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net: bridge: mcast: add support for blocked port groups

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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 <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2020-09-22 10:30:25 +03:00 committed by David S. Miller
parent 8266a0491e
commit 9116ffbf1d
4 changed files with 47 additions and 6 deletions
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1
include/uapi/linux/if_bridge.h
View File

@ -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 {

2
net/bridge/br_mdb.c
View File

@ -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,

49
net/bridge/br_multicast.c
View File

@ -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);

1
net/bridge/br_private.h
View File

@ -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