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*/		*/
tcp_dooptions(&to, (u_char *)(th + 1),		tcp_dooptions(&to, (u_char *)(th + 1),
(th->th_off << 2) - sizeof(struct tcphdr),		(th->th_off << 2) - sizeof(struct tcphdr),
(thflags & TH_SYN) ? TO_SYN : 0);		(thflags & TH_SYN) ? TO_SYN : 0);

/*		/*
* 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, unless it is a RST segment.		* the segment, unless it is a RST segment or missing timestamps are
		* tolerated.
* See section 3.2 of RFC 7323.		* See section 3.2 of RFC 7323.
*/		*/
if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS) &&		if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS) &&
((thflags & TH_RST) == 0)) {		((thflags & TH_RST) == 0) && (V_tcp_tolerate_missing_ts == 0)) {
retval = 0;		retval = 0;
goto done_with_input;		goto done_with_input;
}		}
/*		/*
* If echoed timestamp is later than the current time, fall back to		* If echoed timestamp is later than the current time, fall back to
* non RFC1323 RTT calculation. Normalize timestamp if syncookies		* non RFC1323 RTT calculation. Normalize timestamp if syncookies
* were used when this connection was established.		* were used when this connection was established.
*/		*/
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