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tracing: Use helper functions in event assignment to shrink macro size
[linux/fpc-iii.git] / net / bridge / br_multicast.c
blobef66365b7354da9f2fe2c4d87d2056d9a781f3c8
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 &&
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 setup_timer(&mp->timer, br_multicast_group_expired,
624 (unsigned long)mp);
625
626 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
627 mdb->size++;
628
629 out:
630 return mp;
631 }
632
633 struct net_bridge_port_group *br_multicast_new_port_group(
634 struct net_bridge_port *port,
635 struct br_ip *group,
636 struct net_bridge_port_group __rcu *next,
637 unsigned char state)
638 {
639 struct net_bridge_port_group *p;
640
641 p = kzalloc(sizeof(*p), GFP_ATOMIC);
642 if (unlikely(!p))
643 return NULL;
644
645 p->addr = *group;
646 p->port = port;
647 p->state = state;
648 rcu_assign_pointer(p->next, next);
649 hlist_add_head(&p->mglist, &port->mglist);
650 setup_timer(&p->timer, br_multicast_port_group_expired,
651 (unsigned long)p);
652 return p;
653 }
654
655 static int br_multicast_add_group(struct net_bridge *br,
656 struct net_bridge_port *port,
657 struct br_ip *group)
658 {
659 struct net_bridge_mdb_entry *mp;
660 struct net_bridge_port_group *p;
661 struct net_bridge_port_group __rcu **pp;
662 unsigned long now = jiffies;
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 mod_timer(&mp->timer, now + br->multicast_membership_interval);
678 goto out;
679 }
680
681 for (pp = &mp->ports;
682 (p = mlock_dereference(*pp, br)) != NULL;
683 pp = &p->next) {
684 if (p->port == port)
685 goto found;
686 if ((unsigned long)p->port < (unsigned long)port)
687 break;
688 }
689
690 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
691 if (unlikely(!p))
692 goto err;
693 rcu_assign_pointer(*pp, p);
694 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
695
696 found:
697 mod_timer(&p->timer, now + br->multicast_membership_interval);
698 out:
699 err = 0;
700
701 err:
702 spin_unlock(&br->multicast_lock);
703 return err;
704 }
705
706 static int br_ip4_multicast_add_group(struct net_bridge *br,
707 struct net_bridge_port *port,
708 __be32 group,
709 __u16 vid)
710 {
711 struct br_ip br_group;
712
713 if (ipv4_is_local_multicast(group))
714 return 0;
715
716 br_group.u.ip4 = group;
717 br_group.proto = htons(ETH_P_IP);
718 br_group.vid = vid;
719
720 return br_multicast_add_group(br, port, &br_group);
721 }
722
723 #if IS_ENABLED(CONFIG_IPV6)
724 static int br_ip6_multicast_add_group(struct net_bridge *br,
725 struct net_bridge_port *port,
726 const struct in6_addr *group,
727 __u16 vid)
728 {
729 struct br_ip br_group;
730
731 if (ipv6_addr_is_ll_all_nodes(group))
732 return 0;
733
734 br_group.u.ip6 = *group;
735 br_group.proto = htons(ETH_P_IPV6);
736 br_group.vid = vid;
737
738 return br_multicast_add_group(br, port, &br_group);
739 }
740 #endif
741
742 static void br_multicast_router_expired(unsigned long data)
743 {
744 struct net_bridge_port *port = (void *)data;
745 struct net_bridge *br = port->br;
746
747 spin_lock(&br->multicast_lock);
748 if (port->multicast_router != 1 ||
749 timer_pending(&port->multicast_router_timer) ||
750 hlist_unhashed(&port->rlist))
751 goto out;
752
753 hlist_del_init_rcu(&port->rlist);
754
755 out:
756 spin_unlock(&br->multicast_lock);
757 }
758
759 static void br_multicast_local_router_expired(unsigned long data)
760 {
761 }
762
763 static void br_multicast_querier_expired(struct net_bridge *br,
764 struct bridge_mcast_query *query)
765 {
766 spin_lock(&br->multicast_lock);
767 if (!netif_running(br->dev) || br->multicast_disabled)
768 goto out;
769
770 br_multicast_start_querier(br, query);
771
772 out:
773 spin_unlock(&br->multicast_lock);
774 }
775
776 static void br_ip4_multicast_querier_expired(unsigned long data)
777 {
778 struct net_bridge *br = (void *)data;
779
780 br_multicast_querier_expired(br, &br->ip4_query);
781 }
782
783 #if IS_ENABLED(CONFIG_IPV6)
784 static void br_ip6_multicast_querier_expired(unsigned long data)
785 {
786 struct net_bridge *br = (void *)data;
787
788 br_multicast_querier_expired(br, &br->ip6_query);
789 }
790 #endif
791
792 static void __br_multicast_send_query(struct net_bridge *br,
793 struct net_bridge_port *port,
794 struct br_ip *ip)
795 {
796 struct sk_buff *skb;
797
798 skb = br_multicast_alloc_query(br, ip);
799 if (!skb)
800 return;
801
802 if (port) {
803 __skb_push(skb, sizeof(struct ethhdr));
804 skb->dev = port->dev;
805 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
806 dev_queue_xmit);
807 } else
808 netif_rx(skb);
809 }
810
811 static void br_multicast_send_query(struct net_bridge *br,
812 struct net_bridge_port *port,
813 struct bridge_mcast_query *query)
814 {
815 unsigned long time;
816 struct br_ip br_group;
817 struct bridge_mcast_querier *querier = NULL;
818
819 if (!netif_running(br->dev) || br->multicast_disabled ||
820 !br->multicast_querier)
821 return;
822
823 memset(&br_group.u, 0, sizeof(br_group.u));
824
825 if (port ? (query == &port->ip4_query) :
826 (query == &br->ip4_query)) {
827 querier = &br->ip4_querier;
828 br_group.proto = htons(ETH_P_IP);
829 #if IS_ENABLED(CONFIG_IPV6)
830 } else {
831 querier = &br->ip6_querier;
832 br_group.proto = htons(ETH_P_IPV6);
833 #endif
834 }
835
836 if (!querier || timer_pending(&querier->timer))
837 return;
838
839 __br_multicast_send_query(br, port, &br_group);
840
841 time = jiffies;
842 time += query->startup_sent < br->multicast_startup_query_count ?
843 br->multicast_startup_query_interval :
844 br->multicast_query_interval;
845 mod_timer(&query->timer, time);
846 }
847
848 static void br_multicast_port_query_expired(struct net_bridge_port *port,
849 struct bridge_mcast_query *query)
850 {
851 struct net_bridge *br = port->br;
852
853 spin_lock(&br->multicast_lock);
854 if (port->state == BR_STATE_DISABLED ||
855 port->state == BR_STATE_BLOCKING)
856 goto out;
857
858 if (query->startup_sent < br->multicast_startup_query_count)
859 query->startup_sent++;
860
861 br_multicast_send_query(port->br, port, query);
862
863 out:
864 spin_unlock(&br->multicast_lock);
865 }
866
867 static void br_ip4_multicast_port_query_expired(unsigned long data)
868 {
869 struct net_bridge_port *port = (void *)data;
870
871 br_multicast_port_query_expired(port, &port->ip4_query);
872 }
873
874 #if IS_ENABLED(CONFIG_IPV6)
875 static void br_ip6_multicast_port_query_expired(unsigned long data)
876 {
877 struct net_bridge_port *port = (void *)data;
878
879 br_multicast_port_query_expired(port, &port->ip6_query);
880 }
881 #endif
882
883 void br_multicast_add_port(struct net_bridge_port *port)
884 {
885 port->multicast_router = 1;
886
887 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
888 (unsigned long)port);
889 setup_timer(&port->ip4_query.timer, br_ip4_multicast_port_query_expired,
890 (unsigned long)port);
891 #if IS_ENABLED(CONFIG_IPV6)
892 setup_timer(&port->ip6_query.timer, br_ip6_multicast_port_query_expired,
893 (unsigned long)port);
894 #endif
895 }
896
897 void br_multicast_del_port(struct net_bridge_port *port)
898 {
899 del_timer_sync(&port->multicast_router_timer);
900 }
901
902 static void br_multicast_enable(struct bridge_mcast_query *query)
903 {
904 query->startup_sent = 0;
905
906 if (try_to_del_timer_sync(&query->timer) >= 0 ||
907 del_timer(&query->timer))
908 mod_timer(&query->timer, jiffies);
909 }
910
911 void br_multicast_enable_port(struct net_bridge_port *port)
912 {
913 struct net_bridge *br = port->br;
914
915 spin_lock(&br->multicast_lock);
916 if (br->multicast_disabled || !netif_running(br->dev))
917 goto out;
918
919 br_multicast_enable(&port->ip4_query);
920 #if IS_ENABLED(CONFIG_IPV6)
921 br_multicast_enable(&port->ip6_query);
922 #endif
923
924 out:
925 spin_unlock(&br->multicast_lock);
926 }
927
928 void br_multicast_disable_port(struct net_bridge_port *port)
929 {
930 struct net_bridge *br = port->br;
931 struct net_bridge_port_group *pg;
932 struct hlist_node *n;
933
934 spin_lock(&br->multicast_lock);
935 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
936 br_multicast_del_pg(br, pg);
937
938 if (!hlist_unhashed(&port->rlist))
939 hlist_del_init_rcu(&port->rlist);
940 del_timer(&port->multicast_router_timer);
941 del_timer(&port->ip4_query.timer);
942 #if IS_ENABLED(CONFIG_IPV6)
943 del_timer(&port->ip6_query.timer);
944 #endif
945 spin_unlock(&br->multicast_lock);
946 }
947
948 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
949 struct net_bridge_port *port,
950 struct sk_buff *skb,
951 u16 vid)
952 {
953 struct igmpv3_report *ih;
954 struct igmpv3_grec *grec;
955 int i;
956 int len;
957 int num;
958 int type;
959 int err = 0;
960 __be32 group;
961
962 if (!pskb_may_pull(skb, sizeof(*ih)))
963 return -EINVAL;
964
965 ih = igmpv3_report_hdr(skb);
966 num = ntohs(ih->ngrec);
967 len = sizeof(*ih);
968
969 for (i = 0; i < num; i++) {
970 len += sizeof(*grec);
971 if (!pskb_may_pull(skb, len))
972 return -EINVAL;
973
974 grec = (void *)(skb->data + len - sizeof(*grec));
975 group = grec->grec_mca;
976 type = grec->grec_type;
977
978 len += ntohs(grec->grec_nsrcs) * 4;
979 if (!pskb_may_pull(skb, len))
980 return -EINVAL;
981
982 /* We treat this as an IGMPv2 report for now. */
983 switch (type) {
984 case IGMPV3_MODE_IS_INCLUDE:
985 case IGMPV3_MODE_IS_EXCLUDE:
986 case IGMPV3_CHANGE_TO_INCLUDE:
987 case IGMPV3_CHANGE_TO_EXCLUDE:
988 case IGMPV3_ALLOW_NEW_SOURCES:
989 case IGMPV3_BLOCK_OLD_SOURCES:
990 break;
991
992 default:
993 continue;
994 }
995
996 err = br_ip4_multicast_add_group(br, port, group, vid);
997 if (err)
998 break;
999 }
1000
1001 return err;
1002 }
1003
1004 #if IS_ENABLED(CONFIG_IPV6)
1005 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1006 struct net_bridge_port *port,
1007 struct sk_buff *skb,
1008 u16 vid)
1009 {
1010 struct icmp6hdr *icmp6h;
1011 struct mld2_grec *grec;
1012 int i;
1013 int len;
1014 int num;
1015 int err = 0;
1016
1017 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1018 return -EINVAL;
1019
1020 icmp6h = icmp6_hdr(skb);
1021 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1022 len = sizeof(*icmp6h);
1023
1024 for (i = 0; i < num; i++) {
1025 __be16 *nsrcs, _nsrcs;
1026
1027 nsrcs = skb_header_pointer(skb,
1028 len + offsetof(struct mld2_grec,
1029 grec_nsrcs),
1030 sizeof(_nsrcs), &_nsrcs);
1031 if (!nsrcs)
1032 return -EINVAL;
1033
1034 if (!pskb_may_pull(skb,
1035 len + sizeof(*grec) +
1036 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1037 return -EINVAL;
1038
1039 grec = (struct mld2_grec *)(skb->data + len);
1040 len += sizeof(*grec) +
1041 sizeof(struct in6_addr) * ntohs(*nsrcs);
1042
1043 /* We treat these as MLDv1 reports for now. */
1044 switch (grec->grec_type) {
1045 case MLD2_MODE_IS_INCLUDE:
1046 case MLD2_MODE_IS_EXCLUDE:
1047 case MLD2_CHANGE_TO_INCLUDE:
1048 case MLD2_CHANGE_TO_EXCLUDE:
1049 case MLD2_ALLOW_NEW_SOURCES:
1050 case MLD2_BLOCK_OLD_SOURCES:
1051 break;
1052
1053 default:
1054 continue;
1055 }
1056
1057 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1058 vid);
1059 if (!err)
1060 break;
1061 }
1062
1063 return err;
1064 }
1065 #endif
1066
1067 static void
1068 br_multicast_update_querier_timer(struct net_bridge *br,
1069 struct bridge_mcast_querier *querier,
1070 unsigned long max_delay)
1071 {
1072 if (!timer_pending(&querier->timer))
1073 querier->delay_time = jiffies + max_delay;
1074
1075 mod_timer(&querier->timer, jiffies + br->multicast_querier_interval);
1076 }
1077
1078 /*
1079 * Add port to router_list
1080 * list is maintained ordered by pointer value
1081 * and locked by br->multicast_lock and RCU
1082 */
1083 static void br_multicast_add_router(struct net_bridge *br,
1084 struct net_bridge_port *port)
1085 {
1086 struct net_bridge_port *p;
1087 struct hlist_node *slot = NULL;
1088
1089 hlist_for_each_entry(p, &br->router_list, rlist) {
1090 if ((unsigned long) port >= (unsigned long) p)
1091 break;
1092 slot = &p->rlist;
1093 }
1094
1095 if (slot)
1096 hlist_add_after_rcu(slot, &port->rlist);
1097 else
1098 hlist_add_head_rcu(&port->rlist, &br->router_list);
1099 }
1100
1101 static void br_multicast_mark_router(struct net_bridge *br,
1102 struct net_bridge_port *port)
1103 {
1104 unsigned long now = jiffies;
1105
1106 if (!port) {
1107 if (br->multicast_router == 1)
1108 mod_timer(&br->multicast_router_timer,
1109 now + br->multicast_querier_interval);
1110 return;
1111 }
1112
1113 if (port->multicast_router != 1)
1114 return;
1115
1116 if (!hlist_unhashed(&port->rlist))
1117 goto timer;
1118
1119 br_multicast_add_router(br, port);
1120
1121 timer:
1122 mod_timer(&port->multicast_router_timer,
1123 now + br->multicast_querier_interval);
1124 }
1125
1126 static void br_multicast_query_received(struct net_bridge *br,
1127 struct net_bridge_port *port,
1128 struct bridge_mcast_querier *querier,
1129 int saddr,
1130 unsigned long max_delay)
1131 {
1132 if (saddr)
1133 br_multicast_update_querier_timer(br, querier, max_delay);
1134 else if (timer_pending(&querier->timer))
1135 return;
1136
1137 br_multicast_mark_router(br, port);
1138 }
1139
1140 static int br_ip4_multicast_query(struct net_bridge *br,
1141 struct net_bridge_port *port,
1142 struct sk_buff *skb,
1143 u16 vid)
1144 {
1145 const struct iphdr *iph = ip_hdr(skb);
1146 struct igmphdr *ih = igmp_hdr(skb);
1147 struct net_bridge_mdb_entry *mp;
1148 struct igmpv3_query *ih3;
1149 struct net_bridge_port_group *p;
1150 struct net_bridge_port_group __rcu **pp;
1151 unsigned long max_delay;
1152 unsigned long now = jiffies;
1153 __be32 group;
1154 int err = 0;
1155
1156 spin_lock(&br->multicast_lock);
1157 if (!netif_running(br->dev) ||
1158 (port && port->state == BR_STATE_DISABLED))
1159 goto out;
1160
1161 group = ih->group;
1162
1163 if (skb->len == sizeof(*ih)) {
1164 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1165
1166 if (!max_delay) {
1167 max_delay = 10 * HZ;
1168 group = 0;
1169 }
1170 } else {
1171 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1172 err = -EINVAL;
1173 goto out;
1174 }
1175
1176 ih3 = igmpv3_query_hdr(skb);
1177 if (ih3->nsrcs)
1178 goto out;
1179
1180 max_delay = ih3->code ?
1181 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1182 }
1183
1184 br_multicast_query_received(br, port, &br->ip4_querier, !!iph->saddr,
1185 max_delay);
1186
1187 if (!group)
1188 goto out;
1189
1190 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1191 if (!mp)
1192 goto out;
1193
1194 max_delay *= br->multicast_last_member_count;
1195
1196 if (mp->mglist &&
1197 (timer_pending(&mp->timer) ?
1198 time_after(mp->timer.expires, now + max_delay) :
1199 try_to_del_timer_sync(&mp->timer) >= 0))
1200 mod_timer(&mp->timer, now + max_delay);
1201
1202 for (pp = &mp->ports;
1203 (p = mlock_dereference(*pp, br)) != NULL;
1204 pp = &p->next) {
1205 if (timer_pending(&p->timer) ?
1206 time_after(p->timer.expires, now + max_delay) :
1207 try_to_del_timer_sync(&p->timer) >= 0)
1208 mod_timer(&p->timer, now + max_delay);
1209 }
1210
1211 out:
1212 spin_unlock(&br->multicast_lock);
1213 return err;
1214 }
1215
1216 #if IS_ENABLED(CONFIG_IPV6)
1217 static int br_ip6_multicast_query(struct net_bridge *br,
1218 struct net_bridge_port *port,
1219 struct sk_buff *skb,
1220 u16 vid)
1221 {
1222 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1223 struct mld_msg *mld;
1224 struct net_bridge_mdb_entry *mp;
1225 struct mld2_query *mld2q;
1226 struct net_bridge_port_group *p;
1227 struct net_bridge_port_group __rcu **pp;
1228 unsigned long max_delay;
1229 unsigned long now = jiffies;
1230 const struct in6_addr *group = NULL;
1231 int err = 0;
1232
1233 spin_lock(&br->multicast_lock);
1234 if (!netif_running(br->dev) ||
1235 (port && port->state == BR_STATE_DISABLED))
1236 goto out;
1237
1238 if (skb->len == sizeof(*mld)) {
1239 if (!pskb_may_pull(skb, sizeof(*mld))) {
1240 err = -EINVAL;
1241 goto out;
1242 }
1243 mld = (struct mld_msg *) icmp6_hdr(skb);
1244 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1245 if (max_delay)
1246 group = &mld->mld_mca;
1247 } else {
1248 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1249 err = -EINVAL;
1250 goto out;
1251 }
1252 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1253 if (!mld2q->mld2q_nsrcs)
1254 group = &mld2q->mld2q_mca;
1255
1256 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1257 }
1258
1259 br_multicast_query_received(br, port, &br->ip6_querier,
1260 !ipv6_addr_any(&ip6h->saddr), max_delay);
1261
1262 if (!group)
1263 goto out;
1264
1265 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1266 if (!mp)
1267 goto out;
1268
1269 max_delay *= br->multicast_last_member_count;
1270 if (mp->mglist &&
1271 (timer_pending(&mp->timer) ?
1272 time_after(mp->timer.expires, now + max_delay) :
1273 try_to_del_timer_sync(&mp->timer) >= 0))
1274 mod_timer(&mp->timer, now + max_delay);
1275
1276 for (pp = &mp->ports;
1277 (p = mlock_dereference(*pp, br)) != NULL;
1278 pp = &p->next) {
1279 if (timer_pending(&p->timer) ?
1280 time_after(p->timer.expires, now + max_delay) :
1281 try_to_del_timer_sync(&p->timer) >= 0)
1282 mod_timer(&p->timer, now + max_delay);
1283 }
1284
1285 out:
1286 spin_unlock(&br->multicast_lock);
1287 return err;
1288 }
1289 #endif
1290
1291 static void br_multicast_leave_group(struct net_bridge *br,
1292 struct net_bridge_port *port,
1293 struct br_ip *group,
1294 struct bridge_mcast_querier *querier,
1295 struct bridge_mcast_query *query)
1296 {
1297 struct net_bridge_mdb_htable *mdb;
1298 struct net_bridge_mdb_entry *mp;
1299 struct net_bridge_port_group *p;
1300 unsigned long now;
1301 unsigned long time;
1302
1303 spin_lock(&br->multicast_lock);
1304 if (!netif_running(br->dev) ||
1305 (port && port->state == BR_STATE_DISABLED) ||
1306 timer_pending(&querier->timer))
1307 goto out;
1308
1309 mdb = mlock_dereference(br->mdb, br);
1310 mp = br_mdb_ip_get(mdb, group);
1311 if (!mp)
1312 goto out;
1313
1314 if (br->multicast_querier) {
1315 __br_multicast_send_query(br, port, &mp->addr);
1316
1317 time = jiffies + br->multicast_last_member_count *
1318 br->multicast_last_member_interval;
1319
1320 mod_timer(&query->timer, time);
1321
1322 for (p = mlock_dereference(mp->ports, br);
1323 p != NULL;
1324 p = mlock_dereference(p->next, br)) {
1325 if (p->port != port)
1326 continue;
1327
1328 if (!hlist_unhashed(&p->mglist) &&
1329 (timer_pending(&p->timer) ?
1330 time_after(p->timer.expires, time) :
1331 try_to_del_timer_sync(&p->timer) >= 0)) {
1332 mod_timer(&p->timer, time);
1333 }
1334
1335 break;
1336 }
1337 }
1338
1339 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1340 struct net_bridge_port_group __rcu **pp;
1341
1342 for (pp = &mp->ports;
1343 (p = mlock_dereference(*pp, br)) != NULL;
1344 pp = &p->next) {
1345 if (p->port != port)
1346 continue;
1347
1348 rcu_assign_pointer(*pp, p->next);
1349 hlist_del_init(&p->mglist);
1350 del_timer(&p->timer);
1351 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1352 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1353
1354 if (!mp->ports && !mp->mglist &&
1355 netif_running(br->dev))
1356 mod_timer(&mp->timer, jiffies);
1357 }
1358 goto out;
1359 }
1360
1361 now = jiffies;
1362 time = now + br->multicast_last_member_count *
1363 br->multicast_last_member_interval;
1364
1365 if (!port) {
1366 if (mp->mglist &&
1367 (timer_pending(&mp->timer) ?
1368 time_after(mp->timer.expires, time) :
1369 try_to_del_timer_sync(&mp->timer) >= 0)) {
1370 mod_timer(&mp->timer, time);
1371 }
1372
1373 goto out;
1374 }
1375
1376 for (p = mlock_dereference(mp->ports, br);
1377 p != NULL;
1378 p = mlock_dereference(p->next, br)) {
1379 if (p->port != port)
1380 continue;
1381
1382 if (!hlist_unhashed(&p->mglist) &&
1383 (timer_pending(&p->timer) ?
1384 time_after(p->timer.expires, time) :
1385 try_to_del_timer_sync(&p->timer) >= 0)) {
1386 mod_timer(&p->timer, time);
1387 }
1388
1389 break;
1390 }
1391 out:
1392 spin_unlock(&br->multicast_lock);
1393 }
1394
1395 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1396 struct net_bridge_port *port,
1397 __be32 group,
1398 __u16 vid)
1399 {
1400 struct br_ip br_group;
1401 struct bridge_mcast_query *query = port ? &port->ip4_query :
1402 &br->ip4_query;
1403
1404 if (ipv4_is_local_multicast(group))
1405 return;
1406
1407 br_group.u.ip4 = group;
1408 br_group.proto = htons(ETH_P_IP);
1409 br_group.vid = vid;
1410
1411 br_multicast_leave_group(br, port, &br_group, &br->ip4_querier, query);
1412 }
1413
1414 #if IS_ENABLED(CONFIG_IPV6)
1415 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1416 struct net_bridge_port *port,
1417 const struct in6_addr *group,
1418 __u16 vid)
1419 {
1420 struct br_ip br_group;
1421 struct bridge_mcast_query *query = port ? &port->ip6_query :
1422 &br->ip6_query;
1423
1424
1425 if (ipv6_addr_is_ll_all_nodes(group))
1426 return;
1427
1428 br_group.u.ip6 = *group;
1429 br_group.proto = htons(ETH_P_IPV6);
1430 br_group.vid = vid;
1431
1432 br_multicast_leave_group(br, port, &br_group, &br->ip6_querier, query);
1433 }
1434 #endif
1435
1436 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1437 struct net_bridge_port *port,
1438 struct sk_buff *skb,
1439 u16 vid)
1440 {
1441 struct sk_buff *skb2 = skb;
1442 const struct iphdr *iph;
1443 struct igmphdr *ih;
1444 unsigned int len;
1445 unsigned int offset;
1446 int err;
1447
1448 /* We treat OOM as packet loss for now. */
1449 if (!pskb_may_pull(skb, sizeof(*iph)))
1450 return -EINVAL;
1451
1452 iph = ip_hdr(skb);
1453
1454 if (iph->ihl < 5 || iph->version != 4)
1455 return -EINVAL;
1456
1457 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1458 return -EINVAL;
1459
1460 iph = ip_hdr(skb);
1461
1462 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1463 return -EINVAL;
1464
1465 if (iph->protocol != IPPROTO_IGMP) {
1466 if (!ipv4_is_local_multicast(iph->daddr))
1467 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1468 return 0;
1469 }
1470
1471 len = ntohs(iph->tot_len);
1472 if (skb->len < len || len < ip_hdrlen(skb))
1473 return -EINVAL;
1474
1475 if (skb->len > len) {
1476 skb2 = skb_clone(skb, GFP_ATOMIC);
1477 if (!skb2)
1478 return -ENOMEM;
1479
1480 err = pskb_trim_rcsum(skb2, len);
1481 if (err)
1482 goto err_out;
1483 }
1484
1485 len -= ip_hdrlen(skb2);
1486 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1487 __skb_pull(skb2, offset);
1488 skb_reset_transport_header(skb2);
1489
1490 err = -EINVAL;
1491 if (!pskb_may_pull(skb2, sizeof(*ih)))
1492 goto out;
1493
1494 switch (skb2->ip_summed) {
1495 case CHECKSUM_COMPLETE:
1496 if (!csum_fold(skb2->csum))
1497 break;
1498 /* fall through */
1499 case CHECKSUM_NONE:
1500 skb2->csum = 0;
1501 if (skb_checksum_complete(skb2))
1502 goto out;
1503 }
1504
1505 err = 0;
1506
1507 BR_INPUT_SKB_CB(skb)->igmp = 1;
1508 ih = igmp_hdr(skb2);
1509
1510 switch (ih->type) {
1511 case IGMP_HOST_MEMBERSHIP_REPORT:
1512 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1513 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1514 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1515 break;
1516 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1517 err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
1518 break;
1519 case IGMP_HOST_MEMBERSHIP_QUERY:
1520 err = br_ip4_multicast_query(br, port, skb2, vid);
1521 break;
1522 case IGMP_HOST_LEAVE_MESSAGE:
1523 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1524 break;
1525 }
1526
1527 out:
1528 __skb_push(skb2, offset);
1529 err_out:
1530 if (skb2 != skb)
1531 kfree_skb(skb2);
1532 return err;
1533 }
1534
1535 #if IS_ENABLED(CONFIG_IPV6)
1536 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1537 struct net_bridge_port *port,
1538 struct sk_buff *skb,
1539 u16 vid)
1540 {
1541 struct sk_buff *skb2;
1542 const struct ipv6hdr *ip6h;
1543 u8 icmp6_type;
1544 u8 nexthdr;
1545 __be16 frag_off;
1546 unsigned int len;
1547 int offset;
1548 int err;
1549
1550 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1551 return -EINVAL;
1552
1553 ip6h = ipv6_hdr(skb);
1554
1555 /*
1556 * We're interested in MLD messages only.
1557 * - Version is 6
1558 * - MLD has always Router Alert hop-by-hop option
1559 * - But we do not support jumbrograms.
1560 */
1561 if (ip6h->version != 6)
1562 return 0;
1563
1564 /* Prevent flooding this packet if there is no listener present */
1565 if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
1566 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1567
1568 if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
1569 ip6h->payload_len == 0)
1570 return 0;
1571
1572 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1573 if (skb->len < len)
1574 return -EINVAL;
1575
1576 nexthdr = ip6h->nexthdr;
1577 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1578
1579 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1580 return 0;
1581
1582 /* Okay, we found ICMPv6 header */
1583 skb2 = skb_clone(skb, GFP_ATOMIC);
1584 if (!skb2)
1585 return -ENOMEM;
1586
1587 err = -EINVAL;
1588 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1589 goto out;
1590
1591 len -= offset - skb_network_offset(skb2);
1592
1593 __skb_pull(skb2, offset);
1594 skb_reset_transport_header(skb2);
1595 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1596 skb_network_header_len(skb2));
1597
1598 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1599
1600 switch (icmp6_type) {
1601 case ICMPV6_MGM_QUERY:
1602 case ICMPV6_MGM_REPORT:
1603 case ICMPV6_MGM_REDUCTION:
1604 case ICMPV6_MLD2_REPORT:
1605 break;
1606 default:
1607 err = 0;
1608 goto out;
1609 }
1610
1611 /* Okay, we found MLD message. Check further. */
1612 if (skb2->len > len) {
1613 err = pskb_trim_rcsum(skb2, len);
1614 if (err)
1615 goto out;
1616 err = -EINVAL;
1617 }
1618
1619 ip6h = ipv6_hdr(skb2);
1620
1621 switch (skb2->ip_summed) {
1622 case CHECKSUM_COMPLETE:
1623 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1624 IPPROTO_ICMPV6, skb2->csum))
1625 break;
1626 /*FALLTHROUGH*/
1627 case CHECKSUM_NONE:
1628 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1629 &ip6h->daddr,
1630 skb2->len,
1631 IPPROTO_ICMPV6, 0));
1632 if (__skb_checksum_complete(skb2))
1633 goto out;
1634 }
1635
1636 err = 0;
1637
1638 BR_INPUT_SKB_CB(skb)->igmp = 1;
1639
1640 switch (icmp6_type) {
1641 case ICMPV6_MGM_REPORT:
1642 {
1643 struct mld_msg *mld;
1644 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1645 err = -EINVAL;
1646 goto out;
1647 }
1648 mld = (struct mld_msg *)skb_transport_header(skb2);
1649 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1650 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1651 break;
1652 }
1653 case ICMPV6_MLD2_REPORT:
1654 err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
1655 break;
1656 case ICMPV6_MGM_QUERY:
1657 err = br_ip6_multicast_query(br, port, skb2, vid);
1658 break;
1659 case ICMPV6_MGM_REDUCTION:
1660 {
1661 struct mld_msg *mld;
1662 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1663 err = -EINVAL;
1664 goto out;
1665 }
1666 mld = (struct mld_msg *)skb_transport_header(skb2);
1667 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1668 }
1669 }
1670
1671 out:
1672 kfree_skb(skb2);
1673 return err;
1674 }
1675 #endif
1676
1677 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1678 struct sk_buff *skb, u16 vid)
1679 {
1680 BR_INPUT_SKB_CB(skb)->igmp = 0;
1681 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1682
1683 if (br->multicast_disabled)
1684 return 0;
1685
1686 switch (skb->protocol) {
1687 case htons(ETH_P_IP):
1688 return br_multicast_ipv4_rcv(br, port, skb, vid);
1689 #if IS_ENABLED(CONFIG_IPV6)
1690 case htons(ETH_P_IPV6):
1691 return br_multicast_ipv6_rcv(br, port, skb, vid);
1692 #endif
1693 }
1694
1695 return 0;
1696 }
1697
1698 static void br_multicast_query_expired(struct net_bridge *br,
1699 struct bridge_mcast_query *query)
1700 {
1701 spin_lock(&br->multicast_lock);
1702 if (query->startup_sent < br->multicast_startup_query_count)
1703 query->startup_sent++;
1704
1705 br_multicast_send_query(br, NULL, query);
1706 spin_unlock(&br->multicast_lock);
1707 }
1708
1709 static void br_ip4_multicast_query_expired(unsigned long data)
1710 {
1711 struct net_bridge *br = (void *)data;
1712
1713 br_multicast_query_expired(br, &br->ip4_query);
1714 }
1715
1716 #if IS_ENABLED(CONFIG_IPV6)
1717 static void br_ip6_multicast_query_expired(unsigned long data)
1718 {
1719 struct net_bridge *br = (void *)data;
1720
1721 br_multicast_query_expired(br, &br->ip6_query);
1722 }
1723 #endif
1724
1725 void br_multicast_init(struct net_bridge *br)
1726 {
1727 br->hash_elasticity = 4;
1728 br->hash_max = 512;
1729
1730 br->multicast_router = 1;
1731 br->multicast_querier = 0;
1732 br->multicast_query_use_ifaddr = 0;
1733 br->multicast_last_member_count = 2;
1734 br->multicast_startup_query_count = 2;
1735
1736 br->multicast_last_member_interval = HZ;
1737 br->multicast_query_response_interval = 10 * HZ;
1738 br->multicast_startup_query_interval = 125 * HZ / 4;
1739 br->multicast_query_interval = 125 * HZ;
1740 br->multicast_querier_interval = 255 * HZ;
1741 br->multicast_membership_interval = 260 * HZ;
1742
1743 br->ip4_querier.delay_time = 0;
1744 #if IS_ENABLED(CONFIG_IPV6)
1745 br->ip6_querier.delay_time = 0;
1746 #endif
1747
1748 spin_lock_init(&br->multicast_lock);
1749 setup_timer(&br->multicast_router_timer,
1750 br_multicast_local_router_expired, 0);
1751 setup_timer(&br->ip4_querier.timer, br_ip4_multicast_querier_expired,
1752 (unsigned long)br);
1753 setup_timer(&br->ip4_query.timer, br_ip4_multicast_query_expired,
1754 (unsigned long)br);
1755 #if IS_ENABLED(CONFIG_IPV6)
1756 setup_timer(&br->ip6_querier.timer, br_ip6_multicast_querier_expired,
1757 (unsigned long)br);
1758 setup_timer(&br->ip6_query.timer, br_ip6_multicast_query_expired,
1759 (unsigned long)br);
1760 #endif
1761 }
1762
1763 static void __br_multicast_open(struct net_bridge *br,
1764 struct bridge_mcast_query *query)
1765 {
1766 query->startup_sent = 0;
1767
1768 if (br->multicast_disabled)
1769 return;
1770
1771 mod_timer(&query->timer, jiffies);
1772 }
1773
1774 void br_multicast_open(struct net_bridge *br)
1775 {
1776 __br_multicast_open(br, &br->ip4_query);
1777 #if IS_ENABLED(CONFIG_IPV6)
1778 __br_multicast_open(br, &br->ip6_query);
1779 #endif
1780 }
1781
1782 void br_multicast_stop(struct net_bridge *br)
1783 {
1784 struct net_bridge_mdb_htable *mdb;
1785 struct net_bridge_mdb_entry *mp;
1786 struct hlist_node *n;
1787 u32 ver;
1788 int i;
1789
1790 del_timer_sync(&br->multicast_router_timer);
1791 del_timer_sync(&br->ip4_querier.timer);
1792 del_timer_sync(&br->ip4_query.timer);
1793 #if IS_ENABLED(CONFIG_IPV6)
1794 del_timer_sync(&br->ip6_querier.timer);
1795 del_timer_sync(&br->ip6_query.timer);
1796 #endif
1797
1798 spin_lock_bh(&br->multicast_lock);
1799 mdb = mlock_dereference(br->mdb, br);
1800 if (!mdb)
1801 goto out;
1802
1803 br->mdb = NULL;
1804
1805 ver = mdb->ver;
1806 for (i = 0; i < mdb->max; i++) {
1807 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1808 hlist[ver]) {
1809 del_timer(&mp->timer);
1810 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1811 }
1812 }
1813
1814 if (mdb->old) {
1815 spin_unlock_bh(&br->multicast_lock);
1816 rcu_barrier_bh();
1817 spin_lock_bh(&br->multicast_lock);
1818 WARN_ON(mdb->old);
1819 }
1820
1821 mdb->old = mdb;
1822 call_rcu_bh(&mdb->rcu, br_mdb_free);
1823
1824 out:
1825 spin_unlock_bh(&br->multicast_lock);
1826 }
1827
1828 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1829 {
1830 int err = -ENOENT;
1831
1832 spin_lock_bh(&br->multicast_lock);
1833 if (!netif_running(br->dev))
1834 goto unlock;
1835
1836 switch (val) {
1837 case 0:
1838 case 2:
1839 del_timer(&br->multicast_router_timer);
1840 /* fall through */
1841 case 1:
1842 br->multicast_router = val;
1843 err = 0;
1844 break;
1845
1846 default:
1847 err = -EINVAL;
1848 break;
1849 }
1850
1851 unlock:
1852 spin_unlock_bh(&br->multicast_lock);
1853
1854 return err;
1855 }
1856
1857 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1858 {
1859 struct net_bridge *br = p->br;
1860 int err = -ENOENT;
1861
1862 spin_lock(&br->multicast_lock);
1863 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1864 goto unlock;
1865
1866 switch (val) {
1867 case 0:
1868 case 1:
1869 case 2:
1870 p->multicast_router = val;
1871 err = 0;
1872
1873 if (val < 2 && !hlist_unhashed(&p->rlist))
1874 hlist_del_init_rcu(&p->rlist);
1875
1876 if (val == 1)
1877 break;
1878
1879 del_timer(&p->multicast_router_timer);
1880
1881 if (val == 0)
1882 break;
1883
1884 br_multicast_add_router(br, p);
1885 break;
1886
1887 default:
1888 err = -EINVAL;
1889 break;
1890 }
1891
1892 unlock:
1893 spin_unlock(&br->multicast_lock);
1894
1895 return err;
1896 }
1897
1898 static void br_multicast_start_querier(struct net_bridge *br,
1899 struct bridge_mcast_query *query)
1900 {
1901 struct net_bridge_port *port;
1902
1903 __br_multicast_open(br, query);
1904
1905 list_for_each_entry(port, &br->port_list, list) {
1906 if (port->state == BR_STATE_DISABLED ||
1907 port->state == BR_STATE_BLOCKING)
1908 continue;
1909
1910 if (query == &br->ip4_query)
1911 br_multicast_enable(&port->ip4_query);
1912 #if IS_ENABLED(CONFIG_IPV6)
1913 else
1914 br_multicast_enable(&port->ip6_query);
1915 #endif
1916 }
1917 }
1918
1919 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1920 {
1921 int err = 0;
1922 struct net_bridge_mdb_htable *mdb;
1923
1924 spin_lock_bh(&br->multicast_lock);
1925 if (br->multicast_disabled == !val)
1926 goto unlock;
1927
1928 br->multicast_disabled = !val;
1929 if (br->multicast_disabled)
1930 goto unlock;
1931
1932 if (!netif_running(br->dev))
1933 goto unlock;
1934
1935 mdb = mlock_dereference(br->mdb, br);
1936 if (mdb) {
1937 if (mdb->old) {
1938 err = -EEXIST;
1939 rollback:
1940 br->multicast_disabled = !!val;
1941 goto unlock;
1942 }
1943
1944 err = br_mdb_rehash(&br->mdb, mdb->max,
1945 br->hash_elasticity);
1946 if (err)
1947 goto rollback;
1948 }
1949
1950 br_multicast_start_querier(br, &br->ip4_query);
1951 #if IS_ENABLED(CONFIG_IPV6)
1952 br_multicast_start_querier(br, &br->ip6_query);
1953 #endif
1954
1955 unlock:
1956 spin_unlock_bh(&br->multicast_lock);
1957
1958 return err;
1959 }
1960
1961 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1962 {
1963 unsigned long max_delay;
1964
1965 val = !!val;
1966
1967 spin_lock_bh(&br->multicast_lock);
1968 if (br->multicast_querier == val)
1969 goto unlock;
1970
1971 br->multicast_querier = val;
1972 if (!val)
1973 goto unlock;
1974
1975 max_delay = br->multicast_query_response_interval;
1976
1977 if (!timer_pending(&br->ip4_querier.timer))
1978 br->ip4_querier.delay_time = jiffies + max_delay;
1979
1980 br_multicast_start_querier(br, &br->ip4_query);
1981
1982 #if IS_ENABLED(CONFIG_IPV6)
1983 if (!timer_pending(&br->ip6_querier.timer))
1984 br->ip6_querier.delay_time = jiffies + max_delay;
1985
1986 br_multicast_start_querier(br, &br->ip6_query);
1987 #endif
1988
1989 unlock:
1990 spin_unlock_bh(&br->multicast_lock);
1991
1992 return 0;
1993 }
1994
1995 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1996 {
1997 int err = -ENOENT;
1998 u32 old;
1999 struct net_bridge_mdb_htable *mdb;
2000
2001 spin_lock_bh(&br->multicast_lock);
2002 if (!netif_running(br->dev))
2003 goto unlock;
2004
2005 err = -EINVAL;
2006 if (!is_power_of_2(val))
2007 goto unlock;
2008
2009 mdb = mlock_dereference(br->mdb, br);
2010 if (mdb && val < mdb->size)
2011 goto unlock;
2012
2013 err = 0;
2014
2015 old = br->hash_max;
2016 br->hash_max = val;
2017
2018 if (mdb) {
2019 if (mdb->old) {
2020 err = -EEXIST;
2021 rollback:
2022 br->hash_max = old;
2023 goto unlock;
2024 }
2025
2026 err = br_mdb_rehash(&br->mdb, br->hash_max,
2027 br->hash_elasticity);
2028 if (err)
2029 goto rollback;
2030 }
2031
2032 unlock:
2033 spin_unlock_bh(&br->multicast_lock);
2034
2035 return err;
2036 }
Linux with added FPC-III support