re-structure the OpenBSC directory layout

The new structure divides the code into a number of libraries
for the BSC core functionality, MSC core functionality, Abis transport,
TRAU and other bits.

This doesn't introduce any functional code change but simply moves
around files and alters Makefile.am accordingly.

Next step would be to disentangle a lot of the inter-library
dependencies and make the individual bits of code more independent.

1 files changed, 104 insertions, 0 deletions

diff --git a/openbsc/src/msc/osmo_msc.c b/openbsc/src/msc/osmo_msc.c
new file mode 100644
index 000000000..8c86dcc8e
--- /dev/null
+++ b/openbsc/src/msc/osmo_msc.c
@@ -0,0 +1,104 @@
+/* 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);
+}