk_buff *skb;
+ struct mld_msg *hdr;
+ const struct in6_addr *snd_addr, *saddr;
+ struct in6_addr addr_buf;
+ int hlen = LL_RESERVED_SPACE(dev);
+ int tlen = dev->needed_tailroom;
+ int err, len, payload_len, full_len;
+ u8 ra[8] = { IPPROTO_ICMPV6, 0,
+ IPV6_TLV_ROUTERALERT, 2, 0, 0,
+ IPV6_TLV_PADN, 0 };
+ struct flowi6 fl6;
+ struct dst_entry *dst;
+
+ if (type == ICMPV6_MGM_REDUCTION)
+ snd_addr = &in6addr_linklocal_allrouters;
+ else
+ snd_addr = addr;
+
+ len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
+ payload_len = len + sizeof(ra);
+ full_len = sizeof(struct ipv6hdr) + payload_len;
+
+ rcu_read_lock();
+ IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
+ IPSTATS_MIB_OUT, full_len);
+ rcu_read_unlock();
+
+ skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
+
+ if (!skb) {
+ rcu_read_lock();
+ IP6_INC_STATS(net, __in6_dev_get(dev),
+ IPSTATS_MIB_OUTDISCARDS);
+ rcu_read_unlock();
+ return;
+ }
+ skb->priority = TC_PRIO_CONTROL;
+ skb_reserve(skb, hlen);
+
+ if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
+ /* <draft-ietf-magma-mld-source-05.txt>:
+ * use unspecified address as the source address
+ * when a valid link-local address is not available.
+ */
+ saddr = &in6addr_any;
+ } else
+ saddr = &addr_buf;
+
+ ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
+
+ skb_put_data(skb, ra, sizeof(ra));
+
+ hdr = skb_put_zero(skb, sizeof(struct mld_msg));
+ hdr->mld_type = type;
+ hdr->mld_mca = *addr;
+
+ hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
+ IPPROTO_ICMPV6,
+ csum_partial(hdr, len, 0));
+
+ rcu_read_lock();
+ idev = __in6_dev_get(skb->dev);
+
+ icmpv6_flow_init(sk, &fl6, type,
+ &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
+ skb->dev->ifindex);
+ dst = icmp6_dst_alloc(skb->dev, &fl6);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ goto err_out;
+ }
+
+ skb_dst_set(skb, dst);
+ err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
+ net, sk, skb, NULL, skb->dev,
+ dst_output);
+out:
+ if (!err) {
+ ICMP6MSGOUT_INC_STATS(net, idev, type);
+ ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
+ } else
+ IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
+
+ rcu_read_unlock();
+ return;
+
+err_out:
+ kfree_skb(skb);
+ goto out;
+}
+
+static void mld_send_initial_cr(struct inet6_dev *idev)
+{
+ struct sk_buff *skb;
+ struct ifmcaddr6 *pmc;
+ int type;
+
+ if (mld_in_v1_mode(idev))
+ return;
+
+ skb = NULL;
+ read_lock_bh(&idev->lock);
+ for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
+ spin_lock_bh(&pmc->mca_lock);
+ if (pmc->mca_sfcount[MCAST_EXCLUDE])
+ type = MLD2_CHANGE_TO_EXCLUDE;
+ else
+ type = MLD2_ALLOW_NEW_SOURCES;
+ skb = add_grec(skb, pmc, type, 0, 0, 1);
+ spin_unlock_bh(&pmc->mca_lock);
+ }
+ read_unlock_bh(&idev->lock);
+ if (skb)
+ mld_sendpack(skb);
+}
+
+void ipv6_mc_dad_complete(struct inet6_dev *idev)
+{
+ idev->mc_dad_count = idev->mc_qrv;
+ if (idev->mc_dad_count) {
+ mld_send_initial_cr(idev);
+ idev->mc_dad_count--;
+ if (idev->mc_dad_count)
+ mld_dad_start_timer(idev,
+ unsolicited_report_interval(idev));
+ }
+}
+
+static void mld_dad_timer_expire(struct timer_list *t)
+{
+ struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
+
+ mld_send_initial_cr(idev);
+ if (idev->mc_dad_count) {
+ idev->mc_dad_count--;
+ if (idev->mc_dad_count)
+ mld_dad_start_timer(idev,
+ unsolicited_report_interval(idev));
+ }
+ in6_dev_put(idev);
+}
+
+static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
+ const struct in6_addr *psfsrc)
+{
+ struct ip6_sf_list *psf, *psf_prev;
+ int rv = 0;
+
+ psf_prev = NULL;
+ for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
+ if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
+ break;
+ psf_prev = psf;
+ }
+ if (!psf || psf->sf_count[sfmode] == 0) {
+ /* source filter not found, or count wrong => bug */
+ return -ESRCH;
+ }
+ psf->sf_count[sfmode]--;
+ if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
+ struct inet6_dev *idev = pmc->idev;
+
+ /* no more filters for this source */
+ if (psf_prev)
+ psf_prev->sf_next = psf->sf_next;
+ else
+ pmc->mca_sources = psf->sf_next;
+ if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
+ !mld_in_v1_mode(idev)) {
+ psf->sf_crcount = idev->mc_qrv;
+ psf->sf_next = pmc->mca_tomb;
+ pmc->mca_tomb = psf;
+ rv = 1;
+ } else
+ kfree(psf);
+ }
+ return rv;
+}
+
+static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
+ int sfmode, int sfcount, const struct in6_addr *psfsrc,
+ int delta)
+{
+ struct ifmcaddr6 *pmc;
+ int changerec = 0;
+ int i, err;
+
+ if (!idev)
+ return -ENODEV;
+ read_lock_bh(&idev->lock);
+ for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
+ if (ipv6_addr_equal(pmca, &pmc->mca_addr))
+ break;
+ }
+ if (!pmc) {
+ /* MCA not found?? bug */
+ read_unlock_bh(&idev->lock);
+ return -ESRCH;
+ }
+ spin_lock_bh(&pmc->mca_lock);
+ sf_markstate(pmc);
+ if (!delta) {
+ if (!pmc->mca_sfcount[sfmode]) {
+ spin_unlock_bh(&pmc->mca_lock);
+ read_unlock_bh(&idev->lock);
+ return -EINVAL;
+ }
+ pmc->mca_sfcount[sfmode]--;
+ }
+ err = 0;
+ for (i = 0; i < sfcount; i++) {
+ int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
+
+ changerec |= rv > 0;
+ if (!err && rv < 0)
+ err = rv;
+ }
+ if (pmc->mca_sfmode == MCAST_EXCLUDE &&
+ pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
+ pmc->mca_sfcount[MCAST_INCLUDE]) {
+ struct ip6_sf_list *psf;
+
+ /* filter mode change */
+ pmc->mca_sfmode = MCAST_INCLUDE;
+ pmc->mca_crcount = idev->mc_qrv;
+ idev->mc_ifc_count = pmc->mca_crcount;
+ for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
+ psf->sf_crcount = 0;
+ mld_ifc_event(pmc->idev);
+ } else if (sf_setstate(pmc) || changerec)
+ mld_ifc_event(pmc->idev);
+ spin_unlock_bh(&pmc->mca_lock);
+ read_unlock_bh(&idev->lock);
+ return err;
+}
+
+/*
+ * Add multicast single-source filter to the interface list
+ */
+static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
+ const struct in6_addr *psfsrc)
+{
+ struct ip6_sf_list *psf, *psf_prev;
+
+ psf_prev = NULL;
+ for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
+ if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
+ break;
+ psf_prev = psf;
+ }
+ if (!psf) {
+ psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
+ if (!psf)
+ return -ENOBUFS;
+
+ psf->sf_addr = *psfsrc;
+ if (psf_prev) {
+ psf_prev->sf_next = psf;
+ } else
+ pmc->mca_sources = psf;
+ }
+ psf->sf_count[sfmode]++;
+ return 0;
+}
+
+static void sf_markstate(struct ifmcaddr6 *pmc)
+{
+ struct ip6_sf_list *psf;
+ int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
+
+ for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
+ if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
+ psf->sf_oldin = mca_xcount ==
+ psf->sf_count[MCAST_EXCLUDE] &&
+ !psf->sf_count[MCAST_INCLUDE];
+ } else
+ psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
+}
+
+static int sf_setstate(struct ifmcaddr6 *pmc)
+{
+ struct ip6_sf_list *psf, *dpsf;
+ int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
+ int qrv = pmc->idev->mc_qrv;
+ int new_in, rv;
+
+ rv = 0;
+ for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
+ if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
+ new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
+ !psf->sf_count[MCAST_INCLUDE];
+ } else
+ new_in = psf->sf_count[MCAST_INCLUDE] != 0;
+ if (new_in) {
+ if (!psf->sf_oldin) {
+ struct ip6_sf_list *prev = NULL;
+
+ for (dpsf = pmc->mca_tomb; dpsf;
+ dpsf = dpsf->sf_next) {
+ if (ipv6_addr_equal(&dpsf->sf_addr,
+ &psf->sf_addr))
+ break;
+ prev = dpsf;
+ }
+ if (dpsf) {
+ if (prev)
+ prev->sf_next = dpsf->sf_next;
+ else
+ pmc->mca_tomb = dpsf->sf_next;
+ kfree(dpsf);
+ }
+ psf->sf_crcount = qrv;
+ rv++;
+ }
+ } else if (psf->sf_oldin) {
+ psf->sf_crcount = 0;
+ /*
+ * add or update "delete" records if an active filter
+ * is now inactive
+ */
+ for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
+ if (ipv6_addr_equal(&dpsf->sf_addr,
+ &psf->sf_addr))
+ break;
+ if (!dpsf) {
+ dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
+ if (!dpsf)
+ continue;
+ *dpsf = *psf;
+ /* pmc->mca_lock held by callers */
+ dpsf->sf_next = pmc->mca_tomb;
+ pmc->mca_tomb = dpsf;
+ }
+ dpsf->sf_crcount = qrv;
+ rv++;
+ }
+ }
+ return rv;
+}
+
+/*
+ * Add multicast source filter list to the interface list
+ */
+static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
+ int sfmode, int sfcount, const struct in6_addr *psfsrc,
+ int delta)
+{
+ struct ifmcaddr6 *pmc;
+ int isexclude;
+ int i, err;
+
+ if (!idev)
+ return -ENODEV;
+ read_lock_bh(&idev->lock);
+ for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
+ if (ipv6_addr_equal(pmca, &pmc->mca_addr))
+ break;
+ }
+ if (!pmc) {
+ /* MCA not found?? bug */
+ read_unlock_bh(&idev->lock);
+ return -ESRCH;
+ }
+ spin_lock_bh(&pmc->mca_lock);
+
+ sf_markstate(pmc);
+ isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
+ if (!delta)
+ pmc->mca_sfcount[sfmode]++;
+ err = 0;
+ for (i = 0; i < sfcount; i++) {
+ err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
+ if (err)
+ break;
+ }
+ if (err) {
+ int j;
+
+ if (!delta)
+ pmc->mca_sfcount[sfmode]--;
+ for (j = 0; j < i; j++)
+ ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
+ } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
+ struct ip6_sf_list *psf;
+
+ /* filter mode change */
+ if (pmc->mca_sfcount[MCAST_EXCLUDE])
+ pmc->mca_sfmode = MCAST_EXCLUDE;
+ else if (pmc->mca_sfcount[MCAST_INCLUDE])
+ pmc->mca_sfmode = MCAST_INCLUDE;
+ /* else no filters; keep old mode for reports */
+
+ pmc->mca_crcount = idev->mc_qrv;
+ idev->mc_ifc_count = pmc->mca_crcount;
+ for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
+ psf->sf_crcount = 0;
+ mld_ifc_event(idev);
+ } else if (sf_setstate(pmc))
+ mld_ifc_event(idev);
+ spin_unlock_bh(&pmc->mca_lock);
+ read_unlock_bh(&idev->lock);
+ return err;
+}
+
+static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
+{
+ struct ip6_sf_list *psf, *nextpsf;
+
+ for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
+ nextpsf = psf->sf_next;
+ kfree(psf);
+ }
+ pmc->mca_tomb = NULL;
+ for (psf = pmc->mca_sources; psf; psf = nextpsf) {
+ nextpsf = psf->sf_next;
+ kfree(psf);
+ }
+ pmc->mca_sources = NULL;
+ pmc->mca_sfmode = MCAST_EXCLUDE;
+ pmc->mca_sfcount[MCAST_INCLUDE] = 0;
+ pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
+}
+
+
+static void igmp6_join_group(struct ifmcaddr6 *ma)
+{
+ unsigned long delay;
+
+ if (ma->mca_flags & MAF_NOREPORT)
+ return;
+
+ igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
+
+ delay = prandom_u32() % unsolicited_report_interval(ma->idev);
+
+ spin_lock_bh(&ma->mca_lock);
+ if (del_timer(&ma->mca_timer)) {
+ refcount_dec(&ma->mca_refcnt);
+ delay = ma->mca_timer.expires - jiffies;
+ }
+
+ if (!mod_timer(&ma->mca_timer, jiffies + delay))
+ refcount_inc(&ma->mca_refcnt);
+ ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
+ spin_unlock_bh(&ma->mca_lock);
+}
+
+static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
+ struct inet6_dev *idev)
+{
+ int err;
+
+ write_lock_bh(&iml->sflock);
+ if (!iml->sflist) {
+ /* any-source empty exclude case */
+ err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
+ } else {
+ err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
+ iml->sflist->sl_count, iml->sflist->sl_addr, 0);
+ sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
+ iml->sflist = NULL;
+ }
+ write_unlock_bh(&iml->sflock);
+ return err;
+}
+
+static void igmp6_leave_group(struct ifmcaddr6 *ma)
+{
+ if (mld_in_v1_mode(ma->idev)) {
+ if (ma->mca_flags & MAF_LAST_REPORTER)
+ igmp6_send(&ma->mca_addr, ma->idev->dev,
+ ICMPV6_MGM_REDUCTION);
+ } else {
+ mld_add_delrec(ma->idev, ma);
+ mld_ifc_event(ma->idev);
+ }
+}
+
+static void mld_gq_timer_expire(struct timer_list *t)
+{
+ struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
+
+ idev->mc_gq_running = 0;
+ mld_send_report(idev, NULL);
+ in6_dev_put(idev);
+}
+
+static void mld_ifc_timer_expire(struct timer_list *t)
+{
+ struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
+
+ mld_send_cr(idev);
+ if (idev->mc_ifc_count) {
+ idev->mc_ifc_count--;
+ if (idev->mc_ifc_count)
+ mld_ifc_start_timer(idev,
+ unsolicited_report_interval(idev));
+ }
+ in6_dev_put(idev);
+}
+
+static void mld_ifc_event(struct inet6_dev *idev)
+{
+ if (mld_in_v1_mode(idev))
+ return;
+ idev->mc_ifc_count = idev->mc_qrv;
+ mld_ifc_start_timer(idev, 1);
+}
+
+static void igmp6_timer_handler(struct timer_list *t)
+{
+ struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
+
+ if (mld_in_v1_mode(ma->idev))
+ igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
+ else
+ mld_send_report(ma->idev, ma);
+
+ spin_lock(&ma->mca_lock);
+ ma->mca_flags |= MAF_LAST_REPORTER;
+ ma->mca_flags &= ~MAF_TIMER_RUNNING;
+ spin_unlock(&ma->mca_lock);
+ ma_put(ma);
+}
+
+/* Device changing type */
+
+void ipv6_mc_unmap(struct inet6_dev *idev)
+{
+ struct ifmcaddr6 *i;
+
+ /* Install multicast list, except for all-nodes (already installed) */
+
+ read_lock_bh(&idev->lock);
+ for (i = idev->mc_list; i; i = i->next)
+ igmp6_group_dropped(i);
+ read_unlock_bh(&idev->lock);
+}
+
+void ipv6_mc_remap(struct inet6_dev *idev)
+{
+ ipv6_mc_up(idev);
+}
+
+/* Device going down */
+
+void ipv6_mc_down(struct inet6_dev *idev)
+{
+ struct ifmcaddr6 *i;
+
+ /* Withdraw multicast list */
+
+ read_lock_bh(&idev->lock);
+
+ for (i = idev->mc_list; i; i = i->next)
+ igmp6_group_dropped(i);
+
+ /* Should stop timer after group drop. or we will
+ * start timer again in mld_ifc_event()
+ */
+ mld_ifc_stop_timer(idev);
+ mld_gq_stop_timer(idev);
+ mld_dad_stop_timer(idev);
+ read_unlock_bh(&idev->lock);
+}
+
+static void ipv6_mc_reset(struct inet6_dev *idev)
+{
+ idev->mc_qrv = sysctl_mld_qrv;
+ idev->mc_qi = MLD_QI_DEFAULT;
+ idev->mc_qri = MLD_QRI_DEFAULT;
+ idev->mc_v1_seen = 0;
+ idev->mc_maxdelay = unsolicited_report_interval(idev);
+}
+
+/* Device going up */
+
+void ipv6_mc_up(struct inet6_dev *idev)
+{
+ struct ifmcaddr6 *i;
+
+ /* Install multicast list, except for all-nodes (already installed) */
+
+ read_lock_bh(&idev->lock);
+ ipv6_mc_reset(idev);
+ for (i = idev->mc_list; i; i = i->next) {
+ mld_del_delrec(idev, i);
+ igmp6_group_added(i);
+ }
+ read_unlock_bh(&idev->lock);
+}
+
+/* IPv6 device initialization. */
+
+void ipv6_mc_init_dev(struct inet6_dev *idev)
+{
+ write_lock_bh(&idev->lock);
+ spin_lock_init(&idev->mc_lock);
+ idev->mc_gq_running = 0;
+ timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
+ idev->mc_tomb = NULL;
+ idev->mc_ifc_count = 0;
+ timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
+ timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
+ ipv6_mc_reset(idev);
+ write_unlock_bh(&idev->lock);
+}
+
+/*
+ * Device is about to be destroyed: clean up.
+ */
+
+void ipv6_mc_destroy_dev(struct inet6_dev *idev)
+{
+ struct ifmcaddr6 *i;
+
+ /* Deactivate timers */
+ ipv6_mc_down(idev);
+ mld_clear_delrec(idev);
+
+ /* Delete all-nodes address. */
+ /* We cannot call ipv6_dev_mc_dec() directly, our caller in
+ * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
+ * fail.
+ */
+ __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
+
+ if (idev->cnf.forwarding)
+ __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
+
+ write_lock_bh(&idev->lock);
+ while ((i = idev->mc_list) != NULL) {
+ idev->mc_list = i->next;
+
+ write_unlock_bh(&idev->lock);
+ ma_put(i);
+ write_lock_bh(&idev->lock);
+ }
+ write_unlock_bh(&idev->lock);
+}
+
+static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
+{
+ struct ifmcaddr6 *pmc;
+
+ ASSERT_RTNL();
+
+ if (mld_in_v1_mode(idev)) {
+ read_lock_bh(&idev->lock);
+ for (pmc = idev->mc_list; pmc; pmc = pmc->next)
+ igmp6_join_group(pmc);
+ read_unlock_bh(&idev->lock);
+ } else
+ mld_send_report(idev, NULL);
+}
+
+static int ipv6_mc_netdev_event(struct notifier_block *this,
+ unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct inet6_dev *idev = __in6_dev_get(dev);
+
+ switch (event) {
+ case NETDEV_RESEND_IGMP:
+ if (idev)
+ ipv6_mc_rejoin_groups(idev);
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block igmp6_netdev_notifier = {
+ .notifier_call = ipv6_mc_netdev_event,
+};
+
+#ifdef CONFIG_PROC_FS
+struct igmp6_mc_iter_state {
+ struct seq_net_private p;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+};
+
+#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
+
+static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
+{
+ struct ifmcaddr6 *im = NULL;
+ struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
+ struct net *net = seq_file_net(seq);
+
+ state->idev = NULL;
+ for_each_netdev_rcu(net, state->dev) {
+ struct inet6_dev *idev;
+ idev = __in6_dev_get(state->dev);
+ if (!idev)
+ continue;
+ read_lock_bh(&idev->lock);
+ im = idev->mc_list;
+ if (im) {
+ state->idev = idev;
+ break;
+ }
+ read_unlock_bh(&idev->lock);
+ }
+ return im;
+}
+
+static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
+{
+ struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
+
+ im = im->next;
+ while (!im) {
+ if (likely(state->idev))
+ read_unlock_bh(&state->idev->lock);
+
+ state->dev = next_net_device_rcu(state->dev);
+ if (!state->dev) {
+ state->idev = NULL;
+ break;
+ }
+ state->idev = __in6_dev_get(state->dev);
+ if (!state->idev)
+ continue;
+ read_lock_bh(&state->idev->lock);
+ im = state->idev->mc_list;
+ }
+ return im;
+}
+
+static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
+{
+ struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
+ if (im)
+ while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
+ --pos;
+ return pos ? NULL : im;
+}
+
+static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(RCU)
+{
+ rcu_read_lock();
+ return igmp6_mc_get_idx(seq, *pos);
+}
+
+static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
+
+ ++*pos;
+ return im;
+}
+
+static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
+ __releases(RCU)
+{
+ struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
+
+ if (likely(state->idev)) {
+ read_unlock_bh(&state->idev->lock);
+ state->idev = NULL;
+ }
+ state->dev = NULL;
+ rcu_read_unlock();
+}
+
+static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
+{
+ struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
+ struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
+
+ seq_printf(seq,
+ "%-4d %-15s %pi6 %5d %08X %ld\n",
+ state->dev->ifindex, state->dev->name,
+ &im->mca_addr,
+ im->mca_users, im->mca_flags,
+ (im->mca_flags&MAF_TIMER_RUNNING) ?
+ jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
+ return 0;
+}
+
+static const struct seq_operations igmp6_mc_seq_ops = {
+ .start = igmp6_mc_seq_start,
+ .next = igmp6_mc_seq_next,
+ .stop = igmp6_mc_seq_stop,
+ .show = igmp6_mc_seq_show,
+};
+
+struct igmp6_mcf_iter_state {
+ struct seq_net_private p;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+ struct ifmcaddr6 *im;
+};
+
+#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
+
+static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
+{
+ struct ip6_sf_list *psf = NULL;
+ struct ifmcaddr6 *im = NULL;
+ struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
+ struct net *net = seq_file_net(seq);
+
+ state->idev = NULL;
+ state->im = NULL;
+ for_each_netdev_rcu(net, state->dev) {
+ struct inet6_dev *idev;
+ idev = __in6_dev_get(state->dev);
+ if (unlikely(idev == NULL))
+ continue;
+ read_lock_bh(&idev->lock);
+ im = idev->mc_list;
+ if (likely(im)) {
+ spin_lock_bh(&im->mca_lock);
+ psf = im->mca_sources;
+ if (likely(psf)) {
+ state->im = im;
+ state->idev = idev;
+ break;
+ }
+ spin_unlock_bh(&im->mca_lock);
+ }
+ read_unlock_bh(&idev->lock);
+ }
+ return psf;
+}
+
+static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
+{
+ struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
+
+ psf = psf->sf_next;
+ while (!psf) {
+ spin_unlock_bh(&state->im->mca_lock);
+ state->im = state->im->next;
+ while (!state->im) {
+ if (likely(state->idev))
+ read_unlock_bh(&state->idev->lock);
+
+ state->dev = next_net_device_rcu(state->dev);
+ if (!state->dev) {
+ state->idev = NULL;
+ goto out;
+ }
+ state->idev = __in6_dev_get(state->dev);
+ if (!state->idev)
+ continue;
+ read_lock_bh(&state->idev->lock);
+ state->im = state->idev->mc_list;
+ }
+ if (!state->im)
+ break;
+ spin_lock_bh(&state->im->mca_lock);
+ psf = state->im->mca_sources;
+ }
+out:
+ return psf;
+}
+
+static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
+{
+ struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
+ if (psf)
+ while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
+ --pos;
+ return pos ? NULL : psf;
+}
+
+static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(RCU)
+{
+ rcu_read_lock();
+ return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct ip6_sf_list *psf;
+ if (v == SEQ_START_TOKEN)
+ psf = igmp6_mcf_get_first(seq);
+ else
+ psf = igmp6_mcf_get_next(seq, v);
+ ++*pos;
+ return psf;
+}
+
+static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
+ __releases(RCU)
+{
+ struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
+ if (likely(state->im)) {
+ spin_unlock_bh(&state->im->mca_lock);
+ state->im = NULL;
+ }
+ if (likely(state->idev)) {
+ read_unlock_bh(&state->idev->lock);
+ state->idev = NULL;
+ }
+ state->dev = NULL;
+ rcu_read_unlock();
+}
+
+static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
+{
+ struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
+ struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
+ } else {
+ seq_printf(seq,
+ "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
+ state->dev->ifindex, state->dev->name,
+ &state->im->mca_addr,
+ &psf->sf_addr,
+ psf->sf_count[MCAST_INCLUDE],
+ psf->sf_count[MCAST_EXCLUDE]);
+ }
+ return 0;
+}
+
+static const struct seq_operations igmp6_mcf_seq_ops = {
+ .start = igmp6_mcf_seq_start,
+ .next = igmp6_mcf_seq_next,
+ .stop = igmp6_mcf_seq_stop,
+ .show = igmp6_mcf_seq_show,
+};
+
+static int __net_init igmp6_proc_init(struct net *net)
+{
+ int err;
+
+ err = -ENOMEM;
+ if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
+ sizeof(struct igmp6_mc_iter_state)))
+ goto out;
+ if (!proc_create_net("mcfilter6", 0444, net->proc_net,
+ &igmp6_mcf_seq_ops,
+ sizeof(struct igmp6_mcf_iter_state)))
+ goto out_proc_net_igmp6;
+
+ err = 0;
+out:
+ return err;
+
+out_proc_net_igmp6:
+ remove_proc_entry("igmp6", net->proc_net);
+ goto out;
+}
+
+static void __net_exit igmp6_proc_exit(struct net *net)
+{
+ remove_proc_entry("mcfilter6", net->proc_net);
+ remove_proc_entry("igmp6", net->proc_net);
+}
+#else
+static inline int igmp6_proc_init(struct net *net)
+{
+ return 0;
+}
+static inline void igmp6_proc_exit(struct net *net)
+{
+}
+#endif
+
+static int __net_init igmp6_net_init(struct net *net)
+{
+ int err;
+
+ err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
+ SOCK_RAW, IPPROTO_ICMPV6, net);
+ if (err < 0) {
+ pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
+ err);
+ goto out;
+ }
+
+ inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
+
+ err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
+ SOCK_RAW, IPPROTO_ICMPV6, net);
+ if (err < 0) {
+ pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
+ err);
+ goto out_sock_create;
+ }
+
+ err = igmp6_proc_init(net);
+ if (err)
+ goto out_sock_create_autojoin;
+
+ return 0;
+
+out_sock_create_autojoin:
+ inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
+out_sock_create:
+ inet_ctl_sock_destroy(net->ipv6.igmp_sk);
+out:
+ return err;
+}
+
+static void __net_exit igmp6_net_exit(struct net *net)
+{
+ inet_ctl_sock_destroy(net->ipv6.igmp_sk);
+ inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
+ igmp6_proc_exit(net);
+}
+
+static struct pernet_operations igmp6_net_ops = {
+ .init = igmp6_net_init,
+ .exit = igmp6_net_exit,
+};
+
+int __init igmp6_init(void)
+{
+ return register_pernet_subsys(&igmp6_net_ops);
+}
+
+int __init igmp6_late_init(void)
+{
+ return register_netdevice_notifier(&igmp6_netdev_notifier);
+}
+
+void igmp6_cleanup(void)
+{
+ unregister_pernet_subsys(&igmp6_net_ops);
+}
+
+void igmp6_late_cleanup(void)
+{
+ unregister_netdevice_notifier(&igmp6_netdev_notifier);
+}
diff --git a/net/ipv6/mcast_snoop.c b/net/ipv6/mcast_snoop.c
new file mode 100644
index 0000000..9405b04
--- /dev/null
+++ b/net/ipv6/mcast_snoop.c
@@ -0,0 +1,216 @@
+/* Copyright (C) 2010: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
+ * Copyright (C) 2015: Linus Lüssing <linus.luessing@c0d3.blue>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Based on the MLD support added to br_multicast.c by YOSHIFUJI Hideaki.
+ */
+
+#include <linux/skbuff.h>
+#include <net/ipv6.h>
+#include <net/mld.h>
+#include <net/addrconf.h>
+#include <net/ip6_checksum.h>
+
+static int ipv6_mc_check_ip6hdr(struct sk_buff *skb)
+{
+ const struct ipv6hdr *ip6h;
+ unsigned int len;
+ unsigned int offset = skb_network_offset(skb) + sizeof(*ip6h);
+
+ if (!pskb_may_pull(skb, offset))
+ return -EINVAL;
+
+ ip6h = ipv6_hdr(skb);
+
+ if (ip6h->version != 6)
+ return -EINVAL;
+
+ len = offset + ntohs(ip6h->payload_len);
+ if (skb->len < len || len <= offset)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int ipv6_mc_check_exthdrs(struct sk_buff *skb)
+{
+ const struct ipv6hdr *ip6h;
+ int offset;
+ u8 nexthdr;
+ __be16 frag_off;
+
+ ip6h = ipv6_hdr(skb);
+
+ if (ip6h->nexthdr != IPPROTO_HOPOPTS)
+ return -ENOMSG;
+
+ nexthdr = ip6h->nexthdr;
+ offset = skb_network_offset(skb) + sizeof(*ip6h);
+ offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
+
+ if (offset < 0)
+ return -EINVAL;
+
+ if (nexthdr != IPPROTO_ICMPV6)
+ return -ENOMSG;
+
+ skb_set_transport_header(skb, offset);
+
+ return 0;
+}
+
+static int ipv6_mc_check_mld_reportv2(struct sk_buff *skb)
+{
+ unsigned int len = skb_transport_offset(skb);
+
+ len += sizeof(struct mld2_report);
+
+ return pskb_may_pull(skb, len) ? 0 : -EINVAL;
+}
+
+static int ipv6_mc_check_mld_query(struct sk_buff *skb)
+{
+ struct mld_msg *mld;
+ unsigned int len = skb_transport_offset(skb);
+
+ /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
+ if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
+ return -EINVAL;
+
+ len += sizeof(struct mld_msg);
+ if (skb->len < len)
+ return -EINVAL;
+
+ /* MLDv1? */
+ if (skb->len != len) {
+ /* or MLDv2? */
+ len += sizeof(struct mld2_query) - sizeof(struct mld_msg);
+ if (skb->len < len || !pskb_may_pull(skb, len))
+ return -EINVAL;
+ }
+
+ mld = (struct mld_msg *)skb_transport_header(skb);
+
+ /* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
+ * all-nodes destination address (ff02::1) for general queries
+ */
+ if (ipv6_addr_any(&mld->mld_mca) &&
+ !ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int ipv6_mc_check_mld_msg(struct sk_buff *skb)
+{
+ struct mld_msg *mld = (struct mld_msg *)skb_transport_header(skb);
+
+ switch (mld->mld_type) {
+ case ICMPV6_MGM_REDUCTION:
+ case ICMPV6_MGM_REPORT:
+ /* fall through */
+ return 0;
+ case ICMPV6_MLD2_REPORT:
+ return ipv6_mc_check_mld_reportv2(skb);
+ case ICMPV6_MGM_QUERY:
+ return ipv6_mc_check_mld_query(skb);
+ default:
+ return -ENOMSG;
+ }
+}
+
+static inline __sum16 ipv6_mc_validate_checksum(struct sk_buff *skb)
+{
+ return skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo);
+}
+
+static int __ipv6_mc_check_mld(struct sk_buff *skb,
+ struct sk_buff **skb_trimmed)
+
+{
+ struct sk_buff *skb_chk = NULL;
+ unsigned int transport_len;
+ unsigned int len = skb_transport_offset(skb) + sizeof(struct mld_msg);
+ int ret = -EINVAL;
+
+ transport_len = ntohs(ipv6_hdr(skb)->payload_len);
+ transport_len -= skb_transport_offset(skb) - sizeof(struct ipv6hdr);
+
+ skb_chk = skb_checksum_trimmed(skb, transport_len,
+ ipv6_mc_validate_checksum);
+ if (!skb_chk)
+ goto err;
+
+ if (!pskb_may_pull(skb_chk, len))
+ goto err;
+
+ ret = ipv6_mc_check_mld_msg(skb_chk);
+ if (ret)
+ goto err;
+
+ if (skb_trimmed)
+ *skb_trimmed = skb_chk;
+ /* free now unneeded clone */
+ else if (skb_chk != skb)
+ kfree_skb(skb_chk);
+
+ ret = 0;
+
+err:
+ if (ret && skb_chk && skb_chk != skb)
+ kfree_skb(skb_chk);
+
+ return ret;
+}
+
+/**
+ * ipv6_mc_check_mld - checks whether this is a sane MLD packet
+ * @skb: the skb to validate
+ * @skb_trimmed: to store an skb pointer trimmed to IPv6 packet tail (optional)
+ *
+ * Checks whether an IPv6 packet is a valid MLD packet. If so sets
+ * skb transport header accordingly and returns zero.
+ *
+ * -EINVAL: A broken packet was detected, i.e. it violates some internet
+ * standard
+ * -ENOMSG: IP header validation succeeded but it is not an MLD packet.
+ * -ENOMEM: A memory allocation failure happened.
+ *
+ * Optionally, an skb pointer might be provided via skb_trimmed (or set it
+ * to NULL): After parsing an MLD packet successfully it will point to
+ * an skb which has its tail aligned to the IP packet end. This might
+ * either be the originally provided skb or a trimmed, cloned version if
+ * the skb frame had data beyond the IP packet. A cloned skb allows us
+ * to leave the original skb and its full frame unchanged (which might be
+ * desirable for layer 2 frame jugglers).
+ *
+ * Caller needs to set the skb network header and free any returned skb if it
+ * differs from the provided skb.
+ */
+int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed)
+{
+ int ret;
+
+ ret = ipv6_mc_check_ip6hdr(skb);
+ if (ret < 0)
+ return ret;
+
+ ret = ipv6_mc_check_exthdrs(skb);
+ if (ret < 0)
+ return ret;
+
+ return __ipv6_mc_check_mld(skb, skb_trimmed);
+}
+EXPORT_SYMBOL(ipv6_mc_check_mld);
diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c
new file mode 100644
index 0000000..64f0f7b
--- /dev/null
+++ b/net/ipv6/mip6.c
@@ -0,0 +1,525 @@
+/*
+ * Copyright (C)2003-2006 Helsinki University of Technology
+ * Copyright (C)2003-2006 USAGI/WIDE Project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Authors:
+ * Noriaki TAKAMIYA @USAGI
+ * Masahide NAKAMURA @USAGI
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/time.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <net/sock.h>
+#include <net/ipv6.h>
+#include <net/ip6_checksum.h>
+#include <net/rawv6.h>
+#include <net/xfrm.h>
+#include <net/mip6.h>
+
+static inline unsigned int calc_padlen(unsigned int len, unsigned int n)
+{
+ return (n - len + 16) & 0x7;
+}
+
+static inline void *mip6_padn(__u8 *data, __u8 padlen)
+{
+ if (!data)
+ return NULL;
+ if (padlen == 1) {
+ data[0] = IPV6_TLV_PAD1;
+ } else if (padlen > 1) {
+ data[0] = IPV6_TLV_PADN;
+ data[1] = padlen - 2;
+ if (padlen > 2)
+ memset(data+2, 0, data[1]);
+ }
+ return data + padlen;
+}
+
+static inline void mip6_param_prob(struct sk_buff *skb, u8 code, int pos)
+{
+ icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos);
+}
+
+static int mip6_mh_len(int type)
+{
+ int len = 0;
+
+ switch (type) {
+ case IP6_MH_TYPE_BRR:
+ len = 0;
+ break;
+ case IP6_MH_TYPE_HOTI:
+ case IP6_MH_TYPE_COTI:
+ case IP6_MH_TYPE_BU:
+ case IP6_MH_TYPE_BACK:
+ len = 1;
+ break;
+ case IP6_MH_TYPE_HOT:
+ case IP6_MH_TYPE_COT:
+ case IP6_MH_TYPE_BERROR:
+ len = 2;
+ break;
+ }
+ return len;
+}
+
+static int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
+{
+ struct ip6_mh _hdr;
+ const struct ip6_mh *mh;
+
+ mh = skb_header_pointer(skb, skb_transport_offset(skb),
+ sizeof(_hdr), &_hdr);
+ if (!mh)
+ return -1;
+
+ if (((mh->ip6mh_hdrlen + 1) << 3) > skb->len)
+ return -1;
+
+ if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) {
+ net_dbg_ratelimited("mip6: MH message too short: %d vs >=%d\n",
+ mh->ip6mh_hdrlen,
+ mip6_mh_len(mh->ip6mh_type));
+ mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_hdrlen) +
+ skb_network_header_len(skb));
+ return -1;
+ }
+
+ if (mh->ip6mh_proto != IPPROTO_NONE) {
+ net_dbg_ratelimited("mip6: MH invalid payload proto = %d\n",
+ mh->ip6mh_proto);
+ mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_proto) +
+ skb_network_header_len(skb));
+ return -1;
+ }
+
+ return 0;
+}
+
+struct mip6_report_rate_limiter {
+ spinlock_t lock;
+ ktime_t stamp;
+ int iif;
+ struct in6_addr src;
+ struct in6_addr dst;
+};
+
+static struct mip6_report_rate_limiter mip6_report_rl = {
+ .lock = __SPIN_LOCK_UNLOCKED(mip6_report_rl.lock)
+};
+
+static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data;
+ int err = destopt->nexthdr;
+
+ spin_lock(&x->lock);
+ if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) &&
+ !ipv6_addr_any((struct in6_addr *)x->coaddr))
+ err = -ENOENT;
+ spin_unlock(&x->lock);
+
+ return err;
+}
+
+/* Destination Option Header is inserted.
+ * IP Header's src address is replaced with Home Address Option in
+ * Destination Option Header.
+ */
+static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ipv6hdr *iph;
+ struct ipv6_destopt_hdr *dstopt;
+ struct ipv6_destopt_hao *hao;
+ u8 nexthdr;
+ int len;
+
+ skb_push(skb, -skb_network_offset(skb));
+ iph = ipv6_hdr(skb);
+
+ nexthdr = *skb_mac_header(skb);
+ *skb_mac_header(skb) = IPPROTO_DSTOPTS;
+
+ dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb);
+ dstopt->nexthdr = nexthdr;
+
+ hao = mip6_padn((char *)(dstopt + 1),
+ calc_padlen(sizeof(*dstopt), 6));
+
+ hao->type = IPV6_TLV_HAO;
+ BUILD_BUG_ON(sizeof(*hao) != 18);
+ hao->length = sizeof(*hao) - 2;
+
+ len = ((char *)hao - (char *)dstopt) + sizeof(*hao);
+
+ memcpy(&hao->addr, &iph->saddr, sizeof(hao->addr));
+ spin_lock_bh(&x->lock);
+ memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr));
+ spin_unlock_bh(&x->lock);
+
+ WARN_ON(len != x->props.header_len);
+ dstopt->hdrlen = (x->props.header_len >> 3) - 1;
+
+ return 0;
+}
+
+static inline int mip6_report_rl_allow(ktime_t stamp,
+ const struct in6_addr *dst,
+ const struct in6_addr *src, int iif)
+{
+ int allow = 0;
+
+ spin_lock_bh(&mip6_report_rl.lock);
+ if (mip6_report_rl.stamp != stamp ||
+ mip6_report_rl.iif != iif ||
+ !ipv6_addr_equal(&mip6_report_rl.src, src) ||
+ !ipv6_addr_equal(&mip6_report_rl.dst, dst)) {
+ mip6_report_rl.stamp = stamp;
+ mip6_report_rl.iif = iif;
+ mip6_report_rl.src = *src;
+ mip6_report_rl.dst = *dst;
+ allow = 1;
+ }
+ spin_unlock_bh(&mip6_report_rl.lock);
+ return allow;
+}
+
+static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb,
+ const struct flowi *fl)
+{
+ struct net *net = xs_net(x);
+ struct inet6_skb_parm *opt = (struct inet6_skb_parm *)skb->cb;
+ const struct flowi6 *fl6 = &fl->u.ip6;
+ struct ipv6_destopt_hao *hao = NULL;
+ struct xfrm_selector sel;
+ int offset;
+ ktime_t stamp;
+ int err = 0;
+
+ if (unlikely(fl6->flowi6_proto == IPPROTO_MH &&
+ fl6->fl6_mh_type <= IP6_MH_TYPE_MAX))
+ goto out;
+
+ if (likely(opt->dsthao)) {
+ offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
+ if (likely(offset >= 0))
+ hao = (struct ipv6_destopt_hao *)
+ (skb_network_header(skb) + offset);
+ }
+
+ stamp = skb_get_ktime(skb);
+
+ if (!mip6_report_rl_allow(stamp, &ipv6_hdr(skb)->daddr,
+ hao ? &hao->addr : &ipv6_hdr(skb)->saddr,
+ opt->iif))
+ goto out;
+
+ memset(&sel, 0, sizeof(sel));
+ memcpy(&sel.daddr, (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
+ sizeof(sel.daddr));
+ sel.prefixlen_d = 128;
+ memcpy(&sel.saddr, (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
+ sizeof(sel.saddr));
+ sel.prefixlen_s = 128;
+ sel.family = AF_INET6;
+ sel.proto = fl6->flowi6_proto;
+ sel.dport = xfrm_flowi_dport(fl, &fl6->uli);
+ if (sel.dport)
+ sel.dport_mask = htons(~0);
+ sel.sport = xfrm_flowi_sport(fl, &fl6->uli);
+ if (sel.sport)
+ sel.sport_mask = htons(~0);
+ sel.ifindex = fl6->flowi6_oif;
+
+ err = km_report(net, IPPROTO_DSTOPTS, &sel,
+ (hao ? (xfrm_address_t *)&hao->addr : NULL));
+
+ out:
+ return err;
+}
+
+static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb,
+ u8 **nexthdr)
+{
+ u16 offset = sizeof(struct ipv6hdr);
+ struct ipv6_opt_hdr *exthdr =
+ (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
+ const unsigned char *nh = skb_network_header(skb);
+ unsigned int packet_len = skb_tail_pointer(skb) -
+ skb_network_header(skb);
+ int found_rhdr = 0;
+
+ *nexthdr = &ipv6_hdr(skb)->nexthdr;
+
+ while (offset + 1 <= packet_len) {
+
+ switch (**nexthdr) {
+ case NEXTHDR_HOP:
+ break;
+ case NEXTHDR_ROUTING:
+ found_rhdr = 1;
+ break;
+ case NEXTHDR_DEST:
+ /*
+ * HAO MUST NOT appear more than once.
+ * XXX: It is better to try to find by the end of
+ * XXX: packet if HAO exists.
+ */
+ if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
+ net_dbg_ratelimited("mip6: hao exists already, override\n");
+ return offset;
+ }
+
+ if (found_rhdr)
+ return offset;
+
+ break;
+ default:
+ return offset;
+ }
+
+ offset += ipv6_optlen(exthdr);
+ *nexthdr = &exthdr->nexthdr;
+ exthdr = (struct ipv6_opt_hdr *)(nh + offset);
+ }
+
+ return offset;
+}
+
+static int mip6_destopt_init_state(struct xfrm_state *x)
+{
+ if (x->id.spi) {
+ pr_info("%s: spi is not 0: %u\n", __func__, x->id.spi);
+ return -EINVAL;
+ }
+ if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
+ pr_info("%s: state's mode is not %u: %u\n",
+ __func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
+ return -EINVAL;
+ }
+
+ x->props.header_len = sizeof(struct ipv6_destopt_hdr) +
+ calc_padlen(sizeof(struct ipv6_destopt_hdr), 6) +
+ sizeof(struct ipv6_destopt_hao);
+ WARN_ON(x->props.header_len != 24);
+
+ return 0;
+}
+
+/*
+ * Do nothing about destroying since it has no specific operation for
+ * destination options header unlike IPsec protocols.
+ */
+static void mip6_destopt_destroy(struct xfrm_state *x)
+{
+}
+
+static const struct xfrm_type mip6_destopt_type = {
+ .description = "MIP6DESTOPT",
+ .owner = THIS_MODULE,
+ .proto = IPPROTO_DSTOPTS,
+ .flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_LOCAL_COADDR,
+ .init_state = mip6_destopt_init_state,
+ .destructor = mip6_destopt_destroy,
+ .input = mip6_destopt_input,
+ .output = mip6_destopt_output,
+ .reject = mip6_destopt_reject,
+ .hdr_offset = mip6_destopt_offset,
+};
+
+static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct rt2_hdr *rt2 = (struct rt2_hdr *)skb->data;
+ int err = rt2->rt_hdr.nexthdr;
+
+ spin_lock(&x->lock);
+ if (!ipv6_addr_equal(&iph->daddr, (struct in6_addr *)x->coaddr) &&
+ !ipv6_addr_any((struct in6_addr *)x->coaddr))
+ err = -ENOENT;
+ spin_unlock(&x->lock);
+
+ return err;
+}
+
+/* Routing Header type 2 is inserted.
+ * IP Header's dst address is replaced with Routing Header's Home Address.
+ */
+static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ipv6hdr *iph;
+ struct rt2_hdr *rt2;
+ u8 nexthdr;
+
+ skb_push(skb, -skb_network_offset(skb));
+ iph = ipv6_hdr(skb);
+
+ nexthdr = *skb_mac_header(skb);
+ *skb_mac_header(skb) = IPPROTO_ROUTING;
+
+ rt2 = (struct rt2_hdr *)skb_transport_header(skb);
+ rt2->rt_hdr.nexthdr = nexthdr;
+ rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
+ rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
+ rt2->rt_hdr.segments_left = 1;
+ memset(&rt2->reserved, 0, sizeof(rt2->reserved));
+
+ WARN_ON(rt2->rt_hdr.hdrlen != 2);
+
+ memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr));
+ spin_lock_bh(&x->lock);
+ memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr));
+ spin_unlock_bh(&x->lock);
+
+ return 0;
+}
+
+static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
+ u8 **nexthdr)
+{
+ u16 offset = sizeof(struct ipv6hdr);
+ struct ipv6_opt_hdr *exthdr =
+ (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
+ const unsigned char *nh = skb_network_header(skb);
+ unsigned int packet_len = skb_tail_pointer(skb) -
+ skb_network_header(skb);
+ int found_rhdr = 0;
+
+ *nexthdr = &ipv6_hdr(skb)->nexthdr;
+
+ while (offset + 1 <= packet_len) {
+
+ switch (**nexthdr) {
+ case NEXTHDR_HOP:
+ break;
+ case NEXTHDR_ROUTING:
+ if (offset + 3 <= packet_len) {
+ struct ipv6_rt_hdr *rt;
+ rt = (struct ipv6_rt_hdr *)(nh + offset);
+ if (rt->type != 0)
+ return offset;
+ }
+ found_rhdr = 1;
+ break;
+ case NEXTHDR_DEST:
+ if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
+ return offset;
+
+ if (found_rhdr)
+ return offset;
+
+ break;
+ default:
+ return offset;
+ }
+
+ offset += ipv6_optlen(exthdr);
+ *nexthdr = &exthdr->nexthdr;
+ exthdr = (struct ipv6_opt_hdr *)(nh + offset);
+ }
+
+ return offset;
+}
+
+static int mip6_rthdr_init_state(struct xfrm_state *x)
+{
+ if (x->id.spi) {
+ pr_info("%s: spi is not 0: %u\n", __func__, x->id.spi);
+ return -EINVAL;
+ }
+ if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
+ pr_info("%s: state's mode is not %u: %u\n",
+ __func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
+ return -EINVAL;
+ }
+
+ x->props.header_len = sizeof(struct rt2_hdr);
+
+ return 0;
+}
+
+/*
+ * Do nothing about destroying since it has no specific operation for routing
+ * header type 2 unlike IPsec protocols.
+ */
+static void mip6_rthdr_destroy(struct xfrm_state *x)
+{
+}
+
+static const struct xfrm_type mip6_rthdr_type = {
+ .description = "MIP6RT",
+ .owner = THIS_MODULE,
+ .proto = IPPROTO_ROUTING,
+ .flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_REMOTE_COADDR,
+ .init_state = mip6_rthdr_init_state,
+ .destructor = mip6_rthdr_destroy,
+ .input = mip6_rthdr_input,
+ .output = mip6_rthdr_output,
+ .hdr_offset = mip6_rthdr_offset,
+};
+
+static int __init mip6_init(void)
+{
+ pr_info("Mobile IPv6\n");
+
+ if (xfrm_register_type(&mip6_destopt_type, AF_INET6) < 0) {
+ pr_info("%s: can't add xfrm type(destopt)\n", __func__);
+ goto mip6_destopt_xfrm_fail;
+ }
+ if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) {
+ pr_info("%s: can't add xfrm type(rthdr)\n", __func__);
+ goto mip6_rthdr_xfrm_fail;
+ }
+ if (rawv6_mh_filter_register(mip6_mh_filter) < 0) {
+ pr_info("%s: can't add rawv6 mh filter\n", __func__);
+ goto mip6_rawv6_mh_fail;
+ }
+
+
+ return 0;
+
+ mip6_rawv6_mh_fail:
+ xfrm_unregister_type(&mip6_rthdr_type, AF_INET6);
+ mip6_rthdr_xfrm_fail:
+ xfrm_unregister_type(&mip6_destopt_type, AF_INET6);
+ mip6_destopt_xfrm_fail:
+ return -EAGAIN;
+}
+
+static void __exit mip6_fini(void)
+{
+ if (rawv6_mh_filter_unregister(mip6_mh_filter) < 0)
+ pr_info("%s: can't remove rawv6 mh filter\n", __func__);
+ if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0)
+ pr_info("%s: can't remove xfrm type(rthdr)\n", __func__);
+ if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0)
+ pr_info("%s: can't remove xfrm type(destopt)\n", __func__);
+}
+
+module_init(mip6_init);
+module_exit(mip6_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_DSTOPTS);
+MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ROUTING);
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
new file mode 100644
index 0000000..673a4a9
--- /dev/null
+++ b/net/ipv6/ndisc.c
@@ -0,0 +1,1940 @@
+/*
+ * Neighbour Discovery for IPv6
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ * Mike Shaver <shaver@ingenia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * Changes:
+ *
+ * Alexey I. Froloff : RFC6106 (DNSSL) support
+ * Pierre Ynard : export userland ND options
+ * through netlink (RDNSS support)
+ * Lars Fenneberg : fixed MTU setting on receipt
+ * of an RA.
+ * Janos Farkas : kmalloc failure checks
+ * Alexey Kuznetsov : state machine reworked
+ * and moved to net/core.
+ * Pekka Savola : RFC2461 validation
+ * YOSHIFUJI Hideaki @USAGI : Verify ND options properly
+ */
+
+#define pr_fmt(fmt) "ICMPv6: " fmt
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/sched.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/route.h>
+#include <linux/init.h>
+#include <linux/rcupdate.h>
+#include <linux/slab.h>
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+
+#include <linux/if_addr.h>
+#include <linux/if_ether.h>
+#include <linux/if_arp.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/jhash.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/ndisc.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/icmp.h>
+
+#include <net/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <net/flow.h>
+#include <net/ip6_checksum.h>
+#include <net/inet_common.h>
+#include <linux/proc_fs.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+
+static u32 ndisc_hash(const void *pkey,
+ const struct net_device *dev,
+ __u32 *hash_rnd);
+static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey);
+static int ndisc_constructor(struct neighbour *neigh);
+static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
+static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
+static int pndisc_constructor(struct pneigh_entry *n);
+static void pndisc_destructor(struct pneigh_entry *n);
+static void pndisc_redo(struct sk_buff *skb);
+
+static const struct neigh_ops ndisc_generic_ops = {
+ .family = AF_INET6,
+ .solicit = ndisc_solicit,
+ .error_report = ndisc_error_report,
+ .output = neigh_resolve_output,
+ .connected_output = neigh_connected_output,
+};
+
+static const struct neigh_ops ndisc_hh_ops = {
+ .family = AF_INET6,
+ .solicit = ndisc_solicit,
+ .error_report = ndisc_error_report,
+ .output = neigh_resolve_output,
+ .connected_output = neigh_resolve_output,
+};
+
+
+static const struct neigh_ops ndisc_direct_ops = {
+ .family = AF_INET6,
+ .output = neigh_direct_output,
+ .connected_output = neigh_direct_output,
+};
+
+struct neigh_table nd_tbl = {
+ .family = AF_INET6,
+ .key_len = sizeof(struct in6_addr),
+ .protocol = cpu_to_be16(ETH_P_IPV6),
+ .hash = ndisc_hash,
+ .key_eq = ndisc_key_eq,
+ .constructor = ndisc_constructor,
+ .pconstructor = pndisc_constructor,
+ .pdestructor = pndisc_destructor,
+ .proxy_redo = pndisc_redo,
+ .id = "ndisc_cache",
+ .parms = {
+ .tbl = &nd_tbl,
+ .reachable_time = ND_REACHABLE_TIME,
+ .data = {
+ [NEIGH_VAR_MCAST_PROBES] = 3,
+ [NEIGH_VAR_UCAST_PROBES] = 3,
+ [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER,
+ [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME,
+ [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
+ [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
+ [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX,
+ [NEIGH_VAR_PROXY_QLEN] = 64,
+ [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ,
+ [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10,
+ },
+ },
+ .gc_interval = 30 * HZ,
+ .gc_thresh1 = 128,
+ .gc_thresh2 = 512,
+ .gc_thresh3 = 1024,
+};
+EXPORT_SYMBOL_GPL(nd_tbl);
+
+void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
+ int data_len, int pad)
+{
+ int space = __ndisc_opt_addr_space(data_len, pad);
+ u8 *opt = skb_put(skb, space);
+
+ opt[0] = type;
+ opt[1] = space>>3;
+
+ memset(opt + 2, 0, pad);
+ opt += pad;
+ space -= pad;
+
+ memcpy(opt+2, data, data_len);
+ data_len += 2;
+ opt += data_len;
+ space -= data_len;
+ if (space > 0)
+ memset(opt, 0, space);
+}
+EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option);
+
+static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type,
+ void *data, u8 icmp6_type)
+{
+ __ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len,
+ ndisc_addr_option_pad(skb->dev->type));
+ ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type);
+}
+
+static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb,
+ void *ha,
+ const u8 *ops_data)
+{
+ ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT);
+ ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data);
+}
+
+static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
+ struct nd_opt_hdr *end)
+{
+ int type;
+ if (!cur || !end || cur >= end)
+ return NULL;
+ type = cur->nd_opt_type;
+ do {
+ cur = ((void *)cur) + (cur->nd_opt_len << 3);
+ } while (cur < end && cur->nd_opt_type != type);
+ return cur <= end && cur->nd_opt_type == type ? cur : NULL;
+}
+
+static inline int ndisc_is_useropt(const struct net_device *dev,
+ struct nd_opt_hdr *opt)
+{
+ return opt->nd_opt_type == ND_OPT_RDNSS ||
+ opt->nd_opt_type == ND_OPT_DNSSL ||
+ ndisc_ops_is_useropt(dev, opt->nd_opt_type);
+}
+
+static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev,
+ struct nd_opt_hdr *cur,
+ struct nd_opt_hdr *end)
+{
+ if (!cur || !end || cur >= end)
+ return NULL;
+ do {
+ cur = ((void *)cur) + (cur->nd_opt_len << 3);
+ } while (cur < end && !ndisc_is_useropt(dev, cur));
+ return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL;
+}
+
+struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
+ u8 *opt, int opt_len,
+ struct ndisc_options *ndopts)
+{
+ struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
+
+ if (!nd_opt || opt_len < 0 || !ndopts)
+ return NULL;
+ memset(ndopts, 0, sizeof(*ndopts));
+ while (opt_len) {
+ int l;
+ if (opt_len < sizeof(struct nd_opt_hdr))
+ return NULL;
+ l = nd_opt->nd_opt_len << 3;
+ if (opt_len < l || l == 0)
+ return NULL;
+ if (ndisc_ops_parse_options(dev, nd_opt, ndopts))
+ goto next_opt;
+ switch (nd_opt->nd_opt_type) {
+ case ND_OPT_SOURCE_LL_ADDR:
+ case ND_OPT_TARGET_LL_ADDR:
+ case ND_OPT_MTU:
+ case ND_OPT_NONCE:
+ case ND_OPT_REDIRECT_HDR:
+ if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
+ ND_PRINTK(2, warn,
+ "%s: duplicated ND6 option found: type=%d\n",
+ __func__, nd_opt->nd_opt_type);
+ } else {
+ ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
+ }
+ break;
+ case ND_OPT_PREFIX_INFO:
+ ndopts->nd_opts_pi_end = nd_opt;
+ if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
+ ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
+ break;
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ case ND_OPT_ROUTE_INFO:
+ ndopts->nd_opts_ri_end = nd_opt;
+ if (!ndopts->nd_opts_ri)
+ ndopts->nd_opts_ri = nd_opt;
+ break;
+#endif
+ default:
+ if (ndisc_is_useropt(dev, nd_opt)) {
+ ndopts->nd_useropts_end = nd_opt;
+ if (!ndopts->nd_useropts)
+ ndopts->nd_useropts = nd_opt;
+ } else {
+ /*
+ * Unknown options must be silently ignored,
+ * to accommodate future extension to the
+ * protocol.
+ */
+ ND_PRINTK(2, notice,
+ "%s: ignored unsupported option; type=%d, len=%d\n",
+ __func__,
+ nd_opt->nd_opt_type,
+ nd_opt->nd_opt_len);
+ }
+ }
+next_opt:
+ opt_len -= l;
+ nd_opt = ((void *)nd_opt) + l;
+ }
+ return ndopts;
+}
+
+int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
+{
+ switch (dev->type) {
+ case ARPHRD_ETHER:
+ case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
+ case ARPHRD_FDDI:
+ ipv6_eth_mc_map(addr, buf);
+ return 0;
+ case ARPHRD_ARCNET:
+ ipv6_arcnet_mc_map(addr, buf);
+ return 0;
+ case ARPHRD_INFINIBAND:
+ ipv6_ib_mc_map(addr, dev->broadcast, buf);
+ return 0;
+ case ARPHRD_IPGRE:
+ return ipv6_ipgre_mc_map(addr, dev->broadcast, buf);
+ default:
+ if (dir) {
+ memcpy(buf, dev->broadcast, dev->addr_len);
+ return 0;
+ }
+ }
+ return -EINVAL;
+}
+EXPORT_SYMBOL(ndisc_mc_map);
+
+static u32 ndisc_hash(const void *pkey,
+ const struct net_device *dev,
+ __u32 *hash_rnd)
+{
+ return ndisc_hashfn(pkey, dev, hash_rnd);
+}
+
+static bool ndisc_key_eq(const struct neighbour *n, const void *pkey)
+{
+ return neigh_key_eq128(n, pkey);
+}
+
+static int ndisc_constructor(struct neighbour *neigh)
+{
+ struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key;
+ struct net_device *dev = neigh->dev;
+ struct inet6_dev *in6_dev;
+ struct neigh_parms *parms;
+ bool is_multicast = ipv6_addr_is_multicast(addr);
+
+ in6_dev = in6_dev_get(dev);
+ if (!in6_dev) {
+ return -EINVAL;
+ }
+
+ parms = in6_dev->nd_parms;
+ __neigh_parms_put(neigh->parms);
+ neigh->parms = neigh_parms_clone(parms);
+
+ neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
+ if (!dev->header_ops) {
+ neigh->nud_state = NUD_NOARP;
+ neigh->ops = &ndisc_direct_ops;
+ neigh->output = neigh_direct_output;
+ } else {
+ if (is_multicast) {
+ neigh->nud_state = NUD_NOARP;
+ ndisc_mc_map(addr, neigh->ha, dev, 1);
+ } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
+ neigh->nud_state = NUD_NOARP;
+ memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
+ if (dev->flags&IFF_LOOPBACK)
+ neigh->type = RTN_LOCAL;
+ } else if (dev->flags&IFF_POINTOPOINT) {
+ neigh->nud_state = NUD_NOARP;
+ memcpy(neigh->ha, dev->broadcast, dev->addr_len);
+ }
+ if (dev->header_ops->cache)
+ neigh->ops = &ndisc_hh_ops;
+ else
+ neigh->ops = &ndisc_generic_ops;
+ if (neigh->nud_state&NUD_VALID)
+ neigh->output = neigh->ops->connected_output;
+ else
+ neigh->output = neigh->ops->output;
+ }
+ in6_dev_put(in6_dev);
+ return 0;
+}
+
+static int pndisc_constructor(struct pneigh_entry *n)
+{
+ struct in6_addr *addr = (struct in6_addr *)&n->key;
+ struct in6_addr maddr;
+ struct net_device *dev = n->dev;
+
+ if (!dev || !__in6_dev_get(dev))
+ return -EINVAL;
+ addrconf_addr_solict_mult(addr, &maddr);
+ ipv6_dev_mc_inc(dev, &maddr);
+ return 0;
+}
+
+static void pndisc_destructor(struct pneigh_entry *n)
+{
+ struct in6_addr *addr = (struct in6_addr *)&n->key;
+ struct in6_addr maddr;
+ struct net_device *dev = n->dev;
+
+ if (!dev || !__in6_dev_get(dev))
+ return;
+ addrconf_addr_solict_mult(addr, &maddr);
+ ipv6_dev_mc_dec(dev, &maddr);
+}
+
+static struct sk_buff *ndisc_alloc_skb(struct net_device *dev,
+ int len)
+{
+ int hlen = LL_RESERVED_SPACE(dev);
+ int tlen = dev->needed_tailroom;
+ struct sock *sk = dev_net(dev)->ipv6.ndisc_sk;
+ struct sk_buff *skb;
+
+ skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC);
+ if (!skb) {
+ ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n",
+ __func__);
+ return NULL;
+ }
+
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->dev = dev;
+
+ skb_reserve(skb, hlen + sizeof(struct ipv6hdr));
+ skb_reset_transport_header(skb);
+
+ /* Manually assign socket ownership as we avoid calling
+ * sock_alloc_send_pskb() to bypass wmem buffer limits
+ */
+ skb_set_owner_w(skb, sk);
+
+ return skb;
+}
+
+static void ip6_nd_hdr(struct sk_buff *skb,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ int hop_limit, int len)
+{
+ struct ipv6hdr *hdr;
+ struct inet6_dev *idev;
+ unsigned tclass;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(skb->dev);
+ tclass = idev ? idev->cnf.ndisc_tclass : 0;
+ rcu_read_unlock();
+
+ skb_push(skb, sizeof(*hdr));
+ skb_reset_network_header(skb);
+ hdr = ipv6_hdr(skb);
+
+ ip6_flow_hdr(hdr, tclass, 0);
+
+ hdr->payload_len = htons(len);
+ hdr->nexthdr = IPPROTO_ICMPV6;
+ hdr->hop_limit = hop_limit;
+
+ hdr->saddr = *saddr;
+ hdr->daddr = *daddr;
+}
+
+static void ndisc_send_skb(struct sk_buff *skb,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
+{
+ struct dst_entry *dst = skb_dst(skb);
+ struct net *net = dev_net(skb->dev);
+ struct sock *sk = net->ipv6.ndisc_sk;
+ struct inet6_dev *idev;
+ int err;
+ struct icmp6hdr *icmp6h = icmp6_hdr(skb);
+ u8 type;
+
+ type = icmp6h->icmp6_type;
+
+ if (!dst) {
+ struct flowi6 fl6;
+ int oif = skb->dev->ifindex;
+
+ icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif);
+ dst = icmp6_dst_alloc(skb->dev, &fl6);
+ if (IS_ERR(dst)) {
+ kfree_skb(skb);
+ return;
+ }
+
+ skb_dst_set(skb, dst);
+ }
+
+ icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len,
+ IPPROTO_ICMPV6,
+ csum_partial(icmp6h,
+ skb->len, 0));
+
+ ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len);
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dst->dev);
+ IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
+
+ err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
+ net, sk, skb, NULL, dst->dev,
+ dst_output);
+ if (!err) {
+ ICMP6MSGOUT_INC_STATS(net, idev, type);
+ ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
+ }
+
+ rcu_read_unlock();
+}
+
+void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
+ const struct in6_addr *solicited_addr,
+ bool router, bool solicited, bool override, bool inc_opt)
+{
+ struct sk_buff *skb;
+ struct in6_addr tmpaddr;
+ struct inet6_ifaddr *ifp;
+ const struct in6_addr *src_addr;
+ struct nd_msg *msg;
+ int optlen = 0;
+
+ /* for anycast or proxy, solicited_addr != src_addr */
+ ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
+ if (ifp) {
+ src_addr = solicited_addr;
+ if (ifp->flags & IFA_F_OPTIMISTIC)
+ override = false;
+ inc_opt |= ifp->idev->cnf.force_tllao;
+ in6_ifa_put(ifp);
+ } else {
+ if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
+ inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
+ &tmpaddr))
+ return;
+ src_addr = &tmpaddr;
+ }
+
+ if (!dev->addr_len)
+ inc_opt = false;
+ if (inc_opt)
+ optlen += ndisc_opt_addr_space(dev,
+ NDISC_NEIGHBOUR_ADVERTISEMENT);
+
+ skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
+ if (!skb)
+ return;
+
+ msg = skb_put(skb, sizeof(*msg));
+ *msg = (struct nd_msg) {
+ .icmph = {
+ .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
+ .icmp6_router = router,
+ .icmp6_solicited = solicited,
+ .icmp6_override = override,
+ },
+ .target = *solicited_addr,
+ };
+
+ if (inc_opt)
+ ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,
+ dev->dev_addr,
+ NDISC_NEIGHBOUR_ADVERTISEMENT);
+
+ ndisc_send_skb(skb, daddr, src_addr);
+}
+
+static void ndisc_send_unsol_na(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+ struct inet6_ifaddr *ifa;
+
+ idev = in6_dev_get(dev);
+ if (!idev)
+ return;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ /* skip tentative addresses until dad completes */
+ if (ifa->flags & IFA_F_TENTATIVE &&
+ !(ifa->flags & IFA_F_OPTIMISTIC))
+ continue;
+
+ ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr,
+ /*router=*/ !!idev->cnf.forwarding,
+ /*solicited=*/ false, /*override=*/ true,
+ /*inc_opt=*/ true);
+ }
+ read_unlock_bh(&idev->lock);
+
+ in6_dev_put(idev);
+}
+
+void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
+ const struct in6_addr *daddr, const struct in6_addr *saddr,
+ u64 nonce)
+{
+ struct sk_buff *skb;
+ struct in6_addr addr_buf;
+ int inc_opt = dev->addr_len;
+ int optlen = 0;
+ struct nd_msg *msg;
+
+ if (!saddr) {
+ if (ipv6_get_lladdr(dev, &addr_buf,
+ (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
+ return;
+ saddr = &addr_buf;
+ }
+
+ if (ipv6_addr_any(saddr))
+ inc_opt = false;
+ if (inc_opt)
+ optlen += ndisc_opt_addr_space(dev,
+ NDISC_NEIGHBOUR_SOLICITATION);
+ if (nonce != 0)
+ optlen += 8;
+
+ skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
+ if (!skb)
+ return;
+
+ msg = skb_put(skb, sizeof(*msg));
+ *msg = (struct nd_msg) {
+ .icmph = {
+ .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
+ },
+ .target = *solicit,
+ };
+
+ if (inc_opt)
+ ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
+ dev->dev_addr,
+ NDISC_NEIGHBOUR_SOLICITATION);
+ if (nonce != 0) {
+ u8 *opt = skb_put(skb, 8);
+
+ opt[0] = ND_OPT_NONCE;
+ opt[1] = 8 >> 3;
+ memcpy(opt + 2, &nonce, 6);
+ }
+
+ ndisc_send_skb(skb, daddr, saddr);
+}
+
+void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
+ const struct in6_addr *daddr)
+{
+ struct sk_buff *skb;
+ struct rs_msg *msg;
+ int send_sllao = dev->addr_len;
+ int optlen = 0;
+
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ /*
+ * According to section 2.2 of RFC 4429, we must not
+ * send router solicitations with a sllao from
+ * optimistic addresses, but we may send the solicitation
+ * if we don't include the sllao. So here we check
+ * if our address is optimistic, and if so, we
+ * suppress the inclusion of the sllao.
+ */
+ if (send_sllao) {
+ struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
+ dev, 1);
+ if (ifp) {
+ if (ifp->flags & IFA_F_OPTIMISTIC) {
+ send_sllao = 0;
+ }
+ in6_ifa_put(ifp);
+ } else {
+ send_sllao = 0;
+ }
+ }
+#endif
+ if (send_sllao)
+ optlen += ndisc_opt_addr_space(dev, NDISC_ROUTER_SOLICITATION);
+
+ skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
+ if (!skb)
+ return;
+
+ msg = skb_put(skb, sizeof(*msg));
+ *msg = (struct rs_msg) {
+ .icmph = {
+ .icmp6_type = NDISC_ROUTER_SOLICITATION,
+ },
+ };
+
+ if (send_sllao)
+ ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
+ dev->dev_addr,
+ NDISC_ROUTER_SOLICITATION);
+
+ ndisc_send_skb(skb, daddr, saddr);
+}
+
+
+static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
+{
+ /*
+ * "The sender MUST return an ICMP
+ * destination unreachable"
+ */
+ dst_link_failure(skb);
+ kfree_skb(skb);
+}
+
+/* Called with locked neigh: either read or both */
+
+static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
+{
+ struct in6_addr *saddr = NULL;
+ struct in6_addr mcaddr;
+ struct net_device *dev = neigh->dev;
+ struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
+ int probes = atomic_read(&neigh->probes);
+
+ if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr,
+ dev, false, 1,
+ IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))
+ saddr = &ipv6_hdr(skb)->saddr;
+ probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES);
+ if (probes < 0) {
+ if (!(neigh->nud_state & NUD_VALID)) {
+ ND_PRINTK(1, dbg,
+ "%s: trying to ucast probe in NUD_INVALID: %pI6\n",
+ __func__, target);
+ }
+ ndisc_send_ns(dev, target, target, saddr, 0);
+ } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) {
+ neigh_app_ns(neigh);
+ } else {
+ addrconf_addr_solict_mult(target, &mcaddr);
+ ndisc_send_ns(dev, target, &mcaddr, saddr, 0);
+ }
+}
+
+static int pndisc_is_router(const void *pkey,
+ struct net_device *dev)
+{
+ struct pneigh_entry *n;
+ int ret = -1;
+
+ read_lock_bh(&nd_tbl.lock);
+ n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
+ if (n)
+ ret = !!(n->flags & NTF_ROUTER);
+ read_unlock_bh(&nd_tbl.lock);
+
+ return ret;
+}
+
+void ndisc_update(const struct net_device *dev, struct neighbour *neigh,
+ const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
+ struct ndisc_options *ndopts)
+{
+ neigh_update(neigh, lladdr, new, flags, 0);
+ /* report ndisc ops about neighbour update */
+ ndisc_ops_update(dev, neigh, flags, icmp6_type, ndopts);
+}
+
+static void ndisc_recv_ns(struct sk_buff *skb)
+{
+ struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
+ const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
+ const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
+ u8 *lladdr = NULL;
+ u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
+ offsetof(struct nd_msg, opt));
+ struct ndisc_options ndopts;
+ struct net_device *dev = skb->dev;
+ struct inet6_ifaddr *ifp;
+ struct inet6_dev *idev = NULL;
+ struct neighbour *neigh;
+ int dad = ipv6_addr_any(saddr);
+ bool inc;
+ int is_router = -1;
+ u64 nonce = 0;
+
+ if (skb->len < sizeof(struct nd_msg)) {
+ ND_PRINTK(2, warn, "NS: packet too short\n");
+ return;
+ }
+
+ if (ipv6_addr_is_multicast(&msg->target)) {
+ ND_PRINTK(2, warn, "NS: multicast target address\n");
+ return;
+ }
+
+ /*
+ * RFC2461 7.1.1:
+ * DAD has to be destined for solicited node multicast address.
+ */
+ if (dad && !ipv6_addr_is_solict_mult(daddr)) {
+ ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n");
+ return;
+ }
+
+ if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
+ ND_PRINTK(2, warn, "NS: invalid ND options\n");
+ return;
+ }
+
+ if (ndopts.nd_opts_src_lladdr) {
+ lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
+ if (!lladdr) {
+ ND_PRINTK(2, warn,
+ "NS: invalid link-layer address length\n");
+ return;
+ }
+
+ /* RFC2461 7.1.1:
+ * If the IP source address is the unspecified address,
+ * there MUST NOT be source link-layer address option
+ * in the message.
+ */
+ if (dad) {
+ ND_PRINTK(2, warn,
+ "NS: bad DAD packet (link-layer address option)\n");
+ return;
+ }
+ }
+ if (ndopts.nd_opts_nonce && ndopts.nd_opts_nonce->nd_opt_len == 1)
+ memcpy(&nonce, (u8 *)(ndopts.nd_opts_nonce + 1), 6);
+
+ inc = ipv6_addr_is_multicast(daddr);
+
+ ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
+ if (ifp) {
+have_ifp:
+ if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
+ if (dad) {
+ if (nonce != 0 && ifp->dad_nonce == nonce) {
+ u8 *np = (u8 *)&nonce;
+ /* Matching nonce if looped back */
+ ND_PRINTK(2, notice,
+ "%s: IPv6 DAD loopback for address %pI6c nonce %pM ignored\n",
+ ifp->idev->dev->name,
+ &ifp->addr, np);
+ goto out;
+ }
+ /*
+ * We are colliding with another node
+ * who is doing DAD
+ * so fail our DAD process
+ */
+ addrconf_dad_failure(skb, ifp);
+ return;
+ } else {
+ /*
+ * This is not a dad solicitation.
+ * If we are an optimistic node,
+ * we should respond.
+ * Otherwise, we should ignore it.
+ */
+ if (!(ifp->flags & IFA_F_OPTIMISTIC))
+ goto out;
+ }
+ }
+
+ idev = ifp->idev;
+ } else {
+ struct net *net = dev_net(dev);
+
+ /* perhaps an address on the master device */
+ if (netif_is_l3_slave(dev)) {
+ struct net_device *mdev;
+
+ mdev = netdev_master_upper_dev_get_rcu(dev);
+ if (mdev) {
+ ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1);
+ if (ifp)
+ goto have_ifp;
+ }
+ }
+
+ idev = in6_dev_get(dev);
+ if (!idev) {
+ /* XXX: count this drop? */
+ return;
+ }
+
+ if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
+ (idev->cnf.forwarding &&
+ (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
+ (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
+ if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
+ skb->pkt_type != PACKET_HOST &&
+ inc &&
+ NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) {
+ /*
+ * for anycast or proxy,
+ * sender should delay its response
+ * by a random time between 0 and
+ * MAX_ANYCAST_DELAY_TIME seconds.
+ * (RFC2461) -- yoshfuji
+ */
+ struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
+ if (n)
+ pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
+ goto out;
+ }
+ } else
+ goto out;
+ }
+
+ if (is_router < 0)
+ is_router = idev->cnf.forwarding;
+
+ if (dad) {
+ ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target,
+ !!is_router, false, (ifp != NULL), true);
+ goto out;
+ }
+
+ if (inc)
+ NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
+ else
+ NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
+
+ /*
+ * update / create cache entry
+ * for the source address
+ */
+ neigh = __neigh_lookup(&nd_tbl, saddr, dev,
+ !inc || lladdr || !dev->addr_len);
+ if (neigh)
+ ndisc_update(dev, neigh, lladdr, NUD_STALE,
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE,
+ NDISC_NEIGHBOUR_SOLICITATION, &ndopts);
+ if (neigh || !dev->header_ops) {
+ ndisc_send_na(dev, saddr, &msg->target, !!is_router,
+ true, (ifp != NULL && inc), inc);
+ if (neigh)
+ neigh_release(neigh);
+ }
+
+out:
+ if (ifp)
+ in6_ifa_put(ifp);
+ else
+ in6_dev_put(idev);
+}
+
+static void ndisc_recv_na(struct sk_buff *skb)
+{
+ struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
+ struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
+ const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
+ u8 *lladdr = NULL;
+ u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
+ offsetof(struct nd_msg, opt));
+ struct ndisc_options ndopts;
+ struct net_device *dev = skb->dev;
+ struct inet6_dev *idev = __in6_dev_get(dev);
+ struct inet6_ifaddr *ifp;
+ struct neighbour *neigh;
+
+ if (skb->len < sizeof(struct nd_msg)) {
+ ND_PRINTK(2, warn, "NA: packet too short\n");
+ return;
+ }
+
+ if (ipv6_addr_is_multicast(&msg->target)) {
+ ND_PRINTK(2, warn, "NA: target address is multicast\n");
+ return;
+ }
+
+ if (ipv6_addr_is_multicast(daddr) &&
+ msg->icmph.icmp6_solicited) {
+ ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n");
+ return;
+ }
+
+ /* For some 802.11 wireless deployments (and possibly other networks),
+ * there will be a NA proxy and unsolicitd packets are attacks
+ * and thus should not be accepted.
+ */
+ if (!msg->icmph.icmp6_solicited && idev &&
+ idev->cnf.drop_unsolicited_na)
+ return;
+
+ if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
+ ND_PRINTK(2, warn, "NS: invalid ND option\n");
+ return;
+ }
+ if (ndopts.nd_opts_tgt_lladdr) {
+ lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
+ if (!lladdr) {
+ ND_PRINTK(2, warn,
+ "NA: invalid link-layer address length\n");
+ return;
+ }
+ }
+ ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
+ if (ifp) {
+ if (skb->pkt_type != PACKET_LOOPBACK
+ && (ifp->flags & IFA_F_TENTATIVE)) {
+ addrconf_dad_failure(skb, ifp);
+ return;
+ }
+ /* What should we make now? The advertisement
+ is invalid, but ndisc specs say nothing
+ about it. It could be misconfiguration, or
+ an smart proxy agent tries to help us :-)
+
+ We should not print the error if NA has been
+ received from loopback - it is just our own
+ unsolicited advertisement.
+ */
+ if (skb->pkt_type != PACKET_LOOPBACK)
+ ND_PRINTK(1, warn,
+ "NA: %pM advertised our address %pI6c on %s!\n",
+ eth_hdr(skb)->h_source, &ifp->addr, ifp->idev->dev->name);
+ in6_ifa_put(ifp);
+ return;
+ }
+ neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
+
+ if (neigh) {
+ u8 old_flags = neigh->flags;
+ struct net *net = dev_net(dev);
+
+ if (neigh->nud_state & NUD_FAILED)
+ goto out;
+
+ /*
+ * Don't update the neighbor cache entry on a proxy NA from
+ * ourselves because either the proxied node is off link or it
+ * has already sent a NA to us.
+ */
+ if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
+ net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp &&
+ pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
+ /* XXX: idev->cnf.proxy_ndp */
+ goto out;
+ }
+
+ ndisc_update(dev, neigh, lladdr,
+ msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
+ NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
+ (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0),
+ NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts);
+
+ if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
+ /*
+ * Change: router to host
+ */
+ rt6_clean_tohost(dev_net(dev), saddr);
+ }
+
+out:
+ neigh_release(neigh);
+ }
+}
+
+static void ndisc_recv_rs(struct sk_buff *skb)
+{
+ struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
+ unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
+ struct neighbour *neigh;
+ struct inet6_dev *idev;
+ const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
+ struct ndisc_options ndopts;
+ u8 *lladdr = NULL;
+
+ if (skb->len < sizeof(*rs_msg))
+ return;
+
+ idev = __in6_dev_get(skb->dev);
+ if (!idev) {
+ ND_PRINTK(1, err, "RS: can't find in6 device\n");
+ return;
+ }
+
+ /* Don't accept RS if we're not in router mode */
+ if (!idev->cnf.forwarding)
+ goto out;
+
+ /*
+ * Don't update NCE if src = ::;
+ * this implies that the source node has no ip address assigned yet.
+ */
+ if (ipv6_addr_any(saddr))
+ goto out;
+
+ /* Parse ND options */
+ if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) {
+ ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n");
+ goto out;
+ }
+
+ if (ndopts.nd_opts_src_lladdr) {
+ lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
+ skb->dev);
+ if (!lladdr)
+ goto out;
+ }
+
+ neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
+ if (neigh) {
+ ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE_ISROUTER,
+ NDISC_ROUTER_SOLICITATION, &ndopts);
+ neigh_release(neigh);
+ }
+out:
+ return;
+}
+
+static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
+{
+ struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh;
+ struct nduseroptmsg *ndmsg;
+ struct net *net = dev_net(ra->dev);
+ int err;
+ int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
+ + (opt->nd_opt_len << 3));
+ size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
+
+ skb = nlmsg_new(msg_size, GFP_ATOMIC);
+ if (!skb) {
+ err = -ENOBUFS;
+ goto errout;
+ }
+
+ nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
+ if (!nlh) {
+ goto nla_put_failure;
+ }
+
+ ndmsg = nlmsg_data(nlh);
+ ndmsg->nduseropt_family = AF_INET6;
+ ndmsg->nduseropt_ifindex = ra->dev->ifindex;
+ ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
+ ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
+ ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
+
+ memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
+
+ if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr))
+ goto nla_put_failure;
+ nlmsg_end(skb, nlh);
+
+ rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
+ return;
+
+nla_put_failure:
+ nlmsg_free(skb);
+ err = -EMSGSIZE;
+errout:
+ rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
+}
+
+static void ndisc_router_discovery(struct sk_buff *skb)
+{
+ struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
+ struct neighbour *neigh = NULL;
+ struct inet6_dev *in6_dev;
+ struct fib6_info *rt = NULL;
+ struct net *net;
+ int lifetime;
+ struct ndisc_options ndopts;
+ int optlen;
+ unsigned int pref = 0;
+ __u32 old_if_flags;
+ bool send_ifinfo_notify = false;
+
+ __u8 *opt = (__u8 *)(ra_msg + 1);
+
+ optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) -
+ sizeof(struct ra_msg);
+
+ ND_PRINTK(2, info,
+ "RA: %s, dev: %s\n",
+ __func__, skb->dev->name);
+ if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
+ ND_PRINTK(2, warn, "RA: source address is not link-local\n");
+ return;
+ }
+ if (optlen < 0) {
+ ND_PRINTK(2, warn, "RA: packet too short\n");
+ return;
+ }
+
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+ if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
+ ND_PRINTK(2, warn, "RA: from host or unauthorized router\n");
+ return;
+ }
+#endif
+
+ /*
+ * set the RA_RECV flag in the interface
+ */
+
+ in6_dev = __in6_dev_get(skb->dev);
+ if (!in6_dev) {
+ ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n",
+ skb->dev->name);
+ return;
+ }
+
+ if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) {
+ ND_PRINTK(2, warn, "RA: invalid ND options\n");
+ return;
+ }
+
+ if (!ipv6_accept_ra(in6_dev)) {
+ ND_PRINTK(2, info,
+ "RA: %s, did not accept ra for dev: %s\n",
+ __func__, skb->dev->name);
+ goto skip_linkparms;
+ }
+
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+ /* skip link-specific parameters from interior routers */
+ if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
+ ND_PRINTK(2, info,
+ "RA: %s, nodetype is NODEFAULT, dev: %s\n",
+ __func__, skb->dev->name);
+ goto skip_linkparms;
+ }
+#endif
+
+ if (in6_dev->if_flags & IF_RS_SENT) {
+ /*
+ * flag that an RA was received after an RS was sent
+ * out on this interface.
+ */
+ in6_dev->if_flags |= IF_RA_RCVD;
+ }
+
+ /*
+ * Remember the managed/otherconf flags from most recently
+ * received RA message (RFC 2462) -- yoshfuji
+ */
+ old_if_flags = in6_dev->if_flags;
+ in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
+ IF_RA_OTHERCONF)) |
+ (ra_msg->icmph.icmp6_addrconf_managed ?
+ IF_RA_MANAGED : 0) |
+ (ra_msg->icmph.icmp6_addrconf_other ?
+ IF_RA_OTHERCONF : 0);
+
+ if (old_if_flags != in6_dev->if_flags)
+ send_ifinfo_notify = true;
+
+ if (!in6_dev->cnf.accept_ra_defrtr) {
+ ND_PRINTK(2, info,
+ "RA: %s, defrtr is false for dev: %s\n",
+ __func__, skb->dev->name);
+ goto skip_defrtr;
+ }
+
+ /* Do not accept RA with source-addr found on local machine unless
+ * accept_ra_from_local is set to true.
+ */
+ net = dev_net(in6_dev->dev);
+ if (!in6_dev->cnf.accept_ra_from_local &&
+ ipv6_chk_addr(net, &ipv6_hdr(skb)->saddr, in6_dev->dev, 0)) {
+ ND_PRINTK(2, info,
+ "RA from local address detected on dev: %s: default router ignored\n",
+ skb->dev->name);
+ goto skip_defrtr;
+ }
+
+ lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
+
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ pref = ra_msg->icmph.icmp6_router_pref;
+ /* 10b is handled as if it were 00b (medium) */
+ if (pref == ICMPV6_ROUTER_PREF_INVALID ||
+ !in6_dev->cnf.accept_ra_rtr_pref)
+ pref = ICMPV6_ROUTER_PREF_MEDIUM;
+#endif
+
+ rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev);
+
+ if (rt) {
+ neigh = ip6_neigh_lookup(&rt->fib6_nh.nh_gw,
+ rt->fib6_nh.nh_dev, NULL,
+ &ipv6_hdr(skb)->saddr);
+ if (!neigh) {
+ ND_PRINTK(0, err,
+ "RA: %s got default router without neighbour\n",
+ __func__);
+ fib6_info_release(rt);
+ return;
+ }
+ }
+ if (rt && lifetime == 0) {
+ ip6_del_rt(net, rt);
+ rt = NULL;
+ }
+
+ ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n",
+ rt, lifetime, skb->dev->name);
+ if (!rt && lifetime) {
+ ND_PRINTK(3, info, "RA: adding default router\n");
+
+ rt = rt6_add_dflt_router(net, &ipv6_hdr(skb)->saddr,
+ skb->dev, pref);
+ if (!rt) {
+ ND_PRINTK(0, err,
+ "RA: %s failed to add default route\n",
+ __func__);
+ return;
+ }
+
+ neigh = ip6_neigh_lookup(&rt->fib6_nh.nh_gw,
+ rt->fib6_nh.nh_dev, NULL,
+ &ipv6_hdr(skb)->saddr);
+ if (!neigh) {
+ ND_PRINTK(0, err,
+ "RA: %s got default router without neighbour\n",
+ __func__);
+ fib6_info_release(rt);
+ return;
+ }
+ neigh->flags |= NTF_ROUTER;
+ } else if (rt) {
+ rt->fib6_flags = (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
+ }
+
+ if (rt)
+ fib6_set_expires(rt, jiffies + (HZ * lifetime));
+ if (in6_dev->cnf.accept_ra_min_hop_limit < 256 &&
+ ra_msg->icmph.icmp6_hop_limit) {
+ if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) {
+ in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
+ fib6_metric_set(rt, RTAX_HOPLIMIT,
+ ra_msg->icmph.icmp6_hop_limit);
+ } else {
+ ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n");
+ }
+ }
+
+skip_defrtr:
+
+ /*
+ * Update Reachable Time and Retrans Timer
+ */
+
+ if (in6_dev->nd_parms) {
+ unsigned long rtime = ntohl(ra_msg->retrans_timer);
+
+ if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
+ rtime = (rtime*HZ)/1000;
+ if (rtime < HZ/10)
+ rtime = HZ/10;
+ NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime);
+ in6_dev->tstamp = jiffies;
+ send_ifinfo_notify = true;
+ }
+
+ rtime = ntohl(ra_msg->reachable_time);
+ if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
+ rtime = (rtime*HZ)/1000;
+
+ if (rtime < HZ/10)
+ rtime = HZ/10;
+
+ if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) {
+ NEIGH_VAR_SET(in6_dev->nd_parms,
+ BASE_REACHABLE_TIME, rtime);
+ NEIGH_VAR_SET(in6_dev->nd_parms,
+ GC_STALETIME, 3 * rtime);
+ in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
+ in6_dev->tstamp = jiffies;
+ send_ifinfo_notify = true;
+ }
+ }
+ }
+
+ /*
+ * Send a notify if RA changed managed/otherconf flags or timer settings
+ */
+ if (send_ifinfo_notify)
+ inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
+
+skip_linkparms:
+
+ /*
+ * Process options.
+ */
+
+ if (!neigh)
+ neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
+ skb->dev, 1);
+ if (neigh) {
+ u8 *lladdr = NULL;
+ if (ndopts.nd_opts_src_lladdr) {
+ lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
+ skb->dev);
+ if (!lladdr) {
+ ND_PRINTK(2, warn,
+ "RA: invalid link-layer address length\n");
+ goto out;
+ }
+ }
+ ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
+ NEIGH_UPDATE_F_ISROUTER,
+ NDISC_ROUTER_ADVERTISEMENT, &ndopts);
+ }
+
+ if (!ipv6_accept_ra(in6_dev)) {
+ ND_PRINTK(2, info,
+ "RA: %s, accept_ra is false for dev: %s\n",
+ __func__, skb->dev->name);
+ goto out;
+ }
+
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ if (!in6_dev->cnf.accept_ra_from_local &&
+ ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,
+ in6_dev->dev, 0)) {
+ ND_PRINTK(2, info,
+ "RA from local address detected on dev: %s: router info ignored.\n",
+ skb->dev->name);
+ goto skip_routeinfo;
+ }
+
+ if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
+ struct nd_opt_hdr *p;
+ for (p = ndopts.nd_opts_ri;
+ p;
+ p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
+ struct route_info *ri = (struct route_info *)p;
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+ if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
+ ri->prefix_len == 0)
+ continue;
+#endif
+ if (ri->prefix_len == 0 &&
+ !in6_dev->cnf.accept_ra_defrtr)
+ continue;
+ if (ri->prefix_len < in6_dev->cnf.accept_ra_rt_info_min_plen)
+ continue;
+ if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
+ continue;
+ rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3,
+ &ipv6_hdr(skb)->saddr);
+ }
+ }
+
+skip_routeinfo:
+#endif
+
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+ /* skip link-specific ndopts from interior routers */
+ if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
+ ND_PRINTK(2, info,
+ "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n",
+ __func__, skb->dev->name);
+ goto out;
+ }
+#endif
+
+ if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
+ struct nd_opt_hdr *p;
+ for (p = ndopts.nd_opts_pi;
+ p;
+ p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
+ addrconf_prefix_rcv(skb->dev, (u8 *)p,
+ (p->nd_opt_len) << 3,
+ ndopts.nd_opts_src_lladdr != NULL);
+ }
+ }
+
+ if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) {
+ __be32 n;
+ u32 mtu;
+
+ memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
+ mtu = ntohl(n);
+
+ if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
+ ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu);
+ } else if (in6_dev->cnf.mtu6 != mtu) {
+ in6_dev->cnf.mtu6 = mtu;
+ fib6_metric_set(rt, RTAX_MTU, mtu);
+ rt6_mtu_change(skb->dev, mtu);
+ }
+ }
+
+ if (ndopts.nd_useropts) {
+ struct nd_opt_hdr *p;
+ for (p = ndopts.nd_useropts;
+ p;
+ p = ndisc_next_useropt(skb->dev, p,
+ ndopts.nd_useropts_end)) {
+ ndisc_ra_useropt(skb, p);
+ }
+ }
+
+ if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
+ ND_PRINTK(2, warn, "RA: invalid RA options\n");
+ }
+out:
+ fib6_info_release(rt);
+ if (neigh)
+ neigh_release(neigh);
+}
+
+static void ndisc_redirect_rcv(struct sk_buff *skb)
+{
+ u8 *hdr;
+ struct ndisc_options ndopts;
+ struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb);
+ u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
+ offsetof(struct rd_msg, opt));
+
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+ switch (skb->ndisc_nodetype) {
+ case NDISC_NODETYPE_HOST:
+ case NDISC_NODETYPE_NODEFAULT:
+ ND_PRINTK(2, warn,
+ "Redirect: from host or unauthorized router\n");
+ return;
+ }
+#endif
+
+ if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
+ ND_PRINTK(2, warn,
+ "Redirect: source address is not link-local\n");
+ return;
+ }
+
+ if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts))
+ return;
+
+ if (!ndopts.nd_opts_rh) {
+ ip6_redirect_no_header(skb, dev_net(skb->dev),
+ skb->dev->ifindex, 0);
+ return;
+ }
+
+ hdr = (u8 *)ndopts.nd_opts_rh;
+ hdr += 8;
+ if (!pskb_pull(skb, hdr - skb_transport_header(skb)))
+ return;
+
+ icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);
+}
+
+static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb,
+ struct sk_buff *orig_skb,
+ int rd_len)
+{
+ u8 *opt = skb_put(skb, rd_len);
+
+ memset(opt, 0, 8);
+ *(opt++) = ND_OPT_REDIRECT_HDR;
+ *(opt++) = (rd_len >> 3);
+ opt += 6;
+
+ skb_copy_bits(orig_skb, skb_network_offset(orig_skb), opt,
+ rd_len - 8);
+}
+
+void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
+{
+ struct net_device *dev = skb->dev;
+ struct net *net = dev_net(dev);
+ struct sock *sk = net->ipv6.ndisc_sk;
+ int optlen = 0;
+ struct inet_peer *peer;
+ struct sk_buff *buff;
+ struct rd_msg *msg;
+ struct in6_addr saddr_buf;
+ struct rt6_info *rt;
+ struct dst_entry *dst;
+ struct flowi6 fl6;
+ int rd_len;
+ u8 ha_buf[MAX_ADDR_LEN], *ha = NULL,
+ ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL;
+ bool ret;
+
+ if (netif_is_l3_master(skb->dev)) {
+ dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif);
+ if (!dev)
+ return;
+ }
+
+ if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
+ ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n",
+ dev->name);
+ return;
+ }
+
+ if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
+ ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
+ ND_PRINTK(2, warn,
+ "Redirect: target address is not link-local unicast\n");
+ return;
+ }
+
+ icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT,
+ &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
+
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (dst->error) {
+ dst_release(dst);
+ return;
+ }
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
+ if (IS_ERR(dst))
+ return;
+
+ rt = (struct rt6_info *) dst;
+
+ if (rt->rt6i_flags & RTF_GATEWAY) {
+ ND_PRINTK(2, warn,
+ "Redirect: destination is not a neighbour\n");
+ goto release;
+ }
+ peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1);
+ ret = inet_peer_xrlim_allow(peer, 1*HZ);
+ if (peer)
+ inet_putpeer(peer);
+ if (!ret)
+ goto release;
+
+ if (dev->addr_len) {
+ struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target);
+ if (!neigh) {
+ ND_PRINTK(2, warn,
+ "Redirect: no neigh for target address\n");
+ goto release;
+ }
+
+ read_lock_bh(&neigh->lock);
+ if (neigh->nud_state & NUD_VALID) {
+ memcpy(ha_buf, neigh->ha, dev->addr_len);
+ read_unlock_bh(&neigh->lock);
+ ha = ha_buf;
+ optlen += ndisc_redirect_opt_addr_space(dev, neigh,
+ ops_data_buf,
+ &ops_data);
+ } else
+ read_unlock_bh(&neigh->lock);
+
+ neigh_release(neigh);
+ }
+
+ rd_len = min_t(unsigned int,
+ IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen,
+ skb->len + 8);
+ rd_len &= ~0x7;
+ optlen += rd_len;
+
+ buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
+ if (!buff)
+ goto release;
+
+ msg = skb_put(buff, sizeof(*msg));
+ *msg = (struct rd_msg) {
+ .icmph = {
+ .icmp6_type = NDISC_REDIRECT,
+ },
+ .target = *target,
+ .dest = ipv6_hdr(skb)->daddr,
+ };
+
+ /*
+ * include target_address option
+ */
+
+ if (ha)
+ ndisc_fill_redirect_addr_option(buff, ha, ops_data);
+
+ /*
+ * build redirect option and copy skb over to the new packet.
+ */
+
+ if (rd_len)
+ ndisc_fill_redirect_hdr_option(buff, skb, rd_len);
+
+ skb_dst_set(buff, dst);
+ ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf);
+ return;
+
+release:
+ dst_release(dst);
+}
+
+static void pndisc_redo(struct sk_buff *skb)
+{
+ ndisc_recv_ns(skb);
+ kfree_skb(skb);
+}
+
+static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb)
+{
+ struct inet6_dev *idev = __in6_dev_get(skb->dev);
+
+ if (!idev)
+ return true;
+ if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED &&
+ idev->cnf.suppress_frag_ndisc) {
+ net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n");
+ return true;
+ }
+ return false;
+}
+
+int ndisc_rcv(struct sk_buff *skb)
+{
+ struct nd_msg *msg;
+
+ if (ndisc_suppress_frag_ndisc(skb))
+ return 0;
+
+ if (skb_linearize(skb))
+ return 0;
+
+ msg = (struct nd_msg *)skb_transport_header(skb);
+
+ __skb_push(skb, skb->data - skb_transport_header(skb));
+
+ if (ipv6_hdr(skb)->hop_limit != 255) {
+ ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n",
+ ipv6_hdr(skb)->hop_limit);
+ return 0;
+ }
+
+ if (msg->icmph.icmp6_code != 0) {
+ ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n",
+ msg->icmph.icmp6_code);
+ return 0;
+ }
+
+ switch (msg->icmph.icmp6_type) {
+ case NDISC_NEIGHBOUR_SOLICITATION:
+ memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
+ ndisc_recv_ns(skb);
+ break;
+
+ case NDISC_NEIGHBOUR_ADVERTISEMENT:
+ ndisc_recv_na(skb);
+ break;
+
+ case NDISC_ROUTER_SOLICITATION:
+ ndisc_recv_rs(skb);
+ break;
+
+ case NDISC_ROUTER_ADVERTISEMENT:
+ ndisc_router_discovery(skb);
+ break;
+
+ case NDISC_REDIRECT:
+ ndisc_redirect_rcv(skb);
+ break;
+ }
+
+ return 0;
+}
+
+static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct netdev_notifier_change_info *change_info;
+ struct net *net = dev_net(dev);
+ struct inet6_dev *idev;
+
+ switch (event) {
+ case NETDEV_CHANGEADDR:
+ neigh_changeaddr(&nd_tbl, dev);
+ fib6_run_gc(0, net, false);
+ /* fallthrough */
+ case NETDEV_UP:
+ idev = in6_dev_get(dev);
+ if (!idev)
+ break;
+ if (idev->cnf.ndisc_notify ||
+ net->ipv6.devconf_all->ndisc_notify)
+ ndisc_send_unsol_na(dev);
+ in6_dev_put(idev);
+ break;
+ case NETDEV_CHANGE:
+ change_info = ptr;
+ if (change_info->flags_changed & IFF_NOARP)
+ neigh_changeaddr(&nd_tbl, dev);
+ break;
+ case NETDEV_DOWN:
+ neigh_ifdown(&nd_tbl, dev);
+ fib6_run_gc(0, net, false);
+ break;
+ case NETDEV_NOTIFY_PEERS:
+ ndisc_send_unsol_na(dev);
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block ndisc_netdev_notifier = {
+ .notifier_call = ndisc_netdev_event,
+ .priority = ADDRCONF_NOTIFY_PRIORITY - 5,
+};
+
+#ifdef CONFIG_SYSCTL
+static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
+ const char *func, const char *dev_name)
+{
+ static char warncomm[TASK_COMM_LEN];
+ static int warned;
+ if (strcmp(warncomm, current->comm) && warned < 5) {
+ strcpy(warncomm, current->comm);
+ pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n",
+ warncomm, func,
+ dev_name, ctl->procname,
+ dev_name, ctl->procname);
+ warned++;
+ }
+}
+
+int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct net_device *dev = ctl->extra1;
+ struct inet6_dev *idev;
+ int ret;
+
+ if ((strcmp(ctl->procname, "retrans_time") == 0) ||
+ (strcmp(ctl->procname, "base_reachable_time") == 0))
+ ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
+
+ if (strcmp(ctl->procname, "retrans_time") == 0)
+ ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos);
+
+ else if (strcmp(ctl->procname, "base_reachable_time") == 0)
+ ret = neigh_proc_dointvec_jiffies(ctl, write,
+ buffer, lenp, ppos);
+
+ else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
+ (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
+ ret = neigh_proc_dointvec_ms_jiffies(ctl, write,
+ buffer, lenp, ppos);
+ else
+ ret = -1;
+
+ if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
+ if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME))
+ idev->nd_parms->reachable_time =
+ neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME));
+ idev->tstamp = jiffies;
+ inet6_ifinfo_notify(RTM_NEWLINK, idev);
+ in6_dev_put(idev);
+ }
+ return ret;
+}
+
+
+#endif
+
+static int __net_init ndisc_net_init(struct net *net)
+{
+ struct ipv6_pinfo *np;
+ struct sock *sk;
+ int err;
+
+ err = inet_ctl_sock_create(&sk, PF_INET6,
+ SOCK_RAW, IPPROTO_ICMPV6, net);
+ if (err < 0) {
+ ND_PRINTK(0, err,
+ "NDISC: Failed to initialize the control socket (err %d)\n",
+ err);
+ return err;
+ }
+
+ net->ipv6.ndisc_sk = sk;
+
+ np = inet6_sk(sk);
+ np->hop_limit = 255;
+ /* Do not loopback ndisc messages */
+ np->mc_loop = 0;
+
+ return 0;
+}
+
+static void __net_exit ndisc_net_exit(struct net *net)
+{
+ inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
+}
+
+static struct pernet_operations ndisc_net_ops = {
+ .init = ndisc_net_init,
+ .exit = ndisc_net_exit,
+};
+
+int __init ndisc_init(void)
+{
+ int err;
+
+ err = register_pernet_subsys(&ndisc_net_ops);
+ if (err)
+ return err;
+ /*
+ * Initialize the neighbour table
+ */
+ neigh_table_init(NEIGH_ND_TABLE, &nd_tbl);
+
+#ifdef CONFIG_SYSCTL
+ err = neigh_sysctl_register(NULL, &nd_tbl.parms,
+ ndisc_ifinfo_sysctl_change);
+ if (err)
+ goto out_unregister_pernet;
+out:
+#endif
+ return err;
+
+#ifdef CONFIG_SYSCTL
+out_unregister_pernet:
+ unregister_pernet_subsys(&ndisc_net_ops);
+ goto out;
+#endif
+}
+
+int __init ndisc_late_init(void)
+{
+ return register_netdevice_notifier(&ndisc_netdev_notifier);
+}
+
+void ndisc_late_cleanup(void)
+{
+ unregister_netdevice_notifier(&ndisc_netdev_notifier);
+}
+
+void ndisc_cleanup(void)
+{
+#ifdef CONFIG_SYSCTL
+ neigh_sysctl_unregister(&nd_tbl.parms);
+#endif
+ neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl);
+ unregister_pernet_subsys(&ndisc_net_ops);
+}
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
new file mode 100644
index 0000000..8b075f0
--- /dev/null
+++ b/net/ipv6/netfilter.c
@@ -0,0 +1,129 @@
+/*
+ * IPv6 specific functions of netfilter core
+ *
+ * Rusty Russell (C) 2000 -- This code is GPL.
+ * Patrick McHardy (C) 2006-2012
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/ipv6.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/export.h>
+#include <net/addrconf.h>
+#include <net/dst.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/xfrm.h>
+#include <net/netfilter/nf_queue.h>
+
+int ip6_route_me_harder(struct net *net, struct sk_buff *skb)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct sock *sk = sk_to_full_sk(skb->sk);
+ unsigned int hh_len;
+ struct dst_entry *dst;
+ struct flowi6 fl6 = {
+ .flowi6_oif = sk && sk->sk_bound_dev_if ? sk->sk_bound_dev_if :
+ rt6_need_strict(&iph->daddr) ? skb_dst(skb)->dev->ifindex : 0,
+ .flowi6_mark = skb->mark,
+ .flowi6_uid = sock_net_uid(net, sk),
+ .daddr = iph->daddr,
+ .saddr = iph->saddr,
+ };
+ int err;
+
+ dst = ip6_route_output(net, sk, &fl6);
+ err = dst->error;
+ if (err) {
+ IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
+ net_dbg_ratelimited("ip6_route_me_harder: No more route\n");
+ dst_release(dst);
+ return err;
+ }
+
+ /* Drop old route. */
+ skb_dst_drop(skb);
+
+ skb_dst_set(skb, dst);
+
+#ifdef CONFIG_XFRM
+ if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
+ xfrm_decode_session(skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) {
+ skb_dst_set(skb, NULL);
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0);
+ if (IS_ERR(dst))
+ return PTR_ERR(dst);
+ skb_dst_set(skb, dst);
+ }
+#endif
+
+ /* Change in oif may mean change in hh_len. */
+ hh_len = skb_dst(skb)->dev->hard_header_len;
+ if (skb_headroom(skb) < hh_len &&
+ pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)),
+ 0, GFP_ATOMIC))
+ return -ENOMEM;
+
+ return 0;
+}
+EXPORT_SYMBOL(ip6_route_me_harder);
+
+static int nf_ip6_reroute(struct sk_buff *skb,
+ const struct nf_queue_entry *entry)
+{
+ struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
+
+ if (entry->state.hook == NF_INET_LOCAL_OUT) {
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
+ !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) ||
+ skb->mark != rt_info->mark)
+ return ip6_route_me_harder(entry->state.net, skb);
+ }
+ return 0;
+}
+
+static int nf_ip6_route(struct net *net, struct dst_entry **dst,
+ struct flowi *fl, bool strict)
+{
+ static const struct ipv6_pinfo fake_pinfo;
+ static const struct inet_sock fake_sk = {
+ /* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */
+ .sk.sk_bound_dev_if = 1,
+ .pinet6 = (struct ipv6_pinfo *) &fake_pinfo,
+ };
+ const void *sk = strict ? &fake_sk : NULL;
+ struct dst_entry *result;
+ int err;
+
+ result = ip6_route_output(net, sk, &fl->u.ip6);
+ err = result->error;
+ if (err)
+ dst_release(result);
+ else
+ *dst = result;
+ return err;
+}
+
+static const struct nf_ipv6_ops ipv6ops = {
+ .chk_addr = ipv6_chk_addr,
+ .route_input = ip6_route_input,
+ .fragment = ip6_fragment,
+ .route = nf_ip6_route,
+ .reroute = nf_ip6_reroute,
+};
+
+int __init ipv6_netfilter_init(void)
+{
+ RCU_INIT_POINTER(nf_ipv6_ops, &ipv6ops);
+ return 0;
+}
+
+/* This can be called from inet6_init() on errors, so it cannot
+ * be marked __exit. -DaveM
+ */
+void ipv6_netfilter_fini(void)
+{
+ RCU_INIT_POINTER(nf_ipv6_ops, NULL);
+}
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
new file mode 100644
index 0000000..339d076
--- /dev/null
+++ b/net/ipv6/netfilter/Kconfig
@@ -0,0 +1,351 @@
+#
+# IP netfilter configuration
+#
+
+menu "IPv6: Netfilter Configuration"
+ depends on INET && IPV6 && NETFILTER
+
+config NF_SOCKET_IPV6
+ tristate "IPv6 socket lookup support"
+ help
+ This option enables the IPv6 socket lookup infrastructure. This
+ is used by the {ip6,nf}tables socket match.
+
+config NF_TPROXY_IPV6
+ tristate "IPv6 tproxy support"
+
+if NF_TABLES
+
+config NF_TABLES_IPV6
+ bool "IPv6 nf_tables support"
+ help
+ This option enables the IPv6 support for nf_tables.
+
+if NF_TABLES_IPV6
+
+config NFT_CHAIN_ROUTE_IPV6
+ tristate "IPv6 nf_tables route chain support"
+ help
+ This option enables the "route" chain for IPv6 in nf_tables. This
+ chain type is used to force packet re-routing after mangling header
+ fields such as the source, destination, flowlabel, hop-limit and
+ the packet mark.
+
+if NF_NAT_IPV6
+
+config NFT_CHAIN_NAT_IPV6
+ tristate "IPv6 nf_tables nat chain support"
+ help
+ This option enables the "nat" chain for IPv6 in nf_tables. This
+ chain type is used to perform Network Address Translation (NAT)
+ packet transformations such as the source, destination address and
+ source and destination ports.
+
+config NFT_MASQ_IPV6
+ tristate "IPv6 masquerade support for nf_tables"
+ depends on NFT_MASQ
+ select NF_NAT_MASQUERADE_IPV6
+ help
+ This is the expression that provides IPv4 masquerading support for
+ nf_tables.
+
+config NFT_REDIR_IPV6
+ tristate "IPv6 redirect support for nf_tables"
+ depends on NFT_REDIR
+ select NF_NAT_REDIRECT
+ help
+ This is the expression that provides IPv4 redirect support for
+ nf_tables.
+
+endif # NF_NAT_IPV6
+
+config NFT_REJECT_IPV6
+ select NF_REJECT_IPV6
+ default NFT_REJECT
+ tristate
+
+config NFT_DUP_IPV6
+ tristate "IPv6 nf_tables packet duplication support"
+ depends on !NF_CONNTRACK || NF_CONNTRACK
+ select NF_DUP_IPV6
+ help
+ This module enables IPv6 packet duplication support for nf_tables.
+
+config NFT_FIB_IPV6
+ tristate "nf_tables fib / ipv6 route lookup support"
+ select NFT_FIB
+ help
+ This module enables IPv6 FIB lookups, e.g. for reverse path filtering.
+ It also allows query of the FIB for the route type, e.g. local, unicast,
+ multicast or blackhole.
+
+endif # NF_TABLES_IPV6
+endif # NF_TABLES
+
+config NF_FLOW_TABLE_IPV6
+ tristate "Netfilter flow table IPv6 module"
+ depends on NF_FLOW_TABLE
+ help
+ This option adds the flow table IPv6 support.
+
+ To compile it as a module, choose M here.
+
+config NF_DUP_IPV6
+ tristate "Netfilter IPv6 packet duplication to alternate destination"
+ depends on !NF_CONNTRACK || NF_CONNTRACK
+ help
+ This option enables the nf_dup_ipv6 core, which duplicates an IPv6
+ packet to be rerouted to another destination.
+
+config NF_REJECT_IPV6
+ tristate "IPv6 packet rejection"
+ default m if NETFILTER_ADVANCED=n
+
+config NF_LOG_IPV6
+ tristate "IPv6 packet logging"
+ default m if NETFILTER_ADVANCED=n
+ select NF_LOG_COMMON
+
+config NF_NAT_IPV6
+ tristate "IPv6 NAT"
+ depends on NF_CONNTRACK
+ depends on NETFILTER_ADVANCED
+ select NF_NAT
+ help
+ The IPv6 NAT option allows masquerading, port forwarding and other
+ forms of full Network Address Port Translation. This can be
+ controlled by iptables or nft.
+
+if NF_NAT_IPV6
+
+config NF_NAT_MASQUERADE_IPV6
+ bool
+
+endif # NF_NAT_IPV6
+
+config IP6_NF_IPTABLES
+ tristate "IP6 tables support (required for filtering)"
+ depends on INET && IPV6
+ select NETFILTER_XTABLES
+ default m if NETFILTER_ADVANCED=n
+ help
+ ip6tables is a general, extensible packet identification framework.
+ Currently only the packet filtering and packet mangling subsystem
+ for IPv6 use this, but connection tracking is going to follow.
+ Say 'Y' or 'M' here if you want to use either of those.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+if IP6_NF_IPTABLES
+
+# The simple matches.
+config IP6_NF_MATCH_AH
+ tristate '"ah" match support'
+ depends on NETFILTER_ADVANCED
+ help
+ This module allows one to match AH packets.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_MATCH_EUI64
+ tristate '"eui64" address check'
+ depends on NETFILTER_ADVANCED
+ help
+ This module performs checking on the IPv6 source address
+ Compares the last 64 bits with the EUI64 (delivered
+ from the MAC address) address
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_MATCH_FRAG
+ tristate '"frag" Fragmentation header match support'
+ depends on NETFILTER_ADVANCED
+ help
+ frag matching allows you to match packets based on the fragmentation
+ header of the packet.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_MATCH_OPTS
+ tristate '"hbh" hop-by-hop and "dst" opts header match support'
+ depends on NETFILTER_ADVANCED
+ help
+ This allows one to match packets based on the hop-by-hop
+ and destination options headers of a packet.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_MATCH_HL
+ tristate '"hl" hoplimit match support'
+ depends on NETFILTER_ADVANCED
+ select NETFILTER_XT_MATCH_HL
+ ---help---
+ This is a backwards-compat option for the user's convenience
+ (e.g. when running oldconfig). It selects
+ CONFIG_NETFILTER_XT_MATCH_HL.
+
+config IP6_NF_MATCH_IPV6HEADER
+ tristate '"ipv6header" IPv6 Extension Headers Match'
+ default m if NETFILTER_ADVANCED=n
+ help
+ This module allows one to match packets based upon
+ the ipv6 extension headers.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_MATCH_MH
+ tristate '"mh" match support'
+ depends on NETFILTER_ADVANCED
+ help
+ This module allows one to match MH packets.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_MATCH_RPFILTER
+ tristate '"rpfilter" reverse path filter match support'
+ depends on NETFILTER_ADVANCED
+ depends on IP6_NF_MANGLE || IP6_NF_RAW
+ ---help---
+ This option allows you to match packets whose replies would
+ go out via the interface the packet came in.
+
+ To compile it as a module, choose M here. If unsure, say N.
+ The module will be called ip6t_rpfilter.
+
+config IP6_NF_MATCH_RT
+ tristate '"rt" Routing header match support'
+ depends on NETFILTER_ADVANCED
+ help
+ rt matching allows you to match packets based on the routing
+ header of the packet.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_MATCH_SRH
+ tristate '"srh" Segment Routing header match support'
+ depends on NETFILTER_ADVANCED
+ help
+ srh matching allows you to match packets based on the segment
+ routing header of the packet.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+# The targets
+config IP6_NF_TARGET_HL
+ tristate '"HL" hoplimit target support'
+ depends on NETFILTER_ADVANCED && IP6_NF_MANGLE
+ select NETFILTER_XT_TARGET_HL
+ ---help---
+ This is a backwards-compatible option for the user's convenience
+ (e.g. when running oldconfig). It selects
+ CONFIG_NETFILTER_XT_TARGET_HL.
+
+config IP6_NF_FILTER
+ tristate "Packet filtering"
+ default m if NETFILTER_ADVANCED=n
+ help
+ Packet filtering defines a table `filter', which has a series of
+ rules for simple packet filtering at local input, forwarding and
+ local output. See the man page for iptables(8).
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_TARGET_REJECT
+ tristate "REJECT target support"
+ depends on IP6_NF_FILTER
+ select NF_REJECT_IPV6
+ default m if NETFILTER_ADVANCED=n
+ help
+ The REJECT target allows a filtering rule to specify that an ICMPv6
+ error should be issued in response to an incoming packet, rather
+ than silently being dropped.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_TARGET_SYNPROXY
+ tristate "SYNPROXY target support"
+ depends on NF_CONNTRACK && NETFILTER_ADVANCED
+ select NETFILTER_SYNPROXY
+ select SYN_COOKIES
+ help
+ The SYNPROXY target allows you to intercept TCP connections and
+ establish them using syncookies before they are passed on to the
+ server. This allows to avoid conntrack and server resource usage
+ during SYN-flood attacks.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_MANGLE
+ tristate "Packet mangling"
+ default m if NETFILTER_ADVANCED=n
+ help
+ This option adds a `mangle' table to iptables: see the man page for
+ iptables(8). This table is used for various packet alterations
+ which can effect how the packet is routed.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_RAW
+ tristate 'raw table support (required for TRACE)'
+ help
+ This option adds a `raw' table to ip6tables. This table is the very
+ first in the netfilter framework and hooks in at the PREROUTING
+ and OUTPUT chains.
+
+ If you want to compile it as a module, say M here and read
+ <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
+
+# security table for MAC policy
+config IP6_NF_SECURITY
+ tristate "Security table"
+ depends on SECURITY
+ depends on NETFILTER_ADVANCED
+ help
+ This option adds a `security' table to iptables, for use
+ with Mandatory Access Control (MAC) policy.
+
+ If unsure, say N.
+
+config IP6_NF_NAT
+ tristate "ip6tables NAT support"
+ depends on NF_CONNTRACK
+ depends on NETFILTER_ADVANCED
+ select NF_NAT
+ select NF_NAT_IPV6
+ select NETFILTER_XT_NAT
+ help
+ This enables the `nat' table in ip6tables. This allows masquerading,
+ port forwarding and other forms of full Network Address Port
+ Translation.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+if IP6_NF_NAT
+
+config IP6_NF_TARGET_MASQUERADE
+ tristate "MASQUERADE target support"
+ select NF_NAT_MASQUERADE_IPV6
+ help
+ Masquerading is a special case of NAT: all outgoing connections are
+ changed to seem to come from a particular interface's address, and
+ if the interface goes down, those connections are lost. This is
+ only useful for dialup accounts with dynamic IP address (ie. your IP
+ address will be different on next dialup).
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config IP6_NF_TARGET_NPT
+ tristate "NPT (Network Prefix translation) target support"
+ help
+ This option adds the `SNPT' and `DNPT' target, which perform
+ stateless IPv6-to-IPv6 Network Prefix Translation per RFC 6296.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+endif # IP6_NF_NAT
+
+endif # IP6_NF_IPTABLES
+endmenu
+
+config NF_DEFRAG_IPV6
+ tristate
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
new file mode 100644
index 0000000..200c0c2
--- /dev/null
+++ b/net/ipv6/netfilter/Makefile
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the netfilter modules on top of IPv6.
+#
+
+# Link order matters here.
+obj-$(CONFIG_IP6_NF_IPTABLES) += ip6_tables.o
+obj-$(CONFIG_IP6_NF_FILTER) += ip6table_filter.o
+obj-$(CONFIG_IP6_NF_MANGLE) += ip6table_mangle.o
+obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
+obj-$(CONFIG_IP6_NF_SECURITY) += ip6table_security.o
+obj-$(CONFIG_IP6_NF_NAT) += ip6table_nat.o
+
+nf_nat_ipv6-y := nf_nat_l3proto_ipv6.o nf_nat_proto_icmpv6.o
+nf_nat_ipv6-$(CONFIG_NF_NAT_MASQUERADE_IPV6) += nf_nat_masquerade_ipv6.o
+obj-$(CONFIG_NF_NAT_IPV6) += nf_nat_ipv6.o
+
+# defrag
+nf_defrag_ipv6-y := nf_defrag_ipv6_hooks.o nf_conntrack_reasm.o
+obj-$(CONFIG_NF_DEFRAG_IPV6) += nf_defrag_ipv6.o
+
+obj-$(CONFIG_NF_SOCKET_IPV6) += nf_socket_ipv6.o
+obj-$(CONFIG_NF_TPROXY_IPV6) += nf_tproxy_ipv6.o
+
+# logging
+obj-$(CONFIG_NF_LOG_IPV6) += nf_log_ipv6.o
+
+# reject
+obj-$(CONFIG_NF_REJECT_IPV6) += nf_reject_ipv6.o
+
+obj-$(CONFIG_NF_DUP_IPV6) += nf_dup_ipv6.o
+
+# nf_tables
+obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV6) += nft_chain_route_ipv6.o
+obj-$(CONFIG_NFT_CHAIN_NAT_IPV6) += nft_chain_nat_ipv6.o
+obj-$(CONFIG_NFT_REJECT_IPV6) += nft_reject_ipv6.o
+obj-$(CONFIG_NFT_MASQ_IPV6) += nft_masq_ipv6.o
+obj-$(CONFIG_NFT_REDIR_IPV6) += nft_redir_ipv6.o
+obj-$(CONFIG_NFT_DUP_IPV6) += nft_dup_ipv6.o
+obj-$(CONFIG_NFT_FIB_IPV6) += nft_fib_ipv6.o
+
+# flow table support
+obj-$(CONFIG_NF_FLOW_TABLE_IPV6) += nf_flow_table_ipv6.o
+
+# matches
+obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
+obj-$(CONFIG_IP6_NF_MATCH_EUI64) += ip6t_eui64.o
+obj-$(CONFIG_IP6_NF_MATCH_FRAG) += ip6t_frag.o
+obj-$(CONFIG_IP6_NF_MATCH_IPV6HEADER) += ip6t_ipv6header.o
+obj-$(CONFIG_IP6_NF_MATCH_MH) += ip6t_mh.o
+obj-$(CONFIG_IP6_NF_MATCH_OPTS) += ip6t_hbh.o
+obj-$(CONFIG_IP6_NF_MATCH_RPFILTER) += ip6t_rpfilter.o
+obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o
+obj-$(CONFIG_IP6_NF_MATCH_SRH) += ip6t_srh.o
+
+# targets
+obj-$(CONFIG_IP6_NF_TARGET_MASQUERADE) += ip6t_MASQUERADE.o
+obj-$(CONFIG_IP6_NF_TARGET_NPT) += ip6t_NPT.o
+obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o
+obj-$(CONFIG_IP6_NF_TARGET_SYNPROXY) += ip6t_SYNPROXY.o
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
new file mode 100644
index 0000000..daf2e9e
--- /dev/null
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -0,0 +1,1978 @@
+/*
+ * Packet matching code.
+ *
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
+ * Copyright (c) 2006-2010 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/capability.h>
+#include <linux/in.h>
+#include <linux/skbuff.h>
+#include <linux/kmod.h>
+#include <linux/vmalloc.h>
+#include <linux/netdevice.h>
+#include <linux/module.h>
+#include <linux/poison.h>
+#include <linux/icmpv6.h>
+#include <net/ipv6.h>
+#include <net/compat.h>
+#include <linux/uaccess.h>
+#include <linux/mutex.h>
+#include <linux/proc_fs.h>
+#include <linux/err.h>
+#include <linux/cpumask.h>
+
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter/x_tables.h>
+#include <net/netfilter/nf_log.h>
+#include "../../netfilter/xt_repldata.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("IPv6 packet filter");
+MODULE_ALIAS("ip6t_icmp6");
+
+void *ip6t_alloc_initial_table(const struct xt_table *info)
+{
+ return xt_alloc_initial_table(ip6t, IP6T);
+}
+EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table);
+
+/* Returns whether matches rule or not. */
+/* Performance critical - called for every packet */
+static inline bool
+ip6_packet_match(const struct sk_buff *skb,
+ const char *indev,
+ const char *outdev,
+ const struct ip6t_ip6 *ip6info,
+ unsigned int *protoff,
+ int *fragoff, bool *hotdrop)
+{
+ unsigned long ret;
+ const struct ipv6hdr *ipv6 = ipv6_hdr(skb);
+
+ if (NF_INVF(ip6info, IP6T_INV_SRCIP,
+ ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk,
+ &ip6info->src)) ||
+ NF_INVF(ip6info, IP6T_INV_DSTIP,
+ ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
+ &ip6info->dst)))
+ return false;
+
+ ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
+
+ if (NF_INVF(ip6info, IP6T_INV_VIA_IN, ret != 0))
+ return false;
+
+ ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
+
+ if (NF_INVF(ip6info, IP6T_INV_VIA_OUT, ret != 0))
+ return false;
+
+/* ... might want to do something with class and flowlabel here ... */
+
+ /* look for the desired protocol header */
+ if (ip6info->flags & IP6T_F_PROTO) {
+ int protohdr;
+ unsigned short _frag_off;
+
+ protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL);
+ if (protohdr < 0) {
+ if (_frag_off == 0)
+ *hotdrop = true;
+ return false;
+ }
+ *fragoff = _frag_off;
+
+ if (ip6info->proto == protohdr) {
+ if (ip6info->invflags & IP6T_INV_PROTO)
+ return false;
+
+ return true;
+ }
+
+ /* We need match for the '-p all', too! */
+ if ((ip6info->proto != 0) &&
+ !(ip6info->invflags & IP6T_INV_PROTO))
+ return false;
+ }
+ return true;
+}
+
+/* should be ip6 safe */
+static bool
+ip6_checkentry(const struct ip6t_ip6 *ipv6)
+{
+ if (ipv6->flags & ~IP6T_F_MASK)
+ return false;
+ if (ipv6->invflags & ~IP6T_INV_MASK)
+ return false;
+
+ return true;
+}
+
+static unsigned int
+ip6t_error(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo);
+
+ return NF_DROP;
+}
+
+static inline struct ip6t_entry *
+get_entry(const void *base, unsigned int offset)
+{
+ return (struct ip6t_entry *)(base + offset);
+}
+
+/* All zeroes == unconditional rule. */
+/* Mildly perf critical (only if packet tracing is on) */
+static inline bool unconditional(const struct ip6t_entry *e)
+{
+ static const struct ip6t_ip6 uncond;
+
+ return e->target_offset == sizeof(struct ip6t_entry) &&
+ memcmp(&e->ipv6, &uncond, sizeof(uncond)) == 0;
+}
+
+static inline const struct xt_entry_target *
+ip6t_get_target_c(const struct ip6t_entry *e)
+{
+ return ip6t_get_target((struct ip6t_entry *)e);
+}
+
+#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
+/* This cries for unification! */
+static const char *const hooknames[] = {
+ [NF_INET_PRE_ROUTING] = "PREROUTING",
+ [NF_INET_LOCAL_IN] = "INPUT",
+ [NF_INET_FORWARD] = "FORWARD",
+ [NF_INET_LOCAL_OUT] = "OUTPUT",
+ [NF_INET_POST_ROUTING] = "POSTROUTING",
+};
+
+enum nf_ip_trace_comments {
+ NF_IP6_TRACE_COMMENT_RULE,
+ NF_IP6_TRACE_COMMENT_RETURN,
+ NF_IP6_TRACE_COMMENT_POLICY,
+};
+
+static const char *const comments[] = {
+ [NF_IP6_TRACE_COMMENT_RULE] = "rule",
+ [NF_IP6_TRACE_COMMENT_RETURN] = "return",
+ [NF_IP6_TRACE_COMMENT_POLICY] = "policy",
+};
+
+static const struct nf_loginfo trace_loginfo = {
+ .type = NF_LOG_TYPE_LOG,
+ .u = {
+ .log = {
+ .level = LOGLEVEL_WARNING,
+ .logflags = NF_LOG_DEFAULT_MASK,
+ },
+ },
+};
+
+/* Mildly perf critical (only if packet tracing is on) */
+static inline int
+get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e,
+ const char *hookname, const char **chainname,
+ const char **comment, unsigned int *rulenum)
+{
+ const struct xt_standard_target *t = (void *)ip6t_get_target_c(s);
+
+ if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) {
+ /* Head of user chain: ERROR target with chainname */
+ *chainname = t->target.data;
+ (*rulenum) = 0;
+ } else if (s == e) {
+ (*rulenum)++;
+
+ if (unconditional(s) &&
+ strcmp(t->target.u.kernel.target->name,
+ XT_STANDARD_TARGET) == 0 &&
+ t->verdict < 0) {
+ /* Tail of chains: STANDARD target (return/policy) */
+ *comment = *chainname == hookname
+ ? comments[NF_IP6_TRACE_COMMENT_POLICY]
+ : comments[NF_IP6_TRACE_COMMENT_RETURN];
+ }
+ return 1;
+ } else
+ (*rulenum)++;
+
+ return 0;
+}
+
+static void trace_packet(struct net *net,
+ const struct sk_buff *skb,
+ unsigned int hook,
+ const struct net_device *in,
+ const struct net_device *out,
+ const char *tablename,
+ const struct xt_table_info *private,
+ const struct ip6t_entry *e)
+{
+ const struct ip6t_entry *root;
+ const char *hookname, *chainname, *comment;
+ const struct ip6t_entry *iter;
+ unsigned int rulenum = 0;
+
+ root = get_entry(private->entries, private->hook_entry[hook]);
+
+ hookname = chainname = hooknames[hook];
+ comment = comments[NF_IP6_TRACE_COMMENT_RULE];
+
+ xt_entry_foreach(iter, root, private->size - private->hook_entry[hook])
+ if (get_chainname_rulenum(iter, e, hookname,
+ &chainname, &comment, &rulenum) != 0)
+ break;
+
+ nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo,
+ "TRACE: %s:%s:%s:%u ",
+ tablename, chainname, comment, rulenum);
+}
+#endif
+
+static inline struct ip6t_entry *
+ip6t_next_entry(const struct ip6t_entry *entry)
+{
+ return (void *)entry + entry->next_offset;
+}
+
+/* Returns one of the generic firewall policies, like NF_ACCEPT. */
+unsigned int
+ip6t_do_table(struct sk_buff *skb,
+ const struct nf_hook_state *state,
+ struct xt_table *table)
+{
+ unsigned int hook = state->hook;
+ static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
+ /* Initializing verdict to NF_DROP keeps gcc happy. */
+ unsigned int verdict = NF_DROP;
+ const char *indev, *outdev;
+ const void *table_base;
+ struct ip6t_entry *e, **jumpstack;
+ unsigned int stackidx, cpu;
+ const struct xt_table_info *private;
+ struct xt_action_param acpar;
+ unsigned int addend;
+
+ /* Initialization */
+ stackidx = 0;
+ indev = state->in ? state->in->name : nulldevname;
+ outdev = state->out ? state->out->name : nulldevname;
+ /* We handle fragments by dealing with the first fragment as
+ * if it was a normal packet. All other fragments are treated
+ * normally, except that they will NEVER match rules that ask
+ * things we don't know, ie. tcp syn flag or ports). If the
+ * rule is also a fragment-specific rule, non-fragments won't
+ * match it. */
+ acpar.hotdrop = false;
+ acpar.state = state;
+
+ WARN_ON(!(table->valid_hooks & (1 << hook)));
+
+ local_bh_disable();
+ addend = xt_write_recseq_begin();
+ private = READ_ONCE(table->private); /* Address dependency. */
+ cpu = smp_processor_id();
+ table_base = private->entries;
+ jumpstack = (struct ip6t_entry **)private->jumpstack[cpu];
+
+ /* Switch to alternate jumpstack if we're being invoked via TEE.
+ * TEE issues XT_CONTINUE verdict on original skb so we must not
+ * clobber the jumpstack.
+ *
+ * For recursion via REJECT or SYNPROXY the stack will be clobbered
+ * but it is no problem since absolute verdict is issued by these.
+ */
+ if (static_key_false(&xt_tee_enabled))
+ jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated);
+
+ e = get_entry(table_base, private->hook_entry[hook]);
+
+ do {
+ const struct xt_entry_target *t;
+ const struct xt_entry_match *ematch;
+ struct xt_counters *counter;
+
+ WARN_ON(!e);
+ acpar.thoff = 0;
+ if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,
+ &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) {
+ no_match:
+ e = ip6t_next_entry(e);
+ continue;
+ }
+
+ xt_ematch_foreach(ematch, e) {
+ acpar.match = ematch->u.kernel.match;
+ acpar.matchinfo = ematch->data;
+ if (!acpar.match->match(skb, &acpar))
+ goto no_match;
+ }
+
+ counter = xt_get_this_cpu_counter(&e->counters);
+ ADD_COUNTER(*counter, skb->len, 1);
+
+ t = ip6t_get_target_c(e);
+ WARN_ON(!t->u.kernel.target);
+
+#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
+ /* The packet is traced: log it */
+ if (unlikely(skb->nf_trace))
+ trace_packet(state->net, skb, hook, state->in,
+ state->out, table->name, private, e);
+#endif
+ /* Standard target? */
+ if (!t->u.kernel.target->target) {
+ int v;
+
+ v = ((struct xt_standard_target *)t)->verdict;
+ if (v < 0) {
+ /* Pop from stack? */
+ if (v != XT_RETURN) {
+ verdict = (unsigned int)(-v) - 1;
+ break;
+ }
+ if (stackidx == 0)
+ e = get_entry(table_base,
+ private->underflow[hook]);
+ else
+ e = ip6t_next_entry(jumpstack[--stackidx]);
+ continue;
+ }
+ if (table_base + v != ip6t_next_entry(e) &&
+ !(e->ipv6.flags & IP6T_F_GOTO)) {
+ if (unlikely(stackidx >= private->stacksize)) {
+ verdict = NF_DROP;
+ break;
+ }
+ jumpstack[stackidx++] = e;
+ }
+
+ e = get_entry(table_base, v);
+ continue;
+ }
+
+ acpar.target = t->u.kernel.target;
+ acpar.targinfo = t->data;
+
+ verdict = t->u.kernel.target->target(skb, &acpar);
+ if (verdict == XT_CONTINUE)
+ e = ip6t_next_entry(e);
+ else
+ /* Verdict */
+ break;
+ } while (!acpar.hotdrop);
+
+ xt_write_recseq_end(addend);
+ local_bh_enable();
+
+ if (acpar.hotdrop)
+ return NF_DROP;
+ else return verdict;
+}
+
+/* Figures out from what hook each rule can be called: returns 0 if
+ there are loops. Puts hook bitmask in comefrom. */
+static int
+mark_source_chains(const struct xt_table_info *newinfo,
+ unsigned int valid_hooks, void *entry0,
+ unsigned int *offsets)
+{
+ unsigned int hook;
+
+ /* No recursion; use packet counter to save back ptrs (reset
+ to 0 as we leave), and comefrom to save source hook bitmask */
+ for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
+ unsigned int pos = newinfo->hook_entry[hook];
+ struct ip6t_entry *e = entry0 + pos;
+
+ if (!(valid_hooks & (1 << hook)))
+ continue;
+
+ /* Set initial back pointer. */
+ e->counters.pcnt = pos;
+
+ for (;;) {
+ const struct xt_standard_target *t
+ = (void *)ip6t_get_target_c(e);
+ int visited = e->comefrom & (1 << hook);
+
+ if (e->comefrom & (1 << NF_INET_NUMHOOKS))
+ return 0;
+
+ e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
+
+ /* Unconditional return/END. */
+ if ((unconditional(e) &&
+ (strcmp(t->target.u.user.name,
+ XT_STANDARD_TARGET) == 0) &&
+ t->verdict < 0) || visited) {
+ unsigned int oldpos, size;
+
+ /* Return: backtrack through the last
+ big jump. */
+ do {
+ e->comefrom ^= (1<<NF_INET_NUMHOOKS);
+ oldpos = pos;
+ pos = e->counters.pcnt;
+ e->counters.pcnt = 0;
+
+ /* We're at the start. */
+ if (pos == oldpos)
+ goto next;
+
+ e = entry0 + pos;
+ } while (oldpos == pos + e->next_offset);
+
+ /* Move along one */
+ size = e->next_offset;
+ e = entry0 + pos + size;
+ if (pos + size >= newinfo->size)
+ return 0;
+ e->counters.pcnt = pos;
+ pos += size;
+ } else {
+ int newpos = t->verdict;
+
+ if (strcmp(t->target.u.user.name,
+ XT_STANDARD_TARGET) == 0 &&
+ newpos >= 0) {
+ /* This a jump; chase it. */
+ if (!xt_find_jump_offset(offsets, newpos,
+ newinfo->number))
+ return 0;
+ } else {
+ /* ... this is a fallthru */
+ newpos = pos + e->next_offset;
+ if (newpos >= newinfo->size)
+ return 0;
+ }
+ e = entry0 + newpos;
+ e->counters.pcnt = pos;
+ pos = newpos;
+ }
+ }
+next: ;
+ }
+ return 1;
+}
+
+static void cleanup_match(struct xt_entry_match *m, struct net *net)
+{
+ struct xt_mtdtor_param par;
+
+ par.net = net;
+ par.match = m->u.kernel.match;
+ par.matchinfo = m->data;
+ par.family = NFPROTO_IPV6;
+ if (par.match->destroy != NULL)
+ par.match->destroy(&par);
+ module_put(par.match->me);
+}
+
+static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
+{
+ const struct ip6t_ip6 *ipv6 = par->entryinfo;
+
+ par->match = m->u.kernel.match;
+ par->matchinfo = m->data;
+
+ return xt_check_match(par, m->u.match_size - sizeof(*m),
+ ipv6->proto, ipv6->invflags & IP6T_INV_PROTO);
+}
+
+static int
+find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
+{
+ struct xt_match *match;
+ int ret;
+
+ match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
+ m->u.user.revision);
+ if (IS_ERR(match))
+ return PTR_ERR(match);
+
+ m->u.kernel.match = match;
+
+ ret = check_match(m, par);
+ if (ret)
+ goto err;
+
+ return 0;
+err:
+ module_put(m->u.kernel.match->me);
+ return ret;
+}
+
+static int check_target(struct ip6t_entry *e, struct net *net, const char *name)
+{
+ struct xt_entry_target *t = ip6t_get_target(e);
+ struct xt_tgchk_param par = {
+ .net = net,
+ .table = name,
+ .entryinfo = e,
+ .target = t->u.kernel.target,
+ .targinfo = t->data,
+ .hook_mask = e->comefrom,
+ .family = NFPROTO_IPV6,
+ };
+
+ return xt_check_target(&par, t->u.target_size - sizeof(*t),
+ e->ipv6.proto,
+ e->ipv6.invflags & IP6T_INV_PROTO);
+}
+
+static int
+find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
+ unsigned int size,
+ struct xt_percpu_counter_alloc_state *alloc_state)
+{
+ struct xt_entry_target *t;
+ struct xt_target *target;
+ int ret;
+ unsigned int j;
+ struct xt_mtchk_param mtpar;
+ struct xt_entry_match *ematch;
+
+ if (!xt_percpu_counter_alloc(alloc_state, &e->counters))
+ return -ENOMEM;
+
+ j = 0;
+ memset(&mtpar, 0, sizeof(mtpar));
+ mtpar.net = net;
+ mtpar.table = name;
+ mtpar.entryinfo = &e->ipv6;
+ mtpar.hook_mask = e->comefrom;
+ mtpar.family = NFPROTO_IPV6;
+ xt_ematch_foreach(ematch, e) {
+ ret = find_check_match(ematch, &mtpar);
+ if (ret != 0)
+ goto cleanup_matches;
+ ++j;
+ }
+
+ t = ip6t_get_target(e);
+ target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
+ t->u.user.revision);
+ if (IS_ERR(target)) {
+ ret = PTR_ERR(target);
+ goto cleanup_matches;
+ }
+ t->u.kernel.target = target;
+
+ ret = check_target(e, net, name);
+ if (ret)
+ goto err;
+ return 0;
+ err:
+ module_put(t->u.kernel.target->me);
+ cleanup_matches:
+ xt_ematch_foreach(ematch, e) {
+ if (j-- == 0)
+ break;
+ cleanup_match(ematch, net);
+ }
+
+ xt_percpu_counter_free(&e->counters);
+
+ return ret;
+}
+
+static bool check_underflow(const struct ip6t_entry *e)
+{
+ const struct xt_entry_target *t;
+ unsigned int verdict;
+
+ if (!unconditional(e))
+ return false;
+ t = ip6t_get_target_c(e);
+ if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
+ return false;
+ verdict = ((struct xt_standard_target *)t)->verdict;
+ verdict = -verdict - 1;
+ return verdict == NF_DROP || verdict == NF_ACCEPT;
+}
+
+static int
+check_entry_size_and_hooks(struct ip6t_entry *e,
+ struct xt_table_info *newinfo,
+ const unsigned char *base,
+ const unsigned char *limit,
+ const unsigned int *hook_entries,
+ const unsigned int *underflows,
+ unsigned int valid_hooks)
+{
+ unsigned int h;
+ int err;
+
+ if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
+ (unsigned char *)e + sizeof(struct ip6t_entry) >= limit ||
+ (unsigned char *)e + e->next_offset > limit)
+ return -EINVAL;
+
+ if (e->next_offset
+ < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target))
+ return -EINVAL;
+
+ if (!ip6_checkentry(&e->ipv6))
+ return -EINVAL;
+
+ err = xt_check_entry_offsets(e, e->elems, e->target_offset,
+ e->next_offset);
+ if (err)
+ return err;
+
+ /* Check hooks & underflows */
+ for (h = 0; h < NF_INET_NUMHOOKS; h++) {
+ if (!(valid_hooks & (1 << h)))
+ continue;
+ if ((unsigned char *)e - base == hook_entries[h])
+ newinfo->hook_entry[h] = hook_entries[h];
+ if ((unsigned char *)e - base == underflows[h]) {
+ if (!check_underflow(e))
+ return -EINVAL;
+
+ newinfo->underflow[h] = underflows[h];
+ }
+ }
+
+ /* Clear counters and comefrom */
+ e->counters = ((struct xt_counters) { 0, 0 });
+ e->comefrom = 0;
+ return 0;
+}
+
+static void cleanup_entry(struct ip6t_entry *e, struct net *net)
+{
+ struct xt_tgdtor_param par;
+ struct xt_entry_target *t;
+ struct xt_entry_match *ematch;
+
+ /* Cleanup all matches */
+ xt_ematch_foreach(ematch, e)
+ cleanup_match(ematch, net);
+ t = ip6t_get_target(e);
+
+ par.net = net;
+ par.target = t->u.kernel.target;
+ par.targinfo = t->data;
+ par.family = NFPROTO_IPV6;
+ if (par.target->destroy != NULL)
+ par.target->destroy(&par);
+ module_put(par.target->me);
+ xt_percpu_counter_free(&e->counters);
+}
+
+/* Checks and translates the user-supplied table segment (held in
+ newinfo) */
+static int
+translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
+ const struct ip6t_replace *repl)
+{
+ struct xt_percpu_counter_alloc_state alloc_state = { 0 };
+ struct ip6t_entry *iter;
+ unsigned int *offsets;
+ unsigned int i;
+ int ret = 0;
+
+ newinfo->size = repl->size;
+ newinfo->number = repl->num_entries;
+
+ /* Init all hooks to impossible value. */
+ for (i = 0; i < NF_INET_NUMHOOKS; i++) {
+ newinfo->hook_entry[i] = 0xFFFFFFFF;
+ newinfo->underflow[i] = 0xFFFFFFFF;
+ }
+
+ offsets = xt_alloc_entry_offsets(newinfo->number);
+ if (!offsets)
+ return -ENOMEM;
+ i = 0;
+ /* Walk through entries, checking offsets. */
+ xt_entry_foreach(iter, entry0, newinfo->size) {
+ ret = check_entry_size_and_hooks(iter, newinfo, entry0,
+ entry0 + repl->size,
+ repl->hook_entry,
+ repl->underflow,
+ repl->valid_hooks);
+ if (ret != 0)
+ goto out_free;
+ if (i < repl->num_entries)
+ offsets[i] = (void *)iter - entry0;
+ ++i;
+ if (strcmp(ip6t_get_target(iter)->u.user.name,
+ XT_ERROR_TARGET) == 0)
+ ++newinfo->stacksize;
+ }
+
+ ret = -EINVAL;
+ if (i != repl->num_entries)
+ goto out_free;
+
+ ret = xt_check_table_hooks(newinfo, repl->valid_hooks);
+ if (ret)
+ goto out_free;
+
+ if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) {
+ ret = -ELOOP;
+ goto out_free;
+ }
+ kvfree(offsets);
+
+ /* Finally, each sanity check must pass */
+ i = 0;
+ xt_entry_foreach(iter, entry0, newinfo->size) {
+ ret = find_check_entry(iter, net, repl->name, repl->size,
+ &alloc_state);
+ if (ret != 0)
+ break;
+ ++i;
+ }
+
+ if (ret != 0) {
+ xt_entry_foreach(iter, entry0, newinfo->size) {
+ if (i-- == 0)
+ break;
+ cleanup_entry(iter, net);
+ }
+ return ret;
+ }
+
+ return ret;
+ out_free:
+ kvfree(offsets);
+ return ret;
+}
+
+static void
+get_counters(const struct xt_table_info *t,
+ struct xt_counters counters[])
+{
+ struct ip6t_entry *iter;
+ unsigned int cpu;
+ unsigned int i;
+
+ for_each_possible_cpu(cpu) {
+ seqcount_t *s = &per_cpu(xt_recseq, cpu);
+
+ i = 0;
+ xt_entry_foreach(iter, t->entries, t->size) {
+ struct xt_counters *tmp;
+ u64 bcnt, pcnt;
+ unsigned int start;
+
+ tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
+ do {
+ start = read_seqcount_begin(s);
+ bcnt = tmp->bcnt;
+ pcnt = tmp->pcnt;
+ } while (read_seqcount_retry(s, start));
+
+ ADD_COUNTER(counters[i], bcnt, pcnt);
+ ++i;
+ cond_resched();
+ }
+ }
+}
+
+static void get_old_counters(const struct xt_table_info *t,
+ struct xt_counters counters[])
+{
+ struct ip6t_entry *iter;
+ unsigned int cpu, i;
+
+ for_each_possible_cpu(cpu) {
+ i = 0;
+ xt_entry_foreach(iter, t->entries, t->size) {
+ const struct xt_counters *tmp;
+
+ tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
+ ADD_COUNTER(counters[i], tmp->bcnt, tmp->pcnt);
+ ++i;
+ }
+ cond_resched();
+ }
+}
+
+static struct xt_counters *alloc_counters(const struct xt_table *table)
+{
+ unsigned int countersize;
+ struct xt_counters *counters;
+ const struct xt_table_info *private = table->private;
+
+ /* We need atomic snapshot of counters: rest doesn't change
+ (other than comefrom, which userspace doesn't care
+ about). */
+ countersize = sizeof(struct xt_counters) * private->number;
+ counters = vzalloc(countersize);
+
+ if (counters == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ get_counters(private, counters);
+
+ return counters;
+}
+
+static int
+copy_entries_to_user(unsigned int total_size,
+ const struct xt_table *table,
+ void __user *userptr)
+{
+ unsigned int off, num;
+ const struct ip6t_entry *e;
+ struct xt_counters *counters;
+ const struct xt_table_info *private = table->private;
+ int ret = 0;
+ const void *loc_cpu_entry;
+
+ counters = alloc_counters(table);
+ if (IS_ERR(counters))
+ return PTR_ERR(counters);
+
+ loc_cpu_entry = private->entries;
+
+ /* FIXME: use iterator macros --RR */
+ /* ... then go back and fix counters and names */
+ for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
+ unsigned int i;
+ const struct xt_entry_match *m;
+ const struct xt_entry_target *t;
+
+ e = loc_cpu_entry + off;
+ if (copy_to_user(userptr + off, e, sizeof(*e))) {
+ ret = -EFAULT;
+ goto free_counters;
+ }
+ if (copy_to_user(userptr + off
+ + offsetof(struct ip6t_entry, counters),
+ &counters[num],
+ sizeof(counters[num])) != 0) {
+ ret = -EFAULT;
+ goto free_counters;
+ }
+
+ for (i = sizeof(struct ip6t_entry);
+ i < e->target_offset;
+ i += m->u.match_size) {
+ m = (void *)e + i;
+
+ if (xt_match_to_user(m, userptr + off + i)) {
+ ret = -EFAULT;
+ goto free_counters;
+ }
+ }
+
+ t = ip6t_get_target_c(e);
+ if (xt_target_to_user(t, userptr + off + e->target_offset)) {
+ ret = -EFAULT;
+ goto free_counters;
+ }
+ }
+
+ free_counters:
+ vfree(counters);
+ return ret;
+}
+
+#ifdef CONFIG_COMPAT
+static void compat_standard_from_user(void *dst, const void *src)
+{
+ int v = *(compat_int_t *)src;
+
+ if (v > 0)
+ v += xt_compat_calc_jump(AF_INET6, v);
+ memcpy(dst, &v, sizeof(v));
+}
+
+static int compat_standard_to_user(void __user *dst, const void *src)
+{
+ compat_int_t cv = *(int *)src;
+
+ if (cv > 0)
+ cv -= xt_compat_calc_jump(AF_INET6, cv);
+ return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
+}
+
+static int compat_calc_entry(const struct ip6t_entry *e,
+ const struct xt_table_info *info,
+ const void *base, struct xt_table_info *newinfo)
+{
+ const struct xt_entry_match *ematch;
+ const struct xt_entry_target *t;
+ unsigned int entry_offset;
+ int off, i, ret;
+
+ off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
+ entry_offset = (void *)e - base;
+ xt_ematch_foreach(ematch, e)
+ off += xt_compat_match_offset(ematch->u.kernel.match);
+ t = ip6t_get_target_c(e);
+ off += xt_compat_target_offset(t->u.kernel.target);
+ newinfo->size -= off;
+ ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < NF_INET_NUMHOOKS; i++) {
+ if (info->hook_entry[i] &&
+ (e < (struct ip6t_entry *)(base + info->hook_entry[i])))
+ newinfo->hook_entry[i] -= off;
+ if (info->underflow[i] &&
+ (e < (struct ip6t_entry *)(base + info->underflow[i])))
+ newinfo->underflow[i] -= off;
+ }
+ return 0;
+}
+
+static int compat_table_info(const struct xt_table_info *info,
+ struct xt_table_info *newinfo)
+{
+ struct ip6t_entry *iter;
+ const void *loc_cpu_entry;
+ int ret;
+
+ if (!newinfo || !info)
+ return -EINVAL;
+
+ /* we dont care about newinfo->entries */
+ memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
+ newinfo->initial_entries = 0;
+ loc_cpu_entry = info->entries;
+ ret = xt_compat_init_offsets(AF_INET6, info->number);
+ if (ret)
+ return ret;
+ xt_entry_foreach(iter, loc_cpu_entry, info->size) {
+ ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
+ if (ret != 0)
+ return ret;
+ }
+ return 0;
+}
+#endif
+
+static int get_info(struct net *net, void __user *user,
+ const int *len, int compat)
+{
+ char name[XT_TABLE_MAXNAMELEN];
+ struct xt_table *t;
+ int ret;
+
+ if (*len != sizeof(struct ip6t_getinfo))
+ return -EINVAL;
+
+ if (copy_from_user(name, user, sizeof(name)) != 0)
+ return -EFAULT;
+
+ name[XT_TABLE_MAXNAMELEN-1] = '\0';
+#ifdef CONFIG_COMPAT
+ if (compat)
+ xt_compat_lock(AF_INET6);
+#endif
+ t = xt_request_find_table_lock(net, AF_INET6, name);
+ if (!IS_ERR(t)) {
+ struct ip6t_getinfo info;
+ const struct xt_table_info *private = t->private;
+#ifdef CONFIG_COMPAT
+ struct xt_table_info tmp;
+
+ if (compat) {
+ ret = compat_table_info(private, &tmp);
+ xt_compat_flush_offsets(AF_INET6);
+ private = &tmp;
+ }
+#endif
+ memset(&info, 0, sizeof(info));
+ info.valid_hooks = t->valid_hooks;
+ memcpy(info.hook_entry, private->hook_entry,
+ sizeof(info.hook_entry));
+ memcpy(info.underflow, private->underflow,
+ sizeof(info.underflow));
+ info.num_entries = private->number;
+ info.size = private->size;
+ strcpy(info.name, name);
+
+ if (copy_to_user(user, &info, *len) != 0)
+ ret = -EFAULT;
+ else
+ ret = 0;
+
+ xt_table_unlock(t);
+ module_put(t->me);
+ } else
+ ret = PTR_ERR(t);
+#ifdef CONFIG_COMPAT
+ if (compat)
+ xt_compat_unlock(AF_INET6);
+#endif
+ return ret;
+}
+
+static int
+get_entries(struct net *net, struct ip6t_get_entries __user *uptr,
+ const int *len)
+{
+ int ret;
+ struct ip6t_get_entries get;
+ struct xt_table *t;
+
+ if (*len < sizeof(get))
+ return -EINVAL;
+ if (copy_from_user(&get, uptr, sizeof(get)) != 0)
+ return -EFAULT;
+ if (*len != sizeof(struct ip6t_get_entries) + get.size)
+ return -EINVAL;
+
+ get.name[sizeof(get.name) - 1] = '\0';
+
+ t = xt_find_table_lock(net, AF_INET6, get.name);
+ if (!IS_ERR(t)) {
+ struct xt_table_info *private = t->private;
+ if (get.size == private->size)
+ ret = copy_entries_to_user(private->size,
+ t, uptr->entrytable);
+ else
+ ret = -EAGAIN;
+
+ module_put(t->me);
+ xt_table_unlock(t);
+ } else
+ ret = PTR_ERR(t);
+
+ return ret;
+}
+
+static int
+__do_replace(struct net *net, const char *name, unsigned int valid_hooks,
+ struct xt_table_info *newinfo, unsigned int num_counters,
+ void __user *counters_ptr)
+{
+ int ret;
+ struct xt_table *t;
+ struct xt_table_info *oldinfo;
+ struct xt_counters *counters;
+ struct ip6t_entry *iter;
+
+ ret = 0;
+ counters = xt_counters_alloc(num_counters);
+ if (!counters) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ t = xt_request_find_table_lock(net, AF_INET6, name);
+ if (IS_ERR(t)) {
+ ret = PTR_ERR(t);
+ goto free_newinfo_counters_untrans;
+ }
+
+ /* You lied! */
+ if (valid_hooks != t->valid_hooks) {
+ ret = -EINVAL;
+ goto put_module;
+ }
+
+ oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
+ if (!oldinfo)
+ goto put_module;
+
+ /* Update module usage count based on number of rules */
+ if ((oldinfo->number > oldinfo->initial_entries) ||
+ (newinfo->number <= oldinfo->initial_entries))
+ module_put(t->me);
+ if ((oldinfo->number > oldinfo->initial_entries) &&
+ (newinfo->number <= oldinfo->initial_entries))
+ module_put(t->me);
+
+ xt_table_unlock(t);
+
+ get_old_counters(oldinfo, counters);
+
+ /* Decrease module usage counts and free resource */
+ xt_entry_foreach(iter, oldinfo->entries, oldinfo->size)
+ cleanup_entry(iter, net);
+
+ xt_free_table_info(oldinfo);
+ if (copy_to_user(counters_ptr, counters,
+ sizeof(struct xt_counters) * num_counters) != 0) {
+ /* Silent error, can't fail, new table is already in place */
+ net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n");
+ }
+ vfree(counters);
+ return ret;
+
+ put_module:
+ module_put(t->me);
+ xt_table_unlock(t);
+ free_newinfo_counters_untrans:
+ vfree(counters);
+ out:
+ return ret;
+}
+
+static int
+do_replace(struct net *net, const void __user *user, unsigned int len)
+{
+ int ret;
+ struct ip6t_replace tmp;
+ struct xt_table_info *newinfo;
+ void *loc_cpu_entry;
+ struct ip6t_entry *iter;
+
+ if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+ return -EFAULT;
+
+ /* overflow check */
+ if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
+ return -ENOMEM;
+ if (tmp.num_counters == 0)
+ return -EINVAL;
+
+ tmp.name[sizeof(tmp.name)-1] = 0;
+
+ newinfo = xt_alloc_table_info(tmp.size);
+ if (!newinfo)
+ return -ENOMEM;
+
+ loc_cpu_entry = newinfo->entries;
+ if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
+ tmp.size) != 0) {
+ ret = -EFAULT;
+ goto free_newinfo;
+ }
+
+ ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
+ if (ret != 0)
+ goto free_newinfo;
+
+ ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
+ tmp.num_counters, tmp.counters);
+ if (ret)
+ goto free_newinfo_untrans;
+ return 0;
+
+ free_newinfo_untrans:
+ xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
+ cleanup_entry(iter, net);
+ free_newinfo:
+ xt_free_table_info(newinfo);
+ return ret;
+}
+
+static int
+do_add_counters(struct net *net, const void __user *user, unsigned int len,
+ int compat)
+{
+ unsigned int i;
+ struct xt_counters_info tmp;
+ struct xt_counters *paddc;
+ struct xt_table *t;
+ const struct xt_table_info *private;
+ int ret = 0;
+ struct ip6t_entry *iter;
+ unsigned int addend;
+
+ paddc = xt_copy_counters_from_user(user, len, &tmp, compat);
+ if (IS_ERR(paddc))
+ return PTR_ERR(paddc);
+ t = xt_find_table_lock(net, AF_INET6, tmp.name);
+ if (IS_ERR(t)) {
+ ret = PTR_ERR(t);
+ goto free;
+ }
+
+ local_bh_disable();
+ private = t->private;
+ if (private->number != tmp.num_counters) {
+ ret = -EINVAL;
+ goto unlock_up_free;
+ }
+
+ i = 0;
+ addend = xt_write_recseq_begin();
+ xt_entry_foreach(iter, private->entries, private->size) {
+ struct xt_counters *tmp;
+
+ tmp = xt_get_this_cpu_counter(&iter->counters);
+ ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt);
+ ++i;
+ }
+ xt_write_recseq_end(addend);
+ unlock_up_free:
+ local_bh_enable();
+ xt_table_unlock(t);
+ module_put(t->me);
+ free:
+ vfree(paddc);
+
+ return ret;
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_ip6t_replace {
+ char name[XT_TABLE_MAXNAMELEN];
+ u32 valid_hooks;
+ u32 num_entries;
+ u32 size;
+ u32 hook_entry[NF_INET_NUMHOOKS];
+ u32 underflow[NF_INET_NUMHOOKS];
+ u32 num_counters;
+ compat_uptr_t counters; /* struct xt_counters * */
+ struct compat_ip6t_entry entries[0];
+};
+
+static int
+compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
+ unsigned int *size, struct xt_counters *counters,
+ unsigned int i)
+{
+ struct xt_entry_target *t;
+ struct compat_ip6t_entry __user *ce;
+ u_int16_t target_offset, next_offset;
+ compat_uint_t origsize;
+ const struct xt_entry_match *ematch;
+ int ret = 0;
+
+ origsize = *size;
+ ce = *dstptr;
+ if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 ||
+ copy_to_user(&ce->counters, &counters[i],
+ sizeof(counters[i])) != 0)
+ return -EFAULT;
+
+ *dstptr += sizeof(struct compat_ip6t_entry);
+ *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
+
+ xt_ematch_foreach(ematch, e) {
+ ret = xt_compat_match_to_user(ematch, dstptr, size);
+ if (ret != 0)
+ return ret;
+ }
+ target_offset = e->target_offset - (origsize - *size);
+ t = ip6t_get_target(e);
+ ret = xt_compat_target_to_user(t, dstptr, size);
+ if (ret)
+ return ret;
+ next_offset = e->next_offset - (origsize - *size);
+ if (put_user(target_offset, &ce->target_offset) != 0 ||
+ put_user(next_offset, &ce->next_offset) != 0)
+ return -EFAULT;
+ return 0;
+}
+
+static int
+compat_find_calc_match(struct xt_entry_match *m,
+ const struct ip6t_ip6 *ipv6,
+ int *size)
+{
+ struct xt_match *match;
+
+ match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
+ m->u.user.revision);
+ if (IS_ERR(match))
+ return PTR_ERR(match);
+
+ m->u.kernel.match = match;
+ *size += xt_compat_match_offset(match);
+ return 0;
+}
+
+static void compat_release_entry(struct compat_ip6t_entry *e)
+{
+ struct xt_entry_target *t;
+ struct xt_entry_match *ematch;
+
+ /* Cleanup all matches */
+ xt_ematch_foreach(ematch, e)
+ module_put(ematch->u.kernel.match->me);
+ t = compat_ip6t_get_target(e);
+ module_put(t->u.kernel.target->me);
+}
+
+static int
+check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
+ struct xt_table_info *newinfo,
+ unsigned int *size,
+ const unsigned char *base,
+ const unsigned char *limit)
+{
+ struct xt_entry_match *ematch;
+ struct xt_entry_target *t;
+ struct xt_target *target;
+ unsigned int entry_offset;
+ unsigned int j;
+ int ret, off;
+
+ if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
+ (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit ||
+ (unsigned char *)e + e->next_offset > limit)
+ return -EINVAL;
+
+ if (e->next_offset < sizeof(struct compat_ip6t_entry) +
+ sizeof(struct compat_xt_entry_target))
+ return -EINVAL;
+
+ if (!ip6_checkentry(&e->ipv6))
+ return -EINVAL;
+
+ ret = xt_compat_check_entry_offsets(e, e->elems,
+ e->target_offset, e->next_offset);
+ if (ret)
+ return ret;
+
+ off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
+ entry_offset = (void *)e - (void *)base;
+ j = 0;
+ xt_ematch_foreach(ematch, e) {
+ ret = compat_find_calc_match(ematch, &e->ipv6, &off);
+ if (ret != 0)
+ goto release_matches;
+ ++j;
+ }
+
+ t = compat_ip6t_get_target(e);
+ target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
+ t->u.user.revision);
+ if (IS_ERR(target)) {
+ ret = PTR_ERR(target);
+ goto release_matches;
+ }
+ t->u.kernel.target = target;
+
+ off += xt_compat_target_offset(target);
+ *size += off;
+ ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
+ if (ret)
+ goto out;
+
+ return 0;
+
+out:
+ module_put(t->u.kernel.target->me);
+release_matches:
+ xt_ematch_foreach(ematch, e) {
+ if (j-- == 0)
+ break;
+ module_put(ematch->u.kernel.match->me);
+ }
+ return ret;
+}
+
+static void
+compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
+ unsigned int *size,
+ struct xt_table_info *newinfo, unsigned char *base)
+{
+ struct xt_entry_target *t;
+ struct ip6t_entry *de;
+ unsigned int origsize;
+ int h;
+ struct xt_entry_match *ematch;
+
+ origsize = *size;
+ de = *dstptr;
+ memcpy(de, e, sizeof(struct ip6t_entry));
+ memcpy(&de->counters, &e->counters, sizeof(e->counters));
+
+ *dstptr += sizeof(struct ip6t_entry);
+ *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
+
+ xt_ematch_foreach(ematch, e)
+ xt_compat_match_from_user(ematch, dstptr, size);
+
+ de->target_offset = e->target_offset - (origsize - *size);
+ t = compat_ip6t_get_target(e);
+ xt_compat_target_from_user(t, dstptr, size);
+
+ de->next_offset = e->next_offset - (origsize - *size);
+ for (h = 0; h < NF_INET_NUMHOOKS; h++) {
+ if ((unsigned char *)de - base < newinfo->hook_entry[h])
+ newinfo->hook_entry[h] -= origsize - *size;
+ if ((unsigned char *)de - base < newinfo->underflow[h])
+ newinfo->underflow[h] -= origsize - *size;
+ }
+}
+
+static int
+translate_compat_table(struct net *net,
+ struct xt_table_info **pinfo,
+ void **pentry0,
+ const struct compat_ip6t_replace *compatr)
+{
+ unsigned int i, j;
+ struct xt_table_info *newinfo, *info;
+ void *pos, *entry0, *entry1;
+ struct compat_ip6t_entry *iter0;
+ struct ip6t_replace repl;
+ unsigned int size;
+ int ret;
+
+ info = *pinfo;
+ entry0 = *pentry0;
+ size = compatr->size;
+ info->number = compatr->num_entries;
+
+ j = 0;
+ xt_compat_lock(AF_INET6);
+ ret = xt_compat_init_offsets(AF_INET6, compatr->num_entries);
+ if (ret)
+ goto out_unlock;
+ /* Walk through entries, checking offsets. */
+ xt_entry_foreach(iter0, entry0, compatr->size) {
+ ret = check_compat_entry_size_and_hooks(iter0, info, &size,
+ entry0,
+ entry0 + compatr->size);
+ if (ret != 0)
+ goto out_unlock;
+ ++j;
+ }
+
+ ret = -EINVAL;
+ if (j != compatr->num_entries)
+ goto out_unlock;
+
+ ret = -ENOMEM;
+ newinfo = xt_alloc_table_info(size);
+ if (!newinfo)
+ goto out_unlock;
+
+ newinfo->number = compatr->num_entries;
+ for (i = 0; i < NF_INET_NUMHOOKS; i++) {
+ newinfo->hook_entry[i] = compatr->hook_entry[i];
+ newinfo->underflow[i] = compatr->underflow[i];
+ }
+ entry1 = newinfo->entries;
+ pos = entry1;
+ size = compatr->size;
+ xt_entry_foreach(iter0, entry0, compatr->size)
+ compat_copy_entry_from_user(iter0, &pos, &size,
+ newinfo, entry1);
+
+ /* all module references in entry0 are now gone. */
+ xt_compat_flush_offsets(AF_INET6);
+ xt_compat_unlock(AF_INET6);
+
+ memcpy(&repl, compatr, sizeof(*compatr));
+
+ for (i = 0; i < NF_INET_NUMHOOKS; i++) {
+ repl.hook_entry[i] = newinfo->hook_entry[i];
+ repl.underflow[i] = newinfo->underflow[i];
+ }
+
+ repl.num_counters = 0;
+ repl.counters = NULL;
+ repl.size = newinfo->size;
+ ret = translate_table(net, newinfo, entry1, &repl);
+ if (ret)
+ goto free_newinfo;
+
+ *pinfo = newinfo;
+ *pentry0 = entry1;
+ xt_free_table_info(info);
+ return 0;
+
+free_newinfo:
+ xt_free_table_info(newinfo);
+ return ret;
+out_unlock:
+ xt_compat_flush_offsets(AF_INET6);
+ xt_compat_unlock(AF_INET6);
+ xt_entry_foreach(iter0, entry0, compatr->size) {
+ if (j-- == 0)
+ break;
+ compat_release_entry(iter0);
+ }
+ return ret;
+}
+
+static int
+compat_do_replace(struct net *net, void __user *user, unsigned int len)
+{
+ int ret;
+ struct compat_ip6t_replace tmp;
+ struct xt_table_info *newinfo;
+ void *loc_cpu_entry;
+ struct ip6t_entry *iter;
+
+ if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+ return -EFAULT;
+
+ /* overflow check */
+ if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
+ return -ENOMEM;
+ if (tmp.num_counters == 0)
+ return -EINVAL;
+
+ tmp.name[sizeof(tmp.name)-1] = 0;
+
+ newinfo = xt_alloc_table_info(tmp.size);
+ if (!newinfo)
+ return -ENOMEM;
+
+ loc_cpu_entry = newinfo->entries;
+ if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
+ tmp.size) != 0) {
+ ret = -EFAULT;
+ goto free_newinfo;
+ }
+
+ ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp);
+ if (ret != 0)
+ goto free_newinfo;
+
+ ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
+ tmp.num_counters, compat_ptr(tmp.counters));
+ if (ret)
+ goto free_newinfo_untrans;
+ return 0;
+
+ free_newinfo_untrans:
+ xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
+ cleanup_entry(iter, net);
+ free_newinfo:
+ xt_free_table_info(newinfo);
+ return ret;
+}
+
+static int
+compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
+ unsigned int len)
+{
+ int ret;
+
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ switch (cmd) {
+ case IP6T_SO_SET_REPLACE:
+ ret = compat_do_replace(sock_net(sk), user, len);
+ break;
+
+ case IP6T_SO_SET_ADD_COUNTERS:
+ ret = do_add_counters(sock_net(sk), user, len, 1);
+ break;
+
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+struct compat_ip6t_get_entries {
+ char name[XT_TABLE_MAXNAMELEN];
+ compat_uint_t size;
+ struct compat_ip6t_entry entrytable[0];
+};
+
+static int
+compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
+ void __user *userptr)
+{
+ struct xt_counters *counters;
+ const struct xt_table_info *private = table->private;
+ void __user *pos;
+ unsigned int size;
+ int ret = 0;
+ unsigned int i = 0;
+ struct ip6t_entry *iter;
+
+ counters = alloc_counters(table);
+ if (IS_ERR(counters))
+ return PTR_ERR(counters);
+
+ pos = userptr;
+ size = total_size;
+ xt_entry_foreach(iter, private->entries, total_size) {
+ ret = compat_copy_entry_to_user(iter, &pos,
+ &size, counters, i++);
+ if (ret != 0)
+ break;
+ }
+
+ vfree(counters);
+ return ret;
+}
+
+static int
+compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
+ int *len)
+{
+ int ret;
+ struct compat_ip6t_get_entries get;
+ struct xt_table *t;
+
+ if (*len < sizeof(get))
+ return -EINVAL;
+
+ if (copy_from_user(&get, uptr, sizeof(get)) != 0)
+ return -EFAULT;
+
+ if (*len != sizeof(struct compat_ip6t_get_entries) + get.size)
+ return -EINVAL;
+
+ get.name[sizeof(get.name) - 1] = '\0';
+
+ xt_compat_lock(AF_INET6);
+ t = xt_find_table_lock(net, AF_INET6, get.name);
+ if (!IS_ERR(t)) {
+ const struct xt_table_info *private = t->private;
+ struct xt_table_info info;
+ ret = compat_table_info(private, &info);
+ if (!ret && get.size == info.size)
+ ret = compat_copy_entries_to_user(private->size,
+ t, uptr->entrytable);
+ else if (!ret)
+ ret = -EAGAIN;
+
+ xt_compat_flush_offsets(AF_INET6);
+ module_put(t->me);
+ xt_table_unlock(t);
+ } else
+ ret = PTR_ERR(t);
+
+ xt_compat_unlock(AF_INET6);
+ return ret;
+}
+
+static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *);
+
+static int
+compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
+{
+ int ret;
+
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ switch (cmd) {
+ case IP6T_SO_GET_INFO:
+ ret = get_info(sock_net(sk), user, len, 1);
+ break;
+ case IP6T_SO_GET_ENTRIES:
+ ret = compat_get_entries(sock_net(sk), user, len);
+ break;
+ default:
+ ret = do_ip6t_get_ctl(sk, cmd, user, len);
+ }
+ return ret;
+}
+#endif
+
+static int
+do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+{
+ int ret;
+
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ switch (cmd) {
+ case IP6T_SO_SET_REPLACE:
+ ret = do_replace(sock_net(sk), user, len);
+ break;
+
+ case IP6T_SO_SET_ADD_COUNTERS:
+ ret = do_add_counters(sock_net(sk), user, len, 0);
+ break;
+
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static int
+do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
+{
+ int ret;
+
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ switch (cmd) {
+ case IP6T_SO_GET_INFO:
+ ret = get_info(sock_net(sk), user, len, 0);
+ break;
+
+ case IP6T_SO_GET_ENTRIES:
+ ret = get_entries(sock_net(sk), user, len);
+ break;
+
+ case IP6T_SO_GET_REVISION_MATCH:
+ case IP6T_SO_GET_REVISION_TARGET: {
+ struct xt_get_revision rev;
+ int target;
+
+ if (*len != sizeof(rev)) {
+ ret = -EINVAL;
+ break;
+ }
+ if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
+ ret = -EFAULT;
+ break;
+ }
+ rev.name[sizeof(rev.name)-1] = 0;
+
+ if (cmd == IP6T_SO_GET_REVISION_TARGET)
+ target = 1;
+ else
+ target = 0;
+
+ try_then_request_module(xt_find_revision(AF_INET6, rev.name,
+ rev.revision,
+ target, &ret),
+ "ip6t_%s", rev.name);
+ break;
+ }
+
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static void __ip6t_unregister_table(struct net *net, struct xt_table *table)
+{
+ struct xt_table_info *private;
+ void *loc_cpu_entry;
+ struct module *table_owner = table->me;
+ struct ip6t_entry *iter;
+
+ private = xt_unregister_table(table);
+
+ /* Decrease module usage counts and free resources */
+ loc_cpu_entry = private->entries;
+ xt_entry_foreach(iter, loc_cpu_entry, private->size)
+ cleanup_entry(iter, net);
+ if (private->number > private->initial_entries)
+ module_put(table_owner);
+ xt_free_table_info(private);
+}
+
+int ip6t_register_table(struct net *net, const struct xt_table *table,
+ const struct ip6t_replace *repl,
+ const struct nf_hook_ops *ops,
+ struct xt_table **res)
+{
+ int ret;
+ struct xt_table_info *newinfo;
+ struct xt_table_info bootstrap = {0};
+ void *loc_cpu_entry;
+ struct xt_table *new_table;
+
+ newinfo = xt_alloc_table_info(repl->size);
+ if (!newinfo)
+ return -ENOMEM;
+
+ loc_cpu_entry = newinfo->entries;
+ memcpy(loc_cpu_entry, repl->entries, repl->size);
+
+ ret = translate_table(net, newinfo, loc_cpu_entry, repl);
+ if (ret != 0)
+ goto out_free;
+
+ new_table = xt_register_table(net, table, &bootstrap, newinfo);
+ if (IS_ERR(new_table)) {
+ ret = PTR_ERR(new_table);
+ goto out_free;
+ }
+
+ /* set res now, will see skbs right after nf_register_net_hooks */
+ WRITE_ONCE(*res, new_table);
+ if (!ops)
+ return 0;
+
+ ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks));
+ if (ret != 0) {
+ __ip6t_unregister_table(net, new_table);
+ *res = NULL;
+ }
+
+ return ret;
+
+out_free:
+ xt_free_table_info(newinfo);
+ return ret;
+}
+
+void ip6t_unregister_table(struct net *net, struct xt_table *table,
+ const struct nf_hook_ops *ops)
+{
+ if (ops)
+ nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks));
+ __ip6t_unregister_table(net, table);
+}
+
+/* Returns 1 if the type and code is matched by the range, 0 otherwise */
+static inline bool
+icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
+ u_int8_t type, u_int8_t code,
+ bool invert)
+{
+ return (type == test_type && code >= min_code && code <= max_code)
+ ^ invert;
+}
+
+static bool
+icmp6_match(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct icmp6hdr *ic;
+ struct icmp6hdr _icmph;
+ const struct ip6t_icmp *icmpinfo = par->matchinfo;
+
+ /* Must not be a fragment. */
+ if (par->fragoff != 0)
+ return false;
+
+ ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
+ if (ic == NULL) {
+ /* We've been asked to examine this packet, and we
+ * can't. Hence, no choice but to drop.
+ */
+ par->hotdrop = true;
+ return false;
+ }
+
+ return icmp6_type_code_match(icmpinfo->type,
+ icmpinfo->code[0],
+ icmpinfo->code[1],
+ ic->icmp6_type, ic->icmp6_code,
+ !!(icmpinfo->invflags&IP6T_ICMP_INV));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int icmp6_checkentry(const struct xt_mtchk_param *par)
+{
+ const struct ip6t_icmp *icmpinfo = par->matchinfo;
+
+ /* Must specify no unknown invflags */
+ return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0;
+}
+
+/* The built-in targets: standard (NULL) and error. */
+static struct xt_target ip6t_builtin_tg[] __read_mostly = {
+ {
+ .name = XT_STANDARD_TARGET,
+ .targetsize = sizeof(int),
+ .family = NFPROTO_IPV6,
+#ifdef CONFIG_COMPAT
+ .compatsize = sizeof(compat_int_t),
+ .compat_from_user = compat_standard_from_user,
+ .compat_to_user = compat_standard_to_user,
+#endif
+ },
+ {
+ .name = XT_ERROR_TARGET,
+ .target = ip6t_error,
+ .targetsize = XT_FUNCTION_MAXNAMELEN,
+ .family = NFPROTO_IPV6,
+ },
+};
+
+static struct nf_sockopt_ops ip6t_sockopts = {
+ .pf = PF_INET6,
+ .set_optmin = IP6T_BASE_CTL,
+ .set_optmax = IP6T_SO_SET_MAX+1,
+ .set = do_ip6t_set_ctl,
+#ifdef CONFIG_COMPAT
+ .compat_set = compat_do_ip6t_set_ctl,
+#endif
+ .get_optmin = IP6T_BASE_CTL,
+ .get_optmax = IP6T_SO_GET_MAX+1,
+ .get = do_ip6t_get_ctl,
+#ifdef CONFIG_COMPAT
+ .compat_get = compat_do_ip6t_get_ctl,
+#endif
+ .owner = THIS_MODULE,
+};
+
+static struct xt_match ip6t_builtin_mt[] __read_mostly = {
+ {
+ .name = "icmp6",
+ .match = icmp6_match,
+ .matchsize = sizeof(struct ip6t_icmp),
+ .checkentry = icmp6_checkentry,
+ .proto = IPPROTO_ICMPV6,
+ .family = NFPROTO_IPV6,
+ .me = THIS_MODULE,
+ },
+};
+
+static int __net_init ip6_tables_net_init(struct net *net)
+{
+ return xt_proto_init(net, NFPROTO_IPV6);
+}
+
+static void __net_exit ip6_tables_net_exit(struct net *net)
+{
+ xt_proto_fini(net, NFPROTO_IPV6);
+}
+
+static struct pernet_operations ip6_tables_net_ops = {
+ .init = ip6_tables_net_init,
+ .exit = ip6_tables_net_exit,
+};
+
+static int __init ip6_tables_init(void)
+{
+ int ret;
+
+ ret = register_pernet_subsys(&ip6_tables_net_ops);
+ if (ret < 0)
+ goto err1;
+
+ /* No one else will be downing sem now, so we won't sleep */
+ ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
+ if (ret < 0)
+ goto err2;
+ ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
+ if (ret < 0)
+ goto err4;
+
+ /* Register setsockopt */
+ ret = nf_register_sockopt(&ip6t_sockopts);
+ if (ret < 0)
+ goto err5;
+
+ return 0;
+
+err5:
+ xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
+err4:
+ xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
+err2:
+ unregister_pernet_subsys(&ip6_tables_net_ops);
+err1:
+ return ret;
+}
+
+static void __exit ip6_tables_fini(void)
+{
+ nf_unregister_sockopt(&ip6t_sockopts);
+
+ xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
+ xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
+ unregister_pernet_subsys(&ip6_tables_net_ops);
+}
+
+EXPORT_SYMBOL(ip6t_register_table);
+EXPORT_SYMBOL(ip6t_unregister_table);
+EXPORT_SYMBOL(ip6t_do_table);
+
+module_init(ip6_tables_init);
+module_exit(ip6_tables_fini);
diff --git a/net/ipv6/netfilter/ip6t_MASQUERADE.c b/net/ipv6/netfilter/ip6t_MASQUERADE.c
new file mode 100644
index 0000000..29c7f19
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_MASQUERADE.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Based on Rusty Russell's IPv6 MASQUERADE target. Development of IPv6
+ * NAT funded by Astaro.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/ipv6.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/x_tables.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/addrconf.h>
+#include <net/ipv6.h>
+#include <net/netfilter/ipv6/nf_nat_masquerade.h>
+
+static unsigned int
+masquerade_tg6(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ return nf_nat_masquerade_ipv6(skb, par->targinfo, xt_out(par));
+}
+
+static int masquerade_tg6_checkentry(const struct xt_tgchk_param *par)
+{
+ const struct nf_nat_range2 *range = par->targinfo;
+
+ if (range->flags & NF_NAT_RANGE_MAP_IPS)
+ return -EINVAL;
+ return nf_ct_netns_get(par->net, par->family);
+}
+
+static void masquerade_tg6_destroy(const struct xt_tgdtor_param *par)
+{
+ nf_ct_netns_put(par->net, par->family);
+}
+
+static struct xt_target masquerade_tg6_reg __read_mostly = {
+ .name = "MASQUERADE",
+ .family = NFPROTO_IPV6,
+ .checkentry = masquerade_tg6_checkentry,
+ .destroy = masquerade_tg6_destroy,
+ .target = masquerade_tg6,
+ .targetsize = sizeof(struct nf_nat_range),
+ .table = "nat",
+ .hooks = 1 << NF_INET_POST_ROUTING,
+ .me = THIS_MODULE,
+};
+
+static int __init masquerade_tg6_init(void)
+{
+ int err;
+
+ err = xt_register_target(&masquerade_tg6_reg);
+ if (err)
+ return err;
+
+ err = nf_nat_masquerade_ipv6_register_notifier();
+ if (err)
+ xt_unregister_target(&masquerade_tg6_reg);
+
+ return err;
+}
+static void __exit masquerade_tg6_exit(void)
+{
+ nf_nat_masquerade_ipv6_unregister_notifier();
+ xt_unregister_target(&masquerade_tg6_reg);
+}
+
+module_init(masquerade_tg6_init);
+module_exit(masquerade_tg6_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_DESCRIPTION("Xtables: automatic address SNAT");
diff --git a/net/ipv6/netfilter/ip6t_NPT.c b/net/ipv6/netfilter/ip6t_NPT.c
new file mode 100644
index 0000000..a379d2f
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_NPT.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2011, 2012 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <net/ipv6.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter_ipv6/ip6t_NPT.h>
+#include <linux/netfilter/x_tables.h>
+
+static int ip6t_npt_checkentry(const struct xt_tgchk_param *par)
+{
+ struct ip6t_npt_tginfo *npt = par->targinfo;
+ struct in6_addr pfx;
+ __wsum src_sum, dst_sum;
+
+ if (npt->src_pfx_len > 64 || npt->dst_pfx_len > 64)
+ return -EINVAL;
+
+ /* Ensure that LSB of prefix is zero */
+ ipv6_addr_prefix(&pfx, &npt->src_pfx.in6, npt->src_pfx_len);
+ if (!ipv6_addr_equal(&pfx, &npt->src_pfx.in6))
+ return -EINVAL;
+ ipv6_addr_prefix(&pfx, &npt->dst_pfx.in6, npt->dst_pfx_len);
+ if (!ipv6_addr_equal(&pfx, &npt->dst_pfx.in6))
+ return -EINVAL;
+
+ src_sum = csum_partial(&npt->src_pfx.in6, sizeof(npt->src_pfx.in6), 0);
+ dst_sum = csum_partial(&npt->dst_pfx.in6, sizeof(npt->dst_pfx.in6), 0);
+
+ npt->adjustment = ~csum_fold(csum_sub(src_sum, dst_sum));
+ return 0;
+}
+
+static bool ip6t_npt_map_pfx(const struct ip6t_npt_tginfo *npt,
+ struct in6_addr *addr)
+{
+ unsigned int pfx_len;
+ unsigned int i, idx;
+ __be32 mask;
+ __sum16 sum;
+
+ pfx_len = max(npt->src_pfx_len, npt->dst_pfx_len);
+ for (i = 0; i < pfx_len; i += 32) {
+ if (pfx_len - i >= 32)
+ mask = 0;
+ else
+ mask = htonl((1 << (i - pfx_len + 32)) - 1);
+
+ idx = i / 32;
+ addr->s6_addr32[idx] &= mask;
+ addr->s6_addr32[idx] |= ~mask & npt->dst_pfx.in6.s6_addr32[idx];
+ }
+
+ if (pfx_len <= 48)
+ idx = 3;
+ else {
+ for (idx = 4; idx < ARRAY_SIZE(addr->s6_addr16); idx++) {
+ if ((__force __sum16)addr->s6_addr16[idx] !=
+ CSUM_MANGLED_0)
+ break;
+ }
+ if (idx == ARRAY_SIZE(addr->s6_addr16))
+ return false;
+ }
+
+ sum = ~csum_fold(csum_add(csum_unfold((__force __sum16)addr->s6_addr16[idx]),
+ csum_unfold(npt->adjustment)));
+ if (sum == CSUM_MANGLED_0)
+ sum = 0;
+ *(__force __sum16 *)&addr->s6_addr16[idx] = sum;
+
+ return true;
+}
+
+static unsigned int
+ip6t_snpt_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ const struct ip6t_npt_tginfo *npt = par->targinfo;
+
+ if (!ip6t_npt_map_pfx(npt, &ipv6_hdr(skb)->saddr)) {
+ icmpv6_send(skb, ICMPV6_PARAMPROB, ICMPV6_HDR_FIELD,
+ offsetof(struct ipv6hdr, saddr));
+ return NF_DROP;
+ }
+ return XT_CONTINUE;
+}
+
+static unsigned int
+ip6t_dnpt_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ const struct ip6t_npt_tginfo *npt = par->targinfo;
+
+ if (!ip6t_npt_map_pfx(npt, &ipv6_hdr(skb)->daddr)) {
+ icmpv6_send(skb, ICMPV6_PARAMPROB, ICMPV6_HDR_FIELD,
+ offsetof(struct ipv6hdr, daddr));
+ return NF_DROP;
+ }
+ return XT_CONTINUE;
+}
+
+static struct xt_target ip6t_npt_target_reg[] __read_mostly = {
+ {
+ .name = "SNPT",
+ .table = "mangle",
+ .target = ip6t_snpt_tg,
+ .targetsize = sizeof(struct ip6t_npt_tginfo),
+ .usersize = offsetof(struct ip6t_npt_tginfo, adjustment),
+ .checkentry = ip6t_npt_checkentry,
+ .family = NFPROTO_IPV6,
+ .hooks = (1 << NF_INET_LOCAL_IN) |
+ (1 << NF_INET_POST_ROUTING),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "DNPT",
+ .table = "mangle",
+ .target = ip6t_dnpt_tg,
+ .targetsize = sizeof(struct ip6t_npt_tginfo),
+ .usersize = offsetof(struct ip6t_npt_tginfo, adjustment),
+ .checkentry = ip6t_npt_checkentry,
+ .family = NFPROTO_IPV6,
+ .hooks = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_LOCAL_OUT),
+ .me = THIS_MODULE,
+ },
+};
+
+static int __init ip6t_npt_init(void)
+{
+ return xt_register_targets(ip6t_npt_target_reg,
+ ARRAY_SIZE(ip6t_npt_target_reg));
+}
+
+static void __exit ip6t_npt_exit(void)
+{
+ xt_unregister_targets(ip6t_npt_target_reg,
+ ARRAY_SIZE(ip6t_npt_target_reg));
+}
+
+module_init(ip6t_npt_init);
+module_exit(ip6t_npt_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("IPv6-to-IPv6 Network Prefix Translation (RFC 6296)");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_ALIAS("ip6t_SNPT");
+MODULE_ALIAS("ip6t_DNPT");
diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
new file mode 100644
index 0000000..38dea8f
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -0,0 +1,125 @@
+/*
+ * IP6 tables REJECT target module
+ * Linux INET6 implementation
+ *
+ * Copyright (C)2003 USAGI/WIDE Project
+ *
+ * Authors:
+ * Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
+ *
+ * Copyright (c) 2005-2007 Patrick McHardy <kaber@trash.net>
+ *
+ * Based on net/ipv4/netfilter/ipt_REJECT.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/gfp.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/icmpv6.h>
+#include <linux/netdevice.h>
+#include <net/icmp.h>
+#include <net/flow.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_REJECT.h>
+
+#include <net/netfilter/ipv6/nf_reject.h>
+
+MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>");
+MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6");
+MODULE_LICENSE("GPL");
+
+static unsigned int
+reject_tg6(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ const struct ip6t_reject_info *reject = par->targinfo;
+ struct net *net = xt_net(par);
+
+ switch (reject->with) {
+ case IP6T_ICMP6_NO_ROUTE:
+ nf_send_unreach6(net, skb, ICMPV6_NOROUTE, xt_hooknum(par));
+ break;
+ case IP6T_ICMP6_ADM_PROHIBITED:
+ nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED,
+ xt_hooknum(par));
+ break;
+ case IP6T_ICMP6_NOT_NEIGHBOUR:
+ nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR,
+ xt_hooknum(par));
+ break;
+ case IP6T_ICMP6_ADDR_UNREACH:
+ nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH,
+ xt_hooknum(par));
+ break;
+ case IP6T_ICMP6_PORT_UNREACH:
+ nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH,
+ xt_hooknum(par));
+ break;
+ case IP6T_ICMP6_ECHOREPLY:
+ /* Do nothing */
+ break;
+ case IP6T_TCP_RESET:
+ nf_send_reset6(net, skb, xt_hooknum(par));
+ break;
+ case IP6T_ICMP6_POLICY_FAIL:
+ nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, xt_hooknum(par));
+ break;
+ case IP6T_ICMP6_REJECT_ROUTE:
+ nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE,
+ xt_hooknum(par));
+ break;
+ }
+
+ return NF_DROP;
+}
+
+static int reject_tg6_check(const struct xt_tgchk_param *par)
+{
+ const struct ip6t_reject_info *rejinfo = par->targinfo;
+ const struct ip6t_entry *e = par->entryinfo;
+
+ if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) {
+ pr_info_ratelimited("ECHOREPLY is not supported\n");
+ return -EINVAL;
+ } else if (rejinfo->with == IP6T_TCP_RESET) {
+ /* Must specify that it's a TCP packet */
+ if (!(e->ipv6.flags & IP6T_F_PROTO) ||
+ e->ipv6.proto != IPPROTO_TCP ||
+ (e->ipv6.invflags & XT_INV_PROTO)) {
+ pr_info_ratelimited("TCP_RESET illegal for non-tcp\n");
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static struct xt_target reject_tg6_reg __read_mostly = {
+ .name = "REJECT",
+ .family = NFPROTO_IPV6,
+ .target = reject_tg6,
+ .targetsize = sizeof(struct ip6t_reject_info),
+ .table = "filter",
+ .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) |
+ (1 << NF_INET_LOCAL_OUT),
+ .checkentry = reject_tg6_check,
+ .me = THIS_MODULE
+};
+
+static int __init reject_tg6_init(void)
+{
+ return xt_register_target(&reject_tg6_reg);
+}
+
+static void __exit reject_tg6_exit(void)
+{
+ xt_unregister_target(&reject_tg6_reg);
+}
+
+module_init(reject_tg6_init);
+module_exit(reject_tg6_exit);
diff --git a/net/ipv6/netfilter/ip6t_SYNPROXY.c b/net/ipv6/netfilter/ip6t_SYNPROXY.c
new file mode 100644
index 0000000..cb6d42b
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_SYNPROXY.c
@@ -0,0 +1,526 @@
+/*
+ * Copyright (c) 2013 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/ip6_checksum.h>
+#include <net/ip6_route.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_SYNPROXY.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_seqadj.h>
+#include <net/netfilter/nf_conntrack_synproxy.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
+
+static struct ipv6hdr *
+synproxy_build_ip(struct net *net, struct sk_buff *skb,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr)
+{
+ struct ipv6hdr *iph;
+
+ skb_reset_network_header(skb);
+ iph = skb_put(skb, sizeof(*iph));
+ ip6_flow_hdr(iph, 0, 0);
+ iph->hop_limit = net->ipv6.devconf_all->hop_limit;
+ iph->nexthdr = IPPROTO_TCP;
+ iph->saddr = *saddr;
+ iph->daddr = *daddr;
+
+ return iph;
+}
+
+static void
+synproxy_send_tcp(struct net *net,
+ const struct sk_buff *skb, struct sk_buff *nskb,
+ struct nf_conntrack *nfct, enum ip_conntrack_info ctinfo,
+ struct ipv6hdr *niph, struct tcphdr *nth,
+ unsigned int tcp_hdr_size)
+{
+ struct dst_entry *dst;
+ struct flowi6 fl6;
+
+ nth->check = ~tcp_v6_check(tcp_hdr_size, &niph->saddr, &niph->daddr, 0);
+ nskb->ip_summed = CHECKSUM_PARTIAL;
+ nskb->csum_start = (unsigned char *)nth - nskb->head;
+ nskb->csum_offset = offsetof(struct tcphdr, check);
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_TCP;
+ fl6.saddr = niph->saddr;
+ fl6.daddr = niph->daddr;
+ fl6.fl6_sport = nth->source;
+ fl6.fl6_dport = nth->dest;
+ security_skb_classify_flow((struct sk_buff *)skb, flowi6_to_flowi(&fl6));
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (dst->error) {
+ dst_release(dst);
+ goto free_nskb;
+ }
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
+ if (IS_ERR(dst))
+ goto free_nskb;
+
+ skb_dst_set(nskb, dst);
+
+ if (nfct) {
+ nf_ct_set(nskb, (struct nf_conn *)nfct, ctinfo);
+ nf_conntrack_get(nfct);
+ }
+
+ ip6_local_out(net, nskb->sk, nskb);
+ return;
+
+free_nskb:
+ kfree_skb(nskb);
+}
+
+static void
+synproxy_send_client_synack(struct net *net,
+ const struct sk_buff *skb, const struct tcphdr *th,
+ const struct synproxy_options *opts)
+{
+ struct sk_buff *nskb;
+ struct ipv6hdr *iph, *niph;
+ struct tcphdr *nth;
+ unsigned int tcp_hdr_size;
+ u16 mss = opts->mss;
+
+ iph = ipv6_hdr(skb);
+
+ tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts);
+ nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
+ GFP_ATOMIC);
+ if (nskb == NULL)
+ return;
+ skb_reserve(nskb, MAX_TCP_HEADER);
+
+ niph = synproxy_build_ip(net, nskb, &iph->daddr, &iph->saddr);
+
+ skb_reset_transport_header(nskb);
+ nth = skb_put(nskb, tcp_hdr_size);
+ nth->source = th->dest;
+ nth->dest = th->source;
+ nth->seq = htonl(__cookie_v6_init_sequence(iph, th, &mss));
+ nth->ack_seq = htonl(ntohl(th->seq) + 1);
+ tcp_flag_word(nth) = TCP_FLAG_SYN | TCP_FLAG_ACK;
+ if (opts->options & XT_SYNPROXY_OPT_ECN)
+ tcp_flag_word(nth) |= TCP_FLAG_ECE;
+ nth->doff = tcp_hdr_size / 4;
+ nth->window = 0;
+ nth->check = 0;
+ nth->urg_ptr = 0;
+
+ synproxy_build_options(nth, opts);
+
+ synproxy_send_tcp(net, skb, nskb, skb_nfct(skb),
+ IP_CT_ESTABLISHED_REPLY, niph, nth, tcp_hdr_size);
+}
+
+static void
+synproxy_send_server_syn(struct net *net,
+ const struct sk_buff *skb, const struct tcphdr *th,
+ const struct synproxy_options *opts, u32 recv_seq)
+{
+ struct synproxy_net *snet = synproxy_pernet(net);
+ struct sk_buff *nskb;
+ struct ipv6hdr *iph, *niph;
+ struct tcphdr *nth;
+ unsigned int tcp_hdr_size;
+
+ iph = ipv6_hdr(skb);
+
+ tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts);
+ nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
+ GFP_ATOMIC);
+ if (nskb == NULL)
+ return;
+ skb_reserve(nskb, MAX_TCP_HEADER);
+
+ niph = synproxy_build_ip(net, nskb, &iph->saddr, &iph->daddr);
+
+ skb_reset_transport_header(nskb);
+ nth = skb_put(nskb, tcp_hdr_size);
+ nth->source = th->source;
+ nth->dest = th->dest;
+ nth->seq = htonl(recv_seq - 1);
+ /* ack_seq is used to relay our ISN to the synproxy hook to initialize
+ * sequence number translation once a connection tracking entry exists.
+ */
+ nth->ack_seq = htonl(ntohl(th->ack_seq) - 1);
+ tcp_flag_word(nth) = TCP_FLAG_SYN;
+ if (opts->options & XT_SYNPROXY_OPT_ECN)
+ tcp_flag_word(nth) |= TCP_FLAG_ECE | TCP_FLAG_CWR;
+ nth->doff = tcp_hdr_size / 4;
+ nth->window = th->window;
+ nth->check = 0;
+ nth->urg_ptr = 0;
+
+ synproxy_build_options(nth, opts);
+
+ synproxy_send_tcp(net, skb, nskb, &snet->tmpl->ct_general, IP_CT_NEW,
+ niph, nth, tcp_hdr_size);
+}
+
+static void
+synproxy_send_server_ack(struct net *net,
+ const struct ip_ct_tcp *state,
+ const struct sk_buff *skb, const struct tcphdr *th,
+ const struct synproxy_options *opts)
+{
+ struct sk_buff *nskb;
+ struct ipv6hdr *iph, *niph;
+ struct tcphdr *nth;
+ unsigned int tcp_hdr_size;
+
+ iph = ipv6_hdr(skb);
+
+ tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts);
+ nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
+ GFP_ATOMIC);
+ if (nskb == NULL)
+ return;
+ skb_reserve(nskb, MAX_TCP_HEADER);
+
+ niph = synproxy_build_ip(net, nskb, &iph->daddr, &iph->saddr);
+
+ skb_reset_transport_header(nskb);
+ nth = skb_put(nskb, tcp_hdr_size);
+ nth->source = th->dest;
+ nth->dest = th->source;
+ nth->seq = htonl(ntohl(th->ack_seq));
+ nth->ack_seq = htonl(ntohl(th->seq) + 1);
+ tcp_flag_word(nth) = TCP_FLAG_ACK;
+ nth->doff = tcp_hdr_size / 4;
+ nth->window = htons(state->seen[IP_CT_DIR_ORIGINAL].td_maxwin);
+ nth->check = 0;
+ nth->urg_ptr = 0;
+
+ synproxy_build_options(nth, opts);
+
+ synproxy_send_tcp(net, skb, nskb, NULL, 0, niph, nth, tcp_hdr_size);
+}
+
+static void
+synproxy_send_client_ack(struct net *net,
+ const struct sk_buff *skb, const struct tcphdr *th,
+ const struct synproxy_options *opts)
+{
+ struct sk_buff *nskb;
+ struct ipv6hdr *iph, *niph;
+ struct tcphdr *nth;
+ unsigned int tcp_hdr_size;
+
+ iph = ipv6_hdr(skb);
+
+ tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts);
+ nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
+ GFP_ATOMIC);
+ if (nskb == NULL)
+ return;
+ skb_reserve(nskb, MAX_TCP_HEADER);
+
+ niph = synproxy_build_ip(net, nskb, &iph->saddr, &iph->daddr);
+
+ skb_reset_transport_header(nskb);
+ nth = skb_put(nskb, tcp_hdr_size);
+ nth->source = th->source;
+ nth->dest = th->dest;
+ nth->seq = htonl(ntohl(th->seq) + 1);
+ nth->ack_seq = th->ack_seq;
+ tcp_flag_word(nth) = TCP_FLAG_ACK;
+ nth->doff = tcp_hdr_size / 4;
+ nth->window = htons(ntohs(th->window) >> opts->wscale);
+ nth->check = 0;
+ nth->urg_ptr = 0;
+
+ synproxy_build_options(nth, opts);
+
+ synproxy_send_tcp(net, skb, nskb, skb_nfct(skb),
+ IP_CT_ESTABLISHED_REPLY, niph, nth, tcp_hdr_size);
+}
+
+static bool
+synproxy_recv_client_ack(struct net *net,
+ const struct sk_buff *skb, const struct tcphdr *th,
+ struct synproxy_options *opts, u32 recv_seq)
+{
+ struct synproxy_net *snet = synproxy_pernet(net);
+ int mss;
+
+ mss = __cookie_v6_check(ipv6_hdr(skb), th, ntohl(th->ack_seq) - 1);
+ if (mss == 0) {
+ this_cpu_inc(snet->stats->cookie_invalid);
+ return false;
+ }
+
+ this_cpu_inc(snet->stats->cookie_valid);
+ opts->mss = mss;
+ opts->options |= XT_SYNPROXY_OPT_MSS;
+
+ if (opts->options & XT_SYNPROXY_OPT_TIMESTAMP)
+ synproxy_check_timestamp_cookie(opts);
+
+ synproxy_send_server_syn(net, skb, th, opts, recv_seq);
+ return true;
+}
+
+static unsigned int
+synproxy_tg6(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ const struct xt_synproxy_info *info = par->targinfo;
+ struct net *net = xt_net(par);
+ struct synproxy_net *snet = synproxy_pernet(net);
+ struct synproxy_options opts = {};
+ struct tcphdr *th, _th;
+
+ if (nf_ip6_checksum(skb, xt_hooknum(par), par->thoff, IPPROTO_TCP))
+ return NF_DROP;
+
+ th = skb_header_pointer(skb, par->thoff, sizeof(_th), &_th);
+ if (th == NULL)
+ return NF_DROP;
+
+ if (!synproxy_parse_options(skb, par->thoff, th, &opts))
+ return NF_DROP;
+
+ if (th->syn && !(th->ack || th->fin || th->rst)) {
+ /* Initial SYN from client */
+ this_cpu_inc(snet->stats->syn_received);
+
+ if (th->ece && th->cwr)
+ opts.options |= XT_SYNPROXY_OPT_ECN;
+
+ opts.options &= info->options;
+ if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP)
+ synproxy_init_timestamp_cookie(info, &opts);
+ else
+ opts.options &= ~(XT_SYNPROXY_OPT_WSCALE |
+ XT_SYNPROXY_OPT_SACK_PERM |
+ XT_SYNPROXY_OPT_ECN);
+
+ synproxy_send_client_synack(net, skb, th, &opts);
+ consume_skb(skb);
+ return NF_STOLEN;
+
+ } else if (th->ack && !(th->fin || th->rst || th->syn)) {
+ /* ACK from client */
+ if (synproxy_recv_client_ack(net, skb, th, &opts, ntohl(th->seq))) {
+ consume_skb(skb);
+ return NF_STOLEN;
+ } else {
+ return NF_DROP;
+ }
+ }
+
+ return XT_CONTINUE;
+}
+
+static unsigned int ipv6_synproxy_hook(void *priv,
+ struct sk_buff *skb,
+ const struct nf_hook_state *nhs)
+{
+ struct net *net = nhs->net;
+ struct synproxy_net *snet = synproxy_pernet(net);
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct;
+ struct nf_conn_synproxy *synproxy;
+ struct synproxy_options opts = {};
+ const struct ip_ct_tcp *state;
+ struct tcphdr *th, _th;
+ __be16 frag_off;
+ u8 nexthdr;
+ int thoff;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ if (ct == NULL)
+ return NF_ACCEPT;
+
+ synproxy = nfct_synproxy(ct);
+ if (synproxy == NULL)
+ return NF_ACCEPT;
+
+ if (nf_is_loopback_packet(skb))
+ return NF_ACCEPT;
+
+ nexthdr = ipv6_hdr(skb)->nexthdr;
+ thoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
+ &frag_off);
+ if (thoff < 0 || nexthdr != IPPROTO_TCP)
+ return NF_ACCEPT;
+
+ th = skb_header_pointer(skb, thoff, sizeof(_th), &_th);
+ if (th == NULL)
+ return NF_DROP;
+
+ state = &ct->proto.tcp;
+ switch (state->state) {
+ case TCP_CONNTRACK_CLOSE:
+ if (th->rst && !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
+ nf_ct_seqadj_init(ct, ctinfo, synproxy->isn -
+ ntohl(th->seq) + 1);
+ break;
+ }
+
+ if (!th->syn || th->ack ||
+ CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
+ break;
+
+ /* Reopened connection - reset the sequence number and timestamp
+ * adjustments, they will get initialized once the connection is
+ * reestablished.
+ */
+ nf_ct_seqadj_init(ct, ctinfo, 0);
+ synproxy->tsoff = 0;
+ this_cpu_inc(snet->stats->conn_reopened);
+
+ /* fall through */
+ case TCP_CONNTRACK_SYN_SENT:
+ if (!synproxy_parse_options(skb, thoff, th, &opts))
+ return NF_DROP;
+
+ if (!th->syn && th->ack &&
+ CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) {
+ /* Keep-Alives are sent with SEG.SEQ = SND.NXT-1,
+ * therefore we need to add 1 to make the SYN sequence
+ * number match the one of first SYN.
+ */
+ if (synproxy_recv_client_ack(net, skb, th, &opts,
+ ntohl(th->seq) + 1)) {
+ this_cpu_inc(snet->stats->cookie_retrans);
+ consume_skb(skb);
+ return NF_STOLEN;
+ } else {
+ return NF_DROP;
+ }
+ }
+
+ synproxy->isn = ntohl(th->ack_seq);
+ if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP)
+ synproxy->its = opts.tsecr;
+
+ nf_conntrack_event_cache(IPCT_SYNPROXY, ct);
+ break;
+ case TCP_CONNTRACK_SYN_RECV:
+ if (!th->syn || !th->ack)
+ break;
+
+ if (!synproxy_parse_options(skb, thoff, th, &opts))
+ return NF_DROP;
+
+ if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP) {
+ synproxy->tsoff = opts.tsval - synproxy->its;
+ nf_conntrack_event_cache(IPCT_SYNPROXY, ct);
+ }
+
+ opts.options &= ~(XT_SYNPROXY_OPT_MSS |
+ XT_SYNPROXY_OPT_WSCALE |
+ XT_SYNPROXY_OPT_SACK_PERM);
+
+ swap(opts.tsval, opts.tsecr);
+ synproxy_send_server_ack(net, state, skb, th, &opts);
+
+ nf_ct_seqadj_init(ct, ctinfo, synproxy->isn - ntohl(th->seq));
+ nf_conntrack_event_cache(IPCT_SEQADJ, ct);
+
+ swap(opts.tsval, opts.tsecr);
+ synproxy_send_client_ack(net, skb, th, &opts);
+
+ consume_skb(skb);
+ return NF_STOLEN;
+ default:
+ break;
+ }
+
+ synproxy_tstamp_adjust(skb, thoff, th, ct, ctinfo, synproxy);
+ return NF_ACCEPT;
+}
+
+static const struct nf_hook_ops ipv6_synproxy_ops[] = {
+ {
+ .hook = ipv6_synproxy_hook,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = NF_IP_PRI_CONNTRACK_CONFIRM - 1,
+ },
+ {
+ .hook = ipv6_synproxy_hook,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_POST_ROUTING,
+ .priority = NF_IP_PRI_CONNTRACK_CONFIRM - 1,
+ },
+};
+
+static int synproxy_tg6_check(const struct xt_tgchk_param *par)
+{
+ struct synproxy_net *snet = synproxy_pernet(par->net);
+ const struct ip6t_entry *e = par->entryinfo;
+ int err;
+
+ if (!(e->ipv6.flags & IP6T_F_PROTO) ||
+ e->ipv6.proto != IPPROTO_TCP ||
+ e->ipv6.invflags & XT_INV_PROTO)
+ return -EINVAL;
+
+ err = nf_ct_netns_get(par->net, par->family);
+ if (err)
+ return err;
+
+ if (snet->hook_ref6 == 0) {
+ err = nf_register_net_hooks(par->net, ipv6_synproxy_ops,
+ ARRAY_SIZE(ipv6_synproxy_ops));
+ if (err) {
+ nf_ct_netns_put(par->net, par->family);
+ return err;
+ }
+ }
+
+ snet->hook_ref6++;
+ return err;
+}
+
+static void synproxy_tg6_destroy(const struct xt_tgdtor_param *par)
+{
+ struct synproxy_net *snet = synproxy_pernet(par->net);
+
+ snet->hook_ref6--;
+ if (snet->hook_ref6 == 0)
+ nf_unregister_net_hooks(par->net, ipv6_synproxy_ops,
+ ARRAY_SIZE(ipv6_synproxy_ops));
+ nf_ct_netns_put(par->net, par->family);
+}
+
+static struct xt_target synproxy_tg6_reg __read_mostly = {
+ .name = "SYNPROXY",
+ .family = NFPROTO_IPV6,
+ .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD),
+ .target = synproxy_tg6,
+ .targetsize = sizeof(struct xt_synproxy_info),
+ .checkentry = synproxy_tg6_check,
+ .destroy = synproxy_tg6_destroy,
+ .me = THIS_MODULE,
+};
+
+static int __init synproxy_tg6_init(void)
+{
+ return xt_register_target(&synproxy_tg6_reg);
+}
+
+static void __exit synproxy_tg6_exit(void)
+{
+ xt_unregister_target(&synproxy_tg6_reg);
+}
+
+module_init(synproxy_tg6_init);
+module_exit(synproxy_tg6_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
diff --git a/net/ipv6/netfilter/ip6t_ah.c b/net/ipv6/netfilter/ip6t_ah.c
new file mode 100644
index 0000000..04099ab
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_ah.c
@@ -0,0 +1,121 @@
+/* Kernel module to match AH parameters. */
+
+/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/types.h>
+#include <net/checksum.h>
+#include <net/ipv6.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_ah.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Xtables: IPv6 IPsec-AH match");
+MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
+
+/* Returns 1 if the spi is matched by the range, 0 otherwise */
+static inline bool
+spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, bool invert)
+{
+ bool r;
+
+ pr_debug("spi_match:%c 0x%x <= 0x%x <= 0x%x\n",
+ invert ? '!' : ' ', min, spi, max);
+ r = (spi >= min && spi <= max) ^ invert;
+ pr_debug(" result %s\n", r ? "PASS" : "FAILED");
+ return r;
+}
+
+static bool ah_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ struct ip_auth_hdr _ah;
+ const struct ip_auth_hdr *ah;
+ const struct ip6t_ah *ahinfo = par->matchinfo;
+ unsigned int ptr = 0;
+ unsigned int hdrlen = 0;
+ int err;
+
+ err = ipv6_find_hdr(skb, &ptr, NEXTHDR_AUTH, NULL, NULL);
+ if (err < 0) {
+ if (err != -ENOENT)
+ par->hotdrop = true;
+ return false;
+ }
+
+ ah = skb_header_pointer(skb, ptr, sizeof(_ah), &_ah);
+ if (ah == NULL) {
+ par->hotdrop = true;
+ return false;
+ }
+
+ hdrlen = (ah->hdrlen + 2) << 2;
+
+ pr_debug("IPv6 AH LEN %u %u ", hdrlen, ah->hdrlen);
+ pr_debug("RES %04X ", ah->reserved);
+ pr_debug("SPI %u %08X\n", ntohl(ah->spi), ntohl(ah->spi));
+
+ pr_debug("IPv6 AH spi %02X ",
+ spi_match(ahinfo->spis[0], ahinfo->spis[1],
+ ntohl(ah->spi),
+ !!(ahinfo->invflags & IP6T_AH_INV_SPI)));
+ pr_debug("len %02X %04X %02X ",
+ ahinfo->hdrlen, hdrlen,
+ (!ahinfo->hdrlen ||
+ (ahinfo->hdrlen == hdrlen) ^
+ !!(ahinfo->invflags & IP6T_AH_INV_LEN)));
+ pr_debug("res %02X %04X %02X\n",
+ ahinfo->hdrres, ah->reserved,
+ !(ahinfo->hdrres && ah->reserved));
+
+ return (ah != NULL) &&
+ spi_match(ahinfo->spis[0], ahinfo->spis[1],
+ ntohl(ah->spi),
+ !!(ahinfo->invflags & IP6T_AH_INV_SPI)) &&
+ (!ahinfo->hdrlen ||
+ (ahinfo->hdrlen == hdrlen) ^
+ !!(ahinfo->invflags & IP6T_AH_INV_LEN)) &&
+ !(ahinfo->hdrres && ah->reserved);
+}
+
+static int ah_mt6_check(const struct xt_mtchk_param *par)
+{
+ const struct ip6t_ah *ahinfo = par->matchinfo;
+
+ if (ahinfo->invflags & ~IP6T_AH_INV_MASK) {
+ pr_debug("unknown flags %X\n", ahinfo->invflags);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static struct xt_match ah_mt6_reg __read_mostly = {
+ .name = "ah",
+ .family = NFPROTO_IPV6,
+ .match = ah_mt6,
+ .matchsize = sizeof(struct ip6t_ah),
+ .checkentry = ah_mt6_check,
+ .me = THIS_MODULE,
+};
+
+static int __init ah_mt6_init(void)
+{
+ return xt_register_match(&ah_mt6_reg);
+}
+
+static void __exit ah_mt6_exit(void)
+{
+ xt_unregister_match(&ah_mt6_reg);
+}
+
+module_init(ah_mt6_init);
+module_exit(ah_mt6_exit);
diff --git a/net/ipv6/netfilter/ip6t_eui64.c b/net/ipv6/netfilter/ip6t_eui64.c
new file mode 100644
index 0000000..aab0706
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_eui64.c
@@ -0,0 +1,74 @@
+/* Kernel module to match EUI64 address parameters. */
+
+/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <linux/if_ether.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_DESCRIPTION("Xtables: IPv6 EUI64 address match");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
+
+static bool
+eui64_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ unsigned char eui64[8];
+
+ if (!(skb_mac_header(skb) >= skb->head &&
+ skb_mac_header(skb) + ETH_HLEN <= skb->data) &&
+ par->fragoff != 0) {
+ par->hotdrop = true;
+ return false;
+ }
+
+ memset(eui64, 0, sizeof(eui64));
+
+ if (eth_hdr(skb)->h_proto == htons(ETH_P_IPV6)) {
+ if (ipv6_hdr(skb)->version == 0x6) {
+ memcpy(eui64, eth_hdr(skb)->h_source, 3);
+ memcpy(eui64 + 5, eth_hdr(skb)->h_source + 3, 3);
+ eui64[3] = 0xff;
+ eui64[4] = 0xfe;
+ eui64[0] ^= 0x02;
+
+ if (!memcmp(ipv6_hdr(skb)->saddr.s6_addr + 8, eui64,
+ sizeof(eui64)))
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static struct xt_match eui64_mt6_reg __read_mostly = {
+ .name = "eui64",
+ .family = NFPROTO_IPV6,
+ .match = eui64_mt6,
+ .matchsize = sizeof(int),
+ .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) |
+ (1 << NF_INET_FORWARD),
+ .me = THIS_MODULE,
+};
+
+static int __init eui64_mt6_init(void)
+{
+ return xt_register_match(&eui64_mt6_reg);
+}
+
+static void __exit eui64_mt6_exit(void)
+{
+ xt_unregister_match(&eui64_mt6_reg);
+}
+
+module_init(eui64_mt6_init);
+module_exit(eui64_mt6_exit);
diff --git a/net/ipv6/netfilter/ip6t_frag.c b/net/ipv6/netfilter/ip6t_frag.c
new file mode 100644
index 0000000..3b5735e
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_frag.c
@@ -0,0 +1,136 @@
+/* Kernel module to match FRAG parameters. */
+
+/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <linux/types.h>
+#include <net/checksum.h>
+#include <net/ipv6.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_frag.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Xtables: IPv6 fragment match");
+MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
+
+/* Returns 1 if the id is matched by the range, 0 otherwise */
+static inline bool
+id_match(u_int32_t min, u_int32_t max, u_int32_t id, bool invert)
+{
+ bool r;
+ pr_debug("id_match:%c 0x%x <= 0x%x <= 0x%x\n", invert ? '!' : ' ',
+ min, id, max);
+ r = (id >= min && id <= max) ^ invert;
+ pr_debug(" result %s\n", r ? "PASS" : "FAILED");
+ return r;
+}
+
+static bool
+frag_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ struct frag_hdr _frag;
+ const struct frag_hdr *fh;
+ const struct ip6t_frag *fraginfo = par->matchinfo;
+ unsigned int ptr = 0;
+ int err;
+
+ err = ipv6_find_hdr(skb, &ptr, NEXTHDR_FRAGMENT, NULL, NULL);
+ if (err < 0) {
+ if (err != -ENOENT)
+ par->hotdrop = true;
+ return false;
+ }
+
+ fh = skb_header_pointer(skb, ptr, sizeof(_frag), &_frag);
+ if (fh == NULL) {
+ par->hotdrop = true;
+ return false;
+ }
+
+ pr_debug("INFO %04X ", fh->frag_off);
+ pr_debug("OFFSET %04X ", ntohs(fh->frag_off) & ~0x7);
+ pr_debug("RES %02X %04X", fh->reserved, ntohs(fh->frag_off) & 0x6);
+ pr_debug("MF %04X ", fh->frag_off & htons(IP6_MF));
+ pr_debug("ID %u %08X\n", ntohl(fh->identification),
+ ntohl(fh->identification));
+
+ pr_debug("IPv6 FRAG id %02X ",
+ id_match(fraginfo->ids[0], fraginfo->ids[1],
+ ntohl(fh->identification),
+ !!(fraginfo->invflags & IP6T_FRAG_INV_IDS)));
+ pr_debug("res %02X %02X%04X %02X ",
+ fraginfo->flags & IP6T_FRAG_RES, fh->reserved,
+ ntohs(fh->frag_off) & 0x6,
+ !((fraginfo->flags & IP6T_FRAG_RES) &&
+ (fh->reserved || (ntohs(fh->frag_off) & 0x06))));
+ pr_debug("first %02X %02X %02X ",
+ fraginfo->flags & IP6T_FRAG_FST,
+ ntohs(fh->frag_off) & ~0x7,
+ !((fraginfo->flags & IP6T_FRAG_FST) &&
+ (ntohs(fh->frag_off) & ~0x7)));
+ pr_debug("mf %02X %02X %02X ",
+ fraginfo->flags & IP6T_FRAG_MF,
+ ntohs(fh->frag_off) & IP6_MF,
+ !((fraginfo->flags & IP6T_FRAG_MF) &&
+ !((ntohs(fh->frag_off) & IP6_MF))));
+ pr_debug("last %02X %02X %02X\n",
+ fraginfo->flags & IP6T_FRAG_NMF,
+ ntohs(fh->frag_off) & IP6_MF,
+ !((fraginfo->flags & IP6T_FRAG_NMF) &&
+ (ntohs(fh->frag_off) & IP6_MF)));
+
+ return (fh != NULL) &&
+ id_match(fraginfo->ids[0], fraginfo->ids[1],
+ ntohl(fh->identification),
+ !!(fraginfo->invflags & IP6T_FRAG_INV_IDS)) &&
+ !((fraginfo->flags & IP6T_FRAG_RES) &&
+ (fh->reserved || (ntohs(fh->frag_off) & 0x6))) &&
+ !((fraginfo->flags & IP6T_FRAG_FST) &&
+ (ntohs(fh->frag_off) & ~0x7)) &&
+ !((fraginfo->flags & IP6T_FRAG_MF) &&
+ !(ntohs(fh->frag_off) & IP6_MF)) &&
+ !((fraginfo->flags & IP6T_FRAG_NMF) &&
+ (ntohs(fh->frag_off) & IP6_MF));
+}
+
+static int frag_mt6_check(const struct xt_mtchk_param *par)
+{
+ const struct ip6t_frag *fraginfo = par->matchinfo;
+
+ if (fraginfo->invflags & ~IP6T_FRAG_INV_MASK) {
+ pr_debug("unknown flags %X\n", fraginfo->invflags);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static struct xt_match frag_mt6_reg __read_mostly = {
+ .name = "frag",
+ .family = NFPROTO_IPV6,
+ .match = frag_mt6,
+ .matchsize = sizeof(struct ip6t_frag),
+ .checkentry = frag_mt6_check,
+ .me = THIS_MODULE,
+};
+
+static int __init frag_mt6_init(void)
+{
+ return xt_register_match(&frag_mt6_reg);
+}
+
+static void __exit frag_mt6_exit(void)
+{
+ xt_unregister_match(&frag_mt6_reg);
+}
+
+module_init(frag_mt6_init);
+module_exit(frag_mt6_exit);
diff --git a/net/ipv6/netfilter/ip6t_hbh.c b/net/ipv6/netfilter/ip6t_hbh.c
new file mode 100644
index 0000000..01df142
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_hbh.c
@@ -0,0 +1,215 @@
+/* Kernel module to match Hop-by-Hop and Destination parameters. */
+
+/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <linux/types.h>
+#include <net/checksum.h>
+#include <net/ipv6.h>
+
+#include <asm/byteorder.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_opts.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Xtables: IPv6 Hop-By-Hop and Destination Header match");
+MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
+MODULE_ALIAS("ip6t_dst");
+
+/*
+ * (Type & 0xC0) >> 6
+ * 0 -> ignorable
+ * 1 -> must drop the packet
+ * 2 -> send ICMP PARM PROB regardless and drop packet
+ * 3 -> Send ICMP if not a multicast address and drop packet
+ * (Type & 0x20) >> 5
+ * 0 -> invariant
+ * 1 -> can change the routing
+ * (Type & 0x1F) Type
+ * 0 -> Pad1 (only 1 byte!)
+ * 1 -> PadN LENGTH info (total length = length + 2)
+ * C0 | 2 -> JUMBO 4 x x x x ( xxxx > 64k )
+ * 5 -> RTALERT 2 x x
+ */
+
+static struct xt_match hbh_mt6_reg[] __read_mostly;
+
+static bool
+hbh_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ struct ipv6_opt_hdr _optsh;
+ const struct ipv6_opt_hdr *oh;
+ const struct ip6t_opts *optinfo = par->matchinfo;
+ unsigned int temp;
+ unsigned int ptr = 0;
+ unsigned int hdrlen = 0;
+ bool ret = false;
+ u8 _opttype;
+ u8 _optlen;
+ const u_int8_t *tp = NULL;
+ const u_int8_t *lp = NULL;
+ unsigned int optlen;
+ int err;
+
+ err = ipv6_find_hdr(skb, &ptr,
+ (par->match == &hbh_mt6_reg[0]) ?
+ NEXTHDR_HOP : NEXTHDR_DEST, NULL, NULL);
+ if (err < 0) {
+ if (err != -ENOENT)
+ par->hotdrop = true;
+ return false;
+ }
+
+ oh = skb_header_pointer(skb, ptr, sizeof(_optsh), &_optsh);
+ if (oh == NULL) {
+ par->hotdrop = true;
+ return false;
+ }
+
+ hdrlen = ipv6_optlen(oh);
+ if (skb->len - ptr < hdrlen) {
+ /* Packet smaller than it's length field */
+ return false;
+ }
+
+ pr_debug("IPv6 OPTS LEN %u %u ", hdrlen, oh->hdrlen);
+
+ pr_debug("len %02X %04X %02X ",
+ optinfo->hdrlen, hdrlen,
+ (!(optinfo->flags & IP6T_OPTS_LEN) ||
+ ((optinfo->hdrlen == hdrlen) ^
+ !!(optinfo->invflags & IP6T_OPTS_INV_LEN))));
+
+ ret = (oh != NULL) &&
+ (!(optinfo->flags & IP6T_OPTS_LEN) ||
+ ((optinfo->hdrlen == hdrlen) ^
+ !!(optinfo->invflags & IP6T_OPTS_INV_LEN)));
+
+ ptr += 2;
+ hdrlen -= 2;
+ if (!(optinfo->flags & IP6T_OPTS_OPTS)) {
+ return ret;
+ } else {
+ pr_debug("Strict ");
+ pr_debug("#%d ", optinfo->optsnr);
+ for (temp = 0; temp < optinfo->optsnr; temp++) {
+ /* type field exists ? */
+ if (hdrlen < 1)
+ break;
+ tp = skb_header_pointer(skb, ptr, sizeof(_opttype),
+ &_opttype);
+ if (tp == NULL)
+ break;
+
+ /* Type check */
+ if (*tp != (optinfo->opts[temp] & 0xFF00) >> 8) {
+ pr_debug("Tbad %02X %02X\n", *tp,
+ (optinfo->opts[temp] & 0xFF00) >> 8);
+ return false;
+ } else {
+ pr_debug("Tok ");
+ }
+ /* Length check */
+ if (*tp) {
+ u16 spec_len;
+
+ /* length field exists ? */
+ if (hdrlen < 2)
+ break;
+ lp = skb_header_pointer(skb, ptr + 1,
+ sizeof(_optlen),
+ &_optlen);
+ if (lp == NULL)
+ break;
+ spec_len = optinfo->opts[temp] & 0x00FF;
+
+ if (spec_len != 0x00FF && spec_len != *lp) {
+ pr_debug("Lbad %02X %04X\n", *lp,
+ spec_len);
+ return false;
+ }
+ pr_debug("Lok ");
+ optlen = *lp + 2;
+ } else {
+ pr_debug("Pad1\n");
+ optlen = 1;
+ }
+
+ /* Step to the next */
+ pr_debug("len%04X\n", optlen);
+
+ if ((ptr > skb->len - optlen || hdrlen < optlen) &&
+ temp < optinfo->optsnr - 1) {
+ pr_debug("new pointer is too large!\n");
+ break;
+ }
+ ptr += optlen;
+ hdrlen -= optlen;
+ }
+ if (temp == optinfo->optsnr)
+ return ret;
+ else
+ return false;
+ }
+
+ return false;
+}
+
+static int hbh_mt6_check(const struct xt_mtchk_param *par)
+{
+ const struct ip6t_opts *optsinfo = par->matchinfo;
+
+ if (optsinfo->invflags & ~IP6T_OPTS_INV_MASK) {
+ pr_debug("unknown flags %X\n", optsinfo->invflags);
+ return -EINVAL;
+ }
+
+ if (optsinfo->flags & IP6T_OPTS_NSTRICT) {
+ pr_debug("Not strict - not implemented");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct xt_match hbh_mt6_reg[] __read_mostly = {
+ {
+ /* Note, hbh_mt6 relies on the order of hbh_mt6_reg */
+ .name = "hbh",
+ .family = NFPROTO_IPV6,
+ .match = hbh_mt6,
+ .matchsize = sizeof(struct ip6t_opts),
+ .checkentry = hbh_mt6_check,
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "dst",
+ .family = NFPROTO_IPV6,
+ .match = hbh_mt6,
+ .matchsize = sizeof(struct ip6t_opts),
+ .checkentry = hbh_mt6_check,
+ .me = THIS_MODULE,
+ },
+};
+
+static int __init hbh_mt6_init(void)
+{
+ return xt_register_matches(hbh_mt6_reg, ARRAY_SIZE(hbh_mt6_reg));
+}
+
+static void __exit hbh_mt6_exit(void)
+{
+ xt_unregister_matches(hbh_mt6_reg, ARRAY_SIZE(hbh_mt6_reg));
+}
+
+module_init(hbh_mt6_init);
+module_exit(hbh_mt6_exit);
diff --git a/net/ipv6/netfilter/ip6t_ipv6header.c b/net/ipv6/netfilter/ip6t_ipv6header.c
new file mode 100644
index 0000000..8b14744
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_ipv6header.c
@@ -0,0 +1,153 @@
+/* ipv6header match - matches IPv6 packets based
+ on whether they contain certain headers */
+
+/* Original idea: Brad Chapman
+ * Rewritten by: Andras Kis-Szabo <kisza@sch.bme.hu> */
+
+/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <linux/types.h>
+#include <net/checksum.h>
+#include <net/ipv6.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_ipv6header.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Xtables: IPv6 header types match");
+MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
+
+static bool
+ipv6header_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct ip6t_ipv6header_info *info = par->matchinfo;
+ unsigned int temp;
+ int len;
+ u8 nexthdr;
+ unsigned int ptr;
+
+ /* Make sure this isn't an evil packet */
+
+ /* type of the 1st exthdr */
+ nexthdr = ipv6_hdr(skb)->nexthdr;
+ /* pointer to the 1st exthdr */
+ ptr = sizeof(struct ipv6hdr);
+ /* available length */
+ len = skb->len - ptr;
+ temp = 0;
+
+ while (ip6t_ext_hdr(nexthdr)) {
+ const struct ipv6_opt_hdr *hp;
+ struct ipv6_opt_hdr _hdr;
+ int hdrlen;
+
+ /* No more exthdr -> evaluate */
+ if (nexthdr == NEXTHDR_NONE) {
+ temp |= MASK_NONE;
+ break;
+ }
+ /* Is there enough space for the next ext header? */
+ if (len < (int)sizeof(struct ipv6_opt_hdr))
+ return false;
+ /* ESP -> evaluate */
+ if (nexthdr == NEXTHDR_ESP) {
+ temp |= MASK_ESP;
+ break;
+ }
+
+ hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
+ BUG_ON(hp == NULL);
+
+ /* Calculate the header length */
+ if (nexthdr == NEXTHDR_FRAGMENT)
+ hdrlen = 8;
+ else if (nexthdr == NEXTHDR_AUTH)
+ hdrlen = (hp->hdrlen + 2) << 2;
+ else
+ hdrlen = ipv6_optlen(hp);
+
+ /* set the flag */
+ switch (nexthdr) {
+ case NEXTHDR_HOP:
+ temp |= MASK_HOPOPTS;
+ break;
+ case NEXTHDR_ROUTING:
+ temp |= MASK_ROUTING;
+ break;
+ case NEXTHDR_FRAGMENT:
+ temp |= MASK_FRAGMENT;
+ break;
+ case NEXTHDR_AUTH:
+ temp |= MASK_AH;
+ break;
+ case NEXTHDR_DEST:
+ temp |= MASK_DSTOPTS;
+ break;
+ default:
+ return false;
+ }
+
+ nexthdr = hp->nexthdr;
+ len -= hdrlen;
+ ptr += hdrlen;
+ if (ptr > skb->len)
+ break;
+ }
+
+ if (nexthdr != NEXTHDR_NONE && nexthdr != NEXTHDR_ESP)
+ temp |= MASK_PROTO;
+
+ if (info->modeflag)
+ return !((temp ^ info->matchflags ^ info->invflags)
+ & info->matchflags);
+ else {
+ if (info->invflags)
+ return temp != info->matchflags;
+ else
+ return temp == info->matchflags;
+ }
+}
+
+static int ipv6header_mt6_check(const struct xt_mtchk_param *par)
+{
+ const struct ip6t_ipv6header_info *info = par->matchinfo;
+
+ /* invflags is 0 or 0xff in hard mode */
+ if ((!info->modeflag) && info->invflags != 0x00 &&
+ info->invflags != 0xFF)
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct xt_match ipv6header_mt6_reg __read_mostly = {
+ .name = "ipv6header",
+ .family = NFPROTO_IPV6,
+ .match = ipv6header_mt6,
+ .matchsize = sizeof(struct ip6t_ipv6header_info),
+ .checkentry = ipv6header_mt6_check,
+ .destroy = NULL,
+ .me = THIS_MODULE,
+};
+
+static int __init ipv6header_mt6_init(void)
+{
+ return xt_register_match(&ipv6header_mt6_reg);
+}
+
+static void __exit ipv6header_mt6_exit(void)
+{
+ xt_unregister_match(&ipv6header_mt6_reg);
+}
+
+module_init(ipv6header_mt6_init);
+module_exit(ipv6header_mt6_exit);
diff --git a/net/ipv6/netfilter/ip6t_mh.c b/net/ipv6/netfilter/ip6t_mh.c
new file mode 100644
index 0000000..0c90c66
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_mh.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C)2006 USAGI/WIDE Project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Author:
+ * Masahide NAKAMURA @USAGI <masahide.nakamura.cz@hitachi.com>
+ *
+ * Based on net/netfilter/xt_tcpudp.c
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/types.h>
+#include <linux/module.h>
+#include <net/ip.h>
+#include <linux/ipv6.h>
+#include <net/ipv6.h>
+#include <net/mip6.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6t_mh.h>
+
+MODULE_DESCRIPTION("Xtables: IPv6 Mobility Header match");
+MODULE_LICENSE("GPL");
+
+/* Returns 1 if the type is matched by the range, 0 otherwise */
+static inline bool
+type_match(u_int8_t min, u_int8_t max, u_int8_t type, bool invert)
+{
+ return (type >= min && type <= max) ^ invert;
+}
+
+static bool mh_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ struct ip6_mh _mh;
+ const struct ip6_mh *mh;
+ const struct ip6t_mh *mhinfo = par->matchinfo;
+
+ /* Must not be a fragment. */
+ if (par->fragoff != 0)
+ return false;
+
+ mh = skb_header_pointer(skb, par->thoff, sizeof(_mh), &_mh);
+ if (mh == NULL) {
+ /* We've been asked to examine this packet, and we
+ can't. Hence, no choice but to drop. */
+ pr_debug("Dropping evil MH tinygram.\n");
+ par->hotdrop = true;
+ return false;
+ }
+
+ if (mh->ip6mh_proto != IPPROTO_NONE) {
+ pr_debug("Dropping invalid MH Payload Proto: %u\n",
+ mh->ip6mh_proto);
+ par->hotdrop = true;
+ return false;
+ }
+
+ return type_match(mhinfo->types[0], mhinfo->types[1], mh->ip6mh_type,
+ !!(mhinfo->invflags & IP6T_MH_INV_TYPE));
+}
+
+static int mh_mt6_check(const struct xt_mtchk_param *par)
+{
+ const struct ip6t_mh *mhinfo = par->matchinfo;
+
+ /* Must specify no unknown invflags */
+ return (mhinfo->invflags & ~IP6T_MH_INV_MASK) ? -EINVAL : 0;
+}
+
+static struct xt_match mh_mt6_reg __read_mostly = {
+ .name = "mh",
+ .family = NFPROTO_IPV6,
+ .checkentry = mh_mt6_check,
+ .match = mh_mt6,
+ .matchsize = sizeof(struct ip6t_mh),
+ .proto = IPPROTO_MH,
+ .me = THIS_MODULE,
+};
+
+static int __init mh_mt6_init(void)
+{
+ return xt_register_match(&mh_mt6_reg);
+}
+
+static void __exit mh_mt6_exit(void)
+{
+ xt_unregister_match(&mh_mt6_reg);
+}
+
+module_init(mh_mt6_init);
+module_exit(mh_mt6_exit);
diff --git a/net/ipv6/netfilter/ip6t_rpfilter.c b/net/ipv6/netfilter/ip6t_rpfilter.c
new file mode 100644
index 0000000..c3c6b09
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_rpfilter.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2011 Florian Westphal <fw@strlen.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/route.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+
+#include <linux/netfilter/xt_rpfilter.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
+MODULE_DESCRIPTION("Xtables: IPv6 reverse path filter match");
+
+static bool rpfilter_addr_unicast(const struct in6_addr *addr)
+{
+ int addr_type = ipv6_addr_type(addr);
+ return addr_type & IPV6_ADDR_UNICAST;
+}
+
+static bool rpfilter_addr_linklocal(const struct in6_addr *addr)
+{
+ int addr_type = ipv6_addr_type(addr);
+ return addr_type & IPV6_ADDR_LINKLOCAL;
+}
+
+static bool rpfilter_lookup_reverse6(struct net *net, const struct sk_buff *skb,
+ const struct net_device *dev, u8 flags)
+{
+ struct rt6_info *rt;
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ bool ret = false;
+ struct flowi6 fl6 = {
+ .flowi6_iif = LOOPBACK_IFINDEX,
+ .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK,
+ .flowi6_proto = iph->nexthdr,
+ .daddr = iph->saddr,
+ };
+ int lookup_flags;
+
+ if (rpfilter_addr_unicast(&iph->daddr)) {
+ memcpy(&fl6.saddr, &iph->daddr, sizeof(struct in6_addr));
+ lookup_flags = RT6_LOOKUP_F_HAS_SADDR;
+ } else {
+ lookup_flags = 0;
+ }
+
+ fl6.flowi6_mark = flags & XT_RPFILTER_VALID_MARK ? skb->mark : 0;
+
+ if (rpfilter_addr_linklocal(&iph->saddr)) {
+ lookup_flags |= RT6_LOOKUP_F_IFACE;
+ fl6.flowi6_oif = dev->ifindex;
+ } else if ((flags & XT_RPFILTER_LOOSE) == 0)
+ fl6.flowi6_oif = dev->ifindex;
+
+ rt = (void *)ip6_route_lookup(net, &fl6, skb, lookup_flags);
+ if (rt->dst.error)
+ goto out;
+
+ if (rt->rt6i_flags & (RTF_REJECT|RTF_ANYCAST))
+ goto out;
+
+ if (rt->rt6i_flags & RTF_LOCAL) {
+ ret = flags & XT_RPFILTER_ACCEPT_LOCAL;
+ goto out;
+ }
+
+ if (rt->rt6i_idev->dev == dev || (flags & XT_RPFILTER_LOOSE))
+ ret = true;
+ out:
+ ip6_rt_put(rt);
+ return ret;
+}
+
+static bool
+rpfilter_is_loopback(const struct sk_buff *skb, const struct net_device *in)
+{
+ return skb->pkt_type == PACKET_LOOPBACK || in->flags & IFF_LOOPBACK;
+}
+
+static bool rpfilter_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct xt_rpfilter_info *info = par->matchinfo;
+ int saddrtype;
+ struct ipv6hdr *iph;
+ bool invert = info->flags & XT_RPFILTER_INVERT;
+
+ if (rpfilter_is_loopback(skb, xt_in(par)))
+ return true ^ invert;
+
+ iph = ipv6_hdr(skb);
+ saddrtype = ipv6_addr_type(&iph->saddr);
+ if (unlikely(saddrtype == IPV6_ADDR_ANY))
+ return true ^ invert; /* not routable: forward path will drop it */
+
+ return rpfilter_lookup_reverse6(xt_net(par), skb, xt_in(par),
+ info->flags) ^ invert;
+}
+
+static int rpfilter_check(const struct xt_mtchk_param *par)
+{
+ const struct xt_rpfilter_info *info = par->matchinfo;
+ unsigned int options = ~XT_RPFILTER_OPTION_MASK;
+
+ if (info->flags & options) {
+ pr_info_ratelimited("unknown options\n");
+ return -EINVAL;
+ }
+
+ if (strcmp(par->table, "mangle") != 0 &&
+ strcmp(par->table, "raw") != 0) {
+ pr_info_ratelimited("only valid in \'raw\' or \'mangle\' table, not \'%s\'\n",
+ par->table);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct xt_match rpfilter_mt_reg __read_mostly = {
+ .name = "rpfilter",
+ .family = NFPROTO_IPV6,
+ .checkentry = rpfilter_check,
+ .match = rpfilter_mt,
+ .matchsize = sizeof(struct xt_rpfilter_info),
+ .hooks = (1 << NF_INET_PRE_ROUTING),
+ .me = THIS_MODULE
+};
+
+static int __init rpfilter_mt_init(void)
+{
+ return xt_register_match(&rpfilter_mt_reg);
+}
+
+static void __exit rpfilter_mt_exit(void)
+{
+ xt_unregister_match(&rpfilter_mt_reg);
+}
+
+module_init(rpfilter_mt_init);
+module_exit(rpfilter_mt_exit);
diff --git a/net/ipv6/netfilter/ip6t_rt.c b/net/ipv6/netfilter/ip6t_rt.c
new file mode 100644
index 0000000..2c99b94
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_rt.c
@@ -0,0 +1,225 @@
+/* Kernel module to match ROUTING parameters. */
+
+/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <linux/types.h>
+#include <net/checksum.h>
+#include <net/ipv6.h>
+
+#include <asm/byteorder.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_rt.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Xtables: IPv6 Routing Header match");
+MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
+
+/* Returns 1 if the id is matched by the range, 0 otherwise */
+static inline bool
+segsleft_match(u_int32_t min, u_int32_t max, u_int32_t id, bool invert)
+{
+ bool r;
+ pr_debug("segsleft_match:%c 0x%x <= 0x%x <= 0x%x\n",
+ invert ? '!' : ' ', min, id, max);
+ r = (id >= min && id <= max) ^ invert;
+ pr_debug(" result %s\n", r ? "PASS" : "FAILED");
+ return r;
+}
+
+static bool rt_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ struct ipv6_rt_hdr _route;
+ const struct ipv6_rt_hdr *rh;
+ const struct ip6t_rt *rtinfo = par->matchinfo;
+ unsigned int temp;
+ unsigned int ptr = 0;
+ unsigned int hdrlen = 0;
+ bool ret = false;
+ struct in6_addr _addr;
+ const struct in6_addr *ap;
+ int err;
+
+ err = ipv6_find_hdr(skb, &ptr, NEXTHDR_ROUTING, NULL, NULL);
+ if (err < 0) {
+ if (err != -ENOENT)
+ par->hotdrop = true;
+ return false;
+ }
+
+ rh = skb_header_pointer(skb, ptr, sizeof(_route), &_route);
+ if (rh == NULL) {
+ par->hotdrop = true;
+ return false;
+ }
+
+ hdrlen = ipv6_optlen(rh);
+ if (skb->len - ptr < hdrlen) {
+ /* Pcket smaller than its length field */
+ return false;
+ }
+
+ pr_debug("IPv6 RT LEN %u %u ", hdrlen, rh->hdrlen);
+ pr_debug("TYPE %04X ", rh->type);
+ pr_debug("SGS_LEFT %u %02X\n", rh->segments_left, rh->segments_left);
+
+ pr_debug("IPv6 RT segsleft %02X ",
+ segsleft_match(rtinfo->segsleft[0], rtinfo->segsleft[1],
+ rh->segments_left,
+ !!(rtinfo->invflags & IP6T_RT_INV_SGS)));
+ pr_debug("type %02X %02X %02X ",
+ rtinfo->rt_type, rh->type,
+ (!(rtinfo->flags & IP6T_RT_TYP) ||
+ ((rtinfo->rt_type == rh->type) ^
+ !!(rtinfo->invflags & IP6T_RT_INV_TYP))));
+ pr_debug("len %02X %04X %02X ",
+ rtinfo->hdrlen, hdrlen,
+ !(rtinfo->flags & IP6T_RT_LEN) ||
+ ((rtinfo->hdrlen == hdrlen) ^
+ !!(rtinfo->invflags & IP6T_RT_INV_LEN)));
+ pr_debug("res %02X %02X %02X ",
+ rtinfo->flags & IP6T_RT_RES,
+ ((const struct rt0_hdr *)rh)->reserved,
+ !((rtinfo->flags & IP6T_RT_RES) &&
+ (((const struct rt0_hdr *)rh)->reserved)));
+
+ ret = (rh != NULL) &&
+ (segsleft_match(rtinfo->segsleft[0], rtinfo->segsleft[1],
+ rh->segments_left,
+ !!(rtinfo->invflags & IP6T_RT_INV_SGS))) &&
+ (!(rtinfo->flags & IP6T_RT_LEN) ||
+ ((rtinfo->hdrlen == hdrlen) ^
+ !!(rtinfo->invflags & IP6T_RT_INV_LEN))) &&
+ (!(rtinfo->flags & IP6T_RT_TYP) ||
+ ((rtinfo->rt_type == rh->type) ^
+ !!(rtinfo->invflags & IP6T_RT_INV_TYP)));
+
+ if (ret && (rtinfo->flags & IP6T_RT_RES)) {
+ const u_int32_t *rp;
+ u_int32_t _reserved;
+ rp = skb_header_pointer(skb,
+ ptr + offsetof(struct rt0_hdr,
+ reserved),
+ sizeof(_reserved),
+ &_reserved);
+
+ ret = (*rp == 0);
+ }
+
+ pr_debug("#%d ", rtinfo->addrnr);
+ if (!(rtinfo->flags & IP6T_RT_FST)) {
+ return ret;
+ } else if (rtinfo->flags & IP6T_RT_FST_NSTRICT) {
+ pr_debug("Not strict ");
+ if (rtinfo->addrnr > (unsigned int)((hdrlen - 8) / 16)) {
+ pr_debug("There isn't enough space\n");
+ return false;
+ } else {
+ unsigned int i = 0;
+
+ pr_debug("#%d ", rtinfo->addrnr);
+ for (temp = 0;
+ temp < (unsigned int)((hdrlen - 8) / 16);
+ temp++) {
+ ap = skb_header_pointer(skb,
+ ptr
+ + sizeof(struct rt0_hdr)
+ + temp * sizeof(_addr),
+ sizeof(_addr),
+ &_addr);
+
+ BUG_ON(ap == NULL);
+
+ if (ipv6_addr_equal(ap, &rtinfo->addrs[i])) {
+ pr_debug("i=%d temp=%d;\n", i, temp);
+ i++;
+ }
+ if (i == rtinfo->addrnr)
+ break;
+ }
+ pr_debug("i=%d #%d\n", i, rtinfo->addrnr);
+ if (i == rtinfo->addrnr)
+ return ret;
+ else
+ return false;
+ }
+ } else {
+ pr_debug("Strict ");
+ if (rtinfo->addrnr > (unsigned int)((hdrlen - 8) / 16)) {
+ pr_debug("There isn't enough space\n");
+ return false;
+ } else {
+ pr_debug("#%d ", rtinfo->addrnr);
+ for (temp = 0; temp < rtinfo->addrnr; temp++) {
+ ap = skb_header_pointer(skb,
+ ptr
+ + sizeof(struct rt0_hdr)
+ + temp * sizeof(_addr),
+ sizeof(_addr),
+ &_addr);
+ BUG_ON(ap == NULL);
+
+ if (!ipv6_addr_equal(ap, &rtinfo->addrs[temp]))
+ break;
+ }
+ pr_debug("temp=%d #%d\n", temp, rtinfo->addrnr);
+ if (temp == rtinfo->addrnr &&
+ temp == (unsigned int)((hdrlen - 8) / 16))
+ return ret;
+ else
+ return false;
+ }
+ }
+
+ return false;
+}
+
+static int rt_mt6_check(const struct xt_mtchk_param *par)
+{
+ const struct ip6t_rt *rtinfo = par->matchinfo;
+
+ if (rtinfo->invflags & ~IP6T_RT_INV_MASK) {
+ pr_debug("unknown flags %X\n", rtinfo->invflags);
+ return -EINVAL;
+ }
+ if ((rtinfo->flags & (IP6T_RT_RES | IP6T_RT_FST_MASK)) &&
+ (!(rtinfo->flags & IP6T_RT_TYP) ||
+ (rtinfo->rt_type != 0) ||
+ (rtinfo->invflags & IP6T_RT_INV_TYP))) {
+ pr_debug("`--rt-type 0' required before `--rt-0-*'");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct xt_match rt_mt6_reg __read_mostly = {
+ .name = "rt",
+ .family = NFPROTO_IPV6,
+ .match = rt_mt6,
+ .matchsize = sizeof(struct ip6t_rt),
+ .checkentry = rt_mt6_check,
+ .me = THIS_MODULE,
+};
+
+static int __init rt_mt6_init(void)
+{
+ return xt_register_match(&rt_mt6_reg);
+}
+
+static void __exit rt_mt6_exit(void)
+{
+ xt_unregister_match(&rt_mt6_reg);
+}
+
+module_init(rt_mt6_init);
+module_exit(rt_mt6_exit);
diff --git a/net/ipv6/netfilter/ip6t_srh.c b/net/ipv6/netfilter/ip6t_srh.c
new file mode 100644
index 0000000..1059894
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_srh.c
@@ -0,0 +1,318 @@
+/* Kernel module to match Segment Routing Header (SRH) parameters. */
+
+/* Author:
+ * Ahmed Abdelsalam <amsalam20@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <linux/types.h>
+#include <net/ipv6.h>
+#include <net/seg6.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6t_srh.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+/* Test a struct->mt_invflags and a boolean for inequality */
+#define NF_SRH_INVF(ptr, flag, boolean) \
+ ((boolean) ^ !!((ptr)->mt_invflags & (flag)))
+
+static bool srh_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct ip6t_srh *srhinfo = par->matchinfo;
+ struct ipv6_sr_hdr *srh;
+ struct ipv6_sr_hdr _srh;
+ int hdrlen, srhoff = 0;
+
+ if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
+ return false;
+ srh = skb_header_pointer(skb, srhoff, sizeof(_srh), &_srh);
+ if (!srh)
+ return false;
+
+ hdrlen = ipv6_optlen(srh);
+ if (skb->len - srhoff < hdrlen)
+ return false;
+
+ if (srh->type != IPV6_SRCRT_TYPE_4)
+ return false;
+
+ if (srh->segments_left > srh->first_segment)
+ return false;
+
+ /* Next Header matching */
+ if (srhinfo->mt_flags & IP6T_SRH_NEXTHDR)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_NEXTHDR,
+ !(srh->nexthdr == srhinfo->next_hdr)))
+ return false;
+
+ /* Header Extension Length matching */
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_EQ)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LEN_EQ,
+ !(srh->hdrlen == srhinfo->hdr_len)))
+ return false;
+
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_GT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LEN_GT,
+ !(srh->hdrlen > srhinfo->hdr_len)))
+ return false;
+
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_LT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LEN_LT,
+ !(srh->hdrlen < srhinfo->hdr_len)))
+ return false;
+
+ /* Segments Left matching */
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_EQ)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_SEGS_EQ,
+ !(srh->segments_left == srhinfo->segs_left)))
+ return false;
+
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_GT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_SEGS_GT,
+ !(srh->segments_left > srhinfo->segs_left)))
+ return false;
+
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_LT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_SEGS_LT,
+ !(srh->segments_left < srhinfo->segs_left)))
+ return false;
+
+ /**
+ * Last Entry matching
+ * Last_Entry field was introduced in revision 6 of the SRH draft.
+ * It was called First_Segment in the previous revision
+ */
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_EQ)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LAST_EQ,
+ !(srh->first_segment == srhinfo->last_entry)))
+ return false;
+
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_GT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LAST_GT,
+ !(srh->first_segment > srhinfo->last_entry)))
+ return false;
+
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_LT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LAST_LT,
+ !(srh->first_segment < srhinfo->last_entry)))
+ return false;
+
+ /**
+ * Tag matchig
+ * Tag field was introduced in revision 6 of the SRH draft.
+ */
+ if (srhinfo->mt_flags & IP6T_SRH_TAG)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_TAG,
+ !(srh->tag == srhinfo->tag)))
+ return false;
+ return true;
+}
+
+static bool srh1_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ int hdrlen, psidoff, nsidoff, lsidoff, srhoff = 0;
+ const struct ip6t_srh1 *srhinfo = par->matchinfo;
+ struct in6_addr *psid, *nsid, *lsid;
+ struct in6_addr _psid, _nsid, _lsid;
+ struct ipv6_sr_hdr *srh;
+ struct ipv6_sr_hdr _srh;
+
+ if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
+ return false;
+ srh = skb_header_pointer(skb, srhoff, sizeof(_srh), &_srh);
+ if (!srh)
+ return false;
+
+ hdrlen = ipv6_optlen(srh);
+ if (skb->len - srhoff < hdrlen)
+ return false;
+
+ if (srh->type != IPV6_SRCRT_TYPE_4)
+ return false;
+
+ if (srh->segments_left > srh->first_segment)
+ return false;
+
+ /* Next Header matching */
+ if (srhinfo->mt_flags & IP6T_SRH_NEXTHDR)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_NEXTHDR,
+ !(srh->nexthdr == srhinfo->next_hdr)))
+ return false;
+
+ /* Header Extension Length matching */
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_EQ)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LEN_EQ,
+ !(srh->hdrlen == srhinfo->hdr_len)))
+ return false;
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_GT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LEN_GT,
+ !(srh->hdrlen > srhinfo->hdr_len)))
+ return false;
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_LT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LEN_LT,
+ !(srh->hdrlen < srhinfo->hdr_len)))
+ return false;
+
+ /* Segments Left matching */
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_EQ)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_SEGS_EQ,
+ !(srh->segments_left == srhinfo->segs_left)))
+ return false;
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_GT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_SEGS_GT,
+ !(srh->segments_left > srhinfo->segs_left)))
+ return false;
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_LT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_SEGS_LT,
+ !(srh->segments_left < srhinfo->segs_left)))
+ return false;
+
+ /**
+ * Last Entry matching
+ * Last_Entry field was introduced in revision 6 of the SRH draft.
+ * It was called First_Segment in the previous revision
+ */
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_EQ)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LAST_EQ,
+ !(srh->first_segment == srhinfo->last_entry)))
+ return false;
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_GT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LAST_GT,
+ !(srh->first_segment > srhinfo->last_entry)))
+ return false;
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_LT)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LAST_LT,
+ !(srh->first_segment < srhinfo->last_entry)))
+ return false;
+
+ /**
+ * Tag matchig
+ * Tag field was introduced in revision 6 of the SRH draft
+ */
+ if (srhinfo->mt_flags & IP6T_SRH_TAG)
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_TAG,
+ !(srh->tag == srhinfo->tag)))
+ return false;
+
+ /* Previous SID matching */
+ if (srhinfo->mt_flags & IP6T_SRH_PSID) {
+ if (srh->segments_left == srh->first_segment)
+ return false;
+ psidoff = srhoff + sizeof(struct ipv6_sr_hdr) +
+ ((srh->segments_left + 1) * sizeof(struct in6_addr));
+ psid = skb_header_pointer(skb, psidoff, sizeof(_psid), &_psid);
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_PSID,
+ ipv6_masked_addr_cmp(psid, &srhinfo->psid_msk,
+ &srhinfo->psid_addr)))
+ return false;
+ }
+
+ /* Next SID matching */
+ if (srhinfo->mt_flags & IP6T_SRH_NSID) {
+ if (srh->segments_left == 0)
+ return false;
+ nsidoff = srhoff + sizeof(struct ipv6_sr_hdr) +
+ ((srh->segments_left - 1) * sizeof(struct in6_addr));
+ nsid = skb_header_pointer(skb, nsidoff, sizeof(_nsid), &_nsid);
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_NSID,
+ ipv6_masked_addr_cmp(nsid, &srhinfo->nsid_msk,
+ &srhinfo->nsid_addr)))
+ return false;
+ }
+
+ /* Last SID matching */
+ if (srhinfo->mt_flags & IP6T_SRH_LSID) {
+ lsidoff = srhoff + sizeof(struct ipv6_sr_hdr);
+ lsid = skb_header_pointer(skb, lsidoff, sizeof(_lsid), &_lsid);
+ if (NF_SRH_INVF(srhinfo, IP6T_SRH_INV_LSID,
+ ipv6_masked_addr_cmp(lsid, &srhinfo->lsid_msk,
+ &srhinfo->lsid_addr)))
+ return false;
+ }
+ return true;
+}
+
+static int srh_mt6_check(const struct xt_mtchk_param *par)
+{
+ const struct ip6t_srh *srhinfo = par->matchinfo;
+
+ if (srhinfo->mt_flags & ~IP6T_SRH_MASK) {
+ pr_info_ratelimited("unknown srh match flags %X\n",
+ srhinfo->mt_flags);
+ return -EINVAL;
+ }
+
+ if (srhinfo->mt_invflags & ~IP6T_SRH_INV_MASK) {
+ pr_info_ratelimited("unknown srh invflags %X\n",
+ srhinfo->mt_invflags);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int srh1_mt6_check(const struct xt_mtchk_param *par)
+{
+ const struct ip6t_srh1 *srhinfo = par->matchinfo;
+
+ if (srhinfo->mt_flags & ~IP6T_SRH_MASK) {
+ pr_info_ratelimited("unknown srh match flags %X\n",
+ srhinfo->mt_flags);
+ return -EINVAL;
+ }
+
+ if (srhinfo->mt_invflags & ~IP6T_SRH_INV_MASK) {
+ pr_info_ratelimited("unknown srh invflags %X\n",
+ srhinfo->mt_invflags);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct xt_match srh_mt6_reg[] __read_mostly = {
+ {
+ .name = "srh",
+ .revision = 0,
+ .family = NFPROTO_IPV6,
+ .match = srh_mt6,
+ .matchsize = sizeof(struct ip6t_srh),
+ .checkentry = srh_mt6_check,
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "srh",
+ .revision = 1,
+ .family = NFPROTO_IPV6,
+ .match = srh1_mt6,
+ .matchsize = sizeof(struct ip6t_srh1),
+ .checkentry = srh1_mt6_check,
+ .me = THIS_MODULE,
+ }
+};
+
+static int __init srh_mt6_init(void)
+{
+ return xt_register_matches(srh_mt6_reg, ARRAY_SIZE(srh_mt6_reg));
+}
+
+static void __exit srh_mt6_exit(void)
+{
+ xt_unregister_matches(srh_mt6_reg, ARRAY_SIZE(srh_mt6_reg));
+}
+
+module_init(srh_mt6_init);
+module_exit(srh_mt6_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Xtables: IPv6 Segment Routing Header match");
+MODULE_AUTHOR("Ahmed Abdelsalam <amsalam20@gmail.com>");
diff --git a/net/ipv6/netfilter/ip6table_filter.c b/net/ipv6/netfilter/ip6table_filter.c
new file mode 100644
index 0000000..1343077
--- /dev/null
+++ b/net/ipv6/netfilter/ip6table_filter.c
@@ -0,0 +1,114 @@
+/*
+ * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
+ *
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/slab.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("ip6tables filter table");
+
+#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
+ (1 << NF_INET_FORWARD) | \
+ (1 << NF_INET_LOCAL_OUT))
+
+static int __net_init ip6table_filter_table_init(struct net *net);
+
+static const struct xt_table packet_filter = {
+ .name = "filter",
+ .valid_hooks = FILTER_VALID_HOOKS,
+ .me = THIS_MODULE,
+ .af = NFPROTO_IPV6,
+ .priority = NF_IP6_PRI_FILTER,
+ .table_init = ip6table_filter_table_init,
+};
+
+/* The work comes in here from netfilter.c. */
+static unsigned int
+ip6table_filter_hook(void *priv, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip6t_do_table(skb, state, state->net->ipv6.ip6table_filter);
+}
+
+static struct nf_hook_ops *filter_ops __read_mostly;
+
+/* Default to forward because I got too much mail already. */
+static bool forward = true;
+module_param(forward, bool, 0000);
+
+static int __net_init ip6table_filter_table_init(struct net *net)
+{
+ struct ip6t_replace *repl;
+ int err;
+
+ if (net->ipv6.ip6table_filter)
+ return 0;
+
+ repl = ip6t_alloc_initial_table(&packet_filter);
+ if (repl == NULL)
+ return -ENOMEM;
+ /* Entry 1 is the FORWARD hook */
+ ((struct ip6t_standard *)repl->entries)[1].target.verdict =
+ forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
+
+ err = ip6t_register_table(net, &packet_filter, repl, filter_ops,
+ &net->ipv6.ip6table_filter);
+ kfree(repl);
+ return err;
+}
+
+static int __net_init ip6table_filter_net_init(struct net *net)
+{
+ if (net == &init_net || !forward)
+ return ip6table_filter_table_init(net);
+
+ return 0;
+}
+
+static void __net_exit ip6table_filter_net_exit(struct net *net)
+{
+ if (!net->ipv6.ip6table_filter)
+ return;
+ ip6t_unregister_table(net, net->ipv6.ip6table_filter, filter_ops);
+ net->ipv6.ip6table_filter = NULL;
+}
+
+static struct pernet_operations ip6table_filter_net_ops = {
+ .init = ip6table_filter_net_init,
+ .exit = ip6table_filter_net_exit,
+};
+
+static int __init ip6table_filter_init(void)
+{
+ int ret;
+
+ filter_ops = xt_hook_ops_alloc(&packet_filter, ip6table_filter_hook);
+ if (IS_ERR(filter_ops))
+ return PTR_ERR(filter_ops);
+
+ ret = register_pernet_subsys(&ip6table_filter_net_ops);
+ if (ret < 0)
+ kfree(filter_ops);
+
+ return ret;
+}
+
+static void __exit ip6table_filter_fini(void)
+{
+ unregister_pernet_subsys(&ip6table_filter_net_ops);
+ kfree(filter_ops);
+}
+
+module_init(ip6table_filter_init);
+module_exit(ip6table_filter_fini);
diff --git a/net/ipv6/netfilter/ip6table_mangle.c b/net/ipv6/netfilter/ip6table_mangle.c
new file mode 100644
index 0000000..b0524b1
--- /dev/null
+++ b/net/ipv6/netfilter/ip6table_mangle.c
@@ -0,0 +1,141 @@
+/*
+ * IPv6 packet mangling table, a port of the IPv4 mangle table to IPv6
+ *
+ * Copyright (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/slab.h>
+#include <net/ipv6.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("ip6tables mangle table");
+
+#define MANGLE_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | \
+ (1 << NF_INET_LOCAL_IN) | \
+ (1 << NF_INET_FORWARD) | \
+ (1 << NF_INET_LOCAL_OUT) | \
+ (1 << NF_INET_POST_ROUTING))
+
+static int __net_init ip6table_mangle_table_init(struct net *net);
+
+static const struct xt_table packet_mangler = {
+ .name = "mangle",
+ .valid_hooks = MANGLE_VALID_HOOKS,
+ .me = THIS_MODULE,
+ .af = NFPROTO_IPV6,
+ .priority = NF_IP6_PRI_MANGLE,
+ .table_init = ip6table_mangle_table_init,
+};
+
+static unsigned int
+ip6t_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
+{
+ unsigned int ret;
+ struct in6_addr saddr, daddr;
+ u_int8_t hop_limit;
+ u_int32_t flowlabel, mark;
+ int err;
+
+ /* save source/dest address, mark, hoplimit, flowlabel, priority, */
+ memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
+ memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
+ mark = skb->mark;
+ hop_limit = ipv6_hdr(skb)->hop_limit;
+
+ /* flowlabel and prio (includes version, which shouldn't change either */
+ flowlabel = *((u_int32_t *)ipv6_hdr(skb));
+
+ ret = ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
+
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ (!ipv6_addr_equal(&ipv6_hdr(skb)->saddr, &saddr) ||
+ !ipv6_addr_equal(&ipv6_hdr(skb)->daddr, &daddr) ||
+ skb->mark != mark ||
+ ipv6_hdr(skb)->hop_limit != hop_limit ||
+ flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
+ err = ip6_route_me_harder(state->net, skb);
+ if (err < 0)
+ ret = NF_DROP_ERR(err);
+ }
+
+ return ret;
+}
+
+/* The work comes in here from netfilter.c. */
+static unsigned int
+ip6table_mangle_hook(void *priv, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ if (state->hook == NF_INET_LOCAL_OUT)
+ return ip6t_mangle_out(skb, state);
+ return ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
+}
+
+static struct nf_hook_ops *mangle_ops __read_mostly;
+static int __net_init ip6table_mangle_table_init(struct net *net)
+{
+ struct ip6t_replace *repl;
+ int ret;
+
+ if (net->ipv6.ip6table_mangle)
+ return 0;
+
+ repl = ip6t_alloc_initial_table(&packet_mangler);
+ if (repl == NULL)
+ return -ENOMEM;
+ ret = ip6t_register_table(net, &packet_mangler, repl, mangle_ops,
+ &net->ipv6.ip6table_mangle);
+ kfree(repl);
+ return ret;
+}
+
+static void __net_exit ip6table_mangle_net_exit(struct net *net)
+{
+ if (!net->ipv6.ip6table_mangle)
+ return;
+
+ ip6t_unregister_table(net, net->ipv6.ip6table_mangle, mangle_ops);
+ net->ipv6.ip6table_mangle = NULL;
+}
+
+static struct pernet_operations ip6table_mangle_net_ops = {
+ .exit = ip6table_mangle_net_exit,
+};
+
+static int __init ip6table_mangle_init(void)
+{
+ int ret;
+
+ mangle_ops = xt_hook_ops_alloc(&packet_mangler, ip6table_mangle_hook);
+ if (IS_ERR(mangle_ops))
+ return PTR_ERR(mangle_ops);
+
+ ret = register_pernet_subsys(&ip6table_mangle_net_ops);
+ if (ret < 0) {
+ kfree(mangle_ops);
+ return ret;
+ }
+
+ ret = ip6table_mangle_table_init(&init_net);
+ if (ret) {
+ unregister_pernet_subsys(&ip6table_mangle_net_ops);
+ kfree(mangle_ops);
+ }
+ return ret;
+}
+
+static void __exit ip6table_mangle_fini(void)
+{
+ unregister_pernet_subsys(&ip6table_mangle_net_ops);
+ kfree(mangle_ops);
+}
+
+module_init(ip6table_mangle_init);
+module_exit(ip6table_mangle_fini);
diff --git a/net/ipv6/netfilter/ip6table_nat.c b/net/ipv6/netfilter/ip6table_nat.c
new file mode 100644
index 0000000..67ba70a
--- /dev/null
+++ b/net/ipv6/netfilter/ip6table_nat.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Based on Rusty Russell's IPv4 NAT code. Development of IPv6 NAT
+ * funded by Astaro.
+ */
+
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/ipv6.h>
+#include <net/ipv6.h>
+
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+
+static int __net_init ip6table_nat_table_init(struct net *net);
+
+static const struct xt_table nf_nat_ipv6_table = {
+ .name = "nat",
+ .valid_hooks = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_POST_ROUTING) |
+ (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_LOCAL_IN),
+ .me = THIS_MODULE,
+ .af = NFPROTO_IPV6,
+ .table_init = ip6table_nat_table_init,
+};
+
+static unsigned int ip6table_nat_do_chain(void *priv,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip6t_do_table(skb, state, state->net->ipv6.ip6table_nat);
+}
+
+static const struct nf_hook_ops nf_nat_ipv6_ops[] = {
+ {
+ .hook = ip6table_nat_do_chain,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_PRE_ROUTING,
+ .priority = NF_IP6_PRI_NAT_DST,
+ },
+ {
+ .hook = ip6table_nat_do_chain,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_POST_ROUTING,
+ .priority = NF_IP6_PRI_NAT_SRC,
+ },
+ {
+ .hook = ip6table_nat_do_chain,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP6_PRI_NAT_DST,
+ },
+ {
+ .hook = ip6table_nat_do_chain,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = NF_IP6_PRI_NAT_SRC,
+ },
+};
+
+static int ip6t_nat_register_lookups(struct net *net)
+{
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(nf_nat_ipv6_ops); i++) {
+ ret = nf_nat_l3proto_ipv6_register_fn(net, &nf_nat_ipv6_ops[i]);
+ if (ret) {
+ while (i)
+ nf_nat_l3proto_ipv6_unregister_fn(net, &nf_nat_ipv6_ops[--i]);
+
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static void ip6t_nat_unregister_lookups(struct net *net)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(nf_nat_ipv6_ops); i++)
+ nf_nat_l3proto_ipv6_unregister_fn(net, &nf_nat_ipv6_ops[i]);
+}
+
+static int __net_init ip6table_nat_table_init(struct net *net)
+{
+ struct ip6t_replace *repl;
+ int ret;
+
+ if (net->ipv6.ip6table_nat)
+ return 0;
+
+ repl = ip6t_alloc_initial_table(&nf_nat_ipv6_table);
+ if (repl == NULL)
+ return -ENOMEM;
+ ret = ip6t_register_table(net, &nf_nat_ipv6_table, repl,
+ NULL, &net->ipv6.ip6table_nat);
+ if (ret < 0) {
+ kfree(repl);
+ return ret;
+ }
+
+ ret = ip6t_nat_register_lookups(net);
+ if (ret < 0) {
+ ip6t_unregister_table(net, net->ipv6.ip6table_nat, NULL);
+ net->ipv6.ip6table_nat = NULL;
+ }
+ kfree(repl);
+ return ret;
+}
+
+static void __net_exit ip6table_nat_net_exit(struct net *net)
+{
+ if (!net->ipv6.ip6table_nat)
+ return;
+ ip6t_nat_unregister_lookups(net);
+ ip6t_unregister_table(net, net->ipv6.ip6table_nat, NULL);
+ net->ipv6.ip6table_nat = NULL;
+}
+
+static struct pernet_operations ip6table_nat_net_ops = {
+ .exit = ip6table_nat_net_exit,
+};
+
+static int __init ip6table_nat_init(void)
+{
+ int ret = register_pernet_subsys(&ip6table_nat_net_ops);
+
+ if (ret)
+ return ret;
+
+ ret = ip6table_nat_table_init(&init_net);
+ if (ret)
+ unregister_pernet_subsys(&ip6table_nat_net_ops);
+ return ret;
+}
+
+static void __exit ip6table_nat_exit(void)
+{
+ unregister_pernet_subsys(&ip6table_nat_net_ops);
+}
+
+module_init(ip6table_nat_init);
+module_exit(ip6table_nat_exit);
+
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/netfilter/ip6table_raw.c b/net/ipv6/netfilter/ip6table_raw.c
new file mode 100644
index 0000000..710fa08
--- /dev/null
+++ b/net/ipv6/netfilter/ip6table_raw.c
@@ -0,0 +1,118 @@
+/*
+ * IPv6 raw table, a port of the IPv4 raw table to IPv6
+ *
+ * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/slab.h>
+
+#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
+
+static int __net_init ip6table_raw_table_init(struct net *net);
+
+static bool raw_before_defrag __read_mostly;
+MODULE_PARM_DESC(raw_before_defrag, "Enable raw table before defrag");
+module_param(raw_before_defrag, bool, 0000);
+
+static const struct xt_table packet_raw = {
+ .name = "raw",
+ .valid_hooks = RAW_VALID_HOOKS,
+ .me = THIS_MODULE,
+ .af = NFPROTO_IPV6,
+ .priority = NF_IP6_PRI_RAW,
+ .table_init = ip6table_raw_table_init,
+};
+
+static const struct xt_table packet_raw_before_defrag = {
+ .name = "raw",
+ .valid_hooks = RAW_VALID_HOOKS,
+ .me = THIS_MODULE,
+ .af = NFPROTO_IPV6,
+ .priority = NF_IP6_PRI_RAW_BEFORE_DEFRAG,
+ .table_init = ip6table_raw_table_init,
+};
+
+/* The work comes in here from netfilter.c. */
+static unsigned int
+ip6table_raw_hook(void *priv, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip6t_do_table(skb, state, state->net->ipv6.ip6table_raw);
+}
+
+static struct nf_hook_ops *rawtable_ops __read_mostly;
+
+static int __net_init ip6table_raw_table_init(struct net *net)
+{
+ struct ip6t_replace *repl;
+ const struct xt_table *table = &packet_raw;
+ int ret;
+
+ if (raw_before_defrag)
+ table = &packet_raw_before_defrag;
+
+ if (net->ipv6.ip6table_raw)
+ return 0;
+
+ repl = ip6t_alloc_initial_table(table);
+ if (repl == NULL)
+ return -ENOMEM;
+ ret = ip6t_register_table(net, table, repl, rawtable_ops,
+ &net->ipv6.ip6table_raw);
+ kfree(repl);
+ return ret;
+}
+
+static void __net_exit ip6table_raw_net_exit(struct net *net)
+{
+ if (!net->ipv6.ip6table_raw)
+ return;
+ ip6t_unregister_table(net, net->ipv6.ip6table_raw, rawtable_ops);
+ net->ipv6.ip6table_raw = NULL;
+}
+
+static struct pernet_operations ip6table_raw_net_ops = {
+ .exit = ip6table_raw_net_exit,
+};
+
+static int __init ip6table_raw_init(void)
+{
+ int ret;
+ const struct xt_table *table = &packet_raw;
+
+ if (raw_before_defrag) {
+ table = &packet_raw_before_defrag;
+
+ pr_info("Enabling raw table before defrag\n");
+ }
+
+ /* Register hooks */
+ rawtable_ops = xt_hook_ops_alloc(table, ip6table_raw_hook);
+ if (IS_ERR(rawtable_ops))
+ return PTR_ERR(rawtable_ops);
+
+ ret = register_pernet_subsys(&ip6table_raw_net_ops);
+ if (ret < 0) {
+ kfree(rawtable_ops);
+ return ret;
+ }
+
+ ret = ip6table_raw_table_init(&init_net);
+ if (ret) {
+ unregister_pernet_subsys(&ip6table_raw_net_ops);
+ kfree(rawtable_ops);
+ }
+ return ret;
+}
+
+static void __exit ip6table_raw_fini(void)
+{
+ unregister_pernet_subsys(&ip6table_raw_net_ops);
+ kfree(rawtable_ops);
+}
+
+module_init(ip6table_raw_init);
+module_exit(ip6table_raw_fini);
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/netfilter/ip6table_security.c b/net/ipv6/netfilter/ip6table_security.c
new file mode 100644
index 0000000..cf26ccb
--- /dev/null
+++ b/net/ipv6/netfilter/ip6table_security.c
@@ -0,0 +1,108 @@
+/*
+ * "security" table for IPv6
+ *
+ * This is for use by Mandatory Access Control (MAC) security models,
+ * which need to be able to manage security policy in separate context
+ * to DAC.
+ *
+ * Based on iptable_mangle.c
+ *
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
+ * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/slab.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
+MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
+
+#define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \
+ (1 << NF_INET_FORWARD) | \
+ (1 << NF_INET_LOCAL_OUT)
+
+static int __net_init ip6table_security_table_init(struct net *net);
+
+static const struct xt_table security_table = {
+ .name = "security",
+ .valid_hooks = SECURITY_VALID_HOOKS,
+ .me = THIS_MODULE,
+ .af = NFPROTO_IPV6,
+ .priority = NF_IP6_PRI_SECURITY,
+ .table_init = ip6table_security_table_init,
+};
+
+static unsigned int
+ip6table_security_hook(void *priv, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip6t_do_table(skb, state, state->net->ipv6.ip6table_security);
+}
+
+static struct nf_hook_ops *sectbl_ops __read_mostly;
+
+static int __net_init ip6table_security_table_init(struct net *net)
+{
+ struct ip6t_replace *repl;
+ int ret;
+
+ if (net->ipv6.ip6table_security)
+ return 0;
+
+ repl = ip6t_alloc_initial_table(&security_table);
+ if (repl == NULL)
+ return -ENOMEM;
+ ret = ip6t_register_table(net, &security_table, repl, sectbl_ops,
+ &net->ipv6.ip6table_security);
+ kfree(repl);
+ return ret;
+}
+
+static void __net_exit ip6table_security_net_exit(struct net *net)
+{
+ if (!net->ipv6.ip6table_security)
+ return;
+ ip6t_unregister_table(net, net->ipv6.ip6table_security, sectbl_ops);
+ net->ipv6.ip6table_security = NULL;
+}
+
+static struct pernet_operations ip6table_security_net_ops = {
+ .exit = ip6table_security_net_exit,
+};
+
+static int __init ip6table_security_init(void)
+{
+ int ret;
+
+ sectbl_ops = xt_hook_ops_alloc(&security_table, ip6table_security_hook);
+ if (IS_ERR(sectbl_ops))
+ return PTR_ERR(sectbl_ops);
+
+ ret = register_pernet_subsys(&ip6table_security_net_ops);
+ if (ret < 0) {
+ kfree(sectbl_ops);
+ return ret;
+ }
+
+ ret = ip6table_security_table_init(&init_net);
+ if (ret) {
+ unregister_pernet_subsys(&ip6table_security_net_ops);
+ kfree(sectbl_ops);
+ }
+ return ret;
+}
+
+static void __exit ip6table_security_fini(void)
+{
+ unregister_pernet_subsys(&ip6table_security_net_ops);
+ kfree(sectbl_ops);
+}
+
+module_init(ip6table_security_init);
+module_exit(ip6table_security_fini);
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
new file mode 100644
index 0000000..043ed8e
--- /dev/null
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -0,0 +1,676 @@
+/*
+ * IPv6 fragment reassembly for connection tracking
+ *
+ * Copyright (C)2004 USAGI/WIDE Project
+ *
+ * Author:
+ * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ *
+ * Based on: net/ipv6/reassembly.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) "IPv6-nf: " fmt
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/jiffies.h>
+#include <linux/net.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+#include <net/ipv6_frag.h>
+
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/rawv6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/inet_ecn.h>
+#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
+#include <linux/sysctl.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
+
+static const char nf_frags_cache_name[] = "nf-frags";
+
+static struct inet_frags nf_frags;
+
+#ifdef CONFIG_SYSCTL
+
+static struct ctl_table nf_ct_frag6_sysctl_table[] = {
+ {
+ .procname = "nf_conntrack_frag6_timeout",
+ .data = &init_net.nf_frag.frags.timeout,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "nf_conntrack_frag6_low_thresh",
+ .data = &init_net.nf_frag.frags.low_thresh,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ .extra2 = &init_net.nf_frag.frags.high_thresh
+ },
+ {
+ .procname = "nf_conntrack_frag6_high_thresh",
+ .data = &init_net.nf_frag.frags.high_thresh,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ .extra1 = &init_net.nf_frag.frags.low_thresh
+ },
+ { }
+};
+
+static int nf_ct_frag6_sysctl_register(struct net *net)
+{
+ struct ctl_table *table;
+ struct ctl_table_header *hdr;
+
+ table = nf_ct_frag6_sysctl_table;
+ if (!net_eq(net, &init_net)) {
+ table = kmemdup(table, sizeof(nf_ct_frag6_sysctl_table),
+ GFP_KERNEL);
+ if (table == NULL)
+ goto err_alloc;
+
+ table[0].data = &net->nf_frag.frags.timeout;
+ table[1].data = &net->nf_frag.frags.low_thresh;
+ table[1].extra2 = &net->nf_frag.frags.high_thresh;
+ table[2].data = &net->nf_frag.frags.high_thresh;
+ table[2].extra1 = &net->nf_frag.frags.low_thresh;
+ table[2].extra2 = &init_net.nf_frag.frags.high_thresh;
+ }
+
+ hdr = register_net_sysctl(net, "net/netfilter", table);
+ if (hdr == NULL)
+ goto err_reg;
+
+ net->nf_frag_frags_hdr = hdr;
+ return 0;
+
+err_reg:
+ if (!net_eq(net, &init_net))
+ kfree(table);
+err_alloc:
+ return -ENOMEM;
+}
+
+static void __net_exit nf_ct_frags6_sysctl_unregister(struct net *net)
+{
+ struct ctl_table *table;
+
+ table = net->nf_frag_frags_hdr->ctl_table_arg;
+ unregister_net_sysctl_table(net->nf_frag_frags_hdr);
+ if (!net_eq(net, &init_net))
+ kfree(table);
+}
+
+#else
+static int nf_ct_frag6_sysctl_register(struct net *net)
+{
+ return 0;
+}
+static void __net_exit nf_ct_frags6_sysctl_unregister(struct net *net)
+{
+}
+#endif
+
+static inline u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h)
+{
+ return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK);
+}
+
+static void nf_ct_frag6_expire(struct timer_list *t)
+{
+ struct inet_frag_queue *frag = from_timer(frag, t, timer);
+ struct frag_queue *fq;
+ struct net *net;
+
+ fq = container_of(frag, struct frag_queue, q);
+ net = container_of(fq->q.net, struct net, nf_frag.frags);
+
+ ip6frag_expire_frag_queue(net, fq);
+}
+
+/* Creation primitives. */
+static struct frag_queue *fq_find(struct net *net, __be32 id, u32 user,
+ const struct ipv6hdr *hdr, int iif)
+{
+ struct frag_v6_compare_key key = {
+ .id = id,
+ .saddr = hdr->saddr,
+ .daddr = hdr->daddr,
+ .user = user,
+ .iif = iif,
+ };
+ struct inet_frag_queue *q;
+
+ q = inet_frag_find(&net->nf_frag.frags, &key);
+ if (!q)
+ return NULL;
+
+ return container_of(q, struct frag_queue, q);
+}
+
+
+static int nf_ct_frag6_queue(struct frag_queue *fq, struct sk_buff *skb,
+ const struct frag_hdr *fhdr, int nhoff)
+{
+ struct sk_buff *prev, *next;
+ unsigned int payload_len;
+ int offset, end;
+ u8 ecn;
+
+ if (fq->q.flags & INET_FRAG_COMPLETE) {
+ pr_debug("Already completed\n");
+ goto err;
+ }
+
+ payload_len = ntohs(ipv6_hdr(skb)->payload_len);
+
+ offset = ntohs(fhdr->frag_off) & ~0x7;
+ end = offset + (payload_len -
+ ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
+
+ if ((unsigned int)end > IPV6_MAXPLEN) {
+ pr_debug("offset is too large.\n");
+ return -EINVAL;
+ }
+
+ ecn = ip6_frag_ecn(ipv6_hdr(skb));
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ const unsigned char *nh = skb_network_header(skb);
+ skb->csum = csum_sub(skb->csum,
+ csum_partial(nh, (u8 *)(fhdr + 1) - nh,
+ 0));
+ }
+
+ /* Is this the final fragment? */
+ if (!(fhdr->frag_off & htons(IP6_MF))) {
+ /* If we already have some bits beyond end
+ * or have different end, the segment is corrupted.
+ */
+ if (end < fq->q.len ||
+ ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) {
+ pr_debug("already received last fragment\n");
+ goto err;
+ }
+ fq->q.flags |= INET_FRAG_LAST_IN;
+ fq->q.len = end;
+ } else {
+ /* Check if the fragment is rounded to 8 bytes.
+ * Required by the RFC.
+ */
+ if (end & 0x7) {
+ /* RFC2460 says always send parameter problem in
+ * this case. -DaveM
+ */
+ pr_debug("end of fragment not rounded to 8 bytes.\n");
+ inet_frag_kill(&fq->q);
+ return -EPROTO;
+ }
+ if (end > fq->q.len) {
+ /* Some bits beyond end -> corruption. */
+ if (fq->q.flags & INET_FRAG_LAST_IN) {
+ pr_debug("last packet already reached.\n");
+ goto err;
+ }
+ fq->q.len = end;
+ }
+ }
+
+ if (end == offset)
+ goto err;
+
+ /* Point into the IP datagram 'data' part. */
+ if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) {
+ pr_debug("queue: message is too short.\n");
+ goto err;
+ }
+ if (pskb_trim_rcsum(skb, end - offset)) {
+ pr_debug("Can't trim\n");
+ goto err;
+ }
+
+ /* Find out which fragments are in front and at the back of us
+ * in the chain of fragments so far. We must know where to put
+ * this fragment, right?
+ */
+ prev = fq->q.fragments_tail;
+ if (!prev || prev->ip_defrag_offset < offset) {
+ next = NULL;
+ goto found;
+ }
+ prev = NULL;
+ for (next = fq->q.fragments; next != NULL; next = next->next) {
+ if (next->ip_defrag_offset >= offset)
+ break; /* bingo! */
+ prev = next;
+ }
+
+found:
+ /* RFC5722, Section 4:
+ * When reassembling an IPv6 datagram, if
+ * one or more its constituent fragments is determined to be an
+ * overlapping fragment, the entire datagram (and any constituent
+ * fragments, including those not yet received) MUST be silently
+ * discarded.
+ */
+
+ /* Check for overlap with preceding fragment. */
+ if (prev &&
+ (prev->ip_defrag_offset + prev->len) > offset)
+ goto discard_fq;
+
+ /* Look for overlap with succeeding segment. */
+ if (next && next->ip_defrag_offset < end)
+ goto discard_fq;
+
+ /* Note : skb->ip_defrag_offset and skb->dev share the same location */
+ if (skb->dev)
+ fq->iif = skb->dev->ifindex;
+ /* Makes sure compiler wont do silly aliasing games */
+ barrier();
+ skb->ip_defrag_offset = offset;
+
+ /* Insert this fragment in the chain of fragments. */
+ skb->next = next;
+ if (!next)
+ fq->q.fragments_tail = skb;
+ if (prev)
+ prev->next = skb;
+ else
+ fq->q.fragments = skb;
+
+ fq->q.stamp = skb->tstamp;
+ fq->q.meat += skb->len;
+ fq->ecn |= ecn;
+ if (payload_len > fq->q.max_size)
+ fq->q.max_size = payload_len;
+ add_frag_mem_limit(fq->q.net, skb->truesize);
+
+ /* The first fragment.
+ * nhoffset is obtained from the first fragment, of course.
+ */
+ if (offset == 0) {
+ fq->nhoffset = nhoff;
+ fq->q.flags |= INET_FRAG_FIRST_IN;
+ }
+
+ return 0;
+
+discard_fq:
+ inet_frag_kill(&fq->q);
+err:
+ return -EINVAL;
+}
+
+/*
+ * Check if this packet is complete.
+ *
+ * It is called with locked fq, and caller must check that
+ * queue is eligible for reassembly i.e. it is not COMPLETE,
+ * the last and the first frames arrived and all the bits are here.
+ *
+ * returns true if *prev skb has been transformed into the reassembled
+ * skb, false otherwise.
+ */
+static bool
+nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *prev, struct net_device *dev)
+{
+ struct sk_buff *fp, *head = fq->q.fragments;
+ int payload_len, delta;
+ u8 ecn;
+
+ inet_frag_kill(&fq->q);
+
+ WARN_ON(head == NULL);
+ WARN_ON(head->ip_defrag_offset != 0);
+
+ ecn = ip_frag_ecn_table[fq->ecn];
+ if (unlikely(ecn == 0xff))
+ return false;
+
+ /* Unfragmented part is taken from the first segment. */
+ payload_len = ((head->data - skb_network_header(head)) -
+ sizeof(struct ipv6hdr) + fq->q.len -
+ sizeof(struct frag_hdr));
+ if (payload_len > IPV6_MAXPLEN) {
+ net_dbg_ratelimited("nf_ct_frag6_reasm: payload len = %d\n",
+ payload_len);
+ return false;
+ }
+
+ delta = - head->truesize;
+
+ /* Head of list must not be cloned. */
+ if (skb_unclone(head, GFP_ATOMIC))
+ return false;
+
+ delta += head->truesize;
+ if (delta)
+ add_frag_mem_limit(fq->q.net, delta);
+
+ /* If the first fragment is fragmented itself, we split
+ * it to two chunks: the first with data and paged part
+ * and the second, holding only fragments. */
+ if (skb_has_frag_list(head)) {
+ struct sk_buff *clone;
+ int i, plen = 0;
+
+ clone = alloc_skb(0, GFP_ATOMIC);
+ if (clone == NULL)
+ return false;
+
+ clone->next = head->next;
+ head->next = clone;
+ skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
+ skb_frag_list_init(head);
+ for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
+ plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
+ clone->len = clone->data_len = head->data_len - plen;
+ head->data_len -= clone->len;
+ head->len -= clone->len;
+ clone->csum = 0;
+ clone->ip_summed = head->ip_summed;
+
+ add_frag_mem_limit(fq->q.net, clone->truesize);
+ }
+
+ /* morph head into last received skb: prev.
+ *
+ * This allows callers of ipv6 conntrack defrag to continue
+ * to use the last skb(frag) passed into the reasm engine.
+ * The last skb frag 'silently' turns into the full reassembled skb.
+ *
+ * Since prev is also part of q->fragments we have to clone it first.
+ */
+ if (head != prev) {
+ struct sk_buff *iter;
+
+ fp = skb_clone(prev, GFP_ATOMIC);
+ if (!fp)
+ return false;
+
+ fp->next = prev->next;
+
+ iter = head;
+ while (iter) {
+ if (iter->next == prev) {
+ iter->next = fp;
+ break;
+ }
+ iter = iter->next;
+ }
+
+ skb_morph(prev, head);
+ prev->next = head->next;
+ consume_skb(head);
+ head = prev;
+ }
+
+ /* We have to remove fragment header from datagram and to relocate
+ * header in order to calculate ICV correctly. */
+ skb_network_header(head)[fq->nhoffset] = skb_transport_header(head)[0];
+ memmove(head->head + sizeof(struct frag_hdr), head->head,
+ (head->data - head->head) - sizeof(struct frag_hdr));
+ head->mac_header += sizeof(struct frag_hdr);
+ head->network_header += sizeof(struct frag_hdr);
+
+ skb_shinfo(head)->frag_list = head->next;
+ skb_reset_transport_header(head);
+ skb_push(head, head->data - skb_network_header(head));
+
+ for (fp = head->next; fp; fp = fp->next) {
+ head->data_len += fp->len;
+ head->len += fp->len;
+ if (head->ip_summed != fp->ip_summed)
+ head->ip_summed = CHECKSUM_NONE;
+ else if (head->ip_summed == CHECKSUM_COMPLETE)
+ head->csum = csum_add(head->csum, fp->csum);
+ head->truesize += fp->truesize;
+ fp->sk = NULL;
+ }
+ sub_frag_mem_limit(fq->q.net, head->truesize);
+
+ head->ignore_df = 1;
+ head->next = NULL;
+ head->dev = dev;
+ head->tstamp = fq->q.stamp;
+ ipv6_hdr(head)->payload_len = htons(payload_len);
+ ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn);
+ IP6CB(head)->frag_max_size = sizeof(struct ipv6hdr) + fq->q.max_size;
+
+ /* Yes, and fold redundant checksum back. 8) */
+ if (head->ip_summed == CHECKSUM_COMPLETE)
+ head->csum = csum_partial(skb_network_header(head),
+ skb_network_header_len(head),
+ head->csum);
+
+ fq->q.fragments = NULL;
+ fq->q.rb_fragments = RB_ROOT;
+ fq->q.fragments_tail = NULL;
+
+ return true;
+}
+
+/*
+ * find the header just before Fragment Header.
+ *
+ * if success return 0 and set ...
+ * (*prevhdrp): the value of "Next Header Field" in the header
+ * just before Fragment Header.
+ * (*prevhoff): the offset of "Next Header Field" in the header
+ * just before Fragment Header.
+ * (*fhoff) : the offset of Fragment Header.
+ *
+ * Based on ipv6_skip_hdr() in net/ipv6/exthdr.c
+ *
+ */
+static int
+find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff)
+{
+ u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+ const int netoff = skb_network_offset(skb);
+ u8 prev_nhoff = netoff + offsetof(struct ipv6hdr, nexthdr);
+ int start = netoff + sizeof(struct ipv6hdr);
+ int len = skb->len - start;
+ u8 prevhdr = NEXTHDR_IPV6;
+
+ while (nexthdr != NEXTHDR_FRAGMENT) {
+ struct ipv6_opt_hdr hdr;
+ int hdrlen;
+
+ if (!ipv6_ext_hdr(nexthdr)) {
+ return -1;
+ }
+ if (nexthdr == NEXTHDR_NONE) {
+ pr_debug("next header is none\n");
+ return -1;
+ }
+ if (len < (int)sizeof(struct ipv6_opt_hdr)) {
+ pr_debug("too short\n");
+ return -1;
+ }
+ if (skb_copy_bits(skb, start, &hdr, sizeof(hdr)))
+ BUG();
+ if (nexthdr == NEXTHDR_AUTH)
+ hdrlen = (hdr.hdrlen+2)<<2;
+ else
+ hdrlen = ipv6_optlen(&hdr);
+
+ prevhdr = nexthdr;
+ prev_nhoff = start;
+
+ nexthdr = hdr.nexthdr;
+ len -= hdrlen;
+ start += hdrlen;
+ }
+
+ if (len < 0)
+ return -1;
+
+ *prevhdrp = prevhdr;
+ *prevhoff = prev_nhoff;
+ *fhoff = start;
+
+ return 0;
+}
+
+int nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user)
+{
+ u16 savethdr = skb->transport_header;
+ struct net_device *dev = skb->dev;
+ int fhoff, nhoff, ret;
+ struct frag_hdr *fhdr;
+ struct frag_queue *fq;
+ struct ipv6hdr *hdr;
+ u8 prevhdr;
+
+ /* Jumbo payload inhibits frag. header */
+ if (ipv6_hdr(skb)->payload_len == 0) {
+ pr_debug("payload len = 0\n");
+ return 0;
+ }
+
+ if (find_prev_fhdr(skb, &prevhdr, &nhoff, &fhoff) < 0)
+ return 0;
+
+ if (!pskb_may_pull(skb, fhoff + sizeof(*fhdr)))
+ return -ENOMEM;
+
+ skb_set_transport_header(skb, fhoff);
+ hdr = ipv6_hdr(skb);
+ fhdr = (struct frag_hdr *)skb_transport_header(skb);
+
+ if (skb->len - skb_network_offset(skb) < IPV6_MIN_MTU &&
+ fhdr->frag_off & htons(IP6_MF))
+ return -EINVAL;
+
+ skb_orphan(skb);
+ fq = fq_find(net, fhdr->identification, user, hdr,
+ skb->dev ? skb->dev->ifindex : 0);
+ if (fq == NULL) {
+ pr_debug("Can't find and can't create new queue\n");
+ return -ENOMEM;
+ }
+
+ spin_lock_bh(&fq->q.lock);
+
+ ret = nf_ct_frag6_queue(fq, skb, fhdr, nhoff);
+ if (ret < 0) {
+ if (ret == -EPROTO) {
+ skb->transport_header = savethdr;
+ ret = 0;
+ }
+ goto out_unlock;
+ }
+
+ /* after queue has assumed skb ownership, only 0 or -EINPROGRESS
+ * must be returned.
+ */
+ ret = -EINPROGRESS;
+ if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
+ fq->q.meat == fq->q.len) {
+ unsigned long orefdst = skb->_skb_refdst;
+
+ skb->_skb_refdst = 0UL;
+ if (nf_ct_frag6_reasm(fq, skb, dev))
+ ret = 0;
+ skb->_skb_refdst = orefdst;
+ } else {
+ skb_dst_drop(skb);
+ }
+
+out_unlock:
+ spin_unlock_bh(&fq->q.lock);
+ inet_frag_put(&fq->q);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_ct_frag6_gather);
+
+static int nf_ct_net_init(struct net *net)
+{
+ int res;
+
+ net->nf_frag.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
+ net->nf_frag.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
+ net->nf_frag.frags.timeout = IPV6_FRAG_TIMEOUT;
+ net->nf_frag.frags.f = &nf_frags;
+
+ res = inet_frags_init_net(&net->nf_frag.frags);
+ if (res < 0)
+ return res;
+ res = nf_ct_frag6_sysctl_register(net);
+ if (res < 0)
+ inet_frags_exit_net(&net->nf_frag.frags);
+ return res;
+}
+
+static void nf_ct_net_exit(struct net *net)
+{
+ nf_ct_frags6_sysctl_unregister(net);
+ inet_frags_exit_net(&net->nf_frag.frags);
+}
+
+static struct pernet_operations nf_ct_net_ops = {
+ .init = nf_ct_net_init,
+ .exit = nf_ct_net_exit,
+};
+
+static const struct rhashtable_params nfct_rhash_params = {
+ .head_offset = offsetof(struct inet_frag_queue, node),
+ .hashfn = ip6frag_key_hashfn,
+ .obj_hashfn = ip6frag_obj_hashfn,
+ .obj_cmpfn = ip6frag_obj_cmpfn,
+ .automatic_shrinking = true,
+};
+
+int nf_ct_frag6_init(void)
+{
+ int ret = 0;
+
+ nf_frags.constructor = ip6frag_init;
+ nf_frags.destructor = NULL;
+ nf_frags.qsize = sizeof(struct frag_queue);
+ nf_frags.frag_expire = nf_ct_frag6_expire;
+ nf_frags.frags_cache_name = nf_frags_cache_name;
+ nf_frags.rhash_params = nfct_rhash_params;
+ ret = inet_frags_init(&nf_frags);
+ if (ret)
+ goto out;
+ ret = register_pernet_subsys(&nf_ct_net_ops);
+ if (ret)
+ inet_frags_fini(&nf_frags);
+
+out:
+ return ret;
+}
+
+void nf_ct_frag6_cleanup(void)
+{
+ unregister_pernet_subsys(&nf_ct_net_ops);
+ inet_frags_fini(&nf_frags);
+}
diff --git a/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c b/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
new file mode 100644
index 0000000..72dd3e2
--- /dev/null
+++ b/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
@@ -0,0 +1,161 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/ipv6.h>
+#include <linux/in6.h>
+#include <linux/netfilter.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/icmp.h>
+#include <linux/sysctl.h>
+#include <net/ipv6_frag.h>
+
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter_bridge.h>
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_l4proto.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
+#endif
+#include <net/netfilter/nf_conntrack_zones.h>
+#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
+
+static DEFINE_MUTEX(defrag6_mutex);
+
+static enum ip6_defrag_users nf_ct6_defrag_user(unsigned int hooknum,
+ struct sk_buff *skb)
+{
+ u16 zone_id = NF_CT_DEFAULT_ZONE_ID;
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+ if (skb_nfct(skb)) {
+ enum ip_conntrack_info ctinfo;
+ const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+
+ zone_id = nf_ct_zone_id(nf_ct_zone(ct), CTINFO2DIR(ctinfo));
+ }
+#endif
+ if (nf_bridge_in_prerouting(skb))
+ return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone_id;
+
+ if (hooknum == NF_INET_PRE_ROUTING)
+ return IP6_DEFRAG_CONNTRACK_IN + zone_id;
+ else
+ return IP6_DEFRAG_CONNTRACK_OUT + zone_id;
+}
+
+static unsigned int ipv6_defrag(void *priv,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ int err;
+
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+ /* Previously seen (loopback)? */
+ if (skb_nfct(skb) && !nf_ct_is_template((struct nf_conn *)skb_nfct(skb)))
+ return NF_ACCEPT;
+
+ if (skb->_nfct == IP_CT_UNTRACKED)
+ return NF_ACCEPT;
+#endif
+
+ err = nf_ct_frag6_gather(state->net, skb,
+ nf_ct6_defrag_user(state->hook, skb));
+ /* queued */
+ if (err == -EINPROGRESS)
+ return NF_STOLEN;
+
+ return err == 0 ? NF_ACCEPT : NF_DROP;
+}
+
+static const struct nf_hook_ops ipv6_defrag_ops[] = {
+ {
+ .hook = ipv6_defrag,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_PRE_ROUTING,
+ .priority = NF_IP6_PRI_CONNTRACK_DEFRAG,
+ },
+ {
+ .hook = ipv6_defrag,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP6_PRI_CONNTRACK_DEFRAG,
+ },
+};
+
+static void __net_exit defrag6_net_exit(struct net *net)
+{
+ if (net->nf.defrag_ipv6) {
+ nf_unregister_net_hooks(net, ipv6_defrag_ops,
+ ARRAY_SIZE(ipv6_defrag_ops));
+ net->nf.defrag_ipv6 = false;
+ }
+}
+
+static struct pernet_operations defrag6_net_ops = {
+ .exit = defrag6_net_exit,
+};
+
+static int __init nf_defrag_init(void)
+{
+ int ret = 0;
+
+ ret = nf_ct_frag6_init();
+ if (ret < 0) {
+ pr_err("nf_defrag_ipv6: can't initialize frag6.\n");
+ return ret;
+ }
+ ret = register_pernet_subsys(&defrag6_net_ops);
+ if (ret < 0) {
+ pr_err("nf_defrag_ipv6: can't register pernet ops\n");
+ goto cleanup_frag6;
+ }
+ return ret;
+
+cleanup_frag6:
+ nf_ct_frag6_cleanup();
+ return ret;
+
+}
+
+static void __exit nf_defrag_fini(void)
+{
+ unregister_pernet_subsys(&defrag6_net_ops);
+ nf_ct_frag6_cleanup();
+}
+
+int nf_defrag_ipv6_enable(struct net *net)
+{
+ int err = 0;
+
+ might_sleep();
+
+ if (net->nf.defrag_ipv6)
+ return 0;
+
+ mutex_lock(&defrag6_mutex);
+ if (net->nf.defrag_ipv6)
+ goto out_unlock;
+
+ err = nf_register_net_hooks(net, ipv6_defrag_ops,
+ ARRAY_SIZE(ipv6_defrag_ops));
+ if (err == 0)
+ net->nf.defrag_ipv6 = true;
+
+ out_unlock:
+ mutex_unlock(&defrag6_mutex);
+ return err;
+}
+EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable);
+
+module_init(nf_defrag_init);
+module_exit(nf_defrag_fini);
+
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/netfilter/nf_dup_ipv6.c b/net/ipv6/netfilter/nf_dup_ipv6.c
new file mode 100644
index 0000000..4a7dded
--- /dev/null
+++ b/net/ipv6/netfilter/nf_dup_ipv6.c
@@ -0,0 +1,81 @@
+/*
+ * (C) 2007 by Sebastian Claßen <sebastian.classen@freenet.ag>
+ * (C) 2007-2010 by Jan Engelhardt <jengelh@medozas.de>
+ *
+ * Extracted from xt_TEE.c
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 or later, as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/percpu.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/netfilter/ipv6/nf_dup_ipv6.h>
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+#include <net/netfilter/nf_conntrack.h>
+#endif
+
+static bool nf_dup_ipv6_route(struct net *net, struct sk_buff *skb,
+ const struct in6_addr *gw, int oif)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct dst_entry *dst;
+ struct flowi6 fl6;
+
+ memset(&fl6, 0, sizeof(fl6));
+ if (oif != -1)
+ fl6.flowi6_oif = oif;
+
+ fl6.daddr = *gw;
+ fl6.flowlabel = (__force __be32)(((iph->flow_lbl[0] & 0xF) << 16) |
+ (iph->flow_lbl[1] << 8) | iph->flow_lbl[2]);
+ fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH;
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (dst->error) {
+ dst_release(dst);
+ return false;
+ }
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst);
+ skb->dev = dst->dev;
+ skb->protocol = htons(ETH_P_IPV6);
+
+ return true;
+}
+
+void nf_dup_ipv6(struct net *net, struct sk_buff *skb, unsigned int hooknum,
+ const struct in6_addr *gw, int oif)
+{
+ if (this_cpu_read(nf_skb_duplicated))
+ return;
+ skb = pskb_copy(skb, GFP_ATOMIC);
+ if (skb == NULL)
+ return;
+
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+ nf_reset(skb);
+ nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
+#endif
+ if (hooknum == NF_INET_PRE_ROUTING ||
+ hooknum == NF_INET_LOCAL_IN) {
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ --iph->hop_limit;
+ }
+ if (nf_dup_ipv6_route(net, skb, gw, oif)) {
+ __this_cpu_write(nf_skb_duplicated, true);
+ ip6_local_out(net, skb->sk, skb);
+ __this_cpu_write(nf_skb_duplicated, false);
+ } else {
+ kfree_skb(skb);
+ }
+}
+EXPORT_SYMBOL_GPL(nf_dup_ipv6);
+
+MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>");
+MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
+MODULE_DESCRIPTION("nf_dup_ipv6: IPv6 packet duplication");
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/netfilter/nf_flow_table_ipv6.c b/net/ipv6/netfilter/nf_flow_table_ipv6.c
new file mode 100644
index 0000000..c511d20
--- /dev/null
+++ b/net/ipv6/netfilter/nf_flow_table_ipv6.c
@@ -0,0 +1,34 @@
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/rhashtable.h>
+#include <net/netfilter/nf_flow_table.h>
+#include <net/netfilter/nf_tables.h>
+
+static struct nf_flowtable_type flowtable_ipv6 = {
+ .family = NFPROTO_IPV6,
+ .init = nf_flow_table_init,
+ .free = nf_flow_table_free,
+ .hook = nf_flow_offload_ipv6_hook,
+ .owner = THIS_MODULE,
+};
+
+static int __init nf_flow_ipv6_module_init(void)
+{
+ nft_register_flowtable_type(&flowtable_ipv6);
+
+ return 0;
+}
+
+static void __exit nf_flow_ipv6_module_exit(void)
+{
+ nft_unregister_flowtable_type(&flowtable_ipv6);
+}
+
+module_init(nf_flow_ipv6_module_init);
+module_exit(nf_flow_ipv6_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_ALIAS_NF_FLOWTABLE(AF_INET6);
diff --git a/net/ipv6/netfilter/nf_log_ipv6.c b/net/ipv6/netfilter/nf_log_ipv6.c
new file mode 100644
index 0000000..c6bf580
--- /dev/null
+++ b/net/ipv6/netfilter/nf_log_ipv6.c
@@ -0,0 +1,428 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/ip.h>
+#include <net/ipv6.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+#include <net/route.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter/xt_LOG.h>
+#include <net/netfilter/nf_log.h>
+
+static const struct nf_loginfo default_loginfo = {
+ .type = NF_LOG_TYPE_LOG,
+ .u = {
+ .log = {
+ .level = LOGLEVEL_NOTICE,
+ .logflags = NF_LOG_DEFAULT_MASK,
+ },
+ },
+};
+
+/* One level of recursion won't kill us */
+static void dump_ipv6_packet(struct net *net, struct nf_log_buf *m,
+ const struct nf_loginfo *info,
+ const struct sk_buff *skb, unsigned int ip6hoff,
+ int recurse)
+{
+ u_int8_t currenthdr;
+ int fragment;
+ struct ipv6hdr _ip6h;
+ const struct ipv6hdr *ih;
+ unsigned int ptr;
+ unsigned int hdrlen = 0;
+ unsigned int logflags;
+
+ if (info->type == NF_LOG_TYPE_LOG)
+ logflags = info->u.log.logflags;
+ else
+ logflags = NF_LOG_DEFAULT_MASK;
+
+ ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
+ if (ih == NULL) {
+ nf_log_buf_add(m, "TRUNCATED");
+ return;
+ }
+
+ /* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
+ nf_log_buf_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
+
+ /* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
+ nf_log_buf_add(m, "LEN=%zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
+ ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
+ (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
+ ih->hop_limit,
+ (ntohl(*(__be32 *)ih) & 0x000fffff));
+
+ fragment = 0;
+ ptr = ip6hoff + sizeof(struct ipv6hdr);
+ currenthdr = ih->nexthdr;
+ while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
+ struct ipv6_opt_hdr _hdr;
+ const struct ipv6_opt_hdr *hp;
+
+ hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
+ if (hp == NULL) {
+ nf_log_buf_add(m, "TRUNCATED");
+ return;
+ }
+
+ /* Max length: 48 "OPT (...) " */
+ if (logflags & NF_LOG_IPOPT)
+ nf_log_buf_add(m, "OPT ( ");
+
+ switch (currenthdr) {
+ case IPPROTO_FRAGMENT: {
+ struct frag_hdr _fhdr;
+ const struct frag_hdr *fh;
+
+ nf_log_buf_add(m, "FRAG:");
+ fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
+ &_fhdr);
+ if (fh == NULL) {
+ nf_log_buf_add(m, "TRUNCATED ");
+ return;
+ }
+
+ /* Max length: 6 "65535 " */
+ nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
+
+ /* Max length: 11 "INCOMPLETE " */
+ if (fh->frag_off & htons(0x0001))
+ nf_log_buf_add(m, "INCOMPLETE ");
+
+ nf_log_buf_add(m, "ID:%08x ",
+ ntohl(fh->identification));
+
+ if (ntohs(fh->frag_off) & 0xFFF8)
+ fragment = 1;
+
+ hdrlen = 8;
+
+ break;
+ }
+ case IPPROTO_DSTOPTS:
+ case IPPROTO_ROUTING:
+ case IPPROTO_HOPOPTS:
+ if (fragment) {
+ if (logflags & NF_LOG_IPOPT)
+ nf_log_buf_add(m, ")");
+ return;
+ }
+ hdrlen = ipv6_optlen(hp);
+ break;
+ /* Max Length */
+ case IPPROTO_AH:
+ if (logflags & NF_LOG_IPOPT) {
+ struct ip_auth_hdr _ahdr;
+ const struct ip_auth_hdr *ah;
+
+ /* Max length: 3 "AH " */
+ nf_log_buf_add(m, "AH ");
+
+ if (fragment) {
+ nf_log_buf_add(m, ")");
+ return;
+ }
+
+ ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
+ &_ahdr);
+ if (ah == NULL) {
+ /*
+ * Max length: 26 "INCOMPLETE [65535
+ * bytes] )"
+ */
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
+ skb->len - ptr);
+ return;
+ }
+
+ /* Length: 15 "SPI=0xF1234567 */
+ nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi));
+
+ }
+
+ hdrlen = (hp->hdrlen+2)<<2;
+ break;
+ case IPPROTO_ESP:
+ if (logflags & NF_LOG_IPOPT) {
+ struct ip_esp_hdr _esph;
+ const struct ip_esp_hdr *eh;
+
+ /* Max length: 4 "ESP " */
+ nf_log_buf_add(m, "ESP ");
+
+ if (fragment) {
+ nf_log_buf_add(m, ")");
+ return;
+ }
+
+ /*
+ * Max length: 26 "INCOMPLETE [65535 bytes] )"
+ */
+ eh = skb_header_pointer(skb, ptr, sizeof(_esph),
+ &_esph);
+ if (eh == NULL) {
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
+ skb->len - ptr);
+ return;
+ }
+
+ /* Length: 16 "SPI=0xF1234567 )" */
+ nf_log_buf_add(m, "SPI=0x%x )",
+ ntohl(eh->spi));
+ }
+ return;
+ default:
+ /* Max length: 20 "Unknown Ext Hdr 255" */
+ nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr);
+ return;
+ }
+ if (logflags & NF_LOG_IPOPT)
+ nf_log_buf_add(m, ") ");
+
+ currenthdr = hp->nexthdr;
+ ptr += hdrlen;
+ }
+
+ switch (currenthdr) {
+ case IPPROTO_TCP:
+ if (nf_log_dump_tcp_header(m, skb, currenthdr, fragment,
+ ptr, logflags))
+ return;
+ break;
+ case IPPROTO_UDP:
+ case IPPROTO_UDPLITE:
+ if (nf_log_dump_udp_header(m, skb, currenthdr, fragment, ptr))
+ return;
+ break;
+ case IPPROTO_ICMPV6: {
+ struct icmp6hdr _icmp6h;
+ const struct icmp6hdr *ic;
+
+ /* Max length: 13 "PROTO=ICMPv6 " */
+ nf_log_buf_add(m, "PROTO=ICMPv6 ");
+
+ if (fragment)
+ break;
+
+ /* Max length: 25 "INCOMPLETE [65535 bytes] " */
+ ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
+ if (ic == NULL) {
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
+ skb->len - ptr);
+ return;
+ }
+
+ /* Max length: 18 "TYPE=255 CODE=255 " */
+ nf_log_buf_add(m, "TYPE=%u CODE=%u ",
+ ic->icmp6_type, ic->icmp6_code);
+
+ switch (ic->icmp6_type) {
+ case ICMPV6_ECHO_REQUEST:
+ case ICMPV6_ECHO_REPLY:
+ /* Max length: 19 "ID=65535 SEQ=65535 " */
+ nf_log_buf_add(m, "ID=%u SEQ=%u ",
+ ntohs(ic->icmp6_identifier),
+ ntohs(ic->icmp6_sequence));
+ break;
+ case ICMPV6_MGM_QUERY:
+ case ICMPV6_MGM_REPORT:
+ case ICMPV6_MGM_REDUCTION:
+ break;
+
+ case ICMPV6_PARAMPROB:
+ /* Max length: 17 "POINTER=ffffffff " */
+ nf_log_buf_add(m, "POINTER=%08x ",
+ ntohl(ic->icmp6_pointer));
+ /* Fall through */
+ case ICMPV6_DEST_UNREACH:
+ case ICMPV6_PKT_TOOBIG:
+ case ICMPV6_TIME_EXCEED:
+ /* Max length: 3+maxlen */
+ if (recurse) {
+ nf_log_buf_add(m, "[");
+ dump_ipv6_packet(net, m, info, skb,
+ ptr + sizeof(_icmp6h), 0);
+ nf_log_buf_add(m, "] ");
+ }
+
+ /* Max length: 10 "MTU=65535 " */
+ if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) {
+ nf_log_buf_add(m, "MTU=%u ",
+ ntohl(ic->icmp6_mtu));
+ }
+ }
+ break;
+ }
+ /* Max length: 10 "PROTO=255 " */
+ default:
+ nf_log_buf_add(m, "PROTO=%u ", currenthdr);
+ }
+
+ /* Max length: 15 "UID=4294967295 " */
+ if ((logflags & NF_LOG_UID) && recurse)
+ nf_log_dump_sk_uid_gid(net, m, skb->sk);
+
+ /* Max length: 16 "MARK=0xFFFFFFFF " */
+ if (recurse && skb->mark)
+ nf_log_buf_add(m, "MARK=0x%x ", skb->mark);
+}
+
+static void dump_ipv6_mac_header(struct nf_log_buf *m,
+ const struct nf_loginfo *info,
+ const struct sk_buff *skb)
+{
+ struct net_device *dev = skb->dev;
+ unsigned int logflags = 0;
+
+ if (info->type == NF_LOG_TYPE_LOG)
+ logflags = info->u.log.logflags;
+
+ if (!(logflags & NF_LOG_MACDECODE))
+ goto fallback;
+
+ switch (dev->type) {
+ case ARPHRD_ETHER:
+ nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
+ eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
+ ntohs(eth_hdr(skb)->h_proto));
+ return;
+ default:
+ break;
+ }
+
+fallback:
+ nf_log_buf_add(m, "MAC=");
+ if (dev->hard_header_len &&
+ skb->mac_header != skb->network_header) {
+ const unsigned char *p = skb_mac_header(skb);
+ unsigned int len = dev->hard_header_len;
+ unsigned int i;
+
+ if (dev->type == ARPHRD_SIT) {
+ p -= ETH_HLEN;
+
+ if (p < skb->head)
+ p = NULL;
+ }
+
+ if (p != NULL) {
+ nf_log_buf_add(m, "%02x", *p++);
+ for (i = 1; i < len; i++)
+ nf_log_buf_add(m, ":%02x", *p++);
+ }
+ nf_log_buf_add(m, " ");
+
+ if (dev->type == ARPHRD_SIT) {
+ const struct iphdr *iph =
+ (struct iphdr *)skb_mac_header(skb);
+ nf_log_buf_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr,
+ &iph->daddr);
+ }
+ } else {
+ nf_log_buf_add(m, " ");
+ }
+}
+
+static void nf_log_ip6_packet(struct net *net, u_int8_t pf,
+ unsigned int hooknum, const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const struct nf_loginfo *loginfo,
+ const char *prefix)
+{
+ struct nf_log_buf *m;
+
+ /* FIXME: Disabled from containers until syslog ns is supported */
+ if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
+ return;
+
+ m = nf_log_buf_open();
+
+ if (!loginfo)
+ loginfo = &default_loginfo;
+
+ nf_log_dump_packet_common(m, pf, hooknum, skb, in, out,
+ loginfo, prefix);
+
+ if (in != NULL)
+ dump_ipv6_mac_header(m, loginfo, skb);
+
+ dump_ipv6_packet(net, m, loginfo, skb, skb_network_offset(skb), 1);
+
+ nf_log_buf_close(m);
+}
+
+static struct nf_logger nf_ip6_logger __read_mostly = {
+ .name = "nf_log_ipv6",
+ .type = NF_LOG_TYPE_LOG,
+ .logfn = nf_log_ip6_packet,
+ .me = THIS_MODULE,
+};
+
+static int __net_init nf_log_ipv6_net_init(struct net *net)
+{
+ return nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger);
+}
+
+static void __net_exit nf_log_ipv6_net_exit(struct net *net)
+{
+ nf_log_unset(net, &nf_ip6_logger);
+}
+
+static struct pernet_operations nf_log_ipv6_net_ops = {
+ .init = nf_log_ipv6_net_init,
+ .exit = nf_log_ipv6_net_exit,
+};
+
+static int __init nf_log_ipv6_init(void)
+{
+ int ret;
+
+ ret = register_pernet_subsys(&nf_log_ipv6_net_ops);
+ if (ret < 0)
+ return ret;
+
+ ret = nf_log_register(NFPROTO_IPV6, &nf_ip6_logger);
+ if (ret < 0) {
+ pr_err("failed to register logger\n");
+ goto err1;
+ }
+
+ return 0;
+
+err1:
+ unregister_pernet_subsys(&nf_log_ipv6_net_ops);
+ return ret;
+}
+
+static void __exit nf_log_ipv6_exit(void)
+{
+ unregister_pernet_subsys(&nf_log_ipv6_net_ops);
+ nf_log_unregister(&nf_ip6_logger);
+}
+
+module_init(nf_log_ipv6_init);
+module_exit(nf_log_ipv6_exit);
+
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("Netfilter IPv6 packet logging");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NF_LOGGER(AF_INET6, 0);
diff --git a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
new file mode 100644
index 0000000..ca6d386
--- /dev/null
+++ b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
@@ -0,0 +1,444 @@
+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Development of IPv6 NAT funded by Astaro.
+ */
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <net/secure_seq.h>
+#include <net/checksum.h>
+#include <net/ip6_checksum.h>
+#include <net/ip6_route.h>
+#include <net/ipv6.h>
+
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/netfilter/nf_nat_l4proto.h>
+
+static const struct nf_nat_l3proto nf_nat_l3proto_ipv6;
+
+#ifdef CONFIG_XFRM
+static void nf_nat_ipv6_decode_session(struct sk_buff *skb,
+ const struct nf_conn *ct,
+ enum ip_conntrack_dir dir,
+ unsigned long statusbit,
+ struct flowi *fl)
+{
+ const struct nf_conntrack_tuple *t = &ct->tuplehash[dir].tuple;
+ struct flowi6 *fl6 = &fl->u.ip6;
+
+ if (ct->status & statusbit) {
+ fl6->daddr = t->dst.u3.in6;
+ if (t->dst.protonum == IPPROTO_TCP ||
+ t->dst.protonum == IPPROTO_UDP ||
+ t->dst.protonum == IPPROTO_UDPLITE ||
+ t->dst.protonum == IPPROTO_DCCP ||
+ t->dst.protonum == IPPROTO_SCTP)
+ fl6->fl6_dport = t->dst.u.all;
+ }
+
+ statusbit ^= IPS_NAT_MASK;
+
+ if (ct->status & statusbit) {
+ fl6->saddr = t->src.u3.in6;
+ if (t->dst.protonum == IPPROTO_TCP ||
+ t->dst.protonum == IPPROTO_UDP ||
+ t->dst.protonum == IPPROTO_UDPLITE ||
+ t->dst.protonum == IPPROTO_DCCP ||
+ t->dst.protonum == IPPROTO_SCTP)
+ fl6->fl6_sport = t->src.u.all;
+ }
+}
+#endif
+
+static bool nf_nat_ipv6_in_range(const struct nf_conntrack_tuple *t,
+ const struct nf_nat_range2 *range)
+{
+ return ipv6_addr_cmp(&t->src.u3.in6, &range->min_addr.in6) >= 0 &&
+ ipv6_addr_cmp(&t->src.u3.in6, &range->max_addr.in6) <= 0;
+}
+
+static u32 nf_nat_ipv6_secure_port(const struct nf_conntrack_tuple *t,
+ __be16 dport)
+{
+ return secure_ipv6_port_ephemeral(t->src.u3.ip6, t->dst.u3.ip6, dport);
+}
+
+static bool nf_nat_ipv6_manip_pkt(struct sk_buff *skb,
+ unsigned int iphdroff,
+ const struct nf_nat_l4proto *l4proto,
+ const struct nf_conntrack_tuple *target,
+ enum nf_nat_manip_type maniptype)
+{
+ struct ipv6hdr *ipv6h;
+ __be16 frag_off;
+ int hdroff;
+ u8 nexthdr;
+
+ if (!skb_make_writable(skb, iphdroff + sizeof(*ipv6h)))
+ return false;
+
+ ipv6h = (void *)skb->data + iphdroff;
+ nexthdr = ipv6h->nexthdr;
+ hdroff = ipv6_skip_exthdr(skb, iphdroff + sizeof(*ipv6h),
+ &nexthdr, &frag_off);
+ if (hdroff < 0)
+ goto manip_addr;
+
+ if ((frag_off & htons(~0x7)) == 0 &&
+ !l4proto->manip_pkt(skb, &nf_nat_l3proto_ipv6, iphdroff, hdroff,
+ target, maniptype))
+ return false;
+
+ /* must reload, offset might have changed */
+ ipv6h = (void *)skb->data + iphdroff;
+
+manip_addr:
+ if (maniptype == NF_NAT_MANIP_SRC)
+ ipv6h->saddr = target->src.u3.in6;
+ else
+ ipv6h->daddr = target->dst.u3.in6;
+
+ return true;
+}
+
+static void nf_nat_ipv6_csum_update(struct sk_buff *skb,
+ unsigned int iphdroff, __sum16 *check,
+ const struct nf_conntrack_tuple *t,
+ enum nf_nat_manip_type maniptype)
+{
+ const struct ipv6hdr *ipv6h = (struct ipv6hdr *)(skb->data + iphdroff);
+ const struct in6_addr *oldip, *newip;
+
+ if (maniptype == NF_NAT_MANIP_SRC) {
+ oldip = &ipv6h->saddr;
+ newip = &t->src.u3.in6;
+ } else {
+ oldip = &ipv6h->daddr;
+ newip = &t->dst.u3.in6;
+ }
+ inet_proto_csum_replace16(check, skb, oldip->s6_addr32,
+ newip->s6_addr32, true);
+}
+
+static void nf_nat_ipv6_csum_recalc(struct sk_buff *skb,
+ u8 proto, void *data, __sum16 *check,
+ int datalen, int oldlen)
+{
+ if (skb->ip_summed != CHECKSUM_PARTIAL) {
+ const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ skb->csum_start = skb_headroom(skb) + skb_network_offset(skb) +
+ (data - (void *)skb->data);
+ skb->csum_offset = (void *)check - data;
+ *check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr,
+ datalen, proto, 0);
+ } else
+ inet_proto_csum_replace2(check, skb,
+ htons(oldlen), htons(datalen), true);
+}
+
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+static int nf_nat_ipv6_nlattr_to_range(struct nlattr *tb[],
+ struct nf_nat_range2 *range)
+{
+ if (tb[CTA_NAT_V6_MINIP]) {
+ nla_memcpy(&range->min_addr.ip6, tb[CTA_NAT_V6_MINIP],
+ sizeof(struct in6_addr));
+ range->flags |= NF_NAT_RANGE_MAP_IPS;
+ }
+
+ if (tb[CTA_NAT_V6_MAXIP])
+ nla_memcpy(&range->max_addr.ip6, tb[CTA_NAT_V6_MAXIP],
+ sizeof(struct in6_addr));
+ else
+ range->max_addr = range->min_addr;
+
+ return 0;
+}
+#endif
+
+static const struct nf_nat_l3proto nf_nat_l3proto_ipv6 = {
+ .l3proto = NFPROTO_IPV6,
+ .secure_port = nf_nat_ipv6_secure_port,
+ .in_range = nf_nat_ipv6_in_range,
+ .manip_pkt = nf_nat_ipv6_manip_pkt,
+ .csum_update = nf_nat_ipv6_csum_update,
+ .csum_recalc = nf_nat_ipv6_csum_recalc,
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+ .nlattr_to_range = nf_nat_ipv6_nlattr_to_range,
+#endif
+#ifdef CONFIG_XFRM
+ .decode_session = nf_nat_ipv6_decode_session,
+#endif
+};
+
+int nf_nat_icmpv6_reply_translation(struct sk_buff *skb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned int hooknum,
+ unsigned int hdrlen)
+{
+ struct {
+ struct icmp6hdr icmp6;
+ struct ipv6hdr ip6;
+ } *inside;
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+ enum nf_nat_manip_type manip = HOOK2MANIP(hooknum);
+ const struct nf_nat_l4proto *l4proto;
+ struct nf_conntrack_tuple target;
+ unsigned long statusbit;
+
+ WARN_ON(ctinfo != IP_CT_RELATED && ctinfo != IP_CT_RELATED_REPLY);
+
+ if (!skb_make_writable(skb, hdrlen + sizeof(*inside)))
+ return 0;
+ if (nf_ip6_checksum(skb, hooknum, hdrlen, IPPROTO_ICMPV6))
+ return 0;
+
+ inside = (void *)skb->data + hdrlen;
+ if (inside->icmp6.icmp6_type == NDISC_REDIRECT) {
+ if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
+ return 0;
+ if (ct->status & IPS_NAT_MASK)
+ return 0;
+ }
+
+ if (manip == NF_NAT_MANIP_SRC)
+ statusbit = IPS_SRC_NAT;
+ else
+ statusbit = IPS_DST_NAT;
+
+ /* Invert if this is reply direction */
+ if (dir == IP_CT_DIR_REPLY)
+ statusbit ^= IPS_NAT_MASK;
+
+ if (!(ct->status & statusbit))
+ return 1;
+
+ l4proto = __nf_nat_l4proto_find(NFPROTO_IPV6, inside->ip6.nexthdr);
+ if (!nf_nat_ipv6_manip_pkt(skb, hdrlen + sizeof(inside->icmp6),
+ l4proto, &ct->tuplehash[!dir].tuple, !manip))
+ return 0;
+
+ if (skb->ip_summed != CHECKSUM_PARTIAL) {
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ inside = (void *)skb->data + hdrlen;
+ inside->icmp6.icmp6_cksum = 0;
+ inside->icmp6.icmp6_cksum =
+ csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr,
+ skb->len - hdrlen, IPPROTO_ICMPV6,
+ skb_checksum(skb, hdrlen,
+ skb->len - hdrlen, 0));
+ }
+
+ nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
+ l4proto = __nf_nat_l4proto_find(NFPROTO_IPV6, IPPROTO_ICMPV6);
+ if (!nf_nat_ipv6_manip_pkt(skb, 0, l4proto, &target, manip))
+ return 0;
+
+ return 1;
+}
+EXPORT_SYMBOL_GPL(nf_nat_icmpv6_reply_translation);
+
+static unsigned int
+nf_nat_ipv6_fn(void *priv, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+ __be16 frag_off;
+ int hdrlen;
+ u8 nexthdr;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ /* Can't track? It's not due to stress, or conntrack would
+ * have dropped it. Hence it's the user's responsibilty to
+ * packet filter it out, or implement conntrack/NAT for that
+ * protocol. 8) --RR
+ */
+ if (!ct)
+ return NF_ACCEPT;
+
+ if (ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY) {
+ nexthdr = ipv6_hdr(skb)->nexthdr;
+ hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
+ &nexthdr, &frag_off);
+
+ if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
+ if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo,
+ state->hook,
+ hdrlen))
+ return NF_DROP;
+ else
+ return NF_ACCEPT;
+ }
+ }
+
+ return nf_nat_inet_fn(priv, skb, state);
+}
+
+static unsigned int
+nf_nat_ipv6_in(void *priv, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ unsigned int ret;
+ struct in6_addr daddr = ipv6_hdr(skb)->daddr;
+
+ ret = nf_nat_ipv6_fn(priv, skb, state);
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr))
+ skb_dst_drop(skb);
+
+ return ret;
+}
+
+static unsigned int
+nf_nat_ipv6_out(void *priv, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+#ifdef CONFIG_XFRM
+ const struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+ int err;
+#endif
+ unsigned int ret;
+
+ ret = nf_nat_ipv6_fn(priv, skb, state);
+#ifdef CONFIG_XFRM
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ !(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
+ (ct = nf_ct_get(skb, &ctinfo)) != NULL) {
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+
+ if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
+ &ct->tuplehash[!dir].tuple.dst.u3) ||
+ (ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 &&
+ ct->tuplehash[dir].tuple.src.u.all !=
+ ct->tuplehash[!dir].tuple.dst.u.all)) {
+ err = nf_xfrm_me_harder(state->net, skb, AF_INET6);
+ if (err < 0)
+ ret = NF_DROP_ERR(err);
+ }
+ }
+#endif
+ return ret;
+}
+
+static unsigned int
+nf_nat_ipv6_local_fn(void *priv, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ const struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+ unsigned int ret;
+ int err;
+
+ ret = nf_nat_ipv6_fn(priv, skb, state);
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ (ct = nf_ct_get(skb, &ctinfo)) != NULL) {
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+
+ if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
+ &ct->tuplehash[!dir].tuple.src.u3)) {
+ err = ip6_route_me_harder(state->net, skb);
+ if (err < 0)
+ ret = NF_DROP_ERR(err);
+ }
+#ifdef CONFIG_XFRM
+ else if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
+ ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 &&
+ ct->tuplehash[dir].tuple.dst.u.all !=
+ ct->tuplehash[!dir].tuple.src.u.all) {
+ err = nf_xfrm_me_harder(state->net, skb, AF_INET6);
+ if (err < 0)
+ ret = NF_DROP_ERR(err);
+ }
+#endif
+ }
+ return ret;
+}
+
+static const struct nf_hook_ops nf_nat_ipv6_ops[] = {
+ /* Before packet filtering, change destination */
+ {
+ .hook = nf_nat_ipv6_in,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_PRE_ROUTING,
+ .priority = NF_IP6_PRI_NAT_DST,
+ },
+ /* After packet filtering, change source */
+ {
+ .hook = nf_nat_ipv6_out,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_POST_ROUTING,
+ .priority = NF_IP6_PRI_NAT_SRC,
+ },
+ /* Before packet filtering, change destination */
+ {
+ .hook = nf_nat_ipv6_local_fn,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP6_PRI_NAT_DST,
+ },
+ /* After packet filtering, change source */
+ {
+ .hook = nf_nat_ipv6_fn,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = NF_IP6_PRI_NAT_SRC,
+ },
+};
+
+int nf_nat_l3proto_ipv6_register_fn(struct net *net, const struct nf_hook_ops *ops)
+{
+ return nf_nat_register_fn(net, ops, nf_nat_ipv6_ops, ARRAY_SIZE(nf_nat_ipv6_ops));
+}
+EXPORT_SYMBOL_GPL(nf_nat_l3proto_ipv6_register_fn);
+
+void nf_nat_l3proto_ipv6_unregister_fn(struct net *net, const struct nf_hook_ops *ops)
+{
+ nf_nat_unregister_fn(net, ops, ARRAY_SIZE(nf_nat_ipv6_ops));
+}
+EXPORT_SYMBOL_GPL(nf_nat_l3proto_ipv6_unregister_fn);
+
+static int __init nf_nat_l3proto_ipv6_init(void)
+{
+ int err;
+
+ err = nf_nat_l4proto_register(NFPROTO_IPV6, &nf_nat_l4proto_icmpv6);
+ if (err < 0)
+ goto err1;
+ err = nf_nat_l3proto_register(&nf_nat_l3proto_ipv6);
+ if (err < 0)
+ goto err2;
+ return err;
+
+err2:
+ nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_icmpv6);
+err1:
+ return err;
+}
+
+static void __exit nf_nat_l3proto_ipv6_exit(void)
+{
+ nf_nat_l3proto_unregister(&nf_nat_l3proto_ipv6);
+ nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_icmpv6);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("nf-nat-" __stringify(AF_INET6));
+
+module_init(nf_nat_l3proto_ipv6_init);
+module_exit(nf_nat_l3proto_ipv6_exit);
diff --git a/net/ipv6/netfilter/nf_nat_masquerade_ipv6.c b/net/ipv6/netfilter/nf_nat_masquerade_ipv6.c
new file mode 100644
index 0000000..37b1d41
--- /dev/null
+++ b/net/ipv6/netfilter/nf_nat_masquerade_ipv6.c
@@ -0,0 +1,210 @@
+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Based on Rusty Russell's IPv6 MASQUERADE target. Development of IPv6
+ * NAT funded by Astaro.
+ */
+
+#include <linux/kernel.h>
+#include <linux/atomic.h>
+#include <linux/netdevice.h>
+#include <linux/ipv6.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/addrconf.h>
+#include <net/ipv6.h>
+#include <net/netfilter/ipv6/nf_nat_masquerade.h>
+
+#define MAX_WORK_COUNT 16
+
+static atomic_t v6_worker_count;
+
+unsigned int
+nf_nat_masquerade_ipv6(struct sk_buff *skb, const struct nf_nat_range2 *range,
+ const struct net_device *out)
+{
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn_nat *nat;
+ struct in6_addr src;
+ struct nf_conn *ct;
+ struct nf_nat_range2 newrange;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ WARN_ON(!(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
+ ctinfo == IP_CT_RELATED_REPLY)));
+
+ if (ipv6_dev_get_saddr(nf_ct_net(ct), out,
+ &ipv6_hdr(skb)->daddr, 0, &src) < 0)
+ return NF_DROP;
+
+ nat = nf_ct_nat_ext_add(ct);
+ if (nat)
+ nat->masq_index = out->ifindex;
+
+ newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS;
+ newrange.min_addr.in6 = src;
+ newrange.max_addr.in6 = src;
+ newrange.min_proto = range->min_proto;
+ newrange.max_proto = range->max_proto;
+
+ return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_SRC);
+}
+EXPORT_SYMBOL_GPL(nf_nat_masquerade_ipv6);
+
+static int device_cmp(struct nf_conn *ct, void *ifindex)
+{
+ const struct nf_conn_nat *nat = nfct_nat(ct);
+
+ if (!nat)
+ return 0;
+ if (nf_ct_l3num(ct) != NFPROTO_IPV6)
+ return 0;
+ return nat->masq_index == (int)(long)ifindex;
+}
+
+static int masq_device_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ const struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct net *net = dev_net(dev);
+
+ if (event == NETDEV_DOWN)
+ nf_ct_iterate_cleanup_net(net, device_cmp,
+ (void *)(long)dev->ifindex, 0, 0);
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block masq_dev_notifier = {
+ .notifier_call = masq_device_event,
+};
+
+struct masq_dev_work {
+ struct work_struct work;
+ struct net *net;
+ int ifindex;
+};
+
+static void iterate_cleanup_work(struct work_struct *work)
+{
+ struct masq_dev_work *w;
+ long index;
+
+ w = container_of(work, struct masq_dev_work, work);
+
+ index = w->ifindex;
+ nf_ct_iterate_cleanup_net(w->net, device_cmp, (void *)index, 0, 0);
+
+ put_net(w->net);
+ kfree(w);
+ atomic_dec(&v6_worker_count);
+ module_put(THIS_MODULE);
+}
+
+/* ipv6 inet notifier is an atomic notifier, i.e. we cannot
+ * schedule.
+ *
+ * Unfortunately, nf_ct_iterate_cleanup_net can run for a long
+ * time if there are lots of conntracks and the system
+ * handles high softirq load, so it frequently calls cond_resched
+ * while iterating the conntrack table.
+ *
+ * So we defer nf_ct_iterate_cleanup_net walk to the system workqueue.
+ *
+ * As we can have 'a lot' of inet_events (depending on amount
+ * of ipv6 addresses being deleted), we also need to add an upper
+ * limit to the number of queued work items.
+ */
+static int masq_inet6_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct inet6_ifaddr *ifa = ptr;
+ const struct net_device *dev;
+ struct masq_dev_work *w;
+ struct net *net;
+
+ if (event != NETDEV_DOWN ||
+ atomic_read(&v6_worker_count) >= MAX_WORK_COUNT)
+ return NOTIFY_DONE;
+
+ dev = ifa->idev->dev;
+ net = maybe_get_net(dev_net(dev));
+ if (!net)
+ return NOTIFY_DONE;
+
+ if (!try_module_get(THIS_MODULE))
+ goto err_module;
+
+ w = kmalloc(sizeof(*w), GFP_ATOMIC);
+ if (w) {
+ atomic_inc(&v6_worker_count);
+
+ INIT_WORK(&w->work, iterate_cleanup_work);
+ w->ifindex = dev->ifindex;
+ w->net = net;
+ schedule_work(&w->work);
+
+ return NOTIFY_DONE;
+ }
+
+ module_put(THIS_MODULE);
+ err_module:
+ put_net(net);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block masq_inet6_notifier = {
+ .notifier_call = masq_inet6_event,
+};
+
+static int masq_refcnt;
+static DEFINE_MUTEX(masq_mutex);
+
+int nf_nat_masquerade_ipv6_register_notifier(void)
+{
+ int ret = 0;
+
+ mutex_lock(&masq_mutex);
+ /* check if the notifier is already set */
+ if (++masq_refcnt > 1)
+ goto out_unlock;
+
+ ret = register_netdevice_notifier(&masq_dev_notifier);
+ if (ret)
+ goto err_dec;
+
+ ret = register_inet6addr_notifier(&masq_inet6_notifier);
+ if (ret)
+ goto err_unregister;
+
+ mutex_unlock(&masq_mutex);
+ return ret;
+
+err_unregister:
+ unregister_netdevice_notifier(&masq_dev_notifier);
+err_dec:
+ masq_refcnt--;
+out_unlock:
+ mutex_unlock(&masq_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_nat_masquerade_ipv6_register_notifier);
+
+void nf_nat_masquerade_ipv6_unregister_notifier(void)
+{
+ mutex_lock(&masq_mutex);
+ /* check if the notifier still has clients */
+ if (--masq_refcnt > 0)
+ goto out_unlock;
+
+ unregister_inet6addr_notifier(&masq_inet6_notifier);
+ unregister_netdevice_notifier(&masq_dev_notifier);
+out_unlock:
+ mutex_unlock(&masq_mutex);
+}
+EXPORT_SYMBOL_GPL(nf_nat_masquerade_ipv6_unregister_notifier);
diff --git a/net/ipv6/netfilter/nf_nat_proto_icmpv6.c b/net/ipv6/netfilter/nf_nat_proto_icmpv6.c
new file mode 100644
index 0000000..d9bf42b
--- /dev/null
+++ b/net/ipv6/netfilter/nf_nat_proto_icmpv6.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2011 Patrick Mchardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Based on Rusty Russell's IPv4 ICMP NAT code. Development of IPv6
+ * NAT funded by Astaro.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/icmpv6.h>
+
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/netfilter/nf_nat_l4proto.h>
+
+static bool
+icmpv6_in_range(const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype,
+ const union nf_conntrack_man_proto *min,
+ const union nf_conntrack_man_proto *max)
+{
+ return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) &&
+ ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id);
+}
+
+static void
+icmpv6_unique_tuple(const struct nf_nat_l3proto *l3proto,
+ struct nf_conntrack_tuple *tuple,
+ const struct nf_nat_range2 *range,
+ enum nf_nat_manip_type maniptype,
+ const struct nf_conn *ct)
+{
+ static u16 id;
+ unsigned int range_size;
+ unsigned int i;
+
+ range_size = ntohs(range->max_proto.icmp.id) -
+ ntohs(range->min_proto.icmp.id) + 1;
+
+ if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED))
+ range_size = 0xffff;
+
+ for (i = 0; ; ++id) {
+ tuple->src.u.icmp.id = htons(ntohs(range->min_proto.icmp.id) +
+ (id % range_size));
+ if (++i == range_size || !nf_nat_used_tuple(tuple, ct))
+ return;
+ }
+}
+
+static bool
+icmpv6_manip_pkt(struct sk_buff *skb,
+ const struct nf_nat_l3proto *l3proto,
+ unsigned int iphdroff, unsigned int hdroff,
+ const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype)
+{
+ struct icmp6hdr *hdr;
+
+ if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
+ return false;
+
+ hdr = (struct icmp6hdr *)(skb->data + hdroff);
+ l3proto->csum_update(skb, iphdroff, &hdr->icmp6_cksum,
+ tuple, maniptype);
+ if (hdr->icmp6_type == ICMPV6_ECHO_REQUEST ||
+ hdr->icmp6_type == ICMPV6_ECHO_REPLY) {
+ inet_proto_csum_replace2(&hdr->icmp6_cksum, skb,
+ hdr->icmp6_identifier,
+ tuple->src.u.icmp.id, false);
+ hdr->icmp6_identifier = tuple->src.u.icmp.id;
+ }
+ return true;
+}
+
+const struct nf_nat_l4proto nf_nat_l4proto_icmpv6 = {
+ .l4proto = IPPROTO_ICMPV6,
+ .manip_pkt = icmpv6_manip_pkt,
+ .in_range = icmpv6_in_range,
+ .unique_tuple = icmpv6_unique_tuple,
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+ .nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
+#endif
+};
diff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c
new file mode 100644
index 0000000..2485840
--- /dev/null
+++ b/net/ipv6/netfilter/nf_reject_ipv6.c
@@ -0,0 +1,248 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_checksum.h>
+#include <net/netfilter/ipv6/nf_reject.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter_bridge.h>
+
+const struct tcphdr *nf_reject_ip6_tcphdr_get(struct sk_buff *oldskb,
+ struct tcphdr *otcph,
+ unsigned int *otcplen, int hook)
+{
+ const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);
+ u8 proto;
+ __be16 frag_off;
+ int tcphoff;
+
+ proto = oip6h->nexthdr;
+ tcphoff = ipv6_skip_exthdr(oldskb, ((u8 *)(oip6h + 1) - oldskb->data),
+ &proto, &frag_off);
+
+ if ((tcphoff < 0) || (tcphoff > oldskb->len)) {
+ pr_debug("Cannot get TCP header.\n");
+ return NULL;
+ }
+
+ *otcplen = oldskb->len - tcphoff;
+
+ /* IP header checks: fragment, too short. */
+ if (proto != IPPROTO_TCP || *otcplen < sizeof(struct tcphdr)) {
+ pr_debug("proto(%d) != IPPROTO_TCP or too short (len = %d)\n",
+ proto, *otcplen);
+ return NULL;
+ }
+
+ otcph = skb_header_pointer(oldskb, tcphoff, sizeof(struct tcphdr),
+ otcph);
+ if (otcph == NULL)
+ return NULL;
+
+ /* No RST for RST. */
+ if (otcph->rst) {
+ pr_debug("RST is set\n");
+ return NULL;
+ }
+
+ /* Check checksum. */
+ if (nf_ip6_checksum(oldskb, hook, tcphoff, IPPROTO_TCP)) {
+ pr_debug("TCP checksum is invalid\n");
+ return NULL;
+ }
+
+ return otcph;
+}
+EXPORT_SYMBOL_GPL(nf_reject_ip6_tcphdr_get);
+
+struct ipv6hdr *nf_reject_ip6hdr_put(struct sk_buff *nskb,
+ const struct sk_buff *oldskb,
+ __u8 protocol, int hoplimit)
+{
+ struct ipv6hdr *ip6h;
+ const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);
+#define DEFAULT_TOS_VALUE 0x0U
+ const __u8 tclass = DEFAULT_TOS_VALUE;
+
+ skb_put(nskb, sizeof(struct ipv6hdr));
+ skb_reset_network_header(nskb);
+ ip6h = ipv6_hdr(nskb);
+ ip6_flow_hdr(ip6h, tclass, 0);
+ ip6h->hop_limit = hoplimit;
+ ip6h->nexthdr = protocol;
+ ip6h->saddr = oip6h->daddr;
+ ip6h->daddr = oip6h->saddr;
+
+ nskb->protocol = htons(ETH_P_IPV6);
+
+ return ip6h;
+}
+EXPORT_SYMBOL_GPL(nf_reject_ip6hdr_put);
+
+void nf_reject_ip6_tcphdr_put(struct sk_buff *nskb,
+ const struct sk_buff *oldskb,
+ const struct tcphdr *oth, unsigned int otcplen)
+{
+ struct tcphdr *tcph;
+ int needs_ack;
+
+ skb_reset_transport_header(nskb);
+ tcph = skb_put(nskb, sizeof(struct tcphdr));
+ /* Truncate to length (no data) */
+ tcph->doff = sizeof(struct tcphdr)/4;
+ tcph->source = oth->dest;
+ tcph->dest = oth->source;
+
+ if (oth->ack) {
+ needs_ack = 0;
+ tcph->seq = oth->ack_seq;
+ tcph->ack_seq = 0;
+ } else {
+ needs_ack = 1;
+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin +
+ otcplen - (oth->doff<<2));
+ tcph->seq = 0;
+ }
+
+ /* Reset flags */
+ ((u_int8_t *)tcph)[13] = 0;
+ tcph->rst = 1;
+ tcph->ack = needs_ack;
+ tcph->window = 0;
+ tcph->urg_ptr = 0;
+ tcph->check = 0;
+
+ /* Adjust TCP checksum */
+ tcph->check = csum_ipv6_magic(&ipv6_hdr(nskb)->saddr,
+ &ipv6_hdr(nskb)->daddr,
+ sizeof(struct tcphdr), IPPROTO_TCP,
+ csum_partial(tcph,
+ sizeof(struct tcphdr), 0));
+}
+EXPORT_SYMBOL_GPL(nf_reject_ip6_tcphdr_put);
+
+void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
+{
+ struct sk_buff *nskb;
+ struct tcphdr _otcph;
+ const struct tcphdr *otcph;
+ unsigned int otcplen, hh_len;
+ const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);
+ struct ipv6hdr *ip6h;
+ struct dst_entry *dst = NULL;
+ struct flowi6 fl6;
+
+ if ((!(ipv6_addr_type(&oip6h->saddr) & IPV6_ADDR_UNICAST)) ||
+ (!(ipv6_addr_type(&oip6h->daddr) & IPV6_ADDR_UNICAST))) {
+ pr_debug("addr is not unicast.\n");
+ return;
+ }
+
+ otcph = nf_reject_ip6_tcphdr_get(oldskb, &_otcph, &otcplen, hook);
+ if (!otcph)
+ return;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_TCP;
+ fl6.saddr = oip6h->daddr;
+ fl6.daddr = oip6h->saddr;
+ fl6.fl6_sport = otcph->dest;
+ fl6.fl6_dport = otcph->source;
+ fl6.flowi6_oif = l3mdev_master_ifindex(skb_dst(oldskb)->dev);
+ fl6.flowi6_mark = IP6_REPLY_MARK(net, oldskb->mark);
+ security_skb_classify_flow(oldskb, flowi6_to_flowi(&fl6));
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (dst->error) {
+ dst_release(dst);
+ return;
+ }
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
+ if (IS_ERR(dst))
+ return;
+
+ hh_len = (dst->dev->hard_header_len + 15)&~15;
+ nskb = alloc_skb(hh_len + 15 + dst->header_len + sizeof(struct ipv6hdr)
+ + sizeof(struct tcphdr) + dst->trailer_len,
+ GFP_ATOMIC);
+
+ if (!nskb) {
+ net_dbg_ratelimited("cannot alloc skb\n");
+ dst_release(dst);
+ return;
+ }
+
+ skb_dst_set(nskb, dst);
+
+ nskb->mark = fl6.flowi6_mark;
+
+ skb_reserve(nskb, hh_len + dst->header_len);
+ ip6h = nf_reject_ip6hdr_put(nskb, oldskb, IPPROTO_TCP,
+ ip6_dst_hoplimit(dst));
+ nf_reject_ip6_tcphdr_put(nskb, oldskb, otcph, otcplen);
+
+ nf_ct_attach(nskb, oldskb);
+
+#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
+ /* If we use ip6_local_out for bridged traffic, the MAC source on
+ * the RST will be ours, instead of the destination's. This confuses
+ * some routers/firewalls, and they drop the packet. So we need to
+ * build the eth header using the original destination's MAC as the
+ * source, and send the RST packet directly.
+ */
+ if (oldskb->nf_bridge) {
+ struct ethhdr *oeth = eth_hdr(oldskb);
+
+ nskb->dev = nf_bridge_get_physindev(oldskb);
+ nskb->protocol = htons(ETH_P_IPV6);
+ ip6h->payload_len = htons(sizeof(struct tcphdr));
+ if (dev_hard_header(nskb, nskb->dev, ntohs(nskb->protocol),
+ oeth->h_source, oeth->h_dest, nskb->len) < 0)
+ return;
+ dev_queue_xmit(nskb);
+ } else
+#endif
+ ip6_local_out(net, nskb->sk, nskb);
+}
+EXPORT_SYMBOL_GPL(nf_send_reset6);
+
+static bool reject6_csum_ok(struct sk_buff *skb, int hook)
+{
+ const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ int thoff;
+ __be16 fo;
+ u8 proto;
+
+ if (skb_csum_unnecessary(skb))
+ return true;
+
+ proto = ip6h->nexthdr;
+ thoff = ipv6_skip_exthdr(skb, ((u8 *)(ip6h + 1) - skb->data), &proto, &fo);
+
+ if (thoff < 0 || thoff >= skb->len || (fo & htons(~0x7)) != 0)
+ return false;
+
+ return nf_ip6_checksum(skb, hook, thoff, proto) == 0;
+}
+
+void nf_send_unreach6(struct net *net, struct sk_buff *skb_in,
+ unsigned char code, unsigned int hooknum)
+{
+ if (!reject6_csum_ok(skb_in, hooknum))
+ return;
+
+ if (hooknum == NF_INET_LOCAL_OUT && skb_in->dev == NULL)
+ skb_in->dev = net->loopback_dev;
+
+ icmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0);
+}
+EXPORT_SYMBOL_GPL(nf_send_unreach6);
+
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/netfilter/nf_socket_ipv6.c b/net/ipv6/netfilter/nf_socket_ipv6.c
new file mode 100644
index 0000000..f14de4b
--- /dev/null
+++ b/net/ipv6/netfilter/nf_socket_ipv6.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 2007-2008 BalaBit IT Ltd.
+ * Author: Krisztian Kovacs
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <net/icmp.h>
+#include <net/sock.h>
+#include <net/inet_sock.h>
+#include <net/inet6_hashtables.h>
+#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
+#include <net/netfilter/nf_socket.h>
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+#include <net/netfilter/nf_conntrack.h>
+#endif
+
+static int
+extract_icmp6_fields(const struct sk_buff *skb,
+ unsigned int outside_hdrlen,
+ int *protocol,
+ const struct in6_addr **raddr,
+ const struct in6_addr **laddr,
+ __be16 *rport,
+ __be16 *lport,
+ struct ipv6hdr *ipv6_var)
+{
+ const struct ipv6hdr *inside_iph;
+ struct icmp6hdr *icmph, _icmph;
+ __be16 *ports, _ports[2];
+ u8 inside_nexthdr;
+ __be16 inside_fragoff;
+ int inside_hdrlen;
+
+ icmph = skb_header_pointer(skb, outside_hdrlen,
+ sizeof(_icmph), &_icmph);
+ if (icmph == NULL)
+ return 1;
+
+ if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK)
+ return 1;
+
+ inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph),
+ sizeof(*ipv6_var), ipv6_var);
+ if (inside_iph == NULL)
+ return 1;
+ inside_nexthdr = inside_iph->nexthdr;
+
+ inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) +
+ sizeof(*ipv6_var),
+ &inside_nexthdr, &inside_fragoff);
+ if (inside_hdrlen < 0)
+ return 1; /* hjm: Packet has no/incomplete transport layer headers. */
+
+ if (inside_nexthdr != IPPROTO_TCP &&
+ inside_nexthdr != IPPROTO_UDP)
+ return 1;
+
+ ports = skb_header_pointer(skb, inside_hdrlen,
+ sizeof(_ports), &_ports);
+ if (ports == NULL)
+ return 1;
+
+ /* the inside IP packet is the one quoted from our side, thus
+ * its saddr is the local address */
+ *protocol = inside_nexthdr;
+ *laddr = &inside_iph->saddr;
+ *lport = ports[0];
+ *raddr = &inside_iph->daddr;
+ *rport = ports[1];
+
+ return 0;
+}
+
+static struct sock *
+nf_socket_get_sock_v6(struct net *net, struct sk_buff *skb, int doff,
+ const u8 protocol,
+ const struct in6_addr *saddr, const struct in6_addr *daddr,
+ const __be16 sport, const __be16 dport,
+ const struct net_device *in)
+{
+ switch (protocol) {
+ case IPPROTO_TCP:
+ return inet6_lookup(net, &tcp_hashinfo, skb, doff,
+ saddr, sport, daddr, dport,
+ in->ifindex);
+ case IPPROTO_UDP:
+ return udp6_lib_lookup(net, saddr, sport, daddr, dport,
+ in->ifindex);
+ }
+
+ return NULL;
+}
+
+struct sock *nf_sk_lookup_slow_v6(struct net *net, const struct sk_buff *skb,
+ const struct net_device *indev)
+{
+ __be16 uninitialized_var(dport), uninitialized_var(sport);
+ const struct in6_addr *daddr = NULL, *saddr = NULL;
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct sk_buff *data_skb = NULL;
+ int doff = 0;
+ int thoff = 0, tproto;
+
+ tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL);
+ if (tproto < 0) {
+ pr_debug("unable to find transport header in IPv6 packet, dropping\n");
+ return NULL;
+ }
+
+ if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) {
+ struct tcphdr _hdr;
+ struct udphdr *hp;
+
+ hp = skb_header_pointer(skb, thoff, tproto == IPPROTO_UDP ?
+ sizeof(*hp) : sizeof(_hdr), &_hdr);
+ if (hp == NULL)
+ return NULL;
+
+ saddr = &iph->saddr;
+ sport = hp->source;
+ daddr = &iph->daddr;
+ dport = hp->dest;
+ data_skb = (struct sk_buff *)skb;
+ doff = tproto == IPPROTO_TCP ?
+ thoff + __tcp_hdrlen((struct tcphdr *)hp) :
+ thoff + sizeof(*hp);
+
+ } else if (tproto == IPPROTO_ICMPV6) {
+ struct ipv6hdr ipv6_var;
+
+ if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr,
+ &sport, &dport, &ipv6_var))
+ return NULL;
+ } else {
+ return NULL;
+ }
+
+ return nf_socket_get_sock_v6(net, data_skb, doff, tproto, saddr, daddr,
+ sport, dport, indev);
+}
+EXPORT_SYMBOL_GPL(nf_sk_lookup_slow_v6);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Krisztian Kovacs, Balazs Scheidler");
+MODULE_DESCRIPTION("Netfilter IPv6 socket lookup infrastructure");
diff --git a/net/ipv6/netfilter/nf_tproxy_ipv6.c b/net/ipv6/netfilter/nf_tproxy_ipv6.c
new file mode 100644
index 0000000..5dfd33a
--- /dev/null
+++ b/net/ipv6/netfilter/nf_tproxy_ipv6.c
@@ -0,0 +1,152 @@
+#include <net/netfilter/nf_tproxy.h>
+#include <linux/module.h>
+#include <net/inet6_hashtables.h>
+#include <net/addrconf.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+
+const struct in6_addr *
+nf_tproxy_laddr6(struct sk_buff *skb, const struct in6_addr *user_laddr,
+ const struct in6_addr *daddr)
+{
+ struct inet6_dev *indev;
+ struct inet6_ifaddr *ifa;
+ struct in6_addr *laddr;
+
+ if (!ipv6_addr_any(user_laddr))
+ return user_laddr;
+ laddr = NULL;
+
+ indev = __in6_dev_get(skb->dev);
+ if (indev) {
+ read_lock_bh(&indev->lock);
+ list_for_each_entry(ifa, &indev->addr_list, if_list) {
+ if (ifa->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED))
+ continue;
+
+ laddr = &ifa->addr;
+ break;
+ }
+ read_unlock_bh(&indev->lock);
+ }
+
+ return laddr ? laddr : daddr;
+}
+EXPORT_SYMBOL_GPL(nf_tproxy_laddr6);
+
+struct sock *
+nf_tproxy_handle_time_wait6(struct sk_buff *skb, int tproto, int thoff,
+ struct net *net,
+ const struct in6_addr *laddr,
+ const __be16 lport,
+ struct sock *sk)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct tcphdr _hdr, *hp;
+
+ hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr);
+ if (hp == NULL) {
+ inet_twsk_put(inet_twsk(sk));
+ return NULL;
+ }
+
+ if (hp->syn && !hp->rst && !hp->ack && !hp->fin) {
+ /* SYN to a TIME_WAIT socket, we'd rather redirect it
+ * to a listener socket if there's one */
+ struct sock *sk2;
+
+ sk2 = nf_tproxy_get_sock_v6(net, skb, thoff, tproto,
+ &iph->saddr,
+ nf_tproxy_laddr6(skb, laddr, &iph->daddr),
+ hp->source,
+ lport ? lport : hp->dest,
+ skb->dev, NF_TPROXY_LOOKUP_LISTENER);
+ if (sk2) {
+ inet_twsk_deschedule_put(inet_twsk(sk));
+ sk = sk2;
+ }
+ }
+
+ return sk;
+}
+EXPORT_SYMBOL_GPL(nf_tproxy_handle_time_wait6);
+
+struct sock *
+nf_tproxy_get_sock_v6(struct net *net, struct sk_buff *skb, int thoff,
+ const u8 protocol,
+ const struct in6_addr *saddr, const struct in6_addr *daddr,
+ const __be16 sport, const __be16 dport,
+ const struct net_device *in,
+ const enum nf_tproxy_lookup_t lookup_type)
+{
+ struct sock *sk;
+
+ switch (protocol) {
+ case IPPROTO_TCP: {
+ struct tcphdr _hdr, *hp;
+
+ hp = skb_header_pointer(skb, thoff,
+ sizeof(struct tcphdr), &_hdr);
+ if (hp == NULL)
+ return NULL;
+
+ switch (lookup_type) {
+ case NF_TPROXY_LOOKUP_LISTENER:
+ sk = inet6_lookup_listener(net, &tcp_hashinfo, skb,
+ thoff + __tcp_hdrlen(hp),
+ saddr, sport,
+ daddr, ntohs(dport),
+ in->ifindex, 0);
+
+ if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
+ sk = NULL;
+ /* NOTE: we return listeners even if bound to
+ * 0.0.0.0, those are filtered out in
+ * xt_socket, since xt_TPROXY needs 0 bound
+ * listeners too
+ */
+ break;
+ case NF_TPROXY_LOOKUP_ESTABLISHED:
+ sk = __inet6_lookup_established(net, &tcp_hashinfo,
+ saddr, sport, daddr, ntohs(dport),
+ in->ifindex, 0);
+ break;
+ default:
+ BUG();
+ }
+ break;
+ }
+ case IPPROTO_UDP:
+ sk = udp6_lib_lookup(net, saddr, sport, daddr, dport,
+ in->ifindex);
+ if (sk) {
+ int connected = (sk->sk_state == TCP_ESTABLISHED);
+ int wildcard = ipv6_addr_any(&sk->sk_v6_rcv_saddr);
+
+ /* NOTE: we return listeners even if bound to
+ * 0.0.0.0, those are filtered out in
+ * xt_socket, since xt_TPROXY needs 0 bound
+ * listeners too
+ */
+ if ((lookup_type == NF_TPROXY_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
+ (lookup_type == NF_TPROXY_LOOKUP_LISTENER && connected)) {
+ sock_put(sk);
+ sk = NULL;
+ }
+ }
+ break;
+ default:
+ WARN_ON(1);
+ sk = NULL;
+ }
+
+ pr_debug("tproxy socket lookup: proto %u %pI6:%u -> %pI6:%u, lookup type: %d, sock %p\n",
+ protocol, saddr, ntohs(sport), daddr, ntohs(dport), lookup_type, sk);
+
+ return sk;
+}
+EXPORT_SYMBOL_GPL(nf_tproxy_get_sock_v6);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Balazs Scheidler, Krisztian Kovacs");
+MODULE_DESCRIPTION("Netfilter IPv4 transparent proxy support");
diff --git a/net/ipv6/netfilter/nft_chain_nat_ipv6.c b/net/ipv6/netfilter/nft_chain_nat_ipv6.c
new file mode 100644
index 0000000..8a081ad
--- /dev/null
+++ b/net/ipv6/netfilter/nft_chain_nat_ipv6.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ * Copyright (c) 2012 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_ipv6.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/ipv6.h>
+
+static unsigned int nft_nat_do_chain(void *priv,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ struct nft_pktinfo pkt;
+
+ nft_set_pktinfo(&pkt, skb, state);
+ nft_set_pktinfo_ipv6(&pkt, skb);
+
+ return nft_do_chain(&pkt, priv);
+}
+
+static int nft_nat_ipv6_reg(struct net *net, const struct nf_hook_ops *ops)
+{
+ return nf_nat_l3proto_ipv6_register_fn(net, ops);
+}
+
+static void nft_nat_ipv6_unreg(struct net *net, const struct nf_hook_ops *ops)
+{
+ nf_nat_l3proto_ipv6_unregister_fn(net, ops);
+}
+
+static const struct nft_chain_type nft_chain_nat_ipv6 = {
+ .name = "nat",
+ .type = NFT_CHAIN_T_NAT,
+ .family = NFPROTO_IPV6,
+ .owner = THIS_MODULE,
+ .hook_mask = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_POST_ROUTING) |
+ (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_LOCAL_IN),
+ .hooks = {
+ [NF_INET_PRE_ROUTING] = nft_nat_do_chain,
+ [NF_INET_POST_ROUTING] = nft_nat_do_chain,
+ [NF_INET_LOCAL_OUT] = nft_nat_do_chain,
+ [NF_INET_LOCAL_IN] = nft_nat_do_chain,
+ },
+ .ops_register = nft_nat_ipv6_reg,
+ .ops_unregister = nft_nat_ipv6_unreg,
+};
+
+static int __init nft_chain_nat_ipv6_init(void)
+{
+ nft_register_chain_type(&nft_chain_nat_ipv6);
+
+ return 0;
+}
+
+static void __exit nft_chain_nat_ipv6_exit(void)
+{
+ nft_unregister_chain_type(&nft_chain_nat_ipv6);
+}
+
+module_init(nft_chain_nat_ipv6_init);
+module_exit(nft_chain_nat_ipv6_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
+MODULE_ALIAS_NFT_CHAIN(AF_INET6, "nat");
diff --git a/net/ipv6/netfilter/nft_chain_route_ipv6.c b/net/ipv6/netfilter/nft_chain_route_ipv6.c
new file mode 100644
index 0000000..da3f1f8
--- /dev/null
+++ b/net/ipv6/netfilter/nft_chain_route_ipv6.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
+ * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_ipv6.h>
+#include <net/route.h>
+
+static unsigned int nf_route_table_hook(void *priv,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ unsigned int ret;
+ struct nft_pktinfo pkt;
+ struct in6_addr saddr, daddr;
+ u_int8_t hop_limit;
+ u32 mark, flowlabel;
+ int err;
+
+ nft_set_pktinfo(&pkt, skb, state);
+ nft_set_pktinfo_ipv6(&pkt, skb);
+
+ /* save source/dest address, mark, hoplimit, flowlabel, priority */
+ memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
+ memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
+ mark = skb->mark;
+ hop_limit = ipv6_hdr(skb)->hop_limit;
+
+ /* flowlabel and prio (includes version, which shouldn't change either */
+ flowlabel = *((u32 *)ipv6_hdr(skb));
+
+ ret = nft_do_chain(&pkt, priv);
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) ||
+ memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) ||
+ skb->mark != mark ||
+ ipv6_hdr(skb)->hop_limit != hop_limit ||
+ flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
+ err = ip6_route_me_harder(state->net, skb);
+ if (err < 0)
+ ret = NF_DROP_ERR(err);
+ }
+
+ return ret;
+}
+
+static const struct nft_chain_type nft_chain_route_ipv6 = {
+ .name = "route",
+ .type = NFT_CHAIN_T_ROUTE,
+ .family = NFPROTO_IPV6,
+ .owner = THIS_MODULE,
+ .hook_mask = (1 << NF_INET_LOCAL_OUT),
+ .hooks = {
+ [NF_INET_LOCAL_OUT] = nf_route_table_hook,
+ },
+};
+
+static int __init nft_chain_route_init(void)
+{
+ nft_register_chain_type(&nft_chain_route_ipv6);
+
+ return 0;
+}
+
+static void __exit nft_chain_route_exit(void)
+{
+ nft_unregister_chain_type(&nft_chain_route_ipv6);
+}
+
+module_init(nft_chain_route_init);
+module_exit(nft_chain_route_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route");
diff --git a/net/ipv6/netfilter/nft_dup_ipv6.c b/net/ipv6/netfilter/nft_dup_ipv6.c
new file mode 100644
index 0000000..d8b5b60
--- /dev/null
+++ b/net/ipv6/netfilter/nft_dup_ipv6.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/ipv6/nf_dup_ipv6.h>
+
+struct nft_dup_ipv6 {
+ enum nft_registers sreg_addr:8;
+ enum nft_registers sreg_dev:8;
+};
+
+static void nft_dup_ipv6_eval(const struct nft_expr *expr,
+ struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
+ struct in6_addr *gw = (struct in6_addr *)®s->data[priv->sreg_addr];
+ int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1;
+
+ nf_dup_ipv6(nft_net(pkt), pkt->skb, nft_hook(pkt), gw, oif);
+}
+
+static int nft_dup_ipv6_init(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nlattr * const tb[])
+{
+ struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
+ int err;
+
+ if (tb[NFTA_DUP_SREG_ADDR] == NULL)
+ return -EINVAL;
+
+ priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]);
+ err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in6_addr));
+ if (err < 0)
+ return err;
+
+ if (tb[NFTA_DUP_SREG_DEV] != NULL) {
+ priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
+ return nft_validate_register_load(priv->sreg_dev, sizeof(int));
+ }
+ return 0;
+}
+
+static int nft_dup_ipv6_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+ struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
+
+ if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr))
+ goto nla_put_failure;
+ if (priv->sreg_dev &&
+ nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
+static struct nft_expr_type nft_dup_ipv6_type;
+static const struct nft_expr_ops nft_dup_ipv6_ops = {
+ .type = &nft_dup_ipv6_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv6)),
+ .eval = nft_dup_ipv6_eval,
+ .init = nft_dup_ipv6_init,
+ .dump = nft_dup_ipv6_dump,
+};
+
+static const struct nla_policy nft_dup_ipv6_policy[NFTA_DUP_MAX + 1] = {
+ [NFTA_DUP_SREG_ADDR] = { .type = NLA_U32 },
+ [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 },
+};
+
+static struct nft_expr_type nft_dup_ipv6_type __read_mostly = {
+ .family = NFPROTO_IPV6,
+ .name = "dup",
+ .ops = &nft_dup_ipv6_ops,
+ .policy = nft_dup_ipv6_policy,
+ .maxattr = NFTA_DUP_MAX,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_dup_ipv6_module_init(void)
+{
+ return nft_register_expr(&nft_dup_ipv6_type);
+}
+
+static void __exit nft_dup_ipv6_module_exit(void)
+{
+ nft_unregister_expr(&nft_dup_ipv6_type);
+}
+
+module_init(nft_dup_ipv6_module_init);
+module_exit(nft_dup_ipv6_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "dup");
diff --git a/net/ipv6/netfilter/nft_fib_ipv6.c b/net/ipv6/netfilter/nft_fib_ipv6.c
new file mode 100644
index 0000000..36be3cf
--- /dev/null
+++ b/net/ipv6/netfilter/nft_fib_ipv6.c
@@ -0,0 +1,278 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <linux/netfilter_ipv6.h>
+#include <net/netfilter/nf_tables_core.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nft_fib.h>
+
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+
+static int get_ifindex(const struct net_device *dev)
+{
+ return dev ? dev->ifindex : 0;
+}
+
+static int nft_fib6_flowi_init(struct flowi6 *fl6, const struct nft_fib *priv,
+ const struct nft_pktinfo *pkt,
+ const struct net_device *dev,
+ struct ipv6hdr *iph)
+{
+ int lookup_flags = 0;
+
+ if (priv->flags & NFTA_FIB_F_DADDR) {
+ fl6->daddr = iph->daddr;
+ fl6->saddr = iph->saddr;
+ } else {
+ fl6->daddr = iph->saddr;
+ fl6->saddr = iph->daddr;
+ }
+
+ if (ipv6_addr_type(&fl6->daddr) & IPV6_ADDR_LINKLOCAL) {
+ lookup_flags |= RT6_LOOKUP_F_IFACE;
+ fl6->flowi6_oif = get_ifindex(dev ? dev : pkt->skb->dev);
+ }
+
+ if (ipv6_addr_type(&fl6->saddr) & IPV6_ADDR_UNICAST)
+ lookup_flags |= RT6_LOOKUP_F_HAS_SADDR;
+
+ if (priv->flags & NFTA_FIB_F_MARK)
+ fl6->flowi6_mark = pkt->skb->mark;
+
+ fl6->flowlabel = (*(__be32 *)iph) & IPV6_FLOWINFO_MASK;
+
+ return lookup_flags;
+}
+
+static u32 __nft_fib6_eval_type(const struct nft_fib *priv,
+ const struct nft_pktinfo *pkt,
+ struct ipv6hdr *iph)
+{
+ const struct net_device *dev = NULL;
+ const struct nf_ipv6_ops *v6ops;
+ int route_err, addrtype;
+ struct rt6_info *rt;
+ struct flowi6 fl6 = {
+ .flowi6_iif = LOOPBACK_IFINDEX,
+ .flowi6_proto = pkt->tprot,
+ };
+ u32 ret = 0;
+
+ v6ops = nf_get_ipv6_ops();
+ if (!v6ops)
+ return RTN_UNREACHABLE;
+
+ if (priv->flags & NFTA_FIB_F_IIF)
+ dev = nft_in(pkt);
+ else if (priv->flags & NFTA_FIB_F_OIF)
+ dev = nft_out(pkt);
+
+ nft_fib6_flowi_init(&fl6, priv, pkt, dev, iph);
+
+ if (dev && v6ops->chk_addr(nft_net(pkt), &fl6.daddr, dev, true))
+ ret = RTN_LOCAL;
+
+ route_err = v6ops->route(nft_net(pkt), (struct dst_entry **)&rt,
+ flowi6_to_flowi(&fl6), false);
+ if (route_err)
+ goto err;
+
+ if (rt->rt6i_flags & RTF_REJECT) {
+ route_err = rt->dst.error;
+ dst_release(&rt->dst);
+ goto err;
+ }
+
+ if (ipv6_anycast_destination((struct dst_entry *)rt, &fl6.daddr))
+ ret = RTN_ANYCAST;
+ else if (!dev && rt->rt6i_flags & RTF_LOCAL)
+ ret = RTN_LOCAL;
+
+ dst_release(&rt->dst);
+
+ if (ret)
+ return ret;
+
+ addrtype = ipv6_addr_type(&fl6.daddr);
+
+ if (addrtype & IPV6_ADDR_MULTICAST)
+ return RTN_MULTICAST;
+ if (addrtype & IPV6_ADDR_UNICAST)
+ return RTN_UNICAST;
+
+ return RTN_UNSPEC;
+ err:
+ switch (route_err) {
+ case -EINVAL:
+ return RTN_BLACKHOLE;
+ case -EACCES:
+ return RTN_PROHIBIT;
+ case -EAGAIN:
+ return RTN_THROW;
+ default:
+ break;
+ }
+
+ return RTN_UNREACHABLE;
+}
+
+void nft_fib6_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ const struct nft_fib *priv = nft_expr_priv(expr);
+ int noff = skb_network_offset(pkt->skb);
+ u32 *dest = ®s->data[priv->dreg];
+ struct ipv6hdr *iph, _iph;
+
+ iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
+ if (!iph) {
+ regs->verdict.code = NFT_BREAK;
+ return;
+ }
+
+ *dest = __nft_fib6_eval_type(priv, pkt, iph);
+}
+EXPORT_SYMBOL_GPL(nft_fib6_eval_type);
+
+void nft_fib6_eval(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ const struct nft_fib *priv = nft_expr_priv(expr);
+ int noff = skb_network_offset(pkt->skb);
+ const struct net_device *oif = NULL;
+ u32 *dest = ®s->data[priv->dreg];
+ struct ipv6hdr *iph, _iph;
+ struct flowi6 fl6 = {
+ .flowi6_iif = LOOPBACK_IFINDEX,
+ .flowi6_proto = pkt->tprot,
+ };
+ struct rt6_info *rt;
+ int lookup_flags;
+
+ if (priv->flags & NFTA_FIB_F_IIF)
+ oif = nft_in(pkt);
+ else if (priv->flags & NFTA_FIB_F_OIF)
+ oif = nft_out(pkt);
+
+ iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
+ if (!iph) {
+ regs->verdict.code = NFT_BREAK;
+ return;
+ }
+
+ lookup_flags = nft_fib6_flowi_init(&fl6, priv, pkt, oif, iph);
+
+ if (nft_hook(pkt) == NF_INET_PRE_ROUTING &&
+ nft_fib_is_loopback(pkt->skb, nft_in(pkt))) {
+ nft_fib_store_result(dest, priv, pkt,
+ nft_in(pkt)->ifindex);
+ return;
+ }
+
+ *dest = 0;
+ rt = (void *)ip6_route_lookup(nft_net(pkt), &fl6, pkt->skb,
+ lookup_flags);
+ if (rt->dst.error)
+ goto put_rt_err;
+
+ /* Should not see RTF_LOCAL here */
+ if (rt->rt6i_flags & (RTF_REJECT | RTF_ANYCAST | RTF_LOCAL))
+ goto put_rt_err;
+
+ if (oif && oif != rt->rt6i_idev->dev)
+ goto put_rt_err;
+
+ switch (priv->result) {
+ case NFT_FIB_RESULT_OIF:
+ *dest = rt->rt6i_idev->dev->ifindex;
+ break;
+ case NFT_FIB_RESULT_OIFNAME:
+ strncpy((char *)dest, rt->rt6i_idev->dev->name, IFNAMSIZ);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ put_rt_err:
+ ip6_rt_put(rt);
+}
+EXPORT_SYMBOL_GPL(nft_fib6_eval);
+
+static struct nft_expr_type nft_fib6_type;
+
+static const struct nft_expr_ops nft_fib6_type_ops = {
+ .type = &nft_fib6_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
+ .eval = nft_fib6_eval_type,
+ .init = nft_fib_init,
+ .dump = nft_fib_dump,
+ .validate = nft_fib_validate,
+};
+
+static const struct nft_expr_ops nft_fib6_ops = {
+ .type = &nft_fib6_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
+ .eval = nft_fib6_eval,
+ .init = nft_fib_init,
+ .dump = nft_fib_dump,
+ .validate = nft_fib_validate,
+};
+
+static const struct nft_expr_ops *
+nft_fib6_select_ops(const struct nft_ctx *ctx,
+ const struct nlattr * const tb[])
+{
+ enum nft_fib_result result;
+
+ if (!tb[NFTA_FIB_RESULT])
+ return ERR_PTR(-EINVAL);
+
+ result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
+
+ switch (result) {
+ case NFT_FIB_RESULT_OIF:
+ return &nft_fib6_ops;
+ case NFT_FIB_RESULT_OIFNAME:
+ return &nft_fib6_ops;
+ case NFT_FIB_RESULT_ADDRTYPE:
+ return &nft_fib6_type_ops;
+ default:
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+}
+
+static struct nft_expr_type nft_fib6_type __read_mostly = {
+ .name = "fib",
+ .select_ops = nft_fib6_select_ops,
+ .policy = nft_fib_policy,
+ .maxattr = NFTA_FIB_MAX,
+ .family = NFPROTO_IPV6,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_fib6_module_init(void)
+{
+ return nft_register_expr(&nft_fib6_type);
+}
+
+static void __exit nft_fib6_module_exit(void)
+{
+ nft_unregister_expr(&nft_fib6_type);
+}
+module_init(nft_fib6_module_init);
+module_exit(nft_fib6_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
+MODULE_ALIAS_NFT_AF_EXPR(10, "fib");
diff --git a/net/ipv6/netfilter/nft_masq_ipv6.c b/net/ipv6/netfilter/nft_masq_ipv6.c
new file mode 100644
index 0000000..e06c82e
--- /dev/null
+++ b/net/ipv6/netfilter/nft_masq_ipv6.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nft_masq.h>
+#include <net/netfilter/ipv6/nf_nat_masquerade.h>
+
+static void nft_masq_ipv6_eval(const struct nft_expr *expr,
+ struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ struct nft_masq *priv = nft_expr_priv(expr);
+ struct nf_nat_range2 range;
+
+ memset(&range, 0, sizeof(range));
+ range.flags = priv->flags;
+ if (priv->sreg_proto_min) {
+ range.min_proto.all = (__force __be16)nft_reg_load16(
+ ®s->data[priv->sreg_proto_min]);
+ range.max_proto.all = (__force __be16)nft_reg_load16(
+ ®s->data[priv->sreg_proto_max]);
+ }
+ regs->verdict.code = nf_nat_masquerade_ipv6(pkt->skb, &range,
+ nft_out(pkt));
+}
+
+static void
+nft_masq_ipv6_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
+{
+ nf_ct_netns_put(ctx->net, NFPROTO_IPV6);
+}
+
+static struct nft_expr_type nft_masq_ipv6_type;
+static const struct nft_expr_ops nft_masq_ipv6_ops = {
+ .type = &nft_masq_ipv6_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_masq)),
+ .eval = nft_masq_ipv6_eval,
+ .init = nft_masq_init,
+ .destroy = nft_masq_ipv6_destroy,
+ .dump = nft_masq_dump,
+ .validate = nft_masq_validate,
+};
+
+static struct nft_expr_type nft_masq_ipv6_type __read_mostly = {
+ .family = NFPROTO_IPV6,
+ .name = "masq",
+ .ops = &nft_masq_ipv6_ops,
+ .policy = nft_masq_policy,
+ .maxattr = NFTA_MASQ_MAX,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_masq_ipv6_module_init(void)
+{
+ int ret;
+
+ ret = nft_register_expr(&nft_masq_ipv6_type);
+ if (ret < 0)
+ return ret;
+
+ ret = nf_nat_masquerade_ipv6_register_notifier();
+ if (ret)
+ nft_unregister_expr(&nft_masq_ipv6_type);
+
+ return ret;
+}
+
+static void __exit nft_masq_ipv6_module_exit(void)
+{
+ nft_unregister_expr(&nft_masq_ipv6_type);
+ nf_nat_masquerade_ipv6_unregister_notifier();
+}
+
+module_init(nft_masq_ipv6_module_init);
+module_exit(nft_masq_ipv6_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "masq");
diff --git a/net/ipv6/netfilter/nft_redir_ipv6.c b/net/ipv6/netfilter/nft_redir_ipv6.c
new file mode 100644
index 0000000..7426986
--- /dev/null
+++ b/net/ipv6/netfilter/nft_redir_ipv6.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nft_redir.h>
+#include <net/netfilter/nf_nat_redirect.h>
+
+static void nft_redir_ipv6_eval(const struct nft_expr *expr,
+ struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ struct nft_redir *priv = nft_expr_priv(expr);
+ struct nf_nat_range2 range;
+
+ memset(&range, 0, sizeof(range));
+ if (priv->sreg_proto_min) {
+ range.min_proto.all = (__force __be16)nft_reg_load16(
+ ®s->data[priv->sreg_proto_min]);
+ range.max_proto.all = (__force __be16)nft_reg_load16(
+ ®s->data[priv->sreg_proto_max]);
+ range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
+ }
+
+ range.flags |= priv->flags;
+
+ regs->verdict.code =
+ nf_nat_redirect_ipv6(pkt->skb, &range, nft_hook(pkt));
+}
+
+static void
+nft_redir_ipv6_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
+{
+ nf_ct_netns_put(ctx->net, NFPROTO_IPV6);
+}
+
+static struct nft_expr_type nft_redir_ipv6_type;
+static const struct nft_expr_ops nft_redir_ipv6_ops = {
+ .type = &nft_redir_ipv6_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
+ .eval = nft_redir_ipv6_eval,
+ .init = nft_redir_init,
+ .destroy = nft_redir_ipv6_destroy,
+ .dump = nft_redir_dump,
+ .validate = nft_redir_validate,
+};
+
+static struct nft_expr_type nft_redir_ipv6_type __read_mostly = {
+ .family = NFPROTO_IPV6,
+ .name = "redir",
+ .ops = &nft_redir_ipv6_ops,
+ .policy = nft_redir_policy,
+ .maxattr = NFTA_REDIR_MAX,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_redir_ipv6_module_init(void)
+{
+ return nft_register_expr(&nft_redir_ipv6_type);
+}
+
+static void __exit nft_redir_ipv6_module_exit(void)
+{
+ nft_unregister_expr(&nft_redir_ipv6_type);
+}
+
+module_init(nft_redir_ipv6_module_init);
+module_exit(nft_redir_ipv6_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "redir");
diff --git a/net/ipv6/netfilter/nft_reject_ipv6.c b/net/ipv6/netfilter/nft_reject_ipv6.c
new file mode 100644
index 0000000..057deea
--- /dev/null
+++ b/net/ipv6/netfilter/nft_reject_ipv6.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
+ * Copyright (c) 2013 Eric Leblond <eric@regit.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nft_reject.h>
+#include <net/netfilter/ipv6/nf_reject.h>
+
+static void nft_reject_ipv6_eval(const struct nft_expr *expr,
+ struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ struct nft_reject *priv = nft_expr_priv(expr);
+
+ switch (priv->type) {
+ case NFT_REJECT_ICMP_UNREACH:
+ nf_send_unreach6(nft_net(pkt), pkt->skb, priv->icmp_code,
+ nft_hook(pkt));
+ break;
+ case NFT_REJECT_TCP_RST:
+ nf_send_reset6(nft_net(pkt), pkt->skb, nft_hook(pkt));
+ break;
+ default:
+ break;
+ }
+
+ regs->verdict.code = NF_DROP;
+}
+
+static struct nft_expr_type nft_reject_ipv6_type;
+static const struct nft_expr_ops nft_reject_ipv6_ops = {
+ .type = &nft_reject_ipv6_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
+ .eval = nft_reject_ipv6_eval,
+ .init = nft_reject_init,
+ .dump = nft_reject_dump,
+ .validate = nft_reject_validate,
+};
+
+static struct nft_expr_type nft_reject_ipv6_type __read_mostly = {
+ .family = NFPROTO_IPV6,
+ .name = "reject",
+ .ops = &nft_reject_ipv6_ops,
+ .policy = nft_reject_policy,
+ .maxattr = NFTA_REJECT_MAX,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_reject_ipv6_module_init(void)
+{
+ return nft_register_expr(&nft_reject_ipv6_type);
+}
+
+static void __exit nft_reject_ipv6_module_exit(void)
+{
+ nft_unregister_expr(&nft_reject_ipv6_type);
+}
+
+module_init(nft_reject_ipv6_module_init);
+module_exit(nft_reject_ipv6_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "reject");
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
new file mode 100644
index 0000000..4fe7c90
--- /dev/null
+++ b/net/ipv6/output_core.c
@@ -0,0 +1,180 @@
+/*
+ * IPv6 library code, needed by static components when full IPv6 support is
+ * not configured or static. These functions are needed by GSO/GRO implementation.
+ */
+#include <linux/export.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/addrconf.h>
+#include <net/secure_seq.h>
+#include <linux/netfilter.h>
+
+static u32 __ipv6_select_ident(struct net *net, u32 hashrnd,
+ const struct in6_addr *dst,
+ const struct in6_addr *src)
+{
+ u32 hash, id;
+
+ hash = __ipv6_addr_jhash(dst, hashrnd);
+ hash = __ipv6_addr_jhash(src, hash);
+ hash ^= net_hash_mix(net);
+
+ /* Treat id of 0 as unset and if we get 0 back from ip_idents_reserve,
+ * set the hight order instead thus minimizing possible future
+ * collisions.
+ */
+ id = ip_idents_reserve(hash, 1);
+ if (unlikely(!id))
+ id = 1 << 31;
+
+ return id;
+}
+
+/* This function exists only for tap drivers that must support broken
+ * clients requesting UFO without specifying an IPv6 fragment ID.
+ *
+ * This is similar to ipv6_select_ident() but we use an independent hash
+ * seed to limit information leakage.
+ *
+ * The network header must be set before calling this.
+ */
+__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb)
+{
+ static u32 ip6_proxy_idents_hashrnd __read_mostly;
+ struct in6_addr buf[2];
+ struct in6_addr *addrs;
+ u32 id;
+
+ addrs = skb_header_pointer(skb,
+ skb_network_offset(skb) +
+ offsetof(struct ipv6hdr, saddr),
+ sizeof(buf), buf);
+ if (!addrs)
+ return 0;
+
+ net_get_random_once(&ip6_proxy_idents_hashrnd,
+ sizeof(ip6_proxy_idents_hashrnd));
+
+ id = __ipv6_select_ident(net, ip6_proxy_idents_hashrnd,
+ &addrs[1], &addrs[0]);
+ return htonl(id);
+}
+EXPORT_SYMBOL_GPL(ipv6_proxy_select_ident);
+
+__be32 ipv6_select_ident(struct net *net,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
+{
+ static u32 ip6_idents_hashrnd __read_mostly;
+ u32 id;
+
+ net_get_random_once(&ip6_idents_hashrnd, sizeof(ip6_idents_hashrnd));
+
+ id = __ipv6_select_ident(net, ip6_idents_hashrnd, daddr, saddr);
+ return htonl(id);
+}
+EXPORT_SYMBOL(ipv6_select_ident);
+
+int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
+{
+ unsigned int offset = sizeof(struct ipv6hdr);
+ unsigned int packet_len = skb_tail_pointer(skb) -
+ skb_network_header(skb);
+ int found_rhdr = 0;
+ *nexthdr = &ipv6_hdr(skb)->nexthdr;
+
+ while (offset <= packet_len) {
+ struct ipv6_opt_hdr *exthdr;
+
+ switch (**nexthdr) {
+
+ case NEXTHDR_HOP:
+ break;
+ case NEXTHDR_ROUTING:
+ found_rhdr = 1;
+ break;
+ case NEXTHDR_DEST:
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
+ break;
+#endif
+ if (found_rhdr)
+ return offset;
+ break;
+ default:
+ return offset;
+ }
+
+ if (offset + sizeof(struct ipv6_opt_hdr) > packet_len)
+ return -EINVAL;
+
+ exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
+ offset);
+ offset += ipv6_optlen(exthdr);
+ if (offset > IPV6_MAXPLEN)
+ return -EINVAL;
+ *nexthdr = &exthdr->nexthdr;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL(ip6_find_1stfragopt);
+
+#if IS_ENABLED(CONFIG_IPV6)
+int ip6_dst_hoplimit(struct dst_entry *dst)
+{
+ int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
+ if (hoplimit == 0) {
+ struct net_device *dev = dst->dev;
+ struct inet6_dev *idev;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ if (idev)
+ hoplimit = idev->cnf.hop_limit;
+ else
+ hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
+ rcu_read_unlock();
+ }
+ return hoplimit;
+}
+EXPORT_SYMBOL(ip6_dst_hoplimit);
+#endif
+
+int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ int len;
+
+ len = skb->len - sizeof(struct ipv6hdr);
+ if (len > IPV6_MAXPLEN)
+ len = 0;
+ ipv6_hdr(skb)->payload_len = htons(len);
+ IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
+
+ /* if egress device is enslaved to an L3 master device pass the
+ * skb to its handler for processing
+ */
+ skb = l3mdev_ip6_out(sk, skb);
+ if (unlikely(!skb))
+ return 0;
+
+ skb->protocol = htons(ETH_P_IPV6);
+
+ return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
+ net, sk, skb, NULL, skb_dst(skb)->dev,
+ dst_output);
+}
+EXPORT_SYMBOL_GPL(__ip6_local_out);
+
+int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ int err;
+
+ err = __ip6_local_out(net, sk, skb);
+ if (likely(err == 1))
+ err = dst_output(net, sk, skb);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(ip6_local_out);
diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c
new file mode 100644
index 0000000..4c04bcc
--- /dev/null
+++ b/net/ipv6/ping.c
@@ -0,0 +1,274 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * "Ping" sockets
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Based on ipv4/ping.c code.
+ *
+ * Authors: Lorenzo Colitti (IPv6 support)
+ * Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6),
+ * Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32)
+ *
+ */
+
+#include <net/addrconf.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/protocol.h>
+#include <net/udp.h>
+#include <net/transp_v6.h>
+#include <linux/proc_fs.h>
+#include <net/ping.h>
+
+/* Compatibility glue so we can support IPv6 when it's compiled as a module */
+static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
+ int *addr_len)
+{
+ return -EAFNOSUPPORT;
+}
+static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
+ struct sk_buff *skb)
+{
+}
+static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
+{
+ return -EAFNOSUPPORT;
+}
+static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
+ __be16 port, u32 info, u8 *payload) {}
+static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
+ const struct net_device *dev, int strict)
+{
+ return 0;
+}
+
+static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct icmp6hdr user_icmph;
+ int addr_type;
+ struct in6_addr *daddr;
+ int oif = 0;
+ struct flowi6 fl6;
+ int err;
+ struct dst_entry *dst;
+ struct rt6_info *rt;
+ struct pingfakehdr pfh;
+ struct ipcm6_cookie ipc6;
+
+ pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
+
+ err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
+ sizeof(user_icmph));
+ if (err)
+ return err;
+
+ if (msg->msg_name) {
+ DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
+ if (msg->msg_namelen < sizeof(*u))
+ return -EINVAL;
+ if (u->sin6_family != AF_INET6) {
+ return -EAFNOSUPPORT;
+ }
+ daddr = &(u->sin6_addr);
+ if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr)))
+ oif = u->sin6_scope_id;
+ } else {
+ if (sk->sk_state != TCP_ESTABLISHED)
+ return -EDESTADDRREQ;
+ daddr = &sk->sk_v6_daddr;
+ }
+
+ if (!oif)
+ oif = sk->sk_bound_dev_if;
+
+ if (!oif)
+ oif = np->sticky_pktinfo.ipi6_ifindex;
+
+ if (!oif && ipv6_addr_is_multicast(daddr))
+ oif = np->mcast_oif;
+ else if (!oif)
+ oif = np->ucast_oif;
+
+ addr_type = ipv6_addr_type(daddr);
+ if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) ||
+ (addr_type & IPV6_ADDR_MAPPED) ||
+ (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if))
+ return -EINVAL;
+
+ /* TODO: use ip6_datagram_send_ctl to get options from cmsg */
+
+ memset(&fl6, 0, sizeof(fl6));
+
+ fl6.flowi6_proto = IPPROTO_ICMPV6;
+ fl6.saddr = np->saddr;
+ fl6.daddr = *daddr;
+ fl6.flowi6_oif = oif;
+ fl6.flowi6_mark = sk->sk_mark;
+ fl6.flowi6_uid = sk->sk_uid;
+ fl6.fl6_icmp_type = user_icmph.icmp6_type;
+ fl6.fl6_icmp_code = user_icmph.icmp6_code;
+ security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
+
+ ipcm6_init_sk(&ipc6, np);
+ fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
+
+ dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false);
+ if (IS_ERR(dst))
+ return PTR_ERR(dst);
+ rt = (struct rt6_info *) dst;
+
+ if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
+ fl6.flowi6_oif = np->mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
+
+ pfh.icmph.type = user_icmph.icmp6_type;
+ pfh.icmph.code = user_icmph.icmp6_code;
+ pfh.icmph.checksum = 0;
+ pfh.icmph.un.echo.id = inet->inet_sport;
+ pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
+ pfh.msg = msg;
+ pfh.wcheck = 0;
+ pfh.family = AF_INET6;
+
+ ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
+
+ lock_sock(sk);
+ err = ip6_append_data(sk, ping_getfrag, &pfh, len,
+ 0, &ipc6, &fl6, rt,
+ MSG_DONTWAIT);
+
+ if (err) {
+ ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
+ ICMP6_MIB_OUTERRORS);
+ ip6_flush_pending_frames(sk);
+ } else {
+ icmpv6_push_pending_frames(sk, &fl6,
+ (struct icmp6hdr *)&pfh.icmph, len);
+ }
+ release_sock(sk);
+
+ dst_release(dst);
+
+ if (err)
+ return err;
+
+ return len;
+}
+
+struct proto pingv6_prot = {
+ .name = "PINGv6",
+ .owner = THIS_MODULE,
+ .init = ping_init_sock,
+ .close = ping_close,
+ .connect = ip6_datagram_connect_v6_only,
+ .disconnect = __udp_disconnect,
+ .setsockopt = ipv6_setsockopt,
+ .getsockopt = ipv6_getsockopt,
+ .sendmsg = ping_v6_sendmsg,
+ .recvmsg = ping_recvmsg,
+ .bind = ping_bind,
+ .backlog_rcv = ping_queue_rcv_skb,
+ .hash = ping_hash,
+ .unhash = ping_unhash,
+ .get_port = ping_get_port,
+ .obj_size = sizeof(struct raw6_sock),
+};
+EXPORT_SYMBOL_GPL(pingv6_prot);
+
+static struct inet_protosw pingv6_protosw = {
+ .type = SOCK_DGRAM,
+ .protocol = IPPROTO_ICMPV6,
+ .prot = &pingv6_prot,
+ .ops = &inet6_sockraw_ops,
+ .flags = INET_PROTOSW_REUSE,
+};
+
+#ifdef CONFIG_PROC_FS
+static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ return ping_seq_start(seq, pos, AF_INET6);
+}
+
+static int ping_v6_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
+ } else {
+ int bucket = ((struct ping_iter_state *) seq->private)->bucket;
+ struct inet_sock *inet = inet_sk(v);
+ __u16 srcp = ntohs(inet->inet_sport);
+ __u16 destp = ntohs(inet->inet_dport);
+ ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
+ }
+ return 0;
+}
+
+static const struct seq_operations ping_v6_seq_ops = {
+ .start = ping_v6_seq_start,
+ .show = ping_v6_seq_show,
+ .next = ping_seq_next,
+ .stop = ping_seq_stop,
+};
+
+static int __net_init ping_v6_proc_init_net(struct net *net)
+{
+ if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops,
+ sizeof(struct ping_iter_state)))
+ return -ENOMEM;
+ return 0;
+}
+
+static void __net_init ping_v6_proc_exit_net(struct net *net)
+{
+ remove_proc_entry("icmp6", net->proc_net);
+}
+
+static struct pernet_operations ping_v6_net_ops = {
+ .init = ping_v6_proc_init_net,
+ .exit = ping_v6_proc_exit_net,
+};
+#endif
+
+int __init pingv6_init(void)
+{
+#ifdef CONFIG_PROC_FS
+ int ret = register_pernet_subsys(&ping_v6_net_ops);
+ if (ret)
+ return ret;
+#endif
+ pingv6_ops.ipv6_recv_error = ipv6_recv_error;
+ pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
+ pingv6_ops.ip6_datagram_recv_specific_ctl =
+ ip6_datagram_recv_specific_ctl;
+ pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
+ pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
+ pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
+ return inet6_register_protosw(&pingv6_protosw);
+}
+
+/* This never gets called because it's not possible to unload the ipv6 module,
+ * but just in case.
+ */
+void pingv6_exit(void)
+{
+ pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
+ pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
+ pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
+ pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
+ pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
+ pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
+#ifdef CONFIG_PROC_FS
+ unregister_pernet_subsys(&ping_v6_net_ops);
+#endif
+ inet6_unregister_protosw(&pingv6_protosw);
+}
diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
new file mode 100644
index 0000000..2356b4a
--- /dev/null
+++ b/net/ipv6/proc.c
@@ -0,0 +1,321 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * This file implements the various access functions for the
+ * PROC file system. This is very similar to the IPv4 version,
+ * except it reports the sockets in the INET6 address family.
+ *
+ * Authors: David S. Miller (davem@caip.rutgers.edu)
+ * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/socket.h>
+#include <linux/net.h>
+#include <linux/ipv6.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/stddef.h>
+#include <linux/export.h>
+#include <net/net_namespace.h>
+#include <net/ip.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <net/transp_v6.h>
+#include <net/ipv6.h>
+
+#define MAX4(a, b, c, d) \
+ max_t(u32, max_t(u32, a, b), max_t(u32, c, d))
+#define SNMP_MIB_MAX MAX4(UDP_MIB_MAX, TCP_MIB_MAX, \
+ IPSTATS_MIB_MAX, ICMP_MIB_MAX)
+
+static int sockstat6_seq_show(struct seq_file *seq, void *v)
+{
+ struct net *net = seq->private;
+
+ seq_printf(seq, "TCP6: inuse %d\n",
+ sock_prot_inuse_get(net, &tcpv6_prot));
+ seq_printf(seq, "UDP6: inuse %d\n",
+ sock_prot_inuse_get(net, &udpv6_prot));
+ seq_printf(seq, "UDPLITE6: inuse %d\n",
+ sock_prot_inuse_get(net, &udplitev6_prot));
+ seq_printf(seq, "RAW6: inuse %d\n",
+ sock_prot_inuse_get(net, &rawv6_prot));
+ seq_printf(seq, "FRAG6: inuse %u memory %lu\n",
+ atomic_read(&net->ipv6.frags.rhashtable.nelems),
+ frag_mem_limit(&net->ipv6.frags));
+ return 0;
+}
+
+static const struct snmp_mib snmp6_ipstats_list[] = {
+/* ipv6 mib according to RFC 2465 */
+ SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS),
+ SNMP_MIB_ITEM("Ip6InHdrErrors", IPSTATS_MIB_INHDRERRORS),
+ SNMP_MIB_ITEM("Ip6InTooBigErrors", IPSTATS_MIB_INTOOBIGERRORS),
+ SNMP_MIB_ITEM("Ip6InNoRoutes", IPSTATS_MIB_INNOROUTES),
+ SNMP_MIB_ITEM("Ip6InAddrErrors", IPSTATS_MIB_INADDRERRORS),
+ SNMP_MIB_ITEM("Ip6InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
+ SNMP_MIB_ITEM("Ip6InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
+ SNMP_MIB_ITEM("Ip6InDiscards", IPSTATS_MIB_INDISCARDS),
+ SNMP_MIB_ITEM("Ip6InDelivers", IPSTATS_MIB_INDELIVERS),
+ SNMP_MIB_ITEM("Ip6OutForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
+ SNMP_MIB_ITEM("Ip6OutRequests", IPSTATS_MIB_OUTPKTS),
+ SNMP_MIB_ITEM("Ip6OutDiscards", IPSTATS_MIB_OUTDISCARDS),
+ SNMP_MIB_ITEM("Ip6OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
+ SNMP_MIB_ITEM("Ip6ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
+ SNMP_MIB_ITEM("Ip6ReasmReqds", IPSTATS_MIB_REASMREQDS),
+ SNMP_MIB_ITEM("Ip6ReasmOKs", IPSTATS_MIB_REASMOKS),
+ SNMP_MIB_ITEM("Ip6ReasmFails", IPSTATS_MIB_REASMFAILS),
+ SNMP_MIB_ITEM("Ip6FragOKs", IPSTATS_MIB_FRAGOKS),
+ SNMP_MIB_ITEM("Ip6FragFails", IPSTATS_MIB_FRAGFAILS),
+ SNMP_MIB_ITEM("Ip6FragCreates", IPSTATS_MIB_FRAGCREATES),
+ SNMP_MIB_ITEM("Ip6InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
+ SNMP_MIB_ITEM("Ip6OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
+ SNMP_MIB_ITEM("Ip6InOctets", IPSTATS_MIB_INOCTETS),
+ SNMP_MIB_ITEM("Ip6OutOctets", IPSTATS_MIB_OUTOCTETS),
+ SNMP_MIB_ITEM("Ip6InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
+ SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
+ SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
+ SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
+ /* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */
+ SNMP_MIB_ITEM("Ip6InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
+ SNMP_MIB_ITEM("Ip6InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
+ SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
+ SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS),
+ SNMP_MIB_SENTINEL
+};
+
+static const struct snmp_mib snmp6_icmp6_list[] = {
+/* icmpv6 mib according to RFC 2466 */
+ SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS),
+ SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS),
+ SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
+ SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
+ SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
+ SNMP_MIB_SENTINEL
+};
+
+/* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
+static const char *const icmp6type2name[256] = {
+ [ICMPV6_DEST_UNREACH] = "DestUnreachs",
+ [ICMPV6_PKT_TOOBIG] = "PktTooBigs",
+ [ICMPV6_TIME_EXCEED] = "TimeExcds",
+ [ICMPV6_PARAMPROB] = "ParmProblems",
+ [ICMPV6_ECHO_REQUEST] = "Echos",
+ [ICMPV6_ECHO_REPLY] = "EchoReplies",
+ [ICMPV6_MGM_QUERY] = "GroupMembQueries",
+ [ICMPV6_MGM_REPORT] = "GroupMembResponses",
+ [ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
+ [ICMPV6_MLD2_REPORT] = "MLDv2Reports",
+ [NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
+ [NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
+ [NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
+ [NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
+ [NDISC_REDIRECT] = "Redirects",
+};
+
+
+static const struct snmp_mib snmp6_udp6_list[] = {
+ SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
+ SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
+ SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
+ SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
+ SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
+ SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
+ SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
+ SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
+ SNMP_MIB_SENTINEL
+};
+
+static const struct snmp_mib snmp6_udplite6_list[] = {
+ SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
+ SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
+ SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
+ SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
+ SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
+ SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
+ SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
+ SNMP_MIB_SENTINEL
+};
+
+static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
+{
+ char name[32];
+ int i;
+
+ /* print by name -- deprecated items */
+ for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
+ int icmptype;
+ const char *p;
+
+ icmptype = i & 0xff;
+ p = icmp6type2name[icmptype];
+ if (!p) /* don't print un-named types here */
+ continue;
+ snprintf(name, sizeof(name), "Icmp6%s%s",
+ i & 0x100 ? "Out" : "In", p);
+ seq_printf(seq, "%-32s\t%lu\n", name,
+ atomic_long_read(smib + i));
+ }
+
+ /* print by number (nonzero only) - ICMPMsgStat format */
+ for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
+ unsigned long val;
+
+ val = atomic_long_read(smib + i);
+ if (!val)
+ continue;
+ snprintf(name, sizeof(name), "Icmp6%sType%u",
+ i & 0x100 ? "Out" : "In", i & 0xff);
+ seq_printf(seq, "%-32s\t%lu\n", name, val);
+ }
+}
+
+/* can be called either with percpu mib (pcpumib != NULL),
+ * or shared one (smib != NULL)
+ */
+static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
+ atomic_long_t *smib,
+ const struct snmp_mib *itemlist)
+{
+ unsigned long buff[SNMP_MIB_MAX];
+ int i;
+
+ if (pcpumib) {
+ memset(buff, 0, sizeof(unsigned long) * SNMP_MIB_MAX);
+
+ snmp_get_cpu_field_batch(buff, itemlist, pcpumib);
+ for (i = 0; itemlist[i].name; i++)
+ seq_printf(seq, "%-32s\t%lu\n",
+ itemlist[i].name, buff[i]);
+ } else {
+ for (i = 0; itemlist[i].name; i++)
+ seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
+ atomic_long_read(smib + itemlist[i].entry));
+ }
+}
+
+static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
+ const struct snmp_mib *itemlist, size_t syncpoff)
+{
+ u64 buff64[SNMP_MIB_MAX];
+ int i;
+
+ memset(buff64, 0, sizeof(u64) * SNMP_MIB_MAX);
+
+ snmp_get_cpu_field64_batch(buff64, itemlist, mib, syncpoff);
+ for (i = 0; itemlist[i].name; i++)
+ seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
+}
+
+static int snmp6_seq_show(struct seq_file *seq, void *v)
+{
+ struct net *net = (struct net *)seq->private;
+
+ snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
+ snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
+ snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
+ NULL, snmp6_icmp6_list);
+ snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
+ snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
+ NULL, snmp6_udp6_list);
+ snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
+ NULL, snmp6_udplite6_list);
+ return 0;
+}
+
+static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
+{
+ struct inet6_dev *idev = (struct inet6_dev *)seq->private;
+
+ seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
+ snmp6_seq_show_item64(seq, idev->stats.ipv6,
+ snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
+ snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
+ snmp6_icmp6_list);
+ snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
+ return 0;
+}
+
+int snmp6_register_dev(struct inet6_dev *idev)
+{
+ struct proc_dir_entry *p;
+ struct net *net;
+
+ if (!idev || !idev->dev)
+ return -EINVAL;
+
+ net = dev_net(idev->dev);
+ if (!net->mib.proc_net_devsnmp6)
+ return -ENOENT;
+
+ p = proc_create_single_data(idev->dev->name, 0444,
+ net->mib.proc_net_devsnmp6, snmp6_dev_seq_show, idev);
+ if (!p)
+ return -ENOMEM;
+
+ idev->stats.proc_dir_entry = p;
+ return 0;
+}
+
+int snmp6_unregister_dev(struct inet6_dev *idev)
+{
+ struct net *net = dev_net(idev->dev);
+ if (!net->mib.proc_net_devsnmp6)
+ return -ENOENT;
+ if (!idev->stats.proc_dir_entry)
+ return -EINVAL;
+ proc_remove(idev->stats.proc_dir_entry);
+ idev->stats.proc_dir_entry = NULL;
+ return 0;
+}
+
+static int __net_init ipv6_proc_init_net(struct net *net)
+{
+ if (!proc_create_net_single("sockstat6", 0444, net->proc_net,
+ sockstat6_seq_show, NULL))
+ return -ENOMEM;
+
+ if (!proc_create_net_single("snmp6", 0444, net->proc_net,
+ snmp6_seq_show, NULL))
+ goto proc_snmp6_fail;
+
+ net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);
+ if (!net->mib.proc_net_devsnmp6)
+ goto proc_dev_snmp6_fail;
+ return 0;
+
+proc_dev_snmp6_fail:
+ remove_proc_entry("snmp6", net->proc_net);
+proc_snmp6_fail:
+ remove_proc_entry("sockstat6", net->proc_net);
+ return -ENOMEM;
+}
+
+static void __net_exit ipv6_proc_exit_net(struct net *net)
+{
+ remove_proc_entry("sockstat6", net->proc_net);
+ remove_proc_entry("dev_snmp6", net->proc_net);
+ remove_proc_entry("snmp6", net->proc_net);
+}
+
+static struct pernet_operations ipv6_proc_ops = {
+ .init = ipv6_proc_init_net,
+ .exit = ipv6_proc_exit_net,
+};
+
+int __init ipv6_misc_proc_init(void)
+{
+ return register_pernet_subsys(&ipv6_proc_ops);
+}
+
+void ipv6_misc_proc_exit(void)
+{
+ unregister_pernet_subsys(&ipv6_proc_ops);
+}
diff --git a/net/ipv6/protocol.c b/net/ipv6/protocol.c
new file mode 100644
index 0000000..b5d54d4
--- /dev/null
+++ b/net/ipv6/protocol.c
@@ -0,0 +1,74 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * PF_INET6 protocol dispatch tables.
+ *
+ * Authors: Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * Changes:
+ *
+ * Vince Laviano (vince@cs.stanford.edu) 16 May 2001
+ * - Removed unused variable 'inet6_protocol_base'
+ * - Modified inet6_del_protocol() to correctly maintain copy bit.
+ */
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/spinlock.h>
+#include <net/protocol.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
+EXPORT_SYMBOL(inet6_protos);
+
+int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
+{
+ return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
+ NULL, prot) ? 0 : -1;
+}
+EXPORT_SYMBOL(inet6_add_protocol);
+
+int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
+{
+ int ret;
+
+ ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
+ prot, NULL) == prot) ? 0 : -1;
+
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL(inet6_del_protocol);
+#endif
+
+const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
+EXPORT_SYMBOL(inet6_offloads);
+
+int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
+{
+ return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
+ NULL, prot) ? 0 : -1;
+}
+EXPORT_SYMBOL(inet6_add_offload);
+
+int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
+{
+ int ret;
+
+ ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
+ prot, NULL) == prot) ? 0 : -1;
+
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL(inet6_del_offload);
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
new file mode 100644
index 0000000..5e0efd3
--- /dev/null
+++ b/net/ipv6/raw.c
@@ -0,0 +1,1388 @@
+/*
+ * RAW sockets for IPv6
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Adapted from linux/net/ipv4/raw.c
+ *
+ * Fixes:
+ * Hideaki YOSHIFUJI : sin6_scope_id support
+ * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
+ * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/slab.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/icmpv6.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/skbuff.h>
+#include <linux/compat.h>
+#include <linux/uaccess.h>
+#include <asm/ioctls.h>
+
+#include <net/net_namespace.h>
+#include <net/ip.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/protocol.h>
+#include <net/ip6_route.h>
+#include <net/ip6_checksum.h>
+#include <net/addrconf.h>
+#include <net/transp_v6.h>
+#include <net/udp.h>
+#include <net/inet_common.h>
+#include <net/tcp_states.h>
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+#include <net/mip6.h>
+#endif
+#include <linux/mroute6.h>
+
+#include <net/raw.h>
+#include <net/rawv6.h>
+#include <net/xfrm.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/export.h>
+
+#define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */
+
+struct raw_hashinfo raw_v6_hashinfo = {
+ .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
+};
+EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
+
+struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
+ unsigned short num, const struct in6_addr *loc_addr,
+ const struct in6_addr *rmt_addr, int dif, int sdif)
+{
+ bool is_multicast = ipv6_addr_is_multicast(loc_addr);
+
+ sk_for_each_from(sk)
+ if (inet_sk(sk)->inet_num == num) {
+
+ if (!net_eq(sock_net(sk), net))
+ continue;
+
+ if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
+ !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
+ continue;
+
+ if (sk->sk_bound_dev_if &&
+ sk->sk_bound_dev_if != dif &&
+ sk->sk_bound_dev_if != sdif)
+ continue;
+
+ if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
+ if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
+ goto found;
+ if (is_multicast &&
+ inet6_mc_check(sk, loc_addr, rmt_addr))
+ goto found;
+ continue;
+ }
+ goto found;
+ }
+ sk = NULL;
+found:
+ return sk;
+}
+EXPORT_SYMBOL_GPL(__raw_v6_lookup);
+
+/*
+ * 0 - deliver
+ * 1 - block
+ */
+static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
+{
+ struct icmp6hdr _hdr;
+ const struct icmp6hdr *hdr;
+
+ /* We require only the four bytes of the ICMPv6 header, not any
+ * additional bytes of message body in "struct icmp6hdr".
+ */
+ hdr = skb_header_pointer(skb, skb_transport_offset(skb),
+ ICMPV6_HDRLEN, &_hdr);
+ if (hdr) {
+ const __u32 *data = &raw6_sk(sk)->filter.data[0];
+ unsigned int type = hdr->icmp6_type;
+
+ return (data[type >> 5] & (1U << (type & 31))) != 0;
+ }
+ return 1;
+}
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
+
+static mh_filter_t __rcu *mh_filter __read_mostly;
+
+int rawv6_mh_filter_register(mh_filter_t filter)
+{
+ rcu_assign_pointer(mh_filter, filter);
+ return 0;
+}
+EXPORT_SYMBOL(rawv6_mh_filter_register);
+
+int rawv6_mh_filter_unregister(mh_filter_t filter)
+{
+ RCU_INIT_POINTER(mh_filter, NULL);
+ synchronize_rcu();
+ return 0;
+}
+EXPORT_SYMBOL(rawv6_mh_filter_unregister);
+
+#endif
+
+/*
+ * demultiplex raw sockets.
+ * (should consider queueing the skb in the sock receive_queue
+ * without calling rawv6.c)
+ *
+ * Caller owns SKB so we must make clones.
+ */
+static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
+{
+ const struct in6_addr *saddr;
+ const struct in6_addr *daddr;
+ struct sock *sk;
+ bool delivered = false;
+ __u8 hash;
+ struct net *net;
+
+ saddr = &ipv6_hdr(skb)->saddr;
+ daddr = saddr + 1;
+
+ hash = nexthdr & (RAW_HTABLE_SIZE - 1);
+
+ read_lock(&raw_v6_hashinfo.lock);
+ sk = sk_head(&raw_v6_hashinfo.ht[hash]);
+
+ if (!sk)
+ goto out;
+
+ net = dev_net(skb->dev);
+ sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr,
+ inet6_iif(skb), inet6_sdif(skb));
+
+ while (sk) {
+ int filtered;
+
+ delivered = true;
+ switch (nexthdr) {
+ case IPPROTO_ICMPV6:
+ filtered = icmpv6_filter(sk, skb);
+ break;
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ case IPPROTO_MH:
+ {
+ /* XXX: To validate MH only once for each packet,
+ * this is placed here. It should be after checking
+ * xfrm policy, however it doesn't. The checking xfrm
+ * policy is placed in rawv6_rcv() because it is
+ * required for each socket.
+ */
+ mh_filter_t *filter;
+
+ filter = rcu_dereference(mh_filter);
+ filtered = filter ? (*filter)(sk, skb) : 0;
+ break;
+ }
+#endif
+ default:
+ filtered = 0;
+ break;
+ }
+
+ if (filtered < 0)
+ break;
+ if (filtered == 0) {
+ struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
+
+ /* Not releasing hash table! */
+ if (clone) {
+ nf_reset(clone);
+ rawv6_rcv(sk, clone);
+ }
+ }
+ sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
+ inet6_iif(skb), inet6_sdif(skb));
+ }
+out:
+ read_unlock(&raw_v6_hashinfo.lock);
+ return delivered;
+}
+
+bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
+{
+ struct sock *raw_sk;
+
+ raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
+ if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
+ raw_sk = NULL;
+
+ return raw_sk != NULL;
+}
+
+/* This cleans up af_inet6 a bit. -DaveM */
+static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
+ __be32 v4addr = 0;
+ int addr_type;
+ int err;
+
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+
+ if (addr->sin6_family != AF_INET6)
+ return -EINVAL;
+
+ addr_type = ipv6_addr_type(&addr->sin6_addr);
+
+ /* Raw sockets are IPv6 only */
+ if (addr_type == IPV6_ADDR_MAPPED)
+ return -EADDRNOTAVAIL;
+
+ lock_sock(sk);
+
+ err = -EINVAL;
+ if (sk->sk_state != TCP_CLOSE)
+ goto out;
+
+ rcu_read_lock();
+ /* Check if the address belongs to the host. */
+ if (addr_type != IPV6_ADDR_ANY) {
+ struct net_device *dev = NULL;
+
+ if (__ipv6_addr_needs_scope_id(addr_type)) {
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ addr->sin6_scope_id) {
+ /* Override any existing binding, if another
+ * one is supplied by user.
+ */
+ sk->sk_bound_dev_if = addr->sin6_scope_id;
+ }
+
+ /* Binding to link-local address requires an interface */
+ if (!sk->sk_bound_dev_if)
+ goto out_unlock;
+
+ err = -ENODEV;
+ dev = dev_get_by_index_rcu(sock_net(sk),
+ sk->sk_bound_dev_if);
+ if (!dev)
+ goto out_unlock;
+ }
+
+ /* ipv4 addr of the socket is invalid. Only the
+ * unspecified and mapped address have a v4 equivalent.
+ */
+ v4addr = LOOPBACK4_IPV6;
+ if (!(addr_type & IPV6_ADDR_MULTICAST) &&
+ !sock_net(sk)->ipv6.sysctl.ip_nonlocal_bind) {
+ err = -EADDRNOTAVAIL;
+ if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
+ dev, 0)) {
+ goto out_unlock;
+ }
+ }
+ }
+
+ inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
+ sk->sk_v6_rcv_saddr = addr->sin6_addr;
+ if (!(addr_type & IPV6_ADDR_MULTICAST))
+ np->saddr = addr->sin6_addr;
+ err = 0;
+out_unlock:
+ rcu_read_unlock();
+out:
+ release_sock(sk);
+ return err;
+}
+
+static void rawv6_err(struct sock *sk, struct sk_buff *skb,
+ struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ int err;
+ int harderr;
+
+ /* Report error on raw socket, if:
+ 1. User requested recverr.
+ 2. Socket is connected (otherwise the error indication
+ is useless without recverr and error is hard.
+ */
+ if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
+ return;
+
+ harderr = icmpv6_err_convert(type, code, &err);
+ if (type == ICMPV6_PKT_TOOBIG) {
+ ip6_sk_update_pmtu(skb, sk, info);
+ harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
+ }
+ if (type == NDISC_REDIRECT) {
+ ip6_sk_redirect(skb, sk);
+ return;
+ }
+ if (np->recverr) {
+ u8 *payload = skb->data;
+ if (!inet->hdrincl)
+ payload += offset;
+ ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
+ }
+
+ if (np->recverr || harderr) {
+ sk->sk_err = err;
+ sk->sk_error_report(sk);
+ }
+}
+
+void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
+ u8 type, u8 code, int inner_offset, __be32 info)
+{
+ struct sock *sk;
+ int hash;
+ const struct in6_addr *saddr, *daddr;
+ struct net *net;
+
+ hash = nexthdr & (RAW_HTABLE_SIZE - 1);
+
+ read_lock(&raw_v6_hashinfo.lock);
+ sk = sk_head(&raw_v6_hashinfo.ht[hash]);
+ if (sk) {
+ /* Note: ipv6_hdr(skb) != skb->data */
+ const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
+ saddr = &ip6h->saddr;
+ daddr = &ip6h->daddr;
+ net = dev_net(skb->dev);
+
+ while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
+ inet6_iif(skb), inet6_iif(skb)))) {
+ rawv6_err(sk, skb, NULL, type, code,
+ inner_offset, info);
+ sk = sk_next(sk);
+ }
+ }
+ read_unlock(&raw_v6_hashinfo.lock);
+}
+
+static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+ if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
+ skb_checksum_complete(skb)) {
+ atomic_inc(&sk->sk_drops);
+ kfree_skb(skb);
+ return NET_RX_DROP;
+ }
+
+ /* Charge it to the socket. */
+ skb_dst_drop(skb);
+ if (sock_queue_rcv_skb(sk, skb) < 0) {
+ kfree_skb(skb);
+ return NET_RX_DROP;
+ }
+
+ return 0;
+}
+
+/*
+ * This is next to useless...
+ * if we demultiplex in network layer we don't need the extra call
+ * just to queue the skb...
+ * maybe we could have the network decide upon a hint if it
+ * should call raw_rcv for demultiplexing
+ */
+int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct raw6_sock *rp = raw6_sk(sk);
+
+ if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
+ atomic_inc(&sk->sk_drops);
+ kfree_skb(skb);
+ return NET_RX_DROP;
+ }
+
+ if (!rp->checksum)
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ skb_postpull_rcsum(skb, skb_network_header(skb),
+ skb_network_header_len(skb));
+ if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ skb->len, inet->inet_num, skb->csum))
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ if (!skb_csum_unnecessary(skb))
+ skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ skb->len,
+ inet->inet_num, 0));
+
+ if (inet->hdrincl) {
+ if (skb_checksum_complete(skb)) {
+ atomic_inc(&sk->sk_drops);
+ kfree_skb(skb);
+ return NET_RX_DROP;
+ }
+ }
+
+ rawv6_rcv_skb(sk, skb);
+ return 0;
+}
+
+
+/*
+ * This should be easy, if there is something there
+ * we return it, otherwise we block.
+ */
+
+static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
+ int noblock, int flags, int *addr_len)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
+ struct sk_buff *skb;
+ size_t copied;
+ int err;
+
+ if (flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ if (flags & MSG_ERRQUEUE)
+ return ipv6_recv_error(sk, msg, len, addr_len);
+
+ if (np->rxpmtu && np->rxopt.bits.rxpmtu)
+ return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
+
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ if (!skb)
+ goto out;
+
+ copied = skb->len;
+ if (copied > len) {
+ copied = len;
+ msg->msg_flags |= MSG_TRUNC;
+ }
+
+ if (skb_csum_unnecessary(skb)) {
+ err = skb_copy_datagram_msg(skb, 0, msg, copied);
+ } else if (msg->msg_flags&MSG_TRUNC) {
+ if (__skb_checksum_complete(skb))
+ goto csum_copy_err;
+ err = skb_copy_datagram_msg(skb, 0, msg, copied);
+ } else {
+ err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
+ if (err == -EINVAL)
+ goto csum_copy_err;
+ }
+ if (err)
+ goto out_free;
+
+ /* Copy the address. */
+ if (sin6) {
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = 0;
+ sin6->sin6_addr = ipv6_hdr(skb)->saddr;
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
+ inet6_iif(skb));
+ *addr_len = sizeof(*sin6);
+ }
+
+ sock_recv_ts_and_drops(msg, sk, skb);
+
+ if (np->rxopt.all)
+ ip6_datagram_recv_ctl(sk, msg, skb);
+
+ err = copied;
+ if (flags & MSG_TRUNC)
+ err = skb->len;
+
+out_free:
+ skb_free_datagram(sk, skb);
+out:
+ return err;
+
+csum_copy_err:
+ skb_kill_datagram(sk, skb, flags);
+
+ /* Error for blocking case is chosen to masquerade
+ as some normal condition.
+ */
+ err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
+ goto out;
+}
+
+static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
+ struct raw6_sock *rp)
+{
+ struct sk_buff *skb;
+ int err = 0;
+ int offset;
+ int len;
+ int total_len;
+ __wsum tmp_csum;
+ __sum16 csum;
+
+ if (!rp->checksum)
+ goto send;
+
+ skb = skb_peek(&sk->sk_write_queue);
+ if (!skb)
+ goto out;
+
+ offset = rp->offset;
+ total_len = inet_sk(sk)->cork.base.length;
+ if (offset >= total_len - 1) {
+ err = -EINVAL;
+ ip6_flush_pending_frames(sk);
+ goto out;
+ }
+
+ /* should be check HW csum miyazawa */
+ if (skb_queue_len(&sk->sk_write_queue) == 1) {
+ /*
+ * Only one fragment on the socket.
+ */
+ tmp_csum = skb->csum;
+ } else {
+ struct sk_buff *csum_skb = NULL;
+ tmp_csum = 0;
+
+ skb_queue_walk(&sk->sk_write_queue, skb) {
+ tmp_csum = csum_add(tmp_csum, skb->csum);
+
+ if (csum_skb)
+ continue;
+
+ len = skb->len - skb_transport_offset(skb);
+ if (offset >= len) {
+ offset -= len;
+ continue;
+ }
+
+ csum_skb = skb;
+ }
+
+ skb = csum_skb;
+ }
+
+ offset += skb_transport_offset(skb);
+ err = skb_copy_bits(skb, offset, &csum, 2);
+ if (err < 0) {
+ ip6_flush_pending_frames(sk);
+ goto out;
+ }
+
+ /* in case cksum was not initialized */
+ if (unlikely(csum))
+ tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
+
+ csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
+ total_len, fl6->flowi6_proto, tmp_csum);
+
+ if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
+ csum = CSUM_MANGLED_0;
+
+ BUG_ON(skb_store_bits(skb, offset, &csum, 2));
+
+send:
+ err = ip6_push_pending_frames(sk);
+out:
+ return err;
+}
+
+static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
+ struct flowi6 *fl6, struct dst_entry **dstp,
+ unsigned int flags, const struct sockcm_cookie *sockc)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct net *net = sock_net(sk);
+ struct ipv6hdr *iph;
+ struct sk_buff *skb;
+ int err;
+ struct rt6_info *rt = (struct rt6_info *)*dstp;
+ int hlen = LL_RESERVED_SPACE(rt->dst.dev);
+ int tlen = rt->dst.dev->needed_tailroom;
+
+ if (length > rt->dst.dev->mtu) {
+ ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
+ return -EMSGSIZE;
+ }
+ if (length < sizeof(struct ipv6hdr))
+ return -EINVAL;
+ if (flags&MSG_PROBE)
+ goto out;
+
+ skb = sock_alloc_send_skb(sk,
+ length + hlen + tlen + 15,
+ flags & MSG_DONTWAIT, &err);
+ if (!skb)
+ goto error;
+ skb_reserve(skb, hlen);
+
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->priority = sk->sk_priority;
+ skb->mark = sk->sk_mark;
+ skb->tstamp = sockc->transmit_time;
+
+ skb_put(skb, length);
+ skb_reset_network_header(skb);
+ iph = ipv6_hdr(skb);
+
+ skb->ip_summed = CHECKSUM_NONE;
+
+ if (flags & MSG_CONFIRM)
+ skb_set_dst_pending_confirm(skb, 1);
+
+ skb->transport_header = skb->network_header;
+ err = memcpy_from_msg(iph, msg, length);
+ if (err) {
+ err = -EFAULT;
+ kfree_skb(skb);
+ goto error;
+ }
+
+ skb_dst_set(skb, &rt->dst);
+ *dstp = NULL;
+
+ /* if egress device is enslaved to an L3 master device pass the
+ * skb to its handler for processing
+ */
+ skb = l3mdev_ip6_out(sk, skb);
+ if (unlikely(!skb))
+ return 0;
+
+ /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
+ * in the error path. Since skb has been freed, the dst could
+ * have been queued for deletion.
+ */
+ rcu_read_lock();
+ IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
+ err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
+ NULL, rt->dst.dev, dst_output);
+ if (err > 0)
+ err = net_xmit_errno(err);
+ if (err) {
+ IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
+ rcu_read_unlock();
+ goto error_check;
+ }
+ rcu_read_unlock();
+out:
+ return 0;
+
+error:
+ IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
+error_check:
+ if (err == -ENOBUFS && !np->recverr)
+ err = 0;
+ return err;
+}
+
+struct raw6_frag_vec {
+ struct msghdr *msg;
+ int hlen;
+ char c[4];
+};
+
+static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
+{
+ int err = 0;
+ switch (fl6->flowi6_proto) {
+ case IPPROTO_ICMPV6:
+ rfv->hlen = 2;
+ err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
+ if (!err) {
+ fl6->fl6_icmp_type = rfv->c[0];
+ fl6->fl6_icmp_code = rfv->c[1];
+ }
+ break;
+ case IPPROTO_MH:
+ rfv->hlen = 4;
+ err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
+ if (!err)
+ fl6->fl6_mh_type = rfv->c[2];
+ }
+ return err;
+}
+
+static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
+ struct sk_buff *skb)
+{
+ struct raw6_frag_vec *rfv = from;
+
+ if (offset < rfv->hlen) {
+ int copy = min(rfv->hlen - offset, len);
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL)
+ memcpy(to, rfv->c + offset, copy);
+ else
+ skb->csum = csum_block_add(
+ skb->csum,
+ csum_partial_copy_nocheck(rfv->c + offset,
+ to, copy, 0),
+ odd);
+
+ odd = 0;
+ offset += copy;
+ to += copy;
+ len -= copy;
+
+ if (!len)
+ return 0;
+ }
+
+ offset -= rfv->hlen;
+
+ return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
+}
+
+static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
+{
+ struct ipv6_txoptions *opt_to_free = NULL;
+ struct ipv6_txoptions opt_space;
+ DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
+ struct in6_addr *daddr, *final_p, final;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct raw6_sock *rp = raw6_sk(sk);
+ struct ipv6_txoptions *opt = NULL;
+ struct ip6_flowlabel *flowlabel = NULL;
+ struct dst_entry *dst = NULL;
+ struct raw6_frag_vec rfv;
+ struct flowi6 fl6;
+ struct ipcm6_cookie ipc6;
+ int addr_len = msg->msg_namelen;
+ u16 proto;
+ int err;
+
+ /* Rough check on arithmetic overflow,
+ better check is made in ip6_append_data().
+ */
+ if (len > INT_MAX)
+ return -EMSGSIZE;
+
+ /* Mirror BSD error message compatibility */
+ if (msg->msg_flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ /*
+ * Get and verify the address.
+ */
+ memset(&fl6, 0, sizeof(fl6));
+
+ fl6.flowi6_mark = sk->sk_mark;
+ fl6.flowi6_uid = sk->sk_uid;
+
+ ipcm6_init(&ipc6);
+ ipc6.sockc.tsflags = sk->sk_tsflags;
+
+ if (sin6) {
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+
+ if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
+ return -EAFNOSUPPORT;
+
+ /* port is the proto value [0..255] carried in nexthdr */
+ proto = ntohs(sin6->sin6_port);
+
+ if (!proto)
+ proto = inet->inet_num;
+ else if (proto != inet->inet_num)
+ return -EINVAL;
+
+ if (proto > 255)
+ return -EINVAL;
+
+ daddr = &sin6->sin6_addr;
+ if (np->sndflow) {
+ fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
+ if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
+ flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
+ if (!flowlabel)
+ return -EINVAL;
+ }
+ }
+
+ /*
+ * Otherwise it will be difficult to maintain
+ * sk->sk_dst_cache.
+ */
+ if (sk->sk_state == TCP_ESTABLISHED &&
+ ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
+ daddr = &sk->sk_v6_daddr;
+
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ sin6->sin6_scope_id &&
+ __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
+ fl6.flowi6_oif = sin6->sin6_scope_id;
+ } else {
+ if (sk->sk_state != TCP_ESTABLISHED)
+ return -EDESTADDRREQ;
+
+ proto = inet->inet_num;
+ daddr = &sk->sk_v6_daddr;
+ fl6.flowlabel = np->flow_label;
+ }
+
+ if (fl6.flowi6_oif == 0)
+ fl6.flowi6_oif = sk->sk_bound_dev_if;
+
+ if (msg->msg_controllen) {
+ opt = &opt_space;
+ memset(opt, 0, sizeof(struct ipv6_txoptions));
+ opt->tot_len = sizeof(struct ipv6_txoptions);
+ ipc6.opt = opt;
+
+ err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
+ if (err < 0) {
+ fl6_sock_release(flowlabel);
+ return err;
+ }
+ if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
+ flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
+ if (!flowlabel)
+ return -EINVAL;
+ }
+ if (!(opt->opt_nflen|opt->opt_flen))
+ opt = NULL;
+ }
+ if (!opt) {
+ opt = txopt_get(np);
+ opt_to_free = opt;
+ }
+ if (flowlabel)
+ opt = fl6_merge_options(&opt_space, flowlabel, opt);
+ opt = ipv6_fixup_options(&opt_space, opt);
+
+ fl6.flowi6_proto = proto;
+ rfv.msg = msg;
+ rfv.hlen = 0;
+ err = rawv6_probe_proto_opt(&rfv, &fl6);
+ if (err)
+ goto out;
+
+ if (!ipv6_addr_any(daddr))
+ fl6.daddr = *daddr;
+ else
+ fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
+ if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
+ fl6.saddr = np->saddr;
+
+ final_p = fl6_update_dst(&fl6, opt, &final);
+
+ if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
+ fl6.flowi6_oif = np->mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
+ security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
+
+ if (inet->hdrincl)
+ fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
+
+ if (ipc6.tclass < 0)
+ ipc6.tclass = np->tclass;
+
+ fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
+
+ dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ goto out;
+ }
+ if (ipc6.hlimit < 0)
+ ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
+
+ if (ipc6.dontfrag < 0)
+ ipc6.dontfrag = np->dontfrag;
+
+ if (msg->msg_flags&MSG_CONFIRM)
+ goto do_confirm;
+
+back_from_confirm:
+ if (inet->hdrincl)
+ err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
+ msg->msg_flags, &ipc6.sockc);
+ else {
+ ipc6.opt = opt;
+ lock_sock(sk);
+ err = ip6_append_data(sk, raw6_getfrag, &rfv,
+ len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
+ msg->msg_flags);
+
+ if (err)
+ ip6_flush_pending_frames(sk);
+ else if (!(msg->msg_flags & MSG_MORE))
+ err = rawv6_push_pending_frames(sk, &fl6, rp);
+ release_sock(sk);
+ }
+done:
+ dst_release(dst);
+out:
+ fl6_sock_release(flowlabel);
+ txopt_put(opt_to_free);
+ return err < 0 ? err : len;
+do_confirm:
+ if (msg->msg_flags & MSG_PROBE)
+ dst_confirm_neigh(dst, &fl6.daddr);
+ if (!(msg->msg_flags & MSG_PROBE) || len)
+ goto back_from_confirm;
+ err = 0;
+ goto done;
+}
+
+static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
+ char __user *optval, int optlen)
+{
+ switch (optname) {
+ case ICMPV6_FILTER:
+ if (optlen > sizeof(struct icmp6_filter))
+ optlen = sizeof(struct icmp6_filter);
+ if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
+ return -EFAULT;
+ return 0;
+ default:
+ return -ENOPROTOOPT;
+ }
+
+ return 0;
+}
+
+static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ int len;
+
+ switch (optname) {
+ case ICMPV6_FILTER:
+ if (get_user(len, optlen))
+ return -EFAULT;
+ if (len < 0)
+ return -EINVAL;
+ if (len > sizeof(struct icmp6_filter))
+ len = sizeof(struct icmp6_filter);
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
+ return -EFAULT;
+ return 0;
+ default:
+ return -ENOPROTOOPT;
+ }
+
+ return 0;
+}
+
+
+static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ struct raw6_sock *rp = raw6_sk(sk);
+ int val;
+
+ if (get_user(val, (int __user *)optval))
+ return -EFAULT;
+
+ switch (optname) {
+ case IPV6_HDRINCL:
+ if (sk->sk_type != SOCK_RAW)
+ return -EINVAL;
+ inet_sk(sk)->hdrincl = !!val;
+ return 0;
+ case IPV6_CHECKSUM:
+ if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
+ level == IPPROTO_IPV6) {
+ /*
+ * RFC3542 tells that IPV6_CHECKSUM socket
+ * option in the IPPROTO_IPV6 level is not
+ * allowed on ICMPv6 sockets.
+ * If you want to set it, use IPPROTO_RAW
+ * level IPV6_CHECKSUM socket option
+ * (Linux extension).
+ */
+ return -EINVAL;
+ }
+
+ /* You may get strange result with a positive odd offset;
+ RFC2292bis agrees with me. */
+ if (val > 0 && (val&1))
+ return -EINVAL;
+ if (val < 0) {
+ rp->checksum = 0;
+ } else {
+ rp->checksum = 1;
+ rp->offset = val;
+ }
+
+ return 0;
+
+ default:
+ return -ENOPROTOOPT;
+ }
+}
+
+static int rawv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ switch (level) {
+ case SOL_RAW:
+ break;
+
+ case SOL_ICMPV6:
+ if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+ return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
+ case SOL_IPV6:
+ if (optname == IPV6_CHECKSUM ||
+ optname == IPV6_HDRINCL)
+ break;
+ /* fall through */
+ default:
+ return ipv6_setsockopt(sk, level, optname, optval, optlen);
+ }
+
+ return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ switch (level) {
+ case SOL_RAW:
+ break;
+ case SOL_ICMPV6:
+ if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+ return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
+ case SOL_IPV6:
+ if (optname == IPV6_CHECKSUM ||
+ optname == IPV6_HDRINCL)
+ break;
+ /* fall through */
+ default:
+ return compat_ipv6_setsockopt(sk, level, optname,
+ optval, optlen);
+ }
+ return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
+}
+#endif
+
+static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ struct raw6_sock *rp = raw6_sk(sk);
+ int val, len;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+
+ switch (optname) {
+ case IPV6_HDRINCL:
+ val = inet_sk(sk)->hdrincl;
+ break;
+ case IPV6_CHECKSUM:
+ /*
+ * We allow getsockopt() for IPPROTO_IPV6-level
+ * IPV6_CHECKSUM socket option on ICMPv6 sockets
+ * since RFC3542 is silent about it.
+ */
+ if (rp->checksum == 0)
+ val = -1;
+ else
+ val = rp->offset;
+ break;
+
+ default:
+ return -ENOPROTOOPT;
+ }
+
+ len = min_t(unsigned int, sizeof(int), len);
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &val, len))
+ return -EFAULT;
+ return 0;
+}
+
+static int rawv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ switch (level) {
+ case SOL_RAW:
+ break;
+
+ case SOL_ICMPV6:
+ if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+ return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
+ case SOL_IPV6:
+ if (optname == IPV6_CHECKSUM ||
+ optname == IPV6_HDRINCL)
+ break;
+ /* fall through */
+ default:
+ return ipv6_getsockopt(sk, level, optname, optval, optlen);
+ }
+
+ return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ switch (level) {
+ case SOL_RAW:
+ break;
+ case SOL_ICMPV6:
+ if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+ return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
+ case SOL_IPV6:
+ if (optname == IPV6_CHECKSUM ||
+ optname == IPV6_HDRINCL)
+ break;
+ /* fall through */
+ default:
+ return compat_ipv6_getsockopt(sk, level, optname,
+ optval, optlen);
+ }
+ return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
+}
+#endif
+
+static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case SIOCOUTQ: {
+ int amount = sk_wmem_alloc_get(sk);
+
+ return put_user(amount, (int __user *)arg);
+ }
+ case SIOCINQ: {
+ struct sk_buff *skb;
+ int amount = 0;
+
+ spin_lock_bh(&sk->sk_receive_queue.lock);
+ skb = skb_peek(&sk->sk_receive_queue);
+ if (skb)
+ amount = skb->len;
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+ return put_user(amount, (int __user *)arg);
+ }
+
+ default:
+#ifdef CONFIG_IPV6_MROUTE
+ return ip6mr_ioctl(sk, cmd, (void __user *)arg);
+#else
+ return -ENOIOCTLCMD;
+#endif
+ }
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case SIOCOUTQ:
+ case SIOCINQ:
+ return -ENOIOCTLCMD;
+ default:
+#ifdef CONFIG_IPV6_MROUTE
+ return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
+#else
+ return -ENOIOCTLCMD;
+#endif
+ }
+}
+#endif
+
+static void rawv6_close(struct sock *sk, long timeout)
+{
+ if (inet_sk(sk)->inet_num == IPPROTO_RAW)
+ ip6_ra_control(sk, -1);
+ ip6mr_sk_done(sk);
+ sk_common_release(sk);
+}
+
+static void raw6_destroy(struct sock *sk)
+{
+ lock_sock(sk);
+ ip6_flush_pending_frames(sk);
+ release_sock(sk);
+
+ inet6_destroy_sock(sk);
+}
+
+static int rawv6_init_sk(struct sock *sk)
+{
+ struct raw6_sock *rp = raw6_sk(sk);
+
+ switch (inet_sk(sk)->inet_num) {
+ case IPPROTO_ICMPV6:
+ rp->checksum = 1;
+ rp->offset = 2;
+ break;
+ case IPPROTO_MH:
+ rp->checksum = 1;
+ rp->offset = 4;
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+struct proto rawv6_prot = {
+ .name = "RAWv6",
+ .owner = THIS_MODULE,
+ .close = rawv6_close,
+ .destroy = raw6_destroy,
+ .connect = ip6_datagram_connect_v6_only,
+ .disconnect = __udp_disconnect,
+ .ioctl = rawv6_ioctl,
+ .init = rawv6_init_sk,
+ .setsockopt = rawv6_setsockopt,
+ .getsockopt = rawv6_getsockopt,
+ .sendmsg = rawv6_sendmsg,
+ .recvmsg = rawv6_recvmsg,
+ .bind = rawv6_bind,
+ .backlog_rcv = rawv6_rcv_skb,
+ .hash = raw_hash_sk,
+ .unhash = raw_unhash_sk,
+ .obj_size = sizeof(struct raw6_sock),
+ .useroffset = offsetof(struct raw6_sock, filter),
+ .usersize = sizeof_field(struct raw6_sock, filter),
+ .h.raw_hash = &raw_v6_hashinfo,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_rawv6_setsockopt,
+ .compat_getsockopt = compat_rawv6_getsockopt,
+ .compat_ioctl = compat_rawv6_ioctl,
+#endif
+ .diag_destroy = raw_abort,
+};
+
+#ifdef CONFIG_PROC_FS
+static int raw6_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
+ } else {
+ struct sock *sp = v;
+ __u16 srcp = inet_sk(sp)->inet_num;
+ ip6_dgram_sock_seq_show(seq, v, srcp, 0,
+ raw_seq_private(seq)->bucket);
+ }
+ return 0;
+}
+
+static const struct seq_operations raw6_seq_ops = {
+ .start = raw_seq_start,
+ .next = raw_seq_next,
+ .stop = raw_seq_stop,
+ .show = raw6_seq_show,
+};
+
+static int __net_init raw6_init_net(struct net *net)
+{
+ if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
+ sizeof(struct raw_iter_state), &raw_v6_hashinfo))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void __net_exit raw6_exit_net(struct net *net)
+{
+ remove_proc_entry("raw6", net->proc_net);
+}
+
+static struct pernet_operations raw6_net_ops = {
+ .init = raw6_init_net,
+ .exit = raw6_exit_net,
+};
+
+int __init raw6_proc_init(void)
+{
+ return register_pernet_subsys(&raw6_net_ops);
+}
+
+void raw6_proc_exit(void)
+{
+ unregister_pernet_subsys(&raw6_net_ops);
+}
+#endif /* CONFIG_PROC_FS */
+
+/* Same as inet6_dgram_ops, sans udp_poll. */
+const struct proto_ops inet6_sockraw_ops = {
+ .family = PF_INET6,
+ .owner = THIS_MODULE,
+ .release = inet6_release,
+ .bind = inet6_bind,
+ .connect = inet_dgram_connect, /* ok */
+ .socketpair = sock_no_socketpair, /* a do nothing */
+ .accept = sock_no_accept, /* a do nothing */
+ .getname = inet6_getname,
+ .poll = datagram_poll, /* ok */
+ .ioctl = inet6_ioctl, /* must change */
+ .listen = sock_no_listen, /* ok */
+ .shutdown = inet_shutdown, /* ok */
+ .setsockopt = sock_common_setsockopt, /* ok */
+ .getsockopt = sock_common_getsockopt, /* ok */
+ .sendmsg = inet_sendmsg, /* ok */
+ .recvmsg = sock_common_recvmsg, /* ok */
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+};
+
+static struct inet_protosw rawv6_protosw = {
+ .type = SOCK_RAW,
+ .protocol = IPPROTO_IP, /* wild card */
+ .prot = &rawv6_prot,
+ .ops = &inet6_sockraw_ops,
+ .flags = INET_PROTOSW_REUSE,
+};
+
+int __init rawv6_init(void)
+{
+ return inet6_register_protosw(&rawv6_protosw);
+}
+
+void rawv6_exit(void)
+{
+ inet6_unregister_protosw(&rawv6_protosw);
+}
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
new file mode 100644
index 0000000..d3fd2d7
--- /dev/null
+++ b/net/ipv6/reassembly.c
@@ -0,0 +1,707 @@
+/*
+ * IPv6 fragment reassembly
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Based on: net/ipv4/ip_fragment.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * Fixes:
+ * Andi Kleen Make it work with multiple hosts.
+ * More RFC compliance.
+ *
+ * Horst von Brand Add missing #include <linux/string.h>
+ * Alexey Kuznetsov SMP races, threading, cleanup.
+ * Patrick McHardy LRU queue of frag heads for evictor.
+ * Mitsuru KANDA @USAGI Register inet6_protocol{}.
+ * David Stevens and
+ * YOSHIFUJI,H. @USAGI Always remove fragment header to
+ * calculate ICV correctly.
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/jiffies.h>
+#include <linux/net.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/random.h>
+#include <linux/jhash.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/rawv6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/ipv6_frag.h>
+#include <net/inet_ecn.h>
+
+static const char ip6_frag_cache_name[] = "ip6-frags";
+
+static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h)
+{
+ return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK);
+}
+
+static struct inet_frags ip6_frags;
+
+static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
+ struct net_device *dev);
+
+static void ip6_frag_expire(struct timer_list *t)
+{
+ struct inet_frag_queue *frag = from_timer(frag, t, timer);
+ struct frag_queue *fq;
+ struct net *net;
+
+ fq = container_of(frag, struct frag_queue, q);
+ net = container_of(fq->q.net, struct net, ipv6.frags);
+
+ ip6frag_expire_frag_queue(net, fq);
+}
+
+static struct frag_queue *
+fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif)
+{
+ struct frag_v6_compare_key key = {
+ .id = id,
+ .saddr = hdr->saddr,
+ .daddr = hdr->daddr,
+ .user = IP6_DEFRAG_LOCAL_DELIVER,
+ .iif = iif,
+ };
+ struct inet_frag_queue *q;
+
+ if (!(ipv6_addr_type(&hdr->daddr) & (IPV6_ADDR_MULTICAST |
+ IPV6_ADDR_LINKLOCAL)))
+ key.iif = 0;
+
+ q = inet_frag_find(&net->ipv6.frags, &key);
+ if (!q)
+ return NULL;
+
+ return container_of(q, struct frag_queue, q);
+}
+
+static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
+ struct frag_hdr *fhdr, int nhoff,
+ u32 *prob_offset)
+{
+ struct sk_buff *prev, *next;
+ struct net_device *dev;
+ int offset, end, fragsize;
+ struct net *net = dev_net(skb_dst(skb)->dev);
+ u8 ecn;
+
+ if (fq->q.flags & INET_FRAG_COMPLETE)
+ goto err;
+
+ offset = ntohs(fhdr->frag_off) & ~0x7;
+ end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
+ ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
+
+ if ((unsigned int)end > IPV6_MAXPLEN) {
+ *prob_offset = (u8 *)&fhdr->frag_off - skb_network_header(skb);
+ return -1;
+ }
+
+ ecn = ip6_frag_ecn(ipv6_hdr(skb));
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ const unsigned char *nh = skb_network_header(skb);
+ skb->csum = csum_sub(skb->csum,
+ csum_partial(nh, (u8 *)(fhdr + 1) - nh,
+ 0));
+ }
+
+ /* Is this the final fragment? */
+ if (!(fhdr->frag_off & htons(IP6_MF))) {
+ /* If we already have some bits beyond end
+ * or have different end, the segment is corrupted.
+ */
+ if (end < fq->q.len ||
+ ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
+ goto err;
+ fq->q.flags |= INET_FRAG_LAST_IN;
+ fq->q.len = end;
+ } else {
+ /* Check if the fragment is rounded to 8 bytes.
+ * Required by the RFC.
+ */
+ if (end & 0x7) {
+ /* RFC2460 says always send parameter problem in
+ * this case. -DaveM
+ */
+ *prob_offset = offsetof(struct ipv6hdr, payload_len);
+ return -1;
+ }
+ if (end > fq->q.len) {
+ /* Some bits beyond end -> corruption. */
+ if (fq->q.flags & INET_FRAG_LAST_IN)
+ goto err;
+ fq->q.len = end;
+ }
+ }
+
+ if (end == offset)
+ goto err;
+
+ /* Point into the IP datagram 'data' part. */
+ if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
+ goto err;
+
+ if (pskb_trim_rcsum(skb, end - offset))
+ goto err;
+
+ /* Find out which fragments are in front and at the back of us
+ * in the chain of fragments so far. We must know where to put
+ * this fragment, right?
+ */
+ prev = fq->q.fragments_tail;
+ if (!prev || prev->ip_defrag_offset < offset) {
+ next = NULL;
+ goto found;
+ }
+ prev = NULL;
+ for (next = fq->q.fragments; next != NULL; next = next->next) {
+ if (next->ip_defrag_offset >= offset)
+ break; /* bingo! */
+ prev = next;
+ }
+
+found:
+ /* RFC5722, Section 4, amended by Errata ID : 3089
+ * When reassembling an IPv6 datagram, if
+ * one or more its constituent fragments is determined to be an
+ * overlapping fragment, the entire datagram (and any constituent
+ * fragments) MUST be silently discarded.
+ */
+
+ /* Check for overlap with preceding fragment. */
+ if (prev &&
+ (prev->ip_defrag_offset + prev->len) > offset)
+ goto discard_fq;
+
+ /* Look for overlap with succeeding segment. */
+ if (next && next->ip_defrag_offset < end)
+ goto discard_fq;
+
+ /* Note : skb->ip_defrag_offset and skb->dev share the same location */
+ dev = skb->dev;
+ if (dev)
+ fq->iif = dev->ifindex;
+ /* Makes sure compiler wont do silly aliasing games */
+ barrier();
+ skb->ip_defrag_offset = offset;
+
+ /* Insert this fragment in the chain of fragments. */
+ skb->next = next;
+ if (!next)
+ fq->q.fragments_tail = skb;
+ if (prev)
+ prev->next = skb;
+ else
+ fq->q.fragments = skb;
+
+ fq->q.stamp = skb->tstamp;
+ fq->q.meat += skb->len;
+ fq->ecn |= ecn;
+ add_frag_mem_limit(fq->q.net, skb->truesize);
+
+ fragsize = -skb_network_offset(skb) + skb->len;
+ if (fragsize > fq->q.max_size)
+ fq->q.max_size = fragsize;
+
+ /* The first fragment.
+ * nhoffset is obtained from the first fragment, of course.
+ */
+ if (offset == 0) {
+ fq->nhoffset = nhoff;
+ fq->q.flags |= INET_FRAG_FIRST_IN;
+ }
+
+ if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
+ fq->q.meat == fq->q.len) {
+ int res;
+ unsigned long orefdst = skb->_skb_refdst;
+
+ skb->_skb_refdst = 0UL;
+ res = ip6_frag_reasm(fq, prev, dev);
+ skb->_skb_refdst = orefdst;
+ return res;
+ }
+
+ skb_dst_drop(skb);
+ return -1;
+
+discard_fq:
+ inet_frag_kill(&fq->q);
+err:
+ __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_REASMFAILS);
+ kfree_skb(skb);
+ return -1;
+}
+
+/*
+ * Check if this packet is complete.
+ * Returns NULL on failure by any reason, and pointer
+ * to current nexthdr field in reassembled frame.
+ *
+ * It is called with locked fq, and caller must check that
+ * queue is eligible for reassembly i.e. it is not COMPLETE,
+ * the last and the first frames arrived and all the bits are here.
+ */
+static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
+ struct net_device *dev)
+{
+ struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
+ struct sk_buff *fp, *head = fq->q.fragments;
+ int payload_len, delta;
+ unsigned int nhoff;
+ int sum_truesize;
+ u8 ecn;
+
+ inet_frag_kill(&fq->q);
+
+ ecn = ip_frag_ecn_table[fq->ecn];
+ if (unlikely(ecn == 0xff))
+ goto out_fail;
+
+ /* Make the one we just received the head. */
+ if (prev) {
+ head = prev->next;
+ fp = skb_clone(head, GFP_ATOMIC);
+
+ if (!fp)
+ goto out_oom;
+
+ fp->next = head->next;
+ if (!fp->next)
+ fq->q.fragments_tail = fp;
+ prev->next = fp;
+
+ skb_morph(head, fq->q.fragments);
+ head->next = fq->q.fragments->next;
+
+ consume_skb(fq->q.fragments);
+ fq->q.fragments = head;
+ }
+
+ WARN_ON(head == NULL);
+ WARN_ON(head->ip_defrag_offset != 0);
+
+ /* Unfragmented part is taken from the first segment. */
+ payload_len = ((head->data - skb_network_header(head)) -
+ sizeof(struct ipv6hdr) + fq->q.len -
+ sizeof(struct frag_hdr));
+ if (payload_len > IPV6_MAXPLEN)
+ goto out_oversize;
+
+ delta = - head->truesize;
+
+ /* Head of list must not be cloned. */
+ if (skb_unclone(head, GFP_ATOMIC))
+ goto out_oom;
+
+ delta += head->truesize;
+ if (delta)
+ add_frag_mem_limit(fq->q.net, delta);
+
+ /* If the first fragment is fragmented itself, we split
+ * it to two chunks: the first with data and paged part
+ * and the second, holding only fragments. */
+ if (skb_has_frag_list(head)) {
+ struct sk_buff *clone;
+ int i, plen = 0;
+
+ clone = alloc_skb(0, GFP_ATOMIC);
+ if (!clone)
+ goto out_oom;
+ clone->next = head->next;
+ head->next = clone;
+ skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
+ skb_frag_list_init(head);
+ for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
+ plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
+ clone->len = clone->data_len = head->data_len - plen;
+ head->data_len -= clone->len;
+ head->len -= clone->len;
+ clone->csum = 0;
+ clone->ip_summed = head->ip_summed;
+ add_frag_mem_limit(fq->q.net, clone->truesize);
+ }
+
+ /* We have to remove fragment header from datagram and to relocate
+ * header in order to calculate ICV correctly. */
+ nhoff = fq->nhoffset;
+ skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
+ memmove(head->head + sizeof(struct frag_hdr), head->head,
+ (head->data - head->head) - sizeof(struct frag_hdr));
+ if (skb_mac_header_was_set(head))
+ head->mac_header += sizeof(struct frag_hdr);
+ head->network_header += sizeof(struct frag_hdr);
+
+ skb_reset_transport_header(head);
+ skb_push(head, head->data - skb_network_header(head));
+
+ sum_truesize = head->truesize;
+ for (fp = head->next; fp;) {
+ bool headstolen;
+ int delta;
+ struct sk_buff *next = fp->next;
+
+ sum_truesize += fp->truesize;
+ if (head->ip_summed != fp->ip_summed)
+ head->ip_summed = CHECKSUM_NONE;
+ else if (head->ip_summed == CHECKSUM_COMPLETE)
+ head->csum = csum_add(head->csum, fp->csum);
+
+ if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
+ kfree_skb_partial(fp, headstolen);
+ } else {
+ if (!skb_shinfo(head)->frag_list)
+ skb_shinfo(head)->frag_list = fp;
+ head->data_len += fp->len;
+ head->len += fp->len;
+ head->truesize += fp->truesize;
+ }
+ fp = next;
+ }
+ sub_frag_mem_limit(fq->q.net, sum_truesize);
+
+ head->next = NULL;
+ head->dev = dev;
+ head->tstamp = fq->q.stamp;
+ ipv6_hdr(head)->payload_len = htons(payload_len);
+ ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn);
+ IP6CB(head)->nhoff = nhoff;
+ IP6CB(head)->flags |= IP6SKB_FRAGMENTED;
+ IP6CB(head)->frag_max_size = fq->q.max_size;
+
+ /* Yes, and fold redundant checksum back. 8) */
+ skb_postpush_rcsum(head, skb_network_header(head),
+ skb_network_header_len(head));
+
+ rcu_read_lock();
+ __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
+ rcu_read_unlock();
+ fq->q.fragments = NULL;
+ fq->q.rb_fragments = RB_ROOT;
+ fq->q.fragments_tail = NULL;
+ return 1;
+
+out_oversize:
+ net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len);
+ goto out_fail;
+out_oom:
+ net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n");
+out_fail:
+ rcu_read_lock();
+ __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
+ rcu_read_unlock();
+ return -1;
+}
+
+static int ipv6_frag_rcv(struct sk_buff *skb)
+{
+ struct frag_hdr *fhdr;
+ struct frag_queue *fq;
+ const struct ipv6hdr *hdr = ipv6_hdr(skb);
+ struct net *net = dev_net(skb_dst(skb)->dev);
+ int iif;
+
+ if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
+ goto fail_hdr;
+
+ __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
+
+ /* Jumbo payload inhibits frag. header */
+ if (hdr->payload_len == 0)
+ goto fail_hdr;
+
+ if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
+ sizeof(struct frag_hdr))))
+ goto fail_hdr;
+
+ hdr = ipv6_hdr(skb);
+ fhdr = (struct frag_hdr *)skb_transport_header(skb);
+
+ if (!(fhdr->frag_off & htons(0xFFF9))) {
+ /* It is not a fragmented frame */
+ skb->transport_header += sizeof(struct frag_hdr);
+ __IP6_INC_STATS(net,
+ ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
+
+ IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
+ IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
+ return 1;
+ }
+
+ if (skb->len - skb_network_offset(skb) < IPV6_MIN_MTU &&
+ fhdr->frag_off & htons(IP6_MF))
+ goto fail_hdr;
+
+ iif = skb->dev ? skb->dev->ifindex : 0;
+ fq = fq_find(net, fhdr->identification, hdr, iif);
+ if (fq) {
+ u32 prob_offset = 0;
+ int ret;
+
+ spin_lock(&fq->q.lock);
+
+ fq->iif = iif;
+ ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff,
+ &prob_offset);
+
+ spin_unlock(&fq->q.lock);
+ inet_frag_put(&fq->q);
+ if (prob_offset) {
+ __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
+ IPSTATS_MIB_INHDRERRORS);
+ icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, prob_offset);
+ }
+ return ret;
+ }
+
+ __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
+ kfree_skb(skb);
+ return -1;
+
+fail_hdr:
+ __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
+ IPSTATS_MIB_INHDRERRORS);
+ icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
+ return -1;
+}
+
+static const struct inet6_protocol frag_protocol = {
+ .handler = ipv6_frag_rcv,
+ .flags = INET6_PROTO_NOPOLICY,
+};
+
+#ifdef CONFIG_SYSCTL
+
+static struct ctl_table ip6_frags_ns_ctl_table[] = {
+ {
+ .procname = "ip6frag_high_thresh",
+ .data = &init_net.ipv6.frags.high_thresh,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ .extra1 = &init_net.ipv6.frags.low_thresh
+ },
+ {
+ .procname = "ip6frag_low_thresh",
+ .data = &init_net.ipv6.frags.low_thresh,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ .extra2 = &init_net.ipv6.frags.high_thresh
+ },
+ {
+ .procname = "ip6frag_time",
+ .data = &init_net.ipv6.frags.timeout,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ { }
+};
+
+/* secret interval has been deprecated */
+static int ip6_frags_secret_interval_unused;
+static struct ctl_table ip6_frags_ctl_table[] = {
+ {
+ .procname = "ip6frag_secret_interval",
+ .data = &ip6_frags_secret_interval_unused,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ { }
+};
+
+static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
+{
+ struct ctl_table *table;
+ struct ctl_table_header *hdr;
+
+ table = ip6_frags_ns_ctl_table;
+ if (!net_eq(net, &init_net)) {
+ table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
+ if (!table)
+ goto err_alloc;
+
+ table[0].data = &net->ipv6.frags.high_thresh;
+ table[0].extra1 = &net->ipv6.frags.low_thresh;
+ table[0].extra2 = &init_net.ipv6.frags.high_thresh;
+ table[1].data = &net->ipv6.frags.low_thresh;
+ table[1].extra2 = &net->ipv6.frags.high_thresh;
+ table[2].data = &net->ipv6.frags.timeout;
+ }
+
+ hdr = register_net_sysctl(net, "net/ipv6", table);
+ if (!hdr)
+ goto err_reg;
+
+ net->ipv6.sysctl.frags_hdr = hdr;
+ return 0;
+
+err_reg:
+ if (!net_eq(net, &init_net))
+ kfree(table);
+err_alloc:
+ return -ENOMEM;
+}
+
+static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
+{
+ struct ctl_table *table;
+
+ table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
+ unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
+ if (!net_eq(net, &init_net))
+ kfree(table);
+}
+
+static struct ctl_table_header *ip6_ctl_header;
+
+static int ip6_frags_sysctl_register(void)
+{
+ ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6",
+ ip6_frags_ctl_table);
+ return ip6_ctl_header == NULL ? -ENOMEM : 0;
+}
+
+static void ip6_frags_sysctl_unregister(void)
+{
+ unregister_net_sysctl_table(ip6_ctl_header);
+}
+#else
+static int ip6_frags_ns_sysctl_register(struct net *net)
+{
+ return 0;
+}
+
+static void ip6_frags_ns_sysctl_unregister(struct net *net)
+{
+}
+
+static int ip6_frags_sysctl_register(void)
+{
+ return 0;
+}
+
+static void ip6_frags_sysctl_unregister(void)
+{
+}
+#endif
+
+static int __net_init ipv6_frags_init_net(struct net *net)
+{
+ int res;
+
+ net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
+ net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
+ net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
+ net->ipv6.frags.f = &ip6_frags;
+
+ res = inet_frags_init_net(&net->ipv6.frags);
+ if (res < 0)
+ return res;
+
+ res = ip6_frags_ns_sysctl_register(net);
+ if (res < 0)
+ inet_frags_exit_net(&net->ipv6.frags);
+ return res;
+}
+
+static void __net_exit ipv6_frags_exit_net(struct net *net)
+{
+ ip6_frags_ns_sysctl_unregister(net);
+ inet_frags_exit_net(&net->ipv6.frags);
+}
+
+static struct pernet_operations ip6_frags_ops = {
+ .init = ipv6_frags_init_net,
+ .exit = ipv6_frags_exit_net,
+};
+
+static const struct rhashtable_params ip6_rhash_params = {
+ .head_offset = offsetof(struct inet_frag_queue, node),
+ .hashfn = ip6frag_key_hashfn,
+ .obj_hashfn = ip6frag_obj_hashfn,
+ .obj_cmpfn = ip6frag_obj_cmpfn,
+ .automatic_shrinking = true,
+};
+
+int __init ipv6_frag_init(void)
+{
+ int ret;
+
+ ip6_frags.constructor = ip6frag_init;
+ ip6_frags.destructor = NULL;
+ ip6_frags.qsize = sizeof(struct frag_queue);
+ ip6_frags.frag_expire = ip6_frag_expire;
+ ip6_frags.frags_cache_name = ip6_frag_cache_name;
+ ip6_frags.rhash_params = ip6_rhash_params;
+ ret = inet_frags_init(&ip6_frags);
+ if (ret)
+ goto out;
+
+ ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
+ if (ret)
+ goto err_protocol;
+
+ ret = ip6_frags_sysctl_register();
+ if (ret)
+ goto err_sysctl;
+
+ ret = register_pernet_subsys(&ip6_frags_ops);
+ if (ret)
+ goto err_pernet;
+
+out:
+ return ret;
+
+err_pernet:
+ ip6_frags_sysctl_unregister();
+err_sysctl:
+ inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
+err_protocol:
+ inet_frags_fini(&ip6_frags);
+ goto out;
+}
+
+void ipv6_frag_exit(void)
+{
+ inet_frags_fini(&ip6_frags);
+ ip6_frags_sysctl_unregister();
+ unregister_pernet_subsys(&ip6_frags_ops);
+ inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
+}
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
new file mode 100644
index 0000000..a33681d
--- /dev/null
+++ b/net/ipv6/route.c
@@ -0,0 +1,5459 @@
+/*
+ * Linux INET6 implementation
+ * FIB front-end.
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/* Changes:
+ *
+ * YOSHIFUJI Hideaki @USAGI
+ * reworked default router selection.
+ * - respect outgoing interface
+ * - select from (probably) reachable routers (i.e.
+ * routers in REACHABLE, STALE, DELAY or PROBE states).
+ * - always select the same router if it is (probably)
+ * reachable. otherwise, round-robin the list.
+ * Ville Nuorvala
+ * Fixed routing subtrees.
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/types.h>
+#include <linux/times.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/route.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/mroute6.h>
+#include <linux/init.h>
+#include <linux/if_arp.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/nsproxy.h>
+#include <linux/slab.h>
+#include <linux/jhash.h>
+#include <net/net_namespace.h>
+#include <net/snmp.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/tcp.h>
+#include <linux/rtnetlink.h>
+#include <net/dst.h>
+#include <net/dst_metadata.h>
+#include <net/xfrm.h>
+#include <net/netevent.h>
+#include <net/netlink.h>
+#include <net/nexthop.h>
+#include <net/lwtunnel.h>
+#include <net/ip_tunnels.h>
+#include <net/l3mdev.h>
+#include <net/ip.h>
+#include <linux/uaccess.h>
+
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+
+static int ip6_rt_type_to_error(u8 fib6_type);
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/fib6.h>
+EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
+#undef CREATE_TRACE_POINTS
+
+enum rt6_nud_state {
+ RT6_NUD_FAIL_HARD = -3,
+ RT6_NUD_FAIL_PROBE = -2,
+ RT6_NUD_FAIL_DO_RR = -1,
+ RT6_NUD_SUCCEED = 1
+};
+
+static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
+static unsigned int ip6_default_advmss(const struct dst_entry *dst);
+static unsigned int ip6_mtu(const struct dst_entry *dst);
+static struct dst_entry *ip6_negative_advice(struct dst_entry *);
+static void ip6_dst_destroy(struct dst_entry *);
+static void ip6_dst_ifdown(struct dst_entry *,
+ struct net_device *dev, int how);
+static int ip6_dst_gc(struct dst_ops *ops);
+
+static int ip6_pkt_discard(struct sk_buff *skb);
+static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
+static int ip6_pkt_prohibit(struct sk_buff *skb);
+static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
+static void ip6_link_failure(struct sk_buff *skb);
+static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb, u32 mtu);
+static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb);
+static int rt6_score_route(struct fib6_info *rt, int oif, int strict);
+static size_t rt6_nlmsg_size(struct fib6_info *rt);
+static int rt6_fill_node(struct net *net, struct sk_buff *skb,
+ struct fib6_info *rt, struct dst_entry *dst,
+ struct in6_addr *dest, struct in6_addr *src,
+ int iif, int type, u32 portid, u32 seq,
+ unsigned int flags);
+static struct rt6_info *rt6_find_cached_rt(struct fib6_info *rt,
+ struct in6_addr *daddr,
+ struct in6_addr *saddr);
+
+#ifdef CONFIG_IPV6_ROUTE_INFO
+static struct fib6_info *rt6_add_route_info(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ const struct in6_addr *gwaddr,
+ struct net_device *dev,
+ unsigned int pref);
+static struct fib6_info *rt6_get_route_info(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ const struct in6_addr *gwaddr,
+ struct net_device *dev);
+#endif
+
+struct uncached_list {
+ spinlock_t lock;
+ struct list_head head;
+};
+
+static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
+
+void rt6_uncached_list_add(struct rt6_info *rt)
+{
+ struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
+
+ rt->rt6i_uncached_list = ul;
+
+ spin_lock_bh(&ul->lock);
+ list_add_tail(&rt->rt6i_uncached, &ul->head);
+ spin_unlock_bh(&ul->lock);
+}
+
+void rt6_uncached_list_del(struct rt6_info *rt)
+{
+ if (!list_empty(&rt->rt6i_uncached)) {
+ struct uncached_list *ul = rt->rt6i_uncached_list;
+ struct net *net = dev_net(rt->dst.dev);
+
+ spin_lock_bh(&ul->lock);
+ list_del(&rt->rt6i_uncached);
+ atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
+ spin_unlock_bh(&ul->lock);
+ }
+}
+
+static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
+{
+ struct net_device *loopback_dev = net->loopback_dev;
+ int cpu;
+
+ if (dev == loopback_dev)
+ return;
+
+ for_each_possible_cpu(cpu) {
+ struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
+ struct rt6_info *rt;
+
+ spin_lock_bh(&ul->lock);
+ list_for_each_entry(rt, &ul->head, rt6i_uncached) {
+ struct inet6_dev *rt_idev = rt->rt6i_idev;
+ struct net_device *rt_dev = rt->dst.dev;
+
+ if (rt_idev->dev == dev) {
+ rt->rt6i_idev = in6_dev_get(loopback_dev);
+ in6_dev_put(rt_idev);
+ }
+
+ if (rt_dev == dev) {
+ rt->dst.dev = loopback_dev;
+ dev_hold(rt->dst.dev);
+ dev_put(rt_dev);
+ }
+ }
+ spin_unlock_bh(&ul->lock);
+ }
+}
+
+static inline const void *choose_neigh_daddr(const struct in6_addr *p,
+ struct sk_buff *skb,
+ const void *daddr)
+{
+ if (!ipv6_addr_any(p))
+ return (const void *) p;
+ else if (skb)
+ return &ipv6_hdr(skb)->daddr;
+ return daddr;
+}
+
+struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
+ struct net_device *dev,
+ struct sk_buff *skb,
+ const void *daddr)
+{
+ struct neighbour *n;
+
+ daddr = choose_neigh_daddr(gw, skb, daddr);
+ n = __ipv6_neigh_lookup(dev, daddr);
+ if (n)
+ return n;
+ return neigh_create(&nd_tbl, daddr, dev);
+}
+
+static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
+ struct sk_buff *skb,
+ const void *daddr)
+{
+ const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
+
+ return ip6_neigh_lookup(&rt->rt6i_gateway, dst->dev, skb, daddr);
+}
+
+static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
+{
+ struct net_device *dev = dst->dev;
+ struct rt6_info *rt = (struct rt6_info *)dst;
+
+ daddr = choose_neigh_daddr(&rt->rt6i_gateway, NULL, daddr);
+ if (!daddr)
+ return;
+ if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
+ return;
+ if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
+ return;
+ __ipv6_confirm_neigh(dev, daddr);
+}
+
+static struct dst_ops ip6_dst_ops_template = {
+ .family = AF_INET6,
+ .gc = ip6_dst_gc,
+ .gc_thresh = 1024,
+ .check = ip6_dst_check,
+ .default_advmss = ip6_default_advmss,
+ .mtu = ip6_mtu,
+ .cow_metrics = dst_cow_metrics_generic,
+ .destroy = ip6_dst_destroy,
+ .ifdown = ip6_dst_ifdown,
+ .negative_advice = ip6_negative_advice,
+ .link_failure = ip6_link_failure,
+ .update_pmtu = ip6_rt_update_pmtu,
+ .redirect = rt6_do_redirect,
+ .local_out = __ip6_local_out,
+ .neigh_lookup = ip6_dst_neigh_lookup,
+ .confirm_neigh = ip6_confirm_neigh,
+};
+
+static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
+{
+ unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
+
+ return mtu ? : dst->dev->mtu;
+}
+
+static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb, u32 mtu)
+{
+}
+
+static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb)
+{
+}
+
+static struct dst_ops ip6_dst_blackhole_ops = {
+ .family = AF_INET6,
+ .destroy = ip6_dst_destroy,
+ .check = ip6_dst_check,
+ .mtu = ip6_blackhole_mtu,
+ .default_advmss = ip6_default_advmss,
+ .update_pmtu = ip6_rt_blackhole_update_pmtu,
+ .redirect = ip6_rt_blackhole_redirect,
+ .cow_metrics = dst_cow_metrics_generic,
+ .neigh_lookup = ip6_dst_neigh_lookup,
+};
+
+static const u32 ip6_template_metrics[RTAX_MAX] = {
+ [RTAX_HOPLIMIT - 1] = 0,
+};
+
+static const struct fib6_info fib6_null_entry_template = {
+ .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
+ .fib6_protocol = RTPROT_KERNEL,
+ .fib6_metric = ~(u32)0,
+ .fib6_ref = ATOMIC_INIT(1),
+ .fib6_type = RTN_UNREACHABLE,
+ .fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
+};
+
+static const struct rt6_info ip6_null_entry_template = {
+ .dst = {
+ .__refcnt = ATOMIC_INIT(1),
+ .__use = 1,
+ .obsolete = DST_OBSOLETE_FORCE_CHK,
+ .error = -ENETUNREACH,
+ .input = ip6_pkt_discard,
+ .output = ip6_pkt_discard_out,
+ },
+ .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
+};
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+
+static const struct rt6_info ip6_prohibit_entry_template = {
+ .dst = {
+ .__refcnt = ATOMIC_INIT(1),
+ .__use = 1,
+ .obsolete = DST_OBSOLETE_FORCE_CHK,
+ .error = -EACCES,
+ .input = ip6_pkt_prohibit,
+ .output = ip6_pkt_prohibit_out,
+ },
+ .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
+};
+
+static const struct rt6_info ip6_blk_hole_entry_template = {
+ .dst = {
+ .__refcnt = ATOMIC_INIT(1),
+ .__use = 1,
+ .obsolete = DST_OBSOLETE_FORCE_CHK,
+ .error = -EINVAL,
+ .input = dst_discard,
+ .output = dst_discard_out,
+ },
+ .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
+};
+
+#endif
+
+static void rt6_info_init(struct rt6_info *rt)
+{
+ struct dst_entry *dst = &rt->dst;
+
+ memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
+ INIT_LIST_HEAD(&rt->rt6i_uncached);
+}
+
+/* allocate dst with ip6_dst_ops */
+struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
+ int flags)
+{
+ struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
+ 1, DST_OBSOLETE_FORCE_CHK, flags);
+
+ if (rt) {
+ rt6_info_init(rt);
+ atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
+ }
+
+ return rt;
+}
+EXPORT_SYMBOL(ip6_dst_alloc);
+
+static void ip6_dst_destroy(struct dst_entry *dst)
+{
+ struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
+ struct rt6_info *rt = (struct rt6_info *)dst;
+ struct fib6_info *from;
+ struct inet6_dev *idev;
+
+ if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
+ kfree(p);
+
+ rt6_uncached_list_del(rt);
+
+ idev = rt->rt6i_idev;
+ if (idev) {
+ rt->rt6i_idev = NULL;
+ in6_dev_put(idev);
+ }
+
+ rcu_read_lock();
+ from = rcu_dereference(rt->from);
+ rcu_assign_pointer(rt->from, NULL);
+ fib6_info_release(from);
+ rcu_read_unlock();
+}
+
+static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
+ int how)
+{
+ struct rt6_info *rt = (struct rt6_info *)dst;
+ struct inet6_dev *idev = rt->rt6i_idev;
+ struct net_device *loopback_dev =
+ dev_net(dev)->loopback_dev;
+
+ if (idev && idev->dev != loopback_dev) {
+ struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev);
+ if (loopback_idev) {
+ rt->rt6i_idev = loopback_idev;
+ in6_dev_put(idev);
+ }
+ }
+}
+
+static bool __rt6_check_expired(const struct rt6_info *rt)
+{
+ if (rt->rt6i_flags & RTF_EXPIRES)
+ return time_after(jiffies, rt->dst.expires);
+ else
+ return false;
+}
+
+static bool rt6_check_expired(const struct rt6_info *rt)
+{
+ struct fib6_info *from;
+
+ from = rcu_dereference(rt->from);
+
+ if (rt->rt6i_flags & RTF_EXPIRES) {
+ if (time_after(jiffies, rt->dst.expires))
+ return true;
+ } else if (from) {
+ return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
+ fib6_check_expired(from);
+ }
+ return false;
+}
+
+struct fib6_info *fib6_multipath_select(const struct net *net,
+ struct fib6_info *match,
+ struct flowi6 *fl6, int oif,
+ const struct sk_buff *skb,
+ int strict)
+{
+ struct fib6_info *sibling, *next_sibling;
+
+ /* We might have already computed the hash for ICMPv6 errors. In such
+ * case it will always be non-zero. Otherwise now is the time to do it.
+ */
+ if (!fl6->mp_hash)
+ fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
+
+ if (fl6->mp_hash <= atomic_read(&match->fib6_nh.nh_upper_bound))
+ return match;
+
+ list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
+ fib6_siblings) {
+ int nh_upper_bound;
+
+ nh_upper_bound = atomic_read(&sibling->fib6_nh.nh_upper_bound);
+ if (fl6->mp_hash > nh_upper_bound)
+ continue;
+ if (rt6_score_route(sibling, oif, strict) < 0)
+ break;
+ match = sibling;
+ break;
+ }
+
+ return match;
+}
+
+/*
+ * Route lookup. rcu_read_lock() should be held.
+ */
+
+static inline struct fib6_info *rt6_device_match(struct net *net,
+ struct fib6_info *rt,
+ const struct in6_addr *saddr,
+ int oif,
+ int flags)
+{
+ struct fib6_info *sprt;
+
+ if (!oif && ipv6_addr_any(saddr) &&
+ !(rt->fib6_nh.nh_flags & RTNH_F_DEAD))
+ return rt;
+
+ for (sprt = rt; sprt; sprt = rcu_dereference(sprt->fib6_next)) {
+ const struct net_device *dev = sprt->fib6_nh.nh_dev;
+
+ if (sprt->fib6_nh.nh_flags & RTNH_F_DEAD)
+ continue;
+
+ if (oif) {
+ if (dev->ifindex == oif)
+ return sprt;
+ } else {
+ if (ipv6_chk_addr(net, saddr, dev,
+ flags & RT6_LOOKUP_F_IFACE))
+ return sprt;
+ }
+ }
+
+ if (oif && flags & RT6_LOOKUP_F_IFACE)
+ return net->ipv6.fib6_null_entry;
+
+ return rt->fib6_nh.nh_flags & RTNH_F_DEAD ? net->ipv6.fib6_null_entry : rt;
+}
+
+#ifdef CONFIG_IPV6_ROUTER_PREF
+struct __rt6_probe_work {
+ struct work_struct work;
+ struct in6_addr target;
+ struct net_device *dev;
+};
+
+static void rt6_probe_deferred(struct work_struct *w)
+{
+ struct in6_addr mcaddr;
+ struct __rt6_probe_work *work =
+ container_of(w, struct __rt6_probe_work, work);
+
+ addrconf_addr_solict_mult(&work->target, &mcaddr);
+ ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
+ dev_put(work->dev);
+ kfree(work);
+}
+
+static void rt6_probe(struct fib6_info *rt)
+{
+ struct __rt6_probe_work *work = NULL;
+ const struct in6_addr *nh_gw;
+ struct neighbour *neigh;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+
+ /*
+ * Okay, this does not seem to be appropriate
+ * for now, however, we need to check if it
+ * is really so; aka Router Reachability Probing.
+ *
+ * Router Reachability Probe MUST be rate-limited
+ * to no more than one per minute.
+ */
+ if (!rt || !(rt->fib6_flags & RTF_GATEWAY))
+ return;
+
+ nh_gw = &rt->fib6_nh.nh_gw;
+ dev = rt->fib6_nh.nh_dev;
+ rcu_read_lock_bh();
+ idev = __in6_dev_get(dev);
+ neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
+ if (neigh) {
+ if (neigh->nud_state & NUD_VALID)
+ goto out;
+
+ write_lock(&neigh->lock);
+ if (!(neigh->nud_state & NUD_VALID) &&
+ time_after(jiffies,
+ neigh->updated + idev->cnf.rtr_probe_interval)) {
+ work = kmalloc(sizeof(*work), GFP_ATOMIC);
+ if (work)
+ __neigh_set_probe_once(neigh);
+ }
+ write_unlock(&neigh->lock);
+ } else if (time_after(jiffies, rt->last_probe +
+ idev->cnf.rtr_probe_interval)) {
+ work = kmalloc(sizeof(*work), GFP_ATOMIC);
+ }
+
+ if (work) {
+ rt->last_probe = jiffies;
+ INIT_WORK(&work->work, rt6_probe_deferred);
+ work->target = *nh_gw;
+ dev_hold(dev);
+ work->dev = dev;
+ schedule_work(&work->work);
+ }
+
+out:
+ rcu_read_unlock_bh();
+}
+#else
+static inline void rt6_probe(struct fib6_info *rt)
+{
+}
+#endif
+
+/*
+ * Default Router Selection (RFC 2461 6.3.6)
+ */
+static inline int rt6_check_dev(struct fib6_info *rt, int oif)
+{
+ const struct net_device *dev = rt->fib6_nh.nh_dev;
+
+ if (!oif || dev->ifindex == oif)
+ return 2;
+ return 0;
+}
+
+static inline enum rt6_nud_state rt6_check_neigh(struct fib6_info *rt)
+{
+ enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
+ struct neighbour *neigh;
+
+ if (rt->fib6_flags & RTF_NONEXTHOP ||
+ !(rt->fib6_flags & RTF_GATEWAY))
+ return RT6_NUD_SUCCEED;
+
+ rcu_read_lock_bh();
+ neigh = __ipv6_neigh_lookup_noref(rt->fib6_nh.nh_dev,
+ &rt->fib6_nh.nh_gw);
+ if (neigh) {
+ read_lock(&neigh->lock);
+ if (neigh->nud_state & NUD_VALID)
+ ret = RT6_NUD_SUCCEED;
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ else if (!(neigh->nud_state & NUD_FAILED))
+ ret = RT6_NUD_SUCCEED;
+ else
+ ret = RT6_NUD_FAIL_PROBE;
+#endif
+ read_unlock(&neigh->lock);
+ } else {
+ ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
+ RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
+ }
+ rcu_read_unlock_bh();
+
+ return ret;
+}
+
+static int rt6_score_route(struct fib6_info *rt, int oif, int strict)
+{
+ int m;
+
+ m = rt6_check_dev(rt, oif);
+ if (!m && (strict & RT6_LOOKUP_F_IFACE))
+ return RT6_NUD_FAIL_HARD;
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->fib6_flags)) << 2;
+#endif
+ if (strict & RT6_LOOKUP_F_REACHABLE) {
+ int n = rt6_check_neigh(rt);
+ if (n < 0)
+ return n;
+ }
+ return m;
+}
+
+/* called with rc_read_lock held */
+static inline bool fib6_ignore_linkdown(const struct fib6_info *f6i)
+{
+ const struct net_device *dev = fib6_info_nh_dev(f6i);
+ bool rc = false;
+
+ if (dev) {
+ const struct inet6_dev *idev = __in6_dev_get(dev);
+
+ rc = !!idev->cnf.ignore_routes_with_linkdown;
+ }
+
+ return rc;
+}
+
+static struct fib6_info *find_match(struct fib6_info *rt, int oif, int strict,
+ int *mpri, struct fib6_info *match,
+ bool *do_rr)
+{
+ int m;
+ bool match_do_rr = false;
+
+ if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
+ goto out;
+
+ if (fib6_ignore_linkdown(rt) &&
+ rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
+ !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
+ goto out;
+
+ if (fib6_check_expired(rt))
+ goto out;
+
+ m = rt6_score_route(rt, oif, strict);
+ if (m == RT6_NUD_FAIL_DO_RR) {
+ match_do_rr = true;
+ m = 0; /* lowest valid score */
+ } else if (m == RT6_NUD_FAIL_HARD) {
+ goto out;
+ }
+
+ if (strict & RT6_LOOKUP_F_REACHABLE)
+ rt6_probe(rt);
+
+ /* note that m can be RT6_NUD_FAIL_PROBE at this point */
+ if (m > *mpri) {
+ *do_rr = match_do_rr;
+ *mpri = m;
+ match = rt;
+ }
+out:
+ return match;
+}
+
+static struct fib6_info *find_rr_leaf(struct fib6_node *fn,
+ struct fib6_info *leaf,
+ struct fib6_info *rr_head,
+ u32 metric, int oif, int strict,
+ bool *do_rr)
+{
+ struct fib6_info *rt, *match, *cont;
+ int mpri = -1;
+
+ match = NULL;
+ cont = NULL;
+ for (rt = rr_head; rt; rt = rcu_dereference(rt->fib6_next)) {
+ if (rt->fib6_metric != metric) {
+ cont = rt;
+ break;
+ }
+
+ match = find_match(rt, oif, strict, &mpri, match, do_rr);
+ }
+
+ for (rt = leaf; rt && rt != rr_head;
+ rt = rcu_dereference(rt->fib6_next)) {
+ if (rt->fib6_metric != metric) {
+ cont = rt;
+ break;
+ }
+
+ match = find_match(rt, oif, strict, &mpri, match, do_rr);
+ }
+
+ if (match || !cont)
+ return match;
+
+ for (rt = cont; rt; rt = rcu_dereference(rt->fib6_next))
+ match = find_match(rt, oif, strict, &mpri, match, do_rr);
+
+ return match;
+}
+
+static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn,
+ int oif, int strict)
+{
+ struct fib6_info *leaf = rcu_dereference(fn->leaf);
+ struct fib6_info *match, *rt0;
+ bool do_rr = false;
+ int key_plen;
+
+ if (!leaf || leaf == net->ipv6.fib6_null_entry)
+ return net->ipv6.fib6_null_entry;
+
+ rt0 = rcu_dereference(fn->rr_ptr);
+ if (!rt0)
+ rt0 = leaf;
+
+ /* Double check to make sure fn is not an intermediate node
+ * and fn->leaf does not points to its child's leaf
+ * (This might happen if all routes under fn are deleted from
+ * the tree and fib6_repair_tree() is called on the node.)
+ */
+ key_plen = rt0->fib6_dst.plen;
+#ifdef CONFIG_IPV6_SUBTREES
+ if (rt0->fib6_src.plen)
+ key_plen = rt0->fib6_src.plen;
+#endif
+ if (fn->fn_bit != key_plen)
+ return net->ipv6.fib6_null_entry;
+
+ match = find_rr_leaf(fn, leaf, rt0, rt0->fib6_metric, oif, strict,
+ &do_rr);
+
+ if (do_rr) {
+ struct fib6_info *next = rcu_dereference(rt0->fib6_next);
+
+ /* no entries matched; do round-robin */
+ if (!next || next->fib6_metric != rt0->fib6_metric)
+ next = leaf;
+
+ if (next != rt0) {
+ spin_lock_bh(&leaf->fib6_table->tb6_lock);
+ /* make sure next is not being deleted from the tree */
+ if (next->fib6_node)
+ rcu_assign_pointer(fn->rr_ptr, next);
+ spin_unlock_bh(&leaf->fib6_table->tb6_lock);
+ }
+ }
+
+ return match ? match : net->ipv6.fib6_null_entry;
+}
+
+static bool rt6_is_gw_or_nonexthop(const struct fib6_info *rt)
+{
+ return (rt->fib6_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
+}
+
+#ifdef CONFIG_IPV6_ROUTE_INFO
+int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
+ const struct in6_addr *gwaddr)
+{
+ struct net *net = dev_net(dev);
+ struct route_info *rinfo = (struct route_info *) opt;
+ struct in6_addr prefix_buf, *prefix;
+ unsigned int pref;
+ unsigned long lifetime;
+ struct fib6_info *rt;
+
+ if (len < sizeof(struct route_info)) {
+ return -EINVAL;
+ }
+
+ /* Sanity check for prefix_len and length */
+ if (rinfo->length > 3) {
+ return -EINVAL;
+ } else if (rinfo->prefix_len > 128) {
+ return -EINVAL;
+ } else if (rinfo->prefix_len > 64) {
+ if (rinfo->length < 2) {
+ return -EINVAL;
+ }
+ } else if (rinfo->prefix_len > 0) {
+ if (rinfo->length < 1) {
+ return -EINVAL;
+ }
+ }
+
+ pref = rinfo->route_pref;
+ if (pref == ICMPV6_ROUTER_PREF_INVALID)
+ return -EINVAL;
+
+ lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
+
+ if (rinfo->length == 3)
+ prefix = (struct in6_addr *)rinfo->prefix;
+ else {
+ /* this function is safe */
+ ipv6_addr_prefix(&prefix_buf,
+ (struct in6_addr *)rinfo->prefix,
+ rinfo->prefix_len);
+ prefix = &prefix_buf;
+ }
+
+ if (rinfo->prefix_len == 0)
+ rt = rt6_get_dflt_router(net, gwaddr, dev);
+ else
+ rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
+ gwaddr, dev);
+
+ if (rt && !lifetime) {
+ ip6_del_rt(net, rt);
+ rt = NULL;
+ }
+
+ if (!rt && lifetime)
+ rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
+ dev, pref);
+ else if (rt)
+ rt->fib6_flags = RTF_ROUTEINFO |
+ (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
+
+ if (rt) {
+ if (!addrconf_finite_timeout(lifetime))
+ fib6_clean_expires(rt);
+ else
+ fib6_set_expires(rt, jiffies + HZ * lifetime);
+
+ fib6_info_release(rt);
+ }
+ return 0;
+}
+#endif
+
+/*
+ * Misc support functions
+ */
+
+/* called with rcu_lock held */
+static struct net_device *ip6_rt_get_dev_rcu(struct fib6_info *rt)
+{
+ struct net_device *dev = rt->fib6_nh.nh_dev;
+
+ if (rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
+ /* for copies of local routes, dst->dev needs to be the
+ * device if it is a master device, the master device if
+ * device is enslaved, and the loopback as the default
+ */
+ if (netif_is_l3_slave(dev) &&
+ !rt6_need_strict(&rt->fib6_dst.addr))
+ dev = l3mdev_master_dev_rcu(dev);
+ else if (!netif_is_l3_master(dev))
+ dev = dev_net(dev)->loopback_dev;
+ /* last case is netif_is_l3_master(dev) is true in which
+ * case we want dev returned to be dev
+ */
+ }
+
+ return dev;
+}
+
+static const int fib6_prop[RTN_MAX + 1] = {
+ [RTN_UNSPEC] = 0,
+ [RTN_UNICAST] = 0,
+ [RTN_LOCAL] = 0,
+ [RTN_BROADCAST] = 0,
+ [RTN_ANYCAST] = 0,
+ [RTN_MULTICAST] = 0,
+ [RTN_BLACKHOLE] = -EINVAL,
+ [RTN_UNREACHABLE] = -EHOSTUNREACH,
+ [RTN_PROHIBIT] = -EACCES,
+ [RTN_THROW] = -EAGAIN,
+ [RTN_NAT] = -EINVAL,
+ [RTN_XRESOLVE] = -EINVAL,
+};
+
+static int ip6_rt_type_to_error(u8 fib6_type)
+{
+ return fib6_prop[fib6_type];
+}
+
+static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
+{
+ unsigned short flags = 0;
+
+ if (rt->dst_nocount)
+ flags |= DST_NOCOUNT;
+ if (rt->dst_nopolicy)
+ flags |= DST_NOPOLICY;
+ if (rt->dst_host)
+ flags |= DST_HOST;
+
+ return flags;
+}
+
+static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct fib6_info *ort)
+{
+ rt->dst.error = ip6_rt_type_to_error(ort->fib6_type);
+
+ switch (ort->fib6_type) {
+ case RTN_BLACKHOLE:
+ rt->dst.output = dst_discard_out;
+ rt->dst.input = dst_discard;
+ break;
+ case RTN_PROHIBIT:
+ rt->dst.output = ip6_pkt_prohibit_out;
+ rt->dst.input = ip6_pkt_prohibit;
+ break;
+ case RTN_THROW:
+ case RTN_UNREACHABLE:
+ default:
+ rt->dst.output = ip6_pkt_discard_out;
+ rt->dst.input = ip6_pkt_discard;
+ break;
+ }
+}
+
+static void ip6_rt_init_dst(struct rt6_info *rt, struct fib6_info *ort)
+{
+ if (ort->fib6_flags & RTF_REJECT) {
+ ip6_rt_init_dst_reject(rt, ort);
+ return;
+ }
+
+ rt->dst.error = 0;
+ rt->dst.output = ip6_output;
+
+ if (ort->fib6_type == RTN_LOCAL || ort->fib6_type == RTN_ANYCAST) {
+ rt->dst.input = ip6_input;
+ } else if (ipv6_addr_type(&ort->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
+ rt->dst.input = ip6_mc_input;
+ } else {
+ rt->dst.input = ip6_forward;
+ }
+
+ if (ort->fib6_nh.nh_lwtstate) {
+ rt->dst.lwtstate = lwtstate_get(ort->fib6_nh.nh_lwtstate);
+ lwtunnel_set_redirect(&rt->dst);
+ }
+
+ rt->dst.lastuse = jiffies;
+}
+
+/* Caller must already hold reference to @from */
+static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
+{
+ rt->rt6i_flags &= ~RTF_EXPIRES;
+ rcu_assign_pointer(rt->from, from);
+ dst_init_metrics(&rt->dst, from->fib6_metrics->metrics, true);
+ if (from->fib6_metrics != &dst_default_metrics) {
+ rt->dst._metrics |= DST_METRICS_REFCOUNTED;
+ refcount_inc(&from->fib6_metrics->refcnt);
+ }
+}
+
+/* Caller must already hold reference to @ort */
+static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort)
+{
+ struct net_device *dev = fib6_info_nh_dev(ort);
+
+ ip6_rt_init_dst(rt, ort);
+
+ rt->rt6i_dst = ort->fib6_dst;
+ rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
+ rt->rt6i_gateway = ort->fib6_nh.nh_gw;
+ rt->rt6i_flags = ort->fib6_flags;
+ rt6_set_from(rt, ort);
+#ifdef CONFIG_IPV6_SUBTREES
+ rt->rt6i_src = ort->fib6_src;
+#endif
+ rt->rt6i_prefsrc = ort->fib6_prefsrc;
+}
+
+static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
+ struct in6_addr *saddr)
+{
+ struct fib6_node *pn, *sn;
+ while (1) {
+ if (fn->fn_flags & RTN_TL_ROOT)
+ return NULL;
+ pn = rcu_dereference(fn->parent);
+ sn = FIB6_SUBTREE(pn);
+ if (sn && sn != fn)
+ fn = fib6_node_lookup(sn, NULL, saddr);
+ else
+ fn = pn;
+ if (fn->fn_flags & RTN_RTINFO)
+ return fn;
+ }
+}
+
+static bool ip6_hold_safe(struct net *net, struct rt6_info **prt,
+ bool null_fallback)
+{
+ struct rt6_info *rt = *prt;
+
+ if (dst_hold_safe(&rt->dst))
+ return true;
+ if (null_fallback) {
+ rt = net->ipv6.ip6_null_entry;
+ dst_hold(&rt->dst);
+ } else {
+ rt = NULL;
+ }
+ *prt = rt;
+ return false;
+}
+
+/* called with rcu_lock held */
+static struct rt6_info *ip6_create_rt_rcu(struct fib6_info *rt)
+{
+ unsigned short flags = fib6_info_dst_flags(rt);
+ struct net_device *dev = rt->fib6_nh.nh_dev;
+ struct rt6_info *nrt;
+
+ if (!fib6_info_hold_safe(rt))
+ return NULL;
+
+ nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
+ if (nrt)
+ ip6_rt_copy_init(nrt, rt);
+ else
+ fib6_info_release(rt);
+
+ return nrt;
+}
+
+static struct rt6_info *ip6_pol_route_lookup(struct net *net,
+ struct fib6_table *table,
+ struct flowi6 *fl6,
+ const struct sk_buff *skb,
+ int flags)
+{
+ struct fib6_info *f6i;
+ struct fib6_node *fn;
+ struct rt6_info *rt;
+
+ if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
+ flags &= ~RT6_LOOKUP_F_IFACE;
+
+ rcu_read_lock();
+ fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
+restart:
+ f6i = rcu_dereference(fn->leaf);
+ if (!f6i) {
+ f6i = net->ipv6.fib6_null_entry;
+ } else {
+ f6i = rt6_device_match(net, f6i, &fl6->saddr,
+ fl6->flowi6_oif, flags);
+ if (f6i->fib6_nsiblings && fl6->flowi6_oif == 0)
+ f6i = fib6_multipath_select(net, f6i, fl6,
+ fl6->flowi6_oif, skb,
+ flags);
+ }
+ if (f6i == net->ipv6.fib6_null_entry) {
+ fn = fib6_backtrack(fn, &fl6->saddr);
+ if (fn)
+ goto restart;
+ }
+
+ trace_fib6_table_lookup(net, f6i, table, fl6);
+
+ /* Search through exception table */
+ rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
+ if (rt) {
+ if (ip6_hold_safe(net, &rt, true))
+ dst_use_noref(&rt->dst, jiffies);
+ } else if (f6i == net->ipv6.fib6_null_entry) {
+ rt = net->ipv6.ip6_null_entry;
+ dst_hold(&rt->dst);
+ } else {
+ rt = ip6_create_rt_rcu(f6i);
+ if (!rt) {
+ rt = net->ipv6.ip6_null_entry;
+ dst_hold(&rt->dst);
+ }
+ }
+
+ rcu_read_unlock();
+
+ return rt;
+}
+
+struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
+ const struct sk_buff *skb, int flags)
+{
+ return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
+}
+EXPORT_SYMBOL_GPL(ip6_route_lookup);
+
+struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
+ const struct in6_addr *saddr, int oif,
+ const struct sk_buff *skb, int strict)
+{
+ struct flowi6 fl6 = {
+ .flowi6_oif = oif,
+ .daddr = *daddr,
+ };
+ struct dst_entry *dst;
+ int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
+
+ if (saddr) {
+ memcpy(&fl6.saddr, saddr, sizeof(*saddr));
+ flags |= RT6_LOOKUP_F_HAS_SADDR;
+ }
+
+ dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
+ if (dst->error == 0)
+ return (struct rt6_info *) dst;
+
+ dst_release(dst);
+
+ return NULL;
+}
+EXPORT_SYMBOL(rt6_lookup);
+
+/* ip6_ins_rt is called with FREE table->tb6_lock.
+ * It takes new route entry, the addition fails by any reason the
+ * route is released.
+ * Caller must hold dst before calling it.
+ */
+
+static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
+ struct netlink_ext_ack *extack)
+{
+ int err;
+ struct fib6_table *table;
+
+ table = rt->fib6_table;
+ spin_lock_bh(&table->tb6_lock);
+ err = fib6_add(&table->tb6_root, rt, info, extack);
+ spin_unlock_bh(&table->tb6_lock);
+
+ return err;
+}
+
+int ip6_ins_rt(struct net *net, struct fib6_info *rt)
+{
+ struct nl_info info = { .nl_net = net, };
+
+ return __ip6_ins_rt(rt, &info, NULL);
+}
+
+static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
+{
+ struct net_device *dev;
+ struct rt6_info *rt;
+
+ /*
+ * Clone the route.
+ */
+
+ if (!fib6_info_hold_safe(ort))
+ return NULL;
+
+ dev = ip6_rt_get_dev_rcu(ort);
+ rt = ip6_dst_alloc(dev_net(dev), dev, 0);
+ if (!rt) {
+ fib6_info_release(ort);
+ return NULL;
+ }
+
+ ip6_rt_copy_init(rt, ort);
+ rt->rt6i_flags |= RTF_CACHE;
+ rt->dst.flags |= DST_HOST;
+ rt->rt6i_dst.addr = *daddr;
+ rt->rt6i_dst.plen = 128;
+
+ if (!rt6_is_gw_or_nonexthop(ort)) {
+ if (ort->fib6_dst.plen != 128 &&
+ ipv6_addr_equal(&ort->fib6_dst.addr, daddr))
+ rt->rt6i_flags |= RTF_ANYCAST;
+#ifdef CONFIG_IPV6_SUBTREES
+ if (rt->rt6i_src.plen && saddr) {
+ rt->rt6i_src.addr = *saddr;
+ rt->rt6i_src.plen = 128;
+ }
+#endif
+ }
+
+ return rt;
+}
+
+static struct rt6_info *ip6_rt_pcpu_alloc(struct fib6_info *rt)
+{
+ unsigned short flags = fib6_info_dst_flags(rt);
+ struct net_device *dev;
+ struct rt6_info *pcpu_rt;
+
+ if (!fib6_info_hold_safe(rt))
+ return NULL;
+
+ rcu_read_lock();
+ dev = ip6_rt_get_dev_rcu(rt);
+ pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags);
+ rcu_read_unlock();
+ if (!pcpu_rt) {
+ fib6_info_release(rt);
+ return NULL;
+ }
+ ip6_rt_copy_init(pcpu_rt, rt);
+ pcpu_rt->rt6i_flags |= RTF_PCPU;
+ return pcpu_rt;
+}
+
+/* It should be called with rcu_read_lock() acquired */
+static struct rt6_info *rt6_get_pcpu_route(struct fib6_info *rt)
+{
+ struct rt6_info *pcpu_rt, **p;
+
+ p = this_cpu_ptr(rt->rt6i_pcpu);
+ pcpu_rt = *p;
+
+ if (pcpu_rt)
+ ip6_hold_safe(NULL, &pcpu_rt, false);
+
+ return pcpu_rt;
+}
+
+static struct rt6_info *rt6_make_pcpu_route(struct net *net,
+ struct fib6_info *rt)
+{
+ struct rt6_info *pcpu_rt, *prev, **p;
+
+ pcpu_rt = ip6_rt_pcpu_alloc(rt);
+ if (!pcpu_rt) {
+ dst_hold(&net->ipv6.ip6_null_entry->dst);
+ return net->ipv6.ip6_null_entry;
+ }
+
+ dst_hold(&pcpu_rt->dst);
+ p = this_cpu_ptr(rt->rt6i_pcpu);
+ prev = cmpxchg(p, NULL, pcpu_rt);
+ BUG_ON(prev);
+
+ return pcpu_rt;
+}
+
+/* exception hash table implementation
+ */
+static DEFINE_SPINLOCK(rt6_exception_lock);
+
+/* Remove rt6_ex from hash table and free the memory
+ * Caller must hold rt6_exception_lock
+ */
+static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
+ struct rt6_exception *rt6_ex)
+{
+ struct net *net;
+
+ if (!bucket || !rt6_ex)
+ return;
+
+ net = dev_net(rt6_ex->rt6i->dst.dev);
+ hlist_del_rcu(&rt6_ex->hlist);
+ dst_release(&rt6_ex->rt6i->dst);
+ kfree_rcu(rt6_ex, rcu);
+ WARN_ON_ONCE(!bucket->depth);
+ bucket->depth--;
+ net->ipv6.rt6_stats->fib_rt_cache--;
+}
+
+/* Remove oldest rt6_ex in bucket and free the memory
+ * Caller must hold rt6_exception_lock
+ */
+static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
+{
+ struct rt6_exception *rt6_ex, *oldest = NULL;
+
+ if (!bucket)
+ return;
+
+ hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
+ if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
+ oldest = rt6_ex;
+ }
+ rt6_remove_exception(bucket, oldest);
+}
+
+static u32 rt6_exception_hash(const struct in6_addr *dst,
+ const struct in6_addr *src)
+{
+ static u32 seed __read_mostly;
+ u32 val;
+
+ net_get_random_once(&seed, sizeof(seed));
+ val = jhash(dst, sizeof(*dst), seed);
+
+#ifdef CONFIG_IPV6_SUBTREES
+ if (src)
+ val = jhash(src, sizeof(*src), val);
+#endif
+ return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
+}
+
+/* Helper function to find the cached rt in the hash table
+ * and update bucket pointer to point to the bucket for this
+ * (daddr, saddr) pair
+ * Caller must hold rt6_exception_lock
+ */
+static struct rt6_exception *
+__rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
+{
+ struct rt6_exception *rt6_ex;
+ u32 hval;
+
+ if (!(*bucket) || !daddr)
+ return NULL;
+
+ hval = rt6_exception_hash(daddr, saddr);
+ *bucket += hval;
+
+ hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
+ struct rt6_info *rt6 = rt6_ex->rt6i;
+ bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
+
+#ifdef CONFIG_IPV6_SUBTREES
+ if (matched && saddr)
+ matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
+#endif
+ if (matched)
+ return rt6_ex;
+ }
+ return NULL;
+}
+
+/* Helper function to find the cached rt in the hash table
+ * and update bucket pointer to point to the bucket for this
+ * (daddr, saddr) pair
+ * Caller must hold rcu_read_lock()
+ */
+static struct rt6_exception *
+__rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
+{
+ struct rt6_exception *rt6_ex;
+ u32 hval;
+
+ WARN_ON_ONCE(!rcu_read_lock_held());
+
+ if (!(*bucket) || !daddr)
+ return NULL;
+
+ hval = rt6_exception_hash(daddr, saddr);
+ *bucket += hval;
+
+ hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
+ struct rt6_info *rt6 = rt6_ex->rt6i;
+ bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
+
+#ifdef CONFIG_IPV6_SUBTREES
+ if (matched && saddr)
+ matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
+#endif
+ if (matched)
+ return rt6_ex;
+ }
+ return NULL;
+}
+
+static unsigned int fib6_mtu(const struct fib6_info *rt)
+{
+ unsigned int mtu;
+
+ if (rt->fib6_pmtu) {
+ mtu = rt->fib6_pmtu;
+ } else {
+ struct net_device *dev = fib6_info_nh_dev(rt);
+ struct inet6_dev *idev;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ mtu = idev->cnf.mtu6;
+ rcu_read_unlock();
+ }
+
+ mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
+
+ return mtu - lwtunnel_headroom(rt->fib6_nh.nh_lwtstate, mtu);
+}
+
+static int rt6_insert_exception(struct rt6_info *nrt,
+ struct fib6_info *ort)
+{
+ struct net *net = dev_net(nrt->dst.dev);
+ struct rt6_exception_bucket *bucket;
+ struct in6_addr *src_key = NULL;
+ struct rt6_exception *rt6_ex;
+ int err = 0;
+
+ spin_lock_bh(&rt6_exception_lock);
+
+ if (ort->exception_bucket_flushed) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ bucket = rcu_dereference_protected(ort->rt6i_exception_bucket,
+ lockdep_is_held(&rt6_exception_lock));
+ if (!bucket) {
+ bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
+ GFP_ATOMIC);
+ if (!bucket) {
+ err = -ENOMEM;
+ goto out;
+ }
+ rcu_assign_pointer(ort->rt6i_exception_bucket, bucket);
+ }
+
+#ifdef CONFIG_IPV6_SUBTREES
+ /* rt6i_src.plen != 0 indicates ort is in subtree
+ * and exception table is indexed by a hash of
+ * both rt6i_dst and rt6i_src.
+ * Otherwise, the exception table is indexed by
+ * a hash of only rt6i_dst.
+ */
+ if (ort->fib6_src.plen)
+ src_key = &nrt->rt6i_src.addr;
+#endif
+
+ /* Update rt6i_prefsrc as it could be changed
+ * in rt6_remove_prefsrc()
+ */
+ nrt->rt6i_prefsrc = ort->fib6_prefsrc;
+ /* rt6_mtu_change() might lower mtu on ort.
+ * Only insert this exception route if its mtu
+ * is less than ort's mtu value.
+ */
+ if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(ort)) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
+ src_key);
+ if (rt6_ex)
+ rt6_remove_exception(bucket, rt6_ex);
+
+ rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
+ if (!rt6_ex) {
+ err = -ENOMEM;
+ goto out;
+ }
+ rt6_ex->rt6i = nrt;
+ rt6_ex->stamp = jiffies;
+ hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
+ bucket->depth++;
+ net->ipv6.rt6_stats->fib_rt_cache++;
+
+ if (bucket->depth > FIB6_MAX_DEPTH)
+ rt6_exception_remove_oldest(bucket);
+
+out:
+ spin_unlock_bh(&rt6_exception_lock);
+
+ /* Update fn->fn_sernum to invalidate all cached dst */
+ if (!err) {
+ spin_lock_bh(&ort->fib6_table->tb6_lock);
+ fib6_update_sernum(net, ort);
+ spin_unlock_bh(&ort->fib6_table->tb6_lock);
+ fib6_force_start_gc(net);
+ }
+
+ return err;
+}
+
+void rt6_flush_exceptions(struct fib6_info *rt)
+{
+ struct rt6_exception_bucket *bucket;
+ struct rt6_exception *rt6_ex;
+ struct hlist_node *tmp;
+ int i;
+
+ spin_lock_bh(&rt6_exception_lock);
+ /* Prevent rt6_insert_exception() to recreate the bucket list */
+ rt->exception_bucket_flushed = 1;
+
+ bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
+ lockdep_is_held(&rt6_exception_lock));
+ if (!bucket)
+ goto out;
+
+ for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
+ hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist)
+ rt6_remove_exception(bucket, rt6_ex);
+ WARN_ON_ONCE(bucket->depth);
+ bucket++;
+ }
+
+out:
+ spin_unlock_bh(&rt6_exception_lock);
+}
+
+/* Find cached rt in the hash table inside passed in rt
+ * Caller has to hold rcu_read_lock()
+ */
+static struct rt6_info *rt6_find_cached_rt(struct fib6_info *rt,
+ struct in6_addr *daddr,
+ struct in6_addr *saddr)
+{
+ struct rt6_exception_bucket *bucket;
+ struct in6_addr *src_key = NULL;
+ struct rt6_exception *rt6_ex;
+ struct rt6_info *res = NULL;
+
+ bucket = rcu_dereference(rt->rt6i_exception_bucket);
+
+#ifdef CONFIG_IPV6_SUBTREES
+ /* rt6i_src.plen != 0 indicates rt is in subtree
+ * and exception table is indexed by a hash of
+ * both rt6i_dst and rt6i_src.
+ * Otherwise, the exception table is indexed by
+ * a hash of only rt6i_dst.
+ */
+ if (rt->fib6_src.plen)
+ src_key = saddr;
+#endif
+ rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
+
+ if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
+ res = rt6_ex->rt6i;
+
+ return res;
+}
+
+/* Remove the passed in cached rt from the hash table that contains it */
+static int rt6_remove_exception_rt(struct rt6_info *rt)
+{
+ struct rt6_exception_bucket *bucket;
+ struct in6_addr *src_key = NULL;
+ struct rt6_exception *rt6_ex;
+ struct fib6_info *from;
+ int err;
+
+ from = rcu_dereference(rt->from);
+ if (!from ||
+ !(rt->rt6i_flags & RTF_CACHE))
+ return -EINVAL;
+
+ if (!rcu_access_pointer(from->rt6i_exception_bucket))
+ return -ENOENT;
+
+ spin_lock_bh(&rt6_exception_lock);
+ bucket = rcu_dereference_protected(from->rt6i_exception_bucket,
+ lockdep_is_held(&rt6_exception_lock));
+#ifdef CONFIG_IPV6_SUBTREES
+ /* rt6i_src.plen != 0 indicates 'from' is in subtree
+ * and exception table is indexed by a hash of
+ * both rt6i_dst and rt6i_src.
+ * Otherwise, the exception table is indexed by
+ * a hash of only rt6i_dst.
+ */
+ if (from->fib6_src.plen)
+ src_key = &rt->rt6i_src.addr;
+#endif
+ rt6_ex = __rt6_find_exception_spinlock(&bucket,
+ &rt->rt6i_dst.addr,
+ src_key);
+ if (rt6_ex) {
+ rt6_remove_exception(bucket, rt6_ex);
+ err = 0;
+ } else {
+ err = -ENOENT;
+ }
+
+ spin_unlock_bh(&rt6_exception_lock);
+ return err;
+}
+
+/* Find rt6_ex which contains the passed in rt cache and
+ * refresh its stamp
+ */
+static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
+{
+ struct rt6_exception_bucket *bucket;
+ struct fib6_info *from = rt->from;
+ struct in6_addr *src_key = NULL;
+ struct rt6_exception *rt6_ex;
+
+ if (!from ||
+ !(rt->rt6i_flags & RTF_CACHE))
+ return;
+
+ rcu_read_lock();
+ bucket = rcu_dereference(from->rt6i_exception_bucket);
+
+#ifdef CONFIG_IPV6_SUBTREES
+ /* rt6i_src.plen != 0 indicates 'from' is in subtree
+ * and exception table is indexed by a hash of
+ * both rt6i_dst and rt6i_src.
+ * Otherwise, the exception table is indexed by
+ * a hash of only rt6i_dst.
+ */
+ if (from->fib6_src.plen)
+ src_key = &rt->rt6i_src.addr;
+#endif
+ rt6_ex = __rt6_find_exception_rcu(&bucket,
+ &rt->rt6i_dst.addr,
+ src_key);
+ if (rt6_ex)
+ rt6_ex->stamp = jiffies;
+
+ rcu_read_unlock();
+}
+
+static void rt6_exceptions_remove_prefsrc(struct fib6_info *rt)
+{
+ struct rt6_exception_bucket *bucket;
+ struct rt6_exception *rt6_ex;
+ int i;
+
+ bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
+ lockdep_is_held(&rt6_exception_lock));
+
+ if (bucket) {
+ for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
+ hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
+ rt6_ex->rt6i->rt6i_prefsrc.plen = 0;
+ }
+ bucket++;
+ }
+ }
+}
+
+static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
+ struct rt6_info *rt, int mtu)
+{
+ /* If the new MTU is lower than the route PMTU, this new MTU will be the
+ * lowest MTU in the path: always allow updating the route PMTU to
+ * reflect PMTU decreases.
+ *
+ * If the new MTU is higher, and the route PMTU is equal to the local
+ * MTU, this means the old MTU is the lowest in the path, so allow
+ * updating it: if other nodes now have lower MTUs, PMTU discovery will
+ * handle this.
+ */
+
+ if (dst_mtu(&rt->dst) >= mtu)
+ return true;
+
+ if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
+ return true;
+
+ return false;
+}
+
+static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
+ struct fib6_info *rt, int mtu)
+{
+ struct rt6_exception_bucket *bucket;
+ struct rt6_exception *rt6_ex;
+ int i;
+
+ bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
+ lockdep_is_held(&rt6_exception_lock));
+
+ if (!bucket)
+ return;
+
+ for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
+ hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
+ struct rt6_info *entry = rt6_ex->rt6i;
+
+ /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected
+ * route), the metrics of its rt->from have already
+ * been updated.
+ */
+ if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
+ rt6_mtu_change_route_allowed(idev, entry, mtu))
+ dst_metric_set(&entry->dst, RTAX_MTU, mtu);
+ }
+ bucket++;
+ }
+}
+
+#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
+
+static void rt6_exceptions_clean_tohost(struct fib6_info *rt,
+ struct in6_addr *gateway)
+{
+ struct rt6_exception_bucket *bucket;
+ struct rt6_exception *rt6_ex;
+ struct hlist_node *tmp;
+ int i;
+
+ if (!rcu_access_pointer(rt->rt6i_exception_bucket))
+ return;
+
+ spin_lock_bh(&rt6_exception_lock);
+ bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
+ lockdep_is_held(&rt6_exception_lock));
+
+ if (bucket) {
+ for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
+ hlist_for_each_entry_safe(rt6_ex, tmp,
+ &bucket->chain, hlist) {
+ struct rt6_info *entry = rt6_ex->rt6i;
+
+ if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
+ RTF_CACHE_GATEWAY &&
+ ipv6_addr_equal(gateway,
+ &entry->rt6i_gateway)) {
+ rt6_remove_exception(bucket, rt6_ex);
+ }
+ }
+ bucket++;
+ }
+ }
+
+ spin_unlock_bh(&rt6_exception_lock);
+}
+
+static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
+ struct rt6_exception *rt6_ex,
+ struct fib6_gc_args *gc_args,
+ unsigned long now)
+{
+ struct rt6_info *rt = rt6_ex->rt6i;
+
+ /* we are pruning and obsoleting aged-out and non gateway exceptions
+ * even if others have still references to them, so that on next
+ * dst_check() such references can be dropped.
+ * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when
+ * expired, independently from their aging, as per RFC 8201 section 4
+ */
+ if (!(rt->rt6i_flags & RTF_EXPIRES)) {
+ if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
+ RT6_TRACE("aging clone %p\n", rt);
+ rt6_remove_exception(bucket, rt6_ex);
+ return;
+ }
+ } else if (time_after(jiffies, rt->dst.expires)) {
+ RT6_TRACE("purging expired route %p\n", rt);
+ rt6_remove_exception(bucket, rt6_ex);
+ return;
+ }
+
+ if (rt->rt6i_flags & RTF_GATEWAY) {
+ struct neighbour *neigh;
+ __u8 neigh_flags = 0;
+
+ neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
+ if (neigh)
+ neigh_flags = neigh->flags;
+
+ if (!(neigh_flags & NTF_ROUTER)) {
+ RT6_TRACE("purging route %p via non-router but gateway\n",
+ rt);
+ rt6_remove_exception(bucket, rt6_ex);
+ return;
+ }
+ }
+
+ gc_args->more++;
+}
+
+void rt6_age_exceptions(struct fib6_info *rt,
+ struct fib6_gc_args *gc_args,
+ unsigned long now)
+{
+ struct rt6_exception_bucket *bucket;
+ struct rt6_exception *rt6_ex;
+ struct hlist_node *tmp;
+ int i;
+
+ if (!rcu_access_pointer(rt->rt6i_exception_bucket))
+ return;
+
+ rcu_read_lock_bh();
+ spin_lock(&rt6_exception_lock);
+ bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
+ lockdep_is_held(&rt6_exception_lock));
+
+ if (bucket) {
+ for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
+ hlist_for_each_entry_safe(rt6_ex, tmp,
+ &bucket->chain, hlist) {
+ rt6_age_examine_exception(bucket, rt6_ex,
+ gc_args, now);
+ }
+ bucket++;
+ }
+ }
+ spin_unlock(&rt6_exception_lock);
+ rcu_read_unlock_bh();
+}
+
+/* must be called with rcu lock held */
+struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
+ int oif, struct flowi6 *fl6, int strict)
+{
+ struct fib6_node *fn, *saved_fn;
+ struct fib6_info *f6i;
+
+ fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
+ saved_fn = fn;
+
+ if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
+ oif = 0;
+
+redo_rt6_select:
+ f6i = rt6_select(net, fn, oif, strict);
+ if (f6i == net->ipv6.fib6_null_entry) {
+ fn = fib6_backtrack(fn, &fl6->saddr);
+ if (fn)
+ goto redo_rt6_select;
+ else if (strict & RT6_LOOKUP_F_REACHABLE) {
+ /* also consider unreachable route */
+ strict &= ~RT6_LOOKUP_F_REACHABLE;
+ fn = saved_fn;
+ goto redo_rt6_select;
+ }
+ }
+
+ trace_fib6_table_lookup(net, f6i, table, fl6);
+
+ return f6i;
+}
+
+struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
+ int oif, struct flowi6 *fl6,
+ const struct sk_buff *skb, int flags)
+{
+ struct fib6_info *f6i;
+ struct rt6_info *rt;
+ int strict = 0;
+
+ strict |= flags & RT6_LOOKUP_F_IFACE;
+ strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
+ if (net->ipv6.devconf_all->forwarding == 0)
+ strict |= RT6_LOOKUP_F_REACHABLE;
+
+ rcu_read_lock();
+
+ f6i = fib6_table_lookup(net, table, oif, fl6, strict);
+ if (f6i->fib6_nsiblings)
+ f6i = fib6_multipath_select(net, f6i, fl6, oif, skb, strict);
+
+ if (f6i == net->ipv6.fib6_null_entry) {
+ rt = net->ipv6.ip6_null_entry;
+ rcu_read_unlock();
+ dst_hold(&rt->dst);
+ return rt;
+ }
+
+ /*Search through exception table */
+ rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
+ if (rt) {
+ if (ip6_hold_safe(net, &rt, true))
+ dst_use_noref(&rt->dst, jiffies);
+
+ rcu_read_unlock();
+ return rt;
+ } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
+ !(f6i->fib6_flags & RTF_GATEWAY))) {
+ /* Create a RTF_CACHE clone which will not be
+ * owned by the fib6 tree. It is for the special case where
+ * the daddr in the skb during the neighbor look-up is different
+ * from the fl6->daddr used to look-up route here.
+ */
+ struct rt6_info *uncached_rt;
+
+ uncached_rt = ip6_rt_cache_alloc(f6i, &fl6->daddr, NULL);
+
+ rcu_read_unlock();
+
+ if (uncached_rt) {
+ /* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc()
+ * No need for another dst_hold()
+ */
+ rt6_uncached_list_add(uncached_rt);
+ atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
+ } else {
+ uncached_rt = net->ipv6.ip6_null_entry;
+ dst_hold(&uncached_rt->dst);
+ }
+
+ return uncached_rt;
+ } else {
+ /* Get a percpu copy */
+
+ struct rt6_info *pcpu_rt;
+
+ local_bh_disable();
+ pcpu_rt = rt6_get_pcpu_route(f6i);
+
+ if (!pcpu_rt)
+ pcpu_rt = rt6_make_pcpu_route(net, f6i);
+
+ local_bh_enable();
+ rcu_read_unlock();
+
+ return pcpu_rt;
+ }
+}
+EXPORT_SYMBOL_GPL(ip6_pol_route);
+
+static struct rt6_info *ip6_pol_route_input(struct net *net,
+ struct fib6_table *table,
+ struct flowi6 *fl6,
+ const struct sk_buff *skb,
+ int flags)
+{
+ return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
+}
+
+struct dst_entry *ip6_route_input_lookup(struct net *net,
+ struct net_device *dev,
+ struct flowi6 *fl6,
+ const struct sk_buff *skb,
+ int flags)
+{
+ if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
+ flags |= RT6_LOOKUP_F_IFACE;
+
+ return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
+}
+EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
+
+static void ip6_multipath_l3_keys(const struct sk_buff *skb,
+ struct flow_keys *keys,
+ struct flow_keys *flkeys)
+{
+ const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
+ const struct ipv6hdr *key_iph = outer_iph;
+ struct flow_keys *_flkeys = flkeys;
+ const struct ipv6hdr *inner_iph;
+ const struct icmp6hdr *icmph;
+ struct ipv6hdr _inner_iph;
+ struct icmp6hdr _icmph;
+
+ if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
+ goto out;
+
+ icmph = skb_header_pointer(skb, skb_transport_offset(skb),
+ sizeof(_icmph), &_icmph);
+ if (!icmph)
+ goto out;
+
+ if (icmph->icmp6_type != ICMPV6_DEST_UNREACH &&
+ icmph->icmp6_type != ICMPV6_PKT_TOOBIG &&
+ icmph->icmp6_type != ICMPV6_TIME_EXCEED &&
+ icmph->icmp6_type != ICMPV6_PARAMPROB)
+ goto out;
+
+ inner_iph = skb_header_pointer(skb,
+ skb_transport_offset(skb) + sizeof(*icmph),
+ sizeof(_inner_iph), &_inner_iph);
+ if (!inner_iph)
+ goto out;
+
+ key_iph = inner_iph;
+ _flkeys = NULL;
+out:
+ if (_flkeys) {
+ keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
+ keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
+ keys->tags.flow_label = _flkeys->tags.flow_label;
+ keys->basic.ip_proto = _flkeys->basic.ip_proto;
+ } else {
+ keys->addrs.v6addrs.src = key_iph->saddr;
+ keys->addrs.v6addrs.dst = key_iph->daddr;
+ keys->tags.flow_label = ip6_flowlabel(key_iph);
+ keys->basic.ip_proto = key_iph->nexthdr;
+ }
+}
+
+/* if skb is set it will be used and fl6 can be NULL */
+u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
+ const struct sk_buff *skb, struct flow_keys *flkeys)
+{
+ struct flow_keys hash_keys;
+ u32 mhash;
+
+ switch (ip6_multipath_hash_policy(net)) {
+ case 0:
+ memset(&hash_keys, 0, sizeof(hash_keys));
+ hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
+ if (skb) {
+ ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
+ } else {
+ hash_keys.addrs.v6addrs.src = fl6->saddr;
+ hash_keys.addrs.v6addrs.dst = fl6->daddr;
+ hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
+ hash_keys.basic.ip_proto = fl6->flowi6_proto;
+ }
+ break;
+ case 1:
+ if (skb) {
+ unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
+ struct flow_keys keys;
+
+ /* short-circuit if we already have L4 hash present */
+ if (skb->l4_hash)
+ return skb_get_hash_raw(skb) >> 1;
+
+ memset(&hash_keys, 0, sizeof(hash_keys));
+
+ if (!flkeys) {
+ skb_flow_dissect_flow_keys(skb, &keys, flag);
+ flkeys = &keys;
+ }
+ hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
+ hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
+ hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
+ hash_keys.ports.src = flkeys->ports.src;
+ hash_keys.ports.dst = flkeys->ports.dst;
+ hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
+ } else {
+ memset(&hash_keys, 0, sizeof(hash_keys));
+ hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
+ hash_keys.addrs.v6addrs.src = fl6->saddr;
+ hash_keys.addrs.v6addrs.dst = fl6->daddr;
+ hash_keys.ports.src = fl6->fl6_sport;
+ hash_keys.ports.dst = fl6->fl6_dport;
+ hash_keys.basic.ip_proto = fl6->flowi6_proto;
+ }
+ break;
+ }
+ mhash = flow_hash_from_keys(&hash_keys);
+
+ return mhash >> 1;
+}
+
+void ip6_route_input(struct sk_buff *skb)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct net *net = dev_net(skb->dev);
+ int flags = RT6_LOOKUP_F_HAS_SADDR;
+ struct ip_tunnel_info *tun_info;
+ struct flowi6 fl6 = {
+ .flowi6_iif = skb->dev->ifindex,
+ .daddr = iph->daddr,
+ .saddr = iph->saddr,
+ .flowlabel = ip6_flowinfo(iph),
+ .flowi6_mark = skb->mark,
+ .flowi6_proto = iph->nexthdr,
+ };
+ struct flow_keys *flkeys = NULL, _flkeys;
+
+ tun_info = skb_tunnel_info(skb);
+ if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
+ fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
+
+ if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
+ flkeys = &_flkeys;
+
+ if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
+ fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
+ skb_dst_drop(skb);
+ skb_dst_set(skb,
+ ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags));
+}
+
+static struct rt6_info *ip6_pol_route_output(struct net *net,
+ struct fib6_table *table,
+ struct flowi6 *fl6,
+ const struct sk_buff *skb,
+ int flags)
+{
+ return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
+}
+
+struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
+ struct flowi6 *fl6, int flags)
+{
+ bool any_src;
+
+ if (rt6_need_strict(&fl6->daddr)) {
+ struct dst_entry *dst;
+
+ dst = l3mdev_link_scope_lookup(net, fl6);
+ if (dst)
+ return dst;
+ }
+
+ fl6->flowi6_iif = LOOPBACK_IFINDEX;
+
+ any_src = ipv6_addr_any(&fl6->saddr);
+ if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
+ (fl6->flowi6_oif && any_src))
+ flags |= RT6_LOOKUP_F_IFACE;
+
+ if (!any_src)
+ flags |= RT6_LOOKUP_F_HAS_SADDR;
+ else if (sk)
+ flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
+
+ return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
+}
+EXPORT_SYMBOL_GPL(ip6_route_output_flags);
+
+struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
+{
+ struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
+ struct net_device *loopback_dev = net->loopback_dev;
+ struct dst_entry *new = NULL;
+
+ rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
+ DST_OBSOLETE_DEAD, 0);
+ if (rt) {
+ rt6_info_init(rt);
+ atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
+
+ new = &rt->dst;
+ new->__use = 1;
+ new->input = dst_discard;
+ new->output = dst_discard_out;
+
+ dst_copy_metrics(new, &ort->dst);
+
+ rt->rt6i_idev = in6_dev_get(loopback_dev);
+ rt->rt6i_gateway = ort->rt6i_gateway;
+ rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
+
+ memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
+#ifdef CONFIG_IPV6_SUBTREES
+ memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
+#endif
+ }
+
+ dst_release(dst_orig);
+ return new ? new : ERR_PTR(-ENOMEM);
+}
+
+/*
+ * Destination cache support functions
+ */
+
+static bool fib6_check(struct fib6_info *f6i, u32 cookie)
+{
+ u32 rt_cookie = 0;
+
+ if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
+ return false;
+
+ if (fib6_check_expired(f6i))
+ return false;
+
+ return true;
+}
+
+static struct dst_entry *rt6_check(struct rt6_info *rt,
+ struct fib6_info *from,
+ u32 cookie)
+{
+ u32 rt_cookie = 0;
+
+ if ((from && !fib6_get_cookie_safe(from, &rt_cookie)) ||
+ rt_cookie != cookie)
+ return NULL;
+
+ if (rt6_check_expired(rt))
+ return NULL;
+
+ return &rt->dst;
+}
+
+static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
+ struct fib6_info *from,
+ u32 cookie)
+{
+ if (!__rt6_check_expired(rt) &&
+ rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
+ fib6_check(from, cookie))
+ return &rt->dst;
+ else
+ return NULL;
+}
+
+static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
+{
+ struct dst_entry *dst_ret;
+ struct fib6_info *from;
+ struct rt6_info *rt;
+
+ rt = container_of(dst, struct rt6_info, dst);
+
+ rcu_read_lock();
+
+ /* All IPV6 dsts are created with ->obsolete set to the value
+ * DST_OBSOLETE_FORCE_CHK which forces validation calls down
+ * into this function always.
+ */
+
+ from = rcu_dereference(rt->from);
+
+ if (from && (rt->rt6i_flags & RTF_PCPU ||
+ unlikely(!list_empty(&rt->rt6i_uncached))))
+ dst_ret = rt6_dst_from_check(rt, from, cookie);
+ else
+ dst_ret = rt6_check(rt, from, cookie);
+
+ rcu_read_unlock();
+
+ return dst_ret;
+}
+
+static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
+{
+ struct rt6_info *rt = (struct rt6_info *) dst;
+
+ if (rt) {
+ if (rt->rt6i_flags & RTF_CACHE) {
+ rcu_read_lock();
+ if (rt6_check_expired(rt)) {
+ rt6_remove_exception_rt(rt);
+ dst = NULL;
+ }
+ rcu_read_unlock();
+ } else {
+ dst_release(dst);
+ dst = NULL;
+ }
+ }
+ return dst;
+}
+
+static void ip6_link_failure(struct sk_buff *skb)
+{
+ struct rt6_info *rt;
+
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
+
+ rt = (struct rt6_info *) skb_dst(skb);
+ if (rt) {
+ rcu_read_lock();
+ if (rt->rt6i_flags & RTF_CACHE) {
+ rt6_remove_exception_rt(rt);
+ } else {
+ struct fib6_info *from;
+ struct fib6_node *fn;
+
+ from = rcu_dereference(rt->from);
+ if (from) {
+ fn = rcu_dereference(from->fib6_node);
+ if (fn && (rt->rt6i_flags & RTF_DEFAULT))
+ fn->fn_sernum = -1;
+ }
+ }
+ rcu_read_unlock();
+ }
+}
+
+static void rt6_update_expires(struct rt6_info *rt0, int timeout)
+{
+ if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
+ struct fib6_info *from;
+
+ rcu_read_lock();
+ from = rcu_dereference(rt0->from);
+ if (from)
+ rt0->dst.expires = from->expires;
+ rcu_read_unlock();
+ }
+
+ dst_set_expires(&rt0->dst, timeout);
+ rt0->rt6i_flags |= RTF_EXPIRES;
+}
+
+static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
+{
+ struct net *net = dev_net(rt->dst.dev);
+
+ dst_metric_set(&rt->dst, RTAX_MTU, mtu);
+ rt->rt6i_flags |= RTF_MODIFIED;
+ rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
+}
+
+static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
+{
+ bool from_set;
+
+ rcu_read_lock();
+ from_set = !!rcu_dereference(rt->from);
+ rcu_read_unlock();
+
+ return !(rt->rt6i_flags & RTF_CACHE) &&
+ (rt->rt6i_flags & RTF_PCPU || from_set);
+}
+
+static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
+ const struct ipv6hdr *iph, u32 mtu)
+{
+ const struct in6_addr *daddr, *saddr;
+ struct rt6_info *rt6 = (struct rt6_info *)dst;
+
+ if (dst_metric_locked(dst, RTAX_MTU))
+ return;
+
+ if (iph) {
+ daddr = &iph->daddr;
+ saddr = &iph->saddr;
+ } else if (sk) {
+ daddr = &sk->sk_v6_daddr;
+ saddr = &inet6_sk(sk)->saddr;
+ } else {
+ daddr = NULL;
+ saddr = NULL;
+ }
+ dst_confirm_neigh(dst, daddr);
+ mtu = max_t(u32, mtu, IPV6_MIN_MTU);
+ if (mtu >= dst_mtu(dst))
+ return;
+
+ if (!rt6_cache_allowed_for_pmtu(rt6)) {
+ rt6_do_update_pmtu(rt6, mtu);
+ /* update rt6_ex->stamp for cache */
+ if (rt6->rt6i_flags & RTF_CACHE)
+ rt6_update_exception_stamp_rt(rt6);
+ } else if (daddr) {
+ struct fib6_info *from;
+ struct rt6_info *nrt6;
+
+ rcu_read_lock();
+ from = rcu_dereference(rt6->from);
+ nrt6 = ip6_rt_cache_alloc(from, daddr, saddr);
+ if (nrt6) {
+ rt6_do_update_pmtu(nrt6, mtu);
+ if (rt6_insert_exception(nrt6, from))
+ dst_release_immediate(&nrt6->dst);
+ }
+ rcu_read_unlock();
+ }
+}
+
+static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb, u32 mtu)
+{
+ __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
+}
+
+void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
+ int oif, u32 mark, kuid_t uid)
+{
+ const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
+ struct dst_entry *dst;
+ struct flowi6 fl6;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_oif = oif;
+ fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
+ fl6.daddr = iph->daddr;
+ fl6.saddr = iph->saddr;
+ fl6.flowlabel = ip6_flowinfo(iph);
+ fl6.flowi6_uid = uid;
+
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (!dst->error)
+ __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
+ dst_release(dst);
+}
+EXPORT_SYMBOL_GPL(ip6_update_pmtu);
+
+void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
+{
+ int oif = sk->sk_bound_dev_if;
+ struct dst_entry *dst;
+
+ if (!oif && skb->dev)
+ oif = l3mdev_master_ifindex(skb->dev);
+
+ ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);
+
+ dst = __sk_dst_get(sk);
+ if (!dst || !dst->obsolete ||
+ dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
+ return;
+
+ bh_lock_sock(sk);
+ if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
+ ip6_datagram_dst_update(sk, false);
+ bh_unlock_sock(sk);
+}
+EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
+
+void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
+ const struct flowi6 *fl6)
+{
+#ifdef CONFIG_IPV6_SUBTREES
+ struct ipv6_pinfo *np = inet6_sk(sk);
+#endif
+
+ ip6_dst_store(sk, dst,
+ ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
+ &sk->sk_v6_daddr : NULL,
+#ifdef CONFIG_IPV6_SUBTREES
+ ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
+ &np->saddr :
+#endif
+ NULL);
+}
+
+/* Handle redirects */
+struct ip6rd_flowi {
+ struct flowi6 fl6;
+ struct in6_addr gateway;
+};
+
+static struct rt6_info *__ip6_route_redirect(struct net *net,
+ struct fib6_table *table,
+ struct flowi6 *fl6,
+ const struct sk_buff *skb,
+ int flags)
+{
+ struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
+ struct rt6_info *ret = NULL, *rt_cache;
+ struct fib6_info *rt;
+ struct fib6_node *fn;
+
+ /* Get the "current" route for this destination and
+ * check if the redirect has come from appropriate router.
+ *
+ * RFC 4861 specifies that redirects should only be
+ * accepted if they come from the nexthop to the target.
+ * Due to the way the routes are chosen, this notion
+ * is a bit fuzzy and one might need to check all possible
+ * routes.
+ */
+
+ rcu_read_lock();
+ fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
+restart:
+ for_each_fib6_node_rt_rcu(fn) {
+ if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
+ continue;
+ if (fib6_check_expired(rt))
+ continue;
+ if (rt->fib6_flags & RTF_REJECT)
+ break;
+ if (!(rt->fib6_flags & RTF_GATEWAY))
+ continue;
+ if (fl6->flowi6_oif != rt->fib6_nh.nh_dev->ifindex)
+ continue;
+ /* rt_cache's gateway might be different from its 'parent'
+ * in the case of an ip redirect.
+ * So we keep searching in the exception table if the gateway
+ * is different.
+ */
+ if (!ipv6_addr_equal(&rdfl->gateway, &rt->fib6_nh.nh_gw)) {
+ rt_cache = rt6_find_cached_rt(rt,
+ &fl6->daddr,
+ &fl6->saddr);
+ if (rt_cache &&
+ ipv6_addr_equal(&rdfl->gateway,
+ &rt_cache->rt6i_gateway)) {
+ ret = rt_cache;
+ break;
+ }
+ continue;
+ }
+ break;
+ }
+
+ if (!rt)
+ rt = net->ipv6.fib6_null_entry;
+ else if (rt->fib6_flags & RTF_REJECT) {
+ ret = net->ipv6.ip6_null_entry;
+ goto out;
+ }
+
+ if (rt == net->ipv6.fib6_null_entry) {
+ fn = fib6_backtrack(fn, &fl6->saddr);
+ if (fn)
+ goto restart;
+ }
+
+out:
+ if (ret)
+ ip6_hold_safe(net, &ret, true);
+ else
+ ret = ip6_create_rt_rcu(rt);
+
+ rcu_read_unlock();
+
+ trace_fib6_table_lookup(net, rt, table, fl6);
+ return ret;
+};
+
+static struct dst_entry *ip6_route_redirect(struct net *net,
+ const struct flowi6 *fl6,
+ const struct sk_buff *skb,
+ const struct in6_addr *gateway)
+{
+ int flags = RT6_LOOKUP_F_HAS_SADDR;
+ struct ip6rd_flowi rdfl;
+
+ rdfl.fl6 = *fl6;
+ rdfl.gateway = *gateway;
+
+ return fib6_rule_lookup(net, &rdfl.fl6, skb,
+ flags, __ip6_route_redirect);
+}
+
+void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
+ kuid_t uid)
+{
+ const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
+ struct dst_entry *dst;
+ struct flowi6 fl6;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_iif = LOOPBACK_IFINDEX;
+ fl6.flowi6_oif = oif;
+ fl6.flowi6_mark = mark;
+ fl6.daddr = iph->daddr;
+ fl6.saddr = iph->saddr;
+ fl6.flowlabel = ip6_flowinfo(iph);
+ fl6.flowi6_uid = uid;
+
+ dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
+ rt6_do_redirect(dst, NULL, skb);
+ dst_release(dst);
+}
+EXPORT_SYMBOL_GPL(ip6_redirect);
+
+void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
+ u32 mark)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
+ struct dst_entry *dst;
+ struct flowi6 fl6;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_iif = LOOPBACK_IFINDEX;
+ fl6.flowi6_oif = oif;
+ fl6.flowi6_mark = mark;
+ fl6.daddr = msg->dest;
+ fl6.saddr = iph->daddr;
+ fl6.flowi6_uid = sock_net_uid(net, NULL);
+
+ dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
+ rt6_do_redirect(dst, NULL, skb);
+ dst_release(dst);
+}
+
+void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
+{
+ ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
+ sk->sk_uid);
+}
+EXPORT_SYMBOL_GPL(ip6_sk_redirect);
+
+static unsigned int ip6_default_advmss(const struct dst_entry *dst)
+{
+ struct net_device *dev = dst->dev;
+ unsigned int mtu = dst_mtu(dst);
+ struct net *net = dev_net(dev);
+
+ mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
+
+ if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
+ mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
+
+ /*
+ * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
+ * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
+ * IPV6_MAXPLEN is also valid and means: "any MSS,
+ * rely only on pmtu discovery"
+ */
+ if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
+ mtu = IPV6_MAXPLEN;
+ return mtu;
+}
+
+static unsigned int ip6_mtu(const struct dst_entry *dst)
+{
+ struct inet6_dev *idev;
+ unsigned int mtu;
+
+ mtu = dst_metric_raw(dst, RTAX_MTU);
+ if (mtu)
+ goto out;
+
+ mtu = IPV6_MIN_MTU;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dst->dev);
+ if (idev)
+ mtu = idev->cnf.mtu6;
+ rcu_read_unlock();
+
+out:
+ mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
+
+ return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
+}
+
+/* MTU selection:
+ * 1. mtu on route is locked - use it
+ * 2. mtu from nexthop exception
+ * 3. mtu from egress device
+ *
+ * based on ip6_dst_mtu_forward and exception logic of
+ * rt6_find_cached_rt; called with rcu_read_lock
+ */
+u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
+ struct in6_addr *saddr)
+{
+ struct rt6_exception_bucket *bucket;
+ struct rt6_exception *rt6_ex;
+ struct in6_addr *src_key;
+ struct inet6_dev *idev;
+ u32 mtu = 0;
+
+ if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
+ mtu = f6i->fib6_pmtu;
+ if (mtu)
+ goto out;
+ }
+
+ src_key = NULL;
+#ifdef CONFIG_IPV6_SUBTREES
+ if (f6i->fib6_src.plen)
+ src_key = saddr;
+#endif
+
+ bucket = rcu_dereference(f6i->rt6i_exception_bucket);
+ rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
+ if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
+ mtu = dst_metric_raw(&rt6_ex->rt6i->dst, RTAX_MTU);
+
+ if (likely(!mtu)) {
+ struct net_device *dev = fib6_info_nh_dev(f6i);
+
+ mtu = IPV6_MIN_MTU;
+ idev = __in6_dev_get(dev);
+ if (idev && idev->cnf.mtu6 > mtu)
+ mtu = idev->cnf.mtu6;
+ }
+
+ mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
+out:
+ return mtu - lwtunnel_headroom(fib6_info_nh_lwt(f6i), mtu);
+}
+
+struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
+ struct flowi6 *fl6)
+{
+ struct dst_entry *dst;
+ struct rt6_info *rt;
+ struct inet6_dev *idev = in6_dev_get(dev);
+ struct net *net = dev_net(dev);
+
+ if (unlikely(!idev))
+ return ERR_PTR(-ENODEV);
+
+ rt = ip6_dst_alloc(net, dev, 0);
+ if (unlikely(!rt)) {
+ in6_dev_put(idev);
+ dst = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ rt->dst.flags |= DST_HOST;
+ rt->dst.input = ip6_input;
+ rt->dst.output = ip6_output;
+ rt->rt6i_gateway = fl6->daddr;
+ rt->rt6i_dst.addr = fl6->daddr;
+ rt->rt6i_dst.plen = 128;
+ rt->rt6i_idev = idev;
+ dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
+
+ /* Add this dst into uncached_list so that rt6_disable_ip() can
+ * do proper release of the net_device
+ */
+ rt6_uncached_list_add(rt);
+ atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
+
+ dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
+
+out:
+ return dst;
+}
+
+static int ip6_dst_gc(struct dst_ops *ops)
+{
+ struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
+ int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
+ int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
+ int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
+ int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
+ unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
+ int entries;
+
+ entries = dst_entries_get_fast(ops);
+ if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
+ entries <= rt_max_size)
+ goto out;
+
+ net->ipv6.ip6_rt_gc_expire++;
+ fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
+ entries = dst_entries_get_slow(ops);
+ if (entries < ops->gc_thresh)
+ net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
+out:
+ net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
+ return entries > rt_max_size;
+}
+
+static int ip6_convert_metrics(struct net *net, struct fib6_info *rt,
+ struct fib6_config *cfg)
+{
+ struct dst_metrics *p;
+
+ if (!cfg->fc_mx)
+ return 0;
+
+ p = kzalloc(sizeof(*rt->fib6_metrics), GFP_KERNEL);
+ if (unlikely(!p))
+ return -ENOMEM;
+
+ refcount_set(&p->refcnt, 1);
+ rt->fib6_metrics = p;
+
+ return ip_metrics_convert(net, cfg->fc_mx, cfg->fc_mx_len, p->metrics);
+}
+
+static struct rt6_info *ip6_nh_lookup_table(struct net *net,
+ struct fib6_config *cfg,
+ const struct in6_addr *gw_addr,
+ u32 tbid, int flags)
+{
+ struct flowi6 fl6 = {
+ .flowi6_oif = cfg->fc_ifindex,
+ .daddr = *gw_addr,
+ .saddr = cfg->fc_prefsrc,
+ };
+ struct fib6_table *table;
+ struct rt6_info *rt;
+
+ table = fib6_get_table(net, tbid);
+ if (!table)
+ return NULL;
+
+ if (!ipv6_addr_any(&cfg->fc_prefsrc))
+ flags |= RT6_LOOKUP_F_HAS_SADDR;
+
+ flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
+ rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, NULL, flags);
+
+ /* if table lookup failed, fall back to full lookup */
+ if (rt == net->ipv6.ip6_null_entry) {
+ ip6_rt_put(rt);
+ rt = NULL;
+ }
+
+ return rt;
+}
+
+static int ip6_route_check_nh_onlink(struct net *net,
+ struct fib6_config *cfg,
+ const struct net_device *dev,
+ struct netlink_ext_ack *extack)
+{
+ u32 tbid = l3mdev_fib_table(dev) ? : RT_TABLE_MAIN;
+ const struct in6_addr *gw_addr = &cfg->fc_gateway;
+ u32 flags = RTF_LOCAL | RTF_ANYCAST | RTF_REJECT;
+ struct rt6_info *grt;
+ int err;
+
+ err = 0;
+ grt = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0);
+ if (grt) {
+ if (!grt->dst.error &&
+ /* ignore match if it is the default route */
+ grt->from && !ipv6_addr_any(&grt->from->fib6_dst.addr) &&
+ (grt->rt6i_flags & flags || dev != grt->dst.dev)) {
+ NL_SET_ERR_MSG(extack,
+ "Nexthop has invalid gateway or device mismatch");
+ err = -EINVAL;
+ }
+
+ ip6_rt_put(grt);
+ }
+
+ return err;
+}
+
+static int ip6_route_check_nh(struct net *net,
+ struct fib6_config *cfg,
+ struct net_device **_dev,
+ struct inet6_dev **idev)
+{
+ const struct in6_addr *gw_addr = &cfg->fc_gateway;
+ struct net_device *dev = _dev ? *_dev : NULL;
+ struct rt6_info *grt = NULL;
+ int err = -EHOSTUNREACH;
+
+ if (cfg->fc_table) {
+ int flags = RT6_LOOKUP_F_IFACE;
+
+ grt = ip6_nh_lookup_table(net, cfg, gw_addr,
+ cfg->fc_table, flags);
+ if (grt) {
+ if (grt->rt6i_flags & RTF_GATEWAY ||
+ (dev && dev != grt->dst.dev)) {
+ ip6_rt_put(grt);
+ grt = NULL;
+ }
+ }
+ }
+
+ if (!grt)
+ grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, NULL, 1);
+
+ if (!grt)
+ goto out;
+
+ if (dev) {
+ if (dev != grt->dst.dev) {
+ ip6_rt_put(grt);
+ goto out;
+ }
+ } else {
+ *_dev = dev = grt->dst.dev;
+ *idev = grt->rt6i_idev;
+ dev_hold(dev);
+ in6_dev_hold(grt->rt6i_idev);
+ }
+
+ if (!(grt->rt6i_flags & RTF_GATEWAY))
+ err = 0;
+
+ ip6_rt_put(grt);
+
+out:
+ return err;
+}
+
+static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
+ struct net_device **_dev, struct inet6_dev **idev,
+ struct netlink_ext_ack *extack)
+{
+ const struct in6_addr *gw_addr = &cfg->fc_gateway;
+ int gwa_type = ipv6_addr_type(gw_addr);
+ bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
+ const struct net_device *dev = *_dev;
+ bool need_addr_check = !dev;
+ int err = -EINVAL;
+
+ /* if gw_addr is local we will fail to detect this in case
+ * address is still TENTATIVE (DAD in progress). rt6_lookup()
+ * will return already-added prefix route via interface that
+ * prefix route was assigned to, which might be non-loopback.
+ */
+ if (dev &&
+ ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
+ NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
+ goto out;
+ }
+
+ if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
+ /* IPv6 strictly inhibits using not link-local
+ * addresses as nexthop address.
+ * Otherwise, router will not able to send redirects.
+ * It is very good, but in some (rare!) circumstances
+ * (SIT, PtP, NBMA NOARP links) it is handy to allow
+ * some exceptions. --ANK
+ * We allow IPv4-mapped nexthops to support RFC4798-type
+ * addressing
+ */
+ if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
+ NL_SET_ERR_MSG(extack, "Invalid gateway address");
+ goto out;
+ }
+
+ if (cfg->fc_flags & RTNH_F_ONLINK)
+ err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
+ else
+ err = ip6_route_check_nh(net, cfg, _dev, idev);
+
+ if (err)
+ goto out;
+ }
+
+ /* reload in case device was changed */
+ dev = *_dev;
+
+ err = -EINVAL;
+ if (!dev) {
+ NL_SET_ERR_MSG(extack, "Egress device not specified");
+ goto out;
+ } else if (dev->flags & IFF_LOOPBACK) {
+ NL_SET_ERR_MSG(extack,
+ "Egress device can not be loopback device for this route");
+ goto out;
+ }
+
+ /* if we did not check gw_addr above, do so now that the
+ * egress device has been resolved.
+ */
+ if (need_addr_check &&
+ ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
+ NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
+ goto out;
+ }
+
+ err = 0;
+out:
+ return err;
+}
+
+static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
+ gfp_t gfp_flags,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = cfg->fc_nlinfo.nl_net;
+ struct fib6_info *rt = NULL;
+ struct net_device *dev = NULL;
+ struct inet6_dev *idev = NULL;
+ struct fib6_table *table;
+ int addr_type;
+ int err = -EINVAL;
+
+ /* RTF_PCPU is an internal flag; can not be set by userspace */
+ if (cfg->fc_flags & RTF_PCPU) {
+ NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
+ goto out;
+ }
+
+ /* RTF_CACHE is an internal flag; can not be set by userspace */
+ if (cfg->fc_flags & RTF_CACHE) {
+ NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
+ goto out;
+ }
+
+ if (cfg->fc_type > RTN_MAX) {
+ NL_SET_ERR_MSG(extack, "Invalid route type");
+ goto out;
+ }
+
+ if (cfg->fc_dst_len > 128) {
+ NL_SET_ERR_MSG(extack, "Invalid prefix length");
+ goto out;
+ }
+ if (cfg->fc_src_len > 128) {
+ NL_SET_ERR_MSG(extack, "Invalid source address length");
+ goto out;
+ }
+#ifndef CONFIG_IPV6_SUBTREES
+ if (cfg->fc_src_len) {
+ NL_SET_ERR_MSG(extack,
+ "Specifying source address requires IPV6_SUBTREES to be enabled");
+ goto out;
+ }
+#endif
+ if (cfg->fc_ifindex) {
+ err = -ENODEV;
+ dev = dev_get_by_index(net, cfg->fc_ifindex);
+ if (!dev)
+ goto out;
+ idev = in6_dev_get(dev);
+ if (!idev)
+ goto out;
+ }
+
+ if (cfg->fc_metric == 0)
+ cfg->fc_metric = IP6_RT_PRIO_USER;
+
+ if (cfg->fc_flags & RTNH_F_ONLINK) {
+ if (!dev) {
+ NL_SET_ERR_MSG(extack,
+ "Nexthop device required for onlink");
+ err = -ENODEV;
+ goto out;
+ }
+
+ if (!(dev->flags & IFF_UP)) {
+ NL_SET_ERR_MSG(extack, "Nexthop device is not up");
+ err = -ENETDOWN;
+ goto out;
+ }
+ }
+
+ err = -ENOBUFS;
+ if (cfg->fc_nlinfo.nlh &&
+ !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
+ table = fib6_get_table(net, cfg->fc_table);
+ if (!table) {
+ pr_warn("NLM_F_CREATE should be specified when creating new route\n");
+ table = fib6_new_table(net, cfg->fc_table);
+ }
+ } else {
+ table = fib6_new_table(net, cfg->fc_table);
+ }
+
+ if (!table)
+ goto out;
+
+ err = -ENOMEM;
+ rt = fib6_info_alloc(gfp_flags);
+ if (!rt)
+ goto out;
+
+ if (cfg->fc_flags & RTF_ADDRCONF)
+ rt->dst_nocount = true;
+
+ err = ip6_convert_metrics(net, rt, cfg);
+ if (err < 0)
+ goto out;
+
+ if (cfg->fc_flags & RTF_EXPIRES)
+ fib6_set_expires(rt, jiffies +
+ clock_t_to_jiffies(cfg->fc_expires));
+ else
+ fib6_clean_expires(rt);
+
+ if (cfg->fc_protocol == RTPROT_UNSPEC)
+ cfg->fc_protocol = RTPROT_BOOT;
+ rt->fib6_protocol = cfg->fc_protocol;
+
+ addr_type = ipv6_addr_type(&cfg->fc_dst);
+
+ if (cfg->fc_encap) {
+ struct lwtunnel_state *lwtstate;
+
+ err = lwtunnel_build_state(cfg->fc_encap_type,
+ cfg->fc_encap, AF_INET6, cfg,
+ &lwtstate, extack);
+ if (err)
+ goto out;
+ rt->fib6_nh.nh_lwtstate = lwtstate_get(lwtstate);
+ }
+
+ ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
+ rt->fib6_dst.plen = cfg->fc_dst_len;
+ if (rt->fib6_dst.plen == 128)
+ rt->dst_host = true;
+
+#ifdef CONFIG_IPV6_SUBTREES
+ ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
+ rt->fib6_src.plen = cfg->fc_src_len;
+#endif
+
+ rt->fib6_metric = cfg->fc_metric;
+ rt->fib6_nh.nh_weight = 1;
+
+ rt->fib6_type = cfg->fc_type;
+
+ /* We cannot add true routes via loopback here,
+ they would result in kernel looping; promote them to reject routes
+ */
+ if ((cfg->fc_flags & RTF_REJECT) ||
+ (dev && (dev->flags & IFF_LOOPBACK) &&
+ !(addr_type & IPV6_ADDR_LOOPBACK) &&
+ !(cfg->fc_flags & RTF_LOCAL))) {
+ /* hold loopback dev/idev if we haven't done so. */
+ if (dev != net->loopback_dev) {
+ if (dev) {
+ dev_put(dev);
+ in6_dev_put(idev);
+ }
+ dev = net->loopback_dev;
+ dev_hold(dev);
+ idev = in6_dev_get(dev);
+ if (!idev) {
+ err = -ENODEV;
+ goto out;
+ }
+ }
+ rt->fib6_flags = RTF_REJECT|RTF_NONEXTHOP;
+ goto install_route;
+ }
+
+ if (cfg->fc_flags & RTF_GATEWAY) {
+ err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
+ if (err)
+ goto out;
+
+ rt->fib6_nh.nh_gw = cfg->fc_gateway;
+ }
+
+ err = -ENODEV;
+ if (!dev)
+ goto out;
+
+ if (idev->cnf.disable_ipv6) {
+ NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
+ err = -EACCES;
+ goto out;
+ }
+
+ if (!(dev->flags & IFF_UP)) {
+ NL_SET_ERR_MSG(extack, "Nexthop device is not up");
+ err = -ENETDOWN;
+ goto out;
+ }
+
+ if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
+ if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
+ NL_SET_ERR_MSG(extack, "Invalid source address");
+ err = -EINVAL;
+ goto out;
+ }
+ rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
+ rt->fib6_prefsrc.plen = 128;
+ } else
+ rt->fib6_prefsrc.plen = 0;
+
+ rt->fib6_flags = cfg->fc_flags;
+
+install_route:
+ if (!(rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
+ !netif_carrier_ok(dev))
+ rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN;
+ rt->fib6_nh.nh_flags |= (cfg->fc_flags & RTNH_F_ONLINK);
+ rt->fib6_nh.nh_dev = dev;
+ rt->fib6_table = table;
+
+ cfg->fc_nlinfo.nl_net = dev_net(dev);
+
+ if (idev)
+ in6_dev_put(idev);
+
+ return rt;
+out:
+ if (dev)
+ dev_put(dev);
+ if (idev)
+ in6_dev_put(idev);
+
+ fib6_info_release(rt);
+ return ERR_PTR(err);
+}
+
+int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
+ struct netlink_ext_ack *extack)
+{
+ struct fib6_info *rt;
+ int err;
+
+ rt = ip6_route_info_create(cfg, gfp_flags, extack);
+ if (IS_ERR(rt))
+ return PTR_ERR(rt);
+
+ err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
+ fib6_info_release(rt);
+
+ return err;
+}
+
+static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
+{
+ struct net *net = info->nl_net;
+ struct fib6_table *table;
+ int err;
+
+ if (rt == net->ipv6.fib6_null_entry) {
+ err = -ENOENT;
+ goto out;
+ }
+
+ table = rt->fib6_table;
+ spin_lock_bh(&table->tb6_lock);
+ err = fib6_del(rt, info);
+ spin_unlock_bh(&table->tb6_lock);
+
+out:
+ fib6_info_release(rt);
+ return err;
+}
+
+int ip6_del_rt(struct net *net, struct fib6_info *rt)
+{
+ struct nl_info info = { .nl_net = net };
+
+ return __ip6_del_rt(rt, &info);
+}
+
+static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
+{
+ struct nl_info *info = &cfg->fc_nlinfo;
+ struct net *net = info->nl_net;
+ struct sk_buff *skb = NULL;
+ struct fib6_table *table;
+ int err = -ENOENT;
+
+ if (rt == net->ipv6.fib6_null_entry)
+ goto out_put;
+ table = rt->fib6_table;
+ spin_lock_bh(&table->tb6_lock);
+
+ if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
+ struct fib6_info *sibling, *next_sibling;
+
+ /* prefer to send a single notification with all hops */
+ skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
+ if (skb) {
+ u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
+
+ if (rt6_fill_node(net, skb, rt, NULL,
+ NULL, NULL, 0, RTM_DELROUTE,
+ info->portid, seq, 0) < 0) {
+ kfree_skb(skb);
+ skb = NULL;
+ } else
+ info->skip_notify = 1;
+ }
+
+ list_for_each_entry_safe(sibling, next_sibling,
+ &rt->fib6_siblings,
+ fib6_siblings) {
+ err = fib6_del(sibling, info);
+ if (err)
+ goto out_unlock;
+ }
+ }
+
+ err = fib6_del(rt, info);
+out_unlock:
+ spin_unlock_bh(&table->tb6_lock);
+out_put:
+ fib6_info_release(rt);
+
+ if (skb) {
+ rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
+ info->nlh, gfp_any());
+ }
+ return err;
+}
+
+static int ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
+{
+ int rc = -ESRCH;
+
+ if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
+ goto out;
+
+ if (cfg->fc_flags & RTF_GATEWAY &&
+ !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
+ goto out;
+
+ rc = rt6_remove_exception_rt(rt);
+out:
+ return rc;
+}
+
+static int ip6_route_del(struct fib6_config *cfg,
+ struct netlink_ext_ack *extack)
+{
+ struct rt6_info *rt_cache;
+ struct fib6_table *table;
+ struct fib6_info *rt;
+ struct fib6_node *fn;
+ int err = -ESRCH;
+
+ table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
+ if (!table) {
+ NL_SET_ERR_MSG(extack, "FIB table does not exist");
+ return err;
+ }
+
+ rcu_read_lock();
+
+ fn = fib6_locate(&table->tb6_root,
+ &cfg->fc_dst, cfg->fc_dst_len,
+ &cfg->fc_src, cfg->fc_src_len,
+ !(cfg->fc_flags & RTF_CACHE));
+
+ if (fn) {
+ for_each_fib6_node_rt_rcu(fn) {
+ if (cfg->fc_flags & RTF_CACHE) {
+ int rc;
+
+ rt_cache = rt6_find_cached_rt(rt, &cfg->fc_dst,
+ &cfg->fc_src);
+ if (rt_cache) {
+ rc = ip6_del_cached_rt(rt_cache, cfg);
+ if (rc != -ESRCH) {
+ rcu_read_unlock();
+ return rc;
+ }
+ }
+ continue;
+ }
+ if (cfg->fc_ifindex &&
+ (!rt->fib6_nh.nh_dev ||
+ rt->fib6_nh.nh_dev->ifindex != cfg->fc_ifindex))
+ continue;
+ if (cfg->fc_flags & RTF_GATEWAY &&
+ !ipv6_addr_equal(&cfg->fc_gateway, &rt->fib6_nh.nh_gw))
+ continue;
+ if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
+ continue;
+ if (cfg->fc_protocol && cfg->fc_protocol != rt->fib6_protocol)
+ continue;
+ if (!fib6_info_hold_safe(rt))
+ continue;
+ rcu_read_unlock();
+
+ /* if gateway was specified only delete the one hop */
+ if (cfg->fc_flags & RTF_GATEWAY)
+ return __ip6_del_rt(rt, &cfg->fc_nlinfo);
+
+ return __ip6_del_rt_siblings(rt, cfg);
+ }
+ }
+ rcu_read_unlock();
+
+ return err;
+}
+
+static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
+{
+ struct netevent_redirect netevent;
+ struct rt6_info *rt, *nrt = NULL;
+ struct ndisc_options ndopts;
+ struct inet6_dev *in6_dev;
+ struct neighbour *neigh;
+ struct fib6_info *from;
+ struct rd_msg *msg;
+ int optlen, on_link;
+ u8 *lladdr;
+
+ optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
+ optlen -= sizeof(*msg);
+
+ if (optlen < 0) {
+ net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
+ return;
+ }
+
+ msg = (struct rd_msg *)icmp6_hdr(skb);
+
+ if (ipv6_addr_is_multicast(&msg->dest)) {
+ net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
+ return;
+ }
+
+ on_link = 0;
+ if (ipv6_addr_equal(&msg->dest, &msg->target)) {
+ on_link = 1;
+ } else if (ipv6_addr_type(&msg->target) !=
+ (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
+ net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
+ return;
+ }
+
+ in6_dev = __in6_dev_get(skb->dev);
+ if (!in6_dev)
+ return;
+ if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
+ return;
+
+ /* RFC2461 8.1:
+ * The IP source address of the Redirect MUST be the same as the current
+ * first-hop router for the specified ICMP Destination Address.
+ */
+
+ if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
+ net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
+ return;
+ }
+
+ lladdr = NULL;
+ if (ndopts.nd_opts_tgt_lladdr) {
+ lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
+ skb->dev);
+ if (!lladdr) {
+ net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
+ return;
+ }
+ }
+
+ rt = (struct rt6_info *) dst;
+ if (rt->rt6i_flags & RTF_REJECT) {
+ net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
+ return;
+ }
+
+ /* Redirect received -> path was valid.
+ * Look, redirects are sent only in response to data packets,
+ * so that this nexthop apparently is reachable. --ANK
+ */
+ dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
+
+ neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
+ if (!neigh)
+ return;
+
+ /*
+ * We have finally decided to accept it.
+ */
+
+ ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE|
+ (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
+ NEIGH_UPDATE_F_ISROUTER)),
+ NDISC_REDIRECT, &ndopts);
+
+ rcu_read_lock();
+ from = rcu_dereference(rt->from);
+ /* This fib6_info_hold() is safe here because we hold reference to rt
+ * and rt already holds reference to fib6_info.
+ */
+ fib6_info_hold(from);
+ rcu_read_unlock();
+
+ nrt = ip6_rt_cache_alloc(from, &msg->dest, NULL);
+ if (!nrt)
+ goto out;
+
+ nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
+ if (on_link)
+ nrt->rt6i_flags &= ~RTF_GATEWAY;
+
+ nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
+
+ /* No need to remove rt from the exception table if rt is
+ * a cached route because rt6_insert_exception() will
+ * takes care of it
+ */
+ if (rt6_insert_exception(nrt, from)) {
+ dst_release_immediate(&nrt->dst);
+ goto out;
+ }
+
+ netevent.old = &rt->dst;
+ netevent.new = &nrt->dst;
+ netevent.daddr = &msg->dest;
+ netevent.neigh = neigh;
+ call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
+
+out:
+ fib6_info_release(from);
+ neigh_release(neigh);
+}
+
+#ifdef CONFIG_IPV6_ROUTE_INFO
+static struct fib6_info *rt6_get_route_info(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ const struct in6_addr *gwaddr,
+ struct net_device *dev)
+{
+ u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
+ int ifindex = dev->ifindex;
+ struct fib6_node *fn;
+ struct fib6_info *rt = NULL;
+ struct fib6_table *table;
+
+ table = fib6_get_table(net, tb_id);
+ if (!table)
+ return NULL;
+
+ rcu_read_lock();
+ fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
+ if (!fn)
+ goto out;
+
+ for_each_fib6_node_rt_rcu(fn) {
+ if (rt->fib6_nh.nh_dev->ifindex != ifindex)
+ continue;
+ if ((rt->fib6_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
+ continue;
+ if (!ipv6_addr_equal(&rt->fib6_nh.nh_gw, gwaddr))
+ continue;
+ if (!fib6_info_hold_safe(rt))
+ continue;
+ break;
+ }
+out:
+ rcu_read_unlock();
+ return rt;
+}
+
+static struct fib6_info *rt6_add_route_info(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ const struct in6_addr *gwaddr,
+ struct net_device *dev,
+ unsigned int pref)
+{
+ struct fib6_config cfg = {
+ .fc_metric = IP6_RT_PRIO_USER,
+ .fc_ifindex = dev->ifindex,
+ .fc_dst_len = prefixlen,
+ .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
+ RTF_UP | RTF_PREF(pref),
+ .fc_protocol = RTPROT_RA,
+ .fc_type = RTN_UNICAST,
+ .fc_nlinfo.portid = 0,
+ .fc_nlinfo.nlh = NULL,
+ .fc_nlinfo.nl_net = net,
+ };
+
+ cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
+ cfg.fc_dst = *prefix;
+ cfg.fc_gateway = *gwaddr;
+
+ /* We should treat it as a default route if prefix length is 0. */
+ if (!prefixlen)
+ cfg.fc_flags |= RTF_DEFAULT;
+
+ ip6_route_add(&cfg, GFP_ATOMIC, NULL);
+
+ return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
+}
+#endif
+
+struct fib6_info *rt6_get_dflt_router(struct net *net,
+ const struct in6_addr *addr,
+ struct net_device *dev)
+{
+ u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
+ struct fib6_info *rt;
+ struct fib6_table *table;
+
+ table = fib6_get_table(net, tb_id);
+ if (!table)
+ return NULL;
+
+ rcu_read_lock();
+ for_each_fib6_node_rt_rcu(&table->tb6_root) {
+ if (dev == rt->fib6_nh.nh_dev &&
+ ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
+ ipv6_addr_equal(&rt->fib6_nh.nh_gw, addr))
+ break;
+ }
+ if (rt && !fib6_info_hold_safe(rt))
+ rt = NULL;
+ rcu_read_unlock();
+ return rt;
+}
+
+struct fib6_info *rt6_add_dflt_router(struct net *net,
+ const struct in6_addr *gwaddr,
+ struct net_device *dev,
+ unsigned int pref)
+{
+ struct fib6_config cfg = {
+ .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
+ .fc_metric = IP6_RT_PRIO_USER,
+ .fc_ifindex = dev->ifindex,
+ .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
+ RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
+ .fc_protocol = RTPROT_RA,
+ .fc_type = RTN_UNICAST,
+ .fc_nlinfo.portid = 0,
+ .fc_nlinfo.nlh = NULL,
+ .fc_nlinfo.nl_net = net,
+ };
+
+ cfg.fc_gateway = *gwaddr;
+
+ if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
+ struct fib6_table *table;
+
+ table = fib6_get_table(dev_net(dev), cfg.fc_table);
+ if (table)
+ table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
+ }
+
+ return rt6_get_dflt_router(net, gwaddr, dev);
+}
+
+static void __rt6_purge_dflt_routers(struct net *net,
+ struct fib6_table *table)
+{
+ struct fib6_info *rt;
+
+restart:
+ rcu_read_lock();
+ for_each_fib6_node_rt_rcu(&table->tb6_root) {
+ struct net_device *dev = fib6_info_nh_dev(rt);
+ struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
+
+ if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
+ (!idev || idev->cnf.accept_ra != 2) &&
+ fib6_info_hold_safe(rt)) {
+ rcu_read_unlock();
+ ip6_del_rt(net, rt);
+ goto restart;
+ }
+ }
+ rcu_read_unlock();
+
+ table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
+}
+
+void rt6_purge_dflt_routers(struct net *net)
+{
+ struct fib6_table *table;
+ struct hlist_head *head;
+ unsigned int h;
+
+ rcu_read_lock();
+
+ for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
+ head = &net->ipv6.fib_table_hash[h];
+ hlist_for_each_entry_rcu(table, head, tb6_hlist) {
+ if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
+ __rt6_purge_dflt_routers(net, table);
+ }
+ }
+
+ rcu_read_unlock();
+}
+
+static void rtmsg_to_fib6_config(struct net *net,
+ struct in6_rtmsg *rtmsg,
+ struct fib6_config *cfg)
+{
+ memset(cfg, 0, sizeof(*cfg));
+
+ cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
+ : RT6_TABLE_MAIN;
+ cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
+ cfg->fc_metric = rtmsg->rtmsg_metric;
+ cfg->fc_expires = rtmsg->rtmsg_info;
+ cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
+ cfg->fc_src_len = rtmsg->rtmsg_src_len;
+ cfg->fc_flags = rtmsg->rtmsg_flags;
+ cfg->fc_type = rtmsg->rtmsg_type;
+
+ cfg->fc_nlinfo.nl_net = net;
+
+ cfg->fc_dst = rtmsg->rtmsg_dst;
+ cfg->fc_src = rtmsg->rtmsg_src;
+ cfg->fc_gateway = rtmsg->rtmsg_gateway;
+}
+
+int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
+{
+ struct fib6_config cfg;
+ struct in6_rtmsg rtmsg;
+ int err;
+
+ switch (cmd) {
+ case SIOCADDRT: /* Add a route */
+ case SIOCDELRT: /* Delete a route */
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+ err = copy_from_user(&rtmsg, arg,
+ sizeof(struct in6_rtmsg));
+ if (err)
+ return -EFAULT;
+
+ rtmsg_to_fib6_config(net, &rtmsg, &cfg);
+
+ rtnl_lock();
+ switch (cmd) {
+ case SIOCADDRT:
+ err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
+ break;
+ case SIOCDELRT:
+ err = ip6_route_del(&cfg, NULL);
+ break;
+ default:
+ err = -EINVAL;
+ }
+ rtnl_unlock();
+
+ return err;
+ }
+
+ return -EINVAL;
+}
+
+/*
+ * Drop the packet on the floor
+ */
+
+static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
+{
+ int type;
+ struct dst_entry *dst = skb_dst(skb);
+ switch (ipstats_mib_noroutes) {
+ case IPSTATS_MIB_INNOROUTES:
+ type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
+ if (type == IPV6_ADDR_ANY) {
+ IP6_INC_STATS(dev_net(dst->dev),
+ __in6_dev_get_safely(skb->dev),
+ IPSTATS_MIB_INADDRERRORS);
+ break;
+ }
+ /* FALLTHROUGH */
+ case IPSTATS_MIB_OUTNOROUTES:
+ IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
+ ipstats_mib_noroutes);
+ break;
+ }
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
+ kfree_skb(skb);
+ return 0;
+}
+
+static int ip6_pkt_discard(struct sk_buff *skb)
+{
+ return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
+}
+
+static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ skb->dev = skb_dst(skb)->dev;
+ return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
+}
+
+static int ip6_pkt_prohibit(struct sk_buff *skb)
+{
+ return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
+}
+
+static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ skb->dev = skb_dst(skb)->dev;
+ return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
+}
+
+/*
+ * Allocate a dst for local (unicast / anycast) address.
+ */
+
+struct fib6_info *addrconf_f6i_alloc(struct net *net,
+ struct inet6_dev *idev,
+ const struct in6_addr *addr,
+ bool anycast, gfp_t gfp_flags)
+{
+ u32 tb_id;
+ struct net_device *dev = idev->dev;
+ struct fib6_info *f6i;
+
+ f6i = fib6_info_alloc(gfp_flags);
+ if (!f6i)
+ return ERR_PTR(-ENOMEM);
+
+ f6i->dst_nocount = true;
+ f6i->dst_host = true;
+ f6i->fib6_protocol = RTPROT_KERNEL;
+ f6i->fib6_flags = RTF_UP | RTF_NONEXTHOP;
+ if (anycast) {
+ f6i->fib6_type = RTN_ANYCAST;
+ f6i->fib6_flags |= RTF_ANYCAST;
+ } else {
+ f6i->fib6_type = RTN_LOCAL;
+ f6i->fib6_flags |= RTF_LOCAL;
+ }
+
+ f6i->fib6_nh.nh_gw = *addr;
+ dev_hold(dev);
+ f6i->fib6_nh.nh_dev = dev;
+ f6i->fib6_dst.addr = *addr;
+ f6i->fib6_dst.plen = 128;
+ tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
+ f6i->fib6_table = fib6_get_table(net, tb_id);
+
+ return f6i;
+}
+
+/* remove deleted ip from prefsrc entries */
+struct arg_dev_net_ip {
+ struct net_device *dev;
+ struct net *net;
+ struct in6_addr *addr;
+};
+
+static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
+{
+ struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
+ struct net *net = ((struct arg_dev_net_ip *)arg)->net;
+ struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
+
+ if (((void *)rt->fib6_nh.nh_dev == dev || !dev) &&
+ rt != net->ipv6.fib6_null_entry &&
+ ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
+ spin_lock_bh(&rt6_exception_lock);
+ /* remove prefsrc entry */
+ rt->fib6_prefsrc.plen = 0;
+ /* need to update cache as well */
+ rt6_exceptions_remove_prefsrc(rt);
+ spin_unlock_bh(&rt6_exception_lock);
+ }
+ return 0;
+}
+
+void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
+{
+ struct net *net = dev_net(ifp->idev->dev);
+ struct arg_dev_net_ip adni = {
+ .dev = ifp->idev->dev,
+ .net = net,
+ .addr = &ifp->addr,
+ };
+ fib6_clean_all(net, fib6_remove_prefsrc, &adni);
+}
+
+#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
+
+/* Remove routers and update dst entries when gateway turn into host. */
+static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
+{
+ struct in6_addr *gateway = (struct in6_addr *)arg;
+
+ if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
+ ipv6_addr_equal(gateway, &rt->fib6_nh.nh_gw)) {
+ return -1;
+ }
+
+ /* Further clean up cached routes in exception table.
+ * This is needed because cached route may have a different
+ * gateway than its 'parent' in the case of an ip redirect.
+ */
+ rt6_exceptions_clean_tohost(rt, gateway);
+
+ return 0;
+}
+
+void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
+{
+ fib6_clean_all(net, fib6_clean_tohost, gateway);
+}
+
+struct arg_netdev_event {
+ const struct net_device *dev;
+ union {
+ unsigned int nh_flags;
+ unsigned long event;
+ };
+};
+
+static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
+{
+ struct fib6_info *iter;
+ struct fib6_node *fn;
+
+ fn = rcu_dereference_protected(rt->fib6_node,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ iter = rcu_dereference_protected(fn->leaf,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ while (iter) {
+ if (iter->fib6_metric == rt->fib6_metric &&
+ rt6_qualify_for_ecmp(iter))
+ return iter;
+ iter = rcu_dereference_protected(iter->fib6_next,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ }
+
+ return NULL;
+}
+
+static bool rt6_is_dead(const struct fib6_info *rt)
+{
+ if (rt->fib6_nh.nh_flags & RTNH_F_DEAD ||
+ (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
+ fib6_ignore_linkdown(rt)))
+ return true;
+
+ return false;
+}
+
+static int rt6_multipath_total_weight(const struct fib6_info *rt)
+{
+ struct fib6_info *iter;
+ int total = 0;
+
+ if (!rt6_is_dead(rt))
+ total += rt->fib6_nh.nh_weight;
+
+ list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
+ if (!rt6_is_dead(iter))
+ total += iter->fib6_nh.nh_weight;
+ }
+
+ return total;
+}
+
+static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
+{
+ int upper_bound = -1;
+
+ if (!rt6_is_dead(rt)) {
+ *weight += rt->fib6_nh.nh_weight;
+ upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
+ total) - 1;
+ }
+ atomic_set(&rt->fib6_nh.nh_upper_bound, upper_bound);
+}
+
+static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
+{
+ struct fib6_info *iter;
+ int weight = 0;
+
+ rt6_upper_bound_set(rt, &weight, total);
+
+ list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
+ rt6_upper_bound_set(iter, &weight, total);
+}
+
+void rt6_multipath_rebalance(struct fib6_info *rt)
+{
+ struct fib6_info *first;
+ int total;
+
+ /* In case the entire multipath route was marked for flushing,
+ * then there is no need to rebalance upon the removal of every
+ * sibling route.
+ */
+ if (!rt->fib6_nsiblings || rt->should_flush)
+ return;
+
+ /* During lookup routes are evaluated in order, so we need to
+ * make sure upper bounds are assigned from the first sibling
+ * onwards.
+ */
+ first = rt6_multipath_first_sibling(rt);
+ if (WARN_ON_ONCE(!first))
+ return;
+
+ total = rt6_multipath_total_weight(first);
+ rt6_multipath_upper_bound_set(first, total);
+}
+
+static int fib6_ifup(struct fib6_info *rt, void *p_arg)
+{
+ const struct arg_netdev_event *arg = p_arg;
+ struct net *net = dev_net(arg->dev);
+
+ if (rt != net->ipv6.fib6_null_entry && rt->fib6_nh.nh_dev == arg->dev) {
+ rt->fib6_nh.nh_flags &= ~arg->nh_flags;
+ fib6_update_sernum_upto_root(net, rt);
+ rt6_multipath_rebalance(rt);
+ }
+
+ return 0;
+}
+
+void rt6_sync_up(struct net_device *dev, unsigned int nh_flags)
+{
+ struct arg_netdev_event arg = {
+ .dev = dev,
+ {
+ .nh_flags = nh_flags,
+ },
+ };
+
+ if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
+ arg.nh_flags |= RTNH_F_LINKDOWN;
+
+ fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
+}
+
+static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
+ const struct net_device *dev)
+{
+ struct fib6_info *iter;
+
+ if (rt->fib6_nh.nh_dev == dev)
+ return true;
+ list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
+ if (iter->fib6_nh.nh_dev == dev)
+ return true;
+
+ return false;
+}
+
+static void rt6_multipath_flush(struct fib6_info *rt)
+{
+ struct fib6_info *iter;
+
+ rt->should_flush = 1;
+ list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
+ iter->should_flush = 1;
+}
+
+static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
+ const struct net_device *down_dev)
+{
+ struct fib6_info *iter;
+ unsigned int dead = 0;
+
+ if (rt->fib6_nh.nh_dev == down_dev ||
+ rt->fib6_nh.nh_flags & RTNH_F_DEAD)
+ dead++;
+ list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
+ if (iter->fib6_nh.nh_dev == down_dev ||
+ iter->fib6_nh.nh_flags & RTNH_F_DEAD)
+ dead++;
+
+ return dead;
+}
+
+static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
+ const struct net_device *dev,
+ unsigned int nh_flags)
+{
+ struct fib6_info *iter;
+
+ if (rt->fib6_nh.nh_dev == dev)
+ rt->fib6_nh.nh_flags |= nh_flags;
+ list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
+ if (iter->fib6_nh.nh_dev == dev)
+ iter->fib6_nh.nh_flags |= nh_flags;
+}
+
+/* called with write lock held for table with rt */
+static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
+{
+ const struct arg_netdev_event *arg = p_arg;
+ const struct net_device *dev = arg->dev;
+ struct net *net = dev_net(dev);
+
+ if (rt == net->ipv6.fib6_null_entry)
+ return 0;
+
+ switch (arg->event) {
+ case NETDEV_UNREGISTER:
+ return rt->fib6_nh.nh_dev == dev ? -1 : 0;
+ case NETDEV_DOWN:
+ if (rt->should_flush)
+ return -1;
+ if (!rt->fib6_nsiblings)
+ return rt->fib6_nh.nh_dev == dev ? -1 : 0;
+ if (rt6_multipath_uses_dev(rt, dev)) {
+ unsigned int count;
+
+ count = rt6_multipath_dead_count(rt, dev);
+ if (rt->fib6_nsiblings + 1 == count) {
+ rt6_multipath_flush(rt);
+ return -1;
+ }
+ rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
+ RTNH_F_LINKDOWN);
+ fib6_update_sernum(net, rt);
+ rt6_multipath_rebalance(rt);
+ }
+ return -2;
+ case NETDEV_CHANGE:
+ if (rt->fib6_nh.nh_dev != dev ||
+ rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
+ break;
+ rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN;
+ rt6_multipath_rebalance(rt);
+ break;
+ }
+
+ return 0;
+}
+
+void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
+{
+ struct arg_netdev_event arg = {
+ .dev = dev,
+ {
+ .event = event,
+ },
+ };
+
+ fib6_clean_all(dev_net(dev), fib6_ifdown, &arg);
+}
+
+void rt6_disable_ip(struct net_device *dev, unsigned long event)
+{
+ rt6_sync_down_dev(dev, event);
+ rt6_uncached_list_flush_dev(dev_net(dev), dev);
+ neigh_ifdown(&nd_tbl, dev);
+}
+
+struct rt6_mtu_change_arg {
+ struct net_device *dev;
+ unsigned int mtu;
+};
+
+static int rt6_mtu_change_route(struct fib6_info *rt, void *p_arg)
+{
+ struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
+ struct inet6_dev *idev;
+
+ /* In IPv6 pmtu discovery is not optional,
+ so that RTAX_MTU lock cannot disable it.
+ We still use this lock to block changes
+ caused by addrconf/ndisc.
+ */
+
+ idev = __in6_dev_get(arg->dev);
+ if (!idev)
+ return 0;
+
+ /* For administrative MTU increase, there is no way to discover
+ IPv6 PMTU increase, so PMTU increase should be updated here.
+ Since RFC 1981 doesn't include administrative MTU increase
+ update PMTU increase is a MUST. (i.e. jumbo frame)
+ */
+ if (rt->fib6_nh.nh_dev == arg->dev &&
+ !fib6_metric_locked(rt, RTAX_MTU)) {
+ u32 mtu = rt->fib6_pmtu;
+
+ if (mtu >= arg->mtu ||
+ (mtu < arg->mtu && mtu == idev->cnf.mtu6))
+ fib6_metric_set(rt, RTAX_MTU, arg->mtu);
+
+ spin_lock_bh(&rt6_exception_lock);
+ rt6_exceptions_update_pmtu(idev, rt, arg->mtu);
+ spin_unlock_bh(&rt6_exception_lock);
+ }
+ return 0;
+}
+
+void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
+{
+ struct rt6_mtu_change_arg arg = {
+ .dev = dev,
+ .mtu = mtu,
+ };
+
+ fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
+}
+
+static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
+ [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
+ [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
+ [RTA_OIF] = { .type = NLA_U32 },
+ [RTA_IIF] = { .type = NLA_U32 },
+ [RTA_PRIORITY] = { .type = NLA_U32 },
+ [RTA_METRICS] = { .type = NLA_NESTED },
+ [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
+ [RTA_PREF] = { .type = NLA_U8 },
+ [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
+ [RTA_ENCAP] = { .type = NLA_NESTED },
+ [RTA_EXPIRES] = { .type = NLA_U32 },
+ [RTA_UID] = { .type = NLA_U32 },
+ [RTA_MARK] = { .type = NLA_U32 },
+ [RTA_TABLE] = { .type = NLA_U32 },
+ [RTA_IP_PROTO] = { .type = NLA_U8 },
+ [RTA_SPORT] = { .type = NLA_U16 },
+ [RTA_DPORT] = { .type = NLA_U16 },
+};
+
+static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct fib6_config *cfg,
+ struct netlink_ext_ack *extack)
+{
+ struct rtmsg *rtm;
+ struct nlattr *tb[RTA_MAX+1];
+ unsigned int pref;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
+ NULL);
+ if (err < 0)
+ goto errout;
+
+ err = -EINVAL;
+ rtm = nlmsg_data(nlh);
+ memset(cfg, 0, sizeof(*cfg));
+
+ cfg->fc_table = rtm->rtm_table;
+ cfg->fc_dst_len = rtm->rtm_dst_len;
+ cfg->fc_src_len = rtm->rtm_src_len;
+ cfg->fc_flags = RTF_UP;
+ cfg->fc_protocol = rtm->rtm_protocol;
+ cfg->fc_type = rtm->rtm_type;
+
+ if (rtm->rtm_type == RTN_UNREACHABLE ||
+ rtm->rtm_type == RTN_BLACKHOLE ||
+ rtm->rtm_type == RTN_PROHIBIT ||
+ rtm->rtm_type == RTN_THROW)
+ cfg->fc_flags |= RTF_REJECT;
+
+ if (rtm->rtm_type == RTN_LOCAL)
+ cfg->fc_flags |= RTF_LOCAL;
+
+ if (rtm->rtm_flags & RTM_F_CLONED)
+ cfg->fc_flags |= RTF_CACHE;
+
+ cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
+
+ cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
+ cfg->fc_nlinfo.nlh = nlh;
+ cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
+
+ if (tb[RTA_GATEWAY]) {
+ cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
+ cfg->fc_flags |= RTF_GATEWAY;
+ }
+
+ if (tb[RTA_DST]) {
+ int plen = (rtm->rtm_dst_len + 7) >> 3;
+
+ if (nla_len(tb[RTA_DST]) < plen)
+ goto errout;
+
+ nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
+ }
+
+ if (tb[RTA_SRC]) {
+ int plen = (rtm->rtm_src_len + 7) >> 3;
+
+ if (nla_len(tb[RTA_SRC]) < plen)
+ goto errout;
+
+ nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
+ }
+
+ if (tb[RTA_PREFSRC])
+ cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
+
+ if (tb[RTA_OIF])
+ cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
+
+ if (tb[RTA_PRIORITY])
+ cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
+
+ if (tb[RTA_METRICS]) {
+ cfg->fc_mx = nla_data(tb[RTA_METRICS]);
+ cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
+ }
+
+ if (tb[RTA_TABLE])
+ cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
+
+ if (tb[RTA_MULTIPATH]) {
+ cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
+ cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
+
+ err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
+ cfg->fc_mp_len, extack);
+ if (err < 0)
+ goto errout;
+ }
+
+ if (tb[RTA_PREF]) {
+ pref = nla_get_u8(tb[RTA_PREF]);
+ if (pref != ICMPV6_ROUTER_PREF_LOW &&
+ pref != ICMPV6_ROUTER_PREF_HIGH)
+ pref = ICMPV6_ROUTER_PREF_MEDIUM;
+ cfg->fc_flags |= RTF_PREF(pref);
+ }
+
+ if (tb[RTA_ENCAP])
+ cfg->fc_encap = tb[RTA_ENCAP];
+
+ if (tb[RTA_ENCAP_TYPE]) {
+ cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
+
+ err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
+ if (err < 0)
+ goto errout;
+ }
+
+ if (tb[RTA_EXPIRES]) {
+ unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
+
+ if (addrconf_finite_timeout(timeout)) {
+ cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
+ cfg->fc_flags |= RTF_EXPIRES;
+ }
+ }
+
+ err = 0;
+errout:
+ return err;
+}
+
+struct rt6_nh {
+ struct fib6_info *fib6_info;
+ struct fib6_config r_cfg;
+ struct list_head next;
+};
+
+static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
+{
+ struct rt6_nh *nh;
+
+ list_for_each_entry(nh, rt6_nh_list, next) {
+ pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n",
+ &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
+ nh->r_cfg.fc_ifindex);
+ }
+}
+
+static int ip6_route_info_append(struct net *net,
+ struct list_head *rt6_nh_list,
+ struct fib6_info *rt,
+ struct fib6_config *r_cfg)
+{
+ struct rt6_nh *nh;
+ int err = -EEXIST;
+
+ list_for_each_entry(nh, rt6_nh_list, next) {
+ /* check if fib6_info already exists */
+ if (rt6_duplicate_nexthop(nh->fib6_info, rt))
+ return err;
+ }
+
+ nh = kzalloc(sizeof(*nh), GFP_KERNEL);
+ if (!nh)
+ return -ENOMEM;
+ nh->fib6_info = rt;
+ memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
+ list_add_tail(&nh->next, rt6_nh_list);
+
+ return 0;
+}
+
+static void ip6_route_mpath_notify(struct fib6_info *rt,
+ struct fib6_info *rt_last,
+ struct nl_info *info,
+ __u16 nlflags)
+{
+ /* if this is an APPEND route, then rt points to the first route
+ * inserted and rt_last points to last route inserted. Userspace
+ * wants a consistent dump of the route which starts at the first
+ * nexthop. Since sibling routes are always added at the end of
+ * the list, find the first sibling of the last route appended
+ */
+ if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
+ rt = list_first_entry(&rt_last->fib6_siblings,
+ struct fib6_info,
+ fib6_siblings);
+ }
+
+ if (rt)
+ inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
+}
+
+static int ip6_route_multipath_add(struct fib6_config *cfg,
+ struct netlink_ext_ack *extack)
+{
+ struct fib6_info *rt_notif = NULL, *rt_last = NULL;
+ struct nl_info *info = &cfg->fc_nlinfo;
+ struct fib6_config r_cfg;
+ struct rtnexthop *rtnh;
+ struct fib6_info *rt;
+ struct rt6_nh *err_nh;
+ struct rt6_nh *nh, *nh_safe;
+ __u16 nlflags;
+ int remaining;
+ int attrlen;
+ int err = 1;
+ int nhn = 0;
+ int replace = (cfg->fc_nlinfo.nlh &&
+ (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
+ LIST_HEAD(rt6_nh_list);
+
+ nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
+ if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
+ nlflags |= NLM_F_APPEND;
+
+ remaining = cfg->fc_mp_len;
+ rtnh = (struct rtnexthop *)cfg->fc_mp;
+
+ /* Parse a Multipath Entry and build a list (rt6_nh_list) of
+ * fib6_info structs per nexthop
+ */
+ while (rtnh_ok(rtnh, remaining)) {
+ memcpy(&r_cfg, cfg, sizeof(*cfg));
+ if (rtnh->rtnh_ifindex)
+ r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
+
+ attrlen = rtnh_attrlen(rtnh);
+ if (attrlen > 0) {
+ struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
+
+ nla = nla_find(attrs, attrlen, RTA_GATEWAY);
+ if (nla) {
+ r_cfg.fc_gateway = nla_get_in6_addr(nla);
+ r_cfg.fc_flags |= RTF_GATEWAY;
+ }
+ r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
+ nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
+ if (nla)
+ r_cfg.fc_encap_type = nla_get_u16(nla);
+ }
+
+ r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
+ rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
+ if (IS_ERR(rt)) {
+ err = PTR_ERR(rt);
+ rt = NULL;
+ goto cleanup;
+ }
+ if (!rt6_qualify_for_ecmp(rt)) {
+ err = -EINVAL;
+ NL_SET_ERR_MSG(extack,
+ "Device only routes can not be added for IPv6 using the multipath API.");
+ fib6_info_release(rt);
+ goto cleanup;
+ }
+
+ rt->fib6_nh.nh_weight = rtnh->rtnh_hops + 1;
+
+ err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
+ rt, &r_cfg);
+ if (err) {
+ fib6_info_release(rt);
+ goto cleanup;
+ }
+
+ rtnh = rtnh_next(rtnh, &remaining);
+ }
+
+ /* for add and replace send one notification with all nexthops.
+ * Skip the notification in fib6_add_rt2node and send one with
+ * the full route when done
+ */
+ info->skip_notify = 1;
+
+ err_nh = NULL;
+ list_for_each_entry(nh, &rt6_nh_list, next) {
+ err = __ip6_ins_rt(nh->fib6_info, info, extack);
+ fib6_info_release(nh->fib6_info);
+
+ if (!err) {
+ /* save reference to last route successfully inserted */
+ rt_last = nh->fib6_info;
+
+ /* save reference to first route for notification */
+ if (!rt_notif)
+ rt_notif = nh->fib6_info;
+ }
+
+ /* nh->fib6_info is used or freed at this point, reset to NULL*/
+ nh->fib6_info = NULL;
+ if (err) {
+ if (replace && nhn)
+ ip6_print_replace_route_err(&rt6_nh_list);
+ err_nh = nh;
+ goto add_errout;
+ }
+
+ /* Because each route is added like a single route we remove
+ * these flags after the first nexthop: if there is a collision,
+ * we have already failed to add the first nexthop:
+ * fib6_add_rt2node() has rejected it; when replacing, old
+ * nexthops have been replaced by first new, the rest should
+ * be added to it.
+ */
+ cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
+ NLM_F_REPLACE);
+ nhn++;
+ }
+
+ /* success ... tell user about new route */
+ ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
+ goto cleanup;
+
+add_errout:
+ /* send notification for routes that were added so that
+ * the delete notifications sent by ip6_route_del are
+ * coherent
+ */
+ if (rt_notif)
+ ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
+
+ /* Delete routes that were already added */
+ list_for_each_entry(nh, &rt6_nh_list, next) {
+ if (err_nh == nh)
+ break;
+ ip6_route_del(&nh->r_cfg, extack);
+ }
+
+cleanup:
+ list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
+ if (nh->fib6_info)
+ fib6_info_release(nh->fib6_info);
+ list_del(&nh->next);
+ kfree(nh);
+ }
+
+ return err;
+}
+
+static int ip6_route_multipath_del(struct fib6_config *cfg,
+ struct netlink_ext_ack *extack)
+{
+ struct fib6_config r_cfg;
+ struct rtnexthop *rtnh;
+ int remaining;
+ int attrlen;
+ int err = 1, last_err = 0;
+
+ remaining = cfg->fc_mp_len;
+ rtnh = (struct rtnexthop *)cfg->fc_mp;
+
+ /* Parse a Multipath Entry */
+ while (rtnh_ok(rtnh, remaining)) {
+ memcpy(&r_cfg, cfg, sizeof(*cfg));
+ if (rtnh->rtnh_ifindex)
+ r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
+
+ attrlen = rtnh_attrlen(rtnh);
+ if (attrlen > 0) {
+ struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
+
+ nla = nla_find(attrs, attrlen, RTA_GATEWAY);
+ if (nla) {
+ nla_memcpy(&r_cfg.fc_gateway, nla, 16);
+ r_cfg.fc_flags |= RTF_GATEWAY;
+ }
+ }
+ err = ip6_route_del(&r_cfg, extack);
+ if (err)
+ last_err = err;
+
+ rtnh = rtnh_next(rtnh, &remaining);
+ }
+
+ return last_err;
+}
+
+static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct fib6_config cfg;
+ int err;
+
+ err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
+ if (err < 0)
+ return err;
+
+ if (cfg.fc_mp)
+ return ip6_route_multipath_del(&cfg, extack);
+ else {
+ cfg.fc_delete_all_nh = 1;
+ return ip6_route_del(&cfg, extack);
+ }
+}
+
+static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct fib6_config cfg;
+ int err;
+
+ err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
+ if (err < 0)
+ return err;
+
+ if (cfg.fc_mp)
+ return ip6_route_multipath_add(&cfg, extack);
+ else
+ return ip6_route_add(&cfg, GFP_KERNEL, extack);
+}
+
+static size_t rt6_nlmsg_size(struct fib6_info *rt)
+{
+ int nexthop_len = 0;
+
+ if (rt->fib6_nsiblings) {
+ nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
+ + NLA_ALIGN(sizeof(struct rtnexthop))
+ + nla_total_size(16) /* RTA_GATEWAY */
+ + lwtunnel_get_encap_size(rt->fib6_nh.nh_lwtstate);
+
+ nexthop_len *= rt->fib6_nsiblings;
+ }
+
+ return NLMSG_ALIGN(sizeof(struct rtmsg))
+ + nla_total_size(16) /* RTA_SRC */
+ + nla_total_size(16) /* RTA_DST */
+ + nla_total_size(16) /* RTA_GATEWAY */
+ + nla_total_size(16) /* RTA_PREFSRC */
+ + nla_total_size(4) /* RTA_TABLE */
+ + nla_total_size(4) /* RTA_IIF */
+ + nla_total_size(4) /* RTA_OIF */
+ + nla_total_size(4) /* RTA_PRIORITY */
+ + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
+ + nla_total_size(sizeof(struct rta_cacheinfo))
+ + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
+ + nla_total_size(1) /* RTA_PREF */
+ + lwtunnel_get_encap_size(rt->fib6_nh.nh_lwtstate)
+ + nexthop_len;
+}
+
+static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt,
+ unsigned int *flags, bool skip_oif)
+{
+ if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
+ *flags |= RTNH_F_DEAD;
+
+ if (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN) {
+ *flags |= RTNH_F_LINKDOWN;
+
+ rcu_read_lock();
+ if (fib6_ignore_linkdown(rt))
+ *flags |= RTNH_F_DEAD;
+ rcu_read_unlock();
+ }
+
+ if (rt->fib6_flags & RTF_GATEWAY) {
+ if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->fib6_nh.nh_gw) < 0)
+ goto nla_put_failure;
+ }
+
+ *flags |= (rt->fib6_nh.nh_flags & RTNH_F_ONLINK);
+ if (rt->fib6_nh.nh_flags & RTNH_F_OFFLOAD)
+ *flags |= RTNH_F_OFFLOAD;
+
+ /* not needed for multipath encoding b/c it has a rtnexthop struct */
+ if (!skip_oif && rt->fib6_nh.nh_dev &&
+ nla_put_u32(skb, RTA_OIF, rt->fib6_nh.nh_dev->ifindex))
+ goto nla_put_failure;
+
+ if (rt->fib6_nh.nh_lwtstate &&
+ lwtunnel_fill_encap(skb, rt->fib6_nh.nh_lwtstate) < 0)
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+/* add multipath next hop */
+static int rt6_add_nexthop(struct sk_buff *skb, struct fib6_info *rt)
+{
+ const struct net_device *dev = rt->fib6_nh.nh_dev;
+ struct rtnexthop *rtnh;
+ unsigned int flags = 0;
+
+ rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
+ if (!rtnh)
+ goto nla_put_failure;
+
+ rtnh->rtnh_hops = rt->fib6_nh.nh_weight - 1;
+ rtnh->rtnh_ifindex = dev ? dev->ifindex : 0;
+
+ if (rt6_nexthop_info(skb, rt, &flags, true) < 0)
+ goto nla_put_failure;
+
+ rtnh->rtnh_flags = flags;
+
+ /* length of rtnetlink header + attributes */
+ rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static int rt6_fill_node(struct net *net, struct sk_buff *skb,
+ struct fib6_info *rt, struct dst_entry *dst,
+ struct in6_addr *dest, struct in6_addr *src,
+ int iif, int type, u32 portid, u32 seq,
+ unsigned int flags)
+{
+ struct rt6_info *rt6 = (struct rt6_info *)dst;
+ struct rt6key *rt6_dst, *rt6_src;
+ u32 *pmetrics, table, rt6_flags;
+ struct nlmsghdr *nlh;
+ struct rtmsg *rtm;
+ long expires = 0;
+
+ nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ if (rt6) {
+ rt6_dst = &rt6->rt6i_dst;
+ rt6_src = &rt6->rt6i_src;
+ rt6_flags = rt6->rt6i_flags;
+ } else {
+ rt6_dst = &rt->fib6_dst;
+ rt6_src = &rt->fib6_src;
+ rt6_flags = rt->fib6_flags;
+ }
+
+ rtm = nlmsg_data(nlh);
+ rtm->rtm_family = AF_INET6;
+ rtm->rtm_dst_len = rt6_dst->plen;
+ rtm->rtm_src_len = rt6_src->plen;
+ rtm->rtm_tos = 0;
+ if (rt->fib6_table)
+ table = rt->fib6_table->tb6_id;
+ else
+ table = RT6_TABLE_UNSPEC;
+ rtm->rtm_table = table;
+ if (nla_put_u32(skb, RTA_TABLE, table))
+ goto nla_put_failure;
+
+ rtm->rtm_type = rt->fib6_type;
+ rtm->rtm_flags = 0;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ rtm->rtm_protocol = rt->fib6_protocol;
+
+ if (rt6_flags & RTF_CACHE)
+ rtm->rtm_flags |= RTM_F_CLONED;
+
+ if (dest) {
+ if (nla_put_in6_addr(skb, RTA_DST, dest))
+ goto nla_put_failure;
+ rtm->rtm_dst_len = 128;
+ } else if (rtm->rtm_dst_len)
+ if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
+ goto nla_put_failure;
+#ifdef CONFIG_IPV6_SUBTREES
+ if (src) {
+ if (nla_put_in6_addr(skb, RTA_SRC, src))
+ goto nla_put_failure;
+ rtm->rtm_src_len = 128;
+ } else if (rtm->rtm_src_len &&
+ nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
+ goto nla_put_failure;
+#endif
+ if (iif) {
+#ifdef CONFIG_IPV6_MROUTE
+ if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
+ int err = ip6mr_get_route(net, skb, rtm, portid);
+
+ if (err == 0)
+ return 0;
+ if (err < 0)
+ goto nla_put_failure;
+ } else
+#endif
+ if (nla_put_u32(skb, RTA_IIF, iif))
+ goto nla_put_failure;
+ } else if (dest) {
+ struct in6_addr saddr_buf;
+ if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
+ nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
+ goto nla_put_failure;
+ }
+
+ if (rt->fib6_prefsrc.plen) {
+ struct in6_addr saddr_buf;
+ saddr_buf = rt->fib6_prefsrc.addr;
+ if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
+ goto nla_put_failure;
+ }
+
+ pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
+ if (rtnetlink_put_metrics(skb, pmetrics) < 0)
+ goto nla_put_failure;
+
+ if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
+ goto nla_put_failure;
+
+ /* For multipath routes, walk the siblings list and add
+ * each as a nexthop within RTA_MULTIPATH.
+ */
+ if (rt6) {
+ if (rt6_flags & RTF_GATEWAY &&
+ nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
+ goto nla_put_failure;
+
+ if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
+ goto nla_put_failure;
+ } else if (rt->fib6_nsiblings) {
+ struct fib6_info *sibling, *next_sibling;
+ struct nlattr *mp;
+
+ mp = nla_nest_start(skb, RTA_MULTIPATH);
+ if (!mp)
+ goto nla_put_failure;
+
+ if (rt6_add_nexthop(skb, rt) < 0)
+ goto nla_put_failure;
+
+ list_for_each_entry_safe(sibling, next_sibling,
+ &rt->fib6_siblings, fib6_siblings) {
+ if (rt6_add_nexthop(skb, sibling) < 0)
+ goto nla_put_failure;
+ }
+
+ nla_nest_end(skb, mp);
+ } else {
+ if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0)
+ goto nla_put_failure;
+ }
+
+ if (rt6_flags & RTF_EXPIRES) {
+ expires = dst ? dst->expires : rt->expires;
+ expires -= jiffies;
+ }
+
+ if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
+ goto nla_put_failure;
+
+ if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
+ goto nla_put_failure;
+
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+int rt6_dump_route(struct fib6_info *rt, void *p_arg)
+{
+ struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
+ struct net *net = arg->net;
+
+ if (rt == net->ipv6.fib6_null_entry)
+ return 0;
+
+ if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
+ struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
+
+ /* user wants prefix routes only */
+ if (rtm->rtm_flags & RTM_F_PREFIX &&
+ !(rt->fib6_flags & RTF_PREFIX_RT)) {
+ /* success since this is not a prefix route */
+ return 1;
+ }
+ }
+
+ return rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, 0,
+ RTM_NEWROUTE, NETLINK_CB(arg->cb->skb).portid,
+ arg->cb->nlh->nlmsg_seq, NLM_F_MULTI);
+}
+
+static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct nlattr *tb[RTA_MAX+1];
+ int err, iif = 0, oif = 0;
+ struct fib6_info *from;
+ struct dst_entry *dst;
+ struct rt6_info *rt;
+ struct sk_buff *skb;
+ struct rtmsg *rtm;
+ struct flowi6 fl6;
+ bool fibmatch;
+
+ err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
+ extack);
+ if (err < 0)
+ goto errout;
+
+ err = -EINVAL;
+ memset(&fl6, 0, sizeof(fl6));
+ rtm = nlmsg_data(nlh);
+ fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
+ fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
+
+ if (tb[RTA_SRC]) {
+ if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
+ goto errout;
+
+ fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
+ }
+
+ if (tb[RTA_DST]) {
+ if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
+ goto errout;
+
+ fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
+ }
+
+ if (tb[RTA_IIF])
+ iif = nla_get_u32(tb[RTA_IIF]);
+
+ if (tb[RTA_OIF])
+ oif = nla_get_u32(tb[RTA_OIF]);
+
+ if (tb[RTA_MARK])
+ fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
+
+ if (tb[RTA_UID])
+ fl6.flowi6_uid = make_kuid(current_user_ns(),
+ nla_get_u32(tb[RTA_UID]));
+ else
+ fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
+
+ if (tb[RTA_SPORT])
+ fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
+
+ if (tb[RTA_DPORT])
+ fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
+
+ if (tb[RTA_IP_PROTO]) {
+ err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
+ &fl6.flowi6_proto, extack);
+ if (err)
+ goto errout;
+ }
+
+ if (iif) {
+ struct net_device *dev;
+ int flags = 0;
+
+ rcu_read_lock();
+
+ dev = dev_get_by_index_rcu(net, iif);
+ if (!dev) {
+ rcu_read_unlock();
+ err = -ENODEV;
+ goto errout;
+ }
+
+ fl6.flowi6_iif = iif;
+
+ if (!ipv6_addr_any(&fl6.saddr))
+ flags |= RT6_LOOKUP_F_HAS_SADDR;
+
+ dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
+
+ rcu_read_unlock();
+ } else {
+ fl6.flowi6_oif = oif;
+
+ dst = ip6_route_output(net, NULL, &fl6);
+ }
+
+
+ rt = container_of(dst, struct rt6_info, dst);
+ if (rt->dst.error) {
+ err = rt->dst.error;
+ ip6_rt_put(rt);
+ goto errout;
+ }
+
+ if (rt == net->ipv6.ip6_null_entry) {
+ err = rt->dst.error;
+ ip6_rt_put(rt);
+ goto errout;
+ }
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!skb) {
+ ip6_rt_put(rt);
+ err = -ENOBUFS;
+ goto errout;
+ }
+
+ skb_dst_set(skb, &rt->dst);
+
+ rcu_read_lock();
+ from = rcu_dereference(rt->from);
+
+ if (fibmatch)
+ err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, iif,
+ RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, 0);
+ else
+ err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
+ &fl6.saddr, iif, RTM_NEWROUTE,
+ NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
+ 0);
+ rcu_read_unlock();
+
+ if (err < 0) {
+ kfree_skb(skb);
+ goto errout;
+ }
+
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+errout:
+ return err;
+}
+
+void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
+ unsigned int nlm_flags)
+{
+ struct sk_buff *skb;
+ struct net *net = info->nl_net;
+ u32 seq;
+ int err;
+
+ err = -ENOBUFS;
+ seq = info->nlh ? info->nlh->nlmsg_seq : 0;
+
+ skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
+ if (!skb)
+ goto errout;
+
+ err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
+ event, info->portid, seq, nlm_flags);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
+ info->nlh, gfp_any());
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
+}
+
+static int ip6_route_dev_notify(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct net *net = dev_net(dev);
+
+ if (!(dev->flags & IFF_LOOPBACK))
+ return NOTIFY_OK;
+
+ if (event == NETDEV_REGISTER) {
+ net->ipv6.fib6_null_entry->fib6_nh.nh_dev = dev;
+ net->ipv6.ip6_null_entry->dst.dev = dev;
+ net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ net->ipv6.ip6_prohibit_entry->dst.dev = dev;
+ net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
+ net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
+ net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
+#endif
+ } else if (event == NETDEV_UNREGISTER &&
+ dev->reg_state != NETREG_UNREGISTERED) {
+ /* NETDEV_UNREGISTER could be fired for multiple times by
+ * netdev_wait_allrefs(). Make sure we only call this once.
+ */
+ in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
+ in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
+#endif
+ }
+
+ return NOTIFY_OK;
+}
+
+/*
+ * /proc
+ */
+
+#ifdef CONFIG_PROC_FS
+static int rt6_stats_seq_show(struct seq_file *seq, void *v)
+{
+ struct net *net = (struct net *)seq->private;
+ seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
+ net->ipv6.rt6_stats->fib_nodes,
+ net->ipv6.rt6_stats->fib_route_nodes,
+ atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
+ net->ipv6.rt6_stats->fib_rt_entries,
+ net->ipv6.rt6_stats->fib_rt_cache,
+ dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
+ net->ipv6.rt6_stats->fib_discarded_routes);
+
+ return 0;
+}
+#endif /* CONFIG_PROC_FS */
+
+#ifdef CONFIG_SYSCTL
+
+static
+int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct net *net;
+ int delay;
+ if (!write)
+ return -EINVAL;
+
+ net = (struct net *)ctl->extra1;
+ delay = net->ipv6.sysctl.flush_delay;
+ proc_dointvec(ctl, write, buffer, lenp, ppos);
+ fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
+ return 0;
+}
+
+struct ctl_table ipv6_route_table_template[] = {
+ {
+ .procname = "flush",
+ .data = &init_net.ipv6.sysctl.flush_delay,
+ .maxlen = sizeof(int),
+ .mode = 0200,
+ .proc_handler = ipv6_sysctl_rtcache_flush
+ },
+ {
+ .procname = "gc_thresh",
+ .data = &ip6_dst_ops_template.gc_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "max_size",
+ .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "gc_min_interval",
+ .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "gc_timeout",
+ .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "gc_interval",
+ .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "gc_elasticity",
+ .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "mtu_expires",
+ .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "min_adv_mss",
+ .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "gc_min_interval_ms",
+ .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ },
+ { }
+};
+
+struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
+{
+ struct ctl_table *table;
+
+ table = kmemdup(ipv6_route_table_template,
+ sizeof(ipv6_route_table_template),
+ GFP_KERNEL);
+
+ if (table) {
+ table[0].data = &net->ipv6.sysctl.flush_delay;
+ table[0].extra1 = net;
+ table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
+ table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
+ table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
+ table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
+ table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
+ table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
+ table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
+ table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
+ table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
+
+ /* Don't export sysctls to unprivileged users */
+ if (net->user_ns != &init_user_ns)
+ table[0].procname = NULL;
+ }
+
+ return table;
+}
+#endif
+
+static int __net_init ip6_route_net_init(struct net *net)
+{
+ int ret = -ENOMEM;
+
+ memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
+ sizeof(net->ipv6.ip6_dst_ops));
+
+ if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
+ goto out_ip6_dst_ops;
+
+ net->ipv6.fib6_null_entry = kmemdup(&fib6_null_entry_template,
+ sizeof(*net->ipv6.fib6_null_entry),
+ GFP_KERNEL);
+ if (!net->ipv6.fib6_null_entry)
+ goto out_ip6_dst_entries;
+
+ net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
+ sizeof(*net->ipv6.ip6_null_entry),
+ GFP_KERNEL);
+ if (!net->ipv6.ip6_null_entry)
+ goto out_fib6_null_entry;
+ net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
+ dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
+ ip6_template_metrics, true);
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ net->ipv6.fib6_has_custom_rules = false;
+ net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
+ sizeof(*net->ipv6.ip6_prohibit_entry),
+ GFP_KERNEL);
+ if (!net->ipv6.ip6_prohibit_entry)
+ goto out_ip6_null_entry;
+ net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
+ dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
+ ip6_template_metrics, true);
+
+ net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
+ sizeof(*net->ipv6.ip6_blk_hole_entry),
+ GFP_KERNEL);
+ if (!net->ipv6.ip6_blk_hole_entry)
+ goto out_ip6_prohibit_entry;
+ net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
+ dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
+ ip6_template_metrics, true);
+#endif
+
+ net->ipv6.sysctl.flush_delay = 0;
+ net->ipv6.sysctl.ip6_rt_max_size = 4096;
+ net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
+ net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
+ net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
+ net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
+ net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
+ net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
+
+ net->ipv6.ip6_rt_gc_expire = 30*HZ;
+
+ ret = 0;
+out:
+ return ret;
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+out_ip6_prohibit_entry:
+ kfree(net->ipv6.ip6_prohibit_entry);
+out_ip6_null_entry:
+ kfree(net->ipv6.ip6_null_entry);
+#endif
+out_fib6_null_entry:
+ kfree(net->ipv6.fib6_null_entry);
+out_ip6_dst_entries:
+ dst_entries_destroy(&net->ipv6.ip6_dst_ops);
+out_ip6_dst_ops:
+ goto out;
+}
+
+static void __net_exit ip6_route_net_exit(struct net *net)
+{
+ kfree(net->ipv6.fib6_null_entry);
+ kfree(net->ipv6.ip6_null_entry);
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ kfree(net->ipv6.ip6_prohibit_entry);
+ kfree(net->ipv6.ip6_blk_hole_entry);
+#endif
+ dst_entries_destroy(&net->ipv6.ip6_dst_ops);
+}
+
+static int __net_init ip6_route_net_init_late(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
+ sizeof(struct ipv6_route_iter));
+ proc_create_net_single("rt6_stats", 0444, net->proc_net,
+ rt6_stats_seq_show, NULL);
+#endif
+ return 0;
+}
+
+static void __net_exit ip6_route_net_exit_late(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ remove_proc_entry("ipv6_route", net->proc_net);
+ remove_proc_entry("rt6_stats", net->proc_net);
+#endif
+}
+
+static struct pernet_operations ip6_route_net_ops = {
+ .init = ip6_route_net_init,
+ .exit = ip6_route_net_exit,
+};
+
+static int __net_init ipv6_inetpeer_init(struct net *net)
+{
+ struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
+
+ if (!bp)
+ return -ENOMEM;
+ inet_peer_base_init(bp);
+ net->ipv6.peers = bp;
+ return 0;
+}
+
+static void __net_exit ipv6_inetpeer_exit(struct net *net)
+{
+ struct inet_peer_base *bp = net->ipv6.peers;
+
+ net->ipv6.peers = NULL;
+ inetpeer_invalidate_tree(bp);
+ kfree(bp);
+}
+
+static struct pernet_operations ipv6_inetpeer_ops = {
+ .init = ipv6_inetpeer_init,
+ .exit = ipv6_inetpeer_exit,
+};
+
+static struct pernet_operations ip6_route_net_late_ops = {
+ .init = ip6_route_net_init_late,
+ .exit = ip6_route_net_exit_late,
+};
+
+static struct notifier_block ip6_route_dev_notifier = {
+ .notifier_call = ip6_route_dev_notify,
+ .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
+};
+
+void __init ip6_route_init_special_entries(void)
+{
+ /* Registering of the loopback is done before this portion of code,
+ * the loopback reference in rt6_info will not be taken, do it
+ * manually for init_net */
+ init_net.ipv6.fib6_null_entry->fib6_nh.nh_dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+ #ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+ init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+ #endif
+}
+
+int __init ip6_route_init(void)
+{
+ int ret;
+ int cpu;
+
+ ret = -ENOMEM;
+ ip6_dst_ops_template.kmem_cachep =
+ kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!ip6_dst_ops_template.kmem_cachep)
+ goto out;
+
+ ret = dst_entries_init(&ip6_dst_blackhole_ops);
+ if (ret)
+ goto out_kmem_cache;
+
+ ret = register_pernet_subsys(&ipv6_inetpeer_ops);
+ if (ret)
+ goto out_dst_entries;
+
+ ret = register_pernet_subsys(&ip6_route_net_ops);
+ if (ret)
+ goto out_register_inetpeer;
+
+ ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
+
+ ret = fib6_init();
+ if (ret)
+ goto out_register_subsys;
+
+ ret = xfrm6_init();
+ if (ret)
+ goto out_fib6_init;
+
+ ret = fib6_rules_init();
+ if (ret)
+ goto xfrm6_init;
+
+ ret = register_pernet_subsys(&ip6_route_net_late_ops);
+ if (ret)
+ goto fib6_rules_init;
+
+ ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
+ inet6_rtm_newroute, NULL, 0);
+ if (ret < 0)
+ goto out_register_late_subsys;
+
+ ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
+ inet6_rtm_delroute, NULL, 0);
+ if (ret < 0)
+ goto out_register_late_subsys;
+
+ ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
+ inet6_rtm_getroute, NULL,
+ RTNL_FLAG_DOIT_UNLOCKED);
+ if (ret < 0)
+ goto out_register_late_subsys;
+
+ ret = register_netdevice_notifier(&ip6_route_dev_notifier);
+ if (ret)
+ goto out_register_late_subsys;
+
+ for_each_possible_cpu(cpu) {
+ struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
+
+ INIT_LIST_HEAD(&ul->head);
+ spin_lock_init(&ul->lock);
+ }
+
+out:
+ return ret;
+
+out_register_late_subsys:
+ rtnl_unregister_all(PF_INET6);
+ unregister_pernet_subsys(&ip6_route_net_late_ops);
+fib6_rules_init:
+ fib6_rules_cleanup();
+xfrm6_init:
+ xfrm6_fini();
+out_fib6_init:
+ fib6_gc_cleanup();
+out_register_subsys:
+ unregister_pernet_subsys(&ip6_route_net_ops);
+out_register_inetpeer:
+ unregister_pernet_subsys(&ipv6_inetpeer_ops);
+out_dst_entries:
+ dst_entries_destroy(&ip6_dst_blackhole_ops);
+out_kmem_cache:
+ kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
+ goto out;
+}
+
+void ip6_route_cleanup(void)
+{
+ unregister_netdevice_notifier(&ip6_route_dev_notifier);
+ unregister_pernet_subsys(&ip6_route_net_late_ops);
+ fib6_rules_cleanup();
+ xfrm6_fini();
+ fib6_gc_cleanup();
+ unregister_pernet_subsys(&ipv6_inetpeer_ops);
+ unregister_pernet_subsys(&ip6_route_net_ops);
+ dst_entries_destroy(&ip6_dst_blackhole_ops);
+ kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
+}
diff --git a/net/ipv6/seg6.c b/net/ipv6/seg6.c
new file mode 100644
index 0000000..8d0ba75
--- /dev/null
+++ b/net/ipv6/seg6.c
@@ -0,0 +1,499 @@
+/*
+ * SR-IPv6 implementation
+ *
+ * Author:
+ * David Lebrun <david.lebrun@uclouvain.be>
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/slab.h>
+#include <linux/rhashtable.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+
+#include <net/seg6.h>
+#include <net/genetlink.h>
+#include <linux/seg6.h>
+#include <linux/seg6_genl.h>
+#ifdef CONFIG_IPV6_SEG6_HMAC
+#include <net/seg6_hmac.h>
+#endif
+
+bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
+{
+ int trailing;
+ unsigned int tlv_offset;
+
+ if (srh->type != IPV6_SRCRT_TYPE_4)
+ return false;
+
+ if (((srh->hdrlen + 1) << 3) != len)
+ return false;
+
+ if (srh->segments_left > srh->first_segment)
+ return false;
+
+ tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
+
+ trailing = len - tlv_offset;
+ if (trailing < 0)
+ return false;
+
+ while (trailing) {
+ struct sr6_tlv *tlv;
+ unsigned int tlv_len;
+
+ if (trailing < sizeof(*tlv))
+ return false;
+
+ tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset);
+ tlv_len = sizeof(*tlv) + tlv->len;
+
+ trailing -= tlv_len;
+ if (trailing < 0)
+ return false;
+
+ tlv_offset += tlv_len;
+ }
+
+ return true;
+}
+
+static struct genl_family seg6_genl_family;
+
+static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
+ [SEG6_ATTR_DST] = { .type = NLA_BINARY,
+ .len = sizeof(struct in6_addr) },
+ [SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
+ [SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
+ [SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
+ [SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
+ [SEG6_ATTR_ALGID] = { .type = NLA_U8, },
+ [SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
+};
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+
+static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = genl_info_net(info);
+ struct seg6_pernet_data *sdata;
+ struct seg6_hmac_info *hinfo;
+ u32 hmackeyid;
+ char *secret;
+ int err = 0;
+ u8 algid;
+ u8 slen;
+
+ sdata = seg6_pernet(net);
+
+ if (!info->attrs[SEG6_ATTR_HMACKEYID] ||
+ !info->attrs[SEG6_ATTR_SECRETLEN] ||
+ !info->attrs[SEG6_ATTR_ALGID])
+ return -EINVAL;
+
+ hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
+ slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
+ algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
+
+ if (hmackeyid == 0)
+ return -EINVAL;
+
+ if (slen > SEG6_HMAC_SECRET_LEN)
+ return -EINVAL;
+
+ mutex_lock(&sdata->lock);
+ hinfo = seg6_hmac_info_lookup(net, hmackeyid);
+
+ if (!slen) {
+ if (!hinfo)
+ err = -ENOENT;
+
+ err = seg6_hmac_info_del(net, hmackeyid);
+
+ goto out_unlock;
+ }
+
+ if (!info->attrs[SEG6_ATTR_SECRET]) {
+ err = -EINVAL;
+ goto out_unlock;
+ }
+
+ if (hinfo) {
+ err = seg6_hmac_info_del(net, hmackeyid);
+ if (err)
+ goto out_unlock;
+ }
+
+ secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
+
+ hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
+ if (!hinfo) {
+ err = -ENOMEM;
+ goto out_unlock;
+ }
+
+ memcpy(hinfo->secret, secret, slen);
+ hinfo->slen = slen;
+ hinfo->alg_id = algid;
+ hinfo->hmackeyid = hmackeyid;
+
+ err = seg6_hmac_info_add(net, hmackeyid, hinfo);
+ if (err)
+ kfree(hinfo);
+
+out_unlock:
+ mutex_unlock(&sdata->lock);
+ return err;
+}
+
+#else
+
+static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
+{
+ return -ENOTSUPP;
+}
+
+#endif
+
+static int seg6_genl_set_tunsrc(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = genl_info_net(info);
+ struct in6_addr *val, *t_old, *t_new;
+ struct seg6_pernet_data *sdata;
+
+ sdata = seg6_pernet(net);
+
+ if (!info->attrs[SEG6_ATTR_DST])
+ return -EINVAL;
+
+ val = nla_data(info->attrs[SEG6_ATTR_DST]);
+ t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
+ if (!t_new)
+ return -ENOMEM;
+
+ mutex_lock(&sdata->lock);
+
+ t_old = sdata->tun_src;
+ rcu_assign_pointer(sdata->tun_src, t_new);
+
+ mutex_unlock(&sdata->lock);
+
+ synchronize_net();
+ kfree(t_old);
+
+ return 0;
+}
+
+static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = genl_info_net(info);
+ struct in6_addr *tun_src;
+ struct sk_buff *msg;
+ void *hdr;
+
+ msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
+ &seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
+ if (!hdr)
+ goto free_msg;
+
+ rcu_read_lock();
+ tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
+
+ if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
+ goto nla_put_failure;
+
+ rcu_read_unlock();
+
+ genlmsg_end(msg, hdr);
+ genlmsg_reply(msg, info);
+
+ return 0;
+
+nla_put_failure:
+ rcu_read_unlock();
+free_msg:
+ nlmsg_free(msg);
+ return -ENOMEM;
+}
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+
+static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
+ struct sk_buff *msg)
+{
+ if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) ||
+ nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) ||
+ nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) ||
+ nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
+ return -1;
+
+ return 0;
+}
+
+static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
+ u32 portid, u32 seq, u32 flags,
+ struct sk_buff *skb, u8 cmd)
+{
+ void *hdr;
+
+ hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
+ if (!hdr)
+ return -ENOMEM;
+
+ if (__seg6_hmac_fill_info(hinfo, skb) < 0)
+ goto nla_put_failure;
+
+ genlmsg_end(skb, hdr);
+ return 0;
+
+nla_put_failure:
+ genlmsg_cancel(skb, hdr);
+ return -EMSGSIZE;
+}
+
+static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
+{
+ struct net *net = sock_net(cb->skb->sk);
+ struct seg6_pernet_data *sdata;
+ struct rhashtable_iter *iter;
+
+ sdata = seg6_pernet(net);
+ iter = (struct rhashtable_iter *)cb->args[0];
+
+ if (!iter) {
+ iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+ if (!iter)
+ return -ENOMEM;
+
+ cb->args[0] = (long)iter;
+ }
+
+ rhashtable_walk_enter(&sdata->hmac_infos, iter);
+
+ return 0;
+}
+
+static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
+{
+ struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
+
+ rhashtable_walk_exit(iter);
+
+ kfree(iter);
+
+ return 0;
+}
+
+static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
+ struct seg6_hmac_info *hinfo;
+ int ret;
+
+ rhashtable_walk_start(iter);
+
+ for (;;) {
+ hinfo = rhashtable_walk_next(iter);
+
+ if (IS_ERR(hinfo)) {
+ if (PTR_ERR(hinfo) == -EAGAIN)
+ continue;
+ ret = PTR_ERR(hinfo);
+ goto done;
+ } else if (!hinfo) {
+ break;
+ }
+
+ ret = __seg6_genl_dumphmac_element(hinfo,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ NLM_F_MULTI,
+ skb, SEG6_CMD_DUMPHMAC);
+ if (ret)
+ goto done;
+ }
+
+ ret = skb->len;
+
+done:
+ rhashtable_walk_stop(iter);
+ return ret;
+}
+
+#else
+
+static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
+{
+ return 0;
+}
+
+static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
+{
+ return 0;
+}
+
+static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ return -ENOTSUPP;
+}
+
+#endif
+
+static int __net_init seg6_net_init(struct net *net)
+{
+ struct seg6_pernet_data *sdata;
+
+ sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
+ if (!sdata)
+ return -ENOMEM;
+
+ mutex_init(&sdata->lock);
+
+ sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
+ if (!sdata->tun_src) {
+ kfree(sdata);
+ return -ENOMEM;
+ }
+
+ net->ipv6.seg6_data = sdata;
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ seg6_hmac_net_init(net);
+#endif
+
+ return 0;
+}
+
+static void __net_exit seg6_net_exit(struct net *net)
+{
+ struct seg6_pernet_data *sdata = seg6_pernet(net);
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ seg6_hmac_net_exit(net);
+#endif
+
+ kfree(sdata->tun_src);
+ kfree(sdata);
+}
+
+static struct pernet_operations ip6_segments_ops = {
+ .init = seg6_net_init,
+ .exit = seg6_net_exit,
+};
+
+static const struct genl_ops seg6_genl_ops[] = {
+ {
+ .cmd = SEG6_CMD_SETHMAC,
+ .doit = seg6_genl_sethmac,
+ .policy = seg6_genl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = SEG6_CMD_DUMPHMAC,
+ .start = seg6_genl_dumphmac_start,
+ .dumpit = seg6_genl_dumphmac,
+ .done = seg6_genl_dumphmac_done,
+ .policy = seg6_genl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = SEG6_CMD_SET_TUNSRC,
+ .doit = seg6_genl_set_tunsrc,
+ .policy = seg6_genl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = SEG6_CMD_GET_TUNSRC,
+ .doit = seg6_genl_get_tunsrc,
+ .policy = seg6_genl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+};
+
+static struct genl_family seg6_genl_family __ro_after_init = {
+ .hdrsize = 0,
+ .name = SEG6_GENL_NAME,
+ .version = SEG6_GENL_VERSION,
+ .maxattr = SEG6_ATTR_MAX,
+ .netnsok = true,
+ .parallel_ops = true,
+ .ops = seg6_genl_ops,
+ .n_ops = ARRAY_SIZE(seg6_genl_ops),
+ .module = THIS_MODULE,
+};
+
+int __init seg6_init(void)
+{
+ int err = -ENOMEM;
+
+ err = genl_register_family(&seg6_genl_family);
+ if (err)
+ goto out;
+
+ err = register_pernet_subsys(&ip6_segments_ops);
+ if (err)
+ goto out_unregister_genl;
+
+#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
+ err = seg6_iptunnel_init();
+ if (err)
+ goto out_unregister_pernet;
+
+ err = seg6_local_init();
+ if (err)
+ goto out_unregister_pernet;
+#endif
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ err = seg6_hmac_init();
+ if (err)
+ goto out_unregister_iptun;
+#endif
+
+ pr_info("Segment Routing with IPv6\n");
+
+out:
+ return err;
+#ifdef CONFIG_IPV6_SEG6_HMAC
+out_unregister_iptun:
+#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
+ seg6_local_exit();
+ seg6_iptunnel_exit();
+#endif
+#endif
+#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
+out_unregister_pernet:
+ unregister_pernet_subsys(&ip6_segments_ops);
+#endif
+out_unregister_genl:
+ genl_unregister_family(&seg6_genl_family);
+ goto out;
+}
+
+void seg6_exit(void)
+{
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ seg6_hmac_exit();
+#endif
+#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
+ seg6_iptunnel_exit();
+#endif
+ unregister_pernet_subsys(&ip6_segments_ops);
+ genl_unregister_family(&seg6_genl_family);
+}
diff --git a/net/ipv6/seg6_hmac.c b/net/ipv6/seg6_hmac.c
new file mode 100644
index 0000000..8546f94
--- /dev/null
+++ b/net/ipv6/seg6_hmac.c
@@ -0,0 +1,450 @@
+/*
+ * SR-IPv6 implementation -- HMAC functions
+ *
+ * Author:
+ * David Lebrun <david.lebrun@uclouvain.be>
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/icmpv6.h>
+#include <linux/mroute6.h>
+#include <linux/slab.h>
+#include <linux/rhashtable.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/rawv6.h>
+#include <net/ndisc.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/xfrm.h>
+
+#include <linux/cryptohash.h>
+#include <crypto/hash.h>
+#include <crypto/sha.h>
+#include <net/seg6.h>
+#include <net/genetlink.h>
+#include <net/seg6_hmac.h>
+#include <linux/random.h>
+
+static DEFINE_PER_CPU(char [SEG6_HMAC_RING_SIZE], hmac_ring);
+
+static int seg6_hmac_cmpfn(struct rhashtable_compare_arg *arg, const void *obj)
+{
+ const struct seg6_hmac_info *hinfo = obj;
+
+ return (hinfo->hmackeyid != *(__u32 *)arg->key);
+}
+
+static inline void seg6_hinfo_release(struct seg6_hmac_info *hinfo)
+{
+ kfree_rcu(hinfo, rcu);
+}
+
+static void seg6_free_hi(void *ptr, void *arg)
+{
+ struct seg6_hmac_info *hinfo = (struct seg6_hmac_info *)ptr;
+
+ if (hinfo)
+ seg6_hinfo_release(hinfo);
+}
+
+static const struct rhashtable_params rht_params = {
+ .head_offset = offsetof(struct seg6_hmac_info, node),
+ .key_offset = offsetof(struct seg6_hmac_info, hmackeyid),
+ .key_len = sizeof(u32),
+ .automatic_shrinking = true,
+ .obj_cmpfn = seg6_hmac_cmpfn,
+};
+
+static struct seg6_hmac_algo hmac_algos[] = {
+ {
+ .alg_id = SEG6_HMAC_ALGO_SHA1,
+ .name = "hmac(sha1)",
+ },
+ {
+ .alg_id = SEG6_HMAC_ALGO_SHA256,
+ .name = "hmac(sha256)",
+ },
+};
+
+static struct sr6_tlv_hmac *seg6_get_tlv_hmac(struct ipv6_sr_hdr *srh)
+{
+ struct sr6_tlv_hmac *tlv;
+
+ if (srh->hdrlen < (srh->first_segment + 1) * 2 + 5)
+ return NULL;
+
+ if (!sr_has_hmac(srh))
+ return NULL;
+
+ tlv = (struct sr6_tlv_hmac *)
+ ((char *)srh + ((srh->hdrlen + 1) << 3) - 40);
+
+ if (tlv->tlvhdr.type != SR6_TLV_HMAC || tlv->tlvhdr.len != 38)
+ return NULL;
+
+ return tlv;
+}
+
+static struct seg6_hmac_algo *__hmac_get_algo(u8 alg_id)
+{
+ struct seg6_hmac_algo *algo;
+ int i, alg_count;
+
+ alg_count = ARRAY_SIZE(hmac_algos);
+ for (i = 0; i < alg_count; i++) {
+ algo = &hmac_algos[i];
+ if (algo->alg_id == alg_id)
+ return algo;
+ }
+
+ return NULL;
+}
+
+static int __do_hmac(struct seg6_hmac_info *hinfo, const char *text, u8 psize,
+ u8 *output, int outlen)
+{
+ struct seg6_hmac_algo *algo;
+ struct crypto_shash *tfm;
+ struct shash_desc *shash;
+ int ret, dgsize;
+
+ algo = __hmac_get_algo(hinfo->alg_id);
+ if (!algo)
+ return -ENOENT;
+
+ tfm = *this_cpu_ptr(algo->tfms);
+
+ dgsize = crypto_shash_digestsize(tfm);
+ if (dgsize > outlen) {
+ pr_debug("sr-ipv6: __do_hmac: digest size too big (%d / %d)\n",
+ dgsize, outlen);
+ return -ENOMEM;
+ }
+
+ ret = crypto_shash_setkey(tfm, hinfo->secret, hinfo->slen);
+ if (ret < 0) {
+ pr_debug("sr-ipv6: crypto_shash_setkey failed: err %d\n", ret);
+ goto failed;
+ }
+
+ shash = *this_cpu_ptr(algo->shashs);
+ shash->tfm = tfm;
+
+ ret = crypto_shash_digest(shash, text, psize, output);
+ if (ret < 0) {
+ pr_debug("sr-ipv6: crypto_shash_digest failed: err %d\n", ret);
+ goto failed;
+ }
+
+ return dgsize;
+
+failed:
+ return ret;
+}
+
+int seg6_hmac_compute(struct seg6_hmac_info *hinfo, struct ipv6_sr_hdr *hdr,
+ struct in6_addr *saddr, u8 *output)
+{
+ __be32 hmackeyid = cpu_to_be32(hinfo->hmackeyid);
+ u8 tmp_out[SEG6_HMAC_MAX_DIGESTSIZE];
+ int plen, i, dgsize, wrsize;
+ char *ring, *off;
+
+ /* a 160-byte buffer for digest output allows to store highest known
+ * hash function (RadioGatun) with up to 1216 bits
+ */
+
+ /* saddr(16) + first_seg(1) + flags(1) + keyid(4) + seglist(16n) */
+ plen = 16 + 1 + 1 + 4 + (hdr->first_segment + 1) * 16;
+
+ /* this limit allows for 14 segments */
+ if (plen >= SEG6_HMAC_RING_SIZE)
+ return -EMSGSIZE;
+
+ /* Let's build the HMAC text on the ring buffer. The text is composed
+ * as follows, in order:
+ *
+ * 1. Source IPv6 address (128 bits)
+ * 2. first_segment value (8 bits)
+ * 3. Flags (8 bits)
+ * 4. HMAC Key ID (32 bits)
+ * 5. All segments in the segments list (n * 128 bits)
+ */
+
+ local_bh_disable();
+ ring = this_cpu_ptr(hmac_ring);
+ off = ring;
+
+ /* source address */
+ memcpy(off, saddr, 16);
+ off += 16;
+
+ /* first_segment value */
+ *off++ = hdr->first_segment;
+
+ /* flags */
+ *off++ = hdr->flags;
+
+ /* HMAC Key ID */
+ memcpy(off, &hmackeyid, 4);
+ off += 4;
+
+ /* all segments in the list */
+ for (i = 0; i < hdr->first_segment + 1; i++) {
+ memcpy(off, hdr->segments + i, 16);
+ off += 16;
+ }
+
+ dgsize = __do_hmac(hinfo, ring, plen, tmp_out,
+ SEG6_HMAC_MAX_DIGESTSIZE);
+ local_bh_enable();
+
+ if (dgsize < 0)
+ return dgsize;
+
+ wrsize = SEG6_HMAC_FIELD_LEN;
+ if (wrsize > dgsize)
+ wrsize = dgsize;
+
+ memset(output, 0, SEG6_HMAC_FIELD_LEN);
+ memcpy(output, tmp_out, wrsize);
+
+ return 0;
+}
+EXPORT_SYMBOL(seg6_hmac_compute);
+
+/* checks if an incoming SR-enabled packet's HMAC status matches
+ * the incoming policy.
+ *
+ * called with rcu_read_lock()
+ */
+bool seg6_hmac_validate_skb(struct sk_buff *skb)
+{
+ u8 hmac_output[SEG6_HMAC_FIELD_LEN];
+ struct net *net = dev_net(skb->dev);
+ struct seg6_hmac_info *hinfo;
+ struct sr6_tlv_hmac *tlv;
+ struct ipv6_sr_hdr *srh;
+ struct inet6_dev *idev;
+
+ idev = __in6_dev_get(skb->dev);
+
+ srh = (struct ipv6_sr_hdr *)skb_transport_header(skb);
+
+ tlv = seg6_get_tlv_hmac(srh);
+
+ /* mandatory check but no tlv */
+ if (idev->cnf.seg6_require_hmac > 0 && !tlv)
+ return false;
+
+ /* no check */
+ if (idev->cnf.seg6_require_hmac < 0)
+ return true;
+
+ /* check only if present */
+ if (idev->cnf.seg6_require_hmac == 0 && !tlv)
+ return true;
+
+ /* now, seg6_require_hmac >= 0 && tlv */
+
+ hinfo = seg6_hmac_info_lookup(net, be32_to_cpu(tlv->hmackeyid));
+ if (!hinfo)
+ return false;
+
+ if (seg6_hmac_compute(hinfo, srh, &ipv6_hdr(skb)->saddr, hmac_output))
+ return false;
+
+ if (memcmp(hmac_output, tlv->hmac, SEG6_HMAC_FIELD_LEN) != 0)
+ return false;
+
+ return true;
+}
+EXPORT_SYMBOL(seg6_hmac_validate_skb);
+
+/* called with rcu_read_lock() */
+struct seg6_hmac_info *seg6_hmac_info_lookup(struct net *net, u32 key)
+{
+ struct seg6_pernet_data *sdata = seg6_pernet(net);
+ struct seg6_hmac_info *hinfo;
+
+ hinfo = rhashtable_lookup_fast(&sdata->hmac_infos, &key, rht_params);
+
+ return hinfo;
+}
+EXPORT_SYMBOL(seg6_hmac_info_lookup);
+
+int seg6_hmac_info_add(struct net *net, u32 key, struct seg6_hmac_info *hinfo)
+{
+ struct seg6_pernet_data *sdata = seg6_pernet(net);
+ int err;
+
+ err = rhashtable_lookup_insert_fast(&sdata->hmac_infos, &hinfo->node,
+ rht_params);
+
+ return err;
+}
+EXPORT_SYMBOL(seg6_hmac_info_add);
+
+int seg6_hmac_info_del(struct net *net, u32 key)
+{
+ struct seg6_pernet_data *sdata = seg6_pernet(net);
+ struct seg6_hmac_info *hinfo;
+ int err = -ENOENT;
+
+ hinfo = rhashtable_lookup_fast(&sdata->hmac_infos, &key, rht_params);
+ if (!hinfo)
+ goto out;
+
+ err = rhashtable_remove_fast(&sdata->hmac_infos, &hinfo->node,
+ rht_params);
+ if (err)
+ goto out;
+
+ seg6_hinfo_release(hinfo);
+
+out:
+ return err;
+}
+EXPORT_SYMBOL(seg6_hmac_info_del);
+
+int seg6_push_hmac(struct net *net, struct in6_addr *saddr,
+ struct ipv6_sr_hdr *srh)
+{
+ struct seg6_hmac_info *hinfo;
+ struct sr6_tlv_hmac *tlv;
+ int err = -ENOENT;
+
+ tlv = seg6_get_tlv_hmac(srh);
+ if (!tlv)
+ return -EINVAL;
+
+ rcu_read_lock();
+
+ hinfo = seg6_hmac_info_lookup(net, be32_to_cpu(tlv->hmackeyid));
+ if (!hinfo)
+ goto out;
+
+ memset(tlv->hmac, 0, SEG6_HMAC_FIELD_LEN);
+ err = seg6_hmac_compute(hinfo, srh, saddr, tlv->hmac);
+
+out:
+ rcu_read_unlock();
+ return err;
+}
+EXPORT_SYMBOL(seg6_push_hmac);
+
+static int seg6_hmac_init_algo(void)
+{
+ struct seg6_hmac_algo *algo;
+ struct crypto_shash *tfm;
+ struct shash_desc *shash;
+ int i, alg_count, cpu;
+
+ alg_count = ARRAY_SIZE(hmac_algos);
+
+ for (i = 0; i < alg_count; i++) {
+ struct crypto_shash **p_tfm;
+ int shsize;
+
+ algo = &hmac_algos[i];
+ algo->tfms = alloc_percpu(struct crypto_shash *);
+ if (!algo->tfms)
+ return -ENOMEM;
+
+ for_each_possible_cpu(cpu) {
+ tfm = crypto_alloc_shash(algo->name, 0, 0);
+ if (IS_ERR(tfm))
+ return PTR_ERR(tfm);
+ p_tfm = per_cpu_ptr(algo->tfms, cpu);
+ *p_tfm = tfm;
+ }
+
+ p_tfm = raw_cpu_ptr(algo->tfms);
+ tfm = *p_tfm;
+
+ shsize = sizeof(*shash) + crypto_shash_descsize(tfm);
+
+ algo->shashs = alloc_percpu(struct shash_desc *);
+ if (!algo->shashs)
+ return -ENOMEM;
+
+ for_each_possible_cpu(cpu) {
+ shash = kzalloc_node(shsize, GFP_KERNEL,
+ cpu_to_node(cpu));
+ if (!shash)
+ return -ENOMEM;
+ *per_cpu_ptr(algo->shashs, cpu) = shash;
+ }
+ }
+
+ return 0;
+}
+
+int __init seg6_hmac_init(void)
+{
+ return seg6_hmac_init_algo();
+}
+EXPORT_SYMBOL(seg6_hmac_init);
+
+int __net_init seg6_hmac_net_init(struct net *net)
+{
+ struct seg6_pernet_data *sdata = seg6_pernet(net);
+
+ rhashtable_init(&sdata->hmac_infos, &rht_params);
+
+ return 0;
+}
+EXPORT_SYMBOL(seg6_hmac_net_init);
+
+void seg6_hmac_exit(void)
+{
+ struct seg6_hmac_algo *algo = NULL;
+ int i, alg_count, cpu;
+
+ alg_count = ARRAY_SIZE(hmac_algos);
+ for (i = 0; i < alg_count; i++) {
+ algo = &hmac_algos[i];
+ for_each_possible_cpu(cpu) {
+ struct crypto_shash *tfm;
+ struct shash_desc *shash;
+
+ shash = *per_cpu_ptr(algo->shashs, cpu);
+ kfree(shash);
+ tfm = *per_cpu_ptr(algo->tfms, cpu);
+ crypto_free_shash(tfm);
+ }
+ free_percpu(algo->tfms);
+ free_percpu(algo->shashs);
+ }
+}
+EXPORT_SYMBOL(seg6_hmac_exit);
+
+void __net_exit seg6_hmac_net_exit(struct net *net)
+{
+ struct seg6_pernet_data *sdata = seg6_pernet(net);
+
+ rhashtable_free_and_destroy(&sdata->hmac_infos, seg6_free_hi, NULL);
+}
+EXPORT_SYMBOL(seg6_hmac_net_exit);
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
new file mode 100644
index 0000000..8181ee7
--- /dev/null
+++ b/net/ipv6/seg6_iptunnel.c
@@ -0,0 +1,516 @@
+/*
+ * SR-IPv6 implementation
+ *
+ * Author:
+ * David Lebrun <david.lebrun@uclouvain.be>
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/types.h>
+#include <linux/skbuff.h>
+#include <linux/net.h>
+#include <linux/module.h>
+#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/lwtunnel.h>
+#include <net/netevent.h>
+#include <net/netns/generic.h>
+#include <net/ip6_fib.h>
+#include <net/route.h>
+#include <net/seg6.h>
+#include <linux/seg6.h>
+#include <linux/seg6_iptunnel.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+#include <net/dst_cache.h>
+#ifdef CONFIG_IPV6_SEG6_HMAC
+#include <net/seg6_hmac.h>
+#endif
+
+struct seg6_lwt {
+ struct dst_cache cache;
+ struct seg6_iptunnel_encap tuninfo[0];
+};
+
+static inline struct seg6_lwt *seg6_lwt_lwtunnel(struct lwtunnel_state *lwt)
+{
+ return (struct seg6_lwt *)lwt->data;
+}
+
+static inline struct seg6_iptunnel_encap *
+seg6_encap_lwtunnel(struct lwtunnel_state *lwt)
+{
+ return seg6_lwt_lwtunnel(lwt)->tuninfo;
+}
+
+static const struct nla_policy seg6_iptunnel_policy[SEG6_IPTUNNEL_MAX + 1] = {
+ [SEG6_IPTUNNEL_SRH] = { .type = NLA_BINARY },
+};
+
+static int nla_put_srh(struct sk_buff *skb, int attrtype,
+ struct seg6_iptunnel_encap *tuninfo)
+{
+ struct seg6_iptunnel_encap *data;
+ struct nlattr *nla;
+ int len;
+
+ len = SEG6_IPTUN_ENCAP_SIZE(tuninfo);
+
+ nla = nla_reserve(skb, attrtype, len);
+ if (!nla)
+ return -EMSGSIZE;
+
+ data = nla_data(nla);
+ memcpy(data, tuninfo, len);
+
+ return 0;
+}
+
+static void set_tun_src(struct net *net, struct net_device *dev,
+ struct in6_addr *daddr, struct in6_addr *saddr)
+{
+ struct seg6_pernet_data *sdata = seg6_pernet(net);
+ struct in6_addr *tun_src;
+
+ rcu_read_lock();
+
+ tun_src = rcu_dereference(sdata->tun_src);
+
+ if (!ipv6_addr_any(tun_src)) {
+ memcpy(saddr, tun_src, sizeof(struct in6_addr));
+ } else {
+ ipv6_dev_get_saddr(net, dev, daddr, IPV6_PREFER_SRC_PUBLIC,
+ saddr);
+ }
+
+ rcu_read_unlock();
+}
+
+/* Compute flowlabel for outer IPv6 header */
+static __be32 seg6_make_flowlabel(struct net *net, struct sk_buff *skb,
+ struct ipv6hdr *inner_hdr)
+{
+ int do_flowlabel = net->ipv6.sysctl.seg6_flowlabel;
+ __be32 flowlabel = 0;
+ u32 hash;
+
+ if (do_flowlabel > 0) {
+ hash = skb_get_hash(skb);
+ hash = rol32(hash, 16);
+ flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
+ } else if (!do_flowlabel && skb->protocol == htons(ETH_P_IPV6)) {
+ flowlabel = ip6_flowlabel(inner_hdr);
+ }
+ return flowlabel;
+}
+
+/* encapsulate an IPv6 packet within an outer IPv6 header with a given SRH */
+int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
+{
+ struct dst_entry *dst = skb_dst(skb);
+ struct net *net = dev_net(dst->dev);
+ struct ipv6hdr *hdr, *inner_hdr;
+ struct ipv6_sr_hdr *isrh;
+ int hdrlen, tot_len, err;
+ __be32 flowlabel;
+
+ hdrlen = (osrh->hdrlen + 1) << 3;
+ tot_len = hdrlen + sizeof(*hdr);
+
+ err = skb_cow_head(skb, tot_len + skb->mac_len);
+ if (unlikely(err))
+ return err;
+
+ inner_hdr = ipv6_hdr(skb);
+ flowlabel = seg6_make_flowlabel(net, skb, inner_hdr);
+
+ skb_push(skb, tot_len);
+ skb_reset_network_header(skb);
+ skb_mac_header_rebuild(skb);
+ hdr = ipv6_hdr(skb);
+
+ /* inherit tc, flowlabel and hlim
+ * hlim will be decremented in ip6_forward() afterwards and
+ * decapsulation will overwrite inner hlim with outer hlim
+ */
+
+ if (skb->protocol == htons(ETH_P_IPV6)) {
+ ip6_flow_hdr(hdr, ip6_tclass(ip6_flowinfo(inner_hdr)),
+ flowlabel);
+ hdr->hop_limit = inner_hdr->hop_limit;
+ } else {
+ ip6_flow_hdr(hdr, 0, flowlabel);
+ hdr->hop_limit = ip6_dst_hoplimit(skb_dst(skb));
+ }
+
+ hdr->nexthdr = NEXTHDR_ROUTING;
+
+ isrh = (void *)hdr + sizeof(*hdr);
+ memcpy(isrh, osrh, hdrlen);
+
+ isrh->nexthdr = proto;
+
+ hdr->daddr = isrh->segments[isrh->first_segment];
+ set_tun_src(net, dst->dev, &hdr->daddr, &hdr->saddr);
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ if (sr_has_hmac(isrh)) {
+ err = seg6_push_hmac(net, &hdr->saddr, isrh);
+ if (unlikely(err))
+ return err;
+ }
+#endif
+
+ skb_postpush_rcsum(skb, hdr, tot_len);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(seg6_do_srh_encap);
+
+/* insert an SRH within an IPv6 packet, just after the IPv6 header */
+int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh)
+{
+ struct ipv6hdr *hdr, *oldhdr;
+ struct ipv6_sr_hdr *isrh;
+ int hdrlen, err;
+
+ hdrlen = (osrh->hdrlen + 1) << 3;
+
+ err = skb_cow_head(skb, hdrlen + skb->mac_len);
+ if (unlikely(err))
+ return err;
+
+ oldhdr = ipv6_hdr(skb);
+
+ skb_pull(skb, sizeof(struct ipv6hdr));
+ skb_postpull_rcsum(skb, skb_network_header(skb),
+ sizeof(struct ipv6hdr));
+
+ skb_push(skb, sizeof(struct ipv6hdr) + hdrlen);
+ skb_reset_network_header(skb);
+ skb_mac_header_rebuild(skb);
+
+ hdr = ipv6_hdr(skb);
+
+ memmove(hdr, oldhdr, sizeof(*hdr));
+
+ isrh = (void *)hdr + sizeof(*hdr);
+ memcpy(isrh, osrh, hdrlen);
+
+ isrh->nexthdr = hdr->nexthdr;
+ hdr->nexthdr = NEXTHDR_ROUTING;
+
+ isrh->segments[0] = hdr->daddr;
+ hdr->daddr = isrh->segments[isrh->first_segment];
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ if (sr_has_hmac(isrh)) {
+ struct net *net = dev_net(skb_dst(skb)->dev);
+
+ err = seg6_push_hmac(net, &hdr->saddr, isrh);
+ if (unlikely(err))
+ return err;
+ }
+#endif
+
+ skb_postpush_rcsum(skb, hdr, sizeof(struct ipv6hdr) + hdrlen);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(seg6_do_srh_inline);
+
+static int seg6_do_srh(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb_dst(skb);
+ struct seg6_iptunnel_encap *tinfo;
+ int proto, err = 0;
+
+ tinfo = seg6_encap_lwtunnel(dst->lwtstate);
+
+ switch (tinfo->mode) {
+ case SEG6_IPTUN_MODE_INLINE:
+ if (skb->protocol != htons(ETH_P_IPV6))
+ return -EINVAL;
+
+ err = seg6_do_srh_inline(skb, tinfo->srh);
+ if (err)
+ return err;
+ break;
+ case SEG6_IPTUN_MODE_ENCAP:
+ err = iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6);
+ if (err)
+ return err;
+
+ if (skb->protocol == htons(ETH_P_IPV6))
+ proto = IPPROTO_IPV6;
+ else if (skb->protocol == htons(ETH_P_IP))
+ proto = IPPROTO_IPIP;
+ else
+ return -EINVAL;
+
+ err = seg6_do_srh_encap(skb, tinfo->srh, proto);
+ if (err)
+ return err;
+
+ skb_set_inner_transport_header(skb, skb_transport_offset(skb));
+ skb_set_inner_protocol(skb, skb->protocol);
+ skb->protocol = htons(ETH_P_IPV6);
+ break;
+ case SEG6_IPTUN_MODE_L2ENCAP:
+ if (!skb_mac_header_was_set(skb))
+ return -EINVAL;
+
+ if (pskb_expand_head(skb, skb->mac_len, 0, GFP_ATOMIC) < 0)
+ return -ENOMEM;
+
+ skb_mac_header_rebuild(skb);
+ skb_push(skb, skb->mac_len);
+
+ err = seg6_do_srh_encap(skb, tinfo->srh, NEXTHDR_NONE);
+ if (err)
+ return err;
+
+ skb->protocol = htons(ETH_P_IPV6);
+ break;
+ }
+
+ ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
+ skb_set_transport_header(skb, sizeof(struct ipv6hdr));
+
+ return 0;
+}
+
+static int seg6_input(struct sk_buff *skb)
+{
+ struct dst_entry *orig_dst = skb_dst(skb);
+ struct dst_entry *dst = NULL;
+ struct seg6_lwt *slwt;
+ int err;
+
+ err = seg6_do_srh(skb);
+ if (unlikely(err)) {
+ kfree_skb(skb);
+ return err;
+ }
+
+ slwt = seg6_lwt_lwtunnel(orig_dst->lwtstate);
+
+ preempt_disable();
+ dst = dst_cache_get(&slwt->cache);
+ preempt_enable();
+
+ skb_dst_drop(skb);
+
+ if (!dst) {
+ ip6_route_input(skb);
+ dst = skb_dst(skb);
+ if (!dst->error) {
+ preempt_disable();
+ dst_cache_set_ip6(&slwt->cache, dst,
+ &ipv6_hdr(skb)->saddr);
+ preempt_enable();
+ }
+ } else {
+ skb_dst_set(skb, dst);
+ }
+
+ err = skb_cow_head(skb, LL_RESERVED_SPACE(dst->dev));
+ if (unlikely(err))
+ return err;
+
+ return dst_input(skb);
+}
+
+static int seg6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ struct dst_entry *orig_dst = skb_dst(skb);
+ struct dst_entry *dst = NULL;
+ struct seg6_lwt *slwt;
+ int err = -EINVAL;
+
+ err = seg6_do_srh(skb);
+ if (unlikely(err))
+ goto drop;
+
+ slwt = seg6_lwt_lwtunnel(orig_dst->lwtstate);
+
+ preempt_disable();
+ dst = dst_cache_get(&slwt->cache);
+ preempt_enable();
+
+ if (unlikely(!dst)) {
+ struct ipv6hdr *hdr = ipv6_hdr(skb);
+ struct flowi6 fl6;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.daddr = hdr->daddr;
+ fl6.saddr = hdr->saddr;
+ fl6.flowlabel = ip6_flowinfo(hdr);
+ fl6.flowi6_mark = skb->mark;
+ fl6.flowi6_proto = hdr->nexthdr;
+
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (dst->error) {
+ err = dst->error;
+ dst_release(dst);
+ goto drop;
+ }
+
+ preempt_disable();
+ dst_cache_set_ip6(&slwt->cache, dst, &fl6.saddr);
+ preempt_enable();
+ }
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst);
+
+ err = skb_cow_head(skb, LL_RESERVED_SPACE(dst->dev));
+ if (unlikely(err))
+ goto drop;
+
+ return dst_output(net, sk, skb);
+drop:
+ kfree_skb(skb);
+ return err;
+}
+
+static int seg6_build_state(struct nlattr *nla,
+ unsigned int family, const void *cfg,
+ struct lwtunnel_state **ts,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[SEG6_IPTUNNEL_MAX + 1];
+ struct seg6_iptunnel_encap *tuninfo;
+ struct lwtunnel_state *newts;
+ int tuninfo_len, min_size;
+ struct seg6_lwt *slwt;
+ int err;
+
+ if (family != AF_INET && family != AF_INET6)
+ return -EINVAL;
+
+ err = nla_parse_nested(tb, SEG6_IPTUNNEL_MAX, nla,
+ seg6_iptunnel_policy, extack);
+
+ if (err < 0)
+ return err;
+
+ if (!tb[SEG6_IPTUNNEL_SRH])
+ return -EINVAL;
+
+ tuninfo = nla_data(tb[SEG6_IPTUNNEL_SRH]);
+ tuninfo_len = nla_len(tb[SEG6_IPTUNNEL_SRH]);
+
+ /* tuninfo must contain at least the iptunnel encap structure,
+ * the SRH and one segment
+ */
+ min_size = sizeof(*tuninfo) + sizeof(struct ipv6_sr_hdr) +
+ sizeof(struct in6_addr);
+ if (tuninfo_len < min_size)
+ return -EINVAL;
+
+ switch (tuninfo->mode) {
+ case SEG6_IPTUN_MODE_INLINE:
+ if (family != AF_INET6)
+ return -EINVAL;
+
+ break;
+ case SEG6_IPTUN_MODE_ENCAP:
+ break;
+ case SEG6_IPTUN_MODE_L2ENCAP:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* verify that SRH is consistent */
+ if (!seg6_validate_srh(tuninfo->srh, tuninfo_len - sizeof(*tuninfo)))
+ return -EINVAL;
+
+ newts = lwtunnel_state_alloc(tuninfo_len + sizeof(*slwt));
+ if (!newts)
+ return -ENOMEM;
+
+ slwt = seg6_lwt_lwtunnel(newts);
+
+ err = dst_cache_init(&slwt->cache, GFP_ATOMIC);
+ if (err) {
+ kfree(newts);
+ return err;
+ }
+
+ memcpy(&slwt->tuninfo, tuninfo, tuninfo_len);
+
+ newts->type = LWTUNNEL_ENCAP_SEG6;
+ newts->flags |= LWTUNNEL_STATE_INPUT_REDIRECT;
+
+ if (tuninfo->mode != SEG6_IPTUN_MODE_L2ENCAP)
+ newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT;
+
+ newts->headroom = seg6_lwt_headroom(tuninfo);
+
+ *ts = newts;
+
+ return 0;
+}
+
+static void seg6_destroy_state(struct lwtunnel_state *lwt)
+{
+ dst_cache_destroy(&seg6_lwt_lwtunnel(lwt)->cache);
+}
+
+static int seg6_fill_encap_info(struct sk_buff *skb,
+ struct lwtunnel_state *lwtstate)
+{
+ struct seg6_iptunnel_encap *tuninfo = seg6_encap_lwtunnel(lwtstate);
+
+ if (nla_put_srh(skb, SEG6_IPTUNNEL_SRH, tuninfo))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int seg6_encap_nlsize(struct lwtunnel_state *lwtstate)
+{
+ struct seg6_iptunnel_encap *tuninfo = seg6_encap_lwtunnel(lwtstate);
+
+ return nla_total_size(SEG6_IPTUN_ENCAP_SIZE(tuninfo));
+}
+
+static int seg6_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
+{
+ struct seg6_iptunnel_encap *a_hdr = seg6_encap_lwtunnel(a);
+ struct seg6_iptunnel_encap *b_hdr = seg6_encap_lwtunnel(b);
+ int len = SEG6_IPTUN_ENCAP_SIZE(a_hdr);
+
+ if (len != SEG6_IPTUN_ENCAP_SIZE(b_hdr))
+ return 1;
+
+ return memcmp(a_hdr, b_hdr, len);
+}
+
+static const struct lwtunnel_encap_ops seg6_iptun_ops = {
+ .build_state = seg6_build_state,
+ .destroy_state = seg6_destroy_state,
+ .output = seg6_output,
+ .input = seg6_input,
+ .fill_encap = seg6_fill_encap_info,
+ .get_encap_size = seg6_encap_nlsize,
+ .cmp_encap = seg6_encap_cmp,
+ .owner = THIS_MODULE,
+};
+
+int __init seg6_iptunnel_init(void)
+{
+ return lwtunnel_encap_add_ops(&seg6_iptun_ops, LWTUNNEL_ENCAP_SEG6);
+}
+
+void seg6_iptunnel_exit(void)
+{
+ lwtunnel_encap_del_ops(&seg6_iptun_ops, LWTUNNEL_ENCAP_SEG6);
+}
diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
new file mode 100644
index 0000000..60325db
--- /dev/null
+++ b/net/ipv6/seg6_local.c
@@ -0,0 +1,1114 @@
+/*
+ * SR-IPv6 implementation
+ *
+ * Authors:
+ * David Lebrun <david.lebrun@uclouvain.be>
+ * eBPF support: Mathieu Xhonneux <m.xhonneux@gmail.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/types.h>
+#include <linux/skbuff.h>
+#include <linux/net.h>
+#include <linux/module.h>
+#include <net/ip.h>
+#include <net/lwtunnel.h>
+#include <net/netevent.h>
+#include <net/netns/generic.h>
+#include <net/ip6_fib.h>
+#include <net/route.h>
+#include <net/seg6.h>
+#include <linux/seg6.h>
+#include <linux/seg6_local.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+#include <net/dst_cache.h>
+#ifdef CONFIG_IPV6_SEG6_HMAC
+#include <net/seg6_hmac.h>
+#endif
+#include <net/seg6_local.h>
+#include <linux/etherdevice.h>
+#include <linux/bpf.h>
+
+struct seg6_local_lwt;
+
+struct seg6_action_desc {
+ int action;
+ unsigned long attrs;
+ int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
+ int static_headroom;
+};
+
+struct bpf_lwt_prog {
+ struct bpf_prog *prog;
+ char *name;
+};
+
+struct seg6_local_lwt {
+ int action;
+ struct ipv6_sr_hdr *srh;
+ int table;
+ struct in_addr nh4;
+ struct in6_addr nh6;
+ int iif;
+ int oif;
+ struct bpf_lwt_prog bpf;
+
+ int headroom;
+ struct seg6_action_desc *desc;
+};
+
+static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
+{
+ return (struct seg6_local_lwt *)lwt->data;
+}
+
+static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb)
+{
+ struct ipv6_sr_hdr *srh;
+ int len, srhoff = 0;
+
+ if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
+ return NULL;
+
+ if (!pskb_may_pull(skb, srhoff + sizeof(*srh)))
+ return NULL;
+
+ srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
+
+ len = (srh->hdrlen + 1) << 3;
+
+ if (!pskb_may_pull(skb, srhoff + len))
+ return NULL;
+
+ if (!seg6_validate_srh(srh, len))
+ return NULL;
+
+ return srh;
+}
+
+static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb)
+{
+ struct ipv6_sr_hdr *srh;
+
+ srh = get_srh(skb);
+ if (!srh)
+ return NULL;
+
+ if (srh->segments_left == 0)
+ return NULL;
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ if (!seg6_hmac_validate_skb(skb))
+ return NULL;
+#endif
+
+ return srh;
+}
+
+static bool decap_and_validate(struct sk_buff *skb, int proto)
+{
+ struct ipv6_sr_hdr *srh;
+ unsigned int off = 0;
+
+ srh = get_srh(skb);
+ if (srh && srh->segments_left > 0)
+ return false;
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ if (srh && !seg6_hmac_validate_skb(skb))
+ return false;
+#endif
+
+ if (ipv6_find_hdr(skb, &off, proto, NULL, NULL) < 0)
+ return false;
+
+ if (!pskb_pull(skb, off))
+ return false;
+
+ skb_postpull_rcsum(skb, skb_network_header(skb), off);
+
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+ skb->encapsulation = 0;
+
+ return true;
+}
+
+static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr)
+{
+ struct in6_addr *addr;
+
+ srh->segments_left--;
+ addr = srh->segments + srh->segments_left;
+ *daddr = *addr;
+}
+
+int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
+ u32 tbl_id)
+{
+ struct net *net = dev_net(skb->dev);
+ struct ipv6hdr *hdr = ipv6_hdr(skb);
+ int flags = RT6_LOOKUP_F_HAS_SADDR;
+ struct dst_entry *dst = NULL;
+ struct rt6_info *rt;
+ struct flowi6 fl6;
+
+ fl6.flowi6_iif = skb->dev->ifindex;
+ fl6.daddr = nhaddr ? *nhaddr : hdr->daddr;
+ fl6.saddr = hdr->saddr;
+ fl6.flowlabel = ip6_flowinfo(hdr);
+ fl6.flowi6_mark = skb->mark;
+ fl6.flowi6_proto = hdr->nexthdr;
+
+ if (nhaddr)
+ fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH;
+
+ if (!tbl_id) {
+ dst = ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags);
+ } else {
+ struct fib6_table *table;
+
+ table = fib6_get_table(net, tbl_id);
+ if (!table)
+ goto out;
+
+ rt = ip6_pol_route(net, table, 0, &fl6, skb, flags);
+ dst = &rt->dst;
+ }
+
+ if (dst && dst->dev->flags & IFF_LOOPBACK && !dst->error) {
+ dst_release(dst);
+ dst = NULL;
+ }
+
+out:
+ if (!dst) {
+ rt = net->ipv6.ip6_blk_hole_entry;
+ dst = &rt->dst;
+ dst_hold(dst);
+ }
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst);
+ return dst->error;
+}
+
+/* regular endpoint function */
+static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct ipv6_sr_hdr *srh;
+
+ srh = get_and_validate_srh(skb);
+ if (!srh)
+ goto drop;
+
+ advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
+
+ seg6_lookup_nexthop(skb, NULL, 0);
+
+ return dst_input(skb);
+
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+/* regular endpoint, and forward to specified nexthop */
+static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct ipv6_sr_hdr *srh;
+
+ srh = get_and_validate_srh(skb);
+ if (!srh)
+ goto drop;
+
+ advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
+
+ seg6_lookup_nexthop(skb, &slwt->nh6, 0);
+
+ return dst_input(skb);
+
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct ipv6_sr_hdr *srh;
+
+ srh = get_and_validate_srh(skb);
+ if (!srh)
+ goto drop;
+
+ advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
+
+ seg6_lookup_nexthop(skb, NULL, slwt->table);
+
+ return dst_input(skb);
+
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+/* decapsulate and forward inner L2 frame on specified interface */
+static int input_action_end_dx2(struct sk_buff *skb,
+ struct seg6_local_lwt *slwt)
+{
+ struct net *net = dev_net(skb->dev);
+ struct net_device *odev;
+ struct ethhdr *eth;
+
+ if (!decap_and_validate(skb, NEXTHDR_NONE))
+ goto drop;
+
+ if (!pskb_may_pull(skb, ETH_HLEN))
+ goto drop;
+
+ skb_reset_mac_header(skb);
+ eth = (struct ethhdr *)skb->data;
+
+ /* To determine the frame's protocol, we assume it is 802.3. This avoids
+ * a call to eth_type_trans(), which is not really relevant for our
+ * use case.
+ */
+ if (!eth_proto_is_802_3(eth->h_proto))
+ goto drop;
+
+ odev = dev_get_by_index_rcu(net, slwt->oif);
+ if (!odev)
+ goto drop;
+
+ /* As we accept Ethernet frames, make sure the egress device is of
+ * the correct type.
+ */
+ if (odev->type != ARPHRD_ETHER)
+ goto drop;
+
+ if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev))
+ goto drop;
+
+ skb_orphan(skb);
+
+ if (skb_warn_if_lro(skb))
+ goto drop;
+
+ skb_forward_csum(skb);
+
+ if (skb->len - ETH_HLEN > odev->mtu)
+ goto drop;
+
+ skb->dev = odev;
+ skb->protocol = eth->h_proto;
+
+ return dev_queue_xmit(skb);
+
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+/* decapsulate and forward to specified nexthop */
+static int input_action_end_dx6(struct sk_buff *skb,
+ struct seg6_local_lwt *slwt)
+{
+ struct in6_addr *nhaddr = NULL;
+
+ /* this function accepts IPv6 encapsulated packets, with either
+ * an SRH with SL=0, or no SRH.
+ */
+
+ if (!decap_and_validate(skb, IPPROTO_IPV6))
+ goto drop;
+
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ goto drop;
+
+ /* The inner packet is not associated to any local interface,
+ * so we do not call netif_rx().
+ *
+ * If slwt->nh6 is set to ::, then lookup the nexthop for the
+ * inner packet's DA. Otherwise, use the specified nexthop.
+ */
+
+ if (!ipv6_addr_any(&slwt->nh6))
+ nhaddr = &slwt->nh6;
+
+ seg6_lookup_nexthop(skb, nhaddr, 0);
+
+ return dst_input(skb);
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+static int input_action_end_dx4(struct sk_buff *skb,
+ struct seg6_local_lwt *slwt)
+{
+ struct iphdr *iph;
+ __be32 nhaddr;
+ int err;
+
+ if (!decap_and_validate(skb, IPPROTO_IPIP))
+ goto drop;
+
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ goto drop;
+
+ skb->protocol = htons(ETH_P_IP);
+
+ iph = ip_hdr(skb);
+
+ nhaddr = slwt->nh4.s_addr ?: iph->daddr;
+
+ skb_dst_drop(skb);
+
+ err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);
+ if (err)
+ goto drop;
+
+ return dst_input(skb);
+
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+static int input_action_end_dt6(struct sk_buff *skb,
+ struct seg6_local_lwt *slwt)
+{
+ if (!decap_and_validate(skb, IPPROTO_IPV6))
+ goto drop;
+
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ goto drop;
+
+ seg6_lookup_nexthop(skb, NULL, slwt->table);
+
+ return dst_input(skb);
+
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+/* push an SRH on top of the current one */
+static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct ipv6_sr_hdr *srh;
+ int err = -EINVAL;
+
+ srh = get_and_validate_srh(skb);
+ if (!srh)
+ goto drop;
+
+ err = seg6_do_srh_inline(skb, slwt->srh);
+ if (err)
+ goto drop;
+
+ ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
+ skb_set_transport_header(skb, sizeof(struct ipv6hdr));
+
+ seg6_lookup_nexthop(skb, NULL, 0);
+
+ return dst_input(skb);
+
+drop:
+ kfree_skb(skb);
+ return err;
+}
+
+/* encapsulate within an outer IPv6 header and a specified SRH */
+static int input_action_end_b6_encap(struct sk_buff *skb,
+ struct seg6_local_lwt *slwt)
+{
+ struct ipv6_sr_hdr *srh;
+ int err = -EINVAL;
+
+ srh = get_and_validate_srh(skb);
+ if (!srh)
+ goto drop;
+
+ advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
+
+ skb_reset_inner_headers(skb);
+ skb->encapsulation = 1;
+
+ err = seg6_do_srh_encap(skb, slwt->srh, IPPROTO_IPV6);
+ if (err)
+ goto drop;
+
+ ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
+ skb_set_transport_header(skb, sizeof(struct ipv6hdr));
+
+ seg6_lookup_nexthop(skb, NULL, 0);
+
+ return dst_input(skb);
+
+drop:
+ kfree_skb(skb);
+ return err;
+}
+
+DEFINE_PER_CPU(struct seg6_bpf_srh_state, seg6_bpf_srh_states);
+
+bool seg6_bpf_has_valid_srh(struct sk_buff *skb)
+{
+ struct seg6_bpf_srh_state *srh_state =
+ this_cpu_ptr(&seg6_bpf_srh_states);
+ struct ipv6_sr_hdr *srh = srh_state->srh;
+
+ if (unlikely(srh == NULL))
+ return false;
+
+ if (unlikely(!srh_state->valid)) {
+ if ((srh_state->hdrlen & 7) != 0)
+ return false;
+
+ srh->hdrlen = (u8)(srh_state->hdrlen >> 3);
+ if (!seg6_validate_srh(srh, (srh->hdrlen + 1) << 3))
+ return false;
+
+ srh_state->valid = true;
+ }
+
+ return true;
+}
+
+static int input_action_end_bpf(struct sk_buff *skb,
+ struct seg6_local_lwt *slwt)
+{
+ struct seg6_bpf_srh_state *srh_state =
+ this_cpu_ptr(&seg6_bpf_srh_states);
+ struct ipv6_sr_hdr *srh;
+ int ret;
+
+ srh = get_and_validate_srh(skb);
+ if (!srh) {
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+ advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
+
+ /* preempt_disable is needed to protect the per-CPU buffer srh_state,
+ * which is also accessed by the bpf_lwt_seg6_* helpers
+ */
+ preempt_disable();
+ srh_state->srh = srh;
+ srh_state->hdrlen = srh->hdrlen << 3;
+ srh_state->valid = true;
+
+ rcu_read_lock();
+ bpf_compute_data_pointers(skb);
+ ret = bpf_prog_run_save_cb(slwt->bpf.prog, skb);
+ rcu_read_unlock();
+
+ switch (ret) {
+ case BPF_OK:
+ case BPF_REDIRECT:
+ break;
+ case BPF_DROP:
+ goto drop;
+ default:
+ pr_warn_once("bpf-seg6local: Illegal return value %u\n", ret);
+ goto drop;
+ }
+
+ if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
+ goto drop;
+
+ preempt_enable();
+ if (ret != BPF_REDIRECT)
+ seg6_lookup_nexthop(skb, NULL, 0);
+
+ return dst_input(skb);
+
+drop:
+ preempt_enable();
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+static struct seg6_action_desc seg6_action_table[] = {
+ {
+ .action = SEG6_LOCAL_ACTION_END,
+ .attrs = 0,
+ .input = input_action_end,
+ },
+ {
+ .action = SEG6_LOCAL_ACTION_END_X,
+ .attrs = (1 << SEG6_LOCAL_NH6),
+ .input = input_action_end_x,
+ },
+ {
+ .action = SEG6_LOCAL_ACTION_END_T,
+ .attrs = (1 << SEG6_LOCAL_TABLE),
+ .input = input_action_end_t,
+ },
+ {
+ .action = SEG6_LOCAL_ACTION_END_DX2,
+ .attrs = (1 << SEG6_LOCAL_OIF),
+ .input = input_action_end_dx2,
+ },
+ {
+ .action = SEG6_LOCAL_ACTION_END_DX6,
+ .attrs = (1 << SEG6_LOCAL_NH6),
+ .input = input_action_end_dx6,
+ },
+ {
+ .action = SEG6_LOCAL_ACTION_END_DX4,
+ .attrs = (1 << SEG6_LOCAL_NH4),
+ .input = input_action_end_dx4,
+ },
+ {
+ .action = SEG6_LOCAL_ACTION_END_DT6,
+ .attrs = (1 << SEG6_LOCAL_TABLE),
+ .input = input_action_end_dt6,
+ },
+ {
+ .action = SEG6_LOCAL_ACTION_END_B6,
+ .attrs = (1 << SEG6_LOCAL_SRH),
+ .input = input_action_end_b6,
+ },
+ {
+ .action = SEG6_LOCAL_ACTION_END_B6_ENCAP,
+ .attrs = (1 << SEG6_LOCAL_SRH),
+ .input = input_action_end_b6_encap,
+ .static_headroom = sizeof(struct ipv6hdr),
+ },
+ {
+ .action = SEG6_LOCAL_ACTION_END_BPF,
+ .attrs = (1 << SEG6_LOCAL_BPF),
+ .input = input_action_end_bpf,
+ },
+
+};
+
+static struct seg6_action_desc *__get_action_desc(int action)
+{
+ struct seg6_action_desc *desc;
+ int i, count;
+
+ count = ARRAY_SIZE(seg6_action_table);
+ for (i = 0; i < count; i++) {
+ desc = &seg6_action_table[i];
+ if (desc->action == action)
+ return desc;
+ }
+
+ return NULL;
+}
+
+static int seg6_local_input(struct sk_buff *skb)
+{
+ struct dst_entry *orig_dst = skb_dst(skb);
+ struct seg6_action_desc *desc;
+ struct seg6_local_lwt *slwt;
+
+ if (skb->protocol != htons(ETH_P_IPV6)) {
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+
+ slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
+ desc = slwt->desc;
+
+ return desc->input(skb, slwt);
+}
+
+static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = {
+ [SEG6_LOCAL_ACTION] = { .type = NLA_U32 },
+ [SEG6_LOCAL_SRH] = { .type = NLA_BINARY },
+ [SEG6_LOCAL_TABLE] = { .type = NLA_U32 },
+ [SEG6_LOCAL_NH4] = { .type = NLA_BINARY,
+ .len = sizeof(struct in_addr) },
+ [SEG6_LOCAL_NH6] = { .type = NLA_BINARY,
+ .len = sizeof(struct in6_addr) },
+ [SEG6_LOCAL_IIF] = { .type = NLA_U32 },
+ [SEG6_LOCAL_OIF] = { .type = NLA_U32 },
+ [SEG6_LOCAL_BPF] = { .type = NLA_NESTED },
+};
+
+static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ struct ipv6_sr_hdr *srh;
+ int len;
+
+ srh = nla_data(attrs[SEG6_LOCAL_SRH]);
+ len = nla_len(attrs[SEG6_LOCAL_SRH]);
+
+ /* SRH must contain at least one segment */
+ if (len < sizeof(*srh) + sizeof(struct in6_addr))
+ return -EINVAL;
+
+ if (!seg6_validate_srh(srh, len))
+ return -EINVAL;
+
+ slwt->srh = kmemdup(srh, len, GFP_KERNEL);
+ if (!slwt->srh)
+ return -ENOMEM;
+
+ slwt->headroom += len;
+
+ return 0;
+}
+
+static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct ipv6_sr_hdr *srh;
+ struct nlattr *nla;
+ int len;
+
+ srh = slwt->srh;
+ len = (srh->hdrlen + 1) << 3;
+
+ nla = nla_reserve(skb, SEG6_LOCAL_SRH, len);
+ if (!nla)
+ return -EMSGSIZE;
+
+ memcpy(nla_data(nla), srh, len);
+
+ return 0;
+}
+
+static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ int len = (a->srh->hdrlen + 1) << 3;
+
+ if (len != ((b->srh->hdrlen + 1) << 3))
+ return 1;
+
+ return memcmp(a->srh, b->srh, len);
+}
+
+static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]);
+
+ return 0;
+}
+
+static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ if (a->table != b->table)
+ return 1;
+
+ return 0;
+}
+
+static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]),
+ sizeof(struct in_addr));
+
+ return 0;
+}
+
+static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct nlattr *nla;
+
+ nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr));
+ if (!nla)
+ return -EMSGSIZE;
+
+ memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr));
+
+ return 0;
+}
+
+static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr));
+}
+
+static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]),
+ sizeof(struct in6_addr));
+
+ return 0;
+}
+
+static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct nlattr *nla;
+
+ nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr));
+ if (!nla)
+ return -EMSGSIZE;
+
+ memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr));
+
+ return 0;
+}
+
+static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr));
+}
+
+static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]);
+
+ return 0;
+}
+
+static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ if (a->iif != b->iif)
+ return 1;
+
+ return 0;
+}
+
+static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]);
+
+ return 0;
+}
+
+static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ if (a->oif != b->oif)
+ return 1;
+
+ return 0;
+}
+
+#define MAX_PROG_NAME 256
+static const struct nla_policy bpf_prog_policy[SEG6_LOCAL_BPF_PROG_MAX + 1] = {
+ [SEG6_LOCAL_BPF_PROG] = { .type = NLA_U32, },
+ [SEG6_LOCAL_BPF_PROG_NAME] = { .type = NLA_NUL_STRING,
+ .len = MAX_PROG_NAME },
+};
+
+static int parse_nla_bpf(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ struct nlattr *tb[SEG6_LOCAL_BPF_PROG_MAX + 1];
+ struct bpf_prog *p;
+ int ret;
+ u32 fd;
+
+ ret = nla_parse_nested(tb, SEG6_LOCAL_BPF_PROG_MAX,
+ attrs[SEG6_LOCAL_BPF], bpf_prog_policy, NULL);
+ if (ret < 0)
+ return ret;
+
+ if (!tb[SEG6_LOCAL_BPF_PROG] || !tb[SEG6_LOCAL_BPF_PROG_NAME])
+ return -EINVAL;
+
+ slwt->bpf.name = nla_memdup(tb[SEG6_LOCAL_BPF_PROG_NAME], GFP_KERNEL);
+ if (!slwt->bpf.name)
+ return -ENOMEM;
+
+ fd = nla_get_u32(tb[SEG6_LOCAL_BPF_PROG]);
+ p = bpf_prog_get_type(fd, BPF_PROG_TYPE_LWT_SEG6LOCAL);
+ if (IS_ERR(p)) {
+ kfree(slwt->bpf.name);
+ return PTR_ERR(p);
+ }
+
+ slwt->bpf.prog = p;
+ return 0;
+}
+
+static int put_nla_bpf(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct nlattr *nest;
+
+ if (!slwt->bpf.prog)
+ return 0;
+
+ nest = nla_nest_start(skb, SEG6_LOCAL_BPF);
+ if (!nest)
+ return -EMSGSIZE;
+
+ if (nla_put_u32(skb, SEG6_LOCAL_BPF_PROG, slwt->bpf.prog->aux->id))
+ return -EMSGSIZE;
+
+ if (slwt->bpf.name &&
+ nla_put_string(skb, SEG6_LOCAL_BPF_PROG_NAME, slwt->bpf.name))
+ return -EMSGSIZE;
+
+ return nla_nest_end(skb, nest);
+}
+
+static int cmp_nla_bpf(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ if (!a->bpf.name && !b->bpf.name)
+ return 0;
+
+ if (!a->bpf.name || !b->bpf.name)
+ return 1;
+
+ return strcmp(a->bpf.name, b->bpf.name);
+}
+
+struct seg6_action_param {
+ int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt);
+ int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
+ int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b);
+};
+
+static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = {
+ [SEG6_LOCAL_SRH] = { .parse = parse_nla_srh,
+ .put = put_nla_srh,
+ .cmp = cmp_nla_srh },
+
+ [SEG6_LOCAL_TABLE] = { .parse = parse_nla_table,
+ .put = put_nla_table,
+ .cmp = cmp_nla_table },
+
+ [SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4,
+ .put = put_nla_nh4,
+ .cmp = cmp_nla_nh4 },
+
+ [SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6,
+ .put = put_nla_nh6,
+ .cmp = cmp_nla_nh6 },
+
+ [SEG6_LOCAL_IIF] = { .parse = parse_nla_iif,
+ .put = put_nla_iif,
+ .cmp = cmp_nla_iif },
+
+ [SEG6_LOCAL_OIF] = { .parse = parse_nla_oif,
+ .put = put_nla_oif,
+ .cmp = cmp_nla_oif },
+
+ [SEG6_LOCAL_BPF] = { .parse = parse_nla_bpf,
+ .put = put_nla_bpf,
+ .cmp = cmp_nla_bpf },
+
+};
+
+static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ struct seg6_action_param *param;
+ struct seg6_action_desc *desc;
+ int i, err;
+
+ desc = __get_action_desc(slwt->action);
+ if (!desc)
+ return -EINVAL;
+
+ if (!desc->input)
+ return -EOPNOTSUPP;
+
+ slwt->desc = desc;
+ slwt->headroom += desc->static_headroom;
+
+ for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
+ if (desc->attrs & (1 << i)) {
+ if (!attrs[i])
+ return -EINVAL;
+
+ param = &seg6_action_params[i];
+
+ err = param->parse(attrs, slwt);
+ if (err < 0)
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int seg6_local_build_state(struct nlattr *nla, unsigned int family,
+ const void *cfg, struct lwtunnel_state **ts,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[SEG6_LOCAL_MAX + 1];
+ struct lwtunnel_state *newts;
+ struct seg6_local_lwt *slwt;
+ int err;
+
+ if (family != AF_INET6)
+ return -EINVAL;
+
+ err = nla_parse_nested(tb, SEG6_LOCAL_MAX, nla, seg6_local_policy,
+ extack);
+
+ if (err < 0)
+ return err;
+
+ if (!tb[SEG6_LOCAL_ACTION])
+ return -EINVAL;
+
+ newts = lwtunnel_state_alloc(sizeof(*slwt));
+ if (!newts)
+ return -ENOMEM;
+
+ slwt = seg6_local_lwtunnel(newts);
+ slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]);
+
+ err = parse_nla_action(tb, slwt);
+ if (err < 0)
+ goto out_free;
+
+ newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL;
+ newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT;
+ newts->headroom = slwt->headroom;
+
+ *ts = newts;
+
+ return 0;
+
+out_free:
+ kfree(slwt->srh);
+ kfree(newts);
+ return err;
+}
+
+static void seg6_local_destroy_state(struct lwtunnel_state *lwt)
+{
+ struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
+
+ kfree(slwt->srh);
+
+ if (slwt->desc->attrs & (1 << SEG6_LOCAL_BPF)) {
+ kfree(slwt->bpf.name);
+ bpf_prog_put(slwt->bpf.prog);
+ }
+
+ return;
+}
+
+static int seg6_local_fill_encap(struct sk_buff *skb,
+ struct lwtunnel_state *lwt)
+{
+ struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
+ struct seg6_action_param *param;
+ int i, err;
+
+ if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action))
+ return -EMSGSIZE;
+
+ for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
+ if (slwt->desc->attrs & (1 << i)) {
+ param = &seg6_action_params[i];
+ err = param->put(skb, slwt);
+ if (err < 0)
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int seg6_local_get_encap_size(struct lwtunnel_state *lwt)
+{
+ struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
+ unsigned long attrs;
+ int nlsize;
+
+ nlsize = nla_total_size(4); /* action */
+
+ attrs = slwt->desc->attrs;
+
+ if (attrs & (1 << SEG6_LOCAL_SRH))
+ nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3);
+
+ if (attrs & (1 << SEG6_LOCAL_TABLE))
+ nlsize += nla_total_size(4);
+
+ if (attrs & (1 << SEG6_LOCAL_NH4))
+ nlsize += nla_total_size(4);
+
+ if (attrs & (1 << SEG6_LOCAL_NH6))
+ nlsize += nla_total_size(16);
+
+ if (attrs & (1 << SEG6_LOCAL_IIF))
+ nlsize += nla_total_size(4);
+
+ if (attrs & (1 << SEG6_LOCAL_OIF))
+ nlsize += nla_total_size(4);
+
+ if (attrs & (1 << SEG6_LOCAL_BPF))
+ nlsize += nla_total_size(sizeof(struct nlattr)) +
+ nla_total_size(MAX_PROG_NAME) +
+ nla_total_size(4);
+
+ return nlsize;
+}
+
+static int seg6_local_cmp_encap(struct lwtunnel_state *a,
+ struct lwtunnel_state *b)
+{
+ struct seg6_local_lwt *slwt_a, *slwt_b;
+ struct seg6_action_param *param;
+ int i;
+
+ slwt_a = seg6_local_lwtunnel(a);
+ slwt_b = seg6_local_lwtunnel(b);
+
+ if (slwt_a->action != slwt_b->action)
+ return 1;
+
+ if (slwt_a->desc->attrs != slwt_b->desc->attrs)
+ return 1;
+
+ for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
+ if (slwt_a->desc->attrs & (1 << i)) {
+ param = &seg6_action_params[i];
+ if (param->cmp(slwt_a, slwt_b))
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static const struct lwtunnel_encap_ops seg6_local_ops = {
+ .build_state = seg6_local_build_state,
+ .destroy_state = seg6_local_destroy_state,
+ .input = seg6_local_input,
+ .fill_encap = seg6_local_fill_encap,
+ .get_encap_size = seg6_local_get_encap_size,
+ .cmp_encap = seg6_local_cmp_encap,
+ .owner = THIS_MODULE,
+};
+
+int __init seg6_local_init(void)
+{
+ return lwtunnel_encap_add_ops(&seg6_local_ops,
+ LWTUNNEL_ENCAP_SEG6_LOCAL);
+}
+
+void seg6_local_exit(void)
+{
+ lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL);
+}
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
new file mode 100644
index 0000000..e9400ff
--- /dev/null
+++ b/net/ipv6/sit.c
@@ -0,0 +1,1959 @@
+/*
+ * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Changes:
+ * Roger Venning <r.venning@telstra.com>: 6to4 support
+ * Nate Thompson <nate@thebog.net>: 6to4 support
+ * Fred Templin <fred.l.templin@boeing.com>: isatap support
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/icmp.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/init.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/if_ether.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/ip.h>
+#include <net/udp.h>
+#include <net/icmp.h>
+#include <net/ip_tunnels.h>
+#include <net/inet_ecn.h>
+#include <net/xfrm.h>
+#include <net/dsfield.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+/*
+ This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
+
+ For comments look at net/ipv4/ip_gre.c --ANK
+ */
+
+#define IP6_SIT_HASH_SIZE 16
+#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
+
+static bool log_ecn_error = true;
+module_param(log_ecn_error, bool, 0644);
+MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+
+static int ipip6_tunnel_init(struct net_device *dev);
+static void ipip6_tunnel_setup(struct net_device *dev);
+static void ipip6_dev_free(struct net_device *dev);
+static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
+ __be32 *v4dst);
+static struct rtnl_link_ops sit_link_ops __read_mostly;
+
+static unsigned int sit_net_id __read_mostly;
+struct sit_net {
+ struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE];
+ struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE];
+ struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE];
+ struct ip_tunnel __rcu *tunnels_wc[1];
+ struct ip_tunnel __rcu **tunnels[4];
+
+ struct net_device *fb_tunnel_dev;
+};
+
+/*
+ * Must be invoked with rcu_read_lock
+ */
+static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
+ struct net_device *dev,
+ __be32 remote, __be32 local,
+ int sifindex)
+{
+ unsigned int h0 = HASH(remote);
+ unsigned int h1 = HASH(local);
+ struct ip_tunnel *t;
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+ int ifindex = dev ? dev->ifindex : 0;
+
+ for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
+ if (local == t->parms.iph.saddr &&
+ remote == t->parms.iph.daddr &&
+ (!dev || !t->parms.link || ifindex == t->parms.link ||
+ sifindex == t->parms.link) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+ for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
+ if (remote == t->parms.iph.daddr &&
+ (!dev || !t->parms.link || ifindex == t->parms.link ||
+ sifindex == t->parms.link) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+ for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
+ if (local == t->parms.iph.saddr &&
+ (!dev || !t->parms.link || ifindex == t->parms.link ||
+ sifindex == t->parms.link) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+ t = rcu_dereference(sitn->tunnels_wc[0]);
+ if (t && (t->dev->flags & IFF_UP))
+ return t;
+ return NULL;
+}
+
+static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
+ struct ip_tunnel_parm *parms)
+{
+ __be32 remote = parms->iph.daddr;
+ __be32 local = parms->iph.saddr;
+ unsigned int h = 0;
+ int prio = 0;
+
+ if (remote) {
+ prio |= 2;
+ h ^= HASH(remote);
+ }
+ if (local) {
+ prio |= 1;
+ h ^= HASH(local);
+ }
+ return &sitn->tunnels[prio][h];
+}
+
+static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
+ struct ip_tunnel *t)
+{
+ return __ipip6_bucket(sitn, &t->parms);
+}
+
+static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
+{
+ struct ip_tunnel __rcu **tp;
+ struct ip_tunnel *iter;
+
+ for (tp = ipip6_bucket(sitn, t);
+ (iter = rtnl_dereference(*tp)) != NULL;
+ tp = &iter->next) {
+ if (t == iter) {
+ rcu_assign_pointer(*tp, t->next);
+ break;
+ }
+ }
+}
+
+static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
+{
+ struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
+
+ rcu_assign_pointer(t->next, rtnl_dereference(*tp));
+ rcu_assign_pointer(*tp, t);
+}
+
+static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
+{
+#ifdef CONFIG_IPV6_SIT_6RD
+ struct ip_tunnel *t = netdev_priv(dev);
+
+ if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) {
+ ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
+ t->ip6rd.relay_prefix = 0;
+ t->ip6rd.prefixlen = 16;
+ t->ip6rd.relay_prefixlen = 0;
+ } else {
+ struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
+ memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
+ }
+#endif
+}
+
+static int ipip6_tunnel_create(struct net_device *dev)
+{
+ struct ip_tunnel *t = netdev_priv(dev);
+ struct net *net = dev_net(dev);
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+ int err;
+
+ memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
+ memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
+
+ if ((__force u16)t->parms.i_flags & SIT_ISATAP)
+ dev->priv_flags |= IFF_ISATAP;
+
+ dev->rtnl_link_ops = &sit_link_ops;
+
+ err = register_netdevice(dev);
+ if (err < 0)
+ goto out;
+
+ ipip6_tunnel_clone_6rd(dev, sitn);
+
+ dev_hold(dev);
+
+ ipip6_tunnel_link(sitn, t);
+ return 0;
+
+out:
+ return err;
+}
+
+static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
+ struct ip_tunnel_parm *parms, int create)
+{
+ __be32 remote = parms->iph.daddr;
+ __be32 local = parms->iph.saddr;
+ struct ip_tunnel *t, *nt;
+ struct ip_tunnel __rcu **tp;
+ struct net_device *dev;
+ char name[IFNAMSIZ];
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+
+ for (tp = __ipip6_bucket(sitn, parms);
+ (t = rtnl_dereference(*tp)) != NULL;
+ tp = &t->next) {
+ if (local == t->parms.iph.saddr &&
+ remote == t->parms.iph.daddr &&
+ parms->link == t->parms.link) {
+ if (create)
+ return NULL;
+ else
+ return t;
+ }
+ }
+ if (!create)
+ goto failed;
+
+ if (parms->name[0]) {
+ if (!dev_valid_name(parms->name))
+ goto failed;
+ strlcpy(name, parms->name, IFNAMSIZ);
+ } else {
+ strcpy(name, "sit%d");
+ }
+ dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
+ ipip6_tunnel_setup);
+ if (!dev)
+ return NULL;
+
+ dev_net_set(dev, net);
+
+ nt = netdev_priv(dev);
+
+ nt->parms = *parms;
+ if (ipip6_tunnel_create(dev) < 0)
+ goto failed_free;
+
+ return nt;
+
+failed_free:
+ free_netdev(dev);
+failed:
+ return NULL;
+}
+
+#define for_each_prl_rcu(start) \
+ for (prl = rcu_dereference(start); \
+ prl; \
+ prl = rcu_dereference(prl->next))
+
+static struct ip_tunnel_prl_entry *
+__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
+{
+ struct ip_tunnel_prl_entry *prl;
+
+ for_each_prl_rcu(t->prl)
+ if (prl->addr == addr)
+ break;
+ return prl;
+
+}
+
+static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
+ struct ip_tunnel_prl __user *a)
+{
+ struct ip_tunnel_prl kprl, *kp;
+ struct ip_tunnel_prl_entry *prl;
+ unsigned int cmax, c = 0, ca, len;
+ int ret = 0;
+
+ if (copy_from_user(&kprl, a, sizeof(kprl)))
+ return -EFAULT;
+ cmax = kprl.datalen / sizeof(kprl);
+ if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
+ cmax = 1;
+
+ /* For simple GET or for root users,
+ * we try harder to allocate.
+ */
+ kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
+ kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) :
+ NULL;
+
+ rcu_read_lock();
+
+ ca = t->prl_count < cmax ? t->prl_count : cmax;
+
+ if (!kp) {
+ /* We don't try hard to allocate much memory for
+ * non-root users.
+ * For root users, retry allocating enough memory for
+ * the answer.
+ */
+ kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
+ if (!kp) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ }
+
+ c = 0;
+ for_each_prl_rcu(t->prl) {
+ if (c >= cmax)
+ break;
+ if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
+ continue;
+ kp[c].addr = prl->addr;
+ kp[c].flags = prl->flags;
+ c++;
+ if (kprl.addr != htonl(INADDR_ANY))
+ break;
+ }
+out:
+ rcu_read_unlock();
+
+ len = sizeof(*kp) * c;
+ ret = 0;
+ if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
+ ret = -EFAULT;
+
+ kfree(kp);
+
+ return ret;
+}
+
+static int
+ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
+{
+ struct ip_tunnel_prl_entry *p;
+ int err = 0;
+
+ if (a->addr == htonl(INADDR_ANY))
+ return -EINVAL;
+
+ ASSERT_RTNL();
+
+ for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
+ if (p->addr == a->addr) {
+ if (chg) {
+ p->flags = a->flags;
+ goto out;
+ }
+ err = -EEXIST;
+ goto out;
+ }
+ }
+
+ if (chg) {
+ err = -ENXIO;
+ goto out;
+ }
+
+ p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
+ if (!p) {
+ err = -ENOBUFS;
+ goto out;
+ }
+
+ p->next = t->prl;
+ p->addr = a->addr;
+ p->flags = a->flags;
+ t->prl_count++;
+ rcu_assign_pointer(t->prl, p);
+out:
+ return err;
+}
+
+static void prl_list_destroy_rcu(struct rcu_head *head)
+{
+ struct ip_tunnel_prl_entry *p, *n;
+
+ p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
+ do {
+ n = rcu_dereference_protected(p->next, 1);
+ kfree(p);
+ p = n;
+ } while (p);
+}
+
+static int
+ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
+{
+ struct ip_tunnel_prl_entry *x;
+ struct ip_tunnel_prl_entry __rcu **p;
+ int err = 0;
+
+ ASSERT_RTNL();
+
+ if (a && a->addr != htonl(INADDR_ANY)) {
+ for (p = &t->prl;
+ (x = rtnl_dereference(*p)) != NULL;
+ p = &x->next) {
+ if (x->addr == a->addr) {
+ *p = x->next;
+ kfree_rcu(x, rcu_head);
+ t->prl_count--;
+ goto out;
+ }
+ }
+ err = -ENXIO;
+ } else {
+ x = rtnl_dereference(t->prl);
+ if (x) {
+ t->prl_count = 0;
+ call_rcu(&x->rcu_head, prl_list_destroy_rcu);
+ t->prl = NULL;
+ }
+ }
+out:
+ return err;
+}
+
+static int
+isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
+{
+ struct ip_tunnel_prl_entry *p;
+ int ok = 1;
+
+ rcu_read_lock();
+ p = __ipip6_tunnel_locate_prl(t, iph->saddr);
+ if (p) {
+ if (p->flags & PRL_DEFAULT)
+ skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
+ else
+ skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
+ } else {
+ const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
+
+ if (ipv6_addr_is_isatap(addr6) &&
+ (addr6->s6_addr32[3] == iph->saddr) &&
+ ipv6_chk_prefix(addr6, t->dev))
+ skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
+ else
+ ok = 0;
+ }
+ rcu_read_unlock();
+ return ok;
+}
+
+static void ipip6_tunnel_uninit(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
+
+ if (dev == sitn->fb_tunnel_dev) {
+ RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
+ } else {
+ ipip6_tunnel_unlink(sitn, tunnel);
+ ipip6_tunnel_del_prl(tunnel, NULL);
+ }
+ dst_cache_reset(&tunnel->dst_cache);
+ dev_put(dev);
+}
+
+static int ipip6_err(struct sk_buff *skb, u32 info)
+{
+ const struct iphdr *iph = (const struct iphdr *)skb->data;
+ const int type = icmp_hdr(skb)->type;
+ const int code = icmp_hdr(skb)->code;
+ unsigned int data_len = 0;
+ struct ip_tunnel *t;
+ int sifindex;
+ int err;
+
+ switch (type) {
+ default:
+ case ICMP_PARAMETERPROB:
+ return 0;
+
+ case ICMP_DEST_UNREACH:
+ switch (code) {
+ case ICMP_SR_FAILED:
+ /* Impossible event. */
+ return 0;
+ default:
+ /* All others are translated to HOST_UNREACH.
+ rfc2003 contains "deep thoughts" about NET_UNREACH,
+ I believe they are just ether pollution. --ANK
+ */
+ break;
+ }
+ break;
+ case ICMP_TIME_EXCEEDED:
+ if (code != ICMP_EXC_TTL)
+ return 0;
+ data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
+ break;
+ case ICMP_REDIRECT:
+ break;
+ }
+
+ err = -ENOENT;
+
+ sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
+ t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
+ iph->daddr, iph->saddr, sifindex);
+ if (!t)
+ goto out;
+
+ if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
+ ipv4_update_pmtu(skb, dev_net(skb->dev), info,
+ t->parms.link, 0, iph->protocol, 0);
+ err = 0;
+ goto out;
+ }
+ if (type == ICMP_REDIRECT) {
+ ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
+ iph->protocol, 0);
+ err = 0;
+ goto out;
+ }
+
+ err = 0;
+ if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len))
+ goto out;
+
+ if (t->parms.iph.daddr == 0)
+ goto out;
+
+ if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
+ goto out;
+
+ if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
+ t->err_count++;
+ else
+ t->err_count = 1;
+ t->err_time = jiffies;
+out:
+ return err;
+}
+
+static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
+ const struct in6_addr *v6addr)
+{
+ __be32 v4embed = 0;
+ if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
+ return true;
+ return false;
+}
+
+/* Checks if an address matches an address on the tunnel interface.
+ * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
+ * Long story:
+ * This function is called after we considered the packet as spoofed
+ * in is_spoofed_6rd.
+ * We may have a router that is doing NAT for proto 41 packets
+ * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
+ * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
+ * function will return true, dropping the packet.
+ * But, we can still check if is spoofed against the IP
+ * addresses associated with the interface.
+ */
+static bool only_dnatted(const struct ip_tunnel *tunnel,
+ const struct in6_addr *v6dst)
+{
+ int prefix_len;
+
+#ifdef CONFIG_IPV6_SIT_6RD
+ prefix_len = tunnel->ip6rd.prefixlen + 32
+ - tunnel->ip6rd.relay_prefixlen;
+#else
+ prefix_len = 48;
+#endif
+ return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
+}
+
+/* Returns true if a packet is spoofed */
+static bool packet_is_spoofed(struct sk_buff *skb,
+ const struct iphdr *iph,
+ struct ip_tunnel *tunnel)
+{
+ const struct ipv6hdr *ipv6h;
+
+ if (tunnel->dev->priv_flags & IFF_ISATAP) {
+ if (!isatap_chksrc(skb, iph, tunnel))
+ return true;
+
+ return false;
+ }
+
+ if (tunnel->dev->flags & IFF_POINTOPOINT)
+ return false;
+
+ ipv6h = ipv6_hdr(skb);
+
+ if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
+ net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
+ &iph->saddr, &ipv6h->saddr,
+ &iph->daddr, &ipv6h->daddr);
+ return true;
+ }
+
+ if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
+ return false;
+
+ if (only_dnatted(tunnel, &ipv6h->daddr))
+ return false;
+
+ net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
+ &iph->saddr, &ipv6h->saddr,
+ &iph->daddr, &ipv6h->daddr);
+ return true;
+}
+
+static int ipip6_rcv(struct sk_buff *skb)
+{
+ const struct iphdr *iph = ip_hdr(skb);
+ struct ip_tunnel *tunnel;
+ int sifindex;
+ int err;
+
+ sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
+ tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
+ iph->saddr, iph->daddr, sifindex);
+ if (tunnel) {
+ struct pcpu_sw_netstats *tstats;
+
+ if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
+ tunnel->parms.iph.protocol != 0)
+ goto out;
+
+ skb->mac_header = skb->network_header;
+ skb_reset_network_header(skb);
+ IPCB(skb)->flags = 0;
+ skb->dev = tunnel->dev;
+
+ if (packet_is_spoofed(skb, iph, tunnel)) {
+ tunnel->dev->stats.rx_errors++;
+ goto out;
+ }
+
+ if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
+ !net_eq(tunnel->net, dev_net(tunnel->dev))))
+ goto out;
+
+ err = IP_ECN_decapsulate(iph, skb);
+ if (unlikely(err)) {
+ if (log_ecn_error)
+ net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
+ &iph->saddr, iph->tos);
+ if (err > 1) {
+ ++tunnel->dev->stats.rx_frame_errors;
+ ++tunnel->dev->stats.rx_errors;
+ goto out;
+ }
+ }
+
+ tstats = this_cpu_ptr(tunnel->dev->tstats);
+ u64_stats_update_begin(&tstats->syncp);
+ tstats->rx_packets++;
+ tstats->rx_bytes += skb->len;
+ u64_stats_update_end(&tstats->syncp);
+
+ netif_rx(skb);
+
+ return 0;
+ }
+
+ /* no tunnel matched, let upstream know, ipsec may handle it */
+ return 1;
+out:
+ kfree_skb(skb);
+ return 0;
+}
+
+static const struct tnl_ptk_info ipip_tpi = {
+ /* no tunnel info required for ipip. */
+ .proto = htons(ETH_P_IP),
+};
+
+#if IS_ENABLED(CONFIG_MPLS)
+static const struct tnl_ptk_info mplsip_tpi = {
+ /* no tunnel info required for mplsip. */
+ .proto = htons(ETH_P_MPLS_UC),
+};
+#endif
+
+static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
+{
+ const struct iphdr *iph;
+ struct ip_tunnel *tunnel;
+ int sifindex;
+
+ sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
+
+ iph = ip_hdr(skb);
+ tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
+ iph->saddr, iph->daddr, sifindex);
+ if (tunnel) {
+ const struct tnl_ptk_info *tpi;
+
+ if (tunnel->parms.iph.protocol != ipproto &&
+ tunnel->parms.iph.protocol != 0)
+ goto drop;
+
+ if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
+ goto drop;
+#if IS_ENABLED(CONFIG_MPLS)
+ if (ipproto == IPPROTO_MPLS)
+ tpi = &mplsip_tpi;
+ else
+#endif
+ tpi = &ipip_tpi;
+ if (iptunnel_pull_header(skb, 0, tpi->proto, false))
+ goto drop;
+ return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
+ }
+
+ return 1;
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int ipip_rcv(struct sk_buff *skb)
+{
+ return sit_tunnel_rcv(skb, IPPROTO_IPIP);
+}
+
+#if IS_ENABLED(CONFIG_MPLS)
+static int mplsip_rcv(struct sk_buff *skb)
+{
+ return sit_tunnel_rcv(skb, IPPROTO_MPLS);
+}
+#endif
+
+/*
+ * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
+ * stores the embedded IPv4 address in v4dst and returns true.
+ */
+static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
+ __be32 *v4dst)
+{
+#ifdef CONFIG_IPV6_SIT_6RD
+ if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
+ tunnel->ip6rd.prefixlen)) {
+ unsigned int pbw0, pbi0;
+ int pbi1;
+ u32 d;
+
+ pbw0 = tunnel->ip6rd.prefixlen >> 5;
+ pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
+
+ d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
+ tunnel->ip6rd.relay_prefixlen;
+
+ pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
+ if (pbi1 > 0)
+ d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
+ (32 - pbi1);
+
+ *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
+ return true;
+ }
+#else
+ if (v6dst->s6_addr16[0] == htons(0x2002)) {
+ /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
+ memcpy(v4dst, &v6dst->s6_addr16[1], 4);
+ return true;
+ }
+#endif
+ return false;
+}
+
+static inline __be32 try_6rd(struct ip_tunnel *tunnel,
+ const struct in6_addr *v6dst)
+{
+ __be32 dst = 0;
+ check_6rd(tunnel, v6dst, &dst);
+ return dst;
+}
+
+/*
+ * This function assumes it is being called from dev_queue_xmit()
+ * and that skb is filled properly by that function.
+ */
+
+static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ const struct iphdr *tiph = &tunnel->parms.iph;
+ const struct ipv6hdr *iph6 = ipv6_hdr(skb);
+ u8 tos = tunnel->parms.iph.tos;
+ __be16 df = tiph->frag_off;
+ struct rtable *rt; /* Route to the other host */
+ struct net_device *tdev; /* Device to other host */
+ unsigned int max_headroom; /* The extra header space needed */
+ __be32 dst = tiph->daddr;
+ struct flowi4 fl4;
+ int mtu;
+ const struct in6_addr *addr6;
+ int addr_type;
+ u8 ttl;
+ u8 protocol = IPPROTO_IPV6;
+ int t_hlen = tunnel->hlen + sizeof(struct iphdr);
+
+ if (tos == 1)
+ tos = ipv6_get_dsfield(iph6);
+
+ /* ISATAP (RFC4214) - must come before 6to4 */
+ if (dev->priv_flags & IFF_ISATAP) {
+ struct neighbour *neigh = NULL;
+ bool do_tx_error = false;
+
+ if (skb_dst(skb))
+ neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
+
+ if (!neigh) {
+ net_dbg_ratelimited("nexthop == NULL\n");
+ goto tx_error;
+ }
+
+ addr6 = (const struct in6_addr *)&neigh->primary_key;
+ addr_type = ipv6_addr_type(addr6);
+
+ if ((addr_type & IPV6_ADDR_UNICAST) &&
+ ipv6_addr_is_isatap(addr6))
+ dst = addr6->s6_addr32[3];
+ else
+ do_tx_error = true;
+
+ neigh_release(neigh);
+ if (do_tx_error)
+ goto tx_error;
+ }
+
+ if (!dst)
+ dst = try_6rd(tunnel, &iph6->daddr);
+
+ if (!dst) {
+ struct neighbour *neigh = NULL;
+ bool do_tx_error = false;
+
+ if (skb_dst(skb))
+ neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
+
+ if (!neigh) {
+ net_dbg_ratelimited("nexthop == NULL\n");
+ goto tx_error;
+ }
+
+ addr6 = (const struct in6_addr *)&neigh->primary_key;
+ addr_type = ipv6_addr_type(addr6);
+
+ if (addr_type == IPV6_ADDR_ANY) {
+ addr6 = &ipv6_hdr(skb)->daddr;
+ addr_type = ipv6_addr_type(addr6);
+ }
+
+ if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
+ dst = addr6->s6_addr32[3];
+ else
+ do_tx_error = true;
+
+ neigh_release(neigh);
+ if (do_tx_error)
+ goto tx_error;
+ }
+
+ flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark,
+ RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6,
+ 0, dst, tiph->saddr, 0, 0,
+ sock_net_uid(tunnel->net, NULL));
+ rt = ip_route_output_flow(tunnel->net, &fl4, NULL);
+
+ if (IS_ERR(rt)) {
+ dev->stats.tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+ if (rt->rt_type != RTN_UNICAST) {
+ ip_rt_put(rt);
+ dev->stats.tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+ tdev = rt->dst.dev;
+
+ if (tdev == dev) {
+ ip_rt_put(rt);
+ dev->stats.collisions++;
+ goto tx_error;
+ }
+
+ if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) {
+ ip_rt_put(rt);
+ goto tx_error;
+ }
+
+ if (df) {
+ mtu = dst_mtu(&rt->dst) - t_hlen;
+
+ if (mtu < 68) {
+ dev->stats.collisions++;
+ ip_rt_put(rt);
+ goto tx_error;
+ }
+
+ if (mtu < IPV6_MIN_MTU) {
+ mtu = IPV6_MIN_MTU;
+ df = 0;
+ }
+
+ if (tunnel->parms.iph.daddr)
+ skb_dst_update_pmtu(skb, mtu);
+
+ if (skb->len > mtu && !skb_is_gso(skb)) {
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ ip_rt_put(rt);
+ goto tx_error;
+ }
+ }
+
+ if (tunnel->err_count > 0) {
+ if (time_before(jiffies,
+ tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
+ tunnel->err_count--;
+ dst_link_failure(skb);
+ } else
+ tunnel->err_count = 0;
+ }
+
+ /*
+ * Okay, now see if we can stuff it in the buffer as-is.
+ */
+ max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;
+
+ if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
+ (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
+ struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
+ if (!new_skb) {
+ ip_rt_put(rt);
+ dev->stats.tx_dropped++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ if (skb->sk)
+ skb_set_owner_w(new_skb, skb->sk);
+ dev_kfree_skb(skb);
+ skb = new_skb;
+ iph6 = ipv6_hdr(skb);
+ }
+ ttl = tiph->ttl;
+ if (ttl == 0)
+ ttl = iph6->hop_limit;
+ tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
+
+ if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
+ ip_rt_put(rt);
+ goto tx_error;
+ }
+
+ skb_set_inner_ipproto(skb, IPPROTO_IPV6);
+
+ iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
+ df, !net_eq(tunnel->net, dev_net(dev)));
+ return NETDEV_TX_OK;
+
+tx_error_icmp:
+ dst_link_failure(skb);
+tx_error:
+ kfree_skb(skb);
+ dev->stats.tx_errors++;
+ return NETDEV_TX_OK;
+}
+
+static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb,
+ struct net_device *dev, u8 ipproto)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ const struct iphdr *tiph = &tunnel->parms.iph;
+
+ if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
+ goto tx_error;
+
+ skb_set_inner_ipproto(skb, ipproto);
+
+ ip_tunnel_xmit(skb, dev, tiph, ipproto);
+ return NETDEV_TX_OK;
+tx_error:
+ kfree_skb(skb);
+ dev->stats.tx_errors++;
+ return NETDEV_TX_OK;
+}
+
+static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP);
+ break;
+ case htons(ETH_P_IPV6):
+ ipip6_tunnel_xmit(skb, dev);
+ break;
+#if IS_ENABLED(CONFIG_MPLS)
+ case htons(ETH_P_MPLS_UC):
+ sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS);
+ break;
+#endif
+ default:
+ goto tx_err;
+ }
+
+ return NETDEV_TX_OK;
+
+tx_err:
+ dev->stats.tx_errors++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+
+}
+
+static void ipip6_tunnel_bind_dev(struct net_device *dev)
+{
+ struct net_device *tdev = NULL;
+ struct ip_tunnel *tunnel;
+ const struct iphdr *iph;
+ struct flowi4 fl4;
+
+ tunnel = netdev_priv(dev);
+ iph = &tunnel->parms.iph;
+
+ if (iph->daddr) {
+ struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
+ NULL,
+ iph->daddr, iph->saddr,
+ 0, 0,
+ IPPROTO_IPV6,
+ RT_TOS(iph->tos),
+ tunnel->parms.link);
+
+ if (!IS_ERR(rt)) {
+ tdev = rt->dst.dev;
+ ip_rt_put(rt);
+ }
+ dev->flags |= IFF_POINTOPOINT;
+ }
+
+ if (!tdev && tunnel->parms.link)
+ tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
+
+ if (tdev) {
+ int t_hlen = tunnel->hlen + sizeof(struct iphdr);
+
+ dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
+ dev->mtu = tdev->mtu - t_hlen;
+ if (dev->mtu < IPV6_MIN_MTU)
+ dev->mtu = IPV6_MIN_MTU;
+ }
+}
+
+static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p,
+ __u32 fwmark)
+{
+ struct net *net = t->net;
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+
+ ipip6_tunnel_unlink(sitn, t);
+ synchronize_net();
+ t->parms.iph.saddr = p->iph.saddr;
+ t->parms.iph.daddr = p->iph.daddr;
+ memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
+ memcpy(t->dev->broadcast, &p->iph.daddr, 4);
+ ipip6_tunnel_link(sitn, t);
+ t->parms.iph.ttl = p->iph.ttl;
+ t->parms.iph.tos = p->iph.tos;
+ t->parms.iph.frag_off = p->iph.frag_off;
+ if (t->parms.link != p->link || t->fwmark != fwmark) {
+ t->parms.link = p->link;
+ t->fwmark = fwmark;
+ ipip6_tunnel_bind_dev(t->dev);
+ }
+ dst_cache_reset(&t->dst_cache);
+ netdev_state_change(t->dev);
+}
+
+#ifdef CONFIG_IPV6_SIT_6RD
+static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
+ struct ip_tunnel_6rd *ip6rd)
+{
+ struct in6_addr prefix;
+ __be32 relay_prefix;
+
+ if (ip6rd->relay_prefixlen > 32 ||
+ ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
+ return -EINVAL;
+
+ ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
+ if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
+ return -EINVAL;
+ if (ip6rd->relay_prefixlen)
+ relay_prefix = ip6rd->relay_prefix &
+ htonl(0xffffffffUL <<
+ (32 - ip6rd->relay_prefixlen));
+ else
+ relay_prefix = 0;
+ if (relay_prefix != ip6rd->relay_prefix)
+ return -EINVAL;
+
+ t->ip6rd.prefix = prefix;
+ t->ip6rd.relay_prefix = relay_prefix;
+ t->ip6rd.prefixlen = ip6rd->prefixlen;
+ t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
+ dst_cache_reset(&t->dst_cache);
+ netdev_state_change(t->dev);
+ return 0;
+}
+#endif
+
+static bool ipip6_valid_ip_proto(u8 ipproto)
+{
+ return ipproto == IPPROTO_IPV6 ||
+ ipproto == IPPROTO_IPIP ||
+#if IS_ENABLED(CONFIG_MPLS)
+ ipproto == IPPROTO_MPLS ||
+#endif
+ ipproto == 0;
+}
+
+static int
+ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ int err = 0;
+ struct ip_tunnel_parm p;
+ struct ip_tunnel_prl prl;
+ struct ip_tunnel *t = netdev_priv(dev);
+ struct net *net = t->net;
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+#ifdef CONFIG_IPV6_SIT_6RD
+ struct ip_tunnel_6rd ip6rd;
+#endif
+
+ switch (cmd) {
+ case SIOCGETTUNNEL:
+#ifdef CONFIG_IPV6_SIT_6RD
+ case SIOCGET6RD:
+#endif
+ if (dev == sitn->fb_tunnel_dev) {
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
+ err = -EFAULT;
+ break;
+ }
+ t = ipip6_tunnel_locate(net, &p, 0);
+ if (!t)
+ t = netdev_priv(dev);
+ }
+
+ err = -EFAULT;
+ if (cmd == SIOCGETTUNNEL) {
+ memcpy(&p, &t->parms, sizeof(p));
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
+ sizeof(p)))
+ goto done;
+#ifdef CONFIG_IPV6_SIT_6RD
+ } else {
+ ip6rd.prefix = t->ip6rd.prefix;
+ ip6rd.relay_prefix = t->ip6rd.relay_prefix;
+ ip6rd.prefixlen = t->ip6rd.prefixlen;
+ ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
+ sizeof(ip6rd)))
+ goto done;
+#endif
+ }
+ err = 0;
+ break;
+
+ case SIOCADDTUNNEL:
+ case SIOCCHGTUNNEL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ goto done;
+
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ goto done;
+
+ err = -EINVAL;
+ if (!ipip6_valid_ip_proto(p.iph.protocol))
+ goto done;
+ if (p.iph.version != 4 ||
+ p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
+ goto done;
+ if (p.iph.ttl)
+ p.iph.frag_off |= htons(IP_DF);
+
+ t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
+
+ if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
+ if (t) {
+ if (t->dev != dev) {
+ err = -EEXIST;
+ break;
+ }
+ } else {
+ if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
+ (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
+ err = -EINVAL;
+ break;
+ }
+ t = netdev_priv(dev);
+ }
+
+ ipip6_tunnel_update(t, &p, t->fwmark);
+ }
+
+ if (t) {
+ err = 0;
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
+ err = -EFAULT;
+ } else
+ err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
+ break;
+
+ case SIOCDELTUNNEL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ goto done;
+
+ if (dev == sitn->fb_tunnel_dev) {
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ goto done;
+ err = -ENOENT;
+ t = ipip6_tunnel_locate(net, &p, 0);
+ if (!t)
+ goto done;
+ err = -EPERM;
+ if (t == netdev_priv(sitn->fb_tunnel_dev))
+ goto done;
+ dev = t->dev;
+ }
+ unregister_netdevice(dev);
+ err = 0;
+ break;
+
+ case SIOCGETPRL:
+ err = -EINVAL;
+ if (dev == sitn->fb_tunnel_dev)
+ goto done;
+ err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
+ break;
+
+ case SIOCADDPRL:
+ case SIOCDELPRL:
+ case SIOCCHGPRL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ goto done;
+ err = -EINVAL;
+ if (dev == sitn->fb_tunnel_dev)
+ goto done;
+ err = -EFAULT;
+ if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
+ goto done;
+
+ switch (cmd) {
+ case SIOCDELPRL:
+ err = ipip6_tunnel_del_prl(t, &prl);
+ break;
+ case SIOCADDPRL:
+ case SIOCCHGPRL:
+ err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
+ break;
+ }
+ dst_cache_reset(&t->dst_cache);
+ netdev_state_change(dev);
+ break;
+
+#ifdef CONFIG_IPV6_SIT_6RD
+ case SIOCADD6RD:
+ case SIOCCHG6RD:
+ case SIOCDEL6RD:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ goto done;
+
+ err = -EFAULT;
+ if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
+ sizeof(ip6rd)))
+ goto done;
+
+ if (cmd != SIOCDEL6RD) {
+ err = ipip6_tunnel_update_6rd(t, &ip6rd);
+ if (err < 0)
+ goto done;
+ } else
+ ipip6_tunnel_clone_6rd(dev, sitn);
+
+ err = 0;
+ break;
+#endif
+
+ default:
+ err = -EINVAL;
+ }
+
+done:
+ return err;
+}
+
+static const struct net_device_ops ipip6_netdev_ops = {
+ .ndo_init = ipip6_tunnel_init,
+ .ndo_uninit = ipip6_tunnel_uninit,
+ .ndo_start_xmit = sit_tunnel_xmit,
+ .ndo_do_ioctl = ipip6_tunnel_ioctl,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
+ .ndo_get_iflink = ip_tunnel_get_iflink,
+};
+
+static void ipip6_dev_free(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+
+ dst_cache_destroy(&tunnel->dst_cache);
+ free_percpu(dev->tstats);
+}
+
+#define SIT_FEATURES (NETIF_F_SG | \
+ NETIF_F_FRAGLIST | \
+ NETIF_F_HIGHDMA | \
+ NETIF_F_GSO_SOFTWARE | \
+ NETIF_F_HW_CSUM)
+
+static void ipip6_tunnel_setup(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ int t_hlen = tunnel->hlen + sizeof(struct iphdr);
+
+ dev->netdev_ops = &ipip6_netdev_ops;
+ dev->needs_free_netdev = true;
+ dev->priv_destructor = ipip6_dev_free;
+
+ dev->type = ARPHRD_SIT;
+ dev->hard_header_len = LL_MAX_HEADER + t_hlen;
+ dev->mtu = ETH_DATA_LEN - t_hlen;
+ dev->min_mtu = IPV6_MIN_MTU;
+ dev->max_mtu = IP6_MAX_MTU - t_hlen;
+ dev->flags = IFF_NOARP;
+ netif_keep_dst(dev);
+ dev->addr_len = 4;
+ dev->features |= NETIF_F_LLTX;
+ dev->features |= SIT_FEATURES;
+ dev->hw_features |= SIT_FEATURES;
+}
+
+static int ipip6_tunnel_init(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ int err;
+
+ tunnel->dev = dev;
+ tunnel->net = dev_net(dev);
+ strcpy(tunnel->parms.name, dev->name);
+
+ ipip6_tunnel_bind_dev(dev);
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
+ if (err) {
+ free_percpu(dev->tstats);
+ dev->tstats = NULL;
+ return err;
+ }
+
+ return 0;
+}
+
+static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct iphdr *iph = &tunnel->parms.iph;
+ struct net *net = dev_net(dev);
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+
+ iph->version = 4;
+ iph->protocol = IPPROTO_IPV6;
+ iph->ihl = 5;
+ iph->ttl = 64;
+
+ dev_hold(dev);
+ rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
+}
+
+static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ u8 proto;
+
+ if (!data || !data[IFLA_IPTUN_PROTO])
+ return 0;
+
+ proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+ if (!ipip6_valid_ip_proto(proto))
+ return -EINVAL;
+
+ return 0;
+}
+
+static void ipip6_netlink_parms(struct nlattr *data[],
+ struct ip_tunnel_parm *parms,
+ __u32 *fwmark)
+{
+ memset(parms, 0, sizeof(*parms));
+
+ parms->iph.version = 4;
+ parms->iph.protocol = IPPROTO_IPV6;
+ parms->iph.ihl = 5;
+ parms->iph.ttl = 64;
+
+ if (!data)
+ return;
+
+ if (data[IFLA_IPTUN_LINK])
+ parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
+
+ if (data[IFLA_IPTUN_LOCAL])
+ parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
+
+ if (data[IFLA_IPTUN_REMOTE])
+ parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
+
+ if (data[IFLA_IPTUN_TTL]) {
+ parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
+ if (parms->iph.ttl)
+ parms->iph.frag_off = htons(IP_DF);
+ }
+
+ if (data[IFLA_IPTUN_TOS])
+ parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
+
+ if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
+ parms->iph.frag_off = htons(IP_DF);
+
+ if (data[IFLA_IPTUN_FLAGS])
+ parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
+
+ if (data[IFLA_IPTUN_PROTO])
+ parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+
+ if (data[IFLA_IPTUN_FWMARK])
+ *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
+}
+
+/* This function returns true when ENCAP attributes are present in the nl msg */
+static bool ipip6_netlink_encap_parms(struct nlattr *data[],
+ struct ip_tunnel_encap *ipencap)
+{
+ bool ret = false;
+
+ memset(ipencap, 0, sizeof(*ipencap));
+
+ if (!data)
+ return ret;
+
+ if (data[IFLA_IPTUN_ENCAP_TYPE]) {
+ ret = true;
+ ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
+ }
+
+ if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
+ ret = true;
+ ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
+ }
+
+ if (data[IFLA_IPTUN_ENCAP_SPORT]) {
+ ret = true;
+ ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
+ }
+
+ if (data[IFLA_IPTUN_ENCAP_DPORT]) {
+ ret = true;
+ ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
+ }
+
+ return ret;
+}
+
+#ifdef CONFIG_IPV6_SIT_6RD
+/* This function returns true when 6RD attributes are present in the nl msg */
+static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
+ struct ip_tunnel_6rd *ip6rd)
+{
+ bool ret = false;
+ memset(ip6rd, 0, sizeof(*ip6rd));
+
+ if (!data)
+ return ret;
+
+ if (data[IFLA_IPTUN_6RD_PREFIX]) {
+ ret = true;
+ ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]);
+ }
+
+ if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
+ ret = true;
+ ip6rd->relay_prefix =
+ nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
+ }
+
+ if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
+ ret = true;
+ ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
+ }
+
+ if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
+ ret = true;
+ ip6rd->relay_prefixlen =
+ nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
+ }
+
+ return ret;
+}
+#endif
+
+static int ipip6_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = dev_net(dev);
+ struct ip_tunnel *nt;
+ struct ip_tunnel_encap ipencap;
+#ifdef CONFIG_IPV6_SIT_6RD
+ struct ip_tunnel_6rd ip6rd;
+#endif
+ int err;
+
+ nt = netdev_priv(dev);
+
+ if (ipip6_netlink_encap_parms(data, &ipencap)) {
+ err = ip_tunnel_encap_setup(nt, &ipencap);
+ if (err < 0)
+ return err;
+ }
+
+ ipip6_netlink_parms(data, &nt->parms, &nt->fwmark);
+
+ if (ipip6_tunnel_locate(net, &nt->parms, 0))
+ return -EEXIST;
+
+ err = ipip6_tunnel_create(dev);
+ if (err < 0)
+ return err;
+
+ if (tb[IFLA_MTU]) {
+ u32 mtu = nla_get_u32(tb[IFLA_MTU]);
+
+ if (mtu >= IPV6_MIN_MTU &&
+ mtu <= IP6_MAX_MTU - dev->hard_header_len)
+ dev->mtu = mtu;
+ }
+
+#ifdef CONFIG_IPV6_SIT_6RD
+ if (ipip6_netlink_6rd_parms(data, &ip6rd))
+ err = ipip6_tunnel_update_6rd(nt, &ip6rd);
+#endif
+
+ return err;
+}
+
+static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct ip_tunnel *t = netdev_priv(dev);
+ struct ip_tunnel_parm p;
+ struct ip_tunnel_encap ipencap;
+ struct net *net = t->net;
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+#ifdef CONFIG_IPV6_SIT_6RD
+ struct ip_tunnel_6rd ip6rd;
+#endif
+ __u32 fwmark = t->fwmark;
+ int err;
+
+ if (dev == sitn->fb_tunnel_dev)
+ return -EINVAL;
+
+ if (ipip6_netlink_encap_parms(data, &ipencap)) {
+ err = ip_tunnel_encap_setup(t, &ipencap);
+ if (err < 0)
+ return err;
+ }
+
+ ipip6_netlink_parms(data, &p, &fwmark);
+
+ if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
+ (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
+ return -EINVAL;
+
+ t = ipip6_tunnel_locate(net, &p, 0);
+
+ if (t) {
+ if (t->dev != dev)
+ return -EEXIST;
+ } else
+ t = netdev_priv(dev);
+
+ ipip6_tunnel_update(t, &p, fwmark);
+
+#ifdef CONFIG_IPV6_SIT_6RD
+ if (ipip6_netlink_6rd_parms(data, &ip6rd))
+ return ipip6_tunnel_update_6rd(t, &ip6rd);
+#endif
+
+ return 0;
+}
+
+static size_t ipip6_get_size(const struct net_device *dev)
+{
+ return
+ /* IFLA_IPTUN_LINK */
+ nla_total_size(4) +
+ /* IFLA_IPTUN_LOCAL */
+ nla_total_size(4) +
+ /* IFLA_IPTUN_REMOTE */
+ nla_total_size(4) +
+ /* IFLA_IPTUN_TTL */
+ nla_total_size(1) +
+ /* IFLA_IPTUN_TOS */
+ nla_total_size(1) +
+ /* IFLA_IPTUN_PMTUDISC */
+ nla_total_size(1) +
+ /* IFLA_IPTUN_FLAGS */
+ nla_total_size(2) +
+ /* IFLA_IPTUN_PROTO */
+ nla_total_size(1) +
+#ifdef CONFIG_IPV6_SIT_6RD
+ /* IFLA_IPTUN_6RD_PREFIX */
+ nla_total_size(sizeof(struct in6_addr)) +
+ /* IFLA_IPTUN_6RD_RELAY_PREFIX */
+ nla_total_size(4) +
+ /* IFLA_IPTUN_6RD_PREFIXLEN */
+ nla_total_size(2) +
+ /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
+ nla_total_size(2) +
+#endif
+ /* IFLA_IPTUN_ENCAP_TYPE */
+ nla_total_size(2) +
+ /* IFLA_IPTUN_ENCAP_FLAGS */
+ nla_total_size(2) +
+ /* IFLA_IPTUN_ENCAP_SPORT */
+ nla_total_size(2) +
+ /* IFLA_IPTUN_ENCAP_DPORT */
+ nla_total_size(2) +
+ /* IFLA_IPTUN_FWMARK */
+ nla_total_size(4) +
+ 0;
+}
+
+static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct ip_tunnel_parm *parm = &tunnel->parms;
+
+ if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
+ nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
+ nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
+ nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
+ nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
+ nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
+ !!(parm->iph.frag_off & htons(IP_DF))) ||
+ nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
+ nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) ||
+ nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
+ goto nla_put_failure;
+
+#ifdef CONFIG_IPV6_SIT_6RD
+ if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX,
+ &tunnel->ip6rd.prefix) ||
+ nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
+ tunnel->ip6rd.relay_prefix) ||
+ nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
+ tunnel->ip6rd.prefixlen) ||
+ nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
+ tunnel->ip6rd.relay_prefixlen))
+ goto nla_put_failure;
+#endif
+
+ if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
+ tunnel->encap.type) ||
+ nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
+ tunnel->encap.sport) ||
+ nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
+ tunnel->encap.dport) ||
+ nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
+ tunnel->encap.flags))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
+ [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
+ [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
+ [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
+ [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
+ [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
+ [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
+ [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
+ [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
+#ifdef CONFIG_IPV6_SIT_6RD
+ [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
+ [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
+ [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
+ [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
+#endif
+ [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
+ [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
+ [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
+ [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
+ [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
+};
+
+static void ipip6_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct net *net = dev_net(dev);
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+
+ if (dev != sitn->fb_tunnel_dev)
+ unregister_netdevice_queue(dev, head);
+}
+
+static struct rtnl_link_ops sit_link_ops __read_mostly = {
+ .kind = "sit",
+ .maxtype = IFLA_IPTUN_MAX,
+ .policy = ipip6_policy,
+ .priv_size = sizeof(struct ip_tunnel),
+ .setup = ipip6_tunnel_setup,
+ .validate = ipip6_validate,
+ .newlink = ipip6_newlink,
+ .changelink = ipip6_changelink,
+ .get_size = ipip6_get_size,
+ .fill_info = ipip6_fill_info,
+ .dellink = ipip6_dellink,
+ .get_link_net = ip_tunnel_get_link_net,
+};
+
+static struct xfrm_tunnel sit_handler __read_mostly = {
+ .handler = ipip6_rcv,
+ .err_handler = ipip6_err,
+ .priority = 1,
+};
+
+static struct xfrm_tunnel ipip_handler __read_mostly = {
+ .handler = ipip_rcv,
+ .err_handler = ipip6_err,
+ .priority = 2,
+};
+
+#if IS_ENABLED(CONFIG_MPLS)
+static struct xfrm_tunnel mplsip_handler __read_mostly = {
+ .handler = mplsip_rcv,
+ .err_handler = ipip6_err,
+ .priority = 2,
+};
+#endif
+
+static void __net_exit sit_destroy_tunnels(struct net *net,
+ struct list_head *head)
+{
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+ struct net_device *dev, *aux;
+ int prio;
+
+ for_each_netdev_safe(net, dev, aux)
+ if (dev->rtnl_link_ops == &sit_link_ops)
+ unregister_netdevice_queue(dev, head);
+
+ for (prio = 1; prio < 4; prio++) {
+ int h;
+ for (h = 0; h < IP6_SIT_HASH_SIZE; h++) {
+ struct ip_tunnel *t;
+
+ t = rtnl_dereference(sitn->tunnels[prio][h]);
+ while (t) {
+ /* If dev is in the same netns, it has already
+ * been added to the list by the previous loop.
+ */
+ if (!net_eq(dev_net(t->dev), net))
+ unregister_netdevice_queue(t->dev,
+ head);
+ t = rtnl_dereference(t->next);
+ }
+ }
+ }
+}
+
+static int __net_init sit_init_net(struct net *net)
+{
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+ struct ip_tunnel *t;
+ int err;
+
+ sitn->tunnels[0] = sitn->tunnels_wc;
+ sitn->tunnels[1] = sitn->tunnels_l;
+ sitn->tunnels[2] = sitn->tunnels_r;
+ sitn->tunnels[3] = sitn->tunnels_r_l;
+
+ if (!net_has_fallback_tunnels(net))
+ return 0;
+
+ sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
+ NET_NAME_UNKNOWN,
+ ipip6_tunnel_setup);
+ if (!sitn->fb_tunnel_dev) {
+ err = -ENOMEM;
+ goto err_alloc_dev;
+ }
+ dev_net_set(sitn->fb_tunnel_dev, net);
+ sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
+ /* FB netdevice is special: we have one, and only one per netns.
+ * Allowing to move it to another netns is clearly unsafe.
+ */
+ sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
+
+ err = register_netdev(sitn->fb_tunnel_dev);
+ if (err)
+ goto err_reg_dev;
+
+ ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
+ ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
+
+ t = netdev_priv(sitn->fb_tunnel_dev);
+
+ strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
+ return 0;
+
+err_reg_dev:
+ ipip6_dev_free(sitn->fb_tunnel_dev);
+err_alloc_dev:
+ return err;
+}
+
+static void __net_exit sit_exit_batch_net(struct list_head *net_list)
+{
+ LIST_HEAD(list);
+ struct net *net;
+
+ rtnl_lock();
+ list_for_each_entry(net, net_list, exit_list)
+ sit_destroy_tunnels(net, &list);
+
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+}
+
+static struct pernet_operations sit_net_ops = {
+ .init = sit_init_net,
+ .exit_batch = sit_exit_batch_net,
+ .id = &sit_net_id,
+ .size = sizeof(struct sit_net),
+};
+
+static void __exit sit_cleanup(void)
+{
+ rtnl_link_unregister(&sit_link_ops);
+ xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
+ xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
+#if IS_ENABLED(CONFIG_MPLS)
+ xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
+#endif
+
+ unregister_pernet_device(&sit_net_ops);
+ rcu_barrier(); /* Wait for completion of call_rcu()'s */
+}
+
+static int __init sit_init(void)
+{
+ int err;
+
+ pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n");
+
+ err = register_pernet_device(&sit_net_ops);
+ if (err < 0)
+ return err;
+ err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
+ if (err < 0) {
+ pr_info("%s: can't register ip6ip4\n", __func__);
+ goto xfrm_tunnel_failed;
+ }
+ err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
+ if (err < 0) {
+ pr_info("%s: can't register ip4ip4\n", __func__);
+ goto xfrm_tunnel4_failed;
+ }
+#if IS_ENABLED(CONFIG_MPLS)
+ err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
+ if (err < 0) {
+ pr_info("%s: can't register mplsip\n", __func__);
+ goto xfrm_tunnel_mpls_failed;
+ }
+#endif
+ err = rtnl_link_register(&sit_link_ops);
+ if (err < 0)
+ goto rtnl_link_failed;
+
+out:
+ return err;
+
+rtnl_link_failed:
+#if IS_ENABLED(CONFIG_MPLS)
+ xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
+xfrm_tunnel_mpls_failed:
+#endif
+ xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
+xfrm_tunnel4_failed:
+ xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
+xfrm_tunnel_failed:
+ unregister_pernet_device(&sit_net_ops);
+ goto out;
+}
+
+module_init(sit_init);
+module_exit(sit_cleanup);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_RTNL_LINK("sit");
+MODULE_ALIAS_NETDEV("sit0");
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
new file mode 100644
index 0000000..e997141
--- /dev/null
+++ b/net/ipv6/syncookies.c
@@ -0,0 +1,263 @@
+/*
+ * IPv6 Syncookies implementation for the Linux kernel
+ *
+ * Authors:
+ * Glenn Griffin <ggriffin.kernel@gmail.com>
+ *
+ * Based on IPv4 implementation by Andi Kleen
+ * linux/net/ipv4/syncookies.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/tcp.h>
+#include <linux/random.h>
+#include <linux/siphash.h>
+#include <linux/kernel.h>
+#include <net/secure_seq.h>
+#include <net/ipv6.h>
+#include <net/tcp.h>
+
+#define COOKIEBITS 24 /* Upper bits store count */
+#define COOKIEMASK (((__u32)1 << COOKIEBITS) - 1)
+
+static siphash_key_t syncookie6_secret[2] __read_mostly;
+
+/* RFC 2460, Section 8.3:
+ * [ipv6 tcp] MSS must be computed as the maximum packet size minus 60 [..]
+ *
+ * Due to IPV6_MIN_MTU=1280 the lowest possible MSS is 1220, which allows
+ * using higher values than ipv4 tcp syncookies.
+ * The other values are chosen based on ethernet (1500 and 9k MTU), plus
+ * one that accounts for common encap (PPPoe) overhead. Table must be sorted.
+ */
+static __u16 const msstab[] = {
+ 1280 - 60, /* IPV6_MIN_MTU - 60 */
+ 1480 - 60,
+ 1500 - 60,
+ 9000 - 60,
+};
+
+static u32 cookie_hash(const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ __be16 sport, __be16 dport, u32 count, int c)
+{
+ const struct {
+ struct in6_addr saddr;
+ struct in6_addr daddr;
+ u32 count;
+ __be16 sport;
+ __be16 dport;
+ } __aligned(SIPHASH_ALIGNMENT) combined = {
+ .saddr = *saddr,
+ .daddr = *daddr,
+ .count = count,
+ .sport = sport,
+ .dport = dport
+ };
+
+ net_get_random_once(syncookie6_secret, sizeof(syncookie6_secret));
+ return siphash(&combined, offsetofend(typeof(combined), dport),
+ &syncookie6_secret[c]);
+}
+
+static __u32 secure_tcp_syn_cookie(const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ __be16 sport, __be16 dport, __u32 sseq,
+ __u32 data)
+{
+ u32 count = tcp_cookie_time();
+ return (cookie_hash(saddr, daddr, sport, dport, 0, 0) +
+ sseq + (count << COOKIEBITS) +
+ ((cookie_hash(saddr, daddr, sport, dport, count, 1) + data)
+ & COOKIEMASK));
+}
+
+static __u32 check_tcp_syn_cookie(__u32 cookie, const struct in6_addr *saddr,
+ const struct in6_addr *daddr, __be16 sport,
+ __be16 dport, __u32 sseq)
+{
+ __u32 diff, count = tcp_cookie_time();
+
+ cookie -= cookie_hash(saddr, daddr, sport, dport, 0, 0) + sseq;
+
+ diff = (count - (cookie >> COOKIEBITS)) & ((__u32) -1 >> COOKIEBITS);
+ if (diff >= MAX_SYNCOOKIE_AGE)
+ return (__u32)-1;
+
+ return (cookie -
+ cookie_hash(saddr, daddr, sport, dport, count - diff, 1))
+ & COOKIEMASK;
+}
+
+u32 __cookie_v6_init_sequence(const struct ipv6hdr *iph,
+ const struct tcphdr *th, __u16 *mssp)
+{
+ int mssind;
+ const __u16 mss = *mssp;
+
+ for (mssind = ARRAY_SIZE(msstab) - 1; mssind ; mssind--)
+ if (mss >= msstab[mssind])
+ break;
+
+ *mssp = msstab[mssind];
+
+ return secure_tcp_syn_cookie(&iph->saddr, &iph->daddr, th->source,
+ th->dest, ntohl(th->seq), mssind);
+}
+EXPORT_SYMBOL_GPL(__cookie_v6_init_sequence);
+
+__u32 cookie_v6_init_sequence(const struct sk_buff *skb, __u16 *mssp)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ const struct tcphdr *th = tcp_hdr(skb);
+
+ return __cookie_v6_init_sequence(iph, th, mssp);
+}
+
+int __cookie_v6_check(const struct ipv6hdr *iph, const struct tcphdr *th,
+ __u32 cookie)
+{
+ __u32 seq = ntohl(th->seq) - 1;
+ __u32 mssind = check_tcp_syn_cookie(cookie, &iph->saddr, &iph->daddr,
+ th->source, th->dest, seq);
+
+ return mssind < ARRAY_SIZE(msstab) ? msstab[mssind] : 0;
+}
+EXPORT_SYMBOL_GPL(__cookie_v6_check);
+
+struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
+{
+ struct tcp_options_received tcp_opt;
+ struct inet_request_sock *ireq;
+ struct tcp_request_sock *treq;
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct tcp_sock *tp = tcp_sk(sk);
+ const struct tcphdr *th = tcp_hdr(skb);
+ __u32 cookie = ntohl(th->ack_seq) - 1;
+ struct sock *ret = sk;
+ struct request_sock *req;
+ int mss;
+ struct dst_entry *dst;
+ __u8 rcv_wscale;
+ u32 tsoff = 0;
+
+ if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies || !th->ack || th->rst)
+ goto out;
+
+ if (tcp_synq_no_recent_overflow(sk))
+ goto out;
+
+ mss = __cookie_v6_check(ipv6_hdr(skb), th, cookie);
+ if (mss == 0) {
+ __NET_INC_STATS(sock_net(sk), LINUX_MIB_SYNCOOKIESFAILED);
+ goto out;
+ }
+
+ __NET_INC_STATS(sock_net(sk), LINUX_MIB_SYNCOOKIESRECV);
+
+ /* check for timestamp cookie support */
+ memset(&tcp_opt, 0, sizeof(tcp_opt));
+ tcp_parse_options(sock_net(sk), skb, &tcp_opt, 0, NULL);
+
+ if (tcp_opt.saw_tstamp && tcp_opt.rcv_tsecr) {
+ tsoff = secure_tcpv6_ts_off(sock_net(sk),
+ ipv6_hdr(skb)->daddr.s6_addr32,
+ ipv6_hdr(skb)->saddr.s6_addr32);
+ tcp_opt.rcv_tsecr -= tsoff;
+ }
+
+ if (!cookie_timestamp_decode(sock_net(sk), &tcp_opt))
+ goto out;
+
+ ret = NULL;
+ req = inet_reqsk_alloc(&tcp6_request_sock_ops, sk, false);
+ if (!req)
+ goto out;
+
+ ireq = inet_rsk(req);
+ treq = tcp_rsk(req);
+ treq->tfo_listener = false;
+
+ if (security_inet_conn_request(sk, skb, req))
+ goto out_free;
+
+ req->mss = mss;
+ ireq->ir_rmt_port = th->source;
+ ireq->ir_num = ntohs(th->dest);
+ ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
+ ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
+ if (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) ||
+ np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
+ np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
+ refcount_inc(&skb->users);
+ ireq->pktopts = skb;
+ }
+
+ ireq->ir_iif = inet_request_bound_dev_if(sk, skb);
+ /* So that link locals have meaning */
+ if (!sk->sk_bound_dev_if &&
+ ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
+ ireq->ir_iif = tcp_v6_iif(skb);
+
+ ireq->ir_mark = inet_request_mark(sk, skb);
+
+ req->num_retrans = 0;
+ ireq->snd_wscale = tcp_opt.snd_wscale;
+ ireq->sack_ok = tcp_opt.sack_ok;
+ ireq->wscale_ok = tcp_opt.wscale_ok;
+ ireq->tstamp_ok = tcp_opt.saw_tstamp;
+ req->ts_recent = tcp_opt.saw_tstamp ? tcp_opt.rcv_tsval : 0;
+ treq->snt_synack = 0;
+ treq->rcv_isn = ntohl(th->seq) - 1;
+ treq->snt_isn = cookie;
+ treq->ts_off = 0;
+ treq->txhash = net_tx_rndhash();
+ if (IS_ENABLED(CONFIG_SMC))
+ ireq->smc_ok = 0;
+
+ /*
+ * We need to lookup the dst_entry to get the correct window size.
+ * This is taken from tcp_v6_syn_recv_sock. Somebody please enlighten
+ * me if there is a preferred way.
+ */
+ {
+ struct in6_addr *final_p, final;
+ struct flowi6 fl6;
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_TCP;
+ fl6.daddr = ireq->ir_v6_rmt_addr;
+ final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
+ fl6.saddr = ireq->ir_v6_loc_addr;
+ fl6.flowi6_oif = ireq->ir_iif;
+ fl6.flowi6_mark = ireq->ir_mark;
+ fl6.fl6_dport = ireq->ir_rmt_port;
+ fl6.fl6_sport = inet_sk(sk)->inet_sport;
+ fl6.flowi6_uid = sk->sk_uid;
+ security_req_classify_flow(req, flowi6_to_flowi(&fl6));
+
+ dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
+ if (IS_ERR(dst))
+ goto out_free;
+ }
+
+ req->rsk_window_clamp = tp->window_clamp ? :dst_metric(dst, RTAX_WINDOW);
+ tcp_select_initial_window(sk, tcp_full_space(sk), req->mss,
+ &req->rsk_rcv_wnd, &req->rsk_window_clamp,
+ ireq->wscale_ok, &rcv_wscale,
+ dst_metric(dst, RTAX_INITRWND));
+
+ ireq->rcv_wscale = rcv_wscale;
+ ireq->ecn_ok = cookie_ecn_ok(&tcp_opt, sock_net(sk), dst);
+
+ ret = tcp_get_cookie_sock(sk, skb, req, dst, tsoff);
+out:
+ return ret;
+out_free:
+ reqsk_free(req);
+ return NULL;
+}
diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c
new file mode 100644
index 0000000..e15cd37
--- /dev/null
+++ b/net/ipv6/sysctl_net_ipv6.c
@@ -0,0 +1,316 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
+ *
+ * Changes:
+ * YOSHIFUJI Hideaki @USAGI: added icmp sysctl table.
+ */
+
+#include <linux/mm.h>
+#include <linux/sysctl.h>
+#include <linux/in6.h>
+#include <linux/ipv6.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <net/ndisc.h>
+#include <net/ipv6.h>
+#include <net/addrconf.h>
+#include <net/inet_frag.h>
+#include <net/netevent.h>
+#ifdef CONFIG_NETLABEL
+#include <net/calipso.h>
+#endif
+
+static int zero;
+static int one = 1;
+static int auto_flowlabels_min;
+static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
+
+static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ struct net *net;
+ int ret;
+
+ net = container_of(table->data, struct net,
+ ipv6.sysctl.multipath_hash_policy);
+ ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+ if (write && ret == 0)
+ call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
+
+ return ret;
+}
+
+static struct ctl_table ipv6_table_template[] = {
+ {
+ .procname = "bindv6only",
+ .data = &init_net.ipv6.sysctl.bindv6only,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "anycast_src_echo_reply",
+ .data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "flowlabel_consistency",
+ .data = &init_net.ipv6.sysctl.flowlabel_consistency,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "auto_flowlabels",
+ .data = &init_net.ipv6.sysctl.auto_flowlabels,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &auto_flowlabels_min,
+ .extra2 = &auto_flowlabels_max
+ },
+ {
+ .procname = "fwmark_reflect",
+ .data = &init_net.ipv6.sysctl.fwmark_reflect,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "idgen_retries",
+ .data = &init_net.ipv6.sysctl.idgen_retries,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "idgen_delay",
+ .data = &init_net.ipv6.sysctl.idgen_delay,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "flowlabel_state_ranges",
+ .data = &init_net.ipv6.sysctl.flowlabel_state_ranges,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "ip_nonlocal_bind",
+ .data = &init_net.ipv6.sysctl.ip_nonlocal_bind,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "flowlabel_reflect",
+ .data = &init_net.ipv6.sysctl.flowlabel_reflect,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "max_dst_opts_number",
+ .data = &init_net.ipv6.sysctl.max_dst_opts_cnt,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "max_hbh_opts_number",
+ .data = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "max_dst_opts_length",
+ .data = &init_net.ipv6.sysctl.max_dst_opts_len,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "max_hbh_length",
+ .data = &init_net.ipv6.sysctl.max_hbh_opts_len,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "fib_multipath_hash_policy",
+ .data = &init_net.ipv6.sysctl.multipath_hash_policy,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_rt6_multipath_hash_policy,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
+ {
+ .procname = "seg6_flowlabel",
+ .data = &init_net.ipv6.sysctl.seg6_flowlabel,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ { }
+};
+
+static struct ctl_table ipv6_rotable[] = {
+ {
+ .procname = "mld_max_msf",
+ .data = &sysctl_mld_max_msf,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "mld_qrv",
+ .data = &sysctl_mld_qrv,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &one
+ },
+#ifdef CONFIG_NETLABEL
+ {
+ .procname = "calipso_cache_enable",
+ .data = &calipso_cache_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "calipso_cache_bucket_size",
+ .data = &calipso_cache_bucketsize,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif /* CONFIG_NETLABEL */
+ { }
+};
+
+static int __net_init ipv6_sysctl_net_init(struct net *net)
+{
+ struct ctl_table *ipv6_table;
+ struct ctl_table *ipv6_route_table;
+ struct ctl_table *ipv6_icmp_table;
+ int err;
+
+ err = -ENOMEM;
+ ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
+ GFP_KERNEL);
+ if (!ipv6_table)
+ goto out;
+ ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
+ ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
+ ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
+ ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
+ ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
+ ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
+ ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
+ ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
+ ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
+ ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;
+ ipv6_table[10].data = &net->ipv6.sysctl.max_dst_opts_cnt;
+ ipv6_table[11].data = &net->ipv6.sysctl.max_hbh_opts_cnt;
+ ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len;
+ ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len;
+ ipv6_table[14].data = &net->ipv6.sysctl.multipath_hash_policy,
+ ipv6_table[15].data = &net->ipv6.sysctl.seg6_flowlabel;
+
+ ipv6_route_table = ipv6_route_sysctl_init(net);
+ if (!ipv6_route_table)
+ goto out_ipv6_table;
+
+ ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
+ if (!ipv6_icmp_table)
+ goto out_ipv6_route_table;
+
+ net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
+ if (!net->ipv6.sysctl.hdr)
+ goto out_ipv6_icmp_table;
+
+ net->ipv6.sysctl.route_hdr =
+ register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
+ if (!net->ipv6.sysctl.route_hdr)
+ goto out_unregister_ipv6_table;
+
+ net->ipv6.sysctl.icmp_hdr =
+ register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
+ if (!net->ipv6.sysctl.icmp_hdr)
+ goto out_unregister_route_table;
+
+ err = 0;
+out:
+ return err;
+out_unregister_route_table:
+ unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
+out_unregister_ipv6_table:
+ unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
+out_ipv6_icmp_table:
+ kfree(ipv6_icmp_table);
+out_ipv6_route_table:
+ kfree(ipv6_route_table);
+out_ipv6_table:
+ kfree(ipv6_table);
+ goto out;
+}
+
+static void __net_exit ipv6_sysctl_net_exit(struct net *net)
+{
+ struct ctl_table *ipv6_table;
+ struct ctl_table *ipv6_route_table;
+ struct ctl_table *ipv6_icmp_table;
+
+ ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
+ ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
+ ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
+
+ unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
+ unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
+ unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
+
+ kfree(ipv6_table);
+ kfree(ipv6_route_table);
+ kfree(ipv6_icmp_table);
+}
+
+static struct pernet_operations ipv6_sysctl_net_ops = {
+ .init = ipv6_sysctl_net_init,
+ .exit = ipv6_sysctl_net_exit,
+};
+
+static struct ctl_table_header *ip6_header;
+
+int ipv6_sysctl_register(void)
+{
+ int err = -ENOMEM;
+
+ ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
+ if (!ip6_header)
+ goto out;
+
+ err = register_pernet_subsys(&ipv6_sysctl_net_ops);
+ if (err)
+ goto err_pernet;
+out:
+ return err;
+
+err_pernet:
+ unregister_net_sysctl_table(ip6_header);
+ goto out;
+}
+
+void ipv6_sysctl_unregister(void)
+{
+ unregister_net_sysctl_table(ip6_header);
+ unregister_pernet_subsys(&ipv6_sysctl_net_ops);
+}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
new file mode 100644
index 0000000..03e6b7a
--- /dev/null
+++ b/net/ipv6/tcp_ipv6.c
@@ -0,0 +1,2067 @@
+/*
+ * TCP over IPv6
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Based on:
+ * linux/net/ipv4/tcp.c
+ * linux/net/ipv4/tcp_input.c
+ * linux/net/ipv4/tcp_output.c
+ *
+ * Fixes:
+ * Hideaki YOSHIFUJI : sin6_scope_id support
+ * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
+ * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
+ * a single port at the same time.
+ * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/bottom_half.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/jiffies.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/init.h>
+#include <linux/jhash.h>
+#include <linux/ipsec.h>
+#include <linux/times.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/random.h>
+
+#include <net/tcp.h>
+#include <net/ndisc.h>
+#include <net/inet6_hashtables.h>
+#include <net/inet6_connection_sock.h>
+#include <net/ipv6.h>
+#include <net/transp_v6.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+#include <net/ip6_checksum.h>
+#include <net/inet_ecn.h>
+#include <net/protocol.h>
+#include <net/xfrm.h>
+#include <net/snmp.h>
+#include <net/dsfield.h>
+#include <net/timewait_sock.h>
+#include <net/inet_common.h>
+#include <net/secure_seq.h>
+#include <net/busy_poll.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include <crypto/hash.h>
+#include <linux/scatterlist.h>
+
+#include <trace/events/tcp.h>
+
+static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb);
+static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
+ struct request_sock *req);
+
+static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
+
+static const struct inet_connection_sock_af_ops ipv6_mapped;
+static const struct inet_connection_sock_af_ops ipv6_specific;
+#ifdef CONFIG_TCP_MD5SIG
+static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
+static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
+#else
+static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
+ const struct in6_addr *addr)
+{
+ return NULL;
+}
+#endif
+
+static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb_dst(skb);
+
+ if (dst && dst_hold_safe(dst)) {
+ const struct rt6_info *rt = (const struct rt6_info *)dst;
+
+ sk->sk_rx_dst = dst;
+ inet_sk(sk)->rx_dst_ifindex = skb->skb_iif;
+ inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
+ }
+}
+
+static u32 tcp_v6_init_seq(const struct sk_buff *skb)
+{
+ return secure_tcpv6_seq(ipv6_hdr(skb)->daddr.s6_addr32,
+ ipv6_hdr(skb)->saddr.s6_addr32,
+ tcp_hdr(skb)->dest,
+ tcp_hdr(skb)->source);
+}
+
+static u32 tcp_v6_init_ts_off(const struct net *net, const struct sk_buff *skb)
+{
+ return secure_tcpv6_ts_off(net, ipv6_hdr(skb)->daddr.s6_addr32,
+ ipv6_hdr(skb)->saddr.s6_addr32);
+}
+
+static int tcp_v6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
+ int addr_len)
+{
+ /* This check is replicated from tcp_v6_connect() and intended to
+ * prevent BPF program called below from accessing bytes that are out
+ * of the bound specified by user in addr_len.
+ */
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+
+ sock_owned_by_me(sk);
+
+ return BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr);
+}
+
+static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
+ int addr_len)
+{
+ struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
+ struct inet_sock *inet = inet_sk(sk);
+ struct inet_connection_sock *icsk = inet_csk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct in6_addr *saddr = NULL, *final_p, final;
+ struct ipv6_txoptions *opt;
+ struct flowi6 fl6;
+ struct dst_entry *dst;
+ int addr_type;
+ int err;
+ struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row;
+
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+
+ if (usin->sin6_family != AF_INET6)
+ return -EAFNOSUPPORT;
+
+ memset(&fl6, 0, sizeof(fl6));
+
+ if (np->sndflow) {
+ fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
+ IP6_ECN_flow_init(fl6.flowlabel);
+ if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
+ struct ip6_flowlabel *flowlabel;
+ flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
+ if (!flowlabel)
+ return -EINVAL;
+ fl6_sock_release(flowlabel);
+ }
+ }
+
+ /*
+ * connect() to INADDR_ANY means loopback (BSD'ism).
+ */
+
+ if (ipv6_addr_any(&usin->sin6_addr)) {
+ if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
+ ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
+ &usin->sin6_addr);
+ else
+ usin->sin6_addr = in6addr_loopback;
+ }
+
+ addr_type = ipv6_addr_type(&usin->sin6_addr);
+
+ if (addr_type & IPV6_ADDR_MULTICAST)
+ return -ENETUNREACH;
+
+ if (addr_type&IPV6_ADDR_LINKLOCAL) {
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ usin->sin6_scope_id) {
+ /* If interface is set while binding, indices
+ * must coincide.
+ */
+ if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id))
+ return -EINVAL;
+
+ sk->sk_bound_dev_if = usin->sin6_scope_id;
+ }
+
+ /* Connect to link-local address requires an interface */
+ if (!sk->sk_bound_dev_if)
+ return -EINVAL;
+ }
+
+ if (tp->rx_opt.ts_recent_stamp &&
+ !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) {
+ tp->rx_opt.ts_recent = 0;
+ tp->rx_opt.ts_recent_stamp = 0;
+ tp->write_seq = 0;
+ }
+
+ sk->sk_v6_daddr = usin->sin6_addr;
+ np->flow_label = fl6.flowlabel;
+
+ /*
+ * TCP over IPv4
+ */
+
+ if (addr_type & IPV6_ADDR_MAPPED) {
+ u32 exthdrlen = icsk->icsk_ext_hdr_len;
+ struct sockaddr_in sin;
+
+ SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
+
+ if (__ipv6_only_sock(sk))
+ return -ENETUNREACH;
+
+ sin.sin_family = AF_INET;
+ sin.sin_port = usin->sin6_port;
+ sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
+
+ icsk->icsk_af_ops = &ipv6_mapped;
+ sk->sk_backlog_rcv = tcp_v4_do_rcv;
+#ifdef CONFIG_TCP_MD5SIG
+ tp->af_specific = &tcp_sock_ipv6_mapped_specific;
+#endif
+
+ err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
+
+ if (err) {
+ icsk->icsk_ext_hdr_len = exthdrlen;
+ icsk->icsk_af_ops = &ipv6_specific;
+ sk->sk_backlog_rcv = tcp_v6_do_rcv;
+#ifdef CONFIG_TCP_MD5SIG
+ tp->af_specific = &tcp_sock_ipv6_specific;
+#endif
+ goto failure;
+ }
+ np->saddr = sk->sk_v6_rcv_saddr;
+
+ return err;
+ }
+
+ if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
+ saddr = &sk->sk_v6_rcv_saddr;
+
+ fl6.flowi6_proto = IPPROTO_TCP;
+ fl6.daddr = sk->sk_v6_daddr;
+ fl6.saddr = saddr ? *saddr : np->saddr;
+ fl6.flowi6_oif = sk->sk_bound_dev_if;
+ fl6.flowi6_mark = sk->sk_mark;
+ fl6.fl6_dport = usin->sin6_port;
+ fl6.fl6_sport = inet->inet_sport;
+ fl6.flowi6_uid = sk->sk_uid;
+
+ opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
+ final_p = fl6_update_dst(&fl6, opt, &final);
+
+ security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
+
+ dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ goto failure;
+ }
+
+ if (!saddr) {
+ saddr = &fl6.saddr;
+ sk->sk_v6_rcv_saddr = *saddr;
+ }
+
+ /* set the source address */
+ np->saddr = *saddr;
+ inet->inet_rcv_saddr = LOOPBACK4_IPV6;
+
+ sk->sk_gso_type = SKB_GSO_TCPV6;
+ ip6_dst_store(sk, dst, NULL, NULL);
+
+ icsk->icsk_ext_hdr_len = 0;
+ if (opt)
+ icsk->icsk_ext_hdr_len = opt->opt_flen +
+ opt->opt_nflen;
+
+ tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
+
+ inet->inet_dport = usin->sin6_port;
+
+ tcp_set_state(sk, TCP_SYN_SENT);
+ err = inet6_hash_connect(tcp_death_row, sk);
+ if (err)
+ goto late_failure;
+
+ sk_set_txhash(sk);
+
+ if (likely(!tp->repair)) {
+ if (!tp->write_seq)
+ tp->write_seq = secure_tcpv6_seq(np->saddr.s6_addr32,
+ sk->sk_v6_daddr.s6_addr32,
+ inet->inet_sport,
+ inet->inet_dport);
+ tp->tsoffset = secure_tcpv6_ts_off(sock_net(sk),
+ np->saddr.s6_addr32,
+ sk->sk_v6_daddr.s6_addr32);
+ }
+
+ if (tcp_fastopen_defer_connect(sk, &err))
+ return err;
+ if (err)
+ goto late_failure;
+
+ err = tcp_connect(sk);
+ if (err)
+ goto late_failure;
+
+ return 0;
+
+late_failure:
+ tcp_set_state(sk, TCP_CLOSE);
+failure:
+ inet->inet_dport = 0;
+ sk->sk_route_caps = 0;
+ return err;
+}
+
+static void tcp_v6_mtu_reduced(struct sock *sk)
+{
+ struct dst_entry *dst;
+
+ if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
+ return;
+
+ dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info);
+ if (!dst)
+ return;
+
+ if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
+ tcp_sync_mss(sk, dst_mtu(dst));
+ tcp_simple_retransmit(sk);
+ }
+}
+
+static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
+ const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
+ struct net *net = dev_net(skb->dev);
+ struct request_sock *fastopen;
+ struct ipv6_pinfo *np;
+ struct tcp_sock *tp;
+ __u32 seq, snd_una;
+ struct sock *sk;
+ bool fatal;
+ int err;
+
+ sk = __inet6_lookup_established(net, &tcp_hashinfo,
+ &hdr->daddr, th->dest,
+ &hdr->saddr, ntohs(th->source),
+ skb->dev->ifindex, inet6_sdif(skb));
+
+ if (!sk) {
+ __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
+ ICMP6_MIB_INERRORS);
+ return;
+ }
+
+ if (sk->sk_state == TCP_TIME_WAIT) {
+ inet_twsk_put(inet_twsk(sk));
+ return;
+ }
+ seq = ntohl(th->seq);
+ fatal = icmpv6_err_convert(type, code, &err);
+ if (sk->sk_state == TCP_NEW_SYN_RECV)
+ return tcp_req_err(sk, seq, fatal);
+
+ bh_lock_sock(sk);
+ if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
+ __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS);
+
+ if (sk->sk_state == TCP_CLOSE)
+ goto out;
+
+ if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
+ __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
+ goto out;
+ }
+
+ tp = tcp_sk(sk);
+ /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */
+ fastopen = tp->fastopen_rsk;
+ snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una;
+ if (sk->sk_state != TCP_LISTEN &&
+ !between(seq, snd_una, tp->snd_nxt)) {
+ __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS);
+ goto out;
+ }
+
+ np = inet6_sk(sk);
+
+ if (type == NDISC_REDIRECT) {
+ if (!sock_owned_by_user(sk)) {
+ struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
+
+ if (dst)
+ dst->ops->redirect(dst, sk, skb);
+ }
+ goto out;
+ }
+
+ if (type == ICMPV6_PKT_TOOBIG) {
+ /* We are not interested in TCP_LISTEN and open_requests
+ * (SYN-ACKs send out by Linux are always <576bytes so
+ * they should go through unfragmented).
+ */
+ if (sk->sk_state == TCP_LISTEN)
+ goto out;
+
+ if (!ip6_sk_accept_pmtu(sk))
+ goto out;
+
+ tp->mtu_info = ntohl(info);
+ if (!sock_owned_by_user(sk))
+ tcp_v6_mtu_reduced(sk);
+ else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
+ &sk->sk_tsq_flags))
+ sock_hold(sk);
+ goto out;
+ }
+
+
+ /* Might be for an request_sock */
+ switch (sk->sk_state) {
+ case TCP_SYN_SENT:
+ case TCP_SYN_RECV:
+ /* Only in fast or simultaneous open. If a fast open socket is
+ * is already accepted it is treated as a connected one below.
+ */
+ if (fastopen && !fastopen->sk)
+ break;
+
+ if (!sock_owned_by_user(sk)) {
+ sk->sk_err = err;
+ sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
+
+ tcp_done(sk);
+ } else
+ sk->sk_err_soft = err;
+ goto out;
+ }
+
+ if (!sock_owned_by_user(sk) && np->recverr) {
+ sk->sk_err = err;
+ sk->sk_error_report(sk);
+ } else
+ sk->sk_err_soft = err;
+
+out:
+ bh_unlock_sock(sk);
+ sock_put(sk);
+}
+
+
+static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
+ struct flowi *fl,
+ struct request_sock *req,
+ struct tcp_fastopen_cookie *foc,
+ enum tcp_synack_type synack_type)
+{
+ struct inet_request_sock *ireq = inet_rsk(req);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_txoptions *opt;
+ struct flowi6 *fl6 = &fl->u.ip6;
+ struct sk_buff *skb;
+ int err = -ENOMEM;
+
+ /* First, grab a route. */
+ if (!dst && (dst = inet6_csk_route_req(sk, fl6, req,
+ IPPROTO_TCP)) == NULL)
+ goto done;
+
+ skb = tcp_make_synack(sk, dst, req, foc, synack_type);
+
+ if (skb) {
+ __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr,
+ &ireq->ir_v6_rmt_addr);
+
+ fl6->daddr = ireq->ir_v6_rmt_addr;
+ if (np->repflow && ireq->pktopts)
+ fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));
+
+ rcu_read_lock();
+ opt = ireq->ipv6_opt;
+ if (!opt)
+ opt = rcu_dereference(np->opt);
+ err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass);
+ rcu_read_unlock();
+ err = net_xmit_eval(err);
+ }
+
+done:
+ return err;
+}
+
+
+static void tcp_v6_reqsk_destructor(struct request_sock *req)
+{
+ kfree(inet_rsk(req)->ipv6_opt);
+ kfree_skb(inet_rsk(req)->pktopts);
+}
+
+#ifdef CONFIG_TCP_MD5SIG
+static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
+ const struct in6_addr *addr)
+{
+ return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
+}
+
+static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
+ const struct sock *addr_sk)
+{
+ return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
+}
+
+static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
+ char __user *optval, int optlen)
+{
+ struct tcp_md5sig cmd;
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
+ u8 prefixlen;
+
+ if (optlen < sizeof(cmd))
+ return -EINVAL;
+
+ if (copy_from_user(&cmd, optval, sizeof(cmd)))
+ return -EFAULT;
+
+ if (sin6->sin6_family != AF_INET6)
+ return -EINVAL;
+
+ if (optname == TCP_MD5SIG_EXT &&
+ cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) {
+ prefixlen = cmd.tcpm_prefixlen;
+ if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) &&
+ prefixlen > 32))
+ return -EINVAL;
+ } else {
+ prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128;
+ }
+
+ if (!cmd.tcpm_keylen) {
+ if (ipv6_addr_v4mapped(&sin6->sin6_addr))
+ return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
+ AF_INET, prefixlen);
+ return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
+ AF_INET6, prefixlen);
+ }
+
+ if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
+ return -EINVAL;
+
+ if (ipv6_addr_v4mapped(&sin6->sin6_addr))
+ return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
+ AF_INET, prefixlen, cmd.tcpm_key,
+ cmd.tcpm_keylen, GFP_KERNEL);
+
+ return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
+ AF_INET6, prefixlen, cmd.tcpm_key,
+ cmd.tcpm_keylen, GFP_KERNEL);
+}
+
+static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr,
+ const struct tcphdr *th, int nbytes)
+{
+ struct tcp6_pseudohdr *bp;
+ struct scatterlist sg;
+ struct tcphdr *_th;
+
+ bp = hp->scratch;
+ /* 1. TCP pseudo-header (RFC2460) */
+ bp->saddr = *saddr;
+ bp->daddr = *daddr;
+ bp->protocol = cpu_to_be32(IPPROTO_TCP);
+ bp->len = cpu_to_be32(nbytes);
+
+ _th = (struct tcphdr *)(bp + 1);
+ memcpy(_th, th, sizeof(*th));
+ _th->check = 0;
+
+ sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
+ ahash_request_set_crypt(hp->md5_req, &sg, NULL,
+ sizeof(*bp) + sizeof(*th));
+ return crypto_ahash_update(hp->md5_req);
+}
+
+static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
+ const struct in6_addr *daddr, struct in6_addr *saddr,
+ const struct tcphdr *th)
+{
+ struct tcp_md5sig_pool *hp;
+ struct ahash_request *req;
+
+ hp = tcp_get_md5sig_pool();
+ if (!hp)
+ goto clear_hash_noput;
+ req = hp->md5_req;
+
+ if (crypto_ahash_init(req))
+ goto clear_hash;
+ if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
+ goto clear_hash;
+ if (tcp_md5_hash_key(hp, key))
+ goto clear_hash;
+ ahash_request_set_crypt(req, NULL, md5_hash, 0);
+ if (crypto_ahash_final(req))
+ goto clear_hash;
+
+ tcp_put_md5sig_pool();
+ return 0;
+
+clear_hash:
+ tcp_put_md5sig_pool();
+clear_hash_noput:
+ memset(md5_hash, 0, 16);
+ return 1;
+}
+
+static int tcp_v6_md5_hash_skb(char *md5_hash,
+ const struct tcp_md5sig_key *key,
+ const struct sock *sk,
+ const struct sk_buff *skb)
+{
+ const struct in6_addr *saddr, *daddr;
+ struct tcp_md5sig_pool *hp;
+ struct ahash_request *req;
+ const struct tcphdr *th = tcp_hdr(skb);
+
+ if (sk) { /* valid for establish/request sockets */
+ saddr = &sk->sk_v6_rcv_saddr;
+ daddr = &sk->sk_v6_daddr;
+ } else {
+ const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ saddr = &ip6h->saddr;
+ daddr = &ip6h->daddr;
+ }
+
+ hp = tcp_get_md5sig_pool();
+ if (!hp)
+ goto clear_hash_noput;
+ req = hp->md5_req;
+
+ if (crypto_ahash_init(req))
+ goto clear_hash;
+
+ if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len))
+ goto clear_hash;
+ if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
+ goto clear_hash;
+ if (tcp_md5_hash_key(hp, key))
+ goto clear_hash;
+ ahash_request_set_crypt(req, NULL, md5_hash, 0);
+ if (crypto_ahash_final(req))
+ goto clear_hash;
+
+ tcp_put_md5sig_pool();
+ return 0;
+
+clear_hash:
+ tcp_put_md5sig_pool();
+clear_hash_noput:
+ memset(md5_hash, 0, 16);
+ return 1;
+}
+
+#endif
+
+static bool tcp_v6_inbound_md5_hash(const struct sock *sk,
+ const struct sk_buff *skb)
+{
+#ifdef CONFIG_TCP_MD5SIG
+ const __u8 *hash_location = NULL;
+ struct tcp_md5sig_key *hash_expected;
+ const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ const struct tcphdr *th = tcp_hdr(skb);
+ int genhash;
+ u8 newhash[16];
+
+ hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
+ hash_location = tcp_parse_md5sig_option(th);
+
+ /* We've parsed the options - do we have a hash? */
+ if (!hash_expected && !hash_location)
+ return false;
+
+ if (hash_expected && !hash_location) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
+ return true;
+ }
+
+ if (!hash_expected && hash_location) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
+ return true;
+ }
+
+ /* check the signature */
+ genhash = tcp_v6_md5_hash_skb(newhash,
+ hash_expected,
+ NULL, skb);
+
+ if (genhash || memcmp(hash_location, newhash, 16) != 0) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
+ net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
+ genhash ? "failed" : "mismatch",
+ &ip6h->saddr, ntohs(th->source),
+ &ip6h->daddr, ntohs(th->dest));
+ return true;
+ }
+#endif
+ return false;
+}
+
+static void tcp_v6_init_req(struct request_sock *req,
+ const struct sock *sk_listener,
+ struct sk_buff *skb)
+{
+ struct inet_request_sock *ireq = inet_rsk(req);
+ const struct ipv6_pinfo *np = inet6_sk(sk_listener);
+
+ ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
+ ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
+
+ /* So that link locals have meaning */
+ if (!sk_listener->sk_bound_dev_if &&
+ ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
+ ireq->ir_iif = tcp_v6_iif(skb);
+
+ if (!TCP_SKB_CB(skb)->tcp_tw_isn &&
+ (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) ||
+ np->rxopt.bits.rxinfo ||
+ np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim ||
+ np->rxopt.bits.rxohlim || np->repflow)) {
+ refcount_inc(&skb->users);
+ ireq->pktopts = skb;
+ }
+}
+
+static struct dst_entry *tcp_v6_route_req(const struct sock *sk,
+ struct flowi *fl,
+ const struct request_sock *req)
+{
+ return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP);
+}
+
+struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
+ .family = AF_INET6,
+ .obj_size = sizeof(struct tcp6_request_sock),
+ .rtx_syn_ack = tcp_rtx_synack,
+ .send_ack = tcp_v6_reqsk_send_ack,
+ .destructor = tcp_v6_reqsk_destructor,
+ .send_reset = tcp_v6_send_reset,
+ .syn_ack_timeout = tcp_syn_ack_timeout,
+};
+
+static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
+ .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) -
+ sizeof(struct ipv6hdr),
+#ifdef CONFIG_TCP_MD5SIG
+ .req_md5_lookup = tcp_v6_md5_lookup,
+ .calc_md5_hash = tcp_v6_md5_hash_skb,
+#endif
+ .init_req = tcp_v6_init_req,
+#ifdef CONFIG_SYN_COOKIES
+ .cookie_init_seq = cookie_v6_init_sequence,
+#endif
+ .route_req = tcp_v6_route_req,
+ .init_seq = tcp_v6_init_seq,
+ .init_ts_off = tcp_v6_init_ts_off,
+ .send_synack = tcp_v6_send_synack,
+};
+
+static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq,
+ u32 ack, u32 win, u32 tsval, u32 tsecr,
+ int oif, struct tcp_md5sig_key *key, int rst,
+ u8 tclass, __be32 label)
+{
+ const struct tcphdr *th = tcp_hdr(skb);
+ struct tcphdr *t1;
+ struct sk_buff *buff;
+ struct flowi6 fl6;
+ struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
+ struct sock *ctl_sk = net->ipv6.tcp_sk;
+ unsigned int tot_len = sizeof(struct tcphdr);
+ struct dst_entry *dst;
+ __be32 *topt;
+ __u32 mark = 0;
+
+ if (tsecr)
+ tot_len += TCPOLEN_TSTAMP_ALIGNED;
+#ifdef CONFIG_TCP_MD5SIG
+ if (key)
+ tot_len += TCPOLEN_MD5SIG_ALIGNED;
+#endif
+
+ buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
+ GFP_ATOMIC);
+ if (!buff)
+ return;
+
+ skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
+
+ t1 = skb_push(buff, tot_len);
+ skb_reset_transport_header(buff);
+
+ /* Swap the send and the receive. */
+ memset(t1, 0, sizeof(*t1));
+ t1->dest = th->source;
+ t1->source = th->dest;
+ t1->doff = tot_len / 4;
+ t1->seq = htonl(seq);
+ t1->ack_seq = htonl(ack);
+ t1->ack = !rst || !th->ack;
+ t1->rst = rst;
+ t1->window = htons(win);
+
+ topt = (__be32 *)(t1 + 1);
+
+ if (tsecr) {
+ *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+ (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
+ *topt++ = htonl(tsval);
+ *topt++ = htonl(tsecr);
+ }
+
+#ifdef CONFIG_TCP_MD5SIG
+ if (key) {
+ *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+ (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
+ tcp_v6_md5_hash_hdr((__u8 *)topt, key,
+ &ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr, t1);
+ }
+#endif
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.daddr = ipv6_hdr(skb)->saddr;
+ fl6.saddr = ipv6_hdr(skb)->daddr;
+ fl6.flowlabel = label;
+
+ buff->ip_summed = CHECKSUM_PARTIAL;
+ buff->csum = 0;
+
+ __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
+
+ fl6.flowi6_proto = IPPROTO_TCP;
+ if (rt6_need_strict(&fl6.daddr) && !oif)
+ fl6.flowi6_oif = tcp_v6_iif(skb);
+ else {
+ if (!oif && netif_index_is_l3_master(net, skb->skb_iif))
+ oif = skb->skb_iif;
+
+ fl6.flowi6_oif = oif;
+ }
+
+ if (sk)
+ mark = (sk->sk_state == TCP_TIME_WAIT) ?
+ inet_twsk(sk)->tw_mark : sk->sk_mark;
+ fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark) ?: mark;
+ fl6.fl6_dport = t1->dest;
+ fl6.fl6_sport = t1->source;
+ fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL);
+ security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
+
+ /* Pass a socket to ip6_dst_lookup either it is for RST
+ * Underlying function will use this to retrieve the network
+ * namespace
+ */
+ dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);
+ if (!IS_ERR(dst)) {
+ skb_dst_set(buff, dst);
+ ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, tclass);
+ TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
+ if (rst)
+ TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
+ return;
+ }
+
+ kfree_skb(buff);
+}
+
+static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
+{
+ const struct tcphdr *th = tcp_hdr(skb);
+ u32 seq = 0, ack_seq = 0;
+ struct tcp_md5sig_key *key = NULL;
+#ifdef CONFIG_TCP_MD5SIG
+ const __u8 *hash_location = NULL;
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ unsigned char newhash[16];
+ int genhash;
+ struct sock *sk1 = NULL;
+#endif
+ int oif = 0;
+
+ if (th->rst)
+ return;
+
+ /* If sk not NULL, it means we did a successful lookup and incoming
+ * route had to be correct. prequeue might have dropped our dst.
+ */
+ if (!sk && !ipv6_unicast_destination(skb))
+ return;
+
+#ifdef CONFIG_TCP_MD5SIG
+ rcu_read_lock();
+ hash_location = tcp_parse_md5sig_option(th);
+ if (sk && sk_fullsock(sk)) {
+ key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr);
+ } else if (hash_location) {
+ /*
+ * active side is lost. Try to find listening socket through
+ * source port, and then find md5 key through listening socket.
+ * we are not loose security here:
+ * Incoming packet is checked with md5 hash with finding key,
+ * no RST generated if md5 hash doesn't match.
+ */
+ sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
+ &tcp_hashinfo, NULL, 0,
+ &ipv6h->saddr,
+ th->source, &ipv6h->daddr,
+ ntohs(th->source),
+ tcp_v6_iif_l3_slave(skb),
+ tcp_v6_sdif(skb));
+ if (!sk1)
+ goto out;
+
+ key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
+ if (!key)
+ goto out;
+
+ genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb);
+ if (genhash || memcmp(hash_location, newhash, 16) != 0)
+ goto out;
+ }
+#endif
+
+ if (th->ack)
+ seq = ntohl(th->ack_seq);
+ else
+ ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
+ (th->doff << 2);
+
+ if (sk) {
+ oif = sk->sk_bound_dev_if;
+ if (sk_fullsock(sk))
+ trace_tcp_send_reset(sk, skb);
+ }
+
+ tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0);
+
+#ifdef CONFIG_TCP_MD5SIG
+out:
+ rcu_read_unlock();
+#endif
+}
+
+static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq,
+ u32 ack, u32 win, u32 tsval, u32 tsecr, int oif,
+ struct tcp_md5sig_key *key, u8 tclass,
+ __be32 label)
+{
+ tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0,
+ tclass, label);
+}
+
+static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
+{
+ struct inet_timewait_sock *tw = inet_twsk(sk);
+ struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
+
+ tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
+ tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
+ tcp_time_stamp_raw() + tcptw->tw_ts_offset,
+ tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
+ tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel));
+
+ inet_twsk_put(tw);
+}
+
+static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
+ struct request_sock *req)
+{
+ /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
+ * sk->sk_state == TCP_SYN_RECV -> for Fast Open.
+ */
+ /* RFC 7323 2.3
+ * The window field (SEG.WND) of every outgoing segment, with the
+ * exception of <SYN> segments, MUST be right-shifted by
+ * Rcv.Wind.Shift bits:
+ */
+ tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ?
+ tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
+ tcp_rsk(req)->rcv_nxt,
+ req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
+ tcp_time_stamp_raw() + tcp_rsk(req)->ts_off,
+ req->ts_recent, sk->sk_bound_dev_if,
+ tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr),
+ 0, 0);
+}
+
+
+static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb)
+{
+#ifdef CONFIG_SYN_COOKIES
+ const struct tcphdr *th = tcp_hdr(skb);
+
+ if (!th->syn)
+ sk = cookie_v6_check(sk, skb);
+#endif
+ return sk;
+}
+
+static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
+{
+ if (skb->protocol == htons(ETH_P_IP))
+ return tcp_v4_conn_request(sk, skb);
+
+ if (!ipv6_unicast_destination(skb))
+ goto drop;
+
+ return tcp_conn_request(&tcp6_request_sock_ops,
+ &tcp_request_sock_ipv6_ops, sk, skb);
+
+drop:
+ tcp_listendrop(sk);
+ return 0; /* don't send reset */
+}
+
+static void tcp_v6_restore_cb(struct sk_buff *skb)
+{
+ /* We need to move header back to the beginning if xfrm6_policy_check()
+ * and tcp_v6_fill_cb() are going to be called again.
+ * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there.
+ */
+ memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6,
+ sizeof(struct inet6_skb_parm));
+}
+
+static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
+ struct request_sock *req,
+ struct dst_entry *dst,
+ struct request_sock *req_unhash,
+ bool *own_req)
+{
+ struct inet_request_sock *ireq;
+ struct ipv6_pinfo *newnp;
+ const struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_txoptions *opt;
+ struct tcp6_sock *newtcp6sk;
+ struct inet_sock *newinet;
+ struct tcp_sock *newtp;
+ struct sock *newsk;
+#ifdef CONFIG_TCP_MD5SIG
+ struct tcp_md5sig_key *key;
+#endif
+ struct flowi6 fl6;
+
+ if (skb->protocol == htons(ETH_P_IP)) {
+ /*
+ * v6 mapped
+ */
+
+ newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst,
+ req_unhash, own_req);
+
+ if (!newsk)
+ return NULL;
+
+ newtcp6sk = (struct tcp6_sock *)newsk;
+ inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
+
+ newinet = inet_sk(newsk);
+ newnp = inet6_sk(newsk);
+ newtp = tcp_sk(newsk);
+
+ memcpy(newnp, np, sizeof(struct ipv6_pinfo));
+
+ newnp->saddr = newsk->sk_v6_rcv_saddr;
+
+ inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
+ newsk->sk_backlog_rcv = tcp_v4_do_rcv;
+#ifdef CONFIG_TCP_MD5SIG
+ newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
+#endif
+
+ newnp->ipv6_mc_list = NULL;
+ newnp->ipv6_ac_list = NULL;
+ newnp->ipv6_fl_list = NULL;
+ newnp->pktoptions = NULL;
+ newnp->opt = NULL;
+ newnp->mcast_oif = tcp_v6_iif(skb);
+ newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
+ newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
+ if (np->repflow)
+ newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
+
+ /*
+ * No need to charge this sock to the relevant IPv6 refcnt debug socks count
+ * here, tcp_create_openreq_child now does this for us, see the comment in
+ * that function for the gory details. -acme
+ */
+
+ /* It is tricky place. Until this moment IPv4 tcp
+ worked with IPv6 icsk.icsk_af_ops.
+ Sync it now.
+ */
+ tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
+
+ return newsk;
+ }
+
+ ireq = inet_rsk(req);
+
+ if (sk_acceptq_is_full(sk))
+ goto out_overflow;
+
+ if (!dst) {
+ dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP);
+ if (!dst)
+ goto out;
+ }
+
+ newsk = tcp_create_openreq_child(sk, req, skb);
+ if (!newsk)
+ goto out_nonewsk;
+
+ /*
+ * No need to charge this sock to the relevant IPv6 refcnt debug socks
+ * count here, tcp_create_openreq_child now does this for us, see the
+ * comment in that function for the gory details. -acme
+ */
+
+ newsk->sk_gso_type = SKB_GSO_TCPV6;
+ ip6_dst_store(newsk, dst, NULL, NULL);
+ inet6_sk_rx_dst_set(newsk, skb);
+
+ newtcp6sk = (struct tcp6_sock *)newsk;
+ inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
+
+ newtp = tcp_sk(newsk);
+ newinet = inet_sk(newsk);
+ newnp = inet6_sk(newsk);
+
+ memcpy(newnp, np, sizeof(struct ipv6_pinfo));
+
+ newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
+ newnp->saddr = ireq->ir_v6_loc_addr;
+ newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
+ newsk->sk_bound_dev_if = ireq->ir_iif;
+
+ /* Now IPv6 options...
+
+ First: no IPv4 options.
+ */
+ newinet->inet_opt = NULL;
+ newnp->ipv6_mc_list = NULL;
+ newnp->ipv6_ac_list = NULL;
+ newnp->ipv6_fl_list = NULL;
+
+ /* Clone RX bits */
+ newnp->rxopt.all = np->rxopt.all;
+
+ newnp->pktoptions = NULL;
+ newnp->opt = NULL;
+ newnp->mcast_oif = tcp_v6_iif(skb);
+ newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
+ newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
+ if (np->repflow)
+ newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
+
+ /* Clone native IPv6 options from listening socket (if any)
+
+ Yes, keeping reference count would be much more clever,
+ but we make one more one thing there: reattach optmem
+ to newsk.
+ */
+ opt = ireq->ipv6_opt;
+ if (!opt)
+ opt = rcu_dereference(np->opt);
+ if (opt) {
+ opt = ipv6_dup_options(newsk, opt);
+ RCU_INIT_POINTER(newnp->opt, opt);
+ }
+ inet_csk(newsk)->icsk_ext_hdr_len = 0;
+ if (opt)
+ inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
+ opt->opt_flen;
+
+ tcp_ca_openreq_child(newsk, dst);
+
+ tcp_sync_mss(newsk, dst_mtu(dst));
+ newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst));
+
+ tcp_initialize_rcv_mss(newsk);
+
+ newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
+ newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
+
+#ifdef CONFIG_TCP_MD5SIG
+ /* Copy over the MD5 key from the original socket */
+ key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr);
+ if (key) {
+ /* We're using one, so create a matching key
+ * on the newsk structure. If we fail to get
+ * memory, then we end up not copying the key
+ * across. Shucks.
+ */
+ tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
+ AF_INET6, 128, key->key, key->keylen,
+ sk_gfp_mask(sk, GFP_ATOMIC));
+ }
+#endif
+
+ if (__inet_inherit_port(sk, newsk) < 0) {
+ inet_csk_prepare_forced_close(newsk);
+ tcp_done(newsk);
+ goto out;
+ }
+ *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
+ if (*own_req) {
+ tcp_move_syn(newtp, req);
+
+ /* Clone pktoptions received with SYN, if we own the req */
+ if (ireq->pktopts) {
+ newnp->pktoptions = skb_clone(ireq->pktopts,
+ sk_gfp_mask(sk, GFP_ATOMIC));
+ consume_skb(ireq->pktopts);
+ ireq->pktopts = NULL;
+ if (newnp->pktoptions) {
+ tcp_v6_restore_cb(newnp->pktoptions);
+ skb_set_owner_r(newnp->pktoptions, newsk);
+ }
+ }
+ }
+
+ return newsk;
+
+out_overflow:
+ __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
+out_nonewsk:
+ dst_release(dst);
+out:
+ tcp_listendrop(sk);
+ return NULL;
+}
+
+/* The socket must have it's spinlock held when we get
+ * here, unless it is a TCP_LISTEN socket.
+ *
+ * We have a potential double-lock case here, so even when
+ * doing backlog processing we use the BH locking scheme.
+ * This is because we cannot sleep with the original spinlock
+ * held.
+ */
+static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct tcp_sock *tp;
+ struct sk_buff *opt_skb = NULL;
+
+ /* Imagine: socket is IPv6. IPv4 packet arrives,
+ goes to IPv4 receive handler and backlogged.
+ From backlog it always goes here. Kerboom...
+ Fortunately, tcp_rcv_established and rcv_established
+ handle them correctly, but it is not case with
+ tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
+ */
+
+ if (skb->protocol == htons(ETH_P_IP))
+ return tcp_v4_do_rcv(sk, skb);
+
+ /*
+ * socket locking is here for SMP purposes as backlog rcv
+ * is currently called with bh processing disabled.
+ */
+
+ /* Do Stevens' IPV6_PKTOPTIONS.
+
+ Yes, guys, it is the only place in our code, where we
+ may make it not affecting IPv4.
+ The rest of code is protocol independent,
+ and I do not like idea to uglify IPv4.
+
+ Actually, all the idea behind IPV6_PKTOPTIONS
+ looks not very well thought. For now we latch
+ options, received in the last packet, enqueued
+ by tcp. Feel free to propose better solution.
+ --ANK (980728)
+ */
+ if (np->rxopt.all)
+ opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC));
+
+ if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
+ struct dst_entry *dst = sk->sk_rx_dst;
+
+ sock_rps_save_rxhash(sk, skb);
+ sk_mark_napi_id(sk, skb);
+ if (dst) {
+ if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
+ dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
+ dst_release(dst);
+ sk->sk_rx_dst = NULL;
+ }
+ }
+
+ tcp_rcv_established(sk, skb);
+ if (opt_skb)
+ goto ipv6_pktoptions;
+ return 0;
+ }
+
+ if (tcp_checksum_complete(skb))
+ goto csum_err;
+
+ if (sk->sk_state == TCP_LISTEN) {
+ struct sock *nsk = tcp_v6_cookie_check(sk, skb);
+
+ if (!nsk)
+ goto discard;
+
+ if (nsk != sk) {
+ if (tcp_child_process(sk, nsk, skb))
+ goto reset;
+ if (opt_skb)
+ __kfree_skb(opt_skb);
+ return 0;
+ }
+ } else
+ sock_rps_save_rxhash(sk, skb);
+
+ if (tcp_rcv_state_process(sk, skb))
+ goto reset;
+ if (opt_skb)
+ goto ipv6_pktoptions;
+ return 0;
+
+reset:
+ tcp_v6_send_reset(sk, skb);
+discard:
+ if (opt_skb)
+ __kfree_skb(opt_skb);
+ kfree_skb(skb);
+ return 0;
+csum_err:
+ TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS);
+ TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);
+ goto discard;
+
+
+ipv6_pktoptions:
+ /* Do you ask, what is it?
+
+ 1. skb was enqueued by tcp.
+ 2. skb is added to tail of read queue, rather than out of order.
+ 3. socket is not in passive state.
+ 4. Finally, it really contains options, which user wants to receive.
+ */
+ tp = tcp_sk(sk);
+ if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
+ !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
+ if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
+ np->mcast_oif = tcp_v6_iif(opt_skb);
+ if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
+ np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
+ if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
+ np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
+ if (np->repflow)
+ np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
+ if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) {
+ skb_set_owner_r(opt_skb, sk);
+ tcp_v6_restore_cb(opt_skb);
+ opt_skb = xchg(&np->pktoptions, opt_skb);
+ } else {
+ __kfree_skb(opt_skb);
+ opt_skb = xchg(&np->pktoptions, NULL);
+ }
+ }
+
+ kfree_skb(opt_skb);
+ return 0;
+}
+
+static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr,
+ const struct tcphdr *th)
+{
+ /* This is tricky: we move IP6CB at its correct location into
+ * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because
+ * _decode_session6() uses IP6CB().
+ * barrier() makes sure compiler won't play aliasing games.
+ */
+ memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb),
+ sizeof(struct inet6_skb_parm));
+ barrier();
+
+ TCP_SKB_CB(skb)->seq = ntohl(th->seq);
+ TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
+ skb->len - th->doff*4);
+ TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
+ TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th);
+ TCP_SKB_CB(skb)->tcp_tw_isn = 0;
+ TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
+ TCP_SKB_CB(skb)->sacked = 0;
+ TCP_SKB_CB(skb)->has_rxtstamp =
+ skb->tstamp || skb_hwtstamps(skb)->hwtstamp;
+}
+
+static int tcp_v6_rcv(struct sk_buff *skb)
+{
+ int sdif = inet6_sdif(skb);
+ const struct tcphdr *th;
+ const struct ipv6hdr *hdr;
+ bool refcounted;
+ struct sock *sk;
+ int ret;
+ struct net *net = dev_net(skb->dev);
+
+ if (skb->pkt_type != PACKET_HOST)
+ goto discard_it;
+
+ /*
+ * Count it even if it's bad.
+ */
+ __TCP_INC_STATS(net, TCP_MIB_INSEGS);
+
+ if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
+ goto discard_it;
+
+ th = (const struct tcphdr *)skb->data;
+
+ if (unlikely(th->doff < sizeof(struct tcphdr)/4))
+ goto bad_packet;
+ if (!pskb_may_pull(skb, th->doff*4))
+ goto discard_it;
+
+ if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo))
+ goto csum_error;
+
+ th = (const struct tcphdr *)skb->data;
+ hdr = ipv6_hdr(skb);
+
+lookup:
+ sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th),
+ th->source, th->dest, inet6_iif(skb), sdif,
+ &refcounted);
+ if (!sk)
+ goto no_tcp_socket;
+
+process:
+ if (sk->sk_state == TCP_TIME_WAIT)
+ goto do_time_wait;
+
+ if (sk->sk_state == TCP_NEW_SYN_RECV) {
+ struct request_sock *req = inet_reqsk(sk);
+ bool req_stolen = false;
+ struct sock *nsk;
+
+ sk = req->rsk_listener;
+ if (tcp_v6_inbound_md5_hash(sk, skb)) {
+ sk_drops_add(sk, skb);
+ reqsk_put(req);
+ goto discard_it;
+ }
+ if (tcp_checksum_complete(skb)) {
+ reqsk_put(req);
+ goto csum_error;
+ }
+ if (unlikely(sk->sk_state != TCP_LISTEN)) {
+ inet_csk_reqsk_queue_drop_and_put(sk, req);
+ goto lookup;
+ }
+ sock_hold(sk);
+ refcounted = true;
+ nsk = NULL;
+ if (!tcp_filter(sk, skb)) {
+ th = (const struct tcphdr *)skb->data;
+ hdr = ipv6_hdr(skb);
+ tcp_v6_fill_cb(skb, hdr, th);
+ nsk = tcp_check_req(sk, skb, req, false, &req_stolen);
+ }
+ if (!nsk) {
+ reqsk_put(req);
+ if (req_stolen) {
+ /* Another cpu got exclusive access to req
+ * and created a full blown socket.
+ * Try to feed this packet to this socket
+ * instead of discarding it.
+ */
+ tcp_v6_restore_cb(skb);
+ sock_put(sk);
+ goto lookup;
+ }
+ goto discard_and_relse;
+ }
+ if (nsk == sk) {
+ reqsk_put(req);
+ tcp_v6_restore_cb(skb);
+ } else if (tcp_child_process(sk, nsk, skb)) {
+ tcp_v6_send_reset(nsk, skb);
+ goto discard_and_relse;
+ } else {
+ sock_put(sk);
+ return 0;
+ }
+ }
+ if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
+ __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
+ goto discard_and_relse;
+ }
+
+ if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
+ goto discard_and_relse;
+
+ if (tcp_v6_inbound_md5_hash(sk, skb))
+ goto discard_and_relse;
+
+ if (tcp_filter(sk, skb))
+ goto discard_and_relse;
+ th = (const struct tcphdr *)skb->data;
+ hdr = ipv6_hdr(skb);
+ tcp_v6_fill_cb(skb, hdr, th);
+
+ skb->dev = NULL;
+
+ if (sk->sk_state == TCP_LISTEN) {
+ ret = tcp_v6_do_rcv(sk, skb);
+ goto put_and_return;
+ }
+
+ sk_incoming_cpu_update(sk);
+
+ bh_lock_sock_nested(sk);
+ tcp_segs_in(tcp_sk(sk), skb);
+ ret = 0;
+ if (!sock_owned_by_user(sk)) {
+ ret = tcp_v6_do_rcv(sk, skb);
+ } else if (tcp_add_backlog(sk, skb)) {
+ goto discard_and_relse;
+ }
+ bh_unlock_sock(sk);
+
+put_and_return:
+ if (refcounted)
+ sock_put(sk);
+ return ret ? -1 : 0;
+
+no_tcp_socket:
+ if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
+ goto discard_it;
+
+ tcp_v6_fill_cb(skb, hdr, th);
+
+ if (tcp_checksum_complete(skb)) {
+csum_error:
+ __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS);
+bad_packet:
+ __TCP_INC_STATS(net, TCP_MIB_INERRS);
+ } else {
+ tcp_v6_send_reset(NULL, skb);
+ }
+
+discard_it:
+ kfree_skb(skb);
+ return 0;
+
+discard_and_relse:
+ sk_drops_add(sk, skb);
+ if (refcounted)
+ sock_put(sk);
+ goto discard_it;
+
+do_time_wait:
+ if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
+ inet_twsk_put(inet_twsk(sk));
+ goto discard_it;
+ }
+
+ tcp_v6_fill_cb(skb, hdr, th);
+
+ if (tcp_checksum_complete(skb)) {
+ inet_twsk_put(inet_twsk(sk));
+ goto csum_error;
+ }
+
+ switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
+ case TCP_TW_SYN:
+ {
+ struct sock *sk2;
+
+ sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
+ skb, __tcp_hdrlen(th),
+ &ipv6_hdr(skb)->saddr, th->source,
+ &ipv6_hdr(skb)->daddr,
+ ntohs(th->dest),
+ tcp_v6_iif_l3_slave(skb),
+ sdif);
+ if (sk2) {
+ struct inet_timewait_sock *tw = inet_twsk(sk);
+ inet_twsk_deschedule_put(tw);
+ sk = sk2;
+ tcp_v6_restore_cb(skb);
+ refcounted = false;
+ goto process;
+ }
+ }
+ /* to ACK */
+ /* fall through */
+ case TCP_TW_ACK:
+ tcp_v6_timewait_ack(sk, skb);
+ break;
+ case TCP_TW_RST:
+ tcp_v6_send_reset(sk, skb);
+ inet_twsk_deschedule_put(inet_twsk(sk));
+ goto discard_it;
+ case TCP_TW_SUCCESS:
+ ;
+ }
+ goto discard_it;
+}
+
+static void tcp_v6_early_demux(struct sk_buff *skb)
+{
+ const struct ipv6hdr *hdr;
+ const struct tcphdr *th;
+ struct sock *sk;
+
+ if (skb->pkt_type != PACKET_HOST)
+ return;
+
+ if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
+ return;
+
+ hdr = ipv6_hdr(skb);
+ th = tcp_hdr(skb);
+
+ if (th->doff < sizeof(struct tcphdr) / 4)
+ return;
+
+ /* Note : We use inet6_iif() here, not tcp_v6_iif() */
+ sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
+ &hdr->saddr, th->source,
+ &hdr->daddr, ntohs(th->dest),
+ inet6_iif(skb), inet6_sdif(skb));
+ if (sk) {
+ skb->sk = sk;
+ skb->destructor = sock_edemux;
+ if (sk_fullsock(sk)) {
+ struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst);
+
+ if (dst)
+ dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
+ if (dst &&
+ inet_sk(sk)->rx_dst_ifindex == skb->skb_iif)
+ skb_dst_set_noref(skb, dst);
+ }
+ }
+}
+
+static struct timewait_sock_ops tcp6_timewait_sock_ops = {
+ .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
+ .twsk_unique = tcp_twsk_unique,
+ .twsk_destructor = tcp_twsk_destructor,
+};
+
+static const struct inet_connection_sock_af_ops ipv6_specific = {
+ .queue_xmit = inet6_csk_xmit,
+ .send_check = tcp_v6_send_check,
+ .rebuild_header = inet6_sk_rebuild_header,
+ .sk_rx_dst_set = inet6_sk_rx_dst_set,
+ .conn_request = tcp_v6_conn_request,
+ .syn_recv_sock = tcp_v6_syn_recv_sock,
+ .net_header_len = sizeof(struct ipv6hdr),
+ .net_frag_header_len = sizeof(struct frag_hdr),
+ .setsockopt = ipv6_setsockopt,
+ .getsockopt = ipv6_getsockopt,
+ .addr2sockaddr = inet6_csk_addr2sockaddr,
+ .sockaddr_len = sizeof(struct sockaddr_in6),
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_ipv6_setsockopt,
+ .compat_getsockopt = compat_ipv6_getsockopt,
+#endif
+ .mtu_reduced = tcp_v6_mtu_reduced,
+};
+
+#ifdef CONFIG_TCP_MD5SIG
+static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
+ .md5_lookup = tcp_v6_md5_lookup,
+ .calc_md5_hash = tcp_v6_md5_hash_skb,
+ .md5_parse = tcp_v6_parse_md5_keys,
+};
+#endif
+
+/*
+ * TCP over IPv4 via INET6 API
+ */
+static const struct inet_connection_sock_af_ops ipv6_mapped = {
+ .queue_xmit = ip_queue_xmit,
+ .send_check = tcp_v4_send_check,
+ .rebuild_header = inet_sk_rebuild_header,
+ .sk_rx_dst_set = inet_sk_rx_dst_set,
+ .conn_request = tcp_v6_conn_request,
+ .syn_recv_sock = tcp_v6_syn_recv_sock,
+ .net_header_len = sizeof(struct iphdr),
+ .setsockopt = ipv6_setsockopt,
+ .getsockopt = ipv6_getsockopt,
+ .addr2sockaddr = inet6_csk_addr2sockaddr,
+ .sockaddr_len = sizeof(struct sockaddr_in6),
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_ipv6_setsockopt,
+ .compat_getsockopt = compat_ipv6_getsockopt,
+#endif
+ .mtu_reduced = tcp_v4_mtu_reduced,
+};
+
+#ifdef CONFIG_TCP_MD5SIG
+static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
+ .md5_lookup = tcp_v4_md5_lookup,
+ .calc_md5_hash = tcp_v4_md5_hash_skb,
+ .md5_parse = tcp_v6_parse_md5_keys,
+};
+#endif
+
+/* NOTE: A lot of things set to zero explicitly by call to
+ * sk_alloc() so need not be done here.
+ */
+static int tcp_v6_init_sock(struct sock *sk)
+{
+ struct inet_connection_sock *icsk = inet_csk(sk);
+
+ tcp_init_sock(sk);
+
+ icsk->icsk_af_ops = &ipv6_specific;
+
+#ifdef CONFIG_TCP_MD5SIG
+ tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
+#endif
+
+ return 0;
+}
+
+static void tcp_v6_destroy_sock(struct sock *sk)
+{
+ tcp_v4_destroy_sock(sk);
+ inet6_destroy_sock(sk);
+}
+
+#ifdef CONFIG_PROC_FS
+/* Proc filesystem TCPv6 sock list dumping. */
+static void get_openreq6(struct seq_file *seq,
+ const struct request_sock *req, int i)
+{
+ long ttd = req->rsk_timer.expires - jiffies;
+ const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr;
+ const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr;
+
+ if (ttd < 0)
+ ttd = 0;
+
+ seq_printf(seq,
+ "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
+ "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n",
+ i,
+ src->s6_addr32[0], src->s6_addr32[1],
+ src->s6_addr32[2], src->s6_addr32[3],
+ inet_rsk(req)->ir_num,
+ dest->s6_addr32[0], dest->s6_addr32[1],
+ dest->s6_addr32[2], dest->s6_addr32[3],
+ ntohs(inet_rsk(req)->ir_rmt_port),
+ TCP_SYN_RECV,
+ 0, 0, /* could print option size, but that is af dependent. */
+ 1, /* timers active (only the expire timer) */
+ jiffies_to_clock_t(ttd),
+ req->num_timeout,
+ from_kuid_munged(seq_user_ns(seq),
+ sock_i_uid(req->rsk_listener)),
+ 0, /* non standard timer */
+ 0, /* open_requests have no inode */
+ 0, req);
+}
+
+static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
+{
+ const struct in6_addr *dest, *src;
+ __u16 destp, srcp;
+ int timer_active;
+ unsigned long timer_expires;
+ const struct inet_sock *inet = inet_sk(sp);
+ const struct tcp_sock *tp = tcp_sk(sp);
+ const struct inet_connection_sock *icsk = inet_csk(sp);
+ const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq;
+ int rx_queue;
+ int state;
+
+ dest = &sp->sk_v6_daddr;
+ src = &sp->sk_v6_rcv_saddr;
+ destp = ntohs(inet->inet_dport);
+ srcp = ntohs(inet->inet_sport);
+
+ if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
+ icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
+ icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
+ timer_active = 1;
+ timer_expires = icsk->icsk_timeout;
+ } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
+ timer_active = 4;
+ timer_expires = icsk->icsk_timeout;
+ } else if (timer_pending(&sp->sk_timer)) {
+ timer_active = 2;
+ timer_expires = sp->sk_timer.expires;
+ } else {
+ timer_active = 0;
+ timer_expires = jiffies;
+ }
+
+ state = inet_sk_state_load(sp);
+ if (state == TCP_LISTEN)
+ rx_queue = sp->sk_ack_backlog;
+ else
+ /* Because we don't lock the socket,
+ * we might find a transient negative value.
+ */
+ rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
+
+ seq_printf(seq,
+ "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
+ "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n",
+ i,
+ src->s6_addr32[0], src->s6_addr32[1],
+ src->s6_addr32[2], src->s6_addr32[3], srcp,
+ dest->s6_addr32[0], dest->s6_addr32[1],
+ dest->s6_addr32[2], dest->s6_addr32[3], destp,
+ state,
+ tp->write_seq - tp->snd_una,
+ rx_queue,
+ timer_active,
+ jiffies_delta_to_clock_t(timer_expires - jiffies),
+ icsk->icsk_retransmits,
+ from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
+ icsk->icsk_probes_out,
+ sock_i_ino(sp),
+ refcount_read(&sp->sk_refcnt), sp,
+ jiffies_to_clock_t(icsk->icsk_rto),
+ jiffies_to_clock_t(icsk->icsk_ack.ato),
+ (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong,
+ tp->snd_cwnd,
+ state == TCP_LISTEN ?
+ fastopenq->max_qlen :
+ (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)
+ );
+}
+
+static void get_timewait6_sock(struct seq_file *seq,
+ struct inet_timewait_sock *tw, int i)
+{
+ long delta = tw->tw_timer.expires - jiffies;
+ const struct in6_addr *dest, *src;
+ __u16 destp, srcp;
+
+ dest = &tw->tw_v6_daddr;
+ src = &tw->tw_v6_rcv_saddr;
+ destp = ntohs(tw->tw_dport);
+ srcp = ntohs(tw->tw_sport);
+
+ seq_printf(seq,
+ "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
+ "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
+ i,
+ src->s6_addr32[0], src->s6_addr32[1],
+ src->s6_addr32[2], src->s6_addr32[3], srcp,
+ dest->s6_addr32[0], dest->s6_addr32[1],
+ dest->s6_addr32[2], dest->s6_addr32[3], destp,
+ tw->tw_substate, 0, 0,
+ 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0,
+ refcount_read(&tw->tw_refcnt), tw);
+}
+
+static int tcp6_seq_show(struct seq_file *seq, void *v)
+{
+ struct tcp_iter_state *st;
+ struct sock *sk = v;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq,
+ " sl "
+ "local_address "
+ "remote_address "
+ "st tx_queue rx_queue tr tm->when retrnsmt"
+ " uid timeout inode\n");
+ goto out;
+ }
+ st = seq->private;
+
+ if (sk->sk_state == TCP_TIME_WAIT)
+ get_timewait6_sock(seq, v, st->num);
+ else if (sk->sk_state == TCP_NEW_SYN_RECV)
+ get_openreq6(seq, v, st->num);
+ else
+ get_tcp6_sock(seq, v, st->num);
+out:
+ return 0;
+}
+
+static const struct seq_operations tcp6_seq_ops = {
+ .show = tcp6_seq_show,
+ .start = tcp_seq_start,
+ .next = tcp_seq_next,
+ .stop = tcp_seq_stop,
+};
+
+static struct tcp_seq_afinfo tcp6_seq_afinfo = {
+ .family = AF_INET6,
+};
+
+int __net_init tcp6_proc_init(struct net *net)
+{
+ if (!proc_create_net_data("tcp6", 0444, net->proc_net, &tcp6_seq_ops,
+ sizeof(struct tcp_iter_state), &tcp6_seq_afinfo))
+ return -ENOMEM;
+ return 0;
+}
+
+void tcp6_proc_exit(struct net *net)
+{
+ remove_proc_entry("tcp6", net->proc_net);
+}
+#endif
+
+struct proto tcpv6_prot = {
+ .name = "TCPv6",
+ .owner = THIS_MODULE,
+ .close = tcp_close,
+ .pre_connect = tcp_v6_pre_connect,
+ .connect = tcp_v6_connect,
+ .disconnect = tcp_disconnect,
+ .accept = inet_csk_accept,
+ .ioctl = tcp_ioctl,
+ .init = tcp_v6_init_sock,
+ .destroy = tcp_v6_destroy_sock,
+ .shutdown = tcp_shutdown,
+ .setsockopt = tcp_setsockopt,
+ .getsockopt = tcp_getsockopt,
+ .keepalive = tcp_set_keepalive,
+ .recvmsg = tcp_recvmsg,
+ .sendmsg = tcp_sendmsg,
+ .sendpage = tcp_sendpage,
+ .backlog_rcv = tcp_v6_do_rcv,
+ .release_cb = tcp_release_cb,
+ .hash = inet6_hash,
+ .unhash = inet_unhash,
+ .get_port = inet_csk_get_port,
+ .enter_memory_pressure = tcp_enter_memory_pressure,
+ .leave_memory_pressure = tcp_leave_memory_pressure,
+ .stream_memory_free = tcp_stream_memory_free,
+ .sockets_allocated = &tcp_sockets_allocated,
+ .memory_allocated = &tcp_memory_allocated,
+ .memory_pressure = &tcp_memory_pressure,
+ .orphan_count = &tcp_orphan_count,
+ .sysctl_mem = sysctl_tcp_mem,
+ .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem),
+ .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem),
+ .max_header = MAX_TCP_HEADER,
+ .obj_size = sizeof(struct tcp6_sock),
+ .slab_flags = SLAB_TYPESAFE_BY_RCU,
+ .twsk_prot = &tcp6_timewait_sock_ops,
+ .rsk_prot = &tcp6_request_sock_ops,
+ .h.hashinfo = &tcp_hashinfo,
+ .no_autobind = true,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_tcp_setsockopt,
+ .compat_getsockopt = compat_tcp_getsockopt,
+#endif
+ .diag_destroy = tcp_abort,
+};
+
+/* thinking of making this const? Don't.
+ * early_demux can change based on sysctl.
+ */
+static struct inet6_protocol tcpv6_protocol = {
+ .early_demux = tcp_v6_early_demux,
+ .early_demux_handler = tcp_v6_early_demux,
+ .handler = tcp_v6_rcv,
+ .err_handler = tcp_v6_err,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+static struct inet_protosw tcpv6_protosw = {
+ .type = SOCK_STREAM,
+ .protocol = IPPROTO_TCP,
+ .prot = &tcpv6_prot,
+ .ops = &inet6_stream_ops,
+ .flags = INET_PROTOSW_PERMANENT |
+ INET_PROTOSW_ICSK,
+};
+
+static int __net_init tcpv6_net_init(struct net *net)
+{
+ return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
+ SOCK_RAW, IPPROTO_TCP, net);
+}
+
+static void __net_exit tcpv6_net_exit(struct net *net)
+{
+ inet_ctl_sock_destroy(net->ipv6.tcp_sk);
+}
+
+static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
+{
+ inet_twsk_purge(&tcp_hashinfo, AF_INET6);
+}
+
+static struct pernet_operations tcpv6_net_ops = {
+ .init = tcpv6_net_init,
+ .exit = tcpv6_net_exit,
+ .exit_batch = tcpv6_net_exit_batch,
+};
+
+int __init tcpv6_init(void)
+{
+ int ret;
+
+ ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
+ if (ret)
+ goto out;
+
+ /* register inet6 protocol */
+ ret = inet6_register_protosw(&tcpv6_protosw);
+ if (ret)
+ goto out_tcpv6_protocol;
+
+ ret = register_pernet_subsys(&tcpv6_net_ops);
+ if (ret)
+ goto out_tcpv6_protosw;
+out:
+ return ret;
+
+out_tcpv6_protosw:
+ inet6_unregister_protosw(&tcpv6_protosw);
+out_tcpv6_protocol:
+ inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
+ goto out;
+}
+
+void tcpv6_exit(void)
+{
+ unregister_pernet_subsys(&tcpv6_net_ops);
+ inet6_unregister_protosw(&tcpv6_protosw);
+ inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
+}
diff --git a/net/ipv6/tcpv6_offload.c b/net/ipv6/tcpv6_offload.c
new file mode 100644
index 0000000..e72947c
--- /dev/null
+++ b/net/ipv6/tcpv6_offload.c
@@ -0,0 +1,81 @@
+/*
+ * IPV6 GSO/GRO offload support
+ * Linux INET6 implementation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * TCPv6 GSO/GRO support
+ */
+#include <linux/skbuff.h>
+#include <net/protocol.h>
+#include <net/tcp.h>
+#include <net/ip6_checksum.h>
+#include "ip6_offload.h"
+
+static struct sk_buff *tcp6_gro_receive(struct list_head *head,
+ struct sk_buff *skb)
+{
+ /* Don't bother verifying checksum if we're going to flush anyway. */
+ if (!NAPI_GRO_CB(skb)->flush &&
+ skb_gro_checksum_validate(skb, IPPROTO_TCP,
+ ip6_gro_compute_pseudo)) {
+ NAPI_GRO_CB(skb)->flush = 1;
+ return NULL;
+ }
+
+ return tcp_gro_receive(head, skb);
+}
+
+static int tcp6_gro_complete(struct sk_buff *skb, int thoff)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct tcphdr *th = tcp_hdr(skb);
+
+ th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
+ &iph->daddr, 0);
+ skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
+
+ return tcp_gro_complete(skb);
+}
+
+static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb,
+ netdev_features_t features)
+{
+ struct tcphdr *th;
+
+ if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6))
+ return ERR_PTR(-EINVAL);
+
+ if (!pskb_may_pull(skb, sizeof(*th)))
+ return ERR_PTR(-EINVAL);
+
+ if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
+ const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ struct tcphdr *th = tcp_hdr(skb);
+
+ /* Set up pseudo header, usually expect stack to have done
+ * this.
+ */
+
+ th->check = 0;
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
+ }
+
+ return tcp_gso_segment(skb, features);
+}
+static const struct net_offload tcpv6_offload = {
+ .callbacks = {
+ .gso_segment = tcp6_gso_segment,
+ .gro_receive = tcp6_gro_receive,
+ .gro_complete = tcp6_gro_complete,
+ },
+};
+
+int __init tcpv6_offload_init(void)
+{
+ return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP);
+}
diff --git a/net/ipv6/tunnel6.c b/net/ipv6/tunnel6.c
new file mode 100644
index 0000000..dae25ca
--- /dev/null
+++ b/net/ipv6/tunnel6.c
@@ -0,0 +1,193 @@
+/*
+ * Copyright (C)2003,2004 USAGI/WIDE Project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors Mitsuru KANDA <mk@linux-ipv6.org>
+ * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/icmpv6.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/xfrm.h>
+
+static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly;
+static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly;
+static DEFINE_MUTEX(tunnel6_mutex);
+
+int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
+{
+ struct xfrm6_tunnel __rcu **pprev;
+ struct xfrm6_tunnel *t;
+ int ret = -EEXIST;
+ int priority = handler->priority;
+
+ mutex_lock(&tunnel6_mutex);
+
+ for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
+ (t = rcu_dereference_protected(*pprev,
+ lockdep_is_held(&tunnel6_mutex))) != NULL;
+ pprev = &t->next) {
+ if (t->priority > priority)
+ break;
+ if (t->priority == priority)
+ goto err;
+ }
+
+ handler->next = *pprev;
+ rcu_assign_pointer(*pprev, handler);
+
+ ret = 0;
+
+err:
+ mutex_unlock(&tunnel6_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(xfrm6_tunnel_register);
+
+int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
+{
+ struct xfrm6_tunnel __rcu **pprev;
+ struct xfrm6_tunnel *t;
+ int ret = -ENOENT;
+
+ mutex_lock(&tunnel6_mutex);
+
+ for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
+ (t = rcu_dereference_protected(*pprev,
+ lockdep_is_held(&tunnel6_mutex))) != NULL;
+ pprev = &t->next) {
+ if (t == handler) {
+ *pprev = handler->next;
+ ret = 0;
+ break;
+ }
+ }
+
+ mutex_unlock(&tunnel6_mutex);
+
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL(xfrm6_tunnel_deregister);
+
+#define for_each_tunnel_rcu(head, handler) \
+ for (handler = rcu_dereference(head); \
+ handler != NULL; \
+ handler = rcu_dereference(handler->next)) \
+
+static int tunnel6_rcv(struct sk_buff *skb)
+{
+ struct xfrm6_tunnel *handler;
+
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ goto drop;
+
+ for_each_tunnel_rcu(tunnel6_handlers, handler)
+ if (!handler->handler(skb))
+ return 0;
+
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int tunnel46_rcv(struct sk_buff *skb)
+{
+ struct xfrm6_tunnel *handler;
+
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ goto drop;
+
+ for_each_tunnel_rcu(tunnel46_handlers, handler)
+ if (!handler->handler(skb))
+ return 0;
+
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct xfrm6_tunnel *handler;
+
+ for_each_tunnel_rcu(tunnel6_handlers, handler)
+ if (!handler->err_handler(skb, opt, type, code, offset, info))
+ break;
+}
+
+static void tunnel46_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct xfrm6_tunnel *handler;
+
+ for_each_tunnel_rcu(tunnel46_handlers, handler)
+ if (!handler->err_handler(skb, opt, type, code, offset, info))
+ break;
+}
+
+static const struct inet6_protocol tunnel6_protocol = {
+ .handler = tunnel6_rcv,
+ .err_handler = tunnel6_err,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+static const struct inet6_protocol tunnel46_protocol = {
+ .handler = tunnel46_rcv,
+ .err_handler = tunnel46_err,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+static int __init tunnel6_init(void)
+{
+ if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
+ pr_err("%s: can't add protocol\n", __func__);
+ return -EAGAIN;
+ }
+ if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
+ pr_err("%s: can't add protocol\n", __func__);
+ inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
+ return -EAGAIN;
+ }
+ return 0;
+}
+
+static void __exit tunnel6_fini(void)
+{
+ if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
+ pr_err("%s: can't remove protocol\n", __func__);
+ if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
+ pr_err("%s: can't remove protocol\n", __func__);
+}
+
+module_init(tunnel6_init);
+module_exit(tunnel6_fini);
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
new file mode 100644
index 0000000..b36694b
--- /dev/null
+++ b/net/ipv6/udp.c
@@ -0,0 +1,1632 @@
+/*
+ * UDP over IPv6
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Based on linux/ipv4/udp.c
+ *
+ * Fixes:
+ * Hideaki YOSHIFUJI : sin6_scope_id support
+ * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
+ * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
+ * a single port at the same time.
+ * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
+ * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include <net/addrconf.h>
+#include <net/ndisc.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+#include <net/raw.h>
+#include <net/tcp_states.h>
+#include <net/ip6_checksum.h>
+#include <net/xfrm.h>
+#include <net/inet_hashtables.h>
+#include <net/inet6_hashtables.h>
+#include <net/busy_poll.h>
+#include <net/sock_reuseport.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <trace/events/skb.h>
+#include "udp_impl.h"
+
+static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb)
+{
+#if defined(CONFIG_NET_L3_MASTER_DEV)
+ if (!net->ipv4.sysctl_udp_l3mdev_accept &&
+ skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
+ return true;
+#endif
+ return false;
+}
+
+static u32 udp6_ehashfn(const struct net *net,
+ const struct in6_addr *laddr,
+ const u16 lport,
+ const struct in6_addr *faddr,
+ const __be16 fport)
+{
+ static u32 udp6_ehash_secret __read_mostly;
+ static u32 udp_ipv6_hash_secret __read_mostly;
+
+ u32 lhash, fhash;
+
+ net_get_random_once(&udp6_ehash_secret,
+ sizeof(udp6_ehash_secret));
+ net_get_random_once(&udp_ipv6_hash_secret,
+ sizeof(udp_ipv6_hash_secret));
+
+ lhash = (__force u32)laddr->s6_addr32[3];
+ fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
+
+ return __inet6_ehashfn(lhash, lport, fhash, fport,
+ udp_ipv6_hash_secret + net_hash_mix(net));
+}
+
+int udp_v6_get_port(struct sock *sk, unsigned short snum)
+{
+ unsigned int hash2_nulladdr =
+ ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
+ unsigned int hash2_partial =
+ ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
+
+ /* precompute partial secondary hash */
+ udp_sk(sk)->udp_portaddr_hash = hash2_partial;
+ return udp_lib_get_port(sk, snum, hash2_nulladdr);
+}
+
+static void udp_v6_rehash(struct sock *sk)
+{
+ u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
+ &sk->sk_v6_rcv_saddr,
+ inet_sk(sk)->inet_num);
+
+ udp_lib_rehash(sk, new_hash);
+}
+
+static int compute_score(struct sock *sk, struct net *net,
+ const struct in6_addr *saddr, __be16 sport,
+ const struct in6_addr *daddr, unsigned short hnum,
+ int dif, int sdif, bool exact_dif)
+{
+ int score;
+ struct inet_sock *inet;
+
+ if (!net_eq(sock_net(sk), net) ||
+ udp_sk(sk)->udp_port_hash != hnum ||
+ sk->sk_family != PF_INET6)
+ return -1;
+
+ score = 0;
+ inet = inet_sk(sk);
+
+ if (inet->inet_dport) {
+ if (inet->inet_dport != sport)
+ return -1;
+ score++;
+ }
+
+ if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
+ if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
+ return -1;
+ score++;
+ }
+
+ if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
+ if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
+ return -1;
+ score++;
+ }
+
+ if (sk->sk_bound_dev_if || exact_dif) {
+ bool dev_match = (sk->sk_bound_dev_if == dif ||
+ sk->sk_bound_dev_if == sdif);
+
+ if (!dev_match)
+ return -1;
+ if (sk->sk_bound_dev_if)
+ score++;
+ }
+
+ if (sk->sk_incoming_cpu == raw_smp_processor_id())
+ score++;
+
+ return score;
+}
+
+/* called with rcu_read_lock() */
+static struct sock *udp6_lib_lookup2(struct net *net,
+ const struct in6_addr *saddr, __be16 sport,
+ const struct in6_addr *daddr, unsigned int hnum,
+ int dif, int sdif, bool exact_dif,
+ struct udp_hslot *hslot2, struct sk_buff *skb)
+{
+ struct sock *sk, *result;
+ int score, badness;
+ u32 hash = 0;
+
+ result = NULL;
+ badness = -1;
+ udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
+ score = compute_score(sk, net, saddr, sport,
+ daddr, hnum, dif, sdif, exact_dif);
+ if (score > badness) {
+ if (sk->sk_reuseport) {
+ hash = udp6_ehashfn(net, daddr, hnum,
+ saddr, sport);
+
+ result = reuseport_select_sock(sk, hash, skb,
+ sizeof(struct udphdr));
+ if (result)
+ return result;
+ }
+ result = sk;
+ badness = score;
+ }
+ }
+ return result;
+}
+
+/* rcu_read_lock() must be held */
+struct sock *__udp6_lib_lookup(struct net *net,
+ const struct in6_addr *saddr, __be16 sport,
+ const struct in6_addr *daddr, __be16 dport,
+ int dif, int sdif, struct udp_table *udptable,
+ struct sk_buff *skb)
+{
+ struct sock *sk, *result;
+ unsigned short hnum = ntohs(dport);
+ unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
+ struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
+ bool exact_dif = udp6_lib_exact_dif_match(net, skb);
+ int score, badness;
+ u32 hash = 0;
+
+ if (hslot->count > 10) {
+ hash2 = ipv6_portaddr_hash(net, daddr, hnum);
+ slot2 = hash2 & udptable->mask;
+ hslot2 = &udptable->hash2[slot2];
+ if (hslot->count < hslot2->count)
+ goto begin;
+
+ result = udp6_lib_lookup2(net, saddr, sport,
+ daddr, hnum, dif, sdif, exact_dif,
+ hslot2, skb);
+ if (!result) {
+ unsigned int old_slot2 = slot2;
+ hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
+ slot2 = hash2 & udptable->mask;
+ /* avoid searching the same slot again. */
+ if (unlikely(slot2 == old_slot2))
+ return result;
+
+ hslot2 = &udptable->hash2[slot2];
+ if (hslot->count < hslot2->count)
+ goto begin;
+
+ result = udp6_lib_lookup2(net, saddr, sport,
+ daddr, hnum, dif, sdif,
+ exact_dif, hslot2,
+ skb);
+ }
+ if (unlikely(IS_ERR(result)))
+ return NULL;
+ return result;
+ }
+begin:
+ result = NULL;
+ badness = -1;
+ sk_for_each_rcu(sk, &hslot->head) {
+ score = compute_score(sk, net, saddr, sport, daddr, hnum, dif,
+ sdif, exact_dif);
+ if (score > badness) {
+ if (sk->sk_reuseport) {
+ hash = udp6_ehashfn(net, daddr, hnum,
+ saddr, sport);
+ result = reuseport_select_sock(sk, hash, skb,
+ sizeof(struct udphdr));
+ if (unlikely(IS_ERR(result)))
+ return NULL;
+ if (result)
+ return result;
+ }
+ result = sk;
+ badness = score;
+ }
+ }
+ return result;
+}
+EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
+
+static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
+ __be16 sport, __be16 dport,
+ struct udp_table *udptable)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+
+ return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
+ &iph->daddr, dport, inet6_iif(skb),
+ inet6_sdif(skb), udptable, skb);
+}
+
+struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
+ __be16 sport, __be16 dport)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+
+ return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
+ &iph->daddr, dport, inet6_iif(skb),
+ inet6_sdif(skb), &udp_table, skb);
+}
+EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
+
+/* Must be called under rcu_read_lock().
+ * Does increment socket refcount.
+ */
+#if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
+struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
+ const struct in6_addr *daddr, __be16 dport, int dif)
+{
+ struct sock *sk;
+
+ sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
+ dif, 0, &udp_table, NULL);
+ if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
+ sk = NULL;
+ return sk;
+}
+EXPORT_SYMBOL_GPL(udp6_lib_lookup);
+#endif
+
+/* do not use the scratch area len for jumbogram: their length execeeds the
+ * scratch area space; note that the IP6CB flags is still in the first
+ * cacheline, so checking for jumbograms is cheap
+ */
+static int udp6_skb_len(struct sk_buff *skb)
+{
+ return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
+}
+
+/*
+ * This should be easy, if there is something there we
+ * return it, otherwise we block.
+ */
+
+int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
+ int noblock, int flags, int *addr_len)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct inet_sock *inet = inet_sk(sk);
+ struct sk_buff *skb;
+ unsigned int ulen, copied;
+ int peeked, peeking, off;
+ int err;
+ int is_udplite = IS_UDPLITE(sk);
+ bool checksum_valid = false;
+ int is_udp4;
+
+ if (flags & MSG_ERRQUEUE)
+ return ipv6_recv_error(sk, msg, len, addr_len);
+
+ if (np->rxpmtu && np->rxopt.bits.rxpmtu)
+ return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
+
+try_again:
+ peeking = flags & MSG_PEEK;
+ off = sk_peek_offset(sk, flags);
+ skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err);
+ if (!skb)
+ return err;
+
+ ulen = udp6_skb_len(skb);
+ copied = len;
+ if (copied > ulen - off)
+ copied = ulen - off;
+ else if (copied < ulen)
+ msg->msg_flags |= MSG_TRUNC;
+
+ is_udp4 = (skb->protocol == htons(ETH_P_IP));
+
+ /*
+ * If checksum is needed at all, try to do it while copying the
+ * data. If the data is truncated, or if we only want a partial
+ * coverage checksum (UDP-Lite), do it before the copy.
+ */
+
+ if (copied < ulen || peeking ||
+ (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
+ checksum_valid = udp_skb_csum_unnecessary(skb) ||
+ !__udp_lib_checksum_complete(skb);
+ if (!checksum_valid)
+ goto csum_copy_err;
+ }
+
+ if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
+ if (udp_skb_is_linear(skb))
+ err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
+ else
+ err = skb_copy_datagram_msg(skb, off, msg, copied);
+ } else {
+ err = skb_copy_and_csum_datagram_msg(skb, off, msg);
+ if (err == -EINVAL)
+ goto csum_copy_err;
+ }
+ if (unlikely(err)) {
+ if (!peeked) {
+ atomic_inc(&sk->sk_drops);
+ if (is_udp4)
+ UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
+ is_udplite);
+ else
+ UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
+ is_udplite);
+ }
+ kfree_skb(skb);
+ return err;
+ }
+ if (!peeked) {
+ if (is_udp4)
+ UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
+ is_udplite);
+ else
+ UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
+ is_udplite);
+ }
+
+ sock_recv_ts_and_drops(msg, sk, skb);
+
+ /* Copy the address. */
+ if (msg->msg_name) {
+ DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = udp_hdr(skb)->source;
+ sin6->sin6_flowinfo = 0;
+
+ if (is_udp4) {
+ ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
+ &sin6->sin6_addr);
+ sin6->sin6_scope_id = 0;
+ } else {
+ sin6->sin6_addr = ipv6_hdr(skb)->saddr;
+ sin6->sin6_scope_id =
+ ipv6_iface_scope_id(&sin6->sin6_addr,
+ inet6_iif(skb));
+ }
+ *addr_len = sizeof(*sin6);
+ }
+
+ if (np->rxopt.all)
+ ip6_datagram_recv_common_ctl(sk, msg, skb);
+
+ if (is_udp4) {
+ if (inet->cmsg_flags)
+ ip_cmsg_recv_offset(msg, sk, skb,
+ sizeof(struct udphdr), off);
+ } else {
+ if (np->rxopt.all)
+ ip6_datagram_recv_specific_ctl(sk, msg, skb);
+ }
+
+ err = copied;
+ if (flags & MSG_TRUNC)
+ err = ulen;
+
+ skb_consume_udp(sk, skb, peeking ? -err : err);
+ return err;
+
+csum_copy_err:
+ if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
+ udp_skb_destructor)) {
+ if (is_udp4) {
+ UDP_INC_STATS(sock_net(sk),
+ UDP_MIB_CSUMERRORS, is_udplite);
+ UDP_INC_STATS(sock_net(sk),
+ UDP_MIB_INERRORS, is_udplite);
+ } else {
+ UDP6_INC_STATS(sock_net(sk),
+ UDP_MIB_CSUMERRORS, is_udplite);
+ UDP6_INC_STATS(sock_net(sk),
+ UDP_MIB_INERRORS, is_udplite);
+ }
+ }
+ kfree_skb(skb);
+
+ /* starting over for a new packet, but check if we need to yield */
+ cond_resched();
+ msg->msg_flags &= ~MSG_TRUNC;
+ goto try_again;
+}
+
+void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info,
+ struct udp_table *udptable)
+{
+ struct ipv6_pinfo *np;
+ const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
+ const struct in6_addr *saddr = &hdr->saddr;
+ const struct in6_addr *daddr = &hdr->daddr;
+ struct udphdr *uh = (struct udphdr *)(skb->data+offset);
+ struct sock *sk;
+ int harderr;
+ int err;
+ struct net *net = dev_net(skb->dev);
+
+ sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
+ inet6_iif(skb), 0, udptable, skb);
+ if (!sk) {
+ __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
+ ICMP6_MIB_INERRORS);
+ return;
+ }
+
+ harderr = icmpv6_err_convert(type, code, &err);
+ np = inet6_sk(sk);
+
+ if (type == ICMPV6_PKT_TOOBIG) {
+ if (!ip6_sk_accept_pmtu(sk))
+ goto out;
+ ip6_sk_update_pmtu(skb, sk, info);
+ if (np->pmtudisc != IPV6_PMTUDISC_DONT)
+ harderr = 1;
+ }
+ if (type == NDISC_REDIRECT) {
+ ip6_sk_redirect(skb, sk);
+ goto out;
+ }
+
+ if (!np->recverr) {
+ if (!harderr || sk->sk_state != TCP_ESTABLISHED)
+ goto out;
+ } else {
+ ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
+ }
+
+ sk->sk_err = err;
+ sk->sk_error_report(sk);
+out:
+ return;
+}
+
+static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+ int rc;
+
+ if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
+ sock_rps_save_rxhash(sk, skb);
+ sk_mark_napi_id(sk, skb);
+ sk_incoming_cpu_update(sk);
+ } else {
+ sk_mark_napi_id_once(sk, skb);
+ }
+
+ rc = __udp_enqueue_schedule_skb(sk, skb);
+ if (rc < 0) {
+ int is_udplite = IS_UDPLITE(sk);
+
+ /* Note that an ENOMEM error is charged twice */
+ if (rc == -ENOMEM)
+ UDP6_INC_STATS(sock_net(sk),
+ UDP_MIB_RCVBUFERRORS, is_udplite);
+ UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
+ kfree_skb(skb);
+ return -1;
+ }
+
+ return 0;
+}
+
+static __inline__ void udpv6_err(struct sk_buff *skb,
+ struct inet6_skb_parm *opt, u8 type,
+ u8 code, int offset, __be32 info)
+{
+ __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
+}
+
+static DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
+void udpv6_encap_enable(void)
+{
+ static_branch_enable(&udpv6_encap_needed_key);
+}
+EXPORT_SYMBOL(udpv6_encap_enable);
+
+static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+ struct udp_sock *up = udp_sk(sk);
+ int is_udplite = IS_UDPLITE(sk);
+
+ if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
+ goto drop;
+
+ if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
+ int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
+
+ /*
+ * This is an encapsulation socket so pass the skb to
+ * the socket's udp_encap_rcv() hook. Otherwise, just
+ * fall through and pass this up the UDP socket.
+ * up->encap_rcv() returns the following value:
+ * =0 if skb was successfully passed to the encap
+ * handler or was discarded by it.
+ * >0 if skb should be passed on to UDP.
+ * <0 if skb should be resubmitted as proto -N
+ */
+
+ /* if we're overly short, let UDP handle it */
+ encap_rcv = READ_ONCE(up->encap_rcv);
+ if (encap_rcv) {
+ int ret;
+
+ /* Verify checksum before giving to encap */
+ if (udp_lib_checksum_complete(skb))
+ goto csum_error;
+
+ ret = encap_rcv(sk, skb);
+ if (ret <= 0) {
+ __UDP_INC_STATS(sock_net(sk),
+ UDP_MIB_INDATAGRAMS,
+ is_udplite);
+ return -ret;
+ }
+ }
+
+ /* FALLTHROUGH -- it's a UDP Packet */
+ }
+
+ /*
+ * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
+ */
+ if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
+
+ if (up->pcrlen == 0) { /* full coverage was set */
+ net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
+ UDP_SKB_CB(skb)->cscov, skb->len);
+ goto drop;
+ }
+ if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
+ net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
+ UDP_SKB_CB(skb)->cscov, up->pcrlen);
+ goto drop;
+ }
+ }
+
+ prefetch(&sk->sk_rmem_alloc);
+ if (rcu_access_pointer(sk->sk_filter) &&
+ udp_lib_checksum_complete(skb))
+ goto csum_error;
+
+ if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
+ goto drop;
+
+ udp_csum_pull_header(skb);
+
+ skb_dst_drop(skb);
+
+ return __udpv6_queue_rcv_skb(sk, skb);
+
+csum_error:
+ __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
+drop:
+ __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
+ atomic_inc(&sk->sk_drops);
+ kfree_skb(skb);
+ return -1;
+}
+
+static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
+ __be16 loc_port, const struct in6_addr *loc_addr,
+ __be16 rmt_port, const struct in6_addr *rmt_addr,
+ int dif, unsigned short hnum)
+{
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (!net_eq(sock_net(sk), net))
+ return false;
+
+ if (udp_sk(sk)->udp_port_hash != hnum ||
+ sk->sk_family != PF_INET6 ||
+ (inet->inet_dport && inet->inet_dport != rmt_port) ||
+ (!ipv6_addr_any(&sk->sk_v6_daddr) &&
+ !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
+ (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
+ (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
+ !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
+ return false;
+ if (!inet6_mc_check(sk, loc_addr, rmt_addr))
+ return false;
+ return true;
+}
+
+static void udp6_csum_zero_error(struct sk_buff *skb)
+{
+ /* RFC 2460 section 8.1 says that we SHOULD log
+ * this error. Well, it is reasonable.
+ */
+ net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
+ &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
+ &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
+}
+
+/*
+ * Note: called only from the BH handler context,
+ * so we don't need to lock the hashes.
+ */
+static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
+ const struct in6_addr *saddr, const struct in6_addr *daddr,
+ struct udp_table *udptable, int proto)
+{
+ struct sock *sk, *first = NULL;
+ const struct udphdr *uh = udp_hdr(skb);
+ unsigned short hnum = ntohs(uh->dest);
+ struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
+ unsigned int offset = offsetof(typeof(*sk), sk_node);
+ unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
+ int dif = inet6_iif(skb);
+ struct hlist_node *node;
+ struct sk_buff *nskb;
+
+ if (use_hash2) {
+ hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
+ udptable->mask;
+ hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
+start_lookup:
+ hslot = &udptable->hash2[hash2];
+ offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
+ }
+
+ sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
+ if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
+ uh->source, saddr, dif, hnum))
+ continue;
+ /* If zero checksum and no_check is not on for
+ * the socket then skip it.
+ */
+ if (!uh->check && !udp_sk(sk)->no_check6_rx)
+ continue;
+ if (!first) {
+ first = sk;
+ continue;
+ }
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (unlikely(!nskb)) {
+ atomic_inc(&sk->sk_drops);
+ __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
+ IS_UDPLITE(sk));
+ __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
+ IS_UDPLITE(sk));
+ continue;
+ }
+
+ if (udpv6_queue_rcv_skb(sk, nskb) > 0)
+ consume_skb(nskb);
+ }
+
+ /* Also lookup *:port if we are using hash2 and haven't done so yet. */
+ if (use_hash2 && hash2 != hash2_any) {
+ hash2 = hash2_any;
+ goto start_lookup;
+ }
+
+ if (first) {
+ if (udpv6_queue_rcv_skb(first, skb) > 0)
+ consume_skb(skb);
+ } else {
+ kfree_skb(skb);
+ __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
+ proto == IPPROTO_UDPLITE);
+ }
+ return 0;
+}
+
+static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
+{
+ if (udp_sk_rx_dst_set(sk, dst)) {
+ const struct rt6_info *rt = (const struct rt6_info *)dst;
+
+ inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
+ }
+}
+
+/* wrapper for udp_queue_rcv_skb tacking care of csum conversion and
+ * return code conversion for ip layer consumption
+ */
+static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
+ struct udphdr *uh)
+{
+ int ret;
+
+ if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
+ skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
+ ip6_compute_pseudo);
+
+ ret = udpv6_queue_rcv_skb(sk, skb);
+
+ /* a return value > 0 means to resubmit the input */
+ if (ret > 0)
+ return ret;
+ return 0;
+}
+
+int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
+ int proto)
+{
+ const struct in6_addr *saddr, *daddr;
+ struct net *net = dev_net(skb->dev);
+ struct udphdr *uh;
+ struct sock *sk;
+ u32 ulen = 0;
+
+ if (!pskb_may_pull(skb, sizeof(struct udphdr)))
+ goto discard;
+
+ saddr = &ipv6_hdr(skb)->saddr;
+ daddr = &ipv6_hdr(skb)->daddr;
+ uh = udp_hdr(skb);
+
+ ulen = ntohs(uh->len);
+ if (ulen > skb->len)
+ goto short_packet;
+
+ if (proto == IPPROTO_UDP) {
+ /* UDP validates ulen. */
+
+ /* Check for jumbo payload */
+ if (ulen == 0)
+ ulen = skb->len;
+
+ if (ulen < sizeof(*uh))
+ goto short_packet;
+
+ if (ulen < skb->len) {
+ if (pskb_trim_rcsum(skb, ulen))
+ goto short_packet;
+ saddr = &ipv6_hdr(skb)->saddr;
+ daddr = &ipv6_hdr(skb)->daddr;
+ uh = udp_hdr(skb);
+ }
+ }
+
+ if (udp6_csum_init(skb, uh, proto))
+ goto csum_error;
+
+ /* Check if the socket is already available, e.g. due to early demux */
+ sk = skb_steal_sock(skb);
+ if (sk) {
+ struct dst_entry *dst = skb_dst(skb);
+ int ret;
+
+ if (unlikely(sk->sk_rx_dst != dst))
+ udp6_sk_rx_dst_set(sk, dst);
+
+ if (!uh->check && !udp_sk(sk)->no_check6_rx) {
+ sock_put(sk);
+ goto report_csum_error;
+ }
+
+ ret = udp6_unicast_rcv_skb(sk, skb, uh);
+ sock_put(sk);
+ return ret;
+ }
+
+ /*
+ * Multicast receive code
+ */
+ if (ipv6_addr_is_multicast(daddr))
+ return __udp6_lib_mcast_deliver(net, skb,
+ saddr, daddr, udptable, proto);
+
+ /* Unicast */
+ sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
+ if (sk) {
+ if (!uh->check && !udp_sk(sk)->no_check6_rx)
+ goto report_csum_error;
+ return udp6_unicast_rcv_skb(sk, skb, uh);
+ }
+
+ if (!uh->check)
+ goto report_csum_error;
+
+ if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
+ goto discard;
+
+ if (udp_lib_checksum_complete(skb))
+ goto csum_error;
+
+ __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
+
+ kfree_skb(skb);
+ return 0;
+
+short_packet:
+ net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
+ proto == IPPROTO_UDPLITE ? "-Lite" : "",
+ saddr, ntohs(uh->source),
+ ulen, skb->len,
+ daddr, ntohs(uh->dest));
+ goto discard;
+
+report_csum_error:
+ udp6_csum_zero_error(skb);
+csum_error:
+ __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
+discard:
+ __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
+ kfree_skb(skb);
+ return 0;
+}
+
+
+static struct sock *__udp6_lib_demux_lookup(struct net *net,
+ __be16 loc_port, const struct in6_addr *loc_addr,
+ __be16 rmt_port, const struct in6_addr *rmt_addr,
+ int dif, int sdif)
+{
+ unsigned short hnum = ntohs(loc_port);
+ unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
+ unsigned int slot2 = hash2 & udp_table.mask;
+ struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
+ const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
+ struct sock *sk;
+
+ udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
+ if (sk->sk_state == TCP_ESTABLISHED &&
+ INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif))
+ return sk;
+ /* Only check first socket in chain */
+ break;
+ }
+ return NULL;
+}
+
+static void udp_v6_early_demux(struct sk_buff *skb)
+{
+ struct net *net = dev_net(skb->dev);
+ const struct udphdr *uh;
+ struct sock *sk;
+ struct dst_entry *dst;
+ int dif = skb->dev->ifindex;
+ int sdif = inet6_sdif(skb);
+
+ if (!pskb_may_pull(skb, skb_transport_offset(skb) +
+ sizeof(struct udphdr)))
+ return;
+
+ uh = udp_hdr(skb);
+
+ if (skb->pkt_type == PACKET_HOST)
+ sk = __udp6_lib_demux_lookup(net, uh->dest,
+ &ipv6_hdr(skb)->daddr,
+ uh->source, &ipv6_hdr(skb)->saddr,
+ dif, sdif);
+ else
+ return;
+
+ if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
+ return;
+
+ skb->sk = sk;
+ skb->destructor = sock_efree;
+ dst = READ_ONCE(sk->sk_rx_dst);
+
+ if (dst)
+ dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
+ if (dst) {
+ /* set noref for now.
+ * any place which wants to hold dst has to call
+ * dst_hold_safe()
+ */
+ skb_dst_set_noref(skb, dst);
+ }
+}
+
+static __inline__ int udpv6_rcv(struct sk_buff *skb)
+{
+ return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
+}
+
+/*
+ * Throw away all pending data and cancel the corking. Socket is locked.
+ */
+static void udp_v6_flush_pending_frames(struct sock *sk)
+{
+ struct udp_sock *up = udp_sk(sk);
+
+ if (up->pending == AF_INET)
+ udp_flush_pending_frames(sk);
+ else if (up->pending) {
+ up->len = 0;
+ up->pending = 0;
+ ip6_flush_pending_frames(sk);
+ }
+}
+
+static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
+ int addr_len)
+{
+ /* The following checks are replicated from __ip6_datagram_connect()
+ * and intended to prevent BPF program called below from accessing
+ * bytes that are out of the bound specified by user in addr_len.
+ */
+ if (uaddr->sa_family == AF_INET) {
+ if (__ipv6_only_sock(sk))
+ return -EAFNOSUPPORT;
+ return udp_pre_connect(sk, uaddr, addr_len);
+ }
+
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+
+ return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr);
+}
+
+/**
+ * udp6_hwcsum_outgoing - handle outgoing HW checksumming
+ * @sk: socket we are sending on
+ * @skb: sk_buff containing the filled-in UDP header
+ * (checksum field must be zeroed out)
+ */
+static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr, int len)
+{
+ unsigned int offset;
+ struct udphdr *uh = udp_hdr(skb);
+ struct sk_buff *frags = skb_shinfo(skb)->frag_list;
+ __wsum csum = 0;
+
+ if (!frags) {
+ /* Only one fragment on the socket. */
+ skb->csum_start = skb_transport_header(skb) - skb->head;
+ skb->csum_offset = offsetof(struct udphdr, check);
+ uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
+ } else {
+ /*
+ * HW-checksum won't work as there are two or more
+ * fragments on the socket so that all csums of sk_buffs
+ * should be together
+ */
+ offset = skb_transport_offset(skb);
+ skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
+ csum = skb->csum;
+
+ skb->ip_summed = CHECKSUM_NONE;
+
+ do {
+ csum = csum_add(csum, frags->csum);
+ } while ((frags = frags->next));
+
+ uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
+ csum);
+ if (uh->check == 0)
+ uh->check = CSUM_MANGLED_0;
+ }
+}
+
+/*
+ * Sending
+ */
+
+static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
+ struct inet_cork *cork)
+{
+ struct sock *sk = skb->sk;
+ struct udphdr *uh;
+ int err = 0;
+ int is_udplite = IS_UDPLITE(sk);
+ __wsum csum = 0;
+ int offset = skb_transport_offset(skb);
+ int len = skb->len - offset;
+
+ /*
+ * Create a UDP header
+ */
+ uh = udp_hdr(skb);
+ uh->source = fl6->fl6_sport;
+ uh->dest = fl6->fl6_dport;
+ uh->len = htons(len);
+ uh->check = 0;
+
+ if (cork->gso_size) {
+ const int hlen = skb_network_header_len(skb) +
+ sizeof(struct udphdr);
+
+ if (hlen + cork->gso_size > cork->fragsize)
+ return -EINVAL;
+ if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS)
+ return -EINVAL;
+ if (udp_sk(sk)->no_check6_tx)
+ return -EINVAL;
+ if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
+ dst_xfrm(skb_dst(skb)))
+ return -EIO;
+
+ skb_shinfo(skb)->gso_size = cork->gso_size;
+ skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
+ goto csum_partial;
+ }
+
+ if (is_udplite)
+ csum = udplite_csum(skb);
+ else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
+ skb->ip_summed = CHECKSUM_NONE;
+ goto send;
+ } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
+csum_partial:
+ udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
+ goto send;
+ } else
+ csum = udp_csum(skb);
+
+ /* add protocol-dependent pseudo-header */
+ uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
+ len, fl6->flowi6_proto, csum);
+ if (uh->check == 0)
+ uh->check = CSUM_MANGLED_0;
+
+send:
+ err = ip6_send_skb(skb);
+ if (err) {
+ if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
+ UDP6_INC_STATS(sock_net(sk),
+ UDP_MIB_SNDBUFERRORS, is_udplite);
+ err = 0;
+ }
+ } else {
+ UDP6_INC_STATS(sock_net(sk),
+ UDP_MIB_OUTDATAGRAMS, is_udplite);
+ }
+ return err;
+}
+
+static int udp_v6_push_pending_frames(struct sock *sk)
+{
+ struct sk_buff *skb;
+ struct udp_sock *up = udp_sk(sk);
+ struct flowi6 fl6;
+ int err = 0;
+
+ if (up->pending == AF_INET)
+ return udp_push_pending_frames(sk);
+
+ /* ip6_finish_skb will release the cork, so make a copy of
+ * fl6 here.
+ */
+ fl6 = inet_sk(sk)->cork.fl.u.ip6;
+
+ skb = ip6_finish_skb(sk);
+ if (!skb)
+ goto out;
+
+ err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base);
+
+out:
+ up->len = 0;
+ up->pending = 0;
+ return err;
+}
+
+int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
+{
+ struct ipv6_txoptions opt_space;
+ struct udp_sock *up = udp_sk(sk);
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
+ struct in6_addr *daddr, *final_p, final;
+ struct ipv6_txoptions *opt = NULL;
+ struct ipv6_txoptions *opt_to_free = NULL;
+ struct ip6_flowlabel *flowlabel = NULL;
+ struct flowi6 fl6;
+ struct dst_entry *dst;
+ struct ipcm6_cookie ipc6;
+ int addr_len = msg->msg_namelen;
+ bool connected = false;
+ int ulen = len;
+ int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
+ int err;
+ int is_udplite = IS_UDPLITE(sk);
+ int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
+
+ ipcm6_init(&ipc6);
+ ipc6.gso_size = up->gso_size;
+ ipc6.sockc.tsflags = sk->sk_tsflags;
+
+ /* destination address check */
+ if (sin6) {
+ if (addr_len < offsetof(struct sockaddr, sa_data))
+ return -EINVAL;
+
+ switch (sin6->sin6_family) {
+ case AF_INET6:
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+ daddr = &sin6->sin6_addr;
+ if (ipv6_addr_any(daddr) &&
+ ipv6_addr_v4mapped(&np->saddr))
+ ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
+ daddr);
+ break;
+ case AF_INET:
+ goto do_udp_sendmsg;
+ case AF_UNSPEC:
+ msg->msg_name = sin6 = NULL;
+ msg->msg_namelen = addr_len = 0;
+ daddr = NULL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ } else if (!up->pending) {
+ if (sk->sk_state != TCP_ESTABLISHED)
+ return -EDESTADDRREQ;
+ daddr = &sk->sk_v6_daddr;
+ } else
+ daddr = NULL;
+
+ if (daddr) {
+ if (ipv6_addr_v4mapped(daddr)) {
+ struct sockaddr_in sin;
+ sin.sin_family = AF_INET;
+ sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
+ sin.sin_addr.s_addr = daddr->s6_addr32[3];
+ msg->msg_name = &sin;
+ msg->msg_namelen = sizeof(sin);
+do_udp_sendmsg:
+ if (__ipv6_only_sock(sk))
+ return -ENETUNREACH;
+ return udp_sendmsg(sk, msg, len);
+ }
+ }
+
+ if (up->pending == AF_INET)
+ return udp_sendmsg(sk, msg, len);
+
+ /* Rough check on arithmetic overflow,
+ better check is made in ip6_append_data().
+ */
+ if (len > INT_MAX - sizeof(struct udphdr))
+ return -EMSGSIZE;
+
+ getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
+ if (up->pending) {
+ /*
+ * There are pending frames.
+ * The socket lock must be held while it's corked.
+ */
+ lock_sock(sk);
+ if (likely(up->pending)) {
+ if (unlikely(up->pending != AF_INET6)) {
+ release_sock(sk);
+ return -EAFNOSUPPORT;
+ }
+ dst = NULL;
+ goto do_append_data;
+ }
+ release_sock(sk);
+ }
+ ulen += sizeof(struct udphdr);
+
+ memset(&fl6, 0, sizeof(fl6));
+
+ if (sin6) {
+ if (sin6->sin6_port == 0)
+ return -EINVAL;
+
+ fl6.fl6_dport = sin6->sin6_port;
+ daddr = &sin6->sin6_addr;
+
+ if (np->sndflow) {
+ fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
+ if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
+ flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
+ if (!flowlabel)
+ return -EINVAL;
+ }
+ }
+
+ /*
+ * Otherwise it will be difficult to maintain
+ * sk->sk_dst_cache.
+ */
+ if (sk->sk_state == TCP_ESTABLISHED &&
+ ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
+ daddr = &sk->sk_v6_daddr;
+
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ sin6->sin6_scope_id &&
+ __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
+ fl6.flowi6_oif = sin6->sin6_scope_id;
+ } else {
+ if (sk->sk_state != TCP_ESTABLISHED)
+ return -EDESTADDRREQ;
+
+ fl6.fl6_dport = inet->inet_dport;
+ daddr = &sk->sk_v6_daddr;
+ fl6.flowlabel = np->flow_label;
+ connected = true;
+ }
+
+ if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = sk->sk_bound_dev_if;
+
+ if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
+
+ fl6.flowi6_mark = sk->sk_mark;
+ fl6.flowi6_uid = sk->sk_uid;
+
+ if (msg->msg_controllen) {
+ opt = &opt_space;
+ memset(opt, 0, sizeof(struct ipv6_txoptions));
+ opt->tot_len = sizeof(*opt);
+ ipc6.opt = opt;
+
+ err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
+ if (err > 0)
+ err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6,
+ &ipc6);
+ if (err < 0) {
+ fl6_sock_release(flowlabel);
+ return err;
+ }
+ if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
+ flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
+ if (!flowlabel)
+ return -EINVAL;
+ }
+ if (!(opt->opt_nflen|opt->opt_flen))
+ opt = NULL;
+ connected = false;
+ }
+ if (!opt) {
+ opt = txopt_get(np);
+ opt_to_free = opt;
+ }
+ if (flowlabel)
+ opt = fl6_merge_options(&opt_space, flowlabel, opt);
+ opt = ipv6_fixup_options(&opt_space, opt);
+ ipc6.opt = opt;
+
+ fl6.flowi6_proto = sk->sk_protocol;
+ if (!ipv6_addr_any(daddr))
+ fl6.daddr = *daddr;
+ else
+ fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
+ if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
+ fl6.saddr = np->saddr;
+ fl6.fl6_sport = inet->inet_sport;
+
+ if (cgroup_bpf_enabled && !connected) {
+ err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk,
+ (struct sockaddr *)sin6, &fl6.saddr);
+ if (err)
+ goto out_no_dst;
+ if (sin6) {
+ if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
+ /* BPF program rewrote IPv6-only by IPv4-mapped
+ * IPv6. It's currently unsupported.
+ */
+ err = -ENOTSUPP;
+ goto out_no_dst;
+ }
+ if (sin6->sin6_port == 0) {
+ /* BPF program set invalid port. Reject it. */
+ err = -EINVAL;
+ goto out_no_dst;
+ }
+ fl6.fl6_dport = sin6->sin6_port;
+ fl6.daddr = sin6->sin6_addr;
+ }
+ }
+
+ final_p = fl6_update_dst(&fl6, opt, &final);
+ if (final_p)
+ connected = false;
+
+ if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
+ fl6.flowi6_oif = np->mcast_oif;
+ connected = false;
+ } else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
+
+ security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
+
+ if (ipc6.tclass < 0)
+ ipc6.tclass = np->tclass;
+
+ fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
+
+ dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ dst = NULL;
+ goto out;
+ }
+
+ if (ipc6.hlimit < 0)
+ ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
+
+ if (msg->msg_flags&MSG_CONFIRM)
+ goto do_confirm;
+back_from_confirm:
+
+ /* Lockless fast path for the non-corking case */
+ if (!corkreq) {
+ struct inet_cork_full cork;
+ struct sk_buff *skb;
+
+ skb = ip6_make_skb(sk, getfrag, msg, ulen,
+ sizeof(struct udphdr), &ipc6,
+ &fl6, (struct rt6_info *)dst,
+ msg->msg_flags, &cork);
+ err = PTR_ERR(skb);
+ if (!IS_ERR_OR_NULL(skb))
+ err = udp_v6_send_skb(skb, &fl6, &cork.base);
+ goto out;
+ }
+
+ lock_sock(sk);
+ if (unlikely(up->pending)) {
+ /* The socket is already corked while preparing it. */
+ /* ... which is an evident application bug. --ANK */
+ release_sock(sk);
+
+ net_dbg_ratelimited("udp cork app bug 2\n");
+ err = -EINVAL;
+ goto out;
+ }
+
+ up->pending = AF_INET6;
+
+do_append_data:
+ if (ipc6.dontfrag < 0)
+ ipc6.dontfrag = np->dontfrag;
+ up->len += ulen;
+ err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
+ &ipc6, &fl6, (struct rt6_info *)dst,
+ corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
+ if (err)
+ udp_v6_flush_pending_frames(sk);
+ else if (!corkreq)
+ err = udp_v6_push_pending_frames(sk);
+ else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
+ up->pending = 0;
+
+ if (err > 0)
+ err = np->recverr ? net_xmit_errno(err) : 0;
+ release_sock(sk);
+
+out:
+ dst_release(dst);
+out_no_dst:
+ fl6_sock_release(flowlabel);
+ txopt_put(opt_to_free);
+ if (!err)
+ return len;
+ /*
+ * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
+ * ENOBUFS might not be good (it's not tunable per se), but otherwise
+ * we don't have a good statistic (IpOutDiscards but it can be too many
+ * things). We could add another new stat but at least for now that
+ * seems like overkill.
+ */
+ if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
+ UDP6_INC_STATS(sock_net(sk),
+ UDP_MIB_SNDBUFERRORS, is_udplite);
+ }
+ return err;
+
+do_confirm:
+ if (msg->msg_flags & MSG_PROBE)
+ dst_confirm_neigh(dst, &fl6.daddr);
+ if (!(msg->msg_flags&MSG_PROBE) || len)
+ goto back_from_confirm;
+ err = 0;
+ goto out;
+}
+
+void udpv6_destroy_sock(struct sock *sk)
+{
+ struct udp_sock *up = udp_sk(sk);
+ lock_sock(sk);
+ udp_v6_flush_pending_frames(sk);
+ release_sock(sk);
+
+ if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
+ void (*encap_destroy)(struct sock *sk);
+ encap_destroy = READ_ONCE(up->encap_destroy);
+ if (encap_destroy)
+ encap_destroy(sk);
+ }
+
+ inet6_destroy_sock(sk);
+}
+
+/*
+ * Socket option code for UDP
+ */
+int udpv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ if (level == SOL_UDP || level == SOL_UDPLITE)
+ return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+ udp_v6_push_pending_frames);
+ return ipv6_setsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ if (level == SOL_UDP || level == SOL_UDPLITE)
+ return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+ udp_v6_push_pending_frames);
+ return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
+}
+#endif
+
+int udpv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ if (level == SOL_UDP || level == SOL_UDPLITE)
+ return udp_lib_getsockopt(sk, level, optname, optval, optlen);
+ return ipv6_getsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ if (level == SOL_UDP || level == SOL_UDPLITE)
+ return udp_lib_getsockopt(sk, level, optname, optval, optlen);
+ return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
+}
+#endif
+
+/* thinking of making this const? Don't.
+ * early_demux can change based on sysctl.
+ */
+static struct inet6_protocol udpv6_protocol = {
+ .early_demux = udp_v6_early_demux,
+ .early_demux_handler = udp_v6_early_demux,
+ .handler = udpv6_rcv,
+ .err_handler = udpv6_err,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+/* ------------------------------------------------------------------------ */
+#ifdef CONFIG_PROC_FS
+int udp6_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
+ } else {
+ int bucket = ((struct udp_iter_state *)seq->private)->bucket;
+ struct inet_sock *inet = inet_sk(v);
+ __u16 srcp = ntohs(inet->inet_sport);
+ __u16 destp = ntohs(inet->inet_dport);
+ __ip6_dgram_sock_seq_show(seq, v, srcp, destp,
+ udp_rqueue_get(v), bucket);
+ }
+ return 0;
+}
+
+const struct seq_operations udp6_seq_ops = {
+ .start = udp_seq_start,
+ .next = udp_seq_next,
+ .stop = udp_seq_stop,
+ .show = udp6_seq_show,
+};
+EXPORT_SYMBOL(udp6_seq_ops);
+
+static struct udp_seq_afinfo udp6_seq_afinfo = {
+ .family = AF_INET6,
+ .udp_table = &udp_table,
+};
+
+int __net_init udp6_proc_init(struct net *net)
+{
+ if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops,
+ sizeof(struct udp_iter_state), &udp6_seq_afinfo))
+ return -ENOMEM;
+ return 0;
+}
+
+void udp6_proc_exit(struct net *net)
+{
+ remove_proc_entry("udp6", net->proc_net);
+}
+#endif /* CONFIG_PROC_FS */
+
+/* ------------------------------------------------------------------------ */
+
+struct proto udpv6_prot = {
+ .name = "UDPv6",
+ .owner = THIS_MODULE,
+ .close = udp_lib_close,
+ .pre_connect = udpv6_pre_connect,
+ .connect = ip6_datagram_connect,
+ .disconnect = udp_disconnect,
+ .ioctl = udp_ioctl,
+ .init = udp_init_sock,
+ .destroy = udpv6_destroy_sock,
+ .setsockopt = udpv6_setsockopt,
+ .getsockopt = udpv6_getsockopt,
+ .sendmsg = udpv6_sendmsg,
+ .recvmsg = udpv6_recvmsg,
+ .release_cb = ip6_datagram_release_cb,
+ .hash = udp_lib_hash,
+ .unhash = udp_lib_unhash,
+ .rehash = udp_v6_rehash,
+ .get_port = udp_v6_get_port,
+ .memory_allocated = &udp_memory_allocated,
+ .sysctl_mem = sysctl_udp_mem,
+ .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
+ .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
+ .obj_size = sizeof(struct udp6_sock),
+ .h.udp_table = &udp_table,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_udpv6_setsockopt,
+ .compat_getsockopt = compat_udpv6_getsockopt,
+#endif
+ .diag_destroy = udp_abort,
+};
+
+static struct inet_protosw udpv6_protosw = {
+ .type = SOCK_DGRAM,
+ .protocol = IPPROTO_UDP,
+ .prot = &udpv6_prot,
+ .ops = &inet6_dgram_ops,
+ .flags = INET_PROTOSW_PERMANENT,
+};
+
+int __init udpv6_init(void)
+{
+ int ret;
+
+ ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
+ if (ret)
+ goto out;
+
+ ret = inet6_register_protosw(&udpv6_protosw);
+ if (ret)
+ goto out_udpv6_protocol;
+out:
+ return ret;
+
+out_udpv6_protocol:
+ inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
+ goto out;
+}
+
+void udpv6_exit(void)
+{
+ inet6_unregister_protosw(&udpv6_protosw);
+ inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
+}
diff --git a/net/ipv6/udp_impl.h b/net/ipv6/udp_impl.h
new file mode 100644
index 0000000..7903e21
--- /dev/null
+++ b/net/ipv6/udp_impl.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _UDP6_IMPL_H
+#define _UDP6_IMPL_H
+#include <net/udp.h>
+#include <net/udplite.h>
+#include <net/protocol.h>
+#include <net/addrconf.h>
+#include <net/inet_common.h>
+#include <net/transp_v6.h>
+
+int __udp6_lib_rcv(struct sk_buff *, struct udp_table *, int);
+void __udp6_lib_err(struct sk_buff *, struct inet6_skb_parm *, u8, u8, int,
+ __be32, struct udp_table *);
+
+int udp_v6_get_port(struct sock *sk, unsigned short snum);
+
+int udpv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen);
+int udpv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen);
+#ifdef CONFIG_COMPAT
+int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen);
+int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen);
+#endif
+int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
+int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
+ int flags, int *addr_len);
+void udpv6_destroy_sock(struct sock *sk);
+
+#ifdef CONFIG_PROC_FS
+int udp6_seq_show(struct seq_file *seq, void *v);
+#endif
+#endif /* _UDP6_IMPL_H */
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
new file mode 100644
index 0000000..95dee9c
--- /dev/null
+++ b/net/ipv6/udp_offload.c
@@ -0,0 +1,177 @@
+/*
+ * IPV6 GSO/GRO offload support
+ * Linux INET6 implementation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * UDPv6 GSO support
+ */
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <net/protocol.h>
+#include <net/ipv6.h>
+#include <net/udp.h>
+#include <net/ip6_checksum.h>
+#include "ip6_offload.h"
+
+static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
+ netdev_features_t features)
+{
+ struct sk_buff *segs = ERR_PTR(-EINVAL);
+ unsigned int mss;
+ unsigned int unfrag_ip6hlen, unfrag_len;
+ struct frag_hdr *fptr;
+ u8 *packet_start, *prevhdr;
+ u8 nexthdr;
+ u8 frag_hdr_sz = sizeof(struct frag_hdr);
+ __wsum csum;
+ int tnl_hlen;
+ int err;
+
+ mss = skb_shinfo(skb)->gso_size;
+ if (unlikely(skb->len <= mss))
+ goto out;
+
+ if (skb->encapsulation && skb_shinfo(skb)->gso_type &
+ (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))
+ segs = skb_udp_tunnel_segment(skb, features, true);
+ else {
+ const struct ipv6hdr *ipv6h;
+ struct udphdr *uh;
+
+ if (!(skb_shinfo(skb)->gso_type & (SKB_GSO_UDP | SKB_GSO_UDP_L4)))
+ goto out;
+
+ if (!pskb_may_pull(skb, sizeof(struct udphdr)))
+ goto out;
+
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
+ return __udp_gso_segment(skb, features);
+
+ /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
+ * do checksum of UDP packets sent as multiple IP fragments.
+ */
+
+ uh = udp_hdr(skb);
+ ipv6h = ipv6_hdr(skb);
+
+ uh->check = 0;
+ csum = skb_checksum(skb, 0, skb->len, 0);
+ uh->check = udp_v6_check(skb->len, &ipv6h->saddr,
+ &ipv6h->daddr, csum);
+ if (uh->check == 0)
+ uh->check = CSUM_MANGLED_0;
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ /* If there is no outer header we can fake a checksum offload
+ * due to the fact that we have already done the checksum in
+ * software prior to segmenting the frame.
+ */
+ if (!skb->encap_hdr_csum)
+ features |= NETIF_F_HW_CSUM;
+
+ /* Check if there is enough headroom to insert fragment header. */
+ tnl_hlen = skb_tnl_header_len(skb);
+ if (skb->mac_header < (tnl_hlen + frag_hdr_sz)) {
+ if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz))
+ goto out;
+ }
+
+ /* Find the unfragmentable header and shift it left by frag_hdr_sz
+ * bytes to insert fragment header.
+ */
+ err = ip6_find_1stfragopt(skb, &prevhdr);
+ if (err < 0)
+ return ERR_PTR(err);
+ unfrag_ip6hlen = err;
+ nexthdr = *prevhdr;
+ *prevhdr = NEXTHDR_FRAGMENT;
+ unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) +
+ unfrag_ip6hlen + tnl_hlen;
+ packet_start = (u8 *) skb->head + SKB_GSO_CB(skb)->mac_offset;
+ memmove(packet_start-frag_hdr_sz, packet_start, unfrag_len);
+
+ SKB_GSO_CB(skb)->mac_offset -= frag_hdr_sz;
+ skb->mac_header -= frag_hdr_sz;
+ skb->network_header -= frag_hdr_sz;
+
+ fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
+ fptr->nexthdr = nexthdr;
+ fptr->reserved = 0;
+ fptr->identification = ipv6_proxy_select_ident(dev_net(skb->dev), skb);
+
+ /* Fragment the skb. ipv6 header and the remaining fields of the
+ * fragment header are updated in ipv6_gso_segment()
+ */
+ segs = skb_segment(skb, features);
+ }
+
+out:
+ return segs;
+}
+
+static struct sk_buff *udp6_gro_receive(struct list_head *head,
+ struct sk_buff *skb)
+{
+ struct udphdr *uh = udp_gro_udphdr(skb);
+
+ if (unlikely(!uh))
+ goto flush;
+
+ /* Don't bother verifying checksum if we're going to flush anyway. */
+ if (NAPI_GRO_CB(skb)->flush)
+ goto skip;
+
+ if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
+ ip6_gro_compute_pseudo))
+ goto flush;
+ else if (uh->check)
+ skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
+ ip6_gro_compute_pseudo);
+
+skip:
+ NAPI_GRO_CB(skb)->is_ipv6 = 1;
+ return udp_gro_receive(head, skb, uh, udp6_lib_lookup_skb);
+
+flush:
+ NAPI_GRO_CB(skb)->flush = 1;
+ return NULL;
+}
+
+static int udp6_gro_complete(struct sk_buff *skb, int nhoff)
+{
+ const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
+
+ if (uh->check) {
+ skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
+ uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr,
+ &ipv6h->daddr, 0);
+ } else {
+ skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
+ }
+
+ return udp_gro_complete(skb, nhoff, udp6_lib_lookup_skb);
+}
+
+static const struct net_offload udpv6_offload = {
+ .callbacks = {
+ .gso_segment = udp6_ufo_fragment,
+ .gro_receive = udp6_gro_receive,
+ .gro_complete = udp6_gro_complete,
+ },
+};
+
+int udpv6_offload_init(void)
+{
+ return inet6_add_offload(&udpv6_offload, IPPROTO_UDP);
+}
+
+int udpv6_offload_exit(void)
+{
+ return inet6_del_offload(&udpv6_offload, IPPROTO_UDP);
+}
diff --git a/net/ipv6/udplite.c b/net/ipv6/udplite.c
new file mode 100644
index 0000000..5000ad6
--- /dev/null
+++ b/net/ipv6/udplite.c
@@ -0,0 +1,129 @@
+/*
+ * UDPLITEv6 An implementation of the UDP-Lite protocol over IPv6.
+ * See also net/ipv4/udplite.c
+ *
+ * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk>
+ *
+ * Changes:
+ * Fixes:
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/export.h>
+#include <linux/proc_fs.h>
+#include "udp_impl.h"
+
+static int udplitev6_rcv(struct sk_buff *skb)
+{
+ return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
+}
+
+static void udplitev6_err(struct sk_buff *skb,
+ struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ __udp6_lib_err(skb, opt, type, code, offset, info, &udplite_table);
+}
+
+static const struct inet6_protocol udplitev6_protocol = {
+ .handler = udplitev6_rcv,
+ .err_handler = udplitev6_err,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+struct proto udplitev6_prot = {
+ .name = "UDPLITEv6",
+ .owner = THIS_MODULE,
+ .close = udp_lib_close,
+ .connect = ip6_datagram_connect,
+ .disconnect = udp_disconnect,
+ .ioctl = udp_ioctl,
+ .init = udplite_sk_init,
+ .destroy = udpv6_destroy_sock,
+ .setsockopt = udpv6_setsockopt,
+ .getsockopt = udpv6_getsockopt,
+ .sendmsg = udpv6_sendmsg,
+ .recvmsg = udpv6_recvmsg,
+ .hash = udp_lib_hash,
+ .unhash = udp_lib_unhash,
+ .get_port = udp_v6_get_port,
+ .memory_allocated = &udp_memory_allocated,
+ .sysctl_mem = sysctl_udp_mem,
+ .obj_size = sizeof(struct udp6_sock),
+ .h.udp_table = &udplite_table,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_udpv6_setsockopt,
+ .compat_getsockopt = compat_udpv6_getsockopt,
+#endif
+};
+
+static struct inet_protosw udplite6_protosw = {
+ .type = SOCK_DGRAM,
+ .protocol = IPPROTO_UDPLITE,
+ .prot = &udplitev6_prot,
+ .ops = &inet6_dgram_ops,
+ .flags = INET_PROTOSW_PERMANENT,
+};
+
+int __init udplitev6_init(void)
+{
+ int ret;
+
+ ret = inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
+ if (ret)
+ goto out;
+
+ ret = inet6_register_protosw(&udplite6_protosw);
+ if (ret)
+ goto out_udplitev6_protocol;
+out:
+ return ret;
+
+out_udplitev6_protocol:
+ inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
+ goto out;
+}
+
+void udplitev6_exit(void)
+{
+ inet6_unregister_protosw(&udplite6_protosw);
+ inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
+}
+
+#ifdef CONFIG_PROC_FS
+static struct udp_seq_afinfo udplite6_seq_afinfo = {
+ .family = AF_INET6,
+ .udp_table = &udplite_table,
+};
+
+static int __net_init udplite6_proc_init_net(struct net *net)
+{
+ if (!proc_create_net_data("udplite6", 0444, net->proc_net,
+ &udp6_seq_ops, sizeof(struct udp_iter_state),
+ &udplite6_seq_afinfo))
+ return -ENOMEM;
+ return 0;
+}
+
+static void __net_exit udplite6_proc_exit_net(struct net *net)
+{
+ remove_proc_entry("udplite6", net->proc_net);
+}
+
+static struct pernet_operations udplite6_net_ops = {
+ .init = udplite6_proc_init_net,
+ .exit = udplite6_proc_exit_net,
+};
+
+int __init udplite6_proc_init(void)
+{
+ return register_pernet_subsys(&udplite6_net_ops);
+}
+
+void udplite6_proc_exit(void)
+{
+ unregister_pernet_subsys(&udplite6_net_ops);
+}
+#endif
diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
new file mode 100644
index 0000000..9ef490d
--- /dev/null
+++ b/net/ipv6/xfrm6_input.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * xfrm6_input.c: based on net/ipv4/xfrm4_input.c
+ *
+ * Authors:
+ * Mitsuru KANDA @USAGI
+ * Kazunori MIYAZAWA @USAGI
+ * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ * YOSHIFUJI Hideaki @USAGI
+ * IPv6 support
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <net/ipv6.h>
+#include <net/xfrm.h>
+
+int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ return xfrm6_extract_header(skb);
+}
+
+int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
+ struct ip6_tnl *t)
+{
+ XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
+ XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
+ XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
+ return xfrm_input(skb, nexthdr, spi, 0);
+}
+EXPORT_SYMBOL(xfrm6_rcv_spi);
+
+static int xfrm6_transport_finish2(struct net *net, struct sock *sk,
+ struct sk_buff *skb)
+{
+ if (xfrm_trans_queue(skb, ip6_rcv_finish))
+ __kfree_skb(skb);
+ return -1;
+}
+
+int xfrm6_transport_finish(struct sk_buff *skb, int async)
+{
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ int nhlen = skb->data - skb_network_header(skb);
+
+ skb_network_header(skb)[IP6CB(skb)->nhoff] =
+ XFRM_MODE_SKB_CB(skb)->protocol;
+
+#ifndef CONFIG_NETFILTER
+ if (!async)
+ return 1;
+#endif
+
+ __skb_push(skb, nhlen);
+ ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
+ skb_postpush_rcsum(skb, skb_network_header(skb), nhlen);
+
+ if (xo && (xo->flags & XFRM_GRO)) {
+ skb_mac_header_rebuild(skb);
+ skb_reset_transport_header(skb);
+ return -1;
+ }
+
+ NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
+ dev_net(skb->dev), NULL, skb, skb->dev, NULL,
+ xfrm6_transport_finish2);
+ return -1;
+}
+
+int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t)
+{
+ return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
+ 0, t);
+}
+EXPORT_SYMBOL(xfrm6_rcv_tnl);
+
+int xfrm6_rcv(struct sk_buff *skb)
+{
+ return xfrm6_rcv_tnl(skb, NULL);
+}
+EXPORT_SYMBOL(xfrm6_rcv);
+int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
+ xfrm_address_t *saddr, u8 proto)
+{
+ struct net *net = dev_net(skb->dev);
+ struct xfrm_state *x = NULL;
+ int i = 0;
+
+ if (secpath_set(skb)) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
+ goto drop;
+ }
+
+ if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
+ goto drop;
+ }
+
+ for (i = 0; i < 3; i++) {
+ xfrm_address_t *dst, *src;
+
+ switch (i) {
+ case 0:
+ dst = daddr;
+ src = saddr;
+ break;
+ case 1:
+ /* lookup state with wild-card source address */
+ dst = daddr;
+ src = (xfrm_address_t *)&in6addr_any;
+ break;
+ default:
+ /* lookup state with wild-card addresses */
+ dst = (xfrm_address_t *)&in6addr_any;
+ src = (xfrm_address_t *)&in6addr_any;
+ break;
+ }
+
+ x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
+ if (!x)
+ continue;
+
+ spin_lock(&x->lock);
+
+ if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
+ likely(x->km.state == XFRM_STATE_VALID) &&
+ !xfrm_state_check_expire(x)) {
+ spin_unlock(&x->lock);
+ if (x->type->input(x, skb) > 0) {
+ /* found a valid state */
+ break;
+ }
+ } else
+ spin_unlock(&x->lock);
+
+ xfrm_state_put(x);
+ x = NULL;
+ }
+
+ if (!x) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
+ xfrm_audit_state_notfound_simple(skb, AF_INET6);
+ goto drop;
+ }
+
+ skb->sp->xvec[skb->sp->len++] = x;
+
+ spin_lock(&x->lock);
+
+ x->curlft.bytes += skb->len;
+ x->curlft.packets++;
+
+ spin_unlock(&x->lock);
+
+ return 1;
+
+drop:
+ return -1;
+}
+EXPORT_SYMBOL(xfrm6_input_addr);
diff --git a/net/ipv6/xfrm6_mode_beet.c b/net/ipv6/xfrm6_mode_beet.c
new file mode 100644
index 0000000..57fd314
--- /dev/null
+++ b/net/ipv6/xfrm6_mode_beet.c
@@ -0,0 +1,131 @@
+/*
+ * xfrm6_mode_beet.c - BEET mode encapsulation for IPv6.
+ *
+ * Copyright (c) 2006 Diego Beltrami <diego.beltrami@gmail.com>
+ * Miika Komu <miika@iki.fi>
+ * Herbert Xu <herbert@gondor.apana.org.au>
+ * Abhinav Pathak <abhinav.pathak@hiit.fi>
+ * Jeff Ahrenholz <ahrenholz@gmail.com>
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/stringify.h>
+#include <net/dsfield.h>
+#include <net/dst.h>
+#include <net/inet_ecn.h>
+#include <net/ipv6.h>
+#include <net/xfrm.h>
+
+static void xfrm6_beet_make_header(struct sk_buff *skb)
+{
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+
+ iph->version = 6;
+
+ memcpy(iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
+ sizeof(iph->flow_lbl));
+ iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol;
+
+ ipv6_change_dsfield(iph, 0, XFRM_MODE_SKB_CB(skb)->tos);
+ iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl;
+}
+
+/* Add encapsulation header.
+ *
+ * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
+ */
+static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ipv6hdr *top_iph;
+ struct ip_beet_phdr *ph;
+ int optlen, hdr_len;
+
+ hdr_len = 0;
+ optlen = XFRM_MODE_SKB_CB(skb)->optlen;
+ if (unlikely(optlen))
+ hdr_len += IPV4_BEET_PHMAXLEN - (optlen & 4);
+
+ skb_set_network_header(skb, -x->props.header_len - hdr_len);
+ if (x->sel.family != AF_INET6)
+ skb->network_header += IPV4_BEET_PHMAXLEN;
+ skb->mac_header = skb->network_header +
+ offsetof(struct ipv6hdr, nexthdr);
+ skb->transport_header = skb->network_header + sizeof(*top_iph);
+ ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdr_len);
+
+ xfrm6_beet_make_header(skb);
+
+ top_iph = ipv6_hdr(skb);
+ if (unlikely(optlen)) {
+
+ BUG_ON(optlen < 0);
+
+ ph->padlen = 4 - (optlen & 4);
+ ph->hdrlen = optlen / 8;
+ ph->nexthdr = top_iph->nexthdr;
+ if (ph->padlen)
+ memset(ph + 1, IPOPT_NOP, ph->padlen);
+
+ top_iph->nexthdr = IPPROTO_BEETPH;
+ }
+
+ top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
+ top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
+ return 0;
+}
+
+static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ipv6hdr *ip6h;
+ int size = sizeof(struct ipv6hdr);
+ int err;
+
+ err = skb_cow_head(skb, size + skb->mac_len);
+ if (err)
+ goto out;
+
+ __skb_push(skb, size);
+ skb_reset_network_header(skb);
+ skb_mac_header_rebuild(skb);
+
+ xfrm6_beet_make_header(skb);
+
+ ip6h = ipv6_hdr(skb);
+ ip6h->payload_len = htons(skb->len - size);
+ ip6h->daddr = x->sel.daddr.in6;
+ ip6h->saddr = x->sel.saddr.in6;
+ err = 0;
+out:
+ return err;
+}
+
+static struct xfrm_mode xfrm6_beet_mode = {
+ .input2 = xfrm6_beet_input,
+ .input = xfrm_prepare_input,
+ .output2 = xfrm6_beet_output,
+ .output = xfrm6_prepare_output,
+ .owner = THIS_MODULE,
+ .encap = XFRM_MODE_BEET,
+ .flags = XFRM_MODE_FLAG_TUNNEL,
+};
+
+static int __init xfrm6_beet_init(void)
+{
+ return xfrm_register_mode(&xfrm6_beet_mode, AF_INET6);
+}
+
+static void __exit xfrm6_beet_exit(void)
+{
+ int err;
+
+ err = xfrm_unregister_mode(&xfrm6_beet_mode, AF_INET6);
+ BUG_ON(err);
+}
+
+module_init(xfrm6_beet_init);
+module_exit(xfrm6_beet_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_BEET);
diff --git a/net/ipv6/xfrm6_mode_ro.c b/net/ipv6/xfrm6_mode_ro.c
new file mode 100644
index 0000000..da28e44
--- /dev/null
+++ b/net/ipv6/xfrm6_mode_ro.c
@@ -0,0 +1,85 @@
+/*
+ * xfrm6_mode_ro.c - Route optimization mode for IPv6.
+ *
+ * Copyright (C)2003-2006 Helsinki University of Technology
+ * Copyright (C)2003-2006 USAGI/WIDE Project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Authors:
+ * Noriaki TAKAMIYA @USAGI
+ * Masahide NAKAMURA @USAGI
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/stringify.h>
+#include <linux/time.h>
+#include <net/ipv6.h>
+#include <net/xfrm.h>
+
+/* Add route optimization header space.
+ *
+ * The IP header and mutable extension headers will be moved forward to make
+ * space for the route optimization header.
+ */
+static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ipv6hdr *iph;
+ u8 *prevhdr;
+ int hdr_len;
+
+ iph = ipv6_hdr(skb);
+
+ hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
+ if (hdr_len < 0)
+ return hdr_len;
+ skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
+ skb_set_network_header(skb, -x->props.header_len);
+ skb->transport_header = skb->network_header + hdr_len;
+ __skb_pull(skb, hdr_len);
+ memmove(ipv6_hdr(skb), iph, hdr_len);
+
+ x->lastused = ktime_get_real_seconds();
+
+ return 0;
+}
+
+static struct xfrm_mode xfrm6_ro_mode = {
+ .output = xfrm6_ro_output,
+ .owner = THIS_MODULE,
+ .encap = XFRM_MODE_ROUTEOPTIMIZATION,
+};
+
+static int __init xfrm6_ro_init(void)
+{
+ return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);
+}
+
+static void __exit xfrm6_ro_exit(void)
+{
+ int err;
+
+ err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);
+ BUG_ON(err);
+}
+
+module_init(xfrm6_ro_init);
+module_exit(xfrm6_ro_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);
diff --git a/net/ipv6/xfrm6_mode_transport.c b/net/ipv6/xfrm6_mode_transport.c
new file mode 100644
index 0000000..3c29da5
--- /dev/null
+++ b/net/ipv6/xfrm6_mode_transport.c
@@ -0,0 +1,121 @@
+/*
+ * xfrm6_mode_transport.c - Transport mode encapsulation for IPv6.
+ *
+ * Copyright (C) 2002 USAGI/WIDE Project
+ * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/stringify.h>
+#include <net/dst.h>
+#include <net/ipv6.h>
+#include <net/xfrm.h>
+#include <net/protocol.h>
+
+/* Add encapsulation header.
+ *
+ * The IP header and mutable extension headers will be moved forward to make
+ * space for the encapsulation header.
+ */
+static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ipv6hdr *iph;
+ u8 *prevhdr;
+ int hdr_len;
+
+ iph = ipv6_hdr(skb);
+ skb_set_inner_transport_header(skb, skb_transport_offset(skb));
+
+ hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
+ if (hdr_len < 0)
+ return hdr_len;
+ skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
+ skb_set_network_header(skb, -x->props.header_len);
+ skb->transport_header = skb->network_header + hdr_len;
+ __skb_pull(skb, hdr_len);
+ memmove(ipv6_hdr(skb), iph, hdr_len);
+ return 0;
+}
+
+/* Remove encapsulation header.
+ *
+ * The IP header will be moved over the top of the encapsulation header.
+ *
+ * On entry, skb->h shall point to where the IP header should be and skb->nh
+ * shall be set to where the IP header currently is. skb->data shall point
+ * to the start of the payload.
+ */
+static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int ihl = skb->data - skb_transport_header(skb);
+
+ if (skb->transport_header != skb->network_header) {
+ memmove(skb_transport_header(skb),
+ skb_network_header(skb), ihl);
+ skb->network_header = skb->transport_header;
+ }
+ ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
+ sizeof(struct ipv6hdr));
+ skb_reset_transport_header(skb);
+ return 0;
+}
+
+static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,
+ struct sk_buff *skb,
+ netdev_features_t features)
+{
+ const struct net_offload *ops;
+ struct sk_buff *segs = ERR_PTR(-EINVAL);
+ struct xfrm_offload *xo = xfrm_offload(skb);
+
+ skb->transport_header += x->props.header_len;
+ ops = rcu_dereference(inet6_offloads[xo->proto]);
+ if (likely(ops && ops->callbacks.gso_segment))
+ segs = ops->callbacks.gso_segment(skb, features);
+
+ return segs;
+}
+
+static void xfrm6_transport_xmit(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct xfrm_offload *xo = xfrm_offload(skb);
+
+ skb_reset_mac_len(skb);
+ pskb_pull(skb, skb->mac_len + sizeof(struct ipv6hdr) + x->props.header_len);
+
+ if (xo->flags & XFRM_GSO_SEGMENT) {
+ skb_reset_transport_header(skb);
+ skb->transport_header -= x->props.header_len;
+ }
+}
+
+
+static struct xfrm_mode xfrm6_transport_mode = {
+ .input = xfrm6_transport_input,
+ .output = xfrm6_transport_output,
+ .gso_segment = xfrm4_transport_gso_segment,
+ .xmit = xfrm6_transport_xmit,
+ .owner = THIS_MODULE,
+ .encap = XFRM_MODE_TRANSPORT,
+};
+
+static int __init xfrm6_transport_init(void)
+{
+ return xfrm_register_mode(&xfrm6_transport_mode, AF_INET6);
+}
+
+static void __exit xfrm6_transport_exit(void)
+{
+ int err;
+
+ err = xfrm_unregister_mode(&xfrm6_transport_mode, AF_INET6);
+ BUG_ON(err);
+}
+
+module_init(xfrm6_transport_init);
+module_exit(xfrm6_transport_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TRANSPORT);
diff --git a/net/ipv6/xfrm6_mode_tunnel.c b/net/ipv6/xfrm6_mode_tunnel.c
new file mode 100644
index 0000000..de1b0b8
--- /dev/null
+++ b/net/ipv6/xfrm6_mode_tunnel.c
@@ -0,0 +1,151 @@
+/*
+ * xfrm6_mode_tunnel.c - Tunnel mode encapsulation for IPv6.
+ *
+ * Copyright (C) 2002 USAGI/WIDE Project
+ * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#include <linux/gfp.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/stringify.h>
+#include <net/dsfield.h>
+#include <net/dst.h>
+#include <net/inet_ecn.h>
+#include <net/ip6_route.h>
+#include <net/ipv6.h>
+#include <net/xfrm.h>
+
+static inline void ipip6_ecn_decapsulate(struct sk_buff *skb)
+{
+ struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
+
+ if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
+ IP6_ECN_set_ce(skb, inner_iph);
+}
+
+/* Add encapsulation header.
+ *
+ * The top IP header will be constructed per RFC 2401.
+ */
+static int xfrm6_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb_dst(skb);
+ struct ipv6hdr *top_iph;
+ int dsfield;
+
+ skb_set_inner_network_header(skb, skb_network_offset(skb));
+ skb_set_inner_transport_header(skb, skb_transport_offset(skb));
+
+ skb_set_network_header(skb, -x->props.header_len);
+ skb->mac_header = skb->network_header +
+ offsetof(struct ipv6hdr, nexthdr);
+ skb->transport_header = skb->network_header + sizeof(*top_iph);
+ top_iph = ipv6_hdr(skb);
+
+ top_iph->version = 6;
+
+ memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
+ sizeof(top_iph->flow_lbl));
+ top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family);
+
+ if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
+ dsfield = 0;
+ else
+ dsfield = XFRM_MODE_SKB_CB(skb)->tos;
+ dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos);
+ if (x->props.flags & XFRM_STATE_NOECN)
+ dsfield &= ~INET_ECN_MASK;
+ ipv6_change_dsfield(top_iph, 0, dsfield);
+ top_iph->hop_limit = ip6_dst_hoplimit(xfrm_dst_child(dst));
+ top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
+ top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
+ return 0;
+}
+
+#define for_each_input_rcu(head, handler) \
+ for (handler = rcu_dereference(head); \
+ handler != NULL; \
+ handler = rcu_dereference(handler->next))
+
+
+static int xfrm6_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int err = -EINVAL;
+
+ if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
+ goto out;
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ goto out;
+
+ err = skb_unclone(skb, GFP_ATOMIC);
+ if (err)
+ goto out;
+
+ if (x->props.flags & XFRM_STATE_DECAP_DSCP)
+ ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)),
+ ipipv6_hdr(skb));
+ if (!(x->props.flags & XFRM_STATE_NOECN))
+ ipip6_ecn_decapsulate(skb);
+
+ skb_reset_network_header(skb);
+ skb_mac_header_rebuild(skb);
+ if (skb->mac_len)
+ eth_hdr(skb)->h_proto = skb->protocol;
+
+ err = 0;
+
+out:
+ return err;
+}
+
+static struct sk_buff *xfrm6_mode_tunnel_gso_segment(struct xfrm_state *x,
+ struct sk_buff *skb,
+ netdev_features_t features)
+{
+ __skb_push(skb, skb->mac_len);
+ return skb_mac_gso_segment(skb, features);
+}
+
+static void xfrm6_mode_tunnel_xmit(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct xfrm_offload *xo = xfrm_offload(skb);
+
+ if (xo->flags & XFRM_GSO_SEGMENT)
+ skb->transport_header = skb->network_header + sizeof(struct ipv6hdr);
+
+ skb_reset_mac_len(skb);
+ pskb_pull(skb, skb->mac_len + x->props.header_len);
+}
+
+static struct xfrm_mode xfrm6_tunnel_mode = {
+ .input2 = xfrm6_mode_tunnel_input,
+ .input = xfrm_prepare_input,
+ .output2 = xfrm6_mode_tunnel_output,
+ .output = xfrm6_prepare_output,
+ .gso_segment = xfrm6_mode_tunnel_gso_segment,
+ .xmit = xfrm6_mode_tunnel_xmit,
+ .owner = THIS_MODULE,
+ .encap = XFRM_MODE_TUNNEL,
+ .flags = XFRM_MODE_FLAG_TUNNEL,
+};
+
+static int __init xfrm6_mode_tunnel_init(void)
+{
+ return xfrm_register_mode(&xfrm6_tunnel_mode, AF_INET6);
+}
+
+static void __exit xfrm6_mode_tunnel_exit(void)
+{
+ int err;
+
+ err = xfrm_unregister_mode(&xfrm6_tunnel_mode, AF_INET6);
+ BUG_ON(err);
+}
+
+module_init(xfrm6_mode_tunnel_init);
+module_exit(xfrm6_mode_tunnel_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TUNNEL);
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
new file mode 100644
index 0000000..6a74080
--- /dev/null
+++ b/net/ipv6/xfrm6_output.c
@@ -0,0 +1,195 @@
+/*
+ * xfrm6_output.c - Common IPsec encapsulation code for IPv6.
+ * Copyright (C) 2002 USAGI/WIDE Project
+ * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/if_ether.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/icmpv6.h>
+#include <linux/netfilter_ipv6.h>
+#include <net/dst.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/xfrm.h>
+
+int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
+ u8 **prevhdr)
+{
+ return ip6_find_1stfragopt(skb, prevhdr);
+}
+EXPORT_SYMBOL(xfrm6_find_1stfragopt);
+
+static int xfrm6_local_dontfrag(struct sk_buff *skb)
+{
+ int proto;
+ struct sock *sk = skb->sk;
+
+ if (sk) {
+ if (sk->sk_family != AF_INET6)
+ return 0;
+
+ proto = sk->sk_protocol;
+ if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
+ return inet6_sk(sk)->dontfrag;
+ }
+
+ return 0;
+}
+
+static void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu)
+{
+ struct flowi6 fl6;
+ struct sock *sk = skb->sk;
+
+ fl6.flowi6_oif = sk->sk_bound_dev_if;
+ fl6.daddr = ipv6_hdr(skb)->daddr;
+
+ ipv6_local_rxpmtu(sk, &fl6, mtu);
+}
+
+void xfrm6_local_error(struct sk_buff *skb, u32 mtu)
+{
+ struct flowi6 fl6;
+ const struct ipv6hdr *hdr;
+ struct sock *sk = skb->sk;
+
+ hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
+ fl6.fl6_dport = inet_sk(sk)->inet_dport;
+ fl6.daddr = hdr->daddr;
+
+ ipv6_local_error(sk, EMSGSIZE, &fl6, mtu);
+}
+
+static int xfrm6_tunnel_check_size(struct sk_buff *skb)
+{
+ int mtu, ret = 0;
+ struct dst_entry *dst = skb_dst(skb);
+
+ if (skb->ignore_df)
+ goto out;
+
+ mtu = dst_mtu(dst);
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
+
+ if ((!skb_is_gso(skb) && skb->len > mtu) ||
+ (skb_is_gso(skb) &&
+ !skb_gso_validate_network_len(skb, ip6_skb_dst_mtu(skb)))) {
+ skb->dev = dst->dev;
+ skb->protocol = htons(ETH_P_IPV6);
+
+ if (xfrm6_local_dontfrag(skb))
+ xfrm6_local_rxpmtu(skb, mtu);
+ else if (skb->sk)
+ xfrm_local_error(skb, mtu);
+ else
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ ret = -EMSGSIZE;
+ }
+out:
+ return ret;
+}
+
+int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int err;
+
+ err = xfrm6_tunnel_check_size(skb);
+ if (err)
+ return err;
+
+ XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
+
+ return xfrm6_extract_header(skb);
+}
+
+int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int err;
+
+ err = xfrm_inner_extract_output(x, skb);
+ if (err)
+ return err;
+
+ skb->ignore_df = 1;
+ skb->protocol = htons(ETH_P_IPV6);
+
+ return x->outer_mode->output2(x, skb);
+}
+EXPORT_SYMBOL(xfrm6_prepare_output);
+
+int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb)
+{
+ memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
+
+#ifdef CONFIG_NETFILTER
+ IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
+#endif
+
+ return xfrm_output(sk, skb);
+}
+
+static int __xfrm6_output_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ struct xfrm_state *x = skb_dst(skb)->xfrm;
+
+ return x->outer_mode->afinfo->output_finish(sk, skb);
+}
+
+static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb_dst(skb);
+ struct xfrm_state *x = dst->xfrm;
+ int mtu;
+ bool toobig;
+
+#ifdef CONFIG_NETFILTER
+ if (!x) {
+ IP6CB(skb)->flags |= IP6SKB_REROUTED;
+ return dst_output(net, sk, skb);
+ }
+#endif
+
+ if (x->props.mode != XFRM_MODE_TUNNEL)
+ goto skip_frag;
+
+ if (skb->protocol == htons(ETH_P_IPV6))
+ mtu = ip6_skb_dst_mtu(skb);
+ else
+ mtu = dst_mtu(skb_dst(skb));
+
+ toobig = skb->len > mtu && !skb_is_gso(skb);
+
+ if (toobig && xfrm6_local_dontfrag(skb)) {
+ xfrm6_local_rxpmtu(skb, mtu);
+ kfree_skb(skb);
+ return -EMSGSIZE;
+ } else if (!skb->ignore_df && toobig && skb->sk) {
+ xfrm_local_error(skb, mtu);
+ kfree_skb(skb);
+ return -EMSGSIZE;
+ }
+
+ if (toobig || dst_allfrag(skb_dst(skb)))
+ return ip6_fragment(net, sk, skb,
+ __xfrm6_output_finish);
+
+skip_frag:
+ return x->outer_mode->afinfo->output_finish(sk, skb);
+}
+
+int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
+ net, sk, skb, NULL, skb_dst(skb)->dev,
+ __xfrm6_output,
+ !(IP6CB(skb)->flags & IP6SKB_REROUTED));
+}
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
new file mode 100644
index 0000000..d35bcf9
--- /dev/null
+++ b/net/ipv6/xfrm6_policy.c
@@ -0,0 +1,434 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * xfrm6_policy.c: based on xfrm4_policy.c
+ *
+ * Authors:
+ * Mitsuru KANDA @USAGI
+ * Kazunori MIYAZAWA @USAGI
+ * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ * IPv6 support
+ * YOSHIFUJI Hideaki
+ * Split up af-specific portion
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <net/addrconf.h>
+#include <net/dst.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/l3mdev.h>
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+#include <net/mip6.h>
+#endif
+
+static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif,
+ const xfrm_address_t *saddr,
+ const xfrm_address_t *daddr,
+ u32 mark)
+{
+ struct flowi6 fl6;
+ struct dst_entry *dst;
+ int err;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_oif = l3mdev_master_ifindex_by_index(net, oif);
+ fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF;
+ fl6.flowi6_mark = mark;
+ memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
+ if (saddr)
+ memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
+
+ dst = ip6_route_output(net, NULL, &fl6);
+
+ err = dst->error;
+ if (dst->error) {
+ dst_release(dst);
+ dst = ERR_PTR(err);
+ }
+
+ return dst;
+}
+
+static int xfrm6_get_saddr(struct net *net, int oif,
+ xfrm_address_t *saddr, xfrm_address_t *daddr,
+ u32 mark)
+{
+ struct dst_entry *dst;
+ struct net_device *dev;
+
+ dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr, mark);
+ if (IS_ERR(dst))
+ return -EHOSTUNREACH;
+
+ dev = ip6_dst_idev(dst)->dev;
+ ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6);
+ dst_release(dst);
+ return 0;
+}
+
+static int xfrm6_get_tos(const struct flowi *fl)
+{
+ return 0;
+}
+
+static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
+ int nfheader_len)
+{
+ if (dst->ops->family == AF_INET6) {
+ struct rt6_info *rt = (struct rt6_info *)dst;
+ path->path_cookie = rt6_get_cookie(rt);
+ }
+
+ path->u.rt6.rt6i_nfheader_len = nfheader_len;
+
+ return 0;
+}
+
+static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
+ const struct flowi *fl)
+{
+ struct rt6_info *rt = (struct rt6_info *)xdst->route;
+
+ xdst->u.dst.dev = dev;
+ dev_hold(dev);
+
+ xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
+ if (!xdst->u.rt6.rt6i_idev) {
+ dev_put(dev);
+ return -ENODEV;
+ }
+
+ /* Sheit... I remember I did this right. Apparently,
+ * it was magically lost, so this code needs audit */
+ xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
+ RTF_LOCAL);
+ xdst->route_cookie = rt6_get_cookie(rt);
+ xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
+ xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
+ xdst->u.rt6.rt6i_src = rt->rt6i_src;
+ INIT_LIST_HEAD(&xdst->u.rt6.rt6i_uncached);
+ rt6_uncached_list_add(&xdst->u.rt6);
+ atomic_inc(&dev_net(dev)->ipv6.rt6_stats->fib_rt_uncache);
+
+ return 0;
+}
+
+static inline void
+_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
+{
+ struct flowi6 *fl6 = &fl->u.ip6;
+ int onlyproto = 0;
+ const struct ipv6hdr *hdr = ipv6_hdr(skb);
+ u32 offset = sizeof(*hdr);
+ struct ipv6_opt_hdr *exthdr;
+ const unsigned char *nh = skb_network_header(skb);
+ u16 nhoff = IP6CB(skb)->nhoff;
+ int oif = 0;
+ u8 nexthdr;
+
+ if (!nhoff)
+ nhoff = offsetof(struct ipv6hdr, nexthdr);
+
+ nexthdr = nh[nhoff];
+
+ if (skb_dst(skb))
+ oif = skb_dst(skb)->dev->ifindex;
+
+ memset(fl6, 0, sizeof(struct flowi6));
+ fl6->flowi6_mark = skb->mark;
+ fl6->flowi6_oif = reverse ? skb->skb_iif : oif;
+
+ fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
+ fl6->saddr = reverse ? hdr->daddr : hdr->saddr;
+
+ while (nh + offset + sizeof(*exthdr) < skb->data ||
+ pskb_may_pull(skb, nh + offset + sizeof(*exthdr) - skb->data)) {
+ nh = skb_network_header(skb);
+ exthdr = (struct ipv6_opt_hdr *)(nh + offset);
+
+ switch (nexthdr) {
+ case NEXTHDR_FRAGMENT:
+ onlyproto = 1;
+ /* fall through */
+ case NEXTHDR_ROUTING:
+ case NEXTHDR_HOP:
+ case NEXTHDR_DEST:
+ offset += ipv6_optlen(exthdr);
+ nexthdr = exthdr->nexthdr;
+ exthdr = (struct ipv6_opt_hdr *)(nh + offset);
+ break;
+
+ case IPPROTO_UDP:
+ case IPPROTO_UDPLITE:
+ case IPPROTO_TCP:
+ case IPPROTO_SCTP:
+ case IPPROTO_DCCP:
+ if (!onlyproto && (nh + offset + 4 < skb->data ||
+ pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
+ __be16 *ports;
+
+ nh = skb_network_header(skb);
+ ports = (__be16 *)(nh + offset);
+ fl6->fl6_sport = ports[!!reverse];
+ fl6->fl6_dport = ports[!reverse];
+ }
+ fl6->flowi6_proto = nexthdr;
+ return;
+
+ case IPPROTO_ICMPV6:
+ if (!onlyproto && (nh + offset + 2 < skb->data ||
+ pskb_may_pull(skb, nh + offset + 2 - skb->data))) {
+ u8 *icmp;
+
+ nh = skb_network_header(skb);
+ icmp = (u8 *)(nh + offset);
+ fl6->fl6_icmp_type = icmp[0];
+ fl6->fl6_icmp_code = icmp[1];
+ }
+ fl6->flowi6_proto = nexthdr;
+ return;
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ case IPPROTO_MH:
+ offset += ipv6_optlen(exthdr);
+ if (!onlyproto && (nh + offset + 3 < skb->data ||
+ pskb_may_pull(skb, nh + offset + 3 - skb->data))) {
+ struct ip6_mh *mh;
+
+ nh = skb_network_header(skb);
+ mh = (struct ip6_mh *)(nh + offset);
+ fl6->fl6_mh_type = mh->ip6mh_type;
+ }
+ fl6->flowi6_proto = nexthdr;
+ return;
+#endif
+
+ /* XXX Why are there these headers? */
+ case IPPROTO_AH:
+ case IPPROTO_ESP:
+ case IPPROTO_COMP:
+ default:
+ fl6->fl6_ipsec_spi = 0;
+ fl6->flowi6_proto = nexthdr;
+ return;
+ }
+ }
+}
+
+static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb, u32 mtu)
+{
+ struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+ struct dst_entry *path = xdst->route;
+
+ path->ops->update_pmtu(path, sk, skb, mtu);
+}
+
+static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+ struct dst_entry *path = xdst->route;
+
+ path->ops->redirect(path, sk, skb);
+}
+
+static void xfrm6_dst_destroy(struct dst_entry *dst)
+{
+ struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+
+ if (likely(xdst->u.rt6.rt6i_idev))
+ in6_dev_put(xdst->u.rt6.rt6i_idev);
+ dst_destroy_metrics_generic(dst);
+ if (xdst->u.rt6.rt6i_uncached_list)
+ rt6_uncached_list_del(&xdst->u.rt6);
+ xfrm_dst_destroy(xdst);
+}
+
+static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
+ int unregister)
+{
+ struct xfrm_dst *xdst;
+
+ if (!unregister)
+ return;
+
+ xdst = (struct xfrm_dst *)dst;
+ if (xdst->u.rt6.rt6i_idev->dev == dev) {
+ struct inet6_dev *loopback_idev =
+ in6_dev_get(dev_net(dev)->loopback_dev);
+ BUG_ON(!loopback_idev);
+
+ do {
+ in6_dev_put(xdst->u.rt6.rt6i_idev);
+ xdst->u.rt6.rt6i_idev = loopback_idev;
+ in6_dev_hold(loopback_idev);
+ xdst = (struct xfrm_dst *)xfrm_dst_child(&xdst->u.dst);
+ } while (xdst->u.dst.xfrm);
+
+ __in6_dev_put(loopback_idev);
+ }
+
+ xfrm_dst_ifdown(dst, dev);
+}
+
+static struct dst_ops xfrm6_dst_ops_template = {
+ .family = AF_INET6,
+ .update_pmtu = xfrm6_update_pmtu,
+ .redirect = xfrm6_redirect,
+ .cow_metrics = dst_cow_metrics_generic,
+ .destroy = xfrm6_dst_destroy,
+ .ifdown = xfrm6_dst_ifdown,
+ .local_out = __ip6_local_out,
+ .gc_thresh = 32768,
+};
+
+static const struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
+ .dst_ops = &xfrm6_dst_ops_template,
+ .dst_lookup = xfrm6_dst_lookup,
+ .get_saddr = xfrm6_get_saddr,
+ .decode_session = _decode_session6,
+ .get_tos = xfrm6_get_tos,
+ .init_path = xfrm6_init_path,
+ .fill_dst = xfrm6_fill_dst,
+ .blackhole_route = ip6_blackhole_route,
+};
+
+static int __init xfrm6_policy_init(void)
+{
+ return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo, AF_INET6);
+}
+
+static void xfrm6_policy_fini(void)
+{
+ xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
+}
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table xfrm6_policy_table[] = {
+ {
+ .procname = "xfrm6_gc_thresh",
+ .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { }
+};
+
+static int __net_init xfrm6_net_sysctl_init(struct net *net)
+{
+ struct ctl_table *table;
+ struct ctl_table_header *hdr;
+
+ table = xfrm6_policy_table;
+ if (!net_eq(net, &init_net)) {
+ table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
+ if (!table)
+ goto err_alloc;
+
+ table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
+ }
+
+ hdr = register_net_sysctl(net, "net/ipv6", table);
+ if (!hdr)
+ goto err_reg;
+
+ net->ipv6.sysctl.xfrm6_hdr = hdr;
+ return 0;
+
+err_reg:
+ if (!net_eq(net, &init_net))
+ kfree(table);
+err_alloc:
+ return -ENOMEM;
+}
+
+static void __net_exit xfrm6_net_sysctl_exit(struct net *net)
+{
+ struct ctl_table *table;
+
+ if (!net->ipv6.sysctl.xfrm6_hdr)
+ return;
+
+ table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg;
+ unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr);
+ if (!net_eq(net, &init_net))
+ kfree(table);
+}
+#else /* CONFIG_SYSCTL */
+static inline int xfrm6_net_sysctl_init(struct net *net)
+{
+ return 0;
+}
+
+static inline void xfrm6_net_sysctl_exit(struct net *net)
+{
+}
+#endif
+
+static int __net_init xfrm6_net_init(struct net *net)
+{
+ int ret;
+
+ memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template,
+ sizeof(xfrm6_dst_ops_template));
+ ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops);
+ if (ret)
+ return ret;
+
+ ret = xfrm6_net_sysctl_init(net);
+ if (ret)
+ dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
+
+ return ret;
+}
+
+static void __net_exit xfrm6_net_exit(struct net *net)
+{
+ xfrm6_net_sysctl_exit(net);
+ dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
+}
+
+static struct pernet_operations xfrm6_net_ops = {
+ .init = xfrm6_net_init,
+ .exit = xfrm6_net_exit,
+};
+
+int __init xfrm6_init(void)
+{
+ int ret;
+
+ ret = xfrm6_policy_init();
+ if (ret)
+ goto out;
+ ret = xfrm6_state_init();
+ if (ret)
+ goto out_policy;
+
+ ret = xfrm6_protocol_init();
+ if (ret)
+ goto out_state;
+
+ register_pernet_subsys(&xfrm6_net_ops);
+out:
+ return ret;
+out_state:
+ xfrm6_state_fini();
+out_policy:
+ xfrm6_policy_fini();
+ goto out;
+}
+
+void xfrm6_fini(void)
+{
+ unregister_pernet_subsys(&xfrm6_net_ops);
+ xfrm6_protocol_fini();
+ xfrm6_policy_fini();
+ xfrm6_state_fini();
+}
diff --git a/net/ipv6/xfrm6_protocol.c b/net/ipv6/xfrm6_protocol.c
new file mode 100644
index 0000000..b2dc8ce
--- /dev/null
+++ b/net/ipv6/xfrm6_protocol.c
@@ -0,0 +1,278 @@
+/* xfrm6_protocol.c - Generic xfrm protocol multiplexer for ipv6.
+ *
+ * Copyright (C) 2013 secunet Security Networks AG
+ *
+ * Author:
+ * Steffen Klassert <steffen.klassert@secunet.com>
+ *
+ * Based on:
+ * net/ipv4/xfrm4_protocol.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/skbuff.h>
+#include <linux/icmpv6.h>
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/xfrm.h>
+
+static struct xfrm6_protocol __rcu *esp6_handlers __read_mostly;
+static struct xfrm6_protocol __rcu *ah6_handlers __read_mostly;
+static struct xfrm6_protocol __rcu *ipcomp6_handlers __read_mostly;
+static DEFINE_MUTEX(xfrm6_protocol_mutex);
+
+static inline struct xfrm6_protocol __rcu **proto_handlers(u8 protocol)
+{
+ switch (protocol) {
+ case IPPROTO_ESP:
+ return &esp6_handlers;
+ case IPPROTO_AH:
+ return &ah6_handlers;
+ case IPPROTO_COMP:
+ return &ipcomp6_handlers;
+ }
+
+ return NULL;
+}
+
+#define for_each_protocol_rcu(head, handler) \
+ for (handler = rcu_dereference(head); \
+ handler != NULL; \
+ handler = rcu_dereference(handler->next)) \
+
+int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err)
+{
+ int ret;
+ struct xfrm6_protocol *handler;
+ struct xfrm6_protocol __rcu **head = proto_handlers(protocol);
+
+ if (!head)
+ return 0;
+
+ for_each_protocol_rcu(*proto_handlers(protocol), handler)
+ if ((ret = handler->cb_handler(skb, err)) <= 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(xfrm6_rcv_cb);
+
+static int xfrm6_esp_rcv(struct sk_buff *skb)
+{
+ int ret;
+ struct xfrm6_protocol *handler;
+
+ XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
+
+ for_each_protocol_rcu(esp6_handlers, handler)
+ if ((ret = handler->handler(skb)) != -EINVAL)
+ return ret;
+
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
+
+ kfree_skb(skb);
+ return 0;
+}
+
+static void xfrm6_esp_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct xfrm6_protocol *handler;
+
+ for_each_protocol_rcu(esp6_handlers, handler)
+ if (!handler->err_handler(skb, opt, type, code, offset, info))
+ break;
+}
+
+static int xfrm6_ah_rcv(struct sk_buff *skb)
+{
+ int ret;
+ struct xfrm6_protocol *handler;
+
+ XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
+
+ for_each_protocol_rcu(ah6_handlers, handler)
+ if ((ret = handler->handler(skb)) != -EINVAL)
+ return ret;
+
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
+
+ kfree_skb(skb);
+ return 0;
+}
+
+static void xfrm6_ah_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct xfrm6_protocol *handler;
+
+ for_each_protocol_rcu(ah6_handlers, handler)
+ if (!handler->err_handler(skb, opt, type, code, offset, info))
+ break;
+}
+
+static int xfrm6_ipcomp_rcv(struct sk_buff *skb)
+{
+ int ret;
+ struct xfrm6_protocol *handler;
+
+ XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
+
+ for_each_protocol_rcu(ipcomp6_handlers, handler)
+ if ((ret = handler->handler(skb)) != -EINVAL)
+ return ret;
+
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
+
+ kfree_skb(skb);
+ return 0;
+}
+
+static void xfrm6_ipcomp_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct xfrm6_protocol *handler;
+
+ for_each_protocol_rcu(ipcomp6_handlers, handler)
+ if (!handler->err_handler(skb, opt, type, code, offset, info))
+ break;
+}
+
+static const struct inet6_protocol esp6_protocol = {
+ .handler = xfrm6_esp_rcv,
+ .err_handler = xfrm6_esp_err,
+ .flags = INET6_PROTO_NOPOLICY,
+};
+
+static const struct inet6_protocol ah6_protocol = {
+ .handler = xfrm6_ah_rcv,
+ .err_handler = xfrm6_ah_err,
+ .flags = INET6_PROTO_NOPOLICY,
+};
+
+static const struct inet6_protocol ipcomp6_protocol = {
+ .handler = xfrm6_ipcomp_rcv,
+ .err_handler = xfrm6_ipcomp_err,
+ .flags = INET6_PROTO_NOPOLICY,
+};
+
+static const struct xfrm_input_afinfo xfrm6_input_afinfo = {
+ .family = AF_INET6,
+ .callback = xfrm6_rcv_cb,
+};
+
+static inline const struct inet6_protocol *netproto(unsigned char protocol)
+{
+ switch (protocol) {
+ case IPPROTO_ESP:
+ return &esp6_protocol;
+ case IPPROTO_AH:
+ return &ah6_protocol;
+ case IPPROTO_COMP:
+ return &ipcomp6_protocol;
+ }
+
+ return NULL;
+}
+
+int xfrm6_protocol_register(struct xfrm6_protocol *handler,
+ unsigned char protocol)
+{
+ struct xfrm6_protocol __rcu **pprev;
+ struct xfrm6_protocol *t;
+ bool add_netproto = false;
+ int ret = -EEXIST;
+ int priority = handler->priority;
+
+ if (!proto_handlers(protocol) || !netproto(protocol))
+ return -EINVAL;
+
+ mutex_lock(&xfrm6_protocol_mutex);
+
+ if (!rcu_dereference_protected(*proto_handlers(protocol),
+ lockdep_is_held(&xfrm6_protocol_mutex)))
+ add_netproto = true;
+
+ for (pprev = proto_handlers(protocol);
+ (t = rcu_dereference_protected(*pprev,
+ lockdep_is_held(&xfrm6_protocol_mutex))) != NULL;
+ pprev = &t->next) {
+ if (t->priority < priority)
+ break;
+ if (t->priority == priority)
+ goto err;
+ }
+
+ handler->next = *pprev;
+ rcu_assign_pointer(*pprev, handler);
+
+ ret = 0;
+
+err:
+ mutex_unlock(&xfrm6_protocol_mutex);
+
+ if (add_netproto) {
+ if (inet6_add_protocol(netproto(protocol), protocol)) {
+ pr_err("%s: can't add protocol\n", __func__);
+ ret = -EAGAIN;
+ }
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(xfrm6_protocol_register);
+
+int xfrm6_protocol_deregister(struct xfrm6_protocol *handler,
+ unsigned char protocol)
+{
+ struct xfrm6_protocol __rcu **pprev;
+ struct xfrm6_protocol *t;
+ int ret = -ENOENT;
+
+ if (!proto_handlers(protocol) || !netproto(protocol))
+ return -EINVAL;
+
+ mutex_lock(&xfrm6_protocol_mutex);
+
+ for (pprev = proto_handlers(protocol);
+ (t = rcu_dereference_protected(*pprev,
+ lockdep_is_held(&xfrm6_protocol_mutex))) != NULL;
+ pprev = &t->next) {
+ if (t == handler) {
+ *pprev = handler->next;
+ ret = 0;
+ break;
+ }
+ }
+
+ if (!rcu_dereference_protected(*proto_handlers(protocol),
+ lockdep_is_held(&xfrm6_protocol_mutex))) {
+ if (inet6_del_protocol(netproto(protocol), protocol) < 0) {
+ pr_err("%s: can't remove protocol\n", __func__);
+ ret = -EAGAIN;
+ }
+ }
+
+ mutex_unlock(&xfrm6_protocol_mutex);
+
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL(xfrm6_protocol_deregister);
+
+int __init xfrm6_protocol_init(void)
+{
+ return xfrm_input_register_afinfo(&xfrm6_input_afinfo);
+}
+
+void xfrm6_protocol_fini(void)
+{
+ xfrm_input_unregister_afinfo(&xfrm6_input_afinfo);
+}
diff --git a/net/ipv6/xfrm6_state.c b/net/ipv6/xfrm6_state.c
new file mode 100644
index 0000000..5bdca3d
--- /dev/null
+++ b/net/ipv6/xfrm6_state.c
@@ -0,0 +1,196 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * xfrm6_state.c: based on xfrm4_state.c
+ *
+ * Authors:
+ * Mitsuru KANDA @USAGI
+ * Kazunori MIYAZAWA @USAGI
+ * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ * IPv6 support
+ * YOSHIFUJI Hideaki @USAGI
+ * Split up af-specific portion
+ *
+ */
+
+#include <net/xfrm.h>
+#include <linux/pfkeyv2.h>
+#include <linux/ipsec.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/export.h>
+#include <net/dsfield.h>
+#include <net/ipv6.h>
+#include <net/addrconf.h>
+
+static void
+__xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
+{
+ const struct flowi6 *fl6 = &fl->u.ip6;
+
+ /* Initialize temporary selector matching only
+ * to current session. */
+ *(struct in6_addr *)&sel->daddr = fl6->daddr;
+ *(struct in6_addr *)&sel->saddr = fl6->saddr;
+ sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
+ sel->dport_mask = htons(0xffff);
+ sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
+ sel->sport_mask = htons(0xffff);
+ sel->family = AF_INET6;
+ sel->prefixlen_d = 128;
+ sel->prefixlen_s = 128;
+ sel->proto = fl6->flowi6_proto;
+ sel->ifindex = fl6->flowi6_oif;
+}
+
+static void
+xfrm6_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
+ const xfrm_address_t *daddr, const xfrm_address_t *saddr)
+{
+ x->id = tmpl->id;
+ if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
+ memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
+ memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
+ if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
+ memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
+ x->props.mode = tmpl->mode;
+ x->props.reqid = tmpl->reqid;
+ x->props.family = AF_INET6;
+}
+
+/* distribution counting sort function for xfrm_state and xfrm_tmpl */
+static int
+__xfrm6_sort(void **dst, void **src, int n, int (*cmp)(void *p), int maxclass)
+{
+ int count[XFRM_MAX_DEPTH] = { };
+ int class[XFRM_MAX_DEPTH];
+ int i;
+
+ for (i = 0; i < n; i++) {
+ int c;
+ class[i] = c = cmp(src[i]);
+ count[c]++;
+ }
+
+ for (i = 2; i < maxclass; i++)
+ count[i] += count[i - 1];
+
+ for (i = 0; i < n; i++) {
+ dst[count[class[i] - 1]++] = src[i];
+ src[i] = NULL;
+ }
+
+ return 0;
+}
+
+/*
+ * Rule for xfrm_state:
+ *
+ * rule 1: select IPsec transport except AH
+ * rule 2: select MIPv6 RO or inbound trigger
+ * rule 3: select IPsec transport AH
+ * rule 4: select IPsec tunnel
+ * rule 5: others
+ */
+static int __xfrm6_state_sort_cmp(void *p)
+{
+ struct xfrm_state *v = p;
+
+ switch (v->props.mode) {
+ case XFRM_MODE_TRANSPORT:
+ if (v->id.proto != IPPROTO_AH)
+ return 1;
+ else
+ return 3;
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ case XFRM_MODE_ROUTEOPTIMIZATION:
+ case XFRM_MODE_IN_TRIGGER:
+ return 2;
+#endif
+ case XFRM_MODE_TUNNEL:
+ case XFRM_MODE_BEET:
+ return 4;
+ }
+ return 5;
+}
+
+static int
+__xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n)
+{
+ return __xfrm6_sort((void **)dst, (void **)src, n,
+ __xfrm6_state_sort_cmp, 6);
+}
+
+/*
+ * Rule for xfrm_tmpl:
+ *
+ * rule 1: select IPsec transport
+ * rule 2: select MIPv6 RO or inbound trigger
+ * rule 3: select IPsec tunnel
+ * rule 4: others
+ */
+static int __xfrm6_tmpl_sort_cmp(void *p)
+{
+ struct xfrm_tmpl *v = p;
+ switch (v->mode) {
+ case XFRM_MODE_TRANSPORT:
+ return 1;
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ case XFRM_MODE_ROUTEOPTIMIZATION:
+ case XFRM_MODE_IN_TRIGGER:
+ return 2;
+#endif
+ case XFRM_MODE_TUNNEL:
+ case XFRM_MODE_BEET:
+ return 3;
+ }
+ return 4;
+}
+
+static int
+__xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n)
+{
+ return __xfrm6_sort((void **)dst, (void **)src, n,
+ __xfrm6_tmpl_sort_cmp, 5);
+}
+
+int xfrm6_extract_header(struct sk_buff *skb)
+{
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+
+ XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
+ XFRM_MODE_SKB_CB(skb)->id = 0;
+ XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
+ XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
+ XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
+ XFRM_MODE_SKB_CB(skb)->optlen = 0;
+ memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
+ sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
+
+ return 0;
+}
+
+static struct xfrm_state_afinfo xfrm6_state_afinfo = {
+ .family = AF_INET6,
+ .proto = IPPROTO_IPV6,
+ .eth_proto = htons(ETH_P_IPV6),
+ .owner = THIS_MODULE,
+ .init_tempsel = __xfrm6_init_tempsel,
+ .init_temprop = xfrm6_init_temprop,
+ .tmpl_sort = __xfrm6_tmpl_sort,
+ .state_sort = __xfrm6_state_sort,
+ .output = xfrm6_output,
+ .output_finish = xfrm6_output_finish,
+ .extract_input = xfrm6_extract_input,
+ .extract_output = xfrm6_extract_output,
+ .transport_finish = xfrm6_transport_finish,
+ .local_error = xfrm6_local_error,
+};
+
+int __init xfrm6_state_init(void)
+{
+ return xfrm_state_register_afinfo(&xfrm6_state_afinfo);
+}
+
+void xfrm6_state_fini(void)
+{
+ xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
+}
diff --git a/net/ipv6/xfrm6_tunnel.c b/net/ipv6/xfrm6_tunnel.c
new file mode 100644
index 0000000..4a46df8
--- /dev/null
+++ b/net/ipv6/xfrm6_tunnel.c
@@ -0,0 +1,408 @@
+/*
+ * Copyright (C)2003,2004 USAGI/WIDE Project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors Mitsuru KANDA <mk@linux-ipv6.org>
+ * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
+ *
+ * Based on net/ipv4/xfrm4_tunnel.c
+ *
+ */
+#include <linux/module.h>
+#include <linux/xfrm.h>
+#include <linux/slab.h>
+#include <linux/rculist.h>
+#include <net/ip.h>
+#include <net/xfrm.h>
+#include <net/ipv6.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/mutex.h>
+#include <net/netns/generic.h>
+
+#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
+#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
+
+#define XFRM6_TUNNEL_SPI_MIN 1
+#define XFRM6_TUNNEL_SPI_MAX 0xffffffff
+
+struct xfrm6_tunnel_net {
+ struct hlist_head spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
+ struct hlist_head spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
+ u32 spi;
+};
+
+static unsigned int xfrm6_tunnel_net_id __read_mostly;
+static inline struct xfrm6_tunnel_net *xfrm6_tunnel_pernet(struct net *net)
+{
+ return net_generic(net, xfrm6_tunnel_net_id);
+}
+
+/*
+ * xfrm_tunnel_spi things are for allocating unique id ("spi")
+ * per xfrm_address_t.
+ */
+struct xfrm6_tunnel_spi {
+ struct hlist_node list_byaddr;
+ struct hlist_node list_byspi;
+ xfrm_address_t addr;
+ u32 spi;
+ refcount_t refcnt;
+ struct rcu_head rcu_head;
+};
+
+static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock);
+
+static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
+
+static inline unsigned int xfrm6_tunnel_spi_hash_byaddr(const xfrm_address_t *addr)
+{
+ unsigned int h;
+
+ h = ipv6_addr_hash((const struct in6_addr *)addr);
+ h ^= h >> 16;
+ h ^= h >> 8;
+ h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
+
+ return h;
+}
+
+static inline unsigned int xfrm6_tunnel_spi_hash_byspi(u32 spi)
+{
+ return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
+}
+
+static struct xfrm6_tunnel_spi *__xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr)
+{
+ struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
+ struct xfrm6_tunnel_spi *x6spi;
+
+ hlist_for_each_entry_rcu(x6spi,
+ &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
+ list_byaddr) {
+ if (xfrm6_addr_equal(&x6spi->addr, saddr))
+ return x6spi;
+ }
+
+ return NULL;
+}
+
+__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr)
+{
+ struct xfrm6_tunnel_spi *x6spi;
+ u32 spi;
+
+ rcu_read_lock_bh();
+ x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
+ spi = x6spi ? x6spi->spi : 0;
+ rcu_read_unlock_bh();
+ return htonl(spi);
+}
+EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
+
+static int __xfrm6_tunnel_spi_check(struct net *net, u32 spi)
+{
+ struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
+ struct xfrm6_tunnel_spi *x6spi;
+ int index = xfrm6_tunnel_spi_hash_byspi(spi);
+
+ hlist_for_each_entry(x6spi,
+ &xfrm6_tn->spi_byspi[index],
+ list_byspi) {
+ if (x6spi->spi == spi)
+ return -1;
+ }
+ return index;
+}
+
+static u32 __xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
+{
+ struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
+ u32 spi;
+ struct xfrm6_tunnel_spi *x6spi;
+ int index;
+
+ if (xfrm6_tn->spi < XFRM6_TUNNEL_SPI_MIN ||
+ xfrm6_tn->spi >= XFRM6_TUNNEL_SPI_MAX)
+ xfrm6_tn->spi = XFRM6_TUNNEL_SPI_MIN;
+ else
+ xfrm6_tn->spi++;
+
+ for (spi = xfrm6_tn->spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
+ index = __xfrm6_tunnel_spi_check(net, spi);
+ if (index >= 0)
+ goto alloc_spi;
+ }
+ for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) {
+ index = __xfrm6_tunnel_spi_check(net, spi);
+ if (index >= 0)
+ goto alloc_spi;
+ }
+ spi = 0;
+ goto out;
+alloc_spi:
+ xfrm6_tn->spi = spi;
+ x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
+ if (!x6spi)
+ goto out;
+
+ memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
+ x6spi->spi = spi;
+ refcount_set(&x6spi->refcnt, 1);
+
+ hlist_add_head_rcu(&x6spi->list_byspi, &xfrm6_tn->spi_byspi[index]);
+
+ index = xfrm6_tunnel_spi_hash_byaddr(saddr);
+ hlist_add_head_rcu(&x6spi->list_byaddr, &xfrm6_tn->spi_byaddr[index]);
+out:
+ return spi;
+}
+
+__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
+{
+ struct xfrm6_tunnel_spi *x6spi;
+ u32 spi;
+
+ spin_lock_bh(&xfrm6_tunnel_spi_lock);
+ x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
+ if (x6spi) {
+ refcount_inc(&x6spi->refcnt);
+ spi = x6spi->spi;
+ } else
+ spi = __xfrm6_tunnel_alloc_spi(net, saddr);
+ spin_unlock_bh(&xfrm6_tunnel_spi_lock);
+
+ return htonl(spi);
+}
+EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
+
+static void x6spi_destroy_rcu(struct rcu_head *head)
+{
+ kmem_cache_free(xfrm6_tunnel_spi_kmem,
+ container_of(head, struct xfrm6_tunnel_spi, rcu_head));
+}
+
+static void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr)
+{
+ struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
+ struct xfrm6_tunnel_spi *x6spi;
+ struct hlist_node *n;
+
+ spin_lock_bh(&xfrm6_tunnel_spi_lock);
+
+ hlist_for_each_entry_safe(x6spi, n,
+ &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
+ list_byaddr)
+ {
+ if (xfrm6_addr_equal(&x6spi->addr, saddr)) {
+ if (refcount_dec_and_test(&x6spi->refcnt)) {
+ hlist_del_rcu(&x6spi->list_byaddr);
+ hlist_del_rcu(&x6spi->list_byspi);
+ call_rcu(&x6spi->rcu_head, x6spi_destroy_rcu);
+ break;
+ }
+ }
+ }
+ spin_unlock_bh(&xfrm6_tunnel_spi_lock);
+}
+
+static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ skb_push(skb, -skb_network_offset(skb));
+ return 0;
+}
+
+static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ return skb_network_header(skb)[IP6CB(skb)->nhoff];
+}
+
+static int xfrm6_tunnel_rcv(struct sk_buff *skb)
+{
+ struct net *net = dev_net(skb->dev);
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ __be32 spi;
+
+ spi = xfrm6_tunnel_spi_lookup(net, (const xfrm_address_t *)&iph->saddr);
+ return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL);
+}
+
+static int xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ /* xfrm6_tunnel native err handling */
+ switch (type) {
+ case ICMPV6_DEST_UNREACH:
+ switch (code) {
+ case ICMPV6_NOROUTE:
+ case ICMPV6_ADM_PROHIBITED:
+ case ICMPV6_NOT_NEIGHBOUR:
+ case ICMPV6_ADDR_UNREACH:
+ case ICMPV6_PORT_UNREACH:
+ default:
+ break;
+ }
+ break;
+ case ICMPV6_PKT_TOOBIG:
+ break;
+ case ICMPV6_TIME_EXCEED:
+ switch (code) {
+ case ICMPV6_EXC_HOPLIMIT:
+ break;
+ case ICMPV6_EXC_FRAGTIME:
+ default:
+ break;
+ }
+ break;
+ case ICMPV6_PARAMPROB:
+ switch (code) {
+ case ICMPV6_HDR_FIELD: break;
+ case ICMPV6_UNK_NEXTHDR: break;
+ case ICMPV6_UNK_OPTION: break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int xfrm6_tunnel_init_state(struct xfrm_state *x)
+{
+ if (x->props.mode != XFRM_MODE_TUNNEL)
+ return -EINVAL;
+
+ if (x->encap)
+ return -EINVAL;
+
+ x->props.header_len = sizeof(struct ipv6hdr);
+
+ return 0;
+}
+
+static void xfrm6_tunnel_destroy(struct xfrm_state *x)
+{
+ struct net *net = xs_net(x);
+
+ xfrm6_tunnel_free_spi(net, (xfrm_address_t *)&x->props.saddr);
+}
+
+static const struct xfrm_type xfrm6_tunnel_type = {
+ .description = "IP6IP6",
+ .owner = THIS_MODULE,
+ .proto = IPPROTO_IPV6,
+ .init_state = xfrm6_tunnel_init_state,
+ .destructor = xfrm6_tunnel_destroy,
+ .input = xfrm6_tunnel_input,
+ .output = xfrm6_tunnel_output,
+};
+
+static struct xfrm6_tunnel xfrm6_tunnel_handler __read_mostly = {
+ .handler = xfrm6_tunnel_rcv,
+ .err_handler = xfrm6_tunnel_err,
+ .priority = 2,
+};
+
+static struct xfrm6_tunnel xfrm46_tunnel_handler __read_mostly = {
+ .handler = xfrm6_tunnel_rcv,
+ .err_handler = xfrm6_tunnel_err,
+ .priority = 2,
+};
+
+static int __net_init xfrm6_tunnel_net_init(struct net *net)
+{
+ struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
+ unsigned int i;
+
+ for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
+ INIT_HLIST_HEAD(&xfrm6_tn->spi_byaddr[i]);
+ for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
+ INIT_HLIST_HEAD(&xfrm6_tn->spi_byspi[i]);
+ xfrm6_tn->spi = 0;
+
+ return 0;
+}
+
+static void __net_exit xfrm6_tunnel_net_exit(struct net *net)
+{
+ struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
+ unsigned int i;
+
+ xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
+ xfrm_flush_gc();
+
+ for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
+ WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byaddr[i]));
+
+ for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
+ WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byspi[i]));
+}
+
+static struct pernet_operations xfrm6_tunnel_net_ops = {
+ .init = xfrm6_tunnel_net_init,
+ .exit = xfrm6_tunnel_net_exit,
+ .id = &xfrm6_tunnel_net_id,
+ .size = sizeof(struct xfrm6_tunnel_net),
+};
+
+static int __init xfrm6_tunnel_init(void)
+{
+ int rv;
+
+ xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
+ sizeof(struct xfrm6_tunnel_spi),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (!xfrm6_tunnel_spi_kmem)
+ return -ENOMEM;
+ rv = register_pernet_subsys(&xfrm6_tunnel_net_ops);
+ if (rv < 0)
+ goto out_pernet;
+ rv = xfrm_register_type(&xfrm6_tunnel_type, AF_INET6);
+ if (rv < 0)
+ goto out_type;
+ rv = xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6);
+ if (rv < 0)
+ goto out_xfrm6;
+ rv = xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET);
+ if (rv < 0)
+ goto out_xfrm46;
+ return 0;
+
+out_xfrm46:
+ xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
+out_xfrm6:
+ xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
+out_type:
+ unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
+out_pernet:
+ kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
+ return rv;
+}
+
+static void __exit xfrm6_tunnel_fini(void)
+{
+ xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
+ xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
+ xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
+ unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
+ kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
+}
+
+module_init(xfrm6_tunnel_init);
+module_exit(xfrm6_tunnel_fini);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);