TF_SACK_PERMIT
tp->sack_enable = tp->t_flags & TF_SACK_PERMIT;
tp->t_flags |= TF_SACK_PERMIT;
tp->t_flags |= TF_SACK_PERMIT;
if (tb.sack_enable && (tb.t_flags & TF_SACK_PERMIT))
(tp->t_flags & TF_SACK_PERMIT))) {
(tp->t_flags & (TF_SACK_PERMIT|TF_NOOPT)) == TF_SACK_PERMIT &&
if (tp->t_flags & TF_SACK_PERMIT)