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bridge: multicast router list manipulation
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / bridge / br_multicast.c
blobfcba313f18944437055f11d25af4fcd3dfb460e0
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 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
37 static inline int ipv6_is_local_multicast(const struct in6_addr *addr)
38 {
39 if (ipv6_addr_is_multicast(addr) &&
40 IPV6_ADDR_MC_SCOPE(addr) <= IPV6_ADDR_SCOPE_LINKLOCAL)
41 return 1;
42 return 0;
43 }
44 #endif
45
46 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
47 {
48 if (a->proto != b->proto)
49 return 0;
50 switch (a->proto) {
51 case htons(ETH_P_IP):
52 return a->u.ip4 == b->u.ip4;
53 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
54 case htons(ETH_P_IPV6):
55 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
56 #endif
57 }
58 return 0;
59 }
60
61 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
62 {
63 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
64 }
65
66 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
67 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
68 const struct in6_addr *ip)
69 {
70 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
71 }
72 #endif
73
74 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
75 struct br_ip *ip)
76 {
77 switch (ip->proto) {
78 case htons(ETH_P_IP):
79 return __br_ip4_hash(mdb, ip->u.ip4);
80 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
81 case htons(ETH_P_IPV6):
82 return __br_ip6_hash(mdb, &ip->u.ip6);
83 #endif
84 }
85 return 0;
86 }
87
88 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
89 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
90 {
91 struct net_bridge_mdb_entry *mp;
92 struct hlist_node *p;
93
94 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
95 if (br_ip_equal(&mp->addr, dst))
96 return mp;
97 }
98
99 return NULL;
100 }
101
102 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
103 struct net_bridge_mdb_htable *mdb, __be32 dst)
104 {
105 struct br_ip br_dst;
106
107 br_dst.u.ip4 = dst;
108 br_dst.proto = htons(ETH_P_IP);
109
110 return __br_mdb_ip_get(mdb, &br_dst, __br_ip4_hash(mdb, dst));
111 }
112
113 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
114 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
115 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
116 {
117 struct br_ip br_dst;
118
119 ipv6_addr_copy(&br_dst.u.ip6, dst);
120 br_dst.proto = htons(ETH_P_IPV6);
121
122 return __br_mdb_ip_get(mdb, &br_dst, __br_ip6_hash(mdb, dst));
123 }
124 #endif
125
126 static struct net_bridge_mdb_entry *br_mdb_ip_get(
127 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
128 {
129 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
130 }
131
132 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
133 struct sk_buff *skb)
134 {
135 struct net_bridge_mdb_htable *mdb = br->mdb;
136 struct br_ip ip;
137
138 if (!mdb || br->multicast_disabled)
139 return NULL;
140
141 if (BR_INPUT_SKB_CB(skb)->igmp)
142 return NULL;
143
144 ip.proto = skb->protocol;
145
146 switch (skb->protocol) {
147 case htons(ETH_P_IP):
148 ip.u.ip4 = ip_hdr(skb)->daddr;
149 break;
150 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
151 case htons(ETH_P_IPV6):
152 ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr);
153 break;
154 #endif
155 default:
156 return NULL;
157 }
158
159 return br_mdb_ip_get(mdb, &ip);
160 }
161
162 static void br_mdb_free(struct rcu_head *head)
163 {
164 struct net_bridge_mdb_htable *mdb =
165 container_of(head, struct net_bridge_mdb_htable, rcu);
166 struct net_bridge_mdb_htable *old = mdb->old;
167
168 mdb->old = NULL;
169 kfree(old->mhash);
170 kfree(old);
171 }
172
173 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
174 struct net_bridge_mdb_htable *old,
175 int elasticity)
176 {
177 struct net_bridge_mdb_entry *mp;
178 struct hlist_node *p;
179 int maxlen;
180 int len;
181 int i;
182
183 for (i = 0; i < old->max; i++)
184 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
185 hlist_add_head(&mp->hlist[new->ver],
186 &new->mhash[br_ip_hash(new, &mp->addr)]);
187
188 if (!elasticity)
189 return 0;
190
191 maxlen = 0;
192 for (i = 0; i < new->max; i++) {
193 len = 0;
194 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
195 len++;
196 if (len > maxlen)
197 maxlen = len;
198 }
199
200 return maxlen > elasticity ? -EINVAL : 0;
201 }
202
203 static void br_multicast_free_pg(struct rcu_head *head)
204 {
205 struct net_bridge_port_group *p =
206 container_of(head, struct net_bridge_port_group, rcu);
207
208 kfree(p);
209 }
210
211 static void br_multicast_free_group(struct rcu_head *head)
212 {
213 struct net_bridge_mdb_entry *mp =
214 container_of(head, struct net_bridge_mdb_entry, rcu);
215
216 kfree(mp);
217 }
218
219 static void br_multicast_group_expired(unsigned long data)
220 {
221 struct net_bridge_mdb_entry *mp = (void *)data;
222 struct net_bridge *br = mp->br;
223 struct net_bridge_mdb_htable *mdb;
224
225 spin_lock(&br->multicast_lock);
226 if (!netif_running(br->dev) || timer_pending(&mp->timer))
227 goto out;
228
229 if (!hlist_unhashed(&mp->mglist))
230 hlist_del_init(&mp->mglist);
231
232 if (mp->ports)
233 goto out;
234
235 mdb = br->mdb;
236 hlist_del_rcu(&mp->hlist[mdb->ver]);
237 mdb->size--;
238
239 del_timer(&mp->query_timer);
240 call_rcu_bh(&mp->rcu, br_multicast_free_group);
241
242 out:
243 spin_unlock(&br->multicast_lock);
244 }
245
246 static void br_multicast_del_pg(struct net_bridge *br,
247 struct net_bridge_port_group *pg)
248 {
249 struct net_bridge_mdb_htable *mdb = br->mdb;
250 struct net_bridge_mdb_entry *mp;
251 struct net_bridge_port_group *p;
252 struct net_bridge_port_group **pp;
253
254 mp = br_mdb_ip_get(mdb, &pg->addr);
255 if (WARN_ON(!mp))
256 return;
257
258 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
259 if (p != pg)
260 continue;
261
262 *pp = p->next;
263 hlist_del_init(&p->mglist);
264 del_timer(&p->timer);
265 del_timer(&p->query_timer);
266 call_rcu_bh(&p->rcu, br_multicast_free_pg);
267
268 if (!mp->ports && hlist_unhashed(&mp->mglist) &&
269 netif_running(br->dev))
270 mod_timer(&mp->timer, jiffies);
271
272 return;
273 }
274
275 WARN_ON(1);
276 }
277
278 static void br_multicast_port_group_expired(unsigned long data)
279 {
280 struct net_bridge_port_group *pg = (void *)data;
281 struct net_bridge *br = pg->port->br;
282
283 spin_lock(&br->multicast_lock);
284 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
285 hlist_unhashed(&pg->mglist))
286 goto out;
287
288 br_multicast_del_pg(br, pg);
289
290 out:
291 spin_unlock(&br->multicast_lock);
292 }
293
294 static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max,
295 int elasticity)
296 {
297 struct net_bridge_mdb_htable *old = *mdbp;
298 struct net_bridge_mdb_htable *mdb;
299 int err;
300
301 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
302 if (!mdb)
303 return -ENOMEM;
304
305 mdb->max = max;
306 mdb->old = old;
307
308 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
309 if (!mdb->mhash) {
310 kfree(mdb);
311 return -ENOMEM;
312 }
313
314 mdb->size = old ? old->size : 0;
315 mdb->ver = old ? old->ver ^ 1 : 0;
316
317 if (!old || elasticity)
318 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
319 else
320 mdb->secret = old->secret;
321
322 if (!old)
323 goto out;
324
325 err = br_mdb_copy(mdb, old, elasticity);
326 if (err) {
327 kfree(mdb->mhash);
328 kfree(mdb);
329 return err;
330 }
331
332 call_rcu_bh(&mdb->rcu, br_mdb_free);
333
334 out:
335 rcu_assign_pointer(*mdbp, mdb);
336
337 return 0;
338 }
339
340 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
341 __be32 group)
342 {
343 struct sk_buff *skb;
344 struct igmphdr *ih;
345 struct ethhdr *eth;
346 struct iphdr *iph;
347
348 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
349 sizeof(*ih) + 4);
350 if (!skb)
351 goto out;
352
353 skb->protocol = htons(ETH_P_IP);
354
355 skb_reset_mac_header(skb);
356 eth = eth_hdr(skb);
357
358 memcpy(eth->h_source, br->dev->dev_addr, 6);
359 eth->h_dest[0] = 1;
360 eth->h_dest[1] = 0;
361 eth->h_dest[2] = 0x5e;
362 eth->h_dest[3] = 0;
363 eth->h_dest[4] = 0;
364 eth->h_dest[5] = 1;
365 eth->h_proto = htons(ETH_P_IP);
366 skb_put(skb, sizeof(*eth));
367
368 skb_set_network_header(skb, skb->len);
369 iph = ip_hdr(skb);
370
371 iph->version = 4;
372 iph->ihl = 6;
373 iph->tos = 0xc0;
374 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
375 iph->id = 0;
376 iph->frag_off = htons(IP_DF);
377 iph->ttl = 1;
378 iph->protocol = IPPROTO_IGMP;
379 iph->saddr = 0;
380 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
381 ((u8 *)&iph[1])[0] = IPOPT_RA;
382 ((u8 *)&iph[1])[1] = 4;
383 ((u8 *)&iph[1])[2] = 0;
384 ((u8 *)&iph[1])[3] = 0;
385 ip_send_check(iph);
386 skb_put(skb, 24);
387
388 skb_set_transport_header(skb, skb->len);
389 ih = igmp_hdr(skb);
390 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
391 ih->code = (group ? br->multicast_last_member_interval :
392 br->multicast_query_response_interval) /
393 (HZ / IGMP_TIMER_SCALE);
394 ih->group = group;
395 ih->csum = 0;
396 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
397 skb_put(skb, sizeof(*ih));
398
399 __skb_pull(skb, sizeof(*eth));
400
401 out:
402 return skb;
403 }
404
405 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
406 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
407 struct in6_addr *group)
408 {
409 struct sk_buff *skb;
410 struct ipv6hdr *ip6h;
411 struct mld_msg *mldq;
412 struct ethhdr *eth;
413 u8 *hopopt;
414 unsigned long interval;
415
416 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
417 8 + sizeof(*mldq));
418 if (!skb)
419 goto out;
420
421 skb->protocol = htons(ETH_P_IPV6);
422
423 /* Ethernet header */
424 skb_reset_mac_header(skb);
425 eth = eth_hdr(skb);
426
427 memcpy(eth->h_source, br->dev->dev_addr, 6);
428 ipv6_eth_mc_map(group, eth->h_dest);
429 eth->h_proto = htons(ETH_P_IPV6);
430 skb_put(skb, sizeof(*eth));
431
432 /* IPv6 header + HbH option */
433 skb_set_network_header(skb, skb->len);
434 ip6h = ipv6_hdr(skb);
435
436 *(__force __be32 *)ip6h = htonl(0x60000000);
437 ip6h->payload_len = 8 + sizeof(*mldq);
438 ip6h->nexthdr = IPPROTO_HOPOPTS;
439 ip6h->hop_limit = 1;
440 ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0);
441 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
442
443 hopopt = (u8 *)(ip6h + 1);
444 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
445 hopopt[1] = 0; /* length of HbH */
446 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
447 hopopt[3] = 2; /* Length of RA Option */
448 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
449 hopopt[5] = 0;
450 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */
451 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */
452
453 skb_put(skb, sizeof(*ip6h) + 8);
454
455 /* ICMPv6 */
456 skb_set_transport_header(skb, skb->len);
457 mldq = (struct mld_msg *) icmp6_hdr(skb);
458
459 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
460 br->multicast_query_response_interval;
461
462 mldq->mld_type = ICMPV6_MGM_QUERY;
463 mldq->mld_code = 0;
464 mldq->mld_cksum = 0;
465 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
466 mldq->mld_reserved = 0;
467 ipv6_addr_copy(&mldq->mld_mca, group);
468
469 /* checksum */
470 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
471 sizeof(*mldq), IPPROTO_ICMPV6,
472 csum_partial(mldq,
473 sizeof(*mldq), 0));
474 skb_put(skb, sizeof(*mldq));
475
476 __skb_pull(skb, sizeof(*eth));
477
478 out:
479 return skb;
480 }
481 #endif
482
483 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
484 struct br_ip *addr)
485 {
486 switch (addr->proto) {
487 case htons(ETH_P_IP):
488 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
489 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
490 case htons(ETH_P_IPV6):
491 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
492 #endif
493 }
494 return NULL;
495 }
496
497 static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
498 {
499 struct net_bridge *br = mp->br;
500 struct sk_buff *skb;
501
502 skb = br_multicast_alloc_query(br, &mp->addr);
503 if (!skb)
504 goto timer;
505
506 netif_rx(skb);
507
508 timer:
509 if (++mp->queries_sent < br->multicast_last_member_count)
510 mod_timer(&mp->query_timer,
511 jiffies + br->multicast_last_member_interval);
512 }
513
514 static void br_multicast_group_query_expired(unsigned long data)
515 {
516 struct net_bridge_mdb_entry *mp = (void *)data;
517 struct net_bridge *br = mp->br;
518
519 spin_lock(&br->multicast_lock);
520 if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
521 mp->queries_sent >= br->multicast_last_member_count)
522 goto out;
523
524 br_multicast_send_group_query(mp);
525
526 out:
527 spin_unlock(&br->multicast_lock);
528 }
529
530 static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
531 {
532 struct net_bridge_port *port = pg->port;
533 struct net_bridge *br = port->br;
534 struct sk_buff *skb;
535
536 skb = br_multicast_alloc_query(br, &pg->addr);
537 if (!skb)
538 goto timer;
539
540 br_deliver(port, skb);
541
542 timer:
543 if (++pg->queries_sent < br->multicast_last_member_count)
544 mod_timer(&pg->query_timer,
545 jiffies + br->multicast_last_member_interval);
546 }
547
548 static void br_multicast_port_group_query_expired(unsigned long data)
549 {
550 struct net_bridge_port_group *pg = (void *)data;
551 struct net_bridge_port *port = pg->port;
552 struct net_bridge *br = port->br;
553
554 spin_lock(&br->multicast_lock);
555 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
556 pg->queries_sent >= br->multicast_last_member_count)
557 goto out;
558
559 br_multicast_send_port_group_query(pg);
560
561 out:
562 spin_unlock(&br->multicast_lock);
563 }
564
565 static struct net_bridge_mdb_entry *br_multicast_get_group(
566 struct net_bridge *br, struct net_bridge_port *port,
567 struct br_ip *group, int hash)
568 {
569 struct net_bridge_mdb_htable *mdb = br->mdb;
570 struct net_bridge_mdb_entry *mp;
571 struct hlist_node *p;
572 unsigned count = 0;
573 unsigned max;
574 int elasticity;
575 int err;
576
577 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
578 count++;
579 if (unlikely(br_ip_equal(group, &mp->addr)))
580 return mp;
581 }
582
583 elasticity = 0;
584 max = mdb->max;
585
586 if (unlikely(count > br->hash_elasticity && count)) {
587 if (net_ratelimit())
588 printk(KERN_INFO "%s: Multicast hash table "
589 "chain limit reached: %s\n",
590 br->dev->name, port ? port->dev->name :
591 br->dev->name);
592
593 elasticity = br->hash_elasticity;
594 }
595
596 if (mdb->size >= max) {
597 max *= 2;
598 if (unlikely(max >= br->hash_max)) {
599 printk(KERN_WARNING "%s: Multicast hash table maximum "
600 "reached, disabling snooping: %s, %d\n",
601 br->dev->name, port ? port->dev->name :
602 br->dev->name,
603 max);
604 err = -E2BIG;
605 disable:
606 br->multicast_disabled = 1;
607 goto err;
608 }
609 }
610
611 if (max > mdb->max || elasticity) {
612 if (mdb->old) {
613 if (net_ratelimit())
614 printk(KERN_INFO "%s: Multicast hash table "
615 "on fire: %s\n",
616 br->dev->name, port ? port->dev->name :
617 br->dev->name);
618 err = -EEXIST;
619 goto err;
620 }
621
622 err = br_mdb_rehash(&br->mdb, max, elasticity);
623 if (err) {
624 printk(KERN_WARNING "%s: Cannot rehash multicast "
625 "hash table, disabling snooping: "
626 "%s, %d, %d\n",
627 br->dev->name, port ? port->dev->name :
628 br->dev->name,
629 mdb->size, err);
630 goto disable;
631 }
632
633 err = -EAGAIN;
634 goto err;
635 }
636
637 return NULL;
638
639 err:
640 mp = ERR_PTR(err);
641 return mp;
642 }
643
644 static struct net_bridge_mdb_entry *br_multicast_new_group(
645 struct net_bridge *br, struct net_bridge_port *port,
646 struct br_ip *group)
647 {
648 struct net_bridge_mdb_htable *mdb = br->mdb;
649 struct net_bridge_mdb_entry *mp;
650 int hash;
651
652 if (!mdb) {
653 if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0))
654 return NULL;
655 goto rehash;
656 }
657
658 hash = br_ip_hash(mdb, group);
659 mp = br_multicast_get_group(br, port, group, hash);
660 switch (PTR_ERR(mp)) {
661 case 0:
662 break;
663
664 case -EAGAIN:
665 rehash:
666 mdb = br->mdb;
667 hash = br_ip_hash(mdb, group);
668 break;
669
670 default:
671 goto out;
672 }
673
674 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
675 if (unlikely(!mp))
676 goto out;
677
678 mp->br = br;
679 mp->addr = *group;
680 setup_timer(&mp->timer, br_multicast_group_expired,
681 (unsigned long)mp);
682 setup_timer(&mp->query_timer, br_multicast_group_query_expired,
683 (unsigned long)mp);
684
685 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
686 mdb->size++;
687
688 out:
689 return mp;
690 }
691
692 static int br_multicast_add_group(struct net_bridge *br,
693 struct net_bridge_port *port,
694 struct br_ip *group)
695 {
696 struct net_bridge_mdb_entry *mp;
697 struct net_bridge_port_group *p;
698 struct net_bridge_port_group **pp;
699 unsigned long now = jiffies;
700 int err;
701
702 spin_lock(&br->multicast_lock);
703 if (!netif_running(br->dev) ||
704 (port && port->state == BR_STATE_DISABLED))
705 goto out;
706
707 mp = br_multicast_new_group(br, port, group);
708 err = PTR_ERR(mp);
709 if (unlikely(IS_ERR(mp) || !mp))
710 goto err;
711
712 if (!port) {
713 hlist_add_head(&mp->mglist, &br->mglist);
714 mod_timer(&mp->timer, now + br->multicast_membership_interval);
715 goto out;
716 }
717
718 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
719 if (p->port == port)
720 goto found;
721 if ((unsigned long)p->port < (unsigned long)port)
722 break;
723 }
724
725 p = kzalloc(sizeof(*p), GFP_ATOMIC);
726 err = -ENOMEM;
727 if (unlikely(!p))
728 goto err;
729
730 p->addr = *group;
731 p->port = port;
732 p->next = *pp;
733 hlist_add_head(&p->mglist, &port->mglist);
734 setup_timer(&p->timer, br_multicast_port_group_expired,
735 (unsigned long)p);
736 setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
737 (unsigned long)p);
738
739 rcu_assign_pointer(*pp, p);
740
741 found:
742 mod_timer(&p->timer, now + br->multicast_membership_interval);
743 out:
744 err = 0;
745
746 err:
747 spin_unlock(&br->multicast_lock);
748 return err;
749 }
750
751 static int br_ip4_multicast_add_group(struct net_bridge *br,
752 struct net_bridge_port *port,
753 __be32 group)
754 {
755 struct br_ip br_group;
756
757 if (ipv4_is_local_multicast(group))
758 return 0;
759
760 br_group.u.ip4 = group;
761 br_group.proto = htons(ETH_P_IP);
762
763 return br_multicast_add_group(br, port, &br_group);
764 }
765
766 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
767 static int br_ip6_multicast_add_group(struct net_bridge *br,
768 struct net_bridge_port *port,
769 const struct in6_addr *group)
770 {
771 struct br_ip br_group;
772
773 if (ipv6_is_local_multicast(group))
774 return 0;
775
776 ipv6_addr_copy(&br_group.u.ip6, group);
777 br_group.proto = htons(ETH_P_IP);
778
779 return br_multicast_add_group(br, port, &br_group);
780 }
781 #endif
782
783 static void br_multicast_router_expired(unsigned long data)
784 {
785 struct net_bridge_port *port = (void *)data;
786 struct net_bridge *br = port->br;
787
788 spin_lock(&br->multicast_lock);
789 if (port->multicast_router != 1 ||
790 timer_pending(&port->multicast_router_timer) ||
791 hlist_unhashed(&port->rlist))
792 goto out;
793
794 hlist_del_init_rcu(&port->rlist);
795
796 out:
797 spin_unlock(&br->multicast_lock);
798 }
799
800 static void br_multicast_local_router_expired(unsigned long data)
801 {
802 }
803
804 static void __br_multicast_send_query(struct net_bridge *br,
805 struct net_bridge_port *port,
806 struct br_ip *ip)
807 {
808 struct sk_buff *skb;
809
810 skb = br_multicast_alloc_query(br, ip);
811 if (!skb)
812 return;
813
814 if (port) {
815 __skb_push(skb, sizeof(struct ethhdr));
816 skb->dev = port->dev;
817 NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
818 dev_queue_xmit);
819 } else
820 netif_rx(skb);
821 }
822
823 static void br_multicast_send_query(struct net_bridge *br,
824 struct net_bridge_port *port, u32 sent)
825 {
826 unsigned long time;
827 struct br_ip br_group;
828
829 if (!netif_running(br->dev) || br->multicast_disabled ||
830 timer_pending(&br->multicast_querier_timer))
831 return;
832
833 memset(&br_group.u, 0, sizeof(br_group.u));
834
835 br_group.proto = htons(ETH_P_IP);
836 __br_multicast_send_query(br, port, &br_group);
837
838 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
839 br_group.proto = htons(ETH_P_IPV6);
840 __br_multicast_send_query(br, port, &br_group);
841 #endif
842
843 time = jiffies;
844 time += sent < br->multicast_startup_query_count ?
845 br->multicast_startup_query_interval :
846 br->multicast_query_interval;
847 mod_timer(port ? &port->multicast_query_timer :
848 &br->multicast_query_timer, time);
849 }
850
851 static void br_multicast_port_query_expired(unsigned long data)
852 {
853 struct net_bridge_port *port = (void *)data;
854 struct net_bridge *br = port->br;
855
856 spin_lock(&br->multicast_lock);
857 if (port->state == BR_STATE_DISABLED ||
858 port->state == BR_STATE_BLOCKING)
859 goto out;
860
861 if (port->multicast_startup_queries_sent <
862 br->multicast_startup_query_count)
863 port->multicast_startup_queries_sent++;
864
865 br_multicast_send_query(port->br, port,
866 port->multicast_startup_queries_sent);
867
868 out:
869 spin_unlock(&br->multicast_lock);
870 }
871
872 void br_multicast_add_port(struct net_bridge_port *port)
873 {
874 port->multicast_router = 1;
875
876 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
877 (unsigned long)port);
878 setup_timer(&port->multicast_query_timer,
879 br_multicast_port_query_expired, (unsigned long)port);
880 }
881
882 void br_multicast_del_port(struct net_bridge_port *port)
883 {
884 del_timer_sync(&port->multicast_router_timer);
885 }
886
887 static void __br_multicast_enable_port(struct net_bridge_port *port)
888 {
889 port->multicast_startup_queries_sent = 0;
890
891 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
892 del_timer(&port->multicast_query_timer))
893 mod_timer(&port->multicast_query_timer, jiffies);
894 }
895
896 void br_multicast_enable_port(struct net_bridge_port *port)
897 {
898 struct net_bridge *br = port->br;
899
900 spin_lock(&br->multicast_lock);
901 if (br->multicast_disabled || !netif_running(br->dev))
902 goto out;
903
904 __br_multicast_enable_port(port);
905
906 out:
907 spin_unlock(&br->multicast_lock);
908 }
909
910 void br_multicast_disable_port(struct net_bridge_port *port)
911 {
912 struct net_bridge *br = port->br;
913 struct net_bridge_port_group *pg;
914 struct hlist_node *p, *n;
915
916 spin_lock(&br->multicast_lock);
917 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
918 br_multicast_del_pg(br, pg);
919
920 if (!hlist_unhashed(&port->rlist))
921 hlist_del_init_rcu(&port->rlist);
922 del_timer(&port->multicast_router_timer);
923 del_timer(&port->multicast_query_timer);
924 spin_unlock(&br->multicast_lock);
925 }
926
927 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
928 struct net_bridge_port *port,
929 struct sk_buff *skb)
930 {
931 struct igmpv3_report *ih;
932 struct igmpv3_grec *grec;
933 int i;
934 int len;
935 int num;
936 int type;
937 int err = 0;
938 __be32 group;
939
940 if (!pskb_may_pull(skb, sizeof(*ih)))
941 return -EINVAL;
942
943 ih = igmpv3_report_hdr(skb);
944 num = ntohs(ih->ngrec);
945 len = sizeof(*ih);
946
947 for (i = 0; i < num; i++) {
948 len += sizeof(*grec);
949 if (!pskb_may_pull(skb, len))
950 return -EINVAL;
951
952 grec = (void *)(skb->data + len - sizeof(*grec));
953 group = grec->grec_mca;
954 type = grec->grec_type;
955
956 len += ntohs(grec->grec_nsrcs) * 4;
957 if (!pskb_may_pull(skb, len))
958 return -EINVAL;
959
960 /* We treat this as an IGMPv2 report for now. */
961 switch (type) {
962 case IGMPV3_MODE_IS_INCLUDE:
963 case IGMPV3_MODE_IS_EXCLUDE:
964 case IGMPV3_CHANGE_TO_INCLUDE:
965 case IGMPV3_CHANGE_TO_EXCLUDE:
966 case IGMPV3_ALLOW_NEW_SOURCES:
967 case IGMPV3_BLOCK_OLD_SOURCES:
968 break;
969
970 default:
971 continue;
972 }
973
974 err = br_ip4_multicast_add_group(br, port, group);
975 if (err)
976 break;
977 }
978
979 return err;
980 }
981
982 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
983 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
984 struct net_bridge_port *port,
985 struct sk_buff *skb)
986 {
987 struct icmp6hdr *icmp6h;
988 struct mld2_grec *grec;
989 int i;
990 int len;
991 int num;
992 int err = 0;
993
994 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
995 return -EINVAL;
996
997 icmp6h = icmp6_hdr(skb);
998 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
999 len = sizeof(*icmp6h);
1000
1001 for (i = 0; i < num; i++) {
1002 __be16 *nsrcs, _nsrcs;
1003
1004 nsrcs = skb_header_pointer(skb,
1005 len + offsetof(struct mld2_grec,
1006 grec_mca),
1007 sizeof(_nsrcs), &_nsrcs);
1008 if (!nsrcs)
1009 return -EINVAL;
1010
1011 if (!pskb_may_pull(skb,
1012 len + sizeof(*grec) +
1013 sizeof(struct in6_addr) * (*nsrcs)))
1014 return -EINVAL;
1015
1016 grec = (struct mld2_grec *)(skb->data + len);
1017 len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs);
1018
1019 /* We treat these as MLDv1 reports for now. */
1020 switch (grec->grec_type) {
1021 case MLD2_MODE_IS_INCLUDE:
1022 case MLD2_MODE_IS_EXCLUDE:
1023 case MLD2_CHANGE_TO_INCLUDE:
1024 case MLD2_CHANGE_TO_EXCLUDE:
1025 case MLD2_ALLOW_NEW_SOURCES:
1026 case MLD2_BLOCK_OLD_SOURCES:
1027 break;
1028
1029 default:
1030 continue;
1031 }
1032
1033 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
1034 if (!err)
1035 break;
1036 }
1037
1038 return err;
1039 }
1040 #endif
1041
1042 static void br_multicast_add_router(struct net_bridge *br,
1043 struct net_bridge_port *port)
1044 {
1045 struct net_bridge_port *p;
1046 struct hlist_node *n, *last = NULL;
1047
1048 hlist_for_each_entry(p, n, &br->router_list, rlist) {
1049 if ((unsigned long) port >= (unsigned long) p) {
1050 hlist_add_before_rcu(n, &port->rlist);
1051 return;
1052 }
1053 last = n;
1054 }
1055
1056 if (last)
1057 hlist_add_after_rcu(last, &port->rlist);
1058 else
1059 hlist_add_head_rcu(&port->rlist, &br->router_list);
1060 }
1061
1062 static void br_multicast_mark_router(struct net_bridge *br,
1063 struct net_bridge_port *port)
1064 {
1065 unsigned long now = jiffies;
1066
1067 if (!port) {
1068 if (br->multicast_router == 1)
1069 mod_timer(&br->multicast_router_timer,
1070 now + br->multicast_querier_interval);
1071 return;
1072 }
1073
1074 if (port->multicast_router != 1)
1075 return;
1076
1077 if (!hlist_unhashed(&port->rlist))
1078 goto timer;
1079
1080 br_multicast_add_router(br, port);
1081
1082 timer:
1083 mod_timer(&port->multicast_router_timer,
1084 now + br->multicast_querier_interval);
1085 }
1086
1087 static void br_multicast_query_received(struct net_bridge *br,
1088 struct net_bridge_port *port,
1089 int saddr)
1090 {
1091 if (saddr)
1092 mod_timer(&br->multicast_querier_timer,
1093 jiffies + br->multicast_querier_interval);
1094 else if (timer_pending(&br->multicast_querier_timer))
1095 return;
1096
1097 br_multicast_mark_router(br, port);
1098 }
1099
1100 static int br_ip4_multicast_query(struct net_bridge *br,
1101 struct net_bridge_port *port,
1102 struct sk_buff *skb)
1103 {
1104 struct iphdr *iph = ip_hdr(skb);
1105 struct igmphdr *ih = igmp_hdr(skb);
1106 struct net_bridge_mdb_entry *mp;
1107 struct igmpv3_query *ih3;
1108 struct net_bridge_port_group *p;
1109 struct net_bridge_port_group **pp;
1110 unsigned long max_delay;
1111 unsigned long now = jiffies;
1112 __be32 group;
1113 int err = 0;
1114
1115 spin_lock(&br->multicast_lock);
1116 if (!netif_running(br->dev) ||
1117 (port && port->state == BR_STATE_DISABLED))
1118 goto out;
1119
1120 br_multicast_query_received(br, port, !!iph->saddr);
1121
1122 group = ih->group;
1123
1124 if (skb->len == sizeof(*ih)) {
1125 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1126
1127 if (!max_delay) {
1128 max_delay = 10 * HZ;
1129 group = 0;
1130 }
1131 } else {
1132 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1133 err = -EINVAL;
1134 goto out;
1135 }
1136
1137 ih3 = igmpv3_query_hdr(skb);
1138 if (ih3->nsrcs)
1139 goto out;
1140
1141 max_delay = ih3->code ?
1142 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1143 }
1144
1145 if (!group)
1146 goto out;
1147
1148 mp = br_mdb_ip4_get(br->mdb, group);
1149 if (!mp)
1150 goto out;
1151
1152 max_delay *= br->multicast_last_member_count;
1153
1154 if (!hlist_unhashed(&mp->mglist) &&
1155 (timer_pending(&mp->timer) ?
1156 time_after(mp->timer.expires, now + max_delay) :
1157 try_to_del_timer_sync(&mp->timer) >= 0))
1158 mod_timer(&mp->timer, now + max_delay);
1159
1160 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
1161 if (timer_pending(&p->timer) ?
1162 time_after(p->timer.expires, now + max_delay) :
1163 try_to_del_timer_sync(&p->timer) >= 0)
1164 mod_timer(&mp->timer, now + max_delay);
1165 }
1166
1167 out:
1168 spin_unlock(&br->multicast_lock);
1169 return err;
1170 }
1171
1172 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1173 static int br_ip6_multicast_query(struct net_bridge *br,
1174 struct net_bridge_port *port,
1175 struct sk_buff *skb)
1176 {
1177 struct ipv6hdr *ip6h = ipv6_hdr(skb);
1178 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1179 struct net_bridge_mdb_entry *mp;
1180 struct mld2_query *mld2q;
1181 struct net_bridge_port_group *p, **pp;
1182 unsigned long max_delay;
1183 unsigned long now = jiffies;
1184 struct in6_addr *group = NULL;
1185 int err = 0;
1186
1187 spin_lock(&br->multicast_lock);
1188 if (!netif_running(br->dev) ||
1189 (port && port->state == BR_STATE_DISABLED))
1190 goto out;
1191
1192 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1193
1194 if (skb->len == sizeof(*mld)) {
1195 if (!pskb_may_pull(skb, sizeof(*mld))) {
1196 err = -EINVAL;
1197 goto out;
1198 }
1199 mld = (struct mld_msg *) icmp6_hdr(skb);
1200 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
1201 if (max_delay)
1202 group = &mld->mld_mca;
1203 } else if (skb->len >= sizeof(*mld2q)) {
1204 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1205 err = -EINVAL;
1206 goto out;
1207 }
1208 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1209 if (!mld2q->mld2q_nsrcs)
1210 group = &mld2q->mld2q_mca;
1211 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1212 }
1213
1214 if (!group)
1215 goto out;
1216
1217 mp = br_mdb_ip6_get(br->mdb, group);
1218 if (!mp)
1219 goto out;
1220
1221 max_delay *= br->multicast_last_member_count;
1222 if (!hlist_unhashed(&mp->mglist) &&
1223 (timer_pending(&mp->timer) ?
1224 time_after(mp->timer.expires, now + max_delay) :
1225 try_to_del_timer_sync(&mp->timer) >= 0))
1226 mod_timer(&mp->timer, now + max_delay);
1227
1228 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
1229 if (timer_pending(&p->timer) ?
1230 time_after(p->timer.expires, now + max_delay) :
1231 try_to_del_timer_sync(&p->timer) >= 0)
1232 mod_timer(&mp->timer, now + max_delay);
1233 }
1234
1235 out:
1236 spin_unlock(&br->multicast_lock);
1237 return err;
1238 }
1239 #endif
1240
1241 static void br_multicast_leave_group(struct net_bridge *br,
1242 struct net_bridge_port *port,
1243 struct br_ip *group)
1244 {
1245 struct net_bridge_mdb_htable *mdb;
1246 struct net_bridge_mdb_entry *mp;
1247 struct net_bridge_port_group *p;
1248 unsigned long now;
1249 unsigned long time;
1250
1251 spin_lock(&br->multicast_lock);
1252 if (!netif_running(br->dev) ||
1253 (port && port->state == BR_STATE_DISABLED) ||
1254 timer_pending(&br->multicast_querier_timer))
1255 goto out;
1256
1257 mdb = br->mdb;
1258 mp = br_mdb_ip_get(mdb, group);
1259 if (!mp)
1260 goto out;
1261
1262 now = jiffies;
1263 time = now + br->multicast_last_member_count *
1264 br->multicast_last_member_interval;
1265
1266 if (!port) {
1267 if (!hlist_unhashed(&mp->mglist) &&
1268 (timer_pending(&mp->timer) ?
1269 time_after(mp->timer.expires, time) :
1270 try_to_del_timer_sync(&mp->timer) >= 0)) {
1271 mod_timer(&mp->timer, time);
1272
1273 mp->queries_sent = 0;
1274 mod_timer(&mp->query_timer, now);
1275 }
1276
1277 goto out;
1278 }
1279
1280 for (p = mp->ports; p; p = p->next) {
1281 if (p->port != port)
1282 continue;
1283
1284 if (!hlist_unhashed(&p->mglist) &&
1285 (timer_pending(&p->timer) ?
1286 time_after(p->timer.expires, time) :
1287 try_to_del_timer_sync(&p->timer) >= 0)) {
1288 mod_timer(&p->timer, time);
1289
1290 p->queries_sent = 0;
1291 mod_timer(&p->query_timer, now);
1292 }
1293
1294 break;
1295 }
1296
1297 out:
1298 spin_unlock(&br->multicast_lock);
1299 }
1300
1301 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1302 struct net_bridge_port *port,
1303 __be32 group)
1304 {
1305 struct br_ip br_group;
1306
1307 if (ipv4_is_local_multicast(group))
1308 return;
1309
1310 br_group.u.ip4 = group;
1311 br_group.proto = htons(ETH_P_IP);
1312
1313 br_multicast_leave_group(br, port, &br_group);
1314 }
1315
1316 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1317 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1318 struct net_bridge_port *port,
1319 const struct in6_addr *group)
1320 {
1321 struct br_ip br_group;
1322
1323 if (ipv6_is_local_multicast(group))
1324 return;
1325
1326 ipv6_addr_copy(&br_group.u.ip6, group);
1327 br_group.proto = htons(ETH_P_IPV6);
1328
1329 br_multicast_leave_group(br, port, &br_group);
1330 }
1331 #endif
1332
1333 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1334 struct net_bridge_port *port,
1335 struct sk_buff *skb)
1336 {
1337 struct sk_buff *skb2 = skb;
1338 struct iphdr *iph;
1339 struct igmphdr *ih;
1340 unsigned len;
1341 unsigned offset;
1342 int err;
1343
1344 /* We treat OOM as packet loss for now. */
1345 if (!pskb_may_pull(skb, sizeof(*iph)))
1346 return -EINVAL;
1347
1348 iph = ip_hdr(skb);
1349
1350 if (iph->ihl < 5 || iph->version != 4)
1351 return -EINVAL;
1352
1353 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1354 return -EINVAL;
1355
1356 iph = ip_hdr(skb);
1357
1358 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1359 return -EINVAL;
1360
1361 if (iph->protocol != IPPROTO_IGMP)
1362 return 0;
1363
1364 len = ntohs(iph->tot_len);
1365 if (skb->len < len || len < ip_hdrlen(skb))
1366 return -EINVAL;
1367
1368 if (skb->len > len) {
1369 skb2 = skb_clone(skb, GFP_ATOMIC);
1370 if (!skb2)
1371 return -ENOMEM;
1372
1373 err = pskb_trim_rcsum(skb2, len);
1374 if (err)
1375 goto err_out;
1376 }
1377
1378 len -= ip_hdrlen(skb2);
1379 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1380 __skb_pull(skb2, offset);
1381 skb_reset_transport_header(skb2);
1382
1383 err = -EINVAL;
1384 if (!pskb_may_pull(skb2, sizeof(*ih)))
1385 goto out;
1386
1387 switch (skb2->ip_summed) {
1388 case CHECKSUM_COMPLETE:
1389 if (!csum_fold(skb2->csum))
1390 break;
1391 /* fall through */
1392 case CHECKSUM_NONE:
1393 skb2->csum = 0;
1394 if (skb_checksum_complete(skb2))
1395 goto out;
1396 }
1397
1398 err = 0;
1399
1400 BR_INPUT_SKB_CB(skb)->igmp = 1;
1401 ih = igmp_hdr(skb2);
1402
1403 switch (ih->type) {
1404 case IGMP_HOST_MEMBERSHIP_REPORT:
1405 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1406 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1407 err = br_ip4_multicast_add_group(br, port, ih->group);
1408 break;
1409 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1410 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1411 break;
1412 case IGMP_HOST_MEMBERSHIP_QUERY:
1413 err = br_ip4_multicast_query(br, port, skb2);
1414 break;
1415 case IGMP_HOST_LEAVE_MESSAGE:
1416 br_ip4_multicast_leave_group(br, port, ih->group);
1417 break;
1418 }
1419
1420 out:
1421 __skb_push(skb2, offset);
1422 err_out:
1423 if (skb2 != skb)
1424 kfree_skb(skb2);
1425 return err;
1426 }
1427
1428 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1429 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1430 struct net_bridge_port *port,
1431 struct sk_buff *skb)
1432 {
1433 struct sk_buff *skb2 = skb;
1434 struct ipv6hdr *ip6h;
1435 struct icmp6hdr *icmp6h;
1436 u8 nexthdr;
1437 unsigned len;
1438 unsigned offset;
1439 int err;
1440
1441 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1442 return -EINVAL;
1443
1444 ip6h = ipv6_hdr(skb);
1445
1446 /*
1447 * We're interested in MLD messages only.
1448 * - Version is 6
1449 * - MLD has always Router Alert hop-by-hop option
1450 * - But we do not support jumbrograms.
1451 */
1452 if (ip6h->version != 6 ||
1453 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1454 ip6h->payload_len == 0)
1455 return 0;
1456
1457 len = ntohs(ip6h->payload_len);
1458 if (skb->len < len)
1459 return -EINVAL;
1460
1461 nexthdr = ip6h->nexthdr;
1462 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
1463
1464 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1465 return 0;
1466
1467 /* Okay, we found ICMPv6 header */
1468 skb2 = skb_clone(skb, GFP_ATOMIC);
1469 if (!skb2)
1470 return -ENOMEM;
1471
1472 len -= offset - skb_network_offset(skb2);
1473
1474 __skb_pull(skb2, offset);
1475 skb_reset_transport_header(skb2);
1476
1477 err = -EINVAL;
1478 if (!pskb_may_pull(skb2, sizeof(*icmp6h)))
1479 goto out;
1480
1481 icmp6h = icmp6_hdr(skb2);
1482
1483 switch (icmp6h->icmp6_type) {
1484 case ICMPV6_MGM_QUERY:
1485 case ICMPV6_MGM_REPORT:
1486 case ICMPV6_MGM_REDUCTION:
1487 case ICMPV6_MLD2_REPORT:
1488 break;
1489 default:
1490 err = 0;
1491 goto out;
1492 }
1493
1494 /* Okay, we found MLD message. Check further. */
1495 if (skb2->len > len) {
1496 err = pskb_trim_rcsum(skb2, len);
1497 if (err)
1498 goto out;
1499 }
1500
1501 switch (skb2->ip_summed) {
1502 case CHECKSUM_COMPLETE:
1503 if (!csum_fold(skb2->csum))
1504 break;
1505 /*FALLTHROUGH*/
1506 case CHECKSUM_NONE:
1507 skb2->csum = 0;
1508 if (skb_checksum_complete(skb2))
1509 goto out;
1510 }
1511
1512 err = 0;
1513
1514 BR_INPUT_SKB_CB(skb)->igmp = 1;
1515
1516 switch (icmp6h->icmp6_type) {
1517 case ICMPV6_MGM_REPORT:
1518 {
1519 struct mld_msg *mld = (struct mld_msg *)icmp6h;
1520 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1521 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1522 break;
1523 }
1524 case ICMPV6_MLD2_REPORT:
1525 err = br_ip6_multicast_mld2_report(br, port, skb2);
1526 break;
1527 case ICMPV6_MGM_QUERY:
1528 err = br_ip6_multicast_query(br, port, skb2);
1529 break;
1530 case ICMPV6_MGM_REDUCTION:
1531 {
1532 struct mld_msg *mld = (struct mld_msg *)icmp6h;
1533 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1534 }
1535 }
1536
1537 out:
1538 __skb_push(skb2, offset);
1539 if (skb2 != skb)
1540 kfree_skb(skb2);
1541 return err;
1542 }
1543 #endif
1544
1545 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1546 struct sk_buff *skb)
1547 {
1548 BR_INPUT_SKB_CB(skb)->igmp = 0;
1549 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1550
1551 if (br->multicast_disabled)
1552 return 0;
1553
1554 switch (skb->protocol) {
1555 case htons(ETH_P_IP):
1556 return br_multicast_ipv4_rcv(br, port, skb);
1557 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1558 case htons(ETH_P_IPV6):
1559 return br_multicast_ipv6_rcv(br, port, skb);
1560 #endif
1561 }
1562
1563 return 0;
1564 }
1565
1566 static void br_multicast_query_expired(unsigned long data)
1567 {
1568 struct net_bridge *br = (void *)data;
1569
1570 spin_lock(&br->multicast_lock);
1571 if (br->multicast_startup_queries_sent <
1572 br->multicast_startup_query_count)
1573 br->multicast_startup_queries_sent++;
1574
1575 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1576
1577 spin_unlock(&br->multicast_lock);
1578 }
1579
1580 void br_multicast_init(struct net_bridge *br)
1581 {
1582 br->hash_elasticity = 4;
1583 br->hash_max = 512;
1584
1585 br->multicast_router = 1;
1586 br->multicast_last_member_count = 2;
1587 br->multicast_startup_query_count = 2;
1588
1589 br->multicast_last_member_interval = HZ;
1590 br->multicast_query_response_interval = 10 * HZ;
1591 br->multicast_startup_query_interval = 125 * HZ / 4;
1592 br->multicast_query_interval = 125 * HZ;
1593 br->multicast_querier_interval = 255 * HZ;
1594 br->multicast_membership_interval = 260 * HZ;
1595
1596 spin_lock_init(&br->multicast_lock);
1597 setup_timer(&br->multicast_router_timer,
1598 br_multicast_local_router_expired, 0);
1599 setup_timer(&br->multicast_querier_timer,
1600 br_multicast_local_router_expired, 0);
1601 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1602 (unsigned long)br);
1603 }
1604
1605 void br_multicast_open(struct net_bridge *br)
1606 {
1607 br->multicast_startup_queries_sent = 0;
1608
1609 if (br->multicast_disabled)
1610 return;
1611
1612 mod_timer(&br->multicast_query_timer, jiffies);
1613 }
1614
1615 void br_multicast_stop(struct net_bridge *br)
1616 {
1617 struct net_bridge_mdb_htable *mdb;
1618 struct net_bridge_mdb_entry *mp;
1619 struct hlist_node *p, *n;
1620 u32 ver;
1621 int i;
1622
1623 del_timer_sync(&br->multicast_router_timer);
1624 del_timer_sync(&br->multicast_querier_timer);
1625 del_timer_sync(&br->multicast_query_timer);
1626
1627 spin_lock_bh(&br->multicast_lock);
1628 mdb = br->mdb;
1629 if (!mdb)
1630 goto out;
1631
1632 br->mdb = NULL;
1633
1634 ver = mdb->ver;
1635 for (i = 0; i < mdb->max; i++) {
1636 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1637 hlist[ver]) {
1638 del_timer(&mp->timer);
1639 del_timer(&mp->query_timer);
1640 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1641 }
1642 }
1643
1644 if (mdb->old) {
1645 spin_unlock_bh(&br->multicast_lock);
1646 rcu_barrier_bh();
1647 spin_lock_bh(&br->multicast_lock);
1648 WARN_ON(mdb->old);
1649 }
1650
1651 mdb->old = mdb;
1652 call_rcu_bh(&mdb->rcu, br_mdb_free);
1653
1654 out:
1655 spin_unlock_bh(&br->multicast_lock);
1656 }
1657
1658 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1659 {
1660 int err = -ENOENT;
1661
1662 spin_lock_bh(&br->multicast_lock);
1663 if (!netif_running(br->dev))
1664 goto unlock;
1665
1666 switch (val) {
1667 case 0:
1668 case 2:
1669 del_timer(&br->multicast_router_timer);
1670 /* fall through */
1671 case 1:
1672 br->multicast_router = val;
1673 err = 0;
1674 break;
1675
1676 default:
1677 err = -EINVAL;
1678 break;
1679 }
1680
1681 unlock:
1682 spin_unlock_bh(&br->multicast_lock);
1683
1684 return err;
1685 }
1686
1687 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1688 {
1689 struct net_bridge *br = p->br;
1690 int err = -ENOENT;
1691
1692 spin_lock(&br->multicast_lock);
1693 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1694 goto unlock;
1695
1696 switch (val) {
1697 case 0:
1698 case 1:
1699 case 2:
1700 p->multicast_router = val;
1701 err = 0;
1702
1703 if (val < 2 && !hlist_unhashed(&p->rlist))
1704 hlist_del_init_rcu(&p->rlist);
1705
1706 if (val == 1)
1707 break;
1708
1709 del_timer(&p->multicast_router_timer);
1710
1711 if (val == 0)
1712 break;
1713
1714 br_multicast_add_router(br, p);
1715 break;
1716
1717 default:
1718 err = -EINVAL;
1719 break;
1720 }
1721
1722 unlock:
1723 spin_unlock(&br->multicast_lock);
1724
1725 return err;
1726 }
1727
1728 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1729 {
1730 struct net_bridge_port *port;
1731 int err = -ENOENT;
1732
1733 spin_lock(&br->multicast_lock);
1734 if (!netif_running(br->dev))
1735 goto unlock;
1736
1737 err = 0;
1738 if (br->multicast_disabled == !val)
1739 goto unlock;
1740
1741 br->multicast_disabled = !val;
1742 if (br->multicast_disabled)
1743 goto unlock;
1744
1745 if (br->mdb) {
1746 if (br->mdb->old) {
1747 err = -EEXIST;
1748 rollback:
1749 br->multicast_disabled = !!val;
1750 goto unlock;
1751 }
1752
1753 err = br_mdb_rehash(&br->mdb, br->mdb->max,
1754 br->hash_elasticity);
1755 if (err)
1756 goto rollback;
1757 }
1758
1759 br_multicast_open(br);
1760 list_for_each_entry(port, &br->port_list, list) {
1761 if (port->state == BR_STATE_DISABLED ||
1762 port->state == BR_STATE_BLOCKING)
1763 continue;
1764
1765 __br_multicast_enable_port(port);
1766 }
1767
1768 unlock:
1769 spin_unlock(&br->multicast_lock);
1770
1771 return err;
1772 }
1773
1774 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1775 {
1776 int err = -ENOENT;
1777 u32 old;
1778
1779 spin_lock(&br->multicast_lock);
1780 if (!netif_running(br->dev))
1781 goto unlock;
1782
1783 err = -EINVAL;
1784 if (!is_power_of_2(val))
1785 goto unlock;
1786 if (br->mdb && val < br->mdb->size)
1787 goto unlock;
1788
1789 err = 0;
1790
1791 old = br->hash_max;
1792 br->hash_max = val;
1793
1794 if (br->mdb) {
1795 if (br->mdb->old) {
1796 err = -EEXIST;
1797 rollback:
1798 br->hash_max = old;
1799 goto unlock;
1800 }
1801
1802 err = br_mdb_rehash(&br->mdb, br->hash_max,
1803 br->hash_elasticity);
1804 if (err)
1805 goto rollback;
1806 }
1807
1808 unlock:
1809 spin_unlock(&br->multicast_lock);
1810
1811 return err;
1812 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree