1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Bridge multicast support.
5 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
9 #include <linux/export.h>
10 #include <linux/if_ether.h>
11 #include <linux/igmp.h>
13 #include <linux/jhash.h>
14 #include <linux/kernel.h>
15 #include <linux/log2.h>
16 #include <linux/netdevice.h>
17 #include <linux/netfilter_bridge.h>
18 #include <linux/random.h>
19 #include <linux/rculist.h>
20 #include <linux/skbuff.h>
21 #include <linux/slab.h>
22 #include <linux/timer.h>
23 #include <linux/inetdevice.h>
24 #include <linux/mroute.h>
26 #include <net/switchdev.h>
27 #if IS_ENABLED(CONFIG_IPV6)
28 #include <linux/icmpv6.h>
31 #include <net/ip6_checksum.h>
32 #include <net/addrconf.h>
35 #include "br_private.h"
37 static const struct rhashtable_params br_mdb_rht_params = {
38 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
39 .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
40 .key_len = sizeof(struct br_ip),
41 .automatic_shrinking = true,
44 static const struct rhashtable_params br_sg_port_rht_params = {
45 .head_offset = offsetof(struct net_bridge_port_group, rhnode),
46 .key_offset = offsetof(struct net_bridge_port_group, key),
47 .key_len = sizeof(struct net_bridge_port_group_sg_key),
48 .automatic_shrinking = true,
51 static void br_multicast_start_querier(struct net_bridge *br,
52 struct bridge_mcast_own_query *query);
53 static void br_multicast_add_router(struct net_bridge *br,
54 struct net_bridge_port *port);
55 static void br_ip4_multicast_leave_group(struct net_bridge *br,
56 struct net_bridge_port *port,
59 const unsigned char *src);
60 static void br_multicast_port_group_rexmit(struct timer_list *t);
62 static void __del_port_router(struct net_bridge_port *p);
63 #if IS_ENABLED(CONFIG_IPV6)
64 static void br_ip6_multicast_leave_group(struct net_bridge *br,
65 struct net_bridge_port *port,
66 const struct in6_addr *group,
67 __u16 vid, const unsigned char *src);
69 static struct net_bridge_port_group *
70 __br_multicast_add_group(struct net_bridge *br,
71 struct net_bridge_port *port,
73 const unsigned char *src,
77 static void br_multicast_find_del_pg(struct net_bridge *br,
78 struct net_bridge_port_group *pg);
80 static struct net_bridge_port_group *
81 br_sg_port_find(struct net_bridge *br,
82 struct net_bridge_port_group_sg_key *sg_p)
84 lockdep_assert_held_once(&br->multicast_lock);
86 return rhashtable_lookup_fast(&br->sg_port_tbl, sg_p,
87 br_sg_port_rht_params);
90 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
93 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
96 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
99 struct net_bridge_mdb_entry *ent;
101 lockdep_assert_held_once(&br->multicast_lock);
104 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
110 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
111 __be32 dst, __u16 vid)
115 memset(&br_dst, 0, sizeof(br_dst));
116 br_dst.dst.ip4 = dst;
117 br_dst.proto = htons(ETH_P_IP);
120 return br_mdb_ip_get(br, &br_dst);
123 #if IS_ENABLED(CONFIG_IPV6)
124 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
125 const struct in6_addr *dst,
130 memset(&br_dst, 0, sizeof(br_dst));
131 br_dst.dst.ip6 = *dst;
132 br_dst.proto = htons(ETH_P_IPV6);
135 return br_mdb_ip_get(br, &br_dst);
139 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
140 struct sk_buff *skb, u16 vid)
144 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
147 if (BR_INPUT_SKB_CB(skb)->igmp)
150 memset(&ip, 0, sizeof(ip));
151 ip.proto = skb->protocol;
154 switch (skb->protocol) {
155 case htons(ETH_P_IP):
156 ip.dst.ip4 = ip_hdr(skb)->daddr;
157 if (br->multicast_igmp_version == 3) {
158 struct net_bridge_mdb_entry *mdb;
160 ip.src.ip4 = ip_hdr(skb)->saddr;
161 mdb = br_mdb_ip_get_rcu(br, &ip);
167 #if IS_ENABLED(CONFIG_IPV6)
168 case htons(ETH_P_IPV6):
169 ip.dst.ip6 = ipv6_hdr(skb)->daddr;
170 if (br->multicast_mld_version == 2) {
171 struct net_bridge_mdb_entry *mdb;
173 ip.src.ip6 = ipv6_hdr(skb)->saddr;
174 mdb = br_mdb_ip_get_rcu(br, &ip);
177 memset(&ip.src.ip6, 0, sizeof(ip.src.ip6));
183 ether_addr_copy(ip.dst.mac_addr, eth_hdr(skb)->h_dest);
186 return br_mdb_ip_get_rcu(br, &ip);
189 static bool br_port_group_equal(struct net_bridge_port_group *p,
190 struct net_bridge_port *port,
191 const unsigned char *src)
193 if (p->key.port != port)
196 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
199 return ether_addr_equal(src, p->eth_addr);
202 static void __fwd_add_star_excl(struct net_bridge_port_group *pg,
205 struct net_bridge_port_group_sg_key sg_key;
206 struct net_bridge *br = pg->key.port->br;
207 struct net_bridge_port_group *src_pg;
209 memset(&sg_key, 0, sizeof(sg_key));
210 sg_key.port = pg->key.port;
211 sg_key.addr = *sg_ip;
212 if (br_sg_port_find(br, &sg_key))
215 src_pg = __br_multicast_add_group(br, pg->key.port, sg_ip, pg->eth_addr,
216 MCAST_INCLUDE, false, false);
217 if (IS_ERR_OR_NULL(src_pg) ||
218 src_pg->rt_protocol != RTPROT_KERNEL)
221 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
224 static void __fwd_del_star_excl(struct net_bridge_port_group *pg,
227 struct net_bridge_port_group_sg_key sg_key;
228 struct net_bridge *br = pg->key.port->br;
229 struct net_bridge_port_group *src_pg;
231 memset(&sg_key, 0, sizeof(sg_key));
232 sg_key.port = pg->key.port;
233 sg_key.addr = *sg_ip;
234 src_pg = br_sg_port_find(br, &sg_key);
235 if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) ||
236 src_pg->rt_protocol != RTPROT_KERNEL)
239 br_multicast_find_del_pg(br, src_pg);
242 /* When a port group transitions to (or is added as) EXCLUDE we need to add it
243 * to all other ports' S,G entries which are not blocked by the current group
244 * for proper replication, the assumption is that any S,G blocked entries
245 * are already added so the S,G,port lookup should skip them.
246 * When a port group transitions from EXCLUDE -> INCLUDE mode or is being
247 * deleted we need to remove it from all ports' S,G entries where it was
248 * automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL).
250 void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
253 struct net_bridge *br = pg->key.port->br;
254 struct net_bridge_port_group *pg_lst;
255 struct net_bridge_mdb_entry *mp;
258 if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr)))
261 mp = br_mdb_ip_get(br, &pg->key.addr);
265 memset(&sg_ip, 0, sizeof(sg_ip));
266 sg_ip = pg->key.addr;
267 for (pg_lst = mlock_dereference(mp->ports, br);
269 pg_lst = mlock_dereference(pg_lst->next, br)) {
270 struct net_bridge_group_src *src_ent;
274 hlist_for_each_entry(src_ent, &pg_lst->src_list, node) {
275 if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
277 sg_ip.src = src_ent->addr.src;
278 switch (filter_mode) {
280 __fwd_del_star_excl(pg, &sg_ip);
283 __fwd_add_star_excl(pg, &sg_ip);
290 /* called when adding a new S,G with host_joined == false by default */
291 static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp,
292 struct net_bridge_port_group *sg)
294 struct net_bridge_mdb_entry *sg_mp;
296 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
298 if (!star_mp->host_joined)
301 sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr);
304 sg_mp->host_joined = true;
307 /* set the host_joined state of all of *,G's S,G entries */
308 static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp)
310 struct net_bridge *br = star_mp->br;
311 struct net_bridge_mdb_entry *sg_mp;
312 struct net_bridge_port_group *pg;
315 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
318 memset(&sg_ip, 0, sizeof(sg_ip));
319 sg_ip = star_mp->addr;
320 for (pg = mlock_dereference(star_mp->ports, br);
322 pg = mlock_dereference(pg->next, br)) {
323 struct net_bridge_group_src *src_ent;
325 hlist_for_each_entry(src_ent, &pg->src_list, node) {
326 if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
328 sg_ip.src = src_ent->addr.src;
329 sg_mp = br_mdb_ip_get(br, &sg_ip);
332 sg_mp->host_joined = star_mp->host_joined;
337 static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp)
339 struct net_bridge_port_group __rcu **pp;
340 struct net_bridge_port_group *p;
342 /* *,G exclude ports are only added to S,G entries */
343 if (WARN_ON(br_multicast_is_star_g(&sgmp->addr)))
346 /* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports
347 * we should ignore perm entries since they're managed by user-space
349 for (pp = &sgmp->ports;
350 (p = mlock_dereference(*pp, sgmp->br)) != NULL;
352 if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL |
353 MDB_PG_FLAGS_PERMANENT)))
356 /* currently the host can only have joined the *,G which means
357 * we treat it as EXCLUDE {}, so for an S,G it's considered a
358 * STAR_EXCLUDE entry and we can safely leave it
360 sgmp->host_joined = false;
362 for (pp = &sgmp->ports;
363 (p = mlock_dereference(*pp, sgmp->br)) != NULL;) {
364 if (!(p->flags & MDB_PG_FLAGS_PERMANENT))
365 br_multicast_del_pg(sgmp, p, pp);
371 void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
372 struct net_bridge_port_group *sg)
374 struct net_bridge_port_group_sg_key sg_key;
375 struct net_bridge *br = star_mp->br;
376 struct net_bridge_port_group *pg;
378 if (WARN_ON(br_multicast_is_star_g(&sg->key.addr)))
380 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
383 br_multicast_sg_host_state(star_mp, sg);
384 memset(&sg_key, 0, sizeof(sg_key));
385 sg_key.addr = sg->key.addr;
386 /* we need to add all exclude ports to the S,G */
387 for (pg = mlock_dereference(star_mp->ports, br);
389 pg = mlock_dereference(pg->next, br)) {
390 struct net_bridge_port_group *src_pg;
392 if (pg == sg || pg->filter_mode == MCAST_INCLUDE)
395 sg_key.port = pg->key.port;
396 if (br_sg_port_find(br, &sg_key))
399 src_pg = __br_multicast_add_group(br, pg->key.port,
402 MCAST_INCLUDE, false, false);
403 if (IS_ERR_OR_NULL(src_pg) ||
404 src_pg->rt_protocol != RTPROT_KERNEL)
406 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
410 static void br_multicast_fwd_src_add(struct net_bridge_group_src *src)
412 struct net_bridge_mdb_entry *star_mp;
413 struct net_bridge_port_group *sg;
416 if (src->flags & BR_SGRP_F_INSTALLED)
419 memset(&sg_ip, 0, sizeof(sg_ip));
420 sg_ip = src->pg->key.addr;
421 sg_ip.src = src->addr.src;
422 sg = __br_multicast_add_group(src->br, src->pg->key.port, &sg_ip,
423 src->pg->eth_addr, MCAST_INCLUDE, false,
424 !timer_pending(&src->timer));
425 if (IS_ERR_OR_NULL(sg))
427 src->flags |= BR_SGRP_F_INSTALLED;
428 sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL;
430 /* if it was added by user-space as perm we can skip next steps */
431 if (sg->rt_protocol != RTPROT_KERNEL &&
432 (sg->flags & MDB_PG_FLAGS_PERMANENT))
435 /* the kernel is now responsible for removing this S,G */
436 del_timer(&sg->timer);
437 star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr);
441 br_multicast_sg_add_exclude_ports(star_mp, sg);
444 static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src)
446 struct net_bridge_port_group *p, *pg = src->pg;
447 struct net_bridge_port_group __rcu **pp;
448 struct net_bridge_mdb_entry *mp;
451 memset(&sg_ip, 0, sizeof(sg_ip));
452 sg_ip = pg->key.addr;
453 sg_ip.src = src->addr.src;
455 mp = br_mdb_ip_get(src->br, &sg_ip);
459 for (pp = &mp->ports;
460 (p = mlock_dereference(*pp, src->br)) != NULL;
462 if (!br_port_group_equal(p, pg->key.port, pg->eth_addr))
465 if (p->rt_protocol != RTPROT_KERNEL &&
466 (p->flags & MDB_PG_FLAGS_PERMANENT))
469 br_multicast_del_pg(mp, p, pp);
472 src->flags &= ~BR_SGRP_F_INSTALLED;
475 /* install S,G and based on src's timer enable or disable forwarding */
476 static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src)
478 struct net_bridge_port_group_sg_key sg_key;
479 struct net_bridge_port_group *sg;
482 br_multicast_fwd_src_add(src);
484 memset(&sg_key, 0, sizeof(sg_key));
485 sg_key.addr = src->pg->key.addr;
486 sg_key.addr.src = src->addr.src;
487 sg_key.port = src->pg->key.port;
489 sg = br_sg_port_find(src->br, &sg_key);
490 if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT))
493 old_flags = sg->flags;
494 if (timer_pending(&src->timer))
495 sg->flags &= ~MDB_PG_FLAGS_BLOCKED;
497 sg->flags |= MDB_PG_FLAGS_BLOCKED;
499 if (old_flags != sg->flags) {
500 struct net_bridge_mdb_entry *sg_mp;
502 sg_mp = br_mdb_ip_get(src->br, &sg_key.addr);
505 br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB);
509 static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc)
511 struct net_bridge_mdb_entry *mp;
513 mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc);
514 WARN_ON(!hlist_unhashed(&mp->mdb_node));
517 del_timer_sync(&mp->timer);
521 static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp)
523 struct net_bridge *br = mp->br;
525 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
527 hlist_del_init_rcu(&mp->mdb_node);
528 hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list);
529 queue_work(system_long_wq, &br->mcast_gc_work);
532 static void br_multicast_group_expired(struct timer_list *t)
534 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
535 struct net_bridge *br = mp->br;
537 spin_lock(&br->multicast_lock);
538 if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) ||
539 timer_pending(&mp->timer))
542 br_multicast_host_leave(mp, true);
546 br_multicast_del_mdb_entry(mp);
548 spin_unlock(&br->multicast_lock);
551 static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc)
553 struct net_bridge_group_src *src;
555 src = container_of(gc, struct net_bridge_group_src, mcast_gc);
556 WARN_ON(!hlist_unhashed(&src->node));
558 del_timer_sync(&src->timer);
562 static void br_multicast_del_group_src(struct net_bridge_group_src *src)
564 struct net_bridge *br = src->pg->key.port->br;
566 br_multicast_fwd_src_remove(src);
567 hlist_del_init_rcu(&src->node);
569 hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list);
570 queue_work(system_long_wq, &br->mcast_gc_work);
573 static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc)
575 struct net_bridge_port_group *pg;
577 pg = container_of(gc, struct net_bridge_port_group, mcast_gc);
578 WARN_ON(!hlist_unhashed(&pg->mglist));
579 WARN_ON(!hlist_empty(&pg->src_list));
581 del_timer_sync(&pg->rexmit_timer);
582 del_timer_sync(&pg->timer);
586 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
587 struct net_bridge_port_group *pg,
588 struct net_bridge_port_group __rcu **pp)
590 struct net_bridge *br = pg->key.port->br;
591 struct net_bridge_group_src *ent;
592 struct hlist_node *tmp;
594 rcu_assign_pointer(*pp, pg->next);
595 hlist_del_init(&pg->mglist);
596 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
597 br_multicast_del_group_src(ent);
598 br_mdb_notify(br->dev, mp, pg, RTM_DELMDB);
599 if (!br_multicast_is_star_g(&mp->addr)) {
600 rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode,
601 br_sg_port_rht_params);
602 br_multicast_sg_del_exclude_ports(mp);
604 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
606 hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list);
607 queue_work(system_long_wq, &br->mcast_gc_work);
609 if (!mp->ports && !mp->host_joined && netif_running(br->dev))
610 mod_timer(&mp->timer, jiffies);
613 static void br_multicast_find_del_pg(struct net_bridge *br,
614 struct net_bridge_port_group *pg)
616 struct net_bridge_port_group __rcu **pp;
617 struct net_bridge_mdb_entry *mp;
618 struct net_bridge_port_group *p;
620 mp = br_mdb_ip_get(br, &pg->key.addr);
624 for (pp = &mp->ports;
625 (p = mlock_dereference(*pp, br)) != NULL;
630 br_multicast_del_pg(mp, pg, pp);
637 static void br_multicast_port_group_expired(struct timer_list *t)
639 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
640 struct net_bridge_group_src *src_ent;
641 struct net_bridge *br = pg->key.port->br;
642 struct hlist_node *tmp;
645 spin_lock(&br->multicast_lock);
646 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
647 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
650 changed = !!(pg->filter_mode == MCAST_EXCLUDE);
651 pg->filter_mode = MCAST_INCLUDE;
652 hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) {
653 if (!timer_pending(&src_ent->timer)) {
654 br_multicast_del_group_src(src_ent);
659 if (hlist_empty(&pg->src_list)) {
660 br_multicast_find_del_pg(br, pg);
661 } else if (changed) {
662 struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr);
664 if (changed && br_multicast_is_star_g(&pg->key.addr))
665 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
669 br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB);
672 spin_unlock(&br->multicast_lock);
675 static void br_multicast_gc(struct hlist_head *head)
677 struct net_bridge_mcast_gc *gcent;
678 struct hlist_node *tmp;
680 hlist_for_each_entry_safe(gcent, tmp, head, gc_node) {
681 hlist_del_init(&gcent->gc_node);
682 gcent->destroy(gcent);
686 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
687 struct net_bridge_port_group *pg,
688 __be32 ip_dst, __be32 group,
689 bool with_srcs, bool over_lmqt,
690 u8 sflag, u8 *igmp_type,
693 struct net_bridge_port *p = pg ? pg->key.port : NULL;
694 struct net_bridge_group_src *ent;
695 size_t pkt_size, igmp_hdr_size;
696 unsigned long now = jiffies;
697 struct igmpv3_query *ihv3;
698 void *csum_start = NULL;
699 __sum16 *csum = NULL;
707 igmp_hdr_size = sizeof(*ih);
708 if (br->multicast_igmp_version == 3) {
709 igmp_hdr_size = sizeof(*ihv3);
710 if (pg && with_srcs) {
711 lmqt = now + (br->multicast_last_member_interval *
712 br->multicast_last_member_count);
713 hlist_for_each_entry(ent, &pg->src_list, node) {
714 if (over_lmqt == time_after(ent->timer.expires,
716 ent->src_query_rexmit_cnt > 0)
722 igmp_hdr_size += lmqt_srcs * sizeof(__be32);
726 pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size;
727 if ((p && pkt_size > p->dev->mtu) ||
728 pkt_size > br->dev->mtu)
731 skb = netdev_alloc_skb_ip_align(br->dev, pkt_size);
735 skb->protocol = htons(ETH_P_IP);
737 skb_reset_mac_header(skb);
740 ether_addr_copy(eth->h_source, br->dev->dev_addr);
741 ip_eth_mc_map(ip_dst, eth->h_dest);
742 eth->h_proto = htons(ETH_P_IP);
743 skb_put(skb, sizeof(*eth));
745 skb_set_network_header(skb, skb->len);
747 iph->tot_len = htons(pkt_size - sizeof(*eth));
753 iph->frag_off = htons(IP_DF);
755 iph->protocol = IPPROTO_IGMP;
756 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
757 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
759 ((u8 *)&iph[1])[0] = IPOPT_RA;
760 ((u8 *)&iph[1])[1] = 4;
761 ((u8 *)&iph[1])[2] = 0;
762 ((u8 *)&iph[1])[3] = 0;
766 skb_set_transport_header(skb, skb->len);
767 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
769 switch (br->multicast_igmp_version) {
772 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
773 ih->code = (group ? br->multicast_last_member_interval :
774 br->multicast_query_response_interval) /
775 (HZ / IGMP_TIMER_SCALE);
779 csum_start = (void *)ih;
782 ihv3 = igmpv3_query_hdr(skb);
783 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
784 ihv3->code = (group ? br->multicast_last_member_interval :
785 br->multicast_query_response_interval) /
786 (HZ / IGMP_TIMER_SCALE);
788 ihv3->qqic = br->multicast_query_interval / HZ;
789 ihv3->nsrcs = htons(lmqt_srcs);
791 ihv3->suppress = sflag;
795 csum_start = (void *)ihv3;
796 if (!pg || !with_srcs)
800 hlist_for_each_entry(ent, &pg->src_list, node) {
801 if (over_lmqt == time_after(ent->timer.expires,
803 ent->src_query_rexmit_cnt > 0) {
804 ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4;
805 ent->src_query_rexmit_cnt--;
806 if (need_rexmit && ent->src_query_rexmit_cnt)
810 if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) {
817 if (WARN_ON(!csum || !csum_start)) {
822 *csum = ip_compute_csum(csum_start, igmp_hdr_size);
823 skb_put(skb, igmp_hdr_size);
824 __skb_pull(skb, sizeof(*eth));
830 #if IS_ENABLED(CONFIG_IPV6)
831 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
832 struct net_bridge_port_group *pg,
833 const struct in6_addr *ip6_dst,
834 const struct in6_addr *group,
835 bool with_srcs, bool over_llqt,
836 u8 sflag, u8 *igmp_type,
839 struct net_bridge_port *p = pg ? pg->key.port : NULL;
840 struct net_bridge_group_src *ent;
841 size_t pkt_size, mld_hdr_size;
842 unsigned long now = jiffies;
843 struct mld2_query *mld2q;
844 void *csum_start = NULL;
845 unsigned long interval;
846 __sum16 *csum = NULL;
847 struct ipv6hdr *ip6h;
848 struct mld_msg *mldq;
855 mld_hdr_size = sizeof(*mldq);
856 if (br->multicast_mld_version == 2) {
857 mld_hdr_size = sizeof(*mld2q);
858 if (pg && with_srcs) {
859 llqt = now + (br->multicast_last_member_interval *
860 br->multicast_last_member_count);
861 hlist_for_each_entry(ent, &pg->src_list, node) {
862 if (over_llqt == time_after(ent->timer.expires,
864 ent->src_query_rexmit_cnt > 0)
870 mld_hdr_size += llqt_srcs * sizeof(struct in6_addr);
874 pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size;
875 if ((p && pkt_size > p->dev->mtu) ||
876 pkt_size > br->dev->mtu)
879 skb = netdev_alloc_skb_ip_align(br->dev, pkt_size);
883 skb->protocol = htons(ETH_P_IPV6);
885 /* Ethernet header */
886 skb_reset_mac_header(skb);
889 ether_addr_copy(eth->h_source, br->dev->dev_addr);
890 eth->h_proto = htons(ETH_P_IPV6);
891 skb_put(skb, sizeof(*eth));
893 /* IPv6 header + HbH option */
894 skb_set_network_header(skb, skb->len);
895 ip6h = ipv6_hdr(skb);
897 *(__force __be32 *)ip6h = htonl(0x60000000);
898 ip6h->payload_len = htons(8 + mld_hdr_size);
899 ip6h->nexthdr = IPPROTO_HOPOPTS;
901 ip6h->daddr = *ip6_dst;
902 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
905 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
909 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
910 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
912 hopopt = (u8 *)(ip6h + 1);
913 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
914 hopopt[1] = 0; /* length of HbH */
915 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
916 hopopt[3] = 2; /* Length of RA Option */
917 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
919 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
920 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
922 skb_put(skb, sizeof(*ip6h) + 8);
925 skb_set_transport_header(skb, skb->len);
926 interval = ipv6_addr_any(group) ?
927 br->multicast_query_response_interval :
928 br->multicast_last_member_interval;
929 *igmp_type = ICMPV6_MGM_QUERY;
930 switch (br->multicast_mld_version) {
932 mldq = (struct mld_msg *)icmp6_hdr(skb);
933 mldq->mld_type = ICMPV6_MGM_QUERY;
936 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
937 mldq->mld_reserved = 0;
938 mldq->mld_mca = *group;
939 csum = &mldq->mld_cksum;
940 csum_start = (void *)mldq;
943 mld2q = (struct mld2_query *)icmp6_hdr(skb);
944 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
945 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
946 mld2q->mld2q_code = 0;
947 mld2q->mld2q_cksum = 0;
948 mld2q->mld2q_resv1 = 0;
949 mld2q->mld2q_resv2 = 0;
950 mld2q->mld2q_suppress = sflag;
951 mld2q->mld2q_qrv = 2;
952 mld2q->mld2q_nsrcs = htons(llqt_srcs);
953 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
954 mld2q->mld2q_mca = *group;
955 csum = &mld2q->mld2q_cksum;
956 csum_start = (void *)mld2q;
957 if (!pg || !with_srcs)
961 hlist_for_each_entry(ent, &pg->src_list, node) {
962 if (over_llqt == time_after(ent->timer.expires,
964 ent->src_query_rexmit_cnt > 0) {
965 mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6;
966 ent->src_query_rexmit_cnt--;
967 if (need_rexmit && ent->src_query_rexmit_cnt)
971 if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) {
978 if (WARN_ON(!csum || !csum_start)) {
983 *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size,
985 csum_partial(csum_start, mld_hdr_size, 0));
986 skb_put(skb, mld_hdr_size);
987 __skb_pull(skb, sizeof(*eth));
994 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
995 struct net_bridge_port_group *pg,
996 struct br_ip *ip_dst,
998 bool with_srcs, bool over_lmqt,
999 u8 sflag, u8 *igmp_type,
1004 switch (group->proto) {
1005 case htons(ETH_P_IP):
1006 ip4_dst = ip_dst ? ip_dst->dst.ip4 : htonl(INADDR_ALLHOSTS_GROUP);
1007 return br_ip4_multicast_alloc_query(br, pg,
1008 ip4_dst, group->dst.ip4,
1009 with_srcs, over_lmqt,
1012 #if IS_ENABLED(CONFIG_IPV6)
1013 case htons(ETH_P_IPV6): {
1014 struct in6_addr ip6_dst;
1017 ip6_dst = ip_dst->dst.ip6;
1019 ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0,
1022 return br_ip6_multicast_alloc_query(br, pg,
1023 &ip6_dst, &group->dst.ip6,
1024 with_srcs, over_lmqt,
1033 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
1034 struct br_ip *group)
1036 struct net_bridge_mdb_entry *mp;
1039 mp = br_mdb_ip_get(br, group);
1043 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
1044 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
1045 return ERR_PTR(-E2BIG);
1048 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
1050 return ERR_PTR(-ENOMEM);
1054 mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry;
1055 timer_setup(&mp->timer, br_multicast_group_expired, 0);
1056 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
1062 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
1068 static void br_multicast_group_src_expired(struct timer_list *t)
1070 struct net_bridge_group_src *src = from_timer(src, t, timer);
1071 struct net_bridge_port_group *pg;
1072 struct net_bridge *br = src->br;
1074 spin_lock(&br->multicast_lock);
1075 if (hlist_unhashed(&src->node) || !netif_running(br->dev) ||
1076 timer_pending(&src->timer))
1080 if (pg->filter_mode == MCAST_INCLUDE) {
1081 br_multicast_del_group_src(src);
1082 if (!hlist_empty(&pg->src_list))
1084 br_multicast_find_del_pg(br, pg);
1086 br_multicast_fwd_src_handle(src);
1090 spin_unlock(&br->multicast_lock);
1093 static struct net_bridge_group_src *
1094 br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip)
1096 struct net_bridge_group_src *ent;
1098 switch (ip->proto) {
1099 case htons(ETH_P_IP):
1100 hlist_for_each_entry(ent, &pg->src_list, node)
1101 if (ip->src.ip4 == ent->addr.src.ip4)
1104 #if IS_ENABLED(CONFIG_IPV6)
1105 case htons(ETH_P_IPV6):
1106 hlist_for_each_entry(ent, &pg->src_list, node)
1107 if (!ipv6_addr_cmp(&ent->addr.src.ip6, &ip->src.ip6))
1116 static struct net_bridge_group_src *
1117 br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip)
1119 struct net_bridge_group_src *grp_src;
1121 if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT))
1124 switch (src_ip->proto) {
1125 case htons(ETH_P_IP):
1126 if (ipv4_is_zeronet(src_ip->src.ip4) ||
1127 ipv4_is_multicast(src_ip->src.ip4))
1130 #if IS_ENABLED(CONFIG_IPV6)
1131 case htons(ETH_P_IPV6):
1132 if (ipv6_addr_any(&src_ip->src.ip6) ||
1133 ipv6_addr_is_multicast(&src_ip->src.ip6))
1139 grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC);
1140 if (unlikely(!grp_src))
1144 grp_src->br = pg->key.port->br;
1145 grp_src->addr = *src_ip;
1146 grp_src->mcast_gc.destroy = br_multicast_destroy_group_src;
1147 timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0);
1149 hlist_add_head_rcu(&grp_src->node, &pg->src_list);
1155 struct net_bridge_port_group *br_multicast_new_port_group(
1156 struct net_bridge_port *port,
1157 struct br_ip *group,
1158 struct net_bridge_port_group __rcu *next,
1159 unsigned char flags,
1160 const unsigned char *src,
1164 struct net_bridge_port_group *p;
1166 p = kzalloc(sizeof(*p), GFP_ATOMIC);
1170 p->key.addr = *group;
1173 p->filter_mode = filter_mode;
1174 p->rt_protocol = rt_protocol;
1175 p->mcast_gc.destroy = br_multicast_destroy_port_group;
1176 INIT_HLIST_HEAD(&p->src_list);
1178 if (!br_multicast_is_star_g(group) &&
1179 rhashtable_lookup_insert_fast(&port->br->sg_port_tbl, &p->rhnode,
1180 br_sg_port_rht_params)) {
1185 rcu_assign_pointer(p->next, next);
1186 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
1187 timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0);
1188 hlist_add_head(&p->mglist, &port->mglist);
1191 memcpy(p->eth_addr, src, ETH_ALEN);
1193 eth_broadcast_addr(p->eth_addr);
1198 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify)
1200 if (!mp->host_joined) {
1201 mp->host_joined = true;
1202 if (br_multicast_is_star_g(&mp->addr))
1203 br_multicast_star_g_host_state(mp);
1205 br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB);
1208 if (br_group_is_l2(&mp->addr))
1211 mod_timer(&mp->timer, jiffies + mp->br->multicast_membership_interval);
1214 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify)
1216 if (!mp->host_joined)
1219 mp->host_joined = false;
1220 if (br_multicast_is_star_g(&mp->addr))
1221 br_multicast_star_g_host_state(mp);
1223 br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB);
1226 static struct net_bridge_port_group *
1227 __br_multicast_add_group(struct net_bridge *br,
1228 struct net_bridge_port *port,
1229 struct br_ip *group,
1230 const unsigned char *src,
1235 struct net_bridge_port_group __rcu **pp;
1236 struct net_bridge_port_group *p = NULL;
1237 struct net_bridge_mdb_entry *mp;
1238 unsigned long now = jiffies;
1240 if (!netif_running(br->dev) ||
1241 (port && port->state == BR_STATE_DISABLED))
1244 mp = br_multicast_new_group(br, group);
1246 return ERR_PTR(PTR_ERR(mp));
1249 br_multicast_host_join(mp, true);
1253 for (pp = &mp->ports;
1254 (p = mlock_dereference(*pp, br)) != NULL;
1256 if (br_port_group_equal(p, port, src))
1258 if ((unsigned long)p->key.port < (unsigned long)port)
1262 p = br_multicast_new_port_group(port, group, *pp, 0, src,
1263 filter_mode, RTPROT_KERNEL);
1265 p = ERR_PTR(-ENOMEM);
1268 rcu_assign_pointer(*pp, p);
1270 p->flags |= MDB_PG_FLAGS_BLOCKED;
1271 br_mdb_notify(br->dev, mp, p, RTM_NEWMDB);
1275 mod_timer(&p->timer, now + br->multicast_membership_interval);
1281 static int br_multicast_add_group(struct net_bridge *br,
1282 struct net_bridge_port *port,
1283 struct br_ip *group,
1284 const unsigned char *src,
1288 struct net_bridge_port_group *pg;
1291 spin_lock(&br->multicast_lock);
1292 pg = __br_multicast_add_group(br, port, group, src, filter_mode,
1293 igmpv2_mldv1, false);
1294 /* NULL is considered valid for host joined groups */
1295 err = IS_ERR(pg) ? PTR_ERR(pg) : 0;
1296 spin_unlock(&br->multicast_lock);
1301 static int br_ip4_multicast_add_group(struct net_bridge *br,
1302 struct net_bridge_port *port,
1305 const unsigned char *src,
1308 struct br_ip br_group;
1311 if (ipv4_is_local_multicast(group))
1314 memset(&br_group, 0, sizeof(br_group));
1315 br_group.dst.ip4 = group;
1316 br_group.proto = htons(ETH_P_IP);
1318 filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE;
1320 return br_multicast_add_group(br, port, &br_group, src, filter_mode,
1324 #if IS_ENABLED(CONFIG_IPV6)
1325 static int br_ip6_multicast_add_group(struct net_bridge *br,
1326 struct net_bridge_port *port,
1327 const struct in6_addr *group,
1329 const unsigned char *src,
1332 struct br_ip br_group;
1335 if (ipv6_addr_is_ll_all_nodes(group))
1338 memset(&br_group, 0, sizeof(br_group));
1339 br_group.dst.ip6 = *group;
1340 br_group.proto = htons(ETH_P_IPV6);
1342 filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE;
1344 return br_multicast_add_group(br, port, &br_group, src, filter_mode,
1349 static void br_multicast_router_expired(struct timer_list *t)
1351 struct net_bridge_port *port =
1352 from_timer(port, t, multicast_router_timer);
1353 struct net_bridge *br = port->br;
1355 spin_lock(&br->multicast_lock);
1356 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1357 port->multicast_router == MDB_RTR_TYPE_PERM ||
1358 timer_pending(&port->multicast_router_timer))
1361 __del_port_router(port);
1363 spin_unlock(&br->multicast_lock);
1366 static void br_mc_router_state_change(struct net_bridge *p,
1369 struct switchdev_attr attr = {
1371 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
1372 .flags = SWITCHDEV_F_DEFER,
1373 .u.mrouter = is_mc_router,
1376 switchdev_port_attr_set(p->dev, &attr);
1379 static void br_multicast_local_router_expired(struct timer_list *t)
1381 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
1383 spin_lock(&br->multicast_lock);
1384 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
1385 br->multicast_router == MDB_RTR_TYPE_PERM ||
1386 timer_pending(&br->multicast_router_timer))
1389 br_mc_router_state_change(br, false);
1391 spin_unlock(&br->multicast_lock);
1394 static void br_multicast_querier_expired(struct net_bridge *br,
1395 struct bridge_mcast_own_query *query)
1397 spin_lock(&br->multicast_lock);
1398 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1401 br_multicast_start_querier(br, query);
1404 spin_unlock(&br->multicast_lock);
1407 static void br_ip4_multicast_querier_expired(struct timer_list *t)
1409 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
1411 br_multicast_querier_expired(br, &br->ip4_own_query);
1414 #if IS_ENABLED(CONFIG_IPV6)
1415 static void br_ip6_multicast_querier_expired(struct timer_list *t)
1417 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
1419 br_multicast_querier_expired(br, &br->ip6_own_query);
1423 static void br_multicast_select_own_querier(struct net_bridge *br,
1425 struct sk_buff *skb)
1427 if (ip->proto == htons(ETH_P_IP))
1428 br->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr;
1429 #if IS_ENABLED(CONFIG_IPV6)
1431 br->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr;
1435 static void __br_multicast_send_query(struct net_bridge *br,
1436 struct net_bridge_port *port,
1437 struct net_bridge_port_group *pg,
1438 struct br_ip *ip_dst,
1439 struct br_ip *group,
1444 bool over_lmqt = !!sflag;
1445 struct sk_buff *skb;
1449 skb = br_multicast_alloc_query(br, pg, ip_dst, group, with_srcs,
1450 over_lmqt, sflag, &igmp_type,
1456 skb->dev = port->dev;
1457 br_multicast_count(br, port, skb, igmp_type,
1459 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
1460 dev_net(port->dev), NULL, skb, NULL, skb->dev,
1461 br_dev_queue_push_xmit);
1463 if (over_lmqt && with_srcs && sflag) {
1465 goto again_under_lmqt;
1468 br_multicast_select_own_querier(br, group, skb);
1469 br_multicast_count(br, port, skb, igmp_type,
1475 static void br_multicast_send_query(struct net_bridge *br,
1476 struct net_bridge_port *port,
1477 struct bridge_mcast_own_query *own_query)
1479 struct bridge_mcast_other_query *other_query = NULL;
1480 struct br_ip br_group;
1483 if (!netif_running(br->dev) ||
1484 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
1485 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
1488 memset(&br_group.dst, 0, sizeof(br_group.dst));
1490 if (port ? (own_query == &port->ip4_own_query) :
1491 (own_query == &br->ip4_own_query)) {
1492 other_query = &br->ip4_other_query;
1493 br_group.proto = htons(ETH_P_IP);
1494 #if IS_ENABLED(CONFIG_IPV6)
1496 other_query = &br->ip6_other_query;
1497 br_group.proto = htons(ETH_P_IPV6);
1501 if (!other_query || timer_pending(&other_query->timer))
1504 __br_multicast_send_query(br, port, NULL, NULL, &br_group, false, 0,
1508 time += own_query->startup_sent < br->multicast_startup_query_count ?
1509 br->multicast_startup_query_interval :
1510 br->multicast_query_interval;
1511 mod_timer(&own_query->timer, time);
1515 br_multicast_port_query_expired(struct net_bridge_port *port,
1516 struct bridge_mcast_own_query *query)
1518 struct net_bridge *br = port->br;
1520 spin_lock(&br->multicast_lock);
1521 if (port->state == BR_STATE_DISABLED ||
1522 port->state == BR_STATE_BLOCKING)
1525 if (query->startup_sent < br->multicast_startup_query_count)
1526 query->startup_sent++;
1528 br_multicast_send_query(port->br, port, query);
1531 spin_unlock(&br->multicast_lock);
1534 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
1536 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
1538 br_multicast_port_query_expired(port, &port->ip4_own_query);
1541 #if IS_ENABLED(CONFIG_IPV6)
1542 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
1544 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
1546 br_multicast_port_query_expired(port, &port->ip6_own_query);
1550 static void br_multicast_port_group_rexmit(struct timer_list *t)
1552 struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer);
1553 struct bridge_mcast_other_query *other_query = NULL;
1554 struct net_bridge *br = pg->key.port->br;
1555 bool need_rexmit = false;
1557 spin_lock(&br->multicast_lock);
1558 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
1559 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
1560 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
1563 if (pg->key.addr.proto == htons(ETH_P_IP))
1564 other_query = &br->ip4_other_query;
1565 #if IS_ENABLED(CONFIG_IPV6)
1567 other_query = &br->ip6_other_query;
1570 if (!other_query || timer_pending(&other_query->timer))
1573 if (pg->grp_query_rexmit_cnt) {
1574 pg->grp_query_rexmit_cnt--;
1575 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1576 &pg->key.addr, false, 1, NULL);
1578 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1579 &pg->key.addr, true, 0, &need_rexmit);
1581 if (pg->grp_query_rexmit_cnt || need_rexmit)
1582 mod_timer(&pg->rexmit_timer, jiffies +
1583 br->multicast_last_member_interval);
1585 spin_unlock(&br->multicast_lock);
1588 static void br_mc_disabled_update(struct net_device *dev, bool value)
1590 struct switchdev_attr attr = {
1592 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1593 .flags = SWITCHDEV_F_DEFER,
1594 .u.mc_disabled = !value,
1597 switchdev_port_attr_set(dev, &attr);
1600 int br_multicast_add_port(struct net_bridge_port *port)
1602 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1604 timer_setup(&port->multicast_router_timer,
1605 br_multicast_router_expired, 0);
1606 timer_setup(&port->ip4_own_query.timer,
1607 br_ip4_multicast_port_query_expired, 0);
1608 #if IS_ENABLED(CONFIG_IPV6)
1609 timer_setup(&port->ip6_own_query.timer,
1610 br_ip6_multicast_port_query_expired, 0);
1612 br_mc_disabled_update(port->dev,
1613 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
1615 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1616 if (!port->mcast_stats)
1622 void br_multicast_del_port(struct net_bridge_port *port)
1624 struct net_bridge *br = port->br;
1625 struct net_bridge_port_group *pg;
1626 HLIST_HEAD(deleted_head);
1627 struct hlist_node *n;
1629 /* Take care of the remaining groups, only perm ones should be left */
1630 spin_lock_bh(&br->multicast_lock);
1631 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1632 br_multicast_find_del_pg(br, pg);
1633 hlist_move_list(&br->mcast_gc_list, &deleted_head);
1634 spin_unlock_bh(&br->multicast_lock);
1635 br_multicast_gc(&deleted_head);
1636 del_timer_sync(&port->multicast_router_timer);
1637 free_percpu(port->mcast_stats);
1640 static void br_multicast_enable(struct bridge_mcast_own_query *query)
1642 query->startup_sent = 0;
1644 if (try_to_del_timer_sync(&query->timer) >= 0 ||
1645 del_timer(&query->timer))
1646 mod_timer(&query->timer, jiffies);
1649 static void __br_multicast_enable_port(struct net_bridge_port *port)
1651 struct net_bridge *br = port->br;
1653 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
1656 br_multicast_enable(&port->ip4_own_query);
1657 #if IS_ENABLED(CONFIG_IPV6)
1658 br_multicast_enable(&port->ip6_own_query);
1660 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1661 hlist_unhashed(&port->rlist))
1662 br_multicast_add_router(br, port);
1665 void br_multicast_enable_port(struct net_bridge_port *port)
1667 struct net_bridge *br = port->br;
1669 spin_lock(&br->multicast_lock);
1670 __br_multicast_enable_port(port);
1671 spin_unlock(&br->multicast_lock);
1674 void br_multicast_disable_port(struct net_bridge_port *port)
1676 struct net_bridge *br = port->br;
1677 struct net_bridge_port_group *pg;
1678 struct hlist_node *n;
1680 spin_lock(&br->multicast_lock);
1681 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1682 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1683 br_multicast_find_del_pg(br, pg);
1685 __del_port_router(port);
1687 del_timer(&port->multicast_router_timer);
1688 del_timer(&port->ip4_own_query.timer);
1689 #if IS_ENABLED(CONFIG_IPV6)
1690 del_timer(&port->ip6_own_query.timer);
1692 spin_unlock(&br->multicast_lock);
1695 static int __grp_src_delete_marked(struct net_bridge_port_group *pg)
1697 struct net_bridge_group_src *ent;
1698 struct hlist_node *tmp;
1701 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
1702 if (ent->flags & BR_SGRP_F_DELETE) {
1703 br_multicast_del_group_src(ent);
1710 static void __grp_src_mod_timer(struct net_bridge_group_src *src,
1711 unsigned long expires)
1713 mod_timer(&src->timer, expires);
1714 br_multicast_fwd_src_handle(src);
1717 static void __grp_src_query_marked_and_rexmit(struct net_bridge_port_group *pg)
1719 struct bridge_mcast_other_query *other_query = NULL;
1720 struct net_bridge *br = pg->key.port->br;
1721 u32 lmqc = br->multicast_last_member_count;
1722 unsigned long lmqt, lmi, now = jiffies;
1723 struct net_bridge_group_src *ent;
1725 if (!netif_running(br->dev) ||
1726 !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1729 if (pg->key.addr.proto == htons(ETH_P_IP))
1730 other_query = &br->ip4_other_query;
1731 #if IS_ENABLED(CONFIG_IPV6)
1733 other_query = &br->ip6_other_query;
1736 lmqt = now + br_multicast_lmqt(br);
1737 hlist_for_each_entry(ent, &pg->src_list, node) {
1738 if (ent->flags & BR_SGRP_F_SEND) {
1739 ent->flags &= ~BR_SGRP_F_SEND;
1740 if (ent->timer.expires > lmqt) {
1741 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) &&
1743 !timer_pending(&other_query->timer))
1744 ent->src_query_rexmit_cnt = lmqc;
1745 __grp_src_mod_timer(ent, lmqt);
1750 if (!br_opt_get(br, BROPT_MULTICAST_QUERIER) ||
1751 !other_query || timer_pending(&other_query->timer))
1754 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1755 &pg->key.addr, true, 1, NULL);
1757 lmi = now + br->multicast_last_member_interval;
1758 if (!timer_pending(&pg->rexmit_timer) ||
1759 time_after(pg->rexmit_timer.expires, lmi))
1760 mod_timer(&pg->rexmit_timer, lmi);
1763 static void __grp_send_query_and_rexmit(struct net_bridge_port_group *pg)
1765 struct bridge_mcast_other_query *other_query = NULL;
1766 struct net_bridge *br = pg->key.port->br;
1767 unsigned long now = jiffies, lmi;
1769 if (!netif_running(br->dev) ||
1770 !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1773 if (pg->key.addr.proto == htons(ETH_P_IP))
1774 other_query = &br->ip4_other_query;
1775 #if IS_ENABLED(CONFIG_IPV6)
1777 other_query = &br->ip6_other_query;
1780 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) &&
1781 other_query && !timer_pending(&other_query->timer)) {
1782 lmi = now + br->multicast_last_member_interval;
1783 pg->grp_query_rexmit_cnt = br->multicast_last_member_count - 1;
1784 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1785 &pg->key.addr, false, 0, NULL);
1786 if (!timer_pending(&pg->rexmit_timer) ||
1787 time_after(pg->rexmit_timer.expires, lmi))
1788 mod_timer(&pg->rexmit_timer, lmi);
1791 if (pg->filter_mode == MCAST_EXCLUDE &&
1792 (!timer_pending(&pg->timer) ||
1793 time_after(pg->timer.expires, now + br_multicast_lmqt(br))))
1794 mod_timer(&pg->timer, now + br_multicast_lmqt(br));
1797 /* State Msg type New state Actions
1798 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI
1799 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI
1800 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI
1802 static bool br_multicast_isinc_allow(struct net_bridge_port_group *pg,
1803 void *srcs, u32 nsrcs, size_t src_size)
1805 struct net_bridge *br = pg->key.port->br;
1806 struct net_bridge_group_src *ent;
1807 unsigned long now = jiffies;
1808 bool changed = false;
1809 struct br_ip src_ip;
1812 memset(&src_ip, 0, sizeof(src_ip));
1813 src_ip.proto = pg->key.addr.proto;
1814 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1815 memcpy(&src_ip.src, srcs, src_size);
1816 ent = br_multicast_find_group_src(pg, &src_ip);
1818 ent = br_multicast_new_group_src(pg, &src_ip);
1824 __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
1831 /* State Msg type New state Actions
1832 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
1836 static void __grp_src_isexc_incl(struct net_bridge_port_group *pg,
1837 void *srcs, u32 nsrcs, size_t src_size)
1839 struct net_bridge_group_src *ent;
1840 struct br_ip src_ip;
1843 hlist_for_each_entry(ent, &pg->src_list, node)
1844 ent->flags |= BR_SGRP_F_DELETE;
1846 memset(&src_ip, 0, sizeof(src_ip));
1847 src_ip.proto = pg->key.addr.proto;
1848 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1849 memcpy(&src_ip.src, srcs, src_size);
1850 ent = br_multicast_find_group_src(pg, &src_ip);
1852 ent->flags &= ~BR_SGRP_F_DELETE;
1854 ent = br_multicast_new_group_src(pg, &src_ip);
1856 br_multicast_fwd_src_handle(ent);
1860 __grp_src_delete_marked(pg);
1863 /* State Msg type New state Actions
1864 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI
1869 static bool __grp_src_isexc_excl(struct net_bridge_port_group *pg,
1870 void *srcs, u32 nsrcs, size_t src_size)
1872 struct net_bridge *br = pg->key.port->br;
1873 struct net_bridge_group_src *ent;
1874 unsigned long now = jiffies;
1875 bool changed = false;
1876 struct br_ip src_ip;
1879 hlist_for_each_entry(ent, &pg->src_list, node)
1880 ent->flags |= BR_SGRP_F_DELETE;
1882 memset(&src_ip, 0, sizeof(src_ip));
1883 src_ip.proto = pg->key.addr.proto;
1884 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1885 memcpy(&src_ip.src, srcs, src_size);
1886 ent = br_multicast_find_group_src(pg, &src_ip);
1888 ent->flags &= ~BR_SGRP_F_DELETE;
1890 ent = br_multicast_new_group_src(pg, &src_ip);
1892 __grp_src_mod_timer(ent,
1893 now + br_multicast_gmi(br));
1900 if (__grp_src_delete_marked(pg))
1906 static bool br_multicast_isexc(struct net_bridge_port_group *pg,
1907 void *srcs, u32 nsrcs, size_t src_size)
1909 struct net_bridge *br = pg->key.port->br;
1910 bool changed = false;
1912 switch (pg->filter_mode) {
1914 __grp_src_isexc_incl(pg, srcs, nsrcs, src_size);
1915 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
1919 changed = __grp_src_isexc_excl(pg, srcs, nsrcs, src_size);
1923 pg->filter_mode = MCAST_EXCLUDE;
1924 mod_timer(&pg->timer, jiffies + br_multicast_gmi(br));
1929 /* State Msg type New state Actions
1930 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI
1933 static bool __grp_src_toin_incl(struct net_bridge_port_group *pg,
1934 void *srcs, u32 nsrcs, size_t src_size)
1936 struct net_bridge *br = pg->key.port->br;
1937 u32 src_idx, to_send = pg->src_ents;
1938 struct net_bridge_group_src *ent;
1939 unsigned long now = jiffies;
1940 bool changed = false;
1941 struct br_ip src_ip;
1943 hlist_for_each_entry(ent, &pg->src_list, node)
1944 ent->flags |= BR_SGRP_F_SEND;
1946 memset(&src_ip, 0, sizeof(src_ip));
1947 src_ip.proto = pg->key.addr.proto;
1948 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1949 memcpy(&src_ip.src, srcs, src_size);
1950 ent = br_multicast_find_group_src(pg, &src_ip);
1952 ent->flags &= ~BR_SGRP_F_SEND;
1955 ent = br_multicast_new_group_src(pg, &src_ip);
1960 __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
1965 __grp_src_query_marked_and_rexmit(pg);
1970 /* State Msg type New state Actions
1971 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI
1975 static bool __grp_src_toin_excl(struct net_bridge_port_group *pg,
1976 void *srcs, u32 nsrcs, size_t src_size)
1978 struct net_bridge *br = pg->key.port->br;
1979 u32 src_idx, to_send = pg->src_ents;
1980 struct net_bridge_group_src *ent;
1981 unsigned long now = jiffies;
1982 bool changed = false;
1983 struct br_ip src_ip;
1985 hlist_for_each_entry(ent, &pg->src_list, node)
1986 if (timer_pending(&ent->timer))
1987 ent->flags |= BR_SGRP_F_SEND;
1989 memset(&src_ip, 0, sizeof(src_ip));
1990 src_ip.proto = pg->key.addr.proto;
1991 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1992 memcpy(&src_ip.src, srcs, src_size);
1993 ent = br_multicast_find_group_src(pg, &src_ip);
1995 if (timer_pending(&ent->timer)) {
1996 ent->flags &= ~BR_SGRP_F_SEND;
2000 ent = br_multicast_new_group_src(pg, &src_ip);
2005 __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
2010 __grp_src_query_marked_and_rexmit(pg);
2012 __grp_send_query_and_rexmit(pg);
2017 static bool br_multicast_toin(struct net_bridge_port_group *pg,
2018 void *srcs, u32 nsrcs, size_t src_size)
2020 bool changed = false;
2022 switch (pg->filter_mode) {
2024 changed = __grp_src_toin_incl(pg, srcs, nsrcs, src_size);
2027 changed = __grp_src_toin_excl(pg, srcs, nsrcs, src_size);
2034 /* State Msg type New state Actions
2035 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
2040 static void __grp_src_toex_incl(struct net_bridge_port_group *pg,
2041 void *srcs, u32 nsrcs, size_t src_size)
2043 struct net_bridge_group_src *ent;
2044 u32 src_idx, to_send = 0;
2045 struct br_ip src_ip;
2047 hlist_for_each_entry(ent, &pg->src_list, node)
2048 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2050 memset(&src_ip, 0, sizeof(src_ip));
2051 src_ip.proto = pg->key.addr.proto;
2052 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2053 memcpy(&src_ip.src, srcs, src_size);
2054 ent = br_multicast_find_group_src(pg, &src_ip);
2056 ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) |
2060 ent = br_multicast_new_group_src(pg, &src_ip);
2063 br_multicast_fwd_src_handle(ent);
2067 __grp_src_delete_marked(pg);
2069 __grp_src_query_marked_and_rexmit(pg);
2072 /* State Msg type New state Actions
2073 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer
2079 static bool __grp_src_toex_excl(struct net_bridge_port_group *pg,
2080 void *srcs, u32 nsrcs, size_t src_size)
2082 struct net_bridge_group_src *ent;
2083 u32 src_idx, to_send = 0;
2084 bool changed = false;
2085 struct br_ip src_ip;
2087 hlist_for_each_entry(ent, &pg->src_list, node)
2088 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2090 memset(&src_ip, 0, sizeof(src_ip));
2091 src_ip.proto = pg->key.addr.proto;
2092 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2093 memcpy(&src_ip.src, srcs, src_size);
2094 ent = br_multicast_find_group_src(pg, &src_ip);
2096 ent->flags &= ~BR_SGRP_F_DELETE;
2098 ent = br_multicast_new_group_src(pg, &src_ip);
2100 __grp_src_mod_timer(ent, pg->timer.expires);
2104 if (ent && timer_pending(&ent->timer)) {
2105 ent->flags |= BR_SGRP_F_SEND;
2111 if (__grp_src_delete_marked(pg))
2114 __grp_src_query_marked_and_rexmit(pg);
2119 static bool br_multicast_toex(struct net_bridge_port_group *pg,
2120 void *srcs, u32 nsrcs, size_t src_size)
2122 struct net_bridge *br = pg->key.port->br;
2123 bool changed = false;
2125 switch (pg->filter_mode) {
2127 __grp_src_toex_incl(pg, srcs, nsrcs, src_size);
2128 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
2132 changed = __grp_src_toex_excl(pg, srcs, nsrcs, src_size);
2136 pg->filter_mode = MCAST_EXCLUDE;
2137 mod_timer(&pg->timer, jiffies + br_multicast_gmi(br));
2142 /* State Msg type New state Actions
2143 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B)
2145 static void __grp_src_block_incl(struct net_bridge_port_group *pg,
2146 void *srcs, u32 nsrcs, size_t src_size)
2148 struct net_bridge_group_src *ent;
2149 u32 src_idx, to_send = 0;
2150 struct br_ip src_ip;
2152 hlist_for_each_entry(ent, &pg->src_list, node)
2153 ent->flags &= ~BR_SGRP_F_SEND;
2155 memset(&src_ip, 0, sizeof(src_ip));
2156 src_ip.proto = pg->key.addr.proto;
2157 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2158 memcpy(&src_ip.src, srcs, src_size);
2159 ent = br_multicast_find_group_src(pg, &src_ip);
2161 ent->flags |= BR_SGRP_F_SEND;
2168 __grp_src_query_marked_and_rexmit(pg);
2170 if (pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list))
2171 br_multicast_find_del_pg(pg->key.port->br, pg);
2174 /* State Msg type New state Actions
2175 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer
2178 static bool __grp_src_block_excl(struct net_bridge_port_group *pg,
2179 void *srcs, u32 nsrcs, size_t src_size)
2181 struct net_bridge_group_src *ent;
2182 u32 src_idx, to_send = 0;
2183 bool changed = false;
2184 struct br_ip src_ip;
2186 hlist_for_each_entry(ent, &pg->src_list, node)
2187 ent->flags &= ~BR_SGRP_F_SEND;
2189 memset(&src_ip, 0, sizeof(src_ip));
2190 src_ip.proto = pg->key.addr.proto;
2191 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2192 memcpy(&src_ip.src, srcs, src_size);
2193 ent = br_multicast_find_group_src(pg, &src_ip);
2195 ent = br_multicast_new_group_src(pg, &src_ip);
2197 __grp_src_mod_timer(ent, pg->timer.expires);
2201 if (ent && timer_pending(&ent->timer)) {
2202 ent->flags |= BR_SGRP_F_SEND;
2209 __grp_src_query_marked_and_rexmit(pg);
2214 static bool br_multicast_block(struct net_bridge_port_group *pg,
2215 void *srcs, u32 nsrcs, size_t src_size)
2217 bool changed = false;
2219 switch (pg->filter_mode) {
2221 __grp_src_block_incl(pg, srcs, nsrcs, src_size);
2224 changed = __grp_src_block_excl(pg, srcs, nsrcs, src_size);
2231 static struct net_bridge_port_group *
2232 br_multicast_find_port(struct net_bridge_mdb_entry *mp,
2233 struct net_bridge_port *p,
2234 const unsigned char *src)
2236 struct net_bridge *br __maybe_unused = mp->br;
2237 struct net_bridge_port_group *pg;
2239 for (pg = mlock_dereference(mp->ports, br);
2241 pg = mlock_dereference(pg->next, br))
2242 if (br_port_group_equal(pg, p, src))
2248 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
2249 struct net_bridge_port *port,
2250 struct sk_buff *skb,
2253 bool igmpv2 = br->multicast_igmp_version == 2;
2254 struct net_bridge_mdb_entry *mdst;
2255 struct net_bridge_port_group *pg;
2256 const unsigned char *src;
2257 struct igmpv3_report *ih;
2258 struct igmpv3_grec *grec;
2259 int i, len, num, type;
2260 bool changed = false;
2265 ih = igmpv3_report_hdr(skb);
2266 num = ntohs(ih->ngrec);
2267 len = skb_transport_offset(skb) + sizeof(*ih);
2269 for (i = 0; i < num; i++) {
2270 len += sizeof(*grec);
2271 if (!ip_mc_may_pull(skb, len))
2274 grec = (void *)(skb->data + len - sizeof(*grec));
2275 group = grec->grec_mca;
2276 type = grec->grec_type;
2277 nsrcs = ntohs(grec->grec_nsrcs);
2280 if (!ip_mc_may_pull(skb, len))
2284 case IGMPV3_MODE_IS_INCLUDE:
2285 case IGMPV3_MODE_IS_EXCLUDE:
2286 case IGMPV3_CHANGE_TO_INCLUDE:
2287 case IGMPV3_CHANGE_TO_EXCLUDE:
2288 case IGMPV3_ALLOW_NEW_SOURCES:
2289 case IGMPV3_BLOCK_OLD_SOURCES:
2296 src = eth_hdr(skb)->h_source;
2298 (type == IGMPV3_CHANGE_TO_INCLUDE ||
2299 type == IGMPV3_MODE_IS_INCLUDE)) {
2300 if (!port || igmpv2) {
2301 br_ip4_multicast_leave_group(br, port, group, vid, src);
2305 err = br_ip4_multicast_add_group(br, port, group, vid,
2311 if (!port || igmpv2)
2314 spin_lock_bh(&br->multicast_lock);
2315 mdst = br_mdb_ip4_get(br, group, vid);
2317 goto unlock_continue;
2318 pg = br_multicast_find_port(mdst, port, src);
2319 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2320 goto unlock_continue;
2322 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4));
2324 case IGMPV3_ALLOW_NEW_SOURCES:
2325 changed = br_multicast_isinc_allow(pg, grec->grec_src,
2326 nsrcs, sizeof(__be32));
2328 case IGMPV3_MODE_IS_INCLUDE:
2329 changed = br_multicast_isinc_allow(pg, grec->grec_src, nsrcs,
2332 case IGMPV3_MODE_IS_EXCLUDE:
2333 changed = br_multicast_isexc(pg, grec->grec_src, nsrcs,
2336 case IGMPV3_CHANGE_TO_INCLUDE:
2337 changed = br_multicast_toin(pg, grec->grec_src, nsrcs,
2340 case IGMPV3_CHANGE_TO_EXCLUDE:
2341 changed = br_multicast_toex(pg, grec->grec_src, nsrcs,
2344 case IGMPV3_BLOCK_OLD_SOURCES:
2345 changed = br_multicast_block(pg, grec->grec_src, nsrcs,
2350 br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB);
2352 spin_unlock_bh(&br->multicast_lock);
2358 #if IS_ENABLED(CONFIG_IPV6)
2359 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
2360 struct net_bridge_port *port,
2361 struct sk_buff *skb,
2364 bool mldv1 = br->multicast_mld_version == 1;
2365 struct net_bridge_mdb_entry *mdst;
2366 struct net_bridge_port_group *pg;
2367 unsigned int nsrcs_offset;
2368 const unsigned char *src;
2369 struct icmp6hdr *icmp6h;
2370 struct mld2_grec *grec;
2371 unsigned int grec_len;
2372 bool changed = false;
2376 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
2379 icmp6h = icmp6_hdr(skb);
2380 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
2381 len = skb_transport_offset(skb) + sizeof(*icmp6h);
2383 for (i = 0; i < num; i++) {
2384 __be16 *_nsrcs, __nsrcs;
2387 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
2389 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
2390 nsrcs_offset + sizeof(__nsrcs))
2393 _nsrcs = skb_header_pointer(skb, nsrcs_offset,
2394 sizeof(__nsrcs), &__nsrcs);
2398 nsrcs = ntohs(*_nsrcs);
2399 grec_len = struct_size(grec, grec_src, nsrcs);
2401 if (!ipv6_mc_may_pull(skb, len + grec_len))
2404 grec = (struct mld2_grec *)(skb->data + len);
2407 switch (grec->grec_type) {
2408 case MLD2_MODE_IS_INCLUDE:
2409 case MLD2_MODE_IS_EXCLUDE:
2410 case MLD2_CHANGE_TO_INCLUDE:
2411 case MLD2_CHANGE_TO_EXCLUDE:
2412 case MLD2_ALLOW_NEW_SOURCES:
2413 case MLD2_BLOCK_OLD_SOURCES:
2420 src = eth_hdr(skb)->h_source;
2421 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
2422 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
2424 if (!port || mldv1) {
2425 br_ip6_multicast_leave_group(br, port,
2431 err = br_ip6_multicast_add_group(br, port,
2432 &grec->grec_mca, vid,
2441 spin_lock_bh(&br->multicast_lock);
2442 mdst = br_mdb_ip6_get(br, &grec->grec_mca, vid);
2444 goto unlock_continue;
2445 pg = br_multicast_find_port(mdst, port, src);
2446 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2447 goto unlock_continue;
2448 switch (grec->grec_type) {
2449 case MLD2_ALLOW_NEW_SOURCES:
2450 changed = br_multicast_isinc_allow(pg, grec->grec_src,
2452 sizeof(struct in6_addr));
2454 case MLD2_MODE_IS_INCLUDE:
2455 changed = br_multicast_isinc_allow(pg, grec->grec_src, nsrcs,
2456 sizeof(struct in6_addr));
2458 case MLD2_MODE_IS_EXCLUDE:
2459 changed = br_multicast_isexc(pg, grec->grec_src, nsrcs,
2460 sizeof(struct in6_addr));
2462 case MLD2_CHANGE_TO_INCLUDE:
2463 changed = br_multicast_toin(pg, grec->grec_src, nsrcs,
2464 sizeof(struct in6_addr));
2466 case MLD2_CHANGE_TO_EXCLUDE:
2467 changed = br_multicast_toex(pg, grec->grec_src, nsrcs,
2468 sizeof(struct in6_addr));
2470 case MLD2_BLOCK_OLD_SOURCES:
2471 changed = br_multicast_block(pg, grec->grec_src, nsrcs,
2472 sizeof(struct in6_addr));
2476 br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB);
2478 spin_unlock_bh(&br->multicast_lock);
2485 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
2486 struct net_bridge_port *port,
2489 if (!timer_pending(&br->ip4_own_query.timer) &&
2490 !timer_pending(&br->ip4_other_query.timer))
2493 if (!br->ip4_querier.addr.src.ip4)
2496 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.src.ip4))
2502 br->ip4_querier.addr.src.ip4 = saddr;
2504 /* update protected by general multicast_lock by caller */
2505 rcu_assign_pointer(br->ip4_querier.port, port);
2510 #if IS_ENABLED(CONFIG_IPV6)
2511 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
2512 struct net_bridge_port *port,
2513 struct in6_addr *saddr)
2515 if (!timer_pending(&br->ip6_own_query.timer) &&
2516 !timer_pending(&br->ip6_other_query.timer))
2519 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.src.ip6) <= 0)
2525 br->ip6_querier.addr.src.ip6 = *saddr;
2527 /* update protected by general multicast_lock by caller */
2528 rcu_assign_pointer(br->ip6_querier.port, port);
2534 static bool br_multicast_select_querier(struct net_bridge *br,
2535 struct net_bridge_port *port,
2536 struct br_ip *saddr)
2538 switch (saddr->proto) {
2539 case htons(ETH_P_IP):
2540 return br_ip4_multicast_select_querier(br, port, saddr->src.ip4);
2541 #if IS_ENABLED(CONFIG_IPV6)
2542 case htons(ETH_P_IPV6):
2543 return br_ip6_multicast_select_querier(br, port, &saddr->src.ip6);
2551 br_multicast_update_query_timer(struct net_bridge *br,
2552 struct bridge_mcast_other_query *query,
2553 unsigned long max_delay)
2555 if (!timer_pending(&query->timer))
2556 query->delay_time = jiffies + max_delay;
2558 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
2561 static void br_port_mc_router_state_change(struct net_bridge_port *p,
2564 struct switchdev_attr attr = {
2566 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
2567 .flags = SWITCHDEV_F_DEFER,
2568 .u.mrouter = is_mc_router,
2571 switchdev_port_attr_set(p->dev, &attr);
2575 * Add port to router_list
2576 * list is maintained ordered by pointer value
2577 * and locked by br->multicast_lock and RCU
2579 static void br_multicast_add_router(struct net_bridge *br,
2580 struct net_bridge_port *port)
2582 struct net_bridge_port *p;
2583 struct hlist_node *slot = NULL;
2585 if (!hlist_unhashed(&port->rlist))
2588 hlist_for_each_entry(p, &br->router_list, rlist) {
2589 if ((unsigned long) port >= (unsigned long) p)
2595 hlist_add_behind_rcu(&port->rlist, slot);
2597 hlist_add_head_rcu(&port->rlist, &br->router_list);
2598 br_rtr_notify(br->dev, port, RTM_NEWMDB);
2599 br_port_mc_router_state_change(port, true);
2602 static void br_multicast_mark_router(struct net_bridge *br,
2603 struct net_bridge_port *port)
2605 unsigned long now = jiffies;
2608 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
2609 if (!timer_pending(&br->multicast_router_timer))
2610 br_mc_router_state_change(br, true);
2611 mod_timer(&br->multicast_router_timer,
2612 now + br->multicast_querier_interval);
2617 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
2618 port->multicast_router == MDB_RTR_TYPE_PERM)
2621 br_multicast_add_router(br, port);
2623 mod_timer(&port->multicast_router_timer,
2624 now + br->multicast_querier_interval);
2627 static void br_multicast_query_received(struct net_bridge *br,
2628 struct net_bridge_port *port,
2629 struct bridge_mcast_other_query *query,
2630 struct br_ip *saddr,
2631 unsigned long max_delay)
2633 if (!br_multicast_select_querier(br, port, saddr))
2636 br_multicast_update_query_timer(br, query, max_delay);
2637 br_multicast_mark_router(br, port);
2640 static void br_ip4_multicast_query(struct net_bridge *br,
2641 struct net_bridge_port *port,
2642 struct sk_buff *skb,
2645 unsigned int transport_len = ip_transport_len(skb);
2646 const struct iphdr *iph = ip_hdr(skb);
2647 struct igmphdr *ih = igmp_hdr(skb);
2648 struct net_bridge_mdb_entry *mp;
2649 struct igmpv3_query *ih3;
2650 struct net_bridge_port_group *p;
2651 struct net_bridge_port_group __rcu **pp;
2653 unsigned long max_delay;
2654 unsigned long now = jiffies;
2657 spin_lock(&br->multicast_lock);
2658 if (!netif_running(br->dev) ||
2659 (port && port->state == BR_STATE_DISABLED))
2664 if (transport_len == sizeof(*ih)) {
2665 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
2668 max_delay = 10 * HZ;
2671 } else if (transport_len >= sizeof(*ih3)) {
2672 ih3 = igmpv3_query_hdr(skb);
2674 (br->multicast_igmp_version == 3 && group && ih3->suppress))
2677 max_delay = ih3->code ?
2678 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
2684 saddr.proto = htons(ETH_P_IP);
2685 saddr.src.ip4 = iph->saddr;
2687 br_multicast_query_received(br, port, &br->ip4_other_query,
2692 mp = br_mdb_ip4_get(br, group, vid);
2696 max_delay *= br->multicast_last_member_count;
2698 if (mp->host_joined &&
2699 (timer_pending(&mp->timer) ?
2700 time_after(mp->timer.expires, now + max_delay) :
2701 try_to_del_timer_sync(&mp->timer) >= 0))
2702 mod_timer(&mp->timer, now + max_delay);
2704 for (pp = &mp->ports;
2705 (p = mlock_dereference(*pp, br)) != NULL;
2707 if (timer_pending(&p->timer) ?
2708 time_after(p->timer.expires, now + max_delay) :
2709 try_to_del_timer_sync(&p->timer) >= 0 &&
2710 (br->multicast_igmp_version == 2 ||
2711 p->filter_mode == MCAST_EXCLUDE))
2712 mod_timer(&p->timer, now + max_delay);
2716 spin_unlock(&br->multicast_lock);
2719 #if IS_ENABLED(CONFIG_IPV6)
2720 static int br_ip6_multicast_query(struct net_bridge *br,
2721 struct net_bridge_port *port,
2722 struct sk_buff *skb,
2725 unsigned int transport_len = ipv6_transport_len(skb);
2726 struct mld_msg *mld;
2727 struct net_bridge_mdb_entry *mp;
2728 struct mld2_query *mld2q;
2729 struct net_bridge_port_group *p;
2730 struct net_bridge_port_group __rcu **pp;
2732 unsigned long max_delay;
2733 unsigned long now = jiffies;
2734 unsigned int offset = skb_transport_offset(skb);
2735 const struct in6_addr *group = NULL;
2736 bool is_general_query;
2739 spin_lock(&br->multicast_lock);
2740 if (!netif_running(br->dev) ||
2741 (port && port->state == BR_STATE_DISABLED))
2744 if (transport_len == sizeof(*mld)) {
2745 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
2749 mld = (struct mld_msg *) icmp6_hdr(skb);
2750 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
2752 group = &mld->mld_mca;
2754 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
2758 mld2q = (struct mld2_query *)icmp6_hdr(skb);
2759 if (!mld2q->mld2q_nsrcs)
2760 group = &mld2q->mld2q_mca;
2761 if (br->multicast_mld_version == 2 &&
2762 !ipv6_addr_any(&mld2q->mld2q_mca) &&
2763 mld2q->mld2q_suppress)
2766 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
2769 is_general_query = group && ipv6_addr_any(group);
2771 if (is_general_query) {
2772 saddr.proto = htons(ETH_P_IPV6);
2773 saddr.src.ip6 = ipv6_hdr(skb)->saddr;
2775 br_multicast_query_received(br, port, &br->ip6_other_query,
2778 } else if (!group) {
2782 mp = br_mdb_ip6_get(br, group, vid);
2786 max_delay *= br->multicast_last_member_count;
2787 if (mp->host_joined &&
2788 (timer_pending(&mp->timer) ?
2789 time_after(mp->timer.expires, now + max_delay) :
2790 try_to_del_timer_sync(&mp->timer) >= 0))
2791 mod_timer(&mp->timer, now + max_delay);
2793 for (pp = &mp->ports;
2794 (p = mlock_dereference(*pp, br)) != NULL;
2796 if (timer_pending(&p->timer) ?
2797 time_after(p->timer.expires, now + max_delay) :
2798 try_to_del_timer_sync(&p->timer) >= 0 &&
2799 (br->multicast_mld_version == 1 ||
2800 p->filter_mode == MCAST_EXCLUDE))
2801 mod_timer(&p->timer, now + max_delay);
2805 spin_unlock(&br->multicast_lock);
2811 br_multicast_leave_group(struct net_bridge *br,
2812 struct net_bridge_port *port,
2813 struct br_ip *group,
2814 struct bridge_mcast_other_query *other_query,
2815 struct bridge_mcast_own_query *own_query,
2816 const unsigned char *src)
2818 struct net_bridge_mdb_entry *mp;
2819 struct net_bridge_port_group *p;
2823 spin_lock(&br->multicast_lock);
2824 if (!netif_running(br->dev) ||
2825 (port && port->state == BR_STATE_DISABLED))
2828 mp = br_mdb_ip_get(br, group);
2832 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
2833 struct net_bridge_port_group __rcu **pp;
2835 for (pp = &mp->ports;
2836 (p = mlock_dereference(*pp, br)) != NULL;
2838 if (!br_port_group_equal(p, port, src))
2841 if (p->flags & MDB_PG_FLAGS_PERMANENT)
2844 p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
2845 br_multicast_del_pg(mp, p, pp);
2850 if (timer_pending(&other_query->timer))
2853 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
2854 __br_multicast_send_query(br, port, NULL, NULL, &mp->addr,
2857 time = jiffies + br->multicast_last_member_count *
2858 br->multicast_last_member_interval;
2860 mod_timer(&own_query->timer, time);
2862 for (p = mlock_dereference(mp->ports, br);
2864 p = mlock_dereference(p->next, br)) {
2865 if (!br_port_group_equal(p, port, src))
2868 if (!hlist_unhashed(&p->mglist) &&
2869 (timer_pending(&p->timer) ?
2870 time_after(p->timer.expires, time) :
2871 try_to_del_timer_sync(&p->timer) >= 0)) {
2872 mod_timer(&p->timer, time);
2880 time = now + br->multicast_last_member_count *
2881 br->multicast_last_member_interval;
2884 if (mp->host_joined &&
2885 (timer_pending(&mp->timer) ?
2886 time_after(mp->timer.expires, time) :
2887 try_to_del_timer_sync(&mp->timer) >= 0)) {
2888 mod_timer(&mp->timer, time);
2894 for (p = mlock_dereference(mp->ports, br);
2896 p = mlock_dereference(p->next, br)) {
2897 if (p->key.port != port)
2900 if (!hlist_unhashed(&p->mglist) &&
2901 (timer_pending(&p->timer) ?
2902 time_after(p->timer.expires, time) :
2903 try_to_del_timer_sync(&p->timer) >= 0)) {
2904 mod_timer(&p->timer, time);
2910 spin_unlock(&br->multicast_lock);
2913 static void br_ip4_multicast_leave_group(struct net_bridge *br,
2914 struct net_bridge_port *port,
2917 const unsigned char *src)
2919 struct br_ip br_group;
2920 struct bridge_mcast_own_query *own_query;
2922 if (ipv4_is_local_multicast(group))
2925 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
2927 memset(&br_group, 0, sizeof(br_group));
2928 br_group.dst.ip4 = group;
2929 br_group.proto = htons(ETH_P_IP);
2932 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
2936 #if IS_ENABLED(CONFIG_IPV6)
2937 static void br_ip6_multicast_leave_group(struct net_bridge *br,
2938 struct net_bridge_port *port,
2939 const struct in6_addr *group,
2941 const unsigned char *src)
2943 struct br_ip br_group;
2944 struct bridge_mcast_own_query *own_query;
2946 if (ipv6_addr_is_ll_all_nodes(group))
2949 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
2951 memset(&br_group, 0, sizeof(br_group));
2952 br_group.dst.ip6 = *group;
2953 br_group.proto = htons(ETH_P_IPV6);
2956 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
2961 static void br_multicast_err_count(const struct net_bridge *br,
2962 const struct net_bridge_port *p,
2965 struct bridge_mcast_stats __percpu *stats;
2966 struct bridge_mcast_stats *pstats;
2968 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2972 stats = p->mcast_stats;
2974 stats = br->mcast_stats;
2975 if (WARN_ON(!stats))
2978 pstats = this_cpu_ptr(stats);
2980 u64_stats_update_begin(&pstats->syncp);
2982 case htons(ETH_P_IP):
2983 pstats->mstats.igmp_parse_errors++;
2985 #if IS_ENABLED(CONFIG_IPV6)
2986 case htons(ETH_P_IPV6):
2987 pstats->mstats.mld_parse_errors++;
2991 u64_stats_update_end(&pstats->syncp);
2994 static void br_multicast_pim(struct net_bridge *br,
2995 struct net_bridge_port *port,
2996 const struct sk_buff *skb)
2998 unsigned int offset = skb_transport_offset(skb);
2999 struct pimhdr *pimhdr, _pimhdr;
3001 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
3002 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
3003 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
3006 br_multicast_mark_router(br, port);
3009 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
3010 struct net_bridge_port *port,
3011 struct sk_buff *skb)
3013 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
3014 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
3017 br_multicast_mark_router(br, port);
3022 static int br_multicast_ipv4_rcv(struct net_bridge *br,
3023 struct net_bridge_port *port,
3024 struct sk_buff *skb,
3027 const unsigned char *src;
3031 err = ip_mc_check_igmp(skb);
3033 if (err == -ENOMSG) {
3034 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
3035 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3036 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
3037 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
3038 br_multicast_pim(br, port, skb);
3039 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
3040 br_ip4_multicast_mrd_rcv(br, port, skb);
3044 } else if (err < 0) {
3045 br_multicast_err_count(br, port, skb->protocol);
3050 src = eth_hdr(skb)->h_source;
3051 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
3054 case IGMP_HOST_MEMBERSHIP_REPORT:
3055 case IGMPV2_HOST_MEMBERSHIP_REPORT:
3056 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3057 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src,
3060 case IGMPV3_HOST_MEMBERSHIP_REPORT:
3061 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
3063 case IGMP_HOST_MEMBERSHIP_QUERY:
3064 br_ip4_multicast_query(br, port, skb, vid);
3066 case IGMP_HOST_LEAVE_MESSAGE:
3067 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
3071 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
3077 #if IS_ENABLED(CONFIG_IPV6)
3078 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
3079 struct net_bridge_port *port,
3080 struct sk_buff *skb)
3084 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
3087 ret = ipv6_mc_check_icmpv6(skb);
3091 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
3094 br_multicast_mark_router(br, port);
3099 static int br_multicast_ipv6_rcv(struct net_bridge *br,
3100 struct net_bridge_port *port,
3101 struct sk_buff *skb,
3104 const unsigned char *src;
3105 struct mld_msg *mld;
3108 err = ipv6_mc_check_mld(skb);
3110 if (err == -ENOMSG) {
3111 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
3112 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3114 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
3115 err = br_ip6_multicast_mrd_rcv(br, port, skb);
3117 if (err < 0 && err != -ENOMSG) {
3118 br_multicast_err_count(br, port, skb->protocol);
3124 } else if (err < 0) {
3125 br_multicast_err_count(br, port, skb->protocol);
3129 mld = (struct mld_msg *)skb_transport_header(skb);
3130 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
3132 switch (mld->mld_type) {
3133 case ICMPV6_MGM_REPORT:
3134 src = eth_hdr(skb)->h_source;
3135 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3136 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
3139 case ICMPV6_MLD2_REPORT:
3140 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
3142 case ICMPV6_MGM_QUERY:
3143 err = br_ip6_multicast_query(br, port, skb, vid);
3145 case ICMPV6_MGM_REDUCTION:
3146 src = eth_hdr(skb)->h_source;
3147 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
3151 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
3158 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
3159 struct sk_buff *skb, u16 vid)
3163 BR_INPUT_SKB_CB(skb)->igmp = 0;
3164 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
3166 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
3169 switch (skb->protocol) {
3170 case htons(ETH_P_IP):
3171 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
3173 #if IS_ENABLED(CONFIG_IPV6)
3174 case htons(ETH_P_IPV6):
3175 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
3183 static void br_multicast_query_expired(struct net_bridge *br,
3184 struct bridge_mcast_own_query *query,
3185 struct bridge_mcast_querier *querier)
3187 spin_lock(&br->multicast_lock);
3188 if (query->startup_sent < br->multicast_startup_query_count)
3189 query->startup_sent++;
3191 RCU_INIT_POINTER(querier->port, NULL);
3192 br_multicast_send_query(br, NULL, query);
3193 spin_unlock(&br->multicast_lock);
3196 static void br_ip4_multicast_query_expired(struct timer_list *t)
3198 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
3200 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
3203 #if IS_ENABLED(CONFIG_IPV6)
3204 static void br_ip6_multicast_query_expired(struct timer_list *t)
3206 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
3208 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
3212 static void br_multicast_gc_work(struct work_struct *work)
3214 struct net_bridge *br = container_of(work, struct net_bridge,
3216 HLIST_HEAD(deleted_head);
3218 spin_lock_bh(&br->multicast_lock);
3219 hlist_move_list(&br->mcast_gc_list, &deleted_head);
3220 spin_unlock_bh(&br->multicast_lock);
3222 br_multicast_gc(&deleted_head);
3225 void br_multicast_init(struct net_bridge *br)
3227 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
3229 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
3230 br->multicast_last_member_count = 2;
3231 br->multicast_startup_query_count = 2;
3233 br->multicast_last_member_interval = HZ;
3234 br->multicast_query_response_interval = 10 * HZ;
3235 br->multicast_startup_query_interval = 125 * HZ / 4;
3236 br->multicast_query_interval = 125 * HZ;
3237 br->multicast_querier_interval = 255 * HZ;
3238 br->multicast_membership_interval = 260 * HZ;
3240 br->ip4_other_query.delay_time = 0;
3241 br->ip4_querier.port = NULL;
3242 br->multicast_igmp_version = 2;
3243 #if IS_ENABLED(CONFIG_IPV6)
3244 br->multicast_mld_version = 1;
3245 br->ip6_other_query.delay_time = 0;
3246 br->ip6_querier.port = NULL;
3248 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
3249 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
3251 spin_lock_init(&br->multicast_lock);
3252 timer_setup(&br->multicast_router_timer,
3253 br_multicast_local_router_expired, 0);
3254 timer_setup(&br->ip4_other_query.timer,
3255 br_ip4_multicast_querier_expired, 0);
3256 timer_setup(&br->ip4_own_query.timer,
3257 br_ip4_multicast_query_expired, 0);
3258 #if IS_ENABLED(CONFIG_IPV6)
3259 timer_setup(&br->ip6_other_query.timer,
3260 br_ip6_multicast_querier_expired, 0);
3261 timer_setup(&br->ip6_own_query.timer,
3262 br_ip6_multicast_query_expired, 0);
3264 INIT_HLIST_HEAD(&br->mdb_list);
3265 INIT_HLIST_HEAD(&br->mcast_gc_list);
3266 INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work);
3269 static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
3271 struct in_device *in_dev = in_dev_get(br->dev);
3276 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
3280 #if IS_ENABLED(CONFIG_IPV6)
3281 static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
3283 struct in6_addr addr;
3285 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
3286 ipv6_dev_mc_inc(br->dev, &addr);
3289 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
3294 void br_multicast_join_snoopers(struct net_bridge *br)
3296 br_ip4_multicast_join_snoopers(br);
3297 br_ip6_multicast_join_snoopers(br);
3300 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
3302 struct in_device *in_dev = in_dev_get(br->dev);
3304 if (WARN_ON(!in_dev))
3307 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
3311 #if IS_ENABLED(CONFIG_IPV6)
3312 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
3314 struct in6_addr addr;
3316 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
3317 ipv6_dev_mc_dec(br->dev, &addr);
3320 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
3325 void br_multicast_leave_snoopers(struct net_bridge *br)
3327 br_ip4_multicast_leave_snoopers(br);
3328 br_ip6_multicast_leave_snoopers(br);
3331 static void __br_multicast_open(struct net_bridge *br,
3332 struct bridge_mcast_own_query *query)
3334 query->startup_sent = 0;
3336 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
3339 mod_timer(&query->timer, jiffies);
3342 void br_multicast_open(struct net_bridge *br)
3344 __br_multicast_open(br, &br->ip4_own_query);
3345 #if IS_ENABLED(CONFIG_IPV6)
3346 __br_multicast_open(br, &br->ip6_own_query);
3350 void br_multicast_stop(struct net_bridge *br)
3352 del_timer_sync(&br->multicast_router_timer);
3353 del_timer_sync(&br->ip4_other_query.timer);
3354 del_timer_sync(&br->ip4_own_query.timer);
3355 #if IS_ENABLED(CONFIG_IPV6)
3356 del_timer_sync(&br->ip6_other_query.timer);
3357 del_timer_sync(&br->ip6_own_query.timer);
3361 void br_multicast_dev_del(struct net_bridge *br)
3363 struct net_bridge_mdb_entry *mp;
3364 HLIST_HEAD(deleted_head);
3365 struct hlist_node *tmp;
3367 spin_lock_bh(&br->multicast_lock);
3368 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node)
3369 br_multicast_del_mdb_entry(mp);
3370 hlist_move_list(&br->mcast_gc_list, &deleted_head);
3371 spin_unlock_bh(&br->multicast_lock);
3373 br_multicast_gc(&deleted_head);
3374 cancel_work_sync(&br->mcast_gc_work);
3379 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
3383 spin_lock_bh(&br->multicast_lock);
3386 case MDB_RTR_TYPE_DISABLED:
3387 case MDB_RTR_TYPE_PERM:
3388 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
3389 del_timer(&br->multicast_router_timer);
3390 br->multicast_router = val;
3393 case MDB_RTR_TYPE_TEMP_QUERY:
3394 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
3395 br_mc_router_state_change(br, false);
3396 br->multicast_router = val;
3401 spin_unlock_bh(&br->multicast_lock);
3406 static void __del_port_router(struct net_bridge_port *p)
3408 if (hlist_unhashed(&p->rlist))
3410 hlist_del_init_rcu(&p->rlist);
3411 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
3412 br_port_mc_router_state_change(p, false);
3414 /* don't allow timer refresh */
3415 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
3416 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
3419 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
3421 struct net_bridge *br = p->br;
3422 unsigned long now = jiffies;
3425 spin_lock(&br->multicast_lock);
3426 if (p->multicast_router == val) {
3427 /* Refresh the temp router port timer */
3428 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
3429 mod_timer(&p->multicast_router_timer,
3430 now + br->multicast_querier_interval);
3435 case MDB_RTR_TYPE_DISABLED:
3436 p->multicast_router = MDB_RTR_TYPE_DISABLED;
3437 __del_port_router(p);
3438 del_timer(&p->multicast_router_timer);
3440 case MDB_RTR_TYPE_TEMP_QUERY:
3441 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
3442 __del_port_router(p);
3444 case MDB_RTR_TYPE_PERM:
3445 p->multicast_router = MDB_RTR_TYPE_PERM;
3446 del_timer(&p->multicast_router_timer);
3447 br_multicast_add_router(br, p);
3449 case MDB_RTR_TYPE_TEMP:
3450 p->multicast_router = MDB_RTR_TYPE_TEMP;
3451 br_multicast_mark_router(br, p);
3458 spin_unlock(&br->multicast_lock);
3463 static void br_multicast_start_querier(struct net_bridge *br,
3464 struct bridge_mcast_own_query *query)
3466 struct net_bridge_port *port;
3468 __br_multicast_open(br, query);
3471 list_for_each_entry_rcu(port, &br->port_list, list) {
3472 if (port->state == BR_STATE_DISABLED ||
3473 port->state == BR_STATE_BLOCKING)
3476 if (query == &br->ip4_own_query)
3477 br_multicast_enable(&port->ip4_own_query);
3478 #if IS_ENABLED(CONFIG_IPV6)
3480 br_multicast_enable(&port->ip6_own_query);
3486 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
3488 struct net_bridge_port *port;
3489 bool change_snoopers = false;
3491 spin_lock_bh(&br->multicast_lock);
3492 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
3495 br_mc_disabled_update(br->dev, val);
3496 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
3497 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
3498 change_snoopers = true;
3502 if (!netif_running(br->dev))
3505 br_multicast_open(br);
3506 list_for_each_entry(port, &br->port_list, list)
3507 __br_multicast_enable_port(port);
3509 change_snoopers = true;
3512 spin_unlock_bh(&br->multicast_lock);
3514 /* br_multicast_join_snoopers has the potential to cause
3515 * an MLD Report/Leave to be delivered to br_multicast_rcv,
3516 * which would in turn call br_multicast_add_group, which would
3517 * attempt to acquire multicast_lock. This function should be
3518 * called after the lock has been released to avoid deadlocks on
3521 * br_multicast_leave_snoopers does not have the problem since
3522 * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and
3523 * returns without calling br_multicast_ipv4/6_rcv if it's not
3524 * enabled. Moved both functions out just for symmetry.
3526 if (change_snoopers) {
3527 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
3528 br_multicast_join_snoopers(br);
3530 br_multicast_leave_snoopers(br);
3536 bool br_multicast_enabled(const struct net_device *dev)
3538 struct net_bridge *br = netdev_priv(dev);
3540 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
3542 EXPORT_SYMBOL_GPL(br_multicast_enabled);
3544 bool br_multicast_router(const struct net_device *dev)
3546 struct net_bridge *br = netdev_priv(dev);
3549 spin_lock_bh(&br->multicast_lock);
3550 is_router = br_multicast_is_router(br);
3551 spin_unlock_bh(&br->multicast_lock);
3554 EXPORT_SYMBOL_GPL(br_multicast_router);
3556 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
3558 unsigned long max_delay;
3562 spin_lock_bh(&br->multicast_lock);
3563 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
3566 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
3570 max_delay = br->multicast_query_response_interval;
3572 if (!timer_pending(&br->ip4_other_query.timer))
3573 br->ip4_other_query.delay_time = jiffies + max_delay;
3575 br_multicast_start_querier(br, &br->ip4_own_query);
3577 #if IS_ENABLED(CONFIG_IPV6)
3578 if (!timer_pending(&br->ip6_other_query.timer))
3579 br->ip6_other_query.delay_time = jiffies + max_delay;
3581 br_multicast_start_querier(br, &br->ip6_own_query);
3585 spin_unlock_bh(&br->multicast_lock);
3590 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
3592 /* Currently we support only version 2 and 3 */
3601 spin_lock_bh(&br->multicast_lock);
3602 br->multicast_igmp_version = val;
3603 spin_unlock_bh(&br->multicast_lock);
3608 #if IS_ENABLED(CONFIG_IPV6)
3609 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
3611 /* Currently we support version 1 and 2 */
3620 spin_lock_bh(&br->multicast_lock);
3621 br->multicast_mld_version = val;
3622 spin_unlock_bh(&br->multicast_lock);
3629 * br_multicast_list_adjacent - Returns snooped multicast addresses
3630 * @dev: The bridge port adjacent to which to retrieve addresses
3631 * @br_ip_list: The list to store found, snooped multicast IP addresses in
3633 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
3634 * snooping feature on all bridge ports of dev's bridge device, excluding
3635 * the addresses from dev itself.
3637 * Returns the number of items added to br_ip_list.
3640 * - br_ip_list needs to be initialized by caller
3641 * - br_ip_list might contain duplicates in the end
3642 * (needs to be taken care of by caller)
3643 * - br_ip_list needs to be freed by caller
3645 int br_multicast_list_adjacent(struct net_device *dev,
3646 struct list_head *br_ip_list)
3648 struct net_bridge *br;
3649 struct net_bridge_port *port;
3650 struct net_bridge_port_group *group;
3651 struct br_ip_list *entry;
3655 if (!br_ip_list || !netif_is_bridge_port(dev))
3658 port = br_port_get_rcu(dev);
3659 if (!port || !port->br)
3664 list_for_each_entry_rcu(port, &br->port_list, list) {
3665 if (!port->dev || port->dev == dev)
3668 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
3669 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
3673 entry->addr = group->key.addr;
3674 list_add(&entry->list, br_ip_list);
3683 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
3686 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
3687 * @dev: The bridge port providing the bridge on which to check for a querier
3688 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
3690 * Checks whether the given interface has a bridge on top and if so returns
3691 * true if a valid querier exists anywhere on the bridged link layer.
3692 * Otherwise returns false.
3694 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
3696 struct net_bridge *br;
3697 struct net_bridge_port *port;
3702 if (!netif_is_bridge_port(dev))
3705 port = br_port_get_rcu(dev);
3706 if (!port || !port->br)
3711 memset(ð, 0, sizeof(eth));
3712 eth.h_proto = htons(proto);
3714 ret = br_multicast_querier_exists(br, ð, NULL);
3720 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
3723 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
3724 * @dev: The bridge port adjacent to which to check for a querier
3725 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
3727 * Checks whether the given interface has a bridge on top and if so returns
3728 * true if a selected querier is behind one of the other ports of this
3729 * bridge. Otherwise returns false.
3731 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
3733 struct net_bridge *br;
3734 struct net_bridge_port *port;
3738 if (!netif_is_bridge_port(dev))
3741 port = br_port_get_rcu(dev);
3742 if (!port || !port->br)
3749 if (!timer_pending(&br->ip4_other_query.timer) ||
3750 rcu_dereference(br->ip4_querier.port) == port)
3753 #if IS_ENABLED(CONFIG_IPV6)
3755 if (!timer_pending(&br->ip6_other_query.timer) ||
3756 rcu_dereference(br->ip6_querier.port) == port)
3769 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
3771 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
3772 const struct sk_buff *skb, u8 type, u8 dir)
3774 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
3775 __be16 proto = skb->protocol;
3778 u64_stats_update_begin(&pstats->syncp);
3780 case htons(ETH_P_IP):
3781 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
3783 case IGMP_HOST_MEMBERSHIP_REPORT:
3784 pstats->mstats.igmp_v1reports[dir]++;
3786 case IGMPV2_HOST_MEMBERSHIP_REPORT:
3787 pstats->mstats.igmp_v2reports[dir]++;
3789 case IGMPV3_HOST_MEMBERSHIP_REPORT:
3790 pstats->mstats.igmp_v3reports[dir]++;
3792 case IGMP_HOST_MEMBERSHIP_QUERY:
3793 if (t_len != sizeof(struct igmphdr)) {
3794 pstats->mstats.igmp_v3queries[dir]++;
3796 unsigned int offset = skb_transport_offset(skb);
3797 struct igmphdr *ih, _ihdr;
3799 ih = skb_header_pointer(skb, offset,
3800 sizeof(_ihdr), &_ihdr);
3804 pstats->mstats.igmp_v1queries[dir]++;
3806 pstats->mstats.igmp_v2queries[dir]++;
3809 case IGMP_HOST_LEAVE_MESSAGE:
3810 pstats->mstats.igmp_leaves[dir]++;
3814 #if IS_ENABLED(CONFIG_IPV6)
3815 case htons(ETH_P_IPV6):
3816 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
3817 sizeof(struct ipv6hdr);
3818 t_len -= skb_network_header_len(skb);
3820 case ICMPV6_MGM_REPORT:
3821 pstats->mstats.mld_v1reports[dir]++;
3823 case ICMPV6_MLD2_REPORT:
3824 pstats->mstats.mld_v2reports[dir]++;
3826 case ICMPV6_MGM_QUERY:
3827 if (t_len != sizeof(struct mld_msg))
3828 pstats->mstats.mld_v2queries[dir]++;
3830 pstats->mstats.mld_v1queries[dir]++;
3832 case ICMPV6_MGM_REDUCTION:
3833 pstats->mstats.mld_leaves[dir]++;
3837 #endif /* CONFIG_IPV6 */
3839 u64_stats_update_end(&pstats->syncp);
3842 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
3843 const struct sk_buff *skb, u8 type, u8 dir)
3845 struct bridge_mcast_stats __percpu *stats;
3847 /* if multicast_disabled is true then igmp type can't be set */
3848 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
3852 stats = p->mcast_stats;
3854 stats = br->mcast_stats;
3855 if (WARN_ON(!stats))
3858 br_mcast_stats_add(stats, skb, type, dir);
3861 int br_multicast_init_stats(struct net_bridge *br)
3863 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
3864 if (!br->mcast_stats)
3870 void br_multicast_uninit_stats(struct net_bridge *br)
3872 free_percpu(br->mcast_stats);
3875 /* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */
3876 static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src)
3878 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
3879 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
3882 void br_multicast_get_stats(const struct net_bridge *br,
3883 const struct net_bridge_port *p,
3884 struct br_mcast_stats *dest)
3886 struct bridge_mcast_stats __percpu *stats;
3887 struct br_mcast_stats tdst;
3890 memset(dest, 0, sizeof(*dest));
3892 stats = p->mcast_stats;
3894 stats = br->mcast_stats;
3895 if (WARN_ON(!stats))
3898 memset(&tdst, 0, sizeof(tdst));
3899 for_each_possible_cpu(i) {
3900 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
3901 struct br_mcast_stats temp;
3905 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
3906 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
3907 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
3909 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
3910 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
3911 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
3912 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
3913 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
3914 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
3915 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
3916 tdst.igmp_parse_errors += temp.igmp_parse_errors;
3918 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
3919 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
3920 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
3921 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
3922 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
3923 tdst.mld_parse_errors += temp.mld_parse_errors;
3925 memcpy(dest, &tdst, sizeof(*dest));
3928 int br_mdb_hash_init(struct net_bridge *br)
3932 err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params);
3936 err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
3938 rhashtable_destroy(&br->sg_port_tbl);
3945 void br_mdb_hash_fini(struct net_bridge *br)
3947 rhashtable_destroy(&br->sg_port_tbl);
3948 rhashtable_destroy(&br->mdb_hash_tbl);