Type:    int(b[3]),
		Flags:   int(nativeEndian.Uint32(b[8:12])),
		Index:   int(nativeEndian.Uint16(b[4:6])),
		ID:      uintptr(nativeEndian.Uint32(b[16:20])),
		Seq:     int(nativeEndian.Uint32(b[20:24])),
		extOff:  w.extOff,
		raw:     b[:l],
	}
	errno := syscall.Errno(nativeEndian.Uint32(b[28:32]))
	if errno != 0 {
		m.Err = errno
	}
	var err error

	}
	m := &InterfaceMessage{
		Version: int(b[2]),
		Type:    int(b[3]),
		Addrs:   make([]Addr, syscall.RTAX_MAX),
		Flags:   int(nativeEndian.Uint32(b[8:12])),
		Index:   int(nativeEndian.Uint16(b[12:14])),
		extOff:  w.extOff,
		raw:     b[:l],
	}
	a, err := parseLinkAddr(b[w.bodyOff:])
	if err != nil {
		return nil, err
	}
	m.Addrs[syscall.RTAX_IFP] = a
	m.Name = a.(*LinkAddr).Name
	return m, nil
}

	kernelAlign, wireFormats = probeRoutingStack()
}

func roundup(l int) int {
	if l == 0 {
		return kernelAlign
	}
	return (l + kernelAlign - 1) &^ (kernelAlign - 1)
}

type wireFormat struct {
	extOff  int // offset of header extension
	bodyOff int // offset of message body
	parse   func(RIBType, []byte) (Message, error)

	Version int    // message version
	Type    int    // message type
	Flags   int    // interface flags
	Index   int    // interface index
	Name    string // interface name
	Addrs   []Addr // addresses

	extOff int    // offset of header extension
	raw    []byte // raw message
}

// An InterfaceAddrMessage represents an interface address message.
type InterfaceAddrMessage struct {
	Version int    // message version

	ID      uintptr // sender's identifier; usually process ID
	Seq     int     // sequence number
	Err     error   // error on requested operation
	Addrs   []Addr  // addresses

	extOff int    // offset of header extension
	raw    []byte // raw message
}

// Marshal returns the binary encoding of m.
func (m *RouteMessage) Marshal() ([]byte, error) {
	return m.marshal()
}