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