/usr/src/xtables-addons-1.40/xt_IPMARK.Kconfig is in xtables-addons-dkms 1.40-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | config NETFILTER_XT_TARGET_IPMARK
tristate '"IPMARK" target support'
depends on NETFILTER_XTABLES && NETFILTER_ADVANCED
depends on IP_NF_MANGLE || IP6_NF_MANGLE
---help---
This option adds an "IPMARK" target, which allows you to create
rules in the "mangle" table which alter the netfilter mark field
basing on the source or destination ip address of the packet.
This is very useful for very fast massive shaping -- using only one
rule you can direct packets to houndreds different queues. You
will probably find it helpful only if your linux machine acts as a
shaper for many others computers.
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