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 | |
66f27a52 | 101 | static void devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
102 | static void devinet_sysctl_unregister(struct in_device *idev); |
103 | #else | |
104 | static inline void devinet_sysctl_register(struct in_device *idev) | |
105 | { | |
106 | } | |
107 | static inline void devinet_sysctl_unregister(struct in_device *idev) | |
108 | { | |
109 | } | |
1da177e4 LT |
110 | #endif |
111 | ||
112 | /* Locks all the inet devices. */ | |
113 | ||
114 | static struct in_ifaddr *inet_alloc_ifa(void) | |
115 | { | |
0da974f4 | 116 | struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); |
1da177e4 LT |
117 | |
118 | if (ifa) { | |
1da177e4 LT |
119 | INIT_RCU_HEAD(&ifa->rcu_head); |
120 | } | |
121 | ||
122 | return ifa; | |
123 | } | |
124 | ||
125 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
126 | { | |
127 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
128 | if (ifa->ifa_dev) | |
129 | in_dev_put(ifa->ifa_dev); | |
130 | kfree(ifa); | |
131 | } | |
132 | ||
133 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
134 | { | |
135 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
136 | } | |
137 | ||
138 | void in_dev_finish_destroy(struct in_device *idev) | |
139 | { | |
140 | struct net_device *dev = idev->dev; | |
141 | ||
142 | BUG_TRAP(!idev->ifa_list); | |
143 | BUG_TRAP(!idev->mc_list); | |
144 | #ifdef NET_REFCNT_DEBUG | |
145 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
146 | idev, dev ? dev->name : "NIL"); | |
147 | #endif | |
148 | dev_put(dev); | |
149 | if (!idev->dead) | |
150 | printk("Freeing alive in_device %p\n", idev); | |
151 | else { | |
152 | kfree(idev); | |
153 | } | |
154 | } | |
155 | ||
71e27da9 | 156 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
157 | { |
158 | struct in_device *in_dev; | |
159 | ||
160 | ASSERT_RTNL(); | |
161 | ||
0da974f4 | 162 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
163 | if (!in_dev) |
164 | goto out; | |
1da177e4 LT |
165 | INIT_RCU_HEAD(&in_dev->rcu_head); |
166 | memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf)); | |
167 | in_dev->cnf.sysctl = NULL; | |
168 | in_dev->dev = dev; | |
169 | if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) | |
170 | goto out_kfree; | |
171 | /* Reference in_dev->dev */ | |
172 | dev_hold(dev); | |
30c4cf57 | 173 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 174 | in_dev_hold(in_dev); |
1da177e4 | 175 | |
66f27a52 | 176 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
177 | ip_mc_init_dev(in_dev); |
178 | if (dev->flags & IFF_UP) | |
179 | ip_mc_up(in_dev); | |
483479ec | 180 | |
30c4cf57 DS |
181 | /* we can receive as soon as ip_ptr is set -- do this last */ |
182 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 183 | out: |
1da177e4 LT |
184 | return in_dev; |
185 | out_kfree: | |
186 | kfree(in_dev); | |
187 | in_dev = NULL; | |
188 | goto out; | |
189 | } | |
190 | ||
191 | static void in_dev_rcu_put(struct rcu_head *head) | |
192 | { | |
193 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
194 | in_dev_put(idev); | |
195 | } | |
196 | ||
197 | static void inetdev_destroy(struct in_device *in_dev) | |
198 | { | |
199 | struct in_ifaddr *ifa; | |
200 | struct net_device *dev; | |
201 | ||
202 | ASSERT_RTNL(); | |
203 | ||
204 | dev = in_dev->dev; | |
1da177e4 LT |
205 | |
206 | in_dev->dead = 1; | |
207 | ||
208 | ip_mc_destroy_dev(in_dev); | |
209 | ||
210 | while ((ifa = in_dev->ifa_list) != NULL) { | |
211 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
212 | inet_free_ifa(ifa); | |
213 | } | |
214 | ||
1da177e4 LT |
215 | dev->ip_ptr = NULL; |
216 | ||
51602b2a | 217 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
218 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
219 | arp_ifdown(dev); | |
220 | ||
221 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
222 | } | |
223 | ||
ff428d72 | 224 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
225 | { |
226 | rcu_read_lock(); | |
227 | for_primary_ifa(in_dev) { | |
228 | if (inet_ifa_match(a, ifa)) { | |
229 | if (!b || inet_ifa_match(b, ifa)) { | |
230 | rcu_read_unlock(); | |
231 | return 1; | |
232 | } | |
233 | } | |
234 | } endfor_ifa(in_dev); | |
235 | rcu_read_unlock(); | |
236 | return 0; | |
237 | } | |
238 | ||
d6062cbb TG |
239 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
240 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 241 | { |
8f937c60 | 242 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
243 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
244 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
245 | struct in_ifaddr *prev_prom = NULL; | |
246 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
247 | |
248 | ASSERT_RTNL(); | |
249 | ||
e905a9ed | 250 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
251 | * unless alias promotion is set |
252 | **/ | |
1da177e4 LT |
253 | |
254 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
255 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
256 | ||
257 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 258 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
259 | ifa1->ifa_scope <= ifa->ifa_scope) |
260 | last_prim = ifa; | |
261 | ||
1da177e4 LT |
262 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
263 | ifa1->ifa_mask != ifa->ifa_mask || | |
264 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
265 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 266 | prev_prom = ifa; |
1da177e4 LT |
267 | continue; |
268 | } | |
269 | ||
0ff60a45 | 270 | if (!do_promote) { |
8f937c60 | 271 | *ifap1 = ifa->ifa_next; |
1da177e4 | 272 | |
d6062cbb | 273 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
274 | blocking_notifier_call_chain(&inetaddr_chain, |
275 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
276 | inet_free_ifa(ifa); |
277 | } else { | |
278 | promote = ifa; | |
279 | break; | |
280 | } | |
1da177e4 LT |
281 | } |
282 | } | |
283 | ||
284 | /* 2. Unlink it */ | |
285 | ||
286 | *ifap = ifa1->ifa_next; | |
287 | ||
288 | /* 3. Announce address deletion */ | |
289 | ||
290 | /* Send message first, then call notifier. | |
291 | At first sight, FIB update triggered by notifier | |
292 | will refer to already deleted ifaddr, that could confuse | |
293 | netlink listeners. It is not true: look, gated sees | |
294 | that route deleted and if it still thinks that ifaddr | |
295 | is valid, it will try to restore deleted routes... Grr. | |
296 | So that, this order is correct. | |
297 | */ | |
d6062cbb | 298 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 299 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 300 | |
0ff60a45 JHS |
301 | if (promote) { |
302 | ||
303 | if (prev_prom) { | |
304 | prev_prom->ifa_next = promote->ifa_next; | |
305 | promote->ifa_next = last_prim->ifa_next; | |
306 | last_prim->ifa_next = promote; | |
307 | } | |
8f937c60 | 308 | |
8f937c60 | 309 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 310 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
311 | blocking_notifier_call_chain(&inetaddr_chain, |
312 | NETDEV_UP, promote); | |
0ff60a45 JHS |
313 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
314 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
315 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
316 | continue; | |
317 | fib_add_ifaddr(ifa); | |
318 | } | |
319 | ||
320 | } | |
6363097c | 321 | if (destroy) |
0ff60a45 | 322 | inet_free_ifa(ifa1); |
1da177e4 LT |
323 | } |
324 | ||
d6062cbb TG |
325 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
326 | int destroy) | |
327 | { | |
328 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
329 | } | |
330 | ||
331 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
332 | u32 pid) | |
1da177e4 LT |
333 | { |
334 | struct in_device *in_dev = ifa->ifa_dev; | |
335 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
336 | ||
337 | ASSERT_RTNL(); | |
338 | ||
339 | if (!ifa->ifa_local) { | |
340 | inet_free_ifa(ifa); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
345 | last_primary = &in_dev->ifa_list; | |
346 | ||
347 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
348 | ifap = &ifa1->ifa_next) { | |
349 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
350 | ifa->ifa_scope <= ifa1->ifa_scope) | |
351 | last_primary = &ifa1->ifa_next; | |
352 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
353 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
354 | if (ifa1->ifa_local == ifa->ifa_local) { | |
355 | inet_free_ifa(ifa); | |
356 | return -EEXIST; | |
357 | } | |
358 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
359 | inet_free_ifa(ifa); | |
360 | return -EINVAL; | |
361 | } | |
362 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
363 | } | |
364 | } | |
365 | ||
366 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
367 | net_srandom(ifa->ifa_local); | |
368 | ifap = last_primary; | |
369 | } | |
370 | ||
371 | ifa->ifa_next = *ifap; | |
372 | *ifap = ifa; | |
373 | ||
374 | /* Send message first, then call notifier. | |
375 | Notifier will trigger FIB update, so that | |
376 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 377 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 378 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
379 | |
380 | return 0; | |
381 | } | |
382 | ||
d6062cbb TG |
383 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
384 | { | |
385 | return __inet_insert_ifa(ifa, NULL, 0); | |
386 | } | |
387 | ||
1da177e4 LT |
388 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
389 | { | |
e5ed6399 | 390 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
391 | |
392 | ASSERT_RTNL(); | |
393 | ||
394 | if (!in_dev) { | |
71e27da9 HX |
395 | inet_free_ifa(ifa); |
396 | return -ENOBUFS; | |
1da177e4 | 397 | } |
71e27da9 | 398 | ipv4_devconf_setall(in_dev); |
1da177e4 LT |
399 | if (ifa->ifa_dev != in_dev) { |
400 | BUG_TRAP(!ifa->ifa_dev); | |
401 | in_dev_hold(in_dev); | |
402 | ifa->ifa_dev = in_dev; | |
403 | } | |
404 | if (LOOPBACK(ifa->ifa_local)) | |
405 | ifa->ifa_scope = RT_SCOPE_HOST; | |
406 | return inet_insert_ifa(ifa); | |
407 | } | |
408 | ||
409 | struct in_device *inetdev_by_index(int ifindex) | |
410 | { | |
411 | struct net_device *dev; | |
412 | struct in_device *in_dev = NULL; | |
413 | read_lock(&dev_base_lock); | |
881d966b | 414 | dev = __dev_get_by_index(&init_net, ifindex); |
1da177e4 LT |
415 | if (dev) |
416 | in_dev = in_dev_get(dev); | |
417 | read_unlock(&dev_base_lock); | |
418 | return in_dev; | |
419 | } | |
420 | ||
421 | /* Called only from RTNL semaphored context. No locks. */ | |
422 | ||
60cad5da AV |
423 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
424 | __be32 mask) | |
1da177e4 LT |
425 | { |
426 | ASSERT_RTNL(); | |
427 | ||
428 | for_primary_ifa(in_dev) { | |
429 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
430 | return ifa; | |
431 | } endfor_ifa(in_dev); | |
432 | return NULL; | |
433 | } | |
434 | ||
435 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
436 | { | |
b854272b | 437 | struct net *net = skb->sk->sk_net; |
dfdd5fd4 | 438 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 439 | struct in_device *in_dev; |
dfdd5fd4 | 440 | struct ifaddrmsg *ifm; |
1da177e4 | 441 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 442 | int err = -EINVAL; |
1da177e4 LT |
443 | |
444 | ASSERT_RTNL(); | |
445 | ||
b854272b DL |
446 | if (net != &init_net) |
447 | return -EINVAL; | |
448 | ||
dfdd5fd4 TG |
449 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
450 | if (err < 0) | |
451 | goto errout; | |
452 | ||
453 | ifm = nlmsg_data(nlh); | |
454 | in_dev = inetdev_by_index(ifm->ifa_index); | |
455 | if (in_dev == NULL) { | |
456 | err = -ENODEV; | |
457 | goto errout; | |
458 | } | |
459 | ||
1da177e4 LT |
460 | __in_dev_put(in_dev); |
461 | ||
462 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
463 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 464 | if (tb[IFA_LOCAL] && |
a7a628c4 | 465 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
466 | continue; |
467 | ||
468 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 469 | continue; |
dfdd5fd4 TG |
470 | |
471 | if (tb[IFA_ADDRESS] && | |
472 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 473 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
474 | continue; |
475 | ||
d6062cbb | 476 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
477 | return 0; |
478 | } | |
dfdd5fd4 TG |
479 | |
480 | err = -EADDRNOTAVAIL; | |
481 | errout: | |
482 | return err; | |
1da177e4 LT |
483 | } |
484 | ||
5c753978 | 485 | static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh) |
1da177e4 | 486 | { |
5c753978 TG |
487 | struct nlattr *tb[IFA_MAX+1]; |
488 | struct in_ifaddr *ifa; | |
489 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
490 | struct net_device *dev; |
491 | struct in_device *in_dev; | |
5c753978 | 492 | int err = -EINVAL; |
1da177e4 | 493 | |
5c753978 TG |
494 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
495 | if (err < 0) | |
496 | goto errout; | |
1da177e4 | 497 | |
5c753978 | 498 | ifm = nlmsg_data(nlh); |
c4e38f41 EP |
499 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) { |
500 | err = -EINVAL; | |
5c753978 | 501 | goto errout; |
c4e38f41 | 502 | } |
1da177e4 | 503 | |
881d966b | 504 | dev = __dev_get_by_index(&init_net, ifm->ifa_index); |
5c753978 TG |
505 | if (dev == NULL) { |
506 | err = -ENODEV; | |
507 | goto errout; | |
508 | } | |
1da177e4 | 509 | |
5c753978 TG |
510 | in_dev = __in_dev_get_rtnl(dev); |
511 | if (in_dev == NULL) { | |
71e27da9 HX |
512 | err = -ENOBUFS; |
513 | goto errout; | |
1da177e4 LT |
514 | } |
515 | ||
5c753978 TG |
516 | ifa = inet_alloc_ifa(); |
517 | if (ifa == NULL) { | |
518 | /* | |
519 | * A potential indev allocation can be left alive, it stays | |
520 | * assigned to its device and is destroy with it. | |
521 | */ | |
522 | err = -ENOBUFS; | |
523 | goto errout; | |
524 | } | |
525 | ||
a4e65d36 | 526 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
527 | in_dev_hold(in_dev); |
528 | ||
529 | if (tb[IFA_ADDRESS] == NULL) | |
530 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 531 | |
1da177e4 LT |
532 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
533 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
534 | ifa->ifa_flags = ifm->ifa_flags; |
535 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
536 | ifa->ifa_dev = in_dev; |
537 | ||
a7a628c4 AV |
538 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
539 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
540 | |
541 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 542 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 TG |
543 | |
544 | if (tb[IFA_ANYCAST]) | |
a7a628c4 | 545 | ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]); |
5c753978 TG |
546 | |
547 | if (tb[IFA_LABEL]) | |
548 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
549 | else |
550 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
551 | ||
5c753978 TG |
552 | return ifa; |
553 | ||
554 | errout: | |
555 | return ERR_PTR(err); | |
556 | } | |
557 | ||
558 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
559 | { | |
b854272b | 560 | struct net *net = skb->sk->sk_net; |
5c753978 TG |
561 | struct in_ifaddr *ifa; |
562 | ||
563 | ASSERT_RTNL(); | |
564 | ||
b854272b DL |
565 | if (net != &init_net) |
566 | return -EINVAL; | |
567 | ||
5c753978 TG |
568 | ifa = rtm_to_ifaddr(nlh); |
569 | if (IS_ERR(ifa)) | |
570 | return PTR_ERR(ifa); | |
571 | ||
d6062cbb | 572 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
573 | } |
574 | ||
575 | /* | |
576 | * Determine a default network mask, based on the IP address. | |
577 | */ | |
578 | ||
714e85be | 579 | static __inline__ int inet_abc_len(__be32 addr) |
1da177e4 LT |
580 | { |
581 | int rc = -1; /* Something else, probably a multicast. */ | |
582 | ||
e905a9ed YH |
583 | if (ZERONET(addr)) |
584 | rc = 0; | |
1da177e4 | 585 | else { |
714e85be | 586 | __u32 haddr = ntohl(addr); |
1da177e4 | 587 | |
714e85be | 588 | if (IN_CLASSA(haddr)) |
1da177e4 | 589 | rc = 8; |
714e85be | 590 | else if (IN_CLASSB(haddr)) |
1da177e4 | 591 | rc = 16; |
714e85be | 592 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
593 | rc = 24; |
594 | } | |
595 | ||
e905a9ed | 596 | return rc; |
1da177e4 LT |
597 | } |
598 | ||
599 | ||
600 | int devinet_ioctl(unsigned int cmd, void __user *arg) | |
601 | { | |
602 | struct ifreq ifr; | |
603 | struct sockaddr_in sin_orig; | |
604 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
605 | struct in_device *in_dev; | |
606 | struct in_ifaddr **ifap = NULL; | |
607 | struct in_ifaddr *ifa = NULL; | |
608 | struct net_device *dev; | |
609 | char *colon; | |
610 | int ret = -EFAULT; | |
611 | int tryaddrmatch = 0; | |
612 | ||
613 | /* | |
614 | * Fetch the caller's info block into kernel space | |
615 | */ | |
616 | ||
617 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
618 | goto out; | |
619 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
620 | ||
621 | /* save original address for comparison */ | |
622 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
623 | ||
624 | colon = strchr(ifr.ifr_name, ':'); | |
625 | if (colon) | |
626 | *colon = 0; | |
627 | ||
628 | #ifdef CONFIG_KMOD | |
881d966b | 629 | dev_load(&init_net, ifr.ifr_name); |
1da177e4 LT |
630 | #endif |
631 | ||
132adf54 | 632 | switch (cmd) { |
1da177e4 LT |
633 | case SIOCGIFADDR: /* Get interface address */ |
634 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
635 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
636 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
637 | /* Note that these ioctls will not sleep, | |
638 | so that we do not impose a lock. | |
639 | One day we will be forced to put shlock here (I mean SMP) | |
640 | */ | |
641 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
642 | memset(sin, 0, sizeof(*sin)); | |
643 | sin->sin_family = AF_INET; | |
644 | break; | |
645 | ||
646 | case SIOCSIFFLAGS: | |
647 | ret = -EACCES; | |
648 | if (!capable(CAP_NET_ADMIN)) | |
649 | goto out; | |
650 | break; | |
651 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
652 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
653 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
654 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
655 | ret = -EACCES; | |
656 | if (!capable(CAP_NET_ADMIN)) | |
657 | goto out; | |
658 | ret = -EINVAL; | |
659 | if (sin->sin_family != AF_INET) | |
660 | goto out; | |
661 | break; | |
662 | default: | |
663 | ret = -EINVAL; | |
664 | goto out; | |
665 | } | |
666 | ||
667 | rtnl_lock(); | |
668 | ||
669 | ret = -ENODEV; | |
881d966b | 670 | if ((dev = __dev_get_by_name(&init_net, ifr.ifr_name)) == NULL) |
1da177e4 LT |
671 | goto done; |
672 | ||
673 | if (colon) | |
674 | *colon = ':'; | |
675 | ||
e5ed6399 | 676 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
677 | if (tryaddrmatch) { |
678 | /* Matthias Andree */ | |
679 | /* compare label and address (4.4BSD style) */ | |
680 | /* note: we only do this for a limited set of ioctls | |
681 | and only if the original address family was AF_INET. | |
682 | This is checked above. */ | |
683 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
684 | ifap = &ifa->ifa_next) { | |
685 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
686 | sin_orig.sin_addr.s_addr == | |
687 | ifa->ifa_address) { | |
688 | break; /* found */ | |
689 | } | |
690 | } | |
691 | } | |
692 | /* we didn't get a match, maybe the application is | |
693 | 4.3BSD-style and passed in junk so we fall back to | |
694 | comparing just the label */ | |
695 | if (!ifa) { | |
696 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
697 | ifap = &ifa->ifa_next) | |
698 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
699 | break; | |
700 | } | |
701 | } | |
702 | ||
703 | ret = -EADDRNOTAVAIL; | |
704 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
705 | goto done; | |
706 | ||
132adf54 | 707 | switch (cmd) { |
1da177e4 LT |
708 | case SIOCGIFADDR: /* Get interface address */ |
709 | sin->sin_addr.s_addr = ifa->ifa_local; | |
710 | goto rarok; | |
711 | ||
712 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
713 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
714 | goto rarok; | |
715 | ||
716 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
717 | sin->sin_addr.s_addr = ifa->ifa_address; | |
718 | goto rarok; | |
719 | ||
720 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
721 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
722 | goto rarok; | |
723 | ||
724 | case SIOCSIFFLAGS: | |
725 | if (colon) { | |
726 | ret = -EADDRNOTAVAIL; | |
727 | if (!ifa) | |
728 | break; | |
729 | ret = 0; | |
730 | if (!(ifr.ifr_flags & IFF_UP)) | |
731 | inet_del_ifa(in_dev, ifap, 1); | |
732 | break; | |
733 | } | |
734 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
735 | break; | |
736 | ||
737 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
738 | ret = -EINVAL; | |
739 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
740 | break; | |
741 | ||
742 | if (!ifa) { | |
743 | ret = -ENOBUFS; | |
744 | if ((ifa = inet_alloc_ifa()) == NULL) | |
745 | break; | |
746 | if (colon) | |
747 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
748 | else | |
749 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
750 | } else { | |
751 | ret = 0; | |
752 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
753 | break; | |
754 | inet_del_ifa(in_dev, ifap, 0); | |
755 | ifa->ifa_broadcast = 0; | |
756 | ifa->ifa_anycast = 0; | |
757 | } | |
758 | ||
759 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
760 | ||
761 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
762 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
763 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
764 | if ((dev->flags & IFF_BROADCAST) && | |
765 | ifa->ifa_prefixlen < 31) | |
766 | ifa->ifa_broadcast = ifa->ifa_address | | |
767 | ~ifa->ifa_mask; | |
768 | } else { | |
769 | ifa->ifa_prefixlen = 32; | |
770 | ifa->ifa_mask = inet_make_mask(32); | |
771 | } | |
772 | ret = inet_set_ifa(dev, ifa); | |
773 | break; | |
774 | ||
775 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
776 | ret = 0; | |
777 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
778 | inet_del_ifa(in_dev, ifap, 0); | |
779 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
780 | inet_insert_ifa(ifa); | |
781 | } | |
782 | break; | |
783 | ||
784 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
785 | ret = 0; | |
786 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
787 | break; | |
788 | ret = -EINVAL; | |
789 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
790 | break; | |
791 | ret = 0; | |
792 | inet_del_ifa(in_dev, ifap, 0); | |
793 | ifa->ifa_address = sin->sin_addr.s_addr; | |
794 | inet_insert_ifa(ifa); | |
795 | break; | |
796 | ||
797 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
798 | ||
799 | /* | |
800 | * The mask we set must be legal. | |
801 | */ | |
802 | ret = -EINVAL; | |
803 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
804 | break; | |
805 | ret = 0; | |
806 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 807 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
808 | inet_del_ifa(in_dev, ifap, 0); |
809 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
810 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
811 | ||
812 | /* See if current broadcast address matches | |
813 | * with current netmask, then recalculate | |
814 | * the broadcast address. Otherwise it's a | |
815 | * funny address, so don't touch it since | |
816 | * the user seems to know what (s)he's doing... | |
817 | */ | |
818 | if ((dev->flags & IFF_BROADCAST) && | |
819 | (ifa->ifa_prefixlen < 31) && | |
820 | (ifa->ifa_broadcast == | |
dcab5e1e | 821 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
822 | ifa->ifa_broadcast = (ifa->ifa_local | |
823 | ~sin->sin_addr.s_addr); | |
824 | } | |
825 | inet_insert_ifa(ifa); | |
826 | } | |
827 | break; | |
828 | } | |
829 | done: | |
830 | rtnl_unlock(); | |
831 | out: | |
832 | return ret; | |
833 | rarok: | |
834 | rtnl_unlock(); | |
835 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
836 | goto out; | |
837 | } | |
838 | ||
839 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
840 | { | |
e5ed6399 | 841 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
842 | struct in_ifaddr *ifa; |
843 | struct ifreq ifr; | |
844 | int done = 0; | |
845 | ||
846 | if (!in_dev || (ifa = in_dev->ifa_list) == NULL) | |
847 | goto out; | |
848 | ||
849 | for (; ifa; ifa = ifa->ifa_next) { | |
850 | if (!buf) { | |
851 | done += sizeof(ifr); | |
852 | continue; | |
853 | } | |
854 | if (len < (int) sizeof(ifr)) | |
855 | break; | |
856 | memset(&ifr, 0, sizeof(struct ifreq)); | |
857 | if (ifa->ifa_label) | |
858 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
859 | else | |
860 | strcpy(ifr.ifr_name, dev->name); | |
861 | ||
862 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
863 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
864 | ifa->ifa_local; | |
865 | ||
866 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
867 | done = -EFAULT; | |
868 | break; | |
869 | } | |
870 | buf += sizeof(struct ifreq); | |
871 | len -= sizeof(struct ifreq); | |
872 | done += sizeof(struct ifreq); | |
873 | } | |
874 | out: | |
875 | return done; | |
876 | } | |
877 | ||
a61ced5d | 878 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 879 | { |
a61ced5d | 880 | __be32 addr = 0; |
1da177e4 LT |
881 | struct in_device *in_dev; |
882 | ||
883 | rcu_read_lock(); | |
e5ed6399 | 884 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
885 | if (!in_dev) |
886 | goto no_in_dev; | |
887 | ||
888 | for_primary_ifa(in_dev) { | |
889 | if (ifa->ifa_scope > scope) | |
890 | continue; | |
891 | if (!dst || inet_ifa_match(dst, ifa)) { | |
892 | addr = ifa->ifa_local; | |
893 | break; | |
894 | } | |
895 | if (!addr) | |
896 | addr = ifa->ifa_local; | |
897 | } endfor_ifa(in_dev); | |
898 | no_in_dev: | |
899 | rcu_read_unlock(); | |
900 | ||
901 | if (addr) | |
902 | goto out; | |
903 | ||
904 | /* Not loopback addresses on loopback should be preferred | |
905 | in this case. It is importnat that lo is the first interface | |
906 | in dev_base list. | |
907 | */ | |
908 | read_lock(&dev_base_lock); | |
909 | rcu_read_lock(); | |
881d966b | 910 | for_each_netdev(&init_net, dev) { |
e5ed6399 | 911 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) |
1da177e4 LT |
912 | continue; |
913 | ||
914 | for_primary_ifa(in_dev) { | |
915 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
916 | ifa->ifa_scope <= scope) { | |
917 | addr = ifa->ifa_local; | |
918 | goto out_unlock_both; | |
919 | } | |
920 | } endfor_ifa(in_dev); | |
921 | } | |
922 | out_unlock_both: | |
923 | read_unlock(&dev_base_lock); | |
924 | rcu_read_unlock(); | |
925 | out: | |
926 | return addr; | |
927 | } | |
928 | ||
60cad5da AV |
929 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
930 | __be32 local, int scope) | |
1da177e4 LT |
931 | { |
932 | int same = 0; | |
a144ea4b | 933 | __be32 addr = 0; |
1da177e4 LT |
934 | |
935 | for_ifa(in_dev) { | |
936 | if (!addr && | |
937 | (local == ifa->ifa_local || !local) && | |
938 | ifa->ifa_scope <= scope) { | |
939 | addr = ifa->ifa_local; | |
940 | if (same) | |
941 | break; | |
942 | } | |
943 | if (!same) { | |
944 | same = (!local || inet_ifa_match(local, ifa)) && | |
945 | (!dst || inet_ifa_match(dst, ifa)); | |
946 | if (same && addr) { | |
947 | if (local || !dst) | |
948 | break; | |
949 | /* Is the selected addr into dst subnet? */ | |
950 | if (inet_ifa_match(addr, ifa)) | |
951 | break; | |
952 | /* No, then can we use new local src? */ | |
953 | if (ifa->ifa_scope <= scope) { | |
954 | addr = ifa->ifa_local; | |
955 | break; | |
956 | } | |
957 | /* search for large dst subnet for addr */ | |
958 | same = 0; | |
959 | } | |
960 | } | |
961 | } endfor_ifa(in_dev); | |
962 | ||
963 | return same? addr : 0; | |
964 | } | |
965 | ||
966 | /* | |
967 | * Confirm that local IP address exists using wildcards: | |
968 | * - dev: only on this interface, 0=any interface | |
969 | * - dst: only in the same subnet as dst, 0=any dst | |
970 | * - local: address, 0=autoselect the local address | |
971 | * - scope: maximum allowed scope value for the local address | |
972 | */ | |
60cad5da | 973 | __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope) |
1da177e4 | 974 | { |
60cad5da | 975 | __be32 addr = 0; |
1da177e4 LT |
976 | struct in_device *in_dev; |
977 | ||
978 | if (dev) { | |
979 | rcu_read_lock(); | |
e5ed6399 | 980 | if ((in_dev = __in_dev_get_rcu(dev))) |
1da177e4 LT |
981 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
982 | rcu_read_unlock(); | |
983 | ||
984 | return addr; | |
985 | } | |
986 | ||
987 | read_lock(&dev_base_lock); | |
988 | rcu_read_lock(); | |
881d966b | 989 | for_each_netdev(&init_net, dev) { |
e5ed6399 | 990 | if ((in_dev = __in_dev_get_rcu(dev))) { |
1da177e4 LT |
991 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
992 | if (addr) | |
993 | break; | |
994 | } | |
995 | } | |
996 | rcu_read_unlock(); | |
997 | read_unlock(&dev_base_lock); | |
998 | ||
999 | return addr; | |
1000 | } | |
1001 | ||
1002 | /* | |
1003 | * Device notifier | |
1004 | */ | |
1005 | ||
1006 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1007 | { | |
e041c683 | 1008 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1012 | { | |
e041c683 | 1013 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 LT |
1014 | } |
1015 | ||
1016 | /* Rename ifa_labels for a device name change. Make some effort to preserve existing | |
1017 | * alias numbering and to create unique labels if possible. | |
1018 | */ | |
1019 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1020 | { |
1da177e4 LT |
1021 | struct in_ifaddr *ifa; |
1022 | int named = 0; | |
1023 | ||
e905a9ed YH |
1024 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1025 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1026 | |
1027 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1028 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 LT |
1029 | if (named++ == 0) |
1030 | continue; | |
44344b2a | 1031 | dot = strchr(old, ':'); |
e905a9ed YH |
1032 | if (dot == NULL) { |
1033 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1034 | dot = old; |
1035 | } | |
e905a9ed YH |
1036 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { |
1037 | strcat(ifa->ifa_label, dot); | |
1038 | } else { | |
1039 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
1040 | } | |
1041 | } | |
1042 | } | |
1da177e4 LT |
1043 | |
1044 | /* Called only under RTNL semaphore */ | |
1045 | ||
1046 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1047 | void *ptr) | |
1048 | { | |
1049 | struct net_device *dev = ptr; | |
e5ed6399 | 1050 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 | 1051 | |
e9dc8653 EB |
1052 | if (dev->nd_net != &init_net) |
1053 | return NOTIFY_DONE; | |
1054 | ||
1da177e4 LT |
1055 | ASSERT_RTNL(); |
1056 | ||
1057 | if (!in_dev) { | |
8030f544 | 1058 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1059 | in_dev = inetdev_init(dev); |
b217d616 HX |
1060 | if (!in_dev) |
1061 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1062 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1063 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1064 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1065 | } |
1da177e4 LT |
1066 | } |
1067 | goto out; | |
1068 | } | |
1069 | ||
1070 | switch (event) { | |
1071 | case NETDEV_REGISTER: | |
1072 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1073 | dev->ip_ptr = NULL; | |
1074 | break; | |
1075 | case NETDEV_UP: | |
1076 | if (dev->mtu < 68) | |
1077 | break; | |
0cc217e1 | 1078 | if (dev->flags & IFF_LOOPBACK) { |
1da177e4 LT |
1079 | struct in_ifaddr *ifa; |
1080 | if ((ifa = inet_alloc_ifa()) != NULL) { | |
1081 | ifa->ifa_local = | |
1082 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1083 | ifa->ifa_prefixlen = 8; | |
1084 | ifa->ifa_mask = inet_make_mask(8); | |
1085 | in_dev_hold(in_dev); | |
1086 | ifa->ifa_dev = in_dev; | |
1087 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1088 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1089 | inet_insert_ifa(ifa); | |
1090 | } | |
1091 | } | |
1092 | ip_mc_up(in_dev); | |
1093 | break; | |
1094 | case NETDEV_DOWN: | |
1095 | ip_mc_down(in_dev); | |
1096 | break; | |
1097 | case NETDEV_CHANGEMTU: | |
1098 | if (dev->mtu >= 68) | |
1099 | break; | |
1100 | /* MTU falled under 68, disable IP */ | |
1101 | case NETDEV_UNREGISTER: | |
1102 | inetdev_destroy(in_dev); | |
1103 | break; | |
1104 | case NETDEV_CHANGENAME: | |
1105 | /* Do not notify about label change, this event is | |
1106 | * not interesting to applications using netlink. | |
1107 | */ | |
1108 | inetdev_changename(dev, in_dev); | |
1109 | ||
51602b2a | 1110 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1111 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1112 | break; |
1113 | } | |
1114 | out: | |
1115 | return NOTIFY_DONE; | |
1116 | } | |
1117 | ||
1118 | static struct notifier_block ip_netdev_notifier = { | |
1119 | .notifier_call =inetdev_event, | |
1120 | }; | |
1121 | ||
339bf98f TG |
1122 | static inline size_t inet_nlmsg_size(void) |
1123 | { | |
1124 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1125 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1126 | + nla_total_size(4) /* IFA_LOCAL */ | |
1127 | + nla_total_size(4) /* IFA_BROADCAST */ | |
1128 | + nla_total_size(4) /* IFA_ANYCAST */ | |
1129 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ | |
1130 | } | |
1131 | ||
1da177e4 | 1132 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1133 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1134 | { |
1135 | struct ifaddrmsg *ifm; | |
1136 | struct nlmsghdr *nlh; | |
1da177e4 | 1137 | |
47f68512 TG |
1138 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1139 | if (nlh == NULL) | |
26932566 | 1140 | return -EMSGSIZE; |
47f68512 TG |
1141 | |
1142 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1143 | ifm->ifa_family = AF_INET; |
1144 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1145 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1146 | ifm->ifa_scope = ifa->ifa_scope; | |
1147 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1148 | |
1da177e4 | 1149 | if (ifa->ifa_address) |
a7a628c4 | 1150 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1151 | |
1da177e4 | 1152 | if (ifa->ifa_local) |
a7a628c4 | 1153 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1154 | |
1da177e4 | 1155 | if (ifa->ifa_broadcast) |
a7a628c4 | 1156 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1157 | |
1da177e4 | 1158 | if (ifa->ifa_anycast) |
a7a628c4 | 1159 | NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast); |
47f68512 | 1160 | |
1da177e4 | 1161 | if (ifa->ifa_label[0]) |
47f68512 | 1162 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1163 | |
47f68512 TG |
1164 | return nlmsg_end(skb, nlh); |
1165 | ||
1166 | nla_put_failure: | |
26932566 PM |
1167 | nlmsg_cancel(skb, nlh); |
1168 | return -EMSGSIZE; | |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1172 | { | |
b854272b | 1173 | struct net *net = skb->sk->sk_net; |
1da177e4 LT |
1174 | int idx, ip_idx; |
1175 | struct net_device *dev; | |
1176 | struct in_device *in_dev; | |
1177 | struct in_ifaddr *ifa; | |
1178 | int s_ip_idx, s_idx = cb->args[0]; | |
1179 | ||
b854272b DL |
1180 | if (net != &init_net) |
1181 | return 0; | |
1182 | ||
1da177e4 | 1183 | s_ip_idx = ip_idx = cb->args[1]; |
7562f876 | 1184 | idx = 0; |
881d966b | 1185 | for_each_netdev(&init_net, 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 | } | |
97c53cac | 1231 | err = rtnl_notify(skb, &init_net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
d6062cbb TG |
1232 | errout: |
1233 | if (err < 0) | |
97c53cac | 1234 | rtnl_set_sk_err(&init_net, 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); | |
881d966b | 1244 | for_each_netdev(&init_net, dev) { |
31be3085 HX |
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 | ||
68dd299b PE |
1255 | static void inet_forward_change(void) |
1256 | { | |
1257 | struct net_device *dev; | |
1258 | int on = IPV4_DEVCONF_ALL(FORWARDING); | |
1259 | ||
1260 | IPV4_DEVCONF_ALL(ACCEPT_REDIRECTS) = !on; | |
1261 | IPV4_DEVCONF_DFLT(FORWARDING) = on; | |
1262 | ||
1263 | read_lock(&dev_base_lock); | |
1264 | for_each_netdev(&init_net, dev) { | |
1265 | struct in_device *in_dev; | |
1266 | rcu_read_lock(); | |
1267 | in_dev = __in_dev_get_rcu(dev); | |
1268 | if (in_dev) | |
1269 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1270 | rcu_read_unlock(); | |
1271 | } | |
1272 | read_unlock(&dev_base_lock); | |
1273 | ||
1274 | rt_cache_flush(0); | |
1275 | } | |
1276 | ||
31be3085 HX |
1277 | static int devinet_conf_proc(ctl_table *ctl, int write, |
1278 | struct file* filp, void __user *buffer, | |
1279 | size_t *lenp, loff_t *ppos) | |
1280 | { | |
1281 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1282 | ||
1283 | if (write) { | |
1284 | struct ipv4_devconf *cnf = ctl->extra1; | |
1285 | int i = (int *)ctl->data - cnf->data; | |
1286 | ||
1287 | set_bit(i, cnf->state); | |
1288 | ||
1289 | if (cnf == &ipv4_devconf_dflt) | |
1290 | devinet_copy_dflt_conf(i); | |
1291 | } | |
1292 | ||
1293 | return ret; | |
1294 | } | |
1295 | ||
1296 | static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen, | |
1297 | void __user *oldval, size_t __user *oldlenp, | |
1298 | void __user *newval, size_t newlen) | |
1299 | { | |
1300 | struct ipv4_devconf *cnf; | |
1301 | int *valp = table->data; | |
1302 | int new; | |
1303 | int i; | |
1304 | ||
1305 | if (!newval || !newlen) | |
1306 | return 0; | |
1307 | ||
1308 | if (newlen != sizeof(int)) | |
1309 | return -EINVAL; | |
1310 | ||
1311 | if (get_user(new, (int __user *)newval)) | |
1312 | return -EFAULT; | |
1313 | ||
1314 | if (new == *valp) | |
1315 | return 0; | |
1316 | ||
1317 | if (oldval && oldlenp) { | |
1318 | size_t len; | |
1319 | ||
1320 | if (get_user(len, oldlenp)) | |
1321 | return -EFAULT; | |
1322 | ||
1323 | if (len) { | |
1324 | if (len > table->maxlen) | |
1325 | len = table->maxlen; | |
1326 | if (copy_to_user(oldval, valp, len)) | |
1327 | return -EFAULT; | |
1328 | if (put_user(len, oldlenp)) | |
1329 | return -EFAULT; | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | *valp = new; | |
1334 | ||
1335 | cnf = table->extra1; | |
1336 | i = (int *)table->data - cnf->data; | |
1337 | ||
1338 | set_bit(i, cnf->state); | |
1339 | ||
1340 | if (cnf == &ipv4_devconf_dflt) | |
1341 | devinet_copy_dflt_conf(i); | |
1342 | ||
1343 | return 1; | |
1344 | } | |
1345 | ||
1da177e4 LT |
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; | |
bfada697 PE |
1422 | struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; |
1423 | char *dev_name; | |
1da177e4 LT |
1424 | } devinet_sysctl = { |
1425 | .devinet_vars = { | |
42f811b8 | 1426 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
31be3085 HX |
1427 | devinet_sysctl_forward, |
1428 | devinet_conf_sysctl), | |
42f811b8 HX |
1429 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1430 | ||
1431 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1432 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1433 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1434 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1435 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1436 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1437 | "accept_source_route"), | |
1438 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), | |
1439 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1440 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1441 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1442 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1443 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1444 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1445 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1446 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
1447 | ||
1448 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1449 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1450 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1451 | "force_igmp_version"), | |
1452 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1453 | "promote_secondaries"), | |
1da177e4 | 1454 | }, |
1da177e4 LT |
1455 | }; |
1456 | ||
ea40b324 PE |
1457 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
1458 | int ctl_name, struct ipv4_devconf *p) | |
1da177e4 LT |
1459 | { |
1460 | int i; | |
9fa89642 | 1461 | struct devinet_sysctl_table *t; |
1da177e4 | 1462 | |
bfada697 PE |
1463 | #define DEVINET_CTL_PATH_DEV 3 |
1464 | ||
1465 | struct ctl_path devinet_ctl_path[] = { | |
1466 | { .procname = "net", .ctl_name = CTL_NET, }, | |
1467 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1468 | { .procname = "conf", .ctl_name = NET_IPV4_CONF, }, | |
1469 | { /* to be set */ }, | |
1470 | { }, | |
1471 | }; | |
1472 | ||
9fa89642 | 1473 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1474 | if (!t) |
9fa89642 PE |
1475 | goto out; |
1476 | ||
1da177e4 LT |
1477 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1478 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1479 | t->devinet_vars[i].extra1 = p; |
1da177e4 LT |
1480 | } |
1481 | ||
e905a9ed YH |
1482 | /* |
1483 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1484 | * by sysctl and we wouldn't want anyone to change it under our feet |
1485 | * (see SIOCSIFNAME). | |
e905a9ed | 1486 | */ |
bfada697 PE |
1487 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1488 | if (!t->dev_name) | |
9fa89642 | 1489 | goto free; |
1da177e4 | 1490 | |
bfada697 PE |
1491 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1492 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name; | |
1da177e4 | 1493 | |
bfada697 PE |
1494 | t->sysctl_header = register_sysctl_paths(devinet_ctl_path, |
1495 | t->devinet_vars); | |
1da177e4 | 1496 | if (!t->sysctl_header) |
9fa89642 | 1497 | goto free_procname; |
1da177e4 LT |
1498 | |
1499 | p->sysctl = t; | |
ea40b324 | 1500 | return 0; |
1da177e4 | 1501 | |
9fa89642 | 1502 | free_procname: |
bfada697 | 1503 | kfree(t->dev_name); |
9fa89642 | 1504 | free: |
1da177e4 | 1505 | kfree(t); |
9fa89642 | 1506 | out: |
ea40b324 | 1507 | return -ENOBUFS; |
1da177e4 LT |
1508 | } |
1509 | ||
51602b2a PE |
1510 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1511 | { | |
1512 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1513 | ||
1514 | if (t == NULL) | |
1515 | return; | |
1516 | ||
1517 | cnf->sysctl = NULL; | |
1518 | unregister_sysctl_table(t->sysctl_header); | |
1519 | kfree(t->dev_name); | |
1520 | kfree(t); | |
1521 | } | |
1522 | ||
66f27a52 PE |
1523 | static void devinet_sysctl_register(struct in_device *idev) |
1524 | { | |
51602b2a PE |
1525 | neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4, |
1526 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
1527 | __devinet_sysctl_register(idev->dev->name, idev->dev->ifindex, | |
66f27a52 PE |
1528 | &idev->cnf); |
1529 | } | |
1530 | ||
51602b2a | 1531 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1532 | { |
51602b2a PE |
1533 | __devinet_sysctl_unregister(&idev->cnf); |
1534 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 LT |
1535 | } |
1536 | #endif | |
1537 | ||
68dd299b PE |
1538 | static struct ctl_table ctl_forward_entry[] = { |
1539 | { | |
1540 | .ctl_name = NET_IPV4_FORWARD, | |
1541 | .procname = "ip_forward", | |
1542 | .data = &ipv4_devconf.data[ | |
1543 | NET_IPV4_CONF_FORWARDING - 1], | |
1544 | .maxlen = sizeof(int), | |
1545 | .mode = 0644, | |
1546 | .proc_handler = devinet_sysctl_forward, | |
1547 | .strategy = devinet_conf_sysctl, | |
1548 | .extra1 = &ipv4_devconf, | |
1549 | }, | |
1550 | { }, | |
1551 | }; | |
1552 | ||
1553 | static __initdata struct ctl_path net_ipv4_path[] = { | |
1554 | { .procname = "net", .ctl_name = CTL_NET, }, | |
1555 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1556 | { }, | |
1557 | }; | |
1558 | ||
1da177e4 LT |
1559 | void __init devinet_init(void) |
1560 | { | |
1561 | register_gifconf(PF_INET, inet_gifconf); | |
1562 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f TG |
1563 | |
1564 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1565 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1566 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 | 1567 | #ifdef CONFIG_SYSCTL |
66f27a52 PE |
1568 | __devinet_sysctl_register("all", NET_PROTO_CONF_ALL, |
1569 | &ipv4_devconf); | |
1570 | __devinet_sysctl_register("default", NET_PROTO_CONF_DEFAULT, | |
1571 | &ipv4_devconf_dflt); | |
68dd299b | 1572 | register_sysctl_paths(net_ipv4_path, ctl_forward_entry); |
1da177e4 LT |
1573 | #endif |
1574 | } | |
1575 | ||
1da177e4 LT |
1576 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1577 | EXPORT_SYMBOL(inet_select_addr); | |
1578 | EXPORT_SYMBOL(inetdev_by_index); | |
1579 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
1580 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |