shorewall_code/Shorewall6/manpages/shorewall6-accounting.xml

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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
<refentry>
  <refmeta>
    <refentrytitle>shorewall6-accounting</refentrytitle>

    <manvolnum>5</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>accounting</refname>

    <refpurpose>Shorewall6 Accounting file</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>/etc/shorewall6/accounting</command>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>Accounting rules exist simply to count packets and bytes in
    categories that you define in this file. You may display these rules and
    their packet and byte counters using the <command>shorewall6 show
    accounting</command> command.</para>

    <para>Beginning with Shorewall 4.4.18, the accounting structure can be
    created with three root chains:</para>

    <itemizedlist>
      <listitem>
        <para><emphasis role="bold">accountin</emphasis>: Rules that are valid
        in the <emphasis role="bold">INPUT</emphasis> chain (may not specify
        an output interface).</para>
      </listitem>

      <listitem>
        <para><emphasis role="bold">accountout</emphasis>: Rules that are
        valid in the OUTPUT chain (may not specify an input interface or a MAC
        address).</para>
      </listitem>

      <listitem>
        <para><emphasis role="bold">accounting</emphasis>: Other rules.</para>
      </listitem>
    </itemizedlist>

    <para>The new structure is enabled by sectioning the accounting file in a
    manner similar to the <ulink url="manpages/shorewall-rules.html">rules
    file</ulink>. The sections are <emphasis role="bold">INPUT</emphasis>,
    <emphasis role="bold">OUTPUT</emphasis> and <emphasis
    role="bold">FORWARD</emphasis> and must appear in that order (although any
    of them may be omitted). The first non-commentary record in the accounting
    file must be a section header when sectioning is used.</para>

    <warning>
      <para>If sections are not used, the Shorewall rules compiler cannot
      detect certain violations of netfilter restrictions. These violations
      can result in run-time errors such as the following:</para>

      <blockquote>
        <para><emphasis role="bold">ip6tables-restore v1.4.13: Can't use -o
        with INPUT</emphasis></para>
      </blockquote>
    </warning>

    <para>Beginning with Shorewall 4.4.20, the ACCOUNTING_TABLE setting was
    added to shorewall.conf and shorewall6.conf. That setting determines the
    Netfilter table (filter or mangle) where the accounting rules are added.
    When ACCOUNTING_TABLE=mangle is specified, the available sections are
    <emphasis role="bold">PREROUTING</emphasis>, <emphasis
    role="bold">INPUT</emphasis>, <emphasis role="bold">OUTPUT</emphasis>,
    <emphasis role="bold">FORWARD</emphasis> and <emphasis
    role="bold">POSTROUTING</emphasis>.</para>

    <para>Section headers have the form:</para>

    <para><option>[?]SECTION</option>
    <replaceable>section-name</replaceable></para>

    <para>The optional "?" was added in Shorewalll 4.6.0 and is preferred.
    Existing configurations may be converted to use this form using the
    <command>shorewall6 update</command> command.</para>

    <para>When sections are enabled:</para>

    <itemizedlist>
      <listitem>
        <para>A jump to a user-defined accounting chain must appear before
        entries that add rules to that chain. This eliminates loops and
        unreferenced chains.</para>
      </listitem>

      <listitem>
        <para>An output interface may not be specified in the <emphasis
        role="bold">PREROUTING</emphasis> and <emphasis
        role="bold">INPUT</emphasis> sections.</para>
      </listitem>

      <listitem>
        <para>In the <emphasis role="bold">OUTPUT</emphasis> and <emphasis
        role="bold">POSTROUTING</emphasis> sections:</para>

        <itemizedlist>
          <listitem>
            <para>An input interface may not be specified</para>
          </listitem>

          <listitem>
            <para>Jumps to a chain defined in the <emphasis
            role="bold">INPUT</emphasis> or <emphasis
            role="bold">PREROUTING</emphasis> sections that specifies an input
            interface are prohibited</para>
          </listitem>

          <listitem>
            <para>MAC addresses may not be used</para>
          </listitem>

          <listitem>
            <para>Jump to a chain defined in the <emphasis
            role="bold">INPUT</emphasis> or <emphasis
            role="bold">PREROUTING</emphasis> section that specifies a MAC
            address are prohibited.</para>
          </listitem>
        </itemizedlist>
      </listitem>

      <listitem>
        <para>The default value of the CHAIN column is:</para>

        <itemizedlist>
          <listitem>
            <para><emphasis role="bold">accountin</emphasis> in the <emphasis
            role="bold">INPUT</emphasis> section</para>
          </listitem>

          <listitem>
            <para><emphasis role="bold">accountout</emphasis> in the <emphasis
            role="bold">OUTPUT</emphasis> section</para>
          </listitem>

          <listitem>
            <para><emphasis role="bold">accountfwd</emphasis> in the <emphasis
            role="bold">FORWARD</emphasis> section</para>
          </listitem>

          <listitem>
            <para><emphasis role="bold">accountpre</emphasis> in the <emphasis
            role="bold">PREROUTING</emphasis> section</para>
          </listitem>

          <listitem>
            <para><emphasis role="bold">accountpost</emphasis> in the
            <emphasis role="bold">POSTROUTING</emphasis> section</para>
          </listitem>
        </itemizedlist>
      </listitem>

      <listitem>
        <para>Traffic addressed to the firewall goes through the rules defined
        in the INPUT section.</para>
      </listitem>

      <listitem>
        <para>Traffic originating on the firewall goes through the rules
        defined in the OUTPUT section.</para>
      </listitem>

      <listitem>
        <para>Traffic being forwarded through the firewall goes through the
        rules from the FORWARD sections.</para>
      </listitem>
    </itemizedlist>

    <para>The columns in the file are as follows (where the column name is
    followed by a different name in parentheses, the different name is used in
    the alternate specification syntax).</para>

    <variablelist>
      <varlistentry>
        <term><emphasis role="bold">ACTION</emphasis> - {<emphasis
        role="bold">COUNT</emphasis>|<emphasis
        role="bold">DONE</emphasis>|<emphasis>chain</emphasis>[:<emphasis
        role="bold">{COUNT|JUMP}</emphasis>]|[?]COMMENT
        <replaceable>comment</replaceable>}</term>

        <listitem>
          <para>What to do when a matching packet is found.</para>

          <variablelist>
            <varlistentry>
              <term><emphasis role="bold">COUNT</emphasis></term>

              <listitem>
                <para>Simply count the match and continue with the next
                rule</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">DONE</emphasis></term>

              <listitem>
                <para>Count the match and don't attempt to match any other
                accounting rules in the chain specified in the <emphasis
                role="bold">CHAIN</emphasis> column.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis>chain</emphasis>[<emphasis
              role="bold">:</emphasis><emphasis
              role="bold">COUNT</emphasis>]</term>

              <listitem>
                <para>Where <emphasis>chain</emphasis> is the name of a chain;
                shorewall6 will create the chain automatically if it doesn't
                already exist. If a second chain is mentioned in the CHAIN
                column, then a jump from this second chain to
                <replaceable>chain</replaceable> is created. If no chain is
                named in the CHAIN column, then a jump from the default chain
                to <replaceable>chain</replaceable> is created. If <emphasis
                role="bold">:COUNT</emphasis> is included, a counting rule
                matching this entry will be added to
                <emphasis>chain</emphasis>. The <emphasis>chain</emphasis> may
                not exceed 29 characters in length and may be composed of
                letters, digits, dash ('-') and underscore ('_').</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis>chain</emphasis>:JUMP</term>

              <listitem>
                <para>Like the previous option without the <emphasis
                role="bold">:COUNT</emphasis> part.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">INLINE</emphasis></term>

              <listitem>
                <para>Added in Shorewall 4.5.16. Allows free form ip6tables
                matches to be specified following a ';'. In the generated
                ip6tables rule(s), the free form matches will follow any
                matches that are generated by the column contents.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis
              role="bold">NFACCT</emphasis>({<replaceable>object</replaceable>[!]}[,...])</term>

              <listitem>
                <para>Added in Shorewall 4.5.7. Provides a form of accounting
                that survives <command>shorewall stop/shorewall</command>
                start and <command>shorewall restart</command>. Requires the
                NFaccnt Match capability in your kernel and iptables.
                <replaceable>object</replaceable> names an nfacct object (see
                man nfaccnt(8)). Multiple rules can specify the same
                <replaceable>object</replaceable>; all packets that match any
                of the rules increment the packet and bytes count of the
                object.</para>

                <para>Prior to Shorewall 4.5.16, only one
                <replaceable>object</replaceable> could be specified.
                Beginning with Shorewall 4.5.16, an arbitrary number of
                objects may be given.</para>

                <para>With Shorewall 4.5.16 or later, an nfacct
                <replaceable>object</replaceable> in the list may optionally
                be followed by <emphasis role="bold">!</emphasis> to indicate
                that the nfacct <replaceable>object</replaceable> will be
                incremented unconditionally for each packet. When <emphasis
                role="bold">!</emphasis> is omitted, the
                <replaceable>object</replaceable> will be incremented only if
                all of the matches in the rule succeed.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">NFLOG</emphasis>[(nflog-parameters)]
              - Added in Shorewall-4.4.20.</term>

              <listitem>
                <para>Causes each matching packet to be sent via the currently
                loaded logging back end (usually nfnetlink_log) where it is
                available to accounting daemons through a netlink
                socket.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">[?]COMMENT</emphasis></term>

              <listitem>
                <para>The remainder of the line is treated as a comment which
                is attached to subsequent rules until another COMMENT line is
                found or until the end of the file is reached. To stop adding
                comments to rules, use a line with only the word
                COMMENT.</para>

                <note>
                  <para>Beginning with Shorewall 4.5.11, ?COMMENT is a synonym
                  for COMMENT and is preferred.</para>
                </note>
              </listitem>
            </varlistentry>
          </variablelist>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">CHAIN</emphasis> - {<emphasis
        role="bold">-</emphasis>|<emphasis>chain</emphasis>}</term>

        <listitem>
          <para>The name of a <emphasis>chain</emphasis>. If specified as
          <emphasis role="bold">-</emphasis> the <emphasis
          role="bold">accounting</emphasis> chain is assumed when the file is
          un-sectioned. When the file is sectioned, the default is one of
          accountin, accountout, etc. depending on the section. This is the
          chain where the accounting rule is added. The
          <emphasis>chain</emphasis> will be created if it doesn't already
          exist. The <emphasis>chain</emphasis> may not exceed 29 characters
          in length.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">SOURCE</emphasis> - {<emphasis
        role="bold">-</emphasis>|<emphasis
        role="bold">any</emphasis>|<emphasis
        role="bold">all</emphasis>|<emphasis>interface</emphasis>|<emphasis>interface</emphasis><emphasis
        role="bold">:<option>[</option></emphasis><emphasis>address</emphasis><option>]</option>|<emphasis>address</emphasis>}</term>

        <listitem>
          <para>Packet Source.</para>

          <para>The name of an <replaceable>interface</replaceable>, an
          <replaceable>address</replaceable> (host or net) or an
          <replaceable>interface</replaceable> name followed by ":" and a host
          or net <replaceable>address</replaceable>. An ipset name is also
          accepted as an <replaceable>address</replaceable>.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">DESTINATION</emphasis> (dest) - {<emphasis
        role="bold">-</emphasis>|<emphasis
        role="bold">any</emphasis>|<emphasis
        role="bold">all</emphasis>|<emphasis>interface</emphasis>|<emphasis>interface</emphasis><option>:[</option><emphasis>address</emphasis><option>]</option>|<emphasis>address</emphasis>}</term>

        <listitem>
          <para>Packet Destination.</para>

          <para>Format same as <emphasis role="bold">SOURCE</emphasis>
          column.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">PROTOCOL</emphasis> (proto) - {<emphasis
        role="bold">-</emphasis>|<emphasis
        role="bold">any</emphasis>|<emphasis
        role="bold">all</emphasis>|<emphasis>protocol-name</emphasis>|<emphasis>protocol-number</emphasis>|<emphasis
        role="bold">ipp2p</emphasis>[<emphasis
        role="bold">:</emphasis>{<emphasis
        role="bold">udp</emphasis>|<emphasis
        role="bold">all</emphasis>}]}</term>

        <listitem>
          <para>A <emphasis>protocol-name</emphasis> (from protocols(5)), a
          <emphasis>protocol-number</emphasis>, <emphasis
          role="bold">ipp2p</emphasis>, <emphasis
          role="bold">ipp2p:udp</emphasis> or <emphasis
          role="bold">ipp2p:all</emphasis></para>

          <para>Beginning with Shorewall 4.5.12, this column can accept a
          comma-separated list of protocols.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">DEST PORT(S)</emphasis> (dport) -
        {<emphasis role="bold">-</emphasis>|<emphasis
        role="bold">any</emphasis>|<emphasis
        role="bold">all</emphasis>|<emphasis>ipp2p-option</emphasis>|<emphasis>port-name-or-number</emphasis>[,<emphasis>port-name-or-number</emphasis>]...}</term>

        <listitem>
          <para>Destination Port number. Service name from services(5) or
          <emphasis>port number</emphasis>. May only be specified if the
          protocol is TCP (6), UDP (17), DCCP (33), SCTP (132) or UDPLITE
          (136).</para>

          <para>You may place a comma-separated list of port names or numbers
          in this column if your kernel and ip6tables include multi-port match
          support.</para>

          <para>If the PROTOCOL is <emphasis role="bold">ipp2p</emphasis> then
          this column must contain an <emphasis>ipp2p-option</emphasis>
          ("ip6tables -m ipp2p --help") without the leading "--". If no option
          is given in this column, <emphasis role="bold">ipp2p</emphasis> is
          assumed.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">SOURCE PORT(S)</emphasis> (sport) -
        {<emphasis role="bold">-</emphasis>|<emphasis
        role="bold">any</emphasis>|<emphasis
        role="bold">all</emphasis>|<emphasis>port-name-or-number</emphasis>[,<emphasis>port-name-or-number</emphasis>]...}</term>

        <listitem>
          <para>Service name from services(5) or <emphasis>port
          number</emphasis>. May only be specified if the protocol is TCP (6),
          UDP (17), DCCP (33), SCTP (132) or UDPLITE (136).</para>

          <para>You may place a comma-separated list of port numbers in this
          column if your kernel and ip6tables include multi-port match
          support.</para>

          <para>Beginning with Shorewall 4.5.15, you may place '=' in this
          column, provided that the DEST PORT(S) column is non-empty. This
          causes the rule to match when either the source port or the
          destination port in a packet matches one of the ports specified in
          DEST PORTS(S). Use of '=' requires multi-port match in your iptables
          and kernel.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">USER/GROUP</emphasis> (user) - [<emphasis
        role="bold">!</emphasis>][<emphasis>user-name-or-number</emphasis>][<emphasis
        role="bold">:</emphasis><emphasis>group-name-or-number</emphasis>][<emphasis
        role="bold">+</emphasis><emphasis>program-name</emphasis>]</term>

        <listitem>
          <para>This column may only be non-empty if the <emphasis
          role="bold">CHAIN</emphasis> is <emphasis
          role="bold">OUTPUT</emphasis>.</para>

          <para>When this column is non-empty, the rule applies only if the
          program generating the output is running under the effective
          <emphasis>user</emphasis> and/or <emphasis>group</emphasis>
          specified (or is NOT running under that id if "!" is given).</para>

          <para>Examples:</para>

          <variablelist>
            <varlistentry>
              <term>joe</term>

              <listitem>
                <para>program must be run by joe</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term>:kids</term>

              <listitem>
                <para>program must be run by a member of the 'kids'
                group</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term>!:kids</term>

              <listitem>
                <para>program must not be run by a member of the 'kids'
                group</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term>+upnpd</term>

              <listitem>
                <para>#program named upnpd</para>

                <important>
                  <para>The ability to specify a program name was removed from
                  Netfilter in kernel version 2.6.14.</para>
                </important>
              </listitem>
            </varlistentry>
          </variablelist>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">MARK</emphasis> - [<emphasis
        role="bold">!</emphasis>]<emphasis>value</emphasis>[/<emphasis>mask</emphasis>][<emphasis
        role="bold">:C</emphasis>]</term>

        <listitem>
          <para>Defines a test on the existing packet or connection mark. The
          rule will match only if the test returns true.</para>

          <para>If you don't want to define a test but need to specify
          anything in the following columns, place a "-" in this field.</para>

          <variablelist>
            <varlistentry>
              <term>!</term>

              <listitem>
                <para>Inverts the test (not equal)</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis>value</emphasis></term>

              <listitem>
                <para>Value of the packet or connection mark.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis>mask</emphasis></term>

              <listitem>
                <para>A mask to be applied to the mark before testing.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">:C</emphasis></term>

              <listitem>
                <para>Designates a connection mark. If omitted, the packet
                mark's value is tested.</para>
              </listitem>
            </varlistentry>
          </variablelist>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">IPSEC - <emphasis>option-list</emphasis>
        (Optional - Added in Shorewall 4.4.13 but broken until 4.5.4.1
        )</emphasis></term>

        <listitem>
          <para>The option-list consists of a comma-separated list of options
          from the following list. Only packets that will be encrypted or have
          been decrypted via an SA that matches these options will have their
          source address changed. May only be specified when sections are
          used.</para>

          <variablelist>
            <varlistentry>
              <term><emphasis
              role="bold">reqid=</emphasis><emphasis>number</emphasis></term>

              <listitem>
                <para>where <emphasis>number</emphasis> is specified using
                setkey(8) using the 'unique:<emphasis>number</emphasis> option
                for the SPD level.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">spi=</emphasis>&lt;number&gt;</term>

              <listitem>
                <para>where <emphasis>number</emphasis> is the SPI of the SA
                used to encrypt/decrypt packets.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">proto=</emphasis><emphasis
              role="bold">ah</emphasis>|<emphasis
              role="bold">esp</emphasis>|<emphasis
              role="bold">ipcomp</emphasis></term>

              <listitem>
                <para>IPSEC Encapsulation Protocol</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis
              role="bold">mss=</emphasis><emphasis>number</emphasis></term>

              <listitem>
                <para>sets the MSS field in TCP packets</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">mode=</emphasis><emphasis
              role="bold">transport</emphasis>|<emphasis
              role="bold">tunnel</emphasis></term>

              <listitem>
                <para>IPSEC mode</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis
              role="bold">tunnel-src=</emphasis><emphasis>address</emphasis>[/<emphasis>mask</emphasis>]</term>

              <listitem>
                <para>only available with mode=tunnel</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis
              role="bold">tunnel-dst=</emphasis><emphasis>address</emphasis>[/<emphasis>mask</emphasis>]</term>

              <listitem>
                <para>only available with mode=tunnel</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">strict</emphasis></term>

              <listitem>
                <para>Means that packets must match all rules.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">next</emphasis></term>

              <listitem>
                <para>Separates rules; can only be used with strict</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">yes</emphasis> or <emphasis
              role="bold">ipsec</emphasis></term>

              <listitem>
                <para>When used by itself, causes all traffic that will be
                encrypted/encapsulated or has been decrypted/un-encapsulated
                to match the rule.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">no</emphasis> or <emphasis
              role="bold">none</emphasis></term>

              <listitem>
                <para>When used by itself, causes all traffic that will not be
                encrypted/encapsulated or has been decrypted/un-encapsulated
                to match the rule.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">in</emphasis></term>

              <listitem>
                <para>May only be used in the FORWARD section and must be the
                first or the only item the list. Indicates that matching
                packets have been decrypted in input.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">out</emphasis></term>

              <listitem>
                <para>May only be used in the FORWARD section and must be the
                first or the only item in the list. Indicates that matching
                packets will be encrypted on output.</para>
              </listitem>
            </varlistentry>
          </variablelist>

          <para>If this column is non-empty and sections are not used,
          then:</para>

          <itemizedlist>
            <listitem>
              <para>A chain NAME appearing in the ACTION column must be a
              chain branched either directly or indirectly from the <emphasis
              role="bold">accipsecin</emphasis> or <emphasis
              role="bold">accipsecout</emphasis> chain.</para>
            </listitem>

            <listitem>
              <para>The CHAIN column must contain either <emphasis
              role="bold">accipsecin</emphasis> or <emphasis
              role="bold">accipsecout</emphasis> or a chain branched either
              directly or indirectly from those chains.</para>
            </listitem>

            <listitem>
              <para>These rules will NOT appear in the <emphasis
              role="bold">accounting</emphasis> chain.</para>
            </listitem>
          </itemizedlist>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">HEADERS -
        [!][any:|exactly:]</emphasis><replaceable>header-list
        </replaceable>(Optional - Added in Shorewall 4.4.15)</term>

        <listitem>
          <para>The <replaceable>header-list</replaceable> consists of a
          comma-separated list of headers from the following list.</para>

          <variablelist>
            <varlistentry>
              <term><emphasis role="bold">auth</emphasis>, <emphasis
              role="bold">ah</emphasis>, or <emphasis
              role="bold">51</emphasis></term>

              <listitem>
                <para><firstterm>Authentication Headers</firstterm> extension
                header.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">esp</emphasis>, or <emphasis
              role="bold">50</emphasis></term>

              <listitem>
                <para><firstterm>Encrypted Security Payload</firstterm>
                extension header.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">hop</emphasis>, <emphasis
              role="bold">hop-by-hop</emphasis> or <emphasis
              role="bold">0</emphasis></term>

              <listitem>
                <para>Hop-by-hop options extension header.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">route</emphasis>, <emphasis
              role="bold">ipv6-route</emphasis> or <emphasis
              role="bold">41</emphasis></term>

              <listitem>
                <para>IPv6 Route extension header.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">frag</emphasis>, <emphasis
              role="bold">ipv6-frag</emphasis> or <emphasis
              role="bold">44</emphasis></term>

              <listitem>
                <para>IPv6 fragmentation extension header.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">none</emphasis>, <emphasis
              role="bold">ipv6-nonxt</emphasis> or <emphasis
              role="bold">59</emphasis></term>

              <listitem>
                <para>No next header</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">proto</emphasis>, <emphasis
              role="bold">protocol</emphasis> or <emphasis
              role="bold">255</emphasis></term>

              <listitem>
                <para>Any protocol header.</para>
              </listitem>
            </varlistentry>
          </variablelist>

          <para>If <emphasis role="bold">any:</emphasis> is specified, the
          rule will match if any of the listed headers are present. If
          <emphasis role="bold">exactly:</emphasis> is specified, the will
          match packets that exactly include all specified headers. If neither
          is given, <emphasis role="bold">any:</emphasis> is assumed.</para>

          <para>If <emphasis role="bold">!</emphasis> is entered, the rule
          will match those packets which would not be matched when <emphasis
          role="bold">!</emphasis> is omitted.</para>
        </listitem>
      </varlistentry>
    </variablelist>

    <para>In all of the above columns except <emphasis
    role="bold">ACTION</emphasis> and <emphasis role="bold">CHAIN</emphasis>,
    the values <emphasis role="bold">-</emphasis>, <emphasis
    role="bold">any</emphasis> and <emphasis role="bold">all</emphasis> may be
    used as wildcards. Omitted trailing columns are also treated as
    wildcards.</para>
  </refsect1>

  <refsect1>
    <title>FILES</title>

    <para>/etc/shorewall6/accounting</para>
  </refsect1>

  <refsect1>
    <title>See ALSO</title>

    <para><ulink
    url="http://shorewall.net/Accounting.html">http://shorewall.net/Accounting.html
    </ulink></para>

    <para><ulink
    url="http://shorewall.net/shorewall_logging.html">http://shorewall.net/shorewall_logging.html</ulink></para>

    <para><ulink
    url="http://shorewall.net/configuration_file_basics.htm#Pairs">http://shorewall.net/configuration_file_basics.htm#Pairs</ulink></para>

    <para>shorewall6(8), shorewall6-actions(5), shorewall6-blacklist(5),
    shorewall6-hosts(5), shorewall6-interfaces(5), shorewall6-maclist(5),
    shorewall6-netmap(5),shorewall6-params(5), shorewall6-policy(5),
    shorewall6-providers(5), shorewall6-rtrules(5),
    shorewall6-routestopped(5), shorewall6-rules(5), shorewall6.conf(5),
    shorewall6-secmarks(5), shorewall6-tcclasses(5), shorewall6-tcdevices(5),
    shorewall6-tcrules(5), shorewall6-tos(5), shorewall6-tunnels(5),
    shorewall6-zones(5)</para>
  </refsect1>
</refentry>