Add support for VRF. With this change we can create VRF interface.

$ sudo ip link add vrf1 type vrf table 1

link.go

@@ -659,6 +659,19 @@ func (iptun *Vti) Type() string {
 	return "vti"
 }
 
+type Vrf struct {
+	LinkAttrs
+	Table uint32
+}
+
+func (vrf *Vrf) Attrs() *LinkAttrs {
+	return &vrf.LinkAttrs
+}
+
+func (vrf *Vrf) Type() string {
+	return "vrf"
+}
+
 // iproute2 supported devices;
 // vlan | veth | vcan | dummy | ifb | macvlan | macvtap |
 // bridge | bond | ipoib | ip6tnl | ipip | sit | vxlan |

link_linux.go

@@ -787,6 +787,8 @@ func (h *Handle) LinkAdd(link Link) error {
 		addIptunAttrs(iptun, linkInfo)
 	} else if vti, ok := link.(*Vti); ok {
 		addVtiAttrs(vti, linkInfo)
+	} else if vrf, ok := link.(*Vrf); ok {
+		addVrfAttrs(vrf, linkInfo)
 	}
 
 	req.AddData(linkInfo)
@@ -1014,6 +1016,8 @@ func LinkDeserialize(hdr *syscall.NlMsghdr, m []byte) (Link, error) {
 						link = &Iptun{}
 					case "vti":
 						link = &Vti{}
+					case "vrf":
+						link = &Vrf{}
 					default:
 						link = &GenericLink{LinkType: linkType}
 					}
@@ -1041,6 +1045,8 @@ func LinkDeserialize(hdr *syscall.NlMsghdr, m []byte) (Link, error) {
 						parseIptunData(link, data)
 					case "vti":
 						parseVtiData(link, data)
+					case "vrf":
+						parseVrfData(link, data)
 					}
 				}
 			}
@@ -1617,3 +1623,20 @@ func parseVtiData(link Link, data []syscall.NetlinkRouteAttr) {
 		}
 	}
 }
+
+func addVrfAttrs(vrf *Vrf, linkInfo *nl.RtAttr) {
+	data := nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_DATA, nil)
+	b := make([]byte, 4)
+	native.PutUint32(b, uint32(vrf.Table))
+	nl.NewRtAttrChild(data, nl.IFLA_VRF_TABLE, b)
+}
+
+func parseVrfData(link Link, data []syscall.NetlinkRouteAttr) {
+	vrf := link.(*Vrf)
+	for _, datum := range data {
+		switch datum.Attr.Type {
+		case nl.IFLA_VRF_TABLE:
+			vrf.Table = native.Uint32(datum.Value[0:4])
+		}
+	}
+}

nl/link_linux.go

@@ -447,3 +447,8 @@ const (
 	IFLA_VTI_REMOTE
 	IFLA_VTI_MAX = IFLA_VTI_REMOTE
 )
+
+const (
+	IFLA_VRF_UNSPEC = iota
+	IFLA_VRF_TABLE
+)