2 * Bridge multicast support.
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
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)
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>
29 #if IS_ENABLED(CONFIG_IPV6)
32 #include <net/ip6_checksum.h>
33 #include <net/addrconf.h>
36 #include "br_private.h"
38 static void br_multicast_start_querier(struct net_bridge *br,
39 struct bridge_mcast_own_query *query);
40 unsigned int br_mdb_rehash_seq;
42 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
44 if (a->proto != b->proto)
50 return a->u.ip4 == b->u.ip4;
51 #if IS_ENABLED(CONFIG_IPV6)
52 case htons(ETH_P_IPV6):
53 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
59 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
62 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
65 #if IS_ENABLED(CONFIG_IPV6)
66 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
67 const struct in6_addr *ip,
70 return jhash_2words(ipv6_addr_hash(ip), vid,
71 mdb->secret) & (mdb->max - 1);
75 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
80 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
81 #if IS_ENABLED(CONFIG_IPV6)
82 case htons(ETH_P_IPV6):
83 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
89 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
90 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
92 struct net_bridge_mdb_entry *mp;
94 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
95 if (br_ip_equal(&mp->addr, dst))
102 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
108 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
111 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
112 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
117 br_dst.proto = htons(ETH_P_IP);
120 return br_mdb_ip_get(mdb, &br_dst);
123 #if IS_ENABLED(CONFIG_IPV6)
124 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
125 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
131 br_dst.proto = htons(ETH_P_IPV6);
134 return br_mdb_ip_get(mdb, &br_dst);
138 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
139 struct sk_buff *skb, u16 vid)
141 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
144 if (br->multicast_disabled)
147 if (BR_INPUT_SKB_CB(skb)->igmp)
150 ip.proto = skb->protocol;
153 switch (skb->protocol) {
154 case htons(ETH_P_IP):
155 ip.u.ip4 = ip_hdr(skb)->daddr;
157 #if IS_ENABLED(CONFIG_IPV6)
158 case htons(ETH_P_IPV6):
159 ip.u.ip6 = ipv6_hdr(skb)->daddr;
166 return br_mdb_ip_get(mdb, &ip);
169 static void br_mdb_free(struct rcu_head *head)
171 struct net_bridge_mdb_htable *mdb =
172 container_of(head, struct net_bridge_mdb_htable, rcu);
173 struct net_bridge_mdb_htable *old = mdb->old;
180 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
181 struct net_bridge_mdb_htable *old,
184 struct net_bridge_mdb_entry *mp;
189 for (i = 0; i < old->max; i++)
190 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
191 hlist_add_head(&mp->hlist[new->ver],
192 &new->mhash[br_ip_hash(new, &mp->addr)]);
198 for (i = 0; i < new->max; i++) {
200 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
206 return maxlen > elasticity ? -EINVAL : 0;
209 void br_multicast_free_pg(struct rcu_head *head)
211 struct net_bridge_port_group *p =
212 container_of(head, struct net_bridge_port_group, rcu);
217 static void br_multicast_free_group(struct rcu_head *head)
219 struct net_bridge_mdb_entry *mp =
220 container_of(head, struct net_bridge_mdb_entry, rcu);
225 static void br_multicast_group_expired(unsigned long data)
227 struct net_bridge_mdb_entry *mp = (void *)data;
228 struct net_bridge *br = mp->br;
229 struct net_bridge_mdb_htable *mdb;
231 spin_lock(&br->multicast_lock);
232 if (!netif_running(br->dev) || timer_pending(&mp->timer))
240 mdb = mlock_dereference(br->mdb, br);
242 hlist_del_rcu(&mp->hlist[mdb->ver]);
245 call_rcu_bh(&mp->rcu, br_multicast_free_group);
248 spin_unlock(&br->multicast_lock);
251 static void br_multicast_del_pg(struct net_bridge *br,
252 struct net_bridge_port_group *pg)
254 struct net_bridge_mdb_htable *mdb;
255 struct net_bridge_mdb_entry *mp;
256 struct net_bridge_port_group *p;
257 struct net_bridge_port_group __rcu **pp;
259 mdb = mlock_dereference(br->mdb, br);
261 mp = br_mdb_ip_get(mdb, &pg->addr);
265 for (pp = &mp->ports;
266 (p = mlock_dereference(*pp, br)) != NULL;
271 rcu_assign_pointer(*pp, p->next);
272 hlist_del_init(&p->mglist);
273 del_timer(&p->timer);
274 call_rcu_bh(&p->rcu, br_multicast_free_pg);
276 if (!mp->ports && !mp->mglist &&
277 netif_running(br->dev))
278 mod_timer(&mp->timer, jiffies);
286 static void br_multicast_port_group_expired(unsigned long data)
288 struct net_bridge_port_group *pg = (void *)data;
289 struct net_bridge *br = pg->port->br;
291 spin_lock(&br->multicast_lock);
292 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
293 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
296 br_multicast_del_pg(br, pg);
299 spin_unlock(&br->multicast_lock);
302 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
305 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
306 struct net_bridge_mdb_htable *mdb;
309 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
316 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
322 mdb->size = old ? old->size : 0;
323 mdb->ver = old ? old->ver ^ 1 : 0;
325 if (!old || elasticity)
326 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
328 mdb->secret = old->secret;
333 err = br_mdb_copy(mdb, old, elasticity);
341 call_rcu_bh(&mdb->rcu, br_mdb_free);
344 rcu_assign_pointer(*mdbp, mdb);
349 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
357 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
362 skb->protocol = htons(ETH_P_IP);
364 skb_reset_mac_header(skb);
367 ether_addr_copy(eth->h_source, br->dev->dev_addr);
370 eth->h_dest[2] = 0x5e;
374 eth->h_proto = htons(ETH_P_IP);
375 skb_put(skb, sizeof(*eth));
377 skb_set_network_header(skb, skb->len);
383 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
385 iph->frag_off = htons(IP_DF);
387 iph->protocol = IPPROTO_IGMP;
388 iph->saddr = br->multicast_query_use_ifaddr ?
389 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
390 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
391 ((u8 *)&iph[1])[0] = IPOPT_RA;
392 ((u8 *)&iph[1])[1] = 4;
393 ((u8 *)&iph[1])[2] = 0;
394 ((u8 *)&iph[1])[3] = 0;
398 skb_set_transport_header(skb, skb->len);
400 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
401 ih->code = (group ? br->multicast_last_member_interval :
402 br->multicast_query_response_interval) /
403 (HZ / IGMP_TIMER_SCALE);
406 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
407 skb_put(skb, sizeof(*ih));
409 __skb_pull(skb, sizeof(*eth));
415 #if IS_ENABLED(CONFIG_IPV6)
416 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
417 const struct in6_addr *group)
420 struct ipv6hdr *ip6h;
421 struct mld_msg *mldq;
424 unsigned long interval;
426 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
431 skb->protocol = htons(ETH_P_IPV6);
433 /* Ethernet header */
434 skb_reset_mac_header(skb);
437 ether_addr_copy(eth->h_source, br->dev->dev_addr);
438 eth->h_proto = htons(ETH_P_IPV6);
439 skb_put(skb, sizeof(*eth));
441 /* IPv6 header + HbH option */
442 skb_set_network_header(skb, skb->len);
443 ip6h = ipv6_hdr(skb);
445 *(__force __be32 *)ip6h = htonl(0x60000000);
446 ip6h->payload_len = htons(8 + sizeof(*mldq));
447 ip6h->nexthdr = IPPROTO_HOPOPTS;
449 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
450 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
455 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
457 hopopt = (u8 *)(ip6h + 1);
458 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
459 hopopt[1] = 0; /* length of HbH */
460 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
461 hopopt[3] = 2; /* Length of RA Option */
462 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
464 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
465 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
467 skb_put(skb, sizeof(*ip6h) + 8);
470 skb_set_transport_header(skb, skb->len);
471 mldq = (struct mld_msg *) icmp6_hdr(skb);
473 interval = ipv6_addr_any(group) ?
474 br->multicast_query_response_interval :
475 br->multicast_last_member_interval;
477 mldq->mld_type = ICMPV6_MGM_QUERY;
480 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
481 mldq->mld_reserved = 0;
482 mldq->mld_mca = *group;
485 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
486 sizeof(*mldq), IPPROTO_ICMPV6,
489 skb_put(skb, sizeof(*mldq));
491 __skb_pull(skb, sizeof(*eth));
498 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
501 switch (addr->proto) {
502 case htons(ETH_P_IP):
503 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
504 #if IS_ENABLED(CONFIG_IPV6)
505 case htons(ETH_P_IPV6):
506 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
512 static struct net_bridge_mdb_entry *br_multicast_get_group(
513 struct net_bridge *br, struct net_bridge_port *port,
514 struct br_ip *group, int hash)
516 struct net_bridge_mdb_htable *mdb;
517 struct net_bridge_mdb_entry *mp;
518 unsigned int count = 0;
523 mdb = rcu_dereference_protected(br->mdb, 1);
524 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
526 if (unlikely(br_ip_equal(group, &mp->addr)))
533 if (unlikely(count > br->hash_elasticity && count)) {
535 br_info(br, "Multicast hash table "
536 "chain limit reached: %s\n",
537 port ? port->dev->name : br->dev->name);
539 elasticity = br->hash_elasticity;
542 if (mdb->size >= max) {
544 if (unlikely(max > br->hash_max)) {
545 br_warn(br, "Multicast hash table maximum of %d "
546 "reached, disabling snooping: %s\n",
548 port ? port->dev->name : br->dev->name);
551 br->multicast_disabled = 1;
556 if (max > mdb->max || elasticity) {
559 br_info(br, "Multicast hash table "
561 port ? port->dev->name : br->dev->name);
566 err = br_mdb_rehash(&br->mdb, max, elasticity);
568 br_warn(br, "Cannot rehash multicast "
569 "hash table, disabling snooping: %s, %d, %d\n",
570 port ? port->dev->name : br->dev->name,
586 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
587 struct net_bridge_port *port, struct br_ip *group)
589 struct net_bridge_mdb_htable *mdb;
590 struct net_bridge_mdb_entry *mp;
594 mdb = rcu_dereference_protected(br->mdb, 1);
596 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
602 hash = br_ip_hash(mdb, group);
603 mp = br_multicast_get_group(br, port, group, hash);
604 switch (PTR_ERR(mp)) {
610 mdb = rcu_dereference_protected(br->mdb, 1);
611 hash = br_ip_hash(mdb, group);
618 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
620 return ERR_PTR(-ENOMEM);
624 setup_timer(&mp->timer, br_multicast_group_expired,
627 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
634 struct net_bridge_port_group *br_multicast_new_port_group(
635 struct net_bridge_port *port,
637 struct net_bridge_port_group __rcu *next,
640 struct net_bridge_port_group *p;
642 p = kzalloc(sizeof(*p), GFP_ATOMIC);
649 rcu_assign_pointer(p->next, next);
650 hlist_add_head(&p->mglist, &port->mglist);
651 setup_timer(&p->timer, br_multicast_port_group_expired,
656 static int br_multicast_add_group(struct net_bridge *br,
657 struct net_bridge_port *port,
660 struct net_bridge_mdb_entry *mp;
661 struct net_bridge_port_group *p;
662 struct net_bridge_port_group __rcu **pp;
663 unsigned long now = jiffies;
666 spin_lock(&br->multicast_lock);
667 if (!netif_running(br->dev) ||
668 (port && port->state == BR_STATE_DISABLED))
671 mp = br_multicast_new_group(br, port, group);
678 mod_timer(&mp->timer, now + br->multicast_membership_interval);
682 for (pp = &mp->ports;
683 (p = mlock_dereference(*pp, br)) != NULL;
687 if ((unsigned long)p->port < (unsigned long)port)
691 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
694 rcu_assign_pointer(*pp, p);
695 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
698 mod_timer(&p->timer, now + br->multicast_membership_interval);
703 spin_unlock(&br->multicast_lock);
707 static int br_ip4_multicast_add_group(struct net_bridge *br,
708 struct net_bridge_port *port,
712 struct br_ip br_group;
714 if (ipv4_is_local_multicast(group))
717 br_group.u.ip4 = group;
718 br_group.proto = htons(ETH_P_IP);
721 return br_multicast_add_group(br, port, &br_group);
724 #if IS_ENABLED(CONFIG_IPV6)
725 static int br_ip6_multicast_add_group(struct net_bridge *br,
726 struct net_bridge_port *port,
727 const struct in6_addr *group,
730 struct br_ip br_group;
732 if (ipv6_addr_is_ll_all_nodes(group))
735 br_group.u.ip6 = *group;
736 br_group.proto = htons(ETH_P_IPV6);
739 return br_multicast_add_group(br, port, &br_group);
743 static void br_multicast_router_expired(unsigned long data)
745 struct net_bridge_port *port = (void *)data;
746 struct net_bridge *br = port->br;
748 spin_lock(&br->multicast_lock);
749 if (port->multicast_router != 1 ||
750 timer_pending(&port->multicast_router_timer) ||
751 hlist_unhashed(&port->rlist))
754 hlist_del_init_rcu(&port->rlist);
757 spin_unlock(&br->multicast_lock);
760 static void br_multicast_local_router_expired(unsigned long data)
764 static void br_multicast_querier_expired(struct net_bridge *br,
765 struct bridge_mcast_own_query *query)
767 spin_lock(&br->multicast_lock);
768 if (!netif_running(br->dev) || br->multicast_disabled)
771 br_multicast_start_querier(br, query);
774 spin_unlock(&br->multicast_lock);
777 static void br_ip4_multicast_querier_expired(unsigned long data)
779 struct net_bridge *br = (void *)data;
781 br_multicast_querier_expired(br, &br->ip4_own_query);
784 #if IS_ENABLED(CONFIG_IPV6)
785 static void br_ip6_multicast_querier_expired(unsigned long data)
787 struct net_bridge *br = (void *)data;
789 br_multicast_querier_expired(br, &br->ip6_own_query);
793 static void br_multicast_select_own_querier(struct net_bridge *br,
797 if (ip->proto == htons(ETH_P_IP))
798 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
799 #if IS_ENABLED(CONFIG_IPV6)
801 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
805 static void __br_multicast_send_query(struct net_bridge *br,
806 struct net_bridge_port *port,
811 skb = br_multicast_alloc_query(br, ip);
816 skb->dev = port->dev;
817 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, NULL, skb,
819 br_dev_queue_push_xmit);
821 br_multicast_select_own_querier(br, ip, skb);
826 static void br_multicast_send_query(struct net_bridge *br,
827 struct net_bridge_port *port,
828 struct bridge_mcast_own_query *own_query)
831 struct br_ip br_group;
832 struct bridge_mcast_other_query *other_query = NULL;
834 if (!netif_running(br->dev) || br->multicast_disabled ||
835 !br->multicast_querier)
838 memset(&br_group.u, 0, sizeof(br_group.u));
840 if (port ? (own_query == &port->ip4_own_query) :
841 (own_query == &br->ip4_own_query)) {
842 other_query = &br->ip4_other_query;
843 br_group.proto = htons(ETH_P_IP);
844 #if IS_ENABLED(CONFIG_IPV6)
846 other_query = &br->ip6_other_query;
847 br_group.proto = htons(ETH_P_IPV6);
851 if (!other_query || timer_pending(&other_query->timer))
854 __br_multicast_send_query(br, port, &br_group);
857 time += own_query->startup_sent < br->multicast_startup_query_count ?
858 br->multicast_startup_query_interval :
859 br->multicast_query_interval;
860 mod_timer(&own_query->timer, time);
864 br_multicast_port_query_expired(struct net_bridge_port *port,
865 struct bridge_mcast_own_query *query)
867 struct net_bridge *br = port->br;
869 spin_lock(&br->multicast_lock);
870 if (port->state == BR_STATE_DISABLED ||
871 port->state == BR_STATE_BLOCKING)
874 if (query->startup_sent < br->multicast_startup_query_count)
875 query->startup_sent++;
877 br_multicast_send_query(port->br, port, query);
880 spin_unlock(&br->multicast_lock);
883 static void br_ip4_multicast_port_query_expired(unsigned long data)
885 struct net_bridge_port *port = (void *)data;
887 br_multicast_port_query_expired(port, &port->ip4_own_query);
890 #if IS_ENABLED(CONFIG_IPV6)
891 static void br_ip6_multicast_port_query_expired(unsigned long data)
893 struct net_bridge_port *port = (void *)data;
895 br_multicast_port_query_expired(port, &port->ip6_own_query);
899 void br_multicast_add_port(struct net_bridge_port *port)
901 port->multicast_router = 1;
903 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
904 (unsigned long)port);
905 setup_timer(&port->ip4_own_query.timer,
906 br_ip4_multicast_port_query_expired, (unsigned long)port);
907 #if IS_ENABLED(CONFIG_IPV6)
908 setup_timer(&port->ip6_own_query.timer,
909 br_ip6_multicast_port_query_expired, (unsigned long)port);
913 void br_multicast_del_port(struct net_bridge_port *port)
915 del_timer_sync(&port->multicast_router_timer);
918 static void br_multicast_enable(struct bridge_mcast_own_query *query)
920 query->startup_sent = 0;
922 if (try_to_del_timer_sync(&query->timer) >= 0 ||
923 del_timer(&query->timer))
924 mod_timer(&query->timer, jiffies);
927 void br_multicast_enable_port(struct net_bridge_port *port)
929 struct net_bridge *br = port->br;
931 spin_lock(&br->multicast_lock);
932 if (br->multicast_disabled || !netif_running(br->dev))
935 br_multicast_enable(&port->ip4_own_query);
936 #if IS_ENABLED(CONFIG_IPV6)
937 br_multicast_enable(&port->ip6_own_query);
941 spin_unlock(&br->multicast_lock);
944 void br_multicast_disable_port(struct net_bridge_port *port)
946 struct net_bridge *br = port->br;
947 struct net_bridge_port_group *pg;
948 struct hlist_node *n;
950 spin_lock(&br->multicast_lock);
951 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
952 br_multicast_del_pg(br, pg);
954 if (!hlist_unhashed(&port->rlist))
955 hlist_del_init_rcu(&port->rlist);
956 del_timer(&port->multicast_router_timer);
957 del_timer(&port->ip4_own_query.timer);
958 #if IS_ENABLED(CONFIG_IPV6)
959 del_timer(&port->ip6_own_query.timer);
961 spin_unlock(&br->multicast_lock);
964 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
965 struct net_bridge_port *port,
969 struct igmpv3_report *ih;
970 struct igmpv3_grec *grec;
978 ih = igmpv3_report_hdr(skb);
979 num = ntohs(ih->ngrec);
982 for (i = 0; i < num; i++) {
983 len += sizeof(*grec);
984 if (!pskb_may_pull(skb, len))
987 grec = (void *)(skb->data + len - sizeof(*grec));
988 group = grec->grec_mca;
989 type = grec->grec_type;
991 len += ntohs(grec->grec_nsrcs) * 4;
992 if (!pskb_may_pull(skb, len))
995 /* We treat this as an IGMPv2 report for now. */
997 case IGMPV3_MODE_IS_INCLUDE:
998 case IGMPV3_MODE_IS_EXCLUDE:
999 case IGMPV3_CHANGE_TO_INCLUDE:
1000 case IGMPV3_CHANGE_TO_EXCLUDE:
1001 case IGMPV3_ALLOW_NEW_SOURCES:
1002 case IGMPV3_BLOCK_OLD_SOURCES:
1009 err = br_ip4_multicast_add_group(br, port, group, vid);
1017 #if IS_ENABLED(CONFIG_IPV6)
1018 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1019 struct net_bridge_port *port,
1020 struct sk_buff *skb,
1023 struct icmp6hdr *icmp6h;
1024 struct mld2_grec *grec;
1030 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1033 icmp6h = icmp6_hdr(skb);
1034 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1035 len = sizeof(*icmp6h);
1037 for (i = 0; i < num; i++) {
1038 __be16 *nsrcs, _nsrcs;
1040 nsrcs = skb_header_pointer(skb,
1041 len + offsetof(struct mld2_grec,
1043 sizeof(_nsrcs), &_nsrcs);
1047 if (!pskb_may_pull(skb,
1048 len + sizeof(*grec) +
1049 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1052 grec = (struct mld2_grec *)(skb->data + len);
1053 len += sizeof(*grec) +
1054 sizeof(struct in6_addr) * ntohs(*nsrcs);
1056 /* We treat these as MLDv1 reports for now. */
1057 switch (grec->grec_type) {
1058 case MLD2_MODE_IS_INCLUDE:
1059 case MLD2_MODE_IS_EXCLUDE:
1060 case MLD2_CHANGE_TO_INCLUDE:
1061 case MLD2_CHANGE_TO_EXCLUDE:
1062 case MLD2_ALLOW_NEW_SOURCES:
1063 case MLD2_BLOCK_OLD_SOURCES:
1070 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1080 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1081 struct net_bridge_port *port,
1084 if (!timer_pending(&br->ip4_own_query.timer) &&
1085 !timer_pending(&br->ip4_other_query.timer))
1088 if (!br->ip4_querier.addr.u.ip4)
1091 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1097 br->ip4_querier.addr.u.ip4 = saddr;
1099 /* update protected by general multicast_lock by caller */
1100 rcu_assign_pointer(br->ip4_querier.port, port);
1105 #if IS_ENABLED(CONFIG_IPV6)
1106 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1107 struct net_bridge_port *port,
1108 struct in6_addr *saddr)
1110 if (!timer_pending(&br->ip6_own_query.timer) &&
1111 !timer_pending(&br->ip6_other_query.timer))
1114 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1120 br->ip6_querier.addr.u.ip6 = *saddr;
1122 /* update protected by general multicast_lock by caller */
1123 rcu_assign_pointer(br->ip6_querier.port, port);
1129 static bool br_multicast_select_querier(struct net_bridge *br,
1130 struct net_bridge_port *port,
1131 struct br_ip *saddr)
1133 switch (saddr->proto) {
1134 case htons(ETH_P_IP):
1135 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1136 #if IS_ENABLED(CONFIG_IPV6)
1137 case htons(ETH_P_IPV6):
1138 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1146 br_multicast_update_query_timer(struct net_bridge *br,
1147 struct bridge_mcast_other_query *query,
1148 unsigned long max_delay)
1150 if (!timer_pending(&query->timer))
1151 query->delay_time = jiffies + max_delay;
1153 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1157 * Add port to router_list
1158 * list is maintained ordered by pointer value
1159 * and locked by br->multicast_lock and RCU
1161 static void br_multicast_add_router(struct net_bridge *br,
1162 struct net_bridge_port *port)
1164 struct net_bridge_port *p;
1165 struct hlist_node *slot = NULL;
1167 hlist_for_each_entry(p, &br->router_list, rlist) {
1168 if ((unsigned long) port >= (unsigned long) p)
1174 hlist_add_behind_rcu(&port->rlist, slot);
1176 hlist_add_head_rcu(&port->rlist, &br->router_list);
1179 static void br_multicast_mark_router(struct net_bridge *br,
1180 struct net_bridge_port *port)
1182 unsigned long now = jiffies;
1185 if (br->multicast_router == 1)
1186 mod_timer(&br->multicast_router_timer,
1187 now + br->multicast_querier_interval);
1191 if (port->multicast_router != 1)
1194 if (!hlist_unhashed(&port->rlist))
1197 br_multicast_add_router(br, port);
1200 mod_timer(&port->multicast_router_timer,
1201 now + br->multicast_querier_interval);
1204 static void br_multicast_query_received(struct net_bridge *br,
1205 struct net_bridge_port *port,
1206 struct bridge_mcast_other_query *query,
1207 struct br_ip *saddr,
1208 unsigned long max_delay)
1210 if (!br_multicast_select_querier(br, port, saddr))
1213 br_multicast_update_query_timer(br, query, max_delay);
1214 br_multicast_mark_router(br, port);
1217 static int br_ip4_multicast_query(struct net_bridge *br,
1218 struct net_bridge_port *port,
1219 struct sk_buff *skb,
1222 const struct iphdr *iph = ip_hdr(skb);
1223 struct igmphdr *ih = igmp_hdr(skb);
1224 struct net_bridge_mdb_entry *mp;
1225 struct igmpv3_query *ih3;
1226 struct net_bridge_port_group *p;
1227 struct net_bridge_port_group __rcu **pp;
1229 unsigned long max_delay;
1230 unsigned long now = jiffies;
1234 spin_lock(&br->multicast_lock);
1235 if (!netif_running(br->dev) ||
1236 (port && port->state == BR_STATE_DISABLED))
1241 if (skb->len == sizeof(*ih)) {
1242 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1245 max_delay = 10 * HZ;
1248 } else if (skb->len >= sizeof(*ih3)) {
1249 ih3 = igmpv3_query_hdr(skb);
1253 max_delay = ih3->code ?
1254 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1260 saddr.proto = htons(ETH_P_IP);
1261 saddr.u.ip4 = iph->saddr;
1263 br_multicast_query_received(br, port, &br->ip4_other_query,
1268 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1272 max_delay *= br->multicast_last_member_count;
1275 (timer_pending(&mp->timer) ?
1276 time_after(mp->timer.expires, now + max_delay) :
1277 try_to_del_timer_sync(&mp->timer) >= 0))
1278 mod_timer(&mp->timer, now + max_delay);
1280 for (pp = &mp->ports;
1281 (p = mlock_dereference(*pp, br)) != NULL;
1283 if (timer_pending(&p->timer) ?
1284 time_after(p->timer.expires, now + max_delay) :
1285 try_to_del_timer_sync(&p->timer) >= 0)
1286 mod_timer(&p->timer, now + max_delay);
1290 spin_unlock(&br->multicast_lock);
1294 #if IS_ENABLED(CONFIG_IPV6)
1295 static int br_ip6_multicast_query(struct net_bridge *br,
1296 struct net_bridge_port *port,
1297 struct sk_buff *skb,
1300 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1301 struct mld_msg *mld;
1302 struct net_bridge_mdb_entry *mp;
1303 struct mld2_query *mld2q;
1304 struct net_bridge_port_group *p;
1305 struct net_bridge_port_group __rcu **pp;
1307 unsigned long max_delay;
1308 unsigned long now = jiffies;
1309 const struct in6_addr *group = NULL;
1310 bool is_general_query;
1313 spin_lock(&br->multicast_lock);
1314 if (!netif_running(br->dev) ||
1315 (port && port->state == BR_STATE_DISABLED))
1318 if (skb->len == sizeof(*mld)) {
1319 if (!pskb_may_pull(skb, sizeof(*mld))) {
1323 mld = (struct mld_msg *) icmp6_hdr(skb);
1324 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1326 group = &mld->mld_mca;
1328 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1332 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1333 if (!mld2q->mld2q_nsrcs)
1334 group = &mld2q->mld2q_mca;
1336 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1339 is_general_query = group && ipv6_addr_any(group);
1341 if (is_general_query) {
1342 saddr.proto = htons(ETH_P_IPV6);
1343 saddr.u.ip6 = ip6h->saddr;
1345 br_multicast_query_received(br, port, &br->ip6_other_query,
1348 } else if (!group) {
1352 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1356 max_delay *= br->multicast_last_member_count;
1358 (timer_pending(&mp->timer) ?
1359 time_after(mp->timer.expires, now + max_delay) :
1360 try_to_del_timer_sync(&mp->timer) >= 0))
1361 mod_timer(&mp->timer, now + max_delay);
1363 for (pp = &mp->ports;
1364 (p = mlock_dereference(*pp, br)) != NULL;
1366 if (timer_pending(&p->timer) ?
1367 time_after(p->timer.expires, now + max_delay) :
1368 try_to_del_timer_sync(&p->timer) >= 0)
1369 mod_timer(&p->timer, now + max_delay);
1373 spin_unlock(&br->multicast_lock);
1379 br_multicast_leave_group(struct net_bridge *br,
1380 struct net_bridge_port *port,
1381 struct br_ip *group,
1382 struct bridge_mcast_other_query *other_query,
1383 struct bridge_mcast_own_query *own_query)
1385 struct net_bridge_mdb_htable *mdb;
1386 struct net_bridge_mdb_entry *mp;
1387 struct net_bridge_port_group *p;
1391 spin_lock(&br->multicast_lock);
1392 if (!netif_running(br->dev) ||
1393 (port && port->state == BR_STATE_DISABLED) ||
1394 timer_pending(&other_query->timer))
1397 mdb = mlock_dereference(br->mdb, br);
1398 mp = br_mdb_ip_get(mdb, group);
1402 if (br->multicast_querier) {
1403 __br_multicast_send_query(br, port, &mp->addr);
1405 time = jiffies + br->multicast_last_member_count *
1406 br->multicast_last_member_interval;
1408 mod_timer(&own_query->timer, time);
1410 for (p = mlock_dereference(mp->ports, br);
1412 p = mlock_dereference(p->next, br)) {
1413 if (p->port != port)
1416 if (!hlist_unhashed(&p->mglist) &&
1417 (timer_pending(&p->timer) ?
1418 time_after(p->timer.expires, time) :
1419 try_to_del_timer_sync(&p->timer) >= 0)) {
1420 mod_timer(&p->timer, time);
1427 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1428 struct net_bridge_port_group __rcu **pp;
1430 for (pp = &mp->ports;
1431 (p = mlock_dereference(*pp, br)) != NULL;
1433 if (p->port != port)
1436 rcu_assign_pointer(*pp, p->next);
1437 hlist_del_init(&p->mglist);
1438 del_timer(&p->timer);
1439 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1440 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1442 if (!mp->ports && !mp->mglist &&
1443 netif_running(br->dev))
1444 mod_timer(&mp->timer, jiffies);
1450 time = now + br->multicast_last_member_count *
1451 br->multicast_last_member_interval;
1455 (timer_pending(&mp->timer) ?
1456 time_after(mp->timer.expires, time) :
1457 try_to_del_timer_sync(&mp->timer) >= 0)) {
1458 mod_timer(&mp->timer, time);
1464 for (p = mlock_dereference(mp->ports, br);
1466 p = mlock_dereference(p->next, br)) {
1467 if (p->port != port)
1470 if (!hlist_unhashed(&p->mglist) &&
1471 (timer_pending(&p->timer) ?
1472 time_after(p->timer.expires, time) :
1473 try_to_del_timer_sync(&p->timer) >= 0)) {
1474 mod_timer(&p->timer, time);
1480 spin_unlock(&br->multicast_lock);
1483 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1484 struct net_bridge_port *port,
1488 struct br_ip br_group;
1489 struct bridge_mcast_own_query *own_query;
1491 if (ipv4_is_local_multicast(group))
1494 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1496 br_group.u.ip4 = group;
1497 br_group.proto = htons(ETH_P_IP);
1500 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1504 #if IS_ENABLED(CONFIG_IPV6)
1505 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1506 struct net_bridge_port *port,
1507 const struct in6_addr *group,
1510 struct br_ip br_group;
1511 struct bridge_mcast_own_query *own_query;
1513 if (ipv6_addr_is_ll_all_nodes(group))
1516 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1518 br_group.u.ip6 = *group;
1519 br_group.proto = htons(ETH_P_IPV6);
1522 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1527 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1528 struct net_bridge_port *port,
1529 struct sk_buff *skb,
1532 struct sk_buff *skb_trimmed = NULL;
1536 err = ip_mc_check_igmp(skb, &skb_trimmed);
1538 if (err == -ENOMSG) {
1539 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1540 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1542 } else if (err < 0) {
1546 BR_INPUT_SKB_CB(skb)->igmp = 1;
1550 case IGMP_HOST_MEMBERSHIP_REPORT:
1551 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1552 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1553 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1555 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1556 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1558 case IGMP_HOST_MEMBERSHIP_QUERY:
1559 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1561 case IGMP_HOST_LEAVE_MESSAGE:
1562 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1567 kfree_skb(skb_trimmed);
1572 #if IS_ENABLED(CONFIG_IPV6)
1573 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1574 struct net_bridge_port *port,
1575 struct sk_buff *skb,
1578 struct sk_buff *skb_trimmed = NULL;
1579 struct mld_msg *mld;
1582 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1584 if (err == -ENOMSG) {
1585 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1586 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1588 } else if (err < 0) {
1592 BR_INPUT_SKB_CB(skb)->igmp = 1;
1593 mld = (struct mld_msg *)skb_transport_header(skb);
1595 switch (mld->mld_type) {
1596 case ICMPV6_MGM_REPORT:
1597 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1598 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1600 case ICMPV6_MLD2_REPORT:
1601 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1603 case ICMPV6_MGM_QUERY:
1604 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1606 case ICMPV6_MGM_REDUCTION:
1607 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1612 kfree_skb(skb_trimmed);
1618 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1619 struct sk_buff *skb, u16 vid)
1621 BR_INPUT_SKB_CB(skb)->igmp = 0;
1622 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1624 if (br->multicast_disabled)
1627 switch (skb->protocol) {
1628 case htons(ETH_P_IP):
1629 return br_multicast_ipv4_rcv(br, port, skb, vid);
1630 #if IS_ENABLED(CONFIG_IPV6)
1631 case htons(ETH_P_IPV6):
1632 return br_multicast_ipv6_rcv(br, port, skb, vid);
1639 static void br_multicast_query_expired(struct net_bridge *br,
1640 struct bridge_mcast_own_query *query,
1641 struct bridge_mcast_querier *querier)
1643 spin_lock(&br->multicast_lock);
1644 if (query->startup_sent < br->multicast_startup_query_count)
1645 query->startup_sent++;
1647 RCU_INIT_POINTER(querier, NULL);
1648 br_multicast_send_query(br, NULL, query);
1649 spin_unlock(&br->multicast_lock);
1652 static void br_ip4_multicast_query_expired(unsigned long data)
1654 struct net_bridge *br = (void *)data;
1656 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1659 #if IS_ENABLED(CONFIG_IPV6)
1660 static void br_ip6_multicast_query_expired(unsigned long data)
1662 struct net_bridge *br = (void *)data;
1664 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1668 void br_multicast_init(struct net_bridge *br)
1670 br->hash_elasticity = 4;
1673 br->multicast_router = 1;
1674 br->multicast_querier = 0;
1675 br->multicast_query_use_ifaddr = 0;
1676 br->multicast_last_member_count = 2;
1677 br->multicast_startup_query_count = 2;
1679 br->multicast_last_member_interval = HZ;
1680 br->multicast_query_response_interval = 10 * HZ;
1681 br->multicast_startup_query_interval = 125 * HZ / 4;
1682 br->multicast_query_interval = 125 * HZ;
1683 br->multicast_querier_interval = 255 * HZ;
1684 br->multicast_membership_interval = 260 * HZ;
1686 br->ip4_other_query.delay_time = 0;
1687 br->ip4_querier.port = NULL;
1688 #if IS_ENABLED(CONFIG_IPV6)
1689 br->ip6_other_query.delay_time = 0;
1690 br->ip6_querier.port = NULL;
1693 spin_lock_init(&br->multicast_lock);
1694 setup_timer(&br->multicast_router_timer,
1695 br_multicast_local_router_expired, 0);
1696 setup_timer(&br->ip4_other_query.timer,
1697 br_ip4_multicast_querier_expired, (unsigned long)br);
1698 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1700 #if IS_ENABLED(CONFIG_IPV6)
1701 setup_timer(&br->ip6_other_query.timer,
1702 br_ip6_multicast_querier_expired, (unsigned long)br);
1703 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1708 static void __br_multicast_open(struct net_bridge *br,
1709 struct bridge_mcast_own_query *query)
1711 query->startup_sent = 0;
1713 if (br->multicast_disabled)
1716 mod_timer(&query->timer, jiffies);
1719 void br_multicast_open(struct net_bridge *br)
1721 __br_multicast_open(br, &br->ip4_own_query);
1722 #if IS_ENABLED(CONFIG_IPV6)
1723 __br_multicast_open(br, &br->ip6_own_query);
1727 void br_multicast_stop(struct net_bridge *br)
1729 struct net_bridge_mdb_htable *mdb;
1730 struct net_bridge_mdb_entry *mp;
1731 struct hlist_node *n;
1735 del_timer_sync(&br->multicast_router_timer);
1736 del_timer_sync(&br->ip4_other_query.timer);
1737 del_timer_sync(&br->ip4_own_query.timer);
1738 #if IS_ENABLED(CONFIG_IPV6)
1739 del_timer_sync(&br->ip6_other_query.timer);
1740 del_timer_sync(&br->ip6_own_query.timer);
1743 spin_lock_bh(&br->multicast_lock);
1744 mdb = mlock_dereference(br->mdb, br);
1751 for (i = 0; i < mdb->max; i++) {
1752 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1754 del_timer(&mp->timer);
1755 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1760 spin_unlock_bh(&br->multicast_lock);
1762 spin_lock_bh(&br->multicast_lock);
1767 call_rcu_bh(&mdb->rcu, br_mdb_free);
1770 spin_unlock_bh(&br->multicast_lock);
1773 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1777 spin_lock_bh(&br->multicast_lock);
1778 if (!netif_running(br->dev))
1784 del_timer(&br->multicast_router_timer);
1787 br->multicast_router = val;
1797 spin_unlock_bh(&br->multicast_lock);
1802 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1804 struct net_bridge *br = p->br;
1807 spin_lock(&br->multicast_lock);
1808 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1815 p->multicast_router = val;
1818 if (val < 2 && !hlist_unhashed(&p->rlist))
1819 hlist_del_init_rcu(&p->rlist);
1824 del_timer(&p->multicast_router_timer);
1829 br_multicast_add_router(br, p);
1838 spin_unlock(&br->multicast_lock);
1843 static void br_multicast_start_querier(struct net_bridge *br,
1844 struct bridge_mcast_own_query *query)
1846 struct net_bridge_port *port;
1848 __br_multicast_open(br, query);
1850 list_for_each_entry(port, &br->port_list, list) {
1851 if (port->state == BR_STATE_DISABLED ||
1852 port->state == BR_STATE_BLOCKING)
1855 if (query == &br->ip4_own_query)
1856 br_multicast_enable(&port->ip4_own_query);
1857 #if IS_ENABLED(CONFIG_IPV6)
1859 br_multicast_enable(&port->ip6_own_query);
1864 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1867 struct net_bridge_mdb_htable *mdb;
1869 spin_lock_bh(&br->multicast_lock);
1870 if (br->multicast_disabled == !val)
1873 br->multicast_disabled = !val;
1874 if (br->multicast_disabled)
1877 if (!netif_running(br->dev))
1880 mdb = mlock_dereference(br->mdb, br);
1885 br->multicast_disabled = !!val;
1889 err = br_mdb_rehash(&br->mdb, mdb->max,
1890 br->hash_elasticity);
1895 br_multicast_start_querier(br, &br->ip4_own_query);
1896 #if IS_ENABLED(CONFIG_IPV6)
1897 br_multicast_start_querier(br, &br->ip6_own_query);
1901 spin_unlock_bh(&br->multicast_lock);
1906 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1908 unsigned long max_delay;
1912 spin_lock_bh(&br->multicast_lock);
1913 if (br->multicast_querier == val)
1916 br->multicast_querier = val;
1920 max_delay = br->multicast_query_response_interval;
1922 if (!timer_pending(&br->ip4_other_query.timer))
1923 br->ip4_other_query.delay_time = jiffies + max_delay;
1925 br_multicast_start_querier(br, &br->ip4_own_query);
1927 #if IS_ENABLED(CONFIG_IPV6)
1928 if (!timer_pending(&br->ip6_other_query.timer))
1929 br->ip6_other_query.delay_time = jiffies + max_delay;
1931 br_multicast_start_querier(br, &br->ip6_own_query);
1935 spin_unlock_bh(&br->multicast_lock);
1940 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1944 struct net_bridge_mdb_htable *mdb;
1946 spin_lock_bh(&br->multicast_lock);
1947 if (!netif_running(br->dev))
1951 if (!is_power_of_2(val))
1954 mdb = mlock_dereference(br->mdb, br);
1955 if (mdb && val < mdb->size)
1971 err = br_mdb_rehash(&br->mdb, br->hash_max,
1972 br->hash_elasticity);
1978 spin_unlock_bh(&br->multicast_lock);
1984 * br_multicast_list_adjacent - Returns snooped multicast addresses
1985 * @dev: The bridge port adjacent to which to retrieve addresses
1986 * @br_ip_list: The list to store found, snooped multicast IP addresses in
1988 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
1989 * snooping feature on all bridge ports of dev's bridge device, excluding
1990 * the addresses from dev itself.
1992 * Returns the number of items added to br_ip_list.
1995 * - br_ip_list needs to be initialized by caller
1996 * - br_ip_list might contain duplicates in the end
1997 * (needs to be taken care of by caller)
1998 * - br_ip_list needs to be freed by caller
2000 int br_multicast_list_adjacent(struct net_device *dev,
2001 struct list_head *br_ip_list)
2003 struct net_bridge *br;
2004 struct net_bridge_port *port;
2005 struct net_bridge_port_group *group;
2006 struct br_ip_list *entry;
2010 if (!br_ip_list || !br_port_exists(dev))
2013 port = br_port_get_rcu(dev);
2014 if (!port || !port->br)
2019 list_for_each_entry_rcu(port, &br->port_list, list) {
2020 if (!port->dev || port->dev == dev)
2023 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2024 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2028 entry->addr = group->addr;
2029 list_add(&entry->list, br_ip_list);
2038 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2041 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2042 * @dev: The bridge port providing the bridge on which to check for a querier
2043 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2045 * Checks whether the given interface has a bridge on top and if so returns
2046 * true if a valid querier exists anywhere on the bridged link layer.
2047 * Otherwise returns false.
2049 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2051 struct net_bridge *br;
2052 struct net_bridge_port *port;
2057 if (!br_port_exists(dev))
2060 port = br_port_get_rcu(dev);
2061 if (!port || !port->br)
2066 memset(ð, 0, sizeof(eth));
2067 eth.h_proto = htons(proto);
2069 ret = br_multicast_querier_exists(br, ð);
2075 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2078 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2079 * @dev: The bridge port adjacent to which to check for a querier
2080 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2082 * Checks whether the given interface has a bridge on top and if so returns
2083 * true if a selected querier is behind one of the other ports of this
2084 * bridge. Otherwise returns false.
2086 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2088 struct net_bridge *br;
2089 struct net_bridge_port *port;
2093 if (!br_port_exists(dev))
2096 port = br_port_get_rcu(dev);
2097 if (!port || !port->br)
2104 if (!timer_pending(&br->ip4_other_query.timer) ||
2105 rcu_dereference(br->ip4_querier.port) == port)
2108 #if IS_ENABLED(CONFIG_IPV6)
2110 if (!timer_pending(&br->ip6_other_query.timer) ||
2111 rcu_dereference(br->ip6_querier.port) == port)
2124 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);