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1 | /* | |
2 | * NET3 IP device support routines. | |
3 | * | |
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 | |
10 | * Authors: Ross Biro | |
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 | ||
28 | ||
29 | #include <asm/uaccess.h> | |
30 | #include <asm/system.h> | |
31 | #include <linux/bitops.h> | |
32 | #include <linux/capability.h> | |
33 | #include <linux/module.h> | |
34 | #include <linux/types.h> | |
35 | #include <linux/kernel.h> | |
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> | |
43 | #include <linux/if_addr.h> | |
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> | |
49 | #include <linux/init.h> | |
50 | #include <linux/notifier.h> | |
51 | #include <linux/inetdevice.h> | |
52 | #include <linux/igmp.h> | |
53 | #include <linux/slab.h> | |
54 | #ifdef CONFIG_SYSCTL | |
55 | #include <linux/sysctl.h> | |
56 | #endif | |
57 | #include <linux/kmod.h> | |
58 | ||
59 | #include <net/arp.h> | |
60 | #include <net/ip.h> | |
61 | #include <net/route.h> | |
62 | #include <net/ip_fib.h> | |
63 | #include <net/rtnetlink.h> | |
64 | #include <net/net_namespace.h> | |
65 | ||
66 | static struct ipv4_devconf ipv4_devconf = { | |
67 | .data = { | |
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, | |
72 | }, | |
73 | }; | |
74 | ||
75 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
76 | .data = { | |
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, | |
82 | }, | |
83 | }; | |
84 | ||
85 | #define IPV4_DEVCONF_DFLT(net, attr) \ | |
86 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
87 | ||
88 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { | |
89 | [IFA_LOCAL] = { .type = NLA_U32 }, | |
90 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
91 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
92 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, | |
93 | }; | |
94 | ||
95 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); | |
96 | ||
97 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); | |
98 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, | |
99 | int destroy); | |
100 | #ifdef CONFIG_SYSCTL | |
101 | static void devinet_sysctl_register(struct in_device *idev); | |
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 | } | |
110 | #endif | |
111 | ||
112 | /* Locks all the inet devices. */ | |
113 | ||
114 | static struct in_ifaddr *inet_alloc_ifa(void) | |
115 | { | |
116 | return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); | |
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 | ||
136 | WARN_ON(idev->ifa_list); | |
137 | WARN_ON(idev->mc_list); | |
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) | |
144 | pr_err("Freeing alive in_device %p\n", idev); | |
145 | else | |
146 | kfree(idev); | |
147 | } | |
148 | EXPORT_SYMBOL(in_dev_finish_destroy); | |
149 | ||
150 | static struct in_device *inetdev_init(struct net_device *dev) | |
151 | { | |
152 | struct in_device *in_dev; | |
153 | ||
154 | ASSERT_RTNL(); | |
155 | ||
156 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); | |
157 | if (!in_dev) | |
158 | goto out; | |
159 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, | |
160 | sizeof(in_dev->cnf)); | |
161 | in_dev->cnf.sysctl = NULL; | |
162 | in_dev->dev = dev; | |
163 | in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); | |
164 | if (!in_dev->arp_parms) | |
165 | goto out_kfree; | |
166 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) | |
167 | dev_disable_lro(dev); | |
168 | /* Reference in_dev->dev */ | |
169 | dev_hold(dev); | |
170 | /* Account for reference dev->ip_ptr (below) */ | |
171 | in_dev_hold(in_dev); | |
172 | ||
173 | devinet_sysctl_register(in_dev); | |
174 | ip_mc_init_dev(in_dev); | |
175 | if (dev->flags & IFF_UP) | |
176 | ip_mc_up(in_dev); | |
177 | ||
178 | /* we can receive as soon as ip_ptr is set -- do this last */ | |
179 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
180 | out: | |
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; | |
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 | ||
212 | rcu_assign_pointer(dev->ip_ptr, NULL); | |
213 | ||
214 | devinet_sysctl_unregister(in_dev); | |
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 | ||
221 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) | |
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 | ||
236 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, | |
237 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
238 | { | |
239 | struct in_ifaddr *promote = NULL; | |
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); | |
244 | ||
245 | ASSERT_RTNL(); | |
246 | ||
247 | /* 1. Deleting primary ifaddr forces deletion all secondaries | |
248 | * unless alias promotion is set | |
249 | **/ | |
250 | ||
251 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
252 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; | |
253 | ||
254 | while ((ifa = *ifap1) != NULL) { | |
255 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && | |
256 | ifa1->ifa_scope <= ifa->ifa_scope) | |
257 | last_prim = ifa; | |
258 | ||
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; | |
263 | prev_prom = ifa; | |
264 | continue; | |
265 | } | |
266 | ||
267 | if (!do_promote) { | |
268 | *ifap1 = ifa->ifa_next; | |
269 | ||
270 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); | |
271 | blocking_notifier_call_chain(&inetaddr_chain, | |
272 | NETDEV_DOWN, ifa); | |
273 | inet_free_ifa(ifa); | |
274 | } else { | |
275 | promote = ifa; | |
276 | break; | |
277 | } | |
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 | */ | |
295 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); | |
296 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); | |
297 | ||
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 | } | |
305 | ||
306 | promote->ifa_flags &= ~IFA_F_SECONDARY; | |
307 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); | |
308 | blocking_notifier_call_chain(&inetaddr_chain, | |
309 | NETDEV_UP, promote); | |
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 | } | |
318 | if (destroy) | |
319 | inet_free_ifa(ifa1); | |
320 | } | |
321 | ||
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) | |
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 */ | |
374 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); | |
375 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static int inet_insert_ifa(struct in_ifaddr *ifa) | |
381 | { | |
382 | return __inet_insert_ifa(ifa, NULL, 0); | |
383 | } | |
384 | ||
385 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) | |
386 | { | |
387 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
388 | ||
389 | ASSERT_RTNL(); | |
390 | ||
391 | if (!in_dev) { | |
392 | inet_free_ifa(ifa); | |
393 | return -ENOBUFS; | |
394 | } | |
395 | ipv4_devconf_setall(in_dev); | |
396 | if (ifa->ifa_dev != in_dev) { | |
397 | WARN_ON(ifa->ifa_dev); | |
398 | in_dev_hold(in_dev); | |
399 | ifa->ifa_dev = in_dev; | |
400 | } | |
401 | if (ipv4_is_loopback(ifa->ifa_local)) | |
402 | ifa->ifa_scope = RT_SCOPE_HOST; | |
403 | return inet_insert_ifa(ifa); | |
404 | } | |
405 | ||
406 | /* Caller must hold RCU or RTNL : | |
407 | * We dont take a reference on found in_device | |
408 | */ | |
409 | struct in_device *inetdev_by_index(struct net *net, int ifindex) | |
410 | { | |
411 | struct net_device *dev; | |
412 | struct in_device *in_dev = NULL; | |
413 | ||
414 | rcu_read_lock(); | |
415 | dev = dev_get_by_index_rcu(net, ifindex); | |
416 | if (dev) | |
417 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); | |
418 | rcu_read_unlock(); | |
419 | return in_dev; | |
420 | } | |
421 | EXPORT_SYMBOL(inetdev_by_index); | |
422 | ||
423 | /* Called only from RTNL semaphored context. No locks. */ | |
424 | ||
425 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, | |
426 | __be32 mask) | |
427 | { | |
428 | ASSERT_RTNL(); | |
429 | ||
430 | for_primary_ifa(in_dev) { | |
431 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
432 | return ifa; | |
433 | } endfor_ifa(in_dev); | |
434 | return NULL; | |
435 | } | |
436 | ||
437 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
438 | { | |
439 | struct net *net = sock_net(skb->sk); | |
440 | struct nlattr *tb[IFA_MAX+1]; | |
441 | struct in_device *in_dev; | |
442 | struct ifaddrmsg *ifm; | |
443 | struct in_ifaddr *ifa, **ifap; | |
444 | int err = -EINVAL; | |
445 | ||
446 | ASSERT_RTNL(); | |
447 | ||
448 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); | |
449 | if (err < 0) | |
450 | goto errout; | |
451 | ||
452 | ifm = nlmsg_data(nlh); | |
453 | in_dev = inetdev_by_index(net, ifm->ifa_index); | |
454 | if (in_dev == NULL) { | |
455 | err = -ENODEV; | |
456 | goto errout; | |
457 | } | |
458 | ||
459 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
460 | ifap = &ifa->ifa_next) { | |
461 | if (tb[IFA_LOCAL] && | |
462 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) | |
463 | continue; | |
464 | ||
465 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
466 | continue; | |
467 | ||
468 | if (tb[IFA_ADDRESS] && | |
469 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
470 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) | |
471 | continue; | |
472 | ||
473 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); | |
474 | return 0; | |
475 | } | |
476 | ||
477 | err = -EADDRNOTAVAIL; | |
478 | errout: | |
479 | return err; | |
480 | } | |
481 | ||
482 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) | |
483 | { | |
484 | struct nlattr *tb[IFA_MAX+1]; | |
485 | struct in_ifaddr *ifa; | |
486 | struct ifaddrmsg *ifm; | |
487 | struct net_device *dev; | |
488 | struct in_device *in_dev; | |
489 | int err; | |
490 | ||
491 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); | |
492 | if (err < 0) | |
493 | goto errout; | |
494 | ||
495 | ifm = nlmsg_data(nlh); | |
496 | err = -EINVAL; | |
497 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
498 | goto errout; | |
499 | ||
500 | dev = __dev_get_by_index(net, ifm->ifa_index); | |
501 | err = -ENODEV; | |
502 | if (dev == NULL) | |
503 | goto errout; | |
504 | ||
505 | in_dev = __in_dev_get_rtnl(dev); | |
506 | err = -ENOBUFS; | |
507 | if (in_dev == NULL) | |
508 | goto errout; | |
509 | ||
510 | ifa = inet_alloc_ifa(); | |
511 | if (ifa == NULL) | |
512 | /* | |
513 | * A potential indev allocation can be left alive, it stays | |
514 | * assigned to its device and is destroy with it. | |
515 | */ | |
516 | goto errout; | |
517 | ||
518 | ipv4_devconf_setall(in_dev); | |
519 | in_dev_hold(in_dev); | |
520 | ||
521 | if (tb[IFA_ADDRESS] == NULL) | |
522 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
523 | ||
524 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; | |
525 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
526 | ifa->ifa_flags = ifm->ifa_flags; | |
527 | ifa->ifa_scope = ifm->ifa_scope; | |
528 | ifa->ifa_dev = in_dev; | |
529 | ||
530 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); | |
531 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
532 | ||
533 | if (tb[IFA_BROADCAST]) | |
534 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); | |
535 | ||
536 | if (tb[IFA_LABEL]) | |
537 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
538 | else | |
539 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
540 | ||
541 | return ifa; | |
542 | ||
543 | errout: | |
544 | return ERR_PTR(err); | |
545 | } | |
546 | ||
547 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
548 | { | |
549 | struct net *net = sock_net(skb->sk); | |
550 | struct in_ifaddr *ifa; | |
551 | ||
552 | ASSERT_RTNL(); | |
553 | ||
554 | ifa = rtm_to_ifaddr(net, nlh); | |
555 | if (IS_ERR(ifa)) | |
556 | return PTR_ERR(ifa); | |
557 | ||
558 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); | |
559 | } | |
560 | ||
561 | /* | |
562 | * Determine a default network mask, based on the IP address. | |
563 | */ | |
564 | ||
565 | static inline int inet_abc_len(__be32 addr) | |
566 | { | |
567 | int rc = -1; /* Something else, probably a multicast. */ | |
568 | ||
569 | if (ipv4_is_zeronet(addr)) | |
570 | rc = 0; | |
571 | else { | |
572 | __u32 haddr = ntohl(addr); | |
573 | ||
574 | if (IN_CLASSA(haddr)) | |
575 | rc = 8; | |
576 | else if (IN_CLASSB(haddr)) | |
577 | rc = 16; | |
578 | else if (IN_CLASSC(haddr)) | |
579 | rc = 24; | |
580 | } | |
581 | ||
582 | return rc; | |
583 | } | |
584 | ||
585 | ||
586 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) | |
587 | { | |
588 | struct ifreq ifr; | |
589 | struct sockaddr_in sin_orig; | |
590 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
591 | struct in_device *in_dev; | |
592 | struct in_ifaddr **ifap = NULL; | |
593 | struct in_ifaddr *ifa = NULL; | |
594 | struct net_device *dev; | |
595 | char *colon; | |
596 | int ret = -EFAULT; | |
597 | int tryaddrmatch = 0; | |
598 | ||
599 | /* | |
600 | * Fetch the caller's info block into kernel space | |
601 | */ | |
602 | ||
603 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
604 | goto out; | |
605 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
606 | ||
607 | /* save original address for comparison */ | |
608 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
609 | ||
610 | colon = strchr(ifr.ifr_name, ':'); | |
611 | if (colon) | |
612 | *colon = 0; | |
613 | ||
614 | dev_load(net, ifr.ifr_name); | |
615 | ||
616 | switch (cmd) { | |
617 | case SIOCGIFADDR: /* Get interface address */ | |
618 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
619 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
620 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
621 | /* Note that these ioctls will not sleep, | |
622 | so that we do not impose a lock. | |
623 | One day we will be forced to put shlock here (I mean SMP) | |
624 | */ | |
625 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
626 | memset(sin, 0, sizeof(*sin)); | |
627 | sin->sin_family = AF_INET; | |
628 | break; | |
629 | ||
630 | case SIOCSIFFLAGS: | |
631 | ret = -EACCES; | |
632 | if (!capable(CAP_NET_ADMIN)) | |
633 | goto out; | |
634 | break; | |
635 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
636 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
637 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
638 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
639 | ret = -EACCES; | |
640 | if (!capable(CAP_NET_ADMIN)) | |
641 | goto out; | |
642 | ret = -EINVAL; | |
643 | if (sin->sin_family != AF_INET) | |
644 | goto out; | |
645 | break; | |
646 | default: | |
647 | ret = -EINVAL; | |
648 | goto out; | |
649 | } | |
650 | ||
651 | rtnl_lock(); | |
652 | ||
653 | ret = -ENODEV; | |
654 | dev = __dev_get_by_name(net, ifr.ifr_name); | |
655 | if (!dev) | |
656 | goto done; | |
657 | ||
658 | if (colon) | |
659 | *colon = ':'; | |
660 | ||
661 | in_dev = __in_dev_get_rtnl(dev); | |
662 | if (in_dev) { | |
663 | if (tryaddrmatch) { | |
664 | /* Matthias Andree */ | |
665 | /* compare label and address (4.4BSD style) */ | |
666 | /* note: we only do this for a limited set of ioctls | |
667 | and only if the original address family was AF_INET. | |
668 | This is checked above. */ | |
669 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
670 | ifap = &ifa->ifa_next) { | |
671 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
672 | sin_orig.sin_addr.s_addr == | |
673 | ifa->ifa_address) { | |
674 | break; /* found */ | |
675 | } | |
676 | } | |
677 | } | |
678 | /* we didn't get a match, maybe the application is | |
679 | 4.3BSD-style and passed in junk so we fall back to | |
680 | comparing just the label */ | |
681 | if (!ifa) { | |
682 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
683 | ifap = &ifa->ifa_next) | |
684 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
685 | break; | |
686 | } | |
687 | } | |
688 | ||
689 | ret = -EADDRNOTAVAIL; | |
690 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
691 | goto done; | |
692 | ||
693 | switch (cmd) { | |
694 | case SIOCGIFADDR: /* Get interface address */ | |
695 | sin->sin_addr.s_addr = ifa->ifa_local; | |
696 | goto rarok; | |
697 | ||
698 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
699 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
700 | goto rarok; | |
701 | ||
702 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
703 | sin->sin_addr.s_addr = ifa->ifa_address; | |
704 | goto rarok; | |
705 | ||
706 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
707 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
708 | goto rarok; | |
709 | ||
710 | case SIOCSIFFLAGS: | |
711 | if (colon) { | |
712 | ret = -EADDRNOTAVAIL; | |
713 | if (!ifa) | |
714 | break; | |
715 | ret = 0; | |
716 | if (!(ifr.ifr_flags & IFF_UP)) | |
717 | inet_del_ifa(in_dev, ifap, 1); | |
718 | break; | |
719 | } | |
720 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
721 | break; | |
722 | ||
723 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
724 | ret = -EINVAL; | |
725 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
726 | break; | |
727 | ||
728 | if (!ifa) { | |
729 | ret = -ENOBUFS; | |
730 | ifa = inet_alloc_ifa(); | |
731 | if (!ifa) | |
732 | break; | |
733 | if (colon) | |
734 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
735 | else | |
736 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
737 | } else { | |
738 | ret = 0; | |
739 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
740 | break; | |
741 | inet_del_ifa(in_dev, ifap, 0); | |
742 | ifa->ifa_broadcast = 0; | |
743 | ifa->ifa_scope = 0; | |
744 | } | |
745 | ||
746 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
747 | ||
748 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
749 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
750 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
751 | if ((dev->flags & IFF_BROADCAST) && | |
752 | ifa->ifa_prefixlen < 31) | |
753 | ifa->ifa_broadcast = ifa->ifa_address | | |
754 | ~ifa->ifa_mask; | |
755 | } else { | |
756 | ifa->ifa_prefixlen = 32; | |
757 | ifa->ifa_mask = inet_make_mask(32); | |
758 | } | |
759 | ret = inet_set_ifa(dev, ifa); | |
760 | break; | |
761 | ||
762 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
763 | ret = 0; | |
764 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
765 | inet_del_ifa(in_dev, ifap, 0); | |
766 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
767 | inet_insert_ifa(ifa); | |
768 | } | |
769 | break; | |
770 | ||
771 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
772 | ret = 0; | |
773 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
774 | break; | |
775 | ret = -EINVAL; | |
776 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
777 | break; | |
778 | ret = 0; | |
779 | inet_del_ifa(in_dev, ifap, 0); | |
780 | ifa->ifa_address = sin->sin_addr.s_addr; | |
781 | inet_insert_ifa(ifa); | |
782 | break; | |
783 | ||
784 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
785 | ||
786 | /* | |
787 | * The mask we set must be legal. | |
788 | */ | |
789 | ret = -EINVAL; | |
790 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
791 | break; | |
792 | ret = 0; | |
793 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
794 | __be32 old_mask = ifa->ifa_mask; | |
795 | inet_del_ifa(in_dev, ifap, 0); | |
796 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
797 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
798 | ||
799 | /* See if current broadcast address matches | |
800 | * with current netmask, then recalculate | |
801 | * the broadcast address. Otherwise it's a | |
802 | * funny address, so don't touch it since | |
803 | * the user seems to know what (s)he's doing... | |
804 | */ | |
805 | if ((dev->flags & IFF_BROADCAST) && | |
806 | (ifa->ifa_prefixlen < 31) && | |
807 | (ifa->ifa_broadcast == | |
808 | (ifa->ifa_local|~old_mask))) { | |
809 | ifa->ifa_broadcast = (ifa->ifa_local | | |
810 | ~sin->sin_addr.s_addr); | |
811 | } | |
812 | inet_insert_ifa(ifa); | |
813 | } | |
814 | break; | |
815 | } | |
816 | done: | |
817 | rtnl_unlock(); | |
818 | out: | |
819 | return ret; | |
820 | rarok: | |
821 | rtnl_unlock(); | |
822 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
823 | goto out; | |
824 | } | |
825 | ||
826 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
827 | { | |
828 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
829 | struct in_ifaddr *ifa; | |
830 | struct ifreq ifr; | |
831 | int done = 0; | |
832 | ||
833 | if (!in_dev) | |
834 | goto out; | |
835 | ||
836 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
837 | if (!buf) { | |
838 | done += sizeof(ifr); | |
839 | continue; | |
840 | } | |
841 | if (len < (int) sizeof(ifr)) | |
842 | break; | |
843 | memset(&ifr, 0, sizeof(struct ifreq)); | |
844 | if (ifa->ifa_label) | |
845 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
846 | else | |
847 | strcpy(ifr.ifr_name, dev->name); | |
848 | ||
849 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
850 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
851 | ifa->ifa_local; | |
852 | ||
853 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
854 | done = -EFAULT; | |
855 | break; | |
856 | } | |
857 | buf += sizeof(struct ifreq); | |
858 | len -= sizeof(struct ifreq); | |
859 | done += sizeof(struct ifreq); | |
860 | } | |
861 | out: | |
862 | return done; | |
863 | } | |
864 | ||
865 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) | |
866 | { | |
867 | __be32 addr = 0; | |
868 | struct in_device *in_dev; | |
869 | struct net *net = dev_net(dev); | |
870 | ||
871 | rcu_read_lock(); | |
872 | in_dev = __in_dev_get_rcu(dev); | |
873 | if (!in_dev) | |
874 | goto no_in_dev; | |
875 | ||
876 | for_primary_ifa(in_dev) { | |
877 | if (ifa->ifa_scope > scope) | |
878 | continue; | |
879 | if (!dst || inet_ifa_match(dst, ifa)) { | |
880 | addr = ifa->ifa_local; | |
881 | break; | |
882 | } | |
883 | if (!addr) | |
884 | addr = ifa->ifa_local; | |
885 | } endfor_ifa(in_dev); | |
886 | ||
887 | if (addr) | |
888 | goto out_unlock; | |
889 | no_in_dev: | |
890 | ||
891 | /* Not loopback addresses on loopback should be preferred | |
892 | in this case. It is importnat that lo is the first interface | |
893 | in dev_base list. | |
894 | */ | |
895 | for_each_netdev_rcu(net, dev) { | |
896 | in_dev = __in_dev_get_rcu(dev); | |
897 | if (!in_dev) | |
898 | continue; | |
899 | ||
900 | for_primary_ifa(in_dev) { | |
901 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
902 | ifa->ifa_scope <= scope) { | |
903 | addr = ifa->ifa_local; | |
904 | goto out_unlock; | |
905 | } | |
906 | } endfor_ifa(in_dev); | |
907 | } | |
908 | out_unlock: | |
909 | rcu_read_unlock(); | |
910 | return addr; | |
911 | } | |
912 | EXPORT_SYMBOL(inet_select_addr); | |
913 | ||
914 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, | |
915 | __be32 local, int scope) | |
916 | { | |
917 | int same = 0; | |
918 | __be32 addr = 0; | |
919 | ||
920 | for_ifa(in_dev) { | |
921 | if (!addr && | |
922 | (local == ifa->ifa_local || !local) && | |
923 | ifa->ifa_scope <= scope) { | |
924 | addr = ifa->ifa_local; | |
925 | if (same) | |
926 | break; | |
927 | } | |
928 | if (!same) { | |
929 | same = (!local || inet_ifa_match(local, ifa)) && | |
930 | (!dst || inet_ifa_match(dst, ifa)); | |
931 | if (same && addr) { | |
932 | if (local || !dst) | |
933 | break; | |
934 | /* Is the selected addr into dst subnet? */ | |
935 | if (inet_ifa_match(addr, ifa)) | |
936 | break; | |
937 | /* No, then can we use new local src? */ | |
938 | if (ifa->ifa_scope <= scope) { | |
939 | addr = ifa->ifa_local; | |
940 | break; | |
941 | } | |
942 | /* search for large dst subnet for addr */ | |
943 | same = 0; | |
944 | } | |
945 | } | |
946 | } endfor_ifa(in_dev); | |
947 | ||
948 | return same ? addr : 0; | |
949 | } | |
950 | ||
951 | /* | |
952 | * Confirm that local IP address exists using wildcards: | |
953 | * - in_dev: only on this interface, 0=any interface | |
954 | * - dst: only in the same subnet as dst, 0=any dst | |
955 | * - local: address, 0=autoselect the local address | |
956 | * - scope: maximum allowed scope value for the local address | |
957 | */ | |
958 | __be32 inet_confirm_addr(struct in_device *in_dev, | |
959 | __be32 dst, __be32 local, int scope) | |
960 | { | |
961 | __be32 addr = 0; | |
962 | struct net_device *dev; | |
963 | struct net *net; | |
964 | ||
965 | if (scope != RT_SCOPE_LINK) | |
966 | return confirm_addr_indev(in_dev, dst, local, scope); | |
967 | ||
968 | net = dev_net(in_dev->dev); | |
969 | rcu_read_lock(); | |
970 | for_each_netdev_rcu(net, dev) { | |
971 | in_dev = __in_dev_get_rcu(dev); | |
972 | if (in_dev) { | |
973 | addr = confirm_addr_indev(in_dev, dst, local, scope); | |
974 | if (addr) | |
975 | break; | |
976 | } | |
977 | } | |
978 | rcu_read_unlock(); | |
979 | ||
980 | return addr; | |
981 | } | |
982 | ||
983 | /* | |
984 | * Device notifier | |
985 | */ | |
986 | ||
987 | int register_inetaddr_notifier(struct notifier_block *nb) | |
988 | { | |
989 | return blocking_notifier_chain_register(&inetaddr_chain, nb); | |
990 | } | |
991 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
992 | ||
993 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
994 | { | |
995 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); | |
996 | } | |
997 | EXPORT_SYMBOL(unregister_inetaddr_notifier); | |
998 | ||
999 | /* Rename ifa_labels for a device name change. Make some effort to preserve | |
1000 | * existing alias numbering and to create unique labels if possible. | |
1001 | */ | |
1002 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
1003 | { | |
1004 | struct in_ifaddr *ifa; | |
1005 | int named = 0; | |
1006 | ||
1007 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
1008 | char old[IFNAMSIZ], *dot; | |
1009 | ||
1010 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
1011 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1012 | if (named++ == 0) | |
1013 | goto skip; | |
1014 | dot = strchr(old, ':'); | |
1015 | if (dot == NULL) { | |
1016 | sprintf(old, ":%d", named); | |
1017 | dot = old; | |
1018 | } | |
1019 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) | |
1020 | strcat(ifa->ifa_label, dot); | |
1021 | else | |
1022 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
1023 | skip: | |
1024 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | static inline bool inetdev_valid_mtu(unsigned mtu) | |
1029 | { | |
1030 | return mtu >= 68; | |
1031 | } | |
1032 | ||
1033 | /* Called only under RTNL semaphore */ | |
1034 | ||
1035 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1036 | void *ptr) | |
1037 | { | |
1038 | struct net_device *dev = ptr; | |
1039 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
1040 | ||
1041 | ASSERT_RTNL(); | |
1042 | ||
1043 | if (!in_dev) { | |
1044 | if (event == NETDEV_REGISTER) { | |
1045 | in_dev = inetdev_init(dev); | |
1046 | if (!in_dev) | |
1047 | return notifier_from_errno(-ENOMEM); | |
1048 | if (dev->flags & IFF_LOOPBACK) { | |
1049 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); | |
1050 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
1051 | } | |
1052 | } else if (event == NETDEV_CHANGEMTU) { | |
1053 | /* Re-enabling IP */ | |
1054 | if (inetdev_valid_mtu(dev->mtu)) | |
1055 | in_dev = inetdev_init(dev); | |
1056 | } | |
1057 | goto out; | |
1058 | } | |
1059 | ||
1060 | switch (event) { | |
1061 | case NETDEV_REGISTER: | |
1062 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1063 | rcu_assign_pointer(dev->ip_ptr, NULL); | |
1064 | break; | |
1065 | case NETDEV_UP: | |
1066 | if (!inetdev_valid_mtu(dev->mtu)) | |
1067 | break; | |
1068 | if (dev->flags & IFF_LOOPBACK) { | |
1069 | struct in_ifaddr *ifa = inet_alloc_ifa(); | |
1070 | ||
1071 | if (ifa) { | |
1072 | ifa->ifa_local = | |
1073 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1074 | ifa->ifa_prefixlen = 8; | |
1075 | ifa->ifa_mask = inet_make_mask(8); | |
1076 | in_dev_hold(in_dev); | |
1077 | ifa->ifa_dev = in_dev; | |
1078 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1079 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1080 | inet_insert_ifa(ifa); | |
1081 | } | |
1082 | } | |
1083 | ip_mc_up(in_dev); | |
1084 | /* fall through */ | |
1085 | case NETDEV_NOTIFY_PEERS: | |
1086 | case NETDEV_CHANGEADDR: | |
1087 | /* Send gratuitous ARP to notify of link change */ | |
1088 | if (IN_DEV_ARP_NOTIFY(in_dev)) { | |
1089 | struct in_ifaddr *ifa = in_dev->ifa_list; | |
1090 | ||
1091 | if (ifa) | |
1092 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1093 | ifa->ifa_address, dev, | |
1094 | ifa->ifa_address, NULL, | |
1095 | dev->dev_addr, NULL); | |
1096 | } | |
1097 | break; | |
1098 | case NETDEV_DOWN: | |
1099 | ip_mc_down(in_dev); | |
1100 | break; | |
1101 | case NETDEV_PRE_TYPE_CHANGE: | |
1102 | ip_mc_unmap(in_dev); | |
1103 | break; | |
1104 | case NETDEV_POST_TYPE_CHANGE: | |
1105 | ip_mc_remap(in_dev); | |
1106 | break; | |
1107 | case NETDEV_CHANGEMTU: | |
1108 | if (inetdev_valid_mtu(dev->mtu)) | |
1109 | break; | |
1110 | /* disable IP when MTU is not enough */ | |
1111 | case NETDEV_UNREGISTER: | |
1112 | inetdev_destroy(in_dev); | |
1113 | break; | |
1114 | case NETDEV_CHANGENAME: | |
1115 | /* Do not notify about label change, this event is | |
1116 | * not interesting to applications using netlink. | |
1117 | */ | |
1118 | inetdev_changename(dev, in_dev); | |
1119 | ||
1120 | devinet_sysctl_unregister(in_dev); | |
1121 | devinet_sysctl_register(in_dev); | |
1122 | break; | |
1123 | } | |
1124 | out: | |
1125 | return NOTIFY_DONE; | |
1126 | } | |
1127 | ||
1128 | static struct notifier_block ip_netdev_notifier = { | |
1129 | .notifier_call = inetdev_event, | |
1130 | }; | |
1131 | ||
1132 | static inline size_t inet_nlmsg_size(void) | |
1133 | { | |
1134 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1135 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1136 | + nla_total_size(4) /* IFA_LOCAL */ | |
1137 | + nla_total_size(4) /* IFA_BROADCAST */ | |
1138 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ | |
1139 | } | |
1140 | ||
1141 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, | |
1142 | u32 pid, u32 seq, int event, unsigned int flags) | |
1143 | { | |
1144 | struct ifaddrmsg *ifm; | |
1145 | struct nlmsghdr *nlh; | |
1146 | ||
1147 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); | |
1148 | if (nlh == NULL) | |
1149 | return -EMSGSIZE; | |
1150 | ||
1151 | ifm = nlmsg_data(nlh); | |
1152 | ifm->ifa_family = AF_INET; | |
1153 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1154 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1155 | ifm->ifa_scope = ifa->ifa_scope; | |
1156 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
1157 | ||
1158 | if (ifa->ifa_address) | |
1159 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); | |
1160 | ||
1161 | if (ifa->ifa_local) | |
1162 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); | |
1163 | ||
1164 | if (ifa->ifa_broadcast) | |
1165 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); | |
1166 | ||
1167 | if (ifa->ifa_label[0]) | |
1168 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); | |
1169 | ||
1170 | return nlmsg_end(skb, nlh); | |
1171 | ||
1172 | nla_put_failure: | |
1173 | nlmsg_cancel(skb, nlh); | |
1174 | return -EMSGSIZE; | |
1175 | } | |
1176 | ||
1177 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1178 | { | |
1179 | struct net *net = sock_net(skb->sk); | |
1180 | int h, s_h; | |
1181 | int idx, s_idx; | |
1182 | int ip_idx, s_ip_idx; | |
1183 | struct net_device *dev; | |
1184 | struct in_device *in_dev; | |
1185 | struct in_ifaddr *ifa; | |
1186 | struct hlist_head *head; | |
1187 | struct hlist_node *node; | |
1188 | ||
1189 | s_h = cb->args[0]; | |
1190 | s_idx = idx = cb->args[1]; | |
1191 | s_ip_idx = ip_idx = cb->args[2]; | |
1192 | ||
1193 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1194 | idx = 0; | |
1195 | head = &net->dev_index_head[h]; | |
1196 | rcu_read_lock(); | |
1197 | hlist_for_each_entry_rcu(dev, node, head, index_hlist) { | |
1198 | if (idx < s_idx) | |
1199 | goto cont; | |
1200 | if (h > s_h || idx > s_idx) | |
1201 | s_ip_idx = 0; | |
1202 | in_dev = __in_dev_get_rcu(dev); | |
1203 | if (!in_dev) | |
1204 | goto cont; | |
1205 | ||
1206 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1207 | ifa = ifa->ifa_next, ip_idx++) { | |
1208 | if (ip_idx < s_ip_idx) | |
1209 | continue; | |
1210 | if (inet_fill_ifaddr(skb, ifa, | |
1211 | NETLINK_CB(cb->skb).pid, | |
1212 | cb->nlh->nlmsg_seq, | |
1213 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { | |
1214 | rcu_read_unlock(); | |
1215 | goto done; | |
1216 | } | |
1217 | } | |
1218 | cont: | |
1219 | idx++; | |
1220 | } | |
1221 | rcu_read_unlock(); | |
1222 | } | |
1223 | ||
1224 | done: | |
1225 | cb->args[0] = h; | |
1226 | cb->args[1] = idx; | |
1227 | cb->args[2] = ip_idx; | |
1228 | ||
1229 | return skb->len; | |
1230 | } | |
1231 | ||
1232 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
1233 | u32 pid) | |
1234 | { | |
1235 | struct sk_buff *skb; | |
1236 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
1237 | int err = -ENOBUFS; | |
1238 | struct net *net; | |
1239 | ||
1240 | net = dev_net(ifa->ifa_dev->dev); | |
1241 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); | |
1242 | if (skb == NULL) | |
1243 | goto errout; | |
1244 | ||
1245 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
1246 | if (err < 0) { | |
1247 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1248 | WARN_ON(err == -EMSGSIZE); | |
1249 | kfree_skb(skb); | |
1250 | goto errout; | |
1251 | } | |
1252 | rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); | |
1253 | return; | |
1254 | errout: | |
1255 | if (err < 0) | |
1256 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); | |
1257 | } | |
1258 | ||
1259 | static size_t inet_get_link_af_size(const struct net_device *dev) | |
1260 | { | |
1261 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
1262 | ||
1263 | if (!in_dev) | |
1264 | return 0; | |
1265 | ||
1266 | return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ | |
1267 | } | |
1268 | ||
1269 | static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev) | |
1270 | { | |
1271 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
1272 | struct nlattr *nla; | |
1273 | int i; | |
1274 | ||
1275 | if (!in_dev) | |
1276 | return -ENODATA; | |
1277 | ||
1278 | nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); | |
1279 | if (nla == NULL) | |
1280 | return -EMSGSIZE; | |
1281 | ||
1282 | for (i = 0; i < IPV4_DEVCONF_MAX; i++) | |
1283 | ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; | |
1284 | ||
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { | |
1289 | [IFLA_INET_CONF] = { .type = NLA_NESTED }, | |
1290 | }; | |
1291 | ||
1292 | static int inet_parse_link_af(struct net_device *dev, const struct nlattr *nla) | |
1293 | { | |
1294 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
1295 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; | |
1296 | int err, rem; | |
1297 | ||
1298 | if (!in_dev) | |
1299 | return -EOPNOTSUPP; | |
1300 | ||
1301 | err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); | |
1302 | if (err < 0) | |
1303 | return err; | |
1304 | ||
1305 | if (tb[IFLA_INET_CONF]) { | |
1306 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { | |
1307 | int cfgid = nla_type(a); | |
1308 | ||
1309 | if (nla_len(a) < 4) | |
1310 | return -EINVAL; | |
1311 | ||
1312 | if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) | |
1313 | return -EINVAL; | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | if (tb[IFLA_INET_CONF]) { | |
1318 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) | |
1319 | ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); | |
1320 | } | |
1321 | ||
1322 | return 0; | |
1323 | } | |
1324 | ||
1325 | #ifdef CONFIG_SYSCTL | |
1326 | ||
1327 | static void devinet_copy_dflt_conf(struct net *net, int i) | |
1328 | { | |
1329 | struct net_device *dev; | |
1330 | ||
1331 | rcu_read_lock(); | |
1332 | for_each_netdev_rcu(net, dev) { | |
1333 | struct in_device *in_dev; | |
1334 | ||
1335 | in_dev = __in_dev_get_rcu(dev); | |
1336 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
1337 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; | |
1338 | } | |
1339 | rcu_read_unlock(); | |
1340 | } | |
1341 | ||
1342 | /* called with RTNL locked */ | |
1343 | static void inet_forward_change(struct net *net) | |
1344 | { | |
1345 | struct net_device *dev; | |
1346 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); | |
1347 | ||
1348 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; | |
1349 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; | |
1350 | ||
1351 | for_each_netdev(net, dev) { | |
1352 | struct in_device *in_dev; | |
1353 | if (on) | |
1354 | dev_disable_lro(dev); | |
1355 | rcu_read_lock(); | |
1356 | in_dev = __in_dev_get_rcu(dev); | |
1357 | if (in_dev) | |
1358 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1359 | rcu_read_unlock(); | |
1360 | } | |
1361 | } | |
1362 | ||
1363 | static int devinet_conf_proc(ctl_table *ctl, int write, | |
1364 | void __user *buffer, | |
1365 | size_t *lenp, loff_t *ppos) | |
1366 | { | |
1367 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
1368 | ||
1369 | if (write) { | |
1370 | struct ipv4_devconf *cnf = ctl->extra1; | |
1371 | struct net *net = ctl->extra2; | |
1372 | int i = (int *)ctl->data - cnf->data; | |
1373 | ||
1374 | set_bit(i, cnf->state); | |
1375 | ||
1376 | if (cnf == net->ipv4.devconf_dflt) | |
1377 | devinet_copy_dflt_conf(net, i); | |
1378 | } | |
1379 | ||
1380 | return ret; | |
1381 | } | |
1382 | ||
1383 | static int devinet_sysctl_forward(ctl_table *ctl, int write, | |
1384 | void __user *buffer, | |
1385 | size_t *lenp, loff_t *ppos) | |
1386 | { | |
1387 | int *valp = ctl->data; | |
1388 | int val = *valp; | |
1389 | loff_t pos = *ppos; | |
1390 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
1391 | ||
1392 | if (write && *valp != val) { | |
1393 | struct net *net = ctl->extra2; | |
1394 | ||
1395 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { | |
1396 | if (!rtnl_trylock()) { | |
1397 | /* Restore the original values before restarting */ | |
1398 | *valp = val; | |
1399 | *ppos = pos; | |
1400 | return restart_syscall(); | |
1401 | } | |
1402 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { | |
1403 | inet_forward_change(net); | |
1404 | } else if (*valp) { | |
1405 | struct ipv4_devconf *cnf = ctl->extra1; | |
1406 | struct in_device *idev = | |
1407 | container_of(cnf, struct in_device, cnf); | |
1408 | dev_disable_lro(idev->dev); | |
1409 | } | |
1410 | rtnl_unlock(); | |
1411 | rt_cache_flush(net, 0); | |
1412 | } | |
1413 | } | |
1414 | ||
1415 | return ret; | |
1416 | } | |
1417 | ||
1418 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
1419 | void __user *buffer, | |
1420 | size_t *lenp, loff_t *ppos) | |
1421 | { | |
1422 | int *valp = ctl->data; | |
1423 | int val = *valp; | |
1424 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
1425 | struct net *net = ctl->extra2; | |
1426 | ||
1427 | if (write && *valp != val) | |
1428 | rt_cache_flush(net, 0); | |
1429 | ||
1430 | return ret; | |
1431 | } | |
1432 | ||
1433 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ | |
1434 | { \ | |
1435 | .procname = name, \ | |
1436 | .data = ipv4_devconf.data + \ | |
1437 | IPV4_DEVCONF_ ## attr - 1, \ | |
1438 | .maxlen = sizeof(int), \ | |
1439 | .mode = mval, \ | |
1440 | .proc_handler = proc, \ | |
1441 | .extra1 = &ipv4_devconf, \ | |
1442 | } | |
1443 | ||
1444 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
1445 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) | |
1446 | ||
1447 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
1448 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) | |
1449 | ||
1450 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ | |
1451 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
1452 | ||
1453 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
1454 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) | |
1455 | ||
1456 | static struct devinet_sysctl_table { | |
1457 | struct ctl_table_header *sysctl_header; | |
1458 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; | |
1459 | char *dev_name; | |
1460 | } devinet_sysctl = { | |
1461 | .devinet_vars = { | |
1462 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", | |
1463 | devinet_sysctl_forward), | |
1464 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), | |
1465 | ||
1466 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1467 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1468 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1469 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1470 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1471 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1472 | "accept_source_route"), | |
1473 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), | |
1474 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), | |
1475 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), | |
1476 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1477 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1478 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1479 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1480 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1481 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1482 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1483 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
1484 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), | |
1485 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), | |
1486 | ||
1487 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1488 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1489 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1490 | "force_igmp_version"), | |
1491 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1492 | "promote_secondaries"), | |
1493 | }, | |
1494 | }; | |
1495 | ||
1496 | static int __devinet_sysctl_register(struct net *net, char *dev_name, | |
1497 | struct ipv4_devconf *p) | |
1498 | { | |
1499 | int i; | |
1500 | struct devinet_sysctl_table *t; | |
1501 | ||
1502 | #define DEVINET_CTL_PATH_DEV 3 | |
1503 | ||
1504 | struct ctl_path devinet_ctl_path[] = { | |
1505 | { .procname = "net", }, | |
1506 | { .procname = "ipv4", }, | |
1507 | { .procname = "conf", }, | |
1508 | { /* to be set */ }, | |
1509 | { }, | |
1510 | }; | |
1511 | ||
1512 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); | |
1513 | if (!t) | |
1514 | goto out; | |
1515 | ||
1516 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { | |
1517 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
1518 | t->devinet_vars[i].extra1 = p; | |
1519 | t->devinet_vars[i].extra2 = net; | |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1524 | * by sysctl and we wouldn't want anyone to change it under our feet | |
1525 | * (see SIOCSIFNAME). | |
1526 | */ | |
1527 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); | |
1528 | if (!t->dev_name) | |
1529 | goto free; | |
1530 | ||
1531 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; | |
1532 | ||
1533 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, | |
1534 | t->devinet_vars); | |
1535 | if (!t->sysctl_header) | |
1536 | goto free_procname; | |
1537 | ||
1538 | p->sysctl = t; | |
1539 | return 0; | |
1540 | ||
1541 | free_procname: | |
1542 | kfree(t->dev_name); | |
1543 | free: | |
1544 | kfree(t); | |
1545 | out: | |
1546 | return -ENOBUFS; | |
1547 | } | |
1548 | ||
1549 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) | |
1550 | { | |
1551 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1552 | ||
1553 | if (t == NULL) | |
1554 | return; | |
1555 | ||
1556 | cnf->sysctl = NULL; | |
1557 | unregister_sysctl_table(t->sysctl_header); | |
1558 | kfree(t->dev_name); | |
1559 | kfree(t); | |
1560 | } | |
1561 | ||
1562 | static void devinet_sysctl_register(struct in_device *idev) | |
1563 | { | |
1564 | neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL); | |
1565 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, | |
1566 | &idev->cnf); | |
1567 | } | |
1568 | ||
1569 | static void devinet_sysctl_unregister(struct in_device *idev) | |
1570 | { | |
1571 | __devinet_sysctl_unregister(&idev->cnf); | |
1572 | neigh_sysctl_unregister(idev->arp_parms); | |
1573 | } | |
1574 | ||
1575 | static struct ctl_table ctl_forward_entry[] = { | |
1576 | { | |
1577 | .procname = "ip_forward", | |
1578 | .data = &ipv4_devconf.data[ | |
1579 | IPV4_DEVCONF_FORWARDING - 1], | |
1580 | .maxlen = sizeof(int), | |
1581 | .mode = 0644, | |
1582 | .proc_handler = devinet_sysctl_forward, | |
1583 | .extra1 = &ipv4_devconf, | |
1584 | .extra2 = &init_net, | |
1585 | }, | |
1586 | { }, | |
1587 | }; | |
1588 | ||
1589 | static __net_initdata struct ctl_path net_ipv4_path[] = { | |
1590 | { .procname = "net", }, | |
1591 | { .procname = "ipv4", }, | |
1592 | { }, | |
1593 | }; | |
1594 | #endif | |
1595 | ||
1596 | static __net_init int devinet_init_net(struct net *net) | |
1597 | { | |
1598 | int err; | |
1599 | struct ipv4_devconf *all, *dflt; | |
1600 | #ifdef CONFIG_SYSCTL | |
1601 | struct ctl_table *tbl = ctl_forward_entry; | |
1602 | struct ctl_table_header *forw_hdr; | |
1603 | #endif | |
1604 | ||
1605 | err = -ENOMEM; | |
1606 | all = &ipv4_devconf; | |
1607 | dflt = &ipv4_devconf_dflt; | |
1608 | ||
1609 | if (!net_eq(net, &init_net)) { | |
1610 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); | |
1611 | if (all == NULL) | |
1612 | goto err_alloc_all; | |
1613 | ||
1614 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1615 | if (dflt == NULL) | |
1616 | goto err_alloc_dflt; | |
1617 | ||
1618 | #ifdef CONFIG_SYSCTL | |
1619 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); | |
1620 | if (tbl == NULL) | |
1621 | goto err_alloc_ctl; | |
1622 | ||
1623 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; | |
1624 | tbl[0].extra1 = all; | |
1625 | tbl[0].extra2 = net; | |
1626 | #endif | |
1627 | } | |
1628 | ||
1629 | #ifdef CONFIG_SYSCTL | |
1630 | err = __devinet_sysctl_register(net, "all", all); | |
1631 | if (err < 0) | |
1632 | goto err_reg_all; | |
1633 | ||
1634 | err = __devinet_sysctl_register(net, "default", dflt); | |
1635 | if (err < 0) | |
1636 | goto err_reg_dflt; | |
1637 | ||
1638 | err = -ENOMEM; | |
1639 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1640 | if (forw_hdr == NULL) | |
1641 | goto err_reg_ctl; | |
1642 | net->ipv4.forw_hdr = forw_hdr; | |
1643 | #endif | |
1644 | ||
1645 | net->ipv4.devconf_all = all; | |
1646 | net->ipv4.devconf_dflt = dflt; | |
1647 | return 0; | |
1648 | ||
1649 | #ifdef CONFIG_SYSCTL | |
1650 | err_reg_ctl: | |
1651 | __devinet_sysctl_unregister(dflt); | |
1652 | err_reg_dflt: | |
1653 | __devinet_sysctl_unregister(all); | |
1654 | err_reg_all: | |
1655 | if (tbl != ctl_forward_entry) | |
1656 | kfree(tbl); | |
1657 | err_alloc_ctl: | |
1658 | #endif | |
1659 | if (dflt != &ipv4_devconf_dflt) | |
1660 | kfree(dflt); | |
1661 | err_alloc_dflt: | |
1662 | if (all != &ipv4_devconf) | |
1663 | kfree(all); | |
1664 | err_alloc_all: | |
1665 | return err; | |
1666 | } | |
1667 | ||
1668 | static __net_exit void devinet_exit_net(struct net *net) | |
1669 | { | |
1670 | #ifdef CONFIG_SYSCTL | |
1671 | struct ctl_table *tbl; | |
1672 | ||
1673 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
1674 | unregister_net_sysctl_table(net->ipv4.forw_hdr); | |
1675 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1676 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
1677 | kfree(tbl); | |
1678 | #endif | |
1679 | kfree(net->ipv4.devconf_dflt); | |
1680 | kfree(net->ipv4.devconf_all); | |
1681 | } | |
1682 | ||
1683 | static __net_initdata struct pernet_operations devinet_ops = { | |
1684 | .init = devinet_init_net, | |
1685 | .exit = devinet_exit_net, | |
1686 | }; | |
1687 | ||
1688 | static struct rtnl_af_ops inet_af_ops = { | |
1689 | .family = AF_INET, | |
1690 | .fill_link_af = inet_fill_link_af, | |
1691 | .get_link_af_size = inet_get_link_af_size, | |
1692 | .parse_link_af = inet_parse_link_af, | |
1693 | }; | |
1694 | ||
1695 | void __init devinet_init(void) | |
1696 | { | |
1697 | register_pernet_subsys(&devinet_ops); | |
1698 | ||
1699 | register_gifconf(PF_INET, inet_gifconf); | |
1700 | register_netdevice_notifier(&ip_netdev_notifier); | |
1701 | ||
1702 | rtnl_af_register(&inet_af_ops); | |
1703 | ||
1704 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); | |
1705 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1706 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1707 | } | |
1708 |