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29#include <asm/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/string.h>
36#include <linux/mm.h>
37#include <linux/socket.h>
38#include <linux/sockios.h>
39#include <linux/in.h>
40#include <linux/errno.h>
41#include <linux/interrupt.h>
42#include <linux/if_addr.h>
43#include <linux/if_ether.h>
44#include <linux/inet.h>
45#include <linux/netdevice.h>
46#include <linux/etherdevice.h>
47#include <linux/skbuff.h>
48#include <linux/init.h>
49#include <linux/notifier.h>
50#include <linux/inetdevice.h>
51#include <linux/igmp.h>
52#include <linux/slab.h>
53#include <linux/hash.h>
54#ifdef CONFIG_SYSCTL
55#include <linux/sysctl.h>
56#endif
57#include <linux/kmod.h>
58#include <linux/netconf.h>
59
60#include <net/arp.h>
61#include <net/ip.h>
62#include <net/route.h>
63#include <net/ip_fib.h>
64#include <net/rtnetlink.h>
65#include <net/net_namespace.h>
66#include <net/addrconf.h>
67
68#include "fib_lookup.h"
69
70static struct ipv4_devconf ipv4_devconf = {
71 .data = {
72 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
75 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
76 },
77};
78
79static struct ipv4_devconf ipv4_devconf_dflt = {
80 .data = {
81 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
82 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
83 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
85 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
86 },
87};
88
89#define IPV4_DEVCONF_DFLT(net, attr) \
90 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
91
92static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
93 [IFA_LOCAL] = { .type = NLA_U32 },
94 [IFA_ADDRESS] = { .type = NLA_U32 },
95 [IFA_BROADCAST] = { .type = NLA_U32 },
96 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
97 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
98};
99
100#define IN4_ADDR_HSIZE_SHIFT 8
101#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
102
103static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
104static DEFINE_SPINLOCK(inet_addr_hash_lock);
105
106static u32 inet_addr_hash(struct net *net, __be32 addr)
107{
108 u32 val = (__force u32) addr ^ net_hash_mix(net);
109
110 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
111}
112
113static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
114{
115 u32 hash = inet_addr_hash(net, ifa->ifa_local);
116
117 spin_lock(&inet_addr_hash_lock);
118 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
119 spin_unlock(&inet_addr_hash_lock);
120}
121
122static void inet_hash_remove(struct in_ifaddr *ifa)
123{
124 spin_lock(&inet_addr_hash_lock);
125 hlist_del_init_rcu(&ifa->hash);
126 spin_unlock(&inet_addr_hash_lock);
127}
128
129
130
131
132
133
134
135
136
137struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
138{
139 u32 hash = inet_addr_hash(net, addr);
140 struct net_device *result = NULL;
141 struct in_ifaddr *ifa;
142
143 rcu_read_lock();
144 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
145 if (ifa->ifa_local == addr) {
146 struct net_device *dev = ifa->ifa_dev->dev;
147
148 if (!net_eq(dev_net(dev), net))
149 continue;
150 result = dev;
151 break;
152 }
153 }
154 if (!result) {
155 struct flowi4 fl4 = { .daddr = addr };
156 struct fib_result res = { 0 };
157 struct fib_table *local;
158
159
160
161
162 local = fib_get_table(net, RT_TABLE_LOCAL);
163 if (local &&
164 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
165 res.type == RTN_LOCAL)
166 result = FIB_RES_DEV(res);
167 }
168 if (result && devref)
169 dev_hold(result);
170 rcu_read_unlock();
171 return result;
172}
173EXPORT_SYMBOL(__ip_dev_find);
174
175static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
176
177static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
178static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
179 int destroy);
180#ifdef CONFIG_SYSCTL
181static void devinet_sysctl_register(struct in_device *idev);
182static void devinet_sysctl_unregister(struct in_device *idev);
183#else
184static void devinet_sysctl_register(struct in_device *idev)
185{
186}
187static void devinet_sysctl_unregister(struct in_device *idev)
188{
189}
190#endif
191
192
193
194static struct in_ifaddr *inet_alloc_ifa(void)
195{
196 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
197}
198
199static void inet_rcu_free_ifa(struct rcu_head *head)
200{
201 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
202 if (ifa->ifa_dev)
203 in_dev_put(ifa->ifa_dev);
204 kfree(ifa);
205}
206
207static void inet_free_ifa(struct in_ifaddr *ifa)
208{
209 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
210}
211
212void in_dev_finish_destroy(struct in_device *idev)
213{
214 struct net_device *dev = idev->dev;
215
216 WARN_ON(idev->ifa_list);
217 WARN_ON(idev->mc_list);
218 kfree(rcu_dereference_protected(idev->mc_hash, 1));
219#ifdef NET_REFCNT_DEBUG
220 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
221#endif
222 dev_put(dev);
223 if (!idev->dead)
224 pr_err("Freeing alive in_device %p\n", idev);
225 else
226 kfree(idev);
227}
228EXPORT_SYMBOL(in_dev_finish_destroy);
229
230static struct in_device *inetdev_init(struct net_device *dev)
231{
232 struct in_device *in_dev;
233
234 ASSERT_RTNL();
235
236 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
237 if (!in_dev)
238 goto out;
239 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
240 sizeof(in_dev->cnf));
241 in_dev->cnf.sysctl = NULL;
242 in_dev->dev = dev;
243 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
244 if (!in_dev->arp_parms)
245 goto out_kfree;
246 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
247 dev_disable_lro(dev);
248
249 dev_hold(dev);
250
251 in_dev_hold(in_dev);
252
253 devinet_sysctl_register(in_dev);
254 ip_mc_init_dev(in_dev);
255 if (dev->flags & IFF_UP)
256 ip_mc_up(in_dev);
257
258
259 rcu_assign_pointer(dev->ip_ptr, in_dev);
260out:
261 return in_dev;
262out_kfree:
263 kfree(in_dev);
264 in_dev = NULL;
265 goto out;
266}
267
268static void in_dev_rcu_put(struct rcu_head *head)
269{
270 struct in_device *idev = container_of(head, struct in_device, rcu_head);
271 in_dev_put(idev);
272}
273
274static void inetdev_destroy(struct in_device *in_dev)
275{
276 struct in_ifaddr *ifa;
277 struct net_device *dev;
278
279 ASSERT_RTNL();
280
281 dev = in_dev->dev;
282
283 in_dev->dead = 1;
284
285 ip_mc_destroy_dev(in_dev);
286
287 while ((ifa = in_dev->ifa_list) != NULL) {
288 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
289 inet_free_ifa(ifa);
290 }
291
292 RCU_INIT_POINTER(dev->ip_ptr, NULL);
293
294 devinet_sysctl_unregister(in_dev);
295 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
296 arp_ifdown(dev);
297
298 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
299}
300
301int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
302{
303 rcu_read_lock();
304 for_primary_ifa(in_dev) {
305 if (inet_ifa_match(a, ifa)) {
306 if (!b || inet_ifa_match(b, ifa)) {
307 rcu_read_unlock();
308 return 1;
309 }
310 }
311 } endfor_ifa(in_dev);
312 rcu_read_unlock();
313 return 0;
314}
315
316static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
317 int destroy, struct nlmsghdr *nlh, u32 portid)
318{
319 struct in_ifaddr *promote = NULL;
320 struct in_ifaddr *ifa, *ifa1 = *ifap;
321 struct in_ifaddr *last_prim = in_dev->ifa_list;
322 struct in_ifaddr *prev_prom = NULL;
323 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
324
325 ASSERT_RTNL();
326
327
328
329
330
331 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
332 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
333
334 while ((ifa = *ifap1) != NULL) {
335 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
336 ifa1->ifa_scope <= ifa->ifa_scope)
337 last_prim = ifa;
338
339 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
340 ifa1->ifa_mask != ifa->ifa_mask ||
341 !inet_ifa_match(ifa1->ifa_address, ifa)) {
342 ifap1 = &ifa->ifa_next;
343 prev_prom = ifa;
344 continue;
345 }
346
347 if (!do_promote) {
348 inet_hash_remove(ifa);
349 *ifap1 = ifa->ifa_next;
350
351 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
352 blocking_notifier_call_chain(&inetaddr_chain,
353 NETDEV_DOWN, ifa);
354 inet_free_ifa(ifa);
355 } else {
356 promote = ifa;
357 break;
358 }
359 }
360 }
361
362
363
364
365
366
367 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
368 if (ifa1->ifa_mask == ifa->ifa_mask &&
369 inet_ifa_match(ifa1->ifa_address, ifa))
370 fib_del_ifaddr(ifa, ifa1);
371 }
372
373
374
375 *ifap = ifa1->ifa_next;
376 inet_hash_remove(ifa1);
377
378
379
380
381
382
383
384
385
386
387
388 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
389 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
390
391 if (promote) {
392 struct in_ifaddr *next_sec = promote->ifa_next;
393
394 if (prev_prom) {
395 prev_prom->ifa_next = promote->ifa_next;
396 promote->ifa_next = last_prim->ifa_next;
397 last_prim->ifa_next = promote;
398 }
399
400 promote->ifa_flags &= ~IFA_F_SECONDARY;
401 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
402 blocking_notifier_call_chain(&inetaddr_chain,
403 NETDEV_UP, promote);
404 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
405 if (ifa1->ifa_mask != ifa->ifa_mask ||
406 !inet_ifa_match(ifa1->ifa_address, ifa))
407 continue;
408 fib_add_ifaddr(ifa);
409 }
410
411 }
412 if (destroy)
413 inet_free_ifa(ifa1);
414}
415
416static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
417 int destroy)
418{
419 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
420}
421
422static void check_lifetime(struct work_struct *work);
423
424static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
425
426static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
427 u32 portid)
428{
429 struct in_device *in_dev = ifa->ifa_dev;
430 struct in_ifaddr *ifa1, **ifap, **last_primary;
431
432 ASSERT_RTNL();
433
434 if (!ifa->ifa_local) {
435 inet_free_ifa(ifa);
436 return 0;
437 }
438
439 ifa->ifa_flags &= ~IFA_F_SECONDARY;
440 last_primary = &in_dev->ifa_list;
441
442 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
443 ifap = &ifa1->ifa_next) {
444 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
445 ifa->ifa_scope <= ifa1->ifa_scope)
446 last_primary = &ifa1->ifa_next;
447 if (ifa1->ifa_mask == ifa->ifa_mask &&
448 inet_ifa_match(ifa1->ifa_address, ifa)) {
449 if (ifa1->ifa_local == ifa->ifa_local) {
450 inet_free_ifa(ifa);
451 return -EEXIST;
452 }
453 if (ifa1->ifa_scope != ifa->ifa_scope) {
454 inet_free_ifa(ifa);
455 return -EINVAL;
456 }
457 ifa->ifa_flags |= IFA_F_SECONDARY;
458 }
459 }
460
461 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
462 net_srandom(ifa->ifa_local);
463 ifap = last_primary;
464 }
465
466 ifa->ifa_next = *ifap;
467 *ifap = ifa;
468
469 inet_hash_insert(dev_net(in_dev->dev), ifa);
470
471 cancel_delayed_work(&check_lifetime_work);
472 schedule_delayed_work(&check_lifetime_work, 0);
473
474
475
476
477 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
478 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
479
480 return 0;
481}
482
483static int inet_insert_ifa(struct in_ifaddr *ifa)
484{
485 return __inet_insert_ifa(ifa, NULL, 0);
486}
487
488static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
489{
490 struct in_device *in_dev = __in_dev_get_rtnl(dev);
491
492 ASSERT_RTNL();
493
494 if (!in_dev) {
495 inet_free_ifa(ifa);
496 return -ENOBUFS;
497 }
498 ipv4_devconf_setall(in_dev);
499 if (ifa->ifa_dev != in_dev) {
500 WARN_ON(ifa->ifa_dev);
501 in_dev_hold(in_dev);
502 ifa->ifa_dev = in_dev;
503 }
504 if (ipv4_is_loopback(ifa->ifa_local))
505 ifa->ifa_scope = RT_SCOPE_HOST;
506 return inet_insert_ifa(ifa);
507}
508
509
510
511
512struct in_device *inetdev_by_index(struct net *net, int ifindex)
513{
514 struct net_device *dev;
515 struct in_device *in_dev = NULL;
516
517 rcu_read_lock();
518 dev = dev_get_by_index_rcu(net, ifindex);
519 if (dev)
520 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
521 rcu_read_unlock();
522 return in_dev;
523}
524EXPORT_SYMBOL(inetdev_by_index);
525
526
527
528struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
529 __be32 mask)
530{
531 ASSERT_RTNL();
532
533 for_primary_ifa(in_dev) {
534 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
535 return ifa;
536 } endfor_ifa(in_dev);
537 return NULL;
538}
539
540static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
541{
542 struct net *net = sock_net(skb->sk);
543 struct nlattr *tb[IFA_MAX+1];
544 struct in_device *in_dev;
545 struct ifaddrmsg *ifm;
546 struct in_ifaddr *ifa, **ifap;
547 int err = -EINVAL;
548
549 ASSERT_RTNL();
550
551 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
552 if (err < 0)
553 goto errout;
554
555 ifm = nlmsg_data(nlh);
556 in_dev = inetdev_by_index(net, ifm->ifa_index);
557 if (in_dev == NULL) {
558 err = -ENODEV;
559 goto errout;
560 }
561
562 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
563 ifap = &ifa->ifa_next) {
564 if (tb[IFA_LOCAL] &&
565 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
566 continue;
567
568 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
569 continue;
570
571 if (tb[IFA_ADDRESS] &&
572 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
573 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
574 continue;
575
576 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
577 return 0;
578 }
579
580 err = -EADDRNOTAVAIL;
581errout:
582 return err;
583}
584
585#define INFINITY_LIFE_TIME 0xFFFFFFFF
586
587static void check_lifetime(struct work_struct *work)
588{
589 unsigned long now, next, next_sec, next_sched;
590 struct in_ifaddr *ifa;
591 struct hlist_node *n;
592 int i;
593
594 now = jiffies;
595 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
596
597 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
598 bool change_needed = false;
599
600 rcu_read_lock();
601 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
602 unsigned long age;
603
604 if (ifa->ifa_flags & IFA_F_PERMANENT)
605 continue;
606
607
608 age = (now - ifa->ifa_tstamp +
609 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
610
611 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
612 age >= ifa->ifa_valid_lft) {
613 change_needed = true;
614 } else if (ifa->ifa_preferred_lft ==
615 INFINITY_LIFE_TIME) {
616 continue;
617 } else if (age >= ifa->ifa_preferred_lft) {
618 if (time_before(ifa->ifa_tstamp +
619 ifa->ifa_valid_lft * HZ, next))
620 next = ifa->ifa_tstamp +
621 ifa->ifa_valid_lft * HZ;
622
623 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
624 change_needed = true;
625 } else if (time_before(ifa->ifa_tstamp +
626 ifa->ifa_preferred_lft * HZ,
627 next)) {
628 next = ifa->ifa_tstamp +
629 ifa->ifa_preferred_lft * HZ;
630 }
631 }
632 rcu_read_unlock();
633 if (!change_needed)
634 continue;
635 rtnl_lock();
636 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
637 unsigned long age;
638
639 if (ifa->ifa_flags & IFA_F_PERMANENT)
640 continue;
641
642
643 age = (now - ifa->ifa_tstamp +
644 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
645
646 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
647 age >= ifa->ifa_valid_lft) {
648 struct in_ifaddr **ifap;
649
650 for (ifap = &ifa->ifa_dev->ifa_list;
651 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
652 if (*ifap == ifa) {
653 inet_del_ifa(ifa->ifa_dev,
654 ifap, 1);
655 break;
656 }
657 }
658 } else if (ifa->ifa_preferred_lft !=
659 INFINITY_LIFE_TIME &&
660 age >= ifa->ifa_preferred_lft &&
661 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
662 ifa->ifa_flags |= IFA_F_DEPRECATED;
663 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
664 }
665 }
666 rtnl_unlock();
667 }
668
669 next_sec = round_jiffies_up(next);
670 next_sched = next;
671
672
673 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
674 next_sched = next_sec;
675
676 now = jiffies;
677
678 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
679 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
680
681 schedule_delayed_work(&check_lifetime_work, next_sched - now);
682}
683
684static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
685 __u32 prefered_lft)
686{
687 unsigned long timeout;
688
689 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
690
691 timeout = addrconf_timeout_fixup(valid_lft, HZ);
692 if (addrconf_finite_timeout(timeout))
693 ifa->ifa_valid_lft = timeout;
694 else
695 ifa->ifa_flags |= IFA_F_PERMANENT;
696
697 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
698 if (addrconf_finite_timeout(timeout)) {
699 if (timeout == 0)
700 ifa->ifa_flags |= IFA_F_DEPRECATED;
701 ifa->ifa_preferred_lft = timeout;
702 }
703 ifa->ifa_tstamp = jiffies;
704 if (!ifa->ifa_cstamp)
705 ifa->ifa_cstamp = ifa->ifa_tstamp;
706}
707
708static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
709 __u32 *pvalid_lft, __u32 *pprefered_lft)
710{
711 struct nlattr *tb[IFA_MAX+1];
712 struct in_ifaddr *ifa;
713 struct ifaddrmsg *ifm;
714 struct net_device *dev;
715 struct in_device *in_dev;
716 int err;
717
718 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
719 if (err < 0)
720 goto errout;
721
722 ifm = nlmsg_data(nlh);
723 err = -EINVAL;
724 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
725 goto errout;
726
727 dev = __dev_get_by_index(net, ifm->ifa_index);
728 err = -ENODEV;
729 if (dev == NULL)
730 goto errout;
731
732 in_dev = __in_dev_get_rtnl(dev);
733 err = -ENOBUFS;
734 if (in_dev == NULL)
735 goto errout;
736
737 ifa = inet_alloc_ifa();
738 if (ifa == NULL)
739
740
741
742
743 goto errout;
744
745 ipv4_devconf_setall(in_dev);
746 in_dev_hold(in_dev);
747
748 if (tb[IFA_ADDRESS] == NULL)
749 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
750
751 INIT_HLIST_NODE(&ifa->hash);
752 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
753 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
754 ifa->ifa_flags = ifm->ifa_flags;
755 ifa->ifa_scope = ifm->ifa_scope;
756 ifa->ifa_dev = in_dev;
757
758 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
759 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
760
761 if (tb[IFA_BROADCAST])
762 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
763
764 if (tb[IFA_LABEL])
765 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
766 else
767 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
768
769 if (tb[IFA_CACHEINFO]) {
770 struct ifa_cacheinfo *ci;
771
772 ci = nla_data(tb[IFA_CACHEINFO]);
773 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
774 err = -EINVAL;
775 goto errout_free;
776 }
777 *pvalid_lft = ci->ifa_valid;
778 *pprefered_lft = ci->ifa_prefered;
779 }
780
781 return ifa;
782
783errout_free:
784 inet_free_ifa(ifa);
785errout:
786 return ERR_PTR(err);
787}
788
789static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
790{
791 struct in_device *in_dev = ifa->ifa_dev;
792 struct in_ifaddr *ifa1, **ifap;
793
794 if (!ifa->ifa_local)
795 return NULL;
796
797 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
798 ifap = &ifa1->ifa_next) {
799 if (ifa1->ifa_mask == ifa->ifa_mask &&
800 inet_ifa_match(ifa1->ifa_address, ifa) &&
801 ifa1->ifa_local == ifa->ifa_local)
802 return ifa1;
803 }
804 return NULL;
805}
806
807static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
808{
809 struct net *net = sock_net(skb->sk);
810 struct in_ifaddr *ifa;
811 struct in_ifaddr *ifa_existing;
812 __u32 valid_lft = INFINITY_LIFE_TIME;
813 __u32 prefered_lft = INFINITY_LIFE_TIME;
814
815 ASSERT_RTNL();
816
817 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
818 if (IS_ERR(ifa))
819 return PTR_ERR(ifa);
820
821 ifa_existing = find_matching_ifa(ifa);
822 if (!ifa_existing) {
823
824
825
826 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
827 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
828 } else {
829 inet_free_ifa(ifa);
830
831 if (nlh->nlmsg_flags & NLM_F_EXCL ||
832 !(nlh->nlmsg_flags & NLM_F_REPLACE))
833 return -EEXIST;
834 ifa = ifa_existing;
835 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
836 cancel_delayed_work(&check_lifetime_work);
837 schedule_delayed_work(&check_lifetime_work, 0);
838 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
839 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
840 }
841 return 0;
842}
843
844
845
846
847
848static int inet_abc_len(__be32 addr)
849{
850 int rc = -1;
851
852 if (ipv4_is_zeronet(addr))
853 rc = 0;
854 else {
855 __u32 haddr = ntohl(addr);
856
857 if (IN_CLASSA(haddr))
858 rc = 8;
859 else if (IN_CLASSB(haddr))
860 rc = 16;
861 else if (IN_CLASSC(haddr))
862 rc = 24;
863 }
864
865 return rc;
866}
867
868
869int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
870{
871 struct ifreq ifr;
872 struct sockaddr_in sin_orig;
873 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
874 struct in_device *in_dev;
875 struct in_ifaddr **ifap = NULL;
876 struct in_ifaddr *ifa = NULL;
877 struct net_device *dev;
878 char *colon;
879 int ret = -EFAULT;
880 int tryaddrmatch = 0;
881
882
883
884
885
886 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
887 goto out;
888 ifr.ifr_name[IFNAMSIZ - 1] = 0;
889
890
891 memcpy(&sin_orig, sin, sizeof(*sin));
892
893 colon = strchr(ifr.ifr_name, ':');
894 if (colon)
895 *colon = 0;
896
897 dev_load(net, ifr.ifr_name);
898
899 switch (cmd) {
900 case SIOCGIFADDR:
901 case SIOCGIFBRDADDR:
902 case SIOCGIFDSTADDR:
903 case SIOCGIFNETMASK:
904
905
906
907
908 tryaddrmatch = (sin_orig.sin_family == AF_INET);
909 memset(sin, 0, sizeof(*sin));
910 sin->sin_family = AF_INET;
911 break;
912
913 case SIOCSIFFLAGS:
914 ret = -EPERM;
915 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
916 goto out;
917 break;
918 case SIOCSIFADDR:
919 case SIOCSIFBRDADDR:
920 case SIOCSIFDSTADDR:
921 case SIOCSIFNETMASK:
922 ret = -EPERM;
923 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
924 goto out;
925 ret = -EINVAL;
926 if (sin->sin_family != AF_INET)
927 goto out;
928 break;
929 default:
930 ret = -EINVAL;
931 goto out;
932 }
933
934 rtnl_lock();
935
936 ret = -ENODEV;
937 dev = __dev_get_by_name(net, ifr.ifr_name);
938 if (!dev)
939 goto done;
940
941 if (colon)
942 *colon = ':';
943
944 in_dev = __in_dev_get_rtnl(dev);
945 if (in_dev) {
946 if (tryaddrmatch) {
947
948
949
950
951
952 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
953 ifap = &ifa->ifa_next) {
954 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
955 sin_orig.sin_addr.s_addr ==
956 ifa->ifa_local) {
957 break;
958 }
959 }
960 }
961
962
963
964 if (!ifa) {
965 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
966 ifap = &ifa->ifa_next)
967 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
968 break;
969 }
970 }
971
972 ret = -EADDRNOTAVAIL;
973 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
974 goto done;
975
976 switch (cmd) {
977 case SIOCGIFADDR:
978 sin->sin_addr.s_addr = ifa->ifa_local;
979 goto rarok;
980
981 case SIOCGIFBRDADDR:
982 sin->sin_addr.s_addr = ifa->ifa_broadcast;
983 goto rarok;
984
985 case SIOCGIFDSTADDR:
986 sin->sin_addr.s_addr = ifa->ifa_address;
987 goto rarok;
988
989 case SIOCGIFNETMASK:
990 sin->sin_addr.s_addr = ifa->ifa_mask;
991 goto rarok;
992
993 case SIOCSIFFLAGS:
994 if (colon) {
995 ret = -EADDRNOTAVAIL;
996 if (!ifa)
997 break;
998 ret = 0;
999 if (!(ifr.ifr_flags & IFF_UP))
1000 inet_del_ifa(in_dev, ifap, 1);
1001 break;
1002 }
1003 ret = dev_change_flags(dev, ifr.ifr_flags);
1004 break;
1005
1006 case SIOCSIFADDR:
1007 ret = -EINVAL;
1008 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1009 break;
1010
1011 if (!ifa) {
1012 ret = -ENOBUFS;
1013 ifa = inet_alloc_ifa();
1014 if (!ifa)
1015 break;
1016 INIT_HLIST_NODE(&ifa->hash);
1017 if (colon)
1018 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1019 else
1020 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1021 } else {
1022 ret = 0;
1023 if (ifa->ifa_local == sin->sin_addr.s_addr)
1024 break;
1025 inet_del_ifa(in_dev, ifap, 0);
1026 ifa->ifa_broadcast = 0;
1027 ifa->ifa_scope = 0;
1028 }
1029
1030 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1031
1032 if (!(dev->flags & IFF_POINTOPOINT)) {
1033 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1034 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1035 if ((dev->flags & IFF_BROADCAST) &&
1036 ifa->ifa_prefixlen < 31)
1037 ifa->ifa_broadcast = ifa->ifa_address |
1038 ~ifa->ifa_mask;
1039 } else {
1040 ifa->ifa_prefixlen = 32;
1041 ifa->ifa_mask = inet_make_mask(32);
1042 }
1043 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1044 ret = inet_set_ifa(dev, ifa);
1045 break;
1046
1047 case SIOCSIFBRDADDR:
1048 ret = 0;
1049 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1050 inet_del_ifa(in_dev, ifap, 0);
1051 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1052 inet_insert_ifa(ifa);
1053 }
1054 break;
1055
1056 case SIOCSIFDSTADDR:
1057 ret = 0;
1058 if (ifa->ifa_address == sin->sin_addr.s_addr)
1059 break;
1060 ret = -EINVAL;
1061 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1062 break;
1063 ret = 0;
1064 inet_del_ifa(in_dev, ifap, 0);
1065 ifa->ifa_address = sin->sin_addr.s_addr;
1066 inet_insert_ifa(ifa);
1067 break;
1068
1069 case SIOCSIFNETMASK:
1070
1071
1072
1073
1074 ret = -EINVAL;
1075 if (bad_mask(sin->sin_addr.s_addr, 0))
1076 break;
1077 ret = 0;
1078 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1079 __be32 old_mask = ifa->ifa_mask;
1080 inet_del_ifa(in_dev, ifap, 0);
1081 ifa->ifa_mask = sin->sin_addr.s_addr;
1082 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1083
1084
1085
1086
1087
1088
1089
1090 if ((dev->flags & IFF_BROADCAST) &&
1091 (ifa->ifa_prefixlen < 31) &&
1092 (ifa->ifa_broadcast ==
1093 (ifa->ifa_local|~old_mask))) {
1094 ifa->ifa_broadcast = (ifa->ifa_local |
1095 ~sin->sin_addr.s_addr);
1096 }
1097 inet_insert_ifa(ifa);
1098 }
1099 break;
1100 }
1101done:
1102 rtnl_unlock();
1103out:
1104 return ret;
1105rarok:
1106 rtnl_unlock();
1107 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1108 goto out;
1109}
1110
1111static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1112{
1113 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1114 struct in_ifaddr *ifa;
1115 struct ifreq ifr;
1116 int done = 0;
1117
1118 if (!in_dev)
1119 goto out;
1120
1121 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1122 if (!buf) {
1123 done += sizeof(ifr);
1124 continue;
1125 }
1126 if (len < (int) sizeof(ifr))
1127 break;
1128 memset(&ifr, 0, sizeof(struct ifreq));
1129 if (ifa->ifa_label)
1130 strcpy(ifr.ifr_name, ifa->ifa_label);
1131 else
1132 strcpy(ifr.ifr_name, dev->name);
1133
1134 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1135 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1136 ifa->ifa_local;
1137
1138 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1139 done = -EFAULT;
1140 break;
1141 }
1142 buf += sizeof(struct ifreq);
1143 len -= sizeof(struct ifreq);
1144 done += sizeof(struct ifreq);
1145 }
1146out:
1147 return done;
1148}
1149
1150__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1151{
1152 __be32 addr = 0;
1153 struct in_device *in_dev;
1154 struct net *net = dev_net(dev);
1155
1156 rcu_read_lock();
1157 in_dev = __in_dev_get_rcu(dev);
1158 if (!in_dev)
1159 goto no_in_dev;
1160
1161 for_primary_ifa(in_dev) {
1162 if (ifa->ifa_scope > scope)
1163 continue;
1164 if (!dst || inet_ifa_match(dst, ifa)) {
1165 addr = ifa->ifa_local;
1166 break;
1167 }
1168 if (!addr)
1169 addr = ifa->ifa_local;
1170 } endfor_ifa(in_dev);
1171
1172 if (addr)
1173 goto out_unlock;
1174no_in_dev:
1175
1176
1177
1178
1179
1180 for_each_netdev_rcu(net, dev) {
1181 in_dev = __in_dev_get_rcu(dev);
1182 if (!in_dev)
1183 continue;
1184
1185 for_primary_ifa(in_dev) {
1186 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1187 ifa->ifa_scope <= scope) {
1188 addr = ifa->ifa_local;
1189 goto out_unlock;
1190 }
1191 } endfor_ifa(in_dev);
1192 }
1193out_unlock:
1194 rcu_read_unlock();
1195 return addr;
1196}
1197EXPORT_SYMBOL(inet_select_addr);
1198
1199static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1200 __be32 local, int scope)
1201{
1202 int same = 0;
1203 __be32 addr = 0;
1204
1205 for_ifa(in_dev) {
1206 if (!addr &&
1207 (local == ifa->ifa_local || !local) &&
1208 ifa->ifa_scope <= scope) {
1209 addr = ifa->ifa_local;
1210 if (same)
1211 break;
1212 }
1213 if (!same) {
1214 same = (!local || inet_ifa_match(local, ifa)) &&
1215 (!dst || inet_ifa_match(dst, ifa));
1216 if (same && addr) {
1217 if (local || !dst)
1218 break;
1219
1220 if (inet_ifa_match(addr, ifa))
1221 break;
1222
1223 if (ifa->ifa_scope <= scope) {
1224 addr = ifa->ifa_local;
1225 break;
1226 }
1227
1228 same = 0;
1229 }
1230 }
1231 } endfor_ifa(in_dev);
1232
1233 return same ? addr : 0;
1234}
1235
1236
1237
1238
1239
1240
1241
1242
1243__be32 inet_confirm_addr(struct in_device *in_dev,
1244 __be32 dst, __be32 local, int scope)
1245{
1246 __be32 addr = 0;
1247 struct net_device *dev;
1248 struct net *net;
1249
1250 if (scope != RT_SCOPE_LINK)
1251 return confirm_addr_indev(in_dev, dst, local, scope);
1252
1253 net = dev_net(in_dev->dev);
1254 rcu_read_lock();
1255 for_each_netdev_rcu(net, dev) {
1256 in_dev = __in_dev_get_rcu(dev);
1257 if (in_dev) {
1258 addr = confirm_addr_indev(in_dev, dst, local, scope);
1259 if (addr)
1260 break;
1261 }
1262 }
1263 rcu_read_unlock();
1264
1265 return addr;
1266}
1267EXPORT_SYMBOL(inet_confirm_addr);
1268
1269
1270
1271
1272
1273int register_inetaddr_notifier(struct notifier_block *nb)
1274{
1275 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1276}
1277EXPORT_SYMBOL(register_inetaddr_notifier);
1278
1279int unregister_inetaddr_notifier(struct notifier_block *nb)
1280{
1281 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1282}
1283EXPORT_SYMBOL(unregister_inetaddr_notifier);
1284
1285
1286
1287
1288static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1289{
1290 struct in_ifaddr *ifa;
1291 int named = 0;
1292
1293 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1294 char old[IFNAMSIZ], *dot;
1295
1296 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1297 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1298 if (named++ == 0)
1299 goto skip;
1300 dot = strchr(old, ':');
1301 if (dot == NULL) {
1302 sprintf(old, ":%d", named);
1303 dot = old;
1304 }
1305 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1306 strcat(ifa->ifa_label, dot);
1307 else
1308 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1309skip:
1310 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1311 }
1312}
1313
1314static bool inetdev_valid_mtu(unsigned int mtu)
1315{
1316 return mtu >= 68;
1317}
1318
1319static void inetdev_send_gratuitous_arp(struct net_device *dev,
1320 struct in_device *in_dev)
1321
1322{
1323 struct in_ifaddr *ifa;
1324
1325 for (ifa = in_dev->ifa_list; ifa;
1326 ifa = ifa->ifa_next) {
1327 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1328 ifa->ifa_local, dev,
1329 ifa->ifa_local, NULL,
1330 dev->dev_addr, NULL);
1331 }
1332}
1333
1334
1335
1336static int inetdev_event(struct notifier_block *this, unsigned long event,
1337 void *ptr)
1338{
1339 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1340 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1341
1342 ASSERT_RTNL();
1343
1344 if (!in_dev) {
1345 if (event == NETDEV_REGISTER) {
1346 in_dev = inetdev_init(dev);
1347 if (!in_dev)
1348 return notifier_from_errno(-ENOMEM);
1349 if (dev->flags & IFF_LOOPBACK) {
1350 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1351 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1352 }
1353 } else if (event == NETDEV_CHANGEMTU) {
1354
1355 if (inetdev_valid_mtu(dev->mtu))
1356 in_dev = inetdev_init(dev);
1357 }
1358 goto out;
1359 }
1360
1361 switch (event) {
1362 case NETDEV_REGISTER:
1363 pr_debug("%s: bug\n", __func__);
1364 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1365 break;
1366 case NETDEV_UP:
1367 if (!inetdev_valid_mtu(dev->mtu))
1368 break;
1369 if (dev->flags & IFF_LOOPBACK) {
1370 struct in_ifaddr *ifa = inet_alloc_ifa();
1371
1372 if (ifa) {
1373 INIT_HLIST_NODE(&ifa->hash);
1374 ifa->ifa_local =
1375 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1376 ifa->ifa_prefixlen = 8;
1377 ifa->ifa_mask = inet_make_mask(8);
1378 in_dev_hold(in_dev);
1379 ifa->ifa_dev = in_dev;
1380 ifa->ifa_scope = RT_SCOPE_HOST;
1381 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1382 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1383 INFINITY_LIFE_TIME);
1384 inet_insert_ifa(ifa);
1385 }
1386 }
1387 ip_mc_up(in_dev);
1388
1389 case NETDEV_CHANGEADDR:
1390 if (!IN_DEV_ARP_NOTIFY(in_dev))
1391 break;
1392
1393 case NETDEV_NOTIFY_PEERS:
1394
1395 inetdev_send_gratuitous_arp(dev, in_dev);
1396 break;
1397 case NETDEV_DOWN:
1398 ip_mc_down(in_dev);
1399 break;
1400 case NETDEV_PRE_TYPE_CHANGE:
1401 ip_mc_unmap(in_dev);
1402 break;
1403 case NETDEV_POST_TYPE_CHANGE:
1404 ip_mc_remap(in_dev);
1405 break;
1406 case NETDEV_CHANGEMTU:
1407 if (inetdev_valid_mtu(dev->mtu))
1408 break;
1409
1410 case NETDEV_UNREGISTER:
1411 inetdev_destroy(in_dev);
1412 break;
1413 case NETDEV_CHANGENAME:
1414
1415
1416
1417 inetdev_changename(dev, in_dev);
1418
1419 devinet_sysctl_unregister(in_dev);
1420 devinet_sysctl_register(in_dev);
1421 break;
1422 }
1423out:
1424 return NOTIFY_DONE;
1425}
1426
1427static struct notifier_block ip_netdev_notifier = {
1428 .notifier_call = inetdev_event,
1429};
1430
1431static size_t inet_nlmsg_size(void)
1432{
1433 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1434 + nla_total_size(4)
1435 + nla_total_size(4)
1436 + nla_total_size(4)
1437 + nla_total_size(IFNAMSIZ);
1438}
1439
1440static inline u32 cstamp_delta(unsigned long cstamp)
1441{
1442 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1443}
1444
1445static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1446 unsigned long tstamp, u32 preferred, u32 valid)
1447{
1448 struct ifa_cacheinfo ci;
1449
1450 ci.cstamp = cstamp_delta(cstamp);
1451 ci.tstamp = cstamp_delta(tstamp);
1452 ci.ifa_prefered = preferred;
1453 ci.ifa_valid = valid;
1454
1455 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1456}
1457
1458static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1459 u32 portid, u32 seq, int event, unsigned int flags)
1460{
1461 struct ifaddrmsg *ifm;
1462 struct nlmsghdr *nlh;
1463 u32 preferred, valid;
1464
1465 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
1466 if (nlh == NULL)
1467 return -EMSGSIZE;
1468
1469 ifm = nlmsg_data(nlh);
1470 ifm->ifa_family = AF_INET;
1471 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1472 ifm->ifa_flags = ifa->ifa_flags;
1473 ifm->ifa_scope = ifa->ifa_scope;
1474 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1475
1476 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1477 preferred = ifa->ifa_preferred_lft;
1478 valid = ifa->ifa_valid_lft;
1479 if (preferred != INFINITY_LIFE_TIME) {
1480 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1481
1482 if (preferred > tval)
1483 preferred -= tval;
1484 else
1485 preferred = 0;
1486 if (valid != INFINITY_LIFE_TIME) {
1487 if (valid > tval)
1488 valid -= tval;
1489 else
1490 valid = 0;
1491 }
1492 }
1493 } else {
1494 preferred = INFINITY_LIFE_TIME;
1495 valid = INFINITY_LIFE_TIME;
1496 }
1497 if ((ifa->ifa_address &&
1498 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1499 (ifa->ifa_local &&
1500 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1501 (ifa->ifa_broadcast &&
1502 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1503 (ifa->ifa_label[0] &&
1504 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1505 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1506 preferred, valid))
1507 goto nla_put_failure;
1508
1509 return nlmsg_end(skb, nlh);
1510
1511nla_put_failure:
1512 nlmsg_cancel(skb, nlh);
1513 return -EMSGSIZE;
1514}
1515
1516static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1517{
1518 struct net *net = sock_net(skb->sk);
1519 int h, s_h;
1520 int idx, s_idx;
1521 int ip_idx, s_ip_idx;
1522 struct net_device *dev;
1523 struct in_device *in_dev;
1524 struct in_ifaddr *ifa;
1525 struct hlist_head *head;
1526
1527 s_h = cb->args[0];
1528 s_idx = idx = cb->args[1];
1529 s_ip_idx = ip_idx = cb->args[2];
1530
1531 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1532 idx = 0;
1533 head = &net->dev_index_head[h];
1534 rcu_read_lock();
1535 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1536 net->dev_base_seq;
1537 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1538 if (idx < s_idx)
1539 goto cont;
1540 if (h > s_h || idx > s_idx)
1541 s_ip_idx = 0;
1542 in_dev = __in_dev_get_rcu(dev);
1543 if (!in_dev)
1544 goto cont;
1545
1546 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1547 ifa = ifa->ifa_next, ip_idx++) {
1548 if (ip_idx < s_ip_idx)
1549 continue;
1550 if (inet_fill_ifaddr(skb, ifa,
1551 NETLINK_CB(cb->skb).portid,
1552 cb->nlh->nlmsg_seq,
1553 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1554 rcu_read_unlock();
1555 goto done;
1556 }
1557 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1558 }
1559cont:
1560 idx++;
1561 }
1562 rcu_read_unlock();
1563 }
1564
1565done:
1566 cb->args[0] = h;
1567 cb->args[1] = idx;
1568 cb->args[2] = ip_idx;
1569
1570 return skb->len;
1571}
1572
1573static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1574 u32 portid)
1575{
1576 struct sk_buff *skb;
1577 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1578 int err = -ENOBUFS;
1579 struct net *net;
1580
1581 net = dev_net(ifa->ifa_dev->dev);
1582 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1583 if (skb == NULL)
1584 goto errout;
1585
1586 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
1587 if (err < 0) {
1588
1589 WARN_ON(err == -EMSGSIZE);
1590 kfree_skb(skb);
1591 goto errout;
1592 }
1593 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1594 return;
1595errout:
1596 if (err < 0)
1597 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1598}
1599
1600static size_t inet_get_link_af_size(const struct net_device *dev)
1601{
1602 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1603
1604 if (!in_dev)
1605 return 0;
1606
1607 return nla_total_size(IPV4_DEVCONF_MAX * 4);
1608}
1609
1610static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1611{
1612 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1613 struct nlattr *nla;
1614 int i;
1615
1616 if (!in_dev)
1617 return -ENODATA;
1618
1619 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1620 if (nla == NULL)
1621 return -EMSGSIZE;
1622
1623 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1624 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1625
1626 return 0;
1627}
1628
1629static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1630 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1631};
1632
1633static int inet_validate_link_af(const struct net_device *dev,
1634 const struct nlattr *nla)
1635{
1636 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1637 int err, rem;
1638
1639 if (dev && !__in_dev_get_rtnl(dev))
1640 return -EAFNOSUPPORT;
1641
1642 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1643 if (err < 0)
1644 return err;
1645
1646 if (tb[IFLA_INET_CONF]) {
1647 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1648 int cfgid = nla_type(a);
1649
1650 if (nla_len(a) < 4)
1651 return -EINVAL;
1652
1653 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1654 return -EINVAL;
1655 }
1656 }
1657
1658 return 0;
1659}
1660
1661static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1662{
1663 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1664 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1665 int rem;
1666
1667 if (!in_dev)
1668 return -EAFNOSUPPORT;
1669
1670 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1671 BUG();
1672
1673 if (tb[IFLA_INET_CONF]) {
1674 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1675 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1676 }
1677
1678 return 0;
1679}
1680
1681static int inet_netconf_msgsize_devconf(int type)
1682{
1683 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1684 + nla_total_size(4);
1685
1686
1687 if (type == -1 || type == NETCONFA_FORWARDING)
1688 size += nla_total_size(4);
1689 if (type == -1 || type == NETCONFA_RP_FILTER)
1690 size += nla_total_size(4);
1691 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1692 size += nla_total_size(4);
1693
1694 return size;
1695}
1696
1697static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1698 struct ipv4_devconf *devconf, u32 portid,
1699 u32 seq, int event, unsigned int flags,
1700 int type)
1701{
1702 struct nlmsghdr *nlh;
1703 struct netconfmsg *ncm;
1704
1705 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1706 flags);
1707 if (nlh == NULL)
1708 return -EMSGSIZE;
1709
1710 ncm = nlmsg_data(nlh);
1711 ncm->ncm_family = AF_INET;
1712
1713 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1714 goto nla_put_failure;
1715
1716
1717 if ((type == -1 || type == NETCONFA_FORWARDING) &&
1718 nla_put_s32(skb, NETCONFA_FORWARDING,
1719 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1720 goto nla_put_failure;
1721 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1722 nla_put_s32(skb, NETCONFA_RP_FILTER,
1723 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1724 goto nla_put_failure;
1725 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1726 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1727 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1728 goto nla_put_failure;
1729
1730 return nlmsg_end(skb, nlh);
1731
1732nla_put_failure:
1733 nlmsg_cancel(skb, nlh);
1734 return -EMSGSIZE;
1735}
1736
1737void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1738 struct ipv4_devconf *devconf)
1739{
1740 struct sk_buff *skb;
1741 int err = -ENOBUFS;
1742
1743 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1744 if (skb == NULL)
1745 goto errout;
1746
1747 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1748 RTM_NEWNETCONF, 0, type);
1749 if (err < 0) {
1750
1751 WARN_ON(err == -EMSGSIZE);
1752 kfree_skb(skb);
1753 goto errout;
1754 }
1755 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1756 return;
1757errout:
1758 if (err < 0)
1759 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1760}
1761
1762static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1763 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1764 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
1765 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
1766};
1767
1768static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1769 struct nlmsghdr *nlh)
1770{
1771 struct net *net = sock_net(in_skb->sk);
1772 struct nlattr *tb[NETCONFA_MAX+1];
1773 struct netconfmsg *ncm;
1774 struct sk_buff *skb;
1775 struct ipv4_devconf *devconf;
1776 struct in_device *in_dev;
1777 struct net_device *dev;
1778 int ifindex;
1779 int err;
1780
1781 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1782 devconf_ipv4_policy);
1783 if (err < 0)
1784 goto errout;
1785
1786 err = EINVAL;
1787 if (!tb[NETCONFA_IFINDEX])
1788 goto errout;
1789
1790 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1791 switch (ifindex) {
1792 case NETCONFA_IFINDEX_ALL:
1793 devconf = net->ipv4.devconf_all;
1794 break;
1795 case NETCONFA_IFINDEX_DEFAULT:
1796 devconf = net->ipv4.devconf_dflt;
1797 break;
1798 default:
1799 dev = __dev_get_by_index(net, ifindex);
1800 if (dev == NULL)
1801 goto errout;
1802 in_dev = __in_dev_get_rtnl(dev);
1803 if (in_dev == NULL)
1804 goto errout;
1805 devconf = &in_dev->cnf;
1806 break;
1807 }
1808
1809 err = -ENOBUFS;
1810 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1811 if (skb == NULL)
1812 goto errout;
1813
1814 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1815 NETLINK_CB(in_skb).portid,
1816 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1817 -1);
1818 if (err < 0) {
1819
1820 WARN_ON(err == -EMSGSIZE);
1821 kfree_skb(skb);
1822 goto errout;
1823 }
1824 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1825errout:
1826 return err;
1827}
1828
1829static int inet_netconf_dump_devconf(struct sk_buff *skb,
1830 struct netlink_callback *cb)
1831{
1832 struct net *net = sock_net(skb->sk);
1833 int h, s_h;
1834 int idx, s_idx;
1835 struct net_device *dev;
1836 struct in_device *in_dev;
1837 struct hlist_head *head;
1838
1839 s_h = cb->args[0];
1840 s_idx = idx = cb->args[1];
1841
1842 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1843 idx = 0;
1844 head = &net->dev_index_head[h];
1845 rcu_read_lock();
1846 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1847 net->dev_base_seq;
1848 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1849 if (idx < s_idx)
1850 goto cont;
1851 in_dev = __in_dev_get_rcu(dev);
1852 if (!in_dev)
1853 goto cont;
1854
1855 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1856 &in_dev->cnf,
1857 NETLINK_CB(cb->skb).portid,
1858 cb->nlh->nlmsg_seq,
1859 RTM_NEWNETCONF,
1860 NLM_F_MULTI,
1861 -1) <= 0) {
1862 rcu_read_unlock();
1863 goto done;
1864 }
1865 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1866cont:
1867 idx++;
1868 }
1869 rcu_read_unlock();
1870 }
1871 if (h == NETDEV_HASHENTRIES) {
1872 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1873 net->ipv4.devconf_all,
1874 NETLINK_CB(cb->skb).portid,
1875 cb->nlh->nlmsg_seq,
1876 RTM_NEWNETCONF, NLM_F_MULTI,
1877 -1) <= 0)
1878 goto done;
1879 else
1880 h++;
1881 }
1882 if (h == NETDEV_HASHENTRIES + 1) {
1883 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1884 net->ipv4.devconf_dflt,
1885 NETLINK_CB(cb->skb).portid,
1886 cb->nlh->nlmsg_seq,
1887 RTM_NEWNETCONF, NLM_F_MULTI,
1888 -1) <= 0)
1889 goto done;
1890 else
1891 h++;
1892 }
1893done:
1894 cb->args[0] = h;
1895 cb->args[1] = idx;
1896
1897 return skb->len;
1898}
1899
1900#ifdef CONFIG_SYSCTL
1901
1902static void devinet_copy_dflt_conf(struct net *net, int i)
1903{
1904 struct net_device *dev;
1905
1906 rcu_read_lock();
1907 for_each_netdev_rcu(net, dev) {
1908 struct in_device *in_dev;
1909
1910 in_dev = __in_dev_get_rcu(dev);
1911 if (in_dev && !test_bit(i, in_dev->cnf.state))
1912 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1913 }
1914 rcu_read_unlock();
1915}
1916
1917
1918static void inet_forward_change(struct net *net)
1919{
1920 struct net_device *dev;
1921 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1922
1923 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1924 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1925 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1926 NETCONFA_IFINDEX_ALL,
1927 net->ipv4.devconf_all);
1928 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1929 NETCONFA_IFINDEX_DEFAULT,
1930 net->ipv4.devconf_dflt);
1931
1932 for_each_netdev(net, dev) {
1933 struct in_device *in_dev;
1934 if (on)
1935 dev_disable_lro(dev);
1936 rcu_read_lock();
1937 in_dev = __in_dev_get_rcu(dev);
1938 if (in_dev) {
1939 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1940 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1941 dev->ifindex, &in_dev->cnf);
1942 }
1943 rcu_read_unlock();
1944 }
1945}
1946
1947static int devinet_conf_proc(struct ctl_table *ctl, int write,
1948 void __user *buffer,
1949 size_t *lenp, loff_t *ppos)
1950{
1951 int old_value = *(int *)ctl->data;
1952 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1953 int new_value = *(int *)ctl->data;
1954
1955 if (write) {
1956 struct ipv4_devconf *cnf = ctl->extra1;
1957 struct net *net = ctl->extra2;
1958 int i = (int *)ctl->data - cnf->data;
1959
1960 set_bit(i, cnf->state);
1961
1962 if (cnf == net->ipv4.devconf_dflt)
1963 devinet_copy_dflt_conf(net, i);
1964 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
1965 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
1966 if ((new_value == 0) && (old_value != 0))
1967 rt_cache_flush(net);
1968 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
1969 new_value != old_value) {
1970 int ifindex;
1971
1972 if (cnf == net->ipv4.devconf_dflt)
1973 ifindex = NETCONFA_IFINDEX_DEFAULT;
1974 else if (cnf == net->ipv4.devconf_all)
1975 ifindex = NETCONFA_IFINDEX_ALL;
1976 else {
1977 struct in_device *idev =
1978 container_of(cnf, struct in_device,
1979 cnf);
1980 ifindex = idev->dev->ifindex;
1981 }
1982 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
1983 ifindex, cnf);
1984 }
1985 }
1986
1987 return ret;
1988}
1989
1990static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
1991 void __user *buffer,
1992 size_t *lenp, loff_t *ppos)
1993{
1994 int *valp = ctl->data;
1995 int val = *valp;
1996 loff_t pos = *ppos;
1997 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1998
1999 if (write && *valp != val) {
2000 struct net *net = ctl->extra2;
2001
2002 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2003 if (!rtnl_trylock()) {
2004
2005 *valp = val;
2006 *ppos = pos;
2007 return restart_syscall();
2008 }
2009 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2010 inet_forward_change(net);
2011 } else {
2012 struct ipv4_devconf *cnf = ctl->extra1;
2013 struct in_device *idev =
2014 container_of(cnf, struct in_device, cnf);
2015 if (*valp)
2016 dev_disable_lro(idev->dev);
2017 inet_netconf_notify_devconf(net,
2018 NETCONFA_FORWARDING,
2019 idev->dev->ifindex,
2020 cnf);
2021 }
2022 rtnl_unlock();
2023 rt_cache_flush(net);
2024 } else
2025 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2026 NETCONFA_IFINDEX_DEFAULT,
2027 net->ipv4.devconf_dflt);
2028 }
2029
2030 return ret;
2031}
2032
2033static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2034 void __user *buffer,
2035 size_t *lenp, loff_t *ppos)
2036{
2037 int *valp = ctl->data;
2038 int val = *valp;
2039 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2040 struct net *net = ctl->extra2;
2041
2042 if (write && *valp != val)
2043 rt_cache_flush(net);
2044
2045 return ret;
2046}
2047
2048#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2049 { \
2050 .procname = name, \
2051 .data = ipv4_devconf.data + \
2052 IPV4_DEVCONF_ ## attr - 1, \
2053 .maxlen = sizeof(int), \
2054 .mode = mval, \
2055 .proc_handler = proc, \
2056 .extra1 = &ipv4_devconf, \
2057 }
2058
2059#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2060 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2061
2062#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2063 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2064
2065#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2066 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2067
2068#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2069 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2070
2071static struct devinet_sysctl_table {
2072 struct ctl_table_header *sysctl_header;
2073 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2074} devinet_sysctl = {
2075 .devinet_vars = {
2076 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2077 devinet_sysctl_forward),
2078 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2079
2080 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2081 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2082 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2083 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2084 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2085 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2086 "accept_source_route"),
2087 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2088 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2089 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2090 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2091 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2092 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2093 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2094 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2095 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2096 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2097 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2098 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2099 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2100
2101 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2102 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2103 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
2104 "force_igmp_version"),
2105 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2106 "promote_secondaries"),
2107 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2108 "route_localnet"),
2109 },
2110};
2111
2112static int __devinet_sysctl_register(struct net *net, char *dev_name,
2113 struct ipv4_devconf *p)
2114{
2115 int i;
2116 struct devinet_sysctl_table *t;
2117 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2118
2119 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2120 if (!t)
2121 goto out;
2122
2123 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2124 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2125 t->devinet_vars[i].extra1 = p;
2126 t->devinet_vars[i].extra2 = net;
2127 }
2128
2129 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2130
2131 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2132 if (!t->sysctl_header)
2133 goto free;
2134
2135 p->sysctl = t;
2136 return 0;
2137
2138free:
2139 kfree(t);
2140out:
2141 return -ENOBUFS;
2142}
2143
2144static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2145{
2146 struct devinet_sysctl_table *t = cnf->sysctl;
2147
2148 if (t == NULL)
2149 return;
2150
2151 cnf->sysctl = NULL;
2152 unregister_net_sysctl_table(t->sysctl_header);
2153 kfree(t);
2154}
2155
2156static void devinet_sysctl_register(struct in_device *idev)
2157{
2158 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
2159 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2160 &idev->cnf);
2161}
2162
2163static void devinet_sysctl_unregister(struct in_device *idev)
2164{
2165 __devinet_sysctl_unregister(&idev->cnf);
2166 neigh_sysctl_unregister(idev->arp_parms);
2167}
2168
2169static struct ctl_table ctl_forward_entry[] = {
2170 {
2171 .procname = "ip_forward",
2172 .data = &ipv4_devconf.data[
2173 IPV4_DEVCONF_FORWARDING - 1],
2174 .maxlen = sizeof(int),
2175 .mode = 0644,
2176 .proc_handler = devinet_sysctl_forward,
2177 .extra1 = &ipv4_devconf,
2178 .extra2 = &init_net,
2179 },
2180 { },
2181};
2182#endif
2183
2184static __net_init int devinet_init_net(struct net *net)
2185{
2186 int err;
2187 struct ipv4_devconf *all, *dflt;
2188#ifdef CONFIG_SYSCTL
2189 struct ctl_table *tbl = ctl_forward_entry;
2190 struct ctl_table_header *forw_hdr;
2191#endif
2192
2193 err = -ENOMEM;
2194 all = &ipv4_devconf;
2195 dflt = &ipv4_devconf_dflt;
2196
2197 if (!net_eq(net, &init_net)) {
2198 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2199 if (all == NULL)
2200 goto err_alloc_all;
2201
2202 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2203 if (dflt == NULL)
2204 goto err_alloc_dflt;
2205
2206#ifdef CONFIG_SYSCTL
2207 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2208 if (tbl == NULL)
2209 goto err_alloc_ctl;
2210
2211 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2212 tbl[0].extra1 = all;
2213 tbl[0].extra2 = net;
2214#endif
2215 }
2216
2217#ifdef CONFIG_SYSCTL
2218 err = __devinet_sysctl_register(net, "all", all);
2219 if (err < 0)
2220 goto err_reg_all;
2221
2222 err = __devinet_sysctl_register(net, "default", dflt);
2223 if (err < 0)
2224 goto err_reg_dflt;
2225
2226 err = -ENOMEM;
2227 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2228 if (forw_hdr == NULL)
2229 goto err_reg_ctl;
2230 net->ipv4.forw_hdr = forw_hdr;
2231#endif
2232
2233 net->ipv4.devconf_all = all;
2234 net->ipv4.devconf_dflt = dflt;
2235 return 0;
2236
2237#ifdef CONFIG_SYSCTL
2238err_reg_ctl:
2239 __devinet_sysctl_unregister(dflt);
2240err_reg_dflt:
2241 __devinet_sysctl_unregister(all);
2242err_reg_all:
2243 if (tbl != ctl_forward_entry)
2244 kfree(tbl);
2245err_alloc_ctl:
2246#endif
2247 if (dflt != &ipv4_devconf_dflt)
2248 kfree(dflt);
2249err_alloc_dflt:
2250 if (all != &ipv4_devconf)
2251 kfree(all);
2252err_alloc_all:
2253 return err;
2254}
2255
2256static __net_exit void devinet_exit_net(struct net *net)
2257{
2258#ifdef CONFIG_SYSCTL
2259 struct ctl_table *tbl;
2260
2261 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2262 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2263 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2264 __devinet_sysctl_unregister(net->ipv4.devconf_all);
2265 kfree(tbl);
2266#endif
2267 kfree(net->ipv4.devconf_dflt);
2268 kfree(net->ipv4.devconf_all);
2269}
2270
2271static __net_initdata struct pernet_operations devinet_ops = {
2272 .init = devinet_init_net,
2273 .exit = devinet_exit_net,
2274};
2275
2276static struct rtnl_af_ops inet_af_ops = {
2277 .family = AF_INET,
2278 .fill_link_af = inet_fill_link_af,
2279 .get_link_af_size = inet_get_link_af_size,
2280 .validate_link_af = inet_validate_link_af,
2281 .set_link_af = inet_set_link_af,
2282};
2283
2284void __init devinet_init(void)
2285{
2286 int i;
2287
2288 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2289 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2290
2291 register_pernet_subsys(&devinet_ops);
2292
2293 register_gifconf(PF_INET, inet_gifconf);
2294 register_netdevice_notifier(&ip_netdev_notifier);
2295
2296 schedule_delayed_work(&check_lifetime_work, 0);
2297
2298 rtnl_af_register(&inet_af_ops);
2299
2300 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2301 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2302 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
2303 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2304 inet_netconf_dump_devconf, NULL);
2305}
2306
2307
