D28634.id86323.diff
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D28634.id86323.diff
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	diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
	--- a/sys/netinet/tcp_input.c
	+++ b/sys/netinet/tcp_input.c
	@@ -2564,6 +2564,7 @@
	*/
	if (th->th_ack != tp->snd_una \|\|
	((tp->t_flags & TF_SACK_PERMIT) &&
	+ (to.to_flags & TOF_SACK) &&
	!sack_changed))
	break;
	else if (!tcp_timer_active(tp, TT_REXMT))
	@@ -2617,6 +2618,7 @@
	tp->snd_cwnd = imax(maxseg, tp->snd_nxt - tp->snd_recover +
	tp->sackhint.sack_bytes_rexmit + (snd_cnt * maxseg));
	} else if ((tp->t_flags & TF_SACK_PERMIT) &&
	+ (to.to_flags & TOF_SACK) &&
	IN_FASTRECOVERY(tp->t_flags)) {
	int awnd;

	@@ -2694,7 +2696,8 @@
	tp->sackhint.recover_fs = max(1,
	tp->snd_nxt - tp->snd_una);
	}
	- if (tp->t_flags & TF_SACK_PERMIT) {
	+ if ((tp->t_flags & TF_SACK_PERMIT) &&
	+ (to.to_flags & TOF_SACK)) {
	TCPSTAT_INC(
	tcps_sack_recovery_episode);
	tp->snd_recover = tp->snd_nxt;