diff options
| author | Stuart Henderson <sthen@cvs.openbsd.org> | 2011-07-06 23:44:21 +0000 |
|---|---|---|
| committer | Stuart Henderson <sthen@cvs.openbsd.org> | 2011-07-06 23:44:21 +0000 |
| commit | 68494a1c586f98ca697a91771fddff329f1dcf14 (patch) | |
| tree | add29116d30508f173c5db57724b3e51943d22f7 /sys/netinet/tcp_timer.c | |
| parent | eec1e28e98046e35507e4a84c524322c3bce684c (diff) | |
Add sysctl net.inet.tcp.always_keepalive, when this is set the system
behaves as if SO_KEEPALIVE was set on all TCP sockets, forcing keepalives
to be sent every net.inet.tcp.keepidle half-seconds.
In conjunction with a keepidle value greatly reduced from the default,
this can be useful for keeping sessions open if you are stuck on a network
with short NAT or firewall timeouts.
Feedback from various people, ok henning@ claudio@
Diffstat (limited to 'sys/netinet/tcp_timer.c')
| -rw-r--r-- | sys/netinet/tcp_timer.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sys/netinet/tcp_timer.c b/sys/netinet/tcp_timer.c index a1dd72aae79..7f2511d751a 100644 --- a/sys/netinet/tcp_timer.c +++ b/sys/netinet/tcp_timer.c @@ -1,4 +1,4 @@ -/* $OpenBSD: tcp_timer.c,v 1.45 2010/07/03 04:44:51 guenther Exp $ */ +/* $OpenBSD: tcp_timer.c,v 1.46 2011/07/06 23:44:20 sthen Exp $ */ /* $NetBSD: tcp_timer.c,v 1.14 1996/02/13 23:44:09 christos Exp $ */ /* @@ -55,6 +55,7 @@ #include <netinet/ip_icmp.h> #include <netinet/tcp_seq.h> +int tcp_always_keepalive; int tcp_keepidle; int tcp_keepintvl; int tcp_maxpersistidle; /* max idle time in persist */ @@ -435,7 +436,8 @@ tcp_timer_keep(void *arg) tcpstat.tcps_keeptimeo++; if (TCPS_HAVEESTABLISHED(tp->t_state) == 0) goto dropit; - if (tp->t_inpcb->inp_socket->so_options & SO_KEEPALIVE && + if ((tcp_always_keepalive || + tp->t_inpcb->inp_socket->so_options & SO_KEEPALIVE) && tp->t_state <= TCPS_CLOSING) { if ((tcp_maxidle > 0) && ((tcp_now - tp->t_rcvtime) >= tcp_keepidle + tcp_maxidle)) |