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.\" $OpenBSD: pfctl.8,v 1.52 2002/09/18 07:33:47 deraadt Exp $
.\"
.\" Copyright (c) 2001 Kjell Wooding. 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. 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 June 24, 2001
.Dt PFCTL 8
.Os
.Sh NAME
.Nm pfctl
.Nd control the packet filter (PF) and network address translation (NAT) device
.Sh SYNOPSIS
.Nm pfctl
.Op Fl deqhnNrRvzO
.Op Fl F Ar modifier
.Op Fl f Ar file
.Op Fl k Ar host
.Op Fl s Ar modifier
.Op Fl x Ar level
.Sh DESCRIPTION
The
.Nm
utility communicates with the packet filter device using the
ioctl interface described in
.Xr pf 4 .
It allows rule set and parameter configuration and retrieval of status
information from the packet filter.
.Pp
Packet filtering restricts the types of packets that pass through
network interfaces entering or leaving the host based on filter
rules as described in
.Xr pf.conf 5 .
The packet filter can also replace addresses and ports of packets.
Replacing source addresses and ports of outgoing packets is called
NAT (Network Address Translation) and is used to connect an internal
network (usually reserved address space) to an external one (the
Internet) by making all connections to external hosts appear to
come from the gateway.
Replacing destination addresses and ports of incoming packets
is used to redirect connections to different hosts and/or ports.
A combination of both translations, bidirectional NAT, is also
supported.
Translation rules are described in
.Xr pf.conf 5 .
.Pp
When the variable pf=YES is set in
.Xr rc.conf 8 ,
the rule file specified with the variable pf_rules
is loaded automatically by the
.Xr rc 8
scripts and the packet filter is enabled.
.Pp
The packet filter does not itself forward packets between interfaces.
Forwarding can be enabled using the
.Xr sysctl 8
variable
.Li net.inet.ip.forwarding=1 ,
permanently in
.Xr sysctl.conf 5 .
.Pp
The
.Nm
utility provides several commands.
The options are as follows:
.Bl -tag -width Ds
.It Fl d
Disable the packet filter.
.It Fl e
Enable the packet filter.
.It Fl f Ar file
Load rule file. This file may contain scrub, nat, and filter
rules, in that order.
.It Fl F Ar modifier
Flush one of the following.
Modifier name may be abbreviated:
.Bl -tag -width "F rules " -compact
.It Fl F Ar nat
Flush the NAT rules.
.It Fl F Ar rules
Flush the filter rules.
.It Fl F Ar state
Flush the state table (NAT and filter).
.It Fl F Ar info
Flush the filter information (statistics that are not bound to rules).
.It Fl F Ar all
Flush all of the above.
.El
.It Fl k Ar host
Kill all of the state entries from the specified host.
A second
.Fl k Ar host
option may be specified, which will kill all the state entries
from the first host to the second host.
.Bd -literal
Example:
Kill all of the state entries from host
# pfctl -k host
Kill all of the state entries from host1 to host2
# pfctl -k host1 -k host2
.Ed
.It Fl h
Help.
.It Fl n
Do not actually load rules, just parse them.
.It Fl N
Load only the NAT rules present in the rule file. Filter rules and options are
ignored
.It Fl q
Only print errors and warnings.
.It Fl r
Perform reverse DNS lookups on states when displaying them.
.It Fl R
Load only the filter rules present in the rule file. NAT rules and options are
ignored.
.It Fl O
Load only the options present in the rule file. Filter and NAT rules are
ignored
.It Fl s Ar modifier
Show filter parameters.
Modifier names may be abbreviated:
.Bl -tag -width "s rules " -compact
.It Fl s Ar nat
Show the currently loaded NAT rules.
.It Fl s Ar rules
Show the currently loaded filter rules.
When used together with -v, the per-rule statistics (number of evaluations,
packets and bytes) are also shown.
Note that the 'skip step' optimization done automatically by the kernel
will skip evaluation of rules where possible.
Packets passed statefully are counted in the rule that created the state
(even though the rule isn't evaluated more than once for the entire
connection).
.It Fl s Ar state
Show the contents of the state table.
.It Fl s Ar info
Show filter information (statistics and counters).
.It Fl s Ar labels
Show per-rule statistics (in terse format) of filter rules with labels,
useful for accounting.
.It Fl s Ar timeouts
Show the current global timeouts.
.It Fl s Ar memory
Show the current pool memory hard limits.
.It Fl s Ar all
Show all of the above.
.El
.It Fl v
Produce more verbose output.
.It Fl x Ar level
Set the debug level to one of the following.
Level names may be abbreviated:
.Bl -tag -width "x urgent " -compact
.It Fl x Ar none
Don't generate debug messages.
.It Fl x Ar urgent
Generate debug messages only for serious errors.
.It Fl x Ar misc
Generate debug messages for various errors.
.El
.It Fl z
Clear per-rule statistics.
.El
.Sh FILES
.Bl -tag -width "/etc/pf.conf" -compact
.It Pa /etc/pf.conf
Packet filter rules file.
.El
.Sh SEE ALSO
.Xr pf 4 ,
.Xr pf.conf 5 ,
.Xr ftp-proxy 8 ,
.Xr rc 8 ,
.Xr rc.conf 8 ,
.Xr sysctl 8 ,
.Xr sysctl.conf 5
.Sh HISTORY
The
.Nm
program and the
.Xr pf 4
filter mechanism first appeared in
.Ox 3.0 .
|
