Guido Casati 3cbf777835 fix (nas): parse UE Registration Reject and stop UE cleanly ...

The nrUE NAS task mishandled FGS_REGISTRATION_REJECT: it read the 5GMM
cause at a hardcoded offset and called exit(1) from the NAS ITTI task,
which could abort the process while PHY threads were still running.

This commit adds processing of plain/security-protected 5GMM headers,
decoding of the mandatory cause per TS 24.501 §8.2.7, set 5GMM state.

Softmodem is stopped via termination_procedure and local AS detach
(send_nas_detach_req without wait_release -> 1) RRC IDLE 2)
NR_NAS_CONN_RELEASE_IND 3) itti_wait_tasks_unblock).

Ignore duplicate rejects once termination has started.

Changes:
- Add fgmm_registration_reject enc/dec
- Add handle_registration_reject()
- Replace inline FGS_REGISTRATION_REJECT case
- Fix unprotected_allowed() for plain Registration Reject
- Add nas_lib_test round-trip (Illegal_UE / 0x03)

Note: optional IEs (T3346, T3502, EAP) not decoded, stop-on-reject
replaces 21a7f99 exit(1), full §5.5.1.2.5 procedure remains TODO.

Closes #174

Signed-off-by: Guido Casati <guido.casati@openairinterface.org>

2026-06-25 16:59:29 +02:00

..

IES

fix (NAS UE): decode FGC NAS container length as 16-bit IE

2026-05-12 16:02:15 +02:00

MSG

fix (nas): parse UE Registration Reject and stop UE cleanly

2026-06-25 16:59:29 +02:00