if err != nil {
		return nil, err
	}
	var addrs []Addr
	if ifi != nil {
		addrs, err = ifi.Addrs()
		if err != nil {
			return nil, err
		}
	} else {
		addrs, err = InterfaceAddrs()
		if err != nil {
			return nil, err
		}
	}

	have4 := gaddr.IP.To4() != nil
	for _, addr := range addrs {
		if ipnet, ok := addr.(*IPNet); ok && (ipnet.IP.To4() != nil) == have4 {

		addr, err := ResolveTCPAddr(network, "www.google.com:http")
		if err != nil {
			t.Error(err)
			continue
		}
		switch {
		case network == "tcp" && addr.IP.To4() == nil:
			fallthrough
		case network == "tcp4" && addr.IP.To4() == nil:
			t.Errorf("got %v; want an IPv4 address on %s", addr, network)
		case network == "tcp6" && (addr.IP.To16() == nil || addr.IP.To4() != nil):

type InterfaceMessage struct {
	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 {

	// Partition addresses into two sets: ones with a known object file, and ones without.
	var addrs, unprocessed []uint64
	for addr, info := range addrMap {
		if info.obj != nil {
			addrs = append(addrs, addr)
		} else {
			unprocessed = append(unprocessed, addr)
		}
	}
	sort.Slice(addrs, func(i, j int) bool { return addrs[i] < addrs[j] })

	const expand = 500 // How much to expand range to pick up nearby addresses.

			sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(*_C_ai_addr(r)))
			addr := IPAddr{IP: copyIP(sa.Addr[:])}
			addrs = append(addrs, addr)
		case _C_AF_INET6:
			sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(*_C_ai_addr(r)))
			addr := IPAddr{IP: copyIP(sa.Addr[:]), Zone: zoneCache.name(int(sa.Scope_id))}
			addrs = append(addrs, addr)
		}
	}
	return addrs, nil
}

				mask = CIDRMask(pfxlen, 8*IPv6len)
			}

			addrs = append(addrs, &IPNet{IP: ip, Mask: mask})
		}
	}

	return addrs, nil
}

// interfaceMulticastAddrTable returns addresses for a specific
// interface.
func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
	return nil, nil

	if err != nil {
		return nil, err
	}
	var addr []net.Addr
	for _, iface := range ifaces {
		if iface.Name == dev {
			continue
		}
		ifadr, err := iface.Addrs()
		if err != nil {
			// This may happen if the interface was deleted. Ignore
			// but log the error.
			klog.ErrorS(err, "Reading addresses", "interface", iface.Name)
			continue
		}
		addr = append(addr, ifadr...)
	}

		addr, err := ResolveIPAddr(tt.network, tt.litAddrOrName)
		if !reflect.DeepEqual(addr, tt.addr) || !reflect.DeepEqual(err, tt.err) {
			t.Errorf("ResolveIPAddr(%q, %q) = %#v, %v, want %#v, %v", tt.network, tt.litAddrOrName, addr, err, tt.addr, tt.err)
			continue
		}
		if err == nil {
			addr2, err := ResolveIPAddr(addr.Network(), addr.String())
			if !reflect.DeepEqual(addr2, tt.addr) || err != tt.err {

	SizeofRtMetrics        = 0x70
)

type ifMsghdr struct {
	Msglen  uint16
	Version uint8
	Type    uint8
	Addrs   int32
	Flags   int32
	Index   uint16
	_       uint16
	Data    ifData
}

type IfMsghdr struct {
	Msglen  uint16
	Version uint8
	Type    uint8
	Addrs   int32
	Flags   int32
	Index   uint16
	Data    IfData
}

type ifData struct {
	Type       uint8

}

// Family implements the Family method of Addr interface.
func (a *Inet6Addr) Family() int { return syscall.AF_INET6 }

// Addrs returns a list of interface addresses.
//
// The provided af must be an address family and name must be a data
// link name. The zero value of af or name means a wildcard.
func Addrs(af int, name string) ([]Addr, error) {
	eps, err := newEndpoints(af)
	if len(eps) == 0 {