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Add connection drop capability for persist timeouts.

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Reviewed by:	Andras Olah
Obtained from:	4.4BSD-lite2 via W. Richard Stevens
This commit is contained in:
dg 1995-07-29 18:48:44 +00:00
parent cd6ef599be
commit 03d42e175c
2 changed files with 19 additions and 2 deletions
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18
sys/netinet/tcp_timer.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_timer.c 8.1 (Berkeley) 6/10/93
* $Id: tcp_timer.c,v 1.6 1995/04/12 06:49:56 davidg Exp $
* $Id: tcp_timer.c,v 1.7 1995/05/30 08:09:59 rgrimes Exp $
*/
#ifndef TUBA_INCLUDE
@ -63,6 +63,8 @@
int tcp_keepidle = TCPTV_KEEP_IDLE;
int tcp_keepintvl = TCPTV_KEEPINTVL;
int tcp_maxidle;
int tcp_maxpersistidle = TCPTV_KEEP_IDLE;
int tcp_totbackoff = 511;
#endif /* TUBA_INCLUDE */
/*
* Fast timeout routine for processing delayed acks
@ -266,6 +268,20 @@ tcp_timers(tp, timer)
*/
case TCPT_PERSIST:
tcpstat.tcps_persisttimeo++;
/*
* 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_persistdrop++;
tp = tcp_drop(tp, ETIMEDOUT);
break;
}
tcp_setpersist(tp);
tp->t_force = 1;
(void) tcp_output(tp);

3
sys/netinet/tcp_var.h
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_var.h 8.3 (Berkeley) 4/10/94
* $Id: tcp_var.h,v 1.13 1995/06/29 18:11:24 wollman Exp $
* $Id: tcp_var.h,v 1.14 1995/07/10 15:39:16 wollman Exp $
*/
#ifndef _NETINET_TCP_VAR_H_
@ -239,6 +239,7 @@ struct tcpstat {
u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
u_long tcps_rexmttimeo; /* retransmit timeouts */
u_long tcps_persisttimeo; /* persist timeouts */
u_long tcps_persistdrop; /* conns dropped by persist timeout */
u_long tcps_keeptimeo; /* keepalive timeouts */
u_long tcps_keepprobe; /* keepalive probes sent */
u_long tcps_keepdrops; /* connections dropped in keepalive */