Follow up on NAS Registration Accept lib
This MR is a follow up on !2984 (merged).
The goal is to enhance the NAS Registration Accept lib:
- Add regression test for NAS Registration Accept: the goal of this test is to
prevent on the decoding of the NAS Registration Accept sent by the OAI CN5G
- Add equality check and free utility functions to NAS Registration Accept
library
- Free NAS Registration Accept after use: heap memory is allocated for this
message during decoding and shall be free after processing
- Remove harcoded Slice Differentiator (SD) in NAS decode_nssai_ie and update
the processing logic: The SD stored in the allowed S-NSSAI list was hardcoded
in the decoding function, however this IE is not mandatory but optional.
Therefore, the check of the decoded message contents should take into account
the presence of the field in the received message and in that scenario, check
the stored value against the one from the UICC. If no SD was received, consider
the UICC SD a valid one.
- Cleanup and other fixes to decode_registration_accept: (1) adopt byte array
(2) move registration result enc/dec to registration accept library (3) check
on buffer lengths (4) add defines whenever necessary (5) simplify the code
Jaroslava Fiedlerova
94e82200e3