DrvNAT.cpp@ 13986

Last change on this file since 13986 was 13986, checked in by vboxsync, 16 years ago
NAT: simplified synchronization
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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_SIMPLEFIED_SLIRP_SYNC
42	# include <unistd.h>
43	# include <errno.h>
44	# include<iprt/semaphore.h>
45	#endif
46
47
48	/*******************************************************************************
49	* Structures and Typedefs *
50	*******************************************************************************/
51	/**
52	* NAT network transport driver instance data.
53	*/
54	typedef struct DRVNAT
55	{
56	/** The network interface. */
57	PDMINETWORKCONNECTOR INetworkConnector;
58	/** The port we're attached to. */
59	PPDMINETWORKPORT pPort;
60	/** The network config of the port we're attached to. */
61	PPDMINETWORKCONFIG pConfig;
62	/** Pointer to the driver instance. */
63	PPDMDRVINS pDrvIns;
64	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
65	/** Slirp critical section. */
66	RTCRITSECT CritSect;
67	#endif
68	/** Link state */
69	PDMNETWORKLINKSTATE enmLinkState;
70	/** NAT state for this instance. */
71	PNATState pNATState;
72	/** TFTP directory prefix. */
73	char *pszTFTPPrefix;
74	/** Boot file name to provide in the DHCP server response. */
75	char *pszBootFile;
76	#ifdef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
77	/polling thread/
78	PPDMTHREAD pThread;
79	/used for wakep of poling thread/
80	RTSEMEVENT semSndMutex;
81	#ifndef RT_OS_WINDOWS
82	/** The write end of the control pipe. */
83	RTFILE PipeWrite;
84	/** The read end of the control pipe. */
85	RTFILE PipeRead;
86	#else
87	#endif
88	/** Send buffer */
89	char cBuffer[1600];
90	size_t sBufferSize;
91	#endif
92	} DRVNAT, *PDRVNAT;
93
94	/** Converts a pointer to NAT::INetworkConnector to a PRDVNAT. */
95	#define PDMINETWORKCONNECTOR_2_DRVNAT(pInterface) ( (PDRVNAT)((uintptr_t)pInterface - RT_OFFSETOF(DRVNAT, INetworkConnector)) )
96
97
98
99	/**
100	* Send data to the network.
101	*
102	* @returns VBox status code.
103	* @param pInterface Pointer to the interface structure containing the called function pointer.
104	* @param pvBuf Data to send.
105	* @param cb Number of bytes to send.
106	* @thread EMT
107	*/
108	static DECLCALLBACK(int) drvNATSend(PPDMINETWORKCONNECTOR pInterface, const void *pvBuf, size_t cb)
109	{
110	PDRVNAT pThis = PDMINETWORKCONNECTOR_2_DRVNAT(pInterface);
111
112	LogFlow(("drvNATSend: pvBuf=%p cb=%#x\n", pvBuf, cb));
113	Log2(("drvNATSend: pvBuf=%p cb=%#x\n%.*Rhxd\n", pvBuf, cb, cb, pvBuf));
114
115	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
116	int rc = RTCritSectEnter(&pThis->CritSect);
117	AssertReleaseRC(rc);
118	#else
119	/notify select to wakeup/
120	memcpy(pThis->cBuffer,pvBuf, cb);
121	pThis->sBufferSize = cb;
122	int rc = RTFileWrite(pThis->PipeWrite, "1", 2, NULL);
123	AssertRC(rc);
124	RTSemEventWait(pThis->semSndMutex, RT_INDEFINITE_WAIT);
125	#endif
126
127	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
128	Assert(pThis->enmLinkState == PDMNETWORKLINKSTATE_UP);
129	if (pThis->enmLinkState == PDMNETWORKLINKSTATE_UP) {
130	slirp_input(pThis->pNATState, (uint8_t *)pvBuf, cb);
131	}
132	RTCritSectLeave(&pThis->CritSect);
133	#endif
134	LogFlow(("drvNATSend: end\n"));
135	return VINF_SUCCESS;
136	}
137
138
139	/**
140	* Set promiscuous mode.
141	*
142	* This is called when the promiscuous mode is set. This means that there doesn't have
143	* to be a mode change when it's called.
144	*
145	* @param pInterface Pointer to the interface structure containing the called function pointer.
146	* @param fPromiscuous Set if the adaptor is now in promiscuous mode. Clear if it is not.
147	* @thread EMT
148	*/
149	static DECLCALLBACK(void) drvNATSetPromiscuousMode(PPDMINETWORKCONNECTOR pInterface, bool fPromiscuous)
150	{
151	LogFlow(("drvNATSetPromiscuousMode: fPromiscuous=%d\n", fPromiscuous));
152	/* nothing to do */
153	}
154
155
156	/**
157	* Notification on link status changes.
158	*
159	* @param pInterface Pointer to the interface structure containing the called function pointer.
160	* @param enmLinkState The new link state.
161	* @thread EMT
162	*/
163	static DECLCALLBACK(void) drvNATNotifyLinkChanged(PPDMINETWORKCONNECTOR pInterface, PDMNETWORKLINKSTATE enmLinkState)
164	{
165	PDRVNAT pThis = PDMINETWORKCONNECTOR_2_DRVNAT(pInterface);
166
167	LogFlow(("drvNATNotifyLinkChanged: enmLinkState=%d\n", enmLinkState));
168
169	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
170	int rc = RTCritSectEnter(&pThis->CritSect);
171	AssertReleaseRC(rc);
172	#endif
173	pThis->enmLinkState = enmLinkState;
174
175	switch (enmLinkState)
176	{
177	case PDMNETWORKLINKSTATE_UP:
178	LogRel(("NAT: link up\n"));
179	slirp_link_up(pThis->pNATState);
180	break;
181
182	case PDMNETWORKLINKSTATE_DOWN:
183	case PDMNETWORKLINKSTATE_DOWN_RESUME:
184	LogRel(("NAT: link down\n"));
185	slirp_link_down(pThis->pNATState);
186	break;
187
188	default:
189	AssertMsgFailed(("drvNATNotifyLinkChanged: unexpected link state %d\n", enmLinkState));
190	}
191	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
192	RTCritSectLeave(&pThis->CritSect);
193	#endif
194	}
195
196
197	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
198	/**
199	* Poller callback.
200	*/
201	static DECLCALLBACK(void) drvNATPoller(PPDMDRVINS pDrvIns)
202	{
203	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
204	fd_set ReadFDs;
205	fd_set WriteFDs;
206	fd_set XcptFDs;
207	int cFDs = -1;
208	FD_ZERO(&ReadFDs);
209	FD_ZERO(&WriteFDs);
210	FD_ZERO(&XcptFDs);
211
212	int rc = RTCritSectEnter(&pThis->CritSect);
213	AssertReleaseRC(rc);
214
215	slirp_select_fill(pThis->pNATState, &cFDs, &ReadFDs, &WriteFDs, &XcptFDs);
216
217	struct timeval tv = {0, 0}; /* no wait */
218	int cReadFDs = select(cFDs + 1, &ReadFDs, &WriteFDs, &XcptFDs, &tv);
219	if (cReadFDs >= 0)
220	slirp_select_poll(pThis->pNATState, &ReadFDs, &WriteFDs, &XcptFDs);
221
222	RTCritSectLeave(&pThis->CritSect);
223	}
224	#else
225
226	static DECLCALLBACK(int) drvNATAsyncIoThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
227	{
228	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
229	fd_set ReadFDs;
230	fd_set WriteFDs;
231	fd_set XcptFDs;
232	int cFDs = -1;
233	int rc;
234
235	LogFlow(("drvNATAsyncIoThread: pThis=%p\n", pThis));
236
237	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
238	return VINF_SUCCESS;
239
240	/*
241	* Polling loop.
242	*/
243	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
244	{
245	FD_ZERO(&ReadFDs);
246	FD_ZERO(&WriteFDs);
247	FD_ZERO(&XcptFDs);
248	cFDs = -1;
249
250	/*
251	* To prevent concurent execution of sending/receving threads
252	*/
253	slirp_select_fill(pThis->pNATState, &cFDs, &ReadFDs, &WriteFDs, &XcptFDs);
254
255	struct timeval tv = {0, 2000}; /* 2ms for the fast timer */
256
257	FD_SET(pThis->PipeRead, &ReadFDs); /* Linux only */
258	cFDs = ((int)pThis->PipeRead < cFDs ? cFDs:pThis->PipeRead);
259	int cReadFDs = select(cFDs + 1, &ReadFDs, &WriteFDs, &XcptFDs, &tv);
260	if (cReadFDs >= 0)
261	{
262	slirp_select_poll(pThis->pNATState, &ReadFDs, &WriteFDs, &XcptFDs);
263
264	if (FD_ISSET(pThis->PipeRead, &ReadFDs))
265	{
266	/* drain the pipe */
267	char ch[2];
268	size_t cbRead;
269	RTFileRead(pThis->PipeRead, &ch, 2, &cbRead);
270	switch (ch[0])
271	{
272	case '1':
273	slirp_input(pThis->pNATState, (uint8_t *)pThis->cBuffer, pThis->sBufferSize);
274	RTSemEventSignal(pThis->semSndMutex);
275	break;
276	case '2':
277	break;
278	}
279	}
280	}
281	}
282
283	return VINF_SUCCESS;
284	}
285
286	/**
287	* Unblock the send thread so it can respond to a state change.
288	*
289	* @returns VBox status code.
290	* @param pDevIns The pcnet device instance.
291	* @param pThread The send thread.
292	*/
293	static DECLCALLBACK(int) drvNATAsyncIoWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
294	{
295	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
296
297	int rc = RTFileWrite(pThis->PipeWrite, "2", 2, NULL);
298	AssertRC(rc);
299	RTSemEventSignal(pThis->semSndMutex);
300	return VINF_SUCCESS;
301	}
302
303	#endif
304
305	/**
306	* Function called by slirp to check if it's possible to feed incoming data to the network port.
307	* @returns 1 if possible.
308	* @returns 0 if not possible.
309	*/
310	int slirp_can_output(void *pvUser)
311	{
312	PDRVNAT pThis = (PDRVNAT)pvUser;
313
314	Assert(pThis);
315
316	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
317	/** Happens during termination */
318	if (!RTCritSectIsOwner(&pThis->CritSect))
319	return 0;
320	#endif
321
322	int rc = pThis->pPort->pfnWaitReceiveAvail(pThis->pPort, 0);
323	return RT_SUCCESS(rc);
324	}
325
326
327	/**
328	* Function called by slirp to feed incoming data to the network port.
329	*/
330	void slirp_output(void pvUser, const uint8_t pu8Buf, int cb)
331	{
332	PDRVNAT pThis = (PDRVNAT)pvUser;
333
334	LogFlow(("slirp_output BEGIN %x %d\n", pu8Buf, cb));
335	Log2(("slirp_output: pu8Buf=%p cb=%#x (pThis=%p)\n%.*Rhxd\n", pu8Buf, cb, pThis, cb, pu8Buf));
336
337	Assert(pThis);
338
339	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
340	/** Happens during termination */
341	if (!RTCritSectIsOwner(&pThis->CritSect))
342	return;
343	#endif
344
345	int rc = pThis->pPort->pfnReceive(pThis->pPort, pu8Buf, cb);
346	AssertRC(rc);
347	LogFlow(("slirp_output END %x %d\n", pu8Buf, cb));
348	}
349
350	/**
351	* Queries an interface to the driver.
352	*
353	* @returns Pointer to interface.
354	* @returns NULL if the interface was not supported by the driver.
355	* @param pInterface Pointer to this interface structure.
356	* @param enmInterface The requested interface identification.
357	* @thread Any thread.
358	*/
359	static DECLCALLBACK(void *) drvNATQueryInterface(PPDMIBASE pInterface, PDMINTERFACE enmInterface)
360	{
361	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
362	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
363	switch (enmInterface)
364	{
365	case PDMINTERFACE_BASE:
366	return &pDrvIns->IBase;
367	case PDMINTERFACE_NETWORK_CONNECTOR:
368	return &pThis->INetworkConnector;
369	default:
370	return NULL;
371	}
372	}
373
374
375	/**
376	* Destruct a driver instance.
377	*
378	* Most VM resources are freed by the VM. This callback is provided so that any non-VM
379	* resources can be freed correctly.
380	*
381	* @param pDrvIns The driver instance data.
382	*/
383	static DECLCALLBACK(void) drvNATDestruct(PPDMDRVINS pDrvIns)
384	{
385	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
386
387	LogFlow(("drvNATDestruct:\n"));
388
389	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
390	int rc = RTCritSectEnter(&pThis->CritSect);
391	AssertReleaseRC(rc);
392	#endif
393	slirp_term(pThis->pNATState);
394	pThis->pNATState = NULL;
395	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
396	RTCritSectLeave(&pThis->CritSect);
397
398	RTCritSectDelete(&pThis->CritSect);
399	#else
400	RTSemEventDestroy(pThis->semSndMutex);
401	#endif
402	}
403
404
405	/**
406	* Sets up the redirectors.
407	*
408	* @returns VBox status code.
409	* @param pCfgHandle The drivers configuration handle.
410	*/
411	static int drvNATConstructRedir(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pCfgHandle, RTIPV4ADDR Network)
412	{
413	/*
414	* Enumerate redirections.
415	*/
416	for (PCFGMNODE pNode = CFGMR3GetFirstChild(pCfgHandle); pNode; pNode = CFGMR3GetNextChild(pNode))
417	{
418	/*
419	* Validate the port forwarding config.
420	*/
421	if (!CFGMR3AreValuesValid(pNode, "Protocol\0UDP\0HostPort\0GuestPort\0GuestIP\0"))
422	return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES, N_("Unknown configuration in port forwarding"));
423
424	/* protocol type */
425	bool fUDP;
426	char szProtocol[32];
427	int rc = CFGMR3QueryString(pNode, "Protocol", &szProtocol[0], sizeof(szProtocol));
428	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
429	{
430	rc = CFGMR3QueryBool(pNode, "UDP", &fUDP);
431	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
432	fUDP = false;
433	else if (RT_FAILURE(rc))
434	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"UDP\" boolean failed"), iInstance);
435	}
436	else if (RT_SUCCESS(rc))
437	{
438	if (!RTStrICmp(szProtocol, "TCP"))
439	fUDP = false;
440	else if (!RTStrICmp(szProtocol, "UDP"))
441	fUDP = true;
442	else
443	return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("NAT#%d: Invalid configuration value for \"Protocol\": \"%s\""), iInstance, szProtocol);
444	}
445	else
446	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"Protocol\" string failed"), iInstance);
447
448	/* host port */
449	int32_t iHostPort;
450	rc = CFGMR3QueryS32(pNode, "HostPort", &iHostPort);
451	if (RT_FAILURE(rc))
452	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"HostPort\" integer failed"), iInstance);
453
454	/* guest port */
455	int32_t iGuestPort;
456	rc = CFGMR3QueryS32(pNode, "GuestPort", &iGuestPort);
457	if (RT_FAILURE(rc))
458	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"GuestPort\" integer failed"), iInstance);
459
460	/* guest address */
461	char szGuestIP[32];
462	rc = CFGMR3QueryString(pNode, "GuestIP", &szGuestIP[0], sizeof(szGuestIP));
463	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
464	RTStrPrintf(szGuestIP, sizeof(szGuestIP), "%d.%d.%d.%d",
465	(Network & 0xFF000000) >> 24, (Network & 0xFF0000) >> 16, (Network & 0xFF00) >> 8, (Network & 0xE0) \| 15);
466	else if (RT_FAILURE(rc))
467	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"GuestIP\" string failed"), iInstance);
468	struct in_addr GuestIP;
469	if (!inet_aton(szGuestIP, &GuestIP))
470	return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_GUEST_IP, RT_SRC_POS,
471	N_("NAT#%d: configuration error: invalid \"GuestIP\"=\"%s\", inet_aton failed"), iInstance, szGuestIP);
472
473	/*
474	* Call slirp about it.
475	*/
476	Log(("drvNATConstruct: Redir %d -> %s:%d\n", iHostPort, szGuestIP, iGuestPort));
477	if (slirp_redir(pThis->pNATState, fUDP, iHostPort, GuestIP, iGuestPort) < 0)
478	return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_SETUP, RT_SRC_POS,
479	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);
480	} /* for each redir rule */
481
482	return VINF_SUCCESS;
483	}
484
485	/**
486	* Get the MAC address into the slirp stack.
487	*/
488	static void drvNATSetMac(PDRVNAT pThis)
489	{
490	if (pThis->pConfig)
491	{
492	RTMAC Mac;
493	pThis->pConfig->pfnGetMac(pThis->pConfig, &Mac);
494	slirp_set_ethaddr(pThis->pNATState, Mac.au8);
495	}
496	}
497
498
499	/**
500	* After loading we have to pass the MAC address of the ethernet device to the slirp stack.
501	* Otherwise the guest is not reachable until it performs a DHCP request or an ARP request
502	* (usually done during guest boot).
503	*/
504	static DECLCALLBACK(int) drvNATLoadDone(PPDMDRVINS pDrvIns, PSSMHANDLE pSSMHandle)
505	{
506	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
507	drvNATSetMac(pThis);
508	return VINF_SUCCESS;
509	}
510
511
512	/**
513	* Some guests might not use DHCP to retrieve an IP but use a static IP.
514	*/
515	static DECLCALLBACK(void) drvNATPowerOn(PPDMDRVINS pDrvIns)
516	{
517	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
518	drvNATSetMac(pThis);
519	}
520
521
522	/**
523	* Construct a NAT network transport driver instance.
524	*
525	* @returns VBox status.
526	* @param pDrvIns The driver instance data.
527	* If the registration structure is needed, pDrvIns->pDrvReg points to it.
528	* @param pCfgHandle Configuration node handle for the driver. Use this to obtain the configuration
529	* of the driver instance. It's also found in pDrvIns->pCfgHandle, but like
530	* iInstance it's expected to be used a bit in this function.
531	*/
532	static DECLCALLBACK(int) drvNATConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfgHandle)
533	{
534	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
535	char szNetAddr[16];
536	char szNetwork[32]; /* xxx.xxx.xxx.xxx/yy */
537	LogFlow(("drvNATConstruct:\n"));
538
539	/*
540	* Validate the config.
541	*/
542	if (!CFGMR3AreValuesValid(pCfgHandle, "PassDomain\0TFTPPrefix\0BootFile\0Network\0"))
543	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES, N_("Unknown NAT configuration option, only supports PassDomain, TFTPPrefix, BootFile and Network"));
544
545	/*
546	* Init the static parts.
547	*/
548	pThis->pDrvIns = pDrvIns;
549	pThis->pNATState = NULL;
550	pThis->pszTFTPPrefix = NULL;
551	pThis->pszBootFile = NULL;
552	/* IBase */
553	pDrvIns->IBase.pfnQueryInterface = drvNATQueryInterface;
554	/* INetwork */
555	pThis->INetworkConnector.pfnSend = drvNATSend;
556	pThis->INetworkConnector.pfnSetPromiscuousMode = drvNATSetPromiscuousMode;
557	pThis->INetworkConnector.pfnNotifyLinkChanged = drvNATNotifyLinkChanged;
558
559	/*
560	* Get the configuration settings.
561	*/
562	bool fPassDomain = true;
563	int rc = CFGMR3QueryBool(pCfgHandle, "PassDomain", &fPassDomain);
564	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
565	fPassDomain = true;
566	else if (RT_FAILURE(rc))
567	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"PassDomain\" boolean failed"), pDrvIns->iInstance);
568
569	rc = CFGMR3QueryStringAlloc(pCfgHandle, "TFTPPrefix", &pThis->pszTFTPPrefix);
570	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND)
571	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"TFTPPrefix\" string failed"), pDrvIns->iInstance);
572	rc = CFGMR3QueryStringAlloc(pCfgHandle, "BootFile", &pThis->pszBootFile);
573	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND)
574	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"BootFile\" string failed"), pDrvIns->iInstance);
575
576	/*
577	* Query the network port interface.
578	*/
579	pThis->pPort = (PPDMINETWORKPORT)pDrvIns->pUpBase->pfnQueryInterface(pDrvIns->pUpBase, PDMINTERFACE_NETWORK_PORT);
580	if (!pThis->pPort)
581	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
582	N_("Configuration error: the above device/driver didn't export the network port interface"));
583	pThis->pConfig = (PPDMINETWORKCONFIG)pDrvIns->pUpBase->pfnQueryInterface(pDrvIns->pUpBase, PDMINTERFACE_NETWORK_CONFIG);
584	if (!pThis->pConfig)
585	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
586	N_("Configuration error: the above device/driver didn't export the network config interface"));
587
588	/* Generate a network address for this network card. */
589	rc = CFGMR3QueryString(pCfgHandle, "Network", szNetwork, sizeof(szNetwork));
590	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
591	RTStrPrintf(szNetwork, sizeof(szNetwork), "10.0.%d.0/24", pDrvIns->iInstance + 2);
592	else if (RT_FAILURE(rc))
593	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: configuration query for \"Network\" string failed"), pDrvIns->iInstance);
594
595	RTIPV4ADDR Network;
596	RTIPV4ADDR Netmask;
597	rc = RTCidrStrToIPv4(szNetwork, &Network, &Netmask);
598	if (RT_FAILURE(rc))
599	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: Configuration error: network '%s' describes not a valid IPv4 network"), pDrvIns->iInstance, szNetwork);
600
601	RTStrPrintf(szNetAddr, sizeof(szNetAddr), "%d.%d.%d.%d",
602	(Network & 0xFF000000) >> 24, (Network & 0xFF0000) >> 16, (Network & 0xFF00) >> 8, Network & 0xFF);
603
604	/*
605	* The slirp lock..
606	*/
607	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
608	rc = RTCritSectInit(&pThis->CritSect);
609	if (RT_FAILURE(rc))
610	return rc;
611	#endif
612	/*
613	* Initialize slirp.
614	*/
615	rc = slirp_init(&pThis->pNATState, &szNetAddr[0], Netmask, fPassDomain, pThis->pszTFTPPrefix, pThis->pszBootFile, pThis);
616	if (RT_SUCCESS(rc))
617	{
618	int rc2 = drvNATConstructRedir(pDrvIns->iInstance, pThis, pCfgHandle, Network);
619	if (RT_SUCCESS(rc2))
620	{
621	/*
622	* Register a load done notification to get the MAC address into the slirp
623	* engine after we loaded a guest state.
624	*/
625	rc2 = PDMDrvHlpSSMRegister(pDrvIns, pDrvIns->pDrvReg->szDriverName,
626	pDrvIns->iInstance, 0, 0,
627	NULL, NULL, NULL, NULL, NULL, drvNATLoadDone);
628	AssertRC(rc2);
629	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
630	pDrvIns->pDrvHlp->pfnPDMPollerRegister(pDrvIns, drvNATPoller);
631	#else
632	rc = RTSemEventCreate(&pThis->semSndMutex);
633	AssertReleaseRC(rc);
634
635	/*
636	* Create the control pipe.
637	* XXX: Linux only
638	*/
639	int fds[2];
640	if (pipe(&fds[0]) != 0) /** @todo RTPipeCreate() or something... */
641	{
642	int rc = RTErrConvertFromErrno(errno);
643	AssertRC(rc);
644	return rc;
645	}
646	pThis->PipeRead = fds[0];
647	pThis->PipeWrite = fds[1];
648
649	rc = PDMDrvHlpPDMThreadCreate(pDrvIns, &pThis->pThread, pThis, drvNATAsyncIoThread, drvNATAsyncIoWakeup, 128 * _1K, RTTHREADTYPE_IO, "NAT");
650	AssertReleaseRC(rc);
651	#endif
652
653	pThis->enmLinkState = PDMNETWORKLINKSTATE_UP;
654
655	/* might return VINF_NAT_DNS */
656	return rc;
657	}
658	/* failure path */
659	rc = rc2;
660	slirp_term(pThis->pNATState);
661	pThis->pNATState = NULL;
662	}
663	else
664	{
665	PDMDRV_SET_ERROR(pDrvIns, rc, N_("Unknown error during NAT networking setup: "));
666	AssertMsgFailed(("Add error message for rc=%d (%Rrc)\n", rc, rc));
667	}
668
669	#ifndef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
670	RTCritSectDelete(&pThis->CritSect);
671	#endif
672	return rc;
673	}
674
675
676	/**
677	* NAT network transport driver registration record.
678	*/
679	const PDMDRVREG g_DrvNAT =
680	{
681	/* u32Version */
682	PDM_DRVREG_VERSION,
683	/* szDriverName */
684	"NAT",
685	/* pszDescription */
686	"NAT Network Transport Driver",
687	/* fFlags */
688	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
689	/* fClass. */
690	PDM_DRVREG_CLASS_NETWORK,
691	/* cMaxInstances */
692	16,
693	/* cbInstance */
694	sizeof(DRVNAT),
695	/* pfnConstruct */
696	drvNATConstruct,
697	/* pfnDestruct */
698	drvNATDestruct,
699	/* pfnIOCtl */
700	NULL,
701	/* pfnPowerOn */
702	drvNATPowerOn,
703	/* pfnReset */
704	NULL,
705	/* pfnSuspend */
706	NULL,
707	/* pfnResume */
708	NULL,
709	/* pfnDetach */
710	NULL,
711	/* pfnPowerOff */
712	NULL
713	};

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source: vbox/trunk/src/VBox/Devices/Network/DrvNAT.cpp@ 13986

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