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osmocom-analog/src/cnetz/cnetz.c

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/* C-Netz protocol handling
*
* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
* All Rights Reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Notes on channel state an callref:
*
* If channel state is busy, it is used as SpK, also it has callref.
*
* Each transaction has callref, but callref is only assigned to channel
* in SpK mode, so voice frames are routed there.
*
*/
/* Notes on transaction state:
*
* The state is used to define what is scheduled next, what message is awaited,
* what is done when timeout. The event (scheduler, message, timeout) is
* processed then and the state may change.
*/
/* Call control process:
*
* If an MT (mobile terminating) call is made, a transaction with callref is
* created. The transaction is linked to OgK. When the scheduler schedules
* VAK(R), the SpK is allocated and the transaction is linked to it.
*
* If no SpK is available, the call is rejected. If queue (Warteschlange) is
* enabled, WSK(R) is scheduled. After transmission, the state changes to
* TRANS_MT_QUEUE. Upon timeout (no channel becomes available), the call is
* rejected by scheduling VA(R). Upon available channel the call proceeds with
* VAK(R) as described above.
*
* If an MO (mobile originating) call is made (received VWG(K)), a transaction
* with callref is created. The transaction is linked to OgK. When the
* scheduler schedules WAF(M), the process waits for WUE(M). If not received,
* the process is repeated. After N times WBN(R) is scheduled and transaction
* is destroyed. If WUE(M) is received, the scheduler schedules WBP(R) and
* then schedules VAG(R), the SpK is allocated and the transaction is linked to
* it.
*
* If no SpK is available, the call is rejected by scheduling WBN(R). If queue
* (Warteschlange) is enabled, WWBP(R) is scheduled. After transmission, the
* state is changed to TRANS_MO_QUEUE. Upon timeout (no channel becomes
* available), the call is rejected by scheduling VA(R). Upon available channel
* the call proceeds with VAG(R) as described above.
*
* Switching to SpK is performed two time slots after transmitting VAK(R) or
* VAG(R). The timer is started. The schedulers schedules 8 times BQ(K) and
* awaits at least one BEL(K). If BEK(K) is received, the timer is stopped. If
* BQ(K) was sent at least 8 times and if timer is stopped, the scheduler
* schedules VHQ(K). If no BEL(K) was received, AFK(K) is scheduled N_AFKT
* times, then the process on OgK (WBP+VAG or VAK) is repeated N times.
*
* Similar to BQ/BEL the DS/DSQ handing is performed. For MT calls, the BQ/BEL
* is followed by RTA/RTAQ handling. If the phone answers, the AT(K) is
* received and DS/DSQ handling is performed.
*
* After DS/DSQ handling, the SpK changes to distributed signalling mode.
* VHQ1/VHQ2(V) is transmitted and VH(V) is received. If VH(V) is not received
* F_VHQ times, the connection is terminated by sending AF(K) N_AFKT times.
* Transaction is released.
*
* If AT(K) or AT(V) is received, AF(K) or AF(V) is sent once and transaction
* is released.
*
* If call is released by upper layer, AF(K) is sent N_AFKT times or AF(V) is
* sent N_AFV times. The transaction is released.
*
* More details about the process can be read from the source code.
*
* Special timings and correct scheduling is defined in source code and can be
* read also in the C-Netz specs.
*/
/*
* Notes on switching from OgK to SpK
*
* Upon transmission of TRANS_VAG and TRANS_VAK, the SpK channel is allocated,
* set to busy, scheduled to switch to SpK mode after two frames. The trans-
* action is relinked from OgK to SpK.
*
* In case of a combined OgK+SpK, the channel stays the same, but will change.
*
* See below for detailed processing.
*/
/*
* Notes on database (subscriber)
*
* If a subscriber registers (transaction is created), an instance of the
* subscriber database is created. A timer is running for each instance, so
* the subscriber is paged to check availability of the phone. If the paging
* fails, a retry counter is decreased until the subscriber is removed from
* database.
*
* See database.c for more information.
*/
/*
* Notes on the combined channel hack:
*
* For combined SpK+OgK hack, the channel is used as SpK as last choice. This
* allows to use only one transceiver for making C-Netz to work. Also it allows
* to use all transceivers for simultanious phone calls. Some phones may not
* work with that.
*/
/*
* Notes on sync:
*
* The encoder generates a precise clocked signal using correction value given
* by command line. For multichannel, the second sound card's channel (slave) is
* synced to the first one (master), if calculation of signal phase might drift
* due to rounding errors.
*
* The decoder is synced to the phone, whenever it receives a valid frame.
*
* See dsp.c and fsk_fm_demod.c for code about syncing.
*/
#define CHAN cnetz->sender.kanal
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <math.h>
#include <inttypes.h>
#include "../libsample/sample.h"
#include "../libdebug/debug.h"
#include "../libmobile/call.h"
#include "../libmobile/cause.h"
#include "../libosmocc/message.h"
#include "cnetz.h"
#include "database.h"
#include "sysinfo.h"
#include "telegramm.h"
#include "dsp.h"
#include "stations.h"
/* uncomment this to do echo debugging (-l) on Speech Channel */
//#define DEBUG_SPK
#define CUT_OFF_EMPHASIS_CNETZ 796.0 /* 200 uS time constant */
/* OgK list of alternative channels, NOT including 131 */
cnetz_t *ogk_list[16];
int ogk_list_count = 0;
int ogk_list_index = 0;
/* Convert channel number to frequency number of base station.
Set 'unterband' to 1 to get frequency of mobile station. */
double cnetz_kanal2freq(int kanal, int unterband)
{
double freq = 465.750;
if (unterband == 2)
return -10.000 * 1e6;
if ((kanal & 1))
freq -= (double)(kanal + 1) / 2.0 * 0.010;
else
freq -= (double)kanal / 2.0 * 0.0125;
if (unterband)
freq -= 10.000;
return freq * 1e6;
}
/* check if number is a valid station ID */
const char *cnetz_number_valid(const char *number)
{
/* assume that the number has valid length(s) and digits */
if (number[0] > '7')
return "Digit 1 (mobile country code) exceeds 7.";
if (number[7]) {
if ((number[1] - '0') == 0)
return "Digit 2 and 3 (mobile network code) of 8-digit number must be at least 10.";
if ((number[1] - '0') * 10 + (number[2] - '0') > 31)
return "Digit 2 and 3 (mobile network code) of 8-digit number exceed 31.";
if (atoi(number + 3) > 65535)
return "Digit 4 to 8 (mobile subscriber suffix) of 8-digit number exceed 65535.";
} else {
if (atoi(number + 2) > 65535)
return "Digit 3 to 7 (mobile subscriber suffix) of 7-digit number exceed 65535.";
}
return NULL;
}
/* convert power level to P-bits by selecting next higher level */
static uint8_t cnetz_power2bits(int power)
{
switch (power) {
case 1:
return 3;
case 2:
case 3:
return 2;
case 4:
case 5:
return 1;
case 6:
case 7:
case 8:
default:
return 0;
}
}
const char *cnetz_state_name(enum cnetz_state state)
{
static char invalid[16];
switch (state) {
case CNETZ_NULL:
return "(NULL)";
case CNETZ_IDLE:
return "IDLE";
case CNETZ_BUSY:
return "BUSY";
}
sprintf(invalid, "invalid(%d)", state);
return invalid;
}
void cnetz_display_status(void)
{
sender_t *sender;
cnetz_t *cnetz;
transaction_t *trans;
display_status_start();
for (sender = sender_head; sender; sender = sender->next) {
cnetz = (cnetz_t *) sender;
display_status_channel(cnetz->sender.kanal, chan_type_short_name(cnetz->chan_type), cnetz_state_name(cnetz->state));
for (trans = cnetz->trans_list; trans; trans = trans->next)
display_status_subscriber(transaction2rufnummer(trans), trans_short_state_name(trans->state));
}
display_status_end();
}
static void cnetz_new_state(cnetz_t *cnetz, enum cnetz_state new_state)
{
if (cnetz->state == new_state)
return;
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "State change: %s -> %s\n", cnetz_state_name(cnetz->state), cnetz_state_name(new_state));
cnetz->state = new_state;
cnetz_display_status();
}
/* Convert ISDN cause to 'Ausloesegrund' of C-Netz mobile station */
uint8_t cnetz_cause_isdn2cnetz(int cause)
{
switch (cause) {
case CAUSE_NORMAL:
case CAUSE_BUSY:
case CAUSE_NOANSWER:
return CNETZ_CAUSE_TEILNEHMERBESETZT;
case CAUSE_OUTOFORDER:
case CAUSE_INVALNUMBER:
case CAUSE_NOCHANNEL:
case CAUSE_TEMPFAIL:
default:
return CNETZ_CAUSE_GASSENBESETZT;
}
}
/* global init */
int cnetz_init(void)
{
return 0;
}
/* Create transceiver instance and link to a list. */
int cnetz_create(const char *kanal_name, enum cnetz_chan_type chan_type, const char *device, int use_sdr, enum demod_type demod, int samplerate, double rx_gain, double tx_gain, int challenge_valid, uint64_t challenge, int response_valid, uint64_t response, int warteschlange, int metering, double speech_deviation, int ms_power, int measure_speed, double clock_speed[2], int polarity, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback)
{
sender_t *sender;
cnetz_t *cnetz;
int kanal;
int rc;
kanal = atoi(kanal_name);
if ((kanal & 1) && (kanal < 3 || kanal > 1147)) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Channel ('Kanal') number %d invalid. For odd channel numbers, use channel 3 ... 1147.\n", kanal);
return -EINVAL;
}
if ((kanal & 1) && kanal > 947) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "You defined an extended frequency channel %d, only newer phones support this!\n", kanal);
}
if (!(kanal & 1) && (kanal < 4 || kanal > 918)) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Channel ('Kanal') number %d invalid. For even channel numbers, use channel 4 ... 918.\n", kanal);
return -EINVAL;
}
if (!(kanal & 1) && kanal > 758) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "You defined an extended frequency channel %d, only newer phones support this!\n", kanal);
}
/* SpK must be on channel other than 131 */
if (chan_type == CHAN_TYPE_SPK && kanal == CNETZ_STD_OGK_KANAL) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "You must not use channel %d for traffic channel!\n", CNETZ_STD_OGK_KANAL);
return -EINVAL;
}
/* warn if we combine SpK and OgK, this is not supported by standard */
if (chan_type == CHAN_TYPE_OGK_SPK) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "You selected channel %d ('Orga-Kanal') for combined control + traffic channel. Some phones will reject this.\n", kanal);
}
for (sender = sender_head; sender; sender = sender->next) {
cnetz = (cnetz_t *)sender;
if (!!strcmp(sender->device, device)) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "To be able to sync multiple channels, all channels must be on the same sound device!\n");
return -EINVAL;
}
}
cnetz = calloc(1, sizeof(cnetz_t));
if (!cnetz) {
PDEBUG(DCNETZ, DEBUG_ERROR, "No memory!\n");
return -ENOMEM;
}
PDEBUG(DCNETZ, DEBUG_DEBUG, "Creating 'C-Netz' instance for 'Kanal' = %d (sample rate %d).\n", kanal, samplerate);
cnetz->kanal = kanal;
if ((chan_type == CHAN_TYPE_OGK || chan_type == CHAN_TYPE_OGK_SPK) && kanal != CNETZ_STD_OGK_KANAL) {
if (ogk_list_count == 16) {
PDEBUG(DCNETZ, DEBUG_ERROR, "No more than 16 non-standard OGK are allowed!\n");
rc = -EINVAL;
goto error;
}
ogk_list[ogk_list_count++] = cnetz;
}
/* init general part of transceiver */
/* do not enable emphasis, since it is done by cnetz code, not by common sender code */
rc = sender_create(&cnetz->sender, kanal_name, cnetz_kanal2freq(kanal, 0), cnetz_kanal2freq(kanal, 1), device, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
if (rc < 0) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Failed to init transceiver process!\n");
goto error;
}
#if 0
#warning hacking: applying different clock to slave
if (&cnetz->sender != sender_head) {
clock_speed[0] = -3;
clock_speed[1] = -3;
}
#endif
/* init audio processing */
rc = dsp_init_sender(cnetz, measure_speed, clock_speed, demod, speech_deviation);
if (rc < 0) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Failed to init signal processing!\n");
goto error;
}
cnetz->chan_type = chan_type;
cnetz->challenge_valid = challenge_valid;
cnetz->challenge = challenge;
cnetz->response_valid = response_valid;
cnetz->response = response;
cnetz->warteschlange = warteschlange;
cnetz->metering = metering;
cnetz->ms_power = ms_power;
switch (polarity) {
case 1:
/* select cell 0 for positive polarity */
cnetz->negative_polarity = 0;
cnetz->auto_polarity = 0;
break;
case -1:
/* select cell 1 for negative polarity */
cnetz->negative_polarity = 1;
cnetz->auto_polarity = 0;
break;
default:
/* send two cells and select by the first message from mobile */
cnetz->negative_polarity = 0;
cnetz->auto_polarity = 1;
}
cnetz->pre_emphasis = pre_emphasis;
cnetz->de_emphasis = de_emphasis;
rc = init_emphasis(&cnetz->estate, samplerate, CUT_OFF_EMPHASIS_CNETZ, CUT_OFF_HIGHPASS_DEFAULT, CUT_OFF_LOWPASS_DEFAULT);
if (rc < 0)
goto error;
/* go into idle state */
if (chan_type == CHAN_TYPE_OGK || chan_type == CHAN_TYPE_OGK_SPK)
cnetz_set_dsp_mode(cnetz, DSP_MODE_OGK);
else
cnetz_set_dsp_mode(cnetz, DSP_MODE_OFF);
cnetz_go_idle(cnetz);
#ifdef DEBUG_SPK
transaction_t *trans = create_transaction(cnetz, TRANS_DS, 2, 2, 22002, -1, -1, NAN);
trans->mo_call = 1;
cnetz_set_sched_dsp_mode(cnetz, DSP_MODE_SPK_K, (cnetz->sched_ts + 2) & 31);
#else
/* create transaction for speech channel loopback */
if (loopback && chan_type == CHAN_TYPE_SPK) {
transaction_t *trans = create_transaction(cnetz, TRANS_VHQ_K, 2, 2, 22002, -1, -1, NAN);
trans->mo_call = 1;
cnetz_set_dsp_mode(cnetz, DSP_MODE_SPK_K);
cnetz_set_sched_dsp_mode(cnetz, DSP_MODE_SPK_K, (cnetz->sched_ts + 1) & 31);
}
#endif
#if 0
/* debug flushing transactions */
transaction_t *trans1, *trans2;
trans1 = create_transaction(cnetz, 99, 6, 2, 15784, -1, -1, NAN);
destroy_transaction(trans1);
trans1 = create_transaction(cnetz, 99, 6, 2, 15784, -1, -1, NAN);
destroy_transaction(trans1);
trans1 = create_transaction(cnetz, 99, 6, 2, 15784, -1, -1, NAN);
trans2 = create_transaction(cnetz, 99, 2, 2, 22002, -1, -1, NAN);
unlink_transaction(trans1);
link_transaction(trans1, cnetz);
cnetz_flush_other_transactions(cnetz, trans1);
trans2 = create_transaction(cnetz, 99, 2, 2, 22002, -1, -1, NAN);
cnetz_flush_other_transactions(cnetz, trans2);
#endif
PDEBUG(DCNETZ, DEBUG_NOTICE, "Created 'Kanal' #%d of type '%s' = %s\n", kanal, chan_type_short_name(chan_type), chan_type_long_name(chan_type));
const char *name, *station;
name = get_station_name(si.fuz_nat, si.fuz_fuvst, si.fuz_rest, &station);
PDEBUG(DNMT, DEBUG_NOTICE, " -> Using cell ID: Nat=%d FuVst=%d Rest=%d Name='%s' (%s)\n", si.fuz_nat, si.fuz_fuvst, si.fuz_rest, name, station);
return 0;
error:
cnetz_destroy(&cnetz->sender);
return rc;
}
/* Destroy transceiver instance and unlink from list. */
void cnetz_destroy(sender_t *sender)
{
cnetz_t *cnetz = (cnetz_t *) sender;
transaction_t *trans;
PDEBUG(DCNETZ, DEBUG_DEBUG, "Destroying 'C-Netz' instance for 'Kanal' = %s.\n", sender->kanal);
while ((trans = search_transaction(cnetz, ~0))) {
const char *rufnummer = transaction2rufnummer(trans);
PDEBUG(DCNETZ, DEBUG_NOTICE, "Removing pending transaction for subscriber '%s'\n", rufnummer);
destroy_transaction(trans);
}
dsp_cleanup_sender(cnetz);
sender_destroy(&cnetz->sender);
free(cnetz);
}
static cnetz_t *search_free_spk(int extended)
{
sender_t *sender;
cnetz_t *cnetz, *ogk_spk = NULL;
for (sender = sender_head; sender; sender = sender->next) {
cnetz = (cnetz_t *) sender;
/* ignore extended frequency, if not supported */
if (!extended) {
if ((cnetz->kanal & 1) && cnetz->kanal > 947)
continue;
if (!(cnetz->kanal & 1) && cnetz->kanal > 758)
continue;
}
/* ignore busy channel */
if (cnetz->state != CNETZ_IDLE)
continue;
/* return first free SpK */
if (cnetz->chan_type == CHAN_TYPE_SPK)
return cnetz;
/* remember OgK/SpK combined channel as second alternative */
if (cnetz->chan_type == CHAN_TYPE_OGK_SPK)
ogk_spk = cnetz;
}
return ogk_spk;
}
static cnetz_t *search_ogk(int kanal)
{
sender_t *sender;
cnetz_t *cnetz;
for (sender = sender_head; sender; sender = sender->next) {
cnetz = (cnetz_t *) sender;
/* ignore busy channel */
if (cnetz->state != CNETZ_IDLE)
continue;
if (cnetz->kanal != kanal)
continue;
if (cnetz->chan_type == CHAN_TYPE_OGK)
return cnetz;
if (cnetz->chan_type == CHAN_TYPE_OGK_SPK)
return cnetz;
}
return NULL;
}
/* Abort connection, if any and send idle broadcast */
void cnetz_go_idle(cnetz_t *cnetz)
{
transaction_t *trans;
if (cnetz->state == CNETZ_IDLE)
return;
if (cnetz->trans_list) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Releasing but still having transaction, please fix!\n");
if (cnetz->trans_list->callref)
call_up_release(cnetz->trans_list->callref, CAUSE_NORMAL);
destroy_transaction(cnetz->trans_list);
}
PDEBUG(DCNETZ, DEBUG_INFO, "Entering IDLE state on channel %s.\n", cnetz->sender.kanal);
cnetz_new_state(cnetz, CNETZ_IDLE);
/* set scheduler to OgK or turn off SpK */
if (cnetz->dsp_mode == DSP_MODE_SPK_K || cnetz->dsp_mode == DSP_MODE_SPK_V) {
/* switch next frame after distributed signaling boundary (multiple of 8 slots) */
cnetz_set_sched_dsp_mode(cnetz, (cnetz->chan_type == CHAN_TYPE_OGK || cnetz->chan_type == CHAN_TYPE_OGK_SPK) ? DSP_MODE_OGK : DSP_MODE_OFF, (cnetz->sched_ts + 8) & 24);
} else {
/* switch next frame */
cnetz_set_sched_dsp_mode(cnetz, (cnetz->chan_type == CHAN_TYPE_OGK || cnetz->chan_type == CHAN_TYPE_OGK_SPK) ? DSP_MODE_OGK : DSP_MODE_OFF, (cnetz->sched_ts + 1) & 31);
cnetz_set_dsp_mode(cnetz, (cnetz->chan_type == CHAN_TYPE_OGK || cnetz->chan_type == CHAN_TYPE_OGK_SPK) ? DSP_MODE_OGK : DSP_MODE_OFF);
}
/* check for first phone in queue and trigger completion of call (becoming idle means that SpK is now available) */
trans = search_transaction_queue();
if (trans) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Now channel is available for queued subscriber '%s'.\n", transaction2rufnummer(trans));
trans_new_state(trans, (trans->state == TRANS_MT_QUEUE) ? TRANS_MT_DELAY : TRANS_MO_DELAY);
timer_stop(&trans->timer);
timer_start(&trans->timer, 2.0);
}
}
/* Initiate release connection on speech channel */
static void cnetz_release(transaction_t *trans, uint8_t cause)
{
trans_new_state(trans, (trans->cnetz->dsp_mode == DSP_MODE_OGK) ? TRANS_VA : TRANS_AF);
trans->repeat = 0;
trans->release_cause = cause;
trans->cnetz->sched_dsp_mode_ts = -1;
timer_stop(&trans->timer);
}
/* Receive audio from call instance. */
void call_down_audio(int callref, sample_t *samples, int count)
{
sender_t *sender;
cnetz_t *cnetz;
for (sender = sender_head; sender; sender = sender->next) {
cnetz = (cnetz_t *) sender;
if (cnetz->trans_list && cnetz->trans_list->callref == callref)
break;
}
if (!sender)
return;
if (cnetz->dsp_mode == DSP_MODE_SPK_V) {
/* store as is, since we convert rate when processing FSK frames */
jitter_save(&cnetz->sender.dejitter, samples, count);
}
}
void call_down_clock(void) {}
int call_down_setup(int callref, const char __attribute__((unused)) *caller_id, enum number_type __attribute__((unused)) caller_type, const char *dialing)
{
cnetz_t *ogk, *spk;
int rc;
int extended;
transaction_t *trans;
uint8_t futln_nat;
uint8_t futln_fuvst;
int futln_rest; /* use int for checking size > 65535 */
int ogk_kanal;
/* 1. split number into elements */
futln_nat = dialing[0] - '0';
if (dialing[7]) {
futln_fuvst = (dialing[1] - '0') * 10 + (dialing[2] - '0');
futln_rest = atoi(dialing + 3);
} else {
futln_fuvst = dialing[1] - '0';
futln_rest = atoi(dialing + 2);
}
/* 2. check if the subscriber is attached */
rc = find_db(futln_nat, futln_fuvst, futln_rest, &ogk_kanal, NULL, &extended);
if (rc < 0) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Outgoing call to not attached subscriber, rejecting!\n");
return -CAUSE_OUTOFORDER;
}
/* 3. check if given number is already in a call, return BUSY */
trans = search_transaction_number_global(futln_nat, futln_fuvst, futln_rest);
if (trans) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Outgoing call to busy number, rejecting!\n");
return -CAUSE_BUSY;
}
/* 4. check if we have no OgK, return NOCHANNEL */
ogk = search_ogk(ogk_kanal);
if (!ogk) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Outgoing call, but OgK is currently busy, rejecting!\n");
return -CAUSE_NOCHANNEL;
}
/* 5. check if all senders are busy, return NOCHANNEL */
spk = search_free_spk(extended);
if (!spk) {
if (!ogk->warteschlange) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Outgoing call, but no free channel, rejecting!\n");
return -CAUSE_NOCHANNEL;
} else
PDEBUG(DCNETZ, DEBUG_NOTICE, "Outgoing call, but no free channel, queuing call!\n");
}
PDEBUG(DCNETZ, DEBUG_INFO, "Call to mobile station, paging station id '%s'\n", dialing);
/* 6. trying to page mobile station */
trans = create_transaction(ogk, (spk) ? TRANS_VAK : TRANS_WSK, futln_nat, futln_fuvst, futln_rest, -1, -1, NAN);
if (!trans) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Failed to create transaction\n");
return -CAUSE_TEMPFAIL;
}
trans->callref = callref;
trans->try = 1;
return 0;
}
void call_down_answer(int __attribute__((unused)) callref)
{
}
/* Call control sends disconnect (with tones).
* An active call stays active, so tones and annoucements can be received
* by mobile station.
*/
void call_down_disconnect(int callref, int cause)
{
sender_t *sender;
cnetz_t *cnetz;
transaction_t *trans;
PDEBUG(DCNETZ, DEBUG_INFO, "Call has been disconnected by network.\n");
for (sender = sender_head; sender; sender = sender->next) {
cnetz = (cnetz_t *) sender;
/* search transaction for this callref */
trans = search_transaction_callref(cnetz, callref);
if (trans)
break;
}
if (!sender) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Outgoing disconnect, but no callref!\n");
call_up_release(callref, CAUSE_INVALCALLREF);
return;
}
/* Release when not active */
switch (cnetz->dsp_mode) {
case DSP_MODE_SPK_V:
return;
case DSP_MODE_SPK_K:
PDEBUG(DCNETZ, DEBUG_INFO, "Call control disconnects on speech channel, releasing towards mobile station.\n");
cnetz_release(trans, cnetz_cause_isdn2cnetz(cause));
call_up_release(callref, cause);
trans->callref = 0;
break;
default:
PDEBUG(DCNETZ, DEBUG_INFO, "Call control disconnects on organisation channel, removing transaction.\n");
call_up_release(callref, cause);
trans->callref = 0;
if (trans->state == TRANS_MT_QUEUE || trans->state == TRANS_MT_DELAY) {
cnetz_release(trans, cnetz_cause_isdn2cnetz(cause));
} else {
destroy_transaction(trans);
cnetz_go_idle(cnetz);
}
}
}
/* Call control releases call toward mobile station. */
void call_down_release(int callref, int cause)
{
sender_t *sender;
cnetz_t *cnetz;
transaction_t *trans;
PDEBUG(DCNETZ, DEBUG_INFO, "Call has been released by network, releasing call.\n");
for (sender = sender_head; sender; sender = sender->next) {
cnetz = (cnetz_t *) sender;
/* search transaction for this callref */
trans = search_transaction_callref(cnetz, callref);
if (trans)
break;
}
if (!sender) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Outgoing release, but no callref!\n");
/* don't send release, because caller already released */
return;
}
trans->callref = 0;
switch (cnetz->dsp_mode) {
case DSP_MODE_SPK_K:
case DSP_MODE_SPK_V:
PDEBUG(DCNETZ, DEBUG_INFO, "Call control releases on speech channel, releasing towards mobile station.\n");
cnetz_release(trans, cnetz_cause_isdn2cnetz(cause));
break;
default:
PDEBUG(DCNETZ, DEBUG_INFO, "Call control releases on organisation channel, removing transaction.\n");
if (trans->state == TRANS_MT_QUEUE) {
cnetz_release(trans, cnetz_cause_isdn2cnetz(cause));
} else {
destroy_transaction(trans);
cnetz_go_idle(cnetz);
}
}
}
int cnetz_meldeaufruf(uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest, int ogk_kanal)
{
cnetz_t *cnetz;
transaction_t *trans;
cnetz = search_ogk(ogk_kanal);
if (!cnetz) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "'Meldeaufruf', but OgK is currently busy!\n");
return -CAUSE_NOCHANNEL;
}
trans = create_transaction(cnetz, TRANS_MA, futln_nat, futln_fuvst, futln_rest, -1, -1, NAN);
if (!trans) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Failed to create transaction\n");
return -CAUSE_TEMPFAIL;
}
return 0;
}
static struct cnetz_channels {
enum cnetz_chan_type chan_type;
const char *short_name;
const char *long_name;
} cnetz_channels[] = {
{ CHAN_TYPE_OGK_SPK, "OgK/SpK","combined control & voice channel" },
{ CHAN_TYPE_OGK, "OgK", "control channel" },
{ CHAN_TYPE_SPK, "SpK", "voice channel" },
{ 0, NULL, NULL }
};
void cnetz_channel_list(void)
{
int i;
printf("Type\tDescription\n");
printf("------------------------------------------------------------------------\n");
for (i = 0; cnetz_channels[i].long_name; i++)
printf("%s\t%s\n", cnetz_channels[i].short_name, cnetz_channels[i].long_name);
}
int cnetz_channel_by_short_name(const char *short_name)
{
int i;
for (i = 0; cnetz_channels[i].short_name; i++) {
if (!strcasecmp(cnetz_channels[i].short_name, short_name))
return cnetz_channels[i].chan_type;
}
return -1;
}
const char *chan_type_short_name(enum cnetz_chan_type chan_type)
{
int i;
for (i = 0; cnetz_channels[i].short_name; i++) {
if (cnetz_channels[i].chan_type == chan_type)
return cnetz_channels[i].short_name;
}
return "invalid";
}
const char *chan_type_long_name(enum cnetz_chan_type chan_type)
{
int i;
for (i = 0; cnetz_channels[i].long_name; i++) {
if (cnetz_channels[i].chan_type == chan_type)
return cnetz_channels[i].long_name;
}
return "invalid";
}
/* Timeout handling */
void transaction_timeout(struct timer *timer)
{
transaction_t *trans = (transaction_t *)timer->priv;
cnetz_t *cnetz = trans->cnetz;
switch (trans->state) {
case TRANS_WAF:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "No response after dialing request 'Wahlaufforderung'\n");
if (trans->try == N) {
trans_new_state(trans, TRANS_WBN);
break;
}
trans->try++;
trans_new_state(trans, TRANS_VWG);
break;
case TRANS_MT_QUEUE:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Phone in queue, but still no channel available, releasing call!\n");
call_up_release(trans->callref, CAUSE_NOCHANNEL);
trans->callref = 0;
cnetz_release(trans, CNETZ_CAUSE_GASSENBESETZT);
break;
case TRANS_MO_QUEUE:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Phone in queue, but still no channel available, releasing!\n");
cnetz_release(trans, CNETZ_CAUSE_GASSENBESETZT);
break;
case TRANS_MT_DELAY:
trans_new_state(trans, TRANS_VAK);
break;
case TRANS_MO_DELAY:
trans_new_state(trans, TRANS_VAG);
break;
case TRANS_BQ:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "No response after channel allocation 'Belegung Quittung'\n");
trans_new_state(trans, TRANS_AF);
trans->repeat = 0;
break;
case TRANS_ZFZ:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "No response after sending random number 'Zufallszahl'\n");
if (trans->callref) {
call_up_release(trans->callref, CAUSE_TEMPFAIL);
trans->callref = 0;
}
cnetz_release(trans, CNETZ_CAUSE_FUNKTECHNISCH);
break;
case TRANS_AP:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "No response after waiting for challenge response 'Autorisierungsparameter'\n");
if (trans->callref) {
call_up_release(trans->callref, CAUSE_TEMPFAIL);
trans->callref = 0;
}
cnetz_release(trans, CNETZ_CAUSE_FUNKTECHNISCH);
break;
case TRANS_VHQ_K:
case TRANS_VHQ_V:
if (cnetz->dsp_mode != DSP_MODE_SPK_V)
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "No response while holding call 'Quittung Verbindung halten'\n");
else
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Lost signal from 'FuTln' (mobile station)\n");
if (trans->callref) {
call_up_release(trans->callref, CAUSE_TEMPFAIL);
trans->callref = 0;
}
cnetz_release(trans, CNETZ_CAUSE_FUNKTECHNISCH);
break;
case TRANS_DS:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "No response after connect 'Durchschalten'\n");
call_up_release(trans->callref, CAUSE_TEMPFAIL);
trans->callref = 0;
cnetz_release(trans, CNETZ_CAUSE_FUNKTECHNISCH);
break;
case TRANS_RTA:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "No response after ringing order 'Rufton anschalten'\n");
call_up_release(trans->callref, CAUSE_TEMPFAIL);
trans->callref = 0;
cnetz_release(trans, CNETZ_CAUSE_FUNKTECHNISCH);
break;
case TRANS_AHQ:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "No response after answer 'Abhebequittung'\n");
call_up_release(trans->callref, CAUSE_TEMPFAIL);
trans->callref = 0;
cnetz_release(trans, CNETZ_CAUSE_FUNKTECHNISCH);
break;
case TRANS_MFT:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "No response after keepalive order 'Meldeaufruf'\n");
/* no response to availability check */
trans->page_failed = 1;
destroy_transaction(trans);
break;
default:
PDEBUG_CHAN(DCNETZ, DEBUG_ERROR, "Timeout unhandled in state %" PRIu64 "\n", trans->state);
}
}
/*
* sync to phone
*
* because we don't know the actual delay on sound card, we need to sync
* to the phone, that is synced to us.
*
* if block is given, we can set sync to absolute position in super frame.
* if not, we just sync to the nearest block.
*/
void cnetz_sync_frame(cnetz_t *cnetz, double sync, int block)
{
double offset;
if (block >= 0) {
/* offset is the actual sync relative to bit_time */
offset = fmod(sync - BITS_PER_BLOCK * (double)block + BITS_PER_SUPERFRAME, BITS_PER_SUPERFRAME);
if (offset > BITS_PER_SUPERFRAME / 2)
offset -= BITS_PER_SUPERFRAME;
} else {
/* sync to the nearest block */
/* offset is the actual sync relative to bit_time */
offset = fmod(sync, BITS_PER_BLOCK);
if (offset > BITS_PER_BLOCK / 2)
offset -= BITS_PER_BLOCK;
}
/* if more than +- one bit out of sync */
if (offset < -0.5 || offset > 0.5) {
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Frame sync offset = %.2f, correcting!\n", offset);
fsk_correct_sync(&cnetz->fsk_demod, offset);
return;
}
/* resync by some fraction of received sync error */
PDEBUG_CHAN(DCNETZ, DEBUG_DEBUG, "Frame sync offset = %.2f, correcting.\n", offset);
fsk_correct_sync(&cnetz->fsk_demod, offset / 2.0);
}
/*
* OgK handling
*/
/* transmit rufblock */
const telegramm_t *cnetz_transmit_telegramm_rufblock(cnetz_t *cnetz)
{
static telegramm_t telegramm;
transaction_t *trans;
cnetz_t *spk;
memset(&telegramm, 0, sizeof(telegramm));
telegramm.opcode = OPCODE_LR_R;
telegramm.max_sendeleistung = cnetz_power2bits(cnetz->ms_power);
telegramm.bedingte_genauigkeit_der_fufst = si.genauigkeit;
telegramm.zeitschlitz_nr = cnetz->sched_ts;
telegramm.grenzwert_fuer_einbuchen_und_umbuchen = si.grenz_einbuchen;
telegramm.authentifikationsbit = si.authentifikationsbit;
telegramm.vermittlungstechnische_sperren = si.vermittlungstechnische_sperren;
telegramm.ws_kennung = si.ws_kennung;
telegramm.reduzierungsfaktor = si.reduzierung;
telegramm.fuz_nationalitaet = si.fuz_nat;
telegramm.fuz_fuvst_nr = si.fuz_fuvst;
telegramm.fuz_rest_nr = si.fuz_rest;
telegramm.kennung_fufst = si.kennung_fufst;
telegramm.nachbarschafts_prioritaets_bit = si.nachbar_prio;
telegramm.bewertung_nach_pegel_und_entfernung = si.bewertung;
telegramm.entfernungsangabe_der_fufst = si.entfernung;
telegramm.mittelungsfaktor_fuer_ausloesen = si.mittel_ausloesen;
telegramm.mittelungsfaktor_fuer_umschalten = si.mittel_umschalten;
telegramm.grenzwert_fuer_umschalten = si.grenz_umschalten;
telegramm.grenze_fuer_ausloesen = si.grenz_ausloesen;
trans = search_transaction(cnetz, TRANS_EM | TRANS_UM | TRANS_WBN | TRANS_WBP | TRANS_VAG | TRANS_VAK | TRANS_ATQ | TRANS_ATQ_IDLE | TRANS_VA | TRANS_WSK);
if (trans) {
telegramm.futln_nationalitaet = trans->futln_nat;
telegramm.futln_heimat_fuvst_nr = trans->futln_fuvst;
telegramm.futln_rest_nr = trans->futln_rest;
telegramm.ausloesegrund = trans->release_cause;
switch (trans->state) {
case TRANS_EM:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending acknowledgment 'Einbuchquittung' to Attachment request.\n");
telegramm.opcode = OPCODE_EBQ_R;
destroy_transaction(trans);
break;
case TRANS_UM:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending acknowledgment 'Umbuchquittung' to Roaming requuest.\n");
telegramm.opcode = OPCODE_UBQ_R;
destroy_transaction(trans);
break;
case TRANS_WBN:
wbn:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending call reject 'Wahlbestaetigung negativ'.\n");
telegramm.opcode = OPCODE_WBN_R;
destroy_transaction(trans);
cnetz_go_idle(cnetz);
break;
case TRANS_WBP:
spk = search_free_spk(trans->extended);
/* Accept call if channel available, otherwise reject or queue call */
if (spk) {
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending call accept 'Wahlbestaetigung positiv'.\n");
telegramm.opcode = OPCODE_WBP_R;
trans_new_state(trans, TRANS_VAG);
} else if (cnetz->warteschlange) {
/* queue call if no channel is available, but queue allowed */
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "No free channel, sending call accept in queue 'Wahlbestaetigung positiv in Warteschlage'.\n");
telegramm.opcode = OPCODE_WWBP_R;
trans_new_state(trans, TRANS_MO_QUEUE);
timer_start(&trans->timer, T_VAG2); /* Maximum time to hold queue */
} else {
PDEBUG(DCNETZ, DEBUG_NOTICE, "No free channel anymore, rejecting call!\n");
trans_new_state(trans, TRANS_WBN);
goto wbn;
}
break;
case TRANS_VAG:
case TRANS_VAK:
vak:
if (trans->state == TRANS_VAG) {
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending channel assignment 'Verbindungsaufbau gehend'.\n");
telegramm.opcode = OPCODE_VAG_R;
} else {
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending channel assignment 'Verbindungsaufbau kommend'.\n");
telegramm.opcode = OPCODE_VAK_R;
}
trans_new_state(trans, TRANS_BQ);
trans->repeat = 0;
timer_start(&trans->timer, 0.150 + 0.0375 * F_BQ); /* two slots + F_BQ frames */
/* select channel */
spk = search_free_spk(trans->extended);
if (!spk) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "No free channel anymore, rejecting call!\n");
destroy_transaction(trans);
cnetz_go_idle(cnetz);
break;
}
if (spk == cnetz) {
PDEBUG(DCNETZ, DEBUG_INFO, "Staying on combined control + traffic channel %s\n", spk->sender.kanal);
} else {
PDEBUG(DCNETZ, DEBUG_INFO, "Assigning phone to traffic channel %s\n", spk->sender.kanal);
/* sync RX time to current OgK time */
fsk_copy_sync(&spk->fsk_demod, &cnetz->fsk_demod);
}
/* set channel */
telegramm.frequenz_nr = spk->kanal;
/* change state to busy */
cnetz_new_state(spk, CNETZ_BUSY);
/* schedule switching two slots ahead */
cnetz_set_sched_dsp_mode(spk, DSP_MODE_SPK_K, (cnetz->sched_ts + 2) & 31);
/* relink */
unlink_transaction(trans);
link_transaction(trans, spk);
/* flush all other transactions, if any (in case of OgK/SpK) */
cnetz_flush_other_transactions(spk, trans);
break;
case TRANS_ATQ:
case TRANS_ATQ_IDLE:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending acknowledgment 'Quittung fuer Ausloesen des FuTelG im OgK-Betrieb' to release request.\n");
telegramm.opcode = OPCODE_ATQ_R;
destroy_transaction(trans);
break;
case TRANS_VA:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Vorzeitiges Ausloesen' to queued mobile station\n");
telegramm.opcode = OPCODE_VA_R;
destroy_transaction(trans);
break;
case TRANS_WSK:
spk = search_free_spk(trans->extended);
/* if channel becomes free before we send the queue information, we proceed with channel assignment */
if (spk) {
trans_new_state(trans, TRANS_VAK);
goto vak;
}
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "No free channel, sending incoming call in queue 'Warteschglange kommend'.\n");
telegramm.opcode = OPCODE_WSK_R;
trans_new_state(trans, TRANS_MT_QUEUE);
timer_start(&trans->timer, T_VAK); /* Maximum time to hold queue */
call_up_alerting(trans->callref);
default:
; /* LR */
}
}
return &telegramm;
}
/* transmit meldeblock */
const telegramm_t *cnetz_transmit_telegramm_meldeblock(cnetz_t *cnetz)
{
static telegramm_t telegramm;
transaction_t *trans;
memset(&telegramm, 0, sizeof(telegramm));
telegramm.opcode = OPCODE_MLR_M;
telegramm.max_sendeleistung = cnetz_power2bits(cnetz->ms_power);
telegramm.ogk_verkehrsanteil = 0; /* must be 0 or phone might not respond to messages in different slot */
telegramm.teilnehmergruppensperre = si.teilnehmergruppensperre;
telegramm.anzahl_gesperrter_teilnehmergruppen = si.anzahl_gesperrter_teilnehmergruppen;
if (ogk_list_count) {
/* if we have alternative OGKs, we cycle through the list and indicate their channels */
telegramm.ogk_vorschlag = ogk_list[ogk_list_index]->kanal;
if (++ogk_list_index == ogk_list_count)
ogk_list_index = 0;
} else
telegramm.ogk_vorschlag = CNETZ_STD_OGK_KANAL;
telegramm.fuz_rest_nr = si.fuz_rest;
trans = search_transaction(cnetz, TRANS_VWG | TRANS_MA);
if (trans) {
switch (trans->state) {
case TRANS_VWG:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending acknowledgment 'Wahlaufforderung' to outging call\n");
telegramm.opcode = OPCODE_WAF_M;
telegramm.futln_nationalitaet = trans->futln_nat;
telegramm.futln_heimat_fuvst_nr = trans->futln_fuvst;
telegramm.futln_rest_nr = trans->futln_rest;
trans_new_state(trans, TRANS_WAF);
timer_start(&trans->timer, 1.0); /* Wait two slot cycles until resending */
break;
case TRANS_MA:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending keepalive request 'Meldeaufruf'\n");
telegramm.opcode = OPCODE_MA_M;
telegramm.futln_nationalitaet = trans->futln_nat;
telegramm.futln_heimat_fuvst_nr = trans->futln_fuvst;
telegramm.futln_rest_nr = trans->futln_rest;
trans_new_state(trans, TRANS_MFT);
timer_start(&trans->timer, 1.0); /* Wait two slot cycles until timeout */
break;
default:
; /* MLR */
}
}
return &telegramm;
}
void cnetz_receive_telegramm_ogk(cnetz_t *cnetz, telegramm_t *telegramm, int block)
{
uint8_t opcode = telegramm->opcode;
int valid_frame = 0;
transaction_t *trans;
const char *rufnummer;
switch (opcode) {
case OPCODE_EM_R:
if (!match_fuz(telegramm))
break;
rufnummer = telegramm2rufnummer(telegramm);
if (si.authentifikationsbit && telegramm->chipkarten_futelg_bit)
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received Attachment 'Einbuchen' message from Subscriber '%s' with chip card's ID %d (vendor id %d, hardware version %d, software version %d)\n", rufnummer, telegramm->kartenkennung, telegramm->herstellerkennung, telegramm->hardware_des_futelg, telegramm->software_des_futelg);
else
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received Attachment 'Einbuchen' message from Subscriber '%s' with %s card's security code %d\n", rufnummer, (telegramm->chipkarten_futelg_bit) ? "chip":"magnet", telegramm->sicherungs_code);
if (telegramm->erweitertes_frequenzbandbit)
PDEBUG(DCNETZ, DEBUG_INFO, " -> Phone supports extended frequency band\n");
if (cnetz->state != CNETZ_IDLE) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Ignoring Attachment from subscriber '%s', because we are busy becoming SpK.\n", rufnummer);
break;
}
trans = create_transaction(cnetz, TRANS_EM, telegramm->futln_nationalitaet, telegramm->futln_heimat_fuvst_nr, telegramm->futln_rest_nr, telegramm->chipkarten_futelg_bit, telegramm->erweitertes_frequenzbandbit, cnetz->rf_level_db);
if (!trans) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Failed to create transaction\n");
break;
}
cnetz = trans->cnetz; /* cnetz may change, due to stronger reception on different OgK */
valid_frame = 1;
break;
case OPCODE_UM_R:
if (!match_fuz(telegramm))
break;
rufnummer = telegramm2rufnummer(telegramm);
if (si.authentifikationsbit && telegramm->chipkarten_futelg_bit)
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received Roaming 'Umbuchen' message from Subscriber '%s' with chip card's ID %d (vendor id %d, hardware version %d, software version %d)\n", rufnummer, telegramm->kartenkennung, telegramm->herstellerkennung, telegramm->hardware_des_futelg, telegramm->software_des_futelg);
else
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received Roaming 'Umbuchen' message from Subscriber '%s' with %s card's security code %d\n", rufnummer, (telegramm->chipkarten_futelg_bit) ? "chip":"magnet", telegramm->sicherungs_code);
if (telegramm->erweitertes_frequenzbandbit)
PDEBUG(DCNETZ, DEBUG_INFO, " -> Phone supports extended frequency band\n");
if (cnetz->state != CNETZ_IDLE) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Ignoring Roaming from subscriber '%s', because we are busy becoming SpK.\n", rufnummer);
break;
}
trans = create_transaction(cnetz, TRANS_UM, telegramm->futln_nationalitaet, telegramm->futln_heimat_fuvst_nr, telegramm->futln_rest_nr, telegramm->chipkarten_futelg_bit, telegramm->erweitertes_frequenzbandbit, cnetz->rf_level_db);
if (!trans) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Failed to create transaction\n");
break;
}
cnetz = trans->cnetz; /* cnetz may change, due to stronger reception on different OgK */
valid_frame = 1;
break;
case OPCODE_UWG_R:
case OPCODE_UWK_R:
if (!match_fuz(telegramm))
break;
rufnummer = telegramm2rufnummer(telegramm);
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received Roaming request 'Umbuchantrag' message from Subscriber '%s' on queue\n", rufnummer);
break;
case OPCODE_VWG_R:
case OPCODE_SRG_R:
case OPCODE_NUG_R:
if (!match_fuz(telegramm))
break;
rufnummer = telegramm2rufnummer(telegramm);
if (opcode == OPCODE_VWG_R)
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received outgoing Call 'Verbindungswunsch gehend' message from Subscriber '%s'\n", rufnummer);
else if (opcode == OPCODE_SRG_R)
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received outgoing emergency Call 'Sonderruf gehend' message from Subscriber '%s'\n", rufnummer);
else
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received outgoing Call 'Verbindungswunsch gehend bei Nachbarschaftsunterstuetzung' message from Subscriber '%s'\n", rufnummer);
if (cnetz->state != CNETZ_IDLE) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Ignoring Call from subscriber '%s', because we are busy becoming SpK.\n", rufnummer);
break;
}
trans = create_transaction(cnetz, TRANS_VWG, telegramm->futln_nationalitaet, telegramm->futln_heimat_fuvst_nr, telegramm->futln_rest_nr, -1, telegramm->erweitertes_frequenzbandbit, cnetz->rf_level_db);
if (!trans) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Failed to create transaction\n");
break;
}
cnetz = trans->cnetz; /* cnetz may change, due to stronger reception on different OgK */
trans->try = 1;
valid_frame = 1;
break;
case OPCODE_WUE_M:
trans = search_transaction(cnetz, TRANS_WAF | TRANS_WBP | TRANS_VAG | TRANS_MO_QUEUE);
if (!trans) {
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Received dialing digits 'Wahluebertragung' message without transaction (on this OgK), ignoring!\n");
break;
}
rufnummer = transaction2rufnummer(trans);
strncpy(trans->dialing, telegramm->wahlziffern, sizeof(trans->dialing) - 1);
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received dialing digits 'Wahluebertragung' message from Subscriber '%s' to Number '%s'\n", rufnummer, trans->dialing);
timer_stop(&trans->timer);
trans_new_state(trans, TRANS_WBP);
trans->try = 1; /* try */
valid_frame = 1;
break;
case OPCODE_ATO_R:
if (!match_fuz(telegramm))
break;
rufnummer = telegramm2rufnummer(telegramm);
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received release 'Ausloesen des FuTelG im OgK-Betrieb bei WS' message from Subscriber '%s'\n", rufnummer);
trans = search_transaction_number_global(telegramm->futln_nationalitaet, telegramm->futln_heimat_fuvst_nr, telegramm->futln_rest_nr);
if (!trans) {
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "There is no transaction, so we assume that the phone did not receive previous release.\n");
/* create transaction, in case the phone repeats the release after we have acked it */
trans = create_transaction(cnetz, TRANS_ATQ_IDLE, telegramm->futln_nationalitaet, telegramm->futln_heimat_fuvst_nr, telegramm->futln_rest_nr, -1, -1, cnetz->rf_level_db);
if (!trans) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Failed to create transaction\n");
break;
}
cnetz = trans->cnetz; /* cnetz may change, due to stronger reception on different OgK */
} else {
if (cnetz == trans->cnetz) {
timer_stop(&trans->timer);
trans_new_state(trans, TRANS_ATQ);
} else
if (trans->state == TRANS_ATQ_IDLE) {
trans = create_transaction(cnetz, TRANS_ATQ_IDLE, telegramm->futln_nationalitaet, telegramm->futln_heimat_fuvst_nr, telegramm->futln_rest_nr, -1, -1, cnetz->rf_level_db);
if (!trans) {
PDEBUG(DCNETZ, DEBUG_ERROR, "Failed to create transaction\n");
break;
}
cnetz = trans->cnetz; /* cnetz may change, due to stronger reception on different OgK */
} else
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Received release 'Ausloesen des FuTelG im OgK-Betrieb bei WS' message without transaction (on this OgK), ignoring!\n");
}
valid_frame = 1;
break;
case OPCODE_MFT_M:
if (!match_fuz(telegramm))
break;
trans = search_transaction_number(cnetz, telegramm->futln_nationalitaet, telegramm->futln_heimat_fuvst_nr, telegramm->futln_rest_nr);
if (!trans) {
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Received acknowledge 'Meldung Funktelefonteilnehmer' message without transaction (on this OgK), ignoring!\n");
break;
}
rufnummer = transaction2rufnummer(trans);
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received acknowledge 'Meldung Funktelefonteilnehmer' message from Subscriber '%s'\n", rufnummer);
destroy_transaction(trans);
valid_frame = 1;
break;
default:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Received unexpected Telegramm (opcode %d = %s)\n", opcode, telegramm_name(opcode));
}
if (cnetz->sender.loopback) {
fprintf(stderr, "we don't know TS here, but we are in loopback mode. in loopback mode call to this function shall never happen. please fix or find a way to know when the time slot was received!\n");
abort();
}
if (valid_frame)
cnetz_sync_frame(cnetz, telegramm->sync_time, block);
}
/*
* SpK handling
*/
/* transmit concentrated messages */
const telegramm_t *cnetz_transmit_telegramm_spk_k(cnetz_t *cnetz)
{
static telegramm_t telegramm;
transaction_t *trans = cnetz->trans_list;
int ogk_kanal;
cnetz_t *ogk;
int rc;
if (!trans)
return NULL;
memset(&telegramm, 0, sizeof(telegramm));
telegramm.max_sendeleistung = cnetz_power2bits(cnetz->ms_power);
telegramm.sendeleistungsanpassung = (cnetz->ms_power < 8) ? 1 : 0;
telegramm.entfernung = si.entfernung;
telegramm.fuz_nationalitaet = si.fuz_nat;
telegramm.fuz_fuvst_nr = si.fuz_fuvst;
telegramm.fuz_rest_nr = si.fuz_rest;
telegramm.futln_nationalitaet = trans->futln_nat;
telegramm.futln_heimat_fuvst_nr = trans->futln_fuvst;
telegramm.futln_rest_nr = trans->futln_rest;
telegramm.frequenz_nr = cnetz->kanal;
telegramm.bedingte_genauigkeit_der_fufst = si.genauigkeit;
telegramm.zufallszahl = cnetz->challenge;
switch (trans->state) {
case TRANS_BQ:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Belegungsquittung' on traffic channel\n");
telegramm.opcode = OPCODE_BQ_K;
if (++trans->repeat >= 8 && !timer_running(&trans->timer)) {
if (cnetz->challenge_valid) {
if (si.authentifikationsbit == 0) {
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Cannot authenticate, because base station does not support it. (Authentication disabled in sysinfo.)\n");
goto no_auth;
}
if (trans->futelg_bit == 0) {
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Cannot authenticate, because mobile station does not support it. (Mobile station has magnetic card.)\n");
goto no_auth;
}
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Perform authentication with subscriber's card, use challenge: 0x%016" PRIx64 "\n", telegramm.zufallszahl);
trans_new_state(trans, TRANS_ZFZ);
timer_start(&trans->timer, 0.0375 * F_ZFZ); /* F_ZFZ frames */
} else {
no_auth:
trans_new_state(trans, TRANS_VHQ_K);
timer_start(&trans->timer, 0.0375 * F_VHQK); /* F_VHQK frames */
}
trans->repeat = 0;
}
break;
case TRANS_ZFZ:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Zufallszahl' on traffic channel (0x%016" PRIx64 ").\n", telegramm.zufallszahl);
telegramm.opcode = OPCODE_ZFZ_K;
break;
case TRANS_AP:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Quittung Verbindung halten' on traffic channel\n");
telegramm.opcode = OPCODE_VHQ_K;
break;
case TRANS_VHQ_K:
if (!cnetz->sender.loopback)
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Quittung Verbindung halten' on traffic channel\n");
telegramm.opcode = OPCODE_VHQ_K;
/* continue until next sub frame, so we send DS from first block of next sub frame. */
if (!cnetz->sender.loopback && (cnetz->sched_ts & 7) == 7 && cnetz->sched_r_m && !timer_running(&trans->timer)) {
/* next sub frame */
if (trans->mo_call) {
trans->callref = call_up_setup(transaction2rufnummer(trans), trans->dialing, OSMO_CC_NETWORK_CNETZ_NONE, "");
trans_new_state(trans, TRANS_DS);
trans->repeat = 0;
timer_start(&trans->timer, 0.0375 * F_DS); /* F_DS frames */
}
if (trans->mt_call) {
trans_new_state(trans, TRANS_RTA);
timer_start(&trans->timer, 0.0375 * F_RTA); /* F_RTA frames */
trans->repeat = 0;
call_up_alerting(trans->callref);
}
}
break;
case TRANS_DS:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Durchschalten' on traffic channel\n");
telegramm.opcode = OPCODE_DSB_K;
/* send exactly a sub frame (8 time slots) */
if ((cnetz->sched_ts & 7) == 7 && cnetz->sched_r_m && !timer_running(&trans->timer)) {
/* next sub frame */
trans_new_state(trans, TRANS_VHQ_V);
trans->repeat = 0;
cnetz_set_sched_dsp_mode(cnetz, DSP_MODE_SPK_V, (cnetz->sched_ts + 1) & 31);
#ifndef DEBUG_SPK
timer_start(&trans->timer, 0.075 + 0.6 * F_VHQ); /* one slot + F_VHQ frames */
#endif
}
break;
case TRANS_RTA:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Rufton anschalten' on traffic channel\n");
telegramm.opcode = OPCODE_RTA_K;
break;
case TRANS_AHQ:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Abhebe Quittung' on traffic channel\n");
telegramm.opcode = OPCODE_AHQ_K;
if ((cnetz->sched_ts & 7) == 7 && cnetz->sched_r_m) {
/* next sub frame */
trans_new_state(trans, TRANS_VHQ_V);
trans->repeat = 0;
cnetz_set_sched_dsp_mode(cnetz, DSP_MODE_SPK_V, (cnetz->sched_ts + 1) & 31);
timer_start(&trans->timer, 0.075 + 0.6 * F_VHQ); /* one slot + F_VHQ frames */
}
break;
case TRANS_AF:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Ausloesen durch FuFSt' on traffic channel\n");
telegramm.opcode = OPCODE_AF_K;
if (++trans->repeat < N_AFKT)
break;
if (!trans->try) {
/* no retry */
destroy_transaction(trans);
cnetz_go_idle(cnetz);
break;
}
if (trans->try == N) {
PDEBUG(DCNETZ, DEBUG_INFO, "Maximum retries, removing transaction\n");
/* no response to incomming call */
trans->page_failed = 1;
cnetz_release(trans, CNETZ_CAUSE_FUNKTECHNISCH);
if (trans->callref)
call_up_release(trans->callref, CAUSE_TEMPFAIL);
/* must destroy transaction after cnetz_release */
destroy_transaction(trans);
cnetz_go_idle(cnetz);
break;
}
/* remove call from SpK (or OgK+SpK) */
unlink_transaction(trans);
/* idle channel */
cnetz_go_idle(cnetz);
/* alloc ogk again */
rc = find_db(trans->futln_nat, trans->futln_fuvst, trans->futln_rest, &ogk_kanal, NULL, NULL);
if (rc < 0) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Cannot find subscriber in database anymore, releasing!\n");
goto no_ogk;
}
ogk = search_ogk(ogk_kanal);
if (!ogk) {
PDEBUG(DCNETZ, DEBUG_NOTICE, "Cannot retry, because currently no OgK available (busy)\n");
no_ogk:
cnetz_release(trans, CNETZ_CAUSE_FUNKTECHNISCH);
if (trans->callref)
call_up_release(trans->callref, CAUSE_NOCHANNEL);
/* must destroy transaction after cnetz_release */
destroy_transaction(trans);
break;
}
PDEBUG(DCNETZ, DEBUG_INFO, "Retry to assign channel.\n");
/* attach call to OgK */
link_transaction(trans, ogk);
/* change state */
if (trans->mo_call)
trans_new_state(trans, TRANS_WBP);
if (trans->mt_call)
trans_new_state(trans, TRANS_VAK);
trans->try++;
break;
case TRANS_AT:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Auslosen durch FuFst' on traffic channel\n");
telegramm.opcode = OPCODE_AF_K;
if (++trans->repeat == 1) {
destroy_transaction(trans);
cnetz_go_idle(cnetz);
}
break;
}
return &telegramm;
}
/* receive concentrated messages */
void cnetz_receive_telegramm_spk_k(cnetz_t *cnetz, telegramm_t *telegramm)
{
uint8_t opcode = telegramm->opcode;
int valid_frame = 0;
transaction_t *trans = cnetz->trans_list;
if (!trans)
return;
switch (opcode) {
case OPCODE_BEL_K:
if (!match_fuz(telegramm)) {
break;
}
if (!match_futln(telegramm, trans->futln_nat, trans->futln_fuvst, trans->futln_rest)) {
break;
}
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received allocation 'Belegung' message.\n");
valid_frame = 1;
if (trans->state != TRANS_BQ)
break;
timer_stop(&trans->timer);
trans->try = 0;
break;
case OPCODE_DSQ_K:
if (!match_fuz(telegramm)) {
break;
}
if (!match_futln(telegramm, trans->futln_nat, trans->futln_fuvst, trans->futln_rest)) {
break;
}
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received assignment confirm 'Durchschaltung Quittung' message.\n");
valid_frame = 1;
if (trans->state != TRANS_DS)
break;
cnetz->scrambler = telegramm->betriebs_art;
cnetz->scrambler_switch = 0;
timer_stop(&trans->timer);
break;
case OPCODE_ZFZQ_K:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received random number acknowledge 'Zufallszahlquittung' message.\n");
valid_frame = 1;
if (trans->state != TRANS_ZFZ)
break;
if (cnetz->challenge != telegramm->zufallszahl) {
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Received random number acknowledge (0x%016" PRIx64 ") does not match the transmitted one (0x%016" PRIx64 "), ignoring!\n", telegramm->zufallszahl, cnetz->challenge);
break;
}
timer_stop(&trans->timer);
trans_new_state(trans, TRANS_AP);
timer_start(&trans->timer, T_AP); /* 750 milliseconds */
break;
case OPCODE_AP_K:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received challenge response 'Autorisierungsparameter' message (0x%016" PRIx64 ").\n", telegramm->authorisierungsparameter);
valid_frame = 1;
if (trans->state != TRANS_AP)
break;
/* if authentication response from card does not match */
if (cnetz->response_valid && telegramm->authorisierungsparameter != cnetz->response) {
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Received challenge response (0x%016" PRIx64 ") does not match the expected one (0x%016" PRIx64 "), releasing!\n", telegramm->authorisierungsparameter, cnetz->response);
if (trans->callref) {
call_up_release(trans->callref, CAUSE_TEMPFAIL); /* jolly guesses that */
trans->callref = 0;
}
cnetz_release(trans, CNETZ_CAUSE_GASSENBESETZT); /* when authentication is not valid */
break;
}
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Completed authentication with subscriber's card, challenge response: 0x%016" PRIx64 "\n", telegramm->authorisierungsparameter);
timer_stop(&trans->timer);
trans_new_state(trans, TRANS_VHQ_K);
timer_start(&trans->timer, 0.0375 * F_VHQK); /* F_VHQK frames */
break;
case OPCODE_VH_K:
if (!match_fuz(telegramm)) {
break;
}
if (!match_futln(telegramm, trans->futln_nat, trans->futln_fuvst, trans->futln_rest)) {
break;
}
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received connection hold 'Verbindung halten' message.\n");
valid_frame = 1;
if (trans->state != TRANS_VHQ_K)
break;
timer_stop(&trans->timer);
break;
case OPCODE_RTAQ_K:
if (!match_fuz(telegramm)) {
break;
}
if (!match_futln(telegramm, trans->futln_nat, trans->futln_fuvst, trans->futln_rest)) {
break;
}
valid_frame = 1;
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received ringback 'Rufton anschalten Quittung' message.\n");
if (trans->state != TRANS_RTA)
break;
timer_start(&trans->timer, 0.0375 * F_RTA); /* F_RTA frames */
break;
case OPCODE_AH_K:
if (!match_fuz(telegramm)) {
break;
}
if (!match_futln(telegramm, trans->futln_nat, trans->futln_fuvst, trans->futln_rest)) {
break;
}
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received answer frame 'Abheben' message.\n");
valid_frame = 1;
/* if already received this frame, or if we are already on VHQ or if we are releasing */
if (trans->state == TRANS_AHQ || trans->state == TRANS_VHQ_K || trans->state == TRANS_VHQ_V || trans->state == TRANS_AF)
break;
cnetz->scrambler = telegramm->betriebs_art;
cnetz->scrambler_switch = 0;
trans_new_state(trans, TRANS_AHQ);
trans->repeat = 0;
timer_stop(&trans->timer);
call_up_answer(trans->callref, transaction2rufnummer(trans));
break;
case OPCODE_AT_K:
if (!match_fuz(telegramm)) {
break;
}
if (!match_futln(telegramm, trans->futln_nat, trans->futln_fuvst, trans->futln_rest)) {
break;
}
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received release frame 'Ausloesen durch FuTln' message.\n");
valid_frame = 1;
/* if already received this frame, if we are releasing */
if (trans->state == TRANS_AT || trans->state == TRANS_AF)
break;
trans_new_state(trans, TRANS_AT);
trans->repeat = 0;
timer_stop(&trans->timer);
if (trans->callref) {
call_up_release(trans->callref, CAUSE_NORMAL);
trans->callref = 0;
}
break;
default:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Received unexpected Telegramm (opcode %d = %s)\n", opcode, telegramm_name(opcode));
}
if (valid_frame)
cnetz_sync_frame(cnetz, telegramm->sync_time, -1);
}
/* transmit distributed messages */
const telegramm_t *cnetz_transmit_telegramm_spk_v(cnetz_t *cnetz)
{
static telegramm_t telegramm;
transaction_t *trans = cnetz->trans_list;
int meter = 0;
if (!trans)
return NULL;
memset(&telegramm, 0, sizeof(telegramm));
if (cnetz->metering) {
double now = get_time();
if (!trans->call_start)
trans->call_start = now;
meter = (now - trans->call_start) / (double)cnetz->metering + 1;
}
telegramm.max_sendeleistung = cnetz_power2bits(cnetz->ms_power);
telegramm.sendeleistungsanpassung = (cnetz->ms_power < 8) ? 1 : 0;
telegramm.ankuendigung_gespraechsende = 0;
telegramm.gebuehren_stand = meter;
telegramm.fuz_nationalitaet = si.fuz_nat;
telegramm.fuz_fuvst_nr = si.fuz_fuvst;
telegramm.fuz_rest_nr = si.fuz_rest;
telegramm.futln_nationalitaet = trans->futln_nat;
telegramm.futln_heimat_fuvst_nr = trans->futln_fuvst;
telegramm.futln_rest_nr = trans->futln_rest;
telegramm.frequenz_nr = cnetz->kanal;
telegramm.entfernung = si.entfernung;
telegramm.bedingte_genauigkeit_der_fufst = si.genauigkeit;
telegramm.gueltigkeit_des_gebuehrenstandes = 0;
telegramm.ausloesegrund = trans->release_cause;
switch (trans->state) {
case TRANS_VHQ_V:
if ((cnetz->sched_ts & 8) == 0) { /* sub frame 1 and 3 */
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Quittung Verbindung halten 1' on traffic channel\n");
telegramm.opcode = OPCODE_VHQ1_V;
} else { /* sub frame 2 and 4 */
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Quittung Verbindung halten 2' on traffic channel\n");
telegramm.opcode = OPCODE_VHQ2_V;
}
break;
case TRANS_AF:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending 'Ausloesen durch FuFSt' on traffic channel\n");
telegramm.opcode = OPCODE_AF_V;
if (++trans->repeat == N_AFV) {
destroy_transaction(trans);
cnetz_go_idle(cnetz);
}
break;
case TRANS_AT:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Sending acknowledge to 'Ausloesen durch FuTln' on traffic channel\n");
telegramm.opcode = OPCODE_AF_V;
if (++trans->repeat == 1) {
destroy_transaction(trans);
cnetz_go_idle(cnetz);
}
break;
}
return &telegramm;
}
/* receive distributed messages */
void cnetz_receive_telegramm_spk_v(cnetz_t *cnetz, telegramm_t *telegramm)
{
uint8_t opcode = telegramm->opcode;
int valid_frame = 0;
transaction_t *trans = cnetz->trans_list;
if (!trans)
return;
switch (opcode) {
case OPCODE_VH_V:
case OPCODE_USAI_V:
case OPCODE_USAE_V:
if (!match_fuz(telegramm)) {
break;
}
if (!match_futln(telegramm, trans->futln_nat, trans->futln_fuvst, trans->futln_rest)) {
break;
}
if (trans->state != TRANS_VHQ_V)
break;
timer_start(&trans->timer, 0.6 * F_VHQ); /* F_VHQ frames */
switch (opcode) {
case OPCODE_VH_V:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received supervisory frame 'Verbindung halten' message%s.\n", (telegramm->test_telefonteilnehmer_geraet) ? ", phone is a test-phone" : "");
break;
case OPCODE_USAI_V:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received internal handover request frame 'Umschaltantrag intern' message%s.\n", (telegramm->test_telefonteilnehmer_geraet) ? ", phone is a test-phone" : "");
break;
case OPCODE_USAE_V:
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received external handover request frame 'Umschaltantrag extern' message%s.\n", (telegramm->test_telefonteilnehmer_geraet) ? ", phone is a test-phone" : "");
break;
}
valid_frame = 1;
if (cnetz->scrambler != telegramm->betriebs_art) {
/* if the scrambler mode changes, we wait 3 frames */
/* i guess that this was implemented to prevent switching by one corrupt frame. */
if (++cnetz->scrambler_switch >= 3) {
cnetz->scrambler = telegramm->betriebs_art;
cnetz->scrambler_switch = 0;
}
} else
cnetz->scrambler_switch = 0;
break;
case OPCODE_AT_V:
if (!match_fuz(telegramm)) {
break;
}
if (!match_futln(telegramm, trans->futln_nat, trans->futln_fuvst, trans->futln_rest)) {
break;
}
PDEBUG_CHAN(DCNETZ, DEBUG_INFO, "Received release frame 'Ausloesen durch FuTln' message.\n");
valid_frame = 1;
/* if already received this frame, if we are releasing */
if (trans->state == TRANS_AT || trans->state == TRANS_AF)
break;
trans_new_state(trans, TRANS_AT);
trans->repeat = 0;
timer_stop(&trans->timer);
if (trans->callref) {
call_up_release(trans->callref, CAUSE_NORMAL);
trans->callref = 0;
}
break;
default:
PDEBUG_CHAN(DCNETZ, DEBUG_NOTICE, "Received unexpected Telegramm (opcode %d = %s)\n", opcode, telegramm_name(opcode));
}
if (valid_frame)
cnetz_sync_frame(cnetz, telegramm->sync_time, -1);
}
void dump_info(void)
{
dump_db();
}
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