Connection tracking helpers in user-space via Netlink

modulename: nfnetlink_cthelper.ko

configname: CONFIG_NF_CT_NETLINK_HELPER

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>Connection tracking helpers in user-space via Netlink
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This option enables the user-space connection tracking helpers
infrastructure.

If unsure, say `N'.

source code:
net/netfilter/nfnetlink_cthelper.c