_, err := h.LinkByName(devName)
	if err == nil {
		// found dummy device
		return true, nil
	}
	dummy := &netlink.Dummy{
		LinkAttrs: netlink.LinkAttrs{Name: devName},
	}
	return false, h.LinkAdd(dummy)
}

// DeleteDummyDevice is part of interface.
func (h *netlinkHandle) DeleteDummyDevice(devName string) error {
	link, err := h.LinkByName(devName)
	if err != nil {

func configureTProxyRoutes(cfg *config.Config) error {
	if cfg.InboundPortsInclude != "" {
		if cfg.InboundInterceptionMode == constants.TPROXY {
			link, err := netlink.LinkByName("lo")
			if err != nil {
				return fmt.Errorf("failed to find 'lo' link: %v", err)
			}
			tproxyTable, err := strconv.Atoi(cfg.InboundTProxyRouteTable)
			if err != nil {

}

func DelLoopbackRoutes(cfg *Config) error {
	return forEachLoopbackRoute(cfg, netlink.RouteDel)
}

func forEachLoopbackRoute(cfg *Config, f func(*netlink.Route) error) error {
	loopbackLink, err := netlink.LinkByName("lo")
	if err != nil {
		return fmt.Errorf("failed to find 'lo' link: %v", err)
	}

	// Set up netlink routes for localhost
	cidrs := []string{"0.0.0.0/0"}
	if cfg.EnableIPv6 {
		cidrs = append(cidrs, "0::0/0")

// Equivalent to `ip -6 addr add "::6/128" dev lo`
func configureIPv6Addresses(cfg *config.Config) error {
	if !cfg.EnableIPv6 {
		return nil
	}
	link, err := netlink.LinkByName("lo")
	if err != nil {
		return fmt.Errorf("failed to find 'lo' link: %v", err)
	}
	// Setup a new IP address on local interface. This is used as the source IP for inbound traffic