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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> | |
1da177e4 LT |
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> | |
1823730f | 45 | #include <linux/if_addr.h> |
1da177e4 LT |
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 | ||
14c85021 | 61 | #include <net/arp.h> |
1da177e4 LT |
62 | #include <net/ip.h> |
63 | #include <net/route.h> | |
64 | #include <net/ip_fib.h> | |
5c753978 | 65 | #include <net/netlink.h> |
1da177e4 LT |
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 | ||
5c753978 TG |
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 }, | |
5176f91e | 87 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c753978 TG |
88 | }; |
89 | ||
d6062cbb | 90 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 91 | |
e041c683 | 92 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
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 | { | |
0da974f4 | 105 | struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); |
1da177e4 LT |
106 | |
107 | if (ifa) { | |
1da177e4 LT |
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 | ||
0da974f4 | 151 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
152 | if (!in_dev) |
153 | goto out; | |
1da177e4 LT |
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 | ||
30c4cf57 | 167 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 168 | in_dev_hold(in_dev); |
1da177e4 LT |
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); | |
483479ec | 176 | |
30c4cf57 DS |
177 | /* we can receive as soon as ip_ptr is set -- do this last */ |
178 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 179 | out: |
1da177e4 LT |
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 | ||
ff428d72 | 228 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
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 | ||
d6062cbb TG |
243 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
244 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 245 | { |
8f937c60 | 246 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
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); | |
1da177e4 LT |
251 | |
252 | ASSERT_RTNL(); | |
253 | ||
e905a9ed | 254 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
255 | * unless alias promotion is set |
256 | **/ | |
1da177e4 LT |
257 | |
258 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
259 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
260 | ||
261 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 262 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
263 | ifa1->ifa_scope <= ifa->ifa_scope) |
264 | last_prim = ifa; | |
265 | ||
1da177e4 LT |
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; | |
0ff60a45 | 270 | prev_prom = ifa; |
1da177e4 LT |
271 | continue; |
272 | } | |
273 | ||
0ff60a45 | 274 | if (!do_promote) { |
8f937c60 | 275 | *ifap1 = ifa->ifa_next; |
1da177e4 | 276 | |
d6062cbb | 277 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
278 | blocking_notifier_call_chain(&inetaddr_chain, |
279 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
280 | inet_free_ifa(ifa); |
281 | } else { | |
282 | promote = ifa; | |
283 | break; | |
284 | } | |
1da177e4 LT |
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 | */ | |
d6062cbb | 302 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 303 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 304 | |
0ff60a45 JHS |
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 | } | |
8f937c60 | 312 | |
8f937c60 | 313 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 314 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
315 | blocking_notifier_call_chain(&inetaddr_chain, |
316 | NETDEV_UP, promote); | |
0ff60a45 JHS |
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); | |
8f937c60 | 330 | } |
1da177e4 LT |
331 | } |
332 | ||
d6062cbb TG |
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) | |
1da177e4 LT |
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 */ | |
d6062cbb | 385 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 386 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
387 | |
388 | return 0; | |
389 | } | |
390 | ||
d6062cbb TG |
391 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
392 | { | |
393 | return __inet_insert_ifa(ifa, NULL, 0); | |
394 | } | |
395 | ||
1da177e4 LT |
396 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
397 | { | |
e5ed6399 | 398 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
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 | ||
60cad5da AV |
433 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
434 | __be32 mask) | |
1da177e4 LT |
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 | { | |
dfdd5fd4 | 447 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 448 | struct in_device *in_dev; |
dfdd5fd4 | 449 | struct ifaddrmsg *ifm; |
1da177e4 | 450 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 451 | int err = -EINVAL; |
1da177e4 LT |
452 | |
453 | ASSERT_RTNL(); | |
454 | ||
dfdd5fd4 TG |
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 | ||
1da177e4 LT |
466 | __in_dev_put(in_dev); |
467 | ||
468 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
469 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 470 | if (tb[IFA_LOCAL] && |
a7a628c4 | 471 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
472 | continue; |
473 | ||
474 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 475 | continue; |
dfdd5fd4 TG |
476 | |
477 | if (tb[IFA_ADDRESS] && | |
478 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 479 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
480 | continue; |
481 | ||
d6062cbb | 482 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
483 | return 0; |
484 | } | |
dfdd5fd4 TG |
485 | |
486 | err = -EADDRNOTAVAIL; | |
487 | errout: | |
488 | return err; | |
1da177e4 LT |
489 | } |
490 | ||
5c753978 | 491 | static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh) |
1da177e4 | 492 | { |
5c753978 TG |
493 | struct nlattr *tb[IFA_MAX+1]; |
494 | struct in_ifaddr *ifa; | |
495 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
496 | struct net_device *dev; |
497 | struct in_device *in_dev; | |
5c753978 | 498 | int err = -EINVAL; |
1da177e4 | 499 | |
5c753978 TG |
500 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
501 | if (err < 0) | |
502 | goto errout; | |
1da177e4 | 503 | |
5c753978 | 504 | ifm = nlmsg_data(nlh); |
c4e38f41 EP |
505 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) { |
506 | err = -EINVAL; | |
5c753978 | 507 | goto errout; |
c4e38f41 | 508 | } |
1da177e4 | 509 | |
5c753978 TG |
510 | dev = __dev_get_by_index(ifm->ifa_index); |
511 | if (dev == NULL) { | |
512 | err = -ENODEV; | |
513 | goto errout; | |
514 | } | |
1da177e4 | 515 | |
5c753978 TG |
516 | in_dev = __in_dev_get_rtnl(dev); |
517 | if (in_dev == NULL) { | |
1da177e4 | 518 | in_dev = inetdev_init(dev); |
5c753978 TG |
519 | if (in_dev == NULL) { |
520 | err = -ENOBUFS; | |
521 | goto errout; | |
522 | } | |
1da177e4 LT |
523 | } |
524 | ||
5c753978 TG |
525 | ifa = inet_alloc_ifa(); |
526 | if (ifa == NULL) { | |
527 | /* | |
528 | * A potential indev allocation can be left alive, it stays | |
529 | * assigned to its device and is destroy with it. | |
530 | */ | |
531 | err = -ENOBUFS; | |
532 | goto errout; | |
533 | } | |
534 | ||
535 | in_dev_hold(in_dev); | |
536 | ||
537 | if (tb[IFA_ADDRESS] == NULL) | |
538 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 539 | |
1da177e4 LT |
540 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
541 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
542 | ifa->ifa_flags = ifm->ifa_flags; |
543 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
544 | ifa->ifa_dev = in_dev; |
545 | ||
a7a628c4 AV |
546 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
547 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
548 | |
549 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 550 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 TG |
551 | |
552 | if (tb[IFA_ANYCAST]) | |
a7a628c4 | 553 | ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]); |
5c753978 TG |
554 | |
555 | if (tb[IFA_LABEL]) | |
556 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
557 | else |
558 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
559 | ||
5c753978 TG |
560 | return ifa; |
561 | ||
562 | errout: | |
563 | return ERR_PTR(err); | |
564 | } | |
565 | ||
566 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
567 | { | |
568 | struct in_ifaddr *ifa; | |
569 | ||
570 | ASSERT_RTNL(); | |
571 | ||
572 | ifa = rtm_to_ifaddr(nlh); | |
573 | if (IS_ERR(ifa)) | |
574 | return PTR_ERR(ifa); | |
575 | ||
d6062cbb | 576 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
577 | } |
578 | ||
579 | /* | |
580 | * Determine a default network mask, based on the IP address. | |
581 | */ | |
582 | ||
714e85be | 583 | static __inline__ int inet_abc_len(__be32 addr) |
1da177e4 LT |
584 | { |
585 | int rc = -1; /* Something else, probably a multicast. */ | |
586 | ||
e905a9ed YH |
587 | if (ZERONET(addr)) |
588 | rc = 0; | |
1da177e4 | 589 | else { |
714e85be | 590 | __u32 haddr = ntohl(addr); |
1da177e4 | 591 | |
714e85be | 592 | if (IN_CLASSA(haddr)) |
1da177e4 | 593 | rc = 8; |
714e85be | 594 | else if (IN_CLASSB(haddr)) |
1da177e4 | 595 | rc = 16; |
714e85be | 596 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
597 | rc = 24; |
598 | } | |
599 | ||
e905a9ed | 600 | return rc; |
1da177e4 LT |
601 | } |
602 | ||
603 | ||
604 | int devinet_ioctl(unsigned int cmd, void __user *arg) | |
605 | { | |
606 | struct ifreq ifr; | |
607 | struct sockaddr_in sin_orig; | |
608 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
609 | struct in_device *in_dev; | |
610 | struct in_ifaddr **ifap = NULL; | |
611 | struct in_ifaddr *ifa = NULL; | |
612 | struct net_device *dev; | |
613 | char *colon; | |
614 | int ret = -EFAULT; | |
615 | int tryaddrmatch = 0; | |
616 | ||
617 | /* | |
618 | * Fetch the caller's info block into kernel space | |
619 | */ | |
620 | ||
621 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
622 | goto out; | |
623 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
624 | ||
625 | /* save original address for comparison */ | |
626 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
627 | ||
628 | colon = strchr(ifr.ifr_name, ':'); | |
629 | if (colon) | |
630 | *colon = 0; | |
631 | ||
632 | #ifdef CONFIG_KMOD | |
633 | dev_load(ifr.ifr_name); | |
634 | #endif | |
635 | ||
132adf54 | 636 | switch (cmd) { |
1da177e4 LT |
637 | case SIOCGIFADDR: /* Get interface address */ |
638 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
639 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
640 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
641 | /* Note that these ioctls will not sleep, | |
642 | so that we do not impose a lock. | |
643 | One day we will be forced to put shlock here (I mean SMP) | |
644 | */ | |
645 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
646 | memset(sin, 0, sizeof(*sin)); | |
647 | sin->sin_family = AF_INET; | |
648 | break; | |
649 | ||
650 | case SIOCSIFFLAGS: | |
651 | ret = -EACCES; | |
652 | if (!capable(CAP_NET_ADMIN)) | |
653 | goto out; | |
654 | break; | |
655 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
656 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
657 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
658 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
659 | ret = -EACCES; | |
660 | if (!capable(CAP_NET_ADMIN)) | |
661 | goto out; | |
662 | ret = -EINVAL; | |
663 | if (sin->sin_family != AF_INET) | |
664 | goto out; | |
665 | break; | |
666 | default: | |
667 | ret = -EINVAL; | |
668 | goto out; | |
669 | } | |
670 | ||
671 | rtnl_lock(); | |
672 | ||
673 | ret = -ENODEV; | |
674 | if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL) | |
675 | goto done; | |
676 | ||
677 | if (colon) | |
678 | *colon = ':'; | |
679 | ||
e5ed6399 | 680 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
681 | if (tryaddrmatch) { |
682 | /* Matthias Andree */ | |
683 | /* compare label and address (4.4BSD style) */ | |
684 | /* note: we only do this for a limited set of ioctls | |
685 | and only if the original address family was AF_INET. | |
686 | This is checked above. */ | |
687 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
688 | ifap = &ifa->ifa_next) { | |
689 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
690 | sin_orig.sin_addr.s_addr == | |
691 | ifa->ifa_address) { | |
692 | break; /* found */ | |
693 | } | |
694 | } | |
695 | } | |
696 | /* we didn't get a match, maybe the application is | |
697 | 4.3BSD-style and passed in junk so we fall back to | |
698 | comparing just the label */ | |
699 | if (!ifa) { | |
700 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
701 | ifap = &ifa->ifa_next) | |
702 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
703 | break; | |
704 | } | |
705 | } | |
706 | ||
707 | ret = -EADDRNOTAVAIL; | |
708 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
709 | goto done; | |
710 | ||
132adf54 | 711 | switch (cmd) { |
1da177e4 LT |
712 | case SIOCGIFADDR: /* Get interface address */ |
713 | sin->sin_addr.s_addr = ifa->ifa_local; | |
714 | goto rarok; | |
715 | ||
716 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
717 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
718 | goto rarok; | |
719 | ||
720 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
721 | sin->sin_addr.s_addr = ifa->ifa_address; | |
722 | goto rarok; | |
723 | ||
724 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
725 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
726 | goto rarok; | |
727 | ||
728 | case SIOCSIFFLAGS: | |
729 | if (colon) { | |
730 | ret = -EADDRNOTAVAIL; | |
731 | if (!ifa) | |
732 | break; | |
733 | ret = 0; | |
734 | if (!(ifr.ifr_flags & IFF_UP)) | |
735 | inet_del_ifa(in_dev, ifap, 1); | |
736 | break; | |
737 | } | |
738 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
739 | break; | |
740 | ||
741 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
742 | ret = -EINVAL; | |
743 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
744 | break; | |
745 | ||
746 | if (!ifa) { | |
747 | ret = -ENOBUFS; | |
748 | if ((ifa = inet_alloc_ifa()) == NULL) | |
749 | break; | |
750 | if (colon) | |
751 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
752 | else | |
753 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
754 | } else { | |
755 | ret = 0; | |
756 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
757 | break; | |
758 | inet_del_ifa(in_dev, ifap, 0); | |
759 | ifa->ifa_broadcast = 0; | |
760 | ifa->ifa_anycast = 0; | |
761 | } | |
762 | ||
763 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
764 | ||
765 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
766 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
767 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
768 | if ((dev->flags & IFF_BROADCAST) && | |
769 | ifa->ifa_prefixlen < 31) | |
770 | ifa->ifa_broadcast = ifa->ifa_address | | |
771 | ~ifa->ifa_mask; | |
772 | } else { | |
773 | ifa->ifa_prefixlen = 32; | |
774 | ifa->ifa_mask = inet_make_mask(32); | |
775 | } | |
776 | ret = inet_set_ifa(dev, ifa); | |
777 | break; | |
778 | ||
779 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
780 | ret = 0; | |
781 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
782 | inet_del_ifa(in_dev, ifap, 0); | |
783 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
784 | inet_insert_ifa(ifa); | |
785 | } | |
786 | break; | |
787 | ||
788 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
789 | ret = 0; | |
790 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
791 | break; | |
792 | ret = -EINVAL; | |
793 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
794 | break; | |
795 | ret = 0; | |
796 | inet_del_ifa(in_dev, ifap, 0); | |
797 | ifa->ifa_address = sin->sin_addr.s_addr; | |
798 | inet_insert_ifa(ifa); | |
799 | break; | |
800 | ||
801 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
802 | ||
803 | /* | |
804 | * The mask we set must be legal. | |
805 | */ | |
806 | ret = -EINVAL; | |
807 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
808 | break; | |
809 | ret = 0; | |
810 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 811 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
812 | inet_del_ifa(in_dev, ifap, 0); |
813 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
814 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
815 | ||
816 | /* See if current broadcast address matches | |
817 | * with current netmask, then recalculate | |
818 | * the broadcast address. Otherwise it's a | |
819 | * funny address, so don't touch it since | |
820 | * the user seems to know what (s)he's doing... | |
821 | */ | |
822 | if ((dev->flags & IFF_BROADCAST) && | |
823 | (ifa->ifa_prefixlen < 31) && | |
824 | (ifa->ifa_broadcast == | |
dcab5e1e | 825 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
826 | ifa->ifa_broadcast = (ifa->ifa_local | |
827 | ~sin->sin_addr.s_addr); | |
828 | } | |
829 | inet_insert_ifa(ifa); | |
830 | } | |
831 | break; | |
832 | } | |
833 | done: | |
834 | rtnl_unlock(); | |
835 | out: | |
836 | return ret; | |
837 | rarok: | |
838 | rtnl_unlock(); | |
839 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
840 | goto out; | |
841 | } | |
842 | ||
843 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
844 | { | |
e5ed6399 | 845 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
846 | struct in_ifaddr *ifa; |
847 | struct ifreq ifr; | |
848 | int done = 0; | |
849 | ||
850 | if (!in_dev || (ifa = in_dev->ifa_list) == NULL) | |
851 | goto out; | |
852 | ||
853 | for (; ifa; ifa = ifa->ifa_next) { | |
854 | if (!buf) { | |
855 | done += sizeof(ifr); | |
856 | continue; | |
857 | } | |
858 | if (len < (int) sizeof(ifr)) | |
859 | break; | |
860 | memset(&ifr, 0, sizeof(struct ifreq)); | |
861 | if (ifa->ifa_label) | |
862 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
863 | else | |
864 | strcpy(ifr.ifr_name, dev->name); | |
865 | ||
866 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
867 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
868 | ifa->ifa_local; | |
869 | ||
870 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
871 | done = -EFAULT; | |
872 | break; | |
873 | } | |
874 | buf += sizeof(struct ifreq); | |
875 | len -= sizeof(struct ifreq); | |
876 | done += sizeof(struct ifreq); | |
877 | } | |
878 | out: | |
879 | return done; | |
880 | } | |
881 | ||
a61ced5d | 882 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 883 | { |
a61ced5d | 884 | __be32 addr = 0; |
1da177e4 LT |
885 | struct in_device *in_dev; |
886 | ||
887 | rcu_read_lock(); | |
e5ed6399 | 888 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
889 | if (!in_dev) |
890 | goto no_in_dev; | |
891 | ||
892 | for_primary_ifa(in_dev) { | |
893 | if (ifa->ifa_scope > scope) | |
894 | continue; | |
895 | if (!dst || inet_ifa_match(dst, ifa)) { | |
896 | addr = ifa->ifa_local; | |
897 | break; | |
898 | } | |
899 | if (!addr) | |
900 | addr = ifa->ifa_local; | |
901 | } endfor_ifa(in_dev); | |
902 | no_in_dev: | |
903 | rcu_read_unlock(); | |
904 | ||
905 | if (addr) | |
906 | goto out; | |
907 | ||
908 | /* Not loopback addresses on loopback should be preferred | |
909 | in this case. It is importnat that lo is the first interface | |
910 | in dev_base list. | |
911 | */ | |
912 | read_lock(&dev_base_lock); | |
913 | rcu_read_lock(); | |
914 | for (dev = dev_base; dev; dev = dev->next) { | |
e5ed6399 | 915 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) |
1da177e4 LT |
916 | continue; |
917 | ||
918 | for_primary_ifa(in_dev) { | |
919 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
920 | ifa->ifa_scope <= scope) { | |
921 | addr = ifa->ifa_local; | |
922 | goto out_unlock_both; | |
923 | } | |
924 | } endfor_ifa(in_dev); | |
925 | } | |
926 | out_unlock_both: | |
927 | read_unlock(&dev_base_lock); | |
928 | rcu_read_unlock(); | |
929 | out: | |
930 | return addr; | |
931 | } | |
932 | ||
60cad5da AV |
933 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
934 | __be32 local, int scope) | |
1da177e4 LT |
935 | { |
936 | int same = 0; | |
a144ea4b | 937 | __be32 addr = 0; |
1da177e4 LT |
938 | |
939 | for_ifa(in_dev) { | |
940 | if (!addr && | |
941 | (local == ifa->ifa_local || !local) && | |
942 | ifa->ifa_scope <= scope) { | |
943 | addr = ifa->ifa_local; | |
944 | if (same) | |
945 | break; | |
946 | } | |
947 | if (!same) { | |
948 | same = (!local || inet_ifa_match(local, ifa)) && | |
949 | (!dst || inet_ifa_match(dst, ifa)); | |
950 | if (same && addr) { | |
951 | if (local || !dst) | |
952 | break; | |
953 | /* Is the selected addr into dst subnet? */ | |
954 | if (inet_ifa_match(addr, ifa)) | |
955 | break; | |
956 | /* No, then can we use new local src? */ | |
957 | if (ifa->ifa_scope <= scope) { | |
958 | addr = ifa->ifa_local; | |
959 | break; | |
960 | } | |
961 | /* search for large dst subnet for addr */ | |
962 | same = 0; | |
963 | } | |
964 | } | |
965 | } endfor_ifa(in_dev); | |
966 | ||
967 | return same? addr : 0; | |
968 | } | |
969 | ||
970 | /* | |
971 | * Confirm that local IP address exists using wildcards: | |
972 | * - dev: only on this interface, 0=any interface | |
973 | * - dst: only in the same subnet as dst, 0=any dst | |
974 | * - local: address, 0=autoselect the local address | |
975 | * - scope: maximum allowed scope value for the local address | |
976 | */ | |
60cad5da | 977 | __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope) |
1da177e4 | 978 | { |
60cad5da | 979 | __be32 addr = 0; |
1da177e4 LT |
980 | struct in_device *in_dev; |
981 | ||
982 | if (dev) { | |
983 | rcu_read_lock(); | |
e5ed6399 | 984 | if ((in_dev = __in_dev_get_rcu(dev))) |
1da177e4 LT |
985 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
986 | rcu_read_unlock(); | |
987 | ||
988 | return addr; | |
989 | } | |
990 | ||
991 | read_lock(&dev_base_lock); | |
992 | rcu_read_lock(); | |
993 | for (dev = dev_base; dev; dev = dev->next) { | |
e5ed6399 | 994 | if ((in_dev = __in_dev_get_rcu(dev))) { |
1da177e4 LT |
995 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
996 | if (addr) | |
997 | break; | |
998 | } | |
999 | } | |
1000 | rcu_read_unlock(); | |
1001 | read_unlock(&dev_base_lock); | |
1002 | ||
1003 | return addr; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Device notifier | |
1008 | */ | |
1009 | ||
1010 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1011 | { | |
e041c683 | 1012 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 LT |
1013 | } |
1014 | ||
1015 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1016 | { | |
e041c683 | 1017 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | /* Rename ifa_labels for a device name change. Make some effort to preserve existing | |
1021 | * alias numbering and to create unique labels if possible. | |
1022 | */ | |
1023 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1024 | { |
1da177e4 LT |
1025 | struct in_ifaddr *ifa; |
1026 | int named = 0; | |
1027 | ||
e905a9ed YH |
1028 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1029 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1030 | |
1031 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1032 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 LT |
1033 | if (named++ == 0) |
1034 | continue; | |
1035 | dot = strchr(ifa->ifa_label, ':'); | |
e905a9ed YH |
1036 | if (dot == NULL) { |
1037 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1038 | dot = old; |
1039 | } | |
e905a9ed YH |
1040 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { |
1041 | strcat(ifa->ifa_label, dot); | |
1042 | } else { | |
1043 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
1044 | } | |
1045 | } | |
1046 | } | |
1da177e4 LT |
1047 | |
1048 | /* Called only under RTNL semaphore */ | |
1049 | ||
1050 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1051 | void *ptr) | |
1052 | { | |
1053 | struct net_device *dev = ptr; | |
e5ed6399 | 1054 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1055 | |
1056 | ASSERT_RTNL(); | |
1057 | ||
1058 | if (!in_dev) { | |
8030f544 | 1059 | if (event == NETDEV_REGISTER) { |
1da177e4 LT |
1060 | in_dev = inetdev_init(dev); |
1061 | if (!in_dev) | |
1062 | panic("devinet: Failed to create loopback\n"); | |
8030f544 HX |
1063 | if (dev == &loopback_dev) { |
1064 | in_dev->cnf.no_xfrm = 1; | |
1065 | in_dev->cnf.no_policy = 1; | |
1066 | } | |
1da177e4 LT |
1067 | } |
1068 | goto out; | |
1069 | } | |
1070 | ||
1071 | switch (event) { | |
1072 | case NETDEV_REGISTER: | |
1073 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1074 | dev->ip_ptr = NULL; | |
1075 | break; | |
1076 | case NETDEV_UP: | |
1077 | if (dev->mtu < 68) | |
1078 | break; | |
1079 | if (dev == &loopback_dev) { | |
1080 | struct in_ifaddr *ifa; | |
1081 | if ((ifa = inet_alloc_ifa()) != NULL) { | |
1082 | ifa->ifa_local = | |
1083 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1084 | ifa->ifa_prefixlen = 8; | |
1085 | ifa->ifa_mask = inet_make_mask(8); | |
1086 | in_dev_hold(in_dev); | |
1087 | ifa->ifa_dev = in_dev; | |
1088 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1089 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1090 | inet_insert_ifa(ifa); | |
1091 | } | |
1092 | } | |
1093 | ip_mc_up(in_dev); | |
1094 | break; | |
1095 | case NETDEV_DOWN: | |
1096 | ip_mc_down(in_dev); | |
1097 | break; | |
1098 | case NETDEV_CHANGEMTU: | |
1099 | if (dev->mtu >= 68) | |
1100 | break; | |
1101 | /* MTU falled under 68, disable IP */ | |
1102 | case NETDEV_UNREGISTER: | |
1103 | inetdev_destroy(in_dev); | |
1104 | break; | |
1105 | case NETDEV_CHANGENAME: | |
1106 | /* Do not notify about label change, this event is | |
1107 | * not interesting to applications using netlink. | |
1108 | */ | |
1109 | inetdev_changename(dev, in_dev); | |
1110 | ||
1111 | #ifdef CONFIG_SYSCTL | |
1112 | devinet_sysctl_unregister(&in_dev->cnf); | |
1113 | neigh_sysctl_unregister(in_dev->arp_parms); | |
1114 | neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, | |
1115 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
1116 | devinet_sysctl_register(in_dev, &in_dev->cnf); | |
1117 | #endif | |
1118 | break; | |
1119 | } | |
1120 | out: | |
1121 | return NOTIFY_DONE; | |
1122 | } | |
1123 | ||
1124 | static struct notifier_block ip_netdev_notifier = { | |
1125 | .notifier_call =inetdev_event, | |
1126 | }; | |
1127 | ||
339bf98f TG |
1128 | static inline size_t inet_nlmsg_size(void) |
1129 | { | |
1130 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1131 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1132 | + nla_total_size(4) /* IFA_LOCAL */ | |
1133 | + nla_total_size(4) /* IFA_BROADCAST */ | |
1134 | + nla_total_size(4) /* IFA_ANYCAST */ | |
1135 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ | |
1136 | } | |
1137 | ||
1da177e4 | 1138 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1139 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1140 | { |
1141 | struct ifaddrmsg *ifm; | |
1142 | struct nlmsghdr *nlh; | |
1da177e4 | 1143 | |
47f68512 TG |
1144 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1145 | if (nlh == NULL) | |
26932566 | 1146 | return -EMSGSIZE; |
47f68512 TG |
1147 | |
1148 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1149 | ifm->ifa_family = AF_INET; |
1150 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1151 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1152 | ifm->ifa_scope = ifa->ifa_scope; | |
1153 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1154 | |
1da177e4 | 1155 | if (ifa->ifa_address) |
a7a628c4 | 1156 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1157 | |
1da177e4 | 1158 | if (ifa->ifa_local) |
a7a628c4 | 1159 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1160 | |
1da177e4 | 1161 | if (ifa->ifa_broadcast) |
a7a628c4 | 1162 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1163 | |
1da177e4 | 1164 | if (ifa->ifa_anycast) |
a7a628c4 | 1165 | NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast); |
47f68512 | 1166 | |
1da177e4 | 1167 | if (ifa->ifa_label[0]) |
47f68512 | 1168 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1169 | |
47f68512 TG |
1170 | return nlmsg_end(skb, nlh); |
1171 | ||
1172 | nla_put_failure: | |
26932566 PM |
1173 | nlmsg_cancel(skb, nlh); |
1174 | return -EMSGSIZE; | |
1da177e4 LT |
1175 | } |
1176 | ||
1177 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1178 | { | |
1179 | int idx, ip_idx; | |
1180 | struct net_device *dev; | |
1181 | struct in_device *in_dev; | |
1182 | struct in_ifaddr *ifa; | |
1183 | int s_ip_idx, s_idx = cb->args[0]; | |
1184 | ||
1185 | s_ip_idx = ip_idx = cb->args[1]; | |
1186 | read_lock(&dev_base_lock); | |
1187 | for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { | |
1188 | if (idx < s_idx) | |
1189 | continue; | |
1190 | if (idx > s_idx) | |
1191 | s_ip_idx = 0; | |
1192 | rcu_read_lock(); | |
e5ed6399 | 1193 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
1da177e4 LT |
1194 | rcu_read_unlock(); |
1195 | continue; | |
1196 | } | |
1197 | ||
1198 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1199 | ifa = ifa->ifa_next, ip_idx++) { | |
1200 | if (ip_idx < s_ip_idx) | |
1201 | continue; | |
1202 | if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, | |
1203 | cb->nlh->nlmsg_seq, | |
b6544c0b | 1204 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
1205 | rcu_read_unlock(); |
1206 | goto done; | |
1207 | } | |
1208 | } | |
1209 | rcu_read_unlock(); | |
1210 | } | |
1211 | ||
1212 | done: | |
1213 | read_unlock(&dev_base_lock); | |
1214 | cb->args[0] = idx; | |
1215 | cb->args[1] = ip_idx; | |
1216 | ||
1217 | return skb->len; | |
1218 | } | |
1219 | ||
d6062cbb TG |
1220 | static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh, |
1221 | u32 pid) | |
1da177e4 | 1222 | { |
47f68512 | 1223 | struct sk_buff *skb; |
d6062cbb TG |
1224 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1225 | int err = -ENOBUFS; | |
1da177e4 | 1226 | |
339bf98f | 1227 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1228 | if (skb == NULL) |
d6062cbb TG |
1229 | goto errout; |
1230 | ||
1231 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1232 | if (err < 0) { |
1233 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1234 | WARN_ON(err == -EMSGSIZE); | |
1235 | kfree_skb(skb); | |
1236 | goto errout; | |
1237 | } | |
d6062cbb TG |
1238 | err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1239 | errout: | |
1240 | if (err < 0) | |
1241 | rtnl_set_sk_err(RTNLGRP_IPV4_IFADDR, err); | |
1da177e4 LT |
1242 | } |
1243 | ||
db46edc6 TG |
1244 | static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = { |
1245 | [RTM_NEWADDR - RTM_BASE] = { .doit = inet_rtm_newaddr, }, | |
1246 | [RTM_DELADDR - RTM_BASE] = { .doit = inet_rtm_deladdr, }, | |
1247 | [RTM_GETADDR - RTM_BASE] = { .dumpit = inet_dump_ifaddr, }, | |
1248 | [RTM_NEWROUTE - RTM_BASE] = { .doit = inet_rtm_newroute, }, | |
1249 | [RTM_DELROUTE - RTM_BASE] = { .doit = inet_rtm_delroute, }, | |
1250 | [RTM_GETROUTE - RTM_BASE] = { .doit = inet_rtm_getroute, | |
1251 | .dumpit = inet_dump_fib, }, | |
1da177e4 | 1252 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
e1ef4bf2 | 1253 | [RTM_GETRULE - RTM_BASE] = { .dumpit = fib4_rules_dump, }, |
1da177e4 LT |
1254 | #endif |
1255 | }; | |
1256 | ||
1257 | #ifdef CONFIG_SYSCTL | |
1258 | ||
1259 | void inet_forward_change(void) | |
1260 | { | |
1261 | struct net_device *dev; | |
1262 | int on = ipv4_devconf.forwarding; | |
1263 | ||
1264 | ipv4_devconf.accept_redirects = !on; | |
1265 | ipv4_devconf_dflt.forwarding = on; | |
1266 | ||
1267 | read_lock(&dev_base_lock); | |
1268 | for (dev = dev_base; dev; dev = dev->next) { | |
1269 | struct in_device *in_dev; | |
1270 | rcu_read_lock(); | |
e5ed6399 | 1271 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
1272 | if (in_dev) |
1273 | in_dev->cnf.forwarding = on; | |
1274 | rcu_read_unlock(); | |
1275 | } | |
1276 | read_unlock(&dev_base_lock); | |
1277 | ||
1278 | rt_cache_flush(0); | |
1279 | } | |
1280 | ||
1281 | static int devinet_sysctl_forward(ctl_table *ctl, int write, | |
1282 | struct file* filp, void __user *buffer, | |
1283 | size_t *lenp, loff_t *ppos) | |
1284 | { | |
1285 | int *valp = ctl->data; | |
1286 | int val = *valp; | |
1287 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1288 | ||
1289 | if (write && *valp != val) { | |
1290 | if (valp == &ipv4_devconf.forwarding) | |
1291 | inet_forward_change(); | |
1292 | else if (valp != &ipv4_devconf_dflt.forwarding) | |
1293 | rt_cache_flush(0); | |
1294 | } | |
1295 | ||
1296 | return ret; | |
1297 | } | |
1298 | ||
1299 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
1300 | struct file* filp, void __user *buffer, | |
1301 | size_t *lenp, loff_t *ppos) | |
1302 | { | |
1303 | int *valp = ctl->data; | |
1304 | int val = *valp; | |
1305 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1306 | ||
1307 | if (write && *valp != val) | |
1308 | rt_cache_flush(0); | |
1309 | ||
1310 | return ret; | |
1311 | } | |
1312 | ||
1313 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
1314 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 1315 | void __user *newval, size_t newlen) |
1da177e4 LT |
1316 | { |
1317 | int *valp = table->data; | |
1318 | int new; | |
1319 | ||
1320 | if (!newval || !newlen) | |
1321 | return 0; | |
1322 | ||
1323 | if (newlen != sizeof(int)) | |
1324 | return -EINVAL; | |
1325 | ||
1326 | if (get_user(new, (int __user *)newval)) | |
1327 | return -EFAULT; | |
1328 | ||
1329 | if (new == *valp) | |
1330 | return 0; | |
1331 | ||
1332 | if (oldval && oldlenp) { | |
1333 | size_t len; | |
1334 | ||
1335 | if (get_user(len, oldlenp)) | |
1336 | return -EFAULT; | |
1337 | ||
1338 | if (len) { | |
1339 | if (len > table->maxlen) | |
1340 | len = table->maxlen; | |
1341 | if (copy_to_user(oldval, valp, len)) | |
1342 | return -EFAULT; | |
1343 | if (put_user(len, oldlenp)) | |
1344 | return -EFAULT; | |
1345 | } | |
1346 | } | |
1347 | ||
1348 | *valp = new; | |
1349 | rt_cache_flush(0); | |
1350 | return 1; | |
1351 | } | |
1352 | ||
1353 | ||
1354 | static struct devinet_sysctl_table { | |
1355 | struct ctl_table_header *sysctl_header; | |
1356 | ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; | |
1357 | ctl_table devinet_dev[2]; | |
1358 | ctl_table devinet_conf_dir[2]; | |
1359 | ctl_table devinet_proto_dir[2]; | |
1360 | ctl_table devinet_root_dir[2]; | |
1361 | } devinet_sysctl = { | |
1362 | .devinet_vars = { | |
1363 | { | |
1364 | .ctl_name = NET_IPV4_CONF_FORWARDING, | |
1365 | .procname = "forwarding", | |
1366 | .data = &ipv4_devconf.forwarding, | |
1367 | .maxlen = sizeof(int), | |
1368 | .mode = 0644, | |
1369 | .proc_handler = &devinet_sysctl_forward, | |
1370 | }, | |
1371 | { | |
1372 | .ctl_name = NET_IPV4_CONF_MC_FORWARDING, | |
1373 | .procname = "mc_forwarding", | |
1374 | .data = &ipv4_devconf.mc_forwarding, | |
1375 | .maxlen = sizeof(int), | |
1376 | .mode = 0444, | |
1377 | .proc_handler = &proc_dointvec, | |
1378 | }, | |
1379 | { | |
1380 | .ctl_name = NET_IPV4_CONF_ACCEPT_REDIRECTS, | |
1381 | .procname = "accept_redirects", | |
1382 | .data = &ipv4_devconf.accept_redirects, | |
1383 | .maxlen = sizeof(int), | |
1384 | .mode = 0644, | |
1385 | .proc_handler = &proc_dointvec, | |
1386 | }, | |
1387 | { | |
1388 | .ctl_name = NET_IPV4_CONF_SECURE_REDIRECTS, | |
1389 | .procname = "secure_redirects", | |
1390 | .data = &ipv4_devconf.secure_redirects, | |
1391 | .maxlen = sizeof(int), | |
1392 | .mode = 0644, | |
1393 | .proc_handler = &proc_dointvec, | |
1394 | }, | |
1395 | { | |
1396 | .ctl_name = NET_IPV4_CONF_SHARED_MEDIA, | |
1397 | .procname = "shared_media", | |
1398 | .data = &ipv4_devconf.shared_media, | |
1399 | .maxlen = sizeof(int), | |
1400 | .mode = 0644, | |
1401 | .proc_handler = &proc_dointvec, | |
1402 | }, | |
1403 | { | |
1404 | .ctl_name = NET_IPV4_CONF_RP_FILTER, | |
1405 | .procname = "rp_filter", | |
1406 | .data = &ipv4_devconf.rp_filter, | |
1407 | .maxlen = sizeof(int), | |
1408 | .mode = 0644, | |
1409 | .proc_handler = &proc_dointvec, | |
1410 | }, | |
1411 | { | |
1412 | .ctl_name = NET_IPV4_CONF_SEND_REDIRECTS, | |
1413 | .procname = "send_redirects", | |
1414 | .data = &ipv4_devconf.send_redirects, | |
1415 | .maxlen = sizeof(int), | |
1416 | .mode = 0644, | |
1417 | .proc_handler = &proc_dointvec, | |
1418 | }, | |
1419 | { | |
1420 | .ctl_name = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE, | |
1421 | .procname = "accept_source_route", | |
1422 | .data = &ipv4_devconf.accept_source_route, | |
1423 | .maxlen = sizeof(int), | |
1424 | .mode = 0644, | |
1425 | .proc_handler = &proc_dointvec, | |
1426 | }, | |
1427 | { | |
1428 | .ctl_name = NET_IPV4_CONF_PROXY_ARP, | |
1429 | .procname = "proxy_arp", | |
1430 | .data = &ipv4_devconf.proxy_arp, | |
1431 | .maxlen = sizeof(int), | |
1432 | .mode = 0644, | |
1433 | .proc_handler = &proc_dointvec, | |
1434 | }, | |
1435 | { | |
1436 | .ctl_name = NET_IPV4_CONF_MEDIUM_ID, | |
1437 | .procname = "medium_id", | |
1438 | .data = &ipv4_devconf.medium_id, | |
1439 | .maxlen = sizeof(int), | |
1440 | .mode = 0644, | |
1441 | .proc_handler = &proc_dointvec, | |
1442 | }, | |
1443 | { | |
1444 | .ctl_name = NET_IPV4_CONF_BOOTP_RELAY, | |
1445 | .procname = "bootp_relay", | |
1446 | .data = &ipv4_devconf.bootp_relay, | |
1447 | .maxlen = sizeof(int), | |
1448 | .mode = 0644, | |
1449 | .proc_handler = &proc_dointvec, | |
1450 | }, | |
1451 | { | |
1452 | .ctl_name = NET_IPV4_CONF_LOG_MARTIANS, | |
1453 | .procname = "log_martians", | |
1454 | .data = &ipv4_devconf.log_martians, | |
1455 | .maxlen = sizeof(int), | |
1456 | .mode = 0644, | |
1457 | .proc_handler = &proc_dointvec, | |
1458 | }, | |
1459 | { | |
1460 | .ctl_name = NET_IPV4_CONF_TAG, | |
1461 | .procname = "tag", | |
1462 | .data = &ipv4_devconf.tag, | |
1463 | .maxlen = sizeof(int), | |
1464 | .mode = 0644, | |
1465 | .proc_handler = &proc_dointvec, | |
1466 | }, | |
1467 | { | |
1468 | .ctl_name = NET_IPV4_CONF_ARPFILTER, | |
1469 | .procname = "arp_filter", | |
1470 | .data = &ipv4_devconf.arp_filter, | |
1471 | .maxlen = sizeof(int), | |
1472 | .mode = 0644, | |
1473 | .proc_handler = &proc_dointvec, | |
1474 | }, | |
1475 | { | |
1476 | .ctl_name = NET_IPV4_CONF_ARP_ANNOUNCE, | |
1477 | .procname = "arp_announce", | |
1478 | .data = &ipv4_devconf.arp_announce, | |
1479 | .maxlen = sizeof(int), | |
1480 | .mode = 0644, | |
1481 | .proc_handler = &proc_dointvec, | |
1482 | }, | |
1483 | { | |
1484 | .ctl_name = NET_IPV4_CONF_ARP_IGNORE, | |
1485 | .procname = "arp_ignore", | |
1486 | .data = &ipv4_devconf.arp_ignore, | |
1487 | .maxlen = sizeof(int), | |
abd596a4 NH |
1488 | .mode = 0644, |
1489 | .proc_handler = &proc_dointvec, | |
1490 | }, | |
1491 | { | |
1492 | .ctl_name = NET_IPV4_CONF_ARP_ACCEPT, | |
1493 | .procname = "arp_accept", | |
1494 | .data = &ipv4_devconf.arp_accept, | |
1495 | .maxlen = sizeof(int), | |
1da177e4 LT |
1496 | .mode = 0644, |
1497 | .proc_handler = &proc_dointvec, | |
1498 | }, | |
1499 | { | |
1500 | .ctl_name = NET_IPV4_CONF_NOXFRM, | |
1501 | .procname = "disable_xfrm", | |
1502 | .data = &ipv4_devconf.no_xfrm, | |
1503 | .maxlen = sizeof(int), | |
1504 | .mode = 0644, | |
1505 | .proc_handler = &ipv4_doint_and_flush, | |
1506 | .strategy = &ipv4_doint_and_flush_strategy, | |
1507 | }, | |
1508 | { | |
1509 | .ctl_name = NET_IPV4_CONF_NOPOLICY, | |
1510 | .procname = "disable_policy", | |
1511 | .data = &ipv4_devconf.no_policy, | |
1512 | .maxlen = sizeof(int), | |
1513 | .mode = 0644, | |
1514 | .proc_handler = &ipv4_doint_and_flush, | |
1515 | .strategy = &ipv4_doint_and_flush_strategy, | |
1516 | }, | |
1517 | { | |
1518 | .ctl_name = NET_IPV4_CONF_FORCE_IGMP_VERSION, | |
1519 | .procname = "force_igmp_version", | |
1520 | .data = &ipv4_devconf.force_igmp_version, | |
1521 | .maxlen = sizeof(int), | |
1522 | .mode = 0644, | |
8f937c60 HW |
1523 | .proc_handler = &ipv4_doint_and_flush, |
1524 | .strategy = &ipv4_doint_and_flush_strategy, | |
1525 | }, | |
1526 | { | |
1527 | .ctl_name = NET_IPV4_CONF_PROMOTE_SECONDARIES, | |
1528 | .procname = "promote_secondaries", | |
1529 | .data = &ipv4_devconf.promote_secondaries, | |
1530 | .maxlen = sizeof(int), | |
1531 | .mode = 0644, | |
1da177e4 LT |
1532 | .proc_handler = &ipv4_doint_and_flush, |
1533 | .strategy = &ipv4_doint_and_flush_strategy, | |
1534 | }, | |
1535 | }, | |
1536 | .devinet_dev = { | |
1537 | { | |
1538 | .ctl_name = NET_PROTO_CONF_ALL, | |
1539 | .procname = "all", | |
1540 | .mode = 0555, | |
1541 | .child = devinet_sysctl.devinet_vars, | |
1542 | }, | |
1543 | }, | |
1544 | .devinet_conf_dir = { | |
e905a9ed | 1545 | { |
1da177e4 LT |
1546 | .ctl_name = NET_IPV4_CONF, |
1547 | .procname = "conf", | |
1548 | .mode = 0555, | |
1549 | .child = devinet_sysctl.devinet_dev, | |
1550 | }, | |
1551 | }, | |
1552 | .devinet_proto_dir = { | |
1553 | { | |
1554 | .ctl_name = NET_IPV4, | |
1555 | .procname = "ipv4", | |
1556 | .mode = 0555, | |
1557 | .child = devinet_sysctl.devinet_conf_dir, | |
1558 | }, | |
1559 | }, | |
1560 | .devinet_root_dir = { | |
1561 | { | |
1562 | .ctl_name = CTL_NET, | |
1563 | .procname = "net", | |
1564 | .mode = 0555, | |
1565 | .child = devinet_sysctl.devinet_proto_dir, | |
1566 | }, | |
1567 | }, | |
1568 | }; | |
1569 | ||
1570 | static void devinet_sysctl_register(struct in_device *in_dev, | |
1571 | struct ipv4_devconf *p) | |
1572 | { | |
1573 | int i; | |
1574 | struct net_device *dev = in_dev ? in_dev->dev : NULL; | |
42e5ea46 ACM |
1575 | struct devinet_sysctl_table *t = kmemdup(&devinet_sysctl, sizeof(*t), |
1576 | GFP_KERNEL); | |
1da177e4 LT |
1577 | char *dev_name = NULL; |
1578 | ||
1579 | if (!t) | |
1580 | return; | |
1da177e4 LT |
1581 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1582 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
1da177e4 LT |
1583 | } |
1584 | ||
1585 | if (dev) { | |
e905a9ed | 1586 | dev_name = dev->name; |
1da177e4 LT |
1587 | t->devinet_dev[0].ctl_name = dev->ifindex; |
1588 | } else { | |
1589 | dev_name = "default"; | |
1590 | t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; | |
1591 | } | |
1592 | ||
e905a9ed YH |
1593 | /* |
1594 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1595 | * by sysctl and we wouldn't want anyone to change it under our feet |
1596 | * (see SIOCSIFNAME). | |
e905a9ed | 1597 | */ |
543537bd | 1598 | dev_name = kstrdup(dev_name, GFP_KERNEL); |
1da177e4 LT |
1599 | if (!dev_name) |
1600 | goto free; | |
1601 | ||
1602 | t->devinet_dev[0].procname = dev_name; | |
1603 | t->devinet_dev[0].child = t->devinet_vars; | |
1da177e4 | 1604 | t->devinet_conf_dir[0].child = t->devinet_dev; |
1da177e4 | 1605 | t->devinet_proto_dir[0].child = t->devinet_conf_dir; |
1da177e4 | 1606 | t->devinet_root_dir[0].child = t->devinet_proto_dir; |
1da177e4 | 1607 | |
0b4d4147 | 1608 | t->sysctl_header = register_sysctl_table(t->devinet_root_dir); |
1da177e4 LT |
1609 | if (!t->sysctl_header) |
1610 | goto free_procname; | |
1611 | ||
1612 | p->sysctl = t; | |
1613 | return; | |
1614 | ||
1615 | /* error path */ | |
1616 | free_procname: | |
1617 | kfree(dev_name); | |
1618 | free: | |
1619 | kfree(t); | |
1620 | return; | |
1621 | } | |
1622 | ||
1623 | static void devinet_sysctl_unregister(struct ipv4_devconf *p) | |
1624 | { | |
1625 | if (p->sysctl) { | |
1626 | struct devinet_sysctl_table *t = p->sysctl; | |
1627 | p->sysctl = NULL; | |
1628 | unregister_sysctl_table(t->sysctl_header); | |
1629 | kfree(t->devinet_dev[0].procname); | |
1630 | kfree(t); | |
1631 | } | |
1632 | } | |
1633 | #endif | |
1634 | ||
1635 | void __init devinet_init(void) | |
1636 | { | |
1637 | register_gifconf(PF_INET, inet_gifconf); | |
1638 | register_netdevice_notifier(&ip_netdev_notifier); | |
1639 | rtnetlink_links[PF_INET] = inet_rtnetlink_table; | |
1640 | #ifdef CONFIG_SYSCTL | |
1641 | devinet_sysctl.sysctl_header = | |
0b4d4147 | 1642 | register_sysctl_table(devinet_sysctl.devinet_root_dir); |
1da177e4 LT |
1643 | devinet_sysctl_register(NULL, &ipv4_devconf_dflt); |
1644 | #endif | |
1645 | } | |
1646 | ||
1da177e4 LT |
1647 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1648 | EXPORT_SYMBOL(inet_select_addr); | |
1649 | EXPORT_SYMBOL(inetdev_by_index); | |
1650 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
1651 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |