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 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,
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,
52 unsigned int br_mdb_rehash_seq;
54 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
56 if (a->proto != b->proto)
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);
71 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
74 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
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,
82 return jhash_2words(ipv6_addr_hash(ip), vid,
83 mdb->secret) & (mdb->max - 1);
87 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
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);
101 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
102 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
104 struct net_bridge_mdb_entry *mp;
106 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
107 if (br_ip_equal(&mp->addr, dst))
114 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
120 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
123 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
124 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
129 br_dst.proto = htons(ETH_P_IP);
132 return br_mdb_ip_get(mdb, &br_dst);
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,
143 br_dst.proto = htons(ETH_P_IPV6);
146 return br_mdb_ip_get(mdb, &br_dst);
150 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
151 struct sk_buff *skb, u16 vid)
153 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
156 if (br->multicast_disabled)
159 if (BR_INPUT_SKB_CB(skb)->igmp)
162 ip.proto = skb->protocol;
165 switch (skb->protocol) {
166 case htons(ETH_P_IP):
167 ip.u.ip4 = ip_hdr(skb)->daddr;
169 #if IS_ENABLED(CONFIG_IPV6)
170 case htons(ETH_P_IPV6):
171 ip.u.ip6 = ipv6_hdr(skb)->daddr;
178 return br_mdb_ip_get(mdb, &ip);
181 static void br_mdb_free(struct rcu_head *head)
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;
192 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
193 struct net_bridge_mdb_htable *old,
196 struct net_bridge_mdb_entry *mp;
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)]);
210 for (i = 0; i < new->max; i++) {
212 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
218 return maxlen > elasticity ? -EINVAL : 0;
221 void br_multicast_free_pg(struct rcu_head *head)
223 struct net_bridge_port_group *p =
224 container_of(head, struct net_bridge_port_group, rcu);
229 static void br_multicast_free_group(struct rcu_head *head)
231 struct net_bridge_mdb_entry *mp =
232 container_of(head, struct net_bridge_mdb_entry, rcu);
237 static void br_multicast_group_expired(unsigned long data)
239 struct net_bridge_mdb_entry *mp = (void *)data;
240 struct net_bridge *br = mp->br;
241 struct net_bridge_mdb_htable *mdb;
243 spin_lock(&br->multicast_lock);
244 if (!netif_running(br->dev) || timer_pending(&mp->timer))
252 mdb = mlock_dereference(br->mdb, br);
254 hlist_del_rcu(&mp->hlist[mdb->ver]);
257 call_rcu_bh(&mp->rcu, br_multicast_free_group);
260 spin_unlock(&br->multicast_lock);
263 static void br_multicast_del_pg(struct net_bridge *br,
264 struct net_bridge_port_group *pg)
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;
271 mdb = mlock_dereference(br->mdb, br);
273 mp = br_mdb_ip_get(mdb, &pg->addr);
277 for (pp = &mp->ports;
278 (p = mlock_dereference(*pp, br)) != NULL;
283 rcu_assign_pointer(*pp, p->next);
284 hlist_del_init(&p->mglist);
285 del_timer(&p->timer);
286 call_rcu_bh(&p->rcu, br_multicast_free_pg);
288 if (!mp->ports && !mp->mglist &&
289 netif_running(br->dev))
290 mod_timer(&mp->timer, jiffies);
298 static void br_multicast_port_group_expired(unsigned long data)
300 struct net_bridge_port_group *pg = (void *)data;
301 struct net_bridge *br = pg->port->br;
303 spin_lock(&br->multicast_lock);
304 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
305 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
308 br_multicast_del_pg(br, pg);
311 spin_unlock(&br->multicast_lock);
314 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
317 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
318 struct net_bridge_mdb_htable *mdb;
321 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
328 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
334 mdb->size = old ? old->size : 0;
335 mdb->ver = old ? old->ver ^ 1 : 0;
337 if (!old || elasticity)
338 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
340 mdb->secret = old->secret;
345 err = br_mdb_copy(mdb, old, elasticity);
353 call_rcu_bh(&mdb->rcu, br_mdb_free);
356 rcu_assign_pointer(*mdbp, mdb);
361 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
369 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
374 skb->protocol = htons(ETH_P_IP);
376 skb_reset_mac_header(skb);
379 ether_addr_copy(eth->h_source, br->dev->dev_addr);
382 eth->h_dest[2] = 0x5e;
386 eth->h_proto = htons(ETH_P_IP);
387 skb_put(skb, sizeof(*eth));
389 skb_set_network_header(skb, skb->len);
395 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
397 iph->frag_off = htons(IP_DF);
399 iph->protocol = IPPROTO_IGMP;
400 iph->saddr = br->multicast_query_use_ifaddr ?
401 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
402 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
403 ((u8 *)&iph[1])[0] = IPOPT_RA;
404 ((u8 *)&iph[1])[1] = 4;
405 ((u8 *)&iph[1])[2] = 0;
406 ((u8 *)&iph[1])[3] = 0;
410 skb_set_transport_header(skb, skb->len);
412 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
413 ih->code = (group ? br->multicast_last_member_interval :
414 br->multicast_query_response_interval) /
415 (HZ / IGMP_TIMER_SCALE);
418 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
419 skb_put(skb, sizeof(*ih));
421 __skb_pull(skb, sizeof(*eth));
427 #if IS_ENABLED(CONFIG_IPV6)
428 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
429 const struct in6_addr *group)
432 struct ipv6hdr *ip6h;
433 struct mld_msg *mldq;
436 unsigned long interval;
438 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
443 skb->protocol = htons(ETH_P_IPV6);
445 /* Ethernet header */
446 skb_reset_mac_header(skb);
449 ether_addr_copy(eth->h_source, br->dev->dev_addr);
450 eth->h_proto = htons(ETH_P_IPV6);
451 skb_put(skb, sizeof(*eth));
453 /* IPv6 header + HbH option */
454 skb_set_network_header(skb, skb->len);
455 ip6h = ipv6_hdr(skb);
457 *(__force __be32 *)ip6h = htonl(0x60000000);
458 ip6h->payload_len = htons(8 + sizeof(*mldq));
459 ip6h->nexthdr = IPPROTO_HOPOPTS;
461 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
462 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
467 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
469 hopopt = (u8 *)(ip6h + 1);
470 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
471 hopopt[1] = 0; /* length of HbH */
472 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
473 hopopt[3] = 2; /* Length of RA Option */
474 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
476 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
477 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
479 skb_put(skb, sizeof(*ip6h) + 8);
482 skb_set_transport_header(skb, skb->len);
483 mldq = (struct mld_msg *) icmp6_hdr(skb);
485 interval = ipv6_addr_any(group) ?
486 br->multicast_query_response_interval :
487 br->multicast_last_member_interval;
489 mldq->mld_type = ICMPV6_MGM_QUERY;
492 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
493 mldq->mld_reserved = 0;
494 mldq->mld_mca = *group;
497 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
498 sizeof(*mldq), IPPROTO_ICMPV6,
501 skb_put(skb, sizeof(*mldq));
503 __skb_pull(skb, sizeof(*eth));
510 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
513 switch (addr->proto) {
514 case htons(ETH_P_IP):
515 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
516 #if IS_ENABLED(CONFIG_IPV6)
517 case htons(ETH_P_IPV6):
518 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
524 static struct net_bridge_mdb_entry *br_multicast_get_group(
525 struct net_bridge *br, struct net_bridge_port *port,
526 struct br_ip *group, int hash)
528 struct net_bridge_mdb_htable *mdb;
529 struct net_bridge_mdb_entry *mp;
530 unsigned int count = 0;
535 mdb = rcu_dereference_protected(br->mdb, 1);
536 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
538 if (unlikely(br_ip_equal(group, &mp->addr)))
545 if (unlikely(count > br->hash_elasticity && count)) {
547 br_info(br, "Multicast hash table "
548 "chain limit reached: %s\n",
549 port ? port->dev->name : br->dev->name);
551 elasticity = br->hash_elasticity;
554 if (mdb->size >= max) {
556 if (unlikely(max > br->hash_max)) {
557 br_warn(br, "Multicast hash table maximum of %d "
558 "reached, disabling snooping: %s\n",
560 port ? port->dev->name : br->dev->name);
563 br->multicast_disabled = 1;
568 if (max > mdb->max || elasticity) {
571 br_info(br, "Multicast hash table "
573 port ? port->dev->name : br->dev->name);
578 err = br_mdb_rehash(&br->mdb, max, elasticity);
580 br_warn(br, "Cannot rehash multicast "
581 "hash table, disabling snooping: %s, %d, %d\n",
582 port ? port->dev->name : br->dev->name,
598 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
599 struct net_bridge_port *port, struct br_ip *group)
601 struct net_bridge_mdb_htable *mdb;
602 struct net_bridge_mdb_entry *mp;
606 mdb = rcu_dereference_protected(br->mdb, 1);
608 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
614 hash = br_ip_hash(mdb, group);
615 mp = br_multicast_get_group(br, port, group, hash);
616 switch (PTR_ERR(mp)) {
622 mdb = rcu_dereference_protected(br->mdb, 1);
623 hash = br_ip_hash(mdb, group);
630 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
632 return ERR_PTR(-ENOMEM);
636 setup_timer(&mp->timer, br_multicast_group_expired,
639 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
646 struct net_bridge_port_group *br_multicast_new_port_group(
647 struct net_bridge_port *port,
649 struct net_bridge_port_group __rcu *next,
652 struct net_bridge_port_group *p;
654 p = kzalloc(sizeof(*p), GFP_ATOMIC);
661 rcu_assign_pointer(p->next, next);
662 hlist_add_head(&p->mglist, &port->mglist);
663 setup_timer(&p->timer, br_multicast_port_group_expired,
668 static int br_multicast_add_group(struct net_bridge *br,
669 struct net_bridge_port *port,
672 struct net_bridge_mdb_entry *mp;
673 struct net_bridge_port_group *p;
674 struct net_bridge_port_group __rcu **pp;
675 unsigned long now = jiffies;
678 spin_lock(&br->multicast_lock);
679 if (!netif_running(br->dev) ||
680 (port && port->state == BR_STATE_DISABLED))
683 mp = br_multicast_new_group(br, port, group);
690 mod_timer(&mp->timer, now + br->multicast_membership_interval);
694 for (pp = &mp->ports;
695 (p = mlock_dereference(*pp, br)) != NULL;
699 if ((unsigned long)p->port < (unsigned long)port)
703 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
706 rcu_assign_pointer(*pp, p);
707 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
710 mod_timer(&p->timer, now + br->multicast_membership_interval);
715 spin_unlock(&br->multicast_lock);
719 static int br_ip4_multicast_add_group(struct net_bridge *br,
720 struct net_bridge_port *port,
724 struct br_ip br_group;
726 if (ipv4_is_local_multicast(group))
729 br_group.u.ip4 = group;
730 br_group.proto = htons(ETH_P_IP);
733 return br_multicast_add_group(br, port, &br_group);
736 #if IS_ENABLED(CONFIG_IPV6)
737 static int br_ip6_multicast_add_group(struct net_bridge *br,
738 struct net_bridge_port *port,
739 const struct in6_addr *group,
742 struct br_ip br_group;
744 if (ipv6_addr_is_ll_all_nodes(group))
747 br_group.u.ip6 = *group;
748 br_group.proto = htons(ETH_P_IPV6);
751 return br_multicast_add_group(br, port, &br_group);
755 static void br_multicast_router_expired(unsigned long data)
757 struct net_bridge_port *port = (void *)data;
758 struct net_bridge *br = port->br;
760 spin_lock(&br->multicast_lock);
761 if (port->multicast_router != 1 ||
762 timer_pending(&port->multicast_router_timer) ||
763 hlist_unhashed(&port->rlist))
766 hlist_del_init_rcu(&port->rlist);
769 spin_unlock(&br->multicast_lock);
772 static void br_multicast_local_router_expired(unsigned long data)
776 static void br_multicast_querier_expired(struct net_bridge *br,
777 struct bridge_mcast_own_query *query)
779 spin_lock(&br->multicast_lock);
780 if (!netif_running(br->dev) || br->multicast_disabled)
783 br_multicast_start_querier(br, query);
786 spin_unlock(&br->multicast_lock);
789 static void br_ip4_multicast_querier_expired(unsigned long data)
791 struct net_bridge *br = (void *)data;
793 br_multicast_querier_expired(br, &br->ip4_own_query);
796 #if IS_ENABLED(CONFIG_IPV6)
797 static void br_ip6_multicast_querier_expired(unsigned long data)
799 struct net_bridge *br = (void *)data;
801 br_multicast_querier_expired(br, &br->ip6_own_query);
805 static void br_multicast_select_own_querier(struct net_bridge *br,
809 if (ip->proto == htons(ETH_P_IP))
810 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
811 #if IS_ENABLED(CONFIG_IPV6)
813 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
817 static void __br_multicast_send_query(struct net_bridge *br,
818 struct net_bridge_port *port,
823 skb = br_multicast_alloc_query(br, ip);
828 skb->dev = port->dev;
829 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, NULL, skb,
831 br_dev_queue_push_xmit);
833 br_multicast_select_own_querier(br, ip, skb);
838 static void br_multicast_send_query(struct net_bridge *br,
839 struct net_bridge_port *port,
840 struct bridge_mcast_own_query *own_query)
843 struct br_ip br_group;
844 struct bridge_mcast_other_query *other_query = NULL;
846 if (!netif_running(br->dev) || br->multicast_disabled ||
847 !br->multicast_querier)
850 memset(&br_group.u, 0, sizeof(br_group.u));
852 if (port ? (own_query == &port->ip4_own_query) :
853 (own_query == &br->ip4_own_query)) {
854 other_query = &br->ip4_other_query;
855 br_group.proto = htons(ETH_P_IP);
856 #if IS_ENABLED(CONFIG_IPV6)
858 other_query = &br->ip6_other_query;
859 br_group.proto = htons(ETH_P_IPV6);
863 if (!other_query || timer_pending(&other_query->timer))
866 __br_multicast_send_query(br, port, &br_group);
869 time += own_query->startup_sent < br->multicast_startup_query_count ?
870 br->multicast_startup_query_interval :
871 br->multicast_query_interval;
872 mod_timer(&own_query->timer, time);
876 br_multicast_port_query_expired(struct net_bridge_port *port,
877 struct bridge_mcast_own_query *query)
879 struct net_bridge *br = port->br;
881 spin_lock(&br->multicast_lock);
882 if (port->state == BR_STATE_DISABLED ||
883 port->state == BR_STATE_BLOCKING)
886 if (query->startup_sent < br->multicast_startup_query_count)
887 query->startup_sent++;
889 br_multicast_send_query(port->br, port, query);
892 spin_unlock(&br->multicast_lock);
895 static void br_ip4_multicast_port_query_expired(unsigned long data)
897 struct net_bridge_port *port = (void *)data;
899 br_multicast_port_query_expired(port, &port->ip4_own_query);
902 #if IS_ENABLED(CONFIG_IPV6)
903 static void br_ip6_multicast_port_query_expired(unsigned long data)
905 struct net_bridge_port *port = (void *)data;
907 br_multicast_port_query_expired(port, &port->ip6_own_query);
911 void br_multicast_add_port(struct net_bridge_port *port)
913 port->multicast_router = 1;
915 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
916 (unsigned long)port);
917 setup_timer(&port->ip4_own_query.timer,
918 br_ip4_multicast_port_query_expired, (unsigned long)port);
919 #if IS_ENABLED(CONFIG_IPV6)
920 setup_timer(&port->ip6_own_query.timer,
921 br_ip6_multicast_port_query_expired, (unsigned long)port);
925 void br_multicast_del_port(struct net_bridge_port *port)
927 del_timer_sync(&port->multicast_router_timer);
930 static void br_multicast_enable(struct bridge_mcast_own_query *query)
932 query->startup_sent = 0;
934 if (try_to_del_timer_sync(&query->timer) >= 0 ||
935 del_timer(&query->timer))
936 mod_timer(&query->timer, jiffies);
939 void br_multicast_enable_port(struct net_bridge_port *port)
941 struct net_bridge *br = port->br;
943 spin_lock(&br->multicast_lock);
944 if (br->multicast_disabled || !netif_running(br->dev))
947 br_multicast_enable(&port->ip4_own_query);
948 #if IS_ENABLED(CONFIG_IPV6)
949 br_multicast_enable(&port->ip6_own_query);
951 if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
952 br_multicast_add_router(br, port);
955 spin_unlock(&br->multicast_lock);
958 void br_multicast_disable_port(struct net_bridge_port *port)
960 struct net_bridge *br = port->br;
961 struct net_bridge_port_group *pg;
962 struct hlist_node *n;
964 spin_lock(&br->multicast_lock);
965 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
966 br_multicast_del_pg(br, pg);
968 if (!hlist_unhashed(&port->rlist))
969 hlist_del_init_rcu(&port->rlist);
970 del_timer(&port->multicast_router_timer);
971 del_timer(&port->ip4_own_query.timer);
972 #if IS_ENABLED(CONFIG_IPV6)
973 del_timer(&port->ip6_own_query.timer);
975 spin_unlock(&br->multicast_lock);
978 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
979 struct net_bridge_port *port,
983 struct igmpv3_report *ih;
984 struct igmpv3_grec *grec;
992 ih = igmpv3_report_hdr(skb);
993 num = ntohs(ih->ngrec);
996 for (i = 0; i < num; i++) {
997 len += sizeof(*grec);
998 if (!pskb_may_pull(skb, len))
1001 grec = (void *)(skb->data + len - sizeof(*grec));
1002 group = grec->grec_mca;
1003 type = grec->grec_type;
1005 len += ntohs(grec->grec_nsrcs) * 4;
1006 if (!pskb_may_pull(skb, len))
1009 /* We treat this as an IGMPv2 report for now. */
1011 case IGMPV3_MODE_IS_INCLUDE:
1012 case IGMPV3_MODE_IS_EXCLUDE:
1013 case IGMPV3_CHANGE_TO_INCLUDE:
1014 case IGMPV3_CHANGE_TO_EXCLUDE:
1015 case IGMPV3_ALLOW_NEW_SOURCES:
1016 case IGMPV3_BLOCK_OLD_SOURCES:
1023 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1024 type == IGMPV3_MODE_IS_INCLUDE) &&
1025 ntohs(grec->grec_nsrcs) == 0) {
1026 br_ip4_multicast_leave_group(br, port, group, vid);
1028 err = br_ip4_multicast_add_group(br, port, group, vid);
1037 #if IS_ENABLED(CONFIG_IPV6)
1038 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1039 struct net_bridge_port *port,
1040 struct sk_buff *skb,
1043 struct icmp6hdr *icmp6h;
1044 struct mld2_grec *grec;
1050 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1053 icmp6h = icmp6_hdr(skb);
1054 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1055 len = sizeof(*icmp6h);
1057 for (i = 0; i < num; i++) {
1058 __be16 *nsrcs, _nsrcs;
1060 nsrcs = skb_header_pointer(skb,
1061 len + offsetof(struct mld2_grec,
1063 sizeof(_nsrcs), &_nsrcs);
1067 if (!pskb_may_pull(skb,
1068 len + sizeof(*grec) +
1069 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1072 grec = (struct mld2_grec *)(skb->data + len);
1073 len += sizeof(*grec) +
1074 sizeof(struct in6_addr) * ntohs(*nsrcs);
1076 /* We treat these as MLDv1 reports for now. */
1077 switch (grec->grec_type) {
1078 case MLD2_MODE_IS_INCLUDE:
1079 case MLD2_MODE_IS_EXCLUDE:
1080 case MLD2_CHANGE_TO_INCLUDE:
1081 case MLD2_CHANGE_TO_EXCLUDE:
1082 case MLD2_ALLOW_NEW_SOURCES:
1083 case MLD2_BLOCK_OLD_SOURCES:
1090 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1091 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1092 ntohs(*nsrcs) == 0) {
1093 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1096 err = br_ip6_multicast_add_group(br, port,
1097 &grec->grec_mca, vid);
1107 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1108 struct net_bridge_port *port,
1111 if (!timer_pending(&br->ip4_own_query.timer) &&
1112 !timer_pending(&br->ip4_other_query.timer))
1115 if (!br->ip4_querier.addr.u.ip4)
1118 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1124 br->ip4_querier.addr.u.ip4 = saddr;
1126 /* update protected by general multicast_lock by caller */
1127 rcu_assign_pointer(br->ip4_querier.port, port);
1132 #if IS_ENABLED(CONFIG_IPV6)
1133 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1134 struct net_bridge_port *port,
1135 struct in6_addr *saddr)
1137 if (!timer_pending(&br->ip6_own_query.timer) &&
1138 !timer_pending(&br->ip6_other_query.timer))
1141 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1147 br->ip6_querier.addr.u.ip6 = *saddr;
1149 /* update protected by general multicast_lock by caller */
1150 rcu_assign_pointer(br->ip6_querier.port, port);
1156 static bool br_multicast_select_querier(struct net_bridge *br,
1157 struct net_bridge_port *port,
1158 struct br_ip *saddr)
1160 switch (saddr->proto) {
1161 case htons(ETH_P_IP):
1162 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1163 #if IS_ENABLED(CONFIG_IPV6)
1164 case htons(ETH_P_IPV6):
1165 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1173 br_multicast_update_query_timer(struct net_bridge *br,
1174 struct bridge_mcast_other_query *query,
1175 unsigned long max_delay)
1177 if (!timer_pending(&query->timer))
1178 query->delay_time = jiffies + max_delay;
1180 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1184 * Add port to router_list
1185 * list is maintained ordered by pointer value
1186 * and locked by br->multicast_lock and RCU
1188 static void br_multicast_add_router(struct net_bridge *br,
1189 struct net_bridge_port *port)
1191 struct net_bridge_port *p;
1192 struct hlist_node *slot = NULL;
1194 if (!hlist_unhashed(&port->rlist))
1197 hlist_for_each_entry(p, &br->router_list, rlist) {
1198 if ((unsigned long) port >= (unsigned long) p)
1204 hlist_add_behind_rcu(&port->rlist, slot);
1206 hlist_add_head_rcu(&port->rlist, &br->router_list);
1209 static void br_multicast_mark_router(struct net_bridge *br,
1210 struct net_bridge_port *port)
1212 unsigned long now = jiffies;
1215 if (br->multicast_router == 1)
1216 mod_timer(&br->multicast_router_timer,
1217 now + br->multicast_querier_interval);
1221 if (port->multicast_router != 1)
1224 br_multicast_add_router(br, port);
1226 mod_timer(&port->multicast_router_timer,
1227 now + br->multicast_querier_interval);
1230 static void br_multicast_query_received(struct net_bridge *br,
1231 struct net_bridge_port *port,
1232 struct bridge_mcast_other_query *query,
1233 struct br_ip *saddr,
1234 unsigned long max_delay)
1236 if (!br_multicast_select_querier(br, port, saddr))
1239 br_multicast_update_query_timer(br, query, max_delay);
1240 br_multicast_mark_router(br, port);
1243 static int br_ip4_multicast_query(struct net_bridge *br,
1244 struct net_bridge_port *port,
1245 struct sk_buff *skb,
1248 const struct iphdr *iph = ip_hdr(skb);
1249 struct igmphdr *ih = igmp_hdr(skb);
1250 struct net_bridge_mdb_entry *mp;
1251 struct igmpv3_query *ih3;
1252 struct net_bridge_port_group *p;
1253 struct net_bridge_port_group __rcu **pp;
1255 unsigned long max_delay;
1256 unsigned long now = jiffies;
1260 spin_lock(&br->multicast_lock);
1261 if (!netif_running(br->dev) ||
1262 (port && port->state == BR_STATE_DISABLED))
1267 if (skb->len == sizeof(*ih)) {
1268 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1271 max_delay = 10 * HZ;
1274 } else if (skb->len >= sizeof(*ih3)) {
1275 ih3 = igmpv3_query_hdr(skb);
1279 max_delay = ih3->code ?
1280 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1286 saddr.proto = htons(ETH_P_IP);
1287 saddr.u.ip4 = iph->saddr;
1289 br_multicast_query_received(br, port, &br->ip4_other_query,
1294 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1298 max_delay *= br->multicast_last_member_count;
1301 (timer_pending(&mp->timer) ?
1302 time_after(mp->timer.expires, now + max_delay) :
1303 try_to_del_timer_sync(&mp->timer) >= 0))
1304 mod_timer(&mp->timer, now + max_delay);
1306 for (pp = &mp->ports;
1307 (p = mlock_dereference(*pp, br)) != NULL;
1309 if (timer_pending(&p->timer) ?
1310 time_after(p->timer.expires, now + max_delay) :
1311 try_to_del_timer_sync(&p->timer) >= 0)
1312 mod_timer(&p->timer, now + max_delay);
1316 spin_unlock(&br->multicast_lock);
1320 #if IS_ENABLED(CONFIG_IPV6)
1321 static int br_ip6_multicast_query(struct net_bridge *br,
1322 struct net_bridge_port *port,
1323 struct sk_buff *skb,
1326 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1327 struct mld_msg *mld;
1328 struct net_bridge_mdb_entry *mp;
1329 struct mld2_query *mld2q;
1330 struct net_bridge_port_group *p;
1331 struct net_bridge_port_group __rcu **pp;
1333 unsigned long max_delay;
1334 unsigned long now = jiffies;
1335 const struct in6_addr *group = NULL;
1336 bool is_general_query;
1339 spin_lock(&br->multicast_lock);
1340 if (!netif_running(br->dev) ||
1341 (port && port->state == BR_STATE_DISABLED))
1344 if (skb->len == sizeof(*mld)) {
1345 if (!pskb_may_pull(skb, sizeof(*mld))) {
1349 mld = (struct mld_msg *) icmp6_hdr(skb);
1350 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1352 group = &mld->mld_mca;
1354 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1358 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1359 if (!mld2q->mld2q_nsrcs)
1360 group = &mld2q->mld2q_mca;
1362 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1365 is_general_query = group && ipv6_addr_any(group);
1367 if (is_general_query) {
1368 saddr.proto = htons(ETH_P_IPV6);
1369 saddr.u.ip6 = ip6h->saddr;
1371 br_multicast_query_received(br, port, &br->ip6_other_query,
1374 } else if (!group) {
1378 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1382 max_delay *= br->multicast_last_member_count;
1384 (timer_pending(&mp->timer) ?
1385 time_after(mp->timer.expires, now + max_delay) :
1386 try_to_del_timer_sync(&mp->timer) >= 0))
1387 mod_timer(&mp->timer, now + max_delay);
1389 for (pp = &mp->ports;
1390 (p = mlock_dereference(*pp, br)) != NULL;
1392 if (timer_pending(&p->timer) ?
1393 time_after(p->timer.expires, now + max_delay) :
1394 try_to_del_timer_sync(&p->timer) >= 0)
1395 mod_timer(&p->timer, now + max_delay);
1399 spin_unlock(&br->multicast_lock);
1405 br_multicast_leave_group(struct net_bridge *br,
1406 struct net_bridge_port *port,
1407 struct br_ip *group,
1408 struct bridge_mcast_other_query *other_query,
1409 struct bridge_mcast_own_query *own_query)
1411 struct net_bridge_mdb_htable *mdb;
1412 struct net_bridge_mdb_entry *mp;
1413 struct net_bridge_port_group *p;
1417 spin_lock(&br->multicast_lock);
1418 if (!netif_running(br->dev) ||
1419 (port && port->state == BR_STATE_DISABLED))
1422 mdb = mlock_dereference(br->mdb, br);
1423 mp = br_mdb_ip_get(mdb, group);
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);
1449 if (timer_pending(&other_query->timer))
1452 if (br->multicast_querier) {
1453 __br_multicast_send_query(br, port, &mp->addr);
1455 time = jiffies + br->multicast_last_member_count *
1456 br->multicast_last_member_interval;
1458 mod_timer(&own_query->timer, time);
1460 for (p = mlock_dereference(mp->ports, br);
1462 p = mlock_dereference(p->next, br)) {
1463 if (p->port != port)
1466 if (!hlist_unhashed(&p->mglist) &&
1467 (timer_pending(&p->timer) ?
1468 time_after(p->timer.expires, time) :
1469 try_to_del_timer_sync(&p->timer) >= 0)) {
1470 mod_timer(&p->timer, time);
1478 time = now + br->multicast_last_member_count *
1479 br->multicast_last_member_interval;
1483 (timer_pending(&mp->timer) ?
1484 time_after(mp->timer.expires, time) :
1485 try_to_del_timer_sync(&mp->timer) >= 0)) {
1486 mod_timer(&mp->timer, time);
1492 for (p = mlock_dereference(mp->ports, br);
1494 p = mlock_dereference(p->next, br)) {
1495 if (p->port != port)
1498 if (!hlist_unhashed(&p->mglist) &&
1499 (timer_pending(&p->timer) ?
1500 time_after(p->timer.expires, time) :
1501 try_to_del_timer_sync(&p->timer) >= 0)) {
1502 mod_timer(&p->timer, time);
1508 spin_unlock(&br->multicast_lock);
1511 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1512 struct net_bridge_port *port,
1516 struct br_ip br_group;
1517 struct bridge_mcast_own_query *own_query;
1519 if (ipv4_is_local_multicast(group))
1522 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1524 br_group.u.ip4 = group;
1525 br_group.proto = htons(ETH_P_IP);
1528 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1532 #if IS_ENABLED(CONFIG_IPV6)
1533 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1534 struct net_bridge_port *port,
1535 const struct in6_addr *group,
1538 struct br_ip br_group;
1539 struct bridge_mcast_own_query *own_query;
1541 if (ipv6_addr_is_ll_all_nodes(group))
1544 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1546 br_group.u.ip6 = *group;
1547 br_group.proto = htons(ETH_P_IPV6);
1550 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1555 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1556 struct net_bridge_port *port,
1557 struct sk_buff *skb,
1560 struct sk_buff *skb_trimmed = NULL;
1564 err = ip_mc_check_igmp(skb, &skb_trimmed);
1566 if (err == -ENOMSG) {
1567 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1568 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1570 } else if (err < 0) {
1574 BR_INPUT_SKB_CB(skb)->igmp = 1;
1578 case IGMP_HOST_MEMBERSHIP_REPORT:
1579 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1580 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1581 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1583 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1584 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1586 case IGMP_HOST_MEMBERSHIP_QUERY:
1587 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1589 case IGMP_HOST_LEAVE_MESSAGE:
1590 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1595 kfree_skb(skb_trimmed);
1600 #if IS_ENABLED(CONFIG_IPV6)
1601 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1602 struct net_bridge_port *port,
1603 struct sk_buff *skb,
1606 struct sk_buff *skb_trimmed = NULL;
1607 struct mld_msg *mld;
1610 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1612 if (err == -ENOMSG) {
1613 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1614 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1616 } else if (err < 0) {
1620 BR_INPUT_SKB_CB(skb)->igmp = 1;
1621 mld = (struct mld_msg *)skb_transport_header(skb);
1623 switch (mld->mld_type) {
1624 case ICMPV6_MGM_REPORT:
1625 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1626 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1628 case ICMPV6_MLD2_REPORT:
1629 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1631 case ICMPV6_MGM_QUERY:
1632 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1634 case ICMPV6_MGM_REDUCTION:
1635 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1640 kfree_skb(skb_trimmed);
1646 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1647 struct sk_buff *skb, u16 vid)
1649 BR_INPUT_SKB_CB(skb)->igmp = 0;
1650 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1652 if (br->multicast_disabled)
1655 switch (skb->protocol) {
1656 case htons(ETH_P_IP):
1657 return br_multicast_ipv4_rcv(br, port, skb, vid);
1658 #if IS_ENABLED(CONFIG_IPV6)
1659 case htons(ETH_P_IPV6):
1660 return br_multicast_ipv6_rcv(br, port, skb, vid);
1667 static void br_multicast_query_expired(struct net_bridge *br,
1668 struct bridge_mcast_own_query *query,
1669 struct bridge_mcast_querier *querier)
1671 spin_lock(&br->multicast_lock);
1672 if (query->startup_sent < br->multicast_startup_query_count)
1673 query->startup_sent++;
1675 RCU_INIT_POINTER(querier->port, NULL);
1676 br_multicast_send_query(br, NULL, query);
1677 spin_unlock(&br->multicast_lock);
1680 static void br_ip4_multicast_query_expired(unsigned long data)
1682 struct net_bridge *br = (void *)data;
1684 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1687 #if IS_ENABLED(CONFIG_IPV6)
1688 static void br_ip6_multicast_query_expired(unsigned long data)
1690 struct net_bridge *br = (void *)data;
1692 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1696 void br_multicast_init(struct net_bridge *br)
1698 br->hash_elasticity = 4;
1701 br->multicast_router = 1;
1702 br->multicast_querier = 0;
1703 br->multicast_query_use_ifaddr = 0;
1704 br->multicast_last_member_count = 2;
1705 br->multicast_startup_query_count = 2;
1707 br->multicast_last_member_interval = HZ;
1708 br->multicast_query_response_interval = 10 * HZ;
1709 br->multicast_startup_query_interval = 125 * HZ / 4;
1710 br->multicast_query_interval = 125 * HZ;
1711 br->multicast_querier_interval = 255 * HZ;
1712 br->multicast_membership_interval = 260 * HZ;
1714 br->ip4_other_query.delay_time = 0;
1715 br->ip4_querier.port = NULL;
1716 #if IS_ENABLED(CONFIG_IPV6)
1717 br->ip6_other_query.delay_time = 0;
1718 br->ip6_querier.port = NULL;
1721 spin_lock_init(&br->multicast_lock);
1722 setup_timer(&br->multicast_router_timer,
1723 br_multicast_local_router_expired, 0);
1724 setup_timer(&br->ip4_other_query.timer,
1725 br_ip4_multicast_querier_expired, (unsigned long)br);
1726 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1728 #if IS_ENABLED(CONFIG_IPV6)
1729 setup_timer(&br->ip6_other_query.timer,
1730 br_ip6_multicast_querier_expired, (unsigned long)br);
1731 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1736 static void __br_multicast_open(struct net_bridge *br,
1737 struct bridge_mcast_own_query *query)
1739 query->startup_sent = 0;
1741 if (br->multicast_disabled)
1744 mod_timer(&query->timer, jiffies);
1747 void br_multicast_open(struct net_bridge *br)
1749 __br_multicast_open(br, &br->ip4_own_query);
1750 #if IS_ENABLED(CONFIG_IPV6)
1751 __br_multicast_open(br, &br->ip6_own_query);
1755 void br_multicast_stop(struct net_bridge *br)
1757 struct net_bridge_mdb_htable *mdb;
1758 struct net_bridge_mdb_entry *mp;
1759 struct hlist_node *n;
1763 del_timer_sync(&br->multicast_router_timer);
1764 del_timer_sync(&br->ip4_other_query.timer);
1765 del_timer_sync(&br->ip4_own_query.timer);
1766 #if IS_ENABLED(CONFIG_IPV6)
1767 del_timer_sync(&br->ip6_other_query.timer);
1768 del_timer_sync(&br->ip6_own_query.timer);
1771 spin_lock_bh(&br->multicast_lock);
1772 mdb = mlock_dereference(br->mdb, br);
1779 for (i = 0; i < mdb->max; i++) {
1780 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1782 del_timer(&mp->timer);
1783 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1788 spin_unlock_bh(&br->multicast_lock);
1790 spin_lock_bh(&br->multicast_lock);
1795 call_rcu_bh(&mdb->rcu, br_mdb_free);
1798 spin_unlock_bh(&br->multicast_lock);
1801 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1805 spin_lock_bh(&br->multicast_lock);
1810 del_timer(&br->multicast_router_timer);
1813 br->multicast_router = val;
1818 spin_unlock_bh(&br->multicast_lock);
1823 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1825 struct net_bridge *br = p->br;
1828 spin_lock(&br->multicast_lock);
1834 p->multicast_router = val;
1837 if (val < 2 && !hlist_unhashed(&p->rlist))
1838 hlist_del_init_rcu(&p->rlist);
1843 del_timer(&p->multicast_router_timer);
1848 br_multicast_add_router(br, p);
1852 spin_unlock(&br->multicast_lock);
1857 static void br_multicast_start_querier(struct net_bridge *br,
1858 struct bridge_mcast_own_query *query)
1860 struct net_bridge_port *port;
1862 __br_multicast_open(br, query);
1864 list_for_each_entry(port, &br->port_list, list) {
1865 if (port->state == BR_STATE_DISABLED ||
1866 port->state == BR_STATE_BLOCKING)
1869 if (query == &br->ip4_own_query)
1870 br_multicast_enable(&port->ip4_own_query);
1871 #if IS_ENABLED(CONFIG_IPV6)
1873 br_multicast_enable(&port->ip6_own_query);
1878 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1881 struct net_bridge_mdb_htable *mdb;
1883 spin_lock_bh(&br->multicast_lock);
1884 if (br->multicast_disabled == !val)
1887 br->multicast_disabled = !val;
1888 if (br->multicast_disabled)
1891 if (!netif_running(br->dev))
1894 mdb = mlock_dereference(br->mdb, br);
1899 br->multicast_disabled = !!val;
1903 err = br_mdb_rehash(&br->mdb, mdb->max,
1904 br->hash_elasticity);
1909 br_multicast_start_querier(br, &br->ip4_own_query);
1910 #if IS_ENABLED(CONFIG_IPV6)
1911 br_multicast_start_querier(br, &br->ip6_own_query);
1915 spin_unlock_bh(&br->multicast_lock);
1920 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1922 unsigned long max_delay;
1926 spin_lock_bh(&br->multicast_lock);
1927 if (br->multicast_querier == val)
1930 br->multicast_querier = val;
1934 max_delay = br->multicast_query_response_interval;
1936 if (!timer_pending(&br->ip4_other_query.timer))
1937 br->ip4_other_query.delay_time = jiffies + max_delay;
1939 br_multicast_start_querier(br, &br->ip4_own_query);
1941 #if IS_ENABLED(CONFIG_IPV6)
1942 if (!timer_pending(&br->ip6_other_query.timer))
1943 br->ip6_other_query.delay_time = jiffies + max_delay;
1945 br_multicast_start_querier(br, &br->ip6_own_query);
1949 spin_unlock_bh(&br->multicast_lock);
1954 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1958 struct net_bridge_mdb_htable *mdb;
1960 spin_lock_bh(&br->multicast_lock);
1961 if (!is_power_of_2(val))
1964 mdb = mlock_dereference(br->mdb, br);
1965 if (mdb && val < mdb->size)
1981 err = br_mdb_rehash(&br->mdb, br->hash_max,
1982 br->hash_elasticity);
1988 spin_unlock_bh(&br->multicast_lock);
1994 * br_multicast_list_adjacent - Returns snooped multicast addresses
1995 * @dev: The bridge port adjacent to which to retrieve addresses
1996 * @br_ip_list: The list to store found, snooped multicast IP addresses in
1998 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
1999 * snooping feature on all bridge ports of dev's bridge device, excluding
2000 * the addresses from dev itself.
2002 * Returns the number of items added to br_ip_list.
2005 * - br_ip_list needs to be initialized by caller
2006 * - br_ip_list might contain duplicates in the end
2007 * (needs to be taken care of by caller)
2008 * - br_ip_list needs to be freed by caller
2010 int br_multicast_list_adjacent(struct net_device *dev,
2011 struct list_head *br_ip_list)
2013 struct net_bridge *br;
2014 struct net_bridge_port *port;
2015 struct net_bridge_port_group *group;
2016 struct br_ip_list *entry;
2020 if (!br_ip_list || !br_port_exists(dev))
2023 port = br_port_get_rcu(dev);
2024 if (!port || !port->br)
2029 list_for_each_entry_rcu(port, &br->port_list, list) {
2030 if (!port->dev || port->dev == dev)
2033 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2034 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2038 entry->addr = group->addr;
2039 list_add(&entry->list, br_ip_list);
2048 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2051 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2052 * @dev: The bridge port providing the bridge on which to check for a querier
2053 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2055 * Checks whether the given interface has a bridge on top and if so returns
2056 * true if a valid querier exists anywhere on the bridged link layer.
2057 * Otherwise returns false.
2059 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2061 struct net_bridge *br;
2062 struct net_bridge_port *port;
2067 if (!br_port_exists(dev))
2070 port = br_port_get_rcu(dev);
2071 if (!port || !port->br)
2076 memset(ð, 0, sizeof(eth));
2077 eth.h_proto = htons(proto);
2079 ret = br_multicast_querier_exists(br, ð);
2085 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2088 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2089 * @dev: The bridge port adjacent to which to check for a querier
2090 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2092 * Checks whether the given interface has a bridge on top and if so returns
2093 * true if a selected querier is behind one of the other ports of this
2094 * bridge. Otherwise returns false.
2096 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2098 struct net_bridge *br;
2099 struct net_bridge_port *port;
2103 if (!br_port_exists(dev))
2106 port = br_port_get_rcu(dev);
2107 if (!port || !port->br)
2114 if (!timer_pending(&br->ip4_other_query.timer) ||
2115 rcu_dereference(br->ip4_querier.port) == port)
2118 #if IS_ENABLED(CONFIG_IPV6)
2120 if (!timer_pending(&br->ip6_other_query.timer) ||
2121 rcu_dereference(br->ip6_querier.port) == port)
2134 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);