http://www.rfc-editor.org/rfc/rfc8329.txt
RFC 8329: Framework for Interface to Network Security Functions, D. Lopez, E. Lopez, L. Dunbar, J. Strassner, R. Kumar2018-02-01T23:00:00-00:00This document describes the framework for Interface to Network Security Functions (I2NSF) and defines a reference model (including major functional components) for I2NSF. Network Security Functions (NSFs) are packet-processing engines that inspect and optionally modify packets traversing networks, either directly or in the context of sessions to which the packet is associated.