aodv-dpd.h

Go to the documentation of this file.

/*
 * Copyright (c) 2009 IITP RAS
 *
 * 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
 *
 *
 * Authors: Elena Buchatskaia <borovkovaes@iitp.ru>
 *          Pavel Boyko <boyko@iitp.ru>
 */
 
#ifndef AODV_DPD_H
#define AODV_DPD_H
 
#include "aodv-id-cache.h"
 
#include "ns3/ipv4-header.h"
#include "ns3/nstime.h"
#include "ns3/packet.h"
 
namespace ns3
{
namespace aodv
{
/**
 * \ingroup aodv
 *
 * \brief Helper class used to remember already seen packets and detect duplicates.
 *
 * Currently duplicate detection is based on unique packet ID given by Packet::GetUid ()
 * This approach is known to be weak (ns3::Packet UID is an internal identifier and not intended for
 * logical uniqueness in models) and should be changed.
 */
class DuplicatePacketDetection
{
  public:
    /**
     * Constructor
     * \param lifetime the lifetime for added entries
     */
    DuplicatePacketDetection(Time lifetime)
        : m_idCache(lifetime)
    {
    }
 
    /**
     * Check if the packet is a duplicate. If not, save information about this packet.
     * \param p the packet to check
     * \param header the IP header to check
     * \returns true if duplicate
     */
    bool IsDuplicate(Ptr<const Packet> p, const Ipv4Header& header);
    /**
     * Set duplicate record lifetime
     * \param lifetime the lifetime for duplicate records
     */
    void SetLifetime(Time lifetime);
    /**
     * Get duplicate record lifetime
     * \returns the duplicate record lifetime
     */
    Time GetLifetime() const;
 
  private:
    /// Impl
    IdCache m_idCache;
};
 
} // namespace aodv
} // namespace ns3
 
#endif /* AODV_DPD_H */