src/mme-app/msgHandlers/gtpMsgHandler.cpp

/*
 * Copyright (c) 2019, Infosys Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <msgHandlers/gtpMsgHandler.h>

#include <contextManager/subsDataGroupManager.h>
#include <event.h>
#include <ipcTypes.h>
#include <log.h>

using namespace SM;
using namespace mme;

GtpMsgHandler::~GtpMsgHandler() {

}

GtpMsgHandler::GtpMsgHandler() {


}

GtpMsgHandler* GtpMsgHandler::Instance()
{
	static GtpMsgHandler msgHandler;
	return &msgHandler;
}

void GtpMsgHandler::handleGtpMessage_v(cmn::utils::MsgBuffer* msgBuf)
{
	if (msgBuf == NULL)
		return;

	const gtp_incoming_msg_data_t* msgData_p = (gtp_incoming_msg_data_t*)(msgBuf->getDataPointer());

	switch (msgData_p->msg_type)
	{
		case msg_type_t::create_session_response:
			log_msg(LOG_DEBUG,"Create Session Response msg rxed\n");
			handleCreateSessionResponseMsg_v(msgBuf, msgData_p->ue_idx);
			break;

		case msg_type_t::modify_bearer_response:
			handleModifyBearerResponseMsg_v(msgBuf, msgData_p->ue_idx);
			break;

		case msg_type_t::delete_session_response:
			handleDeleteSessionResponseMsg_v(msgBuf, msgData_p->ue_idx);
			break;
			
		case msg_type_t::release_bearer_response:
			handleReleaseBearerResponseMsg_v(msgBuf, msgData_p->ue_idx);
			break;
		
		case msg_type_t::downlink_data_notification:
			handleDdnMsg_v(msgBuf, msgData_p->ue_idx);
			break;

		default:
			log_msg(LOG_INFO, "Unhandled Gtp Message %d \n", msgData_p->msg_type);
			delete msgBuf;
	}

}

void GtpMsgHandler::handleCreateSessionResponseMsg_v(const cmn::utils::MsgBuffer* msgData_p, uint32_t ueIdx)
{
	log_msg(LOG_INFO, "handleCreateSessionResponseMsg_v");

	SM::ControlBlock* controlBlk_p = SubsDataGroupManager::Instance()->findControlBlock(ueIdx);
	if(controlBlk_p == NULL)
	{
		log_msg(LOG_ERROR, "handleCreateSessionResponseMsg_v: "
							"Failed to find UE context using idx %d\n",
							ueIdx);
		return;
	}

	// Fire CS resp from SGW event, insert cb to procedure queue
	SM::Event evt(Event_e::CS_RESP_FROM_SGW, (void *)msgData_p);
	controlBlk_p->addEventToProcQ(evt);
}

void GtpMsgHandler::handleModifyBearerResponseMsg_v(const cmn::utils::MsgBuffer* msgData_p, uint32_t ueIdx)
{
	log_msg(LOG_INFO, "handleModifyBearerResponseMsg_v");

	SM::ControlBlock* controlBlk_p = SubsDataGroupManager::Instance()->findControlBlock(ueIdx);
	if(controlBlk_p == NULL)
	{
		log_msg(LOG_ERROR, "handleModifyBearerResponseMsg_v: "
							"Failed to find UE context using idx %d\n",
							ueIdx);
		return;
	}

	// Fire MB rep from SGW event, insert cb to procedure queue
	SM::Event evt(Event_e::MB_RESP_FROM_SGW, (void *)msgData_p);
	controlBlk_p->addEventToProcQ(evt);
}

void GtpMsgHandler::handleDeleteSessionResponseMsg_v(const cmn::utils::MsgBuffer* msgData_p, uint32_t ueIdx)
{
	log_msg(LOG_INFO, "handleDeleteSessionResponseMsg_v");
	
	SM::ControlBlock* controlBlk_p = SubsDataGroupManager::Instance()->findControlBlock(ueIdx);
	if(controlBlk_p == NULL)
	{
		log_msg(LOG_ERROR, "handleDeleteSessionResponse_v: "
							"Failed to find UE context using idx %d\n",
							ueIdx);
		return;
	}

	SM::Event evt(Event_e::DEL_SESSION_RESP_FROM_SGW, (void *)msgData_p);
	controlBlk_p->addEventToProcQ(evt);
}

void GtpMsgHandler::handleReleaseBearerResponseMsg_v(const cmn::utils::MsgBuffer* msgData_p, uint32_t ueIdx)
{
	log_msg(LOG_INFO, "handleReleaseBearerResponseMsg_v");

	SM::ControlBlock* controlBlk_p = SubsDataGroupManager::Instance()->findControlBlock(ueIdx);
	if(controlBlk_p == NULL)
	{
		log_msg(LOG_ERROR, "handleReleaseBearerResponse_v: "
							"Failed to find UE context using idx %d\n",
							ueIdx);
		return;
	}
	
	// Fire rel bearer response from sgw event, insert cb to procedure queue
	SM::Event evt(Event_e::REL_AB_RESP_FROM_SGW, (void *)msgData_p);
	controlBlk_p->addEventToProcQ(evt);
}

void GtpMsgHandler::handleDdnMsg_v(const cmn::utils::MsgBuffer* msgData_p, uint32_t ueIdx)
{
	log_msg(LOG_INFO,"Inside handle DDN\n");

	SM::ControlBlock* controlBlk_p = SubsDataGroupManager::Instance()->findControlBlock(ueIdx);
	if(controlBlk_p == NULL)
	{
		log_msg(LOG_ERROR, "handleReleaseBearerResponse_v: "
							"Failed to find UE context using idx %d\n",
							ueIdx);
		return;
	}

	// Fire ddn from sgw event, insert cb to procedure queue
	SM::Event evt(Event_e::DDN_FROM_SGW, (void *)msgData_p);
	controlBlk_p->addEventToProcQ(evt);
}