D16503.diff
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	Index: head/sys/netinet/tcp_timewait.c
	===================================================================
	--- head/sys/netinet/tcp_timewait.c
	+++ head/sys/netinet/tcp_timewait.c
	@@ -230,6 +230,7 @@
	struct tcptw twlocal, *tw;
	struct inpcb *inp = tp->t_inpcb;
	struct socket *so;
	+ uint32_t recwin;
	bool acknow, local;
	#ifdef INET6
	bool isipv6 = inp->inp_inc.inc_flags & INC_ISIPV6;
	@@ -292,10 +293,16 @@
	/*
	* Recover last window size sent.
	*/
	- if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt))
	- tw->last_win = (tp->rcv_adv - tp->rcv_nxt) >> tp->rcv_scale;
	- else
	- tw->last_win = 0;
	+ so = inp->inp_socket;
	+ recwin = lmin(lmax(sbspace(&so->so_rcv), 0),
	+ (long)TCP_MAXWIN << tp->rcv_scale);
	+ if (recwin < (so->so_rcv.sb_hiwat / 4) &&
	+ recwin < tp->t_maxseg)
	+ recwin = 0;
	+ if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) &&
	+ recwin < (tp->rcv_adv - tp->rcv_nxt))
	+ recwin = (tp->rcv_adv - tp->rcv_nxt);
	+ tw->last_win = htons((u_short)(recwin >> tp->rcv_scale));

	/*
	* Set t_recent if timestamps are used on the connection.
	@@ -332,7 +339,6 @@
	* and might not be needed here any longer.
	*/
	tcp_discardcb(tp);
	- so = inp->inp_socket;
	soisdisconnected(so);
	tw->tw_so_options = so->so_options;
	inp->inp_flags \|= INP_TIMEWAIT;