tcp-congestion-ops.h

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2015 Natale Patriciello <natale.patriciello@gmail.com>
 *
 * 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
 *
 */
#ifndef TCPCONGESTIONOPS_H
#define TCPCONGESTIONOPS_H

#include "ns3/object.h"
#include "ns3/timer.h"

namespace ns3 {

class TcpSocketState;
class TcpSocketBase;

class TcpCongestionOps : public Object
{
public:
  static TypeId GetTypeId (void);

  TcpCongestionOps ();
  TcpCongestionOps (const TcpCongestionOps &other);

  virtual ~TcpCongestionOps ();

  virtual std::string GetName () const = 0;

  virtual uint32_t GetSsThresh (Ptr<const TcpSocketState> tcb,
                                uint32_t bytesInFlight) = 0;

  virtual void IncreaseWindow (Ptr<TcpSocketState> tcb, uint32_t segmentsAcked) = 0;

  virtual void PktsAcked (Ptr<TcpSocketState> tcb, uint32_t segmentsAcked,
                          const Time& rtt) { }

  // Present in Linux but not in ns-3 yet:
  /* call before changing ca_state (optional) */
  // void (*set_state)(struct sock *sk, u8 new_state);
  /* call when cwnd event occurs (optional) */
  // void (*cwnd_event)(struct sock *sk, enum tcp_ca_event ev);
  /* call when ack arrives (optional) */
  // void (*in_ack_event)(struct sock *sk, u32 flags);
  /* new value of cwnd after loss (optional) */
  // u32  (*undo_cwnd)(struct sock *sk);
  /* hook for packet ack accounting (optional) */
  // void (*pkts_acked)(struct sock *sk, u32 num_acked, s32 rtt_us);

  virtual Ptr<TcpCongestionOps> Fork () = 0;
};

class TcpNewReno : public TcpCongestionOps
{
public:
  static TypeId GetTypeId (void);

  TcpNewReno ();
  TcpNewReno (const TcpNewReno& sock);

  ~TcpNewReno ();

  std::string GetName () const;

  virtual void IncreaseWindow (Ptr<TcpSocketState> tcb, uint32_t segmentsAcked);
  virtual uint32_t GetSsThresh (Ptr<const TcpSocketState> tcb,
                                uint32_t bytesInFlight);

  virtual Ptr<TcpCongestionOps> Fork ();

protected:
  virtual uint32_t SlowStart (Ptr<TcpSocketState> tcb, uint32_t segmentsAcked);
  virtual void CongestionAvoidance (Ptr<TcpSocketState> tcb, uint32_t segmentsAcked);
};

} // namespace ns3

#endif // TCPCONGESTIONOPS_H