ift[n].HardwareAddr = make([]byte, len(sa.Addr))
				copy(ift[n].HardwareAddr, sa.Addr)
			}
			for _, sys := range m.Sys() {
				if imx, ok := sys.(*route.InterfaceMetrics); ok {
					ift[n].MTU = imx.MTU
					break
				}
			}
			n++
			if ifindex == m.Index {
				return ift[:n], nil
			}
		}
	}
	return ift[:n], nil
}

func linkFlags(rawFlags int) Flags {
	var f Flags

}

// Interfaces returns a list of the system's network interfaces.
func Interfaces() ([]Interface, error) {
	ift, err := interfaceTable(0)
	if err != nil {
		return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err}
	}
	if len(ift) != 0 {
		zoneCache.update(ift, false)
	}
	return ift, nil
}

// InterfaceAddrs returns a list of the system's unicast interface
// addresses.
//

		return nil, os.NewSyscallError("parsenetlinkmessage", err)
	}
	var ift []Interface
	if ifi == nil {
		var err error
		ift, err = interfaceTable(0)
		if err != nil {
			return nil, err
		}
	}
	ifat, err := addrTable(ift, ifi, msgs)
	if err != nil {
		return nil, err
	}
	return ifat, nil
}

func addrTable(ift []Interface, ifi *Interface, msgs []syscall.NetlinkMessage) ([]Addr, error) {

		t.Fatal(err)
	}
}

func TestInterfaceUnicastAddrs(t *testing.T) {
	ift, err := Interfaces()
	if err != nil {
		t.Fatal(err)
	}
	ifStats := interfaceStats(ift)
	if err != nil {
		t.Fatal(err)
	}
	var uniStats routeStats
	for _, ifi := range ift {
		ifat, err := ifi.Addrs()
		if err != nil {
			t.Fatal(ifi, err)
		}

	if err != nil {
		return nil, err
	}
	var ift []Interface
	for _, ll := range lls {
		if ifindex != 0 && ifindex != ll.Index {
			continue
		}
		ifi := Interface{Index: ll.Index, MTU: ll.MTU, Name: ll.Name, Flags: linkFlags(ll.Flags)}
		if len(ll.Addr) > 0 {
			ifi.HardwareAddr = HardwareAddr(ll.Addr)
		}
		ift = append(ift, ifi)
	}
	return ift, nil
}

func linkFlags(rawFlags int) Flags {
	var f Flags

			}
			if aa.PhysicalAddressLength > 0 {
				ifi.HardwareAddr = make(HardwareAddr, aa.PhysicalAddressLength)
				copy(ifi.HardwareAddr, aa.PhysicalAddress[:])
			}
			ift = append(ift, ifi)
			if ifindex == ifi.Index {
				break
			}
		}
	}
	return ift, nil
}

// If the ifi is nil, interfaceAddrTable returns addresses for all
// network interfaces. Otherwise it returns addresses for a specific
// interface.

					return nil, err
				}
				ifi.MTU = int(ifr.Ifru[0])<<24 | int(ifr.Ifru[1])<<16 | int(ifr.Ifru[2])<<8 | int(ifr.Ifru[3])

				ift = append(ift, *ifi)
				if ifindex == int(ifm.Index) {
					break
				}
			}
		}
		tab = tab[ifm.Msglen:]
	}

	return ift, nil
}

func linkFlags(rawFlags int32) Flags {
	var f Flags
	if rawFlags&syscall.IFF_UP != 0 {
		f |= FlagUp
	}

	checkNetsh(t)

	toString := func(name string, isup bool) string {
		if isup {
			return name + ":up"
		}
		return name + ":down"
	}

	ift, err := Interfaces()
	if err != nil {
		t.Fatal(err)
	}
	have := make([]string, 0)
	for _, ifi := range ift {
		have = append(have, toString(ifi.Name, ifi.Flags&FlagUp != 0))
	}
	slices.Sort(have)

	ifaces := make(map[string]bool)

}

// LoopbackInterface returns an available logical network interface
// for loopback test.
func LoopbackInterface() (*net.Interface, error) {
	ift, err := net.Interfaces()
	if err != nil {
		return nil, errNoAvailableInterface
	}
	for _, ifi := range ift {
		if ifi.Flags&net.FlagLoopback != 0 && ifi.Flags&net.FlagUp != 0 {
			return &ifi, nil
		}
	}
	return nil, errNoAvailableInterface
}

				t.Skip("skipping test; no gre0 device. likely running in container?")
			}
			t.Fatal(err)
		} else {
			time.Sleep(3 * time.Millisecond)
		}
		ift, err := Interfaces()
		if err != nil {
			ti.teardown()
			t.Fatal(err)
		}
		for _, ifi := range ift {
			if ti.name != ifi.Name {
				continue
			}
			ifat, err := ifi.Addrs()
			if err != nil {
				ti.teardown()
				t.Fatal(err)
			}