"realm" match support

modulename: xt_realm.ko


Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>"realm" match support
In linux kernel since version (release Date: 2006-09-22)  
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
<file:Documentation/kbuild/modules.rst>. If unsure, say `N'.

source code: