KCM sockets

modulename: kcm.ko

configname: CONFIG_AF_KCM

Linux Kernel Configuration
└─>Networking support
└─>KCM sockets
In linux kernel since version 4.1 (release Date: 2015-06-21)  
KCM (Kernel Connection Multiplexor) sockets provide a method
for multiplexing messages of a message based application
protocol over kernel connectons (e.g. TCP connections).

source code:
net/kcm/
selects
CONFIG_BPF_SYSCALL
CONFIG_STREAM_PARSER