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67 lines
1.4 KiB
Groff
67 lines
1.4 KiB
Groff
.TH "Firewall mark classifier in tc" 8 "21 Oct 2015" "iproute2" "Linux"
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.SH NAME
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fw \- fwmark traffic control filter
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.SH SYNOPSIS
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.in +8
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.ti -8
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.BR tc " " filter " ... " fw " [ " classid
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.IR CLASSID " ] [ "
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.B action
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.IR ACTION_SPEC " ]"
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.SH DESCRIPTION
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the
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.B fw
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filter allows to classify packets based on a previously set
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.BR fwmark " by " iptables .
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If it is identical to the filter's
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.BR handle ,
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the filter matches.
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.B iptables
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allows to mark single packets with the
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.B MARK
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target, or whole connections using
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.BR CONNMARK .
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The benefit of using this filter instead of doing the
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heavy-lifting with
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.B tc
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itself is that on one hand it might be convenient to keep packet filtering and
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classification in one place, possibly having to match a packet just once, and on
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the other users familiar with
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.BR iptables " but not " tc
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will have a less hard time adding QoS to their setups.
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.SH OPTIONS
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.TP
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.BI classid " CLASSID"
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Push matching packets to the class identified by
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.IR CLASSID .
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.TP
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.BI action " ACTION_SPEC"
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Apply an action from the generic actions framework on matching packets.
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.SH EXAMPLES
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Take e.g. the following tc filter statement:
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.RS
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.EX
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tc filter add ... handle 6 fw classid 1:1
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.EE
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.RE
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will match if the packet's
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.B fwmark
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value is
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.BR 6 .
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This is a sample
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.B iptables
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statement marking packets coming in on eth0:
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.RS
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.EX
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iptables -t mangle -A PREROUTING -i eth0 -j MARK --set-mark 6
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.EE
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.RE
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.SH SEE ALSO
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.BR tc (8),
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.BR iptables (8),
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.BR iptables-extensions (8)
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