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* Drop the segment if it does not contain an ACK.		* Drop the segment if it does not contain an ACK.
*/		*/
if ((thflags & TH_ACK) == 0)		if ((thflags & TH_ACK) == 0)
goto drop;		goto drop;

/*		/*
* If timestamps were negotiated during SYN/ACK and a		* If timestamps were negotiated during SYN/ACK and a
* segment without a timestamp is received, silently drop		* segment without a timestamp is received, silently drop
* the segment.		* the segment, unless the missing timestamps are tolerated.
* See section 3.2 of RFC 7323.		* See section 3.2 of RFC 7323.
*/		*/
if (((to->to_flags & TOF_TS) == 0) && (tw->t_recent != 0)) {		if (((to->to_flags & TOF_TS) == 0) && (tw->t_recent != 0) &&
		(V_tcp_tolerate_missing_ts == 0)) {
goto drop;		goto drop;
}		}

/*		/*
* Reset the 2MSL timer if this is a duplicate FIN.		* Reset the 2MSL timer if this is a duplicate FIN.
*/		*/
if (thflags & TH_FIN) {		if (thflags & TH_FIN) {
seq = th->th_seq + tlen + (thflags & TH_SYN ? 1 : 0);		seq = th->th_seq + tlen + (thflags & TH_SYN ? 1 : 0);
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