DrvNAT.cpp@ 91881

Last change on this file since 91881 was 91872, checked in by vboxsync, 3 years ago
Devices/Network: Change the network drivers to access the CFGM API through the driver helper callback table only, bugref:10074
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File size: 66.3 KB

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1	/* $Id: DrvNAT.cpp 91872 2021-10-20 09:07:44Z vboxsync $ */
2	/** @file
3	* DrvNAT - NAT network transport driver.
4	*/
5
6	/*
7	* Copyright (C) 2006-2020 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(pdrvins, node, name, rc, type, type_name, var) \
81	do { \
82	(rc) = (pdrvins)->pHlpR3->pfnCFGMQuery ## type((node), name, &(var)); \
83	if (RT_FAILURE((rc)) && (rc) != VERR_CFGM_VALUE_NOT_FOUND) \
84	return PDMDrvHlpVMSetError((pdrvins), (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \"" name "\" " #type_name " failed"), \
85	(pdrvins)->iInstance); \
86	} while (0)
87
88	#define GET_ED_STRICT(pdrvins, node, name, rc, type, type_name, var) \
89	do { \
90	(rc) = (pdrvins)->pHlpR3->pfnCFGMQuery ## type((node), name, &(var)); \
91	if (RT_FAILURE((rc))) \
92	return PDMDrvHlpVMSetError((pdrvins), (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \"" name "\" " #type_name " failed"), \
93	(pdrvins)->iInstance); \
94	} while (0)
95
96	#define GET_EXTRADATA_N(pdrvins, node, name, rc, type, type_name, var, var_size) \
97	do { \
98	(rc) = (pdrvins)->pHlpR3->pfnCFGMQuery ## type((node), name, &(var), var_size); \
99	if (RT_FAILURE((rc)) && (rc) != VERR_CFGM_VALUE_NOT_FOUND) \
100	return PDMDrvHlpVMSetError((pdrvins), (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \"" name "\" " #type_name " failed"), \
101	(pdrvins)->iInstance); \
102	} while (0)
103
104	#define GET_BOOL(rc, pdrvins, node, name, var) \
105	GET_EXTRADATA(pdrvins, node, name, (rc), Bool, bolean, (var))
106	#define GET_STRING(rc, pdrvins, node, name, var, var_size) \
107	GET_EXTRADATA_N(pdrvins, node, name, (rc), String, string, (var), (var_size))
108	#define GET_STRING_ALLOC(rc, pdrvins, node, name, var) \
109	GET_EXTRADATA(pdrvins, node, name, (rc), StringAlloc, string, (var))
110	#define GET_S32(rc, pdrvins, node, name, var) \
111	GET_EXTRADATA(pdrvins, node, name, (rc), S32, int, (var))
112	#define GET_S32_STRICT(rc, pdrvins, node, name, var) \
113	GET_ED_STRICT(pdrvins, 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 DECLCALLBACK(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	/* Do not attempt to segment frames with invalid GSO parameters. */
442	if (PDMNetGsoIsValid(pGso, sizeof(*pGso), pSgBuf->cbUsed))
443	{
444	uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, pSgBuf->cbUsed); Assert(cSegs > 1);
445	for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
446	{
447	size_t cbSeg;
448	void *pvSeg;
449	m = slirp_ext_m_get(pThis->pNATState, pGso->cbHdrsTotal + pGso->cbMaxSeg, &pvSeg, &cbSeg);
450	if (!m)
451	break;
452
453	#if 1
454	uint32_t cbPayload, cbHdrs;
455	uint32_t offPayload = PDMNetGsoCarveSegment(pGso, pbFrame, pSgBuf->cbUsed,
456	iSeg, cSegs, (uint8_t *)pvSeg, &cbHdrs, &cbPayload);
457	memcpy((uint8_t *)pvSeg + cbHdrs, pbFrame + offPayload, cbPayload);
458
459	slirp_input(pThis->pNATState, m, cbPayload + cbHdrs);
460	#else
461	uint32_t cbSegFrame;
462	void pvSegFrame = PDMNetGsoCarveSegmentQD(pGso, (uint8_t )pbFrame, pSgBuf->cbUsed, abHdrScratch,
463	iSeg, cSegs, &cbSegFrame);
464	memcpy((uint8_t *)pvSeg, pvSegFrame, cbSegFrame);
465
466	slirp_input(pThis->pNATState, m, cbSegFrame);
467	#endif
468	}
469	}
470	}
471	}
472	drvNATFreeSgBuf(pThis, pSgBuf);
473
474	/** @todo Implement the VERR_TRY_AGAIN drvNATNetworkUp_AllocBuf semantics. */
475	}
476
477	/**
478	* @interface_method_impl{PDMINETWORKUP,pfnBeginXmit}
479	*/
480	static DECLCALLBACK(int) drvNATNetworkUp_BeginXmit(PPDMINETWORKUP pInterface, bool fOnWorkerThread)
481	{
482	RT_NOREF(fOnWorkerThread);
483	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
484	int rc = RTCritSectTryEnter(&pThis->XmitLock);
485	if (RT_FAILURE(rc))
486	{
487	/** @todo Kick the worker thread when we have one... */
488	rc = VERR_TRY_AGAIN;
489	}
490	return rc;
491	}
492
493	/**
494	* @interface_method_impl{PDMINETWORKUP,pfnAllocBuf}
495	*/
496	static DECLCALLBACK(int) drvNATNetworkUp_AllocBuf(PPDMINETWORKUP pInterface, size_t cbMin,
497	PCPDMNETWORKGSO pGso, PPPDMSCATTERGATHER ppSgBuf)
498	{
499	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
500	Assert(RTCritSectIsOwner(&pThis->XmitLock));
501
502	/*
503	* Drop the incoming frame if the NAT thread isn't running.
504	*/
505	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
506	{
507	Log(("drvNATNetowrkUp_AllocBuf: returns VERR_NET_NO_NETWORK\n"));
508	return VERR_NET_NO_NETWORK;
509	}
510
511	/*
512	* Allocate a scatter/gather buffer and an mbuf.
513	*/
514	PPDMSCATTERGATHER pSgBuf = (PPDMSCATTERGATHER)RTMemAlloc(sizeof(*pSgBuf));
515	if (!pSgBuf)
516	return VERR_NO_MEMORY;
517	if (!pGso)
518	{
519	/*
520	* Drop the frame if it is too big.
521	*/
522	if (cbMin >= DRVNAT_MAXFRAMESIZE)
523	{
524	Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
525	cbMin));
526	RTMemFree(pSgBuf);
527	return VERR_INVALID_PARAMETER;
528	}
529
530	pSgBuf->pvUser = NULL;
531	pSgBuf->pvAllocator = slirp_ext_m_get(pThis->pNATState, cbMin,
532	&pSgBuf->aSegs[0].pvSeg, &pSgBuf->aSegs[0].cbSeg);
533	if (!pSgBuf->pvAllocator)
534	{
535	RTMemFree(pSgBuf);
536	return VERR_TRY_AGAIN;
537	}
538	}
539	else
540	{
541	/*
542	* Drop the frame if its segment is too big.
543	*/
544	if (pGso->cbHdrsTotal + pGso->cbMaxSeg >= DRVNAT_MAXFRAMESIZE)
545	{
546	Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
547	pGso->cbHdrsTotal + pGso->cbMaxSeg));
548	RTMemFree(pSgBuf);
549	return VERR_INVALID_PARAMETER;
550	}
551
552	pSgBuf->pvUser = RTMemDup(pGso, sizeof(*pGso));
553	pSgBuf->pvAllocator = NULL;
554	pSgBuf->aSegs[0].cbSeg = RT_ALIGN_Z(cbMin, 16);
555	pSgBuf->aSegs[0].pvSeg = RTMemAlloc(pSgBuf->aSegs[0].cbSeg);
556	if (!pSgBuf->pvUser \|\| !pSgBuf->aSegs[0].pvSeg)
557	{
558	RTMemFree(pSgBuf->aSegs[0].pvSeg);
559	RTMemFree(pSgBuf->pvUser);
560	RTMemFree(pSgBuf);
561	return VERR_TRY_AGAIN;
562	}
563	}
564
565	/*
566	* Initialize the S/G buffer and return.
567	*/
568	pSgBuf->fFlags = PDMSCATTERGATHER_FLAGS_MAGIC \| PDMSCATTERGATHER_FLAGS_OWNER_1;
569	pSgBuf->cbUsed = 0;
570	pSgBuf->cbAvailable = pSgBuf->aSegs[0].cbSeg;
571	pSgBuf->cSegs = 1;
572
573	#if 0 /* poison */
574	memset(pSgBuf->aSegs[0].pvSeg, 'F', pSgBuf->aSegs[0].cbSeg);
575	#endif
576	*ppSgBuf = pSgBuf;
577	return VINF_SUCCESS;
578	}
579
580	/**
581	* @interface_method_impl{PDMINETWORKUP,pfnFreeBuf}
582	*/
583	static DECLCALLBACK(int) drvNATNetworkUp_FreeBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf)
584	{
585	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
586	Assert(RTCritSectIsOwner(&pThis->XmitLock));
587	drvNATFreeSgBuf(pThis, pSgBuf);
588	return VINF_SUCCESS;
589	}
590
591	/**
592	* @interface_method_impl{PDMINETWORKUP,pfnSendBuf}
593	*/
594	static DECLCALLBACK(int) drvNATNetworkUp_SendBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf, bool fOnWorkerThread)
595	{
596	RT_NOREF(fOnWorkerThread);
597	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
598	Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_OWNER_MASK) == PDMSCATTERGATHER_FLAGS_OWNER_1);
599	Assert(RTCritSectIsOwner(&pThis->XmitLock));
600
601	int rc;
602	if (pThis->pSlirpThread->enmState == PDMTHREADSTATE_RUNNING)
603	{
604	rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, NULL /ppReq/, 0 /cMillies/,
605	RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
606	(PFNRT)drvNATSendWorker, 2, pThis, pSgBuf);
607	if (RT_SUCCESS(rc))
608	{
609	drvNATNotifyNATThread(pThis, "drvNATNetworkUp_SendBuf");
610	return VINF_SUCCESS;
611	}
612
613	rc = VERR_NET_NO_BUFFER_SPACE;
614	}
615	else
616	rc = VERR_NET_DOWN;
617	drvNATFreeSgBuf(pThis, pSgBuf);
618	return rc;
619	}
620
621	/**
622	* @interface_method_impl{PDMINETWORKUP,pfnEndXmit}
623	*/
624	static DECLCALLBACK(void) drvNATNetworkUp_EndXmit(PPDMINETWORKUP pInterface)
625	{
626	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
627	RTCritSectLeave(&pThis->XmitLock);
628	}
629
630	/**
631	* Get the NAT thread out of poll/WSAWaitForMultipleEvents
632	*/
633	static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho)
634	{
635	RT_NOREF(pszWho);
636	int rc;
637	#ifndef RT_OS_WINDOWS
638	/* kick poll() */
639	size_t cbIgnored;
640	rc = RTPipeWrite(pThis->hPipeWrite, "", 1, &cbIgnored);
641	#else
642	/* kick WSAWaitForMultipleEvents */
643	rc = WSASetEvent(pThis->hWakeupEvent);
644	#endif
645	AssertRC(rc);
646	}
647
648	/**
649	* @interface_method_impl{PDMINETWORKUP,pfnSetPromiscuousMode}
650	*/
651	static DECLCALLBACK(void) drvNATNetworkUp_SetPromiscuousMode(PPDMINETWORKUP pInterface, bool fPromiscuous)
652	{
653	RT_NOREF(pInterface, fPromiscuous);
654	LogFlow(("drvNATNetworkUp_SetPromiscuousMode: fPromiscuous=%d\n", fPromiscuous));
655	/* nothing to do */
656	}
657
658	/**
659	* Worker function for drvNATNetworkUp_NotifyLinkChanged().
660	* @thread "NAT" thread.
661	*/
662	static DECLCALLBACK(void) drvNATNotifyLinkChangedWorker(PDRVNAT pThis, PDMNETWORKLINKSTATE enmLinkState)
663	{
664	pThis->enmLinkState = pThis->enmLinkStateWant = enmLinkState;
665	switch (enmLinkState)
666	{
667	case PDMNETWORKLINKSTATE_UP:
668	LogRel(("NAT: Link up\n"));
669	slirp_link_up(pThis->pNATState);
670	break;
671
672	case PDMNETWORKLINKSTATE_DOWN:
673	case PDMNETWORKLINKSTATE_DOWN_RESUME:
674	LogRel(("NAT: Link down\n"));
675	slirp_link_down(pThis->pNATState);
676	break;
677
678	default:
679	AssertMsgFailed(("drvNATNetworkUp_NotifyLinkChanged: unexpected link state %d\n", enmLinkState));
680	}
681	}
682
683	/**
684	* Notification on link status changes.
685	*
686	* @param pInterface Pointer to the interface structure containing the called function pointer.
687	* @param enmLinkState The new link state.
688	* @thread EMT
689	*/
690	static DECLCALLBACK(void) drvNATNetworkUp_NotifyLinkChanged(PPDMINETWORKUP pInterface, PDMNETWORKLINKSTATE enmLinkState)
691	{
692	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
693
694	LogFlow(("drvNATNetworkUp_NotifyLinkChanged: enmLinkState=%d\n", enmLinkState));
695
696	/* Don't queue new requests if the NAT thread is not running (e.g. paused,
697	* stopping), otherwise we would deadlock. Memorize the change. */
698	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
699	{
700	pThis->enmLinkStateWant = enmLinkState;
701	return;
702	}
703
704	PRTREQ pReq;
705	int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /cMillies/, RTREQFLAGS_VOID,
706	(PFNRT)drvNATNotifyLinkChangedWorker, 2, pThis, enmLinkState);
707	if (rc == VERR_TIMEOUT)
708	{
709	drvNATNotifyNATThread(pThis, "drvNATNetworkUp_NotifyLinkChanged");
710	rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
711	AssertRC(rc);
712	}
713	else
714	AssertRC(rc);
715	RTReqRelease(pReq);
716	}
717
718	static DECLCALLBACK(void) drvNATNotifyApplyPortForwardCommand(PDRVNAT pThis, bool fRemove,
719	bool fUdp, const char *pHostIp,
720	uint16_t u16HostPort, const char *pGuestIp, uint16_t u16GuestPort)
721	{
722	struct in_addr guestIp, hostIp;
723
724	if ( pHostIp == NULL
725	\|\| inet_aton(pHostIp, &hostIp) == 0)
726	hostIp.s_addr = INADDR_ANY;
727
728	if ( pGuestIp == NULL
729	\|\| inet_aton(pGuestIp, &guestIp) == 0)
730	guestIp.s_addr = pThis->GuestIP;
731
732	if (fRemove)
733	slirp_remove_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
734	else
735	slirp_add_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
736	}
737
738	static DECLCALLBACK(int) drvNATNetworkNatConfigRedirect(PPDMINETWORKNATCONFIG pInterface, bool fRemove,
739	bool fUdp, const char *pHostIp, uint16_t u16HostPort,
740	const char *pGuestIp, uint16_t u16GuestPort)
741	{
742	LogFlowFunc(("fRemove=%d, fUdp=%d, pHostIp=%s, u16HostPort=%u, pGuestIp=%s, u16GuestPort=%u\n",
743	RT_BOOL(fRemove), RT_BOOL(fUdp), pHostIp, u16HostPort, pGuestIp, u16GuestPort));
744	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
745	/* Execute the command directly if the VM is not running. */
746	int rc;
747	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
748	{
749	drvNATNotifyApplyPortForwardCommand(pThis, fRemove, fUdp, pHostIp,
750	u16HostPort, pGuestIp,u16GuestPort);
751	rc = VINF_SUCCESS;
752	}
753	else
754	{
755	PRTREQ pReq;
756	rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /cMillies/, RTREQFLAGS_VOID,
757	(PFNRT)drvNATNotifyApplyPortForwardCommand, 7, pThis, fRemove,
758	fUdp, pHostIp, u16HostPort, pGuestIp, u16GuestPort);
759	if (rc == VERR_TIMEOUT)
760	{
761	drvNATNotifyNATThread(pThis, "drvNATNetworkNatConfigRedirect");
762	rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
763	AssertRC(rc);
764	}
765	else
766	AssertRC(rc);
767
768	RTReqRelease(pReq);
769	}
770	return rc;
771	}
772
773	/**
774	* NAT thread handling the slirp stuff.
775	*
776	* The slirp implementation is single-threaded so we execute this enginre in a
777	* dedicated thread. We take care that this thread does not become the
778	* bottleneck: If the guest wants to send, a request is enqueued into the
779	* hSlirpReqQueue and handled asynchronously by this thread. If this thread
780	* wants to deliver packets to the guest, it enqueues a request into
781	* hRecvReqQueue which is later handled by the Recv thread.
782	*/
783	static DECLCALLBACK(int) drvNATAsyncIoThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
784	{
785	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
786	int nFDs = -1;
787	#ifdef RT_OS_WINDOWS
788	HANDLE *phEvents = slirp_get_events(pThis->pNATState);
789	unsigned int cBreak = 0;
790	#else /* RT_OS_WINDOWS */
791	unsigned int cPollNegRet = 0;
792	#endif /* !RT_OS_WINDOWS */
793
794	LogFlow(("drvNATAsyncIoThread: pThis=%p\n", pThis));
795
796	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
797	return VINF_SUCCESS;
798
799	if (pThis->enmLinkStateWant != pThis->enmLinkState)
800	drvNATNotifyLinkChangedWorker(pThis, pThis->enmLinkStateWant);
801
802	/*
803	* Polling loop.
804	*/
805	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
806	{
807	/*
808	* To prevent concurrent execution of sending/receiving threads
809	*/
810	#ifndef RT_OS_WINDOWS
811	nFDs = slirp_get_nsock(pThis->pNATState);
812	/* allocation for all sockets + Management pipe */
813	struct pollfd polls = (struct pollfd )RTMemAlloc((1 + nFDs) * sizeof(struct pollfd) + sizeof(uint32_t));
814	if (polls == NULL)
815	return VERR_NO_MEMORY;
816
817	/* don't pass the management pipe */
818	slirp_select_fill(pThis->pNATState, &nFDs, &polls[1]);
819
820	polls[0].fd = RTPipeToNative(pThis->hPipeRead);
821	/* POLLRDBAND usually doesn't used on Linux but seems used on Solaris */
822	polls[0].events = POLLRDNORM \| POLLPRI \| POLLRDBAND;
823	polls[0].revents = 0;
824
825	int cChangedFDs = poll(polls, nFDs + 1, slirp_get_timeout_ms(pThis->pNATState));
826	if (cChangedFDs < 0)
827	{
828	if (errno == EINTR)
829	{
830	Log2(("NAT: signal was caught while sleep on poll\n"));
831	/* No error, just process all outstanding requests but don't wait */
832	cChangedFDs = 0;
833	}
834	else if (cPollNegRet++ > 128)
835	{
836	LogRel(("NAT: Poll returns (%s) suppressed %d\n", strerror(errno), cPollNegRet));
837	cPollNegRet = 0;
838	}
839	}
840
841	if (cChangedFDs >= 0)
842	{
843	slirp_select_poll(pThis->pNATState, &polls[1], nFDs);
844	if (polls[0].revents & (POLLRDNORM\|POLLPRI\|POLLRDBAND))
845	{
846	/* drain the pipe
847	*
848	* Note! drvNATSend decoupled so we don't know how many times
849	* device's thread sends before we've entered multiplex,
850	* so to avoid false alarm drain pipe here to the very end
851	*
852	* @todo: Probably we should counter drvNATSend to count how
853	* deep pipe has been filed before drain.
854	*
855	*/
856	/** @todo XXX: Make it reading exactly we need to drain the
857	* pipe.*/
858	char ch;
859	size_t cbRead;
860	RTPipeRead(pThis->hPipeRead, &ch, 1, &cbRead);
861	}
862	}
863	/* process _all_ outstanding requests but don't wait */
864	RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
865	RTMemFree(polls);
866
867	#else /* RT_OS_WINDOWS */
868	nFDs = -1;
869	slirp_select_fill(pThis->pNATState, &nFDs);
870	DWORD dwEvent = WSAWaitForMultipleEvents(nFDs, phEvents, FALSE,
871	slirp_get_timeout_ms(pThis->pNATState),
872	/* :fAlertable */ TRUE);
873	AssertCompile(WSA_WAIT_EVENT_0 == 0);
874	if ( (/dwEvent < WSA_WAIT_EVENT_0 \|\|/ dwEvent > WSA_WAIT_EVENT_0 + nFDs - 1)
875	&& dwEvent != WSA_WAIT_TIMEOUT && dwEvent != WSA_WAIT_IO_COMPLETION)
876	{
877	int error = WSAGetLastError();
878	LogRel(("NAT: WSAWaitForMultipleEvents returned %d (error %d)\n", dwEvent, error));
879	RTAssertPanic();
880	}
881
882	if (dwEvent == WSA_WAIT_TIMEOUT)
883	{
884	/* only check for slow/fast timers */
885	slirp_select_poll(pThis->pNATState, /* fTimeout=*/true);
886	continue;
887	}
888	/* poll the sockets in any case */
889	Log2(("%s: poll\n", __FUNCTION__));
890	slirp_select_poll(pThis->pNATState, /* fTimeout=*/false);
891	/* process _all_ outstanding requests but don't wait */
892	RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
893	# ifdef VBOX_NAT_DELAY_HACK
894	if (cBreak++ > 128)
895	{
896	cBreak = 0;
897	RTThreadSleep(2);
898	}
899	# endif
900	#endif /* RT_OS_WINDOWS */
901	}
902
903	return VINF_SUCCESS;
904	}
905
906
907	/**
908	* Unblock the send thread so it can respond to a state change.
909	*
910	* @returns VBox status code.
911	* @param pDevIns The pcnet device instance.
912	* @param pThread The send thread.
913	*/
914	static DECLCALLBACK(int) drvNATAsyncIoWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
915	{
916	RT_NOREF(pThread);
917	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
918
919	drvNATNotifyNATThread(pThis, "drvNATAsyncIoWakeup");
920	return VINF_SUCCESS;
921	}
922
923
924	static DECLCALLBACK(int) drvNATHostResThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
925	{
926	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
927
928	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
929	return VINF_SUCCESS;
930
931	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
932	{
933	RTReqQueueProcess(pThis->hHostResQueue, RT_INDEFINITE_WAIT);
934	}
935
936	return VINF_SUCCESS;
937	}
938
939
940	static DECLCALLBACK(int) drvNATReqQueueInterrupt()
941	{
942	/*
943	* RTReqQueueProcess loops until request returns a warning or info
944	* status code (other than VINF_SUCCESS).
945	*/
946	return VINF_INTERRUPTED;
947	}
948
949
950	static DECLCALLBACK(int) drvNATHostResWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
951	{
952	RT_NOREF(pThread);
953	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
954	Assert(pThis != NULL);
955
956	int rc;
957	rc = RTReqQueueCallEx(pThis->hHostResQueue, NULL /ppReq/, 0 /cMillies/,
958	RTREQFLAGS_IPRT_STATUS \| RTREQFLAGS_NO_WAIT,
959	(PFNRT)drvNATReqQueueInterrupt, 0);
960	return rc;
961	}
962
963
964	/**
965	* Function called by slirp to check if it's possible to feed incoming data to the network port.
966	* @returns 1 if possible.
967	* @returns 0 if not possible.
968	*/
969	int slirp_can_output(void *pvUser)
970	{
971	RT_NOREF(pvUser);
972	return 1;
973	}
974
975	void slirp_push_recv_thread(void *pvUser)
976	{
977	PDRVNAT pThis = (PDRVNAT)pvUser;
978	Assert(pThis);
979	drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
980	}
981
982	void slirp_urg_output(void pvUser, struct mbuf m, const uint8_t *pu8Buf, int cb)
983	{
984	PDRVNAT pThis = (PDRVNAT)pvUser;
985	Assert(pThis);
986
987	/* don't queue new requests when the NAT thread is about to stop */
988	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
989	return;
990
991	ASMAtomicIncU32(&pThis->cUrgPkts);
992	int rc = RTReqQueueCallEx(pThis->hUrgRecvReqQueue, NULL /ppReq/, 0 /cMillies/, RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
993	(PFNRT)drvNATUrgRecvWorker, 4, pThis, pu8Buf, cb, m);
994	AssertRC(rc);
995	drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
996	}
997
998	/**
999	* Function called by slirp to wake up device after VERR_TRY_AGAIN
1000	*/
1001	void slirp_output_pending(void *pvUser)
1002	{
1003	PDRVNAT pThis = (PDRVNAT)pvUser;
1004	Assert(pThis);
1005	LogFlowFuncEnter();
1006	pThis->pIAboveNet->pfnXmitPending(pThis->pIAboveNet);
1007	LogFlowFuncLeave();
1008	}
1009
1010	/**
1011	* Function called by slirp to feed incoming data to the NIC.
1012	*/
1013	void slirp_output(void pvUser, struct mbuf m, const uint8_t *pu8Buf, int cb)
1014	{
1015	PDRVNAT pThis = (PDRVNAT)pvUser;
1016	Assert(pThis);
1017
1018	LogFlow(("slirp_output BEGIN %p %d\n", pu8Buf, cb));
1019	Log6(("slirp_output: pu8Buf=%p cb=%#x (pThis=%p)\n%.*Rhxd\n", pu8Buf, cb, pThis, cb, pu8Buf));
1020
1021	/* don't queue new requests when the NAT thread is about to stop */
1022	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
1023	return;
1024
1025	ASMAtomicIncU32(&pThis->cPkts);
1026	int rc = RTReqQueueCallEx(pThis->hRecvReqQueue, NULL /ppReq/, 0 /cMillies/, RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
1027	(PFNRT)drvNATRecvWorker, 4, pThis, pu8Buf, cb, m);
1028	AssertRC(rc);
1029	drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
1030	STAM_COUNTER_INC(&pThis->StatQueuePktSent);
1031	LogFlowFuncLeave();
1032	}
1033
1034
1035	/*
1036	* Call a function on the slirp thread.
1037	*/
1038	int slirp_call(void pvUser, PRTREQ ppReq, RTMSINTERVAL cMillies,
1039	unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
1040	{
1041	PDRVNAT pThis = (PDRVNAT)pvUser;
1042	Assert(pThis);
1043
1044	int rc;
1045
1046	va_list va;
1047	va_start(va, cArgs);
1048
1049	rc = RTReqQueueCallV(pThis->hSlirpReqQueue, ppReq, cMillies, fFlags, pfnFunction, cArgs, va);
1050
1051	va_end(va);
1052
1053	if (RT_SUCCESS(rc))
1054	drvNATNotifyNATThread(pThis, "slirp_vcall");
1055
1056	return rc;
1057	}
1058
1059
1060	/*
1061	* Call a function on the host resolver thread.
1062	*/
1063	int slirp_call_hostres(void pvUser, PRTREQ ppReq, RTMSINTERVAL cMillies,
1064	unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
1065	{
1066	PDRVNAT pThis = (PDRVNAT)pvUser;
1067	Assert(pThis);
1068
1069	int rc;
1070
1071	AssertReturn((pThis->hHostResQueue != NIL_RTREQQUEUE), VERR_INVALID_STATE);
1072	AssertReturn((pThis->pHostResThread != NULL), VERR_INVALID_STATE);
1073
1074	va_list va;
1075	va_start(va, cArgs);
1076
1077	rc = RTReqQueueCallV(pThis->hHostResQueue, ppReq, cMillies, fFlags,
1078	pfnFunction, cArgs, va);
1079
1080	va_end(va);
1081	return rc;
1082	}
1083
1084
1085	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE && !defined(RT_OS_DARWIN)
1086	/**
1087	* @interface_method_impl{PDMINETWORKNATCONFIG,pfnNotifyDnsChanged}
1088	*
1089	* We are notified that host's resolver configuration has changed. In
1090	* the current setup we don't get any details and just reread that
1091	* information ourselves.
1092	*/
1093	static DECLCALLBACK(void) drvNATNotifyDnsChanged(PPDMINETWORKNATCONFIG pInterface)
1094	{
1095	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
1096	drvNATUpdateDNS(pThis, /* fFlapLink */ true);
1097	}
1098	#endif
1099
1100	#ifdef RT_OS_DARWIN
1101	/**
1102	* Callback for the SystemConfiguration framework to notify us whenever the DNS
1103	* server changes.
1104	*
1105	* @returns nothing.
1106	* @param hDynStor The DynamicStore handle.
1107	* @param hChangedKey Array of changed keys we watch for.
1108	* @param pvUser Opaque user data (NAT driver instance).
1109	*/
1110	static DECLCALLBACK(void) drvNatDnsChanged(SCDynamicStoreRef hDynStor, CFArrayRef hChangedKeys, void *pvUser)
1111	{
1112	PDRVNAT pThis = (PDRVNAT)pvUser;
1113
1114	Log2(("NAT: System configuration has changed\n"));
1115
1116	/* Check if any of parameters we are interested in were actually changed. If the size
1117	* of hChangedKeys is 0, it means that SCDynamicStore has been restarted. */
1118	if (hChangedKeys && CFArrayGetCount(hChangedKeys) > 0)
1119	{
1120	/* Look to the updated parameters in particular. */
1121	CFStringRef pDNSKey = CFSTR("State:/Network/Global/DNS");
1122
1123	if (CFArrayContainsValue(hChangedKeys, CFRangeMake(0, CFArrayGetCount(hChangedKeys)), pDNSKey))
1124	{
1125	LogRel(("NAT: DNS servers changed, triggering reconnect\n"));
1126	#if 0
1127	CFDictionaryRef hDnsDict = (CFDictionaryRef)SCDynamicStoreCopyValue(hDynStor, pDNSKey);
1128	if (hDnsDict)
1129	{
1130	CFArrayRef hArrAddresses = (CFArrayRef)CFDictionaryGetValue(hDnsDict, kSCPropNetDNSServerAddresses);
1131	if (hArrAddresses && CFArrayGetCount(hArrAddresses) > 0)
1132	{
1133	/* Dump DNS servers list. */
1134	for (int i = 0; i < CFArrayGetCount(hArrAddresses); i++)
1135	{
1136	CFStringRef pDNSAddrStr = (CFStringRef)CFArrayGetValueAtIndex(hArrAddresses, i);
1137	const char *pszDNSAddr = pDNSAddrStr ? CFStringGetCStringPtr(pDNSAddrStr, CFStringGetSystemEncoding()) : NULL;
1138	LogRel(("NAT: New DNS server#%d: %s\n", i, pszDNSAddr ? pszDNSAddr : "None"));
1139	}
1140	}
1141	else
1142	LogRel(("NAT: DNS server list is empty (1)\n"));
1143
1144	CFRelease(hDnsDict);
1145	}
1146	else
1147	LogRel(("NAT: DNS server list is empty (2)\n"));
1148	#else
1149	RT_NOREF(hDynStor);
1150	#endif
1151	drvNATUpdateDNS(pThis, /* fFlapLink */ true);
1152	}
1153	else
1154	Log2(("NAT: No DNS changes detected\n"));
1155	}
1156	else
1157	Log2(("NAT: SCDynamicStore has been restarted\n"));
1158	}
1159	#endif
1160
1161	/**
1162	* @interface_method_impl{PDMIBASE,pfnQueryInterface}
1163	*/
1164	static DECLCALLBACK(void ) drvNATQueryInterface(PPDMIBASE pInterface, const char pszIID)
1165	{
1166	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
1167	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1168
1169	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
1170	PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKUP, &pThis->INetworkUp);
1171	PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKNATCONFIG, &pThis->INetworkNATCfg);
1172	return NULL;
1173	}
1174
1175
1176	/**
1177	* Get the MAC address into the slirp stack.
1178	*
1179	* Called by drvNATLoadDone and drvNATPowerOn.
1180	*/
1181	static void drvNATSetMac(PDRVNAT pThis)
1182	{
1183	#if 0 /* XXX: do we still need this for anything? */
1184	if (pThis->pIAboveConfig)
1185	{
1186	RTMAC Mac;
1187	pThis->pIAboveConfig->pfnGetMac(pThis->pIAboveConfig, &Mac);
1188	}
1189	#else
1190	RT_NOREF(pThis);
1191	#endif
1192	}
1193
1194
1195	/**
1196	* After loading we have to pass the MAC address of the ethernet device to the slirp stack.
1197	* Otherwise the guest is not reachable until it performs a DHCP request or an ARP request
1198	* (usually done during guest boot).
1199	*/
1200	static DECLCALLBACK(int) drvNATLoadDone(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM)
1201	{
1202	RT_NOREF(pSSM);
1203	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1204	drvNATSetMac(pThis);
1205	return VINF_SUCCESS;
1206	}
1207
1208
1209	/**
1210	* Some guests might not use DHCP to retrieve an IP but use a static IP.
1211	*/
1212	static DECLCALLBACK(void) drvNATPowerOn(PPDMDRVINS pDrvIns)
1213	{
1214	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1215	drvNATSetMac(pThis);
1216	}
1217
1218
1219	/**
1220	* @interface_method_impl{PDMDRVREG,pfnResume}
1221	*/
1222	static DECLCALLBACK(void) drvNATResume(PPDMDRVINS pDrvIns)
1223	{
1224	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1225	VMRESUMEREASON enmReason = PDMDrvHlpVMGetResumeReason(pDrvIns);
1226
1227	switch (enmReason)
1228	{
1229	case VMRESUMEREASON_HOST_RESUME:
1230	bool fFlapLink;
1231	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE
1232	/* let event handler do it if necessary */
1233	fFlapLink = false;
1234	#else
1235	/* XXX: when in doubt, use brute force */
1236	fFlapLink = true;
1237	#endif
1238	drvNATUpdateDNS(pThis, fFlapLink);
1239	return;
1240	default: /* Ignore every other resume reason. */
1241	/* do nothing */
1242	return;
1243	}
1244	}
1245
1246
1247	static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis)
1248	{
1249	slirpReleaseDnsSettings(pThis->pNATState);
1250	slirpInitializeDnsSettings(pThis->pNATState);
1251	return VINF_SUCCESS;
1252	}
1253
1254	/**
1255	* This function at this stage could be called from two places, but both from non-NAT thread,
1256	* - drvNATResume (EMT?)
1257	* - drvNatDnsChanged (darwin, GUI or main) "listener"
1258	* When Main's interface IHost will support host network configuration change event on every host,
1259	* we won't call it from drvNATResume, but from listener of Main event in the similar way it done
1260	* for port-forwarding, and it wan't be on GUI/main thread, but on EMT thread only.
1261	*
1262	* Thread here is important, because we need to change DNS server list and domain name (+ perhaps,
1263	* search string) at runtime (VBOX_NAT_ENFORCE_INTERNAL_DNS_UPDATE), we can do it safely on NAT thread,
1264	* so with changing other variables (place where we handle update) the main mechanism of update
1265	* _won't_ be changed, the only thing will change is drop of fFlapLink parameter.
1266	*/
1267	DECLINLINE(void) drvNATUpdateDNS(PDRVNAT pThis, bool fFlapLink)
1268	{
1269	int strategy = slirp_host_network_configuration_change_strategy_selector(pThis->pNATState);
1270	switch (strategy)
1271	{
1272	case VBOX_NAT_DNS_DNSPROXY:
1273	{
1274	/**
1275	* XXX: Here or in _strategy_selector we should deal with network change
1276	* in "network change" scenario domain name change we have to update guest lease
1277	* forcibly.
1278	* Note at that built-in dhcp also updates DNS information on NAT thread.
1279	*/
1280	/**
1281	* It's unsafe to to do it directly on non-NAT thread
1282	* so we schedule the worker and kick the NAT thread.
1283	*/
1284	int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, NULL /ppReq/, 0 /cMillies/,
1285	RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
1286	(PFNRT)drvNATReinitializeHostNameResolving, 1, pThis);
1287	if (RT_SUCCESS(rc))
1288	drvNATNotifyNATThread(pThis, "drvNATUpdateDNS");
1289
1290	return;
1291	}
1292
1293	case VBOX_NAT_DNS_EXTERNAL:
1294	/*
1295	* Host resumed from a suspend and the network might have changed.
1296	* Disconnect the guest from the network temporarily to let it pick up the changes.
1297	*/
1298	if (fFlapLink)
1299	pThis->pIAboveConfig->pfnSetLinkState(pThis->pIAboveConfig,
1300	PDMNETWORKLINKSTATE_DOWN_RESUME);
1301	return;
1302
1303	case VBOX_NAT_DNS_HOSTRESOLVER:
1304	default:
1305	return;
1306	}
1307	}
1308
1309
1310	/**
1311	* Info handler.
1312	*/
1313	static DECLCALLBACK(void) drvNATInfo(PPDMDRVINS pDrvIns, PCDBGFINFOHLP pHlp, const char *pszArgs)
1314	{
1315	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1316	slirp_info(pThis->pNATState, pHlp, pszArgs);
1317	}
1318
1319	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1320	static int drvNATConstructDNSMappings(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pMappingsCfg)
1321	{
1322	PPDMDRVINS pDrvIns = pThis->pDrvIns;
1323	PCPDMDRVHLPR3 pHlp = pDrvIns->pHlpR3;
1324
1325	RT_NOREF(iInstance);
1326	int rc = VINF_SUCCESS;
1327	LogFlowFunc(("ENTER: iInstance:%d\n", iInstance));
1328	for (PCFGMNODE pNode = pHlp->pfnCFGMGetFirstChild(pMappingsCfg); pNode; pNode = pHlp->pfnCFGMGetNextChild(pNode))
1329	{
1330	if (!pHlp->pfnCFGMAreValuesValid(pNode, "HostName\0HostNamePattern\0HostIP\0"))
1331	return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1332	N_("Unknown configuration in dns mapping"));
1333	char szHostNameOrPattern[255];
1334	bool fPattern = false;
1335	RT_ZERO(szHostNameOrPattern);
1336	GET_STRING(rc, pDrvIns, pNode, "HostName", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1337	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1338	{
1339	GET_STRING(rc, pDrvIns, pNode, "HostNamePattern", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1340	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1341	{
1342	char szNodeName[225];
1343	RT_ZERO(szNodeName);
1344	pHlp->pfnCFGMGetName(pNode, szNodeName, sizeof(szNodeName));
1345	LogRel(("NAT: Neither 'HostName' nor 'HostNamePattern' is specified for mapping %s\n", szNodeName));
1346	continue;
1347	}
1348	fPattern = true;
1349	}
1350	struct in_addr HostIP;
1351	RT_ZERO(HostIP);
1352	GETIP_DEF(rc, pDrvIns, pNode, HostIP, INADDR_ANY);
1353	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1354	{
1355	LogRel(("NAT: DNS mapping %s is ignored (address not pointed)\n", szHostNameOrPattern));
1356	continue;
1357	}
1358	slirp_add_host_resolver_mapping(pThis->pNATState, szHostNameOrPattern, fPattern, HostIP.s_addr);
1359	}
1360	LogFlowFunc(("LEAVE: %Rrc\n", rc));
1361	return rc;
1362	}
1363	#endif /* !VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER */
1364
1365
1366	/**
1367	* Sets up the redirectors.
1368	*
1369	* @returns VBox status code.
1370	* @param pCfg The configuration handle.
1371	*/
1372	static int drvNATConstructRedir(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pCfg, PRTNETADDRIPV4 pNetwork)
1373	{
1374	PPDMDRVINS pDrvIns = pThis->pDrvIns;
1375	PCPDMDRVHLPR3 pHlp = pDrvIns->pHlpR3;
1376
1377	RT_NOREF(pNetwork); /** @todo figure why pNetwork isn't used */
1378
1379	PCFGMNODE pPFTree = CFGMR3GetChild(pCfg, "PortForwarding");
1380	if (pPFTree == NULL)
1381	return VINF_SUCCESS;
1382
1383	/*
1384	* Enumerate redirections.
1385	*/
1386	for (PCFGMNODE pNode = pHlp->pfnCFGMGetFirstChild(pPFTree); pNode; pNode = pHlp->pfnCFGMGetNextChild(pNode))
1387	{
1388	/*
1389	* Validate the port forwarding config.
1390	*/
1391	if (!pHlp->pfnCFGMAreValuesValid(pNode, "Name\0Protocol\0UDP\0HostPort\0GuestPort\0GuestIP\0BindIP\0"))
1392	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1393	N_("Unknown configuration in port forwarding"));
1394
1395	/* protocol type */
1396	bool fUDP;
1397	char szProtocol[32];
1398	int rc;
1399	GET_STRING(rc, pDrvIns, pNode, "Protocol", szProtocol[0], sizeof(szProtocol));
1400	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1401	{
1402	fUDP = false;
1403	GET_BOOL(rc, pDrvIns, pNode, "UDP", fUDP);
1404	}
1405	else if (RT_SUCCESS(rc))
1406	{
1407	if (!RTStrICmp(szProtocol, "TCP"))
1408	fUDP = false;
1409	else if (!RTStrICmp(szProtocol, "UDP"))
1410	fUDP = true;
1411	else
1412	return PDMDrvHlpVMSetError(pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
1413	N_("NAT#%d: Invalid configuration value for \"Protocol\": \"%s\""),
1414	iInstance, szProtocol);
1415	}
1416	else
1417	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1418	N_("NAT#%d: configuration query for \"Protocol\" failed"),
1419	iInstance);
1420	/* host port */
1421	int32_t iHostPort;
1422	GET_S32_STRICT(rc, pDrvIns, pNode, "HostPort", iHostPort);
1423
1424	/* guest port */
1425	int32_t iGuestPort;
1426	GET_S32_STRICT(rc, pDrvIns, pNode, "GuestPort", iGuestPort);
1427
1428	/* host address ("BindIP" name is rather unfortunate given "HostPort" to go with it) */
1429	struct in_addr BindIP;
1430	RT_ZERO(BindIP);
1431	GETIP_DEF(rc, pDrvIns, pNode, BindIP, INADDR_ANY);
1432
1433	/* guest address */
1434	struct in_addr GuestIP;
1435	RT_ZERO(GuestIP);
1436	GETIP_DEF(rc, pDrvIns, pNode, GuestIP, INADDR_ANY);
1437
1438	/*
1439	* Call slirp about it.
1440	*/
1441	if (slirp_add_redirect(pThis->pNATState, fUDP, BindIP, iHostPort, GuestIP, iGuestPort) < 0)
1442	return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_SETUP, RT_SRC_POS,
1443	N_("NAT#%d: configuration error: failed to set up "
1444	"redirection of %d to %d. Probably a conflict with "
1445	"existing services or other rules"), iInstance, iHostPort,
1446	iGuestPort);
1447	} /* for each redir rule */
1448
1449	return VINF_SUCCESS;
1450	}
1451
1452
1453	/**
1454	* Destruct a driver instance.
1455	*
1456	* Most VM resources are freed by the VM. This callback is provided so that any non-VM
1457	* resources can be freed correctly.
1458	*
1459	* @param pDrvIns The driver instance data.
1460	*/
1461	static DECLCALLBACK(void) drvNATDestruct(PPDMDRVINS pDrvIns)
1462	{
1463	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1464	LogFlow(("drvNATDestruct:\n"));
1465	PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
1466
1467	if (pThis->pNATState)
1468	{
1469	slirp_term(pThis->pNATState);
1470	slirp_deregister_statistics(pThis->pNATState, pDrvIns);
1471	#ifdef VBOX_WITH_STATISTICS
1472	# define DRV_PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1473	# define DRV_COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1474	# include "counters.h"
1475	#endif
1476	pThis->pNATState = NULL;
1477	}
1478
1479	RTReqQueueDestroy(pThis->hHostResQueue);
1480	pThis->hHostResQueue = NIL_RTREQQUEUE;
1481
1482	RTReqQueueDestroy(pThis->hSlirpReqQueue);
1483	pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1484
1485	RTReqQueueDestroy(pThis->hUrgRecvReqQueue);
1486	pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1487
1488	RTReqQueueDestroy(pThis->hRecvReqQueue);
1489	pThis->hRecvReqQueue = NIL_RTREQQUEUE;
1490
1491	RTSemEventDestroy(pThis->EventRecv);
1492	pThis->EventRecv = NIL_RTSEMEVENT;
1493
1494	RTSemEventDestroy(pThis->EventUrgRecv);
1495	pThis->EventUrgRecv = NIL_RTSEMEVENT;
1496
1497	if (RTCritSectIsInitialized(&pThis->DevAccessLock))
1498	RTCritSectDelete(&pThis->DevAccessLock);
1499
1500	if (RTCritSectIsInitialized(&pThis->XmitLock))
1501	RTCritSectDelete(&pThis->XmitLock);
1502
1503	#ifndef RT_OS_WINDOWS
1504	RTPipeClose(pThis->hPipeRead);
1505	RTPipeClose(pThis->hPipeWrite);
1506	#endif
1507
1508	#ifdef RT_OS_DARWIN
1509	/* Cleanup the DNS watcher. */
1510	if (pThis->hRunLoopSrcDnsWatcher != NULL)
1511	{
1512	CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1513	CFRetain(hRunLoopMain);
1514	CFRunLoopRemoveSource(hRunLoopMain, pThis->hRunLoopSrcDnsWatcher, kCFRunLoopCommonModes);
1515	CFRelease(hRunLoopMain);
1516	CFRelease(pThis->hRunLoopSrcDnsWatcher);
1517	pThis->hRunLoopSrcDnsWatcher = NULL;
1518	}
1519	#endif
1520	}
1521
1522
1523	/**
1524	* Construct a NAT network transport driver instance.
1525	*
1526	* @copydoc FNPDMDRVCONSTRUCT
1527	*/
1528	static DECLCALLBACK(int) drvNATConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
1529	{
1530	RT_NOREF(fFlags);
1531	PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
1532	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1533
1534	LogFlow(("drvNATConstruct:\n"));
1535
1536	/*
1537	* Init the static parts.
1538	*/
1539	pThis->pDrvIns = pDrvIns;
1540	pThis->pNATState = NULL;
1541	pThis->pszTFTPPrefix = NULL;
1542	pThis->pszBootFile = NULL;
1543	pThis->pszNextServer = NULL;
1544	pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1545	pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1546	pThis->hHostResQueue = NIL_RTREQQUEUE;
1547	pThis->EventRecv = NIL_RTSEMEVENT;
1548	pThis->EventUrgRecv = NIL_RTSEMEVENT;
1549	#ifdef RT_OS_DARWIN
1550	pThis->hRunLoopSrcDnsWatcher = NULL;
1551	#endif
1552
1553	/* IBase */
1554	pDrvIns->IBase.pfnQueryInterface = drvNATQueryInterface;
1555
1556	/* INetwork */
1557	pThis->INetworkUp.pfnBeginXmit = drvNATNetworkUp_BeginXmit;
1558	pThis->INetworkUp.pfnAllocBuf = drvNATNetworkUp_AllocBuf;
1559	pThis->INetworkUp.pfnFreeBuf = drvNATNetworkUp_FreeBuf;
1560	pThis->INetworkUp.pfnSendBuf = drvNATNetworkUp_SendBuf;
1561	pThis->INetworkUp.pfnEndXmit = drvNATNetworkUp_EndXmit;
1562	pThis->INetworkUp.pfnSetPromiscuousMode = drvNATNetworkUp_SetPromiscuousMode;
1563	pThis->INetworkUp.pfnNotifyLinkChanged = drvNATNetworkUp_NotifyLinkChanged;
1564
1565	/* NAT engine configuration */
1566	pThis->INetworkNATCfg.pfnRedirectRuleCommand = drvNATNetworkNatConfigRedirect;
1567	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE && !defined(RT_OS_DARWIN)
1568	/*
1569	* On OS X we stick to the old OS X specific notifications for
1570	* now. Elsewhere use IHostNameResolutionConfigurationChangeEvent
1571	* by enbaling HAVE_NOTIFICATION_FOR_DNS_UPDATE in libslirp.h.
1572	* This code is still in a bit of flux and is implemented and
1573	* enabled in steps to simplify more conservative backporting.
1574	*/
1575	pThis->INetworkNATCfg.pfnNotifyDnsChanged = drvNATNotifyDnsChanged;
1576	#else
1577	pThis->INetworkNATCfg.pfnNotifyDnsChanged = NULL;
1578	#endif
1579
1580	/*
1581	* Validate the config.
1582	*/
1583	PDMDRV_VALIDATE_CONFIG_RETURN(pDrvIns,
1584	"PassDomain"
1585	"\|TFTPPrefix"
1586	"\|BootFile"
1587	"\|Network"
1588	"\|NextServer"
1589	"\|DNSProxy"
1590	"\|BindIP"
1591	"\|UseHostResolver"
1592	"\|SlirpMTU"
1593	"\|AliasMode"
1594	"\|SockRcv"
1595	"\|SockSnd"
1596	"\|TcpRcv"
1597	"\|TcpSnd"
1598	"\|ICMPCacheLimit"
1599	"\|SoMaxConnection"
1600	//#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1601	"\|HostResolverMappings"
1602	//#endif
1603	, "");
1604
1605	/*
1606	* Get the configuration settings.
1607	*/
1608	int rc;
1609	bool fPassDomain = true;
1610	GET_BOOL(rc, pDrvIns, pCfg, "PassDomain", fPassDomain);
1611
1612	GET_STRING_ALLOC(rc, pDrvIns, pCfg, "TFTPPrefix", pThis->pszTFTPPrefix);
1613	GET_STRING_ALLOC(rc, pDrvIns, pCfg, "BootFile", pThis->pszBootFile);
1614	GET_STRING_ALLOC(rc, pDrvIns, pCfg, "NextServer", pThis->pszNextServer);
1615
1616	int fDNSProxy = 0;
1617	GET_S32(rc, pDrvIns, pCfg, "DNSProxy", fDNSProxy);
1618	int fUseHostResolver = 0;
1619	GET_S32(rc, pDrvIns, pCfg, "UseHostResolver", fUseHostResolver);
1620	int MTU = 1500;
1621	GET_S32(rc, pDrvIns, pCfg, "SlirpMTU", MTU);
1622	int i32AliasMode = 0;
1623	int i32MainAliasMode = 0;
1624	GET_S32(rc, pDrvIns, pCfg, "AliasMode", i32MainAliasMode);
1625	int iIcmpCacheLimit = 100;
1626	GET_S32(rc, pDrvIns, pCfg, "ICMPCacheLimit", iIcmpCacheLimit);
1627
1628	i32AliasMode \|= (i32MainAliasMode & 0x1 ? 0x1 : 0);
1629	i32AliasMode \|= (i32MainAliasMode & 0x2 ? 0x40 : 0);
1630	i32AliasMode \|= (i32MainAliasMode & 0x4 ? 0x4 : 0);
1631	int i32SoMaxConn = 10;
1632	GET_S32(rc, pDrvIns, pCfg, "SoMaxConnection", i32SoMaxConn);
1633	/*
1634	* Query the network port interface.
1635	*/
1636	pThis->pIAboveNet = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKDOWN);
1637	if (!pThis->pIAboveNet)
1638	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1639	N_("Configuration error: the above device/driver didn't "
1640	"export the network port interface"));
1641	pThis->pIAboveConfig = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKCONFIG);
1642	if (!pThis->pIAboveConfig)
1643	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1644	N_("Configuration error: the above device/driver didn't "
1645	"export the network config interface"));
1646
1647	/* Generate a network address for this network card. */
1648	char szNetwork[32]; /* xxx.xxx.xxx.xxx/yy */
1649	GET_STRING(rc, pDrvIns, pCfg, "Network", szNetwork[0], sizeof(szNetwork));
1650	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1651	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT%d: Configuration error: missing network"),
1652	pDrvIns->iInstance);
1653
1654	RTNETADDRIPV4 Network, Netmask;
1655
1656	rc = RTCidrStrToIPv4(szNetwork, &Network, &Netmask);
1657	if (RT_FAILURE(rc))
1658	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1659	N_("NAT#%d: Configuration error: network '%s' describes not a valid IPv4 network"),
1660	pDrvIns->iInstance, szNetwork);
1661
1662	/*
1663	* Initialize slirp.
1664	*/
1665	rc = slirp_init(&pThis->pNATState, RT_H2N_U32(Network.u), Netmask.u,
1666	fPassDomain, !!fUseHostResolver, i32AliasMode,
1667	iIcmpCacheLimit, pThis);
1668	if (RT_SUCCESS(rc))
1669	{
1670	slirp_set_dhcp_TFTP_prefix(pThis->pNATState, pThis->pszTFTPPrefix);
1671	slirp_set_dhcp_TFTP_bootfile(pThis->pNATState, pThis->pszBootFile);
1672	slirp_set_dhcp_next_server(pThis->pNATState, pThis->pszNextServer);
1673	slirp_set_dhcp_dns_proxy(pThis->pNATState, !!fDNSProxy);
1674	slirp_set_mtu(pThis->pNATState, MTU);
1675	slirp_set_somaxconn(pThis->pNATState, i32SoMaxConn);
1676
1677	char *pszBindIP = NULL;
1678	GET_STRING_ALLOC(rc, pDrvIns, pCfg, "BindIP", pszBindIP);
1679	slirp_set_binding_address(pThis->pNATState, pszBindIP);
1680	if (pszBindIP != NULL)
1681	MMR3HeapFree(pszBindIP);
1682
1683	#define SLIRP_SET_TUNING_VALUE(name, setter) \
1684	do \
1685	{ \
1686	int len = 0; \
1687	rc = CFGMR3QueryS32(pCfg, name, &len); \
1688	if (RT_SUCCESS(rc)) \
1689	setter(pThis->pNATState, len); \
1690	} while(0)
1691
1692	SLIRP_SET_TUNING_VALUE("SockRcv", slirp_set_rcvbuf);
1693	SLIRP_SET_TUNING_VALUE("SockSnd", slirp_set_sndbuf);
1694	SLIRP_SET_TUNING_VALUE("TcpRcv", slirp_set_tcp_rcvspace);
1695	SLIRP_SET_TUNING_VALUE("TcpSnd", slirp_set_tcp_sndspace);
1696
1697	slirp_register_statistics(pThis->pNATState, pDrvIns);
1698	#ifdef VBOX_WITH_STATISTICS
1699	# define DRV_PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
1700	# define DRV_COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
1701	# include "counters.h"
1702	#endif
1703
1704	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1705	PCFGMNODE pMappingsCfg = CFGMR3GetChild(pCfg, "HostResolverMappings");
1706
1707	if (pMappingsCfg)
1708	{
1709	rc = drvNATConstructDNSMappings(pDrvIns->iInstance, pThis, pMappingsCfg);
1710	AssertRC(rc);
1711	}
1712	#endif
1713	rc = drvNATConstructRedir(pDrvIns->iInstance, pThis, pCfg, &Network);
1714	if (RT_SUCCESS(rc))
1715	{
1716	/*
1717	* Register a load done notification to get the MAC address into the slirp
1718	* engine after we loaded a guest state.
1719	*/
1720	rc = PDMDrvHlpSSMRegisterLoadDone(pDrvIns, drvNATLoadDone);
1721	AssertLogRelRCReturn(rc, rc);
1722
1723	rc = RTReqQueueCreate(&pThis->hSlirpReqQueue);
1724	AssertLogRelRCReturn(rc, rc);
1725
1726	rc = RTReqQueueCreate(&pThis->hRecvReqQueue);
1727	AssertLogRelRCReturn(rc, rc);
1728
1729	rc = RTReqQueueCreate(&pThis->hUrgRecvReqQueue);
1730	AssertLogRelRCReturn(rc, rc);
1731
1732	rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pRecvThread, pThis, drvNATRecv,
1733	drvNATRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATRX");
1734	AssertRCReturn(rc, rc);
1735
1736	rc = RTSemEventCreate(&pThis->EventRecv);
1737	AssertRCReturn(rc, rc);
1738
1739	rc = RTSemEventCreate(&pThis->EventUrgRecv);
1740	AssertRCReturn(rc, rc);
1741
1742	rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pUrgRecvThread, pThis, drvNATUrgRecv,
1743	drvNATUrgRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATURGRX");
1744	AssertRCReturn(rc, rc);
1745
1746	rc = RTReqQueueCreate(&pThis->hHostResQueue);
1747	AssertRCReturn(rc, rc);
1748
1749	rc = PDMDrvHlpThreadCreate(pThis->pDrvIns, &pThis->pHostResThread,
1750	pThis, drvNATHostResThread, drvNATHostResWakeup,
1751	64 * _1K, RTTHREADTYPE_IO, "HOSTRES");
1752	AssertRCReturn(rc, rc);
1753
1754	rc = RTCritSectInit(&pThis->DevAccessLock);
1755	AssertRCReturn(rc, rc);
1756
1757	rc = RTCritSectInit(&pThis->XmitLock);
1758	AssertRCReturn(rc, rc);
1759
1760	char szTmp[128];
1761	RTStrPrintf(szTmp, sizeof(szTmp), "nat%d", pDrvIns->iInstance);
1762	PDMDrvHlpDBGFInfoRegister(pDrvIns, szTmp, "NAT info.", drvNATInfo);
1763
1764	#ifndef RT_OS_WINDOWS
1765	/*
1766	* Create the control pipe.
1767	*/
1768	rc = RTPipeCreate(&pThis->hPipeRead, &pThis->hPipeWrite, 0 /fFlags/);
1769	AssertRCReturn(rc, rc);
1770	#else
1771	pThis->hWakeupEvent = CreateEvent(NULL, FALSE, FALSE, NULL); /* auto-reset event */
1772	slirp_register_external_event(pThis->pNATState, pThis->hWakeupEvent,
1773	VBOX_WAKEUP_EVENT_INDEX);
1774	#endif
1775
1776	rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pSlirpThread, pThis, drvNATAsyncIoThread,
1777	drvNATAsyncIoWakeup, 128 * _1K, RTTHREADTYPE_IO, "NAT");
1778	AssertRCReturn(rc, rc);
1779
1780	pThis->enmLinkState = pThis->enmLinkStateWant = PDMNETWORKLINKSTATE_UP;
1781
1782	#ifdef RT_OS_DARWIN
1783	/* Set up a watcher which notifies us everytime the DNS server changes. */
1784	int rc2 = VINF_SUCCESS;
1785	SCDynamicStoreContext SCDynStorCtx;
1786
1787	SCDynStorCtx.version = 0;
1788	SCDynStorCtx.info = pThis;
1789	SCDynStorCtx.retain = NULL;
1790	SCDynStorCtx.release = NULL;
1791	SCDynStorCtx.copyDescription = NULL;
1792
1793	SCDynamicStoreRef hDynStor = SCDynamicStoreCreate(NULL, CFSTR("org.virtualbox.drvnat"), drvNatDnsChanged, &SCDynStorCtx);
1794	if (hDynStor)
1795	{
1796	CFRunLoopSourceRef hRunLoopSrc = SCDynamicStoreCreateRunLoopSource(NULL, hDynStor, 0);
1797	if (hRunLoopSrc)
1798	{
1799	CFStringRef aWatchKeys[] =
1800	{
1801	CFSTR("State:/Network/Global/DNS")
1802	};
1803	CFArrayRef hArray = CFArrayCreate(NULL, (const void **)aWatchKeys, 1, &kCFTypeArrayCallBacks);
1804
1805	if (hArray)
1806	{
1807	if (SCDynamicStoreSetNotificationKeys(hDynStor, hArray, NULL))
1808	{
1809	CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1810	CFRetain(hRunLoopMain);
1811	CFRunLoopAddSource(hRunLoopMain, hRunLoopSrc, kCFRunLoopCommonModes);
1812	CFRelease(hRunLoopMain);
1813	pThis->hRunLoopSrcDnsWatcher = hRunLoopSrc;
1814	}
1815	else
1816	rc2 = VERR_NO_MEMORY;
1817
1818	CFRelease(hArray);
1819	}
1820	else
1821	rc2 = VERR_NO_MEMORY;
1822
1823	if (RT_FAILURE(rc2)) /* Keep the runloop source referenced for destruction. */
1824	CFRelease(hRunLoopSrc);
1825	}
1826	CFRelease(hDynStor);
1827	}
1828	else
1829	rc2 = VERR_NO_MEMORY;
1830
1831	if (RT_FAILURE(rc2))
1832	LogRel(("NAT#%d: Failed to install DNS change notifier. The guest might loose DNS access when switching networks on the host\n",
1833	pDrvIns->iInstance));
1834	#endif
1835	return rc;
1836	}
1837
1838	/* failure path */
1839	slirp_term(pThis->pNATState);
1840	pThis->pNATState = NULL;
1841	}
1842	else
1843	{
1844	PDMDRV_SET_ERROR(pDrvIns, rc, N_("Unknown error during NAT networking setup: "));
1845	AssertMsgFailed(("Add error message for rc=%d (%Rrc)\n", rc, rc));
1846	}
1847
1848	return rc;
1849	}
1850
1851
1852	/**
1853	* NAT network transport driver registration record.
1854	*/
1855	const PDMDRVREG g_DrvNAT =
1856	{
1857	/* u32Version */
1858	PDM_DRVREG_VERSION,
1859	/* szName */
1860	"NAT",
1861	/* szRCMod */
1862	"",
1863	/* szR0Mod */
1864	"",
1865	/* pszDescription */
1866	"NAT Network Transport Driver",
1867	/* fFlags */
1868	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1869	/* fClass. */
1870	PDM_DRVREG_CLASS_NETWORK,
1871	/* cMaxInstances */
1872	~0U,
1873	/* cbInstance */
1874	sizeof(DRVNAT),
1875	/* pfnConstruct */
1876	drvNATConstruct,
1877	/* pfnDestruct */
1878	drvNATDestruct,
1879	/* pfnRelocate */
1880	NULL,
1881	/* pfnIOCtl */
1882	NULL,
1883	/* pfnPowerOn */
1884	drvNATPowerOn,
1885	/* pfnReset */
1886	NULL,
1887	/* pfnSuspend */
1888	NULL,
1889	/* pfnResume */
1890	drvNATResume,
1891	/* pfnAttach */
1892	NULL,
1893	/* pfnDetach */
1894	NULL,
1895	/* pfnPowerOff */
1896	NULL,
1897	/* pfnSoftReset */
1898	NULL,
1899	/* u32EndVersion */
1900	PDM_DRVREG_VERSION
1901	};
1902

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source: vbox/trunk/src/VBox/Devices/Network/DrvNAT.cpp@ 91881

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