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, 174 insertions, 0 deletions

diff --git a/openbsc/src/osmo-bsc/osmo_bsc_api.c b/openbsc/src/osmo-bsc/osmo_bsc_api.c
new file mode 100644
index 000000000..b8cbcf2f3
--- /dev/null
+++ b/openbsc/src/osmo-bsc/osmo_bsc_api.c
@@ -0,0 +1,174 @@
+/* (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2009-2010 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/osmo_bsc.h>
+#include <openbsc/osmo_msc_data.h>
+#include <openbsc/debug.h>
+
+#include <osmocore/protocol/gsm_08_08.h>
+#include <osmocore/gsm0808.h>
+
+#define return_when_not_connected(conn) \
+	if (!conn->sccp_con) {\
+		LOGP(DMSC, LOGL_ERROR, "MSC Connection not present.\n"); \
+		return; \
+	}
+
+#define return_when_not_connected_val(conn, ret) \
+	if (!conn->sccp_con) {\
+		LOGP(DMSC, LOGL_ERROR, "MSC Connection not present.\n"); \
+		return ret; \
+	}
+
+#define queue_msg_or_return(resp) \
+	if (!resp) { \
+		LOGP(DMSC, LOGL_ERROR, "Failed to allocate response.\n"); \
+		return; \
+	} \
+	bsc_queue_for_msc(conn->sccp_con, resp);
+
+static uint16_t get_network_code_for_msc(struct gsm_network *net)
+{
+	if (net->msc_data->core_ncc != -1)
+		return net->msc_data->core_ncc;
+	return net->network_code;
+}
+
+static uint16_t get_country_code_for_msc(struct gsm_network *net)
+{
+	if (net->msc_data->core_mcc != -1)
+		return net->msc_data->core_mcc;
+	return net->country_code;
+}
+
+static void bsc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci)
+{
+	struct msgb *resp;
+	return_when_not_connected(conn);
+
+	resp = gsm0808_create_sapi_reject(dlci);
+	queue_msg_or_return(resp);
+}
+
+static void bsc_cipher_mode_compl(struct gsm_subscriber_connection *conn,
+				  struct msgb *msg, uint8_t chosen_encr)
+{
+	struct msgb *resp;
+	return_when_not_connected(conn);
+
+	LOGP(DMSC, LOGL_DEBUG, "CIPHER MODE COMPLETE from MS, forwarding to MSC\n");
+	resp = gsm0808_create_cipher_complete(msg, chosen_encr);
+	queue_msg_or_return(resp);
+}
+
+/*
+ * Instruct to reserve data for a new connectiom, create the complete
+ * layer three message, send it to open the connection.
+ */
+static int bsc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg,
+			uint16_t chosen_channel)
+{
+	struct msgb *resp;
+	uint16_t network_code = get_network_code_for_msc(conn->bts->network);
+	uint16_t country_code = get_country_code_for_msc(conn->bts->network);
+
+	/* allocate resource for a new connection */
+	if (bsc_create_new_connection(conn) != 0)
+		return BSC_API_CONN_POL_REJECT;
+
+	bsc_scan_bts_msg(conn, msg);
+	resp = gsm0808_create_layer3(msg, network_code, country_code,
+				     conn->bts->location_area_code,
+				     conn->bts->cell_identity);
+	if (!resp) {
+		LOGP(DMSC, LOGL_DEBUG, "Failed to create layer3 message.\n");
+		bsc_delete_connection(conn->sccp_con);
+		return BSC_API_CONN_POL_REJECT;
+	}
+
+	if (bsc_open_connection(conn->sccp_con, resp) != 0) {
+		bsc_delete_connection(conn->sccp_con);
+		msgb_free(resp);
+		return BSC_API_CONN_POL_REJECT;
+	}
+
+	return BSC_API_CONN_POL_ACCEPT;
+}
+
+static void bsc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id, struct msgb *msg)
+{
+	struct msgb *resp;
+	return_when_not_connected(conn);
+
+	bsc_scan_bts_msg(conn, msg);
+	resp = gsm0808_create_dtap(msg, link_id);
+	queue_msg_or_return(resp);
+}
+
+static void bsc_assign_compl(struct gsm_subscriber_connection *conn, uint8_t rr_cause,
+			     uint8_t chosen_channel, uint8_t encr_alg_id,
+			     uint8_t speech_model)
+{
+	struct msgb *resp;
+	return_when_not_connected(conn);
+
+	resp = gsm0808_create_assignment_completed(rr_cause, chosen_channel,
+						   encr_alg_id, speech_model);
+	queue_msg_or_return(resp);
+}
+
+static void bsc_assign_fail(struct gsm_subscriber_connection *conn,
+			    uint8_t cause, uint8_t *rr_cause)
+{
+	struct msgb *resp;
+	return_when_not_connected(conn);
+
+	resp = gsm0808_create_assignment_failure(cause, rr_cause);
+	queue_msg_or_return(resp);
+}
+
+static int bsc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause)
+{
+	struct msgb *resp;
+	return_when_not_connected_val(conn, 1);
+
+	resp = gsm0808_create_clear_rqst(GSM0808_CAUSE_RADIO_INTERFACE_FAILURE);
+	if (!resp) {
+		LOGP(DMSC, LOGL_ERROR, "Failed to allocate response.\n");
+		return 0;
+	}
+
+	bsc_queue_for_msc(conn->sccp_con, resp);
+	return 0;
+}
+
+static struct bsc_api bsc_handler = {
+	.sapi_n_reject = bsc_sapi_n_reject,
+	.cipher_mode_compl = bsc_cipher_mode_compl,
+	.compl_l3 = bsc_compl_l3,
+	.dtap  = bsc_dtap,
+	.assign_compl = bsc_assign_compl,
+	.assign_fail = bsc_assign_fail,
+	.clear_request = bsc_clear_request,
+};
+
+struct bsc_api *osmo_bsc_api()
+{
+	return &bsc_handler;
+}