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Merge branch 'x86/microcode' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
[deliverable/linux.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 struct hlist_node *p;
90
91 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
92 if (br_ip_equal(&mp->addr, dst))
93 return mp;
94 }
95
96 return NULL;
97 }
98
99 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
100 struct br_ip *dst)
101 {
102 if (!mdb)
103 return NULL;
104
105 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
106 }
107
108 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
109 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
110 {
111 struct br_ip br_dst;
112
113 br_dst.u.ip4 = dst;
114 br_dst.proto = htons(ETH_P_IP);
115 br_dst.vid = vid;
116
117 return br_mdb_ip_get(mdb, &br_dst);
118 }
119
120 #if IS_ENABLED(CONFIG_IPV6)
121 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
122 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
123 __u16 vid)
124 {
125 struct br_ip br_dst;
126
127 br_dst.u.ip6 = *dst;
128 br_dst.proto = htons(ETH_P_IPV6);
129 br_dst.vid = vid;
130
131 return br_mdb_ip_get(mdb, &br_dst);
132 }
133 #endif
134
135 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
136 struct sk_buff *skb)
137 {
138 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
139 struct br_ip ip;
140
141 if (br->multicast_disabled)
142 return NULL;
143
144 if (BR_INPUT_SKB_CB(skb)->igmp)
145 return NULL;
146
147 ip.proto = skb->protocol;
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 struct hlist_node *p;
182 int maxlen;
183 int len;
184 int i;
185
186 for (i = 0; i < old->max; i++)
187 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
188 hlist_add_head(&mp->hlist[new->ver],
189 &new->mhash[br_ip_hash(new, &mp->addr)]);
190
191 if (!elasticity)
192 return 0;
193
194 maxlen = 0;
195 for (i = 0; i < new->max; i++) {
196 len = 0;
197 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
198 len++;
199 if (len > maxlen)
200 maxlen = len;
201 }
202
203 return maxlen > elasticity ? -EINVAL : 0;
204 }
205
206 void br_multicast_free_pg(struct rcu_head *head)
207 {
208 struct net_bridge_port_group *p =
209 container_of(head, struct net_bridge_port_group, rcu);
210
211 kfree(p);
212 }
213
214 static void br_multicast_free_group(struct rcu_head *head)
215 {
216 struct net_bridge_mdb_entry *mp =
217 container_of(head, struct net_bridge_mdb_entry, rcu);
218
219 kfree(mp);
220 }
221
222 static void br_multicast_group_expired(unsigned long data)
223 {
224 struct net_bridge_mdb_entry *mp = (void *)data;
225 struct net_bridge *br = mp->br;
226 struct net_bridge_mdb_htable *mdb;
227
228 spin_lock(&br->multicast_lock);
229 if (!netif_running(br->dev) || timer_pending(&mp->timer))
230 goto out;
231
232 mp->mglist = false;
233
234 if (mp->ports)
235 goto out;
236
237 mdb = mlock_dereference(br->mdb, br);
238
239 hlist_del_rcu(&mp->hlist[mdb->ver]);
240 mdb->size--;
241
242 call_rcu_bh(&mp->rcu, br_multicast_free_group);
243
244 out:
245 spin_unlock(&br->multicast_lock);
246 }
247
248 static void br_multicast_del_pg(struct net_bridge *br,
249 struct net_bridge_port_group *pg)
250 {
251 struct net_bridge_mdb_htable *mdb;
252 struct net_bridge_mdb_entry *mp;
253 struct net_bridge_port_group *p;
254 struct net_bridge_port_group __rcu **pp;
255
256 mdb = mlock_dereference(br->mdb, br);
257
258 mp = br_mdb_ip_get(mdb, &pg->addr);
259 if (WARN_ON(!mp))
260 return;
261
262 for (pp = &mp->ports;
263 (p = mlock_dereference(*pp, br)) != NULL;
264 pp = &p->next) {
265 if (p != pg)
266 continue;
267
268 rcu_assign_pointer(*pp, p->next);
269 hlist_del_init(&p->mglist);
270 del_timer(&p->timer);
271 call_rcu_bh(&p->rcu, br_multicast_free_pg);
272
273 if (!mp->ports && !mp->mglist &&
274 netif_running(br->dev))
275 mod_timer(&mp->timer, jiffies);
276
277 return;
278 }
279
280 WARN_ON(1);
281 }
282
283 static void br_multicast_port_group_expired(unsigned long data)
284 {
285 struct net_bridge_port_group *pg = (void *)data;
286 struct net_bridge *br = pg->port->br;
287
288 spin_lock(&br->multicast_lock);
289 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
290 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
291 goto out;
292
293 br_multicast_del_pg(br, pg);
294
295 out:
296 spin_unlock(&br->multicast_lock);
297 }
298
299 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
300 int elasticity)
301 {
302 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
303 struct net_bridge_mdb_htable *mdb;
304 int err;
305
306 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
307 if (!mdb)
308 return -ENOMEM;
309
310 mdb->max = max;
311 mdb->old = old;
312
313 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
314 if (!mdb->mhash) {
315 kfree(mdb);
316 return -ENOMEM;
317 }
318
319 mdb->size = old ? old->size : 0;
320 mdb->ver = old ? old->ver ^ 1 : 0;
321
322 if (!old || elasticity)
323 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
324 else
325 mdb->secret = old->secret;
326
327 if (!old)
328 goto out;
329
330 err = br_mdb_copy(mdb, old, elasticity);
331 if (err) {
332 kfree(mdb->mhash);
333 kfree(mdb);
334 return err;
335 }
336
337 br_mdb_rehash_seq++;
338 call_rcu_bh(&mdb->rcu, br_mdb_free);
339
340 out:
341 rcu_assign_pointer(*mdbp, mdb);
342
343 return 0;
344 }
345
346 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
347 __be32 group)
348 {
349 struct sk_buff *skb;
350 struct igmphdr *ih;
351 struct ethhdr *eth;
352 struct iphdr *iph;
353
354 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
355 sizeof(*ih) + 4);
356 if (!skb)
357 goto out;
358
359 skb->protocol = htons(ETH_P_IP);
360
361 skb_reset_mac_header(skb);
362 eth = eth_hdr(skb);
363
364 memcpy(eth->h_source, br->dev->dev_addr, 6);
365 eth->h_dest[0] = 1;
366 eth->h_dest[1] = 0;
367 eth->h_dest[2] = 0x5e;
368 eth->h_dest[3] = 0;
369 eth->h_dest[4] = 0;
370 eth->h_dest[5] = 1;
371 eth->h_proto = htons(ETH_P_IP);
372 skb_put(skb, sizeof(*eth));
373
374 skb_set_network_header(skb, skb->len);
375 iph = ip_hdr(skb);
376
377 iph->version = 4;
378 iph->ihl = 6;
379 iph->tos = 0xc0;
380 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
381 iph->id = 0;
382 iph->frag_off = htons(IP_DF);
383 iph->ttl = 1;
384 iph->protocol = IPPROTO_IGMP;
385 iph->saddr = 0;
386 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
387 ((u8 *)&iph[1])[0] = IPOPT_RA;
388 ((u8 *)&iph[1])[1] = 4;
389 ((u8 *)&iph[1])[2] = 0;
390 ((u8 *)&iph[1])[3] = 0;
391 ip_send_check(iph);
392 skb_put(skb, 24);
393
394 skb_set_transport_header(skb, skb->len);
395 ih = igmp_hdr(skb);
396 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
397 ih->code = (group ? br->multicast_last_member_interval :
398 br->multicast_query_response_interval) /
399 (HZ / IGMP_TIMER_SCALE);
400 ih->group = group;
401 ih->csum = 0;
402 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
403 skb_put(skb, sizeof(*ih));
404
405 __skb_pull(skb, sizeof(*eth));
406
407 out:
408 return skb;
409 }
410
411 #if IS_ENABLED(CONFIG_IPV6)
412 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
413 const struct in6_addr *group)
414 {
415 struct sk_buff *skb;
416 struct ipv6hdr *ip6h;
417 struct mld_msg *mldq;
418 struct ethhdr *eth;
419 u8 *hopopt;
420 unsigned long interval;
421
422 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
423 8 + sizeof(*mldq));
424 if (!skb)
425 goto out;
426
427 skb->protocol = htons(ETH_P_IPV6);
428
429 /* Ethernet header */
430 skb_reset_mac_header(skb);
431 eth = eth_hdr(skb);
432
433 memcpy(eth->h_source, br->dev->dev_addr, 6);
434 eth->h_proto = htons(ETH_P_IPV6);
435 skb_put(skb, sizeof(*eth));
436
437 /* IPv6 header + HbH option */
438 skb_set_network_header(skb, skb->len);
439 ip6h = ipv6_hdr(skb);
440
441 *(__force __be32 *)ip6h = htonl(0x60000000);
442 ip6h->payload_len = htons(8 + sizeof(*mldq));
443 ip6h->nexthdr = IPPROTO_HOPOPTS;
444 ip6h->hop_limit = 1;
445 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
446 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
447 &ip6h->saddr)) {
448 kfree_skb(skb);
449 return NULL;
450 }
451 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
452
453 hopopt = (u8 *)(ip6h + 1);
454 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
455 hopopt[1] = 0; /* length of HbH */
456 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
457 hopopt[3] = 2; /* Length of RA Option */
458 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
459 hopopt[5] = 0;
460 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
461 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
462
463 skb_put(skb, sizeof(*ip6h) + 8);
464
465 /* ICMPv6 */
466 skb_set_transport_header(skb, skb->len);
467 mldq = (struct mld_msg *) icmp6_hdr(skb);
468
469 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
470 br->multicast_query_response_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 struct hlist_node *p;
514 unsigned int count = 0;
515 unsigned int max;
516 int elasticity;
517 int err;
518
519 mdb = rcu_dereference_protected(br->mdb, 1);
520 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
521 count++;
522 if (unlikely(br_ip_equal(group, &mp->addr)))
523 return mp;
524 }
525
526 elasticity = 0;
527 max = mdb->max;
528
529 if (unlikely(count > br->hash_elasticity && count)) {
530 if (net_ratelimit())
531 br_info(br, "Multicast hash table "
532 "chain limit reached: %s\n",
533 port ? port->dev->name : br->dev->name);
534
535 elasticity = br->hash_elasticity;
536 }
537
538 if (mdb->size >= max) {
539 max *= 2;
540 if (unlikely(max > br->hash_max)) {
541 br_warn(br, "Multicast hash table maximum of %d "
542 "reached, disabling snooping: %s\n",
543 br->hash_max,
544 port ? port->dev->name : br->dev->name);
545 err = -E2BIG;
546 disable:
547 br->multicast_disabled = 1;
548 goto err;
549 }
550 }
551
552 if (max > mdb->max || elasticity) {
553 if (mdb->old) {
554 if (net_ratelimit())
555 br_info(br, "Multicast hash table "
556 "on fire: %s\n",
557 port ? port->dev->name : br->dev->name);
558 err = -EEXIST;
559 goto err;
560 }
561
562 err = br_mdb_rehash(&br->mdb, max, elasticity);
563 if (err) {
564 br_warn(br, "Cannot rehash multicast "
565 "hash table, disabling snooping: %s, %d, %d\n",
566 port ? port->dev->name : br->dev->name,
567 mdb->size, err);
568 goto disable;
569 }
570
571 err = -EAGAIN;
572 goto err;
573 }
574
575 return NULL;
576
577 err:
578 mp = ERR_PTR(err);
579 return mp;
580 }
581
582 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
583 struct net_bridge_port *port, struct br_ip *group)
584 {
585 struct net_bridge_mdb_htable *mdb;
586 struct net_bridge_mdb_entry *mp;
587 int hash;
588 int err;
589
590 mdb = rcu_dereference_protected(br->mdb, 1);
591 if (!mdb) {
592 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
593 if (err)
594 return ERR_PTR(err);
595 goto rehash;
596 }
597
598 hash = br_ip_hash(mdb, group);
599 mp = br_multicast_get_group(br, port, group, hash);
600 switch (PTR_ERR(mp)) {
601 case 0:
602 break;
603
604 case -EAGAIN:
605 rehash:
606 mdb = rcu_dereference_protected(br->mdb, 1);
607 hash = br_ip_hash(mdb, group);
608 break;
609
610 default:
611 goto out;
612 }
613
614 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
615 if (unlikely(!mp))
616 return ERR_PTR(-ENOMEM);
617
618 mp->br = br;
619 mp->addr = *group;
620 setup_timer(&mp->timer, br_multicast_group_expired,
621 (unsigned long)mp);
622
623 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
624 mdb->size++;
625
626 out:
627 return mp;
628 }
629
630 struct net_bridge_port_group *br_multicast_new_port_group(
631 struct net_bridge_port *port,
632 struct br_ip *group,
633 struct net_bridge_port_group __rcu *next,
634 unsigned char state)
635 {
636 struct net_bridge_port_group *p;
637
638 p = kzalloc(sizeof(*p), GFP_ATOMIC);
639 if (unlikely(!p))
640 return NULL;
641
642 p->addr = *group;
643 p->port = port;
644 p->state = state;
645 rcu_assign_pointer(p->next, next);
646 hlist_add_head(&p->mglist, &port->mglist);
647 setup_timer(&p->timer, br_multicast_port_group_expired,
648 (unsigned long)p);
649 return p;
650 }
651
652 static int br_multicast_add_group(struct net_bridge *br,
653 struct net_bridge_port *port,
654 struct br_ip *group)
655 {
656 struct net_bridge_mdb_entry *mp;
657 struct net_bridge_port_group *p;
658 struct net_bridge_port_group __rcu **pp;
659 unsigned long now = jiffies;
660 int err;
661
662 spin_lock(&br->multicast_lock);
663 if (!netif_running(br->dev) ||
664 (port && port->state == BR_STATE_DISABLED))
665 goto out;
666
667 mp = br_multicast_new_group(br, port, group);
668 err = PTR_ERR(mp);
669 if (IS_ERR(mp))
670 goto err;
671
672 if (!port) {
673 mp->mglist = true;
674 mod_timer(&mp->timer, now + br->multicast_membership_interval);
675 goto out;
676 }
677
678 for (pp = &mp->ports;
679 (p = mlock_dereference(*pp, br)) != NULL;
680 pp = &p->next) {
681 if (p->port == port)
682 goto found;
683 if ((unsigned long)p->port < (unsigned long)port)
684 break;
685 }
686
687 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
688 if (unlikely(!p))
689 goto err;
690 rcu_assign_pointer(*pp, p);
691 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
692
693 found:
694 mod_timer(&p->timer, now + br->multicast_membership_interval);
695 out:
696 err = 0;
697
698 err:
699 spin_unlock(&br->multicast_lock);
700 return err;
701 }
702
703 static int br_ip4_multicast_add_group(struct net_bridge *br,
704 struct net_bridge_port *port,
705 __be32 group,
706 __u16 vid)
707 {
708 struct br_ip br_group;
709
710 if (ipv4_is_local_multicast(group))
711 return 0;
712
713 br_group.u.ip4 = group;
714 br_group.proto = htons(ETH_P_IP);
715 br_group.vid = vid;
716
717 return br_multicast_add_group(br, port, &br_group);
718 }
719
720 #if IS_ENABLED(CONFIG_IPV6)
721 static int br_ip6_multicast_add_group(struct net_bridge *br,
722 struct net_bridge_port *port,
723 const struct in6_addr *group,
724 __u16 vid)
725 {
726 struct br_ip br_group;
727
728 if (!ipv6_is_transient_multicast(group))
729 return 0;
730
731 br_group.u.ip6 = *group;
732 br_group.proto = htons(ETH_P_IPV6);
733 br_group.vid = vid;
734
735 return br_multicast_add_group(br, port, &br_group);
736 }
737 #endif
738
739 static void br_multicast_router_expired(unsigned long data)
740 {
741 struct net_bridge_port *port = (void *)data;
742 struct net_bridge *br = port->br;
743
744 spin_lock(&br->multicast_lock);
745 if (port->multicast_router != 1 ||
746 timer_pending(&port->multicast_router_timer) ||
747 hlist_unhashed(&port->rlist))
748 goto out;
749
750 hlist_del_init_rcu(&port->rlist);
751
752 out:
753 spin_unlock(&br->multicast_lock);
754 }
755
756 static void br_multicast_local_router_expired(unsigned long data)
757 {
758 }
759
760 static void br_multicast_querier_expired(unsigned long data)
761 {
762 struct net_bridge *br = (void *)data;
763
764 spin_lock(&br->multicast_lock);
765 if (!netif_running(br->dev) || br->multicast_disabled)
766 goto out;
767
768 br_multicast_start_querier(br);
769
770 out:
771 spin_unlock(&br->multicast_lock);
772 }
773
774 static void __br_multicast_send_query(struct net_bridge *br,
775 struct net_bridge_port *port,
776 struct br_ip *ip)
777 {
778 struct sk_buff *skb;
779
780 skb = br_multicast_alloc_query(br, ip);
781 if (!skb)
782 return;
783
784 if (port) {
785 __skb_push(skb, sizeof(struct ethhdr));
786 skb->dev = port->dev;
787 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
788 dev_queue_xmit);
789 } else
790 netif_rx(skb);
791 }
792
793 static void br_multicast_send_query(struct net_bridge *br,
794 struct net_bridge_port *port, u32 sent)
795 {
796 unsigned long time;
797 struct br_ip br_group;
798
799 if (!netif_running(br->dev) || br->multicast_disabled ||
800 !br->multicast_querier ||
801 timer_pending(&br->multicast_querier_timer))
802 return;
803
804 memset(&br_group.u, 0, sizeof(br_group.u));
805
806 br_group.proto = htons(ETH_P_IP);
807 __br_multicast_send_query(br, port, &br_group);
808
809 #if IS_ENABLED(CONFIG_IPV6)
810 br_group.proto = htons(ETH_P_IPV6);
811 __br_multicast_send_query(br, port, &br_group);
812 #endif
813
814 time = jiffies;
815 time += sent < br->multicast_startup_query_count ?
816 br->multicast_startup_query_interval :
817 br->multicast_query_interval;
818 mod_timer(port ? &port->multicast_query_timer :
819 &br->multicast_query_timer, time);
820 }
821
822 static void br_multicast_port_query_expired(unsigned long data)
823 {
824 struct net_bridge_port *port = (void *)data;
825 struct net_bridge *br = port->br;
826
827 spin_lock(&br->multicast_lock);
828 if (port->state == BR_STATE_DISABLED ||
829 port->state == BR_STATE_BLOCKING)
830 goto out;
831
832 if (port->multicast_startup_queries_sent <
833 br->multicast_startup_query_count)
834 port->multicast_startup_queries_sent++;
835
836 br_multicast_send_query(port->br, port,
837 port->multicast_startup_queries_sent);
838
839 out:
840 spin_unlock(&br->multicast_lock);
841 }
842
843 void br_multicast_add_port(struct net_bridge_port *port)
844 {
845 port->multicast_router = 1;
846
847 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
848 (unsigned long)port);
849 setup_timer(&port->multicast_query_timer,
850 br_multicast_port_query_expired, (unsigned long)port);
851 }
852
853 void br_multicast_del_port(struct net_bridge_port *port)
854 {
855 del_timer_sync(&port->multicast_router_timer);
856 }
857
858 static void __br_multicast_enable_port(struct net_bridge_port *port)
859 {
860 port->multicast_startup_queries_sent = 0;
861
862 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
863 del_timer(&port->multicast_query_timer))
864 mod_timer(&port->multicast_query_timer, jiffies);
865 }
866
867 void br_multicast_enable_port(struct net_bridge_port *port)
868 {
869 struct net_bridge *br = port->br;
870
871 spin_lock(&br->multicast_lock);
872 if (br->multicast_disabled || !netif_running(br->dev))
873 goto out;
874
875 __br_multicast_enable_port(port);
876
877 out:
878 spin_unlock(&br->multicast_lock);
879 }
880
881 void br_multicast_disable_port(struct net_bridge_port *port)
882 {
883 struct net_bridge *br = port->br;
884 struct net_bridge_port_group *pg;
885 struct hlist_node *p, *n;
886
887 spin_lock(&br->multicast_lock);
888 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
889 br_multicast_del_pg(br, pg);
890
891 if (!hlist_unhashed(&port->rlist))
892 hlist_del_init_rcu(&port->rlist);
893 del_timer(&port->multicast_router_timer);
894 del_timer(&port->multicast_query_timer);
895 spin_unlock(&br->multicast_lock);
896 }
897
898 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
899 struct net_bridge_port *port,
900 struct sk_buff *skb)
901 {
902 struct igmpv3_report *ih;
903 struct igmpv3_grec *grec;
904 int i;
905 int len;
906 int num;
907 int type;
908 int err = 0;
909 __be32 group;
910 u16 vid = 0;
911
912 if (!pskb_may_pull(skb, sizeof(*ih)))
913 return -EINVAL;
914
915 br_vlan_get_tag(skb, &vid);
916 ih = igmpv3_report_hdr(skb);
917 num = ntohs(ih->ngrec);
918 len = sizeof(*ih);
919
920 for (i = 0; i < num; i++) {
921 len += sizeof(*grec);
922 if (!pskb_may_pull(skb, len))
923 return -EINVAL;
924
925 grec = (void *)(skb->data + len - sizeof(*grec));
926 group = grec->grec_mca;
927 type = grec->grec_type;
928
929 len += ntohs(grec->grec_nsrcs) * 4;
930 if (!pskb_may_pull(skb, len))
931 return -EINVAL;
932
933 /* We treat this as an IGMPv2 report for now. */
934 switch (type) {
935 case IGMPV3_MODE_IS_INCLUDE:
936 case IGMPV3_MODE_IS_EXCLUDE:
937 case IGMPV3_CHANGE_TO_INCLUDE:
938 case IGMPV3_CHANGE_TO_EXCLUDE:
939 case IGMPV3_ALLOW_NEW_SOURCES:
940 case IGMPV3_BLOCK_OLD_SOURCES:
941 break;
942
943 default:
944 continue;
945 }
946
947 err = br_ip4_multicast_add_group(br, port, group, vid);
948 if (err)
949 break;
950 }
951
952 return err;
953 }
954
955 #if IS_ENABLED(CONFIG_IPV6)
956 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
957 struct net_bridge_port *port,
958 struct sk_buff *skb)
959 {
960 struct icmp6hdr *icmp6h;
961 struct mld2_grec *grec;
962 int i;
963 int len;
964 int num;
965 int err = 0;
966 u16 vid = 0;
967
968 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
969 return -EINVAL;
970
971 br_vlan_get_tag(skb, &vid);
972 icmp6h = icmp6_hdr(skb);
973 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
974 len = sizeof(*icmp6h);
975
976 for (i = 0; i < num; i++) {
977 __be16 *nsrcs, _nsrcs;
978
979 nsrcs = skb_header_pointer(skb,
980 len + offsetof(struct mld2_grec,
981 grec_nsrcs),
982 sizeof(_nsrcs), &_nsrcs);
983 if (!nsrcs)
984 return -EINVAL;
985
986 if (!pskb_may_pull(skb,
987 len + sizeof(*grec) +
988 sizeof(struct in6_addr) * ntohs(*nsrcs)))
989 return -EINVAL;
990
991 grec = (struct mld2_grec *)(skb->data + len);
992 len += sizeof(*grec) +
993 sizeof(struct in6_addr) * ntohs(*nsrcs);
994
995 /* We treat these as MLDv1 reports for now. */
996 switch (grec->grec_type) {
997 case MLD2_MODE_IS_INCLUDE:
998 case MLD2_MODE_IS_EXCLUDE:
999 case MLD2_CHANGE_TO_INCLUDE:
1000 case MLD2_CHANGE_TO_EXCLUDE:
1001 case MLD2_ALLOW_NEW_SOURCES:
1002 case MLD2_BLOCK_OLD_SOURCES:
1003 break;
1004
1005 default:
1006 continue;
1007 }
1008
1009 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1010 vid);
1011 if (!err)
1012 break;
1013 }
1014
1015 return err;
1016 }
1017 #endif
1018
1019 /*
1020 * Add port to rotuer_list
1021 * list is maintained ordered by pointer value
1022 * and locked by br->multicast_lock and RCU
1023 */
1024 static void br_multicast_add_router(struct net_bridge *br,
1025 struct net_bridge_port *port)
1026 {
1027 struct net_bridge_port *p;
1028 struct hlist_node *n, *slot = NULL;
1029
1030 hlist_for_each_entry(p, n, &br->router_list, rlist) {
1031 if ((unsigned long) port >= (unsigned long) p)
1032 break;
1033 slot = n;
1034 }
1035
1036 if (slot)
1037 hlist_add_after_rcu(slot, &port->rlist);
1038 else
1039 hlist_add_head_rcu(&port->rlist, &br->router_list);
1040 }
1041
1042 static void br_multicast_mark_router(struct net_bridge *br,
1043 struct net_bridge_port *port)
1044 {
1045 unsigned long now = jiffies;
1046
1047 if (!port) {
1048 if (br->multicast_router == 1)
1049 mod_timer(&br->multicast_router_timer,
1050 now + br->multicast_querier_interval);
1051 return;
1052 }
1053
1054 if (port->multicast_router != 1)
1055 return;
1056
1057 if (!hlist_unhashed(&port->rlist))
1058 goto timer;
1059
1060 br_multicast_add_router(br, port);
1061
1062 timer:
1063 mod_timer(&port->multicast_router_timer,
1064 now + br->multicast_querier_interval);
1065 }
1066
1067 static void br_multicast_query_received(struct net_bridge *br,
1068 struct net_bridge_port *port,
1069 int saddr)
1070 {
1071 if (saddr)
1072 mod_timer(&br->multicast_querier_timer,
1073 jiffies + br->multicast_querier_interval);
1074 else if (timer_pending(&br->multicast_querier_timer))
1075 return;
1076
1077 br_multicast_mark_router(br, port);
1078 }
1079
1080 static int br_ip4_multicast_query(struct net_bridge *br,
1081 struct net_bridge_port *port,
1082 struct sk_buff *skb)
1083 {
1084 const struct iphdr *iph = ip_hdr(skb);
1085 struct igmphdr *ih = igmp_hdr(skb);
1086 struct net_bridge_mdb_entry *mp;
1087 struct igmpv3_query *ih3;
1088 struct net_bridge_port_group *p;
1089 struct net_bridge_port_group __rcu **pp;
1090 unsigned long max_delay;
1091 unsigned long now = jiffies;
1092 __be32 group;
1093 int err = 0;
1094 u16 vid = 0;
1095
1096 spin_lock(&br->multicast_lock);
1097 if (!netif_running(br->dev) ||
1098 (port && port->state == BR_STATE_DISABLED))
1099 goto out;
1100
1101 br_multicast_query_received(br, port, !!iph->saddr);
1102
1103 group = ih->group;
1104
1105 if (skb->len == sizeof(*ih)) {
1106 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1107
1108 if (!max_delay) {
1109 max_delay = 10 * HZ;
1110 group = 0;
1111 }
1112 } else {
1113 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1114 err = -EINVAL;
1115 goto out;
1116 }
1117
1118 ih3 = igmpv3_query_hdr(skb);
1119 if (ih3->nsrcs)
1120 goto out;
1121
1122 max_delay = ih3->code ?
1123 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1124 }
1125
1126 if (!group)
1127 goto out;
1128
1129 br_vlan_get_tag(skb, &vid);
1130 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1131 if (!mp)
1132 goto out;
1133
1134 max_delay *= br->multicast_last_member_count;
1135
1136 if (mp->mglist &&
1137 (timer_pending(&mp->timer) ?
1138 time_after(mp->timer.expires, now + max_delay) :
1139 try_to_del_timer_sync(&mp->timer) >= 0))
1140 mod_timer(&mp->timer, now + max_delay);
1141
1142 for (pp = &mp->ports;
1143 (p = mlock_dereference(*pp, br)) != NULL;
1144 pp = &p->next) {
1145 if (timer_pending(&p->timer) ?
1146 time_after(p->timer.expires, now + max_delay) :
1147 try_to_del_timer_sync(&p->timer) >= 0)
1148 mod_timer(&p->timer, now + max_delay);
1149 }
1150
1151 out:
1152 spin_unlock(&br->multicast_lock);
1153 return err;
1154 }
1155
1156 #if IS_ENABLED(CONFIG_IPV6)
1157 static int br_ip6_multicast_query(struct net_bridge *br,
1158 struct net_bridge_port *port,
1159 struct sk_buff *skb)
1160 {
1161 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1162 struct mld_msg *mld;
1163 struct net_bridge_mdb_entry *mp;
1164 struct mld2_query *mld2q;
1165 struct net_bridge_port_group *p;
1166 struct net_bridge_port_group __rcu **pp;
1167 unsigned long max_delay;
1168 unsigned long now = jiffies;
1169 const struct in6_addr *group = NULL;
1170 int err = 0;
1171 u16 vid = 0;
1172
1173 spin_lock(&br->multicast_lock);
1174 if (!netif_running(br->dev) ||
1175 (port && port->state == BR_STATE_DISABLED))
1176 goto out;
1177
1178 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1179
1180 if (skb->len == sizeof(*mld)) {
1181 if (!pskb_may_pull(skb, sizeof(*mld))) {
1182 err = -EINVAL;
1183 goto out;
1184 }
1185 mld = (struct mld_msg *) icmp6_hdr(skb);
1186 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1187 if (max_delay)
1188 group = &mld->mld_mca;
1189 } else if (skb->len >= sizeof(*mld2q)) {
1190 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1191 err = -EINVAL;
1192 goto out;
1193 }
1194 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1195 if (!mld2q->mld2q_nsrcs)
1196 group = &mld2q->mld2q_mca;
1197 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(ntohs(mld2q->mld2q_mrc)) : 1;
1198 }
1199
1200 if (!group)
1201 goto out;
1202
1203 br_vlan_get_tag(skb, &vid);
1204 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1205 if (!mp)
1206 goto out;
1207
1208 max_delay *= br->multicast_last_member_count;
1209 if (mp->mglist &&
1210 (timer_pending(&mp->timer) ?
1211 time_after(mp->timer.expires, now + max_delay) :
1212 try_to_del_timer_sync(&mp->timer) >= 0))
1213 mod_timer(&mp->timer, now + max_delay);
1214
1215 for (pp = &mp->ports;
1216 (p = mlock_dereference(*pp, br)) != NULL;
1217 pp = &p->next) {
1218 if (timer_pending(&p->timer) ?
1219 time_after(p->timer.expires, now + max_delay) :
1220 try_to_del_timer_sync(&p->timer) >= 0)
1221 mod_timer(&p->timer, now + max_delay);
1222 }
1223
1224 out:
1225 spin_unlock(&br->multicast_lock);
1226 return err;
1227 }
1228 #endif
1229
1230 static void br_multicast_leave_group(struct net_bridge *br,
1231 struct net_bridge_port *port,
1232 struct br_ip *group)
1233 {
1234 struct net_bridge_mdb_htable *mdb;
1235 struct net_bridge_mdb_entry *mp;
1236 struct net_bridge_port_group *p;
1237 unsigned long now;
1238 unsigned long time;
1239
1240 spin_lock(&br->multicast_lock);
1241 if (!netif_running(br->dev) ||
1242 (port && port->state == BR_STATE_DISABLED) ||
1243 timer_pending(&br->multicast_querier_timer))
1244 goto out;
1245
1246 mdb = mlock_dereference(br->mdb, br);
1247 mp = br_mdb_ip_get(mdb, group);
1248 if (!mp)
1249 goto out;
1250
1251 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1252 struct net_bridge_port_group __rcu **pp;
1253
1254 for (pp = &mp->ports;
1255 (p = mlock_dereference(*pp, br)) != NULL;
1256 pp = &p->next) {
1257 if (p->port != port)
1258 continue;
1259
1260 rcu_assign_pointer(*pp, p->next);
1261 hlist_del_init(&p->mglist);
1262 del_timer(&p->timer);
1263 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1264 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1265
1266 if (!mp->ports && !mp->mglist &&
1267 netif_running(br->dev))
1268 mod_timer(&mp->timer, jiffies);
1269 }
1270 goto out;
1271 }
1272
1273 now = jiffies;
1274 time = now + br->multicast_last_member_count *
1275 br->multicast_last_member_interval;
1276
1277 if (!port) {
1278 if (mp->mglist &&
1279 (timer_pending(&mp->timer) ?
1280 time_after(mp->timer.expires, time) :
1281 try_to_del_timer_sync(&mp->timer) >= 0)) {
1282 mod_timer(&mp->timer, time);
1283 }
1284
1285 goto out;
1286 }
1287
1288 for (p = mlock_dereference(mp->ports, br);
1289 p != NULL;
1290 p = mlock_dereference(p->next, br)) {
1291 if (p->port != port)
1292 continue;
1293
1294 if (!hlist_unhashed(&p->mglist) &&
1295 (timer_pending(&p->timer) ?
1296 time_after(p->timer.expires, time) :
1297 try_to_del_timer_sync(&p->timer) >= 0)) {
1298 mod_timer(&p->timer, time);
1299 }
1300
1301 break;
1302 }
1303
1304 out:
1305 spin_unlock(&br->multicast_lock);
1306 }
1307
1308 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1309 struct net_bridge_port *port,
1310 __be32 group,
1311 __u16 vid)
1312 {
1313 struct br_ip br_group;
1314
1315 if (ipv4_is_local_multicast(group))
1316 return;
1317
1318 br_group.u.ip4 = group;
1319 br_group.proto = htons(ETH_P_IP);
1320 br_group.vid = vid;
1321
1322 br_multicast_leave_group(br, port, &br_group);
1323 }
1324
1325 #if IS_ENABLED(CONFIG_IPV6)
1326 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1327 struct net_bridge_port *port,
1328 const struct in6_addr *group,
1329 __u16 vid)
1330 {
1331 struct br_ip br_group;
1332
1333 if (!ipv6_is_transient_multicast(group))
1334 return;
1335
1336 br_group.u.ip6 = *group;
1337 br_group.proto = htons(ETH_P_IPV6);
1338 br_group.vid = vid;
1339
1340 br_multicast_leave_group(br, port, &br_group);
1341 }
1342 #endif
1343
1344 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1345 struct net_bridge_port *port,
1346 struct sk_buff *skb)
1347 {
1348 struct sk_buff *skb2 = skb;
1349 const struct iphdr *iph;
1350 struct igmphdr *ih;
1351 unsigned int len;
1352 unsigned int offset;
1353 int err;
1354 u16 vid = 0;
1355
1356 /* We treat OOM as packet loss for now. */
1357 if (!pskb_may_pull(skb, sizeof(*iph)))
1358 return -EINVAL;
1359
1360 iph = ip_hdr(skb);
1361
1362 if (iph->ihl < 5 || iph->version != 4)
1363 return -EINVAL;
1364
1365 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1366 return -EINVAL;
1367
1368 iph = ip_hdr(skb);
1369
1370 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1371 return -EINVAL;
1372
1373 if (iph->protocol != IPPROTO_IGMP) {
1374 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
1375 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1376 return 0;
1377 }
1378
1379 len = ntohs(iph->tot_len);
1380 if (skb->len < len || len < ip_hdrlen(skb))
1381 return -EINVAL;
1382
1383 if (skb->len > len) {
1384 skb2 = skb_clone(skb, GFP_ATOMIC);
1385 if (!skb2)
1386 return -ENOMEM;
1387
1388 err = pskb_trim_rcsum(skb2, len);
1389 if (err)
1390 goto err_out;
1391 }
1392
1393 len -= ip_hdrlen(skb2);
1394 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1395 __skb_pull(skb2, offset);
1396 skb_reset_transport_header(skb2);
1397
1398 err = -EINVAL;
1399 if (!pskb_may_pull(skb2, sizeof(*ih)))
1400 goto out;
1401
1402 switch (skb2->ip_summed) {
1403 case CHECKSUM_COMPLETE:
1404 if (!csum_fold(skb2->csum))
1405 break;
1406 /* fall through */
1407 case CHECKSUM_NONE:
1408 skb2->csum = 0;
1409 if (skb_checksum_complete(skb2))
1410 goto out;
1411 }
1412
1413 err = 0;
1414
1415 br_vlan_get_tag(skb2, &vid);
1416 BR_INPUT_SKB_CB(skb)->igmp = 1;
1417 ih = igmp_hdr(skb2);
1418
1419 switch (ih->type) {
1420 case IGMP_HOST_MEMBERSHIP_REPORT:
1421 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1422 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1423 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1424 break;
1425 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1426 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1427 break;
1428 case IGMP_HOST_MEMBERSHIP_QUERY:
1429 err = br_ip4_multicast_query(br, port, skb2);
1430 break;
1431 case IGMP_HOST_LEAVE_MESSAGE:
1432 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1433 break;
1434 }
1435
1436 out:
1437 __skb_push(skb2, offset);
1438 err_out:
1439 if (skb2 != skb)
1440 kfree_skb(skb2);
1441 return err;
1442 }
1443
1444 #if IS_ENABLED(CONFIG_IPV6)
1445 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1446 struct net_bridge_port *port,
1447 struct sk_buff *skb)
1448 {
1449 struct sk_buff *skb2;
1450 const struct ipv6hdr *ip6h;
1451 u8 icmp6_type;
1452 u8 nexthdr;
1453 __be16 frag_off;
1454 unsigned int len;
1455 int offset;
1456 int err;
1457 u16 vid = 0;
1458
1459 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1460 return -EINVAL;
1461
1462 ip6h = ipv6_hdr(skb);
1463
1464 /*
1465 * We're interested in MLD messages only.
1466 * - Version is 6
1467 * - MLD has always Router Alert hop-by-hop option
1468 * - But we do not support jumbrograms.
1469 */
1470 if (ip6h->version != 6 ||
1471 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1472 ip6h->payload_len == 0)
1473 return 0;
1474
1475 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1476 if (skb->len < len)
1477 return -EINVAL;
1478
1479 nexthdr = ip6h->nexthdr;
1480 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1481
1482 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1483 return 0;
1484
1485 /* Okay, we found ICMPv6 header */
1486 skb2 = skb_clone(skb, GFP_ATOMIC);
1487 if (!skb2)
1488 return -ENOMEM;
1489
1490 err = -EINVAL;
1491 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1492 goto out;
1493
1494 len -= offset - skb_network_offset(skb2);
1495
1496 __skb_pull(skb2, offset);
1497 skb_reset_transport_header(skb2);
1498 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1499 skb_network_header_len(skb2));
1500
1501 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1502
1503 switch (icmp6_type) {
1504 case ICMPV6_MGM_QUERY:
1505 case ICMPV6_MGM_REPORT:
1506 case ICMPV6_MGM_REDUCTION:
1507 case ICMPV6_MLD2_REPORT:
1508 break;
1509 default:
1510 err = 0;
1511 goto out;
1512 }
1513
1514 /* Okay, we found MLD message. Check further. */
1515 if (skb2->len > len) {
1516 err = pskb_trim_rcsum(skb2, len);
1517 if (err)
1518 goto out;
1519 err = -EINVAL;
1520 }
1521
1522 ip6h = ipv6_hdr(skb2);
1523
1524 switch (skb2->ip_summed) {
1525 case CHECKSUM_COMPLETE:
1526 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1527 IPPROTO_ICMPV6, skb2->csum))
1528 break;
1529 /*FALLTHROUGH*/
1530 case CHECKSUM_NONE:
1531 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1532 &ip6h->daddr,
1533 skb2->len,
1534 IPPROTO_ICMPV6, 0));
1535 if (__skb_checksum_complete(skb2))
1536 goto out;
1537 }
1538
1539 err = 0;
1540
1541 br_vlan_get_tag(skb, &vid);
1542 BR_INPUT_SKB_CB(skb)->igmp = 1;
1543
1544 switch (icmp6_type) {
1545 case ICMPV6_MGM_REPORT:
1546 {
1547 struct mld_msg *mld;
1548 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1549 err = -EINVAL;
1550 goto out;
1551 }
1552 mld = (struct mld_msg *)skb_transport_header(skb2);
1553 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1554 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1555 break;
1556 }
1557 case ICMPV6_MLD2_REPORT:
1558 err = br_ip6_multicast_mld2_report(br, port, skb2);
1559 break;
1560 case ICMPV6_MGM_QUERY:
1561 err = br_ip6_multicast_query(br, port, skb2);
1562 break;
1563 case ICMPV6_MGM_REDUCTION:
1564 {
1565 struct mld_msg *mld;
1566 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1567 err = -EINVAL;
1568 goto out;
1569 }
1570 mld = (struct mld_msg *)skb_transport_header(skb2);
1571 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1572 }
1573 }
1574
1575 out:
1576 kfree_skb(skb2);
1577 return err;
1578 }
1579 #endif
1580
1581 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1582 struct sk_buff *skb)
1583 {
1584 BR_INPUT_SKB_CB(skb)->igmp = 0;
1585 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1586
1587 if (br->multicast_disabled)
1588 return 0;
1589
1590 switch (skb->protocol) {
1591 case htons(ETH_P_IP):
1592 return br_multicast_ipv4_rcv(br, port, skb);
1593 #if IS_ENABLED(CONFIG_IPV6)
1594 case htons(ETH_P_IPV6):
1595 return br_multicast_ipv6_rcv(br, port, skb);
1596 #endif
1597 }
1598
1599 return 0;
1600 }
1601
1602 static void br_multicast_query_expired(unsigned long data)
1603 {
1604 struct net_bridge *br = (void *)data;
1605
1606 spin_lock(&br->multicast_lock);
1607 if (br->multicast_startup_queries_sent <
1608 br->multicast_startup_query_count)
1609 br->multicast_startup_queries_sent++;
1610
1611 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1612
1613 spin_unlock(&br->multicast_lock);
1614 }
1615
1616 void br_multicast_init(struct net_bridge *br)
1617 {
1618 br->hash_elasticity = 4;
1619 br->hash_max = 512;
1620
1621 br->multicast_router = 1;
1622 br->multicast_querier = 0;
1623 br->multicast_last_member_count = 2;
1624 br->multicast_startup_query_count = 2;
1625
1626 br->multicast_last_member_interval = HZ;
1627 br->multicast_query_response_interval = 10 * HZ;
1628 br->multicast_startup_query_interval = 125 * HZ / 4;
1629 br->multicast_query_interval = 125 * HZ;
1630 br->multicast_querier_interval = 255 * HZ;
1631 br->multicast_membership_interval = 260 * HZ;
1632
1633 spin_lock_init(&br->multicast_lock);
1634 setup_timer(&br->multicast_router_timer,
1635 br_multicast_local_router_expired, 0);
1636 setup_timer(&br->multicast_querier_timer,
1637 br_multicast_querier_expired, (unsigned long)br);
1638 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1639 (unsigned long)br);
1640 }
1641
1642 void br_multicast_open(struct net_bridge *br)
1643 {
1644 br->multicast_startup_queries_sent = 0;
1645
1646 if (br->multicast_disabled)
1647 return;
1648
1649 mod_timer(&br->multicast_query_timer, jiffies);
1650 }
1651
1652 void br_multicast_stop(struct net_bridge *br)
1653 {
1654 struct net_bridge_mdb_htable *mdb;
1655 struct net_bridge_mdb_entry *mp;
1656 struct hlist_node *p, *n;
1657 u32 ver;
1658 int i;
1659
1660 del_timer_sync(&br->multicast_router_timer);
1661 del_timer_sync(&br->multicast_querier_timer);
1662 del_timer_sync(&br->multicast_query_timer);
1663
1664 spin_lock_bh(&br->multicast_lock);
1665 mdb = mlock_dereference(br->mdb, br);
1666 if (!mdb)
1667 goto out;
1668
1669 br->mdb = NULL;
1670
1671 ver = mdb->ver;
1672 for (i = 0; i < mdb->max; i++) {
1673 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1674 hlist[ver]) {
1675 del_timer(&mp->timer);
1676 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1677 }
1678 }
1679
1680 if (mdb->old) {
1681 spin_unlock_bh(&br->multicast_lock);
1682 rcu_barrier_bh();
1683 spin_lock_bh(&br->multicast_lock);
1684 WARN_ON(mdb->old);
1685 }
1686
1687 mdb->old = mdb;
1688 call_rcu_bh(&mdb->rcu, br_mdb_free);
1689
1690 out:
1691 spin_unlock_bh(&br->multicast_lock);
1692 }
1693
1694 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1695 {
1696 int err = -ENOENT;
1697
1698 spin_lock_bh(&br->multicast_lock);
1699 if (!netif_running(br->dev))
1700 goto unlock;
1701
1702 switch (val) {
1703 case 0:
1704 case 2:
1705 del_timer(&br->multicast_router_timer);
1706 /* fall through */
1707 case 1:
1708 br->multicast_router = val;
1709 err = 0;
1710 break;
1711
1712 default:
1713 err = -EINVAL;
1714 break;
1715 }
1716
1717 unlock:
1718 spin_unlock_bh(&br->multicast_lock);
1719
1720 return err;
1721 }
1722
1723 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1724 {
1725 struct net_bridge *br = p->br;
1726 int err = -ENOENT;
1727
1728 spin_lock(&br->multicast_lock);
1729 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1730 goto unlock;
1731
1732 switch (val) {
1733 case 0:
1734 case 1:
1735 case 2:
1736 p->multicast_router = val;
1737 err = 0;
1738
1739 if (val < 2 && !hlist_unhashed(&p->rlist))
1740 hlist_del_init_rcu(&p->rlist);
1741
1742 if (val == 1)
1743 break;
1744
1745 del_timer(&p->multicast_router_timer);
1746
1747 if (val == 0)
1748 break;
1749
1750 br_multicast_add_router(br, p);
1751 break;
1752
1753 default:
1754 err = -EINVAL;
1755 break;
1756 }
1757
1758 unlock:
1759 spin_unlock(&br->multicast_lock);
1760
1761 return err;
1762 }
1763
1764 static void br_multicast_start_querier(struct net_bridge *br)
1765 {
1766 struct net_bridge_port *port;
1767
1768 br_multicast_open(br);
1769
1770 list_for_each_entry(port, &br->port_list, list) {
1771 if (port->state == BR_STATE_DISABLED ||
1772 port->state == BR_STATE_BLOCKING)
1773 continue;
1774
1775 __br_multicast_enable_port(port);
1776 }
1777 }
1778
1779 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1780 {
1781 int err = 0;
1782 struct net_bridge_mdb_htable *mdb;
1783
1784 spin_lock_bh(&br->multicast_lock);
1785 if (br->multicast_disabled == !val)
1786 goto unlock;
1787
1788 br->multicast_disabled = !val;
1789 if (br->multicast_disabled)
1790 goto unlock;
1791
1792 if (!netif_running(br->dev))
1793 goto unlock;
1794
1795 mdb = mlock_dereference(br->mdb, br);
1796 if (mdb) {
1797 if (mdb->old) {
1798 err = -EEXIST;
1799 rollback:
1800 br->multicast_disabled = !!val;
1801 goto unlock;
1802 }
1803
1804 err = br_mdb_rehash(&br->mdb, mdb->max,
1805 br->hash_elasticity);
1806 if (err)
1807 goto rollback;
1808 }
1809
1810 br_multicast_start_querier(br);
1811
1812 unlock:
1813 spin_unlock_bh(&br->multicast_lock);
1814
1815 return err;
1816 }
1817
1818 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1819 {
1820 val = !!val;
1821
1822 spin_lock_bh(&br->multicast_lock);
1823 if (br->multicast_querier == val)
1824 goto unlock;
1825
1826 br->multicast_querier = val;
1827 if (val)
1828 br_multicast_start_querier(br);
1829
1830 unlock:
1831 spin_unlock_bh(&br->multicast_lock);
1832
1833 return 0;
1834 }
1835
1836 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1837 {
1838 int err = -ENOENT;
1839 u32 old;
1840 struct net_bridge_mdb_htable *mdb;
1841
1842 spin_lock(&br->multicast_lock);
1843 if (!netif_running(br->dev))
1844 goto unlock;
1845
1846 err = -EINVAL;
1847 if (!is_power_of_2(val))
1848 goto unlock;
1849
1850 mdb = mlock_dereference(br->mdb, br);
1851 if (mdb && val < mdb->size)
1852 goto unlock;
1853
1854 err = 0;
1855
1856 old = br->hash_max;
1857 br->hash_max = val;
1858
1859 if (mdb) {
1860 if (mdb->old) {
1861 err = -EEXIST;
1862 rollback:
1863 br->hash_max = old;
1864 goto unlock;
1865 }
1866
1867 err = br_mdb_rehash(&br->mdb, br->hash_max,
1868 br->hash_elasticity);
1869 if (err)
1870 goto rollback;
1871 }
1872
1873 unlock:
1874 spin_unlock(&br->multicast_lock);
1875
1876 return err;
1877 }
Linux kernel - Deliverables
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