bug 247: tcp checksum crashes when enabled.
/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2005 INRIA
*
* 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
*/
#include "ns3/log.h"
#include "ns3/assert.h"
#include "ns3/packet.h"
#include "ns3/node.h"
#include "ns3/boolean.h"
#include "udp-l4-protocol.h"
#include "udp-header.h"
#include "ipv4-end-point-demux.h"
#include "ipv4-end-point.h"
#include "ipv4-l3-protocol.h"
#include "udp-socket-impl.h"
NS_LOG_COMPONENT_DEFINE ("UdpL4Protocol");
namespace ns3 {
NS_OBJECT_ENSURE_REGISTERED (UdpL4Protocol);
/* see http://www.iana.org/assignments/protocol-numbers */
const uint8_t UdpL4Protocol::PROT_NUMBER = 17;
TypeId
UdpL4Protocol::GetTypeId (void)
{
static TypeId tid = TypeId ("ns3::UdpL4Protocol")
.SetParent<Ipv4L4Protocol> ()
.AddConstructor<UdpL4Protocol> ()
.AddAttribute ("CalcChecksum", "If true, we calculate the checksum of outgoing packets"
" and verify the checksum of incoming packets.",
BooleanValue (false),
MakeBooleanAccessor (&UdpL4Protocol::m_calcChecksum),
MakeBooleanChecker ())
;
return tid;
}
UdpL4Protocol::UdpL4Protocol ()
: m_endPoints (new Ipv4EndPointDemux ())
{
NS_LOG_FUNCTION_NOARGS ();
}
UdpL4Protocol::~UdpL4Protocol ()
{
NS_LOG_FUNCTION_NOARGS ();
}
void
UdpL4Protocol::SetNode (Ptr<Node> node)
{
m_node = node;
}
int
UdpL4Protocol::GetProtocolNumber (void) const
{
return PROT_NUMBER;
}
int
UdpL4Protocol::GetVersion (void) const
{
return 2;
}
void
UdpL4Protocol::DoDispose (void)
{
NS_LOG_FUNCTION_NOARGS ();
if (m_endPoints != 0)
{
delete m_endPoints;
m_endPoints = 0;
}
m_node = 0;
Ipv4L4Protocol::DoDispose ();
}
Ptr<Socket>
UdpL4Protocol::CreateSocket (void)
{
NS_LOG_FUNCTION_NOARGS ();
Ptr<UdpSocketImpl> socket = CreateObject<UdpSocketImpl> ();
socket->SetNode (m_node);
socket->SetUdp (this);
return socket;
}
Ipv4EndPoint *
UdpL4Protocol::Allocate (void)
{
NS_LOG_FUNCTION_NOARGS ();
return m_endPoints->Allocate ();
}
Ipv4EndPoint *
UdpL4Protocol::Allocate (Ipv4Address address)
{
NS_LOG_FUNCTION (this << address);
return m_endPoints->Allocate (address);
}
Ipv4EndPoint *
UdpL4Protocol::Allocate (uint16_t port)
{
NS_LOG_FUNCTION (this << port);
return m_endPoints->Allocate (port);
}
Ipv4EndPoint *
UdpL4Protocol::Allocate (Ipv4Address address, uint16_t port)
{
NS_LOG_FUNCTION (this << address << port);
return m_endPoints->Allocate (address, port);
}
Ipv4EndPoint *
UdpL4Protocol::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
UdpL4Protocol::DeAllocate (Ipv4EndPoint *endPoint)
{
NS_LOG_FUNCTION (this << endPoint);
m_endPoints->DeAllocate (endPoint);
}
void
UdpL4Protocol::Receive(Ptr<Packet> packet,
Ipv4Address const &source,
Ipv4Address const &destination,
Ptr<Ipv4Interface> interface)
{
NS_LOG_FUNCTION (this << packet << source << destination);
UdpHeader udpHeader;
if(m_calcChecksum)
{
udpHeader.EnableChecksums();
}
udpHeader.InitializeChecksum (source, destination, PROT_NUMBER);
packet->RemoveHeader (udpHeader);
if(!udpHeader.IsChecksumOk ())
{
NS_LOG_INFO("Bad checksum : dropping packet!");
return;
}
Ipv4EndPointDemux::EndPoints endPoints =
m_endPoints->Lookup (destination, udpHeader.GetDestinationPort (),
source, udpHeader.GetSourcePort (), interface);
for (Ipv4EndPointDemux::EndPointsI endPoint = endPoints.begin ();
endPoint != endPoints.end (); endPoint++)
{
(*endPoint)->ForwardUp (packet->Copy (), source, udpHeader.GetSourcePort ());
}
}
void
UdpL4Protocol::Send (Ptr<Packet> packet,
Ipv4Address saddr, Ipv4Address daddr,
uint16_t sport, uint16_t dport)
{
NS_LOG_FUNCTION (this << packet << saddr << daddr << sport << dport);
UdpHeader udpHeader;
if(m_calcChecksum)
{
udpHeader.EnableChecksums();
udpHeader.InitializeChecksum (saddr,
daddr,
PROT_NUMBER);
}
udpHeader.SetDestinationPort (dport);
udpHeader.SetSourcePort (sport);
packet->AddHeader (udpHeader);
Ptr<Ipv4L3Protocol> ipv4 = m_node->GetObject<Ipv4L3Protocol> ();
if (ipv4 != 0)
{
NS_LOG_LOGIC ("Sending to IP");
ipv4->Send (packet, saddr, daddr, PROT_NUMBER);
}
}
}; // namespace ns3