Golang netlink.RouteDel函數代碼示例

// delRouteIface clean up the required L3 mode default ns route
func delRouteIface(ipVlanL3Network *net.IPNet, iface netlink.Link) error {
	return netlink.RouteDel(&netlink.Route{
		LinkIndex: iface.Attrs().Index,
		Scope:     netlink.SCOPE_LINK,
		Dst:       ipVlanL3Network,
	})
}

// delRemoteRoute deletes a host-scoped route to a device.
func delRemoteRoute(neighborNetwork *net.IPNet, nextHop net.IP, iface netlink.Link) error {
	return netlink.RouteDel(&netlink.Route{
		Scope:     netlink.SCOPE_UNIVERSE,
		LinkIndex: iface.Attrs().Index,
		Dst:       neighborNetwork,
		Gw:        nextHop,
	})
}

// delRoute deletes any netlink route
func delRoute(route netlink.Route, iface netlink.Link) error {
	return netlink.RouteDel(&netlink.Route{
		Scope:     route.Scope,
		LinkIndex: iface.Attrs().Index,
		Dst:       route.Dst,
		Gw:        route.Gw,
	})
}

func (dev *vxlanDevice) DelRoute(subnet ip.IP4Net) error {
	route := &netlink.Route{
		Scope: netlink.SCOPE_UNIVERSE,
		Dst:   subnet.ToIPNet(),
		Gw:    subnet.IP.ToIP(),
	}
	log.Infof("calling RouteDel: %s", subnet)
	return netlink.RouteDel(route)
}

// delRemoteRoute deletes a host-scoped route to a device.
func delRemoteRoute(neighborNetwork *net.IPNet, nextHop net.IP, iface netlink.Link) error {
	log.Debugf("Deleting route: IP Prefix: [ %s ] - Next Hop: [ %s ] - Source Interface: [ %s ]", neighborNetwork, nextHop, iface.Attrs().Name)
	return netlink.RouteDel(&netlink.Route{
		Scope:     netlink.SCOPE_UNIVERSE,
		LinkIndex: iface.Attrs().Index,
		Dst:       neighborNetwork,
		Gw:        nextHop,
	})
}

// delRoute deletes any netlink route
func delRoute(route netlink.Route, iface netlink.Link) error {
	log.Debugf("Deleting route in the default namespace for IPVlan L3 mode with the following:")
	log.Debugf("IP Prefix: [ %s ] - Next Hop: [ %s ] - Source Interface: [ %s ]", route.Dst, route.Gw, iface.Attrs().Name)

	return netlink.RouteDel(&netlink.Route{
		Scope:     route.Scope,
		LinkIndex: iface.Attrs().Index,
		Dst:       route.Dst,
		Gw:        route.Gw,
	})
}

func (t *AWSVPCTracker) deleteHostRoute(cidr string) error {
	dst, err := parseCIDR(cidr)
	if err != nil {
		return err
	}
	route := &netlink.Route{
		LinkIndex: t.linkIndex,
		Dst:       dst,
		Scope:     netlink.SCOPE_LINK,
	}
	return netlink.RouteDel(route)
}

//delete default routes
//FIXME all default routes will be erased
func delDefaultRoute() error {
	routes, _ := netlink.RouteList(nil, netlink.FAMILY_V4)

	for _, route := range routes {
		if route.Dst != nil || route.Src != nil {
			continue
		}
		if err := netlink.RouteDel(&route); err != nil {
			return err
		}
	}
	return nil
}

// AddHostRoute adds a route to a device using netlink into the Linux default namespace.
func delNetlinkRoute(neighborNetwork *net.IPNet, nextHop net.IP, netIface string) error {
	iface, err := netlink.LinkByName(netIface)
	if err != nil {
		return err
	}
	log.Infof("IP Prefix: [ %s ] - Next Hop: [ %s ] - Source Interface: [ %s ]", neighborNetwork, nextHop, iface.Attrs().Name)
	return netlink.RouteDel(&netlink.Route{
		Scope:     netlink.SCOPE_UNIVERSE,
		LinkIndex: iface.Attrs().Index,
		Dst:       neighborNetwork,
		Gw:        nextHop,
	})
}

func removeAllRoutesOnLink(link netlink.Link) error {
	routes, err := netlink.RouteList(link, netlink.FAMILY_V4)
	if err != nil {
		return errwrap.Wrap(fmt.Errorf("cannot list routes on link %q", link.Attrs().Name), err)
	}

	for _, route := range routes {
		if err := netlink.RouteDel(&route); err != nil {
			return errwrap.Wrap(fmt.Errorf("error in time of route removal for route %q", route), err)
		}
	}

	return nil
}

// Delete a route from the namespace routing table.
func removeRoute(path string, dest *net.IPNet, nh net.IP) error {
	return nsInvoke(path, func(nsFD int) error { return nil }, func(callerFD int) error {
		gwRoutes, err := netlink.RouteGet(nh)
		if err != nil {
			return fmt.Errorf("route for the next hop could not be found: %v", err)
		}

		return netlink.RouteDel(&netlink.Route{
			Scope:     netlink.SCOPE_UNIVERSE,
			LinkIndex: gwRoutes[0].LinkIndex,
			Gw:        gwRoutes[0].Gw,
			Dst:       dest,
		})
	})
}

func delAllRoutesVia(s net.Addr) error {
	src := s.(*net.TCPAddr).IP

	routes, err := netlink.RouteList(nil, netlink.FAMILY_ALL)
	if err != nil {
		log.Error("Failed to get routes")
		log.Error(err)
		return err
	}
	for _, r := range routes {
		if r.Gw.Equal(src) {
			netlink.RouteDel(&r)
		}
	}
	return nil
}

func (rb *HostgwBackend) handleSubnetEvents(batch subnet.EventBatch) {
	for _, evt := range batch {
		switch evt.Type {
		case subnet.SubnetAdded:
			log.Infof("Subnet added: %v via %v", evt.Lease.Network, evt.Lease.Attrs.PublicIP)

			if evt.Lease.Attrs.BackendType != "host-gw" {
				log.Warningf("Ignoring non-host-gw subnet: type=%v", evt.Lease.Attrs.BackendType)
				continue
			}

			route := netlink.Route{
				Dst:       evt.Lease.Network.ToIPNet(),
				Gw:        evt.Lease.Attrs.PublicIP.ToIP(),
				LinkIndex: rb.extIface.Index,
			}
			if err := netlink.RouteAdd(&route); err != nil {
				log.Errorf("Error adding route to %v via %v: %v", evt.Lease.Network, evt.Lease.Attrs.PublicIP, err)
				continue
			}

		case subnet.SubnetRemoved:
			log.Info("Subnet removed: ", evt.Lease.Network)

			if evt.Lease.Attrs.BackendType != "host-gw" {
				log.Warningf("Ignoring non-host-gw subnet: type=%v", evt.Lease.Attrs.BackendType)
				continue
			}

			route := netlink.Route{
				Dst:       evt.Lease.Network.ToIPNet(),
				Gw:        evt.Lease.Attrs.PublicIP.ToIP(),
				LinkIndex: rb.extIface.Index,
			}
			if err := netlink.RouteDel(&route); err != nil {
				log.Errorf("Error deleting route to %v: %v", evt.Lease.Network, err)
				continue
			}

		default:
			log.Error("Internal error: unknown event type: ", int(evt.Type))
		}
	}
}

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

	routes := createRoutes(veth)

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

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

func programGateway(path string, gw net.IP, isAdd bool) error {
	return nsInvoke(path, func(nsFD int) error { return nil }, func(callerFD int) error {
		gwRoutes, err := netlink.RouteGet(gw)
		if err != nil {
			return fmt.Errorf("route for the gateway could not be found: %v", err)
		}

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

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