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[mirror_ubuntu-jammy-kernel.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
49f5fcfd 41 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
eb1d1641
HX		 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);
02a780c0
DC		 630 if (port->state == BR_STATE_DISABLED ||
631 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 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;
bec68ff1 826 int err = 0;
eb1d1641
HX		 827
828 spin_lock(&br->multicast_lock);
829 if (!netif_running(br->dev) ||
830 (port && port->state == BR_STATE_DISABLED))
831 goto out;
832
833 br_multicast_query_received(br, port, iph->saddr);
834
835 group = ih->group;
836
837 if (skb->len == sizeof(*ih)) {
838 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
839
840 if (!max_delay) {
841 max_delay = 10 * HZ;
842 group = 0;
843 }
844 } else {
bec68ff1
YH		 845 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
846 err = -EINVAL;
847 goto out;
848 }
eb1d1641
HX		 849
850 ih3 = igmpv3_query_hdr(skb);
851 if (ih3->nsrcs)
bec68ff1 852 goto out;
eb1d1641
HX		 853
854 max_delay = ih3->code ? 1 :
855 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE);
856 }
857
858 if (!group)
859 goto out;
860
861 mp = br_mdb_ip_get(br->mdb, group);
862 if (!mp)
863 goto out;
864
865 max_delay *= br->multicast_last_member_count;
866
867 if (!hlist_unhashed(&mp->mglist) &&
868 (timer_pending(&mp->timer) ?
869 time_after(mp->timer.expires, now + max_delay) :
870 try_to_del_timer_sync(&mp->timer) >= 0))
871 mod_timer(&mp->timer, now + max_delay);
872
873 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
874 if (timer_pending(&p->timer) ?
875 time_after(p->timer.expires, now + max_delay) :
876 try_to_del_timer_sync(&p->timer) >= 0)
877 mod_timer(&mp->timer, now + max_delay);
878 }
879
880out:
881 spin_unlock(&br->multicast_lock);
bec68ff1 882 return err;
eb1d1641
HX		 883}
884
885static void br_multicast_leave_group(struct net_bridge *br,
886 struct net_bridge_port *port,
887 __be32 group)
888{
889 struct net_bridge_mdb_htable *mdb;
890 struct net_bridge_mdb_entry *mp;
891 struct net_bridge_port_group *p;
892 unsigned long now;
893 unsigned long time;
894
895 if (ipv4_is_local_multicast(group))
896 return;
897
898 spin_lock(&br->multicast_lock);
899 if (!netif_running(br->dev) ||
900 (port && port->state == BR_STATE_DISABLED) ||
901 timer_pending(&br->multicast_querier_timer))
902 goto out;
903
904 mdb = br->mdb;
905 mp = br_mdb_ip_get(mdb, group);
906 if (!mp)
907 goto out;
908
909 now = jiffies;
910 time = now + br->multicast_last_member_count *
911 br->multicast_last_member_interval;
912
913 if (!port) {
914 if (!hlist_unhashed(&mp->mglist) &&
915 (timer_pending(&mp->timer) ?
916 time_after(mp->timer.expires, time) :
917 try_to_del_timer_sync(&mp->timer) >= 0)) {
918 mod_timer(&mp->timer, time);
919
920 mp->queries_sent = 0;
921 mod_timer(&mp->query_timer, now);
922 }
923
924 goto out;
925 }
926
927 for (p = mp->ports; p; p = p->next) {
928 if (p->port != port)
929 continue;
930
931 if (!hlist_unhashed(&p->mglist) &&
932 (timer_pending(&p->timer) ?
933 time_after(p->timer.expires, time) :
934 try_to_del_timer_sync(&p->timer) >= 0)) {
935 mod_timer(&p->timer, time);
936
937 p->queries_sent = 0;
938 mod_timer(&p->query_timer, now);
939 }
940
941 break;
942 }
943
944out:
945 spin_unlock(&br->multicast_lock);
946}
947
948static int br_multicast_ipv4_rcv(struct net_bridge *br,
949 struct net_bridge_port *port,
950 struct sk_buff *skb)
951{
952 struct sk_buff *skb2 = skb;
953 struct iphdr *iph;
954 struct igmphdr *ih;
955 unsigned len;
956 unsigned offset;
957 int err;
958
959 BR_INPUT_SKB_CB(skb)->igmp = 0;
960 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
961
962 /* We treat OOM as packet loss for now. */
963 if (!pskb_may_pull(skb, sizeof(*iph)))
964 return -EINVAL;
965
966 iph = ip_hdr(skb);
967
968 if (iph->ihl < 5 || iph->version != 4)
969 return -EINVAL;
970
971 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
972 return -EINVAL;
973
974 iph = ip_hdr(skb);
975
976 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
977 return -EINVAL;
978
979 if (iph->protocol != IPPROTO_IGMP)
980 return 0;
981
982 len = ntohs(iph->tot_len);
983 if (skb->len < len || len < ip_hdrlen(skb))
984 return -EINVAL;
985
986 if (skb->len > len) {
987 skb2 = skb_clone(skb, GFP_ATOMIC);
988 if (!skb2)
989 return -ENOMEM;
990
991 err = pskb_trim_rcsum(skb2, len);
992 if (err)
993 return err;
994 }
995
996 len -= ip_hdrlen(skb2);
997 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
998 __skb_pull(skb2, offset);
999 skb_reset_transport_header(skb2);
1000
1001 err = -EINVAL;
1002 if (!pskb_may_pull(skb2, sizeof(*ih)))
1003 goto out;
1004
1005 iph = ip_hdr(skb2);
1006
1007 switch (skb2->ip_summed) {
1008 case CHECKSUM_COMPLETE:
1009 if (!csum_fold(skb2->csum))
1010 break;
1011 /* fall through */
1012 case CHECKSUM_NONE:
1013 skb2->csum = 0;
1014 if (skb_checksum_complete(skb2))
1015 return -EINVAL;
1016 }
1017
1018 err = 0;
1019
1020 BR_INPUT_SKB_CB(skb)->igmp = 1;
1021 ih = igmp_hdr(skb2);
1022
1023 switch (ih->type) {
1024 case IGMP_HOST_MEMBERSHIP_REPORT:
1025 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1026 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1027 err = br_multicast_add_group(br, port, ih->group);
1028 break;
1029 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1030 err = br_multicast_igmp3_report(br, port, skb2);
1031 break;
1032 case IGMP_HOST_MEMBERSHIP_QUERY:
1033 err = br_multicast_query(br, port, skb2);
1034 break;
1035 case IGMP_HOST_LEAVE_MESSAGE:
1036 br_multicast_leave_group(br, port, ih->group);
1037 break;
1038 }
1039
1040out:
1041 __skb_push(skb2, offset);
1042 if (skb2 != skb)
1043 kfree_skb(skb2);
1044 return err;
1045}
1046
1047int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1048 struct sk_buff *skb)
1049{
1050 if (br->multicast_disabled)
1051 return 0;
1052
1053 switch (skb->protocol) {
1054 case htons(ETH_P_IP):
1055 return br_multicast_ipv4_rcv(br, port, skb);
1056 }
1057
1058 return 0;
1059}
1060
1061static void br_multicast_query_expired(unsigned long data)
1062{
1063 struct net_bridge *br = (void *)data;
1064
1065 spin_lock(&br->multicast_lock);
1066 if (br->multicast_startup_queries_sent <
1067 br->multicast_startup_query_count)
1068 br->multicast_startup_queries_sent++;
1069
1070 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1071
1072 spin_unlock(&br->multicast_lock);
1073}
1074
1075void br_multicast_init(struct net_bridge *br)
1076{
1077 br->hash_elasticity = 4;
1078 br->hash_max = 512;
1079
1080 br->multicast_router = 1;
1081 br->multicast_last_member_count = 2;
1082 br->multicast_startup_query_count = 2;
1083
1084 br->multicast_last_member_interval = HZ;
1085 br->multicast_query_response_interval = 10 * HZ;
1086 br->multicast_startup_query_interval = 125 * HZ / 4;
1087 br->multicast_query_interval = 125 * HZ;
1088 br->multicast_querier_interval = 255 * HZ;
1089 br->multicast_membership_interval = 260 * HZ;
1090
1091 spin_lock_init(&br->multicast_lock);
1092 setup_timer(&br->multicast_router_timer,
1093 br_multicast_local_router_expired, 0);
1094 setup_timer(&br->multicast_querier_timer,
1095 br_multicast_local_router_expired, 0);
1096 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1097 (unsigned long)br);
1098}
1099
1100void br_multicast_open(struct net_bridge *br)
1101{
1102 br->multicast_startup_queries_sent = 0;
1103
1104 if (br->multicast_disabled)
1105 return;
1106
1107 mod_timer(&br->multicast_query_timer, jiffies);
1108}
1109
1110void br_multicast_stop(struct net_bridge *br)
1111{
1112 struct net_bridge_mdb_htable *mdb;
1113 struct net_bridge_mdb_entry *mp;
1114 struct hlist_node *p, *n;
1115 u32 ver;
1116 int i;
1117
1118 del_timer_sync(&br->multicast_router_timer);
1119 del_timer_sync(&br->multicast_querier_timer);
1120 del_timer_sync(&br->multicast_query_timer);
1121
1122 spin_lock_bh(&br->multicast_lock);
1123 mdb = br->mdb;
1124 if (!mdb)
1125 goto out;
1126
1127 br->mdb = NULL;
1128
1129 ver = mdb->ver;
1130 for (i = 0; i < mdb->max; i++) {
1131 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1132 hlist[ver]) {
1133 del_timer(&mp->timer);
1134 del_timer(&mp->query_timer);
1135 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1136 }
1137 }
1138
1139 if (mdb->old) {
1140 spin_unlock_bh(&br->multicast_lock);
10cc2b50 1141 rcu_barrier_bh();
eb1d1641
HX		 1142 spin_lock_bh(&br->multicast_lock);
1143 WARN_ON(mdb->old);
1144 }
1145
1146 mdb->old = mdb;
1147 call_rcu_bh(&mdb->rcu, br_mdb_free);
1148
1149out:
1150 spin_unlock_bh(&br->multicast_lock);
1151}
0909e117
HX		 1152
1153int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1154{
1155 int err = -ENOENT;
1156
1157 spin_lock_bh(&br->multicast_lock);
1158 if (!netif_running(br->dev))
1159 goto unlock;
1160
1161 switch (val) {
1162 case 0:
1163 case 2:
1164 del_timer(&br->multicast_router_timer);
1165 /* fall through */
1166 case 1:
1167 br->multicast_router = val;
1168 err = 0;
1169 break;
1170
1171 default:
1172 err = -EINVAL;
1173 break;
1174 }
1175
1176unlock:
1177 spin_unlock_bh(&br->multicast_lock);
1178
1179 return err;
1180}
1181
1182int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1183{
1184 struct net_bridge *br = p->br;
1185 int err = -ENOENT;
1186
1187 spin_lock(&br->multicast_lock);
1188 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1189 goto unlock;
1190
1191 switch (val) {
1192 case 0:
1193 case 1:
1194 case 2:
1195 p->multicast_router = val;
1196 err = 0;
1197
1198 if (val < 2 && !hlist_unhashed(&p->rlist))
1199 hlist_del_init_rcu(&p->rlist);
1200
1201 if (val == 1)
1202 break;
1203
1204 del_timer(&p->multicast_router_timer);
1205
1206 if (val == 0)
1207 break;
1208
1209 br_multicast_add_router(br, p);
1210 break;
1211
1212 default:
1213 err = -EINVAL;
1214 break;
1215 }
1216
1217unlock:
1218 spin_unlock(&br->multicast_lock);
1219
1220 return err;
1221}
561f1103
HX		 1222
1223int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1224{
1225 struct net_bridge_port *port;
1226 int err = -ENOENT;
1227
1228 spin_lock(&br->multicast_lock);
1229 if (!netif_running(br->dev))
1230 goto unlock;
1231
1232 err = 0;
1233 if (br->multicast_disabled == !val)
1234 goto unlock;
1235
1236 br->multicast_disabled = !val;
1237 if (br->multicast_disabled)
1238 goto unlock;
1239
1240 if (br->mdb) {
1241 if (br->mdb->old) {
1242 err = -EEXIST;
1243rollback:
1244 br->multicast_disabled = !!val;
1245 goto unlock;
1246 }
1247
1248 err = br_mdb_rehash(&br->mdb, br->mdb->max,
1249 br->hash_elasticity);
1250 if (err)
1251 goto rollback;
1252 }
1253
1254 br_multicast_open(br);
1255 list_for_each_entry(port, &br->port_list, list) {
1256 if (port->state == BR_STATE_DISABLED ||
1257 port->state == BR_STATE_BLOCKING)
1258 continue;
1259
1260 __br_multicast_enable_port(port);
1261 }
1262
1263unlock:
1264 spin_unlock(&br->multicast_lock);
1265
1266 return err;
1267}
b195167f
HX		 1268
1269int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1270{
1271 int err = -ENOENT;
1272 u32 old;
1273
1274 spin_lock(&br->multicast_lock);
1275 if (!netif_running(br->dev))
1276 goto unlock;
1277
1278 err = -EINVAL;
1279 if (!is_power_of_2(val))
1280 goto unlock;
1281 if (br->mdb && val < br->mdb->size)
1282 goto unlock;
1283
1284 err = 0;
1285
1286 old = br->hash_max;
1287 br->hash_max = val;
1288
1289 if (br->mdb) {
1290 if (br->mdb->old) {
1291 err = -EEXIST;
1292rollback:
1293 br->hash_max = old;
1294 goto unlock;
1295 }
1296
1297 err = br_mdb_rehash(&br->mdb, br->hash_max,
1298 br->hash_elasticity);
1299 if (err)
1300 goto rollback;
1301 }
1302
1303unlock:
1304 spin_unlock(&br->multicast_lock);
1305
1306 return err;
1307}
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