IP6GRE_TUNL_DEV1
err = add_ipv6_tunnel(IP6GRE_TUNL_DEV0, IP6GRE_TUNL_DEV1,
err = add_ipv6_tunnel(IP6GRE_TUNL_DEV0, IP6GRE_TUNL_DEV1,
if (tc_prog_attach(IP6GRE_TUNL_DEV1, get_fd, set_fd))
delete_tunnel(IP6GRE_TUNL_DEV0, IP6GRE_TUNL_DEV1);