feature: Add wireguard link type

Added type "Wireguard" which implements link type "wireguard".

See also https://www.wireguard.com/

Signed-off-by: Dmitrii Okunev <xaionaro@fb.com>

link.go

@@ -349,6 +349,19 @@ func (veth *Veth) Type() string {
 	return "veth"
 }
 
+// Wireguard represent links of type "wireguard", see https://www.wireguard.com/
+type Wireguard struct {
+	LinkAttrs
+}
+
+func (wg *Wireguard) Attrs() *LinkAttrs {
+	return &wg.LinkAttrs
+}
+
+func (wg *Wireguard) Type() string {
+	return "wireguard"
+}
+
 // GenericLink links represent types that are not currently understood
 // by this netlink library.
 type GenericLink struct {

link_linux.go

@@ -1600,6 +1600,8 @@ func LinkDeserialize(hdr *unix.NlMsghdr, m []byte) (Link, error) {
 						link = &Vlan{}
 					case "veth":
 						link = &Veth{}
+					case "wireguard":
+						link = &Wireguard{}
 					case "vxlan":
 						link = &Vxlan{}
 					case "bond":

link_test.go

@@ -117,6 +117,13 @@ func testLinkAddDel(t *testing.T, link Link) {
 		}
 	}
 
+	if _, ok := link.(*Wireguard); ok {
+		_, ok := result.(*Wireguard)
+		if !ok {
+			t.Fatal("Result of create is not a wireguard")
+		}
+	}
+
 	if vxlan, ok := link.(*Vxlan); ok {
 		other, ok := result.(*Vxlan)
 		if !ok {
@@ -1063,6 +1070,13 @@ func TestLinkSetNs(t *testing.T) {
 
 }
 
+func TestLinkAddDelWireguard(t *testing.T) {
+	tearDown := setUpNetlinkTest(t)
+	defer tearDown()
+
+	testLinkAddDel(t, &Wireguard{LinkAttrs: LinkAttrs{Name: "wg0"}})
+}
+
 func TestLinkAddDelVxlan(t *testing.T) {
 	tearDown := setUpNetlinkTest(t)
 	defer tearDown()