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));
185 return br_mdb_ip_get_rcu(br, &ip);
188 static bool br_port_group_equal(struct net_bridge_port_group *p,
189 struct net_bridge_port *port,
190 const unsigned char *src)
192 if (p->key.port != port)
195 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
198 return ether_addr_equal(src, p->eth_addr);
201 static void __fwd_add_star_excl(struct net_bridge_port_group *pg,
204 struct net_bridge_port_group_sg_key sg_key;
205 struct net_bridge *br = pg->key.port->br;
206 struct net_bridge_port_group *src_pg;
208 memset(&sg_key, 0, sizeof(sg_key));
209 sg_key.port = pg->key.port;
210 sg_key.addr = *sg_ip;
211 if (br_sg_port_find(br, &sg_key))
214 src_pg = __br_multicast_add_group(br, pg->key.port, sg_ip, pg->eth_addr,
215 MCAST_INCLUDE, false, false);
216 if (IS_ERR_OR_NULL(src_pg) ||
217 src_pg->rt_protocol != RTPROT_KERNEL)
220 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
223 static void __fwd_del_star_excl(struct net_bridge_port_group *pg,
226 struct net_bridge_port_group_sg_key sg_key;
227 struct net_bridge *br = pg->key.port->br;
228 struct net_bridge_port_group *src_pg;
230 memset(&sg_key, 0, sizeof(sg_key));
231 sg_key.port = pg->key.port;
232 sg_key.addr = *sg_ip;
233 src_pg = br_sg_port_find(br, &sg_key);
234 if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) ||
235 src_pg->rt_protocol != RTPROT_KERNEL)
238 br_multicast_find_del_pg(br, src_pg);
241 /* When a port group transitions to (or is added as) EXCLUDE we need to add it
242 * to all other ports' S,G entries which are not blocked by the current group
243 * for proper replication, the assumption is that any S,G blocked entries
244 * are already added so the S,G,port lookup should skip them.
245 * When a port group transitions from EXCLUDE -> INCLUDE mode or is being
246 * deleted we need to remove it from all ports' S,G entries where it was
247 * automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL).
249 void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
252 struct net_bridge *br = pg->key.port->br;
253 struct net_bridge_port_group *pg_lst;
254 struct net_bridge_mdb_entry *mp;
257 if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr)))
260 mp = br_mdb_ip_get(br, &pg->key.addr);
264 memset(&sg_ip, 0, sizeof(sg_ip));
265 sg_ip = pg->key.addr;
266 for (pg_lst = mlock_dereference(mp->ports, br);
268 pg_lst = mlock_dereference(pg_lst->next, br)) {
269 struct net_bridge_group_src *src_ent;
273 hlist_for_each_entry(src_ent, &pg_lst->src_list, node) {
274 if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
276 sg_ip.src = src_ent->addr.src;
277 switch (filter_mode) {
279 __fwd_del_star_excl(pg, &sg_ip);
282 __fwd_add_star_excl(pg, &sg_ip);
289 /* called when adding a new S,G with host_joined == false by default */
290 static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp,
291 struct net_bridge_port_group *sg)
293 struct net_bridge_mdb_entry *sg_mp;
295 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
297 if (!star_mp->host_joined)
300 sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr);
303 sg_mp->host_joined = true;
306 /* set the host_joined state of all of *,G's S,G entries */
307 static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp)
309 struct net_bridge *br = star_mp->br;
310 struct net_bridge_mdb_entry *sg_mp;
311 struct net_bridge_port_group *pg;
314 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
317 memset(&sg_ip, 0, sizeof(sg_ip));
318 sg_ip = star_mp->addr;
319 for (pg = mlock_dereference(star_mp->ports, br);
321 pg = mlock_dereference(pg->next, br)) {
322 struct net_bridge_group_src *src_ent;
324 hlist_for_each_entry(src_ent, &pg->src_list, node) {
325 if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
327 sg_ip.src = src_ent->addr.src;
328 sg_mp = br_mdb_ip_get(br, &sg_ip);
331 sg_mp->host_joined = star_mp->host_joined;
336 static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp)
338 struct net_bridge_port_group __rcu **pp;
339 struct net_bridge_port_group *p;
341 /* *,G exclude ports are only added to S,G entries */
342 if (WARN_ON(br_multicast_is_star_g(&sgmp->addr)))
345 /* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports
346 * we should ignore perm entries since they're managed by user-space
348 for (pp = &sgmp->ports;
349 (p = mlock_dereference(*pp, sgmp->br)) != NULL;
351 if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL |
352 MDB_PG_FLAGS_PERMANENT)))
355 /* currently the host can only have joined the *,G which means
356 * we treat it as EXCLUDE {}, so for an S,G it's considered a
357 * STAR_EXCLUDE entry and we can safely leave it
359 sgmp->host_joined = false;
361 for (pp = &sgmp->ports;
362 (p = mlock_dereference(*pp, sgmp->br)) != NULL;) {
363 if (!(p->flags & MDB_PG_FLAGS_PERMANENT))
364 br_multicast_del_pg(sgmp, p, pp);
370 void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
371 struct net_bridge_port_group *sg)
373 struct net_bridge_port_group_sg_key sg_key;
374 struct net_bridge *br = star_mp->br;
375 struct net_bridge_port_group *pg;
377 if (WARN_ON(br_multicast_is_star_g(&sg->key.addr)))
379 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
382 br_multicast_sg_host_state(star_mp, sg);
383 memset(&sg_key, 0, sizeof(sg_key));
384 sg_key.addr = sg->key.addr;
385 /* we need to add all exclude ports to the S,G */
386 for (pg = mlock_dereference(star_mp->ports, br);
388 pg = mlock_dereference(pg->next, br)) {
389 struct net_bridge_port_group *src_pg;
391 if (pg == sg || pg->filter_mode == MCAST_INCLUDE)
394 sg_key.port = pg->key.port;
395 if (br_sg_port_find(br, &sg_key))
398 src_pg = __br_multicast_add_group(br, pg->key.port,
401 MCAST_INCLUDE, false, false);
402 if (IS_ERR_OR_NULL(src_pg) ||
403 src_pg->rt_protocol != RTPROT_KERNEL)
405 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
409 static void br_multicast_fwd_src_add(struct net_bridge_group_src *src)
411 struct net_bridge_mdb_entry *star_mp;
412 struct net_bridge_port_group *sg;
415 if (src->flags & BR_SGRP_F_INSTALLED)
418 memset(&sg_ip, 0, sizeof(sg_ip));
419 sg_ip = src->pg->key.addr;
420 sg_ip.src = src->addr.src;
421 sg = __br_multicast_add_group(src->br, src->pg->key.port, &sg_ip,
422 src->pg->eth_addr, MCAST_INCLUDE, false,
423 !timer_pending(&src->timer));
424 if (IS_ERR_OR_NULL(sg))
426 src->flags |= BR_SGRP_F_INSTALLED;
427 sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL;
429 /* if it was added by user-space as perm we can skip next steps */
430 if (sg->rt_protocol != RTPROT_KERNEL &&
431 (sg->flags & MDB_PG_FLAGS_PERMANENT))
434 /* the kernel is now responsible for removing this S,G */
435 del_timer(&sg->timer);
436 star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr);
440 br_multicast_sg_add_exclude_ports(star_mp, sg);
443 static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src)
445 struct net_bridge_port_group *p, *pg = src->pg;
446 struct net_bridge_port_group __rcu **pp;
447 struct net_bridge_mdb_entry *mp;
450 memset(&sg_ip, 0, sizeof(sg_ip));
451 sg_ip = pg->key.addr;
452 sg_ip.src = src->addr.src;
454 mp = br_mdb_ip_get(src->br, &sg_ip);
458 for (pp = &mp->ports;
459 (p = mlock_dereference(*pp, src->br)) != NULL;
461 if (!br_port_group_equal(p, pg->key.port, pg->eth_addr))
464 if (p->rt_protocol != RTPROT_KERNEL &&
465 (p->flags & MDB_PG_FLAGS_PERMANENT))
468 br_multicast_del_pg(mp, p, pp);
471 src->flags &= ~BR_SGRP_F_INSTALLED;
474 /* install S,G and based on src's timer enable or disable forwarding */
475 static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src)
477 struct net_bridge_port_group_sg_key sg_key;
478 struct net_bridge_port_group *sg;
481 br_multicast_fwd_src_add(src);
483 memset(&sg_key, 0, sizeof(sg_key));
484 sg_key.addr = src->pg->key.addr;
485 sg_key.addr.src = src->addr.src;
486 sg_key.port = src->pg->key.port;
488 sg = br_sg_port_find(src->br, &sg_key);
489 if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT))
492 old_flags = sg->flags;
493 if (timer_pending(&src->timer))
494 sg->flags &= ~MDB_PG_FLAGS_BLOCKED;
496 sg->flags |= MDB_PG_FLAGS_BLOCKED;
498 if (old_flags != sg->flags) {
499 struct net_bridge_mdb_entry *sg_mp;
501 sg_mp = br_mdb_ip_get(src->br, &sg_key.addr);
504 br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB);
508 static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc)
510 struct net_bridge_mdb_entry *mp;
512 mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc);
513 WARN_ON(!hlist_unhashed(&mp->mdb_node));
516 del_timer_sync(&mp->timer);
520 static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp)
522 struct net_bridge *br = mp->br;
524 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
526 hlist_del_init_rcu(&mp->mdb_node);
527 hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list);
528 queue_work(system_long_wq, &br->mcast_gc_work);
531 static void br_multicast_group_expired(struct timer_list *t)
533 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
534 struct net_bridge *br = mp->br;
536 spin_lock(&br->multicast_lock);
537 if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) ||
538 timer_pending(&mp->timer))
541 br_multicast_host_leave(mp, true);
545 br_multicast_del_mdb_entry(mp);
547 spin_unlock(&br->multicast_lock);
550 static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc)
552 struct net_bridge_group_src *src;
554 src = container_of(gc, struct net_bridge_group_src, mcast_gc);
555 WARN_ON(!hlist_unhashed(&src->node));
557 del_timer_sync(&src->timer);
561 static void br_multicast_del_group_src(struct net_bridge_group_src *src)
563 struct net_bridge *br = src->pg->key.port->br;
565 br_multicast_fwd_src_remove(src);
566 hlist_del_init_rcu(&src->node);
568 hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list);
569 queue_work(system_long_wq, &br->mcast_gc_work);
572 static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc)
574 struct net_bridge_port_group *pg;
576 pg = container_of(gc, struct net_bridge_port_group, mcast_gc);
577 WARN_ON(!hlist_unhashed(&pg->mglist));
578 WARN_ON(!hlist_empty(&pg->src_list));
580 del_timer_sync(&pg->rexmit_timer);
581 del_timer_sync(&pg->timer);
585 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
586 struct net_bridge_port_group *pg,
587 struct net_bridge_port_group __rcu **pp)
589 struct net_bridge *br = pg->key.port->br;
590 struct net_bridge_group_src *ent;
591 struct hlist_node *tmp;
593 rcu_assign_pointer(*pp, pg->next);
594 hlist_del_init(&pg->mglist);
595 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
596 br_multicast_del_group_src(ent);
597 br_mdb_notify(br->dev, mp, pg, RTM_DELMDB);
598 if (!br_multicast_is_star_g(&mp->addr)) {
599 rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode,
600 br_sg_port_rht_params);
601 br_multicast_sg_del_exclude_ports(mp);
603 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
605 hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list);
606 queue_work(system_long_wq, &br->mcast_gc_work);
608 if (!mp->ports && !mp->host_joined && netif_running(br->dev))
609 mod_timer(&mp->timer, jiffies);
612 static void br_multicast_find_del_pg(struct net_bridge *br,
613 struct net_bridge_port_group *pg)
615 struct net_bridge_port_group __rcu **pp;
616 struct net_bridge_mdb_entry *mp;
617 struct net_bridge_port_group *p;
619 mp = br_mdb_ip_get(br, &pg->key.addr);
623 for (pp = &mp->ports;
624 (p = mlock_dereference(*pp, br)) != NULL;
629 br_multicast_del_pg(mp, pg, pp);
636 static void br_multicast_port_group_expired(struct timer_list *t)
638 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
639 struct net_bridge_group_src *src_ent;
640 struct net_bridge *br = pg->key.port->br;
641 struct hlist_node *tmp;
644 spin_lock(&br->multicast_lock);
645 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
646 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
649 changed = !!(pg->filter_mode == MCAST_EXCLUDE);
650 pg->filter_mode = MCAST_INCLUDE;
651 hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) {
652 if (!timer_pending(&src_ent->timer)) {
653 br_multicast_del_group_src(src_ent);
658 if (hlist_empty(&pg->src_list)) {
659 br_multicast_find_del_pg(br, pg);
660 } else if (changed) {
661 struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr);
663 if (changed && br_multicast_is_star_g(&pg->key.addr))
664 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
668 br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB);
671 spin_unlock(&br->multicast_lock);
674 static void br_multicast_gc(struct hlist_head *head)
676 struct net_bridge_mcast_gc *gcent;
677 struct hlist_node *tmp;
679 hlist_for_each_entry_safe(gcent, tmp, head, gc_node) {
680 hlist_del_init(&gcent->gc_node);
681 gcent->destroy(gcent);
685 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
686 struct net_bridge_port_group *pg,
687 __be32 ip_dst, __be32 group,
688 bool with_srcs, bool over_lmqt,
689 u8 sflag, u8 *igmp_type,
692 struct net_bridge_port *p = pg ? pg->key.port : NULL;
693 struct net_bridge_group_src *ent;
694 size_t pkt_size, igmp_hdr_size;
695 unsigned long now = jiffies;
696 struct igmpv3_query *ihv3;
697 void *csum_start = NULL;
698 __sum16 *csum = NULL;
706 igmp_hdr_size = sizeof(*ih);
707 if (br->multicast_igmp_version == 3) {
708 igmp_hdr_size = sizeof(*ihv3);
709 if (pg && with_srcs) {
710 lmqt = now + (br->multicast_last_member_interval *
711 br->multicast_last_member_count);
712 hlist_for_each_entry(ent, &pg->src_list, node) {
713 if (over_lmqt == time_after(ent->timer.expires,
715 ent->src_query_rexmit_cnt > 0)
721 igmp_hdr_size += lmqt_srcs * sizeof(__be32);
725 pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size;
726 if ((p && pkt_size > p->dev->mtu) ||
727 pkt_size > br->dev->mtu)
730 skb = netdev_alloc_skb_ip_align(br->dev, pkt_size);
734 skb->protocol = htons(ETH_P_IP);
736 skb_reset_mac_header(skb);
739 ether_addr_copy(eth->h_source, br->dev->dev_addr);
740 ip_eth_mc_map(ip_dst, eth->h_dest);
741 eth->h_proto = htons(ETH_P_IP);
742 skb_put(skb, sizeof(*eth));
744 skb_set_network_header(skb, skb->len);
746 iph->tot_len = htons(pkt_size - sizeof(*eth));
752 iph->frag_off = htons(IP_DF);
754 iph->protocol = IPPROTO_IGMP;
755 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
756 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
758 ((u8 *)&iph[1])[0] = IPOPT_RA;
759 ((u8 *)&iph[1])[1] = 4;
760 ((u8 *)&iph[1])[2] = 0;
761 ((u8 *)&iph[1])[3] = 0;
765 skb_set_transport_header(skb, skb->len);
766 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
768 switch (br->multicast_igmp_version) {
771 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
772 ih->code = (group ? br->multicast_last_member_interval :
773 br->multicast_query_response_interval) /
774 (HZ / IGMP_TIMER_SCALE);
778 csum_start = (void *)ih;
781 ihv3 = igmpv3_query_hdr(skb);
782 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
783 ihv3->code = (group ? br->multicast_last_member_interval :
784 br->multicast_query_response_interval) /
785 (HZ / IGMP_TIMER_SCALE);
787 ihv3->qqic = br->multicast_query_interval / HZ;
788 ihv3->nsrcs = htons(lmqt_srcs);
790 ihv3->suppress = sflag;
794 csum_start = (void *)ihv3;
795 if (!pg || !with_srcs)
799 hlist_for_each_entry(ent, &pg->src_list, node) {
800 if (over_lmqt == time_after(ent->timer.expires,
802 ent->src_query_rexmit_cnt > 0) {
803 ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4;
804 ent->src_query_rexmit_cnt--;
805 if (need_rexmit && ent->src_query_rexmit_cnt)
809 if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) {
816 if (WARN_ON(!csum || !csum_start)) {
821 *csum = ip_compute_csum(csum_start, igmp_hdr_size);
822 skb_put(skb, igmp_hdr_size);
823 __skb_pull(skb, sizeof(*eth));
829 #if IS_ENABLED(CONFIG_IPV6)
830 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
831 struct net_bridge_port_group *pg,
832 const struct in6_addr *ip6_dst,
833 const struct in6_addr *group,
834 bool with_srcs, bool over_llqt,
835 u8 sflag, u8 *igmp_type,
838 struct net_bridge_port *p = pg ? pg->key.port : NULL;
839 struct net_bridge_group_src *ent;
840 size_t pkt_size, mld_hdr_size;
841 unsigned long now = jiffies;
842 struct mld2_query *mld2q;
843 void *csum_start = NULL;
844 unsigned long interval;
845 __sum16 *csum = NULL;
846 struct ipv6hdr *ip6h;
847 struct mld_msg *mldq;
854 mld_hdr_size = sizeof(*mldq);
855 if (br->multicast_mld_version == 2) {
856 mld_hdr_size = sizeof(*mld2q);
857 if (pg && with_srcs) {
858 llqt = now + (br->multicast_last_member_interval *
859 br->multicast_last_member_count);
860 hlist_for_each_entry(ent, &pg->src_list, node) {
861 if (over_llqt == time_after(ent->timer.expires,
863 ent->src_query_rexmit_cnt > 0)
869 mld_hdr_size += llqt_srcs * sizeof(struct in6_addr);
873 pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size;
874 if ((p && pkt_size > p->dev->mtu) ||
875 pkt_size > br->dev->mtu)
878 skb = netdev_alloc_skb_ip_align(br->dev, pkt_size);
882 skb->protocol = htons(ETH_P_IPV6);
884 /* Ethernet header */
885 skb_reset_mac_header(skb);
888 ether_addr_copy(eth->h_source, br->dev->dev_addr);
889 eth->h_proto = htons(ETH_P_IPV6);
890 skb_put(skb, sizeof(*eth));
892 /* IPv6 header + HbH option */
893 skb_set_network_header(skb, skb->len);
894 ip6h = ipv6_hdr(skb);
896 *(__force __be32 *)ip6h = htonl(0x60000000);
897 ip6h->payload_len = htons(8 + mld_hdr_size);
898 ip6h->nexthdr = IPPROTO_HOPOPTS;
900 ip6h->daddr = *ip6_dst;
901 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
904 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
908 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
909 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
911 hopopt = (u8 *)(ip6h + 1);
912 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
913 hopopt[1] = 0; /* length of HbH */
914 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
915 hopopt[3] = 2; /* Length of RA Option */
916 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
918 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
919 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
921 skb_put(skb, sizeof(*ip6h) + 8);
924 skb_set_transport_header(skb, skb->len);
925 interval = ipv6_addr_any(group) ?
926 br->multicast_query_response_interval :
927 br->multicast_last_member_interval;
928 *igmp_type = ICMPV6_MGM_QUERY;
929 switch (br->multicast_mld_version) {
931 mldq = (struct mld_msg *)icmp6_hdr(skb);
932 mldq->mld_type = ICMPV6_MGM_QUERY;
935 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
936 mldq->mld_reserved = 0;
937 mldq->mld_mca = *group;
938 csum = &mldq->mld_cksum;
939 csum_start = (void *)mldq;
942 mld2q = (struct mld2_query *)icmp6_hdr(skb);
943 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
944 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
945 mld2q->mld2q_code = 0;
946 mld2q->mld2q_cksum = 0;
947 mld2q->mld2q_resv1 = 0;
948 mld2q->mld2q_resv2 = 0;
949 mld2q->mld2q_suppress = sflag;
950 mld2q->mld2q_qrv = 2;
951 mld2q->mld2q_nsrcs = htons(llqt_srcs);
952 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
953 mld2q->mld2q_mca = *group;
954 csum = &mld2q->mld2q_cksum;
955 csum_start = (void *)mld2q;
956 if (!pg || !with_srcs)
960 hlist_for_each_entry(ent, &pg->src_list, node) {
961 if (over_llqt == time_after(ent->timer.expires,
963 ent->src_query_rexmit_cnt > 0) {
964 mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6;
965 ent->src_query_rexmit_cnt--;
966 if (need_rexmit && ent->src_query_rexmit_cnt)
970 if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) {
977 if (WARN_ON(!csum || !csum_start)) {
982 *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size,
984 csum_partial(csum_start, mld_hdr_size, 0));
985 skb_put(skb, mld_hdr_size);
986 __skb_pull(skb, sizeof(*eth));
993 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
994 struct net_bridge_port_group *pg,
995 struct br_ip *ip_dst,
997 bool with_srcs, bool over_lmqt,
998 u8 sflag, u8 *igmp_type,
1003 switch (group->proto) {
1004 case htons(ETH_P_IP):
1005 ip4_dst = ip_dst ? ip_dst->dst.ip4 : htonl(INADDR_ALLHOSTS_GROUP);
1006 return br_ip4_multicast_alloc_query(br, pg,
1007 ip4_dst, group->dst.ip4,
1008 with_srcs, over_lmqt,
1011 #if IS_ENABLED(CONFIG_IPV6)
1012 case htons(ETH_P_IPV6): {
1013 struct in6_addr ip6_dst;
1016 ip6_dst = ip_dst->dst.ip6;
1018 ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0,
1021 return br_ip6_multicast_alloc_query(br, pg,
1022 &ip6_dst, &group->dst.ip6,
1023 with_srcs, over_lmqt,
1032 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
1033 struct br_ip *group)
1035 struct net_bridge_mdb_entry *mp;
1038 mp = br_mdb_ip_get(br, group);
1042 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
1043 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
1044 return ERR_PTR(-E2BIG);
1047 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
1049 return ERR_PTR(-ENOMEM);
1053 mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry;
1054 timer_setup(&mp->timer, br_multicast_group_expired, 0);
1055 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
1061 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
1067 static void br_multicast_group_src_expired(struct timer_list *t)
1069 struct net_bridge_group_src *src = from_timer(src, t, timer);
1070 struct net_bridge_port_group *pg;
1071 struct net_bridge *br = src->br;
1073 spin_lock(&br->multicast_lock);
1074 if (hlist_unhashed(&src->node) || !netif_running(br->dev) ||
1075 timer_pending(&src->timer))
1079 if (pg->filter_mode == MCAST_INCLUDE) {
1080 br_multicast_del_group_src(src);
1081 if (!hlist_empty(&pg->src_list))
1083 br_multicast_find_del_pg(br, pg);
1085 br_multicast_fwd_src_handle(src);
1089 spin_unlock(&br->multicast_lock);
1092 static struct net_bridge_group_src *
1093 br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip)
1095 struct net_bridge_group_src *ent;
1097 switch (ip->proto) {
1098 case htons(ETH_P_IP):
1099 hlist_for_each_entry(ent, &pg->src_list, node)
1100 if (ip->src.ip4 == ent->addr.src.ip4)
1103 #if IS_ENABLED(CONFIG_IPV6)
1104 case htons(ETH_P_IPV6):
1105 hlist_for_each_entry(ent, &pg->src_list, node)
1106 if (!ipv6_addr_cmp(&ent->addr.src.ip6, &ip->src.ip6))
1115 static struct net_bridge_group_src *
1116 br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip)
1118 struct net_bridge_group_src *grp_src;
1120 if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT))
1123 switch (src_ip->proto) {
1124 case htons(ETH_P_IP):
1125 if (ipv4_is_zeronet(src_ip->src.ip4) ||
1126 ipv4_is_multicast(src_ip->src.ip4))
1129 #if IS_ENABLED(CONFIG_IPV6)
1130 case htons(ETH_P_IPV6):
1131 if (ipv6_addr_any(&src_ip->src.ip6) ||
1132 ipv6_addr_is_multicast(&src_ip->src.ip6))
1138 grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC);
1139 if (unlikely(!grp_src))
1143 grp_src->br = pg->key.port->br;
1144 grp_src->addr = *src_ip;
1145 grp_src->mcast_gc.destroy = br_multicast_destroy_group_src;
1146 timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0);
1148 hlist_add_head_rcu(&grp_src->node, &pg->src_list);
1154 struct net_bridge_port_group *br_multicast_new_port_group(
1155 struct net_bridge_port *port,
1156 struct br_ip *group,
1157 struct net_bridge_port_group __rcu *next,
1158 unsigned char flags,
1159 const unsigned char *src,
1163 struct net_bridge_port_group *p;
1165 p = kzalloc(sizeof(*p), GFP_ATOMIC);
1169 p->key.addr = *group;
1172 p->filter_mode = filter_mode;
1173 p->rt_protocol = rt_protocol;
1174 p->mcast_gc.destroy = br_multicast_destroy_port_group;
1175 INIT_HLIST_HEAD(&p->src_list);
1177 if (!br_multicast_is_star_g(group) &&
1178 rhashtable_lookup_insert_fast(&port->br->sg_port_tbl, &p->rhnode,
1179 br_sg_port_rht_params)) {
1184 rcu_assign_pointer(p->next, next);
1185 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
1186 timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0);
1187 hlist_add_head(&p->mglist, &port->mglist);
1190 memcpy(p->eth_addr, src, ETH_ALEN);
1192 eth_broadcast_addr(p->eth_addr);
1197 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify)
1199 if (!mp->host_joined) {
1200 mp->host_joined = true;
1201 if (br_multicast_is_star_g(&mp->addr))
1202 br_multicast_star_g_host_state(mp);
1204 br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB);
1206 mod_timer(&mp->timer, jiffies + mp->br->multicast_membership_interval);
1209 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify)
1211 if (!mp->host_joined)
1214 mp->host_joined = false;
1215 if (br_multicast_is_star_g(&mp->addr))
1216 br_multicast_star_g_host_state(mp);
1218 br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB);
1221 static struct net_bridge_port_group *
1222 __br_multicast_add_group(struct net_bridge *br,
1223 struct net_bridge_port *port,
1224 struct br_ip *group,
1225 const unsigned char *src,
1230 struct net_bridge_port_group __rcu **pp;
1231 struct net_bridge_port_group *p = NULL;
1232 struct net_bridge_mdb_entry *mp;
1233 unsigned long now = jiffies;
1235 if (!netif_running(br->dev) ||
1236 (port && port->state == BR_STATE_DISABLED))
1239 mp = br_multicast_new_group(br, group);
1241 return ERR_PTR(PTR_ERR(mp));
1244 br_multicast_host_join(mp, true);
1248 for (pp = &mp->ports;
1249 (p = mlock_dereference(*pp, br)) != NULL;
1251 if (br_port_group_equal(p, port, src))
1253 if ((unsigned long)p->key.port < (unsigned long)port)
1257 p = br_multicast_new_port_group(port, group, *pp, 0, src, filter_mode,
1260 p = ERR_PTR(-ENOMEM);
1263 rcu_assign_pointer(*pp, p);
1265 p->flags |= MDB_PG_FLAGS_BLOCKED;
1266 br_mdb_notify(br->dev, mp, p, RTM_NEWMDB);
1270 mod_timer(&p->timer, now + br->multicast_membership_interval);
1276 static int br_multicast_add_group(struct net_bridge *br,
1277 struct net_bridge_port *port,
1278 struct br_ip *group,
1279 const unsigned char *src,
1283 struct net_bridge_port_group *pg;
1286 spin_lock(&br->multicast_lock);
1287 pg = __br_multicast_add_group(br, port, group, src, filter_mode,
1288 igmpv2_mldv1, false);
1289 /* NULL is considered valid for host joined groups */
1290 err = IS_ERR(pg) ? PTR_ERR(pg) : 0;
1291 spin_unlock(&br->multicast_lock);
1296 static int br_ip4_multicast_add_group(struct net_bridge *br,
1297 struct net_bridge_port *port,
1300 const unsigned char *src,
1303 struct br_ip br_group;
1306 if (ipv4_is_local_multicast(group))
1309 memset(&br_group, 0, sizeof(br_group));
1310 br_group.dst.ip4 = group;
1311 br_group.proto = htons(ETH_P_IP);
1313 filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE;
1315 return br_multicast_add_group(br, port, &br_group, src, filter_mode,
1319 #if IS_ENABLED(CONFIG_IPV6)
1320 static int br_ip6_multicast_add_group(struct net_bridge *br,
1321 struct net_bridge_port *port,
1322 const struct in6_addr *group,
1324 const unsigned char *src,
1327 struct br_ip br_group;
1330 if (ipv6_addr_is_ll_all_nodes(group))
1333 memset(&br_group, 0, sizeof(br_group));
1334 br_group.dst.ip6 = *group;
1335 br_group.proto = htons(ETH_P_IPV6);
1337 filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE;
1339 return br_multicast_add_group(br, port, &br_group, src, filter_mode,
1344 static void br_multicast_router_expired(struct timer_list *t)
1346 struct net_bridge_port *port =
1347 from_timer(port, t, multicast_router_timer);
1348 struct net_bridge *br = port->br;
1350 spin_lock(&br->multicast_lock);
1351 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1352 port->multicast_router == MDB_RTR_TYPE_PERM ||
1353 timer_pending(&port->multicast_router_timer))
1356 __del_port_router(port);
1358 spin_unlock(&br->multicast_lock);
1361 static void br_mc_router_state_change(struct net_bridge *p,
1364 struct switchdev_attr attr = {
1366 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
1367 .flags = SWITCHDEV_F_DEFER,
1368 .u.mrouter = is_mc_router,
1371 switchdev_port_attr_set(p->dev, &attr);
1374 static void br_multicast_local_router_expired(struct timer_list *t)
1376 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
1378 spin_lock(&br->multicast_lock);
1379 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
1380 br->multicast_router == MDB_RTR_TYPE_PERM ||
1381 timer_pending(&br->multicast_router_timer))
1384 br_mc_router_state_change(br, false);
1386 spin_unlock(&br->multicast_lock);
1389 static void br_multicast_querier_expired(struct net_bridge *br,
1390 struct bridge_mcast_own_query *query)
1392 spin_lock(&br->multicast_lock);
1393 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1396 br_multicast_start_querier(br, query);
1399 spin_unlock(&br->multicast_lock);
1402 static void br_ip4_multicast_querier_expired(struct timer_list *t)
1404 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
1406 br_multicast_querier_expired(br, &br->ip4_own_query);
1409 #if IS_ENABLED(CONFIG_IPV6)
1410 static void br_ip6_multicast_querier_expired(struct timer_list *t)
1412 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
1414 br_multicast_querier_expired(br, &br->ip6_own_query);
1418 static void br_multicast_select_own_querier(struct net_bridge *br,
1420 struct sk_buff *skb)
1422 if (ip->proto == htons(ETH_P_IP))
1423 br->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr;
1424 #if IS_ENABLED(CONFIG_IPV6)
1426 br->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr;
1430 static void __br_multicast_send_query(struct net_bridge *br,
1431 struct net_bridge_port *port,
1432 struct net_bridge_port_group *pg,
1433 struct br_ip *ip_dst,
1434 struct br_ip *group,
1439 bool over_lmqt = !!sflag;
1440 struct sk_buff *skb;
1444 skb = br_multicast_alloc_query(br, pg, ip_dst, group, with_srcs,
1445 over_lmqt, sflag, &igmp_type,
1451 skb->dev = port->dev;
1452 br_multicast_count(br, port, skb, igmp_type,
1454 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
1455 dev_net(port->dev), NULL, skb, NULL, skb->dev,
1456 br_dev_queue_push_xmit);
1458 if (over_lmqt && with_srcs && sflag) {
1460 goto again_under_lmqt;
1463 br_multicast_select_own_querier(br, group, skb);
1464 br_multicast_count(br, port, skb, igmp_type,
1470 static void br_multicast_send_query(struct net_bridge *br,
1471 struct net_bridge_port *port,
1472 struct bridge_mcast_own_query *own_query)
1474 struct bridge_mcast_other_query *other_query = NULL;
1475 struct br_ip br_group;
1478 if (!netif_running(br->dev) ||
1479 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
1480 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
1483 memset(&br_group.dst, 0, sizeof(br_group.dst));
1485 if (port ? (own_query == &port->ip4_own_query) :
1486 (own_query == &br->ip4_own_query)) {
1487 other_query = &br->ip4_other_query;
1488 br_group.proto = htons(ETH_P_IP);
1489 #if IS_ENABLED(CONFIG_IPV6)
1491 other_query = &br->ip6_other_query;
1492 br_group.proto = htons(ETH_P_IPV6);
1496 if (!other_query || timer_pending(&other_query->timer))
1499 __br_multicast_send_query(br, port, NULL, NULL, &br_group, false, 0,
1503 time += own_query->startup_sent < br->multicast_startup_query_count ?
1504 br->multicast_startup_query_interval :
1505 br->multicast_query_interval;
1506 mod_timer(&own_query->timer, time);
1510 br_multicast_port_query_expired(struct net_bridge_port *port,
1511 struct bridge_mcast_own_query *query)
1513 struct net_bridge *br = port->br;
1515 spin_lock(&br->multicast_lock);
1516 if (port->state == BR_STATE_DISABLED ||
1517 port->state == BR_STATE_BLOCKING)
1520 if (query->startup_sent < br->multicast_startup_query_count)
1521 query->startup_sent++;
1523 br_multicast_send_query(port->br, port, query);
1526 spin_unlock(&br->multicast_lock);
1529 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
1531 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
1533 br_multicast_port_query_expired(port, &port->ip4_own_query);
1536 #if IS_ENABLED(CONFIG_IPV6)
1537 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
1539 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
1541 br_multicast_port_query_expired(port, &port->ip6_own_query);
1545 static void br_multicast_port_group_rexmit(struct timer_list *t)
1547 struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer);
1548 struct bridge_mcast_other_query *other_query = NULL;
1549 struct net_bridge *br = pg->key.port->br;
1550 bool need_rexmit = false;
1552 spin_lock(&br->multicast_lock);
1553 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
1554 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
1555 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
1558 if (pg->key.addr.proto == htons(ETH_P_IP))
1559 other_query = &br->ip4_other_query;
1560 #if IS_ENABLED(CONFIG_IPV6)
1562 other_query = &br->ip6_other_query;
1565 if (!other_query || timer_pending(&other_query->timer))
1568 if (pg->grp_query_rexmit_cnt) {
1569 pg->grp_query_rexmit_cnt--;
1570 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1571 &pg->key.addr, false, 1, NULL);
1573 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1574 &pg->key.addr, true, 0, &need_rexmit);
1576 if (pg->grp_query_rexmit_cnt || need_rexmit)
1577 mod_timer(&pg->rexmit_timer, jiffies +
1578 br->multicast_last_member_interval);
1580 spin_unlock(&br->multicast_lock);
1583 static void br_mc_disabled_update(struct net_device *dev, bool value)
1585 struct switchdev_attr attr = {
1587 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1588 .flags = SWITCHDEV_F_DEFER,
1589 .u.mc_disabled = !value,
1592 switchdev_port_attr_set(dev, &attr);
1595 int br_multicast_add_port(struct net_bridge_port *port)
1597 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1599 timer_setup(&port->multicast_router_timer,
1600 br_multicast_router_expired, 0);
1601 timer_setup(&port->ip4_own_query.timer,
1602 br_ip4_multicast_port_query_expired, 0);
1603 #if IS_ENABLED(CONFIG_IPV6)
1604 timer_setup(&port->ip6_own_query.timer,
1605 br_ip6_multicast_port_query_expired, 0);
1607 br_mc_disabled_update(port->dev,
1608 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
1610 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1611 if (!port->mcast_stats)
1617 void br_multicast_del_port(struct net_bridge_port *port)
1619 struct net_bridge *br = port->br;
1620 struct net_bridge_port_group *pg;
1621 HLIST_HEAD(deleted_head);
1622 struct hlist_node *n;
1624 /* Take care of the remaining groups, only perm ones should be left */
1625 spin_lock_bh(&br->multicast_lock);
1626 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1627 br_multicast_find_del_pg(br, pg);
1628 hlist_move_list(&br->mcast_gc_list, &deleted_head);
1629 spin_unlock_bh(&br->multicast_lock);
1630 br_multicast_gc(&deleted_head);
1631 del_timer_sync(&port->multicast_router_timer);
1632 free_percpu(port->mcast_stats);
1635 static void br_multicast_enable(struct bridge_mcast_own_query *query)
1637 query->startup_sent = 0;
1639 if (try_to_del_timer_sync(&query->timer) >= 0 ||
1640 del_timer(&query->timer))
1641 mod_timer(&query->timer, jiffies);
1644 static void __br_multicast_enable_port(struct net_bridge_port *port)
1646 struct net_bridge *br = port->br;
1648 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
1651 br_multicast_enable(&port->ip4_own_query);
1652 #if IS_ENABLED(CONFIG_IPV6)
1653 br_multicast_enable(&port->ip6_own_query);
1655 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1656 hlist_unhashed(&port->rlist))
1657 br_multicast_add_router(br, port);
1660 void br_multicast_enable_port(struct net_bridge_port *port)
1662 struct net_bridge *br = port->br;
1664 spin_lock(&br->multicast_lock);
1665 __br_multicast_enable_port(port);
1666 spin_unlock(&br->multicast_lock);
1669 void br_multicast_disable_port(struct net_bridge_port *port)
1671 struct net_bridge *br = port->br;
1672 struct net_bridge_port_group *pg;
1673 struct hlist_node *n;
1675 spin_lock(&br->multicast_lock);
1676 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1677 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1678 br_multicast_find_del_pg(br, pg);
1680 __del_port_router(port);
1682 del_timer(&port->multicast_router_timer);
1683 del_timer(&port->ip4_own_query.timer);
1684 #if IS_ENABLED(CONFIG_IPV6)
1685 del_timer(&port->ip6_own_query.timer);
1687 spin_unlock(&br->multicast_lock);
1690 static int __grp_src_delete_marked(struct net_bridge_port_group *pg)
1692 struct net_bridge_group_src *ent;
1693 struct hlist_node *tmp;
1696 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
1697 if (ent->flags & BR_SGRP_F_DELETE) {
1698 br_multicast_del_group_src(ent);
1705 static void __grp_src_mod_timer(struct net_bridge_group_src *src,
1706 unsigned long expires)
1708 mod_timer(&src->timer, expires);
1709 br_multicast_fwd_src_handle(src);
1712 static void __grp_src_query_marked_and_rexmit(struct net_bridge_port_group *pg)
1714 struct bridge_mcast_other_query *other_query = NULL;
1715 struct net_bridge *br = pg->key.port->br;
1716 u32 lmqc = br->multicast_last_member_count;
1717 unsigned long lmqt, lmi, now = jiffies;
1718 struct net_bridge_group_src *ent;
1720 if (!netif_running(br->dev) ||
1721 !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1724 if (pg->key.addr.proto == htons(ETH_P_IP))
1725 other_query = &br->ip4_other_query;
1726 #if IS_ENABLED(CONFIG_IPV6)
1728 other_query = &br->ip6_other_query;
1731 lmqt = now + br_multicast_lmqt(br);
1732 hlist_for_each_entry(ent, &pg->src_list, node) {
1733 if (ent->flags & BR_SGRP_F_SEND) {
1734 ent->flags &= ~BR_SGRP_F_SEND;
1735 if (ent->timer.expires > lmqt) {
1736 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) &&
1738 !timer_pending(&other_query->timer))
1739 ent->src_query_rexmit_cnt = lmqc;
1740 __grp_src_mod_timer(ent, lmqt);
1745 if (!br_opt_get(br, BROPT_MULTICAST_QUERIER) ||
1746 !other_query || timer_pending(&other_query->timer))
1749 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1750 &pg->key.addr, true, 1, NULL);
1752 lmi = now + br->multicast_last_member_interval;
1753 if (!timer_pending(&pg->rexmit_timer) ||
1754 time_after(pg->rexmit_timer.expires, lmi))
1755 mod_timer(&pg->rexmit_timer, lmi);
1758 static void __grp_send_query_and_rexmit(struct net_bridge_port_group *pg)
1760 struct bridge_mcast_other_query *other_query = NULL;
1761 struct net_bridge *br = pg->key.port->br;
1762 unsigned long now = jiffies, lmi;
1764 if (!netif_running(br->dev) ||
1765 !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1768 if (pg->key.addr.proto == htons(ETH_P_IP))
1769 other_query = &br->ip4_other_query;
1770 #if IS_ENABLED(CONFIG_IPV6)
1772 other_query = &br->ip6_other_query;
1775 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) &&
1776 other_query && !timer_pending(&other_query->timer)) {
1777 lmi = now + br->multicast_last_member_interval;
1778 pg->grp_query_rexmit_cnt = br->multicast_last_member_count - 1;
1779 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1780 &pg->key.addr, false, 0, NULL);
1781 if (!timer_pending(&pg->rexmit_timer) ||
1782 time_after(pg->rexmit_timer.expires, lmi))
1783 mod_timer(&pg->rexmit_timer, lmi);
1786 if (pg->filter_mode == MCAST_EXCLUDE &&
1787 (!timer_pending(&pg->timer) ||
1788 time_after(pg->timer.expires, now + br_multicast_lmqt(br))))
1789 mod_timer(&pg->timer, now + br_multicast_lmqt(br));
1792 /* State Msg type New state Actions
1793 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI
1794 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI
1795 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI
1797 static bool br_multicast_isinc_allow(struct net_bridge_port_group *pg,
1798 void *srcs, u32 nsrcs, size_t src_size)
1800 struct net_bridge *br = pg->key.port->br;
1801 struct net_bridge_group_src *ent;
1802 unsigned long now = jiffies;
1803 bool changed = false;
1804 struct br_ip src_ip;
1807 memset(&src_ip, 0, sizeof(src_ip));
1808 src_ip.proto = pg->key.addr.proto;
1809 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1810 memcpy(&src_ip.src, srcs, src_size);
1811 ent = br_multicast_find_group_src(pg, &src_ip);
1813 ent = br_multicast_new_group_src(pg, &src_ip);
1819 __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
1826 /* State Msg type New state Actions
1827 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
1831 static void __grp_src_isexc_incl(struct net_bridge_port_group *pg,
1832 void *srcs, u32 nsrcs, size_t src_size)
1834 struct net_bridge_group_src *ent;
1835 struct br_ip src_ip;
1838 hlist_for_each_entry(ent, &pg->src_list, node)
1839 ent->flags |= BR_SGRP_F_DELETE;
1841 memset(&src_ip, 0, sizeof(src_ip));
1842 src_ip.proto = pg->key.addr.proto;
1843 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1844 memcpy(&src_ip.src, srcs, src_size);
1845 ent = br_multicast_find_group_src(pg, &src_ip);
1847 ent->flags &= ~BR_SGRP_F_DELETE;
1849 ent = br_multicast_new_group_src(pg, &src_ip);
1851 br_multicast_fwd_src_handle(ent);
1855 __grp_src_delete_marked(pg);
1858 /* State Msg type New state Actions
1859 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI
1864 static bool __grp_src_isexc_excl(struct net_bridge_port_group *pg,
1865 void *srcs, u32 nsrcs, size_t src_size)
1867 struct net_bridge *br = pg->key.port->br;
1868 struct net_bridge_group_src *ent;
1869 unsigned long now = jiffies;
1870 bool changed = false;
1871 struct br_ip src_ip;
1874 hlist_for_each_entry(ent, &pg->src_list, node)
1875 ent->flags |= BR_SGRP_F_DELETE;
1877 memset(&src_ip, 0, sizeof(src_ip));
1878 src_ip.proto = pg->key.addr.proto;
1879 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1880 memcpy(&src_ip.src, srcs, src_size);
1881 ent = br_multicast_find_group_src(pg, &src_ip);
1883 ent->flags &= ~BR_SGRP_F_DELETE;
1885 ent = br_multicast_new_group_src(pg, &src_ip);
1887 __grp_src_mod_timer(ent,
1888 now + br_multicast_gmi(br));
1895 if (__grp_src_delete_marked(pg))
1901 static bool br_multicast_isexc(struct net_bridge_port_group *pg,
1902 void *srcs, u32 nsrcs, size_t src_size)
1904 struct net_bridge *br = pg->key.port->br;
1905 bool changed = false;
1907 switch (pg->filter_mode) {
1909 __grp_src_isexc_incl(pg, srcs, nsrcs, src_size);
1910 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
1914 changed = __grp_src_isexc_excl(pg, srcs, nsrcs, src_size);
1918 pg->filter_mode = MCAST_EXCLUDE;
1919 mod_timer(&pg->timer, jiffies + br_multicast_gmi(br));
1924 /* State Msg type New state Actions
1925 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI
1928 static bool __grp_src_toin_incl(struct net_bridge_port_group *pg,
1929 void *srcs, u32 nsrcs, size_t src_size)
1931 struct net_bridge *br = pg->key.port->br;
1932 u32 src_idx, to_send = pg->src_ents;
1933 struct net_bridge_group_src *ent;
1934 unsigned long now = jiffies;
1935 bool changed = false;
1936 struct br_ip src_ip;
1938 hlist_for_each_entry(ent, &pg->src_list, node)
1939 ent->flags |= BR_SGRP_F_SEND;
1941 memset(&src_ip, 0, sizeof(src_ip));
1942 src_ip.proto = pg->key.addr.proto;
1943 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1944 memcpy(&src_ip.src, srcs, src_size);
1945 ent = br_multicast_find_group_src(pg, &src_ip);
1947 ent->flags &= ~BR_SGRP_F_SEND;
1950 ent = br_multicast_new_group_src(pg, &src_ip);
1955 __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
1960 __grp_src_query_marked_and_rexmit(pg);
1965 /* State Msg type New state Actions
1966 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI
1970 static bool __grp_src_toin_excl(struct net_bridge_port_group *pg,
1971 void *srcs, u32 nsrcs, size_t src_size)
1973 struct net_bridge *br = pg->key.port->br;
1974 u32 src_idx, to_send = pg->src_ents;
1975 struct net_bridge_group_src *ent;
1976 unsigned long now = jiffies;
1977 bool changed = false;
1978 struct br_ip src_ip;
1980 hlist_for_each_entry(ent, &pg->src_list, node)
1981 if (timer_pending(&ent->timer))
1982 ent->flags |= BR_SGRP_F_SEND;
1984 memset(&src_ip, 0, sizeof(src_ip));
1985 src_ip.proto = pg->key.addr.proto;
1986 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1987 memcpy(&src_ip.src, srcs, src_size);
1988 ent = br_multicast_find_group_src(pg, &src_ip);
1990 if (timer_pending(&ent->timer)) {
1991 ent->flags &= ~BR_SGRP_F_SEND;
1995 ent = br_multicast_new_group_src(pg, &src_ip);
2000 __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
2005 __grp_src_query_marked_and_rexmit(pg);
2007 __grp_send_query_and_rexmit(pg);
2012 static bool br_multicast_toin(struct net_bridge_port_group *pg,
2013 void *srcs, u32 nsrcs, size_t src_size)
2015 bool changed = false;
2017 switch (pg->filter_mode) {
2019 changed = __grp_src_toin_incl(pg, srcs, nsrcs, src_size);
2022 changed = __grp_src_toin_excl(pg, srcs, nsrcs, src_size);
2029 /* State Msg type New state Actions
2030 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
2035 static void __grp_src_toex_incl(struct net_bridge_port_group *pg,
2036 void *srcs, u32 nsrcs, size_t src_size)
2038 struct net_bridge_group_src *ent;
2039 u32 src_idx, to_send = 0;
2040 struct br_ip src_ip;
2042 hlist_for_each_entry(ent, &pg->src_list, node)
2043 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2045 memset(&src_ip, 0, sizeof(src_ip));
2046 src_ip.proto = pg->key.addr.proto;
2047 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2048 memcpy(&src_ip.src, srcs, src_size);
2049 ent = br_multicast_find_group_src(pg, &src_ip);
2051 ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) |
2055 ent = br_multicast_new_group_src(pg, &src_ip);
2058 br_multicast_fwd_src_handle(ent);
2062 __grp_src_delete_marked(pg);
2064 __grp_src_query_marked_and_rexmit(pg);
2067 /* State Msg type New state Actions
2068 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer
2074 static bool __grp_src_toex_excl(struct net_bridge_port_group *pg,
2075 void *srcs, u32 nsrcs, size_t src_size)
2077 struct net_bridge_group_src *ent;
2078 u32 src_idx, to_send = 0;
2079 bool changed = false;
2080 struct br_ip src_ip;
2082 hlist_for_each_entry(ent, &pg->src_list, node)
2083 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2085 memset(&src_ip, 0, sizeof(src_ip));
2086 src_ip.proto = pg->key.addr.proto;
2087 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2088 memcpy(&src_ip.src, srcs, src_size);
2089 ent = br_multicast_find_group_src(pg, &src_ip);
2091 ent->flags &= ~BR_SGRP_F_DELETE;
2093 ent = br_multicast_new_group_src(pg, &src_ip);
2095 __grp_src_mod_timer(ent, pg->timer.expires);
2099 if (ent && timer_pending(&ent->timer)) {
2100 ent->flags |= BR_SGRP_F_SEND;
2106 if (__grp_src_delete_marked(pg))
2109 __grp_src_query_marked_and_rexmit(pg);
2114 static bool br_multicast_toex(struct net_bridge_port_group *pg,
2115 void *srcs, u32 nsrcs, size_t src_size)
2117 struct net_bridge *br = pg->key.port->br;
2118 bool changed = false;
2120 switch (pg->filter_mode) {
2122 __grp_src_toex_incl(pg, srcs, nsrcs, src_size);
2123 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
2127 changed = __grp_src_toex_excl(pg, srcs, nsrcs, src_size);
2131 pg->filter_mode = MCAST_EXCLUDE;
2132 mod_timer(&pg->timer, jiffies + br_multicast_gmi(br));
2137 /* State Msg type New state Actions
2138 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B)
2140 static void __grp_src_block_incl(struct net_bridge_port_group *pg,
2141 void *srcs, u32 nsrcs, size_t src_size)
2143 struct net_bridge_group_src *ent;
2144 u32 src_idx, to_send = 0;
2145 struct br_ip src_ip;
2147 hlist_for_each_entry(ent, &pg->src_list, node)
2148 ent->flags &= ~BR_SGRP_F_SEND;
2150 memset(&src_ip, 0, sizeof(src_ip));
2151 src_ip.proto = pg->key.addr.proto;
2152 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2153 memcpy(&src_ip.src, srcs, src_size);
2154 ent = br_multicast_find_group_src(pg, &src_ip);
2156 ent->flags |= BR_SGRP_F_SEND;
2163 __grp_src_query_marked_and_rexmit(pg);
2165 if (pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list))
2166 br_multicast_find_del_pg(pg->key.port->br, pg);
2169 /* State Msg type New state Actions
2170 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer
2173 static bool __grp_src_block_excl(struct net_bridge_port_group *pg,
2174 void *srcs, u32 nsrcs, size_t src_size)
2176 struct net_bridge_group_src *ent;
2177 u32 src_idx, to_send = 0;
2178 bool changed = false;
2179 struct br_ip src_ip;
2181 hlist_for_each_entry(ent, &pg->src_list, node)
2182 ent->flags &= ~BR_SGRP_F_SEND;
2184 memset(&src_ip, 0, sizeof(src_ip));
2185 src_ip.proto = pg->key.addr.proto;
2186 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2187 memcpy(&src_ip.src, srcs, src_size);
2188 ent = br_multicast_find_group_src(pg, &src_ip);
2190 ent = br_multicast_new_group_src(pg, &src_ip);
2192 __grp_src_mod_timer(ent, pg->timer.expires);
2196 if (ent && timer_pending(&ent->timer)) {
2197 ent->flags |= BR_SGRP_F_SEND;
2204 __grp_src_query_marked_and_rexmit(pg);
2209 static bool br_multicast_block(struct net_bridge_port_group *pg,
2210 void *srcs, u32 nsrcs, size_t src_size)
2212 bool changed = false;
2214 switch (pg->filter_mode) {
2216 __grp_src_block_incl(pg, srcs, nsrcs, src_size);
2219 changed = __grp_src_block_excl(pg, srcs, nsrcs, src_size);
2226 static struct net_bridge_port_group *
2227 br_multicast_find_port(struct net_bridge_mdb_entry *mp,
2228 struct net_bridge_port *p,
2229 const unsigned char *src)
2231 struct net_bridge *br __maybe_unused = mp->br;
2232 struct net_bridge_port_group *pg;
2234 for (pg = mlock_dereference(mp->ports, br);
2236 pg = mlock_dereference(pg->next, br))
2237 if (br_port_group_equal(pg, p, src))
2243 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
2244 struct net_bridge_port *port,
2245 struct sk_buff *skb,
2248 bool igmpv2 = br->multicast_igmp_version == 2;
2249 struct net_bridge_mdb_entry *mdst;
2250 struct net_bridge_port_group *pg;
2251 const unsigned char *src;
2252 struct igmpv3_report *ih;
2253 struct igmpv3_grec *grec;
2254 int i, len, num, type;
2255 bool changed = false;
2260 ih = igmpv3_report_hdr(skb);
2261 num = ntohs(ih->ngrec);
2262 len = skb_transport_offset(skb) + sizeof(*ih);
2264 for (i = 0; i < num; i++) {
2265 len += sizeof(*grec);
2266 if (!ip_mc_may_pull(skb, len))
2269 grec = (void *)(skb->data + len - sizeof(*grec));
2270 group = grec->grec_mca;
2271 type = grec->grec_type;
2272 nsrcs = ntohs(grec->grec_nsrcs);
2275 if (!ip_mc_may_pull(skb, len))
2279 case IGMPV3_MODE_IS_INCLUDE:
2280 case IGMPV3_MODE_IS_EXCLUDE:
2281 case IGMPV3_CHANGE_TO_INCLUDE:
2282 case IGMPV3_CHANGE_TO_EXCLUDE:
2283 case IGMPV3_ALLOW_NEW_SOURCES:
2284 case IGMPV3_BLOCK_OLD_SOURCES:
2291 src = eth_hdr(skb)->h_source;
2293 (type == IGMPV3_CHANGE_TO_INCLUDE ||
2294 type == IGMPV3_MODE_IS_INCLUDE)) {
2295 if (!port || igmpv2) {
2296 br_ip4_multicast_leave_group(br, port, group, vid, src);
2300 err = br_ip4_multicast_add_group(br, port, group, vid,
2306 if (!port || igmpv2)
2309 spin_lock_bh(&br->multicast_lock);
2310 mdst = br_mdb_ip4_get(br, group, vid);
2312 goto unlock_continue;
2313 pg = br_multicast_find_port(mdst, port, src);
2314 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2315 goto unlock_continue;
2317 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4));
2319 case IGMPV3_ALLOW_NEW_SOURCES:
2320 changed = br_multicast_isinc_allow(pg, grec->grec_src,
2321 nsrcs, sizeof(__be32));
2323 case IGMPV3_MODE_IS_INCLUDE:
2324 changed = br_multicast_isinc_allow(pg, grec->grec_src, nsrcs,
2327 case IGMPV3_MODE_IS_EXCLUDE:
2328 changed = br_multicast_isexc(pg, grec->grec_src, nsrcs,
2331 case IGMPV3_CHANGE_TO_INCLUDE:
2332 changed = br_multicast_toin(pg, grec->grec_src, nsrcs,
2335 case IGMPV3_CHANGE_TO_EXCLUDE:
2336 changed = br_multicast_toex(pg, grec->grec_src, nsrcs,
2339 case IGMPV3_BLOCK_OLD_SOURCES:
2340 changed = br_multicast_block(pg, grec->grec_src, nsrcs,
2345 br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB);
2347 spin_unlock_bh(&br->multicast_lock);
2353 #if IS_ENABLED(CONFIG_IPV6)
2354 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
2355 struct net_bridge_port *port,
2356 struct sk_buff *skb,
2359 bool mldv1 = br->multicast_mld_version == 1;
2360 struct net_bridge_mdb_entry *mdst;
2361 struct net_bridge_port_group *pg;
2362 unsigned int nsrcs_offset;
2363 const unsigned char *src;
2364 struct icmp6hdr *icmp6h;
2365 struct mld2_grec *grec;
2366 unsigned int grec_len;
2367 bool changed = false;
2371 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
2374 icmp6h = icmp6_hdr(skb);
2375 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
2376 len = skb_transport_offset(skb) + sizeof(*icmp6h);
2378 for (i = 0; i < num; i++) {
2379 __be16 *_nsrcs, __nsrcs;
2382 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
2384 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
2385 nsrcs_offset + sizeof(__nsrcs))
2388 _nsrcs = skb_header_pointer(skb, nsrcs_offset,
2389 sizeof(__nsrcs), &__nsrcs);
2393 nsrcs = ntohs(*_nsrcs);
2394 grec_len = struct_size(grec, grec_src, nsrcs);
2396 if (!ipv6_mc_may_pull(skb, len + grec_len))
2399 grec = (struct mld2_grec *)(skb->data + len);
2402 switch (grec->grec_type) {
2403 case MLD2_MODE_IS_INCLUDE:
2404 case MLD2_MODE_IS_EXCLUDE:
2405 case MLD2_CHANGE_TO_INCLUDE:
2406 case MLD2_CHANGE_TO_EXCLUDE:
2407 case MLD2_ALLOW_NEW_SOURCES:
2408 case MLD2_BLOCK_OLD_SOURCES:
2415 src = eth_hdr(skb)->h_source;
2416 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
2417 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
2419 if (!port || mldv1) {
2420 br_ip6_multicast_leave_group(br, port,
2426 err = br_ip6_multicast_add_group(br, port,
2427 &grec->grec_mca, vid,
2436 spin_lock_bh(&br->multicast_lock);
2437 mdst = br_mdb_ip6_get(br, &grec->grec_mca, vid);
2439 goto unlock_continue;
2440 pg = br_multicast_find_port(mdst, port, src);
2441 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2442 goto unlock_continue;
2443 switch (grec->grec_type) {
2444 case MLD2_ALLOW_NEW_SOURCES:
2445 changed = br_multicast_isinc_allow(pg, grec->grec_src,
2447 sizeof(struct in6_addr));
2449 case MLD2_MODE_IS_INCLUDE:
2450 changed = br_multicast_isinc_allow(pg, grec->grec_src, nsrcs,
2451 sizeof(struct in6_addr));
2453 case MLD2_MODE_IS_EXCLUDE:
2454 changed = br_multicast_isexc(pg, grec->grec_src, nsrcs,
2455 sizeof(struct in6_addr));
2457 case MLD2_CHANGE_TO_INCLUDE:
2458 changed = br_multicast_toin(pg, grec->grec_src, nsrcs,
2459 sizeof(struct in6_addr));
2461 case MLD2_CHANGE_TO_EXCLUDE:
2462 changed = br_multicast_toex(pg, grec->grec_src, nsrcs,
2463 sizeof(struct in6_addr));
2465 case MLD2_BLOCK_OLD_SOURCES:
2466 changed = br_multicast_block(pg, grec->grec_src, nsrcs,
2467 sizeof(struct in6_addr));
2471 br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB);
2473 spin_unlock_bh(&br->multicast_lock);
2480 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
2481 struct net_bridge_port *port,
2484 if (!timer_pending(&br->ip4_own_query.timer) &&
2485 !timer_pending(&br->ip4_other_query.timer))
2488 if (!br->ip4_querier.addr.src.ip4)
2491 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.src.ip4))
2497 br->ip4_querier.addr.src.ip4 = saddr;
2499 /* update protected by general multicast_lock by caller */
2500 rcu_assign_pointer(br->ip4_querier.port, port);
2505 #if IS_ENABLED(CONFIG_IPV6)
2506 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
2507 struct net_bridge_port *port,
2508 struct in6_addr *saddr)
2510 if (!timer_pending(&br->ip6_own_query.timer) &&
2511 !timer_pending(&br->ip6_other_query.timer))
2514 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.src.ip6) <= 0)
2520 br->ip6_querier.addr.src.ip6 = *saddr;
2522 /* update protected by general multicast_lock by caller */
2523 rcu_assign_pointer(br->ip6_querier.port, port);
2529 static bool br_multicast_select_querier(struct net_bridge *br,
2530 struct net_bridge_port *port,
2531 struct br_ip *saddr)
2533 switch (saddr->proto) {
2534 case htons(ETH_P_IP):
2535 return br_ip4_multicast_select_querier(br, port, saddr->src.ip4);
2536 #if IS_ENABLED(CONFIG_IPV6)
2537 case htons(ETH_P_IPV6):
2538 return br_ip6_multicast_select_querier(br, port, &saddr->src.ip6);
2546 br_multicast_update_query_timer(struct net_bridge *br,
2547 struct bridge_mcast_other_query *query,
2548 unsigned long max_delay)
2550 if (!timer_pending(&query->timer))
2551 query->delay_time = jiffies + max_delay;
2553 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
2556 static void br_port_mc_router_state_change(struct net_bridge_port *p,
2559 struct switchdev_attr attr = {
2561 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
2562 .flags = SWITCHDEV_F_DEFER,
2563 .u.mrouter = is_mc_router,
2566 switchdev_port_attr_set(p->dev, &attr);
2570 * Add port to router_list
2571 * list is maintained ordered by pointer value
2572 * and locked by br->multicast_lock and RCU
2574 static void br_multicast_add_router(struct net_bridge *br,
2575 struct net_bridge_port *port)
2577 struct net_bridge_port *p;
2578 struct hlist_node *slot = NULL;
2580 if (!hlist_unhashed(&port->rlist))
2583 hlist_for_each_entry(p, &br->router_list, rlist) {
2584 if ((unsigned long) port >= (unsigned long) p)
2590 hlist_add_behind_rcu(&port->rlist, slot);
2592 hlist_add_head_rcu(&port->rlist, &br->router_list);
2593 br_rtr_notify(br->dev, port, RTM_NEWMDB);
2594 br_port_mc_router_state_change(port, true);
2597 static void br_multicast_mark_router(struct net_bridge *br,
2598 struct net_bridge_port *port)
2600 unsigned long now = jiffies;
2603 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
2604 if (!timer_pending(&br->multicast_router_timer))
2605 br_mc_router_state_change(br, true);
2606 mod_timer(&br->multicast_router_timer,
2607 now + br->multicast_querier_interval);
2612 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
2613 port->multicast_router == MDB_RTR_TYPE_PERM)
2616 br_multicast_add_router(br, port);
2618 mod_timer(&port->multicast_router_timer,
2619 now + br->multicast_querier_interval);
2622 static void br_multicast_query_received(struct net_bridge *br,
2623 struct net_bridge_port *port,
2624 struct bridge_mcast_other_query *query,
2625 struct br_ip *saddr,
2626 unsigned long max_delay)
2628 if (!br_multicast_select_querier(br, port, saddr))
2631 br_multicast_update_query_timer(br, query, max_delay);
2632 br_multicast_mark_router(br, port);
2635 static void br_ip4_multicast_query(struct net_bridge *br,
2636 struct net_bridge_port *port,
2637 struct sk_buff *skb,
2640 unsigned int transport_len = ip_transport_len(skb);
2641 const struct iphdr *iph = ip_hdr(skb);
2642 struct igmphdr *ih = igmp_hdr(skb);
2643 struct net_bridge_mdb_entry *mp;
2644 struct igmpv3_query *ih3;
2645 struct net_bridge_port_group *p;
2646 struct net_bridge_port_group __rcu **pp;
2648 unsigned long max_delay;
2649 unsigned long now = jiffies;
2652 spin_lock(&br->multicast_lock);
2653 if (!netif_running(br->dev) ||
2654 (port && port->state == BR_STATE_DISABLED))
2659 if (transport_len == sizeof(*ih)) {
2660 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
2663 max_delay = 10 * HZ;
2666 } else if (transport_len >= sizeof(*ih3)) {
2667 ih3 = igmpv3_query_hdr(skb);
2669 (br->multicast_igmp_version == 3 && group && ih3->suppress))
2672 max_delay = ih3->code ?
2673 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
2679 saddr.proto = htons(ETH_P_IP);
2680 saddr.src.ip4 = iph->saddr;
2682 br_multicast_query_received(br, port, &br->ip4_other_query,
2687 mp = br_mdb_ip4_get(br, group, vid);
2691 max_delay *= br->multicast_last_member_count;
2693 if (mp->host_joined &&
2694 (timer_pending(&mp->timer) ?
2695 time_after(mp->timer.expires, now + max_delay) :
2696 try_to_del_timer_sync(&mp->timer) >= 0))
2697 mod_timer(&mp->timer, now + max_delay);
2699 for (pp = &mp->ports;
2700 (p = mlock_dereference(*pp, br)) != NULL;
2702 if (timer_pending(&p->timer) ?
2703 time_after(p->timer.expires, now + max_delay) :
2704 try_to_del_timer_sync(&p->timer) >= 0 &&
2705 (br->multicast_igmp_version == 2 ||
2706 p->filter_mode == MCAST_EXCLUDE))
2707 mod_timer(&p->timer, now + max_delay);
2711 spin_unlock(&br->multicast_lock);
2714 #if IS_ENABLED(CONFIG_IPV6)
2715 static int br_ip6_multicast_query(struct net_bridge *br,
2716 struct net_bridge_port *port,
2717 struct sk_buff *skb,
2720 unsigned int transport_len = ipv6_transport_len(skb);
2721 struct mld_msg *mld;
2722 struct net_bridge_mdb_entry *mp;
2723 struct mld2_query *mld2q;
2724 struct net_bridge_port_group *p;
2725 struct net_bridge_port_group __rcu **pp;
2727 unsigned long max_delay;
2728 unsigned long now = jiffies;
2729 unsigned int offset = skb_transport_offset(skb);
2730 const struct in6_addr *group = NULL;
2731 bool is_general_query;
2734 spin_lock(&br->multicast_lock);
2735 if (!netif_running(br->dev) ||
2736 (port && port->state == BR_STATE_DISABLED))
2739 if (transport_len == sizeof(*mld)) {
2740 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
2744 mld = (struct mld_msg *) icmp6_hdr(skb);
2745 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
2747 group = &mld->mld_mca;
2749 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
2753 mld2q = (struct mld2_query *)icmp6_hdr(skb);
2754 if (!mld2q->mld2q_nsrcs)
2755 group = &mld2q->mld2q_mca;
2756 if (br->multicast_mld_version == 2 &&
2757 !ipv6_addr_any(&mld2q->mld2q_mca) &&
2758 mld2q->mld2q_suppress)
2761 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
2764 is_general_query = group && ipv6_addr_any(group);
2766 if (is_general_query) {
2767 saddr.proto = htons(ETH_P_IPV6);
2768 saddr.src.ip6 = ipv6_hdr(skb)->saddr;
2770 br_multicast_query_received(br, port, &br->ip6_other_query,
2773 } else if (!group) {
2777 mp = br_mdb_ip6_get(br, group, vid);
2781 max_delay *= br->multicast_last_member_count;
2782 if (mp->host_joined &&
2783 (timer_pending(&mp->timer) ?
2784 time_after(mp->timer.expires, now + max_delay) :
2785 try_to_del_timer_sync(&mp->timer) >= 0))
2786 mod_timer(&mp->timer, now + max_delay);
2788 for (pp = &mp->ports;
2789 (p = mlock_dereference(*pp, br)) != NULL;
2791 if (timer_pending(&p->timer) ?
2792 time_after(p->timer.expires, now + max_delay) :
2793 try_to_del_timer_sync(&p->timer) >= 0 &&
2794 (br->multicast_mld_version == 1 ||
2795 p->filter_mode == MCAST_EXCLUDE))
2796 mod_timer(&p->timer, now + max_delay);
2800 spin_unlock(&br->multicast_lock);
2806 br_multicast_leave_group(struct net_bridge *br,
2807 struct net_bridge_port *port,
2808 struct br_ip *group,
2809 struct bridge_mcast_other_query *other_query,
2810 struct bridge_mcast_own_query *own_query,
2811 const unsigned char *src)
2813 struct net_bridge_mdb_entry *mp;
2814 struct net_bridge_port_group *p;
2818 spin_lock(&br->multicast_lock);
2819 if (!netif_running(br->dev) ||
2820 (port && port->state == BR_STATE_DISABLED))
2823 mp = br_mdb_ip_get(br, group);
2827 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
2828 struct net_bridge_port_group __rcu **pp;
2830 for (pp = &mp->ports;
2831 (p = mlock_dereference(*pp, br)) != NULL;
2833 if (!br_port_group_equal(p, port, src))
2836 if (p->flags & MDB_PG_FLAGS_PERMANENT)
2839 p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
2840 br_multicast_del_pg(mp, p, pp);
2845 if (timer_pending(&other_query->timer))
2848 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
2849 __br_multicast_send_query(br, port, NULL, NULL, &mp->addr,
2852 time = jiffies + br->multicast_last_member_count *
2853 br->multicast_last_member_interval;
2855 mod_timer(&own_query->timer, time);
2857 for (p = mlock_dereference(mp->ports, br);
2859 p = mlock_dereference(p->next, br)) {
2860 if (!br_port_group_equal(p, port, src))
2863 if (!hlist_unhashed(&p->mglist) &&
2864 (timer_pending(&p->timer) ?
2865 time_after(p->timer.expires, time) :
2866 try_to_del_timer_sync(&p->timer) >= 0)) {
2867 mod_timer(&p->timer, time);
2875 time = now + br->multicast_last_member_count *
2876 br->multicast_last_member_interval;
2879 if (mp->host_joined &&
2880 (timer_pending(&mp->timer) ?
2881 time_after(mp->timer.expires, time) :
2882 try_to_del_timer_sync(&mp->timer) >= 0)) {
2883 mod_timer(&mp->timer, time);
2889 for (p = mlock_dereference(mp->ports, br);
2891 p = mlock_dereference(p->next, br)) {
2892 if (p->key.port != port)
2895 if (!hlist_unhashed(&p->mglist) &&
2896 (timer_pending(&p->timer) ?
2897 time_after(p->timer.expires, time) :
2898 try_to_del_timer_sync(&p->timer) >= 0)) {
2899 mod_timer(&p->timer, time);
2905 spin_unlock(&br->multicast_lock);
2908 static void br_ip4_multicast_leave_group(struct net_bridge *br,
2909 struct net_bridge_port *port,
2912 const unsigned char *src)
2914 struct br_ip br_group;
2915 struct bridge_mcast_own_query *own_query;
2917 if (ipv4_is_local_multicast(group))
2920 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
2922 memset(&br_group, 0, sizeof(br_group));
2923 br_group.dst.ip4 = group;
2924 br_group.proto = htons(ETH_P_IP);
2927 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
2931 #if IS_ENABLED(CONFIG_IPV6)
2932 static void br_ip6_multicast_leave_group(struct net_bridge *br,
2933 struct net_bridge_port *port,
2934 const struct in6_addr *group,
2936 const unsigned char *src)
2938 struct br_ip br_group;
2939 struct bridge_mcast_own_query *own_query;
2941 if (ipv6_addr_is_ll_all_nodes(group))
2944 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
2946 memset(&br_group, 0, sizeof(br_group));
2947 br_group.dst.ip6 = *group;
2948 br_group.proto = htons(ETH_P_IPV6);
2951 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
2956 static void br_multicast_err_count(const struct net_bridge *br,
2957 const struct net_bridge_port *p,
2960 struct bridge_mcast_stats __percpu *stats;
2961 struct bridge_mcast_stats *pstats;
2963 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2967 stats = p->mcast_stats;
2969 stats = br->mcast_stats;
2970 if (WARN_ON(!stats))
2973 pstats = this_cpu_ptr(stats);
2975 u64_stats_update_begin(&pstats->syncp);
2977 case htons(ETH_P_IP):
2978 pstats->mstats.igmp_parse_errors++;
2980 #if IS_ENABLED(CONFIG_IPV6)
2981 case htons(ETH_P_IPV6):
2982 pstats->mstats.mld_parse_errors++;
2986 u64_stats_update_end(&pstats->syncp);
2989 static void br_multicast_pim(struct net_bridge *br,
2990 struct net_bridge_port *port,
2991 const struct sk_buff *skb)
2993 unsigned int offset = skb_transport_offset(skb);
2994 struct pimhdr *pimhdr, _pimhdr;
2996 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
2997 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
2998 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
3001 br_multicast_mark_router(br, port);
3004 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
3005 struct net_bridge_port *port,
3006 struct sk_buff *skb)
3008 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
3009 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
3012 br_multicast_mark_router(br, port);
3017 static int br_multicast_ipv4_rcv(struct net_bridge *br,
3018 struct net_bridge_port *port,
3019 struct sk_buff *skb,
3022 const unsigned char *src;
3026 err = ip_mc_check_igmp(skb);
3028 if (err == -ENOMSG) {
3029 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
3030 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3031 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
3032 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
3033 br_multicast_pim(br, port, skb);
3034 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
3035 br_ip4_multicast_mrd_rcv(br, port, skb);
3039 } else if (err < 0) {
3040 br_multicast_err_count(br, port, skb->protocol);
3045 src = eth_hdr(skb)->h_source;
3046 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
3049 case IGMP_HOST_MEMBERSHIP_REPORT:
3050 case IGMPV2_HOST_MEMBERSHIP_REPORT:
3051 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3052 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src,
3055 case IGMPV3_HOST_MEMBERSHIP_REPORT:
3056 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
3058 case IGMP_HOST_MEMBERSHIP_QUERY:
3059 br_ip4_multicast_query(br, port, skb, vid);
3061 case IGMP_HOST_LEAVE_MESSAGE:
3062 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
3066 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
3072 #if IS_ENABLED(CONFIG_IPV6)
3073 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
3074 struct net_bridge_port *port,
3075 struct sk_buff *skb)
3079 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
3082 ret = ipv6_mc_check_icmpv6(skb);
3086 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
3089 br_multicast_mark_router(br, port);
3094 static int br_multicast_ipv6_rcv(struct net_bridge *br,
3095 struct net_bridge_port *port,
3096 struct sk_buff *skb,
3099 const unsigned char *src;
3100 struct mld_msg *mld;
3103 err = ipv6_mc_check_mld(skb);
3105 if (err == -ENOMSG) {
3106 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
3107 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3109 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
3110 err = br_ip6_multicast_mrd_rcv(br, port, skb);
3112 if (err < 0 && err != -ENOMSG) {
3113 br_multicast_err_count(br, port, skb->protocol);
3119 } else if (err < 0) {
3120 br_multicast_err_count(br, port, skb->protocol);
3124 mld = (struct mld_msg *)skb_transport_header(skb);
3125 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
3127 switch (mld->mld_type) {
3128 case ICMPV6_MGM_REPORT:
3129 src = eth_hdr(skb)->h_source;
3130 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3131 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
3134 case ICMPV6_MLD2_REPORT:
3135 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
3137 case ICMPV6_MGM_QUERY:
3138 err = br_ip6_multicast_query(br, port, skb, vid);
3140 case ICMPV6_MGM_REDUCTION:
3141 src = eth_hdr(skb)->h_source;
3142 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
3146 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
3153 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
3154 struct sk_buff *skb, u16 vid)
3158 BR_INPUT_SKB_CB(skb)->igmp = 0;
3159 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
3161 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
3164 switch (skb->protocol) {
3165 case htons(ETH_P_IP):
3166 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
3168 #if IS_ENABLED(CONFIG_IPV6)
3169 case htons(ETH_P_IPV6):
3170 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
3178 static void br_multicast_query_expired(struct net_bridge *br,
3179 struct bridge_mcast_own_query *query,
3180 struct bridge_mcast_querier *querier)
3182 spin_lock(&br->multicast_lock);
3183 if (query->startup_sent < br->multicast_startup_query_count)
3184 query->startup_sent++;
3186 RCU_INIT_POINTER(querier->port, NULL);
3187 br_multicast_send_query(br, NULL, query);
3188 spin_unlock(&br->multicast_lock);
3191 static void br_ip4_multicast_query_expired(struct timer_list *t)
3193 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
3195 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
3198 #if IS_ENABLED(CONFIG_IPV6)
3199 static void br_ip6_multicast_query_expired(struct timer_list *t)
3201 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
3203 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
3207 static void br_multicast_gc_work(struct work_struct *work)
3209 struct net_bridge *br = container_of(work, struct net_bridge,
3211 HLIST_HEAD(deleted_head);
3213 spin_lock_bh(&br->multicast_lock);
3214 hlist_move_list(&br->mcast_gc_list, &deleted_head);
3215 spin_unlock_bh(&br->multicast_lock);
3217 br_multicast_gc(&deleted_head);
3220 void br_multicast_init(struct net_bridge *br)
3222 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
3224 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
3225 br->multicast_last_member_count = 2;
3226 br->multicast_startup_query_count = 2;
3228 br->multicast_last_member_interval = HZ;
3229 br->multicast_query_response_interval = 10 * HZ;
3230 br->multicast_startup_query_interval = 125 * HZ / 4;
3231 br->multicast_query_interval = 125 * HZ;
3232 br->multicast_querier_interval = 255 * HZ;
3233 br->multicast_membership_interval = 260 * HZ;
3235 br->ip4_other_query.delay_time = 0;
3236 br->ip4_querier.port = NULL;
3237 br->multicast_igmp_version = 2;
3238 #if IS_ENABLED(CONFIG_IPV6)
3239 br->multicast_mld_version = 1;
3240 br->ip6_other_query.delay_time = 0;
3241 br->ip6_querier.port = NULL;
3243 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
3244 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
3246 spin_lock_init(&br->multicast_lock);
3247 timer_setup(&br->multicast_router_timer,
3248 br_multicast_local_router_expired, 0);
3249 timer_setup(&br->ip4_other_query.timer,
3250 br_ip4_multicast_querier_expired, 0);
3251 timer_setup(&br->ip4_own_query.timer,
3252 br_ip4_multicast_query_expired, 0);
3253 #if IS_ENABLED(CONFIG_IPV6)
3254 timer_setup(&br->ip6_other_query.timer,
3255 br_ip6_multicast_querier_expired, 0);
3256 timer_setup(&br->ip6_own_query.timer,
3257 br_ip6_multicast_query_expired, 0);
3259 INIT_HLIST_HEAD(&br->mdb_list);
3260 INIT_HLIST_HEAD(&br->mcast_gc_list);
3261 INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work);
3264 static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
3266 struct in_device *in_dev = in_dev_get(br->dev);
3271 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
3275 #if IS_ENABLED(CONFIG_IPV6)
3276 static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
3278 struct in6_addr addr;
3280 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
3281 ipv6_dev_mc_inc(br->dev, &addr);
3284 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
3289 static void br_multicast_join_snoopers(struct net_bridge *br)
3291 br_ip4_multicast_join_snoopers(br);
3292 br_ip6_multicast_join_snoopers(br);
3295 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
3297 struct in_device *in_dev = in_dev_get(br->dev);
3299 if (WARN_ON(!in_dev))
3302 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
3306 #if IS_ENABLED(CONFIG_IPV6)
3307 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
3309 struct in6_addr addr;
3311 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
3312 ipv6_dev_mc_dec(br->dev, &addr);
3315 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
3320 static void br_multicast_leave_snoopers(struct net_bridge *br)
3322 br_ip4_multicast_leave_snoopers(br);
3323 br_ip6_multicast_leave_snoopers(br);
3326 static void __br_multicast_open(struct net_bridge *br,
3327 struct bridge_mcast_own_query *query)
3329 query->startup_sent = 0;
3331 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
3334 mod_timer(&query->timer, jiffies);
3337 void br_multicast_open(struct net_bridge *br)
3339 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
3340 br_multicast_join_snoopers(br);
3342 __br_multicast_open(br, &br->ip4_own_query);
3343 #if IS_ENABLED(CONFIG_IPV6)
3344 __br_multicast_open(br, &br->ip6_own_query);
3348 void br_multicast_stop(struct net_bridge *br)
3350 del_timer_sync(&br->multicast_router_timer);
3351 del_timer_sync(&br->ip4_other_query.timer);
3352 del_timer_sync(&br->ip4_own_query.timer);
3353 #if IS_ENABLED(CONFIG_IPV6)
3354 del_timer_sync(&br->ip6_other_query.timer);
3355 del_timer_sync(&br->ip6_own_query.timer);
3358 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
3359 br_multicast_leave_snoopers(br);
3362 void br_multicast_dev_del(struct net_bridge *br)
3364 struct net_bridge_mdb_entry *mp;
3365 HLIST_HEAD(deleted_head);
3366 struct hlist_node *tmp;
3368 spin_lock_bh(&br->multicast_lock);
3369 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node)
3370 br_multicast_del_mdb_entry(mp);
3371 hlist_move_list(&br->mcast_gc_list, &deleted_head);
3372 spin_unlock_bh(&br->multicast_lock);
3374 br_multicast_gc(&deleted_head);
3375 cancel_work_sync(&br->mcast_gc_work);
3380 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
3384 spin_lock_bh(&br->multicast_lock);
3387 case MDB_RTR_TYPE_DISABLED:
3388 case MDB_RTR_TYPE_PERM:
3389 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
3390 del_timer(&br->multicast_router_timer);
3391 br->multicast_router = val;
3394 case MDB_RTR_TYPE_TEMP_QUERY:
3395 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
3396 br_mc_router_state_change(br, false);
3397 br->multicast_router = val;
3402 spin_unlock_bh(&br->multicast_lock);
3407 static void __del_port_router(struct net_bridge_port *p)
3409 if (hlist_unhashed(&p->rlist))
3411 hlist_del_init_rcu(&p->rlist);
3412 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
3413 br_port_mc_router_state_change(p, false);
3415 /* don't allow timer refresh */
3416 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
3417 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
3420 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
3422 struct net_bridge *br = p->br;
3423 unsigned long now = jiffies;
3426 spin_lock(&br->multicast_lock);
3427 if (p->multicast_router == val) {
3428 /* Refresh the temp router port timer */
3429 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
3430 mod_timer(&p->multicast_router_timer,
3431 now + br->multicast_querier_interval);
3436 case MDB_RTR_TYPE_DISABLED:
3437 p->multicast_router = MDB_RTR_TYPE_DISABLED;
3438 __del_port_router(p);
3439 del_timer(&p->multicast_router_timer);
3441 case MDB_RTR_TYPE_TEMP_QUERY:
3442 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
3443 __del_port_router(p);
3445 case MDB_RTR_TYPE_PERM:
3446 p->multicast_router = MDB_RTR_TYPE_PERM;
3447 del_timer(&p->multicast_router_timer);
3448 br_multicast_add_router(br, p);
3450 case MDB_RTR_TYPE_TEMP:
3451 p->multicast_router = MDB_RTR_TYPE_TEMP;
3452 br_multicast_mark_router(br, p);
3459 spin_unlock(&br->multicast_lock);
3464 static void br_multicast_start_querier(struct net_bridge *br,
3465 struct bridge_mcast_own_query *query)
3467 struct net_bridge_port *port;
3469 __br_multicast_open(br, query);
3472 list_for_each_entry_rcu(port, &br->port_list, list) {
3473 if (port->state == BR_STATE_DISABLED ||
3474 port->state == BR_STATE_BLOCKING)
3477 if (query == &br->ip4_own_query)
3478 br_multicast_enable(&port->ip4_own_query);
3479 #if IS_ENABLED(CONFIG_IPV6)
3481 br_multicast_enable(&port->ip6_own_query);
3487 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
3489 struct net_bridge_port *port;
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 br_multicast_leave_snoopers(br);
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);
3510 spin_unlock_bh(&br->multicast_lock);
3515 bool br_multicast_enabled(const struct net_device *dev)
3517 struct net_bridge *br = netdev_priv(dev);
3519 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
3521 EXPORT_SYMBOL_GPL(br_multicast_enabled);
3523 bool br_multicast_router(const struct net_device *dev)
3525 struct net_bridge *br = netdev_priv(dev);
3528 spin_lock_bh(&br->multicast_lock);
3529 is_router = br_multicast_is_router(br);
3530 spin_unlock_bh(&br->multicast_lock);
3533 EXPORT_SYMBOL_GPL(br_multicast_router);
3535 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
3537 unsigned long max_delay;
3541 spin_lock_bh(&br->multicast_lock);
3542 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
3545 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
3549 max_delay = br->multicast_query_response_interval;
3551 if (!timer_pending(&br->ip4_other_query.timer))
3552 br->ip4_other_query.delay_time = jiffies + max_delay;
3554 br_multicast_start_querier(br, &br->ip4_own_query);
3556 #if IS_ENABLED(CONFIG_IPV6)
3557 if (!timer_pending(&br->ip6_other_query.timer))
3558 br->ip6_other_query.delay_time = jiffies + max_delay;
3560 br_multicast_start_querier(br, &br->ip6_own_query);
3564 spin_unlock_bh(&br->multicast_lock);
3569 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
3571 /* Currently we support only version 2 and 3 */
3580 spin_lock_bh(&br->multicast_lock);
3581 br->multicast_igmp_version = val;
3582 spin_unlock_bh(&br->multicast_lock);
3587 #if IS_ENABLED(CONFIG_IPV6)
3588 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
3590 /* Currently we support version 1 and 2 */
3599 spin_lock_bh(&br->multicast_lock);
3600 br->multicast_mld_version = val;
3601 spin_unlock_bh(&br->multicast_lock);
3608 * br_multicast_list_adjacent - Returns snooped multicast addresses
3609 * @dev: The bridge port adjacent to which to retrieve addresses
3610 * @br_ip_list: The list to store found, snooped multicast IP addresses in
3612 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
3613 * snooping feature on all bridge ports of dev's bridge device, excluding
3614 * the addresses from dev itself.
3616 * Returns the number of items added to br_ip_list.
3619 * - br_ip_list needs to be initialized by caller
3620 * - br_ip_list might contain duplicates in the end
3621 * (needs to be taken care of by caller)
3622 * - br_ip_list needs to be freed by caller
3624 int br_multicast_list_adjacent(struct net_device *dev,
3625 struct list_head *br_ip_list)
3627 struct net_bridge *br;
3628 struct net_bridge_port *port;
3629 struct net_bridge_port_group *group;
3630 struct br_ip_list *entry;
3634 if (!br_ip_list || !netif_is_bridge_port(dev))
3637 port = br_port_get_rcu(dev);
3638 if (!port || !port->br)
3643 list_for_each_entry_rcu(port, &br->port_list, list) {
3644 if (!port->dev || port->dev == dev)
3647 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
3648 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
3652 entry->addr = group->key.addr;
3653 list_add(&entry->list, br_ip_list);
3662 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
3665 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
3666 * @dev: The bridge port providing the bridge on which to check for a querier
3667 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
3669 * Checks whether the given interface has a bridge on top and if so returns
3670 * true if a valid querier exists anywhere on the bridged link layer.
3671 * Otherwise returns false.
3673 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
3675 struct net_bridge *br;
3676 struct net_bridge_port *port;
3681 if (!netif_is_bridge_port(dev))
3684 port = br_port_get_rcu(dev);
3685 if (!port || !port->br)
3690 memset(ð, 0, sizeof(eth));
3691 eth.h_proto = htons(proto);
3693 ret = br_multicast_querier_exists(br, ð);
3699 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
3702 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
3703 * @dev: The bridge port adjacent to which to check for a querier
3704 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
3706 * Checks whether the given interface has a bridge on top and if so returns
3707 * true if a selected querier is behind one of the other ports of this
3708 * bridge. Otherwise returns false.
3710 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
3712 struct net_bridge *br;
3713 struct net_bridge_port *port;
3717 if (!netif_is_bridge_port(dev))
3720 port = br_port_get_rcu(dev);
3721 if (!port || !port->br)
3728 if (!timer_pending(&br->ip4_other_query.timer) ||
3729 rcu_dereference(br->ip4_querier.port) == port)
3732 #if IS_ENABLED(CONFIG_IPV6)
3734 if (!timer_pending(&br->ip6_other_query.timer) ||
3735 rcu_dereference(br->ip6_querier.port) == port)
3748 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
3750 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
3751 const struct sk_buff *skb, u8 type, u8 dir)
3753 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
3754 __be16 proto = skb->protocol;
3757 u64_stats_update_begin(&pstats->syncp);
3759 case htons(ETH_P_IP):
3760 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
3762 case IGMP_HOST_MEMBERSHIP_REPORT:
3763 pstats->mstats.igmp_v1reports[dir]++;
3765 case IGMPV2_HOST_MEMBERSHIP_REPORT:
3766 pstats->mstats.igmp_v2reports[dir]++;
3768 case IGMPV3_HOST_MEMBERSHIP_REPORT:
3769 pstats->mstats.igmp_v3reports[dir]++;
3771 case IGMP_HOST_MEMBERSHIP_QUERY:
3772 if (t_len != sizeof(struct igmphdr)) {
3773 pstats->mstats.igmp_v3queries[dir]++;
3775 unsigned int offset = skb_transport_offset(skb);
3776 struct igmphdr *ih, _ihdr;
3778 ih = skb_header_pointer(skb, offset,
3779 sizeof(_ihdr), &_ihdr);
3783 pstats->mstats.igmp_v1queries[dir]++;
3785 pstats->mstats.igmp_v2queries[dir]++;
3788 case IGMP_HOST_LEAVE_MESSAGE:
3789 pstats->mstats.igmp_leaves[dir]++;
3793 #if IS_ENABLED(CONFIG_IPV6)
3794 case htons(ETH_P_IPV6):
3795 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
3796 sizeof(struct ipv6hdr);
3797 t_len -= skb_network_header_len(skb);
3799 case ICMPV6_MGM_REPORT:
3800 pstats->mstats.mld_v1reports[dir]++;
3802 case ICMPV6_MLD2_REPORT:
3803 pstats->mstats.mld_v2reports[dir]++;
3805 case ICMPV6_MGM_QUERY:
3806 if (t_len != sizeof(struct mld_msg))
3807 pstats->mstats.mld_v2queries[dir]++;
3809 pstats->mstats.mld_v1queries[dir]++;
3811 case ICMPV6_MGM_REDUCTION:
3812 pstats->mstats.mld_leaves[dir]++;
3816 #endif /* CONFIG_IPV6 */
3818 u64_stats_update_end(&pstats->syncp);
3821 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
3822 const struct sk_buff *skb, u8 type, u8 dir)
3824 struct bridge_mcast_stats __percpu *stats;
3826 /* if multicast_disabled is true then igmp type can't be set */
3827 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
3831 stats = p->mcast_stats;
3833 stats = br->mcast_stats;
3834 if (WARN_ON(!stats))
3837 br_mcast_stats_add(stats, skb, type, dir);
3840 int br_multicast_init_stats(struct net_bridge *br)
3842 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
3843 if (!br->mcast_stats)
3849 void br_multicast_uninit_stats(struct net_bridge *br)
3851 free_percpu(br->mcast_stats);
3854 /* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */
3855 static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src)
3857 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
3858 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
3861 void br_multicast_get_stats(const struct net_bridge *br,
3862 const struct net_bridge_port *p,
3863 struct br_mcast_stats *dest)
3865 struct bridge_mcast_stats __percpu *stats;
3866 struct br_mcast_stats tdst;
3869 memset(dest, 0, sizeof(*dest));
3871 stats = p->mcast_stats;
3873 stats = br->mcast_stats;
3874 if (WARN_ON(!stats))
3877 memset(&tdst, 0, sizeof(tdst));
3878 for_each_possible_cpu(i) {
3879 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
3880 struct br_mcast_stats temp;
3884 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
3885 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
3886 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
3888 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
3889 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
3890 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
3891 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
3892 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
3893 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
3894 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
3895 tdst.igmp_parse_errors += temp.igmp_parse_errors;
3897 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
3898 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
3899 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
3900 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
3901 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
3902 tdst.mld_parse_errors += temp.mld_parse_errors;
3904 memcpy(dest, &tdst, sizeof(*dest));
3907 int br_mdb_hash_init(struct net_bridge *br)
3911 err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params);
3915 err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
3917 rhashtable_destroy(&br->sg_port_tbl);
3924 void br_mdb_hash_fini(struct net_bridge *br)
3926 rhashtable_destroy(&br->sg_port_tbl);
3927 rhashtable_destroy(&br->mdb_hash_tbl);