/* -*- 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, MA  02111-1307  USA

 *

 * Author: Sebastien Vincent <vincent@clarinet.u-strasbg.fr>

 */

#ifndef IPV6_RAW_SOCKET_IMPL_H

#define IPV6_RAW_SOCKET_IMPL_H

#include <list>

#include "ns3/socket.h"

#include "ns3/ipv6-address.h"

#include "ns3/ipv6-header.h"

namespace ns3

{

class NetDevice;

class Node;

/**

 * \class Ipv6RawSocketImpl

 * \brief IPv6 raw socket.

 *

 * A RAW Socket typically is used to access specific IP layers not usually

 * available through L4 sockets, e.g., ICMP. The implementer should take

 * particular care to define the Ipv6RawSocketImpl Attributes, and in

 * particular the Protocol attribute.

 * Not setting it will result in a zero protocol at IP level (corresponding

 * to the HopByHop IPv6 Extension header, i.e., Ipv6ExtensionHopByHopHeader)

 * when sending data through the socket, which is probably not the intended

 * behavior.

 *

 * A correct example is (from src/applications/model/radvd.cc):

 * \code

   if (!m_socket)

     {

       TypeId tid = TypeId::LookupByName ("ns3::Ipv6RawSocketFactory");

       m_socket = Socket::CreateSocket (GetNode (), tid);

       NS_ASSERT (m_socket);

       m_socket->SetAttribute ("Protocol", UintegerValue(Ipv6Header::IPV6_ICMPV6));

       m_socket->SetRecvCallback (MakeCallback (&Radvd::HandleRead, this));

     }

 * \endcode

 *

 */

class Ipv6RawSocketImpl : public Socket

{

public:

  /**

   * \brief Get the type ID of this class.

   * \return type ID

   */

  static TypeId GetTypeId ();

  Ipv6RawSocketImpl ();

  virtual ~Ipv6RawSocketImpl ();

  /**

   * \param node node to set

   */

  void SetNode (Ptr<Node> node);

  virtual enum Socket::SocketErrno GetErrno () const;

  /**

   * \brief Get socket type (NS3_SOCK_RAW)

   * \return socket type

   */

  virtual enum Socket::SocketType GetSocketType () const;

  virtual Ptr<Node> GetNode () const;

  virtual int Bind (const Address& address);

  virtual int Bind ();

  virtual int Bind6 ();

  virtual int GetSockName (Address& address) const;

  virtual int Close ();

  virtual int ShutdownSend ();

  virtual int ShutdownRecv ();

  virtual int Connect (const Address& address);

  virtual int Listen ();

  virtual uint32_t GetTxAvailable () const;

  virtual uint32_t GetRxAvailable () const;

  virtual int Send (Ptr<Packet> p, uint32_t flags);

  virtual int SendTo (Ptr<Packet> p, uint32_t flags, const Address& toAddress);

  virtual Ptr<Packet> Recv (uint32_t maxSize, uint32_t flags);

  virtual Ptr<Packet> RecvFrom (uint32_t maxSize, uint32_t flags, Address& fromAddress);

  /**

   * \brief Set protocol field.

   * \param protocol protocol to set

   */

  void SetProtocol (uint16_t protocol);

  /**

   * \brief Forward up to receive method.

   * \param p packet

   * \param hdr IPv6 header

   * \param device device

   * \return true if forwarded, false otherwise

   */

  bool ForwardUp (Ptr<const Packet> p, Ipv6Header hdr, Ptr<NetDevice> device);

  virtual bool SetAllowBroadcast (bool allowBroadcast);

  virtual bool GetAllowBroadcast () const;

  /**

   * \brief Clean the ICMPv6 filter structure

   */

  void Icmpv6FilterSetPassAll();

  /**

   * \brief Set the filter to block all the ICMPv6 types

   */

  void Icmpv6FilterSetBlockAll();

  /**

   * \brief Set the filter to pass one ICMPv6 type

   * \param type the ICMPv6 type to pass

   */

  void Icmpv6FilterSetPass(uint8_t type);

  /**

   * \brief Set the filter to block one ICMPv6 type

   * \param type the ICMPv6 type to block

   */

  void Icmpv6FilterSetBlock(uint8_t type);

  /**

   * \brief Ask the filter about the status of one ICMPv6 type

   * \param type the ICMPv6 type

   * \return true if the ICMP type is passing through

   */

  bool Icmpv6FilterWillPass(uint8_t type);

  /**

   * \brief Ask the filter about the status of one ICMPv6 type

   * \param type the ICMPv6 type

   * \return true if the ICMP type is being blocked

   */

  bool Icmpv6FilterWillBlock(uint8_t type);

private:

  /**

   * \struct Data

   * \brief IPv6 raw data and additional information.

   */

  struct Data

  {

    Ptr<Packet> packet;   /**< Packet data */

    Ipv6Address fromIp;   /**< Source address */

    uint16_t fromProtocol;   /**< Protocol used */

  };

  /**

   * \brief Dispose object.

   */

  virtual void DoDispose ();

  /**

   * \brief Last error number.

   */

  enum Socket::SocketErrno m_err;

  /**

   * \brief Node.

   */

  Ptr<Node> m_node;

  /**

   * \brief Source address.

   */

  Ipv6Address m_src;

  /**

   * \brief Destination address.

   */

  Ipv6Address m_dst;

  /**

   * \brief Protocol.

   */

  uint16_t m_protocol;

  /**

   * \brief Packet waiting to be processed.

   */

  std::list<struct Data> m_data;

  /**

   * \brief Flag to shutdown send capability.

   */

  bool m_shutdownSend;

  /**

   * \brief Flag to shutdown receive capability.

   */

  bool m_shutdownRecv;

  /**

   * \brief Struct to hold the ICMPv6 filter

   */

  typedef struct

  {

    uint32_t icmpv6Filt[8]; //!< ICMPv6 filter specification

  } icmpv6Filter;

  /**

   * \brief ICMPv6 filter.

   */

  icmpv6Filter m_icmpFilter;

};

} /* namespace ns3 */

#endif /* IPV6_RAW_SOCKET_IMPL_H */