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authorHerbert Xu <herbert@gondor.apana.org.au>2012-04-13 02:37:42 +0000
committerDavid S. Miller <davem@davemloft.net>2012-04-15 12:51:35 -0400
commitc5c23260594c5701af66ef754916775ba6a46bbc (patch)
tree2e0f5ce991fd3d3ad77e61745c84a4ca32b8601d
parentc83b8fab06fc8c80d6440649f117bb7541df5fd0 (diff)
downloadlinux-c5c23260594c5701af66ef754916775ba6a46bbc.tar.bz2
bridge: Add multicast_querier toggle and disable queries by default
Sending general queries was implemented as an optimisation to speed up convergence on start-up. In order to prevent interference with multicast routers a zero source address has to be used. Unfortunately these packets appear to cause some multicast-aware switches to misbehave, e.g., by disrupting multicast packets to us. Since the multicast snooping feature still functions without sending our own queries, this patch will change the default to not send queries. For those that need queries in order to speed up convergence on start-up, a toggle is provided to restore the previous behaviour. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/bridge/br_multicast.c20
-rw-r--r--net/bridge/br_private.h2
-rw-r--r--net/bridge/br_sysfs_br.c18
3 files changed, 40 insertions, 0 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index b3647d090e1f..708e84f31888 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -783,6 +783,7 @@ static void br_multicast_send_query(struct net_bridge *br,
struct br_ip br_group;
if (!netif_running(br->dev) || br->multicast_disabled ||
+ !br->multicast_querier ||
timer_pending(&br->multicast_querier_timer))
return;
@@ -1565,6 +1566,7 @@ void br_multicast_init(struct net_bridge *br)
br->hash_max = 512;
br->multicast_router = 1;
+ br->multicast_querier = 0;
br->multicast_last_member_count = 2;
br->multicast_startup_query_count = 2;
@@ -1760,6 +1762,24 @@ unlock:
return err;
}
+int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
+{
+ val = !!val;
+
+ spin_lock_bh(&br->multicast_lock);
+ if (br->multicast_querier == val)
+ goto unlock;
+
+ br->multicast_querier = val;
+ if (val)
+ br_multicast_start_querier(br);
+
+unlock:
+ spin_unlock_bh(&br->multicast_lock);
+
+ return 0;
+}
+
int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
{
int err = -ENOENT;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index e1d882257877..f8ffd8c49054 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -224,6 +224,7 @@ struct net_bridge
unsigned char multicast_router;
u8 multicast_disabled:1;
+ u8 multicast_querier:1;
u32 hash_elasticity;
u32 hash_max;
@@ -417,6 +418,7 @@ extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
extern int br_multicast_set_port_router(struct net_bridge_port *p,
unsigned long val);
extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
+extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
static inline bool br_multicast_is_router(struct net_bridge *br)
diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
index 766fd7fb0295..c5c059333eab 100644
--- a/net/bridge/br_sysfs_br.c
+++ b/net/bridge/br_sysfs_br.c
@@ -379,6 +379,23 @@ static ssize_t store_multicast_snooping(struct device *d,
static DEVICE_ATTR(multicast_snooping, S_IRUGO | S_IWUSR,
show_multicast_snooping, store_multicast_snooping);
+static ssize_t show_multicast_querier(struct device *d,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct net_bridge *br = to_bridge(d);
+ return sprintf(buf, "%d\n", br->multicast_querier);
+}
+
+static ssize_t store_multicast_querier(struct device *d,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ return store_bridge_parm(d, buf, len, br_multicast_set_querier);
+}
+static DEVICE_ATTR(multicast_querier, S_IRUGO | S_IWUSR,
+ show_multicast_querier, store_multicast_querier);
+
static ssize_t show_hash_elasticity(struct device *d,
struct device_attribute *attr, char *buf)
{
@@ -702,6 +719,7 @@ static struct attribute *bridge_attrs[] = {
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
&dev_attr_multicast_router.attr,
&dev_attr_multicast_snooping.attr,
+ &dev_attr_multicast_querier.attr,
&dev_attr_hash_elasticity.attr,
&dev_attr_hash_max.attr,
&dev_attr_multicast_last_member_count.attr,