v4.19.13 snapshot.
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
new file mode 100644
index 0000000..ea4bd8a
--- /dev/null
+++ b/net/ipv4/devinet.c
@@ -0,0 +1,2529 @@
+/*
+ * NET3 IP device support routines.
+ *
+ * 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.
+ *
+ * Derived from the IP parts of dev.c 1.0.19
+ * Authors: Ross Biro
+ * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ * Mark Evans, <evansmp@uhura.aston.ac.uk>
+ *
+ * Additional Authors:
+ * Alan Cox, <gw4pts@gw4pts.ampr.org>
+ * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ * Changes:
+ * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
+ * lists.
+ * Cyrus Durgin: updated for kmod
+ * Matthias Andree: in devinet_ioctl, compare label and
+ * address (4.4BSD alias style support),
+ * fall back to comparing just the label
+ * if no match found.
+ */
+
+
+#include <linux/uaccess.h>
+#include <linux/bitops.h>
+#include <linux/capability.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched/signal.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/if_addr.h>
+#include <linux/if_ether.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/notifier.h>
+#include <linux/inetdevice.h>
+#include <linux/igmp.h>
+#include <linux/slab.h>
+#include <linux/hash.h>
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+#include <linux/kmod.h>
+#include <linux/netconf.h>
+
+#include <net/arp.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include <net/ip_fib.h>
+#include <net/rtnetlink.h>
+#include <net/net_namespace.h>
+#include <net/addrconf.h>
+
+static struct ipv4_devconf ipv4_devconf = {
+ .data = {
+ [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
+ [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
+ [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
+ [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
+ [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
+ [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
+ },
+};
+
+static struct ipv4_devconf ipv4_devconf_dflt = {
+ .data = {
+ [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
+ [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
+ [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
+ [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
+ [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
+ [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
+ [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
+ },
+};
+
+#define IPV4_DEVCONF_DFLT(net, attr) \
+ IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
+
+static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
+ [IFA_LOCAL] = { .type = NLA_U32 },
+ [IFA_ADDRESS] = { .type = NLA_U32 },
+ [IFA_BROADCAST] = { .type = NLA_U32 },
+ [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
+ [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
+ [IFA_FLAGS] = { .type = NLA_U32 },
+ [IFA_RT_PRIORITY] = { .type = NLA_U32 },
+};
+
+#define IN4_ADDR_HSIZE_SHIFT 8
+#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
+
+static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
+
+static u32 inet_addr_hash(const struct net *net, __be32 addr)
+{
+ u32 val = (__force u32) addr ^ net_hash_mix(net);
+
+ return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
+}
+
+static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
+{
+ u32 hash = inet_addr_hash(net, ifa->ifa_local);
+
+ ASSERT_RTNL();
+ hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
+}
+
+static void inet_hash_remove(struct in_ifaddr *ifa)
+{
+ ASSERT_RTNL();
+ hlist_del_init_rcu(&ifa->hash);
+}
+
+/**
+ * __ip_dev_find - find the first device with a given source address.
+ * @net: the net namespace
+ * @addr: the source address
+ * @devref: if true, take a reference on the found device
+ *
+ * If a caller uses devref=false, it should be protected by RCU, or RTNL
+ */
+struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
+{
+ struct net_device *result = NULL;
+ struct in_ifaddr *ifa;
+
+ rcu_read_lock();
+ ifa = inet_lookup_ifaddr_rcu(net, addr);
+ if (!ifa) {
+ struct flowi4 fl4 = { .daddr = addr };
+ struct fib_result res = { 0 };
+ struct fib_table *local;
+
+ /* Fallback to FIB local table so that communication
+ * over loopback subnets work.
+ */
+ local = fib_get_table(net, RT_TABLE_LOCAL);
+ if (local &&
+ !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
+ res.type == RTN_LOCAL)
+ result = FIB_RES_DEV(res);
+ } else {
+ result = ifa->ifa_dev->dev;
+ }
+ if (result && devref)
+ dev_hold(result);
+ rcu_read_unlock();
+ return result;
+}
+EXPORT_SYMBOL(__ip_dev_find);
+
+/* called under RCU lock */
+struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
+{
+ u32 hash = inet_addr_hash(net, addr);
+ struct in_ifaddr *ifa;
+
+ hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
+ if (ifa->ifa_local == addr &&
+ net_eq(dev_net(ifa->ifa_dev->dev), net))
+ return ifa;
+
+ return NULL;
+}
+
+static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
+
+static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
+static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
+static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
+ int destroy);
+#ifdef CONFIG_SYSCTL
+static int devinet_sysctl_register(struct in_device *idev);
+static void devinet_sysctl_unregister(struct in_device *idev);
+#else
+static int devinet_sysctl_register(struct in_device *idev)
+{
+ return 0;
+}
+static void devinet_sysctl_unregister(struct in_device *idev)
+{
+}
+#endif
+
+/* Locks all the inet devices. */
+
+static struct in_ifaddr *inet_alloc_ifa(void)
+{
+ return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
+}
+
+static void inet_rcu_free_ifa(struct rcu_head *head)
+{
+ struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
+ if (ifa->ifa_dev)
+ in_dev_put(ifa->ifa_dev);
+ kfree(ifa);
+}
+
+static void inet_free_ifa(struct in_ifaddr *ifa)
+{
+ call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
+}
+
+void in_dev_finish_destroy(struct in_device *idev)
+{
+ struct net_device *dev = idev->dev;
+
+ WARN_ON(idev->ifa_list);
+ WARN_ON(idev->mc_list);
+ kfree(rcu_dereference_protected(idev->mc_hash, 1));
+#ifdef NET_REFCNT_DEBUG
+ pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
+#endif
+ dev_put(dev);
+ if (!idev->dead)
+ pr_err("Freeing alive in_device %p\n", idev);
+ else
+ kfree(idev);
+}
+EXPORT_SYMBOL(in_dev_finish_destroy);
+
+static struct in_device *inetdev_init(struct net_device *dev)
+{
+ struct in_device *in_dev;
+ int err = -ENOMEM;
+
+ ASSERT_RTNL();
+
+ in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
+ if (!in_dev)
+ goto out;
+ memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
+ sizeof(in_dev->cnf));
+ in_dev->cnf.sysctl = NULL;
+ in_dev->dev = dev;
+ in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
+ if (!in_dev->arp_parms)
+ goto out_kfree;
+ if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
+ dev_disable_lro(dev);
+ /* Reference in_dev->dev */
+ dev_hold(dev);
+ /* Account for reference dev->ip_ptr (below) */
+ refcount_set(&in_dev->refcnt, 1);
+
+ err = devinet_sysctl_register(in_dev);
+ if (err) {
+ in_dev->dead = 1;
+ in_dev_put(in_dev);
+ in_dev = NULL;
+ goto out;
+ }
+ ip_mc_init_dev(in_dev);
+ if (dev->flags & IFF_UP)
+ ip_mc_up(in_dev);
+
+ /* we can receive as soon as ip_ptr is set -- do this last */
+ rcu_assign_pointer(dev->ip_ptr, in_dev);
+out:
+ return in_dev ?: ERR_PTR(err);
+out_kfree:
+ kfree(in_dev);
+ in_dev = NULL;
+ goto out;
+}
+
+static void in_dev_rcu_put(struct rcu_head *head)
+{
+ struct in_device *idev = container_of(head, struct in_device, rcu_head);
+ in_dev_put(idev);
+}
+
+static void inetdev_destroy(struct in_device *in_dev)
+{
+ struct in_ifaddr *ifa;
+ struct net_device *dev;
+
+ ASSERT_RTNL();
+
+ dev = in_dev->dev;
+
+ in_dev->dead = 1;
+
+ ip_mc_destroy_dev(in_dev);
+
+ while ((ifa = in_dev->ifa_list) != NULL) {
+ inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
+ inet_free_ifa(ifa);
+ }
+
+ RCU_INIT_POINTER(dev->ip_ptr, NULL);
+
+ devinet_sysctl_unregister(in_dev);
+ neigh_parms_release(&arp_tbl, in_dev->arp_parms);
+ arp_ifdown(dev);
+
+ call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
+}
+
+int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
+{
+ rcu_read_lock();
+ for_primary_ifa(in_dev) {
+ if (inet_ifa_match(a, ifa)) {
+ if (!b || inet_ifa_match(b, ifa)) {
+ rcu_read_unlock();
+ return 1;
+ }
+ }
+ } endfor_ifa(in_dev);
+ rcu_read_unlock();
+ return 0;
+}
+
+static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
+ int destroy, struct nlmsghdr *nlh, u32 portid)
+{
+ struct in_ifaddr *promote = NULL;
+ struct in_ifaddr *ifa, *ifa1 = *ifap;
+ struct in_ifaddr *last_prim = in_dev->ifa_list;
+ struct in_ifaddr *prev_prom = NULL;
+ int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
+
+ ASSERT_RTNL();
+
+ if (in_dev->dead)
+ goto no_promotions;
+
+ /* 1. Deleting primary ifaddr forces deletion all secondaries
+ * unless alias promotion is set
+ **/
+
+ if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
+ struct in_ifaddr **ifap1 = &ifa1->ifa_next;
+
+ while ((ifa = *ifap1) != NULL) {
+ if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
+ ifa1->ifa_scope <= ifa->ifa_scope)
+ last_prim = ifa;
+
+ if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
+ ifa1->ifa_mask != ifa->ifa_mask ||
+ !inet_ifa_match(ifa1->ifa_address, ifa)) {
+ ifap1 = &ifa->ifa_next;
+ prev_prom = ifa;
+ continue;
+ }
+
+ if (!do_promote) {
+ inet_hash_remove(ifa);
+ *ifap1 = ifa->ifa_next;
+
+ rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
+ blocking_notifier_call_chain(&inetaddr_chain,
+ NETDEV_DOWN, ifa);
+ inet_free_ifa(ifa);
+ } else {
+ promote = ifa;
+ break;
+ }
+ }
+ }
+
+ /* On promotion all secondaries from subnet are changing
+ * the primary IP, we must remove all their routes silently
+ * and later to add them back with new prefsrc. Do this
+ * while all addresses are on the device list.
+ */
+ for (ifa = promote; ifa; ifa = ifa->ifa_next) {
+ if (ifa1->ifa_mask == ifa->ifa_mask &&
+ inet_ifa_match(ifa1->ifa_address, ifa))
+ fib_del_ifaddr(ifa, ifa1);
+ }
+
+no_promotions:
+ /* 2. Unlink it */
+
+ *ifap = ifa1->ifa_next;
+ inet_hash_remove(ifa1);
+
+ /* 3. Announce address deletion */
+
+ /* Send message first, then call notifier.
+ At first sight, FIB update triggered by notifier
+ will refer to already deleted ifaddr, that could confuse
+ netlink listeners. It is not true: look, gated sees
+ that route deleted and if it still thinks that ifaddr
+ is valid, it will try to restore deleted routes... Grr.
+ So that, this order is correct.
+ */
+ rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
+ blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
+
+ if (promote) {
+ struct in_ifaddr *next_sec = promote->ifa_next;
+
+ if (prev_prom) {
+ prev_prom->ifa_next = promote->ifa_next;
+ promote->ifa_next = last_prim->ifa_next;
+ last_prim->ifa_next = promote;
+ }
+
+ promote->ifa_flags &= ~IFA_F_SECONDARY;
+ rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
+ blocking_notifier_call_chain(&inetaddr_chain,
+ NETDEV_UP, promote);
+ for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
+ if (ifa1->ifa_mask != ifa->ifa_mask ||
+ !inet_ifa_match(ifa1->ifa_address, ifa))
+ continue;
+ fib_add_ifaddr(ifa);
+ }
+
+ }
+ if (destroy)
+ inet_free_ifa(ifa1);
+}
+
+static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
+ int destroy)
+{
+ __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
+}
+
+static void check_lifetime(struct work_struct *work);
+
+static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
+
+static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
+ u32 portid, struct netlink_ext_ack *extack)
+{
+ struct in_device *in_dev = ifa->ifa_dev;
+ struct in_ifaddr *ifa1, **ifap, **last_primary;
+ struct in_validator_info ivi;
+ int ret;
+
+ ASSERT_RTNL();
+
+ if (!ifa->ifa_local) {
+ inet_free_ifa(ifa);
+ return 0;
+ }
+
+ ifa->ifa_flags &= ~IFA_F_SECONDARY;
+ last_primary = &in_dev->ifa_list;
+
+ for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
+ ifap = &ifa1->ifa_next) {
+ if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
+ ifa->ifa_scope <= ifa1->ifa_scope)
+ last_primary = &ifa1->ifa_next;
+ if (ifa1->ifa_mask == ifa->ifa_mask &&
+ inet_ifa_match(ifa1->ifa_address, ifa)) {
+ if (ifa1->ifa_local == ifa->ifa_local) {
+ inet_free_ifa(ifa);
+ return -EEXIST;
+ }
+ if (ifa1->ifa_scope != ifa->ifa_scope) {
+ inet_free_ifa(ifa);
+ return -EINVAL;
+ }
+ ifa->ifa_flags |= IFA_F_SECONDARY;
+ }
+ }
+
+ /* Allow any devices that wish to register ifaddr validtors to weigh
+ * in now, before changes are committed. The rntl lock is serializing
+ * access here, so the state should not change between a validator call
+ * and a final notify on commit. This isn't invoked on promotion under
+ * the assumption that validators are checking the address itself, and
+ * not the flags.
+ */
+ ivi.ivi_addr = ifa->ifa_address;
+ ivi.ivi_dev = ifa->ifa_dev;
+ ivi.extack = extack;
+ ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
+ NETDEV_UP, &ivi);
+ ret = notifier_to_errno(ret);
+ if (ret) {
+ inet_free_ifa(ifa);
+ return ret;
+ }
+
+ if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
+ prandom_seed((__force u32) ifa->ifa_local);
+ ifap = last_primary;
+ }
+
+ ifa->ifa_next = *ifap;
+ *ifap = ifa;
+
+ inet_hash_insert(dev_net(in_dev->dev), ifa);
+
+ cancel_delayed_work(&check_lifetime_work);
+ queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
+
+ /* Send message first, then call notifier.
+ Notifier will trigger FIB update, so that
+ listeners of netlink will know about new ifaddr */
+ rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
+ blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
+
+ return 0;
+}
+
+static int inet_insert_ifa(struct in_ifaddr *ifa)
+{
+ return __inet_insert_ifa(ifa, NULL, 0, NULL);
+}
+
+static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
+{
+ struct in_device *in_dev = __in_dev_get_rtnl(dev);
+
+ ASSERT_RTNL();
+
+ if (!in_dev) {
+ inet_free_ifa(ifa);
+ return -ENOBUFS;
+ }
+ ipv4_devconf_setall(in_dev);
+ neigh_parms_data_state_setall(in_dev->arp_parms);
+ if (ifa->ifa_dev != in_dev) {
+ WARN_ON(ifa->ifa_dev);
+ in_dev_hold(in_dev);
+ ifa->ifa_dev = in_dev;
+ }
+ if (ipv4_is_loopback(ifa->ifa_local))
+ ifa->ifa_scope = RT_SCOPE_HOST;
+ return inet_insert_ifa(ifa);
+}
+
+/* Caller must hold RCU or RTNL :
+ * We dont take a reference on found in_device
+ */
+struct in_device *inetdev_by_index(struct net *net, int ifindex)
+{
+ struct net_device *dev;
+ struct in_device *in_dev = NULL;
+
+ rcu_read_lock();
+ dev = dev_get_by_index_rcu(net, ifindex);
+ if (dev)
+ in_dev = rcu_dereference_rtnl(dev->ip_ptr);
+ rcu_read_unlock();
+ return in_dev;
+}
+EXPORT_SYMBOL(inetdev_by_index);
+
+/* Called only from RTNL semaphored context. No locks. */
+
+struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
+ __be32 mask)
+{
+ ASSERT_RTNL();
+
+ for_primary_ifa(in_dev) {
+ if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
+ return ifa;
+ } endfor_ifa(in_dev);
+ return NULL;
+}
+
+static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
+{
+ struct ip_mreqn mreq = {
+ .imr_multiaddr.s_addr = ifa->ifa_address,
+ .imr_ifindex = ifa->ifa_dev->dev->ifindex,
+ };
+ int ret;
+
+ ASSERT_RTNL();
+
+ lock_sock(sk);
+ if (join)
+ ret = ip_mc_join_group(sk, &mreq);
+ else
+ ret = ip_mc_leave_group(sk, &mreq);
+ release_sock(sk);
+
+ return ret;
+}
+
+static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *tb[IFA_MAX+1];
+ struct in_device *in_dev;
+ struct ifaddrmsg *ifm;
+ struct in_ifaddr *ifa, **ifap;
+ int err = -EINVAL;
+
+ ASSERT_RTNL();
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy,
+ extack);
+ if (err < 0)
+ goto errout;
+
+ ifm = nlmsg_data(nlh);
+ in_dev = inetdev_by_index(net, ifm->ifa_index);
+ if (!in_dev) {
+ err = -ENODEV;
+ goto errout;
+ }
+
+ for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
+ ifap = &ifa->ifa_next) {
+ if (tb[IFA_LOCAL] &&
+ ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
+ continue;
+
+ if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
+ continue;
+
+ if (tb[IFA_ADDRESS] &&
+ (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
+ !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
+ continue;
+
+ if (ipv4_is_multicast(ifa->ifa_address))
+ ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
+ __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
+ return 0;
+ }
+
+ err = -EADDRNOTAVAIL;
+errout:
+ return err;
+}
+
+#define INFINITY_LIFE_TIME 0xFFFFFFFF
+
+static void check_lifetime(struct work_struct *work)
+{
+ unsigned long now, next, next_sec, next_sched;
+ struct in_ifaddr *ifa;
+ struct hlist_node *n;
+ int i;
+
+ now = jiffies;
+ next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
+
+ for (i = 0; i < IN4_ADDR_HSIZE; i++) {
+ bool change_needed = false;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
+ unsigned long age;
+
+ if (ifa->ifa_flags & IFA_F_PERMANENT)
+ continue;
+
+ /* We try to batch several events at once. */
+ age = (now - ifa->ifa_tstamp +
+ ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+
+ if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
+ age >= ifa->ifa_valid_lft) {
+ change_needed = true;
+ } else if (ifa->ifa_preferred_lft ==
+ INFINITY_LIFE_TIME) {
+ continue;
+ } else if (age >= ifa->ifa_preferred_lft) {
+ if (time_before(ifa->ifa_tstamp +
+ ifa->ifa_valid_lft * HZ, next))
+ next = ifa->ifa_tstamp +
+ ifa->ifa_valid_lft * HZ;
+
+ if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
+ change_needed = true;
+ } else if (time_before(ifa->ifa_tstamp +
+ ifa->ifa_preferred_lft * HZ,
+ next)) {
+ next = ifa->ifa_tstamp +
+ ifa->ifa_preferred_lft * HZ;
+ }
+ }
+ rcu_read_unlock();
+ if (!change_needed)
+ continue;
+ rtnl_lock();
+ hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
+ unsigned long age;
+
+ if (ifa->ifa_flags & IFA_F_PERMANENT)
+ continue;
+
+ /* We try to batch several events at once. */
+ age = (now - ifa->ifa_tstamp +
+ ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+
+ if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
+ age >= ifa->ifa_valid_lft) {
+ struct in_ifaddr **ifap;
+
+ for (ifap = &ifa->ifa_dev->ifa_list;
+ *ifap != NULL; ifap = &(*ifap)->ifa_next) {
+ if (*ifap == ifa) {
+ inet_del_ifa(ifa->ifa_dev,
+ ifap, 1);
+ break;
+ }
+ }
+ } else if (ifa->ifa_preferred_lft !=
+ INFINITY_LIFE_TIME &&
+ age >= ifa->ifa_preferred_lft &&
+ !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
+ ifa->ifa_flags |= IFA_F_DEPRECATED;
+ rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
+ }
+ }
+ rtnl_unlock();
+ }
+
+ 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;
+
+ now = jiffies;
+ /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
+ if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
+ next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
+
+ queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
+ next_sched - now);
+}
+
+static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
+ __u32 prefered_lft)
+{
+ unsigned long timeout;
+
+ ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
+
+ timeout = addrconf_timeout_fixup(valid_lft, HZ);
+ if (addrconf_finite_timeout(timeout))
+ ifa->ifa_valid_lft = timeout;
+ else
+ ifa->ifa_flags |= IFA_F_PERMANENT;
+
+ timeout = addrconf_timeout_fixup(prefered_lft, HZ);
+ if (addrconf_finite_timeout(timeout)) {
+ if (timeout == 0)
+ ifa->ifa_flags |= IFA_F_DEPRECATED;
+ ifa->ifa_preferred_lft = timeout;
+ }
+ ifa->ifa_tstamp = jiffies;
+ if (!ifa->ifa_cstamp)
+ ifa->ifa_cstamp = ifa->ifa_tstamp;
+}
+
+static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
+ __u32 *pvalid_lft, __u32 *pprefered_lft)
+{
+ struct nlattr *tb[IFA_MAX+1];
+ struct in_ifaddr *ifa;
+ struct ifaddrmsg *ifm;
+ struct net_device *dev;
+ struct in_device *in_dev;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy,
+ NULL);
+ if (err < 0)
+ goto errout;
+
+ ifm = nlmsg_data(nlh);
+ err = -EINVAL;
+ if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
+ goto errout;
+
+ dev = __dev_get_by_index(net, ifm->ifa_index);
+ err = -ENODEV;
+ if (!dev)
+ goto errout;
+
+ in_dev = __in_dev_get_rtnl(dev);
+ err = -ENOBUFS;
+ if (!in_dev)
+ goto errout;
+
+ ifa = inet_alloc_ifa();
+ if (!ifa)
+ /*
+ * A potential indev allocation can be left alive, it stays
+ * assigned to its device and is destroy with it.
+ */
+ goto errout;
+
+ ipv4_devconf_setall(in_dev);
+ neigh_parms_data_state_setall(in_dev->arp_parms);
+ in_dev_hold(in_dev);
+
+ if (!tb[IFA_ADDRESS])
+ tb[IFA_ADDRESS] = tb[IFA_LOCAL];
+
+ INIT_HLIST_NODE(&ifa->hash);
+ ifa->ifa_prefixlen = ifm->ifa_prefixlen;
+ ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
+ ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
+ ifm->ifa_flags;
+ ifa->ifa_scope = ifm->ifa_scope;
+ ifa->ifa_dev = in_dev;
+
+ ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
+ ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
+
+ if (tb[IFA_BROADCAST])
+ ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
+
+ if (tb[IFA_LABEL])
+ nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
+ else
+ memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+
+ if (tb[IFA_RT_PRIORITY])
+ ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
+
+ if (tb[IFA_CACHEINFO]) {
+ struct ifa_cacheinfo *ci;
+
+ ci = nla_data(tb[IFA_CACHEINFO]);
+ if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
+ err = -EINVAL;
+ goto errout_free;
+ }
+ *pvalid_lft = ci->ifa_valid;
+ *pprefered_lft = ci->ifa_prefered;
+ }
+
+ return ifa;
+
+errout_free:
+ inet_free_ifa(ifa);
+errout:
+ return ERR_PTR(err);
+}
+
+static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
+{
+ struct in_device *in_dev = ifa->ifa_dev;
+ struct in_ifaddr *ifa1, **ifap;
+
+ if (!ifa->ifa_local)
+ return NULL;
+
+ for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
+ ifap = &ifa1->ifa_next) {
+ if (ifa1->ifa_mask == ifa->ifa_mask &&
+ inet_ifa_match(ifa1->ifa_address, ifa) &&
+ ifa1->ifa_local == ifa->ifa_local)
+ return ifa1;
+ }
+ return NULL;
+}
+
+static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct in_ifaddr *ifa;
+ struct in_ifaddr *ifa_existing;
+ __u32 valid_lft = INFINITY_LIFE_TIME;
+ __u32 prefered_lft = INFINITY_LIFE_TIME;
+
+ ASSERT_RTNL();
+
+ ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
+ if (IS_ERR(ifa))
+ return PTR_ERR(ifa);
+
+ ifa_existing = find_matching_ifa(ifa);
+ if (!ifa_existing) {
+ /* It would be best to check for !NLM_F_CREATE here but
+ * userspace already relies on not having to provide this.
+ */
+ set_ifa_lifetime(ifa, valid_lft, prefered_lft);
+ if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
+ int ret = ip_mc_config(net->ipv4.mc_autojoin_sk,
+ true, ifa);
+
+ if (ret < 0) {
+ inet_free_ifa(ifa);
+ return ret;
+ }
+ }
+ return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
+ extack);
+ } else {
+ u32 new_metric = ifa->ifa_rt_priority;
+
+ inet_free_ifa(ifa);
+
+ if (nlh->nlmsg_flags & NLM_F_EXCL ||
+ !(nlh->nlmsg_flags & NLM_F_REPLACE))
+ return -EEXIST;
+ ifa = ifa_existing;
+
+ if (ifa->ifa_rt_priority != new_metric) {
+ fib_modify_prefix_metric(ifa, new_metric);
+ ifa->ifa_rt_priority = new_metric;
+ }
+
+ set_ifa_lifetime(ifa, valid_lft, prefered_lft);
+ cancel_delayed_work(&check_lifetime_work);
+ queue_delayed_work(system_power_efficient_wq,
+ &check_lifetime_work, 0);
+ rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
+ }
+ return 0;
+}
+
+/*
+ * Determine a default network mask, based on the IP address.
+ */
+
+static int inet_abc_len(__be32 addr)
+{
+ int rc = -1; /* Something else, probably a multicast. */
+
+ if (ipv4_is_zeronet(addr))
+ rc = 0;
+ else {
+ __u32 haddr = ntohl(addr);
+
+ if (IN_CLASSA(haddr))
+ rc = 8;
+ else if (IN_CLASSB(haddr))
+ rc = 16;
+ else if (IN_CLASSC(haddr))
+ rc = 24;
+ }
+
+ return rc;
+}
+
+
+int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
+{
+ struct sockaddr_in sin_orig;
+ struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
+ struct in_device *in_dev;
+ struct in_ifaddr **ifap = NULL;
+ struct in_ifaddr *ifa = NULL;
+ struct net_device *dev;
+ char *colon;
+ int ret = -EFAULT;
+ int tryaddrmatch = 0;
+
+ ifr->ifr_name[IFNAMSIZ - 1] = 0;
+
+ /* save original address for comparison */
+ memcpy(&sin_orig, sin, sizeof(*sin));
+
+ colon = strchr(ifr->ifr_name, ':');
+ if (colon)
+ *colon = 0;
+
+ dev_load(net, ifr->ifr_name);
+
+ switch (cmd) {
+ case SIOCGIFADDR: /* Get interface address */
+ case SIOCGIFBRDADDR: /* Get the broadcast address */
+ case SIOCGIFDSTADDR: /* Get the destination address */
+ case SIOCGIFNETMASK: /* Get the netmask for the interface */
+ /* Note that these ioctls will not sleep,
+ so that we do not impose a lock.
+ One day we will be forced to put shlock here (I mean SMP)
+ */
+ tryaddrmatch = (sin_orig.sin_family == AF_INET);
+ memset(sin, 0, sizeof(*sin));
+ sin->sin_family = AF_INET;
+ break;
+
+ case SIOCSIFFLAGS:
+ ret = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ goto out;
+ break;
+ case SIOCSIFADDR: /* Set interface address (and family) */
+ case SIOCSIFBRDADDR: /* Set the broadcast address */
+ case SIOCSIFDSTADDR: /* Set the destination address */
+ case SIOCSIFNETMASK: /* Set the netmask for the interface */
+ ret = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ goto out;
+ ret = -EINVAL;
+ if (sin->sin_family != AF_INET)
+ goto out;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out;
+ }
+
+ rtnl_lock();
+
+ ret = -ENODEV;
+ dev = __dev_get_by_name(net, ifr->ifr_name);
+ if (!dev)
+ goto done;
+
+ if (colon)
+ *colon = ':';
+
+ in_dev = __in_dev_get_rtnl(dev);
+ if (in_dev) {
+ if (tryaddrmatch) {
+ /* Matthias Andree */
+ /* compare label and address (4.4BSD style) */
+ /* note: we only do this for a limited set of ioctls
+ and only if the original address family was AF_INET.
+ This is checked above. */
+ for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
+ ifap = &ifa->ifa_next) {
+ if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
+ sin_orig.sin_addr.s_addr ==
+ ifa->ifa_local) {
+ break; /* found */
+ }
+ }
+ }
+ /* we didn't get a match, maybe the application is
+ 4.3BSD-style and passed in junk so we fall back to
+ comparing just the label */
+ if (!ifa) {
+ for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
+ ifap = &ifa->ifa_next)
+ if (!strcmp(ifr->ifr_name, ifa->ifa_label))
+ break;
+ }
+ }
+
+ ret = -EADDRNOTAVAIL;
+ if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
+ goto done;
+
+ switch (cmd) {
+ case SIOCGIFADDR: /* Get interface address */
+ ret = 0;
+ sin->sin_addr.s_addr = ifa->ifa_local;
+ break;
+
+ case SIOCGIFBRDADDR: /* Get the broadcast address */
+ ret = 0;
+ sin->sin_addr.s_addr = ifa->ifa_broadcast;
+ break;
+
+ case SIOCGIFDSTADDR: /* Get the destination address */
+ ret = 0;
+ sin->sin_addr.s_addr = ifa->ifa_address;
+ break;
+
+ case SIOCGIFNETMASK: /* Get the netmask for the interface */
+ ret = 0;
+ sin->sin_addr.s_addr = ifa->ifa_mask;
+ break;
+
+ case SIOCSIFFLAGS:
+ if (colon) {
+ ret = -EADDRNOTAVAIL;
+ if (!ifa)
+ break;
+ ret = 0;
+ if (!(ifr->ifr_flags & IFF_UP))
+ inet_del_ifa(in_dev, ifap, 1);
+ break;
+ }
+ ret = dev_change_flags(dev, ifr->ifr_flags);
+ break;
+
+ case SIOCSIFADDR: /* Set interface address (and family) */
+ ret = -EINVAL;
+ if (inet_abc_len(sin->sin_addr.s_addr) < 0)
+ break;
+
+ if (!ifa) {
+ ret = -ENOBUFS;
+ ifa = inet_alloc_ifa();
+ if (!ifa)
+ break;
+ INIT_HLIST_NODE(&ifa->hash);
+ if (colon)
+ memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
+ else
+ memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+ } else {
+ ret = 0;
+ if (ifa->ifa_local == sin->sin_addr.s_addr)
+ break;
+ inet_del_ifa(in_dev, ifap, 0);
+ ifa->ifa_broadcast = 0;
+ ifa->ifa_scope = 0;
+ }
+
+ ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
+
+ if (!(dev->flags & IFF_POINTOPOINT)) {
+ ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
+ ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
+ if ((dev->flags & IFF_BROADCAST) &&
+ ifa->ifa_prefixlen < 31)
+ ifa->ifa_broadcast = ifa->ifa_address |
+ ~ifa->ifa_mask;
+ } else {
+ ifa->ifa_prefixlen = 32;
+ ifa->ifa_mask = inet_make_mask(32);
+ }
+ set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
+ ret = inet_set_ifa(dev, ifa);
+ break;
+
+ case SIOCSIFBRDADDR: /* Set the broadcast address */
+ ret = 0;
+ if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
+ inet_del_ifa(in_dev, ifap, 0);
+ ifa->ifa_broadcast = sin->sin_addr.s_addr;
+ inet_insert_ifa(ifa);
+ }
+ break;
+
+ case SIOCSIFDSTADDR: /* Set the destination address */
+ ret = 0;
+ if (ifa->ifa_address == sin->sin_addr.s_addr)
+ break;
+ ret = -EINVAL;
+ if (inet_abc_len(sin->sin_addr.s_addr) < 0)
+ break;
+ ret = 0;
+ inet_del_ifa(in_dev, ifap, 0);
+ ifa->ifa_address = sin->sin_addr.s_addr;
+ inet_insert_ifa(ifa);
+ break;
+
+ case SIOCSIFNETMASK: /* Set the netmask for the interface */
+
+ /*
+ * The mask we set must be legal.
+ */
+ ret = -EINVAL;
+ if (bad_mask(sin->sin_addr.s_addr, 0))
+ break;
+ ret = 0;
+ if (ifa->ifa_mask != sin->sin_addr.s_addr) {
+ __be32 old_mask = ifa->ifa_mask;
+ inet_del_ifa(in_dev, ifap, 0);
+ ifa->ifa_mask = sin->sin_addr.s_addr;
+ ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
+
+ /* See if current broadcast address matches
+ * with current netmask, then recalculate
+ * the broadcast address. Otherwise it's a
+ * funny address, so don't touch it since
+ * the user seems to know what (s)he's doing...
+ */
+ if ((dev->flags & IFF_BROADCAST) &&
+ (ifa->ifa_prefixlen < 31) &&
+ (ifa->ifa_broadcast ==
+ (ifa->ifa_local|~old_mask))) {
+ ifa->ifa_broadcast = (ifa->ifa_local |
+ ~sin->sin_addr.s_addr);
+ }
+ inet_insert_ifa(ifa);
+ }
+ break;
+ }
+done:
+ rtnl_unlock();
+out:
+ return ret;
+}
+
+static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
+{
+ struct in_device *in_dev = __in_dev_get_rtnl(dev);
+ struct in_ifaddr *ifa;
+ struct ifreq ifr;
+ int done = 0;
+
+ if (WARN_ON(size > sizeof(struct ifreq)))
+ goto out;
+
+ if (!in_dev)
+ goto out;
+
+ for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
+ if (!buf) {
+ done += size;
+ continue;
+ }
+ if (len < size)
+ break;
+ memset(&ifr, 0, sizeof(struct ifreq));
+ strcpy(ifr.ifr_name, ifa->ifa_label);
+
+ (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
+ (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
+ ifa->ifa_local;
+
+ if (copy_to_user(buf + done, &ifr, size)) {
+ done = -EFAULT;
+ break;
+ }
+ len -= size;
+ done += size;
+ }
+out:
+ return done;
+}
+
+static __be32 in_dev_select_addr(const struct in_device *in_dev,
+ int scope)
+{
+ for_primary_ifa(in_dev) {
+ if (ifa->ifa_scope != RT_SCOPE_LINK &&
+ ifa->ifa_scope <= scope)
+ return ifa->ifa_local;
+ } endfor_ifa(in_dev);
+
+ return 0;
+}
+
+__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
+{
+ __be32 addr = 0;
+ struct in_device *in_dev;
+ struct net *net = dev_net(dev);
+ int master_idx;
+
+ rcu_read_lock();
+ in_dev = __in_dev_get_rcu(dev);
+ if (!in_dev)
+ goto no_in_dev;
+
+ for_primary_ifa(in_dev) {
+ if (ifa->ifa_scope > scope)
+ continue;
+ if (!dst || inet_ifa_match(dst, ifa)) {
+ addr = ifa->ifa_local;
+ break;
+ }
+ if (!addr)
+ addr = ifa->ifa_local;
+ } endfor_ifa(in_dev);
+
+ if (addr)
+ goto out_unlock;
+no_in_dev:
+ master_idx = l3mdev_master_ifindex_rcu(dev);
+
+ /* For VRFs, the VRF device takes the place of the loopback device,
+ * with addresses on it being preferred. Note in such cases the
+ * loopback device will be among the devices that fail the master_idx
+ * equality check in the loop below.
+ */
+ if (master_idx &&
+ (dev = dev_get_by_index_rcu(net, master_idx)) &&
+ (in_dev = __in_dev_get_rcu(dev))) {
+ addr = in_dev_select_addr(in_dev, scope);
+ if (addr)
+ goto out_unlock;
+ }
+
+ /* Not loopback addresses on loopback should be preferred
+ in this case. It is important that lo is the first interface
+ in dev_base list.
+ */
+ for_each_netdev_rcu(net, dev) {
+ if (l3mdev_master_ifindex_rcu(dev) != master_idx)
+ continue;
+
+ in_dev = __in_dev_get_rcu(dev);
+ if (!in_dev)
+ continue;
+
+ addr = in_dev_select_addr(in_dev, scope);
+ if (addr)
+ goto out_unlock;
+ }
+out_unlock:
+ rcu_read_unlock();
+ return addr;
+}
+EXPORT_SYMBOL(inet_select_addr);
+
+static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
+ __be32 local, int scope)
+{
+ int same = 0;
+ __be32 addr = 0;
+
+ for_ifa(in_dev) {
+ if (!addr &&
+ (local == ifa->ifa_local || !local) &&
+ ifa->ifa_scope <= scope) {
+ addr = ifa->ifa_local;
+ if (same)
+ break;
+ }
+ if (!same) {
+ same = (!local || inet_ifa_match(local, ifa)) &&
+ (!dst || inet_ifa_match(dst, ifa));
+ if (same && addr) {
+ if (local || !dst)
+ break;
+ /* Is the selected addr into dst subnet? */
+ if (inet_ifa_match(addr, ifa))
+ break;
+ /* No, then can we use new local src? */
+ if (ifa->ifa_scope <= scope) {
+ addr = ifa->ifa_local;
+ break;
+ }
+ /* search for large dst subnet for addr */
+ same = 0;
+ }
+ }
+ } endfor_ifa(in_dev);
+
+ return same ? addr : 0;
+}
+
+/*
+ * Confirm that local IP address exists using wildcards:
+ * - net: netns to check, cannot be NULL
+ * - in_dev: only on this interface, NULL=any interface
+ * - dst: only in the same subnet as dst, 0=any dst
+ * - local: address, 0=autoselect the local address
+ * - scope: maximum allowed scope value for the local address
+ */
+__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
+ __be32 dst, __be32 local, int scope)
+{
+ __be32 addr = 0;
+ struct net_device *dev;
+
+ if (in_dev)
+ return confirm_addr_indev(in_dev, dst, local, scope);
+
+ rcu_read_lock();
+ for_each_netdev_rcu(net, dev) {
+ in_dev = __in_dev_get_rcu(dev);
+ if (in_dev) {
+ addr = confirm_addr_indev(in_dev, dst, local, scope);
+ if (addr)
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ return addr;
+}
+EXPORT_SYMBOL(inet_confirm_addr);
+
+/*
+ * Device notifier
+ */
+
+int register_inetaddr_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&inetaddr_chain, nb);
+}
+EXPORT_SYMBOL(register_inetaddr_notifier);
+
+int unregister_inetaddr_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
+}
+EXPORT_SYMBOL(unregister_inetaddr_notifier);
+
+int register_inetaddr_validator_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
+}
+EXPORT_SYMBOL(register_inetaddr_validator_notifier);
+
+int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
+ nb);
+}
+EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
+
+/* Rename ifa_labels for a device name change. Make some effort to preserve
+ * existing alias numbering and to create unique labels if possible.
+*/
+static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
+{
+ struct in_ifaddr *ifa;
+ int named = 0;
+
+ for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
+ char old[IFNAMSIZ], *dot;
+
+ memcpy(old, ifa->ifa_label, IFNAMSIZ);
+ memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+ if (named++ == 0)
+ goto skip;
+ dot = strchr(old, ':');
+ if (!dot) {
+ sprintf(old, ":%d", named);
+ dot = old;
+ }
+ if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
+ strcat(ifa->ifa_label, dot);
+ else
+ strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
+skip:
+ rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
+ }
+}
+
+static bool inetdev_valid_mtu(unsigned int mtu)
+{
+ return mtu >= IPV4_MIN_MTU;
+}
+
+static void inetdev_send_gratuitous_arp(struct net_device *dev,
+ struct in_device *in_dev)
+
+{
+ struct in_ifaddr *ifa;
+
+ for (ifa = in_dev->ifa_list; ifa;
+ ifa = ifa->ifa_next) {
+ arp_send(ARPOP_REQUEST, ETH_P_ARP,
+ ifa->ifa_local, dev,
+ ifa->ifa_local, NULL,
+ dev->dev_addr, NULL);
+ }
+}
+
+/* Called only under RTNL semaphore */
+
+static int inetdev_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct in_device *in_dev = __in_dev_get_rtnl(dev);
+
+ ASSERT_RTNL();
+
+ if (!in_dev) {
+ if (event == NETDEV_REGISTER) {
+ in_dev = inetdev_init(dev);
+ if (IS_ERR(in_dev))
+ return notifier_from_errno(PTR_ERR(in_dev));
+ if (dev->flags & IFF_LOOPBACK) {
+ IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
+ IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
+ }
+ } else if (event == NETDEV_CHANGEMTU) {
+ /* Re-enabling IP */
+ if (inetdev_valid_mtu(dev->mtu))
+ in_dev = inetdev_init(dev);
+ }
+ goto out;
+ }
+
+ switch (event) {
+ case NETDEV_REGISTER:
+ pr_debug("%s: bug\n", __func__);
+ RCU_INIT_POINTER(dev->ip_ptr, NULL);
+ break;
+ case NETDEV_UP:
+ if (!inetdev_valid_mtu(dev->mtu))
+ break;
+ if (dev->flags & IFF_LOOPBACK) {
+ struct in_ifaddr *ifa = inet_alloc_ifa();
+
+ if (ifa) {
+ INIT_HLIST_NODE(&ifa->hash);
+ ifa->ifa_local =
+ ifa->ifa_address = htonl(INADDR_LOOPBACK);
+ ifa->ifa_prefixlen = 8;
+ ifa->ifa_mask = inet_make_mask(8);
+ in_dev_hold(in_dev);
+ ifa->ifa_dev = in_dev;
+ ifa->ifa_scope = RT_SCOPE_HOST;
+ memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+ set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
+ INFINITY_LIFE_TIME);
+ ipv4_devconf_setall(in_dev);
+ neigh_parms_data_state_setall(in_dev->arp_parms);
+ inet_insert_ifa(ifa);
+ }
+ }
+ ip_mc_up(in_dev);
+ /* fall through */
+ case NETDEV_CHANGEADDR:
+ if (!IN_DEV_ARP_NOTIFY(in_dev))
+ break;
+ /* fall through */
+ case NETDEV_NOTIFY_PEERS:
+ /* Send gratuitous ARP to notify of link change */
+ inetdev_send_gratuitous_arp(dev, in_dev);
+ break;
+ case NETDEV_DOWN:
+ ip_mc_down(in_dev);
+ break;
+ case NETDEV_PRE_TYPE_CHANGE:
+ ip_mc_unmap(in_dev);
+ break;
+ case NETDEV_POST_TYPE_CHANGE:
+ ip_mc_remap(in_dev);
+ break;
+ case NETDEV_CHANGEMTU:
+ if (inetdev_valid_mtu(dev->mtu))
+ break;
+ /* disable IP when MTU is not enough */
+ /* fall through */
+ case NETDEV_UNREGISTER:
+ inetdev_destroy(in_dev);
+ break;
+ case NETDEV_CHANGENAME:
+ /* Do not notify about label change, this event is
+ * not interesting to applications using netlink.
+ */
+ inetdev_changename(dev, in_dev);
+
+ devinet_sysctl_unregister(in_dev);
+ devinet_sysctl_register(in_dev);
+ break;
+ }
+out:
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block ip_netdev_notifier = {
+ .notifier_call = inetdev_event,
+};
+
+static size_t inet_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
+ + nla_total_size(4) /* IFA_ADDRESS */
+ + nla_total_size(4) /* IFA_LOCAL */
+ + nla_total_size(4) /* IFA_BROADCAST */
+ + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
+ + nla_total_size(4) /* IFA_FLAGS */
+ + nla_total_size(4) /* IFA_RT_PRIORITY */
+ + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
+}
+
+static inline u32 cstamp_delta(unsigned long cstamp)
+{
+ return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
+}
+
+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 int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
+ u32 portid, u32 seq, int event, unsigned int flags)
+{
+ struct ifaddrmsg *ifm;
+ struct nlmsghdr *nlh;
+ u32 preferred, valid;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ ifm = nlmsg_data(nlh);
+ ifm->ifa_family = AF_INET;
+ ifm->ifa_prefixlen = ifa->ifa_prefixlen;
+ ifm->ifa_flags = ifa->ifa_flags;
+ ifm->ifa_scope = ifa->ifa_scope;
+ ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
+
+ if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
+ preferred = ifa->ifa_preferred_lft;
+ valid = ifa->ifa_valid_lft;
+ if (preferred != INFINITY_LIFE_TIME) {
+ long tval = (jiffies - ifa->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 ((ifa->ifa_address &&
+ nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
+ (ifa->ifa_local &&
+ nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
+ (ifa->ifa_broadcast &&
+ nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
+ (ifa->ifa_label[0] &&
+ nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
+ nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
+ (ifa->ifa_rt_priority &&
+ nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
+ put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
+ preferred, valid))
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ int h, s_h;
+ int idx, s_idx;
+ int ip_idx, s_ip_idx;
+ struct net_device *dev;
+ struct in_device *in_dev;
+ struct in_ifaddr *ifa;
+ struct hlist_head *head;
+
+ s_h = cb->args[0];
+ s_idx = idx = cb->args[1];
+ s_ip_idx = ip_idx = cb->args[2];
+
+ 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->ipv4.dev_addr_genid) ^
+ net->dev_base_seq;
+ 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;
+ in_dev = __in_dev_get_rcu(dev);
+ if (!in_dev)
+ goto cont;
+
+ for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
+ ifa = ifa->ifa_next, ip_idx++) {
+ if (ip_idx < s_ip_idx)
+ continue;
+ if (inet_fill_ifaddr(skb, ifa,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWADDR, NLM_F_MULTI) < 0) {
+ rcu_read_unlock();
+ goto done;
+ }
+ nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+ }
+cont:
+ idx++;
+ }
+ rcu_read_unlock();
+ }
+
+done:
+ cb->args[0] = h;
+ cb->args[1] = idx;
+ cb->args[2] = ip_idx;
+
+ return skb->len;
+}
+
+static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
+ u32 portid)
+{
+ struct sk_buff *skb;
+ u32 seq = nlh ? nlh->nlmsg_seq : 0;
+ int err = -ENOBUFS;
+ struct net *net;
+
+ net = dev_net(ifa->ifa_dev->dev);
+ skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
+ if (!skb)
+ goto errout;
+
+ err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
+}
+
+static size_t inet_get_link_af_size(const struct net_device *dev,
+ u32 ext_filter_mask)
+{
+ struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
+
+ if (!in_dev)
+ return 0;
+
+ return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
+}
+
+static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
+ u32 ext_filter_mask)
+{
+ struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
+ struct nlattr *nla;
+ int i;
+
+ if (!in_dev)
+ return -ENODATA;
+
+ nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
+ if (!nla)
+ return -EMSGSIZE;
+
+ for (i = 0; i < IPV4_DEVCONF_MAX; i++)
+ ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
+
+ return 0;
+}
+
+static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
+ [IFLA_INET_CONF] = { .type = NLA_NESTED },
+};
+
+static int inet_validate_link_af(const struct net_device *dev,
+ const struct nlattr *nla)
+{
+ struct nlattr *a, *tb[IFLA_INET_MAX+1];
+ int err, rem;
+
+ if (dev && !__in_dev_get_rcu(dev))
+ return -EAFNOSUPPORT;
+
+ err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy, NULL);
+ if (err < 0)
+ return err;
+
+ if (tb[IFLA_INET_CONF]) {
+ nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
+ int cfgid = nla_type(a);
+
+ if (nla_len(a) < 4)
+ return -EINVAL;
+
+ if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
+{
+ struct in_device *in_dev = __in_dev_get_rcu(dev);
+ struct nlattr *a, *tb[IFLA_INET_MAX+1];
+ int rem;
+
+ if (!in_dev)
+ return -EAFNOSUPPORT;
+
+ if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
+ BUG();
+
+ if (tb[IFLA_INET_CONF]) {
+ nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
+ ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
+ }
+
+ return 0;
+}
+
+static int inet_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);
+ if (all || type == NETCONFA_RP_FILTER)
+ size += nla_total_size(4);
+ if (all || type == NETCONFA_MC_FORWARDING)
+ size += nla_total_size(4);
+ if (all || type == NETCONFA_BC_FORWARDING)
+ size += nla_total_size(4);
+ 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 inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
+ struct ipv4_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_INET;
+
+ 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,
+ IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
+ goto nla_put_failure;
+ if ((all || type == NETCONFA_RP_FILTER) &&
+ nla_put_s32(skb, NETCONFA_RP_FILTER,
+ IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
+ goto nla_put_failure;
+ if ((all || type == NETCONFA_MC_FORWARDING) &&
+ nla_put_s32(skb, NETCONFA_MC_FORWARDING,
+ IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
+ goto nla_put_failure;
+ if ((all || type == NETCONFA_BC_FORWARDING) &&
+ nla_put_s32(skb, NETCONFA_BC_FORWARDING,
+ IPV4_DEVCONF(*devconf, BC_FORWARDING)) < 0)
+ goto nla_put_failure;
+ if ((all || type == NETCONFA_PROXY_NEIGH) &&
+ nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
+ IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
+ goto nla_put_failure;
+ if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
+ nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+ IPV4_DEVCONF(*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 inet_netconf_notify_devconf(struct net *net, int event, int type,
+ int ifindex, struct ipv4_devconf *devconf)
+{
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
+ if (!skb)
+ goto errout;
+
+ err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
+ event, 0, type);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
+}
+
+static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
+ [NETCONFA_IFINDEX] = { .len = sizeof(int) },
+ [NETCONFA_FORWARDING] = { .len = sizeof(int) },
+ [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
+ [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
+ [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
+};
+
+static int inet_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 netconfmsg *ncm;
+ struct sk_buff *skb;
+ struct ipv4_devconf *devconf;
+ struct in_device *in_dev;
+ struct net_device *dev;
+ int ifindex;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
+ devconf_ipv4_policy, extack);
+ if (err < 0)
+ goto errout;
+
+ err = -EINVAL;
+ if (!tb[NETCONFA_IFINDEX])
+ goto errout;
+
+ ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
+ switch (ifindex) {
+ case NETCONFA_IFINDEX_ALL:
+ devconf = net->ipv4.devconf_all;
+ break;
+ case NETCONFA_IFINDEX_DEFAULT:
+ devconf = net->ipv4.devconf_dflt;
+ break;
+ default:
+ dev = __dev_get_by_index(net, ifindex);
+ if (!dev)
+ goto errout;
+ in_dev = __in_dev_get_rtnl(dev);
+ if (!in_dev)
+ goto errout;
+ devconf = &in_dev->cnf;
+ break;
+ }
+
+ err = -ENOBUFS;
+ skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
+ if (!skb)
+ goto errout;
+
+ err = inet_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 inet_netconf_msgsize_devconf() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+errout:
+ return err;
+}
+
+static int inet_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 in_device *in_dev;
+ 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->ipv4.dev_addr_genid) ^
+ net->dev_base_seq;
+ hlist_for_each_entry_rcu(dev, head, index_hlist) {
+ if (idx < s_idx)
+ goto cont;
+ in_dev = __in_dev_get_rcu(dev);
+ if (!in_dev)
+ goto cont;
+
+ if (inet_netconf_fill_devconf(skb, dev->ifindex,
+ &in_dev->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 (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
+ net->ipv4.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 (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
+ net->ipv4.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 devinet_copy_dflt_conf(struct net *net, int i)
+{
+ struct net_device *dev;
+
+ rcu_read_lock();
+ for_each_netdev_rcu(net, dev) {
+ struct in_device *in_dev;
+
+ in_dev = __in_dev_get_rcu(dev);
+ if (in_dev && !test_bit(i, in_dev->cnf.state))
+ in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
+ }
+ rcu_read_unlock();
+}
+
+/* called with RTNL locked */
+static void inet_forward_change(struct net *net)
+{
+ struct net_device *dev;
+ int on = IPV4_DEVCONF_ALL(net, FORWARDING);
+
+ IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
+ IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
+ inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv4.devconf_all);
+ inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_FORWARDING,
+ NETCONFA_IFINDEX_DEFAULT,
+ net->ipv4.devconf_dflt);
+
+ for_each_netdev(net, dev) {
+ struct in_device *in_dev;
+
+ if (on)
+ dev_disable_lro(dev);
+
+ in_dev = __in_dev_get_rtnl(dev);
+ if (in_dev) {
+ IN_DEV_CONF_SET(in_dev, FORWARDING, on);
+ inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_FORWARDING,
+ dev->ifindex, &in_dev->cnf);
+ }
+ }
+}
+
+static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
+{
+ if (cnf == net->ipv4.devconf_dflt)
+ return NETCONFA_IFINDEX_DEFAULT;
+ else if (cnf == net->ipv4.devconf_all)
+ return NETCONFA_IFINDEX_ALL;
+ else {
+ struct in_device *idev
+ = container_of(cnf, struct in_device, cnf);
+ return idev->dev->ifindex;
+ }
+}
+
+static int devinet_conf_proc(struct ctl_table *ctl, int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ int old_value = *(int *)ctl->data;
+ int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
+ int new_value = *(int *)ctl->data;
+
+ if (write) {
+ struct ipv4_devconf *cnf = ctl->extra1;
+ struct net *net = ctl->extra2;
+ int i = (int *)ctl->data - cnf->data;
+ int ifindex;
+
+ set_bit(i, cnf->state);
+
+ if (cnf == net->ipv4.devconf_dflt)
+ devinet_copy_dflt_conf(net, i);
+ if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
+ i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
+ if ((new_value == 0) && (old_value != 0))
+ rt_cache_flush(net);
+
+ if (i == IPV4_DEVCONF_BC_FORWARDING - 1 &&
+ new_value != old_value)
+ rt_cache_flush(net);
+
+ if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
+ new_value != old_value) {
+ ifindex = devinet_conf_ifindex(net, cnf);
+ inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_RP_FILTER,
+ ifindex, cnf);
+ }
+ if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
+ new_value != old_value) {
+ ifindex = devinet_conf_ifindex(net, cnf);
+ inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_PROXY_NEIGH,
+ ifindex, cnf);
+ }
+ if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
+ new_value != old_value) {
+ ifindex = devinet_conf_ifindex(net, cnf);
+ inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+ ifindex, cnf);
+ }
+ }
+
+ return ret;
+}
+
+static int devinet_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;
+ int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
+
+ if (write && *valp != val) {
+ struct net *net = ctl->extra2;
+
+ if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
+ if (!rtnl_trylock()) {
+ /* Restore the original values before restarting */
+ *valp = val;
+ *ppos = pos;
+ return restart_syscall();
+ }
+ if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
+ inet_forward_change(net);
+ } else {
+ struct ipv4_devconf *cnf = ctl->extra1;
+ struct in_device *idev =
+ container_of(cnf, struct in_device, cnf);
+ if (*valp)
+ dev_disable_lro(idev->dev);
+ inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_FORWARDING,
+ idev->dev->ifindex,
+ cnf);
+ }
+ rtnl_unlock();
+ rt_cache_flush(net);
+ } else
+ inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_FORWARDING,
+ NETCONFA_IFINDEX_DEFAULT,
+ net->ipv4.devconf_dflt);
+ }
+
+ return ret;
+}
+
+static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int val = *valp;
+ int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
+ struct net *net = ctl->extra2;
+
+ if (write && *valp != val)
+ rt_cache_flush(net);
+
+ return ret;
+}
+
+#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
+ { \
+ .procname = name, \
+ .data = ipv4_devconf.data + \
+ IPV4_DEVCONF_ ## attr - 1, \
+ .maxlen = sizeof(int), \
+ .mode = mval, \
+ .proc_handler = proc, \
+ .extra1 = &ipv4_devconf, \
+ }
+
+#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
+ DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
+
+#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
+ DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
+
+#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
+ DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
+
+#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
+ DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
+
+static struct devinet_sysctl_table {
+ struct ctl_table_header *sysctl_header;
+ struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
+} devinet_sysctl = {
+ .devinet_vars = {
+ DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
+ devinet_sysctl_forward),
+ DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
+ DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"),
+
+ DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
+ DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
+ DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
+ DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
+ DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
+ DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
+ "accept_source_route"),
+ DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
+ DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
+ DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
+ DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
+ DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
+ DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
+ DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
+ DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
+ DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
+ DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
+ DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
+ DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
+ DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
+ DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
+ "force_igmp_version"),
+ DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
+ "igmpv2_unsolicited_report_interval"),
+ DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
+ "igmpv3_unsolicited_report_interval"),
+ DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
+ "ignore_routes_with_linkdown"),
+ DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
+ "drop_gratuitous_arp"),
+
+ DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
+ DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
+ DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
+ "promote_secondaries"),
+ DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
+ "route_localnet"),
+ DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
+ "drop_unicast_in_l2_multicast"),
+ },
+};
+
+static int __devinet_sysctl_register(struct net *net, char *dev_name,
+ int ifindex, struct ipv4_devconf *p)
+{
+ int i;
+ struct devinet_sysctl_table *t;
+ char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
+
+ t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
+ if (!t)
+ goto out;
+
+ for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
+ t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
+ t->devinet_vars[i].extra1 = p;
+ t->devinet_vars[i].extra2 = net;
+ }
+
+ snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
+
+ t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
+ if (!t->sysctl_header)
+ goto free;
+
+ p->sysctl = t;
+
+ inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
+ ifindex, p);
+ return 0;
+
+free:
+ kfree(t);
+out:
+ return -ENOBUFS;
+}
+
+static void __devinet_sysctl_unregister(struct net *net,
+ struct ipv4_devconf *cnf, int ifindex)
+{
+ struct devinet_sysctl_table *t = cnf->sysctl;
+
+ if (t) {
+ cnf->sysctl = NULL;
+ unregister_net_sysctl_table(t->sysctl_header);
+ kfree(t);
+ }
+
+ inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
+}
+
+static int devinet_sysctl_register(struct in_device *idev)
+{
+ int err;
+
+ if (!sysctl_dev_name_is_allowed(idev->dev->name))
+ return -EINVAL;
+
+ err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
+ if (err)
+ return err;
+ err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
+ idev->dev->ifindex, &idev->cnf);
+ if (err)
+ neigh_sysctl_unregister(idev->arp_parms);
+ return err;
+}
+
+static void devinet_sysctl_unregister(struct in_device *idev)
+{
+ struct net *net = dev_net(idev->dev);
+
+ __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
+ neigh_sysctl_unregister(idev->arp_parms);
+}
+
+static struct ctl_table ctl_forward_entry[] = {
+ {
+ .procname = "ip_forward",
+ .data = &ipv4_devconf.data[
+ IPV4_DEVCONF_FORWARDING - 1],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = devinet_sysctl_forward,
+ .extra1 = &ipv4_devconf,
+ .extra2 = &init_net,
+ },
+ { },
+};
+#endif
+
+static __net_init int devinet_init_net(struct net *net)
+{
+ int err;
+ struct ipv4_devconf *all, *dflt;
+#ifdef CONFIG_SYSCTL
+ struct ctl_table *tbl = ctl_forward_entry;
+ struct ctl_table_header *forw_hdr;
+#endif
+
+ err = -ENOMEM;
+ all = &ipv4_devconf;
+ dflt = &ipv4_devconf_dflt;
+
+ if (!net_eq(net, &init_net)) {
+ all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
+ if (!all)
+ goto err_alloc_all;
+
+ dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
+ if (!dflt)
+ goto err_alloc_dflt;
+
+#ifdef CONFIG_SYSCTL
+ tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
+ if (!tbl)
+ goto err_alloc_ctl;
+
+ tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
+ tbl[0].extra1 = all;
+ tbl[0].extra2 = net;
+#endif
+ }
+
+#ifdef CONFIG_SYSCTL
+ err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
+ if (err < 0)
+ goto err_reg_all;
+
+ err = __devinet_sysctl_register(net, "default",
+ NETCONFA_IFINDEX_DEFAULT, dflt);
+ if (err < 0)
+ goto err_reg_dflt;
+
+ err = -ENOMEM;
+ forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
+ if (!forw_hdr)
+ goto err_reg_ctl;
+ net->ipv4.forw_hdr = forw_hdr;
+#endif
+
+ net->ipv4.devconf_all = all;
+ net->ipv4.devconf_dflt = dflt;
+ return 0;
+
+#ifdef CONFIG_SYSCTL
+err_reg_ctl:
+ __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
+err_reg_dflt:
+ __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
+err_reg_all:
+ if (tbl != ctl_forward_entry)
+ kfree(tbl);
+err_alloc_ctl:
+#endif
+ if (dflt != &ipv4_devconf_dflt)
+ kfree(dflt);
+err_alloc_dflt:
+ if (all != &ipv4_devconf)
+ kfree(all);
+err_alloc_all:
+ return err;
+}
+
+static __net_exit void devinet_exit_net(struct net *net)
+{
+#ifdef CONFIG_SYSCTL
+ struct ctl_table *tbl;
+
+ tbl = net->ipv4.forw_hdr->ctl_table_arg;
+ unregister_net_sysctl_table(net->ipv4.forw_hdr);
+ __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
+ NETCONFA_IFINDEX_DEFAULT);
+ __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
+ NETCONFA_IFINDEX_ALL);
+ kfree(tbl);
+#endif
+ kfree(net->ipv4.devconf_dflt);
+ kfree(net->ipv4.devconf_all);
+}
+
+static __net_initdata struct pernet_operations devinet_ops = {
+ .init = devinet_init_net,
+ .exit = devinet_exit_net,
+};
+
+static struct rtnl_af_ops inet_af_ops __read_mostly = {
+ .family = AF_INET,
+ .fill_link_af = inet_fill_link_af,
+ .get_link_af_size = inet_get_link_af_size,
+ .validate_link_af = inet_validate_link_af,
+ .set_link_af = inet_set_link_af,
+};
+
+void __init devinet_init(void)
+{
+ int i;
+
+ for (i = 0; i < IN4_ADDR_HSIZE; i++)
+ INIT_HLIST_HEAD(&inet_addr_lst[i]);
+
+ register_pernet_subsys(&devinet_ops);
+
+ register_gifconf(PF_INET, inet_gifconf);
+ register_netdevice_notifier(&ip_netdev_notifier);
+
+ queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
+
+ rtnl_af_register(&inet_af_ops);
+
+ rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
+ rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
+ rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
+ rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
+ inet_netconf_dump_devconf, 0);
+}