TCPS_LISTEN
if (tdb == NULL && tp->t_state == TCPS_LISTEN)
if (tp->sack_enable && tp->t_state != TCPS_LISTEN) {
tb.t_state = TCPS_LISTEN;
if (tp->t_state == TCPS_LISTEN)
case TCPS_LISTEN:
tp->t_state = TCPS_LISTEN;
if (!(aflag || lflag) && istcp && kf->t_state <= TCPS_LISTEN)
kf->t_state != TCPS_LISTEN)