blob: 59402b4637f90d57a8be2664c921f2def94ead3b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Anycast support for IPv6
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
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
Randy Dunlap4fc268d2006-01-11 12:17:47 -080016#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020034#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#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
Eric Dumazetb71d1d42011-04-22 04:53:02 +000047static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49/* Big ac list lock for all the sockets */
50static DEFINE_RWLOCK(ipv6_sk_ac_lock);
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/*
54 * socket join an anycast group
55 */
56
Eric Dumazetb71d1d42011-04-22 04:53:02 +000057int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058{
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;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -070063 struct net *net = sock_net(sk);
YOSHIFUJI Hideaki53b79972008-07-19 22:35:03 -070064 int ishost = !net->ipv6.devconf_all->forwarding;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 int err = 0;
66
67 if (!capable(CAP_NET_ADMIN))
68 return -EPERM;
69 if (ipv6_addr_is_multicast(addr))
70 return -EINVAL;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -070071 if (ipv6_chk_addr(net, addr, NULL, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 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;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +000078 pac->acl_addr = *addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Eric Dumazetbb69ae02010-06-07 11:42:13 +000080 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 if (ifindex == 0) {
82 struct rt6_info *rt;
83
Daniel Lezcano6ab57e72008-03-26 16:52:32 -070084 rt = rt6_lookup(net, addr, NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 if (rt) {
David S. Millerd1918542011-12-28 20:19:20 -050086 dev = rt->dst.dev;
Changli Gaod8d1f302010-06-10 23:31:35 -070087 dst_release(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 } else if (ishost) {
89 err = -EADDRNOTAVAIL;
Eric Dumazetbb69ae02010-06-07 11:42:13 +000090 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 } else {
92 /* router, no matching interface: just pick one */
Eric Dumazetbb69ae02010-06-07 11:42:13 +000093 dev = dev_get_by_flags_rcu(net, IFF_UP,
94 IFF_UP | IFF_LOOPBACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 }
96 } else
Eric Dumazetbb69ae02010-06-07 11:42:13 +000097 dev = dev_get_by_index_rcu(net, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 if (dev == NULL) {
100 err = -ENODEV;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000101 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 }
103
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000104 idev = __in6_dev_get(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 if (!idev) {
106 if (ifindex)
107 err = -ENODEV;
108 else
109 err = -EADDRNOTAVAIL;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000110 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 }
112 /* reset ishost, now that we have a specific device */
113 ishost = !idev->cnf.forwarding;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115 pac->acl_ifindex = dev->ifindex;
116
117 /* XXX
118 * For hosts, allow link-local or matching prefix anycasts.
119 * This obviates the need for propagating anycast routes while
120 * still allowing some non-router anycast participation.
121 */
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400122 if (!ipv6_chk_prefix(addr, dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 if (ishost)
124 err = -EADDRNOTAVAIL;
125 if (err)
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000126 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 }
128
129 err = ipv6_dev_ac_inc(dev, addr);
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000130 if (!err) {
131 write_lock_bh(&ipv6_sk_ac_lock);
132 pac->acl_next = np->ipv6_ac_list;
133 np->ipv6_ac_list = pac;
134 write_unlock_bh(&ipv6_sk_ac_lock);
135 pac = NULL;
136 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000138error:
139 rcu_read_unlock();
140 if (pac)
141 sock_kfree_s(sk, pac, sizeof(*pac));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 return err;
143}
144
145/*
146 * socket leave an anycast group
147 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000148int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
150 struct ipv6_pinfo *np = inet6_sk(sk);
151 struct net_device *dev;
152 struct ipv6_ac_socklist *pac, *prev_pac;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700153 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155 write_lock_bh(&ipv6_sk_ac_lock);
156 prev_pac = NULL;
157 for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) {
158 if ((ifindex == 0 || pac->acl_ifindex == ifindex) &&
159 ipv6_addr_equal(&pac->acl_addr, addr))
160 break;
161 prev_pac = pac;
162 }
163 if (!pac) {
164 write_unlock_bh(&ipv6_sk_ac_lock);
165 return -ENOENT;
166 }
167 if (prev_pac)
168 prev_pac->acl_next = pac->acl_next;
169 else
170 np->ipv6_ac_list = pac->acl_next;
171
172 write_unlock_bh(&ipv6_sk_ac_lock);
173
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000174 rcu_read_lock();
175 dev = dev_get_by_index_rcu(net, pac->acl_ifindex);
176 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 ipv6_dev_ac_dec(dev, &pac->acl_addr);
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000178 rcu_read_unlock();
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 sock_kfree_s(sk, pac, sizeof(*pac));
181 return 0;
182}
183
184void ipv6_sock_ac_close(struct sock *sk)
185{
186 struct ipv6_pinfo *np = inet6_sk(sk);
187 struct net_device *dev = NULL;
188 struct ipv6_ac_socklist *pac;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700189 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 int prev_index;
191
192 write_lock_bh(&ipv6_sk_ac_lock);
193 pac = np->ipv6_ac_list;
194 np->ipv6_ac_list = NULL;
195 write_unlock_bh(&ipv6_sk_ac_lock);
196
197 prev_index = 0;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000198 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 while (pac) {
200 struct ipv6_ac_socklist *next = pac->acl_next;
201
202 if (pac->acl_ifindex != prev_index) {
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000203 dev = dev_get_by_index_rcu(net, pac->acl_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 prev_index = pac->acl_ifindex;
205 }
206 if (dev)
207 ipv6_dev_ac_dec(dev, &pac->acl_addr);
208 sock_kfree_s(sk, pac, sizeof(*pac));
209 pac = next;
210 }
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000211 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212}
213
214#if 0
215/* The function is not used, which is funny. Apparently, author
216 * supposed to use it to filter out datagrams inside udp/raw but forgot.
217 *
218 * It is OK, anycasts are not special comparing to delivery to unicasts.
219 */
220
221int inet6_ac_check(struct sock *sk, struct in6_addr *addr, int ifindex)
222{
223 struct ipv6_ac_socklist *pac;
224 struct ipv6_pinfo *np = inet6_sk(sk);
225 int found;
226
227 found = 0;
228 read_lock(&ipv6_sk_ac_lock);
229 for (pac=np->ipv6_ac_list; pac; pac=pac->acl_next) {
230 if (ifindex && pac->acl_ifindex != ifindex)
231 continue;
232 found = ipv6_addr_equal(&pac->acl_addr, addr);
233 if (found)
234 break;
235 }
236 read_unlock(&ipv6_sk_ac_lock);
237
238 return found;
239}
240
241#endif
242
243static void aca_put(struct ifacaddr6 *ac)
244{
245 if (atomic_dec_and_test(&ac->aca_refcnt)) {
246 in6_dev_put(ac->aca_idev);
Changli Gaod8d1f302010-06-10 23:31:35 -0700247 dst_release(&ac->aca_rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 kfree(ac);
249 }
250}
251
252/*
253 * device anycast group inc (add if not found)
254 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000255int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
257 struct ifacaddr6 *aca;
258 struct inet6_dev *idev;
259 struct rt6_info *rt;
260 int err;
261
262 idev = in6_dev_get(dev);
263
264 if (idev == NULL)
265 return -EINVAL;
266
267 write_lock_bh(&idev->lock);
268 if (idev->dead) {
269 err = -ENODEV;
270 goto out;
271 }
272
273 for (aca = idev->ac_list; aca; aca = aca->aca_next) {
274 if (ipv6_addr_equal(&aca->aca_addr, addr)) {
275 aca->aca_users++;
276 err = 0;
277 goto out;
278 }
279 }
280
281 /*
282 * not found: create a new one.
283 */
284
Ingo Oeser0c600ed2006-03-20 23:01:32 -0800285 aca = kzalloc(sizeof(struct ifacaddr6), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 if (aca == NULL) {
288 err = -ENOMEM;
289 goto out;
290 }
291
David S. Miller8f031512011-12-06 16:48:14 -0500292 rt = addrconf_dst_alloc(idev, addr, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 if (IS_ERR(rt)) {
294 kfree(aca);
295 err = PTR_ERR(rt);
296 goto out;
297 }
298
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000299 aca->aca_addr = *addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 aca->aca_idev = idev;
301 aca->aca_rt = rt;
302 aca->aca_users = 1;
303 /* aca_tstamp should be updated upon changes */
304 aca->aca_cstamp = aca->aca_tstamp = jiffies;
305 atomic_set(&aca->aca_refcnt, 2);
306 spin_lock_init(&aca->aca_lock);
307
308 aca->aca_next = idev->ac_list;
309 idev->ac_list = aca;
310 write_unlock_bh(&idev->lock);
311
Denis V. Lunev84f59372008-04-03 13:33:00 -0700312 ip6_ins_rt(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314 addrconf_join_solict(dev, &aca->aca_addr);
315
316 aca_put(aca);
317 return 0;
318out:
319 write_unlock_bh(&idev->lock);
320 in6_dev_put(idev);
321 return err;
322}
323
324/*
325 * device anycast group decrement
326 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000327int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328{
329 struct ifacaddr6 *aca, *prev_aca;
330
331 write_lock_bh(&idev->lock);
332 prev_aca = NULL;
333 for (aca = idev->ac_list; aca; aca = aca->aca_next) {
334 if (ipv6_addr_equal(&aca->aca_addr, addr))
335 break;
336 prev_aca = aca;
337 }
338 if (!aca) {
339 write_unlock_bh(&idev->lock);
340 return -ENOENT;
341 }
342 if (--aca->aca_users > 0) {
343 write_unlock_bh(&idev->lock);
344 return 0;
345 }
346 if (prev_aca)
347 prev_aca->aca_next = aca->aca_next;
348 else
349 idev->ac_list = aca->aca_next;
350 write_unlock_bh(&idev->lock);
351 addrconf_leave_solict(idev, &aca->aca_addr);
352
Changli Gaod8d1f302010-06-10 23:31:35 -0700353 dst_hold(&aca->aca_rt->dst);
Denis V. Lunev84f59372008-04-03 13:33:00 -0700354 ip6_del_rt(aca->aca_rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 aca_put(aca);
357 return 0;
358}
359
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000360/* called with rcu_read_lock() */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000361static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362{
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000363 struct inet6_dev *idev = __in6_dev_get(dev);
364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 if (idev == NULL)
366 return -ENODEV;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000367 return __ipv6_dev_ac_dec(idev, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368}
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370/*
371 * check if the interface has this anycast address
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000372 * called with rcu_read_lock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000374static int ipv6_chk_acast_dev(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
376 struct inet6_dev *idev;
377 struct ifacaddr6 *aca;
378
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000379 idev = __in6_dev_get(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 if (idev) {
381 read_lock_bh(&idev->lock);
382 for (aca = idev->ac_list; aca; aca = aca->aca_next)
383 if (ipv6_addr_equal(&aca->aca_addr, addr))
384 break;
385 read_unlock_bh(&idev->lock);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700386 return aca != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 }
388 return 0;
389}
390
391/*
392 * check if given interface (or any, if dev==0) has this anycast address
393 */
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700394int ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000395 const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396{
Pavel Emelianov7562f872007-05-03 15:13:45 -0700397 int found = 0;
398
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800399 rcu_read_lock();
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000400 if (dev)
401 found = ipv6_chk_acast_dev(dev, addr);
402 else
403 for_each_netdev_rcu(net, dev)
404 if (ipv6_chk_acast_dev(dev, addr)) {
405 found = 1;
406 break;
407 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800408 rcu_read_unlock();
Pavel Emelianov7562f872007-05-03 15:13:45 -0700409 return found;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
411
412
413#ifdef CONFIG_PROC_FS
414struct ac6_iter_state {
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700415 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 struct net_device *dev;
417 struct inet6_dev *idev;
418};
419
420#define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private)
421
422static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq)
423{
424 struct ifacaddr6 *im = NULL;
425 struct ac6_iter_state *state = ac6_seq_private(seq);
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700426 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Pavel Emelianov7562f872007-05-03 15:13:45 -0700428 state->idev = NULL;
Eric Dumazetce81b762009-11-11 17:34:30 +0000429 for_each_netdev_rcu(net, state->dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 struct inet6_dev *idev;
Eric Dumazetce81b762009-11-11 17:34:30 +0000431 idev = __in6_dev_get(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 if (!idev)
433 continue;
434 read_lock_bh(&idev->lock);
435 im = idev->ac_list;
436 if (im) {
437 state->idev = idev;
438 break;
439 }
440 read_unlock_bh(&idev->lock);
441 }
442 return im;
443}
444
445static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im)
446{
447 struct ac6_iter_state *state = ac6_seq_private(seq);
448
449 im = im->aca_next;
450 while (!im) {
Eric Dumazetce81b762009-11-11 17:34:30 +0000451 if (likely(state->idev != NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 read_unlock_bh(&state->idev->lock);
Eric Dumazetce81b762009-11-11 17:34:30 +0000453
454 state->dev = next_net_device_rcu(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 if (!state->dev) {
456 state->idev = NULL;
457 break;
458 }
Eric Dumazetce81b762009-11-11 17:34:30 +0000459 state->idev = __in6_dev_get(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 if (!state->idev)
461 continue;
462 read_lock_bh(&state->idev->lock);
463 im = state->idev->ac_list;
464 }
465 return im;
466}
467
468static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos)
469{
470 struct ifacaddr6 *im = ac6_get_first(seq);
471 if (im)
472 while (pos && (im = ac6_get_next(seq, im)) != NULL)
473 --pos;
474 return pos ? NULL : im;
475}
476
477static void *ac6_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazetce81b762009-11-11 17:34:30 +0000478 __acquires(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
Eric Dumazetce81b762009-11-11 17:34:30 +0000480 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 return ac6_get_idx(seq, *pos);
482}
483
484static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
485{
Eric Dumazetce81b762009-11-11 17:34:30 +0000486 struct ifacaddr6 *im = ac6_get_next(seq, v);
487
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 ++*pos;
489 return im;
490}
491
492static void ac6_seq_stop(struct seq_file *seq, void *v)
Eric Dumazetce81b762009-11-11 17:34:30 +0000493 __releases(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494{
495 struct ac6_iter_state *state = ac6_seq_private(seq);
Eric Dumazetce81b762009-11-11 17:34:30 +0000496
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 if (likely(state->idev != NULL)) {
498 read_unlock_bh(&state->idev->lock);
Eric Dumazetce81b762009-11-11 17:34:30 +0000499 state->idev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 }
Eric Dumazetce81b762009-11-11 17:34:30 +0000501 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
503
504static int ac6_seq_show(struct seq_file *seq, void *v)
505{
506 struct ifacaddr6 *im = (struct ifacaddr6 *)v;
507 struct ac6_iter_state *state = ac6_seq_private(seq);
508
Harvey Harrison4b7a4272008-10-29 12:50:24 -0700509 seq_printf(seq, "%-4d %-15s %pi6 %5d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 state->dev->ifindex, state->dev->name,
Harvey Harrisonb0711952008-10-28 16:05:40 -0700511 &im->aca_addr, im->aca_users);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 return 0;
513}
514
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700515static const struct seq_operations ac6_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 .start = ac6_seq_start,
517 .next = ac6_seq_next,
518 .stop = ac6_seq_stop,
519 .show = ac6_seq_show,
520};
521
522static int ac6_seq_open(struct inode *inode, struct file *file)
523{
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700524 return seq_open_net(inode, file, &ac6_seq_ops,
525 sizeof(struct ac6_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526}
527
Arjan van de Ven9a321442007-02-12 00:55:35 -0800528static const struct file_operations ac6_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 .owner = THIS_MODULE,
530 .open = ac6_seq_open,
531 .read = seq_read,
532 .llseek = seq_lseek,
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700533 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534};
535
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000536int __net_init ac6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537{
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700538 if (!proc_net_fops_create(net, "anycast6", S_IRUGO, &ac6_seq_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 return -ENOMEM;
540
541 return 0;
542}
543
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700544void ac6_proc_exit(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545{
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700546 proc_net_remove(net, "anycast6");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547}
548#endif
549