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 | { | |
93adcc80 | 115 | return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); |
1da177e4 LT |
116 | } |
117 | ||
118 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
119 | { | |
120 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
121 | if (ifa->ifa_dev) | |
122 | in_dev_put(ifa->ifa_dev); | |
123 | kfree(ifa); | |
124 | } | |
125 | ||
126 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
127 | { | |
128 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
129 | } | |
130 | ||
131 | void in_dev_finish_destroy(struct in_device *idev) | |
132 | { | |
133 | struct net_device *dev = idev->dev; | |
134 | ||
547b792c IJ |
135 | WARN_ON(idev->ifa_list); |
136 | WARN_ON(idev->mc_list); | |
1da177e4 LT |
137 | #ifdef NET_REFCNT_DEBUG |
138 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
139 | idev, dev ? dev->name : "NIL"); | |
140 | #endif | |
141 | dev_put(dev); | |
142 | if (!idev->dead) | |
143 | printk("Freeing alive in_device %p\n", idev); | |
144 | else { | |
145 | kfree(idev); | |
146 | } | |
147 | } | |
148 | ||
71e27da9 | 149 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
150 | { |
151 | struct in_device *in_dev; | |
152 | ||
153 | ASSERT_RTNL(); | |
154 | ||
0da974f4 | 155 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
156 | if (!in_dev) |
157 | goto out; | |
c346dca1 | 158 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 159 | sizeof(in_dev->cnf)); |
1da177e4 LT |
160 | in_dev->cnf.sysctl = NULL; |
161 | in_dev->dev = dev; | |
162 | if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) | |
163 | goto out_kfree; | |
0187bdfb BH |
164 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
165 | dev_disable_lro(dev); | |
1da177e4 LT |
166 | /* Reference in_dev->dev */ |
167 | dev_hold(dev); | |
30c4cf57 | 168 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 169 | in_dev_hold(in_dev); |
1da177e4 | 170 | |
66f27a52 | 171 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
172 | ip_mc_init_dev(in_dev); |
173 | if (dev->flags & IFF_UP) | |
174 | ip_mc_up(in_dev); | |
483479ec | 175 | |
30c4cf57 DS |
176 | /* we can receive as soon as ip_ptr is set -- do this last */ |
177 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 178 | out: |
1da177e4 LT |
179 | return in_dev; |
180 | out_kfree: | |
181 | kfree(in_dev); | |
182 | in_dev = NULL; | |
183 | goto out; | |
184 | } | |
185 | ||
186 | static void in_dev_rcu_put(struct rcu_head *head) | |
187 | { | |
188 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
189 | in_dev_put(idev); | |
190 | } | |
191 | ||
192 | static void inetdev_destroy(struct in_device *in_dev) | |
193 | { | |
194 | struct in_ifaddr *ifa; | |
195 | struct net_device *dev; | |
196 | ||
197 | ASSERT_RTNL(); | |
198 | ||
199 | dev = in_dev->dev; | |
1da177e4 LT |
200 | |
201 | in_dev->dead = 1; | |
202 | ||
203 | ip_mc_destroy_dev(in_dev); | |
204 | ||
205 | while ((ifa = in_dev->ifa_list) != NULL) { | |
206 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
207 | inet_free_ifa(ifa); | |
208 | } | |
209 | ||
1da177e4 LT |
210 | dev->ip_ptr = NULL; |
211 | ||
51602b2a | 212 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
213 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
214 | arp_ifdown(dev); | |
215 | ||
216 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
217 | } | |
218 | ||
ff428d72 | 219 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
220 | { |
221 | rcu_read_lock(); | |
222 | for_primary_ifa(in_dev) { | |
223 | if (inet_ifa_match(a, ifa)) { | |
224 | if (!b || inet_ifa_match(b, ifa)) { | |
225 | rcu_read_unlock(); | |
226 | return 1; | |
227 | } | |
228 | } | |
229 | } endfor_ifa(in_dev); | |
230 | rcu_read_unlock(); | |
231 | return 0; | |
232 | } | |
233 | ||
d6062cbb TG |
234 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
235 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 236 | { |
8f937c60 | 237 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
238 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
239 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
240 | struct in_ifaddr *prev_prom = NULL; | |
241 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
242 | |
243 | ASSERT_RTNL(); | |
244 | ||
e905a9ed | 245 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
246 | * unless alias promotion is set |
247 | **/ | |
1da177e4 LT |
248 | |
249 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
250 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
251 | ||
252 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 253 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
254 | ifa1->ifa_scope <= ifa->ifa_scope) |
255 | last_prim = ifa; | |
256 | ||
1da177e4 LT |
257 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
258 | ifa1->ifa_mask != ifa->ifa_mask || | |
259 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
260 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 261 | prev_prom = ifa; |
1da177e4 LT |
262 | continue; |
263 | } | |
264 | ||
0ff60a45 | 265 | if (!do_promote) { |
8f937c60 | 266 | *ifap1 = ifa->ifa_next; |
1da177e4 | 267 | |
d6062cbb | 268 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
269 | blocking_notifier_call_chain(&inetaddr_chain, |
270 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
271 | inet_free_ifa(ifa); |
272 | } else { | |
273 | promote = ifa; | |
274 | break; | |
275 | } | |
1da177e4 LT |
276 | } |
277 | } | |
278 | ||
279 | /* 2. Unlink it */ | |
280 | ||
281 | *ifap = ifa1->ifa_next; | |
282 | ||
283 | /* 3. Announce address deletion */ | |
284 | ||
285 | /* Send message first, then call notifier. | |
286 | At first sight, FIB update triggered by notifier | |
287 | will refer to already deleted ifaddr, that could confuse | |
288 | netlink listeners. It is not true: look, gated sees | |
289 | that route deleted and if it still thinks that ifaddr | |
290 | is valid, it will try to restore deleted routes... Grr. | |
291 | So that, this order is correct. | |
292 | */ | |
d6062cbb | 293 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 294 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 295 | |
0ff60a45 JHS |
296 | if (promote) { |
297 | ||
298 | if (prev_prom) { | |
299 | prev_prom->ifa_next = promote->ifa_next; | |
300 | promote->ifa_next = last_prim->ifa_next; | |
301 | last_prim->ifa_next = promote; | |
302 | } | |
8f937c60 | 303 | |
8f937c60 | 304 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 305 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
306 | blocking_notifier_call_chain(&inetaddr_chain, |
307 | NETDEV_UP, promote); | |
0ff60a45 JHS |
308 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
309 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
310 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
311 | continue; | |
312 | fib_add_ifaddr(ifa); | |
313 | } | |
314 | ||
315 | } | |
6363097c | 316 | if (destroy) |
0ff60a45 | 317 | inet_free_ifa(ifa1); |
1da177e4 LT |
318 | } |
319 | ||
d6062cbb TG |
320 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
321 | int destroy) | |
322 | { | |
323 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
324 | } | |
325 | ||
326 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
327 | u32 pid) | |
1da177e4 LT |
328 | { |
329 | struct in_device *in_dev = ifa->ifa_dev; | |
330 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
331 | ||
332 | ASSERT_RTNL(); | |
333 | ||
334 | if (!ifa->ifa_local) { | |
335 | inet_free_ifa(ifa); | |
336 | return 0; | |
337 | } | |
338 | ||
339 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
340 | last_primary = &in_dev->ifa_list; | |
341 | ||
342 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
343 | ifap = &ifa1->ifa_next) { | |
344 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
345 | ifa->ifa_scope <= ifa1->ifa_scope) | |
346 | last_primary = &ifa1->ifa_next; | |
347 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
348 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
349 | if (ifa1->ifa_local == ifa->ifa_local) { | |
350 | inet_free_ifa(ifa); | |
351 | return -EEXIST; | |
352 | } | |
353 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
354 | inet_free_ifa(ifa); | |
355 | return -EINVAL; | |
356 | } | |
357 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
358 | } | |
359 | } | |
360 | ||
361 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
362 | net_srandom(ifa->ifa_local); | |
363 | ifap = last_primary; | |
364 | } | |
365 | ||
366 | ifa->ifa_next = *ifap; | |
367 | *ifap = ifa; | |
368 | ||
369 | /* Send message first, then call notifier. | |
370 | Notifier will trigger FIB update, so that | |
371 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 372 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 373 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
374 | |
375 | return 0; | |
376 | } | |
377 | ||
d6062cbb TG |
378 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
379 | { | |
380 | return __inet_insert_ifa(ifa, NULL, 0); | |
381 | } | |
382 | ||
1da177e4 LT |
383 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
384 | { | |
e5ed6399 | 385 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
386 | |
387 | ASSERT_RTNL(); | |
388 | ||
389 | if (!in_dev) { | |
71e27da9 HX |
390 | inet_free_ifa(ifa); |
391 | return -ENOBUFS; | |
1da177e4 | 392 | } |
71e27da9 | 393 | ipv4_devconf_setall(in_dev); |
1da177e4 | 394 | if (ifa->ifa_dev != in_dev) { |
547b792c | 395 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
396 | in_dev_hold(in_dev); |
397 | ifa->ifa_dev = in_dev; | |
398 | } | |
f97c1e0c | 399 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
400 | ifa->ifa_scope = RT_SCOPE_HOST; |
401 | return inet_insert_ifa(ifa); | |
402 | } | |
403 | ||
7fee0ca2 | 404 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
405 | { |
406 | struct net_device *dev; | |
407 | struct in_device *in_dev = NULL; | |
408 | read_lock(&dev_base_lock); | |
7fee0ca2 | 409 | dev = __dev_get_by_index(net, ifindex); |
1da177e4 LT |
410 | if (dev) |
411 | in_dev = in_dev_get(dev); | |
412 | read_unlock(&dev_base_lock); | |
413 | return in_dev; | |
414 | } | |
415 | ||
416 | /* Called only from RTNL semaphored context. No locks. */ | |
417 | ||
60cad5da AV |
418 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
419 | __be32 mask) | |
1da177e4 LT |
420 | { |
421 | ASSERT_RTNL(); | |
422 | ||
423 | for_primary_ifa(in_dev) { | |
424 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
425 | return ifa; | |
426 | } endfor_ifa(in_dev); | |
427 | return NULL; | |
428 | } | |
429 | ||
430 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
431 | { | |
3b1e0a65 | 432 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 433 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 434 | struct in_device *in_dev; |
dfdd5fd4 | 435 | struct ifaddrmsg *ifm; |
1da177e4 | 436 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 437 | int err = -EINVAL; |
1da177e4 LT |
438 | |
439 | ASSERT_RTNL(); | |
440 | ||
dfdd5fd4 TG |
441 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
442 | if (err < 0) | |
443 | goto errout; | |
444 | ||
445 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 446 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
dfdd5fd4 TG |
447 | if (in_dev == NULL) { |
448 | err = -ENODEV; | |
449 | goto errout; | |
450 | } | |
451 | ||
1da177e4 LT |
452 | __in_dev_put(in_dev); |
453 | ||
454 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
455 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 456 | if (tb[IFA_LOCAL] && |
a7a628c4 | 457 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
458 | continue; |
459 | ||
460 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 461 | continue; |
dfdd5fd4 TG |
462 | |
463 | if (tb[IFA_ADDRESS] && | |
464 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 465 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
466 | continue; |
467 | ||
d6062cbb | 468 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
469 | return 0; |
470 | } | |
dfdd5fd4 TG |
471 | |
472 | err = -EADDRNOTAVAIL; | |
473 | errout: | |
474 | return err; | |
1da177e4 LT |
475 | } |
476 | ||
4b8aa9ab | 477 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) |
1da177e4 | 478 | { |
5c753978 TG |
479 | struct nlattr *tb[IFA_MAX+1]; |
480 | struct in_ifaddr *ifa; | |
481 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
482 | struct net_device *dev; |
483 | struct in_device *in_dev; | |
7b218574 | 484 | int err; |
1da177e4 | 485 | |
5c753978 TG |
486 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
487 | if (err < 0) | |
488 | goto errout; | |
1da177e4 | 489 | |
5c753978 | 490 | ifm = nlmsg_data(nlh); |
7b218574 DL |
491 | err = -EINVAL; |
492 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
5c753978 | 493 | goto errout; |
1da177e4 | 494 | |
4b8aa9ab | 495 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 DL |
496 | err = -ENODEV; |
497 | if (dev == NULL) | |
5c753978 | 498 | goto errout; |
1da177e4 | 499 | |
5c753978 | 500 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 DL |
501 | err = -ENOBUFS; |
502 | if (in_dev == NULL) | |
71e27da9 | 503 | goto errout; |
1da177e4 | 504 | |
5c753978 | 505 | ifa = inet_alloc_ifa(); |
7b218574 | 506 | if (ifa == NULL) |
5c753978 TG |
507 | /* |
508 | * A potential indev allocation can be left alive, it stays | |
509 | * assigned to its device and is destroy with it. | |
510 | */ | |
5c753978 | 511 | goto errout; |
5c753978 | 512 | |
a4e65d36 | 513 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
514 | in_dev_hold(in_dev); |
515 | ||
516 | if (tb[IFA_ADDRESS] == NULL) | |
517 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 518 | |
1da177e4 LT |
519 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
520 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
521 | ifa->ifa_flags = ifm->ifa_flags; |
522 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
523 | ifa->ifa_dev = in_dev; |
524 | ||
a7a628c4 AV |
525 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
526 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
527 | |
528 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 529 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 | 530 | |
5c753978 TG |
531 | if (tb[IFA_LABEL]) |
532 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
533 | else |
534 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
535 | ||
5c753978 TG |
536 | return ifa; |
537 | ||
538 | errout: | |
539 | return ERR_PTR(err); | |
540 | } | |
541 | ||
542 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
543 | { | |
3b1e0a65 | 544 | struct net *net = sock_net(skb->sk); |
5c753978 TG |
545 | struct in_ifaddr *ifa; |
546 | ||
547 | ASSERT_RTNL(); | |
548 | ||
4b8aa9ab | 549 | ifa = rtm_to_ifaddr(net, nlh); |
5c753978 TG |
550 | if (IS_ERR(ifa)) |
551 | return PTR_ERR(ifa); | |
552 | ||
d6062cbb | 553 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
554 | } |
555 | ||
556 | /* | |
557 | * Determine a default network mask, based on the IP address. | |
558 | */ | |
559 | ||
714e85be | 560 | static __inline__ int inet_abc_len(__be32 addr) |
1da177e4 LT |
561 | { |
562 | int rc = -1; /* Something else, probably a multicast. */ | |
563 | ||
f97c1e0c | 564 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 565 | rc = 0; |
1da177e4 | 566 | else { |
714e85be | 567 | __u32 haddr = ntohl(addr); |
1da177e4 | 568 | |
714e85be | 569 | if (IN_CLASSA(haddr)) |
1da177e4 | 570 | rc = 8; |
714e85be | 571 | else if (IN_CLASSB(haddr)) |
1da177e4 | 572 | rc = 16; |
714e85be | 573 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
574 | rc = 24; |
575 | } | |
576 | ||
e905a9ed | 577 | return rc; |
1da177e4 LT |
578 | } |
579 | ||
580 | ||
e5b13cb1 | 581 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
582 | { |
583 | struct ifreq ifr; | |
584 | struct sockaddr_in sin_orig; | |
585 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
586 | struct in_device *in_dev; | |
587 | struct in_ifaddr **ifap = NULL; | |
588 | struct in_ifaddr *ifa = NULL; | |
589 | struct net_device *dev; | |
590 | char *colon; | |
591 | int ret = -EFAULT; | |
592 | int tryaddrmatch = 0; | |
593 | ||
594 | /* | |
595 | * Fetch the caller's info block into kernel space | |
596 | */ | |
597 | ||
598 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
599 | goto out; | |
600 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
601 | ||
602 | /* save original address for comparison */ | |
603 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
604 | ||
605 | colon = strchr(ifr.ifr_name, ':'); | |
606 | if (colon) | |
607 | *colon = 0; | |
608 | ||
e5b13cb1 | 609 | dev_load(net, ifr.ifr_name); |
1da177e4 | 610 | |
132adf54 | 611 | switch (cmd) { |
1da177e4 LT |
612 | case SIOCGIFADDR: /* Get interface address */ |
613 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
614 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
615 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
616 | /* Note that these ioctls will not sleep, | |
617 | so that we do not impose a lock. | |
618 | One day we will be forced to put shlock here (I mean SMP) | |
619 | */ | |
620 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
621 | memset(sin, 0, sizeof(*sin)); | |
622 | sin->sin_family = AF_INET; | |
623 | break; | |
624 | ||
625 | case SIOCSIFFLAGS: | |
626 | ret = -EACCES; | |
627 | if (!capable(CAP_NET_ADMIN)) | |
628 | goto out; | |
629 | break; | |
630 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
631 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
632 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
633 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
634 | ret = -EACCES; | |
635 | if (!capable(CAP_NET_ADMIN)) | |
636 | goto out; | |
637 | ret = -EINVAL; | |
638 | if (sin->sin_family != AF_INET) | |
639 | goto out; | |
640 | break; | |
641 | default: | |
642 | ret = -EINVAL; | |
643 | goto out; | |
644 | } | |
645 | ||
646 | rtnl_lock(); | |
647 | ||
648 | ret = -ENODEV; | |
e5b13cb1 | 649 | if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL) |
1da177e4 LT |
650 | goto done; |
651 | ||
652 | if (colon) | |
653 | *colon = ':'; | |
654 | ||
e5ed6399 | 655 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
656 | if (tryaddrmatch) { |
657 | /* Matthias Andree */ | |
658 | /* compare label and address (4.4BSD style) */ | |
659 | /* note: we only do this for a limited set of ioctls | |
660 | and only if the original address family was AF_INET. | |
661 | This is checked above. */ | |
662 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
663 | ifap = &ifa->ifa_next) { | |
664 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
665 | sin_orig.sin_addr.s_addr == | |
666 | ifa->ifa_address) { | |
667 | break; /* found */ | |
668 | } | |
669 | } | |
670 | } | |
671 | /* we didn't get a match, maybe the application is | |
672 | 4.3BSD-style and passed in junk so we fall back to | |
673 | comparing just the label */ | |
674 | if (!ifa) { | |
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 | break; | |
679 | } | |
680 | } | |
681 | ||
682 | ret = -EADDRNOTAVAIL; | |
683 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
684 | goto done; | |
685 | ||
132adf54 | 686 | switch (cmd) { |
1da177e4 LT |
687 | case SIOCGIFADDR: /* Get interface address */ |
688 | sin->sin_addr.s_addr = ifa->ifa_local; | |
689 | goto rarok; | |
690 | ||
691 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
692 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
693 | goto rarok; | |
694 | ||
695 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
696 | sin->sin_addr.s_addr = ifa->ifa_address; | |
697 | goto rarok; | |
698 | ||
699 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
700 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
701 | goto rarok; | |
702 | ||
703 | case SIOCSIFFLAGS: | |
704 | if (colon) { | |
705 | ret = -EADDRNOTAVAIL; | |
706 | if (!ifa) | |
707 | break; | |
708 | ret = 0; | |
709 | if (!(ifr.ifr_flags & IFF_UP)) | |
710 | inet_del_ifa(in_dev, ifap, 1); | |
711 | break; | |
712 | } | |
713 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
714 | break; | |
715 | ||
716 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
717 | ret = -EINVAL; | |
718 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
719 | break; | |
720 | ||
721 | if (!ifa) { | |
722 | ret = -ENOBUFS; | |
723 | if ((ifa = inet_alloc_ifa()) == NULL) | |
724 | break; | |
725 | if (colon) | |
726 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
727 | else | |
728 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
729 | } else { | |
730 | ret = 0; | |
731 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
732 | break; | |
733 | inet_del_ifa(in_dev, ifap, 0); | |
734 | ifa->ifa_broadcast = 0; | |
148f9729 | 735 | ifa->ifa_scope = 0; |
1da177e4 LT |
736 | } |
737 | ||
738 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
739 | ||
740 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
741 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
742 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
743 | if ((dev->flags & IFF_BROADCAST) && | |
744 | ifa->ifa_prefixlen < 31) | |
745 | ifa->ifa_broadcast = ifa->ifa_address | | |
746 | ~ifa->ifa_mask; | |
747 | } else { | |
748 | ifa->ifa_prefixlen = 32; | |
749 | ifa->ifa_mask = inet_make_mask(32); | |
750 | } | |
751 | ret = inet_set_ifa(dev, ifa); | |
752 | break; | |
753 | ||
754 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
755 | ret = 0; | |
756 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
757 | inet_del_ifa(in_dev, ifap, 0); | |
758 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
759 | inet_insert_ifa(ifa); | |
760 | } | |
761 | break; | |
762 | ||
763 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
764 | ret = 0; | |
765 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
766 | break; | |
767 | ret = -EINVAL; | |
768 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
769 | break; | |
770 | ret = 0; | |
771 | inet_del_ifa(in_dev, ifap, 0); | |
772 | ifa->ifa_address = sin->sin_addr.s_addr; | |
773 | inet_insert_ifa(ifa); | |
774 | break; | |
775 | ||
776 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
777 | ||
778 | /* | |
779 | * The mask we set must be legal. | |
780 | */ | |
781 | ret = -EINVAL; | |
782 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
783 | break; | |
784 | ret = 0; | |
785 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 786 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
787 | inet_del_ifa(in_dev, ifap, 0); |
788 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
789 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
790 | ||
791 | /* See if current broadcast address matches | |
792 | * with current netmask, then recalculate | |
793 | * the broadcast address. Otherwise it's a | |
794 | * funny address, so don't touch it since | |
795 | * the user seems to know what (s)he's doing... | |
796 | */ | |
797 | if ((dev->flags & IFF_BROADCAST) && | |
798 | (ifa->ifa_prefixlen < 31) && | |
799 | (ifa->ifa_broadcast == | |
dcab5e1e | 800 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
801 | ifa->ifa_broadcast = (ifa->ifa_local | |
802 | ~sin->sin_addr.s_addr); | |
803 | } | |
804 | inet_insert_ifa(ifa); | |
805 | } | |
806 | break; | |
807 | } | |
808 | done: | |
809 | rtnl_unlock(); | |
810 | out: | |
811 | return ret; | |
812 | rarok: | |
813 | rtnl_unlock(); | |
814 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
815 | goto out; | |
816 | } | |
817 | ||
818 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
819 | { | |
e5ed6399 | 820 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
821 | struct in_ifaddr *ifa; |
822 | struct ifreq ifr; | |
823 | int done = 0; | |
824 | ||
825 | if (!in_dev || (ifa = in_dev->ifa_list) == NULL) | |
826 | goto out; | |
827 | ||
828 | for (; ifa; ifa = ifa->ifa_next) { | |
829 | if (!buf) { | |
830 | done += sizeof(ifr); | |
831 | continue; | |
832 | } | |
833 | if (len < (int) sizeof(ifr)) | |
834 | break; | |
835 | memset(&ifr, 0, sizeof(struct ifreq)); | |
836 | if (ifa->ifa_label) | |
837 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
838 | else | |
839 | strcpy(ifr.ifr_name, dev->name); | |
840 | ||
841 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
842 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
843 | ifa->ifa_local; | |
844 | ||
845 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
846 | done = -EFAULT; | |
847 | break; | |
848 | } | |
849 | buf += sizeof(struct ifreq); | |
850 | len -= sizeof(struct ifreq); | |
851 | done += sizeof(struct ifreq); | |
852 | } | |
853 | out: | |
854 | return done; | |
855 | } | |
856 | ||
a61ced5d | 857 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 858 | { |
a61ced5d | 859 | __be32 addr = 0; |
1da177e4 | 860 | struct in_device *in_dev; |
c346dca1 | 861 | struct net *net = dev_net(dev); |
1da177e4 LT |
862 | |
863 | rcu_read_lock(); | |
e5ed6399 | 864 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
865 | if (!in_dev) |
866 | goto no_in_dev; | |
867 | ||
868 | for_primary_ifa(in_dev) { | |
869 | if (ifa->ifa_scope > scope) | |
870 | continue; | |
871 | if (!dst || inet_ifa_match(dst, ifa)) { | |
872 | addr = ifa->ifa_local; | |
873 | break; | |
874 | } | |
875 | if (!addr) | |
876 | addr = ifa->ifa_local; | |
877 | } endfor_ifa(in_dev); | |
878 | no_in_dev: | |
879 | rcu_read_unlock(); | |
880 | ||
881 | if (addr) | |
882 | goto out; | |
883 | ||
884 | /* Not loopback addresses on loopback should be preferred | |
885 | in this case. It is importnat that lo is the first interface | |
886 | in dev_base list. | |
887 | */ | |
888 | read_lock(&dev_base_lock); | |
889 | rcu_read_lock(); | |
c4544c72 | 890 | for_each_netdev(net, dev) { |
e5ed6399 | 891 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) |
1da177e4 LT |
892 | continue; |
893 | ||
894 | for_primary_ifa(in_dev) { | |
895 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
896 | ifa->ifa_scope <= scope) { | |
897 | addr = ifa->ifa_local; | |
898 | goto out_unlock_both; | |
899 | } | |
900 | } endfor_ifa(in_dev); | |
901 | } | |
902 | out_unlock_both: | |
903 | read_unlock(&dev_base_lock); | |
904 | rcu_read_unlock(); | |
905 | out: | |
906 | return addr; | |
907 | } | |
908 | ||
60cad5da AV |
909 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
910 | __be32 local, int scope) | |
1da177e4 LT |
911 | { |
912 | int same = 0; | |
a144ea4b | 913 | __be32 addr = 0; |
1da177e4 LT |
914 | |
915 | for_ifa(in_dev) { | |
916 | if (!addr && | |
917 | (local == ifa->ifa_local || !local) && | |
918 | ifa->ifa_scope <= scope) { | |
919 | addr = ifa->ifa_local; | |
920 | if (same) | |
921 | break; | |
922 | } | |
923 | if (!same) { | |
924 | same = (!local || inet_ifa_match(local, ifa)) && | |
925 | (!dst || inet_ifa_match(dst, ifa)); | |
926 | if (same && addr) { | |
927 | if (local || !dst) | |
928 | break; | |
929 | /* Is the selected addr into dst subnet? */ | |
930 | if (inet_ifa_match(addr, ifa)) | |
931 | break; | |
932 | /* No, then can we use new local src? */ | |
933 | if (ifa->ifa_scope <= scope) { | |
934 | addr = ifa->ifa_local; | |
935 | break; | |
936 | } | |
937 | /* search for large dst subnet for addr */ | |
938 | same = 0; | |
939 | } | |
940 | } | |
941 | } endfor_ifa(in_dev); | |
942 | ||
943 | return same? addr : 0; | |
944 | } | |
945 | ||
946 | /* | |
947 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 948 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
949 | * - dst: only in the same subnet as dst, 0=any dst |
950 | * - local: address, 0=autoselect the local address | |
951 | * - scope: maximum allowed scope value for the local address | |
952 | */ | |
9bd85e32 DL |
953 | __be32 inet_confirm_addr(struct in_device *in_dev, |
954 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 955 | { |
60cad5da | 956 | __be32 addr = 0; |
9bd85e32 | 957 | struct net_device *dev; |
39a6d063 | 958 | struct net *net; |
1da177e4 | 959 | |
39a6d063 | 960 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 961 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 962 | |
c346dca1 | 963 | net = dev_net(in_dev->dev); |
1da177e4 LT |
964 | read_lock(&dev_base_lock); |
965 | rcu_read_lock(); | |
39a6d063 | 966 | for_each_netdev(net, dev) { |
e5ed6399 | 967 | if ((in_dev = __in_dev_get_rcu(dev))) { |
1da177e4 LT |
968 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
969 | if (addr) | |
970 | break; | |
971 | } | |
972 | } | |
973 | rcu_read_unlock(); | |
974 | read_unlock(&dev_base_lock); | |
975 | ||
976 | return addr; | |
977 | } | |
978 | ||
979 | /* | |
980 | * Device notifier | |
981 | */ | |
982 | ||
983 | int register_inetaddr_notifier(struct notifier_block *nb) | |
984 | { | |
e041c683 | 985 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 LT |
986 | } |
987 | ||
988 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
989 | { | |
e041c683 | 990 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 LT |
991 | } |
992 | ||
993 | /* Rename ifa_labels for a device name change. Make some effort to preserve existing | |
994 | * alias numbering and to create unique labels if possible. | |
995 | */ | |
996 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 997 | { |
1da177e4 LT |
998 | struct in_ifaddr *ifa; |
999 | int named = 0; | |
1000 | ||
e905a9ed YH |
1001 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1002 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1003 | |
1004 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1005 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1006 | if (named++ == 0) |
573bf470 | 1007 | goto skip; |
44344b2a | 1008 | dot = strchr(old, ':'); |
e905a9ed YH |
1009 | if (dot == NULL) { |
1010 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1011 | dot = old; |
1012 | } | |
e905a9ed YH |
1013 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { |
1014 | strcat(ifa->ifa_label, dot); | |
1015 | } else { | |
1016 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
1017 | } | |
573bf470 TG |
1018 | skip: |
1019 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1020 | } |
1021 | } | |
1da177e4 | 1022 | |
06770843 BL |
1023 | static inline bool inetdev_valid_mtu(unsigned mtu) |
1024 | { | |
1025 | return mtu >= 68; | |
1026 | } | |
1027 | ||
1da177e4 LT |
1028 | /* Called only under RTNL semaphore */ |
1029 | ||
1030 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1031 | void *ptr) | |
1032 | { | |
1033 | struct net_device *dev = ptr; | |
e5ed6399 | 1034 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1035 | |
1036 | ASSERT_RTNL(); | |
1037 | ||
1038 | if (!in_dev) { | |
8030f544 | 1039 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1040 | in_dev = inetdev_init(dev); |
b217d616 HX |
1041 | if (!in_dev) |
1042 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1043 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1044 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1045 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1046 | } |
06770843 BL |
1047 | } else if (event == NETDEV_CHANGEMTU) { |
1048 | /* Re-enabling IP */ | |
1049 | if (inetdev_valid_mtu(dev->mtu)) | |
1050 | in_dev = inetdev_init(dev); | |
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: | |
06770843 | 1061 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 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); | |
eefef1cf SH |
1078 | /* fall through */ |
1079 | case NETDEV_CHANGEADDR: | |
1080 | if (IN_DEV_ARP_NOTIFY(in_dev)) | |
1081 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1082 | in_dev->ifa_list->ifa_address, | |
1083 | dev, | |
1084 | in_dev->ifa_list->ifa_address, | |
1085 | NULL, dev->dev_addr, NULL); | |
1da177e4 LT |
1086 | break; |
1087 | case NETDEV_DOWN: | |
1088 | ip_mc_down(in_dev); | |
1089 | break; | |
75c78500 MS |
1090 | case NETDEV_BONDING_OLDTYPE: |
1091 | ip_mc_unmap(in_dev); | |
1092 | break; | |
1093 | case NETDEV_BONDING_NEWTYPE: | |
1094 | ip_mc_remap(in_dev); | |
1095 | break; | |
1da177e4 | 1096 | case NETDEV_CHANGEMTU: |
06770843 | 1097 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1098 | break; |
06770843 | 1099 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1100 | case NETDEV_UNREGISTER: |
1101 | inetdev_destroy(in_dev); | |
1102 | break; | |
1103 | case NETDEV_CHANGENAME: | |
1104 | /* Do not notify about label change, this event is | |
1105 | * not interesting to applications using netlink. | |
1106 | */ | |
1107 | inetdev_changename(dev, in_dev); | |
1108 | ||
51602b2a | 1109 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1110 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1111 | break; |
1112 | } | |
1113 | out: | |
1114 | return NOTIFY_DONE; | |
1115 | } | |
1116 | ||
1117 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1118 | .notifier_call = inetdev_event, |
1da177e4 LT |
1119 | }; |
1120 | ||
339bf98f TG |
1121 | static inline size_t inet_nlmsg_size(void) |
1122 | { | |
1123 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1124 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1125 | + nla_total_size(4) /* IFA_LOCAL */ | |
1126 | + nla_total_size(4) /* IFA_BROADCAST */ | |
339bf98f TG |
1127 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ |
1128 | } | |
1129 | ||
1da177e4 | 1130 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1131 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1132 | { |
1133 | struct ifaddrmsg *ifm; | |
1134 | struct nlmsghdr *nlh; | |
1da177e4 | 1135 | |
47f68512 TG |
1136 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1137 | if (nlh == NULL) | |
26932566 | 1138 | return -EMSGSIZE; |
47f68512 TG |
1139 | |
1140 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1141 | ifm->ifa_family = AF_INET; |
1142 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1143 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1144 | ifm->ifa_scope = ifa->ifa_scope; | |
1145 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1146 | |
1da177e4 | 1147 | if (ifa->ifa_address) |
a7a628c4 | 1148 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1149 | |
1da177e4 | 1150 | if (ifa->ifa_local) |
a7a628c4 | 1151 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1152 | |
1da177e4 | 1153 | if (ifa->ifa_broadcast) |
a7a628c4 | 1154 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1155 | |
1da177e4 | 1156 | if (ifa->ifa_label[0]) |
47f68512 | 1157 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1158 | |
47f68512 TG |
1159 | return nlmsg_end(skb, nlh); |
1160 | ||
1161 | nla_put_failure: | |
26932566 PM |
1162 | nlmsg_cancel(skb, nlh); |
1163 | return -EMSGSIZE; | |
1da177e4 LT |
1164 | } |
1165 | ||
1166 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1167 | { | |
3b1e0a65 | 1168 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1169 | int idx, ip_idx; |
1170 | struct net_device *dev; | |
1171 | struct in_device *in_dev; | |
1172 | struct in_ifaddr *ifa; | |
1173 | int s_ip_idx, s_idx = cb->args[0]; | |
1174 | ||
1175 | s_ip_idx = ip_idx = cb->args[1]; | |
7562f876 | 1176 | idx = 0; |
4b8aa9ab | 1177 | for_each_netdev(net, dev) { |
1da177e4 | 1178 | if (idx < s_idx) |
7562f876 | 1179 | goto cont; |
1da177e4 LT |
1180 | if (idx > s_idx) |
1181 | s_ip_idx = 0; | |
6313c1e0 | 1182 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
7562f876 | 1183 | goto cont; |
1da177e4 LT |
1184 | |
1185 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1186 | ifa = ifa->ifa_next, ip_idx++) { | |
1187 | if (ip_idx < s_ip_idx) | |
596e4150 | 1188 | continue; |
1da177e4 LT |
1189 | if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, |
1190 | cb->nlh->nlmsg_seq, | |
6313c1e0 | 1191 | RTM_NEWADDR, NLM_F_MULTI) <= 0) |
1da177e4 | 1192 | goto done; |
1da177e4 | 1193 | } |
7562f876 PE |
1194 | cont: |
1195 | idx++; | |
1da177e4 LT |
1196 | } |
1197 | ||
1198 | done: | |
1da177e4 LT |
1199 | cb->args[0] = idx; |
1200 | cb->args[1] = ip_idx; | |
1201 | ||
1202 | return skb->len; | |
1203 | } | |
1204 | ||
539afedf | 1205 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
d6062cbb | 1206 | u32 pid) |
1da177e4 | 1207 | { |
47f68512 | 1208 | struct sk_buff *skb; |
d6062cbb TG |
1209 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1210 | int err = -ENOBUFS; | |
4b8aa9ab | 1211 | struct net *net; |
1da177e4 | 1212 | |
c346dca1 | 1213 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1214 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1215 | if (skb == NULL) |
d6062cbb TG |
1216 | goto errout; |
1217 | ||
1218 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1219 | if (err < 0) { |
1220 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1221 | WARN_ON(err == -EMSGSIZE); | |
1222 | kfree_skb(skb); | |
1223 | goto errout; | |
1224 | } | |
1ce85fe4 PNA |
1225 | rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1226 | return; | |
d6062cbb TG |
1227 | errout: |
1228 | if (err < 0) | |
4b8aa9ab | 1229 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1230 | } |
1231 | ||
1da177e4 LT |
1232 | #ifdef CONFIG_SYSCTL |
1233 | ||
c0ce9fb3 | 1234 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1235 | { |
1236 | struct net_device *dev; | |
1237 | ||
1238 | read_lock(&dev_base_lock); | |
c0ce9fb3 | 1239 | for_each_netdev(net, dev) { |
31be3085 HX |
1240 | struct in_device *in_dev; |
1241 | rcu_read_lock(); | |
1242 | in_dev = __in_dev_get_rcu(dev); | |
1243 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1244 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 HX |
1245 | rcu_read_unlock(); |
1246 | } | |
1247 | read_unlock(&dev_base_lock); | |
1248 | } | |
1249 | ||
c0ce9fb3 | 1250 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1251 | { |
1252 | struct net_device *dev; | |
586f1211 | 1253 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1254 | |
586f1211 | 1255 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1256 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
68dd299b PE |
1257 | |
1258 | read_lock(&dev_base_lock); | |
c0ce9fb3 | 1259 | for_each_netdev(net, dev) { |
68dd299b | 1260 | struct in_device *in_dev; |
0187bdfb BH |
1261 | if (on) |
1262 | dev_disable_lro(dev); | |
68dd299b PE |
1263 | rcu_read_lock(); |
1264 | in_dev = __in_dev_get_rcu(dev); | |
1265 | if (in_dev) | |
1266 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1267 | rcu_read_unlock(); | |
1268 | } | |
1269 | read_unlock(&dev_base_lock); | |
68dd299b PE |
1270 | } |
1271 | ||
31be3085 | 1272 | static int devinet_conf_proc(ctl_table *ctl, int write, |
539afedf | 1273 | struct file *filp, void __user *buffer, |
31be3085 HX |
1274 | size_t *lenp, loff_t *ppos) |
1275 | { | |
1276 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1277 | ||
1278 | if (write) { | |
1279 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1280 | struct net *net = ctl->extra2; |
31be3085 HX |
1281 | int i = (int *)ctl->data - cnf->data; |
1282 | ||
1283 | set_bit(i, cnf->state); | |
1284 | ||
9355bbd6 | 1285 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1286 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1287 | } |
1288 | ||
1289 | return ret; | |
1290 | } | |
1291 | ||
f221e726 | 1292 | static int devinet_conf_sysctl(ctl_table *table, |
31be3085 HX |
1293 | void __user *oldval, size_t __user *oldlenp, |
1294 | void __user *newval, size_t newlen) | |
1295 | { | |
1296 | struct ipv4_devconf *cnf; | |
c0ce9fb3 | 1297 | struct net *net; |
31be3085 HX |
1298 | int *valp = table->data; |
1299 | int new; | |
1300 | int i; | |
1301 | ||
1302 | if (!newval || !newlen) | |
1303 | return 0; | |
1304 | ||
1305 | if (newlen != sizeof(int)) | |
1306 | return -EINVAL; | |
1307 | ||
1308 | if (get_user(new, (int __user *)newval)) | |
1309 | return -EFAULT; | |
1310 | ||
1311 | if (new == *valp) | |
1312 | return 0; | |
1313 | ||
1314 | if (oldval && oldlenp) { | |
1315 | size_t len; | |
1316 | ||
1317 | if (get_user(len, oldlenp)) | |
1318 | return -EFAULT; | |
1319 | ||
1320 | if (len) { | |
1321 | if (len > table->maxlen) | |
1322 | len = table->maxlen; | |
1323 | if (copy_to_user(oldval, valp, len)) | |
1324 | return -EFAULT; | |
1325 | if (put_user(len, oldlenp)) | |
1326 | return -EFAULT; | |
1327 | } | |
1328 | } | |
1329 | ||
1330 | *valp = new; | |
1331 | ||
1332 | cnf = table->extra1; | |
c0ce9fb3 | 1333 | net = table->extra2; |
31be3085 HX |
1334 | i = (int *)table->data - cnf->data; |
1335 | ||
1336 | set_bit(i, cnf->state); | |
1337 | ||
9355bbd6 | 1338 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1339 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1340 | |
1341 | return 1; | |
1342 | } | |
1343 | ||
1da177e4 | 1344 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
539afedf | 1345 | struct file *filp, void __user *buffer, |
1da177e4 LT |
1346 | size_t *lenp, loff_t *ppos) |
1347 | { | |
1348 | int *valp = ctl->data; | |
1349 | int val = *valp; | |
1350 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1351 | ||
1352 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1353 | struct net *net = ctl->extra2; |
1354 | ||
0187bdfb | 1355 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
9b8adb5e EB |
1356 | if (!rtnl_trylock()) |
1357 | return restart_syscall(); | |
0187bdfb BH |
1358 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
1359 | inet_forward_change(net); | |
1360 | } else if (*valp) { | |
1361 | struct ipv4_devconf *cnf = ctl->extra1; | |
1362 | struct in_device *idev = | |
1363 | container_of(cnf, struct in_device, cnf); | |
1364 | dev_disable_lro(idev->dev); | |
1365 | } | |
1366 | rtnl_unlock(); | |
76e6ebfb | 1367 | rt_cache_flush(net, 0); |
0187bdfb | 1368 | } |
1da177e4 LT |
1369 | } |
1370 | ||
1371 | return ret; | |
1372 | } | |
1373 | ||
1374 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
539afedf | 1375 | struct file *filp, void __user *buffer, |
1da177e4 LT |
1376 | size_t *lenp, loff_t *ppos) |
1377 | { | |
1378 | int *valp = ctl->data; | |
1379 | int val = *valp; | |
1380 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
76e6ebfb | 1381 | struct net *net = ctl->extra2; |
1da177e4 LT |
1382 | |
1383 | if (write && *valp != val) | |
76e6ebfb | 1384 | rt_cache_flush(net, 0); |
1da177e4 LT |
1385 | |
1386 | return ret; | |
1387 | } | |
1388 | ||
f221e726 | 1389 | int ipv4_doint_and_flush_strategy(ctl_table *table, |
1da177e4 | 1390 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 1391 | void __user *newval, size_t newlen) |
1da177e4 | 1392 | { |
f221e726 | 1393 | int ret = devinet_conf_sysctl(table, oldval, oldlenp, newval, newlen); |
76e6ebfb | 1394 | struct net *net = table->extra2; |
1da177e4 | 1395 | |
31be3085 | 1396 | if (ret == 1) |
76e6ebfb | 1397 | rt_cache_flush(net, 0); |
1da177e4 | 1398 | |
31be3085 | 1399 | return ret; |
1da177e4 LT |
1400 | } |
1401 | ||
1402 | ||
42f811b8 HX |
1403 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \ |
1404 | { \ | |
1405 | .ctl_name = NET_IPV4_CONF_ ## attr, \ | |
1406 | .procname = name, \ | |
1407 | .data = ipv4_devconf.data + \ | |
1408 | NET_IPV4_CONF_ ## attr - 1, \ | |
1409 | .maxlen = sizeof(int), \ | |
1410 | .mode = mval, \ | |
1411 | .proc_handler = proc, \ | |
1412 | .strategy = sysctl, \ | |
31be3085 | 1413 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1414 | } |
1415 | ||
1416 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
31be3085 HX |
1417 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \ |
1418 | devinet_conf_sysctl) | |
42f811b8 HX |
1419 | |
1420 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
31be3085 HX |
1421 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \ |
1422 | devinet_conf_sysctl) | |
42f811b8 HX |
1423 | |
1424 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \ | |
1425 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl) | |
1426 | ||
1427 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
1428 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \ | |
1429 | ipv4_doint_and_flush_strategy) | |
1430 | ||
1da177e4 LT |
1431 | static struct devinet_sysctl_table { |
1432 | struct ctl_table_header *sysctl_header; | |
bfada697 PE |
1433 | struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; |
1434 | char *dev_name; | |
1da177e4 LT |
1435 | } devinet_sysctl = { |
1436 | .devinet_vars = { | |
42f811b8 | 1437 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
31be3085 HX |
1438 | devinet_sysctl_forward, |
1439 | devinet_conf_sysctl), | |
42f811b8 HX |
1440 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1441 | ||
1442 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1443 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1444 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1445 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1446 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1447 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1448 | "accept_source_route"), | |
1449 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), | |
1450 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1451 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1452 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1453 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1454 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1455 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1456 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1457 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 1458 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
42f811b8 HX |
1459 | |
1460 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1461 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1462 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1463 | "force_igmp_version"), | |
1464 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1465 | "promote_secondaries"), | |
1da177e4 | 1466 | }, |
1da177e4 LT |
1467 | }; |
1468 | ||
ea40b324 PE |
1469 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
1470 | int ctl_name, struct ipv4_devconf *p) | |
1da177e4 LT |
1471 | { |
1472 | int i; | |
9fa89642 | 1473 | struct devinet_sysctl_table *t; |
1da177e4 | 1474 | |
bfada697 PE |
1475 | #define DEVINET_CTL_PATH_DEV 3 |
1476 | ||
1477 | struct ctl_path devinet_ctl_path[] = { | |
1478 | { .procname = "net", .ctl_name = CTL_NET, }, | |
1479 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1480 | { .procname = "conf", .ctl_name = NET_IPV4_CONF, }, | |
1481 | { /* to be set */ }, | |
1482 | { }, | |
1483 | }; | |
1484 | ||
9fa89642 | 1485 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1486 | if (!t) |
9fa89642 PE |
1487 | goto out; |
1488 | ||
1da177e4 LT |
1489 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1490 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1491 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1492 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1493 | } |
1494 | ||
e905a9ed YH |
1495 | /* |
1496 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1497 | * by sysctl and we wouldn't want anyone to change it under our feet |
1498 | * (see SIOCSIFNAME). | |
e905a9ed | 1499 | */ |
bfada697 PE |
1500 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1501 | if (!t->dev_name) | |
9fa89642 | 1502 | goto free; |
1da177e4 | 1503 | |
bfada697 PE |
1504 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1505 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name; | |
1da177e4 | 1506 | |
752d14dc | 1507 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, |
bfada697 | 1508 | t->devinet_vars); |
1da177e4 | 1509 | if (!t->sysctl_header) |
9fa89642 | 1510 | goto free_procname; |
1da177e4 LT |
1511 | |
1512 | p->sysctl = t; | |
ea40b324 | 1513 | return 0; |
1da177e4 | 1514 | |
9fa89642 | 1515 | free_procname: |
bfada697 | 1516 | kfree(t->dev_name); |
9fa89642 | 1517 | free: |
1da177e4 | 1518 | kfree(t); |
9fa89642 | 1519 | out: |
ea40b324 | 1520 | return -ENOBUFS; |
1da177e4 LT |
1521 | } |
1522 | ||
51602b2a PE |
1523 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1524 | { | |
1525 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1526 | ||
1527 | if (t == NULL) | |
1528 | return; | |
1529 | ||
1530 | cnf->sysctl = NULL; | |
1531 | unregister_sysctl_table(t->sysctl_header); | |
1532 | kfree(t->dev_name); | |
1533 | kfree(t); | |
1534 | } | |
1535 | ||
66f27a52 PE |
1536 | static void devinet_sysctl_register(struct in_device *idev) |
1537 | { | |
51602b2a PE |
1538 | neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4, |
1539 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
c346dca1 | 1540 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, |
c0ce9fb3 | 1541 | idev->dev->ifindex, &idev->cnf); |
66f27a52 PE |
1542 | } |
1543 | ||
51602b2a | 1544 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1545 | { |
51602b2a PE |
1546 | __devinet_sysctl_unregister(&idev->cnf); |
1547 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 1548 | } |
1da177e4 | 1549 | |
68dd299b PE |
1550 | static struct ctl_table ctl_forward_entry[] = { |
1551 | { | |
1552 | .ctl_name = NET_IPV4_FORWARD, | |
1553 | .procname = "ip_forward", | |
1554 | .data = &ipv4_devconf.data[ | |
1555 | NET_IPV4_CONF_FORWARDING - 1], | |
1556 | .maxlen = sizeof(int), | |
1557 | .mode = 0644, | |
1558 | .proc_handler = devinet_sysctl_forward, | |
1559 | .strategy = devinet_conf_sysctl, | |
1560 | .extra1 = &ipv4_devconf, | |
c0ce9fb3 | 1561 | .extra2 = &init_net, |
68dd299b PE |
1562 | }, |
1563 | { }, | |
1564 | }; | |
1565 | ||
752d14dc | 1566 | static __net_initdata struct ctl_path net_ipv4_path[] = { |
68dd299b PE |
1567 | { .procname = "net", .ctl_name = CTL_NET, }, |
1568 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1569 | { }, | |
1570 | }; | |
2a75de0c | 1571 | #endif |
68dd299b | 1572 | |
752d14dc PE |
1573 | static __net_init int devinet_init_net(struct net *net) |
1574 | { | |
1575 | int err; | |
752d14dc | 1576 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
1577 | #ifdef CONFIG_SYSCTL |
1578 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 1579 | struct ctl_table_header *forw_hdr; |
2a75de0c | 1580 | #endif |
752d14dc PE |
1581 | |
1582 | err = -ENOMEM; | |
1583 | all = &ipv4_devconf; | |
1584 | dflt = &ipv4_devconf_dflt; | |
752d14dc PE |
1585 | |
1586 | if (net != &init_net) { | |
1587 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); | |
1588 | if (all == NULL) | |
1589 | goto err_alloc_all; | |
1590 | ||
1591 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1592 | if (dflt == NULL) | |
1593 | goto err_alloc_dflt; | |
1594 | ||
2a75de0c | 1595 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1596 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
1597 | if (tbl == NULL) | |
1598 | goto err_alloc_ctl; | |
1599 | ||
1600 | tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1]; | |
1601 | tbl[0].extra1 = all; | |
1602 | tbl[0].extra2 = net; | |
2a75de0c | 1603 | #endif |
752d14dc PE |
1604 | } |
1605 | ||
1606 | #ifdef CONFIG_SYSCTL | |
1607 | err = __devinet_sysctl_register(net, "all", | |
1608 | NET_PROTO_CONF_ALL, all); | |
1609 | if (err < 0) | |
1610 | goto err_reg_all; | |
1611 | ||
1612 | err = __devinet_sysctl_register(net, "default", | |
1613 | NET_PROTO_CONF_DEFAULT, dflt); | |
1614 | if (err < 0) | |
1615 | goto err_reg_dflt; | |
1616 | ||
1617 | err = -ENOMEM; | |
1618 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1619 | if (forw_hdr == NULL) | |
1620 | goto err_reg_ctl; | |
2a75de0c | 1621 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
1622 | #endif |
1623 | ||
752d14dc PE |
1624 | net->ipv4.devconf_all = all; |
1625 | net->ipv4.devconf_dflt = dflt; | |
1626 | return 0; | |
1627 | ||
1628 | #ifdef CONFIG_SYSCTL | |
1629 | err_reg_ctl: | |
1630 | __devinet_sysctl_unregister(dflt); | |
1631 | err_reg_dflt: | |
1632 | __devinet_sysctl_unregister(all); | |
1633 | err_reg_all: | |
1634 | if (tbl != ctl_forward_entry) | |
1635 | kfree(tbl); | |
752d14dc | 1636 | err_alloc_ctl: |
2a75de0c | 1637 | #endif |
752d14dc PE |
1638 | if (dflt != &ipv4_devconf_dflt) |
1639 | kfree(dflt); | |
1640 | err_alloc_dflt: | |
1641 | if (all != &ipv4_devconf) | |
1642 | kfree(all); | |
1643 | err_alloc_all: | |
1644 | return err; | |
1645 | } | |
1646 | ||
1647 | static __net_exit void devinet_exit_net(struct net *net) | |
1648 | { | |
2a75de0c | 1649 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1650 | struct ctl_table *tbl; |
1651 | ||
1652 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
1653 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
1654 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1655 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 1656 | kfree(tbl); |
2a75de0c | 1657 | #endif |
752d14dc PE |
1658 | kfree(net->ipv4.devconf_dflt); |
1659 | kfree(net->ipv4.devconf_all); | |
1660 | } | |
1661 | ||
1662 | static __net_initdata struct pernet_operations devinet_ops = { | |
1663 | .init = devinet_init_net, | |
1664 | .exit = devinet_exit_net, | |
1665 | }; | |
1666 | ||
1da177e4 LT |
1667 | void __init devinet_init(void) |
1668 | { | |
752d14dc PE |
1669 | register_pernet_subsys(&devinet_ops); |
1670 | ||
1da177e4 LT |
1671 | register_gifconf(PF_INET, inet_gifconf); |
1672 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f TG |
1673 | |
1674 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1675 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1676 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 LT |
1677 | } |
1678 | ||
1da177e4 LT |
1679 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1680 | EXPORT_SYMBOL(inet_select_addr); | |
1681 | EXPORT_SYMBOL(inetdev_by_index); | |
1682 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
1683 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |