TUN_METADATA_OPTS
ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len),
opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len);
option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len);
TUN_METADATA_OPTS(&key, key.tun_opts_len),