src/internet/model/udp-header.cc
author Adrian S Tam <adrian.sw.tam@gmail.com>
Wed, 07 Dec 2011 11:22:10 -0500
changeset 7619 b4dee6307aa7
parent 7386 2310ed220a61
child 7717 cfa1741013dd
permissions -rw-r--r--
Nagle's algorithm in TCP (closes bug 1039)
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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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 * Copyright (c) 2005 INRIA
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License version 2 as
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 * published by the Free Software Foundation;
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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 */
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#include "udp-header.h"
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#include "ns3/address-utils.h"
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namespace ns3 {
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NS_OBJECT_ENSURE_REGISTERED (UdpHeader);
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/* The magic values below are used only for debugging.
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 * They can be used to easily detect memory corruption
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 * problems so you can see the patterns in memory.
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 */
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UdpHeader::UdpHeader ()
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  : m_sourcePort (0xfffd),
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    m_destinationPort (0xfffd),
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    m_payloadSize (0xfffd),
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    m_calcChecksum (false),
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    m_goodChecksum (true)
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{
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}
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UdpHeader::~UdpHeader ()
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{
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  m_sourcePort = 0xfffe;
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  m_destinationPort = 0xfffe;
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  m_payloadSize = 0xfffe;
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}
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void 
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UdpHeader::EnableChecksums (void)
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{
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  m_calcChecksum = true;
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}
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void 
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UdpHeader::SetDestinationPort (uint16_t port)
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{
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  m_destinationPort = port;
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}
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void 
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UdpHeader::SetSourcePort (uint16_t port)
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{
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  m_sourcePort = port;
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}
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uint16_t 
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UdpHeader::GetSourcePort (void) const
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{
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  return m_sourcePort;
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}
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uint16_t 
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UdpHeader::GetDestinationPort (void) const
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{
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  return m_destinationPort;
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}
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void 
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UdpHeader::InitializeChecksum (Ipv4Address source, 
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                               Ipv4Address destination,
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                               uint8_t protocol)
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{
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  m_source = source;
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  m_destination = destination;
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  m_protocol = protocol;
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}
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uint16_t
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UdpHeader::CalculateHeaderChecksum (uint16_t size) const
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{
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  Buffer buf = Buffer (12);
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  buf.AddAtStart (12);
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  Buffer::Iterator it = buf.Begin ();
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  WriteTo (it, m_source);
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  WriteTo (it, m_destination);
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  it.WriteU8 (0); /* protocol */
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  it.WriteU8 (m_protocol); /* protocol */
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  it.WriteU8 (size >> 8); /* length */
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  it.WriteU8 (size & 0xff); /* length */
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  it = buf.Begin ();
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  /* we don't CompleteChecksum ( ~ ) now */
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  return ~(it.CalculateIpChecksum (12));
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}
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bool
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UdpHeader::IsChecksumOk (void) const
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{
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  return m_goodChecksum; 
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}
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TypeId 
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UdpHeader::GetTypeId (void)
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{
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  static TypeId tid = TypeId ("ns3::UdpHeader")
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    .SetParent<Header> ()
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    .AddConstructor<UdpHeader> ()
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  ;
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  return tid;
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}
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TypeId 
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UdpHeader::GetInstanceTypeId (void) const
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{
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  return GetTypeId ();
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}
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void 
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UdpHeader::Print (std::ostream &os) const
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{
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  os << "length: " << m_payloadSize + GetSerializedSize ()
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     << " " 
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     << m_sourcePort << " > " << m_destinationPort
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  ;
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}
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uint32_t 
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UdpHeader::GetSerializedSize (void) const
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{
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  return 8;
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}
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void
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UdpHeader::Serialize (Buffer::Iterator start) const
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{
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  Buffer::Iterator i = start;
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  i.WriteHtonU16 (m_sourcePort);
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  i.WriteHtonU16 (m_destinationPort);
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  i.WriteHtonU16 (start.GetSize ());
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  i.WriteU16 (0);
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  if (m_calcChecksum)
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    {
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      uint16_t headerChecksum = CalculateHeaderChecksum (start.GetSize ());
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      i = start;
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      uint16_t checksum = i.CalculateIpChecksum (start.GetSize (), headerChecksum);
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      i = start;
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      i.Next (6);
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      i.WriteU16 (checksum);
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    }
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}
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uint32_t
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UdpHeader::Deserialize (Buffer::Iterator start)
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{
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  Buffer::Iterator i = start;
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  m_sourcePort = i.ReadNtohU16 ();
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  m_destinationPort = i.ReadNtohU16 ();
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  m_payloadSize = i.ReadNtohU16 () - GetSerializedSize ();
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  i.Next (2);
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  if(m_calcChecksum)
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    {
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      uint16_t headerChecksum = CalculateHeaderChecksum (start.GetSize ());
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      i = start;
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      uint16_t checksum = i.CalculateIpChecksum (start.GetSize (), headerChecksum);
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      m_goodChecksum = (checksum == 0);
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    }
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  return GetSerializedSize ();
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}
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} // namespace ns3