git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4234 818b1a75-f10b-46b9-bf7c-635c3b92a50f

2013-10-21 08:08:15 +00:00
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+/*******************************************************************************
+
+  Eurecom OpenAirInterface
+  Copyright(c) 1999 - 2012 Eurecom
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope 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 St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Contact Information
+  Openair Admin: openair_admin@eurecom.fr
+  Openair Tech : openair_tech@eurecom.fr
+  Forums       : http://forums.eurecom.fr/openairinterface
+  Address      : EURECOM, Campus SophiaTech, 450 Route des Chappes
+                 06410 Biot FRANCE
+
+*******************************************************************************/
+
+/*! \file s1ap_eNB_overload.c
+ * \brief s1ap procedures for overload messages within eNB
+ * \author Sebastien ROUX <sebastien.roux@eurecom.fr>
+ * \date 2012
+ * \version 0.1
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "s1ap_common.h"
+#include "s1ap_ies_defs.h"
+#include "s1ap_eNB_defs.h"
+
+#include "s1ap_eNB.h"
+#include "s1ap_eNB_ue_context.h"
+#include "s1ap_eNB_encoder.h"
+#include "s1ap_eNB_overload.h"
+
+#include "sctp_primitives_client.h"
+
+#include "assertions.h"
+
+int s1ap_eNB_handle_overload_start(eNB_mme_desc_t *eNB_desc_p,
+                                   sctp_queue_item_t *packet_p,
+                                   struct s1ap_message_s *message_p)
+{
+    OverloadStartIEs_t  *overload_start_p;
+    s1ap_eNB_mme_data_t *mme_desc_p;
+
+    overload_start_p = &message_p->msg.overloadStartIEs;
+
+    DevCheck(overload_start_p->overloadResponse.present ==
+             OverloadResponse_PR_overloadAction,
+             OverloadResponse_PR_overloadAction, 0, 0);
+
+    /* Non UE-associated signalling -> stream 0 */
+    DevCheck(packet_p->local_stream == 0, packet_p->local_stream,
+             packet_p->remote_port, packet_p->assoc_id);
+
+    if ((mme_desc_p = s1ap_eNB_get_MME(eNB_desc_p, packet_p->assoc_id)) == NULL) {
+        /* No MME context associated */
+        return -1;
+    }
+
+    /* Mark the MME as overloaded and set the overload state according to
+     * the value received.
+     */
+    mme_desc_p->state = S1AP_ENB_OVERLOAD;
+    mme_desc_p->overload_state =
+        overload_start_p->overloadResponse.choice.overloadAction;
+
+    return 0;
+}
+
+int s1ap_eNB_handle_overload_stop(eNB_mme_desc_t *eNB_desc_p,
+                                  sctp_queue_item_t *packet_p,
+                                  struct s1ap_message_s *message_p)
+{
+    /* We received Overload stop message, meaning that the MME is no more
+     * overloaded. This is an empty message, with only message header and no
+     * Information Element.
+     */
+    s1ap_eNB_mme_data_t *mme_desc_p;
+
+    /* Non UE-associated signalling -> stream 0 */
+    DevCheck(packet_p->local_stream == 0, packet_p->local_stream,
+             packet_p->remote_port, packet_p->assoc_id);
+
+    if ((mme_desc_p = s1ap_eNB_get_MME(eNB_desc_p, packet_p->assoc_id)) == NULL) {
+        /* No MME context associated */
+        return -1;
+    }
+
+    mme_desc_p->state = S1AP_ENB_STATE_CONNECTED;
+    mme_desc_p->overload_state = S1AP_NO_OVERLOAD;
+    return 0;
+}