epc-mme-application.h

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/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * 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 "ns3/application.h"
#include "ns3/socket.h"
#include "ns3/epc-s1ap-sap.h"

namespace ns3 {

class EpcMmeApplication : public Application
{
  friend class MemberEpcS1apSapMme<EpcMmeApplication>;

public:
  static TypeId GetTypeId (void);
  virtual void DoDispose ();

  EpcMmeApplication ();

  virtual ~EpcMmeApplication ();

  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