From 0909e11758bd28848aeb6646e021ec1e031a3f0f Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sat, 27 Feb 2010 19:41:49 +0000 Subject: bridge: Add multicast_router sysfs entries This patch allows the user to forcibly enable/disable ports as having multicast routers attached. A port with a multicast router will receive all multicast traffic. The value 0 disables it completely. The default is 1 which lets the system automatically detect the presence of routers (currently this is limited to picking up queries), and 2 means that the port will always receive all multicast traffic. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/bridge/br_multicast.c | 105 +++++++++++++++++++++++++++++++++++++++------- 1 file changed, 91 insertions(+), 14 deletions(-) (limited to 'net/bridge/br_multicast.c') diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index 746b5a611aae..674224b6729d 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -746,12 +746,30 @@ static int br_multicast_igmp3_report(struct net_bridge *br, return err; } +static void br_multicast_add_router(struct net_bridge *br, + struct net_bridge_port *port) +{ + struct hlist_node *p; + struct hlist_node **h; + + for (h = &br->router_list.first; + (p = *h) && + (unsigned long)container_of(p, struct net_bridge_port, rlist) > + (unsigned long)port; + h = &p->next) + ; + + port->rlist.pprev = h; + port->rlist.next = p; + rcu_assign_pointer(*h, &port->rlist); + if (p) + p->pprev = &port->rlist.next; +} + static void br_multicast_mark_router(struct net_bridge *br, struct net_bridge_port *port) { unsigned long now = jiffies; - struct hlist_node *p; - struct hlist_node **h; if (!port) { if (br->multicast_router == 1) @@ -766,18 +784,7 @@ static void br_multicast_mark_router(struct net_bridge *br, if (!hlist_unhashed(&port->rlist)) goto timer; - for (h = &br->router_list.first; - (p = *h) && - (unsigned long)container_of(p, struct net_bridge_port, rlist) > - (unsigned long)port; - h = &p->next) - ; - - port->rlist.pprev = h; - port->rlist.next = p; - rcu_assign_pointer(*h, &port->rlist); - if (p) - p->pprev = &port->rlist.next; + br_multicast_add_router(br, port); timer: mod_timer(&port->multicast_router_timer, @@ -1133,3 +1140,73 @@ void br_multicast_stop(struct net_bridge *br) out: spin_unlock_bh(&br->multicast_lock); } + +int br_multicast_set_router(struct net_bridge *br, unsigned long val) +{ + int err = -ENOENT; + + spin_lock_bh(&br->multicast_lock); + if (!netif_running(br->dev)) + goto unlock; + + switch (val) { + case 0: + case 2: + del_timer(&br->multicast_router_timer); + /* fall through */ + case 1: + br->multicast_router = val; + err = 0; + break; + + default: + err = -EINVAL; + break; + } + +unlock: + spin_unlock_bh(&br->multicast_lock); + + return err; +} + +int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) +{ + struct net_bridge *br = p->br; + int err = -ENOENT; + + spin_lock(&br->multicast_lock); + if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) + goto unlock; + + switch (val) { + case 0: + case 1: + case 2: + p->multicast_router = val; + err = 0; + + if (val < 2 && !hlist_unhashed(&p->rlist)) + hlist_del_init_rcu(&p->rlist); + + if (val == 1) + break; + + del_timer(&p->multicast_router_timer); + + if (val == 0) + break; + + br_multicast_add_router(br, p); + break; + + default: + err = -EINVAL; + break; + } + +unlock: + spin_unlock(&br->multicast_lock); + + return err; +} -- cgit v1.2.3