/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2007 Georgia Tech Research Corporation

 *

 * 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: Raj Bhattacharjea <raj.b@gatech.edu>

 */

#include "ns3/assert.h"

#include "ns3/log.h"

#include "ns3/nstime.h"

#include "ns3/boolean.h"

#include "ns3/packet.h"

#include "ns3/node.h"

#include "tcp-l4-protocol.h"

#include "tcp-header.h"

#include "ipv4-end-point-demux.h"

#include "ipv4-end-point.h"

#include "ipv4-l3-protocol.h"

#include "tcp-socket-impl.h"

#include "tcp-typedefs.h"

#include <vector>

#include <sstream>

#include <iomanip>

NS_LOG_COMPONENT_DEFINE ("TcpL4Protocol");

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (TcpL4Protocol);

//State Machine things --------------------------------------------------------

TcpStateMachine::TcpStateMachine() 

  : aT (LAST_STATE, StateActionVec_t(LAST_EVENT)),

       eV (MAX_FLAGS)

{ 

  NS_LOG_FUNCTION_NOARGS ();

  // Create the state table

  // Closed state

  aT[CLOSED][APP_LISTEN]  = SA (LISTEN,   NO_ACT);

  aT[CLOSED][APP_CONNECT] = SA (SYN_SENT, SYN_TX);

  aT[CLOSED][APP_SEND]    = SA (CLOSED,   RST_TX);

  aT[CLOSED][SEQ_RECV]    = SA (CLOSED,   NO_ACT);

  aT[CLOSED][APP_CLOSE]   = SA (CLOSED,   NO_ACT);

  aT[CLOSED][TIMEOUT]     = SA (CLOSED,   RST_TX);

  aT[CLOSED][ACK_RX]      = SA (CLOSED,   RST_TX);

  aT[CLOSED][SYN_RX]      = SA (CLOSED,   RST_TX);

  aT[CLOSED][SYN_ACK_RX]  = SA (CLOSED,   RST_TX);

  aT[CLOSED][FIN_RX]      = SA (CLOSED,   RST_TX);

  aT[CLOSED][FIN_ACK_RX]  = SA (CLOSED,   RST_TX);

  aT[CLOSED][RST_RX]      = SA (CLOSED,   CANCEL_TM);

  aT[CLOSED][BAD_FLAGS]   = SA (CLOSED,   RST_TX);

  // Listen State

  // For the listen state, anything other than CONNECT or SEND

  // is simply ignored....this likely indicates the child TCP

  // has finished and issued unbind call, but the remote end

  // has not yet  closed.

  aT[LISTEN][APP_LISTEN]  = SA (LISTEN,   NO_ACT);

  aT[LISTEN][APP_CONNECT] = SA (SYN_SENT, SYN_TX);

  aT[LISTEN][APP_SEND]    = SA (SYN_SENT, SYN_TX);

  aT[LISTEN][SEQ_RECV]    = SA (LISTEN,   NO_ACT);

  aT[LISTEN][APP_CLOSE]   = SA (CLOSED,   NO_ACT);

  aT[LISTEN][TIMEOUT]     = SA (LISTEN,   NO_ACT);

  aT[LISTEN][ACK_RX]      = SA (LISTEN,   NO_ACT);

  aT[LISTEN][SYN_RX]      = SA (LISTEN,   SYN_ACK_TX);//stay in listen and fork

  aT[LISTEN][SYN_ACK_RX]  = SA (LISTEN,   NO_ACT);

  aT[LISTEN][FIN_RX]      = SA (LISTEN,   NO_ACT);

  aT[LISTEN][FIN_ACK_RX]  = SA (LISTEN,   NO_ACT);

  aT[LISTEN][RST_RX]      = SA (LISTEN,   NO_ACT);

  aT[LISTEN][BAD_FLAGS]   = SA (LISTEN,   NO_ACT);

  // Syn Sent State

  aT[SYN_SENT][APP_LISTEN]  = SA (CLOSED,      RST_TX);

  aT[SYN_SENT][APP_CONNECT] = SA (SYN_SENT,    SYN_TX);

  aT[SYN_SENT][APP_SEND]    = SA (SYN_SENT,    NO_ACT);

  aT[SYN_SENT][SEQ_RECV]    = SA (ESTABLISHED, NEW_SEQ_RX);

  aT[SYN_SENT][APP_CLOSE]   = SA (CLOSED,      RST_TX);

  aT[SYN_SENT][TIMEOUT]     = SA (CLOSED,      NO_ACT);

  aT[SYN_SENT][ACK_RX]      = SA (SYN_SENT,    NO_ACT);

  aT[SYN_SENT][SYN_RX]      = SA (SYN_RCVD,    SYN_ACK_TX);

  aT[SYN_SENT][SYN_ACK_RX]  = SA (ESTABLISHED, ACK_TX_1);

  aT[SYN_SENT][FIN_RX]      = SA (CLOSED,      RST_TX);

  aT[SYN_SENT][FIN_ACK_RX]  = SA (CLOSED,      RST_TX);

  aT[SYN_SENT][RST_RX]      = SA (CLOSED,      APP_NOTIFY);

  aT[SYN_SENT][BAD_FLAGS]   = SA (CLOSED,      RST_TX);

  // Syn Recvd State

  aT[SYN_RCVD][APP_LISTEN]  = SA (CLOSED,      RST_TX);

  aT[SYN_RCVD][APP_CONNECT] = SA (CLOSED,      RST_TX);

  aT[SYN_RCVD][APP_SEND]    = SA (CLOSED,      RST_TX);

  aT[SYN_RCVD][SEQ_RECV]    = SA (ESTABLISHED, NEW_SEQ_RX);

  aT[SYN_RCVD][APP_CLOSE]   = SA (FIN_WAIT_1,  FIN_TX);

  aT[SYN_RCVD][TIMEOUT]     = SA (CLOSED,      RST_TX);

  aT[SYN_RCVD][ACK_RX]      = SA (ESTABLISHED, SERV_NOTIFY);

  aT[SYN_RCVD][SYN_RX]      = SA (SYN_RCVD,    SYN_ACK_TX);

  aT[SYN_RCVD][SYN_ACK_RX]  = SA (CLOSED,      RST_TX);

  aT[SYN_RCVD][FIN_RX]      = SA (CLOSED,      RST_TX);

  aT[SYN_RCVD][FIN_ACK_RX]  = SA (CLOSE_WAIT,  PEER_CLOSE);

  aT[SYN_RCVD][RST_RX]      = SA (CLOSED,      CANCEL_TM);

  aT[SYN_RCVD][BAD_FLAGS]   = SA (CLOSED,      RST_TX);

  // Established State

  aT[ESTABLISHED][APP_LISTEN] = SA (CLOSED,     RST_TX);

  aT[ESTABLISHED][APP_CONNECT]= SA (CLOSED,     RST_TX);

  aT[ESTABLISHED][APP_SEND]   = SA (ESTABLISHED,TX_DATA);

  aT[ESTABLISHED][SEQ_RECV]   = SA (ESTABLISHED,NEW_SEQ_RX);

  aT[ESTABLISHED][APP_CLOSE]  = SA (FIN_WAIT_1, FIN_TX);

  aT[ESTABLISHED][TIMEOUT]    = SA (ESTABLISHED,RETX);

  aT[ESTABLISHED][ACK_RX]     = SA (ESTABLISHED,NEW_ACK);

  aT[ESTABLISHED][SYN_RX]     = SA (SYN_RCVD,   SYN_ACK_TX);

  aT[ESTABLISHED][SYN_ACK_RX] = SA (ESTABLISHED,NO_ACT);

  aT[ESTABLISHED][FIN_RX]     = SA (CLOSE_WAIT, PEER_CLOSE);

  aT[ESTABLISHED][FIN_ACK_RX] = SA (CLOSE_WAIT, PEER_CLOSE);

  aT[ESTABLISHED][RST_RX]     = SA (CLOSED,     CANCEL_TM);

  aT[ESTABLISHED][BAD_FLAGS]  = SA (CLOSED,     RST_TX);

  // Close Wait State

  aT[CLOSE_WAIT][APP_LISTEN]  = SA (CLOSED,     RST_TX);

  aT[CLOSE_WAIT][APP_CONNECT] = SA (SYN_SENT,   SYN_TX);

  aT[CLOSE_WAIT][APP_SEND]    = SA (CLOSE_WAIT, TX_DATA);

  aT[CLOSE_WAIT][SEQ_RECV]    = SA (CLOSE_WAIT, NEW_SEQ_RX);

  aT[CLOSE_WAIT][APP_CLOSE]   = SA (LAST_ACK,   FIN_ACK_TX);

  aT[CLOSE_WAIT][TIMEOUT]     = SA (CLOSE_WAIT, NO_ACT);

  aT[CLOSE_WAIT][ACK_RX]      = SA (CLOSE_WAIT, NO_ACT);

  aT[CLOSE_WAIT][SYN_RX]      = SA (CLOSED,     RST_TX);

  aT[CLOSE_WAIT][SYN_ACK_RX]  = SA (CLOSED,     RST_TX);

  aT[CLOSE_WAIT][FIN_RX]      = SA (CLOSE_WAIT, ACK_TX);

  aT[CLOSE_WAIT][FIN_ACK_RX]  = SA (CLOSE_WAIT, ACK_TX);

  aT[CLOSE_WAIT][RST_RX]      = SA (CLOSED,     CANCEL_TM);

  aT[CLOSE_WAIT][BAD_FLAGS]   = SA (CLOSED,     RST_TX);

  // Close Last Ack State

  aT[LAST_ACK][APP_LISTEN]  = SA (CLOSED,      RST_TX);

  aT[LAST_ACK][APP_CONNECT] = SA (SYN_SENT,    SYN_TX);

  aT[LAST_ACK][APP_SEND]    = SA (CLOSED,      RST_TX);

  aT[LAST_ACK][SEQ_RECV]    = SA (LAST_ACK,    NEW_SEQ_RX);

  aT[LAST_ACK][APP_CLOSE]   = SA (CLOSED,      NO_ACT);

  aT[LAST_ACK][TIMEOUT]     = SA (CLOSED,      NO_ACT);

  aT[LAST_ACK][ACK_RX]      = SA (CLOSED,      APP_CLOSED);

  aT[LAST_ACK][SYN_RX]      = SA (CLOSED,      RST_TX);

  aT[LAST_ACK][SYN_ACK_RX]  = SA (CLOSED,      RST_TX);

  aT[LAST_ACK][FIN_RX]      = SA (LAST_ACK,    FIN_ACK_TX);

  aT[LAST_ACK][FIN_ACK_RX]  = SA (CLOSED,      NO_ACT);

  aT[LAST_ACK][RST_RX]      = SA (CLOSED,      CANCEL_TM);

  aT[LAST_ACK][BAD_FLAGS]   = SA (CLOSED,      RST_TX);

  // FIN_WAIT_1 state

  aT[FIN_WAIT_1][APP_LISTEN]  = SA (CLOSED,     RST_TX);

  aT[FIN_WAIT_1][APP_CONNECT] = SA (CLOSED,     RST_TX);

  aT[FIN_WAIT_1][APP_SEND]    = SA (CLOSED,     RST_TX);

  aT[FIN_WAIT_1][SEQ_RECV]    = SA (FIN_WAIT_1, NEW_SEQ_RX);

  aT[FIN_WAIT_1][APP_CLOSE]   = SA (FIN_WAIT_1, NO_ACT);

  aT[FIN_WAIT_1][TIMEOUT]     = SA (FIN_WAIT_1, NO_ACT);

  aT[FIN_WAIT_1][ACK_RX]      = SA (FIN_WAIT_2, NEW_ACK);

  aT[FIN_WAIT_1][SYN_RX]      = SA (CLOSED,     RST_TX);

  aT[FIN_WAIT_1][SYN_ACK_RX]  = SA (CLOSED,     RST_TX);

  aT[FIN_WAIT_1][FIN_RX]      = SA (CLOSING,    ACK_TX);

  aT[FIN_WAIT_1][FIN_ACK_RX]  = SA (TIMED_WAIT, ACK_TX);

  aT[FIN_WAIT_1][RST_RX]      = SA (CLOSED,     CANCEL_TM);

  aT[FIN_WAIT_1][BAD_FLAGS]   = SA (CLOSED,     RST_TX);

  // FIN_WAIT_2 state

  aT[FIN_WAIT_2][APP_LISTEN]  = SA (CLOSED,      RST_TX);

  aT[FIN_WAIT_2][APP_CONNECT] = SA (CLOSED,      RST_TX);

  aT[FIN_WAIT_2][APP_SEND]    = SA (CLOSED,      RST_TX);

  aT[FIN_WAIT_2][SEQ_RECV]    = SA (FIN_WAIT_2,  NEW_SEQ_RX);

  aT[FIN_WAIT_2][APP_CLOSE]   = SA (FIN_WAIT_2,  NO_ACT);

  aT[FIN_WAIT_2][TIMEOUT]     = SA (FIN_WAIT_2,  NO_ACT);

  aT[FIN_WAIT_2][ACK_RX]      = SA (FIN_WAIT_2,  NEW_ACK);

  aT[FIN_WAIT_2][SYN_RX]      = SA (CLOSED,      RST_TX);

  aT[FIN_WAIT_2][SYN_ACK_RX]  = SA (CLOSED,      RST_TX);

  aT[FIN_WAIT_2][FIN_RX]      = SA (TIMED_WAIT,  ACK_TX);

  aT[FIN_WAIT_2][FIN_ACK_RX]  = SA (TIMED_WAIT,  ACK_TX);

  aT[FIN_WAIT_2][RST_RX]      = SA (CLOSED,      CANCEL_TM);

  aT[FIN_WAIT_2][BAD_FLAGS]   = SA (CLOSED,      RST_TX);

  // CLOSING state

  aT[CLOSING][APP_LISTEN]  = SA (CLOSED,      RST_TX);

  aT[CLOSING][APP_CONNECT] = SA (CLOSED,      RST_TX);

  aT[CLOSING][APP_SEND]    = SA (CLOSED,      RST_TX);

  aT[CLOSING][SEQ_RECV]    = SA (CLOSED,      RST_TX);

  aT[CLOSING][APP_CLOSE]   = SA (CLOSED,      RST_TX);

  aT[CLOSING][TIMEOUT]     = SA (CLOSING,     NO_ACT);

  aT[CLOSING][ACK_RX]      = SA (TIMED_WAIT,  NO_ACT);

  aT[CLOSING][SYN_RX]      = SA (CLOSED,      RST_TX);

  aT[CLOSING][SYN_ACK_RX]  = SA (CLOSED,      RST_TX);

  aT[CLOSING][FIN_RX]      = SA (CLOSED,      ACK_TX);

  aT[CLOSING][FIN_ACK_RX]  = SA (CLOSED,      ACK_TX);

  aT[CLOSING][RST_RX]      = SA (CLOSED,      CANCEL_TM);

  aT[CLOSING][BAD_FLAGS]   = SA (CLOSED,      RST_TX);

  // TIMED_WAIT state

  aT[TIMED_WAIT][APP_LISTEN]  = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][APP_CONNECT] = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][APP_SEND]    = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][SEQ_RECV]    = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][APP_CLOSE]   = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][TIMEOUT]     = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][ACK_RX]      = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][SYN_RX]      = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][SYN_ACK_RX]  = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][FIN_RX]      = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][FIN_ACK_RX]  = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][RST_RX]      = SA (TIMED_WAIT, NO_ACT);

  aT[TIMED_WAIT][BAD_FLAGS]   = SA (TIMED_WAIT, NO_ACT);

  // Create the flags lookup table

  eV[ 0x00] = SEQ_RECV;  // No flags

  eV[ 0x01] = FIN_RX;    // Fin

  eV[ 0x02] = SYN_RX;    // Syn

  eV[ 0x03] = BAD_FLAGS; // Illegal

  eV[ 0x04] = RST_RX;    // Rst

  eV[ 0x05] = BAD_FLAGS; // Illegal

  eV[ 0x06] = BAD_FLAGS; // Illegal

  eV[ 0x07] = BAD_FLAGS; // Illegal

  eV[ 0x08] = SEQ_RECV;  // Psh flag is not used

  eV[ 0x09] = FIN_RX;    // Fin

  eV[ 0x0a] = SYN_RX;    // Syn

  eV[ 0x0b] = BAD_FLAGS; // Illegal

  eV[ 0x0c] = RST_RX;    // Rst

  eV[ 0x0d] = BAD_FLAGS; // Illegal

  eV[ 0x0e] = BAD_FLAGS; // Illegal

  eV[ 0x0f] = BAD_FLAGS; // Illegal

  eV[ 0x10] = ACK_RX;    // Ack

  eV[ 0x11] = FIN_ACK_RX;// Fin/Ack

  eV[ 0x12] = SYN_ACK_RX;// Syn/Ack

  eV[ 0x13] = BAD_FLAGS; // Illegal

  eV[ 0x14] = RST_RX;    // Rst

  eV[ 0x15] = BAD_FLAGS; // Illegal

  eV[ 0x16] = BAD_FLAGS; // Illegal

  eV[ 0x17] = BAD_FLAGS; // Illegal

  eV[ 0x18] = ACK_RX;    // Ack

  eV[ 0x19] = FIN_ACK_RX;// Fin/Ack

  eV[ 0x1a] = SYN_ACK_RX;// Syn/Ack

  eV[ 0x1b] = BAD_FLAGS; // Illegal

  eV[ 0x1c] = RST_RX;    // Rst

  eV[ 0x1d] = BAD_FLAGS; // Illegal

  eV[ 0x1e] = BAD_FLAGS; // Illegal

  eV[ 0x1f] = BAD_FLAGS; // Illegal

  eV[ 0x20] = SEQ_RECV;  // No flags (Urgent not presently used)

  eV[ 0x21] = FIN_RX;    // Fin

  eV[ 0x22] = SYN_RX;    // Syn

  eV[ 0x23] = BAD_FLAGS; // Illegal

  eV[ 0x24] = RST_RX;    // Rst

  eV[ 0x25] = BAD_FLAGS; // Illegal

  eV[ 0x26] = BAD_FLAGS; // Illegal

  eV[ 0x27] = BAD_FLAGS; // Illegal

  eV[ 0x28] = SEQ_RECV;  // Psh flag is not used

  eV[ 0x29] = FIN_RX;    // Fin

  eV[ 0x2a] = SYN_RX;    // Syn

  eV[ 0x2b] = BAD_FLAGS; // Illegal

  eV[ 0x2c] = RST_RX;    // Rst

  eV[ 0x2d] = BAD_FLAGS; // Illegal

  eV[ 0x2e] = BAD_FLAGS; // Illegal

  eV[ 0x2f] = BAD_FLAGS; // Illegal

  eV[ 0x30] = ACK_RX;    // Ack (Urgent not used)

  eV[ 0x31] = FIN_ACK_RX;// Fin/Ack

  eV[ 0x32] = SYN_ACK_RX;// Syn/Ack

  eV[ 0x33] = BAD_FLAGS; // Illegal

  eV[ 0x34] = RST_RX;    // Rst

  eV[ 0x35] = BAD_FLAGS; // Illegal

  eV[ 0x36] = BAD_FLAGS; // Illegal

  eV[ 0x37] = BAD_FLAGS; // Illegal

  eV[ 0x38] = ACK_RX;    // Ack

  eV[ 0x39] = FIN_ACK_RX;// Fin/Ack

  eV[ 0x3a] = SYN_ACK_RX;// Syn/Ack

  eV[ 0x3b] = BAD_FLAGS; // Illegal

  eV[ 0x3c] = RST_RX;    // Rst

  eV[ 0x3d] = BAD_FLAGS; // Illegal

  eV[ 0x3e] = BAD_FLAGS; // Illegal

  eV[ 0x3f] = BAD_FLAGS; // Illegal

}

SA TcpStateMachine::Lookup (States_t s, Events_t e)

{

  NS_LOG_FUNCTION (this << s << e);

  return aT[s][e];

}

Events_t TcpStateMachine::FlagsEvent (uint8_t f)

{ 

  NS_LOG_FUNCTION (this << f);

  // Lookup event from flags

  if (f >= MAX_FLAGS) return BAD_FLAGS;

  return eV[f]; // Look up flags event

}

static TcpStateMachine tcpStateMachine; //only instance of a TcpStateMachine

//TcpL4Protocol stuff----------------------------------------------------------

/* see http://www.iana.org/assignments/protocol-numbers */

const uint8_t TcpL4Protocol::PROT_NUMBER = 6;

ObjectFactory

TcpL4Protocol::GetDefaultRttEstimatorFactory (void)

{

  ObjectFactory factory;

  factory.SetTypeId (RttMeanDeviation::GetTypeId ());

  return factory;

}

TypeId 

TcpL4Protocol::GetTypeId (void)

{

  static TypeId tid = TypeId ("ns3::TcpL4Protocol")

    .SetParent<Ipv4L4Protocol> ()

    .AddAttribute ("RttEstimatorFactory",

                   "How RttEstimator objects are created.",

                   ObjectFactoryValue (GetDefaultRttEstimatorFactory ()),

                   MakeObjectFactoryAccessor (&TcpL4Protocol::m_rttFactory),

                   MakeObjectFactoryChecker ())

    .AddAttribute ("CalcChecksum", "If true, we calculate the checksum of outgoing packets"

                   " and verify the checksum of incoming packets.",

                   BooleanValue (false),

                   MakeBooleanAccessor (&TcpL4Protocol::m_calcChecksum),

                   MakeBooleanChecker ())

    ;

  return tid;

}

TcpL4Protocol::TcpL4Protocol ()

  : m_endPoints (new Ipv4EndPointDemux ())

{

  NS_LOG_FUNCTION_NOARGS ();

  NS_LOG_LOGIC("Made a TcpL4Protocol "<<this);

}

TcpL4Protocol::~TcpL4Protocol ()

{

  NS_LOG_FUNCTION_NOARGS ();

}

void 

TcpL4Protocol::SetNode (Ptr<Node> node)

{

  m_node = node;

}

int 

TcpL4Protocol::GetProtocolNumber (void) const

{

  return PROT_NUMBER;

}

void

TcpL4Protocol::DoDispose (void)

{

  NS_LOG_FUNCTION_NOARGS ();

  if (m_endPoints != 0)

    {

      delete m_endPoints;

      m_endPoints = 0;

    }

  m_node = 0;

  Ipv4L4Protocol::DoDispose ();

}

Ptr<Socket>

TcpL4Protocol::CreateSocket (void)

{

  NS_LOG_FUNCTION_NOARGS ();

  Ptr<RttEstimator> rtt = m_rttFactory.Create<RttEstimator> ();

  Ptr<TcpSocketImpl> socket = CreateObject<TcpSocketImpl> ();

  socket->SetNode (m_node);

  socket->SetTcp (this);

  socket->SetRtt (rtt);

  return socket;

}

Ipv4EndPoint *

TcpL4Protocol::Allocate (void)

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_endPoints->Allocate ();

}

Ipv4EndPoint *

TcpL4Protocol::Allocate (Ipv4Address address)

{

  NS_LOG_FUNCTION (this << address);

  return m_endPoints->Allocate (address);

}

Ipv4EndPoint *

TcpL4Protocol::Allocate (uint16_t port)

{

  NS_LOG_FUNCTION (this << port);

  return m_endPoints->Allocate (port);

}

Ipv4EndPoint *

TcpL4Protocol::Allocate (Ipv4Address address, uint16_t port)

{

  NS_LOG_FUNCTION (this << address << port);

  return m_endPoints->Allocate (address, port);

}

Ipv4EndPoint *

TcpL4Protocol::Allocate (Ipv4Address localAddress, uint16_t localPort,

                         Ipv4Address peerAddress, uint16_t peerPort)

{

  NS_LOG_FUNCTION (this << localAddress << localPort << peerAddress << peerPort);

  return m_endPoints->Allocate (localAddress, localPort,

                                peerAddress, peerPort);

}

void 

TcpL4Protocol::DeAllocate (Ipv4EndPoint *endPoint)

{

  NS_LOG_FUNCTION (this << endPoint);

  m_endPoints->DeAllocate (endPoint);

}

void 

TcpL4Protocol::Receive (Ptr<Packet> packet,

             Ipv4Address const &source,

             Ipv4Address const &destination,

             Ptr<Ipv4Interface> incomingInterface)

{

  NS_LOG_FUNCTION (this << packet << source << destination << incomingInterface);

  TcpHeader tcpHeader;

  if(m_calcChecksum)

  {

    tcpHeader.EnableChecksums();

    tcpHeader.InitializeChecksum (source, destination, PROT_NUMBER);

  }

  packet->PeekHeader (tcpHeader);

  NS_LOG_LOGIC("TcpL4Protocol " << this

               << " receiving seq " << tcpHeader.GetSequenceNumber()

               << " ack " << tcpHeader.GetAckNumber()

               << " flags "<< std::hex << (int)tcpHeader.GetFlags() << std::dec

               << " data size " << packet->GetSize());

  if(!tcpHeader.IsChecksumOk ())

  {

    NS_LOG_INFO("Bad checksum, dropping packet!");

    return;

  }

  NS_LOG_LOGIC ("TcpL4Protocol "<<this<<" received a packet");

  Ipv4EndPointDemux::EndPoints endPoints =

    m_endPoints->Lookup (destination, tcpHeader.GetDestinationPort (),

                         source, tcpHeader.GetSourcePort (),incomingInterface);

  if (endPoints.empty ())

  {

    NS_LOG_LOGIC ("  No endpoints matched on TcpL4Protocol "<<this);

    std::ostringstream oss;

    oss<<"  destination IP: ";

    destination.Print (oss);

    oss<<" destination port: "<< tcpHeader.GetDestinationPort ()<<" source IP: ";

    source.Print (oss);

    oss<<" source port: "<<tcpHeader.GetSourcePort ();

    NS_LOG_LOGIC (oss.str ());

    return;

  }

  NS_ASSERT_MSG (endPoints.size() == 1 , "Demux returned more than one endpoint");

  NS_LOG_LOGIC ("TcpL4Protocol "<<this<<" forwarding up to endpoint/socket");

  (*endPoints.begin ())->ForwardUp (packet, source, tcpHeader.GetSourcePort ());

}

void

TcpL4Protocol::Send (Ptr<Packet> packet, 

           Ipv4Address saddr, Ipv4Address daddr, 

           uint16_t sport, uint16_t dport)

{

  NS_LOG_FUNCTION (this << packet << saddr << daddr << sport << dport);

  TcpHeader tcpHeader;

  tcpHeader.SetDestinationPort (dport);

  tcpHeader.SetSourcePort (sport);

  if(m_calcChecksum)

  {

    tcpHeader.EnableChecksums();

  }

  tcpHeader.InitializeChecksum (saddr,

                               daddr,

                               PROT_NUMBER);

  tcpHeader.SetFlags (TcpHeader::ACK);

  tcpHeader.SetAckNumber (0);

  packet->AddHeader (tcpHeader);

  Ptr<Ipv4L3Protocol> ipv4 = 

    m_node->GetObject<Ipv4L3Protocol> ();

  if (ipv4 != 0)

    {

      ipv4->Send (packet, saddr, daddr, PROT_NUMBER);

    }

}

void

TcpL4Protocol::SendPacket (Ptr<Packet> packet, TcpHeader outgoingHeader,

                               Ipv4Address saddr, Ipv4Address daddr)