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bridge: Add multicast_snooping sysfs toggle 

This patch allows the user to disable IGMP snooping completely
through a sysfs toggle.  It also allows the user to reenable
snooping when it has been automatically disabled due to hash
collisions.  If the collisions have not been resolved however
the system will refuse to reenable snooping.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2010-02-27 19:41:50 +00:00 committed by David S. Miller
parent 0909e11758
commit 561f1103a2
3 changed files with 75 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
net/bridge/br_multicast.c
View File

@ -656,6 +656,15 @@ void br_multicast_del_port(struct net_bridge_port *port)
del_timer_sync(&port->multicast_router_timer);
}
static void __br_multicast_enable_port(struct net_bridge_port *port)
{
port->multicast_startup_queries_sent = 0;
if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
del_timer(&port->multicast_query_timer))
mod_timer(&port->multicast_query_timer, jiffies);
}
void br_multicast_enable_port(struct net_bridge_port *port)
{
struct net_bridge *br = port->br;
@ -664,11 +673,7 @@ void br_multicast_enable_port(struct net_bridge_port *port)
if (br->multicast_disabled || !netif_running(br->dev))
goto out;
port->multicast_startup_queries_sent = 0;
if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
del_timer(&port->multicast_query_timer))
mod_timer(&port->multicast_query_timer, jiffies);
__br_multicast_enable_port(port);
out:
spin_unlock(&br->multicast_lock);
@ -1210,3 +1215,49 @@ unlock:
return err;
}
int br_multicast_toggle(struct net_bridge *br, unsigned long val)
{
struct net_bridge_port *port;
int err = -ENOENT;
spin_lock(&br->multicast_lock);
if (!netif_running(br->dev))
goto unlock;
err = 0;
if (br->multicast_disabled == !val)
goto unlock;
br->multicast_disabled = !val;
if (br->multicast_disabled)
goto unlock;
if (br->mdb) {
if (br->mdb->old) {
err = -EEXIST;
rollback:
br->multicast_disabled = !!val;
goto unlock;
}
err = br_mdb_rehash(&br->mdb, br->mdb->max,
br->hash_elasticity);
if (err)
goto rollback;
}
br_multicast_open(br);
list_for_each_entry(port, &br->port_list, list) {
if (port->state == BR_STATE_DISABLED ||
port->state == BR_STATE_BLOCKING)
continue;
__br_multicast_enable_port(port);
}
unlock:
spin_unlock(&br->multicast_lock);
return err;
}

1
net/bridge/br_private.h
View File

@ -300,6 +300,7 @@ extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
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);
#else
static inline int br_multicast_rcv(struct net_bridge *br,
struct net_bridge_port *port,

18
net/bridge/br_sysfs_br.c
View File

@ -361,6 +361,23 @@ static ssize_t store_multicast_router(struct device *d,
}
static DEVICE_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
store_multicast_router);
static ssize_t show_multicast_snooping(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct net_bridge *br = to_bridge(d);
return sprintf(buf, "%d\n", !br->multicast_disabled);
}
static ssize_t store_multicast_snooping(struct device *d,
struct device_attribute *attr,
const char *buf, size_t len)
{
return store_bridge_parm(d, buf, len, br_multicast_toggle);
}
static DEVICE_ATTR(multicast_snooping, S_IRUGO | S_IWUSR,
show_multicast_snooping, store_multicast_snooping);
#endif
static struct attribute *bridge_attrs[] = {
@ -384,6 +401,7 @@ static struct attribute *bridge_attrs[] = {
&dev_attr_flush.attr,
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
&dev_attr_multicast_router.attr,
&dev_attr_multicast_snooping.attr,
#endif
NULL
};