Add connection drop capability for persist timeouts.
Reviewed by: Andras Olah Obtained from: 4.4BSD-lite2 via W. Richard Stevens
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=9773
@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tcp_timer.c 8.1 (Berkeley) 6/10/93
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* $Id: tcp_timer.c,v 1.6 1995/04/12 06:49:56 davidg Exp $
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* $Id: tcp_timer.c,v 1.7 1995/05/30 08:09:59 rgrimes Exp $
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*/
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#ifndef TUBA_INCLUDE
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@ -63,6 +63,8 @@
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int tcp_keepidle = TCPTV_KEEP_IDLE;
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int tcp_keepintvl = TCPTV_KEEPINTVL;
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int tcp_maxidle;
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int tcp_maxpersistidle = TCPTV_KEEP_IDLE;
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int tcp_totbackoff = 511;
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#endif /* TUBA_INCLUDE */
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/*
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* Fast timeout routine for processing delayed acks
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@ -266,6 +268,20 @@ tcp_timers(tp, timer)
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*/
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case TCPT_PERSIST:
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tcpstat.tcps_persisttimeo++;
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/*
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* Hack: if the peer is dead/unreachable, we do not
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* time out if the window is closed. After a full
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* backoff, drop the connection if the idle time
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* (no responses to probes) reaches the maximum
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* backoff that we would use if retransmitting.
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*/
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if (tp->t_rxtshift == TCP_MAXRXTSHIFT &&
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(tp->t_idle >= tcp_maxpersistidle ||
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tp->t_idle >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
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tcpstat.tcps_persistdrop++;
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tp = tcp_drop(tp, ETIMEDOUT);
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break;
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}
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tcp_setpersist(tp);
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tp->t_force = 1;
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(void) tcp_output(tp);
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tcp_var.h 8.3 (Berkeley) 4/10/94
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* $Id: tcp_var.h,v 1.13 1995/06/29 18:11:24 wollman Exp $
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* $Id: tcp_var.h,v 1.14 1995/07/10 15:39:16 wollman Exp $
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*/
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#ifndef _NETINET_TCP_VAR_H_
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@ -239,6 +239,7 @@ struct tcpstat {
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u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
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u_long tcps_rexmttimeo; /* retransmit timeouts */
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u_long tcps_persisttimeo; /* persist timeouts */
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u_long tcps_persistdrop; /* conns dropped by persist timeout */
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u_long tcps_keeptimeo; /* keepalive timeouts */
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u_long tcps_keepprobe; /* keepalive probes sent */
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u_long tcps_keepdrops; /* connections dropped in keepalive */
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