Fix for Pod Connecting to itself via ServiceIP (#248)

* Enable hairpin for veth interface connecting to container interface. This fixes pod connecting to itself via service IP

Author: tamilmani1989

network/bridge_endpointclient_linux.go

@@ -74,6 +74,12 @@ func (client *LinuxBridgeEndpointClient) AddEndpointRules(epInfo *EndpointInfo)
 		}
 	}
 
+	log.Printf("[net] Setting hairpin for hostveth %v", client.hostVethName)
+	if err := netlink.SetLinkHairpin(client.hostVethName, true); err != nil {
+		log.Printf("Setting up hairpin failed for interface %v error %v", client.hostVethName, err)
+		return err
+	}
+
 	return nil
 }
 
@@ -127,6 +133,7 @@ func (client *LinuxBridgeEndpointClient) SetupContainerInterfaces(epInfo *Endpoi
 	}
 
 	client.containerVethName = epInfo.IfName
+
 	return nil
 }
 

network/endpoint_linux.go

@@ -220,7 +220,7 @@ func addRoutes(interfaceName string, routes []RouteInfo) error {
 	interfaceIf, _ := net.InterfaceByName(interfaceName)
 
 	for _, route := range routes {
-		log.Printf("[ovs] Adding IP route %+v to link %v.", route, interfaceName)
+		log.Printf("[net] Adding IP route %+v to link %v.", route, interfaceName)
 
 		if route.DevName != "" {
 			devIf, _ := net.InterfaceByName(route.DevName)