realm match support

modulename: ipt_realm.ko

configname: CONFIG_IP_NF_MATCH_REALM

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering (replaces ipchains)
└─>IP: Netfilter Configuration
└─>realm match support
In linux kernel since version 2.6.12 )
This option adds a `realm' match, which allows you to use the realm
key from the routing subsystem inside iptables.

This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
in tc world.

If you want to compile it as a module, say M here and read
<a href="https://www.kernel.org/doc/Documentation/modules.txt">Documentation/modules.txt</a>. If unsure, say `N'.
source code: