Add support for alternative names

This commit add the support for alternative names. exposing the attributes in the link object. also adding the add and delete functions Signed-off-by: Sebastian Sch <[email protected]>
vishvananda · Sep 27, 2023 · 2e05126 · 2e05126
1 parent a4fcbb7
commit 2e05126
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diff --git a/link.go b/link.go
@@ -33,6 +33,7 @@ type LinkAttrs struct {
 	MasterIndex    int         // must be the index of a bridge
 	Namespace      interface{} // nil | NsPid | NsFd
 	Alias          string
+	AltNames     []string
 	Statistics     *LinkStatistics
 	Promisc        int
 	Allmulti       int

diff --git a/link_linux.go b/link_linux.go
@@ -497,6 +497,58 @@ func (h *Handle) LinkSetAlias(link Link, name string) error {
 	return err
 }
 
+// LinkAddAltName adds a new alternative name for the link device.
+// Equivalent to: `ip link property add $link altname $name`
+func LinkAddAltName(link Link, name string) error {
+	return pkgHandle.LinkAddAltName(link, name)
+}
+
+// LinkAddAltName adds a new alternative name for the link device.
+// Equivalent to: `ip link property add $link altname $name`
+func (h *Handle) LinkAddAltName(link Link, name string) error {
+	base := link.Attrs()
+	h.ensureIndex(base)
+	req := h.newNetlinkRequest(unix.RTM_NEWLINKPROP, unix.NLM_F_ACK|unix.NLM_F_EXCL|unix.NLM_F_CREATE|unix.NLM_F_APPEND)
+
+	msg := nl.NewIfInfomsg(unix.AF_UNSPEC)
+	msg.Index = int32(base.Index)
+	req.AddData(msg)
+
+	data := nl.NewRtAttr(unix.IFLA_PROP_LIST|unix.NLA_F_NESTED, nil)
+	data.AddRtAttr(unix.IFLA_ALT_IFNAME, []byte(name))
+
+	req.AddData(data)
+
+	_, err := req.Execute(unix.NETLINK_ROUTE, 0)
+	return err
+}
+
+// LinkDelAltName delete a new alternative name for the link device.
+// Equivalent to: `ip link property del $link altname $name`
+func LinkDelAltName(link Link, name string) error {
+	return pkgHandle.LinkDelAltName(link, name)
+}
+
+// LinkDelAltName delete a new alternative name for the link device.
+// Equivalent to: `ip link property del $link altname $name`
+func (h *Handle) LinkDelAltName(link Link, name string) error {
+	base := link.Attrs()
+	h.ensureIndex(base)
+	req := h.newNetlinkRequest(unix.RTM_DELLINKPROP, unix.NLM_F_ACK|unix.NLM_F_EXCL|unix.NLM_F_CREATE|unix.NLM_F_APPEND)
+
+	msg := nl.NewIfInfomsg(unix.AF_UNSPEC)
+	msg.Index = int32(base.Index)
+	req.AddData(msg)
+
+	data := nl.NewRtAttr(unix.IFLA_PROP_LIST|unix.NLA_F_NESTED, nil)
+	data.AddRtAttr(unix.IFLA_ALT_IFNAME, []byte(name))
+
+	req.AddData(data)
+
+	_, err := req.Execute(unix.NETLINK_ROUTE, 0)
+	return err
+}
+
 // LinkSetHardwareAddr sets the hardware address of the link device.
 // Equivalent to: `ip link set $link address $hwaddr`
 func LinkSetHardwareAddr(link Link, hwaddr net.HardwareAddr) error {
@@ -2128,6 +2180,18 @@ func LinkDeserialize(hdr *unix.NlMsghdr, m []byte) (Link, error) {
 				protinfo := parseProtinfo(attrs)
 				base.Protinfo = &protinfo
 			}
+		case unix.IFLA_PROP_LIST | unix.NLA_F_NESTED:
+			attrs, err := nl.ParseRouteAttr(attr.Value[:])
+			if err != nil {
+				return nil, err
+			}
+
+			base.AltNames = []string{}
+			for _, attr := range attrs {
+				if attr.Attr.Type == unix.IFLA_ALT_IFNAME {
+					base.AltNames = append(base.AltNames, string(attr.Value[:len(attr.Value)-1]))
+				}
+			}
 		case unix.IFLA_OPERSTATE:
 			base.OperState = LinkOperState(uint8(attr.Value[0]))
 		case unix.IFLA_PHYS_SWITCH_ID: