tcp-dctcp.h

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2017 NITK Surathkal
 *
 * 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: Shravya K.S. <shravya.ks0@gmail.com>
 *
 */

#ifndef TCP_DCTCP_H
#define TCP_DCTCP_H

#include "ns3/tcp-congestion-ops.h"
#include "ns3/tcp-linux-reno.h"
#include "ns3/traced-callback.h"

namespace ns3 {

class TcpDctcp : public TcpLinuxReno
{
public:
  static TypeId GetTypeId (void);

  TcpDctcp ();

  TcpDctcp (const TcpDctcp& sock);

  virtual ~TcpDctcp (void);

  // Documented in base class
  virtual std::string GetName () const;

  virtual void Init (Ptr<TcpSocketState> tcb);

  typedef void (* CongestionEstimateTracedCallback)(uint32_t bytesAcked, uint32_t bytesMarked, double alpha);

  // Documented in base class
  virtual uint32_t GetSsThresh (Ptr<const TcpSocketState> tcb,
                                uint32_t bytesInFlight);
  virtual Ptr<TcpCongestionOps> Fork ();
  virtual void PktsAcked (Ptr<TcpSocketState> tcb, uint32_t segmentsAcked,
                          const Time &rtt);
  virtual void CwndEvent (Ptr<TcpSocketState> tcb,
                          const TcpSocketState::TcpCAEvent_t event);
private:
  void CeState0to1 (Ptr<TcpSocketState> tcb);

  void CeState1to0 (Ptr<TcpSocketState> tcb);

  void UpdateAckReserved (Ptr<TcpSocketState> tcb,
                          const TcpSocketState::TcpCAEvent_t event);

  void Reset (Ptr<TcpSocketState> tcb);

  void InitializeDctcpAlpha (double alpha);

  uint32_t m_ackedBytesEcn;             
  uint32_t m_ackedBytesTotal;           
  SequenceNumber32 m_priorRcvNxt;       
  bool m_priorRcvNxtFlag;               
  double m_alpha;                       
  SequenceNumber32 m_nextSeq;           
  bool m_nextSeqFlag;                   
  bool m_ceState;                       
  bool m_delayedAckReserved;            
  double m_g;                           
  bool m_useEct0;                       
  bool m_initialized;                   

  TracedCallback<uint32_t, uint32_t, double> m_traceCongestionEstimate;
};

} // namespace ns3

#endif /* TCP_DCTCP_H */