add filtering on direction; ok mpf@ deraadt@ feedback jmc@

1 files changed, 11 insertions, 2 deletions

diff --git a/usr.sbin/tcpdump/tcpdump.8 b/usr.sbin/tcpdump/tcpdump.8
index 256825331b9..a1a8585ad5a 100644
--- a/usr.sbin/tcpdump/tcpdump.8
+++ b/usr.sbin/tcpdump/tcpdump.8
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: tcpdump.8,v 1.65 2007/08/28 12:52:06 markus Exp $
+.\"	$OpenBSD: tcpdump.8,v 1.66 2008/04/18 21:35:11 djm Exp $
 .\"
 .\" Copyright (c) 1987, 1988, 1989, 1990, 1991, 1992, 1994, 1995, 1996
 .\"	The Regents of the University of California.  All rights reserved.
@@ -19,7 +19,7 @@
 .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 .\"
-.Dd $Mdocdate: August 28 2007 $
+.Dd $Mdocdate: April 18 2008 $
 .Dt TCPDUMP 8
 .Os
 .Sh NAME
@@ -30,6 +30,7 @@
 .Bk -words
 .Op Fl adefILlNnOopqStvXx
 .Op Fl c Ar count
+.Op Fl D Ar direction
 .Oo Fl E Oo Ar espalg : Oc Ns
 .Ar espkey Oc
 .Op Fl F Ar file
@@ -56,6 +57,14 @@ Attempt to convert network and broadcast addresses to names.
 Exit after receiving
 .Ar count
 packets.
+.It Fl D Ar direction
+Select packets flowing in the specified
+.Ar direction .
+Valid directions are:
+.Cm in
+and
+.Cm out .
+The default is to accept packets flowing in any direction.
 .It Fl d
 Dump the compiled packet-matching code in a human readable form to
 standard output and stop.