Explore Control/User Plane Separation (CUPS) and PFCP in this OsmoDevCall presentation by Harald "LaF0rge" Welte. Dive into the CUPS Architecture Reference Model, interfaces, and the PFCP protocol. Learn about key CUPS functions, including traffic detection and charging/usage monitoring. Understand essential PFCP concepts, session-related procedures, and packet processing abstractions such as Packet Detection Rules (PDR), Forwarding Action Rules (FAR), Usage Reporting Rules (URR), QoS Enforcement Rules (QER), and Buffering Action Rules (BAR). Discover the relationship between CUPS and 5G, and explore open-source implementations in the user plane using C language userland with normal socket API.