2 * NET3 IP device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
29 #include <asm/uaccess.h>
30 #include <linux/bitops.h>
31 #include <linux/capability.h>
32 #include <linux/module.h>
33 #include <linux/types.h>
34 #include <linux/kernel.h>
35 #include <linux/string.h>
37 #include <linux/socket.h>
38 #include <linux/sockios.h>
40 #include <linux/errno.h>
41 #include <linux/interrupt.h>
42 #include <linux/if_addr.h>
43 #include <linux/if_ether.h>
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <linux/etherdevice.h>
47 #include <linux/skbuff.h>
48 #include <linux/init.h>
49 #include <linux/notifier.h>
50 #include <linux/inetdevice.h>
51 #include <linux/igmp.h>
52 #include <linux/slab.h>
53 #include <linux/hash.h>
55 #include <linux/sysctl.h>
57 #include <linux/kmod.h>
58 #include <linux/netconf.h>
62 #include <net/route.h>
63 #include <net/ip_fib.h>
64 #include <net/rtnetlink.h>
65 #include <net/net_namespace.h>
66 #include <net/addrconf.h>
68 #include "fib_lookup.h"
70 static struct ipv4_devconf ipv4_devconf = {
72 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
75 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
79 static struct ipv4_devconf ipv4_devconf_dflt = {
81 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
82 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
83 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
85 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
89 #define IPV4_DEVCONF_DFLT(net, attr) \
90 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
92 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
93 [IFA_LOCAL] = { .type = NLA_U32 },
94 [IFA_ADDRESS] = { .type = NLA_U32 },
95 [IFA_BROADCAST] = { .type = NLA_U32 },
96 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
97 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
100 #define IN4_ADDR_HSIZE_SHIFT 8
101 #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
103 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
104 static DEFINE_SPINLOCK(inet_addr_hash_lock);
106 static u32 inet_addr_hash(struct net *net, __be32 addr)
108 u32 val = (__force u32) addr ^ net_hash_mix(net);
110 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
113 static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
115 u32 hash = inet_addr_hash(net, ifa->ifa_local);
117 spin_lock(&inet_addr_hash_lock);
118 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
119 spin_unlock(&inet_addr_hash_lock);
122 static void inet_hash_remove(struct in_ifaddr *ifa)
124 spin_lock(&inet_addr_hash_lock);
125 hlist_del_init_rcu(&ifa->hash);
126 spin_unlock(&inet_addr_hash_lock);
130 * __ip_dev_find - find the first device with a given source address.
131 * @net: the net namespace
132 * @addr: the source address
133 * @devref: if true, take a reference on the found device
135 * If a caller uses devref=false, it should be protected by RCU, or RTNL
137 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
139 u32 hash = inet_addr_hash(net, addr);
140 struct net_device *result = NULL;
141 struct in_ifaddr *ifa;
144 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
145 if (ifa->ifa_local == addr) {
146 struct net_device *dev = ifa->ifa_dev->dev;
148 if (!net_eq(dev_net(dev), net))
155 struct flowi4 fl4 = { .daddr = addr };
156 struct fib_result res = { 0 };
157 struct fib_table *local;
159 /* Fallback to FIB local table so that communication
160 * over loopback subnets work.
162 local = fib_get_table(net, RT_TABLE_LOCAL);
164 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
165 res.type == RTN_LOCAL)
166 result = FIB_RES_DEV(res);
168 if (result && devref)
173 EXPORT_SYMBOL(__ip_dev_find);
175 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
177 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
178 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
181 static void devinet_sysctl_register(struct in_device *idev);
182 static void devinet_sysctl_unregister(struct in_device *idev);
184 static void devinet_sysctl_register(struct in_device *idev)
187 static void devinet_sysctl_unregister(struct in_device *idev)
192 /* Locks all the inet devices. */
194 static struct in_ifaddr *inet_alloc_ifa(void)
196 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
199 static void inet_rcu_free_ifa(struct rcu_head *head)
201 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
203 in_dev_put(ifa->ifa_dev);
207 static void inet_free_ifa(struct in_ifaddr *ifa)
209 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
212 void in_dev_finish_destroy(struct in_device *idev)
214 struct net_device *dev = idev->dev;
216 WARN_ON(idev->ifa_list);
217 WARN_ON(idev->mc_list);
218 kfree(rcu_dereference_protected(idev->mc_hash, 1));
219 #ifdef NET_REFCNT_DEBUG
220 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
224 pr_err("Freeing alive in_device %p\n", idev);
228 EXPORT_SYMBOL(in_dev_finish_destroy);
230 static struct in_device *inetdev_init(struct net_device *dev)
232 struct in_device *in_dev;
236 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
239 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
240 sizeof(in_dev->cnf));
241 in_dev->cnf.sysctl = NULL;
243 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
244 if (!in_dev->arp_parms)
246 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
247 dev_disable_lro(dev);
248 /* Reference in_dev->dev */
250 /* Account for reference dev->ip_ptr (below) */
253 devinet_sysctl_register(in_dev);
254 ip_mc_init_dev(in_dev);
255 if (dev->flags & IFF_UP)
258 /* we can receive as soon as ip_ptr is set -- do this last */
259 rcu_assign_pointer(dev->ip_ptr, in_dev);
268 static void in_dev_rcu_put(struct rcu_head *head)
270 struct in_device *idev = container_of(head, struct in_device, rcu_head);
274 static void inetdev_destroy(struct in_device *in_dev)
276 struct in_ifaddr *ifa;
277 struct net_device *dev;
285 ip_mc_destroy_dev(in_dev);
287 while ((ifa = in_dev->ifa_list) != NULL) {
288 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
292 RCU_INIT_POINTER(dev->ip_ptr, NULL);
294 devinet_sysctl_unregister(in_dev);
295 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
298 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
301 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
304 for_primary_ifa(in_dev) {
305 if (inet_ifa_match(a, ifa)) {
306 if (!b || inet_ifa_match(b, ifa)) {
311 } endfor_ifa(in_dev);
316 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
317 int destroy, struct nlmsghdr *nlh, u32 portid)
319 struct in_ifaddr *promote = NULL;
320 struct in_ifaddr *ifa, *ifa1 = *ifap;
321 struct in_ifaddr *last_prim = in_dev->ifa_list;
322 struct in_ifaddr *prev_prom = NULL;
323 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
327 /* 1. Deleting primary ifaddr forces deletion all secondaries
328 * unless alias promotion is set
331 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
332 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
334 while ((ifa = *ifap1) != NULL) {
335 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
336 ifa1->ifa_scope <= ifa->ifa_scope)
339 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
340 ifa1->ifa_mask != ifa->ifa_mask ||
341 !inet_ifa_match(ifa1->ifa_address, ifa)) {
342 ifap1 = &ifa->ifa_next;
348 inet_hash_remove(ifa);
349 *ifap1 = ifa->ifa_next;
351 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
352 blocking_notifier_call_chain(&inetaddr_chain,
362 /* On promotion all secondaries from subnet are changing
363 * the primary IP, we must remove all their routes silently
364 * and later to add them back with new prefsrc. Do this
365 * while all addresses are on the device list.
367 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
368 if (ifa1->ifa_mask == ifa->ifa_mask &&
369 inet_ifa_match(ifa1->ifa_address, ifa))
370 fib_del_ifaddr(ifa, ifa1);
375 *ifap = ifa1->ifa_next;
376 inet_hash_remove(ifa1);
378 /* 3. Announce address deletion */
380 /* Send message first, then call notifier.
381 At first sight, FIB update triggered by notifier
382 will refer to already deleted ifaddr, that could confuse
383 netlink listeners. It is not true: look, gated sees
384 that route deleted and if it still thinks that ifaddr
385 is valid, it will try to restore deleted routes... Grr.
386 So that, this order is correct.
388 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
389 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
392 struct in_ifaddr *next_sec = promote->ifa_next;
395 prev_prom->ifa_next = promote->ifa_next;
396 promote->ifa_next = last_prim->ifa_next;
397 last_prim->ifa_next = promote;
400 promote->ifa_flags &= ~IFA_F_SECONDARY;
401 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
402 blocking_notifier_call_chain(&inetaddr_chain,
404 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
405 if (ifa1->ifa_mask != ifa->ifa_mask ||
406 !inet_ifa_match(ifa1->ifa_address, ifa))
416 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
419 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
422 static void check_lifetime(struct work_struct *work);
424 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
426 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
429 struct in_device *in_dev = ifa->ifa_dev;
430 struct in_ifaddr *ifa1, **ifap, **last_primary;
434 if (!ifa->ifa_local) {
439 ifa->ifa_flags &= ~IFA_F_SECONDARY;
440 last_primary = &in_dev->ifa_list;
442 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
443 ifap = &ifa1->ifa_next) {
444 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
445 ifa->ifa_scope <= ifa1->ifa_scope)
446 last_primary = &ifa1->ifa_next;
447 if (ifa1->ifa_mask == ifa->ifa_mask &&
448 inet_ifa_match(ifa1->ifa_address, ifa)) {
449 if (ifa1->ifa_local == ifa->ifa_local) {
453 if (ifa1->ifa_scope != ifa->ifa_scope) {
457 ifa->ifa_flags |= IFA_F_SECONDARY;
461 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
462 net_srandom(ifa->ifa_local);
466 ifa->ifa_next = *ifap;
469 inet_hash_insert(dev_net(in_dev->dev), ifa);
471 cancel_delayed_work(&check_lifetime_work);
472 schedule_delayed_work(&check_lifetime_work, 0);
474 /* Send message first, then call notifier.
475 Notifier will trigger FIB update, so that
476 listeners of netlink will know about new ifaddr */
477 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
478 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
483 static int inet_insert_ifa(struct in_ifaddr *ifa)
485 return __inet_insert_ifa(ifa, NULL, 0);
488 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
490 struct in_device *in_dev = __in_dev_get_rtnl(dev);
498 ipv4_devconf_setall(in_dev);
499 if (ifa->ifa_dev != in_dev) {
500 WARN_ON(ifa->ifa_dev);
502 ifa->ifa_dev = in_dev;
504 if (ipv4_is_loopback(ifa->ifa_local))
505 ifa->ifa_scope = RT_SCOPE_HOST;
506 return inet_insert_ifa(ifa);
509 /* Caller must hold RCU or RTNL :
510 * We dont take a reference on found in_device
512 struct in_device *inetdev_by_index(struct net *net, int ifindex)
514 struct net_device *dev;
515 struct in_device *in_dev = NULL;
518 dev = dev_get_by_index_rcu(net, ifindex);
520 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
524 EXPORT_SYMBOL(inetdev_by_index);
526 /* Called only from RTNL semaphored context. No locks. */
528 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
533 for_primary_ifa(in_dev) {
534 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
536 } endfor_ifa(in_dev);
540 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
542 struct net *net = sock_net(skb->sk);
543 struct nlattr *tb[IFA_MAX+1];
544 struct in_device *in_dev;
545 struct ifaddrmsg *ifm;
546 struct in_ifaddr *ifa, **ifap;
551 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
555 ifm = nlmsg_data(nlh);
556 in_dev = inetdev_by_index(net, ifm->ifa_index);
557 if (in_dev == NULL) {
562 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
563 ifap = &ifa->ifa_next) {
565 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
568 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
571 if (tb[IFA_ADDRESS] &&
572 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
573 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
576 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
580 err = -EADDRNOTAVAIL;
585 #define INFINITY_LIFE_TIME 0xFFFFFFFF
587 static void check_lifetime(struct work_struct *work)
589 unsigned long now, next, next_sec, next_sched;
590 struct in_ifaddr *ifa;
591 struct hlist_node *n;
595 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
597 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
598 bool change_needed = false;
601 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
604 if (ifa->ifa_flags & IFA_F_PERMANENT)
607 /* We try to batch several events at once. */
608 age = (now - ifa->ifa_tstamp +
609 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
611 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
612 age >= ifa->ifa_valid_lft) {
613 change_needed = true;
614 } else if (ifa->ifa_preferred_lft ==
615 INFINITY_LIFE_TIME) {
617 } else if (age >= ifa->ifa_preferred_lft) {
618 if (time_before(ifa->ifa_tstamp +
619 ifa->ifa_valid_lft * HZ, next))
620 next = ifa->ifa_tstamp +
621 ifa->ifa_valid_lft * HZ;
623 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
624 change_needed = true;
625 } else if (time_before(ifa->ifa_tstamp +
626 ifa->ifa_preferred_lft * HZ,
628 next = ifa->ifa_tstamp +
629 ifa->ifa_preferred_lft * HZ;
636 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
639 if (ifa->ifa_flags & IFA_F_PERMANENT)
642 /* We try to batch several events at once. */
643 age = (now - ifa->ifa_tstamp +
644 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
646 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
647 age >= ifa->ifa_valid_lft) {
648 struct in_ifaddr **ifap;
650 for (ifap = &ifa->ifa_dev->ifa_list;
651 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
653 inet_del_ifa(ifa->ifa_dev,
658 } else if (ifa->ifa_preferred_lft !=
659 INFINITY_LIFE_TIME &&
660 age >= ifa->ifa_preferred_lft &&
661 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
662 ifa->ifa_flags |= IFA_F_DEPRECATED;
663 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
669 next_sec = round_jiffies_up(next);
672 /* If rounded timeout is accurate enough, accept it. */
673 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
674 next_sched = next_sec;
677 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
678 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
679 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
681 schedule_delayed_work(&check_lifetime_work, next_sched - now);
684 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
687 unsigned long timeout;
689 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
691 timeout = addrconf_timeout_fixup(valid_lft, HZ);
692 if (addrconf_finite_timeout(timeout))
693 ifa->ifa_valid_lft = timeout;
695 ifa->ifa_flags |= IFA_F_PERMANENT;
697 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
698 if (addrconf_finite_timeout(timeout)) {
700 ifa->ifa_flags |= IFA_F_DEPRECATED;
701 ifa->ifa_preferred_lft = timeout;
703 ifa->ifa_tstamp = jiffies;
704 if (!ifa->ifa_cstamp)
705 ifa->ifa_cstamp = ifa->ifa_tstamp;
708 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
709 __u32 *pvalid_lft, __u32 *pprefered_lft)
711 struct nlattr *tb[IFA_MAX+1];
712 struct in_ifaddr *ifa;
713 struct ifaddrmsg *ifm;
714 struct net_device *dev;
715 struct in_device *in_dev;
718 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
722 ifm = nlmsg_data(nlh);
724 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
727 dev = __dev_get_by_index(net, ifm->ifa_index);
732 in_dev = __in_dev_get_rtnl(dev);
737 ifa = inet_alloc_ifa();
740 * A potential indev allocation can be left alive, it stays
741 * assigned to its device and is destroy with it.
745 ipv4_devconf_setall(in_dev);
748 if (tb[IFA_ADDRESS] == NULL)
749 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
751 INIT_HLIST_NODE(&ifa->hash);
752 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
753 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
754 ifa->ifa_flags = ifm->ifa_flags;
755 ifa->ifa_scope = ifm->ifa_scope;
756 ifa->ifa_dev = in_dev;
758 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
759 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
761 if (tb[IFA_BROADCAST])
762 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
765 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
767 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
769 if (tb[IFA_CACHEINFO]) {
770 struct ifa_cacheinfo *ci;
772 ci = nla_data(tb[IFA_CACHEINFO]);
773 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
777 *pvalid_lft = ci->ifa_valid;
778 *pprefered_lft = ci->ifa_prefered;
789 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
791 struct in_device *in_dev = ifa->ifa_dev;
792 struct in_ifaddr *ifa1, **ifap;
797 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
798 ifap = &ifa1->ifa_next) {
799 if (ifa1->ifa_mask == ifa->ifa_mask &&
800 inet_ifa_match(ifa1->ifa_address, ifa) &&
801 ifa1->ifa_local == ifa->ifa_local)
807 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
809 struct net *net = sock_net(skb->sk);
810 struct in_ifaddr *ifa;
811 struct in_ifaddr *ifa_existing;
812 __u32 valid_lft = INFINITY_LIFE_TIME;
813 __u32 prefered_lft = INFINITY_LIFE_TIME;
817 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
821 ifa_existing = find_matching_ifa(ifa);
823 /* It would be best to check for !NLM_F_CREATE here but
824 * userspace alreay relies on not having to provide this.
826 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
827 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
831 if (nlh->nlmsg_flags & NLM_F_EXCL ||
832 !(nlh->nlmsg_flags & NLM_F_REPLACE))
835 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
836 cancel_delayed_work(&check_lifetime_work);
837 schedule_delayed_work(&check_lifetime_work, 0);
838 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
839 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
845 * Determine a default network mask, based on the IP address.
848 static int inet_abc_len(__be32 addr)
850 int rc = -1; /* Something else, probably a multicast. */
852 if (ipv4_is_zeronet(addr))
855 __u32 haddr = ntohl(addr);
857 if (IN_CLASSA(haddr))
859 else if (IN_CLASSB(haddr))
861 else if (IN_CLASSC(haddr))
869 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
872 struct sockaddr_in sin_orig;
873 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
874 struct in_device *in_dev;
875 struct in_ifaddr **ifap = NULL;
876 struct in_ifaddr *ifa = NULL;
877 struct net_device *dev;
880 int tryaddrmatch = 0;
883 * Fetch the caller's info block into kernel space
886 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
888 ifr.ifr_name[IFNAMSIZ - 1] = 0;
890 /* save original address for comparison */
891 memcpy(&sin_orig, sin, sizeof(*sin));
893 colon = strchr(ifr.ifr_name, ':');
897 dev_load(net, ifr.ifr_name);
900 case SIOCGIFADDR: /* Get interface address */
901 case SIOCGIFBRDADDR: /* Get the broadcast address */
902 case SIOCGIFDSTADDR: /* Get the destination address */
903 case SIOCGIFNETMASK: /* Get the netmask for the interface */
904 /* Note that these ioctls will not sleep,
905 so that we do not impose a lock.
906 One day we will be forced to put shlock here (I mean SMP)
908 tryaddrmatch = (sin_orig.sin_family == AF_INET);
909 memset(sin, 0, sizeof(*sin));
910 sin->sin_family = AF_INET;
915 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
918 case SIOCSIFADDR: /* Set interface address (and family) */
919 case SIOCSIFBRDADDR: /* Set the broadcast address */
920 case SIOCSIFDSTADDR: /* Set the destination address */
921 case SIOCSIFNETMASK: /* Set the netmask for the interface */
923 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
926 if (sin->sin_family != AF_INET)
937 dev = __dev_get_by_name(net, ifr.ifr_name);
944 in_dev = __in_dev_get_rtnl(dev);
947 /* Matthias Andree */
948 /* compare label and address (4.4BSD style) */
949 /* note: we only do this for a limited set of ioctls
950 and only if the original address family was AF_INET.
951 This is checked above. */
952 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
953 ifap = &ifa->ifa_next) {
954 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
955 sin_orig.sin_addr.s_addr ==
961 /* we didn't get a match, maybe the application is
962 4.3BSD-style and passed in junk so we fall back to
963 comparing just the label */
965 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
966 ifap = &ifa->ifa_next)
967 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
972 ret = -EADDRNOTAVAIL;
973 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
977 case SIOCGIFADDR: /* Get interface address */
978 sin->sin_addr.s_addr = ifa->ifa_local;
981 case SIOCGIFBRDADDR: /* Get the broadcast address */
982 sin->sin_addr.s_addr = ifa->ifa_broadcast;
985 case SIOCGIFDSTADDR: /* Get the destination address */
986 sin->sin_addr.s_addr = ifa->ifa_address;
989 case SIOCGIFNETMASK: /* Get the netmask for the interface */
990 sin->sin_addr.s_addr = ifa->ifa_mask;
995 ret = -EADDRNOTAVAIL;
999 if (!(ifr.ifr_flags & IFF_UP))
1000 inet_del_ifa(in_dev, ifap, 1);
1003 ret = dev_change_flags(dev, ifr.ifr_flags);
1006 case SIOCSIFADDR: /* Set interface address (and family) */
1008 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1013 ifa = inet_alloc_ifa();
1016 INIT_HLIST_NODE(&ifa->hash);
1018 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1020 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1023 if (ifa->ifa_local == sin->sin_addr.s_addr)
1025 inet_del_ifa(in_dev, ifap, 0);
1026 ifa->ifa_broadcast = 0;
1030 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1032 if (!(dev->flags & IFF_POINTOPOINT)) {
1033 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1034 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1035 if ((dev->flags & IFF_BROADCAST) &&
1036 ifa->ifa_prefixlen < 31)
1037 ifa->ifa_broadcast = ifa->ifa_address |
1040 ifa->ifa_prefixlen = 32;
1041 ifa->ifa_mask = inet_make_mask(32);
1043 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1044 ret = inet_set_ifa(dev, ifa);
1047 case SIOCSIFBRDADDR: /* Set the broadcast address */
1049 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1050 inet_del_ifa(in_dev, ifap, 0);
1051 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1052 inet_insert_ifa(ifa);
1056 case SIOCSIFDSTADDR: /* Set the destination address */
1058 if (ifa->ifa_address == sin->sin_addr.s_addr)
1061 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1064 inet_del_ifa(in_dev, ifap, 0);
1065 ifa->ifa_address = sin->sin_addr.s_addr;
1066 inet_insert_ifa(ifa);
1069 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1072 * The mask we set must be legal.
1075 if (bad_mask(sin->sin_addr.s_addr, 0))
1078 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1079 __be32 old_mask = ifa->ifa_mask;
1080 inet_del_ifa(in_dev, ifap, 0);
1081 ifa->ifa_mask = sin->sin_addr.s_addr;
1082 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1084 /* See if current broadcast address matches
1085 * with current netmask, then recalculate
1086 * the broadcast address. Otherwise it's a
1087 * funny address, so don't touch it since
1088 * the user seems to know what (s)he's doing...
1090 if ((dev->flags & IFF_BROADCAST) &&
1091 (ifa->ifa_prefixlen < 31) &&
1092 (ifa->ifa_broadcast ==
1093 (ifa->ifa_local|~old_mask))) {
1094 ifa->ifa_broadcast = (ifa->ifa_local |
1095 ~sin->sin_addr.s_addr);
1097 inet_insert_ifa(ifa);
1107 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1111 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1113 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1114 struct in_ifaddr *ifa;
1121 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1123 done += sizeof(ifr);
1126 if (len < (int) sizeof(ifr))
1128 memset(&ifr, 0, sizeof(struct ifreq));
1130 strcpy(ifr.ifr_name, ifa->ifa_label);
1132 strcpy(ifr.ifr_name, dev->name);
1134 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1135 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1138 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1142 buf += sizeof(struct ifreq);
1143 len -= sizeof(struct ifreq);
1144 done += sizeof(struct ifreq);
1150 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1153 struct in_device *in_dev;
1154 struct net *net = dev_net(dev);
1157 in_dev = __in_dev_get_rcu(dev);
1161 for_primary_ifa(in_dev) {
1162 if (ifa->ifa_scope > scope)
1164 if (!dst || inet_ifa_match(dst, ifa)) {
1165 addr = ifa->ifa_local;
1169 addr = ifa->ifa_local;
1170 } endfor_ifa(in_dev);
1176 /* Not loopback addresses on loopback should be preferred
1177 in this case. It is importnat that lo is the first interface
1180 for_each_netdev_rcu(net, dev) {
1181 in_dev = __in_dev_get_rcu(dev);
1185 for_primary_ifa(in_dev) {
1186 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1187 ifa->ifa_scope <= scope) {
1188 addr = ifa->ifa_local;
1191 } endfor_ifa(in_dev);
1197 EXPORT_SYMBOL(inet_select_addr);
1199 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1200 __be32 local, int scope)
1207 (local == ifa->ifa_local || !local) &&
1208 ifa->ifa_scope <= scope) {
1209 addr = ifa->ifa_local;
1214 same = (!local || inet_ifa_match(local, ifa)) &&
1215 (!dst || inet_ifa_match(dst, ifa));
1219 /* Is the selected addr into dst subnet? */
1220 if (inet_ifa_match(addr, ifa))
1222 /* No, then can we use new local src? */
1223 if (ifa->ifa_scope <= scope) {
1224 addr = ifa->ifa_local;
1227 /* search for large dst subnet for addr */
1231 } endfor_ifa(in_dev);
1233 return same ? addr : 0;
1237 * Confirm that local IP address exists using wildcards:
1238 * - in_dev: only on this interface, 0=any interface
1239 * - dst: only in the same subnet as dst, 0=any dst
1240 * - local: address, 0=autoselect the local address
1241 * - scope: maximum allowed scope value for the local address
1243 __be32 inet_confirm_addr(struct in_device *in_dev,
1244 __be32 dst, __be32 local, int scope)
1247 struct net_device *dev;
1250 if (scope != RT_SCOPE_LINK)
1251 return confirm_addr_indev(in_dev, dst, local, scope);
1253 net = dev_net(in_dev->dev);
1255 for_each_netdev_rcu(net, dev) {
1256 in_dev = __in_dev_get_rcu(dev);
1258 addr = confirm_addr_indev(in_dev, dst, local, scope);
1267 EXPORT_SYMBOL(inet_confirm_addr);
1273 int register_inetaddr_notifier(struct notifier_block *nb)
1275 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1277 EXPORT_SYMBOL(register_inetaddr_notifier);
1279 int unregister_inetaddr_notifier(struct notifier_block *nb)
1281 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1283 EXPORT_SYMBOL(unregister_inetaddr_notifier);
1285 /* Rename ifa_labels for a device name change. Make some effort to preserve
1286 * existing alias numbering and to create unique labels if possible.
1288 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1290 struct in_ifaddr *ifa;
1293 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1294 char old[IFNAMSIZ], *dot;
1296 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1297 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1300 dot = strchr(old, ':');
1302 sprintf(old, ":%d", named);
1305 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1306 strcat(ifa->ifa_label, dot);
1308 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1310 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1314 static bool inetdev_valid_mtu(unsigned int mtu)
1319 static void inetdev_send_gratuitous_arp(struct net_device *dev,
1320 struct in_device *in_dev)
1323 struct in_ifaddr *ifa;
1325 for (ifa = in_dev->ifa_list; ifa;
1326 ifa = ifa->ifa_next) {
1327 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1328 ifa->ifa_local, dev,
1329 ifa->ifa_local, NULL,
1330 dev->dev_addr, NULL);
1334 /* Called only under RTNL semaphore */
1336 static int inetdev_event(struct notifier_block *this, unsigned long event,
1339 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1340 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1345 if (event == NETDEV_REGISTER) {
1346 in_dev = inetdev_init(dev);
1348 return notifier_from_errno(-ENOMEM);
1349 if (dev->flags & IFF_LOOPBACK) {
1350 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1351 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1353 } else if (event == NETDEV_CHANGEMTU) {
1354 /* Re-enabling IP */
1355 if (inetdev_valid_mtu(dev->mtu))
1356 in_dev = inetdev_init(dev);
1362 case NETDEV_REGISTER:
1363 pr_debug("%s: bug\n", __func__);
1364 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1367 if (!inetdev_valid_mtu(dev->mtu))
1369 if (dev->flags & IFF_LOOPBACK) {
1370 struct in_ifaddr *ifa = inet_alloc_ifa();
1373 INIT_HLIST_NODE(&ifa->hash);
1375 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1376 ifa->ifa_prefixlen = 8;
1377 ifa->ifa_mask = inet_make_mask(8);
1378 in_dev_hold(in_dev);
1379 ifa->ifa_dev = in_dev;
1380 ifa->ifa_scope = RT_SCOPE_HOST;
1381 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1382 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1383 INFINITY_LIFE_TIME);
1384 inet_insert_ifa(ifa);
1389 case NETDEV_CHANGEADDR:
1390 if (!IN_DEV_ARP_NOTIFY(in_dev))
1393 case NETDEV_NOTIFY_PEERS:
1394 /* Send gratuitous ARP to notify of link change */
1395 inetdev_send_gratuitous_arp(dev, in_dev);
1400 case NETDEV_PRE_TYPE_CHANGE:
1401 ip_mc_unmap(in_dev);
1403 case NETDEV_POST_TYPE_CHANGE:
1404 ip_mc_remap(in_dev);
1406 case NETDEV_CHANGEMTU:
1407 if (inetdev_valid_mtu(dev->mtu))
1409 /* disable IP when MTU is not enough */
1410 case NETDEV_UNREGISTER:
1411 inetdev_destroy(in_dev);
1413 case NETDEV_CHANGENAME:
1414 /* Do not notify about label change, this event is
1415 * not interesting to applications using netlink.
1417 inetdev_changename(dev, in_dev);
1419 devinet_sysctl_unregister(in_dev);
1420 devinet_sysctl_register(in_dev);
1427 static struct notifier_block ip_netdev_notifier = {
1428 .notifier_call = inetdev_event,
1431 static size_t inet_nlmsg_size(void)
1433 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1434 + nla_total_size(4) /* IFA_ADDRESS */
1435 + nla_total_size(4) /* IFA_LOCAL */
1436 + nla_total_size(4) /* IFA_BROADCAST */
1437 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1440 static inline u32 cstamp_delta(unsigned long cstamp)
1442 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1445 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1446 unsigned long tstamp, u32 preferred, u32 valid)
1448 struct ifa_cacheinfo ci;
1450 ci.cstamp = cstamp_delta(cstamp);
1451 ci.tstamp = cstamp_delta(tstamp);
1452 ci.ifa_prefered = preferred;
1453 ci.ifa_valid = valid;
1455 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1458 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1459 u32 portid, u32 seq, int event, unsigned int flags)
1461 struct ifaddrmsg *ifm;
1462 struct nlmsghdr *nlh;
1463 u32 preferred, valid;
1465 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
1469 ifm = nlmsg_data(nlh);
1470 ifm->ifa_family = AF_INET;
1471 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1472 ifm->ifa_flags = ifa->ifa_flags;
1473 ifm->ifa_scope = ifa->ifa_scope;
1474 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1476 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1477 preferred = ifa->ifa_preferred_lft;
1478 valid = ifa->ifa_valid_lft;
1479 if (preferred != INFINITY_LIFE_TIME) {
1480 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1482 if (preferred > tval)
1486 if (valid != INFINITY_LIFE_TIME) {
1494 preferred = INFINITY_LIFE_TIME;
1495 valid = INFINITY_LIFE_TIME;
1497 if ((ifa->ifa_address &&
1498 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1500 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1501 (ifa->ifa_broadcast &&
1502 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1503 (ifa->ifa_label[0] &&
1504 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1505 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1507 goto nla_put_failure;
1509 return nlmsg_end(skb, nlh);
1512 nlmsg_cancel(skb, nlh);
1516 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1518 struct net *net = sock_net(skb->sk);
1521 int ip_idx, s_ip_idx;
1522 struct net_device *dev;
1523 struct in_device *in_dev;
1524 struct in_ifaddr *ifa;
1525 struct hlist_head *head;
1528 s_idx = idx = cb->args[1];
1529 s_ip_idx = ip_idx = cb->args[2];
1531 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1533 head = &net->dev_index_head[h];
1535 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1537 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1540 if (h > s_h || idx > s_idx)
1542 in_dev = __in_dev_get_rcu(dev);
1546 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1547 ifa = ifa->ifa_next, ip_idx++) {
1548 if (ip_idx < s_ip_idx)
1550 if (inet_fill_ifaddr(skb, ifa,
1551 NETLINK_CB(cb->skb).portid,
1553 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1557 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1568 cb->args[2] = ip_idx;
1573 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1576 struct sk_buff *skb;
1577 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1581 net = dev_net(ifa->ifa_dev->dev);
1582 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1586 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
1588 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1589 WARN_ON(err == -EMSGSIZE);
1593 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1597 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1600 static size_t inet_get_link_af_size(const struct net_device *dev)
1602 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1607 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1610 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1612 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1619 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1623 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1624 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1629 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1630 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1633 static int inet_validate_link_af(const struct net_device *dev,
1634 const struct nlattr *nla)
1636 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1639 if (dev && !__in_dev_get_rtnl(dev))
1640 return -EAFNOSUPPORT;
1642 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1646 if (tb[IFLA_INET_CONF]) {
1647 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1648 int cfgid = nla_type(a);
1653 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1661 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1663 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1664 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1668 return -EAFNOSUPPORT;
1670 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1673 if (tb[IFLA_INET_CONF]) {
1674 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1675 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1681 static int inet_netconf_msgsize_devconf(int type)
1683 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1684 + nla_total_size(4); /* NETCONFA_IFINDEX */
1686 /* type -1 is used for ALL */
1687 if (type == -1 || type == NETCONFA_FORWARDING)
1688 size += nla_total_size(4);
1689 if (type == -1 || type == NETCONFA_RP_FILTER)
1690 size += nla_total_size(4);
1691 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1692 size += nla_total_size(4);
1697 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1698 struct ipv4_devconf *devconf, u32 portid,
1699 u32 seq, int event, unsigned int flags,
1702 struct nlmsghdr *nlh;
1703 struct netconfmsg *ncm;
1705 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1710 ncm = nlmsg_data(nlh);
1711 ncm->ncm_family = AF_INET;
1713 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1714 goto nla_put_failure;
1716 /* type -1 is used for ALL */
1717 if ((type == -1 || type == NETCONFA_FORWARDING) &&
1718 nla_put_s32(skb, NETCONFA_FORWARDING,
1719 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1720 goto nla_put_failure;
1721 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1722 nla_put_s32(skb, NETCONFA_RP_FILTER,
1723 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1724 goto nla_put_failure;
1725 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1726 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1727 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1728 goto nla_put_failure;
1730 return nlmsg_end(skb, nlh);
1733 nlmsg_cancel(skb, nlh);
1737 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1738 struct ipv4_devconf *devconf)
1740 struct sk_buff *skb;
1743 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1747 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1748 RTM_NEWNETCONF, 0, type);
1750 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1751 WARN_ON(err == -EMSGSIZE);
1755 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1759 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1762 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1763 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1764 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
1765 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
1768 static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1769 struct nlmsghdr *nlh)
1771 struct net *net = sock_net(in_skb->sk);
1772 struct nlattr *tb[NETCONFA_MAX+1];
1773 struct netconfmsg *ncm;
1774 struct sk_buff *skb;
1775 struct ipv4_devconf *devconf;
1776 struct in_device *in_dev;
1777 struct net_device *dev;
1781 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1782 devconf_ipv4_policy);
1787 if (!tb[NETCONFA_IFINDEX])
1790 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1792 case NETCONFA_IFINDEX_ALL:
1793 devconf = net->ipv4.devconf_all;
1795 case NETCONFA_IFINDEX_DEFAULT:
1796 devconf = net->ipv4.devconf_dflt;
1799 dev = __dev_get_by_index(net, ifindex);
1802 in_dev = __in_dev_get_rtnl(dev);
1805 devconf = &in_dev->cnf;
1810 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1814 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1815 NETLINK_CB(in_skb).portid,
1816 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1819 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1820 WARN_ON(err == -EMSGSIZE);
1824 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1829 static int inet_netconf_dump_devconf(struct sk_buff *skb,
1830 struct netlink_callback *cb)
1832 struct net *net = sock_net(skb->sk);
1835 struct net_device *dev;
1836 struct in_device *in_dev;
1837 struct hlist_head *head;
1840 s_idx = idx = cb->args[1];
1842 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1844 head = &net->dev_index_head[h];
1846 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1848 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1851 in_dev = __in_dev_get_rcu(dev);
1855 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1857 NETLINK_CB(cb->skb).portid,
1865 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1871 if (h == NETDEV_HASHENTRIES) {
1872 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1873 net->ipv4.devconf_all,
1874 NETLINK_CB(cb->skb).portid,
1876 RTM_NEWNETCONF, NLM_F_MULTI,
1882 if (h == NETDEV_HASHENTRIES + 1) {
1883 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1884 net->ipv4.devconf_dflt,
1885 NETLINK_CB(cb->skb).portid,
1887 RTM_NEWNETCONF, NLM_F_MULTI,
1900 #ifdef CONFIG_SYSCTL
1902 static void devinet_copy_dflt_conf(struct net *net, int i)
1904 struct net_device *dev;
1907 for_each_netdev_rcu(net, dev) {
1908 struct in_device *in_dev;
1910 in_dev = __in_dev_get_rcu(dev);
1911 if (in_dev && !test_bit(i, in_dev->cnf.state))
1912 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1917 /* called with RTNL locked */
1918 static void inet_forward_change(struct net *net)
1920 struct net_device *dev;
1921 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1923 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1924 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1925 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1926 NETCONFA_IFINDEX_ALL,
1927 net->ipv4.devconf_all);
1928 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1929 NETCONFA_IFINDEX_DEFAULT,
1930 net->ipv4.devconf_dflt);
1932 for_each_netdev(net, dev) {
1933 struct in_device *in_dev;
1935 dev_disable_lro(dev);
1937 in_dev = __in_dev_get_rcu(dev);
1939 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1940 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1941 dev->ifindex, &in_dev->cnf);
1947 static int devinet_conf_proc(struct ctl_table *ctl, int write,
1948 void __user *buffer,
1949 size_t *lenp, loff_t *ppos)
1951 int old_value = *(int *)ctl->data;
1952 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1953 int new_value = *(int *)ctl->data;
1956 struct ipv4_devconf *cnf = ctl->extra1;
1957 struct net *net = ctl->extra2;
1958 int i = (int *)ctl->data - cnf->data;
1960 set_bit(i, cnf->state);
1962 if (cnf == net->ipv4.devconf_dflt)
1963 devinet_copy_dflt_conf(net, i);
1964 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
1965 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
1966 if ((new_value == 0) && (old_value != 0))
1967 rt_cache_flush(net);
1968 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
1969 new_value != old_value) {
1972 if (cnf == net->ipv4.devconf_dflt)
1973 ifindex = NETCONFA_IFINDEX_DEFAULT;
1974 else if (cnf == net->ipv4.devconf_all)
1975 ifindex = NETCONFA_IFINDEX_ALL;
1977 struct in_device *idev =
1978 container_of(cnf, struct in_device,
1980 ifindex = idev->dev->ifindex;
1982 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
1990 static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
1991 void __user *buffer,
1992 size_t *lenp, loff_t *ppos)
1994 int *valp = ctl->data;
1997 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1999 if (write && *valp != val) {
2000 struct net *net = ctl->extra2;
2002 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2003 if (!rtnl_trylock()) {
2004 /* Restore the original values before restarting */
2007 return restart_syscall();
2009 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2010 inet_forward_change(net);
2012 struct ipv4_devconf *cnf = ctl->extra1;
2013 struct in_device *idev =
2014 container_of(cnf, struct in_device, cnf);
2016 dev_disable_lro(idev->dev);
2017 inet_netconf_notify_devconf(net,
2018 NETCONFA_FORWARDING,
2023 rt_cache_flush(net);
2025 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2026 NETCONFA_IFINDEX_DEFAULT,
2027 net->ipv4.devconf_dflt);
2033 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2034 void __user *buffer,
2035 size_t *lenp, loff_t *ppos)
2037 int *valp = ctl->data;
2039 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2040 struct net *net = ctl->extra2;
2042 if (write && *valp != val)
2043 rt_cache_flush(net);
2048 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2051 .data = ipv4_devconf.data + \
2052 IPV4_DEVCONF_ ## attr - 1, \
2053 .maxlen = sizeof(int), \
2055 .proc_handler = proc, \
2056 .extra1 = &ipv4_devconf, \
2059 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2060 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2062 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2063 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2065 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2066 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2068 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2069 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2071 static struct devinet_sysctl_table {
2072 struct ctl_table_header *sysctl_header;
2073 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2074 } devinet_sysctl = {
2076 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2077 devinet_sysctl_forward),
2078 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2080 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2081 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2082 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2083 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2084 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2085 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2086 "accept_source_route"),
2087 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2088 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2089 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2090 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2091 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2092 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2093 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2094 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2095 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2096 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2097 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2098 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2099 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2101 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2102 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2103 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
2104 "force_igmp_version"),
2105 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2106 "promote_secondaries"),
2107 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2112 static int __devinet_sysctl_register(struct net *net, char *dev_name,
2113 struct ipv4_devconf *p)
2116 struct devinet_sysctl_table *t;
2117 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2119 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2123 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2124 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2125 t->devinet_vars[i].extra1 = p;
2126 t->devinet_vars[i].extra2 = net;
2129 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2131 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2132 if (!t->sysctl_header)
2144 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2146 struct devinet_sysctl_table *t = cnf->sysctl;
2152 unregister_net_sysctl_table(t->sysctl_header);
2156 static void devinet_sysctl_register(struct in_device *idev)
2158 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
2159 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2163 static void devinet_sysctl_unregister(struct in_device *idev)
2165 __devinet_sysctl_unregister(&idev->cnf);
2166 neigh_sysctl_unregister(idev->arp_parms);
2169 static struct ctl_table ctl_forward_entry[] = {
2171 .procname = "ip_forward",
2172 .data = &ipv4_devconf.data[
2173 IPV4_DEVCONF_FORWARDING - 1],
2174 .maxlen = sizeof(int),
2176 .proc_handler = devinet_sysctl_forward,
2177 .extra1 = &ipv4_devconf,
2178 .extra2 = &init_net,
2184 static __net_init int devinet_init_net(struct net *net)
2187 struct ipv4_devconf *all, *dflt;
2188 #ifdef CONFIG_SYSCTL
2189 struct ctl_table *tbl = ctl_forward_entry;
2190 struct ctl_table_header *forw_hdr;
2194 all = &ipv4_devconf;
2195 dflt = &ipv4_devconf_dflt;
2197 if (!net_eq(net, &init_net)) {
2198 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2202 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2204 goto err_alloc_dflt;
2206 #ifdef CONFIG_SYSCTL
2207 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2211 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2212 tbl[0].extra1 = all;
2213 tbl[0].extra2 = net;
2217 #ifdef CONFIG_SYSCTL
2218 err = __devinet_sysctl_register(net, "all", all);
2222 err = __devinet_sysctl_register(net, "default", dflt);
2227 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2228 if (forw_hdr == NULL)
2230 net->ipv4.forw_hdr = forw_hdr;
2233 net->ipv4.devconf_all = all;
2234 net->ipv4.devconf_dflt = dflt;
2237 #ifdef CONFIG_SYSCTL
2239 __devinet_sysctl_unregister(dflt);
2241 __devinet_sysctl_unregister(all);
2243 if (tbl != ctl_forward_entry)
2247 if (dflt != &ipv4_devconf_dflt)
2250 if (all != &ipv4_devconf)
2256 static __net_exit void devinet_exit_net(struct net *net)
2258 #ifdef CONFIG_SYSCTL
2259 struct ctl_table *tbl;
2261 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2262 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2263 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2264 __devinet_sysctl_unregister(net->ipv4.devconf_all);
2267 kfree(net->ipv4.devconf_dflt);
2268 kfree(net->ipv4.devconf_all);
2271 static __net_initdata struct pernet_operations devinet_ops = {
2272 .init = devinet_init_net,
2273 .exit = devinet_exit_net,
2276 static struct rtnl_af_ops inet_af_ops = {
2278 .fill_link_af = inet_fill_link_af,
2279 .get_link_af_size = inet_get_link_af_size,
2280 .validate_link_af = inet_validate_link_af,
2281 .set_link_af = inet_set_link_af,
2284 void __init devinet_init(void)
2288 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2289 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2291 register_pernet_subsys(&devinet_ops);
2293 register_gifconf(PF_INET, inet_gifconf);
2294 register_netdevice_notifier(&ip_netdev_notifier);
2296 schedule_delayed_work(&check_lifetime_work, 0);
2298 rtnl_af_register(&inet_af_ops);
2300 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2301 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2302 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
2303 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2304 inet_netconf_dump_devconf, NULL);