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
;
90 hlist_for_each_entry_rcu(mp
, &mdb
->mhash
[hash
], hlist
[mdb
->ver
]) {
91 if (br_ip_equal(&mp
->addr
, dst
))
98 struct net_bridge_mdb_entry
*br_mdb_ip_get(struct net_bridge_mdb_htable
*mdb
,
104 return __br_mdb_ip_get(mdb
, dst
, br_ip_hash(mdb
, dst
));
107 static struct net_bridge_mdb_entry
*br_mdb_ip4_get(
108 struct net_bridge_mdb_htable
*mdb
, __be32 dst
, __u16 vid
)
113 br_dst
.proto
= htons(ETH_P_IP
);
116 return br_mdb_ip_get(mdb
, &br_dst
);
119 #if IS_ENABLED(CONFIG_IPV6)
120 static struct net_bridge_mdb_entry
*br_mdb_ip6_get(
121 struct net_bridge_mdb_htable
*mdb
, const struct in6_addr
*dst
,
127 br_dst
.proto
= htons(ETH_P_IPV6
);
130 return br_mdb_ip_get(mdb
, &br_dst
);
134 struct net_bridge_mdb_entry
*br_mdb_get(struct net_bridge
*br
,
137 struct net_bridge_mdb_htable
*mdb
= rcu_dereference(br
->mdb
);
140 if (br
->multicast_disabled
)
143 if (BR_INPUT_SKB_CB(skb
)->igmp
)
146 ip
.proto
= skb
->protocol
;
148 switch (skb
->protocol
) {
149 case htons(ETH_P_IP
):
150 ip
.u
.ip4
= ip_hdr(skb
)->daddr
;
152 #if IS_ENABLED(CONFIG_IPV6)
153 case htons(ETH_P_IPV6
):
154 ip
.u
.ip6
= ipv6_hdr(skb
)->daddr
;
161 return br_mdb_ip_get(mdb
, &ip
);
164 static void br_mdb_free(struct rcu_head
*head
)
166 struct net_bridge_mdb_htable
*mdb
=
167 container_of(head
, struct net_bridge_mdb_htable
, rcu
);
168 struct net_bridge_mdb_htable
*old
= mdb
->old
;
175 static int br_mdb_copy(struct net_bridge_mdb_htable
*new,
176 struct net_bridge_mdb_htable
*old
,
179 struct net_bridge_mdb_entry
*mp
;
184 for (i
= 0; i
< old
->max
; i
++)
185 hlist_for_each_entry(mp
, &old
->mhash
[i
], hlist
[old
->ver
])
186 hlist_add_head(&mp
->hlist
[new->ver
],
187 &new->mhash
[br_ip_hash(new, &mp
->addr
)]);
193 for (i
= 0; i
< new->max
; i
++) {
195 hlist_for_each_entry(mp
, &new->mhash
[i
], hlist
[new->ver
])
201 return maxlen
> elasticity
? -EINVAL
: 0;
204 void br_multicast_free_pg(struct rcu_head
*head
)
206 struct net_bridge_port_group
*p
=
207 container_of(head
, struct net_bridge_port_group
, rcu
);
212 static void br_multicast_free_group(struct rcu_head
*head
)
214 struct net_bridge_mdb_entry
*mp
=
215 container_of(head
, struct net_bridge_mdb_entry
, rcu
);
220 static void br_multicast_group_expired(unsigned long data
)
222 struct net_bridge_mdb_entry
*mp
= (void *)data
;
223 struct net_bridge
*br
= mp
->br
;
224 struct net_bridge_mdb_htable
*mdb
;
226 spin_lock(&br
->multicast_lock
);
227 if (!netif_running(br
->dev
) || timer_pending(&mp
->timer
))
235 mdb
= mlock_dereference(br
->mdb
, br
);
237 hlist_del_rcu(&mp
->hlist
[mdb
->ver
]);
240 call_rcu_bh(&mp
->rcu
, br_multicast_free_group
);
243 spin_unlock(&br
->multicast_lock
);
246 static void br_multicast_del_pg(struct net_bridge
*br
,
247 struct net_bridge_port_group
*pg
)
249 struct net_bridge_mdb_htable
*mdb
;
250 struct net_bridge_mdb_entry
*mp
;
251 struct net_bridge_port_group
*p
;
252 struct net_bridge_port_group __rcu
**pp
;
254 mdb
= mlock_dereference(br
->mdb
, br
);
256 mp
= br_mdb_ip_get(mdb
, &pg
->addr
);
260 for (pp
= &mp
->ports
;
261 (p
= mlock_dereference(*pp
, br
)) != NULL
;
266 rcu_assign_pointer(*pp
, p
->next
);
267 hlist_del_init(&p
->mglist
);
268 del_timer(&p
->timer
);
269 call_rcu_bh(&p
->rcu
, br_multicast_free_pg
);
271 if (!mp
->ports
&& !mp
->mglist
&&
272 netif_running(br
->dev
))
273 mod_timer(&mp
->timer
, jiffies
);
281 static void br_multicast_port_group_expired(unsigned long data
)
283 struct net_bridge_port_group
*pg
= (void *)data
;
284 struct net_bridge
*br
= pg
->port
->br
;
286 spin_lock(&br
->multicast_lock
);
287 if (!netif_running(br
->dev
) || timer_pending(&pg
->timer
) ||
288 hlist_unhashed(&pg
->mglist
) || pg
->state
& MDB_PERMANENT
)
291 br_multicast_del_pg(br
, pg
);
294 spin_unlock(&br
->multicast_lock
);
297 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu
**mdbp
, int max
,
300 struct net_bridge_mdb_htable
*old
= rcu_dereference_protected(*mdbp
, 1);
301 struct net_bridge_mdb_htable
*mdb
;
304 mdb
= kmalloc(sizeof(*mdb
), GFP_ATOMIC
);
311 mdb
->mhash
= kzalloc(max
* sizeof(*mdb
->mhash
), GFP_ATOMIC
);
317 mdb
->size
= old
? old
->size
: 0;
318 mdb
->ver
= old
? old
->ver
^ 1 : 0;
320 if (!old
|| elasticity
)
321 get_random_bytes(&mdb
->secret
, sizeof(mdb
->secret
));
323 mdb
->secret
= old
->secret
;
328 err
= br_mdb_copy(mdb
, old
, elasticity
);
336 call_rcu_bh(&mdb
->rcu
, br_mdb_free
);
339 rcu_assign_pointer(*mdbp
, mdb
);
344 static struct sk_buff
*br_ip4_multicast_alloc_query(struct net_bridge
*br
,
352 skb
= netdev_alloc_skb_ip_align(br
->dev
, sizeof(*eth
) + sizeof(*iph
) +
357 skb
->protocol
= htons(ETH_P_IP
);
359 skb_reset_mac_header(skb
);
362 memcpy(eth
->h_source
, br
->dev
->dev_addr
, 6);
365 eth
->h_dest
[2] = 0x5e;
369 eth
->h_proto
= htons(ETH_P_IP
);
370 skb_put(skb
, sizeof(*eth
));
372 skb_set_network_header(skb
, skb
->len
);
378 iph
->tot_len
= htons(sizeof(*iph
) + sizeof(*ih
) + 4);
380 iph
->frag_off
= htons(IP_DF
);
382 iph
->protocol
= IPPROTO_IGMP
;
384 iph
->daddr
= htonl(INADDR_ALLHOSTS_GROUP
);
385 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
386 ((u8
*)&iph
[1])[1] = 4;
387 ((u8
*)&iph
[1])[2] = 0;
388 ((u8
*)&iph
[1])[3] = 0;
392 skb_set_transport_header(skb
, skb
->len
);
394 ih
->type
= IGMP_HOST_MEMBERSHIP_QUERY
;
395 ih
->code
= (group
? br
->multicast_last_member_interval
:
396 br
->multicast_query_response_interval
) /
397 (HZ
/ IGMP_TIMER_SCALE
);
400 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
401 skb_put(skb
, sizeof(*ih
));
403 __skb_pull(skb
, sizeof(*eth
));
409 #if IS_ENABLED(CONFIG_IPV6)
410 static struct sk_buff
*br_ip6_multicast_alloc_query(struct net_bridge
*br
,
411 const struct in6_addr
*group
)
414 struct ipv6hdr
*ip6h
;
415 struct mld_msg
*mldq
;
418 unsigned long interval
;
420 skb
= netdev_alloc_skb_ip_align(br
->dev
, sizeof(*eth
) + sizeof(*ip6h
) +
425 skb
->protocol
= htons(ETH_P_IPV6
);
427 /* Ethernet header */
428 skb_reset_mac_header(skb
);
431 memcpy(eth
->h_source
, br
->dev
->dev_addr
, 6);
432 eth
->h_proto
= htons(ETH_P_IPV6
);
433 skb_put(skb
, sizeof(*eth
));
435 /* IPv6 header + HbH option */
436 skb_set_network_header(skb
, skb
->len
);
437 ip6h
= ipv6_hdr(skb
);
439 *(__force __be32
*)ip6h
= htonl(0x60000000);
440 ip6h
->payload_len
= htons(8 + sizeof(*mldq
));
441 ip6h
->nexthdr
= IPPROTO_HOPOPTS
;
443 ipv6_addr_set(&ip6h
->daddr
, htonl(0xff020000), 0, 0, htonl(1));
444 if (ipv6_dev_get_saddr(dev_net(br
->dev
), br
->dev
, &ip6h
->daddr
, 0,
449 ipv6_eth_mc_map(&ip6h
->daddr
, eth
->h_dest
);
451 hopopt
= (u8
*)(ip6h
+ 1);
452 hopopt
[0] = IPPROTO_ICMPV6
; /* next hdr */
453 hopopt
[1] = 0; /* length of HbH */
454 hopopt
[2] = IPV6_TLV_ROUTERALERT
; /* Router Alert */
455 hopopt
[3] = 2; /* Length of RA Option */
456 hopopt
[4] = 0; /* Type = 0x0000 (MLD) */
458 hopopt
[6] = IPV6_TLV_PAD1
; /* Pad1 */
459 hopopt
[7] = IPV6_TLV_PAD1
; /* Pad1 */
461 skb_put(skb
, sizeof(*ip6h
) + 8);
464 skb_set_transport_header(skb
, skb
->len
);
465 mldq
= (struct mld_msg
*) icmp6_hdr(skb
);
467 interval
= ipv6_addr_any(group
) ? br
->multicast_last_member_interval
:
468 br
->multicast_query_response_interval
;
470 mldq
->mld_type
= ICMPV6_MGM_QUERY
;
473 mldq
->mld_maxdelay
= htons((u16
)jiffies_to_msecs(interval
));
474 mldq
->mld_reserved
= 0;
475 mldq
->mld_mca
= *group
;
478 mldq
->mld_cksum
= csum_ipv6_magic(&ip6h
->saddr
, &ip6h
->daddr
,
479 sizeof(*mldq
), IPPROTO_ICMPV6
,
482 skb_put(skb
, sizeof(*mldq
));
484 __skb_pull(skb
, sizeof(*eth
));
491 static struct sk_buff
*br_multicast_alloc_query(struct net_bridge
*br
,
494 switch (addr
->proto
) {
495 case htons(ETH_P_IP
):
496 return br_ip4_multicast_alloc_query(br
, addr
->u
.ip4
);
497 #if IS_ENABLED(CONFIG_IPV6)
498 case htons(ETH_P_IPV6
):
499 return br_ip6_multicast_alloc_query(br
, &addr
->u
.ip6
);
505 static struct net_bridge_mdb_entry
*br_multicast_get_group(
506 struct net_bridge
*br
, struct net_bridge_port
*port
,
507 struct br_ip
*group
, int hash
)
509 struct net_bridge_mdb_htable
*mdb
;
510 struct net_bridge_mdb_entry
*mp
;
511 unsigned int count
= 0;
516 mdb
= rcu_dereference_protected(br
->mdb
, 1);
517 hlist_for_each_entry(mp
, &mdb
->mhash
[hash
], hlist
[mdb
->ver
]) {
519 if (unlikely(br_ip_equal(group
, &mp
->addr
)))
526 if (unlikely(count
> br
->hash_elasticity
&& count
)) {
528 br_info(br
, "Multicast hash table "
529 "chain limit reached: %s\n",
530 port
? port
->dev
->name
: br
->dev
->name
);
532 elasticity
= br
->hash_elasticity
;
535 if (mdb
->size
>= max
) {
537 if (unlikely(max
> br
->hash_max
)) {
538 br_warn(br
, "Multicast hash table maximum of %d "
539 "reached, disabling snooping: %s\n",
541 port
? port
->dev
->name
: br
->dev
->name
);
544 br
->multicast_disabled
= 1;
549 if (max
> mdb
->max
|| elasticity
) {
552 br_info(br
, "Multicast hash table "
554 port
? port
->dev
->name
: br
->dev
->name
);
559 err
= br_mdb_rehash(&br
->mdb
, max
, elasticity
);
561 br_warn(br
, "Cannot rehash multicast "
562 "hash table, disabling snooping: %s, %d, %d\n",
563 port
? port
->dev
->name
: br
->dev
->name
,
579 struct net_bridge_mdb_entry
*br_multicast_new_group(struct net_bridge
*br
,
580 struct net_bridge_port
*port
, struct br_ip
*group
)
582 struct net_bridge_mdb_htable
*mdb
;
583 struct net_bridge_mdb_entry
*mp
;
587 mdb
= rcu_dereference_protected(br
->mdb
, 1);
589 err
= br_mdb_rehash(&br
->mdb
, BR_HASH_SIZE
, 0);
595 hash
= br_ip_hash(mdb
, group
);
596 mp
= br_multicast_get_group(br
, port
, group
, hash
);
597 switch (PTR_ERR(mp
)) {
603 mdb
= rcu_dereference_protected(br
->mdb
, 1);
604 hash
= br_ip_hash(mdb
, group
);
611 mp
= kzalloc(sizeof(*mp
), GFP_ATOMIC
);
613 return ERR_PTR(-ENOMEM
);
617 setup_timer(&mp
->timer
, br_multicast_group_expired
,
620 hlist_add_head_rcu(&mp
->hlist
[mdb
->ver
], &mdb
->mhash
[hash
]);
627 struct net_bridge_port_group
*br_multicast_new_port_group(
628 struct net_bridge_port
*port
,
630 struct net_bridge_port_group __rcu
*next
,
633 struct net_bridge_port_group
*p
;
635 p
= kzalloc(sizeof(*p
), GFP_ATOMIC
);
642 rcu_assign_pointer(p
->next
, next
);
643 hlist_add_head(&p
->mglist
, &port
->mglist
);
644 setup_timer(&p
->timer
, br_multicast_port_group_expired
,
649 static int br_multicast_add_group(struct net_bridge
*br
,
650 struct net_bridge_port
*port
,
653 struct net_bridge_mdb_entry
*mp
;
654 struct net_bridge_port_group
*p
;
655 struct net_bridge_port_group __rcu
**pp
;
656 unsigned long now
= jiffies
;
659 spin_lock(&br
->multicast_lock
);
660 if (!netif_running(br
->dev
) ||
661 (port
&& port
->state
== BR_STATE_DISABLED
))
664 mp
= br_multicast_new_group(br
, port
, group
);
671 mod_timer(&mp
->timer
, now
+ br
->multicast_membership_interval
);
675 for (pp
= &mp
->ports
;
676 (p
= mlock_dereference(*pp
, br
)) != NULL
;
680 if ((unsigned long)p
->port
< (unsigned long)port
)
684 p
= br_multicast_new_port_group(port
, group
, *pp
, MDB_TEMPORARY
);
687 rcu_assign_pointer(*pp
, p
);
688 br_mdb_notify(br
->dev
, port
, group
, RTM_NEWMDB
);
691 mod_timer(&p
->timer
, now
+ br
->multicast_membership_interval
);
696 spin_unlock(&br
->multicast_lock
);
700 static int br_ip4_multicast_add_group(struct net_bridge
*br
,
701 struct net_bridge_port
*port
,
705 struct br_ip br_group
;
707 if (ipv4_is_local_multicast(group
))
710 br_group
.u
.ip4
= group
;
711 br_group
.proto
= htons(ETH_P_IP
);
714 return br_multicast_add_group(br
, port
, &br_group
);
717 #if IS_ENABLED(CONFIG_IPV6)
718 static int br_ip6_multicast_add_group(struct net_bridge
*br
,
719 struct net_bridge_port
*port
,
720 const struct in6_addr
*group
,
723 struct br_ip br_group
;
725 if (!ipv6_is_transient_multicast(group
))
728 br_group
.u
.ip6
= *group
;
729 br_group
.proto
= htons(ETH_P_IPV6
);
732 return br_multicast_add_group(br
, port
, &br_group
);
736 static void br_multicast_router_expired(unsigned long data
)
738 struct net_bridge_port
*port
= (void *)data
;
739 struct net_bridge
*br
= port
->br
;
741 spin_lock(&br
->multicast_lock
);
742 if (port
->multicast_router
!= 1 ||
743 timer_pending(&port
->multicast_router_timer
) ||
744 hlist_unhashed(&port
->rlist
))
747 hlist_del_init_rcu(&port
->rlist
);
750 spin_unlock(&br
->multicast_lock
);
753 static void br_multicast_local_router_expired(unsigned long data
)
757 static void br_multicast_querier_expired(unsigned long data
)
759 struct net_bridge
*br
= (void *)data
;
761 spin_lock(&br
->multicast_lock
);
762 if (!netif_running(br
->dev
) || br
->multicast_disabled
)
765 br_multicast_start_querier(br
);
768 spin_unlock(&br
->multicast_lock
);
771 static void __br_multicast_send_query(struct net_bridge
*br
,
772 struct net_bridge_port
*port
,
777 skb
= br_multicast_alloc_query(br
, ip
);
782 __skb_push(skb
, sizeof(struct ethhdr
));
783 skb
->dev
= port
->dev
;
784 NF_HOOK(NFPROTO_BRIDGE
, NF_BR_LOCAL_OUT
, skb
, NULL
, skb
->dev
,
790 static void br_multicast_send_query(struct net_bridge
*br
,
791 struct net_bridge_port
*port
, u32 sent
)
794 struct br_ip br_group
;
796 if (!netif_running(br
->dev
) || br
->multicast_disabled
||
797 !br
->multicast_querier
||
798 timer_pending(&br
->multicast_querier_timer
))
801 memset(&br_group
.u
, 0, sizeof(br_group
.u
));
803 br_group
.proto
= htons(ETH_P_IP
);
804 __br_multicast_send_query(br
, port
, &br_group
);
806 #if IS_ENABLED(CONFIG_IPV6)
807 br_group
.proto
= htons(ETH_P_IPV6
);
808 __br_multicast_send_query(br
, port
, &br_group
);
812 time
+= sent
< br
->multicast_startup_query_count
?
813 br
->multicast_startup_query_interval
:
814 br
->multicast_query_interval
;
815 mod_timer(port
? &port
->multicast_query_timer
:
816 &br
->multicast_query_timer
, time
);
819 static void br_multicast_port_query_expired(unsigned long data
)
821 struct net_bridge_port
*port
= (void *)data
;
822 struct net_bridge
*br
= port
->br
;
824 spin_lock(&br
->multicast_lock
);
825 if (port
->state
== BR_STATE_DISABLED
||
826 port
->state
== BR_STATE_BLOCKING
)
829 if (port
->multicast_startup_queries_sent
<
830 br
->multicast_startup_query_count
)
831 port
->multicast_startup_queries_sent
++;
833 br_multicast_send_query(port
->br
, port
,
834 port
->multicast_startup_queries_sent
);
837 spin_unlock(&br
->multicast_lock
);
840 void br_multicast_add_port(struct net_bridge_port
*port
)
842 port
->multicast_router
= 1;
844 setup_timer(&port
->multicast_router_timer
, br_multicast_router_expired
,
845 (unsigned long)port
);
846 setup_timer(&port
->multicast_query_timer
,
847 br_multicast_port_query_expired
, (unsigned long)port
);
850 void br_multicast_del_port(struct net_bridge_port
*port
)
852 del_timer_sync(&port
->multicast_router_timer
);
855 static void __br_multicast_enable_port(struct net_bridge_port
*port
)
857 port
->multicast_startup_queries_sent
= 0;
859 if (try_to_del_timer_sync(&port
->multicast_query_timer
) >= 0 ||
860 del_timer(&port
->multicast_query_timer
))
861 mod_timer(&port
->multicast_query_timer
, jiffies
);
864 void br_multicast_enable_port(struct net_bridge_port
*port
)
866 struct net_bridge
*br
= port
->br
;
868 spin_lock(&br
->multicast_lock
);
869 if (br
->multicast_disabled
|| !netif_running(br
->dev
))
872 __br_multicast_enable_port(port
);
875 spin_unlock(&br
->multicast_lock
);
878 void br_multicast_disable_port(struct net_bridge_port
*port
)
880 struct net_bridge
*br
= port
->br
;
881 struct net_bridge_port_group
*pg
;
882 struct hlist_node
*n
;
884 spin_lock(&br
->multicast_lock
);
885 hlist_for_each_entry_safe(pg
, n
, &port
->mglist
, mglist
)
886 br_multicast_del_pg(br
, pg
);
888 if (!hlist_unhashed(&port
->rlist
))
889 hlist_del_init_rcu(&port
->rlist
);
890 del_timer(&port
->multicast_router_timer
);
891 del_timer(&port
->multicast_query_timer
);
892 spin_unlock(&br
->multicast_lock
);
895 static int br_ip4_multicast_igmp3_report(struct net_bridge
*br
,
896 struct net_bridge_port
*port
,
899 struct igmpv3_report
*ih
;
900 struct igmpv3_grec
*grec
;
909 if (!pskb_may_pull(skb
, sizeof(*ih
)))
912 br_vlan_get_tag(skb
, &vid
);
913 ih
= igmpv3_report_hdr(skb
);
914 num
= ntohs(ih
->ngrec
);
917 for (i
= 0; i
< num
; i
++) {
918 len
+= sizeof(*grec
);
919 if (!pskb_may_pull(skb
, len
))
922 grec
= (void *)(skb
->data
+ len
- sizeof(*grec
));
923 group
= grec
->grec_mca
;
924 type
= grec
->grec_type
;
926 len
+= ntohs(grec
->grec_nsrcs
) * 4;
927 if (!pskb_may_pull(skb
, len
))
930 /* We treat this as an IGMPv2 report for now. */
932 case IGMPV3_MODE_IS_INCLUDE
:
933 case IGMPV3_MODE_IS_EXCLUDE
:
934 case IGMPV3_CHANGE_TO_INCLUDE
:
935 case IGMPV3_CHANGE_TO_EXCLUDE
:
936 case IGMPV3_ALLOW_NEW_SOURCES
:
937 case IGMPV3_BLOCK_OLD_SOURCES
:
944 err
= br_ip4_multicast_add_group(br
, port
, group
, vid
);
952 #if IS_ENABLED(CONFIG_IPV6)
953 static int br_ip6_multicast_mld2_report(struct net_bridge
*br
,
954 struct net_bridge_port
*port
,
957 struct icmp6hdr
*icmp6h
;
958 struct mld2_grec
*grec
;
965 if (!pskb_may_pull(skb
, sizeof(*icmp6h
)))
968 br_vlan_get_tag(skb
, &vid
);
969 icmp6h
= icmp6_hdr(skb
);
970 num
= ntohs(icmp6h
->icmp6_dataun
.un_data16
[1]);
971 len
= sizeof(*icmp6h
);
973 for (i
= 0; i
< num
; i
++) {
974 __be16
*nsrcs
, _nsrcs
;
976 nsrcs
= skb_header_pointer(skb
,
977 len
+ offsetof(struct mld2_grec
,
979 sizeof(_nsrcs
), &_nsrcs
);
983 if (!pskb_may_pull(skb
,
984 len
+ sizeof(*grec
) +
985 sizeof(struct in6_addr
) * ntohs(*nsrcs
)))
988 grec
= (struct mld2_grec
*)(skb
->data
+ len
);
989 len
+= sizeof(*grec
) +
990 sizeof(struct in6_addr
) * ntohs(*nsrcs
);
992 /* We treat these as MLDv1 reports for now. */
993 switch (grec
->grec_type
) {
994 case MLD2_MODE_IS_INCLUDE
:
995 case MLD2_MODE_IS_EXCLUDE
:
996 case MLD2_CHANGE_TO_INCLUDE
:
997 case MLD2_CHANGE_TO_EXCLUDE
:
998 case MLD2_ALLOW_NEW_SOURCES
:
999 case MLD2_BLOCK_OLD_SOURCES
:
1006 err
= br_ip6_multicast_add_group(br
, port
, &grec
->grec_mca
,
1017 * Add port to rotuer_list
1018 * list is maintained ordered by pointer value
1019 * and locked by br->multicast_lock and RCU
1021 static void br_multicast_add_router(struct net_bridge
*br
,
1022 struct net_bridge_port
*port
)
1024 struct net_bridge_port
*p
;
1025 struct hlist_node
*slot
= NULL
;
1027 hlist_for_each_entry(p
, &br
->router_list
, rlist
) {
1028 if ((unsigned long) port
>= (unsigned long) p
)
1034 hlist_add_after_rcu(slot
, &port
->rlist
);
1036 hlist_add_head_rcu(&port
->rlist
, &br
->router_list
);
1039 static void br_multicast_mark_router(struct net_bridge
*br
,
1040 struct net_bridge_port
*port
)
1042 unsigned long now
= jiffies
;
1045 if (br
->multicast_router
== 1)
1046 mod_timer(&br
->multicast_router_timer
,
1047 now
+ br
->multicast_querier_interval
);
1051 if (port
->multicast_router
!= 1)
1054 if (!hlist_unhashed(&port
->rlist
))
1057 br_multicast_add_router(br
, port
);
1060 mod_timer(&port
->multicast_router_timer
,
1061 now
+ br
->multicast_querier_interval
);
1064 static void br_multicast_query_received(struct net_bridge
*br
,
1065 struct net_bridge_port
*port
,
1069 mod_timer(&br
->multicast_querier_timer
,
1070 jiffies
+ br
->multicast_querier_interval
);
1071 else if (timer_pending(&br
->multicast_querier_timer
))
1074 br_multicast_mark_router(br
, port
);
1077 static int br_ip4_multicast_query(struct net_bridge
*br
,
1078 struct net_bridge_port
*port
,
1079 struct sk_buff
*skb
)
1081 const struct iphdr
*iph
= ip_hdr(skb
);
1082 struct igmphdr
*ih
= igmp_hdr(skb
);
1083 struct net_bridge_mdb_entry
*mp
;
1084 struct igmpv3_query
*ih3
;
1085 struct net_bridge_port_group
*p
;
1086 struct net_bridge_port_group __rcu
**pp
;
1087 unsigned long max_delay
;
1088 unsigned long now
= jiffies
;
1093 spin_lock(&br
->multicast_lock
);
1094 if (!netif_running(br
->dev
) ||
1095 (port
&& port
->state
== BR_STATE_DISABLED
))
1098 br_multicast_query_received(br
, port
, !!iph
->saddr
);
1102 if (skb
->len
== sizeof(*ih
)) {
1103 max_delay
= ih
->code
* (HZ
/ IGMP_TIMER_SCALE
);
1106 max_delay
= 10 * HZ
;
1110 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
))) {
1115 ih3
= igmpv3_query_hdr(skb
);
1119 max_delay
= ih3
->code
?
1120 IGMPV3_MRC(ih3
->code
) * (HZ
/ IGMP_TIMER_SCALE
) : 1;
1126 br_vlan_get_tag(skb
, &vid
);
1127 mp
= br_mdb_ip4_get(mlock_dereference(br
->mdb
, br
), group
, vid
);
1131 max_delay
*= br
->multicast_last_member_count
;
1134 (timer_pending(&mp
->timer
) ?
1135 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1136 try_to_del_timer_sync(&mp
->timer
) >= 0))
1137 mod_timer(&mp
->timer
, now
+ max_delay
);
1139 for (pp
= &mp
->ports
;
1140 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1142 if (timer_pending(&p
->timer
) ?
1143 time_after(p
->timer
.expires
, now
+ max_delay
) :
1144 try_to_del_timer_sync(&p
->timer
) >= 0)
1145 mod_timer(&p
->timer
, now
+ max_delay
);
1149 spin_unlock(&br
->multicast_lock
);
1153 #if IS_ENABLED(CONFIG_IPV6)
1154 static int br_ip6_multicast_query(struct net_bridge
*br
,
1155 struct net_bridge_port
*port
,
1156 struct sk_buff
*skb
)
1158 const struct ipv6hdr
*ip6h
= ipv6_hdr(skb
);
1159 struct mld_msg
*mld
;
1160 struct net_bridge_mdb_entry
*mp
;
1161 struct mld2_query
*mld2q
;
1162 struct net_bridge_port_group
*p
;
1163 struct net_bridge_port_group __rcu
**pp
;
1164 unsigned long max_delay
;
1165 unsigned long now
= jiffies
;
1166 const struct in6_addr
*group
= NULL
;
1170 spin_lock(&br
->multicast_lock
);
1171 if (!netif_running(br
->dev
) ||
1172 (port
&& port
->state
== BR_STATE_DISABLED
))
1175 br_multicast_query_received(br
, port
, !ipv6_addr_any(&ip6h
->saddr
));
1177 if (skb
->len
== sizeof(*mld
)) {
1178 if (!pskb_may_pull(skb
, sizeof(*mld
))) {
1182 mld
= (struct mld_msg
*) icmp6_hdr(skb
);
1183 max_delay
= msecs_to_jiffies(ntohs(mld
->mld_maxdelay
));
1185 group
= &mld
->mld_mca
;
1186 } else if (skb
->len
>= sizeof(*mld2q
)) {
1187 if (!pskb_may_pull(skb
, sizeof(*mld2q
))) {
1191 mld2q
= (struct mld2_query
*)icmp6_hdr(skb
);
1192 if (!mld2q
->mld2q_nsrcs
)
1193 group
= &mld2q
->mld2q_mca
;
1194 max_delay
= mld2q
->mld2q_mrc
? MLDV2_MRC(ntohs(mld2q
->mld2q_mrc
)) : 1;
1200 br_vlan_get_tag(skb
, &vid
);
1201 mp
= br_mdb_ip6_get(mlock_dereference(br
->mdb
, br
), group
, vid
);
1205 max_delay
*= br
->multicast_last_member_count
;
1207 (timer_pending(&mp
->timer
) ?
1208 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1209 try_to_del_timer_sync(&mp
->timer
) >= 0))
1210 mod_timer(&mp
->timer
, now
+ max_delay
);
1212 for (pp
= &mp
->ports
;
1213 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1215 if (timer_pending(&p
->timer
) ?
1216 time_after(p
->timer
.expires
, now
+ max_delay
) :
1217 try_to_del_timer_sync(&p
->timer
) >= 0)
1218 mod_timer(&p
->timer
, now
+ max_delay
);
1222 spin_unlock(&br
->multicast_lock
);
1227 static void br_multicast_leave_group(struct net_bridge
*br
,
1228 struct net_bridge_port
*port
,
1229 struct br_ip
*group
)
1231 struct net_bridge_mdb_htable
*mdb
;
1232 struct net_bridge_mdb_entry
*mp
;
1233 struct net_bridge_port_group
*p
;
1237 spin_lock(&br
->multicast_lock
);
1238 if (!netif_running(br
->dev
) ||
1239 (port
&& port
->state
== BR_STATE_DISABLED
) ||
1240 timer_pending(&br
->multicast_querier_timer
))
1243 mdb
= mlock_dereference(br
->mdb
, br
);
1244 mp
= br_mdb_ip_get(mdb
, group
);
1248 if (port
&& (port
->flags
& BR_MULTICAST_FAST_LEAVE
)) {
1249 struct net_bridge_port_group __rcu
**pp
;
1251 for (pp
= &mp
->ports
;
1252 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1254 if (p
->port
!= port
)
1257 rcu_assign_pointer(*pp
, p
->next
);
1258 hlist_del_init(&p
->mglist
);
1259 del_timer(&p
->timer
);
1260 call_rcu_bh(&p
->rcu
, br_multicast_free_pg
);
1261 br_mdb_notify(br
->dev
, port
, group
, RTM_DELMDB
);
1263 if (!mp
->ports
&& !mp
->mglist
&&
1264 netif_running(br
->dev
))
1265 mod_timer(&mp
->timer
, jiffies
);
1271 time
= now
+ br
->multicast_last_member_count
*
1272 br
->multicast_last_member_interval
;
1276 (timer_pending(&mp
->timer
) ?
1277 time_after(mp
->timer
.expires
, time
) :
1278 try_to_del_timer_sync(&mp
->timer
) >= 0)) {
1279 mod_timer(&mp
->timer
, time
);
1285 for (p
= mlock_dereference(mp
->ports
, br
);
1287 p
= mlock_dereference(p
->next
, br
)) {
1288 if (p
->port
!= port
)
1291 if (!hlist_unhashed(&p
->mglist
) &&
1292 (timer_pending(&p
->timer
) ?
1293 time_after(p
->timer
.expires
, time
) :
1294 try_to_del_timer_sync(&p
->timer
) >= 0)) {
1295 mod_timer(&p
->timer
, time
);
1302 spin_unlock(&br
->multicast_lock
);
1305 static void br_ip4_multicast_leave_group(struct net_bridge
*br
,
1306 struct net_bridge_port
*port
,
1310 struct br_ip br_group
;
1312 if (ipv4_is_local_multicast(group
))
1315 br_group
.u
.ip4
= group
;
1316 br_group
.proto
= htons(ETH_P_IP
);
1319 br_multicast_leave_group(br
, port
, &br_group
);
1322 #if IS_ENABLED(CONFIG_IPV6)
1323 static void br_ip6_multicast_leave_group(struct net_bridge
*br
,
1324 struct net_bridge_port
*port
,
1325 const struct in6_addr
*group
,
1328 struct br_ip br_group
;
1330 if (!ipv6_is_transient_multicast(group
))
1333 br_group
.u
.ip6
= *group
;
1334 br_group
.proto
= htons(ETH_P_IPV6
);
1337 br_multicast_leave_group(br
, port
, &br_group
);
1341 static int br_multicast_ipv4_rcv(struct net_bridge
*br
,
1342 struct net_bridge_port
*port
,
1343 struct sk_buff
*skb
)
1345 struct sk_buff
*skb2
= skb
;
1346 const struct iphdr
*iph
;
1349 unsigned int offset
;
1353 /* We treat OOM as packet loss for now. */
1354 if (!pskb_may_pull(skb
, sizeof(*iph
)))
1359 if (iph
->ihl
< 5 || iph
->version
!= 4)
1362 if (!pskb_may_pull(skb
, ip_hdrlen(skb
)))
1367 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1370 if (iph
->protocol
!= IPPROTO_IGMP
) {
1371 if ((iph
->daddr
& IGMP_LOCAL_GROUP_MASK
) != IGMP_LOCAL_GROUP
)
1372 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1376 len
= ntohs(iph
->tot_len
);
1377 if (skb
->len
< len
|| len
< ip_hdrlen(skb
))
1380 if (skb
->len
> len
) {
1381 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1385 err
= pskb_trim_rcsum(skb2
, len
);
1390 len
-= ip_hdrlen(skb2
);
1391 offset
= skb_network_offset(skb2
) + ip_hdrlen(skb2
);
1392 __skb_pull(skb2
, offset
);
1393 skb_reset_transport_header(skb2
);
1396 if (!pskb_may_pull(skb2
, sizeof(*ih
)))
1399 switch (skb2
->ip_summed
) {
1400 case CHECKSUM_COMPLETE
:
1401 if (!csum_fold(skb2
->csum
))
1406 if (skb_checksum_complete(skb2
))
1412 br_vlan_get_tag(skb2
, &vid
);
1413 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1414 ih
= igmp_hdr(skb2
);
1417 case IGMP_HOST_MEMBERSHIP_REPORT
:
1418 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1419 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1420 err
= br_ip4_multicast_add_group(br
, port
, ih
->group
, vid
);
1422 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1423 err
= br_ip4_multicast_igmp3_report(br
, port
, skb2
);
1425 case IGMP_HOST_MEMBERSHIP_QUERY
:
1426 err
= br_ip4_multicast_query(br
, port
, skb2
);
1428 case IGMP_HOST_LEAVE_MESSAGE
:
1429 br_ip4_multicast_leave_group(br
, port
, ih
->group
, vid
);
1434 __skb_push(skb2
, offset
);
1441 #if IS_ENABLED(CONFIG_IPV6)
1442 static int br_multicast_ipv6_rcv(struct net_bridge
*br
,
1443 struct net_bridge_port
*port
,
1444 struct sk_buff
*skb
)
1446 struct sk_buff
*skb2
;
1447 const struct ipv6hdr
*ip6h
;
1456 if (!pskb_may_pull(skb
, sizeof(*ip6h
)))
1459 ip6h
= ipv6_hdr(skb
);
1462 * We're interested in MLD messages only.
1464 * - MLD has always Router Alert hop-by-hop option
1465 * - But we do not support jumbrograms.
1467 if (ip6h
->version
!= 6 ||
1468 ip6h
->nexthdr
!= IPPROTO_HOPOPTS
||
1469 ip6h
->payload_len
== 0)
1472 len
= ntohs(ip6h
->payload_len
) + sizeof(*ip6h
);
1476 nexthdr
= ip6h
->nexthdr
;
1477 offset
= ipv6_skip_exthdr(skb
, sizeof(*ip6h
), &nexthdr
, &frag_off
);
1479 if (offset
< 0 || nexthdr
!= IPPROTO_ICMPV6
)
1482 /* Okay, we found ICMPv6 header */
1483 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1488 if (!pskb_may_pull(skb2
, offset
+ sizeof(struct icmp6hdr
)))
1491 len
-= offset
- skb_network_offset(skb2
);
1493 __skb_pull(skb2
, offset
);
1494 skb_reset_transport_header(skb2
);
1495 skb_postpull_rcsum(skb2
, skb_network_header(skb2
),
1496 skb_network_header_len(skb2
));
1498 icmp6_type
= icmp6_hdr(skb2
)->icmp6_type
;
1500 switch (icmp6_type
) {
1501 case ICMPV6_MGM_QUERY
:
1502 case ICMPV6_MGM_REPORT
:
1503 case ICMPV6_MGM_REDUCTION
:
1504 case ICMPV6_MLD2_REPORT
:
1511 /* Okay, we found MLD message. Check further. */
1512 if (skb2
->len
> len
) {
1513 err
= pskb_trim_rcsum(skb2
, len
);
1519 ip6h
= ipv6_hdr(skb2
);
1521 switch (skb2
->ip_summed
) {
1522 case CHECKSUM_COMPLETE
:
1523 if (!csum_ipv6_magic(&ip6h
->saddr
, &ip6h
->daddr
, skb2
->len
,
1524 IPPROTO_ICMPV6
, skb2
->csum
))
1528 skb2
->csum
= ~csum_unfold(csum_ipv6_magic(&ip6h
->saddr
,
1531 IPPROTO_ICMPV6
, 0));
1532 if (__skb_checksum_complete(skb2
))
1538 br_vlan_get_tag(skb
, &vid
);
1539 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1541 switch (icmp6_type
) {
1542 case ICMPV6_MGM_REPORT
:
1544 struct mld_msg
*mld
;
1545 if (!pskb_may_pull(skb2
, sizeof(*mld
))) {
1549 mld
= (struct mld_msg
*)skb_transport_header(skb2
);
1550 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1551 err
= br_ip6_multicast_add_group(br
, port
, &mld
->mld_mca
, vid
);
1554 case ICMPV6_MLD2_REPORT
:
1555 err
= br_ip6_multicast_mld2_report(br
, port
, skb2
);
1557 case ICMPV6_MGM_QUERY
:
1558 err
= br_ip6_multicast_query(br
, port
, skb2
);
1560 case ICMPV6_MGM_REDUCTION
:
1562 struct mld_msg
*mld
;
1563 if (!pskb_may_pull(skb2
, sizeof(*mld
))) {
1567 mld
= (struct mld_msg
*)skb_transport_header(skb2
);
1568 br_ip6_multicast_leave_group(br
, port
, &mld
->mld_mca
, vid
);
1578 int br_multicast_rcv(struct net_bridge
*br
, struct net_bridge_port
*port
,
1579 struct sk_buff
*skb
)
1581 BR_INPUT_SKB_CB(skb
)->igmp
= 0;
1582 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 0;
1584 if (br
->multicast_disabled
)
1587 switch (skb
->protocol
) {
1588 case htons(ETH_P_IP
):
1589 return br_multicast_ipv4_rcv(br
, port
, skb
);
1590 #if IS_ENABLED(CONFIG_IPV6)
1591 case htons(ETH_P_IPV6
):
1592 return br_multicast_ipv6_rcv(br
, port
, skb
);
1599 static void br_multicast_query_expired(unsigned long data
)
1601 struct net_bridge
*br
= (void *)data
;
1603 spin_lock(&br
->multicast_lock
);
1604 if (br
->multicast_startup_queries_sent
<
1605 br
->multicast_startup_query_count
)
1606 br
->multicast_startup_queries_sent
++;
1608 br_multicast_send_query(br
, NULL
, br
->multicast_startup_queries_sent
);
1610 spin_unlock(&br
->multicast_lock
);
1613 void br_multicast_init(struct net_bridge
*br
)
1615 br
->hash_elasticity
= 4;
1618 br
->multicast_router
= 1;
1619 br
->multicast_querier
= 0;
1620 br
->multicast_last_member_count
= 2;
1621 br
->multicast_startup_query_count
= 2;
1623 br
->multicast_last_member_interval
= HZ
;
1624 br
->multicast_query_response_interval
= 10 * HZ
;
1625 br
->multicast_startup_query_interval
= 125 * HZ
/ 4;
1626 br
->multicast_query_interval
= 125 * HZ
;
1627 br
->multicast_querier_interval
= 255 * HZ
;
1628 br
->multicast_membership_interval
= 260 * HZ
;
1630 spin_lock_init(&br
->multicast_lock
);
1631 setup_timer(&br
->multicast_router_timer
,
1632 br_multicast_local_router_expired
, 0);
1633 setup_timer(&br
->multicast_querier_timer
,
1634 br_multicast_querier_expired
, (unsigned long)br
);
1635 setup_timer(&br
->multicast_query_timer
, br_multicast_query_expired
,
1639 void br_multicast_open(struct net_bridge
*br
)
1641 br
->multicast_startup_queries_sent
= 0;
1643 if (br
->multicast_disabled
)
1646 mod_timer(&br
->multicast_query_timer
, jiffies
);
1649 void br_multicast_stop(struct net_bridge
*br
)
1651 struct net_bridge_mdb_htable
*mdb
;
1652 struct net_bridge_mdb_entry
*mp
;
1653 struct hlist_node
*n
;
1657 del_timer_sync(&br
->multicast_router_timer
);
1658 del_timer_sync(&br
->multicast_querier_timer
);
1659 del_timer_sync(&br
->multicast_query_timer
);
1661 spin_lock_bh(&br
->multicast_lock
);
1662 mdb
= mlock_dereference(br
->mdb
, br
);
1669 for (i
= 0; i
< mdb
->max
; i
++) {
1670 hlist_for_each_entry_safe(mp
, n
, &mdb
->mhash
[i
],
1672 del_timer(&mp
->timer
);
1673 call_rcu_bh(&mp
->rcu
, br_multicast_free_group
);
1678 spin_unlock_bh(&br
->multicast_lock
);
1680 spin_lock_bh(&br
->multicast_lock
);
1685 call_rcu_bh(&mdb
->rcu
, br_mdb_free
);
1688 spin_unlock_bh(&br
->multicast_lock
);
1691 int br_multicast_set_router(struct net_bridge
*br
, unsigned long val
)
1695 spin_lock_bh(&br
->multicast_lock
);
1696 if (!netif_running(br
->dev
))
1702 del_timer(&br
->multicast_router_timer
);
1705 br
->multicast_router
= val
;
1715 spin_unlock_bh(&br
->multicast_lock
);
1720 int br_multicast_set_port_router(struct net_bridge_port
*p
, unsigned long val
)
1722 struct net_bridge
*br
= p
->br
;
1725 spin_lock(&br
->multicast_lock
);
1726 if (!netif_running(br
->dev
) || p
->state
== BR_STATE_DISABLED
)
1733 p
->multicast_router
= val
;
1736 if (val
< 2 && !hlist_unhashed(&p
->rlist
))
1737 hlist_del_init_rcu(&p
->rlist
);
1742 del_timer(&p
->multicast_router_timer
);
1747 br_multicast_add_router(br
, p
);
1756 spin_unlock(&br
->multicast_lock
);
1761 static void br_multicast_start_querier(struct net_bridge
*br
)
1763 struct net_bridge_port
*port
;
1765 br_multicast_open(br
);
1767 list_for_each_entry(port
, &br
->port_list
, list
) {
1768 if (port
->state
== BR_STATE_DISABLED
||
1769 port
->state
== BR_STATE_BLOCKING
)
1772 __br_multicast_enable_port(port
);
1776 int br_multicast_toggle(struct net_bridge
*br
, unsigned long val
)
1779 struct net_bridge_mdb_htable
*mdb
;
1781 spin_lock_bh(&br
->multicast_lock
);
1782 if (br
->multicast_disabled
== !val
)
1785 br
->multicast_disabled
= !val
;
1786 if (br
->multicast_disabled
)
1789 if (!netif_running(br
->dev
))
1792 mdb
= mlock_dereference(br
->mdb
, br
);
1797 br
->multicast_disabled
= !!val
;
1801 err
= br_mdb_rehash(&br
->mdb
, mdb
->max
,
1802 br
->hash_elasticity
);
1807 br_multicast_start_querier(br
);
1810 spin_unlock_bh(&br
->multicast_lock
);
1815 int br_multicast_set_querier(struct net_bridge
*br
, unsigned long val
)
1819 spin_lock_bh(&br
->multicast_lock
);
1820 if (br
->multicast_querier
== val
)
1823 br
->multicast_querier
= val
;
1825 br_multicast_start_querier(br
);
1828 spin_unlock_bh(&br
->multicast_lock
);
1833 int br_multicast_set_hash_max(struct net_bridge
*br
, unsigned long val
)
1837 struct net_bridge_mdb_htable
*mdb
;
1839 spin_lock(&br
->multicast_lock
);
1840 if (!netif_running(br
->dev
))
1844 if (!is_power_of_2(val
))
1847 mdb
= mlock_dereference(br
->mdb
, br
);
1848 if (mdb
&& val
< mdb
->size
)
1864 err
= br_mdb_rehash(&br
->mdb
, br
->hash_max
,
1865 br
->hash_elasticity
);
1871 spin_unlock(&br
->multicast_lock
);