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net:drivers/net: Miscellaneous conversions to ETH_ALEN
[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 <linux/inetdevice.h>
27 #include <net/ip.h>
28 #if IS_ENABLED(CONFIG_IPV6)
29 #include <net/ipv6.h>
30 #include <net/mld.h>
31 #include <net/ip6_checksum.h>
32 #include <net/addrconf.h>
33 #endif
34
35 #include "br_private.h"
36
37 static void br_multicast_start_querier(struct net_bridge *br,
38 struct bridge_mcast_query *query);
39 unsigned int br_mdb_rehash_seq;
40
41 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
42 {
43 if (a->proto != b->proto)
44 return 0;
45 if (a->vid != b->vid)
46 return 0;
47 switch (a->proto) {
48 case htons(ETH_P_IP):
49 return a->u.ip4 == b->u.ip4;
50 #if IS_ENABLED(CONFIG_IPV6)
51 case htons(ETH_P_IPV6):
52 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
53 #endif
54 }
55 return 0;
56 }
57
58 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
59 __u16 vid)
60 {
61 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
62 }
63
64 #if IS_ENABLED(CONFIG_IPV6)
65 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
66 const struct in6_addr *ip,
67 __u16 vid)
68 {
69 return jhash_2words(ipv6_addr_hash(ip), vid,
70 mdb->secret) & (mdb->max - 1);
71 }
72 #endif
73
74 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
75 struct br_ip *ip)
76 {
77 switch (ip->proto) {
78 case htons(ETH_P_IP):
79 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
80 #if IS_ENABLED(CONFIG_IPV6)
81 case htons(ETH_P_IPV6):
82 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
83 #endif
84 }
85 return 0;
86 }
87
88 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
89 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
90 {
91 struct net_bridge_mdb_entry *mp;
92
93 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
94 if (br_ip_equal(&mp->addr, dst))
95 return mp;
96 }
97
98 return NULL;
99 }
100
101 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
102 struct br_ip *dst)
103 {
104 if (!mdb)
105 return NULL;
106
107 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
108 }
109
110 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
111 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
112 {
113 struct br_ip br_dst;
114
115 br_dst.u.ip4 = dst;
116 br_dst.proto = htons(ETH_P_IP);
117 br_dst.vid = vid;
118
119 return br_mdb_ip_get(mdb, &br_dst);
120 }
121
122 #if IS_ENABLED(CONFIG_IPV6)
123 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
124 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
125 __u16 vid)
126 {
127 struct br_ip br_dst;
128
129 br_dst.u.ip6 = *dst;
130 br_dst.proto = htons(ETH_P_IPV6);
131 br_dst.vid = vid;
132
133 return br_mdb_ip_get(mdb, &br_dst);
134 }
135 #endif
136
137 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
138 struct sk_buff *skb, u16 vid)
139 {
140 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
141 struct br_ip ip;
142
143 if (br->multicast_disabled)
144 return NULL;
145
146 if (BR_INPUT_SKB_CB(skb)->igmp)
147 return NULL;
148
149 ip.proto = skb->protocol;
150 ip.vid = vid;
151
152 switch (skb->protocol) {
153 case htons(ETH_P_IP):
154 ip.u.ip4 = ip_hdr(skb)->daddr;
155 break;
156 #if IS_ENABLED(CONFIG_IPV6)
157 case htons(ETH_P_IPV6):
158 ip.u.ip6 = ipv6_hdr(skb)->daddr;
159 break;
160 #endif
161 default:
162 return NULL;
163 }
164
165 return br_mdb_ip_get(mdb, &ip);
166 }
167
168 static void br_mdb_free(struct rcu_head *head)
169 {
170 struct net_bridge_mdb_htable *mdb =
171 container_of(head, struct net_bridge_mdb_htable, rcu);
172 struct net_bridge_mdb_htable *old = mdb->old;
173
174 mdb->old = NULL;
175 kfree(old->mhash);
176 kfree(old);
177 }
178
179 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
180 struct net_bridge_mdb_htable *old,
181 int elasticity)
182 {
183 struct net_bridge_mdb_entry *mp;
184 int maxlen;
185 int len;
186 int i;
187
188 for (i = 0; i < old->max; i++)
189 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
190 hlist_add_head(&mp->hlist[new->ver],
191 &new->mhash[br_ip_hash(new, &mp->addr)]);
192
193 if (!elasticity)
194 return 0;
195
196 maxlen = 0;
197 for (i = 0; i < new->max; i++) {
198 len = 0;
199 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
200 len++;
201 if (len > maxlen)
202 maxlen = len;
203 }
204
205 return maxlen > elasticity ? -EINVAL : 0;
206 }
207
208 void br_multicast_free_pg(struct rcu_head *head)
209 {
210 struct net_bridge_port_group *p =
211 container_of(head, struct net_bridge_port_group, rcu);
212
213 kfree(p);
214 }
215
216 static void br_multicast_free_group(struct rcu_head *head)
217 {
218 struct net_bridge_mdb_entry *mp =
219 container_of(head, struct net_bridge_mdb_entry, rcu);
220
221 kfree(mp);
222 }
223
224 static void br_multicast_group_expired(unsigned long data)
225 {
226 struct net_bridge_mdb_entry *mp = (void *)data;
227 struct net_bridge *br = mp->br;
228 struct net_bridge_mdb_htable *mdb;
229
230 spin_lock(&br->multicast_lock);
231 if (!netif_running(br->dev) || timer_pending(&mp->timer))
232 goto out;
233
234 mp->mglist = false;
235
236 if (mp->ports)
237 goto out;
238
239 mdb = mlock_dereference(br->mdb, br);
240
241 hlist_del_rcu(&mp->hlist[mdb->ver]);
242 mdb->size--;
243
244 call_rcu_bh(&mp->rcu, br_multicast_free_group);
245
246 out:
247 spin_unlock(&br->multicast_lock);
248 }
249
250 static void br_multicast_del_pg(struct net_bridge *br,
251 struct net_bridge_port_group *pg)
252 {
253 struct net_bridge_mdb_htable *mdb;
254 struct net_bridge_mdb_entry *mp;
255 struct net_bridge_port_group *p;
256 struct net_bridge_port_group __rcu **pp;
257
258 mdb = mlock_dereference(br->mdb, br);
259
260 mp = br_mdb_ip_get(mdb, &pg->addr);
261 if (WARN_ON(!mp))
262 return;
263
264 for (pp = &mp->ports;
265 (p = mlock_dereference(*pp, br)) != NULL;
266 pp = &p->next) {
267 if (p != pg)
268 continue;
269
270 rcu_assign_pointer(*pp, p->next);
271 hlist_del_init(&p->mglist);
272 del_timer(&p->timer);
273 call_rcu_bh(&p->rcu, br_multicast_free_pg);
274
275 if (!mp->ports && !mp->mglist && mp->timer_armed &&
276 netif_running(br->dev))
277 mod_timer(&mp->timer, jiffies);
278
279 return;
280 }
281
282 WARN_ON(1);
283 }
284
285 static void br_multicast_port_group_expired(unsigned long data)
286 {
287 struct net_bridge_port_group *pg = (void *)data;
288 struct net_bridge *br = pg->port->br;
289
290 spin_lock(&br->multicast_lock);
291 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
292 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
293 goto out;
294
295 br_multicast_del_pg(br, pg);
296
297 out:
298 spin_unlock(&br->multicast_lock);
299 }
300
301 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
302 int elasticity)
303 {
304 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
305 struct net_bridge_mdb_htable *mdb;
306 int err;
307
308 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
309 if (!mdb)
310 return -ENOMEM;
311
312 mdb->max = max;
313 mdb->old = old;
314
315 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
316 if (!mdb->mhash) {
317 kfree(mdb);
318 return -ENOMEM;
319 }
320
321 mdb->size = old ? old->size : 0;
322 mdb->ver = old ? old->ver ^ 1 : 0;
323
324 if (!old || elasticity)
325 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
326 else
327 mdb->secret = old->secret;
328
329 if (!old)
330 goto out;
331
332 err = br_mdb_copy(mdb, old, elasticity);
333 if (err) {
334 kfree(mdb->mhash);
335 kfree(mdb);
336 return err;
337 }
338
339 br_mdb_rehash_seq++;
340 call_rcu_bh(&mdb->rcu, br_mdb_free);
341
342 out:
343 rcu_assign_pointer(*mdbp, mdb);
344
345 return 0;
346 }
347
348 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
349 __be32 group)
350 {
351 struct sk_buff *skb;
352 struct igmphdr *ih;
353 struct ethhdr *eth;
354 struct iphdr *iph;
355
356 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
357 sizeof(*ih) + 4);
358 if (!skb)
359 goto out;
360
361 skb->protocol = htons(ETH_P_IP);
362
363 skb_reset_mac_header(skb);
364 eth = eth_hdr(skb);
365
366 memcpy(eth->h_source, br->dev->dev_addr, ETH_ALEN);
367 eth->h_dest[0] = 1;
368 eth->h_dest[1] = 0;
369 eth->h_dest[2] = 0x5e;
370 eth->h_dest[3] = 0;
371 eth->h_dest[4] = 0;
372 eth->h_dest[5] = 1;
373 eth->h_proto = htons(ETH_P_IP);
374 skb_put(skb, sizeof(*eth));
375
376 skb_set_network_header(skb, skb->len);
377 iph = ip_hdr(skb);
378
379 iph->version = 4;
380 iph->ihl = 6;
381 iph->tos = 0xc0;
382 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
383 iph->id = 0;
384 iph->frag_off = htons(IP_DF);
385 iph->ttl = 1;
386 iph->protocol = IPPROTO_IGMP;
387 iph->saddr = br->multicast_query_use_ifaddr ?
388 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
389 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
390 ((u8 *)&iph[1])[0] = IPOPT_RA;
391 ((u8 *)&iph[1])[1] = 4;
392 ((u8 *)&iph[1])[2] = 0;
393 ((u8 *)&iph[1])[3] = 0;
394 ip_send_check(iph);
395 skb_put(skb, 24);
396
397 skb_set_transport_header(skb, skb->len);
398 ih = igmp_hdr(skb);
399 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
400 ih->code = (group ? br->multicast_last_member_interval :
401 br->multicast_query_response_interval) /
402 (HZ / IGMP_TIMER_SCALE);
403 ih->group = group;
404 ih->csum = 0;
405 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
406 skb_put(skb, sizeof(*ih));
407
408 __skb_pull(skb, sizeof(*eth));
409
410 out:
411 return skb;
412 }
413
414 #if IS_ENABLED(CONFIG_IPV6)
415 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
416 const struct in6_addr *group)
417 {
418 struct sk_buff *skb;
419 struct ipv6hdr *ip6h;
420 struct mld_msg *mldq;
421 struct ethhdr *eth;
422 u8 *hopopt;
423 unsigned long interval;
424
425 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
426 8 + sizeof(*mldq));
427 if (!skb)
428 goto out;
429
430 skb->protocol = htons(ETH_P_IPV6);
431
432 /* Ethernet header */
433 skb_reset_mac_header(skb);
434 eth = eth_hdr(skb);
435
436 memcpy(eth->h_source, br->dev->dev_addr, ETH_ALEN);
437 eth->h_proto = htons(ETH_P_IPV6);
438 skb_put(skb, sizeof(*eth));
439
440 /* IPv6 header + HbH option */
441 skb_set_network_header(skb, skb->len);
442 ip6h = ipv6_hdr(skb);
443
444 *(__force __be32 *)ip6h = htonl(0x60000000);
445 ip6h->payload_len = htons(8 + sizeof(*mldq));
446 ip6h->nexthdr = IPPROTO_HOPOPTS;
447 ip6h->hop_limit = 1;
448 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
449 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
450 &ip6h->saddr)) {
451 kfree_skb(skb);
452 return NULL;
453 }
454 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
455
456 hopopt = (u8 *)(ip6h + 1);
457 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
458 hopopt[1] = 0; /* length of HbH */
459 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
460 hopopt[3] = 2; /* Length of RA Option */
461 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
462 hopopt[5] = 0;
463 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
464 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
465
466 skb_put(skb, sizeof(*ip6h) + 8);
467
468 /* ICMPv6 */
469 skb_set_transport_header(skb, skb->len);
470 mldq = (struct mld_msg *) icmp6_hdr(skb);
471
472 interval = ipv6_addr_any(group) ?
473 br->multicast_query_response_interval :
474 br->multicast_last_member_interval;
475
476 mldq->mld_type = ICMPV6_MGM_QUERY;
477 mldq->mld_code = 0;
478 mldq->mld_cksum = 0;
479 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
480 mldq->mld_reserved = 0;
481 mldq->mld_mca = *group;
482
483 /* checksum */
484 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
485 sizeof(*mldq), IPPROTO_ICMPV6,
486 csum_partial(mldq,
487 sizeof(*mldq), 0));
488 skb_put(skb, sizeof(*mldq));
489
490 __skb_pull(skb, sizeof(*eth));
491
492 out:
493 return skb;
494 }
495 #endif
496
497 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
498 struct br_ip *addr)
499 {
500 switch (addr->proto) {
501 case htons(ETH_P_IP):
502 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
503 #if IS_ENABLED(CONFIG_IPV6)
504 case htons(ETH_P_IPV6):
505 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
506 #endif
507 }
508 return NULL;
509 }
510
511 static struct net_bridge_mdb_entry *br_multicast_get_group(
512 struct net_bridge *br, struct net_bridge_port *port,
513 struct br_ip *group, int hash)
514 {
515 struct net_bridge_mdb_htable *mdb;
516 struct net_bridge_mdb_entry *mp;
517 unsigned int count = 0;
518 unsigned int max;
519 int elasticity;
520 int err;
521
522 mdb = rcu_dereference_protected(br->mdb, 1);
523 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
524 count++;
525 if (unlikely(br_ip_equal(group, &mp->addr)))
526 return mp;
527 }
528
529 elasticity = 0;
530 max = mdb->max;
531
532 if (unlikely(count > br->hash_elasticity && count)) {
533 if (net_ratelimit())
534 br_info(br, "Multicast hash table "
535 "chain limit reached: %s\n",
536 port ? port->dev->name : br->dev->name);
537
538 elasticity = br->hash_elasticity;
539 }
540
541 if (mdb->size >= max) {
542 max *= 2;
543 if (unlikely(max > br->hash_max)) {
544 br_warn(br, "Multicast hash table maximum of %d "
545 "reached, disabling snooping: %s\n",
546 br->hash_max,
547 port ? port->dev->name : br->dev->name);
548 err = -E2BIG;
549 disable:
550 br->multicast_disabled = 1;
551 goto err;
552 }
553 }
554
555 if (max > mdb->max || elasticity) {
556 if (mdb->old) {
557 if (net_ratelimit())
558 br_info(br, "Multicast hash table "
559 "on fire: %s\n",
560 port ? port->dev->name : br->dev->name);
561 err = -EEXIST;
562 goto err;
563 }
564
565 err = br_mdb_rehash(&br->mdb, max, elasticity);
566 if (err) {
567 br_warn(br, "Cannot rehash multicast "
568 "hash table, disabling snooping: %s, %d, %d\n",
569 port ? port->dev->name : br->dev->name,
570 mdb->size, err);
571 goto disable;
572 }
573
574 err = -EAGAIN;
575 goto err;
576 }
577
578 return NULL;
579
580 err:
581 mp = ERR_PTR(err);
582 return mp;
583 }
584
585 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
586 struct net_bridge_port *port, struct br_ip *group)
587 {
588 struct net_bridge_mdb_htable *mdb;
589 struct net_bridge_mdb_entry *mp;
590 int hash;
591 int err;
592
593 mdb = rcu_dereference_protected(br->mdb, 1);
594 if (!mdb) {
595 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
596 if (err)
597 return ERR_PTR(err);
598 goto rehash;
599 }
600
601 hash = br_ip_hash(mdb, group);
602 mp = br_multicast_get_group(br, port, group, hash);
603 switch (PTR_ERR(mp)) {
604 case 0:
605 break;
606
607 case -EAGAIN:
608 rehash:
609 mdb = rcu_dereference_protected(br->mdb, 1);
610 hash = br_ip_hash(mdb, group);
611 break;
612
613 default:
614 goto out;
615 }
616
617 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
618 if (unlikely(!mp))
619 return ERR_PTR(-ENOMEM);
620
621 mp->br = br;
622 mp->addr = *group;
623
624 setup_timer(&mp->timer, br_multicast_group_expired,
625 (unsigned long)mp);
626
627 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
628 mdb->size++;
629
630 out:
631 return mp;
632 }
633
634 struct net_bridge_port_group *br_multicast_new_port_group(
635 struct net_bridge_port *port,
636 struct br_ip *group,
637 struct net_bridge_port_group __rcu *next,
638 unsigned char state)
639 {
640 struct net_bridge_port_group *p;
641
642 p = kzalloc(sizeof(*p), GFP_ATOMIC);
643 if (unlikely(!p))
644 return NULL;
645
646 p->addr = *group;
647 p->port = port;
648 p->state = state;
649 rcu_assign_pointer(p->next, next);
650 hlist_add_head(&p->mglist, &port->mglist);
651 setup_timer(&p->timer, br_multicast_port_group_expired,
652 (unsigned long)p);
653 return p;
654 }
655
656 static int br_multicast_add_group(struct net_bridge *br,
657 struct net_bridge_port *port,
658 struct br_ip *group)
659 {
660 struct net_bridge_mdb_entry *mp;
661 struct net_bridge_port_group *p;
662 struct net_bridge_port_group __rcu **pp;
663 int err;
664
665 spin_lock(&br->multicast_lock);
666 if (!netif_running(br->dev) ||
667 (port && port->state == BR_STATE_DISABLED))
668 goto out;
669
670 mp = br_multicast_new_group(br, port, group);
671 err = PTR_ERR(mp);
672 if (IS_ERR(mp))
673 goto err;
674
675 if (!port) {
676 mp->mglist = true;
677 goto out;
678 }
679
680 for (pp = &mp->ports;
681 (p = mlock_dereference(*pp, br)) != NULL;
682 pp = &p->next) {
683 if (p->port == port)
684 goto out;
685 if ((unsigned long)p->port < (unsigned long)port)
686 break;
687 }
688
689 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
690 if (unlikely(!p))
691 goto err;
692 rcu_assign_pointer(*pp, p);
693 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
694
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_addr_is_ll_all_nodes(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(struct net_bridge *br,
761 struct bridge_mcast_query *query)
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, query);
768
769 out:
770 spin_unlock(&br->multicast_lock);
771 }
772
773 static void br_ip4_multicast_querier_expired(unsigned long data)
774 {
775 struct net_bridge *br = (void *)data;
776
777 br_multicast_querier_expired(br, &br->ip4_query);
778 }
779
780 #if IS_ENABLED(CONFIG_IPV6)
781 static void br_ip6_multicast_querier_expired(unsigned long data)
782 {
783 struct net_bridge *br = (void *)data;
784
785 br_multicast_querier_expired(br, &br->ip6_query);
786 }
787 #endif
788
789 static void __br_multicast_send_query(struct net_bridge *br,
790 struct net_bridge_port *port,
791 struct br_ip *ip)
792 {
793 struct sk_buff *skb;
794
795 skb = br_multicast_alloc_query(br, ip);
796 if (!skb)
797 return;
798
799 if (port) {
800 __skb_push(skb, sizeof(struct ethhdr));
801 skb->dev = port->dev;
802 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
803 dev_queue_xmit);
804 } else
805 netif_rx(skb);
806 }
807
808 static void br_multicast_send_query(struct net_bridge *br,
809 struct net_bridge_port *port,
810 struct bridge_mcast_query *query)
811 {
812 unsigned long time;
813 struct br_ip br_group;
814 struct bridge_mcast_querier *querier = NULL;
815
816 if (!netif_running(br->dev) || br->multicast_disabled ||
817 !br->multicast_querier)
818 return;
819
820 memset(&br_group.u, 0, sizeof(br_group.u));
821
822 if (port ? (query == &port->ip4_query) :
823 (query == &br->ip4_query)) {
824 querier = &br->ip4_querier;
825 br_group.proto = htons(ETH_P_IP);
826 #if IS_ENABLED(CONFIG_IPV6)
827 } else {
828 querier = &br->ip6_querier;
829 br_group.proto = htons(ETH_P_IPV6);
830 #endif
831 }
832
833 if (!querier || timer_pending(&querier->timer))
834 return;
835
836 __br_multicast_send_query(br, port, &br_group);
837
838 time = jiffies;
839 time += query->startup_sent < br->multicast_startup_query_count ?
840 br->multicast_startup_query_interval :
841 br->multicast_query_interval;
842 mod_timer(&query->timer, time);
843 }
844
845 static void br_multicast_port_query_expired(struct net_bridge_port *port,
846 struct bridge_mcast_query *query)
847 {
848 struct net_bridge *br = port->br;
849
850 spin_lock(&br->multicast_lock);
851 if (port->state == BR_STATE_DISABLED ||
852 port->state == BR_STATE_BLOCKING)
853 goto out;
854
855 if (query->startup_sent < br->multicast_startup_query_count)
856 query->startup_sent++;
857
858 br_multicast_send_query(port->br, port, query);
859
860 out:
861 spin_unlock(&br->multicast_lock);
862 }
863
864 static void br_ip4_multicast_port_query_expired(unsigned long data)
865 {
866 struct net_bridge_port *port = (void *)data;
867
868 br_multicast_port_query_expired(port, &port->ip4_query);
869 }
870
871 #if IS_ENABLED(CONFIG_IPV6)
872 static void br_ip6_multicast_port_query_expired(unsigned long data)
873 {
874 struct net_bridge_port *port = (void *)data;
875
876 br_multicast_port_query_expired(port, &port->ip6_query);
877 }
878 #endif
879
880 void br_multicast_add_port(struct net_bridge_port *port)
881 {
882 port->multicast_router = 1;
883
884 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
885 (unsigned long)port);
886 setup_timer(&port->ip4_query.timer, br_ip4_multicast_port_query_expired,
887 (unsigned long)port);
888 #if IS_ENABLED(CONFIG_IPV6)
889 setup_timer(&port->ip6_query.timer, br_ip6_multicast_port_query_expired,
890 (unsigned long)port);
891 #endif
892 }
893
894 void br_multicast_del_port(struct net_bridge_port *port)
895 {
896 del_timer_sync(&port->multicast_router_timer);
897 }
898
899 static void br_multicast_enable(struct bridge_mcast_query *query)
900 {
901 query->startup_sent = 0;
902
903 if (try_to_del_timer_sync(&query->timer) >= 0 ||
904 del_timer(&query->timer))
905 mod_timer(&query->timer, jiffies);
906 }
907
908 void br_multicast_enable_port(struct net_bridge_port *port)
909 {
910 struct net_bridge *br = port->br;
911
912 spin_lock(&br->multicast_lock);
913 if (br->multicast_disabled || !netif_running(br->dev))
914 goto out;
915
916 br_multicast_enable(&port->ip4_query);
917 #if IS_ENABLED(CONFIG_IPV6)
918 br_multicast_enable(&port->ip6_query);
919 #endif
920
921 out:
922 spin_unlock(&br->multicast_lock);
923 }
924
925 void br_multicast_disable_port(struct net_bridge_port *port)
926 {
927 struct net_bridge *br = port->br;
928 struct net_bridge_port_group *pg;
929 struct hlist_node *n;
930
931 spin_lock(&br->multicast_lock);
932 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
933 br_multicast_del_pg(br, pg);
934
935 if (!hlist_unhashed(&port->rlist))
936 hlist_del_init_rcu(&port->rlist);
937 del_timer(&port->multicast_router_timer);
938 del_timer(&port->ip4_query.timer);
939 #if IS_ENABLED(CONFIG_IPV6)
940 del_timer(&port->ip6_query.timer);
941 #endif
942 spin_unlock(&br->multicast_lock);
943 }
944
945 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
946 struct net_bridge_port *port,
947 struct sk_buff *skb)
948 {
949 struct igmpv3_report *ih;
950 struct igmpv3_grec *grec;
951 int i;
952 int len;
953 int num;
954 int type;
955 int err = 0;
956 __be32 group;
957 u16 vid = 0;
958
959 if (!pskb_may_pull(skb, sizeof(*ih)))
960 return -EINVAL;
961
962 br_vlan_get_tag(skb, &vid);
963 ih = igmpv3_report_hdr(skb);
964 num = ntohs(ih->ngrec);
965 len = sizeof(*ih);
966
967 for (i = 0; i < num; i++) {
968 len += sizeof(*grec);
969 if (!pskb_may_pull(skb, len))
970 return -EINVAL;
971
972 grec = (void *)(skb->data + len - sizeof(*grec));
973 group = grec->grec_mca;
974 type = grec->grec_type;
975
976 len += ntohs(grec->grec_nsrcs) * 4;
977 if (!pskb_may_pull(skb, len))
978 return -EINVAL;
979
980 /* We treat this as an IGMPv2 report for now. */
981 switch (type) {
982 case IGMPV3_MODE_IS_INCLUDE:
983 case IGMPV3_MODE_IS_EXCLUDE:
984 case IGMPV3_CHANGE_TO_INCLUDE:
985 case IGMPV3_CHANGE_TO_EXCLUDE:
986 case IGMPV3_ALLOW_NEW_SOURCES:
987 case IGMPV3_BLOCK_OLD_SOURCES:
988 break;
989
990 default:
991 continue;
992 }
993
994 err = br_ip4_multicast_add_group(br, port, group, vid);
995 if (err)
996 break;
997 }
998
999 return err;
1000 }
1001
1002 #if IS_ENABLED(CONFIG_IPV6)
1003 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1004 struct net_bridge_port *port,
1005 struct sk_buff *skb)
1006 {
1007 struct icmp6hdr *icmp6h;
1008 struct mld2_grec *grec;
1009 int i;
1010 int len;
1011 int num;
1012 int err = 0;
1013 u16 vid = 0;
1014
1015 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1016 return -EINVAL;
1017
1018 br_vlan_get_tag(skb, &vid);
1019 icmp6h = icmp6_hdr(skb);
1020 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1021 len = sizeof(*icmp6h);
1022
1023 for (i = 0; i < num; i++) {
1024 __be16 *nsrcs, _nsrcs;
1025
1026 nsrcs = skb_header_pointer(skb,
1027 len + offsetof(struct mld2_grec,
1028 grec_nsrcs),
1029 sizeof(_nsrcs), &_nsrcs);
1030 if (!nsrcs)
1031 return -EINVAL;
1032
1033 if (!pskb_may_pull(skb,
1034 len + sizeof(*grec) +
1035 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1036 return -EINVAL;
1037
1038 grec = (struct mld2_grec *)(skb->data + len);
1039 len += sizeof(*grec) +
1040 sizeof(struct in6_addr) * ntohs(*nsrcs);
1041
1042 /* We treat these as MLDv1 reports for now. */
1043 switch (grec->grec_type) {
1044 case MLD2_MODE_IS_INCLUDE:
1045 case MLD2_MODE_IS_EXCLUDE:
1046 case MLD2_CHANGE_TO_INCLUDE:
1047 case MLD2_CHANGE_TO_EXCLUDE:
1048 case MLD2_ALLOW_NEW_SOURCES:
1049 case MLD2_BLOCK_OLD_SOURCES:
1050 break;
1051
1052 default:
1053 continue;
1054 }
1055
1056 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1057 vid);
1058 if (!err)
1059 break;
1060 }
1061
1062 return err;
1063 }
1064 #endif
1065
1066 static void
1067 br_multicast_update_querier_timer(struct net_bridge *br,
1068 struct bridge_mcast_querier *querier,
1069 unsigned long max_delay)
1070 {
1071 if (!timer_pending(&querier->timer))
1072 querier->delay_time = jiffies + max_delay;
1073
1074 mod_timer(&querier->timer, jiffies + br->multicast_querier_interval);
1075 }
1076
1077 /*
1078 * Add port to router_list
1079 * list is maintained ordered by pointer value
1080 * and locked by br->multicast_lock and RCU
1081 */
1082 static void br_multicast_add_router(struct net_bridge *br,
1083 struct net_bridge_port *port)
1084 {
1085 struct net_bridge_port *p;
1086 struct hlist_node *slot = NULL;
1087
1088 hlist_for_each_entry(p, &br->router_list, rlist) {
1089 if ((unsigned long) port >= (unsigned long) p)
1090 break;
1091 slot = &p->rlist;
1092 }
1093
1094 if (slot)
1095 hlist_add_after_rcu(slot, &port->rlist);
1096 else
1097 hlist_add_head_rcu(&port->rlist, &br->router_list);
1098 }
1099
1100 static void br_multicast_mark_router(struct net_bridge *br,
1101 struct net_bridge_port *port)
1102 {
1103 unsigned long now = jiffies;
1104
1105 if (!port) {
1106 if (br->multicast_router == 1)
1107 mod_timer(&br->multicast_router_timer,
1108 now + br->multicast_querier_interval);
1109 return;
1110 }
1111
1112 if (port->multicast_router != 1)
1113 return;
1114
1115 if (!hlist_unhashed(&port->rlist))
1116 goto timer;
1117
1118 br_multicast_add_router(br, port);
1119
1120 timer:
1121 mod_timer(&port->multicast_router_timer,
1122 now + br->multicast_querier_interval);
1123 }
1124
1125 static void br_multicast_query_received(struct net_bridge *br,
1126 struct net_bridge_port *port,
1127 struct bridge_mcast_querier *querier,
1128 int saddr,
1129 unsigned long max_delay)
1130 {
1131 if (saddr)
1132 br_multicast_update_querier_timer(br, querier, max_delay);
1133 else if (timer_pending(&querier->timer))
1134 return;
1135
1136 br_multicast_mark_router(br, port);
1137 }
1138
1139 static int br_ip4_multicast_query(struct net_bridge *br,
1140 struct net_bridge_port *port,
1141 struct sk_buff *skb)
1142 {
1143 const struct iphdr *iph = ip_hdr(skb);
1144 struct igmphdr *ih = igmp_hdr(skb);
1145 struct net_bridge_mdb_entry *mp;
1146 struct igmpv3_query *ih3;
1147 struct net_bridge_port_group *p;
1148 struct net_bridge_port_group __rcu **pp;
1149 unsigned long max_delay;
1150 unsigned long now = jiffies;
1151 __be32 group;
1152 int err = 0;
1153 u16 vid = 0;
1154
1155 spin_lock(&br->multicast_lock);
1156 if (!netif_running(br->dev) ||
1157 (port && port->state == BR_STATE_DISABLED))
1158 goto out;
1159
1160 group = ih->group;
1161
1162 if (skb->len == sizeof(*ih)) {
1163 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1164
1165 if (!max_delay) {
1166 max_delay = 10 * HZ;
1167 group = 0;
1168 }
1169 } else {
1170 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1171 err = -EINVAL;
1172 goto out;
1173 }
1174
1175 ih3 = igmpv3_query_hdr(skb);
1176 if (ih3->nsrcs)
1177 goto out;
1178
1179 max_delay = ih3->code ?
1180 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1181 }
1182
1183 br_multicast_query_received(br, port, &br->ip4_querier, !!iph->saddr,
1184 max_delay);
1185
1186 if (!group)
1187 goto out;
1188
1189 br_vlan_get_tag(skb, &vid);
1190 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1191 if (!mp)
1192 goto out;
1193
1194 mod_timer(&mp->timer, now + br->multicast_membership_interval);
1195 mp->timer_armed = true;
1196
1197 max_delay *= br->multicast_last_member_count;
1198
1199 if (mp->mglist &&
1200 (timer_pending(&mp->timer) ?
1201 time_after(mp->timer.expires, now + max_delay) :
1202 try_to_del_timer_sync(&mp->timer) >= 0))
1203 mod_timer(&mp->timer, now + max_delay);
1204
1205 for (pp = &mp->ports;
1206 (p = mlock_dereference(*pp, br)) != NULL;
1207 pp = &p->next) {
1208 if (timer_pending(&p->timer) ?
1209 time_after(p->timer.expires, now + max_delay) :
1210 try_to_del_timer_sync(&p->timer) >= 0)
1211 mod_timer(&p->timer, now + max_delay);
1212 }
1213
1214 out:
1215 spin_unlock(&br->multicast_lock);
1216 return err;
1217 }
1218
1219 #if IS_ENABLED(CONFIG_IPV6)
1220 static int br_ip6_multicast_query(struct net_bridge *br,
1221 struct net_bridge_port *port,
1222 struct sk_buff *skb)
1223 {
1224 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1225 struct mld_msg *mld;
1226 struct net_bridge_mdb_entry *mp;
1227 struct mld2_query *mld2q;
1228 struct net_bridge_port_group *p;
1229 struct net_bridge_port_group __rcu **pp;
1230 unsigned long max_delay;
1231 unsigned long now = jiffies;
1232 const struct in6_addr *group = NULL;
1233 int err = 0;
1234 u16 vid = 0;
1235
1236 spin_lock(&br->multicast_lock);
1237 if (!netif_running(br->dev) ||
1238 (port && port->state == BR_STATE_DISABLED))
1239 goto out;
1240
1241 if (skb->len == sizeof(*mld)) {
1242 if (!pskb_may_pull(skb, sizeof(*mld))) {
1243 err = -EINVAL;
1244 goto out;
1245 }
1246 mld = (struct mld_msg *) icmp6_hdr(skb);
1247 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1248 if (max_delay)
1249 group = &mld->mld_mca;
1250 } else {
1251 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1252 err = -EINVAL;
1253 goto out;
1254 }
1255 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1256 if (!mld2q->mld2q_nsrcs)
1257 group = &mld2q->mld2q_mca;
1258
1259 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1260 }
1261
1262 br_multicast_query_received(br, port, &br->ip6_querier,
1263 !ipv6_addr_any(&ip6h->saddr), max_delay);
1264
1265 if (!group)
1266 goto out;
1267
1268 br_vlan_get_tag(skb, &vid);
1269 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1270 if (!mp)
1271 goto out;
1272
1273 mod_timer(&mp->timer, now + br->multicast_membership_interval);
1274 mp->timer_armed = true;
1275
1276 max_delay *= br->multicast_last_member_count;
1277 if (mp->mglist &&
1278 (timer_pending(&mp->timer) ?
1279 time_after(mp->timer.expires, now + max_delay) :
1280 try_to_del_timer_sync(&mp->timer) >= 0))
1281 mod_timer(&mp->timer, now + max_delay);
1282
1283 for (pp = &mp->ports;
1284 (p = mlock_dereference(*pp, br)) != NULL;
1285 pp = &p->next) {
1286 if (timer_pending(&p->timer) ?
1287 time_after(p->timer.expires, now + max_delay) :
1288 try_to_del_timer_sync(&p->timer) >= 0)
1289 mod_timer(&p->timer, now + max_delay);
1290 }
1291
1292 out:
1293 spin_unlock(&br->multicast_lock);
1294 return err;
1295 }
1296 #endif
1297
1298 static void br_multicast_leave_group(struct net_bridge *br,
1299 struct net_bridge_port *port,
1300 struct br_ip *group,
1301 struct bridge_mcast_querier *querier,
1302 struct bridge_mcast_query *query)
1303 {
1304 struct net_bridge_mdb_htable *mdb;
1305 struct net_bridge_mdb_entry *mp;
1306 struct net_bridge_port_group *p;
1307 unsigned long now;
1308 unsigned long time;
1309
1310 spin_lock(&br->multicast_lock);
1311 if (!netif_running(br->dev) ||
1312 (port && port->state == BR_STATE_DISABLED) ||
1313 timer_pending(&querier->timer))
1314 goto out;
1315
1316 mdb = mlock_dereference(br->mdb, br);
1317 mp = br_mdb_ip_get(mdb, group);
1318 if (!mp)
1319 goto out;
1320
1321 if (br->multicast_querier) {
1322 __br_multicast_send_query(br, port, &mp->addr);
1323
1324 time = jiffies + br->multicast_last_member_count *
1325 br->multicast_last_member_interval;
1326
1327 mod_timer(&query->timer, time);
1328
1329 for (p = mlock_dereference(mp->ports, br);
1330 p != NULL;
1331 p = mlock_dereference(p->next, br)) {
1332 if (p->port != port)
1333 continue;
1334
1335 if (!hlist_unhashed(&p->mglist) &&
1336 (timer_pending(&p->timer) ?
1337 time_after(p->timer.expires, time) :
1338 try_to_del_timer_sync(&p->timer) >= 0)) {
1339 mod_timer(&p->timer, time);
1340 }
1341
1342 break;
1343 }
1344 }
1345
1346 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1347 struct net_bridge_port_group __rcu **pp;
1348
1349 for (pp = &mp->ports;
1350 (p = mlock_dereference(*pp, br)) != NULL;
1351 pp = &p->next) {
1352 if (p->port != port)
1353 continue;
1354
1355 rcu_assign_pointer(*pp, p->next);
1356 hlist_del_init(&p->mglist);
1357 del_timer(&p->timer);
1358 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1359 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1360
1361 if (!mp->ports && !mp->mglist && mp->timer_armed &&
1362 netif_running(br->dev))
1363 mod_timer(&mp->timer, jiffies);
1364 }
1365 goto out;
1366 }
1367
1368 now = jiffies;
1369 time = now + br->multicast_last_member_count *
1370 br->multicast_last_member_interval;
1371
1372 if (!port) {
1373 if (mp->mglist && mp->timer_armed &&
1374 (timer_pending(&mp->timer) ?
1375 time_after(mp->timer.expires, time) :
1376 try_to_del_timer_sync(&mp->timer) >= 0)) {
1377 mod_timer(&mp->timer, time);
1378 }
1379 }
1380 out:
1381 spin_unlock(&br->multicast_lock);
1382 }
1383
1384 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1385 struct net_bridge_port *port,
1386 __be32 group,
1387 __u16 vid)
1388 {
1389 struct br_ip br_group;
1390 struct bridge_mcast_query *query = port ? &port->ip4_query :
1391 &br->ip4_query;
1392
1393 if (ipv4_is_local_multicast(group))
1394 return;
1395
1396 br_group.u.ip4 = group;
1397 br_group.proto = htons(ETH_P_IP);
1398 br_group.vid = vid;
1399
1400 br_multicast_leave_group(br, port, &br_group, &br->ip4_querier, query);
1401 }
1402
1403 #if IS_ENABLED(CONFIG_IPV6)
1404 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1405 struct net_bridge_port *port,
1406 const struct in6_addr *group,
1407 __u16 vid)
1408 {
1409 struct br_ip br_group;
1410 struct bridge_mcast_query *query = port ? &port->ip6_query :
1411 &br->ip6_query;
1412
1413
1414 if (ipv6_addr_is_ll_all_nodes(group))
1415 return;
1416
1417 br_group.u.ip6 = *group;
1418 br_group.proto = htons(ETH_P_IPV6);
1419 br_group.vid = vid;
1420
1421 br_multicast_leave_group(br, port, &br_group, &br->ip6_querier, query);
1422 }
1423 #endif
1424
1425 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1426 struct net_bridge_port *port,
1427 struct sk_buff *skb)
1428 {
1429 struct sk_buff *skb2 = skb;
1430 const struct iphdr *iph;
1431 struct igmphdr *ih;
1432 unsigned int len;
1433 unsigned int offset;
1434 int err;
1435 u16 vid = 0;
1436
1437 /* We treat OOM as packet loss for now. */
1438 if (!pskb_may_pull(skb, sizeof(*iph)))
1439 return -EINVAL;
1440
1441 iph = ip_hdr(skb);
1442
1443 if (iph->ihl < 5 || iph->version != 4)
1444 return -EINVAL;
1445
1446 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1447 return -EINVAL;
1448
1449 iph = ip_hdr(skb);
1450
1451 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1452 return -EINVAL;
1453
1454 if (iph->protocol != IPPROTO_IGMP) {
1455 if (!ipv4_is_local_multicast(iph->daddr))
1456 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1457 return 0;
1458 }
1459
1460 len = ntohs(iph->tot_len);
1461 if (skb->len < len || len < ip_hdrlen(skb))
1462 return -EINVAL;
1463
1464 if (skb->len > len) {
1465 skb2 = skb_clone(skb, GFP_ATOMIC);
1466 if (!skb2)
1467 return -ENOMEM;
1468
1469 err = pskb_trim_rcsum(skb2, len);
1470 if (err)
1471 goto err_out;
1472 }
1473
1474 len -= ip_hdrlen(skb2);
1475 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1476 __skb_pull(skb2, offset);
1477 skb_reset_transport_header(skb2);
1478
1479 err = -EINVAL;
1480 if (!pskb_may_pull(skb2, sizeof(*ih)))
1481 goto out;
1482
1483 switch (skb2->ip_summed) {
1484 case CHECKSUM_COMPLETE:
1485 if (!csum_fold(skb2->csum))
1486 break;
1487 /* fall through */
1488 case CHECKSUM_NONE:
1489 skb2->csum = 0;
1490 if (skb_checksum_complete(skb2))
1491 goto out;
1492 }
1493
1494 err = 0;
1495
1496 br_vlan_get_tag(skb2, &vid);
1497 BR_INPUT_SKB_CB(skb)->igmp = 1;
1498 ih = igmp_hdr(skb2);
1499
1500 switch (ih->type) {
1501 case IGMP_HOST_MEMBERSHIP_REPORT:
1502 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1503 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1504 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1505 break;
1506 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1507 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1508 break;
1509 case IGMP_HOST_MEMBERSHIP_QUERY:
1510 err = br_ip4_multicast_query(br, port, skb2);
1511 break;
1512 case IGMP_HOST_LEAVE_MESSAGE:
1513 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1514 break;
1515 }
1516
1517 out:
1518 __skb_push(skb2, offset);
1519 err_out:
1520 if (skb2 != skb)
1521 kfree_skb(skb2);
1522 return err;
1523 }
1524
1525 #if IS_ENABLED(CONFIG_IPV6)
1526 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1527 struct net_bridge_port *port,
1528 struct sk_buff *skb)
1529 {
1530 struct sk_buff *skb2;
1531 const struct ipv6hdr *ip6h;
1532 u8 icmp6_type;
1533 u8 nexthdr;
1534 __be16 frag_off;
1535 unsigned int len;
1536 int offset;
1537 int err;
1538 u16 vid = 0;
1539
1540 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1541 return -EINVAL;
1542
1543 ip6h = ipv6_hdr(skb);
1544
1545 /*
1546 * We're interested in MLD messages only.
1547 * - Version is 6
1548 * - MLD has always Router Alert hop-by-hop option
1549 * - But we do not support jumbrograms.
1550 */
1551 if (ip6h->version != 6)
1552 return 0;
1553
1554 /* Prevent flooding this packet if there is no listener present */
1555 if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
1556 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1557
1558 if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
1559 ip6h->payload_len == 0)
1560 return 0;
1561
1562 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1563 if (skb->len < len)
1564 return -EINVAL;
1565
1566 nexthdr = ip6h->nexthdr;
1567 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1568
1569 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1570 return 0;
1571
1572 /* Okay, we found ICMPv6 header */
1573 skb2 = skb_clone(skb, GFP_ATOMIC);
1574 if (!skb2)
1575 return -ENOMEM;
1576
1577 err = -EINVAL;
1578 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1579 goto out;
1580
1581 len -= offset - skb_network_offset(skb2);
1582
1583 __skb_pull(skb2, offset);
1584 skb_reset_transport_header(skb2);
1585 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1586 skb_network_header_len(skb2));
1587
1588 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1589
1590 switch (icmp6_type) {
1591 case ICMPV6_MGM_QUERY:
1592 case ICMPV6_MGM_REPORT:
1593 case ICMPV6_MGM_REDUCTION:
1594 case ICMPV6_MLD2_REPORT:
1595 break;
1596 default:
1597 err = 0;
1598 goto out;
1599 }
1600
1601 /* Okay, we found MLD message. Check further. */
1602 if (skb2->len > len) {
1603 err = pskb_trim_rcsum(skb2, len);
1604 if (err)
1605 goto out;
1606 err = -EINVAL;
1607 }
1608
1609 ip6h = ipv6_hdr(skb2);
1610
1611 switch (skb2->ip_summed) {
1612 case CHECKSUM_COMPLETE:
1613 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1614 IPPROTO_ICMPV6, skb2->csum))
1615 break;
1616 /*FALLTHROUGH*/
1617 case CHECKSUM_NONE:
1618 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1619 &ip6h->daddr,
1620 skb2->len,
1621 IPPROTO_ICMPV6, 0));
1622 if (__skb_checksum_complete(skb2))
1623 goto out;
1624 }
1625
1626 err = 0;
1627
1628 br_vlan_get_tag(skb, &vid);
1629 BR_INPUT_SKB_CB(skb)->igmp = 1;
1630
1631 switch (icmp6_type) {
1632 case ICMPV6_MGM_REPORT:
1633 {
1634 struct mld_msg *mld;
1635 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1636 err = -EINVAL;
1637 goto out;
1638 }
1639 mld = (struct mld_msg *)skb_transport_header(skb2);
1640 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1641 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1642 break;
1643 }
1644 case ICMPV6_MLD2_REPORT:
1645 err = br_ip6_multicast_mld2_report(br, port, skb2);
1646 break;
1647 case ICMPV6_MGM_QUERY:
1648 err = br_ip6_multicast_query(br, port, skb2);
1649 break;
1650 case ICMPV6_MGM_REDUCTION:
1651 {
1652 struct mld_msg *mld;
1653 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1654 err = -EINVAL;
1655 goto out;
1656 }
1657 mld = (struct mld_msg *)skb_transport_header(skb2);
1658 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1659 }
1660 }
1661
1662 out:
1663 kfree_skb(skb2);
1664 return err;
1665 }
1666 #endif
1667
1668 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1669 struct sk_buff *skb)
1670 {
1671 BR_INPUT_SKB_CB(skb)->igmp = 0;
1672 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1673
1674 if (br->multicast_disabled)
1675 return 0;
1676
1677 switch (skb->protocol) {
1678 case htons(ETH_P_IP):
1679 return br_multicast_ipv4_rcv(br, port, skb);
1680 #if IS_ENABLED(CONFIG_IPV6)
1681 case htons(ETH_P_IPV6):
1682 return br_multicast_ipv6_rcv(br, port, skb);
1683 #endif
1684 }
1685
1686 return 0;
1687 }
1688
1689 static void br_multicast_query_expired(struct net_bridge *br,
1690 struct bridge_mcast_query *query)
1691 {
1692 spin_lock(&br->multicast_lock);
1693 if (query->startup_sent < br->multicast_startup_query_count)
1694 query->startup_sent++;
1695
1696 br_multicast_send_query(br, NULL, query);
1697 spin_unlock(&br->multicast_lock);
1698 }
1699
1700 static void br_ip4_multicast_query_expired(unsigned long data)
1701 {
1702 struct net_bridge *br = (void *)data;
1703
1704 br_multicast_query_expired(br, &br->ip4_query);
1705 }
1706
1707 #if IS_ENABLED(CONFIG_IPV6)
1708 static void br_ip6_multicast_query_expired(unsigned long data)
1709 {
1710 struct net_bridge *br = (void *)data;
1711
1712 br_multicast_query_expired(br, &br->ip6_query);
1713 }
1714 #endif
1715
1716 void br_multicast_init(struct net_bridge *br)
1717 {
1718 br->hash_elasticity = 4;
1719 br->hash_max = 512;
1720
1721 br->multicast_router = 1;
1722 br->multicast_querier = 0;
1723 br->multicast_query_use_ifaddr = 0;
1724 br->multicast_last_member_count = 2;
1725 br->multicast_startup_query_count = 2;
1726
1727 br->multicast_last_member_interval = HZ;
1728 br->multicast_query_response_interval = 10 * HZ;
1729 br->multicast_startup_query_interval = 125 * HZ / 4;
1730 br->multicast_query_interval = 125 * HZ;
1731 br->multicast_querier_interval = 255 * HZ;
1732 br->multicast_membership_interval = 260 * HZ;
1733
1734 br->ip4_querier.delay_time = 0;
1735 #if IS_ENABLED(CONFIG_IPV6)
1736 br->ip6_querier.delay_time = 0;
1737 #endif
1738
1739 spin_lock_init(&br->multicast_lock);
1740 setup_timer(&br->multicast_router_timer,
1741 br_multicast_local_router_expired, 0);
1742 setup_timer(&br->ip4_querier.timer, br_ip4_multicast_querier_expired,
1743 (unsigned long)br);
1744 setup_timer(&br->ip4_query.timer, br_ip4_multicast_query_expired,
1745 (unsigned long)br);
1746 #if IS_ENABLED(CONFIG_IPV6)
1747 setup_timer(&br->ip6_querier.timer, br_ip6_multicast_querier_expired,
1748 (unsigned long)br);
1749 setup_timer(&br->ip6_query.timer, br_ip6_multicast_query_expired,
1750 (unsigned long)br);
1751 #endif
1752 }
1753
1754 static void __br_multicast_open(struct net_bridge *br,
1755 struct bridge_mcast_query *query)
1756 {
1757 query->startup_sent = 0;
1758
1759 if (br->multicast_disabled)
1760 return;
1761
1762 mod_timer(&query->timer, jiffies);
1763 }
1764
1765 void br_multicast_open(struct net_bridge *br)
1766 {
1767 __br_multicast_open(br, &br->ip4_query);
1768 #if IS_ENABLED(CONFIG_IPV6)
1769 __br_multicast_open(br, &br->ip6_query);
1770 #endif
1771 }
1772
1773 void br_multicast_stop(struct net_bridge *br)
1774 {
1775 struct net_bridge_mdb_htable *mdb;
1776 struct net_bridge_mdb_entry *mp;
1777 struct hlist_node *n;
1778 u32 ver;
1779 int i;
1780
1781 del_timer_sync(&br->multicast_router_timer);
1782 del_timer_sync(&br->ip4_querier.timer);
1783 del_timer_sync(&br->ip4_query.timer);
1784 #if IS_ENABLED(CONFIG_IPV6)
1785 del_timer_sync(&br->ip6_querier.timer);
1786 del_timer_sync(&br->ip6_query.timer);
1787 #endif
1788
1789 spin_lock_bh(&br->multicast_lock);
1790 mdb = mlock_dereference(br->mdb, br);
1791 if (!mdb)
1792 goto out;
1793
1794 br->mdb = NULL;
1795
1796 ver = mdb->ver;
1797 for (i = 0; i < mdb->max; i++) {
1798 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1799 hlist[ver]) {
1800 del_timer(&mp->timer);
1801 mp->timer_armed = false;
1802 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1803 }
1804 }
1805
1806 if (mdb->old) {
1807 spin_unlock_bh(&br->multicast_lock);
1808 rcu_barrier_bh();
1809 spin_lock_bh(&br->multicast_lock);
1810 WARN_ON(mdb->old);
1811 }
1812
1813 mdb->old = mdb;
1814 call_rcu_bh(&mdb->rcu, br_mdb_free);
1815
1816 out:
1817 spin_unlock_bh(&br->multicast_lock);
1818 }
1819
1820 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1821 {
1822 int err = -ENOENT;
1823
1824 spin_lock_bh(&br->multicast_lock);
1825 if (!netif_running(br->dev))
1826 goto unlock;
1827
1828 switch (val) {
1829 case 0:
1830 case 2:
1831 del_timer(&br->multicast_router_timer);
1832 /* fall through */
1833 case 1:
1834 br->multicast_router = val;
1835 err = 0;
1836 break;
1837
1838 default:
1839 err = -EINVAL;
1840 break;
1841 }
1842
1843 unlock:
1844 spin_unlock_bh(&br->multicast_lock);
1845
1846 return err;
1847 }
1848
1849 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1850 {
1851 struct net_bridge *br = p->br;
1852 int err = -ENOENT;
1853
1854 spin_lock(&br->multicast_lock);
1855 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1856 goto unlock;
1857
1858 switch (val) {
1859 case 0:
1860 case 1:
1861 case 2:
1862 p->multicast_router = val;
1863 err = 0;
1864
1865 if (val < 2 && !hlist_unhashed(&p->rlist))
1866 hlist_del_init_rcu(&p->rlist);
1867
1868 if (val == 1)
1869 break;
1870
1871 del_timer(&p->multicast_router_timer);
1872
1873 if (val == 0)
1874 break;
1875
1876 br_multicast_add_router(br, p);
1877 break;
1878
1879 default:
1880 err = -EINVAL;
1881 break;
1882 }
1883
1884 unlock:
1885 spin_unlock(&br->multicast_lock);
1886
1887 return err;
1888 }
1889
1890 static void br_multicast_start_querier(struct net_bridge *br,
1891 struct bridge_mcast_query *query)
1892 {
1893 struct net_bridge_port *port;
1894
1895 __br_multicast_open(br, query);
1896
1897 list_for_each_entry(port, &br->port_list, list) {
1898 if (port->state == BR_STATE_DISABLED ||
1899 port->state == BR_STATE_BLOCKING)
1900 continue;
1901
1902 if (query == &br->ip4_query)
1903 br_multicast_enable(&port->ip4_query);
1904 #if IS_ENABLED(CONFIG_IPV6)
1905 else
1906 br_multicast_enable(&port->ip6_query);
1907 #endif
1908 }
1909 }
1910
1911 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1912 {
1913 int err = 0;
1914 struct net_bridge_mdb_htable *mdb;
1915
1916 spin_lock_bh(&br->multicast_lock);
1917 if (br->multicast_disabled == !val)
1918 goto unlock;
1919
1920 br->multicast_disabled = !val;
1921 if (br->multicast_disabled)
1922 goto unlock;
1923
1924 if (!netif_running(br->dev))
1925 goto unlock;
1926
1927 mdb = mlock_dereference(br->mdb, br);
1928 if (mdb) {
1929 if (mdb->old) {
1930 err = -EEXIST;
1931 rollback:
1932 br->multicast_disabled = !!val;
1933 goto unlock;
1934 }
1935
1936 err = br_mdb_rehash(&br->mdb, mdb->max,
1937 br->hash_elasticity);
1938 if (err)
1939 goto rollback;
1940 }
1941
1942 br_multicast_start_querier(br, &br->ip4_query);
1943 #if IS_ENABLED(CONFIG_IPV6)
1944 br_multicast_start_querier(br, &br->ip6_query);
1945 #endif
1946
1947 unlock:
1948 spin_unlock_bh(&br->multicast_lock);
1949
1950 return err;
1951 }
1952
1953 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1954 {
1955 unsigned long max_delay;
1956
1957 val = !!val;
1958
1959 spin_lock_bh(&br->multicast_lock);
1960 if (br->multicast_querier == val)
1961 goto unlock;
1962
1963 br->multicast_querier = val;
1964 if (!val)
1965 goto unlock;
1966
1967 max_delay = br->multicast_query_response_interval;
1968
1969 if (!timer_pending(&br->ip4_querier.timer))
1970 br->ip4_querier.delay_time = jiffies + max_delay;
1971
1972 br_multicast_start_querier(br, &br->ip4_query);
1973
1974 #if IS_ENABLED(CONFIG_IPV6)
1975 if (!timer_pending(&br->ip6_querier.timer))
1976 br->ip6_querier.delay_time = jiffies + max_delay;
1977
1978 br_multicast_start_querier(br, &br->ip6_query);
1979 #endif
1980
1981 unlock:
1982 spin_unlock_bh(&br->multicast_lock);
1983
1984 return 0;
1985 }
1986
1987 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1988 {
1989 int err = -ENOENT;
1990 u32 old;
1991 struct net_bridge_mdb_htable *mdb;
1992
1993 spin_lock(&br->multicast_lock);
1994 if (!netif_running(br->dev))
1995 goto unlock;
1996
1997 err = -EINVAL;
1998 if (!is_power_of_2(val))
1999 goto unlock;
2000
2001 mdb = mlock_dereference(br->mdb, br);
2002 if (mdb && val < mdb->size)
2003 goto unlock;
2004
2005 err = 0;
2006
2007 old = br->hash_max;
2008 br->hash_max = val;
2009
2010 if (mdb) {
2011 if (mdb->old) {
2012 err = -EEXIST;
2013 rollback:
2014 br->hash_max = old;
2015 goto unlock;
2016 }
2017
2018 err = br_mdb_rehash(&br->mdb, br->hash_max,
2019 br->hash_elasticity);
2020 if (err)
2021 goto rollback;
2022 }
2023
2024 unlock:
2025 spin_unlock(&br->multicast_lock);
2026
2027 return err;
2028 }
Linux kernel - Deliverables
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