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;

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51#include "debug/Ethernet.hh"
52#include "debug/EthernetData.hh"
53#include "dev/net/etherdump.hh"
54#include "dev/net/etherint.hh"
55#include "dev/net/etherpkt.hh"
56
57using namespace std;
58
59class TapEvent : public PollEvent
60{
61 protected:
62 EtherTapBase *tap;
63
64 public:
65 TapEvent(EtherTapBase *_tap, int fd, int e)
66 : PollEvent(fd, e), tap(_tap) {}
67 virtual void process(int revent) { tap->recvReal(revent); }
68};
69
70EtherTapBase::EtherTapBase(const Params *p)
71 : EtherObject(p), buflen(p->bufsz), dump(p->dump), event(NULL),
72 interface(NULL), txEvent(this)
73{
74 buffer = new uint8_t[buflen];
75 interface = new EtherTapInt(name() + ".interface", this);
76}
77
78EtherTapBase::~EtherTapBase()
79{
80 delete buffer;
81 delete event;
82 delete interface;
83}
84
85void
86EtherTapBase::serialize(CheckpointOut &cp) const
87{
88 SERIALIZE_SCALAR(buflen);
89 uint8_t *buffer = (uint8_t *)this->buffer;
90 SERIALIZE_ARRAY(buffer, buflen);
91
92 bool tapevent_present = false;
93 if (event) {
94 tapevent_present = true;
95 SERIALIZE_SCALAR(tapevent_present);
96 event->serialize(cp);
97 } else {
98 SERIALIZE_SCALAR(tapevent_present);
99 }
100}
101
102void
103EtherTapBase::unserialize(CheckpointIn &cp)
104{
105 UNSERIALIZE_SCALAR(buflen);
106 uint8_t *buffer = (uint8_t *)this->buffer;
107 UNSERIALIZE_ARRAY(buffer, buflen);
108
109 bool tapevent_present;
110 UNSERIALIZE_SCALAR(tapevent_present);
111 if (tapevent_present) {
112 event = new TapEvent(this, 0, 0);
113 event->unserialize(cp);
114 if (event->queued())
115 pollQueue.schedule(event);
116 }
117}
118
119
120void
121EtherTapBase::pollFd(int fd)
122{
123 assert(!event);
124 event = new TapEvent(this, fd, POLLIN|POLLERR);
125 pollQueue.schedule(event);
126}
127
128void
129EtherTapBase::stopPolling()
130{
131 assert(event);
132 delete event;
133 event = NULL;
134}
135
136
137EtherInt*
138EtherTapBase::getEthPort(const std::string &if_name, int idx)
139{
140 if (if_name == "tap") {
141 if (interface->getPeer())
142 panic("Interface already connected to\n");
143 return interface;
144 }
145 return NULL;
146}
147
148bool
149EtherTapBase::recvSimulated(EthPacketPtr packet)
150{
151 if (dump)
152 dump->dump(packet);
153
154 DPRINTF(Ethernet, "EtherTap sim->real len=%d\n", packet->length);
155 DDUMP(EthernetData, packet->data, packet->length);
156
157 bool success = sendReal(packet->data, packet->length);
158
159 interface->recvDone();
160
161 return success;
162}
163
164void
165EtherTapBase::sendSimulated(void *data, size_t len)
166{
167 EthPacketPtr packet;
168 packet = make_shared<EthPacketData>(len);
169 packet->length = len;
170 packet->simLength = len;
171 memcpy(packet->data, data, len);
172
173 DPRINTF(Ethernet, "EtherTap real->sim len=%d\n", packet->length);
174 DDUMP(EthernetData, packet->data, packet->length);
175 if (!packetBuffer.empty() || !interface->sendPacket(packet)) {
176 DPRINTF(Ethernet, "bus busy...buffer for retransmission\n");
177 packetBuffer.push(packet);
178 if (!txEvent.scheduled())
179 schedule(txEvent, curTick() + retryTime);
180 } else if (dump) {
181 dump->dump(packet);
182 }
183}
184
185void
186EtherTapBase::retransmit()
187{
188 if (packetBuffer.empty())
189 return;
190
191 EthPacketPtr packet = packetBuffer.front();
192 if (interface->sendPacket(packet)) {
193 if (dump)
194 dump->dump(packet);
195 DPRINTF(Ethernet, "EtherTap retransmit\n");
196 packetBuffer.front() = NULL;
197 packetBuffer.pop();
198 }
199
200 if (!packetBuffer.empty() && !txEvent.scheduled())
201 schedule(txEvent, curTick() + retryTime);
202}
203
204
205class TapListener
206{
207 protected:
208 class Event : public PollEvent
209 {
210 protected:
211 TapListener *listener;
212
213 public:
214 Event(TapListener *l, int fd, int e) : PollEvent(fd, e), listener(l) {}
215
216 void process(int revent) override { listener->accept(); }
217 };
218
219 friend class Event;
220 Event *event;
221
222 void accept();
223
224 protected:
225 ListenSocket listener;
226 EtherTapStub *tap;
227 int port;
228
229 public:
230 TapListener(EtherTapStub *t, int p) : event(NULL), tap(t), port(p) {}
231 ~TapListener() { delete event; }
232
233 void listen();
234};
235
236void
237TapListener::listen()
238{
239 while (!listener.listen(port, true)) {
240 DPRINTF(Ethernet, "TapListener(listen): Can't bind port %d\n", port);

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257 if (!listener.islistening())
258 panic("TapListener(accept): cannot accept if we're not listening!");
259
260 int sfd = listener.accept(true);
261 if (sfd != -1)
262 tap->attach(sfd);
263}
264
265
266EtherTapStub::EtherTapStub(const Params *p) : EtherTapBase(p), socket(-1)
267{
268 if (ListenSocket::allDisabled())
269 fatal("All listeners are disabled! EtherTapStub can't work!");
270
271 listener = new TapListener(this, p->port);
272 listener->listen();
273}
274
275EtherTapStub::~EtherTapStub()
276{
277 delete listener;
278}
279
280void
281EtherTapStub::serialize(CheckpointOut &cp) const
282{
283 EtherTapBase::serialize(cp);
284
285 SERIALIZE_SCALAR(socket);
286 SERIALIZE_SCALAR(buffer_used);
287 SERIALIZE_SCALAR(frame_len);
288}
289
290void
291EtherTapStub::unserialize(CheckpointIn &cp)
292{
293 EtherTapBase::unserialize(cp);
294
295 UNSERIALIZE_SCALAR(socket);
296 UNSERIALIZE_SCALAR(buffer_used);
297 UNSERIALIZE_SCALAR(frame_len);
298}
299
300
301void
302EtherTapStub::attach(int fd)
303{
304 if (socket != -1)
305 close(fd);
306
307 buffer_used = 0;
308 frame_len = 0;
309 socket = fd;
310 DPRINTF(Ethernet, "EtherTapStub attached\n");
311 pollFd(socket);
312}
313
314void
315EtherTapStub::detach()
316{
317 DPRINTF(Ethernet, "EtherTapStub detached\n");
318 stopPolling();
319 close(socket);
320 socket = -1;
321}
322
323void
324EtherTapStub::recvReal(int revent)
325{
326 if (revent & POLLERR) {
327 detach();
328 return;
329 }
330
331 if (!(revent & POLLIN))
332 return;
333
334 // Read in as much of the new data as we can.
335 int len = read(socket, buffer + buffer_used, buflen - buffer_used);
336 if (len == 0) {
337 detach();
338 return;
339 }
340 buffer_used += len;
341
342 // If there's not enough data for the frame length, wait for more.
343 if (buffer_used < sizeof(uint32_t))
344 return;
345
346 if (frame_len == 0)
347 frame_len = ntohl(*(uint32_t *)buffer);
348
349 DPRINTF(Ethernet, "Received data from peer: len=%d buffer_used=%d "
350 "frame_len=%d\n", len, buffer_used, frame_len);
351
352 uint8_t *frame_start = &buffer[sizeof(uint32_t)];
353 while (frame_len != 0 && buffer_used >= frame_len + sizeof(uint32_t)) {
354 sendSimulated(frame_start, frame_len);
355
356 // Bookkeeping.
357 buffer_used -= frame_len + sizeof(uint32_t);
358 if (buffer_used > 0) {
359 // If there's still any data left, move it into position.
360 memmove(buffer, frame_start + frame_len, buffer_used);
361 }
362 frame_len = 0;
363
364 if (buffer_used >= sizeof(uint32_t))
365 frame_len = ntohl(*(uint32_t *)buffer);
366 }
367}
368
369bool
370EtherTapStub::sendReal(const void *data, size_t len)
371{
372 uint32_t frame_len = htonl(len);
373 ssize_t ret = write(socket, &frame_len, sizeof(frame_len));
374 if (ret != sizeof(frame_len))
375 return false;
376 return write(socket, data, len) == len;
377}
378
379
380EtherTapStub *
381EtherTapStubParams::create()
382{
383 return new EtherTapStub(this);
384}