Add ip route append

Signed-off-by: yaocw2020 <yaocanwu@gmail.com>

handle_unspecified.go

@@ -237,6 +237,10 @@ func (h *Handle) RouteAdd(route *Route) error {
 	return ErrNotImplemented
 }
 
+func (h *Handle) RouteAppend(route *Route) error {
+	return ErrNotImplemented
+}
+
 func (h *Handle) RouteDel(route *Route) error {
 	return ErrNotImplemented
 }

route_linux.go

@@ -518,6 +518,20 @@ func (h *Handle) RouteAdd(route *Route) error {
 	return h.routeHandle(route, req, nl.NewRtMsg())
 }
 
+// RouteAppend will append a route to the system.
+// Equivalent to: `ip route append $route`
+func RouteAppend(route *Route) error {
+	return pkgHandle.RouteAppend(route)
+}
+
+// RouteAppend will append a route to the system.
+// Equivalent to: `ip route append $route`
+func (h *Handle) RouteAppend(route *Route) error {
+	flags := unix.NLM_F_CREATE | unix.NLM_F_APPEND | unix.NLM_F_ACK
+	req := h.newNetlinkRequest(unix.RTM_NEWROUTE, flags)
+	return h.routeHandle(route, req, nl.NewRtMsg())
+}
+
 // RouteReplace will add a route to the system.
 // Equivalent to: `ip route replace $route`
 func RouteReplace(route *Route) error {

route_test.go

@@ -206,6 +206,70 @@ func TestRouteReplace(t *testing.T) {
 
 }
 
+func TestRouteAppend(t *testing.T) {
+	tearDown := setUpNetlinkTest(t)
+	defer tearDown()
+
+	// get loopback interface
+	link, err := LinkByName("lo")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// bring the interface up
+	if err := LinkSetUp(link); err != nil {
+		t.Fatal(err)
+	}
+
+	// add a gateway route
+	dst := &net.IPNet{
+		IP:   net.IPv4(192, 168, 0, 0),
+		Mask: net.CIDRMask(24, 32),
+	}
+
+	ip := net.IPv4(127, 1, 1, 1)
+	route := Route{LinkIndex: link.Attrs().Index, Dst: dst, Src: ip}
+	if err := RouteAdd(&route); err != nil {
+		t.Fatal(err)
+	}
+	routes, err := RouteList(link, FAMILY_V4)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(routes) != 1 {
+		t.Fatal("Route not added properly")
+	}
+
+	ip = net.IPv4(127, 1, 1, 2)
+	route = Route{LinkIndex: link.Attrs().Index, Dst: dst, Src: ip}
+	if err := RouteAppend(&route); err != nil {
+		t.Fatal(err)
+	}
+
+	routes, err = RouteList(link, FAMILY_V4)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(routes) != 2 || !routes[1].Src.Equal(ip) {
+		t.Fatal("Route not append properly")
+	}
+
+	if err := RouteDel(&routes[0]); err != nil {
+		t.Fatal(err)
+	}
+	if err := RouteDel(&routes[1]); err != nil {
+		t.Fatal(err)
+	}
+	routes, err = RouteList(link, FAMILY_V4)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(routes) != 0 {
+		t.Fatal("Route not removed properly")
+	}
+}
+
 func TestRouteAddIncomplete(t *testing.T) {
 	tearDown := setUpNetlinkTest(t)
 	defer tearDown()