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 IS_ENABLED(CONFIG_IPV6)
30 #include <net/ip6_checksum.h>
33 #include "br_private.h"
35 static void br_multicast_start_querier(struct net_bridge
*br
);
36 unsigned int br_mdb_rehash_seq
;
38 static inline int br_ip_equal(const struct br_ip
*a
, const struct br_ip
*b
)
40 if (a
->proto
!= b
->proto
)
46 return a
->u
.ip4
== b
->u
.ip4
;
47 #if IS_ENABLED(CONFIG_IPV6)
48 case htons(ETH_P_IPV6
):
49 return ipv6_addr_equal(&a
->u
.ip6
, &b
->u
.ip6
);
55 static inline int __br_ip4_hash(struct net_bridge_mdb_htable
*mdb
, __be32 ip
,
58 return jhash_2words((__force u32
)ip
, vid
, mdb
->secret
) & (mdb
->max
- 1);
61 #if IS_ENABLED(CONFIG_IPV6)
62 static inline int __br_ip6_hash(struct net_bridge_mdb_htable
*mdb
,
63 const struct in6_addr
*ip
,
66 return jhash_2words(ipv6_addr_hash(ip
), vid
,
67 mdb
->secret
) & (mdb
->max
- 1);
71 static inline int br_ip_hash(struct net_bridge_mdb_htable
*mdb
,
76 return __br_ip4_hash(mdb
, ip
->u
.ip4
, ip
->vid
);
77 #if IS_ENABLED(CONFIG_IPV6)
78 case htons(ETH_P_IPV6
):
79 return __br_ip6_hash(mdb
, &ip
->u
.ip6
, ip
->vid
);
85 static struct net_bridge_mdb_entry
*__br_mdb_ip_get(
86 struct net_bridge_mdb_htable
*mdb
, struct br_ip
*dst
, int hash
)
88 struct net_bridge_mdb_entry
*mp
;
91 hlist_for_each_entry_rcu(mp
, p
, &mdb
->mhash
[hash
], hlist
[mdb
->ver
]) {
92 if (br_ip_equal(&mp
->addr
, dst
))
99 struct net_bridge_mdb_entry
*br_mdb_ip_get(struct net_bridge_mdb_htable
*mdb
,
105 return __br_mdb_ip_get(mdb
, dst
, br_ip_hash(mdb
, dst
));
108 static struct net_bridge_mdb_entry
*br_mdb_ip4_get(
109 struct net_bridge_mdb_htable
*mdb
, __be32 dst
, __u16 vid
)
114 br_dst
.proto
= htons(ETH_P_IP
);
117 return br_mdb_ip_get(mdb
, &br_dst
);
120 #if IS_ENABLED(CONFIG_IPV6)
121 static struct net_bridge_mdb_entry
*br_mdb_ip6_get(
122 struct net_bridge_mdb_htable
*mdb
, const struct in6_addr
*dst
,
128 br_dst
.proto
= htons(ETH_P_IPV6
);
131 return br_mdb_ip_get(mdb
, &br_dst
);
135 struct net_bridge_mdb_entry
*br_mdb_get(struct net_bridge
*br
,
138 struct net_bridge_mdb_htable
*mdb
= rcu_dereference(br
->mdb
);
141 if (br
->multicast_disabled
)
144 if (BR_INPUT_SKB_CB(skb
)->igmp
)
147 ip
.proto
= skb
->protocol
;
149 switch (skb
->protocol
) {
150 case htons(ETH_P_IP
):
151 ip
.u
.ip4
= ip_hdr(skb
)->daddr
;
153 #if IS_ENABLED(CONFIG_IPV6)
154 case htons(ETH_P_IPV6
):
155 ip
.u
.ip6
= ipv6_hdr(skb
)->daddr
;
162 return br_mdb_ip_get(mdb
, &ip
);
165 static void br_mdb_free(struct rcu_head
*head
)
167 struct net_bridge_mdb_htable
*mdb
=
168 container_of(head
, struct net_bridge_mdb_htable
, rcu
);
169 struct net_bridge_mdb_htable
*old
= mdb
->old
;
176 static int br_mdb_copy(struct net_bridge_mdb_htable
*new,
177 struct net_bridge_mdb_htable
*old
,
180 struct net_bridge_mdb_entry
*mp
;
181 struct hlist_node
*p
;
186 for (i
= 0; i
< old
->max
; i
++)
187 hlist_for_each_entry(mp
, p
, &old
->mhash
[i
], hlist
[old
->ver
])
188 hlist_add_head(&mp
->hlist
[new->ver
],
189 &new->mhash
[br_ip_hash(new, &mp
->addr
)]);
195 for (i
= 0; i
< new->max
; i
++) {
197 hlist_for_each_entry(mp
, p
, &new->mhash
[i
], hlist
[new->ver
])
203 return maxlen
> elasticity
? -EINVAL
: 0;
206 void br_multicast_free_pg(struct rcu_head
*head
)
208 struct net_bridge_port_group
*p
=
209 container_of(head
, struct net_bridge_port_group
, rcu
);
214 static void br_multicast_free_group(struct rcu_head
*head
)
216 struct net_bridge_mdb_entry
*mp
=
217 container_of(head
, struct net_bridge_mdb_entry
, rcu
);
222 static void br_multicast_group_expired(unsigned long data
)
224 struct net_bridge_mdb_entry
*mp
= (void *)data
;
225 struct net_bridge
*br
= mp
->br
;
226 struct net_bridge_mdb_htable
*mdb
;
228 spin_lock(&br
->multicast_lock
);
229 if (!netif_running(br
->dev
) || timer_pending(&mp
->timer
))
237 mdb
= mlock_dereference(br
->mdb
, br
);
239 hlist_del_rcu(&mp
->hlist
[mdb
->ver
]);
242 call_rcu_bh(&mp
->rcu
, br_multicast_free_group
);
245 spin_unlock(&br
->multicast_lock
);
248 static void br_multicast_del_pg(struct net_bridge
*br
,
249 struct net_bridge_port_group
*pg
)
251 struct net_bridge_mdb_htable
*mdb
;
252 struct net_bridge_mdb_entry
*mp
;
253 struct net_bridge_port_group
*p
;
254 struct net_bridge_port_group __rcu
**pp
;
256 mdb
= mlock_dereference(br
->mdb
, br
);
258 mp
= br_mdb_ip_get(mdb
, &pg
->addr
);
262 for (pp
= &mp
->ports
;
263 (p
= mlock_dereference(*pp
, br
)) != NULL
;
268 rcu_assign_pointer(*pp
, p
->next
);
269 hlist_del_init(&p
->mglist
);
270 del_timer(&p
->timer
);
271 call_rcu_bh(&p
->rcu
, br_multicast_free_pg
);
273 if (!mp
->ports
&& !mp
->mglist
&&
274 netif_running(br
->dev
))
275 mod_timer(&mp
->timer
, jiffies
);
283 static void br_multicast_port_group_expired(unsigned long data
)
285 struct net_bridge_port_group
*pg
= (void *)data
;
286 struct net_bridge
*br
= pg
->port
->br
;
288 spin_lock(&br
->multicast_lock
);
289 if (!netif_running(br
->dev
) || timer_pending(&pg
->timer
) ||
290 hlist_unhashed(&pg
->mglist
) || pg
->state
& MDB_PERMANENT
)
293 br_multicast_del_pg(br
, pg
);
296 spin_unlock(&br
->multicast_lock
);
299 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu
**mdbp
, int max
,
302 struct net_bridge_mdb_htable
*old
= rcu_dereference_protected(*mdbp
, 1);
303 struct net_bridge_mdb_htable
*mdb
;
306 mdb
= kmalloc(sizeof(*mdb
), GFP_ATOMIC
);
313 mdb
->mhash
= kzalloc(max
* sizeof(*mdb
->mhash
), GFP_ATOMIC
);
319 mdb
->size
= old
? old
->size
: 0;
320 mdb
->ver
= old
? old
->ver
^ 1 : 0;
322 if (!old
|| elasticity
)
323 get_random_bytes(&mdb
->secret
, sizeof(mdb
->secret
));
325 mdb
->secret
= old
->secret
;
330 err
= br_mdb_copy(mdb
, old
, elasticity
);
338 call_rcu_bh(&mdb
->rcu
, br_mdb_free
);
341 rcu_assign_pointer(*mdbp
, mdb
);
346 static struct sk_buff
*br_ip4_multicast_alloc_query(struct net_bridge
*br
,
354 skb
= netdev_alloc_skb_ip_align(br
->dev
, sizeof(*eth
) + sizeof(*iph
) +
359 skb
->protocol
= htons(ETH_P_IP
);
361 skb_reset_mac_header(skb
);
364 memcpy(eth
->h_source
, br
->dev
->dev_addr
, 6);
367 eth
->h_dest
[2] = 0x5e;
371 eth
->h_proto
= htons(ETH_P_IP
);
372 skb_put(skb
, sizeof(*eth
));
374 skb_set_network_header(skb
, skb
->len
);
380 iph
->tot_len
= htons(sizeof(*iph
) + sizeof(*ih
) + 4);
382 iph
->frag_off
= htons(IP_DF
);
384 iph
->protocol
= IPPROTO_IGMP
;
386 iph
->daddr
= htonl(INADDR_ALLHOSTS_GROUP
);
387 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
388 ((u8
*)&iph
[1])[1] = 4;
389 ((u8
*)&iph
[1])[2] = 0;
390 ((u8
*)&iph
[1])[3] = 0;
394 skb_set_transport_header(skb
, skb
->len
);
396 ih
->type
= IGMP_HOST_MEMBERSHIP_QUERY
;
397 ih
->code
= (group
? br
->multicast_last_member_interval
:
398 br
->multicast_query_response_interval
) /
399 (HZ
/ IGMP_TIMER_SCALE
);
402 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
403 skb_put(skb
, sizeof(*ih
));
405 __skb_pull(skb
, sizeof(*eth
));
411 #if IS_ENABLED(CONFIG_IPV6)
412 static struct sk_buff
*br_ip6_multicast_alloc_query(struct net_bridge
*br
,
413 const struct in6_addr
*group
)
416 struct ipv6hdr
*ip6h
;
417 struct mld_msg
*mldq
;
420 unsigned long interval
;
422 skb
= netdev_alloc_skb_ip_align(br
->dev
, sizeof(*eth
) + sizeof(*ip6h
) +
427 skb
->protocol
= htons(ETH_P_IPV6
);
429 /* Ethernet header */
430 skb_reset_mac_header(skb
);
433 memcpy(eth
->h_source
, br
->dev
->dev_addr
, 6);
434 eth
->h_proto
= htons(ETH_P_IPV6
);
435 skb_put(skb
, sizeof(*eth
));
437 /* IPv6 header + HbH option */
438 skb_set_network_header(skb
, skb
->len
);
439 ip6h
= ipv6_hdr(skb
);
441 *(__force __be32
*)ip6h
= htonl(0x60000000);
442 ip6h
->payload_len
= htons(8 + sizeof(*mldq
));
443 ip6h
->nexthdr
= IPPROTO_HOPOPTS
;
445 ipv6_addr_set(&ip6h
->daddr
, htonl(0xff020000), 0, 0, htonl(1));
446 if (ipv6_dev_get_saddr(dev_net(br
->dev
), br
->dev
, &ip6h
->daddr
, 0,
451 ipv6_eth_mc_map(&ip6h
->daddr
, eth
->h_dest
);
453 hopopt
= (u8
*)(ip6h
+ 1);
454 hopopt
[0] = IPPROTO_ICMPV6
; /* next hdr */
455 hopopt
[1] = 0; /* length of HbH */
456 hopopt
[2] = IPV6_TLV_ROUTERALERT
; /* Router Alert */
457 hopopt
[3] = 2; /* Length of RA Option */
458 hopopt
[4] = 0; /* Type = 0x0000 (MLD) */
460 hopopt
[6] = IPV6_TLV_PAD1
; /* Pad1 */
461 hopopt
[7] = IPV6_TLV_PAD1
; /* Pad1 */
463 skb_put(skb
, sizeof(*ip6h
) + 8);
466 skb_set_transport_header(skb
, skb
->len
);
467 mldq
= (struct mld_msg
*) icmp6_hdr(skb
);
469 interval
= ipv6_addr_any(group
) ? br
->multicast_last_member_interval
:
470 br
->multicast_query_response_interval
;
472 mldq
->mld_type
= ICMPV6_MGM_QUERY
;
475 mldq
->mld_maxdelay
= htons((u16
)jiffies_to_msecs(interval
));
476 mldq
->mld_reserved
= 0;
477 mldq
->mld_mca
= *group
;
480 mldq
->mld_cksum
= csum_ipv6_magic(&ip6h
->saddr
, &ip6h
->daddr
,
481 sizeof(*mldq
), IPPROTO_ICMPV6
,
484 skb_put(skb
, sizeof(*mldq
));
486 __skb_pull(skb
, sizeof(*eth
));
493 static struct sk_buff
*br_multicast_alloc_query(struct net_bridge
*br
,
496 switch (addr
->proto
) {
497 case htons(ETH_P_IP
):
498 return br_ip4_multicast_alloc_query(br
, addr
->u
.ip4
);
499 #if IS_ENABLED(CONFIG_IPV6)
500 case htons(ETH_P_IPV6
):
501 return br_ip6_multicast_alloc_query(br
, &addr
->u
.ip6
);
507 static struct net_bridge_mdb_entry
*br_multicast_get_group(
508 struct net_bridge
*br
, struct net_bridge_port
*port
,
509 struct br_ip
*group
, int hash
)
511 struct net_bridge_mdb_htable
*mdb
;
512 struct net_bridge_mdb_entry
*mp
;
513 struct hlist_node
*p
;
514 unsigned int count
= 0;
519 mdb
= rcu_dereference_protected(br
->mdb
, 1);
520 hlist_for_each_entry(mp
, p
, &mdb
->mhash
[hash
], hlist
[mdb
->ver
]) {
522 if (unlikely(br_ip_equal(group
, &mp
->addr
)))
529 if (unlikely(count
> br
->hash_elasticity
&& count
)) {
531 br_info(br
, "Multicast hash table "
532 "chain limit reached: %s\n",
533 port
? port
->dev
->name
: br
->dev
->name
);
535 elasticity
= br
->hash_elasticity
;
538 if (mdb
->size
>= max
) {
540 if (unlikely(max
> br
->hash_max
)) {
541 br_warn(br
, "Multicast hash table maximum of %d "
542 "reached, disabling snooping: %s\n",
544 port
? port
->dev
->name
: br
->dev
->name
);
547 br
->multicast_disabled
= 1;
552 if (max
> mdb
->max
|| elasticity
) {
555 br_info(br
, "Multicast hash table "
557 port
? port
->dev
->name
: br
->dev
->name
);
562 err
= br_mdb_rehash(&br
->mdb
, max
, elasticity
);
564 br_warn(br
, "Cannot rehash multicast "
565 "hash table, disabling snooping: %s, %d, %d\n",
566 port
? port
->dev
->name
: br
->dev
->name
,
582 struct net_bridge_mdb_entry
*br_multicast_new_group(struct net_bridge
*br
,
583 struct net_bridge_port
*port
, struct br_ip
*group
)
585 struct net_bridge_mdb_htable
*mdb
;
586 struct net_bridge_mdb_entry
*mp
;
590 mdb
= rcu_dereference_protected(br
->mdb
, 1);
592 err
= br_mdb_rehash(&br
->mdb
, BR_HASH_SIZE
, 0);
598 hash
= br_ip_hash(mdb
, group
);
599 mp
= br_multicast_get_group(br
, port
, group
, hash
);
600 switch (PTR_ERR(mp
)) {
606 mdb
= rcu_dereference_protected(br
->mdb
, 1);
607 hash
= br_ip_hash(mdb
, group
);
614 mp
= kzalloc(sizeof(*mp
), GFP_ATOMIC
);
616 return ERR_PTR(-ENOMEM
);
620 setup_timer(&mp
->timer
, br_multicast_group_expired
,
623 hlist_add_head_rcu(&mp
->hlist
[mdb
->ver
], &mdb
->mhash
[hash
]);
630 struct net_bridge_port_group
*br_multicast_new_port_group(
631 struct net_bridge_port
*port
,
633 struct net_bridge_port_group __rcu
*next
,
636 struct net_bridge_port_group
*p
;
638 p
= kzalloc(sizeof(*p
), GFP_ATOMIC
);
645 rcu_assign_pointer(p
->next
, next
);
646 hlist_add_head(&p
->mglist
, &port
->mglist
);
647 setup_timer(&p
->timer
, br_multicast_port_group_expired
,
652 static int br_multicast_add_group(struct net_bridge
*br
,
653 struct net_bridge_port
*port
,
656 struct net_bridge_mdb_entry
*mp
;
657 struct net_bridge_port_group
*p
;
658 struct net_bridge_port_group __rcu
**pp
;
659 unsigned long now
= jiffies
;
662 spin_lock(&br
->multicast_lock
);
663 if (!netif_running(br
->dev
) ||
664 (port
&& port
->state
== BR_STATE_DISABLED
))
667 mp
= br_multicast_new_group(br
, port
, group
);
674 mod_timer(&mp
->timer
, now
+ br
->multicast_membership_interval
);
678 for (pp
= &mp
->ports
;
679 (p
= mlock_dereference(*pp
, br
)) != NULL
;
683 if ((unsigned long)p
->port
< (unsigned long)port
)
687 p
= br_multicast_new_port_group(port
, group
, *pp
, MDB_TEMPORARY
);
690 rcu_assign_pointer(*pp
, p
);
691 br_mdb_notify(br
->dev
, port
, group
, RTM_NEWMDB
);
694 mod_timer(&p
->timer
, now
+ br
->multicast_membership_interval
);
699 spin_unlock(&br
->multicast_lock
);
703 static int br_ip4_multicast_add_group(struct net_bridge
*br
,
704 struct net_bridge_port
*port
,
708 struct br_ip br_group
;
710 if (ipv4_is_local_multicast(group
))
713 br_group
.u
.ip4
= group
;
714 br_group
.proto
= htons(ETH_P_IP
);
717 return br_multicast_add_group(br
, port
, &br_group
);
720 #if IS_ENABLED(CONFIG_IPV6)
721 static int br_ip6_multicast_add_group(struct net_bridge
*br
,
722 struct net_bridge_port
*port
,
723 const struct in6_addr
*group
,
726 struct br_ip br_group
;
728 if (!ipv6_is_transient_multicast(group
))
731 br_group
.u
.ip6
= *group
;
732 br_group
.proto
= htons(ETH_P_IPV6
);
735 return br_multicast_add_group(br
, port
, &br_group
);
739 static void br_multicast_router_expired(unsigned long data
)
741 struct net_bridge_port
*port
= (void *)data
;
742 struct net_bridge
*br
= port
->br
;
744 spin_lock(&br
->multicast_lock
);
745 if (port
->multicast_router
!= 1 ||
746 timer_pending(&port
->multicast_router_timer
) ||
747 hlist_unhashed(&port
->rlist
))
750 hlist_del_init_rcu(&port
->rlist
);
753 spin_unlock(&br
->multicast_lock
);
756 static void br_multicast_local_router_expired(unsigned long data
)
760 static void br_multicast_querier_expired(unsigned long data
)
762 struct net_bridge
*br
= (void *)data
;
764 spin_lock(&br
->multicast_lock
);
765 if (!netif_running(br
->dev
) || br
->multicast_disabled
)
768 br_multicast_start_querier(br
);
771 spin_unlock(&br
->multicast_lock
);
774 static void __br_multicast_send_query(struct net_bridge
*br
,
775 struct net_bridge_port
*port
,
780 skb
= br_multicast_alloc_query(br
, ip
);
785 __skb_push(skb
, sizeof(struct ethhdr
));
786 skb
->dev
= port
->dev
;
787 NF_HOOK(NFPROTO_BRIDGE
, NF_BR_LOCAL_OUT
, skb
, NULL
, skb
->dev
,
793 static void br_multicast_send_query(struct net_bridge
*br
,
794 struct net_bridge_port
*port
, u32 sent
)
797 struct br_ip br_group
;
799 if (!netif_running(br
->dev
) || br
->multicast_disabled
||
800 !br
->multicast_querier
||
801 timer_pending(&br
->multicast_querier_timer
))
804 memset(&br_group
.u
, 0, sizeof(br_group
.u
));
806 br_group
.proto
= htons(ETH_P_IP
);
807 __br_multicast_send_query(br
, port
, &br_group
);
809 #if IS_ENABLED(CONFIG_IPV6)
810 br_group
.proto
= htons(ETH_P_IPV6
);
811 __br_multicast_send_query(br
, port
, &br_group
);
815 time
+= sent
< br
->multicast_startup_query_count
?
816 br
->multicast_startup_query_interval
:
817 br
->multicast_query_interval
;
818 mod_timer(port
? &port
->multicast_query_timer
:
819 &br
->multicast_query_timer
, time
);
822 static void br_multicast_port_query_expired(unsigned long data
)
824 struct net_bridge_port
*port
= (void *)data
;
825 struct net_bridge
*br
= port
->br
;
827 spin_lock(&br
->multicast_lock
);
828 if (port
->state
== BR_STATE_DISABLED
||
829 port
->state
== BR_STATE_BLOCKING
)
832 if (port
->multicast_startup_queries_sent
<
833 br
->multicast_startup_query_count
)
834 port
->multicast_startup_queries_sent
++;
836 br_multicast_send_query(port
->br
, port
,
837 port
->multicast_startup_queries_sent
);
840 spin_unlock(&br
->multicast_lock
);
843 void br_multicast_add_port(struct net_bridge_port
*port
)
845 port
->multicast_router
= 1;
847 setup_timer(&port
->multicast_router_timer
, br_multicast_router_expired
,
848 (unsigned long)port
);
849 setup_timer(&port
->multicast_query_timer
,
850 br_multicast_port_query_expired
, (unsigned long)port
);
853 void br_multicast_del_port(struct net_bridge_port
*port
)
855 del_timer_sync(&port
->multicast_router_timer
);
858 static void __br_multicast_enable_port(struct net_bridge_port
*port
)
860 port
->multicast_startup_queries_sent
= 0;
862 if (try_to_del_timer_sync(&port
->multicast_query_timer
) >= 0 ||
863 del_timer(&port
->multicast_query_timer
))
864 mod_timer(&port
->multicast_query_timer
, jiffies
);
867 void br_multicast_enable_port(struct net_bridge_port
*port
)
869 struct net_bridge
*br
= port
->br
;
871 spin_lock(&br
->multicast_lock
);
872 if (br
->multicast_disabled
|| !netif_running(br
->dev
))
875 __br_multicast_enable_port(port
);
878 spin_unlock(&br
->multicast_lock
);
881 void br_multicast_disable_port(struct net_bridge_port
*port
)
883 struct net_bridge
*br
= port
->br
;
884 struct net_bridge_port_group
*pg
;
885 struct hlist_node
*p
, *n
;
887 spin_lock(&br
->multicast_lock
);
888 hlist_for_each_entry_safe(pg
, p
, n
, &port
->mglist
, mglist
)
889 br_multicast_del_pg(br
, pg
);
891 if (!hlist_unhashed(&port
->rlist
))
892 hlist_del_init_rcu(&port
->rlist
);
893 del_timer(&port
->multicast_router_timer
);
894 del_timer(&port
->multicast_query_timer
);
895 spin_unlock(&br
->multicast_lock
);
898 static int br_ip4_multicast_igmp3_report(struct net_bridge
*br
,
899 struct net_bridge_port
*port
,
902 struct igmpv3_report
*ih
;
903 struct igmpv3_grec
*grec
;
912 if (!pskb_may_pull(skb
, sizeof(*ih
)))
915 br_vlan_get_tag(skb
, &vid
);
916 ih
= igmpv3_report_hdr(skb
);
917 num
= ntohs(ih
->ngrec
);
920 for (i
= 0; i
< num
; i
++) {
921 len
+= sizeof(*grec
);
922 if (!pskb_may_pull(skb
, len
))
925 grec
= (void *)(skb
->data
+ len
- sizeof(*grec
));
926 group
= grec
->grec_mca
;
927 type
= grec
->grec_type
;
929 len
+= ntohs(grec
->grec_nsrcs
) * 4;
930 if (!pskb_may_pull(skb
, len
))
933 /* We treat this as an IGMPv2 report for now. */
935 case IGMPV3_MODE_IS_INCLUDE
:
936 case IGMPV3_MODE_IS_EXCLUDE
:
937 case IGMPV3_CHANGE_TO_INCLUDE
:
938 case IGMPV3_CHANGE_TO_EXCLUDE
:
939 case IGMPV3_ALLOW_NEW_SOURCES
:
940 case IGMPV3_BLOCK_OLD_SOURCES
:
947 err
= br_ip4_multicast_add_group(br
, port
, group
, vid
);
955 #if IS_ENABLED(CONFIG_IPV6)
956 static int br_ip6_multicast_mld2_report(struct net_bridge
*br
,
957 struct net_bridge_port
*port
,
960 struct icmp6hdr
*icmp6h
;
961 struct mld2_grec
*grec
;
968 if (!pskb_may_pull(skb
, sizeof(*icmp6h
)))
971 br_vlan_get_tag(skb
, &vid
);
972 icmp6h
= icmp6_hdr(skb
);
973 num
= ntohs(icmp6h
->icmp6_dataun
.un_data16
[1]);
974 len
= sizeof(*icmp6h
);
976 for (i
= 0; i
< num
; i
++) {
977 __be16
*nsrcs
, _nsrcs
;
979 nsrcs
= skb_header_pointer(skb
,
980 len
+ offsetof(struct mld2_grec
,
982 sizeof(_nsrcs
), &_nsrcs
);
986 if (!pskb_may_pull(skb
,
987 len
+ sizeof(*grec
) +
988 sizeof(struct in6_addr
) * ntohs(*nsrcs
)))
991 grec
= (struct mld2_grec
*)(skb
->data
+ len
);
992 len
+= sizeof(*grec
) +
993 sizeof(struct in6_addr
) * ntohs(*nsrcs
);
995 /* We treat these as MLDv1 reports for now. */
996 switch (grec
->grec_type
) {
997 case MLD2_MODE_IS_INCLUDE
:
998 case MLD2_MODE_IS_EXCLUDE
:
999 case MLD2_CHANGE_TO_INCLUDE
:
1000 case MLD2_CHANGE_TO_EXCLUDE
:
1001 case MLD2_ALLOW_NEW_SOURCES
:
1002 case MLD2_BLOCK_OLD_SOURCES
:
1009 err
= br_ip6_multicast_add_group(br
, port
, &grec
->grec_mca
,
1020 * Add port to rotuer_list
1021 * list is maintained ordered by pointer value
1022 * and locked by br->multicast_lock and RCU
1024 static void br_multicast_add_router(struct net_bridge
*br
,
1025 struct net_bridge_port
*port
)
1027 struct net_bridge_port
*p
;
1028 struct hlist_node
*n
, *slot
= NULL
;
1030 hlist_for_each_entry(p
, n
, &br
->router_list
, rlist
) {
1031 if ((unsigned long) port
>= (unsigned long) p
)
1037 hlist_add_after_rcu(slot
, &port
->rlist
);
1039 hlist_add_head_rcu(&port
->rlist
, &br
->router_list
);
1042 static void br_multicast_mark_router(struct net_bridge
*br
,
1043 struct net_bridge_port
*port
)
1045 unsigned long now
= jiffies
;
1048 if (br
->multicast_router
== 1)
1049 mod_timer(&br
->multicast_router_timer
,
1050 now
+ br
->multicast_querier_interval
);
1054 if (port
->multicast_router
!= 1)
1057 if (!hlist_unhashed(&port
->rlist
))
1060 br_multicast_add_router(br
, port
);
1063 mod_timer(&port
->multicast_router_timer
,
1064 now
+ br
->multicast_querier_interval
);
1067 static void br_multicast_query_received(struct net_bridge
*br
,
1068 struct net_bridge_port
*port
,
1072 mod_timer(&br
->multicast_querier_timer
,
1073 jiffies
+ br
->multicast_querier_interval
);
1074 else if (timer_pending(&br
->multicast_querier_timer
))
1077 br_multicast_mark_router(br
, port
);
1080 static int br_ip4_multicast_query(struct net_bridge
*br
,
1081 struct net_bridge_port
*port
,
1082 struct sk_buff
*skb
)
1084 const struct iphdr
*iph
= ip_hdr(skb
);
1085 struct igmphdr
*ih
= igmp_hdr(skb
);
1086 struct net_bridge_mdb_entry
*mp
;
1087 struct igmpv3_query
*ih3
;
1088 struct net_bridge_port_group
*p
;
1089 struct net_bridge_port_group __rcu
**pp
;
1090 unsigned long max_delay
;
1091 unsigned long now
= jiffies
;
1096 spin_lock(&br
->multicast_lock
);
1097 if (!netif_running(br
->dev
) ||
1098 (port
&& port
->state
== BR_STATE_DISABLED
))
1101 br_multicast_query_received(br
, port
, !!iph
->saddr
);
1105 if (skb
->len
== sizeof(*ih
)) {
1106 max_delay
= ih
->code
* (HZ
/ IGMP_TIMER_SCALE
);
1109 max_delay
= 10 * HZ
;
1113 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
))) {
1118 ih3
= igmpv3_query_hdr(skb
);
1122 max_delay
= ih3
->code
?
1123 IGMPV3_MRC(ih3
->code
) * (HZ
/ IGMP_TIMER_SCALE
) : 1;
1129 br_vlan_get_tag(skb
, &vid
);
1130 mp
= br_mdb_ip4_get(mlock_dereference(br
->mdb
, br
), group
, vid
);
1134 max_delay
*= br
->multicast_last_member_count
;
1137 (timer_pending(&mp
->timer
) ?
1138 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1139 try_to_del_timer_sync(&mp
->timer
) >= 0))
1140 mod_timer(&mp
->timer
, now
+ max_delay
);
1142 for (pp
= &mp
->ports
;
1143 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1145 if (timer_pending(&p
->timer
) ?
1146 time_after(p
->timer
.expires
, now
+ max_delay
) :
1147 try_to_del_timer_sync(&p
->timer
) >= 0)
1148 mod_timer(&p
->timer
, now
+ max_delay
);
1152 spin_unlock(&br
->multicast_lock
);
1156 #if IS_ENABLED(CONFIG_IPV6)
1157 static int br_ip6_multicast_query(struct net_bridge
*br
,
1158 struct net_bridge_port
*port
,
1159 struct sk_buff
*skb
)
1161 const struct ipv6hdr
*ip6h
= ipv6_hdr(skb
);
1162 struct mld_msg
*mld
;
1163 struct net_bridge_mdb_entry
*mp
;
1164 struct mld2_query
*mld2q
;
1165 struct net_bridge_port_group
*p
;
1166 struct net_bridge_port_group __rcu
**pp
;
1167 unsigned long max_delay
;
1168 unsigned long now
= jiffies
;
1169 const struct in6_addr
*group
= NULL
;
1173 spin_lock(&br
->multicast_lock
);
1174 if (!netif_running(br
->dev
) ||
1175 (port
&& port
->state
== BR_STATE_DISABLED
))
1178 br_multicast_query_received(br
, port
, !ipv6_addr_any(&ip6h
->saddr
));
1180 if (skb
->len
== sizeof(*mld
)) {
1181 if (!pskb_may_pull(skb
, sizeof(*mld
))) {
1185 mld
= (struct mld_msg
*) icmp6_hdr(skb
);
1186 max_delay
= msecs_to_jiffies(ntohs(mld
->mld_maxdelay
));
1188 group
= &mld
->mld_mca
;
1189 } else if (skb
->len
>= sizeof(*mld2q
)) {
1190 if (!pskb_may_pull(skb
, sizeof(*mld2q
))) {
1194 mld2q
= (struct mld2_query
*)icmp6_hdr(skb
);
1195 if (!mld2q
->mld2q_nsrcs
)
1196 group
= &mld2q
->mld2q_mca
;
1197 max_delay
= mld2q
->mld2q_mrc
? MLDV2_MRC(ntohs(mld2q
->mld2q_mrc
)) : 1;
1203 br_vlan_get_tag(skb
, &vid
);
1204 mp
= br_mdb_ip6_get(mlock_dereference(br
->mdb
, br
), group
, vid
);
1208 max_delay
*= br
->multicast_last_member_count
;
1210 (timer_pending(&mp
->timer
) ?
1211 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1212 try_to_del_timer_sync(&mp
->timer
) >= 0))
1213 mod_timer(&mp
->timer
, now
+ max_delay
);
1215 for (pp
= &mp
->ports
;
1216 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1218 if (timer_pending(&p
->timer
) ?
1219 time_after(p
->timer
.expires
, now
+ max_delay
) :
1220 try_to_del_timer_sync(&p
->timer
) >= 0)
1221 mod_timer(&p
->timer
, now
+ max_delay
);
1225 spin_unlock(&br
->multicast_lock
);
1230 static void br_multicast_leave_group(struct net_bridge
*br
,
1231 struct net_bridge_port
*port
,
1232 struct br_ip
*group
)
1234 struct net_bridge_mdb_htable
*mdb
;
1235 struct net_bridge_mdb_entry
*mp
;
1236 struct net_bridge_port_group
*p
;
1240 spin_lock(&br
->multicast_lock
);
1241 if (!netif_running(br
->dev
) ||
1242 (port
&& port
->state
== BR_STATE_DISABLED
) ||
1243 timer_pending(&br
->multicast_querier_timer
))
1246 mdb
= mlock_dereference(br
->mdb
, br
);
1247 mp
= br_mdb_ip_get(mdb
, group
);
1251 if (port
&& (port
->flags
& BR_MULTICAST_FAST_LEAVE
)) {
1252 struct net_bridge_port_group __rcu
**pp
;
1254 for (pp
= &mp
->ports
;
1255 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1257 if (p
->port
!= port
)
1260 rcu_assign_pointer(*pp
, p
->next
);
1261 hlist_del_init(&p
->mglist
);
1262 del_timer(&p
->timer
);
1263 call_rcu_bh(&p
->rcu
, br_multicast_free_pg
);
1264 br_mdb_notify(br
->dev
, port
, group
, RTM_DELMDB
);
1266 if (!mp
->ports
&& !mp
->mglist
&&
1267 netif_running(br
->dev
))
1268 mod_timer(&mp
->timer
, jiffies
);
1274 time
= now
+ br
->multicast_last_member_count
*
1275 br
->multicast_last_member_interval
;
1279 (timer_pending(&mp
->timer
) ?
1280 time_after(mp
->timer
.expires
, time
) :
1281 try_to_del_timer_sync(&mp
->timer
) >= 0)) {
1282 mod_timer(&mp
->timer
, time
);
1288 for (p
= mlock_dereference(mp
->ports
, br
);
1290 p
= mlock_dereference(p
->next
, br
)) {
1291 if (p
->port
!= port
)
1294 if (!hlist_unhashed(&p
->mglist
) &&
1295 (timer_pending(&p
->timer
) ?
1296 time_after(p
->timer
.expires
, time
) :
1297 try_to_del_timer_sync(&p
->timer
) >= 0)) {
1298 mod_timer(&p
->timer
, time
);
1305 spin_unlock(&br
->multicast_lock
);
1308 static void br_ip4_multicast_leave_group(struct net_bridge
*br
,
1309 struct net_bridge_port
*port
,
1313 struct br_ip br_group
;
1315 if (ipv4_is_local_multicast(group
))
1318 br_group
.u
.ip4
= group
;
1319 br_group
.proto
= htons(ETH_P_IP
);
1322 br_multicast_leave_group(br
, port
, &br_group
);
1325 #if IS_ENABLED(CONFIG_IPV6)
1326 static void br_ip6_multicast_leave_group(struct net_bridge
*br
,
1327 struct net_bridge_port
*port
,
1328 const struct in6_addr
*group
,
1331 struct br_ip br_group
;
1333 if (!ipv6_is_transient_multicast(group
))
1336 br_group
.u
.ip6
= *group
;
1337 br_group
.proto
= htons(ETH_P_IPV6
);
1340 br_multicast_leave_group(br
, port
, &br_group
);
1344 static int br_multicast_ipv4_rcv(struct net_bridge
*br
,
1345 struct net_bridge_port
*port
,
1346 struct sk_buff
*skb
)
1348 struct sk_buff
*skb2
= skb
;
1349 const struct iphdr
*iph
;
1352 unsigned int offset
;
1356 /* We treat OOM as packet loss for now. */
1357 if (!pskb_may_pull(skb
, sizeof(*iph
)))
1362 if (iph
->ihl
< 5 || iph
->version
!= 4)
1365 if (!pskb_may_pull(skb
, ip_hdrlen(skb
)))
1370 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1373 if (iph
->protocol
!= IPPROTO_IGMP
) {
1374 if ((iph
->daddr
& IGMP_LOCAL_GROUP_MASK
) != IGMP_LOCAL_GROUP
)
1375 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1379 len
= ntohs(iph
->tot_len
);
1380 if (skb
->len
< len
|| len
< ip_hdrlen(skb
))
1383 if (skb
->len
> len
) {
1384 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1388 err
= pskb_trim_rcsum(skb2
, len
);
1393 len
-= ip_hdrlen(skb2
);
1394 offset
= skb_network_offset(skb2
) + ip_hdrlen(skb2
);
1395 __skb_pull(skb2
, offset
);
1396 skb_reset_transport_header(skb2
);
1399 if (!pskb_may_pull(skb2
, sizeof(*ih
)))
1402 switch (skb2
->ip_summed
) {
1403 case CHECKSUM_COMPLETE
:
1404 if (!csum_fold(skb2
->csum
))
1409 if (skb_checksum_complete(skb2
))
1415 br_vlan_get_tag(skb2
, &vid
);
1416 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1417 ih
= igmp_hdr(skb2
);
1420 case IGMP_HOST_MEMBERSHIP_REPORT
:
1421 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1422 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1423 err
= br_ip4_multicast_add_group(br
, port
, ih
->group
, vid
);
1425 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1426 err
= br_ip4_multicast_igmp3_report(br
, port
, skb2
);
1428 case IGMP_HOST_MEMBERSHIP_QUERY
:
1429 err
= br_ip4_multicast_query(br
, port
, skb2
);
1431 case IGMP_HOST_LEAVE_MESSAGE
:
1432 br_ip4_multicast_leave_group(br
, port
, ih
->group
, vid
);
1437 __skb_push(skb2
, offset
);
1444 #if IS_ENABLED(CONFIG_IPV6)
1445 static int br_multicast_ipv6_rcv(struct net_bridge
*br
,
1446 struct net_bridge_port
*port
,
1447 struct sk_buff
*skb
)
1449 struct sk_buff
*skb2
;
1450 const struct ipv6hdr
*ip6h
;
1459 if (!pskb_may_pull(skb
, sizeof(*ip6h
)))
1462 ip6h
= ipv6_hdr(skb
);
1465 * We're interested in MLD messages only.
1467 * - MLD has always Router Alert hop-by-hop option
1468 * - But we do not support jumbrograms.
1470 if (ip6h
->version
!= 6 ||
1471 ip6h
->nexthdr
!= IPPROTO_HOPOPTS
||
1472 ip6h
->payload_len
== 0)
1475 len
= ntohs(ip6h
->payload_len
) + sizeof(*ip6h
);
1479 nexthdr
= ip6h
->nexthdr
;
1480 offset
= ipv6_skip_exthdr(skb
, sizeof(*ip6h
), &nexthdr
, &frag_off
);
1482 if (offset
< 0 || nexthdr
!= IPPROTO_ICMPV6
)
1485 /* Okay, we found ICMPv6 header */
1486 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1491 if (!pskb_may_pull(skb2
, offset
+ sizeof(struct icmp6hdr
)))
1494 len
-= offset
- skb_network_offset(skb2
);
1496 __skb_pull(skb2
, offset
);
1497 skb_reset_transport_header(skb2
);
1498 skb_postpull_rcsum(skb2
, skb_network_header(skb2
),
1499 skb_network_header_len(skb2
));
1501 icmp6_type
= icmp6_hdr(skb2
)->icmp6_type
;
1503 switch (icmp6_type
) {
1504 case ICMPV6_MGM_QUERY
:
1505 case ICMPV6_MGM_REPORT
:
1506 case ICMPV6_MGM_REDUCTION
:
1507 case ICMPV6_MLD2_REPORT
:
1514 /* Okay, we found MLD message. Check further. */
1515 if (skb2
->len
> len
) {
1516 err
= pskb_trim_rcsum(skb2
, len
);
1522 ip6h
= ipv6_hdr(skb2
);
1524 switch (skb2
->ip_summed
) {
1525 case CHECKSUM_COMPLETE
:
1526 if (!csum_ipv6_magic(&ip6h
->saddr
, &ip6h
->daddr
, skb2
->len
,
1527 IPPROTO_ICMPV6
, skb2
->csum
))
1531 skb2
->csum
= ~csum_unfold(csum_ipv6_magic(&ip6h
->saddr
,
1534 IPPROTO_ICMPV6
, 0));
1535 if (__skb_checksum_complete(skb2
))
1541 br_vlan_get_tag(skb
, &vid
);
1542 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1544 switch (icmp6_type
) {
1545 case ICMPV6_MGM_REPORT
:
1547 struct mld_msg
*mld
;
1548 if (!pskb_may_pull(skb2
, sizeof(*mld
))) {
1552 mld
= (struct mld_msg
*)skb_transport_header(skb2
);
1553 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1554 err
= br_ip6_multicast_add_group(br
, port
, &mld
->mld_mca
, vid
);
1557 case ICMPV6_MLD2_REPORT
:
1558 err
= br_ip6_multicast_mld2_report(br
, port
, skb2
);
1560 case ICMPV6_MGM_QUERY
:
1561 err
= br_ip6_multicast_query(br
, port
, skb2
);
1563 case ICMPV6_MGM_REDUCTION
:
1565 struct mld_msg
*mld
;
1566 if (!pskb_may_pull(skb2
, sizeof(*mld
))) {
1570 mld
= (struct mld_msg
*)skb_transport_header(skb2
);
1571 br_ip6_multicast_leave_group(br
, port
, &mld
->mld_mca
, vid
);
1581 int br_multicast_rcv(struct net_bridge
*br
, struct net_bridge_port
*port
,
1582 struct sk_buff
*skb
)
1584 BR_INPUT_SKB_CB(skb
)->igmp
= 0;
1585 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 0;
1587 if (br
->multicast_disabled
)
1590 switch (skb
->protocol
) {
1591 case htons(ETH_P_IP
):
1592 return br_multicast_ipv4_rcv(br
, port
, skb
);
1593 #if IS_ENABLED(CONFIG_IPV6)
1594 case htons(ETH_P_IPV6
):
1595 return br_multicast_ipv6_rcv(br
, port
, skb
);
1602 static void br_multicast_query_expired(unsigned long data
)
1604 struct net_bridge
*br
= (void *)data
;
1606 spin_lock(&br
->multicast_lock
);
1607 if (br
->multicast_startup_queries_sent
<
1608 br
->multicast_startup_query_count
)
1609 br
->multicast_startup_queries_sent
++;
1611 br_multicast_send_query(br
, NULL
, br
->multicast_startup_queries_sent
);
1613 spin_unlock(&br
->multicast_lock
);
1616 void br_multicast_init(struct net_bridge
*br
)
1618 br
->hash_elasticity
= 4;
1621 br
->multicast_router
= 1;
1622 br
->multicast_querier
= 0;
1623 br
->multicast_last_member_count
= 2;
1624 br
->multicast_startup_query_count
= 2;
1626 br
->multicast_last_member_interval
= HZ
;
1627 br
->multicast_query_response_interval
= 10 * HZ
;
1628 br
->multicast_startup_query_interval
= 125 * HZ
/ 4;
1629 br
->multicast_query_interval
= 125 * HZ
;
1630 br
->multicast_querier_interval
= 255 * HZ
;
1631 br
->multicast_membership_interval
= 260 * HZ
;
1633 spin_lock_init(&br
->multicast_lock
);
1634 setup_timer(&br
->multicast_router_timer
,
1635 br_multicast_local_router_expired
, 0);
1636 setup_timer(&br
->multicast_querier_timer
,
1637 br_multicast_querier_expired
, (unsigned long)br
);
1638 setup_timer(&br
->multicast_query_timer
, br_multicast_query_expired
,
1642 void br_multicast_open(struct net_bridge
*br
)
1644 br
->multicast_startup_queries_sent
= 0;
1646 if (br
->multicast_disabled
)
1649 mod_timer(&br
->multicast_query_timer
, jiffies
);
1652 void br_multicast_stop(struct net_bridge
*br
)
1654 struct net_bridge_mdb_htable
*mdb
;
1655 struct net_bridge_mdb_entry
*mp
;
1656 struct hlist_node
*p
, *n
;
1660 del_timer_sync(&br
->multicast_router_timer
);
1661 del_timer_sync(&br
->multicast_querier_timer
);
1662 del_timer_sync(&br
->multicast_query_timer
);
1664 spin_lock_bh(&br
->multicast_lock
);
1665 mdb
= mlock_dereference(br
->mdb
, br
);
1672 for (i
= 0; i
< mdb
->max
; i
++) {
1673 hlist_for_each_entry_safe(mp
, p
, n
, &mdb
->mhash
[i
],
1675 del_timer(&mp
->timer
);
1676 call_rcu_bh(&mp
->rcu
, br_multicast_free_group
);
1681 spin_unlock_bh(&br
->multicast_lock
);
1683 spin_lock_bh(&br
->multicast_lock
);
1688 call_rcu_bh(&mdb
->rcu
, br_mdb_free
);
1691 spin_unlock_bh(&br
->multicast_lock
);
1694 int br_multicast_set_router(struct net_bridge
*br
, unsigned long val
)
1698 spin_lock_bh(&br
->multicast_lock
);
1699 if (!netif_running(br
->dev
))
1705 del_timer(&br
->multicast_router_timer
);
1708 br
->multicast_router
= val
;
1718 spin_unlock_bh(&br
->multicast_lock
);
1723 int br_multicast_set_port_router(struct net_bridge_port
*p
, unsigned long val
)
1725 struct net_bridge
*br
= p
->br
;
1728 spin_lock(&br
->multicast_lock
);
1729 if (!netif_running(br
->dev
) || p
->state
== BR_STATE_DISABLED
)
1736 p
->multicast_router
= val
;
1739 if (val
< 2 && !hlist_unhashed(&p
->rlist
))
1740 hlist_del_init_rcu(&p
->rlist
);
1745 del_timer(&p
->multicast_router_timer
);
1750 br_multicast_add_router(br
, p
);
1759 spin_unlock(&br
->multicast_lock
);
1764 static void br_multicast_start_querier(struct net_bridge
*br
)
1766 struct net_bridge_port
*port
;
1768 br_multicast_open(br
);
1770 list_for_each_entry(port
, &br
->port_list
, list
) {
1771 if (port
->state
== BR_STATE_DISABLED
||
1772 port
->state
== BR_STATE_BLOCKING
)
1775 __br_multicast_enable_port(port
);
1779 int br_multicast_toggle(struct net_bridge
*br
, unsigned long val
)
1782 struct net_bridge_mdb_htable
*mdb
;
1784 spin_lock_bh(&br
->multicast_lock
);
1785 if (br
->multicast_disabled
== !val
)
1788 br
->multicast_disabled
= !val
;
1789 if (br
->multicast_disabled
)
1792 if (!netif_running(br
->dev
))
1795 mdb
= mlock_dereference(br
->mdb
, br
);
1800 br
->multicast_disabled
= !!val
;
1804 err
= br_mdb_rehash(&br
->mdb
, mdb
->max
,
1805 br
->hash_elasticity
);
1810 br_multicast_start_querier(br
);
1813 spin_unlock_bh(&br
->multicast_lock
);
1818 int br_multicast_set_querier(struct net_bridge
*br
, unsigned long val
)
1822 spin_lock_bh(&br
->multicast_lock
);
1823 if (br
->multicast_querier
== val
)
1826 br
->multicast_querier
= val
;
1828 br_multicast_start_querier(br
);
1831 spin_unlock_bh(&br
->multicast_lock
);
1836 int br_multicast_set_hash_max(struct net_bridge
*br
, unsigned long val
)
1840 struct net_bridge_mdb_htable
*mdb
;
1842 spin_lock(&br
->multicast_lock
);
1843 if (!netif_running(br
->dev
))
1847 if (!is_power_of_2(val
))
1850 mdb
= mlock_dereference(br
->mdb
, br
);
1851 if (mdb
&& val
< mdb
->size
)
1867 err
= br_mdb_rehash(&br
->mdb
, br
->hash_max
,
1868 br
->hash_elasticity
);
1874 spin_unlock(&br
->multicast_lock
);