TOF_SACK
(TOF_SACK | TOF_SACK_REDUNDANT))
!= TOF_SACK) {
to->to_flags |= TOF_SACK;
to->to_flags &= ~TOF_SACK;
if ((to->to_flags & TOF_SACK) &&
(to_flags & (TOF_SACK | TOF_SACK_REDUNDANT)) ==
TOF_SACK) {