Netfilter nf_tables masquerade support

modulename: nft_masq.ko

configname: CONFIG_NFT_MASQ

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>Netfilter nf_tables masquerade support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This option adds the "masquerade" expression that you can use
to perform NAT in the masquerade flavour.

source code:
net/netfilter/nft_masq.c