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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 | 66 | |
0027ba84 | 67 | static 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 | ||
9355bbd6 PE |
86 | #define IPV4_DEVCONF_DFLT(net, attr) \ |
87 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
42f811b8 | 88 | |
ef7c79ed | 89 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
90 | [IFA_LOCAL] = { .type = NLA_U32 }, |
91 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
92 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
93 | [IFA_ANYCAST] = { .type = NLA_U32 }, | |
5176f91e | 94 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c753978 TG |
95 | }; |
96 | ||
d6062cbb | 97 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 98 | |
e041c683 | 99 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
100 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
101 | int destroy); | |
102 | #ifdef CONFIG_SYSCTL | |
66f27a52 | 103 | static void devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
104 | static void devinet_sysctl_unregister(struct in_device *idev); |
105 | #else | |
106 | static inline void devinet_sysctl_register(struct in_device *idev) | |
107 | { | |
108 | } | |
109 | static inline void devinet_sysctl_unregister(struct in_device *idev) | |
110 | { | |
111 | } | |
1da177e4 LT |
112 | #endif |
113 | ||
114 | /* Locks all the inet devices. */ | |
115 | ||
116 | static struct in_ifaddr *inet_alloc_ifa(void) | |
117 | { | |
0da974f4 | 118 | struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); |
1da177e4 LT |
119 | |
120 | if (ifa) { | |
1da177e4 LT |
121 | INIT_RCU_HEAD(&ifa->rcu_head); |
122 | } | |
123 | ||
124 | return ifa; | |
125 | } | |
126 | ||
127 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
128 | { | |
129 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
130 | if (ifa->ifa_dev) | |
131 | in_dev_put(ifa->ifa_dev); | |
132 | kfree(ifa); | |
133 | } | |
134 | ||
135 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
136 | { | |
137 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
138 | } | |
139 | ||
140 | void in_dev_finish_destroy(struct in_device *idev) | |
141 | { | |
142 | struct net_device *dev = idev->dev; | |
143 | ||
144 | BUG_TRAP(!idev->ifa_list); | |
145 | BUG_TRAP(!idev->mc_list); | |
146 | #ifdef NET_REFCNT_DEBUG | |
147 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
148 | idev, dev ? dev->name : "NIL"); | |
149 | #endif | |
150 | dev_put(dev); | |
151 | if (!idev->dead) | |
152 | printk("Freeing alive in_device %p\n", idev); | |
153 | else { | |
154 | kfree(idev); | |
155 | } | |
156 | } | |
157 | ||
71e27da9 | 158 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
159 | { |
160 | struct in_device *in_dev; | |
161 | ||
162 | ASSERT_RTNL(); | |
163 | ||
0da974f4 | 164 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
165 | if (!in_dev) |
166 | goto out; | |
1da177e4 | 167 | INIT_RCU_HEAD(&in_dev->rcu_head); |
9355bbd6 PE |
168 | memcpy(&in_dev->cnf, dev->nd_net->ipv4.devconf_dflt, |
169 | sizeof(in_dev->cnf)); | |
1da177e4 LT |
170 | in_dev->cnf.sysctl = NULL; |
171 | in_dev->dev = dev; | |
172 | if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) | |
173 | goto out_kfree; | |
174 | /* Reference in_dev->dev */ | |
175 | dev_hold(dev); | |
30c4cf57 | 176 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 177 | in_dev_hold(in_dev); |
1da177e4 | 178 | |
66f27a52 | 179 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
180 | ip_mc_init_dev(in_dev); |
181 | if (dev->flags & IFF_UP) | |
182 | ip_mc_up(in_dev); | |
483479ec | 183 | |
30c4cf57 DS |
184 | /* we can receive as soon as ip_ptr is set -- do this last */ |
185 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 186 | out: |
1da177e4 LT |
187 | return in_dev; |
188 | out_kfree: | |
189 | kfree(in_dev); | |
190 | in_dev = NULL; | |
191 | goto out; | |
192 | } | |
193 | ||
194 | static void in_dev_rcu_put(struct rcu_head *head) | |
195 | { | |
196 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
197 | in_dev_put(idev); | |
198 | } | |
199 | ||
200 | static void inetdev_destroy(struct in_device *in_dev) | |
201 | { | |
202 | struct in_ifaddr *ifa; | |
203 | struct net_device *dev; | |
204 | ||
205 | ASSERT_RTNL(); | |
206 | ||
207 | dev = in_dev->dev; | |
1da177e4 LT |
208 | |
209 | in_dev->dead = 1; | |
210 | ||
211 | ip_mc_destroy_dev(in_dev); | |
212 | ||
213 | while ((ifa = in_dev->ifa_list) != NULL) { | |
214 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
215 | inet_free_ifa(ifa); | |
216 | } | |
217 | ||
1da177e4 LT |
218 | dev->ip_ptr = NULL; |
219 | ||
51602b2a | 220 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
221 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
222 | arp_ifdown(dev); | |
223 | ||
224 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
225 | } | |
226 | ||
ff428d72 | 227 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
228 | { |
229 | rcu_read_lock(); | |
230 | for_primary_ifa(in_dev) { | |
231 | if (inet_ifa_match(a, ifa)) { | |
232 | if (!b || inet_ifa_match(b, ifa)) { | |
233 | rcu_read_unlock(); | |
234 | return 1; | |
235 | } | |
236 | } | |
237 | } endfor_ifa(in_dev); | |
238 | rcu_read_unlock(); | |
239 | return 0; | |
240 | } | |
241 | ||
d6062cbb TG |
242 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
243 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 244 | { |
8f937c60 | 245 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
246 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
247 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
248 | struct in_ifaddr *prev_prom = NULL; | |
249 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
250 | |
251 | ASSERT_RTNL(); | |
252 | ||
e905a9ed | 253 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
254 | * unless alias promotion is set |
255 | **/ | |
1da177e4 LT |
256 | |
257 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
258 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
259 | ||
260 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 261 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
262 | ifa1->ifa_scope <= ifa->ifa_scope) |
263 | last_prim = ifa; | |
264 | ||
1da177e4 LT |
265 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
266 | ifa1->ifa_mask != ifa->ifa_mask || | |
267 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
268 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 269 | prev_prom = ifa; |
1da177e4 LT |
270 | continue; |
271 | } | |
272 | ||
0ff60a45 | 273 | if (!do_promote) { |
8f937c60 | 274 | *ifap1 = ifa->ifa_next; |
1da177e4 | 275 | |
d6062cbb | 276 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
277 | blocking_notifier_call_chain(&inetaddr_chain, |
278 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
279 | inet_free_ifa(ifa); |
280 | } else { | |
281 | promote = ifa; | |
282 | break; | |
283 | } | |
1da177e4 LT |
284 | } |
285 | } | |
286 | ||
287 | /* 2. Unlink it */ | |
288 | ||
289 | *ifap = ifa1->ifa_next; | |
290 | ||
291 | /* 3. Announce address deletion */ | |
292 | ||
293 | /* Send message first, then call notifier. | |
294 | At first sight, FIB update triggered by notifier | |
295 | will refer to already deleted ifaddr, that could confuse | |
296 | netlink listeners. It is not true: look, gated sees | |
297 | that route deleted and if it still thinks that ifaddr | |
298 | is valid, it will try to restore deleted routes... Grr. | |
299 | So that, this order is correct. | |
300 | */ | |
d6062cbb | 301 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 302 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 303 | |
0ff60a45 JHS |
304 | if (promote) { |
305 | ||
306 | if (prev_prom) { | |
307 | prev_prom->ifa_next = promote->ifa_next; | |
308 | promote->ifa_next = last_prim->ifa_next; | |
309 | last_prim->ifa_next = promote; | |
310 | } | |
8f937c60 | 311 | |
8f937c60 | 312 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 313 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
314 | blocking_notifier_call_chain(&inetaddr_chain, |
315 | NETDEV_UP, promote); | |
0ff60a45 JHS |
316 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
317 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
318 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
319 | continue; | |
320 | fib_add_ifaddr(ifa); | |
321 | } | |
322 | ||
323 | } | |
6363097c | 324 | if (destroy) |
0ff60a45 | 325 | inet_free_ifa(ifa1); |
1da177e4 LT |
326 | } |
327 | ||
d6062cbb TG |
328 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
329 | int destroy) | |
330 | { | |
331 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
332 | } | |
333 | ||
334 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
335 | u32 pid) | |
1da177e4 LT |
336 | { |
337 | struct in_device *in_dev = ifa->ifa_dev; | |
338 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
339 | ||
340 | ASSERT_RTNL(); | |
341 | ||
342 | if (!ifa->ifa_local) { | |
343 | inet_free_ifa(ifa); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
348 | last_primary = &in_dev->ifa_list; | |
349 | ||
350 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
351 | ifap = &ifa1->ifa_next) { | |
352 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
353 | ifa->ifa_scope <= ifa1->ifa_scope) | |
354 | last_primary = &ifa1->ifa_next; | |
355 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
356 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
357 | if (ifa1->ifa_local == ifa->ifa_local) { | |
358 | inet_free_ifa(ifa); | |
359 | return -EEXIST; | |
360 | } | |
361 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
362 | inet_free_ifa(ifa); | |
363 | return -EINVAL; | |
364 | } | |
365 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
366 | } | |
367 | } | |
368 | ||
369 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
370 | net_srandom(ifa->ifa_local); | |
371 | ifap = last_primary; | |
372 | } | |
373 | ||
374 | ifa->ifa_next = *ifap; | |
375 | *ifap = ifa; | |
376 | ||
377 | /* Send message first, then call notifier. | |
378 | Notifier will trigger FIB update, so that | |
379 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 380 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 381 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
382 | |
383 | return 0; | |
384 | } | |
385 | ||
d6062cbb TG |
386 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
387 | { | |
388 | return __inet_insert_ifa(ifa, NULL, 0); | |
389 | } | |
390 | ||
1da177e4 LT |
391 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
392 | { | |
e5ed6399 | 393 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
394 | |
395 | ASSERT_RTNL(); | |
396 | ||
397 | if (!in_dev) { | |
71e27da9 HX |
398 | inet_free_ifa(ifa); |
399 | return -ENOBUFS; | |
1da177e4 | 400 | } |
71e27da9 | 401 | ipv4_devconf_setall(in_dev); |
1da177e4 LT |
402 | if (ifa->ifa_dev != in_dev) { |
403 | BUG_TRAP(!ifa->ifa_dev); | |
404 | in_dev_hold(in_dev); | |
405 | ifa->ifa_dev = in_dev; | |
406 | } | |
f97c1e0c | 407 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
408 | ifa->ifa_scope = RT_SCOPE_HOST; |
409 | return inet_insert_ifa(ifa); | |
410 | } | |
411 | ||
7fee0ca2 | 412 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
413 | { |
414 | struct net_device *dev; | |
415 | struct in_device *in_dev = NULL; | |
416 | read_lock(&dev_base_lock); | |
7fee0ca2 | 417 | dev = __dev_get_by_index(net, ifindex); |
1da177e4 LT |
418 | if (dev) |
419 | in_dev = in_dev_get(dev); | |
420 | read_unlock(&dev_base_lock); | |
421 | return in_dev; | |
422 | } | |
423 | ||
424 | /* Called only from RTNL semaphored context. No locks. */ | |
425 | ||
60cad5da AV |
426 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
427 | __be32 mask) | |
1da177e4 LT |
428 | { |
429 | ASSERT_RTNL(); | |
430 | ||
431 | for_primary_ifa(in_dev) { | |
432 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
433 | return ifa; | |
434 | } endfor_ifa(in_dev); | |
435 | return NULL; | |
436 | } | |
437 | ||
438 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
439 | { | |
b854272b | 440 | struct net *net = skb->sk->sk_net; |
dfdd5fd4 | 441 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 442 | struct in_device *in_dev; |
dfdd5fd4 | 443 | struct ifaddrmsg *ifm; |
1da177e4 | 444 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 445 | int err = -EINVAL; |
1da177e4 LT |
446 | |
447 | ASSERT_RTNL(); | |
448 | ||
dfdd5fd4 TG |
449 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
450 | if (err < 0) | |
451 | goto errout; | |
452 | ||
453 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 454 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
dfdd5fd4 TG |
455 | if (in_dev == NULL) { |
456 | err = -ENODEV; | |
457 | goto errout; | |
458 | } | |
459 | ||
1da177e4 LT |
460 | __in_dev_put(in_dev); |
461 | ||
462 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
463 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 464 | if (tb[IFA_LOCAL] && |
a7a628c4 | 465 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
466 | continue; |
467 | ||
468 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 469 | continue; |
dfdd5fd4 TG |
470 | |
471 | if (tb[IFA_ADDRESS] && | |
472 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 473 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
474 | continue; |
475 | ||
d6062cbb | 476 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
477 | return 0; |
478 | } | |
dfdd5fd4 TG |
479 | |
480 | err = -EADDRNOTAVAIL; | |
481 | errout: | |
482 | return err; | |
1da177e4 LT |
483 | } |
484 | ||
4b8aa9ab | 485 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) |
1da177e4 | 486 | { |
5c753978 TG |
487 | struct nlattr *tb[IFA_MAX+1]; |
488 | struct in_ifaddr *ifa; | |
489 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
490 | struct net_device *dev; |
491 | struct in_device *in_dev; | |
7b218574 | 492 | int err; |
1da177e4 | 493 | |
5c753978 TG |
494 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
495 | if (err < 0) | |
496 | goto errout; | |
1da177e4 | 497 | |
5c753978 | 498 | ifm = nlmsg_data(nlh); |
7b218574 DL |
499 | err = -EINVAL; |
500 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
5c753978 | 501 | goto errout; |
1da177e4 | 502 | |
4b8aa9ab | 503 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 DL |
504 | err = -ENODEV; |
505 | if (dev == NULL) | |
5c753978 | 506 | goto errout; |
1da177e4 | 507 | |
5c753978 | 508 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 DL |
509 | err = -ENOBUFS; |
510 | if (in_dev == NULL) | |
71e27da9 | 511 | goto errout; |
1da177e4 | 512 | |
5c753978 | 513 | ifa = inet_alloc_ifa(); |
7b218574 | 514 | if (ifa == NULL) |
5c753978 TG |
515 | /* |
516 | * A potential indev allocation can be left alive, it stays | |
517 | * assigned to its device and is destroy with it. | |
518 | */ | |
5c753978 | 519 | goto errout; |
5c753978 | 520 | |
a4e65d36 | 521 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
522 | in_dev_hold(in_dev); |
523 | ||
524 | if (tb[IFA_ADDRESS] == NULL) | |
525 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 526 | |
1da177e4 LT |
527 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
528 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
529 | ifa->ifa_flags = ifm->ifa_flags; |
530 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
531 | ifa->ifa_dev = in_dev; |
532 | ||
a7a628c4 AV |
533 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
534 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
535 | |
536 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 537 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 TG |
538 | |
539 | if (tb[IFA_ANYCAST]) | |
a7a628c4 | 540 | ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]); |
5c753978 TG |
541 | |
542 | if (tb[IFA_LABEL]) | |
543 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
544 | else |
545 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
546 | ||
5c753978 TG |
547 | return ifa; |
548 | ||
549 | errout: | |
550 | return ERR_PTR(err); | |
551 | } | |
552 | ||
553 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
554 | { | |
b854272b | 555 | struct net *net = skb->sk->sk_net; |
5c753978 TG |
556 | struct in_ifaddr *ifa; |
557 | ||
558 | ASSERT_RTNL(); | |
559 | ||
4b8aa9ab | 560 | ifa = rtm_to_ifaddr(net, nlh); |
5c753978 TG |
561 | if (IS_ERR(ifa)) |
562 | return PTR_ERR(ifa); | |
563 | ||
d6062cbb | 564 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
565 | } |
566 | ||
567 | /* | |
568 | * Determine a default network mask, based on the IP address. | |
569 | */ | |
570 | ||
714e85be | 571 | static __inline__ int inet_abc_len(__be32 addr) |
1da177e4 LT |
572 | { |
573 | int rc = -1; /* Something else, probably a multicast. */ | |
574 | ||
f97c1e0c | 575 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 576 | rc = 0; |
1da177e4 | 577 | else { |
714e85be | 578 | __u32 haddr = ntohl(addr); |
1da177e4 | 579 | |
714e85be | 580 | if (IN_CLASSA(haddr)) |
1da177e4 | 581 | rc = 8; |
714e85be | 582 | else if (IN_CLASSB(haddr)) |
1da177e4 | 583 | rc = 16; |
714e85be | 584 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
585 | rc = 24; |
586 | } | |
587 | ||
e905a9ed | 588 | return rc; |
1da177e4 LT |
589 | } |
590 | ||
591 | ||
e5b13cb1 | 592 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
593 | { |
594 | struct ifreq ifr; | |
595 | struct sockaddr_in sin_orig; | |
596 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
597 | struct in_device *in_dev; | |
598 | struct in_ifaddr **ifap = NULL; | |
599 | struct in_ifaddr *ifa = NULL; | |
600 | struct net_device *dev; | |
601 | char *colon; | |
602 | int ret = -EFAULT; | |
603 | int tryaddrmatch = 0; | |
604 | ||
605 | /* | |
606 | * Fetch the caller's info block into kernel space | |
607 | */ | |
608 | ||
609 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
610 | goto out; | |
611 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
612 | ||
613 | /* save original address for comparison */ | |
614 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
615 | ||
616 | colon = strchr(ifr.ifr_name, ':'); | |
617 | if (colon) | |
618 | *colon = 0; | |
619 | ||
620 | #ifdef CONFIG_KMOD | |
e5b13cb1 | 621 | dev_load(net, ifr.ifr_name); |
1da177e4 LT |
622 | #endif |
623 | ||
132adf54 | 624 | switch (cmd) { |
1da177e4 LT |
625 | case SIOCGIFADDR: /* Get interface address */ |
626 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
627 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
628 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
629 | /* Note that these ioctls will not sleep, | |
630 | so that we do not impose a lock. | |
631 | One day we will be forced to put shlock here (I mean SMP) | |
632 | */ | |
633 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
634 | memset(sin, 0, sizeof(*sin)); | |
635 | sin->sin_family = AF_INET; | |
636 | break; | |
637 | ||
638 | case SIOCSIFFLAGS: | |
639 | ret = -EACCES; | |
640 | if (!capable(CAP_NET_ADMIN)) | |
641 | goto out; | |
642 | break; | |
643 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
644 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
645 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
646 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
647 | ret = -EACCES; | |
648 | if (!capable(CAP_NET_ADMIN)) | |
649 | goto out; | |
650 | ret = -EINVAL; | |
651 | if (sin->sin_family != AF_INET) | |
652 | goto out; | |
653 | break; | |
654 | default: | |
655 | ret = -EINVAL; | |
656 | goto out; | |
657 | } | |
658 | ||
659 | rtnl_lock(); | |
660 | ||
661 | ret = -ENODEV; | |
e5b13cb1 | 662 | if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL) |
1da177e4 LT |
663 | goto done; |
664 | ||
665 | if (colon) | |
666 | *colon = ':'; | |
667 | ||
e5ed6399 | 668 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
669 | if (tryaddrmatch) { |
670 | /* Matthias Andree */ | |
671 | /* compare label and address (4.4BSD style) */ | |
672 | /* note: we only do this for a limited set of ioctls | |
673 | and only if the original address family was AF_INET. | |
674 | This is checked above. */ | |
675 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
676 | ifap = &ifa->ifa_next) { | |
677 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
678 | sin_orig.sin_addr.s_addr == | |
679 | ifa->ifa_address) { | |
680 | break; /* found */ | |
681 | } | |
682 | } | |
683 | } | |
684 | /* we didn't get a match, maybe the application is | |
685 | 4.3BSD-style and passed in junk so we fall back to | |
686 | comparing just the label */ | |
687 | if (!ifa) { | |
688 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
689 | ifap = &ifa->ifa_next) | |
690 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
691 | break; | |
692 | } | |
693 | } | |
694 | ||
695 | ret = -EADDRNOTAVAIL; | |
696 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
697 | goto done; | |
698 | ||
132adf54 | 699 | switch (cmd) { |
1da177e4 LT |
700 | case SIOCGIFADDR: /* Get interface address */ |
701 | sin->sin_addr.s_addr = ifa->ifa_local; | |
702 | goto rarok; | |
703 | ||
704 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
705 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
706 | goto rarok; | |
707 | ||
708 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
709 | sin->sin_addr.s_addr = ifa->ifa_address; | |
710 | goto rarok; | |
711 | ||
712 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
713 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
714 | goto rarok; | |
715 | ||
716 | case SIOCSIFFLAGS: | |
717 | if (colon) { | |
718 | ret = -EADDRNOTAVAIL; | |
719 | if (!ifa) | |
720 | break; | |
721 | ret = 0; | |
722 | if (!(ifr.ifr_flags & IFF_UP)) | |
723 | inet_del_ifa(in_dev, ifap, 1); | |
724 | break; | |
725 | } | |
726 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
727 | break; | |
728 | ||
729 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
730 | ret = -EINVAL; | |
731 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
732 | break; | |
733 | ||
734 | if (!ifa) { | |
735 | ret = -ENOBUFS; | |
736 | if ((ifa = inet_alloc_ifa()) == NULL) | |
737 | break; | |
738 | if (colon) | |
739 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
740 | else | |
741 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
742 | } else { | |
743 | ret = 0; | |
744 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
745 | break; | |
746 | inet_del_ifa(in_dev, ifap, 0); | |
747 | ifa->ifa_broadcast = 0; | |
748 | ifa->ifa_anycast = 0; | |
148f9729 | 749 | ifa->ifa_scope = 0; |
1da177e4 LT |
750 | } |
751 | ||
752 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
753 | ||
754 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
755 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
756 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
757 | if ((dev->flags & IFF_BROADCAST) && | |
758 | ifa->ifa_prefixlen < 31) | |
759 | ifa->ifa_broadcast = ifa->ifa_address | | |
760 | ~ifa->ifa_mask; | |
761 | } else { | |
762 | ifa->ifa_prefixlen = 32; | |
763 | ifa->ifa_mask = inet_make_mask(32); | |
764 | } | |
765 | ret = inet_set_ifa(dev, ifa); | |
766 | break; | |
767 | ||
768 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
769 | ret = 0; | |
770 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
771 | inet_del_ifa(in_dev, ifap, 0); | |
772 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
773 | inet_insert_ifa(ifa); | |
774 | } | |
775 | break; | |
776 | ||
777 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
778 | ret = 0; | |
779 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
780 | break; | |
781 | ret = -EINVAL; | |
782 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
783 | break; | |
784 | ret = 0; | |
785 | inet_del_ifa(in_dev, ifap, 0); | |
786 | ifa->ifa_address = sin->sin_addr.s_addr; | |
787 | inet_insert_ifa(ifa); | |
788 | break; | |
789 | ||
790 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
791 | ||
792 | /* | |
793 | * The mask we set must be legal. | |
794 | */ | |
795 | ret = -EINVAL; | |
796 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
797 | break; | |
798 | ret = 0; | |
799 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 800 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
801 | inet_del_ifa(in_dev, ifap, 0); |
802 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
803 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
804 | ||
805 | /* See if current broadcast address matches | |
806 | * with current netmask, then recalculate | |
807 | * the broadcast address. Otherwise it's a | |
808 | * funny address, so don't touch it since | |
809 | * the user seems to know what (s)he's doing... | |
810 | */ | |
811 | if ((dev->flags & IFF_BROADCAST) && | |
812 | (ifa->ifa_prefixlen < 31) && | |
813 | (ifa->ifa_broadcast == | |
dcab5e1e | 814 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
815 | ifa->ifa_broadcast = (ifa->ifa_local | |
816 | ~sin->sin_addr.s_addr); | |
817 | } | |
818 | inet_insert_ifa(ifa); | |
819 | } | |
820 | break; | |
821 | } | |
822 | done: | |
823 | rtnl_unlock(); | |
824 | out: | |
825 | return ret; | |
826 | rarok: | |
827 | rtnl_unlock(); | |
828 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
829 | goto out; | |
830 | } | |
831 | ||
832 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
833 | { | |
e5ed6399 | 834 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
835 | struct in_ifaddr *ifa; |
836 | struct ifreq ifr; | |
837 | int done = 0; | |
838 | ||
839 | if (!in_dev || (ifa = in_dev->ifa_list) == NULL) | |
840 | goto out; | |
841 | ||
842 | for (; ifa; ifa = ifa->ifa_next) { | |
843 | if (!buf) { | |
844 | done += sizeof(ifr); | |
845 | continue; | |
846 | } | |
847 | if (len < (int) sizeof(ifr)) | |
848 | break; | |
849 | memset(&ifr, 0, sizeof(struct ifreq)); | |
850 | if (ifa->ifa_label) | |
851 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
852 | else | |
853 | strcpy(ifr.ifr_name, dev->name); | |
854 | ||
855 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
856 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
857 | ifa->ifa_local; | |
858 | ||
859 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
860 | done = -EFAULT; | |
861 | break; | |
862 | } | |
863 | buf += sizeof(struct ifreq); | |
864 | len -= sizeof(struct ifreq); | |
865 | done += sizeof(struct ifreq); | |
866 | } | |
867 | out: | |
868 | return done; | |
869 | } | |
870 | ||
a61ced5d | 871 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 872 | { |
a61ced5d | 873 | __be32 addr = 0; |
1da177e4 | 874 | struct in_device *in_dev; |
c4544c72 | 875 | struct net *net = dev->nd_net; |
1da177e4 LT |
876 | |
877 | rcu_read_lock(); | |
e5ed6399 | 878 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
879 | if (!in_dev) |
880 | goto no_in_dev; | |
881 | ||
882 | for_primary_ifa(in_dev) { | |
883 | if (ifa->ifa_scope > scope) | |
884 | continue; | |
885 | if (!dst || inet_ifa_match(dst, ifa)) { | |
886 | addr = ifa->ifa_local; | |
887 | break; | |
888 | } | |
889 | if (!addr) | |
890 | addr = ifa->ifa_local; | |
891 | } endfor_ifa(in_dev); | |
892 | no_in_dev: | |
893 | rcu_read_unlock(); | |
894 | ||
895 | if (addr) | |
896 | goto out; | |
897 | ||
898 | /* Not loopback addresses on loopback should be preferred | |
899 | in this case. It is importnat that lo is the first interface | |
900 | in dev_base list. | |
901 | */ | |
902 | read_lock(&dev_base_lock); | |
903 | rcu_read_lock(); | |
c4544c72 | 904 | for_each_netdev(net, dev) { |
e5ed6399 | 905 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) |
1da177e4 LT |
906 | continue; |
907 | ||
908 | for_primary_ifa(in_dev) { | |
909 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
910 | ifa->ifa_scope <= scope) { | |
911 | addr = ifa->ifa_local; | |
912 | goto out_unlock_both; | |
913 | } | |
914 | } endfor_ifa(in_dev); | |
915 | } | |
916 | out_unlock_both: | |
917 | read_unlock(&dev_base_lock); | |
918 | rcu_read_unlock(); | |
919 | out: | |
920 | return addr; | |
921 | } | |
922 | ||
60cad5da AV |
923 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
924 | __be32 local, int scope) | |
1da177e4 LT |
925 | { |
926 | int same = 0; | |
a144ea4b | 927 | __be32 addr = 0; |
1da177e4 LT |
928 | |
929 | for_ifa(in_dev) { | |
930 | if (!addr && | |
931 | (local == ifa->ifa_local || !local) && | |
932 | ifa->ifa_scope <= scope) { | |
933 | addr = ifa->ifa_local; | |
934 | if (same) | |
935 | break; | |
936 | } | |
937 | if (!same) { | |
938 | same = (!local || inet_ifa_match(local, ifa)) && | |
939 | (!dst || inet_ifa_match(dst, ifa)); | |
940 | if (same && addr) { | |
941 | if (local || !dst) | |
942 | break; | |
943 | /* Is the selected addr into dst subnet? */ | |
944 | if (inet_ifa_match(addr, ifa)) | |
945 | break; | |
946 | /* No, then can we use new local src? */ | |
947 | if (ifa->ifa_scope <= scope) { | |
948 | addr = ifa->ifa_local; | |
949 | break; | |
950 | } | |
951 | /* search for large dst subnet for addr */ | |
952 | same = 0; | |
953 | } | |
954 | } | |
955 | } endfor_ifa(in_dev); | |
956 | ||
957 | return same? addr : 0; | |
958 | } | |
959 | ||
960 | /* | |
961 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 962 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
963 | * - dst: only in the same subnet as dst, 0=any dst |
964 | * - local: address, 0=autoselect the local address | |
965 | * - scope: maximum allowed scope value for the local address | |
966 | */ | |
9bd85e32 DL |
967 | __be32 inet_confirm_addr(struct in_device *in_dev, |
968 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 969 | { |
60cad5da | 970 | __be32 addr = 0; |
9bd85e32 | 971 | struct net_device *dev; |
39a6d063 | 972 | struct net *net; |
1da177e4 | 973 | |
39a6d063 | 974 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 975 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 976 | |
39a6d063 | 977 | net = in_dev->dev->nd_net; |
1da177e4 LT |
978 | read_lock(&dev_base_lock); |
979 | rcu_read_lock(); | |
39a6d063 | 980 | for_each_netdev(net, dev) { |
e5ed6399 | 981 | if ((in_dev = __in_dev_get_rcu(dev))) { |
1da177e4 LT |
982 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
983 | if (addr) | |
984 | break; | |
985 | } | |
986 | } | |
987 | rcu_read_unlock(); | |
988 | read_unlock(&dev_base_lock); | |
989 | ||
990 | return addr; | |
991 | } | |
992 | ||
993 | /* | |
994 | * Device notifier | |
995 | */ | |
996 | ||
997 | int register_inetaddr_notifier(struct notifier_block *nb) | |
998 | { | |
e041c683 | 999 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 LT |
1000 | } |
1001 | ||
1002 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1003 | { | |
e041c683 | 1004 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 LT |
1005 | } |
1006 | ||
1007 | /* Rename ifa_labels for a device name change. Make some effort to preserve existing | |
1008 | * alias numbering and to create unique labels if possible. | |
1009 | */ | |
1010 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1011 | { |
1da177e4 LT |
1012 | struct in_ifaddr *ifa; |
1013 | int named = 0; | |
1014 | ||
e905a9ed YH |
1015 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1016 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1017 | |
1018 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1019 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 LT |
1020 | if (named++ == 0) |
1021 | continue; | |
44344b2a | 1022 | dot = strchr(old, ':'); |
e905a9ed YH |
1023 | if (dot == NULL) { |
1024 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1025 | dot = old; |
1026 | } | |
e905a9ed YH |
1027 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { |
1028 | strcat(ifa->ifa_label, dot); | |
1029 | } else { | |
1030 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
1031 | } | |
1032 | } | |
1033 | } | |
1da177e4 LT |
1034 | |
1035 | /* Called only under RTNL semaphore */ | |
1036 | ||
1037 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1038 | void *ptr) | |
1039 | { | |
1040 | struct net_device *dev = ptr; | |
e5ed6399 | 1041 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1042 | |
1043 | ASSERT_RTNL(); | |
1044 | ||
1045 | if (!in_dev) { | |
8030f544 | 1046 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1047 | in_dev = inetdev_init(dev); |
b217d616 HX |
1048 | if (!in_dev) |
1049 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1050 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1051 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1052 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1053 | } |
1da177e4 LT |
1054 | } |
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | switch (event) { | |
1059 | case NETDEV_REGISTER: | |
1060 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1061 | dev->ip_ptr = NULL; | |
1062 | break; | |
1063 | case NETDEV_UP: | |
1064 | if (dev->mtu < 68) | |
1065 | break; | |
0cc217e1 | 1066 | if (dev->flags & IFF_LOOPBACK) { |
1da177e4 LT |
1067 | struct in_ifaddr *ifa; |
1068 | if ((ifa = inet_alloc_ifa()) != NULL) { | |
1069 | ifa->ifa_local = | |
1070 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1071 | ifa->ifa_prefixlen = 8; | |
1072 | ifa->ifa_mask = inet_make_mask(8); | |
1073 | in_dev_hold(in_dev); | |
1074 | ifa->ifa_dev = in_dev; | |
1075 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1076 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1077 | inet_insert_ifa(ifa); | |
1078 | } | |
1079 | } | |
1080 | ip_mc_up(in_dev); | |
1081 | break; | |
1082 | case NETDEV_DOWN: | |
1083 | ip_mc_down(in_dev); | |
1084 | break; | |
1085 | case NETDEV_CHANGEMTU: | |
1086 | if (dev->mtu >= 68) | |
1087 | break; | |
1088 | /* MTU falled under 68, disable IP */ | |
1089 | case NETDEV_UNREGISTER: | |
1090 | inetdev_destroy(in_dev); | |
1091 | break; | |
1092 | case NETDEV_CHANGENAME: | |
1093 | /* Do not notify about label change, this event is | |
1094 | * not interesting to applications using netlink. | |
1095 | */ | |
1096 | inetdev_changename(dev, in_dev); | |
1097 | ||
51602b2a | 1098 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1099 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1100 | break; |
1101 | } | |
1102 | out: | |
1103 | return NOTIFY_DONE; | |
1104 | } | |
1105 | ||
1106 | static struct notifier_block ip_netdev_notifier = { | |
1107 | .notifier_call =inetdev_event, | |
1108 | }; | |
1109 | ||
339bf98f TG |
1110 | static inline size_t inet_nlmsg_size(void) |
1111 | { | |
1112 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1113 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1114 | + nla_total_size(4) /* IFA_LOCAL */ | |
1115 | + nla_total_size(4) /* IFA_BROADCAST */ | |
1116 | + nla_total_size(4) /* IFA_ANYCAST */ | |
1117 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ | |
1118 | } | |
1119 | ||
1da177e4 | 1120 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1121 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1122 | { |
1123 | struct ifaddrmsg *ifm; | |
1124 | struct nlmsghdr *nlh; | |
1da177e4 | 1125 | |
47f68512 TG |
1126 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1127 | if (nlh == NULL) | |
26932566 | 1128 | return -EMSGSIZE; |
47f68512 TG |
1129 | |
1130 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1131 | ifm->ifa_family = AF_INET; |
1132 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1133 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1134 | ifm->ifa_scope = ifa->ifa_scope; | |
1135 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1136 | |
1da177e4 | 1137 | if (ifa->ifa_address) |
a7a628c4 | 1138 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1139 | |
1da177e4 | 1140 | if (ifa->ifa_local) |
a7a628c4 | 1141 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1142 | |
1da177e4 | 1143 | if (ifa->ifa_broadcast) |
a7a628c4 | 1144 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1145 | |
1da177e4 | 1146 | if (ifa->ifa_anycast) |
a7a628c4 | 1147 | NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast); |
47f68512 | 1148 | |
1da177e4 | 1149 | if (ifa->ifa_label[0]) |
47f68512 | 1150 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1151 | |
47f68512 TG |
1152 | return nlmsg_end(skb, nlh); |
1153 | ||
1154 | nla_put_failure: | |
26932566 PM |
1155 | nlmsg_cancel(skb, nlh); |
1156 | return -EMSGSIZE; | |
1da177e4 LT |
1157 | } |
1158 | ||
1159 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1160 | { | |
b854272b | 1161 | struct net *net = skb->sk->sk_net; |
1da177e4 LT |
1162 | int idx, ip_idx; |
1163 | struct net_device *dev; | |
1164 | struct in_device *in_dev; | |
1165 | struct in_ifaddr *ifa; | |
1166 | int s_ip_idx, s_idx = cb->args[0]; | |
1167 | ||
1168 | s_ip_idx = ip_idx = cb->args[1]; | |
7562f876 | 1169 | idx = 0; |
4b8aa9ab | 1170 | for_each_netdev(net, dev) { |
1da177e4 | 1171 | if (idx < s_idx) |
7562f876 | 1172 | goto cont; |
1da177e4 LT |
1173 | if (idx > s_idx) |
1174 | s_ip_idx = 0; | |
6313c1e0 | 1175 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
7562f876 | 1176 | goto cont; |
1da177e4 LT |
1177 | |
1178 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1179 | ifa = ifa->ifa_next, ip_idx++) { | |
1180 | if (ip_idx < s_ip_idx) | |
596e4150 | 1181 | continue; |
1da177e4 LT |
1182 | if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, |
1183 | cb->nlh->nlmsg_seq, | |
6313c1e0 | 1184 | RTM_NEWADDR, NLM_F_MULTI) <= 0) |
1da177e4 | 1185 | goto done; |
1da177e4 | 1186 | } |
7562f876 PE |
1187 | cont: |
1188 | idx++; | |
1da177e4 LT |
1189 | } |
1190 | ||
1191 | done: | |
1da177e4 LT |
1192 | cb->args[0] = idx; |
1193 | cb->args[1] = ip_idx; | |
1194 | ||
1195 | return skb->len; | |
1196 | } | |
1197 | ||
d6062cbb TG |
1198 | static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh, |
1199 | u32 pid) | |
1da177e4 | 1200 | { |
47f68512 | 1201 | struct sk_buff *skb; |
d6062cbb TG |
1202 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1203 | int err = -ENOBUFS; | |
4b8aa9ab | 1204 | struct net *net; |
1da177e4 | 1205 | |
4b8aa9ab | 1206 | net = ifa->ifa_dev->dev->nd_net; |
339bf98f | 1207 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1208 | if (skb == NULL) |
d6062cbb TG |
1209 | goto errout; |
1210 | ||
1211 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1212 | if (err < 0) { |
1213 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1214 | WARN_ON(err == -EMSGSIZE); | |
1215 | kfree_skb(skb); | |
1216 | goto errout; | |
1217 | } | |
4b8aa9ab | 1218 | err = rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
d6062cbb TG |
1219 | errout: |
1220 | if (err < 0) | |
4b8aa9ab | 1221 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1222 | } |
1223 | ||
1da177e4 LT |
1224 | #ifdef CONFIG_SYSCTL |
1225 | ||
c0ce9fb3 | 1226 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1227 | { |
1228 | struct net_device *dev; | |
1229 | ||
1230 | read_lock(&dev_base_lock); | |
c0ce9fb3 | 1231 | for_each_netdev(net, dev) { |
31be3085 HX |
1232 | struct in_device *in_dev; |
1233 | rcu_read_lock(); | |
1234 | in_dev = __in_dev_get_rcu(dev); | |
1235 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1236 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 HX |
1237 | rcu_read_unlock(); |
1238 | } | |
1239 | read_unlock(&dev_base_lock); | |
1240 | } | |
1241 | ||
c0ce9fb3 | 1242 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1243 | { |
1244 | struct net_device *dev; | |
586f1211 | 1245 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1246 | |
586f1211 | 1247 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1248 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
68dd299b PE |
1249 | |
1250 | read_lock(&dev_base_lock); | |
c0ce9fb3 | 1251 | for_each_netdev(net, dev) { |
68dd299b PE |
1252 | struct in_device *in_dev; |
1253 | rcu_read_lock(); | |
1254 | in_dev = __in_dev_get_rcu(dev); | |
1255 | if (in_dev) | |
1256 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1257 | rcu_read_unlock(); | |
1258 | } | |
1259 | read_unlock(&dev_base_lock); | |
1260 | ||
1261 | rt_cache_flush(0); | |
1262 | } | |
1263 | ||
31be3085 HX |
1264 | static int devinet_conf_proc(ctl_table *ctl, int write, |
1265 | struct file* filp, void __user *buffer, | |
1266 | size_t *lenp, loff_t *ppos) | |
1267 | { | |
1268 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1269 | ||
1270 | if (write) { | |
1271 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1272 | struct net *net = ctl->extra2; |
31be3085 HX |
1273 | int i = (int *)ctl->data - cnf->data; |
1274 | ||
1275 | set_bit(i, cnf->state); | |
1276 | ||
9355bbd6 | 1277 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1278 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1279 | } |
1280 | ||
1281 | return ret; | |
1282 | } | |
1283 | ||
1284 | static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen, | |
1285 | void __user *oldval, size_t __user *oldlenp, | |
1286 | void __user *newval, size_t newlen) | |
1287 | { | |
1288 | struct ipv4_devconf *cnf; | |
c0ce9fb3 | 1289 | struct net *net; |
31be3085 HX |
1290 | int *valp = table->data; |
1291 | int new; | |
1292 | int i; | |
1293 | ||
1294 | if (!newval || !newlen) | |
1295 | return 0; | |
1296 | ||
1297 | if (newlen != sizeof(int)) | |
1298 | return -EINVAL; | |
1299 | ||
1300 | if (get_user(new, (int __user *)newval)) | |
1301 | return -EFAULT; | |
1302 | ||
1303 | if (new == *valp) | |
1304 | return 0; | |
1305 | ||
1306 | if (oldval && oldlenp) { | |
1307 | size_t len; | |
1308 | ||
1309 | if (get_user(len, oldlenp)) | |
1310 | return -EFAULT; | |
1311 | ||
1312 | if (len) { | |
1313 | if (len > table->maxlen) | |
1314 | len = table->maxlen; | |
1315 | if (copy_to_user(oldval, valp, len)) | |
1316 | return -EFAULT; | |
1317 | if (put_user(len, oldlenp)) | |
1318 | return -EFAULT; | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | *valp = new; | |
1323 | ||
1324 | cnf = table->extra1; | |
c0ce9fb3 | 1325 | net = table->extra2; |
31be3085 HX |
1326 | i = (int *)table->data - cnf->data; |
1327 | ||
1328 | set_bit(i, cnf->state); | |
1329 | ||
9355bbd6 | 1330 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1331 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1332 | |
1333 | return 1; | |
1334 | } | |
1335 | ||
1da177e4 LT |
1336 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
1337 | struct file* filp, void __user *buffer, | |
1338 | size_t *lenp, loff_t *ppos) | |
1339 | { | |
1340 | int *valp = ctl->data; | |
1341 | int val = *valp; | |
1342 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1343 | ||
1344 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1345 | struct net *net = ctl->extra2; |
1346 | ||
586f1211 | 1347 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) |
c0ce9fb3 | 1348 | inet_forward_change(net); |
9355bbd6 | 1349 | else if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) |
1da177e4 LT |
1350 | rt_cache_flush(0); |
1351 | } | |
1352 | ||
1353 | return ret; | |
1354 | } | |
1355 | ||
1356 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
1357 | struct file* filp, void __user *buffer, | |
1358 | size_t *lenp, loff_t *ppos) | |
1359 | { | |
1360 | int *valp = ctl->data; | |
1361 | int val = *valp; | |
1362 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1363 | ||
1364 | if (write && *valp != val) | |
1365 | rt_cache_flush(0); | |
1366 | ||
1367 | return ret; | |
1368 | } | |
1369 | ||
1370 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
1371 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 1372 | void __user *newval, size_t newlen) |
1da177e4 | 1373 | { |
31be3085 HX |
1374 | int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp, |
1375 | newval, newlen); | |
1da177e4 | 1376 | |
31be3085 HX |
1377 | if (ret == 1) |
1378 | rt_cache_flush(0); | |
1da177e4 | 1379 | |
31be3085 | 1380 | return ret; |
1da177e4 LT |
1381 | } |
1382 | ||
1383 | ||
42f811b8 HX |
1384 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \ |
1385 | { \ | |
1386 | .ctl_name = NET_IPV4_CONF_ ## attr, \ | |
1387 | .procname = name, \ | |
1388 | .data = ipv4_devconf.data + \ | |
1389 | NET_IPV4_CONF_ ## attr - 1, \ | |
1390 | .maxlen = sizeof(int), \ | |
1391 | .mode = mval, \ | |
1392 | .proc_handler = proc, \ | |
1393 | .strategy = sysctl, \ | |
31be3085 | 1394 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1395 | } |
1396 | ||
1397 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
31be3085 HX |
1398 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \ |
1399 | devinet_conf_sysctl) | |
42f811b8 HX |
1400 | |
1401 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
31be3085 HX |
1402 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \ |
1403 | devinet_conf_sysctl) | |
42f811b8 HX |
1404 | |
1405 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \ | |
1406 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl) | |
1407 | ||
1408 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
1409 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \ | |
1410 | ipv4_doint_and_flush_strategy) | |
1411 | ||
1da177e4 LT |
1412 | static struct devinet_sysctl_table { |
1413 | struct ctl_table_header *sysctl_header; | |
bfada697 PE |
1414 | struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; |
1415 | char *dev_name; | |
1da177e4 LT |
1416 | } devinet_sysctl = { |
1417 | .devinet_vars = { | |
42f811b8 | 1418 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
31be3085 HX |
1419 | devinet_sysctl_forward, |
1420 | devinet_conf_sysctl), | |
42f811b8 HX |
1421 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1422 | ||
1423 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1424 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1425 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1426 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1427 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1428 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1429 | "accept_source_route"), | |
1430 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), | |
1431 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1432 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1433 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1434 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1435 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1436 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1437 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1438 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
1439 | ||
1440 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1441 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1442 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1443 | "force_igmp_version"), | |
1444 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1445 | "promote_secondaries"), | |
1da177e4 | 1446 | }, |
1da177e4 LT |
1447 | }; |
1448 | ||
ea40b324 PE |
1449 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
1450 | int ctl_name, struct ipv4_devconf *p) | |
1da177e4 LT |
1451 | { |
1452 | int i; | |
9fa89642 | 1453 | struct devinet_sysctl_table *t; |
1da177e4 | 1454 | |
bfada697 PE |
1455 | #define DEVINET_CTL_PATH_DEV 3 |
1456 | ||
1457 | struct ctl_path devinet_ctl_path[] = { | |
1458 | { .procname = "net", .ctl_name = CTL_NET, }, | |
1459 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1460 | { .procname = "conf", .ctl_name = NET_IPV4_CONF, }, | |
1461 | { /* to be set */ }, | |
1462 | { }, | |
1463 | }; | |
1464 | ||
9fa89642 | 1465 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1466 | if (!t) |
9fa89642 PE |
1467 | goto out; |
1468 | ||
1da177e4 LT |
1469 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1470 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1471 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1472 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1473 | } |
1474 | ||
e905a9ed YH |
1475 | /* |
1476 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1477 | * by sysctl and we wouldn't want anyone to change it under our feet |
1478 | * (see SIOCSIFNAME). | |
e905a9ed | 1479 | */ |
bfada697 PE |
1480 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1481 | if (!t->dev_name) | |
9fa89642 | 1482 | goto free; |
1da177e4 | 1483 | |
bfada697 PE |
1484 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1485 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name; | |
1da177e4 | 1486 | |
752d14dc | 1487 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, |
bfada697 | 1488 | t->devinet_vars); |
1da177e4 | 1489 | if (!t->sysctl_header) |
9fa89642 | 1490 | goto free_procname; |
1da177e4 LT |
1491 | |
1492 | p->sysctl = t; | |
ea40b324 | 1493 | return 0; |
1da177e4 | 1494 | |
9fa89642 | 1495 | free_procname: |
bfada697 | 1496 | kfree(t->dev_name); |
9fa89642 | 1497 | free: |
1da177e4 | 1498 | kfree(t); |
9fa89642 | 1499 | out: |
ea40b324 | 1500 | return -ENOBUFS; |
1da177e4 LT |
1501 | } |
1502 | ||
51602b2a PE |
1503 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1504 | { | |
1505 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1506 | ||
1507 | if (t == NULL) | |
1508 | return; | |
1509 | ||
1510 | cnf->sysctl = NULL; | |
1511 | unregister_sysctl_table(t->sysctl_header); | |
1512 | kfree(t->dev_name); | |
1513 | kfree(t); | |
1514 | } | |
1515 | ||
66f27a52 PE |
1516 | static void devinet_sysctl_register(struct in_device *idev) |
1517 | { | |
51602b2a PE |
1518 | neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4, |
1519 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
c0ce9fb3 PE |
1520 | __devinet_sysctl_register(idev->dev->nd_net, idev->dev->name, |
1521 | idev->dev->ifindex, &idev->cnf); | |
66f27a52 PE |
1522 | } |
1523 | ||
51602b2a | 1524 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1525 | { |
51602b2a PE |
1526 | __devinet_sysctl_unregister(&idev->cnf); |
1527 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 1528 | } |
1da177e4 | 1529 | |
68dd299b PE |
1530 | static struct ctl_table ctl_forward_entry[] = { |
1531 | { | |
1532 | .ctl_name = NET_IPV4_FORWARD, | |
1533 | .procname = "ip_forward", | |
1534 | .data = &ipv4_devconf.data[ | |
1535 | NET_IPV4_CONF_FORWARDING - 1], | |
1536 | .maxlen = sizeof(int), | |
1537 | .mode = 0644, | |
1538 | .proc_handler = devinet_sysctl_forward, | |
1539 | .strategy = devinet_conf_sysctl, | |
1540 | .extra1 = &ipv4_devconf, | |
c0ce9fb3 | 1541 | .extra2 = &init_net, |
68dd299b PE |
1542 | }, |
1543 | { }, | |
1544 | }; | |
1545 | ||
752d14dc | 1546 | static __net_initdata struct ctl_path net_ipv4_path[] = { |
68dd299b PE |
1547 | { .procname = "net", .ctl_name = CTL_NET, }, |
1548 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1549 | { }, | |
1550 | }; | |
2a75de0c | 1551 | #endif |
68dd299b | 1552 | |
752d14dc PE |
1553 | static __net_init int devinet_init_net(struct net *net) |
1554 | { | |
1555 | int err; | |
752d14dc | 1556 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
1557 | #ifdef CONFIG_SYSCTL |
1558 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 1559 | struct ctl_table_header *forw_hdr; |
2a75de0c | 1560 | #endif |
752d14dc PE |
1561 | |
1562 | err = -ENOMEM; | |
1563 | all = &ipv4_devconf; | |
1564 | dflt = &ipv4_devconf_dflt; | |
752d14dc PE |
1565 | |
1566 | if (net != &init_net) { | |
1567 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); | |
1568 | if (all == NULL) | |
1569 | goto err_alloc_all; | |
1570 | ||
1571 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1572 | if (dflt == NULL) | |
1573 | goto err_alloc_dflt; | |
1574 | ||
2a75de0c | 1575 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1576 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
1577 | if (tbl == NULL) | |
1578 | goto err_alloc_ctl; | |
1579 | ||
1580 | tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1]; | |
1581 | tbl[0].extra1 = all; | |
1582 | tbl[0].extra2 = net; | |
2a75de0c | 1583 | #endif |
752d14dc PE |
1584 | } |
1585 | ||
1586 | #ifdef CONFIG_SYSCTL | |
1587 | err = __devinet_sysctl_register(net, "all", | |
1588 | NET_PROTO_CONF_ALL, all); | |
1589 | if (err < 0) | |
1590 | goto err_reg_all; | |
1591 | ||
1592 | err = __devinet_sysctl_register(net, "default", | |
1593 | NET_PROTO_CONF_DEFAULT, dflt); | |
1594 | if (err < 0) | |
1595 | goto err_reg_dflt; | |
1596 | ||
1597 | err = -ENOMEM; | |
1598 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1599 | if (forw_hdr == NULL) | |
1600 | goto err_reg_ctl; | |
2a75de0c | 1601 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
1602 | #endif |
1603 | ||
752d14dc PE |
1604 | net->ipv4.devconf_all = all; |
1605 | net->ipv4.devconf_dflt = dflt; | |
1606 | return 0; | |
1607 | ||
1608 | #ifdef CONFIG_SYSCTL | |
1609 | err_reg_ctl: | |
1610 | __devinet_sysctl_unregister(dflt); | |
1611 | err_reg_dflt: | |
1612 | __devinet_sysctl_unregister(all); | |
1613 | err_reg_all: | |
1614 | if (tbl != ctl_forward_entry) | |
1615 | kfree(tbl); | |
752d14dc | 1616 | err_alloc_ctl: |
2a75de0c | 1617 | #endif |
752d14dc PE |
1618 | if (dflt != &ipv4_devconf_dflt) |
1619 | kfree(dflt); | |
1620 | err_alloc_dflt: | |
1621 | if (all != &ipv4_devconf) | |
1622 | kfree(all); | |
1623 | err_alloc_all: | |
1624 | return err; | |
1625 | } | |
1626 | ||
1627 | static __net_exit void devinet_exit_net(struct net *net) | |
1628 | { | |
2a75de0c | 1629 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1630 | struct ctl_table *tbl; |
1631 | ||
1632 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
1633 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
1634 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1635 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 1636 | kfree(tbl); |
2a75de0c | 1637 | #endif |
752d14dc PE |
1638 | kfree(net->ipv4.devconf_dflt); |
1639 | kfree(net->ipv4.devconf_all); | |
1640 | } | |
1641 | ||
1642 | static __net_initdata struct pernet_operations devinet_ops = { | |
1643 | .init = devinet_init_net, | |
1644 | .exit = devinet_exit_net, | |
1645 | }; | |
1646 | ||
1da177e4 LT |
1647 | void __init devinet_init(void) |
1648 | { | |
752d14dc PE |
1649 | register_pernet_subsys(&devinet_ops); |
1650 | ||
1da177e4 LT |
1651 | register_gifconf(PF_INET, inet_gifconf); |
1652 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f TG |
1653 | |
1654 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1655 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1656 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 LT |
1657 | } |
1658 | ||
1da177e4 LT |
1659 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1660 | EXPORT_SYMBOL(inet_select_addr); | |
1661 | EXPORT_SYMBOL(inetdev_by_index); | |
1662 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
1663 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |