DrvNAT.cpp@ 15209

Last change on this file since 15209 was 14391, checked in by vboxsync, 16 years ago
slirp: simplified sync is default now
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Line
1	/** @file
2	*
3	* VBox network devices:
4	* NAT network transport driver
5	*/
6
7	/*
8	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
9	*
10	* This file is part of VirtualBox Open Source Edition (OSE), as
11	* available from http://www.virtualbox.org. This file is free software;
12	* you can redistribute it and/or modify it under the terms of the GNU
13	* General Public License (GPL) as published by the Free Software
14	* Foundation, in version 2 as it comes in the "COPYING" file of the
15	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
16	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
17	*
18	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
19	* Clara, CA 95054 USA or visit http://www.sun.com if you need
20	* additional information or have any questions.
21	*/
22
23
24	/*******************************************************************************
25	* Header Files *
26	*******************************************************************************/
27	#define LOG_GROUP LOG_GROUP_DRV_NAT
28	#define __STDC_LIMIT_MACROS
29	#define __STDC_CONSTANT_MACROS
30	#include "Network/slirp/libslirp.h"
31	#include <VBox/pdmdrv.h>
32	#include <iprt/assert.h>
33	#include <iprt/file.h>
34	#include <iprt/string.h>
35	#include <iprt/critsect.h>
36	#include <iprt/cidr.h>
37	#include <iprt/stream.h>
38
39	#include "Builtins.h"
40
41	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
42	# ifndef RT_OS_WINDOWS
43	# include <unistd.h>
44	# endif
45	# include <errno.h>
46	# include <iprt/semaphore.h>
47	# include <iprt/req.h>
48	#endif
49
50
51	/*******************************************************************************
52	* Structures and Typedefs *
53	*******************************************************************************/
54	/**
55	* NAT network transport driver instance data.
56	*/
57	typedef struct DRVNAT
58	{
59	/** The network interface. */
60	PDMINETWORKCONNECTOR INetworkConnector;
61	/** The port we're attached to. */
62	PPDMINETWORKPORT pPort;
63	/** The network config of the port we're attached to. */
64	PPDMINETWORKCONFIG pConfig;
65	/** Pointer to the driver instance. */
66	PPDMDRVINS pDrvIns;
67	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
68	/** Slirp critical section. */
69	RTCRITSECT CritSect;
70	#endif
71	/** Link state */
72	PDMNETWORKLINKSTATE enmLinkState;
73	/** NAT state for this instance. */
74	PNATState pNATState;
75	/** TFTP directory prefix. */
76	char *pszTFTPPrefix;
77	/** Boot file name to provide in the DHCP server response. */
78	char *pszBootFile;
79	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
80	/* polling thread */
81	PPDMTHREAD pThread;
82	/** Queue for NAT-thread-external events. */
83	PRTREQQUEUE pReqQueue;
84	# ifndef RT_OS_WINDOWS
85	/** The write end of the control pipe. */
86	RTFILE PipeWrite;
87	/** The read end of the control pipe. */
88	RTFILE PipeRead;
89	# else
90	/** for external notification */
91	HANDLE hWakeupEvent;
92	# endif
93	#endif
94	} DRVNAT, *PDRVNAT;
95
96	/** Converts a pointer to NAT::INetworkConnector to a PRDVNAT. */
97	#define PDMINETWORKCONNECTOR_2_DRVNAT(pInterface) ( (PDRVNAT)((uintptr_t)pInterface - RT_OFFSETOF(DRVNAT, INetworkConnector)) )
98
99
100	/**
101	* Worker function for drvNATSend().
102	* @thread "NAT" thread.
103	*/
104	static void drvNATSendWorker(PDRVNAT pThis, const void *pvBuf, size_t cb)
105	{
106	Assert(pThis->enmLinkState == PDMNETWORKLINKSTATE_UP);
107	if (pThis->enmLinkState == PDMNETWORKLINKSTATE_UP)
108	slirp_input(pThis->pNATState, (uint8_t *)pvBuf, cb);
109	}
110
111	/**
112	* Send data to the network.
113	*
114	* @returns VBox status code.
115	* @param pInterface Pointer to the interface structure containing the called function pointer.
116	* @param pvBuf Data to send.
117	* @param cb Number of bytes to send.
118	* @thread EMT
119	*/
120	static DECLCALLBACK(int) drvNATSend(PPDMINETWORKCONNECTOR pInterface, const void *pvBuf, size_t cb)
121	{
122	PDRVNAT pThis = PDMINETWORKCONNECTOR_2_DRVNAT(pInterface);
123
124	LogFlow(("drvNATSend: pvBuf=%p cb=%#x\n", pvBuf, cb));
125	Log2(("drvNATSend: pvBuf=%p cb=%#x\n%.*Rhxd\n", pvBuf, cb, cb, pvBuf));
126
127	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
128
129	PRTREQ pReq = NULL;
130	int rc;
131	/* don't queue new requests when the NAT thread is about to stop */
132	if (pThis->pThread->enmState != PDMTHREADSTATE_RUNNING)
133	return VINF_SUCCESS;
134	rc = RTReqAlloc(pThis->pReqQueue, &pReq, RTREQTYPE_INTERNAL);
135	AssertReleaseRC(rc);
136	pReq->u.Internal.pfn = (PFNRT)drvNATSendWorker;
137	pReq->u.Internal.cArgs = 3;
138	pReq->u.Internal.aArgs[0] = (uintptr_t)pThis;
139	pReq->u.Internal.aArgs[1] = (uintptr_t)pvBuf;
140	pReq->u.Internal.aArgs[2] = (uintptr_t)cb;
141	pReq->fFlags = RTREQFLAGS_VOID;
142	rc = RTReqQueue(pReq, 0); /* don't wait, we have to wakeup the NAT thread fist */
143	if (RT_LIKELY(rc == VERR_TIMEOUT))
144	{
145	# ifndef RT_OS_WINDOWS
146	/* kick select() */
147	rc = RTFileWrite(pThis->PipeWrite, "", 1, NULL);
148	AssertRC(rc);
149	# else
150	/* kick WSAWaitForMultipleEvents */
151	rc = WSASetEvent(pThis->hWakeupEvent);
152	AssertRelease(rc == TRUE);
153	# endif
154	rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
155	AssertReleaseRC(rc);
156	}
157	else
158	AssertReleaseRC(rc);
159	RTReqFree(pReq);
160
161	#else /* !VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
162
163	int rc = RTCritSectEnter(&pThis->CritSect);
164	AssertReleaseRC(rc);
165
166	drvNATSendWorker(pThis, pvBuf, cb);
167
168	RTCritSectLeave(&pThis->CritSect);
169
170	#endif /* !VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
171
172	LogFlow(("drvNATSend: end\n"));
173	return VINF_SUCCESS;
174	}
175
176
177	/**
178	* Set promiscuous mode.
179	*
180	* This is called when the promiscuous mode is set. This means that there doesn't have
181	* to be a mode change when it's called.
182	*
183	* @param pInterface Pointer to the interface structure containing the called function pointer.
184	* @param fPromiscuous Set if the adaptor is now in promiscuous mode. Clear if it is not.
185	* @thread EMT
186	*/
187	static DECLCALLBACK(void) drvNATSetPromiscuousMode(PPDMINETWORKCONNECTOR pInterface, bool fPromiscuous)
188	{
189	LogFlow(("drvNATSetPromiscuousMode: fPromiscuous=%d\n", fPromiscuous));
190	/* nothing to do */
191	}
192
193	/**
194	* Worker function for drvNATNotifyLinkChanged().
195	* @thread "NAT" thread.
196	*/
197	static void drvNATNotifyLinkChangedWorker(PDRVNAT pThis, PDMNETWORKLINKSTATE enmLinkState)
198	{
199	pThis->enmLinkState = enmLinkState;
200
201	switch (enmLinkState)
202	{
203	case PDMNETWORKLINKSTATE_UP:
204	LogRel(("NAT: link up\n"));
205	slirp_link_up(pThis->pNATState);
206	break;
207
208	case PDMNETWORKLINKSTATE_DOWN:
209	case PDMNETWORKLINKSTATE_DOWN_RESUME:
210	LogRel(("NAT: link down\n"));
211	slirp_link_down(pThis->pNATState);
212	break;
213
214	default:
215	AssertMsgFailed(("drvNATNotifyLinkChanged: unexpected link state %d\n", enmLinkState));
216	}
217	}
218
219	/**
220	* Notification on link status changes.
221	*
222	* @param pInterface Pointer to the interface structure containing the called function pointer.
223	* @param enmLinkState The new link state.
224	* @thread EMT
225	*/
226	static DECLCALLBACK(void) drvNATNotifyLinkChanged(PPDMINETWORKCONNECTOR pInterface, PDMNETWORKLINKSTATE enmLinkState)
227	{
228	PDRVNAT pThis = PDMINETWORKCONNECTOR_2_DRVNAT(pInterface);
229
230	LogFlow(("drvNATNotifyLinkChanged: enmLinkState=%d\n", enmLinkState));
231
232	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
233
234	PRTREQ pReq = NULL;
235	/* don't queue new requests when the NAT thread is about to stop */
236	if (pThis->pThread->enmState != PDMTHREADSTATE_RUNNING)
237	return;
238	int rc = RTReqAlloc(pThis->pReqQueue, &pReq, RTREQTYPE_INTERNAL);
239	AssertReleaseRC(rc);
240	pReq->u.Internal.pfn = (PFNRT)drvNATNotifyLinkChangedWorker;
241	pReq->u.Internal.cArgs = 2;
242	pReq->u.Internal.aArgs[0] = (uintptr_t)pThis;
243	pReq->u.Internal.aArgs[1] = (uintptr_t)enmLinkState;
244	pReq->fFlags = RTREQFLAGS_VOID;
245	rc = RTReqQueue(pReq, 0); /* don't wait, we have to wakeup the NAT thread fist */
246	if (RT_LIKELY(rc == VERR_TIMEOUT))
247	{
248	# ifndef RT_OS_WINDOWS
249	/* kick select() */
250	rc = RTFileWrite(pThis->PipeWrite, "", 1, NULL);
251	AssertRC(rc);
252	# else
253	/* kick WSAWaitForMultipleEvents() */
254	rc = WSASetEvent(pThis->hWakeupEvent);
255	AssertRelease(rc == TRUE);
256	# endif
257	rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
258	AssertReleaseRC(rc);
259	}
260	else
261	AssertReleaseRC(rc);
262	RTReqFree(pReq);
263
264	#else /* !VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
265
266	int rc = RTCritSectEnter(&pThis->CritSect);
267	AssertReleaseRC(rc);
268	drvNATNotifyLinkChangedWorker(pThis, enmLinkState);
269	RTCritSectLeave(&pThis->CritSect);
270
271	#endif /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
272	}
273
274
275	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
276
277	/**
278	* Poller callback.
279	*/
280	static DECLCALLBACK(void) drvNATPoller(PPDMDRVINS pDrvIns)
281	{
282	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
283	fd_set ReadFDs;
284	fd_set WriteFDs;
285	fd_set XcptFDs;
286	int nFDs = -1;
287	FD_ZERO(&ReadFDs);
288	FD_ZERO(&WriteFDs);
289	FD_ZERO(&XcptFDs);
290
291	int rc = RTCritSectEnter(&pThis->CritSect);
292	AssertReleaseRC(rc);
293
294	slirp_select_fill(pThis->pNATState, &nFDs, &ReadFDs, &WriteFDs, &XcptFDs);
295
296	struct timeval tv = {0, 0}; /* no wait */
297	int cChangedFDs = select(nFDs + 1, &ReadFDs, &WriteFDs, &XcptFDs, &tv);
298	if (cChangedFDs >= 0)
299	slirp_select_poll(pThis->pNATState, &ReadFDs, &WriteFDs, &XcptFDs);
300
301	RTCritSectLeave(&pThis->CritSect);
302	}
303
304	#else /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
305
306	static DECLCALLBACK(int) drvNATAsyncIoThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
307	{
308	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
309	fd_set ReadFDs;
310	fd_set WriteFDs;
311	fd_set XcptFDs;
312	int nFDs = -1;
313	unsigned int ms;
314	# ifdef RT_OS_WINDOWS
315	DWORD event;
316	HANDLE *phEvents;
317	# endif
318
319	LogFlow(("drvNATAsyncIoThread: pThis=%p\n", pThis));
320
321	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
322	return VINF_SUCCESS;
323
324	#ifdef RT_OS_WINDOWS
325	phEvents = slirp_get_events(pThis->pNATState);
326	#endif
327
328	/*
329	* Polling loop.
330	*/
331	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
332	{
333	FD_ZERO(&ReadFDs);
334	FD_ZERO(&WriteFDs);
335	FD_ZERO(&XcptFDs);
336	nFDs = -1;
337
338	/*
339	* To prevent concurent execution of sending/receving threads
340	*/
341	slirp_select_fill(pThis->pNATState, &nFDs, &ReadFDs, &WriteFDs, &XcptFDs);
342	ms = slirp_get_timeout_ms(pThis->pNATState);
343	# ifndef RT_OS_WINDOWS
344	struct timeval tv = { 0, ms*1000 };
345	FD_SET(pThis->PipeRead, &ReadFDs);
346	nFDs = ((int)pThis->PipeRead < nFDs ? nFDs : pThis->PipeRead);
347	int cChangedFDs = select(nFDs + 1, &ReadFDs, &WriteFDs, &XcptFDs, ms ? &tv : NULL);
348	if (cChangedFDs >= 0)
349	{
350	slirp_select_poll(pThis->pNATState, &ReadFDs, &WriteFDs, &XcptFDs);
351	if (FD_ISSET(pThis->PipeRead, &ReadFDs))
352	{
353	/* drain the pipe */
354	char ch[1];
355	size_t cbRead;
356	RTFileRead(pThis->PipeRead, &ch, 1, &cbRead);
357	}
358	/* process _all_ outstanding requests but don't wait */
359	RTReqProcess(pThis->pReqQueue, 0);
360	}
361	# else /* RT_OS_WINDOWS */
362	event = WSAWaitForMultipleEvents(nFDs, phEvents, FALSE, ms ? ms : WSA_INFINITE, FALSE);
363	if ( (event < WSA_WAIT_EVENT_0 \|\| event > WSA_WAIT_EVENT_0 + nFDs - 1)
364	&& event != WSA_WAIT_TIMEOUT)
365	{
366	int error = WSAGetLastError();
367	LogRel(("WSAWaitForMultipleEvents returned %d (error %d)\n", event, error));
368	RTAssertReleasePanic();
369	}
370
371	if (event == WSA_WAIT_TIMEOUT)
372	{
373	/* only check for slow/fast timers */
374	slirp_select_poll(pThis->pNATState, NULL, NULL, NULL);
375	continue;
376	}
377
378	/* poll the sockets in any case */
379	slirp_select_poll(pThis->pNATState, &ReadFDs, &WriteFDs, &XcptFDs);
380	/* process _all_ outstanding requests but don't wait */
381	RTReqProcess(pThis->pReqQueue, 0);
382	# endif /* RT_OS_WINDOWS */
383	}
384
385	return VINF_SUCCESS;
386	}
387
388	/**
389	* Unblock the send thread so it can respond to a state change.
390	*
391	* @returns VBox status code.
392	* @param pDevIns The pcnet device instance.
393	* @param pThread The send thread.
394	*/
395	static DECLCALLBACK(int) drvNATAsyncIoWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
396	{
397	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
398
399	# ifndef RT_OS_WINDOWS
400	/* kick select() */
401	int rc = RTFileWrite(pThis->PipeWrite, "", 1, NULL);
402	AssertRC(rc);
403	# else
404	/* kick WSAWaitForMultipleEvents() */
405	WSASetEvent(pThis->hWakeupEvent);
406	# endif
407
408	return VINF_SUCCESS;
409	}
410
411	#endif /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
412
413
414	/**
415	* Function called by slirp to check if it's possible to feed incoming data to the network port.
416	* @returns 1 if possible.
417	* @returns 0 if not possible.
418	*/
419	int slirp_can_output(void *pvUser)
420	{
421	PDRVNAT pThis = (PDRVNAT)pvUser;
422
423	Assert(pThis);
424
425	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
426	/** Happens during termination */
427	if (!RTCritSectIsOwner(&pThis->CritSect))
428	return 0;
429	#endif
430
431	int rc = pThis->pPort->pfnWaitReceiveAvail(pThis->pPort, 0);
432	return RT_SUCCESS(rc);
433	}
434
435
436	/**
437	* Function called by slirp to feed incoming data to the network port.
438	*/
439	void slirp_output(void pvUser, const uint8_t pu8Buf, int cb)
440	{
441	PDRVNAT pThis = (PDRVNAT)pvUser;
442
443	LogFlow(("slirp_output BEGIN %x %d\n", pu8Buf, cb));
444	Log2(("slirp_output: pu8Buf=%p cb=%#x (pThis=%p)\n%.*Rhxd\n", pu8Buf, cb, pThis, cb, pu8Buf));
445
446	Assert(pThis);
447
448	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
449	/** Happens during termination */
450	if (!RTCritSectIsOwner(&pThis->CritSect))
451	return;
452	#endif
453
454	int rc = pThis->pPort->pfnReceive(pThis->pPort, pu8Buf, cb);
455	AssertRC(rc);
456	LogFlow(("slirp_output END %x %d\n", pu8Buf, cb));
457	}
458
459	/**
460	* Queries an interface to the driver.
461	*
462	* @returns Pointer to interface.
463	* @returns NULL if the interface was not supported by the driver.
464	* @param pInterface Pointer to this interface structure.
465	* @param enmInterface The requested interface identification.
466	* @thread Any thread.
467	*/
468	static DECLCALLBACK(void *) drvNATQueryInterface(PPDMIBASE pInterface, PDMINTERFACE enmInterface)
469	{
470	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
471	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
472	switch (enmInterface)
473	{
474	case PDMINTERFACE_BASE:
475	return &pDrvIns->IBase;
476	case PDMINTERFACE_NETWORK_CONNECTOR:
477	return &pThis->INetworkConnector;
478	default:
479	return NULL;
480	}
481	}
482
483
484	/**
485	* Destruct a driver instance.
486	*
487	* Most VM resources are freed by the VM. This callback is provided so that any non-VM
488	* resources can be freed correctly.
489	*
490	* @param pDrvIns The driver instance data.
491	*/
492	static DECLCALLBACK(void) drvNATDestruct(PPDMDRVINS pDrvIns)
493	{
494	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
495
496	LogFlow(("drvNATDestruct:\n"));
497
498	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
499	int rc = RTCritSectEnter(&pThis->CritSect);
500	AssertReleaseRC(rc);
501	#endif
502	slirp_term(pThis->pNATState);
503	pThis->pNATState = NULL;
504	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
505	RTCritSectLeave(&pThis->CritSect);
506	RTCritSectDelete(&pThis->CritSect);
507	#endif
508	}
509
510
511	/**
512	* Sets up the redirectors.
513	*
514	* @returns VBox status code.
515	* @param pCfgHandle The drivers configuration handle.
516	*/
517	static int drvNATConstructRedir(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pCfgHandle, RTIPV4ADDR Network)
518	{
519	/*
520	* Enumerate redirections.
521	*/
522	for (PCFGMNODE pNode = CFGMR3GetFirstChild(pCfgHandle); pNode; pNode = CFGMR3GetNextChild(pNode))
523	{
524	/*
525	* Validate the port forwarding config.
526	*/
527	if (!CFGMR3AreValuesValid(pNode, "Protocol\0UDP\0HostPort\0GuestPort\0GuestIP\0"))
528	return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES, N_("Unknown configuration in port forwarding"));
529
530	/* protocol type */
531	bool fUDP;
532	char szProtocol[32];
533	int rc = CFGMR3QueryString(pNode, "Protocol", &szProtocol[0], sizeof(szProtocol));
534	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
535	{
536	rc = CFGMR3QueryBool(pNode, "UDP", &fUDP);
537	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
538	fUDP = false;
539	else if (RT_FAILURE(rc))
540	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"UDP\" boolean failed"), iInstance);
541	}
542	else if (RT_SUCCESS(rc))
543	{
544	if (!RTStrICmp(szProtocol, "TCP"))
545	fUDP = false;
546	else if (!RTStrICmp(szProtocol, "UDP"))
547	fUDP = true;
548	else
549	return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("NAT#%d: Invalid configuration value for \"Protocol\": \"%s\""), iInstance, szProtocol);
550	}
551	else
552	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"Protocol\" string failed"), iInstance);
553
554	/* host port */
555	int32_t iHostPort;
556	rc = CFGMR3QueryS32(pNode, "HostPort", &iHostPort);
557	if (RT_FAILURE(rc))
558	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"HostPort\" integer failed"), iInstance);
559
560	/* guest port */
561	int32_t iGuestPort;
562	rc = CFGMR3QueryS32(pNode, "GuestPort", &iGuestPort);
563	if (RT_FAILURE(rc))
564	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"GuestPort\" integer failed"), iInstance);
565
566	/* guest address */
567	char szGuestIP[32];
568	rc = CFGMR3QueryString(pNode, "GuestIP", &szGuestIP[0], sizeof(szGuestIP));
569	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
570	RTStrPrintf(szGuestIP, sizeof(szGuestIP), "%d.%d.%d.%d",
571	(Network & 0xFF000000) >> 24, (Network & 0xFF0000) >> 16, (Network & 0xFF00) >> 8, (Network & 0xE0) \| 15);
572	else if (RT_FAILURE(rc))
573	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"GuestIP\" string failed"), iInstance);
574	struct in_addr GuestIP;
575	if (!inet_aton(szGuestIP, &GuestIP))
576	return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_GUEST_IP, RT_SRC_POS,
577	N_("NAT#%d: configuration error: invalid \"GuestIP\"=\"%s\", inet_aton failed"), iInstance, szGuestIP);
578
579	/*
580	* Call slirp about it.
581	*/
582	Log(("drvNATConstruct: Redir %d -> %s:%d\n", iHostPort, szGuestIP, iGuestPort));
583	if (slirp_redir(pThis->pNATState, fUDP, iHostPort, GuestIP, iGuestPort) < 0)
584	return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_SETUP, RT_SRC_POS,
585	N_("NAT#%d: configuration error: failed to set up redirection of %d to %s:%d. Probably a conflict with existing services or other rules"), iInstance, iHostPort, szGuestIP, iGuestPort);
586	} /* for each redir rule */
587
588	return VINF_SUCCESS;
589	}
590
591	/**
592	* Get the MAC address into the slirp stack.
593	*/
594	static void drvNATSetMac(PDRVNAT pThis)
595	{
596	if (pThis->pConfig)
597	{
598	RTMAC Mac;
599	pThis->pConfig->pfnGetMac(pThis->pConfig, &Mac);
600	slirp_set_ethaddr(pThis->pNATState, Mac.au8);
601	}
602	}
603
604
605	/**
606	* After loading we have to pass the MAC address of the ethernet device to the slirp stack.
607	* Otherwise the guest is not reachable until it performs a DHCP request or an ARP request
608	* (usually done during guest boot).
609	*/
610	static DECLCALLBACK(int) drvNATLoadDone(PPDMDRVINS pDrvIns, PSSMHANDLE pSSMHandle)
611	{
612	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
613	drvNATSetMac(pThis);
614	return VINF_SUCCESS;
615	}
616
617
618	/**
619	* Some guests might not use DHCP to retrieve an IP but use a static IP.
620	*/
621	static DECLCALLBACK(void) drvNATPowerOn(PPDMDRVINS pDrvIns)
622	{
623	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
624	drvNATSetMac(pThis);
625	}
626
627
628	/**
629	* Construct a NAT network transport driver instance.
630	*
631	* @returns VBox status.
632	* @param pDrvIns The driver instance data.
633	* If the registration structure is needed, pDrvIns->pDrvReg points to it.
634	* @param pCfgHandle Configuration node handle for the driver. Use this to obtain the configuration
635	* of the driver instance. It's also found in pDrvIns->pCfgHandle, but like
636	* iInstance it's expected to be used a bit in this function.
637	*/
638	static DECLCALLBACK(int) drvNATConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfgHandle)
639	{
640	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
641	char szNetAddr[16];
642	char szNetwork[32]; /* xxx.xxx.xxx.xxx/yy */
643	LogFlow(("drvNATConstruct:\n"));
644
645	/*
646	* Validate the config.
647	*/
648	if (!CFGMR3AreValuesValid(pCfgHandle, "PassDomain\0TFTPPrefix\0BootFile\0Network\0"))
649	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES, N_("Unknown NAT configuration option, only supports PassDomain, TFTPPrefix, BootFile and Network"));
650
651	/*
652	* Init the static parts.
653	*/
654	pThis->pDrvIns = pDrvIns;
655	pThis->pNATState = NULL;
656	pThis->pszTFTPPrefix = NULL;
657	pThis->pszBootFile = NULL;
658	/* IBase */
659	pDrvIns->IBase.pfnQueryInterface = drvNATQueryInterface;
660	/* INetwork */
661	pThis->INetworkConnector.pfnSend = drvNATSend;
662	pThis->INetworkConnector.pfnSetPromiscuousMode = drvNATSetPromiscuousMode;
663	pThis->INetworkConnector.pfnNotifyLinkChanged = drvNATNotifyLinkChanged;
664
665	/*
666	* Get the configuration settings.
667	*/
668	bool fPassDomain = true;
669	int rc = CFGMR3QueryBool(pCfgHandle, "PassDomain", &fPassDomain);
670	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
671	fPassDomain = true;
672	else if (RT_FAILURE(rc))
673	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"PassDomain\" boolean failed"), pDrvIns->iInstance);
674
675	rc = CFGMR3QueryStringAlloc(pCfgHandle, "TFTPPrefix", &pThis->pszTFTPPrefix);
676	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND)
677	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"TFTPPrefix\" string failed"), pDrvIns->iInstance);
678	rc = CFGMR3QueryStringAlloc(pCfgHandle, "BootFile", &pThis->pszBootFile);
679	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND)
680	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"BootFile\" string failed"), pDrvIns->iInstance);
681
682	/*
683	* Query the network port interface.
684	*/
685	pThis->pPort = (PPDMINETWORKPORT)pDrvIns->pUpBase->pfnQueryInterface(pDrvIns->pUpBase, PDMINTERFACE_NETWORK_PORT);
686	if (!pThis->pPort)
687	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
688	N_("Configuration error: the above device/driver didn't export the network port interface"));
689	pThis->pConfig = (PPDMINETWORKCONFIG)pDrvIns->pUpBase->pfnQueryInterface(pDrvIns->pUpBase, PDMINTERFACE_NETWORK_CONFIG);
690	if (!pThis->pConfig)
691	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
692	N_("Configuration error: the above device/driver didn't export the network config interface"));
693
694	/* Generate a network address for this network card. */
695	rc = CFGMR3QueryString(pCfgHandle, "Network", szNetwork, sizeof(szNetwork));
696	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
697	RTStrPrintf(szNetwork, sizeof(szNetwork), "10.0.%d.0/24", pDrvIns->iInstance + 2);
698	else if (RT_FAILURE(rc))
699	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"Network\" string failed"), pDrvIns->iInstance);
700
701	RTIPV4ADDR Network;
702	RTIPV4ADDR Netmask;
703	rc = RTCidrStrToIPv4(szNetwork, &Network, &Netmask);
704	if (RT_FAILURE(rc))
705	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: Configuration error: network '%s' describes not a valid IPv4 network"), pDrvIns->iInstance, szNetwork);
706
707	RTStrPrintf(szNetAddr, sizeof(szNetAddr), "%d.%d.%d.%d",
708	(Network & 0xFF000000) >> 24, (Network & 0xFF0000) >> 16, (Network & 0xFF00) >> 8, Network & 0xFF);
709
710	/*
711	* The slirp lock..
712	*/
713	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
714	rc = RTCritSectInit(&pThis->CritSect);
715	if (RT_FAILURE(rc))
716	return rc;
717	#endif
718	/*
719	* Initialize slirp.
720	*/
721	rc = slirp_init(&pThis->pNATState, &szNetAddr[0], Netmask, fPassDomain, pThis->pszTFTPPrefix, pThis->pszBootFile, pThis);
722	if (RT_SUCCESS(rc))
723	{
724	slirp_register_timers(pThis->pNATState, pDrvIns);
725	int rc2 = drvNATConstructRedir(pDrvIns->iInstance, pThis, pCfgHandle, Network);
726	if (RT_SUCCESS(rc2))
727	{
728	/*
729	* Register a load done notification to get the MAC address into the slirp
730	* engine after we loaded a guest state.
731	*/
732	rc2 = PDMDrvHlpSSMRegister(pDrvIns, pDrvIns->pDrvReg->szDriverName,
733	pDrvIns->iInstance, 0, 0,
734	NULL, NULL, NULL, NULL, NULL, drvNATLoadDone);
735	AssertRC(rc2);
736	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
737	pDrvIns->pDrvHlp->pfnPDMPollerRegister(pDrvIns, drvNATPoller);
738	#else
739	rc = RTReqCreateQueue(&pThis->pReqQueue);
740	if (RT_FAILURE(rc))
741	return rc;
742
743	# ifndef RT_OS_WINDOWS
744	/*
745	* Create the control pipe.
746	*/
747	int fds[2];
748	if (pipe(&fds[0]) != 0) /** @todo RTPipeCreate() or something... */
749	{
750	int rc = RTErrConvertFromErrno(errno);
751	AssertRC(rc);
752	return rc;
753	}
754	pThis->PipeRead = fds[0];
755	pThis->PipeWrite = fds[1];
756	# else
757	pThis->hWakeupEvent = CreateEvent(NULL, FALSE, FALSE, NULL); /* auto-reset event */
758	slirp_register_external_event(pThis->pNATState, pThis->hWakeupEvent, VBOX_WAKEUP_EVENT_INDEX);
759	# endif
760
761	rc = PDMDrvHlpPDMThreadCreate(pDrvIns, &pThis->pThread, pThis, drvNATAsyncIoThread, drvNATAsyncIoWakeup, 128 * _1K, RTTHREADTYPE_IO, "NAT");
762	AssertReleaseRC(rc);
763	#endif
764
765	pThis->enmLinkState = PDMNETWORKLINKSTATE_UP;
766
767	/* might return VINF_NAT_DNS */
768	return rc;
769	}
770	/* failure path */
771	rc = rc2;
772	slirp_term(pThis->pNATState);
773	pThis->pNATState = NULL;
774	}
775	else
776	{
777	PDMDRV_SET_ERROR(pDrvIns, rc, N_("Unknown error during NAT networking setup: "));
778	AssertMsgFailed(("Add error message for rc=%d (%Rrc)\n", rc, rc));
779	}
780
781	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
782	RTCritSectDelete(&pThis->CritSect);
783	#endif
784	return rc;
785	}
786
787
788	/**
789	* NAT network transport driver registration record.
790	*/
791	const PDMDRVREG g_DrvNAT =
792	{
793	/* u32Version */
794	PDM_DRVREG_VERSION,
795	/* szDriverName */
796	"NAT",
797	/* pszDescription */
798	"NAT Network Transport Driver",
799	/* fFlags */
800	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
801	/* fClass. */
802	PDM_DRVREG_CLASS_NETWORK,
803	/* cMaxInstances */
804	16,
805	/* cbInstance */
806	sizeof(DRVNAT),
807	/* pfnConstruct */
808	drvNATConstruct,
809	/* pfnDestruct */
810	drvNATDestruct,
811	/* pfnIOCtl */
812	NULL,
813	/* pfnPowerOn */
814	drvNATPowerOn,
815	/* pfnReset */
816	NULL,
817	/* pfnSuspend */
818	NULL,
819	/* pfnResume */
820	NULL,
821	/* pfnDetach */
822	NULL,
823	/* pfnPowerOff */
824	NULL
825	};

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source: vbox/trunk/src/VBox/Devices/Network/DrvNAT.cpp@ 15209

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