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.\"	$OpenBSD: pflog.4,v 1.1 2001/12/10 22:02:05 weingart Exp $
.\"
.\" Copyright (c) 2001 Tobias Weingartner
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"    This product includes software developed by Tobias Weingartner.
.\" 4. The name of the author may not be used to endorse or promote products
.\"    derived from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd December 10, 2001
.Dt PFLOG 4
.Os
.Sh NAME
.Nm pflog
.Nd packet filter logging interface
.Sh SYNOPSIS
.Sy pseudo-device Nm pflog Em <number>
.Sh DESCRIPTION
The
.Nm pflog
interface is the interface the packet filter,
.Xr pf 4 ,
copies all the packets to which it has been configured to log.
In this way, all logged packets can easily be monitored in real
time by invoking
.Xr tcpdump 8
on the
.Nm
interface.
.Pp
Each packet retrieved on this interface has a header associated
with it of length
.Dv PFLOG_HDRLEN .
This header documents the address family, interface name, rule
number, reason, action, and direction of the packet that was logged.
This structure, defined in
.Pa <net/if_pflog.h>
looks like
.Bd -literal -offset indent
struct pfloghdr {
	u_int32_t af;
	char ifname[IFNAMSIZ];
	short rnr;
	u_short reason;
	u_short action;
	u_short dir;
};
.Ed
.Sh EXAMPLES
.Bd -literal -offset indent
# ifconfig pflog0 up
# tcpdump -n -e -ttt -i pflog0
.Ed
.Sh SEE ALSO
.Xr inet 4 ,
.Xr inet6 4 ,
.Xr netintro 4 ,
.Xr pf 4 ,
.Xr ifconfig 8 ,
.Xr pflogd 8 ,
.Xr tcpdump 8
.Sh HISTORY
The
.Nm
device first appeared in
.Ox 3.0 .
.\" .Sh BUGS
.\" Anything here?