blob: 893261230ffc0a0a3e0e207db4ba9c7c8b3ef1f2 [file] [log] [blame]
Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * Anycast support for IPv6
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09004 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * Authors:
7 * David L Stevens (dlstevens@us.ibm.com)
8 *
9 * based heavily on net/ipv6/mcast.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
Randy Dunlap4fc268d2006-01-11 12:17:47 -080012#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020030#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#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
Jeff Barnhill2384d022018-11-02 20:23:57 +000043#define IN6_ADDR_HSIZE_SHIFT 8
44#define IN6_ADDR_HSIZE BIT(IN6_ADDR_HSIZE_SHIFT)
45/* anycast address hash table
46 */
47static struct hlist_head inet6_acaddr_lst[IN6_ADDR_HSIZE];
48static DEFINE_SPINLOCK(acaddr_hash_lock);
49
Eric Dumazetb71d1d42011-04-22 04:53:02 +000050static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Jeff Barnhill2384d022018-11-02 20:23:57 +000052static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070059/*
60 * socket join an anycast group
61 */
62
Eric Dumazetb71d1d42011-04-22 04:53:02 +000063int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
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;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -070069 struct net *net = sock_net(sk);
YOSHIFUJI Hideaki53b79972008-07-19 22:35:03 -070070 int ishost = !net->ipv6.devconf_all->forwarding;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 int err = 0;
72
Marcelo Ricardo Leitnerc4a68532015-03-20 11:37:17 -030073 ASSERT_RTNL();
74
Eric W. Biedermanaf31f412012-11-16 03:03:06 +000075 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 return -EPERM;
77 if (ipv6_addr_is_multicast(addr))
78 return -EINVAL;
David Ahern232378e2018-03-13 08:29:37 -070079
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))
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 return -EINVAL;
85
86 pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +010087 if (!pac)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return -ENOMEM;
89 pac->acl_next = NULL;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +000090 pac->acl_addr = *addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92 if (ifindex == 0) {
93 struct rt6_info *rt;
94
David Ahernb75cc8f2018-03-02 08:32:17 -080095 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 if (rt) {
David S. Millerd1918542011-12-28 20:19:20 -050097 dev = rt->dst.dev;
Amerigo Wang94e187c2012-10-29 00:13:19 +000098 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 } else if (ishost) {
100 err = -EADDRNOTAVAIL;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000101 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 } else {
103 /* router, no matching interface: just pick one */
WANG Cong6c555492014-09-11 15:35:09 -0700104 dev = __dev_get_by_flags(net, IFF_UP,
105 IFF_UP | IFF_LOOPBACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 }
David Ahern232378e2018-03-13 08:29:37 -0700107 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Ian Morris63159f22015-03-29 14:00:04 +0100109 if (!dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 err = -ENODEV;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000111 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 }
113
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000114 idev = __in6_dev_get(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 if (!idev) {
116 if (ifindex)
117 err = -ENODEV;
118 else
119 err = -EADDRNOTAVAIL;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000120 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
122 /* reset ishost, now that we have a specific device */
123 ishost = !idev->cnf.forwarding;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
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 */
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400132 if (!ipv6_chk_prefix(addr, dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 if (ishost)
134 err = -EADDRNOTAVAIL;
135 if (err)
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000136 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 }
138
WANG Cong013b4d92014-09-11 15:35:11 -0700139 err = __ipv6_dev_ac_inc(idev, addr);
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000140 if (!err) {
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000141 pac->acl_next = np->ipv6_ac_list;
142 np->ipv6_ac_list = pac;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000143 pac = NULL;
144 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000146error:
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000147 if (pac)
148 sock_kfree_s(sk, pac, sizeof(*pac));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 return err;
150}
151
152/*
153 * socket leave an anycast group
154 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000155int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
157 struct ipv6_pinfo *np = inet6_sk(sk);
158 struct net_device *dev;
159 struct ipv6_ac_socklist *pac, *prev_pac;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700160 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Marcelo Ricardo Leitnerc4a68532015-03-20 11:37:17 -0300162 ASSERT_RTNL();
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 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 }
Marcelo Ricardo Leitnerc4a68532015-03-20 11:37:17 -0300171 if (!pac)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (prev_pac)
174 prev_pac->acl_next = pac->acl_next;
175 else
176 np->ipv6_ac_list = pac->acl_next;
177
WANG Cong6c555492014-09-11 15:35:09 -0700178 dev = __dev_get_by_index(net, pac->acl_ifindex);
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000179 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 ipv6_dev_ac_dec(dev, &pac->acl_addr);
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 sock_kfree_s(sk, pac, sizeof(*pac));
183 return 0;
184}
185
186void 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;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700191 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 int prev_index;
193
Eric Dumazet0e1efe92012-12-05 09:18:10 +0000194 if (!np->ipv6_ac_list)
195 return;
196
WANG Congb03a9c02014-09-11 15:35:10 -0700197 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 pac = np->ipv6_ac_list;
199 np->ipv6_ac_list = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
201 prev_index = 0;
202 while (pac) {
203 struct ipv6_ac_socklist *next = pac->acl_next;
204
205 if (pac->acl_ifindex != prev_index) {
WANG Cong6c555492014-09-11 15:35:09 -0700206 dev = __dev_get_by_index(net, pac->acl_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 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 }
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +0200214 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
Jeff Barnhill2384d022018-11-02 20:23:57 +0000217static 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
226static 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
WANG Cong83aa29e2014-09-11 15:35:12 -0700233static void aca_get(struct ifacaddr6 *aca)
234{
Reshetova, Elenaaffa78b2017-07-04 09:34:58 +0300235 refcount_inc(&aca->aca_refcnt);
WANG Cong83aa29e2014-09-11 15:35:12 -0700236}
237
Jeff Barnhill2384d022018-11-02 20:23:57 +0000238static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246static void aca_put(struct ifacaddr6 *ac)
247{
Reshetova, Elenaaffa78b2017-07-04 09:34:58 +0300248 if (refcount_dec_and_test(&ac->aca_refcnt)) {
Jeff Barnhill2384d022018-11-02 20:23:57 +0000249 call_rcu(&ac->rcu, aca_free_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 }
251}
252
David Ahern93c2fb22018-04-18 15:38:59 -0700253static struct ifacaddr6 *aca_alloc(struct fib6_info *f6i,
WANG Cong83aa29e2014-09-11 15:35:12 -0700254 const struct in6_addr *addr)
255{
WANG Cong83aa29e2014-09-11 15:35:12 -0700256 struct ifacaddr6 *aca;
257
258 aca = kzalloc(sizeof(*aca), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +0100259 if (!aca)
WANG Cong83aa29e2014-09-11 15:35:12 -0700260 return NULL;
261
262 aca->aca_addr = *addr;
David Ahern93c2fb22018-04-18 15:38:59 -0700263 fib6_info_hold(f6i);
264 aca->aca_rt = f6i;
Jeff Barnhill2384d022018-11-02 20:23:57 +0000265 INIT_HLIST_NODE(&aca->aca_addr_lst);
WANG Cong83aa29e2014-09-11 15:35:12 -0700266 aca->aca_users = 1;
267 /* aca_tstamp should be updated upon changes */
268 aca->aca_cstamp = aca->aca_tstamp = jiffies;
Reshetova, Elenaaffa78b2017-07-04 09:34:58 +0300269 refcount_set(&aca->aca_refcnt, 1);
WANG Cong83aa29e2014-09-11 15:35:12 -0700270
271 return aca;
272}
273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274/*
275 * device anycast group inc (add if not found)
276 */
WANG Cong013b4d92014-09-11 15:35:11 -0700277int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
279 struct ifacaddr6 *aca;
David Ahern360a9882018-04-18 15:39:00 -0700280 struct fib6_info *f6i;
David Ahernafb1d4b52018-04-17 17:33:11 -0700281 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 int err;
283
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +0200284 ASSERT_RTNL();
285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 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
David Ahernafb1d4b52018-04-17 17:33:11 -0700300 net = dev_net(idev->dev);
David Ahern360a9882018-04-18 15:39:00 -0700301 f6i = addrconf_f6i_alloc(net, idev, addr, true, GFP_ATOMIC);
302 if (IS_ERR(f6i)) {
303 err = PTR_ERR(f6i);
WANG Cong83aa29e2014-09-11 15:35:12 -0700304 goto out;
305 }
David Ahern360a9882018-04-18 15:39:00 -0700306 aca = aca_alloc(f6i, addr);
Ian Morris63159f22015-03-29 14:00:04 +0100307 if (!aca) {
David Ahern360a9882018-04-18 15:39:00 -0700308 fib6_info_release(f6i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 err = -ENOMEM;
310 goto out;
311 }
312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 aca->aca_next = idev->ac_list;
314 idev->ac_list = aca;
WANG Cong83aa29e2014-09-11 15:35:12 -0700315
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 write_unlock_bh(&idev->lock);
321
Jeff Barnhill2384d022018-11-02 20:23:57 +0000322 ipv6_add_acaddr_hash(net, aca);
323
David Ahern360a9882018-04-18 15:39:00 -0700324 ip6_ins_rt(net, f6i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
WANG Cong013b4d92014-09-11 15:35:11 -0700326 addrconf_join_solict(idev->dev, &aca->aca_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 aca_put(aca);
329 return 0;
330out:
331 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return err;
333}
334
335/*
336 * device anycast group decrement
337 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000338int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339{
340 struct ifacaddr6 *aca, *prev_aca;
341
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +0200342 ASSERT_RTNL();
343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 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);
Jeff Barnhill2384d022018-11-02 20:23:57 +0000364 ipv6_del_acaddr_hash(aca);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 addrconf_leave_solict(idev, &aca->aca_addr);
366
Roopa Prabhu11dd74b2020-04-27 13:56:45 -0700367 ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369 aca_put(aca);
370 return 0;
371}
372
WANG Cong6c555492014-09-11 15:35:09 -0700373/* called with rtnl_lock() */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000374static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000376 struct inet6_dev *idev = __in6_dev_get(dev);
377
Ian Morris63159f22015-03-29 14:00:04 +0100378 if (!idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 return -ENODEV;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000380 return __ipv6_dev_ac_dec(idev, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900382
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +0200383void 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
Jeff Barnhill2384d022018-11-02 20:23:57 +0000392 ipv6_del_acaddr_hash(aca);
393
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +0200394 addrconf_leave_solict(idev, &aca->aca_addr);
395
Roopa Prabhu11dd74b2020-04-27 13:56:45 -0700396 ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false);
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +0200397
398 aca_put(aca);
399
400 write_lock_bh(&idev->lock);
401 }
402 write_unlock_bh(&idev->lock);
403}
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405/*
406 * check if the interface has this anycast address
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000407 * called with rcu_read_lock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 */
Eric Dumazeta50feda2012-05-18 18:57:34 +0000409static bool ipv6_chk_acast_dev(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
411 struct inet6_dev *idev;
412 struct ifacaddr6 *aca;
413
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000414 idev = __in6_dev_get(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 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);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700421 return aca != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 }
Eric Dumazeta50feda2012-05-18 18:57:34 +0000423 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424}
425
426/*
427 * check if given interface (or any, if dev==0) has this anycast address
428 */
Eric Dumazeta50feda2012-05-18 18:57:34 +0000429bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
430 const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431{
Jeff Barnhill2384d022018-11-02 20:23:57 +0000432 struct net_device *nh_dev;
433 struct ifacaddr6 *aca;
Eric Dumazeta50feda2012-05-18 18:57:34 +0000434 bool found = false;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700435
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800436 rcu_read_lock();
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000437 if (dev)
438 found = ipv6_chk_acast_dev(dev, addr);
Li RongQing1c51dc92018-11-08 14:58:07 +0800439 else {
440 unsigned int hash = inet6_acaddr_hash(net, addr);
441
Jeff Barnhill2384d022018-11-02 20:23:57 +0000442 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)) {
Eric Dumazeta50feda2012-05-18 18:57:34 +0000448 found = true;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000449 break;
450 }
Jeff Barnhill2384d022018-11-02 20:23:57 +0000451 }
Li RongQing1c51dc92018-11-08 14:58:07 +0800452 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800453 rcu_read_unlock();
Pavel Emelianov7562f872007-05-03 15:13:45 -0700454 return found;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455}
456
FX Le Bail7c90cc22014-01-22 07:42:37 +0100457/* check if this anycast address is link-local on given interface or
458 * is global
459 */
460bool 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}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469#ifdef CONFIG_PROC_FS
470struct ac6_iter_state {
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700471 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 struct net_device *dev;
473 struct inet6_dev *idev;
474};
475
476#define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private)
477
478static 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);
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700482 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
Pavel Emelianov7562f872007-05-03 15:13:45 -0700484 state->idev = NULL;
Eric Dumazetce81b762009-11-11 17:34:30 +0000485 for_each_netdev_rcu(net, state->dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 struct inet6_dev *idev;
Eric Dumazetce81b762009-11-11 17:34:30 +0000487 idev = __in6_dev_get(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 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
501static 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) {
Eric Dumazetce81b762009-11-11 17:34:30 +0000507 if (likely(state->idev != NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 read_unlock_bh(&state->idev->lock);
Eric Dumazetce81b762009-11-11 17:34:30 +0000509
510 state->dev = next_net_device_rcu(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 if (!state->dev) {
512 state->idev = NULL;
513 break;
514 }
Eric Dumazetce81b762009-11-11 17:34:30 +0000515 state->idev = __in6_dev_get(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 if (!state->idev)
517 continue;
518 read_lock_bh(&state->idev->lock);
519 im = state->idev->ac_list;
520 }
521 return im;
522}
523
524static 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
533static void *ac6_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazetce81b762009-11-11 17:34:30 +0000534 __acquires(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535{
Eric Dumazetce81b762009-11-11 17:34:30 +0000536 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 return ac6_get_idx(seq, *pos);
538}
539
540static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
541{
Eric Dumazetce81b762009-11-11 17:34:30 +0000542 struct ifacaddr6 *im = ac6_get_next(seq, v);
543
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 ++*pos;
545 return im;
546}
547
548static void ac6_seq_stop(struct seq_file *seq, void *v)
Eric Dumazetce81b762009-11-11 17:34:30 +0000549 __releases(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550{
551 struct ac6_iter_state *state = ac6_seq_private(seq);
Eric Dumazetce81b762009-11-11 17:34:30 +0000552
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 if (likely(state->idev != NULL)) {
554 read_unlock_bh(&state->idev->lock);
Eric Dumazetce81b762009-11-11 17:34:30 +0000555 state->idev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 }
Eric Dumazetce81b762009-11-11 17:34:30 +0000557 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558}
559
560static 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
Harvey Harrison4b7a4272008-10-29 12:50:24 -0700565 seq_printf(seq, "%-4d %-15s %pi6 %5d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 state->dev->ifindex, state->dev->name,
Harvey Harrisonb0711952008-10-28 16:05:40 -0700567 &im->aca_addr, im->aca_users);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 return 0;
569}
570
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700571static const struct seq_operations ac6_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 .start = ac6_seq_start,
573 .next = ac6_seq_next,
574 .stop = ac6_seq_stop,
575 .show = ac6_seq_show,
576};
577
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000578int __net_init ac6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579{
Christoph Hellwigc3506372018-04-10 19:42:55 +0200580 if (!proc_create_net("anycast6", 0444, net->proc_net, &ac6_seq_ops,
581 sizeof(struct ac6_iter_state)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 return -ENOMEM;
583
584 return 0;
585}
586
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700587void ac6_proc_exit(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588{
Gao fengece31ff2013-02-18 01:34:56 +0000589 remove_proc_entry("anycast6", net->proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590}
Jeff Barnhill6915ed82018-11-05 20:36:45 +0000591#endif
Jeff Barnhill2384d022018-11-02 20:23:57 +0000592
593/* Init / cleanup code
594 */
595int __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
604void 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}