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bridge: only expire the mdb entry when query is received

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Currently we arm the expire timer when the mdb entry is added,
however, this causes problem when there is no querier sent
out after that.

So we should only arm the timer when a corresponding query is
received, as suggested by Herbert.

And he also mentioned "if there is no querier then group
subscriptions shouldn't expire. There has to be at least one querier
in the network for this thing to work.  Otherwise it just degenerates
into a non-snooping switch, which is OK."

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Adam Baker <linux@baker-net.org.uk>
Signed-off-by: Cong Wang <amwang@redhat.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2013-05-21 21:52:55 +00:00 committed by David S. Miller
parent 1c8ad5bfa2
commit 9f00b2e7cf
2 changed files with 13 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
net/bridge/br_multicast.c
View File

@ -617,8 +617,6 @@ rehash:
mp->br = br;
mp->addr = *group;
setup_timer(&mp->timer, br_multicast_group_expired,
(unsigned long)mp);
hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
mdb->size++;
@ -656,7 +654,6 @@ static int br_multicast_add_group(struct net_bridge *br,
struct net_bridge_mdb_entry *mp;
struct net_bridge_port_group *p;
struct net_bridge_port_group __rcu **pp;
unsigned long now = jiffies;
int err;
spin_lock(&br->multicast_lock);
@ -671,7 +668,6 @@ static int br_multicast_add_group(struct net_bridge *br,
if (!port) {
mp->mglist = true;
mod_timer(&mp->timer, now + br->multicast_membership_interval);
goto out;
}
@ -679,7 +675,7 @@ static int br_multicast_add_group(struct net_bridge *br,
(p = mlock_dereference(*pp, br)) != NULL;
pp = &p->next) {
if (p->port == port)
goto found;
goto out;
if ((unsigned long)p->port < (unsigned long)port)
break;
}
@ -690,8 +686,6 @@ static int br_multicast_add_group(struct net_bridge *br,
rcu_assign_pointer(*pp, p);
br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
found:
mod_timer(&p->timer, now + br->multicast_membership_interval);
out:
err = 0;
@ -1131,6 +1125,10 @@ static int br_ip4_multicast_query(struct net_bridge *br,
if (!mp)
goto out;
setup_timer(&mp->timer, br_multicast_group_expired, (unsigned long)mp);
mod_timer(&mp->timer, now + br->multicast_membership_interval);
mp->timer_armed = true;
max_delay *= br->multicast_last_member_count;
if (mp->mglist &&
@ -1205,6 +1203,10 @@ static int br_ip6_multicast_query(struct net_bridge *br,
if (!mp)
goto out;
setup_timer(&mp->timer, br_multicast_group_expired, (unsigned long)mp);
mod_timer(&mp->timer, now + br->multicast_membership_interval);
mp->timer_armed = true;
max_delay *= br->multicast_last_member_count;
if (mp->mglist &&
(timer_pending(&mp->timer) ?
@ -1263,7 +1265,7 @@ static void br_multicast_leave_group(struct net_bridge *br,
call_rcu_bh(&p->rcu, br_multicast_free_pg);
br_mdb_notify(br->dev, port, group, RTM_DELMDB);
if (!mp->ports && !mp->mglist &&
if (!mp->ports && !mp->mglist && mp->timer_armed &&
netif_running(br->dev))
mod_timer(&mp->timer, jiffies);
}
@ -1275,30 +1277,12 @@ static void br_multicast_leave_group(struct net_bridge *br,
br->multicast_last_member_interval;
if (!port) {
if (mp->mglist &&
if (mp->mglist && mp->timer_armed &&
(timer_pending(&mp->timer) ?
time_after(mp->timer.expires, time) :
try_to_del_timer_sync(&mp->timer) >= 0)) {
mod_timer(&mp->timer, time);
}
goto out;
}
for (p = mlock_dereference(mp->ports, br);
p != NULL;
p = mlock_dereference(p->next, br)) {
if (p->port != port)
continue;
if (!hlist_unhashed(&p->mglist) &&
(timer_pending(&p->timer) ?
time_after(p->timer.expires, time) :
try_to_del_timer_sync(&p->timer) >= 0)) {
mod_timer(&p->timer, time);
}
break;
}
out:
@ -1674,6 +1658,7 @@ void br_multicast_stop(struct net_bridge *br)
hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
hlist[ver]) {
del_timer(&mp->timer);
mp->timer_armed = false;
call_rcu_bh(&mp->rcu, br_multicast_free_group);
}
}

1
net/bridge/br_private.h
View File

@ -112,6 +112,7 @@ struct net_bridge_mdb_entry
struct timer_list timer;
struct br_ip addr;
bool mglist;
bool timer_armed;
};
struct net_bridge_mdb_htable