VirtualBox

source: vbox/trunk/src/VBox/Devices/Network/DrvNAT.cpp@ 50257

Last change on this file since 50257 was 50061, checked in by vboxsync, 11 years ago

NAT/DrvNAT.cpp: pasto drvNATHostNetworkConfigurationChangeEventStrategySelector while calling drvNATNotifyNATThread(, whois) should introduce iself correctly.
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1/* $Id: DrvNAT.cpp 50061 2014-01-13 12:14:39Z vboxsync $ */
2/** @file
3 * DrvNAT - NAT network transport driver.
4 */
5
6/*
7 * Copyright (C) 2006-2012 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"
26extern "C" {
27#include "slirp/slirp_dns.h"
28}
29#include "slirp/ctl.h"
30
31#include <VBox/vmm/dbgf.h>
32#include <VBox/vmm/pdmdrv.h>
33#include <VBox/vmm/pdmnetifs.h>
34#include <VBox/vmm/pdmnetinline.h>
35
36#include <iprt/assert.h>
37#include <iprt/critsect.h>
38#include <iprt/cidr.h>
39#include <iprt/file.h>
40#include <iprt/mem.h>
41#include <iprt/pipe.h>
42#include <iprt/string.h>
43#include <iprt/stream.h>
44#include <iprt/uuid.h>
45
46#include "VBoxDD.h"
47
48#ifndef RT_OS_WINDOWS
49# include <unistd.h>
50# include <fcntl.h>
51# include <poll.h>
52# include <errno.h>
53#endif
54#ifdef RT_OS_FREEBSD
55# include <netinet/in.h>
56#endif
57#include <iprt/semaphore.h>
58#include <iprt/req.h>
59#ifdef RT_OS_DARWIN
60# include <SystemConfiguration/SystemConfiguration.h>
61# include <CoreFoundation/CoreFoundation.h>
62#endif
63
64#define COUNTERS_INIT
65#include "counters.h"
66
67
68/*******************************************************************************
69* Defined Constants And Macros *
70*******************************************************************************/
71
72#define DRVNAT_MAXFRAMESIZE (16 * 1024)
73
74/**
75 * @todo: This is a bad hack to prevent freezing the guest during high network
76 * activity. Windows host only. This needs to be fixed properly.
77 */
78#define VBOX_NAT_DELAY_HACK
79
80#define GET_EXTRADATA(pthis, node, name, rc, type, type_name, var) \
81do { \
82 (rc) = CFGMR3Query ## type((node), name, &(var)); \
83 if (RT_FAILURE((rc)) && (rc) != VERR_CFGM_VALUE_NOT_FOUND) \
84 return PDMDrvHlpVMSetError((pthis)->pDrvIns, (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \""name"\" " #type_name " failed"), \
85 (pthis)->pDrvIns->iInstance); \
86} while (0)
87
88#define GET_ED_STRICT(pthis, node, name, rc, type, type_name, var) \
89do { \
90 (rc) = CFGMR3Query ## type((node), name, &(var)); \
91 if (RT_FAILURE((rc))) \
92 return PDMDrvHlpVMSetError((pthis)->pDrvIns, (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \""name"\" " #type_name " failed"), \
93 (pthis)->pDrvIns->iInstance); \
94} while (0)
95
96#define GET_EXTRADATA_N(pthis, node, name, rc, type, type_name, var, var_size) \
97do { \
98 (rc) = CFGMR3Query ## type((node), name, &(var), var_size); \
99 if (RT_FAILURE((rc)) && (rc) != VERR_CFGM_VALUE_NOT_FOUND) \
100 return PDMDrvHlpVMSetError((pthis)->pDrvIns, (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \""name"\" " #type_name " failed"), \
101 (pthis)->pDrvIns->iInstance); \
102} while (0)
103
104#define GET_BOOL(rc, pthis, node, name, var) \
105 GET_EXTRADATA(pthis, node, name, (rc), Bool, bolean, (var))
106#define GET_STRING(rc, pthis, node, name, var, var_size) \
107 GET_EXTRADATA_N(pthis, node, name, (rc), String, string, (var), (var_size))
108#define GET_STRING_ALLOC(rc, pthis, node, name, var) \
109 GET_EXTRADATA(pthis, node, name, (rc), StringAlloc, string, (var))
110#define GET_S32(rc, pthis, node, name, var) \
111 GET_EXTRADATA(pthis, node, name, (rc), S32, int, (var))
112#define GET_S32_STRICT(rc, pthis, node, name, var) \
113 GET_ED_STRICT(pthis, node, name, (rc), S32, int, (var))
114
115
116
117#define DO_GET_IP(rc, node, instance, status, x) \
118do { \
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) \
126do \
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* Structures and Typedefs *
136*******************************************************************************/
137/**
138 * NAT network transport driver instance data.
139 *
140 * @implements PDMINETWORKUP
141 */
142typedef struct DRVNAT
143{
144 /** The network interface. */
145 PDMINETWORKUP INetworkUp;
146 /** The network NAT Engine configureation. */
147 PDMINETWORKNATCONFIG INetworkNATCfg;
148 /** The port we're attached to. */
149 PPDMINETWORKDOWN pIAboveNet;
150 /** The network config of the port we're attached to. */
151 PPDMINETWORKCONFIG pIAboveConfig;
152 /** Pointer to the driver instance. */
153 PPDMDRVINS pDrvIns;
154 /** Link state */
155 PDMNETWORKLINKSTATE enmLinkState;
156 /** NAT state for this instance. */
157 PNATState pNATState;
158 /** TFTP directory prefix. */
159 char *pszTFTPPrefix;
160 /** Boot file name to provide in the DHCP server response. */
161 char *pszBootFile;
162 /** tftp server name to provide in the DHCP server response. */
163 char *pszNextServer;
164 /** Polling thread. */
165 PPDMTHREAD pSlirpThread;
166 /** Queue for NAT-thread-external events. */
167 RTREQQUEUE hSlirpReqQueue;
168 /** The guest IP for port-forwarding. */
169 uint32_t GuestIP;
170 /** Link state set when the VM is suspended. */
171 PDMNETWORKLINKSTATE enmLinkStateWant;
172
173#ifndef RT_OS_WINDOWS
174 /** The write end of the control pipe. */
175 RTPIPE hPipeWrite;
176 /** The read end of the control pipe. */
177 RTPIPE hPipeRead;
178#else
179 /** for external notification */
180 HANDLE hWakeupEvent;
181#endif
182
183#define DRV_PROFILE_COUNTER(name, dsc) STAMPROFILE Stat ## name
184#define DRV_COUNTING_COUNTER(name, dsc) STAMCOUNTER Stat ## name
185#include "counters.h"
186 /** thread delivering packets for receiving by the guest */
187 PPDMTHREAD pRecvThread;
188 /** thread delivering urg packets for receiving by the guest */
189 PPDMTHREAD pUrgRecvThread;
190 /** event to wakeup the guest receive thread */
191 RTSEMEVENT EventRecv;
192 /** event to wakeup the guest urgent receive thread */
193 RTSEMEVENT EventUrgRecv;
194 /** Receive Req queue (deliver packets to the guest) */
195 RTREQQUEUE hRecvReqQueue;
196 /** Receive Urgent Req queue (deliver packets to the guest). */
197 RTREQQUEUE hUrgRecvReqQueue;
198
199 /** makes access to device func RecvAvail and Recv atomical. */
200 RTCRITSECT DevAccessLock;
201 /** Number of in-flight urgent packets. */
202 volatile uint32_t cUrgPkts;
203 /** Number of in-flight regular packets. */
204 volatile uint32_t cPkts;
205
206 /** Transmit lock taken by BeginXmit and released by EndXmit. */
207 RTCRITSECT XmitLock;
208
209#ifdef RT_OS_DARWIN
210 /* Handle of the DNS watcher runloop source. */
211 CFRunLoopSourceRef hRunLoopSrcDnsWatcher;
212#endif
213} DRVNAT;
214AssertCompileMemberAlignment(DRVNAT, StatNATRecvWakeups, 8);
215/** Pointer to the NAT driver instance data. */
216typedef DRVNAT *PDRVNAT;
217
218
219/*******************************************************************************
220* Internal Functions *
221*******************************************************************************/
222static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho);
223DECLINLINE(void) drvNATHostNetworkConfigurationChangeEventStrategySelector(
224 PDRVNAT pThis,
225 bool fHostNetworkConfigurationEventListener);
226static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis);
227
228
229static DECLCALLBACK(int) drvNATRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
230{
231 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
232
233 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
234 return VINF_SUCCESS;
235
236 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
237 {
238 RTReqQueueProcess(pThis->hRecvReqQueue, 0);
239 if (ASMAtomicReadU32(&pThis->cPkts) == 0)
240 RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
241 }
242 return VINF_SUCCESS;
243}
244
245
246static DECLCALLBACK(int) drvNATRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
247{
248 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
249 int rc;
250 rc = RTSemEventSignal(pThis->EventRecv);
251
252 STAM_COUNTER_INC(&pThis->StatNATRecvWakeups);
253 return VINF_SUCCESS;
254}
255
256static DECLCALLBACK(int) drvNATUrgRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
257{
258 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
259
260 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
261 return VINF_SUCCESS;
262
263 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
264 {
265 RTReqQueueProcess(pThis->hUrgRecvReqQueue, 0);
266 if (ASMAtomicReadU32(&pThis->cUrgPkts) == 0)
267 {
268 int rc = RTSemEventWait(pThis->EventUrgRecv, RT_INDEFINITE_WAIT);
269 AssertRC(rc);
270 }
271 }
272 return VINF_SUCCESS;
273}
274
275static DECLCALLBACK(int) drvNATUrgRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
276{
277 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
278 int rc = RTSemEventSignal(pThis->EventUrgRecv);
279 AssertRC(rc);
280
281 return VINF_SUCCESS;
282}
283
284static DECLCALLBACK(void) drvNATUrgRecvWorker(PDRVNAT pThis, uint8_t *pu8Buf, int cb, struct mbuf *m)
285{
286 int rc = RTCritSectEnter(&pThis->DevAccessLock);
287 AssertRC(rc);
288 rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
289 if (RT_SUCCESS(rc))
290 {
291 rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
292 AssertRC(rc);
293 }
294 else if ( rc != VERR_TIMEOUT
295 && rc != VERR_INTERRUPTED)
296 {
297 AssertRC(rc);
298 }
299
300 rc = RTCritSectLeave(&pThis->DevAccessLock);
301 AssertRC(rc);
302
303 slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
304 if (ASMAtomicDecU32(&pThis->cUrgPkts) == 0)
305 {
306 drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
307 drvNATNotifyNATThread(pThis, "drvNATUrgRecvWorker");
308 }
309}
310
311
312static DECLCALLBACK(void) drvNATRecvWorker(PDRVNAT pThis, uint8_t *pu8Buf, int cb, struct mbuf *m)
313{
314 int rc;
315 STAM_PROFILE_START(&pThis->StatNATRecv, a);
316
317
318 while (ASMAtomicReadU32(&pThis->cUrgPkts) != 0)
319 {
320 rc = RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
321 if ( RT_FAILURE(rc)
322 && ( rc == VERR_TIMEOUT
323 || rc == VERR_INTERRUPTED))
324 goto done_unlocked;
325 }
326
327 rc = RTCritSectEnter(&pThis->DevAccessLock);
328 AssertRC(rc);
329
330 STAM_PROFILE_START(&pThis->StatNATRecvWait, b);
331 rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
332 STAM_PROFILE_STOP(&pThis->StatNATRecvWait, b);
333
334 if (RT_SUCCESS(rc))
335 {
336 rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
337 AssertRC(rc);
338 }
339 else if ( rc != VERR_TIMEOUT
340 && rc != VERR_INTERRUPTED)
341 {
342 AssertRC(rc);
343 }
344
345 rc = RTCritSectLeave(&pThis->DevAccessLock);
346 AssertRC(rc);
347
348done_unlocked:
349 slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
350 ASMAtomicDecU32(&pThis->cPkts);
351
352 drvNATNotifyNATThread(pThis, "drvNATRecvWorker");
353
354 STAM_PROFILE_STOP(&pThis->StatNATRecv, a);
355}
356
357/**
358 * Frees a S/G buffer allocated by drvNATNetworkUp_AllocBuf.
359 *
360 * @param pThis Pointer to the NAT instance.
361 * @param pSgBuf The S/G buffer to free.
362 */
363static void drvNATFreeSgBuf(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
364{
365 Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_MAGIC_MASK) == PDMSCATTERGATHER_FLAGS_MAGIC);
366 pSgBuf->fFlags = 0;
367 if (pSgBuf->pvAllocator)
368 {
369 Assert(!pSgBuf->pvUser);
370 slirp_ext_m_free(pThis->pNATState, (struct mbuf *)pSgBuf->pvAllocator, NULL);
371 pSgBuf->pvAllocator = NULL;
372 }
373 else if (pSgBuf->pvUser)
374 {
375 RTMemFree(pSgBuf->aSegs[0].pvSeg);
376 pSgBuf->aSegs[0].pvSeg = NULL;
377 RTMemFree(pSgBuf->pvUser);
378 pSgBuf->pvUser = NULL;
379 }
380 RTMemFree(pSgBuf);
381}
382
383/**
384 * Worker function for drvNATSend().
385 *
386 * @param pThis Pointer to the NAT instance.
387 * @param pSgBuf The scatter/gather buffer.
388 * @thread NAT
389 */
390static void drvNATSendWorker(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
391{
392 Assert(pThis->enmLinkState == PDMNETWORKLINKSTATE_UP);
393 if (pThis->enmLinkState == PDMNETWORKLINKSTATE_UP)
394 {
395 struct mbuf *m = (struct mbuf *)pSgBuf->pvAllocator;
396 if (m)
397 {
398 /*
399 * A normal frame.
400 */
401 pSgBuf->pvAllocator = NULL;
402 slirp_input(pThis->pNATState, m, pSgBuf->cbUsed);
403 }
404 else
405 {
406 /*
407 * GSO frame, need to segment it.
408 */
409 /** @todo Make the NAT engine grok large frames? Could be more efficient... */
410#if 0 /* this is for testing PDMNetGsoCarveSegmentQD. */
411 uint8_t abHdrScratch[256];
412#endif
413 uint8_t const *pbFrame = (uint8_t const *)pSgBuf->aSegs[0].pvSeg;
414 PCPDMNETWORKGSO pGso = (PCPDMNETWORKGSO)pSgBuf->pvUser;
415 uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, pSgBuf->cbUsed); Assert(cSegs > 1);
416 for (size_t iSeg = 0; iSeg < cSegs; iSeg++)
417 {
418 size_t cbSeg;
419 void *pvSeg;
420 m = slirp_ext_m_get(pThis->pNATState, pGso->cbHdrsTotal + pGso->cbMaxSeg, &pvSeg, &cbSeg);
421 if (!m)
422 break;
423
424#if 1
425 uint32_t cbPayload, cbHdrs;
426 uint32_t offPayload = PDMNetGsoCarveSegment(pGso, pbFrame, pSgBuf->cbUsed,
427 iSeg, cSegs, (uint8_t *)pvSeg, &cbHdrs, &cbPayload);
428 memcpy((uint8_t *)pvSeg + cbHdrs, pbFrame + offPayload, cbPayload);
429
430 slirp_input(pThis->pNATState, m, cbPayload + cbHdrs);
431#else
432 uint32_t cbSegFrame;
433 void *pvSegFrame = PDMNetGsoCarveSegmentQD(pGso, (uint8_t *)pbFrame, pSgBuf->cbUsed, abHdrScratch,
434 iSeg, cSegs, &cbSegFrame);
435 memcpy((uint8_t *)pvSeg, pvSegFrame, cbSegFrame);
436
437 slirp_input(pThis->pNATState, m, cbSegFrame);
438#endif
439 }
440 }
441 }
442 drvNATFreeSgBuf(pThis, pSgBuf);
443
444 /** @todo Implement the VERR_TRY_AGAIN drvNATNetworkUp_AllocBuf semantics. */
445}
446
447/**
448 * @interface_method_impl{PDMINETWORKUP,pfnBeginXmit}
449 */
450static DECLCALLBACK(int) drvNATNetworkUp_BeginXmit(PPDMINETWORKUP pInterface, bool fOnWorkerThread)
451{
452 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
453 int rc = RTCritSectTryEnter(&pThis->XmitLock);
454 if (RT_FAILURE(rc))
455 {
456 /** @todo Kick the worker thread when we have one... */
457 rc = VERR_TRY_AGAIN;
458 }
459 return rc;
460}
461
462/**
463 * @interface_method_impl{PDMINETWORKUP,pfnAllocBuf}
464 */
465static DECLCALLBACK(int) drvNATNetworkUp_AllocBuf(PPDMINETWORKUP pInterface, size_t cbMin,
466 PCPDMNETWORKGSO pGso, PPPDMSCATTERGATHER ppSgBuf)
467{
468 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
469 Assert(RTCritSectIsOwner(&pThis->XmitLock));
470
471 /*
472 * Drop the incoming frame if the NAT thread isn't running.
473 */
474 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
475 {
476 Log(("drvNATNetowrkUp_AllocBuf: returns VERR_NET_NO_NETWORK\n"));
477 return VERR_NET_NO_NETWORK;
478 }
479
480 /*
481 * Allocate a scatter/gather buffer and an mbuf.
482 */
483 PPDMSCATTERGATHER pSgBuf = (PPDMSCATTERGATHER)RTMemAlloc(sizeof(*pSgBuf));
484 if (!pSgBuf)
485 return VERR_NO_MEMORY;
486 if (!pGso)
487 {
488 /*
489 * Drop the frame if it is too big.
490 */
491 if (cbMin >= DRVNAT_MAXFRAMESIZE)
492 {
493 Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
494 cbMin));
495 return VERR_INVALID_PARAMETER;
496 }
497
498 pSgBuf->pvUser = NULL;
499 pSgBuf->pvAllocator = slirp_ext_m_get(pThis->pNATState, cbMin,
500 &pSgBuf->aSegs[0].pvSeg, &pSgBuf->aSegs[0].cbSeg);
501 if (!pSgBuf->pvAllocator)
502 {
503 RTMemFree(pSgBuf);
504 return VERR_TRY_AGAIN;
505 }
506 }
507 else
508 {
509 /*
510 * Drop the frame if its segment is too big.
511 */
512 if (pGso->cbHdrsTotal + pGso->cbMaxSeg >= DRVNAT_MAXFRAMESIZE)
513 {
514 Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
515 pGso->cbHdrsTotal + pGso->cbMaxSeg));
516 return VERR_INVALID_PARAMETER;
517 }
518
519 pSgBuf->pvUser = RTMemDup(pGso, sizeof(*pGso));
520 pSgBuf->pvAllocator = NULL;
521 pSgBuf->aSegs[0].cbSeg = RT_ALIGN_Z(cbMin, 16);
522 pSgBuf->aSegs[0].pvSeg = RTMemAlloc(pSgBuf->aSegs[0].cbSeg);
523 if (!pSgBuf->pvUser || !pSgBuf->aSegs[0].pvSeg)
524 {
525 RTMemFree(pSgBuf->aSegs[0].pvSeg);
526 RTMemFree(pSgBuf->pvUser);
527 RTMemFree(pSgBuf);
528 return VERR_TRY_AGAIN;
529 }
530 }
531
532 /*
533 * Initialize the S/G buffer and return.
534 */
535 pSgBuf->fFlags = PDMSCATTERGATHER_FLAGS_MAGIC | PDMSCATTERGATHER_FLAGS_OWNER_1;
536 pSgBuf->cbUsed = 0;
537 pSgBuf->cbAvailable = pSgBuf->aSegs[0].cbSeg;
538 pSgBuf->cSegs = 1;
539
540#if 0 /* poison */
541 memset(pSgBuf->aSegs[0].pvSeg, 'F', pSgBuf->aSegs[0].cbSeg);
542#endif
543 *ppSgBuf = pSgBuf;
544 return VINF_SUCCESS;
545}
546
547/**
548 * @interface_method_impl{PDMINETWORKUP,pfnFreeBuf}
549 */
550static DECLCALLBACK(int) drvNATNetworkUp_FreeBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf)
551{
552 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
553 Assert(RTCritSectIsOwner(&pThis->XmitLock));
554 drvNATFreeSgBuf(pThis, pSgBuf);
555 return VINF_SUCCESS;
556}
557
558/**
559 * @interface_method_impl{PDMINETWORKUP,pfnSendBuf}
560 */
561static DECLCALLBACK(int) drvNATNetworkUp_SendBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf, bool fOnWorkerThread)
562{
563 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
564 Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_OWNER_MASK) == PDMSCATTERGATHER_FLAGS_OWNER_1);
565 Assert(RTCritSectIsOwner(&pThis->XmitLock));
566
567 int rc;
568 if (pThis->pSlirpThread->enmState == PDMTHREADSTATE_RUNNING)
569 {
570 /* Set an FTM checkpoint as this operation changes the state permanently. */
571 PDMDrvHlpFTSetCheckpoint(pThis->pDrvIns, FTMCHECKPOINTTYPE_NETWORK);
572
573
574 RTREQQUEUE hQueue = pThis->hSlirpReqQueue;
575
576 rc = RTReqQueueCallEx(hQueue, NULL /*ppReq*/, 0 /*cMillies*/, RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
577 (PFNRT)drvNATSendWorker, 2, pThis, pSgBuf);
578 if (RT_SUCCESS(rc))
579 {
580 drvNATNotifyNATThread(pThis, "drvNATNetworkUp_SendBuf");
581 return VINF_SUCCESS;
582 }
583
584 rc = VERR_NET_NO_BUFFER_SPACE;
585 }
586 else
587 rc = VERR_NET_DOWN;
588 drvNATFreeSgBuf(pThis, pSgBuf);
589 return rc;
590}
591
592/**
593 * @interface_method_impl{PDMINETWORKUP,pfnEndXmit}
594 */
595static DECLCALLBACK(void) drvNATNetworkUp_EndXmit(PPDMINETWORKUP pInterface)
596{
597 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
598 RTCritSectLeave(&pThis->XmitLock);
599}
600
601/**
602 * Get the NAT thread out of poll/WSAWaitForMultipleEvents
603 */
604static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho)
605{
606 int rc;
607#ifndef RT_OS_WINDOWS
608 /* kick poll() */
609 size_t cbIgnored;
610 rc = RTPipeWrite(pThis->hPipeWrite, "", 1, &cbIgnored);
611#else
612 /* kick WSAWaitForMultipleEvents */
613 rc = WSASetEvent(pThis->hWakeupEvent);
614#endif
615 AssertRC(rc);
616}
617
618/**
619 * @interface_method_impl{PDMINETWORKUP,pfnSetPromiscuousMode}
620 */
621static DECLCALLBACK(void) drvNATNetworkUp_SetPromiscuousMode(PPDMINETWORKUP pInterface, bool fPromiscuous)
622{
623 LogFlow(("drvNATNetworkUp_SetPromiscuousMode: fPromiscuous=%d\n", fPromiscuous));
624 /* nothing to do */
625}
626
627/**
628 * Worker function for drvNATNetworkUp_NotifyLinkChanged().
629 * @thread "NAT" thread.
630 */
631static void drvNATNotifyLinkChangedWorker(PDRVNAT pThis, PDMNETWORKLINKSTATE enmLinkState)
632{
633 pThis->enmLinkState = pThis->enmLinkStateWant = enmLinkState;
634 switch (enmLinkState)
635 {
636 case PDMNETWORKLINKSTATE_UP:
637 LogRel(("NAT: link up\n"));
638 slirp_link_up(pThis->pNATState);
639 break;
640
641 case PDMNETWORKLINKSTATE_DOWN:
642 case PDMNETWORKLINKSTATE_DOWN_RESUME:
643 LogRel(("NAT: link down\n"));
644 slirp_link_down(pThis->pNATState);
645 break;
646
647 default:
648 AssertMsgFailed(("drvNATNetworkUp_NotifyLinkChanged: unexpected link state %d\n", enmLinkState));
649 }
650}
651
652/**
653 * Notification on link status changes.
654 *
655 * @param pInterface Pointer to the interface structure containing the called function pointer.
656 * @param enmLinkState The new link state.
657 * @thread EMT
658 */
659static DECLCALLBACK(void) drvNATNetworkUp_NotifyLinkChanged(PPDMINETWORKUP pInterface, PDMNETWORKLINKSTATE enmLinkState)
660{
661 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
662
663 LogFlow(("drvNATNetworkUp_NotifyLinkChanged: enmLinkState=%d\n", enmLinkState));
664
665 /* Don't queue new requests when the NAT thread is about to stop.
666 * But the VM could also be paused. So memorize the desired state. */
667 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
668 {
669 pThis->enmLinkStateWant = enmLinkState;
670 return;
671 }
672
673 PRTREQ pReq;
674 int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /*cMillies*/, RTREQFLAGS_VOID,
675 (PFNRT)drvNATNotifyLinkChangedWorker, 2, pThis, enmLinkState);
676 if (RT_LIKELY(rc == VERR_TIMEOUT))
677 {
678 drvNATNotifyNATThread(pThis, "drvNATNetworkUp_NotifyLinkChanged");
679 rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
680 AssertRC(rc);
681 }
682 else
683 AssertRC(rc);
684 RTReqRelease(pReq);
685}
686
687static void drvNATNotifyApplyPortForwardCommand(PDRVNAT pThis, bool fRemove,
688 bool fUdp, const char *pHostIp,
689 uint16_t u16HostPort, const char *pGuestIp, uint16_t u16GuestPort)
690{
691 RTMAC Mac;
692 RT_ZERO(Mac); /* can't get MAC here */
693 if (pThis->pIAboveConfig)
694 pThis->pIAboveConfig->pfnGetMac(pThis->pIAboveConfig, &Mac);
695
696 struct in_addr guestIp, hostIp;
697
698 if ( pHostIp == NULL
699 || inet_aton(pHostIp, &hostIp) == 0)
700 hostIp.s_addr = INADDR_ANY;
701
702 if ( pGuestIp == NULL
703 || inet_aton(pGuestIp, &guestIp) == 0)
704 guestIp.s_addr = pThis->GuestIP;
705
706 if (fRemove)
707 slirp_remove_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
708 else
709 slirp_add_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort, Mac.au8);
710}
711
712DECLCALLBACK(int) drvNATNetworkNatConfig_RedirectRuleCommand(PPDMINETWORKNATCONFIG pInterface, bool fRemove,
713 bool fUdp, const char *pHostIp,
714 uint16_t u16HostPort, const char *pGuestIp, uint16_t u16GuestPort)
715{
716 LogFlowFunc(("fRemove=%d, fUdp=%d, pHostIp=%s, u16HostPort=%u, pGuestIp=%s, u16GuestPort=%u\n",
717 RT_BOOL(fRemove), RT_BOOL(fUdp), pHostIp, u16HostPort, pGuestIp,
718 u16GuestPort));
719 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
720 PRTREQ pReq;
721 int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /*cMillies*/, RTREQFLAGS_VOID,
722 (PFNRT)drvNATNotifyApplyPortForwardCommand, 7, pThis, fRemove,
723 fUdp, pHostIp, u16HostPort, pGuestIp, u16GuestPort);
724 if (RT_LIKELY(rc == VERR_TIMEOUT))
725 {
726 drvNATNotifyNATThread(pThis, "drvNATNetworkNatConfig_RedirectRuleCommand");
727 rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
728 AssertRC(rc);
729 }
730 else
731 AssertRC(rc);
732
733 RTReqRelease(pReq);
734 port_forwarding_done:
735 return rc;
736}
737
738/**
739 * NAT thread handling the slirp stuff.
740 *
741 * The slirp implementation is single-threaded so we execute this enginre in a
742 * dedicated thread. We take care that this thread does not become the
743 * bottleneck: If the guest wants to send, a request is enqueued into the
744 * hSlirpReqQueue and handled asynchronously by this thread. If this thread
745 * wants to deliver packets to the guest, it enqueues a request into
746 * hRecvReqQueue which is later handled by the Recv thread.
747 */
748static DECLCALLBACK(int) drvNATAsyncIoThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
749{
750 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
751 int nFDs = -1;
752#ifdef RT_OS_WINDOWS
753 HANDLE *phEvents = slirp_get_events(pThis->pNATState);
754 unsigned int cBreak = 0;
755#else /* RT_OS_WINDOWS */
756 unsigned int cPollNegRet = 0;
757#endif /* !RT_OS_WINDOWS */
758
759 LogFlow(("drvNATAsyncIoThread: pThis=%p\n", pThis));
760
761 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
762 return VINF_SUCCESS;
763
764 if (pThis->enmLinkStateWant != pThis->enmLinkState)
765 drvNATNotifyLinkChangedWorker(pThis, pThis->enmLinkStateWant);
766
767 /*
768 * Polling loop.
769 */
770 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
771 {
772 /*
773 * To prevent concurrent execution of sending/receiving threads
774 */
775#ifndef RT_OS_WINDOWS
776 nFDs = slirp_get_nsock(pThis->pNATState);
777 /* allocation for all sockets + Management pipe */
778 struct pollfd *polls = (struct pollfd *)RTMemAlloc((1 + nFDs) * sizeof(struct pollfd) + sizeof(uint32_t));
779 if (polls == NULL)
780 return VERR_NO_MEMORY;
781
782 /* don't pass the management pipe */
783 slirp_select_fill(pThis->pNATState, &nFDs, &polls[1]);
784
785 polls[0].fd = RTPipeToNative(pThis->hPipeRead);
786 /* POLLRDBAND usually doesn't used on Linux but seems used on Solaris */
787 polls[0].events = POLLRDNORM | POLLPRI | POLLRDBAND;
788 polls[0].revents = 0;
789
790 int cChangedFDs = poll(polls, nFDs + 1, slirp_get_timeout_ms(pThis->pNATState));
791 if (cChangedFDs < 0)
792 {
793 if (errno == EINTR)
794 {
795 Log2(("NAT: signal was caught while sleep on poll\n"));
796 /* No error, just process all outstanding requests but don't wait */
797 cChangedFDs = 0;
798 }
799 else if (cPollNegRet++ > 128)
800 {
801 LogRel(("NAT:Poll returns (%s) suppressed %d\n", strerror(errno), cPollNegRet));
802 cPollNegRet = 0;
803 }
804 }
805
806 if (cChangedFDs >= 0)
807 {
808 slirp_select_poll(pThis->pNATState, &polls[1], nFDs);
809 if (polls[0].revents & (POLLRDNORM|POLLPRI|POLLRDBAND))
810 {
811 /* drain the pipe
812 *
813 * Note! drvNATSend decoupled so we don't know how many times
814 * device's thread sends before we've entered multiplex,
815 * so to avoid false alarm drain pipe here to the very end
816 *
817 * @todo: Probably we should counter drvNATSend to count how
818 * deep pipe has been filed before drain.
819 *
820 */
821 /** @todo XXX: Make it reading exactly we need to drain the
822 * pipe.*/
823 char ch;
824 size_t cbRead;
825 RTPipeRead(pThis->hPipeRead, &ch, 1, &cbRead);
826 }
827 }
828 /* process _all_ outstanding requests but don't wait */
829 RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
830 RTMemFree(polls);
831
832#else /* RT_OS_WINDOWS */
833 nFDs = -1;
834 slirp_select_fill(pThis->pNATState, &nFDs);
835 DWORD dwEvent = WSAWaitForMultipleEvents(nFDs, phEvents, FALSE,
836 slirp_get_timeout_ms(pThis->pNATState),
837 FALSE);
838 if ( (dwEvent < WSA_WAIT_EVENT_0 || dwEvent > WSA_WAIT_EVENT_0 + nFDs - 1)
839 && dwEvent != WSA_WAIT_TIMEOUT)
840 {
841 int error = WSAGetLastError();
842 LogRel(("NAT: WSAWaitForMultipleEvents returned %d (error %d)\n", dwEvent, error));
843 RTAssertPanic();
844 }
845
846 if (dwEvent == WSA_WAIT_TIMEOUT)
847 {
848 /* only check for slow/fast timers */
849 slirp_select_poll(pThis->pNATState, /* fTimeout=*/true, /*fIcmp=*/false);
850 continue;
851 }
852 /* poll the sockets in any case */
853 Log2(("%s: poll\n", __FUNCTION__));
854 slirp_select_poll(pThis->pNATState, /* fTimeout=*/false, /* fIcmp=*/(dwEvent == WSA_WAIT_EVENT_0));
855 /* process _all_ outstanding requests but don't wait */
856 RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
857# ifdef VBOX_NAT_DELAY_HACK
858 if (cBreak++ > 128)
859 {
860 cBreak = 0;
861 RTThreadSleep(2);
862 }
863# endif
864#endif /* RT_OS_WINDOWS */
865 }
866
867 return VINF_SUCCESS;
868}
869
870
871/**
872 * Unblock the send thread so it can respond to a state change.
873 *
874 * @returns VBox status code.
875 * @param pDevIns The pcnet device instance.
876 * @param pThread The send thread.
877 */
878static DECLCALLBACK(int) drvNATAsyncIoWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
879{
880 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
881
882 drvNATNotifyNATThread(pThis, "drvNATAsyncIoWakeup");
883 return VINF_SUCCESS;
884}
885
886/**
887 * Function called by slirp to check if it's possible to feed incoming data to the network port.
888 * @returns 1 if possible.
889 * @returns 0 if not possible.
890 */
891int slirp_can_output(void *pvUser)
892{
893 return 1;
894}
895
896void slirp_push_recv_thread(void *pvUser)
897{
898 PDRVNAT pThis = (PDRVNAT)pvUser;
899 Assert(pThis);
900 drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
901}
902
903void slirp_urg_output(void *pvUser, struct mbuf *m, const uint8_t *pu8Buf, int cb)
904{
905 PDRVNAT pThis = (PDRVNAT)pvUser;
906 Assert(pThis);
907
908 PRTREQ pReq = NULL;
909
910 /* don't queue new requests when the NAT thread is about to stop */
911 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
912 return;
913
914 ASMAtomicIncU32(&pThis->cUrgPkts);
915 int rc = RTReqQueueCallEx(pThis->hUrgRecvReqQueue, NULL /*ppReq*/, 0 /*cMillies*/, RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
916 (PFNRT)drvNATUrgRecvWorker, 4, pThis, pu8Buf, cb, m);
917 AssertRC(rc);
918 drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
919}
920
921/**
922 * Function called by slirp to wake up device after VERR_TRY_AGAIN
923 */
924void slirp_output_pending(void *pvUser)
925{
926 PDRVNAT pThis = (PDRVNAT)pvUser;
927 Assert(pThis);
928 LogFlowFuncEnter();
929 pThis->pIAboveNet->pfnXmitPending(pThis->pIAboveNet);
930 LogFlowFuncLeave();
931}
932
933/**
934 * Function called by slirp to feed incoming data to the NIC.
935 */
936void slirp_output(void *pvUser, struct mbuf *m, const uint8_t *pu8Buf, int cb)
937{
938 PDRVNAT pThis = (PDRVNAT)pvUser;
939 Assert(pThis);
940
941 LogFlow(("slirp_output BEGIN %x %d\n", pu8Buf, cb));
942 Log2(("slirp_output: pu8Buf=%p cb=%#x (pThis=%p)\n%.*Rhxd\n", pu8Buf, cb, pThis, cb, pu8Buf));
943
944 PRTREQ pReq = NULL;
945
946 /* don't queue new requests when the NAT thread is about to stop */
947 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
948 return;
949
950 ASMAtomicIncU32(&pThis->cPkts);
951 int rc = RTReqQueueCallEx(pThis->hRecvReqQueue, NULL /*ppReq*/, 0 /*cMillies*/, RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
952 (PFNRT)drvNATRecvWorker, 4, pThis, pu8Buf, cb, m);
953 AssertRC(rc);
954 drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
955 STAM_COUNTER_INC(&pThis->StatQueuePktSent);
956 LogFlowFuncLeave();
957}
958
959
960#ifdef RT_OS_DARWIN
961/**
962 * Callback for the SystemConfiguration framework to notify us whenever the DNS
963 * server changes.
964 *
965 * @returns nothing.
966 * @param hDynStor The DynamicStore handle.
967 * @param hChangedKey Array of changed keys we watch for.
968 * @param pvUser Opaque user data (NAT driver instance).
969 */
970static DECLCALLBACK(void) drvNatDnsChanged(SCDynamicStoreRef hDynStor, CFArrayRef hChangedKeys, void *pvUser)
971{
972 PDRVNAT pThis = (PDRVNAT)pvUser;
973
974 LogRel(("NAT: DNS servers changed, triggering reconnect\n"));
975
976 CFDictionaryRef hDnsDict = (CFDictionaryRef)SCDynamicStoreCopyValue(hDynStor, CFSTR("State:/Network/Global/DNS"));
977 if (hDnsDict)
978 {
979 CFArrayRef hArrAddresses = (CFArrayRef)CFDictionaryGetValue(hDnsDict, kSCPropNetDNSServerAddresses);
980 if (hArrAddresses)
981 drvNATHostNetworkConfigurationChangeEventStrategySelector(pThis, /* RT_OS_DARWIN */ true);
982
983 CFRelease(hDnsDict);
984 }
985}
986#endif
987
988/**
989 * @interface_method_impl{PDMIBASE,pfnQueryInterface}
990 */
991static DECLCALLBACK(void *) drvNATQueryInterface(PPDMIBASE pInterface, const char *pszIID)
992{
993 PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
994 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
995
996 PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
997 PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKUP, &pThis->INetworkUp);
998 PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKNATCONFIG, &pThis->INetworkNATCfg);
999 return NULL;
1000}
1001
1002
1003/**
1004 * Get the MAC address into the slirp stack.
1005 *
1006 * Called by drvNATLoadDone and drvNATPowerOn.
1007 */
1008static void drvNATSetMac(PDRVNAT pThis)
1009{
1010 if (pThis->pIAboveConfig)
1011 {
1012 RTMAC Mac;
1013 pThis->pIAboveConfig->pfnGetMac(pThis->pIAboveConfig, &Mac);
1014 /* Re-activate the port forwarding. If */
1015 slirp_set_ethaddr_and_activate_port_forwarding(pThis->pNATState, Mac.au8, pThis->GuestIP);
1016 }
1017}
1018
1019
1020/**
1021 * After loading we have to pass the MAC address of the ethernet device to the slirp stack.
1022 * Otherwise the guest is not reachable until it performs a DHCP request or an ARP request
1023 * (usually done during guest boot).
1024 */
1025static DECLCALLBACK(int) drvNATLoadDone(PPDMDRVINS pDrvIns, PSSMHANDLE pSSMHandle)
1026{
1027 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1028 drvNATSetMac(pThis);
1029 return VINF_SUCCESS;
1030}
1031
1032
1033/**
1034 * Some guests might not use DHCP to retrieve an IP but use a static IP.
1035 */
1036static DECLCALLBACK(void) drvNATPowerOn(PPDMDRVINS pDrvIns)
1037{
1038 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1039 drvNATSetMac(pThis);
1040}
1041
1042
1043/**
1044 * @interface_method_impl{PDMDEVREG,pfnResume}
1045 */
1046static DECLCALLBACK(void) drvNATResume(PPDMDRVINS pDrvIns)
1047{
1048 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1049 VMRESUMEREASON enmReason = PDMDrvHlpVMGetResumeReason(pDrvIns);
1050
1051 switch (enmReason)
1052 {
1053 case VMRESUMEREASON_HOST_RESUME:
1054#if RT_OS_DARWIN
1055 drvNATHostNetworkConfigurationChangeEventStrategySelector(pThis, false);
1056#else
1057 drvNATHostNetworkConfigurationChangeEventStrategySelector(pThis, true);
1058#endif
1059 return;
1060 default: /* Ignore every other resume reason. */
1061 /* do nothing */
1062 return;
1063 }
1064}
1065
1066
1067static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis)
1068{
1069 slirpReleaseDnsSettings(pThis->pNATState);
1070 slirpInitializeDnsSettings(pThis->pNATState);
1071 return VINF_SUCCESS;
1072}
1073
1074/**
1075 * This function at this stage could be called from two places, but both from non-NAT thread,
1076 * - drvNATResume (EMT?)
1077 * - drvNatDnsChanged (darwin, GUI or main) "listener"
1078 * When Main's interface IHost will support host network configuration change event on every host,
1079 * we won't call it from drvNATResume, but from listener of Main event in the similar way it done
1080 * for port-forwarding, and it wan't be on GUI/main thread, but on EMT thread only.
1081 *
1082 * Thread here is important, because we need to change DNS server list and domain name (+ perhaps,
1083 * search string) at runtime (VBOX_NAT_ENFORCE_INTERNAL_DNS_UPDATE), we can do it safely on NAT thread,
1084 * so with changing other variables (place where we handle update) the main mechanism of update
1085 * _won't_ be changed, the only thing will change is drop of fHostNetworkConfigurationEventListener parameter.
1086 */
1087DECLINLINE(void) drvNATHostNetworkConfigurationChangeEventStrategySelector(PDRVNAT pThis,
1088 bool fHostNetworkConfigurationEventListener)
1089{
1090 int strategy = slirp_host_network_configuration_change_strategy_selector(pThis->pNATState);
1091 switch (strategy)
1092 {
1093
1094 case VBOX_NAT_HNCE_DNSPROXY:
1095 {
1096 /**
1097 * It's unsafe to to do it directly on non-NAT thread
1098 * so we schedule the worker and kick the NAT thread.
1099 */
1100 RTREQQUEUE hQueue = pThis->hSlirpReqQueue;
1101
1102 int rc = RTReqQueueCallEx(hQueue, NULL /*ppReq*/, 0 /*cMillies*/,
1103 RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
1104 (PFNRT)drvNATReinitializeHostNameResolving, 1, pThis);
1105 if (RT_SUCCESS(rc))
1106 drvNATNotifyNATThread(pThis,
1107 "drvNATHostNetworkConfigurationChangeEventStrategySelector");
1108
1109
1110 return;
1111
1112 }
1113 case VBOX_NAT_HNCE_EXSPOSED_NAME_RESOLUTION_INFO:
1114 /*
1115 * Host resumed from a suspend and the network might have changed.
1116 * Disconnect the guest from the network temporarily to let it pick up the changes.
1117 */
1118
1119 if (fHostNetworkConfigurationEventListener)
1120 pThis->pIAboveConfig->pfnSetLinkState(pThis->pIAboveConfig,
1121 PDMNETWORKLINKSTATE_DOWN_RESUME);
1122 return;
1123 case VBOX_NAT_HNCE_HOSTRESOLVER:
1124 default:
1125 return;
1126 }
1127}
1128
1129
1130/**
1131 * Info handler.
1132 */
1133static DECLCALLBACK(void) drvNATInfo(PPDMDRVINS pDrvIns, PCDBGFINFOHLP pHlp, const char *pszArgs)
1134{
1135 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1136 slirp_info(pThis->pNATState, pHlp, pszArgs);
1137}
1138
1139#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1140static int drvNATConstructDNSMappings(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pMappingsCfg)
1141{
1142 int rc = VINF_SUCCESS;
1143 LogFlowFunc(("ENTER: iInstance:%d\n", iInstance));
1144 for (PCFGMNODE pNode = CFGMR3GetFirstChild(pMappingsCfg); pNode; pNode = CFGMR3GetNextChild(pNode))
1145 {
1146 if (!CFGMR3AreValuesValid(pNode, "HostName\0HostNamePattern\0HostIP\0"))
1147 return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1148 N_("Unknown configuration in dns mapping"));
1149 char szHostNameOrPattern[255];
1150 bool fMatch = false; /* false used for equal matching, and true if wildcard pattern is used. */
1151 RT_ZERO(szHostNameOrPattern);
1152 GET_STRING(rc, pThis, pNode, "HostName", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1153 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1154 {
1155 GET_STRING(rc, pThis, pNode, "HostNamePattern", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1156 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1157 {
1158 char szNodeName[225];
1159 RT_ZERO(szNodeName);
1160 CFGMR3GetName(pNode, szNodeName, sizeof(szNodeName));
1161 LogRel(("NAT: Neither 'HostName' nor 'HostNamePattern' is specified for mapping %s\n", szNodeName));
1162 continue;
1163 }
1164 fMatch = true;
1165 }
1166 struct in_addr HostIP;
1167 GETIP_DEF(rc, pThis, pNode, HostIP, INADDR_ANY);
1168 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1169 {
1170 LogRel(("NAT: DNS mapping %s is ignored (address not pointed)\n", szHostNameOrPattern));
1171 continue;
1172 }
1173 slirp_add_host_resolver_mapping(pThis->pNATState, fMatch ? NULL : szHostNameOrPattern, fMatch ? szHostNameOrPattern : NULL, HostIP.s_addr);
1174 }
1175 LogFlowFunc(("LEAVE: %Rrc\n", rc));
1176 return rc;
1177}
1178#endif /* !VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER */
1179
1180
1181/**
1182 * Sets up the redirectors.
1183 *
1184 * @returns VBox status code.
1185 * @param pCfg The configuration handle.
1186 */
1187static int drvNATConstructRedir(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pCfg, PRTNETADDRIPV4 pNetwork)
1188{
1189 RTMAC Mac;
1190 RT_ZERO(Mac); /* can't get MAC here */
1191
1192 /*
1193 * Enumerate redirections.
1194 */
1195 for (PCFGMNODE pNode = CFGMR3GetFirstChild(pCfg); pNode; pNode = CFGMR3GetNextChild(pNode))
1196 {
1197#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1198 char szNodeName[32];
1199 CFGMR3GetName(pNode, szNodeName, 32);
1200 if ( !RTStrICmp(szNodeName, "HostResolverMappings")
1201 || !RTStrICmp(szNodeName, "AttachedDriver"))
1202 continue;
1203#endif
1204 /*
1205 * Validate the port forwarding config.
1206 */
1207 if (!CFGMR3AreValuesValid(pNode, "Protocol\0UDP\0HostPort\0GuestPort\0GuestIP\0BindIP\0"))
1208 return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1209 N_("Unknown configuration in port forwarding"));
1210
1211 /* protocol type */
1212 bool fUDP;
1213 char szProtocol[32];
1214 int rc;
1215 GET_STRING(rc, pThis, pNode, "Protocol", szProtocol[0], sizeof(szProtocol));
1216 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1217 {
1218 fUDP = false;
1219 GET_BOOL(rc, pThis, pNode, "UDP", fUDP);
1220 }
1221 else if (RT_SUCCESS(rc))
1222 {
1223 if (!RTStrICmp(szProtocol, "TCP"))
1224 fUDP = false;
1225 else if (!RTStrICmp(szProtocol, "UDP"))
1226 fUDP = true;
1227 else
1228 return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
1229 N_("NAT#%d: Invalid configuration value for \"Protocol\": \"%s\""),
1230 iInstance, szProtocol);
1231 }
1232 else
1233 return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS,
1234 N_("NAT#%d: configuration query for \"Protocol\" failed"),
1235 iInstance);
1236 /* host port */
1237 int32_t iHostPort;
1238 GET_S32_STRICT(rc, pThis, pNode, "HostPort", iHostPort);
1239
1240 /* guest port */
1241 int32_t iGuestPort;
1242 GET_S32_STRICT(rc, pThis, pNode, "GuestPort", iGuestPort);
1243
1244 /* guest address */
1245 struct in_addr GuestIP;
1246 GETIP_DEF(rc, pThis, pNode, GuestIP, RT_H2N_U32(pNetwork->u | CTL_GUEST));
1247
1248 /* Store the guest IP for re-establishing the port-forwarding rules. Note that GuestIP
1249 * is not documented. Without */
1250 if (pThis->GuestIP == INADDR_ANY)
1251 pThis->GuestIP = GuestIP.s_addr;
1252
1253 /*
1254 * Call slirp about it.
1255 */
1256 struct in_addr BindIP;
1257 GETIP_DEF(rc, pThis, pNode, BindIP, INADDR_ANY);
1258 if (slirp_add_redirect(pThis->pNATState, fUDP, BindIP, iHostPort, GuestIP, iGuestPort, Mac.au8) < 0)
1259 return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_SETUP, RT_SRC_POS,
1260 N_("NAT#%d: configuration error: failed to set up "
1261 "redirection of %d to %d. Probably a conflict with "
1262 "existing services or other rules"), iInstance, iHostPort,
1263 iGuestPort);
1264 } /* for each redir rule */
1265
1266 return VINF_SUCCESS;
1267}
1268
1269
1270/**
1271 * Destruct a driver instance.
1272 *
1273 * Most VM resources are freed by the VM. This callback is provided so that any non-VM
1274 * resources can be freed correctly.
1275 *
1276 * @param pDrvIns The driver instance data.
1277 */
1278static DECLCALLBACK(void) drvNATDestruct(PPDMDRVINS pDrvIns)
1279{
1280 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1281 LogFlow(("drvNATDestruct:\n"));
1282 PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
1283
1284 if (pThis->pNATState)
1285 {
1286 slirp_term(pThis->pNATState);
1287 slirp_deregister_statistics(pThis->pNATState, pDrvIns);
1288#ifdef VBOX_WITH_STATISTICS
1289# define DRV_PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1290# define DRV_COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1291# include "counters.h"
1292#endif
1293 pThis->pNATState = NULL;
1294 }
1295
1296 RTReqQueueDestroy(pThis->hSlirpReqQueue);
1297 pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1298
1299 RTReqQueueDestroy(pThis->hUrgRecvReqQueue);
1300 pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1301
1302 RTSemEventDestroy(pThis->EventRecv);
1303 pThis->EventRecv = NIL_RTSEMEVENT;
1304
1305 RTSemEventDestroy(pThis->EventUrgRecv);
1306 pThis->EventUrgRecv = NIL_RTSEMEVENT;
1307
1308 if (RTCritSectIsInitialized(&pThis->DevAccessLock))
1309 RTCritSectDelete(&pThis->DevAccessLock);
1310
1311 if (RTCritSectIsInitialized(&pThis->XmitLock))
1312 RTCritSectDelete(&pThis->XmitLock);
1313
1314#ifdef RT_OS_DARWIN
1315 /* Cleanup the DNS watcher. */
1316 CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1317 CFRetain(hRunLoopMain);
1318 CFRunLoopRemoveSource(hRunLoopMain, pThis->hRunLoopSrcDnsWatcher, kCFRunLoopCommonModes);
1319 CFRelease(hRunLoopMain);
1320 CFRelease(pThis->hRunLoopSrcDnsWatcher);
1321 pThis->hRunLoopSrcDnsWatcher = NULL;
1322#endif
1323}
1324
1325
1326/**
1327 * Construct a NAT network transport driver instance.
1328 *
1329 * @copydoc FNPDMDRVCONSTRUCT
1330 */
1331static DECLCALLBACK(int) drvNATConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
1332{
1333 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1334 LogFlow(("drvNATConstruct:\n"));
1335 PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
1336
1337 /*
1338 * Init the static parts.
1339 */
1340 pThis->pDrvIns = pDrvIns;
1341 pThis->pNATState = NULL;
1342 pThis->pszTFTPPrefix = NULL;
1343 pThis->pszBootFile = NULL;
1344 pThis->pszNextServer = NULL;
1345 pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1346 pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1347 pThis->EventRecv = NIL_RTSEMEVENT;
1348 pThis->EventUrgRecv = NIL_RTSEMEVENT;
1349#ifdef RT_OS_DARWIN
1350 pThis->hRunLoopSrcDnsWatcher = NULL;
1351#endif
1352
1353 /* IBase */
1354 pDrvIns->IBase.pfnQueryInterface = drvNATQueryInterface;
1355
1356 /* INetwork */
1357 pThis->INetworkUp.pfnBeginXmit = drvNATNetworkUp_BeginXmit;
1358 pThis->INetworkUp.pfnAllocBuf = drvNATNetworkUp_AllocBuf;
1359 pThis->INetworkUp.pfnFreeBuf = drvNATNetworkUp_FreeBuf;
1360 pThis->INetworkUp.pfnSendBuf = drvNATNetworkUp_SendBuf;
1361 pThis->INetworkUp.pfnEndXmit = drvNATNetworkUp_EndXmit;
1362 pThis->INetworkUp.pfnSetPromiscuousMode = drvNATNetworkUp_SetPromiscuousMode;
1363 pThis->INetworkUp.pfnNotifyLinkChanged = drvNATNetworkUp_NotifyLinkChanged;
1364
1365 /* NAT engine configuration */
1366 pThis->INetworkNATCfg.pfnRedirectRuleCommand = drvNATNetworkNatConfig_RedirectRuleCommand;
1367
1368 /*
1369 * Validate the config.
1370 */
1371 if (!CFGMR3AreValuesValid(pCfg,
1372 "PassDomain\0TFTPPrefix\0BootFile\0Network"
1373 "\0NextServer\0DNSProxy\0BindIP\0UseHostResolver\0"
1374 "SlirpMTU\0AliasMode\0"
1375 "SockRcv\0SockSnd\0TcpRcv\0TcpSnd\0"
1376 "ICMPCacheLimit\0"
1377 "SoMaxConnection\0"
1378#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1379 "HostResolverMappings\0"
1380#endif
1381 ))
1382 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1383 N_("Unknown NAT configuration option, only supports PassDomain,"
1384 " TFTPPrefix, BootFile and Network"));
1385
1386 /*
1387 * Get the configuration settings.
1388 */
1389 int rc;
1390 bool fPassDomain = true;
1391 GET_BOOL(rc, pThis, pCfg, "PassDomain", fPassDomain);
1392
1393 GET_STRING_ALLOC(rc, pThis, pCfg, "TFTPPrefix", pThis->pszTFTPPrefix);
1394 GET_STRING_ALLOC(rc, pThis, pCfg, "BootFile", pThis->pszBootFile);
1395 GET_STRING_ALLOC(rc, pThis, pCfg, "NextServer", pThis->pszNextServer);
1396
1397 int fDNSProxy = 0;
1398 GET_S32(rc, pThis, pCfg, "DNSProxy", fDNSProxy);
1399 int fUseHostResolver = 0;
1400 GET_S32(rc, pThis, pCfg, "UseHostResolver", fUseHostResolver);
1401 int MTU = 1500;
1402 GET_S32(rc, pThis, pCfg, "SlirpMTU", MTU);
1403 int i32AliasMode = 0;
1404 int i32MainAliasMode = 0;
1405 GET_S32(rc, pThis, pCfg, "AliasMode", i32MainAliasMode);
1406 int iIcmpCacheLimit = 100;
1407 GET_S32(rc, pThis, pCfg, "ICMPCacheLimit", iIcmpCacheLimit);
1408
1409 i32AliasMode |= (i32MainAliasMode & 0x1 ? 0x1 : 0);
1410 i32AliasMode |= (i32MainAliasMode & 0x2 ? 0x40 : 0);
1411 i32AliasMode |= (i32MainAliasMode & 0x4 ? 0x4 : 0);
1412 int i32SoMaxConn = 10;
1413 GET_S32(rc, pThis, pCfg, "SoMaxConnection", i32SoMaxConn);
1414 /*
1415 * Query the network port interface.
1416 */
1417 pThis->pIAboveNet = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKDOWN);
1418 if (!pThis->pIAboveNet)
1419 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1420 N_("Configuration error: the above device/driver didn't "
1421 "export the network port interface"));
1422 pThis->pIAboveConfig = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKCONFIG);
1423 if (!pThis->pIAboveConfig)
1424 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1425 N_("Configuration error: the above device/driver didn't "
1426 "export the network config interface"));
1427
1428 /* Generate a network address for this network card. */
1429 char szNetwork[32]; /* xxx.xxx.xxx.xxx/yy */
1430 GET_STRING(rc, pThis, pCfg, "Network", szNetwork[0], sizeof(szNetwork));
1431 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1432 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT%d: Configuration error: "
1433 "missing network"),
1434 pDrvIns->iInstance, szNetwork);
1435
1436 RTNETADDRIPV4 Network, Netmask;
1437
1438 rc = RTCidrStrToIPv4(szNetwork, &Network, &Netmask);
1439 if (RT_FAILURE(rc))
1440 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: Configuration error: "
1441 "network '%s' describes not a valid IPv4 network"),
1442 pDrvIns->iInstance, szNetwork);
1443
1444 /*
1445 * Initialize slirp.
1446 */
1447 rc = slirp_init(&pThis->pNATState, RT_H2N_U32(Network.u), Netmask.u,
1448 fPassDomain, !!fUseHostResolver, i32AliasMode,
1449 iIcmpCacheLimit, pThis);
1450 if (RT_SUCCESS(rc))
1451 {
1452 slirp_set_dhcp_TFTP_prefix(pThis->pNATState, pThis->pszTFTPPrefix);
1453 slirp_set_dhcp_TFTP_bootfile(pThis->pNATState, pThis->pszBootFile);
1454 slirp_set_dhcp_next_server(pThis->pNATState, pThis->pszNextServer);
1455 slirp_set_dhcp_dns_proxy(pThis->pNATState, !!fDNSProxy);
1456 slirp_set_mtu(pThis->pNATState, MTU);
1457 slirp_set_somaxconn(pThis->pNATState, i32SoMaxConn);
1458 char *pszBindIP = NULL;
1459 GET_STRING_ALLOC(rc, pThis, pCfg, "BindIP", pszBindIP);
1460 rc = slirp_set_binding_address(pThis->pNATState, pszBindIP);
1461 if (rc != 0 && pszBindIP && *pszBindIP)
1462 LogRel(("NAT: value of BindIP has been ignored\n"));
1463
1464 if(pszBindIP != NULL)
1465 MMR3HeapFree(pszBindIP);
1466#define SLIRP_SET_TUNING_VALUE(name, setter) \
1467 do \
1468 { \
1469 int len = 0; \
1470 rc = CFGMR3QueryS32(pCfg, name, &len); \
1471 if (RT_SUCCESS(rc)) \
1472 setter(pThis->pNATState, len); \
1473 } while(0)
1474
1475 SLIRP_SET_TUNING_VALUE("SockRcv", slirp_set_rcvbuf);
1476 SLIRP_SET_TUNING_VALUE("SockSnd", slirp_set_sndbuf);
1477 SLIRP_SET_TUNING_VALUE("TcpRcv", slirp_set_tcp_rcvspace);
1478 SLIRP_SET_TUNING_VALUE("TcpSnd", slirp_set_tcp_sndspace);
1479
1480 slirp_register_statistics(pThis->pNATState, pDrvIns);
1481#ifdef VBOX_WITH_STATISTICS
1482# define DRV_PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
1483# define DRV_COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
1484# include "counters.h"
1485#endif
1486
1487#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1488 PCFGMNODE pMappingsCfg = CFGMR3GetChild(pCfg, "HostResolverMappings");
1489
1490 if (pMappingsCfg)
1491 {
1492 rc = drvNATConstructDNSMappings(pDrvIns->iInstance, pThis, pMappingsCfg);
1493 AssertRC(rc);
1494 }
1495#endif
1496 rc = drvNATConstructRedir(pDrvIns->iInstance, pThis, pCfg, &Network);
1497 if (RT_SUCCESS(rc))
1498 {
1499 /*
1500 * Register a load done notification to get the MAC address into the slirp
1501 * engine after we loaded a guest state.
1502 */
1503 rc = PDMDrvHlpSSMRegisterLoadDone(pDrvIns, drvNATLoadDone);
1504 AssertLogRelRCReturn(rc, rc);
1505
1506 rc = RTReqQueueCreate(&pThis->hSlirpReqQueue);
1507 AssertLogRelRCReturn(rc, rc);
1508
1509 rc = RTReqQueueCreate(&pThis->hRecvReqQueue);
1510 AssertLogRelRCReturn(rc, rc);
1511
1512 rc = RTReqQueueCreate(&pThis->hUrgRecvReqQueue);
1513 AssertLogRelRCReturn(rc, rc);
1514
1515 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pRecvThread, pThis, drvNATRecv,
1516 drvNATRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATRX");
1517 AssertRCReturn(rc, rc);
1518
1519 rc = RTSemEventCreate(&pThis->EventRecv);
1520 AssertRCReturn(rc, rc);
1521
1522 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pUrgRecvThread, pThis, drvNATUrgRecv,
1523 drvNATUrgRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATURGRX");
1524 AssertRCReturn(rc, rc);
1525
1526 rc = RTSemEventCreate(&pThis->EventRecv);
1527 AssertRCReturn(rc, rc);
1528
1529 rc = RTSemEventCreate(&pThis->EventUrgRecv);
1530 AssertRCReturn(rc, rc);
1531
1532 rc = RTCritSectInit(&pThis->DevAccessLock);
1533 AssertRCReturn(rc, rc);
1534
1535 rc = RTCritSectInit(&pThis->XmitLock);
1536 AssertRCReturn(rc, rc);
1537
1538 char szTmp[128];
1539 RTStrPrintf(szTmp, sizeof(szTmp), "nat%d", pDrvIns->iInstance);
1540 PDMDrvHlpDBGFInfoRegister(pDrvIns, szTmp, "NAT info.", drvNATInfo);
1541
1542#ifndef RT_OS_WINDOWS
1543 /*
1544 * Create the control pipe.
1545 */
1546 rc = RTPipeCreate(&pThis->hPipeRead, &pThis->hPipeWrite, 0 /*fFlags*/);
1547 AssertRCReturn(rc, rc);
1548#else
1549 pThis->hWakeupEvent = CreateEvent(NULL, FALSE, FALSE, NULL); /* auto-reset event */
1550 slirp_register_external_event(pThis->pNATState, pThis->hWakeupEvent,
1551 VBOX_WAKEUP_EVENT_INDEX);
1552#endif
1553
1554 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pSlirpThread, pThis, drvNATAsyncIoThread,
1555 drvNATAsyncIoWakeup, 128 * _1K, RTTHREADTYPE_IO, "NAT");
1556 AssertRCReturn(rc, rc);
1557
1558 pThis->enmLinkState = pThis->enmLinkStateWant = PDMNETWORKLINKSTATE_UP;
1559
1560#ifdef RT_OS_DARWIN
1561 /* Set up a watcher which notifies us everytime the DNS server changes. */
1562 int rc2 = VINF_SUCCESS;
1563 SCDynamicStoreContext SCDynStorCtx;
1564
1565 SCDynStorCtx.version = 0;
1566 SCDynStorCtx.info = pThis;
1567 SCDynStorCtx.retain = NULL;
1568 SCDynStorCtx.release = NULL;
1569 SCDynStorCtx.copyDescription = NULL;
1570
1571 SCDynamicStoreRef hDynStor = SCDynamicStoreCreate(NULL, CFSTR("org.virtualbox.drvnat"), drvNatDnsChanged, &SCDynStorCtx);
1572 if (hDynStor)
1573 {
1574 CFRunLoopSourceRef hRunLoopSrc = SCDynamicStoreCreateRunLoopSource(NULL, hDynStor, 0);
1575 if (hRunLoopSrc)
1576 {
1577 CFStringRef aWatchKeys[] =
1578 {
1579 CFSTR("State:/Network/Global/DNS")
1580 };
1581 CFArrayRef hArray = CFArrayCreate(NULL, (const void **)aWatchKeys, 1, &kCFTypeArrayCallBacks);
1582
1583 if (hArray)
1584 {
1585 if (SCDynamicStoreSetNotificationKeys(hDynStor, hArray, NULL))
1586 {
1587 CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1588 CFRetain(hRunLoopMain);
1589 CFRunLoopAddSource(hRunLoopMain, hRunLoopSrc, kCFRunLoopCommonModes);
1590 CFRelease(hRunLoopMain);
1591 pThis->hRunLoopSrcDnsWatcher = hRunLoopSrc;
1592 }
1593 else
1594 rc2 = VERR_NO_MEMORY;
1595
1596 CFRelease(hArray);
1597 }
1598 else
1599 rc2 = VERR_NO_MEMORY;
1600
1601 if (RT_FAILURE(rc2)) /* Keep the runloop source referenced for destruction. */
1602 CFRelease(hRunLoopSrc);
1603 }
1604 CFRelease(hDynStor);
1605 }
1606 else
1607 rc2 = VERR_NO_MEMORY;
1608
1609 if (RT_FAILURE(rc2))
1610 LogRel(("NAT#%d: Failed to install DNS change notifier. The guest might loose DNS access when switching networks on the host\n",
1611 pDrvIns->iInstance));
1612#endif
1613
1614 /* might return VINF_NAT_DNS */
1615 return rc;
1616 }
1617
1618 /* failure path */
1619 slirp_term(pThis->pNATState);
1620 pThis->pNATState = NULL;
1621 }
1622 else
1623 {
1624 PDMDRV_SET_ERROR(pDrvIns, rc, N_("Unknown error during NAT networking setup: "));
1625 AssertMsgFailed(("Add error message for rc=%d (%Rrc)\n", rc, rc));
1626 }
1627
1628 return rc;
1629}
1630
1631
1632/**
1633 * NAT network transport driver registration record.
1634 */
1635const PDMDRVREG g_DrvNAT =
1636{
1637 /* u32Version */
1638 PDM_DRVREG_VERSION,
1639 /* szName */
1640 "NAT",
1641 /* szRCMod */
1642 "",
1643 /* szR0Mod */
1644 "",
1645 /* pszDescription */
1646 "NAT Network Transport Driver",
1647 /* fFlags */
1648 PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1649 /* fClass. */
1650 PDM_DRVREG_CLASS_NETWORK,
1651 /* cMaxInstances */
1652 ~0U,
1653 /* cbInstance */
1654 sizeof(DRVNAT),
1655 /* pfnConstruct */
1656 drvNATConstruct,
1657 /* pfnDestruct */
1658 drvNATDestruct,
1659 /* pfnRelocate */
1660 NULL,
1661 /* pfnIOCtl */
1662 NULL,
1663 /* pfnPowerOn */
1664 drvNATPowerOn,
1665 /* pfnReset */
1666 NULL,
1667 /* pfnSuspend */
1668 NULL,
1669 /* pfnResume */
1670 drvNATResume,
1671 /* pfnAttach */
1672 NULL,
1673 /* pfnDetach */
1674 NULL,
1675 /* pfnPowerOff */
1676 NULL,
1677 /* pfnSoftReset */
1678 NULL,
1679 /* u32EndVersion */
1680 PDM_DRVREG_VERSION
1681};
1682
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