FLOW_DIS_TUN_OPTS_MAX
u8 data[FLOW_DIS_TUN_OPTS_MAX]; /* Using IP_TUNNEL_OPTS_MAX is desired
if (key->enc_opts.len > FLOW_DIS_TUN_OPTS_MAX - 4)
BUILD_BUG_ON(FLOW_DIS_TUN_OPTS_MAX != IP_TUNNEL_OPTS_MAX);
if (new_len > FLOW_DIS_TUN_OPTS_MAX) {