1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

     2 /*

     3  * Copyright (c) 2009 IITP RAS

     4  *

     5  * This program is free software; you can redistribute it and/or modify

     6  * it under the terms of the GNU General Public License version 2 as

     7  * published by the Free Software Foundation;

     8  *

     9  * This program is distributed in the hope that it will be useful,

    10  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12  * GNU General Public License for more details.

    13  *

    14  * You should have received a copy of the GNU General Public License

    15  * along with this program; if not, write to the Free Software

    16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    17  *

    18  *

    19  * Authors: Elena Buchatskaia <borovkovaes@iitp.ru>

    20  *          Pavel Boyko <boyko@iitp.ru>

    21  */

    22 

    23 #ifndef DUPLICATEPACKETDETECTION_H_

    24 #define DUPLICATEPACKETDETECTION_H_

    25 

    26 #include "aodv-id-cache.h"

    27 #include "ns3/nstime.h"

    28 #include "ns3/packet.h"

    29 #include "ns3/ipv4-header.h"

    30 

    31 namespace ns3

    32 {

    33 namespace aodv

    34 {

    35 /**

    36  * \ingroup aodv

    37  * 

    38  * \brief Helper class used to remember already seen packets and detect duplicates.

    39  *

    40  * Currently duplicate detection is based on uinique packet ID given by Packet::GetUid ()

    41  * This approach is known to be weak and should be changed.

    42  */

    43 class DuplicatePacketDetection

    44 {

    45 public:

    46   /// C-tor

    47   DuplicatePacketDetection (Time lifetime) : m_idCache(lifetime) {}

    48   /// Check that the packet is duplicated. If not, save information about this packet.

    49   bool IsDuplicate (Ptr<const Packet> p, const Ipv4Header & header);

    50   /// Set duplicate records lifetimes

    51   void SetLifetime (Time lifetime);

    52   /// Get duplicate records lifetimes

    53   Time GetLifetime () const;

    54 private:

    55   /// Impl

    56   IdCache m_idCache;

    57 };

    58 

    59 }

    60 }

    61 

    62 #endif