111 lines
2.9 KiB
C++
111 lines
2.9 KiB
C++
/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
|
|
/*
|
|
* Copyright (c) 2007 Emmanuelle Laprise
|
|
* All rights reserved.
|
|
*
|
|
* 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: Emmanuelle Laprise <emmanuelle.laprise@bluekazoo.ca>
|
|
*/
|
|
|
|
#ifndef ETHERNET_TRAILER_H
|
|
#define ETHERNET_TRAILER_H
|
|
|
|
#include "ns3/trailer.h"
|
|
#include <string>
|
|
|
|
namespace ns3 {
|
|
|
|
class Packet;
|
|
|
|
/**
|
|
* \brief Packet trailer for Ethernet
|
|
*
|
|
* This class can be used to add and verify the FCS at the end of an
|
|
* ethernet packet. The actual FCS functionality is not yet coded and
|
|
* so this acts more as a placeholder.
|
|
*/
|
|
class EthernetTrailer : public Trailer
|
|
{
|
|
public:
|
|
static uint32_t GetUid (void);
|
|
|
|
/**
|
|
* \brief Construct a null ethernet trailer
|
|
*/
|
|
EthernetTrailer ();
|
|
|
|
/**
|
|
* \brief Enable or disabled FCS checking and calculations
|
|
* \param enable If true, enables FCS calculations.
|
|
*/
|
|
static void EnableFcs (bool enable);
|
|
/**
|
|
* \brief Updates the Fcs Field to the correct FCS
|
|
* \param p Reference to a packet on which the FCS should be
|
|
* calculated. The packet should not currently contain an FCS
|
|
* trailer.
|
|
*/
|
|
void CalcFcs (Ptr<Packet> p);
|
|
/**
|
|
* \brief Sets the FCS to a new value
|
|
* \param fcs New FCS value
|
|
*/
|
|
void SetFcs (uint32_t fcs);
|
|
/**
|
|
* \return the FCS contained in this trailer
|
|
*/
|
|
uint32_t GetFcs ();
|
|
|
|
/**
|
|
* \param p Reference to the packet on which the FCS should be
|
|
* calculated. The packet should not contain an FCS trailer.
|
|
* \return Returns true if the packet fcs is correct, false otherwise.
|
|
*
|
|
* If FCS checking is disabled, this method will always
|
|
* return true.
|
|
*/
|
|
bool CheckFcs (Ptr<Packet> p) const;
|
|
|
|
/**
|
|
*\return Returns the size of the trailer
|
|
*/
|
|
uint32_t GetTrailerSize() const;
|
|
|
|
std::string GetName (void) const;
|
|
void Print (std::ostream &os) const;
|
|
uint32_t GetSerializedSize (void) const;
|
|
void Serialize (Buffer::Iterator end) const;
|
|
uint32_t Deserialize (Buffer::Iterator end);
|
|
private:
|
|
|
|
/**
|
|
* Initializes the trailer parameters during construction.
|
|
*/
|
|
void Init (void);
|
|
|
|
/**
|
|
* Enabled FCS calculations. If false, fcs is set to 0 and checkFCS
|
|
* returns true.
|
|
*/
|
|
static bool m_calcFcs;
|
|
uint32_t m_fcs; /// Value of the fcs contained in the trailer
|
|
|
|
};
|
|
|
|
} // namespace ns3
|
|
|
|
|
|
#endif /* ETHERNET_TRAILER_H */
|