Add the ability to see TCP timers via netstat -x. This can be a useful

feature when you have a seemingly stuck socket and want to figure
out why it has not been closed yet.

No plans to MFC this, as it changes the netstat sysctl ABI.

Reviewed by:	andre, rwatson, Eric Van Gyzen

1 files changed, 9 insertions, 0 deletions

diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h
index 96353f3..93d3feb 100644
--- a/sys/netinet/tcp_var.h
+++ b/sys/netinet/tcp_var.h
@@ -495,11 +495,20 @@ void	kmod_tcpstat_inc(int statnum);
  * included.  Not all of our clients do.
  */
 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
+struct xtcp_timer {
+	int tt_rexmt;	/* retransmit timer */
+	int tt_persist;	/* retransmit persistence */
+	int tt_keep;	/* keepalive */
+	int tt_2msl;	/* 2*msl TIME_WAIT timer */
+	int tt_delack;	/* delayed ACK timer */
+	int t_rcvtime; 	/* Time since last packet received */
+};
 struct	xtcpcb {
 	size_t	xt_len;
 	struct	inpcb	xt_inp;
 	struct	tcpcb	xt_tp;
 	struct	xsocket	xt_socket;
+	struct	xtcp_timer xt_timer;
 	u_quad_t	xt_alignment_hack;
 };
 #endif