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Sukchan Lee ebc66942b6 amf: normalize invalid reg_type and ignore placeholder 5G-GUTI in context transfer detection 
Some UEs and fuzzing inputs may send a Registration Request with
registration_type.value set to 0. According to TS 24.501 Table 9.11.3.7.1,
unused registration-type encodings shall be interpreted by the network
as "initial registration". Without normalization, the invalid value may
propagate into subsequent logic and lead to unexpected behavior during
UE context transfer handling.

This patch normalizes registration_type.value == 0 to
OGS_NAS_5GS_REGISTRATION_TYPE_INITIAL early in
gmm_handle_registration_request() so that later procedures operate on
a valid registration type.

Additionally, improve robustness in
gmm_registration_request_from_old_amf() by ignoring placeholder
5G-GUTIs where AMF-ID and M-TMSI are zero. Some devices (and fuzzing
tools) send such values even though they do not represent a valid
previous AMF context. Treating them as actionable may incorrectly
trigger N14 UE Context Transfer attempts.

With this change, placeholder GUTIs are treated as non-actionable and
the AMF falls back to normal registration / identity procedures.

Issues: #4321
2026-03-10 16:48:22 +09:00
.github Update cifuzz 2025-02-04 21:09:20 +09:00
configs [HR] Implement handling of UE-initiated PDU Session Modification (#2194) 2025-06-30 10:07:06 +09:00
debian Release v2.7.6 2025-07-19 10:32:41 +09:00
docker docker: remove deprecated version from docker-compose.yml 2026-02-08 11:55:34 +09:00
docs Add Baicells Aurora 243 to hardware list 2026-02-01 06:54:46 +09:00
lib sbi: prevent AMF abort on malformed multipart SBI requests 2026-03-08 19:59:17 +09:00
misc Add roaming type toggle via command line (#4211) 2025-12-23 13:53:53 +09:00
src amf: normalize invalid reg_type and ignore placeholder 5G-GUTI in context transfer detection 2026-03-10 16:48:22 +09:00
subprojects Tested on FreeBSD-14.1-STABLE (#3350) 2024-08-03 21:45:52 +09:00
tests upf: Implement UE-to-UE hairpin in the GTP-U path 2026-02-26 06:07:35 +09:00
vagrant Tested on FreeBSD-14.1-STABLE (#3350) 2024-08-03 21:45:52 +09:00
webui Update to secure secrets using env 2026-01-17 10:45:03 +09:00
.clang-tidy [MISC] Add support for static code analysis 2022-07-01 21:38:47 +09:00
.dockerignore [build] Use local sources to build applications (#1583) 2022-06-19 18:18:09 +09:00
.editorconfig editorconfig: new file (#2746) 2023-11-27 22:21:35 +09:00
.gitignore .gitignore: Add install/ dir 2023-10-10 08:03:25 +09:00
LICENSE Change LICENSE to GNU AGPL v3.0 2017-12-18 10:35:54 +09:00
meson.build Release v2.7.6 2025-07-19 10:32:41 +09:00
meson_options.txt [Fuzzing] oss-fuzz support for fuzzing (#2283) 2023-05-05 17:20:11 +09:00
README.md nrf: Fix serving PLMN counter reset on NF register 2026-02-04 20:51:29 +09:00

README.md

Open5GS logo

Getting Started

Please follow the documentation at open5gs.org!

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If you find Open5GS useful for work, please consider supporting this Open Source project by Becoming a sponsor. To manage the funding transactions transparently, you can donate through OpenCollective.

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License

Support

Technical support and customized services for Open5GS are provided by NewPlane at support@newplane.io.