man-pages/man8/tc-fw.8.html
2021-03-31 01:06:50 +01:00

131 lines
2.7 KiB
HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML><HEAD><TITLE>Man page of Firewall mark classifier in tc</TITLE>
</HEAD><BODY>
<H1>Firewall mark classifier in tc</H1>
Section: Linux (8)<BR>Updated: 21 Oct 2015<BR><A HREF="#index">Index</A>
<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
<P>
<A NAME="lbAB">&nbsp;</A>
<H2>NAME</H2>
fw - fwmark traffic control filter
<A NAME="lbAC">&nbsp;</A>
<H2>SYNOPSIS</H2>
<BR>
<B>tc</B> <B>filter</B> ... <B>fw</B> [ <B>classid</B>
<I>CLASSID</I> ] [
<B>action</B>
<I>ACTION_SPEC</I> ]
<A NAME="lbAD">&nbsp;</A>
<H2>DESCRIPTION</H2>
the
<B>fw</B>
filter allows to classify packets based on a previously set
<B>fwmark</B> by <B>iptables</B>.
If it is identical to the filter's
<B>handle</B>,
the filter matches.
<B>iptables</B>
allows to mark single packets with the
<B>MARK</B>
target, or whole connections using
<B>CONNMARK</B>.
The benefit of using this filter instead of doing the
heavy-lifting with
<B>tc</B>
itself is that on one hand it might be convenient to keep packet filtering and
classification in one place, possibly having to match a packet just once, and on
the other users familiar with
<B>iptables</B> but not <B>tc</B>
will have a less hard time adding QoS to their setups.
<A NAME="lbAE">&nbsp;</A>
<H2>OPTIONS</H2>
<DL COMPACT>
<DT id="1"><B>classid</B><I> CLASSID</I>
<DD>
Push matching packets to the class identified by
<I>CLASSID</I>.
<DT id="2"><B>action</B><I> ACTION_SPEC</I>
<DD>
Apply an action from the generic actions framework on matching packets.
</DL>
<A NAME="lbAF">&nbsp;</A>
<H2>EXAMPLES</H2>
Take e.g. the following tc filter statement:
<P>
<DL COMPACT><DT id="3"><DD>
tc filter add ... handle 6 fw classid 1:1
</DL>
<P>
will match if the packet's
<B>fwmark</B>
value is
<B>6</B>.
This is a sample
<B>iptables</B>
statement marking packets coming in on eth0:
<P>
<DL COMPACT><DT id="4"><DD>
iptables -t mangle -A PREROUTING -i eth0 -j MARK --set-mark 6
</DL>
<A NAME="lbAG">&nbsp;</A>
<H2>SEE ALSO</H2>
<B><A HREF="/cgi-bin/man/man2html?8+tc">tc</A></B>(8),
<B><A HREF="/cgi-bin/man/man2html?8+iptables">iptables</A></B>(8),
<B><A HREF="/cgi-bin/man/man2html?8+iptables-extensions">iptables-extensions</A></B>(8)
<P>
<HR>
<A NAME="index">&nbsp;</A><H2>Index</H2>
<DL>
<DT id="5"><A HREF="#lbAB">NAME</A><DD>
<DT id="6"><A HREF="#lbAC">SYNOPSIS</A><DD>
<DT id="7"><A HREF="#lbAD">DESCRIPTION</A><DD>
<DT id="8"><A HREF="#lbAE">OPTIONS</A><DD>
<DT id="9"><A HREF="#lbAF">EXAMPLES</A><DD>
<DT id="10"><A HREF="#lbAG">SEE ALSO</A><DD>
</DL>
<HR>
This document was created by
<A HREF="/cgi-bin/man/man2html">man2html</A>,
using the manual pages.<BR>
Time: 00:06:17 GMT, March 31, 2021
</BODY>
</HTML>