162 lines
5.4 KiB
Groff
162 lines
5.4 KiB
Groff
.\" $NetBSD: ipf.8,v 1.9 2004/03/28 09:00:56 martti Exp $
|
|
.\"
|
|
.TH IPF 8
|
|
.SH NAME
|
|
ipf \- alters packet filtering lists for IP packet input and output
|
|
.SH SYNOPSIS
|
|
.B ipf
|
|
[
|
|
.B \-6AcdDEInoPrsvVyzZ
|
|
] [
|
|
.B \-l
|
|
<block|pass|nomatch>
|
|
] [
|
|
.B \-T
|
|
<optionlist>
|
|
] [
|
|
.B \-F
|
|
<i|o|a|s|S>
|
|
]
|
|
.B \-f
|
|
<\fIfilename\fP>
|
|
[
|
|
.B \-f
|
|
<\fIfilename\fP>
|
|
[...]]
|
|
.SH DESCRIPTION
|
|
.PP
|
|
\fBipf\fP opens the filenames listed (treating "\-" as stdin) and parses the
|
|
file for a set of rules which are to be added or removed from the packet
|
|
filter rule set.
|
|
.PP
|
|
Each rule processed by \fBipf\fP
|
|
is added to the kernel's internal lists if there are no parsing problems.
|
|
Rules are added to the end of the internal lists, matching the order in
|
|
which they appear when given to \fBipf\fP.
|
|
.SH OPTIONS
|
|
.TP
|
|
.B \-6
|
|
This option is required to parse IPv6 rules and to have them loaded.
|
|
.TP
|
|
.B \-A
|
|
Set the list to make changes to the active list (default).
|
|
.TP
|
|
.B \-c <language>
|
|
This option causes \fBipf\fP to generate output files for a compiler that
|
|
supports \fBlanguage\fI. At present, the only target language supported is
|
|
\fBC\fB (-cc) for which two files - \fBip_rules.c\fP
|
|
and \fBip_rules.h\fP are generated in the \fBCURRENT DIRECTORY\fP when
|
|
\fBipf\fP is being run. These files can be used with the
|
|
\fBIPFILTER_COMPILED\fP kernel option to build filter rules staticly into
|
|
the kernel.
|
|
.TP
|
|
.B \-d
|
|
Turn debug mode on. Causes a hexdump of filter rules to be generated as
|
|
it processes each one.
|
|
.TP
|
|
.B \-D
|
|
Disable the filter (if enabled). Not effective for loadable kernel versions.
|
|
.TP
|
|
.B \-E
|
|
Enable the filter (if disabled). Not effective for loadable kernel versions.
|
|
.TP
|
|
.BR \-F \0<i|o|a>
|
|
This option specifies which filter list to flush. The parameter should
|
|
either be "i" (input), "o" (output) or "a" (remove all filter rules).
|
|
Either a single letter or an entire word starting with the appropriate
|
|
letter maybe used. This option maybe before, or after, any other with
|
|
the order on the command line being that used to execute options.
|
|
.TP
|
|
.BR \-F \0<s|S>
|
|
To flush entries from the state table, the \fB-F\fP option is used in
|
|
conjunction with either "s" (removes state information about any non-fully
|
|
established connections) or "S" (deletes the entire state table). Only
|
|
one of the two options may be given. A fully established connection
|
|
will show up in \fBipfstat -s\fP output as 4/4, with deviations either
|
|
way indicating it is not fully established any more.
|
|
.TP
|
|
.BR \-f \0<filename>
|
|
This option specifies which files
|
|
\fBipf\fP should use to get input from for modifying the packet filter rule
|
|
lists.
|
|
.TP
|
|
.B \-I
|
|
Set the list to make changes to the inactive list.
|
|
.TP
|
|
.B \-l \0<pass|block|nomatch>
|
|
Use of the \fB-l\fP flag toggles default logging of packets. Valid
|
|
arguments to this option are \fBpass\fP, \fBblock\fP and \fBnomatch\fP.
|
|
When an option is set, any packet which exits filtering and matches the
|
|
set category is logged. This is most useful for causing all packets
|
|
which don't match any of the loaded rules to be logged.
|
|
.TP
|
|
.B \-n
|
|
This flag (no-change) prevents \fBipf\fP from actually making any ioctl
|
|
calls or doing anything which would alter the currently running kernel.
|
|
.TP
|
|
.B \-o
|
|
Force rules by default to be added/deleted to/from the output list, rather
|
|
than the (default) input list.
|
|
.TP
|
|
.B \-P
|
|
Add rules as temporary entries in the authentication rule table.
|
|
.TP
|
|
.B \-r
|
|
Remove matching filter rules rather than add them to the internal lists
|
|
.TP
|
|
.B \-s
|
|
Swap the active filter list in use to be the "other" one.
|
|
.B \-T <optionlist>
|
|
This option allows run-time changing of IPFilter kernel variables. Some
|
|
variables require IPFilter to be in a disabled state (\fB-D\fP) for changing,
|
|
others do not. The optionlist parameter is a comma separated list of tuning
|
|
commands. A tuning command is either "list" (retrieve a list of all variables
|
|
in the kernel, their maximum, minimum and current value), a single variable
|
|
name (retrieve its current value) and a variable name with a following
|
|
assignment to set a new value. Some examples follow.
|
|
.nf
|
|
# Print out all IPFilter kernel tunable parameters
|
|
ipf -T list
|
|
# Display the current TCP idle timeout and then set it to 3600
|
|
ipf -D -T fr_tcpidletimeout,fr_tcpidletimeout=3600 -E
|
|
# Display current values for fr_pass and fr_chksrc, then set fr_chksrc to 1.
|
|
ipf -T fr_pass,fr_chksrc,fr_chksrc=1
|
|
.fi
|
|
.TP
|
|
.B \-v
|
|
Turn verbose mode on. Displays information relating to rule processing.
|
|
.TP
|
|
.B \-V
|
|
Show version information. This will display the version information compiled
|
|
into the ipf binary and retrieve it from the kernel code (if running/present).
|
|
If it is present in the kernel, information about its current state will be
|
|
displayed (whether logging is active, default filtering, etc).
|
|
.TP
|
|
.B \-y
|
|
Manually resync the in-kernel interface list maintained by IP Filter with
|
|
the current interface status list.
|
|
.TP
|
|
.B \-z
|
|
For each rule in the input file, reset the statistics for it to zero and
|
|
display the statistics prior to them being zeroed.
|
|
.TP
|
|
.B \-Z
|
|
Zero global statistics held in the kernel for filtering only (this doesn't
|
|
affect fragment or state statistics).
|
|
.DT
|
|
.SH FILES
|
|
/dev/ipauth
|
|
.br
|
|
/dev/ipl
|
|
.br
|
|
/dev/ipstate
|
|
.SH SEE ALSO
|
|
ipftest(1), mkfilters(1), ipf(4), ipl(4), ipf(5), ipf.conf(5), ipf6.conf(5), ipfstat(8), ipmon(8), ipnat(8)
|
|
.SH DIAGNOSTICS
|
|
.PP
|
|
Needs to be run as root for the packet filtering lists to actually
|
|
be affected inside the kernel.
|
|
.SH BUGS
|
|
.PP
|
|
If you find any, please send email to me at darrenr@pobox.com
|