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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 | { | |
93adcc80 | 115 | return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); |
1da177e4 LT |
116 | } |
117 | ||
118 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
119 | { | |
120 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
121 | if (ifa->ifa_dev) | |
122 | in_dev_put(ifa->ifa_dev); | |
123 | kfree(ifa); | |
124 | } | |
125 | ||
126 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
127 | { | |
128 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
129 | } | |
130 | ||
131 | void in_dev_finish_destroy(struct in_device *idev) | |
132 | { | |
133 | struct net_device *dev = idev->dev; | |
134 | ||
547b792c IJ |
135 | WARN_ON(idev->ifa_list); |
136 | WARN_ON(idev->mc_list); | |
1da177e4 LT |
137 | #ifdef NET_REFCNT_DEBUG |
138 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
139 | idev, dev ? dev->name : "NIL"); | |
140 | #endif | |
141 | dev_put(dev); | |
142 | if (!idev->dead) | |
9f9354b9 ED |
143 | pr_err("Freeing alive in_device %p\n", idev); |
144 | else | |
1da177e4 | 145 | kfree(idev); |
1da177e4 | 146 | } |
9f9354b9 | 147 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1da177e4 | 148 | |
71e27da9 | 149 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
150 | { |
151 | struct in_device *in_dev; | |
152 | ||
153 | ASSERT_RTNL(); | |
154 | ||
0da974f4 | 155 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
156 | if (!in_dev) |
157 | goto out; | |
c346dca1 | 158 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 159 | sizeof(in_dev->cnf)); |
1da177e4 LT |
160 | in_dev->cnf.sysctl = NULL; |
161 | in_dev->dev = dev; | |
9f9354b9 ED |
162 | in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); |
163 | if (!in_dev->arp_parms) | |
1da177e4 | 164 | goto out_kfree; |
0187bdfb BH |
165 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
166 | dev_disable_lro(dev); | |
1da177e4 LT |
167 | /* Reference in_dev->dev */ |
168 | dev_hold(dev); | |
30c4cf57 | 169 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 170 | in_dev_hold(in_dev); |
1da177e4 | 171 | |
66f27a52 | 172 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
173 | ip_mc_init_dev(in_dev); |
174 | if (dev->flags & IFF_UP) | |
175 | ip_mc_up(in_dev); | |
483479ec | 176 | |
30c4cf57 DS |
177 | /* we can receive as soon as ip_ptr is set -- do this last */ |
178 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 179 | out: |
1da177e4 LT |
180 | return in_dev; |
181 | out_kfree: | |
182 | kfree(in_dev); | |
183 | in_dev = NULL; | |
184 | goto out; | |
185 | } | |
186 | ||
187 | static void in_dev_rcu_put(struct rcu_head *head) | |
188 | { | |
189 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
190 | in_dev_put(idev); | |
191 | } | |
192 | ||
193 | static void inetdev_destroy(struct in_device *in_dev) | |
194 | { | |
195 | struct in_ifaddr *ifa; | |
196 | struct net_device *dev; | |
197 | ||
198 | ASSERT_RTNL(); | |
199 | ||
200 | dev = in_dev->dev; | |
1da177e4 LT |
201 | |
202 | in_dev->dead = 1; | |
203 | ||
204 | ip_mc_destroy_dev(in_dev); | |
205 | ||
206 | while ((ifa = in_dev->ifa_list) != NULL) { | |
207 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
208 | inet_free_ifa(ifa); | |
209 | } | |
210 | ||
1da177e4 LT |
211 | dev->ip_ptr = NULL; |
212 | ||
51602b2a | 213 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
214 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
215 | arp_ifdown(dev); | |
216 | ||
217 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
218 | } | |
219 | ||
ff428d72 | 220 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
221 | { |
222 | rcu_read_lock(); | |
223 | for_primary_ifa(in_dev) { | |
224 | if (inet_ifa_match(a, ifa)) { | |
225 | if (!b || inet_ifa_match(b, ifa)) { | |
226 | rcu_read_unlock(); | |
227 | return 1; | |
228 | } | |
229 | } | |
230 | } endfor_ifa(in_dev); | |
231 | rcu_read_unlock(); | |
232 | return 0; | |
233 | } | |
234 | ||
d6062cbb TG |
235 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
236 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 237 | { |
8f937c60 | 238 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
239 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
240 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
241 | struct in_ifaddr *prev_prom = NULL; | |
242 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
243 | |
244 | ASSERT_RTNL(); | |
245 | ||
e905a9ed | 246 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
247 | * unless alias promotion is set |
248 | **/ | |
1da177e4 LT |
249 | |
250 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
251 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
252 | ||
253 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 254 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
255 | ifa1->ifa_scope <= ifa->ifa_scope) |
256 | last_prim = ifa; | |
257 | ||
1da177e4 LT |
258 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
259 | ifa1->ifa_mask != ifa->ifa_mask || | |
260 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
261 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 262 | prev_prom = ifa; |
1da177e4 LT |
263 | continue; |
264 | } | |
265 | ||
0ff60a45 | 266 | if (!do_promote) { |
8f937c60 | 267 | *ifap1 = ifa->ifa_next; |
1da177e4 | 268 | |
d6062cbb | 269 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
270 | blocking_notifier_call_chain(&inetaddr_chain, |
271 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
272 | inet_free_ifa(ifa); |
273 | } else { | |
274 | promote = ifa; | |
275 | break; | |
276 | } | |
1da177e4 LT |
277 | } |
278 | } | |
279 | ||
280 | /* 2. Unlink it */ | |
281 | ||
282 | *ifap = ifa1->ifa_next; | |
283 | ||
284 | /* 3. Announce address deletion */ | |
285 | ||
286 | /* Send message first, then call notifier. | |
287 | At first sight, FIB update triggered by notifier | |
288 | will refer to already deleted ifaddr, that could confuse | |
289 | netlink listeners. It is not true: look, gated sees | |
290 | that route deleted and if it still thinks that ifaddr | |
291 | is valid, it will try to restore deleted routes... Grr. | |
292 | So that, this order is correct. | |
293 | */ | |
d6062cbb | 294 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 295 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 296 | |
0ff60a45 JHS |
297 | if (promote) { |
298 | ||
299 | if (prev_prom) { | |
300 | prev_prom->ifa_next = promote->ifa_next; | |
301 | promote->ifa_next = last_prim->ifa_next; | |
302 | last_prim->ifa_next = promote; | |
303 | } | |
8f937c60 | 304 | |
8f937c60 | 305 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 306 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
307 | blocking_notifier_call_chain(&inetaddr_chain, |
308 | NETDEV_UP, promote); | |
0ff60a45 JHS |
309 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
310 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
311 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
312 | continue; | |
313 | fib_add_ifaddr(ifa); | |
314 | } | |
315 | ||
316 | } | |
6363097c | 317 | if (destroy) |
0ff60a45 | 318 | inet_free_ifa(ifa1); |
1da177e4 LT |
319 | } |
320 | ||
d6062cbb TG |
321 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
322 | int destroy) | |
323 | { | |
324 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
325 | } | |
326 | ||
327 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
328 | u32 pid) | |
1da177e4 LT |
329 | { |
330 | struct in_device *in_dev = ifa->ifa_dev; | |
331 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
332 | ||
333 | ASSERT_RTNL(); | |
334 | ||
335 | if (!ifa->ifa_local) { | |
336 | inet_free_ifa(ifa); | |
337 | return 0; | |
338 | } | |
339 | ||
340 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
341 | last_primary = &in_dev->ifa_list; | |
342 | ||
343 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
344 | ifap = &ifa1->ifa_next) { | |
345 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
346 | ifa->ifa_scope <= ifa1->ifa_scope) | |
347 | last_primary = &ifa1->ifa_next; | |
348 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
349 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
350 | if (ifa1->ifa_local == ifa->ifa_local) { | |
351 | inet_free_ifa(ifa); | |
352 | return -EEXIST; | |
353 | } | |
354 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
355 | inet_free_ifa(ifa); | |
356 | return -EINVAL; | |
357 | } | |
358 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
359 | } | |
360 | } | |
361 | ||
362 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
363 | net_srandom(ifa->ifa_local); | |
364 | ifap = last_primary; | |
365 | } | |
366 | ||
367 | ifa->ifa_next = *ifap; | |
368 | *ifap = ifa; | |
369 | ||
370 | /* Send message first, then call notifier. | |
371 | Notifier will trigger FIB update, so that | |
372 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 373 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 374 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
375 | |
376 | return 0; | |
377 | } | |
378 | ||
d6062cbb TG |
379 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
380 | { | |
381 | return __inet_insert_ifa(ifa, NULL, 0); | |
382 | } | |
383 | ||
1da177e4 LT |
384 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
385 | { | |
e5ed6399 | 386 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
387 | |
388 | ASSERT_RTNL(); | |
389 | ||
390 | if (!in_dev) { | |
71e27da9 HX |
391 | inet_free_ifa(ifa); |
392 | return -ENOBUFS; | |
1da177e4 | 393 | } |
71e27da9 | 394 | ipv4_devconf_setall(in_dev); |
1da177e4 | 395 | if (ifa->ifa_dev != in_dev) { |
547b792c | 396 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
397 | in_dev_hold(in_dev); |
398 | ifa->ifa_dev = in_dev; | |
399 | } | |
f97c1e0c | 400 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
401 | ifa->ifa_scope = RT_SCOPE_HOST; |
402 | return inet_insert_ifa(ifa); | |
403 | } | |
404 | ||
7fee0ca2 | 405 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
406 | { |
407 | struct net_device *dev; | |
408 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
409 | |
410 | rcu_read_lock(); | |
411 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
412 | if (dev) |
413 | in_dev = in_dev_get(dev); | |
c148fc2e | 414 | rcu_read_unlock(); |
1da177e4 LT |
415 | return in_dev; |
416 | } | |
9f9354b9 | 417 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
418 | |
419 | /* Called only from RTNL semaphored context. No locks. */ | |
420 | ||
60cad5da AV |
421 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
422 | __be32 mask) | |
1da177e4 LT |
423 | { |
424 | ASSERT_RTNL(); | |
425 | ||
426 | for_primary_ifa(in_dev) { | |
427 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
428 | return ifa; | |
429 | } endfor_ifa(in_dev); | |
430 | return NULL; | |
431 | } | |
432 | ||
433 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
434 | { | |
3b1e0a65 | 435 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 436 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 437 | struct in_device *in_dev; |
dfdd5fd4 | 438 | struct ifaddrmsg *ifm; |
1da177e4 | 439 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 440 | int err = -EINVAL; |
1da177e4 LT |
441 | |
442 | ASSERT_RTNL(); | |
443 | ||
dfdd5fd4 TG |
444 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
445 | if (err < 0) | |
446 | goto errout; | |
447 | ||
448 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 449 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
dfdd5fd4 TG |
450 | if (in_dev == NULL) { |
451 | err = -ENODEV; | |
452 | goto errout; | |
453 | } | |
454 | ||
1da177e4 LT |
455 | __in_dev_put(in_dev); |
456 | ||
457 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
458 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 459 | if (tb[IFA_LOCAL] && |
a7a628c4 | 460 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
461 | continue; |
462 | ||
463 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 464 | continue; |
dfdd5fd4 TG |
465 | |
466 | if (tb[IFA_ADDRESS] && | |
467 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 468 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
469 | continue; |
470 | ||
d6062cbb | 471 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
472 | return 0; |
473 | } | |
dfdd5fd4 TG |
474 | |
475 | err = -EADDRNOTAVAIL; | |
476 | errout: | |
477 | return err; | |
1da177e4 LT |
478 | } |
479 | ||
4b8aa9ab | 480 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) |
1da177e4 | 481 | { |
5c753978 TG |
482 | struct nlattr *tb[IFA_MAX+1]; |
483 | struct in_ifaddr *ifa; | |
484 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
485 | struct net_device *dev; |
486 | struct in_device *in_dev; | |
7b218574 | 487 | int err; |
1da177e4 | 488 | |
5c753978 TG |
489 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
490 | if (err < 0) | |
491 | goto errout; | |
1da177e4 | 492 | |
5c753978 | 493 | ifm = nlmsg_data(nlh); |
7b218574 DL |
494 | err = -EINVAL; |
495 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
5c753978 | 496 | goto errout; |
1da177e4 | 497 | |
4b8aa9ab | 498 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 DL |
499 | err = -ENODEV; |
500 | if (dev == NULL) | |
5c753978 | 501 | goto errout; |
1da177e4 | 502 | |
5c753978 | 503 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 DL |
504 | err = -ENOBUFS; |
505 | if (in_dev == NULL) | |
71e27da9 | 506 | goto errout; |
1da177e4 | 507 | |
5c753978 | 508 | ifa = inet_alloc_ifa(); |
7b218574 | 509 | if (ifa == NULL) |
5c753978 TG |
510 | /* |
511 | * A potential indev allocation can be left alive, it stays | |
512 | * assigned to its device and is destroy with it. | |
513 | */ | |
5c753978 | 514 | goto errout; |
5c753978 | 515 | |
a4e65d36 | 516 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
517 | in_dev_hold(in_dev); |
518 | ||
519 | if (tb[IFA_ADDRESS] == NULL) | |
520 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 521 | |
1da177e4 LT |
522 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
523 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
524 | ifa->ifa_flags = ifm->ifa_flags; |
525 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
526 | ifa->ifa_dev = in_dev; |
527 | ||
a7a628c4 AV |
528 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
529 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
530 | |
531 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 532 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 | 533 | |
5c753978 TG |
534 | if (tb[IFA_LABEL]) |
535 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
536 | else |
537 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
538 | ||
5c753978 TG |
539 | return ifa; |
540 | ||
541 | errout: | |
542 | return ERR_PTR(err); | |
543 | } | |
544 | ||
545 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
546 | { | |
3b1e0a65 | 547 | struct net *net = sock_net(skb->sk); |
5c753978 TG |
548 | struct in_ifaddr *ifa; |
549 | ||
550 | ASSERT_RTNL(); | |
551 | ||
4b8aa9ab | 552 | ifa = rtm_to_ifaddr(net, nlh); |
5c753978 TG |
553 | if (IS_ERR(ifa)) |
554 | return PTR_ERR(ifa); | |
555 | ||
d6062cbb | 556 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
557 | } |
558 | ||
559 | /* | |
560 | * Determine a default network mask, based on the IP address. | |
561 | */ | |
562 | ||
9f9354b9 | 563 | static inline int inet_abc_len(__be32 addr) |
1da177e4 LT |
564 | { |
565 | int rc = -1; /* Something else, probably a multicast. */ | |
566 | ||
f97c1e0c | 567 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 568 | rc = 0; |
1da177e4 | 569 | else { |
714e85be | 570 | __u32 haddr = ntohl(addr); |
1da177e4 | 571 | |
714e85be | 572 | if (IN_CLASSA(haddr)) |
1da177e4 | 573 | rc = 8; |
714e85be | 574 | else if (IN_CLASSB(haddr)) |
1da177e4 | 575 | rc = 16; |
714e85be | 576 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
577 | rc = 24; |
578 | } | |
579 | ||
e905a9ed | 580 | return rc; |
1da177e4 LT |
581 | } |
582 | ||
583 | ||
e5b13cb1 | 584 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
585 | { |
586 | struct ifreq ifr; | |
587 | struct sockaddr_in sin_orig; | |
588 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
589 | struct in_device *in_dev; | |
590 | struct in_ifaddr **ifap = NULL; | |
591 | struct in_ifaddr *ifa = NULL; | |
592 | struct net_device *dev; | |
593 | char *colon; | |
594 | int ret = -EFAULT; | |
595 | int tryaddrmatch = 0; | |
596 | ||
597 | /* | |
598 | * Fetch the caller's info block into kernel space | |
599 | */ | |
600 | ||
601 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
602 | goto out; | |
603 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
604 | ||
605 | /* save original address for comparison */ | |
606 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
607 | ||
608 | colon = strchr(ifr.ifr_name, ':'); | |
609 | if (colon) | |
610 | *colon = 0; | |
611 | ||
e5b13cb1 | 612 | dev_load(net, ifr.ifr_name); |
1da177e4 | 613 | |
132adf54 | 614 | switch (cmd) { |
1da177e4 LT |
615 | case SIOCGIFADDR: /* Get interface address */ |
616 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
617 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
618 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
619 | /* Note that these ioctls will not sleep, | |
620 | so that we do not impose a lock. | |
621 | One day we will be forced to put shlock here (I mean SMP) | |
622 | */ | |
623 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
624 | memset(sin, 0, sizeof(*sin)); | |
625 | sin->sin_family = AF_INET; | |
626 | break; | |
627 | ||
628 | case SIOCSIFFLAGS: | |
629 | ret = -EACCES; | |
630 | if (!capable(CAP_NET_ADMIN)) | |
631 | goto out; | |
632 | break; | |
633 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
634 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
635 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
636 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
637 | ret = -EACCES; | |
638 | if (!capable(CAP_NET_ADMIN)) | |
639 | goto out; | |
640 | ret = -EINVAL; | |
641 | if (sin->sin_family != AF_INET) | |
642 | goto out; | |
643 | break; | |
644 | default: | |
645 | ret = -EINVAL; | |
646 | goto out; | |
647 | } | |
648 | ||
649 | rtnl_lock(); | |
650 | ||
651 | ret = -ENODEV; | |
9f9354b9 ED |
652 | dev = __dev_get_by_name(net, ifr.ifr_name); |
653 | if (!dev) | |
1da177e4 LT |
654 | goto done; |
655 | ||
656 | if (colon) | |
657 | *colon = ':'; | |
658 | ||
9f9354b9 ED |
659 | in_dev = __in_dev_get_rtnl(dev); |
660 | if (in_dev) { | |
1da177e4 LT |
661 | if (tryaddrmatch) { |
662 | /* Matthias Andree */ | |
663 | /* compare label and address (4.4BSD style) */ | |
664 | /* note: we only do this for a limited set of ioctls | |
665 | and only if the original address family was AF_INET. | |
666 | This is checked above. */ | |
667 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
668 | ifap = &ifa->ifa_next) { | |
669 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
670 | sin_orig.sin_addr.s_addr == | |
671 | ifa->ifa_address) { | |
672 | break; /* found */ | |
673 | } | |
674 | } | |
675 | } | |
676 | /* we didn't get a match, maybe the application is | |
677 | 4.3BSD-style and passed in junk so we fall back to | |
678 | comparing just the label */ | |
679 | if (!ifa) { | |
680 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
681 | ifap = &ifa->ifa_next) | |
682 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
683 | break; | |
684 | } | |
685 | } | |
686 | ||
687 | ret = -EADDRNOTAVAIL; | |
688 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
689 | goto done; | |
690 | ||
132adf54 | 691 | switch (cmd) { |
1da177e4 LT |
692 | case SIOCGIFADDR: /* Get interface address */ |
693 | sin->sin_addr.s_addr = ifa->ifa_local; | |
694 | goto rarok; | |
695 | ||
696 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
697 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
698 | goto rarok; | |
699 | ||
700 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
701 | sin->sin_addr.s_addr = ifa->ifa_address; | |
702 | goto rarok; | |
703 | ||
704 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
705 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
706 | goto rarok; | |
707 | ||
708 | case SIOCSIFFLAGS: | |
709 | if (colon) { | |
710 | ret = -EADDRNOTAVAIL; | |
711 | if (!ifa) | |
712 | break; | |
713 | ret = 0; | |
714 | if (!(ifr.ifr_flags & IFF_UP)) | |
715 | inet_del_ifa(in_dev, ifap, 1); | |
716 | break; | |
717 | } | |
718 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
719 | break; | |
720 | ||
721 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
722 | ret = -EINVAL; | |
723 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
724 | break; | |
725 | ||
726 | if (!ifa) { | |
727 | ret = -ENOBUFS; | |
9f9354b9 ED |
728 | ifa = inet_alloc_ifa(); |
729 | if (!ifa) | |
1da177e4 LT |
730 | break; |
731 | if (colon) | |
732 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
733 | else | |
734 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
735 | } else { | |
736 | ret = 0; | |
737 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
738 | break; | |
739 | inet_del_ifa(in_dev, ifap, 0); | |
740 | ifa->ifa_broadcast = 0; | |
148f9729 | 741 | ifa->ifa_scope = 0; |
1da177e4 LT |
742 | } |
743 | ||
744 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
745 | ||
746 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
747 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
748 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
749 | if ((dev->flags & IFF_BROADCAST) && | |
750 | ifa->ifa_prefixlen < 31) | |
751 | ifa->ifa_broadcast = ifa->ifa_address | | |
752 | ~ifa->ifa_mask; | |
753 | } else { | |
754 | ifa->ifa_prefixlen = 32; | |
755 | ifa->ifa_mask = inet_make_mask(32); | |
756 | } | |
757 | ret = inet_set_ifa(dev, ifa); | |
758 | break; | |
759 | ||
760 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
761 | ret = 0; | |
762 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
763 | inet_del_ifa(in_dev, ifap, 0); | |
764 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
765 | inet_insert_ifa(ifa); | |
766 | } | |
767 | break; | |
768 | ||
769 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
770 | ret = 0; | |
771 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
772 | break; | |
773 | ret = -EINVAL; | |
774 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
775 | break; | |
776 | ret = 0; | |
777 | inet_del_ifa(in_dev, ifap, 0); | |
778 | ifa->ifa_address = sin->sin_addr.s_addr; | |
779 | inet_insert_ifa(ifa); | |
780 | break; | |
781 | ||
782 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
783 | ||
784 | /* | |
785 | * The mask we set must be legal. | |
786 | */ | |
787 | ret = -EINVAL; | |
788 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
789 | break; | |
790 | ret = 0; | |
791 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 792 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
793 | inet_del_ifa(in_dev, ifap, 0); |
794 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
795 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
796 | ||
797 | /* See if current broadcast address matches | |
798 | * with current netmask, then recalculate | |
799 | * the broadcast address. Otherwise it's a | |
800 | * funny address, so don't touch it since | |
801 | * the user seems to know what (s)he's doing... | |
802 | */ | |
803 | if ((dev->flags & IFF_BROADCAST) && | |
804 | (ifa->ifa_prefixlen < 31) && | |
805 | (ifa->ifa_broadcast == | |
dcab5e1e | 806 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
807 | ifa->ifa_broadcast = (ifa->ifa_local | |
808 | ~sin->sin_addr.s_addr); | |
809 | } | |
810 | inet_insert_ifa(ifa); | |
811 | } | |
812 | break; | |
813 | } | |
814 | done: | |
815 | rtnl_unlock(); | |
816 | out: | |
817 | return ret; | |
818 | rarok: | |
819 | rtnl_unlock(); | |
820 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
821 | goto out; | |
822 | } | |
823 | ||
824 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
825 | { | |
e5ed6399 | 826 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
827 | struct in_ifaddr *ifa; |
828 | struct ifreq ifr; | |
829 | int done = 0; | |
830 | ||
9f9354b9 | 831 | if (!in_dev) |
1da177e4 LT |
832 | goto out; |
833 | ||
9f9354b9 | 834 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1da177e4 LT |
835 | if (!buf) { |
836 | done += sizeof(ifr); | |
837 | continue; | |
838 | } | |
839 | if (len < (int) sizeof(ifr)) | |
840 | break; | |
841 | memset(&ifr, 0, sizeof(struct ifreq)); | |
842 | if (ifa->ifa_label) | |
843 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
844 | else | |
845 | strcpy(ifr.ifr_name, dev->name); | |
846 | ||
847 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
848 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
849 | ifa->ifa_local; | |
850 | ||
851 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
852 | done = -EFAULT; | |
853 | break; | |
854 | } | |
855 | buf += sizeof(struct ifreq); | |
856 | len -= sizeof(struct ifreq); | |
857 | done += sizeof(struct ifreq); | |
858 | } | |
859 | out: | |
860 | return done; | |
861 | } | |
862 | ||
a61ced5d | 863 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 864 | { |
a61ced5d | 865 | __be32 addr = 0; |
1da177e4 | 866 | struct in_device *in_dev; |
c346dca1 | 867 | struct net *net = dev_net(dev); |
1da177e4 LT |
868 | |
869 | rcu_read_lock(); | |
e5ed6399 | 870 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
871 | if (!in_dev) |
872 | goto no_in_dev; | |
873 | ||
874 | for_primary_ifa(in_dev) { | |
875 | if (ifa->ifa_scope > scope) | |
876 | continue; | |
877 | if (!dst || inet_ifa_match(dst, ifa)) { | |
878 | addr = ifa->ifa_local; | |
879 | break; | |
880 | } | |
881 | if (!addr) | |
882 | addr = ifa->ifa_local; | |
883 | } endfor_ifa(in_dev); | |
1da177e4 LT |
884 | |
885 | if (addr) | |
c6d14c84 | 886 | goto out_unlock; |
9f9354b9 | 887 | no_in_dev: |
1da177e4 LT |
888 | |
889 | /* Not loopback addresses on loopback should be preferred | |
890 | in this case. It is importnat that lo is the first interface | |
891 | in dev_base list. | |
892 | */ | |
c6d14c84 | 893 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
894 | in_dev = __in_dev_get_rcu(dev); |
895 | if (!in_dev) | |
1da177e4 LT |
896 | continue; |
897 | ||
898 | for_primary_ifa(in_dev) { | |
899 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
900 | ifa->ifa_scope <= scope) { | |
901 | addr = ifa->ifa_local; | |
c6d14c84 | 902 | goto out_unlock; |
1da177e4 LT |
903 | } |
904 | } endfor_ifa(in_dev); | |
905 | } | |
c6d14c84 | 906 | out_unlock: |
1da177e4 | 907 | rcu_read_unlock(); |
1da177e4 LT |
908 | return addr; |
909 | } | |
9f9354b9 | 910 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 911 | |
60cad5da AV |
912 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
913 | __be32 local, int scope) | |
1da177e4 LT |
914 | { |
915 | int same = 0; | |
a144ea4b | 916 | __be32 addr = 0; |
1da177e4 LT |
917 | |
918 | for_ifa(in_dev) { | |
919 | if (!addr && | |
920 | (local == ifa->ifa_local || !local) && | |
921 | ifa->ifa_scope <= scope) { | |
922 | addr = ifa->ifa_local; | |
923 | if (same) | |
924 | break; | |
925 | } | |
926 | if (!same) { | |
927 | same = (!local || inet_ifa_match(local, ifa)) && | |
928 | (!dst || inet_ifa_match(dst, ifa)); | |
929 | if (same && addr) { | |
930 | if (local || !dst) | |
931 | break; | |
932 | /* Is the selected addr into dst subnet? */ | |
933 | if (inet_ifa_match(addr, ifa)) | |
934 | break; | |
935 | /* No, then can we use new local src? */ | |
936 | if (ifa->ifa_scope <= scope) { | |
937 | addr = ifa->ifa_local; | |
938 | break; | |
939 | } | |
940 | /* search for large dst subnet for addr */ | |
941 | same = 0; | |
942 | } | |
943 | } | |
944 | } endfor_ifa(in_dev); | |
945 | ||
9f9354b9 | 946 | return same ? addr : 0; |
1da177e4 LT |
947 | } |
948 | ||
949 | /* | |
950 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 951 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
952 | * - dst: only in the same subnet as dst, 0=any dst |
953 | * - local: address, 0=autoselect the local address | |
954 | * - scope: maximum allowed scope value for the local address | |
955 | */ | |
9bd85e32 DL |
956 | __be32 inet_confirm_addr(struct in_device *in_dev, |
957 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 958 | { |
60cad5da | 959 | __be32 addr = 0; |
9bd85e32 | 960 | struct net_device *dev; |
39a6d063 | 961 | struct net *net; |
1da177e4 | 962 | |
39a6d063 | 963 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 964 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 965 | |
c346dca1 | 966 | net = dev_net(in_dev->dev); |
1da177e4 | 967 | rcu_read_lock(); |
c6d14c84 | 968 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
969 | in_dev = __in_dev_get_rcu(dev); |
970 | if (in_dev) { | |
1da177e4 LT |
971 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
972 | if (addr) | |
973 | break; | |
974 | } | |
975 | } | |
976 | rcu_read_unlock(); | |
1da177e4 LT |
977 | |
978 | return addr; | |
979 | } | |
980 | ||
981 | /* | |
982 | * Device notifier | |
983 | */ | |
984 | ||
985 | int register_inetaddr_notifier(struct notifier_block *nb) | |
986 | { | |
e041c683 | 987 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 988 | } |
9f9354b9 | 989 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
990 | |
991 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
992 | { | |
e041c683 | 993 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 994 | } |
9f9354b9 | 995 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 996 | |
9f9354b9 ED |
997 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
998 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
999 | */ |
1000 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1001 | { |
1da177e4 LT |
1002 | struct in_ifaddr *ifa; |
1003 | int named = 0; | |
1004 | ||
e905a9ed YH |
1005 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1006 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1007 | |
1008 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1009 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1010 | if (named++ == 0) |
573bf470 | 1011 | goto skip; |
44344b2a | 1012 | dot = strchr(old, ':'); |
e905a9ed YH |
1013 | if (dot == NULL) { |
1014 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1015 | dot = old; |
1016 | } | |
9f9354b9 | 1017 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1018 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1019 | else |
e905a9ed | 1020 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1021 | skip: |
1022 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1023 | } |
1024 | } | |
1da177e4 | 1025 | |
06770843 BL |
1026 | static inline bool inetdev_valid_mtu(unsigned mtu) |
1027 | { | |
1028 | return mtu >= 68; | |
1029 | } | |
1030 | ||
1da177e4 LT |
1031 | /* Called only under RTNL semaphore */ |
1032 | ||
1033 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1034 | void *ptr) | |
1035 | { | |
1036 | struct net_device *dev = ptr; | |
e5ed6399 | 1037 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1038 | |
1039 | ASSERT_RTNL(); | |
1040 | ||
1041 | if (!in_dev) { | |
8030f544 | 1042 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1043 | in_dev = inetdev_init(dev); |
b217d616 HX |
1044 | if (!in_dev) |
1045 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1046 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1047 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1048 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1049 | } |
06770843 BL |
1050 | } else if (event == NETDEV_CHANGEMTU) { |
1051 | /* Re-enabling IP */ | |
1052 | if (inetdev_valid_mtu(dev->mtu)) | |
1053 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1054 | } |
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | switch (event) { | |
1059 | case NETDEV_REGISTER: | |
1060 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1061 | dev->ip_ptr = NULL; | |
1062 | break; | |
1063 | case NETDEV_UP: | |
06770843 | 1064 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1065 | break; |
0cc217e1 | 1066 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1067 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1068 | ||
1069 | if (ifa) { | |
1da177e4 LT |
1070 | ifa->ifa_local = |
1071 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1072 | ifa->ifa_prefixlen = 8; | |
1073 | ifa->ifa_mask = inet_make_mask(8); | |
1074 | in_dev_hold(in_dev); | |
1075 | ifa->ifa_dev = in_dev; | |
1076 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1077 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1078 | inet_insert_ifa(ifa); | |
1079 | } | |
1080 | } | |
1081 | ip_mc_up(in_dev); | |
eefef1cf SH |
1082 | /* fall through */ |
1083 | case NETDEV_CHANGEADDR: | |
a21090cf SH |
1084 | /* Send gratuitous ARP to notify of link change */ |
1085 | if (IN_DEV_ARP_NOTIFY(in_dev)) { | |
1086 | struct in_ifaddr *ifa = in_dev->ifa_list; | |
1087 | ||
1088 | if (ifa) | |
1089 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1090 | ifa->ifa_address, dev, | |
1091 | ifa->ifa_address, NULL, | |
1092 | dev->dev_addr, NULL); | |
1093 | } | |
1da177e4 LT |
1094 | break; |
1095 | case NETDEV_DOWN: | |
1096 | ip_mc_down(in_dev); | |
1097 | break; | |
75c78500 MS |
1098 | case NETDEV_BONDING_OLDTYPE: |
1099 | ip_mc_unmap(in_dev); | |
1100 | break; | |
1101 | case NETDEV_BONDING_NEWTYPE: | |
1102 | ip_mc_remap(in_dev); | |
1103 | break; | |
1da177e4 | 1104 | case NETDEV_CHANGEMTU: |
06770843 | 1105 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1106 | break; |
06770843 | 1107 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1108 | case NETDEV_UNREGISTER: |
1109 | inetdev_destroy(in_dev); | |
1110 | break; | |
1111 | case NETDEV_CHANGENAME: | |
1112 | /* Do not notify about label change, this event is | |
1113 | * not interesting to applications using netlink. | |
1114 | */ | |
1115 | inetdev_changename(dev, in_dev); | |
1116 | ||
51602b2a | 1117 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1118 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1119 | break; |
1120 | } | |
1121 | out: | |
1122 | return NOTIFY_DONE; | |
1123 | } | |
1124 | ||
1125 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1126 | .notifier_call = inetdev_event, |
1da177e4 LT |
1127 | }; |
1128 | ||
339bf98f TG |
1129 | static inline size_t inet_nlmsg_size(void) |
1130 | { | |
1131 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1132 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1133 | + nla_total_size(4) /* IFA_LOCAL */ | |
1134 | + nla_total_size(4) /* IFA_BROADCAST */ | |
339bf98f TG |
1135 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ |
1136 | } | |
1137 | ||
1da177e4 | 1138 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1139 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1140 | { |
1141 | struct ifaddrmsg *ifm; | |
1142 | struct nlmsghdr *nlh; | |
1da177e4 | 1143 | |
47f68512 TG |
1144 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1145 | if (nlh == NULL) | |
26932566 | 1146 | return -EMSGSIZE; |
47f68512 TG |
1147 | |
1148 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1149 | ifm->ifa_family = AF_INET; |
1150 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1151 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1152 | ifm->ifa_scope = ifa->ifa_scope; | |
1153 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1154 | |
1da177e4 | 1155 | if (ifa->ifa_address) |
a7a628c4 | 1156 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1157 | |
1da177e4 | 1158 | if (ifa->ifa_local) |
a7a628c4 | 1159 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1160 | |
1da177e4 | 1161 | if (ifa->ifa_broadcast) |
a7a628c4 | 1162 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1163 | |
1da177e4 | 1164 | if (ifa->ifa_label[0]) |
47f68512 | 1165 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1166 | |
47f68512 TG |
1167 | return nlmsg_end(skb, nlh); |
1168 | ||
1169 | nla_put_failure: | |
26932566 PM |
1170 | nlmsg_cancel(skb, nlh); |
1171 | return -EMSGSIZE; | |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1175 | { | |
3b1e0a65 | 1176 | struct net *net = sock_net(skb->sk); |
eec4df98 ED |
1177 | int h, s_h; |
1178 | int idx, s_idx; | |
1179 | int ip_idx, s_ip_idx; | |
1da177e4 LT |
1180 | struct net_device *dev; |
1181 | struct in_device *in_dev; | |
1182 | struct in_ifaddr *ifa; | |
eec4df98 ED |
1183 | struct hlist_head *head; |
1184 | struct hlist_node *node; | |
1da177e4 | 1185 | |
eec4df98 ED |
1186 | s_h = cb->args[0]; |
1187 | s_idx = idx = cb->args[1]; | |
1188 | s_ip_idx = ip_idx = cb->args[2]; | |
1189 | ||
1190 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1191 | idx = 0; | |
1192 | head = &net->dev_index_head[h]; | |
1193 | rcu_read_lock(); | |
1194 | hlist_for_each_entry_rcu(dev, node, head, index_hlist) { | |
1195 | if (idx < s_idx) | |
1196 | goto cont; | |
1197 | if (idx > s_idx) | |
1198 | s_ip_idx = 0; | |
1199 | in_dev = __in_dev_get_rcu(dev); | |
1200 | if (!in_dev) | |
1201 | goto cont; | |
1da177e4 | 1202 | |
eec4df98 ED |
1203 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; |
1204 | ifa = ifa->ifa_next, ip_idx++) { | |
1205 | if (ip_idx < s_ip_idx) | |
1206 | continue; | |
1207 | if (inet_fill_ifaddr(skb, ifa, | |
1208 | NETLINK_CB(cb->skb).pid, | |
1da177e4 | 1209 | cb->nlh->nlmsg_seq, |
eec4df98 ED |
1210 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1211 | rcu_read_unlock(); | |
1212 | goto done; | |
1213 | } | |
1214 | } | |
7562f876 | 1215 | cont: |
eec4df98 ED |
1216 | idx++; |
1217 | } | |
1218 | rcu_read_unlock(); | |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | done: | |
eec4df98 ED |
1222 | cb->args[0] = h; |
1223 | cb->args[1] = idx; | |
1224 | cb->args[2] = ip_idx; | |
1da177e4 LT |
1225 | |
1226 | return skb->len; | |
1227 | } | |
1228 | ||
539afedf | 1229 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
d6062cbb | 1230 | u32 pid) |
1da177e4 | 1231 | { |
47f68512 | 1232 | struct sk_buff *skb; |
d6062cbb TG |
1233 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1234 | int err = -ENOBUFS; | |
4b8aa9ab | 1235 | struct net *net; |
1da177e4 | 1236 | |
c346dca1 | 1237 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1238 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1239 | if (skb == NULL) |
d6062cbb TG |
1240 | goto errout; |
1241 | ||
1242 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1243 | if (err < 0) { |
1244 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1245 | WARN_ON(err == -EMSGSIZE); | |
1246 | kfree_skb(skb); | |
1247 | goto errout; | |
1248 | } | |
1ce85fe4 PNA |
1249 | rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1250 | return; | |
d6062cbb TG |
1251 | errout: |
1252 | if (err < 0) | |
4b8aa9ab | 1253 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1254 | } |
1255 | ||
1da177e4 LT |
1256 | #ifdef CONFIG_SYSCTL |
1257 | ||
c0ce9fb3 | 1258 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1259 | { |
1260 | struct net_device *dev; | |
1261 | ||
c6d14c84 ED |
1262 | rcu_read_lock(); |
1263 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 1264 | struct in_device *in_dev; |
c6d14c84 | 1265 | |
31be3085 HX |
1266 | in_dev = __in_dev_get_rcu(dev); |
1267 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1268 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 1269 | } |
c6d14c84 | 1270 | rcu_read_unlock(); |
31be3085 HX |
1271 | } |
1272 | ||
c6d14c84 | 1273 | /* called with RTNL locked */ |
c0ce9fb3 | 1274 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1275 | { |
1276 | struct net_device *dev; | |
586f1211 | 1277 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1278 | |
586f1211 | 1279 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1280 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
68dd299b | 1281 | |
c0ce9fb3 | 1282 | for_each_netdev(net, dev) { |
68dd299b | 1283 | struct in_device *in_dev; |
0187bdfb BH |
1284 | if (on) |
1285 | dev_disable_lro(dev); | |
68dd299b PE |
1286 | rcu_read_lock(); |
1287 | in_dev = __in_dev_get_rcu(dev); | |
1288 | if (in_dev) | |
1289 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1290 | rcu_read_unlock(); | |
1291 | } | |
68dd299b PE |
1292 | } |
1293 | ||
31be3085 | 1294 | static int devinet_conf_proc(ctl_table *ctl, int write, |
8d65af78 | 1295 | void __user *buffer, |
31be3085 HX |
1296 | size_t *lenp, loff_t *ppos) |
1297 | { | |
8d65af78 | 1298 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
31be3085 HX |
1299 | |
1300 | if (write) { | |
1301 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1302 | struct net *net = ctl->extra2; |
31be3085 HX |
1303 | int i = (int *)ctl->data - cnf->data; |
1304 | ||
1305 | set_bit(i, cnf->state); | |
1306 | ||
9355bbd6 | 1307 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1308 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1309 | } |
1310 | ||
1311 | return ret; | |
1312 | } | |
1313 | ||
1da177e4 | 1314 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
8d65af78 | 1315 | void __user *buffer, |
1da177e4 LT |
1316 | size_t *lenp, loff_t *ppos) |
1317 | { | |
1318 | int *valp = ctl->data; | |
1319 | int val = *valp; | |
8d65af78 | 1320 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
1321 | |
1322 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1323 | struct net *net = ctl->extra2; |
1324 | ||
0187bdfb | 1325 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
9b8adb5e EB |
1326 | if (!rtnl_trylock()) |
1327 | return restart_syscall(); | |
0187bdfb BH |
1328 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
1329 | inet_forward_change(net); | |
1330 | } else if (*valp) { | |
1331 | struct ipv4_devconf *cnf = ctl->extra1; | |
1332 | struct in_device *idev = | |
1333 | container_of(cnf, struct in_device, cnf); | |
1334 | dev_disable_lro(idev->dev); | |
1335 | } | |
1336 | rtnl_unlock(); | |
76e6ebfb | 1337 | rt_cache_flush(net, 0); |
0187bdfb | 1338 | } |
1da177e4 LT |
1339 | } |
1340 | ||
1341 | return ret; | |
1342 | } | |
1343 | ||
1344 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
8d65af78 | 1345 | void __user *buffer, |
1da177e4 LT |
1346 | size_t *lenp, loff_t *ppos) |
1347 | { | |
1348 | int *valp = ctl->data; | |
1349 | int val = *valp; | |
8d65af78 | 1350 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 1351 | struct net *net = ctl->extra2; |
1da177e4 LT |
1352 | |
1353 | if (write && *valp != val) | |
76e6ebfb | 1354 | rt_cache_flush(net, 0); |
1da177e4 LT |
1355 | |
1356 | return ret; | |
1357 | } | |
1358 | ||
f8572d8f | 1359 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 1360 | { \ |
42f811b8 HX |
1361 | .procname = name, \ |
1362 | .data = ipv4_devconf.data + \ | |
1363 | NET_IPV4_CONF_ ## attr - 1, \ | |
1364 | .maxlen = sizeof(int), \ | |
1365 | .mode = mval, \ | |
1366 | .proc_handler = proc, \ | |
31be3085 | 1367 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1368 | } |
1369 | ||
1370 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 1371 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
1372 | |
1373 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 1374 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 1375 | |
f8572d8f EB |
1376 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
1377 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
1378 | |
1379 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 1380 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 1381 | |
1da177e4 LT |
1382 | static struct devinet_sysctl_table { |
1383 | struct ctl_table_header *sysctl_header; | |
bfada697 PE |
1384 | struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; |
1385 | char *dev_name; | |
1da177e4 LT |
1386 | } devinet_sysctl = { |
1387 | .devinet_vars = { | |
42f811b8 | 1388 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 1389 | devinet_sysctl_forward), |
42f811b8 HX |
1390 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1391 | ||
1392 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1393 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1394 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1395 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1396 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1397 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1398 | "accept_source_route"), | |
8153a10c | 1399 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
42f811b8 HX |
1400 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
1401 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1402 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1403 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1404 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1405 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1406 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1407 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1408 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 1409 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
65324144 | 1410 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
42f811b8 HX |
1411 | |
1412 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1413 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1414 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1415 | "force_igmp_version"), | |
1416 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1417 | "promote_secondaries"), | |
1da177e4 | 1418 | }, |
1da177e4 LT |
1419 | }; |
1420 | ||
ea40b324 | 1421 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
f8572d8f | 1422 | struct ipv4_devconf *p) |
1da177e4 LT |
1423 | { |
1424 | int i; | |
9fa89642 | 1425 | struct devinet_sysctl_table *t; |
1da177e4 | 1426 | |
bfada697 PE |
1427 | #define DEVINET_CTL_PATH_DEV 3 |
1428 | ||
1429 | struct ctl_path devinet_ctl_path[] = { | |
f8572d8f EB |
1430 | { .procname = "net", }, |
1431 | { .procname = "ipv4", }, | |
1432 | { .procname = "conf", }, | |
bfada697 PE |
1433 | { /* to be set */ }, |
1434 | { }, | |
1435 | }; | |
1436 | ||
9fa89642 | 1437 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1438 | if (!t) |
9fa89642 PE |
1439 | goto out; |
1440 | ||
1da177e4 LT |
1441 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1442 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1443 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1444 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1445 | } |
1446 | ||
e905a9ed YH |
1447 | /* |
1448 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1449 | * by sysctl and we wouldn't want anyone to change it under our feet |
1450 | * (see SIOCSIFNAME). | |
e905a9ed | 1451 | */ |
bfada697 PE |
1452 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1453 | if (!t->dev_name) | |
9fa89642 | 1454 | goto free; |
1da177e4 | 1455 | |
bfada697 | 1456 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1da177e4 | 1457 | |
752d14dc | 1458 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, |
bfada697 | 1459 | t->devinet_vars); |
1da177e4 | 1460 | if (!t->sysctl_header) |
9fa89642 | 1461 | goto free_procname; |
1da177e4 LT |
1462 | |
1463 | p->sysctl = t; | |
ea40b324 | 1464 | return 0; |
1da177e4 | 1465 | |
9fa89642 | 1466 | free_procname: |
bfada697 | 1467 | kfree(t->dev_name); |
9fa89642 | 1468 | free: |
1da177e4 | 1469 | kfree(t); |
9fa89642 | 1470 | out: |
ea40b324 | 1471 | return -ENOBUFS; |
1da177e4 LT |
1472 | } |
1473 | ||
51602b2a PE |
1474 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1475 | { | |
1476 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1477 | ||
1478 | if (t == NULL) | |
1479 | return; | |
1480 | ||
1481 | cnf->sysctl = NULL; | |
1482 | unregister_sysctl_table(t->sysctl_header); | |
1483 | kfree(t->dev_name); | |
1484 | kfree(t); | |
1485 | } | |
1486 | ||
66f27a52 PE |
1487 | static void devinet_sysctl_register(struct in_device *idev) |
1488 | { | |
51602b2a | 1489 | neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4, |
f8572d8f | 1490 | NET_IPV4_NEIGH, "ipv4", NULL); |
c346dca1 | 1491 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, |
f8572d8f | 1492 | &idev->cnf); |
66f27a52 PE |
1493 | } |
1494 | ||
51602b2a | 1495 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1496 | { |
51602b2a PE |
1497 | __devinet_sysctl_unregister(&idev->cnf); |
1498 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 1499 | } |
1da177e4 | 1500 | |
68dd299b PE |
1501 | static struct ctl_table ctl_forward_entry[] = { |
1502 | { | |
68dd299b PE |
1503 | .procname = "ip_forward", |
1504 | .data = &ipv4_devconf.data[ | |
1505 | NET_IPV4_CONF_FORWARDING - 1], | |
1506 | .maxlen = sizeof(int), | |
1507 | .mode = 0644, | |
1508 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 1509 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 1510 | .extra2 = &init_net, |
68dd299b PE |
1511 | }, |
1512 | { }, | |
1513 | }; | |
1514 | ||
752d14dc | 1515 | static __net_initdata struct ctl_path net_ipv4_path[] = { |
f8572d8f EB |
1516 | { .procname = "net", }, |
1517 | { .procname = "ipv4", }, | |
68dd299b PE |
1518 | { }, |
1519 | }; | |
2a75de0c | 1520 | #endif |
68dd299b | 1521 | |
752d14dc PE |
1522 | static __net_init int devinet_init_net(struct net *net) |
1523 | { | |
1524 | int err; | |
752d14dc | 1525 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
1526 | #ifdef CONFIG_SYSCTL |
1527 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 1528 | struct ctl_table_header *forw_hdr; |
2a75de0c | 1529 | #endif |
752d14dc PE |
1530 | |
1531 | err = -ENOMEM; | |
1532 | all = &ipv4_devconf; | |
1533 | dflt = &ipv4_devconf_dflt; | |
752d14dc | 1534 | |
09ad9bc7 | 1535 | if (!net_eq(net, &init_net)) { |
752d14dc PE |
1536 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); |
1537 | if (all == NULL) | |
1538 | goto err_alloc_all; | |
1539 | ||
1540 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1541 | if (dflt == NULL) | |
1542 | goto err_alloc_dflt; | |
1543 | ||
2a75de0c | 1544 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1545 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
1546 | if (tbl == NULL) | |
1547 | goto err_alloc_ctl; | |
1548 | ||
1549 | tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1]; | |
1550 | tbl[0].extra1 = all; | |
1551 | tbl[0].extra2 = net; | |
2a75de0c | 1552 | #endif |
752d14dc PE |
1553 | } |
1554 | ||
1555 | #ifdef CONFIG_SYSCTL | |
f8572d8f | 1556 | err = __devinet_sysctl_register(net, "all", all); |
752d14dc PE |
1557 | if (err < 0) |
1558 | goto err_reg_all; | |
1559 | ||
f8572d8f | 1560 | err = __devinet_sysctl_register(net, "default", dflt); |
752d14dc PE |
1561 | if (err < 0) |
1562 | goto err_reg_dflt; | |
1563 | ||
1564 | err = -ENOMEM; | |
1565 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1566 | if (forw_hdr == NULL) | |
1567 | goto err_reg_ctl; | |
2a75de0c | 1568 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
1569 | #endif |
1570 | ||
752d14dc PE |
1571 | net->ipv4.devconf_all = all; |
1572 | net->ipv4.devconf_dflt = dflt; | |
1573 | return 0; | |
1574 | ||
1575 | #ifdef CONFIG_SYSCTL | |
1576 | err_reg_ctl: | |
1577 | __devinet_sysctl_unregister(dflt); | |
1578 | err_reg_dflt: | |
1579 | __devinet_sysctl_unregister(all); | |
1580 | err_reg_all: | |
1581 | if (tbl != ctl_forward_entry) | |
1582 | kfree(tbl); | |
752d14dc | 1583 | err_alloc_ctl: |
2a75de0c | 1584 | #endif |
752d14dc PE |
1585 | if (dflt != &ipv4_devconf_dflt) |
1586 | kfree(dflt); | |
1587 | err_alloc_dflt: | |
1588 | if (all != &ipv4_devconf) | |
1589 | kfree(all); | |
1590 | err_alloc_all: | |
1591 | return err; | |
1592 | } | |
1593 | ||
1594 | static __net_exit void devinet_exit_net(struct net *net) | |
1595 | { | |
2a75de0c | 1596 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1597 | struct ctl_table *tbl; |
1598 | ||
1599 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
1600 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
1601 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1602 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 1603 | kfree(tbl); |
2a75de0c | 1604 | #endif |
752d14dc PE |
1605 | kfree(net->ipv4.devconf_dflt); |
1606 | kfree(net->ipv4.devconf_all); | |
1607 | } | |
1608 | ||
1609 | static __net_initdata struct pernet_operations devinet_ops = { | |
1610 | .init = devinet_init_net, | |
1611 | .exit = devinet_exit_net, | |
1612 | }; | |
1613 | ||
1da177e4 LT |
1614 | void __init devinet_init(void) |
1615 | { | |
752d14dc PE |
1616 | register_pernet_subsys(&devinet_ops); |
1617 | ||
1da177e4 LT |
1618 | register_gifconf(PF_INET, inet_gifconf); |
1619 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f TG |
1620 | |
1621 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1622 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1623 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 LT |
1624 | } |
1625 |