2 * Bridge multicast support.
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
13 #include <linux/err.h>
14 #include <linux/export.h>
15 #include <linux/if_ether.h>
16 #include <linux/igmp.h>
18 #include <linux/jhash.h>
19 #include <linux/kernel.h>
20 #include <linux/log2.h>
21 #include <linux/netdevice.h>
22 #include <linux/netfilter_bridge.h>
23 #include <linux/random.h>
24 #include <linux/rculist.h>
25 #include <linux/skbuff.h>
26 #include <linux/slab.h>
27 #include <linux/timer.h>
28 #include <linux/inetdevice.h>
29 #include <linux/mroute.h>
31 #include <net/switchdev.h>
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <linux/icmpv6.h>
36 #include <net/ip6_checksum.h>
37 #include <net/addrconf.h>
40 #include "br_private.h"
42 static const struct rhashtable_params br_mdb_rht_params = {
43 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
44 .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
45 .key_len = sizeof(struct br_ip),
46 .automatic_shrinking = true,
49 static void br_multicast_start_querier(struct net_bridge *br,
50 struct bridge_mcast_own_query *query);
51 static void br_multicast_add_router(struct net_bridge *br,
52 struct net_bridge_port *port);
53 static void br_ip4_multicast_leave_group(struct net_bridge *br,
54 struct net_bridge_port *port,
57 const unsigned char *src);
59 static void __del_port_router(struct net_bridge_port *p);
60 #if IS_ENABLED(CONFIG_IPV6)
61 static void br_ip6_multicast_leave_group(struct net_bridge *br,
62 struct net_bridge_port *port,
63 const struct in6_addr *group,
64 __u16 vid, const unsigned char *src);
67 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
70 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
73 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
76 struct net_bridge_mdb_entry *ent;
78 lockdep_assert_held_once(&br->multicast_lock);
81 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
87 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
88 __be32 dst, __u16 vid)
92 memset(&br_dst, 0, sizeof(br_dst));
94 br_dst.proto = htons(ETH_P_IP);
97 return br_mdb_ip_get(br, &br_dst);
100 #if IS_ENABLED(CONFIG_IPV6)
101 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
102 const struct in6_addr *dst,
107 memset(&br_dst, 0, sizeof(br_dst));
109 br_dst.proto = htons(ETH_P_IPV6);
112 return br_mdb_ip_get(br, &br_dst);
116 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
117 struct sk_buff *skb, u16 vid)
121 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
124 if (BR_INPUT_SKB_CB(skb)->igmp)
127 memset(&ip, 0, sizeof(ip));
128 ip.proto = skb->protocol;
131 switch (skb->protocol) {
132 case htons(ETH_P_IP):
133 ip.u.ip4 = ip_hdr(skb)->daddr;
135 #if IS_ENABLED(CONFIG_IPV6)
136 case htons(ETH_P_IPV6):
137 ip.u.ip6 = ipv6_hdr(skb)->daddr;
144 return br_mdb_ip_get_rcu(br, &ip);
147 static void br_multicast_group_expired(struct timer_list *t)
149 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
150 struct net_bridge *br = mp->br;
152 spin_lock(&br->multicast_lock);
153 if (!netif_running(br->dev) || timer_pending(&mp->timer))
156 mp->host_joined = false;
157 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
162 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
164 hlist_del_rcu(&mp->mdb_node);
169 spin_unlock(&br->multicast_lock);
172 static void br_multicast_del_pg(struct net_bridge *br,
173 struct net_bridge_port_group *pg)
175 struct net_bridge_mdb_entry *mp;
176 struct net_bridge_port_group *p;
177 struct net_bridge_port_group __rcu **pp;
179 mp = br_mdb_ip_get(br, &pg->addr);
183 for (pp = &mp->ports;
184 (p = mlock_dereference(*pp, br)) != NULL;
189 rcu_assign_pointer(*pp, p->next);
190 hlist_del_init(&p->mglist);
191 del_timer(&p->timer);
192 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
196 if (!mp->ports && !mp->host_joined &&
197 netif_running(br->dev))
198 mod_timer(&mp->timer, jiffies);
206 static void br_multicast_port_group_expired(struct timer_list *t)
208 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
209 struct net_bridge *br = pg->port->br;
211 spin_lock(&br->multicast_lock);
212 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
213 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
216 br_multicast_del_pg(br, pg);
219 spin_unlock(&br->multicast_lock);
222 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
226 struct igmpv3_query *ihv3;
227 size_t igmp_hdr_size;
233 igmp_hdr_size = sizeof(*ih);
234 if (br->multicast_igmp_version == 3)
235 igmp_hdr_size = sizeof(*ihv3);
236 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
241 skb->protocol = htons(ETH_P_IP);
243 skb_reset_mac_header(skb);
246 ether_addr_copy(eth->h_source, br->dev->dev_addr);
249 eth->h_dest[2] = 0x5e;
253 eth->h_proto = htons(ETH_P_IP);
254 skb_put(skb, sizeof(*eth));
256 skb_set_network_header(skb, skb->len);
262 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
264 iph->frag_off = htons(IP_DF);
266 iph->protocol = IPPROTO_IGMP;
267 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
268 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
269 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
270 ((u8 *)&iph[1])[0] = IPOPT_RA;
271 ((u8 *)&iph[1])[1] = 4;
272 ((u8 *)&iph[1])[2] = 0;
273 ((u8 *)&iph[1])[3] = 0;
277 skb_set_transport_header(skb, skb->len);
278 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
280 switch (br->multicast_igmp_version) {
283 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
284 ih->code = (group ? br->multicast_last_member_interval :
285 br->multicast_query_response_interval) /
286 (HZ / IGMP_TIMER_SCALE);
289 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
292 ihv3 = igmpv3_query_hdr(skb);
293 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
294 ihv3->code = (group ? br->multicast_last_member_interval :
295 br->multicast_query_response_interval) /
296 (HZ / IGMP_TIMER_SCALE);
298 ihv3->qqic = br->multicast_query_interval / HZ;
304 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
308 skb_put(skb, igmp_hdr_size);
309 __skb_pull(skb, sizeof(*eth));
315 #if IS_ENABLED(CONFIG_IPV6)
316 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
317 const struct in6_addr *grp,
320 struct mld2_query *mld2q;
321 unsigned long interval;
322 struct ipv6hdr *ip6h;
323 struct mld_msg *mldq;
329 mld_hdr_size = sizeof(*mldq);
330 if (br->multicast_mld_version == 2)
331 mld_hdr_size = sizeof(*mld2q);
332 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
337 skb->protocol = htons(ETH_P_IPV6);
339 /* Ethernet header */
340 skb_reset_mac_header(skb);
343 ether_addr_copy(eth->h_source, br->dev->dev_addr);
344 eth->h_proto = htons(ETH_P_IPV6);
345 skb_put(skb, sizeof(*eth));
347 /* IPv6 header + HbH option */
348 skb_set_network_header(skb, skb->len);
349 ip6h = ipv6_hdr(skb);
351 *(__force __be32 *)ip6h = htonl(0x60000000);
352 ip6h->payload_len = htons(8 + mld_hdr_size);
353 ip6h->nexthdr = IPPROTO_HOPOPTS;
355 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
356 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
359 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
363 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
364 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
366 hopopt = (u8 *)(ip6h + 1);
367 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
368 hopopt[1] = 0; /* length of HbH */
369 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
370 hopopt[3] = 2; /* Length of RA Option */
371 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
373 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
374 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
376 skb_put(skb, sizeof(*ip6h) + 8);
379 skb_set_transport_header(skb, skb->len);
380 interval = ipv6_addr_any(grp) ?
381 br->multicast_query_response_interval :
382 br->multicast_last_member_interval;
383 *igmp_type = ICMPV6_MGM_QUERY;
384 switch (br->multicast_mld_version) {
386 mldq = (struct mld_msg *)icmp6_hdr(skb);
387 mldq->mld_type = ICMPV6_MGM_QUERY;
390 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
391 mldq->mld_reserved = 0;
392 mldq->mld_mca = *grp;
393 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
394 sizeof(*mldq), IPPROTO_ICMPV6,
400 mld2q = (struct mld2_query *)icmp6_hdr(skb);
401 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
402 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
403 mld2q->mld2q_code = 0;
404 mld2q->mld2q_cksum = 0;
405 mld2q->mld2q_resv1 = 0;
406 mld2q->mld2q_resv2 = 0;
407 mld2q->mld2q_suppress = 0;
408 mld2q->mld2q_qrv = 2;
409 mld2q->mld2q_nsrcs = 0;
410 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
411 mld2q->mld2q_mca = *grp;
412 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
420 skb_put(skb, mld_hdr_size);
422 __skb_pull(skb, sizeof(*eth));
429 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
433 switch (addr->proto) {
434 case htons(ETH_P_IP):
435 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
436 #if IS_ENABLED(CONFIG_IPV6)
437 case htons(ETH_P_IPV6):
438 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
445 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
448 struct net_bridge_mdb_entry *mp;
451 mp = br_mdb_ip_get(br, group);
455 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
456 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
457 return ERR_PTR(-E2BIG);
460 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
462 return ERR_PTR(-ENOMEM);
466 timer_setup(&mp->timer, br_multicast_group_expired, 0);
467 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
473 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
479 struct net_bridge_port_group *br_multicast_new_port_group(
480 struct net_bridge_port *port,
482 struct net_bridge_port_group __rcu *next,
484 const unsigned char *src)
486 struct net_bridge_port_group *p;
488 p = kzalloc(sizeof(*p), GFP_ATOMIC);
495 rcu_assign_pointer(p->next, next);
496 hlist_add_head(&p->mglist, &port->mglist);
497 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
500 memcpy(p->eth_addr, src, ETH_ALEN);
502 eth_broadcast_addr(p->eth_addr);
507 static bool br_port_group_equal(struct net_bridge_port_group *p,
508 struct net_bridge_port *port,
509 const unsigned char *src)
514 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
517 return ether_addr_equal(src, p->eth_addr);
520 static int br_multicast_add_group(struct net_bridge *br,
521 struct net_bridge_port *port,
523 const unsigned char *src)
525 struct net_bridge_port_group __rcu **pp;
526 struct net_bridge_port_group *p;
527 struct net_bridge_mdb_entry *mp;
528 unsigned long now = jiffies;
531 spin_lock(&br->multicast_lock);
532 if (!netif_running(br->dev) ||
533 (port && port->state == BR_STATE_DISABLED))
536 mp = br_multicast_new_group(br, group);
542 if (!mp->host_joined) {
543 mp->host_joined = true;
544 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
546 mod_timer(&mp->timer, now + br->multicast_membership_interval);
550 for (pp = &mp->ports;
551 (p = mlock_dereference(*pp, br)) != NULL;
553 if (br_port_group_equal(p, port, src))
555 if ((unsigned long)p->port < (unsigned long)port)
559 p = br_multicast_new_port_group(port, group, *pp, 0, src);
562 rcu_assign_pointer(*pp, p);
563 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
566 mod_timer(&p->timer, now + br->multicast_membership_interval);
571 spin_unlock(&br->multicast_lock);
575 static int br_ip4_multicast_add_group(struct net_bridge *br,
576 struct net_bridge_port *port,
579 const unsigned char *src)
581 struct br_ip br_group;
583 if (ipv4_is_local_multicast(group))
586 memset(&br_group, 0, sizeof(br_group));
587 br_group.u.ip4 = group;
588 br_group.proto = htons(ETH_P_IP);
591 return br_multicast_add_group(br, port, &br_group, src);
594 #if IS_ENABLED(CONFIG_IPV6)
595 static int br_ip6_multicast_add_group(struct net_bridge *br,
596 struct net_bridge_port *port,
597 const struct in6_addr *group,
599 const unsigned char *src)
601 struct br_ip br_group;
603 if (ipv6_addr_is_ll_all_nodes(group))
606 memset(&br_group, 0, sizeof(br_group));
607 br_group.u.ip6 = *group;
608 br_group.proto = htons(ETH_P_IPV6);
611 return br_multicast_add_group(br, port, &br_group, src);
615 static void br_multicast_router_expired(struct timer_list *t)
617 struct net_bridge_port *port =
618 from_timer(port, t, multicast_router_timer);
619 struct net_bridge *br = port->br;
621 spin_lock(&br->multicast_lock);
622 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
623 port->multicast_router == MDB_RTR_TYPE_PERM ||
624 timer_pending(&port->multicast_router_timer))
627 __del_port_router(port);
629 spin_unlock(&br->multicast_lock);
632 static void br_mc_router_state_change(struct net_bridge *p,
635 struct switchdev_attr attr = {
637 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
638 .flags = SWITCHDEV_F_DEFER,
639 .u.mrouter = is_mc_router,
642 switchdev_port_attr_set(p->dev, &attr);
645 static void br_multicast_local_router_expired(struct timer_list *t)
647 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
649 spin_lock(&br->multicast_lock);
650 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
651 br->multicast_router == MDB_RTR_TYPE_PERM ||
652 timer_pending(&br->multicast_router_timer))
655 br_mc_router_state_change(br, false);
657 spin_unlock(&br->multicast_lock);
660 static void br_multicast_querier_expired(struct net_bridge *br,
661 struct bridge_mcast_own_query *query)
663 spin_lock(&br->multicast_lock);
664 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
667 br_multicast_start_querier(br, query);
670 spin_unlock(&br->multicast_lock);
673 static void br_ip4_multicast_querier_expired(struct timer_list *t)
675 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
677 br_multicast_querier_expired(br, &br->ip4_own_query);
680 #if IS_ENABLED(CONFIG_IPV6)
681 static void br_ip6_multicast_querier_expired(struct timer_list *t)
683 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
685 br_multicast_querier_expired(br, &br->ip6_own_query);
689 static void br_multicast_select_own_querier(struct net_bridge *br,
693 if (ip->proto == htons(ETH_P_IP))
694 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
695 #if IS_ENABLED(CONFIG_IPV6)
697 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
701 static void __br_multicast_send_query(struct net_bridge *br,
702 struct net_bridge_port *port,
708 skb = br_multicast_alloc_query(br, ip, &igmp_type);
713 skb->dev = port->dev;
714 br_multicast_count(br, port, skb, igmp_type,
716 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
717 dev_net(port->dev), NULL, skb, NULL, skb->dev,
718 br_dev_queue_push_xmit);
720 br_multicast_select_own_querier(br, ip, skb);
721 br_multicast_count(br, port, skb, igmp_type,
727 static void br_multicast_send_query(struct net_bridge *br,
728 struct net_bridge_port *port,
729 struct bridge_mcast_own_query *own_query)
731 struct bridge_mcast_other_query *other_query = NULL;
732 struct br_ip br_group;
735 if (!netif_running(br->dev) ||
736 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
737 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
740 memset(&br_group.u, 0, sizeof(br_group.u));
742 if (port ? (own_query == &port->ip4_own_query) :
743 (own_query == &br->ip4_own_query)) {
744 other_query = &br->ip4_other_query;
745 br_group.proto = htons(ETH_P_IP);
746 #if IS_ENABLED(CONFIG_IPV6)
748 other_query = &br->ip6_other_query;
749 br_group.proto = htons(ETH_P_IPV6);
753 if (!other_query || timer_pending(&other_query->timer))
756 __br_multicast_send_query(br, port, &br_group);
759 time += own_query->startup_sent < br->multicast_startup_query_count ?
760 br->multicast_startup_query_interval :
761 br->multicast_query_interval;
762 mod_timer(&own_query->timer, time);
766 br_multicast_port_query_expired(struct net_bridge_port *port,
767 struct bridge_mcast_own_query *query)
769 struct net_bridge *br = port->br;
771 spin_lock(&br->multicast_lock);
772 if (port->state == BR_STATE_DISABLED ||
773 port->state == BR_STATE_BLOCKING)
776 if (query->startup_sent < br->multicast_startup_query_count)
777 query->startup_sent++;
779 br_multicast_send_query(port->br, port, query);
782 spin_unlock(&br->multicast_lock);
785 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
787 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
789 br_multicast_port_query_expired(port, &port->ip4_own_query);
792 #if IS_ENABLED(CONFIG_IPV6)
793 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
795 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
797 br_multicast_port_query_expired(port, &port->ip6_own_query);
801 static void br_mc_disabled_update(struct net_device *dev, bool value)
803 struct switchdev_attr attr = {
805 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
806 .flags = SWITCHDEV_F_DEFER,
807 .u.mc_disabled = !value,
810 switchdev_port_attr_set(dev, &attr);
813 int br_multicast_add_port(struct net_bridge_port *port)
815 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
817 timer_setup(&port->multicast_router_timer,
818 br_multicast_router_expired, 0);
819 timer_setup(&port->ip4_own_query.timer,
820 br_ip4_multicast_port_query_expired, 0);
821 #if IS_ENABLED(CONFIG_IPV6)
822 timer_setup(&port->ip6_own_query.timer,
823 br_ip6_multicast_port_query_expired, 0);
825 br_mc_disabled_update(port->dev,
826 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
828 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
829 if (!port->mcast_stats)
835 void br_multicast_del_port(struct net_bridge_port *port)
837 struct net_bridge *br = port->br;
838 struct net_bridge_port_group *pg;
839 struct hlist_node *n;
841 /* Take care of the remaining groups, only perm ones should be left */
842 spin_lock_bh(&br->multicast_lock);
843 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
844 br_multicast_del_pg(br, pg);
845 spin_unlock_bh(&br->multicast_lock);
846 del_timer_sync(&port->multicast_router_timer);
847 free_percpu(port->mcast_stats);
850 static void br_multicast_enable(struct bridge_mcast_own_query *query)
852 query->startup_sent = 0;
854 if (try_to_del_timer_sync(&query->timer) >= 0 ||
855 del_timer(&query->timer))
856 mod_timer(&query->timer, jiffies);
859 static void __br_multicast_enable_port(struct net_bridge_port *port)
861 struct net_bridge *br = port->br;
863 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
866 br_multicast_enable(&port->ip4_own_query);
867 #if IS_ENABLED(CONFIG_IPV6)
868 br_multicast_enable(&port->ip6_own_query);
870 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
871 hlist_unhashed(&port->rlist))
872 br_multicast_add_router(br, port);
875 void br_multicast_enable_port(struct net_bridge_port *port)
877 struct net_bridge *br = port->br;
879 spin_lock(&br->multicast_lock);
880 __br_multicast_enable_port(port);
881 spin_unlock(&br->multicast_lock);
884 void br_multicast_disable_port(struct net_bridge_port *port)
886 struct net_bridge *br = port->br;
887 struct net_bridge_port_group *pg;
888 struct hlist_node *n;
890 spin_lock(&br->multicast_lock);
891 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
892 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
893 br_multicast_del_pg(br, pg);
895 __del_port_router(port);
897 del_timer(&port->multicast_router_timer);
898 del_timer(&port->ip4_own_query.timer);
899 #if IS_ENABLED(CONFIG_IPV6)
900 del_timer(&port->ip6_own_query.timer);
902 spin_unlock(&br->multicast_lock);
905 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
906 struct net_bridge_port *port,
910 const unsigned char *src;
911 struct igmpv3_report *ih;
912 struct igmpv3_grec *grec;
920 ih = igmpv3_report_hdr(skb);
921 num = ntohs(ih->ngrec);
922 len = skb_transport_offset(skb) + sizeof(*ih);
924 for (i = 0; i < num; i++) {
925 len += sizeof(*grec);
926 if (!ip_mc_may_pull(skb, len))
929 grec = (void *)(skb->data + len - sizeof(*grec));
930 group = grec->grec_mca;
931 type = grec->grec_type;
933 len += ntohs(grec->grec_nsrcs) * 4;
934 if (!ip_mc_may_pull(skb, len))
937 /* We treat this as an IGMPv2 report for now. */
939 case IGMPV3_MODE_IS_INCLUDE:
940 case IGMPV3_MODE_IS_EXCLUDE:
941 case IGMPV3_CHANGE_TO_INCLUDE:
942 case IGMPV3_CHANGE_TO_EXCLUDE:
943 case IGMPV3_ALLOW_NEW_SOURCES:
944 case IGMPV3_BLOCK_OLD_SOURCES:
951 src = eth_hdr(skb)->h_source;
952 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
953 type == IGMPV3_MODE_IS_INCLUDE) &&
954 ntohs(grec->grec_nsrcs) == 0) {
955 br_ip4_multicast_leave_group(br, port, group, vid, src);
957 err = br_ip4_multicast_add_group(br, port, group, vid,
967 #if IS_ENABLED(CONFIG_IPV6)
968 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
969 struct net_bridge_port *port,
973 unsigned int nsrcs_offset;
974 const unsigned char *src;
975 struct icmp6hdr *icmp6h;
976 struct mld2_grec *grec;
977 unsigned int grec_len;
983 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
986 icmp6h = icmp6_hdr(skb);
987 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
988 len = skb_transport_offset(skb) + sizeof(*icmp6h);
990 for (i = 0; i < num; i++) {
991 __be16 *nsrcs, _nsrcs;
993 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
995 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
996 nsrcs_offset + sizeof(_nsrcs))
999 nsrcs = skb_header_pointer(skb, nsrcs_offset,
1000 sizeof(_nsrcs), &_nsrcs);
1004 grec_len = struct_size(grec, grec_src, ntohs(*nsrcs));
1006 if (!ipv6_mc_may_pull(skb, len + grec_len))
1009 grec = (struct mld2_grec *)(skb->data + len);
1012 /* We treat these as MLDv1 reports for now. */
1013 switch (grec->grec_type) {
1014 case MLD2_MODE_IS_INCLUDE:
1015 case MLD2_MODE_IS_EXCLUDE:
1016 case MLD2_CHANGE_TO_INCLUDE:
1017 case MLD2_CHANGE_TO_EXCLUDE:
1018 case MLD2_ALLOW_NEW_SOURCES:
1019 case MLD2_BLOCK_OLD_SOURCES:
1026 src = eth_hdr(skb)->h_source;
1027 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1028 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1029 ntohs(*nsrcs) == 0) {
1030 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1033 err = br_ip6_multicast_add_group(br, port,
1034 &grec->grec_mca, vid,
1045 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1046 struct net_bridge_port *port,
1049 if (!timer_pending(&br->ip4_own_query.timer) &&
1050 !timer_pending(&br->ip4_other_query.timer))
1053 if (!br->ip4_querier.addr.u.ip4)
1056 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1062 br->ip4_querier.addr.u.ip4 = saddr;
1064 /* update protected by general multicast_lock by caller */
1065 rcu_assign_pointer(br->ip4_querier.port, port);
1070 #if IS_ENABLED(CONFIG_IPV6)
1071 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1072 struct net_bridge_port *port,
1073 struct in6_addr *saddr)
1075 if (!timer_pending(&br->ip6_own_query.timer) &&
1076 !timer_pending(&br->ip6_other_query.timer))
1079 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1085 br->ip6_querier.addr.u.ip6 = *saddr;
1087 /* update protected by general multicast_lock by caller */
1088 rcu_assign_pointer(br->ip6_querier.port, port);
1094 static bool br_multicast_select_querier(struct net_bridge *br,
1095 struct net_bridge_port *port,
1096 struct br_ip *saddr)
1098 switch (saddr->proto) {
1099 case htons(ETH_P_IP):
1100 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1101 #if IS_ENABLED(CONFIG_IPV6)
1102 case htons(ETH_P_IPV6):
1103 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1111 br_multicast_update_query_timer(struct net_bridge *br,
1112 struct bridge_mcast_other_query *query,
1113 unsigned long max_delay)
1115 if (!timer_pending(&query->timer))
1116 query->delay_time = jiffies + max_delay;
1118 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1121 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1124 struct switchdev_attr attr = {
1126 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1127 .flags = SWITCHDEV_F_DEFER,
1128 .u.mrouter = is_mc_router,
1131 switchdev_port_attr_set(p->dev, &attr);
1135 * Add port to router_list
1136 * list is maintained ordered by pointer value
1137 * and locked by br->multicast_lock and RCU
1139 static void br_multicast_add_router(struct net_bridge *br,
1140 struct net_bridge_port *port)
1142 struct net_bridge_port *p;
1143 struct hlist_node *slot = NULL;
1145 if (!hlist_unhashed(&port->rlist))
1148 hlist_for_each_entry(p, &br->router_list, rlist) {
1149 if ((unsigned long) port >= (unsigned long) p)
1155 hlist_add_behind_rcu(&port->rlist, slot);
1157 hlist_add_head_rcu(&port->rlist, &br->router_list);
1158 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1159 br_port_mc_router_state_change(port, true);
1162 static void br_multicast_mark_router(struct net_bridge *br,
1163 struct net_bridge_port *port)
1165 unsigned long now = jiffies;
1168 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1169 if (!timer_pending(&br->multicast_router_timer))
1170 br_mc_router_state_change(br, true);
1171 mod_timer(&br->multicast_router_timer,
1172 now + br->multicast_querier_interval);
1177 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1178 port->multicast_router == MDB_RTR_TYPE_PERM)
1181 br_multicast_add_router(br, port);
1183 mod_timer(&port->multicast_router_timer,
1184 now + br->multicast_querier_interval);
1187 static void br_multicast_query_received(struct net_bridge *br,
1188 struct net_bridge_port *port,
1189 struct bridge_mcast_other_query *query,
1190 struct br_ip *saddr,
1191 unsigned long max_delay)
1193 if (!br_multicast_select_querier(br, port, saddr))
1196 br_multicast_update_query_timer(br, query, max_delay);
1197 br_multicast_mark_router(br, port);
1200 static void br_ip4_multicast_query(struct net_bridge *br,
1201 struct net_bridge_port *port,
1202 struct sk_buff *skb,
1205 unsigned int transport_len = ip_transport_len(skb);
1206 const struct iphdr *iph = ip_hdr(skb);
1207 struct igmphdr *ih = igmp_hdr(skb);
1208 struct net_bridge_mdb_entry *mp;
1209 struct igmpv3_query *ih3;
1210 struct net_bridge_port_group *p;
1211 struct net_bridge_port_group __rcu **pp;
1213 unsigned long max_delay;
1214 unsigned long now = jiffies;
1217 spin_lock(&br->multicast_lock);
1218 if (!netif_running(br->dev) ||
1219 (port && port->state == BR_STATE_DISABLED))
1224 if (transport_len == sizeof(*ih)) {
1225 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1228 max_delay = 10 * HZ;
1231 } else if (transport_len >= sizeof(*ih3)) {
1232 ih3 = igmpv3_query_hdr(skb);
1236 max_delay = ih3->code ?
1237 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1243 saddr.proto = htons(ETH_P_IP);
1244 saddr.u.ip4 = iph->saddr;
1246 br_multicast_query_received(br, port, &br->ip4_other_query,
1251 mp = br_mdb_ip4_get(br, group, vid);
1255 max_delay *= br->multicast_last_member_count;
1257 if (mp->host_joined &&
1258 (timer_pending(&mp->timer) ?
1259 time_after(mp->timer.expires, now + max_delay) :
1260 try_to_del_timer_sync(&mp->timer) >= 0))
1261 mod_timer(&mp->timer, now + max_delay);
1263 for (pp = &mp->ports;
1264 (p = mlock_dereference(*pp, br)) != NULL;
1266 if (timer_pending(&p->timer) ?
1267 time_after(p->timer.expires, now + max_delay) :
1268 try_to_del_timer_sync(&p->timer) >= 0)
1269 mod_timer(&p->timer, now + max_delay);
1273 spin_unlock(&br->multicast_lock);
1276 #if IS_ENABLED(CONFIG_IPV6)
1277 static int br_ip6_multicast_query(struct net_bridge *br,
1278 struct net_bridge_port *port,
1279 struct sk_buff *skb,
1282 unsigned int transport_len = ipv6_transport_len(skb);
1283 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1284 struct mld_msg *mld;
1285 struct net_bridge_mdb_entry *mp;
1286 struct mld2_query *mld2q;
1287 struct net_bridge_port_group *p;
1288 struct net_bridge_port_group __rcu **pp;
1290 unsigned long max_delay;
1291 unsigned long now = jiffies;
1292 unsigned int offset = skb_transport_offset(skb);
1293 const struct in6_addr *group = NULL;
1294 bool is_general_query;
1297 spin_lock(&br->multicast_lock);
1298 if (!netif_running(br->dev) ||
1299 (port && port->state == BR_STATE_DISABLED))
1302 if (transport_len == sizeof(*mld)) {
1303 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1307 mld = (struct mld_msg *) icmp6_hdr(skb);
1308 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1310 group = &mld->mld_mca;
1312 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1316 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1317 if (!mld2q->mld2q_nsrcs)
1318 group = &mld2q->mld2q_mca;
1320 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1323 is_general_query = group && ipv6_addr_any(group);
1325 if (is_general_query) {
1326 saddr.proto = htons(ETH_P_IPV6);
1327 saddr.u.ip6 = ip6h->saddr;
1329 br_multicast_query_received(br, port, &br->ip6_other_query,
1332 } else if (!group) {
1336 mp = br_mdb_ip6_get(br, group, vid);
1340 max_delay *= br->multicast_last_member_count;
1341 if (mp->host_joined &&
1342 (timer_pending(&mp->timer) ?
1343 time_after(mp->timer.expires, now + max_delay) :
1344 try_to_del_timer_sync(&mp->timer) >= 0))
1345 mod_timer(&mp->timer, now + max_delay);
1347 for (pp = &mp->ports;
1348 (p = mlock_dereference(*pp, br)) != NULL;
1350 if (timer_pending(&p->timer) ?
1351 time_after(p->timer.expires, now + max_delay) :
1352 try_to_del_timer_sync(&p->timer) >= 0)
1353 mod_timer(&p->timer, now + max_delay);
1357 spin_unlock(&br->multicast_lock);
1363 br_multicast_leave_group(struct net_bridge *br,
1364 struct net_bridge_port *port,
1365 struct br_ip *group,
1366 struct bridge_mcast_other_query *other_query,
1367 struct bridge_mcast_own_query *own_query,
1368 const unsigned char *src)
1370 struct net_bridge_mdb_entry *mp;
1371 struct net_bridge_port_group *p;
1375 spin_lock(&br->multicast_lock);
1376 if (!netif_running(br->dev) ||
1377 (port && port->state == BR_STATE_DISABLED))
1380 mp = br_mdb_ip_get(br, group);
1384 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1385 struct net_bridge_port_group __rcu **pp;
1387 for (pp = &mp->ports;
1388 (p = mlock_dereference(*pp, br)) != NULL;
1390 if (!br_port_group_equal(p, port, src))
1393 rcu_assign_pointer(*pp, p->next);
1394 hlist_del_init(&p->mglist);
1395 del_timer(&p->timer);
1397 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1400 if (!mp->ports && !mp->host_joined &&
1401 netif_running(br->dev))
1402 mod_timer(&mp->timer, jiffies);
1407 if (timer_pending(&other_query->timer))
1410 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
1411 __br_multicast_send_query(br, port, &mp->addr);
1413 time = jiffies + br->multicast_last_member_count *
1414 br->multicast_last_member_interval;
1416 mod_timer(&own_query->timer, time);
1418 for (p = mlock_dereference(mp->ports, br);
1420 p = mlock_dereference(p->next, br)) {
1421 if (!br_port_group_equal(p, port, src))
1424 if (!hlist_unhashed(&p->mglist) &&
1425 (timer_pending(&p->timer) ?
1426 time_after(p->timer.expires, time) :
1427 try_to_del_timer_sync(&p->timer) >= 0)) {
1428 mod_timer(&p->timer, time);
1436 time = now + br->multicast_last_member_count *
1437 br->multicast_last_member_interval;
1440 if (mp->host_joined &&
1441 (timer_pending(&mp->timer) ?
1442 time_after(mp->timer.expires, time) :
1443 try_to_del_timer_sync(&mp->timer) >= 0)) {
1444 mod_timer(&mp->timer, time);
1450 for (p = mlock_dereference(mp->ports, br);
1452 p = mlock_dereference(p->next, br)) {
1453 if (p->port != port)
1456 if (!hlist_unhashed(&p->mglist) &&
1457 (timer_pending(&p->timer) ?
1458 time_after(p->timer.expires, time) :
1459 try_to_del_timer_sync(&p->timer) >= 0)) {
1460 mod_timer(&p->timer, time);
1466 spin_unlock(&br->multicast_lock);
1469 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1470 struct net_bridge_port *port,
1473 const unsigned char *src)
1475 struct br_ip br_group;
1476 struct bridge_mcast_own_query *own_query;
1478 if (ipv4_is_local_multicast(group))
1481 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1483 memset(&br_group, 0, sizeof(br_group));
1484 br_group.u.ip4 = group;
1485 br_group.proto = htons(ETH_P_IP);
1488 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1492 #if IS_ENABLED(CONFIG_IPV6)
1493 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1494 struct net_bridge_port *port,
1495 const struct in6_addr *group,
1497 const unsigned char *src)
1499 struct br_ip br_group;
1500 struct bridge_mcast_own_query *own_query;
1502 if (ipv6_addr_is_ll_all_nodes(group))
1505 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1507 memset(&br_group, 0, sizeof(br_group));
1508 br_group.u.ip6 = *group;
1509 br_group.proto = htons(ETH_P_IPV6);
1512 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1517 static void br_multicast_err_count(const struct net_bridge *br,
1518 const struct net_bridge_port *p,
1521 struct bridge_mcast_stats __percpu *stats;
1522 struct bridge_mcast_stats *pstats;
1524 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1528 stats = p->mcast_stats;
1530 stats = br->mcast_stats;
1531 if (WARN_ON(!stats))
1534 pstats = this_cpu_ptr(stats);
1536 u64_stats_update_begin(&pstats->syncp);
1538 case htons(ETH_P_IP):
1539 pstats->mstats.igmp_parse_errors++;
1541 #if IS_ENABLED(CONFIG_IPV6)
1542 case htons(ETH_P_IPV6):
1543 pstats->mstats.mld_parse_errors++;
1547 u64_stats_update_end(&pstats->syncp);
1550 static void br_multicast_pim(struct net_bridge *br,
1551 struct net_bridge_port *port,
1552 const struct sk_buff *skb)
1554 unsigned int offset = skb_transport_offset(skb);
1555 struct pimhdr *pimhdr, _pimhdr;
1557 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1558 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1559 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1562 br_multicast_mark_router(br, port);
1565 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1566 struct net_bridge_port *port,
1567 struct sk_buff *skb)
1569 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1570 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1573 br_multicast_mark_router(br, port);
1578 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1579 struct net_bridge_port *port,
1580 struct sk_buff *skb,
1583 const unsigned char *src;
1587 err = ip_mc_check_igmp(skb);
1589 if (err == -ENOMSG) {
1590 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1591 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1592 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1593 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1594 br_multicast_pim(br, port, skb);
1595 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
1596 br_ip4_multicast_mrd_rcv(br, port, skb);
1600 } else if (err < 0) {
1601 br_multicast_err_count(br, port, skb->protocol);
1606 src = eth_hdr(skb)->h_source;
1607 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1610 case IGMP_HOST_MEMBERSHIP_REPORT:
1611 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1612 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1613 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1615 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1616 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
1618 case IGMP_HOST_MEMBERSHIP_QUERY:
1619 br_ip4_multicast_query(br, port, skb, vid);
1621 case IGMP_HOST_LEAVE_MESSAGE:
1622 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1626 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1632 #if IS_ENABLED(CONFIG_IPV6)
1633 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1634 struct net_bridge_port *port,
1635 struct sk_buff *skb)
1639 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1642 ret = ipv6_mc_check_icmpv6(skb);
1646 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1649 br_multicast_mark_router(br, port);
1654 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1655 struct net_bridge_port *port,
1656 struct sk_buff *skb,
1659 const unsigned char *src;
1660 struct mld_msg *mld;
1663 err = ipv6_mc_check_mld(skb);
1665 if (err == -ENOMSG) {
1666 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1667 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1669 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1670 err = br_ip6_multicast_mrd_rcv(br, port, skb);
1672 if (err < 0 && err != -ENOMSG) {
1673 br_multicast_err_count(br, port, skb->protocol);
1679 } else if (err < 0) {
1680 br_multicast_err_count(br, port, skb->protocol);
1684 mld = (struct mld_msg *)skb_transport_header(skb);
1685 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1687 switch (mld->mld_type) {
1688 case ICMPV6_MGM_REPORT:
1689 src = eth_hdr(skb)->h_source;
1690 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1691 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1694 case ICMPV6_MLD2_REPORT:
1695 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
1697 case ICMPV6_MGM_QUERY:
1698 err = br_ip6_multicast_query(br, port, skb, vid);
1700 case ICMPV6_MGM_REDUCTION:
1701 src = eth_hdr(skb)->h_source;
1702 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1706 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1713 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1714 struct sk_buff *skb, u16 vid)
1718 BR_INPUT_SKB_CB(skb)->igmp = 0;
1719 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1721 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1724 switch (skb->protocol) {
1725 case htons(ETH_P_IP):
1726 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1728 #if IS_ENABLED(CONFIG_IPV6)
1729 case htons(ETH_P_IPV6):
1730 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1738 static void br_multicast_query_expired(struct net_bridge *br,
1739 struct bridge_mcast_own_query *query,
1740 struct bridge_mcast_querier *querier)
1742 spin_lock(&br->multicast_lock);
1743 if (query->startup_sent < br->multicast_startup_query_count)
1744 query->startup_sent++;
1746 RCU_INIT_POINTER(querier->port, NULL);
1747 br_multicast_send_query(br, NULL, query);
1748 spin_unlock(&br->multicast_lock);
1751 static void br_ip4_multicast_query_expired(struct timer_list *t)
1753 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1755 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1758 #if IS_ENABLED(CONFIG_IPV6)
1759 static void br_ip6_multicast_query_expired(struct timer_list *t)
1761 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1763 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1767 void br_multicast_init(struct net_bridge *br)
1769 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
1771 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1772 br->multicast_last_member_count = 2;
1773 br->multicast_startup_query_count = 2;
1775 br->multicast_last_member_interval = HZ;
1776 br->multicast_query_response_interval = 10 * HZ;
1777 br->multicast_startup_query_interval = 125 * HZ / 4;
1778 br->multicast_query_interval = 125 * HZ;
1779 br->multicast_querier_interval = 255 * HZ;
1780 br->multicast_membership_interval = 260 * HZ;
1782 br->ip4_other_query.delay_time = 0;
1783 br->ip4_querier.port = NULL;
1784 br->multicast_igmp_version = 2;
1785 #if IS_ENABLED(CONFIG_IPV6)
1786 br->multicast_mld_version = 1;
1787 br->ip6_other_query.delay_time = 0;
1788 br->ip6_querier.port = NULL;
1790 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
1791 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
1793 spin_lock_init(&br->multicast_lock);
1794 timer_setup(&br->multicast_router_timer,
1795 br_multicast_local_router_expired, 0);
1796 timer_setup(&br->ip4_other_query.timer,
1797 br_ip4_multicast_querier_expired, 0);
1798 timer_setup(&br->ip4_own_query.timer,
1799 br_ip4_multicast_query_expired, 0);
1800 #if IS_ENABLED(CONFIG_IPV6)
1801 timer_setup(&br->ip6_other_query.timer,
1802 br_ip6_multicast_querier_expired, 0);
1803 timer_setup(&br->ip6_own_query.timer,
1804 br_ip6_multicast_query_expired, 0);
1806 INIT_HLIST_HEAD(&br->mdb_list);
1809 static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1811 struct in_device *in_dev = in_dev_get(br->dev);
1816 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1820 #if IS_ENABLED(CONFIG_IPV6)
1821 static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1823 struct in6_addr addr;
1825 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1826 ipv6_dev_mc_inc(br->dev, &addr);
1829 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1834 static void br_multicast_join_snoopers(struct net_bridge *br)
1836 br_ip4_multicast_join_snoopers(br);
1837 br_ip6_multicast_join_snoopers(br);
1840 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1842 struct in_device *in_dev = in_dev_get(br->dev);
1844 if (WARN_ON(!in_dev))
1847 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1851 #if IS_ENABLED(CONFIG_IPV6)
1852 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1854 struct in6_addr addr;
1856 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1857 ipv6_dev_mc_dec(br->dev, &addr);
1860 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1865 static void br_multicast_leave_snoopers(struct net_bridge *br)
1867 br_ip4_multicast_leave_snoopers(br);
1868 br_ip6_multicast_leave_snoopers(br);
1871 static void __br_multicast_open(struct net_bridge *br,
1872 struct bridge_mcast_own_query *query)
1874 query->startup_sent = 0;
1876 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1879 mod_timer(&query->timer, jiffies);
1882 void br_multicast_open(struct net_bridge *br)
1884 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1885 br_multicast_join_snoopers(br);
1887 __br_multicast_open(br, &br->ip4_own_query);
1888 #if IS_ENABLED(CONFIG_IPV6)
1889 __br_multicast_open(br, &br->ip6_own_query);
1893 void br_multicast_stop(struct net_bridge *br)
1895 del_timer_sync(&br->multicast_router_timer);
1896 del_timer_sync(&br->ip4_other_query.timer);
1897 del_timer_sync(&br->ip4_own_query.timer);
1898 #if IS_ENABLED(CONFIG_IPV6)
1899 del_timer_sync(&br->ip6_other_query.timer);
1900 del_timer_sync(&br->ip6_own_query.timer);
1903 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1904 br_multicast_leave_snoopers(br);
1907 void br_multicast_dev_del(struct net_bridge *br)
1909 struct net_bridge_mdb_entry *mp;
1910 struct hlist_node *tmp;
1912 spin_lock_bh(&br->multicast_lock);
1913 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1914 del_timer(&mp->timer);
1915 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1917 hlist_del_rcu(&mp->mdb_node);
1920 spin_unlock_bh(&br->multicast_lock);
1925 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1929 spin_lock_bh(&br->multicast_lock);
1932 case MDB_RTR_TYPE_DISABLED:
1933 case MDB_RTR_TYPE_PERM:
1934 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
1935 del_timer(&br->multicast_router_timer);
1936 br->multicast_router = val;
1939 case MDB_RTR_TYPE_TEMP_QUERY:
1940 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1941 br_mc_router_state_change(br, false);
1942 br->multicast_router = val;
1947 spin_unlock_bh(&br->multicast_lock);
1952 static void __del_port_router(struct net_bridge_port *p)
1954 if (hlist_unhashed(&p->rlist))
1956 hlist_del_init_rcu(&p->rlist);
1957 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1958 br_port_mc_router_state_change(p, false);
1960 /* don't allow timer refresh */
1961 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1962 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1965 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1967 struct net_bridge *br = p->br;
1968 unsigned long now = jiffies;
1971 spin_lock(&br->multicast_lock);
1972 if (p->multicast_router == val) {
1973 /* Refresh the temp router port timer */
1974 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1975 mod_timer(&p->multicast_router_timer,
1976 now + br->multicast_querier_interval);
1981 case MDB_RTR_TYPE_DISABLED:
1982 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1983 __del_port_router(p);
1984 del_timer(&p->multicast_router_timer);
1986 case MDB_RTR_TYPE_TEMP_QUERY:
1987 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1988 __del_port_router(p);
1990 case MDB_RTR_TYPE_PERM:
1991 p->multicast_router = MDB_RTR_TYPE_PERM;
1992 del_timer(&p->multicast_router_timer);
1993 br_multicast_add_router(br, p);
1995 case MDB_RTR_TYPE_TEMP:
1996 p->multicast_router = MDB_RTR_TYPE_TEMP;
1997 br_multicast_mark_router(br, p);
2004 spin_unlock(&br->multicast_lock);
2009 static void br_multicast_start_querier(struct net_bridge *br,
2010 struct bridge_mcast_own_query *query)
2012 struct net_bridge_port *port;
2014 __br_multicast_open(br, query);
2017 list_for_each_entry_rcu(port, &br->port_list, list) {
2018 if (port->state == BR_STATE_DISABLED ||
2019 port->state == BR_STATE_BLOCKING)
2022 if (query == &br->ip4_own_query)
2023 br_multicast_enable(&port->ip4_own_query);
2024 #if IS_ENABLED(CONFIG_IPV6)
2026 br_multicast_enable(&port->ip6_own_query);
2032 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2034 struct net_bridge_port *port;
2036 spin_lock_bh(&br->multicast_lock);
2037 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
2040 br_mc_disabled_update(br->dev, val);
2041 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2042 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2043 br_multicast_leave_snoopers(br);
2047 if (!netif_running(br->dev))
2050 br_multicast_open(br);
2051 list_for_each_entry(port, &br->port_list, list)
2052 __br_multicast_enable_port(port);
2055 spin_unlock_bh(&br->multicast_lock);
2060 bool br_multicast_enabled(const struct net_device *dev)
2062 struct net_bridge *br = netdev_priv(dev);
2064 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
2066 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2068 bool br_multicast_router(const struct net_device *dev)
2070 struct net_bridge *br = netdev_priv(dev);
2073 spin_lock_bh(&br->multicast_lock);
2074 is_router = br_multicast_is_router(br);
2075 spin_unlock_bh(&br->multicast_lock);
2078 EXPORT_SYMBOL_GPL(br_multicast_router);
2080 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2082 unsigned long max_delay;
2086 spin_lock_bh(&br->multicast_lock);
2087 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
2090 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
2094 max_delay = br->multicast_query_response_interval;
2096 if (!timer_pending(&br->ip4_other_query.timer))
2097 br->ip4_other_query.delay_time = jiffies + max_delay;
2099 br_multicast_start_querier(br, &br->ip4_own_query);
2101 #if IS_ENABLED(CONFIG_IPV6)
2102 if (!timer_pending(&br->ip6_other_query.timer))
2103 br->ip6_other_query.delay_time = jiffies + max_delay;
2105 br_multicast_start_querier(br, &br->ip6_own_query);
2109 spin_unlock_bh(&br->multicast_lock);
2114 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2116 /* Currently we support only version 2 and 3 */
2125 spin_lock_bh(&br->multicast_lock);
2126 br->multicast_igmp_version = val;
2127 spin_unlock_bh(&br->multicast_lock);
2132 #if IS_ENABLED(CONFIG_IPV6)
2133 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2135 /* Currently we support version 1 and 2 */
2144 spin_lock_bh(&br->multicast_lock);
2145 br->multicast_mld_version = val;
2146 spin_unlock_bh(&br->multicast_lock);
2153 * br_multicast_list_adjacent - Returns snooped multicast addresses
2154 * @dev: The bridge port adjacent to which to retrieve addresses
2155 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2157 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2158 * snooping feature on all bridge ports of dev's bridge device, excluding
2159 * the addresses from dev itself.
2161 * Returns the number of items added to br_ip_list.
2164 * - br_ip_list needs to be initialized by caller
2165 * - br_ip_list might contain duplicates in the end
2166 * (needs to be taken care of by caller)
2167 * - br_ip_list needs to be freed by caller
2169 int br_multicast_list_adjacent(struct net_device *dev,
2170 struct list_head *br_ip_list)
2172 struct net_bridge *br;
2173 struct net_bridge_port *port;
2174 struct net_bridge_port_group *group;
2175 struct br_ip_list *entry;
2179 if (!br_ip_list || !netif_is_bridge_port(dev))
2182 port = br_port_get_rcu(dev);
2183 if (!port || !port->br)
2188 list_for_each_entry_rcu(port, &br->port_list, list) {
2189 if (!port->dev || port->dev == dev)
2192 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2193 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2197 entry->addr = group->addr;
2198 list_add(&entry->list, br_ip_list);
2207 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2210 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2211 * @dev: The bridge port providing the bridge on which to check for a querier
2212 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2214 * Checks whether the given interface has a bridge on top and if so returns
2215 * true if a valid querier exists anywhere on the bridged link layer.
2216 * Otherwise returns false.
2218 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2220 struct net_bridge *br;
2221 struct net_bridge_port *port;
2226 if (!netif_is_bridge_port(dev))
2229 port = br_port_get_rcu(dev);
2230 if (!port || !port->br)
2235 memset(ð, 0, sizeof(eth));
2236 eth.h_proto = htons(proto);
2238 ret = br_multicast_querier_exists(br, ð);
2244 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2247 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2248 * @dev: The bridge port adjacent to which to check for a querier
2249 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2251 * Checks whether the given interface has a bridge on top and if so returns
2252 * true if a selected querier is behind one of the other ports of this
2253 * bridge. Otherwise returns false.
2255 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2257 struct net_bridge *br;
2258 struct net_bridge_port *port;
2262 if (!netif_is_bridge_port(dev))
2265 port = br_port_get_rcu(dev);
2266 if (!port || !port->br)
2273 if (!timer_pending(&br->ip4_other_query.timer) ||
2274 rcu_dereference(br->ip4_querier.port) == port)
2277 #if IS_ENABLED(CONFIG_IPV6)
2279 if (!timer_pending(&br->ip6_other_query.timer) ||
2280 rcu_dereference(br->ip6_querier.port) == port)
2293 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2295 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2296 const struct sk_buff *skb, u8 type, u8 dir)
2298 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2299 __be16 proto = skb->protocol;
2302 u64_stats_update_begin(&pstats->syncp);
2304 case htons(ETH_P_IP):
2305 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2307 case IGMP_HOST_MEMBERSHIP_REPORT:
2308 pstats->mstats.igmp_v1reports[dir]++;
2310 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2311 pstats->mstats.igmp_v2reports[dir]++;
2313 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2314 pstats->mstats.igmp_v3reports[dir]++;
2316 case IGMP_HOST_MEMBERSHIP_QUERY:
2317 if (t_len != sizeof(struct igmphdr)) {
2318 pstats->mstats.igmp_v3queries[dir]++;
2320 unsigned int offset = skb_transport_offset(skb);
2321 struct igmphdr *ih, _ihdr;
2323 ih = skb_header_pointer(skb, offset,
2324 sizeof(_ihdr), &_ihdr);
2328 pstats->mstats.igmp_v1queries[dir]++;
2330 pstats->mstats.igmp_v2queries[dir]++;
2333 case IGMP_HOST_LEAVE_MESSAGE:
2334 pstats->mstats.igmp_leaves[dir]++;
2338 #if IS_ENABLED(CONFIG_IPV6)
2339 case htons(ETH_P_IPV6):
2340 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2341 sizeof(struct ipv6hdr);
2342 t_len -= skb_network_header_len(skb);
2344 case ICMPV6_MGM_REPORT:
2345 pstats->mstats.mld_v1reports[dir]++;
2347 case ICMPV6_MLD2_REPORT:
2348 pstats->mstats.mld_v2reports[dir]++;
2350 case ICMPV6_MGM_QUERY:
2351 if (t_len != sizeof(struct mld_msg))
2352 pstats->mstats.mld_v2queries[dir]++;
2354 pstats->mstats.mld_v1queries[dir]++;
2356 case ICMPV6_MGM_REDUCTION:
2357 pstats->mstats.mld_leaves[dir]++;
2361 #endif /* CONFIG_IPV6 */
2363 u64_stats_update_end(&pstats->syncp);
2366 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2367 const struct sk_buff *skb, u8 type, u8 dir)
2369 struct bridge_mcast_stats __percpu *stats;
2371 /* if multicast_disabled is true then igmp type can't be set */
2372 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2376 stats = p->mcast_stats;
2378 stats = br->mcast_stats;
2379 if (WARN_ON(!stats))
2382 br_mcast_stats_add(stats, skb, type, dir);
2385 int br_multicast_init_stats(struct net_bridge *br)
2387 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2388 if (!br->mcast_stats)
2394 void br_multicast_uninit_stats(struct net_bridge *br)
2396 free_percpu(br->mcast_stats);
2399 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2401 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2402 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2405 void br_multicast_get_stats(const struct net_bridge *br,
2406 const struct net_bridge_port *p,
2407 struct br_mcast_stats *dest)
2409 struct bridge_mcast_stats __percpu *stats;
2410 struct br_mcast_stats tdst;
2413 memset(dest, 0, sizeof(*dest));
2415 stats = p->mcast_stats;
2417 stats = br->mcast_stats;
2418 if (WARN_ON(!stats))
2421 memset(&tdst, 0, sizeof(tdst));
2422 for_each_possible_cpu(i) {
2423 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2424 struct br_mcast_stats temp;
2428 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2429 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2430 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2432 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2433 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2434 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2435 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2436 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2437 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2438 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2439 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2441 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2442 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2443 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2444 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2445 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2446 tdst.mld_parse_errors += temp.mld_parse_errors;
2448 memcpy(dest, &tdst, sizeof(*dest));
2451 int br_mdb_hash_init(struct net_bridge *br)
2453 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2456 void br_mdb_hash_fini(struct net_bridge *br)
2458 rhashtable_destroy(&br->mdb_hash_tbl);