/* -*-  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 */