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