/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2009 University of Washington
 *
 * 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
 *
 */
#ifndef IPV4_ROUTE_H
#define IPV4_ROUTE_H

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

#include "ns3/simple-ref-count.h"
#include "ipv4-address.h"

namespace ns3 {

class NetDevice;

/**
 * \ingroup ipv4Routing
 *
 *\brief Ipv4 route cache entry (similar to Linux struct rtable)
 *
 * This is a reference counted object.  In the future, we will add other 
 * entries from struct dst_entry, struct rtable, and struct dst_ops as needed.
 */
class Ipv4Route : public SimpleRefCount<Ipv4Route> 
{
public:
  Ipv4Route ();

  /**
   * \param dest Destination Ipv4Address
   */
  void SetDestination (Ipv4Address dest);
  /**
   * \return Destination Ipv4Address of the route
   */
  Ipv4Address GetDestination (void) const;

  /**
   * \param src Source Ipv4Address
   */
  void SetSource (Ipv4Address src);
  /**
   * \return Source Ipv4Address of the route
   */
  Ipv4Address GetSource (void) const;

  /**
   * \param gw Gateway (next hop) Ipv4Address
   */
  void SetGateway (Ipv4Address gw);
  /**
   * \return Ipv4Address of the gateway (next hop) 
   */
  Ipv4Address GetGateway (void) const;

  /**
   * Equivalent in Linux to dst_entry.dev
   *
   * \param outputDevice pointer to NetDevice for outgoing packets
   */
  void SetOutputDevice (Ptr<NetDevice> outputDevice);
  /**
   * \return pointer to NetDevice for outgoing packets
   */
  Ptr<NetDevice> GetOutputDevice (void) const;

#ifdef NOTYET
  // rtable.idev
  void SetInputIfIndex (uint32_t iif);
  uint32_t GetInputIfIndex (void) const;
#endif

private:
  Ipv4Address m_dest;
  Ipv4Address m_source;
  Ipv4Address m_gateway;
  Ptr<NetDevice> m_outputDevice;
#ifdef NOTYET
  uint32_t m_inputIfIndex;
#endif
};

std::ostream& operator<< (std::ostream& os, Ipv4Route const& route);

/**
 * \ingroup ipv4Routing
 * 
 * \brief Ipv4 multicast route cache entry (similar to Linux struct mfc_cache)
 */
class Ipv4MulticastRoute : public SimpleRefCount<Ipv4MulticastRoute> 
{
public:
  Ipv4MulticastRoute ();

  /**
   * \param group Ipv4Address of the multicast group
   */
  void SetGroup (const Ipv4Address group);
  /**
   * \return Ipv4Address of the multicast group
   */
  Ipv4Address GetGroup (void) const; 

  /**
   * \param origin Ipv4Address of the origin address
   */
  void SetOrigin (const Ipv4Address origin);
  /**
   * \return Ipv4Address of the origin address
   */
  Ipv4Address GetOrigin (void) const; 
  
  /**
   * \param iif Parent (input interface) for this route
   */
  void SetParent (uint32_t iif);
  /**
   * \return Parent (input interface) for this route
   */
  uint32_t GetParent (void) const;

  /**
   * \param oif Outgoing interface index
   * \param ttl time-to-live for this route
   */
  void SetOutputTtl (uint32_t oif, uint32_t ttl);
  /**
   * \param oif outgoing interface
   * \return TTL for this route
   */
  uint32_t GetOutputTtl (uint32_t oif) const;
  
  static const uint32_t MAX_INTERFACES = 16;  // Maximum number of multicast interfaces on a router
  static const uint32_t MAX_TTL = 255;  // Maximum time-to-live (TTL)

private:
  Ipv4Address m_group;      // Group 
  Ipv4Address m_origin;     // Source of packet
  uint32_t m_parent;        // Source interface
  std::vector<uint32_t> m_ttls;
};

}//namespace ns3

#endif /* IPV4_ROUTE_H */
