868d818e6e
If an MS which had an MMCTX at the SGSN sent RAU update with an unexpected Old RA field, the RAU was rejected and LLME (LLC layer) unassigned (freed), because no MMCTX was found matching the wrong old RA. However, an MMCTX may actually exist pointing to that LLME, and hence when the LLME is freed, it stayed unnoticed with a dangling pointer to the freed LLME in ctx->gb.llme. Let's try to harder to avoid this kind of bugs which make osmo-sgsn crash. Once we properly split the code into separate independent layers (LLC, MMCTX, etc.) each holding their own structs, this kind of bugs shouldn't happen anymore. Related: OS#6441 Change-Id: I5a4328c6e945b85dd815215724feecadba59c435
osmo-sgsn - Osmocom SGSN Implementation
This repository contains a C-language implementation of a Serving GPRS Support Node (SGSN) for 2.5/2.75G (GPRS/EDGE) and 3G (UMTS). It is part of the Osmocom Open Source Mobile Communications project.
OsmoSGSN exposes
- Gb towards PCUs (e.g. OsmoPCU): Various GbIP flavors + Gb/FR/E1
- GTP towards a GGSN (e.g. OsmoGGSN)
- IuPS over IP towards RNCs / HNBGW (e.g. osmo-hnbgw)
- The Osmocom typical telnet VTY and CTRL interfaces.
- The Osmocom typical statsd exporter.
- GSUP (custom MAP-like protocol) towards osmo-hlr
OsmoSGSN implements
- GPRS mobility management
- GPRS session management
Homepage
You can find the OsmoSGSN homepage online at https://osmocom.org/projects/osmosgsn/wiki.
GIT Repository
You can clone from the official osmo-sgsn.git repository using
git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-sgsn
There is a web interface at https://gitea.osmocom.org/cellular-infrastructure/osmo-sgsn
Documentation
User Manuals and VTY reference manuals are [optionally] built in PDF form as part of the build process.
Pre-rendered PDF version of the current "master" can be found at User Manual as well as the VTY Reference Manual
Forum
We welcome any osmo-sgsn related discussions in the Cellular Network Infratructure -> 2G/3G Core Network. section of the osmocom discourse (web based Forum).
Mailing List
Discussions related to osmo-sgsn are happening on the osmocom-net-gprs@lists.osmocom.org mailing list, please see https://lists.osmocom.org/postorius/lists/osmocom-net-gprs.lists.osmocom.org/ for subscription options and the list archive.
Please observe the Osmocom Mailing List Rules when posting.
Issue Tracker
We use the issue tracker of the osmo-sgsn project on osmocom.org for tracking the state of bug reports and feature requests. Feel free to submit any issues you may find, or help us out by resolving existing issues.
Contributing
Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards
We use a Gerrit based patch submission/review process for managing contributions. Please see https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for more details
The current patch queue for osmo-sgsn can be seen at https://gerrit.osmocom.org/#/q/project:osmo-sgsn+status:open
History
OsmoSGSN originated from the OpenBSC project, as a separate program within openbsc.git. In 2017, OpenBSC was split in separate repositories, and hence OsmoSGSN was given its own separate git repository.