?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.8.3
[linux/fpc-iii.git] / net / bridge / br_multicast.c
blobc5fea9393946f64af336873645db82d09599d442
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/export.h>
15 #include <linux/if_ether.h>
16 #include <linux/igmp.h>
17 #include <linux/jhash.h>
18 #include <linux/kernel.h>
19 #include <linux/log2.h>
20 #include <linux/netdevice.h>
21 #include <linux/netfilter_bridge.h>
22 #include <linux/random.h>
23 #include <linux/rculist.h>
24 #include <linux/skbuff.h>
25 #include <linux/slab.h>
26 #include <linux/timer.h>
27 #include <linux/inetdevice.h>
28 #include <net/ip.h>
29 #if IS_ENABLED(CONFIG_IPV6)
30 #include <net/ipv6.h>
31 #include <net/mld.h>
32 #include <net/ip6_checksum.h>
33 #include <net/addrconf.h>
34 #endif
35
36 #include "br_private.h"
37
38 static void br_multicast_start_querier(struct net_bridge *br,
39 struct bridge_mcast_own_query *query);
40 static void br_multicast_add_router(struct net_bridge *br,
41 struct net_bridge_port *port);
42 static void br_ip4_multicast_leave_group(struct net_bridge *br,
43 struct net_bridge_port *port,
44 __be32 group,
45 __u16 vid);
46 #if IS_ENABLED(CONFIG_IPV6)
47 static void br_ip6_multicast_leave_group(struct net_bridge *br,
48 struct net_bridge_port *port,
49 const struct in6_addr *group,
50 __u16 vid);
51 #endif
52 unsigned int br_mdb_rehash_seq;
53
54 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
55 {
56 if (a->proto != b->proto)
57 return 0;
58 if (a->vid != b->vid)
59 return 0;
60 switch (a->proto) {
61 case htons(ETH_P_IP):
62 return a->u.ip4 == b->u.ip4;
63 #if IS_ENABLED(CONFIG_IPV6)
64 case htons(ETH_P_IPV6):
65 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
66 #endif
67 }
68 return 0;
69 }
70
71 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
72 __u16 vid)
73 {
74 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
75 }
76
77 #if IS_ENABLED(CONFIG_IPV6)
78 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
79 const struct in6_addr *ip,
80 __u16 vid)
81 {
82 return jhash_2words(ipv6_addr_hash(ip), vid,
83 mdb->secret) & (mdb->max - 1);
84 }
85 #endif
86
87 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
88 struct br_ip *ip)
89 {
90 switch (ip->proto) {
91 case htons(ETH_P_IP):
92 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
93 #if IS_ENABLED(CONFIG_IPV6)
94 case htons(ETH_P_IPV6):
95 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
96 #endif
97 }
98 return 0;
99 }
100
101 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
102 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
103 {
104 struct net_bridge_mdb_entry *mp;
105
106 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
107 if (br_ip_equal(&mp->addr, dst))
108 return mp;
109 }
110
111 return NULL;
112 }
113
114 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
115 struct br_ip *dst)
116 {
117 if (!mdb)
118 return NULL;
119
120 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
121 }
122
123 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
124 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
125 {
126 struct br_ip br_dst;
127
128 br_dst.u.ip4 = dst;
129 br_dst.proto = htons(ETH_P_IP);
130 br_dst.vid = vid;
131
132 return br_mdb_ip_get(mdb, &br_dst);
133 }
134
135 #if IS_ENABLED(CONFIG_IPV6)
136 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
137 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
138 __u16 vid)
139 {
140 struct br_ip br_dst;
141
142 br_dst.u.ip6 = *dst;
143 br_dst.proto = htons(ETH_P_IPV6);
144 br_dst.vid = vid;
145
146 return br_mdb_ip_get(mdb, &br_dst);
147 }
148 #endif
149
150 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
151 struct sk_buff *skb, u16 vid)
152 {
153 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
154 struct br_ip ip;
155
156 if (br->multicast_disabled)
157 return NULL;
158
159 if (BR_INPUT_SKB_CB(skb)->igmp)
160 return NULL;
161
162 ip.proto = skb->protocol;
163 ip.vid = vid;
164
165 switch (skb->protocol) {
166 case htons(ETH_P_IP):
167 ip.u.ip4 = ip_hdr(skb)->daddr;
168 break;
169 #if IS_ENABLED(CONFIG_IPV6)
170 case htons(ETH_P_IPV6):
171 ip.u.ip6 = ipv6_hdr(skb)->daddr;
172 break;
173 #endif
174 default:
175 return NULL;
176 }
177
178 return br_mdb_ip_get(mdb, &ip);
179 }
180
181 static void br_mdb_free(struct rcu_head *head)
182 {
183 struct net_bridge_mdb_htable *mdb =
184 container_of(head, struct net_bridge_mdb_htable, rcu);
185 struct net_bridge_mdb_htable *old = mdb->old;
186
187 mdb->old = NULL;
188 kfree(old->mhash);
189 kfree(old);
190 }
191
192 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
193 struct net_bridge_mdb_htable *old,
194 int elasticity)
195 {
196 struct net_bridge_mdb_entry *mp;
197 int maxlen;
198 int len;
199 int i;
200
201 for (i = 0; i < old->max; i++)
202 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
203 hlist_add_head(&mp->hlist[new->ver],
204 &new->mhash[br_ip_hash(new, &mp->addr)]);
205
206 if (!elasticity)
207 return 0;
208
209 maxlen = 0;
210 for (i = 0; i < new->max; i++) {
211 len = 0;
212 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
213 len++;
214 if (len > maxlen)
215 maxlen = len;
216 }
217
218 return maxlen > elasticity ? -EINVAL : 0;
219 }
220
221 void br_multicast_free_pg(struct rcu_head *head)
222 {
223 struct net_bridge_port_group *p =
224 container_of(head, struct net_bridge_port_group, rcu);
225
226 kfree(p);
227 }
228
229 static void br_multicast_free_group(struct rcu_head *head)
230 {
231 struct net_bridge_mdb_entry *mp =
232 container_of(head, struct net_bridge_mdb_entry, rcu);
233
234 kfree(mp);
235 }
236
237 static void br_multicast_group_expired(unsigned long data)
238 {
239 struct net_bridge_mdb_entry *mp = (void *)data;
240 struct net_bridge *br = mp->br;
241 struct net_bridge_mdb_htable *mdb;
242
243 spin_lock(&br->multicast_lock);
244 if (!netif_running(br->dev) || timer_pending(&mp->timer))
245 goto out;
246
247 mp->mglist = false;
248
249 if (mp->ports)
250 goto out;
251
252 mdb = mlock_dereference(br->mdb, br);
253
254 hlist_del_rcu(&mp->hlist[mdb->ver]);
255 mdb->size--;
256
257 call_rcu_bh(&mp->rcu, br_multicast_free_group);
258
259 out:
260 spin_unlock(&br->multicast_lock);
261 }
262
263 static void br_multicast_del_pg(struct net_bridge *br,
264 struct net_bridge_port_group *pg)
265 {
266 struct net_bridge_mdb_htable *mdb;
267 struct net_bridge_mdb_entry *mp;
268 struct net_bridge_port_group *p;
269 struct net_bridge_port_group __rcu **pp;
270
271 mdb = mlock_dereference(br->mdb, br);
272
273 mp = br_mdb_ip_get(mdb, &pg->addr);
274 if (WARN_ON(!mp))
275 return;
276
277 for (pp = &mp->ports;
278 (p = mlock_dereference(*pp, br)) != NULL;
279 pp = &p->next) {
280 if (p != pg)
281 continue;
282
283 rcu_assign_pointer(*pp, p->next);
284 hlist_del_init(&p->mglist);
285 del_timer(&p->timer);
286 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
287 p->flags);
288 call_rcu_bh(&p->rcu, br_multicast_free_pg);
289
290 if (!mp->ports && !mp->mglist &&
291 netif_running(br->dev))
292 mod_timer(&mp->timer, jiffies);
293
294 return;
295 }
296
297 WARN_ON(1);
298 }
299
300 static void br_multicast_port_group_expired(unsigned long data)
301 {
302 struct net_bridge_port_group *pg = (void *)data;
303 struct net_bridge *br = pg->port->br;
304
305 spin_lock(&br->multicast_lock);
306 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
307 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
308 goto out;
309
310 br_multicast_del_pg(br, pg);
311
312 out:
313 spin_unlock(&br->multicast_lock);
314 }
315
316 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
317 int elasticity)
318 {
319 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
320 struct net_bridge_mdb_htable *mdb;
321 int err;
322
323 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
324 if (!mdb)
325 return -ENOMEM;
326
327 mdb->max = max;
328 mdb->old = old;
329
330 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
331 if (!mdb->mhash) {
332 kfree(mdb);
333 return -ENOMEM;
334 }
335
336 mdb->size = old ? old->size : 0;
337 mdb->ver = old ? old->ver ^ 1 : 0;
338
339 if (!old || elasticity)
340 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
341 else
342 mdb->secret = old->secret;
343
344 if (!old)
345 goto out;
346
347 err = br_mdb_copy(mdb, old, elasticity);
348 if (err) {
349 kfree(mdb->mhash);
350 kfree(mdb);
351 return err;
352 }
353
354 br_mdb_rehash_seq++;
355 call_rcu_bh(&mdb->rcu, br_mdb_free);
356
357 out:
358 rcu_assign_pointer(*mdbp, mdb);
359
360 return 0;
361 }
362
363 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
364 __be32 group,
365 u8 *igmp_type)
366 {
367 struct sk_buff *skb;
368 struct igmphdr *ih;
369 struct ethhdr *eth;
370 struct iphdr *iph;
371
372 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
373 sizeof(*ih) + 4);
374 if (!skb)
375 goto out;
376
377 skb->protocol = htons(ETH_P_IP);
378
379 skb_reset_mac_header(skb);
380 eth = eth_hdr(skb);
381
382 ether_addr_copy(eth->h_source, br->dev->dev_addr);
383 eth->h_dest[0] = 1;
384 eth->h_dest[1] = 0;
385 eth->h_dest[2] = 0x5e;
386 eth->h_dest[3] = 0;
387 eth->h_dest[4] = 0;
388 eth->h_dest[5] = 1;
389 eth->h_proto = htons(ETH_P_IP);
390 skb_put(skb, sizeof(*eth));
391
392 skb_set_network_header(skb, skb->len);
393 iph = ip_hdr(skb);
394
395 iph->version = 4;
396 iph->ihl = 6;
397 iph->tos = 0xc0;
398 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
399 iph->id = 0;
400 iph->frag_off = htons(IP_DF);
401 iph->ttl = 1;
402 iph->protocol = IPPROTO_IGMP;
403 iph->saddr = br->multicast_query_use_ifaddr ?
404 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
405 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
406 ((u8 *)&iph[1])[0] = IPOPT_RA;
407 ((u8 *)&iph[1])[1] = 4;
408 ((u8 *)&iph[1])[2] = 0;
409 ((u8 *)&iph[1])[3] = 0;
410 ip_send_check(iph);
411 skb_put(skb, 24);
412
413 skb_set_transport_header(skb, skb->len);
414 ih = igmp_hdr(skb);
415 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
416 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
417 ih->code = (group ? br->multicast_last_member_interval :
418 br->multicast_query_response_interval) /
419 (HZ / IGMP_TIMER_SCALE);
420 ih->group = group;
421 ih->csum = 0;
422 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
423 skb_put(skb, sizeof(*ih));
424
425 __skb_pull(skb, sizeof(*eth));
426
427 out:
428 return skb;
429 }
430
431 #if IS_ENABLED(CONFIG_IPV6)
432 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
433 const struct in6_addr *grp,
434 u8 *igmp_type)
435 {
436 struct sk_buff *skb;
437 struct ipv6hdr *ip6h;
438 struct mld_msg *mldq;
439 struct ethhdr *eth;
440 u8 *hopopt;
441 unsigned long interval;
442
443 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
444 8 + sizeof(*mldq));
445 if (!skb)
446 goto out;
447
448 skb->protocol = htons(ETH_P_IPV6);
449
450 /* Ethernet header */
451 skb_reset_mac_header(skb);
452 eth = eth_hdr(skb);
453
454 ether_addr_copy(eth->h_source, br->dev->dev_addr);
455 eth->h_proto = htons(ETH_P_IPV6);
456 skb_put(skb, sizeof(*eth));
457
458 /* IPv6 header + HbH option */
459 skb_set_network_header(skb, skb->len);
460 ip6h = ipv6_hdr(skb);
461
462 *(__force __be32 *)ip6h = htonl(0x60000000);
463 ip6h->payload_len = htons(8 + sizeof(*mldq));
464 ip6h->nexthdr = IPPROTO_HOPOPTS;
465 ip6h->hop_limit = 1;
466 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
467 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
468 &ip6h->saddr)) {
469 kfree_skb(skb);
470 br->has_ipv6_addr = 0;
471 return NULL;
472 }
473
474 br->has_ipv6_addr = 1;
475 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
476
477 hopopt = (u8 *)(ip6h + 1);
478 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
479 hopopt[1] = 0; /* length of HbH */
480 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
481 hopopt[3] = 2; /* Length of RA Option */
482 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
483 hopopt[5] = 0;
484 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
485 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
486
487 skb_put(skb, sizeof(*ip6h) + 8);
488
489 /* ICMPv6 */
490 skb_set_transport_header(skb, skb->len);
491 mldq = (struct mld_msg *) icmp6_hdr(skb);
492
493 interval = ipv6_addr_any(grp) ?
494 br->multicast_query_response_interval :
495 br->multicast_last_member_interval;
496
497 *igmp_type = ICMPV6_MGM_QUERY;
498 mldq->mld_type = ICMPV6_MGM_QUERY;
499 mldq->mld_code = 0;
500 mldq->mld_cksum = 0;
501 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
502 mldq->mld_reserved = 0;
503 mldq->mld_mca = *grp;
504
505 /* checksum */
506 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
507 sizeof(*mldq), IPPROTO_ICMPV6,
508 csum_partial(mldq,
509 sizeof(*mldq), 0));
510 skb_put(skb, sizeof(*mldq));
511
512 __skb_pull(skb, sizeof(*eth));
513
514 out:
515 return skb;
516 }
517 #endif
518
519 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
520 struct br_ip *addr,
521 u8 *igmp_type)
522 {
523 switch (addr->proto) {
524 case htons(ETH_P_IP):
525 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
526 #if IS_ENABLED(CONFIG_IPV6)
527 case htons(ETH_P_IPV6):
528 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
529 igmp_type);
530 #endif
531 }
532 return NULL;
533 }
534
535 static struct net_bridge_mdb_entry *br_multicast_get_group(
536 struct net_bridge *br, struct net_bridge_port *port,
537 struct br_ip *group, int hash)
538 {
539 struct net_bridge_mdb_htable *mdb;
540 struct net_bridge_mdb_entry *mp;
541 unsigned int count = 0;
542 unsigned int max;
543 int elasticity;
544 int err;
545
546 mdb = rcu_dereference_protected(br->mdb, 1);
547 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
548 count++;
549 if (unlikely(br_ip_equal(group, &mp->addr)))
550 return mp;
551 }
552
553 elasticity = 0;
554 max = mdb->max;
555
556 if (unlikely(count > br->hash_elasticity && count)) {
557 if (net_ratelimit())
558 br_info(br, "Multicast hash table "
559 "chain limit reached: %s\n",
560 port ? port->dev->name : br->dev->name);
561
562 elasticity = br->hash_elasticity;
563 }
564
565 if (mdb->size >= max) {
566 max *= 2;
567 if (unlikely(max > br->hash_max)) {
568 br_warn(br, "Multicast hash table maximum of %d "
569 "reached, disabling snooping: %s\n",
570 br->hash_max,
571 port ? port->dev->name : br->dev->name);
572 err = -E2BIG;
573 disable:
574 br->multicast_disabled = 1;
575 goto err;
576 }
577 }
578
579 if (max > mdb->max || elasticity) {
580 if (mdb->old) {
581 if (net_ratelimit())
582 br_info(br, "Multicast hash table "
583 "on fire: %s\n",
584 port ? port->dev->name : br->dev->name);
585 err = -EEXIST;
586 goto err;
587 }
588
589 err = br_mdb_rehash(&br->mdb, max, elasticity);
590 if (err) {
591 br_warn(br, "Cannot rehash multicast "
592 "hash table, disabling snooping: %s, %d, %d\n",
593 port ? port->dev->name : br->dev->name,
594 mdb->size, err);
595 goto disable;
596 }
597
598 err = -EAGAIN;
599 goto err;
600 }
601
602 return NULL;
603
604 err:
605 mp = ERR_PTR(err);
606 return mp;
607 }
608
609 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
610 struct net_bridge_port *port, struct br_ip *group)
611 {
612 struct net_bridge_mdb_htable *mdb;
613 struct net_bridge_mdb_entry *mp;
614 int hash;
615 int err;
616
617 mdb = rcu_dereference_protected(br->mdb, 1);
618 if (!mdb) {
619 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
620 if (err)
621 return ERR_PTR(err);
622 goto rehash;
623 }
624
625 hash = br_ip_hash(mdb, group);
626 mp = br_multicast_get_group(br, port, group, hash);
627 switch (PTR_ERR(mp)) {
628 case 0:
629 break;
630
631 case -EAGAIN:
632 rehash:
633 mdb = rcu_dereference_protected(br->mdb, 1);
634 hash = br_ip_hash(mdb, group);
635 break;
636
637 default:
638 goto out;
639 }
640
641 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
642 if (unlikely(!mp))
643 return ERR_PTR(-ENOMEM);
644
645 mp->br = br;
646 mp->addr = *group;
647 setup_timer(&mp->timer, br_multicast_group_expired,
648 (unsigned long)mp);
649
650 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
651 mdb->size++;
652
653 out:
654 return mp;
655 }
656
657 struct net_bridge_port_group *br_multicast_new_port_group(
658 struct net_bridge_port *port,
659 struct br_ip *group,
660 struct net_bridge_port_group __rcu *next,
661 unsigned char flags)
662 {
663 struct net_bridge_port_group *p;
664
665 p = kzalloc(sizeof(*p), GFP_ATOMIC);
666 if (unlikely(!p))
667 return NULL;
668
669 p->addr = *group;
670 p->port = port;
671 p->flags = flags;
672 rcu_assign_pointer(p->next, next);
673 hlist_add_head(&p->mglist, &port->mglist);
674 setup_timer(&p->timer, br_multicast_port_group_expired,
675 (unsigned long)p);
676 return p;
677 }
678
679 static int br_multicast_add_group(struct net_bridge *br,
680 struct net_bridge_port *port,
681 struct br_ip *group)
682 {
683 struct net_bridge_mdb_entry *mp;
684 struct net_bridge_port_group *p;
685 struct net_bridge_port_group __rcu **pp;
686 unsigned long now = jiffies;
687 int err;
688
689 spin_lock(&br->multicast_lock);
690 if (!netif_running(br->dev) ||
691 (port && port->state == BR_STATE_DISABLED))
692 goto out;
693
694 mp = br_multicast_new_group(br, port, group);
695 err = PTR_ERR(mp);
696 if (IS_ERR(mp))
697 goto err;
698
699 if (!port) {
700 mp->mglist = true;
701 mod_timer(&mp->timer, now + br->multicast_membership_interval);
702 goto out;
703 }
704
705 for (pp = &mp->ports;
706 (p = mlock_dereference(*pp, br)) != NULL;
707 pp = &p->next) {
708 if (p->port == port)
709 goto found;
710 if ((unsigned long)p->port < (unsigned long)port)
711 break;
712 }
713
714 p = br_multicast_new_port_group(port, group, *pp, 0);
715 if (unlikely(!p))
716 goto err;
717 rcu_assign_pointer(*pp, p);
718 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
719
720 found:
721 mod_timer(&p->timer, now + br->multicast_membership_interval);
722 out:
723 err = 0;
724
725 err:
726 spin_unlock(&br->multicast_lock);
727 return err;
728 }
729
730 static int br_ip4_multicast_add_group(struct net_bridge *br,
731 struct net_bridge_port *port,
732 __be32 group,
733 __u16 vid)
734 {
735 struct br_ip br_group;
736
737 if (ipv4_is_local_multicast(group))
738 return 0;
739
740 br_group.u.ip4 = group;
741 br_group.proto = htons(ETH_P_IP);
742 br_group.vid = vid;
743
744 return br_multicast_add_group(br, port, &br_group);
745 }
746
747 #if IS_ENABLED(CONFIG_IPV6)
748 static int br_ip6_multicast_add_group(struct net_bridge *br,
749 struct net_bridge_port *port,
750 const struct in6_addr *group,
751 __u16 vid)
752 {
753 struct br_ip br_group;
754
755 if (ipv6_addr_is_ll_all_nodes(group))
756 return 0;
757
758 br_group.u.ip6 = *group;
759 br_group.proto = htons(ETH_P_IPV6);
760 br_group.vid = vid;
761
762 return br_multicast_add_group(br, port, &br_group);
763 }
764 #endif
765
766 static void br_multicast_router_expired(unsigned long data)
767 {
768 struct net_bridge_port *port = (void *)data;
769 struct net_bridge *br = port->br;
770
771 spin_lock(&br->multicast_lock);
772 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
773 port->multicast_router == MDB_RTR_TYPE_PERM ||
774 timer_pending(&port->multicast_router_timer) ||
775 hlist_unhashed(&port->rlist))
776 goto out;
777
778 hlist_del_init_rcu(&port->rlist);
779 br_rtr_notify(br->dev, port, RTM_DELMDB);
780 /* Don't allow timer refresh if the router expired */
781 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
782 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
783
784 out:
785 spin_unlock(&br->multicast_lock);
786 }
787
788 static void br_multicast_local_router_expired(unsigned long data)
789 {
790 }
791
792 static void br_multicast_querier_expired(struct net_bridge *br,
793 struct bridge_mcast_own_query *query)
794 {
795 spin_lock(&br->multicast_lock);
796 if (!netif_running(br->dev) || br->multicast_disabled)
797 goto out;
798
799 br_multicast_start_querier(br, query);
800
801 out:
802 spin_unlock(&br->multicast_lock);
803 }
804
805 static void br_ip4_multicast_querier_expired(unsigned long data)
806 {
807 struct net_bridge *br = (void *)data;
808
809 br_multicast_querier_expired(br, &br->ip4_own_query);
810 }
811
812 #if IS_ENABLED(CONFIG_IPV6)
813 static void br_ip6_multicast_querier_expired(unsigned long data)
814 {
815 struct net_bridge *br = (void *)data;
816
817 br_multicast_querier_expired(br, &br->ip6_own_query);
818 }
819 #endif
820
821 static void br_multicast_select_own_querier(struct net_bridge *br,
822 struct br_ip *ip,
823 struct sk_buff *skb)
824 {
825 if (ip->proto == htons(ETH_P_IP))
826 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
827 #if IS_ENABLED(CONFIG_IPV6)
828 else
829 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
830 #endif
831 }
832
833 static void __br_multicast_send_query(struct net_bridge *br,
834 struct net_bridge_port *port,
835 struct br_ip *ip)
836 {
837 struct sk_buff *skb;
838 u8 igmp_type;
839
840 skb = br_multicast_alloc_query(br, ip, &igmp_type);
841 if (!skb)
842 return;
843
844 if (port) {
845 skb->dev = port->dev;
846 br_multicast_count(br, port, skb, igmp_type,
847 BR_MCAST_DIR_TX);
848 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
849 dev_net(port->dev), NULL, skb, NULL, skb->dev,
850 br_dev_queue_push_xmit);
851 } else {
852 br_multicast_select_own_querier(br, ip, skb);
853 br_multicast_count(br, port, skb, igmp_type,
854 BR_MCAST_DIR_RX);
855 netif_rx(skb);
856 }
857 }
858
859 static void br_multicast_send_query(struct net_bridge *br,
860 struct net_bridge_port *port,
861 struct bridge_mcast_own_query *own_query)
862 {
863 unsigned long time;
864 struct br_ip br_group;
865 struct bridge_mcast_other_query *other_query = NULL;
866
867 if (!netif_running(br->dev) || br->multicast_disabled ||
868 !br->multicast_querier)
869 return;
870
871 memset(&br_group.u, 0, sizeof(br_group.u));
872
873 if (port ? (own_query == &port->ip4_own_query) :
874 (own_query == &br->ip4_own_query)) {
875 other_query = &br->ip4_other_query;
876 br_group.proto = htons(ETH_P_IP);
877 #if IS_ENABLED(CONFIG_IPV6)
878 } else {
879 other_query = &br->ip6_other_query;
880 br_group.proto = htons(ETH_P_IPV6);
881 #endif
882 }
883
884 if (!other_query || timer_pending(&other_query->timer))
885 return;
886
887 __br_multicast_send_query(br, port, &br_group);
888
889 time = jiffies;
890 time += own_query->startup_sent < br->multicast_startup_query_count ?
891 br->multicast_startup_query_interval :
892 br->multicast_query_interval;
893 mod_timer(&own_query->timer, time);
894 }
895
896 static void
897 br_multicast_port_query_expired(struct net_bridge_port *port,
898 struct bridge_mcast_own_query *query)
899 {
900 struct net_bridge *br = port->br;
901
902 spin_lock(&br->multicast_lock);
903 if (port->state == BR_STATE_DISABLED ||
904 port->state == BR_STATE_BLOCKING)
905 goto out;
906
907 if (query->startup_sent < br->multicast_startup_query_count)
908 query->startup_sent++;
909
910 br_multicast_send_query(port->br, port, query);
911
912 out:
913 spin_unlock(&br->multicast_lock);
914 }
915
916 static void br_ip4_multicast_port_query_expired(unsigned long data)
917 {
918 struct net_bridge_port *port = (void *)data;
919
920 br_multicast_port_query_expired(port, &port->ip4_own_query);
921 }
922
923 #if IS_ENABLED(CONFIG_IPV6)
924 static void br_ip6_multicast_port_query_expired(unsigned long data)
925 {
926 struct net_bridge_port *port = (void *)data;
927
928 br_multicast_port_query_expired(port, &port->ip6_own_query);
929 }
930 #endif
931
932 int br_multicast_add_port(struct net_bridge_port *port)
933 {
934 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
935
936 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
937 (unsigned long)port);
938 setup_timer(&port->ip4_own_query.timer,
939 br_ip4_multicast_port_query_expired, (unsigned long)port);
940 #if IS_ENABLED(CONFIG_IPV6)
941 setup_timer(&port->ip6_own_query.timer,
942 br_ip6_multicast_port_query_expired, (unsigned long)port);
943 #endif
944 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
945 if (!port->mcast_stats)
946 return -ENOMEM;
947
948 return 0;
949 }
950
951 void br_multicast_del_port(struct net_bridge_port *port)
952 {
953 struct net_bridge *br = port->br;
954 struct net_bridge_port_group *pg;
955 struct hlist_node *n;
956
957 /* Take care of the remaining groups, only perm ones should be left */
958 spin_lock_bh(&br->multicast_lock);
959 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
960 br_multicast_del_pg(br, pg);
961 spin_unlock_bh(&br->multicast_lock);
962 del_timer_sync(&port->multicast_router_timer);
963 free_percpu(port->mcast_stats);
964 }
965
966 static void br_multicast_enable(struct bridge_mcast_own_query *query)
967 {
968 query->startup_sent = 0;
969
970 if (try_to_del_timer_sync(&query->timer) >= 0 ||
971 del_timer(&query->timer))
972 mod_timer(&query->timer, jiffies);
973 }
974
975 void br_multicast_enable_port(struct net_bridge_port *port)
976 {
977 struct net_bridge *br = port->br;
978
979 spin_lock(&br->multicast_lock);
980 if (br->multicast_disabled || !netif_running(br->dev))
981 goto out;
982
983 br_multicast_enable(&port->ip4_own_query);
984 #if IS_ENABLED(CONFIG_IPV6)
985 br_multicast_enable(&port->ip6_own_query);
986 #endif
987 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
988 hlist_unhashed(&port->rlist))
989 br_multicast_add_router(br, port);
990
991 out:
992 spin_unlock(&br->multicast_lock);
993 }
994
995 void br_multicast_disable_port(struct net_bridge_port *port)
996 {
997 struct net_bridge *br = port->br;
998 struct net_bridge_port_group *pg;
999 struct hlist_node *n;
1000
1001 spin_lock(&br->multicast_lock);
1002 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1003 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1004 br_multicast_del_pg(br, pg);
1005
1006 if (!hlist_unhashed(&port->rlist)) {
1007 hlist_del_init_rcu(&port->rlist);
1008 br_rtr_notify(br->dev, port, RTM_DELMDB);
1009 /* Don't allow timer refresh if disabling */
1010 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
1011 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1012 }
1013 del_timer(&port->multicast_router_timer);
1014 del_timer(&port->ip4_own_query.timer);
1015 #if IS_ENABLED(CONFIG_IPV6)
1016 del_timer(&port->ip6_own_query.timer);
1017 #endif
1018 spin_unlock(&br->multicast_lock);
1019 }
1020
1021 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1022 struct net_bridge_port *port,
1023 struct sk_buff *skb,
1024 u16 vid)
1025 {
1026 struct igmpv3_report *ih;
1027 struct igmpv3_grec *grec;
1028 int i;
1029 int len;
1030 int num;
1031 int type;
1032 int err = 0;
1033 __be32 group;
1034
1035 ih = igmpv3_report_hdr(skb);
1036 num = ntohs(ih->ngrec);
1037 len = skb_transport_offset(skb) + sizeof(*ih);
1038
1039 for (i = 0; i < num; i++) {
1040 len += sizeof(*grec);
1041 if (!pskb_may_pull(skb, len))
1042 return -EINVAL;
1043
1044 grec = (void *)(skb->data + len - sizeof(*grec));
1045 group = grec->grec_mca;
1046 type = grec->grec_type;
1047
1048 len += ntohs(grec->grec_nsrcs) * 4;
1049 if (!pskb_may_pull(skb, len))
1050 return -EINVAL;
1051
1052 /* We treat this as an IGMPv2 report for now. */
1053 switch (type) {
1054 case IGMPV3_MODE_IS_INCLUDE:
1055 case IGMPV3_MODE_IS_EXCLUDE:
1056 case IGMPV3_CHANGE_TO_INCLUDE:
1057 case IGMPV3_CHANGE_TO_EXCLUDE:
1058 case IGMPV3_ALLOW_NEW_SOURCES:
1059 case IGMPV3_BLOCK_OLD_SOURCES:
1060 break;
1061
1062 default:
1063 continue;
1064 }
1065
1066 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1067 type == IGMPV3_MODE_IS_INCLUDE) &&
1068 ntohs(grec->grec_nsrcs) == 0) {
1069 br_ip4_multicast_leave_group(br, port, group, vid);
1070 } else {
1071 err = br_ip4_multicast_add_group(br, port, group, vid);
1072 if (err)
1073 break;
1074 }
1075 }
1076
1077 return err;
1078 }
1079
1080 #if IS_ENABLED(CONFIG_IPV6)
1081 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1082 struct net_bridge_port *port,
1083 struct sk_buff *skb,
1084 u16 vid)
1085 {
1086 struct icmp6hdr *icmp6h;
1087 struct mld2_grec *grec;
1088 int i;
1089 int len;
1090 int num;
1091 int err = 0;
1092
1093 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1094 return -EINVAL;
1095
1096 icmp6h = icmp6_hdr(skb);
1097 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1098 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1099
1100 for (i = 0; i < num; i++) {
1101 __be16 *nsrcs, _nsrcs;
1102
1103 nsrcs = skb_header_pointer(skb,
1104 len + offsetof(struct mld2_grec,
1105 grec_nsrcs),
1106 sizeof(_nsrcs), &_nsrcs);
1107 if (!nsrcs)
1108 return -EINVAL;
1109
1110 if (!pskb_may_pull(skb,
1111 len + sizeof(*grec) +
1112 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1113 return -EINVAL;
1114
1115 grec = (struct mld2_grec *)(skb->data + len);
1116 len += sizeof(*grec) +
1117 sizeof(struct in6_addr) * ntohs(*nsrcs);
1118
1119 /* We treat these as MLDv1 reports for now. */
1120 switch (grec->grec_type) {
1121 case MLD2_MODE_IS_INCLUDE:
1122 case MLD2_MODE_IS_EXCLUDE:
1123 case MLD2_CHANGE_TO_INCLUDE:
1124 case MLD2_CHANGE_TO_EXCLUDE:
1125 case MLD2_ALLOW_NEW_SOURCES:
1126 case MLD2_BLOCK_OLD_SOURCES:
1127 break;
1128
1129 default:
1130 continue;
1131 }
1132
1133 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1134 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1135 ntohs(*nsrcs) == 0) {
1136 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1137 vid);
1138 } else {
1139 err = br_ip6_multicast_add_group(br, port,
1140 &grec->grec_mca, vid);
1141 if (err)
1142 break;
1143 }
1144 }
1145
1146 return err;
1147 }
1148 #endif
1149
1150 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1151 struct net_bridge_port *port,
1152 __be32 saddr)
1153 {
1154 if (!timer_pending(&br->ip4_own_query.timer) &&
1155 !timer_pending(&br->ip4_other_query.timer))
1156 goto update;
1157
1158 if (!br->ip4_querier.addr.u.ip4)
1159 goto update;
1160
1161 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1162 goto update;
1163
1164 return false;
1165
1166 update:
1167 br->ip4_querier.addr.u.ip4 = saddr;
1168
1169 /* update protected by general multicast_lock by caller */
1170 rcu_assign_pointer(br->ip4_querier.port, port);
1171
1172 return true;
1173 }
1174
1175 #if IS_ENABLED(CONFIG_IPV6)
1176 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1177 struct net_bridge_port *port,
1178 struct in6_addr *saddr)
1179 {
1180 if (!timer_pending(&br->ip6_own_query.timer) &&
1181 !timer_pending(&br->ip6_other_query.timer))
1182 goto update;
1183
1184 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1185 goto update;
1186
1187 return false;
1188
1189 update:
1190 br->ip6_querier.addr.u.ip6 = *saddr;
1191
1192 /* update protected by general multicast_lock by caller */
1193 rcu_assign_pointer(br->ip6_querier.port, port);
1194
1195 return true;
1196 }
1197 #endif
1198
1199 static bool br_multicast_select_querier(struct net_bridge *br,
1200 struct net_bridge_port *port,
1201 struct br_ip *saddr)
1202 {
1203 switch (saddr->proto) {
1204 case htons(ETH_P_IP):
1205 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1206 #if IS_ENABLED(CONFIG_IPV6)
1207 case htons(ETH_P_IPV6):
1208 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1209 #endif
1210 }
1211
1212 return false;
1213 }
1214
1215 static void
1216 br_multicast_update_query_timer(struct net_bridge *br,
1217 struct bridge_mcast_other_query *query,
1218 unsigned long max_delay)
1219 {
1220 if (!timer_pending(&query->timer))
1221 query->delay_time = jiffies + max_delay;
1222
1223 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1224 }
1225
1226 /*
1227 * Add port to router_list
1228 * list is maintained ordered by pointer value
1229 * and locked by br->multicast_lock and RCU
1230 */
1231 static void br_multicast_add_router(struct net_bridge *br,
1232 struct net_bridge_port *port)
1233 {
1234 struct net_bridge_port *p;
1235 struct hlist_node *slot = NULL;
1236
1237 if (!hlist_unhashed(&port->rlist))
1238 return;
1239
1240 hlist_for_each_entry(p, &br->router_list, rlist) {
1241 if ((unsigned long) port >= (unsigned long) p)
1242 break;
1243 slot = &p->rlist;
1244 }
1245
1246 if (slot)
1247 hlist_add_behind_rcu(&port->rlist, slot);
1248 else
1249 hlist_add_head_rcu(&port->rlist, &br->router_list);
1250 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1251 }
1252
1253 static void br_multicast_mark_router(struct net_bridge *br,
1254 struct net_bridge_port *port)
1255 {
1256 unsigned long now = jiffies;
1257
1258 if (!port) {
1259 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1260 mod_timer(&br->multicast_router_timer,
1261 now + br->multicast_querier_interval);
1262 return;
1263 }
1264
1265 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1266 port->multicast_router == MDB_RTR_TYPE_PERM)
1267 return;
1268
1269 br_multicast_add_router(br, port);
1270
1271 mod_timer(&port->multicast_router_timer,
1272 now + br->multicast_querier_interval);
1273 }
1274
1275 static void br_multicast_query_received(struct net_bridge *br,
1276 struct net_bridge_port *port,
1277 struct bridge_mcast_other_query *query,
1278 struct br_ip *saddr,
1279 unsigned long max_delay)
1280 {
1281 if (!br_multicast_select_querier(br, port, saddr))
1282 return;
1283
1284 br_multicast_update_query_timer(br, query, max_delay);
1285 br_multicast_mark_router(br, port);
1286 }
1287
1288 static int br_ip4_multicast_query(struct net_bridge *br,
1289 struct net_bridge_port *port,
1290 struct sk_buff *skb,
1291 u16 vid)
1292 {
1293 const struct iphdr *iph = ip_hdr(skb);
1294 struct igmphdr *ih = igmp_hdr(skb);
1295 struct net_bridge_mdb_entry *mp;
1296 struct igmpv3_query *ih3;
1297 struct net_bridge_port_group *p;
1298 struct net_bridge_port_group __rcu **pp;
1299 struct br_ip saddr;
1300 unsigned long max_delay;
1301 unsigned long now = jiffies;
1302 unsigned int offset = skb_transport_offset(skb);
1303 __be32 group;
1304 int err = 0;
1305
1306 spin_lock(&br->multicast_lock);
1307 if (!netif_running(br->dev) ||
1308 (port && port->state == BR_STATE_DISABLED))
1309 goto out;
1310
1311 group = ih->group;
1312
1313 if (skb->len == offset + sizeof(*ih)) {
1314 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1315
1316 if (!max_delay) {
1317 max_delay = 10 * HZ;
1318 group = 0;
1319 }
1320 } else if (skb->len >= offset + sizeof(*ih3)) {
1321 ih3 = igmpv3_query_hdr(skb);
1322 if (ih3->nsrcs)
1323 goto out;
1324
1325 max_delay = ih3->code ?
1326 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1327 } else {
1328 goto out;
1329 }
1330
1331 if (!group) {
1332 saddr.proto = htons(ETH_P_IP);
1333 saddr.u.ip4 = iph->saddr;
1334
1335 br_multicast_query_received(br, port, &br->ip4_other_query,
1336 &saddr, max_delay);
1337 goto out;
1338 }
1339
1340 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1341 if (!mp)
1342 goto out;
1343
1344 max_delay *= br->multicast_last_member_count;
1345
1346 if (mp->mglist &&
1347 (timer_pending(&mp->timer) ?
1348 time_after(mp->timer.expires, now + max_delay) :
1349 try_to_del_timer_sync(&mp->timer) >= 0))
1350 mod_timer(&mp->timer, now + max_delay);
1351
1352 for (pp = &mp->ports;
1353 (p = mlock_dereference(*pp, br)) != NULL;
1354 pp = &p->next) {
1355 if (timer_pending(&p->timer) ?
1356 time_after(p->timer.expires, now + max_delay) :
1357 try_to_del_timer_sync(&p->timer) >= 0)
1358 mod_timer(&p->timer, now + max_delay);
1359 }
1360
1361 out:
1362 spin_unlock(&br->multicast_lock);
1363 return err;
1364 }
1365
1366 #if IS_ENABLED(CONFIG_IPV6)
1367 static int br_ip6_multicast_query(struct net_bridge *br,
1368 struct net_bridge_port *port,
1369 struct sk_buff *skb,
1370 u16 vid)
1371 {
1372 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1373 struct mld_msg *mld;
1374 struct net_bridge_mdb_entry *mp;
1375 struct mld2_query *mld2q;
1376 struct net_bridge_port_group *p;
1377 struct net_bridge_port_group __rcu **pp;
1378 struct br_ip saddr;
1379 unsigned long max_delay;
1380 unsigned long now = jiffies;
1381 unsigned int offset = skb_transport_offset(skb);
1382 const struct in6_addr *group = NULL;
1383 bool is_general_query;
1384 int err = 0;
1385
1386 spin_lock(&br->multicast_lock);
1387 if (!netif_running(br->dev) ||
1388 (port && port->state == BR_STATE_DISABLED))
1389 goto out;
1390
1391 if (skb->len == offset + sizeof(*mld)) {
1392 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1393 err = -EINVAL;
1394 goto out;
1395 }
1396 mld = (struct mld_msg *) icmp6_hdr(skb);
1397 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1398 if (max_delay)
1399 group = &mld->mld_mca;
1400 } else {
1401 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1402 err = -EINVAL;
1403 goto out;
1404 }
1405 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1406 if (!mld2q->mld2q_nsrcs)
1407 group = &mld2q->mld2q_mca;
1408
1409 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1410 }
1411
1412 is_general_query = group && ipv6_addr_any(group);
1413
1414 if (is_general_query) {
1415 saddr.proto = htons(ETH_P_IPV6);
1416 saddr.u.ip6 = ip6h->saddr;
1417
1418 br_multicast_query_received(br, port, &br->ip6_other_query,
1419 &saddr, max_delay);
1420 goto out;
1421 } else if (!group) {
1422 goto out;
1423 }
1424
1425 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1426 if (!mp)
1427 goto out;
1428
1429 max_delay *= br->multicast_last_member_count;
1430 if (mp->mglist &&
1431 (timer_pending(&mp->timer) ?
1432 time_after(mp->timer.expires, now + max_delay) :
1433 try_to_del_timer_sync(&mp->timer) >= 0))
1434 mod_timer(&mp->timer, now + max_delay);
1435
1436 for (pp = &mp->ports;
1437 (p = mlock_dereference(*pp, br)) != NULL;
1438 pp = &p->next) {
1439 if (timer_pending(&p->timer) ?
1440 time_after(p->timer.expires, now + max_delay) :
1441 try_to_del_timer_sync(&p->timer) >= 0)
1442 mod_timer(&p->timer, now + max_delay);
1443 }
1444
1445 out:
1446 spin_unlock(&br->multicast_lock);
1447 return err;
1448 }
1449 #endif
1450
1451 static void
1452 br_multicast_leave_group(struct net_bridge *br,
1453 struct net_bridge_port *port,
1454 struct br_ip *group,
1455 struct bridge_mcast_other_query *other_query,
1456 struct bridge_mcast_own_query *own_query)
1457 {
1458 struct net_bridge_mdb_htable *mdb;
1459 struct net_bridge_mdb_entry *mp;
1460 struct net_bridge_port_group *p;
1461 unsigned long now;
1462 unsigned long time;
1463
1464 spin_lock(&br->multicast_lock);
1465 if (!netif_running(br->dev) ||
1466 (port && port->state == BR_STATE_DISABLED))
1467 goto out;
1468
1469 mdb = mlock_dereference(br->mdb, br);
1470 mp = br_mdb_ip_get(mdb, group);
1471 if (!mp)
1472 goto out;
1473
1474 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1475 struct net_bridge_port_group __rcu **pp;
1476
1477 for (pp = &mp->ports;
1478 (p = mlock_dereference(*pp, br)) != NULL;
1479 pp = &p->next) {
1480 if (p->port != port)
1481 continue;
1482
1483 rcu_assign_pointer(*pp, p->next);
1484 hlist_del_init(&p->mglist);
1485 del_timer(&p->timer);
1486 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1487 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1488 p->flags);
1489
1490 if (!mp->ports && !mp->mglist &&
1491 netif_running(br->dev))
1492 mod_timer(&mp->timer, jiffies);
1493 }
1494 goto out;
1495 }
1496
1497 if (timer_pending(&other_query->timer))
1498 goto out;
1499
1500 if (br->multicast_querier) {
1501 __br_multicast_send_query(br, port, &mp->addr);
1502
1503 time = jiffies + br->multicast_last_member_count *
1504 br->multicast_last_member_interval;
1505
1506 mod_timer(&own_query->timer, time);
1507
1508 for (p = mlock_dereference(mp->ports, br);
1509 p != NULL;
1510 p = mlock_dereference(p->next, br)) {
1511 if (p->port != port)
1512 continue;
1513
1514 if (!hlist_unhashed(&p->mglist) &&
1515 (timer_pending(&p->timer) ?
1516 time_after(p->timer.expires, time) :
1517 try_to_del_timer_sync(&p->timer) >= 0)) {
1518 mod_timer(&p->timer, time);
1519 }
1520
1521 break;
1522 }
1523 }
1524
1525 now = jiffies;
1526 time = now + br->multicast_last_member_count *
1527 br->multicast_last_member_interval;
1528
1529 if (!port) {
1530 if (mp->mglist &&
1531 (timer_pending(&mp->timer) ?
1532 time_after(mp->timer.expires, time) :
1533 try_to_del_timer_sync(&mp->timer) >= 0)) {
1534 mod_timer(&mp->timer, time);
1535 }
1536
1537 goto out;
1538 }
1539
1540 for (p = mlock_dereference(mp->ports, br);
1541 p != NULL;
1542 p = mlock_dereference(p->next, br)) {
1543 if (p->port != port)
1544 continue;
1545
1546 if (!hlist_unhashed(&p->mglist) &&
1547 (timer_pending(&p->timer) ?
1548 time_after(p->timer.expires, time) :
1549 try_to_del_timer_sync(&p->timer) >= 0)) {
1550 mod_timer(&p->timer, time);
1551 }
1552
1553 break;
1554 }
1555 out:
1556 spin_unlock(&br->multicast_lock);
1557 }
1558
1559 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1560 struct net_bridge_port *port,
1561 __be32 group,
1562 __u16 vid)
1563 {
1564 struct br_ip br_group;
1565 struct bridge_mcast_own_query *own_query;
1566
1567 if (ipv4_is_local_multicast(group))
1568 return;
1569
1570 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1571
1572 br_group.u.ip4 = group;
1573 br_group.proto = htons(ETH_P_IP);
1574 br_group.vid = vid;
1575
1576 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1577 own_query);
1578 }
1579
1580 #if IS_ENABLED(CONFIG_IPV6)
1581 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1582 struct net_bridge_port *port,
1583 const struct in6_addr *group,
1584 __u16 vid)
1585 {
1586 struct br_ip br_group;
1587 struct bridge_mcast_own_query *own_query;
1588
1589 if (ipv6_addr_is_ll_all_nodes(group))
1590 return;
1591
1592 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1593
1594 br_group.u.ip6 = *group;
1595 br_group.proto = htons(ETH_P_IPV6);
1596 br_group.vid = vid;
1597
1598 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1599 own_query);
1600 }
1601 #endif
1602
1603 static void br_multicast_err_count(const struct net_bridge *br,
1604 const struct net_bridge_port *p,
1605 __be16 proto)
1606 {
1607 struct bridge_mcast_stats __percpu *stats;
1608 struct bridge_mcast_stats *pstats;
1609
1610 if (!br->multicast_stats_enabled)
1611 return;
1612
1613 if (p)
1614 stats = p->mcast_stats;
1615 else
1616 stats = br->mcast_stats;
1617 if (WARN_ON(!stats))
1618 return;
1619
1620 pstats = this_cpu_ptr(stats);
1621
1622 u64_stats_update_begin(&pstats->syncp);
1623 switch (proto) {
1624 case htons(ETH_P_IP):
1625 pstats->mstats.igmp_parse_errors++;
1626 break;
1627 #if IS_ENABLED(CONFIG_IPV6)
1628 case htons(ETH_P_IPV6):
1629 pstats->mstats.mld_parse_errors++;
1630 break;
1631 #endif
1632 }
1633 u64_stats_update_end(&pstats->syncp);
1634 }
1635
1636 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1637 struct net_bridge_port *port,
1638 struct sk_buff *skb,
1639 u16 vid)
1640 {
1641 struct sk_buff *skb_trimmed = NULL;
1642 struct igmphdr *ih;
1643 int err;
1644
1645 err = ip_mc_check_igmp(skb, &skb_trimmed);
1646
1647 if (err == -ENOMSG) {
1648 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1649 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1650 return 0;
1651 } else if (err < 0) {
1652 br_multicast_err_count(br, port, skb->protocol);
1653 return err;
1654 }
1655
1656 ih = igmp_hdr(skb);
1657 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1658
1659 switch (ih->type) {
1660 case IGMP_HOST_MEMBERSHIP_REPORT:
1661 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1662 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1663 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1664 break;
1665 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1666 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1667 break;
1668 case IGMP_HOST_MEMBERSHIP_QUERY:
1669 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1670 break;
1671 case IGMP_HOST_LEAVE_MESSAGE:
1672 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1673 break;
1674 }
1675
1676 if (skb_trimmed && skb_trimmed != skb)
1677 kfree_skb(skb_trimmed);
1678
1679 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1680 BR_MCAST_DIR_RX);
1681
1682 return err;
1683 }
1684
1685 #if IS_ENABLED(CONFIG_IPV6)
1686 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1687 struct net_bridge_port *port,
1688 struct sk_buff *skb,
1689 u16 vid)
1690 {
1691 struct sk_buff *skb_trimmed = NULL;
1692 struct mld_msg *mld;
1693 int err;
1694
1695 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1696
1697 if (err == -ENOMSG) {
1698 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1699 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1700 return 0;
1701 } else if (err < 0) {
1702 br_multicast_err_count(br, port, skb->protocol);
1703 return err;
1704 }
1705
1706 mld = (struct mld_msg *)skb_transport_header(skb);
1707 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1708
1709 switch (mld->mld_type) {
1710 case ICMPV6_MGM_REPORT:
1711 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1712 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1713 break;
1714 case ICMPV6_MLD2_REPORT:
1715 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1716 break;
1717 case ICMPV6_MGM_QUERY:
1718 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1719 break;
1720 case ICMPV6_MGM_REDUCTION:
1721 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1722 break;
1723 }
1724
1725 if (skb_trimmed && skb_trimmed != skb)
1726 kfree_skb(skb_trimmed);
1727
1728 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1729 BR_MCAST_DIR_RX);
1730
1731 return err;
1732 }
1733 #endif
1734
1735 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1736 struct sk_buff *skb, u16 vid)
1737 {
1738 int ret = 0;
1739
1740 BR_INPUT_SKB_CB(skb)->igmp = 0;
1741 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1742
1743 if (br->multicast_disabled)
1744 return 0;
1745
1746 switch (skb->protocol) {
1747 case htons(ETH_P_IP):
1748 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1749 break;
1750 #if IS_ENABLED(CONFIG_IPV6)
1751 case htons(ETH_P_IPV6):
1752 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1753 break;
1754 #endif
1755 }
1756
1757 return ret;
1758 }
1759
1760 static void br_multicast_query_expired(struct net_bridge *br,
1761 struct bridge_mcast_own_query *query,
1762 struct bridge_mcast_querier *querier)
1763 {
1764 spin_lock(&br->multicast_lock);
1765 if (query->startup_sent < br->multicast_startup_query_count)
1766 query->startup_sent++;
1767
1768 RCU_INIT_POINTER(querier->port, NULL);
1769 br_multicast_send_query(br, NULL, query);
1770 spin_unlock(&br->multicast_lock);
1771 }
1772
1773 static void br_ip4_multicast_query_expired(unsigned long data)
1774 {
1775 struct net_bridge *br = (void *)data;
1776
1777 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1778 }
1779
1780 #if IS_ENABLED(CONFIG_IPV6)
1781 static void br_ip6_multicast_query_expired(unsigned long data)
1782 {
1783 struct net_bridge *br = (void *)data;
1784
1785 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1786 }
1787 #endif
1788
1789 void br_multicast_init(struct net_bridge *br)
1790 {
1791 br->hash_elasticity = 4;
1792 br->hash_max = 512;
1793
1794 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1795 br->multicast_querier = 0;
1796 br->multicast_query_use_ifaddr = 0;
1797 br->multicast_last_member_count = 2;
1798 br->multicast_startup_query_count = 2;
1799
1800 br->multicast_last_member_interval = HZ;
1801 br->multicast_query_response_interval = 10 * HZ;
1802 br->multicast_startup_query_interval = 125 * HZ / 4;
1803 br->multicast_query_interval = 125 * HZ;
1804 br->multicast_querier_interval = 255 * HZ;
1805 br->multicast_membership_interval = 260 * HZ;
1806
1807 br->ip4_other_query.delay_time = 0;
1808 br->ip4_querier.port = NULL;
1809 #if IS_ENABLED(CONFIG_IPV6)
1810 br->ip6_other_query.delay_time = 0;
1811 br->ip6_querier.port = NULL;
1812 #endif
1813 br->has_ipv6_addr = 1;
1814
1815 spin_lock_init(&br->multicast_lock);
1816 setup_timer(&br->multicast_router_timer,
1817 br_multicast_local_router_expired, 0);
1818 setup_timer(&br->ip4_other_query.timer,
1819 br_ip4_multicast_querier_expired, (unsigned long)br);
1820 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1821 (unsigned long)br);
1822 #if IS_ENABLED(CONFIG_IPV6)
1823 setup_timer(&br->ip6_other_query.timer,
1824 br_ip6_multicast_querier_expired, (unsigned long)br);
1825 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1826 (unsigned long)br);
1827 #endif
1828 }
1829
1830 static void __br_multicast_open(struct net_bridge *br,
1831 struct bridge_mcast_own_query *query)
1832 {
1833 query->startup_sent = 0;
1834
1835 if (br->multicast_disabled)
1836 return;
1837
1838 mod_timer(&query->timer, jiffies);
1839 }
1840
1841 void br_multicast_open(struct net_bridge *br)
1842 {
1843 __br_multicast_open(br, &br->ip4_own_query);
1844 #if IS_ENABLED(CONFIG_IPV6)
1845 __br_multicast_open(br, &br->ip6_own_query);
1846 #endif
1847 }
1848
1849 void br_multicast_stop(struct net_bridge *br)
1850 {
1851 del_timer_sync(&br->multicast_router_timer);
1852 del_timer_sync(&br->ip4_other_query.timer);
1853 del_timer_sync(&br->ip4_own_query.timer);
1854 #if IS_ENABLED(CONFIG_IPV6)
1855 del_timer_sync(&br->ip6_other_query.timer);
1856 del_timer_sync(&br->ip6_own_query.timer);
1857 #endif
1858 }
1859
1860 void br_multicast_dev_del(struct net_bridge *br)
1861 {
1862 struct net_bridge_mdb_htable *mdb;
1863 struct net_bridge_mdb_entry *mp;
1864 struct hlist_node *n;
1865 u32 ver;
1866 int i;
1867
1868 spin_lock_bh(&br->multicast_lock);
1869 mdb = mlock_dereference(br->mdb, br);
1870 if (!mdb)
1871 goto out;
1872
1873 br->mdb = NULL;
1874
1875 ver = mdb->ver;
1876 for (i = 0; i < mdb->max; i++) {
1877 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1878 hlist[ver]) {
1879 del_timer(&mp->timer);
1880 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1881 }
1882 }
1883
1884 if (mdb->old) {
1885 spin_unlock_bh(&br->multicast_lock);
1886 rcu_barrier_bh();
1887 spin_lock_bh(&br->multicast_lock);
1888 WARN_ON(mdb->old);
1889 }
1890
1891 mdb->old = mdb;
1892 call_rcu_bh(&mdb->rcu, br_mdb_free);
1893
1894 out:
1895 spin_unlock_bh(&br->multicast_lock);
1896
1897 free_percpu(br->mcast_stats);
1898 }
1899
1900 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1901 {
1902 int err = -EINVAL;
1903
1904 spin_lock_bh(&br->multicast_lock);
1905
1906 switch (val) {
1907 case MDB_RTR_TYPE_DISABLED:
1908 case MDB_RTR_TYPE_PERM:
1909 del_timer(&br->multicast_router_timer);
1910 /* fall through */
1911 case MDB_RTR_TYPE_TEMP_QUERY:
1912 br->multicast_router = val;
1913 err = 0;
1914 break;
1915 }
1916
1917 spin_unlock_bh(&br->multicast_lock);
1918
1919 return err;
1920 }
1921
1922 static void __del_port_router(struct net_bridge_port *p)
1923 {
1924 if (hlist_unhashed(&p->rlist))
1925 return;
1926 hlist_del_init_rcu(&p->rlist);
1927 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1928 }
1929
1930 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1931 {
1932 struct net_bridge *br = p->br;
1933 unsigned long now = jiffies;
1934 int err = -EINVAL;
1935
1936 spin_lock(&br->multicast_lock);
1937 if (p->multicast_router == val) {
1938 /* Refresh the temp router port timer */
1939 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1940 mod_timer(&p->multicast_router_timer,
1941 now + br->multicast_querier_interval);
1942 err = 0;
1943 goto unlock;
1944 }
1945 switch (val) {
1946 case MDB_RTR_TYPE_DISABLED:
1947 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1948 __del_port_router(p);
1949 del_timer(&p->multicast_router_timer);
1950 break;
1951 case MDB_RTR_TYPE_TEMP_QUERY:
1952 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1953 __del_port_router(p);
1954 break;
1955 case MDB_RTR_TYPE_PERM:
1956 p->multicast_router = MDB_RTR_TYPE_PERM;
1957 del_timer(&p->multicast_router_timer);
1958 br_multicast_add_router(br, p);
1959 break;
1960 case MDB_RTR_TYPE_TEMP:
1961 p->multicast_router = MDB_RTR_TYPE_TEMP;
1962 br_multicast_mark_router(br, p);
1963 break;
1964 default:
1965 goto unlock;
1966 }
1967 err = 0;
1968 unlock:
1969 spin_unlock(&br->multicast_lock);
1970
1971 return err;
1972 }
1973
1974 static void br_multicast_start_querier(struct net_bridge *br,
1975 struct bridge_mcast_own_query *query)
1976 {
1977 struct net_bridge_port *port;
1978
1979 __br_multicast_open(br, query);
1980
1981 list_for_each_entry(port, &br->port_list, list) {
1982 if (port->state == BR_STATE_DISABLED ||
1983 port->state == BR_STATE_BLOCKING)
1984 continue;
1985
1986 if (query == &br->ip4_own_query)
1987 br_multicast_enable(&port->ip4_own_query);
1988 #if IS_ENABLED(CONFIG_IPV6)
1989 else
1990 br_multicast_enable(&port->ip6_own_query);
1991 #endif
1992 }
1993 }
1994
1995 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1996 {
1997 int err = 0;
1998 struct net_bridge_mdb_htable *mdb;
1999
2000 spin_lock_bh(&br->multicast_lock);
2001 if (br->multicast_disabled == !val)
2002 goto unlock;
2003
2004 br->multicast_disabled = !val;
2005 if (br->multicast_disabled)
2006 goto unlock;
2007
2008 if (!netif_running(br->dev))
2009 goto unlock;
2010
2011 mdb = mlock_dereference(br->mdb, br);
2012 if (mdb) {
2013 if (mdb->old) {
2014 err = -EEXIST;
2015 rollback:
2016 br->multicast_disabled = !!val;
2017 goto unlock;
2018 }
2019
2020 err = br_mdb_rehash(&br->mdb, mdb->max,
2021 br->hash_elasticity);
2022 if (err)
2023 goto rollback;
2024 }
2025
2026 br_multicast_start_querier(br, &br->ip4_own_query);
2027 #if IS_ENABLED(CONFIG_IPV6)
2028 br_multicast_start_querier(br, &br->ip6_own_query);
2029 #endif
2030
2031 unlock:
2032 spin_unlock_bh(&br->multicast_lock);
2033
2034 return err;
2035 }
2036
2037 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2038 {
2039 unsigned long max_delay;
2040
2041 val = !!val;
2042
2043 spin_lock_bh(&br->multicast_lock);
2044 if (br->multicast_querier == val)
2045 goto unlock;
2046
2047 br->multicast_querier = val;
2048 if (!val)
2049 goto unlock;
2050
2051 max_delay = br->multicast_query_response_interval;
2052
2053 if (!timer_pending(&br->ip4_other_query.timer))
2054 br->ip4_other_query.delay_time = jiffies + max_delay;
2055
2056 br_multicast_start_querier(br, &br->ip4_own_query);
2057
2058 #if IS_ENABLED(CONFIG_IPV6)
2059 if (!timer_pending(&br->ip6_other_query.timer))
2060 br->ip6_other_query.delay_time = jiffies + max_delay;
2061
2062 br_multicast_start_querier(br, &br->ip6_own_query);
2063 #endif
2064
2065 unlock:
2066 spin_unlock_bh(&br->multicast_lock);
2067
2068 return 0;
2069 }
2070
2071 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2072 {
2073 int err = -EINVAL;
2074 u32 old;
2075 struct net_bridge_mdb_htable *mdb;
2076
2077 spin_lock_bh(&br->multicast_lock);
2078 if (!is_power_of_2(val))
2079 goto unlock;
2080
2081 mdb = mlock_dereference(br->mdb, br);
2082 if (mdb && val < mdb->size)
2083 goto unlock;
2084
2085 err = 0;
2086
2087 old = br->hash_max;
2088 br->hash_max = val;
2089
2090 if (mdb) {
2091 if (mdb->old) {
2092 err = -EEXIST;
2093 rollback:
2094 br->hash_max = old;
2095 goto unlock;
2096 }
2097
2098 err = br_mdb_rehash(&br->mdb, br->hash_max,
2099 br->hash_elasticity);
2100 if (err)
2101 goto rollback;
2102 }
2103
2104 unlock:
2105 spin_unlock_bh(&br->multicast_lock);
2106
2107 return err;
2108 }
2109
2110 /**
2111 * br_multicast_list_adjacent - Returns snooped multicast addresses
2112 * @dev: The bridge port adjacent to which to retrieve addresses
2113 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2114 *
2115 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2116 * snooping feature on all bridge ports of dev's bridge device, excluding
2117 * the addresses from dev itself.
2118 *
2119 * Returns the number of items added to br_ip_list.
2120 *
2121 * Notes:
2122 * - br_ip_list needs to be initialized by caller
2123 * - br_ip_list might contain duplicates in the end
2124 * (needs to be taken care of by caller)
2125 * - br_ip_list needs to be freed by caller
2126 */
2127 int br_multicast_list_adjacent(struct net_device *dev,
2128 struct list_head *br_ip_list)
2129 {
2130 struct net_bridge *br;
2131 struct net_bridge_port *port;
2132 struct net_bridge_port_group *group;
2133 struct br_ip_list *entry;
2134 int count = 0;
2135
2136 rcu_read_lock();
2137 if (!br_ip_list || !br_port_exists(dev))
2138 goto unlock;
2139
2140 port = br_port_get_rcu(dev);
2141 if (!port || !port->br)
2142 goto unlock;
2143
2144 br = port->br;
2145
2146 list_for_each_entry_rcu(port, &br->port_list, list) {
2147 if (!port->dev || port->dev == dev)
2148 continue;
2149
2150 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2151 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2152 if (!entry)
2153 goto unlock;
2154
2155 entry->addr = group->addr;
2156 list_add(&entry->list, br_ip_list);
2157 count++;
2158 }
2159 }
2160
2161 unlock:
2162 rcu_read_unlock();
2163 return count;
2164 }
2165 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2166
2167 /**
2168 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2169 * @dev: The bridge port providing the bridge on which to check for a querier
2170 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2171 *
2172 * Checks whether the given interface has a bridge on top and if so returns
2173 * true if a valid querier exists anywhere on the bridged link layer.
2174 * Otherwise returns false.
2175 */
2176 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2177 {
2178 struct net_bridge *br;
2179 struct net_bridge_port *port;
2180 struct ethhdr eth;
2181 bool ret = false;
2182
2183 rcu_read_lock();
2184 if (!br_port_exists(dev))
2185 goto unlock;
2186
2187 port = br_port_get_rcu(dev);
2188 if (!port || !port->br)
2189 goto unlock;
2190
2191 br = port->br;
2192
2193 memset(&eth, 0, sizeof(eth));
2194 eth.h_proto = htons(proto);
2195
2196 ret = br_multicast_querier_exists(br, &eth);
2197
2198 unlock:
2199 rcu_read_unlock();
2200 return ret;
2201 }
2202 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2203
2204 /**
2205 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2206 * @dev: The bridge port adjacent to which to check for a querier
2207 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2208 *
2209 * Checks whether the given interface has a bridge on top and if so returns
2210 * true if a selected querier is behind one of the other ports of this
2211 * bridge. Otherwise returns false.
2212 */
2213 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2214 {
2215 struct net_bridge *br;
2216 struct net_bridge_port *port;
2217 bool ret = false;
2218
2219 rcu_read_lock();
2220 if (!br_port_exists(dev))
2221 goto unlock;
2222
2223 port = br_port_get_rcu(dev);
2224 if (!port || !port->br)
2225 goto unlock;
2226
2227 br = port->br;
2228
2229 switch (proto) {
2230 case ETH_P_IP:
2231 if (!timer_pending(&br->ip4_other_query.timer) ||
2232 rcu_dereference(br->ip4_querier.port) == port)
2233 goto unlock;
2234 break;
2235 #if IS_ENABLED(CONFIG_IPV6)
2236 case ETH_P_IPV6:
2237 if (!timer_pending(&br->ip6_other_query.timer) ||
2238 rcu_dereference(br->ip6_querier.port) == port)
2239 goto unlock;
2240 break;
2241 #endif
2242 default:
2243 goto unlock;
2244 }
2245
2246 ret = true;
2247 unlock:
2248 rcu_read_unlock();
2249 return ret;
2250 }
2251 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2252
2253 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2254 const struct sk_buff *skb, u8 type, u8 dir)
2255 {
2256 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2257 __be16 proto = skb->protocol;
2258 unsigned int t_len;
2259
2260 u64_stats_update_begin(&pstats->syncp);
2261 switch (proto) {
2262 case htons(ETH_P_IP):
2263 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2264 switch (type) {
2265 case IGMP_HOST_MEMBERSHIP_REPORT:
2266 pstats->mstats.igmp_v1reports[dir]++;
2267 break;
2268 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2269 pstats->mstats.igmp_v2reports[dir]++;
2270 break;
2271 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2272 pstats->mstats.igmp_v3reports[dir]++;
2273 break;
2274 case IGMP_HOST_MEMBERSHIP_QUERY:
2275 if (t_len != sizeof(struct igmphdr)) {
2276 pstats->mstats.igmp_v3queries[dir]++;
2277 } else {
2278 unsigned int offset = skb_transport_offset(skb);
2279 struct igmphdr *ih, _ihdr;
2280
2281 ih = skb_header_pointer(skb, offset,
2282 sizeof(_ihdr), &_ihdr);
2283 if (!ih)
2284 break;
2285 if (!ih->code)
2286 pstats->mstats.igmp_v1queries[dir]++;
2287 else
2288 pstats->mstats.igmp_v2queries[dir]++;
2289 }
2290 break;
2291 case IGMP_HOST_LEAVE_MESSAGE:
2292 pstats->mstats.igmp_leaves[dir]++;
2293 break;
2294 }
2295 break;
2296 #if IS_ENABLED(CONFIG_IPV6)
2297 case htons(ETH_P_IPV6):
2298 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2299 sizeof(struct ipv6hdr);
2300 t_len -= skb_network_header_len(skb);
2301 switch (type) {
2302 case ICMPV6_MGM_REPORT:
2303 pstats->mstats.mld_v1reports[dir]++;
2304 break;
2305 case ICMPV6_MLD2_REPORT:
2306 pstats->mstats.mld_v2reports[dir]++;
2307 break;
2308 case ICMPV6_MGM_QUERY:
2309 if (t_len != sizeof(struct mld_msg))
2310 pstats->mstats.mld_v2queries[dir]++;
2311 else
2312 pstats->mstats.mld_v1queries[dir]++;
2313 break;
2314 case ICMPV6_MGM_REDUCTION:
2315 pstats->mstats.mld_leaves[dir]++;
2316 break;
2317 }
2318 break;
2319 #endif /* CONFIG_IPV6 */
2320 }
2321 u64_stats_update_end(&pstats->syncp);
2322 }
2323
2324 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2325 const struct sk_buff *skb, u8 type, u8 dir)
2326 {
2327 struct bridge_mcast_stats __percpu *stats;
2328
2329 /* if multicast_disabled is true then igmp type can't be set */
2330 if (!type || !br->multicast_stats_enabled)
2331 return;
2332
2333 if (p)
2334 stats = p->mcast_stats;
2335 else
2336 stats = br->mcast_stats;
2337 if (WARN_ON(!stats))
2338 return;
2339
2340 br_mcast_stats_add(stats, skb, type, dir);
2341 }
2342
2343 int br_multicast_init_stats(struct net_bridge *br)
2344 {
2345 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2346 if (!br->mcast_stats)
2347 return -ENOMEM;
2348
2349 return 0;
2350 }
2351
2352 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2353 {
2354 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2355 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2356 }
2357
2358 void br_multicast_get_stats(const struct net_bridge *br,
2359 const struct net_bridge_port *p,
2360 struct br_mcast_stats *dest)
2361 {
2362 struct bridge_mcast_stats __percpu *stats;
2363 struct br_mcast_stats tdst;
2364 int i;
2365
2366 memset(dest, 0, sizeof(*dest));
2367 if (p)
2368 stats = p->mcast_stats;
2369 else
2370 stats = br->mcast_stats;
2371 if (WARN_ON(!stats))
2372 return;
2373
2374 memset(&tdst, 0, sizeof(tdst));
2375 for_each_possible_cpu(i) {
2376 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2377 struct br_mcast_stats temp;
2378 unsigned int start;
2379
2380 do {
2381 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2382 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2383 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2384
2385 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2386 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2387 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2388 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2389 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2390 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2391 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2392 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2393
2394 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2395 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2396 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2397 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2398 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2399 tdst.mld_parse_errors += temp.mld_parse_errors;
2400 }
2401 memcpy(dest, &tdst, sizeof(*dest));
2402 }
Linux with added FPC-III support