Beispiel #1
0
func InitDriver(job *engine.Job) engine.Status {
	var (
		network        *net.IPNet
		enableIPTables = job.GetenvBool("EnableIptables")
		icc            = job.GetenvBool("InterContainerCommunication")
		ipForward      = job.GetenvBool("EnableIpForward")
		bridgeIP       = job.Getenv("BridgeIP")
	)

	if defaultIP := job.Getenv("DefaultBindingIP"); defaultIP != "" {
		defaultBindingIP = net.ParseIP(defaultIP)
	}

	bridgeIface = job.Getenv("BridgeIface")
	usingDefaultBridge := false
	if bridgeIface == "" {
		usingDefaultBridge = true
		bridgeIface = DefaultNetworkBridge
	}

	addr, err := networkdriver.GetIfaceAddr(bridgeIface)
	if err != nil {
		// If we're not using the default bridge, fail without trying to create it
		if !usingDefaultBridge {
			job.Logf("bridge not found: %s", bridgeIface)
			return job.Error(err)
		}
		// If the iface is not found, try to create it
		job.Logf("creating new bridge for %s", bridgeIface)
		if err := createBridge(bridgeIP); err != nil {
			return job.Error(err)
		}

		job.Logf("getting iface addr")
		addr, err = networkdriver.GetIfaceAddr(bridgeIface)
		if err != nil {
			return job.Error(err)
		}
		network = addr.(*net.IPNet)
	} else {
		network = addr.(*net.IPNet)
		// validate that the bridge ip matches the ip specified by BridgeIP
		if bridgeIP != "" {
			bip, _, err := net.ParseCIDR(bridgeIP)
			if err != nil {
				return job.Error(err)
			}
			if !network.IP.Equal(bip) {
				return job.Errorf("bridge ip (%s) does not match existing bridge configuration %s", network.IP, bip)
			}
		}
	}

	// Configure iptables for link support
	if enableIPTables {
		if err := setupIPTables(addr, icc); err != nil {
			return job.Error(err)
		}
	}

	if ipForward {
		// Enable IPv4 forwarding
		if err := ioutil.WriteFile("/proc/sys/net/ipv4/ip_forward", []byte{'1', '\n'}, 0644); err != nil {
			job.Logf("WARNING: unable to enable IPv4 forwarding: %s\n", err)
		}
	}

	// We can always try removing the iptables
	if err := iptables.RemoveExistingChain("DOCKER"); err != nil {
		return job.Error(err)
	}

	if enableIPTables {
		chain, err := iptables.NewChain("DOCKER", bridgeIface)
		if err != nil {
			return job.Error(err)
		}
		portmapper.SetIptablesChain(chain)
	}

	bridgeNetwork = network

	// https://github.com/docker/docker/issues/2768
	job.Eng.Hack_SetGlobalVar("httpapi.bridgeIP", bridgeNetwork.IP)

	for name, f := range map[string]engine.Handler{
		"allocate_interface": Allocate,
		"release_interface":  Release,
		"allocate_port":      AllocatePort,
		"link":               LinkContainers,
	} {
		if err := job.Eng.Register(name, f); err != nil {
			return job.Error(err)
		}
	}
	return engine.StatusOK
}
Beispiel #2
0
func InitDriver(job *engine.Job) error {
	var (
		networkv4      *net.IPNet
		networkv6      *net.IPNet
		addrv4         net.Addr
		addrsv6        []net.Addr
		enableIPTables = job.GetenvBool("EnableIptables")
		enableIPv6     = job.GetenvBool("EnableIPv6")
		icc            = job.GetenvBool("InterContainerCommunication")
		ipMasq         = job.GetenvBool("EnableIpMasq")
		ipForward      = job.GetenvBool("EnableIpForward")
		bridgeIP       = job.Getenv("BridgeIP")
		bridgeIPv6     = "fe80::1/64"
		fixedCIDR      = job.Getenv("FixedCIDR")
		fixedCIDRv6    = job.Getenv("FixedCIDRv6")
	)

	if defaultIP := job.Getenv("DefaultBindingIP"); defaultIP != "" {
		defaultBindingIP = net.ParseIP(defaultIP)
	}

	bridgeIface = job.Getenv("BridgeIface")
	usingDefaultBridge := false
	if bridgeIface == "" {
		usingDefaultBridge = true
		bridgeIface = DefaultNetworkBridge
	}

	addrv4, addrsv6, err := networkdriver.GetIfaceAddr(bridgeIface)

	if err != nil {
		// No Bridge existent, create one
		// If we're not using the default bridge, fail without trying to create it
		if !usingDefaultBridge {
			return err
		}

		// If the iface is not found, try to create it
		if err := configureBridge(bridgeIP, bridgeIPv6, enableIPv6); err != nil {
			return err
		}

		addrv4, addrsv6, err = networkdriver.GetIfaceAddr(bridgeIface)
		if err != nil {
			return err
		}

		if fixedCIDRv6 != "" {
			// Setting route to global IPv6 subnet
			log.Infof("Adding route to IPv6 network %q via device %q", fixedCIDRv6, bridgeIface)
			if err := netlink.AddRoute(fixedCIDRv6, "", "", bridgeIface); err != nil {
				log.Fatalf("Could not add route to IPv6 network %q via device %q", fixedCIDRv6, bridgeIface)
			}
		}
	} else {
		// Bridge exists already, getting info...
		// Validate that the bridge ip matches the ip specified by BridgeIP
		if bridgeIP != "" {
			networkv4 = addrv4.(*net.IPNet)
			bip, _, err := net.ParseCIDR(bridgeIP)
			if err != nil {
				return err
			}
			if !networkv4.IP.Equal(bip) {
				return fmt.Errorf("Bridge ip (%s) does not match existing bridge configuration %s", networkv4.IP, bip)
			}
		}

		// A bridge might exist but not have any IPv6 addr associated with it yet
		// (for example, an existing Docker installation that has only been used
		// with IPv4 and docker0 already is set up) In that case, we can perform
		// the bridge init for IPv6 here, else we will error out below if --ipv6=true
		if len(addrsv6) == 0 && enableIPv6 {
			if err := setupIPv6Bridge(bridgeIPv6); err != nil {
				return err
			}
			// Recheck addresses now that IPv6 is setup on the bridge
			addrv4, addrsv6, err = networkdriver.GetIfaceAddr(bridgeIface)
			if err != nil {
				return err
			}
		}

		// TODO: Check if route to fixedCIDRv6 is set
	}

	if enableIPv6 {
		bip6, _, err := net.ParseCIDR(bridgeIPv6)
		if err != nil {
			return err
		}
		found := false
		for _, addrv6 := range addrsv6 {
			networkv6 = addrv6.(*net.IPNet)
			if networkv6.IP.Equal(bip6) {
				found = true
				break
			}
		}
		if !found {
			return fmt.Errorf("Bridge IPv6 does not match existing bridge configuration %s", bip6)
		}
	}

	networkv4 = addrv4.(*net.IPNet)

	if enableIPv6 {
		if len(addrsv6) == 0 {
			return errors.New("IPv6 enabled but no IPv6 detected")
		}
		bridgeIPv6Addr = networkv6.IP
	}

	// Configure iptables for link support
	if enableIPTables {
		if err := setupIPTables(addrv4, icc, ipMasq); err != nil {
			return err
		}

	}

	if ipForward {
		// Enable IPv4 forwarding
		if err := ioutil.WriteFile("/proc/sys/net/ipv4/ip_forward", []byte{'1', '\n'}, 0644); err != nil {
			log.Warnf("WARNING: unable to enable IPv4 forwarding: %s\n", err)
		}

		if fixedCIDRv6 != "" {
			// Enable IPv6 forwarding
			if err := ioutil.WriteFile("/proc/sys/net/ipv6/conf/default/forwarding", []byte{'1', '\n'}, 0644); err != nil {
				log.Warnf("WARNING: unable to enable IPv6 default forwarding: %s\n", err)
			}
			if err := ioutil.WriteFile("/proc/sys/net/ipv6/conf/all/forwarding", []byte{'1', '\n'}, 0644); err != nil {
				log.Warnf("WARNING: unable to enable IPv6 all forwarding: %s\n", err)
			}
		}
	}

	// We can always try removing the iptables
	if err := iptables.RemoveExistingChain("DOCKER", iptables.Nat); err != nil {
		return err
	}

	if enableIPTables {
		_, err := iptables.NewChain("DOCKER", bridgeIface, iptables.Nat)
		if err != nil {
			return err
		}
		chain, err := iptables.NewChain("DOCKER", bridgeIface, iptables.Filter)
		if err != nil {
			return err
		}
		portmapper.SetIptablesChain(chain)
	}

	bridgeIPv4Network = networkv4
	if fixedCIDR != "" {
		_, subnet, err := net.ParseCIDR(fixedCIDR)
		if err != nil {
			return err
		}
		log.Debugf("Subnet: %v", subnet)
		if err := ipAllocator.RegisterSubnet(bridgeIPv4Network, subnet); err != nil {
			return err
		}
	}

	if fixedCIDRv6 != "" {
		_, subnet, err := net.ParseCIDR(fixedCIDRv6)
		if err != nil {
			return err
		}
		log.Debugf("Subnet: %v", subnet)
		if err := ipAllocator.RegisterSubnet(subnet, subnet); err != nil {
			return err
		}
		globalIPv6Network = subnet
	}

	// Block BridgeIP in IP allocator
	ipAllocator.RequestIP(bridgeIPv4Network, bridgeIPv4Network.IP)

	// https://github.com/docker/docker/issues/2768
	job.Eng.Hack_SetGlobalVar("httpapi.bridgeIP", bridgeIPv4Network.IP)

	for name, f := range map[string]engine.Handler{
		"allocate_interface": Allocate,
		"release_interface":  Release,
		"allocate_port":      AllocatePort,
		"link":               LinkContainers,
	} {
		if err := job.Eng.Register(name, f); err != nil {
			return err
		}
	}
	return nil
}