add BSSMAP coding for Location Services

BSSMAP: add A-interface messages between MSC and BSC:
- Perform Location Request
- Perform Location Response
- Perform Location Abort

Change-Id: I4d7302a4853518916b6b425e710c10568eb2ffe5

1 files changed, 52 insertions, 0 deletions

diff --git a/include/osmocom/gsm/gsm0808_lcs.h b/include/osmocom/gsm/gsm0808_lcs.h
new file mode 100644
index 00000000..8fcbe380
--- /dev/null
+++ b/include/osmocom/gsm/gsm0808_lcs.h
@@ -0,0 +1,52 @@
+/*! \addtogroup gsm0808
+ *  @{
+ *  \file gsm0808_lcs.h
+ *
+ * Declarations that depend on both gsm0808.h and bssmap_le.h: LCS related message coding.
+ * (This file prevents circular dependency between struct definitions for BSSMAP messages, since BSSMAP references
+ * struct lcs_cause and struct bssmap_le_location_type, and BSSMAP-LE references gsm0808_cause.
+ */
+/*
+ * (C) 2020 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#pragma once
+
+#include <osmocom/gsm/gsm0808.h>
+#include <osmocom/gsm/bssmap_le.h>
+
+struct gsm0808_perform_location_request {
+	struct bssmap_le_location_type location_type;
+	struct osmo_mobile_identity imsi;
+
+	bool more_items; /*!< always set this to false */
+};
+struct msgb *gsm0808_create_perform_location_request(const struct gsm0808_perform_location_request *params);
+
+struct gsm0808_perform_location_response {
+	bool location_estimate_present;
+	union gad_raw location_estimate;
+
+	struct lcs_cause_ie lcs_cause;
+};
+struct msgb *gsm0808_create_perform_location_response(const struct gsm0808_perform_location_response *params);
+
+int gsm0808_enc_lcs_cause(struct msgb *msg, const struct lcs_cause_ie *lcs_cause);
+struct msgb *gsm0808_create_perform_location_abort(const struct lcs_cause_ie *lcs_cause);
+
+/*! @} */