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Use more aggressive retransmit timeouts for the initial SYN packet.

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As we currently drop the connection after 4 retransmits + 2 ICMP errors,
this allows initial connection attempts to be dropped much faster.
This commit is contained in:
Jonathan Lemon 2001-02-26 21:33:55 +00:00
parent c693a045de
commit 7d42e30c2e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=73110
1 changed files with 7 additions and 1 deletions
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8
sys/netinet/tcp_timer.c
View file

@ -153,6 +153,9 @@ tcp_canceltimers(tp)
callout_stop(tp->tt_rexmt);
}
int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] =
{ 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 };
int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
{ 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
@ -393,7 +396,10 @@ tcp_timer_rexmt(xtp)
tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1));
}
tcpstat.tcps_rexmttimeo++;
rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
if (tp->t_state == TCPS_SYN_SENT)
rexmt = TCP_REXMTVAL(tp) * tcp_syn_backoff[tp->t_rxtshift];
else
rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
TCPT_RANGESET(tp->t_rxtcur, rexmt,
tp->t_rttmin, TCPTV_REXMTMAX);
/*