149 lines
4.1 KiB
C
149 lines
4.1 KiB
C
/*
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* (C) 2010-2013 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010-2013 by On-Waves
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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 <osmocom/bsc/osmo_bsc_grace.h>
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#include <osmocom/bsc/osmo_bsc_rf.h>
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#include <osmocom/bsc/bsc_msc_data.h>
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#include <osmocom/bsc/gsm_04_80.h>
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#include <osmocom/bsc/bsc_subscriber.h>
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#include <osmocom/bsc/paging.h>
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#include <osmocom/bsc/signal.h>
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int bsc_grace_allow_new_connection(struct gsm_network *network, struct gsm_bts *bts)
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{
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if (bts->excl_from_rf_lock)
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return 1;
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return network->bsc_data->rf_ctrl->policy == S_RF_ON;
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}
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/* Return value is like paging_request_bts():
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* returns 1 on success (one BTS was paged); 0 in case of error (e.g. TRX down) */
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static int locked_paging_bts(struct gsm_bts *bts,
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struct bsc_subscr *subscr,
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int chan_needed,
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struct bsc_msc_data *msc)
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{
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/* Return error if the BTS is not excluded from the lock. */
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if (!bts->excl_from_rf_lock)
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return 0;
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/* in case of no lac patching is in place, check the BTS */
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if (msc->core_lac == -1 && subscr->lac != bts->location_area_code)
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return 0;
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return paging_request_bts(bts, subscr, chan_needed, msc);
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}
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/**
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* Page a subscriber in an MSC.
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* \param[in] rf_policy if not S_RF_ON, page only BTSs which are not excluded from the RF lock
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* \param[in] subscr subscriber we want to page
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* \param[in] chan_needed value of the GSM0808_IE_CHANNEL_NEEDED IE
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* \param[in] msc MSC which has issued this paging
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* \param[in] bts The BTS to issue the paging on
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* \returns 1 if paging was issued to the BTS, 0 if not
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*/
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int bsc_grace_paging_request(enum signal_rf rf_policy,
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struct bsc_subscr *subscr,
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int chan_needed,
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struct bsc_msc_data *msc,
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struct gsm_bts *bts)
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{
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if (rf_policy == S_RF_ON)
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return paging_request_bts(bts, subscr, chan_needed, msc);
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return locked_paging_bts(bts, subscr, chan_needed, msc);
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}
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static int handle_sub(struct gsm_lchan *lchan, const char *text)
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{
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struct gsm_subscriber_connection *conn;
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/* only send it to TCH */
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if (lchan->type != GSM_LCHAN_TCH_H && lchan->type != GSM_LCHAN_TCH_F)
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return -1;
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/* only send on the primary channel */
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conn = lchan->conn;
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if (!conn)
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return -1;
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if (conn->lchan != lchan)
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return -1;
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/* only when active */
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if (lchan->state != LCHAN_S_ACTIVE)
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return -1;
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bsc_send_ussd_notify(conn, 0, text);
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bsc_send_ussd_release_complete(conn);
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return 0;
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}
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/*
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* The place to handle the grace mode. Right now we will send
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* USSD messages to the subscriber, in the future we might start
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* a timer to have different modes for the grace period.
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*/
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static int handle_grace(struct gsm_network *network)
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{
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int ts_nr, lchan_nr;
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struct gsm_bts *bts;
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struct gsm_bts_trx *trx;
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if (!network->bsc_data->mid_call_txt)
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return 0;
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llist_for_each_entry(bts, &network->bts_list, list) {
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llist_for_each_entry(trx, &bts->trx_list, list) {
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for (ts_nr = 0; ts_nr < TRX_NR_TS; ++ts_nr) {
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struct gsm_bts_trx_ts *ts = &trx->ts[ts_nr];
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for (lchan_nr = 0; lchan_nr < TS_MAX_LCHAN; ++lchan_nr) {
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handle_sub(&ts->lchan[lchan_nr],
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network->bsc_data->mid_call_txt);
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}
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}
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}
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}
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return 0;
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}
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static int handle_rf_signal(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data)
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{
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struct rf_signal_data *sig;
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if (subsys != SS_RF)
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return -1;
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sig = signal_data;
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if (signal == S_RF_GRACE)
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handle_grace(sig->net);
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return 0;
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}
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static __attribute__((constructor)) void on_dso_load_grace(void)
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{
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osmo_signal_register_handler(SS_RF, handle_rf_signal, NULL);
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}
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