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From 4.4BSD-Lite2: 

- When running the slow timers, skip PCBs in LISTEN state.
- When processing the persist timer, drop the connection if the connection
  idle time exceeds the maximum backoff for retransmit.  Part of
  kern/2335 (pete@daemon.net).
This commit is contained in:
thorpej 1997-12-17 06:04:17 +00:00
parent 82ce1f6a97
commit 04ec3df592
1 changed files with 26 additions and 3 deletions
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29
sys/netinet/tcp_timer.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: tcp_timer.c,v 1.25 1997/12/11 22:47:26 thorpej Exp $ */
/* $NetBSD: tcp_timer.c,v 1.26 1997/12/17 06:04:17 thorpej Exp $ */
/*
* Copyright (c) 1982, 1986, 1988, 1990, 1993
@ -62,8 +62,15 @@
int tcp_keepidle = TCPTV_KEEP_IDLE;
int tcp_keepintvl = TCPTV_KEEPINTVL;
int tcp_keepcnt = TCPTV_KEEPCNT; /* max idle probes */
int tcp_maxpersistidle = TCPTV_KEEP_IDLE; /* max idle time in persist */
int tcp_maxidle;
#else /* TUBA_INCLUDE */
extern int tcp_keepcnt;
extern int tcp_maxpersistidle;
#endif /* TUBA_INCLUDE */
/*
* Fast timeout routine for processing delayed acks
*/
@ -103,7 +110,7 @@ tcp_slowtimo()
static int syn_cache_last = 0;
s = splsoftnet();
tcp_maxidle = TCPTV_KEEPCNT * tcp_keepintvl;
tcp_maxidle = tcp_keepcnt * tcp_keepintvl;
/*
* Search through tcb's and update active timers.
*/
@ -115,7 +122,7 @@ tcp_slowtimo()
for (; inp != (struct inpcb *)&tcbtable.inpt_queue; inp = ninp) {
ninp = inp->inp_queue.cqe_next;
tp = intotcpcb(inp);
if (tp == 0)
if (tp == 0 || tp->t_state == TCPS_LISTEN)
continue;
for (i = 0; i < TCPT_NTIMERS; i++) {
if (tp->t_timer[i] && --tp->t_timer[i] == 0) {
@ -168,6 +175,8 @@ tcp_canceltimers(tp)
int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
{ 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
int tcp_totbackoff = 511; /* sum of tcp_backoff[] */
/*
* TCP timer processing.
*/
@ -269,6 +278,20 @@ tcp_timers(tp, timer)
* Force a byte to be output, if possible.
*/
case TCPT_PERSIST:
/*
* Hack: if the peer is dead/unreachable, we do not
* time out if the window is closed. After a full
* backoff, drop the connection if the idle time
* (no responses to probes) reaches the maximum
* backoff that we would use if retransmitting.
*/
if (tp->t_rxtshift == TCP_MAXRXTSHIFT &&
(tp->t_idle >= tcp_maxpersistidle ||
tp->t_idle >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
tcpstat.tcps_persistdrops++;
tp = tcp_drop(tp, ETIMEDOUT);
break;
}
tcpstat.tcps_persisttimeo++;
tcp_setpersist(tp);
tp->t_force = 1;