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Shorewall-docs2/Macros.xml
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@ -21,7 +21,7 @@
</author>
</authorgroup>
<pubdate>2005-09-20</pubdate>
<pubdate>2005-10-01</pubdate>
<copyright>
<year>2005</year>
@ -48,7 +48,7 @@
</caution>
<section>
<title>What are Shorewall Macros?</title>
<title>Overview of Shorewall Macros?</title>
<para>Shorewall macros allow a symbolic name to be associated with a
series of one or more iptables rules. The symbolic name may appear in the
@ -78,9 +78,9 @@
macro.</para>
<programlisting>#
# Shorewall 2.2 /usr/share/shorewall/macro.AllowSMB
# Shorewall 3.0 /usr/share/shorewall/macro.SMB
#
# Allow Microsoft SMB traffic. You need to invoke this macro in
# Handle Microsoft SMB traffic. You need to invoke this macro in
# both directions.
#
######################################################################################
@ -105,6 +105,79 @@ PARAM - - tcp 135,139,445
url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>).</para>
</listitem>
</orderedlist>
<para>Most Standard Macros are <firstterm>parameterized</firstterm>. That
means that you specify what you want to do (ACCEPT, DROP, REJECT, etc.)
when you invoke the macro. The SMB macro shown above is parameterized
(note PARAM in the TARGET column). When invoking a parameterized macro,
you follow the name of the macro with a slash ("/") and the action that
you want to substitute for PARAM.</para>
<para>Example:</para>
<blockquote>
<para>/etc/shorewall/rules:</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
SMB/ACCEPT loc fw </programlisting>
<para>The above is equivalent to coding the following series of
rules:</para>
<programlisting>#TARGET SOURCE DEST PROTO DEST PORT(s)
ACCEPT loc fw udp 135,445
ACCEPT loc fw udp 137:139
ACCEPT loc fw udp 1024: 137
ACCEPT loc fw tcp 135,139,445</programlisting>
</blockquote>
<para>Logging is covered in <link linkend="Logging">a following
section</link>. The other columns are treated as follows:</para>
<variablelist>
<varlistentry>
<term>SOURCE and DEST</term>
<listitem>
<para>If the rule in the macro file specifies a value and the
invocation of the rule also specifies a value then the value in the
invocation is appended to the value in the rule using ":" as a
separator.</para>
<para>Example:</para>
<blockquote>
<para>/etc/shorewall/macro.SMTP</para>
<programlisting>#TARGET SOURCE DEST PROTO DEST PORT(S)
PARAM - loc tcp 25</programlisting>
<para>/etc/shorewall/rules</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
SMTP/DNAT:info net 192.168.1.5</programlisting>
<para>This would be equivalent to coding the following directly in
/etc/shorewall/rules</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
DNAT:info net loc:192.168.1.5 tcp 25</programlisting>
</blockquote>
</listitem>
</varlistentry>
<varlistentry>
<term>Remaining columns</term>
<listitem>
<para>Any value in the invocation replaces the value in the rule in
the macro.</para>
</listitem>
</varlistentry>
</variablelist>
<para>One remaining restriction must be mentioned: macros that are invoked
from actions cannot themselves invoke other actions.</para>
</section>
<section>
@ -339,7 +412,7 @@ PARAM - - tcp 135,139,445
LogAndAccept loc $FW tcp 22</programlisting>
</section>
<section>
<section id="Logging">
<title>Macros and Logging</title>
<para>Specifying a log level in a rule that invokes a user- or