1 files changed, 110 insertions, 0 deletions
diff --git a/openbsc/src/osmo-cscn/iucs_ranap.c b/openbsc/src/osmo-cscn/iucs_ranap.c
new file mode 100644
index 000000000..078783f12
--- /dev/null
+++ b/openbsc/src/osmo-cscn/iucs_ranap.c
@@ -0,0 +1,110 @@
+/* Implementation of RANAP messages to/from an MSC via an Iu-CS interface.
+ * This keeps direct RANAP dependencies out of libmsc. */
+
+/* (C) 2016 by sysmocom s.m.f.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 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/core/logging.h>
+
+#include <osmocom/ranap/ranap_ies_defs.h>
+
+#include <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/gsm_subscriber.h>
+#include <openbsc/iu.h>
+#include <openbsc/iu_cs.h>
+
+#include "iucs_ranap.h"
+
+/* To continue authorization after a Security Mode Complete */
+int gsm0408_authorize(struct gsm_subscriber_connection *conn);
+
+static int iucs_rx_rab_assign(struct gsm_subscriber_connection *conn,
+			      RANAP_RAB_SetupOrModifiedItemIEs_t *setup_ies)
+{
+	uint8_t rab_id;
+	RANAP_RAB_SetupOrModifiedItem_t *item = &setup_ies->raB_SetupOrModifiedItem;
+
+	rab_id = item->rAB_ID.buf[0];
+
+	LOGP(DIUCS, LOGL_NOTICE, "Received RAB assignment event for %s"
+	     " rab_id=%hhd\n", subscr_name(conn->subscr), rab_id);
+	/* TODO do stuff like in sgsn_ranap_rab_ass_resp() */
+
+	return 0;
+}
+
+int iucs_rx_sec_mode_compl(struct gsm_subscriber_connection *conn,
+			   RANAP_SecurityModeCompleteIEs_t *ies)
+{
+	gsm_cbfn *cb;
+
+	OSMO_ASSERT(conn->via_iface == IFACE_IU);
+
+	/* TODO evalute ies */
+
+	if (conn->iu.integrity_protection)
+		LOGP(DIUCS, LOGL_NOTICE, "Integrity Protection"
+		     " was already enabled for %s\n",
+		     subscr_name(conn->subscr));
+
+	conn->iu.integrity_protection = INTEGRITY_PROTECTION_IK;
+
+	cb = conn->sec_operation->cb;
+	if (!cb)
+		return 0;
+	return cb(GSM_HOOK_RR_SECURITY, GSM_SECURITY_SUCCEEDED,
+		  NULL, conn, conn->sec_operation->cb_data);
+}
+
+int iucs_rx_ranap_event(struct gsm_network *network,
+			struct ue_conn_ctx *ue_ctx, int type, void *data)
+{
+	struct gsm_subscriber_connection *conn;
+
+	conn = subscr_conn_lookup_iu(network, ue_ctx);
+
+	if (!conn) {
+		LOGP(DRANAP, LOGL_NOTICE, "Cannot find subscriber for IU event %u\n", type);
+		return -1;
+	}
+
+	switch (type) {
+	case IU_EVENT_IU_RELEASE:
+		LOGP(DIUCS, LOGL_INFO, "IuCS release for %s\n",
+		     subscr_name(conn->subscr));
+		msc_subscr_con_free(conn);
+		return 0;
+
+	case IU_EVENT_SECURITY_MODE_COMPLETE:
+		LOGP(DIUCS, LOGL_INFO, "IuCS security mode complete for %s\n",
+		     subscr_name(conn->subscr));
+		return iucs_rx_sec_mode_compl(conn,
+					      (RANAP_SecurityModeCompleteIEs_t*)data);
+	case IU_EVENT_RAB_ASSIGN:
+		return iucs_rx_rab_assign(conn,
+				(RANAP_RAB_SetupOrModifiedItemIEs_t*)data);
+	default:
+		LOGP(DIUCS, LOGL_NOTICE, "Unknown message received:"
+		     " RANAP event: %i\n", type);
+		return -1;
+	}
+}
+