Golang netlink.RouteAdd函数代码示例

func addIPConfigToLink(ipConfig *ipam.IPConfig, link netlink.Link, ifName string) error {
	log.Debugf("Configuring link %+v/%s with %+v", link, ifName, ipConfig)

	addr := &netlink.Addr{IPNet: &ipConfig.IP}
	if err := netlink.AddrAdd(link, addr); err != nil {
		return fmt.Errorf("failed to add addr to %q: %v", ifName, err)
	}

	// Sort provided routes to make sure we apply any more specific
	// routes first which may be used as nexthops in wider routes
	sort.Sort(ipam.ByMask(ipConfig.Routes))

	for _, r := range ipConfig.Routes {
		log.Debugf("Adding route %+v", r)
		rt := &netlink.Route{
			LinkIndex: link.Attrs().Index,
			Scope:     netlink.SCOPE_UNIVERSE,
			Dst:       &r.Destination,
			Gw:        r.NextHop,
		}

		if r.IsL2() {
			rt.Scope = netlink.SCOPE_LINK
		}

		if err := netlink.RouteAdd(rt); err != nil {
			if !os.IsExist(err) {
				return fmt.Errorf("failed to add route '%s via %v dev %v': %v",
					r.Destination.String(), r.NextHop, ifName, err)
			}
		}
	}

	return nil
}

func setGateway(gateway string) error {
	if gateway == "" {
		return nil
	}

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

	route := netlink.Route{
		Scope: netlink.SCOPE_UNIVERSE,
		Gw:    gatewayIp,
	}

	if err := netlink.RouteAdd(&route); err == syscall.EEXIST {
		//Ignore this error
	} else if err != nil {
		log.Errorf("gateway set failed: %v", err)
		return err
	}

	log.Infof("Set default gateway %s", gateway)
	return nil
}

func (n *network) checkSubnetExistInRoutes() {
	routeList, err := netlink.RouteList(nil, netlink.FAMILY_V4)
	if err == nil {
		for _, route := range n.rl {
			exist := false
			for _, r := range routeList {
				if r.Dst == nil {
					continue
				}
				if routeEqual(r, route) {
					exist = true
					break
				}
			}
			if !exist {
				if err := netlink.RouteAdd(&route); err != nil {
					if nerr, ok := err.(net.Error); !ok {
						log.Errorf("Error recovering route to %v: %v, %v", route.Dst, route.Gw, nerr)
					}
					continue
				} else {
					log.Infof("Route recovered %v : %v", route.Dst, route.Gw)
				}
			}
		}
	}
}

func setupRoute(config *configs.Config) error {
	for _, config := range config.Routes {
		_, dst, err := net.ParseCIDR(config.Destination)
		if err != nil {
			return err
		}
		src := net.ParseIP(config.Source)
		if src == nil {
			return fmt.Errorf("Invalid source for route: %s", config.Source)
		}
		gw := net.ParseIP(config.Gateway)
		if gw == nil {
			return fmt.Errorf("Invalid gateway for route: %s", config.Gateway)
		}
		l, err := netlink.LinkByName(config.InterfaceName)
		if err != nil {
			return err
		}
		route := &netlink.Route{
			Scope:     netlink.SCOPE_UNIVERSE,
			Dst:       dst,
			Src:       src,
			Gw:        gw,
			LinkIndex: l.Attrs().Index,
		}
		if err := netlink.RouteAdd(route); err != nil {
			return err
		}
	}
	return nil
}

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
}

func (d *driver) createNetwork(w http.ResponseWriter, r *http.Request) {
	var req createNetworkRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		panic(err)
	}

	if len(d.networkID) != 0 {
		panic(fmt.Errorf("driver already has a network defined"))
	}

	route := &netlink.Route{
		LinkIndex: d.hostLink.Attrs().Index,
		Scope:     netlink.SCOPE_LINK,
		Dst:       d.ipnet,
	}
	if err := netlink.RouteAdd(route); err != nil {
		Warn.Printf("error adding link-scope route: %s\n", err)
	}

	d.networkID = req.NetworkID
	Debug.Println("driver.createNetwork", req.NetworkID, req.Options)

	w.Header().Set("Content-Type", "application/json")
	fmt.Fprint(w, `{}`)
}

// addRouteIface required for L3 mode adds a link scoped route in the default ns
func addRouteIface(ipVlanL3Network *net.IPNet, iface netlink.Link) error {
	return netlink.RouteAdd(&netlink.Route{
		LinkIndex: iface.Attrs().Index,
		Scope:     netlink.SCOPE_LINK,
		Dst:       ipVlanL3Network,
	})
}

func programGateway(path string, gw net.IP) error {
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	origns, err := netns.Get()
	if err != nil {
		return err
	}
	defer origns.Close()

	f, err := os.OpenFile(path, os.O_RDONLY, 0)
	if err != nil {
		return fmt.Errorf("failed get network namespace %q: %v", path, err)
	}
	defer f.Close()

	nsFD := f.Fd()
	if err = netns.Set(netns.NsHandle(nsFD)); err != nil {
		return err
	}
	defer netns.Set(origns)

	gwRoutes, err := netlink.RouteGet(gw)
	if err != nil {
		return fmt.Errorf("route for the gateway could not be found: %v", err)
	}

	return netlink.RouteAdd(&netlink.Route{
		Scope:     netlink.SCOPE_UNIVERSE,
		LinkIndex: gwRoutes[0].LinkIndex,
		Gw:        gw,
	})
}

func routingUp() {
	veth, err := netlink.LinkByName("myveth1")
	if err != nil {
		panic(err)
	}

	err = netlink.LinkSetUp(veth)
	if err != nil {
		panic(err)
	}

	addr, _ := netlink.ParseAddr("172.19.80.2/24")
	err = netlink.AddrAdd(veth, addr)
	if err != nil {
		panic(err)
	}

	routes := createRoutes(veth)

	for _, route := range routes {
		fmt.Println("Adding route", route)
		err := netlink.RouteAdd(route)
		if err != nil {
			fmt.Println(err)
			// panic(err)
		}
	}
}

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
}

// AddHostRoute adds a host-scoped route to a device.
func AddHostRoute(ipn *net.IPNet, gw net.IP, dev netlink.Link) error {
	return netlink.RouteAdd(&netlink.Route{
		LinkIndex: dev.Attrs().Index,
		Scope:     netlink.SCOPE_HOST,
		Dst:       ipn,
		Gw:        gw,
	})
}

func (dev *vxlanDevice) AddRoute(subnet ip.IP4Net) error {
	route := &netlink.Route{
		Scope: netlink.SCOPE_UNIVERSE,
		Dst:   subnet.ToIPNet(),
		Gw:    subnet.IP.ToIP(),
	}

	log.Infof("calling RouteAdd: %s", subnet)
	return netlink.RouteAdd(route)
}

func addRoute(link netlink.Link, podIP net.IP) error {
	route := netlink.Route{
		LinkIndex: link.Attrs().Index,
		Scope:     netlink.SCOPE_LINK,
		Dst: &net.IPNet{
			IP:   podIP,
			Mask: net.IPv4Mask(0xff, 0xff, 0xff, 0xff),
		},
	}
	return netlink.RouteAdd(&route)
}

func routeAdd(ip *net.IPNet, iface netlink.Link) error {
	route := netlink.Route{
		LinkIndex: iface.Attrs().Index,
		Dst:       ip,
	}
	log.Debugf("Adding route %+v", route)
	if err := netlink.RouteAdd(&route); err != nil {
		log.Errorf("Unable to add route %+v: %+v", route, err)
	}
	return nil
}

func AddDefaultGateway(ip string) error {
	err := netlink.RouteAdd(&netlink.Route{
		Scope: netlink.SCOPE_UNIVERSE,
		Gw:    net.ParseIP(ip),
	})
	if err != nil {
		log.Errorf("Adding Default Gateway: %s", ip)
		return err
	}
	return nil
}