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[NETLINK]: Don't BUG on undersized allocations
[linux-2.6.22.y-op.git] / net / ipv4 / devinet.c
blobc40203640966f6a95b17281ba14a38d547ba2864
1 /*
2 * NET3 IP device support routines.
3 *
4 * Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * Derived from the IP parts of dev.c 1.0.19
12 * Authors: Ross Biro
13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 *
16 * Additional Authors:
17 * Alan Cox, <gw4pts@gw4pts.ampr.org>
18 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
19 *
20 * Changes:
21 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
22 * lists.
23 * Cyrus Durgin: updated for kmod
24 * Matthias Andree: in devinet_ioctl, compare label and
25 * address (4.4BSD alias style support),
26 * fall back to comparing just the label
27 * if no match found.
28 */
29
30
31 #include <asm/uaccess.h>
32 #include <asm/system.h>
33 #include <linux/bitops.h>
34 #include <linux/capability.h>
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/kernel.h>
38 #include <linux/sched.h>
39 #include <linux/string.h>
40 #include <linux/mm.h>
41 #include <linux/socket.h>
42 #include <linux/sockios.h>
43 #include <linux/in.h>
44 #include <linux/errno.h>
45 #include <linux/interrupt.h>
46 #include <linux/if_addr.h>
47 #include <linux/if_ether.h>
48 #include <linux/inet.h>
49 #include <linux/netdevice.h>
50 #include <linux/etherdevice.h>
51 #include <linux/skbuff.h>
52 #include <linux/rtnetlink.h>
53 #include <linux/init.h>
54 #include <linux/notifier.h>
55 #include <linux/inetdevice.h>
56 #include <linux/igmp.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/kmod.h>
61
62 #include <net/arp.h>
63 #include <net/ip.h>
64 #include <net/route.h>
65 #include <net/ip_fib.h>
66 #include <net/netlink.h>
67
68 struct ipv4_devconf ipv4_devconf = {
69 .accept_redirects = 1,
70 .send_redirects = 1,
71 .secure_redirects = 1,
72 .shared_media = 1,
73 };
74
75 static struct ipv4_devconf ipv4_devconf_dflt = {
76 .accept_redirects = 1,
77 .send_redirects = 1,
78 .secure_redirects = 1,
79 .shared_media = 1,
80 .accept_source_route = 1,
81 };
82
83 static struct nla_policy ifa_ipv4_policy[IFA_MAX+1] __read_mostly = {
84 [IFA_LOCAL] = { .type = NLA_U32 },
85 [IFA_ADDRESS] = { .type = NLA_U32 },
86 [IFA_BROADCAST] = { .type = NLA_U32 },
87 [IFA_ANYCAST] = { .type = NLA_U32 },
88 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
89 };
90
91 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
92
93 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
94 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
95 int destroy);
96 #ifdef CONFIG_SYSCTL
97 static void devinet_sysctl_register(struct in_device *in_dev,
98 struct ipv4_devconf *p);
99 static void devinet_sysctl_unregister(struct ipv4_devconf *p);
100 #endif
101
102 /* Locks all the inet devices. */
103
104 static struct in_ifaddr *inet_alloc_ifa(void)
105 {
106 struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
107
108 if (ifa) {
109 INIT_RCU_HEAD(&ifa->rcu_head);
110 }
111
112 return ifa;
113 }
114
115 static void inet_rcu_free_ifa(struct rcu_head *head)
116 {
117 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
118 if (ifa->ifa_dev)
119 in_dev_put(ifa->ifa_dev);
120 kfree(ifa);
121 }
122
123 static inline void inet_free_ifa(struct in_ifaddr *ifa)
124 {
125 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
126 }
127
128 void in_dev_finish_destroy(struct in_device *idev)
129 {
130 struct net_device *dev = idev->dev;
131
132 BUG_TRAP(!idev->ifa_list);
133 BUG_TRAP(!idev->mc_list);
134 #ifdef NET_REFCNT_DEBUG
135 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
136 idev, dev ? dev->name : "NIL");
137 #endif
138 dev_put(dev);
139 if (!idev->dead)
140 printk("Freeing alive in_device %p\n", idev);
141 else {
142 kfree(idev);
143 }
144 }
145
146 struct in_device *inetdev_init(struct net_device *dev)
147 {
148 struct in_device *in_dev;
149
150 ASSERT_RTNL();
151
152 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
153 if (!in_dev)
154 goto out;
155 INIT_RCU_HEAD(&in_dev->rcu_head);
156 memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf));
157 in_dev->cnf.sysctl = NULL;
158 in_dev->dev = dev;
159 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
160 goto out_kfree;
161 /* Reference in_dev->dev */
162 dev_hold(dev);
163 #ifdef CONFIG_SYSCTL
164 neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
165 NET_IPV4_NEIGH, "ipv4", NULL, NULL);
166 #endif
167
168 /* Account for reference dev->ip_ptr (below) */
169 in_dev_hold(in_dev);
170
171 #ifdef CONFIG_SYSCTL
172 devinet_sysctl_register(in_dev, &in_dev->cnf);
173 #endif
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 if (dev == &loopback_dev)
203 return;
204
205 in_dev->dead = 1;
206
207 ip_mc_destroy_dev(in_dev);
208
209 while ((ifa = in_dev->ifa_list) != NULL) {
210 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
211 inet_free_ifa(ifa);
212 }
213
214 #ifdef CONFIG_SYSCTL
215 devinet_sysctl_unregister(&in_dev->cnf);
216 #endif
217
218 dev->ip_ptr = NULL;
219
220 #ifdef CONFIG_SYSCTL
221 neigh_sysctl_unregister(in_dev->arp_parms);
222 #endif
223 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
224 arp_ifdown(dev);
225
226 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
227 }
228
229 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
230 {
231 rcu_read_lock();
232 for_primary_ifa(in_dev) {
233 if (inet_ifa_match(a, ifa)) {
234 if (!b || inet_ifa_match(b, ifa)) {
235 rcu_read_unlock();
236 return 1;
237 }
238 }
239 } endfor_ifa(in_dev);
240 rcu_read_unlock();
241 return 0;
242 }
243
244 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
245 int destroy, struct nlmsghdr *nlh, u32 pid)
246 {
247 struct in_ifaddr *promote = NULL;
248 struct in_ifaddr *ifa, *ifa1 = *ifap;
249 struct in_ifaddr *last_prim = in_dev->ifa_list;
250 struct in_ifaddr *prev_prom = NULL;
251 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
252
253 ASSERT_RTNL();
254
255 /* 1. Deleting primary ifaddr forces deletion all secondaries
256 * unless alias promotion is set
257 **/
258
259 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
260 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
261
262 while ((ifa = *ifap1) != NULL) {
263 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
264 ifa1->ifa_scope <= ifa->ifa_scope)
265 last_prim = ifa;
266
267 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
268 ifa1->ifa_mask != ifa->ifa_mask ||
269 !inet_ifa_match(ifa1->ifa_address, ifa)) {
270 ifap1 = &ifa->ifa_next;
271 prev_prom = ifa;
272 continue;
273 }
274
275 if (!do_promote) {
276 *ifap1 = ifa->ifa_next;
277
278 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
279 blocking_notifier_call_chain(&inetaddr_chain,
280 NETDEV_DOWN, ifa);
281 inet_free_ifa(ifa);
282 } else {
283 promote = ifa;
284 break;
285 }
286 }
287 }
288
289 /* 2. Unlink it */
290
291 *ifap = ifa1->ifa_next;
292
293 /* 3. Announce address deletion */
294
295 /* Send message first, then call notifier.
296 At first sight, FIB update triggered by notifier
297 will refer to already deleted ifaddr, that could confuse
298 netlink listeners. It is not true: look, gated sees
299 that route deleted and if it still thinks that ifaddr
300 is valid, it will try to restore deleted routes... Grr.
301 So that, this order is correct.
302 */
303 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
304 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
305
306 if (promote) {
307
308 if (prev_prom) {
309 prev_prom->ifa_next = promote->ifa_next;
310 promote->ifa_next = last_prim->ifa_next;
311 last_prim->ifa_next = promote;
312 }
313
314 promote->ifa_flags &= ~IFA_F_SECONDARY;
315 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
316 blocking_notifier_call_chain(&inetaddr_chain,
317 NETDEV_UP, promote);
318 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
319 if (ifa1->ifa_mask != ifa->ifa_mask ||
320 !inet_ifa_match(ifa1->ifa_address, ifa))
321 continue;
322 fib_add_ifaddr(ifa);
323 }
324
325 }
326 if (destroy) {
327 inet_free_ifa(ifa1);
328
329 if (!in_dev->ifa_list)
330 inetdev_destroy(in_dev);
331 }
332 }
333
334 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
335 int destroy)
336 {
337 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
338 }
339
340 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
341 u32 pid)
342 {
343 struct in_device *in_dev = ifa->ifa_dev;
344 struct in_ifaddr *ifa1, **ifap, **last_primary;
345
346 ASSERT_RTNL();
347
348 if (!ifa->ifa_local) {
349 inet_free_ifa(ifa);
350 return 0;
351 }
352
353 ifa->ifa_flags &= ~IFA_F_SECONDARY;
354 last_primary = &in_dev->ifa_list;
355
356 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
357 ifap = &ifa1->ifa_next) {
358 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
359 ifa->ifa_scope <= ifa1->ifa_scope)
360 last_primary = &ifa1->ifa_next;
361 if (ifa1->ifa_mask == ifa->ifa_mask &&
362 inet_ifa_match(ifa1->ifa_address, ifa)) {
363 if (ifa1->ifa_local == ifa->ifa_local) {
364 inet_free_ifa(ifa);
365 return -EEXIST;
366 }
367 if (ifa1->ifa_scope != ifa->ifa_scope) {
368 inet_free_ifa(ifa);
369 return -EINVAL;
370 }
371 ifa->ifa_flags |= IFA_F_SECONDARY;
372 }
373 }
374
375 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
376 net_srandom(ifa->ifa_local);
377 ifap = last_primary;
378 }
379
380 ifa->ifa_next = *ifap;
381 *ifap = ifa;
382
383 /* Send message first, then call notifier.
384 Notifier will trigger FIB update, so that
385 listeners of netlink will know about new ifaddr */
386 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
387 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
388
389 return 0;
390 }
391
392 static int inet_insert_ifa(struct in_ifaddr *ifa)
393 {
394 return __inet_insert_ifa(ifa, NULL, 0);
395 }
396
397 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
398 {
399 struct in_device *in_dev = __in_dev_get_rtnl(dev);
400
401 ASSERT_RTNL();
402
403 if (!in_dev) {
404 in_dev = inetdev_init(dev);
405 if (!in_dev) {
406 inet_free_ifa(ifa);
407 return -ENOBUFS;
408 }
409 }
410 if (ifa->ifa_dev != in_dev) {
411 BUG_TRAP(!ifa->ifa_dev);
412 in_dev_hold(in_dev);
413 ifa->ifa_dev = in_dev;
414 }
415 if (LOOPBACK(ifa->ifa_local))
416 ifa->ifa_scope = RT_SCOPE_HOST;
417 return inet_insert_ifa(ifa);
418 }
419
420 struct in_device *inetdev_by_index(int ifindex)
421 {
422 struct net_device *dev;
423 struct in_device *in_dev = NULL;
424 read_lock(&dev_base_lock);
425 dev = __dev_get_by_index(ifindex);
426 if (dev)
427 in_dev = in_dev_get(dev);
428 read_unlock(&dev_base_lock);
429 return in_dev;
430 }
431
432 /* Called only from RTNL semaphored context. No locks. */
433
434 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
435 __be32 mask)
436 {
437 ASSERT_RTNL();
438
439 for_primary_ifa(in_dev) {
440 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
441 return ifa;
442 } endfor_ifa(in_dev);
443 return NULL;
444 }
445
446 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
447 {
448 struct nlattr *tb[IFA_MAX+1];
449 struct in_device *in_dev;
450 struct ifaddrmsg *ifm;
451 struct in_ifaddr *ifa, **ifap;
452 int err = -EINVAL;
453
454 ASSERT_RTNL();
455
456 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
457 if (err < 0)
458 goto errout;
459
460 ifm = nlmsg_data(nlh);
461 in_dev = inetdev_by_index(ifm->ifa_index);
462 if (in_dev == NULL) {
463 err = -ENODEV;
464 goto errout;
465 }
466
467 __in_dev_put(in_dev);
468
469 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
470 ifap = &ifa->ifa_next) {
471 if (tb[IFA_LOCAL] &&
472 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
473 continue;
474
475 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
476 continue;
477
478 if (tb[IFA_ADDRESS] &&
479 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
480 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
481 continue;
482
483 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
484 return 0;
485 }
486
487 err = -EADDRNOTAVAIL;
488 errout:
489 return err;
490 }
491
492 static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh)
493 {
494 struct nlattr *tb[IFA_MAX+1];
495 struct in_ifaddr *ifa;
496 struct ifaddrmsg *ifm;
497 struct net_device *dev;
498 struct in_device *in_dev;
499 int err = -EINVAL;
500
501 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
502 if (err < 0)
503 goto errout;
504
505 ifm = nlmsg_data(nlh);
506 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
507 goto errout;
508
509 dev = __dev_get_by_index(ifm->ifa_index);
510 if (dev == NULL) {
511 err = -ENODEV;
512 goto errout;
513 }
514
515 in_dev = __in_dev_get_rtnl(dev);
516 if (in_dev == NULL) {
517 in_dev = inetdev_init(dev);
518 if (in_dev == NULL) {
519 err = -ENOBUFS;
520 goto errout;
521 }
522 }
523
524 ifa = inet_alloc_ifa();
525 if (ifa == NULL) {
526 /*
527 * A potential indev allocation can be left alive, it stays
528 * assigned to its device and is destroy with it.
529 */
530 err = -ENOBUFS;
531 goto errout;
532 }
533
534 in_dev_hold(in_dev);
535
536 if (tb[IFA_ADDRESS] == NULL)
537 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
538
539 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
540 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
541 ifa->ifa_flags = ifm->ifa_flags;
542 ifa->ifa_scope = ifm->ifa_scope;
543 ifa->ifa_dev = in_dev;
544
545 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
546 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
547
548 if (tb[IFA_BROADCAST])
549 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
550
551 if (tb[IFA_ANYCAST])
552 ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]);
553
554 if (tb[IFA_LABEL])
555 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
556 else
557 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
558
559 return ifa;
560
561 errout:
562 return ERR_PTR(err);
563 }
564
565 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
566 {
567 struct in_ifaddr *ifa;
568
569 ASSERT_RTNL();
570
571 ifa = rtm_to_ifaddr(nlh);
572 if (IS_ERR(ifa))
573 return PTR_ERR(ifa);
574
575 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
576 }
577
578 /*
579 * Determine a default network mask, based on the IP address.
580 */
581
582 static __inline__ int inet_abc_len(__be32 addr)
583 {
584 int rc = -1; /* Something else, probably a multicast. */
585
586 if (ZERONET(addr))
587 rc = 0;
588 else {
589 __u32 haddr = ntohl(addr);
590
591 if (IN_CLASSA(haddr))
592 rc = 8;
593 else if (IN_CLASSB(haddr))
594 rc = 16;
595 else if (IN_CLASSC(haddr))
596 rc = 24;
597 }
598
599 return rc;
600 }
601
602
603 int devinet_ioctl(unsigned int cmd, void __user *arg)
604 {
605 struct ifreq ifr;
606 struct sockaddr_in sin_orig;
607 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
608 struct in_device *in_dev;
609 struct in_ifaddr **ifap = NULL;
610 struct in_ifaddr *ifa = NULL;
611 struct net_device *dev;
612 char *colon;
613 int ret = -EFAULT;
614 int tryaddrmatch = 0;
615
616 /*
617 * Fetch the caller's info block into kernel space
618 */
619
620 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
621 goto out;
622 ifr.ifr_name[IFNAMSIZ - 1] = 0;
623
624 /* save original address for comparison */
625 memcpy(&sin_orig, sin, sizeof(*sin));
626
627 colon = strchr(ifr.ifr_name, ':');
628 if (colon)
629 *colon = 0;
630
631 #ifdef CONFIG_KMOD
632 dev_load(ifr.ifr_name);
633 #endif
634
635 switch(cmd) {
636 case SIOCGIFADDR: /* Get interface address */
637 case SIOCGIFBRDADDR: /* Get the broadcast address */
638 case SIOCGIFDSTADDR: /* Get the destination address */
639 case SIOCGIFNETMASK: /* Get the netmask for the interface */
640 /* Note that these ioctls will not sleep,
641 so that we do not impose a lock.
642 One day we will be forced to put shlock here (I mean SMP)
643 */
644 tryaddrmatch = (sin_orig.sin_family == AF_INET);
645 memset(sin, 0, sizeof(*sin));
646 sin->sin_family = AF_INET;
647 break;
648
649 case SIOCSIFFLAGS:
650 ret = -EACCES;
651 if (!capable(CAP_NET_ADMIN))
652 goto out;
653 break;
654 case SIOCSIFADDR: /* Set interface address (and family) */
655 case SIOCSIFBRDADDR: /* Set the broadcast address */
656 case SIOCSIFDSTADDR: /* Set the destination address */
657 case SIOCSIFNETMASK: /* Set the netmask for the interface */
658 ret = -EACCES;
659 if (!capable(CAP_NET_ADMIN))
660 goto out;
661 ret = -EINVAL;
662 if (sin->sin_family != AF_INET)
663 goto out;
664 break;
665 default:
666 ret = -EINVAL;
667 goto out;
668 }
669
670 rtnl_lock();
671
672 ret = -ENODEV;
673 if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL)
674 goto done;
675
676 if (colon)
677 *colon = ':';
678
679 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
680 if (tryaddrmatch) {
681 /* Matthias Andree */
682 /* compare label and address (4.4BSD style) */
683 /* note: we only do this for a limited set of ioctls
684 and only if the original address family was AF_INET.
685 This is checked above. */
686 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
687 ifap = &ifa->ifa_next) {
688 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
689 sin_orig.sin_addr.s_addr ==
690 ifa->ifa_address) {
691 break; /* found */
692 }
693 }
694 }
695 /* we didn't get a match, maybe the application is
696 4.3BSD-style and passed in junk so we fall back to
697 comparing just the label */
698 if (!ifa) {
699 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
700 ifap = &ifa->ifa_next)
701 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
702 break;
703 }
704 }
705
706 ret = -EADDRNOTAVAIL;
707 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
708 goto done;
709
710 switch(cmd) {
711 case SIOCGIFADDR: /* Get interface address */
712 sin->sin_addr.s_addr = ifa->ifa_local;
713 goto rarok;
714
715 case SIOCGIFBRDADDR: /* Get the broadcast address */
716 sin->sin_addr.s_addr = ifa->ifa_broadcast;
717 goto rarok;
718
719 case SIOCGIFDSTADDR: /* Get the destination address */
720 sin->sin_addr.s_addr = ifa->ifa_address;
721 goto rarok;
722
723 case SIOCGIFNETMASK: /* Get the netmask for the interface */
724 sin->sin_addr.s_addr = ifa->ifa_mask;
725 goto rarok;
726
727 case SIOCSIFFLAGS:
728 if (colon) {
729 ret = -EADDRNOTAVAIL;
730 if (!ifa)
731 break;
732 ret = 0;
733 if (!(ifr.ifr_flags & IFF_UP))
734 inet_del_ifa(in_dev, ifap, 1);
735 break;
736 }
737 ret = dev_change_flags(dev, ifr.ifr_flags);
738 break;
739
740 case SIOCSIFADDR: /* Set interface address (and family) */
741 ret = -EINVAL;
742 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
743 break;
744
745 if (!ifa) {
746 ret = -ENOBUFS;
747 if ((ifa = inet_alloc_ifa()) == NULL)
748 break;
749 if (colon)
750 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
751 else
752 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
753 } else {
754 ret = 0;
755 if (ifa->ifa_local == sin->sin_addr.s_addr)
756 break;
757 inet_del_ifa(in_dev, ifap, 0);
758 ifa->ifa_broadcast = 0;
759 ifa->ifa_anycast = 0;
760 }
761
762 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
763
764 if (!(dev->flags & IFF_POINTOPOINT)) {
765 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
766 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
767 if ((dev->flags & IFF_BROADCAST) &&
768 ifa->ifa_prefixlen < 31)
769 ifa->ifa_broadcast = ifa->ifa_address |
770 ~ifa->ifa_mask;
771 } else {
772 ifa->ifa_prefixlen = 32;
773 ifa->ifa_mask = inet_make_mask(32);
774 }
775 ret = inet_set_ifa(dev, ifa);
776 break;
777
778 case SIOCSIFBRDADDR: /* Set the broadcast address */
779 ret = 0;
780 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
781 inet_del_ifa(in_dev, ifap, 0);
782 ifa->ifa_broadcast = sin->sin_addr.s_addr;
783 inet_insert_ifa(ifa);
784 }
785 break;
786
787 case SIOCSIFDSTADDR: /* Set the destination address */
788 ret = 0;
789 if (ifa->ifa_address == sin->sin_addr.s_addr)
790 break;
791 ret = -EINVAL;
792 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
793 break;
794 ret = 0;
795 inet_del_ifa(in_dev, ifap, 0);
796 ifa->ifa_address = sin->sin_addr.s_addr;
797 inet_insert_ifa(ifa);
798 break;
799
800 case SIOCSIFNETMASK: /* Set the netmask for the interface */
801
802 /*
803 * The mask we set must be legal.
804 */
805 ret = -EINVAL;
806 if (bad_mask(sin->sin_addr.s_addr, 0))
807 break;
808 ret = 0;
809 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
810 __be32 old_mask = ifa->ifa_mask;
811 inet_del_ifa(in_dev, ifap, 0);
812 ifa->ifa_mask = sin->sin_addr.s_addr;
813 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
814
815 /* See if current broadcast address matches
816 * with current netmask, then recalculate
817 * the broadcast address. Otherwise it's a
818 * funny address, so don't touch it since
819 * the user seems to know what (s)he's doing...
820 */
821 if ((dev->flags & IFF_BROADCAST) &&
822 (ifa->ifa_prefixlen < 31) &&
823 (ifa->ifa_broadcast ==
824 (ifa->ifa_local|~old_mask))) {
825 ifa->ifa_broadcast = (ifa->ifa_local |
826 ~sin->sin_addr.s_addr);
827 }
828 inet_insert_ifa(ifa);
829 }
830 break;
831 }
832 done:
833 rtnl_unlock();
834 out:
835 return ret;
836 rarok:
837 rtnl_unlock();
838 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
839 goto out;
840 }
841
842 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
843 {
844 struct in_device *in_dev = __in_dev_get_rtnl(dev);
845 struct in_ifaddr *ifa;
846 struct ifreq ifr;
847 int done = 0;
848
849 if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
850 goto out;
851
852 for (; ifa; ifa = ifa->ifa_next) {
853 if (!buf) {
854 done += sizeof(ifr);
855 continue;
856 }
857 if (len < (int) sizeof(ifr))
858 break;
859 memset(&ifr, 0, sizeof(struct ifreq));
860 if (ifa->ifa_label)
861 strcpy(ifr.ifr_name, ifa->ifa_label);
862 else
863 strcpy(ifr.ifr_name, dev->name);
864
865 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
866 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
867 ifa->ifa_local;
868
869 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
870 done = -EFAULT;
871 break;
872 }
873 buf += sizeof(struct ifreq);
874 len -= sizeof(struct ifreq);
875 done += sizeof(struct ifreq);
876 }
877 out:
878 return done;
879 }
880
881 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
882 {
883 __be32 addr = 0;
884 struct in_device *in_dev;
885
886 rcu_read_lock();
887 in_dev = __in_dev_get_rcu(dev);
888 if (!in_dev)
889 goto no_in_dev;
890
891 for_primary_ifa(in_dev) {
892 if (ifa->ifa_scope > scope)
893 continue;
894 if (!dst || inet_ifa_match(dst, ifa)) {
895 addr = ifa->ifa_local;
896 break;
897 }
898 if (!addr)
899 addr = ifa->ifa_local;
900 } endfor_ifa(in_dev);
901 no_in_dev:
902 rcu_read_unlock();
903
904 if (addr)
905 goto out;
906
907 /* Not loopback addresses on loopback should be preferred
908 in this case. It is importnat that lo is the first interface
909 in dev_base list.
910 */
911 read_lock(&dev_base_lock);
912 rcu_read_lock();
913 for (dev = dev_base; dev; dev = dev->next) {
914 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
915 continue;
916
917 for_primary_ifa(in_dev) {
918 if (ifa->ifa_scope != RT_SCOPE_LINK &&
919 ifa->ifa_scope <= scope) {
920 addr = ifa->ifa_local;
921 goto out_unlock_both;
922 }
923 } endfor_ifa(in_dev);
924 }
925 out_unlock_both:
926 read_unlock(&dev_base_lock);
927 rcu_read_unlock();
928 out:
929 return addr;
930 }
931
932 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
933 __be32 local, int scope)
934 {
935 int same = 0;
936 __be32 addr = 0;
937
938 for_ifa(in_dev) {
939 if (!addr &&
940 (local == ifa->ifa_local || !local) &&
941 ifa->ifa_scope <= scope) {
942 addr = ifa->ifa_local;
943 if (same)
944 break;
945 }
946 if (!same) {
947 same = (!local || inet_ifa_match(local, ifa)) &&
948 (!dst || inet_ifa_match(dst, ifa));
949 if (same && addr) {
950 if (local || !dst)
951 break;
952 /* Is the selected addr into dst subnet? */
953 if (inet_ifa_match(addr, ifa))
954 break;
955 /* No, then can we use new local src? */
956 if (ifa->ifa_scope <= scope) {
957 addr = ifa->ifa_local;
958 break;
959 }
960 /* search for large dst subnet for addr */
961 same = 0;
962 }
963 }
964 } endfor_ifa(in_dev);
965
966 return same? addr : 0;
967 }
968
969 /*
970 * Confirm that local IP address exists using wildcards:
971 * - dev: only on this interface, 0=any interface
972 * - dst: only in the same subnet as dst, 0=any dst
973 * - local: address, 0=autoselect the local address
974 * - scope: maximum allowed scope value for the local address
975 */
976 __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope)
977 {
978 __be32 addr = 0;
979 struct in_device *in_dev;
980
981 if (dev) {
982 rcu_read_lock();
983 if ((in_dev = __in_dev_get_rcu(dev)))
984 addr = confirm_addr_indev(in_dev, dst, local, scope);
985 rcu_read_unlock();
986
987 return addr;
988 }
989
990 read_lock(&dev_base_lock);
991 rcu_read_lock();
992 for (dev = dev_base; dev; dev = dev->next) {
993 if ((in_dev = __in_dev_get_rcu(dev))) {
994 addr = confirm_addr_indev(in_dev, dst, local, scope);
995 if (addr)
996 break;
997 }
998 }
999 rcu_read_unlock();
1000 read_unlock(&dev_base_lock);
1001
1002 return addr;
1003 }
1004
1005 /*
1006 * Device notifier
1007 */
1008
1009 int register_inetaddr_notifier(struct notifier_block *nb)
1010 {
1011 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1012 }
1013
1014 int unregister_inetaddr_notifier(struct notifier_block *nb)
1015 {
1016 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1017 }
1018
1019 /* Rename ifa_labels for a device name change. Make some effort to preserve existing
1020 * alias numbering and to create unique labels if possible.
1021 */
1022 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1023 {
1024 struct in_ifaddr *ifa;
1025 int named = 0;
1026
1027 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1028 char old[IFNAMSIZ], *dot;
1029
1030 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1031 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1032 if (named++ == 0)
1033 continue;
1034 dot = strchr(ifa->ifa_label, ':');
1035 if (dot == NULL) {
1036 sprintf(old, ":%d", named);
1037 dot = old;
1038 }
1039 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1040 strcat(ifa->ifa_label, dot);
1041 } else {
1042 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1043 }
1044 }
1045 }
1046
1047 /* Called only under RTNL semaphore */
1048
1049 static int inetdev_event(struct notifier_block *this, unsigned long event,
1050 void *ptr)
1051 {
1052 struct net_device *dev = ptr;
1053 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1054
1055 ASSERT_RTNL();
1056
1057 if (!in_dev) {
1058 if (event == NETDEV_REGISTER && dev == &loopback_dev) {
1059 in_dev = inetdev_init(dev);
1060 if (!in_dev)
1061 panic("devinet: Failed to create loopback\n");
1062 in_dev->cnf.no_xfrm = 1;
1063 in_dev->cnf.no_policy = 1;
1064 }
1065 goto out;
1066 }
1067
1068 switch (event) {
1069 case NETDEV_REGISTER:
1070 printk(KERN_DEBUG "inetdev_event: bug\n");
1071 dev->ip_ptr = NULL;
1072 break;
1073 case NETDEV_UP:
1074 if (dev->mtu < 68)
1075 break;
1076 if (dev == &loopback_dev) {
1077 struct in_ifaddr *ifa;
1078 if ((ifa = inet_alloc_ifa()) != NULL) {
1079 ifa->ifa_local =
1080 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1081 ifa->ifa_prefixlen = 8;
1082 ifa->ifa_mask = inet_make_mask(8);
1083 in_dev_hold(in_dev);
1084 ifa->ifa_dev = in_dev;
1085 ifa->ifa_scope = RT_SCOPE_HOST;
1086 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1087 inet_insert_ifa(ifa);
1088 }
1089 }
1090 ip_mc_up(in_dev);
1091 break;
1092 case NETDEV_DOWN:
1093 ip_mc_down(in_dev);
1094 break;
1095 case NETDEV_CHANGEMTU:
1096 if (dev->mtu >= 68)
1097 break;
1098 /* MTU falled under 68, disable IP */
1099 case NETDEV_UNREGISTER:
1100 inetdev_destroy(in_dev);
1101 break;
1102 case NETDEV_CHANGENAME:
1103 /* Do not notify about label change, this event is
1104 * not interesting to applications using netlink.
1105 */
1106 inetdev_changename(dev, in_dev);
1107
1108 #ifdef CONFIG_SYSCTL
1109 devinet_sysctl_unregister(&in_dev->cnf);
1110 neigh_sysctl_unregister(in_dev->arp_parms);
1111 neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
1112 NET_IPV4_NEIGH, "ipv4", NULL, NULL);
1113 devinet_sysctl_register(in_dev, &in_dev->cnf);
1114 #endif
1115 break;
1116 }
1117 out:
1118 return NOTIFY_DONE;
1119 }
1120
1121 static struct notifier_block ip_netdev_notifier = {
1122 .notifier_call =inetdev_event,
1123 };
1124
1125 static inline size_t inet_nlmsg_size(void)
1126 {
1127 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1128 + nla_total_size(4) /* IFA_ADDRESS */
1129 + nla_total_size(4) /* IFA_LOCAL */
1130 + nla_total_size(4) /* IFA_BROADCAST */
1131 + nla_total_size(4) /* IFA_ANYCAST */
1132 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1133 }
1134
1135 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1136 u32 pid, u32 seq, int event, unsigned int flags)
1137 {
1138 struct ifaddrmsg *ifm;
1139 struct nlmsghdr *nlh;
1140
1141 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1142 if (nlh == NULL)
1143 return -EMSGSIZE;
1144
1145 ifm = nlmsg_data(nlh);
1146 ifm->ifa_family = AF_INET;
1147 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1148 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1149 ifm->ifa_scope = ifa->ifa_scope;
1150 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1151
1152 if (ifa->ifa_address)
1153 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1154
1155 if (ifa->ifa_local)
1156 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1157
1158 if (ifa->ifa_broadcast)
1159 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1160
1161 if (ifa->ifa_anycast)
1162 NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast);
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
1169 nla_put_failure:
1170 nlmsg_cancel(skb, nlh);
1171 return -EMSGSIZE;
1172 }
1173
1174 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1175 {
1176 int idx, ip_idx;
1177 struct net_device *dev;
1178 struct in_device *in_dev;
1179 struct in_ifaddr *ifa;
1180 int s_ip_idx, s_idx = cb->args[0];
1181
1182 s_ip_idx = ip_idx = cb->args[1];
1183 read_lock(&dev_base_lock);
1184 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
1185 if (idx < s_idx)
1186 continue;
1187 if (idx > s_idx)
1188 s_ip_idx = 0;
1189 rcu_read_lock();
1190 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
1191 rcu_read_unlock();
1192 continue;
1193 }
1194
1195 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1196 ifa = ifa->ifa_next, ip_idx++) {
1197 if (ip_idx < s_ip_idx)
1198 continue;
1199 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1200 cb->nlh->nlmsg_seq,
1201 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1202 rcu_read_unlock();
1203 goto done;
1204 }
1205 }
1206 rcu_read_unlock();
1207 }
1208
1209 done:
1210 read_unlock(&dev_base_lock);
1211 cb->args[0] = idx;
1212 cb->args[1] = ip_idx;
1213
1214 return skb->len;
1215 }
1216
1217 static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
1218 u32 pid)
1219 {
1220 struct sk_buff *skb;
1221 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1222 int err = -ENOBUFS;
1223
1224 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1225 if (skb == NULL)
1226 goto errout;
1227
1228 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1229 if (err < 0) {
1230 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1231 WARN_ON(err == -EMSGSIZE);
1232 kfree_skb(skb);
1233 goto errout;
1234 }
1235 err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1236 errout:
1237 if (err < 0)
1238 rtnl_set_sk_err(RTNLGRP_IPV4_IFADDR, err);
1239 }
1240
1241 static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = {
1242 [RTM_NEWADDR - RTM_BASE] = { .doit = inet_rtm_newaddr, },
1243 [RTM_DELADDR - RTM_BASE] = { .doit = inet_rtm_deladdr, },
1244 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet_dump_ifaddr, },
1245 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet_rtm_newroute, },
1246 [RTM_DELROUTE - RTM_BASE] = { .doit = inet_rtm_delroute, },
1247 [RTM_GETROUTE - RTM_BASE] = { .doit = inet_rtm_getroute,
1248 .dumpit = inet_dump_fib, },
1249 #ifdef CONFIG_IP_MULTIPLE_TABLES
1250 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib4_rules_dump, },
1251 #endif
1252 };
1253
1254 #ifdef CONFIG_SYSCTL
1255
1256 void inet_forward_change(void)
1257 {
1258 struct net_device *dev;
1259 int on = ipv4_devconf.forwarding;
1260
1261 ipv4_devconf.accept_redirects = !on;
1262 ipv4_devconf_dflt.forwarding = on;
1263
1264 read_lock(&dev_base_lock);
1265 for (dev = dev_base; dev; dev = dev->next) {
1266 struct in_device *in_dev;
1267 rcu_read_lock();
1268 in_dev = __in_dev_get_rcu(dev);
1269 if (in_dev)
1270 in_dev->cnf.forwarding = on;
1271 rcu_read_unlock();
1272 }
1273 read_unlock(&dev_base_lock);
1274
1275 rt_cache_flush(0);
1276 }
1277
1278 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1279 struct file* filp, void __user *buffer,
1280 size_t *lenp, loff_t *ppos)
1281 {
1282 int *valp = ctl->data;
1283 int val = *valp;
1284 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1285
1286 if (write && *valp != val) {
1287 if (valp == &ipv4_devconf.forwarding)
1288 inet_forward_change();
1289 else if (valp != &ipv4_devconf_dflt.forwarding)
1290 rt_cache_flush(0);
1291 }
1292
1293 return ret;
1294 }
1295
1296 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1297 struct file* filp, void __user *buffer,
1298 size_t *lenp, loff_t *ppos)
1299 {
1300 int *valp = ctl->data;
1301 int val = *valp;
1302 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1303
1304 if (write && *valp != val)
1305 rt_cache_flush(0);
1306
1307 return ret;
1308 }
1309
1310 int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
1311 void __user *oldval, size_t __user *oldlenp,
1312 void __user *newval, size_t newlen)
1313 {
1314 int *valp = table->data;
1315 int new;
1316
1317 if (!newval || !newlen)
1318 return 0;
1319
1320 if (newlen != sizeof(int))
1321 return -EINVAL;
1322
1323 if (get_user(new, (int __user *)newval))
1324 return -EFAULT;
1325
1326 if (new == *valp)
1327 return 0;
1328
1329 if (oldval && oldlenp) {
1330 size_t len;
1331
1332 if (get_user(len, oldlenp))
1333 return -EFAULT;
1334
1335 if (len) {
1336 if (len > table->maxlen)
1337 len = table->maxlen;
1338 if (copy_to_user(oldval, valp, len))
1339 return -EFAULT;
1340 if (put_user(len, oldlenp))
1341 return -EFAULT;
1342 }
1343 }
1344
1345 *valp = new;
1346 rt_cache_flush(0);
1347 return 1;
1348 }
1349
1350
1351 static struct devinet_sysctl_table {
1352 struct ctl_table_header *sysctl_header;
1353 ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
1354 ctl_table devinet_dev[2];
1355 ctl_table devinet_conf_dir[2];
1356 ctl_table devinet_proto_dir[2];
1357 ctl_table devinet_root_dir[2];
1358 } devinet_sysctl = {
1359 .devinet_vars = {
1360 {
1361 .ctl_name = NET_IPV4_CONF_FORWARDING,
1362 .procname = "forwarding",
1363 .data = &ipv4_devconf.forwarding,
1364 .maxlen = sizeof(int),
1365 .mode = 0644,
1366 .proc_handler = &devinet_sysctl_forward,
1367 },
1368 {
1369 .ctl_name = NET_IPV4_CONF_MC_FORWARDING,
1370 .procname = "mc_forwarding",
1371 .data = &ipv4_devconf.mc_forwarding,
1372 .maxlen = sizeof(int),
1373 .mode = 0444,
1374 .proc_handler = &proc_dointvec,
1375 },
1376 {
1377 .ctl_name = NET_IPV4_CONF_ACCEPT_REDIRECTS,
1378 .procname = "accept_redirects",
1379 .data = &ipv4_devconf.accept_redirects,
1380 .maxlen = sizeof(int),
1381 .mode = 0644,
1382 .proc_handler = &proc_dointvec,
1383 },
1384 {
1385 .ctl_name = NET_IPV4_CONF_SECURE_REDIRECTS,
1386 .procname = "secure_redirects",
1387 .data = &ipv4_devconf.secure_redirects,
1388 .maxlen = sizeof(int),
1389 .mode = 0644,
1390 .proc_handler = &proc_dointvec,
1391 },
1392 {
1393 .ctl_name = NET_IPV4_CONF_SHARED_MEDIA,
1394 .procname = "shared_media",
1395 .data = &ipv4_devconf.shared_media,
1396 .maxlen = sizeof(int),
1397 .mode = 0644,
1398 .proc_handler = &proc_dointvec,
1399 },
1400 {
1401 .ctl_name = NET_IPV4_CONF_RP_FILTER,
1402 .procname = "rp_filter",
1403 .data = &ipv4_devconf.rp_filter,
1404 .maxlen = sizeof(int),
1405 .mode = 0644,
1406 .proc_handler = &proc_dointvec,
1407 },
1408 {
1409 .ctl_name = NET_IPV4_CONF_SEND_REDIRECTS,
1410 .procname = "send_redirects",
1411 .data = &ipv4_devconf.send_redirects,
1412 .maxlen = sizeof(int),
1413 .mode = 0644,
1414 .proc_handler = &proc_dointvec,
1415 },
1416 {
1417 .ctl_name = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE,
1418 .procname = "accept_source_route",
1419 .data = &ipv4_devconf.accept_source_route,
1420 .maxlen = sizeof(int),
1421 .mode = 0644,
1422 .proc_handler = &proc_dointvec,
1423 },
1424 {
1425 .ctl_name = NET_IPV4_CONF_PROXY_ARP,
1426 .procname = "proxy_arp",
1427 .data = &ipv4_devconf.proxy_arp,
1428 .maxlen = sizeof(int),
1429 .mode = 0644,
1430 .proc_handler = &proc_dointvec,
1431 },
1432 {
1433 .ctl_name = NET_IPV4_CONF_MEDIUM_ID,
1434 .procname = "medium_id",
1435 .data = &ipv4_devconf.medium_id,
1436 .maxlen = sizeof(int),
1437 .mode = 0644,
1438 .proc_handler = &proc_dointvec,
1439 },
1440 {
1441 .ctl_name = NET_IPV4_CONF_BOOTP_RELAY,
1442 .procname = "bootp_relay",
1443 .data = &ipv4_devconf.bootp_relay,
1444 .maxlen = sizeof(int),
1445 .mode = 0644,
1446 .proc_handler = &proc_dointvec,
1447 },
1448 {
1449 .ctl_name = NET_IPV4_CONF_LOG_MARTIANS,
1450 .procname = "log_martians",
1451 .data = &ipv4_devconf.log_martians,
1452 .maxlen = sizeof(int),
1453 .mode = 0644,
1454 .proc_handler = &proc_dointvec,
1455 },
1456 {
1457 .ctl_name = NET_IPV4_CONF_TAG,
1458 .procname = "tag",
1459 .data = &ipv4_devconf.tag,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
1462 .proc_handler = &proc_dointvec,
1463 },
1464 {
1465 .ctl_name = NET_IPV4_CONF_ARPFILTER,
1466 .procname = "arp_filter",
1467 .data = &ipv4_devconf.arp_filter,
1468 .maxlen = sizeof(int),
1469 .mode = 0644,
1470 .proc_handler = &proc_dointvec,
1471 },
1472 {
1473 .ctl_name = NET_IPV4_CONF_ARP_ANNOUNCE,
1474 .procname = "arp_announce",
1475 .data = &ipv4_devconf.arp_announce,
1476 .maxlen = sizeof(int),
1477 .mode = 0644,
1478 .proc_handler = &proc_dointvec,
1479 },
1480 {
1481 .ctl_name = NET_IPV4_CONF_ARP_IGNORE,
1482 .procname = "arp_ignore",
1483 .data = &ipv4_devconf.arp_ignore,
1484 .maxlen = sizeof(int),
1485 .mode = 0644,
1486 .proc_handler = &proc_dointvec,
1487 },
1488 {
1489 .ctl_name = NET_IPV4_CONF_ARP_ACCEPT,
1490 .procname = "arp_accept",
1491 .data = &ipv4_devconf.arp_accept,
1492 .maxlen = sizeof(int),
1493 .mode = 0644,
1494 .proc_handler = &proc_dointvec,
1495 },
1496 {
1497 .ctl_name = NET_IPV4_CONF_NOXFRM,
1498 .procname = "disable_xfrm",
1499 .data = &ipv4_devconf.no_xfrm,
1500 .maxlen = sizeof(int),
1501 .mode = 0644,
1502 .proc_handler = &ipv4_doint_and_flush,
1503 .strategy = &ipv4_doint_and_flush_strategy,
1504 },
1505 {
1506 .ctl_name = NET_IPV4_CONF_NOPOLICY,
1507 .procname = "disable_policy",
1508 .data = &ipv4_devconf.no_policy,
1509 .maxlen = sizeof(int),
1510 .mode = 0644,
1511 .proc_handler = &ipv4_doint_and_flush,
1512 .strategy = &ipv4_doint_and_flush_strategy,
1513 },
1514 {
1515 .ctl_name = NET_IPV4_CONF_FORCE_IGMP_VERSION,
1516 .procname = "force_igmp_version",
1517 .data = &ipv4_devconf.force_igmp_version,
1518 .maxlen = sizeof(int),
1519 .mode = 0644,
1520 .proc_handler = &ipv4_doint_and_flush,
1521 .strategy = &ipv4_doint_and_flush_strategy,
1522 },
1523 {
1524 .ctl_name = NET_IPV4_CONF_PROMOTE_SECONDARIES,
1525 .procname = "promote_secondaries",
1526 .data = &ipv4_devconf.promote_secondaries,
1527 .maxlen = sizeof(int),
1528 .mode = 0644,
1529 .proc_handler = &ipv4_doint_and_flush,
1530 .strategy = &ipv4_doint_and_flush_strategy,
1531 },
1532 },
1533 .devinet_dev = {
1534 {
1535 .ctl_name = NET_PROTO_CONF_ALL,
1536 .procname = "all",
1537 .mode = 0555,
1538 .child = devinet_sysctl.devinet_vars,
1539 },
1540 },
1541 .devinet_conf_dir = {
1542 {
1543 .ctl_name = NET_IPV4_CONF,
1544 .procname = "conf",
1545 .mode = 0555,
1546 .child = devinet_sysctl.devinet_dev,
1547 },
1548 },
1549 .devinet_proto_dir = {
1550 {
1551 .ctl_name = NET_IPV4,
1552 .procname = "ipv4",
1553 .mode = 0555,
1554 .child = devinet_sysctl.devinet_conf_dir,
1555 },
1556 },
1557 .devinet_root_dir = {
1558 {
1559 .ctl_name = CTL_NET,
1560 .procname = "net",
1561 .mode = 0555,
1562 .child = devinet_sysctl.devinet_proto_dir,
1563 },
1564 },
1565 };
1566
1567 static void devinet_sysctl_register(struct in_device *in_dev,
1568 struct ipv4_devconf *p)
1569 {
1570 int i;
1571 struct net_device *dev = in_dev ? in_dev->dev : NULL;
1572 struct devinet_sysctl_table *t = kmemdup(&devinet_sysctl, sizeof(*t),
1573 GFP_KERNEL);
1574 char *dev_name = NULL;
1575
1576 if (!t)
1577 return;
1578 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1579 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1580 t->devinet_vars[i].de = NULL;
1581 }
1582
1583 if (dev) {
1584 dev_name = dev->name;
1585 t->devinet_dev[0].ctl_name = dev->ifindex;
1586 } else {
1587 dev_name = "default";
1588 t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
1589 }
1590
1591 /*
1592 * Make a copy of dev_name, because '.procname' is regarded as const
1593 * by sysctl and we wouldn't want anyone to change it under our feet
1594 * (see SIOCSIFNAME).
1595 */
1596 dev_name = kstrdup(dev_name, GFP_KERNEL);
1597 if (!dev_name)
1598 goto free;
1599
1600 t->devinet_dev[0].procname = dev_name;
1601 t->devinet_dev[0].child = t->devinet_vars;
1602 t->devinet_dev[0].de = NULL;
1603 t->devinet_conf_dir[0].child = t->devinet_dev;
1604 t->devinet_conf_dir[0].de = NULL;
1605 t->devinet_proto_dir[0].child = t->devinet_conf_dir;
1606 t->devinet_proto_dir[0].de = NULL;
1607 t->devinet_root_dir[0].child = t->devinet_proto_dir;
1608 t->devinet_root_dir[0].de = NULL;
1609
1610 t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0);
1611 if (!t->sysctl_header)
1612 goto free_procname;
1613
1614 p->sysctl = t;
1615 return;
1616
1617 /* error path */
1618 free_procname:
1619 kfree(dev_name);
1620 free:
1621 kfree(t);
1622 return;
1623 }
1624
1625 static void devinet_sysctl_unregister(struct ipv4_devconf *p)
1626 {
1627 if (p->sysctl) {
1628 struct devinet_sysctl_table *t = p->sysctl;
1629 p->sysctl = NULL;
1630 unregister_sysctl_table(t->sysctl_header);
1631 kfree(t->devinet_dev[0].procname);
1632 kfree(t);
1633 }
1634 }
1635 #endif
1636
1637 void __init devinet_init(void)
1638 {
1639 register_gifconf(PF_INET, inet_gifconf);
1640 register_netdevice_notifier(&ip_netdev_notifier);
1641 rtnetlink_links[PF_INET] = inet_rtnetlink_table;
1642 #ifdef CONFIG_SYSCTL
1643 devinet_sysctl.sysctl_header =
1644 register_sysctl_table(devinet_sysctl.devinet_root_dir, 0);
1645 devinet_sysctl_register(NULL, &ipv4_devconf_dflt);
1646 #endif
1647 }
1648
1649 EXPORT_SYMBOL(in_dev_finish_destroy);
1650 EXPORT_SYMBOL(inet_select_addr);
1651 EXPORT_SYMBOL(inetdev_by_index);
1652 EXPORT_SYMBOL(register_inetaddr_notifier);
1653 EXPORT_SYMBOL(unregister_inetaddr_notifier);
linux v2.6.22.y-op