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.\" $OpenBSD: pfsync.4,v 1.5 2003/04/01 18:07:28 mickey Exp $
.\"
.\" Copyright (c) 2002 Michael Shalayeff
.\" 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.
.\"
.\" 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 MIND,
.\" 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 November 29, 2002
.Dt PFSYNC 4
.Os
.Sh NAME
.Nm pfsync
.Nd packet filter states table logging interface
.Sh SYNOPSIS
.Sy pseudo-device Nm pfsync
.Sh DESCRIPTION
The
.Nm pfsync
interface is the interface to the packet filter,
.Xr pf 4 ,
exposing all the changes to the state table.
This allows for both debugging of rulesets and monitoring
for changes in the table 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 PFSYNC_HDRLEN .
The header indicates the version of the protocol, address family,
action taken on the following states and the number of state
table entries attached in this packet.
This structure, defined in
.Pa <net/if_pfsync.h>
looks like:
.Bd -literal -offset indent
struct pfsync_header {
u_int8_t version;
u_int8_t af;
u_int8_t action;
u_int8_t count;
};
.Ed
.Sh EXAMPLES
.Bd -literal -offset indent
# ifconfig pfsync0 up
# tcpdump -s1500 -evtni pfsync0
.Ed
.Sh SEE ALSO
.Xr inet 4 ,
.Xr inet6 4 ,
.Xr netintro 4 ,
.Xr pf 4 ,
.Xr ifconfig 8 ,
.Xr tcpdump 8
.Sh HISTORY
The
.Nm
device first appeared in
.Ox 3.3 .
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