D28634.id83796.diff
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D28634.id83796.diff
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	Index: sys/netinet/tcp_input.c
	===================================================================
	--- sys/netinet/tcp_input.c
	+++ sys/netinet/tcp_input.c
	@@ -2566,6 +2566,7 @@
	*/
	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))
	@@ -2626,6 +2627,7 @@
	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;

	@@ -2689,7 +2691,8 @@
	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;