IPv4 nf_tables packet duplication support

modulename: nft_dup_ipv4.ko

configname: CONFIG_NFT_DUP_IPV4

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>IP: Netfilter Configuration
└─>IPv4 nf_tables packet duplication support
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This module enables IPv4 packet duplication support for nf_tables.

source code:
net/ipv4/netfilter/nft_dup_ipv4.c