OpenBSC August 2016

openbsc@lists.osmocom.org

14 participants
32 discussions

Splitting out M3UA and MTP3 out of Open BSC into a separate library
by Arran Cudbard-Bell 20 Nov '25

20 Nov '25

Hi, Developing a module for FreeRADIUS to support EAP-SIM and EAP-AKA authentication against a HLR. The HLR we were targeting only supported a SCTP/M3UA/SCCP/TCAP/MAP stack, so we couldn't use SUA. Ripping the M3UA/MTP3 code out of OpenBSC worked surprisingly well. We ended up running the event loop in a separate thread to work around the threading issues. Unfortunately the HLR implements the ANSI variant of everything, whereas OpenBSC and supporting libraries seem to have been written to be compatible with the ITU standards. ...but the differences are fairly minor at MTP3 and SCCP layers, and i've started work on a patchset for libosmo-sccp. https://gerrit.osmocom.org/#/c/73/ Anyway, trying to gauge interest in splitting those layers out of Open BSC into a separate library, would be happy to take on M2UA as well for consistency. It would almost certainly get more projects using the code. There's very little out there even in Perl land for working with SS7. Thanks, -Arran Arran Cudbard-Bell <a.cudbardb(a)freeradius.org> FreeRADIUS Development Team FD31 3077 42EC 7FCD 32FE 5EE2 56CF 27F9 30A8 CAA2

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GPRS - local and foreign TLLIs
by Luca Melette 18 Nov '25

18 Nov '25

Hello everybody, after setting up a nanoBTS with OpenBSC/SGSN/GGSN, I had some troubles trying to connect my smartphone to the GPRS cell. Investigating the BTS-to-SGSN traffic, I saw that the frames sent by the SGSN were all marked with the same N(U) value (at LLC layer), the value was 0. With some debug, I found that the there was a mismatch in the TLLI storage, used to keep the status of attached terminals. The mentioned code is contained in gprs_llc.c, involving LL Entity functions and gprs_llc_tx_ui(). /* look-up or create the LL Entity for this (TLLI, SAPI) tuple */ lle = lle_by_tlli_sapi(msgb_tlli(msg), sapi); if (!lle) { struct gprs_llc_llme *llme; LOGP(DLLC, LOGL_ERROR, "LLC TX: unknown TLLI 0x%08x, " "creating LLME on the fly\n", msgb_tlli(msg)); llme = llme_alloc(msgb_tlli(msg)); lle = &llme->lle[sapi]; } The TX function uses the previously received TLLI to lookup for the LLE. The lle_by_tlli_sapi() performs the search, but preliminary it applies a foreign2local TLLI conversion to ensure to have a local one. Since no valid entry for the searched TLLI is found, a new one is created. And the problem is here. The new entry has the foreign TLLI. Next time the lookup fails again, and a new entry is created. This way, the counter N(U) is always reset, and the mobile do not recognize the message sequence and no attach is possible. My question is about foreign and local TLLIs. I patched the lookup, avoiding the conversion, so that the LLE is found and everything works fine... but... What is the sense of the conversion? Should the TLLI be always stored as a local one? Can this problem be solved with another foreign2local while allocating new entries? Actually, my problem has been solved with that workaround. But I'm curious to know what is the right way. Hope somebody can answer :) Thanks. Cheers, LM

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Pysim error: SW match failed
by Martin Nagy 16 Aug '25

16 Aug '25

Hi all, After buying a super Sim Kit (16 in 1) from China, I tried the reader (green PCB inside a blue transparent plastic case with a blue LED) and SIM (identified as a fakesupersim) with pysim tool. However i am getting the following error: /pySim-prog.py -n 26C3 -c 49 -x 262 -y 42 -z 1234 -j 1 -t auto Insert card now (or CTRL-C to cancel) Autodetected card type fakemagicsim Generated card parameters : > Name : 26C3 > SMSP : e1ffffffffffffffffffffffff058100945555ffffffffffff000000 > ICCID : 8949262427518313026 > MCC/MNC : 262/42 > IMSI : 262422461512085 > Ki : 7b74741a1ee14337ec23f9ab92a13648 > OPC : ccd867d60797d8d45354a51b3ef568ff Programming ... Traceback (most recent call last): File "./pySim-prog.py", line 530, in <module> card.program(cp) File "/home/nadicek/pysim/pysim/pySim/cards.py", line 231, in program self._scc.update_binary('6f30', hplmn + 'ff' * (tl-3)) File "/home/nadicek/pysim/pysim/pySim/commands.py", line 53, in update_binary return self._tp.send_apdu_checksw(pdu) File "/home/nadicek/pysim/pysim/pySim/transport/__init__.py", line 87, in send_apdu_checksw raise RuntimeError("SW match failed ! Expected %s and got %s." % (sw.lower(), rv[1])) RuntimeError: SW match failed ! Expected 9000 and got 9804. I checked mailing lists and haven’t found anybody who had similar problem with pysim. Also I have tried forcing different models of SIM, but nothing is working. Obviously I can remove this check from the script file (__init__.py in /pySim/transport), however somebody had a reason to put such condition there. I would like to ask if it is safe to remove that line of code and the purpose of that line of code. Thanks a lot and best regards Martin

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Re: Help with sccp library
by mosbah abdelkader 07 Jul '25

07 Jul '25

> I don't understand. This callback will be called with data you need to write > to the network. In case of MTP Level3 you will need to wrap that around the > msgb you got. I means: is the interaction with mtp3 layer implemented (is sending sccp data by mtp3 implemented by the library?)? Also, what about the reception of data from mtp3 layer. is that implemented in the sccp lib. I am asking these questions because I see the code of mtp3 in the lib but no significant call is present in the sccp part of the lib. Thank you for your help.

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dynamic traffic channels
by Neels Hofmeyr 20 May '25

20 May '25

On Tue, Jun 28, 2016 at 10:05:28AM +0200, Harald Welte wrote: > [translated from german] > is it certain that we switch a channel to PDCH only when > gprs mode != none? A TS can be GSM_PCHAN_TCH_F_PDCH; those are the only ones for which we send a PDCH ACT message. We send a PDCH ACT message - during init (CHANNEL OML's state changed to enabled -> send PDCH ACT), - and upon channel release ack when pchan == GSM_PCHAN_TCH_F_PDCH. So the question is, when we receive a channel release ack, could that be the PDCH release and we switch PDCH right back on by accident? No, because we only receive a chan rel ack when the *TCH/F* is being released. That is because the PDCH release is initiated "internally" from the PDCH DEACT, and thus this condition in common/rsl.c rsl_tx_rf_rel_ack() catches on, which existed before dyn PDCH: if (lchan->rel_act_kind != LCHAN_REL_ACT_RSL) { LOGP(DRSL, LOGL_NOTICE, "%s not sending REL ACK\n", gsm_lchan_name(lchan)); return 0; } In rsl_rx_rf_chan_rel() the rel_act_kind is set to LCHAN_REL_ACT_RSL, but not in the rsl_rx_dyn_pdch(). This is analogous to the ip.access way -- the ip.access nanobts replies to a PDCH DEACT with a PDCH DEACT ACK and doesn't send a separate channel release ack. Maybe we could set rel_act_kind to some new LCHAN_REL_ACT_IPAC_DYN_PDCH for clarity? (But we shouldn't actually send a release ack, to stay compatible.) Even though it works as-is, we should indeed add another flag check: - We do check the flags that no ACT/DEACT is already pending; - And we do send a PDCH DEACT only if ts->flags & TS_F_PDCH_ACTIVE; - But we would send a PDCH ACT despite ts->flags & TS_F_PDCH_ACTIVE. This should never happen, but it would make sense to ensure that. ~Neels

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Re: Profiling data of decoding EPDAN compressed bitmap
by Holger Freyther 29 Oct '16

29 Oct '16

> On 13 Jul 2016, at 12:21, Max <msuraev(a)sysmocom.de> wrote: > Hi all, > After looking at the code, I don't think reusing table implementation > would be easy - the approaches are too different as well as underlying > data structures. okay. then we will need to use the tree based version and from my point of view we should do it the following way: * Remove osmo_t4_decode (and related routines) from libosmocore (last step) * Make the tree based decoder ready in terms of the surrounding style * Adopt/Clone the osmo_t4_decode tests and move them to the PCU (as part of the commit that adds the decoder to the PCU) @Me: After the infrastructure is in the PCU I will remove osmo_t4_decode (and tests) from libosmocore @Radisys: I am afraid the tree based decoding is not ready yet and as it impacts the upcoming encoder (and other RLE code as far as I understand) let me put it here. In osmo-pcu (and all other projects) we use libtalloc for memory allocations. This means the tree should use talloc with proper parent/child allocations. This way the destructor of the decoder will also free all nodes of the tree. There should be no call to malloc/free in the PCU. Please take the tests from libosmocore and make sure they work with the new decoder. Tests are the lifeline and we need more and not less of them. The decoder needs to be robust against invalid input. search_runlen can fail but the caller doesn't check for that. Please test with invalid/truncated or broken inputs to see we don't end in a never terminating while loop. Test using unit tests. Similar the current osmo_t4_decode can return an error that is propagated back to the compressed bitmap decoding and we should have the same. Reduce code duplication. With the decoder the only difference between the if/else is if the data is filled with 0x00 or 0xFF and which table/root to use. Instead of having code clones please parameterize either by having local variables in the beginning or by calling different (inline) functions. kind regards holger

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multiple phy with osmo-trx
by Max 13 Oct '16

13 Oct '16

Hi! I've asked about it before but this seems to have been lost in communication. The question is basically how to enable multi-TRX support for osmo-bts-trx using phy/instance infrastructure similar to other bts? What I've tried so far is documented in http://projects.osmocom.org/issues/1648 but it did not result in working setup yet. In short, I'd like to configure OpenBSC with 1 BTS with 2 TRX, each with its own arfcn and set of channels. I'm running "osmo-bts-trx -t 2" and correspondingly "osmo-trx -c 2" on usrp b210. Any ideas on what's missing to make this actually work are greatly appreciated. -- Max Suraev <msuraev(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Director: Harald Welte

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Re: OsmoBTS -> libosmogsm code migration
by Vadim Yanitskiy 11 Oct '16

11 Oct '16

Hi Max, Thanks for your reply! > I think extending utils/conv_gen.py is the way to go because it will > allow us to have concise description of the convolutional codes in one > place and as close to the description in standards as possible. Ok, I will keep your opinion in my mind. > Could you specify which files exactly are you referring to? Also you can > use 'git blame' to clarify authorship. No problem, they are: - gsm0503_conv.c - gsm0503_interleaving.c - gsm0503_mapping.c - gsm0503_parity.c - gsm0503_tables.c Almost all the gsm0503_*, excluding the 'gsm0503_coding.*'. Thank you for this hint, this command is very usable! :) > I don't think library functions should do any sort of logging by itself > (unless it's a logging functions of course :) > Instead they should return clearly distinguishable values and let caller > do the logging as they see fit. I am agree with you. It's time to use return codes. Have a nice day! With best regards, Vadim Yanitskiy.

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Moving from trac to a single redmine
by Holger Freyther 25 Sep '16

25 Sep '16

Hi guys, I think some of us would like to move to redmine and start using public tickets more frequently. So in case we move there are some topics to be discussed and I would like to start with a couple of them right now. Tickets: Redmine has a global linear sequence of ticket numbers. If we move from many tracs to a single redmine we can either: * not import tickets * only import from one project * deal with changing ticket numbers In terms of installations the GMR trac is broken in regard to tickets, there are some for SDR that are probably not being fixed anytime soon, baseband might be relevant and OpenBSC is unlikely to be relevant. I don't think we have ever used ticket reference in OpenBSC commit messages so in terms of OpenBSC having changing ticket numbers would not be a big deal. E.g. we could add a custom field with the old trac number? Wiki: We have external references that should be redirected to the new place. Is there any way besides maintaining a list in the apache2/nginx configuration and making redirects as we find broken references? Can we proactively manage this? Is anybody willing to come up with a script and nginx configuration for doing this? kind regards holger

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OsmoBTS -> libosmogsm code migration
by Vadim Yanitskiy 06 Sep '16

06 Sep '16

Dear all, We recently discussed with Harald, that there is a lot of code related to GSM L1 should be migrated from OsmoBTS to libosmogsm. The reason is that it would be better to have one shared implementation of the convolutional codes, mapping, interleaving, etc., because then in near future it can be used not only from OsmoBTS, but also from OsmocomBB and even from foreign projects, such as GR-GSM. I just started to work on this direction, and found that there is already some code, related to the conventional codes, in libosmogsm. But unlike OsmoBTS, where all the tables can be found within the single file named 'gsm0503_conv.c', these tables appears in separate files during building process. So, I have several questions: 1) Which approach is better to use? To store everything in a single file or to use auto generation (utils/conv_gen.py)? 2) What about the copyright? I have not seen any license/author info at the top pf these files. Who is the author? Also, there is the 'gsm0503_coding.c' file, which uses the following external dependences: * The DL1C logging category, which isn't defined in libosmocore; * The 'osmo-bts/gsm_data.h', which includes 'openbsc/gsm_data_shared.h' as well. So, there is regarding questions: 3) Which logging category it would be better to use after migration? 4) What to do with the 'osmo-bts/gsm_data.h'? 5) I don't think, that it's a good way to require something from the OpenBSC sources during OsmoBTS build... How can we change it? With best regards, Vadim Yanitskiy.

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OpenBSC August 2016