osmocom-net-gprs

osmocom-net-gprs@lists.osmocom.org

507 discussions

Removing FCS from SNDCP packages
by Holger Freyther 16 May '17

16 May '17

Hi, I see that while adding decompression support dexter has fixed a bug in the sndcp code. Before the GTP-U frame would include the LLC FCS and now we do this: npdu_len = (msg->data + msg->len) - npdu - 3; What I wonder (and the commit message didn't say is) was the fragment part handled as well. The calculation is: /* make sure to subtract length of SNDCP header from 'len' */ rc = defrag_enqueue(sne, suh->seg_nr, data, len - (data - hdr)); and len is passed in from the TLV struct in gprs_llc_rcvmsg. I think the fragmented case is working okay. Shall we try to unify the length calculation to rely on the local "len" variable instead of checking msg->data+msg->len? cheers holger

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kernel-to-kernel gtp implementation
by fırat sönmez 05 May '17

05 May '17

Hi, I am currently working in a project where I was asked to implement a GTP tunnel from client to company servers. I have read through osmocom pages and tried to implement the simple network structure. I have seen from Basic testing of openGGSN page: " test GTP-U interoperability of the kernel with at least one other implementation, not just kernel-to-kernel (which currently is not supported in the kernel, as it only implements the GGSN/P-GW role) " I would not like to implement openGGSN but just linux-kernel-gtp-u implementation between two kernels. To achieve kernel-to-kernel implementation, I found sgsn patch on the internet: https://patchwork.ozlabs.org/patch/739408/ and there is already a kernel-gtp-U in osmocom. So, my basic network structure is below. [image: Satır içi resim 2] I would like make a tunnel between sgsn and ggsn. I have used libgtpnl tools to create link and then tunnel. I have added a default gateway GTP interface to route table on sgsn side, but the packets cannot reach ggsn side. Is there any detailed explanation for a simple bidirectional tunnel setup. If so, it would be so nice to know about. Thank you for all your efforts, Fırat

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Video Recordings of OsmoCon 2017
by Harald Welte 25 Apr '17

25 Apr '17

Hi all, the Osmocom Conference 2017 last week was an overwhelming success. We received lots of positive feedback from all sides. Thanks to all the speakers, to the attendees as well as to the anonymous sponsor of the travel grant funds. It is my great pleasure that due to the great support by C3VOC (The CCC Video Operation Center), we have full recordings of all talks given at OsmoCon 2017. You can find the videos on the C3VOC site at https://media.ccc.de/search/?q=osmocon They are also linked individually from the OsmoCon 2017 homepage at https://osmocom.org/projects/osmo-dev-con/wiki/OsmoCon2017 I hope the video recordings will be of help for everyone who could not make it to the event in person. We will also be collecting the slides and put them up on the wiki during the next few days. Please don't hesitate to raise any feedback and/or questions. Technical feedback/questions regarding Osmocom software / projects should be addressed to the appropriate mailing lists, such as openbsc(a)lists.osmocom.org. Feedback to the organizers should be sent to osmocon2017(a)sysmocom.de. Looking forward to the next OsmoCon, which we'll expect to be spanning ore than just a single day. Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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kernel GTP-U support dev roadmap
by Jiannan Ouyang 24 Apr '17

24 Apr '17

Hi Harald and Andreas, I’m writing to inquiry about the development roadmap of the kernel gtp module. For example, is there any plan to support the following features soon - lightweight tunnel - ipv6 The openair-cn project I’m working on is a user of the kernel gtp module. I’m happy to help improve the kernel gtp support, so it’s good to first ask about the roadmap. Regards, -Jiannan

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GTP echo response
by Alandre de Carvalho 05 Apr '17

05 Apr '17

Hi everyone, We're using kernel GTP developed by Osmocom on openair-cn. Turns out that we are not able to connect an UE for longer than 20 seconds using an ZTE eNB apparently because the GTP-U is not answering to the echo requests. As far I know this response is supposed to be implemented but it is not answering. Do you guys have any tips on this issue? Thanks in advance, Alandre

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allow gtp tunnel updating in libgtpnl: gtp_add_tunnel()
by Jiannan Ouyang 29 Mar '17

29 Mar '17

Hi All, In current OAI implementation, we found that there are cases SPGW is out-of-sync with MME, because of the delete_session_request is not received by the SPGW because of some errors, however MME has cleared the state of that session. Then when the UE re-attaches, a new create_session_request is sent to SPGW; and because we try to allocate the same IP for the same IMSI (local change), the SPGW will result out in trying to update an existing GTP tunnel. According to http://lxr.free-electrons.com/source/drivers/net/gtp.c#L937 and https://github.com/RoadRunnr/osmo-ggsn/blob/master/libgtnl/src/gtp-genl.c#L…, the NLM_F_EXCL flag is used to prevent updating an existing tunnel. I’m is wondering what is the reason of preventing updating? While we are actively investigating sending delete_session_request properly, as temporary workaround, I’m thinking to recovery from the out-of-sync problem, we can allow the new GTP tunnel to overwrite the old one in libgtpnl. Your suggestions are welcomed. Thanks. Regards, -Jiannan

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Updates on Osmocom Conference 2017
by Harald Welte 27 Mar '17

27 Mar '17

OsmoCon 2017 updates There are some updates related to OsmoCon2017, the first Osmocom Conference, held on April 21st, 2017 in Berlin, Germany. See http://osmocom.org/news/68 for the web version of this announcement. == Summary == Summary (for those too busy to read the full post): * Schedule of talks has been released http://osmocom.org/projects/osmo-dev-con/wiki/OsmoCon2017#Schedule * Travel Grants available for participants who are otherwise unable to travel to Berlin: http://osmocom.org/projects/osmo-dev-con/wiki/OsmoCon2017_TravelGrants * Social Event details available, including menu: http://osmocom.org/projects/osmo-dev-con/wiki/OsmoCon2017_SocialEvent * April 21st is approaching fast, make sure you get your Ticket in time. Limited number of seats available http://shop.sysmocom.de/products/ticket-for-osmocon-2017 == Details == === Schedule has been released === The list of talks with their abstracts has been on the website for quite some time, but now we actually have put together a schedule based on those talks. Please see http://osmocom.org/projects/osmo-dev-con/wiki/OsmoCon2017#Schedule for the schedule. As you can see, the day is fully packed with talks about Osmocom cellular infrastructure projects. We had to cut some talk slots short (30min instead of 45min), but I'm confident that it is good to cover a wider range of topics, while at the same time avoiding fragmenting the audience with multiple tracks. === Travel Grants === We are happy to announce that we have received donations to permit for providing travel grants! This means that any attendee who is otherwise not able to cover their travel to OsmoCon 2017 (e.g. because their interest in Osmocom is not related to their work, or because their employer doesn't pay the travel expenses) can now apply for such a travel grant. For more details see http://osmocom.org/projects/osmo-dev-con/wiki/OsmoCon2017_TravelGrants and/or constact osmocon2017(a)sysmocom.de. === Social Event === Tech Talks are nice and fine, but what many people enjoy even more at conferences is the informal networking combined with good food. For this, we have the social event at night, which is open to all attendees. See more details about it at http://osmocom.org/projects/osmo-dev-con/wiki/OsmoCon2017_SocialEvent -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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[osmo-pcu 0.2.896-0a8f] testsuite: 4 failed
by Arnaud ZANETTI 27 Mar '17

27 Mar '17

Hi, building osmo-pcu on a raspberry Pi 3, I noticed a failure in make check: ## --------------------------------- ## ## osmo-pcu 0.2.896-0a8f test suite. ## ## --------------------------------- ## Regression tests 1: rlcmac ok 2: ts_alloc ok 3: tbf ok 4: bitcomp FAILED (testsuite.at:30) 5: edge ok 6: types ok 7: ms ok 8: llc ok 9: llist ok 10: codel ok 11: fn ok ## ------------- ## ## Test results. ## ## ------------- ## ERROR: All 11 tests were run, 1 failed unexpectedly. ## -------------------------- ## ## testsuite.log was created. ## ## -------------------------- ## The exact same test also fails on a raspberry Pi 2, with the same osmo-pcu and gcc versions but succeeds on an old Pentium4 Feel free to contact me if you need further informations. ----- Arnaud ZANETTI

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[PATCH 0/2] libgtpnl patches
by Jonas Bonn 24 Mar '17

24 Mar '17

Here are two small patches for libgtpnl. They both apply to the laforge/sgsn-role branch (although patch 2/2 could be taken separately into the main branch, too). Patch 1/2 is a small fixup for a netlink parameter rename in a kernel patch. Patch 2/2 is a trivial include file addition to prevent some warnings. Jonas Bonn (2): Rename netlink attribute Provide declaration for struct in_addr include/libgtpnl/gtp.h | 1 + include/linux/gtp.h | 2 +- src/gtp-genl.c | 8 ++++---- 3 files changed, 6 insertions(+), 5 deletions(-) -- 2.9.3

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git.osmocom.org cgit improvements
by Harald Welte 20 Mar '17

20 Mar '17

Hi all, today I've deployed some cgit improvements on https://git.osmocom.org/, in the hope that it makes this tool even more useful: 1) syntax highlighting of source code (requested by Hoernchen) The source code is now highlighted by pygments. I don't really understand why somebody would want to look at source code a lot in a browser, but well, it was as easy as to enable the existing pygments based filter plugin. 2) rendering of "about" page from README.md As you might have noticed, I've introduced a README.md in a number of repositoires, and cgit is now rendering an about page for every repository, e.g. at http://git.osmocom.org/libosmo-abis/about/ 3) gerrit change-ID hyperlink generation All gerrit Change-IDs in commit messages are now automatically converted to hyperlinks to the respective gerrit change, see e.g. the below example: http://git.osmocom.org/openbsc/commit/?id=6dd0fc685b7149f67a5fe17a5bce55c44… Please note that this works for the "Change-Id" line of the actual change, but also for change-ids in the free text (e.g. "this depends on change-id ... in libosmocore") 4) Osmocom ticket/issue hyperlink generation Any Line that matches the "^((Relate|Close|Fixe)[ds]):" prefix is scanned for occurrences of "OS#(\d+)" which are then amended with hyperlinks to the respective issue on osmocom.org Please note the OS# prefix is mandatory, so things like "OS#1614, 1615" will not work, as can be seen at http://git.osmocom.org/osmo-pcu/commit/?id=0a8fae8d141c2cfa4387ffe9b35402d5… Please format your commit messages accordingly. Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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