コード例 #1
0
ファイル: network.go プロジェクト: keeb/docker
func newNetworkManager(config *DaemonConfig) (*NetworkManager, error) {
	if config.BridgeIface == DisableNetworkBridge {
		manager := &NetworkManager{
			disabled: true,
		}
		return manager, nil
	}

	addr, err := getIfaceAddr(config.BridgeIface)
	if err != nil {
		// If the iface is not found, try to create it
		if err := CreateBridgeIface(config); err != nil {
			return nil, err
		}
		addr, err = getIfaceAddr(config.BridgeIface)
		if err != nil {
			return nil, err
		}
	}
	network := addr.(*net.IPNet)

	// Configure iptables for link support
	if config.EnableIptables {
		args := []string{"FORWARD", "-i", config.BridgeIface, "-o", config.BridgeIface, "-j"}
		acceptArgs := append(args, "ACCEPT")
		dropArgs := append(args, "DROP")

		if !config.InterContainerCommunication {
			iptables.Raw(append([]string{"-D"}, acceptArgs...)...)
			if !iptables.Exists(dropArgs...) {
				utils.Debugf("Disable inter-container communication")
				if output, err := iptables.Raw(append([]string{"-I"}, dropArgs...)...); err != nil {
					return nil, fmt.Errorf("Unable to prevent intercontainer communication: %s", err)
				} else if len(output) != 0 {
					return nil, fmt.Errorf("Error disabling intercontainer communication: %s", output)
				}
			}
		} else {
			iptables.Raw(append([]string{"-D"}, dropArgs...)...)
			if !iptables.Exists(acceptArgs...) {
				utils.Debugf("Enable inter-container communication")
				if output, err := iptables.Raw(append([]string{"-I"}, acceptArgs...)...); err != nil {
					return nil, fmt.Errorf("Unable to allow intercontainer communication: %s", err)
				} else if len(output) != 0 {
					return nil, fmt.Errorf("Error enabling intercontainer communication: %s", output)
				}
			}
		}
	}

	ipAllocator := newIPAllocator(network)

	tcpPortAllocator, err := newPortAllocator()
	if err != nil {
		return nil, err
	}

	udpPortAllocator, err := newPortAllocator()
	if err != nil {
		return nil, err
	}

	portMapper, err := newPortMapper(config)
	if err != nil {
		return nil, err
	}

	manager := &NetworkManager{
		bridgeIface:      config.BridgeIface,
		bridgeNetwork:    network,
		ipAllocator:      ipAllocator,
		tcpPortAllocator: tcpPortAllocator,
		udpPortAllocator: udpPortAllocator,
		portMapper:       portMapper,
	}

	return manager, nil
}
コード例 #2
0
ファイル: network.go プロジェクト: kelsieflynn/docker
func newNetworkManager(config *DaemonConfig) (*NetworkManager, error) {
	if config.BridgeIface == DisableNetworkBridge {
		manager := &NetworkManager{
			disabled: true,
		}
		return manager, nil
	}

	addr, err := getIfaceAddr(config.BridgeIface)
	if err != nil {
		// If the iface is not found, try to create it
		if err := CreateBridgeIface(config); err != nil {
			return nil, err
		}
		addr, err = getIfaceAddr(config.BridgeIface)
		if err != nil {
			return nil, err
		}
	}
	network := addr.(*net.IPNet)

	// Configure iptables for link support
	if config.EnableIptables {

		// Enable NAT
		natArgs := []string{"POSTROUTING", "-t", "nat", "-s", addr.String(), "!", "-d", addr.String(), "-j", "MASQUERADE"}

		if !iptables.Exists(natArgs...) {
			if output, err := iptables.Raw(append([]string{"-A"}, natArgs...)...); err != nil {
				return nil, fmt.Errorf("Unable to enable network bridge NAT: %s", err)
			} else if len(output) != 0 {
				return nil, fmt.Errorf("Error iptables postrouting: %s", output)
			}
		}

		// Accept incoming packets for existing connections
		existingArgs := []string{"FORWARD", "-o", config.BridgeIface, "-m", "conntrack", "--ctstate", "RELATED,ESTABLISHED", "-j", "ACCEPT"}

		if !iptables.Exists(existingArgs...) {
			if output, err := iptables.Raw(append([]string{"-I"}, existingArgs...)...); err != nil {
				return nil, fmt.Errorf("Unable to allow incoming packets: %s", err)
			} else if len(output) != 0 {
				return nil, fmt.Errorf("Error iptables allow incoming: %s", output)
			}
		}

		// Accept all non-intercontainer outgoing packets
		outgoingArgs := []string{"FORWARD", "-i", config.BridgeIface, "!", "-o", config.BridgeIface, "-j", "ACCEPT"}

		if !iptables.Exists(outgoingArgs...) {
			if output, err := iptables.Raw(append([]string{"-I"}, outgoingArgs...)...); err != nil {
				return nil, fmt.Errorf("Unable to allow outgoing packets: %s", err)
			} else if len(output) != 0 {
				return nil, fmt.Errorf("Error iptables allow outgoing: %s", output)
			}
		}

		args := []string{"FORWARD", "-i", config.BridgeIface, "-o", config.BridgeIface, "-j"}
		acceptArgs := append(args, "ACCEPT")
		dropArgs := append(args, "DROP")

		if !config.InterContainerCommunication {
			iptables.Raw(append([]string{"-D"}, acceptArgs...)...)
			if !iptables.Exists(dropArgs...) {
				utils.Debugf("Disable inter-container communication")
				if output, err := iptables.Raw(append([]string{"-I"}, dropArgs...)...); err != nil {
					return nil, fmt.Errorf("Unable to prevent intercontainer communication: %s", err)
				} else if len(output) != 0 {
					return nil, fmt.Errorf("Error disabling intercontainer communication: %s", output)
				}
			}
		} else {
			iptables.Raw(append([]string{"-D"}, dropArgs...)...)
			if !iptables.Exists(acceptArgs...) {
				utils.Debugf("Enable inter-container communication")
				if output, err := iptables.Raw(append([]string{"-I"}, acceptArgs...)...); err != nil {
					return nil, fmt.Errorf("Unable to allow intercontainer communication: %s", err)
				} else if len(output) != 0 {
					return nil, fmt.Errorf("Error enabling intercontainer communication: %s", output)
				}
			}
		}
	}

	ipAllocator := newIPAllocator(network)

	tcpPortAllocator, err := newPortAllocator()
	if err != nil {
		return nil, err
	}

	udpPortAllocator, err := newPortAllocator()
	if err != nil {
		return nil, err
	}

	portMapper, err := newPortMapper(config)
	if err != nil {
		return nil, err
	}

	manager := &NetworkManager{
		bridgeIface:      config.BridgeIface,
		bridgeNetwork:    network,
		ipAllocator:      ipAllocator,
		tcpPortAllocator: tcpPortAllocator,
		udpPortAllocator: udpPortAllocator,
		portMapper:       portMapper,
	}

	return manager, nil
}