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29#include <asm/uaccess.h>
30#include <asm/system.h>
31#include <linux/bitops.h>
32#include <linux/capability.h>
33#include <linux/module.h>
34#include <linux/types.h>
35#include <linux/kernel.h>
36#include <linux/string.h>
37#include <linux/mm.h>
38#include <linux/socket.h>
39#include <linux/sockios.h>
40#include <linux/in.h>
41#include <linux/errno.h>
42#include <linux/interrupt.h>
43#include <linux/if_addr.h>
44#include <linux/if_ether.h>
45#include <linux/inet.h>
46#include <linux/netdevice.h>
47#include <linux/etherdevice.h>
48#include <linux/skbuff.h>
49#include <linux/init.h>
50#include <linux/notifier.h>
51#include <linux/inetdevice.h>
52#include <linux/igmp.h>
53#ifdef CONFIG_SYSCTL
54#include <linux/sysctl.h>
55#endif
56#include <linux/kmod.h>
57
58#include <net/arp.h>
59#include <net/ip.h>
60#include <net/route.h>
61#include <net/ip_fib.h>
62#include <net/rtnetlink.h>
63#include <net/net_namespace.h>
64
65static struct ipv4_devconf ipv4_devconf = {
66 .data = {
67 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
68 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
69 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
70 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
71 },
72};
73
74static struct ipv4_devconf ipv4_devconf_dflt = {
75 .data = {
76 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
77 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
78 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
79 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
80 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
81 },
82};
83
84#define IPV4_DEVCONF_DFLT(net, attr) \
85 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
86
87static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
88 [IFA_LOCAL] = { .type = NLA_U32 },
89 [IFA_ADDRESS] = { .type = NLA_U32 },
90 [IFA_BROADCAST] = { .type = NLA_U32 },
91 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
92};
93
94static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
95
96static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
97static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
98 int destroy);
99#ifdef CONFIG_SYSCTL
100static void devinet_sysctl_register(struct in_device *idev);
101static void devinet_sysctl_unregister(struct in_device *idev);
102#else
103static inline void devinet_sysctl_register(struct in_device *idev)
104{
105}
106static inline void devinet_sysctl_unregister(struct in_device *idev)
107{
108}
109#endif
110
111
112
113static struct in_ifaddr *inet_alloc_ifa(void)
114{
115 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
116}
117
118static void inet_rcu_free_ifa(struct rcu_head *head)
119{
120 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
121 if (ifa->ifa_dev)
122 in_dev_put(ifa->ifa_dev);
123 kfree(ifa);
124}
125
126static inline void inet_free_ifa(struct in_ifaddr *ifa)
127{
128 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
129}
130
131void in_dev_finish_destroy(struct in_device *idev)
132{
133 struct net_device *dev = idev->dev;
134
135 WARN_ON(idev->ifa_list);
136 WARN_ON(idev->mc_list);
137#ifdef NET_REFCNT_DEBUG
138 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
139 idev, dev ? dev->name : "NIL");
140#endif
141 dev_put(dev);
142 if (!idev->dead)
143 pr_err("Freeing alive in_device %p\n", idev);
144 else
145 kfree(idev);
146}
147EXPORT_SYMBOL(in_dev_finish_destroy);
148
149static struct in_device *inetdev_init(struct net_device *dev)
150{
151 struct in_device *in_dev;
152
153 ASSERT_RTNL();
154
155 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
156 if (!in_dev)
157 goto out;
158 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
159 sizeof(in_dev->cnf));
160 in_dev->cnf.sysctl = NULL;
161 in_dev->dev = dev;
162 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
163 if (!in_dev->arp_parms)
164 goto out_kfree;
165 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
166 dev_disable_lro(dev);
167
168 dev_hold(dev);
169
170 in_dev_hold(in_dev);
171
172 devinet_sysctl_register(in_dev);
173 ip_mc_init_dev(in_dev);
174 if (dev->flags & IFF_UP)
175 ip_mc_up(in_dev);
176
177
178 rcu_assign_pointer(dev->ip_ptr, in_dev);
179out:
180 return in_dev;
181out_kfree:
182 kfree(in_dev);
183 in_dev = NULL;
184 goto out;
185}
186
187static void in_dev_rcu_put(struct rcu_head *head)
188{
189 struct in_device *idev = container_of(head, struct in_device, rcu_head);
190 in_dev_put(idev);
191}
192
193static void inetdev_destroy(struct in_device *in_dev)
194{
195 struct in_ifaddr *ifa;
196 struct net_device *dev;
197
198 ASSERT_RTNL();
199
200 dev = in_dev->dev;
201
202 in_dev->dead = 1;
203
204 ip_mc_destroy_dev(in_dev);
205
206 while ((ifa = in_dev->ifa_list) != NULL) {
207 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
208 inet_free_ifa(ifa);
209 }
210
211 dev->ip_ptr = NULL;
212
213 devinet_sysctl_unregister(in_dev);
214 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
215 arp_ifdown(dev);
216
217 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
218}
219
220int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
221{
222 rcu_read_lock();
223 for_primary_ifa(in_dev) {
224 if (inet_ifa_match(a, ifa)) {
225 if (!b || inet_ifa_match(b, ifa)) {
226 rcu_read_unlock();
227 return 1;
228 }
229 }
230 } endfor_ifa(in_dev);
231 rcu_read_unlock();
232 return 0;
233}
234
235static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
236 int destroy, struct nlmsghdr *nlh, u32 pid)
237{
238 struct in_ifaddr *promote = NULL;
239 struct in_ifaddr *ifa, *ifa1 = *ifap;
240 struct in_ifaddr *last_prim = in_dev->ifa_list;
241 struct in_ifaddr *prev_prom = NULL;
242 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
243
244 ASSERT_RTNL();
245
246
247
248
249
250 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
251 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
252
253 while ((ifa = *ifap1) != NULL) {
254 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
255 ifa1->ifa_scope <= ifa->ifa_scope)
256 last_prim = ifa;
257
258 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
259 ifa1->ifa_mask != ifa->ifa_mask ||
260 !inet_ifa_match(ifa1->ifa_address, ifa)) {
261 ifap1 = &ifa->ifa_next;
262 prev_prom = ifa;
263 continue;
264 }
265
266 if (!do_promote) {
267 *ifap1 = ifa->ifa_next;
268
269 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
270 blocking_notifier_call_chain(&inetaddr_chain,
271 NETDEV_DOWN, ifa);
272 inet_free_ifa(ifa);
273 } else {
274 promote = ifa;
275 break;
276 }
277 }
278 }
279
280
281
282 *ifap = ifa1->ifa_next;
283
284
285
286
287
288
289
290
291
292
293
294 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
295 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
296
297 if (promote) {
298
299 if (prev_prom) {
300 prev_prom->ifa_next = promote->ifa_next;
301 promote->ifa_next = last_prim->ifa_next;
302 last_prim->ifa_next = promote;
303 }
304
305 promote->ifa_flags &= ~IFA_F_SECONDARY;
306 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
307 blocking_notifier_call_chain(&inetaddr_chain,
308 NETDEV_UP, promote);
309 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
310 if (ifa1->ifa_mask != ifa->ifa_mask ||
311 !inet_ifa_match(ifa1->ifa_address, ifa))
312 continue;
313 fib_add_ifaddr(ifa);
314 }
315
316 }
317 if (destroy)
318 inet_free_ifa(ifa1);
319}
320
321static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
322 int destroy)
323{
324 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
325}
326
327static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
328 u32 pid)
329{
330 struct in_device *in_dev = ifa->ifa_dev;
331 struct in_ifaddr *ifa1, **ifap, **last_primary;
332
333 ASSERT_RTNL();
334
335 if (!ifa->ifa_local) {
336 inet_free_ifa(ifa);
337 return 0;
338 }
339
340 ifa->ifa_flags &= ~IFA_F_SECONDARY;
341 last_primary = &in_dev->ifa_list;
342
343 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
344 ifap = &ifa1->ifa_next) {
345 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
346 ifa->ifa_scope <= ifa1->ifa_scope)
347 last_primary = &ifa1->ifa_next;
348 if (ifa1->ifa_mask == ifa->ifa_mask &&
349 inet_ifa_match(ifa1->ifa_address, ifa)) {
350 if (ifa1->ifa_local == ifa->ifa_local) {
351 inet_free_ifa(ifa);
352 return -EEXIST;
353 }
354 if (ifa1->ifa_scope != ifa->ifa_scope) {
355 inet_free_ifa(ifa);
356 return -EINVAL;
357 }
358 ifa->ifa_flags |= IFA_F_SECONDARY;
359 }
360 }
361
362 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
363 net_srandom(ifa->ifa_local);
364 ifap = last_primary;
365 }
366
367 ifa->ifa_next = *ifap;
368 *ifap = ifa;
369
370
371
372
373 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
374 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
375
376 return 0;
377}
378
379static int inet_insert_ifa(struct in_ifaddr *ifa)
380{
381 return __inet_insert_ifa(ifa, NULL, 0);
382}
383
384static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
385{
386 struct in_device *in_dev = __in_dev_get_rtnl(dev);
387
388 ASSERT_RTNL();
389
390 if (!in_dev) {
391 inet_free_ifa(ifa);
392 return -ENOBUFS;
393 }
394 ipv4_devconf_setall(in_dev);
395 if (ifa->ifa_dev != in_dev) {
396 WARN_ON(ifa->ifa_dev);
397 in_dev_hold(in_dev);
398 ifa->ifa_dev = in_dev;
399 }
400 if (ipv4_is_loopback(ifa->ifa_local))
401 ifa->ifa_scope = RT_SCOPE_HOST;
402 return inet_insert_ifa(ifa);
403}
404
405struct in_device *inetdev_by_index(struct net *net, int ifindex)
406{
407 struct net_device *dev;
408 struct in_device *in_dev = NULL;
409
410 rcu_read_lock();
411 dev = dev_get_by_index_rcu(net, ifindex);
412 if (dev)
413 in_dev = in_dev_get(dev);
414 rcu_read_unlock();
415 return in_dev;
416}
417EXPORT_SYMBOL(inetdev_by_index);
418
419
420
421struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
422 __be32 mask)
423{
424 ASSERT_RTNL();
425
426 for_primary_ifa(in_dev) {
427 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
428 return ifa;
429 } endfor_ifa(in_dev);
430 return NULL;
431}
432
433static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
434{
435 struct net *net = sock_net(skb->sk);
436 struct nlattr *tb[IFA_MAX+1];
437 struct in_device *in_dev;
438 struct ifaddrmsg *ifm;
439 struct in_ifaddr *ifa, **ifap;
440 int err = -EINVAL;
441
442 ASSERT_RTNL();
443
444 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
445 if (err < 0)
446 goto errout;
447
448 ifm = nlmsg_data(nlh);
449 in_dev = inetdev_by_index(net, ifm->ifa_index);
450 if (in_dev == NULL) {
451 err = -ENODEV;
452 goto errout;
453 }
454
455 __in_dev_put(in_dev);
456
457 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
458 ifap = &ifa->ifa_next) {
459 if (tb[IFA_LOCAL] &&
460 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
461 continue;
462
463 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
464 continue;
465
466 if (tb[IFA_ADDRESS] &&
467 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
468 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
469 continue;
470
471 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
472 return 0;
473 }
474
475 err = -EADDRNOTAVAIL;
476errout:
477 return err;
478}
479
480static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
481{
482 struct nlattr *tb[IFA_MAX+1];
483 struct in_ifaddr *ifa;
484 struct ifaddrmsg *ifm;
485 struct net_device *dev;
486 struct in_device *in_dev;
487 int err;
488
489 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
490 if (err < 0)
491 goto errout;
492
493 ifm = nlmsg_data(nlh);
494 err = -EINVAL;
495 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
496 goto errout;
497
498 dev = __dev_get_by_index(net, ifm->ifa_index);
499 err = -ENODEV;
500 if (dev == NULL)
501 goto errout;
502
503 in_dev = __in_dev_get_rtnl(dev);
504 err = -ENOBUFS;
505 if (in_dev == NULL)
506 goto errout;
507
508 ifa = inet_alloc_ifa();
509 if (ifa == NULL)
510
511
512
513
514 goto errout;
515
516 ipv4_devconf_setall(in_dev);
517 in_dev_hold(in_dev);
518
519 if (tb[IFA_ADDRESS] == NULL)
520 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
521
522 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
523 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
524 ifa->ifa_flags = ifm->ifa_flags;
525 ifa->ifa_scope = ifm->ifa_scope;
526 ifa->ifa_dev = in_dev;
527
528 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
529 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
530
531 if (tb[IFA_BROADCAST])
532 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
533
534 if (tb[IFA_LABEL])
535 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
536 else
537 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
538
539 return ifa;
540
541errout:
542 return ERR_PTR(err);
543}
544
545static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
546{
547 struct net *net = sock_net(skb->sk);
548 struct in_ifaddr *ifa;
549
550 ASSERT_RTNL();
551
552 ifa = rtm_to_ifaddr(net, nlh);
553 if (IS_ERR(ifa))
554 return PTR_ERR(ifa);
555
556 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
557}
558
559
560
561
562
563static inline int inet_abc_len(__be32 addr)
564{
565 int rc = -1;
566
567 if (ipv4_is_zeronet(addr))
568 rc = 0;
569 else {
570 __u32 haddr = ntohl(addr);
571
572 if (IN_CLASSA(haddr))
573 rc = 8;
574 else if (IN_CLASSB(haddr))
575 rc = 16;
576 else if (IN_CLASSC(haddr))
577 rc = 24;
578 }
579
580 return rc;
581}
582
583
584int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
585{
586 struct ifreq ifr;
587 struct sockaddr_in sin_orig;
588 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
589 struct in_device *in_dev;
590 struct in_ifaddr **ifap = NULL;
591 struct in_ifaddr *ifa = NULL;
592 struct net_device *dev;
593 char *colon;
594 int ret = -EFAULT;
595 int tryaddrmatch = 0;
596
597
598
599
600
601 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
602 goto out;
603 ifr.ifr_name[IFNAMSIZ - 1] = 0;
604
605
606 memcpy(&sin_orig, sin, sizeof(*sin));
607
608 colon = strchr(ifr.ifr_name, ':');
609 if (colon)
610 *colon = 0;
611
612 dev_load(net, ifr.ifr_name);
613
614 switch (cmd) {
615 case SIOCGIFADDR:
616 case SIOCGIFBRDADDR:
617 case SIOCGIFDSTADDR:
618 case SIOCGIFNETMASK:
619
620
621
622
623 tryaddrmatch = (sin_orig.sin_family == AF_INET);
624 memset(sin, 0, sizeof(*sin));
625 sin->sin_family = AF_INET;
626 break;
627
628 case SIOCSIFFLAGS:
629 ret = -EACCES;
630 if (!capable(CAP_NET_ADMIN))
631 goto out;
632 break;
633 case SIOCSIFADDR:
634 case SIOCSIFBRDADDR:
635 case SIOCSIFDSTADDR:
636 case SIOCSIFNETMASK:
637 ret = -EACCES;
638 if (!capable(CAP_NET_ADMIN))
639 goto out;
640 ret = -EINVAL;
641 if (sin->sin_family != AF_INET)
642 goto out;
643 break;
644 default:
645 ret = -EINVAL;
646 goto out;
647 }
648
649 rtnl_lock();
650
651 ret = -ENODEV;
652 dev = __dev_get_by_name(net, ifr.ifr_name);
653 if (!dev)
654 goto done;
655
656 if (colon)
657 *colon = ':';
658
659 in_dev = __in_dev_get_rtnl(dev);
660 if (in_dev) {
661 if (tryaddrmatch) {
662
663
664
665
666
667 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
668 ifap = &ifa->ifa_next) {
669 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
670 sin_orig.sin_addr.s_addr ==
671 ifa->ifa_address) {
672 break;
673 }
674 }
675 }
676
677
678
679 if (!ifa) {
680 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
681 ifap = &ifa->ifa_next)
682 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
683 break;
684 }
685 }
686
687 ret = -EADDRNOTAVAIL;
688 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
689 goto done;
690
691 switch (cmd) {
692 case SIOCGIFADDR:
693 sin->sin_addr.s_addr = ifa->ifa_local;
694 goto rarok;
695
696 case SIOCGIFBRDADDR:
697 sin->sin_addr.s_addr = ifa->ifa_broadcast;
698 goto rarok;
699
700 case SIOCGIFDSTADDR:
701 sin->sin_addr.s_addr = ifa->ifa_address;
702 goto rarok;
703
704 case SIOCGIFNETMASK:
705 sin->sin_addr.s_addr = ifa->ifa_mask;
706 goto rarok;
707
708 case SIOCSIFFLAGS:
709 if (colon) {
710 ret = -EADDRNOTAVAIL;
711 if (!ifa)
712 break;
713 ret = 0;
714 if (!(ifr.ifr_flags & IFF_UP))
715 inet_del_ifa(in_dev, ifap, 1);
716 break;
717 }
718 ret = dev_change_flags(dev, ifr.ifr_flags);
719 break;
720
721 case SIOCSIFADDR:
722 ret = -EINVAL;
723 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
724 break;
725
726 if (!ifa) {
727 ret = -ENOBUFS;
728 ifa = inet_alloc_ifa();
729 if (!ifa)
730 break;
731 if (colon)
732 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
733 else
734 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
735 } else {
736 ret = 0;
737 if (ifa->ifa_local == sin->sin_addr.s_addr)
738 break;
739 inet_del_ifa(in_dev, ifap, 0);
740 ifa->ifa_broadcast = 0;
741 ifa->ifa_scope = 0;
742 }
743
744 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
745
746 if (!(dev->flags & IFF_POINTOPOINT)) {
747 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
748 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
749 if ((dev->flags & IFF_BROADCAST) &&
750 ifa->ifa_prefixlen < 31)
751 ifa->ifa_broadcast = ifa->ifa_address |
752 ~ifa->ifa_mask;
753 } else {
754 ifa->ifa_prefixlen = 32;
755 ifa->ifa_mask = inet_make_mask(32);
756 }
757 ret = inet_set_ifa(dev, ifa);
758 break;
759
760 case SIOCSIFBRDADDR:
761 ret = 0;
762 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
763 inet_del_ifa(in_dev, ifap, 0);
764 ifa->ifa_broadcast = sin->sin_addr.s_addr;
765 inet_insert_ifa(ifa);
766 }
767 break;
768
769 case SIOCSIFDSTADDR:
770 ret = 0;
771 if (ifa->ifa_address == sin->sin_addr.s_addr)
772 break;
773 ret = -EINVAL;
774 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
775 break;
776 ret = 0;
777 inet_del_ifa(in_dev, ifap, 0);
778 ifa->ifa_address = sin->sin_addr.s_addr;
779 inet_insert_ifa(ifa);
780 break;
781
782 case SIOCSIFNETMASK:
783
784
785
786
787 ret = -EINVAL;
788 if (bad_mask(sin->sin_addr.s_addr, 0))
789 break;
790 ret = 0;
791 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
792 __be32 old_mask = ifa->ifa_mask;
793 inet_del_ifa(in_dev, ifap, 0);
794 ifa->ifa_mask = sin->sin_addr.s_addr;
795 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
796
797
798
799
800
801
802
803 if ((dev->flags & IFF_BROADCAST) &&
804 (ifa->ifa_prefixlen < 31) &&
805 (ifa->ifa_broadcast ==
806 (ifa->ifa_local|~old_mask))) {
807 ifa->ifa_broadcast = (ifa->ifa_local |
808 ~sin->sin_addr.s_addr);
809 }
810 inet_insert_ifa(ifa);
811 }
812 break;
813 }
814done:
815 rtnl_unlock();
816out:
817 return ret;
818rarok:
819 rtnl_unlock();
820 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
821 goto out;
822}
823
824static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
825{
826 struct in_device *in_dev = __in_dev_get_rtnl(dev);
827 struct in_ifaddr *ifa;
828 struct ifreq ifr;
829 int done = 0;
830
831 if (!in_dev)
832 goto out;
833
834 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
835 if (!buf) {
836 done += sizeof(ifr);
837 continue;
838 }
839 if (len < (int) sizeof(ifr))
840 break;
841 memset(&ifr, 0, sizeof(struct ifreq));
842 if (ifa->ifa_label)
843 strcpy(ifr.ifr_name, ifa->ifa_label);
844 else
845 strcpy(ifr.ifr_name, dev->name);
846
847 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
848 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
849 ifa->ifa_local;
850
851 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
852 done = -EFAULT;
853 break;
854 }
855 buf += sizeof(struct ifreq);
856 len -= sizeof(struct ifreq);
857 done += sizeof(struct ifreq);
858 }
859out:
860 return done;
861}
862
863__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
864{
865 __be32 addr = 0;
866 struct in_device *in_dev;
867 struct net *net = dev_net(dev);
868
869 rcu_read_lock();
870 in_dev = __in_dev_get_rcu(dev);
871 if (!in_dev)
872 goto no_in_dev;
873
874 for_primary_ifa(in_dev) {
875 if (ifa->ifa_scope > scope)
876 continue;
877 if (!dst || inet_ifa_match(dst, ifa)) {
878 addr = ifa->ifa_local;
879 break;
880 }
881 if (!addr)
882 addr = ifa->ifa_local;
883 } endfor_ifa(in_dev);
884
885 if (addr)
886 goto out_unlock;
887no_in_dev:
888
889
890
891
892
893 for_each_netdev_rcu(net, dev) {
894 in_dev = __in_dev_get_rcu(dev);
895 if (!in_dev)
896 continue;
897
898 for_primary_ifa(in_dev) {
899 if (ifa->ifa_scope != RT_SCOPE_LINK &&
900 ifa->ifa_scope <= scope) {
901 addr = ifa->ifa_local;
902 goto out_unlock;
903 }
904 } endfor_ifa(in_dev);
905 }
906out_unlock:
907 rcu_read_unlock();
908 return addr;
909}
910EXPORT_SYMBOL(inet_select_addr);
911
912static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
913 __be32 local, int scope)
914{
915 int same = 0;
916 __be32 addr = 0;
917
918 for_ifa(in_dev) {
919 if (!addr &&
920 (local == ifa->ifa_local || !local) &&
921 ifa->ifa_scope <= scope) {
922 addr = ifa->ifa_local;
923 if (same)
924 break;
925 }
926 if (!same) {
927 same = (!local || inet_ifa_match(local, ifa)) &&
928 (!dst || inet_ifa_match(dst, ifa));
929 if (same && addr) {
930 if (local || !dst)
931 break;
932
933 if (inet_ifa_match(addr, ifa))
934 break;
935
936 if (ifa->ifa_scope <= scope) {
937 addr = ifa->ifa_local;
938 break;
939 }
940
941 same = 0;
942 }
943 }
944 } endfor_ifa(in_dev);
945
946 return same ? addr : 0;
947}
948
949
950
951
952
953
954
955
956__be32 inet_confirm_addr(struct in_device *in_dev,
957 __be32 dst, __be32 local, int scope)
958{
959 __be32 addr = 0;
960 struct net_device *dev;
961 struct net *net;
962
963 if (scope != RT_SCOPE_LINK)
964 return confirm_addr_indev(in_dev, dst, local, scope);
965
966 net = dev_net(in_dev->dev);
967 rcu_read_lock();
968 for_each_netdev_rcu(net, dev) {
969 in_dev = __in_dev_get_rcu(dev);
970 if (in_dev) {
971 addr = confirm_addr_indev(in_dev, dst, local, scope);
972 if (addr)
973 break;
974 }
975 }
976 rcu_read_unlock();
977
978 return addr;
979}
980
981
982
983
984
985int register_inetaddr_notifier(struct notifier_block *nb)
986{
987 return blocking_notifier_chain_register(&inetaddr_chain, nb);
988}
989EXPORT_SYMBOL(register_inetaddr_notifier);
990
991int unregister_inetaddr_notifier(struct notifier_block *nb)
992{
993 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
994}
995EXPORT_SYMBOL(unregister_inetaddr_notifier);
996
997
998
999
1000static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1001{
1002 struct in_ifaddr *ifa;
1003 int named = 0;
1004
1005 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1006 char old[IFNAMSIZ], *dot;
1007
1008 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1009 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1010 if (named++ == 0)
1011 goto skip;
1012 dot = strchr(old, ':');
1013 if (dot == NULL) {
1014 sprintf(old, ":%d", named);
1015 dot = old;
1016 }
1017 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1018 strcat(ifa->ifa_label, dot);
1019 else
1020 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1021skip:
1022 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1023 }
1024}
1025
1026static inline bool inetdev_valid_mtu(unsigned mtu)
1027{
1028 return mtu >= 68;
1029}
1030
1031
1032
1033static int inetdev_event(struct notifier_block *this, unsigned long event,
1034 void *ptr)
1035{
1036 struct net_device *dev = ptr;
1037 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1038
1039 ASSERT_RTNL();
1040
1041 if (!in_dev) {
1042 if (event == NETDEV_REGISTER) {
1043 in_dev = inetdev_init(dev);
1044 if (!in_dev)
1045 return notifier_from_errno(-ENOMEM);
1046 if (dev->flags & IFF_LOOPBACK) {
1047 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1048 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1049 }
1050 } else if (event == NETDEV_CHANGEMTU) {
1051
1052 if (inetdev_valid_mtu(dev->mtu))
1053 in_dev = inetdev_init(dev);
1054 }
1055 goto out;
1056 }
1057
1058 switch (event) {
1059 case NETDEV_REGISTER:
1060 printk(KERN_DEBUG "inetdev_event: bug\n");
1061 dev->ip_ptr = NULL;
1062 break;
1063 case NETDEV_UP:
1064 if (!inetdev_valid_mtu(dev->mtu))
1065 break;
1066 if (dev->flags & IFF_LOOPBACK) {
1067 struct in_ifaddr *ifa = inet_alloc_ifa();
1068
1069 if (ifa) {
1070 ifa->ifa_local =
1071 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1072 ifa->ifa_prefixlen = 8;
1073 ifa->ifa_mask = inet_make_mask(8);
1074 in_dev_hold(in_dev);
1075 ifa->ifa_dev = in_dev;
1076 ifa->ifa_scope = RT_SCOPE_HOST;
1077 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1078 inet_insert_ifa(ifa);
1079 }
1080 }
1081 ip_mc_up(in_dev);
1082
1083 case NETDEV_CHANGEADDR:
1084
1085 if (IN_DEV_ARP_NOTIFY(in_dev)) {
1086 struct in_ifaddr *ifa = in_dev->ifa_list;
1087
1088 if (ifa)
1089 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1090 ifa->ifa_address, dev,
1091 ifa->ifa_address, NULL,
1092 dev->dev_addr, NULL);
1093 }
1094 break;
1095 case NETDEV_DOWN:
1096 ip_mc_down(in_dev);
1097 break;
1098 case NETDEV_BONDING_OLDTYPE:
1099 ip_mc_unmap(in_dev);
1100 break;
1101 case NETDEV_BONDING_NEWTYPE:
1102 ip_mc_remap(in_dev);
1103 break;
1104 case NETDEV_CHANGEMTU:
1105 if (inetdev_valid_mtu(dev->mtu))
1106 break;
1107
1108 case NETDEV_UNREGISTER:
1109 inetdev_destroy(in_dev);
1110 break;
1111 case NETDEV_CHANGENAME:
1112
1113
1114
1115 inetdev_changename(dev, in_dev);
1116
1117 devinet_sysctl_unregister(in_dev);
1118 devinet_sysctl_register(in_dev);
1119 break;
1120 }
1121out:
1122 return NOTIFY_DONE;
1123}
1124
1125static struct notifier_block ip_netdev_notifier = {
1126 .notifier_call = inetdev_event,
1127};
1128
1129static inline size_t inet_nlmsg_size(void)
1130{
1131 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1132 + nla_total_size(4)
1133 + nla_total_size(4)
1134 + nla_total_size(4)
1135 + nla_total_size(IFNAMSIZ);
1136}
1137
1138static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1139 u32 pid, u32 seq, int event, unsigned int flags)
1140{
1141 struct ifaddrmsg *ifm;
1142 struct nlmsghdr *nlh;
1143
1144 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1145 if (nlh == NULL)
1146 return -EMSGSIZE;
1147
1148 ifm = nlmsg_data(nlh);
1149 ifm->ifa_family = AF_INET;
1150 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1151 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1152 ifm->ifa_scope = ifa->ifa_scope;
1153 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1154
1155 if (ifa->ifa_address)
1156 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1157
1158 if (ifa->ifa_local)
1159 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1160
1161 if (ifa->ifa_broadcast)
1162 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1163
1164 if (ifa->ifa_label[0])
1165 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1166
1167 return nlmsg_end(skb, nlh);
1168
1169nla_put_failure:
1170 nlmsg_cancel(skb, nlh);
1171 return -EMSGSIZE;
1172}
1173
1174static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1175{
1176 struct net *net = sock_net(skb->sk);
1177 int h, s_h;
1178 int idx, s_idx;
1179 int ip_idx, s_ip_idx;
1180 struct net_device *dev;
1181 struct in_device *in_dev;
1182 struct in_ifaddr *ifa;
1183 struct hlist_head *head;
1184 struct hlist_node *node;
1185
1186 s_h = cb->args[0];
1187 s_idx = idx = cb->args[1];
1188 s_ip_idx = ip_idx = cb->args[2];
1189
1190 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1191 idx = 0;
1192 head = &net->dev_index_head[h];
1193 rcu_read_lock();
1194 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1195 if (idx < s_idx)
1196 goto cont;
1197 if (idx > s_idx)
1198 s_ip_idx = 0;
1199 in_dev = __in_dev_get_rcu(dev);
1200 if (!in_dev)
1201 goto cont;
1202
1203 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1204 ifa = ifa->ifa_next, ip_idx++) {
1205 if (ip_idx < s_ip_idx)
1206 continue;
1207 if (inet_fill_ifaddr(skb, ifa,
1208 NETLINK_CB(cb->skb).pid,
1209 cb->nlh->nlmsg_seq,
1210 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1211 rcu_read_unlock();
1212 goto done;
1213 }
1214 }
1215cont:
1216 idx++;
1217 }
1218 rcu_read_unlock();
1219 }
1220
1221done:
1222 cb->args[0] = h;
1223 cb->args[1] = idx;
1224 cb->args[2] = ip_idx;
1225
1226 return skb->len;
1227}
1228
1229static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1230 u32 pid)
1231{
1232 struct sk_buff *skb;
1233 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1234 int err = -ENOBUFS;
1235 struct net *net;
1236
1237 net = dev_net(ifa->ifa_dev->dev);
1238 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1239 if (skb == NULL)
1240 goto errout;
1241
1242 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1243 if (err < 0) {
1244
1245 WARN_ON(err == -EMSGSIZE);
1246 kfree_skb(skb);
1247 goto errout;
1248 }
1249 rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1250 return;
1251errout:
1252 if (err < 0)
1253 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1254}
1255
1256#ifdef CONFIG_SYSCTL
1257
1258static void devinet_copy_dflt_conf(struct net *net, int i)
1259{
1260 struct net_device *dev;
1261
1262 rcu_read_lock();
1263 for_each_netdev_rcu(net, dev) {
1264 struct in_device *in_dev;
1265
1266 in_dev = __in_dev_get_rcu(dev);
1267 if (in_dev && !test_bit(i, in_dev->cnf.state))
1268 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1269 }
1270 rcu_read_unlock();
1271}
1272
1273
1274static void inet_forward_change(struct net *net)
1275{
1276 struct net_device *dev;
1277 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1278
1279 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1280 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1281
1282 for_each_netdev(net, dev) {
1283 struct in_device *in_dev;
1284 if (on)
1285 dev_disable_lro(dev);
1286 rcu_read_lock();
1287 in_dev = __in_dev_get_rcu(dev);
1288 if (in_dev)
1289 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1290 rcu_read_unlock();
1291 }
1292}
1293
1294static int devinet_conf_proc(ctl_table *ctl, int write,
1295 void __user *buffer,
1296 size_t *lenp, loff_t *ppos)
1297{
1298 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1299
1300 if (write) {
1301 struct ipv4_devconf *cnf = ctl->extra1;
1302 struct net *net = ctl->extra2;
1303 int i = (int *)ctl->data - cnf->data;
1304
1305 set_bit(i, cnf->state);
1306
1307 if (cnf == net->ipv4.devconf_dflt)
1308 devinet_copy_dflt_conf(net, i);
1309 }
1310
1311 return ret;
1312}
1313
1314static int devinet_sysctl_forward(ctl_table *ctl, int write,
1315 void __user *buffer,
1316 size_t *lenp, loff_t *ppos)
1317{
1318 int *valp = ctl->data;
1319 int val = *valp;
1320 loff_t pos = *ppos;
1321 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1322
1323 if (write && *valp != val) {
1324 struct net *net = ctl->extra2;
1325
1326 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1327 if (!rtnl_trylock()) {
1328
1329 *valp = val;
1330 *ppos = pos;
1331 return restart_syscall();
1332 }
1333 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1334 inet_forward_change(net);
1335 } else if (*valp) {
1336 struct ipv4_devconf *cnf = ctl->extra1;
1337 struct in_device *idev =
1338 container_of(cnf, struct in_device, cnf);
1339 dev_disable_lro(idev->dev);
1340 }
1341 rtnl_unlock();
1342 rt_cache_flush(net, 0);
1343 }
1344 }
1345
1346 return ret;
1347}
1348
1349int ipv4_doint_and_flush(ctl_table *ctl, int write,
1350 void __user *buffer,
1351 size_t *lenp, loff_t *ppos)
1352{
1353 int *valp = ctl->data;
1354 int val = *valp;
1355 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1356 struct net *net = ctl->extra2;
1357
1358 if (write && *valp != val)
1359 rt_cache_flush(net, 0);
1360
1361 return ret;
1362}
1363
1364#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
1365 { \
1366 .procname = name, \
1367 .data = ipv4_devconf.data + \
1368 NET_IPV4_CONF_ ## attr - 1, \
1369 .maxlen = sizeof(int), \
1370 .mode = mval, \
1371 .proc_handler = proc, \
1372 .extra1 = &ipv4_devconf, \
1373 }
1374
1375#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1376 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
1377
1378#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1379 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
1380
1381#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1382 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
1383
1384#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1385 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
1386
1387static struct devinet_sysctl_table {
1388 struct ctl_table_header *sysctl_header;
1389 struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
1390 char *dev_name;
1391} devinet_sysctl = {
1392 .devinet_vars = {
1393 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1394 devinet_sysctl_forward),
1395 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1396
1397 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1398 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1399 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1400 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1401 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1402 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1403 "accept_source_route"),
1404 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
1405 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
1406 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1407 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1408 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1409 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1410 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1411 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1412 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1413 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1414 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1415 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1416
1417 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1418 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1419 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1420 "force_igmp_version"),
1421 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1422 "promote_secondaries"),
1423 },
1424};
1425
1426static int __devinet_sysctl_register(struct net *net, char *dev_name,
1427 struct ipv4_devconf *p)
1428{
1429 int i;
1430 struct devinet_sysctl_table *t;
1431
1432#define DEVINET_CTL_PATH_DEV 3
1433
1434 struct ctl_path devinet_ctl_path[] = {
1435 { .procname = "net", },
1436 { .procname = "ipv4", },
1437 { .procname = "conf", },
1438 { },
1439 { },
1440 };
1441
1442 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1443 if (!t)
1444 goto out;
1445
1446 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1447 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1448 t->devinet_vars[i].extra1 = p;
1449 t->devinet_vars[i].extra2 = net;
1450 }
1451
1452
1453
1454
1455
1456
1457 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1458 if (!t->dev_name)
1459 goto free;
1460
1461 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1462
1463 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1464 t->devinet_vars);
1465 if (!t->sysctl_header)
1466 goto free_procname;
1467
1468 p->sysctl = t;
1469 return 0;
1470
1471free_procname:
1472 kfree(t->dev_name);
1473free:
1474 kfree(t);
1475out:
1476 return -ENOBUFS;
1477}
1478
1479static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1480{
1481 struct devinet_sysctl_table *t = cnf->sysctl;
1482
1483 if (t == NULL)
1484 return;
1485
1486 cnf->sysctl = NULL;
1487 unregister_sysctl_table(t->sysctl_header);
1488 kfree(t->dev_name);
1489 kfree(t);
1490}
1491
1492static void devinet_sysctl_register(struct in_device *idev)
1493{
1494 neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4,
1495 NET_IPV4_NEIGH, "ipv4", NULL);
1496 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1497 &idev->cnf);
1498}
1499
1500static void devinet_sysctl_unregister(struct in_device *idev)
1501{
1502 __devinet_sysctl_unregister(&idev->cnf);
1503 neigh_sysctl_unregister(idev->arp_parms);
1504}
1505
1506static struct ctl_table ctl_forward_entry[] = {
1507 {
1508 .procname = "ip_forward",
1509 .data = &ipv4_devconf.data[
1510 NET_IPV4_CONF_FORWARDING - 1],
1511 .maxlen = sizeof(int),
1512 .mode = 0644,
1513 .proc_handler = devinet_sysctl_forward,
1514 .extra1 = &ipv4_devconf,
1515 .extra2 = &init_net,
1516 },
1517 { },
1518};
1519
1520static __net_initdata struct ctl_path net_ipv4_path[] = {
1521 { .procname = "net", },
1522 { .procname = "ipv4", },
1523 { },
1524};
1525#endif
1526
1527static __net_init int devinet_init_net(struct net *net)
1528{
1529 int err;
1530 struct ipv4_devconf *all, *dflt;
1531#ifdef CONFIG_SYSCTL
1532 struct ctl_table *tbl = ctl_forward_entry;
1533 struct ctl_table_header *forw_hdr;
1534#endif
1535
1536 err = -ENOMEM;
1537 all = &ipv4_devconf;
1538 dflt = &ipv4_devconf_dflt;
1539
1540 if (!net_eq(net, &init_net)) {
1541 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1542 if (all == NULL)
1543 goto err_alloc_all;
1544
1545 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1546 if (dflt == NULL)
1547 goto err_alloc_dflt;
1548
1549#ifdef CONFIG_SYSCTL
1550 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1551 if (tbl == NULL)
1552 goto err_alloc_ctl;
1553
1554 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1];
1555 tbl[0].extra1 = all;
1556 tbl[0].extra2 = net;
1557#endif
1558 }
1559
1560#ifdef CONFIG_SYSCTL
1561 err = __devinet_sysctl_register(net, "all", all);
1562 if (err < 0)
1563 goto err_reg_all;
1564
1565 err = __devinet_sysctl_register(net, "default", dflt);
1566 if (err < 0)
1567 goto err_reg_dflt;
1568
1569 err = -ENOMEM;
1570 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1571 if (forw_hdr == NULL)
1572 goto err_reg_ctl;
1573 net->ipv4.forw_hdr = forw_hdr;
1574#endif
1575
1576 net->ipv4.devconf_all = all;
1577 net->ipv4.devconf_dflt = dflt;
1578 return 0;
1579
1580#ifdef CONFIG_SYSCTL
1581err_reg_ctl:
1582 __devinet_sysctl_unregister(dflt);
1583err_reg_dflt:
1584 __devinet_sysctl_unregister(all);
1585err_reg_all:
1586 if (tbl != ctl_forward_entry)
1587 kfree(tbl);
1588err_alloc_ctl:
1589#endif
1590 if (dflt != &ipv4_devconf_dflt)
1591 kfree(dflt);
1592err_alloc_dflt:
1593 if (all != &ipv4_devconf)
1594 kfree(all);
1595err_alloc_all:
1596 return err;
1597}
1598
1599static __net_exit void devinet_exit_net(struct net *net)
1600{
1601#ifdef CONFIG_SYSCTL
1602 struct ctl_table *tbl;
1603
1604 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1605 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1606 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1607 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1608 kfree(tbl);
1609#endif
1610 kfree(net->ipv4.devconf_dflt);
1611 kfree(net->ipv4.devconf_all);
1612}
1613
1614static __net_initdata struct pernet_operations devinet_ops = {
1615 .init = devinet_init_net,
1616 .exit = devinet_exit_net,
1617};
1618
1619void __init devinet_init(void)
1620{
1621 register_pernet_subsys(&devinet_ops);
1622
1623 register_gifconf(PF_INET, inet_gifconf);
1624 register_netdevice_notifier(&ip_netdev_notifier);
1625
1626 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1627 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1628 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1629}
1630
1631
