115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*! \file s1ap_eNB_overload.c
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* \brief s1ap procedures for overload messages within eNB
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* \author Sebastien ROUX <sebastien.roux@eurecom.fr>
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* \date 2012
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* \version 0.1
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "intertask_interface.h"
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#include "s1ap_common.h"
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#include "s1ap_eNB_defs.h"
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#include "s1ap_eNB.h"
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#include "s1ap_eNB_ue_context.h"
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#include "s1ap_eNB_encoder.h"
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#include "s1ap_eNB_overload.h"
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#include "s1ap_eNB_management_procedures.h"
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#include "assertions.h"
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int s1ap_eNB_handle_overload_start(sctp_assoc_t assoc_id, uint32_t stream, S1AP_S1AP_PDU_t *pdu)
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{
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s1ap_eNB_mme_data_t *mme_desc_p;
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S1AP_OverloadStart_t *container;
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S1AP_OverloadStartIEs_t *ie;
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DevAssert(pdu != NULL);
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container = &pdu->choice.initiatingMessage.value.choice.OverloadStart;
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S1AP_FIND_PROTOCOLIE_BY_ID(S1AP_OverloadStartIEs_t, ie, container,
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S1AP_ProtocolIE_ID_id_OverloadResponse, true);
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if (ie != NULL) {
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DevCheck(ie->value.choice.OverloadResponse.present ==
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S1AP_OverloadResponse_PR_overloadAction,
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S1AP_OverloadResponse_PR_overloadAction, 0, 0);
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}
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else
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{
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return -1;
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}
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/* Non UE-associated signalling -> stream 0 */
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if (stream != 0) {
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S1AP_ERROR("[SCTP %u] Received s1 overload start on stream != 0 (%u)\n",
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assoc_id, stream);
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return -1;
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}
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if ((mme_desc_p = s1ap_eNB_get_MME(NULL, assoc_id, 0)) == NULL) {
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/* No MME context associated */
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return -1;
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}
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/* Mark the MME as overloaded and set the overload state according to
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* the value received.
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*/
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mme_desc_p->state = S1AP_ENB_OVERLOAD;
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mme_desc_p->overload_state =
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ie->value.choice.OverloadResponse.choice.overloadAction;
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return 0;
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}
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int s1ap_eNB_handle_overload_stop(sctp_assoc_t assoc_id, uint32_t stream, S1AP_S1AP_PDU_t *pdu)
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{
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/* We received Overload stop message, meaning that the MME is no more
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* overloaded. This is an empty message, with only message header and no
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* Information Element.
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*/
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DevAssert(pdu != NULL);
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s1ap_eNB_mme_data_t *mme_desc_p;
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/* Non UE-associated signalling -> stream 0 */
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if (stream != 0) {
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S1AP_ERROR("[SCTP %u] Received s1 overload stop on stream != 0 (%u)\n",
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assoc_id, stream);
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return -1;
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}
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if ((mme_desc_p = s1ap_eNB_get_MME(NULL, assoc_id, 0)) == NULL) {
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/* No MME context associated */
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return -1;
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}
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mme_desc_p->state = S1AP_ENB_STATE_CONNECTED;
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mme_desc_p->overload_state = S1AP_NO_OVERLOAD;
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return 0;
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}
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