// and IPv6 IPv4-mapping capability, we can assume
		// that the node listens on a wildcard address with an
		// AF_INET6 socket.
		if supportsIPv4map() && fd.laddr.(*TCPAddr).isWildcard() {
			if fd.family != syscall.AF_INET6 {
				return fmt.Errorf("Listen(%s, %v) returns %v; want %v", fd.net, fd.laddr, fd.family, syscall.AF_INET6)
			}
		} else {
			if fd.family != a.family() {

				Port:          33434,
				FWMark:        0,
				SchedName:     "wlc",
				Flags:         uint32(0 + FlagHashed),
				Timeout:       100,
				Netmask:       128,
				AddressFamily: unix.AF_INET6,
				Address:       netutils.ParseIPSloppy("2012::beef"),
				PEName:        "",
			},
			VirtualServer{
				Address:   netutils.ParseIPSloppy("2012::beef"),
				Protocol:  "UDP",
				Port:      33434,

func (a *Inet6Addr) Family() int { return syscall.AF_INET6 }

func (a *Inet6Addr) lenAndSpace() (int, int) {
	return sizeofSockaddrInet6, roundup(sizeofSockaddrInet6)
}

func (a *Inet6Addr) marshal(b []byte) (int, error) {
	l, ll := a.lenAndSpace()
	if len(b) < ll {
		return 0, errShortBuffer
	}
	b[0] = byte(l)
	b[1] = syscall.AF_INET6
	copy(b[8:24], a.IP[:])
	if a.ZoneID > 0 {

	}

	// TODO(bradfitz,brainman): use ctx more. See TODO below.

	var family int32 = syscall.AF_UNSPEC
	switch ipVersion(network) {
	case '4':
		family = syscall.AF_INET
	case '6':
		family = syscall.AF_INET6
	}

	getaddr := func() ([]IPAddr, error) {
		if err := acquireThread(ctx); err != nil {
			return nil, &DNSError{
				Name:      name,
				Err:       mapErr(err).Error(),

	validateIP := func(ip IP) error {
		switch family {
		case syscall.AF_INET:
			if len(ip) != 4 {
				return &AddrError{
					Err:  "non-IPv4 address",
					Addr: ip.String(),
				}
			}
		case syscall.AF_INET6:
			if len(ip) != 16 {
				return &AddrError{
					Err:  "non-IPv6 address",
					Addr: ip.String(),
				}
			}
		default:
			panic("net: unexpected address family in validateResolvedAddr")
		}

}

func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
	if sa.Port < 0 || sa.Port > 0xFFFF {
		return nil, 0, EINVAL
	}
	sa.raw.Len = SizeofSockaddrInet6
	sa.raw.Family = AF_INET6
	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
	p[0] = byte(sa.Port >> 8)
	p[1] = byte(sa.Port)
	sa.raw.Scope_id = sa.ZoneId
	sa.raw.Addr = sa.Addr
	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
}

// SockaddrInet4 implements the Sockaddr interface for AF_INET type sockets.
type SockaddrInet4 struct {
	Port int
	Addr [4]byte
	raw  RawSockaddrInet4
}

// SockaddrInet6 implements the Sockaddr interface for AF_INET6 type sockets.
type SockaddrInet6 struct {
	Port   int
	ZoneId uint32
	Addr   [16]byte
	raw    RawSockaddrInet6
}

// SockaddrUnix implements the Sockaddr interface for AF_UNIX type sockets.

	return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil
}

func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
	if sa.Port < 0 || sa.Port > 0xFFFF {
		return nil, 0, EINVAL
	}
	sa.raw.Family = AF_INET6
	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
	p[0] = byte(sa.Port >> 8)
	p[1] = byte(sa.Port)
	sa.raw.Scope_id = sa.ZoneId
	sa.raw.Addr = sa.Addr
	return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
}

}

func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
	if sa.Port < 0 || sa.Port > 0xFFFF {
		return nil, 0, EINVAL
	}
	sa.raw.Family = AF_INET6
	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
	p[0] = byte(sa.Port >> 8)
	p[1] = byte(sa.Port)
	sa.raw.Scope_id = sa.ZoneId
	sa.raw.Addr = sa.Addr
	return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
}

}

func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
	if sa.Port < 0 || sa.Port > 0xFFFF {
		return nil, 0, EINVAL
	}
	sa.raw.Len = SizeofSockaddrInet6
	sa.raw.Family = AF_INET6
	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
	p[0] = byte(sa.Port >> 8)
	p[1] = byte(sa.Port)
	sa.raw.Scope_id = sa.ZoneId
	sa.raw.Addr = sa.Addr
	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
}