96905971f2
Currently, all the network devices create a 16K buffer for the 'data' field in EthPacketData, and use 'length' to keep track of the size of the packet in the buffer. This patch introduces the 'simLength' parameter to EthPacketData, which is used to hold the effective length of the packet used for all timing calulations in the simulator. Serialization is performed using only the useful data in the packet ('length') and not necessarily the entire original buffer.
350 lines
8.8 KiB
C++
350 lines
8.8 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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#include "dev/net/ethertap.hh"
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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 "debug/Ethernet.hh"
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#include "debug/EthernetData.hh"
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#include "dev/net/etherdump.hh"
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#include "dev/net/etherint.hh"
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#include "dev/net/etherpkt.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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// As a consequence of being called from the PollQueue, we might
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// have been called from a different thread. Migrate to "our"
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// thread.
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EventQueue::ScopedMigration migrate(tap->eventQueue());
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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 Params *p)
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: EtherObject(p), event(NULL), socket(-1), buflen(p->bufsz), dump(p->dump),
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interface(NULL), txEvent(this)
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{
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if (ListenSocket::allDisabled())
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fatal("All listeners are disabled! EtherTap can't work!");
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buffer = new char[buflen];
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listener = new TapListener(this, p->port);
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listener->listen();
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interface = new EtherTapInt(name() + ".interface", this);
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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 interface;
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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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ssize_t ret = write(socket, &len, sizeof(len));
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if (ret != sizeof(len))
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return false;
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ret = write(socket, packet->data, packet->length);
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if (ret != packet->length)
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return false;
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interface->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 = make_shared<EthPacketData>(data_len);
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packet->length = data_len;
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packet->simLength = data_len;
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memcpy(packet->data, data, data_len);
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assert(buffer_offset >= data_len + sizeof(uint32_t));
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buffer_offset -= data_len + sizeof(uint32_t);
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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 (!interface->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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schedule(txEvent, 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 (interface->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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schedule(txEvent, curTick() + retryTime);
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}
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EtherInt*
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EtherTap::getEthPort(const std::string &if_name, int idx)
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{
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if (if_name == "tap") {
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if (interface->getPeer())
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panic("Interface already connected to\n");
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return interface;
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}
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return NULL;
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}
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//=====================================================================
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void
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EtherTap::serialize(CheckpointOut &cp) const
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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(cp);
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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(CheckpointIn &cp)
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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);
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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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return new EtherTap(this);
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}
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