USDF storage

[vkatsuba]

Need to implement USDF storage.
Useful links:

• What is the 5G Unstructured Data Storage Function (UDSF) for?
• 5G UDSF - Design Principles with Unstructured Data Storage Function Webinar

[RoadRunnr]

UDSF is only one piece of the puzzle.

Ingress GTP handlers for GTP-C and GTP-U are also needed. And possibly some kind of cluster interconnection of the C nodes.

The UPF nodes need at least support for "PFCP sessions successively controlled by different SMFs of an SMF set" and it would be preferable if they had "UE IP address/prefix allocation in the UP function" (see 3GG TS 29.244, Rel 16)