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25#include <linux/uaccess.h>
26#include <linux/bitops.h>
27#include <linux/capability.h>
28#include <linux/module.h>
29#include <linux/types.h>
30#include <linux/kernel.h>
31#include <linux/sched/signal.h>
32#include <linux/string.h>
33#include <linux/mm.h>
34#include <linux/socket.h>
35#include <linux/sockios.h>
36#include <linux/in.h>
37#include <linux/errno.h>
38#include <linux/interrupt.h>
39#include <linux/if_addr.h>
40#include <linux/if_ether.h>
41#include <linux/inet.h>
42#include <linux/netdevice.h>
43#include <linux/etherdevice.h>
44#include <linux/skbuff.h>
45#include <linux/init.h>
46#include <linux/notifier.h>
47#include <linux/inetdevice.h>
48#include <linux/igmp.h>
49#include <linux/slab.h>
50#include <linux/hash.h>
51#ifdef CONFIG_SYSCTL
52#include <linux/sysctl.h>
53#endif
54#include <linux/kmod.h>
55#include <linux/netconf.h>
56
57#include <net/arp.h>
58#include <net/ip.h>
59#include <net/route.h>
60#include <net/ip_fib.h>
61#include <net/rtnetlink.h>
62#include <net/net_namespace.h>
63#include <net/addrconf.h>
64
65#define IPV6ONLY_FLAGS \
66 (IFA_F_NODAD | IFA_F_OPTIMISTIC | IFA_F_DADFAILED | \
67 IFA_F_HOMEADDRESS | IFA_F_TENTATIVE | \
68 IFA_F_MANAGETEMPADDR | IFA_F_STABLE_PRIVACY)
69
70static struct ipv4_devconf ipv4_devconf = {
71 .data = {
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,
76 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 ,
77 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 ,
78 },
79};
80
81static struct ipv4_devconf ipv4_devconf_dflt = {
82 .data = {
83 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
85 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
86 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
87 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
88 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 ,
89 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 ,
90 },
91};
92
93#define IPV4_DEVCONF_DFLT(net, attr) \
94 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
95
96static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
97 [IFA_LOCAL] = { .type = NLA_U32 },
98 [IFA_ADDRESS] = { .type = NLA_U32 },
99 [IFA_BROADCAST] = { .type = NLA_U32 },
100 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
101 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
102 [IFA_FLAGS] = { .type = NLA_U32 },
103 [IFA_RT_PRIORITY] = { .type = NLA_U32 },
104 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
105};
106
107struct inet_fill_args {
108 u32 portid;
109 u32 seq;
110 int event;
111 unsigned int flags;
112 int netnsid;
113 int ifindex;
114};
115
116#define IN4_ADDR_HSIZE_SHIFT 8
117#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
118
119static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
120
121static u32 inet_addr_hash(const struct net *net, __be32 addr)
122{
123 u32 val = (__force u32) addr ^ net_hash_mix(net);
124
125 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
126}
127
128static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
129{
130 u32 hash = inet_addr_hash(net, ifa->ifa_local);
131
132 ASSERT_RTNL();
133 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
134}
135
136static void inet_hash_remove(struct in_ifaddr *ifa)
137{
138 ASSERT_RTNL();
139 hlist_del_init_rcu(&ifa->hash);
140}
141
142
143
144
145
146
147
148
149
150struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
151{
152 struct net_device *result = NULL;
153 struct in_ifaddr *ifa;
154
155 rcu_read_lock();
156 ifa = inet_lookup_ifaddr_rcu(net, addr);
157 if (!ifa) {
158 struct flowi4 fl4 = { .daddr = addr };
159 struct fib_result res = { 0 };
160 struct fib_table *local;
161
162
163
164
165 local = fib_get_table(net, RT_TABLE_LOCAL);
166 if (local &&
167 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
168 res.type == RTN_LOCAL)
169 result = FIB_RES_DEV(res);
170 } else {
171 result = ifa->ifa_dev->dev;
172 }
173 if (result && devref)
174 dev_hold(result);
175 rcu_read_unlock();
176 return result;
177}
178EXPORT_SYMBOL(__ip_dev_find);
179
180
181struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
182{
183 u32 hash = inet_addr_hash(net, addr);
184 struct in_ifaddr *ifa;
185
186 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
187 if (ifa->ifa_local == addr &&
188 net_eq(dev_net(ifa->ifa_dev->dev), net))
189 return ifa;
190
191 return NULL;
192}
193
194static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
195
196static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
197static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
198static void inet_del_ifa(struct in_device *in_dev,
199 struct in_ifaddr __rcu **ifap,
200 int destroy);
201#ifdef CONFIG_SYSCTL
202static int devinet_sysctl_register(struct in_device *idev);
203static void devinet_sysctl_unregister(struct in_device *idev);
204#else
205static int devinet_sysctl_register(struct in_device *idev)
206{
207 return 0;
208}
209static void devinet_sysctl_unregister(struct in_device *idev)
210{
211}
212#endif
213
214
215
216static struct in_ifaddr *inet_alloc_ifa(void)
217{
218 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL_ACCOUNT);
219}
220
221static void inet_rcu_free_ifa(struct rcu_head *head)
222{
223 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
224 if (ifa->ifa_dev)
225 in_dev_put(ifa->ifa_dev);
226 kfree(ifa);
227}
228
229static void inet_free_ifa(struct in_ifaddr *ifa)
230{
231 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
232}
233
234void in_dev_finish_destroy(struct in_device *idev)
235{
236 struct net_device *dev = idev->dev;
237
238 WARN_ON(idev->ifa_list);
239 WARN_ON(idev->mc_list);
240 kfree(rcu_dereference_protected(idev->mc_hash, 1));
241#ifdef NET_REFCNT_DEBUG
242 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
243#endif
244 dev_put(dev);
245 if (!idev->dead)
246 pr_err("Freeing alive in_device %p\n", idev);
247 else
248 kfree(idev);
249}
250EXPORT_SYMBOL(in_dev_finish_destroy);
251
252static struct in_device *inetdev_init(struct net_device *dev)
253{
254 struct in_device *in_dev;
255 int err = -ENOMEM;
256
257 ASSERT_RTNL();
258
259 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
260 if (!in_dev)
261 goto out;
262 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
263 sizeof(in_dev->cnf));
264 in_dev->cnf.sysctl = NULL;
265 in_dev->dev = dev;
266 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
267 if (!in_dev->arp_parms)
268 goto out_kfree;
269 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
270 dev_disable_lro(dev);
271
272 dev_hold(dev);
273
274 refcount_set(&in_dev->refcnt, 1);
275
276 err = devinet_sysctl_register(in_dev);
277 if (err) {
278 in_dev->dead = 1;
279 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
280 in_dev_put(in_dev);
281 in_dev = NULL;
282 goto out;
283 }
284 ip_mc_init_dev(in_dev);
285 if (dev->flags & IFF_UP)
286 ip_mc_up(in_dev);
287
288
289 rcu_assign_pointer(dev->ip_ptr, in_dev);
290out:
291 return in_dev ?: ERR_PTR(err);
292out_kfree:
293 kfree(in_dev);
294 in_dev = NULL;
295 goto out;
296}
297
298static void in_dev_rcu_put(struct rcu_head *head)
299{
300 struct in_device *idev = container_of(head, struct in_device, rcu_head);
301 in_dev_put(idev);
302}
303
304static void inetdev_destroy(struct in_device *in_dev)
305{
306 struct net_device *dev;
307 struct in_ifaddr *ifa;
308
309 ASSERT_RTNL();
310
311 dev = in_dev->dev;
312
313 in_dev->dead = 1;
314
315 ip_mc_destroy_dev(in_dev);
316
317 while ((ifa = rtnl_dereference(in_dev->ifa_list)) != NULL) {
318 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
319 inet_free_ifa(ifa);
320 }
321
322 RCU_INIT_POINTER(dev->ip_ptr, NULL);
323
324 devinet_sysctl_unregister(in_dev);
325 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
326 arp_ifdown(dev);
327
328 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
329}
330
331int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
332{
333 const struct in_ifaddr *ifa;
334
335 rcu_read_lock();
336 in_dev_for_each_ifa_rcu(ifa, in_dev) {
337 if (inet_ifa_match(a, ifa)) {
338 if (!b || inet_ifa_match(b, ifa)) {
339 rcu_read_unlock();
340 return 1;
341 }
342 }
343 }
344 rcu_read_unlock();
345 return 0;
346}
347
348static void __inet_del_ifa(struct in_device *in_dev,
349 struct in_ifaddr __rcu **ifap,
350 int destroy, struct nlmsghdr *nlh, u32 portid)
351{
352 struct in_ifaddr *promote = NULL;
353 struct in_ifaddr *ifa, *ifa1;
354 struct in_ifaddr *last_prim;
355 struct in_ifaddr *prev_prom = NULL;
356 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
357
358 ASSERT_RTNL();
359
360 ifa1 = rtnl_dereference(*ifap);
361 last_prim = rtnl_dereference(in_dev->ifa_list);
362 if (in_dev->dead)
363 goto no_promotions;
364
365
366
367
368
369 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
370 struct in_ifaddr __rcu **ifap1 = &ifa1->ifa_next;
371
372 while ((ifa = rtnl_dereference(*ifap1)) != NULL) {
373 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
374 ifa1->ifa_scope <= ifa->ifa_scope)
375 last_prim = ifa;
376
377 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
378 ifa1->ifa_mask != ifa->ifa_mask ||
379 !inet_ifa_match(ifa1->ifa_address, ifa)) {
380 ifap1 = &ifa->ifa_next;
381 prev_prom = ifa;
382 continue;
383 }
384
385 if (!do_promote) {
386 inet_hash_remove(ifa);
387 *ifap1 = ifa->ifa_next;
388
389 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
390 blocking_notifier_call_chain(&inetaddr_chain,
391 NETDEV_DOWN, ifa);
392 inet_free_ifa(ifa);
393 } else {
394 promote = ifa;
395 break;
396 }
397 }
398 }
399
400
401
402
403
404
405 for (ifa = promote; ifa; ifa = rtnl_dereference(ifa->ifa_next)) {
406 if (ifa1->ifa_mask == ifa->ifa_mask &&
407 inet_ifa_match(ifa1->ifa_address, ifa))
408 fib_del_ifaddr(ifa, ifa1);
409 }
410
411no_promotions:
412
413
414 *ifap = ifa1->ifa_next;
415 inet_hash_remove(ifa1);
416
417
418
419
420
421
422
423
424
425
426
427 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
428 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
429
430 if (promote) {
431 struct in_ifaddr *next_sec;
432
433 next_sec = rtnl_dereference(promote->ifa_next);
434 if (prev_prom) {
435 struct in_ifaddr *last_sec;
436
437 rcu_assign_pointer(prev_prom->ifa_next, next_sec);
438
439 last_sec = rtnl_dereference(last_prim->ifa_next);
440 rcu_assign_pointer(promote->ifa_next, last_sec);
441 rcu_assign_pointer(last_prim->ifa_next, promote);
442 }
443
444 promote->ifa_flags &= ~IFA_F_SECONDARY;
445 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
446 blocking_notifier_call_chain(&inetaddr_chain,
447 NETDEV_UP, promote);
448 for (ifa = next_sec; ifa;
449 ifa = rtnl_dereference(ifa->ifa_next)) {
450 if (ifa1->ifa_mask != ifa->ifa_mask ||
451 !inet_ifa_match(ifa1->ifa_address, ifa))
452 continue;
453 fib_add_ifaddr(ifa);
454 }
455
456 }
457 if (destroy)
458 inet_free_ifa(ifa1);
459}
460
461static void inet_del_ifa(struct in_device *in_dev,
462 struct in_ifaddr __rcu **ifap,
463 int destroy)
464{
465 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
466}
467
468static void check_lifetime(struct work_struct *work);
469
470static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
471
472static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
473 u32 portid, struct netlink_ext_ack *extack)
474{
475 struct in_ifaddr __rcu **last_primary, **ifap;
476 struct in_device *in_dev = ifa->ifa_dev;
477 struct in_validator_info ivi;
478 struct in_ifaddr *ifa1;
479 int ret;
480
481 ASSERT_RTNL();
482
483 if (!ifa->ifa_local) {
484 inet_free_ifa(ifa);
485 return 0;
486 }
487
488 ifa->ifa_flags &= ~IFA_F_SECONDARY;
489 last_primary = &in_dev->ifa_list;
490
491
492 ifa->ifa_flags &= ~IPV6ONLY_FLAGS;
493
494 ifap = &in_dev->ifa_list;
495 ifa1 = rtnl_dereference(*ifap);
496
497 while (ifa1) {
498 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
499 ifa->ifa_scope <= ifa1->ifa_scope)
500 last_primary = &ifa1->ifa_next;
501 if (ifa1->ifa_mask == ifa->ifa_mask &&
502 inet_ifa_match(ifa1->ifa_address, ifa)) {
503 if (ifa1->ifa_local == ifa->ifa_local) {
504 inet_free_ifa(ifa);
505 return -EEXIST;
506 }
507 if (ifa1->ifa_scope != ifa->ifa_scope) {
508 inet_free_ifa(ifa);
509 return -EINVAL;
510 }
511 ifa->ifa_flags |= IFA_F_SECONDARY;
512 }
513
514 ifap = &ifa1->ifa_next;
515 ifa1 = rtnl_dereference(*ifap);
516 }
517
518
519
520
521
522
523
524
525 ivi.ivi_addr = ifa->ifa_address;
526 ivi.ivi_dev = ifa->ifa_dev;
527 ivi.extack = extack;
528 ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
529 NETDEV_UP, &ivi);
530 ret = notifier_to_errno(ret);
531 if (ret) {
532 inet_free_ifa(ifa);
533 return ret;
534 }
535
536 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
537 prandom_seed((__force u32) ifa->ifa_local);
538 ifap = last_primary;
539 }
540
541 rcu_assign_pointer(ifa->ifa_next, *ifap);
542 rcu_assign_pointer(*ifap, ifa);
543
544 inet_hash_insert(dev_net(in_dev->dev), ifa);
545
546 cancel_delayed_work(&check_lifetime_work);
547 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
548
549
550
551
552 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
553 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
554
555 return 0;
556}
557
558static int inet_insert_ifa(struct in_ifaddr *ifa)
559{
560 return __inet_insert_ifa(ifa, NULL, 0, NULL);
561}
562
563static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
564{
565 struct in_device *in_dev = __in_dev_get_rtnl(dev);
566
567 ASSERT_RTNL();
568
569 if (!in_dev) {
570 inet_free_ifa(ifa);
571 return -ENOBUFS;
572 }
573 ipv4_devconf_setall(in_dev);
574 neigh_parms_data_state_setall(in_dev->arp_parms);
575 if (ifa->ifa_dev != in_dev) {
576 WARN_ON(ifa->ifa_dev);
577 in_dev_hold(in_dev);
578 ifa->ifa_dev = in_dev;
579 }
580 if (ipv4_is_loopback(ifa->ifa_local))
581 ifa->ifa_scope = RT_SCOPE_HOST;
582 return inet_insert_ifa(ifa);
583}
584
585
586
587
588struct in_device *inetdev_by_index(struct net *net, int ifindex)
589{
590 struct net_device *dev;
591 struct in_device *in_dev = NULL;
592
593 rcu_read_lock();
594 dev = dev_get_by_index_rcu(net, ifindex);
595 if (dev)
596 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
597 rcu_read_unlock();
598 return in_dev;
599}
600EXPORT_SYMBOL(inetdev_by_index);
601
602
603
604struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
605 __be32 mask)
606{
607 struct in_ifaddr *ifa;
608
609 ASSERT_RTNL();
610
611 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
612 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
613 return ifa;
614 }
615 return NULL;
616}
617
618static int ip_mc_autojoin_config(struct net *net, bool join,
619 const struct in_ifaddr *ifa)
620{
621#if defined(CONFIG_IP_MULTICAST)
622 struct ip_mreqn mreq = {
623 .imr_multiaddr.s_addr = ifa->ifa_address,
624 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
625 };
626 struct sock *sk = net->ipv4.mc_autojoin_sk;
627 int ret;
628
629 ASSERT_RTNL();
630
631 lock_sock(sk);
632 if (join)
633 ret = ip_mc_join_group(sk, &mreq);
634 else
635 ret = ip_mc_leave_group(sk, &mreq);
636 release_sock(sk);
637
638 return ret;
639#else
640 return -EOPNOTSUPP;
641#endif
642}
643
644static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
645 struct netlink_ext_ack *extack)
646{
647 struct net *net = sock_net(skb->sk);
648 struct in_ifaddr __rcu **ifap;
649 struct nlattr *tb[IFA_MAX+1];
650 struct in_device *in_dev;
651 struct ifaddrmsg *ifm;
652 struct in_ifaddr *ifa;
653 int err;
654
655 ASSERT_RTNL();
656
657 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
658 ifa_ipv4_policy, extack);
659 if (err < 0)
660 goto errout;
661
662 ifm = nlmsg_data(nlh);
663 in_dev = inetdev_by_index(net, ifm->ifa_index);
664 if (!in_dev) {
665 err = -ENODEV;
666 goto errout;
667 }
668
669 for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL;
670 ifap = &ifa->ifa_next) {
671 if (tb[IFA_LOCAL] &&
672 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
673 continue;
674
675 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
676 continue;
677
678 if (tb[IFA_ADDRESS] &&
679 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
680 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
681 continue;
682
683 if (ipv4_is_multicast(ifa->ifa_address))
684 ip_mc_autojoin_config(net, false, ifa);
685 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
686 return 0;
687 }
688
689 err = -EADDRNOTAVAIL;
690errout:
691 return err;
692}
693
694#define INFINITY_LIFE_TIME 0xFFFFFFFF
695
696static void check_lifetime(struct work_struct *work)
697{
698 unsigned long now, next, next_sec, next_sched;
699 struct in_ifaddr *ifa;
700 struct hlist_node *n;
701 int i;
702
703 now = jiffies;
704 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
705
706 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
707 bool change_needed = false;
708
709 rcu_read_lock();
710 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
711 unsigned long age;
712
713 if (ifa->ifa_flags & IFA_F_PERMANENT)
714 continue;
715
716
717 age = (now - ifa->ifa_tstamp +
718 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
719
720 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
721 age >= ifa->ifa_valid_lft) {
722 change_needed = true;
723 } else if (ifa->ifa_preferred_lft ==
724 INFINITY_LIFE_TIME) {
725 continue;
726 } else if (age >= ifa->ifa_preferred_lft) {
727 if (time_before(ifa->ifa_tstamp +
728 ifa->ifa_valid_lft * HZ, next))
729 next = ifa->ifa_tstamp +
730 ifa->ifa_valid_lft * HZ;
731
732 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
733 change_needed = true;
734 } else if (time_before(ifa->ifa_tstamp +
735 ifa->ifa_preferred_lft * HZ,
736 next)) {
737 next = ifa->ifa_tstamp +
738 ifa->ifa_preferred_lft * HZ;
739 }
740 }
741 rcu_read_unlock();
742 if (!change_needed)
743 continue;
744 rtnl_lock();
745 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
746 unsigned long age;
747
748 if (ifa->ifa_flags & IFA_F_PERMANENT)
749 continue;
750
751
752 age = (now - ifa->ifa_tstamp +
753 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
754
755 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
756 age >= ifa->ifa_valid_lft) {
757 struct in_ifaddr __rcu **ifap;
758 struct in_ifaddr *tmp;
759
760 ifap = &ifa->ifa_dev->ifa_list;
761 tmp = rtnl_dereference(*ifap);
762 while (tmp) {
763 if (tmp == ifa) {
764 inet_del_ifa(ifa->ifa_dev,
765 ifap, 1);
766 break;
767 }
768 ifap = &tmp->ifa_next;
769 tmp = rtnl_dereference(*ifap);
770 }
771 } else if (ifa->ifa_preferred_lft !=
772 INFINITY_LIFE_TIME &&
773 age >= ifa->ifa_preferred_lft &&
774 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
775 ifa->ifa_flags |= IFA_F_DEPRECATED;
776 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
777 }
778 }
779 rtnl_unlock();
780 }
781
782 next_sec = round_jiffies_up(next);
783 next_sched = next;
784
785
786 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
787 next_sched = next_sec;
788
789 now = jiffies;
790
791 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
792 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
793
794 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
795 next_sched - now);
796}
797
798static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
799 __u32 prefered_lft)
800{
801 unsigned long timeout;
802
803 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
804
805 timeout = addrconf_timeout_fixup(valid_lft, HZ);
806 if (addrconf_finite_timeout(timeout))
807 ifa->ifa_valid_lft = timeout;
808 else
809 ifa->ifa_flags |= IFA_F_PERMANENT;
810
811 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
812 if (addrconf_finite_timeout(timeout)) {
813 if (timeout == 0)
814 ifa->ifa_flags |= IFA_F_DEPRECATED;
815 ifa->ifa_preferred_lft = timeout;
816 }
817 ifa->ifa_tstamp = jiffies;
818 if (!ifa->ifa_cstamp)
819 ifa->ifa_cstamp = ifa->ifa_tstamp;
820}
821
822static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
823 __u32 *pvalid_lft, __u32 *pprefered_lft,
824 struct netlink_ext_ack *extack)
825{
826 struct nlattr *tb[IFA_MAX+1];
827 struct in_ifaddr *ifa;
828 struct ifaddrmsg *ifm;
829 struct net_device *dev;
830 struct in_device *in_dev;
831 int err;
832
833 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
834 ifa_ipv4_policy, extack);
835 if (err < 0)
836 goto errout;
837
838 ifm = nlmsg_data(nlh);
839 err = -EINVAL;
840 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
841 goto errout;
842
843 dev = __dev_get_by_index(net, ifm->ifa_index);
844 err = -ENODEV;
845 if (!dev)
846 goto errout;
847
848 in_dev = __in_dev_get_rtnl(dev);
849 err = -ENOBUFS;
850 if (!in_dev)
851 goto errout;
852
853 ifa = inet_alloc_ifa();
854 if (!ifa)
855
856
857
858
859 goto errout;
860
861 ipv4_devconf_setall(in_dev);
862 neigh_parms_data_state_setall(in_dev->arp_parms);
863 in_dev_hold(in_dev);
864
865 if (!tb[IFA_ADDRESS])
866 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
867
868 INIT_HLIST_NODE(&ifa->hash);
869 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
870 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
871 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
872 ifm->ifa_flags;
873 ifa->ifa_scope = ifm->ifa_scope;
874 ifa->ifa_dev = in_dev;
875
876 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
877 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
878
879 if (tb[IFA_BROADCAST])
880 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
881
882 if (tb[IFA_LABEL])
883 nla_strscpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
884 else
885 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
886
887 if (tb[IFA_RT_PRIORITY])
888 ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
889
890 if (tb[IFA_CACHEINFO]) {
891 struct ifa_cacheinfo *ci;
892
893 ci = nla_data(tb[IFA_CACHEINFO]);
894 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
895 err = -EINVAL;
896 goto errout_free;
897 }
898 *pvalid_lft = ci->ifa_valid;
899 *pprefered_lft = ci->ifa_prefered;
900 }
901
902 return ifa;
903
904errout_free:
905 inet_free_ifa(ifa);
906errout:
907 return ERR_PTR(err);
908}
909
910static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
911{
912 struct in_device *in_dev = ifa->ifa_dev;
913 struct in_ifaddr *ifa1;
914
915 if (!ifa->ifa_local)
916 return NULL;
917
918 in_dev_for_each_ifa_rtnl(ifa1, in_dev) {
919 if (ifa1->ifa_mask == ifa->ifa_mask &&
920 inet_ifa_match(ifa1->ifa_address, ifa) &&
921 ifa1->ifa_local == ifa->ifa_local)
922 return ifa1;
923 }
924 return NULL;
925}
926
927static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
928 struct netlink_ext_ack *extack)
929{
930 struct net *net = sock_net(skb->sk);
931 struct in_ifaddr *ifa;
932 struct in_ifaddr *ifa_existing;
933 __u32 valid_lft = INFINITY_LIFE_TIME;
934 __u32 prefered_lft = INFINITY_LIFE_TIME;
935
936 ASSERT_RTNL();
937
938 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack);
939 if (IS_ERR(ifa))
940 return PTR_ERR(ifa);
941
942 ifa_existing = find_matching_ifa(ifa);
943 if (!ifa_existing) {
944
945
946
947 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
948 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
949 int ret = ip_mc_autojoin_config(net, true, ifa);
950
951 if (ret < 0) {
952 inet_free_ifa(ifa);
953 return ret;
954 }
955 }
956 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
957 extack);
958 } else {
959 u32 new_metric = ifa->ifa_rt_priority;
960
961 inet_free_ifa(ifa);
962
963 if (nlh->nlmsg_flags & NLM_F_EXCL ||
964 !(nlh->nlmsg_flags & NLM_F_REPLACE))
965 return -EEXIST;
966 ifa = ifa_existing;
967
968 if (ifa->ifa_rt_priority != new_metric) {
969 fib_modify_prefix_metric(ifa, new_metric);
970 ifa->ifa_rt_priority = new_metric;
971 }
972
973 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
974 cancel_delayed_work(&check_lifetime_work);
975 queue_delayed_work(system_power_efficient_wq,
976 &check_lifetime_work, 0);
977 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
978 }
979 return 0;
980}
981
982
983
984
985
986static int inet_abc_len(__be32 addr)
987{
988 int rc = -1;
989
990 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
991 rc = 0;
992 else {
993 __u32 haddr = ntohl(addr);
994 if (IN_CLASSA(haddr))
995 rc = 8;
996 else if (IN_CLASSB(haddr))
997 rc = 16;
998 else if (IN_CLASSC(haddr))
999 rc = 24;
1000 else if (IN_CLASSE(haddr))
1001 rc = 32;
1002 }
1003
1004 return rc;
1005}
1006
1007
1008int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
1009{
1010 struct sockaddr_in sin_orig;
1011 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
1012 struct in_ifaddr __rcu **ifap = NULL;
1013 struct in_device *in_dev;
1014 struct in_ifaddr *ifa = NULL;
1015 struct net_device *dev;
1016 char *colon;
1017 int ret = -EFAULT;
1018 int tryaddrmatch = 0;
1019
1020 ifr->ifr_name[IFNAMSIZ - 1] = 0;
1021
1022
1023 memcpy(&sin_orig, sin, sizeof(*sin));
1024
1025 colon = strchr(ifr->ifr_name, ':');
1026 if (colon)
1027 *colon = 0;
1028
1029 dev_load(net, ifr->ifr_name);
1030
1031 switch (cmd) {
1032 case SIOCGIFADDR:
1033 case SIOCGIFBRDADDR:
1034 case SIOCGIFDSTADDR:
1035 case SIOCGIFNETMASK:
1036
1037
1038
1039
1040 tryaddrmatch = (sin_orig.sin_family == AF_INET);
1041 memset(sin, 0, sizeof(*sin));
1042 sin->sin_family = AF_INET;
1043 break;
1044
1045 case SIOCSIFFLAGS:
1046 ret = -EPERM;
1047 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1048 goto out;
1049 break;
1050 case SIOCSIFADDR:
1051 case SIOCSIFBRDADDR:
1052 case SIOCSIFDSTADDR:
1053 case SIOCSIFNETMASK:
1054 ret = -EPERM;
1055 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1056 goto out;
1057 ret = -EINVAL;
1058 if (sin->sin_family != AF_INET)
1059 goto out;
1060 break;
1061 default:
1062 ret = -EINVAL;
1063 goto out;
1064 }
1065
1066 rtnl_lock();
1067
1068 ret = -ENODEV;
1069 dev = __dev_get_by_name(net, ifr->ifr_name);
1070 if (!dev)
1071 goto done;
1072
1073 if (colon)
1074 *colon = ':';
1075
1076 in_dev = __in_dev_get_rtnl(dev);
1077 if (in_dev) {
1078 if (tryaddrmatch) {
1079
1080
1081
1082
1083
1084
1085 for (ifap = &in_dev->ifa_list;
1086 (ifa = rtnl_dereference(*ifap)) != NULL;
1087 ifap = &ifa->ifa_next) {
1088 if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1089 sin_orig.sin_addr.s_addr ==
1090 ifa->ifa_local) {
1091 break;
1092 }
1093 }
1094 }
1095
1096
1097
1098 if (!ifa) {
1099 for (ifap = &in_dev->ifa_list;
1100 (ifa = rtnl_dereference(*ifap)) != NULL;
1101 ifap = &ifa->ifa_next)
1102 if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1103 break;
1104 }
1105 }
1106
1107 ret = -EADDRNOTAVAIL;
1108 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1109 goto done;
1110
1111 switch (cmd) {
1112 case SIOCGIFADDR:
1113 ret = 0;
1114 sin->sin_addr.s_addr = ifa->ifa_local;
1115 break;
1116
1117 case SIOCGIFBRDADDR:
1118 ret = 0;
1119 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1120 break;
1121
1122 case SIOCGIFDSTADDR:
1123 ret = 0;
1124 sin->sin_addr.s_addr = ifa->ifa_address;
1125 break;
1126
1127 case SIOCGIFNETMASK:
1128 ret = 0;
1129 sin->sin_addr.s_addr = ifa->ifa_mask;
1130 break;
1131
1132 case SIOCSIFFLAGS:
1133 if (colon) {
1134 ret = -EADDRNOTAVAIL;
1135 if (!ifa)
1136 break;
1137 ret = 0;
1138 if (!(ifr->ifr_flags & IFF_UP))
1139 inet_del_ifa(in_dev, ifap, 1);
1140 break;
1141 }
1142 ret = dev_change_flags(dev, ifr->ifr_flags, NULL);
1143 break;
1144
1145 case SIOCSIFADDR:
1146 ret = -EINVAL;
1147 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1148 break;
1149
1150 if (!ifa) {
1151 ret = -ENOBUFS;
1152 ifa = inet_alloc_ifa();
1153 if (!ifa)
1154 break;
1155 INIT_HLIST_NODE(&ifa->hash);
1156 if (colon)
1157 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1158 else
1159 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1160 } else {
1161 ret = 0;
1162 if (ifa->ifa_local == sin->sin_addr.s_addr)
1163 break;
1164 inet_del_ifa(in_dev, ifap, 0);
1165 ifa->ifa_broadcast = 0;
1166 ifa->ifa_scope = 0;
1167 }
1168
1169 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1170
1171 if (!(dev->flags & IFF_POINTOPOINT)) {
1172 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1173 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1174 if ((dev->flags & IFF_BROADCAST) &&
1175 ifa->ifa_prefixlen < 31)
1176 ifa->ifa_broadcast = ifa->ifa_address |
1177 ~ifa->ifa_mask;
1178 } else {
1179 ifa->ifa_prefixlen = 32;
1180 ifa->ifa_mask = inet_make_mask(32);
1181 }
1182 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1183 ret = inet_set_ifa(dev, ifa);
1184 break;
1185
1186 case SIOCSIFBRDADDR:
1187 ret = 0;
1188 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1189 inet_del_ifa(in_dev, ifap, 0);
1190 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1191 inet_insert_ifa(ifa);
1192 }
1193 break;
1194
1195 case SIOCSIFDSTADDR:
1196 ret = 0;
1197 if (ifa->ifa_address == sin->sin_addr.s_addr)
1198 break;
1199 ret = -EINVAL;
1200 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1201 break;
1202 ret = 0;
1203 inet_del_ifa(in_dev, ifap, 0);
1204 ifa->ifa_address = sin->sin_addr.s_addr;
1205 inet_insert_ifa(ifa);
1206 break;
1207
1208 case SIOCSIFNETMASK:
1209
1210
1211
1212
1213 ret = -EINVAL;
1214 if (bad_mask(sin->sin_addr.s_addr, 0))
1215 break;
1216 ret = 0;
1217 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1218 __be32 old_mask = ifa->ifa_mask;
1219 inet_del_ifa(in_dev, ifap, 0);
1220 ifa->ifa_mask = sin->sin_addr.s_addr;
1221 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1222
1223
1224
1225
1226
1227
1228
1229 if ((dev->flags & IFF_BROADCAST) &&
1230 (ifa->ifa_prefixlen < 31) &&
1231 (ifa->ifa_broadcast ==
1232 (ifa->ifa_local|~old_mask))) {
1233 ifa->ifa_broadcast = (ifa->ifa_local |
1234 ~sin->sin_addr.s_addr);
1235 }
1236 inet_insert_ifa(ifa);
1237 }
1238 break;
1239 }
1240done:
1241 rtnl_unlock();
1242out:
1243 return ret;
1244}
1245
1246int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1247{
1248 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1249 const struct in_ifaddr *ifa;
1250 struct ifreq ifr;
1251 int done = 0;
1252
1253 if (WARN_ON(size > sizeof(struct ifreq)))
1254 goto out;
1255
1256 if (!in_dev)
1257 goto out;
1258
1259 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1260 if (!buf) {
1261 done += size;
1262 continue;
1263 }
1264 if (len < size)
1265 break;
1266 memset(&ifr, 0, sizeof(struct ifreq));
1267 strcpy(ifr.ifr_name, ifa->ifa_label);
1268
1269 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1270 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1271 ifa->ifa_local;
1272
1273 if (copy_to_user(buf + done, &ifr, size)) {
1274 done = -EFAULT;
1275 break;
1276 }
1277 len -= size;
1278 done += size;
1279 }
1280out:
1281 return done;
1282}
1283
1284static __be32 in_dev_select_addr(const struct in_device *in_dev,
1285 int scope)
1286{
1287 const struct in_ifaddr *ifa;
1288
1289 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1290 if (ifa->ifa_flags & IFA_F_SECONDARY)
1291 continue;
1292 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1293 ifa->ifa_scope <= scope)
1294 return ifa->ifa_local;
1295 }
1296
1297 return 0;
1298}
1299
1300__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1301{
1302 const struct in_ifaddr *ifa;
1303 __be32 addr = 0;
1304 unsigned char localnet_scope = RT_SCOPE_HOST;
1305 struct in_device *in_dev;
1306 struct net *net = dev_net(dev);
1307 int master_idx;
1308
1309 rcu_read_lock();
1310 in_dev = __in_dev_get_rcu(dev);
1311 if (!in_dev)
1312 goto no_in_dev;
1313
1314 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1315 localnet_scope = RT_SCOPE_LINK;
1316
1317 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1318 if (ifa->ifa_flags & IFA_F_SECONDARY)
1319 continue;
1320 if (min(ifa->ifa_scope, localnet_scope) > scope)
1321 continue;
1322 if (!dst || inet_ifa_match(dst, ifa)) {
1323 addr = ifa->ifa_local;
1324 break;
1325 }
1326 if (!addr)
1327 addr = ifa->ifa_local;
1328 }
1329
1330 if (addr)
1331 goto out_unlock;
1332no_in_dev:
1333 master_idx = l3mdev_master_ifindex_rcu(dev);
1334
1335
1336
1337
1338
1339
1340 if (master_idx &&
1341 (dev = dev_get_by_index_rcu(net, master_idx)) &&
1342 (in_dev = __in_dev_get_rcu(dev))) {
1343 addr = in_dev_select_addr(in_dev, scope);
1344 if (addr)
1345 goto out_unlock;
1346 }
1347
1348
1349
1350
1351
1352 for_each_netdev_rcu(net, dev) {
1353 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1354 continue;
1355
1356 in_dev = __in_dev_get_rcu(dev);
1357 if (!in_dev)
1358 continue;
1359
1360 addr = in_dev_select_addr(in_dev, scope);
1361 if (addr)
1362 goto out_unlock;
1363 }
1364out_unlock:
1365 rcu_read_unlock();
1366 return addr;
1367}
1368EXPORT_SYMBOL(inet_select_addr);
1369
1370static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1371 __be32 local, int scope)
1372{
1373 unsigned char localnet_scope = RT_SCOPE_HOST;
1374 const struct in_ifaddr *ifa;
1375 __be32 addr = 0;
1376 int same = 0;
1377
1378 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1379 localnet_scope = RT_SCOPE_LINK;
1380
1381 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1382 unsigned char min_scope = min(ifa->ifa_scope, localnet_scope);
1383
1384 if (!addr &&
1385 (local == ifa->ifa_local || !local) &&
1386 min_scope <= scope) {
1387 addr = ifa->ifa_local;
1388 if (same)
1389 break;
1390 }
1391 if (!same) {
1392 same = (!local || inet_ifa_match(local, ifa)) &&
1393 (!dst || inet_ifa_match(dst, ifa));
1394 if (same && addr) {
1395 if (local || !dst)
1396 break;
1397
1398 if (inet_ifa_match(addr, ifa))
1399 break;
1400
1401 if (min_scope <= scope) {
1402 addr = ifa->ifa_local;
1403 break;
1404 }
1405
1406 same = 0;
1407 }
1408 }
1409 }
1410
1411 return same ? addr : 0;
1412}
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1423 __be32 dst, __be32 local, int scope)
1424{
1425 __be32 addr = 0;
1426 struct net_device *dev;
1427
1428 if (in_dev)
1429 return confirm_addr_indev(in_dev, dst, local, scope);
1430
1431 rcu_read_lock();
1432 for_each_netdev_rcu(net, dev) {
1433 in_dev = __in_dev_get_rcu(dev);
1434 if (in_dev) {
1435 addr = confirm_addr_indev(in_dev, dst, local, scope);
1436 if (addr)
1437 break;
1438 }
1439 }
1440 rcu_read_unlock();
1441
1442 return addr;
1443}
1444EXPORT_SYMBOL(inet_confirm_addr);
1445
1446
1447
1448
1449
1450int register_inetaddr_notifier(struct notifier_block *nb)
1451{
1452 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1453}
1454EXPORT_SYMBOL(register_inetaddr_notifier);
1455
1456int unregister_inetaddr_notifier(struct notifier_block *nb)
1457{
1458 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1459}
1460EXPORT_SYMBOL(unregister_inetaddr_notifier);
1461
1462int register_inetaddr_validator_notifier(struct notifier_block *nb)
1463{
1464 return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1465}
1466EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1467
1468int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1469{
1470 return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1471 nb);
1472}
1473EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1474
1475
1476
1477
1478static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1479{
1480 struct in_ifaddr *ifa;
1481 int named = 0;
1482
1483 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1484 char old[IFNAMSIZ], *dot;
1485
1486 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1487 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1488 if (named++ == 0)
1489 goto skip;
1490 dot = strchr(old, ':');
1491 if (!dot) {
1492 sprintf(old, ":%d", named);
1493 dot = old;
1494 }
1495 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1496 strcat(ifa->ifa_label, dot);
1497 else
1498 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1499skip:
1500 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1501 }
1502}
1503
1504static void inetdev_send_gratuitous_arp(struct net_device *dev,
1505 struct in_device *in_dev)
1506
1507{
1508 const struct in_ifaddr *ifa;
1509
1510 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1511 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1512 ifa->ifa_local, dev,
1513 ifa->ifa_local, NULL,
1514 dev->dev_addr, NULL);
1515 }
1516}
1517
1518
1519
1520static int inetdev_event(struct notifier_block *this, unsigned long event,
1521 void *ptr)
1522{
1523 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1524 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1525
1526 ASSERT_RTNL();
1527
1528 if (!in_dev) {
1529 if (event == NETDEV_REGISTER) {
1530 in_dev = inetdev_init(dev);
1531 if (IS_ERR(in_dev))
1532 return notifier_from_errno(PTR_ERR(in_dev));
1533 if (dev->flags & IFF_LOOPBACK) {
1534 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1535 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1536 }
1537 } else if (event == NETDEV_CHANGEMTU) {
1538
1539 if (inetdev_valid_mtu(dev->mtu))
1540 in_dev = inetdev_init(dev);
1541 }
1542 goto out;
1543 }
1544
1545 switch (event) {
1546 case NETDEV_REGISTER:
1547 pr_debug("%s: bug\n", __func__);
1548 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1549 break;
1550 case NETDEV_UP:
1551 if (!inetdev_valid_mtu(dev->mtu))
1552 break;
1553 if (dev->flags & IFF_LOOPBACK) {
1554 struct in_ifaddr *ifa = inet_alloc_ifa();
1555
1556 if (ifa) {
1557 INIT_HLIST_NODE(&ifa->hash);
1558 ifa->ifa_local =
1559 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1560 ifa->ifa_prefixlen = 8;
1561 ifa->ifa_mask = inet_make_mask(8);
1562 in_dev_hold(in_dev);
1563 ifa->ifa_dev = in_dev;
1564 ifa->ifa_scope = RT_SCOPE_HOST;
1565 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1566 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1567 INFINITY_LIFE_TIME);
1568 ipv4_devconf_setall(in_dev);
1569 neigh_parms_data_state_setall(in_dev->arp_parms);
1570 inet_insert_ifa(ifa);
1571 }
1572 }
1573 ip_mc_up(in_dev);
1574 fallthrough;
1575 case NETDEV_CHANGEADDR:
1576 if (!IN_DEV_ARP_NOTIFY(in_dev))
1577 break;
1578 fallthrough;
1579 case NETDEV_NOTIFY_PEERS:
1580
1581 inetdev_send_gratuitous_arp(dev, in_dev);
1582 break;
1583 case NETDEV_DOWN:
1584 ip_mc_down(in_dev);
1585 break;
1586 case NETDEV_PRE_TYPE_CHANGE:
1587 ip_mc_unmap(in_dev);
1588 break;
1589 case NETDEV_POST_TYPE_CHANGE:
1590 ip_mc_remap(in_dev);
1591 break;
1592 case NETDEV_CHANGEMTU:
1593 if (inetdev_valid_mtu(dev->mtu))
1594 break;
1595
1596 fallthrough;
1597 case NETDEV_UNREGISTER:
1598 inetdev_destroy(in_dev);
1599 break;
1600 case NETDEV_CHANGENAME:
1601
1602
1603
1604 inetdev_changename(dev, in_dev);
1605
1606 devinet_sysctl_unregister(in_dev);
1607 devinet_sysctl_register(in_dev);
1608 break;
1609 }
1610out:
1611 return NOTIFY_DONE;
1612}
1613
1614static struct notifier_block ip_netdev_notifier = {
1615 .notifier_call = inetdev_event,
1616};
1617
1618static size_t inet_nlmsg_size(void)
1619{
1620 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1621 + nla_total_size(4)
1622 + nla_total_size(4)
1623 + nla_total_size(4)
1624 + nla_total_size(IFNAMSIZ)
1625 + nla_total_size(4)
1626 + nla_total_size(4)
1627 + nla_total_size(sizeof(struct ifa_cacheinfo));
1628}
1629
1630static inline u32 cstamp_delta(unsigned long cstamp)
1631{
1632 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1633}
1634
1635static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1636 unsigned long tstamp, u32 preferred, u32 valid)
1637{
1638 struct ifa_cacheinfo ci;
1639
1640 ci.cstamp = cstamp_delta(cstamp);
1641 ci.tstamp = cstamp_delta(tstamp);
1642 ci.ifa_prefered = preferred;
1643 ci.ifa_valid = valid;
1644
1645 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1646}
1647
1648static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1649 struct inet_fill_args *args)
1650{
1651 struct ifaddrmsg *ifm;
1652 struct nlmsghdr *nlh;
1653 u32 preferred, valid;
1654
1655 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm),
1656 args->flags);
1657 if (!nlh)
1658 return -EMSGSIZE;
1659
1660 ifm = nlmsg_data(nlh);
1661 ifm->ifa_family = AF_INET;
1662 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1663 ifm->ifa_flags = ifa->ifa_flags;
1664 ifm->ifa_scope = ifa->ifa_scope;
1665 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1666
1667 if (args->netnsid >= 0 &&
1668 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
1669 goto nla_put_failure;
1670
1671 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1672 preferred = ifa->ifa_preferred_lft;
1673 valid = ifa->ifa_valid_lft;
1674 if (preferred != INFINITY_LIFE_TIME) {
1675 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1676
1677 if (preferred > tval)
1678 preferred -= tval;
1679 else
1680 preferred = 0;
1681 if (valid != INFINITY_LIFE_TIME) {
1682 if (valid > tval)
1683 valid -= tval;
1684 else
1685 valid = 0;
1686 }
1687 }
1688 } else {
1689 preferred = INFINITY_LIFE_TIME;
1690 valid = INFINITY_LIFE_TIME;
1691 }
1692 if ((ifa->ifa_address &&
1693 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1694 (ifa->ifa_local &&
1695 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1696 (ifa->ifa_broadcast &&
1697 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1698 (ifa->ifa_label[0] &&
1699 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1700 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1701 (ifa->ifa_rt_priority &&
1702 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
1703 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1704 preferred, valid))
1705 goto nla_put_failure;
1706
1707 nlmsg_end(skb, nlh);
1708 return 0;
1709
1710nla_put_failure:
1711 nlmsg_cancel(skb, nlh);
1712 return -EMSGSIZE;
1713}
1714
1715static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
1716 struct inet_fill_args *fillargs,
1717 struct net **tgt_net, struct sock *sk,
1718 struct netlink_callback *cb)
1719{
1720 struct netlink_ext_ack *extack = cb->extack;
1721 struct nlattr *tb[IFA_MAX+1];
1722 struct ifaddrmsg *ifm;
1723 int err, i;
1724
1725 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1726 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request");
1727 return -EINVAL;
1728 }
1729
1730 ifm = nlmsg_data(nlh);
1731 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
1732 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request");
1733 return -EINVAL;
1734 }
1735
1736 fillargs->ifindex = ifm->ifa_index;
1737 if (fillargs->ifindex) {
1738 cb->answer_flags |= NLM_F_DUMP_FILTERED;
1739 fillargs->flags |= NLM_F_DUMP_FILTERED;
1740 }
1741
1742 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
1743 ifa_ipv4_policy, extack);
1744 if (err < 0)
1745 return err;
1746
1747 for (i = 0; i <= IFA_MAX; ++i) {
1748 if (!tb[i])
1749 continue;
1750
1751 if (i == IFA_TARGET_NETNSID) {
1752 struct net *net;
1753
1754 fillargs->netnsid = nla_get_s32(tb[i]);
1755
1756 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
1757 if (IS_ERR(net)) {
1758 fillargs->netnsid = -1;
1759 NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id");
1760 return PTR_ERR(net);
1761 }
1762 *tgt_net = net;
1763 } else {
1764 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request");
1765 return -EINVAL;
1766 }
1767 }
1768
1769 return 0;
1770}
1771
1772static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,
1773 struct netlink_callback *cb, int s_ip_idx,
1774 struct inet_fill_args *fillargs)
1775{
1776 struct in_ifaddr *ifa;
1777 int ip_idx = 0;
1778 int err;
1779
1780 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1781 if (ip_idx < s_ip_idx) {
1782 ip_idx++;
1783 continue;
1784 }
1785 err = inet_fill_ifaddr(skb, ifa, fillargs);
1786 if (err < 0)
1787 goto done;
1788
1789 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1790 ip_idx++;
1791 }
1792 err = 0;
1793
1794done:
1795 cb->args[2] = ip_idx;
1796
1797 return err;
1798}
1799
1800static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1801{
1802 const struct nlmsghdr *nlh = cb->nlh;
1803 struct inet_fill_args fillargs = {
1804 .portid = NETLINK_CB(cb->skb).portid,
1805 .seq = nlh->nlmsg_seq,
1806 .event = RTM_NEWADDR,
1807 .flags = NLM_F_MULTI,
1808 .netnsid = -1,
1809 };
1810 struct net *net = sock_net(skb->sk);
1811 struct net *tgt_net = net;
1812 int h, s_h;
1813 int idx, s_idx;
1814 int s_ip_idx;
1815 struct net_device *dev;
1816 struct in_device *in_dev;
1817 struct hlist_head *head;
1818 int err = 0;
1819
1820 s_h = cb->args[0];
1821 s_idx = idx = cb->args[1];
1822 s_ip_idx = cb->args[2];
1823
1824 if (cb->strict_check) {
1825 err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
1826 skb->sk, cb);
1827 if (err < 0)
1828 goto put_tgt_net;
1829
1830 err = 0;
1831 if (fillargs.ifindex) {
1832 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
1833 if (!dev) {
1834 err = -ENODEV;
1835 goto put_tgt_net;
1836 }
1837
1838 in_dev = __in_dev_get_rtnl(dev);
1839 if (in_dev) {
1840 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1841 &fillargs);
1842 }
1843 goto put_tgt_net;
1844 }
1845 }
1846
1847 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1848 idx = 0;
1849 head = &tgt_net->dev_index_head[h];
1850 rcu_read_lock();
1851 cb->seq = atomic_read(&tgt_net->ipv4.dev_addr_genid) ^
1852 tgt_net->dev_base_seq;
1853 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1854 if (idx < s_idx)
1855 goto cont;
1856 if (h > s_h || idx > s_idx)
1857 s_ip_idx = 0;
1858 in_dev = __in_dev_get_rcu(dev);
1859 if (!in_dev)
1860 goto cont;
1861
1862 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1863 &fillargs);
1864 if (err < 0) {
1865 rcu_read_unlock();
1866 goto done;
1867 }
1868cont:
1869 idx++;
1870 }
1871 rcu_read_unlock();
1872 }
1873
1874done:
1875 cb->args[0] = h;
1876 cb->args[1] = idx;
1877put_tgt_net:
1878 if (fillargs.netnsid >= 0)
1879 put_net(tgt_net);
1880
1881 return skb->len ? : err;
1882}
1883
1884static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1885 u32 portid)
1886{
1887 struct inet_fill_args fillargs = {
1888 .portid = portid,
1889 .seq = nlh ? nlh->nlmsg_seq : 0,
1890 .event = event,
1891 .flags = 0,
1892 .netnsid = -1,
1893 };
1894 struct sk_buff *skb;
1895 int err = -ENOBUFS;
1896 struct net *net;
1897
1898 net = dev_net(ifa->ifa_dev->dev);
1899 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1900 if (!skb)
1901 goto errout;
1902
1903 err = inet_fill_ifaddr(skb, ifa, &fillargs);
1904 if (err < 0) {
1905
1906 WARN_ON(err == -EMSGSIZE);
1907 kfree_skb(skb);
1908 goto errout;
1909 }
1910 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1911 return;
1912errout:
1913 if (err < 0)
1914 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1915}
1916
1917static size_t inet_get_link_af_size(const struct net_device *dev,
1918 u32 ext_filter_mask)
1919{
1920 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1921
1922 if (!in_dev)
1923 return 0;
1924
1925 return nla_total_size(IPV4_DEVCONF_MAX * 4);
1926}
1927
1928static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1929 u32 ext_filter_mask)
1930{
1931 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1932 struct nlattr *nla;
1933 int i;
1934
1935 if (!in_dev)
1936 return -ENODATA;
1937
1938 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1939 if (!nla)
1940 return -EMSGSIZE;
1941
1942 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1943 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1944
1945 return 0;
1946}
1947
1948static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1949 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1950};
1951
1952static int inet_validate_link_af(const struct net_device *dev,
1953 const struct nlattr *nla,
1954 struct netlink_ext_ack *extack)
1955{
1956 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1957 int err, rem;
1958
1959 if (dev && !__in_dev_get_rtnl(dev))
1960 return -EAFNOSUPPORT;
1961
1962 err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla,
1963 inet_af_policy, extack);
1964 if (err < 0)
1965 return err;
1966
1967 if (tb[IFLA_INET_CONF]) {
1968 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1969 int cfgid = nla_type(a);
1970
1971 if (nla_len(a) < 4)
1972 return -EINVAL;
1973
1974 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1975 return -EINVAL;
1976 }
1977 }
1978
1979 return 0;
1980}
1981
1982static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla,
1983 struct netlink_ext_ack *extack)
1984{
1985 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1986 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1987 int rem;
1988
1989 if (!in_dev)
1990 return -EAFNOSUPPORT;
1991
1992 if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
1993 return -EINVAL;
1994
1995 if (tb[IFLA_INET_CONF]) {
1996 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1997 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1998 }
1999
2000 return 0;
2001}
2002
2003static int inet_netconf_msgsize_devconf(int type)
2004{
2005 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
2006 + nla_total_size(4);
2007 bool all = false;
2008
2009 if (type == NETCONFA_ALL)
2010 all = true;
2011
2012 if (all || type == NETCONFA_FORWARDING)
2013 size += nla_total_size(4);
2014 if (all || type == NETCONFA_RP_FILTER)
2015 size += nla_total_size(4);
2016 if (all || type == NETCONFA_MC_FORWARDING)
2017 size += nla_total_size(4);
2018 if (all || type == NETCONFA_BC_FORWARDING)
2019 size += nla_total_size(4);
2020 if (all || type == NETCONFA_PROXY_NEIGH)
2021 size += nla_total_size(4);
2022 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
2023 size += nla_total_size(4);
2024
2025 return size;
2026}
2027
2028static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
2029 struct ipv4_devconf *devconf, u32 portid,
2030 u32 seq, int event, unsigned int flags,
2031 int type)
2032{
2033 struct nlmsghdr *nlh;
2034 struct netconfmsg *ncm;
2035 bool all = false;
2036
2037 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
2038 flags);
2039 if (!nlh)
2040 return -EMSGSIZE;
2041
2042 if (type == NETCONFA_ALL)
2043 all = true;
2044
2045 ncm = nlmsg_data(nlh);
2046 ncm->ncm_family = AF_INET;
2047
2048 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
2049 goto nla_put_failure;
2050
2051 if (!devconf)
2052 goto out;
2053
2054 if ((all || type == NETCONFA_FORWARDING) &&
2055 nla_put_s32(skb, NETCONFA_FORWARDING,
2056 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
2057 goto nla_put_failure;
2058 if ((all || type == NETCONFA_RP_FILTER) &&
2059 nla_put_s32(skb, NETCONFA_RP_FILTER,
2060 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
2061 goto nla_put_failure;
2062 if ((all || type == NETCONFA_MC_FORWARDING) &&
2063 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
2064 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
2065 goto nla_put_failure;
2066 if ((all || type == NETCONFA_BC_FORWARDING) &&
2067 nla_put_s32(skb, NETCONFA_BC_FORWARDING,
2068 IPV4_DEVCONF(*devconf, BC_FORWARDING)) < 0)
2069 goto nla_put_failure;
2070 if ((all || type == NETCONFA_PROXY_NEIGH) &&
2071 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
2072 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
2073 goto nla_put_failure;
2074 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
2075 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2076 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
2077 goto nla_put_failure;
2078
2079out:
2080 nlmsg_end(skb, nlh);
2081 return 0;
2082
2083nla_put_failure:
2084 nlmsg_cancel(skb, nlh);
2085 return -EMSGSIZE;
2086}
2087
2088void inet_netconf_notify_devconf(struct net *net, int event, int type,
2089 int ifindex, struct ipv4_devconf *devconf)
2090{
2091 struct sk_buff *skb;
2092 int err = -ENOBUFS;
2093
2094 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
2095 if (!skb)
2096 goto errout;
2097
2098 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
2099 event, 0, type);
2100 if (err < 0) {
2101
2102 WARN_ON(err == -EMSGSIZE);
2103 kfree_skb(skb);
2104 goto errout;
2105 }
2106 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
2107 return;
2108errout:
2109 if (err < 0)
2110 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
2111}
2112
2113static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
2114 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
2115 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
2116 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
2117 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
2118 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
2119};
2120
2121static int inet_netconf_valid_get_req(struct sk_buff *skb,
2122 const struct nlmsghdr *nlh,
2123 struct nlattr **tb,
2124 struct netlink_ext_ack *extack)
2125{
2126 int i, err;
2127
2128 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
2129 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request");
2130 return -EINVAL;
2131 }
2132
2133 if (!netlink_strict_get_check(skb))
2134 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
2135 tb, NETCONFA_MAX,
2136 devconf_ipv4_policy, extack);
2137
2138 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
2139 tb, NETCONFA_MAX,
2140 devconf_ipv4_policy, extack);
2141 if (err)
2142 return err;
2143
2144 for (i = 0; i <= NETCONFA_MAX; i++) {
2145 if (!tb[i])
2146 continue;
2147
2148 switch (i) {
2149 case NETCONFA_IFINDEX:
2150 break;
2151 default:
2152 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request");
2153 return -EINVAL;
2154 }
2155 }
2156
2157 return 0;
2158}
2159
2160static int inet_netconf_get_devconf(struct sk_buff *in_skb,
2161 struct nlmsghdr *nlh,
2162 struct netlink_ext_ack *extack)
2163{
2164 struct net *net = sock_net(in_skb->sk);
2165 struct nlattr *tb[NETCONFA_MAX+1];
2166 struct sk_buff *skb;
2167 struct ipv4_devconf *devconf;
2168 struct in_device *in_dev;
2169 struct net_device *dev;
2170 int ifindex;
2171 int err;
2172
2173 err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack);
2174 if (err)
2175 goto errout;
2176
2177 err = -EINVAL;
2178 if (!tb[NETCONFA_IFINDEX])
2179 goto errout;
2180
2181 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
2182 switch (ifindex) {
2183 case NETCONFA_IFINDEX_ALL:
2184 devconf = net->ipv4.devconf_all;
2185 break;
2186 case NETCONFA_IFINDEX_DEFAULT:
2187 devconf = net->ipv4.devconf_dflt;
2188 break;
2189 default:
2190 dev = __dev_get_by_index(net, ifindex);
2191 if (!dev)
2192 goto errout;
2193 in_dev = __in_dev_get_rtnl(dev);
2194 if (!in_dev)
2195 goto errout;
2196 devconf = &in_dev->cnf;
2197 break;
2198 }
2199
2200 err = -ENOBUFS;
2201 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
2202 if (!skb)
2203 goto errout;
2204
2205 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
2206 NETLINK_CB(in_skb).portid,
2207 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
2208 NETCONFA_ALL);
2209 if (err < 0) {
2210
2211 WARN_ON(err == -EMSGSIZE);
2212 kfree_skb(skb);
2213 goto errout;
2214 }
2215 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2216errout:
2217 return err;
2218}
2219
2220static int inet_netconf_dump_devconf(struct sk_buff *skb,
2221 struct netlink_callback *cb)
2222{
2223 const struct nlmsghdr *nlh = cb->nlh;
2224 struct net *net = sock_net(skb->sk);
2225 int h, s_h;
2226 int idx, s_idx;
2227 struct net_device *dev;
2228 struct in_device *in_dev;
2229 struct hlist_head *head;
2230
2231 if (cb->strict_check) {
2232 struct netlink_ext_ack *extack = cb->extack;
2233 struct netconfmsg *ncm;
2234
2235 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
2236 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request");
2237 return -EINVAL;
2238 }
2239
2240 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
2241 NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request");
2242 return -EINVAL;
2243 }
2244 }
2245
2246 s_h = cb->args[0];
2247 s_idx = idx = cb->args[1];
2248
2249 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2250 idx = 0;
2251 head = &net->dev_index_head[h];
2252 rcu_read_lock();
2253 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
2254 net->dev_base_seq;
2255 hlist_for_each_entry_rcu(dev, head, index_hlist) {
2256 if (idx < s_idx)
2257 goto cont;
2258 in_dev = __in_dev_get_rcu(dev);
2259 if (!in_dev)
2260 goto cont;
2261
2262 if (inet_netconf_fill_devconf(skb, dev->ifindex,
2263 &in_dev->cnf,
2264 NETLINK_CB(cb->skb).portid,
2265 nlh->nlmsg_seq,
2266 RTM_NEWNETCONF,
2267 NLM_F_MULTI,
2268 NETCONFA_ALL) < 0) {
2269 rcu_read_unlock();
2270 goto done;
2271 }
2272 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2273cont:
2274 idx++;
2275 }
2276 rcu_read_unlock();
2277 }
2278 if (h == NETDEV_HASHENTRIES) {
2279 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2280 net->ipv4.devconf_all,
2281 NETLINK_CB(cb->skb).portid,
2282 nlh->nlmsg_seq,
2283 RTM_NEWNETCONF, NLM_F_MULTI,
2284 NETCONFA_ALL) < 0)
2285 goto done;
2286 else
2287 h++;
2288 }
2289 if (h == NETDEV_HASHENTRIES + 1) {
2290 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2291 net->ipv4.devconf_dflt,
2292 NETLINK_CB(cb->skb).portid,
2293 nlh->nlmsg_seq,
2294 RTM_NEWNETCONF, NLM_F_MULTI,
2295 NETCONFA_ALL) < 0)
2296 goto done;
2297 else
2298 h++;
2299 }
2300done:
2301 cb->args[0] = h;
2302 cb->args[1] = idx;
2303
2304 return skb->len;
2305}
2306
2307#ifdef CONFIG_SYSCTL
2308
2309static void devinet_copy_dflt_conf(struct net *net, int i)
2310{
2311 struct net_device *dev;
2312
2313 rcu_read_lock();
2314 for_each_netdev_rcu(net, dev) {
2315 struct in_device *in_dev;
2316
2317 in_dev = __in_dev_get_rcu(dev);
2318 if (in_dev && !test_bit(i, in_dev->cnf.state))
2319 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2320 }
2321 rcu_read_unlock();
2322}
2323
2324
2325static void inet_forward_change(struct net *net)
2326{
2327 struct net_device *dev;
2328 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2329
2330 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2331 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2332 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2333 NETCONFA_FORWARDING,
2334 NETCONFA_IFINDEX_ALL,
2335 net->ipv4.devconf_all);
2336 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2337 NETCONFA_FORWARDING,
2338 NETCONFA_IFINDEX_DEFAULT,
2339 net->ipv4.devconf_dflt);
2340
2341 for_each_netdev(net, dev) {
2342 struct in_device *in_dev;
2343
2344 if (on)
2345 dev_disable_lro(dev);
2346
2347 in_dev = __in_dev_get_rtnl(dev);
2348 if (in_dev) {
2349 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2350 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2351 NETCONFA_FORWARDING,
2352 dev->ifindex, &in_dev->cnf);
2353 }
2354 }
2355}
2356
2357static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2358{
2359 if (cnf == net->ipv4.devconf_dflt)
2360 return NETCONFA_IFINDEX_DEFAULT;
2361 else if (cnf == net->ipv4.devconf_all)
2362 return NETCONFA_IFINDEX_ALL;
2363 else {
2364 struct in_device *idev
2365 = container_of(cnf, struct in_device, cnf);
2366 return idev->dev->ifindex;
2367 }
2368}
2369
2370static int devinet_conf_proc(struct ctl_table *ctl, int write,
2371 void *buffer, size_t *lenp, loff_t *ppos)
2372{
2373 int old_value = *(int *)ctl->data;
2374 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2375 int new_value = *(int *)ctl->data;
2376
2377 if (write) {
2378 struct ipv4_devconf *cnf = ctl->extra1;
2379 struct net *net = ctl->extra2;
2380 int i = (int *)ctl->data - cnf->data;
2381 int ifindex;
2382
2383 set_bit(i, cnf->state);
2384
2385 if (cnf == net->ipv4.devconf_dflt)
2386 devinet_copy_dflt_conf(net, i);
2387 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2388 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2389 if ((new_value == 0) && (old_value != 0))
2390 rt_cache_flush(net);
2391
2392 if (i == IPV4_DEVCONF_BC_FORWARDING - 1 &&
2393 new_value != old_value)
2394 rt_cache_flush(net);
2395
2396 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2397 new_value != old_value) {
2398 ifindex = devinet_conf_ifindex(net, cnf);
2399 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2400 NETCONFA_RP_FILTER,
2401 ifindex, cnf);
2402 }
2403 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2404 new_value != old_value) {
2405 ifindex = devinet_conf_ifindex(net, cnf);
2406 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2407 NETCONFA_PROXY_NEIGH,
2408 ifindex, cnf);
2409 }
2410 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2411 new_value != old_value) {
2412 ifindex = devinet_conf_ifindex(net, cnf);
2413 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2414 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2415 ifindex, cnf);
2416 }
2417 }
2418
2419 return ret;
2420}
2421
2422static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2423 void *buffer, size_t *lenp, loff_t *ppos)
2424{
2425 int *valp = ctl->data;
2426 int val = *valp;
2427 loff_t pos = *ppos;
2428 struct net *net = ctl->extra2;
2429 int ret;
2430
2431 if (write && !ns_capable(net->user_ns, CAP_NET_ADMIN))
2432 return -EPERM;
2433
2434 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2435
2436 if (write && *valp != val) {
2437 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2438 if (!rtnl_trylock()) {
2439
2440 *valp = val;
2441 *ppos = pos;
2442 return restart_syscall();
2443 }
2444 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2445 inet_forward_change(net);
2446 } else {
2447 struct ipv4_devconf *cnf = ctl->extra1;
2448 struct in_device *idev =
2449 container_of(cnf, struct in_device, cnf);
2450 if (*valp)
2451 dev_disable_lro(idev->dev);
2452 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2453 NETCONFA_FORWARDING,
2454 idev->dev->ifindex,
2455 cnf);
2456 }
2457 rtnl_unlock();
2458 rt_cache_flush(net);
2459 } else
2460 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2461 NETCONFA_FORWARDING,
2462 NETCONFA_IFINDEX_DEFAULT,
2463 net->ipv4.devconf_dflt);
2464 }
2465
2466 return ret;
2467}
2468
2469static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2470 void *buffer, size_t *lenp, loff_t *ppos)
2471{
2472 int *valp = ctl->data;
2473 int val = *valp;
2474 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2475 struct net *net = ctl->extra2;
2476
2477 if (write && *valp != val)
2478 rt_cache_flush(net);
2479
2480 return ret;
2481}
2482
2483#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2484 { \
2485 .procname = name, \
2486 .data = ipv4_devconf.data + \
2487 IPV4_DEVCONF_ ## attr - 1, \
2488 .maxlen = sizeof(int), \
2489 .mode = mval, \
2490 .proc_handler = proc, \
2491 .extra1 = &ipv4_devconf, \
2492 }
2493
2494#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2495 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2496
2497#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2498 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2499
2500#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2501 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2502
2503#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2504 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2505
2506static struct devinet_sysctl_table {
2507 struct ctl_table_header *sysctl_header;
2508 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2509} devinet_sysctl = {
2510 .devinet_vars = {
2511 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2512 devinet_sysctl_forward),
2513 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2514 DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"),
2515
2516 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2517 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2518 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2519 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2520 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2521 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2522 "accept_source_route"),
2523 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2524 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2525 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2526 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2527 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2528 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2529 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2530 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2531 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2532 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2533 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2534 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2535 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2536 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2537 "force_igmp_version"),
2538 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2539 "igmpv2_unsolicited_report_interval"),
2540 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2541 "igmpv3_unsolicited_report_interval"),
2542 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2543 "ignore_routes_with_linkdown"),
2544 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2545 "drop_gratuitous_arp"),
2546
2547 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2548 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2549 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2550 "promote_secondaries"),
2551 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2552 "route_localnet"),
2553 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2554 "drop_unicast_in_l2_multicast"),
2555 },
2556};
2557
2558static int __devinet_sysctl_register(struct net *net, char *dev_name,
2559 int ifindex, struct ipv4_devconf *p)
2560{
2561 int i;
2562 struct devinet_sysctl_table *t;
2563 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2564
2565 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2566 if (!t)
2567 goto out;
2568
2569 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2570 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2571 t->devinet_vars[i].extra1 = p;
2572 t->devinet_vars[i].extra2 = net;
2573 }
2574
2575 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2576
2577 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2578 if (!t->sysctl_header)
2579 goto free;
2580
2581 p->sysctl = t;
2582
2583 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2584 ifindex, p);
2585 return 0;
2586
2587free:
2588 kfree(t);
2589out:
2590 return -ENOBUFS;
2591}
2592
2593static void __devinet_sysctl_unregister(struct net *net,
2594 struct ipv4_devconf *cnf, int ifindex)
2595{
2596 struct devinet_sysctl_table *t = cnf->sysctl;
2597
2598 if (t) {
2599 cnf->sysctl = NULL;
2600 unregister_net_sysctl_table(t->sysctl_header);
2601 kfree(t);
2602 }
2603
2604 inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
2605}
2606
2607static int devinet_sysctl_register(struct in_device *idev)
2608{
2609 int err;
2610
2611 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2612 return -EINVAL;
2613
2614 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2615 if (err)
2616 return err;
2617 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2618 idev->dev->ifindex, &idev->cnf);
2619 if (err)
2620 neigh_sysctl_unregister(idev->arp_parms);
2621 return err;
2622}
2623
2624static void devinet_sysctl_unregister(struct in_device *idev)
2625{
2626 struct net *net = dev_net(idev->dev);
2627
2628 __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2629 neigh_sysctl_unregister(idev->arp_parms);
2630}
2631
2632static struct ctl_table ctl_forward_entry[] = {
2633 {
2634 .procname = "ip_forward",
2635 .data = &ipv4_devconf.data[
2636 IPV4_DEVCONF_FORWARDING - 1],
2637 .maxlen = sizeof(int),
2638 .mode = 0644,
2639 .proc_handler = devinet_sysctl_forward,
2640 .extra1 = &ipv4_devconf,
2641 .extra2 = &init_net,
2642 },
2643 { },
2644};
2645#endif
2646
2647static __net_init int devinet_init_net(struct net *net)
2648{
2649 int err;
2650 struct ipv4_devconf *all, *dflt;
2651#ifdef CONFIG_SYSCTL
2652 struct ctl_table *tbl;
2653 struct ctl_table_header *forw_hdr;
2654#endif
2655
2656 err = -ENOMEM;
2657 all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
2658 if (!all)
2659 goto err_alloc_all;
2660
2661 dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2662 if (!dflt)
2663 goto err_alloc_dflt;
2664
2665#ifdef CONFIG_SYSCTL
2666 tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL);
2667 if (!tbl)
2668 goto err_alloc_ctl;
2669
2670 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2671 tbl[0].extra1 = all;
2672 tbl[0].extra2 = net;
2673#endif
2674
2675 if (!net_eq(net, &init_net)) {
2676 if (IS_ENABLED(CONFIG_SYSCTL) &&
2677 sysctl_devconf_inherit_init_net == 3) {
2678
2679 memcpy(all, current->nsproxy->net_ns->ipv4.devconf_all,
2680 sizeof(ipv4_devconf));
2681 memcpy(dflt,
2682 current->nsproxy->net_ns->ipv4.devconf_dflt,
2683 sizeof(ipv4_devconf_dflt));
2684 } else if (!IS_ENABLED(CONFIG_SYSCTL) ||
2685 sysctl_devconf_inherit_init_net != 2) {
2686
2687 memcpy(all, init_net.ipv4.devconf_all,
2688 sizeof(ipv4_devconf));
2689 memcpy(dflt, init_net.ipv4.devconf_dflt,
2690 sizeof(ipv4_devconf_dflt));
2691 }
2692
2693 }
2694
2695#ifdef CONFIG_SYSCTL
2696 err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2697 if (err < 0)
2698 goto err_reg_all;
2699
2700 err = __devinet_sysctl_register(net, "default",
2701 NETCONFA_IFINDEX_DEFAULT, dflt);
2702 if (err < 0)
2703 goto err_reg_dflt;
2704
2705 err = -ENOMEM;
2706 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2707 if (!forw_hdr)
2708 goto err_reg_ctl;
2709 net->ipv4.forw_hdr = forw_hdr;
2710#endif
2711
2712 net->ipv4.devconf_all = all;
2713 net->ipv4.devconf_dflt = dflt;
2714 return 0;
2715
2716#ifdef CONFIG_SYSCTL
2717err_reg_ctl:
2718 __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2719err_reg_dflt:
2720 __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2721err_reg_all:
2722 kfree(tbl);
2723err_alloc_ctl:
2724#endif
2725 kfree(dflt);
2726err_alloc_dflt:
2727 kfree(all);
2728err_alloc_all:
2729 return err;
2730}
2731
2732static __net_exit void devinet_exit_net(struct net *net)
2733{
2734#ifdef CONFIG_SYSCTL
2735 struct ctl_table *tbl;
2736
2737 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2738 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2739 __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2740 NETCONFA_IFINDEX_DEFAULT);
2741 __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2742 NETCONFA_IFINDEX_ALL);
2743 kfree(tbl);
2744#endif
2745 kfree(net->ipv4.devconf_dflt);
2746 kfree(net->ipv4.devconf_all);
2747}
2748
2749static __net_initdata struct pernet_operations devinet_ops = {
2750 .init = devinet_init_net,
2751 .exit = devinet_exit_net,
2752};
2753
2754static struct rtnl_af_ops inet_af_ops __read_mostly = {
2755 .family = AF_INET,
2756 .fill_link_af = inet_fill_link_af,
2757 .get_link_af_size = inet_get_link_af_size,
2758 .validate_link_af = inet_validate_link_af,
2759 .set_link_af = inet_set_link_af,
2760};
2761
2762void __init devinet_init(void)
2763{
2764 int i;
2765
2766 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2767 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2768
2769 register_pernet_subsys(&devinet_ops);
2770 register_netdevice_notifier(&ip_netdev_notifier);
2771
2772 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2773
2774 rtnl_af_register(&inet_af_ops);
2775
2776 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2777 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2778 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
2779 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2780 inet_netconf_dump_devconf, 0);
2781}
2782