Golang ipamutils.ElectInterfaceAddresses函數代碼示例

func ipamOption(bridgeName string) libnetwork.NetworkOption {
	if nw, _, err := ipamutils.ElectInterfaceAddresses(bridgeName); err == nil {
		ipamV4Conf := &libnetwork.IpamConf{PreferredPool: nw.String()}
		hip, _ := types.GetHostPartIP(nw.IP, nw.Mask)
		if hip.IsGlobalUnicast() {
			ipamV4Conf.Gateway = nw.IP.String()
		}
		return libnetwork.NetworkOptionIpam("default", "", []*libnetwork.IpamConf{ipamV4Conf}, nil)
	}
	return nil
}

func getIPv4Data(t *testing.T) []driverapi.IPAMData {
	ipd := driverapi.IPAMData{AddressSpace: "full"}
	nw, _, err := ipamutils.ElectInterfaceAddresses("")
	if err != nil {
		t.Fatal(err)
	}
	ipd.Pool = nw
	// Set network gateway to X.X.X.1
	ipd.Gateway = types.GetIPNetCopy(nw)
	ipd.Gateway.IP[len(ipd.Gateway.IP)-1] = 1
	return []driverapi.IPAMData{ipd}
}

func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error {
	if n, err := controller.NetworkByName("bridge"); err == nil {
		if err = n.Delete(); err != nil {
			return fmt.Errorf("could not delete the default bridge network: %v", err)
		}
	}

	bridgeName := bridge.DefaultBridgeName
	if config.Bridge.Iface != "" {
		bridgeName = config.Bridge.Iface
	}
	netOption := map[string]string{
		bridge.BridgeName:         bridgeName,
		bridge.DefaultBridge:      strconv.FormatBool(true),
		netlabel.DriverMTU:        strconv.Itoa(config.Mtu),
		bridge.EnableIPMasquerade: strconv.FormatBool(config.Bridge.EnableIPMasq),
		bridge.EnableICC:          strconv.FormatBool(config.Bridge.InterContainerCommunication),
	}

	// --ip processing
	if config.Bridge.DefaultIP != nil {
		netOption[bridge.DefaultBindingIP] = config.Bridge.DefaultIP.String()
	}

	ipamV4Conf := libnetwork.IpamConf{}

	ipamV4Conf.AuxAddresses = make(map[string]string)

	if nw, _, err := ipamutils.ElectInterfaceAddresses(bridgeName); err == nil {
		ipamV4Conf.PreferredPool = nw.String()
		hip, _ := types.GetHostPartIP(nw.IP, nw.Mask)
		if hip.IsGlobalUnicast() {
			ipamV4Conf.Gateway = nw.IP.String()
		}
	}

	if config.Bridge.IP != "" {
		ipamV4Conf.PreferredPool = config.Bridge.IP
		ip, _, err := net.ParseCIDR(config.Bridge.IP)
		if err != nil {
			return err
		}
		ipamV4Conf.Gateway = ip.String()
	} else if bridgeName == bridge.DefaultBridgeName && ipamV4Conf.PreferredPool != "" {
		logrus.Infof("Default bridge (%s) is assigned with an IP address %s. Daemon option --bip can be used to set a preferred IP address", bridgeName, ipamV4Conf.PreferredPool)
	}

	if config.Bridge.FixedCIDR != "" {
		_, fCIDR, err := net.ParseCIDR(config.Bridge.FixedCIDR)
		if err != nil {
			return err
		}

		ipamV4Conf.SubPool = fCIDR.String()
	}

	if config.Bridge.DefaultGatewayIPv4 != nil {
		ipamV4Conf.AuxAddresses["DefaultGatewayIPv4"] = config.Bridge.DefaultGatewayIPv4.String()
	}

	var (
		ipamV6Conf     *libnetwork.IpamConf
		deferIPv6Alloc bool
	)
	if config.Bridge.FixedCIDRv6 != "" {
		_, fCIDRv6, err := net.ParseCIDR(config.Bridge.FixedCIDRv6)
		if err != nil {
			return err
		}

		// In case user has specified the daemon flag --fixed-cidr-v6 and the passed network has
		// at least 48 host bits, we need to guarantee the current behavior where the containers'
		// IPv6 addresses will be constructed based on the containers' interface MAC address.
		// We do so by telling libnetwork to defer the IPv6 address allocation for the endpoints
		// on this network until after the driver has created the endpoint and returned the
		// constructed address. Libnetwork will then reserve this address with the ipam driver.
		ones, _ := fCIDRv6.Mask.Size()
		deferIPv6Alloc = ones <= 80

		if ipamV6Conf == nil {
			ipamV6Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)}
		}
		ipamV6Conf.PreferredPool = fCIDRv6.String()
	}

	if config.Bridge.DefaultGatewayIPv6 != nil {
		if ipamV6Conf == nil {
			ipamV6Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)}
		}
		ipamV6Conf.AuxAddresses["DefaultGatewayIPv6"] = config.Bridge.DefaultGatewayIPv6.String()
	}

	v4Conf := []*libnetwork.IpamConf{&ipamV4Conf}
	v6Conf := []*libnetwork.IpamConf{}
	if ipamV6Conf != nil {
		v6Conf = append(v6Conf, ipamV6Conf)
	}
	// Initialize default network on "bridge" with the same name
	_, err := controller.NewNetwork("bridge", "bridge",
		libnetwork.NetworkOptionGeneric(options.Generic{
//.........這裏部分代碼省略.........

func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error {
	if n, err := controller.NetworkByName("bridge"); err == nil {
		if err = n.Delete(); err != nil {
			return fmt.Errorf("could not delete the default bridge network: %v", err)
		}
	}

	bridgeName := bridge.DefaultBridgeName
	if config.Bridge.Iface != "" {
		bridgeName = config.Bridge.Iface
	}
	netOption := map[string]string{
		bridge.BridgeName:         bridgeName,
		bridge.DefaultBridge:      strconv.FormatBool(true),
		netlabel.DriverMTU:        strconv.Itoa(config.Mtu),
		bridge.EnableIPMasquerade: strconv.FormatBool(config.Bridge.EnableIPMasq),
		bridge.EnableICC:          strconv.FormatBool(config.Bridge.InterContainerCommunication),
	}

	// --ip processing
	if config.Bridge.DefaultIP != nil {
		netOption[bridge.DefaultBindingIP] = config.Bridge.DefaultIP.String()
	}

	ipamV4Conf := libnetwork.IpamConf{}

	ipamV4Conf.AuxAddresses = make(map[string]string)

	if nw, _, err := ipamutils.ElectInterfaceAddresses(bridgeName); err == nil {
		ipamV4Conf.PreferredPool = nw.String()
		hip, _ := types.GetHostPartIP(nw.IP, nw.Mask)
		if hip.IsGlobalUnicast() {
			ipamV4Conf.Gateway = nw.IP.String()
		}
	}

	if config.Bridge.IP != "" {
		ipamV4Conf.PreferredPool = config.Bridge.IP
		ip, _, err := net.ParseCIDR(config.Bridge.IP)
		if err != nil {
			return err
		}
		ipamV4Conf.Gateway = ip.String()
	}

	if config.Bridge.FixedCIDR != "" {
		_, fCIDR, err := net.ParseCIDR(config.Bridge.FixedCIDR)
		if err != nil {
			return err
		}

		ipamV4Conf.SubPool = fCIDR.String()
	}

	if config.Bridge.DefaultGatewayIPv4 != nil {
		ipamV4Conf.AuxAddresses["DefaultGatewayIPv4"] = config.Bridge.DefaultGatewayIPv4.String()
	}

	var ipamV6Conf *libnetwork.IpamConf
	if config.Bridge.FixedCIDRv6 != "" {
		_, fCIDRv6, err := net.ParseCIDR(config.Bridge.FixedCIDRv6)
		if err != nil {
			return err
		}
		if ipamV6Conf == nil {
			ipamV6Conf = &libnetwork.IpamConf{}
		}
		ipamV6Conf.PreferredPool = fCIDRv6.String()
	}

	if config.Bridge.DefaultGatewayIPv6 != nil {
		if ipamV6Conf == nil {
			ipamV6Conf = &libnetwork.IpamConf{}
		}
		ipamV6Conf.AuxAddresses["DefaultGatewayIPv6"] = config.Bridge.DefaultGatewayIPv6.String()
	}

	v4Conf := []*libnetwork.IpamConf{&ipamV4Conf}
	v6Conf := []*libnetwork.IpamConf{}
	if ipamV6Conf != nil {
		v6Conf = append(v6Conf, ipamV6Conf)
	}
	// Initialize default network on "bridge" with the same name
	_, err := controller.NewNetwork("bridge", "bridge",
		libnetwork.NetworkOptionGeneric(options.Generic{
			netlabel.GenericData: netOption,
			netlabel.EnableIPv6:  config.Bridge.EnableIPv6,
		}),
		libnetwork.NetworkOptionIpam("default", "", v4Conf, v6Conf))
	if err != nil {
		return fmt.Errorf("Error creating default \"bridge\" network: %v", err)
	}
	return nil
}

//Bridge網橋的初始化，以這個為重點分析。
func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error {
	if n, err := controller.NetworkByName("bridge"); err == nil {
		if err = n.Delete(); err != nil {
			return fmt.Errorf("could not delete the default bridge network: %v", err)
		}
	}

	//配置默認網橋模式的interface的名稱，默認為dockerO
	bridgeName := bridge.DefaultBridgeName
	if config.bridgeConfig.Iface != "" {
		bridgeName = config.bridgeConfig.Iface
	}
	//bridge網絡的默認配置。
	netOption := map[string]string{
		bridge.BridgeName:         bridgeName,
		bridge.DefaultBridge:      strconv.FormatBool(true),
		netlabel.DriverMTU:        strconv.Itoa(config.Mtu),
		bridge.EnableIPMasquerade: strconv.FormatBool(config.bridgeConfig.EnableIPMasq),
		bridge.EnableICC:          strconv.FormatBool(config.bridgeConfig.InterContainerCommunication),
	}

	//配置docker0的默認IP地址。
	if config.bridgeConfig.DefaultIP != nil {
		netOption[bridge.DefaultBindingIP] = config.bridgeConfig.DefaultIP.String()
	}

	var (
		ipamV4Conf *libnetwork.IpamConf
		ipamV6Conf *libnetwork.IpamConf
	)

	ipamV4Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)}

	nw, nw6List, err := ipamutils.ElectInterfaceAddresses(bridgeName)
	if err == nil {
		ipamV4Conf.PreferredPool = lntypes.GetIPNetCanonical(nw).String()
		hip, _ := lntypes.GetHostPartIP(nw.IP, nw.Mask)
		if hip.IsGlobalUnicast() {
			ipamV4Conf.Gateway = nw.IP.String()
		}
	}

	if config.bridgeConfig.IP != "" {
		ipamV4Conf.PreferredPool = config.bridgeConfig.IP
		ip, _, err := net.ParseCIDR(config.bridgeConfig.IP)
		if err != nil {
			return err
		}
		ipamV4Conf.Gateway = ip.String()
	} else if bridgeName == bridge.DefaultBridgeName && ipamV4Conf.PreferredPool != "" {
		logrus.Infof("Default bridge (%s) is assigned with an IP address %s. Daemon option --bip can be used to set a preferred IP address", bridgeName, ipamV4Conf.PreferredPool)
	}

	if config.bridgeConfig.FixedCIDR != "" {
		_, fCIDR, err := net.ParseCIDR(config.bridgeConfig.FixedCIDR)
		if err != nil {
			return err
		}

		ipamV4Conf.SubPool = fCIDR.String()
	}

	if config.bridgeConfig.DefaultGatewayIPv4 != nil {
		ipamV4Conf.AuxAddresses["DefaultGatewayIPv4"] = config.bridgeConfig.DefaultGatewayIPv4.String()
	}

	var deferIPv6Alloc bool
	if config.bridgeConfig.FixedCIDRv6 != "" {
		_, fCIDRv6, err := net.ParseCIDR(config.bridgeConfig.FixedCIDRv6)
		if err != nil {
			return err
		}

		// In case user has specified the daemon flag --fixed-cidr-v6 and the passed network has
		// at least 48 host bits, we need to guarantee the current behavior where the containers'
		// IPv6 addresses will be constructed based on the containers' interface MAC address.
		// We do so by telling libnetwork to defer the IPv6 address allocation for the endpoints
		// on this network until after the driver has created the endpoint and returned the
		// constructed address. Libnetwork will then reserve this address with the ipam driver.
		ones, _ := fCIDRv6.Mask.Size()
		deferIPv6Alloc = ones <= 80

		if ipamV6Conf == nil {
			ipamV6Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)}
		}
		ipamV6Conf.PreferredPool = fCIDRv6.String()

		// In case the --fixed-cidr-v6 is specified and the current docker0 bridge IPv6
		// address belongs to the same network, we need to inform libnetwork about it, so
		// that it can be reserved with IPAM and it will not be given away to somebody else
		for _, nw6 := range nw6List {
			if fCIDRv6.Contains(nw6.IP) {
				ipamV6Conf.Gateway = nw6.IP.String()
				break
			}
		}
	}

	if config.bridgeConfig.DefaultGatewayIPv6 != nil {
//.........這裏部分代碼省略.........