add unchanged gw

Author: paulyufan2

cni/network/invoker_cns.go

@@ -362,7 +362,7 @@ func getRoutes(cnsRoutes []cns.Route, skipDefaultRoutes bool) ([]network.RouteIn
 		}
 
 		gw := net.ParseIP(route.GatewayIPAddress)
-		if skipDefaultRoutes {
+		if gw == nil && skipDefaultRoutes {
 			return nil, errors.Wrap(errInvalidGatewayIP, route.GatewayIPAddress)
 		}
 

cns/middlewares/k8sSwiftV2_windows.go

@@ -71,9 +71,13 @@ func (k *K8sSWIFTv2Middleware) addDefaultRoute(podIPInfo *cns.PodIpInfo, gateway
 func (k *K8sSWIFTv2Middleware) addRoutes(cidrs []string) []cns.Route {
 	routes := make([]cns.Route, len(cidrs))
 	for i, cidr := range cidrs {
+		ip, _, err := net.ParseCIDR(cidr)
+		if err != nil {
+			return "", errors.Wrap(err, "failed to parse cidr")
+		}
 		routes[i] = cns.Route{
 			IPAddress:        cidr,
-			GatewayIPAddress: "", // gateway IP is not required for infraNIC routes
+			GatewayIPAddress: ip.String(),
 		}
 	}
 	return routes