/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2007-2008 Louis Pasteur University
 *
 * 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: Sebastien Vincent <vincent@clarinet.u-strasbg.fr>
 */

#include "ns3/assert.h"
#include "ns3/log.h"
#include "ns3/header.h"
#include "address-utils.h"
#include "ipv6-header.h"

NS_LOG_COMPONENT_DEFINE ("Ipv6Header");

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (Ipv6Header);

Ipv6Header::Ipv6Header ()
: m_version (6),
  m_trafficClass (0),
  m_flowLabel (1),
  m_payloadLength (0),
  m_nextHeader (0),
  m_hopLimit (0)
{

  SetSourceAddress (Ipv6Address("::"));
  SetDestinationAddress(Ipv6Address ("::"));
}

void Ipv6Header::SetTrafficClass (uint8_t traffic)
{
  m_trafficClass = traffic;
}

uint8_t Ipv6Header::GetTrafficClass () const
{
  return m_trafficClass;
}

void Ipv6Header::SetFlowLabel (uint32_t flow)
{
  m_flowLabel = flow;
}

uint32_t Ipv6Header::GetFlowLabel () const
{
  return m_flowLabel;
}

void Ipv6Header::SetPayloadLength (uint16_t len)
{
  m_payloadLength = len;
}

uint16_t Ipv6Header::GetPayloadLength () const
{
  return m_payloadLength;
}

void Ipv6Header::SetNextHeader (uint8_t next)
{
  m_nextHeader = next;
}

uint8_t Ipv6Header::GetNextHeader () const
{
  return m_nextHeader;
}

void Ipv6Header::SetHopLimit (uint8_t limit)
{
  m_hopLimit = limit;
}

uint8_t Ipv6Header::GetHopLimit () const
{
  return m_hopLimit;
}

void Ipv6Header::SetSourceAddress (Ipv6Address src)
{
  m_sourceAddress = src;
}

Ipv6Address Ipv6Header::GetSourceAddress () const
{
  return m_sourceAddress;
}

void Ipv6Header::SetDestinationAddress (Ipv6Address dst)
{
  m_destinationAddress = dst;
}

Ipv6Address Ipv6Header::GetDestinationAddress () const
{
  return m_destinationAddress;
}

TypeId Ipv6Header::GetTypeId (void)
{
  static TypeId tid = TypeId ("ns3::Ipv6Header")
    .SetParent<Header> ()
    .AddConstructor<Ipv6Header> ()
    ;
  return tid;
}

TypeId Ipv6Header::GetInstanceTypeId (void) const
{
  return GetTypeId ();
}

void Ipv6Header::Print (std::ostream& os) const
{
  os << "("
    "Version " << m_version << " "
    << "Traffic class 0x" << std::hex << m_trafficClass << std::dec << " "
    << "Flow Label 0x" << std::hex << m_flowLabel << std::dec << " "
    << "Payload Length " << m_payloadLength << " "
    << "Next Header " << std::dec << (uint32_t) m_nextHeader << " "
    << "Hop Limit " << std::dec << (uint32_t)m_hopLimit << " )"
    <<  m_sourceAddress << " > " <<  m_destinationAddress
    ;
}

uint32_t Ipv6Header::GetSerializedSize () const
{
  return 10 * 4;
}

void Ipv6Header::Serialize (Buffer::Iterator start) const
{
  Buffer::Iterator i = start;
  uint32_t vTcFl = 0; /* version, Traffic Class and Flow Label fields */

  vTcFl= (6 << 28) | (m_trafficClass << 20) | (m_flowLabel);

  i.WriteHtonU32(vTcFl);
  i.WriteHtonU16(m_payloadLength);
  i.WriteU8(m_nextHeader);
  i.WriteU8(m_hopLimit);

  WriteTo(i, m_sourceAddress);
  WriteTo(i, m_destinationAddress);
}

uint32_t Ipv6Header::Deserialize (Buffer::Iterator start)
{
  Buffer::Iterator i = start;
  uint32_t vTcFl = 0;

  vTcFl = i.ReadNtohU32();
  m_version = vTcFl >> 28;

  NS_ASSERT((m_version) == 6);

  m_trafficClass = (uint8_t)((vTcFl >> 20) & 0x000000ff);
  m_flowLabel = vTcFl & 0xfff00000;
  m_payloadLength = i.ReadNtohU16();
  m_nextHeader = i.ReadU8();
  m_hopLimit = i.ReadU8();

  ReadFrom(i, m_sourceAddress);
  ReadFrom(i, m_destinationAddress);

  return GetSerializedSize();
}

} /* namespace ns3 */