> This release adds Kernel Connection Multiplexor (KCM), a facility that provides a message based interface over TCP for accelerating application layer protocols. ... a common use case is to implement a framed application layer protocol running over TCP ...

This was discussed on HN a while back. Gee, it's too bad that SCTP hasn't found more popularity. Reliable datagram-based (or stream-based) messaging, with support for binding to multiple endpoints.

In any case, KCM sounds like it's worth exploring.