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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / ipv4 / devinet.c
blob382bc768ed565cc79bc79c8c71fa0588d2a7a78b
1 /*
2 * NET3 IP device support routines.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
28
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 #include <linux/slab.h>
54 #ifdef CONFIG_SYSCTL
55 #include <linux/sysctl.h>
56 #endif
57 #include <linux/kmod.h>
58
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/route.h>
62 #include <net/ip_fib.h>
63 #include <net/rtnetlink.h>
64 #include <net/net_namespace.h>
65
66 static struct ipv4_devconf ipv4_devconf = {
67 .data = {
68 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
69 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
70 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
71 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
72 },
73 };
74
75 static struct ipv4_devconf ipv4_devconf_dflt = {
76 .data = {
77 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
78 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
79 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
80 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
81 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
82 },
83 };
84
85 #define IPV4_DEVCONF_DFLT(net, attr) \
86 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
87
88 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
89 [IFA_LOCAL] = { .type = NLA_U32 },
90 [IFA_ADDRESS] = { .type = NLA_U32 },
91 [IFA_BROADCAST] = { .type = NLA_U32 },
92 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
93 };
94
95 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
96
97 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
98 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
99 int destroy);
100 #ifdef CONFIG_SYSCTL
101 static void devinet_sysctl_register(struct in_device *idev);
102 static void devinet_sysctl_unregister(struct in_device *idev);
103 #else
104 static inline void devinet_sysctl_register(struct in_device *idev)
105 {
106 }
107 static inline void devinet_sysctl_unregister(struct in_device *idev)
108 {
109 }
110 #endif
111
112 /* Locks all the inet devices. */
113
114 static struct in_ifaddr *inet_alloc_ifa(void)
115 {
116 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
117 }
118
119 static void inet_rcu_free_ifa(struct rcu_head *head)
120 {
121 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
122 if (ifa->ifa_dev)
123 in_dev_put(ifa->ifa_dev);
124 kfree(ifa);
125 }
126
127 static inline void inet_free_ifa(struct in_ifaddr *ifa)
128 {
129 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
130 }
131
132 void in_dev_finish_destroy(struct in_device *idev)
133 {
134 struct net_device *dev = idev->dev;
135
136 WARN_ON(idev->ifa_list);
137 WARN_ON(idev->mc_list);
138 #ifdef NET_REFCNT_DEBUG
139 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
140 idev, dev ? dev->name : "NIL");
141 #endif
142 dev_put(dev);
143 if (!idev->dead)
144 pr_err("Freeing alive in_device %p\n", idev);
145 else
146 kfree(idev);
147 }
148 EXPORT_SYMBOL(in_dev_finish_destroy);
149
150 static struct in_device *inetdev_init(struct net_device *dev)
151 {
152 struct in_device *in_dev;
153
154 ASSERT_RTNL();
155
156 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
157 if (!in_dev)
158 goto out;
159 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
160 sizeof(in_dev->cnf));
161 in_dev->cnf.sysctl = NULL;
162 in_dev->dev = dev;
163 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
164 if (!in_dev->arp_parms)
165 goto out_kfree;
166 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
167 dev_disable_lro(dev);
168 /* Reference in_dev->dev */
169 dev_hold(dev);
170 /* Account for reference dev->ip_ptr (below) */
171 in_dev_hold(in_dev);
172
173 devinet_sysctl_register(in_dev);
174 ip_mc_init_dev(in_dev);
175 if (dev->flags & IFF_UP)
176 ip_mc_up(in_dev);
177
178 /* we can receive as soon as ip_ptr is set -- do this last */
179 rcu_assign_pointer(dev->ip_ptr, in_dev);
180 out:
181 return in_dev;
182 out_kfree:
183 kfree(in_dev);
184 in_dev = NULL;
185 goto out;
186 }
187
188 static void in_dev_rcu_put(struct rcu_head *head)
189 {
190 struct in_device *idev = container_of(head, struct in_device, rcu_head);
191 in_dev_put(idev);
192 }
193
194 static void inetdev_destroy(struct in_device *in_dev)
195 {
196 struct in_ifaddr *ifa;
197 struct net_device *dev;
198
199 ASSERT_RTNL();
200
201 dev = in_dev->dev;
202
203 in_dev->dead = 1;
204
205 ip_mc_destroy_dev(in_dev);
206
207 while ((ifa = in_dev->ifa_list) != NULL) {
208 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
209 inet_free_ifa(ifa);
210 }
211
212 dev->ip_ptr = NULL;
213
214 devinet_sysctl_unregister(in_dev);
215 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
216 arp_ifdown(dev);
217
218 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
219 }
220
221 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
222 {
223 rcu_read_lock();
224 for_primary_ifa(in_dev) {
225 if (inet_ifa_match(a, ifa)) {
226 if (!b || inet_ifa_match(b, ifa)) {
227 rcu_read_unlock();
228 return 1;
229 }
230 }
231 } endfor_ifa(in_dev);
232 rcu_read_unlock();
233 return 0;
234 }
235
236 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
237 int destroy, struct nlmsghdr *nlh, u32 pid)
238 {
239 struct in_ifaddr *promote = NULL;
240 struct in_ifaddr *ifa, *ifa1 = *ifap;
241 struct in_ifaddr *last_prim = in_dev->ifa_list;
242 struct in_ifaddr *prev_prom = NULL;
243 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
244
245 ASSERT_RTNL();
246
247 /* 1. Deleting primary ifaddr forces deletion all secondaries
248 * unless alias promotion is set
249 **/
250
251 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
252 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
253
254 while ((ifa = *ifap1) != NULL) {
255 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
256 ifa1->ifa_scope <= ifa->ifa_scope)
257 last_prim = ifa;
258
259 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
260 ifa1->ifa_mask != ifa->ifa_mask ||
261 !inet_ifa_match(ifa1->ifa_address, ifa)) {
262 ifap1 = &ifa->ifa_next;
263 prev_prom = ifa;
264 continue;
265 }
266
267 if (!do_promote) {
268 *ifap1 = ifa->ifa_next;
269
270 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
271 blocking_notifier_call_chain(&inetaddr_chain,
272 NETDEV_DOWN, ifa);
273 inet_free_ifa(ifa);
274 } else {
275 promote = ifa;
276 break;
277 }
278 }
279 }
280
281 /* 2. Unlink it */
282
283 *ifap = ifa1->ifa_next;
284
285 /* 3. Announce address deletion */
286
287 /* Send message first, then call notifier.
288 At first sight, FIB update triggered by notifier
289 will refer to already deleted ifaddr, that could confuse
290 netlink listeners. It is not true: look, gated sees
291 that route deleted and if it still thinks that ifaddr
292 is valid, it will try to restore deleted routes... Grr.
293 So that, this order is correct.
294 */
295 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
296 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
297
298 if (promote) {
299
300 if (prev_prom) {
301 prev_prom->ifa_next = promote->ifa_next;
302 promote->ifa_next = last_prim->ifa_next;
303 last_prim->ifa_next = promote;
304 }
305
306 promote->ifa_flags &= ~IFA_F_SECONDARY;
307 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
308 blocking_notifier_call_chain(&inetaddr_chain,
309 NETDEV_UP, promote);
310 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
311 if (ifa1->ifa_mask != ifa->ifa_mask ||
312 !inet_ifa_match(ifa1->ifa_address, ifa))
313 continue;
314 fib_add_ifaddr(ifa);
315 }
316
317 }
318 if (destroy)
319 inet_free_ifa(ifa1);
320 }
321
322 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
323 int destroy)
324 {
325 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
326 }
327
328 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
329 u32 pid)
330 {
331 struct in_device *in_dev = ifa->ifa_dev;
332 struct in_ifaddr *ifa1, **ifap, **last_primary;
333
334 ASSERT_RTNL();
335
336 if (!ifa->ifa_local) {
337 inet_free_ifa(ifa);
338 return 0;
339 }
340
341 ifa->ifa_flags &= ~IFA_F_SECONDARY;
342 last_primary = &in_dev->ifa_list;
343
344 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
345 ifap = &ifa1->ifa_next) {
346 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
347 ifa->ifa_scope <= ifa1->ifa_scope)
348 last_primary = &ifa1->ifa_next;
349 if (ifa1->ifa_mask == ifa->ifa_mask &&
350 inet_ifa_match(ifa1->ifa_address, ifa)) {
351 if (ifa1->ifa_local == ifa->ifa_local) {
352 inet_free_ifa(ifa);
353 return -EEXIST;
354 }
355 if (ifa1->ifa_scope != ifa->ifa_scope) {
356 inet_free_ifa(ifa);
357 return -EINVAL;
358 }
359 ifa->ifa_flags |= IFA_F_SECONDARY;
360 }
361 }
362
363 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
364 net_srandom(ifa->ifa_local);
365 ifap = last_primary;
366 }
367
368 ifa->ifa_next = *ifap;
369 *ifap = ifa;
370
371 /* Send message first, then call notifier.
372 Notifier will trigger FIB update, so that
373 listeners of netlink will know about new ifaddr */
374 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
375 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
376
377 return 0;
378 }
379
380 static int inet_insert_ifa(struct in_ifaddr *ifa)
381 {
382 return __inet_insert_ifa(ifa, NULL, 0);
383 }
384
385 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
386 {
387 struct in_device *in_dev = __in_dev_get_rtnl(dev);
388
389 ASSERT_RTNL();
390
391 if (!in_dev) {
392 inet_free_ifa(ifa);
393 return -ENOBUFS;
394 }
395 ipv4_devconf_setall(in_dev);
396 if (ifa->ifa_dev != in_dev) {
397 WARN_ON(ifa->ifa_dev);
398 in_dev_hold(in_dev);
399 ifa->ifa_dev = in_dev;
400 }
401 if (ipv4_is_loopback(ifa->ifa_local))
402 ifa->ifa_scope = RT_SCOPE_HOST;
403 return inet_insert_ifa(ifa);
404 }
405
406 struct in_device *inetdev_by_index(struct net *net, int ifindex)
407 {
408 struct net_device *dev;
409 struct in_device *in_dev = NULL;
410
411 rcu_read_lock();
412 dev = dev_get_by_index_rcu(net, ifindex);
413 if (dev)
414 in_dev = in_dev_get(dev);
415 rcu_read_unlock();
416 return in_dev;
417 }
418 EXPORT_SYMBOL(inetdev_by_index);
419
420 /* Called only from RTNL semaphored context. No locks. */
421
422 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
423 __be32 mask)
424 {
425 ASSERT_RTNL();
426
427 for_primary_ifa(in_dev) {
428 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
429 return ifa;
430 } endfor_ifa(in_dev);
431 return NULL;
432 }
433
434 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
435 {
436 struct net *net = sock_net(skb->sk);
437 struct nlattr *tb[IFA_MAX+1];
438 struct in_device *in_dev;
439 struct ifaddrmsg *ifm;
440 struct in_ifaddr *ifa, **ifap;
441 int err = -EINVAL;
442
443 ASSERT_RTNL();
444
445 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
446 if (err < 0)
447 goto errout;
448
449 ifm = nlmsg_data(nlh);
450 in_dev = inetdev_by_index(net, ifm->ifa_index);
451 if (in_dev == NULL) {
452 err = -ENODEV;
453 goto errout;
454 }
455
456 __in_dev_put(in_dev);
457
458 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
459 ifap = &ifa->ifa_next) {
460 if (tb[IFA_LOCAL] &&
461 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
462 continue;
463
464 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
465 continue;
466
467 if (tb[IFA_ADDRESS] &&
468 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
469 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
470 continue;
471
472 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
473 return 0;
474 }
475
476 err = -EADDRNOTAVAIL;
477 errout:
478 return err;
479 }
480
481 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
482 {
483 struct nlattr *tb[IFA_MAX+1];
484 struct in_ifaddr *ifa;
485 struct ifaddrmsg *ifm;
486 struct net_device *dev;
487 struct in_device *in_dev;
488 int err;
489
490 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
491 if (err < 0)
492 goto errout;
493
494 ifm = nlmsg_data(nlh);
495 err = -EINVAL;
496 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
497 goto errout;
498
499 dev = __dev_get_by_index(net, ifm->ifa_index);
500 err = -ENODEV;
501 if (dev == NULL)
502 goto errout;
503
504 in_dev = __in_dev_get_rtnl(dev);
505 err = -ENOBUFS;
506 if (in_dev == NULL)
507 goto errout;
508
509 ifa = inet_alloc_ifa();
510 if (ifa == NULL)
511 /*
512 * A potential indev allocation can be left alive, it stays
513 * assigned to its device and is destroy with it.
514 */
515 goto errout;
516
517 ipv4_devconf_setall(in_dev);
518 in_dev_hold(in_dev);
519
520 if (tb[IFA_ADDRESS] == NULL)
521 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
522
523 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
524 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
525 ifa->ifa_flags = ifm->ifa_flags;
526 ifa->ifa_scope = ifm->ifa_scope;
527 ifa->ifa_dev = in_dev;
528
529 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
530 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
531
532 if (tb[IFA_BROADCAST])
533 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
534
535 if (tb[IFA_LABEL])
536 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
537 else
538 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
539
540 return ifa;
541
542 errout:
543 return ERR_PTR(err);
544 }
545
546 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
547 {
548 struct net *net = sock_net(skb->sk);
549 struct in_ifaddr *ifa;
550
551 ASSERT_RTNL();
552
553 ifa = rtm_to_ifaddr(net, nlh);
554 if (IS_ERR(ifa))
555 return PTR_ERR(ifa);
556
557 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
558 }
559
560 /*
561 * Determine a default network mask, based on the IP address.
562 */
563
564 static inline int inet_abc_len(__be32 addr)
565 {
566 int rc = -1; /* Something else, probably a multicast. */
567
568 if (ipv4_is_zeronet(addr))
569 rc = 0;
570 else {
571 __u32 haddr = ntohl(addr);
572
573 if (IN_CLASSA(haddr))
574 rc = 8;
575 else if (IN_CLASSB(haddr))
576 rc = 16;
577 else if (IN_CLASSC(haddr))
578 rc = 24;
579 }
580
581 return rc;
582 }
583
584
585 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
586 {
587 struct ifreq ifr;
588 struct sockaddr_in sin_orig;
589 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
590 struct in_device *in_dev;
591 struct in_ifaddr **ifap = NULL;
592 struct in_ifaddr *ifa = NULL;
593 struct net_device *dev;
594 char *colon;
595 int ret = -EFAULT;
596 int tryaddrmatch = 0;
597
598 /*
599 * Fetch the caller's info block into kernel space
600 */
601
602 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
603 goto out;
604 ifr.ifr_name[IFNAMSIZ - 1] = 0;
605
606 /* save original address for comparison */
607 memcpy(&sin_orig, sin, sizeof(*sin));
608
609 colon = strchr(ifr.ifr_name, ':');
610 if (colon)
611 *colon = 0;
612
613 dev_load(net, ifr.ifr_name);
614
615 switch (cmd) {
616 case SIOCGIFADDR: /* Get interface address */
617 case SIOCGIFBRDADDR: /* Get the broadcast address */
618 case SIOCGIFDSTADDR: /* Get the destination address */
619 case SIOCGIFNETMASK: /* Get the netmask for the interface */
620 /* Note that these ioctls will not sleep,
621 so that we do not impose a lock.
622 One day we will be forced to put shlock here (I mean SMP)
623 */
624 tryaddrmatch = (sin_orig.sin_family == AF_INET);
625 memset(sin, 0, sizeof(*sin));
626 sin->sin_family = AF_INET;
627 break;
628
629 case SIOCSIFFLAGS:
630 ret = -EACCES;
631 if (!capable(CAP_NET_ADMIN))
632 goto out;
633 break;
634 case SIOCSIFADDR: /* Set interface address (and family) */
635 case SIOCSIFBRDADDR: /* Set the broadcast address */
636 case SIOCSIFDSTADDR: /* Set the destination address */
637 case SIOCSIFNETMASK: /* Set the netmask for the interface */
638 ret = -EACCES;
639 if (!capable(CAP_NET_ADMIN))
640 goto out;
641 ret = -EINVAL;
642 if (sin->sin_family != AF_INET)
643 goto out;
644 break;
645 default:
646 ret = -EINVAL;
647 goto out;
648 }
649
650 rtnl_lock();
651
652 ret = -ENODEV;
653 dev = __dev_get_by_name(net, ifr.ifr_name);
654 if (!dev)
655 goto done;
656
657 if (colon)
658 *colon = ':';
659
660 in_dev = __in_dev_get_rtnl(dev);
661 if (in_dev) {
662 if (tryaddrmatch) {
663 /* Matthias Andree */
664 /* compare label and address (4.4BSD style) */
665 /* note: we only do this for a limited set of ioctls
666 and only if the original address family was AF_INET.
667 This is checked above. */
668 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
669 ifap = &ifa->ifa_next) {
670 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
671 sin_orig.sin_addr.s_addr ==
672 ifa->ifa_address) {
673 break; /* found */
674 }
675 }
676 }
677 /* we didn't get a match, maybe the application is
678 4.3BSD-style and passed in junk so we fall back to
679 comparing just the label */
680 if (!ifa) {
681 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
682 ifap = &ifa->ifa_next)
683 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
684 break;
685 }
686 }
687
688 ret = -EADDRNOTAVAIL;
689 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
690 goto done;
691
692 switch (cmd) {
693 case SIOCGIFADDR: /* Get interface address */
694 sin->sin_addr.s_addr = ifa->ifa_local;
695 goto rarok;
696
697 case SIOCGIFBRDADDR: /* Get the broadcast address */
698 sin->sin_addr.s_addr = ifa->ifa_broadcast;
699 goto rarok;
700
701 case SIOCGIFDSTADDR: /* Get the destination address */
702 sin->sin_addr.s_addr = ifa->ifa_address;
703 goto rarok;
704
705 case SIOCGIFNETMASK: /* Get the netmask for the interface */
706 sin->sin_addr.s_addr = ifa->ifa_mask;
707 goto rarok;
708
709 case SIOCSIFFLAGS:
710 if (colon) {
711 ret = -EADDRNOTAVAIL;
712 if (!ifa)
713 break;
714 ret = 0;
715 if (!(ifr.ifr_flags & IFF_UP))
716 inet_del_ifa(in_dev, ifap, 1);
717 break;
718 }
719 ret = dev_change_flags(dev, ifr.ifr_flags);
720 break;
721
722 case SIOCSIFADDR: /* Set interface address (and family) */
723 ret = -EINVAL;
724 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
725 break;
726
727 if (!ifa) {
728 ret = -ENOBUFS;
729 ifa = inet_alloc_ifa();
730 if (!ifa)
731 break;
732 if (colon)
733 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
734 else
735 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
736 } else {
737 ret = 0;
738 if (ifa->ifa_local == sin->sin_addr.s_addr)
739 break;
740 inet_del_ifa(in_dev, ifap, 0);
741 ifa->ifa_broadcast = 0;
742 ifa->ifa_scope = 0;
743 }
744
745 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
746
747 if (!(dev->flags & IFF_POINTOPOINT)) {
748 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
749 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
750 if ((dev->flags & IFF_BROADCAST) &&
751 ifa->ifa_prefixlen < 31)
752 ifa->ifa_broadcast = ifa->ifa_address |
753 ~ifa->ifa_mask;
754 } else {
755 ifa->ifa_prefixlen = 32;
756 ifa->ifa_mask = inet_make_mask(32);
757 }
758 ret = inet_set_ifa(dev, ifa);
759 break;
760
761 case SIOCSIFBRDADDR: /* Set the broadcast address */
762 ret = 0;
763 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
764 inet_del_ifa(in_dev, ifap, 0);
765 ifa->ifa_broadcast = sin->sin_addr.s_addr;
766 inet_insert_ifa(ifa);
767 }
768 break;
769
770 case SIOCSIFDSTADDR: /* Set the destination address */
771 ret = 0;
772 if (ifa->ifa_address == sin->sin_addr.s_addr)
773 break;
774 ret = -EINVAL;
775 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
776 break;
777 ret = 0;
778 inet_del_ifa(in_dev, ifap, 0);
779 ifa->ifa_address = sin->sin_addr.s_addr;
780 inet_insert_ifa(ifa);
781 break;
782
783 case SIOCSIFNETMASK: /* Set the netmask for the interface */
784
785 /*
786 * The mask we set must be legal.
787 */
788 ret = -EINVAL;
789 if (bad_mask(sin->sin_addr.s_addr, 0))
790 break;
791 ret = 0;
792 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
793 __be32 old_mask = ifa->ifa_mask;
794 inet_del_ifa(in_dev, ifap, 0);
795 ifa->ifa_mask = sin->sin_addr.s_addr;
796 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
797
798 /* See if current broadcast address matches
799 * with current netmask, then recalculate
800 * the broadcast address. Otherwise it's a
801 * funny address, so don't touch it since
802 * the user seems to know what (s)he's doing...
803 */
804 if ((dev->flags & IFF_BROADCAST) &&
805 (ifa->ifa_prefixlen < 31) &&
806 (ifa->ifa_broadcast ==
807 (ifa->ifa_local|~old_mask))) {
808 ifa->ifa_broadcast = (ifa->ifa_local |
809 ~sin->sin_addr.s_addr);
810 }
811 inet_insert_ifa(ifa);
812 }
813 break;
814 }
815 done:
816 rtnl_unlock();
817 out:
818 return ret;
819 rarok:
820 rtnl_unlock();
821 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
822 goto out;
823 }
824
825 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
826 {
827 struct in_device *in_dev = __in_dev_get_rtnl(dev);
828 struct in_ifaddr *ifa;
829 struct ifreq ifr;
830 int done = 0;
831
832 if (!in_dev)
833 goto out;
834
835 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
836 if (!buf) {
837 done += sizeof(ifr);
838 continue;
839 }
840 if (len < (int) sizeof(ifr))
841 break;
842 memset(&ifr, 0, sizeof(struct ifreq));
843 if (ifa->ifa_label)
844 strcpy(ifr.ifr_name, ifa->ifa_label);
845 else
846 strcpy(ifr.ifr_name, dev->name);
847
848 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
849 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
850 ifa->ifa_local;
851
852 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
853 done = -EFAULT;
854 break;
855 }
856 buf += sizeof(struct ifreq);
857 len -= sizeof(struct ifreq);
858 done += sizeof(struct ifreq);
859 }
860 out:
861 return done;
862 }
863
864 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
865 {
866 __be32 addr = 0;
867 struct in_device *in_dev;
868 struct net *net = dev_net(dev);
869
870 rcu_read_lock();
871 in_dev = __in_dev_get_rcu(dev);
872 if (!in_dev)
873 goto no_in_dev;
874
875 for_primary_ifa(in_dev) {
876 if (ifa->ifa_scope > scope)
877 continue;
878 if (!dst || inet_ifa_match(dst, ifa)) {
879 addr = ifa->ifa_local;
880 break;
881 }
882 if (!addr)
883 addr = ifa->ifa_local;
884 } endfor_ifa(in_dev);
885
886 if (addr)
887 goto out_unlock;
888 no_in_dev:
889
890 /* Not loopback addresses on loopback should be preferred
891 in this case. It is importnat that lo is the first interface
892 in dev_base list.
893 */
894 for_each_netdev_rcu(net, dev) {
895 in_dev = __in_dev_get_rcu(dev);
896 if (!in_dev)
897 continue;
898
899 for_primary_ifa(in_dev) {
900 if (ifa->ifa_scope != RT_SCOPE_LINK &&
901 ifa->ifa_scope <= scope) {
902 addr = ifa->ifa_local;
903 goto out_unlock;
904 }
905 } endfor_ifa(in_dev);
906 }
907 out_unlock:
908 rcu_read_unlock();
909 return addr;
910 }
911 EXPORT_SYMBOL(inet_select_addr);
912
913 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
914 __be32 local, int scope)
915 {
916 int same = 0;
917 __be32 addr = 0;
918
919 for_ifa(in_dev) {
920 if (!addr &&
921 (local == ifa->ifa_local || !local) &&
922 ifa->ifa_scope <= scope) {
923 addr = ifa->ifa_local;
924 if (same)
925 break;
926 }
927 if (!same) {
928 same = (!local || inet_ifa_match(local, ifa)) &&
929 (!dst || inet_ifa_match(dst, ifa));
930 if (same && addr) {
931 if (local || !dst)
932 break;
933 /* Is the selected addr into dst subnet? */
934 if (inet_ifa_match(addr, ifa))
935 break;
936 /* No, then can we use new local src? */
937 if (ifa->ifa_scope <= scope) {
938 addr = ifa->ifa_local;
939 break;
940 }
941 /* search for large dst subnet for addr */
942 same = 0;
943 }
944 }
945 } endfor_ifa(in_dev);
946
947 return same ? addr : 0;
948 }
949
950 /*
951 * Confirm that local IP address exists using wildcards:
952 * - in_dev: only on this interface, 0=any interface
953 * - dst: only in the same subnet as dst, 0=any dst
954 * - local: address, 0=autoselect the local address
955 * - scope: maximum allowed scope value for the local address
956 */
957 __be32 inet_confirm_addr(struct in_device *in_dev,
958 __be32 dst, __be32 local, int scope)
959 {
960 __be32 addr = 0;
961 struct net_device *dev;
962 struct net *net;
963
964 if (scope != RT_SCOPE_LINK)
965 return confirm_addr_indev(in_dev, dst, local, scope);
966
967 net = dev_net(in_dev->dev);
968 rcu_read_lock();
969 for_each_netdev_rcu(net, dev) {
970 in_dev = __in_dev_get_rcu(dev);
971 if (in_dev) {
972 addr = confirm_addr_indev(in_dev, dst, local, scope);
973 if (addr)
974 break;
975 }
976 }
977 rcu_read_unlock();
978
979 return addr;
980 }
981
982 /*
983 * Device notifier
984 */
985
986 int register_inetaddr_notifier(struct notifier_block *nb)
987 {
988 return blocking_notifier_chain_register(&inetaddr_chain, nb);
989 }
990 EXPORT_SYMBOL(register_inetaddr_notifier);
991
992 int unregister_inetaddr_notifier(struct notifier_block *nb)
993 {
994 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
995 }
996 EXPORT_SYMBOL(unregister_inetaddr_notifier);
997
998 /* Rename ifa_labels for a device name change. Make some effort to preserve
999 * existing alias numbering and to create unique labels if possible.
1000 */
1001 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1002 {
1003 struct in_ifaddr *ifa;
1004 int named = 0;
1005
1006 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1007 char old[IFNAMSIZ], *dot;
1008
1009 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1010 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1011 if (named++ == 0)
1012 goto skip;
1013 dot = strchr(old, ':');
1014 if (dot == NULL) {
1015 sprintf(old, ":%d", named);
1016 dot = old;
1017 }
1018 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1019 strcat(ifa->ifa_label, dot);
1020 else
1021 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1022 skip:
1023 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1024 }
1025 }
1026
1027 static inline bool inetdev_valid_mtu(unsigned mtu)
1028 {
1029 return mtu >= 68;
1030 }
1031
1032 /* Called only under RTNL semaphore */
1033
1034 static int inetdev_event(struct notifier_block *this, unsigned long event,
1035 void *ptr)
1036 {
1037 struct net_device *dev = ptr;
1038 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1039
1040 ASSERT_RTNL();
1041
1042 if (!in_dev) {
1043 if (event == NETDEV_REGISTER) {
1044 in_dev = inetdev_init(dev);
1045 if (!in_dev)
1046 return notifier_from_errno(-ENOMEM);
1047 if (dev->flags & IFF_LOOPBACK) {
1048 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1049 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1050 }
1051 } else if (event == NETDEV_CHANGEMTU) {
1052 /* Re-enabling IP */
1053 if (inetdev_valid_mtu(dev->mtu))
1054 in_dev = inetdev_init(dev);
1055 }
1056 goto out;
1057 }
1058
1059 switch (event) {
1060 case NETDEV_REGISTER:
1061 printk(KERN_DEBUG "inetdev_event: bug\n");
1062 dev->ip_ptr = NULL;
1063 break;
1064 case NETDEV_UP:
1065 if (!inetdev_valid_mtu(dev->mtu))
1066 break;
1067 if (dev->flags & IFF_LOOPBACK) {
1068 struct in_ifaddr *ifa = inet_alloc_ifa();
1069
1070 if (ifa) {
1071 ifa->ifa_local =
1072 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1073 ifa->ifa_prefixlen = 8;
1074 ifa->ifa_mask = inet_make_mask(8);
1075 in_dev_hold(in_dev);
1076 ifa->ifa_dev = in_dev;
1077 ifa->ifa_scope = RT_SCOPE_HOST;
1078 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1079 inet_insert_ifa(ifa);
1080 }
1081 }
1082 ip_mc_up(in_dev);
1083 /* fall through */
1084 case NETDEV_CHANGEADDR:
1085 /* Send gratuitous ARP to notify of link change */
1086 if (IN_DEV_ARP_NOTIFY(in_dev)) {
1087 struct in_ifaddr *ifa = in_dev->ifa_list;
1088
1089 if (ifa)
1090 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1091 ifa->ifa_address, dev,
1092 ifa->ifa_address, NULL,
1093 dev->dev_addr, NULL);
1094 }
1095 break;
1096 case NETDEV_DOWN:
1097 ip_mc_down(in_dev);
1098 break;
1099 case NETDEV_PRE_TYPE_CHANGE:
1100 ip_mc_unmap(in_dev);
1101 break;
1102 case NETDEV_POST_TYPE_CHANGE:
1103 ip_mc_remap(in_dev);
1104 break;
1105 case NETDEV_CHANGEMTU:
1106 if (inetdev_valid_mtu(dev->mtu))
1107 break;
1108 /* disable IP when MTU is not enough */
1109 case NETDEV_UNREGISTER:
1110 inetdev_destroy(in_dev);
1111 break;
1112 case NETDEV_CHANGENAME:
1113 /* Do not notify about label change, this event is
1114 * not interesting to applications using netlink.
1115 */
1116 inetdev_changename(dev, in_dev);
1117
1118 devinet_sysctl_unregister(in_dev);
1119 devinet_sysctl_register(in_dev);
1120 break;
1121 }
1122 out:
1123 return NOTIFY_DONE;
1124 }
1125
1126 static struct notifier_block ip_netdev_notifier = {
1127 .notifier_call = inetdev_event,
1128 };
1129
1130 static inline size_t inet_nlmsg_size(void)
1131 {
1132 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1133 + nla_total_size(4) /* IFA_ADDRESS */
1134 + nla_total_size(4) /* IFA_LOCAL */
1135 + nla_total_size(4) /* IFA_BROADCAST */
1136 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1137 }
1138
1139 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1140 u32 pid, u32 seq, int event, unsigned int flags)
1141 {
1142 struct ifaddrmsg *ifm;
1143 struct nlmsghdr *nlh;
1144
1145 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1146 if (nlh == NULL)
1147 return -EMSGSIZE;
1148
1149 ifm = nlmsg_data(nlh);
1150 ifm->ifa_family = AF_INET;
1151 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1152 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1153 ifm->ifa_scope = ifa->ifa_scope;
1154 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1155
1156 if (ifa->ifa_address)
1157 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1158
1159 if (ifa->ifa_local)
1160 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1161
1162 if (ifa->ifa_broadcast)
1163 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1164
1165 if (ifa->ifa_label[0])
1166 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1167
1168 return nlmsg_end(skb, nlh);
1169
1170 nla_put_failure:
1171 nlmsg_cancel(skb, nlh);
1172 return -EMSGSIZE;
1173 }
1174
1175 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1176 {
1177 struct net *net = sock_net(skb->sk);
1178 int h, s_h;
1179 int idx, s_idx;
1180 int ip_idx, s_ip_idx;
1181 struct net_device *dev;
1182 struct in_device *in_dev;
1183 struct in_ifaddr *ifa;
1184 struct hlist_head *head;
1185 struct hlist_node *node;
1186
1187 s_h = cb->args[0];
1188 s_idx = idx = cb->args[1];
1189 s_ip_idx = ip_idx = cb->args[2];
1190
1191 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1192 idx = 0;
1193 head = &net->dev_index_head[h];
1194 rcu_read_lock();
1195 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1196 if (idx < s_idx)
1197 goto cont;
1198 if (h > s_h || idx > s_idx)
1199 s_ip_idx = 0;
1200 in_dev = __in_dev_get_rcu(dev);
1201 if (!in_dev)
1202 goto cont;
1203
1204 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1205 ifa = ifa->ifa_next, ip_idx++) {
1206 if (ip_idx < s_ip_idx)
1207 continue;
1208 if (inet_fill_ifaddr(skb, ifa,
1209 NETLINK_CB(cb->skb).pid,
1210 cb->nlh->nlmsg_seq,
1211 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1212 rcu_read_unlock();
1213 goto done;
1214 }
1215 }
1216 cont:
1217 idx++;
1218 }
1219 rcu_read_unlock();
1220 }
1221
1222 done:
1223 cb->args[0] = h;
1224 cb->args[1] = idx;
1225 cb->args[2] = ip_idx;
1226
1227 return skb->len;
1228 }
1229
1230 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1231 u32 pid)
1232 {
1233 struct sk_buff *skb;
1234 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1235 int err = -ENOBUFS;
1236 struct net *net;
1237
1238 net = dev_net(ifa->ifa_dev->dev);
1239 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1240 if (skb == NULL)
1241 goto errout;
1242
1243 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1244 if (err < 0) {
1245 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1246 WARN_ON(err == -EMSGSIZE);
1247 kfree_skb(skb);
1248 goto errout;
1249 }
1250 rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1251 return;
1252 errout:
1253 if (err < 0)
1254 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1255 }
1256
1257 #ifdef CONFIG_SYSCTL
1258
1259 static void devinet_copy_dflt_conf(struct net *net, int i)
1260 {
1261 struct net_device *dev;
1262
1263 rcu_read_lock();
1264 for_each_netdev_rcu(net, dev) {
1265 struct in_device *in_dev;
1266
1267 in_dev = __in_dev_get_rcu(dev);
1268 if (in_dev && !test_bit(i, in_dev->cnf.state))
1269 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1270 }
1271 rcu_read_unlock();
1272 }
1273
1274 /* called with RTNL locked */
1275 static void inet_forward_change(struct net *net)
1276 {
1277 struct net_device *dev;
1278 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1279
1280 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1281 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1282
1283 for_each_netdev(net, dev) {
1284 struct in_device *in_dev;
1285 if (on)
1286 dev_disable_lro(dev);
1287 rcu_read_lock();
1288 in_dev = __in_dev_get_rcu(dev);
1289 if (in_dev)
1290 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1291 rcu_read_unlock();
1292 }
1293 }
1294
1295 static int devinet_conf_proc(ctl_table *ctl, int write,
1296 void __user *buffer,
1297 size_t *lenp, loff_t *ppos)
1298 {
1299 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1300
1301 if (write) {
1302 struct ipv4_devconf *cnf = ctl->extra1;
1303 struct net *net = ctl->extra2;
1304 int i = (int *)ctl->data - cnf->data;
1305
1306 set_bit(i, cnf->state);
1307
1308 if (cnf == net->ipv4.devconf_dflt)
1309 devinet_copy_dflt_conf(net, i);
1310 }
1311
1312 return ret;
1313 }
1314
1315 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1316 void __user *buffer,
1317 size_t *lenp, loff_t *ppos)
1318 {
1319 int *valp = ctl->data;
1320 int val = *valp;
1321 loff_t pos = *ppos;
1322 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1323
1324 if (write && *valp != val) {
1325 struct net *net = ctl->extra2;
1326
1327 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1328 if (!rtnl_trylock()) {
1329 /* Restore the original values before restarting */
1330 *valp = val;
1331 *ppos = pos;
1332 return restart_syscall();
1333 }
1334 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1335 inet_forward_change(net);
1336 } else if (*valp) {
1337 struct ipv4_devconf *cnf = ctl->extra1;
1338 struct in_device *idev =
1339 container_of(cnf, struct in_device, cnf);
1340 dev_disable_lro(idev->dev);
1341 }
1342 rtnl_unlock();
1343 rt_cache_flush(net, 0);
1344 }
1345 }
1346
1347 return ret;
1348 }
1349
1350 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1351 void __user *buffer,
1352 size_t *lenp, loff_t *ppos)
1353 {
1354 int *valp = ctl->data;
1355 int val = *valp;
1356 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1357 struct net *net = ctl->extra2;
1358
1359 if (write && *valp != val)
1360 rt_cache_flush(net, 0);
1361
1362 return ret;
1363 }
1364
1365 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
1366 { \
1367 .procname = name, \
1368 .data = ipv4_devconf.data + \
1369 IPV4_DEVCONF_ ## attr - 1, \
1370 .maxlen = sizeof(int), \
1371 .mode = mval, \
1372 .proc_handler = proc, \
1373 .extra1 = &ipv4_devconf, \
1374 }
1375
1376 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1377 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
1378
1379 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1380 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
1381
1382 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1383 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
1384
1385 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1386 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
1387
1388 static struct devinet_sysctl_table {
1389 struct ctl_table_header *sysctl_header;
1390 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1391 char *dev_name;
1392 } devinet_sysctl = {
1393 .devinet_vars = {
1394 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1395 devinet_sysctl_forward),
1396 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1397
1398 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1399 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1400 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1401 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1402 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1403 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1404 "accept_source_route"),
1405 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
1406 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
1407 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1408 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1409 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1410 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1411 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1412 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1413 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1414 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1415 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1416 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1417 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
1418
1419 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1420 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1421 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1422 "force_igmp_version"),
1423 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1424 "promote_secondaries"),
1425 },
1426 };
1427
1428 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1429 struct ipv4_devconf *p)
1430 {
1431 int i;
1432 struct devinet_sysctl_table *t;
1433
1434 #define DEVINET_CTL_PATH_DEV 3
1435
1436 struct ctl_path devinet_ctl_path[] = {
1437 { .procname = "net", },
1438 { .procname = "ipv4", },
1439 { .procname = "conf", },
1440 { /* to be set */ },
1441 { },
1442 };
1443
1444 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1445 if (!t)
1446 goto out;
1447
1448 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1449 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1450 t->devinet_vars[i].extra1 = p;
1451 t->devinet_vars[i].extra2 = net;
1452 }
1453
1454 /*
1455 * Make a copy of dev_name, because '.procname' is regarded as const
1456 * by sysctl and we wouldn't want anyone to change it under our feet
1457 * (see SIOCSIFNAME).
1458 */
1459 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1460 if (!t->dev_name)
1461 goto free;
1462
1463 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1464
1465 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1466 t->devinet_vars);
1467 if (!t->sysctl_header)
1468 goto free_procname;
1469
1470 p->sysctl = t;
1471 return 0;
1472
1473 free_procname:
1474 kfree(t->dev_name);
1475 free:
1476 kfree(t);
1477 out:
1478 return -ENOBUFS;
1479 }
1480
1481 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1482 {
1483 struct devinet_sysctl_table *t = cnf->sysctl;
1484
1485 if (t == NULL)
1486 return;
1487
1488 cnf->sysctl = NULL;
1489 unregister_sysctl_table(t->sysctl_header);
1490 kfree(t->dev_name);
1491 kfree(t);
1492 }
1493
1494 static void devinet_sysctl_register(struct in_device *idev)
1495 {
1496 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
1497 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1498 &idev->cnf);
1499 }
1500
1501 static void devinet_sysctl_unregister(struct in_device *idev)
1502 {
1503 __devinet_sysctl_unregister(&idev->cnf);
1504 neigh_sysctl_unregister(idev->arp_parms);
1505 }
1506
1507 static struct ctl_table ctl_forward_entry[] = {
1508 {
1509 .procname = "ip_forward",
1510 .data = &ipv4_devconf.data[
1511 IPV4_DEVCONF_FORWARDING - 1],
1512 .maxlen = sizeof(int),
1513 .mode = 0644,
1514 .proc_handler = devinet_sysctl_forward,
1515 .extra1 = &ipv4_devconf,
1516 .extra2 = &init_net,
1517 },
1518 { },
1519 };
1520
1521 static __net_initdata struct ctl_path net_ipv4_path[] = {
1522 { .procname = "net", },
1523 { .procname = "ipv4", },
1524 { },
1525 };
1526 #endif
1527
1528 static __net_init int devinet_init_net(struct net *net)
1529 {
1530 int err;
1531 struct ipv4_devconf *all, *dflt;
1532 #ifdef CONFIG_SYSCTL
1533 struct ctl_table *tbl = ctl_forward_entry;
1534 struct ctl_table_header *forw_hdr;
1535 #endif
1536
1537 err = -ENOMEM;
1538 all = &ipv4_devconf;
1539 dflt = &ipv4_devconf_dflt;
1540
1541 if (!net_eq(net, &init_net)) {
1542 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1543 if (all == NULL)
1544 goto err_alloc_all;
1545
1546 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1547 if (dflt == NULL)
1548 goto err_alloc_dflt;
1549
1550 #ifdef CONFIG_SYSCTL
1551 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1552 if (tbl == NULL)
1553 goto err_alloc_ctl;
1554
1555 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
1556 tbl[0].extra1 = all;
1557 tbl[0].extra2 = net;
1558 #endif
1559 }
1560
1561 #ifdef CONFIG_SYSCTL
1562 err = __devinet_sysctl_register(net, "all", all);
1563 if (err < 0)
1564 goto err_reg_all;
1565
1566 err = __devinet_sysctl_register(net, "default", dflt);
1567 if (err < 0)
1568 goto err_reg_dflt;
1569
1570 err = -ENOMEM;
1571 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1572 if (forw_hdr == NULL)
1573 goto err_reg_ctl;
1574 net->ipv4.forw_hdr = forw_hdr;
1575 #endif
1576
1577 net->ipv4.devconf_all = all;
1578 net->ipv4.devconf_dflt = dflt;
1579 return 0;
1580
1581 #ifdef CONFIG_SYSCTL
1582 err_reg_ctl:
1583 __devinet_sysctl_unregister(dflt);
1584 err_reg_dflt:
1585 __devinet_sysctl_unregister(all);
1586 err_reg_all:
1587 if (tbl != ctl_forward_entry)
1588 kfree(tbl);
1589 err_alloc_ctl:
1590 #endif
1591 if (dflt != &ipv4_devconf_dflt)
1592 kfree(dflt);
1593 err_alloc_dflt:
1594 if (all != &ipv4_devconf)
1595 kfree(all);
1596 err_alloc_all:
1597 return err;
1598 }
1599
1600 static __net_exit void devinet_exit_net(struct net *net)
1601 {
1602 #ifdef CONFIG_SYSCTL
1603 struct ctl_table *tbl;
1604
1605 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1606 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1607 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1608 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1609 kfree(tbl);
1610 #endif
1611 kfree(net->ipv4.devconf_dflt);
1612 kfree(net->ipv4.devconf_all);
1613 }
1614
1615 static __net_initdata struct pernet_operations devinet_ops = {
1616 .init = devinet_init_net,
1617 .exit = devinet_exit_net,
1618 };
1619
1620 void __init devinet_init(void)
1621 {
1622 register_pernet_subsys(&devinet_ops);
1623
1624 register_gifconf(PF_INET, inet_gifconf);
1625 register_netdevice_notifier(&ip_netdev_notifier);
1626
1627 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1628 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1629 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1630 }
1631
linux-next