/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2008-2009 Strasbourg 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: David Gross <gdavid.devel@gmail.com>
 */

#ifndef IPV6_EXTENSION_HEADER_H
#define IPV6_EXTENSION_HEADER_H

#include <vector>
#include <list>
#include <ostream>

#include "ns3/header.h"
#include "ns3/ipv6-address.h"
#include "ipv6-option-header.h"

namespace ns3
{

/**
 * \class Ipv6ExtensionHeader
 * \brief Header for IPv6 Extension.
 */
class Ipv6ExtensionHeader : public Header 
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6ExtensionHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6ExtensionHeader ();

  /**
   * \brief Set the "Next header" field.
   * \param nextHeader the next header number
   */
  void SetNextHeader (uint8_t nextHeader);

  /**
   * \brief Get the next header.
   * \return the next header number
   */
  uint8_t GetNextHeader () const;

  /**
   * brief Set the length of the extension.
   * \param length the length of the extension in bytes
   */
  void SetLength (uint16_t length);

  /**
   * \brief Get the length of the extension.
   * \return the length of the extension
   */
  uint16_t GetLength () const;

  /**
   * \brief Print some informations about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);

private:
  /**
   * \brief The "next header" field.
   */
  uint8_t m_nextHeader;

  /**
   * \brief The "length" field.
   */
  uint8_t m_length;

  /**
   * \brief The data of the extension.
   */
  Buffer m_data;
};

/**
 * \class OptionField
 * \brief Option field for an IPv6ExtensionHeader
 * Enables adding options to an IPv6ExtensionHeader
 *
 * Implementor's note: Make sure to add the result of
 * OptionField::GetSerializedSize () to your IPv6ExtensionHeader::GetSerializedSize ()
 * return value. Call OptionField::Serialize and OptionField::Deserialize at the
 * end of your corresponding IPv6ExtensionHeader methods.
 */
class OptionField
{
public:
  /**
   * \brief Constructor.
   * \param optionsOffset option offset
   */
  OptionField (uint32_t optionsOffset);

  /**
   * \brief Destructor.
   */
  ~OptionField ();

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize all added options.
   * \param start Buffer iterator
   */
  void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \param length length
   * \return size of the packet
   */
  uint32_t Deserialize (Buffer::Iterator start, uint32_t length);

  /**
   * \brief Serialize the option, prepending pad1 or padn option as necessary
   * \param option the option header to serialize
   */
  void AddOption (Ipv6OptionHeader const& option);

  /**
   * \brief Get the offset where the options begin, measured from the start of
   * the extension header.
   * \return the offset from the start of the extension header
   */
  uint32_t GetOptionsOffset ();

  /**
   * \brief Get the buffer.
   * \return buffer
   */
  Buffer GetOptionBuffer ();

private:

  /**
   * \brief Calculate padding.
   * \param alignment alignment
   * \return the number of pad bytes
   */
  uint32_t CalculatePad (Ipv6OptionHeader::Alignment alignment) const;

  /**
   * \brief Data payload.
   */
  Buffer m_optionData;

  /**
   * \brief Offset.
   */
  uint32_t m_optionsOffset;
};

/**
 * \class Ipv6ExtensionHopByHopHeader
 * \brief Header of IPv6 Extension "Hop by Hop"
 */
class Ipv6ExtensionHopByHopHeader : public Ipv6ExtensionHeader, public OptionField
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6ExtensionHopByHopHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6ExtensionHopByHopHeader ();

  /**
   * \brief Print some informations about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);
};

/**
 * \class Ipv6ExtensionDestinationHeader
 * \brief Header of IPv6 Extension Destination
 */
class Ipv6ExtensionDestinationHeader : public Ipv6ExtensionHeader, public OptionField
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6ExtensionDestinationHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6ExtensionDestinationHeader ();

  /**
   * \brief Print some informations about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);
};

/**
 * \class Ipv6ExtensionFragmentHeader
 * \brief Header of IPv6 Extension Fragment
 */
class Ipv6ExtensionFragmentHeader : public Ipv6ExtensionHeader
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6ExtensionFragmentHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6ExtensionFragmentHeader ();

  /**
   * \brief Set the "Offset" field.
   * \param offset the offset of the fragment
   */
  void SetOffset (uint16_t offset);

  /**
   * \brief Get the field "Offset".
   * \return the offset of the fragment
   */
  uint16_t GetOffset () const;

  /**
   * \brief Set the status of "More Fragment" bit.
   * \param moreFragment the bit "More Fragment"
   */
  void SetMoreFragment (bool moreFragment);

  /**
   * \brief Get the status of "More Fragment" bit.
   * \return the status of "More Fragment" bit.
   */
  bool GetMoreFragment () const;

  /**
   * \brief Set the "Identification" field.
   * \param identification the identifier of the fragment
   */
  void SetIdentification (uint32_t identification);

  /**
   * \brief Get the field "Identification".
   * \return the identifier of the fragment
   */
  uint32_t GetIdentification () const;

  /**
   * \brief Print some informations about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);

private:
  /**
   * \brief Offset of the fragment and More Fragment bit.
   */
  uint16_t m_offset;

  /**
   * \brief Identifier of the packet.
   */
  uint32_t m_identification;
};

/**
 * \class Ipv6ExtensionRoutingHeader
 * \brief Header of IPv6 Extension Routing
 */
class Ipv6ExtensionRoutingHeader : public Ipv6ExtensionHeader
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6ExtensionRoutingHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6ExtensionRoutingHeader ();

  /**
   * \brief Set the "Type of Routing" field.
   * \param typeRouting the type of routing
   */
  void SetTypeRouting (uint8_t typeRouting);

  /**
   * \brief Get the field "Type of Routing".
   * \return the type of routing
   */
  uint8_t GetTypeRouting () const;

  /**
   * \brief Set the "Segments left" field.
   * \param segmentsLeft the number of segments left
   */
  void SetSegmentsLeft (uint8_t segmentsLeft);

  /**
   * \brief Get the field "Segments left".
   * \return the number of segments left
   */
  uint8_t GetSegmentsLeft () const;

  /**
   * \brief Print some informations about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);

private:
  /**
   * \brief Type of routing.
   */
  uint8_t m_typeRouting;

  /**
   * \brief Number of left segments.
   */
  uint8_t m_segmentsLeft;
};

/**
 * \class Ipv6ExtensionLooseRoutingHeader
 * \brief Header of IPv6 Extension Routing : Type 0 (Loose Routing)
 */
class Ipv6ExtensionLooseRoutingHeader : public Ipv6ExtensionRoutingHeader
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6ExtensionLooseRoutingHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6ExtensionLooseRoutingHeader ();

  /**
   * \brief Set the number of routers' address.
   * \param n the number of routers' address
   */
  void SetNumberAddress (uint8_t n);

  /**
   * \brief Set the vector of routers' address
   * \param routersAddress the vector of routers's address
   */
  void SetRoutersAddress (std::vector<Ipv6Address> routersAddress);

  /**
   * \brief Get the vector of routers' address
   * \return the vector of routers' address
   */
  std::vector<Ipv6Address> GetRoutersAddress () const;

  /**
   * \brief Set a Router IPv6 Address.
   * \param index the index of the IPv6 Address
   * \param addr the new IPv6 Address
   */
  void SetRouterAddress (uint8_t index, Ipv6Address addr);

  /**
   * \brief Get a Router IPv6 Address.
   * \param index the index of the IPv6 Address
   * \return the router IPv6 Address 
   */
  Ipv6Address GetRouterAddress (uint8_t index) const;

  /**
   * \brief Print some informations about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);

private:
  /**
   * \brief A vector of IPv6 Address.
   */
  typedef std::vector<Ipv6Address> VectorIpv6Address_t;

  /**
   * \brief The vector of Routers' IPv6 Address.
   */
  VectorIpv6Address_t m_routersAddress;
};

/**
 * \class Ipv6ExtensionESPHeader
 * \brief Header of IPv6 Extension ESP
 */
class Ipv6ExtensionESPHeader : public Ipv6ExtensionHeader
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6ExtensionESPHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6ExtensionESPHeader ();

  /**
   * \brief Print some informations about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);
};

/**
 * \class Ipv6ExtensionAHHeader
 * \brief Header of IPv6 Extension AH
 */
class Ipv6ExtensionAHHeader : public Ipv6ExtensionHeader
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6ExtensionAHHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6ExtensionAHHeader ();

  /**
   * \brief Print some informations about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);
};

} // namespace ns3

#endif /* IPV6_EXTENSION_HEADER_H */

