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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Anycast support for IPv6 | |
1ab1457c | 4 | * Linux INET6 implementation |
1da177e4 LT |
5 | * |
6 | * Authors: | |
7 | * David L Stevens (dlstevens@us.ibm.com) | |
8 | * | |
9 | * based heavily on net/ipv6/mcast.c | |
1da177e4 LT |
10 | */ |
11 | ||
4fc268d2 | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/random.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/socket.h> | |
19 | #include <linux/sockios.h> | |
1da177e4 LT |
20 | #include <linux/net.h> |
21 | #include <linux/in6.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/if_arp.h> | |
24 | #include <linux/route.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/proc_fs.h> | |
27 | #include <linux/seq_file.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
1da177e4 | 29 | |
457c4cbc | 30 | #include <net/net_namespace.h> |
1da177e4 LT |
31 | #include <net/sock.h> |
32 | #include <net/snmp.h> | |
33 | ||
34 | #include <net/ipv6.h> | |
35 | #include <net/protocol.h> | |
36 | #include <net/if_inet6.h> | |
37 | #include <net/ndisc.h> | |
38 | #include <net/addrconf.h> | |
39 | #include <net/ip6_route.h> | |
40 | ||
41 | #include <net/checksum.h> | |
42 | ||
2384d025 JB |
43 | #define IN6_ADDR_HSIZE_SHIFT 8 |
44 | #define IN6_ADDR_HSIZE BIT(IN6_ADDR_HSIZE_SHIFT) | |
45 | /* anycast address hash table | |
46 | */ | |
47 | static struct hlist_head inet6_acaddr_lst[IN6_ADDR_HSIZE]; | |
48 | static DEFINE_SPINLOCK(acaddr_hash_lock); | |
49 | ||
b71d1d42 | 50 | static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr); |
1da177e4 | 51 | |
2384d025 JB |
52 | static u32 inet6_acaddr_hash(struct net *net, const struct in6_addr *addr) |
53 | { | |
54 | u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); | |
55 | ||
56 | return hash_32(val, IN6_ADDR_HSIZE_SHIFT); | |
57 | } | |
58 | ||
1da177e4 LT |
59 | /* |
60 | * socket join an anycast group | |
61 | */ | |
62 | ||
b71d1d42 | 63 | int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr) |
1da177e4 LT |
64 | { |
65 | struct ipv6_pinfo *np = inet6_sk(sk); | |
66 | struct net_device *dev = NULL; | |
67 | struct inet6_dev *idev; | |
68 | struct ipv6_ac_socklist *pac; | |
6ab57e7e | 69 | struct net *net = sock_net(sk); |
53b7997f | 70 | int ishost = !net->ipv6.devconf_all->forwarding; |
1da177e4 LT |
71 | int err = 0; |
72 | ||
c4a6853d MRL |
73 | ASSERT_RTNL(); |
74 | ||
af31f412 | 75 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
76 | return -EPERM; |
77 | if (ipv6_addr_is_multicast(addr)) | |
78 | return -EINVAL; | |
232378e8 DA |
79 | |
80 | if (ifindex) | |
81 | dev = __dev_get_by_index(net, ifindex); | |
82 | ||
83 | if (ipv6_chk_addr_and_flags(net, addr, dev, true, 0, IFA_F_TENTATIVE)) | |
1da177e4 LT |
84 | return -EINVAL; |
85 | ||
86 | pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL); | |
63159f29 | 87 | if (!pac) |
1da177e4 LT |
88 | return -ENOMEM; |
89 | pac->acl_next = NULL; | |
4e3fd7a0 | 90 | pac->acl_addr = *addr; |
1da177e4 LT |
91 | |
92 | if (ifindex == 0) { | |
93 | struct rt6_info *rt; | |
94 | ||
b75cc8f9 | 95 | rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); |
1da177e4 | 96 | if (rt) { |
d1918542 | 97 | dev = rt->dst.dev; |
94e187c0 | 98 | ip6_rt_put(rt); |
1da177e4 LT |
99 | } else if (ishost) { |
100 | err = -EADDRNOTAVAIL; | |
bb69ae04 | 101 | goto error; |
1da177e4 LT |
102 | } else { |
103 | /* router, no matching interface: just pick one */ | |
6c555490 WC |
104 | dev = __dev_get_by_flags(net, IFF_UP, |
105 | IFF_UP | IFF_LOOPBACK); | |
1da177e4 | 106 | } |
232378e8 | 107 | } |
1da177e4 | 108 | |
63159f29 | 109 | if (!dev) { |
1da177e4 | 110 | err = -ENODEV; |
bb69ae04 | 111 | goto error; |
1da177e4 LT |
112 | } |
113 | ||
bb69ae04 | 114 | idev = __in6_dev_get(dev); |
1da177e4 LT |
115 | if (!idev) { |
116 | if (ifindex) | |
117 | err = -ENODEV; | |
118 | else | |
119 | err = -EADDRNOTAVAIL; | |
bb69ae04 | 120 | goto error; |
1da177e4 LT |
121 | } |
122 | /* reset ishost, now that we have a specific device */ | |
123 | ishost = !idev->cnf.forwarding; | |
1da177e4 LT |
124 | |
125 | pac->acl_ifindex = dev->ifindex; | |
126 | ||
127 | /* XXX | |
128 | * For hosts, allow link-local or matching prefix anycasts. | |
129 | * This obviates the need for propagating anycast routes while | |
130 | * still allowing some non-router anycast participation. | |
131 | */ | |
52eeeb84 | 132 | if (!ipv6_chk_prefix(addr, dev)) { |
1da177e4 LT |
133 | if (ishost) |
134 | err = -EADDRNOTAVAIL; | |
135 | if (err) | |
bb69ae04 | 136 | goto error; |
1da177e4 LT |
137 | } |
138 | ||
013b4d90 | 139 | err = __ipv6_dev_ac_inc(idev, addr); |
bb69ae04 | 140 | if (!err) { |
bb69ae04 ED |
141 | pac->acl_next = np->ipv6_ac_list; |
142 | np->ipv6_ac_list = pac; | |
bb69ae04 ED |
143 | pac = NULL; |
144 | } | |
1da177e4 | 145 | |
bb69ae04 | 146 | error: |
bb69ae04 ED |
147 | if (pac) |
148 | sock_kfree_s(sk, pac, sizeof(*pac)); | |
1da177e4 LT |
149 | return err; |
150 | } | |
151 | ||
152 | /* | |
153 | * socket leave an anycast group | |
154 | */ | |
b71d1d42 | 155 | int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) |
1da177e4 LT |
156 | { |
157 | struct ipv6_pinfo *np = inet6_sk(sk); | |
158 | struct net_device *dev; | |
159 | struct ipv6_ac_socklist *pac, *prev_pac; | |
6ab57e7e | 160 | struct net *net = sock_net(sk); |
1da177e4 | 161 | |
c4a6853d MRL |
162 | ASSERT_RTNL(); |
163 | ||
1da177e4 LT |
164 | prev_pac = NULL; |
165 | for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) { | |
166 | if ((ifindex == 0 || pac->acl_ifindex == ifindex) && | |
167 | ipv6_addr_equal(&pac->acl_addr, addr)) | |
168 | break; | |
169 | prev_pac = pac; | |
170 | } | |
c4a6853d | 171 | if (!pac) |
1da177e4 | 172 | return -ENOENT; |
1da177e4 LT |
173 | if (prev_pac) |
174 | prev_pac->acl_next = pac->acl_next; | |
175 | else | |
176 | np->ipv6_ac_list = pac->acl_next; | |
177 | ||
6c555490 | 178 | dev = __dev_get_by_index(net, pac->acl_ifindex); |
bb69ae04 | 179 | if (dev) |
1da177e4 | 180 | ipv6_dev_ac_dec(dev, &pac->acl_addr); |
bb69ae04 | 181 | |
1da177e4 LT |
182 | sock_kfree_s(sk, pac, sizeof(*pac)); |
183 | return 0; | |
184 | } | |
185 | ||
186 | void ipv6_sock_ac_close(struct sock *sk) | |
187 | { | |
188 | struct ipv6_pinfo *np = inet6_sk(sk); | |
189 | struct net_device *dev = NULL; | |
190 | struct ipv6_ac_socklist *pac; | |
6ab57e7e | 191 | struct net *net = sock_net(sk); |
1da177e4 LT |
192 | int prev_index; |
193 | ||
0e1efe9d ED |
194 | if (!np->ipv6_ac_list) |
195 | return; | |
196 | ||
b03a9c04 | 197 | rtnl_lock(); |
1da177e4 LT |
198 | pac = np->ipv6_ac_list; |
199 | np->ipv6_ac_list = NULL; | |
1da177e4 LT |
200 | |
201 | prev_index = 0; | |
202 | while (pac) { | |
203 | struct ipv6_ac_socklist *next = pac->acl_next; | |
204 | ||
205 | if (pac->acl_ifindex != prev_index) { | |
6c555490 | 206 | dev = __dev_get_by_index(net, pac->acl_ifindex); |
1da177e4 LT |
207 | prev_index = pac->acl_ifindex; |
208 | } | |
209 | if (dev) | |
210 | ipv6_dev_ac_dec(dev, &pac->acl_addr); | |
211 | sock_kfree_s(sk, pac, sizeof(*pac)); | |
212 | pac = next; | |
213 | } | |
a9ed4a29 | 214 | rtnl_unlock(); |
1da177e4 LT |
215 | } |
216 | ||
2384d025 JB |
217 | static void ipv6_add_acaddr_hash(struct net *net, struct ifacaddr6 *aca) |
218 | { | |
219 | unsigned int hash = inet6_acaddr_hash(net, &aca->aca_addr); | |
220 | ||
221 | spin_lock(&acaddr_hash_lock); | |
222 | hlist_add_head_rcu(&aca->aca_addr_lst, &inet6_acaddr_lst[hash]); | |
223 | spin_unlock(&acaddr_hash_lock); | |
224 | } | |
225 | ||
226 | static void ipv6_del_acaddr_hash(struct ifacaddr6 *aca) | |
227 | { | |
228 | spin_lock(&acaddr_hash_lock); | |
229 | hlist_del_init_rcu(&aca->aca_addr_lst); | |
230 | spin_unlock(&acaddr_hash_lock); | |
231 | } | |
232 | ||
83aa29ee WC |
233 | static void aca_get(struct ifacaddr6 *aca) |
234 | { | |
affa78bc | 235 | refcount_inc(&aca->aca_refcnt); |
83aa29ee WC |
236 | } |
237 | ||
2384d025 JB |
238 | static void aca_free_rcu(struct rcu_head *h) |
239 | { | |
240 | struct ifacaddr6 *aca = container_of(h, struct ifacaddr6, rcu); | |
241 | ||
242 | fib6_info_release(aca->aca_rt); | |
243 | kfree(aca); | |
244 | } | |
245 | ||
1da177e4 LT |
246 | static void aca_put(struct ifacaddr6 *ac) |
247 | { | |
affa78bc | 248 | if (refcount_dec_and_test(&ac->aca_refcnt)) { |
2384d025 | 249 | call_rcu(&ac->rcu, aca_free_rcu); |
1da177e4 LT |
250 | } |
251 | } | |
252 | ||
93c2fb25 | 253 | static struct ifacaddr6 *aca_alloc(struct fib6_info *f6i, |
83aa29ee WC |
254 | const struct in6_addr *addr) |
255 | { | |
83aa29ee WC |
256 | struct ifacaddr6 *aca; |
257 | ||
258 | aca = kzalloc(sizeof(*aca), GFP_ATOMIC); | |
63159f29 | 259 | if (!aca) |
83aa29ee WC |
260 | return NULL; |
261 | ||
262 | aca->aca_addr = *addr; | |
93c2fb25 DA |
263 | fib6_info_hold(f6i); |
264 | aca->aca_rt = f6i; | |
2384d025 | 265 | INIT_HLIST_NODE(&aca->aca_addr_lst); |
83aa29ee WC |
266 | aca->aca_users = 1; |
267 | /* aca_tstamp should be updated upon changes */ | |
268 | aca->aca_cstamp = aca->aca_tstamp = jiffies; | |
affa78bc | 269 | refcount_set(&aca->aca_refcnt, 1); |
83aa29ee WC |
270 | |
271 | return aca; | |
272 | } | |
273 | ||
1da177e4 LT |
274 | /* |
275 | * device anycast group inc (add if not found) | |
276 | */ | |
013b4d90 | 277 | int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr) |
1da177e4 LT |
278 | { |
279 | struct ifacaddr6 *aca; | |
360a9887 | 280 | struct fib6_info *f6i; |
afb1d4b5 | 281 | struct net *net; |
1da177e4 LT |
282 | int err; |
283 | ||
a9ed4a29 SD |
284 | ASSERT_RTNL(); |
285 | ||
1da177e4 LT |
286 | write_lock_bh(&idev->lock); |
287 | if (idev->dead) { | |
288 | err = -ENODEV; | |
289 | goto out; | |
290 | } | |
291 | ||
292 | for (aca = idev->ac_list; aca; aca = aca->aca_next) { | |
293 | if (ipv6_addr_equal(&aca->aca_addr, addr)) { | |
294 | aca->aca_users++; | |
295 | err = 0; | |
296 | goto out; | |
297 | } | |
298 | } | |
299 | ||
afb1d4b5 | 300 | net = dev_net(idev->dev); |
360a9887 DA |
301 | f6i = addrconf_f6i_alloc(net, idev, addr, true, GFP_ATOMIC); |
302 | if (IS_ERR(f6i)) { | |
303 | err = PTR_ERR(f6i); | |
1da177e4 LT |
304 | goto out; |
305 | } | |
360a9887 | 306 | aca = aca_alloc(f6i, addr); |
63159f29 | 307 | if (!aca) { |
360a9887 | 308 | fib6_info_release(f6i); |
83aa29ee WC |
309 | err = -ENOMEM; |
310 | goto out; | |
311 | } | |
1da177e4 LT |
312 | |
313 | aca->aca_next = idev->ac_list; | |
314 | idev->ac_list = aca; | |
83aa29ee WC |
315 | |
316 | /* Hold this for addrconf_join_solict() below before we unlock, | |
317 | * it is already exposed via idev->ac_list. | |
318 | */ | |
319 | aca_get(aca); | |
1da177e4 LT |
320 | write_unlock_bh(&idev->lock); |
321 | ||
2384d025 JB |
322 | ipv6_add_acaddr_hash(net, aca); |
323 | ||
360a9887 | 324 | ip6_ins_rt(net, f6i); |
1da177e4 | 325 | |
013b4d90 | 326 | addrconf_join_solict(idev->dev, &aca->aca_addr); |
1da177e4 LT |
327 | |
328 | aca_put(aca); | |
329 | return 0; | |
330 | out: | |
331 | write_unlock_bh(&idev->lock); | |
1da177e4 LT |
332 | return err; |
333 | } | |
334 | ||
335 | /* | |
336 | * device anycast group decrement | |
337 | */ | |
b71d1d42 | 338 | int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr) |
1da177e4 LT |
339 | { |
340 | struct ifacaddr6 *aca, *prev_aca; | |
341 | ||
a9ed4a29 SD |
342 | ASSERT_RTNL(); |
343 | ||
1da177e4 LT |
344 | write_lock_bh(&idev->lock); |
345 | prev_aca = NULL; | |
346 | for (aca = idev->ac_list; aca; aca = aca->aca_next) { | |
347 | if (ipv6_addr_equal(&aca->aca_addr, addr)) | |
348 | break; | |
349 | prev_aca = aca; | |
350 | } | |
351 | if (!aca) { | |
352 | write_unlock_bh(&idev->lock); | |
353 | return -ENOENT; | |
354 | } | |
355 | if (--aca->aca_users > 0) { | |
356 | write_unlock_bh(&idev->lock); | |
357 | return 0; | |
358 | } | |
359 | if (prev_aca) | |
360 | prev_aca->aca_next = aca->aca_next; | |
361 | else | |
362 | idev->ac_list = aca->aca_next; | |
363 | write_unlock_bh(&idev->lock); | |
2384d025 | 364 | ipv6_del_acaddr_hash(aca); |
1da177e4 LT |
365 | addrconf_leave_solict(idev, &aca->aca_addr); |
366 | ||
afb1d4b5 | 367 | ip6_del_rt(dev_net(idev->dev), aca->aca_rt); |
1da177e4 LT |
368 | |
369 | aca_put(aca); | |
370 | return 0; | |
371 | } | |
372 | ||
6c555490 | 373 | /* called with rtnl_lock() */ |
b71d1d42 | 374 | static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr) |
1da177e4 | 375 | { |
bb69ae04 ED |
376 | struct inet6_dev *idev = __in6_dev_get(dev); |
377 | ||
63159f29 | 378 | if (!idev) |
1da177e4 | 379 | return -ENODEV; |
bb69ae04 | 380 | return __ipv6_dev_ac_dec(idev, addr); |
1da177e4 | 381 | } |
1ab1457c | 382 | |
381f4dca SD |
383 | void ipv6_ac_destroy_dev(struct inet6_dev *idev) |
384 | { | |
385 | struct ifacaddr6 *aca; | |
386 | ||
387 | write_lock_bh(&idev->lock); | |
388 | while ((aca = idev->ac_list) != NULL) { | |
389 | idev->ac_list = aca->aca_next; | |
390 | write_unlock_bh(&idev->lock); | |
391 | ||
2384d025 JB |
392 | ipv6_del_acaddr_hash(aca); |
393 | ||
381f4dca SD |
394 | addrconf_leave_solict(idev, &aca->aca_addr); |
395 | ||
afb1d4b5 | 396 | ip6_del_rt(dev_net(idev->dev), aca->aca_rt); |
381f4dca SD |
397 | |
398 | aca_put(aca); | |
399 | ||
400 | write_lock_bh(&idev->lock); | |
401 | } | |
402 | write_unlock_bh(&idev->lock); | |
403 | } | |
404 | ||
1da177e4 LT |
405 | /* |
406 | * check if the interface has this anycast address | |
bb69ae04 | 407 | * called with rcu_read_lock() |
1da177e4 | 408 | */ |
a50feda5 | 409 | static bool ipv6_chk_acast_dev(struct net_device *dev, const struct in6_addr *addr) |
1da177e4 LT |
410 | { |
411 | struct inet6_dev *idev; | |
412 | struct ifacaddr6 *aca; | |
413 | ||
bb69ae04 | 414 | idev = __in6_dev_get(dev); |
1da177e4 LT |
415 | if (idev) { |
416 | read_lock_bh(&idev->lock); | |
417 | for (aca = idev->ac_list; aca; aca = aca->aca_next) | |
418 | if (ipv6_addr_equal(&aca->aca_addr, addr)) | |
419 | break; | |
420 | read_unlock_bh(&idev->lock); | |
cfcabdcc | 421 | return aca != NULL; |
1da177e4 | 422 | } |
a50feda5 | 423 | return false; |
1da177e4 LT |
424 | } |
425 | ||
426 | /* | |
427 | * check if given interface (or any, if dev==0) has this anycast address | |
428 | */ | |
a50feda5 ED |
429 | bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, |
430 | const struct in6_addr *addr) | |
1da177e4 | 431 | { |
2384d025 JB |
432 | struct net_device *nh_dev; |
433 | struct ifacaddr6 *aca; | |
a50feda5 | 434 | bool found = false; |
7562f876 | 435 | |
c6d14c84 | 436 | rcu_read_lock(); |
bb69ae04 ED |
437 | if (dev) |
438 | found = ipv6_chk_acast_dev(dev, addr); | |
1c51dc9a LR |
439 | else { |
440 | unsigned int hash = inet6_acaddr_hash(net, addr); | |
441 | ||
2384d025 JB |
442 | hlist_for_each_entry_rcu(aca, &inet6_acaddr_lst[hash], |
443 | aca_addr_lst) { | |
444 | nh_dev = fib6_info_nh_dev(aca->aca_rt); | |
445 | if (!nh_dev || !net_eq(dev_net(nh_dev), net)) | |
446 | continue; | |
447 | if (ipv6_addr_equal(&aca->aca_addr, addr)) { | |
a50feda5 | 448 | found = true; |
bb69ae04 ED |
449 | break; |
450 | } | |
2384d025 | 451 | } |
1c51dc9a | 452 | } |
c6d14c84 | 453 | rcu_read_unlock(); |
7562f876 | 454 | return found; |
1da177e4 LT |
455 | } |
456 | ||
7c90cc2d FLB |
457 | /* check if this anycast address is link-local on given interface or |
458 | * is global | |
459 | */ | |
460 | bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, | |
461 | const struct in6_addr *addr) | |
462 | { | |
463 | return ipv6_chk_acast_addr(net, | |
464 | (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL ? | |
465 | dev : NULL), | |
466 | addr); | |
467 | } | |
1da177e4 LT |
468 | |
469 | #ifdef CONFIG_PROC_FS | |
470 | struct ac6_iter_state { | |
6ab57e7e | 471 | struct seq_net_private p; |
1da177e4 LT |
472 | struct net_device *dev; |
473 | struct inet6_dev *idev; | |
474 | }; | |
475 | ||
476 | #define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private) | |
477 | ||
478 | static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq) | |
479 | { | |
480 | struct ifacaddr6 *im = NULL; | |
481 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
6ab57e7e | 482 | struct net *net = seq_file_net(seq); |
1da177e4 | 483 | |
7562f876 | 484 | state->idev = NULL; |
ce81b76a | 485 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 486 | struct inet6_dev *idev; |
ce81b76a | 487 | idev = __in6_dev_get(state->dev); |
1da177e4 LT |
488 | if (!idev) |
489 | continue; | |
490 | read_lock_bh(&idev->lock); | |
491 | im = idev->ac_list; | |
492 | if (im) { | |
493 | state->idev = idev; | |
494 | break; | |
495 | } | |
496 | read_unlock_bh(&idev->lock); | |
497 | } | |
498 | return im; | |
499 | } | |
500 | ||
501 | static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im) | |
502 | { | |
503 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
504 | ||
505 | im = im->aca_next; | |
506 | while (!im) { | |
ce81b76a | 507 | if (likely(state->idev != NULL)) |
1da177e4 | 508 | read_unlock_bh(&state->idev->lock); |
ce81b76a ED |
509 | |
510 | state->dev = next_net_device_rcu(state->dev); | |
1da177e4 LT |
511 | if (!state->dev) { |
512 | state->idev = NULL; | |
513 | break; | |
514 | } | |
ce81b76a | 515 | state->idev = __in6_dev_get(state->dev); |
1da177e4 LT |
516 | if (!state->idev) |
517 | continue; | |
518 | read_lock_bh(&state->idev->lock); | |
519 | im = state->idev->ac_list; | |
520 | } | |
521 | return im; | |
522 | } | |
523 | ||
524 | static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos) | |
525 | { | |
526 | struct ifacaddr6 *im = ac6_get_first(seq); | |
527 | if (im) | |
528 | while (pos && (im = ac6_get_next(seq, im)) != NULL) | |
529 | --pos; | |
530 | return pos ? NULL : im; | |
531 | } | |
532 | ||
533 | static void *ac6_seq_start(struct seq_file *seq, loff_t *pos) | |
ce81b76a | 534 | __acquires(RCU) |
1da177e4 | 535 | { |
ce81b76a | 536 | rcu_read_lock(); |
1da177e4 LT |
537 | return ac6_get_idx(seq, *pos); |
538 | } | |
539 | ||
540 | static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
541 | { | |
ce81b76a ED |
542 | struct ifacaddr6 *im = ac6_get_next(seq, v); |
543 | ||
1da177e4 LT |
544 | ++*pos; |
545 | return im; | |
546 | } | |
547 | ||
548 | static void ac6_seq_stop(struct seq_file *seq, void *v) | |
ce81b76a | 549 | __releases(RCU) |
1da177e4 LT |
550 | { |
551 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
ce81b76a | 552 | |
1da177e4 LT |
553 | if (likely(state->idev != NULL)) { |
554 | read_unlock_bh(&state->idev->lock); | |
ce81b76a | 555 | state->idev = NULL; |
1da177e4 | 556 | } |
ce81b76a | 557 | rcu_read_unlock(); |
1da177e4 LT |
558 | } |
559 | ||
560 | static int ac6_seq_show(struct seq_file *seq, void *v) | |
561 | { | |
562 | struct ifacaddr6 *im = (struct ifacaddr6 *)v; | |
563 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
564 | ||
4b7a4274 | 565 | seq_printf(seq, "%-4d %-15s %pi6 %5d\n", |
1da177e4 | 566 | state->dev->ifindex, state->dev->name, |
b071195d | 567 | &im->aca_addr, im->aca_users); |
1da177e4 LT |
568 | return 0; |
569 | } | |
570 | ||
56b3d975 | 571 | static const struct seq_operations ac6_seq_ops = { |
1da177e4 LT |
572 | .start = ac6_seq_start, |
573 | .next = ac6_seq_next, | |
574 | .stop = ac6_seq_stop, | |
575 | .show = ac6_seq_show, | |
576 | }; | |
577 | ||
2c8c1e72 | 578 | int __net_init ac6_proc_init(struct net *net) |
1da177e4 | 579 | { |
c3506372 CH |
580 | if (!proc_create_net("anycast6", 0444, net->proc_net, &ac6_seq_ops, |
581 | sizeof(struct ac6_iter_state))) | |
1da177e4 LT |
582 | return -ENOMEM; |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
6ab57e7e | 587 | void ac6_proc_exit(struct net *net) |
1da177e4 | 588 | { |
ece31ffd | 589 | remove_proc_entry("anycast6", net->proc_net); |
1da177e4 | 590 | } |
6915ed86 | 591 | #endif |
2384d025 JB |
592 | |
593 | /* Init / cleanup code | |
594 | */ | |
595 | int __init ipv6_anycast_init(void) | |
596 | { | |
597 | int i; | |
598 | ||
599 | for (i = 0; i < IN6_ADDR_HSIZE; i++) | |
600 | INIT_HLIST_HEAD(&inet6_acaddr_lst[i]); | |
601 | return 0; | |
602 | } | |
603 | ||
604 | void ipv6_anycast_cleanup(void) | |
605 | { | |
606 | int i; | |
607 | ||
608 | spin_lock(&acaddr_hash_lock); | |
609 | for (i = 0; i < IN6_ADDR_HSIZE; i++) | |
610 | WARN_ON(!hlist_empty(&inet6_acaddr_lst[i])); | |
611 | spin_unlock(&acaddr_hash_lock); | |
612 | } |