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-rw-r--r--dev/ethertap.cc345
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diff --git a/dev/ethertap.cc b/dev/ethertap.cc
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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.
- */
-
-/* @file
- * Interface to connect a simulated ethernet device to the real world
- */
-
-#if defined(__OpenBSD__) || defined(__APPLE__)
-#include <sys/param.h>
-#endif
-#include <netinet/in.h>
-
-#include <unistd.h>
-
-#include <deque>
-#include <string>
-
-#include "base/misc.hh"
-#include "base/pollevent.hh"
-#include "base/socket.hh"
-#include "base/trace.hh"
-#include "dev/etherdump.hh"
-#include "dev/etherint.hh"
-#include "dev/etherpkt.hh"
-#include "dev/ethertap.hh"
-#include "sim/builder.hh"
-
-using namespace std;
-
-/**
- */
-class TapListener
-{
- protected:
- /**
- */
- class Event : public PollEvent
- {
- protected:
- TapListener *listener;
-
- public:
- Event(TapListener *l, int fd, int e)
- : PollEvent(fd, e), listener(l) {}
-
- virtual void process(int revent) { listener->accept(); }
- };
-
- friend class Event;
- Event *event;
-
- protected:
- ListenSocket listener;
- EtherTap *tap;
- int port;
-
- public:
- TapListener(EtherTap *t, int p)
- : event(NULL), tap(t), port(p) {}
- ~TapListener() { if (event) delete event; }
-
- void accept();
- void listen();
-};
-
-void
-TapListener::listen()
-{
- while (!listener.listen(port, true)) {
- DPRINTF(Ethernet, "TapListener(listen): Can't bind port %d\n", port);
- port++;
- }
-
- ccprintf(cerr, "Listening for tap connection on port %d\n", port);
- event = new Event(this, listener.getfd(), POLLIN|POLLERR);
- pollQueue.schedule(event);
-}
-
-void
-TapListener::accept()
-{
- if (!listener.islistening())
- panic("TapListener(accept): cannot accept if we're not listening!");
-
- int sfd = listener.accept(true);
- if (sfd != -1)
- tap->attach(sfd);
-}
-
-/**
- */
-class TapEvent : public PollEvent
-{
- protected:
- EtherTap *tap;
-
- public:
- TapEvent(EtherTap *_tap, int fd, int e)
- : PollEvent(fd, e), tap(_tap) {}
- virtual void process(int revent) { tap->process(revent); }
-};
-
-EtherTap::EtherTap(const string &name, EtherDump *d, int port, int bufsz)
- : EtherInt(name), event(NULL), socket(-1), buflen(bufsz), dump(d),
- txEvent(this)
-{
- buffer = new char[buflen];
- listener = new TapListener(this, port);
- listener->listen();
-}
-
-EtherTap::~EtherTap()
-{
- if (event)
- delete event;
- if (buffer)
- delete [] buffer;
-
- delete listener;
-}
-
-void
-EtherTap::attach(int fd)
-{
- if (socket != -1)
- close(fd);
-
- buffer_offset = 0;
- data_len = 0;
- socket = fd;
- DPRINTF(Ethernet, "EtherTap attached\n");
- event = new TapEvent(this, socket, POLLIN|POLLERR);
- pollQueue.schedule(event);
-}
-
-void
-EtherTap::detach()
-{
- DPRINTF(Ethernet, "EtherTap detached\n");
- delete event;
- event = 0;
- close(socket);
- socket = -1;
-}
-
-bool
-EtherTap::recvPacket(EthPacketPtr packet)
-{
- if (dump)
- dump->dump(packet);
-
- DPRINTF(Ethernet, "EtherTap output len=%d\n", packet->length);
- DDUMP(EthernetData, packet->data, packet->length);
- u_int32_t len = htonl(packet->length);
- write(socket, &len, sizeof(len));
- write(socket, packet->data, packet->length);
-
- recvDone();
-
- return true;
-}
-
-void
-EtherTap::sendDone()
-{}
-
-void
-EtherTap::process(int revent)
-{
- if (revent & POLLERR) {
- detach();
- return;
- }
-
- char *data = buffer + sizeof(u_int32_t);
- if (!(revent & POLLIN))
- return;
-
- if (buffer_offset < data_len + sizeof(u_int32_t)) {
- int len = read(socket, buffer + buffer_offset, buflen - buffer_offset);
- if (len == 0) {
- detach();
- return;
- }
-
- buffer_offset += len;
-
- if (data_len == 0)
- data_len = ntohl(*(u_int32_t *)buffer);
-
- DPRINTF(Ethernet, "Received data from peer: len=%d buffer_offset=%d "
- "data_len=%d\n", len, buffer_offset, data_len);
- }
-
- while (data_len != 0 && buffer_offset >= data_len + sizeof(u_int32_t)) {
- EthPacketPtr packet;
- packet = new EthPacketData(data_len);
- packet->length = data_len;
- memcpy(packet->data, data, data_len);
-
- buffer_offset -= data_len + sizeof(u_int32_t);
- assert(buffer_offset >= 0);
- if (buffer_offset > 0) {
- memmove(buffer, data + data_len, buffer_offset);
- data_len = ntohl(*(u_int32_t *)buffer);
- } else
- data_len = 0;
-
- DPRINTF(Ethernet, "EtherTap input len=%d\n", packet->length);
- DDUMP(EthernetData, packet->data, packet->length);
- if (!sendPacket(packet)) {
- DPRINTF(Ethernet, "bus busy...buffer for retransmission\n");
- packetBuffer.push(packet);
- if (!txEvent.scheduled())
- txEvent.schedule(curTick + retryTime);
- } else if (dump) {
- dump->dump(packet);
- }
- }
-}
-
-void
-EtherTap::retransmit()
-{
- if (packetBuffer.empty())
- return;
-
- EthPacketPtr packet = packetBuffer.front();
- if (sendPacket(packet)) {
- if (dump)
- dump->dump(packet);
- DPRINTF(Ethernet, "EtherTap retransmit\n");
- packetBuffer.front() = NULL;
- packetBuffer.pop();
- }
-
- if (!packetBuffer.empty() && !txEvent.scheduled())
- txEvent.schedule(curTick + retryTime);
-}
-
-//=====================================================================
-
-void
-EtherTap::serialize(ostream &os)
-{
- SERIALIZE_SCALAR(socket);
- SERIALIZE_SCALAR(buflen);
- uint8_t *buffer = (uint8_t *)this->buffer;
- SERIALIZE_ARRAY(buffer, buflen);
- SERIALIZE_SCALAR(buffer_offset);
- SERIALIZE_SCALAR(data_len);
-
- bool tapevent_present = false;
- if (event) {
- tapevent_present = true;
- SERIALIZE_SCALAR(tapevent_present);
- event->serialize(os);
- }
- else {
- SERIALIZE_SCALAR(tapevent_present);
- }
-}
-
-void
-EtherTap::unserialize(Checkpoint *cp, const std::string &section)
-{
- UNSERIALIZE_SCALAR(socket);
- UNSERIALIZE_SCALAR(buflen);
- uint8_t *buffer = (uint8_t *)this->buffer;
- UNSERIALIZE_ARRAY(buffer, buflen);
- UNSERIALIZE_SCALAR(buffer_offset);
- UNSERIALIZE_SCALAR(data_len);
-
- bool tapevent_present;
- UNSERIALIZE_SCALAR(tapevent_present);
- if (tapevent_present) {
- event = new TapEvent(this, socket, POLLIN|POLLERR);
-
- event->unserialize(cp,section);
-
- if (event->queued()) {
- pollQueue.schedule(event);
- }
- }
-}
-
-//=====================================================================
-
-BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherTap)
-
- SimObjectParam<EtherInt *> peer;
- SimObjectParam<EtherDump *> dump;
- Param<unsigned> port;
- Param<unsigned> bufsz;
-
-END_DECLARE_SIM_OBJECT_PARAMS(EtherTap)
-
-BEGIN_INIT_SIM_OBJECT_PARAMS(EtherTap)
-
- INIT_PARAM_DFLT(peer, "peer interface", NULL),
- INIT_PARAM_DFLT(dump, "object to dump network packets to", NULL),
- INIT_PARAM_DFLT(port, "tap port", 3500),
- INIT_PARAM_DFLT(bufsz, "tap buffer size", 10000)
-
-END_INIT_SIM_OBJECT_PARAMS(EtherTap)
-
-
-CREATE_SIM_OBJECT(EtherTap)
-{
- EtherTap *tap = new EtherTap(getInstanceName(), dump, port, bufsz);
-
- if (peer) {
- tap->setPeer(peer);
- peer->setPeer(tap);
- }
-
- return tap;
-}
-
-REGISTER_SIM_OBJECT("EtherTap", EtherTap)
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-20 16:59:04 +0000