Netfilter netlink interface

modulename: nfnetlink.ko

configname: CONFIG_NETFILTER_NETLINK

Linux Kernel Configuration
└─>Networking
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>Netfilter netlink interface
In linux kernel since version 2.6.14 (release Date: 2005-10-27)  
If this option is enabled, the kernel will include support
for the new netfilter netlink interface.

source code:
net/netfilter/nfnetlink.c

is selected by
CONFIG_NF_CT_NETLINK