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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> |
752d14dc | 65 | #include <net/net_namespace.h> |
1da177e4 LT |
66 | |
67 | struct ipv4_devconf ipv4_devconf = { | |
42f811b8 HX |
68 | .data = { |
69 | [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1, | |
70 | [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1, | |
71 | [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1, | |
72 | [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1, | |
73 | }, | |
1da177e4 LT |
74 | }; |
75 | ||
76 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
42f811b8 HX |
77 | .data = { |
78 | [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1, | |
79 | [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1, | |
80 | [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1, | |
81 | [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1, | |
82 | [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1, | |
83 | }, | |
1da177e4 LT |
84 | }; |
85 | ||
42f811b8 HX |
86 | #define IPV4_DEVCONF_DFLT(attr) IPV4_DEVCONF(ipv4_devconf_dflt, attr) |
87 | ||
ef7c79ed | 88 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
89 | [IFA_LOCAL] = { .type = NLA_U32 }, |
90 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
91 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
92 | [IFA_ANYCAST] = { .type = NLA_U32 }, | |
5176f91e | 93 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c753978 TG |
94 | }; |
95 | ||
d6062cbb | 96 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 97 | |
e041c683 | 98 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
99 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
100 | int destroy); | |
101 | #ifdef CONFIG_SYSCTL | |
66f27a52 | 102 | static void devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
103 | static void devinet_sysctl_unregister(struct in_device *idev); |
104 | #else | |
105 | static inline void devinet_sysctl_register(struct in_device *idev) | |
106 | { | |
107 | } | |
108 | static inline void devinet_sysctl_unregister(struct in_device *idev) | |
109 | { | |
110 | } | |
1da177e4 LT |
111 | #endif |
112 | ||
113 | /* Locks all the inet devices. */ | |
114 | ||
115 | static struct in_ifaddr *inet_alloc_ifa(void) | |
116 | { | |
0da974f4 | 117 | struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); |
1da177e4 LT |
118 | |
119 | if (ifa) { | |
1da177e4 LT |
120 | INIT_RCU_HEAD(&ifa->rcu_head); |
121 | } | |
122 | ||
123 | return ifa; | |
124 | } | |
125 | ||
126 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
127 | { | |
128 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
129 | if (ifa->ifa_dev) | |
130 | in_dev_put(ifa->ifa_dev); | |
131 | kfree(ifa); | |
132 | } | |
133 | ||
134 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
135 | { | |
136 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
137 | } | |
138 | ||
139 | void in_dev_finish_destroy(struct in_device *idev) | |
140 | { | |
141 | struct net_device *dev = idev->dev; | |
142 | ||
143 | BUG_TRAP(!idev->ifa_list); | |
144 | BUG_TRAP(!idev->mc_list); | |
145 | #ifdef NET_REFCNT_DEBUG | |
146 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
147 | idev, dev ? dev->name : "NIL"); | |
148 | #endif | |
149 | dev_put(dev); | |
150 | if (!idev->dead) | |
151 | printk("Freeing alive in_device %p\n", idev); | |
152 | else { | |
153 | kfree(idev); | |
154 | } | |
155 | } | |
156 | ||
71e27da9 | 157 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
158 | { |
159 | struct in_device *in_dev; | |
160 | ||
161 | ASSERT_RTNL(); | |
162 | ||
0da974f4 | 163 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
164 | if (!in_dev) |
165 | goto out; | |
1da177e4 LT |
166 | INIT_RCU_HEAD(&in_dev->rcu_head); |
167 | memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf)); | |
168 | in_dev->cnf.sysctl = NULL; | |
169 | in_dev->dev = dev; | |
170 | if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) | |
171 | goto out_kfree; | |
172 | /* Reference in_dev->dev */ | |
173 | dev_hold(dev); | |
30c4cf57 | 174 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 175 | in_dev_hold(in_dev); |
1da177e4 | 176 | |
66f27a52 | 177 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
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; | |
1da177e4 LT |
206 | |
207 | in_dev->dead = 1; | |
208 | ||
209 | ip_mc_destroy_dev(in_dev); | |
210 | ||
211 | while ((ifa = in_dev->ifa_list) != NULL) { | |
212 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
213 | inet_free_ifa(ifa); | |
214 | } | |
215 | ||
1da177e4 LT |
216 | dev->ip_ptr = NULL; |
217 | ||
51602b2a | 218 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
219 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
220 | arp_ifdown(dev); | |
221 | ||
222 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
223 | } | |
224 | ||
ff428d72 | 225 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
226 | { |
227 | rcu_read_lock(); | |
228 | for_primary_ifa(in_dev) { | |
229 | if (inet_ifa_match(a, ifa)) { | |
230 | if (!b || inet_ifa_match(b, ifa)) { | |
231 | rcu_read_unlock(); | |
232 | return 1; | |
233 | } | |
234 | } | |
235 | } endfor_ifa(in_dev); | |
236 | rcu_read_unlock(); | |
237 | return 0; | |
238 | } | |
239 | ||
d6062cbb TG |
240 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
241 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 242 | { |
8f937c60 | 243 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
244 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
245 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
246 | struct in_ifaddr *prev_prom = NULL; | |
247 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
248 | |
249 | ASSERT_RTNL(); | |
250 | ||
e905a9ed | 251 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
252 | * unless alias promotion is set |
253 | **/ | |
1da177e4 LT |
254 | |
255 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
256 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
257 | ||
258 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 259 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
260 | ifa1->ifa_scope <= ifa->ifa_scope) |
261 | last_prim = ifa; | |
262 | ||
1da177e4 LT |
263 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
264 | ifa1->ifa_mask != ifa->ifa_mask || | |
265 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
266 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 267 | prev_prom = ifa; |
1da177e4 LT |
268 | continue; |
269 | } | |
270 | ||
0ff60a45 | 271 | if (!do_promote) { |
8f937c60 | 272 | *ifap1 = ifa->ifa_next; |
1da177e4 | 273 | |
d6062cbb | 274 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
275 | blocking_notifier_call_chain(&inetaddr_chain, |
276 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
277 | inet_free_ifa(ifa); |
278 | } else { | |
279 | promote = ifa; | |
280 | break; | |
281 | } | |
1da177e4 LT |
282 | } |
283 | } | |
284 | ||
285 | /* 2. Unlink it */ | |
286 | ||
287 | *ifap = ifa1->ifa_next; | |
288 | ||
289 | /* 3. Announce address deletion */ | |
290 | ||
291 | /* Send message first, then call notifier. | |
292 | At first sight, FIB update triggered by notifier | |
293 | will refer to already deleted ifaddr, that could confuse | |
294 | netlink listeners. It is not true: look, gated sees | |
295 | that route deleted and if it still thinks that ifaddr | |
296 | is valid, it will try to restore deleted routes... Grr. | |
297 | So that, this order is correct. | |
298 | */ | |
d6062cbb | 299 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 300 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 301 | |
0ff60a45 JHS |
302 | if (promote) { |
303 | ||
304 | if (prev_prom) { | |
305 | prev_prom->ifa_next = promote->ifa_next; | |
306 | promote->ifa_next = last_prim->ifa_next; | |
307 | last_prim->ifa_next = promote; | |
308 | } | |
8f937c60 | 309 | |
8f937c60 | 310 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 311 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
312 | blocking_notifier_call_chain(&inetaddr_chain, |
313 | NETDEV_UP, promote); | |
0ff60a45 JHS |
314 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
315 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
316 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
317 | continue; | |
318 | fib_add_ifaddr(ifa); | |
319 | } | |
320 | ||
321 | } | |
6363097c | 322 | if (destroy) |
0ff60a45 | 323 | inet_free_ifa(ifa1); |
1da177e4 LT |
324 | } |
325 | ||
d6062cbb TG |
326 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
327 | int destroy) | |
328 | { | |
329 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
330 | } | |
331 | ||
332 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
333 | u32 pid) | |
1da177e4 LT |
334 | { |
335 | struct in_device *in_dev = ifa->ifa_dev; | |
336 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
337 | ||
338 | ASSERT_RTNL(); | |
339 | ||
340 | if (!ifa->ifa_local) { | |
341 | inet_free_ifa(ifa); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
346 | last_primary = &in_dev->ifa_list; | |
347 | ||
348 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
349 | ifap = &ifa1->ifa_next) { | |
350 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
351 | ifa->ifa_scope <= ifa1->ifa_scope) | |
352 | last_primary = &ifa1->ifa_next; | |
353 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
354 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
355 | if (ifa1->ifa_local == ifa->ifa_local) { | |
356 | inet_free_ifa(ifa); | |
357 | return -EEXIST; | |
358 | } | |
359 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
360 | inet_free_ifa(ifa); | |
361 | return -EINVAL; | |
362 | } | |
363 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
364 | } | |
365 | } | |
366 | ||
367 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
368 | net_srandom(ifa->ifa_local); | |
369 | ifap = last_primary; | |
370 | } | |
371 | ||
372 | ifa->ifa_next = *ifap; | |
373 | *ifap = ifa; | |
374 | ||
375 | /* Send message first, then call notifier. | |
376 | Notifier will trigger FIB update, so that | |
377 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 378 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 379 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
380 | |
381 | return 0; | |
382 | } | |
383 | ||
d6062cbb TG |
384 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
385 | { | |
386 | return __inet_insert_ifa(ifa, NULL, 0); | |
387 | } | |
388 | ||
1da177e4 LT |
389 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
390 | { | |
e5ed6399 | 391 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
392 | |
393 | ASSERT_RTNL(); | |
394 | ||
395 | if (!in_dev) { | |
71e27da9 HX |
396 | inet_free_ifa(ifa); |
397 | return -ENOBUFS; | |
1da177e4 | 398 | } |
71e27da9 | 399 | ipv4_devconf_setall(in_dev); |
1da177e4 LT |
400 | if (ifa->ifa_dev != in_dev) { |
401 | BUG_TRAP(!ifa->ifa_dev); | |
402 | in_dev_hold(in_dev); | |
403 | ifa->ifa_dev = in_dev; | |
404 | } | |
405 | if (LOOPBACK(ifa->ifa_local)) | |
406 | ifa->ifa_scope = RT_SCOPE_HOST; | |
407 | return inet_insert_ifa(ifa); | |
408 | } | |
409 | ||
410 | struct in_device *inetdev_by_index(int ifindex) | |
411 | { | |
412 | struct net_device *dev; | |
413 | struct in_device *in_dev = NULL; | |
414 | read_lock(&dev_base_lock); | |
881d966b | 415 | dev = __dev_get_by_index(&init_net, ifindex); |
1da177e4 LT |
416 | if (dev) |
417 | in_dev = in_dev_get(dev); | |
418 | read_unlock(&dev_base_lock); | |
419 | return in_dev; | |
420 | } | |
421 | ||
422 | /* Called only from RTNL semaphored context. No locks. */ | |
423 | ||
60cad5da AV |
424 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
425 | __be32 mask) | |
1da177e4 LT |
426 | { |
427 | ASSERT_RTNL(); | |
428 | ||
429 | for_primary_ifa(in_dev) { | |
430 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
431 | return ifa; | |
432 | } endfor_ifa(in_dev); | |
433 | return NULL; | |
434 | } | |
435 | ||
436 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
437 | { | |
b854272b | 438 | struct net *net = skb->sk->sk_net; |
dfdd5fd4 | 439 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 440 | struct in_device *in_dev; |
dfdd5fd4 | 441 | struct ifaddrmsg *ifm; |
1da177e4 | 442 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 443 | int err = -EINVAL; |
1da177e4 LT |
444 | |
445 | ASSERT_RTNL(); | |
446 | ||
b854272b DL |
447 | if (net != &init_net) |
448 | return -EINVAL; | |
449 | ||
dfdd5fd4 TG |
450 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
451 | if (err < 0) | |
452 | goto errout; | |
453 | ||
454 | ifm = nlmsg_data(nlh); | |
455 | in_dev = inetdev_by_index(ifm->ifa_index); | |
456 | if (in_dev == NULL) { | |
457 | err = -ENODEV; | |
458 | goto errout; | |
459 | } | |
460 | ||
1da177e4 LT |
461 | __in_dev_put(in_dev); |
462 | ||
463 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
464 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 465 | if (tb[IFA_LOCAL] && |
a7a628c4 | 466 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
467 | continue; |
468 | ||
469 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 470 | continue; |
dfdd5fd4 TG |
471 | |
472 | if (tb[IFA_ADDRESS] && | |
473 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 474 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
475 | continue; |
476 | ||
d6062cbb | 477 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
478 | return 0; |
479 | } | |
dfdd5fd4 TG |
480 | |
481 | err = -EADDRNOTAVAIL; | |
482 | errout: | |
483 | return err; | |
1da177e4 LT |
484 | } |
485 | ||
5c753978 | 486 | static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh) |
1da177e4 | 487 | { |
5c753978 TG |
488 | struct nlattr *tb[IFA_MAX+1]; |
489 | struct in_ifaddr *ifa; | |
490 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
491 | struct net_device *dev; |
492 | struct in_device *in_dev; | |
5c753978 | 493 | int err = -EINVAL; |
1da177e4 | 494 | |
5c753978 TG |
495 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
496 | if (err < 0) | |
497 | goto errout; | |
1da177e4 | 498 | |
5c753978 | 499 | ifm = nlmsg_data(nlh); |
c4e38f41 EP |
500 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) { |
501 | err = -EINVAL; | |
5c753978 | 502 | goto errout; |
c4e38f41 | 503 | } |
1da177e4 | 504 | |
881d966b | 505 | dev = __dev_get_by_index(&init_net, ifm->ifa_index); |
5c753978 TG |
506 | if (dev == NULL) { |
507 | err = -ENODEV; | |
508 | goto errout; | |
509 | } | |
1da177e4 | 510 | |
5c753978 TG |
511 | in_dev = __in_dev_get_rtnl(dev); |
512 | if (in_dev == NULL) { | |
71e27da9 HX |
513 | err = -ENOBUFS; |
514 | goto errout; | |
1da177e4 LT |
515 | } |
516 | ||
5c753978 TG |
517 | ifa = inet_alloc_ifa(); |
518 | if (ifa == NULL) { | |
519 | /* | |
520 | * A potential indev allocation can be left alive, it stays | |
521 | * assigned to its device and is destroy with it. | |
522 | */ | |
523 | err = -ENOBUFS; | |
524 | goto errout; | |
525 | } | |
526 | ||
a4e65d36 | 527 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
528 | in_dev_hold(in_dev); |
529 | ||
530 | if (tb[IFA_ADDRESS] == NULL) | |
531 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 532 | |
1da177e4 LT |
533 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
534 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
535 | ifa->ifa_flags = ifm->ifa_flags; |
536 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
537 | ifa->ifa_dev = in_dev; |
538 | ||
a7a628c4 AV |
539 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
540 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
541 | |
542 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 543 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 TG |
544 | |
545 | if (tb[IFA_ANYCAST]) | |
a7a628c4 | 546 | ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]); |
5c753978 TG |
547 | |
548 | if (tb[IFA_LABEL]) | |
549 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
550 | else |
551 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
552 | ||
5c753978 TG |
553 | return ifa; |
554 | ||
555 | errout: | |
556 | return ERR_PTR(err); | |
557 | } | |
558 | ||
559 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
560 | { | |
b854272b | 561 | struct net *net = skb->sk->sk_net; |
5c753978 TG |
562 | struct in_ifaddr *ifa; |
563 | ||
564 | ASSERT_RTNL(); | |
565 | ||
b854272b DL |
566 | if (net != &init_net) |
567 | return -EINVAL; | |
568 | ||
5c753978 TG |
569 | ifa = rtm_to_ifaddr(nlh); |
570 | if (IS_ERR(ifa)) | |
571 | return PTR_ERR(ifa); | |
572 | ||
d6062cbb | 573 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
574 | } |
575 | ||
576 | /* | |
577 | * Determine a default network mask, based on the IP address. | |
578 | */ | |
579 | ||
714e85be | 580 | static __inline__ int inet_abc_len(__be32 addr) |
1da177e4 LT |
581 | { |
582 | int rc = -1; /* Something else, probably a multicast. */ | |
583 | ||
e905a9ed YH |
584 | if (ZERONET(addr)) |
585 | rc = 0; | |
1da177e4 | 586 | else { |
714e85be | 587 | __u32 haddr = ntohl(addr); |
1da177e4 | 588 | |
714e85be | 589 | if (IN_CLASSA(haddr)) |
1da177e4 | 590 | rc = 8; |
714e85be | 591 | else if (IN_CLASSB(haddr)) |
1da177e4 | 592 | rc = 16; |
714e85be | 593 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
594 | rc = 24; |
595 | } | |
596 | ||
e905a9ed | 597 | return rc; |
1da177e4 LT |
598 | } |
599 | ||
600 | ||
601 | int devinet_ioctl(unsigned int cmd, void __user *arg) | |
602 | { | |
603 | struct ifreq ifr; | |
604 | struct sockaddr_in sin_orig; | |
605 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
606 | struct in_device *in_dev; | |
607 | struct in_ifaddr **ifap = NULL; | |
608 | struct in_ifaddr *ifa = NULL; | |
609 | struct net_device *dev; | |
610 | char *colon; | |
611 | int ret = -EFAULT; | |
612 | int tryaddrmatch = 0; | |
613 | ||
614 | /* | |
615 | * Fetch the caller's info block into kernel space | |
616 | */ | |
617 | ||
618 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
619 | goto out; | |
620 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
621 | ||
622 | /* save original address for comparison */ | |
623 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
624 | ||
625 | colon = strchr(ifr.ifr_name, ':'); | |
626 | if (colon) | |
627 | *colon = 0; | |
628 | ||
629 | #ifdef CONFIG_KMOD | |
881d966b | 630 | dev_load(&init_net, ifr.ifr_name); |
1da177e4 LT |
631 | #endif |
632 | ||
132adf54 | 633 | switch (cmd) { |
1da177e4 LT |
634 | case SIOCGIFADDR: /* Get interface address */ |
635 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
636 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
637 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
638 | /* Note that these ioctls will not sleep, | |
639 | so that we do not impose a lock. | |
640 | One day we will be forced to put shlock here (I mean SMP) | |
641 | */ | |
642 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
643 | memset(sin, 0, sizeof(*sin)); | |
644 | sin->sin_family = AF_INET; | |
645 | break; | |
646 | ||
647 | case SIOCSIFFLAGS: | |
648 | ret = -EACCES; | |
649 | if (!capable(CAP_NET_ADMIN)) | |
650 | goto out; | |
651 | break; | |
652 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
653 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
654 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
655 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
656 | ret = -EACCES; | |
657 | if (!capable(CAP_NET_ADMIN)) | |
658 | goto out; | |
659 | ret = -EINVAL; | |
660 | if (sin->sin_family != AF_INET) | |
661 | goto out; | |
662 | break; | |
663 | default: | |
664 | ret = -EINVAL; | |
665 | goto out; | |
666 | } | |
667 | ||
668 | rtnl_lock(); | |
669 | ||
670 | ret = -ENODEV; | |
881d966b | 671 | if ((dev = __dev_get_by_name(&init_net, ifr.ifr_name)) == NULL) |
1da177e4 LT |
672 | goto done; |
673 | ||
674 | if (colon) | |
675 | *colon = ':'; | |
676 | ||
e5ed6399 | 677 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
678 | if (tryaddrmatch) { |
679 | /* Matthias Andree */ | |
680 | /* compare label and address (4.4BSD style) */ | |
681 | /* note: we only do this for a limited set of ioctls | |
682 | and only if the original address family was AF_INET. | |
683 | This is checked above. */ | |
684 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
685 | ifap = &ifa->ifa_next) { | |
686 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
687 | sin_orig.sin_addr.s_addr == | |
688 | ifa->ifa_address) { | |
689 | break; /* found */ | |
690 | } | |
691 | } | |
692 | } | |
693 | /* we didn't get a match, maybe the application is | |
694 | 4.3BSD-style and passed in junk so we fall back to | |
695 | comparing just the label */ | |
696 | if (!ifa) { | |
697 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
698 | ifap = &ifa->ifa_next) | |
699 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
700 | break; | |
701 | } | |
702 | } | |
703 | ||
704 | ret = -EADDRNOTAVAIL; | |
705 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
706 | goto done; | |
707 | ||
132adf54 | 708 | switch (cmd) { |
1da177e4 LT |
709 | case SIOCGIFADDR: /* Get interface address */ |
710 | sin->sin_addr.s_addr = ifa->ifa_local; | |
711 | goto rarok; | |
712 | ||
713 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
714 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
715 | goto rarok; | |
716 | ||
717 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
718 | sin->sin_addr.s_addr = ifa->ifa_address; | |
719 | goto rarok; | |
720 | ||
721 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
722 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
723 | goto rarok; | |
724 | ||
725 | case SIOCSIFFLAGS: | |
726 | if (colon) { | |
727 | ret = -EADDRNOTAVAIL; | |
728 | if (!ifa) | |
729 | break; | |
730 | ret = 0; | |
731 | if (!(ifr.ifr_flags & IFF_UP)) | |
732 | inet_del_ifa(in_dev, ifap, 1); | |
733 | break; | |
734 | } | |
735 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
736 | break; | |
737 | ||
738 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
739 | ret = -EINVAL; | |
740 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
741 | break; | |
742 | ||
743 | if (!ifa) { | |
744 | ret = -ENOBUFS; | |
745 | if ((ifa = inet_alloc_ifa()) == NULL) | |
746 | break; | |
747 | if (colon) | |
748 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
749 | else | |
750 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
751 | } else { | |
752 | ret = 0; | |
753 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
754 | break; | |
755 | inet_del_ifa(in_dev, ifap, 0); | |
756 | ifa->ifa_broadcast = 0; | |
757 | ifa->ifa_anycast = 0; | |
758 | } | |
759 | ||
760 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
761 | ||
762 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
763 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
764 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
765 | if ((dev->flags & IFF_BROADCAST) && | |
766 | ifa->ifa_prefixlen < 31) | |
767 | ifa->ifa_broadcast = ifa->ifa_address | | |
768 | ~ifa->ifa_mask; | |
769 | } else { | |
770 | ifa->ifa_prefixlen = 32; | |
771 | ifa->ifa_mask = inet_make_mask(32); | |
772 | } | |
773 | ret = inet_set_ifa(dev, ifa); | |
774 | break; | |
775 | ||
776 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
777 | ret = 0; | |
778 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
779 | inet_del_ifa(in_dev, ifap, 0); | |
780 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
781 | inet_insert_ifa(ifa); | |
782 | } | |
783 | break; | |
784 | ||
785 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
786 | ret = 0; | |
787 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
788 | break; | |
789 | ret = -EINVAL; | |
790 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
791 | break; | |
792 | ret = 0; | |
793 | inet_del_ifa(in_dev, ifap, 0); | |
794 | ifa->ifa_address = sin->sin_addr.s_addr; | |
795 | inet_insert_ifa(ifa); | |
796 | break; | |
797 | ||
798 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
799 | ||
800 | /* | |
801 | * The mask we set must be legal. | |
802 | */ | |
803 | ret = -EINVAL; | |
804 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
805 | break; | |
806 | ret = 0; | |
807 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 808 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
809 | inet_del_ifa(in_dev, ifap, 0); |
810 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
811 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
812 | ||
813 | /* See if current broadcast address matches | |
814 | * with current netmask, then recalculate | |
815 | * the broadcast address. Otherwise it's a | |
816 | * funny address, so don't touch it since | |
817 | * the user seems to know what (s)he's doing... | |
818 | */ | |
819 | if ((dev->flags & IFF_BROADCAST) && | |
820 | (ifa->ifa_prefixlen < 31) && | |
821 | (ifa->ifa_broadcast == | |
dcab5e1e | 822 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
823 | ifa->ifa_broadcast = (ifa->ifa_local | |
824 | ~sin->sin_addr.s_addr); | |
825 | } | |
826 | inet_insert_ifa(ifa); | |
827 | } | |
828 | break; | |
829 | } | |
830 | done: | |
831 | rtnl_unlock(); | |
832 | out: | |
833 | return ret; | |
834 | rarok: | |
835 | rtnl_unlock(); | |
836 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
837 | goto out; | |
838 | } | |
839 | ||
840 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
841 | { | |
e5ed6399 | 842 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
843 | struct in_ifaddr *ifa; |
844 | struct ifreq ifr; | |
845 | int done = 0; | |
846 | ||
847 | if (!in_dev || (ifa = in_dev->ifa_list) == NULL) | |
848 | goto out; | |
849 | ||
850 | for (; ifa; ifa = ifa->ifa_next) { | |
851 | if (!buf) { | |
852 | done += sizeof(ifr); | |
853 | continue; | |
854 | } | |
855 | if (len < (int) sizeof(ifr)) | |
856 | break; | |
857 | memset(&ifr, 0, sizeof(struct ifreq)); | |
858 | if (ifa->ifa_label) | |
859 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
860 | else | |
861 | strcpy(ifr.ifr_name, dev->name); | |
862 | ||
863 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
864 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
865 | ifa->ifa_local; | |
866 | ||
867 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
868 | done = -EFAULT; | |
869 | break; | |
870 | } | |
871 | buf += sizeof(struct ifreq); | |
872 | len -= sizeof(struct ifreq); | |
873 | done += sizeof(struct ifreq); | |
874 | } | |
875 | out: | |
876 | return done; | |
877 | } | |
878 | ||
a61ced5d | 879 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 880 | { |
a61ced5d | 881 | __be32 addr = 0; |
1da177e4 LT |
882 | struct in_device *in_dev; |
883 | ||
884 | rcu_read_lock(); | |
e5ed6399 | 885 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
886 | if (!in_dev) |
887 | goto no_in_dev; | |
888 | ||
889 | for_primary_ifa(in_dev) { | |
890 | if (ifa->ifa_scope > scope) | |
891 | continue; | |
892 | if (!dst || inet_ifa_match(dst, ifa)) { | |
893 | addr = ifa->ifa_local; | |
894 | break; | |
895 | } | |
896 | if (!addr) | |
897 | addr = ifa->ifa_local; | |
898 | } endfor_ifa(in_dev); | |
899 | no_in_dev: | |
900 | rcu_read_unlock(); | |
901 | ||
902 | if (addr) | |
903 | goto out; | |
904 | ||
905 | /* Not loopback addresses on loopback should be preferred | |
906 | in this case. It is importnat that lo is the first interface | |
907 | in dev_base list. | |
908 | */ | |
909 | read_lock(&dev_base_lock); | |
910 | rcu_read_lock(); | |
881d966b | 911 | for_each_netdev(&init_net, dev) { |
e5ed6399 | 912 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) |
1da177e4 LT |
913 | continue; |
914 | ||
915 | for_primary_ifa(in_dev) { | |
916 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
917 | ifa->ifa_scope <= scope) { | |
918 | addr = ifa->ifa_local; | |
919 | goto out_unlock_both; | |
920 | } | |
921 | } endfor_ifa(in_dev); | |
922 | } | |
923 | out_unlock_both: | |
924 | read_unlock(&dev_base_lock); | |
925 | rcu_read_unlock(); | |
926 | out: | |
927 | return addr; | |
928 | } | |
929 | ||
60cad5da AV |
930 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
931 | __be32 local, int scope) | |
1da177e4 LT |
932 | { |
933 | int same = 0; | |
a144ea4b | 934 | __be32 addr = 0; |
1da177e4 LT |
935 | |
936 | for_ifa(in_dev) { | |
937 | if (!addr && | |
938 | (local == ifa->ifa_local || !local) && | |
939 | ifa->ifa_scope <= scope) { | |
940 | addr = ifa->ifa_local; | |
941 | if (same) | |
942 | break; | |
943 | } | |
944 | if (!same) { | |
945 | same = (!local || inet_ifa_match(local, ifa)) && | |
946 | (!dst || inet_ifa_match(dst, ifa)); | |
947 | if (same && addr) { | |
948 | if (local || !dst) | |
949 | break; | |
950 | /* Is the selected addr into dst subnet? */ | |
951 | if (inet_ifa_match(addr, ifa)) | |
952 | break; | |
953 | /* No, then can we use new local src? */ | |
954 | if (ifa->ifa_scope <= scope) { | |
955 | addr = ifa->ifa_local; | |
956 | break; | |
957 | } | |
958 | /* search for large dst subnet for addr */ | |
959 | same = 0; | |
960 | } | |
961 | } | |
962 | } endfor_ifa(in_dev); | |
963 | ||
964 | return same? addr : 0; | |
965 | } | |
966 | ||
967 | /* | |
968 | * Confirm that local IP address exists using wildcards: | |
969 | * - dev: only on this interface, 0=any interface | |
970 | * - dst: only in the same subnet as dst, 0=any dst | |
971 | * - local: address, 0=autoselect the local address | |
972 | * - scope: maximum allowed scope value for the local address | |
973 | */ | |
60cad5da | 974 | __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope) |
1da177e4 | 975 | { |
60cad5da | 976 | __be32 addr = 0; |
1da177e4 LT |
977 | struct in_device *in_dev; |
978 | ||
979 | if (dev) { | |
980 | rcu_read_lock(); | |
e5ed6399 | 981 | if ((in_dev = __in_dev_get_rcu(dev))) |
1da177e4 LT |
982 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
983 | rcu_read_unlock(); | |
984 | ||
985 | return addr; | |
986 | } | |
987 | ||
988 | read_lock(&dev_base_lock); | |
989 | rcu_read_lock(); | |
881d966b | 990 | for_each_netdev(&init_net, dev) { |
e5ed6399 | 991 | if ((in_dev = __in_dev_get_rcu(dev))) { |
1da177e4 LT |
992 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
993 | if (addr) | |
994 | break; | |
995 | } | |
996 | } | |
997 | rcu_read_unlock(); | |
998 | read_unlock(&dev_base_lock); | |
999 | ||
1000 | return addr; | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * Device notifier | |
1005 | */ | |
1006 | ||
1007 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1008 | { | |
e041c683 | 1009 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 LT |
1010 | } |
1011 | ||
1012 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1013 | { | |
e041c683 | 1014 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 LT |
1015 | } |
1016 | ||
1017 | /* Rename ifa_labels for a device name change. Make some effort to preserve existing | |
1018 | * alias numbering and to create unique labels if possible. | |
1019 | */ | |
1020 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1021 | { |
1da177e4 LT |
1022 | struct in_ifaddr *ifa; |
1023 | int named = 0; | |
1024 | ||
e905a9ed YH |
1025 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1026 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1027 | |
1028 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1029 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 LT |
1030 | if (named++ == 0) |
1031 | continue; | |
44344b2a | 1032 | dot = strchr(old, ':'); |
e905a9ed YH |
1033 | if (dot == NULL) { |
1034 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1035 | dot = old; |
1036 | } | |
e905a9ed YH |
1037 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { |
1038 | strcat(ifa->ifa_label, dot); | |
1039 | } else { | |
1040 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
1041 | } | |
1042 | } | |
1043 | } | |
1da177e4 LT |
1044 | |
1045 | /* Called only under RTNL semaphore */ | |
1046 | ||
1047 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1048 | void *ptr) | |
1049 | { | |
1050 | struct net_device *dev = ptr; | |
e5ed6399 | 1051 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 | 1052 | |
e9dc8653 EB |
1053 | if (dev->nd_net != &init_net) |
1054 | return NOTIFY_DONE; | |
1055 | ||
1da177e4 LT |
1056 | ASSERT_RTNL(); |
1057 | ||
1058 | if (!in_dev) { | |
8030f544 | 1059 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1060 | in_dev = inetdev_init(dev); |
b217d616 HX |
1061 | if (!in_dev) |
1062 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1063 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1064 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1065 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1066 | } |
1da177e4 LT |
1067 | } |
1068 | goto out; | |
1069 | } | |
1070 | ||
1071 | switch (event) { | |
1072 | case NETDEV_REGISTER: | |
1073 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1074 | dev->ip_ptr = NULL; | |
1075 | break; | |
1076 | case NETDEV_UP: | |
1077 | if (dev->mtu < 68) | |
1078 | break; | |
0cc217e1 | 1079 | if (dev->flags & IFF_LOOPBACK) { |
1da177e4 LT |
1080 | struct in_ifaddr *ifa; |
1081 | if ((ifa = inet_alloc_ifa()) != NULL) { | |
1082 | ifa->ifa_local = | |
1083 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1084 | ifa->ifa_prefixlen = 8; | |
1085 | ifa->ifa_mask = inet_make_mask(8); | |
1086 | in_dev_hold(in_dev); | |
1087 | ifa->ifa_dev = in_dev; | |
1088 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1089 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1090 | inet_insert_ifa(ifa); | |
1091 | } | |
1092 | } | |
1093 | ip_mc_up(in_dev); | |
1094 | break; | |
1095 | case NETDEV_DOWN: | |
1096 | ip_mc_down(in_dev); | |
1097 | break; | |
1098 | case NETDEV_CHANGEMTU: | |
1099 | if (dev->mtu >= 68) | |
1100 | break; | |
1101 | /* MTU falled under 68, disable IP */ | |
1102 | case NETDEV_UNREGISTER: | |
1103 | inetdev_destroy(in_dev); | |
1104 | break; | |
1105 | case NETDEV_CHANGENAME: | |
1106 | /* Do not notify about label change, this event is | |
1107 | * not interesting to applications using netlink. | |
1108 | */ | |
1109 | inetdev_changename(dev, in_dev); | |
1110 | ||
51602b2a | 1111 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1112 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1113 | break; |
1114 | } | |
1115 | out: | |
1116 | return NOTIFY_DONE; | |
1117 | } | |
1118 | ||
1119 | static struct notifier_block ip_netdev_notifier = { | |
1120 | .notifier_call =inetdev_event, | |
1121 | }; | |
1122 | ||
339bf98f TG |
1123 | static inline size_t inet_nlmsg_size(void) |
1124 | { | |
1125 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1126 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1127 | + nla_total_size(4) /* IFA_LOCAL */ | |
1128 | + nla_total_size(4) /* IFA_BROADCAST */ | |
1129 | + nla_total_size(4) /* IFA_ANYCAST */ | |
1130 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ | |
1131 | } | |
1132 | ||
1da177e4 | 1133 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1134 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1135 | { |
1136 | struct ifaddrmsg *ifm; | |
1137 | struct nlmsghdr *nlh; | |
1da177e4 | 1138 | |
47f68512 TG |
1139 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1140 | if (nlh == NULL) | |
26932566 | 1141 | return -EMSGSIZE; |
47f68512 TG |
1142 | |
1143 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1144 | ifm->ifa_family = AF_INET; |
1145 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1146 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1147 | ifm->ifa_scope = ifa->ifa_scope; | |
1148 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1149 | |
1da177e4 | 1150 | if (ifa->ifa_address) |
a7a628c4 | 1151 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1152 | |
1da177e4 | 1153 | if (ifa->ifa_local) |
a7a628c4 | 1154 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1155 | |
1da177e4 | 1156 | if (ifa->ifa_broadcast) |
a7a628c4 | 1157 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1158 | |
1da177e4 | 1159 | if (ifa->ifa_anycast) |
a7a628c4 | 1160 | NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast); |
47f68512 | 1161 | |
1da177e4 | 1162 | if (ifa->ifa_label[0]) |
47f68512 | 1163 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1164 | |
47f68512 TG |
1165 | return nlmsg_end(skb, nlh); |
1166 | ||
1167 | nla_put_failure: | |
26932566 PM |
1168 | nlmsg_cancel(skb, nlh); |
1169 | return -EMSGSIZE; | |
1da177e4 LT |
1170 | } |
1171 | ||
1172 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1173 | { | |
b854272b | 1174 | struct net *net = skb->sk->sk_net; |
1da177e4 LT |
1175 | int idx, ip_idx; |
1176 | struct net_device *dev; | |
1177 | struct in_device *in_dev; | |
1178 | struct in_ifaddr *ifa; | |
1179 | int s_ip_idx, s_idx = cb->args[0]; | |
1180 | ||
b854272b DL |
1181 | if (net != &init_net) |
1182 | return 0; | |
1183 | ||
1da177e4 | 1184 | s_ip_idx = ip_idx = cb->args[1]; |
7562f876 | 1185 | idx = 0; |
881d966b | 1186 | for_each_netdev(&init_net, dev) { |
1da177e4 | 1187 | if (idx < s_idx) |
7562f876 | 1188 | goto cont; |
1da177e4 LT |
1189 | if (idx > s_idx) |
1190 | s_ip_idx = 0; | |
6313c1e0 | 1191 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
7562f876 | 1192 | goto cont; |
1da177e4 LT |
1193 | |
1194 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1195 | ifa = ifa->ifa_next, ip_idx++) { | |
1196 | if (ip_idx < s_ip_idx) | |
596e4150 | 1197 | continue; |
1da177e4 LT |
1198 | if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, |
1199 | cb->nlh->nlmsg_seq, | |
6313c1e0 | 1200 | RTM_NEWADDR, NLM_F_MULTI) <= 0) |
1da177e4 | 1201 | goto done; |
1da177e4 | 1202 | } |
7562f876 PE |
1203 | cont: |
1204 | idx++; | |
1da177e4 LT |
1205 | } |
1206 | ||
1207 | done: | |
1da177e4 LT |
1208 | cb->args[0] = idx; |
1209 | cb->args[1] = ip_idx; | |
1210 | ||
1211 | return skb->len; | |
1212 | } | |
1213 | ||
d6062cbb TG |
1214 | static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh, |
1215 | u32 pid) | |
1da177e4 | 1216 | { |
47f68512 | 1217 | struct sk_buff *skb; |
d6062cbb TG |
1218 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1219 | int err = -ENOBUFS; | |
1da177e4 | 1220 | |
339bf98f | 1221 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1222 | if (skb == NULL) |
d6062cbb TG |
1223 | goto errout; |
1224 | ||
1225 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1226 | if (err < 0) { |
1227 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1228 | WARN_ON(err == -EMSGSIZE); | |
1229 | kfree_skb(skb); | |
1230 | goto errout; | |
1231 | } | |
97c53cac | 1232 | err = rtnl_notify(skb, &init_net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
d6062cbb TG |
1233 | errout: |
1234 | if (err < 0) | |
97c53cac | 1235 | rtnl_set_sk_err(&init_net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1236 | } |
1237 | ||
1da177e4 LT |
1238 | #ifdef CONFIG_SYSCTL |
1239 | ||
c0ce9fb3 | 1240 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1241 | { |
1242 | struct net_device *dev; | |
1243 | ||
1244 | read_lock(&dev_base_lock); | |
c0ce9fb3 | 1245 | for_each_netdev(net, dev) { |
31be3085 HX |
1246 | struct in_device *in_dev; |
1247 | rcu_read_lock(); | |
1248 | in_dev = __in_dev_get_rcu(dev); | |
1249 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
1250 | in_dev->cnf.data[i] = ipv4_devconf_dflt.data[i]; | |
1251 | rcu_read_unlock(); | |
1252 | } | |
1253 | read_unlock(&dev_base_lock); | |
1254 | } | |
1255 | ||
c0ce9fb3 | 1256 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1257 | { |
1258 | struct net_device *dev; | |
1259 | int on = IPV4_DEVCONF_ALL(FORWARDING); | |
1260 | ||
1261 | IPV4_DEVCONF_ALL(ACCEPT_REDIRECTS) = !on; | |
1262 | IPV4_DEVCONF_DFLT(FORWARDING) = on; | |
1263 | ||
1264 | read_lock(&dev_base_lock); | |
c0ce9fb3 | 1265 | for_each_netdev(net, dev) { |
68dd299b PE |
1266 | struct in_device *in_dev; |
1267 | rcu_read_lock(); | |
1268 | in_dev = __in_dev_get_rcu(dev); | |
1269 | if (in_dev) | |
1270 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1271 | rcu_read_unlock(); | |
1272 | } | |
1273 | read_unlock(&dev_base_lock); | |
1274 | ||
1275 | rt_cache_flush(0); | |
1276 | } | |
1277 | ||
31be3085 HX |
1278 | static int devinet_conf_proc(ctl_table *ctl, int write, |
1279 | struct file* filp, void __user *buffer, | |
1280 | size_t *lenp, loff_t *ppos) | |
1281 | { | |
1282 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1283 | ||
1284 | if (write) { | |
1285 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1286 | struct net *net = ctl->extra2; |
31be3085 HX |
1287 | int i = (int *)ctl->data - cnf->data; |
1288 | ||
1289 | set_bit(i, cnf->state); | |
1290 | ||
1291 | if (cnf == &ipv4_devconf_dflt) | |
c0ce9fb3 | 1292 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1293 | } |
1294 | ||
1295 | return ret; | |
1296 | } | |
1297 | ||
1298 | static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen, | |
1299 | void __user *oldval, size_t __user *oldlenp, | |
1300 | void __user *newval, size_t newlen) | |
1301 | { | |
1302 | struct ipv4_devconf *cnf; | |
c0ce9fb3 | 1303 | struct net *net; |
31be3085 HX |
1304 | int *valp = table->data; |
1305 | int new; | |
1306 | int i; | |
1307 | ||
1308 | if (!newval || !newlen) | |
1309 | return 0; | |
1310 | ||
1311 | if (newlen != sizeof(int)) | |
1312 | return -EINVAL; | |
1313 | ||
1314 | if (get_user(new, (int __user *)newval)) | |
1315 | return -EFAULT; | |
1316 | ||
1317 | if (new == *valp) | |
1318 | return 0; | |
1319 | ||
1320 | if (oldval && oldlenp) { | |
1321 | size_t len; | |
1322 | ||
1323 | if (get_user(len, oldlenp)) | |
1324 | return -EFAULT; | |
1325 | ||
1326 | if (len) { | |
1327 | if (len > table->maxlen) | |
1328 | len = table->maxlen; | |
1329 | if (copy_to_user(oldval, valp, len)) | |
1330 | return -EFAULT; | |
1331 | if (put_user(len, oldlenp)) | |
1332 | return -EFAULT; | |
1333 | } | |
1334 | } | |
1335 | ||
1336 | *valp = new; | |
1337 | ||
1338 | cnf = table->extra1; | |
c0ce9fb3 | 1339 | net = table->extra2; |
31be3085 HX |
1340 | i = (int *)table->data - cnf->data; |
1341 | ||
1342 | set_bit(i, cnf->state); | |
1343 | ||
1344 | if (cnf == &ipv4_devconf_dflt) | |
c0ce9fb3 | 1345 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1346 | |
1347 | return 1; | |
1348 | } | |
1349 | ||
1da177e4 LT |
1350 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
1351 | struct file* filp, void __user *buffer, | |
1352 | size_t *lenp, loff_t *ppos) | |
1353 | { | |
1354 | int *valp = ctl->data; | |
1355 | int val = *valp; | |
1356 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1357 | ||
1358 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1359 | struct net *net = ctl->extra2; |
1360 | ||
42f811b8 | 1361 | if (valp == &IPV4_DEVCONF_ALL(FORWARDING)) |
c0ce9fb3 | 1362 | inet_forward_change(net); |
42f811b8 | 1363 | else if (valp != &IPV4_DEVCONF_DFLT(FORWARDING)) |
1da177e4 LT |
1364 | rt_cache_flush(0); |
1365 | } | |
1366 | ||
1367 | return ret; | |
1368 | } | |
1369 | ||
1370 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
1371 | struct file* filp, void __user *buffer, | |
1372 | size_t *lenp, loff_t *ppos) | |
1373 | { | |
1374 | int *valp = ctl->data; | |
1375 | int val = *valp; | |
1376 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1377 | ||
1378 | if (write && *valp != val) | |
1379 | rt_cache_flush(0); | |
1380 | ||
1381 | return ret; | |
1382 | } | |
1383 | ||
1384 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
1385 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 1386 | void __user *newval, size_t newlen) |
1da177e4 | 1387 | { |
31be3085 HX |
1388 | int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp, |
1389 | newval, newlen); | |
1da177e4 | 1390 | |
31be3085 HX |
1391 | if (ret == 1) |
1392 | rt_cache_flush(0); | |
1da177e4 | 1393 | |
31be3085 | 1394 | return ret; |
1da177e4 LT |
1395 | } |
1396 | ||
1397 | ||
42f811b8 HX |
1398 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \ |
1399 | { \ | |
1400 | .ctl_name = NET_IPV4_CONF_ ## attr, \ | |
1401 | .procname = name, \ | |
1402 | .data = ipv4_devconf.data + \ | |
1403 | NET_IPV4_CONF_ ## attr - 1, \ | |
1404 | .maxlen = sizeof(int), \ | |
1405 | .mode = mval, \ | |
1406 | .proc_handler = proc, \ | |
1407 | .strategy = sysctl, \ | |
31be3085 | 1408 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1409 | } |
1410 | ||
1411 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
31be3085 HX |
1412 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \ |
1413 | devinet_conf_sysctl) | |
42f811b8 HX |
1414 | |
1415 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
31be3085 HX |
1416 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \ |
1417 | devinet_conf_sysctl) | |
42f811b8 HX |
1418 | |
1419 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \ | |
1420 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl) | |
1421 | ||
1422 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
1423 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \ | |
1424 | ipv4_doint_and_flush_strategy) | |
1425 | ||
1da177e4 LT |
1426 | static struct devinet_sysctl_table { |
1427 | struct ctl_table_header *sysctl_header; | |
bfada697 PE |
1428 | struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; |
1429 | char *dev_name; | |
1da177e4 LT |
1430 | } devinet_sysctl = { |
1431 | .devinet_vars = { | |
42f811b8 | 1432 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
31be3085 HX |
1433 | devinet_sysctl_forward, |
1434 | devinet_conf_sysctl), | |
42f811b8 HX |
1435 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1436 | ||
1437 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1438 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1439 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1440 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1441 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1442 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1443 | "accept_source_route"), | |
1444 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), | |
1445 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1446 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1447 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1448 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1449 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1450 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1451 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1452 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
1453 | ||
1454 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1455 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1456 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1457 | "force_igmp_version"), | |
1458 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1459 | "promote_secondaries"), | |
1da177e4 | 1460 | }, |
1da177e4 LT |
1461 | }; |
1462 | ||
ea40b324 PE |
1463 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
1464 | int ctl_name, struct ipv4_devconf *p) | |
1da177e4 LT |
1465 | { |
1466 | int i; | |
9fa89642 | 1467 | struct devinet_sysctl_table *t; |
1da177e4 | 1468 | |
bfada697 PE |
1469 | #define DEVINET_CTL_PATH_DEV 3 |
1470 | ||
1471 | struct ctl_path devinet_ctl_path[] = { | |
1472 | { .procname = "net", .ctl_name = CTL_NET, }, | |
1473 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1474 | { .procname = "conf", .ctl_name = NET_IPV4_CONF, }, | |
1475 | { /* to be set */ }, | |
1476 | { }, | |
1477 | }; | |
1478 | ||
9fa89642 | 1479 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1480 | if (!t) |
9fa89642 PE |
1481 | goto out; |
1482 | ||
1da177e4 LT |
1483 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1484 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1485 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1486 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1487 | } |
1488 | ||
e905a9ed YH |
1489 | /* |
1490 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1491 | * by sysctl and we wouldn't want anyone to change it under our feet |
1492 | * (see SIOCSIFNAME). | |
e905a9ed | 1493 | */ |
bfada697 PE |
1494 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1495 | if (!t->dev_name) | |
9fa89642 | 1496 | goto free; |
1da177e4 | 1497 | |
bfada697 PE |
1498 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1499 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name; | |
1da177e4 | 1500 | |
752d14dc | 1501 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, |
bfada697 | 1502 | t->devinet_vars); |
1da177e4 | 1503 | if (!t->sysctl_header) |
9fa89642 | 1504 | goto free_procname; |
1da177e4 LT |
1505 | |
1506 | p->sysctl = t; | |
ea40b324 | 1507 | return 0; |
1da177e4 | 1508 | |
9fa89642 | 1509 | free_procname: |
bfada697 | 1510 | kfree(t->dev_name); |
9fa89642 | 1511 | free: |
1da177e4 | 1512 | kfree(t); |
9fa89642 | 1513 | out: |
ea40b324 | 1514 | return -ENOBUFS; |
1da177e4 LT |
1515 | } |
1516 | ||
51602b2a PE |
1517 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1518 | { | |
1519 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1520 | ||
1521 | if (t == NULL) | |
1522 | return; | |
1523 | ||
1524 | cnf->sysctl = NULL; | |
1525 | unregister_sysctl_table(t->sysctl_header); | |
1526 | kfree(t->dev_name); | |
1527 | kfree(t); | |
1528 | } | |
1529 | ||
66f27a52 PE |
1530 | static void devinet_sysctl_register(struct in_device *idev) |
1531 | { | |
51602b2a PE |
1532 | neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4, |
1533 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
c0ce9fb3 PE |
1534 | __devinet_sysctl_register(idev->dev->nd_net, idev->dev->name, |
1535 | idev->dev->ifindex, &idev->cnf); | |
66f27a52 PE |
1536 | } |
1537 | ||
51602b2a | 1538 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1539 | { |
51602b2a PE |
1540 | __devinet_sysctl_unregister(&idev->cnf); |
1541 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 LT |
1542 | } |
1543 | #endif | |
1544 | ||
68dd299b PE |
1545 | static struct ctl_table ctl_forward_entry[] = { |
1546 | { | |
1547 | .ctl_name = NET_IPV4_FORWARD, | |
1548 | .procname = "ip_forward", | |
1549 | .data = &ipv4_devconf.data[ | |
1550 | NET_IPV4_CONF_FORWARDING - 1], | |
1551 | .maxlen = sizeof(int), | |
1552 | .mode = 0644, | |
1553 | .proc_handler = devinet_sysctl_forward, | |
1554 | .strategy = devinet_conf_sysctl, | |
1555 | .extra1 = &ipv4_devconf, | |
c0ce9fb3 | 1556 | .extra2 = &init_net, |
68dd299b PE |
1557 | }, |
1558 | { }, | |
1559 | }; | |
1560 | ||
752d14dc | 1561 | static __net_initdata struct ctl_path net_ipv4_path[] = { |
68dd299b PE |
1562 | { .procname = "net", .ctl_name = CTL_NET, }, |
1563 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1564 | { }, | |
1565 | }; | |
1566 | ||
752d14dc PE |
1567 | static __net_init int devinet_init_net(struct net *net) |
1568 | { | |
1569 | int err; | |
1570 | struct ctl_table *tbl; | |
1571 | struct ipv4_devconf *all, *dflt; | |
1572 | struct ctl_table_header *forw_hdr; | |
1573 | ||
1574 | err = -ENOMEM; | |
1575 | all = &ipv4_devconf; | |
1576 | dflt = &ipv4_devconf_dflt; | |
1577 | tbl = ctl_forward_entry; | |
1578 | ||
1579 | if (net != &init_net) { | |
1580 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); | |
1581 | if (all == NULL) | |
1582 | goto err_alloc_all; | |
1583 | ||
1584 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1585 | if (dflt == NULL) | |
1586 | goto err_alloc_dflt; | |
1587 | ||
1588 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); | |
1589 | if (tbl == NULL) | |
1590 | goto err_alloc_ctl; | |
1591 | ||
1592 | tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1]; | |
1593 | tbl[0].extra1 = all; | |
1594 | tbl[0].extra2 = net; | |
1595 | } | |
1596 | ||
1597 | #ifdef CONFIG_SYSCTL | |
1598 | err = __devinet_sysctl_register(net, "all", | |
1599 | NET_PROTO_CONF_ALL, all); | |
1600 | if (err < 0) | |
1601 | goto err_reg_all; | |
1602 | ||
1603 | err = __devinet_sysctl_register(net, "default", | |
1604 | NET_PROTO_CONF_DEFAULT, dflt); | |
1605 | if (err < 0) | |
1606 | goto err_reg_dflt; | |
1607 | ||
1608 | err = -ENOMEM; | |
1609 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1610 | if (forw_hdr == NULL) | |
1611 | goto err_reg_ctl; | |
1612 | #endif | |
1613 | ||
1614 | net->ipv4.forw_hdr = forw_hdr; | |
1615 | net->ipv4.devconf_all = all; | |
1616 | net->ipv4.devconf_dflt = dflt; | |
1617 | return 0; | |
1618 | ||
1619 | #ifdef CONFIG_SYSCTL | |
1620 | err_reg_ctl: | |
1621 | __devinet_sysctl_unregister(dflt); | |
1622 | err_reg_dflt: | |
1623 | __devinet_sysctl_unregister(all); | |
1624 | err_reg_all: | |
1625 | if (tbl != ctl_forward_entry) | |
1626 | kfree(tbl); | |
1627 | #endif | |
1628 | err_alloc_ctl: | |
1629 | if (dflt != &ipv4_devconf_dflt) | |
1630 | kfree(dflt); | |
1631 | err_alloc_dflt: | |
1632 | if (all != &ipv4_devconf) | |
1633 | kfree(all); | |
1634 | err_alloc_all: | |
1635 | return err; | |
1636 | } | |
1637 | ||
1638 | static __net_exit void devinet_exit_net(struct net *net) | |
1639 | { | |
1640 | struct ctl_table *tbl; | |
1641 | ||
1642 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
1643 | #ifdef CONFIG_SYSCTL | |
1644 | unregister_net_sysctl_table(net->ipv4.forw_hdr); | |
1645 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1646 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
1647 | #endif | |
1648 | kfree(tbl); | |
1649 | kfree(net->ipv4.devconf_dflt); | |
1650 | kfree(net->ipv4.devconf_all); | |
1651 | } | |
1652 | ||
1653 | static __net_initdata struct pernet_operations devinet_ops = { | |
1654 | .init = devinet_init_net, | |
1655 | .exit = devinet_exit_net, | |
1656 | }; | |
1657 | ||
1da177e4 LT |
1658 | void __init devinet_init(void) |
1659 | { | |
752d14dc PE |
1660 | register_pernet_subsys(&devinet_ops); |
1661 | ||
1da177e4 LT |
1662 | register_gifconf(PF_INET, inet_gifconf); |
1663 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f TG |
1664 | |
1665 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1666 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1667 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 LT |
1668 | } |
1669 | ||
1da177e4 LT |
1670 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1671 | EXPORT_SYMBOL(inet_select_addr); | |
1672 | EXPORT_SYMBOL(inetdev_by_index); | |
1673 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
1674 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |