CONFIG_NET_SOCK_MSG (not configurable)

modulename: tcp_bpf.ko

and/or

skmsg.ko

configname: CONFIG_NET_SOCK_MSG

Linux Kernel Configuration
└─>Networking support
└─>NET_SOCK_MSG
In linux kernel since version 4.2 (release Date: 2015-08-30)  
The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or
ULPs (upper layer modules, e.g. TLS) to process L7 application data
with the help of BPF programs.

source code:
net/ipv4/tcp_bpf.c
depends
CONFIG_NET