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bridge: add RCU annotation to bridge multicast table
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / bridge / br_multicast.c
blob326e599f83fb2a8fa80b55a46819e708f7040a14
1 /*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13 #include <linux/err.h>
14 #include <linux/if_ether.h>
15 #include <linux/igmp.h>
16 #include <linux/jhash.h>
17 #include <linux/kernel.h>
18 #include <linux/log2.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter_bridge.h>
21 #include <linux/random.h>
22 #include <linux/rculist.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
26 #include <net/ip.h>
27 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
28 #include <net/ipv6.h>
29 #include <net/mld.h>
30 #include <net/addrconf.h>
31 #include <net/ip6_checksum.h>
32 #endif
33
34 #include "br_private.h"
35
36 #define mlock_dereference(X, br) \
37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
38
39 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40 static inline int ipv6_is_local_multicast(const struct in6_addr *addr)
41 {
42 if (ipv6_addr_is_multicast(addr) &&
43 IPV6_ADDR_MC_SCOPE(addr) <= IPV6_ADDR_SCOPE_LINKLOCAL)
44 return 1;
45 return 0;
46 }
47 #endif
48
49 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
50 {
51 if (a->proto != b->proto)
52 return 0;
53 switch (a->proto) {
54 case htons(ETH_P_IP):
55 return a->u.ip4 == b->u.ip4;
56 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
57 case htons(ETH_P_IPV6):
58 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
59 #endif
60 }
61 return 0;
62 }
63
64 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
65 {
66 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
67 }
68
69 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
70 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
71 const struct in6_addr *ip)
72 {
73 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
74 }
75 #endif
76
77 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
78 struct br_ip *ip)
79 {
80 switch (ip->proto) {
81 case htons(ETH_P_IP):
82 return __br_ip4_hash(mdb, ip->u.ip4);
83 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
84 case htons(ETH_P_IPV6):
85 return __br_ip6_hash(mdb, &ip->u.ip6);
86 #endif
87 }
88 return 0;
89 }
90
91 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
92 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
93 {
94 struct net_bridge_mdb_entry *mp;
95 struct hlist_node *p;
96
97 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
98 if (br_ip_equal(&mp->addr, dst))
99 return mp;
100 }
101
102 return NULL;
103 }
104
105 static struct net_bridge_mdb_entry *br_mdb_ip_get(
106 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
107 {
108 if (!mdb)
109 return NULL;
110
111 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
112 }
113
114 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
115 struct net_bridge_mdb_htable *mdb, __be32 dst)
116 {
117 struct br_ip br_dst;
118
119 br_dst.u.ip4 = dst;
120 br_dst.proto = htons(ETH_P_IP);
121
122 return br_mdb_ip_get(mdb, &br_dst);
123 }
124
125 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
126 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
127 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
128 {
129 struct br_ip br_dst;
130
131 ipv6_addr_copy(&br_dst.u.ip6, dst);
132 br_dst.proto = htons(ETH_P_IPV6);
133
134 return br_mdb_ip_get(mdb, &br_dst);
135 }
136 #endif
137
138 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
139 struct sk_buff *skb)
140 {
141 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
142 struct br_ip ip;
143
144 if (br->multicast_disabled)
145 return NULL;
146
147 if (BR_INPUT_SKB_CB(skb)->igmp)
148 return NULL;
149
150 ip.proto = skb->protocol;
151
152 switch (skb->protocol) {
153 case htons(ETH_P_IP):
154 ip.u.ip4 = ip_hdr(skb)->daddr;
155 break;
156 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
157 case htons(ETH_P_IPV6):
158 ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr);
159 break;
160 #endif
161 default:
162 return NULL;
163 }
164
165 return br_mdb_ip_get(mdb, &ip);
166 }
167
168 static void br_mdb_free(struct rcu_head *head)
169 {
170 struct net_bridge_mdb_htable *mdb =
171 container_of(head, struct net_bridge_mdb_htable, rcu);
172 struct net_bridge_mdb_htable *old = mdb->old;
173
174 mdb->old = NULL;
175 kfree(old->mhash);
176 kfree(old);
177 }
178
179 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
180 struct net_bridge_mdb_htable *old,
181 int elasticity)
182 {
183 struct net_bridge_mdb_entry *mp;
184 struct hlist_node *p;
185 int maxlen;
186 int len;
187 int i;
188
189 for (i = 0; i < old->max; i++)
190 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
191 hlist_add_head(&mp->hlist[new->ver],
192 &new->mhash[br_ip_hash(new, &mp->addr)]);
193
194 if (!elasticity)
195 return 0;
196
197 maxlen = 0;
198 for (i = 0; i < new->max; i++) {
199 len = 0;
200 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
201 len++;
202 if (len > maxlen)
203 maxlen = len;
204 }
205
206 return maxlen > elasticity ? -EINVAL : 0;
207 }
208
209 static void br_multicast_free_pg(struct rcu_head *head)
210 {
211 struct net_bridge_port_group *p =
212 container_of(head, struct net_bridge_port_group, rcu);
213
214 kfree(p);
215 }
216
217 static void br_multicast_free_group(struct rcu_head *head)
218 {
219 struct net_bridge_mdb_entry *mp =
220 container_of(head, struct net_bridge_mdb_entry, rcu);
221
222 kfree(mp);
223 }
224
225 static void br_multicast_group_expired(unsigned long data)
226 {
227 struct net_bridge_mdb_entry *mp = (void *)data;
228 struct net_bridge *br = mp->br;
229 struct net_bridge_mdb_htable *mdb;
230
231 spin_lock(&br->multicast_lock);
232 if (!netif_running(br->dev) || timer_pending(&mp->timer))
233 goto out;
234
235 if (!hlist_unhashed(&mp->mglist))
236 hlist_del_init(&mp->mglist);
237
238 if (mp->ports)
239 goto out;
240
241 mdb = mlock_dereference(br->mdb, br);
242
243 hlist_del_rcu(&mp->hlist[mdb->ver]);
244 mdb->size--;
245
246 del_timer(&mp->query_timer);
247 call_rcu_bh(&mp->rcu, br_multicast_free_group);
248
249 out:
250 spin_unlock(&br->multicast_lock);
251 }
252
253 static void br_multicast_del_pg(struct net_bridge *br,
254 struct net_bridge_port_group *pg)
255 {
256 struct net_bridge_mdb_htable *mdb;
257 struct net_bridge_mdb_entry *mp;
258 struct net_bridge_port_group *p;
259 struct net_bridge_port_group __rcu **pp;
260
261 mdb = mlock_dereference(br->mdb, br);
262
263 mp = br_mdb_ip_get(mdb, &pg->addr);
264 if (WARN_ON(!mp))
265 return;
266
267 for (pp = &mp->ports;
268 (p = mlock_dereference(*pp, br)) != NULL;
269 pp = &p->next) {
270 if (p != pg)
271 continue;
272
273 rcu_assign_pointer(*pp, p->next);
274 hlist_del_init(&p->mglist);
275 del_timer(&p->timer);
276 del_timer(&p->query_timer);
277 call_rcu_bh(&p->rcu, br_multicast_free_pg);
278
279 if (!mp->ports && hlist_unhashed(&mp->mglist) &&
280 netif_running(br->dev))
281 mod_timer(&mp->timer, jiffies);
282
283 return;
284 }
285
286 WARN_ON(1);
287 }
288
289 static void br_multicast_port_group_expired(unsigned long data)
290 {
291 struct net_bridge_port_group *pg = (void *)data;
292 struct net_bridge *br = pg->port->br;
293
294 spin_lock(&br->multicast_lock);
295 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
296 hlist_unhashed(&pg->mglist))
297 goto out;
298
299 br_multicast_del_pg(br, pg);
300
301 out:
302 spin_unlock(&br->multicast_lock);
303 }
304
305 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
306 int elasticity)
307 {
308 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
309 struct net_bridge_mdb_htable *mdb;
310 int err;
311
312 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
313 if (!mdb)
314 return -ENOMEM;
315
316 mdb->max = max;
317 mdb->old = old;
318
319 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
320 if (!mdb->mhash) {
321 kfree(mdb);
322 return -ENOMEM;
323 }
324
325 mdb->size = old ? old->size : 0;
326 mdb->ver = old ? old->ver ^ 1 : 0;
327
328 if (!old || elasticity)
329 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
330 else
331 mdb->secret = old->secret;
332
333 if (!old)
334 goto out;
335
336 err = br_mdb_copy(mdb, old, elasticity);
337 if (err) {
338 kfree(mdb->mhash);
339 kfree(mdb);
340 return err;
341 }
342
343 call_rcu_bh(&mdb->rcu, br_mdb_free);
344
345 out:
346 rcu_assign_pointer(*mdbp, mdb);
347
348 return 0;
349 }
350
351 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
352 __be32 group)
353 {
354 struct sk_buff *skb;
355 struct igmphdr *ih;
356 struct ethhdr *eth;
357 struct iphdr *iph;
358
359 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
360 sizeof(*ih) + 4);
361 if (!skb)
362 goto out;
363
364 skb->protocol = htons(ETH_P_IP);
365
366 skb_reset_mac_header(skb);
367 eth = eth_hdr(skb);
368
369 memcpy(eth->h_source, br->dev->dev_addr, 6);
370 eth->h_dest[0] = 1;
371 eth->h_dest[1] = 0;
372 eth->h_dest[2] = 0x5e;
373 eth->h_dest[3] = 0;
374 eth->h_dest[4] = 0;
375 eth->h_dest[5] = 1;
376 eth->h_proto = htons(ETH_P_IP);
377 skb_put(skb, sizeof(*eth));
378
379 skb_set_network_header(skb, skb->len);
380 iph = ip_hdr(skb);
381
382 iph->version = 4;
383 iph->ihl = 6;
384 iph->tos = 0xc0;
385 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
386 iph->id = 0;
387 iph->frag_off = htons(IP_DF);
388 iph->ttl = 1;
389 iph->protocol = IPPROTO_IGMP;
390 iph->saddr = 0;
391 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
392 ((u8 *)&iph[1])[0] = IPOPT_RA;
393 ((u8 *)&iph[1])[1] = 4;
394 ((u8 *)&iph[1])[2] = 0;
395 ((u8 *)&iph[1])[3] = 0;
396 ip_send_check(iph);
397 skb_put(skb, 24);
398
399 skb_set_transport_header(skb, skb->len);
400 ih = igmp_hdr(skb);
401 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
402 ih->code = (group ? br->multicast_last_member_interval :
403 br->multicast_query_response_interval) /
404 (HZ / IGMP_TIMER_SCALE);
405 ih->group = group;
406 ih->csum = 0;
407 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
408 skb_put(skb, sizeof(*ih));
409
410 __skb_pull(skb, sizeof(*eth));
411
412 out:
413 return skb;
414 }
415
416 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
417 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
418 struct in6_addr *group)
419 {
420 struct sk_buff *skb;
421 struct ipv6hdr *ip6h;
422 struct mld_msg *mldq;
423 struct ethhdr *eth;
424 u8 *hopopt;
425 unsigned long interval;
426
427 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
428 8 + sizeof(*mldq));
429 if (!skb)
430 goto out;
431
432 skb->protocol = htons(ETH_P_IPV6);
433
434 /* Ethernet header */
435 skb_reset_mac_header(skb);
436 eth = eth_hdr(skb);
437
438 memcpy(eth->h_source, br->dev->dev_addr, 6);
439 ipv6_eth_mc_map(group, eth->h_dest);
440 eth->h_proto = htons(ETH_P_IPV6);
441 skb_put(skb, sizeof(*eth));
442
443 /* IPv6 header + HbH option */
444 skb_set_network_header(skb, skb->len);
445 ip6h = ipv6_hdr(skb);
446
447 *(__force __be32 *)ip6h = htonl(0x60000000);
448 ip6h->payload_len = 8 + sizeof(*mldq);
449 ip6h->nexthdr = IPPROTO_HOPOPTS;
450 ip6h->hop_limit = 1;
451 ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0);
452 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
453
454 hopopt = (u8 *)(ip6h + 1);
455 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
456 hopopt[1] = 0; /* length of HbH */
457 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
458 hopopt[3] = 2; /* Length of RA Option */
459 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
460 hopopt[5] = 0;
461 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */
462 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */
463
464 skb_put(skb, sizeof(*ip6h) + 8);
465
466 /* ICMPv6 */
467 skb_set_transport_header(skb, skb->len);
468 mldq = (struct mld_msg *) icmp6_hdr(skb);
469
470 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
471 br->multicast_query_response_interval;
472
473 mldq->mld_type = ICMPV6_MGM_QUERY;
474 mldq->mld_code = 0;
475 mldq->mld_cksum = 0;
476 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
477 mldq->mld_reserved = 0;
478 ipv6_addr_copy(&mldq->mld_mca, group);
479
480 /* checksum */
481 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
482 sizeof(*mldq), IPPROTO_ICMPV6,
483 csum_partial(mldq,
484 sizeof(*mldq), 0));
485 skb_put(skb, sizeof(*mldq));
486
487 __skb_pull(skb, sizeof(*eth));
488
489 out:
490 return skb;
491 }
492 #endif
493
494 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
495 struct br_ip *addr)
496 {
497 switch (addr->proto) {
498 case htons(ETH_P_IP):
499 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
500 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
501 case htons(ETH_P_IPV6):
502 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
503 #endif
504 }
505 return NULL;
506 }
507
508 static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
509 {
510 struct net_bridge *br = mp->br;
511 struct sk_buff *skb;
512
513 skb = br_multicast_alloc_query(br, &mp->addr);
514 if (!skb)
515 goto timer;
516
517 netif_rx(skb);
518
519 timer:
520 if (++mp->queries_sent < br->multicast_last_member_count)
521 mod_timer(&mp->query_timer,
522 jiffies + br->multicast_last_member_interval);
523 }
524
525 static void br_multicast_group_query_expired(unsigned long data)
526 {
527 struct net_bridge_mdb_entry *mp = (void *)data;
528 struct net_bridge *br = mp->br;
529
530 spin_lock(&br->multicast_lock);
531 if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
532 mp->queries_sent >= br->multicast_last_member_count)
533 goto out;
534
535 br_multicast_send_group_query(mp);
536
537 out:
538 spin_unlock(&br->multicast_lock);
539 }
540
541 static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
542 {
543 struct net_bridge_port *port = pg->port;
544 struct net_bridge *br = port->br;
545 struct sk_buff *skb;
546
547 skb = br_multicast_alloc_query(br, &pg->addr);
548 if (!skb)
549 goto timer;
550
551 br_deliver(port, skb);
552
553 timer:
554 if (++pg->queries_sent < br->multicast_last_member_count)
555 mod_timer(&pg->query_timer,
556 jiffies + br->multicast_last_member_interval);
557 }
558
559 static void br_multicast_port_group_query_expired(unsigned long data)
560 {
561 struct net_bridge_port_group *pg = (void *)data;
562 struct net_bridge_port *port = pg->port;
563 struct net_bridge *br = port->br;
564
565 spin_lock(&br->multicast_lock);
566 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
567 pg->queries_sent >= br->multicast_last_member_count)
568 goto out;
569
570 br_multicast_send_port_group_query(pg);
571
572 out:
573 spin_unlock(&br->multicast_lock);
574 }
575
576 static struct net_bridge_mdb_entry *br_multicast_get_group(
577 struct net_bridge *br, struct net_bridge_port *port,
578 struct br_ip *group, int hash)
579 {
580 struct net_bridge_mdb_htable *mdb;
581 struct net_bridge_mdb_entry *mp;
582 struct hlist_node *p;
583 unsigned count = 0;
584 unsigned max;
585 int elasticity;
586 int err;
587
588 mdb = rcu_dereference_protected(br->mdb, 1);
589 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
590 count++;
591 if (unlikely(br_ip_equal(group, &mp->addr)))
592 return mp;
593 }
594
595 elasticity = 0;
596 max = mdb->max;
597
598 if (unlikely(count > br->hash_elasticity && count)) {
599 if (net_ratelimit())
600 br_info(br, "Multicast hash table "
601 "chain limit reached: %s\n",
602 port ? port->dev->name : br->dev->name);
603
604 elasticity = br->hash_elasticity;
605 }
606
607 if (mdb->size >= max) {
608 max *= 2;
609 if (unlikely(max >= br->hash_max)) {
610 br_warn(br, "Multicast hash table maximum "
611 "reached, disabling snooping: %s, %d\n",
612 port ? port->dev->name : br->dev->name, max);
613 err = -E2BIG;
614 disable:
615 br->multicast_disabled = 1;
616 goto err;
617 }
618 }
619
620 if (max > mdb->max || elasticity) {
621 if (mdb->old) {
622 if (net_ratelimit())
623 br_info(br, "Multicast hash table "
624 "on fire: %s\n",
625 port ? port->dev->name : br->dev->name);
626 err = -EEXIST;
627 goto err;
628 }
629
630 err = br_mdb_rehash(&br->mdb, max, elasticity);
631 if (err) {
632 br_warn(br, "Cannot rehash multicast "
633 "hash table, disabling snooping: %s, %d, %d\n",
634 port ? port->dev->name : br->dev->name,
635 mdb->size, err);
636 goto disable;
637 }
638
639 err = -EAGAIN;
640 goto err;
641 }
642
643 return NULL;
644
645 err:
646 mp = ERR_PTR(err);
647 return mp;
648 }
649
650 static struct net_bridge_mdb_entry *br_multicast_new_group(
651 struct net_bridge *br, struct net_bridge_port *port,
652 struct br_ip *group)
653 {
654 struct net_bridge_mdb_htable *mdb;
655 struct net_bridge_mdb_entry *mp;
656 int hash;
657
658 mdb = rcu_dereference_protected(br->mdb, 1);
659 if (!mdb) {
660 if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0))
661 return NULL;
662 goto rehash;
663 }
664
665 hash = br_ip_hash(mdb, group);
666 mp = br_multicast_get_group(br, port, group, hash);
667 switch (PTR_ERR(mp)) {
668 case 0:
669 break;
670
671 case -EAGAIN:
672 rehash:
673 mdb = rcu_dereference_protected(br->mdb, 1);
674 hash = br_ip_hash(mdb, group);
675 break;
676
677 default:
678 goto out;
679 }
680
681 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
682 if (unlikely(!mp))
683 goto out;
684
685 mp->br = br;
686 mp->addr = *group;
687 setup_timer(&mp->timer, br_multicast_group_expired,
688 (unsigned long)mp);
689 setup_timer(&mp->query_timer, br_multicast_group_query_expired,
690 (unsigned long)mp);
691
692 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
693 mdb->size++;
694
695 out:
696 return mp;
697 }
698
699 static int br_multicast_add_group(struct net_bridge *br,
700 struct net_bridge_port *port,
701 struct br_ip *group)
702 {
703 struct net_bridge_mdb_entry *mp;
704 struct net_bridge_port_group *p;
705 struct net_bridge_port_group __rcu **pp;
706 unsigned long now = jiffies;
707 int err;
708
709 spin_lock(&br->multicast_lock);
710 if (!netif_running(br->dev) ||
711 (port && port->state == BR_STATE_DISABLED))
712 goto out;
713
714 mp = br_multicast_new_group(br, port, group);
715 err = PTR_ERR(mp);
716 if (unlikely(IS_ERR(mp) || !mp))
717 goto err;
718
719 if (!port) {
720 hlist_add_head(&mp->mglist, &br->mglist);
721 mod_timer(&mp->timer, now + br->multicast_membership_interval);
722 goto out;
723 }
724
725 for (pp = &mp->ports;
726 (p = mlock_dereference(*pp, br)) != NULL;
727 pp = &p->next) {
728 if (p->port == port)
729 goto found;
730 if ((unsigned long)p->port < (unsigned long)port)
731 break;
732 }
733
734 p = kzalloc(sizeof(*p), GFP_ATOMIC);
735 err = -ENOMEM;
736 if (unlikely(!p))
737 goto err;
738
739 p->addr = *group;
740 p->port = port;
741 p->next = *pp;
742 hlist_add_head(&p->mglist, &port->mglist);
743 setup_timer(&p->timer, br_multicast_port_group_expired,
744 (unsigned long)p);
745 setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
746 (unsigned long)p);
747
748 rcu_assign_pointer(*pp, p);
749
750 found:
751 mod_timer(&p->timer, now + br->multicast_membership_interval);
752 out:
753 err = 0;
754
755 err:
756 spin_unlock(&br->multicast_lock);
757 return err;
758 }
759
760 static int br_ip4_multicast_add_group(struct net_bridge *br,
761 struct net_bridge_port *port,
762 __be32 group)
763 {
764 struct br_ip br_group;
765
766 if (ipv4_is_local_multicast(group))
767 return 0;
768
769 br_group.u.ip4 = group;
770 br_group.proto = htons(ETH_P_IP);
771
772 return br_multicast_add_group(br, port, &br_group);
773 }
774
775 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
776 static int br_ip6_multicast_add_group(struct net_bridge *br,
777 struct net_bridge_port *port,
778 const struct in6_addr *group)
779 {
780 struct br_ip br_group;
781
782 if (ipv6_is_local_multicast(group))
783 return 0;
784
785 ipv6_addr_copy(&br_group.u.ip6, group);
786 br_group.proto = htons(ETH_P_IP);
787
788 return br_multicast_add_group(br, port, &br_group);
789 }
790 #endif
791
792 static void br_multicast_router_expired(unsigned long data)
793 {
794 struct net_bridge_port *port = (void *)data;
795 struct net_bridge *br = port->br;
796
797 spin_lock(&br->multicast_lock);
798 if (port->multicast_router != 1 ||
799 timer_pending(&port->multicast_router_timer) ||
800 hlist_unhashed(&port->rlist))
801 goto out;
802
803 hlist_del_init_rcu(&port->rlist);
804
805 out:
806 spin_unlock(&br->multicast_lock);
807 }
808
809 static void br_multicast_local_router_expired(unsigned long data)
810 {
811 }
812
813 static void __br_multicast_send_query(struct net_bridge *br,
814 struct net_bridge_port *port,
815 struct br_ip *ip)
816 {
817 struct sk_buff *skb;
818
819 skb = br_multicast_alloc_query(br, ip);
820 if (!skb)
821 return;
822
823 if (port) {
824 __skb_push(skb, sizeof(struct ethhdr));
825 skb->dev = port->dev;
826 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
827 dev_queue_xmit);
828 } else
829 netif_rx(skb);
830 }
831
832 static void br_multicast_send_query(struct net_bridge *br,
833 struct net_bridge_port *port, u32 sent)
834 {
835 unsigned long time;
836 struct br_ip br_group;
837
838 if (!netif_running(br->dev) || br->multicast_disabled ||
839 timer_pending(&br->multicast_querier_timer))
840 return;
841
842 memset(&br_group.u, 0, sizeof(br_group.u));
843
844 br_group.proto = htons(ETH_P_IP);
845 __br_multicast_send_query(br, port, &br_group);
846
847 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
848 br_group.proto = htons(ETH_P_IPV6);
849 __br_multicast_send_query(br, port, &br_group);
850 #endif
851
852 time = jiffies;
853 time += sent < br->multicast_startup_query_count ?
854 br->multicast_startup_query_interval :
855 br->multicast_query_interval;
856 mod_timer(port ? &port->multicast_query_timer :
857 &br->multicast_query_timer, time);
858 }
859
860 static void br_multicast_port_query_expired(unsigned long data)
861 {
862 struct net_bridge_port *port = (void *)data;
863 struct net_bridge *br = port->br;
864
865 spin_lock(&br->multicast_lock);
866 if (port->state == BR_STATE_DISABLED ||
867 port->state == BR_STATE_BLOCKING)
868 goto out;
869
870 if (port->multicast_startup_queries_sent <
871 br->multicast_startup_query_count)
872 port->multicast_startup_queries_sent++;
873
874 br_multicast_send_query(port->br, port,
875 port->multicast_startup_queries_sent);
876
877 out:
878 spin_unlock(&br->multicast_lock);
879 }
880
881 void br_multicast_add_port(struct net_bridge_port *port)
882 {
883 port->multicast_router = 1;
884
885 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
886 (unsigned long)port);
887 setup_timer(&port->multicast_query_timer,
888 br_multicast_port_query_expired, (unsigned long)port);
889 }
890
891 void br_multicast_del_port(struct net_bridge_port *port)
892 {
893 del_timer_sync(&port->multicast_router_timer);
894 }
895
896 static void __br_multicast_enable_port(struct net_bridge_port *port)
897 {
898 port->multicast_startup_queries_sent = 0;
899
900 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
901 del_timer(&port->multicast_query_timer))
902 mod_timer(&port->multicast_query_timer, jiffies);
903 }
904
905 void br_multicast_enable_port(struct net_bridge_port *port)
906 {
907 struct net_bridge *br = port->br;
908
909 spin_lock(&br->multicast_lock);
910 if (br->multicast_disabled || !netif_running(br->dev))
911 goto out;
912
913 __br_multicast_enable_port(port);
914
915 out:
916 spin_unlock(&br->multicast_lock);
917 }
918
919 void br_multicast_disable_port(struct net_bridge_port *port)
920 {
921 struct net_bridge *br = port->br;
922 struct net_bridge_port_group *pg;
923 struct hlist_node *p, *n;
924
925 spin_lock(&br->multicast_lock);
926 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
927 br_multicast_del_pg(br, pg);
928
929 if (!hlist_unhashed(&port->rlist))
930 hlist_del_init_rcu(&port->rlist);
931 del_timer(&port->multicast_router_timer);
932 del_timer(&port->multicast_query_timer);
933 spin_unlock(&br->multicast_lock);
934 }
935
936 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
937 struct net_bridge_port *port,
938 struct sk_buff *skb)
939 {
940 struct igmpv3_report *ih;
941 struct igmpv3_grec *grec;
942 int i;
943 int len;
944 int num;
945 int type;
946 int err = 0;
947 __be32 group;
948
949 if (!pskb_may_pull(skb, sizeof(*ih)))
950 return -EINVAL;
951
952 ih = igmpv3_report_hdr(skb);
953 num = ntohs(ih->ngrec);
954 len = sizeof(*ih);
955
956 for (i = 0; i < num; i++) {
957 len += sizeof(*grec);
958 if (!pskb_may_pull(skb, len))
959 return -EINVAL;
960
961 grec = (void *)(skb->data + len - sizeof(*grec));
962 group = grec->grec_mca;
963 type = grec->grec_type;
964
965 len += ntohs(grec->grec_nsrcs) * 4;
966 if (!pskb_may_pull(skb, len))
967 return -EINVAL;
968
969 /* We treat this as an IGMPv2 report for now. */
970 switch (type) {
971 case IGMPV3_MODE_IS_INCLUDE:
972 case IGMPV3_MODE_IS_EXCLUDE:
973 case IGMPV3_CHANGE_TO_INCLUDE:
974 case IGMPV3_CHANGE_TO_EXCLUDE:
975 case IGMPV3_ALLOW_NEW_SOURCES:
976 case IGMPV3_BLOCK_OLD_SOURCES:
977 break;
978
979 default:
980 continue;
981 }
982
983 err = br_ip4_multicast_add_group(br, port, group);
984 if (err)
985 break;
986 }
987
988 return err;
989 }
990
991 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
992 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
993 struct net_bridge_port *port,
994 struct sk_buff *skb)
995 {
996 struct icmp6hdr *icmp6h;
997 struct mld2_grec *grec;
998 int i;
999 int len;
1000 int num;
1001 int err = 0;
1002
1003 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1004 return -EINVAL;
1005
1006 icmp6h = icmp6_hdr(skb);
1007 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1008 len = sizeof(*icmp6h);
1009
1010 for (i = 0; i < num; i++) {
1011 __be16 *nsrcs, _nsrcs;
1012
1013 nsrcs = skb_header_pointer(skb,
1014 len + offsetof(struct mld2_grec,
1015 grec_mca),
1016 sizeof(_nsrcs), &_nsrcs);
1017 if (!nsrcs)
1018 return -EINVAL;
1019
1020 if (!pskb_may_pull(skb,
1021 len + sizeof(*grec) +
1022 sizeof(struct in6_addr) * (*nsrcs)))
1023 return -EINVAL;
1024
1025 grec = (struct mld2_grec *)(skb->data + len);
1026 len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs);
1027
1028 /* We treat these as MLDv1 reports for now. */
1029 switch (grec->grec_type) {
1030 case MLD2_MODE_IS_INCLUDE:
1031 case MLD2_MODE_IS_EXCLUDE:
1032 case MLD2_CHANGE_TO_INCLUDE:
1033 case MLD2_CHANGE_TO_EXCLUDE:
1034 case MLD2_ALLOW_NEW_SOURCES:
1035 case MLD2_BLOCK_OLD_SOURCES:
1036 break;
1037
1038 default:
1039 continue;
1040 }
1041
1042 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
1043 if (!err)
1044 break;
1045 }
1046
1047 return err;
1048 }
1049 #endif
1050
1051 /*
1052 * Add port to rotuer_list
1053 * list is maintained ordered by pointer value
1054 * and locked by br->multicast_lock and RCU
1055 */
1056 static void br_multicast_add_router(struct net_bridge *br,
1057 struct net_bridge_port *port)
1058 {
1059 struct net_bridge_port *p;
1060 struct hlist_node *n, *slot = NULL;
1061
1062 hlist_for_each_entry(p, n, &br->router_list, rlist) {
1063 if ((unsigned long) port >= (unsigned long) p)
1064 break;
1065 slot = n;
1066 }
1067
1068 if (slot)
1069 hlist_add_after_rcu(slot, &port->rlist);
1070 else
1071 hlist_add_head_rcu(&port->rlist, &br->router_list);
1072 }
1073
1074 static void br_multicast_mark_router(struct net_bridge *br,
1075 struct net_bridge_port *port)
1076 {
1077 unsigned long now = jiffies;
1078
1079 if (!port) {
1080 if (br->multicast_router == 1)
1081 mod_timer(&br->multicast_router_timer,
1082 now + br->multicast_querier_interval);
1083 return;
1084 }
1085
1086 if (port->multicast_router != 1)
1087 return;
1088
1089 if (!hlist_unhashed(&port->rlist))
1090 goto timer;
1091
1092 br_multicast_add_router(br, port);
1093
1094 timer:
1095 mod_timer(&port->multicast_router_timer,
1096 now + br->multicast_querier_interval);
1097 }
1098
1099 static void br_multicast_query_received(struct net_bridge *br,
1100 struct net_bridge_port *port,
1101 int saddr)
1102 {
1103 if (saddr)
1104 mod_timer(&br->multicast_querier_timer,
1105 jiffies + br->multicast_querier_interval);
1106 else if (timer_pending(&br->multicast_querier_timer))
1107 return;
1108
1109 br_multicast_mark_router(br, port);
1110 }
1111
1112 static int br_ip4_multicast_query(struct net_bridge *br,
1113 struct net_bridge_port *port,
1114 struct sk_buff *skb)
1115 {
1116 struct iphdr *iph = ip_hdr(skb);
1117 struct igmphdr *ih = igmp_hdr(skb);
1118 struct net_bridge_mdb_entry *mp;
1119 struct igmpv3_query *ih3;
1120 struct net_bridge_port_group *p;
1121 struct net_bridge_port_group __rcu **pp;
1122 unsigned long max_delay;
1123 unsigned long now = jiffies;
1124 __be32 group;
1125 int err = 0;
1126
1127 spin_lock(&br->multicast_lock);
1128 if (!netif_running(br->dev) ||
1129 (port && port->state == BR_STATE_DISABLED))
1130 goto out;
1131
1132 br_multicast_query_received(br, port, !!iph->saddr);
1133
1134 group = ih->group;
1135
1136 if (skb->len == sizeof(*ih)) {
1137 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1138
1139 if (!max_delay) {
1140 max_delay = 10 * HZ;
1141 group = 0;
1142 }
1143 } else {
1144 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1145 err = -EINVAL;
1146 goto out;
1147 }
1148
1149 ih3 = igmpv3_query_hdr(skb);
1150 if (ih3->nsrcs)
1151 goto out;
1152
1153 max_delay = ih3->code ?
1154 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1155 }
1156
1157 if (!group)
1158 goto out;
1159
1160 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
1161 if (!mp)
1162 goto out;
1163
1164 max_delay *= br->multicast_last_member_count;
1165
1166 if (!hlist_unhashed(&mp->mglist) &&
1167 (timer_pending(&mp->timer) ?
1168 time_after(mp->timer.expires, now + max_delay) :
1169 try_to_del_timer_sync(&mp->timer) >= 0))
1170 mod_timer(&mp->timer, now + max_delay);
1171
1172 for (pp = &mp->ports;
1173 (p = mlock_dereference(*pp, br)) != NULL;
1174 pp = &p->next) {
1175 if (timer_pending(&p->timer) ?
1176 time_after(p->timer.expires, now + max_delay) :
1177 try_to_del_timer_sync(&p->timer) >= 0)
1178 mod_timer(&mp->timer, now + max_delay);
1179 }
1180
1181 out:
1182 spin_unlock(&br->multicast_lock);
1183 return err;
1184 }
1185
1186 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1187 static int br_ip6_multicast_query(struct net_bridge *br,
1188 struct net_bridge_port *port,
1189 struct sk_buff *skb)
1190 {
1191 struct ipv6hdr *ip6h = ipv6_hdr(skb);
1192 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1193 struct net_bridge_mdb_entry *mp;
1194 struct mld2_query *mld2q;
1195 struct net_bridge_port_group *p;
1196 struct net_bridge_port_group __rcu **pp;
1197 unsigned long max_delay;
1198 unsigned long now = jiffies;
1199 struct in6_addr *group = NULL;
1200 int err = 0;
1201
1202 spin_lock(&br->multicast_lock);
1203 if (!netif_running(br->dev) ||
1204 (port && port->state == BR_STATE_DISABLED))
1205 goto out;
1206
1207 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1208
1209 if (skb->len == sizeof(*mld)) {
1210 if (!pskb_may_pull(skb, sizeof(*mld))) {
1211 err = -EINVAL;
1212 goto out;
1213 }
1214 mld = (struct mld_msg *) icmp6_hdr(skb);
1215 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
1216 if (max_delay)
1217 group = &mld->mld_mca;
1218 } else if (skb->len >= sizeof(*mld2q)) {
1219 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1220 err = -EINVAL;
1221 goto out;
1222 }
1223 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1224 if (!mld2q->mld2q_nsrcs)
1225 group = &mld2q->mld2q_mca;
1226 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1227 }
1228
1229 if (!group)
1230 goto out;
1231
1232 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
1233 if (!mp)
1234 goto out;
1235
1236 max_delay *= br->multicast_last_member_count;
1237 if (!hlist_unhashed(&mp->mglist) &&
1238 (timer_pending(&mp->timer) ?
1239 time_after(mp->timer.expires, now + max_delay) :
1240 try_to_del_timer_sync(&mp->timer) >= 0))
1241 mod_timer(&mp->timer, now + max_delay);
1242
1243 for (pp = &mp->ports;
1244 (p = mlock_dereference(*pp, br)) != NULL;
1245 pp = &p->next) {
1246 if (timer_pending(&p->timer) ?
1247 time_after(p->timer.expires, now + max_delay) :
1248 try_to_del_timer_sync(&p->timer) >= 0)
1249 mod_timer(&mp->timer, now + max_delay);
1250 }
1251
1252 out:
1253 spin_unlock(&br->multicast_lock);
1254 return err;
1255 }
1256 #endif
1257
1258 static void br_multicast_leave_group(struct net_bridge *br,
1259 struct net_bridge_port *port,
1260 struct br_ip *group)
1261 {
1262 struct net_bridge_mdb_htable *mdb;
1263 struct net_bridge_mdb_entry *mp;
1264 struct net_bridge_port_group *p;
1265 unsigned long now;
1266 unsigned long time;
1267
1268 spin_lock(&br->multicast_lock);
1269 if (!netif_running(br->dev) ||
1270 (port && port->state == BR_STATE_DISABLED) ||
1271 timer_pending(&br->multicast_querier_timer))
1272 goto out;
1273
1274 mdb = mlock_dereference(br->mdb, br);
1275 mp = br_mdb_ip_get(mdb, group);
1276 if (!mp)
1277 goto out;
1278
1279 now = jiffies;
1280 time = now + br->multicast_last_member_count *
1281 br->multicast_last_member_interval;
1282
1283 if (!port) {
1284 if (!hlist_unhashed(&mp->mglist) &&
1285 (timer_pending(&mp->timer) ?
1286 time_after(mp->timer.expires, time) :
1287 try_to_del_timer_sync(&mp->timer) >= 0)) {
1288 mod_timer(&mp->timer, time);
1289
1290 mp->queries_sent = 0;
1291 mod_timer(&mp->query_timer, now);
1292 }
1293
1294 goto out;
1295 }
1296
1297 for (p = mlock_dereference(mp->ports, br);
1298 p != NULL;
1299 p = mlock_dereference(p->next, br)) {
1300 if (p->port != port)
1301 continue;
1302
1303 if (!hlist_unhashed(&p->mglist) &&
1304 (timer_pending(&p->timer) ?
1305 time_after(p->timer.expires, time) :
1306 try_to_del_timer_sync(&p->timer) >= 0)) {
1307 mod_timer(&p->timer, time);
1308
1309 p->queries_sent = 0;
1310 mod_timer(&p->query_timer, now);
1311 }
1312
1313 break;
1314 }
1315
1316 out:
1317 spin_unlock(&br->multicast_lock);
1318 }
1319
1320 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1321 struct net_bridge_port *port,
1322 __be32 group)
1323 {
1324 struct br_ip br_group;
1325
1326 if (ipv4_is_local_multicast(group))
1327 return;
1328
1329 br_group.u.ip4 = group;
1330 br_group.proto = htons(ETH_P_IP);
1331
1332 br_multicast_leave_group(br, port, &br_group);
1333 }
1334
1335 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1336 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1337 struct net_bridge_port *port,
1338 const struct in6_addr *group)
1339 {
1340 struct br_ip br_group;
1341
1342 if (ipv6_is_local_multicast(group))
1343 return;
1344
1345 ipv6_addr_copy(&br_group.u.ip6, group);
1346 br_group.proto = htons(ETH_P_IPV6);
1347
1348 br_multicast_leave_group(br, port, &br_group);
1349 }
1350 #endif
1351
1352 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1353 struct net_bridge_port *port,
1354 struct sk_buff *skb)
1355 {
1356 struct sk_buff *skb2 = skb;
1357 struct iphdr *iph;
1358 struct igmphdr *ih;
1359 unsigned len;
1360 unsigned offset;
1361 int err;
1362
1363 /* We treat OOM as packet loss for now. */
1364 if (!pskb_may_pull(skb, sizeof(*iph)))
1365 return -EINVAL;
1366
1367 iph = ip_hdr(skb);
1368
1369 if (iph->ihl < 5 || iph->version != 4)
1370 return -EINVAL;
1371
1372 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1373 return -EINVAL;
1374
1375 iph = ip_hdr(skb);
1376
1377 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1378 return -EINVAL;
1379
1380 if (iph->protocol != IPPROTO_IGMP)
1381 return 0;
1382
1383 len = ntohs(iph->tot_len);
1384 if (skb->len < len || len < ip_hdrlen(skb))
1385 return -EINVAL;
1386
1387 if (skb->len > len) {
1388 skb2 = skb_clone(skb, GFP_ATOMIC);
1389 if (!skb2)
1390 return -ENOMEM;
1391
1392 err = pskb_trim_rcsum(skb2, len);
1393 if (err)
1394 goto err_out;
1395 }
1396
1397 len -= ip_hdrlen(skb2);
1398 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1399 __skb_pull(skb2, offset);
1400 skb_reset_transport_header(skb2);
1401
1402 err = -EINVAL;
1403 if (!pskb_may_pull(skb2, sizeof(*ih)))
1404 goto out;
1405
1406 switch (skb2->ip_summed) {
1407 case CHECKSUM_COMPLETE:
1408 if (!csum_fold(skb2->csum))
1409 break;
1410 /* fall through */
1411 case CHECKSUM_NONE:
1412 skb2->csum = 0;
1413 if (skb_checksum_complete(skb2))
1414 goto out;
1415 }
1416
1417 err = 0;
1418
1419 BR_INPUT_SKB_CB(skb)->igmp = 1;
1420 ih = igmp_hdr(skb2);
1421
1422 switch (ih->type) {
1423 case IGMP_HOST_MEMBERSHIP_REPORT:
1424 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1425 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1426 err = br_ip4_multicast_add_group(br, port, ih->group);
1427 break;
1428 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1429 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1430 break;
1431 case IGMP_HOST_MEMBERSHIP_QUERY:
1432 err = br_ip4_multicast_query(br, port, skb2);
1433 break;
1434 case IGMP_HOST_LEAVE_MESSAGE:
1435 br_ip4_multicast_leave_group(br, port, ih->group);
1436 break;
1437 }
1438
1439 out:
1440 __skb_push(skb2, offset);
1441 err_out:
1442 if (skb2 != skb)
1443 kfree_skb(skb2);
1444 return err;
1445 }
1446
1447 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1448 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1449 struct net_bridge_port *port,
1450 struct sk_buff *skb)
1451 {
1452 struct sk_buff *skb2 = skb;
1453 struct ipv6hdr *ip6h;
1454 struct icmp6hdr *icmp6h;
1455 u8 nexthdr;
1456 unsigned len;
1457 int offset;
1458 int err;
1459
1460 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1461 return -EINVAL;
1462
1463 ip6h = ipv6_hdr(skb);
1464
1465 /*
1466 * We're interested in MLD messages only.
1467 * - Version is 6
1468 * - MLD has always Router Alert hop-by-hop option
1469 * - But we do not support jumbrograms.
1470 */
1471 if (ip6h->version != 6 ||
1472 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1473 ip6h->payload_len == 0)
1474 return 0;
1475
1476 len = ntohs(ip6h->payload_len);
1477 if (skb->len < len)
1478 return -EINVAL;
1479
1480 nexthdr = ip6h->nexthdr;
1481 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
1482
1483 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1484 return 0;
1485
1486 /* Okay, we found ICMPv6 header */
1487 skb2 = skb_clone(skb, GFP_ATOMIC);
1488 if (!skb2)
1489 return -ENOMEM;
1490
1491 len -= offset - skb_network_offset(skb2);
1492
1493 __skb_pull(skb2, offset);
1494 skb_reset_transport_header(skb2);
1495
1496 err = -EINVAL;
1497 if (!pskb_may_pull(skb2, sizeof(*icmp6h)))
1498 goto out;
1499
1500 icmp6h = icmp6_hdr(skb2);
1501
1502 switch (icmp6h->icmp6_type) {
1503 case ICMPV6_MGM_QUERY:
1504 case ICMPV6_MGM_REPORT:
1505 case ICMPV6_MGM_REDUCTION:
1506 case ICMPV6_MLD2_REPORT:
1507 break;
1508 default:
1509 err = 0;
1510 goto out;
1511 }
1512
1513 /* Okay, we found MLD message. Check further. */
1514 if (skb2->len > len) {
1515 err = pskb_trim_rcsum(skb2, len);
1516 if (err)
1517 goto out;
1518 }
1519
1520 switch (skb2->ip_summed) {
1521 case CHECKSUM_COMPLETE:
1522 if (!csum_fold(skb2->csum))
1523 break;
1524 /*FALLTHROUGH*/
1525 case CHECKSUM_NONE:
1526 skb2->csum = 0;
1527 if (skb_checksum_complete(skb2))
1528 goto out;
1529 }
1530
1531 err = 0;
1532
1533 BR_INPUT_SKB_CB(skb)->igmp = 1;
1534
1535 switch (icmp6h->icmp6_type) {
1536 case ICMPV6_MGM_REPORT:
1537 {
1538 struct mld_msg *mld = (struct mld_msg *)icmp6h;
1539 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1540 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1541 break;
1542 }
1543 case ICMPV6_MLD2_REPORT:
1544 err = br_ip6_multicast_mld2_report(br, port, skb2);
1545 break;
1546 case ICMPV6_MGM_QUERY:
1547 err = br_ip6_multicast_query(br, port, skb2);
1548 break;
1549 case ICMPV6_MGM_REDUCTION:
1550 {
1551 struct mld_msg *mld = (struct mld_msg *)icmp6h;
1552 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1553 }
1554 }
1555
1556 out:
1557 __skb_push(skb2, offset);
1558 if (skb2 != skb)
1559 kfree_skb(skb2);
1560 return err;
1561 }
1562 #endif
1563
1564 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1565 struct sk_buff *skb)
1566 {
1567 BR_INPUT_SKB_CB(skb)->igmp = 0;
1568 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1569
1570 if (br->multicast_disabled)
1571 return 0;
1572
1573 switch (skb->protocol) {
1574 case htons(ETH_P_IP):
1575 return br_multicast_ipv4_rcv(br, port, skb);
1576 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1577 case htons(ETH_P_IPV6):
1578 return br_multicast_ipv6_rcv(br, port, skb);
1579 #endif
1580 }
1581
1582 return 0;
1583 }
1584
1585 static void br_multicast_query_expired(unsigned long data)
1586 {
1587 struct net_bridge *br = (void *)data;
1588
1589 spin_lock(&br->multicast_lock);
1590 if (br->multicast_startup_queries_sent <
1591 br->multicast_startup_query_count)
1592 br->multicast_startup_queries_sent++;
1593
1594 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1595
1596 spin_unlock(&br->multicast_lock);
1597 }
1598
1599 void br_multicast_init(struct net_bridge *br)
1600 {
1601 br->hash_elasticity = 4;
1602 br->hash_max = 512;
1603
1604 br->multicast_router = 1;
1605 br->multicast_last_member_count = 2;
1606 br->multicast_startup_query_count = 2;
1607
1608 br->multicast_last_member_interval = HZ;
1609 br->multicast_query_response_interval = 10 * HZ;
1610 br->multicast_startup_query_interval = 125 * HZ / 4;
1611 br->multicast_query_interval = 125 * HZ;
1612 br->multicast_querier_interval = 255 * HZ;
1613 br->multicast_membership_interval = 260 * HZ;
1614
1615 spin_lock_init(&br->multicast_lock);
1616 setup_timer(&br->multicast_router_timer,
1617 br_multicast_local_router_expired, 0);
1618 setup_timer(&br->multicast_querier_timer,
1619 br_multicast_local_router_expired, 0);
1620 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1621 (unsigned long)br);
1622 }
1623
1624 void br_multicast_open(struct net_bridge *br)
1625 {
1626 br->multicast_startup_queries_sent = 0;
1627
1628 if (br->multicast_disabled)
1629 return;
1630
1631 mod_timer(&br->multicast_query_timer, jiffies);
1632 }
1633
1634 void br_multicast_stop(struct net_bridge *br)
1635 {
1636 struct net_bridge_mdb_htable *mdb;
1637 struct net_bridge_mdb_entry *mp;
1638 struct hlist_node *p, *n;
1639 u32 ver;
1640 int i;
1641
1642 del_timer_sync(&br->multicast_router_timer);
1643 del_timer_sync(&br->multicast_querier_timer);
1644 del_timer_sync(&br->multicast_query_timer);
1645
1646 spin_lock_bh(&br->multicast_lock);
1647 mdb = mlock_dereference(br->mdb, br);
1648 if (!mdb)
1649 goto out;
1650
1651 br->mdb = NULL;
1652
1653 ver = mdb->ver;
1654 for (i = 0; i < mdb->max; i++) {
1655 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1656 hlist[ver]) {
1657 del_timer(&mp->timer);
1658 del_timer(&mp->query_timer);
1659 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1660 }
1661 }
1662
1663 if (mdb->old) {
1664 spin_unlock_bh(&br->multicast_lock);
1665 rcu_barrier_bh();
1666 spin_lock_bh(&br->multicast_lock);
1667 WARN_ON(mdb->old);
1668 }
1669
1670 mdb->old = mdb;
1671 call_rcu_bh(&mdb->rcu, br_mdb_free);
1672
1673 out:
1674 spin_unlock_bh(&br->multicast_lock);
1675 }
1676
1677 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1678 {
1679 int err = -ENOENT;
1680
1681 spin_lock_bh(&br->multicast_lock);
1682 if (!netif_running(br->dev))
1683 goto unlock;
1684
1685 switch (val) {
1686 case 0:
1687 case 2:
1688 del_timer(&br->multicast_router_timer);
1689 /* fall through */
1690 case 1:
1691 br->multicast_router = val;
1692 err = 0;
1693 break;
1694
1695 default:
1696 err = -EINVAL;
1697 break;
1698 }
1699
1700 unlock:
1701 spin_unlock_bh(&br->multicast_lock);
1702
1703 return err;
1704 }
1705
1706 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1707 {
1708 struct net_bridge *br = p->br;
1709 int err = -ENOENT;
1710
1711 spin_lock(&br->multicast_lock);
1712 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1713 goto unlock;
1714
1715 switch (val) {
1716 case 0:
1717 case 1:
1718 case 2:
1719 p->multicast_router = val;
1720 err = 0;
1721
1722 if (val < 2 && !hlist_unhashed(&p->rlist))
1723 hlist_del_init_rcu(&p->rlist);
1724
1725 if (val == 1)
1726 break;
1727
1728 del_timer(&p->multicast_router_timer);
1729
1730 if (val == 0)
1731 break;
1732
1733 br_multicast_add_router(br, p);
1734 break;
1735
1736 default:
1737 err = -EINVAL;
1738 break;
1739 }
1740
1741 unlock:
1742 spin_unlock(&br->multicast_lock);
1743
1744 return err;
1745 }
1746
1747 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1748 {
1749 struct net_bridge_port *port;
1750 int err = 0;
1751 struct net_bridge_mdb_htable *mdb;
1752
1753 spin_lock(&br->multicast_lock);
1754 if (br->multicast_disabled == !val)
1755 goto unlock;
1756
1757 br->multicast_disabled = !val;
1758 if (br->multicast_disabled)
1759 goto unlock;
1760
1761 if (!netif_running(br->dev))
1762 goto unlock;
1763
1764 mdb = mlock_dereference(br->mdb, br);
1765 if (mdb) {
1766 if (mdb->old) {
1767 err = -EEXIST;
1768 rollback:
1769 br->multicast_disabled = !!val;
1770 goto unlock;
1771 }
1772
1773 err = br_mdb_rehash(&br->mdb, mdb->max,
1774 br->hash_elasticity);
1775 if (err)
1776 goto rollback;
1777 }
1778
1779 br_multicast_open(br);
1780 list_for_each_entry(port, &br->port_list, list) {
1781 if (port->state == BR_STATE_DISABLED ||
1782 port->state == BR_STATE_BLOCKING)
1783 continue;
1784
1785 __br_multicast_enable_port(port);
1786 }
1787
1788 unlock:
1789 spin_unlock(&br->multicast_lock);
1790
1791 return err;
1792 }
1793
1794 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1795 {
1796 int err = -ENOENT;
1797 u32 old;
1798 struct net_bridge_mdb_htable *mdb;
1799
1800 spin_lock(&br->multicast_lock);
1801 if (!netif_running(br->dev))
1802 goto unlock;
1803
1804 err = -EINVAL;
1805 if (!is_power_of_2(val))
1806 goto unlock;
1807
1808 mdb = mlock_dereference(br->mdb, br);
1809 if (mdb && val < mdb->size)
1810 goto unlock;
1811
1812 err = 0;
1813
1814 old = br->hash_max;
1815 br->hash_max = val;
1816
1817 if (mdb) {
1818 if (mdb->old) {
1819 err = -EEXIST;
1820 rollback:
1821 br->hash_max = old;
1822 goto unlock;
1823 }
1824
1825 err = br_mdb_rehash(&br->mdb, br->hash_max,
1826 br->hash_elasticity);
1827 if (err)
1828 goto rollback;
1829 }
1830
1831 unlock:
1832 spin_unlock(&br->multicast_lock);
1833
1834 return err;
1835 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree