Netfilter nf_tables number generator module

modulename: nft_numgen.ko

configname: CONFIG_NFT_NUMGEN

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>Netfilter nf_tables number generator module
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This option adds the number generator expression used to perform
incremental counting and random numbers bound to a upper limit.

source code: