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1da177e4 LT |
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 | |
02c30a84 | 12 | * Authors: Ross Biro |
1da177e4 LT |
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 | ||
1da177e4 LT |
30 | |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/system.h> | |
33 | #include <linux/bitops.h> | |
4fc268d2 | 34 | #include <linux/capability.h> |
1da177e4 LT |
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> | |
1823730f | 46 | #include <linux/if_addr.h> |
1da177e4 LT |
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 | ||
14c85021 | 62 | #include <net/arp.h> |
1da177e4 LT |
63 | #include <net/ip.h> |
64 | #include <net/route.h> | |
65 | #include <net/ip_fib.h> | |
5c753978 | 66 | #include <net/netlink.h> |
1da177e4 LT |
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 | ||
5c753978 TG |
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 }, | |
5176f91e | 88 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c753978 TG |
89 | }; |
90 | ||
d6062cbb | 91 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 92 | |
e041c683 | 93 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
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 | { | |
0da974f4 | 106 | struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); |
1da177e4 LT |
107 | |
108 | if (ifa) { | |
1da177e4 LT |
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 | ||
0da974f4 | 152 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
153 | if (!in_dev) |
154 | goto out; | |
1da177e4 LT |
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 | ||
30c4cf57 | 168 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 169 | in_dev_hold(in_dev); |
1da177e4 LT |
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); | |
483479ec | 177 | |
30c4cf57 DS |
178 | /* we can receive as soon as ip_ptr is set -- do this last */ |
179 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 180 | out: |
1da177e4 LT |
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 | ||
ff428d72 | 229 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
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 | ||
d6062cbb TG |
244 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
245 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 246 | { |
8f937c60 | 247 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
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); | |
1da177e4 LT |
252 | |
253 | ASSERT_RTNL(); | |
254 | ||
8f937c60 HW |
255 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
256 | * unless alias promotion is set | |
257 | **/ | |
1da177e4 LT |
258 | |
259 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
260 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
261 | ||
262 | while ((ifa = *ifap1) != NULL) { | |
0ff60a45 JHS |
263 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
264 | ifa1->ifa_scope <= ifa->ifa_scope) | |
265 | last_prim = ifa; | |
266 | ||
1da177e4 LT |
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; | |
0ff60a45 | 271 | prev_prom = ifa; |
1da177e4 LT |
272 | continue; |
273 | } | |
274 | ||
0ff60a45 | 275 | if (!do_promote) { |
8f937c60 | 276 | *ifap1 = ifa->ifa_next; |
1da177e4 | 277 | |
d6062cbb | 278 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
279 | blocking_notifier_call_chain(&inetaddr_chain, |
280 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
281 | inet_free_ifa(ifa); |
282 | } else { | |
283 | promote = ifa; | |
284 | break; | |
285 | } | |
1da177e4 LT |
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 | */ | |
d6062cbb | 303 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 304 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 305 | |
0ff60a45 JHS |
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 | } | |
8f937c60 | 313 | |
8f937c60 | 314 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 315 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
316 | blocking_notifier_call_chain(&inetaddr_chain, |
317 | NETDEV_UP, promote); | |
0ff60a45 JHS |
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); | |
8f937c60 | 331 | } |
1da177e4 LT |
332 | } |
333 | ||
d6062cbb TG |
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) | |
1da177e4 LT |
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 */ | |
d6062cbb | 386 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 387 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
388 | |
389 | return 0; | |
390 | } | |
391 | ||
d6062cbb TG |
392 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
393 | { | |
394 | return __inet_insert_ifa(ifa, NULL, 0); | |
395 | } | |
396 | ||
1da177e4 LT |
397 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
398 | { | |
e5ed6399 | 399 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
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 | ||
60cad5da AV |
434 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
435 | __be32 mask) | |
1da177e4 LT |
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 | { | |
dfdd5fd4 | 448 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 449 | struct in_device *in_dev; |
dfdd5fd4 | 450 | struct ifaddrmsg *ifm; |
1da177e4 | 451 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 452 | int err = -EINVAL; |
1da177e4 LT |
453 | |
454 | ASSERT_RTNL(); | |
455 | ||
dfdd5fd4 TG |
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 | ||
1da177e4 LT |
467 | __in_dev_put(in_dev); |
468 | ||
469 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
470 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 471 | if (tb[IFA_LOCAL] && |
a7a628c4 | 472 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
473 | continue; |
474 | ||
475 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 476 | continue; |
dfdd5fd4 TG |
477 | |
478 | if (tb[IFA_ADDRESS] && | |
479 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 480 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
481 | continue; |
482 | ||
d6062cbb | 483 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
484 | return 0; |
485 | } | |
dfdd5fd4 TG |
486 | |
487 | err = -EADDRNOTAVAIL; | |
488 | errout: | |
489 | return err; | |
1da177e4 LT |
490 | } |
491 | ||
5c753978 | 492 | static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh) |
1da177e4 | 493 | { |
5c753978 TG |
494 | struct nlattr *tb[IFA_MAX+1]; |
495 | struct in_ifaddr *ifa; | |
496 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
497 | struct net_device *dev; |
498 | struct in_device *in_dev; | |
5c753978 | 499 | int err = -EINVAL; |
1da177e4 | 500 | |
5c753978 TG |
501 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
502 | if (err < 0) | |
503 | goto errout; | |
1da177e4 | 504 | |
5c753978 TG |
505 | ifm = nlmsg_data(nlh); |
506 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
507 | goto errout; | |
1da177e4 | 508 | |
5c753978 TG |
509 | dev = __dev_get_by_index(ifm->ifa_index); |
510 | if (dev == NULL) { | |
511 | err = -ENODEV; | |
512 | goto errout; | |
513 | } | |
1da177e4 | 514 | |
5c753978 TG |
515 | in_dev = __in_dev_get_rtnl(dev); |
516 | if (in_dev == NULL) { | |
1da177e4 | 517 | in_dev = inetdev_init(dev); |
5c753978 TG |
518 | if (in_dev == NULL) { |
519 | err = -ENOBUFS; | |
520 | goto errout; | |
521 | } | |
1da177e4 LT |
522 | } |
523 | ||
5c753978 TG |
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]; | |
1da177e4 | 538 | |
1da177e4 LT |
539 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
540 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
541 | ifa->ifa_flags = ifm->ifa_flags; |
542 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
543 | ifa->ifa_dev = in_dev; |
544 | ||
a7a628c4 AV |
545 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
546 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
547 | |
548 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 549 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 TG |
550 | |
551 | if (tb[IFA_ANYCAST]) | |
a7a628c4 | 552 | ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]); |
5c753978 TG |
553 | |
554 | if (tb[IFA_LABEL]) | |
555 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
556 | else |
557 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
558 | ||
5c753978 TG |
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 | ||
d6062cbb | 575 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
576 | } |
577 | ||
578 | /* | |
579 | * Determine a default network mask, based on the IP address. | |
580 | */ | |
581 | ||
714e85be | 582 | static __inline__ int inet_abc_len(__be32 addr) |
1da177e4 LT |
583 | { |
584 | int rc = -1; /* Something else, probably a multicast. */ | |
585 | ||
586 | if (ZERONET(addr)) | |
587 | rc = 0; | |
588 | else { | |
714e85be | 589 | __u32 haddr = ntohl(addr); |
1da177e4 | 590 | |
714e85be | 591 | if (IN_CLASSA(haddr)) |
1da177e4 | 592 | rc = 8; |
714e85be | 593 | else if (IN_CLASSB(haddr)) |
1da177e4 | 594 | rc = 16; |
714e85be | 595 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
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 | ||
e5ed6399 | 679 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
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) { | |
a144ea4b | 810 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
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 == | |
dcab5e1e | 824 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
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 | { | |
e5ed6399 | 844 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
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 | ||
a61ced5d | 881 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 882 | { |
a61ced5d | 883 | __be32 addr = 0; |
1da177e4 LT |
884 | struct in_device *in_dev; |
885 | ||
886 | rcu_read_lock(); | |
e5ed6399 | 887 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
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) { | |
e5ed6399 | 914 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) |
1da177e4 LT |
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 | ||
60cad5da AV |
932 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
933 | __be32 local, int scope) | |
1da177e4 LT |
934 | { |
935 | int same = 0; | |
a144ea4b | 936 | __be32 addr = 0; |
1da177e4 LT |
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 | */ | |
60cad5da | 976 | __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope) |
1da177e4 | 977 | { |
60cad5da | 978 | __be32 addr = 0; |
1da177e4 LT |
979 | struct in_device *in_dev; |
980 | ||
981 | if (dev) { | |
982 | rcu_read_lock(); | |
e5ed6399 | 983 | if ((in_dev = __in_dev_get_rcu(dev))) |
1da177e4 LT |
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) { | |
e5ed6399 | 993 | if ((in_dev = __in_dev_get_rcu(dev))) { |
1da177e4 LT |
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 | { | |
e041c683 | 1011 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1015 | { | |
e041c683 | 1016 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 LT |
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; | |
e5ed6399 | 1053 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
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 | ||
339bf98f TG |
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 | ||
1da177e4 | 1135 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1136 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1137 | { |
1138 | struct ifaddrmsg *ifm; | |
1139 | struct nlmsghdr *nlh; | |
1da177e4 | 1140 | |
47f68512 TG |
1141 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1142 | if (nlh == NULL) | |
1143 | return -ENOBUFS; | |
1144 | ||
1145 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
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; | |
47f68512 | 1151 | |
1da177e4 | 1152 | if (ifa->ifa_address) |
a7a628c4 | 1153 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1154 | |
1da177e4 | 1155 | if (ifa->ifa_local) |
a7a628c4 | 1156 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1157 | |
1da177e4 | 1158 | if (ifa->ifa_broadcast) |
a7a628c4 | 1159 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1160 | |
1da177e4 | 1161 | if (ifa->ifa_anycast) |
a7a628c4 | 1162 | NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast); |
47f68512 | 1163 | |
1da177e4 | 1164 | if (ifa->ifa_label[0]) |
47f68512 | 1165 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1166 | |
47f68512 TG |
1167 | return nlmsg_end(skb, nlh); |
1168 | ||
1169 | nla_put_failure: | |
1170 | return nlmsg_cancel(skb, nlh); | |
1da177e4 LT |
1171 | } |
1172 | ||
1173 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1174 | { | |
1175 | int idx, ip_idx; | |
1176 | struct net_device *dev; | |
1177 | struct in_device *in_dev; | |
1178 | struct in_ifaddr *ifa; | |
1179 | int s_ip_idx, s_idx = cb->args[0]; | |
1180 | ||
1181 | s_ip_idx = ip_idx = cb->args[1]; | |
1182 | read_lock(&dev_base_lock); | |
1183 | for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { | |
1184 | if (idx < s_idx) | |
1185 | continue; | |
1186 | if (idx > s_idx) | |
1187 | s_ip_idx = 0; | |
1188 | rcu_read_lock(); | |
e5ed6399 | 1189 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
1da177e4 LT |
1190 | rcu_read_unlock(); |
1191 | continue; | |
1192 | } | |
1193 | ||
1194 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1195 | ifa = ifa->ifa_next, ip_idx++) { | |
1196 | if (ip_idx < s_ip_idx) | |
1197 | continue; | |
1198 | if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, | |
1199 | cb->nlh->nlmsg_seq, | |
b6544c0b | 1200 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
1201 | rcu_read_unlock(); |
1202 | goto done; | |
1203 | } | |
1204 | } | |
1205 | rcu_read_unlock(); | |
1206 | } | |
1207 | ||
1208 | done: | |
1209 | read_unlock(&dev_base_lock); | |
1210 | cb->args[0] = idx; | |
1211 | cb->args[1] = ip_idx; | |
1212 | ||
1213 | return skb->len; | |
1214 | } | |
1215 | ||
d6062cbb TG |
1216 | static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh, |
1217 | u32 pid) | |
1da177e4 | 1218 | { |
47f68512 | 1219 | struct sk_buff *skb; |
d6062cbb TG |
1220 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1221 | int err = -ENOBUFS; | |
1da177e4 | 1222 | |
339bf98f | 1223 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1224 | if (skb == NULL) |
d6062cbb TG |
1225 | goto errout; |
1226 | ||
1227 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
339bf98f TG |
1228 | /* failure implies BUG in inet_nlmsg_size() */ |
1229 | BUG_ON(err < 0); | |
d6062cbb TG |
1230 | |
1231 | err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); | |
1232 | errout: | |
1233 | if (err < 0) | |
1234 | rtnl_set_sk_err(RTNLGRP_IPV4_IFADDR, err); | |
1da177e4 LT |
1235 | } |
1236 | ||
db46edc6 TG |
1237 | static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = { |
1238 | [RTM_NEWADDR - RTM_BASE] = { .doit = inet_rtm_newaddr, }, | |
1239 | [RTM_DELADDR - RTM_BASE] = { .doit = inet_rtm_deladdr, }, | |
1240 | [RTM_GETADDR - RTM_BASE] = { .dumpit = inet_dump_ifaddr, }, | |
1241 | [RTM_NEWROUTE - RTM_BASE] = { .doit = inet_rtm_newroute, }, | |
1242 | [RTM_DELROUTE - RTM_BASE] = { .doit = inet_rtm_delroute, }, | |
1243 | [RTM_GETROUTE - RTM_BASE] = { .doit = inet_rtm_getroute, | |
1244 | .dumpit = inet_dump_fib, }, | |
1da177e4 | 1245 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
e1ef4bf2 | 1246 | [RTM_GETRULE - RTM_BASE] = { .dumpit = fib4_rules_dump, }, |
1da177e4 LT |
1247 | #endif |
1248 | }; | |
1249 | ||
1250 | #ifdef CONFIG_SYSCTL | |
1251 | ||
1252 | void inet_forward_change(void) | |
1253 | { | |
1254 | struct net_device *dev; | |
1255 | int on = ipv4_devconf.forwarding; | |
1256 | ||
1257 | ipv4_devconf.accept_redirects = !on; | |
1258 | ipv4_devconf_dflt.forwarding = on; | |
1259 | ||
1260 | read_lock(&dev_base_lock); | |
1261 | for (dev = dev_base; dev; dev = dev->next) { | |
1262 | struct in_device *in_dev; | |
1263 | rcu_read_lock(); | |
e5ed6399 | 1264 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
1265 | if (in_dev) |
1266 | in_dev->cnf.forwarding = on; | |
1267 | rcu_read_unlock(); | |
1268 | } | |
1269 | read_unlock(&dev_base_lock); | |
1270 | ||
1271 | rt_cache_flush(0); | |
1272 | } | |
1273 | ||
1274 | static int devinet_sysctl_forward(ctl_table *ctl, int write, | |
1275 | struct file* filp, void __user *buffer, | |
1276 | size_t *lenp, loff_t *ppos) | |
1277 | { | |
1278 | int *valp = ctl->data; | |
1279 | int val = *valp; | |
1280 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1281 | ||
1282 | if (write && *valp != val) { | |
1283 | if (valp == &ipv4_devconf.forwarding) | |
1284 | inet_forward_change(); | |
1285 | else if (valp != &ipv4_devconf_dflt.forwarding) | |
1286 | rt_cache_flush(0); | |
1287 | } | |
1288 | ||
1289 | return ret; | |
1290 | } | |
1291 | ||
1292 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
1293 | struct file* filp, void __user *buffer, | |
1294 | size_t *lenp, loff_t *ppos) | |
1295 | { | |
1296 | int *valp = ctl->data; | |
1297 | int val = *valp; | |
1298 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1299 | ||
1300 | if (write && *valp != val) | |
1301 | rt_cache_flush(0); | |
1302 | ||
1303 | return ret; | |
1304 | } | |
1305 | ||
1306 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
1307 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 1308 | void __user *newval, size_t newlen) |
1da177e4 LT |
1309 | { |
1310 | int *valp = table->data; | |
1311 | int new; | |
1312 | ||
1313 | if (!newval || !newlen) | |
1314 | return 0; | |
1315 | ||
1316 | if (newlen != sizeof(int)) | |
1317 | return -EINVAL; | |
1318 | ||
1319 | if (get_user(new, (int __user *)newval)) | |
1320 | return -EFAULT; | |
1321 | ||
1322 | if (new == *valp) | |
1323 | return 0; | |
1324 | ||
1325 | if (oldval && oldlenp) { | |
1326 | size_t len; | |
1327 | ||
1328 | if (get_user(len, oldlenp)) | |
1329 | return -EFAULT; | |
1330 | ||
1331 | if (len) { | |
1332 | if (len > table->maxlen) | |
1333 | len = table->maxlen; | |
1334 | if (copy_to_user(oldval, valp, len)) | |
1335 | return -EFAULT; | |
1336 | if (put_user(len, oldlenp)) | |
1337 | return -EFAULT; | |
1338 | } | |
1339 | } | |
1340 | ||
1341 | *valp = new; | |
1342 | rt_cache_flush(0); | |
1343 | return 1; | |
1344 | } | |
1345 | ||
1346 | ||
1347 | static struct devinet_sysctl_table { | |
1348 | struct ctl_table_header *sysctl_header; | |
1349 | ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; | |
1350 | ctl_table devinet_dev[2]; | |
1351 | ctl_table devinet_conf_dir[2]; | |
1352 | ctl_table devinet_proto_dir[2]; | |
1353 | ctl_table devinet_root_dir[2]; | |
1354 | } devinet_sysctl = { | |
1355 | .devinet_vars = { | |
1356 | { | |
1357 | .ctl_name = NET_IPV4_CONF_FORWARDING, | |
1358 | .procname = "forwarding", | |
1359 | .data = &ipv4_devconf.forwarding, | |
1360 | .maxlen = sizeof(int), | |
1361 | .mode = 0644, | |
1362 | .proc_handler = &devinet_sysctl_forward, | |
1363 | }, | |
1364 | { | |
1365 | .ctl_name = NET_IPV4_CONF_MC_FORWARDING, | |
1366 | .procname = "mc_forwarding", | |
1367 | .data = &ipv4_devconf.mc_forwarding, | |
1368 | .maxlen = sizeof(int), | |
1369 | .mode = 0444, | |
1370 | .proc_handler = &proc_dointvec, | |
1371 | }, | |
1372 | { | |
1373 | .ctl_name = NET_IPV4_CONF_ACCEPT_REDIRECTS, | |
1374 | .procname = "accept_redirects", | |
1375 | .data = &ipv4_devconf.accept_redirects, | |
1376 | .maxlen = sizeof(int), | |
1377 | .mode = 0644, | |
1378 | .proc_handler = &proc_dointvec, | |
1379 | }, | |
1380 | { | |
1381 | .ctl_name = NET_IPV4_CONF_SECURE_REDIRECTS, | |
1382 | .procname = "secure_redirects", | |
1383 | .data = &ipv4_devconf.secure_redirects, | |
1384 | .maxlen = sizeof(int), | |
1385 | .mode = 0644, | |
1386 | .proc_handler = &proc_dointvec, | |
1387 | }, | |
1388 | { | |
1389 | .ctl_name = NET_IPV4_CONF_SHARED_MEDIA, | |
1390 | .procname = "shared_media", | |
1391 | .data = &ipv4_devconf.shared_media, | |
1392 | .maxlen = sizeof(int), | |
1393 | .mode = 0644, | |
1394 | .proc_handler = &proc_dointvec, | |
1395 | }, | |
1396 | { | |
1397 | .ctl_name = NET_IPV4_CONF_RP_FILTER, | |
1398 | .procname = "rp_filter", | |
1399 | .data = &ipv4_devconf.rp_filter, | |
1400 | .maxlen = sizeof(int), | |
1401 | .mode = 0644, | |
1402 | .proc_handler = &proc_dointvec, | |
1403 | }, | |
1404 | { | |
1405 | .ctl_name = NET_IPV4_CONF_SEND_REDIRECTS, | |
1406 | .procname = "send_redirects", | |
1407 | .data = &ipv4_devconf.send_redirects, | |
1408 | .maxlen = sizeof(int), | |
1409 | .mode = 0644, | |
1410 | .proc_handler = &proc_dointvec, | |
1411 | }, | |
1412 | { | |
1413 | .ctl_name = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE, | |
1414 | .procname = "accept_source_route", | |
1415 | .data = &ipv4_devconf.accept_source_route, | |
1416 | .maxlen = sizeof(int), | |
1417 | .mode = 0644, | |
1418 | .proc_handler = &proc_dointvec, | |
1419 | }, | |
1420 | { | |
1421 | .ctl_name = NET_IPV4_CONF_PROXY_ARP, | |
1422 | .procname = "proxy_arp", | |
1423 | .data = &ipv4_devconf.proxy_arp, | |
1424 | .maxlen = sizeof(int), | |
1425 | .mode = 0644, | |
1426 | .proc_handler = &proc_dointvec, | |
1427 | }, | |
1428 | { | |
1429 | .ctl_name = NET_IPV4_CONF_MEDIUM_ID, | |
1430 | .procname = "medium_id", | |
1431 | .data = &ipv4_devconf.medium_id, | |
1432 | .maxlen = sizeof(int), | |
1433 | .mode = 0644, | |
1434 | .proc_handler = &proc_dointvec, | |
1435 | }, | |
1436 | { | |
1437 | .ctl_name = NET_IPV4_CONF_BOOTP_RELAY, | |
1438 | .procname = "bootp_relay", | |
1439 | .data = &ipv4_devconf.bootp_relay, | |
1440 | .maxlen = sizeof(int), | |
1441 | .mode = 0644, | |
1442 | .proc_handler = &proc_dointvec, | |
1443 | }, | |
1444 | { | |
1445 | .ctl_name = NET_IPV4_CONF_LOG_MARTIANS, | |
1446 | .procname = "log_martians", | |
1447 | .data = &ipv4_devconf.log_martians, | |
1448 | .maxlen = sizeof(int), | |
1449 | .mode = 0644, | |
1450 | .proc_handler = &proc_dointvec, | |
1451 | }, | |
1452 | { | |
1453 | .ctl_name = NET_IPV4_CONF_TAG, | |
1454 | .procname = "tag", | |
1455 | .data = &ipv4_devconf.tag, | |
1456 | .maxlen = sizeof(int), | |
1457 | .mode = 0644, | |
1458 | .proc_handler = &proc_dointvec, | |
1459 | }, | |
1460 | { | |
1461 | .ctl_name = NET_IPV4_CONF_ARPFILTER, | |
1462 | .procname = "arp_filter", | |
1463 | .data = &ipv4_devconf.arp_filter, | |
1464 | .maxlen = sizeof(int), | |
1465 | .mode = 0644, | |
1466 | .proc_handler = &proc_dointvec, | |
1467 | }, | |
1468 | { | |
1469 | .ctl_name = NET_IPV4_CONF_ARP_ANNOUNCE, | |
1470 | .procname = "arp_announce", | |
1471 | .data = &ipv4_devconf.arp_announce, | |
1472 | .maxlen = sizeof(int), | |
1473 | .mode = 0644, | |
1474 | .proc_handler = &proc_dointvec, | |
1475 | }, | |
1476 | { | |
1477 | .ctl_name = NET_IPV4_CONF_ARP_IGNORE, | |
1478 | .procname = "arp_ignore", | |
1479 | .data = &ipv4_devconf.arp_ignore, | |
1480 | .maxlen = sizeof(int), | |
abd596a4 NH |
1481 | .mode = 0644, |
1482 | .proc_handler = &proc_dointvec, | |
1483 | }, | |
1484 | { | |
1485 | .ctl_name = NET_IPV4_CONF_ARP_ACCEPT, | |
1486 | .procname = "arp_accept", | |
1487 | .data = &ipv4_devconf.arp_accept, | |
1488 | .maxlen = sizeof(int), | |
1da177e4 LT |
1489 | .mode = 0644, |
1490 | .proc_handler = &proc_dointvec, | |
1491 | }, | |
1492 | { | |
1493 | .ctl_name = NET_IPV4_CONF_NOXFRM, | |
1494 | .procname = "disable_xfrm", | |
1495 | .data = &ipv4_devconf.no_xfrm, | |
1496 | .maxlen = sizeof(int), | |
1497 | .mode = 0644, | |
1498 | .proc_handler = &ipv4_doint_and_flush, | |
1499 | .strategy = &ipv4_doint_and_flush_strategy, | |
1500 | }, | |
1501 | { | |
1502 | .ctl_name = NET_IPV4_CONF_NOPOLICY, | |
1503 | .procname = "disable_policy", | |
1504 | .data = &ipv4_devconf.no_policy, | |
1505 | .maxlen = sizeof(int), | |
1506 | .mode = 0644, | |
1507 | .proc_handler = &ipv4_doint_and_flush, | |
1508 | .strategy = &ipv4_doint_and_flush_strategy, | |
1509 | }, | |
1510 | { | |
1511 | .ctl_name = NET_IPV4_CONF_FORCE_IGMP_VERSION, | |
1512 | .procname = "force_igmp_version", | |
1513 | .data = &ipv4_devconf.force_igmp_version, | |
1514 | .maxlen = sizeof(int), | |
1515 | .mode = 0644, | |
8f937c60 HW |
1516 | .proc_handler = &ipv4_doint_and_flush, |
1517 | .strategy = &ipv4_doint_and_flush_strategy, | |
1518 | }, | |
1519 | { | |
1520 | .ctl_name = NET_IPV4_CONF_PROMOTE_SECONDARIES, | |
1521 | .procname = "promote_secondaries", | |
1522 | .data = &ipv4_devconf.promote_secondaries, | |
1523 | .maxlen = sizeof(int), | |
1524 | .mode = 0644, | |
1da177e4 LT |
1525 | .proc_handler = &ipv4_doint_and_flush, |
1526 | .strategy = &ipv4_doint_and_flush_strategy, | |
1527 | }, | |
1528 | }, | |
1529 | .devinet_dev = { | |
1530 | { | |
1531 | .ctl_name = NET_PROTO_CONF_ALL, | |
1532 | .procname = "all", | |
1533 | .mode = 0555, | |
1534 | .child = devinet_sysctl.devinet_vars, | |
1535 | }, | |
1536 | }, | |
1537 | .devinet_conf_dir = { | |
1538 | { | |
1539 | .ctl_name = NET_IPV4_CONF, | |
1540 | .procname = "conf", | |
1541 | .mode = 0555, | |
1542 | .child = devinet_sysctl.devinet_dev, | |
1543 | }, | |
1544 | }, | |
1545 | .devinet_proto_dir = { | |
1546 | { | |
1547 | .ctl_name = NET_IPV4, | |
1548 | .procname = "ipv4", | |
1549 | .mode = 0555, | |
1550 | .child = devinet_sysctl.devinet_conf_dir, | |
1551 | }, | |
1552 | }, | |
1553 | .devinet_root_dir = { | |
1554 | { | |
1555 | .ctl_name = CTL_NET, | |
1556 | .procname = "net", | |
1557 | .mode = 0555, | |
1558 | .child = devinet_sysctl.devinet_proto_dir, | |
1559 | }, | |
1560 | }, | |
1561 | }; | |
1562 | ||
1563 | static void devinet_sysctl_register(struct in_device *in_dev, | |
1564 | struct ipv4_devconf *p) | |
1565 | { | |
1566 | int i; | |
1567 | struct net_device *dev = in_dev ? in_dev->dev : NULL; | |
42e5ea46 ACM |
1568 | struct devinet_sysctl_table *t = kmemdup(&devinet_sysctl, sizeof(*t), |
1569 | GFP_KERNEL); | |
1da177e4 LT |
1570 | char *dev_name = NULL; |
1571 | ||
1572 | if (!t) | |
1573 | return; | |
1da177e4 LT |
1574 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1575 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
1576 | t->devinet_vars[i].de = NULL; | |
1577 | } | |
1578 | ||
1579 | if (dev) { | |
1580 | dev_name = dev->name; | |
1581 | t->devinet_dev[0].ctl_name = dev->ifindex; | |
1582 | } else { | |
1583 | dev_name = "default"; | |
1584 | t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; | |
1585 | } | |
1586 | ||
1587 | /* | |
1588 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1589 | * by sysctl and we wouldn't want anyone to change it under our feet | |
1590 | * (see SIOCSIFNAME). | |
1591 | */ | |
543537bd | 1592 | dev_name = kstrdup(dev_name, GFP_KERNEL); |
1da177e4 LT |
1593 | if (!dev_name) |
1594 | goto free; | |
1595 | ||
1596 | t->devinet_dev[0].procname = dev_name; | |
1597 | t->devinet_dev[0].child = t->devinet_vars; | |
1598 | t->devinet_dev[0].de = NULL; | |
1599 | t->devinet_conf_dir[0].child = t->devinet_dev; | |
1600 | t->devinet_conf_dir[0].de = NULL; | |
1601 | t->devinet_proto_dir[0].child = t->devinet_conf_dir; | |
1602 | t->devinet_proto_dir[0].de = NULL; | |
1603 | t->devinet_root_dir[0].child = t->devinet_proto_dir; | |
1604 | t->devinet_root_dir[0].de = NULL; | |
1605 | ||
1606 | t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0); | |
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, 0); | |
1641 | devinet_sysctl_register(NULL, &ipv4_devconf_dflt); | |
1642 | #endif | |
1643 | } | |
1644 | ||
1da177e4 LT |
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); |