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-rw-r--r--src/libmsc/osmo_msc.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/src/libmsc/osmo_msc.c b/src/libmsc/osmo_msc.c
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+++ b/src/libmsc/osmo_msc.c
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+/* main MSC management code... */
+
+/*
+ * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2010 by On-Waves
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <openbsc/bsc_api.h>
+#include <openbsc/debug.h>
+#include <openbsc/transaction.h>
+
+#include <openbsc/gsm_04_11.h>
+
+static void msc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci)
+{
+ int sapi = dlci & 0x7;
+
+ if (sapi == UM_SAPI_SMS)
+ gsm411_sapi_n_reject(conn);
+}
+
+static int msc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause)
+{
+ gsm0408_clear_request(conn, cause);
+ if (conn->put_channel) {
+ conn->put_channel = 0;
+ subscr_put_channel(conn->subscr);
+ }
+ return 1;
+}
+
+static int msc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg,
+ uint16_t chosen_channel)
+{
+ gsm0408_new_conn(conn);
+ gsm0408_dispatch(conn, msg);
+
+ /* TODO: do better */
+ return BSC_API_CONN_POL_ACCEPT;
+}
+
+static void msc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id, struct msgb *msg)
+{
+ gsm0408_dispatch(conn, msg);
+}
+
+static struct bsc_api msc_handler = {
+ .sapi_n_reject = msc_sapi_n_reject,
+ .clear_request = msc_clear_request,
+ .compl_l3 = msc_compl_l3,
+ .dtap = msc_dtap,
+};
+
+struct bsc_api *msc_bsc_api() {
+ return &msc_handler;
+}
+
+/* lchan release handling */
+void msc_release_connection(struct gsm_subscriber_connection *conn)
+{
+ struct gsm_trans *trans;
+
+ /* skip when we are in release, e.g. due an error */
+ if (conn->in_release)
+ return;
+
+ /* skip releasing of silent calls as they have no transaction */
+ if (conn->silent_call)
+ return;
+
+ /* check if there is a pending operation */
+ if (conn->loc_operation || conn->sec_operation || conn->anch_operation)
+ return;
+
+ llist_for_each_entry(trans, &conn->bts->network->trans_list, entry) {
+ if (trans->conn == conn)
+ return;
+ }
+
+ /* no more connections, asking to release the channel */
+ conn->in_release = 1;
+ gsm0808_clear(conn);
+ if (conn->put_channel) {
+ conn->put_channel = 0;
+ subscr_put_channel(conn->subscr);
+ }
+ subscr_con_free(conn);
+}