func configureIface(ifname string, ipn ip.IP4Net, mtu int) error {
	iface, err := netlink.LinkByName(ifname)
	if err != nil {
		return fmt.Errorf("failed to lookup interface %v", ifname)
	}

	err = netlink.AddrAdd(iface, &netlink.Addr{IPNet: ipn.ToIPNet(), Label: ""})
	if err != nil {
		return fmt.Errorf("failed to add IP address %v to %v: %v", ipn.String(), ifname, err)
	}

	err = netlink.LinkSetMTU(iface, mtu)
	if err != nil {
		return fmt.Errorf("failed to set MTU for %v: %v", ifname, err)
	}

	err = netlink.LinkSetUp(iface)
	if err != nil {
		return fmt.Errorf("failed to set interface %v to UP state: %v", ifname, err)
	}

	// explicitly add a route since there might be a route for a subnet already
	// installed by Docker and then it won't get auto added
	err = netlink.RouteAdd(&netlink.Route{
		LinkIndex: iface.Attrs().Index,
		Scope:     netlink.SCOPE_UNIVERSE,
		Dst:       ipn.Network().ToIPNet(),
	})
	if err != nil && err != syscall.EEXIST {
		return fmt.Errorf("failed to add route (%v -> %v): %v", ipn.Network().String(), ifname, err)
	}

	return nil
}

// Set the link mtu
func setLinkMtu(name string, mtu int) error {
	iface, err := netlink.LinkByName(name)
	if err != nil {
		return err
	}
	return netlink.LinkSetMTU(iface, mtu)
}

func applyNetConf(link netlink.Link, netConf config.InterfaceConfig) error {
	if netConf.DHCP {
		log.Infof("Running DHCP on %s", link.Attrs().Name)
		cmd := exec.Command("dhcpcd", "-A4", "-e", "force_hostname=true", link.Attrs().Name)
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
		if err := cmd.Run(); err != nil {
			log.Error(err)
		}
	} else if netConf.IPV4LL {
		if err := AssignLinkLocalIP(link); err != nil {
			log.Error("IPV4LL set failed")
			return err
		}
	} else if netConf.Address == "" {
		return nil
	} else {
		addr, err := netlink.ParseAddr(netConf.Address)
		if err != nil {
			return err
		}
		if err := netlink.AddrAdd(link, addr); err != nil {
			log.Error("addr add failed")
			return err
		}
		log.Infof("Set %s on %s", netConf.Address, link.Attrs().Name)
	}

	if netConf.MTU > 0 {
		if err := netlink.LinkSetMTU(link, netConf.MTU); err != nil {
			log.Error("set MTU Failed")
			return err
		}
	}

	if err := netlink.LinkSetUp(link); err != nil {
		log.Error("failed to setup link")
		return err
	}

	if netConf.Gateway != "" {
		gatewayIp := net.ParseIP(netConf.Gateway)
		if gatewayIp == nil {
			return errors.New("Invalid gateway address " + netConf.Gateway)
		}

		route := netlink.Route{
			Scope: netlink.SCOPE_UNIVERSE,
			Gw:    net.ParseIP(netConf.Gateway),
		}
		if err := netlink.RouteAdd(&route); err != nil {
			log.Error("gateway set failed")
			return err
		}

		log.Infof("Set default gateway %s", netConf.Gateway)
	}

	return nil
}

// attach a container network interface to an external network
func (v *veth) attach(n *configs.Network) (err error) {
	brl, err := netlink.LinkByName(n.Bridge)
	if err != nil {
		return err
	}
	br, ok := brl.(*netlink.Bridge)
	if !ok {
		return fmt.Errorf("Wrong device type %T", brl)
	}
	host, err := netlink.LinkByName(n.HostInterfaceName)
	if err != nil {
		return err
	}

	if err := netlink.LinkSetMaster(host, br); err != nil {
		return err
	}
	if err := netlink.LinkSetMTU(host, n.Mtu); err != nil {
		return err
	}
	if n.HairpinMode {
		if err := netlink.LinkSetHairpin(host, true); err != nil {
			return err
		}
	}
	if err := netlink.LinkSetUp(host); err != nil {
		return err
	}

	return nil
}

func (driver *driver) joinEndpoint(w http.ResponseWriter, r *http.Request) {
	var j join
	if err := json.NewDecoder(r.Body).Decode(&j); err != nil {
		sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
		return
	}
	log.Debugf("Join request: %+v", &j)

	endID := j.EndpointID
	// unique name while still on the common netns
	preMoveName := endID[:5]
	mode, err := setVlanMode(macvlanMode)
	if err != nil {
		log.Errorf("error parsing vlan mode [ %v ]: %s", mode, err)
		return
	}
	// Get the link for the master index (Example: the docker host eth iface)
	hostEth, err := netlink.LinkByName(macvlanEthIface)
	if err != nil {
		log.Warnf("Error looking up the parent iface [ %s ] mode: [ %s ] error: [ %s ]", macvlanEthIface, mode, err)
	}
	macvlan := &netlink.Macvlan{
		LinkAttrs: netlink.LinkAttrs{
			Name:        preMoveName,
			ParentIndex: hostEth.Attrs().Index,
		},
		Mode: mode,
	}
	if err := netlink.LinkAdd(macvlan); err != nil {
		log.Errorf("failed to create Macvlan: [ %v ] with the error: %s", macvlan, err)
		log.Error("Ensure there are no existing [ ipvlan ] type links and remove with 'ip link del <link_name>'," +
			" also check `/var/run/docker/netns/` for orphaned links to unmount and delete, then restart the plugin")
		return
	}
	log.Infof("Created Macvlan port: [ %s ] using the mode: [ %s ]", macvlan.Name, macvlanMode)
	// Set the netlink iface MTU, default is 1500
	if err := netlink.LinkSetMTU(macvlan, defaultMTU); err != nil {
		log.Errorf("Error setting the MTU [ %d ] for link [ %s ]: %s", defaultMTU, macvlan.Name, err)
	}
	// Bring the netlink iface up
	if err := netlink.LinkSetUp(macvlan); err != nil {
		log.Warnf("failed to enable the [ macvlan ] netlink link: [ %v ]", macvlan, err)
	}
	// SrcName gets renamed to DstPrefix on the container iface
	ifname := &InterfaceName{
		SrcName:   macvlan.Name,
		DstPrefix: containerIfacePrefix,
	}
	res := &joinResponse{
		InterfaceName: *ifname,
		Gateway:       gatewayIP,
	}
	objectResponse(w, res)
	log.Debugf("Join endpoint %s:%s to %s", j.NetworkID, j.EndpointID, j.SandboxKey)
}

func (Link) SetMTU(intf *net.Interface, mtu int) error {
	netlinkMu.Lock()
	defer netlinkMu.Unlock()

	link, err := netlink.LinkByName(intf.Name)
	if err != nil {
		return errF(err)
	}

	return errF(netlink.LinkSetMTU(link, mtu))
}

func (driver *driver) JoinEndpoint(j *netApi.JoinRequest) (*netApi.JoinResponse, error) {
	log.Debugf("Join endpoint request: %+v", j)
	log.Debugf("Joining endpoint %s:%s to %s", j.NetworkID, j.EndpointID, j.SandboxKey)

	tempName := j.EndpointID[:4]
	hostName := "vethr" + j.EndpointID[:4]

	veth := &netlink.Veth{
		LinkAttrs: netlink.LinkAttrs{
			Name:   hostName,
			TxQLen: 0,
		},
		PeerName: tempName,
	}
	log.Debugf("Adding link %+v", veth)
	if err := netlink.LinkAdd(veth); err != nil {
		log.Errorf("Unable to add link %+v:%+v", veth, err)
		return nil, err
	}
	if err := netlink.LinkSetMTU(veth, 1500); err != nil {
		log.Errorf("Error setting the MTU %s", err)
	}
	log.Debugf("Bringing link up %+v", veth)
	if err := netlink.LinkSetUp(veth); err != nil {
		log.Errorf("Unable to bring up %+v: %+v", veth, err)
		return nil, err
	}
	ep := driver.network.endpoints[j.EndpointID]
	ep.iface = hostName

	iface, _ := netlink.LinkByName(hostName)
	routeAdd(ep.ipv4Address, iface)

	for _, ipa := range ep.ipAliases {
		routeAdd(ipa, iface)
	}
	respIface := &netApi.InterfaceName{
		SrcName:   tempName,
		DstPrefix: "eth",
	}
	sandboxRoute := netApi.StaticRoute{
		Destination: "0.0.0.0/0",
		RouteType:   1, // CONNECTED
		NextHop:     "",
	}
	resp := &netApi.JoinResponse{
		InterfaceName:         respIface,
		DisableGatewayService: true,
		StaticRoutes:          []netApi.StaticRoute{sandboxRoute},
	}
	log.Infof("Join Request Response %+v", resp)

	return resp, nil
}

func applyNetConf(link netlink.Link, netConf InterfaceConfig) error {
	if netConf.IPV4LL {
		if err := AssignLinkLocalIP(link); err != nil {
			log.Errorf("IPV4LL set failed: %v", err)
			return err
		}
	} else if netConf.Address == "" {
		return nil
	} else {
		addr, err := netlink.ParseAddr(netConf.Address)
		if err != nil {
			return err
		}
		if err := netlink.AddrAdd(link, addr); err != nil {
			//Ignore this error
			log.Errorf("addr add failed: %v", err)
		} else {
			log.Infof("Set %s on %s", netConf.Address, link.Attrs().Name)
		}
	}

	if netConf.MTU > 0 {
		if err := netlink.LinkSetMTU(link, netConf.MTU); err != nil {
			log.Errorf("set MTU Failed: %v", err)
			return err
		}
	}

	if err := netlink.LinkSetUp(link); err != nil {
		log.Errorf("failed to setup link: %v", err)
		return err
	}

	if netConf.Gateway != "" {
		gatewayIp := net.ParseIP(netConf.Gateway)
		if gatewayIp == nil {
			return errors.New("Invalid gateway address " + netConf.Gateway)
		}

		route := netlink.Route{
			Scope: netlink.SCOPE_UNIVERSE,
			Gw:    net.ParseIP(netConf.Gateway),
		}
		if err := netlink.RouteAdd(&route); err != nil {
			log.Errorf("gateway set failed: %v", err)
			return err
		}

		log.Infof("Set default gateway %s", netConf.Gateway)
	}

	return nil
}

// SetupVeth sets up the net interface, the temporary interface and fills up some endpoint
// fields such as LXCMAC, NodeMac, IfIndex and IfName. Returns a pointer for the created
// veth, a pointer for the temporary link, the name of the temporary link and error if
// something fails.
func SetupVeth(id string, mtu int, ep *endpoint.Endpoint) (*netlink.Veth, *netlink.Link, string, error) {

	lxcIfName := Endpoint2IfName(id)
	tmpIfName := temporaryInterfacePrefix + id[:5]

	veth := &netlink.Veth{
		LinkAttrs: netlink.LinkAttrs{Name: lxcIfName},
		PeerName:  tmpIfName,
	}

	if err := netlink.LinkAdd(veth); err != nil {
		return nil, nil, "", fmt.Errorf("unable to create veth pair: %s", err)
	}
	var err error
	defer func() {
		if err != nil {
			if err = netlink.LinkDel(veth); err != nil {
				log.Warningf("failed to clean up veth %q: %s", veth.Name, err)
			}
		}
	}()

	log.Debugf("Created veth pair %s <-> %s", lxcIfName, veth.PeerName)

	// Disable reverse path filter on the host side veth peer to allow
	// container addresses to be used as source address when the linux
	// stack performs routing.
	args := []string{"-w", "net.ipv4.conf." + lxcIfName + ".rp_filter=0"}
	_, err = exec.Command("sysctl", args...).CombinedOutput()
	if err != nil {
		return nil, nil, "", fmt.Errorf("unable to disable rp_filter on %s: %s",
			lxcIfName, err)
	}

	peer, err := netlink.LinkByName(tmpIfName)
	if err != nil {
		return nil, nil, "", fmt.Errorf("unable to lookup veth peer just created: %s", err)
	}

	if err = netlink.LinkSetMTU(peer, mtu); err != nil {
		return nil, nil, "", fmt.Errorf("unable to set MTU to %q: %s", tmpIfName, err)
	}

	hostVeth, err := netlink.LinkByName(lxcIfName)
	if err != nil {
		return nil, nil, "", fmt.Errorf("unable to lookup veth just created: %s", err)
	}

	if err = netlink.LinkSetMTU(hostVeth, mtu); err != nil {
		return nil, nil, "", fmt.Errorf("unable to set MTU to %q: %s", lxcIfName, err)
	}

	if err = netlink.LinkSetUp(veth); err != nil {
		return nil, nil, "", fmt.Errorf("unable to bring up veth pair: %s", err)
	}

	ep.LXCMAC = mac.MAC(peer.Attrs().HardwareAddr)
	ep.NodeMAC = mac.MAC(hostVeth.Attrs().HardwareAddr)
	ep.IfIndex = hostVeth.Attrs().Index
	ep.IfName = lxcIfName

	return veth, &peer, tmpIfName, nil
}

// Join creates a MACVLAN interface to be moved to the container netns
func (d *Driver) Join(r *sdk.JoinRequest) (*sdk.JoinResponse, error) {
	log.Debugf("Join request: %+v", &r)
	getID, err := d.getNetwork(r.NetworkID)
	if err != nil {
		// Init any existing libnetwork networks
		d.existingNetChecks()

		getID, err = d.getNetwork(r.NetworkID)
		if err != nil {
			return nil, fmt.Errorf("error getting network ID [ %s ]. Run 'docker network ls' or 'docker network create' Err: %v", r.NetworkID, err)
		}
	}
	endID := r.EndpointID
	// unique name while still on the common netns
	preMoveName := endID[:5]
	mode, err := setVlanMode("bridge")
	if err != nil {
		return nil, fmt.Errorf("error getting vlan mode [ %v ]: %s", mode, err)
	}
	if getID.ifaceOpt == "" {
		return nil, fmt.Errorf("Required macvlan parent interface is missing, please recreate the network specifying the -o host_iface=ethX")
	}
	// Get the link for the master index (Example: the docker host eth iface)
	hostEth, err := netlink.LinkByName(getID.ifaceOpt)
	if err != nil {
		log.Warnf("Error looking up the parent iface [ %s ] error: [ %s ]", getID.ifaceOpt, err)
	}
	mvlan := &netlink.Macvlan{
		LinkAttrs: netlink.LinkAttrs{
			Name:        preMoveName,
			ParentIndex: hostEth.Attrs().Index,
		},
		Mode: mode,
	}
	if err := netlink.LinkAdd(mvlan); err != nil {
		log.Warnf("Failed to create the netlink link: [ %v ] with the "+
			"error: %s Note: a parent index cannot be link to both macvlan "+
			"and macvlan simultaneously. A new parent index is required", mvlan, err)
		log.Warnf("Also check `/var/run/docker/netns/` for orphaned links to unmount and delete, then restart the plugin")
		log.Warnf("Run this to clean orphaned links 'umount /var/run/docker/netns/* && rm /var/run/docker/netns/*'")
	}
	// Set the netlink iface MTU, default is 1500
	if err := netlink.LinkSetMTU(mvlan, defaultMTU); err != nil {
		log.Errorf("Error setting the MTU [ %d ] for link [ %s ]: %s", defaultMTU, mvlan.Name, err)
	}
	// Bring the netlink iface up
	if err := netlink.LinkSetUp(mvlan); err != nil {
		log.Warnf("failed to enable the macvlan netlink link: [ %v ]", mvlan, err)
	}
	// SrcName gets renamed to DstPrefix on the container iface
	ifname := &sdk.InterfaceName{
		SrcName:   mvlan.Name,
		DstPrefix: containerIfacePrefix,
	}

	res := &sdk.JoinResponse{
		InterfaceName:         *ifname,
		Gateway:               getID.gateway,
		DisableGatewayService: true,
	}
	log.Debugf("Join response: %+v", res)
	log.Debugf("Join endpoint %s:%s to %s", r.NetworkID, r.EndpointID, r.SandboxKey)
	return res, nil
}

// Join method is invoked when a Sandbox is attached to an endpoint.
func (d *driver) Join(nid, eid string, sboxKey string, jinfo driverapi.JoinInfo, options map[string]interface{}) error {
	if err := validateID(nid, eid); err != nil {
		return err
	}

	n := d.network(nid)
	if n == nil {
		return fmt.Errorf("could not find network with id %s", nid)
	}

	ep := n.endpoint(eid)
	if ep == nil {
		return fmt.Errorf("could not find endpoint with id %s", eid)
	}

	s := n.getSubnetforIP(ep.addr)
	if s == nil {
		return fmt.Errorf("could not find subnet for endpoint %s", eid)
	}

	if err := n.obtainVxlanID(s); err != nil {
		return fmt.Errorf("couldn't get vxlan id for %q: %v", s.subnetIP.String(), err)
	}

	if err := n.joinSandbox(); err != nil {
		return fmt.Errorf("network sandbox join failed: %v", err)
	}

	if err := n.joinSubnetSandbox(s); err != nil {
		return fmt.Errorf("subnet sandbox join failed for %q: %v", s.subnetIP.String(), err)
	}

	// joinSubnetSandbox gets called when an endpoint comes up on a new subnet in the
	// overlay network. Hence the Endpoint count should be updated outside joinSubnetSandbox
	n.incEndpointCount()

	sbox := n.sandbox()

	name1, name2, err := createVethPair()
	if err != nil {
		return err
	}

	// Set the container interface and its peer MTU to 1450 to allow
	// for 50 bytes vxlan encap (inner eth header(14) + outer IP(20) +
	// outer UDP(8) + vxlan header(8))
	veth, err := netlink.LinkByName(name1)
	if err != nil {
		return fmt.Errorf("cound not find link by name %s: %v", name1, err)
	}
	err = netlink.LinkSetMTU(veth, vxlanVethMTU)
	if err != nil {
		return err
	}

	if err := sbox.AddInterface(name1, "veth",
		sbox.InterfaceOptions().Master(s.brName)); err != nil {
		return fmt.Errorf("could not add veth pair inside the network sandbox: %v", err)
	}

	veth, err = netlink.LinkByName(name2)
	if err != nil {
		return fmt.Errorf("could not find link by name %s: %v", name2, err)
	}
	err = netlink.LinkSetMTU(veth, vxlanVethMTU)
	if err != nil {
		return err
	}

	if err := netlink.LinkSetHardwareAddr(veth, ep.mac); err != nil {
		return fmt.Errorf("could not set mac address (%v) to the container interface: %v", ep.mac, err)
	}

	for _, sub := range n.subnets {
		if sub == s {
			continue
		}
		if err := jinfo.AddStaticRoute(sub.subnetIP, types.NEXTHOP, s.gwIP.IP); err != nil {
			log.Errorf("Adding subnet %s static route in network %q failed\n", s.subnetIP, n.id)
		}
	}

	if iNames := jinfo.InterfaceName(); iNames != nil {
		err = iNames.SetNames(name2, "eth")
		if err != nil {
			return err
		}
	}

	d.peerDbAdd(nid, eid, ep.addr.IP, ep.addr.Mask, ep.mac,
		net.ParseIP(d.bindAddress), true)
	d.pushLocalEndpointEvent("join", nid, eid)

	return nil
}

func (driver *driver) joinEndpoint(w http.ResponseWriter, r *http.Request) {
	var j join
	if err := json.NewDecoder(r.Body).Decode(&j); err != nil {
		sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
		return
	}
	log.Debugf("Join request: %+v", &j)

	endID := j.EndpointID
	// unique name while still on the common netns
	preMoveName := endID[:5]
	mode, err := getIPVlanMode(ipVlanMode)
	if err != nil {
		log.Errorf("error getting vlan mode [ %v ]: %s", mode, err)
		return
	}
	// Get the link for the master index (Example: the docker host eth iface)
	hostEth, err := netlink.LinkByName(ipVlanEthIface)
	if err != nil {
		log.Warnf("Error looking up the parent iface [ %s ] error: [ %s ]", ipVlanEthIface, err)
	}
	ipvlan := &netlink.IPVlan{
		LinkAttrs: netlink.LinkAttrs{
			Name:        preMoveName,
			ParentIndex: hostEth.Attrs().Index,
			TxQLen:      TxQueueLen,
		},
		Mode: mode,
	}
	if err := netlink.LinkAdd(ipvlan); err != nil {
		log.Warnf("Failed to create the netlink link: [ %v ] with the "+
			"error: %s Note: a parent index cannot be link to both ipvlan "+
			"and ipvlan simultaneously. A new parent index is required", ipvlan, err)
		log.Warnf("Also check `/var/run/docker/netns/` for orphaned links to unmount and delete, then restart the plugin")
		log.Warnf("Run this to clean orphaned links 'umount /var/run/docker/netns/* && rm /var/run/docker/netns/*'")
	}
	log.Infof("Created ipvlan link: [ %s ] with a mode: [ %s ]", ipvlan.Name, ipVlanMode)
	// Set the netlink iface MTU, default is 1500
	if err := netlink.LinkSetMTU(ipvlan, defaultMTU); err != nil {
		log.Errorf("Error setting the MTU [ %d ] for link [ %s ]: %s", defaultMTU, ipvlan.Name, err)
	}
	// Bring the netlink iface up
	if err := netlink.LinkSetUp(ipvlan); err != nil {
		log.Warnf("failed to enable the ipvlan netlink link: [ %v ]", ipvlan, err)
	}
	// SrcName gets renamed to DstPrefix on the container iface
	ifname := &InterfaceName{
		SrcName:   ipvlan.Name,
		DstPrefix: containerEthPrefix,
	}
	res := &joinResponse{}
	// L2 ipvlan needs an explicit IP for a default GW in the container netns
	if ipVlanMode == ipVlanL2 {
		res = &joinResponse{
			InterfaceName: *ifname,
			Gateway:       driver.pluginConfig.gatewayIP.String(),
		}
		defer objectResponse(w, res)
	}

	// ipvlan L3 mode doesnt need an IP for a default GW, just an iface dex.
	if ipVlanMode == ipVlanL3 || ipVlanMode == ipVlanL3Routing {
		res = &joinResponse{
			InterfaceName: *ifname,
		}
		// Add a default route of only the interface inside the container
		defaultRoute := &staticRoute{
			Destination: defaultRoute,
			RouteType:   types.CONNECTED,
			NextHop:     "",
		}
		res.StaticRoutes = []*staticRoute{defaultRoute}
	}
	log.Debugf("Join response: %+v", res)
	// Send the response to libnetwork
	objectResponse(w, res)
	log.Debugf("Join endpoint %s:%s to %s", j.NetworkID, j.EndpointID, j.SandboxKey)
}

//.........这里部分代码省略.........
		PeerName:  containerIfName}
	if err = netlink.LinkAdd(veth); err != nil {
		return types.InternalErrorf("failed to add the host (%s) <=> sandbox (%s) pair interfaces: %v", hostIfName, containerIfName, err)
	}

	// Get the host side pipe interface handler
	host, err := netlink.LinkByName(hostIfName)
	if err != nil {
		return types.InternalErrorf("failed to find host side interface %s: %v", hostIfName, err)
	}
	defer func() {
		if err != nil {
			netlink.LinkDel(host)
		}
	}()

	// Get the sandbox side pipe interface handler
	sbox, err := netlink.LinkByName(containerIfName)
	if err != nil {
		return types.InternalErrorf("failed to find sandbox side interface %s: %v", containerIfName, err)
	}
	defer func() {
		if err != nil {
			netlink.LinkDel(sbox)
		}
	}()

	n.Lock()
	config := n.config
	n.Unlock()

	// Add bridge inherited attributes to pipe interfaces
	if config.Mtu != 0 {
		err = netlink.LinkSetMTU(host, config.Mtu)
		if err != nil {
			return types.InternalErrorf("failed to set MTU on host interface %s: %v", hostIfName, err)
		}
		err = netlink.LinkSetMTU(sbox, config.Mtu)
		if err != nil {
			return types.InternalErrorf("failed to set MTU on sandbox interface %s: %v", containerIfName, err)
		}
	}

	// Attach host side pipe interface into the bridge
	if err = addToBridge(hostIfName, config.BridgeName); err != nil {
		return fmt.Errorf("adding interface %s to bridge %s failed: %v", hostIfName, config.BridgeName, err)
	}

	if !dconfig.EnableUserlandProxy {
		err = setHairpinMode(host, true)
		if err != nil {
			return err
		}
	}

	// Store the sandbox side pipe interface parameters
	endpoint.srcName = containerIfName
	endpoint.macAddress = ifInfo.MacAddress()
	endpoint.addr = ifInfo.Address()
	endpoint.addrv6 = ifInfo.AddressIPv6()

	// Set the sbox's MAC if not provided. If specified, use the one configured by user, otherwise generate one based on IP.
	if endpoint.macAddress == nil {
		endpoint.macAddress = electMacAddress(epConfig, endpoint.addr.IP)
		if err = ifInfo.SetMacAddress(endpoint.macAddress); err != nil {
			return err

func (driver *driver) joinEndpoint(w http.ResponseWriter, r *http.Request) {

	var j join
	if err := json.NewDecoder(r.Body).Decode(&j); err != nil {
		sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
		return
	}
	log.Debugf("Join request: %+v", &j)
	getID, err := driver.getNetwork(j.NetworkID)
	if err != nil {
		log.Errorf("error getting network ID mode [ %s ]: %v", j.NetworkID, err)
	}
	endID := j.EndpointID
	// unique name while still on the common netns
	preMoveName := endID[:5]
	res := &joinResponse{}
	mode, err := setVlanMode("bridge")
	if err != nil {
		log.Errorf("error getting vlan mode [ %v ]: %s", mode, err)
		return
	}
	if getID.ifaceOpt == "" {
		log.Error("Required macvlan parent interface is missing, please recreate the network specifying the host_iface")
		return
	}
	// Get the link for the master index (Example: the docker host eth iface)
	hostEth, err := netlink.LinkByName(getID.ifaceOpt)
	if err != nil {
		log.Warnf("Error looking up the parent iface [ %s ] error: [ %s ]", getID.ifaceOpt, err)
	}
	mvlan := &netlink.Macvlan{
		LinkAttrs: netlink.LinkAttrs{
			Name:        preMoveName,
			ParentIndex: hostEth.Attrs().Index,
		},
		Mode: mode,
	}
	if err := netlink.LinkAdd(mvlan); err != nil {
		log.Warnf("Failed to create the netlink link: [ %v ] with the "+
			"error: %s Note: a parent index cannot be link to both macvlan "+
			"and macvlan simultaneously. A new parent index is required", mvlan, err)
		log.Warnf("Also check `/var/run/docker/netns/` for orphaned links to unmount and delete, then restart the plugin")
		log.Warnf("Run this to clean orphaned links 'umount /var/run/docker/netns/* && rm /var/run/docker/netns/*'")
	}
	// Set the netlink iface MTU, default is 1500
	if err := netlink.LinkSetMTU(mvlan, defaultMTU); err != nil {
		log.Errorf("Error setting the MTU [ %d ] for link [ %s ]: %s", defaultMTU, mvlan.Name, err)
	}
	// Bring the netlink iface up
	if err := netlink.LinkSetUp(mvlan); err != nil {
		log.Warnf("failed to enable the macvlan netlink link: [ %v ]", mvlan, err)
	}
	// SrcName gets renamed to DstPrefix on the container iface
	ifname := &InterfaceName{
		SrcName:   mvlan.Name,
		DstPrefix: containerIfacePrefix,
	}

	res = &joinResponse{
		InterfaceName:         *ifname,
		Gateway:               getID.gateway,
		DisableGatewayService: true,
	}
	defer objectResponse(w, res)
	log.Debugf("Join response: %+v", res)
	// Send the response to libnetwork
	//	objectResponse(w, res)
	log.Debugf("Join endpoint %s:%s to %s", j.NetworkID, j.EndpointID, j.SandboxKey)
}

//.........这里部分代码省略.........

	// Generate and add the interface pipe host <-> sandbox
	veth := &netlink.Veth{
		LinkAttrs: netlink.LinkAttrs{Name: name1, TxQLen: 0},
		PeerName:  name2}
	if err = netlink.LinkAdd(veth); err != nil {
		return err
	}

	// Get the host side pipe interface handler
	host, err := netlink.LinkByName(name1)
	if err != nil {
		return err
	}
	defer func() {
		if err != nil {
			netlink.LinkDel(host)
		}
	}()

	// Get the sandbox side pipe interface handler
	sbox, err := netlink.LinkByName(name2)
	if err != nil {
		return err
	}
	defer func() {
		if err != nil {
			netlink.LinkDel(sbox)
		}
	}()

	// Add bridge inherited attributes to pipe interfaces
	if config.Mtu != 0 {
		err = netlink.LinkSetMTU(host, config.Mtu)
		if err != nil {
			return err
		}
		err = netlink.LinkSetMTU(sbox, config.Mtu)
		if err != nil {
			return err
		}
	}

	// Attach host side pipe interface into the bridge
	if err = netlink.LinkSetMaster(host,
		&netlink.Bridge{LinkAttrs: netlink.LinkAttrs{Name: config.BridgeName}}); err != nil {
		return err
	}

	if !config.EnableUserlandProxy {
		err = netlink.LinkSetHairpin(host, true)
		if err != nil {
			return err
		}
	}

	// v4 address for the sandbox side pipe interface
	ip4, err := ipAllocator.RequestIP(n.bridge.bridgeIPv4, nil)
	if err != nil {
		return err
	}
	ipv4Addr := &net.IPNet{IP: ip4, Mask: n.bridge.bridgeIPv4.Mask}

	// Set the sbox's MAC. If specified, use the one configured by user, otherwise generate one based on IP.
	mac := electMacAddress(epConfig, ip4)
	err = netlink.LinkSetHardwareAddr(sbox, mac)

func (v *veth) initialize(config *network) error {
	peer := config.TempVethPeerName
	if peer == "" {
		return fmt.Errorf("peer is not specified")
	}
	child, err := netlink.LinkByName(peer)
	if err != nil {
		return err
	}
	if err := netlink.LinkSetDown(child); err != nil {
		return err
	}
	if err := netlink.LinkSetName(child, config.Name); err != nil {
		return err
	}
	// get the interface again after we changed the name as the index also changes.
	if child, err = netlink.LinkByName(config.Name); err != nil {
		return err
	}
	if config.MacAddress != "" {
		mac, err := net.ParseMAC(config.MacAddress)
		if err != nil {
			return err
		}
		if err := netlink.LinkSetHardwareAddr(child, mac); err != nil {
			return err
		}
	}
	ip, err := netlink.ParseAddr(config.Address)
	if err != nil {
		return err
	}
	if err := netlink.AddrAdd(child, ip); err != nil {
		return err
	}
	if config.IPv6Address != "" {
		ip6, err := netlink.ParseAddr(config.IPv6Address)
		if err != nil {
			return err
		}
		if err := netlink.AddrAdd(child, ip6); err != nil {
			return err
		}
	}
	if err := netlink.LinkSetMTU(child, config.Mtu); err != nil {
		return err
	}
	if err := netlink.LinkSetUp(child); err != nil {
		return err
	}
	if config.Gateway != "" {
		gw := net.ParseIP(config.Gateway)
		if err := netlink.RouteAdd(&netlink.Route{
			Scope:     netlink.SCOPE_UNIVERSE,
			LinkIndex: child.Attrs().Index,
			Gw:        gw,
		}); err != nil {
			return err
		}
	}
	if config.IPv6Gateway != "" {
		gw := net.ParseIP(config.IPv6Gateway)
		if err := netlink.RouteAdd(&netlink.Route{
			Scope:     netlink.SCOPE_UNIVERSE,
			LinkIndex: child.Attrs().Index,
			Gw:        gw,
		}); err != nil {
			return err
		}
	}
	return nil
}

//.........这里部分代码省略.........
		PeerName:  containerIfName}
	if err = netlink.LinkAdd(veth); err != nil {
		return types.InternalErrorf("failed to add the host (%s) <=> sandbox (%s) pair interfaces: %v", hostIfName, containerIfName, err)
	}

	// Get the host side pipe interface handler
	host, err := netlink.LinkByName(hostIfName)
	if err != nil {
		return types.InternalErrorf("failed to find host side interface %s: %v", hostIfName, err)
	}
	defer func() {
		if err != nil {
			netlink.LinkDel(host)
		}
	}()

	// Get the sandbox side pipe interface handler
	sbox, err := netlink.LinkByName(containerIfName)
	if err != nil {
		return types.InternalErrorf("failed to find sandbox side interface %s: %v", containerIfName, err)
	}
	defer func() {
		if err != nil {
			netlink.LinkDel(sbox)
		}
	}()

	n.Lock()
	config := n.config
	n.Unlock()

	// Add bridge inherited attributes to pipe interfaces
	if config.Mtu != 0 {
		err = netlink.LinkSetMTU(host, config.Mtu)
		if err != nil {
			return types.InternalErrorf("failed to set MTU on host interface %s: %v", hostIfName, err)
		}
		err = netlink.LinkSetMTU(sbox, config.Mtu)
		if err != nil {
			return types.InternalErrorf("failed to set MTU on sandbox interface %s: %v", containerIfName, err)
		}
	}

	// Attach host side pipe interface into the bridge
	if err = addToBridge(hostIfName, config.BridgeName); err != nil {
		return fmt.Errorf("adding interface %s to bridge %s failed: %v", hostIfName, config.BridgeName, err)
	}

	if !dconfig.EnableUserlandProxy {
		err = setHairpinMode(host, true)
		if err != nil {
			return err
		}
	}

	// Create the sandbox side pipe interface
	endpoint.srcName = containerIfName
	endpoint.macAddress = ifInfo.MacAddress()
	endpoint.addr = ifInfo.Address()
	endpoint.addrv6 = ifInfo.AddressIPv6()

	// Down the interface before configuring mac address.
	if err = netlink.LinkSetDown(sbox); err != nil {
		return fmt.Errorf("could not set link down for container interface %s: %v", containerIfName, err)
	}

func applyInterfaceConfig(link netlink.Link, netConf InterfaceConfig) error {
	if netConf.Bond != "" {
		if err := netlink.LinkSetDown(link); err != nil {
			return err
		}

		b, err := Bond(netConf.Bond)
		if err != nil {
			return err
		}
		if err := b.AddSlave(link.Attrs().Name); err != nil {
			return err
		}
		return nil
	}

	if netConf.Bridge != "" && netConf.Bridge != "true" {
		b, err := NewBridge(netConf.Bridge)
		if err != nil {
			return err
		}
		if err := b.AddLink(link); err != nil {
			return err
		}
		return linkUp(link, netConf)
	}

	if netConf.IPV4LL {
		if err := AssignLinkLocalIP(link); err != nil {
			log.Errorf("IPV4LL set failed: %v", err)
			return err
		}
	} else {
		addresses := []string{}

		if netConf.Address != "" {
			addresses = append(addresses, netConf.Address)
		}

		if len(netConf.Addresses) > 0 {
			addresses = append(addresses, netConf.Addresses...)
		}

		for _, address := range addresses {
			err := applyAddress(address, link, netConf)
			if err != nil {
				log.Errorf("Failed to apply address %s to %s: %v", address, link.Attrs().Name, err)
			}
		}
	}

	if netConf.MTU > 0 {
		if err := netlink.LinkSetMTU(link, netConf.MTU); err != nil {
			log.Errorf("set MTU Failed: %v", err)
			return err
		}
	}

	runCmds(netConf.PreUp, link.Attrs().Name)

	if err := linkUp(link, netConf); err != nil {
		return err
	}

	if err := setGateway(netConf.Gateway); err != nil {
		log.Errorf("Fail to set gateway %s", netConf.Gateway)
	}

	if err := setGateway(netConf.GatewayIpv6); err != nil {
		log.Errorf("Fail to set gateway %s", netConf.GatewayIpv6)
	}

	runCmds(netConf.PostUp, link.Attrs().Name)

	return nil
}

// configureInterface is used to configure an individual interface against a
// matched configuration. It sets up the addresses, the MTU, and invokes DHCP if
// necessary.
func configureInterface(link netlink.Link, netconf *kurmaNetworkInterface) error {
	linkName := link.Attrs().Name
	addressConfigured := true

	// configure using DHCP
	if netconf.DHCP {
		cmd := exec.Command("udhcpc", "-i", linkName, "-t", "20", "-n")
		cmd.Stdin = nil
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
		if err := cmd.Run(); err != nil {
			return fmt.Errorf("failed to configure %s with DHCP: %v", linkName, err)
		}
		addressConfigured = true
	}

	// single address
	if netconf.Address != "" {
		addr, err := netlink.ParseAddr(netconf.Address)
		if err != nil {
			return fmt.Errorf("failed to parse address %q on %s", netconf.Address, linkName)
		}
		if err := netlink.AddrAdd(link, addr); err != nil {
			return fmt.Errorf("failed to configure address %q on %s: %v",
				netconf.Address, linkName, err)
		}
		addressConfigured = true
	}

	// list of addresses
	for _, address := range netconf.Addresses {
		addr, err := netlink.ParseAddr(address)
		if err != nil {
			return fmt.Errorf("failed to parse address %q on %s", address, linkName)
		}
		if err := netlink.AddrAdd(link, addr); err != nil {
			return fmt.Errorf("failed to configure address %q on %s: %v",
				address, linkName, err)
		}
		addressConfigured = true
	}

	if !addressConfigured {
		return fmt.Errorf("no address configured to %s: unable to set link up", linkName)
	}

	if netconf.MTU > 0 {
		if err := netlink.LinkSetMTU(link, netconf.MTU); err != nil {
			return fmt.Errorf("failed to set mtu on %s: %v", linkName, err)
		}
	}

	// verify it is up at the end
	if link.Attrs().Flags&net.FlagUp == 0 {
		if err := netlink.LinkSetUp(link); err != nil {
			return fmt.Errorf("failed to set link %s up: %v", linkName, err)
		}
	}

	return nil
}

func (e *endpoints) create(eid string, ifInfo *driverapi.EndpointInterface, niConfig networkConfig) (err error) {
	ep := endpoint{}

	// Generate a name for what will be the host side pipe interface
	hostIfName, err := netutils.GenerateIfaceName(vethPrefix, vethLen)
	if err != nil {
		return err
	}

	// Generate a name for what will be the sandbox side pipe interface
	containerIfName, err := netutils.GenerateIfaceName(vethPrefix, vethLen)
	if err != nil {
		return err
	}

	// Generate and add the interface pipe host <-> sandbox
	veth := &netlink.Veth{
		LinkAttrs: netlink.LinkAttrs{Name: hostIfName, TxQLen: 0},
		PeerName:  containerIfName,
	}
	if err = netlink.LinkAdd(veth); err != nil {
		return types.InternalErrorf("failed to add the host (%s) <=> sandbox (%s) pair interfaces: %v", hostIfName, containerIfName, err)
	}

	// Get the host side pipe interface handler
	host, err := netlink.LinkByName(hostIfName)
	if err != nil {
		return types.InternalErrorf("failed to find host side interface %s: %v", hostIfName, err)
	}
	defer func() {
		if err != nil {
			netlink.LinkDel(host)
		}
	}()

	// Get the sandbox side pipe interface handler
	sbox, err := netlink.LinkByName(containerIfName)
	if err != nil {
		return types.InternalErrorf("failed to find sandbox side interface %s: %v", containerIfName, err)
	}
	defer func() {
		if err != nil {
			netlink.LinkDel(sbox)
		}
	}()

	// Add bridge inherited attributes to pipe interfaces
	if niConfig.Mtu != 0 {
		err = netlink.LinkSetMTU(host, niConfig.Mtu)
		if err != nil {
			return types.InternalErrorf("failed to set MTU on host interface %s: %v", hostIfName, err)
		}
		err = netlink.LinkSetMTU(sbox, niConfig.Mtu)
		if err != nil {
			return types.InternalErrorf("failed to set MTU on sandbox interface %s: %v", containerIfName, err)
		}
	}

	// Attach host side pipe interface into the bridge
	br, err := netlink.LinkByName(niConfig.BridgeName)
	if err != nil {
		return types.InternalErrorf("failed to find bridge by name %s: %v", niConfig.BridgeName, err)
	}
	if err = netlink.LinkSetMaster(host, br.(*netlink.Bridge)); err != nil {
		return fmt.Errorf("adding interface %s to bridge %s failed: %v",