dsdv-packet-queue.h

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2010 Hemanth Narra
 *
 * 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: Hemanth Narra <hemanth@ittc.ku.com>
 *
 * James P.G. Sterbenz <jpgs@ittc.ku.edu>, director
 * ResiliNets Research Group  http://wiki.ittc.ku.edu/resilinets
 * Information and Telecommunication Technology Center (ITTC)
 * and Department of Electrical Engineering and Computer Science
 * The University of Kansas Lawrence, KS USA.
 *
 * Work supported in part by NSF FIND (Future Internet Design) Program
 * under grant CNS-0626918 (Postmodern Internet Architecture),
 * NSF grant CNS-1050226 (Multilayer Network Resilience Analysis and Experimentation on GENI),
 * US Department of Defense (DoD), and ITTC at The University of Kansas.
 */

#ifndef DSDV_PACKETQUEUE_H
#define DSDV_PACKETQUEUE_H

#include <vector>
#include "ns3/ipv4-routing-protocol.h"
#include "ns3/simulator.h"

namespace ns3 {
namespace dsdv {
class QueueEntry
{
public:
  typedef Ipv4RoutingProtocol::UnicastForwardCallback UnicastForwardCallback;
  typedef Ipv4RoutingProtocol::ErrorCallback ErrorCallback;
  QueueEntry (Ptr<const Packet> pa = 0, Ipv4Header const & h = Ipv4Header (),
              UnicastForwardCallback ucb = UnicastForwardCallback (),
              ErrorCallback ecb = ErrorCallback ())
    : m_packet (pa),
      m_header (h),
      m_ucb (ucb),
      m_ecb (ecb),
      m_expire (Seconds (0))
  {
  }

  bool operator== (QueueEntry const & o) const
  {
    return ((m_packet == o.m_packet) && (m_header.GetDestination () == o.m_header.GetDestination ()) && (m_expire == o.m_expire));
  }

  // Fields
  UnicastForwardCallback GetUnicastForwardCallback () const
  {
    return m_ucb;
  }
  void SetUnicastForwardCallback (UnicastForwardCallback ucb)
  {
    m_ucb = ucb;
  }
  ErrorCallback GetErrorCallback () const
  {
    return m_ecb;
  }
  void SetErrorCallback (ErrorCallback ecb)
  {
    m_ecb = ecb;
  }
  Ptr<const Packet> GetPacket () const
  {
    return m_packet;
  }
  void SetPacket (Ptr<const Packet> p)
  {
    m_packet = p;
  }
  Ipv4Header GetIpv4Header () const
  {
    return m_header;
  }
  void SetIpv4Header (Ipv4Header h)
  {
    m_header = h;
  }
  void SetExpireTime (Time exp)
  {
    m_expire = exp + Simulator::Now ();
  }
  Time GetExpireTime () const
  {
    return m_expire - Simulator::Now ();
  }

private:
  Ptr<const Packet> m_packet;
  Ipv4Header m_header;
  UnicastForwardCallback m_ucb;
  ErrorCallback m_ecb;
  Time m_expire;
};
class PacketQueue
{
public:
  PacketQueue ()
  {
  }
  bool Enqueue (QueueEntry & entry);
  bool Dequeue (Ipv4Address dst, QueueEntry & entry);
  void DropPacketWithDst (Ipv4Address dst);
  bool Find (Ipv4Address dst);
  uint32_t
  GetCountForPacketsWithDst (Ipv4Address dst);
  uint32_t GetSize ();

  // Fields
  uint32_t GetMaxQueueLen () const
  {
    return m_maxLen;
  }
  void SetMaxQueueLen (uint32_t len)
  {
    m_maxLen = len;
  }
  uint32_t GetMaxPacketsPerDst () const
  {
    return m_maxLenPerDst;
  }
  void SetMaxPacketsPerDst (uint32_t len)
  {
    m_maxLenPerDst = len;
  }
  Time GetQueueTimeout () const
  {
    return m_queueTimeout;
  }
  void SetQueueTimeout (Time t)
  {
    m_queueTimeout = t;
  }

private:
  std::vector<QueueEntry> m_queue; 
  void Purge ();
  void Drop (QueueEntry en, std::string reason);
  uint32_t m_maxLen;
  uint32_t m_maxLenPerDst;
  Time m_queueTimeout;
  static bool IsEqual (QueueEntry en, const Ipv4Address dst)
  {
    return (en.GetIpv4Header ().GetDestination () == dst);
  }
};
}
}
#endif /* DSDV_PACKETQUEUE_H */