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379 lines
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379 lines
12 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
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<refentry>
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<refmeta>
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<refentrytitle>shorewall-arprules</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>arprules</refname>
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<refpurpose>Shorewall ARP rules file</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>/etc/shorewall/arprules</command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>This file was added in Shorwall 4.5.12 and is used to describe
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low-level rules managed by arptables (8). These rules only affect Address
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Resolution Protocol (ARP), Reverse Address Resolution Protocol (RARP) and
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Dynamic Reverse Address Resolution Protocol (DRARP) frames.</para>
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<para>The columns in the file are as shown below. MAC addresses are
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specified normally (6 hexidecimal numbers separated by colons).</para>
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<variablelist>
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<varlistentry>
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<term><emphasis role="bold">ACTION</emphasis></term>
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<listitem>
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<para>Describes the action to take when a frame matches the criteria
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in the other columns. Possible values are:</para>
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<variablelist>
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<varlistentry>
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<term><emphasis role="bold">ACCEPT</emphasis></term>
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<listitem>
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<para>This is the default action if no rules matches a frame;
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it lets the frame go through.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">DROP</emphasis></term>
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<listitem>
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<para>Causes the frame to be dropped.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">SNAT:</emphasis><replaceable>ip-address</replaceable></term>
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<listitem>
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<para>Modifies the source IP address to the specified
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<replaceable>ip-address</replaceable>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">DNAT:</emphasis><replaceable>ip-address</replaceable></term>
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<listitem>
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<para>Modifies the destination IP address to the specified
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<replaceable>ip-address</replaceable>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">SMAT:</emphasis><replaceable>mac-address</replaceable></term>
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<listitem>
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<para>Modifies the source MAC address to the specified
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<replaceable>mac-address</replaceable>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">DMAT:</emphasis><replaceable>mac-address</replaceable></term>
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<listitem>
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<para>Modifies the destination MAC address to the specified
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<replaceable>mac-address</replaceable>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">SNATC:</emphasis><replaceable>ip-address</replaceable></term>
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<listitem>
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<para>Like SNAT except that the frame is then passed to the
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next rule.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">DNATC:</emphasis><replaceable>ip-address</replaceable></term>
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<listitem>
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<para>Like DNAT except that the frame is then passed to the
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next rule.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">SMATC:</emphasis><replaceable>mac-address</replaceable></term>
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<listitem>
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<para>Like SMAT except that the frame is then passed to the
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next rule.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">DMATC:</emphasis><replaceable>mac-address</replaceable></term>
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<listitem>
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<para>Like DMAT except that the frame is then passed to the
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next rule.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">SOURCE</emphasis> - <emphasis
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role="bold">[<replaceable>interface</replaceable>[:[!]<replaceable>ipaddress</replaceable>[/ip<replaceable>mask</replaceable>][:[!]<replaceable>macaddress</replaceable>[/<replaceable>macmask</replaceable>]]]]</emphasis></term>
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<listitem>
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<para>Where</para>
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<variablelist>
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<varlistentry>
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<term><replaceable>interface</replaceable></term>
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<listitem>
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<para>Is an interface defined in
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shorewall-interfaces(5).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>ipaddress</replaceable></term>
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<listitem>
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<para>is an IPv4 address. DNS names are not allowed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>ipmask</replaceable></term>
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<listitem>
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<para>specifies a mask to be applied to
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<replaceable>ipaddress</replaceable>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>macaddress</replaceable></term>
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<listitem>
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<para>The source MAC address.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>macmask</replaceable></term>
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<listitem>
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<para>Mask for MAC address; must be specified as 6 hexidecimal
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numbers separated by colons.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>When '!' is specified, the test is inverted.</para>
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<para>If not specified, matches only frames originating on the
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firewall itself.</para>
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<caution>
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<para>Either SOURCE or DEST must be specified.</para>
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</caution>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">DEST</emphasis> - <emphasis
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role="bold">[<replaceable>interface</replaceable>[:[!]<replaceable>ipaddress</replaceable>[/ip<replaceable>mask</replaceable>][:[!]<replaceable>macaddress</replaceable>[/<replaceable>macmask</replaceable>]]]]</emphasis></term>
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<listitem>
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<para>Where</para>
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<variablelist>
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<varlistentry>
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<term><replaceable>interface</replaceable></term>
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<listitem>
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<para>Is an interface defined in
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shorewall-interfaces(5).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>ipaddress</replaceable></term>
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<listitem>
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<para>is an IPv4 address. DNS Names are not allowed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>ipmask</replaceable></term>
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<listitem>
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<para>specifies a mask to be applied to frame
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addresses.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>macaddress</replaceable></term>
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<listitem>
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<para>The destination MAC address.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>macmask</replaceable></term>
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<listitem>
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<para>Mask for MAC address; must be specified as 6 hexidecimal
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numbers separated by colons.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>When '!' is specified, the test is inverted and the rule
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matches frames which do not match the specified address/mask.</para>
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<para>If not specified, matches only frames originating on the
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firewall itself.</para>
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<para>If both SOURCE and DEST are specified, then both interfaces
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must be bridge ports on the same bridge.</para>
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<caution>
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<para>Either SOURCE or DEST must be specified.</para>
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</caution>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>ARP OPCODE - [[!]<replaceable>opcode</replaceable>]</term>
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<listitem>
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<para>Optional. Describes the type of frame. Possible
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<replaceable>opcode</replaceable> values are:</para>
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<variablelist>
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<varlistentry>
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<term>1</term>
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<listitem>
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<para>ARP Request</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>2</term>
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<listitem>
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<para>ARP Reply</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>3</term>
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<listitem>
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<para>RARP Request</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>4</term>
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<listitem>
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<para>RARP Reply</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>5</term>
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<listitem>
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<para>Dynamic RARP Request</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>6</term>
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<listitem>
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<para>Dynamic RARP Reply</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>7</term>
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<listitem>
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<para>Dynamic RARP Error</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>8</term>
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<listitem>
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<para>InARP Request</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>9</term>
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<listitem>
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<para>ARP NAK</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>When '!' is specified, the test is inverted and the rule
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matches frames which do not match the specifed
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<replaceable>opcode</replaceable>.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Example</title>
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<para>The eth1 interface has both a pubiic IP address and a private
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address (10.1.10.11/24). When sending ARP requests to 10.1.10.0/24, use
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the private address as the IP source:</para>
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<programlisting>#ACTION SOURCE DEST ARP OPCODE
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SNAT:10.1.10.11 - eth1:10.1.10.0/24 1</programlisting>
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</refsect1>
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<refsect1>
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<title>FILES</title>
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<para>/etc/shorewall/arprules</para>
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</refsect1>
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</refentry>
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