TUN_IFHEAD
if (cached_tun_flags & TUN_IFHEAD) {
tp->tun_flags &= ~TUN_IFHEAD;
tp->tun_flags |= TUN_IFHEAD;
tp->tun_flags &= ~TUN_IFHEAD;
*(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0;
if (tp->tun_flags & TUN_IFHEAD) {
} else if ((tp->tun_flags & TUN_IFHEAD) != 0)