2018-07-13 07:17:07 +00:00
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/*
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* (C) 2017-2018 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Philipp Maier
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <osmocom/core/msgb.h>
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2019-04-23 16:37:37 +00:00
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#include <osmocom/mgcp_client/mgcp_client_fsm.h>
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#include <osmocom/netif/rtp.h>
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2018-09-04 09:45:58 +00:00
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#include <osmocom/gsm/protocol/gsm_08_08.h>
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2018-07-13 07:17:07 +00:00
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#include <osmocom/gsm/gsm0808_utils.h>
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#include <osmocom/bsc/bsc_msc_data.h>
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#include <osmocom/bsc/codec_pref.h>
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2018-07-13 14:14:18 +00:00
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#include <osmocom/bsc/gsm_data.h>
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2020-07-15 18:53:16 +00:00
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#include <osmocom/bsc/bts.h>
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2018-07-13 07:17:07 +00:00
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2018-10-10 08:42:43 +00:00
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/* Determine whether a permitted speech value is specifies a half rate or full
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* rate codec */
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static int full_rate_from_perm_spch(bool * full_rate,
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enum gsm0808_permitted_speech perm_spch)
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{
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/* Check if the result is a half or full rate codec */
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switch (perm_spch) {
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case GSM0808_PERM_HR1:
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case GSM0808_PERM_HR2:
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case GSM0808_PERM_HR3:
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case GSM0808_PERM_HR4:
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case GSM0808_PERM_HR6:
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*full_rate = false;
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break;
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case GSM0808_PERM_FR1:
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case GSM0808_PERM_FR2:
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case GSM0808_PERM_FR3:
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case GSM0808_PERM_FR4:
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case GSM0808_PERM_FR5:
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*full_rate = true;
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break;
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default:
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LOGP(DMSC, LOGL_ERROR, "Invalid permitted-speech value: %u\n",
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perm_spch);
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return -EINVAL;
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}
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return 0;
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}
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2023-01-27 09:39:18 +00:00
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/* Look up a matching chan mode for a given permitted speech value */
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large refactoring: use FSMs for lchans; add inter-BSC HO
Add FSMs:
- timeslot_fsm: handle dynamic timeslots and OML+RSL availability.
- lchan_fsm: handle an individual lchan activation, RTP stream and release,
signal the appropriate calling FSMs on success, failure, release.
- mgw_endpoint_fsm: handle one entire endpoint with several CI.
- assignment_fsm: BSSMAP Assignment Request.
- handover_fsm: all of intra, inter-MO and inter-MT handover.
Above FSMs absorb large parts of the gscon FSM. The gscon FSM was surpassing
the maximum amount events (32), and it is more logical to treat assignment,
handover and MGW procedures in separate FSMs.
- Add logging macros for each FSM type:
- LOG_TS()
- LOG_LCHAN()
- LOG_MGWEP(), LOG_CI()
- LOG_ASSIGNMENT()
- LOG_HO()
These log with the osmo_fsm_inst where present.
New style decision: logging without a final newline char is awkward,
especially for gsmtap logging and when other logs interleave LOGPC() calls;
we have various cases where the final \n goes missing, and also this invokes
the log category checking N times instead of once.
So I decided to make these macros *always* append a newline, but only if
there is no final newline yet. I hope that the compiler optimizes the
strlen() of the constant format strings away. Thus I can log with or without
typing "\n" and always get an \n termination anyway.
General:
- replace osmo_timers, state enums and program-wide osmo_signal_dispatch()
with dedicated FSM timeouts, states and events.
- introduce a common way to handle Tnnn timers: gsm_timers.h/.c: struct T_def.
These can be used (with some macro magic) to define a state's timeout once,
and not make mistakes for each osmo_fsm_inst_state_chg().
Details:
bsc_subscr_conn_fsm.c:
- move most states of this FSM to lchan_fsm, assignment_fsm, handover_fsm and
mgw_endpoint_fsm.
- There is exactly one state for an ongoing Assignment, with all details
handled in conn->assignment.fi. The state relies on the assignment_fsm's
timeout.
- There is one state for an ongoing Handover; except for an incoming Handover
from a remote BSS, the gscon remains in ST_INIT until the new lchan and conn
are both established.
- move bssmap_add_lcls_status() to osmo_bsc_lcls.c
abis_rsl.c:
- move all dynamic timeslot logic away into timeslot_fsm. Only keep plain send/receive functions in
abis_rsl.c
- reduce some rsl functions to merely send a message, rename to "_tx_".
- rsl_ipacc_mdcx(): add '_tx_' in the name; move parts that change the lchan state out into the
lchan_fsm, the lchan->abis_ip.* are now set there prior to invoking this function.
- move all timers and error/release handling away into various FSMs.
- tweak ipa_smod_s_for_lchan() and ipa_rtp_pt_for_lchan() to not require an
lchan passed, but just mode,type that they require. Rename to
ipacc_speech_mode*() and ipacc_payload_type().
- add rsl_forward_layer3_info, used for inter-BSC HO MO, to just send the RR
message received during BSSMAP Handover Command.
- move various logging to LOG_LCHAN() in order to log with the lchan FSM instance.
One drawback is that the lchan FSM is limited to one logging category, i.e. this moves some logging
from DRR to DRSL. It might actually make sense to combine those categories.
- lose LOGP...LOGPC logging cascades: they are bad for gsmtap logging and for performance.
- handle_classmark_chg(): change logging, move cm2 len check out of the cm3 condition (I hope that's
correct).
- gsm48_send_ho_cmd(): split off gsm48_make_ho_cmd() which doesn't send right away, so that during
inter-bsc HO we can make an RR Handover Command to send via the MSC to the remote BSS.
assignment_fsm.c:
- the Chan Mode Modify in case of re-using the same lchan is not implemented
yet, because this was also missing in the previous implementation (OS#3357).
osmo_bsc_api.c:
- simplify bsc_mr_config() and move to lchan_fsm.c, the only caller; rename to
lchan_mr_config(). (bsc_mr_config() used to copy the values to mr_bts_lv
twice, once by member assignment and then again with a memcpy.)
- During handover, we used to copy the MR config from the old lchan. Since we
may handover between FR and HR, rather set the MR Config anew every time, so
that FR rates are always available on FR lchans, and never on HR lchans.
Depends: I03ee7ce840ecfa0b6a33358e7385528aabd4873f (libosmocore),
I1f2918418c38918c5ac70acaa51a47adfca12b5e (libosmocore)
Change-Id: I82e3f918295daa83274a4cf803f046979f284366
2018-05-14 16:14:15 +00:00
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static enum gsm48_chan_mode gsm88_to_chan_mode(enum gsm0808_permitted_speech speech)
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2018-07-13 07:17:07 +00:00
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{
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switch (speech) {
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case GSM0808_PERM_HR1:
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case GSM0808_PERM_FR1:
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return GSM48_CMODE_SPEECH_V1;
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break;
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case GSM0808_PERM_FR2:
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return GSM48_CMODE_SPEECH_EFR;
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break;
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case GSM0808_PERM_HR3:
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case GSM0808_PERM_FR3:
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return GSM48_CMODE_SPEECH_AMR;
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break;
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2018-09-04 09:50:10 +00:00
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case GSM0808_PERM_HR2:
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LOGP(DMSC, LOGL_FATAL, "Speech HR2 was never specified!\n");
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2018-09-05 12:04:18 +00:00
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/* fall through */
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2018-07-13 07:17:07 +00:00
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default:
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2018-09-04 09:45:58 +00:00
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LOGP(DMSC, LOGL_FATAL, "Unsupported permitted speech %s selected, "
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"assuming AMR as channel mode...\n",
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gsm0808_permitted_speech_name(speech));
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2018-07-13 07:17:07 +00:00
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return GSM48_CMODE_SPEECH_AMR;
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}
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}
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2023-01-27 09:39:18 +00:00
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/* Look up a matching permitted speech value for a given msc audio codec pref */
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large refactoring: use FSMs for lchans; add inter-BSC HO
Add FSMs:
- timeslot_fsm: handle dynamic timeslots and OML+RSL availability.
- lchan_fsm: handle an individual lchan activation, RTP stream and release,
signal the appropriate calling FSMs on success, failure, release.
- mgw_endpoint_fsm: handle one entire endpoint with several CI.
- assignment_fsm: BSSMAP Assignment Request.
- handover_fsm: all of intra, inter-MO and inter-MT handover.
Above FSMs absorb large parts of the gscon FSM. The gscon FSM was surpassing
the maximum amount events (32), and it is more logical to treat assignment,
handover and MGW procedures in separate FSMs.
- Add logging macros for each FSM type:
- LOG_TS()
- LOG_LCHAN()
- LOG_MGWEP(), LOG_CI()
- LOG_ASSIGNMENT()
- LOG_HO()
These log with the osmo_fsm_inst where present.
New style decision: logging without a final newline char is awkward,
especially for gsmtap logging and when other logs interleave LOGPC() calls;
we have various cases where the final \n goes missing, and also this invokes
the log category checking N times instead of once.
So I decided to make these macros *always* append a newline, but only if
there is no final newline yet. I hope that the compiler optimizes the
strlen() of the constant format strings away. Thus I can log with or without
typing "\n" and always get an \n termination anyway.
General:
- replace osmo_timers, state enums and program-wide osmo_signal_dispatch()
with dedicated FSM timeouts, states and events.
- introduce a common way to handle Tnnn timers: gsm_timers.h/.c: struct T_def.
These can be used (with some macro magic) to define a state's timeout once,
and not make mistakes for each osmo_fsm_inst_state_chg().
Details:
bsc_subscr_conn_fsm.c:
- move most states of this FSM to lchan_fsm, assignment_fsm, handover_fsm and
mgw_endpoint_fsm.
- There is exactly one state for an ongoing Assignment, with all details
handled in conn->assignment.fi. The state relies on the assignment_fsm's
timeout.
- There is one state for an ongoing Handover; except for an incoming Handover
from a remote BSS, the gscon remains in ST_INIT until the new lchan and conn
are both established.
- move bssmap_add_lcls_status() to osmo_bsc_lcls.c
abis_rsl.c:
- move all dynamic timeslot logic away into timeslot_fsm. Only keep plain send/receive functions in
abis_rsl.c
- reduce some rsl functions to merely send a message, rename to "_tx_".
- rsl_ipacc_mdcx(): add '_tx_' in the name; move parts that change the lchan state out into the
lchan_fsm, the lchan->abis_ip.* are now set there prior to invoking this function.
- move all timers and error/release handling away into various FSMs.
- tweak ipa_smod_s_for_lchan() and ipa_rtp_pt_for_lchan() to not require an
lchan passed, but just mode,type that they require. Rename to
ipacc_speech_mode*() and ipacc_payload_type().
- add rsl_forward_layer3_info, used for inter-BSC HO MO, to just send the RR
message received during BSSMAP Handover Command.
- move various logging to LOG_LCHAN() in order to log with the lchan FSM instance.
One drawback is that the lchan FSM is limited to one logging category, i.e. this moves some logging
from DRR to DRSL. It might actually make sense to combine those categories.
- lose LOGP...LOGPC logging cascades: they are bad for gsmtap logging and for performance.
- handle_classmark_chg(): change logging, move cm2 len check out of the cm3 condition (I hope that's
correct).
- gsm48_send_ho_cmd(): split off gsm48_make_ho_cmd() which doesn't send right away, so that during
inter-bsc HO we can make an RR Handover Command to send via the MSC to the remote BSS.
assignment_fsm.c:
- the Chan Mode Modify in case of re-using the same lchan is not implemented
yet, because this was also missing in the previous implementation (OS#3357).
osmo_bsc_api.c:
- simplify bsc_mr_config() and move to lchan_fsm.c, the only caller; rename to
lchan_mr_config(). (bsc_mr_config() used to copy the values to mr_bts_lv
twice, once by member assignment and then again with a memcpy.)
- During handover, we used to copy the MR config from the old lchan. Since we
may handover between FR and HR, rather set the MR Config anew every time, so
that FR rates are always available on FR lchans, and never on HR lchans.
Depends: I03ee7ce840ecfa0b6a33358e7385528aabd4873f (libosmocore),
I1f2918418c38918c5ac70acaa51a47adfca12b5e (libosmocore)
Change-Id: I82e3f918295daa83274a4cf803f046979f284366
2018-05-14 16:14:15 +00:00
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static enum gsm0808_permitted_speech audio_support_to_gsm88(const struct gsm_audio_support *audio)
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2018-07-13 07:17:07 +00:00
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{
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if (audio->hr) {
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switch (audio->ver) {
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case 1:
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return GSM0808_PERM_HR1;
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break;
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case 2:
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return GSM0808_PERM_HR2;
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break;
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case 3:
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return GSM0808_PERM_HR3;
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break;
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default:
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LOGP(DMSC, LOGL_ERROR, "Wrong speech mode: hr%d, using hr1 instead\n", audio->ver);
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return GSM0808_PERM_HR1;
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}
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} else {
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switch (audio->ver) {
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case 1:
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return GSM0808_PERM_FR1;
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break;
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case 2:
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return GSM0808_PERM_FR2;
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break;
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case 3:
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return GSM0808_PERM_FR3;
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break;
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default:
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LOGP(DMSC, LOGL_ERROR, "Wrong speech mode: fr%d, using fr1 instead\n", audio->ver);
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return GSM0808_PERM_FR1;
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}
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}
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}
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2023-01-27 09:39:18 +00:00
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/* Test if a given audio support matches one of the permitted speech settings
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* of the channel type element. The matched permitted speech value is then also
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* compared against the speech codec list. (optional, only relevant for AoIP) */
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2018-09-21 12:21:50 +00:00
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static bool test_codec_pref(const struct gsm0808_speech_codec **sc_match,
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const struct gsm0808_speech_codec_list *scl,
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const struct gsm0808_channel_type *ct,
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uint8_t perm_spch)
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2018-07-13 07:17:07 +00:00
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{
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unsigned int i;
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bool match = false;
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struct gsm0808_speech_codec sc;
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int rc;
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2018-09-21 12:21:50 +00:00
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*sc_match = NULL;
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2018-07-13 07:17:07 +00:00
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/* Try to find the given permitted speech value in the
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* codec list of the channel type element */
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for (i = 0; i < ct->perm_spch_len; i++) {
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if (ct->perm_spch[i] == perm_spch) {
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match = true;
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break;
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}
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}
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/* If we do not have a speech codec list to test against,
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* we just exit early (will be always the case in non-AoIP networks) */
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large refactoring: use FSMs for lchans; add inter-BSC HO
Add FSMs:
- timeslot_fsm: handle dynamic timeslots and OML+RSL availability.
- lchan_fsm: handle an individual lchan activation, RTP stream and release,
signal the appropriate calling FSMs on success, failure, release.
- mgw_endpoint_fsm: handle one entire endpoint with several CI.
- assignment_fsm: BSSMAP Assignment Request.
- handover_fsm: all of intra, inter-MO and inter-MT handover.
Above FSMs absorb large parts of the gscon FSM. The gscon FSM was surpassing
the maximum amount events (32), and it is more logical to treat assignment,
handover and MGW procedures in separate FSMs.
- Add logging macros for each FSM type:
- LOG_TS()
- LOG_LCHAN()
- LOG_MGWEP(), LOG_CI()
- LOG_ASSIGNMENT()
- LOG_HO()
These log with the osmo_fsm_inst where present.
New style decision: logging without a final newline char is awkward,
especially for gsmtap logging and when other logs interleave LOGPC() calls;
we have various cases where the final \n goes missing, and also this invokes
the log category checking N times instead of once.
So I decided to make these macros *always* append a newline, but only if
there is no final newline yet. I hope that the compiler optimizes the
strlen() of the constant format strings away. Thus I can log with or without
typing "\n" and always get an \n termination anyway.
General:
- replace osmo_timers, state enums and program-wide osmo_signal_dispatch()
with dedicated FSM timeouts, states and events.
- introduce a common way to handle Tnnn timers: gsm_timers.h/.c: struct T_def.
These can be used (with some macro magic) to define a state's timeout once,
and not make mistakes for each osmo_fsm_inst_state_chg().
Details:
bsc_subscr_conn_fsm.c:
- move most states of this FSM to lchan_fsm, assignment_fsm, handover_fsm and
mgw_endpoint_fsm.
- There is exactly one state for an ongoing Assignment, with all details
handled in conn->assignment.fi. The state relies on the assignment_fsm's
timeout.
- There is one state for an ongoing Handover; except for an incoming Handover
from a remote BSS, the gscon remains in ST_INIT until the new lchan and conn
are both established.
- move bssmap_add_lcls_status() to osmo_bsc_lcls.c
abis_rsl.c:
- move all dynamic timeslot logic away into timeslot_fsm. Only keep plain send/receive functions in
abis_rsl.c
- reduce some rsl functions to merely send a message, rename to "_tx_".
- rsl_ipacc_mdcx(): add '_tx_' in the name; move parts that change the lchan state out into the
lchan_fsm, the lchan->abis_ip.* are now set there prior to invoking this function.
- move all timers and error/release handling away into various FSMs.
- tweak ipa_smod_s_for_lchan() and ipa_rtp_pt_for_lchan() to not require an
lchan passed, but just mode,type that they require. Rename to
ipacc_speech_mode*() and ipacc_payload_type().
- add rsl_forward_layer3_info, used for inter-BSC HO MO, to just send the RR
message received during BSSMAP Handover Command.
- move various logging to LOG_LCHAN() in order to log with the lchan FSM instance.
One drawback is that the lchan FSM is limited to one logging category, i.e. this moves some logging
from DRR to DRSL. It might actually make sense to combine those categories.
- lose LOGP...LOGPC logging cascades: they are bad for gsmtap logging and for performance.
- handle_classmark_chg(): change logging, move cm2 len check out of the cm3 condition (I hope that's
correct).
- gsm48_send_ho_cmd(): split off gsm48_make_ho_cmd() which doesn't send right away, so that during
inter-bsc HO we can make an RR Handover Command to send via the MSC to the remote BSS.
assignment_fsm.c:
- the Chan Mode Modify in case of re-using the same lchan is not implemented
yet, because this was also missing in the previous implementation (OS#3357).
osmo_bsc_api.c:
- simplify bsc_mr_config() and move to lchan_fsm.c, the only caller; rename to
lchan_mr_config(). (bsc_mr_config() used to copy the values to mr_bts_lv
twice, once by member assignment and then again with a memcpy.)
- During handover, we used to copy the MR config from the old lchan. Since we
may handover between FR and HR, rather set the MR Config anew every time, so
that FR rates are always available on FR lchans, and never on HR lchans.
Depends: I03ee7ce840ecfa0b6a33358e7385528aabd4873f (libosmocore),
I1f2918418c38918c5ac70acaa51a47adfca12b5e (libosmocore)
Change-Id: I82e3f918295daa83274a4cf803f046979f284366
2018-05-14 16:14:15 +00:00
|
|
|
if (!scl || !scl->len)
|
2018-07-13 07:17:07 +00:00
|
|
|
return match;
|
|
|
|
|
|
|
|
|
|
/* If we failed to match until here, there is no
|
|
|
|
|
* point in testing further */
|
|
|
|
|
if (match == false)
|
|
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
/* Extrapolate speech codec data */
|
|
|
|
|
rc = gsm0808_speech_codec_from_chan_type(&sc, perm_spch);
|
|
|
|
|
if (rc < 0)
|
|
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
/* Try to find extrapolated speech codec data in
|
|
|
|
|
* the speech codec list */
|
|
|
|
|
for (i = 0; i < scl->len; i++) {
|
2018-09-21 12:21:50 +00:00
|
|
|
if (sc.type == scl->codec[i].type) {
|
|
|
|
|
*sc_match = &scl->codec[i];
|
2018-07-13 07:17:07 +00:00
|
|
|
return true;
|
2018-09-21 12:21:50 +00:00
|
|
|
}
|
2018-07-13 07:17:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
2023-02-09 14:09:55 +00:00
|
|
|
static bool test_codec_support_bts_rate(const struct gsm_bts *bts, const bool full_rate)
|
2018-07-13 14:14:18 +00:00
|
|
|
{
|
2018-10-10 09:58:02 +00:00
|
|
|
unsigned int i;
|
2023-02-09 14:09:55 +00:00
|
|
|
struct gsm_bts_trx *trx;
|
2018-10-10 09:58:02 +00:00
|
|
|
|
|
|
|
|
llist_for_each_entry(trx, &bts->trx_list, list) {
|
|
|
|
|
for (i = 0; i < TRX_NR_TS; i++) {
|
2022-09-06 22:09:36 +00:00
|
|
|
switch (trx->ts[i].pchan_from_config) {
|
|
|
|
|
case GSM_PCHAN_OSMO_DYN:
|
2023-02-09 14:09:55 +00:00
|
|
|
return true;
|
2022-09-06 22:09:36 +00:00
|
|
|
case GSM_PCHAN_TCH_F:
|
|
|
|
|
case GSM_PCHAN_TCH_F_PDCH:
|
|
|
|
|
if (full_rate)
|
|
|
|
|
return true;
|
2023-03-03 08:02:57 +00:00
|
|
|
break;
|
2022-09-06 22:09:36 +00:00
|
|
|
case GSM_PCHAN_TCH_H:
|
|
|
|
|
if (!full_rate)
|
|
|
|
|
return true;
|
2023-03-03 08:02:57 +00:00
|
|
|
break;
|
2022-09-06 22:09:36 +00:00
|
|
|
default:
|
|
|
|
|
continue;
|
|
|
|
|
}
|
2018-10-10 09:58:02 +00:00
|
|
|
}
|
|
|
|
|
}
|
2023-02-09 14:09:55 +00:00
|
|
|
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Check if the given permitted speech value is supported by the BTS
|
|
|
|
|
* (vty option bts->codec-support). */
|
|
|
|
|
static bool test_codec_support_bts(const struct gsm_bts *bts, uint8_t perm_spch)
|
|
|
|
|
{
|
|
|
|
|
const struct bts_codec_conf *bts_codec = &bts->codec;
|
|
|
|
|
bool full_rate;
|
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
|
|
/* Check if the BTS provides a physical channel that matches the
|
|
|
|
|
* bandwidth of the desired codec. */
|
|
|
|
|
rc = full_rate_from_perm_spch(&full_rate, perm_spch);
|
|
|
|
|
if (rc < 0)
|
|
|
|
|
return false;
|
|
|
|
|
if (!test_codec_support_bts_rate(bts, full_rate))
|
2018-10-10 09:58:02 +00:00
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
/* Check codec support */
|
2018-07-13 14:14:18 +00:00
|
|
|
switch (perm_spch) {
|
|
|
|
|
case GSM0808_PERM_FR1:
|
|
|
|
|
/* GSM-FR is always supported by all BTSs. There is also no way to
|
|
|
|
|
* selectively disable GSM-RF per BTS via VTY. */
|
|
|
|
|
return true;
|
|
|
|
|
case GSM0808_PERM_FR2:
|
2022-09-06 22:09:36 +00:00
|
|
|
return (bool)bts_codec->efr;
|
2018-07-13 14:14:18 +00:00
|
|
|
case GSM0808_PERM_FR3:
|
|
|
|
|
case GSM0808_PERM_HR3:
|
2022-09-06 22:09:36 +00:00
|
|
|
return (bool)bts_codec->amr;
|
|
|
|
|
case GSM0808_PERM_HR1:
|
|
|
|
|
return (bool)bts_codec->hr;
|
2018-07-13 14:14:18 +00:00
|
|
|
default:
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
2018-09-21 12:21:50 +00:00
|
|
|
/* Generate the bss supported amr configuration bits (S0-S15) */
|
|
|
|
|
static uint16_t gen_bss_supported_amr_s15_s0(const struct bsc_msc_data *msc, const struct gsm_bts *bts, bool hr)
|
|
|
|
|
{
|
|
|
|
|
const struct gsm48_multi_rate_conf *amr_cfg_bts;
|
|
|
|
|
const struct gsm48_multi_rate_conf *amr_cfg_msc;
|
|
|
|
|
uint16_t amr_s15_s0_bts;
|
|
|
|
|
uint16_t amr_s15_s0_msc;
|
|
|
|
|
|
|
|
|
|
/* Lookup the BTS specific AMR rate configuration. This config is set
|
|
|
|
|
* via the VTY for each BTS individually. In cases where no configuration
|
|
|
|
|
* is set we will assume a safe default */
|
|
|
|
|
if (hr) {
|
|
|
|
|
amr_cfg_bts = (struct gsm48_multi_rate_conf *)&bts->mr_half.gsm48_ie;
|
|
|
|
|
amr_s15_s0_bts = gsm0808_sc_cfg_from_gsm48_mr_cfg(amr_cfg_bts, false);
|
|
|
|
|
} else {
|
|
|
|
|
amr_cfg_bts = (struct gsm48_multi_rate_conf *)&bts->mr_full.gsm48_ie;
|
|
|
|
|
amr_s15_s0_bts = gsm0808_sc_cfg_from_gsm48_mr_cfg(amr_cfg_bts, true);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Lookup the AMR rate configuration that is set for the MSC */
|
|
|
|
|
amr_cfg_msc = &msc->amr_conf;
|
|
|
|
|
amr_s15_s0_msc = gsm0808_sc_cfg_from_gsm48_mr_cfg(amr_cfg_msc, true);
|
|
|
|
|
|
|
|
|
|
/* Calculate the intersection of the two configurations and update S0-S15
|
|
|
|
|
* in the codec list. */
|
|
|
|
|
return amr_s15_s0_bts & amr_s15_s0_msc;
|
|
|
|
|
}
|
|
|
|
|
|
2019-03-01 16:14:22 +00:00
|
|
|
/* Special handling for AMR rate configuration bits (S15-S0) */
|
|
|
|
|
static int match_amr_s15_s0(struct channel_mode_and_rate *ch_mode_rate, const struct bsc_msc_data *msc, const struct gsm_bts *bts, const struct gsm0808_speech_codec *sc_match, uint8_t perm_spch)
|
|
|
|
|
{
|
|
|
|
|
uint16_t amr_s15_s0_supported;
|
2020-07-15 18:53:52 +00:00
|
|
|
|
2019-03-01 16:14:22 +00:00
|
|
|
/* Normally the MSC should never try to advertise an AMR codec
|
|
|
|
|
* configuration that we did not previously advertised as supported.
|
|
|
|
|
* However, to ensure that no unsupported AMR codec configuration
|
|
|
|
|
* enters the further processing steps we again lookup what we support
|
|
|
|
|
* and generate an intersection. All further processing is then done
|
|
|
|
|
* with this intersection result. At the same time we will make sure
|
|
|
|
|
* that the intersection contains at least one rate setting. */
|
2020-07-15 18:53:52 +00:00
|
|
|
|
2019-03-01 16:14:22 +00:00
|
|
|
amr_s15_s0_supported = gen_bss_supported_amr_s15_s0(msc, bts, (perm_spch == GSM0808_PERM_HR3));
|
|
|
|
|
|
|
|
|
|
/* NOTE: The sc_match pointer points to a speech codec from the speech
|
|
|
|
|
* codec list that has been communicated with the ASSIGNMENT COMMAND.
|
|
|
|
|
* However, only AoIP based networks will include a speech codec list
|
|
|
|
|
* into the ASSIGNMENT COMMAND. For non AoIP based networks, no speech
|
|
|
|
|
* codec (sc_match) will be available, so we will fully rely on the
|
2019-11-13 21:10:41 +00:00
|
|
|
* local configuration for those cases. */
|
2019-03-01 16:14:22 +00:00
|
|
|
if (sc_match)
|
|
|
|
|
ch_mode_rate->s15_s0 = sc_match->cfg & amr_s15_s0_supported;
|
|
|
|
|
else
|
|
|
|
|
ch_mode_rate->s15_s0 = amr_s15_s0_supported;
|
|
|
|
|
|
2019-11-13 21:10:41 +00:00
|
|
|
/* Prefer "Config-NB-Code = 1" (S1) over all other AMR rates settings.
|
2019-03-01 16:14:22 +00:00
|
|
|
* When S1 is set, the active set will automatically include 12.2k, 7.4k,
|
|
|
|
|
* 5.9k, 4.75k, in case of HR 12,2k is left out. */
|
|
|
|
|
if (ch_mode_rate->s15_s0 & GSM0808_SC_CFG_AMR_4_75_5_90_7_40_12_20) {
|
|
|
|
|
ch_mode_rate->s15_s0 &= 0xff00;
|
|
|
|
|
ch_mode_rate->s15_s0 |= GSM0808_SC_CFG_AMR_4_75_5_90_7_40_12_20;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Make sure at least one rate is set. */
|
|
|
|
|
if ((ch_mode_rate->s15_s0 & 0x00ff) == 0x0000)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2023-01-27 09:39:18 +00:00
|
|
|
/*! Match the codec preferences from local config with codec preference IEs
|
|
|
|
|
* received from the MSC and the BTS' codec configuration.
|
2019-01-22 10:29:06 +00:00
|
|
|
* \param[out] ch_mode_rate resulting codec and rate information
|
large refactoring: use FSMs for lchans; add inter-BSC HO
Add FSMs:
- timeslot_fsm: handle dynamic timeslots and OML+RSL availability.
- lchan_fsm: handle an individual lchan activation, RTP stream and release,
signal the appropriate calling FSMs on success, failure, release.
- mgw_endpoint_fsm: handle one entire endpoint with several CI.
- assignment_fsm: BSSMAP Assignment Request.
- handover_fsm: all of intra, inter-MO and inter-MT handover.
Above FSMs absorb large parts of the gscon FSM. The gscon FSM was surpassing
the maximum amount events (32), and it is more logical to treat assignment,
handover and MGW procedures in separate FSMs.
- Add logging macros for each FSM type:
- LOG_TS()
- LOG_LCHAN()
- LOG_MGWEP(), LOG_CI()
- LOG_ASSIGNMENT()
- LOG_HO()
These log with the osmo_fsm_inst where present.
New style decision: logging without a final newline char is awkward,
especially for gsmtap logging and when other logs interleave LOGPC() calls;
we have various cases where the final \n goes missing, and also this invokes
the log category checking N times instead of once.
So I decided to make these macros *always* append a newline, but only if
there is no final newline yet. I hope that the compiler optimizes the
strlen() of the constant format strings away. Thus I can log with or without
typing "\n" and always get an \n termination anyway.
General:
- replace osmo_timers, state enums and program-wide osmo_signal_dispatch()
with dedicated FSM timeouts, states and events.
- introduce a common way to handle Tnnn timers: gsm_timers.h/.c: struct T_def.
These can be used (with some macro magic) to define a state's timeout once,
and not make mistakes for each osmo_fsm_inst_state_chg().
Details:
bsc_subscr_conn_fsm.c:
- move most states of this FSM to lchan_fsm, assignment_fsm, handover_fsm and
mgw_endpoint_fsm.
- There is exactly one state for an ongoing Assignment, with all details
handled in conn->assignment.fi. The state relies on the assignment_fsm's
timeout.
- There is one state for an ongoing Handover; except for an incoming Handover
from a remote BSS, the gscon remains in ST_INIT until the new lchan and conn
are both established.
- move bssmap_add_lcls_status() to osmo_bsc_lcls.c
abis_rsl.c:
- move all dynamic timeslot logic away into timeslot_fsm. Only keep plain send/receive functions in
abis_rsl.c
- reduce some rsl functions to merely send a message, rename to "_tx_".
- rsl_ipacc_mdcx(): add '_tx_' in the name; move parts that change the lchan state out into the
lchan_fsm, the lchan->abis_ip.* are now set there prior to invoking this function.
- move all timers and error/release handling away into various FSMs.
- tweak ipa_smod_s_for_lchan() and ipa_rtp_pt_for_lchan() to not require an
lchan passed, but just mode,type that they require. Rename to
ipacc_speech_mode*() and ipacc_payload_type().
- add rsl_forward_layer3_info, used for inter-BSC HO MO, to just send the RR
message received during BSSMAP Handover Command.
- move various logging to LOG_LCHAN() in order to log with the lchan FSM instance.
One drawback is that the lchan FSM is limited to one logging category, i.e. this moves some logging
from DRR to DRSL. It might actually make sense to combine those categories.
- lose LOGP...LOGPC logging cascades: they are bad for gsmtap logging and for performance.
- handle_classmark_chg(): change logging, move cm2 len check out of the cm3 condition (I hope that's
correct).
- gsm48_send_ho_cmd(): split off gsm48_make_ho_cmd() which doesn't send right away, so that during
inter-bsc HO we can make an RR Handover Command to send via the MSC to the remote BSS.
assignment_fsm.c:
- the Chan Mode Modify in case of re-using the same lchan is not implemented
yet, because this was also missing in the previous implementation (OS#3357).
osmo_bsc_api.c:
- simplify bsc_mr_config() and move to lchan_fsm.c, the only caller; rename to
lchan_mr_config(). (bsc_mr_config() used to copy the values to mr_bts_lv
twice, once by member assignment and then again with a memcpy.)
- During handover, we used to copy the MR config from the old lchan. Since we
may handover between FR and HR, rather set the MR Config anew every time, so
that FR rates are always available on FR lchans, and never on HR lchans.
Depends: I03ee7ce840ecfa0b6a33358e7385528aabd4873f (libosmocore),
I1f2918418c38918c5ac70acaa51a47adfca12b5e (libosmocore)
Change-Id: I82e3f918295daa83274a4cf803f046979f284366
2018-05-14 16:14:15 +00:00
|
|
|
* \param[in] ct GSM 08.08 channel type received from MSC.
|
|
|
|
|
* \param[in] scl GSM 08.08 speech codec list received from MSC (optional).
|
2018-09-21 12:21:50 +00:00
|
|
|
* \param[in] msc associated msc (current codec settings).
|
|
|
|
|
* \param[in] bts associated bts (current codec settings).
|
2019-01-22 10:29:06 +00:00
|
|
|
* \param[in] pref selected rate preference (full, half or none).
|
2018-07-13 07:17:07 +00:00
|
|
|
* \returns 0 on success, -1 in case no match was found */
|
2019-01-22 10:29:06 +00:00
|
|
|
int match_codec_pref(struct channel_mode_and_rate *ch_mode_rate,
|
large refactoring: use FSMs for lchans; add inter-BSC HO
Add FSMs:
- timeslot_fsm: handle dynamic timeslots and OML+RSL availability.
- lchan_fsm: handle an individual lchan activation, RTP stream and release,
signal the appropriate calling FSMs on success, failure, release.
- mgw_endpoint_fsm: handle one entire endpoint with several CI.
- assignment_fsm: BSSMAP Assignment Request.
- handover_fsm: all of intra, inter-MO and inter-MT handover.
Above FSMs absorb large parts of the gscon FSM. The gscon FSM was surpassing
the maximum amount events (32), and it is more logical to treat assignment,
handover and MGW procedures in separate FSMs.
- Add logging macros for each FSM type:
- LOG_TS()
- LOG_LCHAN()
- LOG_MGWEP(), LOG_CI()
- LOG_ASSIGNMENT()
- LOG_HO()
These log with the osmo_fsm_inst where present.
New style decision: logging without a final newline char is awkward,
especially for gsmtap logging and when other logs interleave LOGPC() calls;
we have various cases where the final \n goes missing, and also this invokes
the log category checking N times instead of once.
So I decided to make these macros *always* append a newline, but only if
there is no final newline yet. I hope that the compiler optimizes the
strlen() of the constant format strings away. Thus I can log with or without
typing "\n" and always get an \n termination anyway.
General:
- replace osmo_timers, state enums and program-wide osmo_signal_dispatch()
with dedicated FSM timeouts, states and events.
- introduce a common way to handle Tnnn timers: gsm_timers.h/.c: struct T_def.
These can be used (with some macro magic) to define a state's timeout once,
and not make mistakes for each osmo_fsm_inst_state_chg().
Details:
bsc_subscr_conn_fsm.c:
- move most states of this FSM to lchan_fsm, assignment_fsm, handover_fsm and
mgw_endpoint_fsm.
- There is exactly one state for an ongoing Assignment, with all details
handled in conn->assignment.fi. The state relies on the assignment_fsm's
timeout.
- There is one state for an ongoing Handover; except for an incoming Handover
from a remote BSS, the gscon remains in ST_INIT until the new lchan and conn
are both established.
- move bssmap_add_lcls_status() to osmo_bsc_lcls.c
abis_rsl.c:
- move all dynamic timeslot logic away into timeslot_fsm. Only keep plain send/receive functions in
abis_rsl.c
- reduce some rsl functions to merely send a message, rename to "_tx_".
- rsl_ipacc_mdcx(): add '_tx_' in the name; move parts that change the lchan state out into the
lchan_fsm, the lchan->abis_ip.* are now set there prior to invoking this function.
- move all timers and error/release handling away into various FSMs.
- tweak ipa_smod_s_for_lchan() and ipa_rtp_pt_for_lchan() to not require an
lchan passed, but just mode,type that they require. Rename to
ipacc_speech_mode*() and ipacc_payload_type().
- add rsl_forward_layer3_info, used for inter-BSC HO MO, to just send the RR
message received during BSSMAP Handover Command.
- move various logging to LOG_LCHAN() in order to log with the lchan FSM instance.
One drawback is that the lchan FSM is limited to one logging category, i.e. this moves some logging
from DRR to DRSL. It might actually make sense to combine those categories.
- lose LOGP...LOGPC logging cascades: they are bad for gsmtap logging and for performance.
- handle_classmark_chg(): change logging, move cm2 len check out of the cm3 condition (I hope that's
correct).
- gsm48_send_ho_cmd(): split off gsm48_make_ho_cmd() which doesn't send right away, so that during
inter-bsc HO we can make an RR Handover Command to send via the MSC to the remote BSS.
assignment_fsm.c:
- the Chan Mode Modify in case of re-using the same lchan is not implemented
yet, because this was also missing in the previous implementation (OS#3357).
osmo_bsc_api.c:
- simplify bsc_mr_config() and move to lchan_fsm.c, the only caller; rename to
lchan_mr_config(). (bsc_mr_config() used to copy the values to mr_bts_lv
twice, once by member assignment and then again with a memcpy.)
- During handover, we used to copy the MR config from the old lchan. Since we
may handover between FR and HR, rather set the MR Config anew every time, so
that FR rates are always available on FR lchans, and never on HR lchans.
Depends: I03ee7ce840ecfa0b6a33358e7385528aabd4873f (libosmocore),
I1f2918418c38918c5ac70acaa51a47adfca12b5e (libosmocore)
Change-Id: I82e3f918295daa83274a4cf803f046979f284366
2018-05-14 16:14:15 +00:00
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const struct gsm0808_channel_type *ct,
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const struct gsm0808_speech_codec_list *scl,
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2018-09-21 12:21:50 +00:00
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const struct bsc_msc_data *msc,
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2019-01-22 10:29:06 +00:00
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const struct gsm_bts *bts, enum rate_pref rate_pref)
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2018-07-13 07:17:07 +00:00
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{
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unsigned int i;
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uint8_t perm_spch;
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2019-03-07 15:32:02 +00:00
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bool full_rate;
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2018-07-13 07:17:07 +00:00
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bool match = false;
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2018-09-21 12:21:50 +00:00
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const struct gsm0808_speech_codec *sc_match = NULL;
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2018-10-10 08:42:43 +00:00
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int rc;
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2018-07-13 07:17:07 +00:00
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2018-09-21 12:21:50 +00:00
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/* Note: Normally the MSC should never try to advertise a codec that
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* we did not advertise as supported before. In order to ensure that
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* no unsupported codec is accepted, we make sure that the codec is
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* indeed available with the current BTS and MSC configuration */
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for (i = 0; i < msc->audio_length; i++) {
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2018-07-13 14:14:18 +00:00
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/* Pick a permitted speech value from the global codec configuration list */
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2023-02-28 23:43:06 +00:00
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perm_spch = audio_support_to_gsm88(&msc->audio_support[i]);
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2018-07-13 14:14:18 +00:00
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2019-01-22 10:29:06 +00:00
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/* Determine if the result is a half or full rate codec */
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2019-03-07 15:32:02 +00:00
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rc = full_rate_from_perm_spch(&full_rate, perm_spch);
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2019-01-22 10:29:06 +00:00
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if (rc < 0)
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return -EINVAL;
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2019-03-07 15:32:02 +00:00
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ch_mode_rate->chan_rate = full_rate ? CH_RATE_FULL : CH_RATE_HALF;
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2019-01-22 10:29:06 +00:00
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/* If we have a preference for FR or HR in our request, we
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* discard the potential match */
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2019-03-07 15:32:02 +00:00
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if (rate_pref == RATE_PREF_HR && ch_mode_rate->chan_rate == CH_RATE_FULL)
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2019-01-22 10:29:06 +00:00
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continue;
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2019-03-07 15:32:02 +00:00
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if (rate_pref == RATE_PREF_FR && ch_mode_rate->chan_rate == CH_RATE_HALF)
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2019-01-22 10:29:06 +00:00
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continue;
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2018-07-13 14:14:18 +00:00
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/* Check this permitted speech value against the BTS specific parameters.
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* if the BTS does not support the codec, try the next one */
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2018-10-10 09:58:02 +00:00
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if (!test_codec_support_bts(bts, perm_spch))
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2018-07-13 14:14:18 +00:00
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continue;
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/* Match the permitted speech value against the codec lists that were
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* advertised by the MS and the MSC */
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2019-03-01 16:14:22 +00:00
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if (!test_codec_pref(&sc_match, scl, ct, perm_spch)) {
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continue;
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2018-07-13 07:17:07 +00:00
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}
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2019-03-01 16:14:22 +00:00
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/* Special handling for AMR */
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if (perm_spch == GSM0808_PERM_HR3 || perm_spch == GSM0808_PERM_FR3) {
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rc = match_amr_s15_s0(ch_mode_rate, msc, bts, sc_match, perm_spch);
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if (rc < 0) {
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ch_mode_rate->s15_s0 = 0;
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continue;
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}
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} else
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ch_mode_rate->s15_s0 = 0;
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match = true;
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break;
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2018-07-13 07:17:07 +00:00
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}
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2023-02-09 14:32:38 +00:00
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/* Exit without result, in case no match can be detected */
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2018-07-13 07:17:07 +00:00
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if (!match) {
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2019-01-22 10:29:06 +00:00
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ch_mode_rate->chan_mode = GSM48_CMODE_SIGN;
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2019-03-07 15:32:02 +00:00
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ch_mode_rate->chan_rate = CH_RATE_SDCCH;
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2019-01-22 10:29:06 +00:00
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ch_mode_rate->s15_s0 = 0;
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2018-07-13 07:17:07 +00:00
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return -1;
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}
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/* Lookup a channel mode for the selected codec */
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2019-01-22 10:29:06 +00:00
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ch_mode_rate->chan_mode = gsm88_to_chan_mode(perm_spch);
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2018-07-13 07:17:07 +00:00
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return 0;
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}
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2018-09-13 10:05:51 +00:00
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/*! Determine the BSS supported speech codec list that is sent to the MSC with
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* the COMPLETE LAYER 3 INFORMATION message.
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* \param[out] scl GSM 08.08 speech codec list with BSS supported codecs.
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* \param[in] msc associated msc (current codec settings).
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* \param[in] bts associated bts (current codec settings). */
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void gen_bss_supported_codec_list(struct gsm0808_speech_codec_list *scl,
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const struct bsc_msc_data *msc, const struct gsm_bts *bts)
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{
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uint8_t perm_spch;
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unsigned int i;
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int rc;
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memset(scl, 0, sizeof(*scl));
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for (i = 0; i < msc->audio_length; i++) {
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/* Pick a permitted speech value from the global codec configuration list */
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2023-02-28 23:43:06 +00:00
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perm_spch = audio_support_to_gsm88(&msc->audio_support[i]);
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2018-09-13 10:05:51 +00:00
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/* Check this permitted speech value against the BTS specific parameters.
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* if the BTS does not support the codec, try the next one */
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2018-10-10 09:58:02 +00:00
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if (!test_codec_support_bts(bts, perm_spch))
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2018-09-13 10:05:51 +00:00
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continue;
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/* Write item into codec list */
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rc = gsm0808_speech_codec_from_chan_type(&scl->codec[scl->len], perm_spch);
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if (rc != 0)
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continue;
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/* AMR (HR/FR version 3) is the only codec that requires a codec
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* configuration (S0-S15). Determine the current configuration and update
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* the cfg flag. */
|
2023-02-28 23:43:06 +00:00
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if (msc->audio_support[i].ver == 3)
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scl->codec[scl->len].cfg = gen_bss_supported_amr_s15_s0(msc, bts, msc->audio_support[i].hr);
|
2018-09-13 10:05:51 +00:00
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scl->len++;
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}
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}
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|
2018-10-23 14:05:13 +00:00
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/*! Calculate the intersection of the rate configuration of two multirate configuration
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* IE structures. The result c will be a copy of a, but the rate configuration bits
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* will be the intersection of the rate configuration bits in a and b.
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* \param[out] c user provided memory to store the result.
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* \param[in] a multi rate configuration a.
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* \param[in] b multi rate configuration b.
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* \returns 0 on success, -1 when the result contains an empty set of modes. */
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int calc_amr_rate_intersection(struct gsm48_multi_rate_conf *c,
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const struct gsm48_multi_rate_conf *b,
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const struct gsm48_multi_rate_conf *a)
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{
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struct gsm48_multi_rate_conf res;
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uint8_t *_a = (uint8_t *) a;
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uint8_t *_b = (uint8_t *) b;
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uint8_t *_res = (uint8_t *) & res;
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memcpy(&res, a, sizeof(res));
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_res[1] = _a[1] & _b[1];
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if (_res[1] == 0x00)
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return -1;
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if (c)
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memcpy(c, &res, sizeof(*c));
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return 0;
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}
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|
2018-10-05 12:59:37 +00:00
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/*! Visit the codec settings for the MSC and for each BTS in order to make sure
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* that the configuration does not contain any combinations that lead into a
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* mutually exclusive codec configuration (empty intersection).
|
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* \param[in] mscs list head of the msc list.
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* \returns 0 on success, -1 in case an invalid setting is found. */
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int check_codec_pref(struct llist_head *mscs)
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{
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struct bsc_msc_data *msc;
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struct gsm_bts *bts;
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struct gsm0808_speech_codec_list scl;
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int rc = 0;
|
2018-10-23 14:05:13 +00:00
|
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|
int rc_rate;
|
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const struct gsm48_multi_rate_conf *bts_gsm48_ie;
|
2018-10-05 12:59:37 +00:00
|
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llist_for_each_entry(msc, mscs, entry) {
|
|
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|
|
llist_for_each_entry(bts, &msc->network->bts_list, list) {
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|
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|
|
gen_bss_supported_codec_list(&scl, msc, bts);
|
|
|
|
|
if (scl.len <= 0) {
|
|
|
|
|
LOGP(DMSC, LOGL_FATAL,
|
2018-10-10 09:58:02 +00:00
|
|
|
"codec-support/trx config of BTS %u does not intersect with codec-list of MSC %u\n",
|
2018-10-05 12:59:37 +00:00
|
|
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bts->nr, msc->nr);
|
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|
rc = -1;
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|
}
|
2018-10-23 14:05:13 +00:00
|
|
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|
2023-11-27 14:28:48 +00:00
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|
|
/* Full rate codec check, only if any full rate TS is configured. */
|
|
|
|
|
if (test_codec_support_bts_rate(bts, true)) {
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bts_gsm48_ie = (struct gsm48_multi_rate_conf *)&bts->mr_full.gsm48_ie;
|
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|
rc_rate = calc_amr_rate_intersection(NULL, &msc->amr_conf, bts_gsm48_ie);
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|
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if (rc_rate < 0) {
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LOGP(DMSC, LOGL_FATAL,
|
|
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"network amr tch-f mode config of BTS %u does not intersect with amr-config of MSC %u\n",
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bts->nr, msc->nr);
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rc = -1;
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}
|
2018-10-23 14:05:13 +00:00
|
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}
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|
2023-11-27 14:28:48 +00:00
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/* Half rate codec check, only if any half rate TS is configured. */
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|
if (test_codec_support_bts_rate(bts, false)) {
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bts_gsm48_ie = (struct gsm48_multi_rate_conf *)&bts->mr_half.gsm48_ie;
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|
rc_rate = calc_amr_rate_intersection(NULL, &msc->amr_conf, bts_gsm48_ie);
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|
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|
if (rc_rate < 0) {
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LOGP(DMSC, LOGL_FATAL,
|
|
|
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"network amr tch-h mode config of BTS %u does not intersect with amr-config of MSC %u\n",
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bts->nr, msc->nr);
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rc = -1;
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|
}
|
2018-10-23 14:05:13 +00:00
|
|
|
}
|
2018-10-05 12:59:37 +00:00
|
|
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}
|
|
|
|
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}
|
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return rc;
|
|
|
|
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}
|
