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D8556.1789505181.diff
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Index: sys/netinet/tcp_input.c
===================================================================
--- sys/netinet/tcp_input.c
+++ sys/netinet/tcp_input.c
@@ -1644,6 +1644,9 @@
to.to_tsecr -= tp->ts_offset;
if (TSTMP_GT(to.to_tsecr, tcp_ts_getticks()))
to.to_tsecr = 0;
+ else if (tp->t_flags & TF_PREVVALID &&
+ tp->t_badrxtwin != 0 && SEQ_LT(to.to_tsecr, tp->t_badrxtwin))
+ cc_cong_signal(tp, th, CC_RTO_ERR);
}
/*
* If timestamps were negotiated during SYN/ACK they should
@@ -1749,9 +1752,10 @@
TCPSTAT_INC(tcps_predack);
/*
- * "bad retransmit" recovery.
+ * "bad retransmit" recovery without timestamps.
*/
- if (tp->t_rxtshift == 1 &&
+ if ((to.to_flags & TOF_TS) == 0 &&
+ tp->t_rxtshift == 1 &&
tp->t_flags & TF_PREVVALID &&
(int)(ticks - tp->t_badrxtwin) < 0) {
cc_cong_signal(tp, th, CC_RTO_ERR);
Index: sys/netinet/tcp_output.c
===================================================================
--- sys/netinet/tcp_output.c
+++ sys/netinet/tcp_output.c
@@ -203,7 +203,7 @@
#ifdef IPSEC
unsigned ipsec_optlen = 0;
#endif
- int idle, sendalot;
+ int idle, sendalot, curticks;
int sack_rxmit, sack_bytes_rxmt;
struct sackhole *p;
int tso, mtu;
@@ -253,6 +253,9 @@
}
}
again:
+ curticks = tcp_ts_getticks();
+ if (tp->t_rxtshift == 1 && (tp->t_flags & TF_RCVD_TSTMP))
+ tp->t_badrxtwin = curticks;
/*
* If we've recently taken a timeout, snd_max will be greater than
* snd_nxt. There may be SACK information that allows us to avoid
@@ -803,13 +806,13 @@
/* Timestamps. */
if ((tp->t_flags & TF_RCVD_TSTMP) ||
((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) {
- to.to_tsval = tcp_ts_getticks() + tp->ts_offset;
+ to.to_tsval = curticks + tp->ts_offset;
to.to_tsecr = tp->ts_recent;
to.to_flags |= TOF_TS;
/* Set receive buffer autosizing timestamp. */
if (tp->rfbuf_ts == 0 &&
(so->so_rcv.sb_flags & SB_AUTOSIZE))
- tp->rfbuf_ts = tcp_ts_getticks();
+ tp->rfbuf_ts = curticks;
}
/* Selective ACK's. */
if (tp->t_flags & TF_SACK_PERMIT) {
Index: sys/netinet/tcp_timer.c
===================================================================
--- sys/netinet/tcp_timer.c
+++ sys/netinet/tcp_timer.c
@@ -715,7 +715,8 @@
tp->t_flags |= TF_WASCRECOVERY;
else
tp->t_flags &= ~TF_WASCRECOVERY;
- tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1));
+ if ((tp->t_flags & TF_RCVD_TSTMP) == 0)
+ tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1));
tp->t_flags |= TF_PREVVALID;
} else
tp->t_flags &= ~TF_PREVVALID;

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