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Prepare for being able to accept multiple '-m' instances in an iptables command

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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@3754 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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teastep 2006-03-29 19:26:53 +00:00
parent 2e1cecd923
commit 6f53c6564b
4 changed files with 139 additions and 7 deletions
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5
docs/CompiledPrograms.xml
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@ -15,7 +15,7 @@
</author>
</authorgroup>
<pubdate>2006-03-24</pubdate>
<pubdate>2006-03-29</pubdate>
<copyright>
<year>2006</year>
@ -214,7 +214,8 @@ CONNMARK_MATCH=Yes # Connmark Match
RAW_TABLE=Yes # Raw Table
IPP2P_MATCH= # IPP2P Match
CLASSIFY_TARGET=Yes # CLASSIFY Target
ENHANCED_REJECT=Yes # Extended REJECT</programlisting>
ENHANCED_REJECT=Yes # Extended REJECT
KLUDGEFREE= # iptables accepts multiple "-m iprange" or "-m physdev" in a single command</programlisting>
</blockquote>
<para>As you can see, the file contains a simple list of shell variable

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137
docs/upgrade_issues.xml
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@ -21,7 +21,13 @@
<year>2004</year>
<holder>2005 Thomas M. Eastep</holder>
<year>2005</year>
<year>2006</year>
<holder>Thomas M. Eastep</holder>
<holder></holder>
</copyright>
<legalnotice>
@ -62,9 +68,134 @@
</section>
<section>
<title>Version &gt;= 3.0.0</title>
<title>Version &gt;= 3.2.0</title>
<para></para>
<orderedlist>
<listitem>
<para>If you are upgrading from version 2.4 or earlier, please read
the 3.0.0 upgrade considerations below.</para>
</listitem>
<listitem>
<para>A number of macros have been split into two. The macros affected
are:</para>
<simplelist>
<member>IMAP</member>
<member>LDAP</member>
<member>NNTP</member>
<member>POP3</member>
<member>SMTP</member>
</simplelist>
<para>Each of these macros now handles only traffic on the native
(plaintext) port. There is a corresponding macro with S added to the
end of the name for the SSL version of the same protocol. Thus each
macro results in the insertion of only one port per invocation. The
Web macro has not been split, but two new macros, HTTP and HTTPS have
been created. The Web macro is deprecated in favour of these new
macros, and may be removed from future Shorewall releases.</para>
<para>These changes have been made to ensure no unexpected ports are
opened due to the use of macros.</para>
</listitem>
<listitem>
<para>In previous Shorewall releases, DNAT and REDIRECT rules
supported a special syntax for exclusion of a subnet from the effect
of the rule.</para>
<para>Example:</para>
<blockquote>
<para>Z2 is a subzone of Z1:</para>
<programlisting>DNAT Z1!Z2 loc:192.168.1.4 ...</programlisting>
</blockquote>
<para>That feature has never worked correctly when Z2 is a dynamic
zone. Furthermore, now that Shorewall supports exclusion lists, the
capability is redundant since the above rule can now be written in the
form:</para>
<programlisting>DNAT Z1:!&lt;list of exclusions&gt; loc:192.168.1.4 ...</programlisting>
<para>Beginning with Shorewall 3.2.0, the special exclusion syntax
will no longer be supported.</para>
</listitem>
<listitem>
<para>Important if you use the QUEUE target.</para>
<para>In the /etc/shorewall/rules file and in actions, you may now
specify 'tcpsyn' in the PROTO column. 'tcpsyn' is equivalent to 'tcp'
but also requires that the SYN flag is set and the RST, FIN and ACK
flags be off ("--syn" is added to the iptables rule).</para>
<para>As part of this change, Shorewall no longer adds the "--syn"
option to TCP rules that specify QUEUE as their target.</para>
</listitem>
<listitem>
<para>Extension Scripts may require change</para>
<para>In previous releases, extension scripts were executed during
<command>[re]start</command> by using the Bourne Shell "." operator.
In addition to executing commands during <command>[re]start</command>,
these scripts had to "save" the commands to be executed during
<command>shorewall restore</command>.</para>
<para>This clumsiness has been eliminated in Shorewall 3.2. In
Shorewall 3.2, extension scripts are copied in-line into the compiled
program and are executed in-line during <command>start</command>,
<command>restart</command> and <command>restore</command>.</para>
<para>This new approach has two implications for existing
scripts.</para>
<orderedlist numeration="loweralpha">
<listitem>
<para>It is no longer necessary to save the commands; so functions
like 'save_command', 'run_and_save_command' and
'ensure_and_save_command' need no longer be called. The generated
program will contain functions with these names:</para>
<simplelist>
<member>save_command() - does nothing</member>
<member>run_and_save_command() - runs the passed
command</member>
<member>ensure_and_save_command() - runs the passed command and
stops the firewall if the command fails.</member>
</simplelist>
<para>These functions should provide for transparent migration of
scripts that use them until you can get around to eliminating
their use completely.</para>
</listitem>
<listitem>
<para>When the extension script is copied into the compiled
program, it is indented to line up with the surrounding code. If
you have 'awk' installed on your system, the Shorewall compiler
will correctly handle line continuation (last character on the
line = "\"). If you do not have awk, it will not be possible to
use line-continuation in your extension scripts. In no case is it
possible to continue a quoted string over multiple lines without
having additional whitespace inserted into the string.</para>
</listitem>
</orderedlist>
</listitem>
</orderedlist>
</section>
<section>
<title>Version &gt;= 3.0.0</title>
<orderedlist>
<listitem>