DrvNAT.cpp@ 105381

Last change on this file since 105381 was 105353, checked in by vboxsync, 4 months ago
iprt/req.h,*: Adjustments of the RTReqQueue API to fit darwin/arm64 restrictions. bugref:10725
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1	/* $Id: DrvNAT.cpp 105353 2024-07-16 11:47:19Z vboxsync $ */
2	/** @file
3	* DrvNAT - NAT network transport driver.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_DRV_NAT
33	#define __STDC_LIMIT_MACROS
34	#define __STDC_CONSTANT_MACROS
35	#include "slirp/libslirp.h"
36	extern "C" {
37	#include "slirp/slirp_dns.h"
38	}
39	#include "slirp/ctl.h"
40
41	#include <VBox/vmm/dbgf.h>
42	#include <VBox/vmm/pdmdrv.h>
43	#include <VBox/vmm/pdmnetifs.h>
44	#include <VBox/vmm/pdmnetinline.h>
45
46	#include <iprt/assert.h>
47	#include <iprt/critsect.h>
48	#include <iprt/cidr.h>
49	#include <iprt/file.h>
50	#include <iprt/mem.h>
51	#include <iprt/pipe.h>
52	#include <iprt/string.h>
53	#include <iprt/stream.h>
54	#include <iprt/uuid.h>
55
56	#include "VBoxDD.h"
57
58	#ifndef RT_OS_WINDOWS
59	# include <unistd.h>
60	# include <fcntl.h>
61	# include <poll.h>
62	# include <errno.h>
63	#endif
64	#ifdef RT_OS_FREEBSD
65	# include <netinet/in.h>
66	#endif
67	#include <iprt/semaphore.h>
68	#include <iprt/req.h>
69	#ifdef RT_OS_DARWIN
70	# include <SystemConfiguration/SystemConfiguration.h>
71	# include <CoreFoundation/CoreFoundation.h>
72	#endif
73
74	#define COUNTERS_INIT
75	#include "counters.h"
76
77
78	/*********************************************************************************************************************************
79	* Defined Constants And Macros *
80	*********************************************************************************************************************************/
81
82	#define DRVNAT_MAXFRAMESIZE (16 * 1024)
83
84	/**
85	* @todo: This is a bad hack to prevent freezing the guest during high network
86	* activity. Windows host only. This needs to be fixed properly.
87	*/
88	#define VBOX_NAT_DELAY_HACK
89
90	#define GET_EXTRADATA(pdrvins, node, name, rc, type, type_name, var) \
91	do { \
92	(rc) = (pdrvins)->pHlpR3->pfnCFGMQuery ## type((node), name, &(var)); \
93	if (RT_FAILURE((rc)) && (rc) != VERR_CFGM_VALUE_NOT_FOUND) \
94	return PDMDrvHlpVMSetError((pdrvins), (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \"" name "\" " #type_name " failed"), \
95	(pdrvins)->iInstance); \
96	} while (0)
97
98	#define GET_ED_STRICT(pdrvins, node, name, rc, type, type_name, var) \
99	do { \
100	(rc) = (pdrvins)->pHlpR3->pfnCFGMQuery ## type((node), name, &(var)); \
101	if (RT_FAILURE((rc))) \
102	return PDMDrvHlpVMSetError((pdrvins), (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \"" name "\" " #type_name " failed"), \
103	(pdrvins)->iInstance); \
104	} while (0)
105
106	#define GET_EXTRADATA_N(pdrvins, node, name, rc, type, type_name, var, var_size) \
107	do { \
108	(rc) = (pdrvins)->pHlpR3->pfnCFGMQuery ## type((node), name, &(var), var_size); \
109	if (RT_FAILURE((rc)) && (rc) != VERR_CFGM_VALUE_NOT_FOUND) \
110	return PDMDrvHlpVMSetError((pdrvins), (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \"" name "\" " #type_name " failed"), \
111	(pdrvins)->iInstance); \
112	} while (0)
113
114	#define GET_BOOL(rc, pdrvins, node, name, var) \
115	GET_EXTRADATA(pdrvins, node, name, (rc), Bool, bolean, (var))
116	#define GET_STRING(rc, pdrvins, node, name, var, var_size) \
117	GET_EXTRADATA_N(pdrvins, node, name, (rc), String, string, (var), (var_size))
118	#define GET_STRING_ALLOC(rc, pdrvins, node, name, var) \
119	GET_EXTRADATA(pdrvins, node, name, (rc), StringAlloc, string, (var))
120	#define GET_S32(rc, pdrvins, node, name, var) \
121	GET_EXTRADATA(pdrvins, node, name, (rc), S32, int, (var))
122	#define GET_S32_STRICT(rc, pdrvins, node, name, var) \
123	GET_ED_STRICT(pdrvins, node, name, (rc), S32, int, (var))
124
125
126
127	#define DO_GET_IP(rc, node, instance, status, x) \
128	do { \
129	char sz##x[32]; \
130	GET_STRING((rc), (node), (instance), #x, sz ## x[0], sizeof(sz ## x)); \
131	if (rc != VERR_CFGM_VALUE_NOT_FOUND) \
132	(status) = inet_aton(sz ## x, &x); \
133	} while (0)
134
135	#define GETIP_DEF(rc, node, instance, x, def) \
136	do \
137	{ \
138	int status = 0; \
139	DO_GET_IP((rc), (node), (instance), status, x); \
140	if (status == 0 \|\| rc == VERR_CFGM_VALUE_NOT_FOUND) \
141	x.s_addr = def; \
142	} while (0)
143
144
145	/*********************************************************************************************************************************
146	* Structures and Typedefs *
147	*********************************************************************************************************************************/
148	/**
149	* NAT network transport driver instance data.
150	*
151	* @implements PDMINETWORKUP
152	*/
153	typedef struct DRVNAT
154	{
155	/** The network interface. */
156	PDMINETWORKUP INetworkUp;
157	/** The network NAT Engine configureation. */
158	PDMINETWORKNATCONFIG INetworkNATCfg;
159	/** The port we're attached to. */
160	PPDMINETWORKDOWN pIAboveNet;
161	/** The network config of the port we're attached to. */
162	PPDMINETWORKCONFIG pIAboveConfig;
163	/** Pointer to the driver instance. */
164	PPDMDRVINS pDrvIns;
165	/** Link state */
166	PDMNETWORKLINKSTATE enmLinkState;
167	/** NAT state for this instance. */
168	PNATState pNATState;
169	/** TFTP directory prefix. */
170	char *pszTFTPPrefix;
171	/** Boot file name to provide in the DHCP server response. */
172	char *pszBootFile;
173	/** tftp server name to provide in the DHCP server response. */
174	char *pszNextServer;
175	/** Polling thread. */
176	PPDMTHREAD pSlirpThread;
177	/** Queue for NAT-thread-external events. */
178	RTREQQUEUE hSlirpReqQueue;
179	/** The guest IP for port-forwarding. */
180	uint32_t GuestIP;
181	/** Link state set when the VM is suspended. */
182	PDMNETWORKLINKSTATE enmLinkStateWant;
183
184	#ifndef RT_OS_WINDOWS
185	/** The write end of the control pipe. */
186	RTPIPE hPipeWrite;
187	/** The read end of the control pipe. */
188	RTPIPE hPipeRead;
189	# if HC_ARCH_BITS == 32
190	uint32_t u32Padding;
191	# endif
192	#else
193	/** for external notification */
194	HANDLE hWakeupEvent;
195	#endif
196
197	#define DRV_PROFILE_COUNTER(name, dsc) STAMPROFILE Stat ## name
198	#define DRV_COUNTING_COUNTER(name, dsc) STAMCOUNTER Stat ## name
199	#include "counters.h"
200	/** thread delivering packets for receiving by the guest */
201	PPDMTHREAD pRecvThread;
202	/** thread delivering urg packets for receiving by the guest */
203	PPDMTHREAD pUrgRecvThread;
204	/** event to wakeup the guest receive thread */
205	RTSEMEVENT EventRecv;
206	/** event to wakeup the guest urgent receive thread */
207	RTSEMEVENT EventUrgRecv;
208	/** Receive Req queue (deliver packets to the guest) */
209	RTREQQUEUE hRecvReqQueue;
210	/** Receive Urgent Req queue (deliver packets to the guest). */
211	RTREQQUEUE hUrgRecvReqQueue;
212
213	/** makes access to device func RecvAvail and Recv atomical. */
214	RTCRITSECT DevAccessLock;
215	/** Number of in-flight urgent packets. */
216	volatile uint32_t cUrgPkts;
217	/** Number of in-flight regular packets. */
218	volatile uint32_t cPkts;
219
220	/** Transmit lock taken by BeginXmit and released by EndXmit. */
221	RTCRITSECT XmitLock;
222
223	/** Request queue for the async host resolver. */
224	RTREQQUEUE hHostResQueue;
225	/** Async host resolver thread. */
226	PPDMTHREAD pHostResThread;
227
228	#ifdef RT_OS_DARWIN
229	/* Handle of the DNS watcher runloop source. */
230	CFRunLoopSourceRef hRunLoopSrcDnsWatcher;
231	#endif
232	} DRVNAT;
233	AssertCompileMemberAlignment(DRVNAT, StatNATRecvWakeups, 8);
234	/** Pointer to the NAT driver instance data. */
235	typedef DRVNAT *PDRVNAT;
236
237
238	/*********************************************************************************************************************************
239	* Internal Functions *
240	*********************************************************************************************************************************/
241	static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho);
242	DECLINLINE(void) drvNATUpdateDNS(PDRVNAT pThis, bool fFlapLink);
243	static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis);
244
245
246	/**
247	* @callback_method_impl{FNPDMTHREADDRV}
248	*/
249	static DECLCALLBACK(int) drvNATRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
250	{
251	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
252
253	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
254	return VINF_SUCCESS;
255
256	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
257	{
258	RTReqQueueProcess(pThis->hRecvReqQueue, 0);
259	if (ASMAtomicReadU32(&pThis->cPkts) == 0)
260	RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
261	}
262	return VINF_SUCCESS;
263	}
264
265
266	/**
267	* @callback_method_impl{FNPDMTHREADWAKEUPDRV}
268	*/
269	static DECLCALLBACK(int) drvNATRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
270	{
271	RT_NOREF(pThread);
272	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
273
274	STAM_COUNTER_INC(&pThis->StatNATRecvWakeups);
275	return RTSemEventSignal(pThis->EventRecv);
276	}
277
278
279	/**
280	* @callback_method_impl{FNPDMTHREADDRV}
281	*/
282	static DECLCALLBACK(int) drvNATUrgRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
283	{
284	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
285
286	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
287	return VINF_SUCCESS;
288
289	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
290	{
291	RTReqQueueProcess(pThis->hUrgRecvReqQueue, 0);
292	if (ASMAtomicReadU32(&pThis->cUrgPkts) == 0)
293	{
294	int rc = RTSemEventWait(pThis->EventUrgRecv, RT_INDEFINITE_WAIT);
295	AssertRC(rc);
296	}
297	}
298	return VINF_SUCCESS;
299	}
300
301
302	/**
303	* @callback_method_impl{FNPDMTHREADWAKEUPDRV}
304	*/
305	static DECLCALLBACK(int) drvNATUrgRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
306	{
307	RT_NOREF(pThread);
308	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
309	int rc = RTSemEventSignal(pThis->EventUrgRecv);
310	AssertRC(rc);
311
312	return VINF_SUCCESS;
313	}
314
315
316	static DECLCALLBACK(void) drvNATUrgRecvWorker(PDRVNAT pThis, uint8_t pu8Buf, int cb, struct mbuf m)
317	{
318	int rc = RTCritSectEnter(&pThis->DevAccessLock);
319	AssertRC(rc);
320	rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
321	if (RT_SUCCESS(rc))
322	{
323	rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
324	AssertRC(rc);
325	}
326	else if ( rc != VERR_TIMEOUT
327	&& rc != VERR_INTERRUPTED)
328	{
329	AssertRC(rc);
330	}
331
332	rc = RTCritSectLeave(&pThis->DevAccessLock);
333	AssertRC(rc);
334
335	slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
336	if (ASMAtomicDecU32(&pThis->cUrgPkts) == 0)
337	{
338	drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
339	drvNATNotifyNATThread(pThis, "drvNATUrgRecvWorker");
340	}
341	}
342
343
344	static DECLCALLBACK(void) drvNATRecvWorker(PDRVNAT pThis, uint8_t pu8Buf, int cb, struct mbuf m)
345	{
346	int rc;
347	STAM_PROFILE_START(&pThis->StatNATRecv, a);
348
349
350	while (ASMAtomicReadU32(&pThis->cUrgPkts) != 0)
351	{
352	rc = RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
353	if ( RT_FAILURE(rc)
354	&& ( rc == VERR_TIMEOUT
355	\|\| rc == VERR_INTERRUPTED))
356	goto done_unlocked;
357	}
358
359	rc = RTCritSectEnter(&pThis->DevAccessLock);
360	AssertRC(rc);
361
362	STAM_PROFILE_START(&pThis->StatNATRecvWait, b);
363	rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
364	STAM_PROFILE_STOP(&pThis->StatNATRecvWait, b);
365
366	if (RT_SUCCESS(rc))
367	{
368	rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
369	AssertRC(rc);
370	}
371	else if ( rc != VERR_TIMEOUT
372	&& rc != VERR_INTERRUPTED)
373	{
374	AssertRC(rc);
375	}
376
377	rc = RTCritSectLeave(&pThis->DevAccessLock);
378	AssertRC(rc);
379
380	done_unlocked:
381	slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
382	ASMAtomicDecU32(&pThis->cPkts);
383
384	drvNATNotifyNATThread(pThis, "drvNATRecvWorker");
385
386	STAM_PROFILE_STOP(&pThis->StatNATRecv, a);
387	}
388
389	/**
390	* Frees a S/G buffer allocated by drvNATNetworkUp_AllocBuf.
391	*
392	* @param pThis Pointer to the NAT instance.
393	* @param pSgBuf The S/G buffer to free.
394	*/
395	static void drvNATFreeSgBuf(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
396	{
397	Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_MAGIC_MASK) == PDMSCATTERGATHER_FLAGS_MAGIC);
398	pSgBuf->fFlags = 0;
399	if (pSgBuf->pvAllocator)
400	{
401	Assert(!pSgBuf->pvUser);
402	slirp_ext_m_free(pThis->pNATState, (struct mbuf *)pSgBuf->pvAllocator, NULL);
403	pSgBuf->pvAllocator = NULL;
404	}
405	else if (pSgBuf->pvUser)
406	{
407	RTMemFree(pSgBuf->aSegs[0].pvSeg);
408	pSgBuf->aSegs[0].pvSeg = NULL;
409	RTMemFree(pSgBuf->pvUser);
410	pSgBuf->pvUser = NULL;
411	}
412	RTMemFree(pSgBuf);
413	}
414
415	/**
416	* Worker function for drvNATSend().
417	*
418	* @param pThis Pointer to the NAT instance.
419	* @param pSgBuf The scatter/gather buffer.
420	* @thread NAT
421	*/
422	static DECLCALLBACK(void) drvNATSendWorker(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
423	{
424	#if 0 /* Assertion happens often to me after resuming a VM -- no time to investigate this now. */
425	Assert(pThis->enmLinkState == PDMNETWORKLINKSTATE_UP);
426	#endif
427	if (pThis->enmLinkState == PDMNETWORKLINKSTATE_UP)
428	{
429	struct mbuf m = (struct mbuf )pSgBuf->pvAllocator;
430	if (m)
431	{
432	/*
433	* A normal frame.
434	*/
435	pSgBuf->pvAllocator = NULL;
436	slirp_input(pThis->pNATState, m, pSgBuf->cbUsed);
437	}
438	else
439	{
440	/*
441	* GSO frame, need to segment it.
442	*/
443	/** @todo Make the NAT engine grok large frames? Could be more efficient... */
444	#if 0 /* this is for testing PDMNetGsoCarveSegmentQD. */
445	uint8_t abHdrScratch[256];
446	#endif
447	uint8_t const pbFrame = (uint8_t const )pSgBuf->aSegs[0].pvSeg;
448	PCPDMNETWORKGSO pGso = (PCPDMNETWORKGSO)pSgBuf->pvUser;
449	/* Do not attempt to segment frames with invalid GSO parameters. */
450	if (PDMNetGsoIsValid(pGso, sizeof(*pGso), pSgBuf->cbUsed))
451	{
452	uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, pSgBuf->cbUsed); Assert(cSegs > 1);
453	for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
454	{
455	size_t cbSeg;
456	void *pvSeg;
457	m = slirp_ext_m_get(pThis->pNATState, pGso->cbHdrsTotal + pGso->cbMaxSeg, &pvSeg, &cbSeg);
458	if (!m)
459	break;
460
461	#if 1
462	uint32_t cbPayload, cbHdrs;
463	uint32_t offPayload = PDMNetGsoCarveSegment(pGso, pbFrame, pSgBuf->cbUsed,
464	iSeg, cSegs, (uint8_t *)pvSeg, &cbHdrs, &cbPayload);
465	memcpy((uint8_t *)pvSeg + cbHdrs, pbFrame + offPayload, cbPayload);
466
467	slirp_input(pThis->pNATState, m, cbPayload + cbHdrs);
468	#else
469	uint32_t cbSegFrame;
470	void pvSegFrame = PDMNetGsoCarveSegmentQD(pGso, (uint8_t )pbFrame, pSgBuf->cbUsed, abHdrScratch,
471	iSeg, cSegs, &cbSegFrame);
472	memcpy((uint8_t *)pvSeg, pvSegFrame, cbSegFrame);
473
474	slirp_input(pThis->pNATState, m, cbSegFrame);
475	#endif
476	}
477	}
478	}
479	}
480	drvNATFreeSgBuf(pThis, pSgBuf);
481
482	/** @todo Implement the VERR_TRY_AGAIN drvNATNetworkUp_AllocBuf semantics. */
483	}
484
485	/**
486	* @interface_method_impl{PDMINETWORKUP,pfnBeginXmit}
487	*/
488	static DECLCALLBACK(int) drvNATNetworkUp_BeginXmit(PPDMINETWORKUP pInterface, bool fOnWorkerThread)
489	{
490	RT_NOREF(fOnWorkerThread);
491	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
492	int rc = RTCritSectTryEnter(&pThis->XmitLock);
493	if (RT_FAILURE(rc))
494	{
495	/** @todo Kick the worker thread when we have one... */
496	rc = VERR_TRY_AGAIN;
497	}
498	return rc;
499	}
500
501	/**
502	* @interface_method_impl{PDMINETWORKUP,pfnAllocBuf}
503	*/
504	static DECLCALLBACK(int) drvNATNetworkUp_AllocBuf(PPDMINETWORKUP pInterface, size_t cbMin,
505	PCPDMNETWORKGSO pGso, PPPDMSCATTERGATHER ppSgBuf)
506	{
507	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
508	Assert(RTCritSectIsOwner(&pThis->XmitLock));
509
510	/*
511	* Drop the incoming frame if the NAT thread isn't running.
512	*/
513	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
514	{
515	Log(("drvNATNetowrkUp_AllocBuf: returns VERR_NET_NO_NETWORK\n"));
516	return VERR_NET_NO_NETWORK;
517	}
518
519	/*
520	* Allocate a scatter/gather buffer and an mbuf.
521	*/
522	PPDMSCATTERGATHER pSgBuf = (PPDMSCATTERGATHER)RTMemAlloc(sizeof(*pSgBuf));
523	if (!pSgBuf)
524	return VERR_NO_MEMORY;
525	if (!pGso)
526	{
527	/*
528	* Drop the frame if it is too big.
529	*/
530	if (cbMin >= DRVNAT_MAXFRAMESIZE)
531	{
532	Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
533	cbMin));
534	RTMemFree(pSgBuf);
535	return VERR_INVALID_PARAMETER;
536	}
537
538	pSgBuf->pvUser = NULL;
539	pSgBuf->pvAllocator = slirp_ext_m_get(pThis->pNATState, cbMin,
540	&pSgBuf->aSegs[0].pvSeg, &pSgBuf->aSegs[0].cbSeg);
541	if (!pSgBuf->pvAllocator)
542	{
543	RTMemFree(pSgBuf);
544	return VERR_TRY_AGAIN;
545	}
546	}
547	else
548	{
549	/*
550	* Drop the frame if its segment is too big.
551	*/
552	if (pGso->cbHdrsTotal + pGso->cbMaxSeg >= DRVNAT_MAXFRAMESIZE)
553	{
554	Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
555	pGso->cbHdrsTotal + pGso->cbMaxSeg));
556	RTMemFree(pSgBuf);
557	return VERR_INVALID_PARAMETER;
558	}
559
560	pSgBuf->pvUser = RTMemDup(pGso, sizeof(*pGso));
561	pSgBuf->pvAllocator = NULL;
562	pSgBuf->aSegs[0].cbSeg = RT_ALIGN_Z(cbMin, 16);
563	pSgBuf->aSegs[0].pvSeg = RTMemAlloc(pSgBuf->aSegs[0].cbSeg);
564	if (!pSgBuf->pvUser \|\| !pSgBuf->aSegs[0].pvSeg)
565	{
566	RTMemFree(pSgBuf->aSegs[0].pvSeg);
567	RTMemFree(pSgBuf->pvUser);
568	RTMemFree(pSgBuf);
569	return VERR_TRY_AGAIN;
570	}
571	}
572
573	/*
574	* Initialize the S/G buffer and return.
575	*/
576	pSgBuf->fFlags = PDMSCATTERGATHER_FLAGS_MAGIC \| PDMSCATTERGATHER_FLAGS_OWNER_1;
577	pSgBuf->cbUsed = 0;
578	pSgBuf->cbAvailable = pSgBuf->aSegs[0].cbSeg;
579	pSgBuf->cSegs = 1;
580
581	#if 0 /* poison */
582	memset(pSgBuf->aSegs[0].pvSeg, 'F', pSgBuf->aSegs[0].cbSeg);
583	#endif
584	*ppSgBuf = pSgBuf;
585	return VINF_SUCCESS;
586	}
587
588	/**
589	* @interface_method_impl{PDMINETWORKUP,pfnFreeBuf}
590	*/
591	static DECLCALLBACK(int) drvNATNetworkUp_FreeBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf)
592	{
593	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
594	Assert(RTCritSectIsOwner(&pThis->XmitLock));
595	drvNATFreeSgBuf(pThis, pSgBuf);
596	return VINF_SUCCESS;
597	}
598
599	/**
600	* @interface_method_impl{PDMINETWORKUP,pfnSendBuf}
601	*/
602	static DECLCALLBACK(int) drvNATNetworkUp_SendBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf, bool fOnWorkerThread)
603	{
604	RT_NOREF(fOnWorkerThread);
605	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
606	Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_OWNER_MASK) == PDMSCATTERGATHER_FLAGS_OWNER_1);
607	Assert(RTCritSectIsOwner(&pThis->XmitLock));
608
609	int rc;
610	if (pThis->pSlirpThread->enmState == PDMTHREADSTATE_RUNNING)
611	{
612	rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, NULL /ppReq/, 0 /cMillies/, RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
613	(PFNRT)drvNATSendWorker, 2, pThis, pSgBuf);
614	if (RT_SUCCESS(rc))
615	{
616	drvNATNotifyNATThread(pThis, "drvNATNetworkUp_SendBuf");
617	return VINF_SUCCESS;
618	}
619
620	rc = VERR_NET_NO_BUFFER_SPACE;
621	}
622	else
623	rc = VERR_NET_DOWN;
624	drvNATFreeSgBuf(pThis, pSgBuf);
625	return rc;
626	}
627
628	/**
629	* @interface_method_impl{PDMINETWORKUP,pfnEndXmit}
630	*/
631	static DECLCALLBACK(void) drvNATNetworkUp_EndXmit(PPDMINETWORKUP pInterface)
632	{
633	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
634	RTCritSectLeave(&pThis->XmitLock);
635	}
636
637	/**
638	* Get the NAT thread out of poll/WSAWaitForMultipleEvents
639	*/
640	static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho)
641	{
642	RT_NOREF(pszWho);
643	int rc;
644	#ifndef RT_OS_WINDOWS
645	/* kick poll() */
646	size_t cbIgnored;
647	rc = RTPipeWrite(pThis->hPipeWrite, "", 1, &cbIgnored);
648	#else
649	/* kick WSAWaitForMultipleEvents */
650	rc = WSASetEvent(pThis->hWakeupEvent);
651	#endif
652	AssertRC(rc);
653	}
654
655	/**
656	* @interface_method_impl{PDMINETWORKUP,pfnSetPromiscuousMode}
657	*/
658	static DECLCALLBACK(void) drvNATNetworkUp_SetPromiscuousMode(PPDMINETWORKUP pInterface, bool fPromiscuous)
659	{
660	RT_NOREF(pInterface, fPromiscuous);
661	LogFlow(("drvNATNetworkUp_SetPromiscuousMode: fPromiscuous=%d\n", fPromiscuous));
662	/* nothing to do */
663	}
664
665	/**
666	* Worker function for drvNATNetworkUp_NotifyLinkChanged().
667	* @thread "NAT" thread.
668	*/
669	static DECLCALLBACK(void) drvNATNotifyLinkChangedWorker(PDRVNAT pThis, PDMNETWORKLINKSTATE enmLinkState)
670	{
671	pThis->enmLinkState = pThis->enmLinkStateWant = enmLinkState;
672	switch (enmLinkState)
673	{
674	case PDMNETWORKLINKSTATE_UP:
675	LogRel(("NAT: Link up\n"));
676	slirp_link_up(pThis->pNATState);
677	break;
678
679	case PDMNETWORKLINKSTATE_DOWN:
680	case PDMNETWORKLINKSTATE_DOWN_RESUME:
681	LogRel(("NAT: Link down\n"));
682	slirp_link_down(pThis->pNATState);
683	break;
684
685	default:
686	AssertMsgFailed(("drvNATNetworkUp_NotifyLinkChanged: unexpected link state %d\n", enmLinkState));
687	}
688	}
689
690	/**
691	* Notification on link status changes.
692	*
693	* @param pInterface Pointer to the interface structure containing the called function pointer.
694	* @param enmLinkState The new link state.
695	* @thread EMT
696	*/
697	static DECLCALLBACK(void) drvNATNetworkUp_NotifyLinkChanged(PPDMINETWORKUP pInterface, PDMNETWORKLINKSTATE enmLinkState)
698	{
699	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
700
701	LogFlow(("drvNATNetworkUp_NotifyLinkChanged: enmLinkState=%d\n", enmLinkState));
702
703	/* Don't queue new requests if the NAT thread is not running (e.g. paused,
704	* stopping), otherwise we would deadlock. Memorize the change. */
705	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
706	{
707	pThis->enmLinkStateWant = enmLinkState;
708	return;
709	}
710
711	PRTREQ pReq;
712	int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /cMillies/, RTREQFLAGS_VOID,
713	(PFNRT)drvNATNotifyLinkChangedWorker, 2, pThis, enmLinkState);
714	if (rc == VERR_TIMEOUT)
715	{
716	drvNATNotifyNATThread(pThis, "drvNATNetworkUp_NotifyLinkChanged");
717	rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
718	AssertRC(rc);
719	}
720	else
721	AssertRC(rc);
722	RTReqRelease(pReq);
723	}
724
725	static DECLCALLBACK(void) drvNATNotifyApplyPortForwardCommand(PDRVNAT pThis, bool fRemove,
726	bool fUdp, const char *pHostIp,
727	uint16_t u16HostPort, const char *pGuestIp, uint16_t u16GuestPort)
728	{
729	struct in_addr guestIp, hostIp;
730
731	if ( pHostIp == NULL
732	\|\| inet_aton(pHostIp, &hostIp) == 0)
733	hostIp.s_addr = INADDR_ANY;
734
735	if ( pGuestIp == NULL
736	\|\| inet_aton(pGuestIp, &guestIp) == 0)
737	guestIp.s_addr = pThis->GuestIP;
738
739	if (fRemove)
740	slirp_remove_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
741	else
742	slirp_add_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
743	}
744
745	static DECLCALLBACK(int) drvNATNetworkNatConfigRedirect(PPDMINETWORKNATCONFIG pInterface, bool fRemove,
746	bool fUdp, const char *pHostIp, uint16_t u16HostPort,
747	const char *pGuestIp, uint16_t u16GuestPort)
748	{
749	LogFlowFunc(("fRemove=%d, fUdp=%d, pHostIp=%s, u16HostPort=%u, pGuestIp=%s, u16GuestPort=%u\n",
750	RT_BOOL(fRemove), RT_BOOL(fUdp), pHostIp, u16HostPort, pGuestIp, u16GuestPort));
751	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
752	/* Execute the command directly if the VM is not running. */
753	int rc;
754	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
755	{
756	drvNATNotifyApplyPortForwardCommand(pThis, fRemove, fUdp, pHostIp,
757	u16HostPort, pGuestIp,u16GuestPort);
758	rc = VINF_SUCCESS;
759	}
760	else
761	{
762	PRTREQ pReq;
763	rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /cMillies/, RTREQFLAGS_VOID,
764	(PFNRT)drvNATNotifyApplyPortForwardCommand, 7, pThis, fRemove,
765	fUdp, pHostIp, u16HostPort, pGuestIp, u16GuestPort);
766	if (rc == VERR_TIMEOUT)
767	{
768	drvNATNotifyNATThread(pThis, "drvNATNetworkNatConfigRedirect");
769	rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
770	AssertRC(rc);
771	}
772	else
773	AssertRC(rc);
774
775	RTReqRelease(pReq);
776	}
777	return rc;
778	}
779
780	/**
781	* NAT thread handling the slirp stuff.
782	*
783	* The slirp implementation is single-threaded so we execute this enginre in a
784	* dedicated thread. We take care that this thread does not become the
785	* bottleneck: If the guest wants to send, a request is enqueued into the
786	* hSlirpReqQueue and handled asynchronously by this thread. If this thread
787	* wants to deliver packets to the guest, it enqueues a request into
788	* hRecvReqQueue which is later handled by the Recv thread.
789	*/
790	static DECLCALLBACK(int) drvNATAsyncIoThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
791	{
792	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
793	int nFDs = -1;
794	#ifdef RT_OS_WINDOWS
795	HANDLE *phEvents = slirp_get_events(pThis->pNATState);
796	unsigned int cBreak = 0;
797	#else /* RT_OS_WINDOWS */
798	unsigned int cPollNegRet = 0;
799	#endif /* !RT_OS_WINDOWS */
800
801	LogFlow(("drvNATAsyncIoThread: pThis=%p\n", pThis));
802
803	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
804	return VINF_SUCCESS;
805
806	if (pThis->enmLinkStateWant != pThis->enmLinkState)
807	drvNATNotifyLinkChangedWorker(pThis, pThis->enmLinkStateWant);
808
809	/*
810	* Polling loop.
811	*/
812	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
813	{
814	/*
815	* To prevent concurrent execution of sending/receiving threads
816	*/
817	#ifndef RT_OS_WINDOWS
818	nFDs = slirp_get_nsock(pThis->pNATState);
819	/* allocation for all sockets + Management pipe */
820	struct pollfd polls = (struct pollfd )RTMemAlloc((1 + nFDs) * sizeof(struct pollfd) + sizeof(uint32_t));
821	if (polls == NULL)
822	return VERR_NO_MEMORY;
823
824	/* don't pass the management pipe */
825	slirp_select_fill(pThis->pNATState, &nFDs, &polls[1]);
826
827	polls[0].fd = RTPipeToNative(pThis->hPipeRead);
828	/* POLLRDBAND usually doesn't used on Linux but seems used on Solaris */
829	polls[0].events = POLLRDNORM \| POLLPRI \| POLLRDBAND;
830	polls[0].revents = 0;
831
832	int cChangedFDs = poll(polls, nFDs + 1, slirp_get_timeout_ms(pThis->pNATState));
833	if (cChangedFDs < 0)
834	{
835	if (errno == EINTR)
836	{
837	Log2(("NAT: signal was caught while sleep on poll\n"));
838	/* No error, just process all outstanding requests but don't wait */
839	cChangedFDs = 0;
840	}
841	else if (cPollNegRet++ > 128)
842	{
843	LogRel(("NAT: Poll returns (%s) suppressed %d\n", strerror(errno), cPollNegRet));
844	cPollNegRet = 0;
845	}
846	}
847
848	if (cChangedFDs >= 0)
849	{
850	slirp_select_poll(pThis->pNATState, &polls[1], nFDs);
851	if (polls[0].revents & (POLLRDNORM\|POLLPRI\|POLLRDBAND))
852	{
853	/* drain the pipe
854	*
855	* Note! drvNATSend decoupled so we don't know how many times
856	* device's thread sends before we've entered multiplex,
857	* so to avoid false alarm drain pipe here to the very end
858	*
859	* @todo: Probably we should counter drvNATSend to count how
860	* deep pipe has been filed before drain.
861	*
862	*/
863	/** @todo XXX: Make it reading exactly we need to drain the
864	* pipe.*/
865	char ch;
866	size_t cbRead;
867	RTPipeRead(pThis->hPipeRead, &ch, 1, &cbRead);
868	}
869	}
870	/* process _all_ outstanding requests but don't wait */
871	RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
872	RTMemFree(polls);
873
874	#else /* RT_OS_WINDOWS */
875	nFDs = -1;
876	slirp_select_fill(pThis->pNATState, &nFDs);
877	DWORD dwEvent = WSAWaitForMultipleEvents(nFDs, phEvents, FALSE,
878	slirp_get_timeout_ms(pThis->pNATState),
879	/* :fAlertable */ TRUE);
880	AssertCompile(WSA_WAIT_EVENT_0 == 0);
881	if ( (/dwEvent < WSA_WAIT_EVENT_0 \|\|/ dwEvent > WSA_WAIT_EVENT_0 + nFDs - 1)
882	&& dwEvent != WSA_WAIT_TIMEOUT && dwEvent != WSA_WAIT_IO_COMPLETION)
883	{
884	int error = WSAGetLastError();
885	LogRel(("NAT: WSAWaitForMultipleEvents returned %d (error %d)\n", dwEvent, error));
886	RTAssertPanic();
887	}
888
889	if (dwEvent == WSA_WAIT_TIMEOUT)
890	{
891	/* only check for slow/fast timers */
892	slirp_select_poll(pThis->pNATState, /* fTimeout=*/true);
893	continue;
894	}
895	/* poll the sockets in any case */
896	Log2(("%s: poll\n", __FUNCTION__));
897	slirp_select_poll(pThis->pNATState, /* fTimeout=*/false);
898	/* process _all_ outstanding requests but don't wait */
899	RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
900	# ifdef VBOX_NAT_DELAY_HACK
901	if (cBreak++ > 128)
902	{
903	cBreak = 0;
904	RTThreadSleep(2);
905	}
906	# endif
907	#endif /* RT_OS_WINDOWS */
908	}
909
910	return VINF_SUCCESS;
911	}
912
913
914	/**
915	* Unblock the send thread so it can respond to a state change.
916	*
917	* @returns VBox status code.
918	* @param pDevIns The pcnet device instance.
919	* @param pThread The send thread.
920	*/
921	static DECLCALLBACK(int) drvNATAsyncIoWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
922	{
923	RT_NOREF(pThread);
924	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
925
926	drvNATNotifyNATThread(pThis, "drvNATAsyncIoWakeup");
927	return VINF_SUCCESS;
928	}
929
930
931	static DECLCALLBACK(int) drvNATHostResThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
932	{
933	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
934
935	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
936	return VINF_SUCCESS;
937
938	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
939	{
940	RTReqQueueProcess(pThis->hHostResQueue, RT_INDEFINITE_WAIT);
941	}
942
943	return VINF_SUCCESS;
944	}
945
946
947	static DECLCALLBACK(int) drvNATReqQueueInterrupt()
948	{
949	/*
950	* RTReqQueueProcess loops until request returns a warning or info
951	* status code (other than VINF_SUCCESS).
952	*/
953	return VINF_INTERRUPTED;
954	}
955
956
957	static DECLCALLBACK(int) drvNATHostResWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
958	{
959	RT_NOREF(pThread);
960	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
961	Assert(pThis != NULL);
962
963	int rc;
964	rc = RTReqQueueCallEx(pThis->hHostResQueue, NULL /ppReq/, 0 /cMillies/, RTREQFLAGS_IPRT_STATUS \| RTREQFLAGS_NO_WAIT,
965	(PFNRT)drvNATReqQueueInterrupt, 0);
966	return rc;
967	}
968
969
970	#if 0 /* unused */
971	/**
972	* Function called by slirp to check if it's possible to feed incoming data to the network port.
973	* @returns 1 if possible.
974	* @returns 0 if not possible.
975	*/
976	int slirp_can_output(void *pvUser)
977	{
978	RT_NOREF(pvUser);
979	return 1;
980	}
981
982	static void slirp_push_recv_thread(void *pvUser)
983	{
984	PDRVNAT pThis = (PDRVNAT)pvUser;
985	Assert(pThis);
986	drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
987	}
988	#endif
989
990	void slirp_urg_output(void pvUser, struct mbuf m, const uint8_t *pu8Buf, int cb)
991	{
992	PDRVNAT pThis = (PDRVNAT)pvUser;
993	Assert(pThis);
994
995	/* don't queue new requests when the NAT thread is about to stop */
996	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
997	return;
998
999	ASMAtomicIncU32(&pThis->cUrgPkts);
1000	int rc = RTReqQueueCallEx(pThis->hUrgRecvReqQueue, NULL /ppReq/, 0 /cMillies/, RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
1001	(PFNRT)drvNATUrgRecvWorker, 4, pThis, pu8Buf, cb, m);
1002	AssertRC(rc);
1003	drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
1004	}
1005
1006	/**
1007	* Function called by slirp to wake up device after VERR_TRY_AGAIN
1008	*/
1009	void slirp_output_pending(void *pvUser)
1010	{
1011	PDRVNAT pThis = (PDRVNAT)pvUser;
1012	Assert(pThis);
1013	LogFlowFuncEnter();
1014	pThis->pIAboveNet->pfnXmitPending(pThis->pIAboveNet);
1015	LogFlowFuncLeave();
1016	}
1017
1018	/**
1019	* Function called by slirp to feed incoming data to the NIC.
1020	*/
1021	void slirp_output(void pvUser, struct mbuf m, const uint8_t *pu8Buf, int cb)
1022	{
1023	PDRVNAT pThis = (PDRVNAT)pvUser;
1024	Assert(pThis);
1025
1026	LogFlow(("slirp_output BEGIN %p %d\n", pu8Buf, cb));
1027	Log6(("slirp_output: pu8Buf=%p cb=%#x (pThis=%p)\n%.*Rhxd\n", pu8Buf, cb, pThis, cb, pu8Buf));
1028
1029	/* don't queue new requests when the NAT thread is about to stop */
1030	if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
1031	return;
1032
1033	ASMAtomicIncU32(&pThis->cPkts);
1034	int rc = RTReqQueueCallEx(pThis->hRecvReqQueue, NULL /ppReq/, 0 /cMillies/, RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
1035	(PFNRT)drvNATRecvWorker, 4, pThis, pu8Buf, cb, m);
1036	AssertRC(rc);
1037	drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
1038	STAM_COUNTER_INC(&pThis->StatQueuePktSent);
1039	LogFlowFuncLeave();
1040	}
1041
1042
1043	/*
1044	* Call a function on the slirp thread.
1045	*/
1046	int slirp_call(void pvUser, PRTREQ ppReq, RTMSINTERVAL cMillies, unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
1047	{
1048	PDRVNAT pThis = (PDRVNAT)pvUser;
1049	Assert(pThis);
1050
1051	int rc;
1052
1053	va_list va;
1054	va_start(va, cArgs);
1055
1056	rc = RTReqQueueCallV(pThis->hSlirpReqQueue, ppReq, cMillies, fFlags, pfnFunction, cArgs, va);
1057
1058	va_end(va);
1059
1060	if (RT_SUCCESS(rc))
1061	drvNATNotifyNATThread(pThis, "slirp_vcall");
1062
1063	return rc;
1064	}
1065
1066
1067	/*
1068	* Call a function on the host resolver thread.
1069	*/
1070	int slirp_call_hostres(void pvUser, PRTREQ ppReq, RTMSINTERVAL cMillies,
1071	unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
1072	{
1073	PDRVNAT pThis = (PDRVNAT)pvUser;
1074	Assert(pThis);
1075
1076	int rc;
1077
1078	AssertReturn((pThis->hHostResQueue != NIL_RTREQQUEUE), VERR_INVALID_STATE);
1079	AssertReturn((pThis->pHostResThread != NULL), VERR_INVALID_STATE);
1080
1081	va_list va;
1082	va_start(va, cArgs);
1083
1084	rc = RTReqQueueCallV(pThis->hHostResQueue, ppReq, cMillies, fFlags, pfnFunction, cArgs, va);
1085
1086	va_end(va);
1087	return rc;
1088	}
1089
1090
1091	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE && !defined(RT_OS_DARWIN)
1092	/**
1093	* @interface_method_impl{PDMINETWORKNATCONFIG,pfnNotifyDnsChanged}
1094	*
1095	* We are notified that host's resolver configuration has changed. In
1096	* the current setup we don't get any details and just reread that
1097	* information ourselves.
1098	*/
1099	static DECLCALLBACK(void) drvNATNotifyDnsChanged(PPDMINETWORKNATCONFIG pInterface)
1100	{
1101	PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
1102	drvNATUpdateDNS(pThis, /* fFlapLink */ true);
1103	}
1104	#endif
1105
1106	#ifdef RT_OS_DARWIN
1107	/**
1108	* Callback for the SystemConfiguration framework to notify us whenever the DNS
1109	* server changes.
1110	*
1111	* @param hDynStor The DynamicStore handle.
1112	* @param hChangedKey Array of changed keys we watch for.
1113	* @param pvUser Opaque user data (NAT driver instance).
1114	*/
1115	static DECLCALLBACK(void) drvNatDnsChanged(SCDynamicStoreRef hDynStor, CFArrayRef hChangedKeys, void *pvUser)
1116	{
1117	PDRVNAT pThis = (PDRVNAT)pvUser;
1118
1119	Log2(("NAT: System configuration has changed\n"));
1120
1121	/* Check if any of parameters we are interested in were actually changed. If the size
1122	* of hChangedKeys is 0, it means that SCDynamicStore has been restarted. */
1123	if (hChangedKeys && CFArrayGetCount(hChangedKeys) > 0)
1124	{
1125	/* Look to the updated parameters in particular. */
1126	CFStringRef pDNSKey = CFSTR("State:/Network/Global/DNS");
1127
1128	if (CFArrayContainsValue(hChangedKeys, CFRangeMake(0, CFArrayGetCount(hChangedKeys)), pDNSKey))
1129	{
1130	LogRel(("NAT: DNS servers changed, triggering reconnect\n"));
1131	#if 0
1132	CFDictionaryRef hDnsDict = (CFDictionaryRef)SCDynamicStoreCopyValue(hDynStor, pDNSKey);
1133	if (hDnsDict)
1134	{
1135	CFArrayRef hArrAddresses = (CFArrayRef)CFDictionaryGetValue(hDnsDict, kSCPropNetDNSServerAddresses);
1136	if (hArrAddresses && CFArrayGetCount(hArrAddresses) > 0)
1137	{
1138	/* Dump DNS servers list. */
1139	for (int i = 0; i < CFArrayGetCount(hArrAddresses); i++)
1140	{
1141	CFStringRef pDNSAddrStr = (CFStringRef)CFArrayGetValueAtIndex(hArrAddresses, i);
1142	const char *pszDNSAddr = pDNSAddrStr ? CFStringGetCStringPtr(pDNSAddrStr, CFStringGetSystemEncoding()) : NULL;
1143	LogRel(("NAT: New DNS server#%d: %s\n", i, pszDNSAddr ? pszDNSAddr : "None"));
1144	}
1145	}
1146	else
1147	LogRel(("NAT: DNS server list is empty (1)\n"));
1148
1149	CFRelease(hDnsDict);
1150	}
1151	else
1152	LogRel(("NAT: DNS server list is empty (2)\n"));
1153	#else
1154	RT_NOREF(hDynStor);
1155	#endif
1156	drvNATUpdateDNS(pThis, /* fFlapLink */ true);
1157	}
1158	else
1159	Log2(("NAT: No DNS changes detected\n"));
1160	}
1161	else
1162	Log2(("NAT: SCDynamicStore has been restarted\n"));
1163	}
1164	#endif
1165
1166	/**
1167	* @interface_method_impl{PDMIBASE,pfnQueryInterface}
1168	*/
1169	static DECLCALLBACK(void ) drvNATQueryInterface(PPDMIBASE pInterface, const char pszIID)
1170	{
1171	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
1172	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1173
1174	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
1175	PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKUP, &pThis->INetworkUp);
1176	PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKNATCONFIG, &pThis->INetworkNATCfg);
1177	return NULL;
1178	}
1179
1180
1181	/**
1182	* Get the MAC address into the slirp stack.
1183	*
1184	* Called by drvNATLoadDone and drvNATPowerOn.
1185	*/
1186	static void drvNATSetMac(PDRVNAT pThis)
1187	{
1188	#if 0 /* XXX: do we still need this for anything? */
1189	if (pThis->pIAboveConfig)
1190	{
1191	RTMAC Mac;
1192	pThis->pIAboveConfig->pfnGetMac(pThis->pIAboveConfig, &Mac);
1193	}
1194	#else
1195	RT_NOREF(pThis);
1196	#endif
1197	}
1198
1199
1200	/**
1201	* After loading we have to pass the MAC address of the ethernet device to the slirp stack.
1202	* Otherwise the guest is not reachable until it performs a DHCP request or an ARP request
1203	* (usually done during guest boot).
1204	*/
1205	static DECLCALLBACK(int) drvNATLoadDone(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM)
1206	{
1207	RT_NOREF(pSSM);
1208	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1209	drvNATSetMac(pThis);
1210	return VINF_SUCCESS;
1211	}
1212
1213
1214	/**
1215	* Some guests might not use DHCP to retrieve an IP but use a static IP.
1216	*/
1217	static DECLCALLBACK(void) drvNATPowerOn(PPDMDRVINS pDrvIns)
1218	{
1219	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1220	drvNATSetMac(pThis);
1221	}
1222
1223
1224	/**
1225	* @interface_method_impl{PDMDRVREG,pfnResume}
1226	*/
1227	static DECLCALLBACK(void) drvNATResume(PPDMDRVINS pDrvIns)
1228	{
1229	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1230	VMRESUMEREASON enmReason = PDMDrvHlpVMGetResumeReason(pDrvIns);
1231
1232	switch (enmReason)
1233	{
1234	case VMRESUMEREASON_HOST_RESUME:
1235	bool fFlapLink;
1236	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE
1237	/* let event handler do it if necessary */
1238	fFlapLink = false;
1239	#else
1240	/* XXX: when in doubt, use brute force */
1241	fFlapLink = true;
1242	#endif
1243	drvNATUpdateDNS(pThis, fFlapLink);
1244	return;
1245	default: /* Ignore every other resume reason. */
1246	/* do nothing */
1247	return;
1248	}
1249	}
1250
1251
1252	static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis)
1253	{
1254	slirpReleaseDnsSettings(pThis->pNATState);
1255	slirpInitializeDnsSettings(pThis->pNATState);
1256	return VINF_SUCCESS;
1257	}
1258
1259	/**
1260	* This function at this stage could be called from two places, but both from non-NAT thread,
1261	* - drvNATResume (EMT?)
1262	* - drvNatDnsChanged (darwin, GUI or main) "listener"
1263	* When Main's interface IHost will support host network configuration change event on every host,
1264	* we won't call it from drvNATResume, but from listener of Main event in the similar way it done
1265	* for port-forwarding, and it wan't be on GUI/main thread, but on EMT thread only.
1266	*
1267	* Thread here is important, because we need to change DNS server list and domain name (+ perhaps,
1268	* search string) at runtime (VBOX_NAT_ENFORCE_INTERNAL_DNS_UPDATE), we can do it safely on NAT thread,
1269	* so with changing other variables (place where we handle update) the main mechanism of update
1270	* _won't_ be changed, the only thing will change is drop of fFlapLink parameter.
1271	*/
1272	DECLINLINE(void) drvNATUpdateDNS(PDRVNAT pThis, bool fFlapLink)
1273	{
1274	int strategy = slirp_host_network_configuration_change_strategy_selector(pThis->pNATState);
1275	switch (strategy)
1276	{
1277	case VBOX_NAT_DNS_DNSPROXY:
1278	{
1279	/**
1280	* XXX: Here or in _strategy_selector we should deal with network change
1281	* in "network change" scenario domain name change we have to update guest lease
1282	* forcibly.
1283	* Note at that built-in dhcp also updates DNS information on NAT thread.
1284	*/
1285	/**
1286	* It's unsafe to to do it directly on non-NAT thread
1287	* so we schedule the worker and kick the NAT thread.
1288	*/
1289	int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, NULL /ppReq/, 0 /cMillies/, RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
1290	(PFNRT)drvNATReinitializeHostNameResolving, 1, pThis);
1291	if (RT_SUCCESS(rc))
1292	drvNATNotifyNATThread(pThis, "drvNATUpdateDNS");
1293
1294	return;
1295	}
1296
1297	case VBOX_NAT_DNS_EXTERNAL:
1298	/*
1299	* Host resumed from a suspend and the network might have changed.
1300	* Disconnect the guest from the network temporarily to let it pick up the changes.
1301	*/
1302	if (fFlapLink)
1303	pThis->pIAboveConfig->pfnSetLinkState(pThis->pIAboveConfig,
1304	PDMNETWORKLINKSTATE_DOWN_RESUME);
1305	return;
1306
1307	case VBOX_NAT_DNS_HOSTRESOLVER:
1308	default:
1309	return;
1310	}
1311	}
1312
1313
1314	/**
1315	* Info handler.
1316	*/
1317	static DECLCALLBACK(void) drvNATInfo(PPDMDRVINS pDrvIns, PCDBGFINFOHLP pHlp, const char *pszArgs)
1318	{
1319	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1320	slirp_info(pThis->pNATState, pHlp, pszArgs);
1321	}
1322
1323	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1324	static int drvNATConstructDNSMappings(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pMappingsCfg)
1325	{
1326	PPDMDRVINS pDrvIns = pThis->pDrvIns;
1327	PCPDMDRVHLPR3 pHlp = pDrvIns->pHlpR3;
1328
1329	RT_NOREF(iInstance);
1330	int rc = VINF_SUCCESS;
1331	LogFlowFunc(("ENTER: iInstance:%d\n", iInstance));
1332	for (PCFGMNODE pNode = pHlp->pfnCFGMGetFirstChild(pMappingsCfg); pNode; pNode = pHlp->pfnCFGMGetNextChild(pNode))
1333	{
1334	if (!pHlp->pfnCFGMAreValuesValid(pNode, "HostName\0HostNamePattern\0HostIP\0"))
1335	return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1336	N_("Unknown configuration in dns mapping"));
1337	char szHostNameOrPattern[255];
1338	bool fPattern = false;
1339	RT_ZERO(szHostNameOrPattern);
1340	GET_STRING(rc, pDrvIns, pNode, "HostName", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1341	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1342	{
1343	GET_STRING(rc, pDrvIns, pNode, "HostNamePattern", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1344	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1345	{
1346	char szNodeName[225];
1347	RT_ZERO(szNodeName);
1348	pHlp->pfnCFGMGetName(pNode, szNodeName, sizeof(szNodeName));
1349	LogRel(("NAT: Neither 'HostName' nor 'HostNamePattern' is specified for mapping %s\n", szNodeName));
1350	continue;
1351	}
1352	fPattern = true;
1353	}
1354	struct in_addr HostIP;
1355	RT_ZERO(HostIP);
1356	GETIP_DEF(rc, pDrvIns, pNode, HostIP, INADDR_ANY);
1357	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1358	{
1359	LogRel(("NAT: DNS mapping %s is ignored (address not pointed)\n", szHostNameOrPattern));
1360	continue;
1361	}
1362	slirp_add_host_resolver_mapping(pThis->pNATState, szHostNameOrPattern, fPattern, HostIP.s_addr);
1363	}
1364	LogFlowFunc(("LEAVE: %Rrc\n", rc));
1365	return rc;
1366	}
1367	#endif /* !VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER */
1368
1369
1370	/**
1371	* Sets up the redirectors.
1372	*
1373	* @returns VBox status code.
1374	* @param pCfg The configuration handle.
1375	*/
1376	static int drvNATConstructRedir(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pCfg, PRTNETADDRIPV4 pNetwork)
1377	{
1378	PPDMDRVINS pDrvIns = pThis->pDrvIns;
1379	PCPDMDRVHLPR3 pHlp = pDrvIns->pHlpR3;
1380
1381	RT_NOREF(pNetwork); /** @todo figure why pNetwork isn't used */
1382
1383	PCFGMNODE pPFTree = pHlp->pfnCFGMGetChild(pCfg, "PortForwarding");
1384	if (pPFTree == NULL)
1385	return VINF_SUCCESS;
1386
1387	/*
1388	* Enumerate redirections.
1389	*/
1390	for (PCFGMNODE pNode = pHlp->pfnCFGMGetFirstChild(pPFTree); pNode; pNode = pHlp->pfnCFGMGetNextChild(pNode))
1391	{
1392	/*
1393	* Validate the port forwarding config.
1394	*/
1395	if (!pHlp->pfnCFGMAreValuesValid(pNode, "Name\0Protocol\0UDP\0HostPort\0GuestPort\0GuestIP\0BindIP\0"))
1396	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1397	N_("Unknown configuration in port forwarding"));
1398
1399	/* protocol type */
1400	bool fUDP;
1401	char szProtocol[32];
1402	int rc;
1403	GET_STRING(rc, pDrvIns, pNode, "Protocol", szProtocol[0], sizeof(szProtocol));
1404	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1405	{
1406	fUDP = false;
1407	GET_BOOL(rc, pDrvIns, pNode, "UDP", fUDP);
1408	}
1409	else if (RT_SUCCESS(rc))
1410	{
1411	if (!RTStrICmp(szProtocol, "TCP"))
1412	fUDP = false;
1413	else if (!RTStrICmp(szProtocol, "UDP"))
1414	fUDP = true;
1415	else
1416	return PDMDrvHlpVMSetError(pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
1417	N_("NAT#%d: Invalid configuration value for \"Protocol\": \"%s\""),
1418	iInstance, szProtocol);
1419	}
1420	else
1421	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1422	N_("NAT#%d: configuration query for \"Protocol\" failed"),
1423	iInstance);
1424	/* host port */
1425	int32_t iHostPort;
1426	GET_S32_STRICT(rc, pDrvIns, pNode, "HostPort", iHostPort);
1427
1428	/* guest port */
1429	int32_t iGuestPort;
1430	GET_S32_STRICT(rc, pDrvIns, pNode, "GuestPort", iGuestPort);
1431
1432	/* host address ("BindIP" name is rather unfortunate given "HostPort" to go with it) */
1433	struct in_addr BindIP;
1434	RT_ZERO(BindIP);
1435	GETIP_DEF(rc, pDrvIns, pNode, BindIP, INADDR_ANY);
1436
1437	/* guest address */
1438	struct in_addr GuestIP;
1439	RT_ZERO(GuestIP);
1440	GETIP_DEF(rc, pDrvIns, pNode, GuestIP, INADDR_ANY);
1441
1442	/*
1443	* Call slirp about it.
1444	*/
1445	if (slirp_add_redirect(pThis->pNATState, fUDP, BindIP, iHostPort, GuestIP, iGuestPort) < 0)
1446	return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_SETUP, RT_SRC_POS,
1447	N_("NAT#%d: configuration error: failed to set up "
1448	"redirection of %d to %d. Probably a conflict with "
1449	"existing services or other rules"), iInstance, iHostPort,
1450	iGuestPort);
1451	} /* for each redir rule */
1452
1453	return VINF_SUCCESS;
1454	}
1455
1456
1457	/**
1458	* Destruct a driver instance.
1459	*
1460	* Most VM resources are freed by the VM. This callback is provided so that any non-VM
1461	* resources can be freed correctly.
1462	*
1463	* @param pDrvIns The driver instance data.
1464	*/
1465	static DECLCALLBACK(void) drvNATDestruct(PPDMDRVINS pDrvIns)
1466	{
1467	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1468	LogFlow(("drvNATDestruct:\n"));
1469	PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
1470
1471	if (pThis->pNATState)
1472	{
1473	slirp_term(pThis->pNATState);
1474	slirp_deregister_statistics(pThis->pNATState, pDrvIns);
1475	#ifdef VBOX_WITH_STATISTICS
1476	# define DRV_PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1477	# define DRV_COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1478	# include "counters.h"
1479	#endif
1480	pThis->pNATState = NULL;
1481	}
1482
1483	RTReqQueueDestroy(pThis->hHostResQueue);
1484	pThis->hHostResQueue = NIL_RTREQQUEUE;
1485
1486	RTReqQueueDestroy(pThis->hSlirpReqQueue);
1487	pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1488
1489	RTReqQueueDestroy(pThis->hUrgRecvReqQueue);
1490	pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1491
1492	RTReqQueueDestroy(pThis->hRecvReqQueue);
1493	pThis->hRecvReqQueue = NIL_RTREQQUEUE;
1494
1495	RTSemEventDestroy(pThis->EventRecv);
1496	pThis->EventRecv = NIL_RTSEMEVENT;
1497
1498	RTSemEventDestroy(pThis->EventUrgRecv);
1499	pThis->EventUrgRecv = NIL_RTSEMEVENT;
1500
1501	if (RTCritSectIsInitialized(&pThis->DevAccessLock))
1502	RTCritSectDelete(&pThis->DevAccessLock);
1503
1504	if (RTCritSectIsInitialized(&pThis->XmitLock))
1505	RTCritSectDelete(&pThis->XmitLock);
1506
1507	#ifndef RT_OS_WINDOWS
1508	RTPipeClose(pThis->hPipeRead);
1509	RTPipeClose(pThis->hPipeWrite);
1510	#endif
1511
1512	#ifdef RT_OS_DARWIN
1513	/* Cleanup the DNS watcher. */
1514	if (pThis->hRunLoopSrcDnsWatcher != NULL)
1515	{
1516	CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1517	CFRetain(hRunLoopMain);
1518	CFRunLoopRemoveSource(hRunLoopMain, pThis->hRunLoopSrcDnsWatcher, kCFRunLoopCommonModes);
1519	CFRelease(hRunLoopMain);
1520	CFRelease(pThis->hRunLoopSrcDnsWatcher);
1521	pThis->hRunLoopSrcDnsWatcher = NULL;
1522	}
1523	#endif
1524	}
1525
1526
1527	/**
1528	* Construct a NAT network transport driver instance.
1529	*
1530	* @copydoc FNPDMDRVCONSTRUCT
1531	*/
1532	static DECLCALLBACK(int) drvNATConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
1533	{
1534	RT_NOREF(fFlags);
1535	PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
1536	PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1537	PCPDMDRVHLPR3 pHlp = pDrvIns->pHlpR3;
1538
1539	LogFlow(("drvNATConstruct:\n"));
1540
1541	/*
1542	* Init the static parts.
1543	*/
1544	pThis->pDrvIns = pDrvIns;
1545	pThis->pNATState = NULL;
1546	pThis->pszTFTPPrefix = NULL;
1547	pThis->pszBootFile = NULL;
1548	pThis->pszNextServer = NULL;
1549	pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1550	pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1551	pThis->hHostResQueue = NIL_RTREQQUEUE;
1552	pThis->EventRecv = NIL_RTSEMEVENT;
1553	pThis->EventUrgRecv = NIL_RTSEMEVENT;
1554	#ifdef RT_OS_DARWIN
1555	pThis->hRunLoopSrcDnsWatcher = NULL;
1556	#endif
1557
1558	/* IBase */
1559	pDrvIns->IBase.pfnQueryInterface = drvNATQueryInterface;
1560
1561	/* INetwork */
1562	pThis->INetworkUp.pfnBeginXmit = drvNATNetworkUp_BeginXmit;
1563	pThis->INetworkUp.pfnAllocBuf = drvNATNetworkUp_AllocBuf;
1564	pThis->INetworkUp.pfnFreeBuf = drvNATNetworkUp_FreeBuf;
1565	pThis->INetworkUp.pfnSendBuf = drvNATNetworkUp_SendBuf;
1566	pThis->INetworkUp.pfnEndXmit = drvNATNetworkUp_EndXmit;
1567	pThis->INetworkUp.pfnSetPromiscuousMode = drvNATNetworkUp_SetPromiscuousMode;
1568	pThis->INetworkUp.pfnNotifyLinkChanged = drvNATNetworkUp_NotifyLinkChanged;
1569
1570	/* NAT engine configuration */
1571	pThis->INetworkNATCfg.pfnRedirectRuleCommand = drvNATNetworkNatConfigRedirect;
1572	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE && !defined(RT_OS_DARWIN)
1573	/*
1574	* On OS X we stick to the old OS X specific notifications for
1575	* now. Elsewhere use IHostNameResolutionConfigurationChangeEvent
1576	* by enbaling HAVE_NOTIFICATION_FOR_DNS_UPDATE in libslirp.h.
1577	* This code is still in a bit of flux and is implemented and
1578	* enabled in steps to simplify more conservative backporting.
1579	*/
1580	pThis->INetworkNATCfg.pfnNotifyDnsChanged = drvNATNotifyDnsChanged;
1581	#else
1582	pThis->INetworkNATCfg.pfnNotifyDnsChanged = NULL;
1583	#endif
1584
1585	/*
1586	* Validate the config.
1587	*/
1588	PDMDRV_VALIDATE_CONFIG_RETURN(pDrvIns,
1589	"PassDomain"
1590	"\|TFTPPrefix"
1591	"\|BootFile"
1592	"\|Network"
1593	"\|NextServer"
1594	"\|DNSProxy"
1595	"\|BindIP"
1596	"\|UseHostResolver"
1597	"\|SlirpMTU"
1598	"\|AliasMode"
1599	"\|SockRcv"
1600	"\|SockSnd"
1601	"\|TcpRcv"
1602	"\|TcpSnd"
1603	"\|ICMPCacheLimit"
1604	"\|SoMaxConnection"
1605	"\|LocalhostReachable"
1606	//#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1607	"\|HostResolverMappings"
1608	//#endif
1609	, "PortForwarding");
1610
1611	/*
1612	* Get the configuration settings.
1613	*/
1614	int rc;
1615	bool fPassDomain = true;
1616	GET_BOOL(rc, pDrvIns, pCfg, "PassDomain", fPassDomain);
1617
1618	GET_STRING_ALLOC(rc, pDrvIns, pCfg, "TFTPPrefix", pThis->pszTFTPPrefix);
1619	GET_STRING_ALLOC(rc, pDrvIns, pCfg, "BootFile", pThis->pszBootFile);
1620	GET_STRING_ALLOC(rc, pDrvIns, pCfg, "NextServer", pThis->pszNextServer);
1621
1622	int fDNSProxy = 0;
1623	GET_S32(rc, pDrvIns, pCfg, "DNSProxy", fDNSProxy);
1624	int fUseHostResolver = 0;
1625	GET_S32(rc, pDrvIns, pCfg, "UseHostResolver", fUseHostResolver);
1626	int MTU = 1500;
1627	GET_S32(rc, pDrvIns, pCfg, "SlirpMTU", MTU);
1628	int i32AliasMode = 0;
1629	int i32MainAliasMode = 0;
1630	GET_S32(rc, pDrvIns, pCfg, "AliasMode", i32MainAliasMode);
1631	int iIcmpCacheLimit = 100;
1632	GET_S32(rc, pDrvIns, pCfg, "ICMPCacheLimit", iIcmpCacheLimit);
1633	bool fLocalhostReachable = false;
1634	GET_BOOL(rc, pDrvIns, pCfg, "LocalhostReachable", fLocalhostReachable);
1635
1636	i32AliasMode \|= (i32MainAliasMode & 0x1 ? 0x1 : 0);
1637	i32AliasMode \|= (i32MainAliasMode & 0x2 ? 0x40 : 0);
1638	i32AliasMode \|= (i32MainAliasMode & 0x4 ? 0x4 : 0);
1639	int i32SoMaxConn = 10;
1640	GET_S32(rc, pDrvIns, pCfg, "SoMaxConnection", i32SoMaxConn);
1641	/*
1642	* Query the network port interface.
1643	*/
1644	pThis->pIAboveNet = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKDOWN);
1645	if (!pThis->pIAboveNet)
1646	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1647	N_("Configuration error: the above device/driver didn't "
1648	"export the network port interface"));
1649	pThis->pIAboveConfig = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKCONFIG);
1650	if (!pThis->pIAboveConfig)
1651	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1652	N_("Configuration error: the above device/driver didn't "
1653	"export the network config interface"));
1654
1655	/* Generate a network address for this network card. */
1656	char szNetwork[32]; /* xxx.xxx.xxx.xxx/yy */
1657	GET_STRING(rc, pDrvIns, pCfg, "Network", szNetwork[0], sizeof(szNetwork));
1658	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1659	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT%d: Configuration error: missing network"),
1660	pDrvIns->iInstance);
1661
1662	RTNETADDRIPV4 Network, Netmask;
1663
1664	rc = RTCidrStrToIPv4(szNetwork, &Network, &Netmask);
1665	if (RT_FAILURE(rc))
1666	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1667	N_("NAT#%d: Configuration error: network '%s' describes not a valid IPv4 network"),
1668	pDrvIns->iInstance, szNetwork);
1669
1670	/*
1671	* Initialize slirp.
1672	*/
1673	rc = slirp_init(&pThis->pNATState, RT_H2N_U32(Network.u), Netmask.u,
1674	fPassDomain, !!fUseHostResolver, i32AliasMode,
1675	iIcmpCacheLimit, fLocalhostReachable, pThis);
1676	if (RT_SUCCESS(rc))
1677	{
1678	slirp_set_dhcp_TFTP_prefix(pThis->pNATState, pThis->pszTFTPPrefix);
1679	slirp_set_dhcp_TFTP_bootfile(pThis->pNATState, pThis->pszBootFile);
1680	slirp_set_dhcp_next_server(pThis->pNATState, pThis->pszNextServer);
1681	slirp_set_dhcp_dns_proxy(pThis->pNATState, !!fDNSProxy);
1682	slirp_set_mtu(pThis->pNATState, MTU);
1683	slirp_set_somaxconn(pThis->pNATState, i32SoMaxConn);
1684
1685	char *pszBindIP = NULL;
1686	GET_STRING_ALLOC(rc, pDrvIns, pCfg, "BindIP", pszBindIP);
1687	slirp_set_binding_address(pThis->pNATState, pszBindIP);
1688	if (pszBindIP != NULL)
1689	PDMDrvHlpMMHeapFree(pDrvIns, pszBindIP);
1690
1691	#define SLIRP_SET_TUNING_VALUE(name, setter) \
1692	do \
1693	{ \
1694	int len = 0; \
1695	rc = pHlp->pfnCFGMQueryS32(pCfg, name, &len); \
1696	if (RT_SUCCESS(rc)) \
1697	setter(pThis->pNATState, len); \
1698	} while(0)
1699
1700	SLIRP_SET_TUNING_VALUE("SockRcv", slirp_set_rcvbuf);
1701	SLIRP_SET_TUNING_VALUE("SockSnd", slirp_set_sndbuf);
1702	SLIRP_SET_TUNING_VALUE("TcpRcv", slirp_set_tcp_rcvspace);
1703	SLIRP_SET_TUNING_VALUE("TcpSnd", slirp_set_tcp_sndspace);
1704
1705	slirp_register_statistics(pThis->pNATState, pDrvIns);
1706	#ifdef VBOX_WITH_STATISTICS
1707	# define DRV_PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
1708	# define DRV_COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
1709	# include "counters.h"
1710	#endif
1711
1712	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1713	PCFGMNODE pMappingsCfg = pHlp->pfnCFGMGetChild(pCfg, "HostResolverMappings");
1714
1715	if (pMappingsCfg)
1716	{
1717	rc = drvNATConstructDNSMappings(pDrvIns->iInstance, pThis, pMappingsCfg);
1718	AssertRC(rc);
1719	}
1720	#endif
1721	rc = drvNATConstructRedir(pDrvIns->iInstance, pThis, pCfg, &Network);
1722	if (RT_SUCCESS(rc))
1723	{
1724	/*
1725	* Register a load done notification to get the MAC address into the slirp
1726	* engine after we loaded a guest state.
1727	*/
1728	rc = PDMDrvHlpSSMRegisterLoadDone(pDrvIns, drvNATLoadDone);
1729	AssertLogRelRCReturn(rc, rc);
1730
1731	rc = RTReqQueueCreate(&pThis->hSlirpReqQueue);
1732	AssertLogRelRCReturn(rc, rc);
1733
1734	rc = RTReqQueueCreate(&pThis->hRecvReqQueue);
1735	AssertLogRelRCReturn(rc, rc);
1736
1737	rc = RTReqQueueCreate(&pThis->hUrgRecvReqQueue);
1738	AssertLogRelRCReturn(rc, rc);
1739
1740	rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pRecvThread, pThis, drvNATRecv,
1741	drvNATRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATRX");
1742	AssertRCReturn(rc, rc);
1743
1744	rc = RTSemEventCreate(&pThis->EventRecv);
1745	AssertRCReturn(rc, rc);
1746
1747	rc = RTSemEventCreate(&pThis->EventUrgRecv);
1748	AssertRCReturn(rc, rc);
1749
1750	rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pUrgRecvThread, pThis, drvNATUrgRecv,
1751	drvNATUrgRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATURGRX");
1752	AssertRCReturn(rc, rc);
1753
1754	rc = RTReqQueueCreate(&pThis->hHostResQueue);
1755	AssertRCReturn(rc, rc);
1756
1757	#if defined(RT_OS_LINUX) && defined(RT_ARCH_ARM64)
1758	/* 64KiB stacks are not supported at least linux.arm64 (thread creation fails). */
1759	size_t const cbStack = _128K;
1760	#else
1761	size_t const cbStack = _64K;
1762	#endif
1763	rc = PDMDrvHlpThreadCreate(pThis->pDrvIns, &pThis->pHostResThread,
1764	pThis, drvNATHostResThread, drvNATHostResWakeup,
1765	cbStack, RTTHREADTYPE_IO, "HOSTRES");
1766	AssertRCReturn(rc, rc);
1767
1768	rc = RTCritSectInit(&pThis->DevAccessLock);
1769	AssertRCReturn(rc, rc);
1770
1771	rc = RTCritSectInit(&pThis->XmitLock);
1772	AssertRCReturn(rc, rc);
1773
1774	char szTmp[128];
1775	RTStrPrintf(szTmp, sizeof(szTmp), "nat%d", pDrvIns->iInstance);
1776	PDMDrvHlpDBGFInfoRegister(pDrvIns, szTmp, "NAT info.", drvNATInfo);
1777
1778	#ifndef RT_OS_WINDOWS
1779	/*
1780	* Create the control pipe.
1781	*/
1782	rc = RTPipeCreate(&pThis->hPipeRead, &pThis->hPipeWrite, 0 /fFlags/);
1783	AssertRCReturn(rc, rc);
1784	#else
1785	pThis->hWakeupEvent = CreateEvent(NULL, FALSE, FALSE, NULL); /* auto-reset event */
1786	slirp_register_external_event(pThis->pNATState, pThis->hWakeupEvent,
1787	VBOX_WAKEUP_EVENT_INDEX);
1788	#endif
1789
1790	rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pSlirpThread, pThis, drvNATAsyncIoThread,
1791	drvNATAsyncIoWakeup, 128 * _1K, RTTHREADTYPE_IO, "NAT");
1792	AssertRCReturn(rc, rc);
1793
1794	pThis->enmLinkState = pThis->enmLinkStateWant = PDMNETWORKLINKSTATE_UP;
1795
1796	#ifdef RT_OS_DARWIN
1797	/* Set up a watcher which notifies us everytime the DNS server changes. */
1798	int rc2 = VINF_SUCCESS;
1799	SCDynamicStoreContext SCDynStorCtx;
1800
1801	SCDynStorCtx.version = 0;
1802	SCDynStorCtx.info = pThis;
1803	SCDynStorCtx.retain = NULL;
1804	SCDynStorCtx.release = NULL;
1805	SCDynStorCtx.copyDescription = NULL;
1806
1807	SCDynamicStoreRef hDynStor = SCDynamicStoreCreate(NULL, CFSTR("org.virtualbox.drvnat"), drvNatDnsChanged, &SCDynStorCtx);
1808	if (hDynStor)
1809	{
1810	CFRunLoopSourceRef hRunLoopSrc = SCDynamicStoreCreateRunLoopSource(NULL, hDynStor, 0);
1811	if (hRunLoopSrc)
1812	{
1813	CFStringRef aWatchKeys[] =
1814	{
1815	CFSTR("State:/Network/Global/DNS")
1816	};
1817	CFArrayRef hArray = CFArrayCreate(NULL, (const void **)aWatchKeys, 1, &kCFTypeArrayCallBacks);
1818
1819	if (hArray)
1820	{
1821	if (SCDynamicStoreSetNotificationKeys(hDynStor, hArray, NULL))
1822	{
1823	CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1824	CFRetain(hRunLoopMain);
1825	CFRunLoopAddSource(hRunLoopMain, hRunLoopSrc, kCFRunLoopCommonModes);
1826	CFRelease(hRunLoopMain);
1827	pThis->hRunLoopSrcDnsWatcher = hRunLoopSrc;
1828	}
1829	else
1830	rc2 = VERR_NO_MEMORY;
1831
1832	CFRelease(hArray);
1833	}
1834	else
1835	rc2 = VERR_NO_MEMORY;
1836
1837	if (RT_FAILURE(rc2)) /* Keep the runloop source referenced for destruction. */
1838	CFRelease(hRunLoopSrc);
1839	}
1840	CFRelease(hDynStor);
1841	}
1842	else
1843	rc2 = VERR_NO_MEMORY;
1844
1845	if (RT_FAILURE(rc2))
1846	LogRel(("NAT#%d: Failed to install DNS change notifier. The guest might loose DNS access when switching networks on the host\n",
1847	pDrvIns->iInstance));
1848	#endif
1849	return rc;
1850	}
1851
1852	/* failure path */
1853	slirp_term(pThis->pNATState);
1854	pThis->pNATState = NULL;
1855	}
1856	else
1857	{
1858	PDMDRV_SET_ERROR(pDrvIns, rc, N_("Unknown error during NAT networking setup: "));
1859	AssertMsgFailed(("Add error message for rc=%d (%Rrc)\n", rc, rc));
1860	}
1861
1862	return rc;
1863	}
1864
1865
1866	/**
1867	* NAT network transport driver registration record.
1868	*/
1869	const PDMDRVREG g_DrvNAT =
1870	{
1871	/* u32Version */
1872	PDM_DRVREG_VERSION,
1873	/* szName */
1874	"NAT",
1875	/* szRCMod */
1876	"",
1877	/* szR0Mod */
1878	"",
1879	/* pszDescription */
1880	"NAT Network Transport Driver",
1881	/* fFlags */
1882	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1883	/* fClass. */
1884	PDM_DRVREG_CLASS_NETWORK,
1885	/* cMaxInstances */
1886	~0U,
1887	/* cbInstance */
1888	sizeof(DRVNAT),
1889	/* pfnConstruct */
1890	drvNATConstruct,
1891	/* pfnDestruct */
1892	drvNATDestruct,
1893	/* pfnRelocate */
1894	NULL,
1895	/* pfnIOCtl */
1896	NULL,
1897	/* pfnPowerOn */
1898	drvNATPowerOn,
1899	/* pfnReset */
1900	NULL,
1901	/* pfnSuspend */
1902	NULL,
1903	/* pfnResume */
1904	drvNATResume,
1905	/* pfnAttach */
1906	NULL,
1907	/* pfnDetach */
1908	NULL,
1909	/* pfnPowerOff */
1910	NULL,
1911	/* pfnSoftReset */
1912	NULL,
1913	/* u32EndVersion */
1914	PDM_DRVREG_VERSION
1915	};

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source: vbox/trunk/src/VBox/Devices/Network/DrvNAT.cpp@ 105381

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