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Add a sysctl (net.inet.tcp.always_keepalive: 0) that when set will force

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keepalive on all tcp sessions.  Setsockopt(2) cannot override this setting.
Maybe another one is needed that just changes the default for SO_KEEPALIVE ?
Requested by: Joe Greco <jgreco@brasil.moneng.mei.com>
This commit is contained in:
Poul-Henning Kamp 1996-04-04 11:17:04 +00:00
parent 816a3d836e
commit 34be9bf3ce
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=15039
1 changed files with 7 additions and 2 deletions
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9
sys/netinet/tcp_timer.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_timer.c 8.2 (Berkeley) 5/24/95
* $Id: tcp_timer.c,v 1.13 1996/01/04 21:34:21 olah Exp $
* $Id: tcp_timer.c,v 1.14 1996/03/11 15:13:35 davidg Exp $
*/
#ifndef TUBA_INCLUDE
@ -72,6 +72,10 @@ static int tcp_keepintvl = TCPTV_KEEPINTVL;
SYSCTL_INT(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl,
CTLFLAG_RW, &tcp_keepintvl , 0, "");
static int always_keepalive = 0;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, always_keepalive,
CTLFLAG_RW, &always_keepalive , 0, "");
static int tcp_keepcnt = TCPTV_KEEPCNT;
/* max idle probes */
static int tcp_maxpersistidle = TCPTV_KEEP_IDLE;
@ -314,7 +318,8 @@ tcp_timers(tp, timer)
tcpstat.tcps_keeptimeo++;
if (tp->t_state < TCPS_ESTABLISHED)
goto dropit;
if (tp->t_inpcb->inp_socket->so_options & SO_KEEPALIVE &&
if ((always_keepalive ||
tp->t_inpcb->inp_socket->so_options & SO_KEEPALIVE) &&
tp->t_state <= TCPS_CLOSE_WAIT) {
if (tp->t_idle >= tcp_keepidle + tcp_maxidle)
goto dropit;