dsr-gratuitous-reply-table.h

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/*
 * Copyright (c) 2011 Yufei Cheng
 *
 * 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: Yufei Cheng   <yfcheng@ittc.ku.edu>
 *
 * James P.G. Sterbenz <jpgs@ittc.ku.edu>, director
 * ResiliNets Research Group  https://resilinets.org/
 * 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 DSR_GRATUITOUS_REPLY_TABLE_H
#define DSR_GRATUITOUS_REPLY_TABLE_H
 
#include "ns3/callback.h"
#include "ns3/ipv4-address.h"
#include "ns3/simulator.h"
#include "ns3/timer.h"
 
#include <vector>
 
namespace ns3
{
namespace dsr
{
struct GraReplyEntry
{
    Ipv4Address m_replyTo;   
    Ipv4Address m_hearFrom;  
    Time m_gratReplyHoldoff; 
 
    GraReplyEntry(Ipv4Address t, Ipv4Address f, Time h)
        : m_replyTo(t),
          m_hearFrom(f),
          m_gratReplyHoldoff(h)
    {
    }
};
 
class DsrGraReply : public Object
{
  public:
    static TypeId GetTypeId();
 
    DsrGraReply();
    ~DsrGraReply() override;
 
    void SetGraTableSize(uint32_t g)
    {
        GraReplyTableSize = g;
    }
 
    uint32_t GetGraTableSize() const
    {
        return GraReplyTableSize;
    }
 
    bool AddEntry(GraReplyEntry& graTableEntry);
    bool FindAndUpdate(Ipv4Address replyTo, Ipv4Address replyFrom, Time gratReplyHoldoff);
    void Purge();
 
    void Clear()
    {
        m_graReply.clear();
    }
 
  private:
    std::vector<GraReplyEntry> m_graReply;
    uint32_t GraReplyTableSize;
 
    struct IsExpired
    {
        bool operator()(const GraReplyEntry& b) const
        {
            return (b.m_gratReplyHoldoff < Simulator::Now());
        }
    };
};
} // namespace dsr
} // namespace ns3
 
#endif /* DSR_GRATUITOUS_REPLY_TABLE_H */