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fix a race in ks8695_poll
[thirdparty/kernel/stable.git] / net / bridge / br_multicast.c
CommitLineData
eb1d1641
HX		 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>
b195167f 18#include <linux/log2.h>
eb1d1641
HX		 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
28#include "br_private.h"
29
30static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
31{
32 return jhash_1word(mdb->secret, (u32)ip) & (mdb->max - 1);
33}
34
35static struct net_bridge_mdb_entry *__br_mdb_ip_get(
36 struct net_bridge_mdb_htable *mdb, __be32 dst, int hash)
37{
38 struct net_bridge_mdb_entry *mp;
39 struct hlist_node *p;
40
41 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
42 if (dst == mp->addr)
43 return mp;
44 }
45
46 return NULL;
47}
48
49static struct net_bridge_mdb_entry *br_mdb_ip_get(
50 struct net_bridge_mdb_htable *mdb, __be32 dst)
51{
52 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
53}
54
55struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
56 struct sk_buff *skb)
57{
58 struct net_bridge_mdb_htable *mdb = br->mdb;
59
60 if (!mdb || br->multicast_disabled)
61 return NULL;
62
63 switch (skb->protocol) {
64 case htons(ETH_P_IP):
65 if (BR_INPUT_SKB_CB(skb)->igmp)
66 break;
67 return br_mdb_ip_get(mdb, ip_hdr(skb)->daddr);
68 }
69
70 return NULL;
71}
72
73static void br_mdb_free(struct rcu_head *head)
74{
75 struct net_bridge_mdb_htable *mdb =
76 container_of(head, struct net_bridge_mdb_htable, rcu);
77 struct net_bridge_mdb_htable *old = mdb->old;
78
79 mdb->old = NULL;
80 kfree(old->mhash);
81 kfree(old);
82}
83
84static int br_mdb_copy(struct net_bridge_mdb_htable *new,
85 struct net_bridge_mdb_htable *old,
86 int elasticity)
87{
88 struct net_bridge_mdb_entry *mp;
89 struct hlist_node *p;
90 int maxlen;
91 int len;
92 int i;
93
94 for (i = 0; i < old->max; i++)
95 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
96 hlist_add_head(&mp->hlist[new->ver],
97 &new->mhash[br_ip_hash(new, mp->addr)]);
98
99 if (!elasticity)
100 return 0;
101
102 maxlen = 0;
103 for (i = 0; i < new->max; i++) {
104 len = 0;
105 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
106 len++;
107 if (len > maxlen)
108 maxlen = len;
109 }
110
111 return maxlen > elasticity ? -EINVAL : 0;
112}
113
114static void br_multicast_free_pg(struct rcu_head *head)
115{
116 struct net_bridge_port_group *p =
117 container_of(head, struct net_bridge_port_group, rcu);
118
119 kfree(p);
120}
121
122static void br_multicast_free_group(struct rcu_head *head)
123{
124 struct net_bridge_mdb_entry *mp =
125 container_of(head, struct net_bridge_mdb_entry, rcu);
126
127 kfree(mp);
128}
129
130static void br_multicast_group_expired(unsigned long data)
131{
132 struct net_bridge_mdb_entry *mp = (void *)data;
133 struct net_bridge *br = mp->br;
134 struct net_bridge_mdb_htable *mdb;
135
136 spin_lock(&br->multicast_lock);
137 if (!netif_running(br->dev) || timer_pending(&mp->timer))
138 goto out;
139
140 if (!hlist_unhashed(&mp->mglist))
141 hlist_del_init(&mp->mglist);
142
143 if (mp->ports)
144 goto out;
145
146 mdb = br->mdb;
147 hlist_del_rcu(&mp->hlist[mdb->ver]);
148 mdb->size--;
149
150 del_timer(&mp->query_timer);
151 call_rcu_bh(&mp->rcu, br_multicast_free_group);
152
153out:
154 spin_unlock(&br->multicast_lock);
155}
156
157static void br_multicast_del_pg(struct net_bridge *br,
158 struct net_bridge_port_group *pg)
159{
160 struct net_bridge_mdb_htable *mdb = br->mdb;
161 struct net_bridge_mdb_entry *mp;
162 struct net_bridge_port_group *p;
163 struct net_bridge_port_group **pp;
164
165 mp = br_mdb_ip_get(mdb, pg->addr);
166 if (WARN_ON(!mp))
167 return;
168
169 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
170 if (p != pg)
171 continue;
172
173 *pp = p->next;
174 hlist_del_init(&p->mglist);
175 del_timer(&p->timer);
176 del_timer(&p->query_timer);
177 call_rcu_bh(&p->rcu, br_multicast_free_pg);
178
179 if (!mp->ports && hlist_unhashed(&mp->mglist) &&
180 netif_running(br->dev))
181 mod_timer(&mp->timer, jiffies);
182
183 return;
184 }
185
186 WARN_ON(1);
187}
188
189static void br_multicast_port_group_expired(unsigned long data)
190{
191 struct net_bridge_port_group *pg = (void *)data;
192 struct net_bridge *br = pg->port->br;
193
194 spin_lock(&br->multicast_lock);
195 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
196 hlist_unhashed(&pg->mglist))
197 goto out;
198
199 br_multicast_del_pg(br, pg);
200
201out:
202 spin_unlock(&br->multicast_lock);
203}
204
205static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max,
206 int elasticity)
207{
208 struct net_bridge_mdb_htable *old = *mdbp;
209 struct net_bridge_mdb_htable *mdb;
210 int err;
211
212 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
213 if (!mdb)
214 return -ENOMEM;
215
216 mdb->max = max;
217 mdb->old = old;
218
219 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
220 if (!mdb->mhash) {
221 kfree(mdb);
222 return -ENOMEM;
223 }
224
225 mdb->size = old ? old->size : 0;
226 mdb->ver = old ? old->ver ^ 1 : 0;
227
228 if (!old || elasticity)
229 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
230 else
231 mdb->secret = old->secret;
232
233 if (!old)
234 goto out;
235
236 err = br_mdb_copy(mdb, old, elasticity);
237 if (err) {
238 kfree(mdb->mhash);
239 kfree(mdb);
240 return err;
241 }
242
243 call_rcu_bh(&mdb->rcu, br_mdb_free);
244
245out:
246 rcu_assign_pointer(*mdbp, mdb);
247
248 return 0;
249}
250
251static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
252 __be32 group)
253{
254 struct sk_buff *skb;
255 struct igmphdr *ih;
256 struct ethhdr *eth;
257 struct iphdr *iph;
258
259 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
260 sizeof(*ih) + 4);
261 if (!skb)
262 goto out;
263
264 skb->protocol = htons(ETH_P_IP);
265
266 skb_reset_mac_header(skb);
267 eth = eth_hdr(skb);
268
269 memcpy(eth->h_source, br->dev->dev_addr, 6);
270 eth->h_dest[0] = 1;
271 eth->h_dest[1] = 0;
272 eth->h_dest[2] = 0x5e;
273 eth->h_dest[3] = 0;
274 eth->h_dest[4] = 0;
275 eth->h_dest[5] = 1;
276 eth->h_proto = htons(ETH_P_IP);
277 skb_put(skb, sizeof(*eth));
278
279 skb_set_network_header(skb, skb->len);
280 iph = ip_hdr(skb);
281
282 iph->version = 4;
283 iph->ihl = 6;
284 iph->tos = 0xc0;
285 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
286 iph->id = 0;
287 iph->frag_off = htons(IP_DF);
288 iph->ttl = 1;
289 iph->protocol = IPPROTO_IGMP;
290 iph->saddr = 0;
291 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
292 ((u8 *)&iph[1])[0] = IPOPT_RA;
293 ((u8 *)&iph[1])[1] = 4;
294 ((u8 *)&iph[1])[2] = 0;
295 ((u8 *)&iph[1])[3] = 0;
296 ip_send_check(iph);
297 skb_put(skb, 24);
298
299 skb_set_transport_header(skb, skb->len);
300 ih = igmp_hdr(skb);
301 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
302 ih->code = (group ? br->multicast_last_member_interval :
303 br->multicast_query_response_interval) /
304 (HZ / IGMP_TIMER_SCALE);
305 ih->group = group;
306 ih->csum = 0;
307 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
308 skb_put(skb, sizeof(*ih));
309
310 __skb_pull(skb, sizeof(*eth));
311
312out:
313 return skb;
314}
315
316static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
317{
318 struct net_bridge *br = mp->br;
319 struct sk_buff *skb;
320
321 skb = br_multicast_alloc_query(br, mp->addr);
322 if (!skb)
323 goto timer;
324
325 netif_rx(skb);
326
327timer:
328 if (++mp->queries_sent < br->multicast_last_member_count)
329 mod_timer(&mp->query_timer,
330 jiffies + br->multicast_last_member_interval);
331}
332
333static void br_multicast_group_query_expired(unsigned long data)
334{
335 struct net_bridge_mdb_entry *mp = (void *)data;
336 struct net_bridge *br = mp->br;
337
338 spin_lock(&br->multicast_lock);
339 if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
340 mp->queries_sent >= br->multicast_last_member_count)
341 goto out;
342
343 br_multicast_send_group_query(mp);
344
345out:
346 spin_unlock(&br->multicast_lock);
347}
348
349static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
350{
351 struct net_bridge_port *port = pg->port;
352 struct net_bridge *br = port->br;
353 struct sk_buff *skb;
354
355 skb = br_multicast_alloc_query(br, pg->addr);
356 if (!skb)
357 goto timer;
358
359 br_deliver(port, skb);
360
361timer:
362 if (++pg->queries_sent < br->multicast_last_member_count)
363 mod_timer(&pg->query_timer,
364 jiffies + br->multicast_last_member_interval);
365}
366
367static void br_multicast_port_group_query_expired(unsigned long data)
368{
369 struct net_bridge_port_group *pg = (void *)data;
370 struct net_bridge_port *port = pg->port;
371 struct net_bridge *br = port->br;
372
373 spin_lock(&br->multicast_lock);
374 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
375 pg->queries_sent >= br->multicast_last_member_count)
376 goto out;
377
378 br_multicast_send_port_group_query(pg);
379
380out:
381 spin_unlock(&br->multicast_lock);
382}
383
384static struct net_bridge_mdb_entry *br_multicast_get_group(
385 struct net_bridge *br, struct net_bridge_port *port, __be32 group,
386 int hash)
387{
388 struct net_bridge_mdb_htable *mdb = br->mdb;
389 struct net_bridge_mdb_entry *mp;
390 struct hlist_node *p;
391 unsigned count = 0;
392 unsigned max;
393 int elasticity;
394 int err;
395
396 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
397 count++;
398 if (unlikely(group == mp->addr)) {
399 return mp;
400 }
401 }
402
403 elasticity = 0;
404 max = mdb->max;
405
406 if (unlikely(count > br->hash_elasticity && count)) {
407 if (net_ratelimit())
408 printk(KERN_INFO "%s: Multicast hash table "
409 "chain limit reached: %s\n",
410 br->dev->name, port ? port->dev->name :
411 br->dev->name);
412
413 elasticity = br->hash_elasticity;
414 }
415
416 if (mdb->size >= max) {
417 max *= 2;
418 if (unlikely(max >= br->hash_max)) {
419 printk(KERN_WARNING "%s: Multicast hash table maximum "
420 "reached, disabling snooping: %s, %d\n",
421 br->dev->name, port ? port->dev->name :
422 br->dev->name,
423 max);
424 err = -E2BIG;
425disable:
426 br->multicast_disabled = 1;
427 goto err;
428 }
429 }
430
431 if (max > mdb->max || elasticity) {
432 if (mdb->old) {
433 if (net_ratelimit())
434 printk(KERN_INFO "%s: Multicast hash table "
435 "on fire: %s\n",
436 br->dev->name, port ? port->dev->name :
437 br->dev->name);
438 err = -EEXIST;
439 goto err;
440 }
441
442 err = br_mdb_rehash(&br->mdb, max, elasticity);
443 if (err) {
444 printk(KERN_WARNING "%s: Cannot rehash multicast "
445 "hash table, disabling snooping: "
446 "%s, %d, %d\n",
447 br->dev->name, port ? port->dev->name :
448 br->dev->name,
449 mdb->size, err);
450 goto disable;
451 }
452
453 err = -EAGAIN;
454 goto err;
455 }
456
457 return NULL;
458
459err:
460 mp = ERR_PTR(err);
461 return mp;
462}
463
464static struct net_bridge_mdb_entry *br_multicast_new_group(
465 struct net_bridge *br, struct net_bridge_port *port, __be32 group)
466{
467 struct net_bridge_mdb_htable *mdb = br->mdb;
468 struct net_bridge_mdb_entry *mp;
469 int hash;
470
471 if (!mdb) {
472 if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0))
473 return NULL;
474 goto rehash;
475 }
476
477 hash = br_ip_hash(mdb, group);
478 mp = br_multicast_get_group(br, port, group, hash);
479 switch (PTR_ERR(mp)) {
480 case 0:
481 break;
482
483 case -EAGAIN:
484rehash:
485 mdb = br->mdb;
486 hash = br_ip_hash(mdb, group);
487 break;
488
489 default:
490 goto out;
491 }
492
493 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
494 if (unlikely(!mp))
495 goto out;
496
497 mp->br = br;
498 mp->addr = group;
499 setup_timer(&mp->timer, br_multicast_group_expired,
500 (unsigned long)mp);
501 setup_timer(&mp->query_timer, br_multicast_group_query_expired,
502 (unsigned long)mp);
503
504 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
505 mdb->size++;
506
507out:
508 return mp;
509}
510
511static int br_multicast_add_group(struct net_bridge *br,
512 struct net_bridge_port *port, __be32 group)
513{
514 struct net_bridge_mdb_entry *mp;
515 struct net_bridge_port_group *p;
516 struct net_bridge_port_group **pp;
517 unsigned long now = jiffies;
518 int err;
519
520 if (ipv4_is_local_multicast(group))
521 return 0;
522
523 spin_lock(&br->multicast_lock);
524 if (!netif_running(br->dev) ||
525 (port && port->state == BR_STATE_DISABLED))
526 goto out;
527
528 mp = br_multicast_new_group(br, port, group);
529 err = PTR_ERR(mp);
530 if (unlikely(IS_ERR(mp) || !mp))
531 goto err;
532
533 if (!port) {
534 hlist_add_head(&mp->mglist, &br->mglist);
535 mod_timer(&mp->timer, now + br->multicast_membership_interval);
536 goto out;
537 }
538
539 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
540 if (p->port == port)
541 goto found;
542 if ((unsigned long)p->port < (unsigned long)port)
543 break;
544 }
545
546 p = kzalloc(sizeof(*p), GFP_ATOMIC);
547 err = -ENOMEM;
548 if (unlikely(!p))
549 goto err;
550
551 p->addr = group;
552 p->port = port;
553 p->next = *pp;
554 hlist_add_head(&p->mglist, &port->mglist);
555 setup_timer(&p->timer, br_multicast_port_group_expired,
556 (unsigned long)p);
557 setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
558 (unsigned long)p);
559
560 rcu_assign_pointer(*pp, p);
561
562found:
563 mod_timer(&p->timer, now + br->multicast_membership_interval);
564out:
565 err = 0;
566
567err:
568 spin_unlock(&br->multicast_lock);
569 return err;
570}
571
572static void br_multicast_router_expired(unsigned long data)
573{
574 struct net_bridge_port *port = (void *)data;
575 struct net_bridge *br = port->br;
576
577 spin_lock(&br->multicast_lock);
578 if (port->multicast_router != 1 ||
579 timer_pending(&port->multicast_router_timer) ||
580 hlist_unhashed(&port->rlist))
581 goto out;
582
583 hlist_del_init_rcu(&port->rlist);
584
585out:
586 spin_unlock(&br->multicast_lock);
587}
588
589static void br_multicast_local_router_expired(unsigned long data)
590{
591}
592
593static void br_multicast_send_query(struct net_bridge *br,
594 struct net_bridge_port *port, u32 sent)
595{
596 unsigned long time;
597 struct sk_buff *skb;
598
599 if (!netif_running(br->dev) || br->multicast_disabled ||
600 timer_pending(&br->multicast_querier_timer))
601 return;
602
603 skb = br_multicast_alloc_query(br, 0);
604 if (!skb)
605 goto timer;
606
607 if (port) {
608 __skb_push(skb, sizeof(struct ethhdr));
609 skb->dev = port->dev;
610 NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
611 dev_queue_xmit);
612 } else
613 netif_rx(skb);
614
615timer:
616 time = jiffies;
617 time += sent < br->multicast_startup_query_count ?
618 br->multicast_startup_query_interval :
619 br->multicast_query_interval;
620 mod_timer(port ? &port->multicast_query_timer :
621 &br->multicast_query_timer, time);
622}
623
624static void br_multicast_port_query_expired(unsigned long data)
625{
626 struct net_bridge_port *port = (void *)data;
627 struct net_bridge *br = port->br;
628
629 spin_lock(&br->multicast_lock);
630 if (port && (port->state == BR_STATE_DISABLED ||
631 port->state == BR_STATE_BLOCKING))
632 goto out;
633
634 if (port->multicast_startup_queries_sent <
635 br->multicast_startup_query_count)
636 port->multicast_startup_queries_sent++;
637
638 br_multicast_send_query(port->br, port,
639 port->multicast_startup_queries_sent);
640
641out:
642 spin_unlock(&br->multicast_lock);
643}
644
645void br_multicast_add_port(struct net_bridge_port *port)
646{
647 port->multicast_router = 1;
648
649 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
650 (unsigned long)port);
651 setup_timer(&port->multicast_query_timer,
652 br_multicast_port_query_expired, (unsigned long)port);
653}
654
655void br_multicast_del_port(struct net_bridge_port *port)
656{
657 del_timer_sync(&port->multicast_router_timer);
658}
659
561f1103
HX		 660static void __br_multicast_enable_port(struct net_bridge_port *port)
661{
662 port->multicast_startup_queries_sent = 0;
663
664 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
665 del_timer(&port->multicast_query_timer))
666 mod_timer(&port->multicast_query_timer, jiffies);
667}
668
eb1d1641
HX		 669void br_multicast_enable_port(struct net_bridge_port *port)
670{
671 struct net_bridge *br = port->br;
672
673 spin_lock(&br->multicast_lock);
674 if (br->multicast_disabled || !netif_running(br->dev))
675 goto out;
676
561f1103 677 __br_multicast_enable_port(port);
eb1d1641
HX		 678
679out:
680 spin_unlock(&br->multicast_lock);
681}
682
683void br_multicast_disable_port(struct net_bridge_port *port)
684{
685 struct net_bridge *br = port->br;
686 struct net_bridge_port_group *pg;
687 struct hlist_node *p, *n;
688
689 spin_lock(&br->multicast_lock);
690 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
691 br_multicast_del_pg(br, pg);
692
693 if (!hlist_unhashed(&port->rlist))
694 hlist_del_init_rcu(&port->rlist);
695 del_timer(&port->multicast_router_timer);
696 del_timer(&port->multicast_query_timer);
697 spin_unlock(&br->multicast_lock);
698}
699
700static int br_multicast_igmp3_report(struct net_bridge *br,
701 struct net_bridge_port *port,
702 struct sk_buff *skb)
703{
704 struct igmpv3_report *ih;
705 struct igmpv3_grec *grec;
706 int i;
707 int len;
708 int num;
709 int type;
710 int err = 0;
711 __be32 group;
712
713 if (!pskb_may_pull(skb, sizeof(*ih)))
714 return -EINVAL;
715
716 ih = igmpv3_report_hdr(skb);
717 num = ntohs(ih->ngrec);
718 len = sizeof(*ih);
719
720 for (i = 0; i < num; i++) {
721 len += sizeof(*grec);
722 if (!pskb_may_pull(skb, len))
723 return -EINVAL;
724
725 grec = (void *)(skb->data + len);
726 group = grec->grec_mca;
727 type = grec->grec_type;
728
729 len += grec->grec_nsrcs * 4;
730 if (!pskb_may_pull(skb, len))
731 return -EINVAL;
732
733 /* We treat this as an IGMPv2 report for now. */
734 switch (type) {
735 case IGMPV3_MODE_IS_INCLUDE:
736 case IGMPV3_MODE_IS_EXCLUDE:
737 case IGMPV3_CHANGE_TO_INCLUDE:
738 case IGMPV3_CHANGE_TO_EXCLUDE:
739 case IGMPV3_ALLOW_NEW_SOURCES:
740 case IGMPV3_BLOCK_OLD_SOURCES:
741 break;
742
743 default:
744 continue;
745 }
746
747 err = br_multicast_add_group(br, port, group);
748 if (err)
749 break;
750 }
751
752 return err;
753}
754
0909e117
HX		 755static void br_multicast_add_router(struct net_bridge *br,
756 struct net_bridge_port *port)
757{
758 struct hlist_node *p;
759 struct hlist_node **h;
760
761 for (h = &br->router_list.first;
762 (p = *h) &&
763 (unsigned long)container_of(p, struct net_bridge_port, rlist) >
764 (unsigned long)port;
765 h = &p->next)
766 ;
767
768 port->rlist.pprev = h;
769 port->rlist.next = p;
770 rcu_assign_pointer(*h, &port->rlist);
771 if (p)
772 p->pprev = &port->rlist.next;
773}
774
eb1d1641
HX		 775static void br_multicast_mark_router(struct net_bridge *br,
776 struct net_bridge_port *port)
777{
778 unsigned long now = jiffies;
eb1d1641
HX		 779
780 if (!port) {
781 if (br->multicast_router == 1)
782 mod_timer(&br->multicast_router_timer,
783 now + br->multicast_querier_interval);
784 return;
785 }
786
787 if (port->multicast_router != 1)
788 return;
789
790 if (!hlist_unhashed(&port->rlist))
791 goto timer;
792
0909e117 793 br_multicast_add_router(br, port);
eb1d1641
HX		 794
795timer:
796 mod_timer(&port->multicast_router_timer,
797 now + br->multicast_querier_interval);
798}
799
800static void br_multicast_query_received(struct net_bridge *br,
801 struct net_bridge_port *port,
802 __be32 saddr)
803{
804 if (saddr)
805 mod_timer(&br->multicast_querier_timer,
806 jiffies + br->multicast_querier_interval);
807 else if (timer_pending(&br->multicast_querier_timer))
808 return;
809
810 br_multicast_mark_router(br, port);
811}
812
813static int br_multicast_query(struct net_bridge *br,
814 struct net_bridge_port *port,
815 struct sk_buff *skb)
816{
817 struct iphdr *iph = ip_hdr(skb);
818 struct igmphdr *ih = igmp_hdr(skb);
819 struct net_bridge_mdb_entry *mp;
820 struct igmpv3_query *ih3;
821 struct net_bridge_port_group *p;
822 struct net_bridge_port_group **pp;
823 unsigned long max_delay;
824 unsigned long now = jiffies;
825 __be32 group;
826
827 spin_lock(&br->multicast_lock);
828 if (!netif_running(br->dev) ||
829 (port && port->state == BR_STATE_DISABLED))
830 goto out;
831
832 br_multicast_query_received(br, port, iph->saddr);
833
834 group = ih->group;
835
836 if (skb->len == sizeof(*ih)) {
837 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
838
839 if (!max_delay) {
840 max_delay = 10 * HZ;
841 group = 0;
842 }
843 } else {
844 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
845 return -EINVAL;
846
847 ih3 = igmpv3_query_hdr(skb);
848 if (ih3->nsrcs)
849 return 0;
850
851 max_delay = ih3->code ? 1 :
852 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE);
853 }
854
855 if (!group)
856 goto out;
857
858 mp = br_mdb_ip_get(br->mdb, group);
859 if (!mp)
860 goto out;
861
862 max_delay *= br->multicast_last_member_count;
863
864 if (!hlist_unhashed(&mp->mglist) &&
865 (timer_pending(&mp->timer) ?
866 time_after(mp->timer.expires, now + max_delay) :
867 try_to_del_timer_sync(&mp->timer) >= 0))
868 mod_timer(&mp->timer, now + max_delay);
869
870 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
871 if (timer_pending(&p->timer) ?
872 time_after(p->timer.expires, now + max_delay) :
873 try_to_del_timer_sync(&p->timer) >= 0)
874 mod_timer(&mp->timer, now + max_delay);
875 }
876
877out:
878 spin_unlock(&br->multicast_lock);
879 return 0;
880}
881
882static void br_multicast_leave_group(struct net_bridge *br,
883 struct net_bridge_port *port,
884 __be32 group)
885{
886 struct net_bridge_mdb_htable *mdb;
887 struct net_bridge_mdb_entry *mp;
888 struct net_bridge_port_group *p;
889 unsigned long now;
890 unsigned long time;
891
892 if (ipv4_is_local_multicast(group))
893 return;
894
895 spin_lock(&br->multicast_lock);
896 if (!netif_running(br->dev) ||
897 (port && port->state == BR_STATE_DISABLED) ||
898 timer_pending(&br->multicast_querier_timer))
899 goto out;
900
901 mdb = br->mdb;
902 mp = br_mdb_ip_get(mdb, group);
903 if (!mp)
904 goto out;
905
906 now = jiffies;
907 time = now + br->multicast_last_member_count *
908 br->multicast_last_member_interval;
909
910 if (!port) {
911 if (!hlist_unhashed(&mp->mglist) &&
912 (timer_pending(&mp->timer) ?
913 time_after(mp->timer.expires, time) :
914 try_to_del_timer_sync(&mp->timer) >= 0)) {
915 mod_timer(&mp->timer, time);
916
917 mp->queries_sent = 0;
918 mod_timer(&mp->query_timer, now);
919 }
920
921 goto out;
922 }
923
924 for (p = mp->ports; p; p = p->next) {
925 if (p->port != port)
926 continue;
927
928 if (!hlist_unhashed(&p->mglist) &&
929 (timer_pending(&p->timer) ?
930 time_after(p->timer.expires, time) :
931 try_to_del_timer_sync(&p->timer) >= 0)) {
932 mod_timer(&p->timer, time);
933
934 p->queries_sent = 0;
935 mod_timer(&p->query_timer, now);
936 }
937
938 break;
939 }
940
941out:
942 spin_unlock(&br->multicast_lock);
943}
944
945static int br_multicast_ipv4_rcv(struct net_bridge *br,
946 struct net_bridge_port *port,
947 struct sk_buff *skb)
948{
949 struct sk_buff *skb2 = skb;
950 struct iphdr *iph;
951 struct igmphdr *ih;
952 unsigned len;
953 unsigned offset;
954 int err;
955
956 BR_INPUT_SKB_CB(skb)->igmp = 0;
957 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
958
959 /* We treat OOM as packet loss for now. */
960 if (!pskb_may_pull(skb, sizeof(*iph)))
961 return -EINVAL;
962
963 iph = ip_hdr(skb);
964
965 if (iph->ihl < 5 || iph->version != 4)
966 return -EINVAL;
967
968 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
969 return -EINVAL;
970
971 iph = ip_hdr(skb);
972
973 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
974 return -EINVAL;
975
976 if (iph->protocol != IPPROTO_IGMP)
977 return 0;
978
979 len = ntohs(iph->tot_len);
980 if (skb->len < len || len < ip_hdrlen(skb))
981 return -EINVAL;
982
983 if (skb->len > len) {
984 skb2 = skb_clone(skb, GFP_ATOMIC);
985 if (!skb2)
986 return -ENOMEM;
987
988 err = pskb_trim_rcsum(skb2, len);
989 if (err)
990 return err;
991 }
992
993 len -= ip_hdrlen(skb2);
994 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
995 __skb_pull(skb2, offset);
996 skb_reset_transport_header(skb2);
997
998 err = -EINVAL;
999 if (!pskb_may_pull(skb2, sizeof(*ih)))
1000 goto out;
1001
1002 iph = ip_hdr(skb2);
1003
1004 switch (skb2->ip_summed) {
1005 case CHECKSUM_COMPLETE:
1006 if (!csum_fold(skb2->csum))
1007 break;
1008 /* fall through */
1009 case CHECKSUM_NONE:
1010 skb2->csum = 0;
1011 if (skb_checksum_complete(skb2))
1012 return -EINVAL;
1013 }
1014
1015 err = 0;
1016
1017 BR_INPUT_SKB_CB(skb)->igmp = 1;
1018 ih = igmp_hdr(skb2);
1019
1020 switch (ih->type) {
1021 case IGMP_HOST_MEMBERSHIP_REPORT:
1022 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1023 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1024 err = br_multicast_add_group(br, port, ih->group);
1025 break;
1026 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1027 err = br_multicast_igmp3_report(br, port, skb2);
1028 break;
1029 case IGMP_HOST_MEMBERSHIP_QUERY:
1030 err = br_multicast_query(br, port, skb2);
1031 break;
1032 case IGMP_HOST_LEAVE_MESSAGE:
1033 br_multicast_leave_group(br, port, ih->group);
1034 break;
1035 }
1036
1037out:
1038 __skb_push(skb2, offset);
1039 if (skb2 != skb)
1040 kfree_skb(skb2);
1041 return err;
1042}
1043
1044int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1045 struct sk_buff *skb)
1046{
1047 if (br->multicast_disabled)
1048 return 0;
1049
1050 switch (skb->protocol) {
1051 case htons(ETH_P_IP):
1052 return br_multicast_ipv4_rcv(br, port, skb);
1053 }
1054
1055 return 0;
1056}
1057
1058static void br_multicast_query_expired(unsigned long data)
1059{
1060 struct net_bridge *br = (void *)data;
1061
1062 spin_lock(&br->multicast_lock);
1063 if (br->multicast_startup_queries_sent <
1064 br->multicast_startup_query_count)
1065 br->multicast_startup_queries_sent++;
1066
1067 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1068
1069 spin_unlock(&br->multicast_lock);
1070}
1071
1072void br_multicast_init(struct net_bridge *br)
1073{
1074 br->hash_elasticity = 4;
1075 br->hash_max = 512;
1076
1077 br->multicast_router = 1;
1078 br->multicast_last_member_count = 2;
1079 br->multicast_startup_query_count = 2;
1080
1081 br->multicast_last_member_interval = HZ;
1082 br->multicast_query_response_interval = 10 * HZ;
1083 br->multicast_startup_query_interval = 125 * HZ / 4;
1084 br->multicast_query_interval = 125 * HZ;
1085 br->multicast_querier_interval = 255 * HZ;
1086 br->multicast_membership_interval = 260 * HZ;
1087
1088 spin_lock_init(&br->multicast_lock);
1089 setup_timer(&br->multicast_router_timer,
1090 br_multicast_local_router_expired, 0);
1091 setup_timer(&br->multicast_querier_timer,
1092 br_multicast_local_router_expired, 0);
1093 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1094 (unsigned long)br);
1095}
1096
1097void br_multicast_open(struct net_bridge *br)
1098{
1099 br->multicast_startup_queries_sent = 0;
1100
1101 if (br->multicast_disabled)
1102 return;
1103
1104 mod_timer(&br->multicast_query_timer, jiffies);
1105}
1106
1107void br_multicast_stop(struct net_bridge *br)
1108{
1109 struct net_bridge_mdb_htable *mdb;
1110 struct net_bridge_mdb_entry *mp;
1111 struct hlist_node *p, *n;
1112 u32 ver;
1113 int i;
1114
1115 del_timer_sync(&br->multicast_router_timer);
1116 del_timer_sync(&br->multicast_querier_timer);
1117 del_timer_sync(&br->multicast_query_timer);
1118
1119 spin_lock_bh(&br->multicast_lock);
1120 mdb = br->mdb;
1121 if (!mdb)
1122 goto out;
1123
1124 br->mdb = NULL;
1125
1126 ver = mdb->ver;
1127 for (i = 0; i < mdb->max; i++) {
1128 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1129 hlist[ver]) {
1130 del_timer(&mp->timer);
1131 del_timer(&mp->query_timer);
1132 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1133 }
1134 }
1135
1136 if (mdb->old) {
1137 spin_unlock_bh(&br->multicast_lock);
1138 synchronize_rcu_bh();
1139 spin_lock_bh(&br->multicast_lock);
1140 WARN_ON(mdb->old);
1141 }
1142
1143 mdb->old = mdb;
1144 call_rcu_bh(&mdb->rcu, br_mdb_free);
1145
1146out:
1147 spin_unlock_bh(&br->multicast_lock);
1148}
0909e117
HX		 1149
1150int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1151{
1152 int err = -ENOENT;
1153
1154 spin_lock_bh(&br->multicast_lock);
1155 if (!netif_running(br->dev))
1156 goto unlock;
1157
1158 switch (val) {
1159 case 0:
1160 case 2:
1161 del_timer(&br->multicast_router_timer);
1162 /* fall through */
1163 case 1:
1164 br->multicast_router = val;
1165 err = 0;
1166 break;
1167
1168 default:
1169 err = -EINVAL;
1170 break;
1171 }
1172
1173unlock:
1174 spin_unlock_bh(&br->multicast_lock);
1175
1176 return err;
1177}
1178
1179int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1180{
1181 struct net_bridge *br = p->br;
1182 int err = -ENOENT;
1183
1184 spin_lock(&br->multicast_lock);
1185 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1186 goto unlock;
1187
1188 switch (val) {
1189 case 0:
1190 case 1:
1191 case 2:
1192 p->multicast_router = val;
1193 err = 0;
1194
1195 if (val < 2 && !hlist_unhashed(&p->rlist))
1196 hlist_del_init_rcu(&p->rlist);
1197
1198 if (val == 1)
1199 break;
1200
1201 del_timer(&p->multicast_router_timer);
1202
1203 if (val == 0)
1204 break;
1205
1206 br_multicast_add_router(br, p);
1207 break;
1208
1209 default:
1210 err = -EINVAL;
1211 break;
1212 }
1213
1214unlock:
1215 spin_unlock(&br->multicast_lock);
1216
1217 return err;
1218}
561f1103
HX		 1219
1220int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1221{
1222 struct net_bridge_port *port;
1223 int err = -ENOENT;
1224
1225 spin_lock(&br->multicast_lock);
1226 if (!netif_running(br->dev))
1227 goto unlock;
1228
1229 err = 0;
1230 if (br->multicast_disabled == !val)
1231 goto unlock;
1232
1233 br->multicast_disabled = !val;
1234 if (br->multicast_disabled)
1235 goto unlock;
1236
1237 if (br->mdb) {
1238 if (br->mdb->old) {
1239 err = -EEXIST;
1240rollback:
1241 br->multicast_disabled = !!val;
1242 goto unlock;
1243 }
1244
1245 err = br_mdb_rehash(&br->mdb, br->mdb->max,
1246 br->hash_elasticity);
1247 if (err)
1248 goto rollback;
1249 }
1250
1251 br_multicast_open(br);
1252 list_for_each_entry(port, &br->port_list, list) {
1253 if (port->state == BR_STATE_DISABLED ||
1254 port->state == BR_STATE_BLOCKING)
1255 continue;
1256
1257 __br_multicast_enable_port(port);
1258 }
1259
1260unlock:
1261 spin_unlock(&br->multicast_lock);
1262
1263 return err;
1264}
b195167f
HX		 1265
1266int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1267{
1268 int err = -ENOENT;
1269 u32 old;
1270
1271 spin_lock(&br->multicast_lock);
1272 if (!netif_running(br->dev))
1273 goto unlock;
1274
1275 err = -EINVAL;
1276 if (!is_power_of_2(val))
1277 goto unlock;
1278 if (br->mdb && val < br->mdb->size)
1279 goto unlock;
1280
1281 err = 0;
1282
1283 old = br->hash_max;
1284 br->hash_max = val;
1285
1286 if (br->mdb) {
1287 if (br->mdb->old) {
1288 err = -EEXIST;
1289rollback:
1290 br->hash_max = old;
1291 goto unlock;
1292 }
1293
1294 err = br_mdb_rehash(&br->mdb, br->hash_max,
1295 br->hash_elasticity);
1296 if (err)
1297 goto rollback;
1298 }
1299
1300unlock:
1301 spin_unlock(&br->multicast_lock);
1302
1303 return err;
1304}
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