[BRIDGE]: flush forwarding table when device carrier off

Flush the forwarding table when carrier is lost. This helps for
availability because we don't want to forward to a downed device and
new packets may come in on other links.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_fdb.c

@@ -128,7 +128,10 @@ void br_fdb_cleanup(unsigned long _data)
 	mod_timer(&br->gc_timer, jiffies + HZ/10);
 }
 
-void br_fdb_delete_by_port(struct net_bridge *br, struct net_bridge_port *p)
+
+void br_fdb_delete_by_port(struct net_bridge *br,
+			   const struct net_bridge_port *p,
+			   int do_all)
 {
 	int i;
 
@@ -142,6 +145,8 @@ void br_fdb_delete_by_port(struct net_bridge *br, struct net_bridge_port *p)
 			if (f->dst != p) 
 				continue;
 
+			if (f->is_static && !do_all)
+				continue;
 			/*
 			 * if multiple ports all have the same device address
 			 * then when one port is deleted, assign

net/bridge/br_if.c

@@ -163,7 +163,7 @@ static void del_nbp(struct net_bridge_port *p)
 	br_stp_disable_port(p);
 	spin_unlock_bh(&br->lock);
 
-	br_fdb_delete_by_port(br, p);
+	br_fdb_delete_by_port(br, p, 1);
 
 	list_del_rcu(&p->list);
 
@@ -448,7 +448,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 
 	return 0;
 err2:
-	br_fdb_delete_by_port(br, p);
+	br_fdb_delete_by_port(br, p, 1);
 err1:
 	kobject_del(&p->kobj);
 err0:

net/bridge/br_private.h

@@ -143,7 +143,7 @@ extern void br_fdb_changeaddr(struct net_bridge_port *p,
 			      const unsigned char *newaddr);
 extern void br_fdb_cleanup(unsigned long arg);
 extern void br_fdb_delete_by_port(struct net_bridge *br,
-			   struct net_bridge_port *p);
+				  const struct net_bridge_port *p, int do_all);
 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 						 const unsigned char *addr);
 extern struct net_bridge_fdb_entry *br_fdb_get(struct net_bridge *br,

net/bridge/br_stp_if.c

@@ -113,6 +113,8 @@ void br_stp_disable_port(struct net_bridge_port *p)
 	del_timer(&p->forward_delay_timer);
 	del_timer(&p->hold_timer);
 
+	br_fdb_delete_by_port(br, p, 0);
+
 	br_configuration_update(br);
 
 	br_port_state_selection(br);