VirtualBox

source: vbox/trunk/src/VBox/Devices/Network/DrvNAT.cpp@ 59747

Last change on this file since 59747 was 59312, checked in by vboxsync, 9 years ago

NAT: drvNATSendWorker - ifdef out assertion which condition we deal
with anyway (follow up to r98365).
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  • Property svn:keywords set to Author Date Id Revision
File size: 62.3 KB
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1/* $Id: DrvNAT.cpp 59312 2016-01-12 02:13:37Z vboxsync $ */
2/** @file
3 * DrvNAT - NAT network transport driver.
4 */
5
6/*
7 * Copyright (C) 2006-2015 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/*********************************************************************************************************************************
136* Structures and Typedefs *
137*********************************************************************************************************************************/
138/**
139 * NAT network transport driver instance data.
140 *
141 * @implements PDMINETWORKUP
142 */
143typedef struct DRVNAT
144{
145 /** The network interface. */
146 PDMINETWORKUP INetworkUp;
147 /** The network NAT Engine configureation. */
148 PDMINETWORKNATCONFIG INetworkNATCfg;
149 /** The port we're attached to. */
150 PPDMINETWORKDOWN pIAboveNet;
151 /** The network config of the port we're attached to. */
152 PPDMINETWORKCONFIG pIAboveConfig;
153 /** Pointer to the driver instance. */
154 PPDMDRVINS pDrvIns;
155 /** Link state */
156 PDMNETWORKLINKSTATE enmLinkState;
157 /** NAT state for this instance. */
158 PNATState pNATState;
159 /** TFTP directory prefix. */
160 char *pszTFTPPrefix;
161 /** Boot file name to provide in the DHCP server response. */
162 char *pszBootFile;
163 /** tftp server name to provide in the DHCP server response. */
164 char *pszNextServer;
165 /** Polling thread. */
166 PPDMTHREAD pSlirpThread;
167 /** Queue for NAT-thread-external events. */
168 RTREQQUEUE hSlirpReqQueue;
169 /** The guest IP for port-forwarding. */
170 uint32_t GuestIP;
171 /** Link state set when the VM is suspended. */
172 PDMNETWORKLINKSTATE enmLinkStateWant;
173
174#ifndef RT_OS_WINDOWS
175 /** The write end of the control pipe. */
176 RTPIPE hPipeWrite;
177 /** The read end of the control pipe. */
178 RTPIPE hPipeRead;
179# if HC_ARCH_BITS == 32
180 uint32_t u32Padding;
181# endif
182#else
183 /** for external notification */
184 HANDLE hWakeupEvent;
185#endif
186
187#define DRV_PROFILE_COUNTER(name, dsc) STAMPROFILE Stat ## name
188#define DRV_COUNTING_COUNTER(name, dsc) STAMCOUNTER Stat ## name
189#include "counters.h"
190 /** thread delivering packets for receiving by the guest */
191 PPDMTHREAD pRecvThread;
192 /** thread delivering urg packets for receiving by the guest */
193 PPDMTHREAD pUrgRecvThread;
194 /** event to wakeup the guest receive thread */
195 RTSEMEVENT EventRecv;
196 /** event to wakeup the guest urgent receive thread */
197 RTSEMEVENT EventUrgRecv;
198 /** Receive Req queue (deliver packets to the guest) */
199 RTREQQUEUE hRecvReqQueue;
200 /** Receive Urgent Req queue (deliver packets to the guest). */
201 RTREQQUEUE hUrgRecvReqQueue;
202
203 /** makes access to device func RecvAvail and Recv atomical. */
204 RTCRITSECT DevAccessLock;
205 /** Number of in-flight urgent packets. */
206 volatile uint32_t cUrgPkts;
207 /** Number of in-flight regular packets. */
208 volatile uint32_t cPkts;
209
210 /** Transmit lock taken by BeginXmit and released by EndXmit. */
211 RTCRITSECT XmitLock;
212
213#ifdef RT_OS_DARWIN
214 /* Handle of the DNS watcher runloop source. */
215 CFRunLoopSourceRef hRunLoopSrcDnsWatcher;
216#endif
217} DRVNAT;
218AssertCompileMemberAlignment(DRVNAT, StatNATRecvWakeups, 8);
219/** Pointer to the NAT driver instance data. */
220typedef DRVNAT *PDRVNAT;
221
222
223/*********************************************************************************************************************************
224* Internal Functions *
225*********************************************************************************************************************************/
226static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho);
227DECLINLINE(void) drvNATUpdateDNS(PDRVNAT pThis, bool fFlapLink);
228static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis);
229
230
231static DECLCALLBACK(int) drvNATRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
232{
233 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
234
235 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
236 return VINF_SUCCESS;
237
238 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
239 {
240 RTReqQueueProcess(pThis->hRecvReqQueue, 0);
241 if (ASMAtomicReadU32(&pThis->cPkts) == 0)
242 RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
243 }
244 return VINF_SUCCESS;
245}
246
247
248static DECLCALLBACK(int) drvNATRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
249{
250 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
251 int rc;
252 rc = RTSemEventSignal(pThis->EventRecv);
253
254 STAM_COUNTER_INC(&pThis->StatNATRecvWakeups);
255 return VINF_SUCCESS;
256}
257
258static DECLCALLBACK(int) drvNATUrgRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
259{
260 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
261
262 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
263 return VINF_SUCCESS;
264
265 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
266 {
267 RTReqQueueProcess(pThis->hUrgRecvReqQueue, 0);
268 if (ASMAtomicReadU32(&pThis->cUrgPkts) == 0)
269 {
270 int rc = RTSemEventWait(pThis->EventUrgRecv, RT_INDEFINITE_WAIT);
271 AssertRC(rc);
272 }
273 }
274 return VINF_SUCCESS;
275}
276
277static DECLCALLBACK(int) drvNATUrgRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
278{
279 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
280 int rc = RTSemEventSignal(pThis->EventUrgRecv);
281 AssertRC(rc);
282
283 return VINF_SUCCESS;
284}
285
286static DECLCALLBACK(void) drvNATUrgRecvWorker(PDRVNAT pThis, uint8_t *pu8Buf, int cb, struct mbuf *m)
287{
288 int rc = RTCritSectEnter(&pThis->DevAccessLock);
289 AssertRC(rc);
290 rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
291 if (RT_SUCCESS(rc))
292 {
293 rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
294 AssertRC(rc);
295 }
296 else if ( rc != VERR_TIMEOUT
297 && rc != VERR_INTERRUPTED)
298 {
299 AssertRC(rc);
300 }
301
302 rc = RTCritSectLeave(&pThis->DevAccessLock);
303 AssertRC(rc);
304
305 slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
306 if (ASMAtomicDecU32(&pThis->cUrgPkts) == 0)
307 {
308 drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
309 drvNATNotifyNATThread(pThis, "drvNATUrgRecvWorker");
310 }
311}
312
313
314static DECLCALLBACK(void) drvNATRecvWorker(PDRVNAT pThis, uint8_t *pu8Buf, int cb, struct mbuf *m)
315{
316 int rc;
317 STAM_PROFILE_START(&pThis->StatNATRecv, a);
318
319
320 while (ASMAtomicReadU32(&pThis->cUrgPkts) != 0)
321 {
322 rc = RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
323 if ( RT_FAILURE(rc)
324 && ( rc == VERR_TIMEOUT
325 || rc == VERR_INTERRUPTED))
326 goto done_unlocked;
327 }
328
329 rc = RTCritSectEnter(&pThis->DevAccessLock);
330 AssertRC(rc);
331
332 STAM_PROFILE_START(&pThis->StatNATRecvWait, b);
333 rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
334 STAM_PROFILE_STOP(&pThis->StatNATRecvWait, b);
335
336 if (RT_SUCCESS(rc))
337 {
338 rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
339 AssertRC(rc);
340 }
341 else if ( rc != VERR_TIMEOUT
342 && rc != VERR_INTERRUPTED)
343 {
344 AssertRC(rc);
345 }
346
347 rc = RTCritSectLeave(&pThis->DevAccessLock);
348 AssertRC(rc);
349
350done_unlocked:
351 slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
352 ASMAtomicDecU32(&pThis->cPkts);
353
354 drvNATNotifyNATThread(pThis, "drvNATRecvWorker");
355
356 STAM_PROFILE_STOP(&pThis->StatNATRecv, a);
357}
358
359/**
360 * Frees a S/G buffer allocated by drvNATNetworkUp_AllocBuf.
361 *
362 * @param pThis Pointer to the NAT instance.
363 * @param pSgBuf The S/G buffer to free.
364 */
365static void drvNATFreeSgBuf(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
366{
367 Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_MAGIC_MASK) == PDMSCATTERGATHER_FLAGS_MAGIC);
368 pSgBuf->fFlags = 0;
369 if (pSgBuf->pvAllocator)
370 {
371 Assert(!pSgBuf->pvUser);
372 slirp_ext_m_free(pThis->pNATState, (struct mbuf *)pSgBuf->pvAllocator, NULL);
373 pSgBuf->pvAllocator = NULL;
374 }
375 else if (pSgBuf->pvUser)
376 {
377 RTMemFree(pSgBuf->aSegs[0].pvSeg);
378 pSgBuf->aSegs[0].pvSeg = NULL;
379 RTMemFree(pSgBuf->pvUser);
380 pSgBuf->pvUser = NULL;
381 }
382 RTMemFree(pSgBuf);
383}
384
385/**
386 * Worker function for drvNATSend().
387 *
388 * @param pThis Pointer to the NAT instance.
389 * @param pSgBuf The scatter/gather buffer.
390 * @thread NAT
391 */
392static void drvNATSendWorker(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
393{
394#if 0 /* Assertion happens often to me after resuming a VM -- no time to investigate this now. */
395 Assert(pThis->enmLinkState == PDMNETWORKLINKSTATE_UP);
396#endif
397 if (pThis->enmLinkState == PDMNETWORKLINKSTATE_UP)
398 {
399 struct mbuf *m = (struct mbuf *)pSgBuf->pvAllocator;
400 if (m)
401 {
402 /*
403 * A normal frame.
404 */
405 pSgBuf->pvAllocator = NULL;
406 slirp_input(pThis->pNATState, m, pSgBuf->cbUsed);
407 }
408 else
409 {
410 /*
411 * GSO frame, need to segment it.
412 */
413 /** @todo Make the NAT engine grok large frames? Could be more efficient... */
414#if 0 /* this is for testing PDMNetGsoCarveSegmentQD. */
415 uint8_t abHdrScratch[256];
416#endif
417 uint8_t const *pbFrame = (uint8_t const *)pSgBuf->aSegs[0].pvSeg;
418 PCPDMNETWORKGSO pGso = (PCPDMNETWORKGSO)pSgBuf->pvUser;
419 uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, pSgBuf->cbUsed); Assert(cSegs > 1);
420 for (size_t iSeg = 0; iSeg < cSegs; iSeg++)
421 {
422 size_t cbSeg;
423 void *pvSeg;
424 m = slirp_ext_m_get(pThis->pNATState, pGso->cbHdrsTotal + pGso->cbMaxSeg, &pvSeg, &cbSeg);
425 if (!m)
426 break;
427
428#if 1
429 uint32_t cbPayload, cbHdrs;
430 uint32_t offPayload = PDMNetGsoCarveSegment(pGso, pbFrame, pSgBuf->cbUsed,
431 iSeg, cSegs, (uint8_t *)pvSeg, &cbHdrs, &cbPayload);
432 memcpy((uint8_t *)pvSeg + cbHdrs, pbFrame + offPayload, cbPayload);
433
434 slirp_input(pThis->pNATState, m, cbPayload + cbHdrs);
435#else
436 uint32_t cbSegFrame;
437 void *pvSegFrame = PDMNetGsoCarveSegmentQD(pGso, (uint8_t *)pbFrame, pSgBuf->cbUsed, abHdrScratch,
438 iSeg, cSegs, &cbSegFrame);
439 memcpy((uint8_t *)pvSeg, pvSegFrame, cbSegFrame);
440
441 slirp_input(pThis->pNATState, m, cbSegFrame);
442#endif
443 }
444 }
445 }
446 drvNATFreeSgBuf(pThis, pSgBuf);
447
448 /** @todo Implement the VERR_TRY_AGAIN drvNATNetworkUp_AllocBuf semantics. */
449}
450
451/**
452 * @interface_method_impl{PDMINETWORKUP,pfnBeginXmit}
453 */
454static DECLCALLBACK(int) drvNATNetworkUp_BeginXmit(PPDMINETWORKUP pInterface, bool fOnWorkerThread)
455{
456 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
457 int rc = RTCritSectTryEnter(&pThis->XmitLock);
458 if (RT_FAILURE(rc))
459 {
460 /** @todo Kick the worker thread when we have one... */
461 rc = VERR_TRY_AGAIN;
462 }
463 return rc;
464}
465
466/**
467 * @interface_method_impl{PDMINETWORKUP,pfnAllocBuf}
468 */
469static DECLCALLBACK(int) drvNATNetworkUp_AllocBuf(PPDMINETWORKUP pInterface, size_t cbMin,
470 PCPDMNETWORKGSO pGso, PPPDMSCATTERGATHER ppSgBuf)
471{
472 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
473 Assert(RTCritSectIsOwner(&pThis->XmitLock));
474
475 /*
476 * Drop the incoming frame if the NAT thread isn't running.
477 */
478 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
479 {
480 Log(("drvNATNetowrkUp_AllocBuf: returns VERR_NET_NO_NETWORK\n"));
481 return VERR_NET_NO_NETWORK;
482 }
483
484 /*
485 * Allocate a scatter/gather buffer and an mbuf.
486 */
487 PPDMSCATTERGATHER pSgBuf = (PPDMSCATTERGATHER)RTMemAlloc(sizeof(*pSgBuf));
488 if (!pSgBuf)
489 return VERR_NO_MEMORY;
490 if (!pGso)
491 {
492 /*
493 * Drop the frame if it is too big.
494 */
495 if (cbMin >= DRVNAT_MAXFRAMESIZE)
496 {
497 Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
498 cbMin));
499 RTMemFree(pSgBuf);
500 return VERR_INVALID_PARAMETER;
501 }
502
503 pSgBuf->pvUser = NULL;
504 pSgBuf->pvAllocator = slirp_ext_m_get(pThis->pNATState, cbMin,
505 &pSgBuf->aSegs[0].pvSeg, &pSgBuf->aSegs[0].cbSeg);
506 if (!pSgBuf->pvAllocator)
507 {
508 RTMemFree(pSgBuf);
509 return VERR_TRY_AGAIN;
510 }
511 }
512 else
513 {
514 /*
515 * Drop the frame if its segment is too big.
516 */
517 if (pGso->cbHdrsTotal + pGso->cbMaxSeg >= DRVNAT_MAXFRAMESIZE)
518 {
519 Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
520 pGso->cbHdrsTotal + pGso->cbMaxSeg));
521 RTMemFree(pSgBuf);
522 return VERR_INVALID_PARAMETER;
523 }
524
525 pSgBuf->pvUser = RTMemDup(pGso, sizeof(*pGso));
526 pSgBuf->pvAllocator = NULL;
527 pSgBuf->aSegs[0].cbSeg = RT_ALIGN_Z(cbMin, 16);
528 pSgBuf->aSegs[0].pvSeg = RTMemAlloc(pSgBuf->aSegs[0].cbSeg);
529 if (!pSgBuf->pvUser || !pSgBuf->aSegs[0].pvSeg)
530 {
531 RTMemFree(pSgBuf->aSegs[0].pvSeg);
532 RTMemFree(pSgBuf->pvUser);
533 RTMemFree(pSgBuf);
534 return VERR_TRY_AGAIN;
535 }
536 }
537
538 /*
539 * Initialize the S/G buffer and return.
540 */
541 pSgBuf->fFlags = PDMSCATTERGATHER_FLAGS_MAGIC | PDMSCATTERGATHER_FLAGS_OWNER_1;
542 pSgBuf->cbUsed = 0;
543 pSgBuf->cbAvailable = pSgBuf->aSegs[0].cbSeg;
544 pSgBuf->cSegs = 1;
545
546#if 0 /* poison */
547 memset(pSgBuf->aSegs[0].pvSeg, 'F', pSgBuf->aSegs[0].cbSeg);
548#endif
549 *ppSgBuf = pSgBuf;
550 return VINF_SUCCESS;
551}
552
553/**
554 * @interface_method_impl{PDMINETWORKUP,pfnFreeBuf}
555 */
556static DECLCALLBACK(int) drvNATNetworkUp_FreeBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf)
557{
558 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
559 Assert(RTCritSectIsOwner(&pThis->XmitLock));
560 drvNATFreeSgBuf(pThis, pSgBuf);
561 return VINF_SUCCESS;
562}
563
564/**
565 * @interface_method_impl{PDMINETWORKUP,pfnSendBuf}
566 */
567static DECLCALLBACK(int) drvNATNetworkUp_SendBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf, bool fOnWorkerThread)
568{
569 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
570 Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_OWNER_MASK) == PDMSCATTERGATHER_FLAGS_OWNER_1);
571 Assert(RTCritSectIsOwner(&pThis->XmitLock));
572
573 int rc;
574 if (pThis->pSlirpThread->enmState == PDMTHREADSTATE_RUNNING)
575 {
576 /* Set an FTM checkpoint as this operation changes the state permanently. */
577 PDMDrvHlpFTSetCheckpoint(pThis->pDrvIns, FTMCHECKPOINTTYPE_NETWORK);
578
579 rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, NULL /*ppReq*/, 0 /*cMillies*/,
580 RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
581 (PFNRT)drvNATSendWorker, 2, pThis, pSgBuf);
582 if (RT_SUCCESS(rc))
583 {
584 drvNATNotifyNATThread(pThis, "drvNATNetworkUp_SendBuf");
585 return VINF_SUCCESS;
586 }
587
588 rc = VERR_NET_NO_BUFFER_SPACE;
589 }
590 else
591 rc = VERR_NET_DOWN;
592 drvNATFreeSgBuf(pThis, pSgBuf);
593 return rc;
594}
595
596/**
597 * @interface_method_impl{PDMINETWORKUP,pfnEndXmit}
598 */
599static DECLCALLBACK(void) drvNATNetworkUp_EndXmit(PPDMINETWORKUP pInterface)
600{
601 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
602 RTCritSectLeave(&pThis->XmitLock);
603}
604
605/**
606 * Get the NAT thread out of poll/WSAWaitForMultipleEvents
607 */
608static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho)
609{
610 int rc;
611#ifndef RT_OS_WINDOWS
612 /* kick poll() */
613 size_t cbIgnored;
614 rc = RTPipeWrite(pThis->hPipeWrite, "", 1, &cbIgnored);
615#else
616 /* kick WSAWaitForMultipleEvents */
617 rc = WSASetEvent(pThis->hWakeupEvent);
618#endif
619 AssertRC(rc);
620}
621
622/**
623 * @interface_method_impl{PDMINETWORKUP,pfnSetPromiscuousMode}
624 */
625static DECLCALLBACK(void) drvNATNetworkUp_SetPromiscuousMode(PPDMINETWORKUP pInterface, bool fPromiscuous)
626{
627 LogFlow(("drvNATNetworkUp_SetPromiscuousMode: fPromiscuous=%d\n", fPromiscuous));
628 /* nothing to do */
629}
630
631/**
632 * Worker function for drvNATNetworkUp_NotifyLinkChanged().
633 * @thread "NAT" thread.
634 */
635static void drvNATNotifyLinkChangedWorker(PDRVNAT pThis, PDMNETWORKLINKSTATE enmLinkState)
636{
637 pThis->enmLinkState = pThis->enmLinkStateWant = enmLinkState;
638 switch (enmLinkState)
639 {
640 case PDMNETWORKLINKSTATE_UP:
641 LogRel(("NAT: Link up\n"));
642 slirp_link_up(pThis->pNATState);
643 break;
644
645 case PDMNETWORKLINKSTATE_DOWN:
646 case PDMNETWORKLINKSTATE_DOWN_RESUME:
647 LogRel(("NAT: Link down\n"));
648 slirp_link_down(pThis->pNATState);
649 break;
650
651 default:
652 AssertMsgFailed(("drvNATNetworkUp_NotifyLinkChanged: unexpected link state %d\n", enmLinkState));
653 }
654}
655
656/**
657 * Notification on link status changes.
658 *
659 * @param pInterface Pointer to the interface structure containing the called function pointer.
660 * @param enmLinkState The new link state.
661 * @thread EMT
662 */
663static DECLCALLBACK(void) drvNATNetworkUp_NotifyLinkChanged(PPDMINETWORKUP pInterface, PDMNETWORKLINKSTATE enmLinkState)
664{
665 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
666
667 LogFlow(("drvNATNetworkUp_NotifyLinkChanged: enmLinkState=%d\n", enmLinkState));
668
669 /* Don't queue new requests if the NAT thread is not running (e.g. paused,
670 * stopping), otherwise we would deadlock. Memorize the change. */
671 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
672 {
673 pThis->enmLinkStateWant = enmLinkState;
674 return;
675 }
676
677 PRTREQ pReq;
678 int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /*cMillies*/, RTREQFLAGS_VOID,
679 (PFNRT)drvNATNotifyLinkChangedWorker, 2, pThis, enmLinkState);
680 if (rc == VERR_TIMEOUT)
681 {
682 drvNATNotifyNATThread(pThis, "drvNATNetworkUp_NotifyLinkChanged");
683 rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
684 AssertRC(rc);
685 }
686 else
687 AssertRC(rc);
688 RTReqRelease(pReq);
689}
690
691static void drvNATNotifyApplyPortForwardCommand(PDRVNAT pThis, bool fRemove,
692 bool fUdp, const char *pHostIp,
693 uint16_t u16HostPort, const char *pGuestIp, uint16_t u16GuestPort)
694{
695 struct in_addr guestIp, hostIp;
696
697 if ( pHostIp == NULL
698 || inet_aton(pHostIp, &hostIp) == 0)
699 hostIp.s_addr = INADDR_ANY;
700
701 if ( pGuestIp == NULL
702 || inet_aton(pGuestIp, &guestIp) == 0)
703 guestIp.s_addr = pThis->GuestIP;
704
705 if (fRemove)
706 slirp_remove_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
707 else
708 slirp_add_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
709}
710
711static DECLCALLBACK(int) drvNATNetworkNatConfigRedirect(PPDMINETWORKNATCONFIG pInterface, bool fRemove,
712 bool fUdp, const char *pHostIp, uint16_t u16HostPort,
713 const char *pGuestIp, uint16_t u16GuestPort)
714{
715 LogFlowFunc(("fRemove=%d, fUdp=%d, pHostIp=%s, u16HostPort=%u, pGuestIp=%s, u16GuestPort=%u\n",
716 RT_BOOL(fRemove), RT_BOOL(fUdp), pHostIp, u16HostPort, pGuestIp, u16GuestPort));
717 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
718 /* Execute the command directly if the VM is not running. */
719 int rc;
720 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
721 {
722 drvNATNotifyApplyPortForwardCommand(pThis, fRemove, fUdp, pHostIp,
723 u16HostPort, pGuestIp,u16GuestPort);
724 rc = VINF_SUCCESS;
725 }
726 else
727 {
728 PRTREQ pReq;
729 rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /*cMillies*/, RTREQFLAGS_VOID,
730 (PFNRT)drvNATNotifyApplyPortForwardCommand, 7, pThis, fRemove,
731 fUdp, pHostIp, u16HostPort, pGuestIp, u16GuestPort);
732 if (rc == VERR_TIMEOUT)
733 {
734 drvNATNotifyNATThread(pThis, "drvNATNetworkNatConfigRedirect");
735 rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
736 AssertRC(rc);
737 }
738 else
739 AssertRC(rc);
740
741 RTReqRelease(pReq);
742 }
743 return rc;
744}
745
746/**
747 * NAT thread handling the slirp stuff.
748 *
749 * The slirp implementation is single-threaded so we execute this enginre in a
750 * dedicated thread. We take care that this thread does not become the
751 * bottleneck: If the guest wants to send, a request is enqueued into the
752 * hSlirpReqQueue and handled asynchronously by this thread. If this thread
753 * wants to deliver packets to the guest, it enqueues a request into
754 * hRecvReqQueue which is later handled by the Recv thread.
755 */
756static DECLCALLBACK(int) drvNATAsyncIoThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
757{
758 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
759 int nFDs = -1;
760#ifdef RT_OS_WINDOWS
761 HANDLE *phEvents = slirp_get_events(pThis->pNATState);
762 unsigned int cBreak = 0;
763#else /* RT_OS_WINDOWS */
764 unsigned int cPollNegRet = 0;
765#endif /* !RT_OS_WINDOWS */
766
767 LogFlow(("drvNATAsyncIoThread: pThis=%p\n", pThis));
768
769 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
770 return VINF_SUCCESS;
771
772 if (pThis->enmLinkStateWant != pThis->enmLinkState)
773 drvNATNotifyLinkChangedWorker(pThis, pThis->enmLinkStateWant);
774
775 /*
776 * Polling loop.
777 */
778 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
779 {
780 /*
781 * To prevent concurrent execution of sending/receiving threads
782 */
783#ifndef RT_OS_WINDOWS
784 nFDs = slirp_get_nsock(pThis->pNATState);
785 /* allocation for all sockets + Management pipe */
786 struct pollfd *polls = (struct pollfd *)RTMemAlloc((1 + nFDs) * sizeof(struct pollfd) + sizeof(uint32_t));
787 if (polls == NULL)
788 return VERR_NO_MEMORY;
789
790 /* don't pass the management pipe */
791 slirp_select_fill(pThis->pNATState, &nFDs, &polls[1]);
792
793 polls[0].fd = RTPipeToNative(pThis->hPipeRead);
794 /* POLLRDBAND usually doesn't used on Linux but seems used on Solaris */
795 polls[0].events = POLLRDNORM | POLLPRI | POLLRDBAND;
796 polls[0].revents = 0;
797
798 int cChangedFDs = poll(polls, nFDs + 1, slirp_get_timeout_ms(pThis->pNATState));
799 if (cChangedFDs < 0)
800 {
801 if (errno == EINTR)
802 {
803 Log2(("NAT: signal was caught while sleep on poll\n"));
804 /* No error, just process all outstanding requests but don't wait */
805 cChangedFDs = 0;
806 }
807 else if (cPollNegRet++ > 128)
808 {
809 LogRel(("NAT: Poll returns (%s) suppressed %d\n", strerror(errno), cPollNegRet));
810 cPollNegRet = 0;
811 }
812 }
813
814 if (cChangedFDs >= 0)
815 {
816 slirp_select_poll(pThis->pNATState, &polls[1], nFDs);
817 if (polls[0].revents & (POLLRDNORM|POLLPRI|POLLRDBAND))
818 {
819 /* drain the pipe
820 *
821 * Note! drvNATSend decoupled so we don't know how many times
822 * device's thread sends before we've entered multiplex,
823 * so to avoid false alarm drain pipe here to the very end
824 *
825 * @todo: Probably we should counter drvNATSend to count how
826 * deep pipe has been filed before drain.
827 *
828 */
829 /** @todo XXX: Make it reading exactly we need to drain the
830 * pipe.*/
831 char ch;
832 size_t cbRead;
833 RTPipeRead(pThis->hPipeRead, &ch, 1, &cbRead);
834 }
835 }
836 /* process _all_ outstanding requests but don't wait */
837 RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
838 RTMemFree(polls);
839
840#else /* RT_OS_WINDOWS */
841 nFDs = -1;
842 slirp_select_fill(pThis->pNATState, &nFDs);
843 DWORD dwEvent = WSAWaitForMultipleEvents(nFDs, phEvents, FALSE,
844 slirp_get_timeout_ms(pThis->pNATState),
845 /* :fAlertable */ TRUE);
846 if ( (dwEvent < WSA_WAIT_EVENT_0 || dwEvent > WSA_WAIT_EVENT_0 + nFDs - 1)
847 && dwEvent != WSA_WAIT_TIMEOUT && dwEvent != WSA_WAIT_IO_COMPLETION)
848 {
849 int error = WSAGetLastError();
850 LogRel(("NAT: WSAWaitForMultipleEvents returned %d (error %d)\n", dwEvent, error));
851 RTAssertPanic();
852 }
853
854 if (dwEvent == WSA_WAIT_TIMEOUT)
855 {
856 /* only check for slow/fast timers */
857 slirp_select_poll(pThis->pNATState, /* fTimeout=*/true);
858 continue;
859 }
860 /* poll the sockets in any case */
861 Log2(("%s: poll\n", __FUNCTION__));
862 slirp_select_poll(pThis->pNATState, /* fTimeout=*/false);
863 /* process _all_ outstanding requests but don't wait */
864 RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
865# ifdef VBOX_NAT_DELAY_HACK
866 if (cBreak++ > 128)
867 {
868 cBreak = 0;
869 RTThreadSleep(2);
870 }
871# endif
872#endif /* RT_OS_WINDOWS */
873 }
874
875 return VINF_SUCCESS;
876}
877
878
879/**
880 * Unblock the send thread so it can respond to a state change.
881 *
882 * @returns VBox status code.
883 * @param pDevIns The pcnet device instance.
884 * @param pThread The send thread.
885 */
886static DECLCALLBACK(int) drvNATAsyncIoWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
887{
888 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
889
890 drvNATNotifyNATThread(pThis, "drvNATAsyncIoWakeup");
891 return VINF_SUCCESS;
892}
893
894/**
895 * Function called by slirp to check if it's possible to feed incoming data to the network port.
896 * @returns 1 if possible.
897 * @returns 0 if not possible.
898 */
899int slirp_can_output(void *pvUser)
900{
901 return 1;
902}
903
904void slirp_push_recv_thread(void *pvUser)
905{
906 PDRVNAT pThis = (PDRVNAT)pvUser;
907 Assert(pThis);
908 drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
909}
910
911void slirp_urg_output(void *pvUser, struct mbuf *m, const uint8_t *pu8Buf, int cb)
912{
913 PDRVNAT pThis = (PDRVNAT)pvUser;
914 Assert(pThis);
915
916 PRTREQ pReq = NULL;
917
918 /* don't queue new requests when the NAT thread is about to stop */
919 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
920 return;
921
922 ASMAtomicIncU32(&pThis->cUrgPkts);
923 int rc = RTReqQueueCallEx(pThis->hUrgRecvReqQueue, NULL /*ppReq*/, 0 /*cMillies*/, RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
924 (PFNRT)drvNATUrgRecvWorker, 4, pThis, pu8Buf, cb, m);
925 AssertRC(rc);
926 drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
927}
928
929/**
930 * Function called by slirp to wake up device after VERR_TRY_AGAIN
931 */
932void slirp_output_pending(void *pvUser)
933{
934 PDRVNAT pThis = (PDRVNAT)pvUser;
935 Assert(pThis);
936 LogFlowFuncEnter();
937 pThis->pIAboveNet->pfnXmitPending(pThis->pIAboveNet);
938 LogFlowFuncLeave();
939}
940
941/**
942 * Function called by slirp to feed incoming data to the NIC.
943 */
944void slirp_output(void *pvUser, struct mbuf *m, const uint8_t *pu8Buf, int cb)
945{
946 PDRVNAT pThis = (PDRVNAT)pvUser;
947 Assert(pThis);
948
949 LogFlow(("slirp_output BEGIN %p %d\n", pu8Buf, cb));
950 Log6(("slirp_output: pu8Buf=%p cb=%#x (pThis=%p)\n%.*Rhxd\n", pu8Buf, cb, pThis, cb, pu8Buf));
951
952 PRTREQ pReq = NULL;
953
954 /* don't queue new requests when the NAT thread is about to stop */
955 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
956 return;
957
958 ASMAtomicIncU32(&pThis->cPkts);
959 int rc = RTReqQueueCallEx(pThis->hRecvReqQueue, NULL /*ppReq*/, 0 /*cMillies*/, RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
960 (PFNRT)drvNATRecvWorker, 4, pThis, pu8Buf, cb, m);
961 AssertRC(rc);
962 drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
963 STAM_COUNTER_INC(&pThis->StatQueuePktSent);
964 LogFlowFuncLeave();
965}
966
967
968/**
969 * @interface_method_impl{PDMINETWORKNATCONFIG,pfnNotifyDnsChanged}
970 *
971 * We are notified that host's resolver configuration has changed. In
972 * the current setup we don't get any details and just reread that
973 * information ourselves.
974 */
975static DECLCALLBACK(void) drvNATNotifyDnsChanged(PPDMINETWORKNATCONFIG pInterface)
976{
977 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
978 drvNATUpdateDNS(pThis, /* fFlapLink */ true);
979}
980
981
982#ifdef RT_OS_DARWIN
983/**
984 * Callback for the SystemConfiguration framework to notify us whenever the DNS
985 * server changes.
986 *
987 * @returns nothing.
988 * @param hDynStor The DynamicStore handle.
989 * @param hChangedKey Array of changed keys we watch for.
990 * @param pvUser Opaque user data (NAT driver instance).
991 */
992static DECLCALLBACK(void) drvNatDnsChanged(SCDynamicStoreRef hDynStor, CFArrayRef hChangedKeys, void *pvUser)
993{
994 PDRVNAT pThis = (PDRVNAT)pvUser;
995
996 Log2(("NAT: System configuration has changed\n"));
997
998 /* Check if any of parameters we are interested in were actually changed. If the size
999 * of hChangedKeys is 0, it means that SCDynamicStore has been restarted. */
1000 if (hChangedKeys && CFArrayGetCount(hChangedKeys) > 0)
1001 {
1002 /* Look to the updated parameters in particular. */
1003 CFStringRef pDNSKey = CFSTR("State:/Network/Global/DNS");
1004
1005 if (CFArrayContainsValue(hChangedKeys, CFRangeMake(0, CFArrayGetCount(hChangedKeys)), pDNSKey))
1006 {
1007 LogRel(("NAT: DNS servers changed, triggering reconnect\n"));
1008#if 0
1009 CFDictionaryRef hDnsDict = (CFDictionaryRef)SCDynamicStoreCopyValue(hDynStor, pDNSKey);
1010 if (hDnsDict)
1011 {
1012 CFArrayRef hArrAddresses = (CFArrayRef)CFDictionaryGetValue(hDnsDict, kSCPropNetDNSServerAddresses);
1013 if (hArrAddresses && CFArrayGetCount(hArrAddresses) > 0)
1014 {
1015 /* Dump DNS servers list. */
1016 for (int i = 0; i < CFArrayGetCount(hArrAddresses); i++)
1017 {
1018 CFStringRef pDNSAddrStr = (CFStringRef)CFArrayGetValueAtIndex(hArrAddresses, i);
1019 const char *pszDNSAddr = pDNSAddrStr ? CFStringGetCStringPtr(pDNSAddrStr, CFStringGetSystemEncoding()) : NULL;
1020 LogRel(("NAT: New DNS server#%d: %s\n", i, pszDNSAddr ? pszDNSAddr : "None"));
1021 }
1022 }
1023 else
1024 LogRel(("NAT: DNS server list is empty (1)\n"));
1025
1026 CFRelease(hDnsDict);
1027 }
1028 else
1029 LogRel(("NAT: DNS server list is empty (2)\n"));
1030#endif
1031 drvNATUpdateDNS(pThis, /* fFlapLink */ true);
1032 }
1033 else
1034 Log2(("NAT: No DNS changes detected\n"));
1035 }
1036 else
1037 Log2(("NAT: SCDynamicStore has been restarted\n"));
1038}
1039#endif
1040
1041/**
1042 * @interface_method_impl{PDMIBASE,pfnQueryInterface}
1043 */
1044static DECLCALLBACK(void *) drvNATQueryInterface(PPDMIBASE pInterface, const char *pszIID)
1045{
1046 PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
1047 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1048
1049 PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
1050 PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKUP, &pThis->INetworkUp);
1051 PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKNATCONFIG, &pThis->INetworkNATCfg);
1052 return NULL;
1053}
1054
1055
1056/**
1057 * Get the MAC address into the slirp stack.
1058 *
1059 * Called by drvNATLoadDone and drvNATPowerOn.
1060 */
1061static void drvNATSetMac(PDRVNAT pThis)
1062{
1063#if 0 /* XXX: do we still need this for anything? */
1064 if (pThis->pIAboveConfig)
1065 {
1066 RTMAC Mac;
1067 pThis->pIAboveConfig->pfnGetMac(pThis->pIAboveConfig, &Mac);
1068 }
1069#endif
1070}
1071
1072
1073/**
1074 * After loading we have to pass the MAC address of the ethernet device to the slirp stack.
1075 * Otherwise the guest is not reachable until it performs a DHCP request or an ARP request
1076 * (usually done during guest boot).
1077 */
1078static DECLCALLBACK(int) drvNATLoadDone(PPDMDRVINS pDrvIns, PSSMHANDLE pSSMHandle)
1079{
1080 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1081 drvNATSetMac(pThis);
1082 return VINF_SUCCESS;
1083}
1084
1085
1086/**
1087 * Some guests might not use DHCP to retrieve an IP but use a static IP.
1088 */
1089static DECLCALLBACK(void) drvNATPowerOn(PPDMDRVINS pDrvIns)
1090{
1091 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1092 drvNATSetMac(pThis);
1093}
1094
1095
1096/**
1097 * @interface_method_impl{PDMDEVREG,pfnResume}
1098 */
1099static DECLCALLBACK(void) drvNATResume(PPDMDRVINS pDrvIns)
1100{
1101 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1102 VMRESUMEREASON enmReason = PDMDrvHlpVMGetResumeReason(pDrvIns);
1103
1104 switch (enmReason)
1105 {
1106 case VMRESUMEREASON_HOST_RESUME:
1107 bool fFlapLink;
1108#if HAVE_NOTIFICATION_FOR_DNS_UPDATE
1109 /* let event handler do it if necessary */
1110 fFlapLink = false;
1111#else
1112 /* XXX: when in doubt, use brute force */
1113 fFlapLink = true;
1114#endif
1115 drvNATUpdateDNS(pThis, fFlapLink);
1116 return;
1117 default: /* Ignore every other resume reason. */
1118 /* do nothing */
1119 return;
1120 }
1121}
1122
1123
1124static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis)
1125{
1126 slirpReleaseDnsSettings(pThis->pNATState);
1127 slirpInitializeDnsSettings(pThis->pNATState);
1128 return VINF_SUCCESS;
1129}
1130
1131/**
1132 * This function at this stage could be called from two places, but both from non-NAT thread,
1133 * - drvNATResume (EMT?)
1134 * - drvNatDnsChanged (darwin, GUI or main) "listener"
1135 * When Main's interface IHost will support host network configuration change event on every host,
1136 * we won't call it from drvNATResume, but from listener of Main event in the similar way it done
1137 * for port-forwarding, and it wan't be on GUI/main thread, but on EMT thread only.
1138 *
1139 * Thread here is important, because we need to change DNS server list and domain name (+ perhaps,
1140 * search string) at runtime (VBOX_NAT_ENFORCE_INTERNAL_DNS_UPDATE), we can do it safely on NAT thread,
1141 * so with changing other variables (place where we handle update) the main mechanism of update
1142 * _won't_ be changed, the only thing will change is drop of fFlapLink parameter.
1143 */
1144DECLINLINE(void) drvNATUpdateDNS(PDRVNAT pThis, bool fFlapLink)
1145{
1146 int strategy = slirp_host_network_configuration_change_strategy_selector(pThis->pNATState);
1147 switch (strategy)
1148 {
1149 case VBOX_NAT_DNS_DNSPROXY:
1150 {
1151 /**
1152 * XXX: Here or in _strategy_selector we should deal with network change
1153 * in "network change" scenario domain name change we have to update guest lease
1154 * forcibly.
1155 * Note at that built-in dhcp also updates DNS information on NAT thread.
1156 */
1157 /**
1158 * It's unsafe to to do it directly on non-NAT thread
1159 * so we schedule the worker and kick the NAT thread.
1160 */
1161 int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, NULL /*ppReq*/, 0 /*cMillies*/,
1162 RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
1163 (PFNRT)drvNATReinitializeHostNameResolving, 1, pThis);
1164 if (RT_SUCCESS(rc))
1165 drvNATNotifyNATThread(pThis, "drvNATUpdateDNS");
1166
1167 return;
1168 }
1169
1170 case VBOX_NAT_DNS_EXTERNAL:
1171 /*
1172 * Host resumed from a suspend and the network might have changed.
1173 * Disconnect the guest from the network temporarily to let it pick up the changes.
1174 */
1175 if (fFlapLink)
1176 pThis->pIAboveConfig->pfnSetLinkState(pThis->pIAboveConfig,
1177 PDMNETWORKLINKSTATE_DOWN_RESUME);
1178 return;
1179
1180 case VBOX_NAT_DNS_HOSTRESOLVER:
1181 default:
1182 return;
1183 }
1184}
1185
1186
1187/**
1188 * Info handler.
1189 */
1190static DECLCALLBACK(void) drvNATInfo(PPDMDRVINS pDrvIns, PCDBGFINFOHLP pHlp, const char *pszArgs)
1191{
1192 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1193 slirp_info(pThis->pNATState, pHlp, pszArgs);
1194}
1195
1196#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1197static int drvNATConstructDNSMappings(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pMappingsCfg)
1198{
1199 int rc = VINF_SUCCESS;
1200 LogFlowFunc(("ENTER: iInstance:%d\n", iInstance));
1201 for (PCFGMNODE pNode = CFGMR3GetFirstChild(pMappingsCfg); pNode; pNode = CFGMR3GetNextChild(pNode))
1202 {
1203 if (!CFGMR3AreValuesValid(pNode, "HostName\0HostNamePattern\0HostIP\0"))
1204 return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1205 N_("Unknown configuration in dns mapping"));
1206 char szHostNameOrPattern[255];
1207 bool fPattern = false;
1208 RT_ZERO(szHostNameOrPattern);
1209 GET_STRING(rc, pThis, pNode, "HostName", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1210 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1211 {
1212 GET_STRING(rc, pThis, pNode, "HostNamePattern", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1213 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1214 {
1215 char szNodeName[225];
1216 RT_ZERO(szNodeName);
1217 CFGMR3GetName(pNode, szNodeName, sizeof(szNodeName));
1218 LogRel(("NAT: Neither 'HostName' nor 'HostNamePattern' is specified for mapping %s\n", szNodeName));
1219 continue;
1220 }
1221 fPattern = true;
1222 }
1223 struct in_addr HostIP;
1224 GETIP_DEF(rc, pThis, pNode, HostIP, INADDR_ANY);
1225 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1226 {
1227 LogRel(("NAT: DNS mapping %s is ignored (address not pointed)\n", szHostNameOrPattern));
1228 continue;
1229 }
1230 slirp_add_host_resolver_mapping(pThis->pNATState, szHostNameOrPattern, fPattern, HostIP.s_addr);
1231 }
1232 LogFlowFunc(("LEAVE: %Rrc\n", rc));
1233 return rc;
1234}
1235#endif /* !VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER */
1236
1237
1238/**
1239 * Sets up the redirectors.
1240 *
1241 * @returns VBox status code.
1242 * @param pCfg The configuration handle.
1243 */
1244static int drvNATConstructRedir(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pCfg, PRTNETADDRIPV4 pNetwork)
1245{
1246 /*
1247 * Enumerate redirections.
1248 */
1249 for (PCFGMNODE pNode = CFGMR3GetFirstChild(pCfg); pNode; pNode = CFGMR3GetNextChild(pNode))
1250 {
1251#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1252 char szNodeName[32];
1253 CFGMR3GetName(pNode, szNodeName, 32);
1254 if ( !RTStrICmp(szNodeName, "HostResolverMappings")
1255 || !RTStrICmp(szNodeName, "AttachedDriver"))
1256 continue;
1257#endif
1258 /*
1259 * Validate the port forwarding config.
1260 */
1261 if (!CFGMR3AreValuesValid(pNode, "Protocol\0UDP\0HostPort\0GuestPort\0GuestIP\0BindIP\0"))
1262 return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1263 N_("Unknown configuration in port forwarding"));
1264
1265 /* protocol type */
1266 bool fUDP;
1267 char szProtocol[32];
1268 int rc;
1269 GET_STRING(rc, pThis, pNode, "Protocol", szProtocol[0], sizeof(szProtocol));
1270 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1271 {
1272 fUDP = false;
1273 GET_BOOL(rc, pThis, pNode, "UDP", fUDP);
1274 }
1275 else if (RT_SUCCESS(rc))
1276 {
1277 if (!RTStrICmp(szProtocol, "TCP"))
1278 fUDP = false;
1279 else if (!RTStrICmp(szProtocol, "UDP"))
1280 fUDP = true;
1281 else
1282 return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
1283 N_("NAT#%d: Invalid configuration value for \"Protocol\": \"%s\""),
1284 iInstance, szProtocol);
1285 }
1286 else
1287 return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS,
1288 N_("NAT#%d: configuration query for \"Protocol\" failed"),
1289 iInstance);
1290 /* host port */
1291 int32_t iHostPort;
1292 GET_S32_STRICT(rc, pThis, pNode, "HostPort", iHostPort);
1293
1294 /* guest port */
1295 int32_t iGuestPort;
1296 GET_S32_STRICT(rc, pThis, pNode, "GuestPort", iGuestPort);
1297
1298 /* host address ("BindIP" name is rather unfortunate given "HostPort" to go with it) */
1299 struct in_addr BindIP;
1300 GETIP_DEF(rc, pThis, pNode, BindIP, INADDR_ANY);
1301
1302 /* guest address */
1303 struct in_addr GuestIP;
1304 GETIP_DEF(rc, pThis, pNode, GuestIP, INADDR_ANY);
1305
1306 /*
1307 * Call slirp about it.
1308 */
1309 if (slirp_add_redirect(pThis->pNATState, fUDP, BindIP, iHostPort, GuestIP, iGuestPort) < 0)
1310 return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_SETUP, RT_SRC_POS,
1311 N_("NAT#%d: configuration error: failed to set up "
1312 "redirection of %d to %d. Probably a conflict with "
1313 "existing services or other rules"), iInstance, iHostPort,
1314 iGuestPort);
1315 } /* for each redir rule */
1316
1317 return VINF_SUCCESS;
1318}
1319
1320
1321/**
1322 * Destruct a driver instance.
1323 *
1324 * Most VM resources are freed by the VM. This callback is provided so that any non-VM
1325 * resources can be freed correctly.
1326 *
1327 * @param pDrvIns The driver instance data.
1328 */
1329static DECLCALLBACK(void) drvNATDestruct(PPDMDRVINS pDrvIns)
1330{
1331 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1332 LogFlow(("drvNATDestruct:\n"));
1333 PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
1334
1335 if (pThis->pNATState)
1336 {
1337 slirp_term(pThis->pNATState);
1338 slirp_deregister_statistics(pThis->pNATState, pDrvIns);
1339#ifdef VBOX_WITH_STATISTICS
1340# define DRV_PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1341# define DRV_COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1342# include "counters.h"
1343#endif
1344 pThis->pNATState = NULL;
1345 }
1346
1347 RTReqQueueDestroy(pThis->hSlirpReqQueue);
1348 pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1349
1350 RTReqQueueDestroy(pThis->hUrgRecvReqQueue);
1351 pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1352
1353 RTSemEventDestroy(pThis->EventRecv);
1354 pThis->EventRecv = NIL_RTSEMEVENT;
1355
1356 RTSemEventDestroy(pThis->EventUrgRecv);
1357 pThis->EventUrgRecv = NIL_RTSEMEVENT;
1358
1359 if (RTCritSectIsInitialized(&pThis->DevAccessLock))
1360 RTCritSectDelete(&pThis->DevAccessLock);
1361
1362 if (RTCritSectIsInitialized(&pThis->XmitLock))
1363 RTCritSectDelete(&pThis->XmitLock);
1364
1365#ifdef RT_OS_DARWIN
1366 /* Cleanup the DNS watcher. */
1367 CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1368 CFRetain(hRunLoopMain);
1369 CFRunLoopRemoveSource(hRunLoopMain, pThis->hRunLoopSrcDnsWatcher, kCFRunLoopCommonModes);
1370 CFRelease(hRunLoopMain);
1371 CFRelease(pThis->hRunLoopSrcDnsWatcher);
1372 pThis->hRunLoopSrcDnsWatcher = NULL;
1373#endif
1374}
1375
1376
1377/**
1378 * Construct a NAT network transport driver instance.
1379 *
1380 * @copydoc FNPDMDRVCONSTRUCT
1381 */
1382static DECLCALLBACK(int) drvNATConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
1383{
1384 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1385 LogFlow(("drvNATConstruct:\n"));
1386 PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
1387
1388 /*
1389 * Init the static parts.
1390 */
1391 pThis->pDrvIns = pDrvIns;
1392 pThis->pNATState = NULL;
1393 pThis->pszTFTPPrefix = NULL;
1394 pThis->pszBootFile = NULL;
1395 pThis->pszNextServer = NULL;
1396 pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1397 pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1398 pThis->EventRecv = NIL_RTSEMEVENT;
1399 pThis->EventUrgRecv = NIL_RTSEMEVENT;
1400#ifdef RT_OS_DARWIN
1401 pThis->hRunLoopSrcDnsWatcher = NULL;
1402#endif
1403
1404 /* IBase */
1405 pDrvIns->IBase.pfnQueryInterface = drvNATQueryInterface;
1406
1407 /* INetwork */
1408 pThis->INetworkUp.pfnBeginXmit = drvNATNetworkUp_BeginXmit;
1409 pThis->INetworkUp.pfnAllocBuf = drvNATNetworkUp_AllocBuf;
1410 pThis->INetworkUp.pfnFreeBuf = drvNATNetworkUp_FreeBuf;
1411 pThis->INetworkUp.pfnSendBuf = drvNATNetworkUp_SendBuf;
1412 pThis->INetworkUp.pfnEndXmit = drvNATNetworkUp_EndXmit;
1413 pThis->INetworkUp.pfnSetPromiscuousMode = drvNATNetworkUp_SetPromiscuousMode;
1414 pThis->INetworkUp.pfnNotifyLinkChanged = drvNATNetworkUp_NotifyLinkChanged;
1415
1416 /* NAT engine configuration */
1417 pThis->INetworkNATCfg.pfnRedirectRuleCommand = drvNATNetworkNatConfigRedirect;
1418#if HAVE_NOTIFICATION_FOR_DNS_UPDATE && !defined(RT_OS_DARWIN)
1419 /*
1420 * On OS X we stick to the old OS X specific notifications for
1421 * now. Elsewhere use IHostNameResolutionConfigurationChangeEvent
1422 * by enbaling HAVE_NOTIFICATION_FOR_DNS_UPDATE in libslirp.h.
1423 * This code is still in a bit of flux and is implemented and
1424 * enabled in steps to simplify more conservative backporting.
1425 */
1426 pThis->INetworkNATCfg.pfnNotifyDnsChanged = drvNATNotifyDnsChanged;
1427#else
1428 pThis->INetworkNATCfg.pfnNotifyDnsChanged = NULL;
1429#endif
1430
1431 /*
1432 * Validate the config.
1433 */
1434 if (!CFGMR3AreValuesValid(pCfg,
1435 "PassDomain\0TFTPPrefix\0BootFile\0Network"
1436 "\0NextServer\0DNSProxy\0BindIP\0UseHostResolver\0"
1437 "SlirpMTU\0AliasMode\0"
1438 "SockRcv\0SockSnd\0TcpRcv\0TcpSnd\0"
1439 "ICMPCacheLimit\0"
1440 "SoMaxConnection\0"
1441#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1442 "HostResolverMappings\0"
1443#endif
1444 ))
1445 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1446 N_("Unknown NAT configuration option, only supports PassDomain,"
1447 " TFTPPrefix, BootFile and Network"));
1448
1449 /*
1450 * Get the configuration settings.
1451 */
1452 int rc;
1453 bool fPassDomain = true;
1454 GET_BOOL(rc, pThis, pCfg, "PassDomain", fPassDomain);
1455
1456 GET_STRING_ALLOC(rc, pThis, pCfg, "TFTPPrefix", pThis->pszTFTPPrefix);
1457 GET_STRING_ALLOC(rc, pThis, pCfg, "BootFile", pThis->pszBootFile);
1458 GET_STRING_ALLOC(rc, pThis, pCfg, "NextServer", pThis->pszNextServer);
1459
1460 int fDNSProxy = 0;
1461 GET_S32(rc, pThis, pCfg, "DNSProxy", fDNSProxy);
1462 int fUseHostResolver = 0;
1463 GET_S32(rc, pThis, pCfg, "UseHostResolver", fUseHostResolver);
1464 int MTU = 1500;
1465 GET_S32(rc, pThis, pCfg, "SlirpMTU", MTU);
1466 int i32AliasMode = 0;
1467 int i32MainAliasMode = 0;
1468 GET_S32(rc, pThis, pCfg, "AliasMode", i32MainAliasMode);
1469 int iIcmpCacheLimit = 100;
1470 GET_S32(rc, pThis, pCfg, "ICMPCacheLimit", iIcmpCacheLimit);
1471
1472 i32AliasMode |= (i32MainAliasMode & 0x1 ? 0x1 : 0);
1473 i32AliasMode |= (i32MainAliasMode & 0x2 ? 0x40 : 0);
1474 i32AliasMode |= (i32MainAliasMode & 0x4 ? 0x4 : 0);
1475 int i32SoMaxConn = 10;
1476 GET_S32(rc, pThis, pCfg, "SoMaxConnection", i32SoMaxConn);
1477 /*
1478 * Query the network port interface.
1479 */
1480 pThis->pIAboveNet = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKDOWN);
1481 if (!pThis->pIAboveNet)
1482 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1483 N_("Configuration error: the above device/driver didn't "
1484 "export the network port interface"));
1485 pThis->pIAboveConfig = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKCONFIG);
1486 if (!pThis->pIAboveConfig)
1487 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1488 N_("Configuration error: the above device/driver didn't "
1489 "export the network config interface"));
1490
1491 /* Generate a network address for this network card. */
1492 char szNetwork[32]; /* xxx.xxx.xxx.xxx/yy */
1493 GET_STRING(rc, pThis, pCfg, "Network", szNetwork[0], sizeof(szNetwork));
1494 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1495 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT%d: Configuration error: missing network"),
1496 pDrvIns->iInstance);
1497
1498 RTNETADDRIPV4 Network, Netmask;
1499
1500 rc = RTCidrStrToIPv4(szNetwork, &Network, &Netmask);
1501 if (RT_FAILURE(rc))
1502 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1503 N_("NAT#%d: Configuration error: network '%s' describes not a valid IPv4 network"),
1504 pDrvIns->iInstance, szNetwork);
1505
1506 /*
1507 * Initialize slirp.
1508 */
1509 rc = slirp_init(&pThis->pNATState, RT_H2N_U32(Network.u), Netmask.u,
1510 fPassDomain, !!fUseHostResolver, i32AliasMode,
1511 iIcmpCacheLimit, pThis);
1512 if (RT_SUCCESS(rc))
1513 {
1514 slirp_set_dhcp_TFTP_prefix(pThis->pNATState, pThis->pszTFTPPrefix);
1515 slirp_set_dhcp_TFTP_bootfile(pThis->pNATState, pThis->pszBootFile);
1516 slirp_set_dhcp_next_server(pThis->pNATState, pThis->pszNextServer);
1517 slirp_set_dhcp_dns_proxy(pThis->pNATState, !!fDNSProxy);
1518 slirp_set_mtu(pThis->pNATState, MTU);
1519 slirp_set_somaxconn(pThis->pNATState, i32SoMaxConn);
1520 char *pszBindIP = NULL;
1521 GET_STRING_ALLOC(rc, pThis, pCfg, "BindIP", pszBindIP);
1522 rc = slirp_set_binding_address(pThis->pNATState, pszBindIP);
1523 if (rc != 0 && pszBindIP && *pszBindIP)
1524 LogRel(("NAT: Value of BindIP has been ignored\n"));
1525
1526 if(pszBindIP != NULL)
1527 MMR3HeapFree(pszBindIP);
1528#define SLIRP_SET_TUNING_VALUE(name, setter) \
1529 do \
1530 { \
1531 int len = 0; \
1532 rc = CFGMR3QueryS32(pCfg, name, &len); \
1533 if (RT_SUCCESS(rc)) \
1534 setter(pThis->pNATState, len); \
1535 } while(0)
1536
1537 SLIRP_SET_TUNING_VALUE("SockRcv", slirp_set_rcvbuf);
1538 SLIRP_SET_TUNING_VALUE("SockSnd", slirp_set_sndbuf);
1539 SLIRP_SET_TUNING_VALUE("TcpRcv", slirp_set_tcp_rcvspace);
1540 SLIRP_SET_TUNING_VALUE("TcpSnd", slirp_set_tcp_sndspace);
1541
1542 slirp_register_statistics(pThis->pNATState, pDrvIns);
1543#ifdef VBOX_WITH_STATISTICS
1544# define DRV_PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
1545# define DRV_COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
1546# include "counters.h"
1547#endif
1548
1549#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1550 PCFGMNODE pMappingsCfg = CFGMR3GetChild(pCfg, "HostResolverMappings");
1551
1552 if (pMappingsCfg)
1553 {
1554 rc = drvNATConstructDNSMappings(pDrvIns->iInstance, pThis, pMappingsCfg);
1555 AssertRC(rc);
1556 }
1557#endif
1558 rc = drvNATConstructRedir(pDrvIns->iInstance, pThis, pCfg, &Network);
1559 if (RT_SUCCESS(rc))
1560 {
1561 /*
1562 * Register a load done notification to get the MAC address into the slirp
1563 * engine after we loaded a guest state.
1564 */
1565 rc = PDMDrvHlpSSMRegisterLoadDone(pDrvIns, drvNATLoadDone);
1566 AssertLogRelRCReturn(rc, rc);
1567
1568 rc = RTReqQueueCreate(&pThis->hSlirpReqQueue);
1569 AssertLogRelRCReturn(rc, rc);
1570
1571 rc = RTReqQueueCreate(&pThis->hRecvReqQueue);
1572 AssertLogRelRCReturn(rc, rc);
1573
1574 rc = RTReqQueueCreate(&pThis->hUrgRecvReqQueue);
1575 AssertLogRelRCReturn(rc, rc);
1576
1577 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pRecvThread, pThis, drvNATRecv,
1578 drvNATRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATRX");
1579 AssertRCReturn(rc, rc);
1580
1581 rc = RTSemEventCreate(&pThis->EventRecv);
1582 AssertRCReturn(rc, rc);
1583
1584 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pUrgRecvThread, pThis, drvNATUrgRecv,
1585 drvNATUrgRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATURGRX");
1586 AssertRCReturn(rc, rc);
1587
1588 rc = RTSemEventCreate(&pThis->EventRecv);
1589 AssertRCReturn(rc, rc);
1590
1591 rc = RTSemEventCreate(&pThis->EventUrgRecv);
1592 AssertRCReturn(rc, rc);
1593
1594 rc = RTCritSectInit(&pThis->DevAccessLock);
1595 AssertRCReturn(rc, rc);
1596
1597 rc = RTCritSectInit(&pThis->XmitLock);
1598 AssertRCReturn(rc, rc);
1599
1600 char szTmp[128];
1601 RTStrPrintf(szTmp, sizeof(szTmp), "nat%d", pDrvIns->iInstance);
1602 PDMDrvHlpDBGFInfoRegister(pDrvIns, szTmp, "NAT info.", drvNATInfo);
1603
1604#ifndef RT_OS_WINDOWS
1605 /*
1606 * Create the control pipe.
1607 */
1608 rc = RTPipeCreate(&pThis->hPipeRead, &pThis->hPipeWrite, 0 /*fFlags*/);
1609 AssertRCReturn(rc, rc);
1610#else
1611 pThis->hWakeupEvent = CreateEvent(NULL, FALSE, FALSE, NULL); /* auto-reset event */
1612 slirp_register_external_event(pThis->pNATState, pThis->hWakeupEvent,
1613 VBOX_WAKEUP_EVENT_INDEX);
1614#endif
1615
1616 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pSlirpThread, pThis, drvNATAsyncIoThread,
1617 drvNATAsyncIoWakeup, 128 * _1K, RTTHREADTYPE_IO, "NAT");
1618 AssertRCReturn(rc, rc);
1619
1620 pThis->enmLinkState = pThis->enmLinkStateWant = PDMNETWORKLINKSTATE_UP;
1621
1622#ifdef RT_OS_DARWIN
1623 /* Set up a watcher which notifies us everytime the DNS server changes. */
1624 int rc2 = VINF_SUCCESS;
1625 SCDynamicStoreContext SCDynStorCtx;
1626
1627 SCDynStorCtx.version = 0;
1628 SCDynStorCtx.info = pThis;
1629 SCDynStorCtx.retain = NULL;
1630 SCDynStorCtx.release = NULL;
1631 SCDynStorCtx.copyDescription = NULL;
1632
1633 SCDynamicStoreRef hDynStor = SCDynamicStoreCreate(NULL, CFSTR("org.virtualbox.drvnat"), drvNatDnsChanged, &SCDynStorCtx);
1634 if (hDynStor)
1635 {
1636 CFRunLoopSourceRef hRunLoopSrc = SCDynamicStoreCreateRunLoopSource(NULL, hDynStor, 0);
1637 if (hRunLoopSrc)
1638 {
1639 CFStringRef aWatchKeys[] =
1640 {
1641 CFSTR("State:/Network/Global/DNS")
1642 };
1643 CFArrayRef hArray = CFArrayCreate(NULL, (const void **)aWatchKeys, 1, &kCFTypeArrayCallBacks);
1644
1645 if (hArray)
1646 {
1647 if (SCDynamicStoreSetNotificationKeys(hDynStor, hArray, NULL))
1648 {
1649 CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1650 CFRetain(hRunLoopMain);
1651 CFRunLoopAddSource(hRunLoopMain, hRunLoopSrc, kCFRunLoopCommonModes);
1652 CFRelease(hRunLoopMain);
1653 pThis->hRunLoopSrcDnsWatcher = hRunLoopSrc;
1654 }
1655 else
1656 rc2 = VERR_NO_MEMORY;
1657
1658 CFRelease(hArray);
1659 }
1660 else
1661 rc2 = VERR_NO_MEMORY;
1662
1663 if (RT_FAILURE(rc2)) /* Keep the runloop source referenced for destruction. */
1664 CFRelease(hRunLoopSrc);
1665 }
1666 CFRelease(hDynStor);
1667 }
1668 else
1669 rc2 = VERR_NO_MEMORY;
1670
1671 if (RT_FAILURE(rc2))
1672 LogRel(("NAT#%d: Failed to install DNS change notifier. The guest might loose DNS access when switching networks on the host\n",
1673 pDrvIns->iInstance));
1674#endif
1675
1676 /* might return VINF_NAT_DNS */
1677 return rc;
1678 }
1679
1680 /* failure path */
1681 slirp_term(pThis->pNATState);
1682 pThis->pNATState = NULL;
1683 }
1684 else
1685 {
1686 PDMDRV_SET_ERROR(pDrvIns, rc, N_("Unknown error during NAT networking setup: "));
1687 AssertMsgFailed(("Add error message for rc=%d (%Rrc)\n", rc, rc));
1688 }
1689
1690 return rc;
1691}
1692
1693
1694/**
1695 * NAT network transport driver registration record.
1696 */
1697const PDMDRVREG g_DrvNAT =
1698{
1699 /* u32Version */
1700 PDM_DRVREG_VERSION,
1701 /* szName */
1702 "NAT",
1703 /* szRCMod */
1704 "",
1705 /* szR0Mod */
1706 "",
1707 /* pszDescription */
1708 "NAT Network Transport Driver",
1709 /* fFlags */
1710 PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1711 /* fClass. */
1712 PDM_DRVREG_CLASS_NETWORK,
1713 /* cMaxInstances */
1714 ~0U,
1715 /* cbInstance */
1716 sizeof(DRVNAT),
1717 /* pfnConstruct */
1718 drvNATConstruct,
1719 /* pfnDestruct */
1720 drvNATDestruct,
1721 /* pfnRelocate */
1722 NULL,
1723 /* pfnIOCtl */
1724 NULL,
1725 /* pfnPowerOn */
1726 drvNATPowerOn,
1727 /* pfnReset */
1728 NULL,
1729 /* pfnSuspend */
1730 NULL,
1731 /* pfnResume */
1732 drvNATResume,
1733 /* pfnAttach */
1734 NULL,
1735 /* pfnDetach */
1736 NULL,
1737 /* pfnPowerOff */
1738 NULL,
1739 /* pfnSoftReset */
1740 NULL,
1741 /* u32EndVersion */
1742 PDM_DRVREG_VERSION
1743};
1744
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