diff options
| author | John Baldwin <jhb@FreeBSD.org> | 2013-01-09 20:27:06 +0000 |
|---|---|---|
| committer | John Baldwin <jhb@FreeBSD.org> | 2013-01-09 20:27:06 +0000 |
| commit | 6c0ef8957f531d331b786924b97b9673cc86f440 (patch) | |
| tree | b2aca56ec54849882ea91f80c7d61d271af758e9 /sys/netinet/tcp_timer.c | |
| parent | d28396ae1352a52949dece899dfa672d752dfa00 (diff) | |
Notes
Diffstat (limited to 'sys/netinet/tcp_timer.c')
| -rw-r--r-- | sys/netinet/tcp_timer.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/netinet/tcp_timer.c b/sys/netinet/tcp_timer.c index b943eb6000c0..48444c1ffe72 100644 --- a/sys/netinet/tcp_timer.c +++ b/sys/netinet/tcp_timer.c @@ -119,6 +119,11 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, keepcnt, CTLFLAG_RW, &tcp_keepcnt, 0, /* max idle probes */ int tcp_maxpersistidle; +static int tcp_rexmit_drop_options = 0; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, rexmit_drop_options, CTLFLAG_RW, + &tcp_rexmit_drop_options, 0, + "Drop TCP options from 3rd and later retransmitted SYN"); + static int per_cpu_timers = 0; SYSCTL_INT(_net_inet_tcp, OID_AUTO, per_cpu_timers, CTLFLAG_RW, &per_cpu_timers , 0, "run tcp timers on all cpus"); @@ -595,7 +600,8 @@ tcp_timer_rexmt(void * xtp) * header compression code which trashes TCP segments containing * unknown-to-them TCP options. */ - if ((tp->t_state == TCPS_SYN_SENT) && (tp->t_rxtshift == 3)) + if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) && + (tp->t_rxtshift == 3)) tp->t_flags &= ~(TF_REQ_SCALE|TF_REQ_TSTMP|TF_SACK_PERMIT); /* * If we backed off this far, our srtt estimate is probably bogus. |