Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * NET3 IP device support routines. | |
3 | * | |
1da177e4 LT |
4 | * This program is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Derived from the IP parts of dev.c 1.0.19 | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
13 | * | |
14 | * Additional Authors: | |
15 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
16 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
17 | * | |
18 | * Changes: | |
19 | * Alexey Kuznetsov: pa_* fields are replaced with ifaddr | |
20 | * lists. | |
21 | * Cyrus Durgin: updated for kmod | |
22 | * Matthias Andree: in devinet_ioctl, compare label and | |
23 | * address (4.4BSD alias style support), | |
24 | * fall back to comparing just the label | |
25 | * if no match found. | |
26 | */ | |
27 | ||
1da177e4 LT |
28 | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/system.h> | |
31 | #include <linux/bitops.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/module.h> |
34 | #include <linux/types.h> | |
35 | #include <linux/kernel.h> | |
1da177e4 LT |
36 | #include <linux/string.h> |
37 | #include <linux/mm.h> | |
38 | #include <linux/socket.h> | |
39 | #include <linux/sockios.h> | |
40 | #include <linux/in.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/interrupt.h> | |
1823730f | 43 | #include <linux/if_addr.h> |
1da177e4 LT |
44 | #include <linux/if_ether.h> |
45 | #include <linux/inet.h> | |
46 | #include <linux/netdevice.h> | |
47 | #include <linux/etherdevice.h> | |
48 | #include <linux/skbuff.h> | |
1da177e4 LT |
49 | #include <linux/init.h> |
50 | #include <linux/notifier.h> | |
51 | #include <linux/inetdevice.h> | |
52 | #include <linux/igmp.h> | |
53 | #ifdef CONFIG_SYSCTL | |
54 | #include <linux/sysctl.h> | |
55 | #endif | |
56 | #include <linux/kmod.h> | |
57 | ||
14c85021 | 58 | #include <net/arp.h> |
1da177e4 LT |
59 | #include <net/ip.h> |
60 | #include <net/route.h> | |
61 | #include <net/ip_fib.h> | |
63f3444f | 62 | #include <net/rtnetlink.h> |
752d14dc | 63 | #include <net/net_namespace.h> |
1da177e4 | 64 | |
0027ba84 | 65 | static struct ipv4_devconf ipv4_devconf = { |
42f811b8 HX |
66 | .data = { |
67 | [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1, | |
68 | [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1, | |
69 | [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1, | |
70 | [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1, | |
71 | }, | |
1da177e4 LT |
72 | }; |
73 | ||
74 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
42f811b8 HX |
75 | .data = { |
76 | [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1, | |
77 | [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1, | |
78 | [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1, | |
79 | [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1, | |
80 | [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1, | |
81 | }, | |
1da177e4 LT |
82 | }; |
83 | ||
9355bbd6 PE |
84 | #define IPV4_DEVCONF_DFLT(net, attr) \ |
85 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
42f811b8 | 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 }, | |
5176f91e | 91 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c753978 TG |
92 | }; |
93 | ||
d6062cbb | 94 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 95 | |
e041c683 | 96 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
97 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
98 | int destroy); | |
99 | #ifdef CONFIG_SYSCTL | |
66f27a52 | 100 | static void devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
101 | static void devinet_sysctl_unregister(struct in_device *idev); |
102 | #else | |
103 | static inline void devinet_sysctl_register(struct in_device *idev) | |
104 | { | |
105 | } | |
106 | static inline void devinet_sysctl_unregister(struct in_device *idev) | |
107 | { | |
108 | } | |
1da177e4 LT |
109 | #endif |
110 | ||
111 | /* Locks all the inet devices. */ | |
112 | ||
113 | static struct in_ifaddr *inet_alloc_ifa(void) | |
114 | { | |
0da974f4 | 115 | struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); |
1da177e4 LT |
116 | |
117 | if (ifa) { | |
1da177e4 LT |
118 | INIT_RCU_HEAD(&ifa->rcu_head); |
119 | } | |
120 | ||
121 | return ifa; | |
122 | } | |
123 | ||
124 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
125 | { | |
126 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
127 | if (ifa->ifa_dev) | |
128 | in_dev_put(ifa->ifa_dev); | |
129 | kfree(ifa); | |
130 | } | |
131 | ||
132 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
133 | { | |
134 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
135 | } | |
136 | ||
137 | void in_dev_finish_destroy(struct in_device *idev) | |
138 | { | |
139 | struct net_device *dev = idev->dev; | |
140 | ||
141 | BUG_TRAP(!idev->ifa_list); | |
142 | BUG_TRAP(!idev->mc_list); | |
143 | #ifdef NET_REFCNT_DEBUG | |
144 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
145 | idev, dev ? dev->name : "NIL"); | |
146 | #endif | |
147 | dev_put(dev); | |
148 | if (!idev->dead) | |
149 | printk("Freeing alive in_device %p\n", idev); | |
150 | else { | |
151 | kfree(idev); | |
152 | } | |
153 | } | |
154 | ||
71e27da9 | 155 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
156 | { |
157 | struct in_device *in_dev; | |
158 | ||
159 | ASSERT_RTNL(); | |
160 | ||
0da974f4 | 161 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
162 | if (!in_dev) |
163 | goto out; | |
1da177e4 | 164 | INIT_RCU_HEAD(&in_dev->rcu_head); |
c346dca1 | 165 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 166 | sizeof(in_dev->cnf)); |
1da177e4 LT |
167 | in_dev->cnf.sysctl = NULL; |
168 | in_dev->dev = dev; | |
169 | if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) | |
170 | goto out_kfree; | |
0187bdfb BH |
171 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
172 | dev_disable_lro(dev); | |
1da177e4 LT |
173 | /* Reference in_dev->dev */ |
174 | dev_hold(dev); | |
30c4cf57 | 175 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 176 | in_dev_hold(in_dev); |
1da177e4 | 177 | |
66f27a52 | 178 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
179 | ip_mc_init_dev(in_dev); |
180 | if (dev->flags & IFF_UP) | |
181 | ip_mc_up(in_dev); | |
483479ec | 182 | |
30c4cf57 DS |
183 | /* we can receive as soon as ip_ptr is set -- do this last */ |
184 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 185 | out: |
1da177e4 LT |
186 | return in_dev; |
187 | out_kfree: | |
188 | kfree(in_dev); | |
189 | in_dev = NULL; | |
190 | goto out; | |
191 | } | |
192 | ||
193 | static void in_dev_rcu_put(struct rcu_head *head) | |
194 | { | |
195 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
196 | in_dev_put(idev); | |
197 | } | |
198 | ||
199 | static void inetdev_destroy(struct in_device *in_dev) | |
200 | { | |
201 | struct in_ifaddr *ifa; | |
202 | struct net_device *dev; | |
203 | ||
204 | ASSERT_RTNL(); | |
205 | ||
206 | dev = in_dev->dev; | |
1da177e4 LT |
207 | |
208 | in_dev->dead = 1; | |
209 | ||
210 | ip_mc_destroy_dev(in_dev); | |
211 | ||
212 | while ((ifa = in_dev->ifa_list) != NULL) { | |
213 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
214 | inet_free_ifa(ifa); | |
215 | } | |
216 | ||
1da177e4 LT |
217 | dev->ip_ptr = NULL; |
218 | ||
51602b2a | 219 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
220 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
221 | arp_ifdown(dev); | |
222 | ||
223 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
224 | } | |
225 | ||
ff428d72 | 226 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
227 | { |
228 | rcu_read_lock(); | |
229 | for_primary_ifa(in_dev) { | |
230 | if (inet_ifa_match(a, ifa)) { | |
231 | if (!b || inet_ifa_match(b, ifa)) { | |
232 | rcu_read_unlock(); | |
233 | return 1; | |
234 | } | |
235 | } | |
236 | } endfor_ifa(in_dev); | |
237 | rcu_read_unlock(); | |
238 | return 0; | |
239 | } | |
240 | ||
d6062cbb TG |
241 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
242 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 243 | { |
8f937c60 | 244 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
245 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
246 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
247 | struct in_ifaddr *prev_prom = NULL; | |
248 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
249 | |
250 | ASSERT_RTNL(); | |
251 | ||
e905a9ed | 252 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
253 | * unless alias promotion is set |
254 | **/ | |
1da177e4 LT |
255 | |
256 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
257 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
258 | ||
259 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 260 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
261 | ifa1->ifa_scope <= ifa->ifa_scope) |
262 | last_prim = ifa; | |
263 | ||
1da177e4 LT |
264 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
265 | ifa1->ifa_mask != ifa->ifa_mask || | |
266 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
267 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 268 | prev_prom = ifa; |
1da177e4 LT |
269 | continue; |
270 | } | |
271 | ||
0ff60a45 | 272 | if (!do_promote) { |
8f937c60 | 273 | *ifap1 = ifa->ifa_next; |
1da177e4 | 274 | |
d6062cbb | 275 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
276 | blocking_notifier_call_chain(&inetaddr_chain, |
277 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
278 | inet_free_ifa(ifa); |
279 | } else { | |
280 | promote = ifa; | |
281 | break; | |
282 | } | |
1da177e4 LT |
283 | } |
284 | } | |
285 | ||
286 | /* 2. Unlink it */ | |
287 | ||
288 | *ifap = ifa1->ifa_next; | |
289 | ||
290 | /* 3. Announce address deletion */ | |
291 | ||
292 | /* Send message first, then call notifier. | |
293 | At first sight, FIB update triggered by notifier | |
294 | will refer to already deleted ifaddr, that could confuse | |
295 | netlink listeners. It is not true: look, gated sees | |
296 | that route deleted and if it still thinks that ifaddr | |
297 | is valid, it will try to restore deleted routes... Grr. | |
298 | So that, this order is correct. | |
299 | */ | |
d6062cbb | 300 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 301 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 302 | |
0ff60a45 JHS |
303 | if (promote) { |
304 | ||
305 | if (prev_prom) { | |
306 | prev_prom->ifa_next = promote->ifa_next; | |
307 | promote->ifa_next = last_prim->ifa_next; | |
308 | last_prim->ifa_next = promote; | |
309 | } | |
8f937c60 | 310 | |
8f937c60 | 311 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 312 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
313 | blocking_notifier_call_chain(&inetaddr_chain, |
314 | NETDEV_UP, promote); | |
0ff60a45 JHS |
315 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
316 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
317 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
318 | continue; | |
319 | fib_add_ifaddr(ifa); | |
320 | } | |
321 | ||
322 | } | |
6363097c | 323 | if (destroy) |
0ff60a45 | 324 | inet_free_ifa(ifa1); |
1da177e4 LT |
325 | } |
326 | ||
d6062cbb TG |
327 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
328 | int destroy) | |
329 | { | |
330 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
331 | } | |
332 | ||
333 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
334 | u32 pid) | |
1da177e4 LT |
335 | { |
336 | struct in_device *in_dev = ifa->ifa_dev; | |
337 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
338 | ||
339 | ASSERT_RTNL(); | |
340 | ||
341 | if (!ifa->ifa_local) { | |
342 | inet_free_ifa(ifa); | |
343 | return 0; | |
344 | } | |
345 | ||
346 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
347 | last_primary = &in_dev->ifa_list; | |
348 | ||
349 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
350 | ifap = &ifa1->ifa_next) { | |
351 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
352 | ifa->ifa_scope <= ifa1->ifa_scope) | |
353 | last_primary = &ifa1->ifa_next; | |
354 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
355 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
356 | if (ifa1->ifa_local == ifa->ifa_local) { | |
357 | inet_free_ifa(ifa); | |
358 | return -EEXIST; | |
359 | } | |
360 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
361 | inet_free_ifa(ifa); | |
362 | return -EINVAL; | |
363 | } | |
364 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
365 | } | |
366 | } | |
367 | ||
368 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
369 | net_srandom(ifa->ifa_local); | |
370 | ifap = last_primary; | |
371 | } | |
372 | ||
373 | ifa->ifa_next = *ifap; | |
374 | *ifap = ifa; | |
375 | ||
376 | /* Send message first, then call notifier. | |
377 | Notifier will trigger FIB update, so that | |
378 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 379 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 380 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
381 | |
382 | return 0; | |
383 | } | |
384 | ||
d6062cbb TG |
385 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
386 | { | |
387 | return __inet_insert_ifa(ifa, NULL, 0); | |
388 | } | |
389 | ||
1da177e4 LT |
390 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
391 | { | |
e5ed6399 | 392 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
393 | |
394 | ASSERT_RTNL(); | |
395 | ||
396 | if (!in_dev) { | |
71e27da9 HX |
397 | inet_free_ifa(ifa); |
398 | return -ENOBUFS; | |
1da177e4 | 399 | } |
71e27da9 | 400 | ipv4_devconf_setall(in_dev); |
1da177e4 LT |
401 | if (ifa->ifa_dev != in_dev) { |
402 | BUG_TRAP(!ifa->ifa_dev); | |
403 | in_dev_hold(in_dev); | |
404 | ifa->ifa_dev = in_dev; | |
405 | } | |
f97c1e0c | 406 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
407 | ifa->ifa_scope = RT_SCOPE_HOST; |
408 | return inet_insert_ifa(ifa); | |
409 | } | |
410 | ||
7fee0ca2 | 411 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
412 | { |
413 | struct net_device *dev; | |
414 | struct in_device *in_dev = NULL; | |
415 | read_lock(&dev_base_lock); | |
7fee0ca2 | 416 | dev = __dev_get_by_index(net, ifindex); |
1da177e4 LT |
417 | if (dev) |
418 | in_dev = in_dev_get(dev); | |
419 | read_unlock(&dev_base_lock); | |
420 | return in_dev; | |
421 | } | |
422 | ||
423 | /* Called only from RTNL semaphored context. No locks. */ | |
424 | ||
60cad5da AV |
425 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
426 | __be32 mask) | |
1da177e4 LT |
427 | { |
428 | ASSERT_RTNL(); | |
429 | ||
430 | for_primary_ifa(in_dev) { | |
431 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
432 | return ifa; | |
433 | } endfor_ifa(in_dev); | |
434 | return NULL; | |
435 | } | |
436 | ||
437 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
438 | { | |
3b1e0a65 | 439 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 440 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 441 | struct in_device *in_dev; |
dfdd5fd4 | 442 | struct ifaddrmsg *ifm; |
1da177e4 | 443 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 444 | int err = -EINVAL; |
1da177e4 LT |
445 | |
446 | ASSERT_RTNL(); | |
447 | ||
dfdd5fd4 TG |
448 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
449 | if (err < 0) | |
450 | goto errout; | |
451 | ||
452 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 453 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
dfdd5fd4 TG |
454 | if (in_dev == NULL) { |
455 | err = -ENODEV; | |
456 | goto errout; | |
457 | } | |
458 | ||
1da177e4 LT |
459 | __in_dev_put(in_dev); |
460 | ||
461 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
462 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 463 | if (tb[IFA_LOCAL] && |
a7a628c4 | 464 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
465 | continue; |
466 | ||
467 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 468 | continue; |
dfdd5fd4 TG |
469 | |
470 | if (tb[IFA_ADDRESS] && | |
471 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 472 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
473 | continue; |
474 | ||
d6062cbb | 475 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
476 | return 0; |
477 | } | |
dfdd5fd4 TG |
478 | |
479 | err = -EADDRNOTAVAIL; | |
480 | errout: | |
481 | return err; | |
1da177e4 LT |
482 | } |
483 | ||
4b8aa9ab | 484 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) |
1da177e4 | 485 | { |
5c753978 TG |
486 | struct nlattr *tb[IFA_MAX+1]; |
487 | struct in_ifaddr *ifa; | |
488 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
489 | struct net_device *dev; |
490 | struct in_device *in_dev; | |
7b218574 | 491 | int err; |
1da177e4 | 492 | |
5c753978 TG |
493 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
494 | if (err < 0) | |
495 | goto errout; | |
1da177e4 | 496 | |
5c753978 | 497 | ifm = nlmsg_data(nlh); |
7b218574 DL |
498 | err = -EINVAL; |
499 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
5c753978 | 500 | goto errout; |
1da177e4 | 501 | |
4b8aa9ab | 502 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 DL |
503 | err = -ENODEV; |
504 | if (dev == NULL) | |
5c753978 | 505 | goto errout; |
1da177e4 | 506 | |
5c753978 | 507 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 DL |
508 | err = -ENOBUFS; |
509 | if (in_dev == NULL) | |
71e27da9 | 510 | goto errout; |
1da177e4 | 511 | |
5c753978 | 512 | ifa = inet_alloc_ifa(); |
7b218574 | 513 | if (ifa == NULL) |
5c753978 TG |
514 | /* |
515 | * A potential indev allocation can be left alive, it stays | |
516 | * assigned to its device and is destroy with it. | |
517 | */ | |
5c753978 | 518 | goto errout; |
5c753978 | 519 | |
a4e65d36 | 520 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
521 | in_dev_hold(in_dev); |
522 | ||
523 | if (tb[IFA_ADDRESS] == NULL) | |
524 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 525 | |
1da177e4 LT |
526 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
527 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
528 | ifa->ifa_flags = ifm->ifa_flags; |
529 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
530 | ifa->ifa_dev = in_dev; |
531 | ||
a7a628c4 AV |
532 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
533 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
534 | |
535 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 536 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 | 537 | |
5c753978 TG |
538 | if (tb[IFA_LABEL]) |
539 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
540 | else |
541 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
542 | ||
5c753978 TG |
543 | return ifa; |
544 | ||
545 | errout: | |
546 | return ERR_PTR(err); | |
547 | } | |
548 | ||
549 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
550 | { | |
3b1e0a65 | 551 | struct net *net = sock_net(skb->sk); |
5c753978 TG |
552 | struct in_ifaddr *ifa; |
553 | ||
554 | ASSERT_RTNL(); | |
555 | ||
4b8aa9ab | 556 | ifa = rtm_to_ifaddr(net, nlh); |
5c753978 TG |
557 | if (IS_ERR(ifa)) |
558 | return PTR_ERR(ifa); | |
559 | ||
d6062cbb | 560 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
561 | } |
562 | ||
563 | /* | |
564 | * Determine a default network mask, based on the IP address. | |
565 | */ | |
566 | ||
714e85be | 567 | static __inline__ int inet_abc_len(__be32 addr) |
1da177e4 LT |
568 | { |
569 | int rc = -1; /* Something else, probably a multicast. */ | |
570 | ||
f97c1e0c | 571 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 572 | rc = 0; |
1da177e4 | 573 | else { |
714e85be | 574 | __u32 haddr = ntohl(addr); |
1da177e4 | 575 | |
714e85be | 576 | if (IN_CLASSA(haddr)) |
1da177e4 | 577 | rc = 8; |
714e85be | 578 | else if (IN_CLASSB(haddr)) |
1da177e4 | 579 | rc = 16; |
714e85be | 580 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
581 | rc = 24; |
582 | } | |
583 | ||
e905a9ed | 584 | return rc; |
1da177e4 LT |
585 | } |
586 | ||
587 | ||
e5b13cb1 | 588 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
589 | { |
590 | struct ifreq ifr; | |
591 | struct sockaddr_in sin_orig; | |
592 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
593 | struct in_device *in_dev; | |
594 | struct in_ifaddr **ifap = NULL; | |
595 | struct in_ifaddr *ifa = NULL; | |
596 | struct net_device *dev; | |
597 | char *colon; | |
598 | int ret = -EFAULT; | |
599 | int tryaddrmatch = 0; | |
600 | ||
601 | /* | |
602 | * Fetch the caller's info block into kernel space | |
603 | */ | |
604 | ||
605 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
606 | goto out; | |
607 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
608 | ||
609 | /* save original address for comparison */ | |
610 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
611 | ||
612 | colon = strchr(ifr.ifr_name, ':'); | |
613 | if (colon) | |
614 | *colon = 0; | |
615 | ||
616 | #ifdef CONFIG_KMOD | |
e5b13cb1 | 617 | dev_load(net, ifr.ifr_name); |
1da177e4 LT |
618 | #endif |
619 | ||
132adf54 | 620 | switch (cmd) { |
1da177e4 LT |
621 | case SIOCGIFADDR: /* Get interface address */ |
622 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
623 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
624 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
625 | /* Note that these ioctls will not sleep, | |
626 | so that we do not impose a lock. | |
627 | One day we will be forced to put shlock here (I mean SMP) | |
628 | */ | |
629 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
630 | memset(sin, 0, sizeof(*sin)); | |
631 | sin->sin_family = AF_INET; | |
632 | break; | |
633 | ||
634 | case SIOCSIFFLAGS: | |
635 | ret = -EACCES; | |
636 | if (!capable(CAP_NET_ADMIN)) | |
637 | goto out; | |
638 | break; | |
639 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
640 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
641 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
642 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
643 | ret = -EACCES; | |
644 | if (!capable(CAP_NET_ADMIN)) | |
645 | goto out; | |
646 | ret = -EINVAL; | |
647 | if (sin->sin_family != AF_INET) | |
648 | goto out; | |
649 | break; | |
650 | default: | |
651 | ret = -EINVAL; | |
652 | goto out; | |
653 | } | |
654 | ||
655 | rtnl_lock(); | |
656 | ||
657 | ret = -ENODEV; | |
e5b13cb1 | 658 | if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL) |
1da177e4 LT |
659 | goto done; |
660 | ||
661 | if (colon) | |
662 | *colon = ':'; | |
663 | ||
e5ed6399 | 664 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
665 | if (tryaddrmatch) { |
666 | /* Matthias Andree */ | |
667 | /* compare label and address (4.4BSD style) */ | |
668 | /* note: we only do this for a limited set of ioctls | |
669 | and only if the original address family was AF_INET. | |
670 | This is checked above. */ | |
671 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
672 | ifap = &ifa->ifa_next) { | |
673 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
674 | sin_orig.sin_addr.s_addr == | |
675 | ifa->ifa_address) { | |
676 | break; /* found */ | |
677 | } | |
678 | } | |
679 | } | |
680 | /* we didn't get a match, maybe the application is | |
681 | 4.3BSD-style and passed in junk so we fall back to | |
682 | comparing just the label */ | |
683 | if (!ifa) { | |
684 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
685 | ifap = &ifa->ifa_next) | |
686 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
687 | break; | |
688 | } | |
689 | } | |
690 | ||
691 | ret = -EADDRNOTAVAIL; | |
692 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
693 | goto done; | |
694 | ||
132adf54 | 695 | switch (cmd) { |
1da177e4 LT |
696 | case SIOCGIFADDR: /* Get interface address */ |
697 | sin->sin_addr.s_addr = ifa->ifa_local; | |
698 | goto rarok; | |
699 | ||
700 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
701 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
702 | goto rarok; | |
703 | ||
704 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
705 | sin->sin_addr.s_addr = ifa->ifa_address; | |
706 | goto rarok; | |
707 | ||
708 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
709 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
710 | goto rarok; | |
711 | ||
712 | case SIOCSIFFLAGS: | |
713 | if (colon) { | |
714 | ret = -EADDRNOTAVAIL; | |
715 | if (!ifa) | |
716 | break; | |
717 | ret = 0; | |
718 | if (!(ifr.ifr_flags & IFF_UP)) | |
719 | inet_del_ifa(in_dev, ifap, 1); | |
720 | break; | |
721 | } | |
722 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
723 | break; | |
724 | ||
725 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
726 | ret = -EINVAL; | |
727 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
728 | break; | |
729 | ||
730 | if (!ifa) { | |
731 | ret = -ENOBUFS; | |
732 | if ((ifa = inet_alloc_ifa()) == NULL) | |
733 | break; | |
734 | if (colon) | |
735 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
736 | else | |
737 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
738 | } else { | |
739 | ret = 0; | |
740 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
741 | break; | |
742 | inet_del_ifa(in_dev, ifap, 0); | |
743 | ifa->ifa_broadcast = 0; | |
148f9729 | 744 | ifa->ifa_scope = 0; |
1da177e4 LT |
745 | } |
746 | ||
747 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
748 | ||
749 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
750 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
751 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
752 | if ((dev->flags & IFF_BROADCAST) && | |
753 | ifa->ifa_prefixlen < 31) | |
754 | ifa->ifa_broadcast = ifa->ifa_address | | |
755 | ~ifa->ifa_mask; | |
756 | } else { | |
757 | ifa->ifa_prefixlen = 32; | |
758 | ifa->ifa_mask = inet_make_mask(32); | |
759 | } | |
760 | ret = inet_set_ifa(dev, ifa); | |
761 | break; | |
762 | ||
763 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
764 | ret = 0; | |
765 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
766 | inet_del_ifa(in_dev, ifap, 0); | |
767 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
768 | inet_insert_ifa(ifa); | |
769 | } | |
770 | break; | |
771 | ||
772 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
773 | ret = 0; | |
774 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
775 | break; | |
776 | ret = -EINVAL; | |
777 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
778 | break; | |
779 | ret = 0; | |
780 | inet_del_ifa(in_dev, ifap, 0); | |
781 | ifa->ifa_address = sin->sin_addr.s_addr; | |
782 | inet_insert_ifa(ifa); | |
783 | break; | |
784 | ||
785 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
786 | ||
787 | /* | |
788 | * The mask we set must be legal. | |
789 | */ | |
790 | ret = -EINVAL; | |
791 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
792 | break; | |
793 | ret = 0; | |
794 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 795 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
796 | inet_del_ifa(in_dev, ifap, 0); |
797 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
798 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
799 | ||
800 | /* See if current broadcast address matches | |
801 | * with current netmask, then recalculate | |
802 | * the broadcast address. Otherwise it's a | |
803 | * funny address, so don't touch it since | |
804 | * the user seems to know what (s)he's doing... | |
805 | */ | |
806 | if ((dev->flags & IFF_BROADCAST) && | |
807 | (ifa->ifa_prefixlen < 31) && | |
808 | (ifa->ifa_broadcast == | |
dcab5e1e | 809 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
810 | ifa->ifa_broadcast = (ifa->ifa_local | |
811 | ~sin->sin_addr.s_addr); | |
812 | } | |
813 | inet_insert_ifa(ifa); | |
814 | } | |
815 | break; | |
816 | } | |
817 | done: | |
818 | rtnl_unlock(); | |
819 | out: | |
820 | return ret; | |
821 | rarok: | |
822 | rtnl_unlock(); | |
823 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
824 | goto out; | |
825 | } | |
826 | ||
827 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
828 | { | |
e5ed6399 | 829 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
830 | struct in_ifaddr *ifa; |
831 | struct ifreq ifr; | |
832 | int done = 0; | |
833 | ||
834 | if (!in_dev || (ifa = in_dev->ifa_list) == NULL) | |
835 | goto out; | |
836 | ||
837 | for (; ifa; ifa = ifa->ifa_next) { | |
838 | if (!buf) { | |
839 | done += sizeof(ifr); | |
840 | continue; | |
841 | } | |
842 | if (len < (int) sizeof(ifr)) | |
843 | break; | |
844 | memset(&ifr, 0, sizeof(struct ifreq)); | |
845 | if (ifa->ifa_label) | |
846 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
847 | else | |
848 | strcpy(ifr.ifr_name, dev->name); | |
849 | ||
850 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
851 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
852 | ifa->ifa_local; | |
853 | ||
854 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
855 | done = -EFAULT; | |
856 | break; | |
857 | } | |
858 | buf += sizeof(struct ifreq); | |
859 | len -= sizeof(struct ifreq); | |
860 | done += sizeof(struct ifreq); | |
861 | } | |
862 | out: | |
863 | return done; | |
864 | } | |
865 | ||
a61ced5d | 866 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 867 | { |
a61ced5d | 868 | __be32 addr = 0; |
1da177e4 | 869 | struct in_device *in_dev; |
c346dca1 | 870 | struct net *net = dev_net(dev); |
1da177e4 LT |
871 | |
872 | rcu_read_lock(); | |
e5ed6399 | 873 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
874 | if (!in_dev) |
875 | goto no_in_dev; | |
876 | ||
877 | for_primary_ifa(in_dev) { | |
878 | if (ifa->ifa_scope > scope) | |
879 | continue; | |
880 | if (!dst || inet_ifa_match(dst, ifa)) { | |
881 | addr = ifa->ifa_local; | |
882 | break; | |
883 | } | |
884 | if (!addr) | |
885 | addr = ifa->ifa_local; | |
886 | } endfor_ifa(in_dev); | |
887 | no_in_dev: | |
888 | rcu_read_unlock(); | |
889 | ||
890 | if (addr) | |
891 | goto out; | |
892 | ||
893 | /* Not loopback addresses on loopback should be preferred | |
894 | in this case. It is importnat that lo is the first interface | |
895 | in dev_base list. | |
896 | */ | |
897 | read_lock(&dev_base_lock); | |
898 | rcu_read_lock(); | |
c4544c72 | 899 | for_each_netdev(net, dev) { |
e5ed6399 | 900 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) |
1da177e4 LT |
901 | continue; |
902 | ||
903 | for_primary_ifa(in_dev) { | |
904 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
905 | ifa->ifa_scope <= scope) { | |
906 | addr = ifa->ifa_local; | |
907 | goto out_unlock_both; | |
908 | } | |
909 | } endfor_ifa(in_dev); | |
910 | } | |
911 | out_unlock_both: | |
912 | read_unlock(&dev_base_lock); | |
913 | rcu_read_unlock(); | |
914 | out: | |
915 | return addr; | |
916 | } | |
917 | ||
60cad5da AV |
918 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
919 | __be32 local, int scope) | |
1da177e4 LT |
920 | { |
921 | int same = 0; | |
a144ea4b | 922 | __be32 addr = 0; |
1da177e4 LT |
923 | |
924 | for_ifa(in_dev) { | |
925 | if (!addr && | |
926 | (local == ifa->ifa_local || !local) && | |
927 | ifa->ifa_scope <= scope) { | |
928 | addr = ifa->ifa_local; | |
929 | if (same) | |
930 | break; | |
931 | } | |
932 | if (!same) { | |
933 | same = (!local || inet_ifa_match(local, ifa)) && | |
934 | (!dst || inet_ifa_match(dst, ifa)); | |
935 | if (same && addr) { | |
936 | if (local || !dst) | |
937 | break; | |
938 | /* Is the selected addr into dst subnet? */ | |
939 | if (inet_ifa_match(addr, ifa)) | |
940 | break; | |
941 | /* No, then can we use new local src? */ | |
942 | if (ifa->ifa_scope <= scope) { | |
943 | addr = ifa->ifa_local; | |
944 | break; | |
945 | } | |
946 | /* search for large dst subnet for addr */ | |
947 | same = 0; | |
948 | } | |
949 | } | |
950 | } endfor_ifa(in_dev); | |
951 | ||
952 | return same? addr : 0; | |
953 | } | |
954 | ||
955 | /* | |
956 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 957 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
958 | * - dst: only in the same subnet as dst, 0=any dst |
959 | * - local: address, 0=autoselect the local address | |
960 | * - scope: maximum allowed scope value for the local address | |
961 | */ | |
9bd85e32 DL |
962 | __be32 inet_confirm_addr(struct in_device *in_dev, |
963 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 964 | { |
60cad5da | 965 | __be32 addr = 0; |
9bd85e32 | 966 | struct net_device *dev; |
39a6d063 | 967 | struct net *net; |
1da177e4 | 968 | |
39a6d063 | 969 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 970 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 971 | |
c346dca1 | 972 | net = dev_net(in_dev->dev); |
1da177e4 LT |
973 | read_lock(&dev_base_lock); |
974 | rcu_read_lock(); | |
39a6d063 | 975 | for_each_netdev(net, dev) { |
e5ed6399 | 976 | if ((in_dev = __in_dev_get_rcu(dev))) { |
1da177e4 LT |
977 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
978 | if (addr) | |
979 | break; | |
980 | } | |
981 | } | |
982 | rcu_read_unlock(); | |
983 | read_unlock(&dev_base_lock); | |
984 | ||
985 | return addr; | |
986 | } | |
987 | ||
988 | /* | |
989 | * Device notifier | |
990 | */ | |
991 | ||
992 | int register_inetaddr_notifier(struct notifier_block *nb) | |
993 | { | |
e041c683 | 994 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 LT |
995 | } |
996 | ||
997 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
998 | { | |
e041c683 | 999 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 LT |
1000 | } |
1001 | ||
1002 | /* Rename ifa_labels for a device name change. Make some effort to preserve existing | |
1003 | * alias numbering and to create unique labels if possible. | |
1004 | */ | |
1005 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1006 | { |
1da177e4 LT |
1007 | struct in_ifaddr *ifa; |
1008 | int named = 0; | |
1009 | ||
e905a9ed YH |
1010 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1011 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1012 | |
1013 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1014 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1015 | if (named++ == 0) |
573bf470 | 1016 | goto skip; |
44344b2a | 1017 | dot = strchr(old, ':'); |
e905a9ed YH |
1018 | if (dot == NULL) { |
1019 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1020 | dot = old; |
1021 | } | |
e905a9ed YH |
1022 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { |
1023 | strcat(ifa->ifa_label, dot); | |
1024 | } else { | |
1025 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
1026 | } | |
573bf470 TG |
1027 | skip: |
1028 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1029 | } |
1030 | } | |
1da177e4 LT |
1031 | |
1032 | /* Called only under RTNL semaphore */ | |
1033 | ||
1034 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1035 | void *ptr) | |
1036 | { | |
1037 | struct net_device *dev = ptr; | |
e5ed6399 | 1038 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1039 | |
1040 | ASSERT_RTNL(); | |
1041 | ||
1042 | if (!in_dev) { | |
8030f544 | 1043 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1044 | in_dev = inetdev_init(dev); |
b217d616 HX |
1045 | if (!in_dev) |
1046 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1047 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1048 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1049 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1050 | } |
1da177e4 LT |
1051 | } |
1052 | goto out; | |
1053 | } | |
1054 | ||
1055 | switch (event) { | |
1056 | case NETDEV_REGISTER: | |
1057 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1058 | dev->ip_ptr = NULL; | |
1059 | break; | |
1060 | case NETDEV_UP: | |
1061 | if (dev->mtu < 68) | |
1062 | break; | |
0cc217e1 | 1063 | if (dev->flags & IFF_LOOPBACK) { |
1da177e4 LT |
1064 | struct in_ifaddr *ifa; |
1065 | if ((ifa = inet_alloc_ifa()) != NULL) { | |
1066 | ifa->ifa_local = | |
1067 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1068 | ifa->ifa_prefixlen = 8; | |
1069 | ifa->ifa_mask = inet_make_mask(8); | |
1070 | in_dev_hold(in_dev); | |
1071 | ifa->ifa_dev = in_dev; | |
1072 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1073 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1074 | inet_insert_ifa(ifa); | |
1075 | } | |
1076 | } | |
1077 | ip_mc_up(in_dev); | |
1078 | break; | |
1079 | case NETDEV_DOWN: | |
1080 | ip_mc_down(in_dev); | |
1081 | break; | |
1082 | case NETDEV_CHANGEMTU: | |
1083 | if (dev->mtu >= 68) | |
1084 | break; | |
1085 | /* MTU falled under 68, disable IP */ | |
1086 | case NETDEV_UNREGISTER: | |
1087 | inetdev_destroy(in_dev); | |
1088 | break; | |
1089 | case NETDEV_CHANGENAME: | |
1090 | /* Do not notify about label change, this event is | |
1091 | * not interesting to applications using netlink. | |
1092 | */ | |
1093 | inetdev_changename(dev, in_dev); | |
1094 | ||
51602b2a | 1095 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1096 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1097 | break; |
1098 | } | |
1099 | out: | |
1100 | return NOTIFY_DONE; | |
1101 | } | |
1102 | ||
1103 | static struct notifier_block ip_netdev_notifier = { | |
1104 | .notifier_call =inetdev_event, | |
1105 | }; | |
1106 | ||
339bf98f TG |
1107 | static inline size_t inet_nlmsg_size(void) |
1108 | { | |
1109 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1110 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1111 | + nla_total_size(4) /* IFA_LOCAL */ | |
1112 | + nla_total_size(4) /* IFA_BROADCAST */ | |
339bf98f TG |
1113 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ |
1114 | } | |
1115 | ||
1da177e4 | 1116 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1117 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1118 | { |
1119 | struct ifaddrmsg *ifm; | |
1120 | struct nlmsghdr *nlh; | |
1da177e4 | 1121 | |
47f68512 TG |
1122 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1123 | if (nlh == NULL) | |
26932566 | 1124 | return -EMSGSIZE; |
47f68512 TG |
1125 | |
1126 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1127 | ifm->ifa_family = AF_INET; |
1128 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1129 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1130 | ifm->ifa_scope = ifa->ifa_scope; | |
1131 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1132 | |
1da177e4 | 1133 | if (ifa->ifa_address) |
a7a628c4 | 1134 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1135 | |
1da177e4 | 1136 | if (ifa->ifa_local) |
a7a628c4 | 1137 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1138 | |
1da177e4 | 1139 | if (ifa->ifa_broadcast) |
a7a628c4 | 1140 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1141 | |
1da177e4 | 1142 | if (ifa->ifa_label[0]) |
47f68512 | 1143 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1144 | |
47f68512 TG |
1145 | return nlmsg_end(skb, nlh); |
1146 | ||
1147 | nla_put_failure: | |
26932566 PM |
1148 | nlmsg_cancel(skb, nlh); |
1149 | return -EMSGSIZE; | |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1153 | { | |
3b1e0a65 | 1154 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1155 | int idx, ip_idx; |
1156 | struct net_device *dev; | |
1157 | struct in_device *in_dev; | |
1158 | struct in_ifaddr *ifa; | |
1159 | int s_ip_idx, s_idx = cb->args[0]; | |
1160 | ||
1161 | s_ip_idx = ip_idx = cb->args[1]; | |
7562f876 | 1162 | idx = 0; |
4b8aa9ab | 1163 | for_each_netdev(net, dev) { |
1da177e4 | 1164 | if (idx < s_idx) |
7562f876 | 1165 | goto cont; |
1da177e4 LT |
1166 | if (idx > s_idx) |
1167 | s_ip_idx = 0; | |
6313c1e0 | 1168 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
7562f876 | 1169 | goto cont; |
1da177e4 LT |
1170 | |
1171 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1172 | ifa = ifa->ifa_next, ip_idx++) { | |
1173 | if (ip_idx < s_ip_idx) | |
596e4150 | 1174 | continue; |
1da177e4 LT |
1175 | if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, |
1176 | cb->nlh->nlmsg_seq, | |
6313c1e0 | 1177 | RTM_NEWADDR, NLM_F_MULTI) <= 0) |
1da177e4 | 1178 | goto done; |
1da177e4 | 1179 | } |
7562f876 PE |
1180 | cont: |
1181 | idx++; | |
1da177e4 LT |
1182 | } |
1183 | ||
1184 | done: | |
1da177e4 LT |
1185 | cb->args[0] = idx; |
1186 | cb->args[1] = ip_idx; | |
1187 | ||
1188 | return skb->len; | |
1189 | } | |
1190 | ||
d6062cbb TG |
1191 | static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh, |
1192 | u32 pid) | |
1da177e4 | 1193 | { |
47f68512 | 1194 | struct sk_buff *skb; |
d6062cbb TG |
1195 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1196 | int err = -ENOBUFS; | |
4b8aa9ab | 1197 | struct net *net; |
1da177e4 | 1198 | |
c346dca1 | 1199 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1200 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1201 | if (skb == NULL) |
d6062cbb TG |
1202 | goto errout; |
1203 | ||
1204 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1205 | if (err < 0) { |
1206 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1207 | WARN_ON(err == -EMSGSIZE); | |
1208 | kfree_skb(skb); | |
1209 | goto errout; | |
1210 | } | |
4b8aa9ab | 1211 | err = rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
d6062cbb TG |
1212 | errout: |
1213 | if (err < 0) | |
4b8aa9ab | 1214 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1215 | } |
1216 | ||
1da177e4 LT |
1217 | #ifdef CONFIG_SYSCTL |
1218 | ||
c0ce9fb3 | 1219 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1220 | { |
1221 | struct net_device *dev; | |
1222 | ||
1223 | read_lock(&dev_base_lock); | |
c0ce9fb3 | 1224 | for_each_netdev(net, dev) { |
31be3085 HX |
1225 | struct in_device *in_dev; |
1226 | rcu_read_lock(); | |
1227 | in_dev = __in_dev_get_rcu(dev); | |
1228 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1229 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 HX |
1230 | rcu_read_unlock(); |
1231 | } | |
1232 | read_unlock(&dev_base_lock); | |
1233 | } | |
1234 | ||
c0ce9fb3 | 1235 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1236 | { |
1237 | struct net_device *dev; | |
586f1211 | 1238 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1239 | |
586f1211 | 1240 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1241 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
68dd299b PE |
1242 | |
1243 | read_lock(&dev_base_lock); | |
c0ce9fb3 | 1244 | for_each_netdev(net, dev) { |
68dd299b | 1245 | struct in_device *in_dev; |
0187bdfb BH |
1246 | if (on) |
1247 | dev_disable_lro(dev); | |
68dd299b PE |
1248 | rcu_read_lock(); |
1249 | in_dev = __in_dev_get_rcu(dev); | |
1250 | if (in_dev) | |
1251 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1252 | rcu_read_unlock(); | |
1253 | } | |
1254 | read_unlock(&dev_base_lock); | |
68dd299b PE |
1255 | } |
1256 | ||
31be3085 HX |
1257 | static int devinet_conf_proc(ctl_table *ctl, int write, |
1258 | struct file* filp, void __user *buffer, | |
1259 | size_t *lenp, loff_t *ppos) | |
1260 | { | |
1261 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1262 | ||
1263 | if (write) { | |
1264 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1265 | struct net *net = ctl->extra2; |
31be3085 HX |
1266 | int i = (int *)ctl->data - cnf->data; |
1267 | ||
1268 | set_bit(i, cnf->state); | |
1269 | ||
9355bbd6 | 1270 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1271 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1272 | } |
1273 | ||
1274 | return ret; | |
1275 | } | |
1276 | ||
1277 | static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen, | |
1278 | void __user *oldval, size_t __user *oldlenp, | |
1279 | void __user *newval, size_t newlen) | |
1280 | { | |
1281 | struct ipv4_devconf *cnf; | |
c0ce9fb3 | 1282 | struct net *net; |
31be3085 HX |
1283 | int *valp = table->data; |
1284 | int new; | |
1285 | int i; | |
1286 | ||
1287 | if (!newval || !newlen) | |
1288 | return 0; | |
1289 | ||
1290 | if (newlen != sizeof(int)) | |
1291 | return -EINVAL; | |
1292 | ||
1293 | if (get_user(new, (int __user *)newval)) | |
1294 | return -EFAULT; | |
1295 | ||
1296 | if (new == *valp) | |
1297 | return 0; | |
1298 | ||
1299 | if (oldval && oldlenp) { | |
1300 | size_t len; | |
1301 | ||
1302 | if (get_user(len, oldlenp)) | |
1303 | return -EFAULT; | |
1304 | ||
1305 | if (len) { | |
1306 | if (len > table->maxlen) | |
1307 | len = table->maxlen; | |
1308 | if (copy_to_user(oldval, valp, len)) | |
1309 | return -EFAULT; | |
1310 | if (put_user(len, oldlenp)) | |
1311 | return -EFAULT; | |
1312 | } | |
1313 | } | |
1314 | ||
1315 | *valp = new; | |
1316 | ||
1317 | cnf = table->extra1; | |
c0ce9fb3 | 1318 | net = table->extra2; |
31be3085 HX |
1319 | i = (int *)table->data - cnf->data; |
1320 | ||
1321 | set_bit(i, cnf->state); | |
1322 | ||
9355bbd6 | 1323 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1324 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1325 | |
1326 | return 1; | |
1327 | } | |
1328 | ||
1da177e4 LT |
1329 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
1330 | struct file* filp, void __user *buffer, | |
1331 | size_t *lenp, loff_t *ppos) | |
1332 | { | |
1333 | int *valp = ctl->data; | |
1334 | int val = *valp; | |
1335 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1336 | ||
1337 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1338 | struct net *net = ctl->extra2; |
1339 | ||
0187bdfb BH |
1340 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
1341 | rtnl_lock(); | |
1342 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { | |
1343 | inet_forward_change(net); | |
1344 | } else if (*valp) { | |
1345 | struct ipv4_devconf *cnf = ctl->extra1; | |
1346 | struct in_device *idev = | |
1347 | container_of(cnf, struct in_device, cnf); | |
1348 | dev_disable_lro(idev->dev); | |
1349 | } | |
1350 | rtnl_unlock(); | |
76e6ebfb | 1351 | rt_cache_flush(net, 0); |
0187bdfb | 1352 | } |
1da177e4 LT |
1353 | } |
1354 | ||
1355 | return ret; | |
1356 | } | |
1357 | ||
1358 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
1359 | struct file* filp, void __user *buffer, | |
1360 | size_t *lenp, loff_t *ppos) | |
1361 | { | |
1362 | int *valp = ctl->data; | |
1363 | int val = *valp; | |
1364 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
76e6ebfb | 1365 | struct net *net = ctl->extra2; |
1da177e4 LT |
1366 | |
1367 | if (write && *valp != val) | |
76e6ebfb | 1368 | rt_cache_flush(net, 0); |
1da177e4 LT |
1369 | |
1370 | return ret; | |
1371 | } | |
1372 | ||
1373 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
1374 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 1375 | void __user *newval, size_t newlen) |
1da177e4 | 1376 | { |
31be3085 HX |
1377 | int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp, |
1378 | newval, newlen); | |
76e6ebfb | 1379 | struct net *net = table->extra2; |
1da177e4 | 1380 | |
31be3085 | 1381 | if (ret == 1) |
76e6ebfb | 1382 | rt_cache_flush(net, 0); |
1da177e4 | 1383 | |
31be3085 | 1384 | return ret; |
1da177e4 LT |
1385 | } |
1386 | ||
1387 | ||
42f811b8 HX |
1388 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \ |
1389 | { \ | |
1390 | .ctl_name = NET_IPV4_CONF_ ## attr, \ | |
1391 | .procname = name, \ | |
1392 | .data = ipv4_devconf.data + \ | |
1393 | NET_IPV4_CONF_ ## attr - 1, \ | |
1394 | .maxlen = sizeof(int), \ | |
1395 | .mode = mval, \ | |
1396 | .proc_handler = proc, \ | |
1397 | .strategy = sysctl, \ | |
31be3085 | 1398 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1399 | } |
1400 | ||
1401 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
31be3085 HX |
1402 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \ |
1403 | devinet_conf_sysctl) | |
42f811b8 HX |
1404 | |
1405 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
31be3085 HX |
1406 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \ |
1407 | devinet_conf_sysctl) | |
42f811b8 HX |
1408 | |
1409 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \ | |
1410 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl) | |
1411 | ||
1412 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
1413 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \ | |
1414 | ipv4_doint_and_flush_strategy) | |
1415 | ||
1da177e4 LT |
1416 | static struct devinet_sysctl_table { |
1417 | struct ctl_table_header *sysctl_header; | |
bfada697 PE |
1418 | struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; |
1419 | char *dev_name; | |
1da177e4 LT |
1420 | } devinet_sysctl = { |
1421 | .devinet_vars = { | |
42f811b8 | 1422 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
31be3085 HX |
1423 | devinet_sysctl_forward, |
1424 | devinet_conf_sysctl), | |
42f811b8 HX |
1425 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1426 | ||
1427 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1428 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1429 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1430 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1431 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1432 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1433 | "accept_source_route"), | |
1434 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), | |
1435 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1436 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1437 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1438 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1439 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1440 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1441 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1442 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
1443 | ||
1444 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1445 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1446 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1447 | "force_igmp_version"), | |
1448 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1449 | "promote_secondaries"), | |
1da177e4 | 1450 | }, |
1da177e4 LT |
1451 | }; |
1452 | ||
ea40b324 PE |
1453 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
1454 | int ctl_name, struct ipv4_devconf *p) | |
1da177e4 LT |
1455 | { |
1456 | int i; | |
9fa89642 | 1457 | struct devinet_sysctl_table *t; |
1da177e4 | 1458 | |
bfada697 PE |
1459 | #define DEVINET_CTL_PATH_DEV 3 |
1460 | ||
1461 | struct ctl_path devinet_ctl_path[] = { | |
1462 | { .procname = "net", .ctl_name = CTL_NET, }, | |
1463 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1464 | { .procname = "conf", .ctl_name = NET_IPV4_CONF, }, | |
1465 | { /* to be set */ }, | |
1466 | { }, | |
1467 | }; | |
1468 | ||
9fa89642 | 1469 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1470 | if (!t) |
9fa89642 PE |
1471 | goto out; |
1472 | ||
1da177e4 LT |
1473 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1474 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1475 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1476 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1477 | } |
1478 | ||
e905a9ed YH |
1479 | /* |
1480 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1481 | * by sysctl and we wouldn't want anyone to change it under our feet |
1482 | * (see SIOCSIFNAME). | |
e905a9ed | 1483 | */ |
bfada697 PE |
1484 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1485 | if (!t->dev_name) | |
9fa89642 | 1486 | goto free; |
1da177e4 | 1487 | |
bfada697 PE |
1488 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1489 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name; | |
1da177e4 | 1490 | |
752d14dc | 1491 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, |
bfada697 | 1492 | t->devinet_vars); |
1da177e4 | 1493 | if (!t->sysctl_header) |
9fa89642 | 1494 | goto free_procname; |
1da177e4 LT |
1495 | |
1496 | p->sysctl = t; | |
ea40b324 | 1497 | return 0; |
1da177e4 | 1498 | |
9fa89642 | 1499 | free_procname: |
bfada697 | 1500 | kfree(t->dev_name); |
9fa89642 | 1501 | free: |
1da177e4 | 1502 | kfree(t); |
9fa89642 | 1503 | out: |
ea40b324 | 1504 | return -ENOBUFS; |
1da177e4 LT |
1505 | } |
1506 | ||
51602b2a PE |
1507 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1508 | { | |
1509 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1510 | ||
1511 | if (t == NULL) | |
1512 | return; | |
1513 | ||
1514 | cnf->sysctl = NULL; | |
1515 | unregister_sysctl_table(t->sysctl_header); | |
1516 | kfree(t->dev_name); | |
1517 | kfree(t); | |
1518 | } | |
1519 | ||
66f27a52 PE |
1520 | static void devinet_sysctl_register(struct in_device *idev) |
1521 | { | |
51602b2a PE |
1522 | neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4, |
1523 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
c346dca1 | 1524 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, |
c0ce9fb3 | 1525 | idev->dev->ifindex, &idev->cnf); |
66f27a52 PE |
1526 | } |
1527 | ||
51602b2a | 1528 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1529 | { |
51602b2a PE |
1530 | __devinet_sysctl_unregister(&idev->cnf); |
1531 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 1532 | } |
1da177e4 | 1533 | |
68dd299b PE |
1534 | static struct ctl_table ctl_forward_entry[] = { |
1535 | { | |
1536 | .ctl_name = NET_IPV4_FORWARD, | |
1537 | .procname = "ip_forward", | |
1538 | .data = &ipv4_devconf.data[ | |
1539 | NET_IPV4_CONF_FORWARDING - 1], | |
1540 | .maxlen = sizeof(int), | |
1541 | .mode = 0644, | |
1542 | .proc_handler = devinet_sysctl_forward, | |
1543 | .strategy = devinet_conf_sysctl, | |
1544 | .extra1 = &ipv4_devconf, | |
c0ce9fb3 | 1545 | .extra2 = &init_net, |
68dd299b PE |
1546 | }, |
1547 | { }, | |
1548 | }; | |
1549 | ||
752d14dc | 1550 | static __net_initdata struct ctl_path net_ipv4_path[] = { |
68dd299b PE |
1551 | { .procname = "net", .ctl_name = CTL_NET, }, |
1552 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1553 | { }, | |
1554 | }; | |
2a75de0c | 1555 | #endif |
68dd299b | 1556 | |
752d14dc PE |
1557 | static __net_init int devinet_init_net(struct net *net) |
1558 | { | |
1559 | int err; | |
752d14dc | 1560 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
1561 | #ifdef CONFIG_SYSCTL |
1562 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 1563 | struct ctl_table_header *forw_hdr; |
2a75de0c | 1564 | #endif |
752d14dc PE |
1565 | |
1566 | err = -ENOMEM; | |
1567 | all = &ipv4_devconf; | |
1568 | dflt = &ipv4_devconf_dflt; | |
752d14dc PE |
1569 | |
1570 | if (net != &init_net) { | |
1571 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); | |
1572 | if (all == NULL) | |
1573 | goto err_alloc_all; | |
1574 | ||
1575 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1576 | if (dflt == NULL) | |
1577 | goto err_alloc_dflt; | |
1578 | ||
2a75de0c | 1579 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1580 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
1581 | if (tbl == NULL) | |
1582 | goto err_alloc_ctl; | |
1583 | ||
1584 | tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1]; | |
1585 | tbl[0].extra1 = all; | |
1586 | tbl[0].extra2 = net; | |
2a75de0c | 1587 | #endif |
752d14dc PE |
1588 | } |
1589 | ||
1590 | #ifdef CONFIG_SYSCTL | |
1591 | err = __devinet_sysctl_register(net, "all", | |
1592 | NET_PROTO_CONF_ALL, all); | |
1593 | if (err < 0) | |
1594 | goto err_reg_all; | |
1595 | ||
1596 | err = __devinet_sysctl_register(net, "default", | |
1597 | NET_PROTO_CONF_DEFAULT, dflt); | |
1598 | if (err < 0) | |
1599 | goto err_reg_dflt; | |
1600 | ||
1601 | err = -ENOMEM; | |
1602 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1603 | if (forw_hdr == NULL) | |
1604 | goto err_reg_ctl; | |
2a75de0c | 1605 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
1606 | #endif |
1607 | ||
752d14dc PE |
1608 | net->ipv4.devconf_all = all; |
1609 | net->ipv4.devconf_dflt = dflt; | |
1610 | return 0; | |
1611 | ||
1612 | #ifdef CONFIG_SYSCTL | |
1613 | err_reg_ctl: | |
1614 | __devinet_sysctl_unregister(dflt); | |
1615 | err_reg_dflt: | |
1616 | __devinet_sysctl_unregister(all); | |
1617 | err_reg_all: | |
1618 | if (tbl != ctl_forward_entry) | |
1619 | kfree(tbl); | |
752d14dc | 1620 | err_alloc_ctl: |
2a75de0c | 1621 | #endif |
752d14dc PE |
1622 | if (dflt != &ipv4_devconf_dflt) |
1623 | kfree(dflt); | |
1624 | err_alloc_dflt: | |
1625 | if (all != &ipv4_devconf) | |
1626 | kfree(all); | |
1627 | err_alloc_all: | |
1628 | return err; | |
1629 | } | |
1630 | ||
1631 | static __net_exit void devinet_exit_net(struct net *net) | |
1632 | { | |
2a75de0c | 1633 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1634 | struct ctl_table *tbl; |
1635 | ||
1636 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
1637 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
1638 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1639 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 1640 | kfree(tbl); |
2a75de0c | 1641 | #endif |
752d14dc PE |
1642 | kfree(net->ipv4.devconf_dflt); |
1643 | kfree(net->ipv4.devconf_all); | |
1644 | } | |
1645 | ||
1646 | static __net_initdata struct pernet_operations devinet_ops = { | |
1647 | .init = devinet_init_net, | |
1648 | .exit = devinet_exit_net, | |
1649 | }; | |
1650 | ||
1da177e4 LT |
1651 | void __init devinet_init(void) |
1652 | { | |
752d14dc PE |
1653 | register_pernet_subsys(&devinet_ops); |
1654 | ||
1da177e4 LT |
1655 | register_gifconf(PF_INET, inet_gifconf); |
1656 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f TG |
1657 | |
1658 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1659 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1660 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 LT |
1661 | } |
1662 | ||
1da177e4 LT |
1663 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1664 | EXPORT_SYMBOL(inet_select_addr); | |
1665 | EXPORT_SYMBOL(inetdev_by_index); | |
1666 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
1667 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |