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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 [IFA_RT_PRIORITY] = { .type = NLA_U32 },
103};
104
105#define IN4_ADDR_HSIZE_SHIFT 8
106#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
107
108static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
109
110static u32 inet_addr_hash(const struct net *net, __be32 addr)
111{
112 u32 val = (__force u32) addr ^ net_hash_mix(net);
113
114 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
115}
116
117static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
118{
119 u32 hash = inet_addr_hash(net, ifa->ifa_local);
120
121 ASSERT_RTNL();
122 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
123}
124
125static void inet_hash_remove(struct in_ifaddr *ifa)
126{
127 ASSERT_RTNL();
128 hlist_del_init_rcu(&ifa->hash);
129}
130
131
132
133
134
135
136
137
138
139struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
140{
141 struct net_device *result = NULL;
142 struct in_ifaddr *ifa;
143
144 rcu_read_lock();
145 ifa = inet_lookup_ifaddr_rcu(net, addr);
146 if (!ifa) {
147 struct flowi4 fl4 = { .daddr = addr };
148 struct fib_result res = { 0 };
149 struct fib_table *local;
150
151
152
153
154 local = fib_get_table(net, RT_TABLE_LOCAL);
155 if (local &&
156 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
157 res.type == RTN_LOCAL)
158 result = FIB_RES_DEV(res);
159 } else {
160 result = ifa->ifa_dev->dev;
161 }
162 if (result && devref)
163 dev_hold(result);
164 rcu_read_unlock();
165 return result;
166}
167EXPORT_SYMBOL(__ip_dev_find);
168
169
170struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
171{
172 u32 hash = inet_addr_hash(net, addr);
173 struct in_ifaddr *ifa;
174
175 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
176 if (ifa->ifa_local == addr &&
177 net_eq(dev_net(ifa->ifa_dev->dev), net))
178 return ifa;
179
180 return NULL;
181}
182
183static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
184
185static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
186static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
187static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
188 int destroy);
189#ifdef CONFIG_SYSCTL
190static int devinet_sysctl_register(struct in_device *idev);
191static void devinet_sysctl_unregister(struct in_device *idev);
192#else
193static int devinet_sysctl_register(struct in_device *idev)
194{
195 return 0;
196}
197static void devinet_sysctl_unregister(struct in_device *idev)
198{
199}
200#endif
201
202
203
204static struct in_ifaddr *inet_alloc_ifa(void)
205{
206 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
207}
208
209static void inet_rcu_free_ifa(struct rcu_head *head)
210{
211 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
212 if (ifa->ifa_dev)
213 in_dev_put(ifa->ifa_dev);
214 kfree(ifa);
215}
216
217static void inet_free_ifa(struct in_ifaddr *ifa)
218{
219 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
220}
221
222void in_dev_finish_destroy(struct in_device *idev)
223{
224 struct net_device *dev = idev->dev;
225
226 WARN_ON(idev->ifa_list);
227 WARN_ON(idev->mc_list);
228 kfree(rcu_dereference_protected(idev->mc_hash, 1));
229#ifdef NET_REFCNT_DEBUG
230 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
231#endif
232 dev_put(dev);
233 if (!idev->dead)
234 pr_err("Freeing alive in_device %p\n", idev);
235 else
236 kfree(idev);
237}
238EXPORT_SYMBOL(in_dev_finish_destroy);
239
240static struct in_device *inetdev_init(struct net_device *dev)
241{
242 struct in_device *in_dev;
243 int err = -ENOMEM;
244
245 ASSERT_RTNL();
246
247 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
248 if (!in_dev)
249 goto out;
250 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
251 sizeof(in_dev->cnf));
252 in_dev->cnf.sysctl = NULL;
253 in_dev->dev = dev;
254 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
255 if (!in_dev->arp_parms)
256 goto out_kfree;
257 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
258 dev_disable_lro(dev);
259
260 dev_hold(dev);
261
262 refcount_set(&in_dev->refcnt, 1);
263
264 err = devinet_sysctl_register(in_dev);
265 if (err) {
266 in_dev->dead = 1;
267 in_dev_put(in_dev);
268 in_dev = NULL;
269 goto out;
270 }
271 ip_mc_init_dev(in_dev);
272 if (dev->flags & IFF_UP)
273 ip_mc_up(in_dev);
274
275
276 rcu_assign_pointer(dev->ip_ptr, in_dev);
277out:
278 return in_dev ?: ERR_PTR(err);
279out_kfree:
280 kfree(in_dev);
281 in_dev = NULL;
282 goto out;
283}
284
285static void in_dev_rcu_put(struct rcu_head *head)
286{
287 struct in_device *idev = container_of(head, struct in_device, rcu_head);
288 in_dev_put(idev);
289}
290
291static void inetdev_destroy(struct in_device *in_dev)
292{
293 struct in_ifaddr *ifa;
294 struct net_device *dev;
295
296 ASSERT_RTNL();
297
298 dev = in_dev->dev;
299
300 in_dev->dead = 1;
301
302 ip_mc_destroy_dev(in_dev);
303
304 while ((ifa = in_dev->ifa_list) != NULL) {
305 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
306 inet_free_ifa(ifa);
307 }
308
309 RCU_INIT_POINTER(dev->ip_ptr, NULL);
310
311 devinet_sysctl_unregister(in_dev);
312 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
313 arp_ifdown(dev);
314
315 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
316}
317
318int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
319{
320 rcu_read_lock();
321 for_primary_ifa(in_dev) {
322 if (inet_ifa_match(a, ifa)) {
323 if (!b || inet_ifa_match(b, ifa)) {
324 rcu_read_unlock();
325 return 1;
326 }
327 }
328 } endfor_ifa(in_dev);
329 rcu_read_unlock();
330 return 0;
331}
332
333static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
334 int destroy, struct nlmsghdr *nlh, u32 portid)
335{
336 struct in_ifaddr *promote = NULL;
337 struct in_ifaddr *ifa, *ifa1 = *ifap;
338 struct in_ifaddr *last_prim = in_dev->ifa_list;
339 struct in_ifaddr *prev_prom = NULL;
340 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
341
342 ASSERT_RTNL();
343
344 if (in_dev->dead)
345 goto no_promotions;
346
347
348
349
350
351 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
352 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
353
354 while ((ifa = *ifap1) != NULL) {
355 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
356 ifa1->ifa_scope <= ifa->ifa_scope)
357 last_prim = ifa;
358
359 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
360 ifa1->ifa_mask != ifa->ifa_mask ||
361 !inet_ifa_match(ifa1->ifa_address, ifa)) {
362 ifap1 = &ifa->ifa_next;
363 prev_prom = ifa;
364 continue;
365 }
366
367 if (!do_promote) {
368 inet_hash_remove(ifa);
369 *ifap1 = ifa->ifa_next;
370
371 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
372 blocking_notifier_call_chain(&inetaddr_chain,
373 NETDEV_DOWN, ifa);
374 inet_free_ifa(ifa);
375 } else {
376 promote = ifa;
377 break;
378 }
379 }
380 }
381
382
383
384
385
386
387 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
388 if (ifa1->ifa_mask == ifa->ifa_mask &&
389 inet_ifa_match(ifa1->ifa_address, ifa))
390 fib_del_ifaddr(ifa, ifa1);
391 }
392
393no_promotions:
394
395
396 *ifap = ifa1->ifa_next;
397 inet_hash_remove(ifa1);
398
399
400
401
402
403
404
405
406
407
408
409 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
410 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
411
412 if (promote) {
413 struct in_ifaddr *next_sec = promote->ifa_next;
414
415 if (prev_prom) {
416 prev_prom->ifa_next = promote->ifa_next;
417 promote->ifa_next = last_prim->ifa_next;
418 last_prim->ifa_next = promote;
419 }
420
421 promote->ifa_flags &= ~IFA_F_SECONDARY;
422 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
423 blocking_notifier_call_chain(&inetaddr_chain,
424 NETDEV_UP, promote);
425 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
426 if (ifa1->ifa_mask != ifa->ifa_mask ||
427 !inet_ifa_match(ifa1->ifa_address, ifa))
428 continue;
429 fib_add_ifaddr(ifa);
430 }
431
432 }
433 if (destroy)
434 inet_free_ifa(ifa1);
435}
436
437static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
438 int destroy)
439{
440 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
441}
442
443static void check_lifetime(struct work_struct *work);
444
445static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
446
447static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
448 u32 portid, struct netlink_ext_ack *extack)
449{
450 struct in_device *in_dev = ifa->ifa_dev;
451 struct in_ifaddr *ifa1, **ifap, **last_primary;
452 struct in_validator_info ivi;
453 int ret;
454
455 ASSERT_RTNL();
456
457 if (!ifa->ifa_local) {
458 inet_free_ifa(ifa);
459 return 0;
460 }
461
462 ifa->ifa_flags &= ~IFA_F_SECONDARY;
463 last_primary = &in_dev->ifa_list;
464
465 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
466 ifap = &ifa1->ifa_next) {
467 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
468 ifa->ifa_scope <= ifa1->ifa_scope)
469 last_primary = &ifa1->ifa_next;
470 if (ifa1->ifa_mask == ifa->ifa_mask &&
471 inet_ifa_match(ifa1->ifa_address, ifa)) {
472 if (ifa1->ifa_local == ifa->ifa_local) {
473 inet_free_ifa(ifa);
474 return -EEXIST;
475 }
476 if (ifa1->ifa_scope != ifa->ifa_scope) {
477 inet_free_ifa(ifa);
478 return -EINVAL;
479 }
480 ifa->ifa_flags |= IFA_F_SECONDARY;
481 }
482 }
483
484
485
486
487
488
489
490
491 ivi.ivi_addr = ifa->ifa_address;
492 ivi.ivi_dev = ifa->ifa_dev;
493 ivi.extack = extack;
494 ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
495 NETDEV_UP, &ivi);
496 ret = notifier_to_errno(ret);
497 if (ret) {
498 inet_free_ifa(ifa);
499 return ret;
500 }
501
502 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
503 prandom_seed((__force u32) ifa->ifa_local);
504 ifap = last_primary;
505 }
506
507 ifa->ifa_next = *ifap;
508 *ifap = ifa;
509
510 inet_hash_insert(dev_net(in_dev->dev), ifa);
511
512 cancel_delayed_work(&check_lifetime_work);
513 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
514
515
516
517
518 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
519 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
520
521 return 0;
522}
523
524static int inet_insert_ifa(struct in_ifaddr *ifa)
525{
526 return __inet_insert_ifa(ifa, NULL, 0, NULL);
527}
528
529static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
530{
531 struct in_device *in_dev = __in_dev_get_rtnl(dev);
532
533 ASSERT_RTNL();
534
535 if (!in_dev) {
536 inet_free_ifa(ifa);
537 return -ENOBUFS;
538 }
539 ipv4_devconf_setall(in_dev);
540 neigh_parms_data_state_setall(in_dev->arp_parms);
541 if (ifa->ifa_dev != in_dev) {
542 WARN_ON(ifa->ifa_dev);
543 in_dev_hold(in_dev);
544 ifa->ifa_dev = in_dev;
545 }
546 if (ipv4_is_loopback(ifa->ifa_local))
547 ifa->ifa_scope = RT_SCOPE_HOST;
548 return inet_insert_ifa(ifa);
549}
550
551
552
553
554struct in_device *inetdev_by_index(struct net *net, int ifindex)
555{
556 struct net_device *dev;
557 struct in_device *in_dev = NULL;
558
559 rcu_read_lock();
560 dev = dev_get_by_index_rcu(net, ifindex);
561 if (dev)
562 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
563 rcu_read_unlock();
564 return in_dev;
565}
566EXPORT_SYMBOL(inetdev_by_index);
567
568
569
570struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
571 __be32 mask)
572{
573 ASSERT_RTNL();
574
575 for_primary_ifa(in_dev) {
576 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
577 return ifa;
578 } endfor_ifa(in_dev);
579 return NULL;
580}
581
582static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
583{
584 struct ip_mreqn mreq = {
585 .imr_multiaddr.s_addr = ifa->ifa_address,
586 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
587 };
588 int ret;
589
590 ASSERT_RTNL();
591
592 lock_sock(sk);
593 if (join)
594 ret = ip_mc_join_group(sk, &mreq);
595 else
596 ret = ip_mc_leave_group(sk, &mreq);
597 release_sock(sk);
598
599 return ret;
600}
601
602static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
603 struct netlink_ext_ack *extack)
604{
605 struct net *net = sock_net(skb->sk);
606 struct nlattr *tb[IFA_MAX+1];
607 struct in_device *in_dev;
608 struct ifaddrmsg *ifm;
609 struct in_ifaddr *ifa, **ifap;
610 int err = -EINVAL;
611
612 ASSERT_RTNL();
613
614 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy,
615 extack);
616 if (err < 0)
617 goto errout;
618
619 ifm = nlmsg_data(nlh);
620 in_dev = inetdev_by_index(net, ifm->ifa_index);
621 if (!in_dev) {
622 err = -ENODEV;
623 goto errout;
624 }
625
626 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
627 ifap = &ifa->ifa_next) {
628 if (tb[IFA_LOCAL] &&
629 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
630 continue;
631
632 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
633 continue;
634
635 if (tb[IFA_ADDRESS] &&
636 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
637 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
638 continue;
639
640 if (ipv4_is_multicast(ifa->ifa_address))
641 ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
642 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
643 return 0;
644 }
645
646 err = -EADDRNOTAVAIL;
647errout:
648 return err;
649}
650
651#define INFINITY_LIFE_TIME 0xFFFFFFFF
652
653static void check_lifetime(struct work_struct *work)
654{
655 unsigned long now, next, next_sec, next_sched;
656 struct in_ifaddr *ifa;
657 struct hlist_node *n;
658 int i;
659
660 now = jiffies;
661 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
662
663 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
664 bool change_needed = false;
665
666 rcu_read_lock();
667 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
668 unsigned long age;
669
670 if (ifa->ifa_flags & IFA_F_PERMANENT)
671 continue;
672
673
674 age = (now - ifa->ifa_tstamp +
675 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
676
677 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
678 age >= ifa->ifa_valid_lft) {
679 change_needed = true;
680 } else if (ifa->ifa_preferred_lft ==
681 INFINITY_LIFE_TIME) {
682 continue;
683 } else if (age >= ifa->ifa_preferred_lft) {
684 if (time_before(ifa->ifa_tstamp +
685 ifa->ifa_valid_lft * HZ, next))
686 next = ifa->ifa_tstamp +
687 ifa->ifa_valid_lft * HZ;
688
689 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
690 change_needed = true;
691 } else if (time_before(ifa->ifa_tstamp +
692 ifa->ifa_preferred_lft * HZ,
693 next)) {
694 next = ifa->ifa_tstamp +
695 ifa->ifa_preferred_lft * HZ;
696 }
697 }
698 rcu_read_unlock();
699 if (!change_needed)
700 continue;
701 rtnl_lock();
702 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
703 unsigned long age;
704
705 if (ifa->ifa_flags & IFA_F_PERMANENT)
706 continue;
707
708
709 age = (now - ifa->ifa_tstamp +
710 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
711
712 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
713 age >= ifa->ifa_valid_lft) {
714 struct in_ifaddr **ifap;
715
716 for (ifap = &ifa->ifa_dev->ifa_list;
717 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
718 if (*ifap == ifa) {
719 inet_del_ifa(ifa->ifa_dev,
720 ifap, 1);
721 break;
722 }
723 }
724 } else if (ifa->ifa_preferred_lft !=
725 INFINITY_LIFE_TIME &&
726 age >= ifa->ifa_preferred_lft &&
727 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
728 ifa->ifa_flags |= IFA_F_DEPRECATED;
729 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
730 }
731 }
732 rtnl_unlock();
733 }
734
735 next_sec = round_jiffies_up(next);
736 next_sched = next;
737
738
739 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
740 next_sched = next_sec;
741
742 now = jiffies;
743
744 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
745 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
746
747 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
748 next_sched - now);
749}
750
751static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
752 __u32 prefered_lft)
753{
754 unsigned long timeout;
755
756 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
757
758 timeout = addrconf_timeout_fixup(valid_lft, HZ);
759 if (addrconf_finite_timeout(timeout))
760 ifa->ifa_valid_lft = timeout;
761 else
762 ifa->ifa_flags |= IFA_F_PERMANENT;
763
764 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
765 if (addrconf_finite_timeout(timeout)) {
766 if (timeout == 0)
767 ifa->ifa_flags |= IFA_F_DEPRECATED;
768 ifa->ifa_preferred_lft = timeout;
769 }
770 ifa->ifa_tstamp = jiffies;
771 if (!ifa->ifa_cstamp)
772 ifa->ifa_cstamp = ifa->ifa_tstamp;
773}
774
775static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
776 __u32 *pvalid_lft, __u32 *pprefered_lft)
777{
778 struct nlattr *tb[IFA_MAX+1];
779 struct in_ifaddr *ifa;
780 struct ifaddrmsg *ifm;
781 struct net_device *dev;
782 struct in_device *in_dev;
783 int err;
784
785 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy,
786 NULL);
787 if (err < 0)
788 goto errout;
789
790 ifm = nlmsg_data(nlh);
791 err = -EINVAL;
792 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
793 goto errout;
794
795 dev = __dev_get_by_index(net, ifm->ifa_index);
796 err = -ENODEV;
797 if (!dev)
798 goto errout;
799
800 in_dev = __in_dev_get_rtnl(dev);
801 err = -ENOBUFS;
802 if (!in_dev)
803 goto errout;
804
805 ifa = inet_alloc_ifa();
806 if (!ifa)
807
808
809
810
811 goto errout;
812
813 ipv4_devconf_setall(in_dev);
814 neigh_parms_data_state_setall(in_dev->arp_parms);
815 in_dev_hold(in_dev);
816
817 if (!tb[IFA_ADDRESS])
818 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
819
820 INIT_HLIST_NODE(&ifa->hash);
821 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
822 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
823 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
824 ifm->ifa_flags;
825 ifa->ifa_scope = ifm->ifa_scope;
826 ifa->ifa_dev = in_dev;
827
828 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
829 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
830
831 if (tb[IFA_BROADCAST])
832 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
833
834 if (tb[IFA_LABEL])
835 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
836 else
837 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
838
839 if (tb[IFA_RT_PRIORITY])
840 ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
841
842 if (tb[IFA_CACHEINFO]) {
843 struct ifa_cacheinfo *ci;
844
845 ci = nla_data(tb[IFA_CACHEINFO]);
846 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
847 err = -EINVAL;
848 goto errout_free;
849 }
850 *pvalid_lft = ci->ifa_valid;
851 *pprefered_lft = ci->ifa_prefered;
852 }
853
854 return ifa;
855
856errout_free:
857 inet_free_ifa(ifa);
858errout:
859 return ERR_PTR(err);
860}
861
862static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
863{
864 struct in_device *in_dev = ifa->ifa_dev;
865 struct in_ifaddr *ifa1, **ifap;
866
867 if (!ifa->ifa_local)
868 return NULL;
869
870 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
871 ifap = &ifa1->ifa_next) {
872 if (ifa1->ifa_mask == ifa->ifa_mask &&
873 inet_ifa_match(ifa1->ifa_address, ifa) &&
874 ifa1->ifa_local == ifa->ifa_local)
875 return ifa1;
876 }
877 return NULL;
878}
879
880static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
881 struct netlink_ext_ack *extack)
882{
883 struct net *net = sock_net(skb->sk);
884 struct in_ifaddr *ifa;
885 struct in_ifaddr *ifa_existing;
886 __u32 valid_lft = INFINITY_LIFE_TIME;
887 __u32 prefered_lft = INFINITY_LIFE_TIME;
888
889 ASSERT_RTNL();
890
891 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
892 if (IS_ERR(ifa))
893 return PTR_ERR(ifa);
894
895 ifa_existing = find_matching_ifa(ifa);
896 if (!ifa_existing) {
897
898
899
900 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
901 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
902 int ret = ip_mc_config(net->ipv4.mc_autojoin_sk,
903 true, ifa);
904
905 if (ret < 0) {
906 inet_free_ifa(ifa);
907 return ret;
908 }
909 }
910 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
911 extack);
912 } else {
913 u32 new_metric = ifa->ifa_rt_priority;
914
915 inet_free_ifa(ifa);
916
917 if (nlh->nlmsg_flags & NLM_F_EXCL ||
918 !(nlh->nlmsg_flags & NLM_F_REPLACE))
919 return -EEXIST;
920 ifa = ifa_existing;
921
922 if (ifa->ifa_rt_priority != new_metric) {
923 fib_modify_prefix_metric(ifa, new_metric);
924 ifa->ifa_rt_priority = new_metric;
925 }
926
927 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
928 cancel_delayed_work(&check_lifetime_work);
929 queue_delayed_work(system_power_efficient_wq,
930 &check_lifetime_work, 0);
931 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
932 }
933 return 0;
934}
935
936
937
938
939
940static int inet_abc_len(__be32 addr)
941{
942 int rc = -1;
943
944 if (ipv4_is_zeronet(addr))
945 rc = 0;
946 else {
947 __u32 haddr = ntohl(addr);
948
949 if (IN_CLASSA(haddr))
950 rc = 8;
951 else if (IN_CLASSB(haddr))
952 rc = 16;
953 else if (IN_CLASSC(haddr))
954 rc = 24;
955 }
956
957 return rc;
958}
959
960
961int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
962{
963 struct sockaddr_in sin_orig;
964 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
965 struct in_device *in_dev;
966 struct in_ifaddr **ifap = NULL;
967 struct in_ifaddr *ifa = NULL;
968 struct net_device *dev;
969 char *colon;
970 int ret = -EFAULT;
971 int tryaddrmatch = 0;
972
973 ifr->ifr_name[IFNAMSIZ - 1] = 0;
974
975
976 memcpy(&sin_orig, sin, sizeof(*sin));
977
978 colon = strchr(ifr->ifr_name, ':');
979 if (colon)
980 *colon = 0;
981
982 dev_load(net, ifr->ifr_name);
983
984 switch (cmd) {
985 case SIOCGIFADDR:
986 case SIOCGIFBRDADDR:
987 case SIOCGIFDSTADDR:
988 case SIOCGIFNETMASK:
989
990
991
992
993 tryaddrmatch = (sin_orig.sin_family == AF_INET);
994 memset(sin, 0, sizeof(*sin));
995 sin->sin_family = AF_INET;
996 break;
997
998 case SIOCSIFFLAGS:
999 ret = -EPERM;
1000 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1001 goto out;
1002 break;
1003 case SIOCSIFADDR:
1004 case SIOCSIFBRDADDR:
1005 case SIOCSIFDSTADDR:
1006 case SIOCSIFNETMASK:
1007 ret = -EPERM;
1008 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1009 goto out;
1010 ret = -EINVAL;
1011 if (sin->sin_family != AF_INET)
1012 goto out;
1013 break;
1014 default:
1015 ret = -EINVAL;
1016 goto out;
1017 }
1018
1019 rtnl_lock();
1020
1021 ret = -ENODEV;
1022 dev = __dev_get_by_name(net, ifr->ifr_name);
1023 if (!dev)
1024 goto done;
1025
1026 if (colon)
1027 *colon = ':';
1028
1029 in_dev = __in_dev_get_rtnl(dev);
1030 if (in_dev) {
1031 if (tryaddrmatch) {
1032
1033
1034
1035
1036
1037 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1038 ifap = &ifa->ifa_next) {
1039 if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1040 sin_orig.sin_addr.s_addr ==
1041 ifa->ifa_local) {
1042 break;
1043 }
1044 }
1045 }
1046
1047
1048
1049 if (!ifa) {
1050 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1051 ifap = &ifa->ifa_next)
1052 if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1053 break;
1054 }
1055 }
1056
1057 ret = -EADDRNOTAVAIL;
1058 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1059 goto done;
1060
1061 switch (cmd) {
1062 case SIOCGIFADDR:
1063 ret = 0;
1064 sin->sin_addr.s_addr = ifa->ifa_local;
1065 break;
1066
1067 case SIOCGIFBRDADDR:
1068 ret = 0;
1069 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1070 break;
1071
1072 case SIOCGIFDSTADDR:
1073 ret = 0;
1074 sin->sin_addr.s_addr = ifa->ifa_address;
1075 break;
1076
1077 case SIOCGIFNETMASK:
1078 ret = 0;
1079 sin->sin_addr.s_addr = ifa->ifa_mask;
1080 break;
1081
1082 case SIOCSIFFLAGS:
1083 if (colon) {
1084 ret = -EADDRNOTAVAIL;
1085 if (!ifa)
1086 break;
1087 ret = 0;
1088 if (!(ifr->ifr_flags & IFF_UP))
1089 inet_del_ifa(in_dev, ifap, 1);
1090 break;
1091 }
1092 ret = dev_change_flags(dev, ifr->ifr_flags);
1093 break;
1094
1095 case SIOCSIFADDR:
1096 ret = -EINVAL;
1097 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1098 break;
1099
1100 if (!ifa) {
1101 ret = -ENOBUFS;
1102 ifa = inet_alloc_ifa();
1103 if (!ifa)
1104 break;
1105 INIT_HLIST_NODE(&ifa->hash);
1106 if (colon)
1107 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1108 else
1109 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1110 } else {
1111 ret = 0;
1112 if (ifa->ifa_local == sin->sin_addr.s_addr)
1113 break;
1114 inet_del_ifa(in_dev, ifap, 0);
1115 ifa->ifa_broadcast = 0;
1116 ifa->ifa_scope = 0;
1117 }
1118
1119 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1120
1121 if (!(dev->flags & IFF_POINTOPOINT)) {
1122 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1123 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1124 if ((dev->flags & IFF_BROADCAST) &&
1125 ifa->ifa_prefixlen < 31)
1126 ifa->ifa_broadcast = ifa->ifa_address |
1127 ~ifa->ifa_mask;
1128 } else {
1129 ifa->ifa_prefixlen = 32;
1130 ifa->ifa_mask = inet_make_mask(32);
1131 }
1132 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1133 ret = inet_set_ifa(dev, ifa);
1134 break;
1135
1136 case SIOCSIFBRDADDR:
1137 ret = 0;
1138 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1139 inet_del_ifa(in_dev, ifap, 0);
1140 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1141 inet_insert_ifa(ifa);
1142 }
1143 break;
1144
1145 case SIOCSIFDSTADDR:
1146 ret = 0;
1147 if (ifa->ifa_address == sin->sin_addr.s_addr)
1148 break;
1149 ret = -EINVAL;
1150 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1151 break;
1152 ret = 0;
1153 inet_del_ifa(in_dev, ifap, 0);
1154 ifa->ifa_address = sin->sin_addr.s_addr;
1155 inet_insert_ifa(ifa);
1156 break;
1157
1158 case SIOCSIFNETMASK:
1159
1160
1161
1162
1163 ret = -EINVAL;
1164 if (bad_mask(sin->sin_addr.s_addr, 0))
1165 break;
1166 ret = 0;
1167 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1168 __be32 old_mask = ifa->ifa_mask;
1169 inet_del_ifa(in_dev, ifap, 0);
1170 ifa->ifa_mask = sin->sin_addr.s_addr;
1171 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1172
1173
1174
1175
1176
1177
1178
1179 if ((dev->flags & IFF_BROADCAST) &&
1180 (ifa->ifa_prefixlen < 31) &&
1181 (ifa->ifa_broadcast ==
1182 (ifa->ifa_local|~old_mask))) {
1183 ifa->ifa_broadcast = (ifa->ifa_local |
1184 ~sin->sin_addr.s_addr);
1185 }
1186 inet_insert_ifa(ifa);
1187 }
1188 break;
1189 }
1190done:
1191 rtnl_unlock();
1192out:
1193 return ret;
1194}
1195
1196static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1197{
1198 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1199 struct in_ifaddr *ifa;
1200 struct ifreq ifr;
1201 int done = 0;
1202
1203 if (WARN_ON(size > sizeof(struct ifreq)))
1204 goto out;
1205
1206 if (!in_dev)
1207 goto out;
1208
1209 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1210 if (!buf) {
1211 done += size;
1212 continue;
1213 }
1214 if (len < size)
1215 break;
1216 memset(&ifr, 0, sizeof(struct ifreq));
1217 strcpy(ifr.ifr_name, ifa->ifa_label);
1218
1219 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1220 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1221 ifa->ifa_local;
1222
1223 if (copy_to_user(buf + done, &ifr, size)) {
1224 done = -EFAULT;
1225 break;
1226 }
1227 len -= size;
1228 done += size;
1229 }
1230out:
1231 return done;
1232}
1233
1234static __be32 in_dev_select_addr(const struct in_device *in_dev,
1235 int scope)
1236{
1237 for_primary_ifa(in_dev) {
1238 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1239 ifa->ifa_scope <= scope)
1240 return ifa->ifa_local;
1241 } endfor_ifa(in_dev);
1242
1243 return 0;
1244}
1245
1246__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1247{
1248 __be32 addr = 0;
1249 struct in_device *in_dev;
1250 struct net *net = dev_net(dev);
1251 int master_idx;
1252
1253 rcu_read_lock();
1254 in_dev = __in_dev_get_rcu(dev);
1255 if (!in_dev)
1256 goto no_in_dev;
1257
1258 for_primary_ifa(in_dev) {
1259 if (ifa->ifa_scope > scope)
1260 continue;
1261 if (!dst || inet_ifa_match(dst, ifa)) {
1262 addr = ifa->ifa_local;
1263 break;
1264 }
1265 if (!addr)
1266 addr = ifa->ifa_local;
1267 } endfor_ifa(in_dev);
1268
1269 if (addr)
1270 goto out_unlock;
1271no_in_dev:
1272 master_idx = l3mdev_master_ifindex_rcu(dev);
1273
1274
1275
1276
1277
1278
1279 if (master_idx &&
1280 (dev = dev_get_by_index_rcu(net, master_idx)) &&
1281 (in_dev = __in_dev_get_rcu(dev))) {
1282 addr = in_dev_select_addr(in_dev, scope);
1283 if (addr)
1284 goto out_unlock;
1285 }
1286
1287
1288
1289
1290
1291 for_each_netdev_rcu(net, dev) {
1292 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1293 continue;
1294
1295 in_dev = __in_dev_get_rcu(dev);
1296 if (!in_dev)
1297 continue;
1298
1299 addr = in_dev_select_addr(in_dev, scope);
1300 if (addr)
1301 goto out_unlock;
1302 }
1303out_unlock:
1304 rcu_read_unlock();
1305 return addr;
1306}
1307EXPORT_SYMBOL(inet_select_addr);
1308
1309static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1310 __be32 local, int scope)
1311{
1312 int same = 0;
1313 __be32 addr = 0;
1314
1315 for_ifa(in_dev) {
1316 if (!addr &&
1317 (local == ifa->ifa_local || !local) &&
1318 ifa->ifa_scope <= scope) {
1319 addr = ifa->ifa_local;
1320 if (same)
1321 break;
1322 }
1323 if (!same) {
1324 same = (!local || inet_ifa_match(local, ifa)) &&
1325 (!dst || inet_ifa_match(dst, ifa));
1326 if (same && addr) {
1327 if (local || !dst)
1328 break;
1329
1330 if (inet_ifa_match(addr, ifa))
1331 break;
1332
1333 if (ifa->ifa_scope <= scope) {
1334 addr = ifa->ifa_local;
1335 break;
1336 }
1337
1338 same = 0;
1339 }
1340 }
1341 } endfor_ifa(in_dev);
1342
1343 return same ? addr : 0;
1344}
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1355 __be32 dst, __be32 local, int scope)
1356{
1357 __be32 addr = 0;
1358 struct net_device *dev;
1359
1360 if (in_dev)
1361 return confirm_addr_indev(in_dev, dst, local, scope);
1362
1363 rcu_read_lock();
1364 for_each_netdev_rcu(net, dev) {
1365 in_dev = __in_dev_get_rcu(dev);
1366 if (in_dev) {
1367 addr = confirm_addr_indev(in_dev, dst, local, scope);
1368 if (addr)
1369 break;
1370 }
1371 }
1372 rcu_read_unlock();
1373
1374 return addr;
1375}
1376EXPORT_SYMBOL(inet_confirm_addr);
1377
1378
1379
1380
1381
1382int register_inetaddr_notifier(struct notifier_block *nb)
1383{
1384 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1385}
1386EXPORT_SYMBOL(register_inetaddr_notifier);
1387
1388int unregister_inetaddr_notifier(struct notifier_block *nb)
1389{
1390 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1391}
1392EXPORT_SYMBOL(unregister_inetaddr_notifier);
1393
1394int register_inetaddr_validator_notifier(struct notifier_block *nb)
1395{
1396 return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1397}
1398EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1399
1400int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1401{
1402 return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1403 nb);
1404}
1405EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1406
1407
1408
1409
1410static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1411{
1412 struct in_ifaddr *ifa;
1413 int named = 0;
1414
1415 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1416 char old[IFNAMSIZ], *dot;
1417
1418 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1419 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1420 if (named++ == 0)
1421 goto skip;
1422 dot = strchr(old, ':');
1423 if (!dot) {
1424 sprintf(old, ":%d", named);
1425 dot = old;
1426 }
1427 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1428 strcat(ifa->ifa_label, dot);
1429 else
1430 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1431skip:
1432 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1433 }
1434}
1435
1436static bool inetdev_valid_mtu(unsigned int mtu)
1437{
1438 return mtu >= IPV4_MIN_MTU;
1439}
1440
1441static void inetdev_send_gratuitous_arp(struct net_device *dev,
1442 struct in_device *in_dev)
1443
1444{
1445 struct in_ifaddr *ifa;
1446
1447 for (ifa = in_dev->ifa_list; ifa;
1448 ifa = ifa->ifa_next) {
1449 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1450 ifa->ifa_local, dev,
1451 ifa->ifa_local, NULL,
1452 dev->dev_addr, NULL);
1453 }
1454}
1455
1456
1457
1458static int inetdev_event(struct notifier_block *this, unsigned long event,
1459 void *ptr)
1460{
1461 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1462 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1463
1464 ASSERT_RTNL();
1465
1466 if (!in_dev) {
1467 if (event == NETDEV_REGISTER) {
1468 in_dev = inetdev_init(dev);
1469 if (IS_ERR(in_dev))
1470 return notifier_from_errno(PTR_ERR(in_dev));
1471 if (dev->flags & IFF_LOOPBACK) {
1472 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1473 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1474 }
1475 } else if (event == NETDEV_CHANGEMTU) {
1476
1477 if (inetdev_valid_mtu(dev->mtu))
1478 in_dev = inetdev_init(dev);
1479 }
1480 goto out;
1481 }
1482
1483 switch (event) {
1484 case NETDEV_REGISTER:
1485 pr_debug("%s: bug\n", __func__);
1486 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1487 break;
1488 case NETDEV_UP:
1489 if (!inetdev_valid_mtu(dev->mtu))
1490 break;
1491 if (dev->flags & IFF_LOOPBACK) {
1492 struct in_ifaddr *ifa = inet_alloc_ifa();
1493
1494 if (ifa) {
1495 INIT_HLIST_NODE(&ifa->hash);
1496 ifa->ifa_local =
1497 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1498 ifa->ifa_prefixlen = 8;
1499 ifa->ifa_mask = inet_make_mask(8);
1500 in_dev_hold(in_dev);
1501 ifa->ifa_dev = in_dev;
1502 ifa->ifa_scope = RT_SCOPE_HOST;
1503 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1504 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1505 INFINITY_LIFE_TIME);
1506 ipv4_devconf_setall(in_dev);
1507 neigh_parms_data_state_setall(in_dev->arp_parms);
1508 inet_insert_ifa(ifa);
1509 }
1510 }
1511 ip_mc_up(in_dev);
1512
1513 case NETDEV_CHANGEADDR:
1514 if (!IN_DEV_ARP_NOTIFY(in_dev))
1515 break;
1516
1517 case NETDEV_NOTIFY_PEERS:
1518
1519 inetdev_send_gratuitous_arp(dev, in_dev);
1520 break;
1521 case NETDEV_DOWN:
1522 ip_mc_down(in_dev);
1523 break;
1524 case NETDEV_PRE_TYPE_CHANGE:
1525 ip_mc_unmap(in_dev);
1526 break;
1527 case NETDEV_POST_TYPE_CHANGE:
1528 ip_mc_remap(in_dev);
1529 break;
1530 case NETDEV_CHANGEMTU:
1531 if (inetdev_valid_mtu(dev->mtu))
1532 break;
1533
1534
1535 case NETDEV_UNREGISTER:
1536 inetdev_destroy(in_dev);
1537 break;
1538 case NETDEV_CHANGENAME:
1539
1540
1541
1542 inetdev_changename(dev, in_dev);
1543
1544 devinet_sysctl_unregister(in_dev);
1545 devinet_sysctl_register(in_dev);
1546 break;
1547 }
1548out:
1549 return NOTIFY_DONE;
1550}
1551
1552static struct notifier_block ip_netdev_notifier = {
1553 .notifier_call = inetdev_event,
1554};
1555
1556static size_t inet_nlmsg_size(void)
1557{
1558 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1559 + nla_total_size(4)
1560 + nla_total_size(4)
1561 + nla_total_size(4)
1562 + nla_total_size(IFNAMSIZ)
1563 + nla_total_size(4)
1564 + nla_total_size(4)
1565 + nla_total_size(sizeof(struct ifa_cacheinfo));
1566}
1567
1568static inline u32 cstamp_delta(unsigned long cstamp)
1569{
1570 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1571}
1572
1573static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1574 unsigned long tstamp, u32 preferred, u32 valid)
1575{
1576 struct ifa_cacheinfo ci;
1577
1578 ci.cstamp = cstamp_delta(cstamp);
1579 ci.tstamp = cstamp_delta(tstamp);
1580 ci.ifa_prefered = preferred;
1581 ci.ifa_valid = valid;
1582
1583 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1584}
1585
1586static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1587 u32 portid, u32 seq, int event, unsigned int flags)
1588{
1589 struct ifaddrmsg *ifm;
1590 struct nlmsghdr *nlh;
1591 u32 preferred, valid;
1592
1593 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
1594 if (!nlh)
1595 return -EMSGSIZE;
1596
1597 ifm = nlmsg_data(nlh);
1598 ifm->ifa_family = AF_INET;
1599 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1600 ifm->ifa_flags = ifa->ifa_flags;
1601 ifm->ifa_scope = ifa->ifa_scope;
1602 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1603
1604 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1605 preferred = ifa->ifa_preferred_lft;
1606 valid = ifa->ifa_valid_lft;
1607 if (preferred != INFINITY_LIFE_TIME) {
1608 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1609
1610 if (preferred > tval)
1611 preferred -= tval;
1612 else
1613 preferred = 0;
1614 if (valid != INFINITY_LIFE_TIME) {
1615 if (valid > tval)
1616 valid -= tval;
1617 else
1618 valid = 0;
1619 }
1620 }
1621 } else {
1622 preferred = INFINITY_LIFE_TIME;
1623 valid = INFINITY_LIFE_TIME;
1624 }
1625 if ((ifa->ifa_address &&
1626 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1627 (ifa->ifa_local &&
1628 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1629 (ifa->ifa_broadcast &&
1630 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1631 (ifa->ifa_label[0] &&
1632 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1633 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1634 (ifa->ifa_rt_priority &&
1635 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
1636 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1637 preferred, valid))
1638 goto nla_put_failure;
1639
1640 nlmsg_end(skb, nlh);
1641 return 0;
1642
1643nla_put_failure:
1644 nlmsg_cancel(skb, nlh);
1645 return -EMSGSIZE;
1646}
1647
1648static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1649{
1650 struct net *net = sock_net(skb->sk);
1651 int h, s_h;
1652 int idx, s_idx;
1653 int ip_idx, s_ip_idx;
1654 struct net_device *dev;
1655 struct in_device *in_dev;
1656 struct in_ifaddr *ifa;
1657 struct hlist_head *head;
1658
1659 s_h = cb->args[0];
1660 s_idx = idx = cb->args[1];
1661 s_ip_idx = ip_idx = cb->args[2];
1662
1663 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1664 idx = 0;
1665 head = &net->dev_index_head[h];
1666 rcu_read_lock();
1667 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1668 net->dev_base_seq;
1669 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1670 if (idx < s_idx)
1671 goto cont;
1672 if (h > s_h || idx > s_idx)
1673 s_ip_idx = 0;
1674 in_dev = __in_dev_get_rcu(dev);
1675 if (!in_dev)
1676 goto cont;
1677
1678 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1679 ifa = ifa->ifa_next, ip_idx++) {
1680 if (ip_idx < s_ip_idx)
1681 continue;
1682 if (inet_fill_ifaddr(skb, ifa,
1683 NETLINK_CB(cb->skb).portid,
1684 cb->nlh->nlmsg_seq,
1685 RTM_NEWADDR, NLM_F_MULTI) < 0) {
1686 rcu_read_unlock();
1687 goto done;
1688 }
1689 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1690 }
1691cont:
1692 idx++;
1693 }
1694 rcu_read_unlock();
1695 }
1696
1697done:
1698 cb->args[0] = h;
1699 cb->args[1] = idx;
1700 cb->args[2] = ip_idx;
1701
1702 return skb->len;
1703}
1704
1705static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1706 u32 portid)
1707{
1708 struct sk_buff *skb;
1709 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1710 int err = -ENOBUFS;
1711 struct net *net;
1712
1713 net = dev_net(ifa->ifa_dev->dev);
1714 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1715 if (!skb)
1716 goto errout;
1717
1718 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
1719 if (err < 0) {
1720
1721 WARN_ON(err == -EMSGSIZE);
1722 kfree_skb(skb);
1723 goto errout;
1724 }
1725 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1726 return;
1727errout:
1728 if (err < 0)
1729 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1730}
1731
1732static size_t inet_get_link_af_size(const struct net_device *dev,
1733 u32 ext_filter_mask)
1734{
1735 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1736
1737 if (!in_dev)
1738 return 0;
1739
1740 return nla_total_size(IPV4_DEVCONF_MAX * 4);
1741}
1742
1743static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1744 u32 ext_filter_mask)
1745{
1746 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1747 struct nlattr *nla;
1748 int i;
1749
1750 if (!in_dev)
1751 return -ENODATA;
1752
1753 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1754 if (!nla)
1755 return -EMSGSIZE;
1756
1757 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1758 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1759
1760 return 0;
1761}
1762
1763static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1764 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1765};
1766
1767static int inet_validate_link_af(const struct net_device *dev,
1768 const struct nlattr *nla)
1769{
1770 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1771 int err, rem;
1772
1773 if (dev && !__in_dev_get_rcu(dev))
1774 return -EAFNOSUPPORT;
1775
1776 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy, NULL);
1777 if (err < 0)
1778 return err;
1779
1780 if (tb[IFLA_INET_CONF]) {
1781 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1782 int cfgid = nla_type(a);
1783
1784 if (nla_len(a) < 4)
1785 return -EINVAL;
1786
1787 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1788 return -EINVAL;
1789 }
1790 }
1791
1792 return 0;
1793}
1794
1795static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1796{
1797 struct in_device *in_dev = __in_dev_get_rcu(dev);
1798 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1799 int rem;
1800
1801 if (!in_dev)
1802 return -EAFNOSUPPORT;
1803
1804 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
1805 BUG();
1806
1807 if (tb[IFLA_INET_CONF]) {
1808 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1809 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1810 }
1811
1812 return 0;
1813}
1814
1815static int inet_netconf_msgsize_devconf(int type)
1816{
1817 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1818 + nla_total_size(4);
1819 bool all = false;
1820
1821 if (type == NETCONFA_ALL)
1822 all = true;
1823
1824 if (all || type == NETCONFA_FORWARDING)
1825 size += nla_total_size(4);
1826 if (all || type == NETCONFA_RP_FILTER)
1827 size += nla_total_size(4);
1828 if (all || type == NETCONFA_MC_FORWARDING)
1829 size += nla_total_size(4);
1830 if (all || type == NETCONFA_PROXY_NEIGH)
1831 size += nla_total_size(4);
1832 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
1833 size += nla_total_size(4);
1834
1835 return size;
1836}
1837
1838static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1839 struct ipv4_devconf *devconf, u32 portid,
1840 u32 seq, int event, unsigned int flags,
1841 int type)
1842{
1843 struct nlmsghdr *nlh;
1844 struct netconfmsg *ncm;
1845 bool all = false;
1846
1847 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1848 flags);
1849 if (!nlh)
1850 return -EMSGSIZE;
1851
1852 if (type == NETCONFA_ALL)
1853 all = true;
1854
1855 ncm = nlmsg_data(nlh);
1856 ncm->ncm_family = AF_INET;
1857
1858 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1859 goto nla_put_failure;
1860
1861 if (!devconf)
1862 goto out;
1863
1864 if ((all || type == NETCONFA_FORWARDING) &&
1865 nla_put_s32(skb, NETCONFA_FORWARDING,
1866 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1867 goto nla_put_failure;
1868 if ((all || type == NETCONFA_RP_FILTER) &&
1869 nla_put_s32(skb, NETCONFA_RP_FILTER,
1870 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1871 goto nla_put_failure;
1872 if ((all || type == NETCONFA_MC_FORWARDING) &&
1873 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1874 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1875 goto nla_put_failure;
1876 if ((all || type == NETCONFA_PROXY_NEIGH) &&
1877 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
1878 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1879 goto nla_put_failure;
1880 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
1881 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
1882 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
1883 goto nla_put_failure;
1884
1885out:
1886 nlmsg_end(skb, nlh);
1887 return 0;
1888
1889nla_put_failure:
1890 nlmsg_cancel(skb, nlh);
1891 return -EMSGSIZE;
1892}
1893
1894void inet_netconf_notify_devconf(struct net *net, int event, int type,
1895 int ifindex, struct ipv4_devconf *devconf)
1896{
1897 struct sk_buff *skb;
1898 int err = -ENOBUFS;
1899
1900 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
1901 if (!skb)
1902 goto errout;
1903
1904 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1905 event, 0, type);
1906 if (err < 0) {
1907
1908 WARN_ON(err == -EMSGSIZE);
1909 kfree_skb(skb);
1910 goto errout;
1911 }
1912 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
1913 return;
1914errout:
1915 if (err < 0)
1916 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1917}
1918
1919static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1920 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1921 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
1922 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
1923 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
1924 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
1925};
1926
1927static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1928 struct nlmsghdr *nlh,
1929 struct netlink_ext_ack *extack)
1930{
1931 struct net *net = sock_net(in_skb->sk);
1932 struct nlattr *tb[NETCONFA_MAX+1];
1933 struct netconfmsg *ncm;
1934 struct sk_buff *skb;
1935 struct ipv4_devconf *devconf;
1936 struct in_device *in_dev;
1937 struct net_device *dev;
1938 int ifindex;
1939 int err;
1940
1941 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1942 devconf_ipv4_policy, extack);
1943 if (err < 0)
1944 goto errout;
1945
1946 err = -EINVAL;
1947 if (!tb[NETCONFA_IFINDEX])
1948 goto errout;
1949
1950 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1951 switch (ifindex) {
1952 case NETCONFA_IFINDEX_ALL:
1953 devconf = net->ipv4.devconf_all;
1954 break;
1955 case NETCONFA_IFINDEX_DEFAULT:
1956 devconf = net->ipv4.devconf_dflt;
1957 break;
1958 default:
1959 dev = __dev_get_by_index(net, ifindex);
1960 if (!dev)
1961 goto errout;
1962 in_dev = __in_dev_get_rtnl(dev);
1963 if (!in_dev)
1964 goto errout;
1965 devconf = &in_dev->cnf;
1966 break;
1967 }
1968
1969 err = -ENOBUFS;
1970 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1971 if (!skb)
1972 goto errout;
1973
1974 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1975 NETLINK_CB(in_skb).portid,
1976 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1977 NETCONFA_ALL);
1978 if (err < 0) {
1979
1980 WARN_ON(err == -EMSGSIZE);
1981 kfree_skb(skb);
1982 goto errout;
1983 }
1984 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1985errout:
1986 return err;
1987}
1988
1989static int inet_netconf_dump_devconf(struct sk_buff *skb,
1990 struct netlink_callback *cb)
1991{
1992 struct net *net = sock_net(skb->sk);
1993 int h, s_h;
1994 int idx, s_idx;
1995 struct net_device *dev;
1996 struct in_device *in_dev;
1997 struct hlist_head *head;
1998
1999 s_h = cb->args[0];
2000 s_idx = idx = cb->args[1];
2001
2002 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2003 idx = 0;
2004 head = &net->dev_index_head[h];
2005 rcu_read_lock();
2006 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
2007 net->dev_base_seq;
2008 hlist_for_each_entry_rcu(dev, head, index_hlist) {
2009 if (idx < s_idx)
2010 goto cont;
2011 in_dev = __in_dev_get_rcu(dev);
2012 if (!in_dev)
2013 goto cont;
2014
2015 if (inet_netconf_fill_devconf(skb, dev->ifindex,
2016 &in_dev->cnf,
2017 NETLINK_CB(cb->skb).portid,
2018 cb->nlh->nlmsg_seq,
2019 RTM_NEWNETCONF,
2020 NLM_F_MULTI,
2021 NETCONFA_ALL) < 0) {
2022 rcu_read_unlock();
2023 goto done;
2024 }
2025 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2026cont:
2027 idx++;
2028 }
2029 rcu_read_unlock();
2030 }
2031 if (h == NETDEV_HASHENTRIES) {
2032 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2033 net->ipv4.devconf_all,
2034 NETLINK_CB(cb->skb).portid,
2035 cb->nlh->nlmsg_seq,
2036 RTM_NEWNETCONF, NLM_F_MULTI,
2037 NETCONFA_ALL) < 0)
2038 goto done;
2039 else
2040 h++;
2041 }
2042 if (h == NETDEV_HASHENTRIES + 1) {
2043 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2044 net->ipv4.devconf_dflt,
2045 NETLINK_CB(cb->skb).portid,
2046 cb->nlh->nlmsg_seq,
2047 RTM_NEWNETCONF, NLM_F_MULTI,
2048 NETCONFA_ALL) < 0)
2049 goto done;
2050 else
2051 h++;
2052 }
2053done:
2054 cb->args[0] = h;
2055 cb->args[1] = idx;
2056
2057 return skb->len;
2058}
2059
2060#ifdef CONFIG_SYSCTL
2061
2062static void devinet_copy_dflt_conf(struct net *net, int i)
2063{
2064 struct net_device *dev;
2065
2066 rcu_read_lock();
2067 for_each_netdev_rcu(net, dev) {
2068 struct in_device *in_dev;
2069
2070 in_dev = __in_dev_get_rcu(dev);
2071 if (in_dev && !test_bit(i, in_dev->cnf.state))
2072 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2073 }
2074 rcu_read_unlock();
2075}
2076
2077
2078static void inet_forward_change(struct net *net)
2079{
2080 struct net_device *dev;
2081 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2082
2083 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2084 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2085 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2086 NETCONFA_FORWARDING,
2087 NETCONFA_IFINDEX_ALL,
2088 net->ipv4.devconf_all);
2089 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2090 NETCONFA_FORWARDING,
2091 NETCONFA_IFINDEX_DEFAULT,
2092 net->ipv4.devconf_dflt);
2093
2094 for_each_netdev(net, dev) {
2095 struct in_device *in_dev;
2096
2097 if (on)
2098 dev_disable_lro(dev);
2099
2100 in_dev = __in_dev_get_rtnl(dev);
2101 if (in_dev) {
2102 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2103 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2104 NETCONFA_FORWARDING,
2105 dev->ifindex, &in_dev->cnf);
2106 }
2107 }
2108}
2109
2110static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2111{
2112 if (cnf == net->ipv4.devconf_dflt)
2113 return NETCONFA_IFINDEX_DEFAULT;
2114 else if (cnf == net->ipv4.devconf_all)
2115 return NETCONFA_IFINDEX_ALL;
2116 else {
2117 struct in_device *idev
2118 = container_of(cnf, struct in_device, cnf);
2119 return idev->dev->ifindex;
2120 }
2121}
2122
2123static int devinet_conf_proc(struct ctl_table *ctl, int write,
2124 void __user *buffer,
2125 size_t *lenp, loff_t *ppos)
2126{
2127 int old_value = *(int *)ctl->data;
2128 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2129 int new_value = *(int *)ctl->data;
2130
2131 if (write) {
2132 struct ipv4_devconf *cnf = ctl->extra1;
2133 struct net *net = ctl->extra2;
2134 int i = (int *)ctl->data - cnf->data;
2135 int ifindex;
2136
2137 set_bit(i, cnf->state);
2138
2139 if (cnf == net->ipv4.devconf_dflt)
2140 devinet_copy_dflt_conf(net, i);
2141 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2142 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2143 if ((new_value == 0) && (old_value != 0))
2144 rt_cache_flush(net);
2145
2146 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2147 new_value != old_value) {
2148 ifindex = devinet_conf_ifindex(net, cnf);
2149 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2150 NETCONFA_RP_FILTER,
2151 ifindex, cnf);
2152 }
2153 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2154 new_value != old_value) {
2155 ifindex = devinet_conf_ifindex(net, cnf);
2156 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2157 NETCONFA_PROXY_NEIGH,
2158 ifindex, cnf);
2159 }
2160 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2161 new_value != old_value) {
2162 ifindex = devinet_conf_ifindex(net, cnf);
2163 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2164 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2165 ifindex, cnf);
2166 }
2167 }
2168
2169 return ret;
2170}
2171
2172static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2173 void __user *buffer,
2174 size_t *lenp, loff_t *ppos)
2175{
2176 int *valp = ctl->data;
2177 int val = *valp;
2178 loff_t pos = *ppos;
2179 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2180
2181 if (write && *valp != val) {
2182 struct net *net = ctl->extra2;
2183
2184 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2185 if (!rtnl_trylock()) {
2186
2187 *valp = val;
2188 *ppos = pos;
2189 return restart_syscall();
2190 }
2191 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2192 inet_forward_change(net);
2193 } else {
2194 struct ipv4_devconf *cnf = ctl->extra1;
2195 struct in_device *idev =
2196 container_of(cnf, struct in_device, cnf);
2197 if (*valp)
2198 dev_disable_lro(idev->dev);
2199 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2200 NETCONFA_FORWARDING,
2201 idev->dev->ifindex,
2202 cnf);
2203 }
2204 rtnl_unlock();
2205 rt_cache_flush(net);
2206 } else
2207 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2208 NETCONFA_FORWARDING,
2209 NETCONFA_IFINDEX_DEFAULT,
2210 net->ipv4.devconf_dflt);
2211 }
2212
2213 return ret;
2214}
2215
2216static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2217 void __user *buffer,
2218 size_t *lenp, loff_t *ppos)
2219{
2220 int *valp = ctl->data;
2221 int val = *valp;
2222 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2223 struct net *net = ctl->extra2;
2224
2225 if (write && *valp != val)
2226 rt_cache_flush(net);
2227
2228 return ret;
2229}
2230
2231#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2232 { \
2233 .procname = name, \
2234 .data = ipv4_devconf.data + \
2235 IPV4_DEVCONF_ ## attr - 1, \
2236 .maxlen = sizeof(int), \
2237 .mode = mval, \
2238 .proc_handler = proc, \
2239 .extra1 = &ipv4_devconf, \
2240 }
2241
2242#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2243 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2244
2245#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2246 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2247
2248#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2249 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2250
2251#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2252 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2253
2254static struct devinet_sysctl_table {
2255 struct ctl_table_header *sysctl_header;
2256 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2257} devinet_sysctl = {
2258 .devinet_vars = {
2259 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2260 devinet_sysctl_forward),
2261 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2262
2263 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2264 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2265 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2266 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2267 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2268 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2269 "accept_source_route"),
2270 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2271 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2272 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2273 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2274 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2275 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2276 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2277 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2278 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2279 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2280 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2281 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2282 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2283 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2284 "force_igmp_version"),
2285 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2286 "igmpv2_unsolicited_report_interval"),
2287 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2288 "igmpv3_unsolicited_report_interval"),
2289 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2290 "ignore_routes_with_linkdown"),
2291 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2292 "drop_gratuitous_arp"),
2293
2294 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2295 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2296 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2297 "promote_secondaries"),
2298 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2299 "route_localnet"),
2300 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2301 "drop_unicast_in_l2_multicast"),
2302 },
2303};
2304
2305static int __devinet_sysctl_register(struct net *net, char *dev_name,
2306 int ifindex, struct ipv4_devconf *p)
2307{
2308 int i;
2309 struct devinet_sysctl_table *t;
2310 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2311
2312 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2313 if (!t)
2314 goto out;
2315
2316 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2317 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2318 t->devinet_vars[i].extra1 = p;
2319 t->devinet_vars[i].extra2 = net;
2320 }
2321
2322 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2323
2324 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2325 if (!t->sysctl_header)
2326 goto free;
2327
2328 p->sysctl = t;
2329
2330 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2331 ifindex, p);
2332 return 0;
2333
2334free:
2335 kfree(t);
2336out:
2337 return -ENOBUFS;
2338}
2339
2340static void __devinet_sysctl_unregister(struct net *net,
2341 struct ipv4_devconf *cnf, int ifindex)
2342{
2343 struct devinet_sysctl_table *t = cnf->sysctl;
2344
2345 if (t) {
2346 cnf->sysctl = NULL;
2347 unregister_net_sysctl_table(t->sysctl_header);
2348 kfree(t);
2349 }
2350
2351 inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
2352}
2353
2354static int devinet_sysctl_register(struct in_device *idev)
2355{
2356 int err;
2357
2358 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2359 return -EINVAL;
2360
2361 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2362 if (err)
2363 return err;
2364 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2365 idev->dev->ifindex, &idev->cnf);
2366 if (err)
2367 neigh_sysctl_unregister(idev->arp_parms);
2368 return err;
2369}
2370
2371static void devinet_sysctl_unregister(struct in_device *idev)
2372{
2373 struct net *net = dev_net(idev->dev);
2374
2375 __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2376 neigh_sysctl_unregister(idev->arp_parms);
2377}
2378
2379static struct ctl_table ctl_forward_entry[] = {
2380 {
2381 .procname = "ip_forward",
2382 .data = &ipv4_devconf.data[
2383 IPV4_DEVCONF_FORWARDING - 1],
2384 .maxlen = sizeof(int),
2385 .mode = 0644,
2386 .proc_handler = devinet_sysctl_forward,
2387 .extra1 = &ipv4_devconf,
2388 .extra2 = &init_net,
2389 },
2390 { },
2391};
2392#endif
2393
2394static __net_init int devinet_init_net(struct net *net)
2395{
2396 int err;
2397 struct ipv4_devconf *all, *dflt;
2398#ifdef CONFIG_SYSCTL
2399 struct ctl_table *tbl = ctl_forward_entry;
2400 struct ctl_table_header *forw_hdr;
2401#endif
2402
2403 err = -ENOMEM;
2404 all = &ipv4_devconf;
2405 dflt = &ipv4_devconf_dflt;
2406
2407 if (!net_eq(net, &init_net)) {
2408 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2409 if (!all)
2410 goto err_alloc_all;
2411
2412 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2413 if (!dflt)
2414 goto err_alloc_dflt;
2415
2416#ifdef CONFIG_SYSCTL
2417 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2418 if (!tbl)
2419 goto err_alloc_ctl;
2420
2421 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2422 tbl[0].extra1 = all;
2423 tbl[0].extra2 = net;
2424#endif
2425 }
2426
2427#ifdef CONFIG_SYSCTL
2428 err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2429 if (err < 0)
2430 goto err_reg_all;
2431
2432 err = __devinet_sysctl_register(net, "default",
2433 NETCONFA_IFINDEX_DEFAULT, dflt);
2434 if (err < 0)
2435 goto err_reg_dflt;
2436
2437 err = -ENOMEM;
2438 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2439 if (!forw_hdr)
2440 goto err_reg_ctl;
2441 net->ipv4.forw_hdr = forw_hdr;
2442#endif
2443
2444 net->ipv4.devconf_all = all;
2445 net->ipv4.devconf_dflt = dflt;
2446 return 0;
2447
2448#ifdef CONFIG_SYSCTL
2449err_reg_ctl:
2450 __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2451err_reg_dflt:
2452 __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2453err_reg_all:
2454 if (tbl != ctl_forward_entry)
2455 kfree(tbl);
2456err_alloc_ctl:
2457#endif
2458 if (dflt != &ipv4_devconf_dflt)
2459 kfree(dflt);
2460err_alloc_dflt:
2461 if (all != &ipv4_devconf)
2462 kfree(all);
2463err_alloc_all:
2464 return err;
2465}
2466
2467static __net_exit void devinet_exit_net(struct net *net)
2468{
2469#ifdef CONFIG_SYSCTL
2470 struct ctl_table *tbl;
2471
2472 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2473 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2474 __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2475 NETCONFA_IFINDEX_DEFAULT);
2476 __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2477 NETCONFA_IFINDEX_ALL);
2478 kfree(tbl);
2479#endif
2480 kfree(net->ipv4.devconf_dflt);
2481 kfree(net->ipv4.devconf_all);
2482}
2483
2484static __net_initdata struct pernet_operations devinet_ops = {
2485 .init = devinet_init_net,
2486 .exit = devinet_exit_net,
2487};
2488
2489static struct rtnl_af_ops inet_af_ops __read_mostly = {
2490 .family = AF_INET,
2491 .fill_link_af = inet_fill_link_af,
2492 .get_link_af_size = inet_get_link_af_size,
2493 .validate_link_af = inet_validate_link_af,
2494 .set_link_af = inet_set_link_af,
2495};
2496
2497void __init devinet_init(void)
2498{
2499 int i;
2500
2501 BUILD_BUG_ON(__IPV4_DEVCONF_MAX > RH_KABI_IPV4_DEVCONF_STORAGE);
2502
2503 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2504 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2505
2506 register_pernet_subsys(&devinet_ops);
2507
2508 register_gifconf(PF_INET, inet_gifconf);
2509 register_netdevice_notifier(&ip_netdev_notifier);
2510
2511 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2512
2513 rtnl_af_register(&inet_af_ops);
2514
2515 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2516 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2517 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
2518 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2519 inet_netconf_dump_devconf, 0);
2520}
2521
