rtnetlink: add address label encoding (#138)

Signed-off-by: James Tucker <[email protected]>

Author: raggi

address.go

@@ -202,6 +202,9 @@ func (a *AddressAttributes) encode(ae *netlink.AttributeEncoder) error {
 	if a.Multicast != nil {
 		ae.Do(unix.IFA_MULTICAST, encodeIP(a.Multicast))
 	}
+	if a.Label != "" {
+		ae.String(unix.IFA_LABEL, a.Label)
+	}
 	ae.Uint32(unix.IFA_FLAGS, a.Flags)
 
 	return nil

address_test.go

@@ -53,6 +53,7 @@ func TestAddressMessageMarshalBinary(t *testing.T) {
 				0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 				0x08, 0x00, 0x01, 0x00, 0xc0, 0x00, 0x02, 0x01,
 				0x08, 0x00, 0x04, 0x00, 0xff, 0xff, 0xff, 0xff,
+				0x07, 0x00, 0x03, 0x00, 0x6c, 0x6f, 0x00, 0x00,
 				0x08, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00,
 			},
 		},
@@ -69,7 +70,8 @@ func TestAddressMessageMarshalBinary(t *testing.T) {
 				0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 				0x14, 0x00, 0x01, 0x00, 0x20, 0x01, 0x0d, 0xb8,
 				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-				0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x08, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x07, 0x00, 0x03, 0x00,
+				0x6c, 0x6f, 0x00, 0x00, 0x08, 0x00, 0x08, 0x00,
 				0x00, 0x00, 0x00, 0x00,
 			},
 		},