add Bridge.Interface()

router/bridge.go

@@ -1,5 +1,9 @@
 package router
 
+import (
+	"net"
+)
+
 // Interface to packet handling on the local virtual bridge
 type Bridge interface {
 	// Inject a packet to be delivered locally
@@ -9,6 +13,7 @@ type Bridge interface {
 	// should not be included.
 	StartConsumingPackets(BridgeConsumer) error
 
+	Interface() *net.Interface
 	String() string
 	Stats() map[string]int
 }
@@ -26,6 +31,10 @@ func (NullBridge) StartConsumingPackets(BridgeConsumer) error {
 	return nil
 }
 
+func (NullBridge) Interface() *net.Interface {
+	return nil
+}
+
 func (NullBridge) String() string {
 	return "<no bridge networking>"
 }

router/fastdp.go

@@ -204,6 +204,10 @@ func (fastdp *FastDatapath) Bridge() Bridge {
 	return fastDatapathBridge{fastdp}
 }
 
+func (fastdp fastDatapathBridge) Interface() *net.Interface {
+	return fastdp.iface
+}
+
 func (fastdp fastDatapathBridge) String() string {
 	return fmt.Sprint(fastdp.dpname, " (via ODP)")
 }

router/pcap.go

@@ -104,6 +104,10 @@ func newPcapHandle(ifName string, promisc bool, snaplen int, bufSz int) (handle
 	return
 }
 
+func (p *Pcap) Interface() *net.Interface {
+	return p.iface
+}
+
 func (p *Pcap) String() string {
 	return fmt.Sprint(p.iface.Name, " (via pcap)")
 }