gem5/dev/ethertap.hh
Nathan Binkert a58b834c8e Clean up network header stuff and make it more generic. Use
libdnet when we can instead of our own home grown stuff.

SConscript:
    separate the crc code into its own file
base/inet.cc:
    move the crc stuff to crc.cc
    add generic code for calculating ip/tcp/udp checksums
base/inet.hh:
    -  move crc stuff to crc.hh
    -  #include all of the libdnet stuff.  (this makes base/inet.hh the
    only file you need to include if you want to use this kind of stuff.)
    -  Wrap some of the libdnet structs to get easier access to structure
    members.  These wrappers will automatically deal with masking/shifting/
    byte-swapping.
base/refcnt.hh:
    If one derives from RefCountingPtr, they should have access to
    the internal data pointer.
build/SConstruct:
    make #include of dnet stuff work
dev/etherlink.cc:
dev/ethertap.cc:
dev/ethertap.hh:
    EtherPacket -> PacketData
dev/etherpkt.cc:
    EtherPacket -> PacketData
    add a function for populating extra info about a packet.
    Basically just gives pointers to ethernet/ip/tcp/udp headers
    if they exist.
dev/etherpkt.hh:
    EtherPacket -> PacketData
    remove most of the packet header stuff from teh PacketData
    class and just add a few generic functions for grabbing various
    headers that may exist in the packet.  The old functionality is
    contained in the headers.
dev/ns_gige.cc:
    -  IP -> Ip, UDP -> Udp, TCP ->Tcp when used in variable names
    -  get rid of our own byte swapping functions.
    -  whack checksum code and use libdnet version.
    -  Get pointers to the various packet headers and grab info from
    those headers.  (The byte swapping in the headers now.)
    -  Add stats for Udp Checksums
dev/ns_gige.hh:
    use libdnet for checksum code.
    IP -> Ip, TCP -> Tcp in variable names
    add stats for UDP checksums

--HG--
extra : convert_revision : 96c4160e1967b7c0090acd456df4a76e1f3aab53
2004-09-20 10:43:53 -04:00

104 lines
3.1 KiB
C++

/*
* Copyright (c) 2003-2004 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.
*/
/* @file
* Interface to connect a simulated ethernet device to the real world
*/
#ifndef __ETHERTAP_HH__
#define __ETHERTAP_HH__
#include <queue>
#include <string>
#include "dev/etherint.hh"
#include "dev/etherpkt.hh"
#include "sim/eventq.hh"
#include "base/pollevent.hh"
#include "sim/sim_object.hh"
/*
* Interface to connect a simulated ethernet device to the real world
*/
class EtherTap : public EtherInt
{
protected:
friend class TapEvent;
TapEvent *event;
protected:
friend class TapListener;
TapListener *listener;
int socket;
char *buffer;
int buflen;
int32_t buffer_offset;
int32_t data_len;
EtherDump *dump;
void attach(int fd);
void detach();
protected:
std::string device;
std::queue<PacketPtr> packetBuffer;
void process(int revent);
void enqueue(PacketData *packet);
void retransmit();
/*
*/
class TxEvent : public Event
{
protected:
EtherTap *tap;
public:
TxEvent(EtherTap *_tap)
: Event(&mainEventQueue), tap(_tap) {}
void process() { tap->retransmit(); }
virtual const char *description() { return "retransmit event"; }
};
friend class TxEvent;
TxEvent txEvent;
public:
EtherTap(const std::string &name, EtherDump *dump, int port, int bufsz);
virtual ~EtherTap();
virtual bool recvPacket(PacketPtr &packet);
virtual void sendDone();
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string &section);
};
#endif // __ETHERTAP_HH__