DrvNAT.cpp@ 65710

Last change on this file since 65710 was 65710, checked in by vboxsync, 8 years ago
Devices/NAT: fixed small memory leaks on termination
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File size: 65.8 KB

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1	/* $Id: DrvNAT.cpp 65710 2017-02-09 16:55:50Z vboxsync $ */
2	/** @file
3	* DrvNAT - NAT network transport driver.
4	*/
5
6	/*
7	* Copyright (C) 2006-2016 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_DRV_NAT
23	#define __STDC_LIMIT_MACROS
24	#define __STDC_CONSTANT_MACROS
25	#include "slirp/libslirp.h"
26	extern "C" {
27	#include "slirp/slirp_dns.h"
28	}
29	#include "slirp/ctl.h"
30
31	#include <VBox/vmm/dbgf.h>
32	#include <VBox/vmm/pdmdrv.h>
33	#include <VBox/vmm/pdmnetifs.h>
34	#include <VBox/vmm/pdmnetinline.h>
35
36	#include <iprt/assert.h>
37	#include <iprt/critsect.h>
38	#include <iprt/cidr.h>
39	#include <iprt/file.h>
40	#include <iprt/mem.h>
41	#include <iprt/pipe.h>
42	#include <iprt/string.h>
43	#include <iprt/stream.h>
44	#include <iprt/uuid.h>
45
46	#include "VBoxDD.h"
47
48	#ifndef RT_OS_WINDOWS
49	# include <unistd.h>
50	# include <fcntl.h>
51	# include <poll.h>
52	# include <errno.h>
53	#endif
54	#ifdef RT_OS_FREEBSD
55	# include <netinet/in.h>
56	#endif
57	#include <iprt/semaphore.h>
58	#include <iprt/req.h>
59	#ifdef RT_OS_DARWIN
60	# include <SystemConfiguration/SystemConfiguration.h>
61	# include <CoreFoundation/CoreFoundation.h>
62	#endif
63
64	#define COUNTERS_INIT
65	#include "counters.h"
66
67
68	/*********************************************************************************************************************************
69	* Defined Constants And Macros *
70	*********************************************************************************************************************************/
71
72	#define DRVNAT_MAXFRAMESIZE (16 * 1024)
73
74	/**
75	* @todo: This is a bad hack to prevent freezing the guest during high network
76	* activity. Windows host only. This needs to be fixed properly.
77	*/
78	#define VBOX_NAT_DELAY_HACK
79
80	#define GET_EXTRADATA(pthis, node, name, rc, type, type_name, var) \
81	do { \
82	(rc) = CFGMR3Query ## type((node), name, &(var)); \
83	if (RT_FAILURE((rc)) && (rc) != VERR_CFGM_VALUE_NOT_FOUND) \
84	return PDMDrvHlpVMSetError((pthis)->pDrvIns, (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \"" name "\" " #type_name " failed"), \
85	(pthis)->pDrvIns->iInstance); \
86	} while (0)
87
88	#define GET_ED_STRICT(pthis, node, name, rc, type, type_name, var) \
89	do { \
90	(rc) = CFGMR3Query ## type((node), name, &(var)); \
91	if (RT_FAILURE((rc))) \
92	return PDMDrvHlpVMSetError((pthis)->pDrvIns, (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \"" name "\" " #type_name " failed"), \
93	(pthis)->pDrvIns->iInstance); \
94	} while (0)
95
96	#define GET_EXTRADATA_N(pthis, node, name, rc, type, type_name, var, var_size) \
97	do { \
98	(rc) = CFGMR3Query ## type((node), name, &(var), var_size); \
99	if (RT_FAILURE((rc)) && (rc) != VERR_CFGM_VALUE_NOT_FOUND) \
100	return PDMDrvHlpVMSetError((pthis)->pDrvIns, (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \"" name "\" " #type_name " failed"), \
101	(pthis)->pDrvIns->iInstance); \
102	} while (0)
103
104	#define GET_BOOL(rc, pthis, node, name, var) \
105	GET_EXTRADATA(pthis, node, name, (rc), Bool, bolean, (var))
106	#define GET_STRING(rc, pthis, node, name, var, var_size) \
107	GET_EXTRADATA_N(pthis, node, name, (rc), String, string, (var), (var_size))
108	#define GET_STRING_ALLOC(rc, pthis, node, name, var) \
109	GET_EXTRADATA(pthis, node, name, (rc), StringAlloc, string, (var))
110	#define GET_S32(rc, pthis, node, name, var) \
111	GET_EXTRADATA(pthis, node, name, (rc), S32, int, (var))
112	#define GET_S32_STRICT(rc, pthis, node, name, var) \
113	GET_ED_STRICT(pthis, node, name, (rc), S32, int, (var))
114
115
116
117	#define DO_GET_IP(rc, node, instance, status, x) \
118	do { \
119	char sz##x[32]; \
120	GET_STRING((rc), (node), (instance), #x, sz ## x[0], sizeof(sz ## x)); \
121	if (rc != VERR_CFGM_VALUE_NOT_FOUND) \
122	(status) = inet_aton(sz ## x, &x); \
123	} while (0)
124
125	#define GETIP_DEF(rc, node, instance, x, def) \
126	do \
127	{ \
128	int status = 0; \
129	DO_GET_IP((rc), (node), (instance), status, x); \
130	if (status == 0 \|\| rc == VERR_CFGM_VALUE_NOT_FOUND) \
131	x.s_addr = def; \
132	} while (0)
133
134
135	/*********************************************************************************************************************************
136	* Structures and Typedefs *
137	*********************************************************************************************************************************/
138	/**
139	* NAT network transport driver instance data.
140	*
141	* @implements PDMINETWORKUP
142	*/
143	typedef struct DRVNAT
144	{
145	/** The network interface. */
146	PDMINETWORKUP INetworkUp;
147	/** The network NAT Engine configureation. */
148	PDMINETWORKNATCONFIG INetworkNATCfg;
149	/** The port we're attached to. */
150	PPDMINETWORKDOWN pIAboveNet;
151	/** The network config of the port we're attached to. */
152	PPDMINETWORKCONFIG pIAboveConfig;
153	/** Pointer to the driver instance. */
154	PPDMDRVINS pDrvIns;
155	/** Link state */
156	PDMNETWORKLINKSTATE enmLinkState;
157	/** NAT state for this instance. */
158	PNATState pNATState;
159	/** TFTP directory prefix. */
160	char *pszTFTPPrefix;
161	/** Boot file name to provide in the DHCP server response. */
162	char *pszBootFile;
163	/** tftp server name to provide in the DHCP server response. */
164	char *pszNextServer;
165	/** Polling thread. */
166	PPDMTHREAD pSlirpThread;
167	/** Queue for NAT-thread-external events. */
168	RTREQQUEUE hSlirpReqQueue;
169	/** The guest IP for port-forwarding. */
170	uint32_t GuestIP;
171	/** Link state set when the VM is suspended. */
172	PDMNETWORKLINKSTATE enmLinkStateWant;
173
174	#ifndef RT_OS_WINDOWS
175	/** The write end of the control pipe. */
176	RTPIPE hPipeWrite;
177	/** The read end of the control pipe. */
178	RTPIPE hPipeRead;
179	# if HC_ARCH_BITS == 32
180	uint32_t u32Padding;
181	# endif
182	#else
183	/** for external notification */
184	HANDLE hWakeupEvent;
185	#endif
186
187	#define DRV_PROFILE_COUNTER(name, dsc) STAMPROFILE Stat ## name
188	#define DRV_COUNTING_COUNTER(name, dsc) STAMCOUNTER Stat ## name
189	#include "counters.h"
190	/** thread delivering packets for receiving by the guest */
191	PPDMTHREAD pRecvThread;
192	/** thread delivering urg packets for receiving by the guest */
193	PPDMTHREAD pUrgRecvThread;
194	/** event to wakeup the guest receive thread */
195	RTSEMEVENT EventRecv;
196	/** event to wakeup the guest urgent receive thread */
197	RTSEMEVENT EventUrgRecv;
198	/** Receive Req queue (deliver packets to the guest) */
199	RTREQQUEUE hRecvReqQueue;
200	/** Receive Urgent Req queue (deliver packets to the guest). */
201	RTREQQUEUE hUrgRecvReqQueue;
202
203	/** makes access to device func RecvAvail and Recv atomical. */
204	RTCRITSECT DevAccessLock;
205	/** Number of in-flight urgent packets. */
206	volatile uint32_t cUrgPkts;
207	/** Number of in-flight regular packets. */
208	volatile uint32_t cPkts;
209
210	/** Transmit lock taken by BeginXmit and released by EndXmit. */
211	RTCRITSECT XmitLock;
212
213	/** Request queue for the async host resolver. */
214	RTREQQUEUE hHostResQueue;
215	/** Async host resolver thread. */
216	PPDMTHREAD pHostResThread;
217
218	#ifdef RT_OS_DARWIN
219	/* Handle of the DNS watcher runloop source. */
220	CFRunLoopSourceRef hRunLoopSrcDnsWatcher;
221	#endif
222	} DRVNAT;
223	AssertCompileMemberAlignment(DRVNAT, StatNATRecvWakeups, 8);
224	/** Pointer to the NAT driver instance data. */
225	typedef DRVNAT *PDRVNAT;
226
227
228	/*********************************************************************************************************************************
229	* Internal Functions *
230	*********************************************************************************************************************************/
231	static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho);
232	DECLINLINE(void) drvNATUpdateDNS(PDRVNAT pThis, bool fFlapLink);
233	static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis);
234
235
236	/**
237	* @callback_method_impl{FNPDMTHREADDRV}
238	*/
239	static DECLCALLBACK(int) drvNATRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
240	{
241	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
242
243	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
244	return VINF_SUCCESS;
245
246	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
247	{
248	RTReqQueueProcess(pThis->hRecvReqQueue, 0);
249	if (ASMAtomicReadU32(&pThis->cPkts) == 0)
250	RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
251	}
252	return VINF_SUCCESS;
253	}
254
255
256	/**
257	* @callback_method_impl{FNPDMTHREADWAKEUPDRV}
258	*/
259	static DECLCALLBACK(int) drvNATRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
260	{
261	RT_NOREF(pThread);
262	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
263	int rc;
264	rc = RTSemEventSignal(pThis->EventRecv);
265
266	STAM_COUNTER_INC(&pThis->StatNATRecvWakeups);
267	return VINF_SUCCESS;
268	}
269
270
271	/**
272	* @callback_method_impl{FNPDMTHREADDRV}
273	*/
274	static DECLCALLBACK(int) drvNATUrgRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
275	{
276	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
277
278	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
279	return VINF_SUCCESS;
280
281	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
282	{
283	RTReqQueueProcess(pThis->hUrgRecvReqQueue, 0);
284	if (ASMAtomicReadU32(&pThis->cUrgPkts) == 0)
285	{
286	int rc = RTSemEventWait(pThis->EventUrgRecv, RT_INDEFINITE_WAIT);
287	AssertRC(rc);
288	}
289	}
290	return VINF_SUCCESS;
291	}
292
293
294	/**
295	* @callback_method_impl{FNPDMTHREADWAKEUPDRV}
296	*/
297	static DECLCALLBACK(int) drvNATUrgRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
298	{
299	RT_NOREF(pThread);
300	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
301	int rc = RTSemEventSignal(pThis->EventUrgRecv);
302	AssertRC(rc);
303
304	return VINF_SUCCESS;
305	}
306
307
308	static DECLCALLBACK(void) drvNATUrgRecvWorker(PDRVNAT pThis, uint8_t pu8Buf, int cb, struct mbuf m)
309	{
310	int rc = RTCritSectEnter(&pThis->DevAccessLock);
311	AssertRC(rc);
312	rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
313	if (RT_SUCCESS(rc))
314	{
315	rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
316	AssertRC(rc);
317	}
318	else if ( rc != VERR_TIMEOUT
319	&& rc != VERR_INTERRUPTED)
320	{
321	AssertRC(rc);
322	}
323
324	rc = RTCritSectLeave(&pThis->DevAccessLock);
325	AssertRC(rc);
326
327	slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
328	if (ASMAtomicDecU32(&pThis->cUrgPkts) == 0)
329	{
330	drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
331	drvNATNotifyNATThread(pThis, "drvNATUrgRecvWorker");
332	}
333	}
334
335
336	static DECLCALLBACK(void) drvNATRecvWorker(PDRVNAT pThis, uint8_t pu8Buf, int cb, struct mbuf m)
337	{
338	int rc;
339	STAM_PROFILE_START(&pThis->StatNATRecv, a);
340
341
342	while (ASMAtomicReadU32(&pThis->cUrgPkts) != 0)
343	{
344	rc = RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
345	if ( RT_FAILURE(rc)
346	&& ( rc == VERR_TIMEOUT
347	\|\| rc == VERR_INTERRUPTED))
348	goto done_unlocked;
349	}
350
351	rc = RTCritSectEnter(&pThis->DevAccessLock);
352	AssertRC(rc);
353
354	STAM_PROFILE_START(&pThis->StatNATRecvWait, b);
355	rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
356	STAM_PROFILE_STOP(&pThis->StatNATRecvWait, b);
357
358	if (RT_SUCCESS(rc))
359	{
360	rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
361	AssertRC(rc);
362	}
363	else if ( rc != VERR_TIMEOUT
364	&& rc != VERR_INTERRUPTED)
365	{
366	AssertRC(rc);
367	}
368
369	rc = RTCritSectLeave(&pThis->DevAccessLock);
370	AssertRC(rc);
371
372	done_unlocked:
373	slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
374	ASMAtomicDecU32(&pThis->cPkts);
375
376	drvNATNotifyNATThread(pThis, "drvNATRecvWorker");
377
378	STAM_PROFILE_STOP(&pThis->StatNATRecv, a);
379	}
380
381	/**
382	* Frees a S/G buffer allocated by drvNATNetworkUp_AllocBuf.
383	*
384	* @param pThis Pointer to the NAT instance.
385	* @param pSgBuf The S/G buffer to free.
386	*/
387	static void drvNATFreeSgBuf(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
388	{
389	Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_MAGIC_MASK) == PDMSCATTERGATHER_FLAGS_MAGIC);
390	pSgBuf->fFlags = 0;
391	if (pSgBuf->pvAllocator)
392	{
393	Assert(!pSgBuf->pvUser);
394	slirp_ext_m_free(pThis->pNATState, (struct mbuf *)pSgBuf->pvAllocator, NULL);
395	pSgBuf->pvAllocator = NULL;
396	}
397	else if (pSgBuf->pvUser)
398	{
399	RTMemFree(pSgBuf->aSegs[0].pvSeg);
400	pSgBuf->aSegs[0].pvSeg = NULL;
401	RTMemFree(pSgBuf->pvUser);
402	pSgBuf->pvUser = NULL;
403	}
404	RTMemFree(pSgBuf);
405	}
406
407	/**
408	* Worker function for drvNATSend().
409	*
410	* @param pThis Pointer to the NAT instance.
411	* @param pSgBuf The scatter/gather buffer.
412	* @thread NAT
413	*/
414	static void drvNATSendWorker(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
415	{
416	#if 0 /* Assertion happens often to me after resuming a VM -- no time to investigate this now. */
417	Assert(pThis->enmLinkState == PDMNETWORKLINKSTATE_UP);
418	#endif
419	if (pThis->enmLinkState == PDMNETWORKLINKSTATE_UP)
420	{
421	struct mbuf m = (struct mbuf )pSgBuf->pvAllocator;
422	if (m)
423	{
424	/*
425	* A normal frame.
426	*/
427	pSgBuf->pvAllocator = NULL;
428	slirp_input(pThis->pNATState, m, pSgBuf->cbUsed);
429	}
430	else
431	{
432	/*
433	* GSO frame, need to segment it.
434	*/
435	/** @todo Make the NAT engine grok large frames? Could be more efficient... */
436	#if 0 /* this is for testing PDMNetGsoCarveSegmentQD. */
437	uint8_t abHdrScratch[256];
438	#endif
439	uint8_t const pbFrame = (uint8_t const )pSgBuf->aSegs[0].pvSeg;
440	PCPDMNETWORKGSO pGso = (PCPDMNETWORKGSO)pSgBuf->pvUser;
441	uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, pSgBuf->cbUsed); Assert(cSegs > 1);
442	for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
443	{
444	size_t cbSeg;
445	void *pvSeg;
446	m = slirp_ext_m_get(pThis->pNATState, pGso->cbHdrsTotal + pGso->cbMaxSeg, &pvSeg, &cbSeg);
447	if (!m)
448	break;
449
450	#if 1
451	uint32_t cbPayload, cbHdrs;
452	uint32_t offPayload = PDMNetGsoCarveSegment(pGso, pbFrame, pSgBuf->cbUsed,
453	iSeg, cSegs, (uint8_t *)pvSeg, &cbHdrs, &cbPayload);
454	memcpy((uint8_t *)pvSeg + cbHdrs, pbFrame + offPayload, cbPayload);
455
456	slirp_input(pThis->pNATState, m, cbPayload + cbHdrs);
457	#else
458	uint32_t cbSegFrame;
459	void pvSegFrame = PDMNetGsoCarveSegmentQD(pGso, (uint8_t )pbFrame, pSgBuf->cbUsed, abHdrScratch,
460	iSeg, cSegs, &cbSegFrame);
461	memcpy((uint8_t *)pvSeg, pvSegFrame, cbSegFrame);
462
463	slirp_input(pThis->pNATState, m, cbSegFrame);
464	#endif
465	}
466	}
467	}
468	drvNATFreeSgBuf(pThis, pSgBuf);
469
470	/** @todo Implement the VERR_TRY_AGAIN drvNATNetworkUp_AllocBuf semantics. */
471	}
472
473	/**
474	* @interface_method_impl{PDMINETWORKUP,pfnBeginXmit}
475	*/
476	static DECLCALLBACK(int) drvNATNetworkUp_BeginXmit(PPDMINETWORKUP pInterface, bool fOnWorkerThread)
477	{
478	RT_NOREF(fOnWorkerThread);
479	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
480	int rc = RTCritSectTryEnter(&pThis->XmitLock);
481	if (RT_FAILURE(rc))
482	{
483	/** @todo Kick the worker thread when we have one... */
484	rc = VERR_TRY_AGAIN;
485	}
486	return rc;
487	}
488
489	/**
490	* @interface_method_impl{PDMINETWORKUP,pfnAllocBuf}
491	*/
492	static DECLCALLBACK(int) drvNATNetworkUp_AllocBuf(PPDMINETWORKUP pInterface, size_t cbMin,
493	PCPDMNETWORKGSO pGso, PPPDMSCATTERGATHER ppSgBuf)
494	{
495	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
496	Assert(RTCritSectIsOwner(&pThis->XmitLock));
497
498	/*
499	* Drop the incoming frame if the NAT thread isn't running.
500	*/
501	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
502	{
503	Log(("drvNATNetowrkUp_AllocBuf: returns VERR_NET_NO_NETWORK\n"));
504	return VERR_NET_NO_NETWORK;
505	}
506
507	/*
508	* Allocate a scatter/gather buffer and an mbuf.
509	*/
510	PPDMSCATTERGATHER pSgBuf = (PPDMSCATTERGATHER)RTMemAlloc(sizeof(*pSgBuf));
511	if (!pSgBuf)
512	return VERR_NO_MEMORY;
513	if (!pGso)
514	{
515	/*
516	* Drop the frame if it is too big.
517	*/
518	if (cbMin >= DRVNAT_MAXFRAMESIZE)
519	{
520	Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
521	cbMin));
522	RTMemFree(pSgBuf);
523	return VERR_INVALID_PARAMETER;
524	}
525
526	pSgBuf->pvUser = NULL;
527	pSgBuf->pvAllocator = slirp_ext_m_get(pThis->pNATState, cbMin,
528	&pSgBuf->aSegs[0].pvSeg, &pSgBuf->aSegs[0].cbSeg);
529	if (!pSgBuf->pvAllocator)
530	{
531	RTMemFree(pSgBuf);
532	return VERR_TRY_AGAIN;
533	}
534	}
535	else
536	{
537	/*
538	* Drop the frame if its segment is too big.
539	*/
540	if (pGso->cbHdrsTotal + pGso->cbMaxSeg >= DRVNAT_MAXFRAMESIZE)
541	{
542	Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
543	pGso->cbHdrsTotal + pGso->cbMaxSeg));
544	RTMemFree(pSgBuf);
545	return VERR_INVALID_PARAMETER;
546	}
547
548	pSgBuf->pvUser = RTMemDup(pGso, sizeof(*pGso));
549	pSgBuf->pvAllocator = NULL;
550	pSgBuf->aSegs[0].cbSeg = RT_ALIGN_Z(cbMin, 16);
551	pSgBuf->aSegs[0].pvSeg = RTMemAlloc(pSgBuf->aSegs[0].cbSeg);
552	if (!pSgBuf->pvUser \|\| !pSgBuf->aSegs[0].pvSeg)
553	{
554	RTMemFree(pSgBuf->aSegs[0].pvSeg);
555	RTMemFree(pSgBuf->pvUser);
556	RTMemFree(pSgBuf);
557	return VERR_TRY_AGAIN;
558	}
559	}
560
561	/*
562	* Initialize the S/G buffer and return.
563	*/
564	pSgBuf->fFlags = PDMSCATTERGATHER_FLAGS_MAGIC \| PDMSCATTERGATHER_FLAGS_OWNER_1;
565	pSgBuf->cbUsed = 0;
566	pSgBuf->cbAvailable = pSgBuf->aSegs[0].cbSeg;
567	pSgBuf->cSegs = 1;
568
569	#if 0 /* poison */
570	memset(pSgBuf->aSegs[0].pvSeg, 'F', pSgBuf->aSegs[0].cbSeg);
571	#endif
572	*ppSgBuf = pSgBuf;
573	return VINF_SUCCESS;
574	}
575
576	/**
577	* @interface_method_impl{PDMINETWORKUP,pfnFreeBuf}
578	*/
579	static DECLCALLBACK(int) drvNATNetworkUp_FreeBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf)
580	{
581	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
582	Assert(RTCritSectIsOwner(&pThis->XmitLock));
583	drvNATFreeSgBuf(pThis, pSgBuf);
584	return VINF_SUCCESS;
585	}
586
587	/**
588	* @interface_method_impl{PDMINETWORKUP,pfnSendBuf}
589	*/
590	static DECLCALLBACK(int) drvNATNetworkUp_SendBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf, bool fOnWorkerThread)
591	{
592	RT_NOREF(fOnWorkerThread);
593	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
594	Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_OWNER_MASK) == PDMSCATTERGATHER_FLAGS_OWNER_1);
595	Assert(RTCritSectIsOwner(&pThis->XmitLock));
596
597	int rc;
598	if (pThis->pSlirpThread->enmState == PDMTHREADSTATE_RUNNING)
599	{
600	/* Set an FTM checkpoint as this operation changes the state permanently. */
601	PDMDrvHlpFTSetCheckpoint(pThis->pDrvIns, FTMCHECKPOINTTYPE_NETWORK);
602
603	rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, NULL /ppReq/, 0 /cMillies/,
604	RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
605	(PFNRT)drvNATSendWorker, 2, pThis, pSgBuf);
606	if (RT_SUCCESS(rc))
607	{
608	drvNATNotifyNATThread(pThis, "drvNATNetworkUp_SendBuf");
609	return VINF_SUCCESS;
610	}
611
612	rc = VERR_NET_NO_BUFFER_SPACE;
613	}
614	else
615	rc = VERR_NET_DOWN;
616	drvNATFreeSgBuf(pThis, pSgBuf);
617	return rc;
618	}
619
620	/**
621	* @interface_method_impl{PDMINETWORKUP,pfnEndXmit}
622	*/
623	static DECLCALLBACK(void) drvNATNetworkUp_EndXmit(PPDMINETWORKUP pInterface)
624	{
625	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
626	RTCritSectLeave(&pThis->XmitLock);
627	}
628
629	/**
630	* Get the NAT thread out of poll/WSAWaitForMultipleEvents
631	*/
632	static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho)
633	{
634	RT_NOREF(pszWho);
635	int rc;
636	#ifndef RT_OS_WINDOWS
637	/* kick poll() */
638	size_t cbIgnored;
639	rc = RTPipeWrite(pThis->hPipeWrite, "", 1, &cbIgnored);
640	#else
641	/* kick WSAWaitForMultipleEvents */
642	rc = WSASetEvent(pThis->hWakeupEvent);
643	#endif
644	AssertRC(rc);
645	}
646
647	/**
648	* @interface_method_impl{PDMINETWORKUP,pfnSetPromiscuousMode}
649	*/
650	static DECLCALLBACK(void) drvNATNetworkUp_SetPromiscuousMode(PPDMINETWORKUP pInterface, bool fPromiscuous)
651	{
652	RT_NOREF(pInterface, fPromiscuous);
653	LogFlow(("drvNATNetworkUp_SetPromiscuousMode: fPromiscuous=%d\n", fPromiscuous));
654	/* nothing to do */
655	}
656
657	/**
658	* Worker function for drvNATNetworkUp_NotifyLinkChanged().
659	* @thread "NAT" thread.
660	*/
661	static void drvNATNotifyLinkChangedWorker(PDRVNAT pThis, PDMNETWORKLINKSTATE enmLinkState)
662	{
663	pThis->enmLinkState = pThis->enmLinkStateWant = enmLinkState;
664	switch (enmLinkState)
665	{
666	case PDMNETWORKLINKSTATE_UP:
667	LogRel(("NAT: Link up\n"));
668	slirp_link_up(pThis->pNATState);
669	break;
670
671	case PDMNETWORKLINKSTATE_DOWN:
672	case PDMNETWORKLINKSTATE_DOWN_RESUME:
673	LogRel(("NAT: Link down\n"));
674	slirp_link_down(pThis->pNATState);
675	break;
676
677	default:
678	AssertMsgFailed(("drvNATNetworkUp_NotifyLinkChanged: unexpected link state %d\n", enmLinkState));
679	}
680	}
681
682	/**
683	* Notification on link status changes.
684	*
685	* @param pInterface Pointer to the interface structure containing the called function pointer.
686	* @param enmLinkState The new link state.
687	* @thread EMT
688	*/
689	static DECLCALLBACK(void) drvNATNetworkUp_NotifyLinkChanged(PPDMINETWORKUP pInterface, PDMNETWORKLINKSTATE enmLinkState)
690	{
691	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
692
693	LogFlow(("drvNATNetworkUp_NotifyLinkChanged: enmLinkState=%d\n", enmLinkState));
694
695	/* Don't queue new requests if the NAT thread is not running (e.g. paused,
696	* stopping), otherwise we would deadlock. Memorize the change. */
697	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
698	{
699	pThis->enmLinkStateWant = enmLinkState;
700	return;
701	}
702
703	PRTREQ pReq;
704	int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /cMillies/, RTREQFLAGS_VOID,
705	(PFNRT)drvNATNotifyLinkChangedWorker, 2, pThis, enmLinkState);
706	if (rc == VERR_TIMEOUT)
707	{
708	drvNATNotifyNATThread(pThis, "drvNATNetworkUp_NotifyLinkChanged");
709	rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
710	AssertRC(rc);
711	}
712	else
713	AssertRC(rc);
714	RTReqRelease(pReq);
715	}
716
717	static void drvNATNotifyApplyPortForwardCommand(PDRVNAT pThis, bool fRemove,
718	bool fUdp, const char *pHostIp,
719	uint16_t u16HostPort, const char *pGuestIp, uint16_t u16GuestPort)
720	{
721	struct in_addr guestIp, hostIp;
722
723	if ( pHostIp == NULL
724	\|\| inet_aton(pHostIp, &hostIp) == 0)
725	hostIp.s_addr = INADDR_ANY;
726
727	if ( pGuestIp == NULL
728	\|\| inet_aton(pGuestIp, &guestIp) == 0)
729	guestIp.s_addr = pThis->GuestIP;
730
731	if (fRemove)
732	slirp_remove_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
733	else
734	slirp_add_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
735	}
736
737	static DECLCALLBACK(int) drvNATNetworkNatConfigRedirect(PPDMINETWORKNATCONFIG pInterface, bool fRemove,
738	bool fUdp, const char *pHostIp, uint16_t u16HostPort,
739	const char *pGuestIp, uint16_t u16GuestPort)
740	{
741	LogFlowFunc(("fRemove=%d, fUdp=%d, pHostIp=%s, u16HostPort=%u, pGuestIp=%s, u16GuestPort=%u\n",
742	RT_BOOL(fRemove), RT_BOOL(fUdp), pHostIp, u16HostPort, pGuestIp, u16GuestPort));
743	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
744	/* Execute the command directly if the VM is not running. */
745	int rc;
746	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
747	{
748	drvNATNotifyApplyPortForwardCommand(pThis, fRemove, fUdp, pHostIp,
749	u16HostPort, pGuestIp,u16GuestPort);
750	rc = VINF_SUCCESS;
751	}
752	else
753	{
754	PRTREQ pReq;
755	rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /cMillies/, RTREQFLAGS_VOID,
756	(PFNRT)drvNATNotifyApplyPortForwardCommand, 7, pThis, fRemove,
757	fUdp, pHostIp, u16HostPort, pGuestIp, u16GuestPort);
758	if (rc == VERR_TIMEOUT)
759	{
760	drvNATNotifyNATThread(pThis, "drvNATNetworkNatConfigRedirect");
761	rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
762	AssertRC(rc);
763	}
764	else
765	AssertRC(rc);
766
767	RTReqRelease(pReq);
768	}
769	return rc;
770	}
771
772	/**
773	* NAT thread handling the slirp stuff.
774	*
775	* The slirp implementation is single-threaded so we execute this enginre in a
776	* dedicated thread. We take care that this thread does not become the
777	* bottleneck: If the guest wants to send, a request is enqueued into the
778	* hSlirpReqQueue and handled asynchronously by this thread. If this thread
779	* wants to deliver packets to the guest, it enqueues a request into
780	* hRecvReqQueue which is later handled by the Recv thread.
781	*/
782	static DECLCALLBACK(int) drvNATAsyncIoThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
783	{
784	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
785	int nFDs = -1;
786	#ifdef RT_OS_WINDOWS
787	HANDLE *phEvents = slirp_get_events(pThis->pNATState);
788	unsigned int cBreak = 0;
789	#else /* RT_OS_WINDOWS */
790	unsigned int cPollNegRet = 0;
791	#endif /* !RT_OS_WINDOWS */
792
793	LogFlow(("drvNATAsyncIoThread: pThis=%p\n", pThis));
794
795	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
796	return VINF_SUCCESS;
797
798	if (pThis->enmLinkStateWant != pThis->enmLinkState)
799	drvNATNotifyLinkChangedWorker(pThis, pThis->enmLinkStateWant);
800
801	/*
802	* Polling loop.
803	*/
804	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
805	{
806	/*
807	* To prevent concurrent execution of sending/receiving threads
808	*/
809	#ifndef RT_OS_WINDOWS
810	nFDs = slirp_get_nsock(pThis->pNATState);
811	/* allocation for all sockets + Management pipe */
812	struct pollfd polls = (struct pollfd )RTMemAlloc((1 + nFDs) * sizeof(struct pollfd) + sizeof(uint32_t));
813	if (polls == NULL)
814	return VERR_NO_MEMORY;
815
816	/* don't pass the management pipe */
817	slirp_select_fill(pThis->pNATState, &nFDs, &polls[1]);
818
819	polls[0].fd = RTPipeToNative(pThis->hPipeRead);
820	/* POLLRDBAND usually doesn't used on Linux but seems used on Solaris */
821	polls[0].events = POLLRDNORM \| POLLPRI \| POLLRDBAND;
822	polls[0].revents = 0;
823
824	int cChangedFDs = poll(polls, nFDs + 1, slirp_get_timeout_ms(pThis->pNATState));
825	if (cChangedFDs < 0)
826	{
827	if (errno == EINTR)
828	{
829	Log2(("NAT: signal was caught while sleep on poll\n"));
830	/* No error, just process all outstanding requests but don't wait */
831	cChangedFDs = 0;
832	}
833	else if (cPollNegRet++ > 128)
834	{
835	LogRel(("NAT: Poll returns (%s) suppressed %d\n", strerror(errno), cPollNegRet));
836	cPollNegRet = 0;
837	}
838	}
839
840	if (cChangedFDs >= 0)
841	{
842	slirp_select_poll(pThis->pNATState, &polls[1], nFDs);
843	if (polls[0].revents & (POLLRDNORM\|POLLPRI\|POLLRDBAND))
844	{
845	/* drain the pipe
846	*
847	* Note! drvNATSend decoupled so we don't know how many times
848	* device's thread sends before we've entered multiplex,
849	* so to avoid false alarm drain pipe here to the very end
850	*
851	* @todo: Probably we should counter drvNATSend to count how
852	* deep pipe has been filed before drain.
853	*
854	*/
855	/** @todo XXX: Make it reading exactly we need to drain the
856	* pipe.*/
857	char ch;
858	size_t cbRead;
859	RTPipeRead(pThis->hPipeRead, &ch, 1, &cbRead);
860	}
861	}
862	/* process _all_ outstanding requests but don't wait */
863	RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
864	RTMemFree(polls);
865
866	#else /* RT_OS_WINDOWS */
867	nFDs = -1;
868	slirp_select_fill(pThis->pNATState, &nFDs);
869	DWORD dwEvent = WSAWaitForMultipleEvents(nFDs, phEvents, FALSE,
870	slirp_get_timeout_ms(pThis->pNATState),
871	/* :fAlertable */ TRUE);
872	AssertCompile(WSA_WAIT_EVENT_0 == 0);
873	if ( (/dwEvent < WSA_WAIT_EVENT_0 \|\|/ dwEvent > WSA_WAIT_EVENT_0 + nFDs - 1)
874	&& dwEvent != WSA_WAIT_TIMEOUT && dwEvent != WSA_WAIT_IO_COMPLETION)
875	{
876	int error = WSAGetLastError();
877	LogRel(("NAT: WSAWaitForMultipleEvents returned %d (error %d)\n", dwEvent, error));
878	RTAssertPanic();
879	}
880
881	if (dwEvent == WSA_WAIT_TIMEOUT)
882	{
883	/* only check for slow/fast timers */
884	slirp_select_poll(pThis->pNATState, /* fTimeout=*/true);
885	continue;
886	}
887	/* poll the sockets in any case */
888	Log2(("%s: poll\n", __FUNCTION__));
889	slirp_select_poll(pThis->pNATState, /* fTimeout=*/false);
890	/* process _all_ outstanding requests but don't wait */
891	RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
892	# ifdef VBOX_NAT_DELAY_HACK
893	if (cBreak++ > 128)
894	{
895	cBreak = 0;
896	RTThreadSleep(2);
897	}
898	# endif
899	#endif /* RT_OS_WINDOWS */
900	}
901
902	return VINF_SUCCESS;
903	}
904
905
906	/**
907	* Unblock the send thread so it can respond to a state change.
908	*
909	* @returns VBox status code.
910	* @param pDevIns The pcnet device instance.
911	* @param pThread The send thread.
912	*/
913	static DECLCALLBACK(int) drvNATAsyncIoWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
914	{
915	RT_NOREF(pThread);
916	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
917
918	drvNATNotifyNATThread(pThis, "drvNATAsyncIoWakeup");
919	return VINF_SUCCESS;
920	}
921
922
923	static DECLCALLBACK(int) drvNATHostResThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
924	{
925	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
926
927	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
928	return VINF_SUCCESS;
929
930	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
931	{
932	RTReqQueueProcess(pThis->hHostResQueue, RT_INDEFINITE_WAIT);
933	}
934
935	return VINF_SUCCESS;
936	}
937
938
939	static DECLCALLBACK(int) drvNATReqQueueInterrupt()
940	{
941	/*
942	* RTReqQueueProcess loops until request returns a warning or info
943	* status code (other than VINF_SUCCESS).
944	*/
945	return VINF_INTERRUPTED;
946	}
947
948
949	static DECLCALLBACK(int) drvNATHostResWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
950	{
951	RT_NOREF(pThread);
952	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
953	Assert(pThis != NULL);
954
955	int rc;
956	rc = RTReqQueueCallEx(pThis->hHostResQueue, NULL /ppReq/, 0 /cMillies/,
957	RTREQFLAGS_IPRT_STATUS \| RTREQFLAGS_NO_WAIT,
958	(PFNRT)drvNATReqQueueInterrupt, 0);
959	return rc;
960	}
961
962
963	/**
964	* Function called by slirp to check if it's possible to feed incoming data to the network port.
965	* @returns 1 if possible.
966	* @returns 0 if not possible.
967	*/
968	int slirp_can_output(void *pvUser)
969	{
970	RT_NOREF(pvUser);
971	return 1;
972	}
973
974	void slirp_push_recv_thread(void *pvUser)
975	{
976	PDRVNAT pThis = (PDRVNAT)pvUser;
977	Assert(pThis);
978	drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
979	}
980
981	void slirp_urg_output(void pvUser, struct mbuf m, const uint8_t *pu8Buf, int cb)
982	{
983	PDRVNAT pThis = (PDRVNAT)pvUser;
984	Assert(pThis);
985
986	/* don't queue new requests when the NAT thread is about to stop */
987	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
988	return;
989
990	ASMAtomicIncU32(&pThis->cUrgPkts);
991	int rc = RTReqQueueCallEx(pThis->hUrgRecvReqQueue, NULL /ppReq/, 0 /cMillies/, RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
992	(PFNRT)drvNATUrgRecvWorker, 4, pThis, pu8Buf, cb, m);
993	AssertRC(rc);
994	drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
995	}
996
997	/**
998	* Function called by slirp to wake up device after VERR_TRY_AGAIN
999	*/
1000	void slirp_output_pending(void *pvUser)
1001	{
1002	PDRVNAT pThis = (PDRVNAT)pvUser;
1003	Assert(pThis);
1004	LogFlowFuncEnter();
1005	pThis->pIAboveNet->pfnXmitPending(pThis->pIAboveNet);
1006	LogFlowFuncLeave();
1007	}
1008
1009	/**
1010	* Function called by slirp to feed incoming data to the NIC.
1011	*/
1012	void slirp_output(void pvUser, struct mbuf m, const uint8_t *pu8Buf, int cb)
1013	{
1014	PDRVNAT pThis = (PDRVNAT)pvUser;
1015	Assert(pThis);
1016
1017	LogFlow(("slirp_output BEGIN %p %d\n", pu8Buf, cb));
1018	Log6(("slirp_output: pu8Buf=%p cb=%#x (pThis=%p)\n%.*Rhxd\n", pu8Buf, cb, pThis, cb, pu8Buf));
1019
1020	/* don't queue new requests when the NAT thread is about to stop */
1021	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
1022	return;
1023
1024	ASMAtomicIncU32(&pThis->cPkts);
1025	int rc = RTReqQueueCallEx(pThis->hRecvReqQueue, NULL /ppReq/, 0 /cMillies/, RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
1026	(PFNRT)drvNATRecvWorker, 4, pThis, pu8Buf, cb, m);
1027	AssertRC(rc);
1028	drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
1029	STAM_COUNTER_INC(&pThis->StatQueuePktSent);
1030	LogFlowFuncLeave();
1031	}
1032
1033
1034	/*
1035	* Call a function on the slirp thread.
1036	*/
1037	int slirp_call(void pvUser, PRTREQ ppReq, RTMSINTERVAL cMillies,
1038	unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
1039	{
1040	PDRVNAT pThis = (PDRVNAT)pvUser;
1041	Assert(pThis);
1042
1043	int rc;
1044
1045	va_list va;
1046	va_start(va, cArgs);
1047
1048	rc = RTReqQueueCallV(pThis->hSlirpReqQueue, ppReq, cMillies, fFlags, pfnFunction, cArgs, va);
1049
1050	va_end(va);
1051
1052	if (RT_SUCCESS(rc))
1053	drvNATNotifyNATThread(pThis, "slirp_vcall");
1054
1055	return rc;
1056	}
1057
1058
1059	/*
1060	* Call a function on the host resolver thread.
1061	*/
1062	int slirp_call_hostres(void pvUser, PRTREQ ppReq, RTMSINTERVAL cMillies,
1063	unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
1064	{
1065	PDRVNAT pThis = (PDRVNAT)pvUser;
1066	Assert(pThis);
1067
1068	int rc;
1069
1070	AssertReturn((pThis->hHostResQueue != NIL_RTREQQUEUE), VERR_INVALID_STATE);
1071	AssertReturn((pThis->pHostResThread != NULL), VERR_INVALID_STATE);
1072
1073	va_list va;
1074	va_start(va, cArgs);
1075
1076	rc = RTReqQueueCallV(pThis->hHostResQueue, ppReq, cMillies, fFlags,
1077	pfnFunction, cArgs, va);
1078
1079	va_end(va);
1080	return rc;
1081	}
1082
1083
1084	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE && !defined(RT_OS_DARWIN)
1085	/**
1086	* @interface_method_impl{PDMINETWORKNATCONFIG,pfnNotifyDnsChanged}
1087	*
1088	* We are notified that host's resolver configuration has changed. In
1089	* the current setup we don't get any details and just reread that
1090	* information ourselves.
1091	*/
1092	static DECLCALLBACK(void) drvNATNotifyDnsChanged(PPDMINETWORKNATCONFIG pInterface)
1093	{
1094	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
1095	drvNATUpdateDNS(pThis, /* fFlapLink */ true);
1096	}
1097	#endif
1098
1099	#ifdef RT_OS_DARWIN
1100	/**
1101	* Callback for the SystemConfiguration framework to notify us whenever the DNS
1102	* server changes.
1103	*
1104	* @returns nothing.
1105	* @param hDynStor The DynamicStore handle.
1106	* @param hChangedKey Array of changed keys we watch for.
1107	* @param pvUser Opaque user data (NAT driver instance).
1108	*/
1109	static DECLCALLBACK(void) drvNatDnsChanged(SCDynamicStoreRef hDynStor, CFArrayRef hChangedKeys, void *pvUser)
1110	{
1111	PDRVNAT pThis = (PDRVNAT)pvUser;
1112
1113	Log2(("NAT: System configuration has changed\n"));
1114
1115	/* Check if any of parameters we are interested in were actually changed. If the size
1116	* of hChangedKeys is 0, it means that SCDynamicStore has been restarted. */
1117	if (hChangedKeys && CFArrayGetCount(hChangedKeys) > 0)
1118	{
1119	/* Look to the updated parameters in particular. */
1120	CFStringRef pDNSKey = CFSTR("State:/Network/Global/DNS");
1121
1122	if (CFArrayContainsValue(hChangedKeys, CFRangeMake(0, CFArrayGetCount(hChangedKeys)), pDNSKey))
1123	{
1124	LogRel(("NAT: DNS servers changed, triggering reconnect\n"));
1125	#if 0
1126	CFDictionaryRef hDnsDict = (CFDictionaryRef)SCDynamicStoreCopyValue(hDynStor, pDNSKey);
1127	if (hDnsDict)
1128	{
1129	CFArrayRef hArrAddresses = (CFArrayRef)CFDictionaryGetValue(hDnsDict, kSCPropNetDNSServerAddresses);
1130	if (hArrAddresses && CFArrayGetCount(hArrAddresses) > 0)
1131	{
1132	/* Dump DNS servers list. */
1133	for (int i = 0; i < CFArrayGetCount(hArrAddresses); i++)
1134	{
1135	CFStringRef pDNSAddrStr = (CFStringRef)CFArrayGetValueAtIndex(hArrAddresses, i);
1136	const char *pszDNSAddr = pDNSAddrStr ? CFStringGetCStringPtr(pDNSAddrStr, CFStringGetSystemEncoding()) : NULL;
1137	LogRel(("NAT: New DNS server#%d: %s\n", i, pszDNSAddr ? pszDNSAddr : "None"));
1138	}
1139	}
1140	else
1141	LogRel(("NAT: DNS server list is empty (1)\n"));
1142
1143	CFRelease(hDnsDict);
1144	}
1145	else
1146	LogRel(("NAT: DNS server list is empty (2)\n"));
1147	#else
1148	RT_NOREF(hDynStor);
1149	#endif
1150	drvNATUpdateDNS(pThis, /* fFlapLink */ true);
1151	}
1152	else
1153	Log2(("NAT: No DNS changes detected\n"));
1154	}
1155	else
1156	Log2(("NAT: SCDynamicStore has been restarted\n"));
1157	}
1158	#endif
1159
1160	/**
1161	* @interface_method_impl{PDMIBASE,pfnQueryInterface}
1162	*/
1163	static DECLCALLBACK(void ) drvNATQueryInterface(PPDMIBASE pInterface, const char pszIID)
1164	{
1165	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
1166	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1167
1168	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
1169	PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKUP, &pThis->INetworkUp);
1170	PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKNATCONFIG, &pThis->INetworkNATCfg);
1171	return NULL;
1172	}
1173
1174
1175	/**
1176	* Get the MAC address into the slirp stack.
1177	*
1178	* Called by drvNATLoadDone and drvNATPowerOn.
1179	*/
1180	static void drvNATSetMac(PDRVNAT pThis)
1181	{
1182	#if 0 /* XXX: do we still need this for anything? */
1183	if (pThis->pIAboveConfig)
1184	{
1185	RTMAC Mac;
1186	pThis->pIAboveConfig->pfnGetMac(pThis->pIAboveConfig, &Mac);
1187	}
1188	#else
1189	RT_NOREF(pThis);
1190	#endif
1191	}
1192
1193
1194	/**
1195	* After loading we have to pass the MAC address of the ethernet device to the slirp stack.
1196	* Otherwise the guest is not reachable until it performs a DHCP request or an ARP request
1197	* (usually done during guest boot).
1198	*/
1199	static DECLCALLBACK(int) drvNATLoadDone(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM)
1200	{
1201	RT_NOREF(pSSM);
1202	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1203	drvNATSetMac(pThis);
1204	return VINF_SUCCESS;
1205	}
1206
1207
1208	/**
1209	* Some guests might not use DHCP to retrieve an IP but use a static IP.
1210	*/
1211	static DECLCALLBACK(void) drvNATPowerOn(PPDMDRVINS pDrvIns)
1212	{
1213	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1214	drvNATSetMac(pThis);
1215	}
1216
1217
1218	/**
1219	* @interface_method_impl{PDMDEVREG,pfnResume}
1220	*/
1221	static DECLCALLBACK(void) drvNATResume(PPDMDRVINS pDrvIns)
1222	{
1223	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1224	VMRESUMEREASON enmReason = PDMDrvHlpVMGetResumeReason(pDrvIns);
1225
1226	switch (enmReason)
1227	{
1228	case VMRESUMEREASON_HOST_RESUME:
1229	bool fFlapLink;
1230	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE
1231	/* let event handler do it if necessary */
1232	fFlapLink = false;
1233	#else
1234	/* XXX: when in doubt, use brute force */
1235	fFlapLink = true;
1236	#endif
1237	drvNATUpdateDNS(pThis, fFlapLink);
1238	return;
1239	default: /* Ignore every other resume reason. */
1240	/* do nothing */
1241	return;
1242	}
1243	}
1244
1245
1246	static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis)
1247	{
1248	slirpReleaseDnsSettings(pThis->pNATState);
1249	slirpInitializeDnsSettings(pThis->pNATState);
1250	return VINF_SUCCESS;
1251	}
1252
1253	/**
1254	* This function at this stage could be called from two places, but both from non-NAT thread,
1255	* - drvNATResume (EMT?)
1256	* - drvNatDnsChanged (darwin, GUI or main) "listener"
1257	* When Main's interface IHost will support host network configuration change event on every host,
1258	* we won't call it from drvNATResume, but from listener of Main event in the similar way it done
1259	* for port-forwarding, and it wan't be on GUI/main thread, but on EMT thread only.
1260	*
1261	* Thread here is important, because we need to change DNS server list and domain name (+ perhaps,
1262	* search string) at runtime (VBOX_NAT_ENFORCE_INTERNAL_DNS_UPDATE), we can do it safely on NAT thread,
1263	* so with changing other variables (place where we handle update) the main mechanism of update
1264	* _won't_ be changed, the only thing will change is drop of fFlapLink parameter.
1265	*/
1266	DECLINLINE(void) drvNATUpdateDNS(PDRVNAT pThis, bool fFlapLink)
1267	{
1268	int strategy = slirp_host_network_configuration_change_strategy_selector(pThis->pNATState);
1269	switch (strategy)
1270	{
1271	case VBOX_NAT_DNS_DNSPROXY:
1272	{
1273	/**
1274	* XXX: Here or in _strategy_selector we should deal with network change
1275	* in "network change" scenario domain name change we have to update guest lease
1276	* forcibly.
1277	* Note at that built-in dhcp also updates DNS information on NAT thread.
1278	*/
1279	/**
1280	* It's unsafe to to do it directly on non-NAT thread
1281	* so we schedule the worker and kick the NAT thread.
1282	*/
1283	int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, NULL /ppReq/, 0 /cMillies/,
1284	RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
1285	(PFNRT)drvNATReinitializeHostNameResolving, 1, pThis);
1286	if (RT_SUCCESS(rc))
1287	drvNATNotifyNATThread(pThis, "drvNATUpdateDNS");
1288
1289	return;
1290	}
1291
1292	case VBOX_NAT_DNS_EXTERNAL:
1293	/*
1294	* Host resumed from a suspend and the network might have changed.
1295	* Disconnect the guest from the network temporarily to let it pick up the changes.
1296	*/
1297	if (fFlapLink)
1298	pThis->pIAboveConfig->pfnSetLinkState(pThis->pIAboveConfig,
1299	PDMNETWORKLINKSTATE_DOWN_RESUME);
1300	return;
1301
1302	case VBOX_NAT_DNS_HOSTRESOLVER:
1303	default:
1304	return;
1305	}
1306	}
1307
1308
1309	/**
1310	* Info handler.
1311	*/
1312	static DECLCALLBACK(void) drvNATInfo(PPDMDRVINS pDrvIns, PCDBGFINFOHLP pHlp, const char *pszArgs)
1313	{
1314	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1315	slirp_info(pThis->pNATState, pHlp, pszArgs);
1316	}
1317
1318	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1319	static int drvNATConstructDNSMappings(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pMappingsCfg)
1320	{
1321	RT_NOREF(iInstance);
1322	int rc = VINF_SUCCESS;
1323	LogFlowFunc(("ENTER: iInstance:%d\n", iInstance));
1324	for (PCFGMNODE pNode = CFGMR3GetFirstChild(pMappingsCfg); pNode; pNode = CFGMR3GetNextChild(pNode))
1325	{
1326	if (!CFGMR3AreValuesValid(pNode, "HostName\0HostNamePattern\0HostIP\0"))
1327	return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1328	N_("Unknown configuration in dns mapping"));
1329	char szHostNameOrPattern[255];
1330	bool fPattern = false;
1331	RT_ZERO(szHostNameOrPattern);
1332	GET_STRING(rc, pThis, pNode, "HostName", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1333	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1334	{
1335	GET_STRING(rc, pThis, pNode, "HostNamePattern", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1336	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1337	{
1338	char szNodeName[225];
1339	RT_ZERO(szNodeName);
1340	CFGMR3GetName(pNode, szNodeName, sizeof(szNodeName));
1341	LogRel(("NAT: Neither 'HostName' nor 'HostNamePattern' is specified for mapping %s\n", szNodeName));
1342	continue;
1343	}
1344	fPattern = true;
1345	}
1346	struct in_addr HostIP;
1347	RT_ZERO(HostIP);
1348	GETIP_DEF(rc, pThis, pNode, HostIP, INADDR_ANY);
1349	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1350	{
1351	LogRel(("NAT: DNS mapping %s is ignored (address not pointed)\n", szHostNameOrPattern));
1352	continue;
1353	}
1354	slirp_add_host_resolver_mapping(pThis->pNATState, szHostNameOrPattern, fPattern, HostIP.s_addr);
1355	}
1356	LogFlowFunc(("LEAVE: %Rrc\n", rc));
1357	return rc;
1358	}
1359	#endif /* !VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER */
1360
1361
1362	/**
1363	* Sets up the redirectors.
1364	*
1365	* @returns VBox status code.
1366	* @param pCfg The configuration handle.
1367	*/
1368	static int drvNATConstructRedir(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pCfg, PRTNETADDRIPV4 pNetwork)
1369	{
1370	RT_NOREF(pNetwork); /** @todo figure why pNetwork isn't used */
1371
1372	PCFGMNODE pPFTree = CFGMR3GetChild(pCfg, "PortForwarding");
1373	if (pPFTree == NULL)
1374	return VINF_SUCCESS;
1375
1376	/*
1377	* Enumerate redirections.
1378	*/
1379	for (PCFGMNODE pNode = CFGMR3GetFirstChild(pPFTree); pNode; pNode = CFGMR3GetNextChild(pNode))
1380	{
1381	/*
1382	* Validate the port forwarding config.
1383	*/
1384	if (!CFGMR3AreValuesValid(pNode, "Name\0Protocol\0UDP\0HostPort\0GuestPort\0GuestIP\0BindIP\0"))
1385	return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1386	N_("Unknown configuration in port forwarding"));
1387
1388	/* protocol type */
1389	bool fUDP;
1390	char szProtocol[32];
1391	int rc;
1392	GET_STRING(rc, pThis, pNode, "Protocol", szProtocol[0], sizeof(szProtocol));
1393	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1394	{
1395	fUDP = false;
1396	GET_BOOL(rc, pThis, pNode, "UDP", fUDP);
1397	}
1398	else if (RT_SUCCESS(rc))
1399	{
1400	if (!RTStrICmp(szProtocol, "TCP"))
1401	fUDP = false;
1402	else if (!RTStrICmp(szProtocol, "UDP"))
1403	fUDP = true;
1404	else
1405	return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
1406	N_("NAT#%d: Invalid configuration value for \"Protocol\": \"%s\""),
1407	iInstance, szProtocol);
1408	}
1409	else
1410	return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS,
1411	N_("NAT#%d: configuration query for \"Protocol\" failed"),
1412	iInstance);
1413	/* host port */
1414	int32_t iHostPort;
1415	GET_S32_STRICT(rc, pThis, pNode, "HostPort", iHostPort);
1416
1417	/* guest port */
1418	int32_t iGuestPort;
1419	GET_S32_STRICT(rc, pThis, pNode, "GuestPort", iGuestPort);
1420
1421	/* host address ("BindIP" name is rather unfortunate given "HostPort" to go with it) */
1422	struct in_addr BindIP;
1423	RT_ZERO(BindIP);
1424	GETIP_DEF(rc, pThis, pNode, BindIP, INADDR_ANY);
1425
1426	/* guest address */
1427	struct in_addr GuestIP;
1428	RT_ZERO(GuestIP);
1429	GETIP_DEF(rc, pThis, pNode, GuestIP, INADDR_ANY);
1430
1431	/*
1432	* Call slirp about it.
1433	*/
1434	if (slirp_add_redirect(pThis->pNATState, fUDP, BindIP, iHostPort, GuestIP, iGuestPort) < 0)
1435	return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_SETUP, RT_SRC_POS,
1436	N_("NAT#%d: configuration error: failed to set up "
1437	"redirection of %d to %d. Probably a conflict with "
1438	"existing services or other rules"), iInstance, iHostPort,
1439	iGuestPort);
1440	} /* for each redir rule */
1441
1442	return VINF_SUCCESS;
1443	}
1444
1445
1446	/**
1447	* Destruct a driver instance.
1448	*
1449	* Most VM resources are freed by the VM. This callback is provided so that any non-VM
1450	* resources can be freed correctly.
1451	*
1452	* @param pDrvIns The driver instance data.
1453	*/
1454	static DECLCALLBACK(void) drvNATDestruct(PPDMDRVINS pDrvIns)
1455	{
1456	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1457	LogFlow(("drvNATDestruct:\n"));
1458	PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
1459
1460	if (pThis->pNATState)
1461	{
1462	slirp_term(pThis->pNATState);
1463	slirp_deregister_statistics(pThis->pNATState, pDrvIns);
1464	#ifdef VBOX_WITH_STATISTICS
1465	# define DRV_PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1466	# define DRV_COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1467	# include "counters.h"
1468	#endif
1469	pThis->pNATState = NULL;
1470	}
1471
1472	RTReqQueueDestroy(pThis->hHostResQueue);
1473	pThis->hHostResQueue = NIL_RTREQQUEUE;
1474
1475	RTReqQueueDestroy(pThis->hSlirpReqQueue);
1476	pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1477
1478	RTReqQueueDestroy(pThis->hUrgRecvReqQueue);
1479	pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1480
1481	RTReqQueueDestroy(pThis->hRecvReqQueue);
1482	pThis->hRecvReqQueue = NIL_RTREQQUEUE;
1483
1484	RTSemEventDestroy(pThis->EventRecv);
1485	pThis->EventRecv = NIL_RTSEMEVENT;
1486
1487	RTSemEventDestroy(pThis->EventUrgRecv);
1488	pThis->EventUrgRecv = NIL_RTSEMEVENT;
1489
1490	if (RTCritSectIsInitialized(&pThis->DevAccessLock))
1491	RTCritSectDelete(&pThis->DevAccessLock);
1492
1493	if (RTCritSectIsInitialized(&pThis->XmitLock))
1494	RTCritSectDelete(&pThis->XmitLock);
1495
1496	#ifndef RT_OS_WINDOWS
1497	RTPipeClose(pThis->hPipeRead);
1498	RTPipeClose(pThis->hPipeWrite);
1499	#endif
1500
1501	#ifdef RT_OS_DARWIN
1502	/* Cleanup the DNS watcher. */
1503	CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1504	CFRetain(hRunLoopMain);
1505	CFRunLoopRemoveSource(hRunLoopMain, pThis->hRunLoopSrcDnsWatcher, kCFRunLoopCommonModes);
1506	CFRelease(hRunLoopMain);
1507	CFRelease(pThis->hRunLoopSrcDnsWatcher);
1508	pThis->hRunLoopSrcDnsWatcher = NULL;
1509	#endif
1510	}
1511
1512
1513	/**
1514	* Construct a NAT network transport driver instance.
1515	*
1516	* @copydoc FNPDMDRVCONSTRUCT
1517	*/
1518	static DECLCALLBACK(int) drvNATConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
1519	{
1520	RT_NOREF(fFlags);
1521	PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
1522	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1523	LogFlow(("drvNATConstruct:\n"));
1524
1525	/*
1526	* Init the static parts.
1527	*/
1528	pThis->pDrvIns = pDrvIns;
1529	pThis->pNATState = NULL;
1530	pThis->pszTFTPPrefix = NULL;
1531	pThis->pszBootFile = NULL;
1532	pThis->pszNextServer = NULL;
1533	pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1534	pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1535	pThis->hHostResQueue = NIL_RTREQQUEUE;
1536	pThis->EventRecv = NIL_RTSEMEVENT;
1537	pThis->EventUrgRecv = NIL_RTSEMEVENT;
1538	#ifdef RT_OS_DARWIN
1539	pThis->hRunLoopSrcDnsWatcher = NULL;
1540	#endif
1541
1542	/* IBase */
1543	pDrvIns->IBase.pfnQueryInterface = drvNATQueryInterface;
1544
1545	/* INetwork */
1546	pThis->INetworkUp.pfnBeginXmit = drvNATNetworkUp_BeginXmit;
1547	pThis->INetworkUp.pfnAllocBuf = drvNATNetworkUp_AllocBuf;
1548	pThis->INetworkUp.pfnFreeBuf = drvNATNetworkUp_FreeBuf;
1549	pThis->INetworkUp.pfnSendBuf = drvNATNetworkUp_SendBuf;
1550	pThis->INetworkUp.pfnEndXmit = drvNATNetworkUp_EndXmit;
1551	pThis->INetworkUp.pfnSetPromiscuousMode = drvNATNetworkUp_SetPromiscuousMode;
1552	pThis->INetworkUp.pfnNotifyLinkChanged = drvNATNetworkUp_NotifyLinkChanged;
1553
1554	/* NAT engine configuration */
1555	pThis->INetworkNATCfg.pfnRedirectRuleCommand = drvNATNetworkNatConfigRedirect;
1556	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE && !defined(RT_OS_DARWIN)
1557	/*
1558	* On OS X we stick to the old OS X specific notifications for
1559	* now. Elsewhere use IHostNameResolutionConfigurationChangeEvent
1560	* by enbaling HAVE_NOTIFICATION_FOR_DNS_UPDATE in libslirp.h.
1561	* This code is still in a bit of flux and is implemented and
1562	* enabled in steps to simplify more conservative backporting.
1563	*/
1564	pThis->INetworkNATCfg.pfnNotifyDnsChanged = drvNATNotifyDnsChanged;
1565	#else
1566	pThis->INetworkNATCfg.pfnNotifyDnsChanged = NULL;
1567	#endif
1568
1569	/*
1570	* Validate the config.
1571	*/
1572	if (!CFGMR3AreValuesValid(pCfg,
1573	"PassDomain\0TFTPPrefix\0BootFile\0Network"
1574	"\0NextServer\0DNSProxy\0BindIP\0UseHostResolver\0"
1575	"SlirpMTU\0AliasMode\0"
1576	"SockRcv\0SockSnd\0TcpRcv\0TcpSnd\0"
1577	"ICMPCacheLimit\0"
1578	"SoMaxConnection\0"
1579	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1580	"HostResolverMappings\0"
1581	#endif
1582	))
1583	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1584	N_("Unknown NAT configuration option, only supports PassDomain,"
1585	" TFTPPrefix, BootFile and Network"));
1586
1587	/*
1588	* Get the configuration settings.
1589	*/
1590	int rc;
1591	bool fPassDomain = true;
1592	GET_BOOL(rc, pThis, pCfg, "PassDomain", fPassDomain);
1593
1594	GET_STRING_ALLOC(rc, pThis, pCfg, "TFTPPrefix", pThis->pszTFTPPrefix);
1595	GET_STRING_ALLOC(rc, pThis, pCfg, "BootFile", pThis->pszBootFile);
1596	GET_STRING_ALLOC(rc, pThis, pCfg, "NextServer", pThis->pszNextServer);
1597
1598	int fDNSProxy = 0;
1599	GET_S32(rc, pThis, pCfg, "DNSProxy", fDNSProxy);
1600	int fUseHostResolver = 0;
1601	GET_S32(rc, pThis, pCfg, "UseHostResolver", fUseHostResolver);
1602	int MTU = 1500;
1603	GET_S32(rc, pThis, pCfg, "SlirpMTU", MTU);
1604	int i32AliasMode = 0;
1605	int i32MainAliasMode = 0;
1606	GET_S32(rc, pThis, pCfg, "AliasMode", i32MainAliasMode);
1607	int iIcmpCacheLimit = 100;
1608	GET_S32(rc, pThis, pCfg, "ICMPCacheLimit", iIcmpCacheLimit);
1609
1610	i32AliasMode \|= (i32MainAliasMode & 0x1 ? 0x1 : 0);
1611	i32AliasMode \|= (i32MainAliasMode & 0x2 ? 0x40 : 0);
1612	i32AliasMode \|= (i32MainAliasMode & 0x4 ? 0x4 : 0);
1613	int i32SoMaxConn = 10;
1614	GET_S32(rc, pThis, pCfg, "SoMaxConnection", i32SoMaxConn);
1615	/*
1616	* Query the network port interface.
1617	*/
1618	pThis->pIAboveNet = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKDOWN);
1619	if (!pThis->pIAboveNet)
1620	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1621	N_("Configuration error: the above device/driver didn't "
1622	"export the network port interface"));
1623	pThis->pIAboveConfig = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKCONFIG);
1624	if (!pThis->pIAboveConfig)
1625	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1626	N_("Configuration error: the above device/driver didn't "
1627	"export the network config interface"));
1628
1629	/* Generate a network address for this network card. */
1630	char szNetwork[32]; /* xxx.xxx.xxx.xxx/yy */
1631	GET_STRING(rc, pThis, pCfg, "Network", szNetwork[0], sizeof(szNetwork));
1632	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1633	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT%d: Configuration error: missing network"),
1634	pDrvIns->iInstance);
1635
1636	RTNETADDRIPV4 Network, Netmask;
1637
1638	rc = RTCidrStrToIPv4(szNetwork, &Network, &Netmask);
1639	if (RT_FAILURE(rc))
1640	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1641	N_("NAT#%d: Configuration error: network '%s' describes not a valid IPv4 network"),
1642	pDrvIns->iInstance, szNetwork);
1643
1644	/*
1645	* Initialize slirp.
1646	*/
1647	rc = slirp_init(&pThis->pNATState, RT_H2N_U32(Network.u), Netmask.u,
1648	fPassDomain, !!fUseHostResolver, i32AliasMode,
1649	iIcmpCacheLimit, pThis);
1650	if (RT_SUCCESS(rc))
1651	{
1652	slirp_set_dhcp_TFTP_prefix(pThis->pNATState, pThis->pszTFTPPrefix);
1653	slirp_set_dhcp_TFTP_bootfile(pThis->pNATState, pThis->pszBootFile);
1654	slirp_set_dhcp_next_server(pThis->pNATState, pThis->pszNextServer);
1655	slirp_set_dhcp_dns_proxy(pThis->pNATState, !!fDNSProxy);
1656	slirp_set_mtu(pThis->pNATState, MTU);
1657	slirp_set_somaxconn(pThis->pNATState, i32SoMaxConn);
1658	char *pszBindIP = NULL;
1659	GET_STRING_ALLOC(rc, pThis, pCfg, "BindIP", pszBindIP);
1660	rc = slirp_set_binding_address(pThis->pNATState, pszBindIP);
1661	if (rc != 0 && pszBindIP && *pszBindIP)
1662	LogRel(("NAT: Value of BindIP has been ignored\n"));
1663
1664	if(pszBindIP != NULL)
1665	MMR3HeapFree(pszBindIP);
1666	#define SLIRP_SET_TUNING_VALUE(name, setter) \
1667	do \
1668	{ \
1669	int len = 0; \
1670	rc = CFGMR3QueryS32(pCfg, name, &len); \
1671	if (RT_SUCCESS(rc)) \
1672	setter(pThis->pNATState, len); \
1673	} while(0)
1674
1675	SLIRP_SET_TUNING_VALUE("SockRcv", slirp_set_rcvbuf);
1676	SLIRP_SET_TUNING_VALUE("SockSnd", slirp_set_sndbuf);
1677	SLIRP_SET_TUNING_VALUE("TcpRcv", slirp_set_tcp_rcvspace);
1678	SLIRP_SET_TUNING_VALUE("TcpSnd", slirp_set_tcp_sndspace);
1679
1680	slirp_register_statistics(pThis->pNATState, pDrvIns);
1681	#ifdef VBOX_WITH_STATISTICS
1682	# define DRV_PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
1683	# define DRV_COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
1684	# include "counters.h"
1685	#endif
1686
1687	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1688	PCFGMNODE pMappingsCfg = CFGMR3GetChild(pCfg, "HostResolverMappings");
1689
1690	if (pMappingsCfg)
1691	{
1692	rc = drvNATConstructDNSMappings(pDrvIns->iInstance, pThis, pMappingsCfg);
1693	AssertRC(rc);
1694	}
1695	#endif
1696	rc = drvNATConstructRedir(pDrvIns->iInstance, pThis, pCfg, &Network);
1697	if (RT_SUCCESS(rc))
1698	{
1699	/*
1700	* Register a load done notification to get the MAC address into the slirp
1701	* engine after we loaded a guest state.
1702	*/
1703	rc = PDMDrvHlpSSMRegisterLoadDone(pDrvIns, drvNATLoadDone);
1704	AssertLogRelRCReturn(rc, rc);
1705
1706	rc = RTReqQueueCreate(&pThis->hSlirpReqQueue);
1707	AssertLogRelRCReturn(rc, rc);
1708
1709	rc = RTReqQueueCreate(&pThis->hRecvReqQueue);
1710	AssertLogRelRCReturn(rc, rc);
1711
1712	rc = RTReqQueueCreate(&pThis->hUrgRecvReqQueue);
1713	AssertLogRelRCReturn(rc, rc);
1714
1715	rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pRecvThread, pThis, drvNATRecv,
1716	drvNATRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATRX");
1717	AssertRCReturn(rc, rc);
1718
1719	rc = RTSemEventCreate(&pThis->EventRecv);
1720	AssertRCReturn(rc, rc);
1721
1722	rc = RTSemEventCreate(&pThis->EventUrgRecv);
1723	AssertRCReturn(rc, rc);
1724
1725	rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pUrgRecvThread, pThis, drvNATUrgRecv,
1726	drvNATUrgRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATURGRX");
1727	AssertRCReturn(rc, rc);
1728
1729	rc = RTReqQueueCreate(&pThis->hHostResQueue);
1730	AssertRCReturn(rc, rc);
1731
1732	rc = PDMDrvHlpThreadCreate(pThis->pDrvIns, &pThis->pHostResThread,
1733	pThis, drvNATHostResThread, drvNATHostResWakeup,
1734	64 * _1K, RTTHREADTYPE_IO, "HOSTRES");
1735	AssertRCReturn(rc, rc);
1736
1737	rc = RTCritSectInit(&pThis->DevAccessLock);
1738	AssertRCReturn(rc, rc);
1739
1740	rc = RTCritSectInit(&pThis->XmitLock);
1741	AssertRCReturn(rc, rc);
1742
1743	char szTmp[128];
1744	RTStrPrintf(szTmp, sizeof(szTmp), "nat%d", pDrvIns->iInstance);
1745	PDMDrvHlpDBGFInfoRegister(pDrvIns, szTmp, "NAT info.", drvNATInfo);
1746
1747	#ifndef RT_OS_WINDOWS
1748	/*
1749	* Create the control pipe.
1750	*/
1751	rc = RTPipeCreate(&pThis->hPipeRead, &pThis->hPipeWrite, 0 /fFlags/);
1752	AssertRCReturn(rc, rc);
1753	#else
1754	pThis->hWakeupEvent = CreateEvent(NULL, FALSE, FALSE, NULL); /* auto-reset event */
1755	slirp_register_external_event(pThis->pNATState, pThis->hWakeupEvent,
1756	VBOX_WAKEUP_EVENT_INDEX);
1757	#endif
1758
1759	rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pSlirpThread, pThis, drvNATAsyncIoThread,
1760	drvNATAsyncIoWakeup, 128 * _1K, RTTHREADTYPE_IO, "NAT");
1761	AssertRCReturn(rc, rc);
1762
1763	pThis->enmLinkState = pThis->enmLinkStateWant = PDMNETWORKLINKSTATE_UP;
1764
1765	#ifdef RT_OS_DARWIN
1766	/* Set up a watcher which notifies us everytime the DNS server changes. */
1767	int rc2 = VINF_SUCCESS;
1768	SCDynamicStoreContext SCDynStorCtx;
1769
1770	SCDynStorCtx.version = 0;
1771	SCDynStorCtx.info = pThis;
1772	SCDynStorCtx.retain = NULL;
1773	SCDynStorCtx.release = NULL;
1774	SCDynStorCtx.copyDescription = NULL;
1775
1776	SCDynamicStoreRef hDynStor = SCDynamicStoreCreate(NULL, CFSTR("org.virtualbox.drvnat"), drvNatDnsChanged, &SCDynStorCtx);
1777	if (hDynStor)
1778	{
1779	CFRunLoopSourceRef hRunLoopSrc = SCDynamicStoreCreateRunLoopSource(NULL, hDynStor, 0);
1780	if (hRunLoopSrc)
1781	{
1782	CFStringRef aWatchKeys[] =
1783	{
1784	CFSTR("State:/Network/Global/DNS")
1785	};
1786	CFArrayRef hArray = CFArrayCreate(NULL, (const void **)aWatchKeys, 1, &kCFTypeArrayCallBacks);
1787
1788	if (hArray)
1789	{
1790	if (SCDynamicStoreSetNotificationKeys(hDynStor, hArray, NULL))
1791	{
1792	CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1793	CFRetain(hRunLoopMain);
1794	CFRunLoopAddSource(hRunLoopMain, hRunLoopSrc, kCFRunLoopCommonModes);
1795	CFRelease(hRunLoopMain);
1796	pThis->hRunLoopSrcDnsWatcher = hRunLoopSrc;
1797	}
1798	else
1799	rc2 = VERR_NO_MEMORY;
1800
1801	CFRelease(hArray);
1802	}
1803	else
1804	rc2 = VERR_NO_MEMORY;
1805
1806	if (RT_FAILURE(rc2)) /* Keep the runloop source referenced for destruction. */
1807	CFRelease(hRunLoopSrc);
1808	}
1809	CFRelease(hDynStor);
1810	}
1811	else
1812	rc2 = VERR_NO_MEMORY;
1813
1814	if (RT_FAILURE(rc2))
1815	LogRel(("NAT#%d: Failed to install DNS change notifier. The guest might loose DNS access when switching networks on the host\n",
1816	pDrvIns->iInstance));
1817	#endif
1818
1819	/* might return VINF_NAT_DNS */
1820	return rc;
1821	}
1822
1823	/* failure path */
1824	slirp_term(pThis->pNATState);
1825	pThis->pNATState = NULL;
1826	}
1827	else
1828	{
1829	PDMDRV_SET_ERROR(pDrvIns, rc, N_("Unknown error during NAT networking setup: "));
1830	AssertMsgFailed(("Add error message for rc=%d (%Rrc)\n", rc, rc));
1831	}
1832
1833	return rc;
1834	}
1835
1836
1837	/**
1838	* NAT network transport driver registration record.
1839	*/
1840	const PDMDRVREG g_DrvNAT =
1841	{
1842	/* u32Version */
1843	PDM_DRVREG_VERSION,
1844	/* szName */
1845	"NAT",
1846	/* szRCMod */
1847	"",
1848	/* szR0Mod */
1849	"",
1850	/* pszDescription */
1851	"NAT Network Transport Driver",
1852	/* fFlags */
1853	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1854	/* fClass. */
1855	PDM_DRVREG_CLASS_NETWORK,
1856	/* cMaxInstances */
1857	~0U,
1858	/* cbInstance */
1859	sizeof(DRVNAT),
1860	/* pfnConstruct */
1861	drvNATConstruct,
1862	/* pfnDestruct */
1863	drvNATDestruct,
1864	/* pfnRelocate */
1865	NULL,
1866	/* pfnIOCtl */
1867	NULL,
1868	/* pfnPowerOn */
1869	drvNATPowerOn,
1870	/* pfnReset */
1871	NULL,
1872	/* pfnSuspend */
1873	NULL,
1874	/* pfnResume */
1875	drvNATResume,
1876	/* pfnAttach */
1877	NULL,
1878	/* pfnDetach */
1879	NULL,
1880	/* pfnPowerOff */
1881	NULL,
1882	/* pfnSoftReset */
1883	NULL,
1884	/* u32EndVersion */
1885	PDM_DRVREG_VERSION
1886	};
1887

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source: vbox/trunk/src/VBox/Devices/Network/DrvNAT.cpp@ 65710

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