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/if_ether.h>
15 #include <linux/igmp.h>
16 #include <linux/jhash.h>
17 #include <linux/kernel.h>
18 #include <linux/log2.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter_bridge.h>
21 #include <linux/random.h>
22 #include <linux/rculist.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
27 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
30 #include <net/addrconf.h>
33 #include "br_private.h"
35 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
36 static inline int ipv6_is_local_multicast(const struct in6_addr
*addr
)
38 if (ipv6_addr_is_multicast(addr
) &&
39 IPV6_ADDR_MC_SCOPE(addr
) <= IPV6_ADDR_SCOPE_LINKLOCAL
)
45 static inline int br_ip_equal(const struct br_ip
*a
, const struct br_ip
*b
)
47 if (a
->proto
!= b
->proto
)
51 return a
->u
.ip4
== b
->u
.ip4
;
52 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
53 case htons(ETH_P_IPV6
):
54 return ipv6_addr_equal(&a
->u
.ip6
, &b
->u
.ip6
);
60 static inline int __br_ip4_hash(struct net_bridge_mdb_htable
*mdb
, __be32 ip
)
62 return jhash_1word(mdb
->secret
, (__force u32
)ip
) & (mdb
->max
- 1);
65 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
66 static inline int __br_ip6_hash(struct net_bridge_mdb_htable
*mdb
,
67 const struct in6_addr
*ip
)
69 return jhash2((__force u32
*)ip
->s6_addr32
, 4, mdb
->secret
) & (mdb
->max
- 1);
73 static inline int br_ip_hash(struct net_bridge_mdb_htable
*mdb
,
78 return __br_ip4_hash(mdb
, ip
->u
.ip4
);
79 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
80 case htons(ETH_P_IPV6
):
81 return __br_ip6_hash(mdb
, &ip
->u
.ip6
);
87 static struct net_bridge_mdb_entry
*__br_mdb_ip_get(
88 struct net_bridge_mdb_htable
*mdb
, struct br_ip
*dst
, int hash
)
90 struct net_bridge_mdb_entry
*mp
;
93 hlist_for_each_entry_rcu(mp
, p
, &mdb
->mhash
[hash
], hlist
[mdb
->ver
]) {
94 if (br_ip_equal(&mp
->addr
, dst
))
101 static struct net_bridge_mdb_entry
*br_mdb_ip4_get(
102 struct net_bridge_mdb_htable
*mdb
, __be32 dst
)
107 br_dst
.proto
= htons(ETH_P_IP
);
109 return __br_mdb_ip_get(mdb
, &br_dst
, __br_ip4_hash(mdb
, dst
));
112 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
113 static struct net_bridge_mdb_entry
*br_mdb_ip6_get(
114 struct net_bridge_mdb_htable
*mdb
, const struct in6_addr
*dst
)
118 ipv6_addr_copy(&br_dst
.u
.ip6
, dst
);
119 br_dst
.proto
= htons(ETH_P_IPV6
);
121 return __br_mdb_ip_get(mdb
, &br_dst
, __br_ip6_hash(mdb
, dst
));
125 static struct net_bridge_mdb_entry
*br_mdb_ip_get(
126 struct net_bridge_mdb_htable
*mdb
, struct br_ip
*dst
)
128 return __br_mdb_ip_get(mdb
, dst
, br_ip_hash(mdb
, dst
));
131 struct net_bridge_mdb_entry
*br_mdb_get(struct net_bridge
*br
,
134 struct net_bridge_mdb_htable
*mdb
= br
->mdb
;
137 if (!mdb
|| br
->multicast_disabled
)
140 if (BR_INPUT_SKB_CB(skb
)->igmp
)
143 ip
.proto
= skb
->protocol
;
145 switch (skb
->protocol
) {
146 case htons(ETH_P_IP
):
147 ip
.u
.ip4
= ip_hdr(skb
)->daddr
;
149 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
150 case htons(ETH_P_IPV6
):
151 ipv6_addr_copy(&ip
.u
.ip6
, &ipv6_hdr(skb
)->daddr
);
158 return br_mdb_ip_get(mdb
, &ip
);
161 static void br_mdb_free(struct rcu_head
*head
)
163 struct net_bridge_mdb_htable
*mdb
=
164 container_of(head
, struct net_bridge_mdb_htable
, rcu
);
165 struct net_bridge_mdb_htable
*old
= mdb
->old
;
172 static int br_mdb_copy(struct net_bridge_mdb_htable
*new,
173 struct net_bridge_mdb_htable
*old
,
176 struct net_bridge_mdb_entry
*mp
;
177 struct hlist_node
*p
;
182 for (i
= 0; i
< old
->max
; i
++)
183 hlist_for_each_entry(mp
, p
, &old
->mhash
[i
], hlist
[old
->ver
])
184 hlist_add_head(&mp
->hlist
[new->ver
],
185 &new->mhash
[br_ip_hash(new, &mp
->addr
)]);
191 for (i
= 0; i
< new->max
; i
++) {
193 hlist_for_each_entry(mp
, p
, &new->mhash
[i
], hlist
[new->ver
])
199 return maxlen
> elasticity
? -EINVAL
: 0;
202 static void br_multicast_free_pg(struct rcu_head
*head
)
204 struct net_bridge_port_group
*p
=
205 container_of(head
, struct net_bridge_port_group
, rcu
);
210 static void br_multicast_free_group(struct rcu_head
*head
)
212 struct net_bridge_mdb_entry
*mp
=
213 container_of(head
, struct net_bridge_mdb_entry
, rcu
);
218 static void br_multicast_group_expired(unsigned long data
)
220 struct net_bridge_mdb_entry
*mp
= (void *)data
;
221 struct net_bridge
*br
= mp
->br
;
222 struct net_bridge_mdb_htable
*mdb
;
224 spin_lock(&br
->multicast_lock
);
225 if (!netif_running(br
->dev
) || timer_pending(&mp
->timer
))
228 if (!hlist_unhashed(&mp
->mglist
))
229 hlist_del_init(&mp
->mglist
);
235 hlist_del_rcu(&mp
->hlist
[mdb
->ver
]);
238 del_timer(&mp
->query_timer
);
239 call_rcu_bh(&mp
->rcu
, br_multicast_free_group
);
242 spin_unlock(&br
->multicast_lock
);
245 static void br_multicast_del_pg(struct net_bridge
*br
,
246 struct net_bridge_port_group
*pg
)
248 struct net_bridge_mdb_htable
*mdb
= br
->mdb
;
249 struct net_bridge_mdb_entry
*mp
;
250 struct net_bridge_port_group
*p
;
251 struct net_bridge_port_group
**pp
;
253 mp
= br_mdb_ip_get(mdb
, &pg
->addr
);
257 for (pp
= &mp
->ports
; (p
= *pp
); pp
= &p
->next
) {
262 hlist_del_init(&p
->mglist
);
263 del_timer(&p
->timer
);
264 del_timer(&p
->query_timer
);
265 call_rcu_bh(&p
->rcu
, br_multicast_free_pg
);
267 if (!mp
->ports
&& hlist_unhashed(&mp
->mglist
) &&
268 netif_running(br
->dev
))
269 mod_timer(&mp
->timer
, jiffies
);
277 static void br_multicast_port_group_expired(unsigned long data
)
279 struct net_bridge_port_group
*pg
= (void *)data
;
280 struct net_bridge
*br
= pg
->port
->br
;
282 spin_lock(&br
->multicast_lock
);
283 if (!netif_running(br
->dev
) || timer_pending(&pg
->timer
) ||
284 hlist_unhashed(&pg
->mglist
))
287 br_multicast_del_pg(br
, pg
);
290 spin_unlock(&br
->multicast_lock
);
293 static int br_mdb_rehash(struct net_bridge_mdb_htable
**mdbp
, int max
,
296 struct net_bridge_mdb_htable
*old
= *mdbp
;
297 struct net_bridge_mdb_htable
*mdb
;
300 mdb
= kmalloc(sizeof(*mdb
), GFP_ATOMIC
);
307 mdb
->mhash
= kzalloc(max
* sizeof(*mdb
->mhash
), GFP_ATOMIC
);
313 mdb
->size
= old
? old
->size
: 0;
314 mdb
->ver
= old
? old
->ver
^ 1 : 0;
316 if (!old
|| elasticity
)
317 get_random_bytes(&mdb
->secret
, sizeof(mdb
->secret
));
319 mdb
->secret
= old
->secret
;
324 err
= br_mdb_copy(mdb
, old
, elasticity
);
331 call_rcu_bh(&mdb
->rcu
, br_mdb_free
);
334 rcu_assign_pointer(*mdbp
, mdb
);
339 static struct sk_buff
*br_ip4_multicast_alloc_query(struct net_bridge
*br
,
347 skb
= netdev_alloc_skb_ip_align(br
->dev
, sizeof(*eth
) + sizeof(*iph
) +
352 skb
->protocol
= htons(ETH_P_IP
);
354 skb_reset_mac_header(skb
);
357 memcpy(eth
->h_source
, br
->dev
->dev_addr
, 6);
360 eth
->h_dest
[2] = 0x5e;
364 eth
->h_proto
= htons(ETH_P_IP
);
365 skb_put(skb
, sizeof(*eth
));
367 skb_set_network_header(skb
, skb
->len
);
373 iph
->tot_len
= htons(sizeof(*iph
) + sizeof(*ih
) + 4);
375 iph
->frag_off
= htons(IP_DF
);
377 iph
->protocol
= IPPROTO_IGMP
;
379 iph
->daddr
= htonl(INADDR_ALLHOSTS_GROUP
);
380 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
381 ((u8
*)&iph
[1])[1] = 4;
382 ((u8
*)&iph
[1])[2] = 0;
383 ((u8
*)&iph
[1])[3] = 0;
387 skb_set_transport_header(skb
, skb
->len
);
389 ih
->type
= IGMP_HOST_MEMBERSHIP_QUERY
;
390 ih
->code
= (group
? br
->multicast_last_member_interval
:
391 br
->multicast_query_response_interval
) /
392 (HZ
/ IGMP_TIMER_SCALE
);
395 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
396 skb_put(skb
, sizeof(*ih
));
398 __skb_pull(skb
, sizeof(*eth
));
404 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
405 static struct sk_buff
*br_ip6_multicast_alloc_query(struct net_bridge
*br
,
406 struct in6_addr
*group
)
409 struct ipv6hdr
*ip6h
;
410 struct mld_msg
*mldq
;
413 unsigned long interval
;
415 skb
= netdev_alloc_skb_ip_align(br
->dev
, sizeof(*eth
) + sizeof(*ip6h
) +
420 skb
->protocol
= htons(ETH_P_IPV6
);
422 /* Ethernet header */
423 skb_reset_mac_header(skb
);
426 memcpy(eth
->h_source
, br
->dev
->dev_addr
, 6);
427 ipv6_eth_mc_map(group
, eth
->h_dest
);
428 eth
->h_proto
= htons(ETH_P_IPV6
);
429 skb_put(skb
, sizeof(*eth
));
431 /* IPv6 header + HbH option */
432 skb_set_network_header(skb
, skb
->len
);
433 ip6h
= ipv6_hdr(skb
);
435 *(__force __be32
*)ip6h
= htonl(0x60000000);
436 ip6h
->payload_len
= 8 + sizeof(*mldq
);
437 ip6h
->nexthdr
= IPPROTO_HOPOPTS
;
439 ipv6_addr_set(&ip6h
->saddr
, 0, 0, 0, 0);
440 ipv6_addr_set(&ip6h
->daddr
, htonl(0xff020000), 0, 0, htonl(1));
442 hopopt
= (u8
*)(ip6h
+ 1);
443 hopopt
[0] = IPPROTO_ICMPV6
; /* next hdr */
444 hopopt
[1] = 0; /* length of HbH */
445 hopopt
[2] = IPV6_TLV_ROUTERALERT
; /* Router Alert */
446 hopopt
[3] = 2; /* Length of RA Option */
447 hopopt
[4] = 0; /* Type = 0x0000 (MLD) */
449 hopopt
[6] = IPV6_TLV_PAD0
; /* Pad0 */
450 hopopt
[7] = IPV6_TLV_PAD0
; /* Pad0 */
452 skb_put(skb
, sizeof(*ip6h
) + 8);
455 skb_set_transport_header(skb
, skb
->len
);
456 mldq
= (struct mld_msg
*) icmp6_hdr(skb
);
458 interval
= ipv6_addr_any(group
) ? br
->multicast_last_member_interval
:
459 br
->multicast_query_response_interval
;
461 mldq
->mld_type
= ICMPV6_MGM_QUERY
;
464 mldq
->mld_maxdelay
= htons((u16
)jiffies_to_msecs(interval
));
465 mldq
->mld_reserved
= 0;
466 ipv6_addr_copy(&mldq
->mld_mca
, group
);
469 mldq
->mld_cksum
= csum_ipv6_magic(&ip6h
->saddr
, &ip6h
->daddr
,
470 sizeof(*mldq
), IPPROTO_ICMPV6
,
473 skb_put(skb
, sizeof(*mldq
));
475 __skb_pull(skb
, sizeof(*eth
));
482 static struct sk_buff
*br_multicast_alloc_query(struct net_bridge
*br
,
485 switch (addr
->proto
) {
486 case htons(ETH_P_IP
):
487 return br_ip4_multicast_alloc_query(br
, addr
->u
.ip4
);
488 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
489 case htons(ETH_P_IPV6
):
490 return br_ip6_multicast_alloc_query(br
, &addr
->u
.ip6
);
496 static void br_multicast_send_group_query(struct net_bridge_mdb_entry
*mp
)
498 struct net_bridge
*br
= mp
->br
;
501 skb
= br_multicast_alloc_query(br
, &mp
->addr
);
508 if (++mp
->queries_sent
< br
->multicast_last_member_count
)
509 mod_timer(&mp
->query_timer
,
510 jiffies
+ br
->multicast_last_member_interval
);
513 static void br_multicast_group_query_expired(unsigned long data
)
515 struct net_bridge_mdb_entry
*mp
= (void *)data
;
516 struct net_bridge
*br
= mp
->br
;
518 spin_lock(&br
->multicast_lock
);
519 if (!netif_running(br
->dev
) || hlist_unhashed(&mp
->mglist
) ||
520 mp
->queries_sent
>= br
->multicast_last_member_count
)
523 br_multicast_send_group_query(mp
);
526 spin_unlock(&br
->multicast_lock
);
529 static void br_multicast_send_port_group_query(struct net_bridge_port_group
*pg
)
531 struct net_bridge_port
*port
= pg
->port
;
532 struct net_bridge
*br
= port
->br
;
535 skb
= br_multicast_alloc_query(br
, &pg
->addr
);
539 br_deliver(port
, skb
);
542 if (++pg
->queries_sent
< br
->multicast_last_member_count
)
543 mod_timer(&pg
->query_timer
,
544 jiffies
+ br
->multicast_last_member_interval
);
547 static void br_multicast_port_group_query_expired(unsigned long data
)
549 struct net_bridge_port_group
*pg
= (void *)data
;
550 struct net_bridge_port
*port
= pg
->port
;
551 struct net_bridge
*br
= port
->br
;
553 spin_lock(&br
->multicast_lock
);
554 if (!netif_running(br
->dev
) || hlist_unhashed(&pg
->mglist
) ||
555 pg
->queries_sent
>= br
->multicast_last_member_count
)
558 br_multicast_send_port_group_query(pg
);
561 spin_unlock(&br
->multicast_lock
);
564 static struct net_bridge_mdb_entry
*br_multicast_get_group(
565 struct net_bridge
*br
, struct net_bridge_port
*port
,
566 struct br_ip
*group
, int hash
)
568 struct net_bridge_mdb_htable
*mdb
= br
->mdb
;
569 struct net_bridge_mdb_entry
*mp
;
570 struct hlist_node
*p
;
576 hlist_for_each_entry(mp
, p
, &mdb
->mhash
[hash
], hlist
[mdb
->ver
]) {
578 if (unlikely(br_ip_equal(group
, &mp
->addr
)))
585 if (unlikely(count
> br
->hash_elasticity
&& count
)) {
587 printk(KERN_INFO
"%s: Multicast hash table "
588 "chain limit reached: %s\n",
589 br
->dev
->name
, port
? port
->dev
->name
:
592 elasticity
= br
->hash_elasticity
;
595 if (mdb
->size
>= max
) {
597 if (unlikely(max
>= br
->hash_max
)) {
598 printk(KERN_WARNING
"%s: Multicast hash table maximum "
599 "reached, disabling snooping: %s, %d\n",
600 br
->dev
->name
, port
? port
->dev
->name
:
605 br
->multicast_disabled
= 1;
610 if (max
> mdb
->max
|| elasticity
) {
613 printk(KERN_INFO
"%s: Multicast hash table "
615 br
->dev
->name
, port
? port
->dev
->name
:
621 err
= br_mdb_rehash(&br
->mdb
, max
, elasticity
);
623 printk(KERN_WARNING
"%s: Cannot rehash multicast "
624 "hash table, disabling snooping: "
626 br
->dev
->name
, port
? port
->dev
->name
:
643 static struct net_bridge_mdb_entry
*br_multicast_new_group(
644 struct net_bridge
*br
, struct net_bridge_port
*port
,
647 struct net_bridge_mdb_htable
*mdb
= br
->mdb
;
648 struct net_bridge_mdb_entry
*mp
;
652 if (br_mdb_rehash(&br
->mdb
, BR_HASH_SIZE
, 0))
657 hash
= br_ip_hash(mdb
, group
);
658 mp
= br_multicast_get_group(br
, port
, group
, hash
);
659 switch (PTR_ERR(mp
)) {
666 hash
= br_ip_hash(mdb
, group
);
673 mp
= kzalloc(sizeof(*mp
), GFP_ATOMIC
);
679 setup_timer(&mp
->timer
, br_multicast_group_expired
,
681 setup_timer(&mp
->query_timer
, br_multicast_group_query_expired
,
684 hlist_add_head_rcu(&mp
->hlist
[mdb
->ver
], &mdb
->mhash
[hash
]);
691 static int br_multicast_add_group(struct net_bridge
*br
,
692 struct net_bridge_port
*port
,
695 struct net_bridge_mdb_entry
*mp
;
696 struct net_bridge_port_group
*p
;
697 struct net_bridge_port_group
**pp
;
698 unsigned long now
= jiffies
;
701 spin_lock(&br
->multicast_lock
);
702 if (!netif_running(br
->dev
) ||
703 (port
&& port
->state
== BR_STATE_DISABLED
))
706 mp
= br_multicast_new_group(br
, port
, group
);
708 if (unlikely(IS_ERR(mp
) || !mp
))
712 hlist_add_head(&mp
->mglist
, &br
->mglist
);
713 mod_timer(&mp
->timer
, now
+ br
->multicast_membership_interval
);
717 for (pp
= &mp
->ports
; (p
= *pp
); pp
= &p
->next
) {
720 if ((unsigned long)p
->port
< (unsigned long)port
)
724 p
= kzalloc(sizeof(*p
), GFP_ATOMIC
);
732 hlist_add_head(&p
->mglist
, &port
->mglist
);
733 setup_timer(&p
->timer
, br_multicast_port_group_expired
,
735 setup_timer(&p
->query_timer
, br_multicast_port_group_query_expired
,
738 rcu_assign_pointer(*pp
, p
);
741 mod_timer(&p
->timer
, now
+ br
->multicast_membership_interval
);
746 spin_unlock(&br
->multicast_lock
);
750 static int br_ip4_multicast_add_group(struct net_bridge
*br
,
751 struct net_bridge_port
*port
,
754 struct br_ip br_group
;
756 if (ipv4_is_local_multicast(group
))
759 br_group
.u
.ip4
= group
;
760 br_group
.proto
= htons(ETH_P_IP
);
762 return br_multicast_add_group(br
, port
, &br_group
);
765 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
766 static int br_ip6_multicast_add_group(struct net_bridge
*br
,
767 struct net_bridge_port
*port
,
768 const struct in6_addr
*group
)
770 struct br_ip br_group
;
772 if (ipv6_is_local_multicast(group
))
775 ipv6_addr_copy(&br_group
.u
.ip6
, group
);
776 br_group
.proto
= htons(ETH_P_IP
);
778 return br_multicast_add_group(br
, port
, &br_group
);
782 static void br_multicast_router_expired(unsigned long data
)
784 struct net_bridge_port
*port
= (void *)data
;
785 struct net_bridge
*br
= port
->br
;
787 spin_lock(&br
->multicast_lock
);
788 if (port
->multicast_router
!= 1 ||
789 timer_pending(&port
->multicast_router_timer
) ||
790 hlist_unhashed(&port
->rlist
))
793 hlist_del_init_rcu(&port
->rlist
);
796 spin_unlock(&br
->multicast_lock
);
799 static void br_multicast_local_router_expired(unsigned long data
)
803 static void __br_multicast_send_query(struct net_bridge
*br
,
804 struct net_bridge_port
*port
,
809 skb
= br_multicast_alloc_query(br
, ip
);
814 __skb_push(skb
, sizeof(struct ethhdr
));
815 skb
->dev
= port
->dev
;
816 NF_HOOK(PF_BRIDGE
, NF_BR_LOCAL_OUT
, skb
, NULL
, skb
->dev
,
822 static void br_multicast_send_query(struct net_bridge
*br
,
823 struct net_bridge_port
*port
, u32 sent
)
826 struct br_ip br_group
;
828 if (!netif_running(br
->dev
) || br
->multicast_disabled
||
829 timer_pending(&br
->multicast_querier_timer
))
832 memset(&br_group
.u
, 0, sizeof(br_group
.u
));
834 br_group
.proto
= htons(ETH_P_IP
);
835 __br_multicast_send_query(br
, port
, &br_group
);
837 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
838 br_group
.proto
= htons(ETH_P_IPV6
);
839 __br_multicast_send_query(br
, port
, &br_group
);
843 time
+= sent
< br
->multicast_startup_query_count
?
844 br
->multicast_startup_query_interval
:
845 br
->multicast_query_interval
;
846 mod_timer(port
? &port
->multicast_query_timer
:
847 &br
->multicast_query_timer
, time
);
850 static void br_multicast_port_query_expired(unsigned long data
)
852 struct net_bridge_port
*port
= (void *)data
;
853 struct net_bridge
*br
= port
->br
;
855 spin_lock(&br
->multicast_lock
);
856 if (port
->state
== BR_STATE_DISABLED
||
857 port
->state
== BR_STATE_BLOCKING
)
860 if (port
->multicast_startup_queries_sent
<
861 br
->multicast_startup_query_count
)
862 port
->multicast_startup_queries_sent
++;
864 br_multicast_send_query(port
->br
, port
,
865 port
->multicast_startup_queries_sent
);
868 spin_unlock(&br
->multicast_lock
);
871 void br_multicast_add_port(struct net_bridge_port
*port
)
873 port
->multicast_router
= 1;
875 setup_timer(&port
->multicast_router_timer
, br_multicast_router_expired
,
876 (unsigned long)port
);
877 setup_timer(&port
->multicast_query_timer
,
878 br_multicast_port_query_expired
, (unsigned long)port
);
881 void br_multicast_del_port(struct net_bridge_port
*port
)
883 del_timer_sync(&port
->multicast_router_timer
);
886 static void __br_multicast_enable_port(struct net_bridge_port
*port
)
888 port
->multicast_startup_queries_sent
= 0;
890 if (try_to_del_timer_sync(&port
->multicast_query_timer
) >= 0 ||
891 del_timer(&port
->multicast_query_timer
))
892 mod_timer(&port
->multicast_query_timer
, jiffies
);
895 void br_multicast_enable_port(struct net_bridge_port
*port
)
897 struct net_bridge
*br
= port
->br
;
899 spin_lock(&br
->multicast_lock
);
900 if (br
->multicast_disabled
|| !netif_running(br
->dev
))
903 __br_multicast_enable_port(port
);
906 spin_unlock(&br
->multicast_lock
);
909 void br_multicast_disable_port(struct net_bridge_port
*port
)
911 struct net_bridge
*br
= port
->br
;
912 struct net_bridge_port_group
*pg
;
913 struct hlist_node
*p
, *n
;
915 spin_lock(&br
->multicast_lock
);
916 hlist_for_each_entry_safe(pg
, p
, n
, &port
->mglist
, mglist
)
917 br_multicast_del_pg(br
, pg
);
919 if (!hlist_unhashed(&port
->rlist
))
920 hlist_del_init_rcu(&port
->rlist
);
921 del_timer(&port
->multicast_router_timer
);
922 del_timer(&port
->multicast_query_timer
);
923 spin_unlock(&br
->multicast_lock
);
926 static int br_ip4_multicast_igmp3_report(struct net_bridge
*br
,
927 struct net_bridge_port
*port
,
930 struct igmpv3_report
*ih
;
931 struct igmpv3_grec
*grec
;
939 if (!pskb_may_pull(skb
, sizeof(*ih
)))
942 ih
= igmpv3_report_hdr(skb
);
943 num
= ntohs(ih
->ngrec
);
946 for (i
= 0; i
< num
; i
++) {
947 len
+= sizeof(*grec
);
948 if (!pskb_may_pull(skb
, len
))
951 grec
= (void *)(skb
->data
+ len
- sizeof(*grec
));
952 group
= grec
->grec_mca
;
953 type
= grec
->grec_type
;
955 len
+= ntohs(grec
->grec_nsrcs
) * 4;
956 if (!pskb_may_pull(skb
, len
))
959 /* We treat this as an IGMPv2 report for now. */
961 case IGMPV3_MODE_IS_INCLUDE
:
962 case IGMPV3_MODE_IS_EXCLUDE
:
963 case IGMPV3_CHANGE_TO_INCLUDE
:
964 case IGMPV3_CHANGE_TO_EXCLUDE
:
965 case IGMPV3_ALLOW_NEW_SOURCES
:
966 case IGMPV3_BLOCK_OLD_SOURCES
:
973 err
= br_ip4_multicast_add_group(br
, port
, group
);
981 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
982 static int br_ip6_multicast_mld2_report(struct net_bridge
*br
,
983 struct net_bridge_port
*port
,
986 struct icmp6hdr
*icmp6h
;
987 struct mld2_grec
*grec
;
993 if (!pskb_may_pull(skb
, sizeof(*icmp6h
)))
996 icmp6h
= icmp6_hdr(skb
);
997 num
= ntohs(icmp6h
->icmp6_dataun
.un_data16
[1]);
998 len
= sizeof(*icmp6h
);
1000 for (i
= 0; i
< num
; i
++) {
1001 __be16
*nsrcs
, _nsrcs
;
1003 nsrcs
= skb_header_pointer(skb
,
1004 len
+ offsetof(struct mld2_grec
,
1006 sizeof(_nsrcs
), &_nsrcs
);
1010 if (!pskb_may_pull(skb
,
1011 len
+ sizeof(*grec
) +
1012 sizeof(struct in6_addr
) * (*nsrcs
)))
1015 grec
= (struct mld2_grec
*)(skb
->data
+ len
);
1016 len
+= sizeof(*grec
) + sizeof(struct in6_addr
) * (*nsrcs
);
1018 /* We treat these as MLDv1 reports for now. */
1019 switch (grec
->grec_type
) {
1020 case MLD2_MODE_IS_INCLUDE
:
1021 case MLD2_MODE_IS_EXCLUDE
:
1022 case MLD2_CHANGE_TO_INCLUDE
:
1023 case MLD2_CHANGE_TO_EXCLUDE
:
1024 case MLD2_ALLOW_NEW_SOURCES
:
1025 case MLD2_BLOCK_OLD_SOURCES
:
1032 err
= br_ip6_multicast_add_group(br
, port
, &grec
->grec_mca
);
1041 static void br_multicast_add_router(struct net_bridge
*br
,
1042 struct net_bridge_port
*port
)
1044 struct hlist_node
*p
;
1045 struct hlist_node
**h
;
1047 for (h
= &br
->router_list
.first
;
1049 (unsigned long)container_of(p
, struct net_bridge_port
, rlist
) >
1050 (unsigned long)port
;
1054 port
->rlist
.pprev
= h
;
1055 port
->rlist
.next
= p
;
1056 rcu_assign_pointer(*h
, &port
->rlist
);
1058 p
->pprev
= &port
->rlist
.next
;
1061 static void br_multicast_mark_router(struct net_bridge
*br
,
1062 struct net_bridge_port
*port
)
1064 unsigned long now
= jiffies
;
1067 if (br
->multicast_router
== 1)
1068 mod_timer(&br
->multicast_router_timer
,
1069 now
+ br
->multicast_querier_interval
);
1073 if (port
->multicast_router
!= 1)
1076 if (!hlist_unhashed(&port
->rlist
))
1079 br_multicast_add_router(br
, port
);
1082 mod_timer(&port
->multicast_router_timer
,
1083 now
+ br
->multicast_querier_interval
);
1086 static void br_multicast_query_received(struct net_bridge
*br
,
1087 struct net_bridge_port
*port
,
1091 mod_timer(&br
->multicast_querier_timer
,
1092 jiffies
+ br
->multicast_querier_interval
);
1093 else if (timer_pending(&br
->multicast_querier_timer
))
1096 br_multicast_mark_router(br
, port
);
1099 static int br_ip4_multicast_query(struct net_bridge
*br
,
1100 struct net_bridge_port
*port
,
1101 struct sk_buff
*skb
)
1103 struct iphdr
*iph
= ip_hdr(skb
);
1104 struct igmphdr
*ih
= igmp_hdr(skb
);
1105 struct net_bridge_mdb_entry
*mp
;
1106 struct igmpv3_query
*ih3
;
1107 struct net_bridge_port_group
*p
;
1108 struct net_bridge_port_group
**pp
;
1109 unsigned long max_delay
;
1110 unsigned long now
= jiffies
;
1114 spin_lock(&br
->multicast_lock
);
1115 if (!netif_running(br
->dev
) ||
1116 (port
&& port
->state
== BR_STATE_DISABLED
))
1119 br_multicast_query_received(br
, port
, !!iph
->saddr
);
1123 if (skb
->len
== sizeof(*ih
)) {
1124 max_delay
= ih
->code
* (HZ
/ IGMP_TIMER_SCALE
);
1127 max_delay
= 10 * HZ
;
1131 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
))) {
1136 ih3
= igmpv3_query_hdr(skb
);
1140 max_delay
= ih3
->code
?
1141 IGMPV3_MRC(ih3
->code
) * (HZ
/ IGMP_TIMER_SCALE
) : 1;
1147 mp
= br_mdb_ip4_get(br
->mdb
, group
);
1151 max_delay
*= br
->multicast_last_member_count
;
1153 if (!hlist_unhashed(&mp
->mglist
) &&
1154 (timer_pending(&mp
->timer
) ?
1155 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1156 try_to_del_timer_sync(&mp
->timer
) >= 0))
1157 mod_timer(&mp
->timer
, now
+ max_delay
);
1159 for (pp
= &mp
->ports
; (p
= *pp
); pp
= &p
->next
) {
1160 if (timer_pending(&p
->timer
) ?
1161 time_after(p
->timer
.expires
, now
+ max_delay
) :
1162 try_to_del_timer_sync(&p
->timer
) >= 0)
1163 mod_timer(&mp
->timer
, now
+ max_delay
);
1167 spin_unlock(&br
->multicast_lock
);
1171 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1172 static int br_ip6_multicast_query(struct net_bridge
*br
,
1173 struct net_bridge_port
*port
,
1174 struct sk_buff
*skb
)
1176 struct ipv6hdr
*ip6h
= ipv6_hdr(skb
);
1177 struct mld_msg
*mld
= (struct mld_msg
*) icmp6_hdr(skb
);
1178 struct net_bridge_mdb_entry
*mp
;
1179 struct mld2_query
*mld2q
;
1180 struct net_bridge_port_group
*p
, **pp
;
1181 unsigned long max_delay
;
1182 unsigned long now
= jiffies
;
1183 struct in6_addr
*group
= NULL
;
1186 spin_lock(&br
->multicast_lock
);
1187 if (!netif_running(br
->dev
) ||
1188 (port
&& port
->state
== BR_STATE_DISABLED
))
1191 br_multicast_query_received(br
, port
, !ipv6_addr_any(&ip6h
->saddr
));
1193 if (skb
->len
== sizeof(*mld
)) {
1194 if (!pskb_may_pull(skb
, sizeof(*mld
))) {
1198 mld
= (struct mld_msg
*) icmp6_hdr(skb
);
1199 max_delay
= msecs_to_jiffies(htons(mld
->mld_maxdelay
));
1201 group
= &mld
->mld_mca
;
1202 } else if (skb
->len
>= sizeof(*mld2q
)) {
1203 if (!pskb_may_pull(skb
, sizeof(*mld2q
))) {
1207 mld2q
= (struct mld2_query
*)icmp6_hdr(skb
);
1208 if (!mld2q
->mld2q_nsrcs
)
1209 group
= &mld2q
->mld2q_mca
;
1210 max_delay
= mld2q
->mld2q_mrc
? MLDV2_MRC(mld2q
->mld2q_mrc
) : 1;
1216 mp
= br_mdb_ip6_get(br
->mdb
, group
);
1220 max_delay
*= br
->multicast_last_member_count
;
1221 if (!hlist_unhashed(&mp
->mglist
) &&
1222 (timer_pending(&mp
->timer
) ?
1223 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1224 try_to_del_timer_sync(&mp
->timer
) >= 0))
1225 mod_timer(&mp
->timer
, now
+ max_delay
);
1227 for (pp
= &mp
->ports
; (p
= *pp
); pp
= &p
->next
) {
1228 if (timer_pending(&p
->timer
) ?
1229 time_after(p
->timer
.expires
, now
+ max_delay
) :
1230 try_to_del_timer_sync(&p
->timer
) >= 0)
1231 mod_timer(&mp
->timer
, now
+ max_delay
);
1235 spin_unlock(&br
->multicast_lock
);
1240 static void br_multicast_leave_group(struct net_bridge
*br
,
1241 struct net_bridge_port
*port
,
1242 struct br_ip
*group
)
1244 struct net_bridge_mdb_htable
*mdb
;
1245 struct net_bridge_mdb_entry
*mp
;
1246 struct net_bridge_port_group
*p
;
1250 spin_lock(&br
->multicast_lock
);
1251 if (!netif_running(br
->dev
) ||
1252 (port
&& port
->state
== BR_STATE_DISABLED
) ||
1253 timer_pending(&br
->multicast_querier_timer
))
1257 mp
= br_mdb_ip_get(mdb
, group
);
1262 time
= now
+ br
->multicast_last_member_count
*
1263 br
->multicast_last_member_interval
;
1266 if (!hlist_unhashed(&mp
->mglist
) &&
1267 (timer_pending(&mp
->timer
) ?
1268 time_after(mp
->timer
.expires
, time
) :
1269 try_to_del_timer_sync(&mp
->timer
) >= 0)) {
1270 mod_timer(&mp
->timer
, time
);
1272 mp
->queries_sent
= 0;
1273 mod_timer(&mp
->query_timer
, now
);
1279 for (p
= mp
->ports
; p
; p
= p
->next
) {
1280 if (p
->port
!= port
)
1283 if (!hlist_unhashed(&p
->mglist
) &&
1284 (timer_pending(&p
->timer
) ?
1285 time_after(p
->timer
.expires
, time
) :
1286 try_to_del_timer_sync(&p
->timer
) >= 0)) {
1287 mod_timer(&p
->timer
, time
);
1289 p
->queries_sent
= 0;
1290 mod_timer(&p
->query_timer
, now
);
1297 spin_unlock(&br
->multicast_lock
);
1300 static void br_ip4_multicast_leave_group(struct net_bridge
*br
,
1301 struct net_bridge_port
*port
,
1304 struct br_ip br_group
;
1306 if (ipv4_is_local_multicast(group
))
1309 br_group
.u
.ip4
= group
;
1310 br_group
.proto
= htons(ETH_P_IP
);
1312 br_multicast_leave_group(br
, port
, &br_group
);
1315 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1316 static void br_ip6_multicast_leave_group(struct net_bridge
*br
,
1317 struct net_bridge_port
*port
,
1318 const struct in6_addr
*group
)
1320 struct br_ip br_group
;
1322 if (ipv6_is_local_multicast(group
))
1325 ipv6_addr_copy(&br_group
.u
.ip6
, group
);
1326 br_group
.proto
= htons(ETH_P_IPV6
);
1328 br_multicast_leave_group(br
, port
, &br_group
);
1332 static int br_multicast_ipv4_rcv(struct net_bridge
*br
,
1333 struct net_bridge_port
*port
,
1334 struct sk_buff
*skb
)
1336 struct sk_buff
*skb2
= skb
;
1343 /* We treat OOM as packet loss for now. */
1344 if (!pskb_may_pull(skb
, sizeof(*iph
)))
1349 if (iph
->ihl
< 5 || iph
->version
!= 4)
1352 if (!pskb_may_pull(skb
, ip_hdrlen(skb
)))
1357 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1360 if (iph
->protocol
!= IPPROTO_IGMP
)
1363 len
= ntohs(iph
->tot_len
);
1364 if (skb
->len
< len
|| len
< ip_hdrlen(skb
))
1367 if (skb
->len
> len
) {
1368 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1372 err
= pskb_trim_rcsum(skb2
, len
);
1377 len
-= ip_hdrlen(skb2
);
1378 offset
= skb_network_offset(skb2
) + ip_hdrlen(skb2
);
1379 __skb_pull(skb2
, offset
);
1380 skb_reset_transport_header(skb2
);
1383 if (!pskb_may_pull(skb2
, sizeof(*ih
)))
1386 switch (skb2
->ip_summed
) {
1387 case CHECKSUM_COMPLETE
:
1388 if (!csum_fold(skb2
->csum
))
1393 if (skb_checksum_complete(skb2
))
1399 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1400 ih
= igmp_hdr(skb2
);
1403 case IGMP_HOST_MEMBERSHIP_REPORT
:
1404 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1405 BR_INPUT_SKB_CB(skb2
)->mrouters_only
= 1;
1406 err
= br_ip4_multicast_add_group(br
, port
, ih
->group
);
1408 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1409 err
= br_ip4_multicast_igmp3_report(br
, port
, skb2
);
1411 case IGMP_HOST_MEMBERSHIP_QUERY
:
1412 err
= br_ip4_multicast_query(br
, port
, skb2
);
1414 case IGMP_HOST_LEAVE_MESSAGE
:
1415 br_ip4_multicast_leave_group(br
, port
, ih
->group
);
1420 __skb_push(skb2
, offset
);
1427 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1428 static int br_multicast_ipv6_rcv(struct net_bridge
*br
,
1429 struct net_bridge_port
*port
,
1430 struct sk_buff
*skb
)
1432 struct sk_buff
*skb2
= skb
;
1433 struct ipv6hdr
*ip6h
;
1434 struct icmp6hdr
*icmp6h
;
1440 if (!pskb_may_pull(skb
, sizeof(*ip6h
)))
1443 ip6h
= ipv6_hdr(skb
);
1446 * We're interested in MLD messages only.
1448 * - MLD has always Router Alert hop-by-hop option
1449 * - But we do not support jumbrograms.
1451 if (ip6h
->version
!= 6 ||
1452 ip6h
->nexthdr
!= IPPROTO_HOPOPTS
||
1453 ip6h
->payload_len
== 0)
1456 len
= ntohs(ip6h
->payload_len
);
1460 nexthdr
= ip6h
->nexthdr
;
1461 offset
= ipv6_skip_exthdr(skb
, sizeof(*ip6h
), &nexthdr
);
1463 if (offset
< 0 || nexthdr
!= IPPROTO_ICMPV6
)
1466 /* Okay, we found ICMPv6 header */
1467 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1471 len
-= offset
- skb_network_offset(skb2
);
1473 __skb_pull(skb2
, offset
);
1474 skb_reset_transport_header(skb2
);
1477 if (!pskb_may_pull(skb2
, sizeof(*icmp6h
)))
1480 icmp6h
= icmp6_hdr(skb2
);
1482 switch (icmp6h
->icmp6_type
) {
1483 case ICMPV6_MGM_QUERY
:
1484 case ICMPV6_MGM_REPORT
:
1485 case ICMPV6_MGM_REDUCTION
:
1486 case ICMPV6_MLD2_REPORT
:
1493 /* Okay, we found MLD message. Check further. */
1494 if (skb2
->len
> len
) {
1495 err
= pskb_trim_rcsum(skb2
, len
);
1500 switch (skb2
->ip_summed
) {
1501 case CHECKSUM_COMPLETE
:
1502 if (!csum_fold(skb2
->csum
))
1507 if (skb_checksum_complete(skb2
))
1513 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1515 switch (icmp6h
->icmp6_type
) {
1516 case ICMPV6_MGM_REPORT
:
1518 struct mld_msg
*mld
= (struct mld_msg
*)icmp6h
;
1519 BR_INPUT_SKB_CB(skb2
)->mrouters_only
= 1;
1520 err
= br_ip6_multicast_add_group(br
, port
, &mld
->mld_mca
);
1523 case ICMPV6_MLD2_REPORT
:
1524 err
= br_ip6_multicast_mld2_report(br
, port
, skb2
);
1526 case ICMPV6_MGM_QUERY
:
1527 err
= br_ip6_multicast_query(br
, port
, skb2
);
1529 case ICMPV6_MGM_REDUCTION
:
1531 struct mld_msg
*mld
= (struct mld_msg
*)icmp6h
;
1532 br_ip6_multicast_leave_group(br
, port
, &mld
->mld_mca
);
1537 __skb_push(skb2
, offset
);
1544 int br_multicast_rcv(struct net_bridge
*br
, struct net_bridge_port
*port
,
1545 struct sk_buff
*skb
)
1547 BR_INPUT_SKB_CB(skb
)->igmp
= 0;
1548 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 0;
1550 if (br
->multicast_disabled
)
1553 switch (skb
->protocol
) {
1554 case htons(ETH_P_IP
):
1555 return br_multicast_ipv4_rcv(br
, port
, skb
);
1556 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1557 case htons(ETH_P_IPV6
):
1558 return br_multicast_ipv6_rcv(br
, port
, skb
);
1565 static void br_multicast_query_expired(unsigned long data
)
1567 struct net_bridge
*br
= (void *)data
;
1569 spin_lock(&br
->multicast_lock
);
1570 if (br
->multicast_startup_queries_sent
<
1571 br
->multicast_startup_query_count
)
1572 br
->multicast_startup_queries_sent
++;
1574 br_multicast_send_query(br
, NULL
, br
->multicast_startup_queries_sent
);
1576 spin_unlock(&br
->multicast_lock
);
1579 void br_multicast_init(struct net_bridge
*br
)
1581 br
->hash_elasticity
= 4;
1584 br
->multicast_router
= 1;
1585 br
->multicast_last_member_count
= 2;
1586 br
->multicast_startup_query_count
= 2;
1588 br
->multicast_last_member_interval
= HZ
;
1589 br
->multicast_query_response_interval
= 10 * HZ
;
1590 br
->multicast_startup_query_interval
= 125 * HZ
/ 4;
1591 br
->multicast_query_interval
= 125 * HZ
;
1592 br
->multicast_querier_interval
= 255 * HZ
;
1593 br
->multicast_membership_interval
= 260 * HZ
;
1595 spin_lock_init(&br
->multicast_lock
);
1596 setup_timer(&br
->multicast_router_timer
,
1597 br_multicast_local_router_expired
, 0);
1598 setup_timer(&br
->multicast_querier_timer
,
1599 br_multicast_local_router_expired
, 0);
1600 setup_timer(&br
->multicast_query_timer
, br_multicast_query_expired
,
1604 void br_multicast_open(struct net_bridge
*br
)
1606 br
->multicast_startup_queries_sent
= 0;
1608 if (br
->multicast_disabled
)
1611 mod_timer(&br
->multicast_query_timer
, jiffies
);
1614 void br_multicast_stop(struct net_bridge
*br
)
1616 struct net_bridge_mdb_htable
*mdb
;
1617 struct net_bridge_mdb_entry
*mp
;
1618 struct hlist_node
*p
, *n
;
1622 del_timer_sync(&br
->multicast_router_timer
);
1623 del_timer_sync(&br
->multicast_querier_timer
);
1624 del_timer_sync(&br
->multicast_query_timer
);
1626 spin_lock_bh(&br
->multicast_lock
);
1634 for (i
= 0; i
< mdb
->max
; i
++) {
1635 hlist_for_each_entry_safe(mp
, p
, n
, &mdb
->mhash
[i
],
1637 del_timer(&mp
->timer
);
1638 del_timer(&mp
->query_timer
);
1639 call_rcu_bh(&mp
->rcu
, br_multicast_free_group
);
1644 spin_unlock_bh(&br
->multicast_lock
);
1646 spin_lock_bh(&br
->multicast_lock
);
1651 call_rcu_bh(&mdb
->rcu
, br_mdb_free
);
1654 spin_unlock_bh(&br
->multicast_lock
);
1657 int br_multicast_set_router(struct net_bridge
*br
, unsigned long val
)
1661 spin_lock_bh(&br
->multicast_lock
);
1662 if (!netif_running(br
->dev
))
1668 del_timer(&br
->multicast_router_timer
);
1671 br
->multicast_router
= val
;
1681 spin_unlock_bh(&br
->multicast_lock
);
1686 int br_multicast_set_port_router(struct net_bridge_port
*p
, unsigned long val
)
1688 struct net_bridge
*br
= p
->br
;
1691 spin_lock(&br
->multicast_lock
);
1692 if (!netif_running(br
->dev
) || p
->state
== BR_STATE_DISABLED
)
1699 p
->multicast_router
= val
;
1702 if (val
< 2 && !hlist_unhashed(&p
->rlist
))
1703 hlist_del_init_rcu(&p
->rlist
);
1708 del_timer(&p
->multicast_router_timer
);
1713 br_multicast_add_router(br
, p
);
1722 spin_unlock(&br
->multicast_lock
);
1727 int br_multicast_toggle(struct net_bridge
*br
, unsigned long val
)
1729 struct net_bridge_port
*port
;
1732 spin_lock(&br
->multicast_lock
);
1733 if (!netif_running(br
->dev
))
1737 if (br
->multicast_disabled
== !val
)
1740 br
->multicast_disabled
= !val
;
1741 if (br
->multicast_disabled
)
1748 br
->multicast_disabled
= !!val
;
1752 err
= br_mdb_rehash(&br
->mdb
, br
->mdb
->max
,
1753 br
->hash_elasticity
);
1758 br_multicast_open(br
);
1759 list_for_each_entry(port
, &br
->port_list
, list
) {
1760 if (port
->state
== BR_STATE_DISABLED
||
1761 port
->state
== BR_STATE_BLOCKING
)
1764 __br_multicast_enable_port(port
);
1768 spin_unlock(&br
->multicast_lock
);
1773 int br_multicast_set_hash_max(struct net_bridge
*br
, unsigned long val
)
1778 spin_lock(&br
->multicast_lock
);
1779 if (!netif_running(br
->dev
))
1783 if (!is_power_of_2(val
))
1785 if (br
->mdb
&& val
< br
->mdb
->size
)
1801 err
= br_mdb_rehash(&br
->mdb
, br
->hash_max
,
1802 br
->hash_elasticity
);
1808 spin_unlock(&br
->multicast_lock
);