if len(b) < 8 {
		return nil, errInvalidAddr
	}
	_, a, err := parseKernelLinkAddr(syscall.AF_LINK, b[4:])
	if err != nil {
		return nil, err
	}
	a.(*LinkAddr).Index = int(nativeEndian.Uint16(b[2:4]))
	return a, nil
}

// parseKernelLinkAddr parses b as a link-layer address in
// conventional BSD kernel form.
func parseKernelLinkAddr(_ int, b []byte) (int, Addr, error) {
	// The encoding looks like the following: