Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
---
changes since v1:
use <replaceable> in cmdsynopsis, update example
doc/nft.xml | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
diff --git a/doc/nft.xml b/doc/nft.xml
index 8ea280417742..80f201e89d37 100644
--- a/doc/nft.xml
+++ b/doc/nft.xml
@@ -950,6 +950,77 @@ filter input iif $int_ifs accept
</variablelist>
<refsect2>
+ <title>Ct</title>
+ <para>
+ <cmdsynopsis>
+ <command>ct</command>
+ <arg choice="req">helper</arg>
+ <arg choice="req">type</arg>
+ <arg choice="req"><replaceable>type</replaceable></arg>
+ <arg choice="req">protocol</arg>
+ <arg choice="req"><replaceable>protocol</replaceable></arg>
+ <arg choice="opt">l3proto</arg>
+ <arg choice="opt"><replaceable>family</replaceable></arg>
+ </cmdsynopsis>
+ </para>
+ <para>
+ Ct helper is used to define connection tracking helpers that can then be used in combination with the <literal>"ct helper set"</literal> statement.
+ type and protocol are mandatory, l3proto is derived from the table family by default, i.e. in the inet table the kernel will
+ try to load both the ipv4 and ipv6 helper backends, if they are supported by the kernel.
+ </para>
+ <table frame="all">
+ <title>conntrack helper specifications</title>
+ <tgroup cols='3' align='left' colsep='1' rowsep='1'>
+ <colspec colname='c1'/>
+ <colspec colname='c2'/>
+ <colspec colname='c3'/>
+ <thead>
+ <row>
+ <entry>Keyword</entry>
+ <entry>Description</entry>
+ <entry>Type</entry>
+ </row>
+ </thead>
+ <tbody>
+ <row>
+ <entry>type</entry>
+ <entry>name of helper type</entry>
+ <entry>quoted string (e.g. "ftp")</entry>
+ </row>
+ <row>
+ <entry>protocol</entry>
+ <entry>layer 4 protocol of the helper</entry>
+ <entry>string (e.g. tcp)</entry>
+ </row>
+ <row>
+ <entry>l3proto</entry>
+ <entry>layer 3 protocol of the helper</entry>
+ <entry>address family (e.g. ip)</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ <example>
+ <title>defining and assigning ftp helper</title>
+ <para>
+ Unlike iptables, helper assignment needs to be performed after the conntrack lookup has completed, for example
+ with the default 0 hook priority.
+ </para>
+ <programlisting>
+table inet myhelpers {
+ ct helper ftp-standard {
+ type "ftp" protocol tcp
+ }
+ chain prerouting {
+ type filter hook prerouting priority 0;
+ tcp dport 21 ct helper set "ftp-standard"
+ }
+}
+ </programlisting>
+ </example>
+ </refsect2>
+
+ <refsect2>
<title>Counter</title>
<para>
<cmdsynopsis>
@@ -3376,6 +3447,11 @@ ip6 filter output log flags all
</thead>
<tbody>
<row>
+ <entry>helper</entry>
+ <entry>name of ct helper object to assign to the connection</entry>
+ <entry>quoted string</entry>
+ </row>
+ <row>
<entry>mark</entry>
<entry>Connection tracking mark</entry>
<entry>mark</entry>
--
2.10.2
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