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