105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/* main MSC management code... */
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/*
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* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by On-Waves
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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/debug.h>
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#include <openbsc/transaction.h>
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#include <openbsc/gsm_04_11.h>
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static void msc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci)
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{
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int sapi = dlci & 0x7;
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if (sapi == UM_SAPI_SMS)
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gsm411_sapi_n_reject(conn);
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}
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static int msc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause)
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{
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gsm0408_clear_request(conn, cause);
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if (conn->put_channel) {
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conn->put_channel = 0;
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subscr_put_channel(conn->subscr);
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}
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return 1;
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}
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static int msc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg,
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uint16_t chosen_channel)
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{
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gsm0408_new_conn(conn);
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gsm0408_dispatch(conn, msg);
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/* TODO: do better */
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return BSC_API_CONN_POL_ACCEPT;
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}
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static void msc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id, struct msgb *msg)
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{
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gsm0408_dispatch(conn, msg);
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}
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static struct bsc_api msc_handler = {
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.sapi_n_reject = msc_sapi_n_reject,
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.clear_request = msc_clear_request,
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.compl_l3 = msc_compl_l3,
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.dtap = msc_dtap,
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};
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struct bsc_api *msc_bsc_api() {
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return &msc_handler;
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}
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/* lchan release handling */
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void msc_release_connection(struct gsm_subscriber_connection *conn)
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{
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struct gsm_trans *trans;
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/* skip when we are in release, e.g. due an error */
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if (conn->in_release)
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return;
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/* skip releasing of silent calls as they have no transaction */
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if (conn->silent_call)
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return;
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/* check if there is a pending operation */
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if (conn->loc_operation || conn->sec_operation || conn->anch_operation)
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return;
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llist_for_each_entry(trans, &conn->bts->network->trans_list, entry) {
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if (trans->conn == conn)
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return;
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}
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/* no more connections, asking to release the channel */
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conn->in_release = 1;
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gsm0808_clear(conn);
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if (conn->put_channel) {
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conn->put_channel = 0;
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subscr_put_channel(conn->subscr);
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}
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subscr_con_free(conn);
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}
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