April 2011 - OpenBSC - lists.osmocom.org

GPRS - local and foreign TLLIs
by Luca Melette 04 Feb '26

04 Feb '26

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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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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Several questions
by jason mercury 06 Dec '12

06 Dec '12

I have some questions: 1) When I start bsc_hack bsc_init.c first establishes OML link and initializes the bts then it establishes RSL link and bts starts broadcasting. However, it takes so much time to start the bts. Instead of this I want to do the following: it establishes OML link at the beginning and only once, then when i want to start broadcasting it establishes just the RSL link and bts will start faster since i don't have to wait for OML link. What should be done for this? 2) If i send one or two word messages from telnet interface it is okay. But if i send a longer message the phone could't receive the end of the message correctly(last words may be incomplete). Did any one encounter with this problem? What is wrong with me? 3) Could I send SMS in which extension of the sender is text not integer. For example, i want to send an information SMS that this is a test network. For this purpose i want to send an SMS from 'OpenBSC'. I set the extension of the first subscriber in database as text and tried to send the SMS but SMS wasn't delivered. What should i do? 4) Can i add SMS externally to SMS table of database? Thanks. Jason

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sms bugfix
by Dennis Wehrle 25 Jul '11

25 Jul '11

Hello Our goal was to send status sms via the vty interface. But all of our sms were cropped. In contrast sms from one MS to another MS are displayed correctly (despite the fact, that the text at the database contains several '@' at the end / the user_data contains several zero-octets). Therefore i have inspect the code and found several bugs. The main problem is that the "user_data_len" is not correctly used. As per GSM 03.40, 9.2.3.16 TP‑User‑Data‑Length (TP‑UDL): "If the TP‑User‑Data is coded using the GSM 7 bit default alphabet, the TP‑User‑Data‑Length field gives an integer representation of the number of septets within the TP‑User‑Data field to follow." Currently the "user_data_len" contains the number of octets (returned from gsm_7bit_encode(...) at gsm_utils.c (libosmocore)). The big problem here is that this information is not unique, e.g.: 1.) 46 non-extension characters + 1 extension character => (46 * 7 bit + (1 * (2 * 7 bit))) / 8 bit = 42 octets 2.) 47 non-extension characters => (47 * 7 bit) / 8 bit = 41,125 = 42 octets 3.) 48 non-extension characters => (48 * 7 bit) / 8 bit = 42 octects But the MS has to know the correct "user_data_len" to decode the correct number of characters. For this reason i updated the gsm_7bit_encode() function to return the correct number of septets. However sometimes it is needed to know the correct number of octets (e.g. at gsm_04_11.c: gsm340_gen_tpdu(...)) => i added a function to gsm_utils.c named: uint8_t get_octet_len(const uint8_t sept_len) I have also fixed the problem, that the sms are wrongly stored / displayed on the database. But the solution on the function *sms_from_result(...) (at db.c) is not really "beautiful". This is because there exists no "user_data_len" field at the database. To store the right value for "user_data_len" (which is further needed) i have to get the length from the "text" field. Unfortunately this is not enough. If the text contains extension characters like {[]} etc. then the "user_data_len" has to be bigger because these characters needs two septets. Therefore i use a switch statement so search for these characters. A better solution for that is to store the right "user_data_len" to the database (on the encoding / decoding procedure). But i don't know if this is a suitable solution for all of you (because you have to change your database structure etc.). Best Regards Dennis Wehrle

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Licensing of the wiki
by Harald Welte 13 Jul '11

13 Jul '11

Hi all, so far we do not have any statement about the licensing of the content on our wiki. This means the default copyright rules apply: All the content is copyrighted, and nobody has any rgiht to reproduce it at all. I would like to propose an official license for the content in the wiki: Create Commons CC-BY-SA. The alternative would be to go for CC-BY-NC-SA, disallowing commercial use of the content. I'm not certain if NC is really what we want. After all, even somebody using OpenBSC in a commercial environment should be able to make copies of the reference documentation we have available - as long as he will releas the result again (which the SA part already covers). If the major contributors to the wiki would agree to a license, I would update the wiki accordingly. Thanks, 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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[PATCH 0/3] new VTY commands to enable IPA proxy
by pablo＠gnumonks.org 23 May '11

23 May '11

From: Pablo Neira Ayuso <pablo(a)gnumonks.org> Hi! This patchset adds new VTY commands that allows to route IPA flows. Patch 3/3 includes one feature that changes the current default behaviour of OpenBSC since you explicity have to make a "ipa setup" to enable OML and RSL links. If you like it, I can make a similar patch for HSL femto, so the only initial open socket is the one at port 4242 for telnet configuration. BTW, the original command syntax was proposed by Harald. Successfully tested bootstrapping the nanoBTS. See the patches for more details. Comments welcome! Pablo Neira Ayuso (3): libcommon: add make_sock_stream_connect() libabis: add VTY commands to route IPA flows libabis: add IPA VTY command to setup ip.access nanoBTS OML and RSL links openbsc/include/openbsc/ipaccess.h | 3 + openbsc/include/openbsc/socket.h | 2 + openbsc/include/openbsc/vty.h | 1 + openbsc/src/ipaccess/Makefile.am | 4 +- openbsc/src/libabis/Makefile.am | 2 +- openbsc/src/libabis/e1_input.c | 2 + openbsc/src/libabis/input/ipaccess.c | 962 +++++++++++++++++++++++++++++- openbsc/src/libbsc/bsc_vty.c | 1 + openbsc/src/libcommon/socket.c | 54 ++ openbsc/src/openbsc.cfg.ipa-proxy | 18 + openbsc/src/openbsc.cfg.nanobts | 3 + openbsc/src/openbsc.cfg.nanobts.multitrx | 3 + openbsc/tests/db/Makefile.am | 5 +- 13 files changed, 1043 insertions(+), 17 deletions(-) create mode 100644 openbsc/src/openbsc.cfg.ipa-proxy -- 1.7.2.3

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TODO: openbsc.cfg console logging options
by Harald Welte 29 Apr '11

29 Apr '11

Hi Pablo! I've recently received a bug report that somehow the config-file-stored configuration of which log levels/subsystems to enable on stderr don't work. This may be related to the legacy "-d DINP:DNM:... style log level specifications, e.g. we first read the config file and then set some default logging options usign the legacy version. Maybe you can find some time to investigate and fix the issue. Thanks in advance, 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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problems with pysim-prog
by Pablo Neira Ayuso 29 Apr '11

29 Apr '11

Hi! I'm experiencing problems with pysim-prog. Using the example available in the README file. # ./pySim-prog.py -n 26C3 -c 49 -x 262 -y 42 -z lila -j 0 Insert card now (or CTRL-C to cancel) I get stuck here forever. The same message shows if I remove the supersim card from the reader. Running pysim inside strace shows: write(1, "Insert card now (or CTRL-C to cancel)\n", 38) = 38 ioctl(3, TIOCMBIS, [TIOCM_RTS]) = 0 select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout) ioctl(3, TCFLSH, 0) = 0 ioctl(3, TIOCMBIC, [TIOCM_RTS]) = 0 select(4, [3], [], [], {1, 0}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 500000}) = 0 (Timeout) ioctl(3, TIOCMBIS, [TIOCM_RTS]) = 0 select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout) ioctl(3, TCFLSH, 0) = 0 ioctl(3, TIOCMBIC, [TIOCM_RTS]) = 0 ... [and so on] The pl2303 module is loaded correctly, and I have used it before to access some embedded devices via serial line: pl2303 2-2:1.0: pl2303 converter detected usb 2-2: pl2303 converter now attached to ttyUSB0 usb 2-2: USB disconnect, device number 11 pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0 Any clue on what's wrong? Thanks!

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Your http://openbsc.mciroembedded.com/ site
by Harald Welte 27 Apr '11

27 Apr '11

Hi "Mr. Unknown", it has come to my attention that you are running a copy of our OpenBSC website (http://openbsc.osmocom.org/) at http://openbsc.microembedded.com/ We appreciate your enthusiasm for OpenBSC and like to thank you for your work on the Chinese translation. However, it would have been good to coordinate about this with us. Making a copy of the website as a sub-domain to your company "MicroEmbedded" may seem to some people as if you were representing the OpenBSC project (which you are not), or that OpenBSC is somehow a work of your MicroEmbedded company. After some checking, it seems that the final line on each page "注： BscHack （英文原文出处，以上翻译整理仅供 OpenBSC 爱好者参考! email: support(a)microembedded.com ）" provides a link to the orignal page at bs11-abis.gnumonks.org. Once again in this link you provide your e-mail address, followed by the company footer of your web-page. The contents of the OpenBSC website has copyright, and we do not think it is appropriate for you to associate your company in this way with OpenBSC. You are not a member of the project, you have not contributed to the OpenBSC software, and you have not contacted us about obtainign permission to make such a translated copy. Furthermore, there are several problems with your website: 1) it is out of date, as you have used a very old version of the OpenBSC website to translate. As a result, quite some of your links back to the original OpenBSC site are broken. 2) You have introduced capitalization changes like "$ Sqlite" which will not work, as the command is "$ sqlite" If your intentions in running a translated OpenBSC site are honest, I would like to invite you to do so in working together with us. We can provide you with the respective space on the official homepage, and you can contribute your translated content there. In return, we may put a "thank you" link to microembedded.com in the Thanks section at http://openbsc.osmocom.org/trac/wiki#Thanks We hope this is acceptable to you. In any case, we hope you can understand that we will not tolerate you putting your company name next to a copy of the OpenBSC wiki. 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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[PATCH] include: fix missing extern in osmo_panic* declarations
by pablo＠gnumonks.org 26 Apr '11

26 Apr '11

From: Pablo Neira Ayuso <pablo(a)gnumonks.orgt> This patch adds the missing extern to osmo_panic* declarations. --- include/osmocom/core/panic.h | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/include/osmocom/core/panic.h b/include/osmocom/core/panic.h index c5a8377..c28a844 100644 --- a/include/osmocom/core/panic.h +++ b/include/osmocom/core/panic.h @@ -5,7 +5,7 @@ typedef void (*osmo_panic_handler_t)(const char *fmt, va_list args); -void osmo_panic(const char *fmt, ...); -void osmo_set_panic_handler(osmo_panic_handler_t h); +extern void osmo_panic(const char *fmt, ...); +extern void osmo_set_panic_handler(osmo_panic_handler_t h); #endif -- 1.7.2.3

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