diff options
Diffstat (limited to 'sys/netinet/tcp_timer.c')
| -rw-r--r-- | sys/netinet/tcp_timer.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/sys/netinet/tcp_timer.c b/sys/netinet/tcp_timer.c index ddab8d6d4b28..9badee0f24cd 100644 --- a/sys/netinet/tcp_timer.c +++ b/sys/netinet/tcp_timer.c @@ -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); |