src/mme-app/actionHandlers/serviceRequestActionHandlers.cpp

/*
 * Copyright 2019-present Infosys Limited
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/******************************************************************************
 *
 * This file has both generated and manual code.
 *
 * File template used for code generation:
 * <TOP-DIR/scripts/SMCodeGen/templates/stateMachineTmpls/actionHandlers.cpp.tt>
 *
 ******************************************************************************/

#include <typeinfo>
#include "actionHandlers/actionHandlers.h"
#include "controlBlock.h"
#include "msgType.h"
#include "contextManager/subsDataGroupManager.h"
#include "contextManager/dataBlocks.h"
#include "procedureStats.h"
#include "log.h"
#include "secUtils.h"
#include "state.h"
#include <string.h>
#include <sstream>
#include <smTypes.h>
#include "common_proc_info.h"
#include <ipcTypes.h>
#include <tipcTypes.h>
#include <msgBuffer.h>
#include <interfaces/mmeIpcInterface.h>
#include <event.h>
#include <stateMachineEngine.h>
#include <utils/mmeContextManagerUtils.h>

using namespace mme;
using namespace SM;
using namespace cmn::utils;

extern MmeIpcInterface* mmeIpcIf_g;

/***************************************
* Action handler :send_paging_req_to_ue 
***************************************/
ActStatus ActionHandlers::send_paging_req_to_ue(ControlBlock& cb)
{	
	log_msg(LOG_INFO,"Inside send_paging_req\n");

	UEContext *ue_ctxt = dynamic_cast<UEContext*>(cb.getPermDataBlock());
	
	if (ue_ctxt == NULL)
	{
		log_msg(LOG_DEBUG, "send_paging_req: ue context is NULL\n");
		return ActStatus::HALT;
	}
	
	struct paging_req_Q_msg pag_req;
	pag_req.msg_type = paging_request;
	pag_req.ue_idx = ue_ctxt->getContextID();
	pag_req.enb_s1ap_ue_id = ue_ctxt->getS1apEnbUeId();
	pag_req.enb_fd = ue_ctxt->getEnbFd();
	pag_req.cn_domain = CN_DOMAIN_PS;

	const DigitRegister15& ueImsi = ue_ctxt->getImsi();
	ueImsi.convertToBcdArray( pag_req.IMSI );
	memcpy(&pag_req.tai, &(ue_ctxt->getTai().tai_m), sizeof(struct TAI));

	cmn::ipc::IpcAddress destAddr;
	destAddr.u32 = TipcServiceInstance::s1apAppInstanceNum_c;
	mmeIpcIf_g->dispatchIpcMsg((char *) &pag_req, sizeof(pag_req), destAddr);

	ProcedureStats::num_of_ddn_received++;

	log_msg(LOG_INFO,"Leaving send_paging_req\n");

	return ActStatus::PROCEED;
}

/***************************************
* Action handler : process_service_request
***************************************/
ActStatus ActionHandlers::process_service_request(ControlBlock& cb)
{
    log_msg(LOG_DEBUG, "Inside process_service_request \n");
	
	UEContext *ue_ctxt = dynamic_cast<UEContext*>(cb.getPermDataBlock());

	if (ue_ctxt == NULL )
	{
		log_msg(LOG_DEBUG, "process_service_request: ue ctxt is NULL \n");
		return ActStatus::HALT;
	}
	
	log_msg(LOG_DEBUG, "Leaving process_service_request \n");

	ProcedureStats::num_of_service_request_received ++;

	return ActStatus::PROCEED;
}

/***************************************
* Action handler : send_ddn_ack_to_sgw
***************************************/
ActStatus ActionHandlers::send_ddn_ack_to_sgw(ControlBlock& cb)
{
    log_msg(LOG_DEBUG, "Inside send_ddn_ack_to_sgw \n");
		
	UEContext *ue_ctxt = static_cast<UEContext*>(cb.getPermDataBlock());
	MmeSvcReqProcedureCtxt* srPrcdCtxt_p = dynamic_cast<MmeSvcReqProcedureCtxt*>(cb.getTempDataBlock());
	
	if (ue_ctxt == NULL || srPrcdCtxt_p == NULL)
	{
	    log_msg(LOG_DEBUG, "send_ddn_ack_to_sgw: ue ctxt or MmeSvcReqProcedureCtxt is NULL \n");
	    return ActStatus::HALT;
	}

	DDN_ACK_Q_msg ddn_ack;
	ddn_ack.msg_type = ddn_acknowledgement;
	ddn_ack.ue_idx= ue_ctxt->getContextID();
	ddn_ack.seq_no= srPrcdCtxt_p->getDdnSeqNo();
	ddn_ack.cause = 16;
	
	cmn::ipc::IpcAddress destAddr;
	destAddr.u32 = TipcServiceInstance::s11AppInstanceNum_c;

	mmeIpcIf_g->dispatchIpcMsg((char *) &ddn_ack, sizeof(ddn_ack), destAddr);
	
	log_msg(LOG_DEBUG, "Leaving send_ddn_ack_to_sgw \n");

	ProcedureStats::num_of_ddn_ack_sent ++;
	
	return ActStatus::PROCEED;
}

/***************************************
* Action handler : perform_auth_and_sec_check
***************************************/
ActStatus ActionHandlers::perform_auth_and_sec_check(ControlBlock& cb)
{
    log_msg(LOG_DEBUG, "Inside auth_and_sec_check \n");
	SM::ControlBlock* controlBlk_p = SubsDataGroupManager::Instance()->findControlBlock(cb.getCBIndex());	
	UEContext *ue_ctxt = dynamic_cast<UEContext*>(cb.getPermDataBlock());
	
	if (ue_ctxt == NULL)
	{
		log_msg(LOG_DEBUG, "auth_and_sec_check: ue context is NULL\n");
		return ActStatus::HALT;
	}
	
	log_msg(LOG_DEBUG, "Leaving auth_and_sec_check \n");
	

	SM::Event evt(Event_e::AUTH_AND_SEC_CHECK_COMPLETE, NULL);

	controlBlk_p->addEventToProcQ(evt);

	
	return ActStatus::PROCEED;
}
/***************************************************
* Action handler : send_init_ctxt_req_to_ue_svc_req
****************************************************/
ActStatus ActionHandlers::send_init_ctxt_req_to_ue_svc_req(ControlBlock& cb)
{
    log_msg(LOG_DEBUG, "Inside send_init_ctxt_req_to_ue_svc_req \n");

        UEContext *ue_ctxt = dynamic_cast<UEContext*>(cb.getPermDataBlock());
        if (ue_ctxt == NULL )
        {
                log_msg(LOG_DEBUG, "send_init_ctxt_req_to_ue_svc_req : ue context is NULL \n");
                return ActStatus::HALT;
        }

        SessionContext* sessionCtxt = ue_ctxt->getSessionContext();
        if (sessionCtxt == NULL)
        {
                log_msg(LOG_DEBUG, "send_init_ctxt_req_to_ue_svc_req : session ctxt is NULL \n");
                return ActStatus::HALT;
        }

        unsigned int nas_count = 0;
        E_UTRAN_sec_vector* secVect = const_cast<E_UTRAN_sec_vector*>(ue_ctxt->getAiaSecInfo().AiaSecInfo_mp);
        secinfo& secInfo = const_cast<secinfo&>(ue_ctxt->getUeSecInfo().secinfo_m);

        SecUtils::create_kenb_key(secVect->kasme.val, secInfo.kenb_key, nas_count);

        ics_req_paging_Q_msg icr_msg;
        icr_msg.msg_type = ics_req_paging;
        icr_msg.ue_idx = ue_ctxt->getContextID();
        icr_msg.enb_fd = ue_ctxt->getEnbFd();
        icr_msg.enb_s1ap_ue_id = ue_ctxt->getS1apEnbUeId();

        icr_msg.ueag_max_ul_bitrate = (ue_ctxt->getAmbr().ambr_m).max_requested_bw_dl;
        icr_msg.ueag_max_dl_bitrate = (ue_ctxt->getAmbr().ambr_m).max_requested_bw_ul;
        BearerContext* bearerCtxt = sessionCtxt->getBearerContext();
        icr_msg.bearer_id = bearerCtxt->getBearerId();

        
       	memcpy(&(icr_msg.gtp_teid), &(bearerCtxt->getS1uSgwUserFteid().fteid_m), sizeof(struct fteid));
        memcpy(&(icr_msg.sec_key), &((ue_ctxt->getUeSecInfo().secinfo_m).kenb_key),
                        KENB_SIZE);

        //ue_ctxt->setdwnLnkSeqNo(icr_msg.dl_seq_no+1);

        cmn::ipc::IpcAddress destAddr;
        destAddr.u32 = TipcServiceInstance::s1apAppInstanceNum_c;

        mmeIpcIf_g->dispatchIpcMsg((char *) &icr_msg, sizeof(icr_msg), destAddr);

        ProcedureStats::num_of_init_ctxt_req_to_ue_sent ++;
        log_msg(LOG_DEBUG, "Leaving send_init_ctxt_req_to_ue_svc_req_ \n");

    	return ActStatus::PROCEED;
}

/***************************************
* Action handler : process_init_ctxt_resp_svc_req
***************************************/
ActStatus ActionHandlers::process_init_ctxt_resp_svc_req(ControlBlock& cb)
{
    	log_msg(LOG_DEBUG, "Inside process_init_ctxt_resp_svc_req \n");

        UEContext *ue_ctxt = dynamic_cast<UEContext*>(cb.getPermDataBlock());
        MmeProcedureCtxt *procCtxt = dynamic_cast<MmeProcedureCtxt*>(cb.getTempDataBlock());

        if (ue_ctxt == NULL || procCtxt == NULL)
        {
                log_msg(LOG_DEBUG, "process_init_ctxt_resp_svc_req: ue context or procedure ctxt is NULL \n");
                return ActStatus::HALT;
        }

        SessionContext* sessionCtxt = ue_ctxt->getSessionContext();
        if (sessionCtxt == NULL)
        {
                log_msg(LOG_DEBUG, "process_init_ctxt_resp_svc_req: session ctxt is NULL \n");
                return ActStatus::HALT;
        }

        MsgBuffer* msgBuf = static_cast<MsgBuffer*>(cb.getMsgData());

        if (msgBuf == NULL)
                return ActStatus::HALT;

        const s1_incoming_msg_data_t* s1_msg_data = static_cast<const s1_incoming_msg_data_t*>(msgBuf->getDataPointer());
        const struct initctx_resp_Q_msg &ics_res =s1_msg_data->msg_data.initctx_resp_Q_msg_m;

        fteid S1uEnbUserFteid;
        S1uEnbUserFteid.header.iface_type = 0;
        S1uEnbUserFteid.header.v4 = 1;
        S1uEnbUserFteid.header.teid_gre = ics_res.gtp_teid;
        S1uEnbUserFteid.ip.ipv4 = *(struct in_addr*)&ics_res.transp_layer_addr;
	
	    BearerContext* bearerCtxt = sessionCtxt->getBearerContext();
	    if (bearerCtxt)
	        bearerCtxt->setS1uEnbUserFteid(Fteid(S1uEnbUserFteid));

        ProcedureStats::num_of_processed_init_ctxt_resp ++;
        log_msg(LOG_DEBUG, "Leaving process_init_ctxt_resp_svc_req \n");

	return ActStatus::PROCEED;
}


/***************************************
* Action handler : send_mb_req_to_sgw_svc_req
***************************************/
ActStatus ActionHandlers::send_mb_req_to_sgw_svc_req(ControlBlock& cb)
{
    	log_msg(LOG_DEBUG, "Inside send_mb_req_to_sgw_svc_req \n");

        UEContext *ue_ctxt = dynamic_cast<UEContext*>(cb.getPermDataBlock());
        MmeProcedureCtxt *procCtxt = dynamic_cast<MmeProcedureCtxt*>(cb.getTempDataBlock());

        if (ue_ctxt == NULL || procCtxt == NULL)
        {
                log_msg(LOG_DEBUG, "send_mb_req_to_sgw_svc_req: ue context or procedure ctxt is NULL \n");
                return ActStatus::HALT;
        }

        SessionContext* sessionCtxt = ue_ctxt->getSessionContext();
        if (sessionCtxt == NULL)
        {
                log_msg(LOG_DEBUG, "send_mb_req_to_sgw_svc_req: session ctxt is NULL \n");
                return ActStatus::HALT;
        }

        struct MB_Q_msg mb_msg;
        mb_msg.msg_type = modify_bearer_request;
        mb_msg.ue_idx = ue_ctxt->getContextID();

        memset(mb_msg.indication, 0, S11_MB_INDICATION_FLAG_SIZE); /*TODO : future*/
        BearerContext* bearerCtxt = sessionCtxt->getBearerContext();
        mb_msg.bearer_id = bearerCtxt->getBearerId();

        memcpy(&(mb_msg.s11_sgw_c_fteid), &(sessionCtxt->getS11SgwCtrlFteid().fteid_m),
                sizeof(struct fteid));

        memcpy(&(mb_msg.s1u_enb_fteid), &(bearerCtxt->getS1uEnbUserFteid().fteid_m),
                sizeof(struct fteid));


        cmn::ipc::IpcAddress destAddr;
        destAddr.u32 = TipcServiceInstance::s11AppInstanceNum_c;

        mmeIpcIf_g->dispatchIpcMsg((char *) &mb_msg, sizeof(mb_msg), destAddr);

        ProcedureStats::num_of_mb_req_to_sgw_sent ++;
        log_msg(LOG_DEBUG, "Leaving send_mb_req_to_sgw_svc_req \n");

        return ActStatus::PROCEED;
}

/***************************************
* Action handler : process_mb_resp_svc_req
***************************************/
ActStatus ActionHandlers::process_mb_resp_svc_req(ControlBlock& cb)
{
   	log_msg(LOG_DEBUG, "Inside process_mb_resp_svc_req \n");

	ProcedureStats::num_of_processed_mb_resp ++;

	MmeContextManagerUtils::deallocateProcedureCtxt(cb, serviceRequest_c);

	return ActStatus::PROCEED;
}