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