OpenBSC May 2013

openbsc@lists.osmocom.org

18 participants
18 discussions

GPRS - local and foreign TLLIs
by Luca Melette 03 Feb '26

03 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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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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Re: Any interest for Osmocom meetings in Bavaria ?
by Dieter Spaar 11 Jun '13

11 Jun '13

So far three persons have indicated their interest to join a meeting at my place. Considering the time it takes to drive to my place, it probably makes sense to have the meeting at the weekend (either Saturday or Sunday) so that there is more time for the meeting itself. I can suggest one of the following dates for the first meeting, somewhere between 10:00 to 18:00 on each day: 25.8. (Sa) or 26.8. (Su) 1.9. (Sa) or 2.9. (Su) 8.9. (Sa) or 9.9. (Su) So please let me know when you have time and also make suggestions in which Osmocom topic you are interested in so that we can have some sort of agenda for the meeting to make best use of the time. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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SimpleHLR: A web interface for OpenBSC
by Peter Caprioli 03 Jun '13

03 Jun '13

Hello everyone, I've just finnished writing together a small web interface for the OpenBSC HLR. It allows you to modify various parameters in the database and also provides a set of functions to modify the HLR or sending SMSes in your own scripts. The project is still very alpha but it seems to work reasonably good. Feel free to give any feedback! Screenshots and source code is available on my website: https://stormhub.org/simplehlr/ -- *Best regards, Peter Caprioli*

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Using FakeBTS
by Priyanka Behl 31 May '13

31 May '13

Hi everyone, I have this 1 question: is it possible to have a complete communicating network with FakeBTS runing on 1 machine and all other processes on the other? (I have asked this question earlier but have not received any answer as yet. can somebody please care to reply, its a little urgent) Thanks and regards Priyanka

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[PATCH] rsl: fix the unaligned memory access
by Nicolas J. Bouliane 29 May '13

29 May '13

the armv5 can do 32bit/16bit reads only from the aligned address use tlv.h macro to copy data to local variable Signed-off-by: Nicolas J. Bouliane <nicolas.bouliane(a)nutaq.com> --- src/common/rsl.c | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-) diff --git a/src/common/rsl.c b/src/common/rsl.c index 9a50a33..5a1b867 100644 --- a/src/common/rsl.c +++ b/src/common/rsl.c @@ -1089,7 +1089,6 @@ static int rsl_tx_ipac_XXcx_ack(struct gsm_lchan *lchan, int inc_pt2, { struct msgb *msg; uint8_t chan_nr = gsm_lchan2chan_nr(lchan); - uint32_t *att_ip; const char *name; struct in_addr ia; @@ -1116,8 +1115,7 @@ static int rsl_tx_ipac_XXcx_ack(struct gsm_lchan *lchan, int inc_pt2, /* locally bound IP */ msgb_v_put(msg, RSL_IE_IPAC_LOCAL_IP); - att_ip = (uint32_t *) msgb_put(msg, sizeof(uint32_t)); - *att_ip = htonl(lchan->abis_ip.bound_ip); + msgb_put_u32(msg, lchan->abis_ip.bound_ip); /* locally bound port */ msgb_tv16_put(msg, RSL_IE_IPAC_LOCAL_PORT, @@ -1199,11 +1197,9 @@ static int tx_ipac_XXcx_nack(struct gsm_lchan *lchan, uint8_t cause, return -ENOMEM; if (inc_ipport) { - uint32_t *att_ip; /* remote IP */ msgb_v_put(msg, RSL_IE_IPAC_REMOTE_IP); - att_ip = (uint32_t *) msgb_put(msg, sizeof(uint32_t)); - *att_ip = htonl(lchan->abis_ip.connect_ip); + msgb_put_u32(msg, lchan->abis_ip.connect_ip); /* remote port */ msgb_tv16_put(msg, RSL_IE_IPAC_REMOTE_PORT, @@ -1248,8 +1244,8 @@ static int rsl_rx_ipac_XXcx(struct msgb *msg) struct gsm_lchan *lchan = msg->lchan; struct gsm_bts_role_bts *btsb = bts_role_bts(msg->lchan->ts->trx->bts); const uint8_t *payload_type, *speech_mode, *payload_type2; - const uint32_t *connect_ip; - const uint16_t *connect_port; + uint32_t connect_ip = 0; + uint16_t connect_port = 0; int rc, inc_ip_port = 0, port; char *name; @@ -1267,8 +1263,14 @@ static int rsl_rx_ipac_XXcx(struct msgb *msg) speech_mode = TLVP_VAL(&tp, RSL_IE_IPAC_SPEECH_MODE); payload_type = TLVP_VAL(&tp, RSL_IE_IPAC_RTP_PAYLOAD); payload_type2 = TLVP_VAL(&tp, RSL_IE_IPAC_RTP_PAYLOAD2); - connect_ip = (uint32_t *) TLVP_VAL(&tp, RSL_IE_IPAC_REMOTE_IP); - connect_port = (uint16_t *) TLVP_VAL(&tp, RSL_IE_IPAC_REMOTE_PORT); + + if (TLVP_PRESENT(&tp, RSL_IE_IPAC_REMOTE_IP)) { + connect_ip = tlvp_val32_unal(&tp, RSL_IE_IPAC_REMOTE_IP); + } + + if (TLVP_PRESENT(&tp, RSL_IE_IPAC_REMOTE_PORT)) { + connect_port = tlvp_val16_unal(&tp, RSL_IE_IPAC_REMOTE_PORT); + } if (dch->c.msg_type == RSL_MT_IPAC_CRCX && connect_ip && connect_port) inc_ip_port = 1; @@ -1350,14 +1352,14 @@ static int rsl_rx_ipac_XXcx(struct msgb *msg) /* Special rule: If connect_ip == 0.0.0.0, use RSL IP * address */ - if (*connect_ip == 0) { + if (connect_ip == 0) { struct ipabis_link *link = lchan->ts->trx->rsl_link; ia.s_addr = htonl(link->ip); } else - ia.s_addr = *connect_ip; + ia.s_addr = connect_ip; rc = osmo_rtp_socket_connect(lchan->abis_ip.rtp_socket, - inet_ntoa(ia), ntohs(*connect_port)); + inet_ntoa(ia), ntohs(connect_port)); if (rc < 0) { LOGP(DRSL, LOGL_ERROR, "%s Failed to connect RTP/RTCP sockets\n", @@ -1370,7 +1372,7 @@ static int rsl_rx_ipac_XXcx(struct msgb *msg) } /* save IP address and port number */ lchan->abis_ip.connect_ip = ntohl(ia.s_addr); - lchan->abis_ip.connect_port = ntohs(*connect_port); + lchan->abis_ip.connect_port = ntohs(connect_port); } else { /* FIXME: discard all codec frames */ -- 1.7.10.4

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Testing OpenBSC with FakeBTS
by Priyanka Behl 27 May '13

27 May '13

Hi everyone, I am trying to test Openbsc with the FakeBTS and I wanted to know if it is possible to run FakeBTS on one machine and all other processes ie osmo-nitb, gggsn, osmo-sgsn and osmo-pcu on another machine and set up communication among these? Thanks and regards Priyanka

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Error during the installation of the softBTS
by Priyanka Behl 23 May '13

23 May '13

Hi everyone, During the installation of the softBTS the following error incurred: root@ubuntu:/# aptitude install gnu-smalltalk osmo-st-openbsc-test couldn't find any package whose name or description matched "osmo-st-openbsc-test" while gnu smalltalk has been installed. can somebody help me with this? Thanks and regards Priyanka

1 0

For sale: 2 x nanoBTS 1800 and 1x nanoBTS booster 1800
by Konrad Meier 23 May '13

23 May '13

Hello, At the University of Freiburg (Germany) we have two nanoBTS 1800 and a nanoBTS booster 1800 for sale: NanoBTS Modell 139: 1500 Euro NanoBTS Modell 165G: 2500 Euro NanoBTS-Booster 1800: 1000 Euro The nanoBTS 139 needs to be unplugged if the software Open-BSC is restarted. Most likely this is only a software problem. Details for the booster are given here: http://www.proximus.com.ua/Nano_BTS_high_power_GSM_booster.html The NanoBTS-Booster package includes everything required: - Booster - Power supply - 2x cable to connect to the nanoBTS (0,5 meter) - 1x cable to the antenna (5 meter) - 1x omnidirectional antenna. 3 dBd gain / 1800 MHz The antenna is a high quality omnidirectional antenna from Procom (cxl-1800-3). Best regards Konrad Meier

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OpenBSC May 2013