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,
50 static void br_multicast_start_querier(struct net_bridge *br,
51 struct bridge_mcast_own_query *query);
52 static void br_multicast_add_router(struct net_bridge *br,
53 struct net_bridge_port *port);
54 static void br_ip4_multicast_leave_group(struct net_bridge *br,
55 struct net_bridge_port *port,
58 const unsigned char *src);
60 static void __del_port_router(struct net_bridge_port *p);
61 #if IS_ENABLED(CONFIG_IPV6)
62 static void br_ip6_multicast_leave_group(struct net_bridge *br,
63 struct net_bridge_port *port,
64 const struct in6_addr *group,
65 __u16 vid, const unsigned char *src);
68 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
70 if (a->proto != b->proto)
76 return a->u.ip4 == b->u.ip4;
77 #if IS_ENABLED(CONFIG_IPV6)
78 case htons(ETH_P_IPV6):
79 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
85 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
88 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
91 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
94 struct net_bridge_mdb_entry *ent;
96 lockdep_assert_held_once(&br->multicast_lock);
99 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
105 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
106 __be32 dst, __u16 vid)
110 memset(&br_dst, 0, sizeof(br_dst));
112 br_dst.proto = htons(ETH_P_IP);
115 return br_mdb_ip_get(br, &br_dst);
118 #if IS_ENABLED(CONFIG_IPV6)
119 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
120 const struct in6_addr *dst,
125 memset(&br_dst, 0, sizeof(br_dst));
127 br_dst.proto = htons(ETH_P_IPV6);
130 return br_mdb_ip_get(br, &br_dst);
134 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
135 struct sk_buff *skb, u16 vid)
139 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
142 if (BR_INPUT_SKB_CB(skb)->igmp)
145 memset(&ip, 0, sizeof(ip));
146 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_rcu(br, &ip);
165 static void br_multicast_group_expired(struct timer_list *t)
167 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
168 struct net_bridge *br = mp->br;
170 spin_lock(&br->multicast_lock);
171 if (!netif_running(br->dev) || timer_pending(&mp->timer))
174 mp->host_joined = false;
175 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
180 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
182 hlist_del_rcu(&mp->mdb_node);
187 spin_unlock(&br->multicast_lock);
190 static void br_multicast_del_pg(struct net_bridge *br,
191 struct net_bridge_port_group *pg)
193 struct net_bridge_mdb_entry *mp;
194 struct net_bridge_port_group *p;
195 struct net_bridge_port_group __rcu **pp;
197 mp = br_mdb_ip_get(br, &pg->addr);
201 for (pp = &mp->ports;
202 (p = mlock_dereference(*pp, br)) != NULL;
207 rcu_assign_pointer(*pp, p->next);
208 hlist_del_init(&p->mglist);
209 del_timer(&p->timer);
210 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
214 if (!mp->ports && !mp->host_joined &&
215 netif_running(br->dev))
216 mod_timer(&mp->timer, jiffies);
224 static void br_multicast_port_group_expired(struct timer_list *t)
226 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
227 struct net_bridge *br = pg->port->br;
229 spin_lock(&br->multicast_lock);
230 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
231 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
234 br_multicast_del_pg(br, pg);
237 spin_unlock(&br->multicast_lock);
240 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
244 struct igmpv3_query *ihv3;
245 size_t igmp_hdr_size;
251 igmp_hdr_size = sizeof(*ih);
252 if (br->multicast_igmp_version == 3)
253 igmp_hdr_size = sizeof(*ihv3);
254 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
259 skb->protocol = htons(ETH_P_IP);
261 skb_reset_mac_header(skb);
264 ether_addr_copy(eth->h_source, br->dev->dev_addr);
267 eth->h_dest[2] = 0x5e;
271 eth->h_proto = htons(ETH_P_IP);
272 skb_put(skb, sizeof(*eth));
274 skb_set_network_header(skb, skb->len);
280 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
282 iph->frag_off = htons(IP_DF);
284 iph->protocol = IPPROTO_IGMP;
285 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
286 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
287 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
288 ((u8 *)&iph[1])[0] = IPOPT_RA;
289 ((u8 *)&iph[1])[1] = 4;
290 ((u8 *)&iph[1])[2] = 0;
291 ((u8 *)&iph[1])[3] = 0;
295 skb_set_transport_header(skb, skb->len);
296 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
298 switch (br->multicast_igmp_version) {
301 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
302 ih->code = (group ? br->multicast_last_member_interval :
303 br->multicast_query_response_interval) /
304 (HZ / IGMP_TIMER_SCALE);
307 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
310 ihv3 = igmpv3_query_hdr(skb);
311 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
312 ihv3->code = (group ? br->multicast_last_member_interval :
313 br->multicast_query_response_interval) /
314 (HZ / IGMP_TIMER_SCALE);
316 ihv3->qqic = br->multicast_query_interval / HZ;
322 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
326 skb_put(skb, igmp_hdr_size);
327 __skb_pull(skb, sizeof(*eth));
333 #if IS_ENABLED(CONFIG_IPV6)
334 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
335 const struct in6_addr *grp,
338 struct mld2_query *mld2q;
339 unsigned long interval;
340 struct ipv6hdr *ip6h;
341 struct mld_msg *mldq;
347 mld_hdr_size = sizeof(*mldq);
348 if (br->multicast_mld_version == 2)
349 mld_hdr_size = sizeof(*mld2q);
350 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
355 skb->protocol = htons(ETH_P_IPV6);
357 /* Ethernet header */
358 skb_reset_mac_header(skb);
361 ether_addr_copy(eth->h_source, br->dev->dev_addr);
362 eth->h_proto = htons(ETH_P_IPV6);
363 skb_put(skb, sizeof(*eth));
365 /* IPv6 header + HbH option */
366 skb_set_network_header(skb, skb->len);
367 ip6h = ipv6_hdr(skb);
369 *(__force __be32 *)ip6h = htonl(0x60000000);
370 ip6h->payload_len = htons(8 + mld_hdr_size);
371 ip6h->nexthdr = IPPROTO_HOPOPTS;
373 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
374 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
377 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
381 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
382 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
384 hopopt = (u8 *)(ip6h + 1);
385 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
386 hopopt[1] = 0; /* length of HbH */
387 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
388 hopopt[3] = 2; /* Length of RA Option */
389 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
391 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
392 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
394 skb_put(skb, sizeof(*ip6h) + 8);
397 skb_set_transport_header(skb, skb->len);
398 interval = ipv6_addr_any(grp) ?
399 br->multicast_query_response_interval :
400 br->multicast_last_member_interval;
401 *igmp_type = ICMPV6_MGM_QUERY;
402 switch (br->multicast_mld_version) {
404 mldq = (struct mld_msg *)icmp6_hdr(skb);
405 mldq->mld_type = ICMPV6_MGM_QUERY;
408 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
409 mldq->mld_reserved = 0;
410 mldq->mld_mca = *grp;
411 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
412 sizeof(*mldq), IPPROTO_ICMPV6,
418 mld2q = (struct mld2_query *)icmp6_hdr(skb);
419 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
420 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
421 mld2q->mld2q_code = 0;
422 mld2q->mld2q_cksum = 0;
423 mld2q->mld2q_resv1 = 0;
424 mld2q->mld2q_resv2 = 0;
425 mld2q->mld2q_suppress = 0;
426 mld2q->mld2q_qrv = 2;
427 mld2q->mld2q_nsrcs = 0;
428 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
429 mld2q->mld2q_mca = *grp;
430 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
438 skb_put(skb, mld_hdr_size);
440 __skb_pull(skb, sizeof(*eth));
447 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
451 switch (addr->proto) {
452 case htons(ETH_P_IP):
453 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
454 #if IS_ENABLED(CONFIG_IPV6)
455 case htons(ETH_P_IPV6):
456 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
463 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
466 struct net_bridge_mdb_entry *mp;
469 mp = br_mdb_ip_get(br, group);
473 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
474 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
475 return ERR_PTR(-E2BIG);
478 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
480 return ERR_PTR(-ENOMEM);
484 timer_setup(&mp->timer, br_multicast_group_expired, 0);
485 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
491 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
497 struct net_bridge_port_group *br_multicast_new_port_group(
498 struct net_bridge_port *port,
500 struct net_bridge_port_group __rcu *next,
502 const unsigned char *src)
504 struct net_bridge_port_group *p;
506 p = kzalloc(sizeof(*p), GFP_ATOMIC);
513 rcu_assign_pointer(p->next, next);
514 hlist_add_head(&p->mglist, &port->mglist);
515 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
518 memcpy(p->eth_addr, src, ETH_ALEN);
520 memset(p->eth_addr, 0xff, ETH_ALEN);
525 static bool br_port_group_equal(struct net_bridge_port_group *p,
526 struct net_bridge_port *port,
527 const unsigned char *src)
532 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
535 return ether_addr_equal(src, p->eth_addr);
538 static int br_multicast_add_group(struct net_bridge *br,
539 struct net_bridge_port *port,
541 const unsigned char *src)
543 struct net_bridge_port_group __rcu **pp;
544 struct net_bridge_port_group *p;
545 struct net_bridge_mdb_entry *mp;
546 unsigned long now = jiffies;
549 spin_lock(&br->multicast_lock);
550 if (!netif_running(br->dev) ||
551 (port && port->state == BR_STATE_DISABLED))
554 mp = br_multicast_new_group(br, group);
560 if (!mp->host_joined) {
561 mp->host_joined = true;
562 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
564 mod_timer(&mp->timer, now + br->multicast_membership_interval);
568 for (pp = &mp->ports;
569 (p = mlock_dereference(*pp, br)) != NULL;
571 if (br_port_group_equal(p, port, src))
573 if ((unsigned long)p->port < (unsigned long)port)
577 p = br_multicast_new_port_group(port, group, *pp, 0, src);
580 rcu_assign_pointer(*pp, p);
581 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
584 mod_timer(&p->timer, now + br->multicast_membership_interval);
589 spin_unlock(&br->multicast_lock);
593 static int br_ip4_multicast_add_group(struct net_bridge *br,
594 struct net_bridge_port *port,
597 const unsigned char *src)
599 struct br_ip br_group;
601 if (ipv4_is_local_multicast(group))
604 memset(&br_group, 0, sizeof(br_group));
605 br_group.u.ip4 = group;
606 br_group.proto = htons(ETH_P_IP);
609 return br_multicast_add_group(br, port, &br_group, src);
612 #if IS_ENABLED(CONFIG_IPV6)
613 static int br_ip6_multicast_add_group(struct net_bridge *br,
614 struct net_bridge_port *port,
615 const struct in6_addr *group,
617 const unsigned char *src)
619 struct br_ip br_group;
621 if (ipv6_addr_is_ll_all_nodes(group))
624 memset(&br_group, 0, sizeof(br_group));
625 br_group.u.ip6 = *group;
626 br_group.proto = htons(ETH_P_IPV6);
629 return br_multicast_add_group(br, port, &br_group, src);
633 static void br_multicast_router_expired(struct timer_list *t)
635 struct net_bridge_port *port =
636 from_timer(port, t, multicast_router_timer);
637 struct net_bridge *br = port->br;
639 spin_lock(&br->multicast_lock);
640 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
641 port->multicast_router == MDB_RTR_TYPE_PERM ||
642 timer_pending(&port->multicast_router_timer))
645 __del_port_router(port);
647 spin_unlock(&br->multicast_lock);
650 static void br_mc_router_state_change(struct net_bridge *p,
653 struct switchdev_attr attr = {
655 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
656 .flags = SWITCHDEV_F_DEFER,
657 .u.mrouter = is_mc_router,
660 switchdev_port_attr_set(p->dev, &attr);
663 static void br_multicast_local_router_expired(struct timer_list *t)
665 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
667 spin_lock(&br->multicast_lock);
668 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
669 br->multicast_router == MDB_RTR_TYPE_PERM ||
670 timer_pending(&br->multicast_router_timer))
673 br_mc_router_state_change(br, false);
675 spin_unlock(&br->multicast_lock);
678 static void br_multicast_querier_expired(struct net_bridge *br,
679 struct bridge_mcast_own_query *query)
681 spin_lock(&br->multicast_lock);
682 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
685 br_multicast_start_querier(br, query);
688 spin_unlock(&br->multicast_lock);
691 static void br_ip4_multicast_querier_expired(struct timer_list *t)
693 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
695 br_multicast_querier_expired(br, &br->ip4_own_query);
698 #if IS_ENABLED(CONFIG_IPV6)
699 static void br_ip6_multicast_querier_expired(struct timer_list *t)
701 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
703 br_multicast_querier_expired(br, &br->ip6_own_query);
707 static void br_multicast_select_own_querier(struct net_bridge *br,
711 if (ip->proto == htons(ETH_P_IP))
712 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
713 #if IS_ENABLED(CONFIG_IPV6)
715 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
719 static void __br_multicast_send_query(struct net_bridge *br,
720 struct net_bridge_port *port,
726 skb = br_multicast_alloc_query(br, ip, &igmp_type);
731 skb->dev = port->dev;
732 br_multicast_count(br, port, skb, igmp_type,
734 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
735 dev_net(port->dev), NULL, skb, NULL, skb->dev,
736 br_dev_queue_push_xmit);
738 br_multicast_select_own_querier(br, ip, skb);
739 br_multicast_count(br, port, skb, igmp_type,
745 static void br_multicast_send_query(struct net_bridge *br,
746 struct net_bridge_port *port,
747 struct bridge_mcast_own_query *own_query)
749 struct bridge_mcast_other_query *other_query = NULL;
750 struct br_ip br_group;
753 if (!netif_running(br->dev) ||
754 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
755 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
758 memset(&br_group.u, 0, sizeof(br_group.u));
760 if (port ? (own_query == &port->ip4_own_query) :
761 (own_query == &br->ip4_own_query)) {
762 other_query = &br->ip4_other_query;
763 br_group.proto = htons(ETH_P_IP);
764 #if IS_ENABLED(CONFIG_IPV6)
766 other_query = &br->ip6_other_query;
767 br_group.proto = htons(ETH_P_IPV6);
771 if (!other_query || timer_pending(&other_query->timer))
774 __br_multicast_send_query(br, port, &br_group);
777 time += own_query->startup_sent < br->multicast_startup_query_count ?
778 br->multicast_startup_query_interval :
779 br->multicast_query_interval;
780 mod_timer(&own_query->timer, time);
784 br_multicast_port_query_expired(struct net_bridge_port *port,
785 struct bridge_mcast_own_query *query)
787 struct net_bridge *br = port->br;
789 spin_lock(&br->multicast_lock);
790 if (port->state == BR_STATE_DISABLED ||
791 port->state == BR_STATE_BLOCKING)
794 if (query->startup_sent < br->multicast_startup_query_count)
795 query->startup_sent++;
797 br_multicast_send_query(port->br, port, query);
800 spin_unlock(&br->multicast_lock);
803 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
805 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
807 br_multicast_port_query_expired(port, &port->ip4_own_query);
810 #if IS_ENABLED(CONFIG_IPV6)
811 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
813 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
815 br_multicast_port_query_expired(port, &port->ip6_own_query);
819 static void br_mc_disabled_update(struct net_device *dev, bool value)
821 struct switchdev_attr attr = {
823 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
824 .flags = SWITCHDEV_F_DEFER,
825 .u.mc_disabled = !value,
828 switchdev_port_attr_set(dev, &attr);
831 int br_multicast_add_port(struct net_bridge_port *port)
833 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
835 timer_setup(&port->multicast_router_timer,
836 br_multicast_router_expired, 0);
837 timer_setup(&port->ip4_own_query.timer,
838 br_ip4_multicast_port_query_expired, 0);
839 #if IS_ENABLED(CONFIG_IPV6)
840 timer_setup(&port->ip6_own_query.timer,
841 br_ip6_multicast_port_query_expired, 0);
843 br_mc_disabled_update(port->dev,
844 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
846 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
847 if (!port->mcast_stats)
853 void br_multicast_del_port(struct net_bridge_port *port)
855 struct net_bridge *br = port->br;
856 struct net_bridge_port_group *pg;
857 struct hlist_node *n;
859 /* Take care of the remaining groups, only perm ones should be left */
860 spin_lock_bh(&br->multicast_lock);
861 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
862 br_multicast_del_pg(br, pg);
863 spin_unlock_bh(&br->multicast_lock);
864 del_timer_sync(&port->multicast_router_timer);
865 free_percpu(port->mcast_stats);
868 static void br_multicast_enable(struct bridge_mcast_own_query *query)
870 query->startup_sent = 0;
872 if (try_to_del_timer_sync(&query->timer) >= 0 ||
873 del_timer(&query->timer))
874 mod_timer(&query->timer, jiffies);
877 static void __br_multicast_enable_port(struct net_bridge_port *port)
879 struct net_bridge *br = port->br;
881 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
884 br_multicast_enable(&port->ip4_own_query);
885 #if IS_ENABLED(CONFIG_IPV6)
886 br_multicast_enable(&port->ip6_own_query);
888 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
889 hlist_unhashed(&port->rlist))
890 br_multicast_add_router(br, port);
893 void br_multicast_enable_port(struct net_bridge_port *port)
895 struct net_bridge *br = port->br;
897 spin_lock(&br->multicast_lock);
898 __br_multicast_enable_port(port);
899 spin_unlock(&br->multicast_lock);
902 void br_multicast_disable_port(struct net_bridge_port *port)
904 struct net_bridge *br = port->br;
905 struct net_bridge_port_group *pg;
906 struct hlist_node *n;
908 spin_lock(&br->multicast_lock);
909 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
910 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
911 br_multicast_del_pg(br, pg);
913 __del_port_router(port);
915 del_timer(&port->multicast_router_timer);
916 del_timer(&port->ip4_own_query.timer);
917 #if IS_ENABLED(CONFIG_IPV6)
918 del_timer(&port->ip6_own_query.timer);
920 spin_unlock(&br->multicast_lock);
923 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
924 struct net_bridge_port *port,
928 const unsigned char *src;
929 struct igmpv3_report *ih;
930 struct igmpv3_grec *grec;
938 ih = igmpv3_report_hdr(skb);
939 num = ntohs(ih->ngrec);
940 len = skb_transport_offset(skb) + sizeof(*ih);
942 for (i = 0; i < num; i++) {
943 len += sizeof(*grec);
944 if (!ip_mc_may_pull(skb, len))
947 grec = (void *)(skb->data + len - sizeof(*grec));
948 group = grec->grec_mca;
949 type = grec->grec_type;
951 len += ntohs(grec->grec_nsrcs) * 4;
952 if (!ip_mc_may_pull(skb, len))
955 /* We treat this as an IGMPv2 report for now. */
957 case IGMPV3_MODE_IS_INCLUDE:
958 case IGMPV3_MODE_IS_EXCLUDE:
959 case IGMPV3_CHANGE_TO_INCLUDE:
960 case IGMPV3_CHANGE_TO_EXCLUDE:
961 case IGMPV3_ALLOW_NEW_SOURCES:
962 case IGMPV3_BLOCK_OLD_SOURCES:
969 src = eth_hdr(skb)->h_source;
970 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
971 type == IGMPV3_MODE_IS_INCLUDE) &&
972 ntohs(grec->grec_nsrcs) == 0) {
973 br_ip4_multicast_leave_group(br, port, group, vid, src);
975 err = br_ip4_multicast_add_group(br, port, group, vid,
985 #if IS_ENABLED(CONFIG_IPV6)
986 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
987 struct net_bridge_port *port,
991 unsigned int nsrcs_offset;
992 const unsigned char *src;
993 struct icmp6hdr *icmp6h;
994 struct mld2_grec *grec;
995 unsigned int grec_len;
1001 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
1004 icmp6h = icmp6_hdr(skb);
1005 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1006 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1008 for (i = 0; i < num; i++) {
1009 __be16 *nsrcs, _nsrcs;
1011 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
1013 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
1014 nsrcs_offset + sizeof(_nsrcs))
1017 nsrcs = skb_header_pointer(skb, nsrcs_offset,
1018 sizeof(_nsrcs), &_nsrcs);
1022 grec_len = struct_size(grec, grec_src, ntohs(*nsrcs));
1024 if (!ipv6_mc_may_pull(skb, len + grec_len))
1027 grec = (struct mld2_grec *)(skb->data + len);
1030 /* We treat these as MLDv1 reports for now. */
1031 switch (grec->grec_type) {
1032 case MLD2_MODE_IS_INCLUDE:
1033 case MLD2_MODE_IS_EXCLUDE:
1034 case MLD2_CHANGE_TO_INCLUDE:
1035 case MLD2_CHANGE_TO_EXCLUDE:
1036 case MLD2_ALLOW_NEW_SOURCES:
1037 case MLD2_BLOCK_OLD_SOURCES:
1044 src = eth_hdr(skb)->h_source;
1045 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1046 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1047 ntohs(*nsrcs) == 0) {
1048 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1051 err = br_ip6_multicast_add_group(br, port,
1052 &grec->grec_mca, vid,
1063 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1064 struct net_bridge_port *port,
1067 if (!timer_pending(&br->ip4_own_query.timer) &&
1068 !timer_pending(&br->ip4_other_query.timer))
1071 if (!br->ip4_querier.addr.u.ip4)
1074 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1080 br->ip4_querier.addr.u.ip4 = saddr;
1082 /* update protected by general multicast_lock by caller */
1083 rcu_assign_pointer(br->ip4_querier.port, port);
1088 #if IS_ENABLED(CONFIG_IPV6)
1089 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1090 struct net_bridge_port *port,
1091 struct in6_addr *saddr)
1093 if (!timer_pending(&br->ip6_own_query.timer) &&
1094 !timer_pending(&br->ip6_other_query.timer))
1097 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1103 br->ip6_querier.addr.u.ip6 = *saddr;
1105 /* update protected by general multicast_lock by caller */
1106 rcu_assign_pointer(br->ip6_querier.port, port);
1112 static bool br_multicast_select_querier(struct net_bridge *br,
1113 struct net_bridge_port *port,
1114 struct br_ip *saddr)
1116 switch (saddr->proto) {
1117 case htons(ETH_P_IP):
1118 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1119 #if IS_ENABLED(CONFIG_IPV6)
1120 case htons(ETH_P_IPV6):
1121 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1129 br_multicast_update_query_timer(struct net_bridge *br,
1130 struct bridge_mcast_other_query *query,
1131 unsigned long max_delay)
1133 if (!timer_pending(&query->timer))
1134 query->delay_time = jiffies + max_delay;
1136 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1139 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1142 struct switchdev_attr attr = {
1144 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1145 .flags = SWITCHDEV_F_DEFER,
1146 .u.mrouter = is_mc_router,
1149 switchdev_port_attr_set(p->dev, &attr);
1153 * Add port to router_list
1154 * list is maintained ordered by pointer value
1155 * and locked by br->multicast_lock and RCU
1157 static void br_multicast_add_router(struct net_bridge *br,
1158 struct net_bridge_port *port)
1160 struct net_bridge_port *p;
1161 struct hlist_node *slot = NULL;
1163 if (!hlist_unhashed(&port->rlist))
1166 hlist_for_each_entry(p, &br->router_list, rlist) {
1167 if ((unsigned long) port >= (unsigned long) p)
1173 hlist_add_behind_rcu(&port->rlist, slot);
1175 hlist_add_head_rcu(&port->rlist, &br->router_list);
1176 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1177 br_port_mc_router_state_change(port, true);
1180 static void br_multicast_mark_router(struct net_bridge *br,
1181 struct net_bridge_port *port)
1183 unsigned long now = jiffies;
1186 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1187 if (!timer_pending(&br->multicast_router_timer))
1188 br_mc_router_state_change(br, true);
1189 mod_timer(&br->multicast_router_timer,
1190 now + br->multicast_querier_interval);
1195 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1196 port->multicast_router == MDB_RTR_TYPE_PERM)
1199 br_multicast_add_router(br, port);
1201 mod_timer(&port->multicast_router_timer,
1202 now + br->multicast_querier_interval);
1205 static void br_multicast_query_received(struct net_bridge *br,
1206 struct net_bridge_port *port,
1207 struct bridge_mcast_other_query *query,
1208 struct br_ip *saddr,
1209 unsigned long max_delay)
1211 if (!br_multicast_select_querier(br, port, saddr))
1214 br_multicast_update_query_timer(br, query, max_delay);
1215 br_multicast_mark_router(br, port);
1218 static void br_ip4_multicast_query(struct net_bridge *br,
1219 struct net_bridge_port *port,
1220 struct sk_buff *skb,
1223 unsigned int transport_len = ip_transport_len(skb);
1224 const struct iphdr *iph = ip_hdr(skb);
1225 struct igmphdr *ih = igmp_hdr(skb);
1226 struct net_bridge_mdb_entry *mp;
1227 struct igmpv3_query *ih3;
1228 struct net_bridge_port_group *p;
1229 struct net_bridge_port_group __rcu **pp;
1231 unsigned long max_delay;
1232 unsigned long now = jiffies;
1235 spin_lock(&br->multicast_lock);
1236 if (!netif_running(br->dev) ||
1237 (port && port->state == BR_STATE_DISABLED))
1242 if (transport_len == sizeof(*ih)) {
1243 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1246 max_delay = 10 * HZ;
1249 } else if (transport_len >= sizeof(*ih3)) {
1250 ih3 = igmpv3_query_hdr(skb);
1254 max_delay = ih3->code ?
1255 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1261 saddr.proto = htons(ETH_P_IP);
1262 saddr.u.ip4 = iph->saddr;
1264 br_multicast_query_received(br, port, &br->ip4_other_query,
1269 mp = br_mdb_ip4_get(br, group, vid);
1273 max_delay *= br->multicast_last_member_count;
1275 if (mp->host_joined &&
1276 (timer_pending(&mp->timer) ?
1277 time_after(mp->timer.expires, now + max_delay) :
1278 try_to_del_timer_sync(&mp->timer) >= 0))
1279 mod_timer(&mp->timer, now + max_delay);
1281 for (pp = &mp->ports;
1282 (p = mlock_dereference(*pp, br)) != NULL;
1284 if (timer_pending(&p->timer) ?
1285 time_after(p->timer.expires, now + max_delay) :
1286 try_to_del_timer_sync(&p->timer) >= 0)
1287 mod_timer(&p->timer, now + max_delay);
1291 spin_unlock(&br->multicast_lock);
1294 #if IS_ENABLED(CONFIG_IPV6)
1295 static int br_ip6_multicast_query(struct net_bridge *br,
1296 struct net_bridge_port *port,
1297 struct sk_buff *skb,
1300 unsigned int transport_len = ipv6_transport_len(skb);
1301 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1302 struct mld_msg *mld;
1303 struct net_bridge_mdb_entry *mp;
1304 struct mld2_query *mld2q;
1305 struct net_bridge_port_group *p;
1306 struct net_bridge_port_group __rcu **pp;
1308 unsigned long max_delay;
1309 unsigned long now = jiffies;
1310 unsigned int offset = skb_transport_offset(skb);
1311 const struct in6_addr *group = NULL;
1312 bool is_general_query;
1315 spin_lock(&br->multicast_lock);
1316 if (!netif_running(br->dev) ||
1317 (port && port->state == BR_STATE_DISABLED))
1320 if (transport_len == sizeof(*mld)) {
1321 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1325 mld = (struct mld_msg *) icmp6_hdr(skb);
1326 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1328 group = &mld->mld_mca;
1330 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1334 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1335 if (!mld2q->mld2q_nsrcs)
1336 group = &mld2q->mld2q_mca;
1338 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1341 is_general_query = group && ipv6_addr_any(group);
1343 if (is_general_query) {
1344 saddr.proto = htons(ETH_P_IPV6);
1345 saddr.u.ip6 = ip6h->saddr;
1347 br_multicast_query_received(br, port, &br->ip6_other_query,
1350 } else if (!group) {
1354 mp = br_mdb_ip6_get(br, group, vid);
1358 max_delay *= br->multicast_last_member_count;
1359 if (mp->host_joined &&
1360 (timer_pending(&mp->timer) ?
1361 time_after(mp->timer.expires, now + max_delay) :
1362 try_to_del_timer_sync(&mp->timer) >= 0))
1363 mod_timer(&mp->timer, now + max_delay);
1365 for (pp = &mp->ports;
1366 (p = mlock_dereference(*pp, br)) != NULL;
1368 if (timer_pending(&p->timer) ?
1369 time_after(p->timer.expires, now + max_delay) :
1370 try_to_del_timer_sync(&p->timer) >= 0)
1371 mod_timer(&p->timer, now + max_delay);
1375 spin_unlock(&br->multicast_lock);
1381 br_multicast_leave_group(struct net_bridge *br,
1382 struct net_bridge_port *port,
1383 struct br_ip *group,
1384 struct bridge_mcast_other_query *other_query,
1385 struct bridge_mcast_own_query *own_query,
1386 const unsigned char *src)
1388 struct net_bridge_mdb_entry *mp;
1389 struct net_bridge_port_group *p;
1393 spin_lock(&br->multicast_lock);
1394 if (!netif_running(br->dev) ||
1395 (port && port->state == BR_STATE_DISABLED))
1398 mp = br_mdb_ip_get(br, group);
1402 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1403 struct net_bridge_port_group __rcu **pp;
1405 for (pp = &mp->ports;
1406 (p = mlock_dereference(*pp, br)) != NULL;
1408 if (!br_port_group_equal(p, port, src))
1411 rcu_assign_pointer(*pp, p->next);
1412 hlist_del_init(&p->mglist);
1413 del_timer(&p->timer);
1415 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1418 if (!mp->ports && !mp->host_joined &&
1419 netif_running(br->dev))
1420 mod_timer(&mp->timer, jiffies);
1425 if (timer_pending(&other_query->timer))
1428 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
1429 __br_multicast_send_query(br, port, &mp->addr);
1431 time = jiffies + br->multicast_last_member_count *
1432 br->multicast_last_member_interval;
1434 mod_timer(&own_query->timer, time);
1436 for (p = mlock_dereference(mp->ports, br);
1438 p = mlock_dereference(p->next, br)) {
1439 if (!br_port_group_equal(p, port, src))
1442 if (!hlist_unhashed(&p->mglist) &&
1443 (timer_pending(&p->timer) ?
1444 time_after(p->timer.expires, time) :
1445 try_to_del_timer_sync(&p->timer) >= 0)) {
1446 mod_timer(&p->timer, time);
1454 time = now + br->multicast_last_member_count *
1455 br->multicast_last_member_interval;
1458 if (mp->host_joined &&
1459 (timer_pending(&mp->timer) ?
1460 time_after(mp->timer.expires, time) :
1461 try_to_del_timer_sync(&mp->timer) >= 0)) {
1462 mod_timer(&mp->timer, time);
1468 for (p = mlock_dereference(mp->ports, br);
1470 p = mlock_dereference(p->next, br)) {
1471 if (p->port != port)
1474 if (!hlist_unhashed(&p->mglist) &&
1475 (timer_pending(&p->timer) ?
1476 time_after(p->timer.expires, time) :
1477 try_to_del_timer_sync(&p->timer) >= 0)) {
1478 mod_timer(&p->timer, time);
1484 spin_unlock(&br->multicast_lock);
1487 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1488 struct net_bridge_port *port,
1491 const unsigned char *src)
1493 struct br_ip br_group;
1494 struct bridge_mcast_own_query *own_query;
1496 if (ipv4_is_local_multicast(group))
1499 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1501 memset(&br_group, 0, sizeof(br_group));
1502 br_group.u.ip4 = group;
1503 br_group.proto = htons(ETH_P_IP);
1506 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1510 #if IS_ENABLED(CONFIG_IPV6)
1511 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1512 struct net_bridge_port *port,
1513 const struct in6_addr *group,
1515 const unsigned char *src)
1517 struct br_ip br_group;
1518 struct bridge_mcast_own_query *own_query;
1520 if (ipv6_addr_is_ll_all_nodes(group))
1523 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1525 memset(&br_group, 0, sizeof(br_group));
1526 br_group.u.ip6 = *group;
1527 br_group.proto = htons(ETH_P_IPV6);
1530 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1535 static void br_multicast_err_count(const struct net_bridge *br,
1536 const struct net_bridge_port *p,
1539 struct bridge_mcast_stats __percpu *stats;
1540 struct bridge_mcast_stats *pstats;
1542 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1546 stats = p->mcast_stats;
1548 stats = br->mcast_stats;
1549 if (WARN_ON(!stats))
1552 pstats = this_cpu_ptr(stats);
1554 u64_stats_update_begin(&pstats->syncp);
1556 case htons(ETH_P_IP):
1557 pstats->mstats.igmp_parse_errors++;
1559 #if IS_ENABLED(CONFIG_IPV6)
1560 case htons(ETH_P_IPV6):
1561 pstats->mstats.mld_parse_errors++;
1565 u64_stats_update_end(&pstats->syncp);
1568 static void br_multicast_pim(struct net_bridge *br,
1569 struct net_bridge_port *port,
1570 const struct sk_buff *skb)
1572 unsigned int offset = skb_transport_offset(skb);
1573 struct pimhdr *pimhdr, _pimhdr;
1575 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1576 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1577 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1580 br_multicast_mark_router(br, port);
1583 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1584 struct net_bridge_port *port,
1585 struct sk_buff *skb)
1587 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1588 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1591 br_multicast_mark_router(br, port);
1596 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1597 struct net_bridge_port *port,
1598 struct sk_buff *skb,
1601 const unsigned char *src;
1605 err = ip_mc_check_igmp(skb);
1607 if (err == -ENOMSG) {
1608 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1609 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1610 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1611 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1612 br_multicast_pim(br, port, skb);
1613 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
1614 br_ip4_multicast_mrd_rcv(br, port, skb);
1618 } else if (err < 0) {
1619 br_multicast_err_count(br, port, skb->protocol);
1624 src = eth_hdr(skb)->h_source;
1625 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1628 case IGMP_HOST_MEMBERSHIP_REPORT:
1629 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1630 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1631 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1633 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1634 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
1636 case IGMP_HOST_MEMBERSHIP_QUERY:
1637 br_ip4_multicast_query(br, port, skb, vid);
1639 case IGMP_HOST_LEAVE_MESSAGE:
1640 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1644 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1650 #if IS_ENABLED(CONFIG_IPV6)
1651 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1652 struct net_bridge_port *port,
1653 struct sk_buff *skb)
1657 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1660 ret = ipv6_mc_check_icmpv6(skb);
1664 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1667 br_multicast_mark_router(br, port);
1672 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1673 struct net_bridge_port *port,
1674 struct sk_buff *skb,
1677 const unsigned char *src;
1678 struct mld_msg *mld;
1681 err = ipv6_mc_check_mld(skb);
1683 if (err == -ENOMSG) {
1684 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1685 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1687 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1688 err = br_ip6_multicast_mrd_rcv(br, port, skb);
1690 if (err < 0 && err != -ENOMSG) {
1691 br_multicast_err_count(br, port, skb->protocol);
1697 } else if (err < 0) {
1698 br_multicast_err_count(br, port, skb->protocol);
1702 mld = (struct mld_msg *)skb_transport_header(skb);
1703 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1705 switch (mld->mld_type) {
1706 case ICMPV6_MGM_REPORT:
1707 src = eth_hdr(skb)->h_source;
1708 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1709 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1712 case ICMPV6_MLD2_REPORT:
1713 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
1715 case ICMPV6_MGM_QUERY:
1716 err = br_ip6_multicast_query(br, port, skb, vid);
1718 case ICMPV6_MGM_REDUCTION:
1719 src = eth_hdr(skb)->h_source;
1720 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1724 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1731 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1732 struct sk_buff *skb, u16 vid)
1736 BR_INPUT_SKB_CB(skb)->igmp = 0;
1737 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1739 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1742 switch (skb->protocol) {
1743 case htons(ETH_P_IP):
1744 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1746 #if IS_ENABLED(CONFIG_IPV6)
1747 case htons(ETH_P_IPV6):
1748 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1756 static void br_multicast_query_expired(struct net_bridge *br,
1757 struct bridge_mcast_own_query *query,
1758 struct bridge_mcast_querier *querier)
1760 spin_lock(&br->multicast_lock);
1761 if (query->startup_sent < br->multicast_startup_query_count)
1762 query->startup_sent++;
1764 RCU_INIT_POINTER(querier->port, NULL);
1765 br_multicast_send_query(br, NULL, query);
1766 spin_unlock(&br->multicast_lock);
1769 static void br_ip4_multicast_query_expired(struct timer_list *t)
1771 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1773 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1776 #if IS_ENABLED(CONFIG_IPV6)
1777 static void br_ip6_multicast_query_expired(struct timer_list *t)
1779 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1781 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1785 void br_multicast_init(struct net_bridge *br)
1787 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
1789 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1790 br->multicast_last_member_count = 2;
1791 br->multicast_startup_query_count = 2;
1793 br->multicast_last_member_interval = HZ;
1794 br->multicast_query_response_interval = 10 * HZ;
1795 br->multicast_startup_query_interval = 125 * HZ / 4;
1796 br->multicast_query_interval = 125 * HZ;
1797 br->multicast_querier_interval = 255 * HZ;
1798 br->multicast_membership_interval = 260 * HZ;
1800 br->ip4_other_query.delay_time = 0;
1801 br->ip4_querier.port = NULL;
1802 br->multicast_igmp_version = 2;
1803 #if IS_ENABLED(CONFIG_IPV6)
1804 br->multicast_mld_version = 1;
1805 br->ip6_other_query.delay_time = 0;
1806 br->ip6_querier.port = NULL;
1808 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
1809 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
1811 spin_lock_init(&br->multicast_lock);
1812 timer_setup(&br->multicast_router_timer,
1813 br_multicast_local_router_expired, 0);
1814 timer_setup(&br->ip4_other_query.timer,
1815 br_ip4_multicast_querier_expired, 0);
1816 timer_setup(&br->ip4_own_query.timer,
1817 br_ip4_multicast_query_expired, 0);
1818 #if IS_ENABLED(CONFIG_IPV6)
1819 timer_setup(&br->ip6_other_query.timer,
1820 br_ip6_multicast_querier_expired, 0);
1821 timer_setup(&br->ip6_own_query.timer,
1822 br_ip6_multicast_query_expired, 0);
1824 INIT_HLIST_HEAD(&br->mdb_list);
1827 static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1829 struct in_device *in_dev = in_dev_get(br->dev);
1834 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1838 #if IS_ENABLED(CONFIG_IPV6)
1839 static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1841 struct in6_addr addr;
1843 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1844 ipv6_dev_mc_inc(br->dev, &addr);
1847 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1852 static void br_multicast_join_snoopers(struct net_bridge *br)
1854 br_ip4_multicast_join_snoopers(br);
1855 br_ip6_multicast_join_snoopers(br);
1858 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1860 struct in_device *in_dev = in_dev_get(br->dev);
1862 if (WARN_ON(!in_dev))
1865 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1869 #if IS_ENABLED(CONFIG_IPV6)
1870 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1872 struct in6_addr addr;
1874 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1875 ipv6_dev_mc_dec(br->dev, &addr);
1878 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1883 static void br_multicast_leave_snoopers(struct net_bridge *br)
1885 br_ip4_multicast_leave_snoopers(br);
1886 br_ip6_multicast_leave_snoopers(br);
1889 static void __br_multicast_open(struct net_bridge *br,
1890 struct bridge_mcast_own_query *query)
1892 query->startup_sent = 0;
1894 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1897 mod_timer(&query->timer, jiffies);
1900 void br_multicast_open(struct net_bridge *br)
1902 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1903 br_multicast_join_snoopers(br);
1905 __br_multicast_open(br, &br->ip4_own_query);
1906 #if IS_ENABLED(CONFIG_IPV6)
1907 __br_multicast_open(br, &br->ip6_own_query);
1911 void br_multicast_stop(struct net_bridge *br)
1913 del_timer_sync(&br->multicast_router_timer);
1914 del_timer_sync(&br->ip4_other_query.timer);
1915 del_timer_sync(&br->ip4_own_query.timer);
1916 #if IS_ENABLED(CONFIG_IPV6)
1917 del_timer_sync(&br->ip6_other_query.timer);
1918 del_timer_sync(&br->ip6_own_query.timer);
1921 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1922 br_multicast_leave_snoopers(br);
1925 void br_multicast_dev_del(struct net_bridge *br)
1927 struct net_bridge_mdb_entry *mp;
1928 struct hlist_node *tmp;
1930 spin_lock_bh(&br->multicast_lock);
1931 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1932 del_timer(&mp->timer);
1933 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1935 hlist_del_rcu(&mp->mdb_node);
1938 spin_unlock_bh(&br->multicast_lock);
1943 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1947 spin_lock_bh(&br->multicast_lock);
1950 case MDB_RTR_TYPE_DISABLED:
1951 case MDB_RTR_TYPE_PERM:
1952 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
1953 del_timer(&br->multicast_router_timer);
1954 br->multicast_router = val;
1957 case MDB_RTR_TYPE_TEMP_QUERY:
1958 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1959 br_mc_router_state_change(br, false);
1960 br->multicast_router = val;
1965 spin_unlock_bh(&br->multicast_lock);
1970 static void __del_port_router(struct net_bridge_port *p)
1972 if (hlist_unhashed(&p->rlist))
1974 hlist_del_init_rcu(&p->rlist);
1975 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1976 br_port_mc_router_state_change(p, false);
1978 /* don't allow timer refresh */
1979 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1980 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1983 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1985 struct net_bridge *br = p->br;
1986 unsigned long now = jiffies;
1989 spin_lock(&br->multicast_lock);
1990 if (p->multicast_router == val) {
1991 /* Refresh the temp router port timer */
1992 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1993 mod_timer(&p->multicast_router_timer,
1994 now + br->multicast_querier_interval);
1999 case MDB_RTR_TYPE_DISABLED:
2000 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2001 __del_port_router(p);
2002 del_timer(&p->multicast_router_timer);
2004 case MDB_RTR_TYPE_TEMP_QUERY:
2005 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2006 __del_port_router(p);
2008 case MDB_RTR_TYPE_PERM:
2009 p->multicast_router = MDB_RTR_TYPE_PERM;
2010 del_timer(&p->multicast_router_timer);
2011 br_multicast_add_router(br, p);
2013 case MDB_RTR_TYPE_TEMP:
2014 p->multicast_router = MDB_RTR_TYPE_TEMP;
2015 br_multicast_mark_router(br, p);
2022 spin_unlock(&br->multicast_lock);
2027 static void br_multicast_start_querier(struct net_bridge *br,
2028 struct bridge_mcast_own_query *query)
2030 struct net_bridge_port *port;
2032 __br_multicast_open(br, query);
2035 list_for_each_entry_rcu(port, &br->port_list, list) {
2036 if (port->state == BR_STATE_DISABLED ||
2037 port->state == BR_STATE_BLOCKING)
2040 if (query == &br->ip4_own_query)
2041 br_multicast_enable(&port->ip4_own_query);
2042 #if IS_ENABLED(CONFIG_IPV6)
2044 br_multicast_enable(&port->ip6_own_query);
2050 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2052 struct net_bridge_port *port;
2054 spin_lock_bh(&br->multicast_lock);
2055 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
2058 br_mc_disabled_update(br->dev, val);
2059 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2060 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2061 br_multicast_leave_snoopers(br);
2065 if (!netif_running(br->dev))
2068 br_multicast_open(br);
2069 list_for_each_entry(port, &br->port_list, list)
2070 __br_multicast_enable_port(port);
2073 spin_unlock_bh(&br->multicast_lock);
2078 bool br_multicast_enabled(const struct net_device *dev)
2080 struct net_bridge *br = netdev_priv(dev);
2082 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
2084 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2086 bool br_multicast_router(const struct net_device *dev)
2088 struct net_bridge *br = netdev_priv(dev);
2091 spin_lock_bh(&br->multicast_lock);
2092 is_router = br_multicast_is_router(br);
2093 spin_unlock_bh(&br->multicast_lock);
2096 EXPORT_SYMBOL_GPL(br_multicast_router);
2098 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2100 unsigned long max_delay;
2104 spin_lock_bh(&br->multicast_lock);
2105 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
2108 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
2112 max_delay = br->multicast_query_response_interval;
2114 if (!timer_pending(&br->ip4_other_query.timer))
2115 br->ip4_other_query.delay_time = jiffies + max_delay;
2117 br_multicast_start_querier(br, &br->ip4_own_query);
2119 #if IS_ENABLED(CONFIG_IPV6)
2120 if (!timer_pending(&br->ip6_other_query.timer))
2121 br->ip6_other_query.delay_time = jiffies + max_delay;
2123 br_multicast_start_querier(br, &br->ip6_own_query);
2127 spin_unlock_bh(&br->multicast_lock);
2132 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2134 /* Currently we support only version 2 and 3 */
2143 spin_lock_bh(&br->multicast_lock);
2144 br->multicast_igmp_version = val;
2145 spin_unlock_bh(&br->multicast_lock);
2150 #if IS_ENABLED(CONFIG_IPV6)
2151 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2153 /* Currently we support version 1 and 2 */
2162 spin_lock_bh(&br->multicast_lock);
2163 br->multicast_mld_version = val;
2164 spin_unlock_bh(&br->multicast_lock);
2171 * br_multicast_list_adjacent - Returns snooped multicast addresses
2172 * @dev: The bridge port adjacent to which to retrieve addresses
2173 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2175 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2176 * snooping feature on all bridge ports of dev's bridge device, excluding
2177 * the addresses from dev itself.
2179 * Returns the number of items added to br_ip_list.
2182 * - br_ip_list needs to be initialized by caller
2183 * - br_ip_list might contain duplicates in the end
2184 * (needs to be taken care of by caller)
2185 * - br_ip_list needs to be freed by caller
2187 int br_multicast_list_adjacent(struct net_device *dev,
2188 struct list_head *br_ip_list)
2190 struct net_bridge *br;
2191 struct net_bridge_port *port;
2192 struct net_bridge_port_group *group;
2193 struct br_ip_list *entry;
2197 if (!br_ip_list || !br_port_exists(dev))
2200 port = br_port_get_rcu(dev);
2201 if (!port || !port->br)
2206 list_for_each_entry_rcu(port, &br->port_list, list) {
2207 if (!port->dev || port->dev == dev)
2210 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2211 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2215 entry->addr = group->addr;
2216 list_add(&entry->list, br_ip_list);
2225 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2228 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2229 * @dev: The bridge port providing the bridge on which to check for a querier
2230 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2232 * Checks whether the given interface has a bridge on top and if so returns
2233 * true if a valid querier exists anywhere on the bridged link layer.
2234 * Otherwise returns false.
2236 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2238 struct net_bridge *br;
2239 struct net_bridge_port *port;
2244 if (!br_port_exists(dev))
2247 port = br_port_get_rcu(dev);
2248 if (!port || !port->br)
2253 memset(ð, 0, sizeof(eth));
2254 eth.h_proto = htons(proto);
2256 ret = br_multicast_querier_exists(br, ð);
2262 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2265 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2266 * @dev: The bridge port adjacent to which to check for a querier
2267 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2269 * Checks whether the given interface has a bridge on top and if so returns
2270 * true if a selected querier is behind one of the other ports of this
2271 * bridge. Otherwise returns false.
2273 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2275 struct net_bridge *br;
2276 struct net_bridge_port *port;
2280 if (!br_port_exists(dev))
2283 port = br_port_get_rcu(dev);
2284 if (!port || !port->br)
2291 if (!timer_pending(&br->ip4_other_query.timer) ||
2292 rcu_dereference(br->ip4_querier.port) == port)
2295 #if IS_ENABLED(CONFIG_IPV6)
2297 if (!timer_pending(&br->ip6_other_query.timer) ||
2298 rcu_dereference(br->ip6_querier.port) == port)
2311 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2313 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2314 const struct sk_buff *skb, u8 type, u8 dir)
2316 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2317 __be16 proto = skb->protocol;
2320 u64_stats_update_begin(&pstats->syncp);
2322 case htons(ETH_P_IP):
2323 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2325 case IGMP_HOST_MEMBERSHIP_REPORT:
2326 pstats->mstats.igmp_v1reports[dir]++;
2328 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2329 pstats->mstats.igmp_v2reports[dir]++;
2331 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2332 pstats->mstats.igmp_v3reports[dir]++;
2334 case IGMP_HOST_MEMBERSHIP_QUERY:
2335 if (t_len != sizeof(struct igmphdr)) {
2336 pstats->mstats.igmp_v3queries[dir]++;
2338 unsigned int offset = skb_transport_offset(skb);
2339 struct igmphdr *ih, _ihdr;
2341 ih = skb_header_pointer(skb, offset,
2342 sizeof(_ihdr), &_ihdr);
2346 pstats->mstats.igmp_v1queries[dir]++;
2348 pstats->mstats.igmp_v2queries[dir]++;
2351 case IGMP_HOST_LEAVE_MESSAGE:
2352 pstats->mstats.igmp_leaves[dir]++;
2356 #if IS_ENABLED(CONFIG_IPV6)
2357 case htons(ETH_P_IPV6):
2358 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2359 sizeof(struct ipv6hdr);
2360 t_len -= skb_network_header_len(skb);
2362 case ICMPV6_MGM_REPORT:
2363 pstats->mstats.mld_v1reports[dir]++;
2365 case ICMPV6_MLD2_REPORT:
2366 pstats->mstats.mld_v2reports[dir]++;
2368 case ICMPV6_MGM_QUERY:
2369 if (t_len != sizeof(struct mld_msg))
2370 pstats->mstats.mld_v2queries[dir]++;
2372 pstats->mstats.mld_v1queries[dir]++;
2374 case ICMPV6_MGM_REDUCTION:
2375 pstats->mstats.mld_leaves[dir]++;
2379 #endif /* CONFIG_IPV6 */
2381 u64_stats_update_end(&pstats->syncp);
2384 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2385 const struct sk_buff *skb, u8 type, u8 dir)
2387 struct bridge_mcast_stats __percpu *stats;
2389 /* if multicast_disabled is true then igmp type can't be set */
2390 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2394 stats = p->mcast_stats;
2396 stats = br->mcast_stats;
2397 if (WARN_ON(!stats))
2400 br_mcast_stats_add(stats, skb, type, dir);
2403 int br_multicast_init_stats(struct net_bridge *br)
2405 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2406 if (!br->mcast_stats)
2412 void br_multicast_uninit_stats(struct net_bridge *br)
2414 free_percpu(br->mcast_stats);
2417 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2419 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2420 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2423 void br_multicast_get_stats(const struct net_bridge *br,
2424 const struct net_bridge_port *p,
2425 struct br_mcast_stats *dest)
2427 struct bridge_mcast_stats __percpu *stats;
2428 struct br_mcast_stats tdst;
2431 memset(dest, 0, sizeof(*dest));
2433 stats = p->mcast_stats;
2435 stats = br->mcast_stats;
2436 if (WARN_ON(!stats))
2439 memset(&tdst, 0, sizeof(tdst));
2440 for_each_possible_cpu(i) {
2441 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2442 struct br_mcast_stats temp;
2446 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2447 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2448 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2450 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2451 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2452 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2453 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2454 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2455 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2456 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2457 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2459 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2460 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2461 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2462 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2463 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2464 tdst.mld_parse_errors += temp.mld_parse_errors;
2466 memcpy(dest, &tdst, sizeof(*dest));
2469 int br_mdb_hash_init(struct net_bridge *br)
2471 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2474 void br_mdb_hash_fini(struct net_bridge *br)
2476 rhashtable_destroy(&br->mdb_hash_tbl);