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/*
* Copyright (c) 2003-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Nathan Binkert
*/
/* @file
* Interface to connect a simulated ethernet device to the real world
*/
#ifndef __DEV_NET_ETHERTAP_HH__
#define __DEV_NET_ETHERTAP_HH__
#include <queue>
#include <string>
#include "base/pollevent.hh"
#include "config/use_tuntap.hh"
#include "dev/net/etherint.hh"
#include "dev/net/etherobject.hh"
#include "dev/net/etherpkt.hh"
#if USE_TUNTAP
#include "params/EtherTap.hh"
#endif
#include "params/EtherTapStub.hh"
#include "sim/eventq.hh"
#include "sim/sim_object.hh"
class TapEvent;
class EtherTapInt;
class EtherTapBase : public EtherObject
{
public:
typedef EtherTapBaseParams Params;
EtherTapBase(const Params *p);
virtual ~EtherTapBase();
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
protected:
uint8_t *buffer;
int buflen;
EtherDump *dump;
/*
* Interface to the real network.
*/
protected:
friend class TapEvent;
TapEvent *event;
void pollFd(int fd);
void stopPolling();
// Receive data from the real network.
virtual void recvReal(int revent) = 0;
// Prepare and send data out to the real network.
virtual bool sendReal(const void *data, size_t len) = 0;
/*
* Interface to the simulated network.
*/
protected:
EtherTapInt *interface;
public:
EtherInt *getEthPort(const std::string &if_name, int idx) override;
bool recvSimulated(EthPacketPtr packet);
void sendSimulated(void *data, size_t len);
protected:
std::queue<EthPacketPtr> packetBuffer;
void retransmit();
EventFunctionWrapper txEvent;
};
class EtherTapInt : public EtherInt
{
private:
EtherTapBase *tap;
public:
EtherTapInt(const std::string &name, EtherTapBase *t) :
EtherInt(name), tap(t)
{ }
bool recvPacket(EthPacketPtr pkt) override
{ return tap->recvSimulated(pkt); }
void sendDone() override {}
};
class TapListener;
/*
* Interface to connect a simulated ethernet device to the real world. An
* external helper program bridges between this object's TCP port and a
* source/sink for Ethernet frames. Each frame going in either direction is
* prepended with the frame's length in a 32 bit integer in network byte order.
*/
class EtherTapStub : public EtherTapBase
{
public:
typedef EtherTapStubParams Params;
EtherTapStub(const Params *p);
~EtherTapStub();
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
protected:
friend class TapListener;
TapListener *listener;
int socket;
void attach(int fd);
void detach();
uint32_t buffer_used;
uint32_t frame_len;
void recvReal(int revent) override;
bool sendReal(const void *data, size_t len) override;
};
#if USE_TUNTAP
class EtherTap : public EtherTapBase
{
public:
typedef EtherTapParams Params;
EtherTap(const Params *p);
~EtherTap();
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
protected:
int tap;
void recvReal(int revent) override;
bool sendReal(const void *data, size_t len) override;
};
#endif
#endif // __DEV_NET_ETHERTAP_HH__
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