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if (optlen) {		if (optlen) {
bcopy(opt, th + 1, optlen);		bcopy(opt, th + 1, optlen);
th->th_off = (sizeof (struct tcphdr) + optlen) >> 2;		th->th_off = (sizeof (struct tcphdr) + optlen) >> 2;
}		}
th->th_flags = flags;		th->th_flags = flags;
/*		/*
* Calculate receive window. Don't shrink window,		* Calculate receive window. Don't shrink window,
* but avoid silly window syndrome.		* but avoid silly window syndrome.
		* If a RST segment is sent, advertise a window of zero.
*/		*/
		if (flags & TH_RST) {
		recwin = 0;
		} else {
if (recwin < (so->so_rcv.sb_hiwat / 4) &&		if (recwin < (so->so_rcv.sb_hiwat / 4) &&
recwin < tp->t_maxseg)		recwin < tp->t_maxseg)
recwin = 0;		recwin = 0;
if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) &&		if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) &&
recwin < (tp->rcv_adv - tp->rcv_nxt))		recwin < (tp->rcv_adv - tp->rcv_nxt))
recwin = (tp->rcv_adv - tp->rcv_nxt);		recwin = (tp->rcv_adv - tp->rcv_nxt);
		}
/*		/*
* According to RFC1323 the window field in a SYN (i.e., a <SYN>		* According to RFC1323 the window field in a SYN (i.e., a <SYN>
* or <SYN,ACK>) segment itself is never scaled. The <SYN,ACK>		* or <SYN,ACK>) segment itself is never scaled. The <SYN,ACK>
* case is handled in syncache.		* case is handled in syncache.
*/		*/
if (flags & TH_SYN)		if (flags & TH_SYN)
th->th_win = htons((u_short)		th->th_win = htons((u_short)
(min(sbspace(&so->so_rcv), TCP_MAXWIN)));		(min(sbspace(&so->so_rcv), TCP_MAXWIN)));
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