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Merge master.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6
[deliverable/linux.git] / net / ipv4 / devinet.c
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/string.h>
39 #include <linux/mm.h>
40 #include <linux/socket.h>
41 #include <linux/sockios.h>
42 #include <linux/in.h>
43 #include <linux/errno.h>
44 #include <linux/interrupt.h>
45 #include <linux/if_addr.h>
46 #include <linux/if_ether.h>
47 #include <linux/inet.h>
48 #include <linux/netdevice.h>
49 #include <linux/etherdevice.h>
50 #include <linux/skbuff.h>
51 #include <linux/rtnetlink.h>
52 #include <linux/init.h>
53 #include <linux/notifier.h>
54 #include <linux/inetdevice.h>
55 #include <linux/igmp.h>
56 #ifdef CONFIG_SYSCTL
57 #include <linux/sysctl.h>
58 #endif
59 #include <linux/kmod.h>
60
61 #include <net/arp.h>
62 #include <net/ip.h>
63 #include <net/route.h>
64 #include <net/ip_fib.h>
65 #include <net/netlink.h>
66
67 struct ipv4_devconf ipv4_devconf = {
68 .accept_redirects = 1,
69 .send_redirects = 1,
70 .secure_redirects = 1,
71 .shared_media = 1,
72 };
73
74 static struct ipv4_devconf ipv4_devconf_dflt = {
75 .accept_redirects = 1,
76 .send_redirects = 1,
77 .secure_redirects = 1,
78 .shared_media = 1,
79 .accept_source_route = 1,
80 };
81
82 static struct nla_policy ifa_ipv4_policy[IFA_MAX+1] __read_mostly = {
83 [IFA_LOCAL] = { .type = NLA_U32 },
84 [IFA_ADDRESS] = { .type = NLA_U32 },
85 [IFA_BROADCAST] = { .type = NLA_U32 },
86 [IFA_ANYCAST] = { .type = NLA_U32 },
87 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
88 };
89
90 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
91
92 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
93 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
94 int destroy);
95 #ifdef CONFIG_SYSCTL
96 static void devinet_sysctl_register(struct in_device *in_dev,
97 struct ipv4_devconf *p);
98 static void devinet_sysctl_unregister(struct ipv4_devconf *p);
99 #endif
100
101 /* Locks all the inet devices. */
102
103 static struct in_ifaddr *inet_alloc_ifa(void)
104 {
105 struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
106
107 if (ifa) {
108 INIT_RCU_HEAD(&ifa->rcu_head);
109 }
110
111 return ifa;
112 }
113
114 static void inet_rcu_free_ifa(struct rcu_head *head)
115 {
116 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
117 if (ifa->ifa_dev)
118 in_dev_put(ifa->ifa_dev);
119 kfree(ifa);
120 }
121
122 static inline void inet_free_ifa(struct in_ifaddr *ifa)
123 {
124 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
125 }
126
127 void in_dev_finish_destroy(struct in_device *idev)
128 {
129 struct net_device *dev = idev->dev;
130
131 BUG_TRAP(!idev->ifa_list);
132 BUG_TRAP(!idev->mc_list);
133 #ifdef NET_REFCNT_DEBUG
134 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
135 idev, dev ? dev->name : "NIL");
136 #endif
137 dev_put(dev);
138 if (!idev->dead)
139 printk("Freeing alive in_device %p\n", idev);
140 else {
141 kfree(idev);
142 }
143 }
144
145 struct in_device *inetdev_init(struct net_device *dev)
146 {
147 struct in_device *in_dev;
148
149 ASSERT_RTNL();
150
151 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
152 if (!in_dev)
153 goto out;
154 INIT_RCU_HEAD(&in_dev->rcu_head);
155 memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf));
156 in_dev->cnf.sysctl = NULL;
157 in_dev->dev = dev;
158 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
159 goto out_kfree;
160 /* Reference in_dev->dev */
161 dev_hold(dev);
162 #ifdef CONFIG_SYSCTL
163 neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
164 NET_IPV4_NEIGH, "ipv4", NULL, NULL);
165 #endif
166
167 /* Account for reference dev->ip_ptr (below) */
168 in_dev_hold(in_dev);
169
170 #ifdef CONFIG_SYSCTL
171 devinet_sysctl_register(in_dev, &in_dev->cnf);
172 #endif
173 ip_mc_init_dev(in_dev);
174 if (dev->flags & IFF_UP)
175 ip_mc_up(in_dev);
176
177 /* we can receive as soon as ip_ptr is set -- do this last */
178 rcu_assign_pointer(dev->ip_ptr, in_dev);
179 out:
180 return in_dev;
181 out_kfree:
182 kfree(in_dev);
183 in_dev = NULL;
184 goto out;
185 }
186
187 static 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
193 static 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 if (dev == &loopback_dev)
202 return;
203
204 in_dev->dead = 1;
205
206 ip_mc_destroy_dev(in_dev);
207
208 while ((ifa = in_dev->ifa_list) != NULL) {
209 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
210 inet_free_ifa(ifa);
211 }
212
213 #ifdef CONFIG_SYSCTL
214 devinet_sysctl_unregister(&in_dev->cnf);
215 #endif
216
217 dev->ip_ptr = NULL;
218
219 #ifdef CONFIG_SYSCTL
220 neigh_sysctl_unregister(in_dev->arp_parms);
221 #endif
222 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
223 arp_ifdown(dev);
224
225 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
226 }
227
228 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
229 {
230 rcu_read_lock();
231 for_primary_ifa(in_dev) {
232 if (inet_ifa_match(a, ifa)) {
233 if (!b || inet_ifa_match(b, ifa)) {
234 rcu_read_unlock();
235 return 1;
236 }
237 }
238 } endfor_ifa(in_dev);
239 rcu_read_unlock();
240 return 0;
241 }
242
243 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
244 int destroy, struct nlmsghdr *nlh, u32 pid)
245 {
246 struct in_ifaddr *promote = NULL;
247 struct in_ifaddr *ifa, *ifa1 = *ifap;
248 struct in_ifaddr *last_prim = in_dev->ifa_list;
249 struct in_ifaddr *prev_prom = NULL;
250 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
251
252 ASSERT_RTNL();
253
254 /* 1. Deleting primary ifaddr forces deletion all secondaries
255 * unless alias promotion is set
256 **/
257
258 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
259 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
260
261 while ((ifa = *ifap1) != NULL) {
262 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
263 ifa1->ifa_scope <= ifa->ifa_scope)
264 last_prim = ifa;
265
266 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
267 ifa1->ifa_mask != ifa->ifa_mask ||
268 !inet_ifa_match(ifa1->ifa_address, ifa)) {
269 ifap1 = &ifa->ifa_next;
270 prev_prom = ifa;
271 continue;
272 }
273
274 if (!do_promote) {
275 *ifap1 = ifa->ifa_next;
276
277 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
278 blocking_notifier_call_chain(&inetaddr_chain,
279 NETDEV_DOWN, ifa);
280 inet_free_ifa(ifa);
281 } else {
282 promote = ifa;
283 break;
284 }
285 }
286 }
287
288 /* 2. Unlink it */
289
290 *ifap = ifa1->ifa_next;
291
292 /* 3. Announce address deletion */
293
294 /* Send message first, then call notifier.
295 At first sight, FIB update triggered by notifier
296 will refer to already deleted ifaddr, that could confuse
297 netlink listeners. It is not true: look, gated sees
298 that route deleted and if it still thinks that ifaddr
299 is valid, it will try to restore deleted routes... Grr.
300 So that, this order is correct.
301 */
302 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
303 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
304
305 if (promote) {
306
307 if (prev_prom) {
308 prev_prom->ifa_next = promote->ifa_next;
309 promote->ifa_next = last_prim->ifa_next;
310 last_prim->ifa_next = promote;
311 }
312
313 promote->ifa_flags &= ~IFA_F_SECONDARY;
314 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
315 blocking_notifier_call_chain(&inetaddr_chain,
316 NETDEV_UP, promote);
317 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
318 if (ifa1->ifa_mask != ifa->ifa_mask ||
319 !inet_ifa_match(ifa1->ifa_address, ifa))
320 continue;
321 fib_add_ifaddr(ifa);
322 }
323
324 }
325 if (destroy) {
326 inet_free_ifa(ifa1);
327
328 if (!in_dev->ifa_list)
329 inetdev_destroy(in_dev);
330 }
331 }
332
333 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
334 int destroy)
335 {
336 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
337 }
338
339 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
340 u32 pid)
341 {
342 struct in_device *in_dev = ifa->ifa_dev;
343 struct in_ifaddr *ifa1, **ifap, **last_primary;
344
345 ASSERT_RTNL();
346
347 if (!ifa->ifa_local) {
348 inet_free_ifa(ifa);
349 return 0;
350 }
351
352 ifa->ifa_flags &= ~IFA_F_SECONDARY;
353 last_primary = &in_dev->ifa_list;
354
355 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
356 ifap = &ifa1->ifa_next) {
357 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
358 ifa->ifa_scope <= ifa1->ifa_scope)
359 last_primary = &ifa1->ifa_next;
360 if (ifa1->ifa_mask == ifa->ifa_mask &&
361 inet_ifa_match(ifa1->ifa_address, ifa)) {
362 if (ifa1->ifa_local == ifa->ifa_local) {
363 inet_free_ifa(ifa);
364 return -EEXIST;
365 }
366 if (ifa1->ifa_scope != ifa->ifa_scope) {
367 inet_free_ifa(ifa);
368 return -EINVAL;
369 }
370 ifa->ifa_flags |= IFA_F_SECONDARY;
371 }
372 }
373
374 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
375 net_srandom(ifa->ifa_local);
376 ifap = last_primary;
377 }
378
379 ifa->ifa_next = *ifap;
380 *ifap = ifa;
381
382 /* Send message first, then call notifier.
383 Notifier will trigger FIB update, so that
384 listeners of netlink will know about new ifaddr */
385 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
386 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
387
388 return 0;
389 }
390
391 static int inet_insert_ifa(struct in_ifaddr *ifa)
392 {
393 return __inet_insert_ifa(ifa, NULL, 0);
394 }
395
396 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
397 {
398 struct in_device *in_dev = __in_dev_get_rtnl(dev);
399
400 ASSERT_RTNL();
401
402 if (!in_dev) {
403 in_dev = inetdev_init(dev);
404 if (!in_dev) {
405 inet_free_ifa(ifa);
406 return -ENOBUFS;
407 }
408 }
409 if (ifa->ifa_dev != in_dev) {
410 BUG_TRAP(!ifa->ifa_dev);
411 in_dev_hold(in_dev);
412 ifa->ifa_dev = in_dev;
413 }
414 if (LOOPBACK(ifa->ifa_local))
415 ifa->ifa_scope = RT_SCOPE_HOST;
416 return inet_insert_ifa(ifa);
417 }
418
419 struct in_device *inetdev_by_index(int ifindex)
420 {
421 struct net_device *dev;
422 struct in_device *in_dev = NULL;
423 read_lock(&dev_base_lock);
424 dev = __dev_get_by_index(ifindex);
425 if (dev)
426 in_dev = in_dev_get(dev);
427 read_unlock(&dev_base_lock);
428 return in_dev;
429 }
430
431 /* Called only from RTNL semaphored context. No locks. */
432
433 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
434 __be32 mask)
435 {
436 ASSERT_RTNL();
437
438 for_primary_ifa(in_dev) {
439 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
440 return ifa;
441 } endfor_ifa(in_dev);
442 return NULL;
443 }
444
445 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
446 {
447 struct nlattr *tb[IFA_MAX+1];
448 struct in_device *in_dev;
449 struct ifaddrmsg *ifm;
450 struct in_ifaddr *ifa, **ifap;
451 int err = -EINVAL;
452
453 ASSERT_RTNL();
454
455 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
456 if (err < 0)
457 goto errout;
458
459 ifm = nlmsg_data(nlh);
460 in_dev = inetdev_by_index(ifm->ifa_index);
461 if (in_dev == NULL) {
462 err = -ENODEV;
463 goto errout;
464 }
465
466 __in_dev_put(in_dev);
467
468 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
469 ifap = &ifa->ifa_next) {
470 if (tb[IFA_LOCAL] &&
471 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
472 continue;
473
474 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
475 continue;
476
477 if (tb[IFA_ADDRESS] &&
478 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
479 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
480 continue;
481
482 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
483 return 0;
484 }
485
486 err = -EADDRNOTAVAIL;
487 errout:
488 return err;
489 }
490
491 static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh)
492 {
493 struct nlattr *tb[IFA_MAX+1];
494 struct in_ifaddr *ifa;
495 struct ifaddrmsg *ifm;
496 struct net_device *dev;
497 struct in_device *in_dev;
498 int err = -EINVAL;
499
500 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
501 if (err < 0)
502 goto errout;
503
504 ifm = nlmsg_data(nlh);
505 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
506 goto errout;
507
508 dev = __dev_get_by_index(ifm->ifa_index);
509 if (dev == NULL) {
510 err = -ENODEV;
511 goto errout;
512 }
513
514 in_dev = __in_dev_get_rtnl(dev);
515 if (in_dev == NULL) {
516 in_dev = inetdev_init(dev);
517 if (in_dev == NULL) {
518 err = -ENOBUFS;
519 goto errout;
520 }
521 }
522
523 ifa = inet_alloc_ifa();
524 if (ifa == NULL) {
525 /*
526 * A potential indev allocation can be left alive, it stays
527 * assigned to its device and is destroy with it.
528 */
529 err = -ENOBUFS;
530 goto errout;
531 }
532
533 in_dev_hold(in_dev);
534
535 if (tb[IFA_ADDRESS] == NULL)
536 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
537
538 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
539 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
540 ifa->ifa_flags = ifm->ifa_flags;
541 ifa->ifa_scope = ifm->ifa_scope;
542 ifa->ifa_dev = in_dev;
543
544 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
545 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
546
547 if (tb[IFA_BROADCAST])
548 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
549
550 if (tb[IFA_ANYCAST])
551 ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]);
552
553 if (tb[IFA_LABEL])
554 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
555 else
556 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
557
558 return ifa;
559
560 errout:
561 return ERR_PTR(err);
562 }
563
564 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
565 {
566 struct in_ifaddr *ifa;
567
568 ASSERT_RTNL();
569
570 ifa = rtm_to_ifaddr(nlh);
571 if (IS_ERR(ifa))
572 return PTR_ERR(ifa);
573
574 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
575 }
576
577 /*
578 * Determine a default network mask, based on the IP address.
579 */
580
581 static __inline__ int inet_abc_len(__be32 addr)
582 {
583 int rc = -1; /* Something else, probably a multicast. */
584
585 if (ZERONET(addr))
586 rc = 0;
587 else {
588 __u32 haddr = ntohl(addr);
589
590 if (IN_CLASSA(haddr))
591 rc = 8;
592 else if (IN_CLASSB(haddr))
593 rc = 16;
594 else if (IN_CLASSC(haddr))
595 rc = 24;
596 }
597
598 return rc;
599 }
600
601
602 int devinet_ioctl(unsigned int cmd, void __user *arg)
603 {
604 struct ifreq ifr;
605 struct sockaddr_in sin_orig;
606 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
607 struct in_device *in_dev;
608 struct in_ifaddr **ifap = NULL;
609 struct in_ifaddr *ifa = NULL;
610 struct net_device *dev;
611 char *colon;
612 int ret = -EFAULT;
613 int tryaddrmatch = 0;
614
615 /*
616 * Fetch the caller's info block into kernel space
617 */
618
619 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
620 goto out;
621 ifr.ifr_name[IFNAMSIZ - 1] = 0;
622
623 /* save original address for comparison */
624 memcpy(&sin_orig, sin, sizeof(*sin));
625
626 colon = strchr(ifr.ifr_name, ':');
627 if (colon)
628 *colon = 0;
629
630 #ifdef CONFIG_KMOD
631 dev_load(ifr.ifr_name);
632 #endif
633
634 switch(cmd) {
635 case SIOCGIFADDR: /* Get interface address */
636 case SIOCGIFBRDADDR: /* Get the broadcast address */
637 case SIOCGIFDSTADDR: /* Get the destination address */
638 case SIOCGIFNETMASK: /* Get the netmask for the interface */
639 /* Note that these ioctls will not sleep,
640 so that we do not impose a lock.
641 One day we will be forced to put shlock here (I mean SMP)
642 */
643 tryaddrmatch = (sin_orig.sin_family == AF_INET);
644 memset(sin, 0, sizeof(*sin));
645 sin->sin_family = AF_INET;
646 break;
647
648 case SIOCSIFFLAGS:
649 ret = -EACCES;
650 if (!capable(CAP_NET_ADMIN))
651 goto out;
652 break;
653 case SIOCSIFADDR: /* Set interface address (and family) */
654 case SIOCSIFBRDADDR: /* Set the broadcast address */
655 case SIOCSIFDSTADDR: /* Set the destination address */
656 case SIOCSIFNETMASK: /* Set the netmask for the interface */
657 ret = -EACCES;
658 if (!capable(CAP_NET_ADMIN))
659 goto out;
660 ret = -EINVAL;
661 if (sin->sin_family != AF_INET)
662 goto out;
663 break;
664 default:
665 ret = -EINVAL;
666 goto out;
667 }
668
669 rtnl_lock();
670
671 ret = -ENODEV;
672 if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL)
673 goto done;
674
675 if (colon)
676 *colon = ':';
677
678 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
679 if (tryaddrmatch) {
680 /* Matthias Andree */
681 /* compare label and address (4.4BSD style) */
682 /* note: we only do this for a limited set of ioctls
683 and only if the original address family was AF_INET.
684 This is checked above. */
685 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
686 ifap = &ifa->ifa_next) {
687 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
688 sin_orig.sin_addr.s_addr ==
689 ifa->ifa_address) {
690 break; /* found */
691 }
692 }
693 }
694 /* we didn't get a match, maybe the application is
695 4.3BSD-style and passed in junk so we fall back to
696 comparing just the label */
697 if (!ifa) {
698 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
699 ifap = &ifa->ifa_next)
700 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
701 break;
702 }
703 }
704
705 ret = -EADDRNOTAVAIL;
706 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
707 goto done;
708
709 switch(cmd) {
710 case SIOCGIFADDR: /* Get interface address */
711 sin->sin_addr.s_addr = ifa->ifa_local;
712 goto rarok;
713
714 case SIOCGIFBRDADDR: /* Get the broadcast address */
715 sin->sin_addr.s_addr = ifa->ifa_broadcast;
716 goto rarok;
717
718 case SIOCGIFDSTADDR: /* Get the destination address */
719 sin->sin_addr.s_addr = ifa->ifa_address;
720 goto rarok;
721
722 case SIOCGIFNETMASK: /* Get the netmask for the interface */
723 sin->sin_addr.s_addr = ifa->ifa_mask;
724 goto rarok;
725
726 case SIOCSIFFLAGS:
727 if (colon) {
728 ret = -EADDRNOTAVAIL;
729 if (!ifa)
730 break;
731 ret = 0;
732 if (!(ifr.ifr_flags & IFF_UP))
733 inet_del_ifa(in_dev, ifap, 1);
734 break;
735 }
736 ret = dev_change_flags(dev, ifr.ifr_flags);
737 break;
738
739 case SIOCSIFADDR: /* Set interface address (and family) */
740 ret = -EINVAL;
741 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
742 break;
743
744 if (!ifa) {
745 ret = -ENOBUFS;
746 if ((ifa = inet_alloc_ifa()) == NULL)
747 break;
748 if (colon)
749 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
750 else
751 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
752 } else {
753 ret = 0;
754 if (ifa->ifa_local == sin->sin_addr.s_addr)
755 break;
756 inet_del_ifa(in_dev, ifap, 0);
757 ifa->ifa_broadcast = 0;
758 ifa->ifa_anycast = 0;
759 }
760
761 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
762
763 if (!(dev->flags & IFF_POINTOPOINT)) {
764 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
765 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
766 if ((dev->flags & IFF_BROADCAST) &&
767 ifa->ifa_prefixlen < 31)
768 ifa->ifa_broadcast = ifa->ifa_address |
769 ~ifa->ifa_mask;
770 } else {
771 ifa->ifa_prefixlen = 32;
772 ifa->ifa_mask = inet_make_mask(32);
773 }
774 ret = inet_set_ifa(dev, ifa);
775 break;
776
777 case SIOCSIFBRDADDR: /* Set the broadcast address */
778 ret = 0;
779 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
780 inet_del_ifa(in_dev, ifap, 0);
781 ifa->ifa_broadcast = sin->sin_addr.s_addr;
782 inet_insert_ifa(ifa);
783 }
784 break;
785
786 case SIOCSIFDSTADDR: /* Set the destination address */
787 ret = 0;
788 if (ifa->ifa_address == sin->sin_addr.s_addr)
789 break;
790 ret = -EINVAL;
791 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
792 break;
793 ret = 0;
794 inet_del_ifa(in_dev, ifap, 0);
795 ifa->ifa_address = sin->sin_addr.s_addr;
796 inet_insert_ifa(ifa);
797 break;
798
799 case SIOCSIFNETMASK: /* Set the netmask for the interface */
800
801 /*
802 * The mask we set must be legal.
803 */
804 ret = -EINVAL;
805 if (bad_mask(sin->sin_addr.s_addr, 0))
806 break;
807 ret = 0;
808 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
809 __be32 old_mask = ifa->ifa_mask;
810 inet_del_ifa(in_dev, ifap, 0);
811 ifa->ifa_mask = sin->sin_addr.s_addr;
812 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
813
814 /* See if current broadcast address matches
815 * with current netmask, then recalculate
816 * the broadcast address. Otherwise it's a
817 * funny address, so don't touch it since
818 * the user seems to know what (s)he's doing...
819 */
820 if ((dev->flags & IFF_BROADCAST) &&
821 (ifa->ifa_prefixlen < 31) &&
822 (ifa->ifa_broadcast ==
823 (ifa->ifa_local|~old_mask))) {
824 ifa->ifa_broadcast = (ifa->ifa_local |
825 ~sin->sin_addr.s_addr);
826 }
827 inet_insert_ifa(ifa);
828 }
829 break;
830 }
831 done:
832 rtnl_unlock();
833 out:
834 return ret;
835 rarok:
836 rtnl_unlock();
837 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
838 goto out;
839 }
840
841 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
842 {
843 struct in_device *in_dev = __in_dev_get_rtnl(dev);
844 struct in_ifaddr *ifa;
845 struct ifreq ifr;
846 int done = 0;
847
848 if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
849 goto out;
850
851 for (; ifa; ifa = ifa->ifa_next) {
852 if (!buf) {
853 done += sizeof(ifr);
854 continue;
855 }
856 if (len < (int) sizeof(ifr))
857 break;
858 memset(&ifr, 0, sizeof(struct ifreq));
859 if (ifa->ifa_label)
860 strcpy(ifr.ifr_name, ifa->ifa_label);
861 else
862 strcpy(ifr.ifr_name, dev->name);
863
864 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
865 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
866 ifa->ifa_local;
867
868 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
869 done = -EFAULT;
870 break;
871 }
872 buf += sizeof(struct ifreq);
873 len -= sizeof(struct ifreq);
874 done += sizeof(struct ifreq);
875 }
876 out:
877 return done;
878 }
879
880 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
881 {
882 __be32 addr = 0;
883 struct in_device *in_dev;
884
885 rcu_read_lock();
886 in_dev = __in_dev_get_rcu(dev);
887 if (!in_dev)
888 goto no_in_dev;
889
890 for_primary_ifa(in_dev) {
891 if (ifa->ifa_scope > scope)
892 continue;
893 if (!dst || inet_ifa_match(dst, ifa)) {
894 addr = ifa->ifa_local;
895 break;
896 }
897 if (!addr)
898 addr = ifa->ifa_local;
899 } endfor_ifa(in_dev);
900 no_in_dev:
901 rcu_read_unlock();
902
903 if (addr)
904 goto out;
905
906 /* Not loopback addresses on loopback should be preferred
907 in this case. It is importnat that lo is the first interface
908 in dev_base list.
909 */
910 read_lock(&dev_base_lock);
911 rcu_read_lock();
912 for (dev = dev_base; dev; dev = dev->next) {
913 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
914 continue;
915
916 for_primary_ifa(in_dev) {
917 if (ifa->ifa_scope != RT_SCOPE_LINK &&
918 ifa->ifa_scope <= scope) {
919 addr = ifa->ifa_local;
920 goto out_unlock_both;
921 }
922 } endfor_ifa(in_dev);
923 }
924 out_unlock_both:
925 read_unlock(&dev_base_lock);
926 rcu_read_unlock();
927 out:
928 return addr;
929 }
930
931 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
932 __be32 local, int scope)
933 {
934 int same = 0;
935 __be32 addr = 0;
936
937 for_ifa(in_dev) {
938 if (!addr &&
939 (local == ifa->ifa_local || !local) &&
940 ifa->ifa_scope <= scope) {
941 addr = ifa->ifa_local;
942 if (same)
943 break;
944 }
945 if (!same) {
946 same = (!local || inet_ifa_match(local, ifa)) &&
947 (!dst || inet_ifa_match(dst, ifa));
948 if (same && addr) {
949 if (local || !dst)
950 break;
951 /* Is the selected addr into dst subnet? */
952 if (inet_ifa_match(addr, ifa))
953 break;
954 /* No, then can we use new local src? */
955 if (ifa->ifa_scope <= scope) {
956 addr = ifa->ifa_local;
957 break;
958 }
959 /* search for large dst subnet for addr */
960 same = 0;
961 }
962 }
963 } endfor_ifa(in_dev);
964
965 return same? addr : 0;
966 }
967
968 /*
969 * Confirm that local IP address exists using wildcards:
970 * - dev: only on this interface, 0=any interface
971 * - dst: only in the same subnet as dst, 0=any dst
972 * - local: address, 0=autoselect the local address
973 * - scope: maximum allowed scope value for the local address
974 */
975 __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope)
976 {
977 __be32 addr = 0;
978 struct in_device *in_dev;
979
980 if (dev) {
981 rcu_read_lock();
982 if ((in_dev = __in_dev_get_rcu(dev)))
983 addr = confirm_addr_indev(in_dev, dst, local, scope);
984 rcu_read_unlock();
985
986 return addr;
987 }
988
989 read_lock(&dev_base_lock);
990 rcu_read_lock();
991 for (dev = dev_base; dev; dev = dev->next) {
992 if ((in_dev = __in_dev_get_rcu(dev))) {
993 addr = confirm_addr_indev(in_dev, dst, local, scope);
994 if (addr)
995 break;
996 }
997 }
998 rcu_read_unlock();
999 read_unlock(&dev_base_lock);
1000
1001 return addr;
1002 }
1003
1004 /*
1005 * Device notifier
1006 */
1007
1008 int register_inetaddr_notifier(struct notifier_block *nb)
1009 {
1010 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1011 }
1012
1013 int unregister_inetaddr_notifier(struct notifier_block *nb)
1014 {
1015 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1016 }
1017
1018 /* Rename ifa_labels for a device name change. Make some effort to preserve existing
1019 * alias numbering and to create unique labels if possible.
1020 */
1021 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1022 {
1023 struct in_ifaddr *ifa;
1024 int named = 0;
1025
1026 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1027 char old[IFNAMSIZ], *dot;
1028
1029 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1030 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1031 if (named++ == 0)
1032 continue;
1033 dot = strchr(ifa->ifa_label, ':');
1034 if (dot == NULL) {
1035 sprintf(old, ":%d", named);
1036 dot = old;
1037 }
1038 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1039 strcat(ifa->ifa_label, dot);
1040 } else {
1041 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1042 }
1043 }
1044 }
1045
1046 /* Called only under RTNL semaphore */
1047
1048 static int inetdev_event(struct notifier_block *this, unsigned long event,
1049 void *ptr)
1050 {
1051 struct net_device *dev = ptr;
1052 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1053
1054 ASSERT_RTNL();
1055
1056 if (!in_dev) {
1057 if (event == NETDEV_REGISTER) {
1058 in_dev = inetdev_init(dev);
1059 if (!in_dev)
1060 panic("devinet: Failed to create loopback\n");
1061 if (dev == &loopback_dev) {
1062 in_dev->cnf.no_xfrm = 1;
1063 in_dev->cnf.no_policy = 1;
1064 }
1065 }
1066 goto out;
1067 }
1068
1069 switch (event) {
1070 case NETDEV_REGISTER:
1071 printk(KERN_DEBUG "inetdev_event: bug\n");
1072 dev->ip_ptr = NULL;
1073 break;
1074 case NETDEV_UP:
1075 if (dev->mtu < 68)
1076 break;
1077 if (dev == &loopback_dev) {
1078 struct in_ifaddr *ifa;
1079 if ((ifa = inet_alloc_ifa()) != NULL) {
1080 ifa->ifa_local =
1081 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1082 ifa->ifa_prefixlen = 8;
1083 ifa->ifa_mask = inet_make_mask(8);
1084 in_dev_hold(in_dev);
1085 ifa->ifa_dev = in_dev;
1086 ifa->ifa_scope = RT_SCOPE_HOST;
1087 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1088 inet_insert_ifa(ifa);
1089 }
1090 }
1091 ip_mc_up(in_dev);
1092 break;
1093 case NETDEV_DOWN:
1094 ip_mc_down(in_dev);
1095 break;
1096 case NETDEV_CHANGEMTU:
1097 if (dev->mtu >= 68)
1098 break;
1099 /* MTU falled under 68, disable IP */
1100 case NETDEV_UNREGISTER:
1101 inetdev_destroy(in_dev);
1102 break;
1103 case NETDEV_CHANGENAME:
1104 /* Do not notify about label change, this event is
1105 * not interesting to applications using netlink.
1106 */
1107 inetdev_changename(dev, in_dev);
1108
1109 #ifdef CONFIG_SYSCTL
1110 devinet_sysctl_unregister(&in_dev->cnf);
1111 neigh_sysctl_unregister(in_dev->arp_parms);
1112 neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
1113 NET_IPV4_NEIGH, "ipv4", NULL, NULL);
1114 devinet_sysctl_register(in_dev, &in_dev->cnf);
1115 #endif
1116 break;
1117 }
1118 out:
1119 return NOTIFY_DONE;
1120 }
1121
1122 static struct notifier_block ip_netdev_notifier = {
1123 .notifier_call =inetdev_event,
1124 };
1125
1126 static inline size_t inet_nlmsg_size(void)
1127 {
1128 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1129 + nla_total_size(4) /* IFA_ADDRESS */
1130 + nla_total_size(4) /* IFA_LOCAL */
1131 + nla_total_size(4) /* IFA_BROADCAST */
1132 + nla_total_size(4) /* IFA_ANYCAST */
1133 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1134 }
1135
1136 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1137 u32 pid, u32 seq, int event, unsigned int flags)
1138 {
1139 struct ifaddrmsg *ifm;
1140 struct nlmsghdr *nlh;
1141
1142 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1143 if (nlh == NULL)
1144 return -EMSGSIZE;
1145
1146 ifm = nlmsg_data(nlh);
1147 ifm->ifa_family = AF_INET;
1148 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1149 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1150 ifm->ifa_scope = ifa->ifa_scope;
1151 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1152
1153 if (ifa->ifa_address)
1154 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1155
1156 if (ifa->ifa_local)
1157 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1158
1159 if (ifa->ifa_broadcast)
1160 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1161
1162 if (ifa->ifa_anycast)
1163 NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast);
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 int idx, ip_idx;
1178 struct net_device *dev;
1179 struct in_device *in_dev;
1180 struct in_ifaddr *ifa;
1181 int s_ip_idx, s_idx = cb->args[0];
1182
1183 s_ip_idx = ip_idx = cb->args[1];
1184 read_lock(&dev_base_lock);
1185 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
1186 if (idx < s_idx)
1187 continue;
1188 if (idx > s_idx)
1189 s_ip_idx = 0;
1190 rcu_read_lock();
1191 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
1192 rcu_read_unlock();
1193 continue;
1194 }
1195
1196 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1197 ifa = ifa->ifa_next, ip_idx++) {
1198 if (ip_idx < s_ip_idx)
1199 continue;
1200 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1201 cb->nlh->nlmsg_seq,
1202 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1203 rcu_read_unlock();
1204 goto done;
1205 }
1206 }
1207 rcu_read_unlock();
1208 }
1209
1210 done:
1211 read_unlock(&dev_base_lock);
1212 cb->args[0] = idx;
1213 cb->args[1] = ip_idx;
1214
1215 return skb->len;
1216 }
1217
1218 static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
1219 u32 pid)
1220 {
1221 struct sk_buff *skb;
1222 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1223 int err = -ENOBUFS;
1224
1225 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1226 if (skb == NULL)
1227 goto errout;
1228
1229 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1230 if (err < 0) {
1231 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1232 WARN_ON(err == -EMSGSIZE);
1233 kfree_skb(skb);
1234 goto errout;
1235 }
1236 err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1237 errout:
1238 if (err < 0)
1239 rtnl_set_sk_err(RTNLGRP_IPV4_IFADDR, err);
1240 }
1241
1242 static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = {
1243 [RTM_NEWADDR - RTM_BASE] = { .doit = inet_rtm_newaddr, },
1244 [RTM_DELADDR - RTM_BASE] = { .doit = inet_rtm_deladdr, },
1245 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet_dump_ifaddr, },
1246 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet_rtm_newroute, },
1247 [RTM_DELROUTE - RTM_BASE] = { .doit = inet_rtm_delroute, },
1248 [RTM_GETROUTE - RTM_BASE] = { .doit = inet_rtm_getroute,
1249 .dumpit = inet_dump_fib, },
1250 #ifdef CONFIG_IP_MULTIPLE_TABLES
1251 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib4_rules_dump, },
1252 #endif
1253 };
1254
1255 #ifdef CONFIG_SYSCTL
1256
1257 void inet_forward_change(void)
1258 {
1259 struct net_device *dev;
1260 int on = ipv4_devconf.forwarding;
1261
1262 ipv4_devconf.accept_redirects = !on;
1263 ipv4_devconf_dflt.forwarding = on;
1264
1265 read_lock(&dev_base_lock);
1266 for (dev = dev_base; dev; dev = dev->next) {
1267 struct in_device *in_dev;
1268 rcu_read_lock();
1269 in_dev = __in_dev_get_rcu(dev);
1270 if (in_dev)
1271 in_dev->cnf.forwarding = on;
1272 rcu_read_unlock();
1273 }
1274 read_unlock(&dev_base_lock);
1275
1276 rt_cache_flush(0);
1277 }
1278
1279 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1280 struct file* filp, void __user *buffer,
1281 size_t *lenp, loff_t *ppos)
1282 {
1283 int *valp = ctl->data;
1284 int val = *valp;
1285 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1286
1287 if (write && *valp != val) {
1288 if (valp == &ipv4_devconf.forwarding)
1289 inet_forward_change();
1290 else if (valp != &ipv4_devconf_dflt.forwarding)
1291 rt_cache_flush(0);
1292 }
1293
1294 return ret;
1295 }
1296
1297 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1298 struct file* filp, void __user *buffer,
1299 size_t *lenp, loff_t *ppos)
1300 {
1301 int *valp = ctl->data;
1302 int val = *valp;
1303 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1304
1305 if (write && *valp != val)
1306 rt_cache_flush(0);
1307
1308 return ret;
1309 }
1310
1311 int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
1312 void __user *oldval, size_t __user *oldlenp,
1313 void __user *newval, size_t newlen)
1314 {
1315 int *valp = table->data;
1316 int new;
1317
1318 if (!newval || !newlen)
1319 return 0;
1320
1321 if (newlen != sizeof(int))
1322 return -EINVAL;
1323
1324 if (get_user(new, (int __user *)newval))
1325 return -EFAULT;
1326
1327 if (new == *valp)
1328 return 0;
1329
1330 if (oldval && oldlenp) {
1331 size_t len;
1332
1333 if (get_user(len, oldlenp))
1334 return -EFAULT;
1335
1336 if (len) {
1337 if (len > table->maxlen)
1338 len = table->maxlen;
1339 if (copy_to_user(oldval, valp, len))
1340 return -EFAULT;
1341 if (put_user(len, oldlenp))
1342 return -EFAULT;
1343 }
1344 }
1345
1346 *valp = new;
1347 rt_cache_flush(0);
1348 return 1;
1349 }
1350
1351
1352 static struct devinet_sysctl_table {
1353 struct ctl_table_header *sysctl_header;
1354 ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
1355 ctl_table devinet_dev[2];
1356 ctl_table devinet_conf_dir[2];
1357 ctl_table devinet_proto_dir[2];
1358 ctl_table devinet_root_dir[2];
1359 } devinet_sysctl = {
1360 .devinet_vars = {
1361 {
1362 .ctl_name = NET_IPV4_CONF_FORWARDING,
1363 .procname = "forwarding",
1364 .data = &ipv4_devconf.forwarding,
1365 .maxlen = sizeof(int),
1366 .mode = 0644,
1367 .proc_handler = &devinet_sysctl_forward,
1368 },
1369 {
1370 .ctl_name = NET_IPV4_CONF_MC_FORWARDING,
1371 .procname = "mc_forwarding",
1372 .data = &ipv4_devconf.mc_forwarding,
1373 .maxlen = sizeof(int),
1374 .mode = 0444,
1375 .proc_handler = &proc_dointvec,
1376 },
1377 {
1378 .ctl_name = NET_IPV4_CONF_ACCEPT_REDIRECTS,
1379 .procname = "accept_redirects",
1380 .data = &ipv4_devconf.accept_redirects,
1381 .maxlen = sizeof(int),
1382 .mode = 0644,
1383 .proc_handler = &proc_dointvec,
1384 },
1385 {
1386 .ctl_name = NET_IPV4_CONF_SECURE_REDIRECTS,
1387 .procname = "secure_redirects",
1388 .data = &ipv4_devconf.secure_redirects,
1389 .maxlen = sizeof(int),
1390 .mode = 0644,
1391 .proc_handler = &proc_dointvec,
1392 },
1393 {
1394 .ctl_name = NET_IPV4_CONF_SHARED_MEDIA,
1395 .procname = "shared_media",
1396 .data = &ipv4_devconf.shared_media,
1397 .maxlen = sizeof(int),
1398 .mode = 0644,
1399 .proc_handler = &proc_dointvec,
1400 },
1401 {
1402 .ctl_name = NET_IPV4_CONF_RP_FILTER,
1403 .procname = "rp_filter",
1404 .data = &ipv4_devconf.rp_filter,
1405 .maxlen = sizeof(int),
1406 .mode = 0644,
1407 .proc_handler = &proc_dointvec,
1408 },
1409 {
1410 .ctl_name = NET_IPV4_CONF_SEND_REDIRECTS,
1411 .procname = "send_redirects",
1412 .data = &ipv4_devconf.send_redirects,
1413 .maxlen = sizeof(int),
1414 .mode = 0644,
1415 .proc_handler = &proc_dointvec,
1416 },
1417 {
1418 .ctl_name = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE,
1419 .procname = "accept_source_route",
1420 .data = &ipv4_devconf.accept_source_route,
1421 .maxlen = sizeof(int),
1422 .mode = 0644,
1423 .proc_handler = &proc_dointvec,
1424 },
1425 {
1426 .ctl_name = NET_IPV4_CONF_PROXY_ARP,
1427 .procname = "proxy_arp",
1428 .data = &ipv4_devconf.proxy_arp,
1429 .maxlen = sizeof(int),
1430 .mode = 0644,
1431 .proc_handler = &proc_dointvec,
1432 },
1433 {
1434 .ctl_name = NET_IPV4_CONF_MEDIUM_ID,
1435 .procname = "medium_id",
1436 .data = &ipv4_devconf.medium_id,
1437 .maxlen = sizeof(int),
1438 .mode = 0644,
1439 .proc_handler = &proc_dointvec,
1440 },
1441 {
1442 .ctl_name = NET_IPV4_CONF_BOOTP_RELAY,
1443 .procname = "bootp_relay",
1444 .data = &ipv4_devconf.bootp_relay,
1445 .maxlen = sizeof(int),
1446 .mode = 0644,
1447 .proc_handler = &proc_dointvec,
1448 },
1449 {
1450 .ctl_name = NET_IPV4_CONF_LOG_MARTIANS,
1451 .procname = "log_martians",
1452 .data = &ipv4_devconf.log_martians,
1453 .maxlen = sizeof(int),
1454 .mode = 0644,
1455 .proc_handler = &proc_dointvec,
1456 },
1457 {
1458 .ctl_name = NET_IPV4_CONF_TAG,
1459 .procname = "tag",
1460 .data = &ipv4_devconf.tag,
1461 .maxlen = sizeof(int),
1462 .mode = 0644,
1463 .proc_handler = &proc_dointvec,
1464 },
1465 {
1466 .ctl_name = NET_IPV4_CONF_ARPFILTER,
1467 .procname = "arp_filter",
1468 .data = &ipv4_devconf.arp_filter,
1469 .maxlen = sizeof(int),
1470 .mode = 0644,
1471 .proc_handler = &proc_dointvec,
1472 },
1473 {
1474 .ctl_name = NET_IPV4_CONF_ARP_ANNOUNCE,
1475 .procname = "arp_announce",
1476 .data = &ipv4_devconf.arp_announce,
1477 .maxlen = sizeof(int),
1478 .mode = 0644,
1479 .proc_handler = &proc_dointvec,
1480 },
1481 {
1482 .ctl_name = NET_IPV4_CONF_ARP_IGNORE,
1483 .procname = "arp_ignore",
1484 .data = &ipv4_devconf.arp_ignore,
1485 .maxlen = sizeof(int),
1486 .mode = 0644,
1487 .proc_handler = &proc_dointvec,
1488 },
1489 {
1490 .ctl_name = NET_IPV4_CONF_ARP_ACCEPT,
1491 .procname = "arp_accept",
1492 .data = &ipv4_devconf.arp_accept,
1493 .maxlen = sizeof(int),
1494 .mode = 0644,
1495 .proc_handler = &proc_dointvec,
1496 },
1497 {
1498 .ctl_name = NET_IPV4_CONF_NOXFRM,
1499 .procname = "disable_xfrm",
1500 .data = &ipv4_devconf.no_xfrm,
1501 .maxlen = sizeof(int),
1502 .mode = 0644,
1503 .proc_handler = &ipv4_doint_and_flush,
1504 .strategy = &ipv4_doint_and_flush_strategy,
1505 },
1506 {
1507 .ctl_name = NET_IPV4_CONF_NOPOLICY,
1508 .procname = "disable_policy",
1509 .data = &ipv4_devconf.no_policy,
1510 .maxlen = sizeof(int),
1511 .mode = 0644,
1512 .proc_handler = &ipv4_doint_and_flush,
1513 .strategy = &ipv4_doint_and_flush_strategy,
1514 },
1515 {
1516 .ctl_name = NET_IPV4_CONF_FORCE_IGMP_VERSION,
1517 .procname = "force_igmp_version",
1518 .data = &ipv4_devconf.force_igmp_version,
1519 .maxlen = sizeof(int),
1520 .mode = 0644,
1521 .proc_handler = &ipv4_doint_and_flush,
1522 .strategy = &ipv4_doint_and_flush_strategy,
1523 },
1524 {
1525 .ctl_name = NET_IPV4_CONF_PROMOTE_SECONDARIES,
1526 .procname = "promote_secondaries",
1527 .data = &ipv4_devconf.promote_secondaries,
1528 .maxlen = sizeof(int),
1529 .mode = 0644,
1530 .proc_handler = &ipv4_doint_and_flush,
1531 .strategy = &ipv4_doint_and_flush_strategy,
1532 },
1533 },
1534 .devinet_dev = {
1535 {
1536 .ctl_name = NET_PROTO_CONF_ALL,
1537 .procname = "all",
1538 .mode = 0555,
1539 .child = devinet_sysctl.devinet_vars,
1540 },
1541 },
1542 .devinet_conf_dir = {
1543 {
1544 .ctl_name = NET_IPV4_CONF,
1545 .procname = "conf",
1546 .mode = 0555,
1547 .child = devinet_sysctl.devinet_dev,
1548 },
1549 },
1550 .devinet_proto_dir = {
1551 {
1552 .ctl_name = NET_IPV4,
1553 .procname = "ipv4",
1554 .mode = 0555,
1555 .child = devinet_sysctl.devinet_conf_dir,
1556 },
1557 },
1558 .devinet_root_dir = {
1559 {
1560 .ctl_name = CTL_NET,
1561 .procname = "net",
1562 .mode = 0555,
1563 .child = devinet_sysctl.devinet_proto_dir,
1564 },
1565 },
1566 };
1567
1568 static void devinet_sysctl_register(struct in_device *in_dev,
1569 struct ipv4_devconf *p)
1570 {
1571 int i;
1572 struct net_device *dev = in_dev ? in_dev->dev : NULL;
1573 struct devinet_sysctl_table *t = kmemdup(&devinet_sysctl, sizeof(*t),
1574 GFP_KERNEL);
1575 char *dev_name = NULL;
1576
1577 if (!t)
1578 return;
1579 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1580 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
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_conf_dir[0].child = t->devinet_dev;
1603 t->devinet_proto_dir[0].child = t->devinet_conf_dir;
1604 t->devinet_root_dir[0].child = t->devinet_proto_dir;
1605
1606 t->sysctl_header = register_sysctl_table(t->devinet_root_dir);
1607 if (!t->sysctl_header)
1608 goto free_procname;
1609
1610 p->sysctl = t;
1611 return;
1612
1613 /* error path */
1614 free_procname:
1615 kfree(dev_name);
1616 free:
1617 kfree(t);
1618 return;
1619 }
1620
1621 static void devinet_sysctl_unregister(struct ipv4_devconf *p)
1622 {
1623 if (p->sysctl) {
1624 struct devinet_sysctl_table *t = p->sysctl;
1625 p->sysctl = NULL;
1626 unregister_sysctl_table(t->sysctl_header);
1627 kfree(t->devinet_dev[0].procname);
1628 kfree(t);
1629 }
1630 }
1631 #endif
1632
1633 void __init devinet_init(void)
1634 {
1635 register_gifconf(PF_INET, inet_gifconf);
1636 register_netdevice_notifier(&ip_netdev_notifier);
1637 rtnetlink_links[PF_INET] = inet_rtnetlink_table;
1638 #ifdef CONFIG_SYSCTL
1639 devinet_sysctl.sysctl_header =
1640 register_sysctl_table(devinet_sysctl.devinet_root_dir);
1641 devinet_sysctl_register(NULL, &ipv4_devconf_dflt);
1642 #endif
1643 }
1644
1645 EXPORT_SYMBOL(in_dev_finish_destroy);
1646 EXPORT_SYMBOL(inet_select_addr);
1647 EXPORT_SYMBOL(inetdev_by_index);
1648 EXPORT_SYMBOL(register_inetaddr_notifier);
1649 EXPORT_SYMBOL(unregister_inetaddr_notifier);
Linux kernel - Deliverables
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