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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Bridge multicast support.
- *
- * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
- */
- #include <linux/err.h>
- #include <linux/export.h>
- #include <linux/if_ether.h>
- #include <linux/igmp.h>
- #include <linux/in.h>
- #include <linux/jhash.h>
- #include <linux/kernel.h>
- #include <linux/log2.h>
- #include <linux/netdevice.h>
- #include <linux/netfilter_bridge.h>
- #include <linux/random.h>
- #include <linux/rculist.h>
- #include <linux/skbuff.h>
- #include <linux/slab.h>
- #include <linux/timer.h>
- #include <linux/inetdevice.h>
- #include <linux/mroute.h>
- #include <net/ip.h>
- #include <net/switchdev.h>
- #if IS_ENABLED(CONFIG_IPV6)
- #include <linux/icmpv6.h>
- #include <net/ipv6.h>
- #include <net/mld.h>
- #include <net/ip6_checksum.h>
- #include <net/addrconf.h>
- #endif
- #include "br_private.h"
- static const struct rhashtable_params br_mdb_rht_params = {
- .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
- .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
- .key_len = sizeof(struct br_ip),
- .automatic_shrinking = true,
- };
- static const struct rhashtable_params br_sg_port_rht_params = {
- .head_offset = offsetof(struct net_bridge_port_group, rhnode),
- .key_offset = offsetof(struct net_bridge_port_group, key),
- .key_len = sizeof(struct net_bridge_port_group_sg_key),
- .automatic_shrinking = true,
- };
- static void br_multicast_start_querier(struct net_bridge *br,
- struct bridge_mcast_own_query *query);
- static void br_multicast_add_router(struct net_bridge *br,
- struct net_bridge_port *port);
- static void br_ip4_multicast_leave_group(struct net_bridge *br,
- struct net_bridge_port *port,
- __be32 group,
- __u16 vid,
- const unsigned char *src);
- static void br_multicast_port_group_rexmit(struct timer_list *t);
- static void __del_port_router(struct net_bridge_port *p);
- #if IS_ENABLED(CONFIG_IPV6)
- static void br_ip6_multicast_leave_group(struct net_bridge *br,
- struct net_bridge_port *port,
- const struct in6_addr *group,
- __u16 vid, const unsigned char *src);
- #endif
- static struct net_bridge_port_group *
- __br_multicast_add_group(struct net_bridge *br,
- struct net_bridge_port *port,
- struct br_ip *group,
- const unsigned char *src,
- u8 filter_mode,
- bool igmpv2_mldv1,
- bool blocked);
- static void br_multicast_find_del_pg(struct net_bridge *br,
- struct net_bridge_port_group *pg);
- static struct net_bridge_port_group *
- br_sg_port_find(struct net_bridge *br,
- struct net_bridge_port_group_sg_key *sg_p)
- {
- lockdep_assert_held_once(&br->multicast_lock);
- return rhashtable_lookup_fast(&br->sg_port_tbl, sg_p,
- br_sg_port_rht_params);
- }
- static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
- struct br_ip *dst)
- {
- return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
- }
- struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
- struct br_ip *dst)
- {
- struct net_bridge_mdb_entry *ent;
- lockdep_assert_held_once(&br->multicast_lock);
- rcu_read_lock();
- ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
- rcu_read_unlock();
- return ent;
- }
- static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
- __be32 dst, __u16 vid)
- {
- struct br_ip br_dst;
- memset(&br_dst, 0, sizeof(br_dst));
- br_dst.dst.ip4 = dst;
- br_dst.proto = htons(ETH_P_IP);
- br_dst.vid = vid;
- return br_mdb_ip_get(br, &br_dst);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
- const struct in6_addr *dst,
- __u16 vid)
- {
- struct br_ip br_dst;
- memset(&br_dst, 0, sizeof(br_dst));
- br_dst.dst.ip6 = *dst;
- br_dst.proto = htons(ETH_P_IPV6);
- br_dst.vid = vid;
- return br_mdb_ip_get(br, &br_dst);
- }
- #endif
- struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
- struct sk_buff *skb, u16 vid)
- {
- struct br_ip ip;
- if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
- return NULL;
- if (BR_INPUT_SKB_CB(skb)->igmp)
- return NULL;
- memset(&ip, 0, sizeof(ip));
- ip.proto = skb->protocol;
- ip.vid = vid;
- switch (skb->protocol) {
- case htons(ETH_P_IP):
- ip.dst.ip4 = ip_hdr(skb)->daddr;
- if (br->multicast_igmp_version == 3) {
- struct net_bridge_mdb_entry *mdb;
- ip.src.ip4 = ip_hdr(skb)->saddr;
- mdb = br_mdb_ip_get_rcu(br, &ip);
- if (mdb)
- return mdb;
- ip.src.ip4 = 0;
- }
- break;
- #if IS_ENABLED(CONFIG_IPV6)
- case htons(ETH_P_IPV6):
- ip.dst.ip6 = ipv6_hdr(skb)->daddr;
- if (br->multicast_mld_version == 2) {
- struct net_bridge_mdb_entry *mdb;
- ip.src.ip6 = ipv6_hdr(skb)->saddr;
- mdb = br_mdb_ip_get_rcu(br, &ip);
- if (mdb)
- return mdb;
- memset(&ip.src.ip6, 0, sizeof(ip.src.ip6));
- }
- break;
- #endif
- default:
- return NULL;
- }
- return br_mdb_ip_get_rcu(br, &ip);
- }
- static bool br_port_group_equal(struct net_bridge_port_group *p,
- struct net_bridge_port *port,
- const unsigned char *src)
- {
- if (p->key.port != port)
- return false;
- if (!(port->flags & BR_MULTICAST_TO_UNICAST))
- return true;
- return ether_addr_equal(src, p->eth_addr);
- }
- static void __fwd_add_star_excl(struct net_bridge_port_group *pg,
- struct br_ip *sg_ip)
- {
- struct net_bridge_port_group_sg_key sg_key;
- struct net_bridge *br = pg->key.port->br;
- struct net_bridge_port_group *src_pg;
- memset(&sg_key, 0, sizeof(sg_key));
- sg_key.port = pg->key.port;
- sg_key.addr = *sg_ip;
- if (br_sg_port_find(br, &sg_key))
- return;
- src_pg = __br_multicast_add_group(br, pg->key.port, sg_ip, pg->eth_addr,
- MCAST_INCLUDE, false, false);
- if (IS_ERR_OR_NULL(src_pg) ||
- src_pg->rt_protocol != RTPROT_KERNEL)
- return;
- src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
- }
- static void __fwd_del_star_excl(struct net_bridge_port_group *pg,
- struct br_ip *sg_ip)
- {
- struct net_bridge_port_group_sg_key sg_key;
- struct net_bridge *br = pg->key.port->br;
- struct net_bridge_port_group *src_pg;
- memset(&sg_key, 0, sizeof(sg_key));
- sg_key.port = pg->key.port;
- sg_key.addr = *sg_ip;
- src_pg = br_sg_port_find(br, &sg_key);
- if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) ||
- src_pg->rt_protocol != RTPROT_KERNEL)
- return;
- br_multicast_find_del_pg(br, src_pg);
- }
- /* When a port group transitions to (or is added as) EXCLUDE we need to add it
- * to all other ports' S,G entries which are not blocked by the current group
- * for proper replication, the assumption is that any S,G blocked entries
- * are already added so the S,G,port lookup should skip them.
- * When a port group transitions from EXCLUDE -> INCLUDE mode or is being
- * deleted we need to remove it from all ports' S,G entries where it was
- * automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL).
- */
- void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
- u8 filter_mode)
- {
- struct net_bridge *br = pg->key.port->br;
- struct net_bridge_port_group *pg_lst;
- struct net_bridge_mdb_entry *mp;
- struct br_ip sg_ip;
- if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr)))
- return;
- mp = br_mdb_ip_get(br, &pg->key.addr);
- if (!mp)
- return;
- memset(&sg_ip, 0, sizeof(sg_ip));
- sg_ip = pg->key.addr;
- for (pg_lst = mlock_dereference(mp->ports, br);
- pg_lst;
- pg_lst = mlock_dereference(pg_lst->next, br)) {
- struct net_bridge_group_src *src_ent;
- if (pg_lst == pg)
- continue;
- hlist_for_each_entry(src_ent, &pg_lst->src_list, node) {
- if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
- continue;
- sg_ip.src = src_ent->addr.src;
- switch (filter_mode) {
- case MCAST_INCLUDE:
- __fwd_del_star_excl(pg, &sg_ip);
- break;
- case MCAST_EXCLUDE:
- __fwd_add_star_excl(pg, &sg_ip);
- break;
- }
- }
- }
- }
- /* called when adding a new S,G with host_joined == false by default */
- static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp,
- struct net_bridge_port_group *sg)
- {
- struct net_bridge_mdb_entry *sg_mp;
- if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
- return;
- if (!star_mp->host_joined)
- return;
- sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr);
- if (!sg_mp)
- return;
- sg_mp->host_joined = true;
- }
- /* set the host_joined state of all of *,G's S,G entries */
- static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp)
- {
- struct net_bridge *br = star_mp->br;
- struct net_bridge_mdb_entry *sg_mp;
- struct net_bridge_port_group *pg;
- struct br_ip sg_ip;
- if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
- return;
- memset(&sg_ip, 0, sizeof(sg_ip));
- sg_ip = star_mp->addr;
- for (pg = mlock_dereference(star_mp->ports, br);
- pg;
- pg = mlock_dereference(pg->next, br)) {
- struct net_bridge_group_src *src_ent;
- hlist_for_each_entry(src_ent, &pg->src_list, node) {
- if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
- continue;
- sg_ip.src = src_ent->addr.src;
- sg_mp = br_mdb_ip_get(br, &sg_ip);
- if (!sg_mp)
- continue;
- sg_mp->host_joined = star_mp->host_joined;
- }
- }
- }
- static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp)
- {
- struct net_bridge_port_group __rcu **pp;
- struct net_bridge_port_group *p;
- /* *,G exclude ports are only added to S,G entries */
- if (WARN_ON(br_multicast_is_star_g(&sgmp->addr)))
- return;
- /* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports
- * we should ignore perm entries since they're managed by user-space
- */
- for (pp = &sgmp->ports;
- (p = mlock_dereference(*pp, sgmp->br)) != NULL;
- pp = &p->next)
- if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL |
- MDB_PG_FLAGS_PERMANENT)))
- return;
- /* currently the host can only have joined the *,G which means
- * we treat it as EXCLUDE {}, so for an S,G it's considered a
- * STAR_EXCLUDE entry and we can safely leave it
- */
- sgmp->host_joined = false;
- for (pp = &sgmp->ports;
- (p = mlock_dereference(*pp, sgmp->br)) != NULL;) {
- if (!(p->flags & MDB_PG_FLAGS_PERMANENT))
- br_multicast_del_pg(sgmp, p, pp);
- else
- pp = &p->next;
- }
- }
- void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
- struct net_bridge_port_group *sg)
- {
- struct net_bridge_port_group_sg_key sg_key;
- struct net_bridge *br = star_mp->br;
- struct net_bridge_port_group *pg;
- if (WARN_ON(br_multicast_is_star_g(&sg->key.addr)))
- return;
- if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
- return;
- br_multicast_sg_host_state(star_mp, sg);
- memset(&sg_key, 0, sizeof(sg_key));
- sg_key.addr = sg->key.addr;
- /* we need to add all exclude ports to the S,G */
- for (pg = mlock_dereference(star_mp->ports, br);
- pg;
- pg = mlock_dereference(pg->next, br)) {
- struct net_bridge_port_group *src_pg;
- if (pg == sg || pg->filter_mode == MCAST_INCLUDE)
- continue;
- sg_key.port = pg->key.port;
- if (br_sg_port_find(br, &sg_key))
- continue;
- src_pg = __br_multicast_add_group(br, pg->key.port,
- &sg->key.addr,
- sg->eth_addr,
- MCAST_INCLUDE, false, false);
- if (IS_ERR_OR_NULL(src_pg) ||
- src_pg->rt_protocol != RTPROT_KERNEL)
- continue;
- src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
- }
- }
- static void br_multicast_fwd_src_add(struct net_bridge_group_src *src)
- {
- struct net_bridge_mdb_entry *star_mp;
- struct net_bridge_port_group *sg;
- struct br_ip sg_ip;
- if (src->flags & BR_SGRP_F_INSTALLED)
- return;
- memset(&sg_ip, 0, sizeof(sg_ip));
- sg_ip = src->pg->key.addr;
- sg_ip.src = src->addr.src;
- sg = __br_multicast_add_group(src->br, src->pg->key.port, &sg_ip,
- src->pg->eth_addr, MCAST_INCLUDE, false,
- !timer_pending(&src->timer));
- if (IS_ERR_OR_NULL(sg))
- return;
- src->flags |= BR_SGRP_F_INSTALLED;
- sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL;
- /* if it was added by user-space as perm we can skip next steps */
- if (sg->rt_protocol != RTPROT_KERNEL &&
- (sg->flags & MDB_PG_FLAGS_PERMANENT))
- return;
- /* the kernel is now responsible for removing this S,G */
- del_timer(&sg->timer);
- star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr);
- if (!star_mp)
- return;
- br_multicast_sg_add_exclude_ports(star_mp, sg);
- }
- static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src)
- {
- struct net_bridge_port_group *p, *pg = src->pg;
- struct net_bridge_port_group __rcu **pp;
- struct net_bridge_mdb_entry *mp;
- struct br_ip sg_ip;
- memset(&sg_ip, 0, sizeof(sg_ip));
- sg_ip = pg->key.addr;
- sg_ip.src = src->addr.src;
- mp = br_mdb_ip_get(src->br, &sg_ip);
- if (!mp)
- return;
- for (pp = &mp->ports;
- (p = mlock_dereference(*pp, src->br)) != NULL;
- pp = &p->next) {
- if (!br_port_group_equal(p, pg->key.port, pg->eth_addr))
- continue;
- if (p->rt_protocol != RTPROT_KERNEL &&
- (p->flags & MDB_PG_FLAGS_PERMANENT))
- break;
- br_multicast_del_pg(mp, p, pp);
- break;
- }
- src->flags &= ~BR_SGRP_F_INSTALLED;
- }
- /* install S,G and based on src's timer enable or disable forwarding */
- static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src)
- {
- struct net_bridge_port_group_sg_key sg_key;
- struct net_bridge_port_group *sg;
- u8 old_flags;
- br_multicast_fwd_src_add(src);
- memset(&sg_key, 0, sizeof(sg_key));
- sg_key.addr = src->pg->key.addr;
- sg_key.addr.src = src->addr.src;
- sg_key.port = src->pg->key.port;
- sg = br_sg_port_find(src->br, &sg_key);
- if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT))
- return;
- old_flags = sg->flags;
- if (timer_pending(&src->timer))
- sg->flags &= ~MDB_PG_FLAGS_BLOCKED;
- else
- sg->flags |= MDB_PG_FLAGS_BLOCKED;
- if (old_flags != sg->flags) {
- struct net_bridge_mdb_entry *sg_mp;
- sg_mp = br_mdb_ip_get(src->br, &sg_key.addr);
- if (!sg_mp)
- return;
- br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB);
- }
- }
- static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc)
- {
- struct net_bridge_mdb_entry *mp;
- mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc);
- WARN_ON(!hlist_unhashed(&mp->mdb_node));
- WARN_ON(mp->ports);
- del_timer_sync(&mp->timer);
- kfree_rcu(mp, rcu);
- }
- static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp)
- {
- struct net_bridge *br = mp->br;
- rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
- br_mdb_rht_params);
- hlist_del_init_rcu(&mp->mdb_node);
- hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list);
- queue_work(system_long_wq, &br->mcast_gc_work);
- }
- static void br_multicast_group_expired(struct timer_list *t)
- {
- struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
- struct net_bridge *br = mp->br;
- spin_lock(&br->multicast_lock);
- if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) ||
- timer_pending(&mp->timer))
- goto out;
- br_multicast_host_leave(mp, true);
- if (mp->ports)
- goto out;
- br_multicast_del_mdb_entry(mp);
- out:
- spin_unlock(&br->multicast_lock);
- }
- static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc)
- {
- struct net_bridge_group_src *src;
- src = container_of(gc, struct net_bridge_group_src, mcast_gc);
- WARN_ON(!hlist_unhashed(&src->node));
- del_timer_sync(&src->timer);
- kfree_rcu(src, rcu);
- }
- static void br_multicast_del_group_src(struct net_bridge_group_src *src)
- {
- struct net_bridge *br = src->pg->key.port->br;
- br_multicast_fwd_src_remove(src);
- hlist_del_init_rcu(&src->node);
- src->pg->src_ents--;
- hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list);
- queue_work(system_long_wq, &br->mcast_gc_work);
- }
- static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc)
- {
- struct net_bridge_port_group *pg;
- pg = container_of(gc, struct net_bridge_port_group, mcast_gc);
- WARN_ON(!hlist_unhashed(&pg->mglist));
- WARN_ON(!hlist_empty(&pg->src_list));
- del_timer_sync(&pg->rexmit_timer);
- del_timer_sync(&pg->timer);
- kfree_rcu(pg, rcu);
- }
- void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
- struct net_bridge_port_group *pg,
- struct net_bridge_port_group __rcu **pp)
- {
- struct net_bridge *br = pg->key.port->br;
- struct net_bridge_group_src *ent;
- struct hlist_node *tmp;
- rcu_assign_pointer(*pp, pg->next);
- hlist_del_init(&pg->mglist);
- hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
- br_multicast_del_group_src(ent);
- br_mdb_notify(br->dev, mp, pg, RTM_DELMDB);
- if (!br_multicast_is_star_g(&mp->addr)) {
- rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode,
- br_sg_port_rht_params);
- br_multicast_sg_del_exclude_ports(mp);
- } else {
- br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
- }
- hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list);
- queue_work(system_long_wq, &br->mcast_gc_work);
- if (!mp->ports && !mp->host_joined && netif_running(br->dev))
- mod_timer(&mp->timer, jiffies);
- }
- static void br_multicast_find_del_pg(struct net_bridge *br,
- struct net_bridge_port_group *pg)
- {
- struct net_bridge_port_group __rcu **pp;
- struct net_bridge_mdb_entry *mp;
- struct net_bridge_port_group *p;
- mp = br_mdb_ip_get(br, &pg->key.addr);
- if (WARN_ON(!mp))
- return;
- for (pp = &mp->ports;
- (p = mlock_dereference(*pp, br)) != NULL;
- pp = &p->next) {
- if (p != pg)
- continue;
- br_multicast_del_pg(mp, pg, pp);
- return;
- }
- WARN_ON(1);
- }
- static void br_multicast_port_group_expired(struct timer_list *t)
- {
- struct net_bridge_port_group *pg = from_timer(pg, t, timer);
- struct net_bridge_group_src *src_ent;
- struct net_bridge *br = pg->key.port->br;
- struct hlist_node *tmp;
- bool changed;
- spin_lock(&br->multicast_lock);
- if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
- hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
- goto out;
- changed = !!(pg->filter_mode == MCAST_EXCLUDE);
- pg->filter_mode = MCAST_INCLUDE;
- hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) {
- if (!timer_pending(&src_ent->timer)) {
- br_multicast_del_group_src(src_ent);
- changed = true;
- }
- }
- if (hlist_empty(&pg->src_list)) {
- br_multicast_find_del_pg(br, pg);
- } else if (changed) {
- struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr);
- if (changed && br_multicast_is_star_g(&pg->key.addr))
- br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
- if (WARN_ON(!mp))
- goto out;
- br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB);
- }
- out:
- spin_unlock(&br->multicast_lock);
- }
- static void br_multicast_gc(struct hlist_head *head)
- {
- struct net_bridge_mcast_gc *gcent;
- struct hlist_node *tmp;
- hlist_for_each_entry_safe(gcent, tmp, head, gc_node) {
- hlist_del_init(&gcent->gc_node);
- gcent->destroy(gcent);
- }
- }
- static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
- struct net_bridge_port_group *pg,
- __be32 ip_dst, __be32 group,
- bool with_srcs, bool over_lmqt,
- u8 sflag, u8 *igmp_type,
- bool *need_rexmit)
- {
- struct net_bridge_port *p = pg ? pg->key.port : NULL;
- struct net_bridge_group_src *ent;
- size_t pkt_size, igmp_hdr_size;
- unsigned long now = jiffies;
- struct igmpv3_query *ihv3;
- void *csum_start = NULL;
- __sum16 *csum = NULL;
- struct sk_buff *skb;
- struct igmphdr *ih;
- struct ethhdr *eth;
- unsigned long lmqt;
- struct iphdr *iph;
- u16 lmqt_srcs = 0;
- igmp_hdr_size = sizeof(*ih);
- if (br->multicast_igmp_version == 3) {
- igmp_hdr_size = sizeof(*ihv3);
- if (pg && with_srcs) {
- lmqt = now + (br->multicast_last_member_interval *
- br->multicast_last_member_count);
- hlist_for_each_entry(ent, &pg->src_list, node) {
- if (over_lmqt == time_after(ent->timer.expires,
- lmqt) &&
- ent->src_query_rexmit_cnt > 0)
- lmqt_srcs++;
- }
- if (!lmqt_srcs)
- return NULL;
- igmp_hdr_size += lmqt_srcs * sizeof(__be32);
- }
- }
- pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size;
- if ((p && pkt_size > p->dev->mtu) ||
- pkt_size > br->dev->mtu)
- return NULL;
- skb = netdev_alloc_skb_ip_align(br->dev, pkt_size);
- if (!skb)
- goto out;
- skb->protocol = htons(ETH_P_IP);
- skb_reset_mac_header(skb);
- eth = eth_hdr(skb);
- ether_addr_copy(eth->h_source, br->dev->dev_addr);
- ip_eth_mc_map(ip_dst, eth->h_dest);
- eth->h_proto = htons(ETH_P_IP);
- skb_put(skb, sizeof(*eth));
- skb_set_network_header(skb, skb->len);
- iph = ip_hdr(skb);
- iph->tot_len = htons(pkt_size - sizeof(*eth));
- iph->version = 4;
- iph->ihl = 6;
- iph->tos = 0xc0;
- iph->id = 0;
- iph->frag_off = htons(IP_DF);
- iph->ttl = 1;
- iph->protocol = IPPROTO_IGMP;
- iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
- inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
- iph->daddr = ip_dst;
- ((u8 *)&iph[1])[0] = IPOPT_RA;
- ((u8 *)&iph[1])[1] = 4;
- ((u8 *)&iph[1])[2] = 0;
- ((u8 *)&iph[1])[3] = 0;
- ip_send_check(iph);
- skb_put(skb, 24);
- skb_set_transport_header(skb, skb->len);
- *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
- switch (br->multicast_igmp_version) {
- case 2:
- ih = igmp_hdr(skb);
- ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
- ih->code = (group ? br->multicast_last_member_interval :
- br->multicast_query_response_interval) /
- (HZ / IGMP_TIMER_SCALE);
- ih->group = group;
- ih->csum = 0;
- csum = &ih->csum;
- csum_start = (void *)ih;
- break;
- case 3:
- ihv3 = igmpv3_query_hdr(skb);
- ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
- ihv3->code = (group ? br->multicast_last_member_interval :
- br->multicast_query_response_interval) /
- (HZ / IGMP_TIMER_SCALE);
- ihv3->group = group;
- ihv3->qqic = br->multicast_query_interval / HZ;
- ihv3->nsrcs = htons(lmqt_srcs);
- ihv3->resv = 0;
- ihv3->suppress = sflag;
- ihv3->qrv = 2;
- ihv3->csum = 0;
- csum = &ihv3->csum;
- csum_start = (void *)ihv3;
- if (!pg || !with_srcs)
- break;
- lmqt_srcs = 0;
- hlist_for_each_entry(ent, &pg->src_list, node) {
- if (over_lmqt == time_after(ent->timer.expires,
- lmqt) &&
- ent->src_query_rexmit_cnt > 0) {
- ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4;
- ent->src_query_rexmit_cnt--;
- if (need_rexmit && ent->src_query_rexmit_cnt)
- *need_rexmit = true;
- }
- }
- if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) {
- kfree_skb(skb);
- return NULL;
- }
- break;
- }
- if (WARN_ON(!csum || !csum_start)) {
- kfree_skb(skb);
- return NULL;
- }
- *csum = ip_compute_csum(csum_start, igmp_hdr_size);
- skb_put(skb, igmp_hdr_size);
- __skb_pull(skb, sizeof(*eth));
- out:
- return skb;
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
- struct net_bridge_port_group *pg,
- const struct in6_addr *ip6_dst,
- const struct in6_addr *group,
- bool with_srcs, bool over_llqt,
- u8 sflag, u8 *igmp_type,
- bool *need_rexmit)
- {
- struct net_bridge_port *p = pg ? pg->key.port : NULL;
- struct net_bridge_group_src *ent;
- size_t pkt_size, mld_hdr_size;
- unsigned long now = jiffies;
- struct mld2_query *mld2q;
- void *csum_start = NULL;
- unsigned long interval;
- __sum16 *csum = NULL;
- struct ipv6hdr *ip6h;
- struct mld_msg *mldq;
- struct sk_buff *skb;
- unsigned long llqt;
- struct ethhdr *eth;
- u16 llqt_srcs = 0;
- u8 *hopopt;
- mld_hdr_size = sizeof(*mldq);
- if (br->multicast_mld_version == 2) {
- mld_hdr_size = sizeof(*mld2q);
- if (pg && with_srcs) {
- llqt = now + (br->multicast_last_member_interval *
- br->multicast_last_member_count);
- hlist_for_each_entry(ent, &pg->src_list, node) {
- if (over_llqt == time_after(ent->timer.expires,
- llqt) &&
- ent->src_query_rexmit_cnt > 0)
- llqt_srcs++;
- }
- if (!llqt_srcs)
- return NULL;
- mld_hdr_size += llqt_srcs * sizeof(struct in6_addr);
- }
- }
- pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size;
- if ((p && pkt_size > p->dev->mtu) ||
- pkt_size > br->dev->mtu)
- return NULL;
- skb = netdev_alloc_skb_ip_align(br->dev, pkt_size);
- if (!skb)
- goto out;
- skb->protocol = htons(ETH_P_IPV6);
- /* Ethernet header */
- skb_reset_mac_header(skb);
- eth = eth_hdr(skb);
- ether_addr_copy(eth->h_source, br->dev->dev_addr);
- eth->h_proto = htons(ETH_P_IPV6);
- skb_put(skb, sizeof(*eth));
- /* IPv6 header + HbH option */
- skb_set_network_header(skb, skb->len);
- ip6h = ipv6_hdr(skb);
- *(__force __be32 *)ip6h = htonl(0x60000000);
- ip6h->payload_len = htons(8 + mld_hdr_size);
- ip6h->nexthdr = IPPROTO_HOPOPTS;
- ip6h->hop_limit = 1;
- ip6h->daddr = *ip6_dst;
- if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
- &ip6h->saddr)) {
- kfree_skb(skb);
- br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
- return NULL;
- }
- br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
- ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
- hopopt = (u8 *)(ip6h + 1);
- hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
- hopopt[1] = 0; /* length of HbH */
- hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
- hopopt[3] = 2; /* Length of RA Option */
- hopopt[4] = 0; /* Type = 0x0000 (MLD) */
- hopopt[5] = 0;
- hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
- hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
- skb_put(skb, sizeof(*ip6h) + 8);
- /* ICMPv6 */
- skb_set_transport_header(skb, skb->len);
- interval = ipv6_addr_any(group) ?
- br->multicast_query_response_interval :
- br->multicast_last_member_interval;
- *igmp_type = ICMPV6_MGM_QUERY;
- switch (br->multicast_mld_version) {
- case 1:
- mldq = (struct mld_msg *)icmp6_hdr(skb);
- mldq->mld_type = ICMPV6_MGM_QUERY;
- mldq->mld_code = 0;
- mldq->mld_cksum = 0;
- mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
- mldq->mld_reserved = 0;
- mldq->mld_mca = *group;
- csum = &mldq->mld_cksum;
- csum_start = (void *)mldq;
- break;
- case 2:
- mld2q = (struct mld2_query *)icmp6_hdr(skb);
- mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
- mld2q->mld2q_type = ICMPV6_MGM_QUERY;
- mld2q->mld2q_code = 0;
- mld2q->mld2q_cksum = 0;
- mld2q->mld2q_resv1 = 0;
- mld2q->mld2q_resv2 = 0;
- mld2q->mld2q_suppress = sflag;
- mld2q->mld2q_qrv = 2;
- mld2q->mld2q_nsrcs = htons(llqt_srcs);
- mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
- mld2q->mld2q_mca = *group;
- csum = &mld2q->mld2q_cksum;
- csum_start = (void *)mld2q;
- if (!pg || !with_srcs)
- break;
- llqt_srcs = 0;
- hlist_for_each_entry(ent, &pg->src_list, node) {
- if (over_llqt == time_after(ent->timer.expires,
- llqt) &&
- ent->src_query_rexmit_cnt > 0) {
- mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6;
- ent->src_query_rexmit_cnt--;
- if (need_rexmit && ent->src_query_rexmit_cnt)
- *need_rexmit = true;
- }
- }
- if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) {
- kfree_skb(skb);
- return NULL;
- }
- break;
- }
- if (WARN_ON(!csum || !csum_start)) {
- kfree_skb(skb);
- return NULL;
- }
- *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size,
- IPPROTO_ICMPV6,
- csum_partial(csum_start, mld_hdr_size, 0));
- skb_put(skb, mld_hdr_size);
- __skb_pull(skb, sizeof(*eth));
- out:
- return skb;
- }
- #endif
- static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
- struct net_bridge_port_group *pg,
- struct br_ip *ip_dst,
- struct br_ip *group,
- bool with_srcs, bool over_lmqt,
- u8 sflag, u8 *igmp_type,
- bool *need_rexmit)
- {
- __be32 ip4_dst;
- switch (group->proto) {
- case htons(ETH_P_IP):
- ip4_dst = ip_dst ? ip_dst->dst.ip4 : htonl(INADDR_ALLHOSTS_GROUP);
- return br_ip4_multicast_alloc_query(br, pg,
- ip4_dst, group->dst.ip4,
- with_srcs, over_lmqt,
- sflag, igmp_type,
- need_rexmit);
- #if IS_ENABLED(CONFIG_IPV6)
- case htons(ETH_P_IPV6): {
- struct in6_addr ip6_dst;
- if (ip_dst)
- ip6_dst = ip_dst->dst.ip6;
- else
- ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0,
- htonl(1));
- return br_ip6_multicast_alloc_query(br, pg,
- &ip6_dst, &group->dst.ip6,
- with_srcs, over_lmqt,
- sflag, igmp_type,
- need_rexmit);
- }
- #endif
- }
- return NULL;
- }
- struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
- struct br_ip *group)
- {
- struct net_bridge_mdb_entry *mp;
- int err;
- mp = br_mdb_ip_get(br, group);
- if (mp)
- return mp;
- if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
- br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
- return ERR_PTR(-E2BIG);
- }
- mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
- if (unlikely(!mp))
- return ERR_PTR(-ENOMEM);
- mp->br = br;
- mp->addr = *group;
- mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry;
- timer_setup(&mp->timer, br_multicast_group_expired, 0);
- err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
- br_mdb_rht_params);
- if (err) {
- kfree(mp);
- mp = ERR_PTR(err);
- } else {
- hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
- }
- return mp;
- }
- static void br_multicast_group_src_expired(struct timer_list *t)
- {
- struct net_bridge_group_src *src = from_timer(src, t, timer);
- struct net_bridge_port_group *pg;
- struct net_bridge *br = src->br;
- spin_lock(&br->multicast_lock);
- if (hlist_unhashed(&src->node) || !netif_running(br->dev) ||
- timer_pending(&src->timer))
- goto out;
- pg = src->pg;
- if (pg->filter_mode == MCAST_INCLUDE) {
- br_multicast_del_group_src(src);
- if (!hlist_empty(&pg->src_list))
- goto out;
- br_multicast_find_del_pg(br, pg);
- } else {
- br_multicast_fwd_src_handle(src);
- }
- out:
- spin_unlock(&br->multicast_lock);
- }
- static struct net_bridge_group_src *
- br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip)
- {
- struct net_bridge_group_src *ent;
- switch (ip->proto) {
- case htons(ETH_P_IP):
- hlist_for_each_entry(ent, &pg->src_list, node)
- if (ip->src.ip4 == ent->addr.src.ip4)
- return ent;
- break;
- #if IS_ENABLED(CONFIG_IPV6)
- case htons(ETH_P_IPV6):
- hlist_for_each_entry(ent, &pg->src_list, node)
- if (!ipv6_addr_cmp(&ent->addr.src.ip6, &ip->src.ip6))
- return ent;
- break;
- #endif
- }
- return NULL;
- }
- static struct net_bridge_group_src *
- br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip)
- {
- struct net_bridge_group_src *grp_src;
- if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT))
- return NULL;
- switch (src_ip->proto) {
- case htons(ETH_P_IP):
- if (ipv4_is_zeronet(src_ip->src.ip4) ||
- ipv4_is_multicast(src_ip->src.ip4))
- return NULL;
- break;
- #if IS_ENABLED(CONFIG_IPV6)
- case htons(ETH_P_IPV6):
- if (ipv6_addr_any(&src_ip->src.ip6) ||
- ipv6_addr_is_multicast(&src_ip->src.ip6))
- return NULL;
- break;
- #endif
- }
- grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC);
- if (unlikely(!grp_src))
- return NULL;
- grp_src->pg = pg;
- grp_src->br = pg->key.port->br;
- grp_src->addr = *src_ip;
- grp_src->mcast_gc.destroy = br_multicast_destroy_group_src;
- timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0);
- hlist_add_head_rcu(&grp_src->node, &pg->src_list);
- pg->src_ents++;
- return grp_src;
- }
- struct net_bridge_port_group *br_multicast_new_port_group(
- struct net_bridge_port *port,
- struct br_ip *group,
- struct net_bridge_port_group __rcu *next,
- unsigned char flags,
- const unsigned char *src,
- u8 filter_mode,
- u8 rt_protocol)
- {
- struct net_bridge_port_group *p;
- p = kzalloc(sizeof(*p), GFP_ATOMIC);
- if (unlikely(!p))
- return NULL;
- p->key.addr = *group;
- p->key.port = port;
- p->flags = flags;
- p->filter_mode = filter_mode;
- p->rt_protocol = rt_protocol;
- p->mcast_gc.destroy = br_multicast_destroy_port_group;
- INIT_HLIST_HEAD(&p->src_list);
- if (!br_multicast_is_star_g(group) &&
- rhashtable_lookup_insert_fast(&port->br->sg_port_tbl, &p->rhnode,
- br_sg_port_rht_params)) {
- kfree(p);
- return NULL;
- }
- rcu_assign_pointer(p->next, next);
- timer_setup(&p->timer, br_multicast_port_group_expired, 0);
- timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0);
- hlist_add_head(&p->mglist, &port->mglist);
- if (src)
- memcpy(p->eth_addr, src, ETH_ALEN);
- else
- eth_broadcast_addr(p->eth_addr);
- return p;
- }
- void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify)
- {
- if (!mp->host_joined) {
- mp->host_joined = true;
- if (br_multicast_is_star_g(&mp->addr))
- br_multicast_star_g_host_state(mp);
- if (notify)
- br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB);
- }
- mod_timer(&mp->timer, jiffies + mp->br->multicast_membership_interval);
- }
- void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify)
- {
- if (!mp->host_joined)
- return;
- mp->host_joined = false;
- if (br_multicast_is_star_g(&mp->addr))
- br_multicast_star_g_host_state(mp);
- if (notify)
- br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB);
- }
- static struct net_bridge_port_group *
- __br_multicast_add_group(struct net_bridge *br,
- struct net_bridge_port *port,
- struct br_ip *group,
- const unsigned char *src,
- u8 filter_mode,
- bool igmpv2_mldv1,
- bool blocked)
- {
- struct net_bridge_port_group __rcu **pp;
- struct net_bridge_port_group *p = NULL;
- struct net_bridge_mdb_entry *mp;
- unsigned long now = jiffies;
- if (!netif_running(br->dev) ||
- (port && port->state == BR_STATE_DISABLED))
- goto out;
- mp = br_multicast_new_group(br, group);
- if (IS_ERR(mp))
- return ERR_PTR(PTR_ERR(mp));
- if (!port) {
- br_multicast_host_join(mp, true);
- goto out;
- }
- for (pp = &mp->ports;
- (p = mlock_dereference(*pp, br)) != NULL;
- pp = &p->next) {
- if (br_port_group_equal(p, port, src))
- goto found;
- if ((unsigned long)p->key.port < (unsigned long)port)
- break;
- }
- p = br_multicast_new_port_group(port, group, *pp, 0, src, filter_mode,
- RTPROT_KERNEL);
- if (unlikely(!p)) {
- p = ERR_PTR(-ENOMEM);
- goto out;
- }
- rcu_assign_pointer(*pp, p);
- if (blocked)
- p->flags |= MDB_PG_FLAGS_BLOCKED;
- br_mdb_notify(br->dev, mp, p, RTM_NEWMDB);
- found:
- if (igmpv2_mldv1)
- mod_timer(&p->timer, now + br->multicast_membership_interval);
- out:
- return p;
- }
- static int br_multicast_add_group(struct net_bridge *br,
- struct net_bridge_port *port,
- struct br_ip *group,
- const unsigned char *src,
- u8 filter_mode,
- bool igmpv2_mldv1)
- {
- struct net_bridge_port_group *pg;
- int err;
- spin_lock(&br->multicast_lock);
- pg = __br_multicast_add_group(br, port, group, src, filter_mode,
- igmpv2_mldv1, false);
- /* NULL is considered valid for host joined groups */
- err = IS_ERR(pg) ? PTR_ERR(pg) : 0;
- spin_unlock(&br->multicast_lock);
- return err;
- }
- static int br_ip4_multicast_add_group(struct net_bridge *br,
- struct net_bridge_port *port,
- __be32 group,
- __u16 vid,
- const unsigned char *src,
- bool igmpv2)
- {
- struct br_ip br_group;
- u8 filter_mode;
- if (ipv4_is_local_multicast(group))
- return 0;
- memset(&br_group, 0, sizeof(br_group));
- br_group.dst.ip4 = group;
- br_group.proto = htons(ETH_P_IP);
- br_group.vid = vid;
- filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE;
- return br_multicast_add_group(br, port, &br_group, src, filter_mode,
- igmpv2);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static int br_ip6_multicast_add_group(struct net_bridge *br,
- struct net_bridge_port *port,
- const struct in6_addr *group,
- __u16 vid,
- const unsigned char *src,
- bool mldv1)
- {
- struct br_ip br_group;
- u8 filter_mode;
- if (ipv6_addr_is_ll_all_nodes(group))
- return 0;
- memset(&br_group, 0, sizeof(br_group));
- br_group.dst.ip6 = *group;
- br_group.proto = htons(ETH_P_IPV6);
- br_group.vid = vid;
- filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE;
- return br_multicast_add_group(br, port, &br_group, src, filter_mode,
- mldv1);
- }
- #endif
- static void br_multicast_router_expired(struct timer_list *t)
- {
- struct net_bridge_port *port =
- from_timer(port, t, multicast_router_timer);
- struct net_bridge *br = port->br;
- spin_lock(&br->multicast_lock);
- if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
- port->multicast_router == MDB_RTR_TYPE_PERM ||
- timer_pending(&port->multicast_router_timer))
- goto out;
- __del_port_router(port);
- out:
- spin_unlock(&br->multicast_lock);
- }
- static void br_mc_router_state_change(struct net_bridge *p,
- bool is_mc_router)
- {
- struct switchdev_attr attr = {
- .orig_dev = p->dev,
- .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
- .flags = SWITCHDEV_F_DEFER,
- .u.mrouter = is_mc_router,
- };
- switchdev_port_attr_set(p->dev, &attr);
- }
- static void br_multicast_local_router_expired(struct timer_list *t)
- {
- struct net_bridge *br = from_timer(br, t, multicast_router_timer);
- spin_lock(&br->multicast_lock);
- if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
- br->multicast_router == MDB_RTR_TYPE_PERM ||
- timer_pending(&br->multicast_router_timer))
- goto out;
- br_mc_router_state_change(br, false);
- out:
- spin_unlock(&br->multicast_lock);
- }
- static void br_multicast_querier_expired(struct net_bridge *br,
- struct bridge_mcast_own_query *query)
- {
- spin_lock(&br->multicast_lock);
- if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
- goto out;
- br_multicast_start_querier(br, query);
- out:
- spin_unlock(&br->multicast_lock);
- }
- static void br_ip4_multicast_querier_expired(struct timer_list *t)
- {
- struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
- br_multicast_querier_expired(br, &br->ip4_own_query);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static void br_ip6_multicast_querier_expired(struct timer_list *t)
- {
- struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
- br_multicast_querier_expired(br, &br->ip6_own_query);
- }
- #endif
- static void br_multicast_select_own_querier(struct net_bridge *br,
- struct br_ip *ip,
- struct sk_buff *skb)
- {
- if (ip->proto == htons(ETH_P_IP))
- br->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr;
- #if IS_ENABLED(CONFIG_IPV6)
- else
- br->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr;
- #endif
- }
- static void __br_multicast_send_query(struct net_bridge *br,
- struct net_bridge_port *port,
- struct net_bridge_port_group *pg,
- struct br_ip *ip_dst,
- struct br_ip *group,
- bool with_srcs,
- u8 sflag,
- bool *need_rexmit)
- {
- bool over_lmqt = !!sflag;
- struct sk_buff *skb;
- u8 igmp_type;
- again_under_lmqt:
- skb = br_multicast_alloc_query(br, pg, ip_dst, group, with_srcs,
- over_lmqt, sflag, &igmp_type,
- need_rexmit);
- if (!skb)
- return;
- if (port) {
- skb->dev = port->dev;
- br_multicast_count(br, port, skb, igmp_type,
- BR_MCAST_DIR_TX);
- NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
- dev_net(port->dev), NULL, skb, NULL, skb->dev,
- br_dev_queue_push_xmit);
- if (over_lmqt && with_srcs && sflag) {
- over_lmqt = false;
- goto again_under_lmqt;
- }
- } else {
- br_multicast_select_own_querier(br, group, skb);
- br_multicast_count(br, port, skb, igmp_type,
- BR_MCAST_DIR_RX);
- netif_rx(skb);
- }
- }
- static void br_multicast_send_query(struct net_bridge *br,
- struct net_bridge_port *port,
- struct bridge_mcast_own_query *own_query)
- {
- struct bridge_mcast_other_query *other_query = NULL;
- struct br_ip br_group;
- unsigned long time;
- if (!netif_running(br->dev) ||
- !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
- !br_opt_get(br, BROPT_MULTICAST_QUERIER))
- return;
- memset(&br_group.dst, 0, sizeof(br_group.dst));
- if (port ? (own_query == &port->ip4_own_query) :
- (own_query == &br->ip4_own_query)) {
- other_query = &br->ip4_other_query;
- br_group.proto = htons(ETH_P_IP);
- #if IS_ENABLED(CONFIG_IPV6)
- } else {
- other_query = &br->ip6_other_query;
- br_group.proto = htons(ETH_P_IPV6);
- #endif
- }
- if (!other_query || timer_pending(&other_query->timer))
- return;
- __br_multicast_send_query(br, port, NULL, NULL, &br_group, false, 0,
- NULL);
- time = jiffies;
- time += own_query->startup_sent < br->multicast_startup_query_count ?
- br->multicast_startup_query_interval :
- br->multicast_query_interval;
- mod_timer(&own_query->timer, time);
- }
- static void
- br_multicast_port_query_expired(struct net_bridge_port *port,
- struct bridge_mcast_own_query *query)
- {
- struct net_bridge *br = port->br;
- spin_lock(&br->multicast_lock);
- if (port->state == BR_STATE_DISABLED ||
- port->state == BR_STATE_BLOCKING)
- goto out;
- if (query->startup_sent < br->multicast_startup_query_count)
- query->startup_sent++;
- br_multicast_send_query(port->br, port, query);
- out:
- spin_unlock(&br->multicast_lock);
- }
- static void br_ip4_multicast_port_query_expired(struct timer_list *t)
- {
- struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
- br_multicast_port_query_expired(port, &port->ip4_own_query);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static void br_ip6_multicast_port_query_expired(struct timer_list *t)
- {
- struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
- br_multicast_port_query_expired(port, &port->ip6_own_query);
- }
- #endif
- static void br_multicast_port_group_rexmit(struct timer_list *t)
- {
- struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer);
- struct bridge_mcast_other_query *other_query = NULL;
- struct net_bridge *br = pg->key.port->br;
- bool need_rexmit = false;
- spin_lock(&br->multicast_lock);
- if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
- !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
- !br_opt_get(br, BROPT_MULTICAST_QUERIER))
- goto out;
- if (pg->key.addr.proto == htons(ETH_P_IP))
- other_query = &br->ip4_other_query;
- #if IS_ENABLED(CONFIG_IPV6)
- else
- other_query = &br->ip6_other_query;
- #endif
- if (!other_query || timer_pending(&other_query->timer))
- goto out;
- if (pg->grp_query_rexmit_cnt) {
- pg->grp_query_rexmit_cnt--;
- __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
- &pg->key.addr, false, 1, NULL);
- }
- __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
- &pg->key.addr, true, 0, &need_rexmit);
- if (pg->grp_query_rexmit_cnt || need_rexmit)
- mod_timer(&pg->rexmit_timer, jiffies +
- br->multicast_last_member_interval);
- out:
- spin_unlock(&br->multicast_lock);
- }
- static void br_mc_disabled_update(struct net_device *dev, bool value)
- {
- struct switchdev_attr attr = {
- .orig_dev = dev,
- .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
- .flags = SWITCHDEV_F_DEFER,
- .u.mc_disabled = !value,
- };
- switchdev_port_attr_set(dev, &attr);
- }
- int br_multicast_add_port(struct net_bridge_port *port)
- {
- port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
- timer_setup(&port->multicast_router_timer,
- br_multicast_router_expired, 0);
- timer_setup(&port->ip4_own_query.timer,
- br_ip4_multicast_port_query_expired, 0);
- #if IS_ENABLED(CONFIG_IPV6)
- timer_setup(&port->ip6_own_query.timer,
- br_ip6_multicast_port_query_expired, 0);
- #endif
- br_mc_disabled_update(port->dev,
- br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
- port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
- if (!port->mcast_stats)
- return -ENOMEM;
- return 0;
- }
- void br_multicast_del_port(struct net_bridge_port *port)
- {
- struct net_bridge *br = port->br;
- struct net_bridge_port_group *pg;
- HLIST_HEAD(deleted_head);
- struct hlist_node *n;
- /* Take care of the remaining groups, only perm ones should be left */
- spin_lock_bh(&br->multicast_lock);
- hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
- br_multicast_find_del_pg(br, pg);
- hlist_move_list(&br->mcast_gc_list, &deleted_head);
- spin_unlock_bh(&br->multicast_lock);
- br_multicast_gc(&deleted_head);
- del_timer_sync(&port->multicast_router_timer);
- free_percpu(port->mcast_stats);
- }
- static void br_multicast_enable(struct bridge_mcast_own_query *query)
- {
- query->startup_sent = 0;
- if (try_to_del_timer_sync(&query->timer) >= 0 ||
- del_timer(&query->timer))
- mod_timer(&query->timer, jiffies);
- }
- static void __br_multicast_enable_port(struct net_bridge_port *port)
- {
- struct net_bridge *br = port->br;
- if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
- return;
- br_multicast_enable(&port->ip4_own_query);
- #if IS_ENABLED(CONFIG_IPV6)
- br_multicast_enable(&port->ip6_own_query);
- #endif
- if (port->multicast_router == MDB_RTR_TYPE_PERM &&
- hlist_unhashed(&port->rlist))
- br_multicast_add_router(br, port);
- }
- void br_multicast_enable_port(struct net_bridge_port *port)
- {
- struct net_bridge *br = port->br;
- spin_lock(&br->multicast_lock);
- __br_multicast_enable_port(port);
- spin_unlock(&br->multicast_lock);
- }
- void br_multicast_disable_port(struct net_bridge_port *port)
- {
- struct net_bridge *br = port->br;
- struct net_bridge_port_group *pg;
- struct hlist_node *n;
- spin_lock(&br->multicast_lock);
- hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
- if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
- br_multicast_find_del_pg(br, pg);
- __del_port_router(port);
- del_timer(&port->multicast_router_timer);
- del_timer(&port->ip4_own_query.timer);
- #if IS_ENABLED(CONFIG_IPV6)
- del_timer(&port->ip6_own_query.timer);
- #endif
- spin_unlock(&br->multicast_lock);
- }
- static int __grp_src_delete_marked(struct net_bridge_port_group *pg)
- {
- struct net_bridge_group_src *ent;
- struct hlist_node *tmp;
- int deleted = 0;
- hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
- if (ent->flags & BR_SGRP_F_DELETE) {
- br_multicast_del_group_src(ent);
- deleted++;
- }
- return deleted;
- }
- static void __grp_src_mod_timer(struct net_bridge_group_src *src,
- unsigned long expires)
- {
- mod_timer(&src->timer, expires);
- br_multicast_fwd_src_handle(src);
- }
- static void __grp_src_query_marked_and_rexmit(struct net_bridge_port_group *pg)
- {
- struct bridge_mcast_other_query *other_query = NULL;
- struct net_bridge *br = pg->key.port->br;
- u32 lmqc = br->multicast_last_member_count;
- unsigned long lmqt, lmi, now = jiffies;
- struct net_bridge_group_src *ent;
- if (!netif_running(br->dev) ||
- !br_opt_get(br, BROPT_MULTICAST_ENABLED))
- return;
- if (pg->key.addr.proto == htons(ETH_P_IP))
- other_query = &br->ip4_other_query;
- #if IS_ENABLED(CONFIG_IPV6)
- else
- other_query = &br->ip6_other_query;
- #endif
- lmqt = now + br_multicast_lmqt(br);
- hlist_for_each_entry(ent, &pg->src_list, node) {
- if (ent->flags & BR_SGRP_F_SEND) {
- ent->flags &= ~BR_SGRP_F_SEND;
- if (ent->timer.expires > lmqt) {
- if (br_opt_get(br, BROPT_MULTICAST_QUERIER) &&
- other_query &&
- !timer_pending(&other_query->timer))
- ent->src_query_rexmit_cnt = lmqc;
- __grp_src_mod_timer(ent, lmqt);
- }
- }
- }
- if (!br_opt_get(br, BROPT_MULTICAST_QUERIER) ||
- !other_query || timer_pending(&other_query->timer))
- return;
- __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
- &pg->key.addr, true, 1, NULL);
- lmi = now + br->multicast_last_member_interval;
- if (!timer_pending(&pg->rexmit_timer) ||
- time_after(pg->rexmit_timer.expires, lmi))
- mod_timer(&pg->rexmit_timer, lmi);
- }
- static void __grp_send_query_and_rexmit(struct net_bridge_port_group *pg)
- {
- struct bridge_mcast_other_query *other_query = NULL;
- struct net_bridge *br = pg->key.port->br;
- unsigned long now = jiffies, lmi;
- if (!netif_running(br->dev) ||
- !br_opt_get(br, BROPT_MULTICAST_ENABLED))
- return;
- if (pg->key.addr.proto == htons(ETH_P_IP))
- other_query = &br->ip4_other_query;
- #if IS_ENABLED(CONFIG_IPV6)
- else
- other_query = &br->ip6_other_query;
- #endif
- if (br_opt_get(br, BROPT_MULTICAST_QUERIER) &&
- other_query && !timer_pending(&other_query->timer)) {
- lmi = now + br->multicast_last_member_interval;
- pg->grp_query_rexmit_cnt = br->multicast_last_member_count - 1;
- __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
- &pg->key.addr, false, 0, NULL);
- if (!timer_pending(&pg->rexmit_timer) ||
- time_after(pg->rexmit_timer.expires, lmi))
- mod_timer(&pg->rexmit_timer, lmi);
- }
- if (pg->filter_mode == MCAST_EXCLUDE &&
- (!timer_pending(&pg->timer) ||
- time_after(pg->timer.expires, now + br_multicast_lmqt(br))))
- mod_timer(&pg->timer, now + br_multicast_lmqt(br));
- }
- /* State Msg type New state Actions
- * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI
- * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI
- * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI
- */
- static bool br_multicast_isinc_allow(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge *br = pg->key.port->br;
- struct net_bridge_group_src *ent;
- unsigned long now = jiffies;
- bool changed = false;
- struct br_ip src_ip;
- u32 src_idx;
- memset(&src_ip, 0, sizeof(src_ip));
- src_ip.proto = pg->key.addr.proto;
- for (src_idx = 0; src_idx < nsrcs; src_idx++) {
- memcpy(&src_ip.src, srcs, src_size);
- ent = br_multicast_find_group_src(pg, &src_ip);
- if (!ent) {
- ent = br_multicast_new_group_src(pg, &src_ip);
- if (ent)
- changed = true;
- }
- if (ent)
- __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
- srcs += src_size;
- }
- return changed;
- }
- /* State Msg type New state Actions
- * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
- * Delete (A-B)
- * Group Timer=GMI
- */
- static void __grp_src_isexc_incl(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge_group_src *ent;
- struct br_ip src_ip;
- u32 src_idx;
- hlist_for_each_entry(ent, &pg->src_list, node)
- ent->flags |= BR_SGRP_F_DELETE;
- memset(&src_ip, 0, sizeof(src_ip));
- src_ip.proto = pg->key.addr.proto;
- for (src_idx = 0; src_idx < nsrcs; src_idx++) {
- memcpy(&src_ip.src, srcs, src_size);
- ent = br_multicast_find_group_src(pg, &src_ip);
- if (ent)
- ent->flags &= ~BR_SGRP_F_DELETE;
- else
- ent = br_multicast_new_group_src(pg, &src_ip);
- if (ent)
- br_multicast_fwd_src_handle(ent);
- srcs += src_size;
- }
- __grp_src_delete_marked(pg);
- }
- /* State Msg type New state Actions
- * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI
- * Delete (X-A)
- * Delete (Y-A)
- * Group Timer=GMI
- */
- static bool __grp_src_isexc_excl(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge *br = pg->key.port->br;
- struct net_bridge_group_src *ent;
- unsigned long now = jiffies;
- bool changed = false;
- struct br_ip src_ip;
- u32 src_idx;
- hlist_for_each_entry(ent, &pg->src_list, node)
- ent->flags |= BR_SGRP_F_DELETE;
- memset(&src_ip, 0, sizeof(src_ip));
- src_ip.proto = pg->key.addr.proto;
- for (src_idx = 0; src_idx < nsrcs; src_idx++) {
- memcpy(&src_ip.src, srcs, src_size);
- ent = br_multicast_find_group_src(pg, &src_ip);
- if (ent) {
- ent->flags &= ~BR_SGRP_F_DELETE;
- } else {
- ent = br_multicast_new_group_src(pg, &src_ip);
- if (ent) {
- __grp_src_mod_timer(ent,
- now + br_multicast_gmi(br));
- changed = true;
- }
- }
- srcs += src_size;
- }
- if (__grp_src_delete_marked(pg))
- changed = true;
- return changed;
- }
- static bool br_multicast_isexc(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge *br = pg->key.port->br;
- bool changed = false;
- switch (pg->filter_mode) {
- case MCAST_INCLUDE:
- __grp_src_isexc_incl(pg, srcs, nsrcs, src_size);
- br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
- changed = true;
- break;
- case MCAST_EXCLUDE:
- changed = __grp_src_isexc_excl(pg, srcs, nsrcs, src_size);
- break;
- }
- pg->filter_mode = MCAST_EXCLUDE;
- mod_timer(&pg->timer, jiffies + br_multicast_gmi(br));
- return changed;
- }
- /* State Msg type New state Actions
- * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI
- * Send Q(G,A-B)
- */
- static bool __grp_src_toin_incl(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge *br = pg->key.port->br;
- u32 src_idx, to_send = pg->src_ents;
- struct net_bridge_group_src *ent;
- unsigned long now = jiffies;
- bool changed = false;
- struct br_ip src_ip;
- hlist_for_each_entry(ent, &pg->src_list, node)
- ent->flags |= BR_SGRP_F_SEND;
- memset(&src_ip, 0, sizeof(src_ip));
- src_ip.proto = pg->key.addr.proto;
- for (src_idx = 0; src_idx < nsrcs; src_idx++) {
- memcpy(&src_ip.src, srcs, src_size);
- ent = br_multicast_find_group_src(pg, &src_ip);
- if (ent) {
- ent->flags &= ~BR_SGRP_F_SEND;
- to_send--;
- } else {
- ent = br_multicast_new_group_src(pg, &src_ip);
- if (ent)
- changed = true;
- }
- if (ent)
- __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
- srcs += src_size;
- }
- if (to_send)
- __grp_src_query_marked_and_rexmit(pg);
- return changed;
- }
- /* State Msg type New state Actions
- * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI
- * Send Q(G,X-A)
- * Send Q(G)
- */
- static bool __grp_src_toin_excl(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge *br = pg->key.port->br;
- u32 src_idx, to_send = pg->src_ents;
- struct net_bridge_group_src *ent;
- unsigned long now = jiffies;
- bool changed = false;
- struct br_ip src_ip;
- hlist_for_each_entry(ent, &pg->src_list, node)
- if (timer_pending(&ent->timer))
- ent->flags |= BR_SGRP_F_SEND;
- memset(&src_ip, 0, sizeof(src_ip));
- src_ip.proto = pg->key.addr.proto;
- for (src_idx = 0; src_idx < nsrcs; src_idx++) {
- memcpy(&src_ip.src, srcs, src_size);
- ent = br_multicast_find_group_src(pg, &src_ip);
- if (ent) {
- if (timer_pending(&ent->timer)) {
- ent->flags &= ~BR_SGRP_F_SEND;
- to_send--;
- }
- } else {
- ent = br_multicast_new_group_src(pg, &src_ip);
- if (ent)
- changed = true;
- }
- if (ent)
- __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
- srcs += src_size;
- }
- if (to_send)
- __grp_src_query_marked_and_rexmit(pg);
- __grp_send_query_and_rexmit(pg);
- return changed;
- }
- static bool br_multicast_toin(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- bool changed = false;
- switch (pg->filter_mode) {
- case MCAST_INCLUDE:
- changed = __grp_src_toin_incl(pg, srcs, nsrcs, src_size);
- break;
- case MCAST_EXCLUDE:
- changed = __grp_src_toin_excl(pg, srcs, nsrcs, src_size);
- break;
- }
- return changed;
- }
- /* State Msg type New state Actions
- * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
- * Delete (A-B)
- * Send Q(G,A*B)
- * Group Timer=GMI
- */
- static void __grp_src_toex_incl(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge_group_src *ent;
- u32 src_idx, to_send = 0;
- struct br_ip src_ip;
- hlist_for_each_entry(ent, &pg->src_list, node)
- ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
- memset(&src_ip, 0, sizeof(src_ip));
- src_ip.proto = pg->key.addr.proto;
- for (src_idx = 0; src_idx < nsrcs; src_idx++) {
- memcpy(&src_ip.src, srcs, src_size);
- ent = br_multicast_find_group_src(pg, &src_ip);
- if (ent) {
- ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) |
- BR_SGRP_F_SEND;
- to_send++;
- } else {
- ent = br_multicast_new_group_src(pg, &src_ip);
- }
- if (ent)
- br_multicast_fwd_src_handle(ent);
- srcs += src_size;
- }
- __grp_src_delete_marked(pg);
- if (to_send)
- __grp_src_query_marked_and_rexmit(pg);
- }
- /* State Msg type New state Actions
- * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer
- * Delete (X-A)
- * Delete (Y-A)
- * Send Q(G,A-Y)
- * Group Timer=GMI
- */
- static bool __grp_src_toex_excl(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge_group_src *ent;
- u32 src_idx, to_send = 0;
- bool changed = false;
- struct br_ip src_ip;
- hlist_for_each_entry(ent, &pg->src_list, node)
- ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
- memset(&src_ip, 0, sizeof(src_ip));
- src_ip.proto = pg->key.addr.proto;
- for (src_idx = 0; src_idx < nsrcs; src_idx++) {
- memcpy(&src_ip.src, srcs, src_size);
- ent = br_multicast_find_group_src(pg, &src_ip);
- if (ent) {
- ent->flags &= ~BR_SGRP_F_DELETE;
- } else {
- ent = br_multicast_new_group_src(pg, &src_ip);
- if (ent) {
- __grp_src_mod_timer(ent, pg->timer.expires);
- changed = true;
- }
- }
- if (ent && timer_pending(&ent->timer)) {
- ent->flags |= BR_SGRP_F_SEND;
- to_send++;
- }
- srcs += src_size;
- }
- if (__grp_src_delete_marked(pg))
- changed = true;
- if (to_send)
- __grp_src_query_marked_and_rexmit(pg);
- return changed;
- }
- static bool br_multicast_toex(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge *br = pg->key.port->br;
- bool changed = false;
- switch (pg->filter_mode) {
- case MCAST_INCLUDE:
- __grp_src_toex_incl(pg, srcs, nsrcs, src_size);
- br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
- changed = true;
- break;
- case MCAST_EXCLUDE:
- changed = __grp_src_toex_excl(pg, srcs, nsrcs, src_size);
- break;
- }
- pg->filter_mode = MCAST_EXCLUDE;
- mod_timer(&pg->timer, jiffies + br_multicast_gmi(br));
- return changed;
- }
- /* State Msg type New state Actions
- * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B)
- */
- static void __grp_src_block_incl(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge_group_src *ent;
- u32 src_idx, to_send = 0;
- struct br_ip src_ip;
- hlist_for_each_entry(ent, &pg->src_list, node)
- ent->flags &= ~BR_SGRP_F_SEND;
- memset(&src_ip, 0, sizeof(src_ip));
- src_ip.proto = pg->key.addr.proto;
- for (src_idx = 0; src_idx < nsrcs; src_idx++) {
- memcpy(&src_ip.src, srcs, src_size);
- ent = br_multicast_find_group_src(pg, &src_ip);
- if (ent) {
- ent->flags |= BR_SGRP_F_SEND;
- to_send++;
- }
- srcs += src_size;
- }
- if (to_send)
- __grp_src_query_marked_and_rexmit(pg);
- if (pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list))
- br_multicast_find_del_pg(pg->key.port->br, pg);
- }
- /* State Msg type New state Actions
- * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer
- * Send Q(G,A-Y)
- */
- static bool __grp_src_block_excl(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- struct net_bridge_group_src *ent;
- u32 src_idx, to_send = 0;
- bool changed = false;
- struct br_ip src_ip;
- hlist_for_each_entry(ent, &pg->src_list, node)
- ent->flags &= ~BR_SGRP_F_SEND;
- memset(&src_ip, 0, sizeof(src_ip));
- src_ip.proto = pg->key.addr.proto;
- for (src_idx = 0; src_idx < nsrcs; src_idx++) {
- memcpy(&src_ip.src, srcs, src_size);
- ent = br_multicast_find_group_src(pg, &src_ip);
- if (!ent) {
- ent = br_multicast_new_group_src(pg, &src_ip);
- if (ent) {
- __grp_src_mod_timer(ent, pg->timer.expires);
- changed = true;
- }
- }
- if (ent && timer_pending(&ent->timer)) {
- ent->flags |= BR_SGRP_F_SEND;
- to_send++;
- }
- srcs += src_size;
- }
- if (to_send)
- __grp_src_query_marked_and_rexmit(pg);
- return changed;
- }
- static bool br_multicast_block(struct net_bridge_port_group *pg,
- void *srcs, u32 nsrcs, size_t src_size)
- {
- bool changed = false;
- switch (pg->filter_mode) {
- case MCAST_INCLUDE:
- __grp_src_block_incl(pg, srcs, nsrcs, src_size);
- break;
- case MCAST_EXCLUDE:
- changed = __grp_src_block_excl(pg, srcs, nsrcs, src_size);
- break;
- }
- return changed;
- }
- static struct net_bridge_port_group *
- br_multicast_find_port(struct net_bridge_mdb_entry *mp,
- struct net_bridge_port *p,
- const unsigned char *src)
- {
- struct net_bridge *br __maybe_unused = mp->br;
- struct net_bridge_port_group *pg;
- for (pg = mlock_dereference(mp->ports, br);
- pg;
- pg = mlock_dereference(pg->next, br))
- if (br_port_group_equal(pg, p, src))
- return pg;
- return NULL;
- }
- static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
- struct net_bridge_port *port,
- struct sk_buff *skb,
- u16 vid)
- {
- bool igmpv2 = br->multicast_igmp_version == 2;
- struct net_bridge_mdb_entry *mdst;
- struct net_bridge_port_group *pg;
- const unsigned char *src;
- struct igmpv3_report *ih;
- struct igmpv3_grec *grec;
- int i, len, num, type;
- bool changed = false;
- __be32 group;
- int err = 0;
- u16 nsrcs;
- ih = igmpv3_report_hdr(skb);
- num = ntohs(ih->ngrec);
- len = skb_transport_offset(skb) + sizeof(*ih);
- for (i = 0; i < num; i++) {
- len += sizeof(*grec);
- if (!ip_mc_may_pull(skb, len))
- return -EINVAL;
- grec = (void *)(skb->data + len - sizeof(*grec));
- group = grec->grec_mca;
- type = grec->grec_type;
- nsrcs = ntohs(grec->grec_nsrcs);
- len += nsrcs * 4;
- if (!ip_mc_may_pull(skb, len))
- return -EINVAL;
- switch (type) {
- case IGMPV3_MODE_IS_INCLUDE:
- case IGMPV3_MODE_IS_EXCLUDE:
- case IGMPV3_CHANGE_TO_INCLUDE:
- case IGMPV3_CHANGE_TO_EXCLUDE:
- case IGMPV3_ALLOW_NEW_SOURCES:
- case IGMPV3_BLOCK_OLD_SOURCES:
- break;
- default:
- continue;
- }
- src = eth_hdr(skb)->h_source;
- if (nsrcs == 0 &&
- (type == IGMPV3_CHANGE_TO_INCLUDE ||
- type == IGMPV3_MODE_IS_INCLUDE)) {
- if (!port || igmpv2) {
- br_ip4_multicast_leave_group(br, port, group, vid, src);
- continue;
- }
- } else {
- err = br_ip4_multicast_add_group(br, port, group, vid,
- src, igmpv2);
- if (err)
- break;
- }
- if (!port || igmpv2)
- continue;
- spin_lock_bh(&br->multicast_lock);
- mdst = br_mdb_ip4_get(br, group, vid);
- if (!mdst)
- goto unlock_continue;
- pg = br_multicast_find_port(mdst, port, src);
- if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
- goto unlock_continue;
- /* reload grec */
- grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4));
- switch (type) {
- case IGMPV3_ALLOW_NEW_SOURCES:
- changed = br_multicast_isinc_allow(pg, grec->grec_src,
- nsrcs, sizeof(__be32));
- break;
- case IGMPV3_MODE_IS_INCLUDE:
- changed = br_multicast_isinc_allow(pg, grec->grec_src, nsrcs,
- sizeof(__be32));
- break;
- case IGMPV3_MODE_IS_EXCLUDE:
- changed = br_multicast_isexc(pg, grec->grec_src, nsrcs,
- sizeof(__be32));
- break;
- case IGMPV3_CHANGE_TO_INCLUDE:
- changed = br_multicast_toin(pg, grec->grec_src, nsrcs,
- sizeof(__be32));
- break;
- case IGMPV3_CHANGE_TO_EXCLUDE:
- changed = br_multicast_toex(pg, grec->grec_src, nsrcs,
- sizeof(__be32));
- break;
- case IGMPV3_BLOCK_OLD_SOURCES:
- changed = br_multicast_block(pg, grec->grec_src, nsrcs,
- sizeof(__be32));
- break;
- }
- if (changed)
- br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB);
- unlock_continue:
- spin_unlock_bh(&br->multicast_lock);
- }
- return err;
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static int br_ip6_multicast_mld2_report(struct net_bridge *br,
- struct net_bridge_port *port,
- struct sk_buff *skb,
- u16 vid)
- {
- bool mldv1 = br->multicast_mld_version == 1;
- struct net_bridge_mdb_entry *mdst;
- struct net_bridge_port_group *pg;
- unsigned int nsrcs_offset;
- const unsigned char *src;
- struct icmp6hdr *icmp6h;
- struct mld2_grec *grec;
- unsigned int grec_len;
- bool changed = false;
- int i, len, num;
- int err = 0;
- if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
- return -EINVAL;
- icmp6h = icmp6_hdr(skb);
- num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
- len = skb_transport_offset(skb) + sizeof(*icmp6h);
- for (i = 0; i < num; i++) {
- __be16 *_nsrcs, __nsrcs;
- u16 nsrcs;
- nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
- if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
- nsrcs_offset + sizeof(__nsrcs))
- return -EINVAL;
- _nsrcs = skb_header_pointer(skb, nsrcs_offset,
- sizeof(__nsrcs), &__nsrcs);
- if (!_nsrcs)
- return -EINVAL;
- nsrcs = ntohs(*_nsrcs);
- grec_len = struct_size(grec, grec_src, nsrcs);
- if (!ipv6_mc_may_pull(skb, len + grec_len))
- return -EINVAL;
- grec = (struct mld2_grec *)(skb->data + len);
- len += grec_len;
- switch (grec->grec_type) {
- case MLD2_MODE_IS_INCLUDE:
- case MLD2_MODE_IS_EXCLUDE:
- case MLD2_CHANGE_TO_INCLUDE:
- case MLD2_CHANGE_TO_EXCLUDE:
- case MLD2_ALLOW_NEW_SOURCES:
- case MLD2_BLOCK_OLD_SOURCES:
- break;
- default:
- continue;
- }
- src = eth_hdr(skb)->h_source;
- if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
- grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
- nsrcs == 0) {
- if (!port || mldv1) {
- br_ip6_multicast_leave_group(br, port,
- &grec->grec_mca,
- vid, src);
- continue;
- }
- } else {
- err = br_ip6_multicast_add_group(br, port,
- &grec->grec_mca, vid,
- src, mldv1);
- if (err)
- break;
- }
- if (!port || mldv1)
- continue;
- spin_lock_bh(&br->multicast_lock);
- mdst = br_mdb_ip6_get(br, &grec->grec_mca, vid);
- if (!mdst)
- goto unlock_continue;
- pg = br_multicast_find_port(mdst, port, src);
- if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
- goto unlock_continue;
- switch (grec->grec_type) {
- case MLD2_ALLOW_NEW_SOURCES:
- changed = br_multicast_isinc_allow(pg, grec->grec_src,
- nsrcs,
- sizeof(struct in6_addr));
- break;
- case MLD2_MODE_IS_INCLUDE:
- changed = br_multicast_isinc_allow(pg, grec->grec_src, nsrcs,
- sizeof(struct in6_addr));
- break;
- case MLD2_MODE_IS_EXCLUDE:
- changed = br_multicast_isexc(pg, grec->grec_src, nsrcs,
- sizeof(struct in6_addr));
- break;
- case MLD2_CHANGE_TO_INCLUDE:
- changed = br_multicast_toin(pg, grec->grec_src, nsrcs,
- sizeof(struct in6_addr));
- break;
- case MLD2_CHANGE_TO_EXCLUDE:
- changed = br_multicast_toex(pg, grec->grec_src, nsrcs,
- sizeof(struct in6_addr));
- break;
- case MLD2_BLOCK_OLD_SOURCES:
- changed = br_multicast_block(pg, grec->grec_src, nsrcs,
- sizeof(struct in6_addr));
- break;
- }
- if (changed)
- br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB);
- unlock_continue:
- spin_unlock_bh(&br->multicast_lock);
- }
- return err;
- }
- #endif
- static bool br_ip4_multicast_select_querier(struct net_bridge *br,
- struct net_bridge_port *port,
- __be32 saddr)
- {
- if (!timer_pending(&br->ip4_own_query.timer) &&
- !timer_pending(&br->ip4_other_query.timer))
- goto update;
- if (!br->ip4_querier.addr.src.ip4)
- goto update;
- if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.src.ip4))
- goto update;
- return false;
- update:
- br->ip4_querier.addr.src.ip4 = saddr;
- /* update protected by general multicast_lock by caller */
- rcu_assign_pointer(br->ip4_querier.port, port);
- return true;
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static bool br_ip6_multicast_select_querier(struct net_bridge *br,
- struct net_bridge_port *port,
- struct in6_addr *saddr)
- {
- if (!timer_pending(&br->ip6_own_query.timer) &&
- !timer_pending(&br->ip6_other_query.timer))
- goto update;
- if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.src.ip6) <= 0)
- goto update;
- return false;
- update:
- br->ip6_querier.addr.src.ip6 = *saddr;
- /* update protected by general multicast_lock by caller */
- rcu_assign_pointer(br->ip6_querier.port, port);
- return true;
- }
- #endif
- static bool br_multicast_select_querier(struct net_bridge *br,
- struct net_bridge_port *port,
- struct br_ip *saddr)
- {
- switch (saddr->proto) {
- case htons(ETH_P_IP):
- return br_ip4_multicast_select_querier(br, port, saddr->src.ip4);
- #if IS_ENABLED(CONFIG_IPV6)
- case htons(ETH_P_IPV6):
- return br_ip6_multicast_select_querier(br, port, &saddr->src.ip6);
- #endif
- }
- return false;
- }
- static void
- br_multicast_update_query_timer(struct net_bridge *br,
- struct bridge_mcast_other_query *query,
- unsigned long max_delay)
- {
- if (!timer_pending(&query->timer))
- query->delay_time = jiffies + max_delay;
- mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
- }
- static void br_port_mc_router_state_change(struct net_bridge_port *p,
- bool is_mc_router)
- {
- struct switchdev_attr attr = {
- .orig_dev = p->dev,
- .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
- .flags = SWITCHDEV_F_DEFER,
- .u.mrouter = is_mc_router,
- };
- switchdev_port_attr_set(p->dev, &attr);
- }
- /*
- * Add port to router_list
- * list is maintained ordered by pointer value
- * and locked by br->multicast_lock and RCU
- */
- static void br_multicast_add_router(struct net_bridge *br,
- struct net_bridge_port *port)
- {
- struct net_bridge_port *p;
- struct hlist_node *slot = NULL;
- if (!hlist_unhashed(&port->rlist))
- return;
- hlist_for_each_entry(p, &br->router_list, rlist) {
- if ((unsigned long) port >= (unsigned long) p)
- break;
- slot = &p->rlist;
- }
- if (slot)
- hlist_add_behind_rcu(&port->rlist, slot);
- else
- hlist_add_head_rcu(&port->rlist, &br->router_list);
- br_rtr_notify(br->dev, port, RTM_NEWMDB);
- br_port_mc_router_state_change(port, true);
- }
- static void br_multicast_mark_router(struct net_bridge *br,
- struct net_bridge_port *port)
- {
- unsigned long now = jiffies;
- if (!port) {
- if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
- if (!timer_pending(&br->multicast_router_timer))
- br_mc_router_state_change(br, true);
- mod_timer(&br->multicast_router_timer,
- now + br->multicast_querier_interval);
- }
- return;
- }
- if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
- port->multicast_router == MDB_RTR_TYPE_PERM)
- return;
- br_multicast_add_router(br, port);
- mod_timer(&port->multicast_router_timer,
- now + br->multicast_querier_interval);
- }
- static void br_multicast_query_received(struct net_bridge *br,
- struct net_bridge_port *port,
- struct bridge_mcast_other_query *query,
- struct br_ip *saddr,
- unsigned long max_delay)
- {
- if (!br_multicast_select_querier(br, port, saddr))
- return;
- br_multicast_update_query_timer(br, query, max_delay);
- br_multicast_mark_router(br, port);
- }
- static void br_ip4_multicast_query(struct net_bridge *br,
- struct net_bridge_port *port,
- struct sk_buff *skb,
- u16 vid)
- {
- unsigned int transport_len = ip_transport_len(skb);
- const struct iphdr *iph = ip_hdr(skb);
- struct igmphdr *ih = igmp_hdr(skb);
- struct net_bridge_mdb_entry *mp;
- struct igmpv3_query *ih3;
- struct net_bridge_port_group *p;
- struct net_bridge_port_group __rcu **pp;
- struct br_ip saddr;
- unsigned long max_delay;
- unsigned long now = jiffies;
- __be32 group;
- spin_lock(&br->multicast_lock);
- if (!netif_running(br->dev) ||
- (port && port->state == BR_STATE_DISABLED))
- goto out;
- group = ih->group;
- if (transport_len == sizeof(*ih)) {
- max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
- if (!max_delay) {
- max_delay = 10 * HZ;
- group = 0;
- }
- } else if (transport_len >= sizeof(*ih3)) {
- ih3 = igmpv3_query_hdr(skb);
- if (ih3->nsrcs ||
- (br->multicast_igmp_version == 3 && group && ih3->suppress))
- goto out;
- max_delay = ih3->code ?
- IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
- } else {
- goto out;
- }
- if (!group) {
- saddr.proto = htons(ETH_P_IP);
- saddr.src.ip4 = iph->saddr;
- br_multicast_query_received(br, port, &br->ip4_other_query,
- &saddr, max_delay);
- goto out;
- }
- mp = br_mdb_ip4_get(br, group, vid);
- if (!mp)
- goto out;
- max_delay *= br->multicast_last_member_count;
- if (mp->host_joined &&
- (timer_pending(&mp->timer) ?
- time_after(mp->timer.expires, now + max_delay) :
- try_to_del_timer_sync(&mp->timer) >= 0))
- mod_timer(&mp->timer, now + max_delay);
- for (pp = &mp->ports;
- (p = mlock_dereference(*pp, br)) != NULL;
- pp = &p->next) {
- if (timer_pending(&p->timer) ?
- time_after(p->timer.expires, now + max_delay) :
- try_to_del_timer_sync(&p->timer) >= 0 &&
- (br->multicast_igmp_version == 2 ||
- p->filter_mode == MCAST_EXCLUDE))
- mod_timer(&p->timer, now + max_delay);
- }
- out:
- spin_unlock(&br->multicast_lock);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static int br_ip6_multicast_query(struct net_bridge *br,
- struct net_bridge_port *port,
- struct sk_buff *skb,
- u16 vid)
- {
- unsigned int transport_len = ipv6_transport_len(skb);
- struct mld_msg *mld;
- struct net_bridge_mdb_entry *mp;
- struct mld2_query *mld2q;
- struct net_bridge_port_group *p;
- struct net_bridge_port_group __rcu **pp;
- struct br_ip saddr;
- unsigned long max_delay;
- unsigned long now = jiffies;
- unsigned int offset = skb_transport_offset(skb);
- const struct in6_addr *group = NULL;
- bool is_general_query;
- int err = 0;
- spin_lock(&br->multicast_lock);
- if (!netif_running(br->dev) ||
- (port && port->state == BR_STATE_DISABLED))
- goto out;
- if (transport_len == sizeof(*mld)) {
- if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
- err = -EINVAL;
- goto out;
- }
- mld = (struct mld_msg *) icmp6_hdr(skb);
- max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
- if (max_delay)
- group = &mld->mld_mca;
- } else {
- if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
- err = -EINVAL;
- goto out;
- }
- mld2q = (struct mld2_query *)icmp6_hdr(skb);
- if (!mld2q->mld2q_nsrcs)
- group = &mld2q->mld2q_mca;
- if (br->multicast_mld_version == 2 &&
- !ipv6_addr_any(&mld2q->mld2q_mca) &&
- mld2q->mld2q_suppress)
- goto out;
- max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
- }
- is_general_query = group && ipv6_addr_any(group);
- if (is_general_query) {
- saddr.proto = htons(ETH_P_IPV6);
- saddr.src.ip6 = ipv6_hdr(skb)->saddr;
- br_multicast_query_received(br, port, &br->ip6_other_query,
- &saddr, max_delay);
- goto out;
- } else if (!group) {
- goto out;
- }
- mp = br_mdb_ip6_get(br, group, vid);
- if (!mp)
- goto out;
- max_delay *= br->multicast_last_member_count;
- if (mp->host_joined &&
- (timer_pending(&mp->timer) ?
- time_after(mp->timer.expires, now + max_delay) :
- try_to_del_timer_sync(&mp->timer) >= 0))
- mod_timer(&mp->timer, now + max_delay);
- for (pp = &mp->ports;
- (p = mlock_dereference(*pp, br)) != NULL;
- pp = &p->next) {
- if (timer_pending(&p->timer) ?
- time_after(p->timer.expires, now + max_delay) :
- try_to_del_timer_sync(&p->timer) >= 0 &&
- (br->multicast_mld_version == 1 ||
- p->filter_mode == MCAST_EXCLUDE))
- mod_timer(&p->timer, now + max_delay);
- }
- out:
- spin_unlock(&br->multicast_lock);
- return err;
- }
- #endif
- static void
- br_multicast_leave_group(struct net_bridge *br,
- struct net_bridge_port *port,
- struct br_ip *group,
- struct bridge_mcast_other_query *other_query,
- struct bridge_mcast_own_query *own_query,
- const unsigned char *src)
- {
- struct net_bridge_mdb_entry *mp;
- struct net_bridge_port_group *p;
- unsigned long now;
- unsigned long time;
- spin_lock(&br->multicast_lock);
- if (!netif_running(br->dev) ||
- (port && port->state == BR_STATE_DISABLED))
- goto out;
- mp = br_mdb_ip_get(br, group);
- if (!mp)
- goto out;
- if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
- struct net_bridge_port_group __rcu **pp;
- for (pp = &mp->ports;
- (p = mlock_dereference(*pp, br)) != NULL;
- pp = &p->next) {
- if (!br_port_group_equal(p, port, src))
- continue;
- if (p->flags & MDB_PG_FLAGS_PERMANENT)
- break;
- p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
- br_multicast_del_pg(mp, p, pp);
- }
- goto out;
- }
- if (timer_pending(&other_query->timer))
- goto out;
- if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
- __br_multicast_send_query(br, port, NULL, NULL, &mp->addr,
- false, 0, NULL);
- time = jiffies + br->multicast_last_member_count *
- br->multicast_last_member_interval;
- mod_timer(&own_query->timer, time);
- for (p = mlock_dereference(mp->ports, br);
- p != NULL;
- p = mlock_dereference(p->next, br)) {
- if (!br_port_group_equal(p, port, src))
- continue;
- if (!hlist_unhashed(&p->mglist) &&
- (timer_pending(&p->timer) ?
- time_after(p->timer.expires, time) :
- try_to_del_timer_sync(&p->timer) >= 0)) {
- mod_timer(&p->timer, time);
- }
- break;
- }
- }
- now = jiffies;
- time = now + br->multicast_last_member_count *
- br->multicast_last_member_interval;
- if (!port) {
- if (mp->host_joined &&
- (timer_pending(&mp->timer) ?
- time_after(mp->timer.expires, time) :
- try_to_del_timer_sync(&mp->timer) >= 0)) {
- mod_timer(&mp->timer, time);
- }
- goto out;
- }
- for (p = mlock_dereference(mp->ports, br);
- p != NULL;
- p = mlock_dereference(p->next, br)) {
- if (p->key.port != port)
- continue;
- if (!hlist_unhashed(&p->mglist) &&
- (timer_pending(&p->timer) ?
- time_after(p->timer.expires, time) :
- try_to_del_timer_sync(&p->timer) >= 0)) {
- mod_timer(&p->timer, time);
- }
- break;
- }
- out:
- spin_unlock(&br->multicast_lock);
- }
- static void br_ip4_multicast_leave_group(struct net_bridge *br,
- struct net_bridge_port *port,
- __be32 group,
- __u16 vid,
- const unsigned char *src)
- {
- struct br_ip br_group;
- struct bridge_mcast_own_query *own_query;
- if (ipv4_is_local_multicast(group))
- return;
- own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
- memset(&br_group, 0, sizeof(br_group));
- br_group.dst.ip4 = group;
- br_group.proto = htons(ETH_P_IP);
- br_group.vid = vid;
- br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
- own_query, src);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static void br_ip6_multicast_leave_group(struct net_bridge *br,
- struct net_bridge_port *port,
- const struct in6_addr *group,
- __u16 vid,
- const unsigned char *src)
- {
- struct br_ip br_group;
- struct bridge_mcast_own_query *own_query;
- if (ipv6_addr_is_ll_all_nodes(group))
- return;
- own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
- memset(&br_group, 0, sizeof(br_group));
- br_group.dst.ip6 = *group;
- br_group.proto = htons(ETH_P_IPV6);
- br_group.vid = vid;
- br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
- own_query, src);
- }
- #endif
- static void br_multicast_err_count(const struct net_bridge *br,
- const struct net_bridge_port *p,
- __be16 proto)
- {
- struct bridge_mcast_stats __percpu *stats;
- struct bridge_mcast_stats *pstats;
- if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
- return;
- if (p)
- stats = p->mcast_stats;
- else
- stats = br->mcast_stats;
- if (WARN_ON(!stats))
- return;
- pstats = this_cpu_ptr(stats);
- u64_stats_update_begin(&pstats->syncp);
- switch (proto) {
- case htons(ETH_P_IP):
- pstats->mstats.igmp_parse_errors++;
- break;
- #if IS_ENABLED(CONFIG_IPV6)
- case htons(ETH_P_IPV6):
- pstats->mstats.mld_parse_errors++;
- break;
- #endif
- }
- u64_stats_update_end(&pstats->syncp);
- }
- static void br_multicast_pim(struct net_bridge *br,
- struct net_bridge_port *port,
- const struct sk_buff *skb)
- {
- unsigned int offset = skb_transport_offset(skb);
- struct pimhdr *pimhdr, _pimhdr;
- pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
- if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
- pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
- return;
- spin_lock(&br->multicast_lock);
- br_multicast_mark_router(br, port);
- spin_unlock(&br->multicast_lock);
- }
- static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
- struct net_bridge_port *port,
- struct sk_buff *skb)
- {
- if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
- igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
- return -ENOMSG;
- spin_lock(&br->multicast_lock);
- br_multicast_mark_router(br, port);
- spin_unlock(&br->multicast_lock);
- return 0;
- }
- static int br_multicast_ipv4_rcv(struct net_bridge *br,
- struct net_bridge_port *port,
- struct sk_buff *skb,
- u16 vid)
- {
- const unsigned char *src;
- struct igmphdr *ih;
- int err;
- err = ip_mc_check_igmp(skb);
- if (err == -ENOMSG) {
- if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
- BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
- } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
- if (ip_hdr(skb)->protocol == IPPROTO_PIM)
- br_multicast_pim(br, port, skb);
- } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
- br_ip4_multicast_mrd_rcv(br, port, skb);
- }
- return 0;
- } else if (err < 0) {
- br_multicast_err_count(br, port, skb->protocol);
- return err;
- }
- ih = igmp_hdr(skb);
- src = eth_hdr(skb)->h_source;
- BR_INPUT_SKB_CB(skb)->igmp = ih->type;
- switch (ih->type) {
- case IGMP_HOST_MEMBERSHIP_REPORT:
- case IGMPV2_HOST_MEMBERSHIP_REPORT:
- BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
- err = br_ip4_multicast_add_group(br, port, ih->group, vid, src,
- true);
- break;
- case IGMPV3_HOST_MEMBERSHIP_REPORT:
- err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
- break;
- case IGMP_HOST_MEMBERSHIP_QUERY:
- br_ip4_multicast_query(br, port, skb, vid);
- break;
- case IGMP_HOST_LEAVE_MESSAGE:
- br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
- break;
- }
- br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
- BR_MCAST_DIR_RX);
- return err;
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static void br_ip6_multicast_mrd_rcv(struct net_bridge *br,
- struct net_bridge_port *port,
- struct sk_buff *skb)
- {
- if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
- return;
- spin_lock(&br->multicast_lock);
- br_multicast_mark_router(br, port);
- spin_unlock(&br->multicast_lock);
- }
- static int br_multicast_ipv6_rcv(struct net_bridge *br,
- struct net_bridge_port *port,
- struct sk_buff *skb,
- u16 vid)
- {
- const unsigned char *src;
- struct mld_msg *mld;
- int err;
- err = ipv6_mc_check_mld(skb);
- if (err == -ENOMSG || err == -ENODATA) {
- if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
- BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
- if (err == -ENODATA &&
- ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr))
- br_ip6_multicast_mrd_rcv(br, port, skb);
- return 0;
- } else if (err < 0) {
- br_multicast_err_count(br, port, skb->protocol);
- return err;
- }
- mld = (struct mld_msg *)skb_transport_header(skb);
- BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
- switch (mld->mld_type) {
- case ICMPV6_MGM_REPORT:
- src = eth_hdr(skb)->h_source;
- BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
- err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
- src, true);
- break;
- case ICMPV6_MLD2_REPORT:
- err = br_ip6_multicast_mld2_report(br, port, skb, vid);
- break;
- case ICMPV6_MGM_QUERY:
- err = br_ip6_multicast_query(br, port, skb, vid);
- break;
- case ICMPV6_MGM_REDUCTION:
- src = eth_hdr(skb)->h_source;
- br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
- break;
- }
- br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
- BR_MCAST_DIR_RX);
- return err;
- }
- #endif
- int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
- struct sk_buff *skb, u16 vid)
- {
- int ret = 0;
- BR_INPUT_SKB_CB(skb)->igmp = 0;
- BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
- if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
- return 0;
- switch (skb->protocol) {
- case htons(ETH_P_IP):
- ret = br_multicast_ipv4_rcv(br, port, skb, vid);
- break;
- #if IS_ENABLED(CONFIG_IPV6)
- case htons(ETH_P_IPV6):
- ret = br_multicast_ipv6_rcv(br, port, skb, vid);
- break;
- #endif
- }
- return ret;
- }
- static void br_multicast_query_expired(struct net_bridge *br,
- struct bridge_mcast_own_query *query,
- struct bridge_mcast_querier *querier)
- {
- spin_lock(&br->multicast_lock);
- if (query->startup_sent < br->multicast_startup_query_count)
- query->startup_sent++;
- RCU_INIT_POINTER(querier->port, NULL);
- br_multicast_send_query(br, NULL, query);
- spin_unlock(&br->multicast_lock);
- }
- static void br_ip4_multicast_query_expired(struct timer_list *t)
- {
- struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
- br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static void br_ip6_multicast_query_expired(struct timer_list *t)
- {
- struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
- br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
- }
- #endif
- static void br_multicast_gc_work(struct work_struct *work)
- {
- struct net_bridge *br = container_of(work, struct net_bridge,
- mcast_gc_work);
- HLIST_HEAD(deleted_head);
- spin_lock_bh(&br->multicast_lock);
- hlist_move_list(&br->mcast_gc_list, &deleted_head);
- spin_unlock_bh(&br->multicast_lock);
- br_multicast_gc(&deleted_head);
- }
- void br_multicast_init(struct net_bridge *br)
- {
- br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
- br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
- br->multicast_last_member_count = 2;
- br->multicast_startup_query_count = 2;
- br->multicast_last_member_interval = HZ;
- br->multicast_query_response_interval = 10 * HZ;
- br->multicast_startup_query_interval = 125 * HZ / 4;
- br->multicast_query_interval = 125 * HZ;
- br->multicast_querier_interval = 255 * HZ;
- br->multicast_membership_interval = 260 * HZ;
- br->ip4_other_query.delay_time = 0;
- br->ip4_querier.port = NULL;
- br->multicast_igmp_version = 2;
- #if IS_ENABLED(CONFIG_IPV6)
- br->multicast_mld_version = 1;
- br->ip6_other_query.delay_time = 0;
- br->ip6_querier.port = NULL;
- #endif
- br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
- br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
- spin_lock_init(&br->multicast_lock);
- timer_setup(&br->multicast_router_timer,
- br_multicast_local_router_expired, 0);
- timer_setup(&br->ip4_other_query.timer,
- br_ip4_multicast_querier_expired, 0);
- timer_setup(&br->ip4_own_query.timer,
- br_ip4_multicast_query_expired, 0);
- #if IS_ENABLED(CONFIG_IPV6)
- timer_setup(&br->ip6_other_query.timer,
- br_ip6_multicast_querier_expired, 0);
- timer_setup(&br->ip6_own_query.timer,
- br_ip6_multicast_query_expired, 0);
- #endif
- INIT_HLIST_HEAD(&br->mdb_list);
- INIT_HLIST_HEAD(&br->mcast_gc_list);
- INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work);
- }
- static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
- {
- struct in_device *in_dev = in_dev_get(br->dev);
- if (!in_dev)
- return;
- __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
- in_dev_put(in_dev);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
- {
- struct in6_addr addr;
- ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
- ipv6_dev_mc_inc(br->dev, &addr);
- }
- #else
- static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
- {
- }
- #endif
- void br_multicast_join_snoopers(struct net_bridge *br)
- {
- br_ip4_multicast_join_snoopers(br);
- br_ip6_multicast_join_snoopers(br);
- }
- static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
- {
- struct in_device *in_dev = in_dev_get(br->dev);
- if (WARN_ON(!in_dev))
- return;
- __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
- in_dev_put(in_dev);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
- {
- struct in6_addr addr;
- ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
- ipv6_dev_mc_dec(br->dev, &addr);
- }
- #else
- static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
- {
- }
- #endif
- void br_multicast_leave_snoopers(struct net_bridge *br)
- {
- br_ip4_multicast_leave_snoopers(br);
- br_ip6_multicast_leave_snoopers(br);
- }
- static void __br_multicast_open(struct net_bridge *br,
- struct bridge_mcast_own_query *query)
- {
- query->startup_sent = 0;
- if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
- return;
- mod_timer(&query->timer, jiffies);
- }
- void br_multicast_open(struct net_bridge *br)
- {
- __br_multicast_open(br, &br->ip4_own_query);
- #if IS_ENABLED(CONFIG_IPV6)
- __br_multicast_open(br, &br->ip6_own_query);
- #endif
- }
- void br_multicast_stop(struct net_bridge *br)
- {
- del_timer_sync(&br->multicast_router_timer);
- del_timer_sync(&br->ip4_other_query.timer);
- del_timer_sync(&br->ip4_own_query.timer);
- #if IS_ENABLED(CONFIG_IPV6)
- del_timer_sync(&br->ip6_other_query.timer);
- del_timer_sync(&br->ip6_own_query.timer);
- #endif
- }
- void br_multicast_dev_del(struct net_bridge *br)
- {
- struct net_bridge_mdb_entry *mp;
- HLIST_HEAD(deleted_head);
- struct hlist_node *tmp;
- spin_lock_bh(&br->multicast_lock);
- hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node)
- br_multicast_del_mdb_entry(mp);
- hlist_move_list(&br->mcast_gc_list, &deleted_head);
- spin_unlock_bh(&br->multicast_lock);
- br_multicast_gc(&deleted_head);
- cancel_work_sync(&br->mcast_gc_work);
- rcu_barrier();
- }
- int br_multicast_set_router(struct net_bridge *br, unsigned long val)
- {
- int err = -EINVAL;
- spin_lock_bh(&br->multicast_lock);
- switch (val) {
- case MDB_RTR_TYPE_DISABLED:
- case MDB_RTR_TYPE_PERM:
- br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
- del_timer(&br->multicast_router_timer);
- br->multicast_router = val;
- err = 0;
- break;
- case MDB_RTR_TYPE_TEMP_QUERY:
- if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
- br_mc_router_state_change(br, false);
- br->multicast_router = val;
- err = 0;
- break;
- }
- spin_unlock_bh(&br->multicast_lock);
- return err;
- }
- static void __del_port_router(struct net_bridge_port *p)
- {
- if (hlist_unhashed(&p->rlist))
- return;
- hlist_del_init_rcu(&p->rlist);
- br_rtr_notify(p->br->dev, p, RTM_DELMDB);
- br_port_mc_router_state_change(p, false);
- /* don't allow timer refresh */
- if (p->multicast_router == MDB_RTR_TYPE_TEMP)
- p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
- }
- int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
- {
- struct net_bridge *br = p->br;
- unsigned long now = jiffies;
- int err = -EINVAL;
- spin_lock(&br->multicast_lock);
- if (p->multicast_router == val) {
- /* Refresh the temp router port timer */
- if (p->multicast_router == MDB_RTR_TYPE_TEMP)
- mod_timer(&p->multicast_router_timer,
- now + br->multicast_querier_interval);
- err = 0;
- goto unlock;
- }
- switch (val) {
- case MDB_RTR_TYPE_DISABLED:
- p->multicast_router = MDB_RTR_TYPE_DISABLED;
- __del_port_router(p);
- del_timer(&p->multicast_router_timer);
- break;
- case MDB_RTR_TYPE_TEMP_QUERY:
- p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
- __del_port_router(p);
- break;
- case MDB_RTR_TYPE_PERM:
- p->multicast_router = MDB_RTR_TYPE_PERM;
- del_timer(&p->multicast_router_timer);
- br_multicast_add_router(br, p);
- break;
- case MDB_RTR_TYPE_TEMP:
- p->multicast_router = MDB_RTR_TYPE_TEMP;
- br_multicast_mark_router(br, p);
- break;
- default:
- goto unlock;
- }
- err = 0;
- unlock:
- spin_unlock(&br->multicast_lock);
- return err;
- }
- static void br_multicast_start_querier(struct net_bridge *br,
- struct bridge_mcast_own_query *query)
- {
- struct net_bridge_port *port;
- __br_multicast_open(br, query);
- rcu_read_lock();
- list_for_each_entry_rcu(port, &br->port_list, list) {
- if (port->state == BR_STATE_DISABLED ||
- port->state == BR_STATE_BLOCKING)
- continue;
- if (query == &br->ip4_own_query)
- br_multicast_enable(&port->ip4_own_query);
- #if IS_ENABLED(CONFIG_IPV6)
- else
- br_multicast_enable(&port->ip6_own_query);
- #endif
- }
- rcu_read_unlock();
- }
- int br_multicast_toggle(struct net_bridge *br, unsigned long val)
- {
- struct net_bridge_port *port;
- bool change_snoopers = false;
- spin_lock_bh(&br->multicast_lock);
- if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
- goto unlock;
- br_mc_disabled_update(br->dev, val);
- br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
- if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
- change_snoopers = true;
- goto unlock;
- }
- if (!netif_running(br->dev))
- goto unlock;
- br_multicast_open(br);
- list_for_each_entry(port, &br->port_list, list)
- __br_multicast_enable_port(port);
- change_snoopers = true;
- unlock:
- spin_unlock_bh(&br->multicast_lock);
- /* br_multicast_join_snoopers has the potential to cause
- * an MLD Report/Leave to be delivered to br_multicast_rcv,
- * which would in turn call br_multicast_add_group, which would
- * attempt to acquire multicast_lock. This function should be
- * called after the lock has been released to avoid deadlocks on
- * multicast_lock.
- *
- * br_multicast_leave_snoopers does not have the problem since
- * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and
- * returns without calling br_multicast_ipv4/6_rcv if it's not
- * enabled. Moved both functions out just for symmetry.
- */
- if (change_snoopers) {
- if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
- br_multicast_join_snoopers(br);
- else
- br_multicast_leave_snoopers(br);
- }
- return 0;
- }
- bool br_multicast_enabled(const struct net_device *dev)
- {
- struct net_bridge *br = netdev_priv(dev);
- return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
- }
- EXPORT_SYMBOL_GPL(br_multicast_enabled);
- bool br_multicast_router(const struct net_device *dev)
- {
- struct net_bridge *br = netdev_priv(dev);
- bool is_router;
- spin_lock_bh(&br->multicast_lock);
- is_router = br_multicast_is_router(br);
- spin_unlock_bh(&br->multicast_lock);
- return is_router;
- }
- EXPORT_SYMBOL_GPL(br_multicast_router);
- int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
- {
- unsigned long max_delay;
- val = !!val;
- spin_lock_bh(&br->multicast_lock);
- if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
- goto unlock;
- br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
- if (!val)
- goto unlock;
- max_delay = br->multicast_query_response_interval;
- if (!timer_pending(&br->ip4_other_query.timer))
- br->ip4_other_query.delay_time = jiffies + max_delay;
- br_multicast_start_querier(br, &br->ip4_own_query);
- #if IS_ENABLED(CONFIG_IPV6)
- if (!timer_pending(&br->ip6_other_query.timer))
- br->ip6_other_query.delay_time = jiffies + max_delay;
- br_multicast_start_querier(br, &br->ip6_own_query);
- #endif
- unlock:
- spin_unlock_bh(&br->multicast_lock);
- return 0;
- }
- int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
- {
- /* Currently we support only version 2 and 3 */
- switch (val) {
- case 2:
- case 3:
- break;
- default:
- return -EINVAL;
- }
- spin_lock_bh(&br->multicast_lock);
- br->multicast_igmp_version = val;
- spin_unlock_bh(&br->multicast_lock);
- return 0;
- }
- #if IS_ENABLED(CONFIG_IPV6)
- int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
- {
- /* Currently we support version 1 and 2 */
- switch (val) {
- case 1:
- case 2:
- break;
- default:
- return -EINVAL;
- }
- spin_lock_bh(&br->multicast_lock);
- br->multicast_mld_version = val;
- spin_unlock_bh(&br->multicast_lock);
- return 0;
- }
- #endif
- /**
- * br_multicast_list_adjacent - Returns snooped multicast addresses
- * @dev: The bridge port adjacent to which to retrieve addresses
- * @br_ip_list: The list to store found, snooped multicast IP addresses in
- *
- * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
- * snooping feature on all bridge ports of dev's bridge device, excluding
- * the addresses from dev itself.
- *
- * Returns the number of items added to br_ip_list.
- *
- * Notes:
- * - br_ip_list needs to be initialized by caller
- * - br_ip_list might contain duplicates in the end
- * (needs to be taken care of by caller)
- * - br_ip_list needs to be freed by caller
- */
- int br_multicast_list_adjacent(struct net_device *dev,
- struct list_head *br_ip_list)
- {
- struct net_bridge *br;
- struct net_bridge_port *port;
- struct net_bridge_port_group *group;
- struct br_ip_list *entry;
- int count = 0;
- rcu_read_lock();
- if (!br_ip_list || !netif_is_bridge_port(dev))
- goto unlock;
- port = br_port_get_rcu(dev);
- if (!port || !port->br)
- goto unlock;
- br = port->br;
- list_for_each_entry_rcu(port, &br->port_list, list) {
- if (!port->dev || port->dev == dev)
- continue;
- hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
- entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
- if (!entry)
- goto unlock;
- entry->addr = group->key.addr;
- list_add(&entry->list, br_ip_list);
- count++;
- }
- }
- unlock:
- rcu_read_unlock();
- return count;
- }
- EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
- /**
- * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
- * @dev: The bridge port providing the bridge on which to check for a querier
- * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
- *
- * Checks whether the given interface has a bridge on top and if so returns
- * true if a valid querier exists anywhere on the bridged link layer.
- * Otherwise returns false.
- */
- bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
- {
- struct net_bridge *br;
- struct net_bridge_port *port;
- struct ethhdr eth;
- bool ret = false;
- rcu_read_lock();
- if (!netif_is_bridge_port(dev))
- goto unlock;
- port = br_port_get_rcu(dev);
- if (!port || !port->br)
- goto unlock;
- br = port->br;
- memset(ð, 0, sizeof(eth));
- eth.h_proto = htons(proto);
- ret = br_multicast_querier_exists(br, ð);
- unlock:
- rcu_read_unlock();
- return ret;
- }
- EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
- /**
- * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
- * @dev: The bridge port adjacent to which to check for a querier
- * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
- *
- * Checks whether the given interface has a bridge on top and if so returns
- * true if a selected querier is behind one of the other ports of this
- * bridge. Otherwise returns false.
- */
- bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
- {
- struct net_bridge *br;
- struct net_bridge_port *port;
- bool ret = false;
- rcu_read_lock();
- if (!netif_is_bridge_port(dev))
- goto unlock;
- port = br_port_get_rcu(dev);
- if (!port || !port->br)
- goto unlock;
- br = port->br;
- switch (proto) {
- case ETH_P_IP:
- if (!timer_pending(&br->ip4_other_query.timer) ||
- rcu_dereference(br->ip4_querier.port) == port)
- goto unlock;
- break;
- #if IS_ENABLED(CONFIG_IPV6)
- case ETH_P_IPV6:
- if (!timer_pending(&br->ip6_other_query.timer) ||
- rcu_dereference(br->ip6_querier.port) == port)
- goto unlock;
- break;
- #endif
- default:
- goto unlock;
- }
- ret = true;
- unlock:
- rcu_read_unlock();
- return ret;
- }
- EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
- static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
- const struct sk_buff *skb, u8 type, u8 dir)
- {
- struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
- __be16 proto = skb->protocol;
- unsigned int t_len;
- u64_stats_update_begin(&pstats->syncp);
- switch (proto) {
- case htons(ETH_P_IP):
- t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
- switch (type) {
- case IGMP_HOST_MEMBERSHIP_REPORT:
- pstats->mstats.igmp_v1reports[dir]++;
- break;
- case IGMPV2_HOST_MEMBERSHIP_REPORT:
- pstats->mstats.igmp_v2reports[dir]++;
- break;
- case IGMPV3_HOST_MEMBERSHIP_REPORT:
- pstats->mstats.igmp_v3reports[dir]++;
- break;
- case IGMP_HOST_MEMBERSHIP_QUERY:
- if (t_len != sizeof(struct igmphdr)) {
- pstats->mstats.igmp_v3queries[dir]++;
- } else {
- unsigned int offset = skb_transport_offset(skb);
- struct igmphdr *ih, _ihdr;
- ih = skb_header_pointer(skb, offset,
- sizeof(_ihdr), &_ihdr);
- if (!ih)
- break;
- if (!ih->code)
- pstats->mstats.igmp_v1queries[dir]++;
- else
- pstats->mstats.igmp_v2queries[dir]++;
- }
- break;
- case IGMP_HOST_LEAVE_MESSAGE:
- pstats->mstats.igmp_leaves[dir]++;
- break;
- }
- break;
- #if IS_ENABLED(CONFIG_IPV6)
- case htons(ETH_P_IPV6):
- t_len = ntohs(ipv6_hdr(skb)->payload_len) +
- sizeof(struct ipv6hdr);
- t_len -= skb_network_header_len(skb);
- switch (type) {
- case ICMPV6_MGM_REPORT:
- pstats->mstats.mld_v1reports[dir]++;
- break;
- case ICMPV6_MLD2_REPORT:
- pstats->mstats.mld_v2reports[dir]++;
- break;
- case ICMPV6_MGM_QUERY:
- if (t_len != sizeof(struct mld_msg))
- pstats->mstats.mld_v2queries[dir]++;
- else
- pstats->mstats.mld_v1queries[dir]++;
- break;
- case ICMPV6_MGM_REDUCTION:
- pstats->mstats.mld_leaves[dir]++;
- break;
- }
- break;
- #endif /* CONFIG_IPV6 */
- }
- u64_stats_update_end(&pstats->syncp);
- }
- void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
- const struct sk_buff *skb, u8 type, u8 dir)
- {
- struct bridge_mcast_stats __percpu *stats;
- /* if multicast_disabled is true then igmp type can't be set */
- if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
- return;
- if (p)
- stats = p->mcast_stats;
- else
- stats = br->mcast_stats;
- if (WARN_ON(!stats))
- return;
- br_mcast_stats_add(stats, skb, type, dir);
- }
- int br_multicast_init_stats(struct net_bridge *br)
- {
- br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
- if (!br->mcast_stats)
- return -ENOMEM;
- return 0;
- }
- void br_multicast_uninit_stats(struct net_bridge *br)
- {
- free_percpu(br->mcast_stats);
- }
- /* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */
- static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src)
- {
- dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
- dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
- }
- void br_multicast_get_stats(const struct net_bridge *br,
- const struct net_bridge_port *p,
- struct br_mcast_stats *dest)
- {
- struct bridge_mcast_stats __percpu *stats;
- struct br_mcast_stats tdst;
- int i;
- memset(dest, 0, sizeof(*dest));
- if (p)
- stats = p->mcast_stats;
- else
- stats = br->mcast_stats;
- if (WARN_ON(!stats))
- return;
- memset(&tdst, 0, sizeof(tdst));
- for_each_possible_cpu(i) {
- struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
- struct br_mcast_stats temp;
- unsigned int start;
- do {
- start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
- memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
- } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
- mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
- mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
- mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
- mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
- mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
- mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
- mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
- tdst.igmp_parse_errors += temp.igmp_parse_errors;
- mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
- mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
- mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
- mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
- mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
- tdst.mld_parse_errors += temp.mld_parse_errors;
- }
- memcpy(dest, &tdst, sizeof(*dest));
- }
- int br_mdb_hash_init(struct net_bridge *br)
- {
- int err;
- err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params);
- if (err)
- return err;
- err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
- if (err) {
- rhashtable_destroy(&br->sg_port_tbl);
- return err;
- }
- return 0;
- }
- void br_mdb_hash_fini(struct net_bridge *br)
- {
- rhashtable_destroy(&br->sg_port_tbl);
- rhashtable_destroy(&br->mdb_hash_tbl);
- }
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