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tcp-newreno.h
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2010 Adrian Sai-wah Tam
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation;
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  *
18  * Author: Adrian Sai-wah Tam <adrian.sw.tam@gmail.com>
19  */
20 
21 #ifndef TCP_NEWRENO_H
22 #define TCP_NEWRENO_H
23 
24 #include "tcp-socket-base.h"
25 
26 namespace ns3 {
27 
36 class TcpNewReno : public TcpSocketBase
37 {
38 public:
39  static TypeId GetTypeId (void);
43  TcpNewReno (void);
44  TcpNewReno (const TcpNewReno& sock);
45  virtual ~TcpNewReno (void);
46 
47  // From TcpSocketBase
48  virtual int Connect (const Address &address);
49  virtual int Listen (void);
50 
51 protected:
52  virtual uint32_t Window (void); // Return the max possible number of unacked bytes
53  virtual Ptr<TcpSocketBase> Fork (void); // Call CopyObject<TcpNewReno> to clone me
54  virtual void NewAck (SequenceNumber32 const& seq); // Inc cwnd and call NewAck() of parent
55  virtual void DupAck (const TcpHeader& t, uint32_t count); // Halving cwnd and reset nextTxSequence
56  virtual void Retransmit (void); // Exit fast recovery upon retransmit timeout
57 
58  // Implementing ns3::TcpSocket -- Attribute get/set
59  virtual void SetSegSize (uint32_t size);
60  virtual void SetSSThresh (uint32_t threshold);
61  virtual uint32_t GetSSThresh (void) const;
62  virtual void SetInitialCwnd (uint32_t cwnd);
63  virtual uint32_t GetInitialCwnd (void) const;
64 private:
65  void InitializeCwnd (void); // set m_cWnd when connection starts
66 
67 protected:
68  TracedValue<uint32_t> m_cWnd; //< Congestion window
69  uint32_t m_ssThresh; //< Slow Start Threshold
70  uint32_t m_initialCWnd; //< Initial cWnd value
71  SequenceNumber32 m_recover; //< Previous highest Tx seqnum for fast recovery
72  uint32_t m_retxThresh; //< Fast Retransmit threshold
73  bool m_inFastRec; //< currently in fast recovery
74  bool m_limitedTx; //< perform limited transmit
75 };
76 
77 } // namespace ns3
78 
79 #endif /* TCP_NEWRENO_H */