1 files changed, 51 insertions, 0 deletions
diff --git a/src/libmsc/msc_lac.c b/src/libmsc/msc_lac.c
new file mode 100644
index 000000000..bf62ee87c
--- /dev/null
+++ b/src/libmsc/msc_lac.c
@@ -0,0 +1,51 @@
+/* (C) 2018 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * 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 <osmocom/msc/msc_lac.h>
+#include <stdint.h>
+
+/* Update list with LAC information for a particular BSC */
+void msc_lac_update_a(struct gsm_network *network, uint16_t lac, struct bsc_context *bsc_context)
+{
+	struct lac_context *lac_context;
+	bool create_lac_context = true;
+
+	/* Try to find the lac_context list entry based on the given LAC,
+	 * if one exist, we do not need to create a new one */
+	llist_for_each_entry(lac_context, &network->lac_contexts, list) {
+		if (lac_context->lac == lac) {
+			create_lac_context = false;
+			break;
+		}
+	}
+
+	/* We failed to find an existing LAC context, so we create a new one */
+	if (create_lac_context) {
+		lac_context = talloc_zero(network, struct lac_context);
+		lac_context->lac = lac;
+		llist_add_tail(&lac_context->list, &network->lac_contexts);
+	}
+
+	/* Update context info */
+	lac_context->bsc_context = bsc_context;
+	lac_context->ran_type = RAN_GERAN_A;
+
+	/* TODO: Add some statistical information like timestamps, when created? when last seen? */
+}