epc-mme-application.h

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/*
 * Copyright (c) 2017-2018 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * 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 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Manuel Requena <manuel.requena@cttc.es>
 */
 
#ifndef EPC_MME_APPLICATION_H
#define EPC_MME_APPLICATION_H
 
#include "epc-gtpc-header.h"
#include "epc-s1ap-sap.h"
 
#include "ns3/application.h"
#include "ns3/socket.h"
 
#include <map>
 
namespace ns3
{
 
class EpcMmeApplication : public Application
{
    friend class MemberEpcS1apSapMme<EpcMmeApplication>;
 
  public:
    static TypeId GetTypeId();
    void DoDispose() override;
 
    EpcMmeApplication();
 
    ~EpcMmeApplication() override;
 
    EpcS1apSapMme* GetS1apSapMme();
 
    void AddSgw(Ipv4Address sgwS11Addr, Ipv4Address mmeS11Addr, Ptr<Socket> mmeS11Socket);
 
    void AddEnb(uint16_t ecgi, Ipv4Address enbS1UAddr, EpcS1apSapEnb* enbS1apSap);
 
    void AddUe(uint64_t imsi);
 
    uint8_t AddBearer(uint64_t imsi, Ptr<EpcTft> tft, EpsBearer bearer);
 
  private:
    // S1-AP SAP MME forwarded methods
 
    void DoInitialUeMessage(uint64_t mmeUeS1Id, uint16_t enbUeS1Id, uint64_t imsi, uint16_t ecgi);
 
    void DoInitialContextSetupResponse(uint64_t mmeUeS1Id,
                                       uint16_t enbUeS1Id,
                                       std::list<EpcS1apSapMme::ErabSetupItem> erabSetupList);
 
    void DoPathSwitchRequest(
        uint64_t enbUeS1Id,
        uint64_t mmeUeS1Id,
        uint16_t cgi,
        std::list<EpcS1apSapMme::ErabSwitchedInDownlinkItem> erabToBeSwitchedInDownlinkList);
 
    void DoErabReleaseIndication(
        uint64_t mmeUeS1Id,
        uint16_t enbUeS1Id,
        std::list<EpcS1apSapMme::ErabToBeReleasedIndication> erabToBeReleaseIndication);
 
    // Methods to read/process GTP-C messages of the S11 interface
 
    void RecvFromS11Socket(Ptr<Socket> socket);
 
    void DoRecvCreateSessionResponse(GtpcHeader& header, Ptr<Packet> packet);
 
    void DoRecvModifyBearerResponse(GtpcHeader& header, Ptr<Packet> packet);
 
    void DoRecvDeleteBearerRequest(GtpcHeader& header, Ptr<Packet> packet);
 
    struct BearerInfo
    {
        Ptr<EpcTft> tft;  
        EpsBearer bearer; 
        uint8_t bearerId; 
    };
 
    struct UeInfo : public SimpleRefCount<UeInfo>
    {
        uint64_t imsi;                              
        uint64_t mmeUeS1Id;                         
        uint16_t enbUeS1Id;                         
        uint16_t cellId;                            
        uint16_t bearerCounter;                     
        std::list<BearerInfo> bearersToBeActivated; 
    };
 
    std::map<uint64_t, Ptr<UeInfo>> m_ueInfoMap;
 
    void RemoveBearer(Ptr<UeInfo> ueInfo, uint8_t epsBearerId);
 
    struct EnbInfo : public SimpleRefCount<EnbInfo>
    {
        uint16_t gci;              
        Ipv4Address s1uAddr;       
        EpcS1apSapEnb* s1apSapEnb; 
    };
 
    std::map<uint16_t, Ptr<EnbInfo>> m_enbInfoMap;
 
    EpcS1apSapMme* m_s1apSapMme; 
 
    Ptr<Socket> m_s11Socket;  
    Ipv4Address m_mmeS11Addr; 
    Ipv4Address m_sgwS11Addr; 
    uint16_t m_gtpcUdpPort;   
};
 
} // namespace ns3
 
#endif // EPC_MME_APPLICATION_H