예제 #1
0
파일: kvm.go 프로젝트: matomesc/rkt
func removeAllRoutesOnLink(link netlink.Link) error {
	routes, err := netlink.RouteList(link, netlink.FAMILY_V4)
	if err != nil {
		return fmt.Errorf("cannot list routes on link %q: %v", link.Attrs().Name, err)
	}

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

	return nil
}
예제 #2
0
파일: ptp.go 프로젝트: matomesc/rkt
func setupContainerVeth(netns, ifName string, mtu int, pr *types.Result) (string, error) {
	// The IPAM result will be something like IP=192.168.3.5/24, GW=192.168.3.1.
	// What we want is really a point-to-point link but veth does not support IFF_POINTOPONT.
	// Next best thing would be to let it ARP but set interface to 192.168.3.5/32 and
	// add a route like "192.168.3.0/24 via 192.168.3.1 dev $ifName".
	// Unfortunately that won't work as the GW will be outside the interface's subnet.

	// Our solution is to configure the interface with 192.168.3.5/24, then delete the
	// "192.168.3.0/24 dev $ifName" route that was automatically added. Then we add
	// "192.168.3.1/32 dev $ifName" and "192.168.3.0/24 via 192.168.3.1 dev $ifName".
	// In other words we force all traffic to ARP via the gateway except for GW itself.

	var hostVethName string
	err := ns.WithNetNSPath(netns, false, func(hostNS *os.File) error {
		hostVeth, _, err := ip.SetupVeth(ifName, mtu, hostNS)
		if err != nil {
			return err
		}

		if err = ipam.ConfigureIface(ifName, pr); err != nil {
			return err
		}

		contVeth, err := netlink.LinkByName(ifName)
		if err != nil {
			return fmt.Errorf("failed to look up %q: %v", ifName, err)
		}

		// Delete the route that was automatically added
		route := netlink.Route{
			LinkIndex: contVeth.Attrs().Index,
			Dst: &net.IPNet{
				IP:   pr.IP4.IP.IP.Mask(pr.IP4.IP.Mask),
				Mask: pr.IP4.IP.Mask,
			},
			Scope: netlink.SCOPE_NOWHERE,
		}

		if err := netlink.RouteDel(&route); err != nil {
			return fmt.Errorf("failed to delete route %v: %v", route, err)
		}

		for _, r := range []netlink.Route{
			netlink.Route{
				LinkIndex: contVeth.Attrs().Index,
				Dst: &net.IPNet{
					IP:   pr.IP4.Gateway,
					Mask: net.CIDRMask(32, 32),
				},
				Scope: netlink.SCOPE_LINK,
				Src:   pr.IP4.IP.IP,
			},
			netlink.Route{
				LinkIndex: contVeth.Attrs().Index,
				Dst: &net.IPNet{
					IP:   pr.IP4.IP.IP.Mask(pr.IP4.IP.Mask),
					Mask: pr.IP4.IP.Mask,
				},
				Scope: netlink.SCOPE_UNIVERSE,
				Gw:    pr.IP4.Gateway,
				Src:   pr.IP4.IP.IP,
			},
		} {
			if err := netlink.RouteAdd(&r); err != nil {
				return fmt.Errorf("failed to add route %v: %v", r, err)
			}
		}

		hostVethName = hostVeth.Attrs().Name

		return nil
	})
	return hostVethName, err
}