projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
hlist: drop the node parameter from iterators
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bridge / br_multicast.c
1 /*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13 #include <linux/err.h>
14 #include <linux/if_ether.h>
15 #include <linux/igmp.h>
16 #include <linux/jhash.h>
17 #include <linux/kernel.h>
18 #include <linux/log2.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter_bridge.h>
21 #include <linux/random.h>
22 #include <linux/rculist.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
26 #include <net/ip.h>
27 #if IS_ENABLED(CONFIG_IPV6)
28 #include <net/ipv6.h>
29 #include <net/mld.h>
30 #include <net/ip6_checksum.h>
31 #endif
32
33 #include "br_private.h"
34
35 static void br_multicast_start_querier(struct net_bridge *br);
36 unsigned int br_mdb_rehash_seq;
37
38 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
39 {
40 if (a->proto != b->proto)
41 return 0;
42 if (a->vid != b->vid)
43 return 0;
44 switch (a->proto) {
45 case htons(ETH_P_IP):
46 return a->u.ip4 == b->u.ip4;
47 #if IS_ENABLED(CONFIG_IPV6)
48 case htons(ETH_P_IPV6):
49 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
50 #endif
51 }
52 return 0;
53 }
54
55 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
56 __u16 vid)
57 {
58 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
59 }
60
61 #if IS_ENABLED(CONFIG_IPV6)
62 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
63 const struct in6_addr *ip,
64 __u16 vid)
65 {
66 return jhash_2words(ipv6_addr_hash(ip), vid,
67 mdb->secret) & (mdb->max - 1);
68 }
69 #endif
70
71 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
72 struct br_ip *ip)
73 {
74 switch (ip->proto) {
75 case htons(ETH_P_IP):
76 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
77 #if IS_ENABLED(CONFIG_IPV6)
78 case htons(ETH_P_IPV6):
79 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
80 #endif
81 }
82 return 0;
83 }
84
85 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
86 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
87 {
88 struct net_bridge_mdb_entry *mp;
89
90 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
91 if (br_ip_equal(&mp->addr, dst))
92 return mp;
93 }
94
95 return NULL;
96 }
97
98 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
99 struct br_ip *dst)
100 {
101 if (!mdb)
102 return NULL;
103
104 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
105 }
106
107 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
108 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
109 {
110 struct br_ip br_dst;
111
112 br_dst.u.ip4 = dst;
113 br_dst.proto = htons(ETH_P_IP);
114 br_dst.vid = vid;
115
116 return br_mdb_ip_get(mdb, &br_dst);
117 }
118
119 #if IS_ENABLED(CONFIG_IPV6)
120 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
121 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
122 __u16 vid)
123 {
124 struct br_ip br_dst;
125
126 br_dst.u.ip6 = *dst;
127 br_dst.proto = htons(ETH_P_IPV6);
128 br_dst.vid = vid;
129
130 return br_mdb_ip_get(mdb, &br_dst);
131 }
132 #endif
133
134 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
135 struct sk_buff *skb)
136 {
137 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
138 struct br_ip ip;
139
140 if (br->multicast_disabled)
141 return NULL;
142
143 if (BR_INPUT_SKB_CB(skb)->igmp)
144 return NULL;
145
146 ip.proto = skb->protocol;
147
148 switch (skb->protocol) {
149 case htons(ETH_P_IP):
150 ip.u.ip4 = ip_hdr(skb)->daddr;
151 break;
152 #if IS_ENABLED(CONFIG_IPV6)
153 case htons(ETH_P_IPV6):
154 ip.u.ip6 = ipv6_hdr(skb)->daddr;
155 break;
156 #endif
157 default:
158 return NULL;
159 }
160
161 return br_mdb_ip_get(mdb, &ip);
162 }
163
164 static void br_mdb_free(struct rcu_head *head)
165 {
166 struct net_bridge_mdb_htable *mdb =
167 container_of(head, struct net_bridge_mdb_htable, rcu);
168 struct net_bridge_mdb_htable *old = mdb->old;
169
170 mdb->old = NULL;
171 kfree(old->mhash);
172 kfree(old);
173 }
174
175 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
176 struct net_bridge_mdb_htable *old,
177 int elasticity)
178 {
179 struct net_bridge_mdb_entry *mp;
180 int maxlen;
181 int len;
182 int i;
183
184 for (i = 0; i < old->max; i++)
185 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
186 hlist_add_head(&mp->hlist[new->ver],
187 &new->mhash[br_ip_hash(new, &mp->addr)]);
188
189 if (!elasticity)
190 return 0;
191
192 maxlen = 0;
193 for (i = 0; i < new->max; i++) {
194 len = 0;
195 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
196 len++;
197 if (len > maxlen)
198 maxlen = len;
199 }
200
201 return maxlen > elasticity ? -EINVAL : 0;
202 }
203
204 void br_multicast_free_pg(struct rcu_head *head)
205 {
206 struct net_bridge_port_group *p =
207 container_of(head, struct net_bridge_port_group, rcu);
208
209 kfree(p);
210 }
211
212 static void br_multicast_free_group(struct rcu_head *head)
213 {
214 struct net_bridge_mdb_entry *mp =
215 container_of(head, struct net_bridge_mdb_entry, rcu);
216
217 kfree(mp);
218 }
219
220 static void br_multicast_group_expired(unsigned long data)
221 {
222 struct net_bridge_mdb_entry *mp = (void *)data;
223 struct net_bridge *br = mp->br;
224 struct net_bridge_mdb_htable *mdb;
225
226 spin_lock(&br->multicast_lock);
227 if (!netif_running(br->dev) || timer_pending(&mp->timer))
228 goto out;
229
230 mp->mglist = false;
231
232 if (mp->ports)
233 goto out;
234
235 mdb = mlock_dereference(br->mdb, br);
236
237 hlist_del_rcu(&mp->hlist[mdb->ver]);
238 mdb->size--;
239
240 call_rcu_bh(&mp->rcu, br_multicast_free_group);
241
242 out:
243 spin_unlock(&br->multicast_lock);
244 }
245
246 static void br_multicast_del_pg(struct net_bridge *br,
247 struct net_bridge_port_group *pg)
248 {
249 struct net_bridge_mdb_htable *mdb;
250 struct net_bridge_mdb_entry *mp;
251 struct net_bridge_port_group *p;
252 struct net_bridge_port_group __rcu **pp;
253
254 mdb = mlock_dereference(br->mdb, br);
255
256 mp = br_mdb_ip_get(mdb, &pg->addr);
257 if (WARN_ON(!mp))
258 return;
259
260 for (pp = &mp->ports;
261 (p = mlock_dereference(*pp, br)) != NULL;
262 pp = &p->next) {
263 if (p != pg)
264 continue;
265
266 rcu_assign_pointer(*pp, p->next);
267 hlist_del_init(&p->mglist);
268 del_timer(&p->timer);
269 call_rcu_bh(&p->rcu, br_multicast_free_pg);
270
271 if (!mp->ports && !mp->mglist &&
272 netif_running(br->dev))
273 mod_timer(&mp->timer, jiffies);
274
275 return;
276 }
277
278 WARN_ON(1);
279 }
280
281 static void br_multicast_port_group_expired(unsigned long data)
282 {
283 struct net_bridge_port_group *pg = (void *)data;
284 struct net_bridge *br = pg->port->br;
285
286 spin_lock(&br->multicast_lock);
287 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
288 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
289 goto out;
290
291 br_multicast_del_pg(br, pg);
292
293 out:
294 spin_unlock(&br->multicast_lock);
295 }
296
297 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
298 int elasticity)
299 {
300 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
301 struct net_bridge_mdb_htable *mdb;
302 int err;
303
304 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
305 if (!mdb)
306 return -ENOMEM;
307
308 mdb->max = max;
309 mdb->old = old;
310
311 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
312 if (!mdb->mhash) {
313 kfree(mdb);
314 return -ENOMEM;
315 }
316
317 mdb->size = old ? old->size : 0;
318 mdb->ver = old ? old->ver ^ 1 : 0;
319
320 if (!old || elasticity)
321 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
322 else
323 mdb->secret = old->secret;
324
325 if (!old)
326 goto out;
327
328 err = br_mdb_copy(mdb, old, elasticity);
329 if (err) {
330 kfree(mdb->mhash);
331 kfree(mdb);
332 return err;
333 }
334
335 br_mdb_rehash_seq++;
336 call_rcu_bh(&mdb->rcu, br_mdb_free);
337
338 out:
339 rcu_assign_pointer(*mdbp, mdb);
340
341 return 0;
342 }
343
344 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
345 __be32 group)
346 {
347 struct sk_buff *skb;
348 struct igmphdr *ih;
349 struct ethhdr *eth;
350 struct iphdr *iph;
351
352 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
353 sizeof(*ih) + 4);
354 if (!skb)
355 goto out;
356
357 skb->protocol = htons(ETH_P_IP);
358
359 skb_reset_mac_header(skb);
360 eth = eth_hdr(skb);
361
362 memcpy(eth->h_source, br->dev->dev_addr, 6);
363 eth->h_dest[0] = 1;
364 eth->h_dest[1] = 0;
365 eth->h_dest[2] = 0x5e;
366 eth->h_dest[3] = 0;
367 eth->h_dest[4] = 0;
368 eth->h_dest[5] = 1;
369 eth->h_proto = htons(ETH_P_IP);
370 skb_put(skb, sizeof(*eth));
371
372 skb_set_network_header(skb, skb->len);
373 iph = ip_hdr(skb);
374
375 iph->version = 4;
376 iph->ihl = 6;
377 iph->tos = 0xc0;
378 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
379 iph->id = 0;
380 iph->frag_off = htons(IP_DF);
381 iph->ttl = 1;
382 iph->protocol = IPPROTO_IGMP;
383 iph->saddr = 0;
384 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
385 ((u8 *)&iph[1])[0] = IPOPT_RA;
386 ((u8 *)&iph[1])[1] = 4;
387 ((u8 *)&iph[1])[2] = 0;
388 ((u8 *)&iph[1])[3] = 0;
389 ip_send_check(iph);
390 skb_put(skb, 24);
391
392 skb_set_transport_header(skb, skb->len);
393 ih = igmp_hdr(skb);
394 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
395 ih->code = (group ? br->multicast_last_member_interval :
396 br->multicast_query_response_interval) /
397 (HZ / IGMP_TIMER_SCALE);
398 ih->group = group;
399 ih->csum = 0;
400 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
401 skb_put(skb, sizeof(*ih));
402
403 __skb_pull(skb, sizeof(*eth));
404
405 out:
406 return skb;
407 }
408
409 #if IS_ENABLED(CONFIG_IPV6)
410 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
411 const struct in6_addr *group)
412 {
413 struct sk_buff *skb;
414 struct ipv6hdr *ip6h;
415 struct mld_msg *mldq;
416 struct ethhdr *eth;
417 u8 *hopopt;
418 unsigned long interval;
419
420 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
421 8 + sizeof(*mldq));
422 if (!skb)
423 goto out;
424
425 skb->protocol = htons(ETH_P_IPV6);
426
427 /* Ethernet header */
428 skb_reset_mac_header(skb);
429 eth = eth_hdr(skb);
430
431 memcpy(eth->h_source, br->dev->dev_addr, 6);
432 eth->h_proto = htons(ETH_P_IPV6);
433 skb_put(skb, sizeof(*eth));
434
435 /* IPv6 header + HbH option */
436 skb_set_network_header(skb, skb->len);
437 ip6h = ipv6_hdr(skb);
438
439 *(__force __be32 *)ip6h = htonl(0x60000000);
440 ip6h->payload_len = htons(8 + sizeof(*mldq));
441 ip6h->nexthdr = IPPROTO_HOPOPTS;
442 ip6h->hop_limit = 1;
443 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
444 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
445 &ip6h->saddr)) {
446 kfree_skb(skb);
447 return NULL;
448 }
449 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
450
451 hopopt = (u8 *)(ip6h + 1);
452 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
453 hopopt[1] = 0; /* length of HbH */
454 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
455 hopopt[3] = 2; /* Length of RA Option */
456 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
457 hopopt[5] = 0;
458 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
459 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
460
461 skb_put(skb, sizeof(*ip6h) + 8);
462
463 /* ICMPv6 */
464 skb_set_transport_header(skb, skb->len);
465 mldq = (struct mld_msg *) icmp6_hdr(skb);
466
467 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
468 br->multicast_query_response_interval;
469
470 mldq->mld_type = ICMPV6_MGM_QUERY;
471 mldq->mld_code = 0;
472 mldq->mld_cksum = 0;
473 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
474 mldq->mld_reserved = 0;
475 mldq->mld_mca = *group;
476
477 /* checksum */
478 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
479 sizeof(*mldq), IPPROTO_ICMPV6,
480 csum_partial(mldq,
481 sizeof(*mldq), 0));
482 skb_put(skb, sizeof(*mldq));
483
484 __skb_pull(skb, sizeof(*eth));
485
486 out:
487 return skb;
488 }
489 #endif
490
491 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
492 struct br_ip *addr)
493 {
494 switch (addr->proto) {
495 case htons(ETH_P_IP):
496 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
497 #if IS_ENABLED(CONFIG_IPV6)
498 case htons(ETH_P_IPV6):
499 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
500 #endif
501 }
502 return NULL;
503 }
504
505 static struct net_bridge_mdb_entry *br_multicast_get_group(
506 struct net_bridge *br, struct net_bridge_port *port,
507 struct br_ip *group, int hash)
508 {
509 struct net_bridge_mdb_htable *mdb;
510 struct net_bridge_mdb_entry *mp;
511 unsigned int count = 0;
512 unsigned int max;
513 int elasticity;
514 int err;
515
516 mdb = rcu_dereference_protected(br->mdb, 1);
517 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
518 count++;
519 if (unlikely(br_ip_equal(group, &mp->addr)))
520 return mp;
521 }
522
523 elasticity = 0;
524 max = mdb->max;
525
526 if (unlikely(count > br->hash_elasticity && count)) {
527 if (net_ratelimit())
528 br_info(br, "Multicast hash table "
529 "chain limit reached: %s\n",
530 port ? port->dev->name : br->dev->name);
531
532 elasticity = br->hash_elasticity;
533 }
534
535 if (mdb->size >= max) {
536 max *= 2;
537 if (unlikely(max > br->hash_max)) {
538 br_warn(br, "Multicast hash table maximum of %d "
539 "reached, disabling snooping: %s\n",
540 br->hash_max,
541 port ? port->dev->name : br->dev->name);
542 err = -E2BIG;
543 disable:
544 br->multicast_disabled = 1;
545 goto err;
546 }
547 }
548
549 if (max > mdb->max || elasticity) {
550 if (mdb->old) {
551 if (net_ratelimit())
552 br_info(br, "Multicast hash table "
553 "on fire: %s\n",
554 port ? port->dev->name : br->dev->name);
555 err = -EEXIST;
556 goto err;
557 }
558
559 err = br_mdb_rehash(&br->mdb, max, elasticity);
560 if (err) {
561 br_warn(br, "Cannot rehash multicast "
562 "hash table, disabling snooping: %s, %d, %d\n",
563 port ? port->dev->name : br->dev->name,
564 mdb->size, err);
565 goto disable;
566 }
567
568 err = -EAGAIN;
569 goto err;
570 }
571
572 return NULL;
573
574 err:
575 mp = ERR_PTR(err);
576 return mp;
577 }
578
579 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
580 struct net_bridge_port *port, struct br_ip *group)
581 {
582 struct net_bridge_mdb_htable *mdb;
583 struct net_bridge_mdb_entry *mp;
584 int hash;
585 int err;
586
587 mdb = rcu_dereference_protected(br->mdb, 1);
588 if (!mdb) {
589 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
590 if (err)
591 return ERR_PTR(err);
592 goto rehash;
593 }
594
595 hash = br_ip_hash(mdb, group);
596 mp = br_multicast_get_group(br, port, group, hash);
597 switch (PTR_ERR(mp)) {
598 case 0:
599 break;
600
601 case -EAGAIN:
602 rehash:
603 mdb = rcu_dereference_protected(br->mdb, 1);
604 hash = br_ip_hash(mdb, group);
605 break;
606
607 default:
608 goto out;
609 }
610
611 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
612 if (unlikely(!mp))
613 return ERR_PTR(-ENOMEM);
614
615 mp->br = br;
616 mp->addr = *group;
617 setup_timer(&mp->timer, br_multicast_group_expired,
618 (unsigned long)mp);
619
620 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
621 mdb->size++;
622
623 out:
624 return mp;
625 }
626
627 struct net_bridge_port_group *br_multicast_new_port_group(
628 struct net_bridge_port *port,
629 struct br_ip *group,
630 struct net_bridge_port_group __rcu *next,
631 unsigned char state)
632 {
633 struct net_bridge_port_group *p;
634
635 p = kzalloc(sizeof(*p), GFP_ATOMIC);
636 if (unlikely(!p))
637 return NULL;
638
639 p->addr = *group;
640 p->port = port;
641 p->state = state;
642 rcu_assign_pointer(p->next, next);
643 hlist_add_head(&p->mglist, &port->mglist);
644 setup_timer(&p->timer, br_multicast_port_group_expired,
645 (unsigned long)p);
646 return p;
647 }
648
649 static int br_multicast_add_group(struct net_bridge *br,
650 struct net_bridge_port *port,
651 struct br_ip *group)
652 {
653 struct net_bridge_mdb_entry *mp;
654 struct net_bridge_port_group *p;
655 struct net_bridge_port_group __rcu **pp;
656 unsigned long now = jiffies;
657 int err;
658
659 spin_lock(&br->multicast_lock);
660 if (!netif_running(br->dev) ||
661 (port && port->state == BR_STATE_DISABLED))
662 goto out;
663
664 mp = br_multicast_new_group(br, port, group);
665 err = PTR_ERR(mp);
666 if (IS_ERR(mp))
667 goto err;
668
669 if (!port) {
670 mp->mglist = true;
671 mod_timer(&mp->timer, now + br->multicast_membership_interval);
672 goto out;
673 }
674
675 for (pp = &mp->ports;
676 (p = mlock_dereference(*pp, br)) != NULL;
677 pp = &p->next) {
678 if (p->port == port)
679 goto found;
680 if ((unsigned long)p->port < (unsigned long)port)
681 break;
682 }
683
684 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
685 if (unlikely(!p))
686 goto err;
687 rcu_assign_pointer(*pp, p);
688 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
689
690 found:
691 mod_timer(&p->timer, now + br->multicast_membership_interval);
692 out:
693 err = 0;
694
695 err:
696 spin_unlock(&br->multicast_lock);
697 return err;
698 }
699
700 static int br_ip4_multicast_add_group(struct net_bridge *br,
701 struct net_bridge_port *port,
702 __be32 group,
703 __u16 vid)
704 {
705 struct br_ip br_group;
706
707 if (ipv4_is_local_multicast(group))
708 return 0;
709
710 br_group.u.ip4 = group;
711 br_group.proto = htons(ETH_P_IP);
712 br_group.vid = vid;
713
714 return br_multicast_add_group(br, port, &br_group);
715 }
716
717 #if IS_ENABLED(CONFIG_IPV6)
718 static int br_ip6_multicast_add_group(struct net_bridge *br,
719 struct net_bridge_port *port,
720 const struct in6_addr *group,
721 __u16 vid)
722 {
723 struct br_ip br_group;
724
725 if (!ipv6_is_transient_multicast(group))
726 return 0;
727
728 br_group.u.ip6 = *group;
729 br_group.proto = htons(ETH_P_IPV6);
730 br_group.vid = vid;
731
732 return br_multicast_add_group(br, port, &br_group);
733 }
734 #endif
735
736 static void br_multicast_router_expired(unsigned long data)
737 {
738 struct net_bridge_port *port = (void *)data;
739 struct net_bridge *br = port->br;
740
741 spin_lock(&br->multicast_lock);
742 if (port->multicast_router != 1 ||
743 timer_pending(&port->multicast_router_timer) ||
744 hlist_unhashed(&port->rlist))
745 goto out;
746
747 hlist_del_init_rcu(&port->rlist);
748
749 out:
750 spin_unlock(&br->multicast_lock);
751 }
752
753 static void br_multicast_local_router_expired(unsigned long data)
754 {
755 }
756
757 static void br_multicast_querier_expired(unsigned long data)
758 {
759 struct net_bridge *br = (void *)data;
760
761 spin_lock(&br->multicast_lock);
762 if (!netif_running(br->dev) || br->multicast_disabled)
763 goto out;
764
765 br_multicast_start_querier(br);
766
767 out:
768 spin_unlock(&br->multicast_lock);
769 }
770
771 static void __br_multicast_send_query(struct net_bridge *br,
772 struct net_bridge_port *port,
773 struct br_ip *ip)
774 {
775 struct sk_buff *skb;
776
777 skb = br_multicast_alloc_query(br, ip);
778 if (!skb)
779 return;
780
781 if (port) {
782 __skb_push(skb, sizeof(struct ethhdr));
783 skb->dev = port->dev;
784 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
785 dev_queue_xmit);
786 } else
787 netif_rx(skb);
788 }
789
790 static void br_multicast_send_query(struct net_bridge *br,
791 struct net_bridge_port *port, u32 sent)
792 {
793 unsigned long time;
794 struct br_ip br_group;
795
796 if (!netif_running(br->dev) || br->multicast_disabled ||
797 !br->multicast_querier ||
798 timer_pending(&br->multicast_querier_timer))
799 return;
800
801 memset(&br_group.u, 0, sizeof(br_group.u));
802
803 br_group.proto = htons(ETH_P_IP);
804 __br_multicast_send_query(br, port, &br_group);
805
806 #if IS_ENABLED(CONFIG_IPV6)
807 br_group.proto = htons(ETH_P_IPV6);
808 __br_multicast_send_query(br, port, &br_group);
809 #endif
810
811 time = jiffies;
812 time += sent < br->multicast_startup_query_count ?
813 br->multicast_startup_query_interval :
814 br->multicast_query_interval;
815 mod_timer(port ? &port->multicast_query_timer :
816 &br->multicast_query_timer, time);
817 }
818
819 static void br_multicast_port_query_expired(unsigned long data)
820 {
821 struct net_bridge_port *port = (void *)data;
822 struct net_bridge *br = port->br;
823
824 spin_lock(&br->multicast_lock);
825 if (port->state == BR_STATE_DISABLED ||
826 port->state == BR_STATE_BLOCKING)
827 goto out;
828
829 if (port->multicast_startup_queries_sent <
830 br->multicast_startup_query_count)
831 port->multicast_startup_queries_sent++;
832
833 br_multicast_send_query(port->br, port,
834 port->multicast_startup_queries_sent);
835
836 out:
837 spin_unlock(&br->multicast_lock);
838 }
839
840 void br_multicast_add_port(struct net_bridge_port *port)
841 {
842 port->multicast_router = 1;
843
844 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
845 (unsigned long)port);
846 setup_timer(&port->multicast_query_timer,
847 br_multicast_port_query_expired, (unsigned long)port);
848 }
849
850 void br_multicast_del_port(struct net_bridge_port *port)
851 {
852 del_timer_sync(&port->multicast_router_timer);
853 }
854
855 static void __br_multicast_enable_port(struct net_bridge_port *port)
856 {
857 port->multicast_startup_queries_sent = 0;
858
859 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
860 del_timer(&port->multicast_query_timer))
861 mod_timer(&port->multicast_query_timer, jiffies);
862 }
863
864 void br_multicast_enable_port(struct net_bridge_port *port)
865 {
866 struct net_bridge *br = port->br;
867
868 spin_lock(&br->multicast_lock);
869 if (br->multicast_disabled || !netif_running(br->dev))
870 goto out;
871
872 __br_multicast_enable_port(port);
873
874 out:
875 spin_unlock(&br->multicast_lock);
876 }
877
878 void br_multicast_disable_port(struct net_bridge_port *port)
879 {
880 struct net_bridge *br = port->br;
881 struct net_bridge_port_group *pg;
882 struct hlist_node *n;
883
884 spin_lock(&br->multicast_lock);
885 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
886 br_multicast_del_pg(br, pg);
887
888 if (!hlist_unhashed(&port->rlist))
889 hlist_del_init_rcu(&port->rlist);
890 del_timer(&port->multicast_router_timer);
891 del_timer(&port->multicast_query_timer);
892 spin_unlock(&br->multicast_lock);
893 }
894
895 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
896 struct net_bridge_port *port,
897 struct sk_buff *skb)
898 {
899 struct igmpv3_report *ih;
900 struct igmpv3_grec *grec;
901 int i;
902 int len;
903 int num;
904 int type;
905 int err = 0;
906 __be32 group;
907 u16 vid = 0;
908
909 if (!pskb_may_pull(skb, sizeof(*ih)))
910 return -EINVAL;
911
912 br_vlan_get_tag(skb, &vid);
913 ih = igmpv3_report_hdr(skb);
914 num = ntohs(ih->ngrec);
915 len = sizeof(*ih);
916
917 for (i = 0; i < num; i++) {
918 len += sizeof(*grec);
919 if (!pskb_may_pull(skb, len))
920 return -EINVAL;
921
922 grec = (void *)(skb->data + len - sizeof(*grec));
923 group = grec->grec_mca;
924 type = grec->grec_type;
925
926 len += ntohs(grec->grec_nsrcs) * 4;
927 if (!pskb_may_pull(skb, len))
928 return -EINVAL;
929
930 /* We treat this as an IGMPv2 report for now. */
931 switch (type) {
932 case IGMPV3_MODE_IS_INCLUDE:
933 case IGMPV3_MODE_IS_EXCLUDE:
934 case IGMPV3_CHANGE_TO_INCLUDE:
935 case IGMPV3_CHANGE_TO_EXCLUDE:
936 case IGMPV3_ALLOW_NEW_SOURCES:
937 case IGMPV3_BLOCK_OLD_SOURCES:
938 break;
939
940 default:
941 continue;
942 }
943
944 err = br_ip4_multicast_add_group(br, port, group, vid);
945 if (err)
946 break;
947 }
948
949 return err;
950 }
951
952 #if IS_ENABLED(CONFIG_IPV6)
953 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
954 struct net_bridge_port *port,
955 struct sk_buff *skb)
956 {
957 struct icmp6hdr *icmp6h;
958 struct mld2_grec *grec;
959 int i;
960 int len;
961 int num;
962 int err = 0;
963 u16 vid = 0;
964
965 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
966 return -EINVAL;
967
968 br_vlan_get_tag(skb, &vid);
969 icmp6h = icmp6_hdr(skb);
970 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
971 len = sizeof(*icmp6h);
972
973 for (i = 0; i < num; i++) {
974 __be16 *nsrcs, _nsrcs;
975
976 nsrcs = skb_header_pointer(skb,
977 len + offsetof(struct mld2_grec,
978 grec_nsrcs),
979 sizeof(_nsrcs), &_nsrcs);
980 if (!nsrcs)
981 return -EINVAL;
982
983 if (!pskb_may_pull(skb,
984 len + sizeof(*grec) +
985 sizeof(struct in6_addr) * ntohs(*nsrcs)))
986 return -EINVAL;
987
988 grec = (struct mld2_grec *)(skb->data + len);
989 len += sizeof(*grec) +
990 sizeof(struct in6_addr) * ntohs(*nsrcs);
991
992 /* We treat these as MLDv1 reports for now. */
993 switch (grec->grec_type) {
994 case MLD2_MODE_IS_INCLUDE:
995 case MLD2_MODE_IS_EXCLUDE:
996 case MLD2_CHANGE_TO_INCLUDE:
997 case MLD2_CHANGE_TO_EXCLUDE:
998 case MLD2_ALLOW_NEW_SOURCES:
999 case MLD2_BLOCK_OLD_SOURCES:
1000 break;
1001
1002 default:
1003 continue;
1004 }
1005
1006 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1007 vid);
1008 if (!err)
1009 break;
1010 }
1011
1012 return err;
1013 }
1014 #endif
1015
1016 /*
1017 * Add port to rotuer_list
1018 * list is maintained ordered by pointer value
1019 * and locked by br->multicast_lock and RCU
1020 */
1021 static void br_multicast_add_router(struct net_bridge *br,
1022 struct net_bridge_port *port)
1023 {
1024 struct net_bridge_port *p;
1025 struct hlist_node *slot = NULL;
1026
1027 hlist_for_each_entry(p, &br->router_list, rlist) {
1028 if ((unsigned long) port >= (unsigned long) p)
1029 break;
1030 slot = &p->rlist;
1031 }
1032
1033 if (slot)
1034 hlist_add_after_rcu(slot, &port->rlist);
1035 else
1036 hlist_add_head_rcu(&port->rlist, &br->router_list);
1037 }
1038
1039 static void br_multicast_mark_router(struct net_bridge *br,
1040 struct net_bridge_port *port)
1041 {
1042 unsigned long now = jiffies;
1043
1044 if (!port) {
1045 if (br->multicast_router == 1)
1046 mod_timer(&br->multicast_router_timer,
1047 now + br->multicast_querier_interval);
1048 return;
1049 }
1050
1051 if (port->multicast_router != 1)
1052 return;
1053
1054 if (!hlist_unhashed(&port->rlist))
1055 goto timer;
1056
1057 br_multicast_add_router(br, port);
1058
1059 timer:
1060 mod_timer(&port->multicast_router_timer,
1061 now + br->multicast_querier_interval);
1062 }
1063
1064 static void br_multicast_query_received(struct net_bridge *br,
1065 struct net_bridge_port *port,
1066 int saddr)
1067 {
1068 if (saddr)
1069 mod_timer(&br->multicast_querier_timer,
1070 jiffies + br->multicast_querier_interval);
1071 else if (timer_pending(&br->multicast_querier_timer))
1072 return;
1073
1074 br_multicast_mark_router(br, port);
1075 }
1076
1077 static int br_ip4_multicast_query(struct net_bridge *br,
1078 struct net_bridge_port *port,
1079 struct sk_buff *skb)
1080 {
1081 const struct iphdr *iph = ip_hdr(skb);
1082 struct igmphdr *ih = igmp_hdr(skb);
1083 struct net_bridge_mdb_entry *mp;
1084 struct igmpv3_query *ih3;
1085 struct net_bridge_port_group *p;
1086 struct net_bridge_port_group __rcu **pp;
1087 unsigned long max_delay;
1088 unsigned long now = jiffies;
1089 __be32 group;
1090 int err = 0;
1091 u16 vid = 0;
1092
1093 spin_lock(&br->multicast_lock);
1094 if (!netif_running(br->dev) ||
1095 (port && port->state == BR_STATE_DISABLED))
1096 goto out;
1097
1098 br_multicast_query_received(br, port, !!iph->saddr);
1099
1100 group = ih->group;
1101
1102 if (skb->len == sizeof(*ih)) {
1103 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1104
1105 if (!max_delay) {
1106 max_delay = 10 * HZ;
1107 group = 0;
1108 }
1109 } else {
1110 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1111 err = -EINVAL;
1112 goto out;
1113 }
1114
1115 ih3 = igmpv3_query_hdr(skb);
1116 if (ih3->nsrcs)
1117 goto out;
1118
1119 max_delay = ih3->code ?
1120 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1121 }
1122
1123 if (!group)
1124 goto out;
1125
1126 br_vlan_get_tag(skb, &vid);
1127 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1128 if (!mp)
1129 goto out;
1130
1131 max_delay *= br->multicast_last_member_count;
1132
1133 if (mp->mglist &&
1134 (timer_pending(&mp->timer) ?
1135 time_after(mp->timer.expires, now + max_delay) :
1136 try_to_del_timer_sync(&mp->timer) >= 0))
1137 mod_timer(&mp->timer, now + max_delay);
1138
1139 for (pp = &mp->ports;
1140 (p = mlock_dereference(*pp, br)) != NULL;
1141 pp = &p->next) {
1142 if (timer_pending(&p->timer) ?
1143 time_after(p->timer.expires, now + max_delay) :
1144 try_to_del_timer_sync(&p->timer) >= 0)
1145 mod_timer(&p->timer, now + max_delay);
1146 }
1147
1148 out:
1149 spin_unlock(&br->multicast_lock);
1150 return err;
1151 }
1152
1153 #if IS_ENABLED(CONFIG_IPV6)
1154 static int br_ip6_multicast_query(struct net_bridge *br,
1155 struct net_bridge_port *port,
1156 struct sk_buff *skb)
1157 {
1158 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1159 struct mld_msg *mld;
1160 struct net_bridge_mdb_entry *mp;
1161 struct mld2_query *mld2q;
1162 struct net_bridge_port_group *p;
1163 struct net_bridge_port_group __rcu **pp;
1164 unsigned long max_delay;
1165 unsigned long now = jiffies;
1166 const struct in6_addr *group = NULL;
1167 int err = 0;
1168 u16 vid = 0;
1169
1170 spin_lock(&br->multicast_lock);
1171 if (!netif_running(br->dev) ||
1172 (port && port->state == BR_STATE_DISABLED))
1173 goto out;
1174
1175 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1176
1177 if (skb->len == sizeof(*mld)) {
1178 if (!pskb_may_pull(skb, sizeof(*mld))) {
1179 err = -EINVAL;
1180 goto out;
1181 }
1182 mld = (struct mld_msg *) icmp6_hdr(skb);
1183 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1184 if (max_delay)
1185 group = &mld->mld_mca;
1186 } else if (skb->len >= sizeof(*mld2q)) {
1187 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1188 err = -EINVAL;
1189 goto out;
1190 }
1191 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1192 if (!mld2q->mld2q_nsrcs)
1193 group = &mld2q->mld2q_mca;
1194 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(ntohs(mld2q->mld2q_mrc)) : 1;
1195 }
1196
1197 if (!group)
1198 goto out;
1199
1200 br_vlan_get_tag(skb, &vid);
1201 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1202 if (!mp)
1203 goto out;
1204
1205 max_delay *= br->multicast_last_member_count;
1206 if (mp->mglist &&
1207 (timer_pending(&mp->timer) ?
1208 time_after(mp->timer.expires, now + max_delay) :
1209 try_to_del_timer_sync(&mp->timer) >= 0))
1210 mod_timer(&mp->timer, now + max_delay);
1211
1212 for (pp = &mp->ports;
1213 (p = mlock_dereference(*pp, br)) != NULL;
1214 pp = &p->next) {
1215 if (timer_pending(&p->timer) ?
1216 time_after(p->timer.expires, now + max_delay) :
1217 try_to_del_timer_sync(&p->timer) >= 0)
1218 mod_timer(&p->timer, now + max_delay);
1219 }
1220
1221 out:
1222 spin_unlock(&br->multicast_lock);
1223 return err;
1224 }
1225 #endif
1226
1227 static void br_multicast_leave_group(struct net_bridge *br,
1228 struct net_bridge_port *port,
1229 struct br_ip *group)
1230 {
1231 struct net_bridge_mdb_htable *mdb;
1232 struct net_bridge_mdb_entry *mp;
1233 struct net_bridge_port_group *p;
1234 unsigned long now;
1235 unsigned long time;
1236
1237 spin_lock(&br->multicast_lock);
1238 if (!netif_running(br->dev) ||
1239 (port && port->state == BR_STATE_DISABLED) ||
1240 timer_pending(&br->multicast_querier_timer))
1241 goto out;
1242
1243 mdb = mlock_dereference(br->mdb, br);
1244 mp = br_mdb_ip_get(mdb, group);
1245 if (!mp)
1246 goto out;
1247
1248 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1249 struct net_bridge_port_group __rcu **pp;
1250
1251 for (pp = &mp->ports;
1252 (p = mlock_dereference(*pp, br)) != NULL;
1253 pp = &p->next) {
1254 if (p->port != port)
1255 continue;
1256
1257 rcu_assign_pointer(*pp, p->next);
1258 hlist_del_init(&p->mglist);
1259 del_timer(&p->timer);
1260 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1261 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1262
1263 if (!mp->ports && !mp->mglist &&
1264 netif_running(br->dev))
1265 mod_timer(&mp->timer, jiffies);
1266 }
1267 goto out;
1268 }
1269
1270 now = jiffies;
1271 time = now + br->multicast_last_member_count *
1272 br->multicast_last_member_interval;
1273
1274 if (!port) {
1275 if (mp->mglist &&
1276 (timer_pending(&mp->timer) ?
1277 time_after(mp->timer.expires, time) :
1278 try_to_del_timer_sync(&mp->timer) >= 0)) {
1279 mod_timer(&mp->timer, time);
1280 }
1281
1282 goto out;
1283 }
1284
1285 for (p = mlock_dereference(mp->ports, br);
1286 p != NULL;
1287 p = mlock_dereference(p->next, br)) {
1288 if (p->port != port)
1289 continue;
1290
1291 if (!hlist_unhashed(&p->mglist) &&
1292 (timer_pending(&p->timer) ?
1293 time_after(p->timer.expires, time) :
1294 try_to_del_timer_sync(&p->timer) >= 0)) {
1295 mod_timer(&p->timer, time);
1296 }
1297
1298 break;
1299 }
1300
1301 out:
1302 spin_unlock(&br->multicast_lock);
1303 }
1304
1305 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1306 struct net_bridge_port *port,
1307 __be32 group,
1308 __u16 vid)
1309 {
1310 struct br_ip br_group;
1311
1312 if (ipv4_is_local_multicast(group))
1313 return;
1314
1315 br_group.u.ip4 = group;
1316 br_group.proto = htons(ETH_P_IP);
1317 br_group.vid = vid;
1318
1319 br_multicast_leave_group(br, port, &br_group);
1320 }
1321
1322 #if IS_ENABLED(CONFIG_IPV6)
1323 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1324 struct net_bridge_port *port,
1325 const struct in6_addr *group,
1326 __u16 vid)
1327 {
1328 struct br_ip br_group;
1329
1330 if (!ipv6_is_transient_multicast(group))
1331 return;
1332
1333 br_group.u.ip6 = *group;
1334 br_group.proto = htons(ETH_P_IPV6);
1335 br_group.vid = vid;
1336
1337 br_multicast_leave_group(br, port, &br_group);
1338 }
1339 #endif
1340
1341 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1342 struct net_bridge_port *port,
1343 struct sk_buff *skb)
1344 {
1345 struct sk_buff *skb2 = skb;
1346 const struct iphdr *iph;
1347 struct igmphdr *ih;
1348 unsigned int len;
1349 unsigned int offset;
1350 int err;
1351 u16 vid = 0;
1352
1353 /* We treat OOM as packet loss for now. */
1354 if (!pskb_may_pull(skb, sizeof(*iph)))
1355 return -EINVAL;
1356
1357 iph = ip_hdr(skb);
1358
1359 if (iph->ihl < 5 || iph->version != 4)
1360 return -EINVAL;
1361
1362 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1363 return -EINVAL;
1364
1365 iph = ip_hdr(skb);
1366
1367 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1368 return -EINVAL;
1369
1370 if (iph->protocol != IPPROTO_IGMP) {
1371 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
1372 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1373 return 0;
1374 }
1375
1376 len = ntohs(iph->tot_len);
1377 if (skb->len < len || len < ip_hdrlen(skb))
1378 return -EINVAL;
1379
1380 if (skb->len > len) {
1381 skb2 = skb_clone(skb, GFP_ATOMIC);
1382 if (!skb2)
1383 return -ENOMEM;
1384
1385 err = pskb_trim_rcsum(skb2, len);
1386 if (err)
1387 goto err_out;
1388 }
1389
1390 len -= ip_hdrlen(skb2);
1391 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1392 __skb_pull(skb2, offset);
1393 skb_reset_transport_header(skb2);
1394
1395 err = -EINVAL;
1396 if (!pskb_may_pull(skb2, sizeof(*ih)))
1397 goto out;
1398
1399 switch (skb2->ip_summed) {
1400 case CHECKSUM_COMPLETE:
1401 if (!csum_fold(skb2->csum))
1402 break;
1403 /* fall through */
1404 case CHECKSUM_NONE:
1405 skb2->csum = 0;
1406 if (skb_checksum_complete(skb2))
1407 goto out;
1408 }
1409
1410 err = 0;
1411
1412 br_vlan_get_tag(skb2, &vid);
1413 BR_INPUT_SKB_CB(skb)->igmp = 1;
1414 ih = igmp_hdr(skb2);
1415
1416 switch (ih->type) {
1417 case IGMP_HOST_MEMBERSHIP_REPORT:
1418 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1419 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1420 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1421 break;
1422 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1423 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1424 break;
1425 case IGMP_HOST_MEMBERSHIP_QUERY:
1426 err = br_ip4_multicast_query(br, port, skb2);
1427 break;
1428 case IGMP_HOST_LEAVE_MESSAGE:
1429 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1430 break;
1431 }
1432
1433 out:
1434 __skb_push(skb2, offset);
1435 err_out:
1436 if (skb2 != skb)
1437 kfree_skb(skb2);
1438 return err;
1439 }
1440
1441 #if IS_ENABLED(CONFIG_IPV6)
1442 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1443 struct net_bridge_port *port,
1444 struct sk_buff *skb)
1445 {
1446 struct sk_buff *skb2;
1447 const struct ipv6hdr *ip6h;
1448 u8 icmp6_type;
1449 u8 nexthdr;
1450 __be16 frag_off;
1451 unsigned int len;
1452 int offset;
1453 int err;
1454 u16 vid = 0;
1455
1456 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1457 return -EINVAL;
1458
1459 ip6h = ipv6_hdr(skb);
1460
1461 /*
1462 * We're interested in MLD messages only.
1463 * - Version is 6
1464 * - MLD has always Router Alert hop-by-hop option
1465 * - But we do not support jumbrograms.
1466 */
1467 if (ip6h->version != 6 ||
1468 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1469 ip6h->payload_len == 0)
1470 return 0;
1471
1472 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1473 if (skb->len < len)
1474 return -EINVAL;
1475
1476 nexthdr = ip6h->nexthdr;
1477 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1478
1479 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1480 return 0;
1481
1482 /* Okay, we found ICMPv6 header */
1483 skb2 = skb_clone(skb, GFP_ATOMIC);
1484 if (!skb2)
1485 return -ENOMEM;
1486
1487 err = -EINVAL;
1488 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1489 goto out;
1490
1491 len -= offset - skb_network_offset(skb2);
1492
1493 __skb_pull(skb2, offset);
1494 skb_reset_transport_header(skb2);
1495 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1496 skb_network_header_len(skb2));
1497
1498 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1499
1500 switch (icmp6_type) {
1501 case ICMPV6_MGM_QUERY:
1502 case ICMPV6_MGM_REPORT:
1503 case ICMPV6_MGM_REDUCTION:
1504 case ICMPV6_MLD2_REPORT:
1505 break;
1506 default:
1507 err = 0;
1508 goto out;
1509 }
1510
1511 /* Okay, we found MLD message. Check further. */
1512 if (skb2->len > len) {
1513 err = pskb_trim_rcsum(skb2, len);
1514 if (err)
1515 goto out;
1516 err = -EINVAL;
1517 }
1518
1519 ip6h = ipv6_hdr(skb2);
1520
1521 switch (skb2->ip_summed) {
1522 case CHECKSUM_COMPLETE:
1523 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1524 IPPROTO_ICMPV6, skb2->csum))
1525 break;
1526 /*FALLTHROUGH*/
1527 case CHECKSUM_NONE:
1528 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1529 &ip6h->daddr,
1530 skb2->len,
1531 IPPROTO_ICMPV6, 0));
1532 if (__skb_checksum_complete(skb2))
1533 goto out;
1534 }
1535
1536 err = 0;
1537
1538 br_vlan_get_tag(skb, &vid);
1539 BR_INPUT_SKB_CB(skb)->igmp = 1;
1540
1541 switch (icmp6_type) {
1542 case ICMPV6_MGM_REPORT:
1543 {
1544 struct mld_msg *mld;
1545 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1546 err = -EINVAL;
1547 goto out;
1548 }
1549 mld = (struct mld_msg *)skb_transport_header(skb2);
1550 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1551 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1552 break;
1553 }
1554 case ICMPV6_MLD2_REPORT:
1555 err = br_ip6_multicast_mld2_report(br, port, skb2);
1556 break;
1557 case ICMPV6_MGM_QUERY:
1558 err = br_ip6_multicast_query(br, port, skb2);
1559 break;
1560 case ICMPV6_MGM_REDUCTION:
1561 {
1562 struct mld_msg *mld;
1563 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1564 err = -EINVAL;
1565 goto out;
1566 }
1567 mld = (struct mld_msg *)skb_transport_header(skb2);
1568 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1569 }
1570 }
1571
1572 out:
1573 kfree_skb(skb2);
1574 return err;
1575 }
1576 #endif
1577
1578 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1579 struct sk_buff *skb)
1580 {
1581 BR_INPUT_SKB_CB(skb)->igmp = 0;
1582 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1583
1584 if (br->multicast_disabled)
1585 return 0;
1586
1587 switch (skb->protocol) {
1588 case htons(ETH_P_IP):
1589 return br_multicast_ipv4_rcv(br, port, skb);
1590 #if IS_ENABLED(CONFIG_IPV6)
1591 case htons(ETH_P_IPV6):
1592 return br_multicast_ipv6_rcv(br, port, skb);
1593 #endif
1594 }
1595
1596 return 0;
1597 }
1598
1599 static void br_multicast_query_expired(unsigned long data)
1600 {
1601 struct net_bridge *br = (void *)data;
1602
1603 spin_lock(&br->multicast_lock);
1604 if (br->multicast_startup_queries_sent <
1605 br->multicast_startup_query_count)
1606 br->multicast_startup_queries_sent++;
1607
1608 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1609
1610 spin_unlock(&br->multicast_lock);
1611 }
1612
1613 void br_multicast_init(struct net_bridge *br)
1614 {
1615 br->hash_elasticity = 4;
1616 br->hash_max = 512;
1617
1618 br->multicast_router = 1;
1619 br->multicast_querier = 0;
1620 br->multicast_last_member_count = 2;
1621 br->multicast_startup_query_count = 2;
1622
1623 br->multicast_last_member_interval = HZ;
1624 br->multicast_query_response_interval = 10 * HZ;
1625 br->multicast_startup_query_interval = 125 * HZ / 4;
1626 br->multicast_query_interval = 125 * HZ;
1627 br->multicast_querier_interval = 255 * HZ;
1628 br->multicast_membership_interval = 260 * HZ;
1629
1630 spin_lock_init(&br->multicast_lock);
1631 setup_timer(&br->multicast_router_timer,
1632 br_multicast_local_router_expired, 0);
1633 setup_timer(&br->multicast_querier_timer,
1634 br_multicast_querier_expired, (unsigned long)br);
1635 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1636 (unsigned long)br);
1637 }
1638
1639 void br_multicast_open(struct net_bridge *br)
1640 {
1641 br->multicast_startup_queries_sent = 0;
1642
1643 if (br->multicast_disabled)
1644 return;
1645
1646 mod_timer(&br->multicast_query_timer, jiffies);
1647 }
1648
1649 void br_multicast_stop(struct net_bridge *br)
1650 {
1651 struct net_bridge_mdb_htable *mdb;
1652 struct net_bridge_mdb_entry *mp;
1653 struct hlist_node *n;
1654 u32 ver;
1655 int i;
1656
1657 del_timer_sync(&br->multicast_router_timer);
1658 del_timer_sync(&br->multicast_querier_timer);
1659 del_timer_sync(&br->multicast_query_timer);
1660
1661 spin_lock_bh(&br->multicast_lock);
1662 mdb = mlock_dereference(br->mdb, br);
1663 if (!mdb)
1664 goto out;
1665
1666 br->mdb = NULL;
1667
1668 ver = mdb->ver;
1669 for (i = 0; i < mdb->max; i++) {
1670 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1671 hlist[ver]) {
1672 del_timer(&mp->timer);
1673 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1674 }
1675 }
1676
1677 if (mdb->old) {
1678 spin_unlock_bh(&br->multicast_lock);
1679 rcu_barrier_bh();
1680 spin_lock_bh(&br->multicast_lock);
1681 WARN_ON(mdb->old);
1682 }
1683
1684 mdb->old = mdb;
1685 call_rcu_bh(&mdb->rcu, br_mdb_free);
1686
1687 out:
1688 spin_unlock_bh(&br->multicast_lock);
1689 }
1690
1691 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1692 {
1693 int err = -ENOENT;
1694
1695 spin_lock_bh(&br->multicast_lock);
1696 if (!netif_running(br->dev))
1697 goto unlock;
1698
1699 switch (val) {
1700 case 0:
1701 case 2:
1702 del_timer(&br->multicast_router_timer);
1703 /* fall through */
1704 case 1:
1705 br->multicast_router = val;
1706 err = 0;
1707 break;
1708
1709 default:
1710 err = -EINVAL;
1711 break;
1712 }
1713
1714 unlock:
1715 spin_unlock_bh(&br->multicast_lock);
1716
1717 return err;
1718 }
1719
1720 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1721 {
1722 struct net_bridge *br = p->br;
1723 int err = -ENOENT;
1724
1725 spin_lock(&br->multicast_lock);
1726 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1727 goto unlock;
1728
1729 switch (val) {
1730 case 0:
1731 case 1:
1732 case 2:
1733 p->multicast_router = val;
1734 err = 0;
1735
1736 if (val < 2 && !hlist_unhashed(&p->rlist))
1737 hlist_del_init_rcu(&p->rlist);
1738
1739 if (val == 1)
1740 break;
1741
1742 del_timer(&p->multicast_router_timer);
1743
1744 if (val == 0)
1745 break;
1746
1747 br_multicast_add_router(br, p);
1748 break;
1749
1750 default:
1751 err = -EINVAL;
1752 break;
1753 }
1754
1755 unlock:
1756 spin_unlock(&br->multicast_lock);
1757
1758 return err;
1759 }
1760
1761 static void br_multicast_start_querier(struct net_bridge *br)
1762 {
1763 struct net_bridge_port *port;
1764
1765 br_multicast_open(br);
1766
1767 list_for_each_entry(port, &br->port_list, list) {
1768 if (port->state == BR_STATE_DISABLED ||
1769 port->state == BR_STATE_BLOCKING)
1770 continue;
1771
1772 __br_multicast_enable_port(port);
1773 }
1774 }
1775
1776 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1777 {
1778 int err = 0;
1779 struct net_bridge_mdb_htable *mdb;
1780
1781 spin_lock_bh(&br->multicast_lock);
1782 if (br->multicast_disabled == !val)
1783 goto unlock;
1784
1785 br->multicast_disabled = !val;
1786 if (br->multicast_disabled)
1787 goto unlock;
1788
1789 if (!netif_running(br->dev))
1790 goto unlock;
1791
1792 mdb = mlock_dereference(br->mdb, br);
1793 if (mdb) {
1794 if (mdb->old) {
1795 err = -EEXIST;
1796 rollback:
1797 br->multicast_disabled = !!val;
1798 goto unlock;
1799 }
1800
1801 err = br_mdb_rehash(&br->mdb, mdb->max,
1802 br->hash_elasticity);
1803 if (err)
1804 goto rollback;
1805 }
1806
1807 br_multicast_start_querier(br);
1808
1809 unlock:
1810 spin_unlock_bh(&br->multicast_lock);
1811
1812 return err;
1813 }
1814
1815 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1816 {
1817 val = !!val;
1818
1819 spin_lock_bh(&br->multicast_lock);
1820 if (br->multicast_querier == val)
1821 goto unlock;
1822
1823 br->multicast_querier = val;
1824 if (val)
1825 br_multicast_start_querier(br);
1826
1827 unlock:
1828 spin_unlock_bh(&br->multicast_lock);
1829
1830 return 0;
1831 }
1832
1833 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1834 {
1835 int err = -ENOENT;
1836 u32 old;
1837 struct net_bridge_mdb_htable *mdb;
1838
1839 spin_lock(&br->multicast_lock);
1840 if (!netif_running(br->dev))
1841 goto unlock;
1842
1843 err = -EINVAL;
1844 if (!is_power_of_2(val))
1845 goto unlock;
1846
1847 mdb = mlock_dereference(br->mdb, br);
1848 if (mdb && val < mdb->size)
1849 goto unlock;
1850
1851 err = 0;
1852
1853 old = br->hash_max;
1854 br->hash_max = val;
1855
1856 if (mdb) {
1857 if (mdb->old) {
1858 err = -EEXIST;
1859 rollback:
1860 br->hash_max = old;
1861 goto unlock;
1862 }
1863
1864 err = br_mdb_rehash(&br->mdb, br->hash_max,
1865 br->hash_elasticity);
1866 if (err)
1867 goto rollback;
1868 }
1869
1870 unlock:
1871 spin_unlock(&br->multicast_lock);
1872
1873 return err;
1874 }
kernel source for telekom puls (alcatel/mediatek)