Exemple #1
0
func cmdAdd(args *skel.CmdArgs) error {
	n, err := loadConf(args.StdinData)
	if err != nil {
		return err
	}

	netns, err := os.Open(args.Netns)
	if err != nil {
		return fmt.Errorf("failed to open netns %q: %v", netns, err)
	}
	defer netns.Close()

	tmpName, err := ip.RandomVethName()
	if err != nil {
		return err
	}

	if err = createIpvlan(n, tmpName, netns); err != nil {
		return err
	}

	// run the IPAM plugin and get back the config to apply
	result, err := plugin.ExecAdd(n.IPAM.Type, args.StdinData)
	if err != nil {
		return err
	}
	if result.IP4 == nil {
		return errors.New("IPAM plugin returned missing IPv4 config")
	}

	err = ns.WithNetNS(netns, func(_ *os.File) error {
		err := renameLink(tmpName, args.IfName)
		if err != nil {
			return fmt.Errorf("failed to rename ipvlan to %q: %v", args.IfName, err)
		}

		return plugin.ConfigureIface(args.IfName, result)
	})
	if err != nil {
		return err
	}

	if n.IPMasq {
		chain := "CNI-" + n.Name
		if err = ip.SetupIPMasq(ip.Network(&result.IP4.IP), chain); err != nil {
			return err
		}
	}

	return plugin.PrintResult(result)
}
Exemple #2
0
func createMacvlan(conf *NetConf, ifName string, netns *os.File) error {
	mode, err := modeFromString(conf.Mode)
	if err != nil {
		return err
	}

	m, err := netlink.LinkByName(conf.Master)
	if err != nil {
		return fmt.Errorf("failed to lookup master %q: %v", conf.Master, err)
	}

	// due to kernel bug we have to create with tmpname or it might
	// collide with the name on the host and error out
	tmpName, err := ip.RandomVethName()
	if err != nil {
		return err
	}

	mv := &netlink.Macvlan{
		LinkAttrs: netlink.LinkAttrs{
			MTU:         conf.MTU,
			Name:        tmpName,
			ParentIndex: m.Attrs().Index,
			Namespace:   netlink.NsFd(int(netns.Fd())),
		},
		Mode: mode,
	}

	if err := netlink.LinkAdd(mv); err != nil {
		return fmt.Errorf("failed to create macvlan: %v", err)
	}

	return ns.WithNetNS(netns, false, func(_ *os.File) error {
		err := renameLink(tmpName, ifName)
		if err != nil {
			return fmt.Errorf("failed to rename macvlan to %q: %v", ifName, err)
		}
		return nil
	})
}