676 lines
16 KiB
C
676 lines
16 KiB
C
/* GSM 08.08 like API for OpenBSC. The bridge from MSC to BSC */
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/* (C) 2010 by Holger Hans Peter Freyther
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* (C) 2010 by On-Waves
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* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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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 <openbsc/bsc_api.h>
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#include <openbsc/bsc_rll.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/gsm_subscriber.h>
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#include <openbsc/signal.h>
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#include <openbsc/abis_rsl.h>
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#include <openbsc/chan_alloc.h>
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#include <openbsc/handover.h>
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#include <openbsc/debug.h>
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#include <openbsc/gsm_04_08.h>
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#include <osmocore/protocol/gsm_08_08.h>
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#include <osmocore/talloc.h>
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#define GSM0808_T10_VALUE 6, 0
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static LLIST_HEAD(sub_connections);
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static void rll_ind_cb(struct gsm_lchan *, uint8_t, void *, enum bsc_rllr_ind);
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static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id);
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static void handle_release(struct gsm_subscriber_connection *conn, struct bsc_api *bsc, struct gsm_lchan *lchan);
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static void handle_chan_ack(struct gsm_subscriber_connection *conn, struct bsc_api *bsc, struct gsm_lchan *lchan);
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static void handle_chan_nack(struct gsm_subscriber_connection *conn, struct bsc_api *bsc, struct gsm_lchan *lchan);
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/* GSM 08.08 3.2.2.33 */
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static u_int8_t lchan_to_chosen_channel(struct gsm_lchan *lchan)
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{
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u_int8_t channel_mode = 0, channel = 0;
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switch (lchan->tch_mode) {
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case GSM48_CMODE_SPEECH_V1:
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case GSM48_CMODE_SPEECH_EFR:
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case GSM48_CMODE_SPEECH_AMR:
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channel_mode = 0x9;
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break;
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case GSM48_CMODE_SIGN:
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channel_mode = 0x8;
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break;
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case GSM48_CMODE_DATA_14k5:
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channel_mode = 0xe;
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break;
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case GSM48_CMODE_DATA_12k0:
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channel_mode = 0xb;
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break;
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case GSM48_CMODE_DATA_6k0:
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channel_mode = 0xc;
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break;
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case GSM48_CMODE_DATA_3k6:
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channel_mode = 0xd;
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break;
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}
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switch (lchan->type) {
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case GSM_LCHAN_NONE:
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channel = 0x0;
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break;
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case GSM_LCHAN_SDCCH:
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channel = 0x1;
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break;
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case GSM_LCHAN_TCH_F:
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channel = 0x8;
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break;
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case GSM_LCHAN_TCH_H:
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channel = 0x9;
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break;
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case GSM_LCHAN_UNKNOWN:
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LOGP(DMSC, LOGL_ERROR, "Unknown lchan type: %p\n", lchan);
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break;
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}
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return channel_mode << 4 | channel;
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}
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static u_int8_t chan_mode_to_speech(struct gsm_lchan *lchan)
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{
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int mode = 0;
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switch (lchan->tch_mode) {
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case GSM48_CMODE_SPEECH_V1:
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mode = 1;
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break;
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case GSM48_CMODE_SPEECH_EFR:
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mode = 0x11;
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break;
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case GSM48_CMODE_SPEECH_AMR:
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mode = 0x21;
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break;
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case GSM48_CMODE_SIGN:
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case GSM48_CMODE_DATA_14k5:
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case GSM48_CMODE_DATA_12k0:
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case GSM48_CMODE_DATA_6k0:
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case GSM48_CMODE_DATA_3k6:
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default:
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LOGP(DMSC, LOGL_ERROR, "Using non speech mode: %d\n", mode);
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return 0;
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break;
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}
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/* assume to always do AMR HR on any TCH type */
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if (lchan->type == GSM_LCHAN_TCH_H ||
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lchan->tch_mode == GSM48_CMODE_SPEECH_AMR)
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mode |= 0x4;
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return mode;
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}
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static void assignment_t10_timeout(void *_conn)
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{
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struct bsc_api *api;
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struct gsm_subscriber_connection *conn =
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(struct gsm_subscriber_connection *) _conn;
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LOGP(DMSC, LOGL_ERROR, "Assigment T10 timeout on %p\n", conn);
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/* normal release on the secondary channel */
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lchan_release(conn->secondary_lchan, 0, 1);
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conn->secondary_lchan = NULL;
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/* inform them about the failure */
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api = conn->bts->network->bsc_api;
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api->assign_fail(conn, GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, NULL);
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}
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/*
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* Start a new assignment and make sure that it is completed within T10 either
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* positively, negatively or by the timeout.
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*
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* 1.) allocate a new lchan
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* 2.) copy the encryption key and other data from the
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* old to the new channel.
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* 3.) RSL Channel Activate this channel and wait
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*
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* -> Signal handler for the LCHAN
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* 4.) Send GSM 04.08 assignment command to the MS
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*
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* -> Assignment Complete/Assignment Failure
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* 5.) Release the SDCCH, continue signalling on the new link
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*/
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static int handle_new_assignment(struct gsm_subscriber_connection *conn, int chan_mode, int full_rate)
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{
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struct gsm_lchan *new_lchan;
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int chan_type;
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chan_type = full_rate ? GSM_LCHAN_TCH_F : GSM_LCHAN_TCH_H;
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new_lchan = lchan_alloc(conn->bts, chan_type, 0);
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if (!new_lchan) {
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LOGP(DMSC, LOGL_NOTICE, "No free channel.\n");
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return -1;
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}
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/* copy old data to the new channel */
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memcpy(&new_lchan->encr, &conn->lchan->encr, sizeof(new_lchan->encr));
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new_lchan->ms_power = conn->lchan->ms_power;
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new_lchan->bs_power = conn->lchan->bs_power;
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/* copy new data to it */
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new_lchan->tch_mode = chan_mode;
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new_lchan->rsl_cmode = RSL_CMOD_SPD_SPEECH;
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/* handle AMR correctly */
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if (chan_mode == GSM48_CMODE_SPEECH_AMR) {
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new_lchan->mr_conf.ver = 1;
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new_lchan->mr_conf.icmi = 1;
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new_lchan->mr_conf.m5_90 = 1;
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}
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if (rsl_chan_activate_lchan(new_lchan, 0x1, 0, 0) < 0) {
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LOGP(DHO, LOGL_ERROR, "could not activate channel\n");
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lchan_free(new_lchan);
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return -1;
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}
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/* remember that we have the channel */
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conn->secondary_lchan = new_lchan;
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new_lchan->conn = conn;
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rsl_lchan_set_state(new_lchan, LCHAN_S_ACT_REQ);
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return 0;
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}
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struct gsm_subscriber_connection *subscr_con_allocate(struct gsm_lchan *lchan)
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{
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struct gsm_subscriber_connection *conn;
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conn = talloc_zero(lchan->ts->trx->bts->network, struct gsm_subscriber_connection);
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if (!conn)
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return NULL;
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/* Configure the time and start it so it will be closed */
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conn->lchan = lchan;
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conn->bts = lchan->ts->trx->bts;
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lchan->conn = conn;
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llist_add_tail(&conn->entry, &sub_connections);
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return conn;
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}
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/* TODO: move subscriber put here... */
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void subscr_con_free(struct gsm_subscriber_connection *conn)
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{
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if (!conn)
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return;
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if (conn->subscr) {
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subscr_put(conn->subscr);
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conn->subscr = NULL;
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}
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if (conn->ho_lchan) {
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LOGP(DNM, LOGL_ERROR, "The ho_lchan should have been cleared.\n");
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conn->ho_lchan->conn = NULL;
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}
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if (conn->lchan) {
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LOGP(DNM, LOGL_ERROR, "The lchan should have been cleared.\n");
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conn->lchan->conn = NULL;
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}
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if (conn->secondary_lchan) {
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LOGP(DNM, LOGL_ERROR, "The secondary_lchan should have been cleared.\n");
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conn->secondary_lchan->conn = NULL;
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}
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llist_del(&conn->entry);
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talloc_free(conn);
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}
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int bsc_api_init(struct gsm_network *network, struct bsc_api *api)
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{
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network->bsc_api = api;
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return 0;
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}
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int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
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struct msgb *msg, int link_id, int allow_sach)
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{
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uint8_t sapi;
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if (!conn->lchan) {
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LOGP(DMSC, LOGL_ERROR,
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"Called submit dtap without an lchan.\n");
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msgb_free(msg);
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return -1;
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}
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sapi = link_id & 0x7;
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msg->lchan = conn->lchan;
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msg->trx = msg->lchan->ts->trx;
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/* If we are on a TCH and need to submit a SMS (on SAPI=3) we need to use the SACH */
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if (allow_sach && sapi != 0) {
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if (conn->lchan->type == GSM_LCHAN_TCH_F || conn->lchan->type == GSM_LCHAN_TCH_H)
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link_id |= 0x40;
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}
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msg->l3h = msg->data;
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if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) {
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OBSC_LINKID_CB(msg) = link_id;
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if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) {
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msgb_free(msg);
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send_sapi_reject(conn, link_id);
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return -1;
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}
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return 0;
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} else {
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return rsl_data_request(msg, link_id);
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}
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}
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/**
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* Send a GSM08.08 Assignment Request. Right now this does not contain the
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* audio codec type or the allowed rates for the config. It is assumed that
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* this is for audio handling and that when we have a TCH it is capable of
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* handling the audio codec. On top of that it is assumed that we are using
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* AMR 5.9 when assigning a TCH/H.
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*/
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int gsm0808_assign_req(struct gsm_subscriber_connection *conn, int chan_mode, int full_rate)
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{
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struct bsc_api *api;
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api = conn->bts->network->bsc_api;
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if (conn->lchan->type == GSM_LCHAN_SDCCH) {
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if (handle_new_assignment(conn, chan_mode, full_rate) != 0)
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goto error;
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} else {
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LOGP(DMSC, LOGL_NOTICE,
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"Sending ChanModify for speech %d %d\n", chan_mode, full_rate);
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if (chan_mode == GSM48_CMODE_SPEECH_AMR) {
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conn->lchan->mr_conf.ver = 1;
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conn->lchan->mr_conf.icmi = 1;
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conn->lchan->mr_conf.m5_90 = 1;
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}
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gsm48_lchan_modify(conn->lchan, chan_mode);
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}
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/* we will now start the timer to complete the assignment */
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conn->T10.cb = assignment_t10_timeout;
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conn->T10.data = conn;
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bsc_schedule_timer(&conn->T10, GSM0808_T10_VALUE);
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return 0;
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error:
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api->assign_fail(conn, 0, NULL);
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return -1;
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}
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int gsm0808_page(struct gsm_bts *bts, unsigned int page_group, unsigned int mi_len,
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uint8_t *mi, int chan_type)
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{
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return rsl_paging_cmd(bts, page_group, mi_len, mi, chan_type);
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}
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static void handle_ass_compl(struct gsm_subscriber_connection *conn,
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struct msgb *msg)
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{
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struct gsm48_hdr *gh;
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struct bsc_api *api = conn->bts->network->bsc_api;
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if (conn->secondary_lchan != msg->lchan) {
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LOGP(DMSC, LOGL_ERROR, "Assignment Compl should occur on second lchan.\n");
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return;
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}
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gh = msgb_l3(msg);
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if (msgb_l3len(msg) - sizeof(*gh) != 1) {
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LOGP(DMSC, LOGL_ERROR, "Assignment Compl invalid: %d\n",
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msgb_l3len(msg) - sizeof(*gh));
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return;
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}
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/* swap channels */
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bsc_del_timer(&conn->T10);
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lchan_release(conn->lchan, 0, 1);
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conn->lchan = conn->secondary_lchan;
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conn->secondary_lchan = NULL;
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if (is_ipaccess_bts(conn->bts) && conn->lchan->tch_mode != GSM48_CMODE_SIGN)
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rsl_ipacc_crcx(conn->lchan);
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api->assign_compl(conn, gh->data[0],
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lchan_to_chosen_channel(conn->lchan),
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conn->lchan->encr.alg_id,
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chan_mode_to_speech(conn->lchan));
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}
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static void handle_ass_fail(struct gsm_subscriber_connection *conn,
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struct msgb *msg)
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{
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struct bsc_api *api = conn->bts->network->bsc_api;
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uint8_t *rr_failure;
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struct gsm48_hdr *gh;
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if (conn->lchan != msg->lchan) {
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LOGP(DMSC, LOGL_ERROR, "Assignment failure should occur on primary lchan.\n");
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return;
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}
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/* stop the timer and release it */
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bsc_del_timer(&conn->T10);
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lchan_release(conn->secondary_lchan, 0, 1);
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conn->secondary_lchan = NULL;
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gh = msgb_l3(msg);
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if (msgb_l3len(msg) - sizeof(*gh) != 1) {
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LOGP(DMSC, LOGL_ERROR, "assignemnt failure unhandled: %d\n",
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msgb_l3len(msg) - sizeof(*gh));
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rr_failure = NULL;
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} else {
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rr_failure = &gh->data[0];
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}
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api->assign_fail(conn,
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GSM0808_CAUSE_RADIO_INTERFACE_MESSAGE_FAILURE,
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rr_failure);
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}
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static void dispatch_dtap(struct gsm_subscriber_connection *conn,
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uint8_t link_id, struct msgb *msg)
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{
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struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api;
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struct gsm48_hdr *gh;
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uint8_t pdisc;
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int rc;
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if (msgb_l3len(msg) < sizeof(*gh)) {
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LOGP(DMSC, LOGL_ERROR, "Message too short for a GSM48 header.\n");
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return;
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}
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gh = msgb_l3(msg);
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pdisc = gh->proto_discr & 0x0f;
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switch (pdisc) {
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case GSM48_PDISC_RR:
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switch (gh->msg_type) {
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case GSM48_MT_RR_CIPH_M_COMPL:
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if (api->cipher_mode_compl)
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return api->cipher_mode_compl(conn, msg,
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conn->lchan->encr.alg_id);
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break;
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case GSM48_MT_RR_ASS_COMPL:
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handle_ass_compl(conn, msg);
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break;
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case GSM48_MT_RR_ASS_FAIL:
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handle_ass_fail(conn, msg);
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break;
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case GSM48_MT_RR_CHAN_MODE_MODIF_ACK:
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bsc_del_timer(&conn->T10);
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rc = gsm48_rx_rr_modif_ack(msg);
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if (rc < 0 && api->assign_fail) {
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api->assign_fail(conn,
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GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE,
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NULL);
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} else if (rc >= 0 && api->assign_compl)
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api->assign_compl(conn, 0,
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lchan_to_chosen_channel(conn->lchan),
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conn->lchan->encr.alg_id,
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chan_mode_to_speech(conn->lchan));
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return;
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break;
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}
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break;
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case GSM48_PDISC_MM:
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break;
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}
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/* default case */
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if (api->dtap)
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api->dtap(conn, link_id, msg);
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}
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int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
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{
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int rc;
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struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api;
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struct gsm_lchan *lchan;
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lchan = msg->lchan;
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if (lchan->state != LCHAN_S_ACTIVE) {
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LOGP(DRSL, LOGL_INFO, "Got data in non active state(%s), "
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"discarding.\n", gsm_lchans_name(lchan->state));
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return -1;
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}
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if (lchan->conn) {
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dispatch_dtap(lchan->conn, link_id, msg);
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} else {
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rc = BSC_API_CONN_POL_REJECT;
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lchan->conn = subscr_con_allocate(msg->lchan);
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if (!lchan->conn) {
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lchan_release(lchan, 0, 0);
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return -1;
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}
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|
|
|
rc = api->compl_l3(lchan->conn, msg, 0);
|
|
|
|
if (rc != BSC_API_CONN_POL_ACCEPT) {
|
|
lchan->conn->lchan = NULL;
|
|
subscr_con_free(lchan->conn);
|
|
lchan_release(lchan, 0, 0);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher,
|
|
const uint8_t *key, int len, int include_imeisv)
|
|
{
|
|
if (cipher > 0 && key == NULL) {
|
|
LOGP(DRSL, LOGL_ERROR, "Need to have an encrytpion key.\n");
|
|
return -1;
|
|
}
|
|
|
|
if (len > MAX_A5_KEY_LEN) {
|
|
LOGP(DRSL, LOGL_ERROR, "The key is too long: %d\n", len);
|
|
return -1;
|
|
}
|
|
|
|
conn->lchan->encr.alg_id = RSL_ENC_ALG_A5(cipher);
|
|
if (key) {
|
|
conn->lchan->encr.key_len = len;
|
|
memcpy(conn->lchan->encr.key, key, len);
|
|
}
|
|
|
|
return gsm48_send_rr_ciph_mode(conn->lchan, include_imeisv);
|
|
}
|
|
|
|
/*
|
|
* Release all occupied RF Channels but stay around for more.
|
|
*/
|
|
int gsm0808_clear(struct gsm_subscriber_connection *conn)
|
|
{
|
|
if (conn->ho_lchan)
|
|
bsc_clear_handover(conn, 1);
|
|
|
|
if (conn->secondary_lchan)
|
|
lchan_release(conn->secondary_lchan, 0, 1);
|
|
|
|
if (conn->lchan)
|
|
lchan_release(conn->lchan, 1, 0);
|
|
|
|
conn->lchan = NULL;
|
|
conn->secondary_lchan = NULL;
|
|
conn->ho_lchan = NULL;
|
|
conn->bts = NULL;
|
|
|
|
bsc_del_timer(&conn->T10);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id)
|
|
{
|
|
struct bsc_api *api;
|
|
|
|
if (!conn)
|
|
return;
|
|
|
|
api = conn->bts->network->bsc_api;
|
|
if (!api || !api->sapi_n_reject)
|
|
return;
|
|
|
|
api->sapi_n_reject(conn, link_id);
|
|
}
|
|
|
|
static void rll_ind_cb(struct gsm_lchan *lchan, uint8_t link_id, void *_data, enum bsc_rllr_ind rllr_ind)
|
|
{
|
|
struct msgb *msg = _data;
|
|
|
|
/*
|
|
* There seems to be a small window that the RLL timer can
|
|
* fire after a lchan_release call and before the S_CHALLOC_FREED
|
|
* is called. Check if a conn is set before proceeding.
|
|
*/
|
|
if (!lchan->conn)
|
|
return;
|
|
|
|
switch (rllr_ind) {
|
|
case BSC_RLLR_IND_EST_CONF:
|
|
rsl_data_request(msg, OBSC_LINKID_CB(msg));
|
|
break;
|
|
case BSC_RLLR_IND_REL_IND:
|
|
case BSC_RLLR_IND_ERR_IND:
|
|
case BSC_RLLR_IND_TIMEOUT:
|
|
send_sapi_reject(lchan->conn, OBSC_LINKID_CB(msg));
|
|
msgb_free(msg);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal,
|
|
void *handler_data, void *signal_data)
|
|
{
|
|
struct bsc_api *bsc;
|
|
struct gsm_lchan *lchan;
|
|
struct lchan_signal_data *lchan_data;
|
|
|
|
if (subsys != SS_LCHAN)
|
|
return 0;
|
|
|
|
|
|
lchan_data = signal_data;
|
|
if (!lchan_data->lchan || !lchan_data->lchan->conn)
|
|
return 0;
|
|
|
|
lchan = lchan_data->lchan;
|
|
bsc = lchan->ts->trx->bts->network->bsc_api;
|
|
if (!bsc)
|
|
return 0;
|
|
|
|
switch (signal) {
|
|
case S_LCHAN_UNEXPECTED_RELEASE:
|
|
handle_release(lchan->conn, bsc, lchan);
|
|
break;
|
|
case S_LCHAN_ACTIVATE_ACK:
|
|
handle_chan_ack(lchan->conn, bsc, lchan);
|
|
break;
|
|
case S_LCHAN_ACTIVATE_NACK:
|
|
handle_chan_nack(lchan->conn, bsc, lchan);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void handle_release(struct gsm_subscriber_connection *conn,
|
|
struct bsc_api *bsc, struct gsm_lchan *lchan)
|
|
{
|
|
int destruct = 1;
|
|
|
|
if (conn->secondary_lchan == lchan) {
|
|
bsc_del_timer(&conn->T10);
|
|
conn->secondary_lchan = NULL;
|
|
|
|
bsc->assign_fail(conn,
|
|
GSM0808_CAUSE_RADIO_INTERFACE_FAILURE,
|
|
NULL);
|
|
}
|
|
|
|
/* clear the connection now */
|
|
if (bsc->clear_request)
|
|
destruct = bsc->clear_request(conn, 0);
|
|
|
|
/* now give up all channels */
|
|
if (conn->lchan == lchan)
|
|
conn->lchan = NULL;
|
|
if (conn->ho_lchan == lchan) {
|
|
bsc_clear_handover(conn, 0);
|
|
conn->ho_lchan = NULL;
|
|
}
|
|
lchan->conn = NULL;
|
|
|
|
gsm0808_clear(conn);
|
|
|
|
if (destruct)
|
|
subscr_con_free(conn);
|
|
}
|
|
|
|
static void handle_chan_ack(struct gsm_subscriber_connection *conn,
|
|
struct bsc_api *api, struct gsm_lchan *lchan)
|
|
{
|
|
if (conn->secondary_lchan != lchan)
|
|
return;
|
|
|
|
LOGP(DMSC, LOGL_NOTICE, "Sending assignment on chan: %p\n", lchan);
|
|
gsm48_send_rr_ass_cmd(conn->lchan, lchan, 0x3);
|
|
}
|
|
|
|
static void handle_chan_nack(struct gsm_subscriber_connection *conn,
|
|
struct bsc_api *api, struct gsm_lchan *lchan)
|
|
{
|
|
if (conn->secondary_lchan != lchan)
|
|
return;
|
|
|
|
LOGP(DMSC, LOGL_ERROR, "Channel activation failed. Waiting for timeout now\n");
|
|
conn->secondary_lchan->conn = NULL;
|
|
conn->secondary_lchan = NULL;
|
|
}
|
|
|
|
static __attribute__((constructor)) void on_dso_load_bsc(void)
|
|
{
|
|
register_signal_handler(SS_LCHAN, bsc_handle_lchan_signal, NULL);
|
|
}
|