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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 | ||
547b792c IJ |
141 | WARN_ON(idev->ifa_list); |
142 | WARN_ON(idev->mc_list); | |
1da177e4 LT |
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 | 401 | if (ifa->ifa_dev != in_dev) { |
547b792c | 402 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
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 | ||
e5b13cb1 | 616 | dev_load(net, ifr.ifr_name); |
1da177e4 | 617 | |
132adf54 | 618 | switch (cmd) { |
1da177e4 LT |
619 | case SIOCGIFADDR: /* Get interface address */ |
620 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
621 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
622 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
623 | /* Note that these ioctls will not sleep, | |
624 | so that we do not impose a lock. | |
625 | One day we will be forced to put shlock here (I mean SMP) | |
626 | */ | |
627 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
628 | memset(sin, 0, sizeof(*sin)); | |
629 | sin->sin_family = AF_INET; | |
630 | break; | |
631 | ||
632 | case SIOCSIFFLAGS: | |
633 | ret = -EACCES; | |
634 | if (!capable(CAP_NET_ADMIN)) | |
635 | goto out; | |
636 | break; | |
637 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
638 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
639 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
640 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
641 | ret = -EACCES; | |
642 | if (!capable(CAP_NET_ADMIN)) | |
643 | goto out; | |
644 | ret = -EINVAL; | |
645 | if (sin->sin_family != AF_INET) | |
646 | goto out; | |
647 | break; | |
648 | default: | |
649 | ret = -EINVAL; | |
650 | goto out; | |
651 | } | |
652 | ||
653 | rtnl_lock(); | |
654 | ||
655 | ret = -ENODEV; | |
e5b13cb1 | 656 | if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL) |
1da177e4 LT |
657 | goto done; |
658 | ||
659 | if (colon) | |
660 | *colon = ':'; | |
661 | ||
e5ed6399 | 662 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
663 | if (tryaddrmatch) { |
664 | /* Matthias Andree */ | |
665 | /* compare label and address (4.4BSD style) */ | |
666 | /* note: we only do this for a limited set of ioctls | |
667 | and only if the original address family was AF_INET. | |
668 | This is checked above. */ | |
669 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
670 | ifap = &ifa->ifa_next) { | |
671 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
672 | sin_orig.sin_addr.s_addr == | |
673 | ifa->ifa_address) { | |
674 | break; /* found */ | |
675 | } | |
676 | } | |
677 | } | |
678 | /* we didn't get a match, maybe the application is | |
679 | 4.3BSD-style and passed in junk so we fall back to | |
680 | comparing just the label */ | |
681 | if (!ifa) { | |
682 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
683 | ifap = &ifa->ifa_next) | |
684 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
685 | break; | |
686 | } | |
687 | } | |
688 | ||
689 | ret = -EADDRNOTAVAIL; | |
690 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
691 | goto done; | |
692 | ||
132adf54 | 693 | switch (cmd) { |
1da177e4 LT |
694 | case SIOCGIFADDR: /* Get interface address */ |
695 | sin->sin_addr.s_addr = ifa->ifa_local; | |
696 | goto rarok; | |
697 | ||
698 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
699 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
700 | goto rarok; | |
701 | ||
702 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
703 | sin->sin_addr.s_addr = ifa->ifa_address; | |
704 | goto rarok; | |
705 | ||
706 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
707 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
708 | goto rarok; | |
709 | ||
710 | case SIOCSIFFLAGS: | |
711 | if (colon) { | |
712 | ret = -EADDRNOTAVAIL; | |
713 | if (!ifa) | |
714 | break; | |
715 | ret = 0; | |
716 | if (!(ifr.ifr_flags & IFF_UP)) | |
717 | inet_del_ifa(in_dev, ifap, 1); | |
718 | break; | |
719 | } | |
720 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
721 | break; | |
722 | ||
723 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
724 | ret = -EINVAL; | |
725 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
726 | break; | |
727 | ||
728 | if (!ifa) { | |
729 | ret = -ENOBUFS; | |
730 | if ((ifa = inet_alloc_ifa()) == NULL) | |
731 | break; | |
732 | if (colon) | |
733 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
734 | else | |
735 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
736 | } else { | |
737 | ret = 0; | |
738 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
739 | break; | |
740 | inet_del_ifa(in_dev, ifap, 0); | |
741 | ifa->ifa_broadcast = 0; | |
148f9729 | 742 | ifa->ifa_scope = 0; |
1da177e4 LT |
743 | } |
744 | ||
745 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
746 | ||
747 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
748 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
749 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
750 | if ((dev->flags & IFF_BROADCAST) && | |
751 | ifa->ifa_prefixlen < 31) | |
752 | ifa->ifa_broadcast = ifa->ifa_address | | |
753 | ~ifa->ifa_mask; | |
754 | } else { | |
755 | ifa->ifa_prefixlen = 32; | |
756 | ifa->ifa_mask = inet_make_mask(32); | |
757 | } | |
758 | ret = inet_set_ifa(dev, ifa); | |
759 | break; | |
760 | ||
761 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
762 | ret = 0; | |
763 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
764 | inet_del_ifa(in_dev, ifap, 0); | |
765 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
766 | inet_insert_ifa(ifa); | |
767 | } | |
768 | break; | |
769 | ||
770 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
771 | ret = 0; | |
772 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
773 | break; | |
774 | ret = -EINVAL; | |
775 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
776 | break; | |
777 | ret = 0; | |
778 | inet_del_ifa(in_dev, ifap, 0); | |
779 | ifa->ifa_address = sin->sin_addr.s_addr; | |
780 | inet_insert_ifa(ifa); | |
781 | break; | |
782 | ||
783 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
784 | ||
785 | /* | |
786 | * The mask we set must be legal. | |
787 | */ | |
788 | ret = -EINVAL; | |
789 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
790 | break; | |
791 | ret = 0; | |
792 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 793 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
794 | inet_del_ifa(in_dev, ifap, 0); |
795 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
796 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
797 | ||
798 | /* See if current broadcast address matches | |
799 | * with current netmask, then recalculate | |
800 | * the broadcast address. Otherwise it's a | |
801 | * funny address, so don't touch it since | |
802 | * the user seems to know what (s)he's doing... | |
803 | */ | |
804 | if ((dev->flags & IFF_BROADCAST) && | |
805 | (ifa->ifa_prefixlen < 31) && | |
806 | (ifa->ifa_broadcast == | |
dcab5e1e | 807 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
808 | ifa->ifa_broadcast = (ifa->ifa_local | |
809 | ~sin->sin_addr.s_addr); | |
810 | } | |
811 | inet_insert_ifa(ifa); | |
812 | } | |
813 | break; | |
814 | } | |
815 | done: | |
816 | rtnl_unlock(); | |
817 | out: | |
818 | return ret; | |
819 | rarok: | |
820 | rtnl_unlock(); | |
821 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
822 | goto out; | |
823 | } | |
824 | ||
825 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
826 | { | |
e5ed6399 | 827 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
828 | struct in_ifaddr *ifa; |
829 | struct ifreq ifr; | |
830 | int done = 0; | |
831 | ||
832 | if (!in_dev || (ifa = in_dev->ifa_list) == NULL) | |
833 | goto out; | |
834 | ||
835 | for (; ifa; ifa = ifa->ifa_next) { | |
836 | if (!buf) { | |
837 | done += sizeof(ifr); | |
838 | continue; | |
839 | } | |
840 | if (len < (int) sizeof(ifr)) | |
841 | break; | |
842 | memset(&ifr, 0, sizeof(struct ifreq)); | |
843 | if (ifa->ifa_label) | |
844 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
845 | else | |
846 | strcpy(ifr.ifr_name, dev->name); | |
847 | ||
848 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
849 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
850 | ifa->ifa_local; | |
851 | ||
852 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
853 | done = -EFAULT; | |
854 | break; | |
855 | } | |
856 | buf += sizeof(struct ifreq); | |
857 | len -= sizeof(struct ifreq); | |
858 | done += sizeof(struct ifreq); | |
859 | } | |
860 | out: | |
861 | return done; | |
862 | } | |
863 | ||
a61ced5d | 864 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 865 | { |
a61ced5d | 866 | __be32 addr = 0; |
1da177e4 | 867 | struct in_device *in_dev; |
c346dca1 | 868 | struct net *net = dev_net(dev); |
1da177e4 LT |
869 | |
870 | rcu_read_lock(); | |
e5ed6399 | 871 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
872 | if (!in_dev) |
873 | goto no_in_dev; | |
874 | ||
875 | for_primary_ifa(in_dev) { | |
876 | if (ifa->ifa_scope > scope) | |
877 | continue; | |
878 | if (!dst || inet_ifa_match(dst, ifa)) { | |
879 | addr = ifa->ifa_local; | |
880 | break; | |
881 | } | |
882 | if (!addr) | |
883 | addr = ifa->ifa_local; | |
884 | } endfor_ifa(in_dev); | |
885 | no_in_dev: | |
886 | rcu_read_unlock(); | |
887 | ||
888 | if (addr) | |
889 | goto out; | |
890 | ||
891 | /* Not loopback addresses on loopback should be preferred | |
892 | in this case. It is importnat that lo is the first interface | |
893 | in dev_base list. | |
894 | */ | |
895 | read_lock(&dev_base_lock); | |
896 | rcu_read_lock(); | |
c4544c72 | 897 | for_each_netdev(net, dev) { |
e5ed6399 | 898 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) |
1da177e4 LT |
899 | continue; |
900 | ||
901 | for_primary_ifa(in_dev) { | |
902 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
903 | ifa->ifa_scope <= scope) { | |
904 | addr = ifa->ifa_local; | |
905 | goto out_unlock_both; | |
906 | } | |
907 | } endfor_ifa(in_dev); | |
908 | } | |
909 | out_unlock_both: | |
910 | read_unlock(&dev_base_lock); | |
911 | rcu_read_unlock(); | |
912 | out: | |
913 | return addr; | |
914 | } | |
915 | ||
60cad5da AV |
916 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
917 | __be32 local, int scope) | |
1da177e4 LT |
918 | { |
919 | int same = 0; | |
a144ea4b | 920 | __be32 addr = 0; |
1da177e4 LT |
921 | |
922 | for_ifa(in_dev) { | |
923 | if (!addr && | |
924 | (local == ifa->ifa_local || !local) && | |
925 | ifa->ifa_scope <= scope) { | |
926 | addr = ifa->ifa_local; | |
927 | if (same) | |
928 | break; | |
929 | } | |
930 | if (!same) { | |
931 | same = (!local || inet_ifa_match(local, ifa)) && | |
932 | (!dst || inet_ifa_match(dst, ifa)); | |
933 | if (same && addr) { | |
934 | if (local || !dst) | |
935 | break; | |
936 | /* Is the selected addr into dst subnet? */ | |
937 | if (inet_ifa_match(addr, ifa)) | |
938 | break; | |
939 | /* No, then can we use new local src? */ | |
940 | if (ifa->ifa_scope <= scope) { | |
941 | addr = ifa->ifa_local; | |
942 | break; | |
943 | } | |
944 | /* search for large dst subnet for addr */ | |
945 | same = 0; | |
946 | } | |
947 | } | |
948 | } endfor_ifa(in_dev); | |
949 | ||
950 | return same? addr : 0; | |
951 | } | |
952 | ||
953 | /* | |
954 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 955 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
956 | * - dst: only in the same subnet as dst, 0=any dst |
957 | * - local: address, 0=autoselect the local address | |
958 | * - scope: maximum allowed scope value for the local address | |
959 | */ | |
9bd85e32 DL |
960 | __be32 inet_confirm_addr(struct in_device *in_dev, |
961 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 962 | { |
60cad5da | 963 | __be32 addr = 0; |
9bd85e32 | 964 | struct net_device *dev; |
39a6d063 | 965 | struct net *net; |
1da177e4 | 966 | |
39a6d063 | 967 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 968 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 969 | |
c346dca1 | 970 | net = dev_net(in_dev->dev); |
1da177e4 LT |
971 | read_lock(&dev_base_lock); |
972 | rcu_read_lock(); | |
39a6d063 | 973 | for_each_netdev(net, dev) { |
e5ed6399 | 974 | if ((in_dev = __in_dev_get_rcu(dev))) { |
1da177e4 LT |
975 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
976 | if (addr) | |
977 | break; | |
978 | } | |
979 | } | |
980 | rcu_read_unlock(); | |
981 | read_unlock(&dev_base_lock); | |
982 | ||
983 | return addr; | |
984 | } | |
985 | ||
986 | /* | |
987 | * Device notifier | |
988 | */ | |
989 | ||
990 | int register_inetaddr_notifier(struct notifier_block *nb) | |
991 | { | |
e041c683 | 992 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 LT |
993 | } |
994 | ||
995 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
996 | { | |
e041c683 | 997 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 LT |
998 | } |
999 | ||
1000 | /* Rename ifa_labels for a device name change. Make some effort to preserve existing | |
1001 | * alias numbering and to create unique labels if possible. | |
1002 | */ | |
1003 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1004 | { |
1da177e4 LT |
1005 | struct in_ifaddr *ifa; |
1006 | int named = 0; | |
1007 | ||
e905a9ed YH |
1008 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1009 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1010 | |
1011 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1012 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1013 | if (named++ == 0) |
573bf470 | 1014 | goto skip; |
44344b2a | 1015 | dot = strchr(old, ':'); |
e905a9ed YH |
1016 | if (dot == NULL) { |
1017 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1018 | dot = old; |
1019 | } | |
e905a9ed YH |
1020 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { |
1021 | strcat(ifa->ifa_label, dot); | |
1022 | } else { | |
1023 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
1024 | } | |
573bf470 TG |
1025 | skip: |
1026 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1027 | } |
1028 | } | |
1da177e4 | 1029 | |
06770843 BL |
1030 | static inline bool inetdev_valid_mtu(unsigned mtu) |
1031 | { | |
1032 | return mtu >= 68; | |
1033 | } | |
1034 | ||
1da177e4 LT |
1035 | /* Called only under RTNL semaphore */ |
1036 | ||
1037 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1038 | void *ptr) | |
1039 | { | |
1040 | struct net_device *dev = ptr; | |
e5ed6399 | 1041 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1042 | |
1043 | ASSERT_RTNL(); | |
1044 | ||
1045 | if (!in_dev) { | |
8030f544 | 1046 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1047 | in_dev = inetdev_init(dev); |
b217d616 HX |
1048 | if (!in_dev) |
1049 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1050 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1051 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1052 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1053 | } |
06770843 BL |
1054 | } else if (event == NETDEV_CHANGEMTU) { |
1055 | /* Re-enabling IP */ | |
1056 | if (inetdev_valid_mtu(dev->mtu)) | |
1057 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1058 | } |
1059 | goto out; | |
1060 | } | |
1061 | ||
1062 | switch (event) { | |
1063 | case NETDEV_REGISTER: | |
1064 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1065 | dev->ip_ptr = NULL; | |
1066 | break; | |
1067 | case NETDEV_UP: | |
06770843 | 1068 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1069 | break; |
0cc217e1 | 1070 | if (dev->flags & IFF_LOOPBACK) { |
1da177e4 LT |
1071 | struct in_ifaddr *ifa; |
1072 | if ((ifa = inet_alloc_ifa()) != NULL) { | |
1073 | ifa->ifa_local = | |
1074 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1075 | ifa->ifa_prefixlen = 8; | |
1076 | ifa->ifa_mask = inet_make_mask(8); | |
1077 | in_dev_hold(in_dev); | |
1078 | ifa->ifa_dev = in_dev; | |
1079 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1080 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1081 | inet_insert_ifa(ifa); | |
1082 | } | |
1083 | } | |
1084 | ip_mc_up(in_dev); | |
1085 | break; | |
1086 | case NETDEV_DOWN: | |
1087 | ip_mc_down(in_dev); | |
1088 | break; | |
1089 | case NETDEV_CHANGEMTU: | |
06770843 | 1090 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1091 | break; |
06770843 | 1092 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1093 | case NETDEV_UNREGISTER: |
1094 | inetdev_destroy(in_dev); | |
1095 | break; | |
1096 | case NETDEV_CHANGENAME: | |
1097 | /* Do not notify about label change, this event is | |
1098 | * not interesting to applications using netlink. | |
1099 | */ | |
1100 | inetdev_changename(dev, in_dev); | |
1101 | ||
51602b2a | 1102 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1103 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1104 | break; |
1105 | } | |
1106 | out: | |
1107 | return NOTIFY_DONE; | |
1108 | } | |
1109 | ||
1110 | static struct notifier_block ip_netdev_notifier = { | |
1111 | .notifier_call =inetdev_event, | |
1112 | }; | |
1113 | ||
339bf98f TG |
1114 | static inline size_t inet_nlmsg_size(void) |
1115 | { | |
1116 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1117 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1118 | + nla_total_size(4) /* IFA_LOCAL */ | |
1119 | + nla_total_size(4) /* IFA_BROADCAST */ | |
339bf98f TG |
1120 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ |
1121 | } | |
1122 | ||
1da177e4 | 1123 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1124 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1125 | { |
1126 | struct ifaddrmsg *ifm; | |
1127 | struct nlmsghdr *nlh; | |
1da177e4 | 1128 | |
47f68512 TG |
1129 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1130 | if (nlh == NULL) | |
26932566 | 1131 | return -EMSGSIZE; |
47f68512 TG |
1132 | |
1133 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1134 | ifm->ifa_family = AF_INET; |
1135 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1136 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1137 | ifm->ifa_scope = ifa->ifa_scope; | |
1138 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1139 | |
1da177e4 | 1140 | if (ifa->ifa_address) |
a7a628c4 | 1141 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1142 | |
1da177e4 | 1143 | if (ifa->ifa_local) |
a7a628c4 | 1144 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1145 | |
1da177e4 | 1146 | if (ifa->ifa_broadcast) |
a7a628c4 | 1147 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1148 | |
1da177e4 | 1149 | if (ifa->ifa_label[0]) |
47f68512 | 1150 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1151 | |
47f68512 TG |
1152 | return nlmsg_end(skb, nlh); |
1153 | ||
1154 | nla_put_failure: | |
26932566 PM |
1155 | nlmsg_cancel(skb, nlh); |
1156 | return -EMSGSIZE; | |
1da177e4 LT |
1157 | } |
1158 | ||
1159 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1160 | { | |
3b1e0a65 | 1161 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1162 | int idx, ip_idx; |
1163 | struct net_device *dev; | |
1164 | struct in_device *in_dev; | |
1165 | struct in_ifaddr *ifa; | |
1166 | int s_ip_idx, s_idx = cb->args[0]; | |
1167 | ||
1168 | s_ip_idx = ip_idx = cb->args[1]; | |
7562f876 | 1169 | idx = 0; |
4b8aa9ab | 1170 | for_each_netdev(net, dev) { |
1da177e4 | 1171 | if (idx < s_idx) |
7562f876 | 1172 | goto cont; |
1da177e4 LT |
1173 | if (idx > s_idx) |
1174 | s_ip_idx = 0; | |
6313c1e0 | 1175 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
7562f876 | 1176 | goto cont; |
1da177e4 LT |
1177 | |
1178 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1179 | ifa = ifa->ifa_next, ip_idx++) { | |
1180 | if (ip_idx < s_ip_idx) | |
596e4150 | 1181 | continue; |
1da177e4 LT |
1182 | if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, |
1183 | cb->nlh->nlmsg_seq, | |
6313c1e0 | 1184 | RTM_NEWADDR, NLM_F_MULTI) <= 0) |
1da177e4 | 1185 | goto done; |
1da177e4 | 1186 | } |
7562f876 PE |
1187 | cont: |
1188 | idx++; | |
1da177e4 LT |
1189 | } |
1190 | ||
1191 | done: | |
1da177e4 LT |
1192 | cb->args[0] = idx; |
1193 | cb->args[1] = ip_idx; | |
1194 | ||
1195 | return skb->len; | |
1196 | } | |
1197 | ||
d6062cbb TG |
1198 | static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh, |
1199 | u32 pid) | |
1da177e4 | 1200 | { |
47f68512 | 1201 | struct sk_buff *skb; |
d6062cbb TG |
1202 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1203 | int err = -ENOBUFS; | |
4b8aa9ab | 1204 | struct net *net; |
1da177e4 | 1205 | |
c346dca1 | 1206 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1207 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1208 | if (skb == NULL) |
d6062cbb TG |
1209 | goto errout; |
1210 | ||
1211 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1212 | if (err < 0) { |
1213 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1214 | WARN_ON(err == -EMSGSIZE); | |
1215 | kfree_skb(skb); | |
1216 | goto errout; | |
1217 | } | |
4b8aa9ab | 1218 | err = rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
d6062cbb TG |
1219 | errout: |
1220 | if (err < 0) | |
4b8aa9ab | 1221 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1222 | } |
1223 | ||
1da177e4 LT |
1224 | #ifdef CONFIG_SYSCTL |
1225 | ||
c0ce9fb3 | 1226 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1227 | { |
1228 | struct net_device *dev; | |
1229 | ||
1230 | read_lock(&dev_base_lock); | |
c0ce9fb3 | 1231 | for_each_netdev(net, dev) { |
31be3085 HX |
1232 | struct in_device *in_dev; |
1233 | rcu_read_lock(); | |
1234 | in_dev = __in_dev_get_rcu(dev); | |
1235 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1236 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 HX |
1237 | rcu_read_unlock(); |
1238 | } | |
1239 | read_unlock(&dev_base_lock); | |
1240 | } | |
1241 | ||
c0ce9fb3 | 1242 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1243 | { |
1244 | struct net_device *dev; | |
586f1211 | 1245 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1246 | |
586f1211 | 1247 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1248 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
68dd299b PE |
1249 | |
1250 | read_lock(&dev_base_lock); | |
c0ce9fb3 | 1251 | for_each_netdev(net, dev) { |
68dd299b | 1252 | struct in_device *in_dev; |
0187bdfb BH |
1253 | if (on) |
1254 | dev_disable_lro(dev); | |
68dd299b PE |
1255 | rcu_read_lock(); |
1256 | in_dev = __in_dev_get_rcu(dev); | |
1257 | if (in_dev) | |
1258 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1259 | rcu_read_unlock(); | |
1260 | } | |
1261 | read_unlock(&dev_base_lock); | |
68dd299b PE |
1262 | } |
1263 | ||
31be3085 HX |
1264 | static int devinet_conf_proc(ctl_table *ctl, int write, |
1265 | struct file* filp, void __user *buffer, | |
1266 | size_t *lenp, loff_t *ppos) | |
1267 | { | |
1268 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1269 | ||
1270 | if (write) { | |
1271 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1272 | struct net *net = ctl->extra2; |
31be3085 HX |
1273 | int i = (int *)ctl->data - cnf->data; |
1274 | ||
1275 | set_bit(i, cnf->state); | |
1276 | ||
9355bbd6 | 1277 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1278 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1279 | } |
1280 | ||
1281 | return ret; | |
1282 | } | |
1283 | ||
1284 | static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen, | |
1285 | void __user *oldval, size_t __user *oldlenp, | |
1286 | void __user *newval, size_t newlen) | |
1287 | { | |
1288 | struct ipv4_devconf *cnf; | |
c0ce9fb3 | 1289 | struct net *net; |
31be3085 HX |
1290 | int *valp = table->data; |
1291 | int new; | |
1292 | int i; | |
1293 | ||
1294 | if (!newval || !newlen) | |
1295 | return 0; | |
1296 | ||
1297 | if (newlen != sizeof(int)) | |
1298 | return -EINVAL; | |
1299 | ||
1300 | if (get_user(new, (int __user *)newval)) | |
1301 | return -EFAULT; | |
1302 | ||
1303 | if (new == *valp) | |
1304 | return 0; | |
1305 | ||
1306 | if (oldval && oldlenp) { | |
1307 | size_t len; | |
1308 | ||
1309 | if (get_user(len, oldlenp)) | |
1310 | return -EFAULT; | |
1311 | ||
1312 | if (len) { | |
1313 | if (len > table->maxlen) | |
1314 | len = table->maxlen; | |
1315 | if (copy_to_user(oldval, valp, len)) | |
1316 | return -EFAULT; | |
1317 | if (put_user(len, oldlenp)) | |
1318 | return -EFAULT; | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | *valp = new; | |
1323 | ||
1324 | cnf = table->extra1; | |
c0ce9fb3 | 1325 | net = table->extra2; |
31be3085 HX |
1326 | i = (int *)table->data - cnf->data; |
1327 | ||
1328 | set_bit(i, cnf->state); | |
1329 | ||
9355bbd6 | 1330 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1331 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1332 | |
1333 | return 1; | |
1334 | } | |
1335 | ||
1da177e4 LT |
1336 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
1337 | struct file* filp, void __user *buffer, | |
1338 | size_t *lenp, loff_t *ppos) | |
1339 | { | |
1340 | int *valp = ctl->data; | |
1341 | int val = *valp; | |
1342 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1343 | ||
1344 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1345 | struct net *net = ctl->extra2; |
1346 | ||
0187bdfb BH |
1347 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
1348 | rtnl_lock(); | |
1349 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { | |
1350 | inet_forward_change(net); | |
1351 | } else if (*valp) { | |
1352 | struct ipv4_devconf *cnf = ctl->extra1; | |
1353 | struct in_device *idev = | |
1354 | container_of(cnf, struct in_device, cnf); | |
1355 | dev_disable_lro(idev->dev); | |
1356 | } | |
1357 | rtnl_unlock(); | |
76e6ebfb | 1358 | rt_cache_flush(net, 0); |
0187bdfb | 1359 | } |
1da177e4 LT |
1360 | } |
1361 | ||
1362 | return ret; | |
1363 | } | |
1364 | ||
1365 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
1366 | struct file* filp, void __user *buffer, | |
1367 | size_t *lenp, loff_t *ppos) | |
1368 | { | |
1369 | int *valp = ctl->data; | |
1370 | int val = *valp; | |
1371 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
76e6ebfb | 1372 | struct net *net = ctl->extra2; |
1da177e4 LT |
1373 | |
1374 | if (write && *valp != val) | |
76e6ebfb | 1375 | rt_cache_flush(net, 0); |
1da177e4 LT |
1376 | |
1377 | return ret; | |
1378 | } | |
1379 | ||
1380 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
1381 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 1382 | void __user *newval, size_t newlen) |
1da177e4 | 1383 | { |
31be3085 HX |
1384 | int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp, |
1385 | newval, newlen); | |
76e6ebfb | 1386 | struct net *net = table->extra2; |
1da177e4 | 1387 | |
31be3085 | 1388 | if (ret == 1) |
76e6ebfb | 1389 | rt_cache_flush(net, 0); |
1da177e4 | 1390 | |
31be3085 | 1391 | return ret; |
1da177e4 LT |
1392 | } |
1393 | ||
1394 | ||
42f811b8 HX |
1395 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \ |
1396 | { \ | |
1397 | .ctl_name = NET_IPV4_CONF_ ## attr, \ | |
1398 | .procname = name, \ | |
1399 | .data = ipv4_devconf.data + \ | |
1400 | NET_IPV4_CONF_ ## attr - 1, \ | |
1401 | .maxlen = sizeof(int), \ | |
1402 | .mode = mval, \ | |
1403 | .proc_handler = proc, \ | |
1404 | .strategy = sysctl, \ | |
31be3085 | 1405 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1406 | } |
1407 | ||
1408 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
31be3085 HX |
1409 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \ |
1410 | devinet_conf_sysctl) | |
42f811b8 HX |
1411 | |
1412 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
31be3085 HX |
1413 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \ |
1414 | devinet_conf_sysctl) | |
42f811b8 HX |
1415 | |
1416 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \ | |
1417 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl) | |
1418 | ||
1419 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
1420 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \ | |
1421 | ipv4_doint_and_flush_strategy) | |
1422 | ||
1da177e4 LT |
1423 | static struct devinet_sysctl_table { |
1424 | struct ctl_table_header *sysctl_header; | |
bfada697 PE |
1425 | struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; |
1426 | char *dev_name; | |
1da177e4 LT |
1427 | } devinet_sysctl = { |
1428 | .devinet_vars = { | |
42f811b8 | 1429 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
31be3085 HX |
1430 | devinet_sysctl_forward, |
1431 | devinet_conf_sysctl), | |
42f811b8 HX |
1432 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1433 | ||
1434 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1435 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1436 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1437 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1438 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1439 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1440 | "accept_source_route"), | |
1441 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), | |
1442 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1443 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1444 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1445 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1446 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1447 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1448 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1449 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
1450 | ||
1451 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1452 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1453 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1454 | "force_igmp_version"), | |
1455 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1456 | "promote_secondaries"), | |
1da177e4 | 1457 | }, |
1da177e4 LT |
1458 | }; |
1459 | ||
ea40b324 PE |
1460 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
1461 | int ctl_name, struct ipv4_devconf *p) | |
1da177e4 LT |
1462 | { |
1463 | int i; | |
9fa89642 | 1464 | struct devinet_sysctl_table *t; |
1da177e4 | 1465 | |
bfada697 PE |
1466 | #define DEVINET_CTL_PATH_DEV 3 |
1467 | ||
1468 | struct ctl_path devinet_ctl_path[] = { | |
1469 | { .procname = "net", .ctl_name = CTL_NET, }, | |
1470 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1471 | { .procname = "conf", .ctl_name = NET_IPV4_CONF, }, | |
1472 | { /* to be set */ }, | |
1473 | { }, | |
1474 | }; | |
1475 | ||
9fa89642 | 1476 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1477 | if (!t) |
9fa89642 PE |
1478 | goto out; |
1479 | ||
1da177e4 LT |
1480 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1481 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1482 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1483 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1484 | } |
1485 | ||
e905a9ed YH |
1486 | /* |
1487 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1488 | * by sysctl and we wouldn't want anyone to change it under our feet |
1489 | * (see SIOCSIFNAME). | |
e905a9ed | 1490 | */ |
bfada697 PE |
1491 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1492 | if (!t->dev_name) | |
9fa89642 | 1493 | goto free; |
1da177e4 | 1494 | |
bfada697 PE |
1495 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1496 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name; | |
1da177e4 | 1497 | |
752d14dc | 1498 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, |
bfada697 | 1499 | t->devinet_vars); |
1da177e4 | 1500 | if (!t->sysctl_header) |
9fa89642 | 1501 | goto free_procname; |
1da177e4 LT |
1502 | |
1503 | p->sysctl = t; | |
ea40b324 | 1504 | return 0; |
1da177e4 | 1505 | |
9fa89642 | 1506 | free_procname: |
bfada697 | 1507 | kfree(t->dev_name); |
9fa89642 | 1508 | free: |
1da177e4 | 1509 | kfree(t); |
9fa89642 | 1510 | out: |
ea40b324 | 1511 | return -ENOBUFS; |
1da177e4 LT |
1512 | } |
1513 | ||
51602b2a PE |
1514 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1515 | { | |
1516 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1517 | ||
1518 | if (t == NULL) | |
1519 | return; | |
1520 | ||
1521 | cnf->sysctl = NULL; | |
1522 | unregister_sysctl_table(t->sysctl_header); | |
1523 | kfree(t->dev_name); | |
1524 | kfree(t); | |
1525 | } | |
1526 | ||
66f27a52 PE |
1527 | static void devinet_sysctl_register(struct in_device *idev) |
1528 | { | |
51602b2a PE |
1529 | neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4, |
1530 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
c346dca1 | 1531 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, |
c0ce9fb3 | 1532 | idev->dev->ifindex, &idev->cnf); |
66f27a52 PE |
1533 | } |
1534 | ||
51602b2a | 1535 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1536 | { |
51602b2a PE |
1537 | __devinet_sysctl_unregister(&idev->cnf); |
1538 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 1539 | } |
1da177e4 | 1540 | |
68dd299b PE |
1541 | static struct ctl_table ctl_forward_entry[] = { |
1542 | { | |
1543 | .ctl_name = NET_IPV4_FORWARD, | |
1544 | .procname = "ip_forward", | |
1545 | .data = &ipv4_devconf.data[ | |
1546 | NET_IPV4_CONF_FORWARDING - 1], | |
1547 | .maxlen = sizeof(int), | |
1548 | .mode = 0644, | |
1549 | .proc_handler = devinet_sysctl_forward, | |
1550 | .strategy = devinet_conf_sysctl, | |
1551 | .extra1 = &ipv4_devconf, | |
c0ce9fb3 | 1552 | .extra2 = &init_net, |
68dd299b PE |
1553 | }, |
1554 | { }, | |
1555 | }; | |
1556 | ||
752d14dc | 1557 | static __net_initdata struct ctl_path net_ipv4_path[] = { |
68dd299b PE |
1558 | { .procname = "net", .ctl_name = CTL_NET, }, |
1559 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
1560 | { }, | |
1561 | }; | |
2a75de0c | 1562 | #endif |
68dd299b | 1563 | |
752d14dc PE |
1564 | static __net_init int devinet_init_net(struct net *net) |
1565 | { | |
1566 | int err; | |
752d14dc | 1567 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
1568 | #ifdef CONFIG_SYSCTL |
1569 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 1570 | struct ctl_table_header *forw_hdr; |
2a75de0c | 1571 | #endif |
752d14dc PE |
1572 | |
1573 | err = -ENOMEM; | |
1574 | all = &ipv4_devconf; | |
1575 | dflt = &ipv4_devconf_dflt; | |
752d14dc PE |
1576 | |
1577 | if (net != &init_net) { | |
1578 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); | |
1579 | if (all == NULL) | |
1580 | goto err_alloc_all; | |
1581 | ||
1582 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1583 | if (dflt == NULL) | |
1584 | goto err_alloc_dflt; | |
1585 | ||
2a75de0c | 1586 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1587 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
1588 | if (tbl == NULL) | |
1589 | goto err_alloc_ctl; | |
1590 | ||
1591 | tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1]; | |
1592 | tbl[0].extra1 = all; | |
1593 | tbl[0].extra2 = net; | |
2a75de0c | 1594 | #endif |
752d14dc PE |
1595 | } |
1596 | ||
1597 | #ifdef CONFIG_SYSCTL | |
1598 | err = __devinet_sysctl_register(net, "all", | |
1599 | NET_PROTO_CONF_ALL, all); | |
1600 | if (err < 0) | |
1601 | goto err_reg_all; | |
1602 | ||
1603 | err = __devinet_sysctl_register(net, "default", | |
1604 | NET_PROTO_CONF_DEFAULT, dflt); | |
1605 | if (err < 0) | |
1606 | goto err_reg_dflt; | |
1607 | ||
1608 | err = -ENOMEM; | |
1609 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1610 | if (forw_hdr == NULL) | |
1611 | goto err_reg_ctl; | |
2a75de0c | 1612 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
1613 | #endif |
1614 | ||
752d14dc PE |
1615 | net->ipv4.devconf_all = all; |
1616 | net->ipv4.devconf_dflt = dflt; | |
1617 | return 0; | |
1618 | ||
1619 | #ifdef CONFIG_SYSCTL | |
1620 | err_reg_ctl: | |
1621 | __devinet_sysctl_unregister(dflt); | |
1622 | err_reg_dflt: | |
1623 | __devinet_sysctl_unregister(all); | |
1624 | err_reg_all: | |
1625 | if (tbl != ctl_forward_entry) | |
1626 | kfree(tbl); | |
752d14dc | 1627 | err_alloc_ctl: |
2a75de0c | 1628 | #endif |
752d14dc PE |
1629 | if (dflt != &ipv4_devconf_dflt) |
1630 | kfree(dflt); | |
1631 | err_alloc_dflt: | |
1632 | if (all != &ipv4_devconf) | |
1633 | kfree(all); | |
1634 | err_alloc_all: | |
1635 | return err; | |
1636 | } | |
1637 | ||
1638 | static __net_exit void devinet_exit_net(struct net *net) | |
1639 | { | |
2a75de0c | 1640 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1641 | struct ctl_table *tbl; |
1642 | ||
1643 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
1644 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
1645 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1646 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 1647 | kfree(tbl); |
2a75de0c | 1648 | #endif |
752d14dc PE |
1649 | kfree(net->ipv4.devconf_dflt); |
1650 | kfree(net->ipv4.devconf_all); | |
1651 | } | |
1652 | ||
1653 | static __net_initdata struct pernet_operations devinet_ops = { | |
1654 | .init = devinet_init_net, | |
1655 | .exit = devinet_exit_net, | |
1656 | }; | |
1657 | ||
1da177e4 LT |
1658 | void __init devinet_init(void) |
1659 | { | |
752d14dc PE |
1660 | register_pernet_subsys(&devinet_ops); |
1661 | ||
1da177e4 LT |
1662 | register_gifconf(PF_INET, inet_gifconf); |
1663 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f TG |
1664 | |
1665 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1666 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1667 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 LT |
1668 | } |
1669 | ||
1da177e4 LT |
1670 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1671 | EXPORT_SYMBOL(inet_select_addr); | |
1672 | EXPORT_SYMBOL(inetdev_by_index); | |
1673 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
1674 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |