feat: add IFLA_INET6_ADDR_GEN_MODE support

Author: zlava

handle_unspecified.go

@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 package netlink
@@ -183,6 +184,10 @@ func (h *Handle) LinkSetGROIPv4MaxSize(link Link, maxSize int) error {
 	return ErrNotImplemented
 }
 
+func (h *Handle) LinkSetIP6AddrGenMode(link Link, mode int) error {
+	return ErrNotImplemented
+}
+
 func (h *Handle) setProtinfoAttr(link Link, mode bool, attr int) error {
 	return ErrNotImplemented
 }

link_linux.go

@@ -2670,6 +2670,35 @@ func (h *Handle) LinkSetGroup(link Link, group int) error {
 	return err
 }
 
+// LinkSetIP6AddrGenMode sets the IPv6 address generation mode of the link device.
+// Equivalent to: `ip link set $link addrgenmode $mode`
+func LinkSetIP6AddrGenMode(link Link, mode int) error {
+	return pkgHandle.LinkSetIP6AddrGenMode(link, mode)
+}
+
+// LinkSetIP6AddrGenMode sets the IPv6 address generation mode of the link device.
+// Equivalent to: `ip link set $link addrgenmode $mode`
+func (h *Handle) LinkSetIP6AddrGenMode(link Link, mode int) error {
+	base := link.Attrs()
+	h.ensureIndex(base)
+	req := h.newNetlinkRequest(unix.RTM_SETLINK, unix.NLM_F_ACK)
+
+	msg := nl.NewIfInfomsg(unix.AF_UNSPEC)
+	msg.Index = int32(base.Index)
+	req.AddData(msg)
+
+	b := make([]byte, 1)
+	b[0] = uint8(mode)
+
+	data := nl.NewRtAttr(unix.IFLA_INET6_ADDR_GEN_MODE, b)
+	af := nl.NewRtAttr(unix.AF_INET6, data.Serialize())
+	spec := nl.NewRtAttr(unix.IFLA_AF_SPEC, af.Serialize())
+	req.AddData(spec)
+
+	_, err := req.Execute(unix.NETLINK_ROUTE, 0)
+	return err
+}
+
 func addNetkitAttrs(nk *Netkit, linkInfo *nl.RtAttr, flag int) error {
 	if nk.Mode != NETKIT_MODE_L2 && (nk.LinkAttrs.HardwareAddr != nil || nk.peerLinkAttrs.HardwareAddr != nil) {
 		return fmt.Errorf("netkit only allows setting Ethernet in L2 mode")

netlink_unspecified.go

@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 package netlink
@@ -144,6 +145,10 @@ func LinkSetGROIPv4MaxSize(link Link, maxSize int) error {
 	return ErrNotImplemented
 }
 
+func LinkSetIP6AddrGenMode(link Link, mode int) error {
+	return ErrNotImplemented
+}
+
 func LinkAdd(link Link) error {
 	return ErrNotImplemented
 }

nl/link_linux.go

@@ -818,3 +818,10 @@ const (
 	IFLA_BAREUDP_MULTIPROTO_MODE
 	IFLA_BAREUDP_MAX = IFLA_BAREUDP_MULTIPROTO_MODE
 )
+
+const (
+	IN6_ADDR_GEN_MODE_EUI64 = iota
+	IN6_ADDR_GEN_MODE_NONE
+	IN6_ADDR_GEN_MODE_STABLE_PRIVACY
+	IN6_ADDR_GEN_MODE_RANDOM
+)