From 9116ffbf1dd71f953ffda4198d01f82d3ca16df8 Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Tue, 22 Sep 2020 10:30:25 +0300 Subject: [PATCH] net: bridge: mcast: add support for blocked port groups When excluding S,G entries we need a way to block a particular S,G,port. The new port group flag is managed based on the source's timer as per RFCs 3376 and 3810. When a source expires and its port group is in EXCLUDE mode, it will be blocked. Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- include/uapi/linux/if_bridge.h | 1 + net/bridge/br_mdb.c | 2 ++ net/bridge/br_multicast.c | 49 ++++++++++++++++++++++++++++++++++++------ net/bridge/br_private.h | 1 + 4 files changed, 47 insertions(+), 6 deletions(-) diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h index e4bd30a..4c68768 100644 --- a/include/uapi/linux/if_bridge.h +++ b/include/uapi/linux/if_bridge.h @@ -519,6 +519,7 @@ struct br_mdb_entry { #define MDB_FLAGS_OFFLOAD (1 << 0) #define MDB_FLAGS_FAST_LEAVE (1 << 1) #define MDB_FLAGS_STAR_EXCL (1 << 2) +#define MDB_FLAGS_BLOCKED (1 << 3) __u8 flags; __u16 vid; struct { diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c index 28cd35a..e15bab1 100644 --- a/net/bridge/br_mdb.c +++ b/net/bridge/br_mdb.c @@ -64,6 +64,8 @@ static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags) e->flags |= MDB_FLAGS_FAST_LEAVE; if (flags & MDB_PG_FLAGS_STAR_EXCL) e->flags |= MDB_FLAGS_STAR_EXCL; + if (flags & MDB_PG_FLAGS_BLOCKED) + e->flags |= MDB_FLAGS_BLOCKED; } static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip, diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index f39bbd7..11d224c 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -72,7 +72,8 @@ __br_multicast_add_group(struct net_bridge *br, struct br_ip *group, const unsigned char *src, u8 filter_mode, - bool igmpv2_mldv1); + bool igmpv2_mldv1, + bool blocked); static void br_multicast_find_del_pg(struct net_bridge *br, struct net_bridge_port_group *pg); @@ -211,7 +212,7 @@ static void __fwd_add_star_excl(struct net_bridge_port_group *pg, return; src_pg = __br_multicast_add_group(br, pg->key.port, sg_ip, pg->eth_addr, - MCAST_INCLUDE, false); + MCAST_INCLUDE, false, false); if (IS_ERR_OR_NULL(src_pg) || src_pg->rt_protocol != RTPROT_KERNEL) return; @@ -343,7 +344,7 @@ void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp, src_pg = __br_multicast_add_group(br, pg->key.port, &sg->key.addr, sg->eth_addr, - MCAST_INCLUDE, false); + MCAST_INCLUDE, false, false); if (IS_ERR_OR_NULL(src_pg) || src_pg->rt_protocol != RTPROT_KERNEL) continue; @@ -364,7 +365,8 @@ static void br_multicast_fwd_src_add(struct net_bridge_group_src *src) sg_ip = src->pg->key.addr; sg_ip.src = src->addr.src; sg = __br_multicast_add_group(src->br, src->pg->key.port, &sg_ip, - src->pg->eth_addr, MCAST_INCLUDE, false); + src->pg->eth_addr, MCAST_INCLUDE, false, + !timer_pending(&src->timer)); if (IS_ERR_OR_NULL(sg)) return; src->flags |= BR_SGRP_F_INSTALLED; @@ -415,9 +417,38 @@ static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src) 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) @@ -995,7 +1026,10 @@ static void br_multicast_group_src_expired(struct timer_list *t) 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); } @@ -1131,7 +1165,8 @@ __br_multicast_add_group(struct net_bridge *br, struct br_ip *group, const unsigned char *src, u8 filter_mode, - bool igmpv2_mldv1) + bool igmpv2_mldv1, + bool blocked) { struct net_bridge_port_group __rcu **pp; struct net_bridge_port_group *p = NULL; @@ -1167,6 +1202,8 @@ __br_multicast_add_group(struct net_bridge *br, goto out; } rcu_assign_pointer(*pp, p); + if (blocked) + p->flags |= MDB_PG_FLAGS_BLOCKED; br_mdb_notify(br->dev, mp, p, RTM_NEWMDB); found: @@ -1189,7 +1226,7 @@ static int br_multicast_add_group(struct net_bridge *br, spin_lock(&br->multicast_lock); pg = __br_multicast_add_group(br, port, group, src, filter_mode, - igmpv2_mldv1); + igmpv2_mldv1, false); /* NULL is considered valid for host joined groups */ err = IS_ERR(pg) ? PTR_ERR(pg) : 0; spin_unlock(&br->multicast_lock); diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 128d2d0..345118e 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -214,6 +214,7 @@ struct net_bridge_fdb_entry { #define MDB_PG_FLAGS_OFFLOAD BIT(1) #define MDB_PG_FLAGS_FAST_LEAVE BIT(2) #define MDB_PG_FLAGS_STAR_EXCL BIT(3) +#define MDB_PG_FLAGS_BLOCKED BIT(4) #define PG_SRC_ENT_LIMIT 32 -- 2.7.4