81 lines
2.5 KiB
Groff
81 lines
2.5 KiB
Groff
.\" $OpenBSD: pfsync.4,v 1.6 2003/06/06 10:29:41 jmc Exp $
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.\"
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.\" Copyright (c) 2002 Michael Shalayeff
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF MIND,
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.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd November 29, 2002
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.Dt PFSYNC 4
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.Os
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.Sh NAME
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.Nm pfsync
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.Nd packet filter states table logging interface
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.Sh SYNOPSIS
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.Sy pseudo-device Nm pfsync
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.Sh DESCRIPTION
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The
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.Nm pfsync
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interface is the interface to the packet filter,
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.Xr pf 4 ,
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exposing all the changes to the state table.
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This allows for both debugging of rulesets and monitoring
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for changes in the table by invoking
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.Xr tcpdump 8
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on the
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.Nm
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interface.
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.Pp
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Each packet retrieved on this interface has a header associated
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with it of length
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.Dv PFSYNC_HDRLEN .
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The header indicates the version of the protocol, address family,
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action taken on the following states and the number of state
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table entries attached in this packet.
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This structure, defined in
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.Aq Pa net/if_pfsync.h
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looks like:
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.Bd -literal -offset indent
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struct pfsync_header {
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u_int8_t version;
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u_int8_t af;
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u_int8_t action;
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u_int8_t count;
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};
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.Ed
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.Sh EXAMPLES
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.Bd -literal -offset indent
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# ifconfig pfsync0 up
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# tcpdump -s1500 -evtni pfsync0
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.Ed
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.Sh SEE ALSO
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.Xr inet 4 ,
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.Xr inet6 4 ,
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.Xr netintro 4 ,
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.Xr pf 4 ,
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.Xr ifconfig 8 ,
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.Xr tcpdump 8
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.Sh HISTORY
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The
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.Nm
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device first appeared in
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.Ox 3.3 .
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