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2018-09-09lchan_fsm: allow late RTP release events without erroringneels/inter_bsc_hoNeels Hofmeyr1-0/+9
Change-Id: Ia463f97402b957bd13a95d18d291d1c1f006f089
2018-09-09ho fsm: handle RR HO Failure for inter-BSC outgoingNeels Hofmeyr1-0/+16
Before, this would ignore the failure and hit a timeout instead. Rather handle the event directly. Change-Id: I21c43d2907d0413ef18ec43cf27f680ebecf9e82
2018-09-09CBCH: Fix gsm_bts_get_cbch()Harald Welte1-2/+2
When the timeslot FSMs were introduced, the function gsm_bts_get_cbch() was ported to use 'pchan_is'. However, the function is called very early, before pchan_is is actually initialized. Let's make sure we're using the _configured_ channel combination when resolving where the CBCH is (if any) in the BTS. Ever since merging the timeslot FSMs and before this patch, SI4 would never indicate the presence of a CBCH. Change-Id: I6251b5f3e1180ad466e9349a1845e1b91f661c0b Related: OS#3532
2018-09-09CBCH: Fix SI4 CBCH IE generationHarald Welte1-1/+1
When a CBCH is present in the cell, SI4 contains the channel description of the CBCH. As SI4 may be generated at a time when the underlying timeslot is not configured yet, we need to generate the channel description for the _configured_ channel combination, not the currently used one. Change-Id: Idbf9b8e4b1ef0e0348580b83f91355b3236d8609 Closes: OS#3532
2018-09-09Introduce gsm48_lchan2chan_desc_as_configured()Harald Welte2-5/+20
gsm48_lchan2chan_desc_as_configured() is similar to gsm48_lchan2chan_desc(), but uses the *configured* channel combination, rather than the currently active one. Change-Id: Id4043218fb770e8420f19a4ef9428680ecdfd286 Related: OS#3532
2018-09-09gsm48_lchan2chan_desc() belongs to gsm_data.hHarald Welte2-2/+3
The function is defined in gsm_data.c, so it should be declared in gsm_data.h and not in gsm_04_08_rr.h Change-Id: I5200063fb43c857a984ea8e41a8485d796e49cde
2018-09-09cbch: Don't send cell-broadcast command on BTS without CBCH channelHarald Welte1-0/+4
Change-Id: I83d6b0b3eafd83e2c0fbdec81d9677ff0118db92
2018-09-07inter-BSC HO outgoing: fix L3 forwardingNeels Hofmeyr1-3/+2
Set msgb->l3h when composing the L3 message. Before this, the unset l3h resulted in erratic size in the RSL L3 Info IE. This likely fixes inter-BSC Handover on the outgoing side, to properly forward the RR Handover Command. Change-Id: Ice37242c90c19adbf0795618fd16fe75f0809317
2018-09-07inter-BSC HO incoming: send BSSMAP HO Complete directlyNeels Hofmeyr1-1/+1
Before Handover is fully completed, the gscon remains in an INIT state. To send back the BSSMAP Handover Complete message, use osmo_bsc_sigtran_send() directly to not thwart the message due to the gscon state. (The gscon state will change to ACTIVE right after that, once the handover FSM is done.) Change-Id: Ic48ae2bb23565015d5e2ccb56308fad09347b51a
2018-09-07SCCPlite Assignment Complete: include Speech Codec (Chosen)Neels Hofmeyr1-4/+4
Compose the Speech Codec (Chosen) IE not only for AoIP, but also for SCCPlite: place the code that assigns the codec to sc_ptr outside of the gscon_is_aoip() if scope. This way the MSC is told the chosen speech codec, which is mandatory for IP based user plane, and was missing until now. Related: OS#3528 Change-Id: Ibedade8d71a7994d25a63bc2faa2a24a10bfffa1
2018-09-07codec_pref.c: Add comment in expected switch case without breakPau Espin Pedrol1-0/+1
Change-Id: I568353f070f049003326306106dce89b35deb92f
2018-09-06assignment: remove unnecessary call to gsm0808_speech_codec_from_chan_type()Philipp Maier1-2/+0
There is a function call to gsm0808_speech_codec_from_chan_type() after an if construct that checks if we need voice and if we need it if it is related to an AoIP connection. However, at the moment we call gsm0808_speech_codec_from_chan_type() all the time, even when just figured out that we don't need to. Presumably this is a refactory leftover. Lets remove the excess function call. Change-Id: I34d9281944b36cd89ad8e1c5774f0ea80fdfadc8
2018-09-04codec_pref: Log HR2 specifically as never specifiedPau Espin Pedrol1-1/+2
Change-Id: Ia7d6545710b4bf609c2872e13dcb3b44abfc604e
2018-09-04codec_pref: Log unsupported codec name usedPau Espin Pedrol1-1/+4
Change-Id: If3ed8ba3bad7c927ed0efc908c005cd308e304e6
2018-08-29lchan: pick proper power and ta valuesNeels Hofmeyr1-6/+15
When activating an lchan, the power levels should be maximum and TA zero. Only if a new lchan is assigned within the same cell does it make sense to take over the previous power and TA levels. In LCHAN_EV_ACTIVATE: - Separate the code that copies previous encryption data. This should happen regardless of whether we're staying in the same cell or not. - For the power,TA levels, take over an old lchan's values only when it is assigning a new lchan in the same cell. Change-Id: I360b003398487fa6f934296ff03643c33ec61a35
2018-08-29cosmetic: lchan activ: drop todo commentsNeels Hofmeyr1-2/+0
Drop the todo comments about "for_conn->encr". I have intended that as an idea to store encryption info in the conn instead of the lchan, which might make sense, but there's no use in these comments. Change-Id: I47e90062c784dd7919fff3115e2bee3314b30cd5
2018-08-29cosmetic: lchan activ: no need to clear mr againNeels Hofmeyr1-2/+0
In lchan state UNUSED, on activating an lchan, we zero out the lchan->mr_ms_lv and mr_bts_lv. However, in UNUSED's onenter function, we already called lchan_reset(), clearing out the lchan completely. Drop two lines of unnecessary code. Change-Id: I8b38f222f1c8c822e8e5e776850dbc60e30e8b8d
2018-08-29fix dependency bug: include mgcp_client/, not mgcp/Neels Hofmeyr1-1/+1
In osmo_bsc_sigtran.c, instead of osmocom/mgcp/mgcp_common.h, include the same file from mgcp_client/. (mgcp_common.h is identically installed both by libosmo-mgcp and libosmo-mgcp-client, in their respective include dir.) Trying to include from mgcp/ breaks the debian package builds, since only libosmo-mgcp-client is installed as per osmo-bsc dependencies. The error was introduced by: commit d8f46c0074e6c2b3b693f48ca496d11a301d4923 "MGCP: add 'X-Osmo-IGN: C' for SCCPlite by default" change id I257ad574d8060fef19afce9798bd8a5a7f8c99fe Change-Id: I917b0c08ed91172ecb68c946aecb02c5109fcced
2018-08-29log: tweaks and more context in osmo_bsc_sigtran_send()Neels Hofmeyr1-4/+6
Change-Id: I3d51f17b0f6ceb0e5237b4d6d5252c701fc2fe6b
2018-08-29inter-BSC HO: send failure msg directlyNeels Hofmeyr1-1/+1
If inter-BSC HO failed, the conn is by definition not in an active state, and hence it makes no sense to verify the gscon FSM state before sending. Directly call osmo_bsc_sigtran_send(). Change-Id: Ic49c94462041800674fa961c4d19c0c045bfe0c0
2018-08-29log: 'sending BSSMAP HO Request ACK'Neels Hofmeyr1-0/+1
Change-Id: Ie472c32861d9c9ca9ebec0221837030ffd83c73a
2018-08-29log: lchan_rtp_fsm: add missing '\n'Neels Hofmeyr1-4/+4
Change-Id: Ifa46295ef23cf3728bc946fe27b34f0607a24c9e
2018-08-29lchan_fsm: safer 'concluded' flagNeels Hofmeyr2-8/+13
The flag lchan->activate.concluded prevents entering the lchan_on_fully_established()/lchan_on_activation_failure() more than once. So far it was checked by callers, instead place in the functions themselves. There is a potential functional change here, since during lchan_fail(), the concluded flag was set only after entering lchan_on_activation_failure(). Now it is already set at the start and prevents multiple re-entry beyond doubt. This patch is not a result of an actual observed faulty behavior, just from reading the code and seeing the slight loophole. Change-Id: I0c906438b05442d66255203eb816453b7193a6d8
2018-08-29cosmetic: lchan_fsm failure: log about state transitionsNeels Hofmeyr1-2/+9
Early on during failure, log which state transition is intended after failure handling. If such state is already reached after failure handling, do not log "state transition not permitted", but rather skip the state change and log "Already in state X". Change-Id: I81f53b38637823e62860cb773b7573bb5c21fdb0
2018-08-29lchan_fsm: lchan_fail_to(): store target state earlyNeels Hofmeyr1-1/+3
lchan_fail_to() is a macro to preserve useful source file:line information in logging. But a side effect is that its target state argument might evaluate differently at the end of the macro, if, say, the fi->state has changed. I hit such an instance on timeout of WAIT_RLL_RTP_ESTABLISH: lchan_fsm_timer_cb() calls macro lchan_fail(), which calls lchan_fail_to(lchan_fsm_on_error[fi->state]). Unlike for normal function invocation, this argument changes as fi->state changes. Since releasing the lchan_rtp_fsm already transitions the lchan fi into WAIT_RF_RELEASE_ACK, the final state change of lchan_fail_to() suddenly evaluates to the broken state instead of the intended WAIT_RF_RELEASE_ACK. Early in lchan_fail_to(), store the argument's value as of macro invocation. Change-Id: Id9bf4580a112ee5629f553a8bcb6b5b03b1c5f53
2018-08-29inter-BSC HO incoming: drop old/wrong RTP port codeNeels Hofmeyr1-17/+0
Drop nonsensical legacy code. The Circuit Identifier Code in A/SCCPlite does *not* indicate the RTP port to use. Rather, it indicates the MGW endpoint name to use when configuring the BSC's side of the MGW endpoint, and only the MGW will ever know the RTP port. Change-Id: I471bd5e5cc2a083dd37290aeaae5c334ca5f7eed
2018-08-29inter-BSC HO incoming: continue despite missing ClassmarkNeels Hofmeyr1-4/+4
3GPP mandates either Classmark Information 1 or 2 in BSSMAP Handover Request, but an SCCPlite MSC currently tested does not pass either of them. Make this missing IE a non-fatal error, continuing anyway should work out. See 3GPP TS 48.008, 3.2.1.8 HANDOVER REQUEST, where it says "Classmark Information 1 or Classmark Information 2" with note 6: "One of these two elements is sent." Change-Id: I34d64b028210b4df8652fee1a8830ec4a4e3ac11
2018-08-29neighbor_ident_vty.c: fix CI format, should be 16bitNeels Hofmeyr2-16/+16
In the 'lac-ci' and 'cgi' neighbor identity VTY parameters, fix the CI part to <0-65535>. Use 65535 as CI in the neighbor_ident.vty test to verify the range. Change-Id: Ie93bfe176b9d2d9445966e4ab0b928b9aa62a77f
2018-08-27cosmetic: neighbor_ident_vty.c: add and use common string defsNeels Hofmeyr1-12/+21
The "bts", "lac" and "lac-ci" VTY parameters and documentation are used more than once in this file. Define once and re-use. Prepares cosmetically for a fix of the CI format in upcoming Ie93bfe176b9d2d9445966e4ab0b928b9aa62a77f. Change-Id: I88a377c6d77c5f18877343f84f7a26f851a427ff
2018-08-25MGCP: add 'X-Osmo-IGN: C' for SCCPlite by defaultNeels Hofmeyr4-1/+56
Use libosmo-mgcp-client's new X-Osmo-IGN header to indicate that CallIDs are allowed to mismatch. Add VTY commands 'msc' / 'mgw x-osmo-ign call-id' and 'no mgw x-osmo-ign' to switch this behavior explicitly. For SCCPlite MSCs, unless a specific config was issued, always send 'X-Osmo-IGN: C' by default, to ignore CallID mismatches. Depends: Id7ae275ffde8ea9389270cfe3db087ee8db00b51 (osmo-mgw) Change-Id: I257ad574d8060fef19afce9798bd8a5a7f8c99fe
2018-08-23abis_nm_ipaccess_rsl_connect: Log bts and trx nrPau Espin Pedrol1-2/+2
Change-Id: I0c895a44527d5396d3dabb273e000acd86aece1c
2018-08-23Fix heap-use-after-free due to OML link destructionPau Espin Pedrol4-2/+31
ipaccess_drop_oml was being called inside an osmo_fd cb context, were -EBADF must be returned if the structure holding the osmo_fd is freed. In the middle of the path (see OS#3495 for path tree) it goes through a signal dispatch, so it's impossible to make sure we return some value to the osmo_fd cb. As a result, it is required to defer dropping the OML Link from current code path and do it through a timer. Fixes following ASan report: 20180822124927913 <0004> abis_nm.c:787 OC=RADIO-CARRIER(02) INST=(00,00,ff): CHANGE ADMINISTRATIVE STATE NACK CAUSE=Message cannot be performed 20180822124927913 <0004> osmo_bsc_main.c:186 Got CHANGE ADMINISTRATIVE STATE NACK going to drop the OML links. 20180822124927913 <0015> bts_ipaccess_nanobts.c:406 (bts=0) Dropping OML link. ... ================================================================= ==17607==ERROR: AddressSanitizer: heap-use-after-free on address 0x62e000060a68 at pc 0x7f5ea8e27086 bp 0x7ffde92b6d80 sp 0x7ffde92b6d78 READ of size 8 at 0x62e000060a68 thread T0 #0 0x7f5ea8e27085 in handle_ts1_write input/ipaccess.c:371 #1 0x7f5ea8e27085 in ipaccess_fd_cb input/ipaccess.c:391 #2 0x7f5ea9147ca8 in osmo_fd_disp_fds libosmocore/src/select.c:217 #3 0x7f5ea9147ca8 in osmo_select_main libosmocore/src/select.c:257 #4 0x555813ab79d6 in main osmo-bsc/osmo_bsc_main.c:922 #5 0x7f5ea76d02e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0) #6 0x555813ab84e9 in _start (/bin/osmo-bsc+0x34d4e9) Fixes: OS#3495 Change-Id: I7c794c763481c28e8c35dc9b11d27969e16feb3c
2018-08-22fix lchan_rtp_fsm: missing event handlingNeels Hofmeyr1-0/+13
Release and Rollback events are allowed but unhandled in states WAIT_MGW_CONFIGURED and ROLLBACK, and hence would result in an assertion. Add handling in these states. Change-Id: Iab233c592384902098644eee27bb8445fde3aa6f
2018-08-22abis_nm: Fix trailing whitespacingPau Espin Pedrol1-15/+15
Change-Id: Ia434b349e85019d2224a6f9a699058dccc6072dc
2018-08-22abis_nm: Fix heap-use-after-free in abis_nm_set_channel_attrPau Espin Pedrol1-1/+1
LOGPFOH uses the msgb through "foh", so we have to free msgb after calling it, not before. Fixes following ASAN report: 20180822120155990 DNM <0004> abis_nm.c:1889 OC=CHANNEL(03) INST=(00,01,06): Set Chan Attr (bts=0,trx=1,ts=6) ================================================================= ==16465==ERROR: AddressSanitizer: heap-use-after-free on address 0x61a00002b3f0 at pc 0x7f587f44c0db bp 0x7ffc59e31df0 sp 0x7ffc59e31de8 READ of size 1 at 0x61a00002b3f0 thread T0 #0 0x7f587f44c0da in abis_nm_dump_foh libosmocore/src/gsm/abis_nm.c:937 #1 0x561e09e1532c in abis_nm_set_channel_attr osmo-bsc/src/osmo-bsc/abis_nm.c:1892 #2 0x561e09efd269 in nm_statechg_event osmo-bsc/src/osmo-bsc/bts_ipaccess_nanobts.c:168 #3 0x561e09efd269 in bts_ipa_nm_sig_cb osmo-bsc/src/osmo-bsc/bts_ipaccess_nanobts.c:335 #4 0x7f587efb3d16 in osmo_signal_dispatch libosmocore/src/signal.c:120 #5 0x561e09e18e31 in abis_nm_rx_statechg_rep osmo-bsc/src/osmo-bsc/abis_nm.c:255 #6 0x561e09e18e31 in abis_nm_rcvmsg_report osmo-bsc/src/osmo-bsc/abis_nm.c:380 #7 0x561e09e18e31 in abis_nm_rcvmsg_fom osmo-bsc/src/osmo-bsc/abis_nm.c:778 #8 0x561e09e1dc19 in abis_nm_rcvmsg osmo-bsc/src/osmo-bsc/abis_nm.c:926 #9 0x7f587ec90cc2 in handle_ts1_read input/ipaccess.c:274 #10 0x7f587ec90cc2 in ipaccess_fd_cb input/ipaccess.c:389 #11 0x7f587efb1ca8 in osmo_fd_disp_fds libosmocore/src/select.c:217 #12 0x7f587efb1ca8 in osmo_select_main libosmocore/src/select.c:257 #13 0x561e09e049d6 in main osmo-bsc/src/osmo-bsc/osmo_bsc_main.c:922 #14 0x7f587d53a2e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0) #15 0x561e09e054e9 in _start (/bin/osmo-bsc+0x34d4e9) Fixes: OS#3494 Change-Id: I030117abfdcee387516a4dea7e1e6a9bae8055f6
2018-08-20use __FILE__, not __BASE_FILE__Neels Hofmeyr1-2/+2
The intention was to use the file's basename, but __BASE_FILE__ means "the root file that is being parsed and contains #include statements". If we had a function using __BASE_FILE__ and that was defined in an #included file, __BASE_FILE__ would indicate the first file where the #include is, and not the file where the function is defined. __BASE_FILE__ works for us because we don't ever include function definitions that log something, so __BASE_FILE__ always coincides with __FILE__ for our logging; but still __BASE_FILE__ is semantically the wrong constant. Related: OS#2740 Change-Id: Ic6d9dafc96c9d467ae53be2cd41adcf26a4e5125
2018-08-17bsc: Use libosmocore API to track osmo_signal structsPau Espin Pedrol1-2/+1
libosmocore recently had the new API introduced for this purpose. Depends: libosmocore Change-Id Id58ca18eb826b8f4183a7cf0dbb2b38cba702a09 Change-Id: Id07260635327617f8da5050af1e906891a89c530
2018-08-13doc: update mgw settings in example config filePhilipp Maier1-0/+1
The example config file lacks a default port setting for the local mgcp client port. Lets update that. Change-Id: I6b1c5097d98ec2ab97d51f99b1105db3de85c75f Related: OS#2874
2018-08-08lcls: do not LCLS call legs with different codecsPhilipp Maier3-0/+36
It is theoretically possible to LCLS two legs that use different codecs. However, this requires transcoding capabilities on the local MGW. If the local MGW lacks transcoding features such a local circuit should be avoided. Enabeling LCLS under such coditions should be optional (VTY) - Add check to avoid LCLS on different codec/rate - Add VTY-Option to optionally override the check (MGW is able to transcode) Change-Id: I157549129a40c64364dc126f67195759e5f1d60f Related: OS#1602
2018-08-07GSCON: call api of a_reset.c with msc object directlyPhilipp Maier6-39/+54
The API of a_reset.c is currently called with a pointer to struct reset_ctx. This puts the responsibility of checking the presence of msc->a.reset_fsm to the caller. It would be much more effective if the caller would check if msc->a.reset_fsm before dereferencing it. This also fixes at least one segfault that ocurrs when gscon_timer_cb() is called but no sccp connection is present yet. Therefore the pointer to bsc_msc_data would not be populated. This is now detected by a_reset.c itsself. - minor code cleanups - call a_reset.c functions with msc (struct bsc_msc_data) Change-Id: I0802aaadf0af4e58e41c98999e8c6823838adb61 Related: OS#3447
2018-08-07GSCON: avoid sending connection oriented data when not connectedPhilipp Maier1-1/+6
When no connection is present and had never existed, then conn->sccp.msc is unpopulated. However, there may be situations where osmo_bsc_sigtran_send() is executed while no connection is present. At the moment we assert on conn->sccp.msc, which would cause osmo-bsc to exit. In order to avoid this, better check conn->sccp.msc and drop the sccp message when the check is negative. - Remove assertion, add check. Change-Id: I4eaa983702224e5995a388ea9890ee04212eb569 Related: OS#3446
2018-08-07sigtran: fix memleak in osmo_bsc_sigtran_send()Philipp Maier1-1/+2
The function osmo_bsc_sigtran_send() checks if the MSC is ready by calling a_reset_conn_ready(). If it is not ready it returns with -EINVAL. The msg message buffer is not freed, so we leak memory in those edge cases. - Make sure msg is freed when MSC is not ready. - Add a comment that osmo_bsc_sigtran_send() takes ownership of msg Change-Id: Ib1ff1d20e960a356bcee276b7c1bf9c93283e7af
2018-08-01handover_fsm.c: Fix -Werror=format-security errorsHarald Welte1-4/+2
When building with -Werror=format-security, such as our OBS builds, it fails like this: [ 118s] handover_fsm.c: In function 'parse_ho_request': [ 118s] handover_fsm.c:478:4: error: format not a string literal and no format arguments [-Werror=format-security] [ 118s] gsm0808_cell_id_name(&req->cell_id_serving)); [ 118s] ^~~~~~~~~~~~~~~~~~~~ [ 118s] handover_fsm.c:489:4: error: format not a string literal and no format arguments [-Werror=format-security] [ 118s] gsm0808_cell_id_name(&req->cell_id_target)); [ 118s] ^~~~~~~~~~~~~~~~~~~~ [ 120s] cc1: some warnings being treated as errors Let's make sure we don't call sprintf() and friends without a format string. In fact, if we only want to copy a string without extra formatting, use osmo_strlcpy() or OSMO_STRLCPY_ARRAY(). Change-Id: I56cff3618f012f6b019f4fca7e2768814487137a
2018-08-01Migrate from osmo_ipa_idtag_parse() to ipa_ccm_id_resp_parse()Harald Welte1-2/+1
In libosmocore Change-ID I1834d90fbcdbfcb05f5b8cfe39bfe9543737ef8f we have introduced ipa_ccm_id_resp_parse() as a bugfixed replacement of ipa_ccm_idtag_parse(). The main difference is that the returned "value" parts now have a correct reported "length", whereas before this commit they all reported a one-byte too-long "length" for each IE. Change-Id: I7d5ab323989c13d0cc6ff05547306edb918e423f
2018-08-01gscon: use BSS-common payload types on BSS sidePhilipp Maier5-7/+37
In cases where a codec has no fixed (IANA) payload type number, a dynamically coosen payload type number is used. For the route between BSC and MSC 3GPP as designated certain payload type numbers. However, beond that, those payload type numbers may not necessarly apply. The RTP communication between BTS and BSC still might run on a completely different payload type number. libosmo-netif contains a header file which payload type numbers shall be used. Lets use those in order to signal the same payload type numbers as we actually use in the RTP packets to the MGW. Change-Id: I507a1b1446c8f140b2950d73cf737797604c1ac3 Related: OS#2728 Related: OS#3384
2018-08-01endpoint_fsm: add missing return in mgcp_pick_codecPhilipp Maier1-0/+1
The function mgcp_pick_codec is responsible to set the codec information. In cases whee the codec type can not be determined correctly it sets verb_info->codecs_len = 0, indicating to the caller that no codocs are set. However, after that it does not return, it sets an invalid codec anyway. - Add missing return to keep the no-codec setting in case of error. Change-Id: I8d1f8553357b6ad328ab1e5d4525fad0dd282a42
2018-07-28cosmetic: gscon: don't re-enter ST_CLEARINGNeels Hofmeyr1-3/+6
I often see "ERROR [ST_CLEARING] Entering ST_CLEARING not permitted!", avoid the bogus error messages by checking entering ST_CLEARING only if not in it yet. Still don't allow re-entering, to not restart the timeout. Change-Id: Ia1f171c08dcbc529f907a20eed43bf5ee3a452b3
2018-07-28cosmetic: rename osmo_bsc_api.c to gsm_08_08.cNeels Hofmeyr2-1/+1
Change-Id: I91922f557072d0fb8cfe213a8a7b50f3bb23dea0
2018-07-28cosmetic: rename bsc_api.h to gsm_08_08.hNeels Hofmeyr9-8/+8
See also I91922f557072d0fb8cfe213a8a7b50f3bb23dea0, which renames osmo_bsc_api.c to gsm_08_08.c. Change-Id: I7179eb27183ee213f8fc8d548895b67aa43dc6a2
2018-07-28cosmetic: reduce bsc_api.hNeels Hofmeyr5-25/+31
Remove as much as possible from bsc_api.h. Use '#pragma once'. Tweak head comment. BSC_API_CONN_POL_{ACCEPT,REJECT}: only user is static complete_layer3(), just use a bool return value instead. msc_connected(): only used in osmo_bsc_api.c, make static there. Instead of including gsm_data.h, declare structs opaquely, include stdint.h. codec_pref_test.c used this as indirect gsm_data.h include via osmo_bsc.h, include gsm_data.h there directly. osmo_bsc.h: instead of including bsc_api.h, declare opaque structs. gsm_04_08_rr.h: declare opaque structs to replace indirect include of gsm_data.h. Change-Id: Ia9c0f9828317236048e40ec9ecf9990592e2190a