Commit | Line | Data |
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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> | |
1da177e4 LT |
51 | #include <linux/init.h> |
52 | #include <linux/notifier.h> | |
53 | #include <linux/inetdevice.h> | |
54 | #include <linux/igmp.h> | |
55 | #ifdef CONFIG_SYSCTL | |
56 | #include <linux/sysctl.h> | |
57 | #endif | |
58 | #include <linux/kmod.h> | |
59 | ||
14c85021 | 60 | #include <net/arp.h> |
1da177e4 LT |
61 | #include <net/ip.h> |
62 | #include <net/route.h> | |
63 | #include <net/ip_fib.h> | |
63f3444f | 64 | #include <net/rtnetlink.h> |
1da177e4 LT |
65 | |
66 | struct ipv4_devconf ipv4_devconf = { | |
42f811b8 HX |
67 | .data = { |
68 | [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1, | |
69 | [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1, | |
70 | [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1, | |
71 | [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1, | |
72 | }, | |
1da177e4 LT |
73 | }; |
74 | ||
75 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
42f811b8 HX |
76 | .data = { |
77 | [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1, | |
78 | [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1, | |
79 | [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1, | |
80 | [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1, | |
81 | [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1, | |
82 | }, | |
1da177e4 LT |
83 | }; |
84 | ||
42f811b8 HX |
85 | #define IPV4_DEVCONF_DFLT(attr) IPV4_DEVCONF(ipv4_devconf_dflt, attr) |
86 | ||
ef7c79ed | 87 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
88 | [IFA_LOCAL] = { .type = NLA_U32 }, |
89 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
90 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
91 | [IFA_ANYCAST] = { .type = NLA_U32 }, | |
5176f91e | 92 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c753978 TG |
93 | }; |
94 | ||
d6062cbb | 95 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 96 | |
e041c683 | 97 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
98 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
99 | int destroy); | |
100 | #ifdef CONFIG_SYSCTL | |
101 | static void devinet_sysctl_register(struct in_device *in_dev, | |
102 | struct ipv4_devconf *p); | |
103 | static void devinet_sysctl_unregister(struct ipv4_devconf *p); | |
104 | #endif | |
105 | ||
106 | /* Locks all the inet devices. */ | |
107 | ||
108 | static struct in_ifaddr *inet_alloc_ifa(void) | |
109 | { | |
0da974f4 | 110 | struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); |
1da177e4 LT |
111 | |
112 | if (ifa) { | |
1da177e4 LT |
113 | INIT_RCU_HEAD(&ifa->rcu_head); |
114 | } | |
115 | ||
116 | return ifa; | |
117 | } | |
118 | ||
119 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
120 | { | |
121 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
122 | if (ifa->ifa_dev) | |
123 | in_dev_put(ifa->ifa_dev); | |
124 | kfree(ifa); | |
125 | } | |
126 | ||
127 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
128 | { | |
129 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
130 | } | |
131 | ||
132 | void in_dev_finish_destroy(struct in_device *idev) | |
133 | { | |
134 | struct net_device *dev = idev->dev; | |
135 | ||
136 | BUG_TRAP(!idev->ifa_list); | |
137 | BUG_TRAP(!idev->mc_list); | |
138 | #ifdef NET_REFCNT_DEBUG | |
139 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
140 | idev, dev ? dev->name : "NIL"); | |
141 | #endif | |
142 | dev_put(dev); | |
143 | if (!idev->dead) | |
144 | printk("Freeing alive in_device %p\n", idev); | |
145 | else { | |
146 | kfree(idev); | |
147 | } | |
148 | } | |
149 | ||
71e27da9 | 150 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
151 | { |
152 | struct in_device *in_dev; | |
153 | ||
154 | ASSERT_RTNL(); | |
155 | ||
0da974f4 | 156 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
157 | if (!in_dev) |
158 | goto out; | |
1da177e4 LT |
159 | INIT_RCU_HEAD(&in_dev->rcu_head); |
160 | memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf)); | |
161 | in_dev->cnf.sysctl = NULL; | |
162 | in_dev->dev = dev; | |
163 | if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) | |
164 | goto out_kfree; | |
165 | /* Reference in_dev->dev */ | |
166 | dev_hold(dev); | |
167 | #ifdef CONFIG_SYSCTL | |
168 | neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, | |
169 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
170 | #endif | |
171 | ||
30c4cf57 | 172 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 173 | in_dev_hold(in_dev); |
1da177e4 LT |
174 | |
175 | #ifdef CONFIG_SYSCTL | |
176 | devinet_sysctl_register(in_dev, &in_dev->cnf); | |
177 | #endif | |
178 | ip_mc_init_dev(in_dev); | |
179 | if (dev->flags & IFF_UP) | |
180 | ip_mc_up(in_dev); | |
483479ec | 181 | |
30c4cf57 DS |
182 | /* we can receive as soon as ip_ptr is set -- do this last */ |
183 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 184 | out: |
1da177e4 LT |
185 | return in_dev; |
186 | out_kfree: | |
187 | kfree(in_dev); | |
188 | in_dev = NULL; | |
189 | goto out; | |
190 | } | |
191 | ||
192 | static void in_dev_rcu_put(struct rcu_head *head) | |
193 | { | |
194 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
195 | in_dev_put(idev); | |
196 | } | |
197 | ||
198 | static void inetdev_destroy(struct in_device *in_dev) | |
199 | { | |
200 | struct in_ifaddr *ifa; | |
201 | struct net_device *dev; | |
202 | ||
203 | ASSERT_RTNL(); | |
204 | ||
205 | dev = in_dev->dev; | |
206 | if (dev == &loopback_dev) | |
207 | return; | |
208 | ||
209 | in_dev->dead = 1; | |
210 | ||
211 | ip_mc_destroy_dev(in_dev); | |
212 | ||
213 | while ((ifa = in_dev->ifa_list) != NULL) { | |
214 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
215 | inet_free_ifa(ifa); | |
216 | } | |
217 | ||
218 | #ifdef CONFIG_SYSCTL | |
219 | devinet_sysctl_unregister(&in_dev->cnf); | |
220 | #endif | |
221 | ||
222 | dev->ip_ptr = NULL; | |
223 | ||
224 | #ifdef CONFIG_SYSCTL | |
225 | neigh_sysctl_unregister(in_dev->arp_parms); | |
226 | #endif | |
227 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); | |
228 | arp_ifdown(dev); | |
229 | ||
230 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
231 | } | |
232 | ||
ff428d72 | 233 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
234 | { |
235 | rcu_read_lock(); | |
236 | for_primary_ifa(in_dev) { | |
237 | if (inet_ifa_match(a, ifa)) { | |
238 | if (!b || inet_ifa_match(b, ifa)) { | |
239 | rcu_read_unlock(); | |
240 | return 1; | |
241 | } | |
242 | } | |
243 | } endfor_ifa(in_dev); | |
244 | rcu_read_unlock(); | |
245 | return 0; | |
246 | } | |
247 | ||
d6062cbb TG |
248 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
249 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 250 | { |
8f937c60 | 251 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
252 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
253 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
254 | struct in_ifaddr *prev_prom = NULL; | |
255 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
256 | |
257 | ASSERT_RTNL(); | |
258 | ||
e905a9ed | 259 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
260 | * unless alias promotion is set |
261 | **/ | |
1da177e4 LT |
262 | |
263 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
264 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
265 | ||
266 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 267 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
268 | ifa1->ifa_scope <= ifa->ifa_scope) |
269 | last_prim = ifa; | |
270 | ||
1da177e4 LT |
271 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
272 | ifa1->ifa_mask != ifa->ifa_mask || | |
273 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
274 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 275 | prev_prom = ifa; |
1da177e4 LT |
276 | continue; |
277 | } | |
278 | ||
0ff60a45 | 279 | if (!do_promote) { |
8f937c60 | 280 | *ifap1 = ifa->ifa_next; |
1da177e4 | 281 | |
d6062cbb | 282 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
283 | blocking_notifier_call_chain(&inetaddr_chain, |
284 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
285 | inet_free_ifa(ifa); |
286 | } else { | |
287 | promote = ifa; | |
288 | break; | |
289 | } | |
1da177e4 LT |
290 | } |
291 | } | |
292 | ||
293 | /* 2. Unlink it */ | |
294 | ||
295 | *ifap = ifa1->ifa_next; | |
296 | ||
297 | /* 3. Announce address deletion */ | |
298 | ||
299 | /* Send message first, then call notifier. | |
300 | At first sight, FIB update triggered by notifier | |
301 | will refer to already deleted ifaddr, that could confuse | |
302 | netlink listeners. It is not true: look, gated sees | |
303 | that route deleted and if it still thinks that ifaddr | |
304 | is valid, it will try to restore deleted routes... Grr. | |
305 | So that, this order is correct. | |
306 | */ | |
d6062cbb | 307 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 308 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 309 | |
0ff60a45 JHS |
310 | if (promote) { |
311 | ||
312 | if (prev_prom) { | |
313 | prev_prom->ifa_next = promote->ifa_next; | |
314 | promote->ifa_next = last_prim->ifa_next; | |
315 | last_prim->ifa_next = promote; | |
316 | } | |
8f937c60 | 317 | |
8f937c60 | 318 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 319 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
320 | blocking_notifier_call_chain(&inetaddr_chain, |
321 | NETDEV_UP, promote); | |
0ff60a45 JHS |
322 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
323 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
324 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
325 | continue; | |
326 | fib_add_ifaddr(ifa); | |
327 | } | |
328 | ||
329 | } | |
6363097c | 330 | if (destroy) |
0ff60a45 | 331 | inet_free_ifa(ifa1); |
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) { | |
71e27da9 HX |
404 | inet_free_ifa(ifa); |
405 | return -ENOBUFS; | |
1da177e4 | 406 | } |
71e27da9 | 407 | ipv4_devconf_setall(in_dev); |
1da177e4 LT |
408 | if (ifa->ifa_dev != in_dev) { |
409 | BUG_TRAP(!ifa->ifa_dev); | |
410 | in_dev_hold(in_dev); | |
411 | ifa->ifa_dev = in_dev; | |
412 | } | |
413 | if (LOOPBACK(ifa->ifa_local)) | |
414 | ifa->ifa_scope = RT_SCOPE_HOST; | |
415 | return inet_insert_ifa(ifa); | |
416 | } | |
417 | ||
418 | struct in_device *inetdev_by_index(int ifindex) | |
419 | { | |
420 | struct net_device *dev; | |
421 | struct in_device *in_dev = NULL; | |
422 | read_lock(&dev_base_lock); | |
423 | dev = __dev_get_by_index(ifindex); | |
424 | if (dev) | |
425 | in_dev = in_dev_get(dev); | |
426 | read_unlock(&dev_base_lock); | |
427 | return in_dev; | |
428 | } | |
429 | ||
430 | /* Called only from RTNL semaphored context. No locks. */ | |
431 | ||
60cad5da AV |
432 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
433 | __be32 mask) | |
1da177e4 LT |
434 | { |
435 | ASSERT_RTNL(); | |
436 | ||
437 | for_primary_ifa(in_dev) { | |
438 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
439 | return ifa; | |
440 | } endfor_ifa(in_dev); | |
441 | return NULL; | |
442 | } | |
443 | ||
444 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
445 | { | |
dfdd5fd4 | 446 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 447 | struct in_device *in_dev; |
dfdd5fd4 | 448 | struct ifaddrmsg *ifm; |
1da177e4 | 449 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 450 | int err = -EINVAL; |
1da177e4 LT |
451 | |
452 | ASSERT_RTNL(); | |
453 | ||
dfdd5fd4 TG |
454 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
455 | if (err < 0) | |
456 | goto errout; | |
457 | ||
458 | ifm = nlmsg_data(nlh); | |
459 | in_dev = inetdev_by_index(ifm->ifa_index); | |
460 | if (in_dev == NULL) { | |
461 | err = -ENODEV; | |
462 | goto errout; | |
463 | } | |
464 | ||
1da177e4 LT |
465 | __in_dev_put(in_dev); |
466 | ||
467 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
468 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 469 | if (tb[IFA_LOCAL] && |
a7a628c4 | 470 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
471 | continue; |
472 | ||
473 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 474 | continue; |
dfdd5fd4 TG |
475 | |
476 | if (tb[IFA_ADDRESS] && | |
477 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 478 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
479 | continue; |
480 | ||
d6062cbb | 481 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
482 | return 0; |
483 | } | |
dfdd5fd4 TG |
484 | |
485 | err = -EADDRNOTAVAIL; | |
486 | errout: | |
487 | return err; | |
1da177e4 LT |
488 | } |
489 | ||
5c753978 | 490 | static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh) |
1da177e4 | 491 | { |
5c753978 TG |
492 | struct nlattr *tb[IFA_MAX+1]; |
493 | struct in_ifaddr *ifa; | |
494 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
495 | struct net_device *dev; |
496 | struct in_device *in_dev; | |
5c753978 | 497 | int err = -EINVAL; |
1da177e4 | 498 | |
5c753978 TG |
499 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
500 | if (err < 0) | |
501 | goto errout; | |
1da177e4 | 502 | |
5c753978 | 503 | ifm = nlmsg_data(nlh); |
c4e38f41 EP |
504 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) { |
505 | err = -EINVAL; | |
5c753978 | 506 | goto errout; |
c4e38f41 | 507 | } |
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) { | |
71e27da9 HX |
517 | err = -ENOBUFS; |
518 | goto errout; | |
1da177e4 LT |
519 | } |
520 | ||
71e27da9 HX |
521 | ipv4_devconf_setall(in_dev); |
522 | ||
5c753978 TG |
523 | ifa = inet_alloc_ifa(); |
524 | if (ifa == NULL) { | |
525 | /* | |
526 | * A potential indev allocation can be left alive, it stays | |
527 | * assigned to its device and is destroy with it. | |
528 | */ | |
529 | err = -ENOBUFS; | |
530 | goto errout; | |
531 | } | |
532 | ||
533 | in_dev_hold(in_dev); | |
534 | ||
535 | if (tb[IFA_ADDRESS] == NULL) | |
536 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 537 | |
1da177e4 LT |
538 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
539 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
540 | ifa->ifa_flags = ifm->ifa_flags; |
541 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
542 | ifa->ifa_dev = in_dev; |
543 | ||
a7a628c4 AV |
544 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
545 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
546 | |
547 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 548 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 TG |
549 | |
550 | if (tb[IFA_ANYCAST]) | |
a7a628c4 | 551 | ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]); |
5c753978 TG |
552 | |
553 | if (tb[IFA_LABEL]) | |
554 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
555 | else |
556 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
557 | ||
5c753978 TG |
558 | return ifa; |
559 | ||
560 | errout: | |
561 | return ERR_PTR(err); | |
562 | } | |
563 | ||
564 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
565 | { | |
566 | struct in_ifaddr *ifa; | |
567 | ||
568 | ASSERT_RTNL(); | |
569 | ||
570 | ifa = rtm_to_ifaddr(nlh); | |
571 | if (IS_ERR(ifa)) | |
572 | return PTR_ERR(ifa); | |
573 | ||
d6062cbb | 574 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
575 | } |
576 | ||
577 | /* | |
578 | * Determine a default network mask, based on the IP address. | |
579 | */ | |
580 | ||
714e85be | 581 | static __inline__ int inet_abc_len(__be32 addr) |
1da177e4 LT |
582 | { |
583 | int rc = -1; /* Something else, probably a multicast. */ | |
584 | ||
e905a9ed YH |
585 | if (ZERONET(addr)) |
586 | rc = 0; | |
1da177e4 | 587 | else { |
714e85be | 588 | __u32 haddr = ntohl(addr); |
1da177e4 | 589 | |
714e85be | 590 | if (IN_CLASSA(haddr)) |
1da177e4 | 591 | rc = 8; |
714e85be | 592 | else if (IN_CLASSB(haddr)) |
1da177e4 | 593 | rc = 16; |
714e85be | 594 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
595 | rc = 24; |
596 | } | |
597 | ||
e905a9ed | 598 | return rc; |
1da177e4 LT |
599 | } |
600 | ||
601 | ||
602 | int devinet_ioctl(unsigned int cmd, void __user *arg) | |
603 | { | |
604 | struct ifreq ifr; | |
605 | struct sockaddr_in sin_orig; | |
606 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
607 | struct in_device *in_dev; | |
608 | struct in_ifaddr **ifap = NULL; | |
609 | struct in_ifaddr *ifa = NULL; | |
610 | struct net_device *dev; | |
611 | char *colon; | |
612 | int ret = -EFAULT; | |
613 | int tryaddrmatch = 0; | |
614 | ||
615 | /* | |
616 | * Fetch the caller's info block into kernel space | |
617 | */ | |
618 | ||
619 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
620 | goto out; | |
621 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
622 | ||
623 | /* save original address for comparison */ | |
624 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
625 | ||
626 | colon = strchr(ifr.ifr_name, ':'); | |
627 | if (colon) | |
628 | *colon = 0; | |
629 | ||
630 | #ifdef CONFIG_KMOD | |
631 | dev_load(ifr.ifr_name); | |
632 | #endif | |
633 | ||
132adf54 | 634 | switch (cmd) { |
1da177e4 LT |
635 | case SIOCGIFADDR: /* Get interface address */ |
636 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
637 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
638 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
639 | /* Note that these ioctls will not sleep, | |
640 | so that we do not impose a lock. | |
641 | One day we will be forced to put shlock here (I mean SMP) | |
642 | */ | |
643 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
644 | memset(sin, 0, sizeof(*sin)); | |
645 | sin->sin_family = AF_INET; | |
646 | break; | |
647 | ||
648 | case SIOCSIFFLAGS: | |
649 | ret = -EACCES; | |
650 | if (!capable(CAP_NET_ADMIN)) | |
651 | goto out; | |
652 | break; | |
653 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
654 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
655 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
656 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
657 | ret = -EACCES; | |
658 | if (!capable(CAP_NET_ADMIN)) | |
659 | goto out; | |
660 | ret = -EINVAL; | |
661 | if (sin->sin_family != AF_INET) | |
662 | goto out; | |
663 | break; | |
664 | default: | |
665 | ret = -EINVAL; | |
666 | goto out; | |
667 | } | |
668 | ||
669 | rtnl_lock(); | |
670 | ||
671 | ret = -ENODEV; | |
672 | if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL) | |
673 | goto done; | |
674 | ||
675 | if (colon) | |
676 | *colon = ':'; | |
677 | ||
e5ed6399 | 678 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
679 | if (tryaddrmatch) { |
680 | /* Matthias Andree */ | |
681 | /* compare label and address (4.4BSD style) */ | |
682 | /* note: we only do this for a limited set of ioctls | |
683 | and only if the original address family was AF_INET. | |
684 | This is checked above. */ | |
685 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
686 | ifap = &ifa->ifa_next) { | |
687 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
688 | sin_orig.sin_addr.s_addr == | |
689 | ifa->ifa_address) { | |
690 | break; /* found */ | |
691 | } | |
692 | } | |
693 | } | |
694 | /* we didn't get a match, maybe the application is | |
695 | 4.3BSD-style and passed in junk so we fall back to | |
696 | comparing just the label */ | |
697 | if (!ifa) { | |
698 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
699 | ifap = &ifa->ifa_next) | |
700 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
701 | break; | |
702 | } | |
703 | } | |
704 | ||
705 | ret = -EADDRNOTAVAIL; | |
706 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
707 | goto done; | |
708 | ||
132adf54 | 709 | switch (cmd) { |
1da177e4 LT |
710 | case SIOCGIFADDR: /* Get interface address */ |
711 | sin->sin_addr.s_addr = ifa->ifa_local; | |
712 | goto rarok; | |
713 | ||
714 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
715 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
716 | goto rarok; | |
717 | ||
718 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
719 | sin->sin_addr.s_addr = ifa->ifa_address; | |
720 | goto rarok; | |
721 | ||
722 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
723 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
724 | goto rarok; | |
725 | ||
726 | case SIOCSIFFLAGS: | |
727 | if (colon) { | |
728 | ret = -EADDRNOTAVAIL; | |
729 | if (!ifa) | |
730 | break; | |
731 | ret = 0; | |
732 | if (!(ifr.ifr_flags & IFF_UP)) | |
733 | inet_del_ifa(in_dev, ifap, 1); | |
734 | break; | |
735 | } | |
736 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
737 | break; | |
738 | ||
739 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
740 | ret = -EINVAL; | |
741 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
742 | break; | |
743 | ||
744 | if (!ifa) { | |
745 | ret = -ENOBUFS; | |
746 | if ((ifa = inet_alloc_ifa()) == NULL) | |
747 | break; | |
748 | if (colon) | |
749 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
750 | else | |
751 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
752 | } else { | |
753 | ret = 0; | |
754 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
755 | break; | |
756 | inet_del_ifa(in_dev, ifap, 0); | |
757 | ifa->ifa_broadcast = 0; | |
758 | ifa->ifa_anycast = 0; | |
759 | } | |
760 | ||
761 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
762 | ||
763 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
764 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
765 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
766 | if ((dev->flags & IFF_BROADCAST) && | |
767 | ifa->ifa_prefixlen < 31) | |
768 | ifa->ifa_broadcast = ifa->ifa_address | | |
769 | ~ifa->ifa_mask; | |
770 | } else { | |
771 | ifa->ifa_prefixlen = 32; | |
772 | ifa->ifa_mask = inet_make_mask(32); | |
773 | } | |
774 | ret = inet_set_ifa(dev, ifa); | |
775 | break; | |
776 | ||
777 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
778 | ret = 0; | |
779 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
780 | inet_del_ifa(in_dev, ifap, 0); | |
781 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
782 | inet_insert_ifa(ifa); | |
783 | } | |
784 | break; | |
785 | ||
786 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
787 | ret = 0; | |
788 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
789 | break; | |
790 | ret = -EINVAL; | |
791 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
792 | break; | |
793 | ret = 0; | |
794 | inet_del_ifa(in_dev, ifap, 0); | |
795 | ifa->ifa_address = sin->sin_addr.s_addr; | |
796 | inet_insert_ifa(ifa); | |
797 | break; | |
798 | ||
799 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
800 | ||
801 | /* | |
802 | * The mask we set must be legal. | |
803 | */ | |
804 | ret = -EINVAL; | |
805 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
806 | break; | |
807 | ret = 0; | |
808 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 809 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
810 | inet_del_ifa(in_dev, ifap, 0); |
811 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
812 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
813 | ||
814 | /* See if current broadcast address matches | |
815 | * with current netmask, then recalculate | |
816 | * the broadcast address. Otherwise it's a | |
817 | * funny address, so don't touch it since | |
818 | * the user seems to know what (s)he's doing... | |
819 | */ | |
820 | if ((dev->flags & IFF_BROADCAST) && | |
821 | (ifa->ifa_prefixlen < 31) && | |
822 | (ifa->ifa_broadcast == | |
dcab5e1e | 823 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
824 | ifa->ifa_broadcast = (ifa->ifa_local | |
825 | ~sin->sin_addr.s_addr); | |
826 | } | |
827 | inet_insert_ifa(ifa); | |
828 | } | |
829 | break; | |
830 | } | |
831 | done: | |
832 | rtnl_unlock(); | |
833 | out: | |
834 | return ret; | |
835 | rarok: | |
836 | rtnl_unlock(); | |
837 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
838 | goto out; | |
839 | } | |
840 | ||
841 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
842 | { | |
e5ed6399 | 843 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
844 | struct in_ifaddr *ifa; |
845 | struct ifreq ifr; | |
846 | int done = 0; | |
847 | ||
848 | if (!in_dev || (ifa = in_dev->ifa_list) == NULL) | |
849 | goto out; | |
850 | ||
851 | for (; ifa; ifa = ifa->ifa_next) { | |
852 | if (!buf) { | |
853 | done += sizeof(ifr); | |
854 | continue; | |
855 | } | |
856 | if (len < (int) sizeof(ifr)) | |
857 | break; | |
858 | memset(&ifr, 0, sizeof(struct ifreq)); | |
859 | if (ifa->ifa_label) | |
860 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
861 | else | |
862 | strcpy(ifr.ifr_name, dev->name); | |
863 | ||
864 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
865 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
866 | ifa->ifa_local; | |
867 | ||
868 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
869 | done = -EFAULT; | |
870 | break; | |
871 | } | |
872 | buf += sizeof(struct ifreq); | |
873 | len -= sizeof(struct ifreq); | |
874 | done += sizeof(struct ifreq); | |
875 | } | |
876 | out: | |
877 | return done; | |
878 | } | |
879 | ||
a61ced5d | 880 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 881 | { |
a61ced5d | 882 | __be32 addr = 0; |
1da177e4 LT |
883 | struct in_device *in_dev; |
884 | ||
885 | rcu_read_lock(); | |
e5ed6399 | 886 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
887 | if (!in_dev) |
888 | goto no_in_dev; | |
889 | ||
890 | for_primary_ifa(in_dev) { | |
891 | if (ifa->ifa_scope > scope) | |
892 | continue; | |
893 | if (!dst || inet_ifa_match(dst, ifa)) { | |
894 | addr = ifa->ifa_local; | |
895 | break; | |
896 | } | |
897 | if (!addr) | |
898 | addr = ifa->ifa_local; | |
899 | } endfor_ifa(in_dev); | |
900 | no_in_dev: | |
901 | rcu_read_unlock(); | |
902 | ||
903 | if (addr) | |
904 | goto out; | |
905 | ||
906 | /* Not loopback addresses on loopback should be preferred | |
907 | in this case. It is importnat that lo is the first interface | |
908 | in dev_base list. | |
909 | */ | |
910 | read_lock(&dev_base_lock); | |
911 | rcu_read_lock(); | |
7562f876 | 912 | for_each_netdev(dev) { |
e5ed6399 | 913 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) |
1da177e4 LT |
914 | continue; |
915 | ||
916 | for_primary_ifa(in_dev) { | |
917 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
918 | ifa->ifa_scope <= scope) { | |
919 | addr = ifa->ifa_local; | |
920 | goto out_unlock_both; | |
921 | } | |
922 | } endfor_ifa(in_dev); | |
923 | } | |
924 | out_unlock_both: | |
925 | read_unlock(&dev_base_lock); | |
926 | rcu_read_unlock(); | |
927 | out: | |
928 | return addr; | |
929 | } | |
930 | ||
60cad5da AV |
931 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
932 | __be32 local, int scope) | |
1da177e4 LT |
933 | { |
934 | int same = 0; | |
a144ea4b | 935 | __be32 addr = 0; |
1da177e4 LT |
936 | |
937 | for_ifa(in_dev) { | |
938 | if (!addr && | |
939 | (local == ifa->ifa_local || !local) && | |
940 | ifa->ifa_scope <= scope) { | |
941 | addr = ifa->ifa_local; | |
942 | if (same) | |
943 | break; | |
944 | } | |
945 | if (!same) { | |
946 | same = (!local || inet_ifa_match(local, ifa)) && | |
947 | (!dst || inet_ifa_match(dst, ifa)); | |
948 | if (same && addr) { | |
949 | if (local || !dst) | |
950 | break; | |
951 | /* Is the selected addr into dst subnet? */ | |
952 | if (inet_ifa_match(addr, ifa)) | |
953 | break; | |
954 | /* No, then can we use new local src? */ | |
955 | if (ifa->ifa_scope <= scope) { | |
956 | addr = ifa->ifa_local; | |
957 | break; | |
958 | } | |
959 | /* search for large dst subnet for addr */ | |
960 | same = 0; | |
961 | } | |
962 | } | |
963 | } endfor_ifa(in_dev); | |
964 | ||
965 | return same? addr : 0; | |
966 | } | |
967 | ||
968 | /* | |
969 | * Confirm that local IP address exists using wildcards: | |
970 | * - dev: only on this interface, 0=any interface | |
971 | * - dst: only in the same subnet as dst, 0=any dst | |
972 | * - local: address, 0=autoselect the local address | |
973 | * - scope: maximum allowed scope value for the local address | |
974 | */ | |
60cad5da | 975 | __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope) |
1da177e4 | 976 | { |
60cad5da | 977 | __be32 addr = 0; |
1da177e4 LT |
978 | struct in_device *in_dev; |
979 | ||
980 | if (dev) { | |
981 | rcu_read_lock(); | |
e5ed6399 | 982 | if ((in_dev = __in_dev_get_rcu(dev))) |
1da177e4 LT |
983 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
984 | rcu_read_unlock(); | |
985 | ||
986 | return addr; | |
987 | } | |
988 | ||
989 | read_lock(&dev_base_lock); | |
990 | rcu_read_lock(); | |
7562f876 | 991 | for_each_netdev(dev) { |
e5ed6399 | 992 | if ((in_dev = __in_dev_get_rcu(dev))) { |
1da177e4 LT |
993 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
994 | if (addr) | |
995 | break; | |
996 | } | |
997 | } | |
998 | rcu_read_unlock(); | |
999 | read_unlock(&dev_base_lock); | |
1000 | ||
1001 | return addr; | |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * Device notifier | |
1006 | */ | |
1007 | ||
1008 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1009 | { | |
e041c683 | 1010 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1014 | { | |
e041c683 | 1015 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 LT |
1016 | } |
1017 | ||
1018 | /* Rename ifa_labels for a device name change. Make some effort to preserve existing | |
1019 | * alias numbering and to create unique labels if possible. | |
1020 | */ | |
1021 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1022 | { |
1da177e4 LT |
1023 | struct in_ifaddr *ifa; |
1024 | int named = 0; | |
1025 | ||
e905a9ed YH |
1026 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1027 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1028 | |
1029 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1030 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 LT |
1031 | if (named++ == 0) |
1032 | continue; | |
1033 | dot = strchr(ifa->ifa_label, ':'); | |
e905a9ed YH |
1034 | if (dot == NULL) { |
1035 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1036 | dot = old; |
1037 | } | |
e905a9ed YH |
1038 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { |
1039 | strcat(ifa->ifa_label, dot); | |
1040 | } else { | |
1041 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
1042 | } | |
1043 | } | |
1044 | } | |
1da177e4 LT |
1045 | |
1046 | /* Called only under RTNL semaphore */ | |
1047 | ||
1048 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1049 | void *ptr) | |
1050 | { | |
1051 | struct net_device *dev = ptr; | |
e5ed6399 | 1052 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1053 | |
1054 | ASSERT_RTNL(); | |
1055 | ||
1056 | if (!in_dev) { | |
8030f544 | 1057 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1058 | in_dev = inetdev_init(dev); |
b217d616 HX |
1059 | if (!in_dev) |
1060 | return notifier_from_errno(-ENOMEM); | |
8030f544 | 1061 | if (dev == &loopback_dev) { |
42f811b8 HX |
1062 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1063 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1064 | } |
1da177e4 LT |
1065 | } |
1066 | goto out; | |
1067 | } | |
1068 | ||
1069 | switch (event) { | |
1070 | case NETDEV_REGISTER: | |
1071 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1072 | dev->ip_ptr = NULL; | |
1073 | break; | |
1074 | case NETDEV_UP: | |
1075 | if (dev->mtu < 68) | |
1076 | break; | |
1077 | if (dev == &loopback_dev) { | |
1078 | struct in_ifaddr *ifa; | |
1079 | if ((ifa = inet_alloc_ifa()) != NULL) { | |
1080 | ifa->ifa_local = | |
1081 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1082 | ifa->ifa_prefixlen = 8; | |
1083 | ifa->ifa_mask = inet_make_mask(8); | |
1084 | in_dev_hold(in_dev); | |
1085 | ifa->ifa_dev = in_dev; | |
1086 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1087 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1088 | inet_insert_ifa(ifa); | |
1089 | } | |
1090 | } | |
1091 | ip_mc_up(in_dev); | |
1092 | break; | |
1093 | case NETDEV_DOWN: | |
1094 | ip_mc_down(in_dev); | |
1095 | break; | |
1096 | case NETDEV_CHANGEMTU: | |
1097 | if (dev->mtu >= 68) | |
1098 | break; | |
1099 | /* MTU falled under 68, disable IP */ | |
1100 | case NETDEV_UNREGISTER: | |
1101 | inetdev_destroy(in_dev); | |
1102 | break; | |
1103 | case NETDEV_CHANGENAME: | |
1104 | /* Do not notify about label change, this event is | |
1105 | * not interesting to applications using netlink. | |
1106 | */ | |
1107 | inetdev_changename(dev, in_dev); | |
1108 | ||
1109 | #ifdef CONFIG_SYSCTL | |
1110 | devinet_sysctl_unregister(&in_dev->cnf); | |
1111 | neigh_sysctl_unregister(in_dev->arp_parms); | |
1112 | neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, | |
1113 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
1114 | devinet_sysctl_register(in_dev, &in_dev->cnf); | |
1115 | #endif | |
1116 | break; | |
1117 | } | |
1118 | out: | |
1119 | return NOTIFY_DONE; | |
1120 | } | |
1121 | ||
1122 | static struct notifier_block ip_netdev_notifier = { | |
1123 | .notifier_call =inetdev_event, | |
1124 | }; | |
1125 | ||
339bf98f TG |
1126 | static inline size_t inet_nlmsg_size(void) |
1127 | { | |
1128 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1129 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1130 | + nla_total_size(4) /* IFA_LOCAL */ | |
1131 | + nla_total_size(4) /* IFA_BROADCAST */ | |
1132 | + nla_total_size(4) /* IFA_ANYCAST */ | |
1133 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ | |
1134 | } | |
1135 | ||
1da177e4 | 1136 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1137 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1138 | { |
1139 | struct ifaddrmsg *ifm; | |
1140 | struct nlmsghdr *nlh; | |
1da177e4 | 1141 | |
47f68512 TG |
1142 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1143 | if (nlh == NULL) | |
26932566 | 1144 | return -EMSGSIZE; |
47f68512 TG |
1145 | |
1146 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1147 | ifm->ifa_family = AF_INET; |
1148 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1149 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1150 | ifm->ifa_scope = ifa->ifa_scope; | |
1151 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1152 | |
1da177e4 | 1153 | if (ifa->ifa_address) |
a7a628c4 | 1154 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1155 | |
1da177e4 | 1156 | if (ifa->ifa_local) |
a7a628c4 | 1157 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1158 | |
1da177e4 | 1159 | if (ifa->ifa_broadcast) |
a7a628c4 | 1160 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1161 | |
1da177e4 | 1162 | if (ifa->ifa_anycast) |
a7a628c4 | 1163 | NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast); |
47f68512 | 1164 | |
1da177e4 | 1165 | if (ifa->ifa_label[0]) |
47f68512 | 1166 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1167 | |
47f68512 TG |
1168 | return nlmsg_end(skb, nlh); |
1169 | ||
1170 | nla_put_failure: | |
26932566 PM |
1171 | nlmsg_cancel(skb, nlh); |
1172 | return -EMSGSIZE; | |
1da177e4 LT |
1173 | } |
1174 | ||
1175 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1176 | { | |
1177 | int idx, ip_idx; | |
1178 | struct net_device *dev; | |
1179 | struct in_device *in_dev; | |
1180 | struct in_ifaddr *ifa; | |
1181 | int s_ip_idx, s_idx = cb->args[0]; | |
1182 | ||
1183 | s_ip_idx = ip_idx = cb->args[1]; | |
7562f876 PE |
1184 | idx = 0; |
1185 | for_each_netdev(dev) { | |
1da177e4 | 1186 | if (idx < s_idx) |
7562f876 | 1187 | goto cont; |
1da177e4 LT |
1188 | if (idx > s_idx) |
1189 | s_ip_idx = 0; | |
6313c1e0 | 1190 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
7562f876 | 1191 | goto cont; |
1da177e4 LT |
1192 | |
1193 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1194 | ifa = ifa->ifa_next, ip_idx++) { | |
1195 | if (ip_idx < s_ip_idx) | |
596e4150 | 1196 | continue; |
1da177e4 LT |
1197 | if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, |
1198 | cb->nlh->nlmsg_seq, | |
6313c1e0 | 1199 | RTM_NEWADDR, NLM_F_MULTI) <= 0) |
1da177e4 | 1200 | goto done; |
1da177e4 | 1201 | } |
7562f876 PE |
1202 | cont: |
1203 | idx++; | |
1da177e4 LT |
1204 | } |
1205 | ||
1206 | done: | |
1da177e4 LT |
1207 | cb->args[0] = idx; |
1208 | cb->args[1] = ip_idx; | |
1209 | ||
1210 | return skb->len; | |
1211 | } | |
1212 | ||
d6062cbb TG |
1213 | static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh, |
1214 | u32 pid) | |
1da177e4 | 1215 | { |
47f68512 | 1216 | struct sk_buff *skb; |
d6062cbb TG |
1217 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1218 | int err = -ENOBUFS; | |
1da177e4 | 1219 | |
339bf98f | 1220 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1221 | if (skb == NULL) |
d6062cbb TG |
1222 | goto errout; |
1223 | ||
1224 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1225 | if (err < 0) { |
1226 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1227 | WARN_ON(err == -EMSGSIZE); | |
1228 | kfree_skb(skb); | |
1229 | goto errout; | |
1230 | } | |
d6062cbb TG |
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 | ||
1da177e4 LT |
1237 | #ifdef CONFIG_SYSCTL |
1238 | ||
31be3085 HX |
1239 | static void devinet_copy_dflt_conf(int i) |
1240 | { | |
1241 | struct net_device *dev; | |
1242 | ||
1243 | read_lock(&dev_base_lock); | |
1244 | for_each_netdev(dev) { | |
1245 | struct in_device *in_dev; | |
1246 | rcu_read_lock(); | |
1247 | in_dev = __in_dev_get_rcu(dev); | |
1248 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
1249 | in_dev->cnf.data[i] = ipv4_devconf_dflt.data[i]; | |
1250 | rcu_read_unlock(); | |
1251 | } | |
1252 | read_unlock(&dev_base_lock); | |
1253 | } | |
1254 | ||
1255 | static int devinet_conf_proc(ctl_table *ctl, int write, | |
1256 | struct file* filp, void __user *buffer, | |
1257 | size_t *lenp, loff_t *ppos) | |
1258 | { | |
1259 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1260 | ||
1261 | if (write) { | |
1262 | struct ipv4_devconf *cnf = ctl->extra1; | |
1263 | int i = (int *)ctl->data - cnf->data; | |
1264 | ||
1265 | set_bit(i, cnf->state); | |
1266 | ||
1267 | if (cnf == &ipv4_devconf_dflt) | |
1268 | devinet_copy_dflt_conf(i); | |
1269 | } | |
1270 | ||
1271 | return ret; | |
1272 | } | |
1273 | ||
1274 | static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen, | |
1275 | void __user *oldval, size_t __user *oldlenp, | |
1276 | void __user *newval, size_t newlen) | |
1277 | { | |
1278 | struct ipv4_devconf *cnf; | |
1279 | int *valp = table->data; | |
1280 | int new; | |
1281 | int i; | |
1282 | ||
1283 | if (!newval || !newlen) | |
1284 | return 0; | |
1285 | ||
1286 | if (newlen != sizeof(int)) | |
1287 | return -EINVAL; | |
1288 | ||
1289 | if (get_user(new, (int __user *)newval)) | |
1290 | return -EFAULT; | |
1291 | ||
1292 | if (new == *valp) | |
1293 | return 0; | |
1294 | ||
1295 | if (oldval && oldlenp) { | |
1296 | size_t len; | |
1297 | ||
1298 | if (get_user(len, oldlenp)) | |
1299 | return -EFAULT; | |
1300 | ||
1301 | if (len) { | |
1302 | if (len > table->maxlen) | |
1303 | len = table->maxlen; | |
1304 | if (copy_to_user(oldval, valp, len)) | |
1305 | return -EFAULT; | |
1306 | if (put_user(len, oldlenp)) | |
1307 | return -EFAULT; | |
1308 | } | |
1309 | } | |
1310 | ||
1311 | *valp = new; | |
1312 | ||
1313 | cnf = table->extra1; | |
1314 | i = (int *)table->data - cnf->data; | |
1315 | ||
1316 | set_bit(i, cnf->state); | |
1317 | ||
1318 | if (cnf == &ipv4_devconf_dflt) | |
1319 | devinet_copy_dflt_conf(i); | |
1320 | ||
1321 | return 1; | |
1322 | } | |
1323 | ||
1da177e4 LT |
1324 | void inet_forward_change(void) |
1325 | { | |
1326 | struct net_device *dev; | |
42f811b8 | 1327 | int on = IPV4_DEVCONF_ALL(FORWARDING); |
1da177e4 | 1328 | |
42f811b8 HX |
1329 | IPV4_DEVCONF_ALL(ACCEPT_REDIRECTS) = !on; |
1330 | IPV4_DEVCONF_DFLT(FORWARDING) = on; | |
1da177e4 LT |
1331 | |
1332 | read_lock(&dev_base_lock); | |
7562f876 | 1333 | for_each_netdev(dev) { |
1da177e4 LT |
1334 | struct in_device *in_dev; |
1335 | rcu_read_lock(); | |
e5ed6399 | 1336 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 | 1337 | if (in_dev) |
42f811b8 | 1338 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); |
1da177e4 LT |
1339 | rcu_read_unlock(); |
1340 | } | |
1341 | read_unlock(&dev_base_lock); | |
1342 | ||
1343 | rt_cache_flush(0); | |
1344 | } | |
1345 | ||
1346 | static int devinet_sysctl_forward(ctl_table *ctl, int write, | |
1347 | struct file* filp, void __user *buffer, | |
1348 | size_t *lenp, loff_t *ppos) | |
1349 | { | |
1350 | int *valp = ctl->data; | |
1351 | int val = *valp; | |
1352 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1353 | ||
1354 | if (write && *valp != val) { | |
42f811b8 | 1355 | if (valp == &IPV4_DEVCONF_ALL(FORWARDING)) |
1da177e4 | 1356 | inet_forward_change(); |
42f811b8 | 1357 | else if (valp != &IPV4_DEVCONF_DFLT(FORWARDING)) |
1da177e4 LT |
1358 | rt_cache_flush(0); |
1359 | } | |
1360 | ||
1361 | return ret; | |
1362 | } | |
1363 | ||
1364 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
1365 | struct file* filp, void __user *buffer, | |
1366 | size_t *lenp, loff_t *ppos) | |
1367 | { | |
1368 | int *valp = ctl->data; | |
1369 | int val = *valp; | |
1370 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1371 | ||
1372 | if (write && *valp != val) | |
1373 | rt_cache_flush(0); | |
1374 | ||
1375 | return ret; | |
1376 | } | |
1377 | ||
1378 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
1379 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 1380 | void __user *newval, size_t newlen) |
1da177e4 | 1381 | { |
31be3085 HX |
1382 | int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp, |
1383 | newval, newlen); | |
1da177e4 | 1384 | |
31be3085 HX |
1385 | if (ret == 1) |
1386 | rt_cache_flush(0); | |
1da177e4 | 1387 | |
31be3085 | 1388 | return ret; |
1da177e4 LT |
1389 | } |
1390 | ||
1391 | ||
42f811b8 HX |
1392 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \ |
1393 | { \ | |
1394 | .ctl_name = NET_IPV4_CONF_ ## attr, \ | |
1395 | .procname = name, \ | |
1396 | .data = ipv4_devconf.data + \ | |
1397 | NET_IPV4_CONF_ ## attr - 1, \ | |
1398 | .maxlen = sizeof(int), \ | |
1399 | .mode = mval, \ | |
1400 | .proc_handler = proc, \ | |
1401 | .strategy = sysctl, \ | |
31be3085 | 1402 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1403 | } |
1404 | ||
1405 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
31be3085 HX |
1406 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \ |
1407 | devinet_conf_sysctl) | |
42f811b8 HX |
1408 | |
1409 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
31be3085 HX |
1410 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \ |
1411 | devinet_conf_sysctl) | |
42f811b8 HX |
1412 | |
1413 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \ | |
1414 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl) | |
1415 | ||
1416 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
1417 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \ | |
1418 | ipv4_doint_and_flush_strategy) | |
1419 | ||
1da177e4 LT |
1420 | static struct devinet_sysctl_table { |
1421 | struct ctl_table_header *sysctl_header; | |
1422 | ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; | |
1423 | ctl_table devinet_dev[2]; | |
1424 | ctl_table devinet_conf_dir[2]; | |
1425 | ctl_table devinet_proto_dir[2]; | |
1426 | ctl_table devinet_root_dir[2]; | |
1427 | } devinet_sysctl = { | |
1428 | .devinet_vars = { | |
42f811b8 | 1429 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
31be3085 HX |
1430 | devinet_sysctl_forward, |
1431 | devinet_conf_sysctl), | |
42f811b8 HX |
1432 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1433 | ||
1434 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1435 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1436 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1437 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1438 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1439 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1440 | "accept_source_route"), | |
1441 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), | |
1442 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1443 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1444 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1445 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1446 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1447 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1448 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1449 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
1450 | ||
1451 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1452 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1453 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1454 | "force_igmp_version"), | |
1455 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1456 | "promote_secondaries"), | |
1da177e4 LT |
1457 | }, |
1458 | .devinet_dev = { | |
1459 | { | |
1460 | .ctl_name = NET_PROTO_CONF_ALL, | |
1461 | .procname = "all", | |
1462 | .mode = 0555, | |
1463 | .child = devinet_sysctl.devinet_vars, | |
1464 | }, | |
1465 | }, | |
1466 | .devinet_conf_dir = { | |
e905a9ed | 1467 | { |
1da177e4 LT |
1468 | .ctl_name = NET_IPV4_CONF, |
1469 | .procname = "conf", | |
1470 | .mode = 0555, | |
1471 | .child = devinet_sysctl.devinet_dev, | |
1472 | }, | |
1473 | }, | |
1474 | .devinet_proto_dir = { | |
1475 | { | |
1476 | .ctl_name = NET_IPV4, | |
1477 | .procname = "ipv4", | |
1478 | .mode = 0555, | |
1479 | .child = devinet_sysctl.devinet_conf_dir, | |
1480 | }, | |
1481 | }, | |
1482 | .devinet_root_dir = { | |
1483 | { | |
1484 | .ctl_name = CTL_NET, | |
1485 | .procname = "net", | |
1486 | .mode = 0555, | |
1487 | .child = devinet_sysctl.devinet_proto_dir, | |
1488 | }, | |
1489 | }, | |
1490 | }; | |
1491 | ||
1492 | static void devinet_sysctl_register(struct in_device *in_dev, | |
1493 | struct ipv4_devconf *p) | |
1494 | { | |
1495 | int i; | |
1496 | struct net_device *dev = in_dev ? in_dev->dev : NULL; | |
42e5ea46 ACM |
1497 | struct devinet_sysctl_table *t = kmemdup(&devinet_sysctl, sizeof(*t), |
1498 | GFP_KERNEL); | |
1da177e4 LT |
1499 | char *dev_name = NULL; |
1500 | ||
1501 | if (!t) | |
1502 | return; | |
1da177e4 LT |
1503 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1504 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1505 | t->devinet_vars[i].extra1 = p; |
1da177e4 LT |
1506 | } |
1507 | ||
1508 | if (dev) { | |
e905a9ed | 1509 | dev_name = dev->name; |
1da177e4 LT |
1510 | t->devinet_dev[0].ctl_name = dev->ifindex; |
1511 | } else { | |
1512 | dev_name = "default"; | |
1513 | t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; | |
1514 | } | |
1515 | ||
e905a9ed YH |
1516 | /* |
1517 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1518 | * by sysctl and we wouldn't want anyone to change it under our feet |
1519 | * (see SIOCSIFNAME). | |
e905a9ed | 1520 | */ |
543537bd | 1521 | dev_name = kstrdup(dev_name, GFP_KERNEL); |
1da177e4 LT |
1522 | if (!dev_name) |
1523 | goto free; | |
1524 | ||
1525 | t->devinet_dev[0].procname = dev_name; | |
1526 | t->devinet_dev[0].child = t->devinet_vars; | |
1da177e4 | 1527 | t->devinet_conf_dir[0].child = t->devinet_dev; |
1da177e4 | 1528 | t->devinet_proto_dir[0].child = t->devinet_conf_dir; |
1da177e4 | 1529 | t->devinet_root_dir[0].child = t->devinet_proto_dir; |
1da177e4 | 1530 | |
0b4d4147 | 1531 | t->sysctl_header = register_sysctl_table(t->devinet_root_dir); |
1da177e4 LT |
1532 | if (!t->sysctl_header) |
1533 | goto free_procname; | |
1534 | ||
1535 | p->sysctl = t; | |
1536 | return; | |
1537 | ||
1538 | /* error path */ | |
1539 | free_procname: | |
1540 | kfree(dev_name); | |
1541 | free: | |
1542 | kfree(t); | |
1543 | return; | |
1544 | } | |
1545 | ||
1546 | static void devinet_sysctl_unregister(struct ipv4_devconf *p) | |
1547 | { | |
1548 | if (p->sysctl) { | |
1549 | struct devinet_sysctl_table *t = p->sysctl; | |
1550 | p->sysctl = NULL; | |
1551 | unregister_sysctl_table(t->sysctl_header); | |
1552 | kfree(t->devinet_dev[0].procname); | |
1553 | kfree(t); | |
1554 | } | |
1555 | } | |
1556 | #endif | |
1557 | ||
1558 | void __init devinet_init(void) | |
1559 | { | |
1560 | register_gifconf(PF_INET, inet_gifconf); | |
1561 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f TG |
1562 | |
1563 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1564 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1565 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 LT |
1566 | #ifdef CONFIG_SYSCTL |
1567 | devinet_sysctl.sysctl_header = | |
0b4d4147 | 1568 | register_sysctl_table(devinet_sysctl.devinet_root_dir); |
1da177e4 LT |
1569 | devinet_sysctl_register(NULL, &ipv4_devconf_dflt); |
1570 | #endif | |
1571 | } | |
1572 | ||
1da177e4 LT |
1573 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1574 | EXPORT_SYMBOL(inet_select_addr); | |
1575 | EXPORT_SYMBOL(inetdev_by_index); | |
1576 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
1577 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |