Merge into master from pull request #67:

Add a method to TopologyService (https://github.com/floodlight/floodlight/pull/67)

src/main/java/net/floodlightcontroller/topology/ITopologyService.java

@@ -43,6 +43,15 @@ public interface ITopologyService extends IFloodlightService  {
 
     public boolean isAllowed(long sw, short portId);
 
+    /**
+     * If the dst is not allowed by the higher-level topology, this method provides
+     * the topologically equivalent broadcast port.  
+     * @param src
+     * @param dst
+     * @return the allowed broadcast port
+     */
+    public NodePortTuple getAllowedOutgoingBroadcastPort(NodePortTuple src, NodePortTuple dst);
+    
     public boolean isIncomingBroadcastAllowed(long sw, short portId);
 
     public boolean isInSameBroadcastDomain(long s1, short p1, long s2, short p2);

src/main/java/net/floodlightcontroller/topology/TopologyManager.java

@@ -370,6 +370,11 @@ IRoutingService, ILinkDiscoveryListener {
         return currentInstance.isAllowed(sw, portId);
     }
 
+    @Override
+    public NodePortTuple getAllowedOutgoingBroadcastPort(NodePortTuple src, NodePortTuple dst) {
+    	return null;
+    }
+    
     @Override
     public boolean isIncomingBroadcastAllowed(long sw, short portId) {
         return currentInstance.isIncomingBroadcastAllowedOnSwitchPort(sw, portId);