e1000: Add device IDs of blade version of the 82571 quad port
[pv_ops_mirror.git] / net / ipv6 / anycast.c
blobb8c533fbdb63f0ab320b7d27735f2e5a6ea2b040
1 /*
2 * Anycast support for IPv6
3 * Linux INET6 implementation
5 * Authors:
6 * David L Stevens (dlstevens@us.ibm.com)
8 * based heavily on net/ipv6/mcast.c
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.
16 #include <linux/capability.h>
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>
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>
33 #include <net/sock.h>
34 #include <net/snmp.h>
36 #include <net/ipv6.h>
37 #include <net/protocol.h>
38 #include <net/if_inet6.h>
39 #include <net/ndisc.h>
40 #include <net/addrconf.h>
41 #include <net/ip6_route.h>
43 #include <net/checksum.h>
45 static int ipv6_dev_ac_dec(struct net_device *dev, struct in6_addr *addr);
47 /* Big ac list lock for all the sockets */
48 static DEFINE_RWLOCK(ipv6_sk_ac_lock);
50 static int
51 ip6_onlink(struct in6_addr *addr, struct net_device *dev)
53 struct inet6_dev *idev;
54 struct inet6_ifaddr *ifa;
55 int onlink;
57 onlink = 0;
58 rcu_read_lock();
59 idev = __in6_dev_get(dev);
60 if (idev) {
61 read_lock_bh(&idev->lock);
62 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
63 onlink = ipv6_prefix_equal(addr, &ifa->addr,
64 ifa->prefix_len);
65 if (onlink)
66 break;
68 read_unlock_bh(&idev->lock);
70 rcu_read_unlock();
71 return onlink;
75 * socket join an anycast group
78 int ipv6_sock_ac_join(struct sock *sk, int ifindex, struct in6_addr *addr)
80 struct ipv6_pinfo *np = inet6_sk(sk);
81 struct net_device *dev = NULL;
82 struct inet6_dev *idev;
83 struct ipv6_ac_socklist *pac;
84 int ishost = !ipv6_devconf.forwarding;
85 int err = 0;
87 if (!capable(CAP_NET_ADMIN))
88 return -EPERM;
89 if (ipv6_addr_is_multicast(addr))
90 return -EINVAL;
91 if (ipv6_chk_addr(addr, NULL, 0))
92 return -EINVAL;
94 pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL);
95 if (pac == NULL)
96 return -ENOMEM;
97 pac->acl_next = NULL;
98 ipv6_addr_copy(&pac->acl_addr, addr);
100 if (ifindex == 0) {
101 struct rt6_info *rt;
103 rt = rt6_lookup(addr, NULL, 0, 0);
104 if (rt) {
105 dev = rt->rt6i_dev;
106 dev_hold(dev);
107 dst_release(&rt->u.dst);
108 } else if (ishost) {
109 err = -EADDRNOTAVAIL;
110 goto out_free_pac;
111 } else {
112 /* router, no matching interface: just pick one */
114 dev = dev_get_by_flags(IFF_UP, IFF_UP|IFF_LOOPBACK);
116 } else
117 dev = dev_get_by_index(ifindex);
119 if (dev == NULL) {
120 err = -ENODEV;
121 goto out_free_pac;
124 idev = in6_dev_get(dev);
125 if (!idev) {
126 if (ifindex)
127 err = -ENODEV;
128 else
129 err = -EADDRNOTAVAIL;
130 goto out_dev_put;
132 /* reset ishost, now that we have a specific device */
133 ishost = !idev->cnf.forwarding;
134 in6_dev_put(idev);
136 pac->acl_ifindex = dev->ifindex;
138 /* XXX
139 * For hosts, allow link-local or matching prefix anycasts.
140 * This obviates the need for propagating anycast routes while
141 * still allowing some non-router anycast participation.
143 if (!ip6_onlink(addr, dev)) {
144 if (ishost)
145 err = -EADDRNOTAVAIL;
146 if (err)
147 goto out_dev_put;
150 err = ipv6_dev_ac_inc(dev, addr);
151 if (err)
152 goto out_dev_put;
154 write_lock_bh(&ipv6_sk_ac_lock);
155 pac->acl_next = np->ipv6_ac_list;
156 np->ipv6_ac_list = pac;
157 write_unlock_bh(&ipv6_sk_ac_lock);
159 dev_put(dev);
161 return 0;
163 out_dev_put:
164 dev_put(dev);
165 out_free_pac:
166 sock_kfree_s(sk, pac, sizeof(*pac));
167 return err;
171 * socket leave an anycast group
173 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
175 struct ipv6_pinfo *np = inet6_sk(sk);
176 struct net_device *dev;
177 struct ipv6_ac_socklist *pac, *prev_pac;
179 write_lock_bh(&ipv6_sk_ac_lock);
180 prev_pac = NULL;
181 for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) {
182 if ((ifindex == 0 || pac->acl_ifindex == ifindex) &&
183 ipv6_addr_equal(&pac->acl_addr, addr))
184 break;
185 prev_pac = pac;
187 if (!pac) {
188 write_unlock_bh(&ipv6_sk_ac_lock);
189 return -ENOENT;
191 if (prev_pac)
192 prev_pac->acl_next = pac->acl_next;
193 else
194 np->ipv6_ac_list = pac->acl_next;
196 write_unlock_bh(&ipv6_sk_ac_lock);
198 dev = dev_get_by_index(pac->acl_ifindex);
199 if (dev) {
200 ipv6_dev_ac_dec(dev, &pac->acl_addr);
201 dev_put(dev);
203 sock_kfree_s(sk, pac, sizeof(*pac));
204 return 0;
207 void ipv6_sock_ac_close(struct sock *sk)
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct net_device *dev = NULL;
211 struct ipv6_ac_socklist *pac;
212 int prev_index;
214 write_lock_bh(&ipv6_sk_ac_lock);
215 pac = np->ipv6_ac_list;
216 np->ipv6_ac_list = NULL;
217 write_unlock_bh(&ipv6_sk_ac_lock);
219 prev_index = 0;
220 while (pac) {
221 struct ipv6_ac_socklist *next = pac->acl_next;
223 if (pac->acl_ifindex != prev_index) {
224 if (dev)
225 dev_put(dev);
226 dev = dev_get_by_index(pac->acl_ifindex);
227 prev_index = pac->acl_ifindex;
229 if (dev)
230 ipv6_dev_ac_dec(dev, &pac->acl_addr);
231 sock_kfree_s(sk, pac, sizeof(*pac));
232 pac = next;
234 if (dev)
235 dev_put(dev);
238 #if 0
239 /* The function is not used, which is funny. Apparently, author
240 * supposed to use it to filter out datagrams inside udp/raw but forgot.
242 * It is OK, anycasts are not special comparing to delivery to unicasts.
245 int inet6_ac_check(struct sock *sk, struct in6_addr *addr, int ifindex)
247 struct ipv6_ac_socklist *pac;
248 struct ipv6_pinfo *np = inet6_sk(sk);
249 int found;
251 found = 0;
252 read_lock(&ipv6_sk_ac_lock);
253 for (pac=np->ipv6_ac_list; pac; pac=pac->acl_next) {
254 if (ifindex && pac->acl_ifindex != ifindex)
255 continue;
256 found = ipv6_addr_equal(&pac->acl_addr, addr);
257 if (found)
258 break;
260 read_unlock(&ipv6_sk_ac_lock);
262 return found;
265 #endif
267 static void aca_put(struct ifacaddr6 *ac)
269 if (atomic_dec_and_test(&ac->aca_refcnt)) {
270 in6_dev_put(ac->aca_idev);
271 dst_release(&ac->aca_rt->u.dst);
272 kfree(ac);
277 * device anycast group inc (add if not found)
279 int ipv6_dev_ac_inc(struct net_device *dev, struct in6_addr *addr)
281 struct ifacaddr6 *aca;
282 struct inet6_dev *idev;
283 struct rt6_info *rt;
284 int err;
286 idev = in6_dev_get(dev);
288 if (idev == NULL)
289 return -EINVAL;
291 write_lock_bh(&idev->lock);
292 if (idev->dead) {
293 err = -ENODEV;
294 goto out;
297 for (aca = idev->ac_list; aca; aca = aca->aca_next) {
298 if (ipv6_addr_equal(&aca->aca_addr, addr)) {
299 aca->aca_users++;
300 err = 0;
301 goto out;
306 * not found: create a new one.
309 aca = kzalloc(sizeof(struct ifacaddr6), GFP_ATOMIC);
311 if (aca == NULL) {
312 err = -ENOMEM;
313 goto out;
316 rt = addrconf_dst_alloc(idev, addr, 1);
317 if (IS_ERR(rt)) {
318 kfree(aca);
319 err = PTR_ERR(rt);
320 goto out;
323 ipv6_addr_copy(&aca->aca_addr, addr);
324 aca->aca_idev = idev;
325 aca->aca_rt = rt;
326 aca->aca_users = 1;
327 /* aca_tstamp should be updated upon changes */
328 aca->aca_cstamp = aca->aca_tstamp = jiffies;
329 atomic_set(&aca->aca_refcnt, 2);
330 spin_lock_init(&aca->aca_lock);
332 aca->aca_next = idev->ac_list;
333 idev->ac_list = aca;
334 write_unlock_bh(&idev->lock);
336 dst_hold(&rt->u.dst);
337 if (ip6_ins_rt(rt))
338 dst_release(&rt->u.dst);
340 addrconf_join_solict(dev, &aca->aca_addr);
342 aca_put(aca);
343 return 0;
344 out:
345 write_unlock_bh(&idev->lock);
346 in6_dev_put(idev);
347 return err;
351 * device anycast group decrement
353 int __ipv6_dev_ac_dec(struct inet6_dev *idev, struct in6_addr *addr)
355 struct ifacaddr6 *aca, *prev_aca;
357 write_lock_bh(&idev->lock);
358 prev_aca = NULL;
359 for (aca = idev->ac_list; aca; aca = aca->aca_next) {
360 if (ipv6_addr_equal(&aca->aca_addr, addr))
361 break;
362 prev_aca = aca;
364 if (!aca) {
365 write_unlock_bh(&idev->lock);
366 return -ENOENT;
368 if (--aca->aca_users > 0) {
369 write_unlock_bh(&idev->lock);
370 return 0;
372 if (prev_aca)
373 prev_aca->aca_next = aca->aca_next;
374 else
375 idev->ac_list = aca->aca_next;
376 write_unlock_bh(&idev->lock);
377 addrconf_leave_solict(idev, &aca->aca_addr);
379 dst_hold(&aca->aca_rt->u.dst);
380 if (ip6_del_rt(aca->aca_rt))
381 dst_free(&aca->aca_rt->u.dst);
382 else
383 dst_release(&aca->aca_rt->u.dst);
385 aca_put(aca);
386 return 0;
389 static int ipv6_dev_ac_dec(struct net_device *dev, struct in6_addr *addr)
391 int ret;
392 struct inet6_dev *idev = in6_dev_get(dev);
393 if (idev == NULL)
394 return -ENODEV;
395 ret = __ipv6_dev_ac_dec(idev, addr);
396 in6_dev_put(idev);
397 return ret;
401 * check if the interface has this anycast address
403 static int ipv6_chk_acast_dev(struct net_device *dev, struct in6_addr *addr)
405 struct inet6_dev *idev;
406 struct ifacaddr6 *aca;
408 idev = in6_dev_get(dev);
409 if (idev) {
410 read_lock_bh(&idev->lock);
411 for (aca = idev->ac_list; aca; aca = aca->aca_next)
412 if (ipv6_addr_equal(&aca->aca_addr, addr))
413 break;
414 read_unlock_bh(&idev->lock);
415 in6_dev_put(idev);
416 return aca != 0;
418 return 0;
422 * check if given interface (or any, if dev==0) has this anycast address
424 int ipv6_chk_acast_addr(struct net_device *dev, struct in6_addr *addr)
426 int found = 0;
428 if (dev)
429 return ipv6_chk_acast_dev(dev, addr);
430 read_lock(&dev_base_lock);
431 for_each_netdev(dev)
432 if (ipv6_chk_acast_dev(dev, addr)) {
433 found = 1;
434 break;
436 read_unlock(&dev_base_lock);
437 return found;
441 #ifdef CONFIG_PROC_FS
442 struct ac6_iter_state {
443 struct net_device *dev;
444 struct inet6_dev *idev;
447 #define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private)
449 static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq)
451 struct ifacaddr6 *im = NULL;
452 struct ac6_iter_state *state = ac6_seq_private(seq);
454 state->idev = NULL;
455 for_each_netdev(state->dev) {
456 struct inet6_dev *idev;
457 idev = in6_dev_get(state->dev);
458 if (!idev)
459 continue;
460 read_lock_bh(&idev->lock);
461 im = idev->ac_list;
462 if (im) {
463 state->idev = idev;
464 break;
466 read_unlock_bh(&idev->lock);
467 in6_dev_put(idev);
469 return im;
472 static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im)
474 struct ac6_iter_state *state = ac6_seq_private(seq);
476 im = im->aca_next;
477 while (!im) {
478 if (likely(state->idev != NULL)) {
479 read_unlock_bh(&state->idev->lock);
480 in6_dev_put(state->idev);
482 state->dev = next_net_device(state->dev);
483 if (!state->dev) {
484 state->idev = NULL;
485 break;
487 state->idev = in6_dev_get(state->dev);
488 if (!state->idev)
489 continue;
490 read_lock_bh(&state->idev->lock);
491 im = state->idev->ac_list;
493 return im;
496 static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos)
498 struct ifacaddr6 *im = ac6_get_first(seq);
499 if (im)
500 while (pos && (im = ac6_get_next(seq, im)) != NULL)
501 --pos;
502 return pos ? NULL : im;
505 static void *ac6_seq_start(struct seq_file *seq, loff_t *pos)
507 read_lock(&dev_base_lock);
508 return ac6_get_idx(seq, *pos);
511 static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
513 struct ifacaddr6 *im;
514 im = ac6_get_next(seq, v);
515 ++*pos;
516 return im;
519 static void ac6_seq_stop(struct seq_file *seq, void *v)
521 struct ac6_iter_state *state = ac6_seq_private(seq);
522 if (likely(state->idev != NULL)) {
523 read_unlock_bh(&state->idev->lock);
524 in6_dev_put(state->idev);
526 read_unlock(&dev_base_lock);
529 static int ac6_seq_show(struct seq_file *seq, void *v)
531 struct ifacaddr6 *im = (struct ifacaddr6 *)v;
532 struct ac6_iter_state *state = ac6_seq_private(seq);
534 seq_printf(seq,
535 "%-4d %-15s " NIP6_SEQFMT " %5d\n",
536 state->dev->ifindex, state->dev->name,
537 NIP6(im->aca_addr),
538 im->aca_users);
539 return 0;
542 static const struct seq_operations ac6_seq_ops = {
543 .start = ac6_seq_start,
544 .next = ac6_seq_next,
545 .stop = ac6_seq_stop,
546 .show = ac6_seq_show,
549 static int ac6_seq_open(struct inode *inode, struct file *file)
551 struct seq_file *seq;
552 int rc = -ENOMEM;
553 struct ac6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
555 if (!s)
556 goto out;
558 rc = seq_open(file, &ac6_seq_ops);
559 if (rc)
560 goto out_kfree;
562 seq = file->private_data;
563 seq->private = s;
564 out:
565 return rc;
566 out_kfree:
567 kfree(s);
568 goto out;
571 static const struct file_operations ac6_seq_fops = {
572 .owner = THIS_MODULE,
573 .open = ac6_seq_open,
574 .read = seq_read,
575 .llseek = seq_lseek,
576 .release = seq_release_private,
579 int __init ac6_proc_init(void)
581 if (!proc_net_fops_create("anycast6", S_IRUGO, &ac6_seq_fops))
582 return -ENOMEM;
584 return 0;
587 void ac6_proc_exit(void)
589 proc_net_remove("anycast6");
591 #endif