Beispiel #1
0
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{ipn.ToIPNet(), ""})
	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
}
Beispiel #2
0
func ensureLink(vxlan *netlink.Vxlan) (*netlink.Vxlan, error) {
	err := netlink.LinkAdd(vxlan)
	if err == syscall.EEXIST {
		// it's ok if the device already exists as long as config is similar
		existing, err := netlink.LinkByName(vxlan.Name)
		if err != nil {
			return nil, err
		}

		incompat := vxlanLinksIncompat(vxlan, existing)
		if incompat == "" {
			return existing.(*netlink.Vxlan), nil
		}

		// delete existing
		log.Warningf("%q already exists with incompatable configuration: %v; recreating device", vxlan.Name, incompat)
		if err = netlink.LinkDel(existing); err != nil {
			return nil, fmt.Errorf("failed to delete interface: %v", err)
		}

		// create new
		if err = netlink.LinkAdd(vxlan); err != nil {
			return nil, fmt.Errorf("failed to create vxlan interface: %v", err)
		}
	} else if err != nil {
		return nil, err
	}

	ifindex := vxlan.Index
	link, err := netlink.LinkByIndex(vxlan.Index)
	if err != nil {
		return nil, fmt.Errorf("can't locate created vxlan device with index %v", ifindex)
	}
	var ok bool
	if vxlan, ok = link.(*netlink.Vxlan); !ok {
		return nil, fmt.Errorf("created vxlan device with index %v is not vxlan", ifindex)
	}

	return vxlan, nil
}