netdev - [PATCH net-next v2 08/14] bridge: mcast: Avoid arming group timer when (S, G) corresponds to a source

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Date:   Sat, 10 Dec 2022 16:56:27 +0200
From:   Ido Schimmel <idosch@...dia.com>
To:     netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, roopa@...dia.com, razor@...ckwall.org,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next v2 08/14] bridge: mcast: Avoid arming group timer when (S, G) corresponds to a source

User space will soon be able to install a (*, G) with a source list,
prompting the creation of a (S, G) entry for each source.

In this case, the group timer of the (S, G) entry should never be set.

Solve this by adding a new field to the MDB configuration structure that
denotes whether the (S, G) corresponds to a source or not.

The field will be set in a subsequent patch where br_mdb_add_group_sg()
is called in order to create a (S, G) entry for each user provided
source.

Signed-off-by: Ido Schimmel <idosch@...dia.com>
Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>
---
 net/bridge/br_mdb.c     | 2 +-
 net/bridge/br_private.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 95780652cdbf..7cda9d1c5c93 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -814,7 +814,7 @@ static int br_mdb_add_group_sg(const struct br_mdb_config *cfg,
 		return -ENOMEM;
 	}
 	rcu_assign_pointer(*pp, p);
-	if (!(flags & MDB_PG_FLAGS_PERMANENT))
+	if (!(flags & MDB_PG_FLAGS_PERMANENT) && !cfg->src_entry)
 		mod_timer(&p->timer,
 			  now + brmctx->multicast_membership_interval);
 	br_mdb_notify(cfg->br->dev, mp, p, RTM_NEWMDB);
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 74f17b56c9eb..e98bfe3c02e1 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -98,6 +98,7 @@ struct br_mdb_config {
 	struct net_bridge_port		*p;
 	struct br_mdb_entry		*entry;
 	struct br_ip			group;
+	bool				src_entry;
 };
 #endif
 
-- 
2.37.3