CONFIG_NFT_FIB (not configurable)

modulename: nft_fib.ko

configname: CONFIG_NFT_FIB

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>NFT_FIB
In linux kernel since version 4.1 (release Date: 2015-06-21)  
source code:
net/netfilter/nft_fib.c