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Merge tag 'v3.10.98' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bridge / br_multicast.c
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 IS_ENABLED(CONFIG_IPV6)
28 #include <net/ipv6.h>
29 #include <net/mld.h>
30 #include <net/ip6_checksum.h>
31 #endif
32
33 #include "br_private.h"
34
35 static void br_multicast_start_querier(struct net_bridge *br);
36 unsigned int br_mdb_rehash_seq;
37
38 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
39 {
40 if (a->proto != b->proto)
41 return 0;
42 if (a->vid != b->vid)
43 return 0;
44 switch (a->proto) {
45 case htons(ETH_P_IP):
46 return a->u.ip4 == b->u.ip4;
47 #if IS_ENABLED(CONFIG_IPV6)
48 case htons(ETH_P_IPV6):
49 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
50 #endif
51 }
52 return 0;
53 }
54
55 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
56 __u16 vid)
57 {
58 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
59 }
60
61 #if IS_ENABLED(CONFIG_IPV6)
62 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
63 const struct in6_addr *ip,
64 __u16 vid)
65 {
66 return jhash_2words(ipv6_addr_hash(ip), vid,
67 mdb->secret) & (mdb->max - 1);
68 }
69 #endif
70
71 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
72 struct br_ip *ip)
73 {
74 switch (ip->proto) {
75 case htons(ETH_P_IP):
76 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
77 #if IS_ENABLED(CONFIG_IPV6)
78 case htons(ETH_P_IPV6):
79 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
80 #endif
81 }
82 return 0;
83 }
84
85 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
86 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
87 {
88 struct net_bridge_mdb_entry *mp;
89
90 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
91 if (br_ip_equal(&mp->addr, dst))
92 return mp;
93 }
94
95 return NULL;
96 }
97
98 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
99 struct br_ip *dst)
100 {
101 if (!mdb)
102 return NULL;
103
104 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
105 }
106
107 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
108 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
109 {
110 struct br_ip br_dst;
111
112 br_dst.u.ip4 = dst;
113 br_dst.proto = htons(ETH_P_IP);
114 br_dst.vid = vid;
115
116 return br_mdb_ip_get(mdb, &br_dst);
117 }
118
119 #if IS_ENABLED(CONFIG_IPV6)
120 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
121 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
122 __u16 vid)
123 {
124 struct br_ip br_dst;
125
126 br_dst.u.ip6 = *dst;
127 br_dst.proto = htons(ETH_P_IPV6);
128 br_dst.vid = vid;
129
130 return br_mdb_ip_get(mdb, &br_dst);
131 }
132 #endif
133
134 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
135 struct sk_buff *skb, u16 vid)
136 {
137 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
138 struct br_ip ip;
139
140 if (br->multicast_disabled)
141 return NULL;
142
143 if (BR_INPUT_SKB_CB(skb)->igmp)
144 return NULL;
145
146 ip.proto = skb->protocol;
147 ip.vid = vid;
148
149 switch (skb->protocol) {
150 case htons(ETH_P_IP):
151 ip.u.ip4 = ip_hdr(skb)->daddr;
152 break;
153 #if IS_ENABLED(CONFIG_IPV6)
154 case htons(ETH_P_IPV6):
155 ip.u.ip6 = ipv6_hdr(skb)->daddr;
156 break;
157 #endif
158 default:
159 return NULL;
160 }
161
162 return br_mdb_ip_get(mdb, &ip);
163 }
164
165 static void br_mdb_free(struct rcu_head *head)
166 {
167 struct net_bridge_mdb_htable *mdb =
168 container_of(head, struct net_bridge_mdb_htable, rcu);
169 struct net_bridge_mdb_htable *old = mdb->old;
170
171 mdb->old = NULL;
172 kfree(old->mhash);
173 kfree(old);
174 }
175
176 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
177 struct net_bridge_mdb_htable *old,
178 int elasticity)
179 {
180 struct net_bridge_mdb_entry *mp;
181 int maxlen;
182 int len;
183 int i;
184
185 for (i = 0; i < old->max; i++)
186 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
187 hlist_add_head(&mp->hlist[new->ver],
188 &new->mhash[br_ip_hash(new, &mp->addr)]);
189
190 if (!elasticity)
191 return 0;
192
193 maxlen = 0;
194 for (i = 0; i < new->max; i++) {
195 len = 0;
196 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
197 len++;
198 if (len > maxlen)
199 maxlen = len;
200 }
201
202 return maxlen > elasticity ? -EINVAL : 0;
203 }
204
205 void br_multicast_free_pg(struct rcu_head *head)
206 {
207 struct net_bridge_port_group *p =
208 container_of(head, struct net_bridge_port_group, rcu);
209
210 kfree(p);
211 }
212
213 static void br_multicast_free_group(struct rcu_head *head)
214 {
215 struct net_bridge_mdb_entry *mp =
216 container_of(head, struct net_bridge_mdb_entry, rcu);
217
218 kfree(mp);
219 }
220
221 static void br_multicast_group_expired(unsigned long data)
222 {
223 struct net_bridge_mdb_entry *mp = (void *)data;
224 struct net_bridge *br = mp->br;
225 struct net_bridge_mdb_htable *mdb;
226
227 spin_lock(&br->multicast_lock);
228 if (!netif_running(br->dev) || timer_pending(&mp->timer))
229 goto out;
230
231 mp->mglist = false;
232
233 if (mp->ports)
234 goto out;
235
236 mdb = mlock_dereference(br->mdb, br);
237
238 hlist_del_rcu(&mp->hlist[mdb->ver]);
239 mdb->size--;
240
241 call_rcu_bh(&mp->rcu, br_multicast_free_group);
242
243 out:
244 spin_unlock(&br->multicast_lock);
245 }
246
247 static void br_multicast_del_pg(struct net_bridge *br,
248 struct net_bridge_port_group *pg)
249 {
250 struct net_bridge_mdb_htable *mdb;
251 struct net_bridge_mdb_entry *mp;
252 struct net_bridge_port_group *p;
253 struct net_bridge_port_group __rcu **pp;
254
255 mdb = mlock_dereference(br->mdb, br);
256
257 mp = br_mdb_ip_get(mdb, &pg->addr);
258 if (WARN_ON(!mp))
259 return;
260
261 for (pp = &mp->ports;
262 (p = mlock_dereference(*pp, br)) != NULL;
263 pp = &p->next) {
264 if (p != pg)
265 continue;
266
267 rcu_assign_pointer(*pp, p->next);
268 hlist_del_init(&p->mglist);
269 del_timer(&p->timer);
270 call_rcu_bh(&p->rcu, br_multicast_free_pg);
271
272 if (!mp->ports && !mp->mglist &&
273 netif_running(br->dev))
274 mod_timer(&mp->timer, jiffies);
275
276 return;
277 }
278
279 WARN_ON(1);
280 }
281
282 static void br_multicast_port_group_expired(unsigned long data)
283 {
284 struct net_bridge_port_group *pg = (void *)data;
285 struct net_bridge *br = pg->port->br;
286
287 spin_lock(&br->multicast_lock);
288 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
289 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
290 goto out;
291
292 br_multicast_del_pg(br, pg);
293
294 out:
295 spin_unlock(&br->multicast_lock);
296 }
297
298 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
299 int elasticity)
300 {
301 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
302 struct net_bridge_mdb_htable *mdb;
303 int err;
304
305 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
306 if (!mdb)
307 return -ENOMEM;
308
309 mdb->max = max;
310 mdb->old = old;
311
312 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
313 if (!mdb->mhash) {
314 kfree(mdb);
315 return -ENOMEM;
316 }
317
318 mdb->size = old ? old->size : 0;
319 mdb->ver = old ? old->ver ^ 1 : 0;
320
321 if (!old || elasticity)
322 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
323 else
324 mdb->secret = old->secret;
325
326 if (!old)
327 goto out;
328
329 err = br_mdb_copy(mdb, old, elasticity);
330 if (err) {
331 kfree(mdb->mhash);
332 kfree(mdb);
333 return err;
334 }
335
336 br_mdb_rehash_seq++;
337 call_rcu_bh(&mdb->rcu, br_mdb_free);
338
339 out:
340 rcu_assign_pointer(*mdbp, mdb);
341
342 return 0;
343 }
344
345 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
346 __be32 group)
347 {
348 struct sk_buff *skb;
349 struct igmphdr *ih;
350 struct ethhdr *eth;
351 struct iphdr *iph;
352
353 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
354 sizeof(*ih) + 4);
355 if (!skb)
356 goto out;
357
358 skb->protocol = htons(ETH_P_IP);
359
360 skb_reset_mac_header(skb);
361 eth = eth_hdr(skb);
362
363 memcpy(eth->h_source, br->dev->dev_addr, 6);
364 eth->h_dest[0] = 1;
365 eth->h_dest[1] = 0;
366 eth->h_dest[2] = 0x5e;
367 eth->h_dest[3] = 0;
368 eth->h_dest[4] = 0;
369 eth->h_dest[5] = 1;
370 eth->h_proto = htons(ETH_P_IP);
371 skb_put(skb, sizeof(*eth));
372
373 skb_set_network_header(skb, skb->len);
374 iph = ip_hdr(skb);
375
376 iph->version = 4;
377 iph->ihl = 6;
378 iph->tos = 0xc0;
379 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
380 iph->id = 0;
381 iph->frag_off = htons(IP_DF);
382 iph->ttl = 1;
383 iph->protocol = IPPROTO_IGMP;
384 iph->saddr = 0;
385 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
386 ((u8 *)&iph[1])[0] = IPOPT_RA;
387 ((u8 *)&iph[1])[1] = 4;
388 ((u8 *)&iph[1])[2] = 0;
389 ((u8 *)&iph[1])[3] = 0;
390 ip_send_check(iph);
391 skb_put(skb, 24);
392
393 skb_set_transport_header(skb, skb->len);
394 ih = igmp_hdr(skb);
395 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
396 ih->code = (group ? br->multicast_last_member_interval :
397 br->multicast_query_response_interval) /
398 (HZ / IGMP_TIMER_SCALE);
399 ih->group = group;
400 ih->csum = 0;
401 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
402 skb_put(skb, sizeof(*ih));
403
404 __skb_pull(skb, sizeof(*eth));
405
406 out:
407 return skb;
408 }
409
410 #if IS_ENABLED(CONFIG_IPV6)
411 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
412 const struct in6_addr *group)
413 {
414 struct sk_buff *skb;
415 struct ipv6hdr *ip6h;
416 struct mld_msg *mldq;
417 struct ethhdr *eth;
418 u8 *hopopt;
419 unsigned long interval;
420
421 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
422 8 + sizeof(*mldq));
423 if (!skb)
424 goto out;
425
426 skb->protocol = htons(ETH_P_IPV6);
427
428 /* Ethernet header */
429 skb_reset_mac_header(skb);
430 eth = eth_hdr(skb);
431
432 memcpy(eth->h_source, br->dev->dev_addr, 6);
433 eth->h_proto = htons(ETH_P_IPV6);
434 skb_put(skb, sizeof(*eth));
435
436 /* IPv6 header + HbH option */
437 skb_set_network_header(skb, skb->len);
438 ip6h = ipv6_hdr(skb);
439
440 *(__force __be32 *)ip6h = htonl(0x60000000);
441 ip6h->payload_len = htons(8 + sizeof(*mldq));
442 ip6h->nexthdr = IPPROTO_HOPOPTS;
443 ip6h->hop_limit = 1;
444 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
445 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
446 &ip6h->saddr)) {
447 kfree_skb(skb);
448 return NULL;
449 }
450 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
451
452 hopopt = (u8 *)(ip6h + 1);
453 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
454 hopopt[1] = 0; /* length of HbH */
455 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
456 hopopt[3] = 2; /* Length of RA Option */
457 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
458 hopopt[5] = 0;
459 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
460 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
461
462 skb_put(skb, sizeof(*ip6h) + 8);
463
464 /* ICMPv6 */
465 skb_set_transport_header(skb, skb->len);
466 mldq = (struct mld_msg *) icmp6_hdr(skb);
467
468 interval = ipv6_addr_any(group) ?
469 br->multicast_query_response_interval :
470 br->multicast_last_member_interval;
471
472 mldq->mld_type = ICMPV6_MGM_QUERY;
473 mldq->mld_code = 0;
474 mldq->mld_cksum = 0;
475 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
476 mldq->mld_reserved = 0;
477 mldq->mld_mca = *group;
478
479 /* checksum */
480 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
481 sizeof(*mldq), IPPROTO_ICMPV6,
482 csum_partial(mldq,
483 sizeof(*mldq), 0));
484 skb_put(skb, sizeof(*mldq));
485
486 __skb_pull(skb, sizeof(*eth));
487
488 out:
489 return skb;
490 }
491 #endif
492
493 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
494 struct br_ip *addr)
495 {
496 switch (addr->proto) {
497 case htons(ETH_P_IP):
498 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
499 #if IS_ENABLED(CONFIG_IPV6)
500 case htons(ETH_P_IPV6):
501 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
502 #endif
503 }
504 return NULL;
505 }
506
507 static struct net_bridge_mdb_entry *br_multicast_get_group(
508 struct net_bridge *br, struct net_bridge_port *port,
509 struct br_ip *group, int hash)
510 {
511 struct net_bridge_mdb_htable *mdb;
512 struct net_bridge_mdb_entry *mp;
513 unsigned int count = 0;
514 unsigned int max;
515 int elasticity;
516 int err;
517
518 mdb = rcu_dereference_protected(br->mdb, 1);
519 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
520 count++;
521 if (unlikely(br_ip_equal(group, &mp->addr)))
522 return mp;
523 }
524
525 elasticity = 0;
526 max = mdb->max;
527
528 if (unlikely(count > br->hash_elasticity && count)) {
529 if (net_ratelimit())
530 br_info(br, "Multicast hash table "
531 "chain limit reached: %s\n",
532 port ? port->dev->name : br->dev->name);
533
534 elasticity = br->hash_elasticity;
535 }
536
537 if (mdb->size >= max) {
538 max *= 2;
539 if (unlikely(max > br->hash_max)) {
540 br_warn(br, "Multicast hash table maximum of %d "
541 "reached, disabling snooping: %s\n",
542 br->hash_max,
543 port ? port->dev->name : br->dev->name);
544 err = -E2BIG;
545 disable:
546 br->multicast_disabled = 1;
547 goto err;
548 }
549 }
550
551 if (max > mdb->max || elasticity) {
552 if (mdb->old) {
553 if (net_ratelimit())
554 br_info(br, "Multicast hash table "
555 "on fire: %s\n",
556 port ? port->dev->name : br->dev->name);
557 err = -EEXIST;
558 goto err;
559 }
560
561 err = br_mdb_rehash(&br->mdb, max, elasticity);
562 if (err) {
563 br_warn(br, "Cannot rehash multicast "
564 "hash table, disabling snooping: %s, %d, %d\n",
565 port ? port->dev->name : br->dev->name,
566 mdb->size, err);
567 goto disable;
568 }
569
570 err = -EAGAIN;
571 goto err;
572 }
573
574 return NULL;
575
576 err:
577 mp = ERR_PTR(err);
578 return mp;
579 }
580
581 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
582 struct net_bridge_port *port, struct br_ip *group)
583 {
584 struct net_bridge_mdb_htable *mdb;
585 struct net_bridge_mdb_entry *mp;
586 int hash;
587 int err;
588
589 mdb = rcu_dereference_protected(br->mdb, 1);
590 if (!mdb) {
591 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
592 if (err)
593 return ERR_PTR(err);
594 goto rehash;
595 }
596
597 hash = br_ip_hash(mdb, group);
598 mp = br_multicast_get_group(br, port, group, hash);
599 switch (PTR_ERR(mp)) {
600 case 0:
601 break;
602
603 case -EAGAIN:
604 rehash:
605 mdb = rcu_dereference_protected(br->mdb, 1);
606 hash = br_ip_hash(mdb, group);
607 break;
608
609 default:
610 goto out;
611 }
612
613 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
614 if (unlikely(!mp))
615 return ERR_PTR(-ENOMEM);
616
617 mp->br = br;
618 mp->addr = *group;
619 setup_timer(&mp->timer, br_multicast_group_expired,
620 (unsigned long)mp);
621
622 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
623 mdb->size++;
624
625 out:
626 return mp;
627 }
628
629 struct net_bridge_port_group *br_multicast_new_port_group(
630 struct net_bridge_port *port,
631 struct br_ip *group,
632 struct net_bridge_port_group __rcu *next,
633 unsigned char state)
634 {
635 struct net_bridge_port_group *p;
636
637 p = kzalloc(sizeof(*p), GFP_ATOMIC);
638 if (unlikely(!p))
639 return NULL;
640
641 p->addr = *group;
642 p->port = port;
643 p->state = state;
644 rcu_assign_pointer(p->next, next);
645 hlist_add_head(&p->mglist, &port->mglist);
646 setup_timer(&p->timer, br_multicast_port_group_expired,
647 (unsigned long)p);
648 return p;
649 }
650
651 static int br_multicast_add_group(struct net_bridge *br,
652 struct net_bridge_port *port,
653 struct br_ip *group)
654 {
655 struct net_bridge_mdb_entry *mp;
656 struct net_bridge_port_group *p;
657 struct net_bridge_port_group __rcu **pp;
658 unsigned long now = jiffies;
659 int err;
660
661 spin_lock(&br->multicast_lock);
662 if (!netif_running(br->dev) ||
663 (port && port->state == BR_STATE_DISABLED))
664 goto out;
665
666 mp = br_multicast_new_group(br, port, group);
667 err = PTR_ERR(mp);
668 if (IS_ERR(mp))
669 goto err;
670
671 if (!port) {
672 mp->mglist = true;
673 mod_timer(&mp->timer, now + br->multicast_membership_interval);
674 goto out;
675 }
676
677 for (pp = &mp->ports;
678 (p = mlock_dereference(*pp, br)) != NULL;
679 pp = &p->next) {
680 if (p->port == port)
681 goto found;
682 if ((unsigned long)p->port < (unsigned long)port)
683 break;
684 }
685
686 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
687 if (unlikely(!p))
688 goto err;
689 rcu_assign_pointer(*pp, p);
690 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
691
692 found:
693 mod_timer(&p->timer, now + br->multicast_membership_interval);
694 out:
695 err = 0;
696
697 err:
698 spin_unlock(&br->multicast_lock);
699 return err;
700 }
701
702 static int br_ip4_multicast_add_group(struct net_bridge *br,
703 struct net_bridge_port *port,
704 __be32 group,
705 __u16 vid)
706 {
707 struct br_ip br_group;
708
709 if (ipv4_is_local_multicast(group))
710 return 0;
711
712 br_group.u.ip4 = group;
713 br_group.proto = htons(ETH_P_IP);
714 br_group.vid = vid;
715
716 return br_multicast_add_group(br, port, &br_group);
717 }
718
719 #if IS_ENABLED(CONFIG_IPV6)
720 static int br_ip6_multicast_add_group(struct net_bridge *br,
721 struct net_bridge_port *port,
722 const struct in6_addr *group,
723 __u16 vid)
724 {
725 struct br_ip br_group;
726
727 if (!ipv6_is_transient_multicast(group))
728 return 0;
729
730 br_group.u.ip6 = *group;
731 br_group.proto = htons(ETH_P_IPV6);
732 br_group.vid = vid;
733
734 return br_multicast_add_group(br, port, &br_group);
735 }
736 #endif
737
738 static void br_multicast_router_expired(unsigned long data)
739 {
740 struct net_bridge_port *port = (void *)data;
741 struct net_bridge *br = port->br;
742
743 spin_lock(&br->multicast_lock);
744 if (port->multicast_router != 1 ||
745 timer_pending(&port->multicast_router_timer) ||
746 hlist_unhashed(&port->rlist))
747 goto out;
748
749 hlist_del_init_rcu(&port->rlist);
750
751 out:
752 spin_unlock(&br->multicast_lock);
753 }
754
755 static void br_multicast_local_router_expired(unsigned long data)
756 {
757 }
758
759 static void br_multicast_querier_expired(unsigned long data)
760 {
761 struct net_bridge *br = (void *)data;
762
763 spin_lock(&br->multicast_lock);
764 if (!netif_running(br->dev) || br->multicast_disabled)
765 goto out;
766
767 br_multicast_start_querier(br);
768
769 out:
770 spin_unlock(&br->multicast_lock);
771 }
772
773 static void __br_multicast_send_query(struct net_bridge *br,
774 struct net_bridge_port *port,
775 struct br_ip *ip)
776 {
777 struct sk_buff *skb;
778
779 skb = br_multicast_alloc_query(br, ip);
780 if (!skb)
781 return;
782
783 if (port) {
784 __skb_push(skb, sizeof(struct ethhdr));
785 skb->dev = port->dev;
786 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
787 dev_queue_xmit);
788 } else
789 netif_rx(skb);
790 }
791
792 static void br_multicast_send_query(struct net_bridge *br,
793 struct net_bridge_port *port, u32 sent)
794 {
795 unsigned long time;
796 struct br_ip br_group;
797
798 if (!netif_running(br->dev) || br->multicast_disabled ||
799 !br->multicast_querier ||
800 timer_pending(&br->multicast_querier_timer))
801 return;
802
803 memset(&br_group.u, 0, sizeof(br_group.u));
804
805 br_group.proto = htons(ETH_P_IP);
806 __br_multicast_send_query(br, port, &br_group);
807
808 #if IS_ENABLED(CONFIG_IPV6)
809 br_group.proto = htons(ETH_P_IPV6);
810 __br_multicast_send_query(br, port, &br_group);
811 #endif
812
813 time = jiffies;
814 time += sent < br->multicast_startup_query_count ?
815 br->multicast_startup_query_interval :
816 br->multicast_query_interval;
817 mod_timer(port ? &port->multicast_query_timer :
818 &br->multicast_query_timer, time);
819 }
820
821 static void br_multicast_port_query_expired(unsigned long data)
822 {
823 struct net_bridge_port *port = (void *)data;
824 struct net_bridge *br = port->br;
825
826 spin_lock(&br->multicast_lock);
827 if (port->state == BR_STATE_DISABLED ||
828 port->state == BR_STATE_BLOCKING)
829 goto out;
830
831 if (port->multicast_startup_queries_sent <
832 br->multicast_startup_query_count)
833 port->multicast_startup_queries_sent++;
834
835 br_multicast_send_query(port->br, port,
836 port->multicast_startup_queries_sent);
837
838 out:
839 spin_unlock(&br->multicast_lock);
840 }
841
842 void br_multicast_add_port(struct net_bridge_port *port)
843 {
844 port->multicast_router = 1;
845
846 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
847 (unsigned long)port);
848 setup_timer(&port->multicast_query_timer,
849 br_multicast_port_query_expired, (unsigned long)port);
850 }
851
852 void br_multicast_del_port(struct net_bridge_port *port)
853 {
854 del_timer_sync(&port->multicast_router_timer);
855 }
856
857 static void __br_multicast_enable_port(struct net_bridge_port *port)
858 {
859 port->multicast_startup_queries_sent = 0;
860
861 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
862 del_timer(&port->multicast_query_timer))
863 mod_timer(&port->multicast_query_timer, jiffies);
864 }
865
866 void br_multicast_enable_port(struct net_bridge_port *port)
867 {
868 struct net_bridge *br = port->br;
869
870 spin_lock(&br->multicast_lock);
871 if (br->multicast_disabled || !netif_running(br->dev))
872 goto out;
873
874 __br_multicast_enable_port(port);
875
876 out:
877 spin_unlock(&br->multicast_lock);
878 }
879
880 void br_multicast_disable_port(struct net_bridge_port *port)
881 {
882 struct net_bridge *br = port->br;
883 struct net_bridge_port_group *pg;
884 struct hlist_node *n;
885
886 spin_lock(&br->multicast_lock);
887 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
888 br_multicast_del_pg(br, pg);
889
890 if (!hlist_unhashed(&port->rlist))
891 hlist_del_init_rcu(&port->rlist);
892 del_timer(&port->multicast_router_timer);
893 del_timer(&port->multicast_query_timer);
894 spin_unlock(&br->multicast_lock);
895 }
896
897 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
898 struct net_bridge_port *port,
899 struct sk_buff *skb)
900 {
901 struct igmpv3_report *ih;
902 struct igmpv3_grec *grec;
903 int i;
904 int len;
905 int num;
906 int type;
907 int err = 0;
908 __be32 group;
909 u16 vid = 0;
910
911 if (!pskb_may_pull(skb, sizeof(*ih)))
912 return -EINVAL;
913
914 br_vlan_get_tag(skb, &vid);
915 ih = igmpv3_report_hdr(skb);
916 num = ntohs(ih->ngrec);
917 len = sizeof(*ih);
918
919 for (i = 0; i < num; i++) {
920 len += sizeof(*grec);
921 if (!pskb_may_pull(skb, len))
922 return -EINVAL;
923
924 grec = (void *)(skb->data + len - sizeof(*grec));
925 group = grec->grec_mca;
926 type = grec->grec_type;
927
928 len += ntohs(grec->grec_nsrcs) * 4;
929 if (!pskb_may_pull(skb, len))
930 return -EINVAL;
931
932 /* We treat this as an IGMPv2 report for now. */
933 switch (type) {
934 case IGMPV3_MODE_IS_INCLUDE:
935 case IGMPV3_MODE_IS_EXCLUDE:
936 case IGMPV3_CHANGE_TO_INCLUDE:
937 case IGMPV3_CHANGE_TO_EXCLUDE:
938 case IGMPV3_ALLOW_NEW_SOURCES:
939 case IGMPV3_BLOCK_OLD_SOURCES:
940 break;
941
942 default:
943 continue;
944 }
945
946 err = br_ip4_multicast_add_group(br, port, group, vid);
947 if (err)
948 break;
949 }
950
951 return err;
952 }
953
954 #if IS_ENABLED(CONFIG_IPV6)
955 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
956 struct net_bridge_port *port,
957 struct sk_buff *skb)
958 {
959 struct icmp6hdr *icmp6h;
960 struct mld2_grec *grec;
961 int i;
962 int len;
963 int num;
964 int err = 0;
965 u16 vid = 0;
966
967 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
968 return -EINVAL;
969
970 br_vlan_get_tag(skb, &vid);
971 icmp6h = icmp6_hdr(skb);
972 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
973 len = sizeof(*icmp6h);
974
975 for (i = 0; i < num; i++) {
976 __be16 *nsrcs, _nsrcs;
977
978 nsrcs = skb_header_pointer(skb,
979 len + offsetof(struct mld2_grec,
980 grec_nsrcs),
981 sizeof(_nsrcs), &_nsrcs);
982 if (!nsrcs)
983 return -EINVAL;
984
985 if (!pskb_may_pull(skb,
986 len + sizeof(*grec) +
987 sizeof(struct in6_addr) * ntohs(*nsrcs)))
988 return -EINVAL;
989
990 grec = (struct mld2_grec *)(skb->data + len);
991 len += sizeof(*grec) +
992 sizeof(struct in6_addr) * ntohs(*nsrcs);
993
994 /* We treat these as MLDv1 reports for now. */
995 switch (grec->grec_type) {
996 case MLD2_MODE_IS_INCLUDE:
997 case MLD2_MODE_IS_EXCLUDE:
998 case MLD2_CHANGE_TO_INCLUDE:
999 case MLD2_CHANGE_TO_EXCLUDE:
1000 case MLD2_ALLOW_NEW_SOURCES:
1001 case MLD2_BLOCK_OLD_SOURCES:
1002 break;
1003
1004 default:
1005 continue;
1006 }
1007
1008 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1009 vid);
1010 if (err)
1011 break;
1012 }
1013
1014 return err;
1015 }
1016 #endif
1017
1018 /*
1019 * Add port to rotuer_list
1020 * list is maintained ordered by pointer value
1021 * and locked by br->multicast_lock and RCU
1022 */
1023 static void br_multicast_add_router(struct net_bridge *br,
1024 struct net_bridge_port *port)
1025 {
1026 struct net_bridge_port *p;
1027 struct hlist_node *slot = NULL;
1028
1029 if (!hlist_unhashed(&port->rlist))
1030 return;
1031
1032 hlist_for_each_entry(p, &br->router_list, rlist) {
1033 if ((unsigned long) port >= (unsigned long) p)
1034 break;
1035 slot = &p->rlist;
1036 }
1037
1038 if (slot)
1039 hlist_add_after_rcu(slot, &port->rlist);
1040 else
1041 hlist_add_head_rcu(&port->rlist, &br->router_list);
1042 }
1043
1044 static void br_multicast_mark_router(struct net_bridge *br,
1045 struct net_bridge_port *port)
1046 {
1047 unsigned long now = jiffies;
1048
1049 if (!port) {
1050 if (br->multicast_router == 1)
1051 mod_timer(&br->multicast_router_timer,
1052 now + br->multicast_querier_interval);
1053 return;
1054 }
1055
1056 if (port->multicast_router != 1)
1057 return;
1058
1059 br_multicast_add_router(br, port);
1060
1061 mod_timer(&port->multicast_router_timer,
1062 now + br->multicast_querier_interval);
1063 }
1064
1065 static void br_multicast_query_received(struct net_bridge *br,
1066 struct net_bridge_port *port,
1067 int saddr)
1068 {
1069 if (saddr)
1070 mod_timer(&br->multicast_querier_timer,
1071 jiffies + br->multicast_querier_interval);
1072 else if (timer_pending(&br->multicast_querier_timer))
1073 return;
1074
1075 br_multicast_mark_router(br, port);
1076 }
1077
1078 static int br_ip4_multicast_query(struct net_bridge *br,
1079 struct net_bridge_port *port,
1080 struct sk_buff *skb)
1081 {
1082 const struct iphdr *iph = ip_hdr(skb);
1083 struct igmphdr *ih = igmp_hdr(skb);
1084 struct net_bridge_mdb_entry *mp;
1085 struct igmpv3_query *ih3;
1086 struct net_bridge_port_group *p;
1087 struct net_bridge_port_group __rcu **pp;
1088 unsigned long max_delay;
1089 unsigned long now = jiffies;
1090 __be32 group;
1091 int err = 0;
1092 u16 vid = 0;
1093
1094 spin_lock(&br->multicast_lock);
1095 if (!netif_running(br->dev) ||
1096 (port && port->state == BR_STATE_DISABLED))
1097 goto out;
1098
1099 br_multicast_query_received(br, port, !!iph->saddr);
1100
1101 group = ih->group;
1102
1103 if (skb->len == sizeof(*ih)) {
1104 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1105
1106 if (!max_delay) {
1107 max_delay = 10 * HZ;
1108 group = 0;
1109 }
1110 } else {
1111 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1112 err = -EINVAL;
1113 goto out;
1114 }
1115
1116 ih3 = igmpv3_query_hdr(skb);
1117 if (ih3->nsrcs)
1118 goto out;
1119
1120 max_delay = ih3->code ?
1121 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1122 }
1123
1124 if (!group)
1125 goto out;
1126
1127 br_vlan_get_tag(skb, &vid);
1128 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1129 if (!mp)
1130 goto out;
1131
1132 max_delay *= br->multicast_last_member_count;
1133
1134 if (mp->mglist &&
1135 (timer_pending(&mp->timer) ?
1136 time_after(mp->timer.expires, now + max_delay) :
1137 try_to_del_timer_sync(&mp->timer) >= 0))
1138 mod_timer(&mp->timer, now + max_delay);
1139
1140 for (pp = &mp->ports;
1141 (p = mlock_dereference(*pp, br)) != NULL;
1142 pp = &p->next) {
1143 if (timer_pending(&p->timer) ?
1144 time_after(p->timer.expires, now + max_delay) :
1145 try_to_del_timer_sync(&p->timer) >= 0)
1146 mod_timer(&p->timer, now + max_delay);
1147 }
1148
1149 out:
1150 spin_unlock(&br->multicast_lock);
1151 return err;
1152 }
1153
1154 #if IS_ENABLED(CONFIG_IPV6)
1155 static int br_ip6_multicast_query(struct net_bridge *br,
1156 struct net_bridge_port *port,
1157 struct sk_buff *skb)
1158 {
1159 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1160 struct mld_msg *mld;
1161 struct net_bridge_mdb_entry *mp;
1162 struct mld2_query *mld2q;
1163 struct net_bridge_port_group *p;
1164 struct net_bridge_port_group __rcu **pp;
1165 unsigned long max_delay;
1166 unsigned long now = jiffies;
1167 const struct in6_addr *group = NULL;
1168 int err = 0;
1169 u16 vid = 0;
1170
1171 spin_lock(&br->multicast_lock);
1172 if (!netif_running(br->dev) ||
1173 (port && port->state == BR_STATE_DISABLED))
1174 goto out;
1175
1176 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1177
1178 /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
1179 if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1180 err = -EINVAL;
1181 goto out;
1182 }
1183
1184 if (skb->len == sizeof(*mld)) {
1185 if (!pskb_may_pull(skb, sizeof(*mld))) {
1186 err = -EINVAL;
1187 goto out;
1188 }
1189 mld = (struct mld_msg *) icmp6_hdr(skb);
1190 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1191 if (max_delay)
1192 group = &mld->mld_mca;
1193 } else {
1194 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1195 err = -EINVAL;
1196 goto out;
1197 }
1198 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1199 if (!mld2q->mld2q_nsrcs)
1200 group = &mld2q->mld2q_mca;
1201
1202 max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mld2q->mld2q_mrc))), 1UL);
1203 }
1204
1205 if (!group)
1206 goto out;
1207
1208 br_vlan_get_tag(skb, &vid);
1209 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1210 if (!mp)
1211 goto out;
1212
1213 max_delay *= br->multicast_last_member_count;
1214 if (mp->mglist &&
1215 (timer_pending(&mp->timer) ?
1216 time_after(mp->timer.expires, now + max_delay) :
1217 try_to_del_timer_sync(&mp->timer) >= 0))
1218 mod_timer(&mp->timer, now + max_delay);
1219
1220 for (pp = &mp->ports;
1221 (p = mlock_dereference(*pp, br)) != NULL;
1222 pp = &p->next) {
1223 if (timer_pending(&p->timer) ?
1224 time_after(p->timer.expires, now + max_delay) :
1225 try_to_del_timer_sync(&p->timer) >= 0)
1226 mod_timer(&p->timer, now + max_delay);
1227 }
1228
1229 out:
1230 spin_unlock(&br->multicast_lock);
1231 return err;
1232 }
1233 #endif
1234
1235 static void br_multicast_leave_group(struct net_bridge *br,
1236 struct net_bridge_port *port,
1237 struct br_ip *group)
1238 {
1239 struct net_bridge_mdb_htable *mdb;
1240 struct net_bridge_mdb_entry *mp;
1241 struct net_bridge_port_group *p;
1242 unsigned long now;
1243 unsigned long time;
1244
1245 spin_lock(&br->multicast_lock);
1246 if (!netif_running(br->dev) ||
1247 (port && port->state == BR_STATE_DISABLED) ||
1248 timer_pending(&br->multicast_querier_timer))
1249 goto out;
1250
1251 mdb = mlock_dereference(br->mdb, br);
1252 mp = br_mdb_ip_get(mdb, group);
1253 if (!mp)
1254 goto out;
1255
1256 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1257 struct net_bridge_port_group __rcu **pp;
1258
1259 for (pp = &mp->ports;
1260 (p = mlock_dereference(*pp, br)) != NULL;
1261 pp = &p->next) {
1262 if (p->port != port)
1263 continue;
1264
1265 rcu_assign_pointer(*pp, p->next);
1266 hlist_del_init(&p->mglist);
1267 del_timer(&p->timer);
1268 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1269 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1270
1271 if (!mp->ports && !mp->mglist &&
1272 netif_running(br->dev))
1273 mod_timer(&mp->timer, jiffies);
1274 }
1275 goto out;
1276 }
1277
1278 now = jiffies;
1279 time = now + br->multicast_last_member_count *
1280 br->multicast_last_member_interval;
1281
1282 if (!port) {
1283 if (mp->mglist &&
1284 (timer_pending(&mp->timer) ?
1285 time_after(mp->timer.expires, time) :
1286 try_to_del_timer_sync(&mp->timer) >= 0)) {
1287 mod_timer(&mp->timer, time);
1288 }
1289
1290 goto out;
1291 }
1292
1293 for (p = mlock_dereference(mp->ports, br);
1294 p != NULL;
1295 p = mlock_dereference(p->next, br)) {
1296 if (p->port != port)
1297 continue;
1298
1299 if (!hlist_unhashed(&p->mglist) &&
1300 (timer_pending(&p->timer) ?
1301 time_after(p->timer.expires, time) :
1302 try_to_del_timer_sync(&p->timer) >= 0)) {
1303 mod_timer(&p->timer, time);
1304 }
1305
1306 break;
1307 }
1308
1309 out:
1310 spin_unlock(&br->multicast_lock);
1311 }
1312
1313 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1314 struct net_bridge_port *port,
1315 __be32 group,
1316 __u16 vid)
1317 {
1318 struct br_ip br_group;
1319
1320 if (ipv4_is_local_multicast(group))
1321 return;
1322
1323 br_group.u.ip4 = group;
1324 br_group.proto = htons(ETH_P_IP);
1325 br_group.vid = vid;
1326
1327 br_multicast_leave_group(br, port, &br_group);
1328 }
1329
1330 #if IS_ENABLED(CONFIG_IPV6)
1331 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1332 struct net_bridge_port *port,
1333 const struct in6_addr *group,
1334 __u16 vid)
1335 {
1336 struct br_ip br_group;
1337
1338 if (!ipv6_is_transient_multicast(group))
1339 return;
1340
1341 br_group.u.ip6 = *group;
1342 br_group.proto = htons(ETH_P_IPV6);
1343 br_group.vid = vid;
1344
1345 br_multicast_leave_group(br, port, &br_group);
1346 }
1347 #endif
1348
1349 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1350 struct net_bridge_port *port,
1351 struct sk_buff *skb)
1352 {
1353 struct sk_buff *skb2 = skb;
1354 const struct iphdr *iph;
1355 struct igmphdr *ih;
1356 unsigned int len;
1357 unsigned int offset;
1358 int err;
1359 u16 vid = 0;
1360
1361 /* We treat OOM as packet loss for now. */
1362 if (!pskb_may_pull(skb, sizeof(*iph)))
1363 return -EINVAL;
1364
1365 iph = ip_hdr(skb);
1366
1367 if (iph->ihl < 5 || iph->version != 4)
1368 return -EINVAL;
1369
1370 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1371 return -EINVAL;
1372
1373 iph = ip_hdr(skb);
1374
1375 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1376 return -EINVAL;
1377
1378 if (iph->protocol != IPPROTO_IGMP) {
1379 if (!ipv4_is_local_multicast(iph->daddr))
1380 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1381 return 0;
1382 }
1383
1384 len = ntohs(iph->tot_len);
1385 if (skb->len < len || len < ip_hdrlen(skb))
1386 return -EINVAL;
1387
1388 if (skb->len > len) {
1389 skb2 = skb_clone(skb, GFP_ATOMIC);
1390 if (!skb2)
1391 return -ENOMEM;
1392
1393 err = pskb_trim_rcsum(skb2, len);
1394 if (err)
1395 goto err_out;
1396 }
1397
1398 len -= ip_hdrlen(skb2);
1399 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1400 __skb_pull(skb2, offset);
1401 skb_reset_transport_header(skb2);
1402
1403 err = -EINVAL;
1404 if (!pskb_may_pull(skb2, sizeof(*ih)))
1405 goto out;
1406
1407 switch (skb2->ip_summed) {
1408 case CHECKSUM_COMPLETE:
1409 if (!csum_fold(skb2->csum))
1410 break;
1411 /* fall through */
1412 case CHECKSUM_NONE:
1413 skb2->csum = 0;
1414 if (skb_checksum_complete(skb2))
1415 goto out;
1416 }
1417
1418 err = 0;
1419
1420 br_vlan_get_tag(skb2, &vid);
1421 BR_INPUT_SKB_CB(skb)->igmp = 1;
1422 ih = igmp_hdr(skb2);
1423
1424 switch (ih->type) {
1425 case IGMP_HOST_MEMBERSHIP_REPORT:
1426 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1427 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1428 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1429 break;
1430 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1431 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1432 break;
1433 case IGMP_HOST_MEMBERSHIP_QUERY:
1434 err = br_ip4_multicast_query(br, port, skb2);
1435 break;
1436 case IGMP_HOST_LEAVE_MESSAGE:
1437 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1438 break;
1439 }
1440
1441 out:
1442 __skb_push(skb2, offset);
1443 err_out:
1444 if (skb2 != skb)
1445 kfree_skb(skb2);
1446 return err;
1447 }
1448
1449 #if IS_ENABLED(CONFIG_IPV6)
1450 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1451 struct net_bridge_port *port,
1452 struct sk_buff *skb)
1453 {
1454 struct sk_buff *skb2;
1455 const struct ipv6hdr *ip6h;
1456 u8 icmp6_type;
1457 u8 nexthdr;
1458 __be16 frag_off;
1459 unsigned int len;
1460 int offset;
1461 int err;
1462 u16 vid = 0;
1463
1464 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1465 return -EINVAL;
1466
1467 ip6h = ipv6_hdr(skb);
1468
1469 /*
1470 * We're interested in MLD messages only.
1471 * - Version is 6
1472 * - MLD has always Router Alert hop-by-hop option
1473 * - But we do not support jumbrograms.
1474 */
1475 if (ip6h->version != 6 ||
1476 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1477 ip6h->payload_len == 0)
1478 return 0;
1479
1480 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1481 if (skb->len < len)
1482 return -EINVAL;
1483
1484 nexthdr = ip6h->nexthdr;
1485 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1486
1487 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1488 return 0;
1489
1490 /* Okay, we found ICMPv6 header */
1491 skb2 = skb_clone(skb, GFP_ATOMIC);
1492 if (!skb2)
1493 return -ENOMEM;
1494
1495 err = -EINVAL;
1496 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1497 goto out;
1498
1499 len -= offset - skb_network_offset(skb2);
1500
1501 __skb_pull(skb2, offset);
1502 skb_reset_transport_header(skb2);
1503 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1504 skb_network_header_len(skb2));
1505
1506 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1507
1508 switch (icmp6_type) {
1509 case ICMPV6_MGM_QUERY:
1510 case ICMPV6_MGM_REPORT:
1511 case ICMPV6_MGM_REDUCTION:
1512 case ICMPV6_MLD2_REPORT:
1513 break;
1514 default:
1515 err = 0;
1516 goto out;
1517 }
1518
1519 /* Okay, we found MLD message. Check further. */
1520 if (skb2->len > len) {
1521 err = pskb_trim_rcsum(skb2, len);
1522 if (err)
1523 goto out;
1524 err = -EINVAL;
1525 }
1526
1527 ip6h = ipv6_hdr(skb2);
1528
1529 switch (skb2->ip_summed) {
1530 case CHECKSUM_COMPLETE:
1531 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1532 IPPROTO_ICMPV6, skb2->csum))
1533 break;
1534 /*FALLTHROUGH*/
1535 case CHECKSUM_NONE:
1536 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1537 &ip6h->daddr,
1538 skb2->len,
1539 IPPROTO_ICMPV6, 0));
1540 if (__skb_checksum_complete(skb2))
1541 goto out;
1542 }
1543
1544 err = 0;
1545
1546 br_vlan_get_tag(skb, &vid);
1547 BR_INPUT_SKB_CB(skb)->igmp = 1;
1548
1549 switch (icmp6_type) {
1550 case ICMPV6_MGM_REPORT:
1551 {
1552 struct mld_msg *mld;
1553 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1554 err = -EINVAL;
1555 goto out;
1556 }
1557 mld = (struct mld_msg *)skb_transport_header(skb2);
1558 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1559 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1560 break;
1561 }
1562 case ICMPV6_MLD2_REPORT:
1563 err = br_ip6_multicast_mld2_report(br, port, skb2);
1564 break;
1565 case ICMPV6_MGM_QUERY:
1566 err = br_ip6_multicast_query(br, port, skb2);
1567 break;
1568 case ICMPV6_MGM_REDUCTION:
1569 {
1570 struct mld_msg *mld;
1571 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1572 err = -EINVAL;
1573 goto out;
1574 }
1575 mld = (struct mld_msg *)skb_transport_header(skb2);
1576 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1577 }
1578 }
1579
1580 out:
1581 kfree_skb(skb2);
1582 return err;
1583 }
1584 #endif
1585
1586 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1587 struct sk_buff *skb)
1588 {
1589 BR_INPUT_SKB_CB(skb)->igmp = 0;
1590 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1591
1592 if (br->multicast_disabled)
1593 return 0;
1594
1595 switch (skb->protocol) {
1596 case htons(ETH_P_IP):
1597 return br_multicast_ipv4_rcv(br, port, skb);
1598 #if IS_ENABLED(CONFIG_IPV6)
1599 case htons(ETH_P_IPV6):
1600 return br_multicast_ipv6_rcv(br, port, skb);
1601 #endif
1602 }
1603
1604 return 0;
1605 }
1606
1607 static void br_multicast_query_expired(unsigned long data)
1608 {
1609 struct net_bridge *br = (void *)data;
1610
1611 spin_lock(&br->multicast_lock);
1612 if (br->multicast_startup_queries_sent <
1613 br->multicast_startup_query_count)
1614 br->multicast_startup_queries_sent++;
1615
1616 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1617
1618 spin_unlock(&br->multicast_lock);
1619 }
1620
1621 void br_multicast_init(struct net_bridge *br)
1622 {
1623 br->hash_elasticity = 4;
1624 br->hash_max = 512;
1625
1626 br->multicast_router = 1;
1627 br->multicast_querier = 0;
1628 br->multicast_last_member_count = 2;
1629 br->multicast_startup_query_count = 2;
1630
1631 br->multicast_last_member_interval = HZ;
1632 br->multicast_query_response_interval = 10 * HZ;
1633 br->multicast_startup_query_interval = 125 * HZ / 4;
1634 br->multicast_query_interval = 125 * HZ;
1635 br->multicast_querier_interval = 255 * HZ;
1636 br->multicast_membership_interval = 260 * HZ;
1637
1638 spin_lock_init(&br->multicast_lock);
1639 setup_timer(&br->multicast_router_timer,
1640 br_multicast_local_router_expired, 0);
1641 setup_timer(&br->multicast_querier_timer,
1642 br_multicast_querier_expired, (unsigned long)br);
1643 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1644 (unsigned long)br);
1645 }
1646
1647 void br_multicast_open(struct net_bridge *br)
1648 {
1649 br->multicast_startup_queries_sent = 0;
1650
1651 if (br->multicast_disabled)
1652 return;
1653
1654 mod_timer(&br->multicast_query_timer, jiffies);
1655 }
1656
1657 void br_multicast_stop(struct net_bridge *br)
1658 {
1659 struct net_bridge_mdb_htable *mdb;
1660 struct net_bridge_mdb_entry *mp;
1661 struct hlist_node *n;
1662 u32 ver;
1663 int i;
1664
1665 del_timer_sync(&br->multicast_router_timer);
1666 del_timer_sync(&br->multicast_querier_timer);
1667 del_timer_sync(&br->multicast_query_timer);
1668
1669 spin_lock_bh(&br->multicast_lock);
1670 mdb = mlock_dereference(br->mdb, br);
1671 if (!mdb)
1672 goto out;
1673
1674 br->mdb = NULL;
1675
1676 ver = mdb->ver;
1677 for (i = 0; i < mdb->max; i++) {
1678 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1679 hlist[ver]) {
1680 del_timer(&mp->timer);
1681 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1682 }
1683 }
1684
1685 if (mdb->old) {
1686 spin_unlock_bh(&br->multicast_lock);
1687 rcu_barrier_bh();
1688 spin_lock_bh(&br->multicast_lock);
1689 WARN_ON(mdb->old);
1690 }
1691
1692 mdb->old = mdb;
1693 call_rcu_bh(&mdb->rcu, br_mdb_free);
1694
1695 out:
1696 spin_unlock_bh(&br->multicast_lock);
1697 }
1698
1699 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1700 {
1701 int err = -ENOENT;
1702
1703 spin_lock_bh(&br->multicast_lock);
1704 if (!netif_running(br->dev))
1705 goto unlock;
1706
1707 switch (val) {
1708 case 0:
1709 case 2:
1710 del_timer(&br->multicast_router_timer);
1711 /* fall through */
1712 case 1:
1713 br->multicast_router = val;
1714 err = 0;
1715 break;
1716
1717 default:
1718 err = -EINVAL;
1719 break;
1720 }
1721
1722 unlock:
1723 spin_unlock_bh(&br->multicast_lock);
1724
1725 return err;
1726 }
1727
1728 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1729 {
1730 struct net_bridge *br = p->br;
1731 int err = -ENOENT;
1732
1733 spin_lock(&br->multicast_lock);
1734 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1735 goto unlock;
1736
1737 switch (val) {
1738 case 0:
1739 case 1:
1740 case 2:
1741 p->multicast_router = val;
1742 err = 0;
1743
1744 if (val < 2 && !hlist_unhashed(&p->rlist))
1745 hlist_del_init_rcu(&p->rlist);
1746
1747 if (val == 1)
1748 break;
1749
1750 del_timer(&p->multicast_router_timer);
1751
1752 if (val == 0)
1753 break;
1754
1755 br_multicast_add_router(br, p);
1756 break;
1757
1758 default:
1759 err = -EINVAL;
1760 break;
1761 }
1762
1763 unlock:
1764 spin_unlock(&br->multicast_lock);
1765
1766 return err;
1767 }
1768
1769 static void br_multicast_start_querier(struct net_bridge *br)
1770 {
1771 struct net_bridge_port *port;
1772
1773 br_multicast_open(br);
1774
1775 list_for_each_entry(port, &br->port_list, list) {
1776 if (port->state == BR_STATE_DISABLED ||
1777 port->state == BR_STATE_BLOCKING)
1778 continue;
1779
1780 __br_multicast_enable_port(port);
1781 }
1782 }
1783
1784 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1785 {
1786 int err = 0;
1787 struct net_bridge_mdb_htable *mdb;
1788
1789 spin_lock_bh(&br->multicast_lock);
1790 if (br->multicast_disabled == !val)
1791 goto unlock;
1792
1793 br->multicast_disabled = !val;
1794 if (br->multicast_disabled)
1795 goto unlock;
1796
1797 if (!netif_running(br->dev))
1798 goto unlock;
1799
1800 mdb = mlock_dereference(br->mdb, br);
1801 if (mdb) {
1802 if (mdb->old) {
1803 err = -EEXIST;
1804 rollback:
1805 br->multicast_disabled = !!val;
1806 goto unlock;
1807 }
1808
1809 err = br_mdb_rehash(&br->mdb, mdb->max,
1810 br->hash_elasticity);
1811 if (err)
1812 goto rollback;
1813 }
1814
1815 br_multicast_start_querier(br);
1816
1817 unlock:
1818 spin_unlock_bh(&br->multicast_lock);
1819
1820 return err;
1821 }
1822
1823 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1824 {
1825 val = !!val;
1826
1827 spin_lock_bh(&br->multicast_lock);
1828 if (br->multicast_querier == val)
1829 goto unlock;
1830
1831 br->multicast_querier = val;
1832 if (val)
1833 br_multicast_start_querier(br);
1834
1835 unlock:
1836 spin_unlock_bh(&br->multicast_lock);
1837
1838 return 0;
1839 }
1840
1841 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1842 {
1843 int err = -ENOENT;
1844 u32 old;
1845 struct net_bridge_mdb_htable *mdb;
1846
1847 spin_lock_bh(&br->multicast_lock);
1848 if (!netif_running(br->dev))
1849 goto unlock;
1850
1851 err = -EINVAL;
1852 if (!is_power_of_2(val))
1853 goto unlock;
1854
1855 mdb = mlock_dereference(br->mdb, br);
1856 if (mdb && val < mdb->size)
1857 goto unlock;
1858
1859 err = 0;
1860
1861 old = br->hash_max;
1862 br->hash_max = val;
1863
1864 if (mdb) {
1865 if (mdb->old) {
1866 err = -EEXIST;
1867 rollback:
1868 br->hash_max = old;
1869 goto unlock;
1870 }
1871
1872 err = br_mdb_rehash(&br->mdb, br->hash_max,
1873 br->hash_elasticity);
1874 if (err)
1875 goto rollback;
1876 }
1877
1878 unlock:
1879 spin_unlock_bh(&br->multicast_lock);
1880
1881 return err;
1882 }
kernel source for telekom puls (alcatel/mediatek)