| // 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" |
| #include "br_private_mcast_eht.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_mcast *brmctx, |
| struct bridge_mcast_own_query *query); |
| static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx); |
| static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| __be32 group, |
| __u16 vid, |
| const unsigned char *src); |
| static void br_multicast_port_group_rexmit(struct timer_list *t); |
| |
| static void |
| br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted); |
| static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx); |
| #if IS_ENABLED(CONFIG_IPV6) |
| static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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 void __br_multicast_stop(struct net_bridge_mcast *brmctx); |
| |
| static int br_mc_disabled_update(struct net_device *dev, bool value, |
| struct netlink_ext_ack *extack); |
| |
| 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_mcast *brmctx, |
| struct sk_buff *skb, u16 vid) |
| { |
| struct net_bridge *br = brmctx->br; |
| struct br_ip ip; |
| |
| if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || |
| br_multicast_ctx_vlan_global_disabled(brmctx)) |
| 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 (brmctx->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 (brmctx->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: |
| ip.proto = 0; |
| ether_addr_copy(ip.dst.mac_addr, eth_hdr(skb)->h_dest); |
| } |
| |
| return br_mdb_ip_get_rcu(br, &ip); |
| } |
| |
| /* IMPORTANT: this function must be used only when the contexts cannot be |
| * passed down (e.g. timer) and must be used for read-only purposes because |
| * the vlan snooping option can change, so it can return any context |
| * (non-vlan or vlan). Its initial intended purpose is to read timer values |
| * from the *current* context based on the option. At worst that could lead |
| * to inconsistent timers when the contexts are changed, i.e. src timer |
| * which needs to re-arm with a specific delay taken from the old context |
| */ |
| static struct net_bridge_mcast_port * |
| br_multicast_pg_to_port_ctx(const struct net_bridge_port_group *pg) |
| { |
| struct net_bridge_mcast_port *pmctx = &pg->key.port->multicast_ctx; |
| struct net_bridge_vlan *vlan; |
| |
| lockdep_assert_held_once(&pg->key.port->br->multicast_lock); |
| |
| /* if vlan snooping is disabled use the port's multicast context */ |
| if (!pg->key.addr.vid || |
| !br_opt_get(pg->key.port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) |
| goto out; |
| |
| /* locking is tricky here, due to different rules for multicast and |
| * vlans we need to take rcu to find the vlan and make sure it has |
| * the BR_VLFLAG_MCAST_ENABLED flag set, it can only change under |
| * multicast_lock which must be already held here, so the vlan's pmctx |
| * can safely be used on return |
| */ |
| rcu_read_lock(); |
| vlan = br_vlan_find(nbp_vlan_group_rcu(pg->key.port), pg->key.addr.vid); |
| if (vlan && !br_multicast_port_ctx_vlan_disabled(&vlan->port_mcast_ctx)) |
| pmctx = &vlan->port_mcast_ctx; |
| else |
| pmctx = NULL; |
| rcu_read_unlock(); |
| out: |
| return pmctx; |
| } |
| |
| /* when snooping we need to check if the contexts should be used |
| * in the following order: |
| * - if pmctx is non-NULL (port), check if it should be used |
| * - if pmctx is NULL (bridge), check if brmctx should be used |
| */ |
| static bool |
| br_multicast_ctx_should_use(const struct net_bridge_mcast *brmctx, |
| const struct net_bridge_mcast_port *pmctx) |
| { |
| if (!netif_running(brmctx->br->dev)) |
| return false; |
| |
| if (pmctx) |
| return !br_multicast_port_ctx_state_disabled(pmctx); |
| else |
| return !br_multicast_ctx_vlan_disabled(brmctx); |
| } |
| |
| 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_mcast_port *pmctx, |
| struct net_bridge_port_group *pg, |
| struct br_ip *sg_ip) |
| { |
| struct net_bridge_port_group_sg_key sg_key; |
| struct net_bridge_port_group *src_pg; |
| struct net_bridge_mcast *brmctx; |
| |
| memset(&sg_key, 0, sizeof(sg_key)); |
| brmctx = br_multicast_port_ctx_get_global(pmctx); |
| sg_key.port = pg->key.port; |
| sg_key.addr = *sg_ip; |
| if (br_sg_port_find(brmctx->br, &sg_key)) |
| return; |
| |
| src_pg = __br_multicast_add_group(brmctx, pmctx, |
| 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_mcast_port *pmctx; |
| 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; |
| pmctx = br_multicast_pg_to_port_ctx(pg); |
| if (!pmctx) |
| 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(pmctx, 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_mcast_port *pmctx; |
| struct net_bridge_port_group *pg; |
| struct net_bridge_mcast *brmctx; |
| |
| 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; |
| |
| pmctx = br_multicast_pg_to_port_ctx(pg); |
| if (!pmctx) |
| continue; |
| brmctx = br_multicast_port_ctx_get_global(pmctx); |
| |
| src_pg = __br_multicast_add_group(brmctx, pmctx, |
| &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_mcast_port *pmctx; |
| struct net_bridge_port_group *sg; |
| struct net_bridge_mcast *brmctx; |
| struct br_ip sg_ip; |
| |
| if (src->flags & BR_SGRP_F_INSTALLED) |
| return; |
| |
| memset(&sg_ip, 0, sizeof(sg_ip)); |
| pmctx = br_multicast_pg_to_port_ctx(src->pg); |
| if (!pmctx) |
| return; |
| brmctx = br_multicast_port_ctx_get_global(pmctx); |
| sg_ip = src->pg->key.addr; |
| sg_ip.src = src->addr.src; |
| |
| sg = __br_multicast_add_group(brmctx, pmctx, &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, |
| bool fastleave) |
| { |
| 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) && |
| !(src->flags & BR_SGRP_F_USER_ADDED)) |
| break; |
| |
| if (fastleave) |
| p->flags |= MDB_PG_FLAGS_FAST_LEAVE; |
| 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); |
| |
| timer_shutdown_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)); |
| |
| timer_shutdown_sync(&src->timer); |
| kfree_rcu(src, rcu); |
| } |
| |
| void __br_multicast_del_group_src(struct net_bridge_group_src *src) |
| { |
| struct net_bridge *br = src->pg->key.port->br; |
| |
| 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); |
| } |
| |
| void br_multicast_del_group_src(struct net_bridge_group_src *src, |
| bool fastleave) |
| { |
| br_multicast_fwd_src_remove(src, fastleave); |
| __br_multicast_del_group_src(src); |
| } |
| |
| 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)); |
| |
| timer_shutdown_sync(&pg->rexmit_timer); |
| timer_shutdown_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); |
| br_multicast_eht_clean_sets(pg); |
| hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) |
| br_multicast_del_group_src(ent, false); |
| 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, false); |
| 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 void __br_multicast_query_handle_vlan(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct sk_buff *skb) |
| { |
| struct net_bridge_vlan *vlan = NULL; |
| |
| if (pmctx && br_multicast_port_ctx_is_vlan(pmctx)) |
| vlan = pmctx->vlan; |
| else if (br_multicast_ctx_is_vlan(brmctx)) |
| vlan = brmctx->vlan; |
| |
| if (vlan && !(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED)) { |
| u16 vlan_proto; |
| |
| if (br_vlan_get_proto(brmctx->br->dev, &vlan_proto) != 0) |
| return; |
| __vlan_hwaccel_put_tag(skb, htons(vlan_proto), vlan->vid); |
| } |
| } |
| |
| static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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 (brmctx->multicast_igmp_version == 3) { |
| igmp_hdr_size = sizeof(*ihv3); |
| if (pg && with_srcs) { |
| lmqt = now + (brmctx->multicast_last_member_interval * |
| brmctx->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 > brmctx->br->dev->mtu) |
| return NULL; |
| |
| skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size); |
| if (!skb) |
| goto out; |
| |
| __br_multicast_query_handle_vlan(brmctx, pmctx, skb); |
| skb->protocol = htons(ETH_P_IP); |
| |
| skb_reset_mac_header(skb); |
| eth = eth_hdr(skb); |
| |
| ether_addr_copy(eth->h_source, brmctx->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(brmctx->br, BROPT_MULTICAST_QUERY_USE_IFADDR) ? |
| inet_select_addr(brmctx->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 (brmctx->multicast_igmp_version) { |
| case 2: |
| ih = igmp_hdr(skb); |
| ih->type = IGMP_HOST_MEMBERSHIP_QUERY; |
| ih->code = (group ? brmctx->multicast_last_member_interval : |
| brmctx->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 ? brmctx->multicast_last_member_interval : |
| brmctx->multicast_query_response_interval) / |
| (HZ / IGMP_TIMER_SCALE); |
| ihv3->group = group; |
| ihv3->qqic = brmctx->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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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 (brmctx->multicast_mld_version == 2) { |
| mld_hdr_size = sizeof(*mld2q); |
| if (pg && with_srcs) { |
| llqt = now + (brmctx->multicast_last_member_interval * |
| brmctx->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 > brmctx->br->dev->mtu) |
| return NULL; |
| |
| skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size); |
| if (!skb) |
| goto out; |
| |
| __br_multicast_query_handle_vlan(brmctx, pmctx, skb); |
| skb->protocol = htons(ETH_P_IPV6); |
| |
| /* Ethernet header */ |
| skb_reset_mac_header(skb); |
| eth = eth_hdr(skb); |
| |
| ether_addr_copy(eth->h_source, brmctx->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(brmctx->br->dev), brmctx->br->dev, |
| &ip6h->daddr, 0, &ip6h->saddr)) { |
| kfree_skb(skb); |
| br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, false); |
| return NULL; |
| } |
| |
| br_opt_toggle(brmctx->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) ? |
| brmctx->multicast_query_response_interval : |
| brmctx->multicast_last_member_interval; |
| *igmp_type = ICMPV6_MGM_QUERY; |
| switch (brmctx->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 = brmctx->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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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(brmctx, pmctx, 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(brmctx, pmctx, 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_mc_disabled_update(br->dev, false, NULL); |
| 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, false); |
| 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); |
| } |
| |
| 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; |
| } |
| |
| 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, |
| const 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->eht_host_tree = RB_ROOT; |
| p->eht_set_tree = RB_ROOT; |
| 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(const struct net_bridge_mcast *brmctx, |
| 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); |
| } |
| |
| if (br_group_is_l2(&mp->addr)) |
| return; |
| |
| mod_timer(&mp->timer, jiffies + brmctx->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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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 (!br_multicast_ctx_should_use(brmctx, pmctx)) |
| goto out; |
| |
| mp = br_multicast_new_group(brmctx->br, group); |
| if (IS_ERR(mp)) |
| return ERR_CAST(mp); |
| |
| if (!pmctx) { |
| br_multicast_host_join(brmctx, mp, true); |
| goto out; |
| } |
| |
| for (pp = &mp->ports; |
| (p = mlock_dereference(*pp, brmctx->br)) != NULL; |
| pp = &p->next) { |
| if (br_port_group_equal(p, pmctx->port, src)) |
| goto found; |
| if ((unsigned long)p->key.port < (unsigned long)pmctx->port) |
| break; |
| } |
| |
| p = br_multicast_new_port_group(pmctx->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(brmctx->br->dev, mp, p, RTM_NEWMDB); |
| |
| found: |
| if (igmpv2_mldv1) |
| mod_timer(&p->timer, |
| now + brmctx->multicast_membership_interval); |
| |
| out: |
| return p; |
| } |
| |
| static int br_multicast_add_group(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct br_ip *group, |
| const unsigned char *src, |
| u8 filter_mode, |
| bool igmpv2_mldv1) |
| { |
| struct net_bridge_port_group *pg; |
| int err; |
| |
| spin_lock(&brmctx->br->multicast_lock); |
| pg = __br_multicast_add_group(brmctx, pmctx, group, src, filter_mode, |
| igmpv2_mldv1, false); |
| /* NULL is considered valid for host joined groups */ |
| err = PTR_ERR_OR_ZERO(pg); |
| spin_unlock(&brmctx->br->multicast_lock); |
| |
| return err; |
| } |
| |
| static int br_ip4_multicast_add_group(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| __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(brmctx, pmctx, &br_group, src, |
| filter_mode, igmpv2); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static int br_ip6_multicast_add_group(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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(brmctx, pmctx, &br_group, src, |
| filter_mode, mldv1); |
| } |
| #endif |
| |
| static bool br_multicast_rport_del(struct hlist_node *rlist) |
| { |
| if (hlist_unhashed(rlist)) |
| return false; |
| |
| hlist_del_init_rcu(rlist); |
| return true; |
| } |
| |
| static bool br_ip4_multicast_rport_del(struct net_bridge_mcast_port *pmctx) |
| { |
| return br_multicast_rport_del(&pmctx->ip4_rlist); |
| } |
| |
| static bool br_ip6_multicast_rport_del(struct net_bridge_mcast_port *pmctx) |
| { |
| #if IS_ENABLED(CONFIG_IPV6) |
| return br_multicast_rport_del(&pmctx->ip6_rlist); |
| #else |
| return false; |
| #endif |
| } |
| |
| static void br_multicast_router_expired(struct net_bridge_mcast_port *pmctx, |
| struct timer_list *t, |
| struct hlist_node *rlist) |
| { |
| struct net_bridge *br = pmctx->port->br; |
| bool del; |
| |
| spin_lock(&br->multicast_lock); |
| if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED || |
| pmctx->multicast_router == MDB_RTR_TYPE_PERM || |
| timer_pending(t)) |
| goto out; |
| |
| del = br_multicast_rport_del(rlist); |
| br_multicast_rport_del_notify(pmctx, del); |
| out: |
| spin_unlock(&br->multicast_lock); |
| } |
| |
| static void br_ip4_multicast_router_expired(struct timer_list *t) |
| { |
| struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, |
| ip4_mc_router_timer); |
| |
| br_multicast_router_expired(pmctx, t, &pmctx->ip4_rlist); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static void br_ip6_multicast_router_expired(struct timer_list *t) |
| { |
| struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, |
| ip6_mc_router_timer); |
| |
| br_multicast_router_expired(pmctx, t, &pmctx->ip6_rlist); |
| } |
| #endif |
| |
| 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, NULL); |
| } |
| |
| static void br_multicast_local_router_expired(struct net_bridge_mcast *brmctx, |
| struct timer_list *timer) |
| { |
| spin_lock(&brmctx->br->multicast_lock); |
| if (brmctx->multicast_router == MDB_RTR_TYPE_DISABLED || |
| brmctx->multicast_router == MDB_RTR_TYPE_PERM || |
| br_ip4_multicast_is_router(brmctx) || |
| br_ip6_multicast_is_router(brmctx)) |
| goto out; |
| |
| br_mc_router_state_change(brmctx->br, false); |
| out: |
| spin_unlock(&brmctx->br->multicast_lock); |
| } |
| |
| static void br_ip4_multicast_local_router_expired(struct timer_list *t) |
| { |
| struct net_bridge_mcast *brmctx = from_timer(brmctx, t, |
| ip4_mc_router_timer); |
| |
| br_multicast_local_router_expired(brmctx, t); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static void br_ip6_multicast_local_router_expired(struct timer_list *t) |
| { |
| struct net_bridge_mcast *brmctx = from_timer(brmctx, t, |
| ip6_mc_router_timer); |
| |
| br_multicast_local_router_expired(brmctx, t); |
| } |
| #endif |
| |
| static void br_multicast_querier_expired(struct net_bridge_mcast *brmctx, |
| struct bridge_mcast_own_query *query) |
| { |
| spin_lock(&brmctx->br->multicast_lock); |
| if (!netif_running(brmctx->br->dev) || |
| br_multicast_ctx_vlan_global_disabled(brmctx) || |
| !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) |
| goto out; |
| |
| br_multicast_start_querier(brmctx, query); |
| |
| out: |
| spin_unlock(&brmctx->br->multicast_lock); |
| } |
| |
| static void br_ip4_multicast_querier_expired(struct timer_list *t) |
| { |
| struct net_bridge_mcast *brmctx = from_timer(brmctx, t, |
| ip4_other_query.timer); |
| |
| br_multicast_querier_expired(brmctx, &brmctx->ip4_own_query); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static void br_ip6_multicast_querier_expired(struct timer_list *t) |
| { |
| struct net_bridge_mcast *brmctx = from_timer(brmctx, t, |
| ip6_other_query.timer); |
| |
| br_multicast_querier_expired(brmctx, &brmctx->ip6_own_query); |
| } |
| #endif |
| |
| static void br_multicast_select_own_querier(struct net_bridge_mcast *brmctx, |
| struct br_ip *ip, |
| struct sk_buff *skb) |
| { |
| if (ip->proto == htons(ETH_P_IP)) |
| brmctx->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr; |
| #if IS_ENABLED(CONFIG_IPV6) |
| else |
| brmctx->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr; |
| #endif |
| } |
| |
| static void __br_multicast_send_query(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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; |
| |
| if (!br_multicast_ctx_should_use(brmctx, pmctx) || |
| !br_multicast_ctx_matches_vlan_snooping(brmctx)) |
| return; |
| |
| again_under_lmqt: |
| skb = br_multicast_alloc_query(brmctx, pmctx, pg, ip_dst, group, |
| with_srcs, over_lmqt, sflag, &igmp_type, |
| need_rexmit); |
| if (!skb) |
| return; |
| |
| if (pmctx) { |
| skb->dev = pmctx->port->dev; |
| br_multicast_count(brmctx->br, pmctx->port, skb, igmp_type, |
| BR_MCAST_DIR_TX); |
| NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, |
| dev_net(pmctx->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(brmctx, group, skb); |
| br_multicast_count(brmctx->br, NULL, skb, igmp_type, |
| BR_MCAST_DIR_RX); |
| netif_rx(skb); |
| } |
| } |
| |
| static void br_multicast_read_querier(const struct bridge_mcast_querier *querier, |
| struct bridge_mcast_querier *dest) |
| { |
| unsigned int seq; |
| |
| memset(dest, 0, sizeof(*dest)); |
| do { |
| seq = read_seqcount_begin(&querier->seq); |
| dest->port_ifidx = querier->port_ifidx; |
| memcpy(&dest->addr, &querier->addr, sizeof(struct br_ip)); |
| } while (read_seqcount_retry(&querier->seq, seq)); |
| } |
| |
| static void br_multicast_update_querier(struct net_bridge_mcast *brmctx, |
| struct bridge_mcast_querier *querier, |
| int ifindex, |
| struct br_ip *saddr) |
| { |
| write_seqcount_begin(&querier->seq); |
| querier->port_ifidx = ifindex; |
| memcpy(&querier->addr, saddr, sizeof(*saddr)); |
| write_seqcount_end(&querier->seq); |
| } |
| |
| static void br_multicast_send_query(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct bridge_mcast_own_query *own_query) |
| { |
| struct bridge_mcast_other_query *other_query = NULL; |
| struct bridge_mcast_querier *querier; |
| struct br_ip br_group; |
| unsigned long time; |
| |
| if (!br_multicast_ctx_should_use(brmctx, pmctx) || |
| !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) || |
| !brmctx->multicast_querier) |
| return; |
| |
| memset(&br_group.dst, 0, sizeof(br_group.dst)); |
| |
| if (pmctx ? (own_query == &pmctx->ip4_own_query) : |
| (own_query == &brmctx->ip4_own_query)) { |
| querier = &brmctx->ip4_querier; |
| other_query = &brmctx->ip4_other_query; |
| br_group.proto = htons(ETH_P_IP); |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| querier = &brmctx->ip6_querier; |
| other_query = &brmctx->ip6_other_query; |
| br_group.proto = htons(ETH_P_IPV6); |
| #endif |
| } |
| |
| if (!other_query || timer_pending(&other_query->timer)) |
| return; |
| |
| /* we're about to select ourselves as querier */ |
| if (!pmctx && querier->port_ifidx) { |
| struct br_ip zeroip = {}; |
| |
| br_multicast_update_querier(brmctx, querier, 0, &zeroip); |
| } |
| |
| __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &br_group, false, |
| 0, NULL); |
| |
| time = jiffies; |
| time += own_query->startup_sent < brmctx->multicast_startup_query_count ? |
| brmctx->multicast_startup_query_interval : |
| brmctx->multicast_query_interval; |
| mod_timer(&own_query->timer, time); |
| } |
| |
| static void |
| br_multicast_port_query_expired(struct net_bridge_mcast_port *pmctx, |
| struct bridge_mcast_own_query *query) |
| { |
| struct net_bridge *br = pmctx->port->br; |
| struct net_bridge_mcast *brmctx; |
| |
| spin_lock(&br->multicast_lock); |
| if (br_multicast_port_ctx_state_stopped(pmctx)) |
| goto out; |
| |
| brmctx = br_multicast_port_ctx_get_global(pmctx); |
| if (query->startup_sent < brmctx->multicast_startup_query_count) |
| query->startup_sent++; |
| |
| br_multicast_send_query(brmctx, pmctx, query); |
| |
| out: |
| spin_unlock(&br->multicast_lock); |
| } |
| |
| static void br_ip4_multicast_port_query_expired(struct timer_list *t) |
| { |
| struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, |
| ip4_own_query.timer); |
| |
| br_multicast_port_query_expired(pmctx, &pmctx->ip4_own_query); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static void br_ip6_multicast_port_query_expired(struct timer_list *t) |
| { |
| struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, |
| ip6_own_query.timer); |
| |
| br_multicast_port_query_expired(pmctx, &pmctx->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; |
| struct net_bridge_mcast_port *pmctx; |
| struct net_bridge_mcast *brmctx; |
| 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)) |
| goto out; |
| |
| pmctx = br_multicast_pg_to_port_ctx(pg); |
| if (!pmctx) |
| goto out; |
| brmctx = br_multicast_port_ctx_get_global(pmctx); |
| if (!brmctx->multicast_querier) |
| goto out; |
| |
| if (pg->key.addr.proto == htons(ETH_P_IP)) |
| other_query = &brmctx->ip4_other_query; |
| #if IS_ENABLED(CONFIG_IPV6) |
| else |
| other_query = &brmctx->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(brmctx, pmctx, pg, &pg->key.addr, |
| &pg->key.addr, false, 1, NULL); |
| } |
| __br_multicast_send_query(brmctx, pmctx, 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 + |
| brmctx->multicast_last_member_interval); |
| out: |
| spin_unlock(&br->multicast_lock); |
| } |
| |
| static int br_mc_disabled_update(struct net_device *dev, bool value, |
| struct netlink_ext_ack *extack) |
| { |
| struct switchdev_attr attr = { |
| .orig_dev = dev, |
| .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED, |
| .flags = SWITCHDEV_F_DEFER, |
| .u.mc_disabled = !value, |
| }; |
| |
| return switchdev_port_attr_set(dev, &attr, extack); |
| } |
| |
| void br_multicast_port_ctx_init(struct net_bridge_port *port, |
| struct net_bridge_vlan *vlan, |
| struct net_bridge_mcast_port *pmctx) |
| { |
| pmctx->port = port; |
| pmctx->vlan = vlan; |
| pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; |
| timer_setup(&pmctx->ip4_mc_router_timer, |
| br_ip4_multicast_router_expired, 0); |
| timer_setup(&pmctx->ip4_own_query.timer, |
| br_ip4_multicast_port_query_expired, 0); |
| #if IS_ENABLED(CONFIG_IPV6) |
| timer_setup(&pmctx->ip6_mc_router_timer, |
| br_ip6_multicast_router_expired, 0); |
| timer_setup(&pmctx->ip6_own_query.timer, |
| br_ip6_multicast_port_query_expired, 0); |
| #endif |
| } |
| |
| void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx) |
| { |
| #if IS_ENABLED(CONFIG_IPV6) |
| del_timer_sync(&pmctx->ip6_mc_router_timer); |
| #endif |
| del_timer_sync(&pmctx->ip4_mc_router_timer); |
| } |
| |
| int br_multicast_add_port(struct net_bridge_port *port) |
| { |
| int err; |
| |
| port->multicast_eht_hosts_limit = BR_MCAST_DEFAULT_EHT_HOSTS_LIMIT; |
| br_multicast_port_ctx_init(port, NULL, &port->multicast_ctx); |
| |
| err = br_mc_disabled_update(port->dev, |
| br_opt_get(port->br, |
| BROPT_MULTICAST_ENABLED), |
| NULL); |
| if (err && err != -EOPNOTSUPP) |
| return err; |
| |
| 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); |
| br_multicast_port_ctx_deinit(&port->multicast_ctx); |
| 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_ctx(struct net_bridge_mcast_port *pmctx) |
| { |
| struct net_bridge *br = pmctx->port->br; |
| struct net_bridge_mcast *brmctx; |
| |
| brmctx = br_multicast_port_ctx_get_global(pmctx); |
| if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || |
| !netif_running(br->dev)) |
| return; |
| |
| br_multicast_enable(&pmctx->ip4_own_query); |
| #if IS_ENABLED(CONFIG_IPV6) |
| br_multicast_enable(&pmctx->ip6_own_query); |
| #endif |
| if (pmctx->multicast_router == MDB_RTR_TYPE_PERM) { |
| br_ip4_multicast_add_router(brmctx, pmctx); |
| br_ip6_multicast_add_router(brmctx, pmctx); |
| } |
| } |
| |
| void br_multicast_enable_port(struct net_bridge_port *port) |
| { |
| struct net_bridge *br = port->br; |
| |
| spin_lock_bh(&br->multicast_lock); |
| __br_multicast_enable_port_ctx(&port->multicast_ctx); |
| spin_unlock_bh(&br->multicast_lock); |
| } |
| |
| static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx) |
| { |
| struct net_bridge_port_group *pg; |
| struct hlist_node *n; |
| bool del = false; |
| |
| hlist_for_each_entry_safe(pg, n, &pmctx->port->mglist, mglist) |
| if (!(pg->flags & MDB_PG_FLAGS_PERMANENT) && |
| (!br_multicast_port_ctx_is_vlan(pmctx) || |
| pg->key.addr.vid == pmctx->vlan->vid)) |
| br_multicast_find_del_pg(pmctx->port->br, pg); |
| |
| del |= br_ip4_multicast_rport_del(pmctx); |
| del_timer(&pmctx->ip4_mc_router_timer); |
| del_timer(&pmctx->ip4_own_query.timer); |
| del |= br_ip6_multicast_rport_del(pmctx); |
| #if IS_ENABLED(CONFIG_IPV6) |
| del_timer(&pmctx->ip6_mc_router_timer); |
| del_timer(&pmctx->ip6_own_query.timer); |
| #endif |
| br_multicast_rport_del_notify(pmctx, del); |
| } |
| |
| void br_multicast_disable_port(struct net_bridge_port *port) |
| { |
| spin_lock_bh(&port->br->multicast_lock); |
| __br_multicast_disable_port_ctx(&port->multicast_ctx); |
| spin_unlock_bh(&port->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, false); |
| 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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg) |
| { |
| struct bridge_mcast_other_query *other_query = NULL; |
| u32 lmqc = brmctx->multicast_last_member_count; |
| unsigned long lmqt, lmi, now = jiffies; |
| struct net_bridge_group_src *ent; |
| |
| if (!netif_running(brmctx->br->dev) || |
| !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) |
| return; |
| |
| if (pg->key.addr.proto == htons(ETH_P_IP)) |
| other_query = &brmctx->ip4_other_query; |
| #if IS_ENABLED(CONFIG_IPV6) |
| else |
| other_query = &brmctx->ip6_other_query; |
| #endif |
| |
| lmqt = now + br_multicast_lmqt(brmctx); |
| 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 (brmctx->multicast_querier && |
| other_query && |
| !timer_pending(&other_query->timer)) |
| ent->src_query_rexmit_cnt = lmqc; |
| __grp_src_mod_timer(ent, lmqt); |
| } |
| } |
| } |
| |
| if (!brmctx->multicast_querier || |
| !other_query || timer_pending(&other_query->timer)) |
| return; |
| |
| __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, |
| &pg->key.addr, true, 1, NULL); |
| |
| lmi = now + brmctx->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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg) |
| { |
| struct bridge_mcast_other_query *other_query = NULL; |
| unsigned long now = jiffies, lmi; |
| |
| if (!netif_running(brmctx->br->dev) || |
| !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) |
| return; |
| |
| if (pg->key.addr.proto == htons(ETH_P_IP)) |
| other_query = &brmctx->ip4_other_query; |
| #if IS_ENABLED(CONFIG_IPV6) |
| else |
| other_query = &brmctx->ip6_other_query; |
| #endif |
| |
| if (brmctx->multicast_querier && |
| other_query && !timer_pending(&other_query->timer)) { |
| lmi = now + brmctx->multicast_last_member_interval; |
| pg->grp_query_rexmit_cnt = brmctx->multicast_last_member_count - 1; |
| __br_multicast_send_query(brmctx, pmctx, 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(brmctx)))) |
| mod_timer(&pg->timer, now + br_multicast_lmqt(brmctx)); |
| } |
| |
| /* 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(const struct net_bridge_mcast *brmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, |
| int grec_type) |
| { |
| 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_idx * addr_size), addr_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(brmctx)); |
| } |
| |
| if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, |
| grec_type)) |
| changed = true; |
| |
| 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(const struct net_bridge_mcast *brmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, |
| int grec_type) |
| { |
| 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_idx * addr_size), addr_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); |
| } |
| |
| br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, |
| grec_type); |
| |
| __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(const struct net_bridge_mcast *brmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, |
| int grec_type) |
| { |
| 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_idx * addr_size), addr_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(brmctx)); |
| changed = true; |
| } |
| } |
| } |
| |
| if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, |
| grec_type)) |
| changed = true; |
| |
| if (__grp_src_delete_marked(pg)) |
| changed = true; |
| |
| return changed; |
| } |
| |
| static bool br_multicast_isexc(const struct net_bridge_mcast *brmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, |
| int grec_type) |
| { |
| bool changed = false; |
| |
| switch (pg->filter_mode) { |
| case MCAST_INCLUDE: |
| __grp_src_isexc_incl(brmctx, pg, h_addr, srcs, nsrcs, addr_size, |
| grec_type); |
| br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE); |
| changed = true; |
| break; |
| case MCAST_EXCLUDE: |
| changed = __grp_src_isexc_excl(brmctx, pg, h_addr, srcs, nsrcs, |
| addr_size, grec_type); |
| break; |
| } |
| |
| pg->filter_mode = MCAST_EXCLUDE; |
| mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx)); |
| |
| 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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, |
| int grec_type) |
| { |
| 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_idx * addr_size), addr_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(brmctx)); |
| } |
| |
| if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, |
| grec_type)) |
| changed = true; |
| |
| if (to_send) |
| __grp_src_query_marked_and_rexmit(brmctx, pmctx, 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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, |
| int grec_type) |
| { |
| 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_idx * addr_size), addr_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(brmctx)); |
| } |
| |
| if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, |
| grec_type)) |
| changed = true; |
| |
| if (to_send) |
| __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); |
| |
| __grp_send_query_and_rexmit(brmctx, pmctx, pg); |
| |
| return changed; |
| } |
| |
| static bool br_multicast_toin(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, |
| int grec_type) |
| { |
| bool changed = false; |
| |
| switch (pg->filter_mode) { |
| case MCAST_INCLUDE: |
| changed = __grp_src_toin_incl(brmctx, pmctx, pg, h_addr, srcs, |
| nsrcs, addr_size, grec_type); |
| break; |
| case MCAST_EXCLUDE: |
| changed = __grp_src_toin_excl(brmctx, pmctx, pg, h_addr, srcs, |
| nsrcs, addr_size, grec_type); |
| break; |
| } |
| |
| if (br_multicast_eht_should_del_pg(pg)) { |
| pg->flags |= MDB_PG_FLAGS_FAST_LEAVE; |
| br_multicast_find_del_pg(pg->key.port->br, pg); |
| /* a notification has already been sent and we shouldn't |
| * access pg after the delete so we have to return false |
| */ |
| changed = false; |
| } |
| |
| 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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, |
| int grec_type) |
| { |
| 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_idx * addr_size), addr_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); |
| } |
| |
| br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, |
| grec_type); |
| |
| __grp_src_delete_marked(pg); |
| if (to_send) |
| __grp_src_query_marked_and_rexmit(brmctx, pmctx, 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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, |
| int grec_type) |
| { |
| 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_idx * addr_size), addr_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++; |
| } |
| } |
| |
| if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, |
| grec_type)) |
| changed = true; |
| |
| if (__grp_src_delete_marked(pg)) |
| changed = true; |
| if (to_send) |
| __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); |
| |
| return changed; |
| } |
| |
| static bool br_multicast_toex(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, |
| int grec_type) |
| { |
| bool changed = false; |
| |
| switch (pg->filter_mode) { |
| case MCAST_INCLUDE: |
| __grp_src_toex_incl(brmctx, pmctx, pg, h_addr, srcs, nsrcs, |
| addr_size, grec_type); |
| br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE); |
| changed = true; |
| break; |
| case MCAST_EXCLUDE: |
| changed = __grp_src_toex_excl(brmctx, pmctx, pg, h_addr, srcs, |
| nsrcs, addr_size, grec_type); |
| break; |
| } |
| |
| pg->filter_mode = MCAST_EXCLUDE; |
| mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx)); |
| |
| return changed; |
| } |
| |
| /* State Msg type New state Actions |
| * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B) |
| */ |
| static bool __grp_src_block_incl(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, int grec_type) |
| { |
| 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_idx * addr_size), addr_size); |
| ent = br_multicast_find_group_src(pg, &src_ip); |
| if (ent) { |
| ent->flags |= BR_SGRP_F_SEND; |
| to_send++; |
| } |
| } |
| |
| if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, |
| grec_type)) |
| changed = true; |
| |
| if (to_send) |
| __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); |
| |
| return changed; |
| } |
| |
| /* 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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, int grec_type) |
| { |
| 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_idx * addr_size), addr_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++; |
| } |
| } |
| |
| if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, |
| grec_type)) |
| changed = true; |
| |
| if (to_send) |
| __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); |
| |
| return changed; |
| } |
| |
| static bool br_multicast_block(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct net_bridge_port_group *pg, void *h_addr, |
| void *srcs, u32 nsrcs, size_t addr_size, int grec_type) |
| { |
| bool changed = false; |
| |
| switch (pg->filter_mode) { |
| case MCAST_INCLUDE: |
| changed = __grp_src_block_incl(brmctx, pmctx, pg, h_addr, srcs, |
| nsrcs, addr_size, grec_type); |
| break; |
| case MCAST_EXCLUDE: |
| changed = __grp_src_block_excl(brmctx, pmctx, pg, h_addr, srcs, |
| nsrcs, addr_size, grec_type); |
| break; |
| } |
| |
| if ((pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) || |
| br_multicast_eht_should_del_pg(pg)) { |
| if (br_multicast_eht_should_del_pg(pg)) |
| pg->flags |= MDB_PG_FLAGS_FAST_LEAVE; |
| br_multicast_find_del_pg(pg->key.port->br, pg); |
| /* a notification has already been sent and we shouldn't |
| * access pg after the delete so we have to return false |
| */ |
| changed = false; |
| } |
| |
| 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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct sk_buff *skb, |
| u16 vid) |
| { |
| bool igmpv2 = brmctx->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; |
| __be32 group, *h_addr; |
| bool changed = false; |
| 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 (!pmctx || igmpv2) { |
| br_ip4_multicast_leave_group(brmctx, pmctx, |
| group, vid, src); |
| continue; |
| } |
| } else { |
| err = br_ip4_multicast_add_group(brmctx, pmctx, group, |
| vid, src, igmpv2); |
| if (err) |
| break; |
| } |
| |
| if (!pmctx || igmpv2) |
| continue; |
| |
| spin_lock(&brmctx->br->multicast_lock); |
| if (!br_multicast_ctx_should_use(brmctx, pmctx)) |
| goto unlock_continue; |
| |
| mdst = br_mdb_ip4_get(brmctx->br, group, vid); |
| if (!mdst) |
| goto unlock_continue; |
| pg = br_multicast_find_port(mdst, pmctx->port, src); |
| if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) |
| goto unlock_continue; |
| /* reload grec and host addr */ |
| grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4)); |
| h_addr = &ip_hdr(skb)->saddr; |
| switch (type) { |
| case IGMPV3_ALLOW_NEW_SOURCES: |
| changed = br_multicast_isinc_allow(brmctx, pg, h_addr, |
| grec->grec_src, |
| nsrcs, sizeof(__be32), type); |
| break; |
| case IGMPV3_MODE_IS_INCLUDE: |
| changed = br_multicast_isinc_allow(brmctx, pg, h_addr, |
| grec->grec_src, |
| nsrcs, sizeof(__be32), type); |
| break; |
| case IGMPV3_MODE_IS_EXCLUDE: |
| changed = br_multicast_isexc(brmctx, pg, h_addr, |
| grec->grec_src, |
| nsrcs, sizeof(__be32), type); |
| break; |
| case IGMPV3_CHANGE_TO_INCLUDE: |
| changed = br_multicast_toin(brmctx, pmctx, pg, h_addr, |
| grec->grec_src, |
| nsrcs, sizeof(__be32), type); |
| break; |
| case IGMPV3_CHANGE_TO_EXCLUDE: |
| changed = br_multicast_toex(brmctx, pmctx, pg, h_addr, |
| grec->grec_src, |
| nsrcs, sizeof(__be32), type); |
| break; |
| case IGMPV3_BLOCK_OLD_SOURCES: |
| changed = br_multicast_block(brmctx, pmctx, pg, h_addr, |
| grec->grec_src, |
| nsrcs, sizeof(__be32), type); |
| break; |
| } |
| if (changed) |
| br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB); |
| unlock_continue: |
| spin_unlock(&brmctx->br->multicast_lock); |
| } |
| |
| return err; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct sk_buff *skb, |
| u16 vid) |
| { |
| bool mldv1 = brmctx->multicast_mld_version == 1; |
| struct net_bridge_mdb_entry *mdst; |
| struct net_bridge_port_group *pg; |
| unsigned int nsrcs_offset; |
| struct mld2_report *mld2r; |
| const unsigned char *src; |
| struct in6_addr *h_addr; |
| 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(*mld2r))) |
| return -EINVAL; |
| |
| mld2r = (struct mld2_report *)icmp6_hdr(skb); |
| num = ntohs(mld2r->mld2r_ngrec); |
| len = skb_transport_offset(skb) + sizeof(*mld2r); |
| |
| 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 (!pmctx || mldv1) { |
| br_ip6_multicast_leave_group(brmctx, pmctx, |
| &grec->grec_mca, |
| vid, src); |
| continue; |
| } |
| } else { |
| err = br_ip6_multicast_add_group(brmctx, pmctx, |
| &grec->grec_mca, vid, |
| src, mldv1); |
| if (err) |
| break; |
| } |
| |
| if (!pmctx || mldv1) |
| continue; |
| |
| spin_lock(&brmctx->br->multicast_lock); |
| if (!br_multicast_ctx_should_use(brmctx, pmctx)) |
| goto unlock_continue; |
| |
| mdst = br_mdb_ip6_get(brmctx->br, &grec->grec_mca, vid); |
| if (!mdst) |
| goto unlock_continue; |
| pg = br_multicast_find_port(mdst, pmctx->port, src); |
| if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) |
| goto unlock_continue; |
| h_addr = &ipv6_hdr(skb)->saddr; |
| switch (grec->grec_type) { |
| case MLD2_ALLOW_NEW_SOURCES: |
| changed = br_multicast_isinc_allow(brmctx, pg, h_addr, |
| grec->grec_src, nsrcs, |
| sizeof(struct in6_addr), |
| grec->grec_type); |
| break; |
| case MLD2_MODE_IS_INCLUDE: |
| changed = br_multicast_isinc_allow(brmctx, pg, h_addr, |
| grec->grec_src, nsrcs, |
| sizeof(struct in6_addr), |
| grec->grec_type); |
| break; |
| case MLD2_MODE_IS_EXCLUDE: |
| changed = br_multicast_isexc(brmctx, pg, h_addr, |
| grec->grec_src, nsrcs, |
| sizeof(struct in6_addr), |
| grec->grec_type); |
| break; |
| case MLD2_CHANGE_TO_INCLUDE: |
| changed = br_multicast_toin(brmctx, pmctx, pg, h_addr, |
| grec->grec_src, nsrcs, |
| sizeof(struct in6_addr), |
| grec->grec_type); |
| break; |
| case MLD2_CHANGE_TO_EXCLUDE: |
| changed = br_multicast_toex(brmctx, pmctx, pg, h_addr, |
| grec->grec_src, nsrcs, |
| sizeof(struct in6_addr), |
| grec->grec_type); |
| break; |
| case MLD2_BLOCK_OLD_SOURCES: |
| changed = br_multicast_block(brmctx, pmctx, pg, h_addr, |
| grec->grec_src, nsrcs, |
| sizeof(struct in6_addr), |
| grec->grec_type); |
| break; |
| } |
| if (changed) |
| br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB); |
| unlock_continue: |
| spin_unlock(&brmctx->br->multicast_lock); |
| } |
| |
| return err; |
| } |
| #endif |
| |
| static bool br_multicast_select_querier(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct br_ip *saddr) |
| { |
| int port_ifidx = pmctx ? pmctx->port->dev->ifindex : 0; |
| struct timer_list *own_timer, *other_timer; |
| struct bridge_mcast_querier *querier; |
| |
| switch (saddr->proto) { |
| case htons(ETH_P_IP): |
| querier = &brmctx->ip4_querier; |
| own_timer = &brmctx->ip4_own_query.timer; |
| other_timer = &brmctx->ip4_other_query.timer; |
| if (!querier->addr.src.ip4 || |
| ntohl(saddr->src.ip4) <= ntohl(querier->addr.src.ip4)) |
| goto update; |
| break; |
| #if IS_ENABLED(CONFIG_IPV6) |
| case htons(ETH_P_IPV6): |
| querier = &brmctx->ip6_querier; |
| own_timer = &brmctx->ip6_own_query.timer; |
| other_timer = &brmctx->ip6_other_query.timer; |
| if (ipv6_addr_cmp(&saddr->src.ip6, &querier->addr.src.ip6) <= 0) |
| goto update; |
| break; |
| #endif |
| default: |
| return false; |
| } |
| |
| if (!timer_pending(own_timer) && !timer_pending(other_timer)) |
| goto update; |
| |
| return false; |
| |
| update: |
| br_multicast_update_querier(brmctx, querier, port_ifidx, saddr); |
| |
| return true; |
| } |
| |
| static struct net_bridge_port * |
| __br_multicast_get_querier_port(struct net_bridge *br, |
| const struct bridge_mcast_querier *querier) |
| { |
| int port_ifidx = READ_ONCE(querier->port_ifidx); |
| struct net_bridge_port *p; |
| struct net_device *dev; |
| |
| if (port_ifidx == 0) |
| return NULL; |
| |
| dev = dev_get_by_index_rcu(dev_net(br->dev), port_ifidx); |
| if (!dev) |
| return NULL; |
| p = br_port_get_rtnl_rcu(dev); |
| if (!p || p->br != br) |
| return NULL; |
| |
| return p; |
| } |
| |
| size_t br_multicast_querier_state_size(void) |
| { |
| return nla_total_size(0) + /* nest attribute */ |
| nla_total_size(sizeof(__be32)) + /* BRIDGE_QUERIER_IP_ADDRESS */ |
| nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IP_PORT */ |
| nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IP_OTHER_TIMER */ |
| #if IS_ENABLED(CONFIG_IPV6) |
| nla_total_size(sizeof(struct in6_addr)) + /* BRIDGE_QUERIER_IPV6_ADDRESS */ |
| nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IPV6_PORT */ |
| nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IPV6_OTHER_TIMER */ |
| #endif |
| 0; |
| } |
| |
| /* protected by rtnl or rcu */ |
| int br_multicast_dump_querier_state(struct sk_buff *skb, |
| const struct net_bridge_mcast *brmctx, |
| int nest_attr) |
| { |
| struct bridge_mcast_querier querier = {}; |
| struct net_bridge_port *p; |
| struct nlattr *nest; |
| |
| if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) || |
| br_multicast_ctx_vlan_global_disabled(brmctx)) |
| return 0; |
| |
| nest = nla_nest_start(skb, nest_attr); |
| if (!nest) |
| return -EMSGSIZE; |
| |
| rcu_read_lock(); |
| if (!brmctx->multicast_querier && |
| !timer_pending(&brmctx->ip4_other_query.timer)) |
| goto out_v6; |
| |
| br_multicast_read_querier(&brmctx->ip4_querier, &querier); |
| if (nla_put_in_addr(skb, BRIDGE_QUERIER_IP_ADDRESS, |
| querier.addr.src.ip4)) { |
| rcu_read_unlock(); |
| goto out_err; |
| } |
| |
| p = __br_multicast_get_querier_port(brmctx->br, &querier); |
| if (timer_pending(&brmctx->ip4_other_query.timer) && |
| (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IP_OTHER_TIMER, |
| br_timer_value(&brmctx->ip4_other_query.timer), |
| BRIDGE_QUERIER_PAD) || |
| (p && nla_put_u32(skb, BRIDGE_QUERIER_IP_PORT, p->dev->ifindex)))) { |
| rcu_read_unlock(); |
| goto out_err; |
| } |
| |
| out_v6: |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (!brmctx->multicast_querier && |
| !timer_pending(&brmctx->ip6_other_query.timer)) |
| goto out; |
| |
| br_multicast_read_querier(&brmctx->ip6_querier, &querier); |
| if (nla_put_in6_addr(skb, BRIDGE_QUERIER_IPV6_ADDRESS, |
| &querier.addr.src.ip6)) { |
| rcu_read_unlock(); |
| goto out_err; |
| } |
| |
| p = __br_multicast_get_querier_port(brmctx->br, &querier); |
| if (timer_pending(&brmctx->ip6_other_query.timer) && |
| (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IPV6_OTHER_TIMER, |
| br_timer_value(&brmctx->ip6_other_query.timer), |
| BRIDGE_QUERIER_PAD) || |
| (p && nla_put_u32(skb, BRIDGE_QUERIER_IPV6_PORT, |
| p->dev->ifindex)))) { |
| rcu_read_unlock(); |
| goto out_err; |
| } |
| out: |
| #endif |
| rcu_read_unlock(); |
| nla_nest_end(skb, nest); |
| if (!nla_len(nest)) |
| nla_nest_cancel(skb, nest); |
| |
| return 0; |
| |
| out_err: |
| nla_nest_cancel(skb, nest); |
| return -EMSGSIZE; |
| } |
| |
| static void |
| br_multicast_update_query_timer(struct net_bridge_mcast *brmctx, |
| 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 + brmctx->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, NULL); |
| } |
| |
| static struct net_bridge_port * |
| br_multicast_rport_from_node(struct net_bridge_mcast *brmctx, |
| struct hlist_head *mc_router_list, |
| struct hlist_node *rlist) |
| { |
| struct net_bridge_mcast_port *pmctx; |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (mc_router_list == &brmctx->ip6_mc_router_list) |
| pmctx = hlist_entry(rlist, struct net_bridge_mcast_port, |
| ip6_rlist); |
| else |
| #endif |
| pmctx = hlist_entry(rlist, struct net_bridge_mcast_port, |
| ip4_rlist); |
| |
| return pmctx->port; |
| } |
| |
| static struct hlist_node * |
| br_multicast_get_rport_slot(struct net_bridge_mcast *brmctx, |
| struct net_bridge_port *port, |
| struct hlist_head *mc_router_list) |
| |
| { |
| struct hlist_node *slot = NULL; |
| struct net_bridge_port *p; |
| struct hlist_node *rlist; |
| |
| hlist_for_each(rlist, mc_router_list) { |
| p = br_multicast_rport_from_node(brmctx, mc_router_list, rlist); |
| |
| if ((unsigned long)port >= (unsigned long)p) |
| break; |
| |
| slot = rlist; |
| } |
| |
| return slot; |
| } |
| |
| static bool br_multicast_no_router_otherpf(struct net_bridge_mcast_port *pmctx, |
| struct hlist_node *rnode) |
| { |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (rnode != &pmctx->ip6_rlist) |
| return hlist_unhashed(&pmctx->ip6_rlist); |
| else |
| return hlist_unhashed(&pmctx->ip4_rlist); |
| #else |
| return true; |
| #endif |
| } |
| |
| /* 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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct hlist_node *rlist, |
| struct hlist_head *mc_router_list) |
| { |
| struct hlist_node *slot; |
| |
| if (!hlist_unhashed(rlist)) |
| return; |
| |
| slot = br_multicast_get_rport_slot(brmctx, pmctx->port, mc_router_list); |
| |
| if (slot) |
| hlist_add_behind_rcu(rlist, slot); |
| else |
| hlist_add_head_rcu(rlist, mc_router_list); |
| |
| /* For backwards compatibility for now, only notify if we |
| * switched from no IPv4/IPv6 multicast router to a new |
| * IPv4 or IPv6 multicast router. |
| */ |
| if (br_multicast_no_router_otherpf(pmctx, rlist)) { |
| br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_NEWMDB); |
| br_port_mc_router_state_change(pmctx->port, true); |
| } |
| } |
| |
| /* Add port to router_list |
| * list is maintained ordered by pointer value |
| * and locked by br->multicast_lock and RCU |
| */ |
| static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx) |
| { |
| br_multicast_add_router(brmctx, pmctx, &pmctx->ip4_rlist, |
| &brmctx->ip4_mc_router_list); |
| } |
| |
| /* Add port to router_list |
| * list is maintained ordered by pointer value |
| * and locked by br->multicast_lock and RCU |
| */ |
| static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx) |
| { |
| #if IS_ENABLED(CONFIG_IPV6) |
| br_multicast_add_router(brmctx, pmctx, &pmctx->ip6_rlist, |
| &brmctx->ip6_mc_router_list); |
| #endif |
| } |
| |
| static void br_multicast_mark_router(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct timer_list *timer, |
| struct hlist_node *rlist, |
| struct hlist_head *mc_router_list) |
| { |
| unsigned long now = jiffies; |
| |
| if (!br_multicast_ctx_should_use(brmctx, pmctx)) |
| return; |
| |
| if (!pmctx) { |
| if (brmctx->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) { |
| if (!br_ip4_multicast_is_router(brmctx) && |
| !br_ip6_multicast_is_router(brmctx)) |
| br_mc_router_state_change(brmctx->br, true); |
| mod_timer(timer, now + brmctx->multicast_querier_interval); |
| } |
| return; |
| } |
| |
| if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED || |
| pmctx->multicast_router == MDB_RTR_TYPE_PERM) |
| return; |
| |
| br_multicast_add_router(brmctx, pmctx, rlist, mc_router_list); |
| mod_timer(timer, now + brmctx->multicast_querier_interval); |
| } |
| |
| static void br_ip4_multicast_mark_router(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx) |
| { |
| struct timer_list *timer = &brmctx->ip4_mc_router_timer; |
| struct hlist_node *rlist = NULL; |
| |
| if (pmctx) { |
| timer = &pmctx->ip4_mc_router_timer; |
| rlist = &pmctx->ip4_rlist; |
| } |
| |
| br_multicast_mark_router(brmctx, pmctx, timer, rlist, |
| &brmctx->ip4_mc_router_list); |
| } |
| |
| static void br_ip6_multicast_mark_router(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx) |
| { |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct timer_list *timer = &brmctx->ip6_mc_router_timer; |
| struct hlist_node *rlist = NULL; |
| |
| if (pmctx) { |
| timer = &pmctx->ip6_mc_router_timer; |
| rlist = &pmctx->ip6_rlist; |
| } |
| |
| br_multicast_mark_router(brmctx, pmctx, timer, rlist, |
| &brmctx->ip6_mc_router_list); |
| #endif |
| } |
| |
| static void |
| br_ip4_multicast_query_received(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct bridge_mcast_other_query *query, |
| struct br_ip *saddr, |
| unsigned long max_delay) |
| { |
| if (!br_multicast_select_querier(brmctx, pmctx, saddr)) |
| return; |
| |
| br_multicast_update_query_timer(brmctx, query, max_delay); |
| br_ip4_multicast_mark_router(brmctx, pmctx); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static void |
| br_ip6_multicast_query_received(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct bridge_mcast_other_query *query, |
| struct br_ip *saddr, |
| unsigned long max_delay) |
| { |
| if (!br_multicast_select_querier(brmctx, pmctx, saddr)) |
| return; |
| |
| br_multicast_update_query_timer(brmctx, query, max_delay); |
| br_ip6_multicast_mark_router(brmctx, pmctx); |
| } |
| #endif |
| |
| static void br_ip4_multicast_query(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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(&brmctx->br->multicast_lock); |
| if (!br_multicast_ctx_should_use(brmctx, pmctx)) |
| 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 || |
| (brmctx->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_ip4_multicast_query_received(brmctx, pmctx, |
| &brmctx->ip4_other_query, |
| &saddr, max_delay); |
| goto out; |
| } |
| |
| mp = br_mdb_ip4_get(brmctx->br, group, vid); |
| if (!mp) |
| goto out; |
| |
| max_delay *= brmctx->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, brmctx->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 && |
| (brmctx->multicast_igmp_version == 2 || |
| p->filter_mode == MCAST_EXCLUDE)) |
| mod_timer(&p->timer, now + max_delay); |
| } |
| |
| out: |
| spin_unlock(&brmctx->br->multicast_lock); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static int br_ip6_multicast_query(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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(&brmctx->br->multicast_lock); |
| if (!br_multicast_ctx_should_use(brmctx, pmctx)) |
| 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 (brmctx->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_ip6_multicast_query_received(brmctx, pmctx, |
| &brmctx->ip6_other_query, |
| &saddr, max_delay); |
| goto out; |
| } else if (!group) { |
| goto out; |
| } |
| |
| mp = br_mdb_ip6_get(brmctx->br, group, vid); |
| if (!mp) |
| goto out; |
| |
| max_delay *= brmctx->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, brmctx->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 && |
| (brmctx->multicast_mld_version == 1 || |
| p->filter_mode == MCAST_EXCLUDE)) |
| mod_timer(&p->timer, now + max_delay); |
| } |
| |
| out: |
| spin_unlock(&brmctx->br->multicast_lock); |
| return err; |
| } |
| #endif |
| |
| static void |
| br_multicast_leave_group(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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(&brmctx->br->multicast_lock); |
| if (!br_multicast_ctx_should_use(brmctx, pmctx)) |
| goto out; |
| |
| mp = br_mdb_ip_get(brmctx->br, group); |
| if (!mp) |
| goto out; |
| |
| if (pmctx && (pmctx->port->flags & BR_MULTICAST_FAST_LEAVE)) { |
| struct net_bridge_port_group __rcu **pp; |
| |
| for (pp = &mp->ports; |
| (p = mlock_dereference(*pp, brmctx->br)) != NULL; |
| pp = &p->next) { |
| if (!br_port_group_equal(p, pmctx->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 (brmctx->multicast_querier) { |
| __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &mp->addr, |
| false, 0, NULL); |
| |
| time = jiffies + brmctx->multicast_last_member_count * |
| brmctx->multicast_last_member_interval; |
| |
| mod_timer(&own_query->timer, time); |
| |
| for (p = mlock_dereference(mp->ports, brmctx->br); |
| p != NULL && pmctx != NULL; |
| p = mlock_dereference(p->next, brmctx->br)) { |
| if (!br_port_group_equal(p, pmctx->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 + brmctx->multicast_last_member_count * |
| brmctx->multicast_last_member_interval; |
| |
| if (!pmctx) { |
| 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, brmctx->br); |
| p != NULL; |
| p = mlock_dereference(p->next, brmctx->br)) { |
| if (p->key.port != pmctx->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(&brmctx->br->multicast_lock); |
| } |
| |
| static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| __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 = pmctx ? &pmctx->ip4_own_query : &brmctx->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(brmctx, pmctx, &br_group, |
| &brmctx->ip4_other_query, |
| own_query, src); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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 = pmctx ? &pmctx->ip6_own_query : &brmctx->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(brmctx, pmctx, &br_group, |
| &brmctx->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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| 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(&brmctx->br->multicast_lock); |
| br_ip4_multicast_mark_router(brmctx, pmctx); |
| spin_unlock(&brmctx->br->multicast_lock); |
| } |
| |
| static int br_ip4_multicast_mrd_rcv(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct sk_buff *skb) |
| { |
| if (ip_hdr(skb)->protocol != IPPROTO_IGMP || |
| igmp_hdr(skb)->type != IGMP_MRDISC_ADV) |
| return -ENOMSG; |
| |
| spin_lock(&brmctx->br->multicast_lock); |
| br_ip4_multicast_mark_router(brmctx, pmctx); |
| spin_unlock(&brmctx->br->multicast_lock); |
| |
| return 0; |
| } |
| |
| static int br_multicast_ipv4_rcv(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct sk_buff *skb, |
| u16 vid) |
| { |
| struct net_bridge_port *p = pmctx ? pmctx->port : NULL; |
| 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(brmctx, pmctx, skb); |
| } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) { |
| br_ip4_multicast_mrd_rcv(brmctx, pmctx, skb); |
| } |
| |
| return 0; |
| } else if (err < 0) { |
| br_multicast_err_count(brmctx->br, p, 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(brmctx, pmctx, ih->group, vid, |
| src, true); |
| break; |
| case IGMPV3_HOST_MEMBERSHIP_REPORT: |
| err = br_ip4_multicast_igmp3_report(brmctx, pmctx, skb, vid); |
| break; |
| case IGMP_HOST_MEMBERSHIP_QUERY: |
| br_ip4_multicast_query(brmctx, pmctx, skb, vid); |
| break; |
| case IGMP_HOST_LEAVE_MESSAGE: |
| br_ip4_multicast_leave_group(brmctx, pmctx, ih->group, vid, src); |
| break; |
| } |
| |
| br_multicast_count(brmctx->br, p, 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_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct sk_buff *skb) |
| { |
| if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV) |
| return; |
| |
| spin_lock(&brmctx->br->multicast_lock); |
| br_ip6_multicast_mark_router(brmctx, pmctx); |
| spin_unlock(&brmctx->br->multicast_lock); |
| } |
| |
| static int br_multicast_ipv6_rcv(struct net_bridge_mcast *brmctx, |
| struct net_bridge_mcast_port *pmctx, |
| struct sk_buff *skb, |
| u16 vid) |
| { |
| struct net_bridge_port *p = pmctx ? pmctx->port : NULL; |
| 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(brmctx, pmctx, skb); |
| |
| return 0; |
| } else if (err < 0) { |
| br_multicast_err_count(brmctx->br, p, 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(brmctx, pmctx, &mld->mld_mca, |
| vid, src, true); |
| break; |
| case ICMPV6_MLD2_REPORT: |
| err = br_ip6_multicast_mld2_report(brmctx, pmctx, skb, vid); |
| break; |
| case ICMPV6_MGM_QUERY: |
| err = br_ip6_multicast_query(brmctx, pmctx, skb, vid); |
| break; |
| case ICMPV6_MGM_REDUCTION: |
| src = eth_hdr(skb)->h_source; |
| br_ip6_multicast_leave_group(brmctx, pmctx, &mld->mld_mca, vid, |
| src); |
| break; |
| } |
| |
| br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp, |
| BR_MCAST_DIR_RX); |
| |
| return err; |
| } |
| #endif |
| |
| int br_multicast_rcv(struct net_bridge_mcast **brmctx, |
| struct net_bridge_mcast_port **pmctx, |
| struct net_bridge_vlan *vlan, |
| 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((*brmctx)->br, BROPT_MULTICAST_ENABLED)) |
| return 0; |
| |
| if (br_opt_get((*brmctx)->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && vlan) { |
| const struct net_bridge_vlan *masterv; |
| |
| /* the vlan has the master flag set only when transmitting |
| * through the bridge device |
| */ |
| if (br_vlan_is_master(vlan)) { |
| masterv = vlan; |
| *brmctx = &vlan->br_mcast_ctx; |
| *pmctx = NULL; |
| } else { |
| masterv = vlan->brvlan; |
| *brmctx = &vlan->brvlan->br_mcast_ctx; |
| *pmctx = &vlan->port_mcast_ctx; |
| } |
| |
| if (!(masterv->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) |
| return 0; |
| } |
| |
| switch (skb->protocol) { |
| case htons(ETH_P_IP): |
| ret = br_multicast_ipv4_rcv(*brmctx, *pmctx, skb, vid); |
| break; |
| #if IS_ENABLED(CONFIG_IPV6) |
| case htons(ETH_P_IPV6): |
| ret = br_multicast_ipv6_rcv(*brmctx, *pmctx, skb, vid); |
| break; |
| #endif |
| } |
| |
| return ret; |
| } |
| |
| static void br_multicast_query_expired(struct net_bridge_mcast *brmctx, |
| struct bridge_mcast_own_query *query, |
| struct bridge_mcast_querier *querier) |
| { |
| spin_lock(&brmctx->br->multicast_lock); |
| if (br_multicast_ctx_vlan_disabled(brmctx)) |
| goto out; |
| |
| if (query->startup_sent < brmctx->multicast_startup_query_count) |
| query->startup_sent++; |
| |
| br_multicast_send_query(brmctx, NULL, query); |
| out: |
| spin_unlock(&brmctx->br->multicast_lock); |
| } |
| |
| static void br_ip4_multicast_query_expired(struct timer_list *t) |
| { |
| struct net_bridge_mcast *brmctx = from_timer(brmctx, t, |
| ip4_own_query.timer); |
| |
| br_multicast_query_expired(brmctx, &brmctx->ip4_own_query, |
| &brmctx->ip4_querier); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static void br_ip6_multicast_query_expired(struct timer_list *t) |
| { |
| struct net_bridge_mcast *brmctx = from_timer(brmctx, t, |
| ip6_own_query.timer); |
| |
| br_multicast_query_expired(brmctx, &brmctx->ip6_own_query, |
| &brmctx->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_ctx_init(struct net_bridge *br, |
| struct net_bridge_vlan *vlan, |
| struct net_bridge_mcast *brmctx) |
| { |
| brmctx->br = br; |
| brmctx->vlan = vlan; |
| brmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; |
| brmctx->multicast_last_member_count = 2; |
| brmctx->multicast_startup_query_count = 2; |
| |
| brmctx->multicast_last_member_interval = HZ; |
| brmctx->multicast_query_response_interval = 10 * HZ; |
| brmctx->multicast_startup_query_interval = 125 * HZ / 4; |
| brmctx->multicast_query_interval = 125 * HZ; |
| brmctx->multicast_querier_interval = 255 * HZ; |
| brmctx->multicast_membership_interval = 260 * HZ; |
| |
| brmctx->ip4_other_query.delay_time = 0; |
| brmctx->ip4_querier.port_ifidx = 0; |
| seqcount_spinlock_init(&brmctx->ip4_querier.seq, &br->multicast_lock); |
| brmctx->multicast_igmp_version = 2; |
| #if IS_ENABLED(CONFIG_IPV6) |
| brmctx->multicast_mld_version = 1; |
| brmctx->ip6_other_query.delay_time = 0; |
| brmctx->ip6_querier.port_ifidx = 0; |
| seqcount_spinlock_init(&brmctx->ip6_querier.seq, &br->multicast_lock); |
| #endif |
| |
| timer_setup(&brmctx->ip4_mc_router_timer, |
| br_ip4_multicast_local_router_expired, 0); |
| timer_setup(&brmctx->ip4_other_query.timer, |
| br_ip4_multicast_querier_expired, 0); |
| timer_setup(&brmctx->ip4_own_query.timer, |
| br_ip4_multicast_query_expired, 0); |
| #if IS_ENABLED(CONFIG_IPV6) |
| timer_setup(&brmctx->ip6_mc_router_timer, |
| br_ip6_multicast_local_router_expired, 0); |
| timer_setup(&brmctx->ip6_other_query.timer, |
| br_ip6_multicast_querier_expired, 0); |
| timer_setup(&brmctx->ip6_own_query.timer, |
| br_ip6_multicast_query_expired, 0); |
| #endif |
| } |
| |
| void br_multicast_ctx_deinit(struct net_bridge_mcast *brmctx) |
| { |
| __br_multicast_stop(brmctx); |
| } |
| |
| void br_multicast_init(struct net_bridge *br) |
| { |
| br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX; |
| |
| br_multicast_ctx_init(br, NULL, &br->multicast_ctx); |
| |
| br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true); |
| br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); |
| |
| spin_lock_init(&br->multicast_lock); |
| 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_query(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); |
| } |
| |
| static void __br_multicast_open(struct net_bridge_mcast *brmctx) |
| { |
| __br_multicast_open_query(brmctx->br, &brmctx->ip4_own_query); |
| #if IS_ENABLED(CONFIG_IPV6) |
| __br_multicast_open_query(brmctx->br, &brmctx->ip6_own_query); |
| #endif |
| } |
| |
| void br_multicast_open(struct net_bridge *br) |
| { |
| ASSERT_RTNL(); |
| |
| if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { |
| struct net_bridge_vlan_group *vg; |
| struct net_bridge_vlan *vlan; |
| |
| vg = br_vlan_group(br); |
| if (vg) { |
| list_for_each_entry(vlan, &vg->vlan_list, vlist) { |
| struct net_bridge_mcast *brmctx; |
| |
| brmctx = &vlan->br_mcast_ctx; |
| if (br_vlan_is_brentry(vlan) && |
| !br_multicast_ctx_vlan_disabled(brmctx)) |
| __br_multicast_open(&vlan->br_mcast_ctx); |
| } |
| } |
| } else { |
| __br_multicast_open(&br->multicast_ctx); |
| } |
| } |
| |
| static void __br_multicast_stop(struct net_bridge_mcast *brmctx) |
| { |
| del_timer_sync(&brmctx->ip4_mc_router_timer); |
| del_timer_sync(&brmctx->ip4_other_query.timer); |
| del_timer_sync(&brmctx->ip4_own_query.timer); |
| #if IS_ENABLED(CONFIG_IPV6) |
| del_timer_sync(&brmctx->ip6_mc_router_timer); |
| del_timer_sync(&brmctx->ip6_other_query.timer); |
| del_timer_sync(&brmctx->ip6_own_query.timer); |
| #endif |
| } |
| |
| void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on) |
| { |
| struct net_bridge *br; |
| |
| /* it's okay to check for the flag without the multicast lock because it |
| * can only change under RTNL -> multicast_lock, we need the latter to |
| * sync with timers and packets |
| */ |
| if (on == !!(vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) |
| return; |
| |
| if (br_vlan_is_master(vlan)) { |
| br = vlan->br; |
| |
| if (!br_vlan_is_brentry(vlan) || |
| (on && |
| br_multicast_ctx_vlan_global_disabled(&vlan->br_mcast_ctx))) |
| return; |
| |
| spin_lock_bh(&br->multicast_lock); |
| vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED; |
| spin_unlock_bh(&br->multicast_lock); |
| |
| if (on) |
| __br_multicast_open(&vlan->br_mcast_ctx); |
| else |
| __br_multicast_stop(&vlan->br_mcast_ctx); |
| } else { |
| struct net_bridge_mcast *brmctx; |
| |
| brmctx = br_multicast_port_ctx_get_global(&vlan->port_mcast_ctx); |
| if (on && br_multicast_ctx_vlan_global_disabled(brmctx)) |
| return; |
| |
| br = vlan->port->br; |
| spin_lock_bh(&br->multicast_lock); |
| vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED; |
| if (on) |
| __br_multicast_enable_port_ctx(&vlan->port_mcast_ctx); |
| else |
| __br_multicast_disable_port_ctx(&vlan->port_mcast_ctx); |
| spin_unlock_bh(&br->multicast_lock); |
| } |
| } |
| |
| static void br_multicast_toggle_vlan(struct net_bridge_vlan *vlan, bool on) |
| { |
| struct net_bridge_port *p; |
| |
| if (WARN_ON_ONCE(!br_vlan_is_master(vlan))) |
| return; |
| |
| list_for_each_entry(p, &vlan->br->port_list, list) { |
| struct net_bridge_vlan *vport; |
| |
| vport = br_vlan_find(nbp_vlan_group(p), vlan->vid); |
| if (!vport) |
| continue; |
| br_multicast_toggle_one_vlan(vport, on); |
| } |
| |
| if (br_vlan_is_brentry(vlan)) |
| br_multicast_toggle_one_vlan(vlan, on); |
| } |
| |
| int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on, |
| struct netlink_ext_ack *extack) |
| { |
| struct net_bridge_vlan_group *vg; |
| struct net_bridge_vlan *vlan; |
| struct net_bridge_port *p; |
| |
| if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) == on) |
| return 0; |
| |
| if (on && !br_opt_get(br, BROPT_VLAN_ENABLED)) { |
| NL_SET_ERR_MSG_MOD(extack, "Cannot enable multicast vlan snooping with vlan filtering disabled"); |
| return -EINVAL; |
| } |
| |
| vg = br_vlan_group(br); |
| if (!vg) |
| return 0; |
| |
| br_opt_toggle(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED, on); |
| |
| /* disable/enable non-vlan mcast contexts based on vlan snooping */ |
| if (on) |
| __br_multicast_stop(&br->multicast_ctx); |
| else |
| __br_multicast_open(&br->multicast_ctx); |
| list_for_each_entry(p, &br->port_list, list) { |
| if (on) |
| br_multicast_disable_port(p); |
| else |
| br_multicast_enable_port(p); |
| } |
| |
| list_for_each_entry(vlan, &vg->vlan_list, vlist) |
| br_multicast_toggle_vlan(vlan, on); |
| |
| return 0; |
| } |
| |
| bool br_multicast_toggle_global_vlan(struct net_bridge_vlan *vlan, bool on) |
| { |
| ASSERT_RTNL(); |
| |
| /* BR_VLFLAG_GLOBAL_MCAST_ENABLED relies on eventual consistency and |
| * requires only RTNL to change |
| */ |
| if (on == !!(vlan->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) |
| return false; |
| |
| vlan->priv_flags ^= BR_VLFLAG_GLOBAL_MCAST_ENABLED; |
| br_multicast_toggle_vlan(vlan, on); |
| |
| return true; |
| } |
| |
| void br_multicast_stop(struct net_bridge *br) |
| { |
| ASSERT_RTNL(); |
| |
| if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { |
| struct net_bridge_vlan_group *vg; |
| struct net_bridge_vlan *vlan; |
| |
| vg = br_vlan_group(br); |
| if (vg) { |
| list_for_each_entry(vlan, &vg->vlan_list, vlist) { |
| struct net_bridge_mcast *brmctx; |
| |
| brmctx = &vlan->br_mcast_ctx; |
| if (br_vlan_is_brentry(vlan) && |
| !br_multicast_ctx_vlan_disabled(brmctx)) |
| __br_multicast_stop(&vlan->br_mcast_ctx); |
| } |
| } |
| } else { |
| __br_multicast_stop(&br->multicast_ctx); |
| } |
| } |
| |
| 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_ctx_deinit(&br->multicast_ctx); |
| br_multicast_gc(&deleted_head); |
| cancel_work_sync(&br->mcast_gc_work); |
| |
| rcu_barrier(); |
| } |
| |
| int br_multicast_set_router(struct net_bridge_mcast *brmctx, unsigned long val) |
| { |
| int err = -EINVAL; |
| |
| spin_lock_bh(&brmctx->br->multicast_lock); |
| |
| switch (val) { |
| case MDB_RTR_TYPE_DISABLED: |
| case MDB_RTR_TYPE_PERM: |
| br_mc_router_state_change(brmctx->br, val == MDB_RTR_TYPE_PERM); |
| del_timer(&brmctx->ip4_mc_router_timer); |
| #if IS_ENABLED(CONFIG_IPV6) |
| del_timer(&brmctx->ip6_mc_router_timer); |
| #endif |
| brmctx->multicast_router = val; |
| err = 0; |
| break; |
| case MDB_RTR_TYPE_TEMP_QUERY: |
| if (brmctx->multicast_router != MDB_RTR_TYPE_TEMP_QUERY) |
| br_mc_router_state_change(brmctx->br, false); |
| brmctx->multicast_router = val; |
| err = 0; |
| break; |
| } |
| |
| spin_unlock_bh(&brmctx->br->multicast_lock); |
| |
| return err; |
| } |
| |
| static void |
| br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted) |
| { |
| if (!deleted) |
| return; |
| |
| /* For backwards compatibility for now, only notify if there is |
| * no multicast router anymore for both IPv4 and IPv6. |
| */ |
| if (!hlist_unhashed(&pmctx->ip4_rlist)) |
| return; |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (!hlist_unhashed(&pmctx->ip6_rlist)) |
| return; |
| #endif |
| |
| br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_DELMDB); |
| br_port_mc_router_state_change(pmctx->port, false); |
| |
| /* don't allow timer refresh */ |
| if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) |
| pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; |
| } |
| |
| int br_multicast_set_port_router(struct net_bridge_mcast_port *pmctx, |
| unsigned long val) |
| { |
| struct net_bridge_mcast *brmctx; |
| unsigned long now = jiffies; |
| int err = -EINVAL; |
| bool del = false; |
| |
| brmctx = br_multicast_port_ctx_get_global(pmctx); |
| spin_lock_bh(&brmctx->br->multicast_lock); |
| if (pmctx->multicast_router == val) { |
| /* Refresh the temp router port timer */ |
| if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) { |
| mod_timer(&pmctx->ip4_mc_router_timer, |
| now + brmctx->multicast_querier_interval); |
| #if IS_ENABLED(CONFIG_IPV6) |
| mod_timer(&pmctx->ip6_mc_router_timer, |
| now + brmctx->multicast_querier_interval); |
| #endif |
| } |
| err = 0; |
| goto unlock; |
| } |
| switch (val) { |
| case MDB_RTR_TYPE_DISABLED: |
| pmctx->multicast_router = MDB_RTR_TYPE_DISABLED; |
| del |= br_ip4_multicast_rport_del(pmctx); |
| del_timer(&pmctx->ip4_mc_router_timer); |
| del |= br_ip6_multicast_rport_del(pmctx); |
| #if IS_ENABLED(CONFIG_IPV6) |
| del_timer(&pmctx->ip6_mc_router_timer); |
| #endif |
| br_multicast_rport_del_notify(pmctx, del); |
| break; |
| case MDB_RTR_TYPE_TEMP_QUERY: |
| pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; |
| del |= br_ip4_multicast_rport_del(pmctx); |
| del |= br_ip6_multicast_rport_del(pmctx); |
| br_multicast_rport_del_notify(pmctx, del); |
| break; |
| case MDB_RTR_TYPE_PERM: |
| pmctx->multicast_router = MDB_RTR_TYPE_PERM; |
| del_timer(&pmctx->ip4_mc_router_timer); |
| br_ip4_multicast_add_router(brmctx, pmctx); |
| #if IS_ENABLED(CONFIG_IPV6) |
| del_timer(&pmctx->ip6_mc_router_timer); |
| #endif |
| br_ip6_multicast_add_router(brmctx, pmctx); |
| break; |
| case MDB_RTR_TYPE_TEMP: |
| pmctx->multicast_router = MDB_RTR_TYPE_TEMP; |
| br_ip4_multicast_mark_router(brmctx, pmctx); |
| br_ip6_multicast_mark_router(brmctx, pmctx); |
| break; |
| default: |
| goto unlock; |
| } |
| err = 0; |
| unlock: |
| spin_unlock_bh(&brmctx->br->multicast_lock); |
| |
| return err; |
| } |
| |
| int br_multicast_set_vlan_router(struct net_bridge_vlan *v, u8 mcast_router) |
| { |
| int err; |
| |
| if (br_vlan_is_master(v)) |
| err = br_multicast_set_router(&v->br_mcast_ctx, mcast_router); |
| else |
| err = br_multicast_set_port_router(&v->port_mcast_ctx, |
| mcast_router); |
| |
| return err; |
| } |
| |
| static void br_multicast_start_querier(struct net_bridge_mcast *brmctx, |
| struct bridge_mcast_own_query *query) |
| { |
| struct net_bridge_port *port; |
| |
| if (!br_multicast_ctx_matches_vlan_snooping(brmctx)) |
| return; |
| |
| __br_multicast_open_query(brmctx->br, query); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(port, &brmctx->br->port_list, list) { |
| struct bridge_mcast_own_query *ip4_own_query; |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct bridge_mcast_own_query *ip6_own_query; |
| #endif |
| |
| if (br_multicast_port_ctx_state_stopped(&port->multicast_ctx)) |
| continue; |
| |
| if (br_multicast_ctx_is_vlan(brmctx)) { |
| struct net_bridge_vlan *vlan; |
| |
| vlan = br_vlan_find(nbp_vlan_group_rcu(port), |
| brmctx->vlan->vid); |
| if (!vlan || |
| br_multicast_port_ctx_state_stopped(&vlan->port_mcast_ctx)) |
| continue; |
| |
| ip4_own_query = &vlan->port_mcast_ctx.ip4_own_query; |
| #if IS_ENABLED(CONFIG_IPV6) |
| ip6_own_query = &vlan->port_mcast_ctx.ip6_own_query; |
| #endif |
| } else { |
| ip4_own_query = &port->multicast_ctx.ip4_own_query; |
| #if IS_ENABLED(CONFIG_IPV6) |
| ip6_own_query = &port->multicast_ctx.ip6_own_query; |
| #endif |
| } |
| |
| if (query == &brmctx->ip4_own_query) |
| br_multicast_enable(ip4_own_query); |
| #if IS_ENABLED(CONFIG_IPV6) |
| else |
| br_multicast_enable(ip6_own_query); |
| #endif |
| } |
| rcu_read_unlock(); |
| } |
| |
| int br_multicast_toggle(struct net_bridge *br, unsigned long val, |
| struct netlink_ext_ack *extack) |
| { |
| struct net_bridge_port *port; |
| bool change_snoopers = false; |
| int err = 0; |
| |
| spin_lock_bh(&br->multicast_lock); |
| if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val) |
| goto unlock; |
| |
| err = br_mc_disabled_update(br->dev, val, extack); |
| if (err == -EOPNOTSUPP) |
| err = 0; |
| if (err) |
| goto unlock; |
| |
| 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_ctx(&port->multicast_ctx); |
| |
| 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 err; |
| } |
| |
| 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->multicast_ctx, NULL); |
| spin_unlock_bh(&br->multicast_lock); |
| return is_router; |
| } |
| EXPORT_SYMBOL_GPL(br_multicast_router); |
| |
| int br_multicast_set_querier(struct net_bridge_mcast *brmctx, unsigned long val) |
| { |
| unsigned long max_delay; |
| |
| val = !!val; |
| |
| spin_lock_bh(&brmctx->br->multicast_lock); |
| if (brmctx->multicast_querier == val) |
| goto unlock; |
| |
| WRITE_ONCE(brmctx->multicast_querier, val); |
| if (!val) |
| goto unlock; |
| |
| max_delay = brmctx->multicast_query_response_interval; |
| |
| if (!timer_pending(&brmctx->ip4_other_query.timer)) |
| brmctx->ip4_other_query.delay_time = jiffies + max_delay; |
| |
| br_multicast_start_querier(brmctx, &brmctx->ip4_own_query); |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (!timer_pending(&brmctx->ip6_other_query.timer)) |
| brmctx->ip6_other_query.delay_time = jiffies + max_delay; |
| |
| br_multicast_start_querier(brmctx, &brmctx->ip6_own_query); |
| #endif |
| |
| unlock: |
| spin_unlock_bh(&brmctx->br->multicast_lock); |
| |
| return 0; |
| } |
| |
| int br_multicast_set_igmp_version(struct net_bridge_mcast *brmctx, |
| unsigned long val) |
| { |
| /* Currently we support only version 2 and 3 */ |
| switch (val) { |
| case 2: |
| case 3: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| spin_lock_bh(&brmctx->br->multicast_lock); |
| brmctx->multicast_igmp_version = val; |
| spin_unlock_bh(&brmctx->br->multicast_lock); |
| |
| return 0; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| int br_multicast_set_mld_version(struct net_bridge_mcast *brmctx, |
| unsigned long val) |
| { |
| /* Currently we support version 1 and 2 */ |
| switch (val) { |
| case 1: |
| case 2: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| spin_lock_bh(&brmctx->br->multicast_lock); |
| brmctx->multicast_mld_version = val; |
| spin_unlock_bh(&brmctx->br->multicast_lock); |
| |
| return 0; |
| } |
| #endif |
| |
| void br_multicast_set_query_intvl(struct net_bridge_mcast *brmctx, |
| unsigned long val) |
| { |
| unsigned long intvl_jiffies = clock_t_to_jiffies(val); |
| |
| if (intvl_jiffies < BR_MULTICAST_QUERY_INTVL_MIN) { |
| br_info(brmctx->br, |
| "trying to set multicast query interval below minimum, setting to %lu (%ums)\n", |
| jiffies_to_clock_t(BR_MULTICAST_QUERY_INTVL_MIN), |
| jiffies_to_msecs(BR_MULTICAST_QUERY_INTVL_MIN)); |
| intvl_jiffies = BR_MULTICAST_QUERY_INTVL_MIN; |
| } |
| |
| brmctx->multicast_query_interval = intvl_jiffies; |
| } |
| |
| void br_multicast_set_startup_query_intvl(struct net_bridge_mcast *brmctx, |
| unsigned long val) |
| { |
| unsigned long intvl_jiffies = clock_t_to_jiffies(val); |
| |
| if (intvl_jiffies < BR_MULTICAST_STARTUP_QUERY_INTVL_MIN) { |
| br_info(brmctx->br, |
| "trying to set multicast startup query interval below minimum, setting to %lu (%ums)\n", |
| jiffies_to_clock_t(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN), |
| jiffies_to_msecs(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN)); |
| intvl_jiffies = BR_MULTICAST_STARTUP_QUERY_INTVL_MIN; |
| } |
| |
| brmctx->multicast_startup_query_interval = intvl_jiffies; |
| } |
| |
| /** |
| * 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->multicast_ctx, ð, NULL); |
| |
| 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_mcast *brmctx; |
| struct net_bridge *br; |
| struct net_bridge_port *port; |
| bool ret = false; |
| int port_ifidx; |
| |
| 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; |
| brmctx = &br->multicast_ctx; |
| |
| switch (proto) { |
| case ETH_P_IP: |
| port_ifidx = brmctx->ip4_querier.port_ifidx; |
| if (!timer_pending(&brmctx->ip4_other_query.timer) || |
| port_ifidx == port->dev->ifindex) |
| goto unlock; |
| break; |
| #if IS_ENABLED(CONFIG_IPV6) |
| case ETH_P_IPV6: |
| port_ifidx = brmctx->ip6_querier.port_ifidx; |
| if (!timer_pending(&brmctx->ip6_other_query.timer) || |
| port_ifidx == port->dev->ifindex) |
| goto unlock; |
| break; |
| #endif |
| default: |
| goto unlock; |
| } |
| |
| ret = true; |
| unlock: |
| rcu_read_unlock(); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); |
| |
| /** |
| * br_multicast_has_router_adjacent - Checks for a router behind a bridge port |
| * @dev: The bridge port adjacent to which to check for a multicast router |
| * @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 multicast router is behind one of the other ports of this |
| * bridge. Otherwise returns false. |
| */ |
| bool br_multicast_has_router_adjacent(struct net_device *dev, int proto) |
| { |
| struct net_bridge_mcast_port *pmctx; |
| struct net_bridge_mcast *brmctx; |
| struct net_bridge_port *port; |
| bool ret = false; |
| |
| rcu_read_lock(); |
| port = br_port_get_check_rcu(dev); |
| if (!port) |
| goto unlock; |
| |
| brmctx = &port->br->multicast_ctx; |
| switch (proto) { |
| case ETH_P_IP: |
| hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list, |
| ip4_rlist) { |
| if (pmctx->port == port) |
| continue; |
| |
| ret = true; |
| goto unlock; |
| } |
| break; |
| #if IS_ENABLED(CONFIG_IPV6) |
| case ETH_P_IPV6: |
| hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list, |
| ip6_rlist) { |
| if (pmctx->port == port) |
| continue; |
| |
| ret = true; |
| goto unlock; |
| } |
| break; |
| #endif |
| default: |
| /* when compiled without IPv6 support, be conservative and |
| * always assume presence of an IPv6 multicast router |
| */ |
| ret = true; |
| } |
| |
| unlock: |
| rcu_read_unlock(); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(br_multicast_has_router_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(&cpu_stats->syncp); |
| memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); |
| } while (u64_stats_fetch_retry(&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); |
| } |
