v4.19.13 snapshot.
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
new file mode 100644
index 0000000..e948db2
--- /dev/null
+++ b/net/sctp/protocol.c
@@ -0,0 +1,1619 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ * Copyright (c) 2001 Nokia, Inc.
+ * Copyright (c) 2001 La Monte H.P. Yarroll
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * Initialization/cleanup for SCTP protocol support.
+ *
+ * This SCTP implementation 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, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation 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 GNU CC; see the file COPYING. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ * lksctp developers <linux-sctp@vger.kernel.org>
+ *
+ * Written or modified by:
+ * La Monte H.P. Yarroll <piggy@acm.org>
+ * Karl Knutson <karl@athena.chicago.il.us>
+ * Jon Grimm <jgrimm@us.ibm.com>
+ * Sridhar Samudrala <sri@us.ibm.com>
+ * Daisy Chang <daisyc@us.ibm.com>
+ * Ardelle Fan <ardelle.fan@intel.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/seq_file.h>
+#include <linux/bootmem.h>
+#include <linux/highmem.h>
+#include <linux/swap.h>
+#include <linux/slab.h>
+#include <net/net_namespace.h>
+#include <net/protocol.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/route.h>
+#include <net/sctp/sctp.h>
+#include <net/addrconf.h>
+#include <net/inet_common.h>
+#include <net/inet_ecn.h>
+
+#define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
+
+/* Global data structures. */
+struct sctp_globals sctp_globals __read_mostly;
+
+struct idr sctp_assocs_id;
+DEFINE_SPINLOCK(sctp_assocs_id_lock);
+
+static struct sctp_pf *sctp_pf_inet6_specific;
+static struct sctp_pf *sctp_pf_inet_specific;
+static struct sctp_af *sctp_af_v4_specific;
+static struct sctp_af *sctp_af_v6_specific;
+
+struct kmem_cache *sctp_chunk_cachep __read_mostly;
+struct kmem_cache *sctp_bucket_cachep __read_mostly;
+
+long sysctl_sctp_mem[3];
+int sysctl_sctp_rmem[3];
+int sysctl_sctp_wmem[3];
+
+/* Private helper to extract ipv4 address and stash them in
+ * the protocol structure.
+ */
+static void sctp_v4_copy_addrlist(struct list_head *addrlist,
+ struct net_device *dev)
+{
+ struct in_device *in_dev;
+ struct in_ifaddr *ifa;
+ struct sctp_sockaddr_entry *addr;
+
+ rcu_read_lock();
+ if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
+ rcu_read_unlock();
+ return;
+ }
+
+ for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
+ /* Add the address to the local list. */
+ addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
+ if (addr) {
+ addr->a.v4.sin_family = AF_INET;
+ addr->a.v4.sin_port = 0;
+ addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
+ addr->valid = 1;
+ INIT_LIST_HEAD(&addr->list);
+ list_add_tail(&addr->list, addrlist);
+ }
+ }
+
+ rcu_read_unlock();
+}
+
+/* Extract our IP addresses from the system and stash them in the
+ * protocol structure.
+ */
+static void sctp_get_local_addr_list(struct net *net)
+{
+ struct net_device *dev;
+ struct list_head *pos;
+ struct sctp_af *af;
+
+ rcu_read_lock();
+ for_each_netdev_rcu(net, dev) {
+ list_for_each(pos, &sctp_address_families) {
+ af = list_entry(pos, struct sctp_af, list);
+ af->copy_addrlist(&net->sctp.local_addr_list, dev);
+ }
+ }
+ rcu_read_unlock();
+}
+
+/* Free the existing local addresses. */
+static void sctp_free_local_addr_list(struct net *net)
+{
+ struct sctp_sockaddr_entry *addr;
+ struct list_head *pos, *temp;
+
+ list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
+ addr = list_entry(pos, struct sctp_sockaddr_entry, list);
+ list_del(pos);
+ kfree(addr);
+ }
+}
+
+/* Copy the local addresses which are valid for 'scope' into 'bp'. */
+int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
+ enum sctp_scope scope, gfp_t gfp, int copy_flags)
+{
+ struct sctp_sockaddr_entry *addr;
+ union sctp_addr laddr;
+ int error = 0;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
+ if (!addr->valid)
+ continue;
+ if (!sctp_in_scope(net, &addr->a, scope))
+ continue;
+
+ /* Now that the address is in scope, check to see if
+ * the address type is really supported by the local
+ * sock as well as the remote peer.
+ */
+ if (addr->a.sa.sa_family == AF_INET &&
+ !(copy_flags & SCTP_ADDR4_PEERSUPP))
+ continue;
+ if (addr->a.sa.sa_family == AF_INET6 &&
+ (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
+ !(copy_flags & SCTP_ADDR6_PEERSUPP)))
+ continue;
+
+ laddr = addr->a;
+ /* also works for setting ipv6 address port */
+ laddr.v4.sin_port = htons(bp->port);
+ if (sctp_bind_addr_state(bp, &laddr) != -1)
+ continue;
+
+ error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
+ SCTP_ADDR_SRC, GFP_ATOMIC);
+ if (error)
+ break;
+ }
+
+ rcu_read_unlock();
+ return error;
+}
+
+/* Copy over any ip options */
+static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk)
+{
+ struct inet_sock *newinet, *inet = inet_sk(sk);
+ struct ip_options_rcu *inet_opt, *newopt = NULL;
+
+ newinet = inet_sk(newsk);
+
+ rcu_read_lock();
+ inet_opt = rcu_dereference(inet->inet_opt);
+ if (inet_opt) {
+ newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
+ inet_opt->opt.optlen, GFP_ATOMIC);
+ if (newopt)
+ memcpy(newopt, inet_opt, sizeof(*inet_opt) +
+ inet_opt->opt.optlen);
+ else
+ pr_err("%s: Failed to copy ip options\n", __func__);
+ }
+ RCU_INIT_POINTER(newinet->inet_opt, newopt);
+ rcu_read_unlock();
+}
+
+/* Account for the IP options */
+static int sctp_v4_ip_options_len(struct sock *sk)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ip_options_rcu *inet_opt;
+ int len = 0;
+
+ rcu_read_lock();
+ inet_opt = rcu_dereference(inet->inet_opt);
+ if (inet_opt)
+ len = inet_opt->opt.optlen;
+
+ rcu_read_unlock();
+ return len;
+}
+
+/* Initialize a sctp_addr from in incoming skb. */
+static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
+ int is_saddr)
+{
+ /* Always called on head skb, so this is safe */
+ struct sctphdr *sh = sctp_hdr(skb);
+ struct sockaddr_in *sa = &addr->v4;
+
+ addr->v4.sin_family = AF_INET;
+
+ if (is_saddr) {
+ sa->sin_port = sh->source;
+ sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
+ } else {
+ sa->sin_port = sh->dest;
+ sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
+ }
+}
+
+/* Initialize an sctp_addr from a socket. */
+static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
+{
+ addr->v4.sin_family = AF_INET;
+ addr->v4.sin_port = 0;
+ addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
+}
+
+/* Initialize sk->sk_rcv_saddr from sctp_addr. */
+static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
+{
+ inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
+}
+
+/* Initialize sk->sk_daddr from sctp_addr. */
+static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
+{
+ inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
+}
+
+/* Initialize a sctp_addr from an address parameter. */
+static void sctp_v4_from_addr_param(union sctp_addr *addr,
+ union sctp_addr_param *param,
+ __be16 port, int iif)
+{
+ addr->v4.sin_family = AF_INET;
+ addr->v4.sin_port = port;
+ addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
+}
+
+/* Initialize an address parameter from a sctp_addr and return the length
+ * of the address parameter.
+ */
+static int sctp_v4_to_addr_param(const union sctp_addr *addr,
+ union sctp_addr_param *param)
+{
+ int length = sizeof(struct sctp_ipv4addr_param);
+
+ param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
+ param->v4.param_hdr.length = htons(length);
+ param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
+
+ return length;
+}
+
+/* Initialize a sctp_addr from a dst_entry. */
+static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
+ __be16 port)
+{
+ saddr->v4.sin_family = AF_INET;
+ saddr->v4.sin_port = port;
+ saddr->v4.sin_addr.s_addr = fl4->saddr;
+}
+
+/* Compare two addresses exactly. */
+static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
+ const union sctp_addr *addr2)
+{
+ if (addr1->sa.sa_family != addr2->sa.sa_family)
+ return 0;
+ if (addr1->v4.sin_port != addr2->v4.sin_port)
+ return 0;
+ if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
+ return 0;
+
+ return 1;
+}
+
+/* Initialize addr struct to INADDR_ANY. */
+static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
+{
+ addr->v4.sin_family = AF_INET;
+ addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
+ addr->v4.sin_port = port;
+}
+
+/* Is this a wildcard address? */
+static int sctp_v4_is_any(const union sctp_addr *addr)
+{
+ return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
+}
+
+/* This function checks if the address is a valid address to be used for
+ * SCTP binding.
+ *
+ * Output:
+ * Return 0 - If the address is a non-unicast or an illegal address.
+ * Return 1 - If the address is a unicast.
+ */
+static int sctp_v4_addr_valid(union sctp_addr *addr,
+ struct sctp_sock *sp,
+ const struct sk_buff *skb)
+{
+ /* IPv4 addresses not allowed */
+ if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
+ return 0;
+
+ /* Is this a non-unicast address or a unusable SCTP address? */
+ if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
+ return 0;
+
+ /* Is this a broadcast address? */
+ if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
+ return 0;
+
+ return 1;
+}
+
+/* Should this be available for binding? */
+static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
+{
+ struct net *net = sock_net(&sp->inet.sk);
+ int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
+
+
+ if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
+ ret != RTN_LOCAL &&
+ !sp->inet.freebind &&
+ !net->ipv4.sysctl_ip_nonlocal_bind)
+ return 0;
+
+ if (ipv6_only_sock(sctp_opt2sk(sp)))
+ return 0;
+
+ return 1;
+}
+
+/* Checking the loopback, private and other address scopes as defined in
+ * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
+ * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
+ *
+ * Level 0 - unusable SCTP addresses
+ * Level 1 - loopback address
+ * Level 2 - link-local addresses
+ * Level 3 - private addresses.
+ * Level 4 - global addresses
+ * For INIT and INIT-ACK address list, let L be the level of
+ * of requested destination address, sender and receiver
+ * SHOULD include all of its addresses with level greater
+ * than or equal to L.
+ *
+ * IPv4 scoping can be controlled through sysctl option
+ * net.sctp.addr_scope_policy
+ */
+static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
+{
+ enum sctp_scope retval;
+
+ /* Check for unusable SCTP addresses. */
+ if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
+ retval = SCTP_SCOPE_UNUSABLE;
+ } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
+ retval = SCTP_SCOPE_LOOPBACK;
+ } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
+ retval = SCTP_SCOPE_LINK;
+ } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
+ ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
+ ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
+ retval = SCTP_SCOPE_PRIVATE;
+ } else {
+ retval = SCTP_SCOPE_GLOBAL;
+ }
+
+ return retval;
+}
+
+/* Returns a valid dst cache entry for the given source and destination ip
+ * addresses. If an association is passed, trys to get a dst entry with a
+ * source address that matches an address in the bind address list.
+ */
+static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
+ struct flowi *fl, struct sock *sk)
+{
+ struct sctp_association *asoc = t->asoc;
+ struct rtable *rt;
+ struct flowi4 *fl4 = &fl->u.ip4;
+ struct sctp_bind_addr *bp;
+ struct sctp_sockaddr_entry *laddr;
+ struct dst_entry *dst = NULL;
+ union sctp_addr *daddr = &t->ipaddr;
+ union sctp_addr dst_saddr;
+ __u8 tos = inet_sk(sk)->tos;
+
+ if (t->dscp & SCTP_DSCP_SET_MASK)
+ tos = t->dscp & SCTP_DSCP_VAL_MASK;
+ memset(fl4, 0x0, sizeof(struct flowi4));
+ fl4->daddr = daddr->v4.sin_addr.s_addr;
+ fl4->fl4_dport = daddr->v4.sin_port;
+ fl4->flowi4_proto = IPPROTO_SCTP;
+ if (asoc) {
+ fl4->flowi4_tos = RT_CONN_FLAGS_TOS(asoc->base.sk, tos);
+ fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
+ fl4->fl4_sport = htons(asoc->base.bind_addr.port);
+ }
+ if (saddr) {
+ fl4->saddr = saddr->v4.sin_addr.s_addr;
+ fl4->fl4_sport = saddr->v4.sin_port;
+ }
+
+ pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
+ &fl4->saddr);
+
+ rt = ip_route_output_key(sock_net(sk), fl4);
+ if (!IS_ERR(rt))
+ dst = &rt->dst;
+
+ /* If there is no association or if a source address is passed, no
+ * more validation is required.
+ */
+ if (!asoc || saddr)
+ goto out;
+
+ bp = &asoc->base.bind_addr;
+
+ if (dst) {
+ /* Walk through the bind address list and look for a bind
+ * address that matches the source address of the returned dst.
+ */
+ sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
+ rcu_read_lock();
+ list_for_each_entry_rcu(laddr, &bp->address_list, list) {
+ if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
+ (laddr->state != SCTP_ADDR_SRC &&
+ !asoc->src_out_of_asoc_ok))
+ continue;
+ if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
+ goto out_unlock;
+ }
+ rcu_read_unlock();
+
+ /* None of the bound addresses match the source address of the
+ * dst. So release it.
+ */
+ dst_release(dst);
+ dst = NULL;
+ }
+
+ /* Walk through the bind address list and try to get a dst that
+ * matches a bind address as the source address.
+ */
+ rcu_read_lock();
+ list_for_each_entry_rcu(laddr, &bp->address_list, list) {
+ struct net_device *odev;
+
+ if (!laddr->valid)
+ continue;
+ if (laddr->state != SCTP_ADDR_SRC ||
+ AF_INET != laddr->a.sa.sa_family)
+ continue;
+
+ fl4->fl4_sport = laddr->a.v4.sin_port;
+ flowi4_update_output(fl4,
+ asoc->base.sk->sk_bound_dev_if,
+ RT_CONN_FLAGS_TOS(asoc->base.sk, tos),
+ daddr->v4.sin_addr.s_addr,
+ laddr->a.v4.sin_addr.s_addr);
+
+ rt = ip_route_output_key(sock_net(sk), fl4);
+ if (IS_ERR(rt))
+ continue;
+
+ /* Ensure the src address belongs to the output
+ * interface.
+ */
+ odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
+ false);
+ if (!odev || odev->ifindex != fl4->flowi4_oif) {
+ if (!dst)
+ dst = &rt->dst;
+ else
+ dst_release(&rt->dst);
+ continue;
+ }
+
+ dst_release(dst);
+ dst = &rt->dst;
+ break;
+ }
+
+out_unlock:
+ rcu_read_unlock();
+out:
+ t->dst = dst;
+ if (dst)
+ pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
+ &fl4->daddr, &fl4->saddr);
+ else
+ pr_debug("no route\n");
+}
+
+/* For v4, the source address is cached in the route entry(dst). So no need
+ * to cache it separately and hence this is an empty routine.
+ */
+static void sctp_v4_get_saddr(struct sctp_sock *sk,
+ struct sctp_transport *t,
+ struct flowi *fl)
+{
+ union sctp_addr *saddr = &t->saddr;
+ struct rtable *rt = (struct rtable *)t->dst;
+
+ if (rt) {
+ saddr->v4.sin_family = AF_INET;
+ saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
+ }
+}
+
+/* What interface did this skb arrive on? */
+static int sctp_v4_skb_iif(const struct sk_buff *skb)
+{
+ return inet_iif(skb);
+}
+
+/* Was this packet marked by Explicit Congestion Notification? */
+static int sctp_v4_is_ce(const struct sk_buff *skb)
+{
+ return INET_ECN_is_ce(ip_hdr(skb)->tos);
+}
+
+/* Create and initialize a new sk for the socket returned by accept(). */
+static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
+ struct sctp_association *asoc,
+ bool kern)
+{
+ struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
+ sk->sk_prot, kern);
+ struct inet_sock *newinet;
+
+ if (!newsk)
+ goto out;
+
+ sock_init_data(NULL, newsk);
+
+ sctp_copy_sock(newsk, sk, asoc);
+ sock_reset_flag(newsk, SOCK_ZAPPED);
+
+ sctp_v4_copy_ip_options(sk, newsk);
+
+ newinet = inet_sk(newsk);
+
+ newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
+
+ sk_refcnt_debug_inc(newsk);
+
+ if (newsk->sk_prot->init(newsk)) {
+ sk_common_release(newsk);
+ newsk = NULL;
+ }
+
+out:
+ return newsk;
+}
+
+static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
+{
+ /* No address mapping for V4 sockets */
+ return sizeof(struct sockaddr_in);
+}
+
+/* Dump the v4 addr to the seq file. */
+static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
+{
+ seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
+}
+
+static void sctp_v4_ecn_capable(struct sock *sk)
+{
+ INET_ECN_xmit(sk);
+}
+
+static void sctp_addr_wq_timeout_handler(struct timer_list *t)
+{
+ struct net *net = from_timer(net, t, sctp.addr_wq_timer);
+ struct sctp_sockaddr_entry *addrw, *temp;
+ struct sctp_sock *sp;
+
+ spin_lock_bh(&net->sctp.addr_wq_lock);
+
+ list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
+ pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
+ "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
+ addrw->state, addrw);
+
+#if IS_ENABLED(CONFIG_IPV6)
+ /* Now we send an ASCONF for each association */
+ /* Note. we currently don't handle link local IPv6 addressees */
+ if (addrw->a.sa.sa_family == AF_INET6) {
+ struct in6_addr *in6;
+
+ if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
+ IPV6_ADDR_LINKLOCAL)
+ goto free_next;
+
+ in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
+ if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
+ addrw->state == SCTP_ADDR_NEW) {
+ unsigned long timeo_val;
+
+ pr_debug("%s: this is on DAD, trying %d sec "
+ "later\n", __func__,
+ SCTP_ADDRESS_TICK_DELAY);
+
+ timeo_val = jiffies;
+ timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
+ mod_timer(&net->sctp.addr_wq_timer, timeo_val);
+ break;
+ }
+ }
+#endif
+ list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
+ struct sock *sk;
+
+ sk = sctp_opt2sk(sp);
+ /* ignore bound-specific endpoints */
+ if (!sctp_is_ep_boundall(sk))
+ continue;
+ bh_lock_sock(sk);
+ if (sctp_asconf_mgmt(sp, addrw) < 0)
+ pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
+ bh_unlock_sock(sk);
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+free_next:
+#endif
+ list_del(&addrw->list);
+ kfree(addrw);
+ }
+ spin_unlock_bh(&net->sctp.addr_wq_lock);
+}
+
+static void sctp_free_addr_wq(struct net *net)
+{
+ struct sctp_sockaddr_entry *addrw;
+ struct sctp_sockaddr_entry *temp;
+
+ spin_lock_bh(&net->sctp.addr_wq_lock);
+ del_timer(&net->sctp.addr_wq_timer);
+ list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
+ list_del(&addrw->list);
+ kfree(addrw);
+ }
+ spin_unlock_bh(&net->sctp.addr_wq_lock);
+}
+
+/* lookup the entry for the same address in the addr_waitq
+ * sctp_addr_wq MUST be locked
+ */
+static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
+ struct sctp_sockaddr_entry *addr)
+{
+ struct sctp_sockaddr_entry *addrw;
+
+ list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
+ if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
+ continue;
+ if (addrw->a.sa.sa_family == AF_INET) {
+ if (addrw->a.v4.sin_addr.s_addr ==
+ addr->a.v4.sin_addr.s_addr)
+ return addrw;
+ } else if (addrw->a.sa.sa_family == AF_INET6) {
+ if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
+ &addr->a.v6.sin6_addr))
+ return addrw;
+ }
+ }
+ return NULL;
+}
+
+void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
+{
+ struct sctp_sockaddr_entry *addrw;
+ unsigned long timeo_val;
+
+ /* first, we check if an opposite message already exist in the queue.
+ * If we found such message, it is removed.
+ * This operation is a bit stupid, but the DHCP client attaches the
+ * new address after a couple of addition and deletion of that address
+ */
+
+ spin_lock_bh(&net->sctp.addr_wq_lock);
+ /* Offsets existing events in addr_wq */
+ addrw = sctp_addr_wq_lookup(net, addr);
+ if (addrw) {
+ if (addrw->state != cmd) {
+ pr_debug("%s: offsets existing entry for %d, addr:%pISc "
+ "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
+ &net->sctp.addr_waitq);
+
+ list_del(&addrw->list);
+ kfree(addrw);
+ }
+ spin_unlock_bh(&net->sctp.addr_wq_lock);
+ return;
+ }
+
+ /* OK, we have to add the new address to the wait queue */
+ addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
+ if (addrw == NULL) {
+ spin_unlock_bh(&net->sctp.addr_wq_lock);
+ return;
+ }
+ addrw->state = cmd;
+ list_add_tail(&addrw->list, &net->sctp.addr_waitq);
+
+ pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
+ __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
+
+ if (!timer_pending(&net->sctp.addr_wq_timer)) {
+ timeo_val = jiffies;
+ timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
+ mod_timer(&net->sctp.addr_wq_timer, timeo_val);
+ }
+ spin_unlock_bh(&net->sctp.addr_wq_lock);
+}
+
+/* Event handler for inet address addition/deletion events.
+ * The sctp_local_addr_list needs to be protocted by a spin lock since
+ * multiple notifiers (say IPv4 and IPv6) may be running at the same
+ * time and thus corrupt the list.
+ * The reader side is protected with RCU.
+ */
+static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
+ void *ptr)
+{
+ struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
+ struct sctp_sockaddr_entry *addr = NULL;
+ struct sctp_sockaddr_entry *temp;
+ struct net *net = dev_net(ifa->ifa_dev->dev);
+ int found = 0;
+
+ switch (ev) {
+ case NETDEV_UP:
+ addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
+ if (addr) {
+ addr->a.v4.sin_family = AF_INET;
+ addr->a.v4.sin_port = 0;
+ addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
+ addr->valid = 1;
+ spin_lock_bh(&net->sctp.local_addr_lock);
+ list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
+ sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
+ spin_unlock_bh(&net->sctp.local_addr_lock);
+ }
+ break;
+ case NETDEV_DOWN:
+ spin_lock_bh(&net->sctp.local_addr_lock);
+ list_for_each_entry_safe(addr, temp,
+ &net->sctp.local_addr_list, list) {
+ if (addr->a.sa.sa_family == AF_INET &&
+ addr->a.v4.sin_addr.s_addr ==
+ ifa->ifa_local) {
+ sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
+ found = 1;
+ addr->valid = 0;
+ list_del_rcu(&addr->list);
+ break;
+ }
+ }
+ spin_unlock_bh(&net->sctp.local_addr_lock);
+ if (found)
+ kfree_rcu(addr, rcu);
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+/*
+ * Initialize the control inode/socket with a control endpoint data
+ * structure. This endpoint is reserved exclusively for the OOTB processing.
+ */
+static int sctp_ctl_sock_init(struct net *net)
+{
+ int err;
+ sa_family_t family = PF_INET;
+
+ if (sctp_get_pf_specific(PF_INET6))
+ family = PF_INET6;
+
+ err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
+ SOCK_SEQPACKET, IPPROTO_SCTP, net);
+
+ /* If IPv6 socket could not be created, try the IPv4 socket */
+ if (err < 0 && family == PF_INET6)
+ err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
+ SOCK_SEQPACKET, IPPROTO_SCTP,
+ net);
+
+ if (err < 0) {
+ pr_err("Failed to create the SCTP control socket\n");
+ return err;
+ }
+ return 0;
+}
+
+/* Register address family specific functions. */
+int sctp_register_af(struct sctp_af *af)
+{
+ switch (af->sa_family) {
+ case AF_INET:
+ if (sctp_af_v4_specific)
+ return 0;
+ sctp_af_v4_specific = af;
+ break;
+ case AF_INET6:
+ if (sctp_af_v6_specific)
+ return 0;
+ sctp_af_v6_specific = af;
+ break;
+ default:
+ return 0;
+ }
+
+ INIT_LIST_HEAD(&af->list);
+ list_add_tail(&af->list, &sctp_address_families);
+ return 1;
+}
+
+/* Get the table of functions for manipulating a particular address
+ * family.
+ */
+struct sctp_af *sctp_get_af_specific(sa_family_t family)
+{
+ switch (family) {
+ case AF_INET:
+ return sctp_af_v4_specific;
+ case AF_INET6:
+ return sctp_af_v6_specific;
+ default:
+ return NULL;
+ }
+}
+
+/* Common code to initialize a AF_INET msg_name. */
+static void sctp_inet_msgname(char *msgname, int *addr_len)
+{
+ struct sockaddr_in *sin;
+
+ sin = (struct sockaddr_in *)msgname;
+ *addr_len = sizeof(struct sockaddr_in);
+ sin->sin_family = AF_INET;
+ memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+}
+
+/* Copy the primary address of the peer primary address as the msg_name. */
+static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
+ int *addr_len)
+{
+ struct sockaddr_in *sin, *sinfrom;
+
+ if (msgname) {
+ struct sctp_association *asoc;
+
+ asoc = event->asoc;
+ sctp_inet_msgname(msgname, addr_len);
+ sin = (struct sockaddr_in *)msgname;
+ sinfrom = &asoc->peer.primary_addr.v4;
+ sin->sin_port = htons(asoc->peer.port);
+ sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
+ }
+}
+
+/* Initialize and copy out a msgname from an inbound skb. */
+static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
+{
+ if (msgname) {
+ struct sctphdr *sh = sctp_hdr(skb);
+ struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
+
+ sctp_inet_msgname(msgname, len);
+ sin->sin_port = sh->source;
+ sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
+ }
+}
+
+/* Do we support this AF? */
+static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
+{
+ /* PF_INET only supports AF_INET addresses. */
+ return AF_INET == family;
+}
+
+/* Address matching with wildcards allowed. */
+static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
+ const union sctp_addr *addr2,
+ struct sctp_sock *opt)
+{
+ /* PF_INET only supports AF_INET addresses. */
+ if (addr1->sa.sa_family != addr2->sa.sa_family)
+ return 0;
+ if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
+ htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
+ return 1;
+ if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
+ return 1;
+
+ return 0;
+}
+
+/* Verify that provided sockaddr looks bindable. Common verification has
+ * already been taken care of.
+ */
+static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
+{
+ return sctp_v4_available(addr, opt);
+}
+
+/* Verify that sockaddr looks sendable. Common verification has already
+ * been taken care of.
+ */
+static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
+{
+ return 1;
+}
+
+/* Fill in Supported Address Type information for INIT and INIT-ACK
+ * chunks. Returns number of addresses supported.
+ */
+static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
+ __be16 *types)
+{
+ types[0] = SCTP_PARAM_IPV4_ADDRESS;
+ return 1;
+}
+
+/* Wrapper routine that calls the ip transmit routine. */
+static inline int sctp_v4_xmit(struct sk_buff *skb,
+ struct sctp_transport *transport)
+{
+ struct inet_sock *inet = inet_sk(skb->sk);
+ __u8 dscp = inet->tos;
+
+ pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
+ skb->len, &transport->fl.u.ip4.saddr,
+ &transport->fl.u.ip4.daddr);
+
+ if (transport->dscp & SCTP_DSCP_SET_MASK)
+ dscp = transport->dscp & SCTP_DSCP_VAL_MASK;
+
+ inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
+ IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
+
+ SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
+
+ return __ip_queue_xmit(&inet->sk, skb, &transport->fl, dscp);
+}
+
+static struct sctp_af sctp_af_inet;
+
+static struct sctp_pf sctp_pf_inet = {
+ .event_msgname = sctp_inet_event_msgname,
+ .skb_msgname = sctp_inet_skb_msgname,
+ .af_supported = sctp_inet_af_supported,
+ .cmp_addr = sctp_inet_cmp_addr,
+ .bind_verify = sctp_inet_bind_verify,
+ .send_verify = sctp_inet_send_verify,
+ .supported_addrs = sctp_inet_supported_addrs,
+ .create_accept_sk = sctp_v4_create_accept_sk,
+ .addr_to_user = sctp_v4_addr_to_user,
+ .to_sk_saddr = sctp_v4_to_sk_saddr,
+ .to_sk_daddr = sctp_v4_to_sk_daddr,
+ .copy_ip_options = sctp_v4_copy_ip_options,
+ .af = &sctp_af_inet
+};
+
+/* Notifier for inetaddr addition/deletion events. */
+static struct notifier_block sctp_inetaddr_notifier = {
+ .notifier_call = sctp_inetaddr_event,
+};
+
+/* Socket operations. */
+static const struct proto_ops inet_seqpacket_ops = {
+ .family = PF_INET,
+ .owner = THIS_MODULE,
+ .release = inet_release, /* Needs to be wrapped... */
+ .bind = inet_bind,
+ .connect = sctp_inet_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = inet_accept,
+ .getname = inet_getname, /* Semantics are different. */
+ .poll = sctp_poll,
+ .ioctl = inet_ioctl,
+ .listen = sctp_inet_listen,
+ .shutdown = inet_shutdown, /* Looks harmless. */
+ .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
+ .getsockopt = sock_common_getsockopt,
+ .sendmsg = inet_sendmsg,
+ .recvmsg = inet_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+};
+
+/* Registration with AF_INET family. */
+static struct inet_protosw sctp_seqpacket_protosw = {
+ .type = SOCK_SEQPACKET,
+ .protocol = IPPROTO_SCTP,
+ .prot = &sctp_prot,
+ .ops = &inet_seqpacket_ops,
+ .flags = SCTP_PROTOSW_FLAG
+};
+static struct inet_protosw sctp_stream_protosw = {
+ .type = SOCK_STREAM,
+ .protocol = IPPROTO_SCTP,
+ .prot = &sctp_prot,
+ .ops = &inet_seqpacket_ops,
+ .flags = SCTP_PROTOSW_FLAG
+};
+
+/* Register with IP layer. */
+static const struct net_protocol sctp_protocol = {
+ .handler = sctp_rcv,
+ .err_handler = sctp_v4_err,
+ .no_policy = 1,
+ .netns_ok = 1,
+ .icmp_strict_tag_validation = 1,
+};
+
+/* IPv4 address related functions. */
+static struct sctp_af sctp_af_inet = {
+ .sa_family = AF_INET,
+ .sctp_xmit = sctp_v4_xmit,
+ .setsockopt = ip_setsockopt,
+ .getsockopt = ip_getsockopt,
+ .get_dst = sctp_v4_get_dst,
+ .get_saddr = sctp_v4_get_saddr,
+ .copy_addrlist = sctp_v4_copy_addrlist,
+ .from_skb = sctp_v4_from_skb,
+ .from_sk = sctp_v4_from_sk,
+ .from_addr_param = sctp_v4_from_addr_param,
+ .to_addr_param = sctp_v4_to_addr_param,
+ .cmp_addr = sctp_v4_cmp_addr,
+ .addr_valid = sctp_v4_addr_valid,
+ .inaddr_any = sctp_v4_inaddr_any,
+ .is_any = sctp_v4_is_any,
+ .available = sctp_v4_available,
+ .scope = sctp_v4_scope,
+ .skb_iif = sctp_v4_skb_iif,
+ .is_ce = sctp_v4_is_ce,
+ .seq_dump_addr = sctp_v4_seq_dump_addr,
+ .ecn_capable = sctp_v4_ecn_capable,
+ .net_header_len = sizeof(struct iphdr),
+ .sockaddr_len = sizeof(struct sockaddr_in),
+ .ip_options_len = sctp_v4_ip_options_len,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_ip_setsockopt,
+ .compat_getsockopt = compat_ip_getsockopt,
+#endif
+};
+
+struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
+{
+ switch (family) {
+ case PF_INET:
+ return sctp_pf_inet_specific;
+ case PF_INET6:
+ return sctp_pf_inet6_specific;
+ default:
+ return NULL;
+ }
+}
+
+/* Register the PF specific function table. */
+int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
+{
+ switch (family) {
+ case PF_INET:
+ if (sctp_pf_inet_specific)
+ return 0;
+ sctp_pf_inet_specific = pf;
+ break;
+ case PF_INET6:
+ if (sctp_pf_inet6_specific)
+ return 0;
+ sctp_pf_inet6_specific = pf;
+ break;
+ default:
+ return 0;
+ }
+ return 1;
+}
+
+static inline int init_sctp_mibs(struct net *net)
+{
+ net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
+ if (!net->sctp.sctp_statistics)
+ return -ENOMEM;
+ return 0;
+}
+
+static inline void cleanup_sctp_mibs(struct net *net)
+{
+ free_percpu(net->sctp.sctp_statistics);
+}
+
+static void sctp_v4_pf_init(void)
+{
+ /* Initialize the SCTP specific PF functions. */
+ sctp_register_pf(&sctp_pf_inet, PF_INET);
+ sctp_register_af(&sctp_af_inet);
+}
+
+static void sctp_v4_pf_exit(void)
+{
+ list_del(&sctp_af_inet.list);
+}
+
+static int sctp_v4_protosw_init(void)
+{
+ int rc;
+
+ rc = proto_register(&sctp_prot, 1);
+ if (rc)
+ return rc;
+
+ /* Register SCTP(UDP and TCP style) with socket layer. */
+ inet_register_protosw(&sctp_seqpacket_protosw);
+ inet_register_protosw(&sctp_stream_protosw);
+
+ return 0;
+}
+
+static void sctp_v4_protosw_exit(void)
+{
+ inet_unregister_protosw(&sctp_stream_protosw);
+ inet_unregister_protosw(&sctp_seqpacket_protosw);
+ proto_unregister(&sctp_prot);
+}
+
+static int sctp_v4_add_protocol(void)
+{
+ /* Register notifier for inet address additions/deletions. */
+ register_inetaddr_notifier(&sctp_inetaddr_notifier);
+
+ /* Register SCTP with inet layer. */
+ if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
+ return -EAGAIN;
+
+ return 0;
+}
+
+static void sctp_v4_del_protocol(void)
+{
+ inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
+ unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
+}
+
+static int __net_init sctp_defaults_init(struct net *net)
+{
+ int status;
+
+ /*
+ * 14. Suggested SCTP Protocol Parameter Values
+ */
+ /* The following protocol parameters are RECOMMENDED: */
+ /* RTO.Initial - 3 seconds */
+ net->sctp.rto_initial = SCTP_RTO_INITIAL;
+ /* RTO.Min - 1 second */
+ net->sctp.rto_min = SCTP_RTO_MIN;
+ /* RTO.Max - 60 seconds */
+ net->sctp.rto_max = SCTP_RTO_MAX;
+ /* RTO.Alpha - 1/8 */
+ net->sctp.rto_alpha = SCTP_RTO_ALPHA;
+ /* RTO.Beta - 1/4 */
+ net->sctp.rto_beta = SCTP_RTO_BETA;
+
+ /* Valid.Cookie.Life - 60 seconds */
+ net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
+
+ /* Whether Cookie Preservative is enabled(1) or not(0) */
+ net->sctp.cookie_preserve_enable = 1;
+
+ /* Default sctp sockets to use md5 as their hmac alg */
+#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
+ net->sctp.sctp_hmac_alg = "md5";
+#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
+ net->sctp.sctp_hmac_alg = "sha1";
+#else
+ net->sctp.sctp_hmac_alg = NULL;
+#endif
+
+ /* Max.Burst - 4 */
+ net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
+
+ /* Enable pf state by default */
+ net->sctp.pf_enable = 1;
+
+ /* Association.Max.Retrans - 10 attempts
+ * Path.Max.Retrans - 5 attempts (per destination address)
+ * Max.Init.Retransmits - 8 attempts
+ */
+ net->sctp.max_retrans_association = 10;
+ net->sctp.max_retrans_path = 5;
+ net->sctp.max_retrans_init = 8;
+
+ /* Sendbuffer growth - do per-socket accounting */
+ net->sctp.sndbuf_policy = 0;
+
+ /* Rcvbuffer growth - do per-socket accounting */
+ net->sctp.rcvbuf_policy = 0;
+
+ /* HB.interval - 30 seconds */
+ net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
+
+ /* delayed SACK timeout */
+ net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
+
+ /* Disable ADDIP by default. */
+ net->sctp.addip_enable = 0;
+ net->sctp.addip_noauth = 0;
+ net->sctp.default_auto_asconf = 0;
+
+ /* Enable PR-SCTP by default. */
+ net->sctp.prsctp_enable = 1;
+
+ /* Disable RECONF by default. */
+ net->sctp.reconf_enable = 0;
+
+ /* Disable AUTH by default. */
+ net->sctp.auth_enable = 0;
+
+ /* Set SCOPE policy to enabled */
+ net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
+
+ /* Set the default rwnd update threshold */
+ net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
+
+ /* Initialize maximum autoclose timeout. */
+ net->sctp.max_autoclose = INT_MAX / HZ;
+
+ status = sctp_sysctl_net_register(net);
+ if (status)
+ goto err_sysctl_register;
+
+ /* Allocate and initialise sctp mibs. */
+ status = init_sctp_mibs(net);
+ if (status)
+ goto err_init_mibs;
+
+#ifdef CONFIG_PROC_FS
+ /* Initialize proc fs directory. */
+ status = sctp_proc_init(net);
+ if (status)
+ goto err_init_proc;
+#endif
+
+ sctp_dbg_objcnt_init(net);
+
+ /* Initialize the local address list. */
+ INIT_LIST_HEAD(&net->sctp.local_addr_list);
+ spin_lock_init(&net->sctp.local_addr_lock);
+ sctp_get_local_addr_list(net);
+
+ /* Initialize the address event list */
+ INIT_LIST_HEAD(&net->sctp.addr_waitq);
+ INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
+ spin_lock_init(&net->sctp.addr_wq_lock);
+ net->sctp.addr_wq_timer.expires = 0;
+ timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
+
+ return 0;
+
+#ifdef CONFIG_PROC_FS
+err_init_proc:
+ cleanup_sctp_mibs(net);
+#endif
+err_init_mibs:
+ sctp_sysctl_net_unregister(net);
+err_sysctl_register:
+ return status;
+}
+
+static void __net_exit sctp_defaults_exit(struct net *net)
+{
+ /* Free the local address list */
+ sctp_free_addr_wq(net);
+ sctp_free_local_addr_list(net);
+
+#ifdef CONFIG_PROC_FS
+ remove_proc_subtree("sctp", net->proc_net);
+ net->sctp.proc_net_sctp = NULL;
+#endif
+ cleanup_sctp_mibs(net);
+ sctp_sysctl_net_unregister(net);
+}
+
+static struct pernet_operations sctp_defaults_ops = {
+ .init = sctp_defaults_init,
+ .exit = sctp_defaults_exit,
+};
+
+static int __net_init sctp_ctrlsock_init(struct net *net)
+{
+ int status;
+
+ /* Initialize the control inode/socket for handling OOTB packets. */
+ status = sctp_ctl_sock_init(net);
+ if (status)
+ pr_err("Failed to initialize the SCTP control sock\n");
+
+ return status;
+}
+
+static void __net_init sctp_ctrlsock_exit(struct net *net)
+{
+ /* Free the control endpoint. */
+ inet_ctl_sock_destroy(net->sctp.ctl_sock);
+}
+
+static struct pernet_operations sctp_ctrlsock_ops = {
+ .init = sctp_ctrlsock_init,
+ .exit = sctp_ctrlsock_exit,
+};
+
+/* Initialize the universe into something sensible. */
+static __init int sctp_init(void)
+{
+ int i;
+ int status = -EINVAL;
+ unsigned long goal;
+ unsigned long limit;
+ int max_share;
+ int order;
+ int num_entries;
+ int max_entry_order;
+
+ sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
+
+ /* Allocate bind_bucket and chunk caches. */
+ status = -ENOBUFS;
+ sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
+ sizeof(struct sctp_bind_bucket),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (!sctp_bucket_cachep)
+ goto out;
+
+ sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
+ sizeof(struct sctp_chunk),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (!sctp_chunk_cachep)
+ goto err_chunk_cachep;
+
+ status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
+ if (status)
+ goto err_percpu_counter_init;
+
+ /* Implementation specific variables. */
+
+ /* Initialize default stream count setup information. */
+ sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
+ sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
+
+ /* Initialize handle used for association ids. */
+ idr_init(&sctp_assocs_id);
+
+ limit = nr_free_buffer_pages() / 8;
+ limit = max(limit, 128UL);
+ sysctl_sctp_mem[0] = limit / 4 * 3;
+ sysctl_sctp_mem[1] = limit;
+ sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
+
+ /* Set per-socket limits to no more than 1/128 the pressure threshold*/
+ limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
+ max_share = min(4UL*1024*1024, limit);
+
+ sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
+ sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
+ sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
+
+ sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
+ sysctl_sctp_wmem[1] = 16*1024;
+ sysctl_sctp_wmem[2] = max(64*1024, max_share);
+
+ /* Size and allocate the association hash table.
+ * The methodology is similar to that of the tcp hash tables.
+ * Though not identical. Start by getting a goal size
+ */
+ if (totalram_pages >= (128 * 1024))
+ goal = totalram_pages >> (22 - PAGE_SHIFT);
+ else
+ goal = totalram_pages >> (24 - PAGE_SHIFT);
+
+ /* Then compute the page order for said goal */
+ order = get_order(goal);
+
+ /* Now compute the required page order for the maximum sized table we
+ * want to create
+ */
+ max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
+ sizeof(struct sctp_bind_hashbucket));
+
+ /* Limit the page order by that maximum hash table size */
+ order = min(order, max_entry_order);
+
+ /* Allocate and initialize the endpoint hash table. */
+ sctp_ep_hashsize = 64;
+ sctp_ep_hashtable =
+ kmalloc_array(64, sizeof(struct sctp_hashbucket), GFP_KERNEL);
+ if (!sctp_ep_hashtable) {
+ pr_err("Failed endpoint_hash alloc\n");
+ status = -ENOMEM;
+ goto err_ehash_alloc;
+ }
+ for (i = 0; i < sctp_ep_hashsize; i++) {
+ rwlock_init(&sctp_ep_hashtable[i].lock);
+ INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
+ }
+
+ /* Allocate and initialize the SCTP port hash table.
+ * Note that order is initalized to start at the max sized
+ * table we want to support. If we can't get that many pages
+ * reduce the order and try again
+ */
+ do {
+ sctp_port_hashtable = (struct sctp_bind_hashbucket *)
+ __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
+ } while (!sctp_port_hashtable && --order > 0);
+
+ if (!sctp_port_hashtable) {
+ pr_err("Failed bind hash alloc\n");
+ status = -ENOMEM;
+ goto err_bhash_alloc;
+ }
+
+ /* Now compute the number of entries that will fit in the
+ * port hash space we allocated
+ */
+ num_entries = (1UL << order) * PAGE_SIZE /
+ sizeof(struct sctp_bind_hashbucket);
+
+ /* And finish by rounding it down to the nearest power of two
+ * this wastes some memory of course, but its needed because
+ * the hash function operates based on the assumption that
+ * that the number of entries is a power of two
+ */
+ sctp_port_hashsize = rounddown_pow_of_two(num_entries);
+
+ for (i = 0; i < sctp_port_hashsize; i++) {
+ spin_lock_init(&sctp_port_hashtable[i].lock);
+ INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
+ }
+
+ status = sctp_transport_hashtable_init();
+ if (status)
+ goto err_thash_alloc;
+
+ pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
+ num_entries);
+
+ sctp_sysctl_register();
+
+ INIT_LIST_HEAD(&sctp_address_families);
+ sctp_v4_pf_init();
+ sctp_v6_pf_init();
+ sctp_sched_ops_init();
+
+ status = register_pernet_subsys(&sctp_defaults_ops);
+ if (status)
+ goto err_register_defaults;
+
+ status = sctp_v4_protosw_init();
+ if (status)
+ goto err_protosw_init;
+
+ status = sctp_v6_protosw_init();
+ if (status)
+ goto err_v6_protosw_init;
+
+ status = register_pernet_subsys(&sctp_ctrlsock_ops);
+ if (status)
+ goto err_register_ctrlsock;
+
+ status = sctp_v4_add_protocol();
+ if (status)
+ goto err_add_protocol;
+
+ /* Register SCTP with inet6 layer. */
+ status = sctp_v6_add_protocol();
+ if (status)
+ goto err_v6_add_protocol;
+
+ if (sctp_offload_init() < 0)
+ pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
+
+out:
+ return status;
+err_v6_add_protocol:
+ sctp_v4_del_protocol();
+err_add_protocol:
+ unregister_pernet_subsys(&sctp_ctrlsock_ops);
+err_register_ctrlsock:
+ sctp_v6_protosw_exit();
+err_v6_protosw_init:
+ sctp_v4_protosw_exit();
+err_protosw_init:
+ unregister_pernet_subsys(&sctp_defaults_ops);
+err_register_defaults:
+ sctp_v4_pf_exit();
+ sctp_v6_pf_exit();
+ sctp_sysctl_unregister();
+ free_pages((unsigned long)sctp_port_hashtable,
+ get_order(sctp_port_hashsize *
+ sizeof(struct sctp_bind_hashbucket)));
+err_bhash_alloc:
+ sctp_transport_hashtable_destroy();
+err_thash_alloc:
+ kfree(sctp_ep_hashtable);
+err_ehash_alloc:
+ percpu_counter_destroy(&sctp_sockets_allocated);
+err_percpu_counter_init:
+ kmem_cache_destroy(sctp_chunk_cachep);
+err_chunk_cachep:
+ kmem_cache_destroy(sctp_bucket_cachep);
+ goto out;
+}
+
+/* Exit handler for the SCTP protocol. */
+static __exit void sctp_exit(void)
+{
+ /* BUG. This should probably do something useful like clean
+ * up all the remaining associations and all that memory.
+ */
+
+ /* Unregister with inet6/inet layers. */
+ sctp_v6_del_protocol();
+ sctp_v4_del_protocol();
+
+ unregister_pernet_subsys(&sctp_ctrlsock_ops);
+
+ /* Free protosw registrations */
+ sctp_v6_protosw_exit();
+ sctp_v4_protosw_exit();
+
+ unregister_pernet_subsys(&sctp_defaults_ops);
+
+ /* Unregister with socket layer. */
+ sctp_v6_pf_exit();
+ sctp_v4_pf_exit();
+
+ sctp_sysctl_unregister();
+
+ free_pages((unsigned long)sctp_port_hashtable,
+ get_order(sctp_port_hashsize *
+ sizeof(struct sctp_bind_hashbucket)));
+ kfree(sctp_ep_hashtable);
+ sctp_transport_hashtable_destroy();
+
+ percpu_counter_destroy(&sctp_sockets_allocated);
+
+ rcu_barrier(); /* Wait for completion of call_rcu()'s */
+
+ kmem_cache_destroy(sctp_chunk_cachep);
+ kmem_cache_destroy(sctp_bucket_cachep);
+}
+
+module_init(sctp_init);
+module_exit(sctp_exit);
+
+/*
+ * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
+ */
+MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
+MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
+MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
+MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
+module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
+MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
+MODULE_LICENSE("GPL");