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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Anycast support for IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
6 | * David L Stevens (dlstevens@us.ibm.com) | |
7 | * | |
8 | * based heavily on net/ipv6/mcast.c | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
4fc268d2 | 16 | #include <linux/capability.h> |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/errno.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/random.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/sockios.h> | |
1da177e4 LT |
24 | #include <linux/net.h> |
25 | #include <linux/in6.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/if_arp.h> | |
28 | #include <linux/route.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/proc_fs.h> | |
31 | #include <linux/seq_file.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 | 33 | |
457c4cbc | 34 | #include <net/net_namespace.h> |
1da177e4 LT |
35 | #include <net/sock.h> |
36 | #include <net/snmp.h> | |
37 | ||
38 | #include <net/ipv6.h> | |
39 | #include <net/protocol.h> | |
40 | #include <net/if_inet6.h> | |
41 | #include <net/ndisc.h> | |
42 | #include <net/addrconf.h> | |
43 | #include <net/ip6_route.h> | |
44 | ||
45 | #include <net/checksum.h> | |
46 | ||
b71d1d42 | 47 | static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr); |
1da177e4 LT |
48 | |
49 | /* Big ac list lock for all the sockets */ | |
c33e7b05 | 50 | static DEFINE_SPINLOCK(ipv6_sk_ac_lock); |
1da177e4 | 51 | |
1da177e4 LT |
52 | |
53 | /* | |
54 | * socket join an anycast group | |
55 | */ | |
56 | ||
b71d1d42 | 57 | int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr) |
1da177e4 LT |
58 | { |
59 | struct ipv6_pinfo *np = inet6_sk(sk); | |
60 | struct net_device *dev = NULL; | |
61 | struct inet6_dev *idev; | |
62 | struct ipv6_ac_socklist *pac; | |
6ab57e7e | 63 | struct net *net = sock_net(sk); |
53b7997f | 64 | int ishost = !net->ipv6.devconf_all->forwarding; |
1da177e4 LT |
65 | int err = 0; |
66 | ||
af31f412 | 67 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
68 | return -EPERM; |
69 | if (ipv6_addr_is_multicast(addr)) | |
70 | return -EINVAL; | |
6ab57e7e | 71 | if (ipv6_chk_addr(net, addr, NULL, 0)) |
1da177e4 LT |
72 | return -EINVAL; |
73 | ||
74 | pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL); | |
75 | if (pac == NULL) | |
76 | return -ENOMEM; | |
77 | pac->acl_next = NULL; | |
4e3fd7a0 | 78 | pac->acl_addr = *addr; |
1da177e4 | 79 | |
a9ed4a29 | 80 | rtnl_lock(); |
bb69ae04 | 81 | rcu_read_lock(); |
1da177e4 LT |
82 | if (ifindex == 0) { |
83 | struct rt6_info *rt; | |
84 | ||
6ab57e7e | 85 | rt = rt6_lookup(net, addr, NULL, 0, 0); |
1da177e4 | 86 | if (rt) { |
d1918542 | 87 | dev = rt->dst.dev; |
94e187c0 | 88 | ip6_rt_put(rt); |
1da177e4 LT |
89 | } else if (ishost) { |
90 | err = -EADDRNOTAVAIL; | |
bb69ae04 | 91 | goto error; |
1da177e4 LT |
92 | } else { |
93 | /* router, no matching interface: just pick one */ | |
bb69ae04 ED |
94 | dev = dev_get_by_flags_rcu(net, IFF_UP, |
95 | IFF_UP | IFF_LOOPBACK); | |
1da177e4 LT |
96 | } |
97 | } else | |
bb69ae04 | 98 | dev = dev_get_by_index_rcu(net, ifindex); |
1da177e4 LT |
99 | |
100 | if (dev == NULL) { | |
101 | err = -ENODEV; | |
bb69ae04 | 102 | goto error; |
1da177e4 LT |
103 | } |
104 | ||
bb69ae04 | 105 | idev = __in6_dev_get(dev); |
1da177e4 LT |
106 | if (!idev) { |
107 | if (ifindex) | |
108 | err = -ENODEV; | |
109 | else | |
110 | err = -EADDRNOTAVAIL; | |
bb69ae04 | 111 | goto error; |
1da177e4 LT |
112 | } |
113 | /* reset ishost, now that we have a specific device */ | |
114 | ishost = !idev->cnf.forwarding; | |
1da177e4 LT |
115 | |
116 | pac->acl_ifindex = dev->ifindex; | |
117 | ||
118 | /* XXX | |
119 | * For hosts, allow link-local or matching prefix anycasts. | |
120 | * This obviates the need for propagating anycast routes while | |
121 | * still allowing some non-router anycast participation. | |
122 | */ | |
52eeeb84 | 123 | if (!ipv6_chk_prefix(addr, dev)) { |
1da177e4 LT |
124 | if (ishost) |
125 | err = -EADDRNOTAVAIL; | |
126 | if (err) | |
bb69ae04 | 127 | goto error; |
1da177e4 LT |
128 | } |
129 | ||
130 | err = ipv6_dev_ac_inc(dev, addr); | |
bb69ae04 | 131 | if (!err) { |
c33e7b05 | 132 | spin_lock_bh(&ipv6_sk_ac_lock); |
bb69ae04 ED |
133 | pac->acl_next = np->ipv6_ac_list; |
134 | np->ipv6_ac_list = pac; | |
c33e7b05 | 135 | spin_unlock_bh(&ipv6_sk_ac_lock); |
bb69ae04 ED |
136 | pac = NULL; |
137 | } | |
1da177e4 | 138 | |
bb69ae04 ED |
139 | error: |
140 | rcu_read_unlock(); | |
a9ed4a29 | 141 | rtnl_unlock(); |
bb69ae04 ED |
142 | if (pac) |
143 | sock_kfree_s(sk, pac, sizeof(*pac)); | |
1da177e4 LT |
144 | return err; |
145 | } | |
146 | ||
147 | /* | |
148 | * socket leave an anycast group | |
149 | */ | |
b71d1d42 | 150 | int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) |
1da177e4 LT |
151 | { |
152 | struct ipv6_pinfo *np = inet6_sk(sk); | |
153 | struct net_device *dev; | |
154 | struct ipv6_ac_socklist *pac, *prev_pac; | |
6ab57e7e | 155 | struct net *net = sock_net(sk); |
1da177e4 | 156 | |
c33e7b05 | 157 | spin_lock_bh(&ipv6_sk_ac_lock); |
1da177e4 LT |
158 | prev_pac = NULL; |
159 | for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) { | |
160 | if ((ifindex == 0 || pac->acl_ifindex == ifindex) && | |
161 | ipv6_addr_equal(&pac->acl_addr, addr)) | |
162 | break; | |
163 | prev_pac = pac; | |
164 | } | |
165 | if (!pac) { | |
c33e7b05 | 166 | spin_unlock_bh(&ipv6_sk_ac_lock); |
1da177e4 LT |
167 | return -ENOENT; |
168 | } | |
169 | if (prev_pac) | |
170 | prev_pac->acl_next = pac->acl_next; | |
171 | else | |
172 | np->ipv6_ac_list = pac->acl_next; | |
173 | ||
c33e7b05 | 174 | spin_unlock_bh(&ipv6_sk_ac_lock); |
1da177e4 | 175 | |
a9ed4a29 | 176 | rtnl_lock(); |
bb69ae04 ED |
177 | rcu_read_lock(); |
178 | dev = dev_get_by_index_rcu(net, pac->acl_ifindex); | |
179 | if (dev) | |
1da177e4 | 180 | ipv6_dev_ac_dec(dev, &pac->acl_addr); |
bb69ae04 | 181 | rcu_read_unlock(); |
a9ed4a29 | 182 | rtnl_unlock(); |
bb69ae04 | 183 | |
1da177e4 LT |
184 | sock_kfree_s(sk, pac, sizeof(*pac)); |
185 | return 0; | |
186 | } | |
187 | ||
188 | void ipv6_sock_ac_close(struct sock *sk) | |
189 | { | |
190 | struct ipv6_pinfo *np = inet6_sk(sk); | |
191 | struct net_device *dev = NULL; | |
192 | struct ipv6_ac_socklist *pac; | |
6ab57e7e | 193 | struct net *net = sock_net(sk); |
1da177e4 LT |
194 | int prev_index; |
195 | ||
0e1efe9d ED |
196 | if (!np->ipv6_ac_list) |
197 | return; | |
198 | ||
c33e7b05 | 199 | spin_lock_bh(&ipv6_sk_ac_lock); |
1da177e4 LT |
200 | pac = np->ipv6_ac_list; |
201 | np->ipv6_ac_list = NULL; | |
c33e7b05 | 202 | spin_unlock_bh(&ipv6_sk_ac_lock); |
1da177e4 LT |
203 | |
204 | prev_index = 0; | |
a9ed4a29 | 205 | rtnl_lock(); |
bb69ae04 | 206 | rcu_read_lock(); |
1da177e4 LT |
207 | while (pac) { |
208 | struct ipv6_ac_socklist *next = pac->acl_next; | |
209 | ||
210 | if (pac->acl_ifindex != prev_index) { | |
bb69ae04 | 211 | dev = dev_get_by_index_rcu(net, pac->acl_ifindex); |
1da177e4 LT |
212 | prev_index = pac->acl_ifindex; |
213 | } | |
214 | if (dev) | |
215 | ipv6_dev_ac_dec(dev, &pac->acl_addr); | |
216 | sock_kfree_s(sk, pac, sizeof(*pac)); | |
217 | pac = next; | |
218 | } | |
bb69ae04 | 219 | rcu_read_unlock(); |
a9ed4a29 | 220 | rtnl_unlock(); |
1da177e4 LT |
221 | } |
222 | ||
1da177e4 LT |
223 | static void aca_put(struct ifacaddr6 *ac) |
224 | { | |
225 | if (atomic_dec_and_test(&ac->aca_refcnt)) { | |
226 | in6_dev_put(ac->aca_idev); | |
d8d1f30b | 227 | dst_release(&ac->aca_rt->dst); |
1da177e4 LT |
228 | kfree(ac); |
229 | } | |
230 | } | |
231 | ||
232 | /* | |
233 | * device anycast group inc (add if not found) | |
234 | */ | |
b71d1d42 | 235 | int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr) |
1da177e4 LT |
236 | { |
237 | struct ifacaddr6 *aca; | |
238 | struct inet6_dev *idev; | |
239 | struct rt6_info *rt; | |
240 | int err; | |
241 | ||
a9ed4a29 SD |
242 | ASSERT_RTNL(); |
243 | ||
1da177e4 LT |
244 | idev = in6_dev_get(dev); |
245 | ||
246 | if (idev == NULL) | |
247 | return -EINVAL; | |
248 | ||
249 | write_lock_bh(&idev->lock); | |
250 | if (idev->dead) { | |
251 | err = -ENODEV; | |
252 | goto out; | |
253 | } | |
254 | ||
255 | for (aca = idev->ac_list; aca; aca = aca->aca_next) { | |
256 | if (ipv6_addr_equal(&aca->aca_addr, addr)) { | |
257 | aca->aca_users++; | |
258 | err = 0; | |
259 | goto out; | |
260 | } | |
261 | } | |
262 | ||
263 | /* | |
264 | * not found: create a new one. | |
265 | */ | |
266 | ||
0c600eda | 267 | aca = kzalloc(sizeof(struct ifacaddr6), GFP_ATOMIC); |
1da177e4 LT |
268 | |
269 | if (aca == NULL) { | |
270 | err = -ENOMEM; | |
271 | goto out; | |
272 | } | |
273 | ||
8f031519 | 274 | rt = addrconf_dst_alloc(idev, addr, true); |
1da177e4 LT |
275 | if (IS_ERR(rt)) { |
276 | kfree(aca); | |
277 | err = PTR_ERR(rt); | |
278 | goto out; | |
279 | } | |
280 | ||
4e3fd7a0 | 281 | aca->aca_addr = *addr; |
1da177e4 LT |
282 | aca->aca_idev = idev; |
283 | aca->aca_rt = rt; | |
284 | aca->aca_users = 1; | |
285 | /* aca_tstamp should be updated upon changes */ | |
286 | aca->aca_cstamp = aca->aca_tstamp = jiffies; | |
287 | atomic_set(&aca->aca_refcnt, 2); | |
288 | spin_lock_init(&aca->aca_lock); | |
289 | ||
290 | aca->aca_next = idev->ac_list; | |
291 | idev->ac_list = aca; | |
292 | write_unlock_bh(&idev->lock); | |
293 | ||
84f59370 | 294 | ip6_ins_rt(rt); |
1da177e4 LT |
295 | |
296 | addrconf_join_solict(dev, &aca->aca_addr); | |
297 | ||
298 | aca_put(aca); | |
299 | return 0; | |
300 | out: | |
301 | write_unlock_bh(&idev->lock); | |
302 | in6_dev_put(idev); | |
303 | return err; | |
304 | } | |
305 | ||
306 | /* | |
307 | * device anycast group decrement | |
308 | */ | |
b71d1d42 | 309 | int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr) |
1da177e4 LT |
310 | { |
311 | struct ifacaddr6 *aca, *prev_aca; | |
312 | ||
a9ed4a29 SD |
313 | ASSERT_RTNL(); |
314 | ||
1da177e4 LT |
315 | write_lock_bh(&idev->lock); |
316 | prev_aca = NULL; | |
317 | for (aca = idev->ac_list; aca; aca = aca->aca_next) { | |
318 | if (ipv6_addr_equal(&aca->aca_addr, addr)) | |
319 | break; | |
320 | prev_aca = aca; | |
321 | } | |
322 | if (!aca) { | |
323 | write_unlock_bh(&idev->lock); | |
324 | return -ENOENT; | |
325 | } | |
326 | if (--aca->aca_users > 0) { | |
327 | write_unlock_bh(&idev->lock); | |
328 | return 0; | |
329 | } | |
330 | if (prev_aca) | |
331 | prev_aca->aca_next = aca->aca_next; | |
332 | else | |
333 | idev->ac_list = aca->aca_next; | |
334 | write_unlock_bh(&idev->lock); | |
335 | addrconf_leave_solict(idev, &aca->aca_addr); | |
336 | ||
d8d1f30b | 337 | dst_hold(&aca->aca_rt->dst); |
84f59370 | 338 | ip6_del_rt(aca->aca_rt); |
1da177e4 LT |
339 | |
340 | aca_put(aca); | |
341 | return 0; | |
342 | } | |
343 | ||
bb69ae04 | 344 | /* called with rcu_read_lock() */ |
b71d1d42 | 345 | static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr) |
1da177e4 | 346 | { |
bb69ae04 ED |
347 | struct inet6_dev *idev = __in6_dev_get(dev); |
348 | ||
1da177e4 LT |
349 | if (idev == NULL) |
350 | return -ENODEV; | |
bb69ae04 | 351 | return __ipv6_dev_ac_dec(idev, addr); |
1da177e4 | 352 | } |
1ab1457c | 353 | |
1da177e4 LT |
354 | /* |
355 | * check if the interface has this anycast address | |
bb69ae04 | 356 | * called with rcu_read_lock() |
1da177e4 | 357 | */ |
a50feda5 | 358 | static bool ipv6_chk_acast_dev(struct net_device *dev, const struct in6_addr *addr) |
1da177e4 LT |
359 | { |
360 | struct inet6_dev *idev; | |
361 | struct ifacaddr6 *aca; | |
362 | ||
bb69ae04 | 363 | idev = __in6_dev_get(dev); |
1da177e4 LT |
364 | if (idev) { |
365 | read_lock_bh(&idev->lock); | |
366 | for (aca = idev->ac_list; aca; aca = aca->aca_next) | |
367 | if (ipv6_addr_equal(&aca->aca_addr, addr)) | |
368 | break; | |
369 | read_unlock_bh(&idev->lock); | |
cfcabdcc | 370 | return aca != NULL; |
1da177e4 | 371 | } |
a50feda5 | 372 | return false; |
1da177e4 LT |
373 | } |
374 | ||
375 | /* | |
376 | * check if given interface (or any, if dev==0) has this anycast address | |
377 | */ | |
a50feda5 ED |
378 | bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, |
379 | const struct in6_addr *addr) | |
1da177e4 | 380 | { |
a50feda5 | 381 | bool found = false; |
7562f876 | 382 | |
c6d14c84 | 383 | rcu_read_lock(); |
bb69ae04 ED |
384 | if (dev) |
385 | found = ipv6_chk_acast_dev(dev, addr); | |
386 | else | |
387 | for_each_netdev_rcu(net, dev) | |
388 | if (ipv6_chk_acast_dev(dev, addr)) { | |
a50feda5 | 389 | found = true; |
bb69ae04 ED |
390 | break; |
391 | } | |
c6d14c84 | 392 | rcu_read_unlock(); |
7562f876 | 393 | return found; |
1da177e4 LT |
394 | } |
395 | ||
7c90cc2d FLB |
396 | /* check if this anycast address is link-local on given interface or |
397 | * is global | |
398 | */ | |
399 | bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, | |
400 | const struct in6_addr *addr) | |
401 | { | |
402 | return ipv6_chk_acast_addr(net, | |
403 | (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL ? | |
404 | dev : NULL), | |
405 | addr); | |
406 | } | |
1da177e4 LT |
407 | |
408 | #ifdef CONFIG_PROC_FS | |
409 | struct ac6_iter_state { | |
6ab57e7e | 410 | struct seq_net_private p; |
1da177e4 LT |
411 | struct net_device *dev; |
412 | struct inet6_dev *idev; | |
413 | }; | |
414 | ||
415 | #define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private) | |
416 | ||
417 | static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq) | |
418 | { | |
419 | struct ifacaddr6 *im = NULL; | |
420 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
6ab57e7e | 421 | struct net *net = seq_file_net(seq); |
1da177e4 | 422 | |
7562f876 | 423 | state->idev = NULL; |
ce81b76a | 424 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 425 | struct inet6_dev *idev; |
ce81b76a | 426 | idev = __in6_dev_get(state->dev); |
1da177e4 LT |
427 | if (!idev) |
428 | continue; | |
429 | read_lock_bh(&idev->lock); | |
430 | im = idev->ac_list; | |
431 | if (im) { | |
432 | state->idev = idev; | |
433 | break; | |
434 | } | |
435 | read_unlock_bh(&idev->lock); | |
436 | } | |
437 | return im; | |
438 | } | |
439 | ||
440 | static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im) | |
441 | { | |
442 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
443 | ||
444 | im = im->aca_next; | |
445 | while (!im) { | |
ce81b76a | 446 | if (likely(state->idev != NULL)) |
1da177e4 | 447 | read_unlock_bh(&state->idev->lock); |
ce81b76a ED |
448 | |
449 | state->dev = next_net_device_rcu(state->dev); | |
1da177e4 LT |
450 | if (!state->dev) { |
451 | state->idev = NULL; | |
452 | break; | |
453 | } | |
ce81b76a | 454 | state->idev = __in6_dev_get(state->dev); |
1da177e4 LT |
455 | if (!state->idev) |
456 | continue; | |
457 | read_lock_bh(&state->idev->lock); | |
458 | im = state->idev->ac_list; | |
459 | } | |
460 | return im; | |
461 | } | |
462 | ||
463 | static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos) | |
464 | { | |
465 | struct ifacaddr6 *im = ac6_get_first(seq); | |
466 | if (im) | |
467 | while (pos && (im = ac6_get_next(seq, im)) != NULL) | |
468 | --pos; | |
469 | return pos ? NULL : im; | |
470 | } | |
471 | ||
472 | static void *ac6_seq_start(struct seq_file *seq, loff_t *pos) | |
ce81b76a | 473 | __acquires(RCU) |
1da177e4 | 474 | { |
ce81b76a | 475 | rcu_read_lock(); |
1da177e4 LT |
476 | return ac6_get_idx(seq, *pos); |
477 | } | |
478 | ||
479 | static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
480 | { | |
ce81b76a ED |
481 | struct ifacaddr6 *im = ac6_get_next(seq, v); |
482 | ||
1da177e4 LT |
483 | ++*pos; |
484 | return im; | |
485 | } | |
486 | ||
487 | static void ac6_seq_stop(struct seq_file *seq, void *v) | |
ce81b76a | 488 | __releases(RCU) |
1da177e4 LT |
489 | { |
490 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
ce81b76a | 491 | |
1da177e4 LT |
492 | if (likely(state->idev != NULL)) { |
493 | read_unlock_bh(&state->idev->lock); | |
ce81b76a | 494 | state->idev = NULL; |
1da177e4 | 495 | } |
ce81b76a | 496 | rcu_read_unlock(); |
1da177e4 LT |
497 | } |
498 | ||
499 | static int ac6_seq_show(struct seq_file *seq, void *v) | |
500 | { | |
501 | struct ifacaddr6 *im = (struct ifacaddr6 *)v; | |
502 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
503 | ||
4b7a4274 | 504 | seq_printf(seq, "%-4d %-15s %pi6 %5d\n", |
1da177e4 | 505 | state->dev->ifindex, state->dev->name, |
b071195d | 506 | &im->aca_addr, im->aca_users); |
1da177e4 LT |
507 | return 0; |
508 | } | |
509 | ||
56b3d975 | 510 | static const struct seq_operations ac6_seq_ops = { |
1da177e4 LT |
511 | .start = ac6_seq_start, |
512 | .next = ac6_seq_next, | |
513 | .stop = ac6_seq_stop, | |
514 | .show = ac6_seq_show, | |
515 | }; | |
516 | ||
517 | static int ac6_seq_open(struct inode *inode, struct file *file) | |
518 | { | |
6ab57e7e DL |
519 | return seq_open_net(inode, file, &ac6_seq_ops, |
520 | sizeof(struct ac6_iter_state)); | |
1da177e4 LT |
521 | } |
522 | ||
9a32144e | 523 | static const struct file_operations ac6_seq_fops = { |
1da177e4 LT |
524 | .owner = THIS_MODULE, |
525 | .open = ac6_seq_open, | |
526 | .read = seq_read, | |
527 | .llseek = seq_lseek, | |
6ab57e7e | 528 | .release = seq_release_net, |
1da177e4 LT |
529 | }; |
530 | ||
2c8c1e72 | 531 | int __net_init ac6_proc_init(struct net *net) |
1da177e4 | 532 | { |
d4beaa66 | 533 | if (!proc_create("anycast6", S_IRUGO, net->proc_net, &ac6_seq_fops)) |
1da177e4 LT |
534 | return -ENOMEM; |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
6ab57e7e | 539 | void ac6_proc_exit(struct net *net) |
1da177e4 | 540 | { |
ece31ffd | 541 | remove_proc_entry("anycast6", net->proc_net); |
1da177e4 LT |
542 | } |
543 | #endif | |
544 |