diff options
| author | Matthew Dillon <dillon@FreeBSD.org> | 2002-09-24 16:28:34 +0000 |
|---|---|---|
| committer | Matthew Dillon <dillon@FreeBSD.org> | 2002-09-24 16:28:34 +0000 |
| commit | 8d7717c8f823144d5517d3fb024d5b3b94d688c3 (patch) | |
| tree | 73189293116829c8a05bf1ae04d19b53a5fbb88e /sys | |
| parent | 2ddeca5af812996c8755d1c2644b9840711fbd38 (diff) | |
Notes
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/netinet/tcp_input.c | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index 0b08d2dd18ac..45195111277e 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -979,12 +979,21 @@ after_listen: tp->snd_nxt = tp->snd_max; tp->t_badrxtwin = 0; } - if ((to.to_flags & TOF_TS) != 0) + /* + * Recalculate the retransmit timer / rtt. + * + * Some machines (certain windows boxes) + * send broken timestamp replies during the + * SYN+ACK phase, ignore timestamps of 0. + */ + if ((to.to_flags & TOF_TS) != 0 && + to.to_tsecr) { tcp_xmit_timer(tp, ticks - to.to_tsecr + 1); - else if (tp->t_rtttime && - SEQ_GT(th->th_ack, tp->t_rtseq)) + } else if (tp->t_rtttime && + SEQ_GT(th->th_ack, tp->t_rtseq)) { tcp_xmit_timer(tp, ticks - tp->t_rtttime); + } tcp_xmit_bandwidth_limit(tp, th->th_ack); acked = th->th_ack - tp->snd_una; tcpstat.tcps_rcvackpack++; @@ -1773,11 +1782,17 @@ process_ACK: * Since we now have an rtt measurement, cancel the * timer backoff (cf., Phil Karn's retransmit alg.). * Recompute the initial retransmit timer. + * + * Some machines (certain windows boxes) send broken + * timestamp replies during the SYN+ACK phase, ignore + * timestamps of 0. */ - if (to.to_flags & TOF_TS) + if ((to.to_flags & TOF_TS) != 0 && + to.to_tsecr) { tcp_xmit_timer(tp, ticks - to.to_tsecr + 1); - else if (tp->t_rtttime && SEQ_GT(th->th_ack, tp->t_rtseq)) + } else if (tp->t_rtttime && SEQ_GT(th->th_ack, tp->t_rtseq)) { tcp_xmit_timer(tp, ticks - tp->t_rtttime); + } tcp_xmit_bandwidth_limit(tp, th->th_ack); /* |