Commit | Line | Data |
---|---|---|
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> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
1da177e4 LT |
54 | #ifdef CONFIG_SYSCTL |
55 | #include <linux/sysctl.h> | |
56 | #endif | |
57 | #include <linux/kmod.h> | |
58 | ||
14c85021 | 59 | #include <net/arp.h> |
1da177e4 LT |
60 | #include <net/ip.h> |
61 | #include <net/route.h> | |
62 | #include <net/ip_fib.h> | |
63f3444f | 63 | #include <net/rtnetlink.h> |
752d14dc | 64 | #include <net/net_namespace.h> |
1da177e4 | 65 | |
0027ba84 | 66 | static struct ipv4_devconf ipv4_devconf = { |
42f811b8 | 67 | .data = { |
02291680 EB |
68 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
69 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
70 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
71 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
42f811b8 | 72 | }, |
1da177e4 LT |
73 | }; |
74 | ||
75 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
42f811b8 | 76 | .data = { |
02291680 EB |
77 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
78 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
79 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
80 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
81 | [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1, | |
42f811b8 | 82 | }, |
1da177e4 LT |
83 | }; |
84 | ||
9355bbd6 PE |
85 | #define IPV4_DEVCONF_DFLT(net, attr) \ |
86 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
42f811b8 | 87 | |
ef7c79ed | 88 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
89 | [IFA_LOCAL] = { .type = NLA_U32 }, |
90 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
91 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
5176f91e | 92 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c753978 TG |
93 | }; |
94 | ||
d6062cbb | 95 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 96 | |
e041c683 | 97 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
98 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
99 | int destroy); | |
100 | #ifdef CONFIG_SYSCTL | |
66f27a52 | 101 | static void devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
102 | static void devinet_sysctl_unregister(struct in_device *idev); |
103 | #else | |
104 | static inline void devinet_sysctl_register(struct in_device *idev) | |
105 | { | |
106 | } | |
107 | static inline void devinet_sysctl_unregister(struct in_device *idev) | |
108 | { | |
109 | } | |
1da177e4 LT |
110 | #endif |
111 | ||
112 | /* Locks all the inet devices. */ | |
113 | ||
114 | static struct in_ifaddr *inet_alloc_ifa(void) | |
115 | { | |
93adcc80 | 116 | return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); |
1da177e4 LT |
117 | } |
118 | ||
119 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
120 | { | |
121 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
122 | if (ifa->ifa_dev) | |
123 | in_dev_put(ifa->ifa_dev); | |
124 | kfree(ifa); | |
125 | } | |
126 | ||
127 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
128 | { | |
129 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
130 | } | |
131 | ||
132 | void in_dev_finish_destroy(struct in_device *idev) | |
133 | { | |
134 | struct net_device *dev = idev->dev; | |
135 | ||
547b792c IJ |
136 | WARN_ON(idev->ifa_list); |
137 | WARN_ON(idev->mc_list); | |
1da177e4 LT |
138 | #ifdef NET_REFCNT_DEBUG |
139 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
140 | idev, dev ? dev->name : "NIL"); | |
141 | #endif | |
142 | dev_put(dev); | |
143 | if (!idev->dead) | |
9f9354b9 ED |
144 | pr_err("Freeing alive in_device %p\n", idev); |
145 | else | |
1da177e4 | 146 | kfree(idev); |
1da177e4 | 147 | } |
9f9354b9 | 148 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1da177e4 | 149 | |
71e27da9 | 150 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
151 | { |
152 | struct in_device *in_dev; | |
153 | ||
154 | ASSERT_RTNL(); | |
155 | ||
0da974f4 | 156 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
157 | if (!in_dev) |
158 | goto out; | |
c346dca1 | 159 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 160 | sizeof(in_dev->cnf)); |
1da177e4 LT |
161 | in_dev->cnf.sysctl = NULL; |
162 | in_dev->dev = dev; | |
9f9354b9 ED |
163 | in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); |
164 | if (!in_dev->arp_parms) | |
1da177e4 | 165 | goto out_kfree; |
0187bdfb BH |
166 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
167 | dev_disable_lro(dev); | |
1da177e4 LT |
168 | /* Reference in_dev->dev */ |
169 | dev_hold(dev); | |
30c4cf57 | 170 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 171 | in_dev_hold(in_dev); |
1da177e4 | 172 | |
66f27a52 | 173 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
174 | ip_mc_init_dev(in_dev); |
175 | if (dev->flags & IFF_UP) | |
176 | ip_mc_up(in_dev); | |
483479ec | 177 | |
30c4cf57 DS |
178 | /* we can receive as soon as ip_ptr is set -- do this last */ |
179 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 180 | out: |
1da177e4 LT |
181 | return in_dev; |
182 | out_kfree: | |
183 | kfree(in_dev); | |
184 | in_dev = NULL; | |
185 | goto out; | |
186 | } | |
187 | ||
188 | static void in_dev_rcu_put(struct rcu_head *head) | |
189 | { | |
190 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
191 | in_dev_put(idev); | |
192 | } | |
193 | ||
194 | static void inetdev_destroy(struct in_device *in_dev) | |
195 | { | |
196 | struct in_ifaddr *ifa; | |
197 | struct net_device *dev; | |
198 | ||
199 | ASSERT_RTNL(); | |
200 | ||
201 | dev = in_dev->dev; | |
1da177e4 LT |
202 | |
203 | in_dev->dead = 1; | |
204 | ||
205 | ip_mc_destroy_dev(in_dev); | |
206 | ||
207 | while ((ifa = in_dev->ifa_list) != NULL) { | |
208 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
209 | inet_free_ifa(ifa); | |
210 | } | |
211 | ||
1da177e4 LT |
212 | dev->ip_ptr = NULL; |
213 | ||
51602b2a | 214 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
215 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
216 | arp_ifdown(dev); | |
217 | ||
218 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
219 | } | |
220 | ||
ff428d72 | 221 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
222 | { |
223 | rcu_read_lock(); | |
224 | for_primary_ifa(in_dev) { | |
225 | if (inet_ifa_match(a, ifa)) { | |
226 | if (!b || inet_ifa_match(b, ifa)) { | |
227 | rcu_read_unlock(); | |
228 | return 1; | |
229 | } | |
230 | } | |
231 | } endfor_ifa(in_dev); | |
232 | rcu_read_unlock(); | |
233 | return 0; | |
234 | } | |
235 | ||
d6062cbb TG |
236 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
237 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 238 | { |
8f937c60 | 239 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
240 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
241 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
242 | struct in_ifaddr *prev_prom = NULL; | |
243 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
244 | |
245 | ASSERT_RTNL(); | |
246 | ||
e905a9ed | 247 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
248 | * unless alias promotion is set |
249 | **/ | |
1da177e4 LT |
250 | |
251 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
252 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
253 | ||
254 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 255 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
256 | ifa1->ifa_scope <= ifa->ifa_scope) |
257 | last_prim = ifa; | |
258 | ||
1da177e4 LT |
259 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
260 | ifa1->ifa_mask != ifa->ifa_mask || | |
261 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
262 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 263 | prev_prom = ifa; |
1da177e4 LT |
264 | continue; |
265 | } | |
266 | ||
0ff60a45 | 267 | if (!do_promote) { |
8f937c60 | 268 | *ifap1 = ifa->ifa_next; |
1da177e4 | 269 | |
d6062cbb | 270 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
271 | blocking_notifier_call_chain(&inetaddr_chain, |
272 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
273 | inet_free_ifa(ifa); |
274 | } else { | |
275 | promote = ifa; | |
276 | break; | |
277 | } | |
1da177e4 LT |
278 | } |
279 | } | |
280 | ||
281 | /* 2. Unlink it */ | |
282 | ||
283 | *ifap = ifa1->ifa_next; | |
284 | ||
285 | /* 3. Announce address deletion */ | |
286 | ||
287 | /* Send message first, then call notifier. | |
288 | At first sight, FIB update triggered by notifier | |
289 | will refer to already deleted ifaddr, that could confuse | |
290 | netlink listeners. It is not true: look, gated sees | |
291 | that route deleted and if it still thinks that ifaddr | |
292 | is valid, it will try to restore deleted routes... Grr. | |
293 | So that, this order is correct. | |
294 | */ | |
d6062cbb | 295 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 296 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 297 | |
0ff60a45 JHS |
298 | if (promote) { |
299 | ||
300 | if (prev_prom) { | |
301 | prev_prom->ifa_next = promote->ifa_next; | |
302 | promote->ifa_next = last_prim->ifa_next; | |
303 | last_prim->ifa_next = promote; | |
304 | } | |
8f937c60 | 305 | |
8f937c60 | 306 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 307 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
308 | blocking_notifier_call_chain(&inetaddr_chain, |
309 | NETDEV_UP, promote); | |
0ff60a45 JHS |
310 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
311 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
312 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
313 | continue; | |
314 | fib_add_ifaddr(ifa); | |
315 | } | |
316 | ||
317 | } | |
6363097c | 318 | if (destroy) |
0ff60a45 | 319 | inet_free_ifa(ifa1); |
1da177e4 LT |
320 | } |
321 | ||
d6062cbb TG |
322 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
323 | int destroy) | |
324 | { | |
325 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
326 | } | |
327 | ||
328 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
329 | u32 pid) | |
1da177e4 LT |
330 | { |
331 | struct in_device *in_dev = ifa->ifa_dev; | |
332 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
333 | ||
334 | ASSERT_RTNL(); | |
335 | ||
336 | if (!ifa->ifa_local) { | |
337 | inet_free_ifa(ifa); | |
338 | return 0; | |
339 | } | |
340 | ||
341 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
342 | last_primary = &in_dev->ifa_list; | |
343 | ||
344 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
345 | ifap = &ifa1->ifa_next) { | |
346 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
347 | ifa->ifa_scope <= ifa1->ifa_scope) | |
348 | last_primary = &ifa1->ifa_next; | |
349 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
350 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
351 | if (ifa1->ifa_local == ifa->ifa_local) { | |
352 | inet_free_ifa(ifa); | |
353 | return -EEXIST; | |
354 | } | |
355 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
356 | inet_free_ifa(ifa); | |
357 | return -EINVAL; | |
358 | } | |
359 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
360 | } | |
361 | } | |
362 | ||
363 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
364 | net_srandom(ifa->ifa_local); | |
365 | ifap = last_primary; | |
366 | } | |
367 | ||
368 | ifa->ifa_next = *ifap; | |
369 | *ifap = ifa; | |
370 | ||
371 | /* Send message first, then call notifier. | |
372 | Notifier will trigger FIB update, so that | |
373 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 374 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 375 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
376 | |
377 | return 0; | |
378 | } | |
379 | ||
d6062cbb TG |
380 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
381 | { | |
382 | return __inet_insert_ifa(ifa, NULL, 0); | |
383 | } | |
384 | ||
1da177e4 LT |
385 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
386 | { | |
e5ed6399 | 387 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
388 | |
389 | ASSERT_RTNL(); | |
390 | ||
391 | if (!in_dev) { | |
71e27da9 HX |
392 | inet_free_ifa(ifa); |
393 | return -ENOBUFS; | |
1da177e4 | 394 | } |
71e27da9 | 395 | ipv4_devconf_setall(in_dev); |
1da177e4 | 396 | if (ifa->ifa_dev != in_dev) { |
547b792c | 397 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
398 | in_dev_hold(in_dev); |
399 | ifa->ifa_dev = in_dev; | |
400 | } | |
f97c1e0c | 401 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
402 | ifa->ifa_scope = RT_SCOPE_HOST; |
403 | return inet_insert_ifa(ifa); | |
404 | } | |
405 | ||
7fee0ca2 | 406 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
407 | { |
408 | struct net_device *dev; | |
409 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
410 | |
411 | rcu_read_lock(); | |
412 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
413 | if (dev) |
414 | in_dev = in_dev_get(dev); | |
c148fc2e | 415 | rcu_read_unlock(); |
1da177e4 LT |
416 | return in_dev; |
417 | } | |
9f9354b9 | 418 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
419 | |
420 | /* Called only from RTNL semaphored context. No locks. */ | |
421 | ||
60cad5da AV |
422 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
423 | __be32 mask) | |
1da177e4 LT |
424 | { |
425 | ASSERT_RTNL(); | |
426 | ||
427 | for_primary_ifa(in_dev) { | |
428 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
429 | return ifa; | |
430 | } endfor_ifa(in_dev); | |
431 | return NULL; | |
432 | } | |
433 | ||
434 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
435 | { | |
3b1e0a65 | 436 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 437 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 438 | struct in_device *in_dev; |
dfdd5fd4 | 439 | struct ifaddrmsg *ifm; |
1da177e4 | 440 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 441 | int err = -EINVAL; |
1da177e4 LT |
442 | |
443 | ASSERT_RTNL(); | |
444 | ||
dfdd5fd4 TG |
445 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
446 | if (err < 0) | |
447 | goto errout; | |
448 | ||
449 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 450 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
dfdd5fd4 TG |
451 | if (in_dev == NULL) { |
452 | err = -ENODEV; | |
453 | goto errout; | |
454 | } | |
455 | ||
1da177e4 LT |
456 | __in_dev_put(in_dev); |
457 | ||
458 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
459 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 460 | if (tb[IFA_LOCAL] && |
a7a628c4 | 461 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
462 | continue; |
463 | ||
464 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 465 | continue; |
dfdd5fd4 TG |
466 | |
467 | if (tb[IFA_ADDRESS] && | |
468 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 469 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
470 | continue; |
471 | ||
d6062cbb | 472 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
473 | return 0; |
474 | } | |
dfdd5fd4 TG |
475 | |
476 | err = -EADDRNOTAVAIL; | |
477 | errout: | |
478 | return err; | |
1da177e4 LT |
479 | } |
480 | ||
4b8aa9ab | 481 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) |
1da177e4 | 482 | { |
5c753978 TG |
483 | struct nlattr *tb[IFA_MAX+1]; |
484 | struct in_ifaddr *ifa; | |
485 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
486 | struct net_device *dev; |
487 | struct in_device *in_dev; | |
7b218574 | 488 | int err; |
1da177e4 | 489 | |
5c753978 TG |
490 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
491 | if (err < 0) | |
492 | goto errout; | |
1da177e4 | 493 | |
5c753978 | 494 | ifm = nlmsg_data(nlh); |
7b218574 DL |
495 | err = -EINVAL; |
496 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
5c753978 | 497 | goto errout; |
1da177e4 | 498 | |
4b8aa9ab | 499 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 DL |
500 | err = -ENODEV; |
501 | if (dev == NULL) | |
5c753978 | 502 | goto errout; |
1da177e4 | 503 | |
5c753978 | 504 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 DL |
505 | err = -ENOBUFS; |
506 | if (in_dev == NULL) | |
71e27da9 | 507 | goto errout; |
1da177e4 | 508 | |
5c753978 | 509 | ifa = inet_alloc_ifa(); |
7b218574 | 510 | if (ifa == NULL) |
5c753978 TG |
511 | /* |
512 | * A potential indev allocation can be left alive, it stays | |
513 | * assigned to its device and is destroy with it. | |
514 | */ | |
5c753978 | 515 | goto errout; |
5c753978 | 516 | |
a4e65d36 | 517 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
518 | in_dev_hold(in_dev); |
519 | ||
520 | if (tb[IFA_ADDRESS] == NULL) | |
521 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 522 | |
1da177e4 LT |
523 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
524 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
525 | ifa->ifa_flags = ifm->ifa_flags; |
526 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
527 | ifa->ifa_dev = in_dev; |
528 | ||
a7a628c4 AV |
529 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
530 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
531 | |
532 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 533 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 | 534 | |
5c753978 TG |
535 | if (tb[IFA_LABEL]) |
536 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
537 | else |
538 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
539 | ||
5c753978 TG |
540 | return ifa; |
541 | ||
542 | errout: | |
543 | return ERR_PTR(err); | |
544 | } | |
545 | ||
546 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
547 | { | |
3b1e0a65 | 548 | struct net *net = sock_net(skb->sk); |
5c753978 TG |
549 | struct in_ifaddr *ifa; |
550 | ||
551 | ASSERT_RTNL(); | |
552 | ||
4b8aa9ab | 553 | ifa = rtm_to_ifaddr(net, nlh); |
5c753978 TG |
554 | if (IS_ERR(ifa)) |
555 | return PTR_ERR(ifa); | |
556 | ||
d6062cbb | 557 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
558 | } |
559 | ||
560 | /* | |
561 | * Determine a default network mask, based on the IP address. | |
562 | */ | |
563 | ||
9f9354b9 | 564 | static inline int inet_abc_len(__be32 addr) |
1da177e4 LT |
565 | { |
566 | int rc = -1; /* Something else, probably a multicast. */ | |
567 | ||
f97c1e0c | 568 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 569 | rc = 0; |
1da177e4 | 570 | else { |
714e85be | 571 | __u32 haddr = ntohl(addr); |
1da177e4 | 572 | |
714e85be | 573 | if (IN_CLASSA(haddr)) |
1da177e4 | 574 | rc = 8; |
714e85be | 575 | else if (IN_CLASSB(haddr)) |
1da177e4 | 576 | rc = 16; |
714e85be | 577 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
578 | rc = 24; |
579 | } | |
580 | ||
e905a9ed | 581 | return rc; |
1da177e4 LT |
582 | } |
583 | ||
584 | ||
e5b13cb1 | 585 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
586 | { |
587 | struct ifreq ifr; | |
588 | struct sockaddr_in sin_orig; | |
589 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
590 | struct in_device *in_dev; | |
591 | struct in_ifaddr **ifap = NULL; | |
592 | struct in_ifaddr *ifa = NULL; | |
593 | struct net_device *dev; | |
594 | char *colon; | |
595 | int ret = -EFAULT; | |
596 | int tryaddrmatch = 0; | |
597 | ||
598 | /* | |
599 | * Fetch the caller's info block into kernel space | |
600 | */ | |
601 | ||
602 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
603 | goto out; | |
604 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
605 | ||
606 | /* save original address for comparison */ | |
607 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
608 | ||
609 | colon = strchr(ifr.ifr_name, ':'); | |
610 | if (colon) | |
611 | *colon = 0; | |
612 | ||
e5b13cb1 | 613 | dev_load(net, ifr.ifr_name); |
1da177e4 | 614 | |
132adf54 | 615 | switch (cmd) { |
1da177e4 LT |
616 | case SIOCGIFADDR: /* Get interface address */ |
617 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
618 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
619 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
620 | /* Note that these ioctls will not sleep, | |
621 | so that we do not impose a lock. | |
622 | One day we will be forced to put shlock here (I mean SMP) | |
623 | */ | |
624 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
625 | memset(sin, 0, sizeof(*sin)); | |
626 | sin->sin_family = AF_INET; | |
627 | break; | |
628 | ||
629 | case SIOCSIFFLAGS: | |
630 | ret = -EACCES; | |
631 | if (!capable(CAP_NET_ADMIN)) | |
632 | goto out; | |
633 | break; | |
634 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
635 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
636 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
637 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
638 | ret = -EACCES; | |
639 | if (!capable(CAP_NET_ADMIN)) | |
640 | goto out; | |
641 | ret = -EINVAL; | |
642 | if (sin->sin_family != AF_INET) | |
643 | goto out; | |
644 | break; | |
645 | default: | |
646 | ret = -EINVAL; | |
647 | goto out; | |
648 | } | |
649 | ||
650 | rtnl_lock(); | |
651 | ||
652 | ret = -ENODEV; | |
9f9354b9 ED |
653 | dev = __dev_get_by_name(net, ifr.ifr_name); |
654 | if (!dev) | |
1da177e4 LT |
655 | goto done; |
656 | ||
657 | if (colon) | |
658 | *colon = ':'; | |
659 | ||
9f9354b9 ED |
660 | in_dev = __in_dev_get_rtnl(dev); |
661 | if (in_dev) { | |
1da177e4 LT |
662 | if (tryaddrmatch) { |
663 | /* Matthias Andree */ | |
664 | /* compare label and address (4.4BSD style) */ | |
665 | /* note: we only do this for a limited set of ioctls | |
666 | and only if the original address family was AF_INET. | |
667 | This is checked above. */ | |
668 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
669 | ifap = &ifa->ifa_next) { | |
670 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
671 | sin_orig.sin_addr.s_addr == | |
672 | ifa->ifa_address) { | |
673 | break; /* found */ | |
674 | } | |
675 | } | |
676 | } | |
677 | /* we didn't get a match, maybe the application is | |
678 | 4.3BSD-style and passed in junk so we fall back to | |
679 | comparing just the label */ | |
680 | if (!ifa) { | |
681 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
682 | ifap = &ifa->ifa_next) | |
683 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
684 | break; | |
685 | } | |
686 | } | |
687 | ||
688 | ret = -EADDRNOTAVAIL; | |
689 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
690 | goto done; | |
691 | ||
132adf54 | 692 | switch (cmd) { |
1da177e4 LT |
693 | case SIOCGIFADDR: /* Get interface address */ |
694 | sin->sin_addr.s_addr = ifa->ifa_local; | |
695 | goto rarok; | |
696 | ||
697 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
698 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
699 | goto rarok; | |
700 | ||
701 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
702 | sin->sin_addr.s_addr = ifa->ifa_address; | |
703 | goto rarok; | |
704 | ||
705 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
706 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
707 | goto rarok; | |
708 | ||
709 | case SIOCSIFFLAGS: | |
710 | if (colon) { | |
711 | ret = -EADDRNOTAVAIL; | |
712 | if (!ifa) | |
713 | break; | |
714 | ret = 0; | |
715 | if (!(ifr.ifr_flags & IFF_UP)) | |
716 | inet_del_ifa(in_dev, ifap, 1); | |
717 | break; | |
718 | } | |
719 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
720 | break; | |
721 | ||
722 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
723 | ret = -EINVAL; | |
724 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
725 | break; | |
726 | ||
727 | if (!ifa) { | |
728 | ret = -ENOBUFS; | |
9f9354b9 ED |
729 | ifa = inet_alloc_ifa(); |
730 | if (!ifa) | |
1da177e4 LT |
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 | ||
9f9354b9 | 832 | if (!in_dev) |
1da177e4 LT |
833 | goto out; |
834 | ||
9f9354b9 | 835 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1da177e4 LT |
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); | |
1da177e4 LT |
885 | |
886 | if (addr) | |
c6d14c84 | 887 | goto out_unlock; |
9f9354b9 | 888 | no_in_dev: |
1da177e4 LT |
889 | |
890 | /* Not loopback addresses on loopback should be preferred | |
891 | in this case. It is importnat that lo is the first interface | |
892 | in dev_base list. | |
893 | */ | |
c6d14c84 | 894 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
895 | in_dev = __in_dev_get_rcu(dev); |
896 | if (!in_dev) | |
1da177e4 LT |
897 | continue; |
898 | ||
899 | for_primary_ifa(in_dev) { | |
900 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
901 | ifa->ifa_scope <= scope) { | |
902 | addr = ifa->ifa_local; | |
c6d14c84 | 903 | goto out_unlock; |
1da177e4 LT |
904 | } |
905 | } endfor_ifa(in_dev); | |
906 | } | |
c6d14c84 | 907 | out_unlock: |
1da177e4 | 908 | rcu_read_unlock(); |
1da177e4 LT |
909 | return addr; |
910 | } | |
9f9354b9 | 911 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 912 | |
60cad5da AV |
913 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
914 | __be32 local, int scope) | |
1da177e4 LT |
915 | { |
916 | int same = 0; | |
a144ea4b | 917 | __be32 addr = 0; |
1da177e4 LT |
918 | |
919 | for_ifa(in_dev) { | |
920 | if (!addr && | |
921 | (local == ifa->ifa_local || !local) && | |
922 | ifa->ifa_scope <= scope) { | |
923 | addr = ifa->ifa_local; | |
924 | if (same) | |
925 | break; | |
926 | } | |
927 | if (!same) { | |
928 | same = (!local || inet_ifa_match(local, ifa)) && | |
929 | (!dst || inet_ifa_match(dst, ifa)); | |
930 | if (same && addr) { | |
931 | if (local || !dst) | |
932 | break; | |
933 | /* Is the selected addr into dst subnet? */ | |
934 | if (inet_ifa_match(addr, ifa)) | |
935 | break; | |
936 | /* No, then can we use new local src? */ | |
937 | if (ifa->ifa_scope <= scope) { | |
938 | addr = ifa->ifa_local; | |
939 | break; | |
940 | } | |
941 | /* search for large dst subnet for addr */ | |
942 | same = 0; | |
943 | } | |
944 | } | |
945 | } endfor_ifa(in_dev); | |
946 | ||
9f9354b9 | 947 | return same ? addr : 0; |
1da177e4 LT |
948 | } |
949 | ||
950 | /* | |
951 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 952 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
953 | * - dst: only in the same subnet as dst, 0=any dst |
954 | * - local: address, 0=autoselect the local address | |
955 | * - scope: maximum allowed scope value for the local address | |
956 | */ | |
9bd85e32 DL |
957 | __be32 inet_confirm_addr(struct in_device *in_dev, |
958 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 959 | { |
60cad5da | 960 | __be32 addr = 0; |
9bd85e32 | 961 | struct net_device *dev; |
39a6d063 | 962 | struct net *net; |
1da177e4 | 963 | |
39a6d063 | 964 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 965 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 966 | |
c346dca1 | 967 | net = dev_net(in_dev->dev); |
1da177e4 | 968 | rcu_read_lock(); |
c6d14c84 | 969 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
970 | in_dev = __in_dev_get_rcu(dev); |
971 | if (in_dev) { | |
1da177e4 LT |
972 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
973 | if (addr) | |
974 | break; | |
975 | } | |
976 | } | |
977 | rcu_read_unlock(); | |
1da177e4 LT |
978 | |
979 | return addr; | |
980 | } | |
981 | ||
982 | /* | |
983 | * Device notifier | |
984 | */ | |
985 | ||
986 | int register_inetaddr_notifier(struct notifier_block *nb) | |
987 | { | |
e041c683 | 988 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 989 | } |
9f9354b9 | 990 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
991 | |
992 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
993 | { | |
e041c683 | 994 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 995 | } |
9f9354b9 | 996 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 997 | |
9f9354b9 ED |
998 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
999 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
1000 | */ |
1001 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1002 | { |
1da177e4 LT |
1003 | struct in_ifaddr *ifa; |
1004 | int named = 0; | |
1005 | ||
e905a9ed YH |
1006 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1007 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1008 | |
1009 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1010 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1011 | if (named++ == 0) |
573bf470 | 1012 | goto skip; |
44344b2a | 1013 | dot = strchr(old, ':'); |
e905a9ed YH |
1014 | if (dot == NULL) { |
1015 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1016 | dot = old; |
1017 | } | |
9f9354b9 | 1018 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1019 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1020 | else |
e905a9ed | 1021 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1022 | skip: |
1023 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1024 | } |
1025 | } | |
1da177e4 | 1026 | |
06770843 BL |
1027 | static inline bool inetdev_valid_mtu(unsigned mtu) |
1028 | { | |
1029 | return mtu >= 68; | |
1030 | } | |
1031 | ||
1da177e4 LT |
1032 | /* Called only under RTNL semaphore */ |
1033 | ||
1034 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1035 | void *ptr) | |
1036 | { | |
1037 | struct net_device *dev = ptr; | |
e5ed6399 | 1038 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1039 | |
1040 | ASSERT_RTNL(); | |
1041 | ||
1042 | if (!in_dev) { | |
8030f544 | 1043 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1044 | in_dev = inetdev_init(dev); |
b217d616 HX |
1045 | if (!in_dev) |
1046 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1047 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1048 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1049 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1050 | } |
06770843 BL |
1051 | } else if (event == NETDEV_CHANGEMTU) { |
1052 | /* Re-enabling IP */ | |
1053 | if (inetdev_valid_mtu(dev->mtu)) | |
1054 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1055 | } |
1056 | goto out; | |
1057 | } | |
1058 | ||
1059 | switch (event) { | |
1060 | case NETDEV_REGISTER: | |
1061 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1062 | dev->ip_ptr = NULL; | |
1063 | break; | |
1064 | case NETDEV_UP: | |
06770843 | 1065 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1066 | break; |
0cc217e1 | 1067 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1068 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1069 | ||
1070 | if (ifa) { | |
1da177e4 LT |
1071 | ifa->ifa_local = |
1072 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1073 | ifa->ifa_prefixlen = 8; | |
1074 | ifa->ifa_mask = inet_make_mask(8); | |
1075 | in_dev_hold(in_dev); | |
1076 | ifa->ifa_dev = in_dev; | |
1077 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1078 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1079 | inet_insert_ifa(ifa); | |
1080 | } | |
1081 | } | |
1082 | ip_mc_up(in_dev); | |
eefef1cf SH |
1083 | /* fall through */ |
1084 | case NETDEV_CHANGEADDR: | |
a21090cf SH |
1085 | /* Send gratuitous ARP to notify of link change */ |
1086 | if (IN_DEV_ARP_NOTIFY(in_dev)) { | |
1087 | struct in_ifaddr *ifa = in_dev->ifa_list; | |
1088 | ||
1089 | if (ifa) | |
1090 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1091 | ifa->ifa_address, dev, | |
1092 | ifa->ifa_address, NULL, | |
1093 | dev->dev_addr, NULL); | |
1094 | } | |
1da177e4 LT |
1095 | break; |
1096 | case NETDEV_DOWN: | |
1097 | ip_mc_down(in_dev); | |
1098 | break; | |
93d9b7d7 | 1099 | case NETDEV_PRE_TYPE_CHANGE: |
75c78500 MS |
1100 | ip_mc_unmap(in_dev); |
1101 | break; | |
93d9b7d7 | 1102 | case NETDEV_POST_TYPE_CHANGE: |
75c78500 MS |
1103 | ip_mc_remap(in_dev); |
1104 | break; | |
1da177e4 | 1105 | case NETDEV_CHANGEMTU: |
06770843 | 1106 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1107 | break; |
06770843 | 1108 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1109 | case NETDEV_UNREGISTER: |
1110 | inetdev_destroy(in_dev); | |
1111 | break; | |
1112 | case NETDEV_CHANGENAME: | |
1113 | /* Do not notify about label change, this event is | |
1114 | * not interesting to applications using netlink. | |
1115 | */ | |
1116 | inetdev_changename(dev, in_dev); | |
1117 | ||
51602b2a | 1118 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1119 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1120 | break; |
1121 | } | |
1122 | out: | |
1123 | return NOTIFY_DONE; | |
1124 | } | |
1125 | ||
1126 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1127 | .notifier_call = inetdev_event, |
1da177e4 LT |
1128 | }; |
1129 | ||
339bf98f TG |
1130 | static inline size_t inet_nlmsg_size(void) |
1131 | { | |
1132 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1133 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1134 | + nla_total_size(4) /* IFA_LOCAL */ | |
1135 | + nla_total_size(4) /* IFA_BROADCAST */ | |
339bf98f TG |
1136 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ |
1137 | } | |
1138 | ||
1da177e4 | 1139 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1140 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1141 | { |
1142 | struct ifaddrmsg *ifm; | |
1143 | struct nlmsghdr *nlh; | |
1da177e4 | 1144 | |
47f68512 TG |
1145 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1146 | if (nlh == NULL) | |
26932566 | 1147 | return -EMSGSIZE; |
47f68512 TG |
1148 | |
1149 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1150 | ifm->ifa_family = AF_INET; |
1151 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1152 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1153 | ifm->ifa_scope = ifa->ifa_scope; | |
1154 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1155 | |
1da177e4 | 1156 | if (ifa->ifa_address) |
a7a628c4 | 1157 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1158 | |
1da177e4 | 1159 | if (ifa->ifa_local) |
a7a628c4 | 1160 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1161 | |
1da177e4 | 1162 | if (ifa->ifa_broadcast) |
a7a628c4 | 1163 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1164 | |
1da177e4 | 1165 | if (ifa->ifa_label[0]) |
47f68512 | 1166 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1167 | |
47f68512 TG |
1168 | return nlmsg_end(skb, nlh); |
1169 | ||
1170 | nla_put_failure: | |
26932566 PM |
1171 | nlmsg_cancel(skb, nlh); |
1172 | return -EMSGSIZE; | |
1da177e4 LT |
1173 | } |
1174 | ||
1175 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1176 | { | |
3b1e0a65 | 1177 | struct net *net = sock_net(skb->sk); |
eec4df98 ED |
1178 | int h, s_h; |
1179 | int idx, s_idx; | |
1180 | int ip_idx, s_ip_idx; | |
1da177e4 LT |
1181 | struct net_device *dev; |
1182 | struct in_device *in_dev; | |
1183 | struct in_ifaddr *ifa; | |
eec4df98 ED |
1184 | struct hlist_head *head; |
1185 | struct hlist_node *node; | |
1da177e4 | 1186 | |
eec4df98 ED |
1187 | s_h = cb->args[0]; |
1188 | s_idx = idx = cb->args[1]; | |
1189 | s_ip_idx = ip_idx = cb->args[2]; | |
1190 | ||
1191 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1192 | idx = 0; | |
1193 | head = &net->dev_index_head[h]; | |
1194 | rcu_read_lock(); | |
1195 | hlist_for_each_entry_rcu(dev, node, head, index_hlist) { | |
1196 | if (idx < s_idx) | |
1197 | goto cont; | |
4b97efdf | 1198 | if (h > s_h || idx > s_idx) |
eec4df98 ED |
1199 | s_ip_idx = 0; |
1200 | in_dev = __in_dev_get_rcu(dev); | |
1201 | if (!in_dev) | |
1202 | goto cont; | |
1da177e4 | 1203 | |
eec4df98 ED |
1204 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; |
1205 | ifa = ifa->ifa_next, ip_idx++) { | |
1206 | if (ip_idx < s_ip_idx) | |
1207 | continue; | |
1208 | if (inet_fill_ifaddr(skb, ifa, | |
1209 | NETLINK_CB(cb->skb).pid, | |
1da177e4 | 1210 | cb->nlh->nlmsg_seq, |
eec4df98 ED |
1211 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1212 | rcu_read_unlock(); | |
1213 | goto done; | |
1214 | } | |
1215 | } | |
7562f876 | 1216 | cont: |
eec4df98 ED |
1217 | idx++; |
1218 | } | |
1219 | rcu_read_unlock(); | |
1da177e4 LT |
1220 | } |
1221 | ||
1222 | done: | |
eec4df98 ED |
1223 | cb->args[0] = h; |
1224 | cb->args[1] = idx; | |
1225 | cb->args[2] = ip_idx; | |
1da177e4 LT |
1226 | |
1227 | return skb->len; | |
1228 | } | |
1229 | ||
539afedf | 1230 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
d6062cbb | 1231 | u32 pid) |
1da177e4 | 1232 | { |
47f68512 | 1233 | struct sk_buff *skb; |
d6062cbb TG |
1234 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1235 | int err = -ENOBUFS; | |
4b8aa9ab | 1236 | struct net *net; |
1da177e4 | 1237 | |
c346dca1 | 1238 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1239 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1240 | if (skb == NULL) |
d6062cbb TG |
1241 | goto errout; |
1242 | ||
1243 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1244 | if (err < 0) { |
1245 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1246 | WARN_ON(err == -EMSGSIZE); | |
1247 | kfree_skb(skb); | |
1248 | goto errout; | |
1249 | } | |
1ce85fe4 PNA |
1250 | rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1251 | return; | |
d6062cbb TG |
1252 | errout: |
1253 | if (err < 0) | |
4b8aa9ab | 1254 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1255 | } |
1256 | ||
1da177e4 LT |
1257 | #ifdef CONFIG_SYSCTL |
1258 | ||
c0ce9fb3 | 1259 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1260 | { |
1261 | struct net_device *dev; | |
1262 | ||
c6d14c84 ED |
1263 | rcu_read_lock(); |
1264 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 1265 | struct in_device *in_dev; |
c6d14c84 | 1266 | |
31be3085 HX |
1267 | in_dev = __in_dev_get_rcu(dev); |
1268 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1269 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 1270 | } |
c6d14c84 | 1271 | rcu_read_unlock(); |
31be3085 HX |
1272 | } |
1273 | ||
c6d14c84 | 1274 | /* called with RTNL locked */ |
c0ce9fb3 | 1275 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1276 | { |
1277 | struct net_device *dev; | |
586f1211 | 1278 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1279 | |
586f1211 | 1280 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1281 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
68dd299b | 1282 | |
c0ce9fb3 | 1283 | for_each_netdev(net, dev) { |
68dd299b | 1284 | struct in_device *in_dev; |
0187bdfb BH |
1285 | if (on) |
1286 | dev_disable_lro(dev); | |
68dd299b PE |
1287 | rcu_read_lock(); |
1288 | in_dev = __in_dev_get_rcu(dev); | |
1289 | if (in_dev) | |
1290 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1291 | rcu_read_unlock(); | |
1292 | } | |
68dd299b PE |
1293 | } |
1294 | ||
31be3085 | 1295 | static int devinet_conf_proc(ctl_table *ctl, int write, |
8d65af78 | 1296 | void __user *buffer, |
31be3085 HX |
1297 | size_t *lenp, loff_t *ppos) |
1298 | { | |
8d65af78 | 1299 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
31be3085 HX |
1300 | |
1301 | if (write) { | |
1302 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1303 | struct net *net = ctl->extra2; |
31be3085 HX |
1304 | int i = (int *)ctl->data - cnf->data; |
1305 | ||
1306 | set_bit(i, cnf->state); | |
1307 | ||
9355bbd6 | 1308 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1309 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1310 | } |
1311 | ||
1312 | return ret; | |
1313 | } | |
1314 | ||
1da177e4 | 1315 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
8d65af78 | 1316 | void __user *buffer, |
1da177e4 LT |
1317 | size_t *lenp, loff_t *ppos) |
1318 | { | |
1319 | int *valp = ctl->data; | |
1320 | int val = *valp; | |
88af182e | 1321 | loff_t pos = *ppos; |
8d65af78 | 1322 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
1323 | |
1324 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1325 | struct net *net = ctl->extra2; |
1326 | ||
0187bdfb | 1327 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
88af182e EB |
1328 | if (!rtnl_trylock()) { |
1329 | /* Restore the original values before restarting */ | |
1330 | *valp = val; | |
1331 | *ppos = pos; | |
9b8adb5e | 1332 | return restart_syscall(); |
88af182e | 1333 | } |
0187bdfb BH |
1334 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
1335 | inet_forward_change(net); | |
1336 | } else if (*valp) { | |
1337 | struct ipv4_devconf *cnf = ctl->extra1; | |
1338 | struct in_device *idev = | |
1339 | container_of(cnf, struct in_device, cnf); | |
1340 | dev_disable_lro(idev->dev); | |
1341 | } | |
1342 | rtnl_unlock(); | |
76e6ebfb | 1343 | rt_cache_flush(net, 0); |
0187bdfb | 1344 | } |
1da177e4 LT |
1345 | } |
1346 | ||
1347 | return ret; | |
1348 | } | |
1349 | ||
1350 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
8d65af78 | 1351 | void __user *buffer, |
1da177e4 LT |
1352 | size_t *lenp, loff_t *ppos) |
1353 | { | |
1354 | int *valp = ctl->data; | |
1355 | int val = *valp; | |
8d65af78 | 1356 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 1357 | struct net *net = ctl->extra2; |
1da177e4 LT |
1358 | |
1359 | if (write && *valp != val) | |
76e6ebfb | 1360 | rt_cache_flush(net, 0); |
1da177e4 LT |
1361 | |
1362 | return ret; | |
1363 | } | |
1364 | ||
f8572d8f | 1365 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 1366 | { \ |
42f811b8 HX |
1367 | .procname = name, \ |
1368 | .data = ipv4_devconf.data + \ | |
02291680 | 1369 | IPV4_DEVCONF_ ## attr - 1, \ |
42f811b8 HX |
1370 | .maxlen = sizeof(int), \ |
1371 | .mode = mval, \ | |
1372 | .proc_handler = proc, \ | |
31be3085 | 1373 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1374 | } |
1375 | ||
1376 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 1377 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
1378 | |
1379 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 1380 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 1381 | |
f8572d8f EB |
1382 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
1383 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
1384 | |
1385 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 1386 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 1387 | |
1da177e4 LT |
1388 | static struct devinet_sysctl_table { |
1389 | struct ctl_table_header *sysctl_header; | |
02291680 | 1390 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; |
bfada697 | 1391 | char *dev_name; |
1da177e4 LT |
1392 | } devinet_sysctl = { |
1393 | .devinet_vars = { | |
42f811b8 | 1394 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 1395 | devinet_sysctl_forward), |
42f811b8 HX |
1396 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1397 | ||
1398 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1399 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1400 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1401 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1402 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1403 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1404 | "accept_source_route"), | |
8153a10c | 1405 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
28f6aeea | 1406 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), |
42f811b8 HX |
1407 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
1408 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1409 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1410 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1411 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1412 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1413 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1414 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1415 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 1416 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
65324144 | 1417 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
42f811b8 HX |
1418 | |
1419 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1420 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1421 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1422 | "force_igmp_version"), | |
1423 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1424 | "promote_secondaries"), | |
1da177e4 | 1425 | }, |
1da177e4 LT |
1426 | }; |
1427 | ||
ea40b324 | 1428 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
f8572d8f | 1429 | struct ipv4_devconf *p) |
1da177e4 LT |
1430 | { |
1431 | int i; | |
9fa89642 | 1432 | struct devinet_sysctl_table *t; |
1da177e4 | 1433 | |
bfada697 PE |
1434 | #define DEVINET_CTL_PATH_DEV 3 |
1435 | ||
1436 | struct ctl_path devinet_ctl_path[] = { | |
f8572d8f EB |
1437 | { .procname = "net", }, |
1438 | { .procname = "ipv4", }, | |
1439 | { .procname = "conf", }, | |
bfada697 PE |
1440 | { /* to be set */ }, |
1441 | { }, | |
1442 | }; | |
1443 | ||
9fa89642 | 1444 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1445 | if (!t) |
9fa89642 PE |
1446 | goto out; |
1447 | ||
1da177e4 LT |
1448 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1449 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1450 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1451 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1452 | } |
1453 | ||
e905a9ed YH |
1454 | /* |
1455 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1456 | * by sysctl and we wouldn't want anyone to change it under our feet |
1457 | * (see SIOCSIFNAME). | |
e905a9ed | 1458 | */ |
bfada697 PE |
1459 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1460 | if (!t->dev_name) | |
9fa89642 | 1461 | goto free; |
1da177e4 | 1462 | |
bfada697 | 1463 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1da177e4 | 1464 | |
752d14dc | 1465 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, |
bfada697 | 1466 | t->devinet_vars); |
1da177e4 | 1467 | if (!t->sysctl_header) |
9fa89642 | 1468 | goto free_procname; |
1da177e4 LT |
1469 | |
1470 | p->sysctl = t; | |
ea40b324 | 1471 | return 0; |
1da177e4 | 1472 | |
9fa89642 | 1473 | free_procname: |
bfada697 | 1474 | kfree(t->dev_name); |
9fa89642 | 1475 | free: |
1da177e4 | 1476 | kfree(t); |
9fa89642 | 1477 | out: |
ea40b324 | 1478 | return -ENOBUFS; |
1da177e4 LT |
1479 | } |
1480 | ||
51602b2a PE |
1481 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1482 | { | |
1483 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1484 | ||
1485 | if (t == NULL) | |
1486 | return; | |
1487 | ||
1488 | cnf->sysctl = NULL; | |
1489 | unregister_sysctl_table(t->sysctl_header); | |
1490 | kfree(t->dev_name); | |
1491 | kfree(t); | |
1492 | } | |
1493 | ||
66f27a52 PE |
1494 | static void devinet_sysctl_register(struct in_device *idev) |
1495 | { | |
54716e3b | 1496 | neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL); |
c346dca1 | 1497 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, |
f8572d8f | 1498 | &idev->cnf); |
66f27a52 PE |
1499 | } |
1500 | ||
51602b2a | 1501 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1502 | { |
51602b2a PE |
1503 | __devinet_sysctl_unregister(&idev->cnf); |
1504 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 1505 | } |
1da177e4 | 1506 | |
68dd299b PE |
1507 | static struct ctl_table ctl_forward_entry[] = { |
1508 | { | |
68dd299b PE |
1509 | .procname = "ip_forward", |
1510 | .data = &ipv4_devconf.data[ | |
02291680 | 1511 | IPV4_DEVCONF_FORWARDING - 1], |
68dd299b PE |
1512 | .maxlen = sizeof(int), |
1513 | .mode = 0644, | |
1514 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 1515 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 1516 | .extra2 = &init_net, |
68dd299b PE |
1517 | }, |
1518 | { }, | |
1519 | }; | |
1520 | ||
752d14dc | 1521 | static __net_initdata struct ctl_path net_ipv4_path[] = { |
f8572d8f EB |
1522 | { .procname = "net", }, |
1523 | { .procname = "ipv4", }, | |
68dd299b PE |
1524 | { }, |
1525 | }; | |
2a75de0c | 1526 | #endif |
68dd299b | 1527 | |
752d14dc PE |
1528 | static __net_init int devinet_init_net(struct net *net) |
1529 | { | |
1530 | int err; | |
752d14dc | 1531 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
1532 | #ifdef CONFIG_SYSCTL |
1533 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 1534 | struct ctl_table_header *forw_hdr; |
2a75de0c | 1535 | #endif |
752d14dc PE |
1536 | |
1537 | err = -ENOMEM; | |
1538 | all = &ipv4_devconf; | |
1539 | dflt = &ipv4_devconf_dflt; | |
752d14dc | 1540 | |
09ad9bc7 | 1541 | if (!net_eq(net, &init_net)) { |
752d14dc PE |
1542 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); |
1543 | if (all == NULL) | |
1544 | goto err_alloc_all; | |
1545 | ||
1546 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1547 | if (dflt == NULL) | |
1548 | goto err_alloc_dflt; | |
1549 | ||
2a75de0c | 1550 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1551 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
1552 | if (tbl == NULL) | |
1553 | goto err_alloc_ctl; | |
1554 | ||
02291680 | 1555 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; |
752d14dc PE |
1556 | tbl[0].extra1 = all; |
1557 | tbl[0].extra2 = net; | |
2a75de0c | 1558 | #endif |
752d14dc PE |
1559 | } |
1560 | ||
1561 | #ifdef CONFIG_SYSCTL | |
f8572d8f | 1562 | err = __devinet_sysctl_register(net, "all", all); |
752d14dc PE |
1563 | if (err < 0) |
1564 | goto err_reg_all; | |
1565 | ||
f8572d8f | 1566 | err = __devinet_sysctl_register(net, "default", dflt); |
752d14dc PE |
1567 | if (err < 0) |
1568 | goto err_reg_dflt; | |
1569 | ||
1570 | err = -ENOMEM; | |
1571 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1572 | if (forw_hdr == NULL) | |
1573 | goto err_reg_ctl; | |
2a75de0c | 1574 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
1575 | #endif |
1576 | ||
752d14dc PE |
1577 | net->ipv4.devconf_all = all; |
1578 | net->ipv4.devconf_dflt = dflt; | |
1579 | return 0; | |
1580 | ||
1581 | #ifdef CONFIG_SYSCTL | |
1582 | err_reg_ctl: | |
1583 | __devinet_sysctl_unregister(dflt); | |
1584 | err_reg_dflt: | |
1585 | __devinet_sysctl_unregister(all); | |
1586 | err_reg_all: | |
1587 | if (tbl != ctl_forward_entry) | |
1588 | kfree(tbl); | |
752d14dc | 1589 | err_alloc_ctl: |
2a75de0c | 1590 | #endif |
752d14dc PE |
1591 | if (dflt != &ipv4_devconf_dflt) |
1592 | kfree(dflt); | |
1593 | err_alloc_dflt: | |
1594 | if (all != &ipv4_devconf) | |
1595 | kfree(all); | |
1596 | err_alloc_all: | |
1597 | return err; | |
1598 | } | |
1599 | ||
1600 | static __net_exit void devinet_exit_net(struct net *net) | |
1601 | { | |
2a75de0c | 1602 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1603 | struct ctl_table *tbl; |
1604 | ||
1605 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
1606 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
1607 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1608 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 1609 | kfree(tbl); |
2a75de0c | 1610 | #endif |
752d14dc PE |
1611 | kfree(net->ipv4.devconf_dflt); |
1612 | kfree(net->ipv4.devconf_all); | |
1613 | } | |
1614 | ||
1615 | static __net_initdata struct pernet_operations devinet_ops = { | |
1616 | .init = devinet_init_net, | |
1617 | .exit = devinet_exit_net, | |
1618 | }; | |
1619 | ||
1da177e4 LT |
1620 | void __init devinet_init(void) |
1621 | { | |
752d14dc PE |
1622 | register_pernet_subsys(&devinet_ops); |
1623 | ||
1da177e4 LT |
1624 | register_gifconf(PF_INET, inet_gifconf); |
1625 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f TG |
1626 | |
1627 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1628 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1629 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 LT |
1630 | } |
1631 |