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71ef096c12754a73d85ca5f459462bb899405eb4
unison/src/internet-stack/tcp-l4-protocol.cc
Fabian Mauchle 71ef096c12 Bug 748 - Cloned TCP socket uses wrong source address
2010-02-04 14:10:13 -05:00

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/* -*- 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/object-vector.h"
#include "ns3/packet.h"
#include "ns3/node.h"
#include "ns3/simulator.h"
#include "ns3/ipv4-route.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-factory-impl.h"
#include "tcp-socket-impl.h"
#include "rtt-estimator.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, NEW_ACK);
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----------------------------------------------------------
#undef NS_LOG_APPEND_CONTEXT
#define NS_LOG_APPEND_CONTEXT \
if (m_node) { std::clog << Simulator::Now ().GetSeconds () << " [node " << m_node->GetId () << "] "; }
/* 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> ()
.AddConstructor<TcpL4Protocol> ()
.AddAttribute ("RttEstimatorFactory",
"How RttEstimator objects are created.",
ObjectFactoryValue (GetDefaultRttEstimatorFactory ()),
MakeObjectFactoryAccessor (&TcpL4Protocol::m_rttFactory),
MakeObjectFactoryChecker ())
.AddAttribute ("SocketList", "The list of sockets associated to this protocol.",
ObjectVectorValue (),
MakeObjectVectorAccessor (&TcpL4Protocol::m_sockets),
MakeObjectVectorChecker<TcpSocketImpl> ())
;
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;
}
/*
* This method is called by AddAgregate and completes the aggregation
* by setting the node in the TCP stack, link it to the ipv4 stack and
* adding TCP socket factory to the node.
*/
void
TcpL4Protocol::NotifyNewAggregate ()
{
if (m_node == 0)
{
Ptr<Node> node = this->GetObject<Node> ();
if (node != 0)
{
Ptr<Ipv4L3Protocol> ipv4 = this->GetObject<Ipv4L3Protocol> ();
if (ipv4 != 0)
{
this->SetNode (node);
ipv4->Insert (this);
Ptr<TcpSocketFactoryImpl> tcpFactory = CreateObject<TcpSocketFactoryImpl> ();
tcpFactory->SetTcp (this);
node->AggregateObject (tcpFactory);
}
}
}
Object::NotifyNewAggregate ();
}
int
TcpL4Protocol::GetProtocolNumber (void) const
{
return PROT_NUMBER;
}
void
TcpL4Protocol::DoDispose (void)
{
NS_LOG_FUNCTION_NOARGS ();
for (std::vector<Ptr<TcpSocketImpl> >::iterator i = m_sockets.begin (); i != m_sockets.end (); i++)
{
*i = 0;
}
m_sockets.clear ();
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);
m_sockets.push_back (socket);
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);
}
enum Ipv4L4Protocol::RxStatus
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(Node::ChecksumEnabled ())
{
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 Ipv4L4Protocol::RX_CSUM_FAILED;
}
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 ());
if (!(tcpHeader.GetFlags () & TcpHeader::RST))
{
// build a RST packet and send
Ptr<Packet> rstPacket = Create<Packet> ();
TcpHeader header;
if (tcpHeader.GetFlags () & TcpHeader::ACK)
{
// ACK bit was set
header.SetFlags (TcpHeader::RST);
header.SetSequenceNumber (header.GetAckNumber ());
}
else
{
header.SetFlags (TcpHeader::RST | TcpHeader::ACK);
header.SetSequenceNumber (SequenceNumber (0));
header.SetAckNumber (header.GetSequenceNumber () + SequenceNumber (1));
}
header.SetSourcePort (tcpHeader.GetDestinationPort ());
header.SetDestinationPort (tcpHeader.GetSourcePort ());
SendPacket (rstPacket, header, destination, source);
return Ipv4L4Protocol::RX_ENDPOINT_CLOSED;
}
else
{
return Ipv4L4Protocol::RX_ENDPOINT_CLOSED;
}
}
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, destination, tcpHeader.GetSourcePort ());
return Ipv4L4Protocol::RX_OK;
}
void
TcpL4Protocol::Send (Ptr<Packet> packet,
Ipv4Address saddr, Ipv4Address daddr,
uint16_t sport, uint16_t dport, Ptr<NetDevice> oif)
{
NS_LOG_FUNCTION (this << packet << saddr << daddr << sport << dport << oif);
TcpHeader tcpHeader;
tcpHeader.SetDestinationPort (dport);
tcpHeader.SetSourcePort (sport);
if(Node::ChecksumEnabled ())
{
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)
{
// XXX We've already performed the route lookup in TcpSocketImpl
// should be cached.
Ipv4Header header;
header.SetDestination (daddr);
header.SetProtocol (PROT_NUMBER);
Socket::SocketErrno errno_;
Ptr<Ipv4Route> route;
Ptr<NetDevice> oif (0); //specify non-zero if bound to a source address
route = ipv4->GetRoutingProtocol ()->RouteOutput (packet, header, oif, errno_);
ipv4->Send (packet, saddr, daddr, PROT_NUMBER, route);
}
}
void
TcpL4Protocol::SendPacket (Ptr<Packet> packet, const TcpHeader &outgoing,
Ipv4Address saddr, Ipv4Address daddr, Ptr<NetDevice> oif)
{
NS_LOG_LOGIC("TcpL4Protocol " << this
<< " sending seq " << outgoing.GetSequenceNumber()
<< " ack " << outgoing.GetAckNumber()
<< " flags " << std::hex << (int)outgoing.GetFlags() << std::dec
<< " data size " << packet->GetSize());
NS_LOG_FUNCTION (this << packet << saddr << daddr << oif);
// XXX outgoingHeader cannot be logged
TcpHeader outgoingHeader = outgoing;
outgoingHeader.SetLength (5); //header length in units of 32bit words
/* outgoingHeader.SetUrgentPointer (0); //XXX */
if(Node::ChecksumEnabled ())
{
outgoingHeader.EnableChecksums();
}
outgoingHeader.InitializeChecksum(saddr, daddr, PROT_NUMBER);
packet->AddHeader (outgoingHeader);
Ptr<Ipv4L3Protocol> ipv4 =
m_node->GetObject<Ipv4L3Protocol> ();
if (ipv4 != 0)
{
// XXX We've already performed the route lookup in TcpSocketImpl
// should be cached.
Ipv4Header header;
header.SetDestination (daddr);
header.SetProtocol (PROT_NUMBER);
Socket::SocketErrno errno_;
Ptr<Ipv4Route> route;
route = ipv4->GetRoutingProtocol ()->RouteOutput (packet, header, oif, errno_);
ipv4->Send (packet, saddr, daddr, PROT_NUMBER, route);
}
else
NS_FATAL_ERROR("Trying to use Tcp on a node without an Ipv4 interface");
}
}; // namespace ns3
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