ethertap.hh revision 2665
1/* 2 * Copyright (c) 2003-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Nathan Binkert 29 */ 30 31/* @file 32 * Interface to connect a simulated ethernet device to the real world 33 */ 34 35#ifndef __ETHERTAP_HH__ 36#define __ETHERTAP_HH__ 37 38#include <queue> 39#include <string> 40 41#include "dev/etherint.hh" 42#include "dev/etherpkt.hh" 43#include "sim/eventq.hh" 44#include "base/pollevent.hh" 45#include "sim/sim_object.hh" 46 47class TapEvent; 48class TapListener; 49 50/* 51 * Interface to connect a simulated ethernet device to the real world 52 */ 53class EtherTap : public EtherInt 54{ 55 protected: 56 friend class TapEvent; 57 TapEvent *event; 58 59 protected: 60 friend class TapListener; 61 TapListener *listener; 62 int socket; 63 char *buffer; 64 int buflen; 65 int32_t buffer_offset; 66 int32_t data_len; 67 68 EtherDump *dump; 69 70 void attach(int fd); 71 void detach(); 72 73 protected: 74 std::string device; 75 std::queue<EthPacketPtr> packetBuffer; 76 77 void process(int revent); 78 void enqueue(EthPacketData *packet); 79 void retransmit(); 80 81 /* 82 */ 83 class TxEvent : public Event 84 { 85 protected: 86 EtherTap *tap; 87 88 public: 89 TxEvent(EtherTap *_tap) 90 : Event(&mainEventQueue), tap(_tap) {} 91 void process() { tap->retransmit(); } 92 virtual const char *description() { return "retransmit event"; } 93 }; 94 95 friend class TxEvent; 96 TxEvent txEvent; 97 98 public: 99 EtherTap(const std::string &name, EtherDump *dump, int port, int bufsz); 100 virtual ~EtherTap(); 101 102 virtual bool recvPacket(EthPacketPtr packet); 103 virtual void sendDone(); 104 105 virtual void serialize(std::ostream &os); 106 virtual void unserialize(Checkpoint *cp, const std::string §ion); 107}; 108 109#endif // __ETHERTAP_HH__ 110