abc76f20cb
creation and initialization now happens in python. Parameter objects are generated and initialized by python. The .ini file is now solely for debugging purposes and is not used in construction of the objects in any way. --HG-- extra : convert_revision : 7e722873e417cb3d696f2e34c35ff488b7bff4ed
328 lines
8 KiB
C++
328 lines
8 KiB
C++
/*
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* Copyright (c) 2003-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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*/
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/* @file
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* Interface to connect a simulated ethernet device to the real world
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*/
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#if defined(__OpenBSD__) || defined(__APPLE__)
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#include <sys/param.h>
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#endif
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#include <netinet/in.h>
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#include <unistd.h>
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#include <deque>
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#include <string>
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#include "base/misc.hh"
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#include "base/pollevent.hh"
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#include "base/socket.hh"
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#include "base/trace.hh"
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#include "dev/etherdump.hh"
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#include "dev/etherint.hh"
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#include "dev/etherpkt.hh"
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#include "dev/ethertap.hh"
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#include "params/EtherTap.hh"
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using namespace std;
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/**
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*/
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class TapListener
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{
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protected:
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/**
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*/
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class Event : public PollEvent
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{
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protected:
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TapListener *listener;
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public:
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Event(TapListener *l, int fd, int e)
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: PollEvent(fd, e), listener(l) {}
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virtual void process(int revent) { listener->accept(); }
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};
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friend class Event;
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Event *event;
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protected:
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ListenSocket listener;
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EtherTap *tap;
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int port;
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public:
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TapListener(EtherTap *t, int p)
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: event(NULL), tap(t), port(p) {}
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~TapListener() { if (event) delete event; }
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void accept();
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void listen();
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};
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void
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TapListener::listen()
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{
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while (!listener.listen(port, true)) {
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DPRINTF(Ethernet, "TapListener(listen): Can't bind port %d\n", port);
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port++;
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}
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ccprintf(cerr, "Listening for tap connection on port %d\n", port);
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event = new Event(this, listener.getfd(), POLLIN|POLLERR);
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pollQueue.schedule(event);
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}
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void
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TapListener::accept()
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{
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if (!listener.islistening())
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panic("TapListener(accept): cannot accept if we're not listening!");
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int sfd = listener.accept(true);
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if (sfd != -1)
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tap->attach(sfd);
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}
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/**
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*/
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class TapEvent : public PollEvent
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{
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protected:
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EtherTap *tap;
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public:
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TapEvent(EtherTap *_tap, int fd, int e)
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: PollEvent(fd, e), tap(_tap) {}
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virtual void process(int revent) { tap->process(revent); }
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};
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EtherTap::EtherTap(const string &name, EtherDump *d, int port, int bufsz)
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: EtherInt(name), event(NULL), socket(-1), buflen(bufsz), dump(d),
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txEvent(this)
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{
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buffer = new char[buflen];
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listener = new TapListener(this, port);
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listener->listen();
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}
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EtherTap::~EtherTap()
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{
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if (event)
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delete event;
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if (buffer)
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delete [] buffer;
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delete listener;
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}
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void
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EtherTap::attach(int fd)
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{
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if (socket != -1)
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close(fd);
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buffer_offset = 0;
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data_len = 0;
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socket = fd;
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DPRINTF(Ethernet, "EtherTap attached\n");
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event = new TapEvent(this, socket, POLLIN|POLLERR);
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pollQueue.schedule(event);
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}
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void
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EtherTap::detach()
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{
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DPRINTF(Ethernet, "EtherTap detached\n");
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delete event;
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event = 0;
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close(socket);
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socket = -1;
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}
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bool
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EtherTap::recvPacket(EthPacketPtr packet)
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{
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if (dump)
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dump->dump(packet);
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DPRINTF(Ethernet, "EtherTap output len=%d\n", packet->length);
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DDUMP(EthernetData, packet->data, packet->length);
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uint32_t len = htonl(packet->length);
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write(socket, &len, sizeof(len));
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write(socket, packet->data, packet->length);
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recvDone();
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return true;
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}
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void
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EtherTap::sendDone()
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{}
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void
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EtherTap::process(int revent)
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{
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if (revent & POLLERR) {
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detach();
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return;
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}
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char *data = buffer + sizeof(uint32_t);
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if (!(revent & POLLIN))
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return;
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if (buffer_offset < data_len + sizeof(uint32_t)) {
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int len = read(socket, buffer + buffer_offset, buflen - buffer_offset);
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if (len == 0) {
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detach();
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return;
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}
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buffer_offset += len;
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if (data_len == 0)
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data_len = ntohl(*(uint32_t *)buffer);
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DPRINTF(Ethernet, "Received data from peer: len=%d buffer_offset=%d "
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"data_len=%d\n", len, buffer_offset, data_len);
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}
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while (data_len != 0 && buffer_offset >= data_len + sizeof(uint32_t)) {
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EthPacketPtr packet;
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packet = new EthPacketData(data_len);
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packet->length = data_len;
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memcpy(packet->data, data, data_len);
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buffer_offset -= data_len + sizeof(uint32_t);
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assert(buffer_offset >= 0);
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if (buffer_offset > 0) {
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memmove(buffer, data + data_len, buffer_offset);
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data_len = ntohl(*(uint32_t *)buffer);
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} else
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data_len = 0;
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DPRINTF(Ethernet, "EtherTap input len=%d\n", packet->length);
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DDUMP(EthernetData, packet->data, packet->length);
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if (!sendPacket(packet)) {
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DPRINTF(Ethernet, "bus busy...buffer for retransmission\n");
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packetBuffer.push(packet);
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if (!txEvent.scheduled())
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txEvent.schedule(curTick + retryTime);
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} else if (dump) {
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dump->dump(packet);
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}
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}
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}
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void
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EtherTap::retransmit()
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{
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if (packetBuffer.empty())
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return;
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EthPacketPtr packet = packetBuffer.front();
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if (sendPacket(packet)) {
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if (dump)
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dump->dump(packet);
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DPRINTF(Ethernet, "EtherTap retransmit\n");
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packetBuffer.front() = NULL;
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packetBuffer.pop();
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}
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if (!packetBuffer.empty() && !txEvent.scheduled())
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txEvent.schedule(curTick + retryTime);
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}
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//=====================================================================
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void
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EtherTap::serialize(ostream &os)
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{
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SERIALIZE_SCALAR(socket);
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SERIALIZE_SCALAR(buflen);
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uint8_t *buffer = (uint8_t *)this->buffer;
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SERIALIZE_ARRAY(buffer, buflen);
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SERIALIZE_SCALAR(buffer_offset);
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SERIALIZE_SCALAR(data_len);
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bool tapevent_present = false;
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if (event) {
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tapevent_present = true;
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SERIALIZE_SCALAR(tapevent_present);
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event->serialize(os);
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}
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else {
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SERIALIZE_SCALAR(tapevent_present);
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}
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}
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void
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EtherTap::unserialize(Checkpoint *cp, const std::string §ion)
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{
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UNSERIALIZE_SCALAR(socket);
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UNSERIALIZE_SCALAR(buflen);
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uint8_t *buffer = (uint8_t *)this->buffer;
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UNSERIALIZE_ARRAY(buffer, buflen);
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UNSERIALIZE_SCALAR(buffer_offset);
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UNSERIALIZE_SCALAR(data_len);
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bool tapevent_present;
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UNSERIALIZE_SCALAR(tapevent_present);
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if (tapevent_present) {
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event = new TapEvent(this, socket, POLLIN|POLLERR);
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event->unserialize(cp,section);
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if (event->queued()) {
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pollQueue.schedule(event);
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}
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}
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}
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//=====================================================================
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EtherTap *
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EtherTapParams::create()
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{
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EtherTap *tap = new EtherTap(name, dump, port, bufsz);
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if (peer) {
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tap->setPeer(peer);
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peer->setPeer(tap);
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}
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return tap;
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}
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