/* -*- Mode: C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2007-2009 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, MA02111-1307USA
 *
 * Author: David Gross <gdavid.devel@gmail.com>
 */

#ifndef IPV6_OPTION_H
#define IPV6_OPTION_H

#include <map>

#include "ns3/object.h"
#include "ns3/node.h"
#include "ns3/ptr.h"
#include "ipv6-interface.h"
#include "ns3/ipv6-header.h"
#include "ns3/buffer.h"
#include "ns3/packet.h"
#include "ns3/ipv6-address.h"

namespace ns3
{

/**
 * \class Ipv6Option
 * \brief IPv6 Option base
 * 
 * If you want to implement a new IPv6 option, all you have to do is
 * implement a subclass of this class and add it to an Ipv6OptionDemux.
 */
class Ipv6Option : public Object
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6Option ();

  /**
   * \brief Set the node.
   * \param node the node to set
   */
  void SetNode (Ptr<Node> node);

  /**
   * \brief Get the option number.
   * \return option number
   */
  virtual uint8_t GetOptionNumber () const = 0;

  /**
   * \brief Process method
   *
   * Called from Ipv6L3Protocol::Receive.
   * \param packet the packet
   * \param offset the offset of the extension to process
   * \param ipv6Header the IPv6 header of packet received
   * \param isDropped if the packet must be dropped
   * \return the processed size
   */
  virtual uint8_t Process (Ptr<Packet> packet, uint8_t offset, Ipv6Header const& ipv6Header, bool& isDropped) = 0;

private:
  /**
   * \brief The node.
   */
  Ptr<Node> m_node;
};

/**
 * \class Ipv6OptionPad1
 * \brief IPv6 Option Pad1
 */
class Ipv6OptionPad1 : public Ipv6Option
{
public:
  /**
   * \brief Pad1 option number.
   */
  static const uint8_t OPT_NUMBER = 0;

  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Constructor.
   */
  Ipv6OptionPad1 ();

  /**
   * \brief Destructor.
   */
  ~Ipv6OptionPad1 ();

  /**
   * \brief Get the option number.
   * \return option number
   */
  virtual uint8_t GetOptionNumber () const;

  /**
   * \brief Process method
   *
   * Called from Ipv6L3Protocol::Receive.
   * \param packet the packet
   * \param offset the offset of the extension to process
   * \param ipv6Header the IPv6 header of packet received
   * \param isDropped if the packet must be dropped
   * \return the processed size
   */
  virtual uint8_t Process (Ptr<Packet> packet, uint8_t offset, Ipv6Header const& ipv6Header, bool& isDropped);
};

/**
 * \class Ipv6OptionPadn
 * \brief IPv6 Option Padn
 */
class Ipv6OptionPadn : public Ipv6Option
{
public:
  /**
   * \brief PadN option number.
   */
  static const uint8_t OPT_NUMBER = 60;

  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Constructor.
   */
  Ipv6OptionPadn ();

  /**
   * \brief Destructor.
   */
  ~Ipv6OptionPadn ();

  /**
   * \brief Get the option number.
   * \return option number
   */
  virtual uint8_t GetOptionNumber () const;

  /**
   * \brief Process method
   *
   * Called from Ipv6L3Protocol::Receive.
   * \param packet the packet
   * \param offset the offset of the extension to process
   * \param ipv6Header the IPv6 header of packet received
   * \param isDropped if the packet must be dropped
   * \return the processed size
   */
  virtual uint8_t Process (Ptr<Packet> packet, uint8_t offset, Ipv6Header const& ipv6Header, bool& isDropped);
};

/**
 * \class Ipv6OptionJumbogram
 * \brief IPv6 Option Jumbogram
 */
class Ipv6OptionJumbogram : public Ipv6Option
{
public:
  /**
   * \brief Jumbogram option number.
   */
  static const uint8_t OPT_NUMBER = 44;

  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Constructor.
   */
  Ipv6OptionJumbogram ();

  /**
   * \brief Destructor.
   */
  ~Ipv6OptionJumbogram ();

  /**
   * \brief Get the option number.
   * \return option number
   */
  virtual uint8_t GetOptionNumber () const;

  /**
   * \brief Process method
   * Called from Ipv6L3Protocol::Receive.
   * \param packet the packet
   * \param offset the offset of the extension to process
   * \param ipv6Header the IPv6 header of packet received
   * \param isDropped if the packet must be dropped
   * \return the processed size
   */
  virtual uint8_t Process (Ptr<Packet> packet, uint8_t offset, Ipv6Header const& ipv6Header, bool& isDropped);

private:
  /**
   * \brief The length of the packet.
   */
  uint32_t m_length;
};

/**
 * \class Ipv6OptionRouterAlert
 * \brief IPv6 Option Router Alert
 */
class Ipv6OptionRouterAlert : public Ipv6Option
{
public:
  /**
   * \brief Router alert option number.
   */
  static const uint8_t OPT_NUMBER = 43;

  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Constructor.
   */
  Ipv6OptionRouterAlert ();

  /**
   * \brief Destructor.
   */
  ~Ipv6OptionRouterAlert ();

  /**
   * \brief Get the option number.
   * \return option number
   */
  virtual uint8_t GetOptionNumber () const;

  /**
   * \brief Process method
   *
   * Called from Ipv6L3Protocol::Receive.
   * \param packet the packet
   * \param offset the offset of the extension to process
   * \param ipv6Header the IPv6 header of packet received
   * \param isDropped if the packet must be dropped
   * \return the processed size
   */
  virtual uint8_t Process (Ptr<Packet> packet, uint8_t offset, Ipv6Header const& ipv6Header, bool& isDropped);
};

} /* namespace ns3 */

#endif /* IPV6_OPTION_H */