kernelconfig_penguin

Connection tracking labels

configname: CONFIG_NF_CONNTRACK_LABELS

Linux Kernel Configuration
└─> Networking support
└─> Networking options
└─> Network packet filtering framework (Netfilter)
└─> Core Netfilter Configuration
└─> Connection tracking labels

In linux kernel since version 3.1 (release Date: 2011-10-24)  

This option enables support for assigning user-defined flag bits
to connection tracking entries. It can be used with xtables connlabel
match and the nftables ct expression.