VirtualBox

source: vbox/trunk/src/VBox/Devices/Network/DrvNAT.cpp@ 62511

Last change on this file since 62511 was 62511, checked in by vboxsync, 8 years ago

(C) 2016
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1/* $Id: DrvNAT.cpp 62511 2016-07-22 19:12:58Z vboxsync $ */
2/** @file
3 * DrvNAT - NAT network transport driver.
4 */
5
6/*
7 * Copyright (C) 2006-2016 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 */
17
18
19/*********************************************************************************************************************************
20* Header Files *
21*********************************************************************************************************************************/
22#define LOG_GROUP LOG_GROUP_DRV_NAT
23#define __STDC_LIMIT_MACROS
24#define __STDC_CONSTANT_MACROS
25#include "slirp/libslirp.h"
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 /** Request queue for the async host resolver. */
214 RTREQQUEUE hHostResQueue;
215 /** Async host resolver thread. */
216 PPDMTHREAD pHostResThread;
217
218#ifdef RT_OS_DARWIN
219 /* Handle of the DNS watcher runloop source. */
220 CFRunLoopSourceRef hRunLoopSrcDnsWatcher;
221#endif
222} DRVNAT;
223AssertCompileMemberAlignment(DRVNAT, StatNATRecvWakeups, 8);
224/** Pointer to the NAT driver instance data. */
225typedef DRVNAT *PDRVNAT;
226
227
228/*********************************************************************************************************************************
229* Internal Functions *
230*********************************************************************************************************************************/
231static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho);
232DECLINLINE(void) drvNATUpdateDNS(PDRVNAT pThis, bool fFlapLink);
233static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis);
234
235
236static DECLCALLBACK(int) drvNATRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
237{
238 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
239
240 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
241 return VINF_SUCCESS;
242
243 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
244 {
245 RTReqQueueProcess(pThis->hRecvReqQueue, 0);
246 if (ASMAtomicReadU32(&pThis->cPkts) == 0)
247 RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
248 }
249 return VINF_SUCCESS;
250}
251
252
253static DECLCALLBACK(int) drvNATRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
254{
255 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
256 int rc;
257 rc = RTSemEventSignal(pThis->EventRecv);
258
259 STAM_COUNTER_INC(&pThis->StatNATRecvWakeups);
260 return VINF_SUCCESS;
261}
262
263static DECLCALLBACK(int) drvNATUrgRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
264{
265 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
266
267 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
268 return VINF_SUCCESS;
269
270 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
271 {
272 RTReqQueueProcess(pThis->hUrgRecvReqQueue, 0);
273 if (ASMAtomicReadU32(&pThis->cUrgPkts) == 0)
274 {
275 int rc = RTSemEventWait(pThis->EventUrgRecv, RT_INDEFINITE_WAIT);
276 AssertRC(rc);
277 }
278 }
279 return VINF_SUCCESS;
280}
281
282static DECLCALLBACK(int) drvNATUrgRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
283{
284 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
285 int rc = RTSemEventSignal(pThis->EventUrgRecv);
286 AssertRC(rc);
287
288 return VINF_SUCCESS;
289}
290
291static DECLCALLBACK(void) drvNATUrgRecvWorker(PDRVNAT pThis, uint8_t *pu8Buf, int cb, struct mbuf *m)
292{
293 int rc = RTCritSectEnter(&pThis->DevAccessLock);
294 AssertRC(rc);
295 rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
296 if (RT_SUCCESS(rc))
297 {
298 rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
299 AssertRC(rc);
300 }
301 else if ( rc != VERR_TIMEOUT
302 && rc != VERR_INTERRUPTED)
303 {
304 AssertRC(rc);
305 }
306
307 rc = RTCritSectLeave(&pThis->DevAccessLock);
308 AssertRC(rc);
309
310 slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
311 if (ASMAtomicDecU32(&pThis->cUrgPkts) == 0)
312 {
313 drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
314 drvNATNotifyNATThread(pThis, "drvNATUrgRecvWorker");
315 }
316}
317
318
319static DECLCALLBACK(void) drvNATRecvWorker(PDRVNAT pThis, uint8_t *pu8Buf, int cb, struct mbuf *m)
320{
321 int rc;
322 STAM_PROFILE_START(&pThis->StatNATRecv, a);
323
324
325 while (ASMAtomicReadU32(&pThis->cUrgPkts) != 0)
326 {
327 rc = RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
328 if ( RT_FAILURE(rc)
329 && ( rc == VERR_TIMEOUT
330 || rc == VERR_INTERRUPTED))
331 goto done_unlocked;
332 }
333
334 rc = RTCritSectEnter(&pThis->DevAccessLock);
335 AssertRC(rc);
336
337 STAM_PROFILE_START(&pThis->StatNATRecvWait, b);
338 rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
339 STAM_PROFILE_STOP(&pThis->StatNATRecvWait, b);
340
341 if (RT_SUCCESS(rc))
342 {
343 rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
344 AssertRC(rc);
345 }
346 else if ( rc != VERR_TIMEOUT
347 && rc != VERR_INTERRUPTED)
348 {
349 AssertRC(rc);
350 }
351
352 rc = RTCritSectLeave(&pThis->DevAccessLock);
353 AssertRC(rc);
354
355done_unlocked:
356 slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
357 ASMAtomicDecU32(&pThis->cPkts);
358
359 drvNATNotifyNATThread(pThis, "drvNATRecvWorker");
360
361 STAM_PROFILE_STOP(&pThis->StatNATRecv, a);
362}
363
364/**
365 * Frees a S/G buffer allocated by drvNATNetworkUp_AllocBuf.
366 *
367 * @param pThis Pointer to the NAT instance.
368 * @param pSgBuf The S/G buffer to free.
369 */
370static void drvNATFreeSgBuf(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
371{
372 Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_MAGIC_MASK) == PDMSCATTERGATHER_FLAGS_MAGIC);
373 pSgBuf->fFlags = 0;
374 if (pSgBuf->pvAllocator)
375 {
376 Assert(!pSgBuf->pvUser);
377 slirp_ext_m_free(pThis->pNATState, (struct mbuf *)pSgBuf->pvAllocator, NULL);
378 pSgBuf->pvAllocator = NULL;
379 }
380 else if (pSgBuf->pvUser)
381 {
382 RTMemFree(pSgBuf->aSegs[0].pvSeg);
383 pSgBuf->aSegs[0].pvSeg = NULL;
384 RTMemFree(pSgBuf->pvUser);
385 pSgBuf->pvUser = NULL;
386 }
387 RTMemFree(pSgBuf);
388}
389
390/**
391 * Worker function for drvNATSend().
392 *
393 * @param pThis Pointer to the NAT instance.
394 * @param pSgBuf The scatter/gather buffer.
395 * @thread NAT
396 */
397static void drvNATSendWorker(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
398{
399#if 0 /* Assertion happens often to me after resuming a VM -- no time to investigate this now. */
400 Assert(pThis->enmLinkState == PDMNETWORKLINKSTATE_UP);
401#endif
402 if (pThis->enmLinkState == PDMNETWORKLINKSTATE_UP)
403 {
404 struct mbuf *m = (struct mbuf *)pSgBuf->pvAllocator;
405 if (m)
406 {
407 /*
408 * A normal frame.
409 */
410 pSgBuf->pvAllocator = NULL;
411 slirp_input(pThis->pNATState, m, pSgBuf->cbUsed);
412 }
413 else
414 {
415 /*
416 * GSO frame, need to segment it.
417 */
418 /** @todo Make the NAT engine grok large frames? Could be more efficient... */
419#if 0 /* this is for testing PDMNetGsoCarveSegmentQD. */
420 uint8_t abHdrScratch[256];
421#endif
422 uint8_t const *pbFrame = (uint8_t const *)pSgBuf->aSegs[0].pvSeg;
423 PCPDMNETWORKGSO pGso = (PCPDMNETWORKGSO)pSgBuf->pvUser;
424 uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, pSgBuf->cbUsed); Assert(cSegs > 1);
425 for (size_t iSeg = 0; iSeg < cSegs; iSeg++)
426 {
427 size_t cbSeg;
428 void *pvSeg;
429 m = slirp_ext_m_get(pThis->pNATState, pGso->cbHdrsTotal + pGso->cbMaxSeg, &pvSeg, &cbSeg);
430 if (!m)
431 break;
432
433#if 1
434 uint32_t cbPayload, cbHdrs;
435 uint32_t offPayload = PDMNetGsoCarveSegment(pGso, pbFrame, pSgBuf->cbUsed,
436 iSeg, cSegs, (uint8_t *)pvSeg, &cbHdrs, &cbPayload);
437 memcpy((uint8_t *)pvSeg + cbHdrs, pbFrame + offPayload, cbPayload);
438
439 slirp_input(pThis->pNATState, m, cbPayload + cbHdrs);
440#else
441 uint32_t cbSegFrame;
442 void *pvSegFrame = PDMNetGsoCarveSegmentQD(pGso, (uint8_t *)pbFrame, pSgBuf->cbUsed, abHdrScratch,
443 iSeg, cSegs, &cbSegFrame);
444 memcpy((uint8_t *)pvSeg, pvSegFrame, cbSegFrame);
445
446 slirp_input(pThis->pNATState, m, cbSegFrame);
447#endif
448 }
449 }
450 }
451 drvNATFreeSgBuf(pThis, pSgBuf);
452
453 /** @todo Implement the VERR_TRY_AGAIN drvNATNetworkUp_AllocBuf semantics. */
454}
455
456/**
457 * @interface_method_impl{PDMINETWORKUP,pfnBeginXmit}
458 */
459static DECLCALLBACK(int) drvNATNetworkUp_BeginXmit(PPDMINETWORKUP pInterface, bool fOnWorkerThread)
460{
461 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
462 int rc = RTCritSectTryEnter(&pThis->XmitLock);
463 if (RT_FAILURE(rc))
464 {
465 /** @todo Kick the worker thread when we have one... */
466 rc = VERR_TRY_AGAIN;
467 }
468 return rc;
469}
470
471/**
472 * @interface_method_impl{PDMINETWORKUP,pfnAllocBuf}
473 */
474static DECLCALLBACK(int) drvNATNetworkUp_AllocBuf(PPDMINETWORKUP pInterface, size_t cbMin,
475 PCPDMNETWORKGSO pGso, PPPDMSCATTERGATHER ppSgBuf)
476{
477 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
478 Assert(RTCritSectIsOwner(&pThis->XmitLock));
479
480 /*
481 * Drop the incoming frame if the NAT thread isn't running.
482 */
483 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
484 {
485 Log(("drvNATNetowrkUp_AllocBuf: returns VERR_NET_NO_NETWORK\n"));
486 return VERR_NET_NO_NETWORK;
487 }
488
489 /*
490 * Allocate a scatter/gather buffer and an mbuf.
491 */
492 PPDMSCATTERGATHER pSgBuf = (PPDMSCATTERGATHER)RTMemAlloc(sizeof(*pSgBuf));
493 if (!pSgBuf)
494 return VERR_NO_MEMORY;
495 if (!pGso)
496 {
497 /*
498 * Drop the frame if it is too big.
499 */
500 if (cbMin >= DRVNAT_MAXFRAMESIZE)
501 {
502 Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
503 cbMin));
504 RTMemFree(pSgBuf);
505 return VERR_INVALID_PARAMETER;
506 }
507
508 pSgBuf->pvUser = NULL;
509 pSgBuf->pvAllocator = slirp_ext_m_get(pThis->pNATState, cbMin,
510 &pSgBuf->aSegs[0].pvSeg, &pSgBuf->aSegs[0].cbSeg);
511 if (!pSgBuf->pvAllocator)
512 {
513 RTMemFree(pSgBuf);
514 return VERR_TRY_AGAIN;
515 }
516 }
517 else
518 {
519 /*
520 * Drop the frame if its segment is too big.
521 */
522 if (pGso->cbHdrsTotal + pGso->cbMaxSeg >= DRVNAT_MAXFRAMESIZE)
523 {
524 Log(("drvNATNetowrkUp_AllocBuf: drops over-sized frame (%u bytes), returns VERR_INVALID_PARAMETER\n",
525 pGso->cbHdrsTotal + pGso->cbMaxSeg));
526 RTMemFree(pSgBuf);
527 return VERR_INVALID_PARAMETER;
528 }
529
530 pSgBuf->pvUser = RTMemDup(pGso, sizeof(*pGso));
531 pSgBuf->pvAllocator = NULL;
532 pSgBuf->aSegs[0].cbSeg = RT_ALIGN_Z(cbMin, 16);
533 pSgBuf->aSegs[0].pvSeg = RTMemAlloc(pSgBuf->aSegs[0].cbSeg);
534 if (!pSgBuf->pvUser || !pSgBuf->aSegs[0].pvSeg)
535 {
536 RTMemFree(pSgBuf->aSegs[0].pvSeg);
537 RTMemFree(pSgBuf->pvUser);
538 RTMemFree(pSgBuf);
539 return VERR_TRY_AGAIN;
540 }
541 }
542
543 /*
544 * Initialize the S/G buffer and return.
545 */
546 pSgBuf->fFlags = PDMSCATTERGATHER_FLAGS_MAGIC | PDMSCATTERGATHER_FLAGS_OWNER_1;
547 pSgBuf->cbUsed = 0;
548 pSgBuf->cbAvailable = pSgBuf->aSegs[0].cbSeg;
549 pSgBuf->cSegs = 1;
550
551#if 0 /* poison */
552 memset(pSgBuf->aSegs[0].pvSeg, 'F', pSgBuf->aSegs[0].cbSeg);
553#endif
554 *ppSgBuf = pSgBuf;
555 return VINF_SUCCESS;
556}
557
558/**
559 * @interface_method_impl{PDMINETWORKUP,pfnFreeBuf}
560 */
561static DECLCALLBACK(int) drvNATNetworkUp_FreeBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf)
562{
563 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
564 Assert(RTCritSectIsOwner(&pThis->XmitLock));
565 drvNATFreeSgBuf(pThis, pSgBuf);
566 return VINF_SUCCESS;
567}
568
569/**
570 * @interface_method_impl{PDMINETWORKUP,pfnSendBuf}
571 */
572static DECLCALLBACK(int) drvNATNetworkUp_SendBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf, bool fOnWorkerThread)
573{
574 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
575 Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_OWNER_MASK) == PDMSCATTERGATHER_FLAGS_OWNER_1);
576 Assert(RTCritSectIsOwner(&pThis->XmitLock));
577
578 int rc;
579 if (pThis->pSlirpThread->enmState == PDMTHREADSTATE_RUNNING)
580 {
581 /* Set an FTM checkpoint as this operation changes the state permanently. */
582 PDMDrvHlpFTSetCheckpoint(pThis->pDrvIns, FTMCHECKPOINTTYPE_NETWORK);
583
584 rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, NULL /*ppReq*/, 0 /*cMillies*/,
585 RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
586 (PFNRT)drvNATSendWorker, 2, pThis, pSgBuf);
587 if (RT_SUCCESS(rc))
588 {
589 drvNATNotifyNATThread(pThis, "drvNATNetworkUp_SendBuf");
590 return VINF_SUCCESS;
591 }
592
593 rc = VERR_NET_NO_BUFFER_SPACE;
594 }
595 else
596 rc = VERR_NET_DOWN;
597 drvNATFreeSgBuf(pThis, pSgBuf);
598 return rc;
599}
600
601/**
602 * @interface_method_impl{PDMINETWORKUP,pfnEndXmit}
603 */
604static DECLCALLBACK(void) drvNATNetworkUp_EndXmit(PPDMINETWORKUP pInterface)
605{
606 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
607 RTCritSectLeave(&pThis->XmitLock);
608}
609
610/**
611 * Get the NAT thread out of poll/WSAWaitForMultipleEvents
612 */
613static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho)
614{
615 int rc;
616#ifndef RT_OS_WINDOWS
617 /* kick poll() */
618 size_t cbIgnored;
619 rc = RTPipeWrite(pThis->hPipeWrite, "", 1, &cbIgnored);
620#else
621 /* kick WSAWaitForMultipleEvents */
622 rc = WSASetEvent(pThis->hWakeupEvent);
623#endif
624 AssertRC(rc);
625}
626
627/**
628 * @interface_method_impl{PDMINETWORKUP,pfnSetPromiscuousMode}
629 */
630static DECLCALLBACK(void) drvNATNetworkUp_SetPromiscuousMode(PPDMINETWORKUP pInterface, bool fPromiscuous)
631{
632 LogFlow(("drvNATNetworkUp_SetPromiscuousMode: fPromiscuous=%d\n", fPromiscuous));
633 /* nothing to do */
634}
635
636/**
637 * Worker function for drvNATNetworkUp_NotifyLinkChanged().
638 * @thread "NAT" thread.
639 */
640static void drvNATNotifyLinkChangedWorker(PDRVNAT pThis, PDMNETWORKLINKSTATE enmLinkState)
641{
642 pThis->enmLinkState = pThis->enmLinkStateWant = enmLinkState;
643 switch (enmLinkState)
644 {
645 case PDMNETWORKLINKSTATE_UP:
646 LogRel(("NAT: Link up\n"));
647 slirp_link_up(pThis->pNATState);
648 break;
649
650 case PDMNETWORKLINKSTATE_DOWN:
651 case PDMNETWORKLINKSTATE_DOWN_RESUME:
652 LogRel(("NAT: Link down\n"));
653 slirp_link_down(pThis->pNATState);
654 break;
655
656 default:
657 AssertMsgFailed(("drvNATNetworkUp_NotifyLinkChanged: unexpected link state %d\n", enmLinkState));
658 }
659}
660
661/**
662 * Notification on link status changes.
663 *
664 * @param pInterface Pointer to the interface structure containing the called function pointer.
665 * @param enmLinkState The new link state.
666 * @thread EMT
667 */
668static DECLCALLBACK(void) drvNATNetworkUp_NotifyLinkChanged(PPDMINETWORKUP pInterface, PDMNETWORKLINKSTATE enmLinkState)
669{
670 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
671
672 LogFlow(("drvNATNetworkUp_NotifyLinkChanged: enmLinkState=%d\n", enmLinkState));
673
674 /* Don't queue new requests if the NAT thread is not running (e.g. paused,
675 * stopping), otherwise we would deadlock. Memorize the change. */
676 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
677 {
678 pThis->enmLinkStateWant = enmLinkState;
679 return;
680 }
681
682 PRTREQ pReq;
683 int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /*cMillies*/, RTREQFLAGS_VOID,
684 (PFNRT)drvNATNotifyLinkChangedWorker, 2, pThis, enmLinkState);
685 if (rc == VERR_TIMEOUT)
686 {
687 drvNATNotifyNATThread(pThis, "drvNATNetworkUp_NotifyLinkChanged");
688 rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
689 AssertRC(rc);
690 }
691 else
692 AssertRC(rc);
693 RTReqRelease(pReq);
694}
695
696static void drvNATNotifyApplyPortForwardCommand(PDRVNAT pThis, bool fRemove,
697 bool fUdp, const char *pHostIp,
698 uint16_t u16HostPort, const char *pGuestIp, uint16_t u16GuestPort)
699{
700 struct in_addr guestIp, hostIp;
701
702 if ( pHostIp == NULL
703 || inet_aton(pHostIp, &hostIp) == 0)
704 hostIp.s_addr = INADDR_ANY;
705
706 if ( pGuestIp == NULL
707 || inet_aton(pGuestIp, &guestIp) == 0)
708 guestIp.s_addr = pThis->GuestIP;
709
710 if (fRemove)
711 slirp_remove_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
712 else
713 slirp_add_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
714}
715
716static DECLCALLBACK(int) drvNATNetworkNatConfigRedirect(PPDMINETWORKNATCONFIG pInterface, bool fRemove,
717 bool fUdp, const char *pHostIp, uint16_t u16HostPort,
718 const char *pGuestIp, uint16_t u16GuestPort)
719{
720 LogFlowFunc(("fRemove=%d, fUdp=%d, pHostIp=%s, u16HostPort=%u, pGuestIp=%s, u16GuestPort=%u\n",
721 RT_BOOL(fRemove), RT_BOOL(fUdp), pHostIp, u16HostPort, pGuestIp, u16GuestPort));
722 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
723 /* Execute the command directly if the VM is not running. */
724 int rc;
725 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
726 {
727 drvNATNotifyApplyPortForwardCommand(pThis, fRemove, fUdp, pHostIp,
728 u16HostPort, pGuestIp,u16GuestPort);
729 rc = VINF_SUCCESS;
730 }
731 else
732 {
733 PRTREQ pReq;
734 rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /*cMillies*/, RTREQFLAGS_VOID,
735 (PFNRT)drvNATNotifyApplyPortForwardCommand, 7, pThis, fRemove,
736 fUdp, pHostIp, u16HostPort, pGuestIp, u16GuestPort);
737 if (rc == VERR_TIMEOUT)
738 {
739 drvNATNotifyNATThread(pThis, "drvNATNetworkNatConfigRedirect");
740 rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
741 AssertRC(rc);
742 }
743 else
744 AssertRC(rc);
745
746 RTReqRelease(pReq);
747 }
748 return rc;
749}
750
751/**
752 * NAT thread handling the slirp stuff.
753 *
754 * The slirp implementation is single-threaded so we execute this enginre in a
755 * dedicated thread. We take care that this thread does not become the
756 * bottleneck: If the guest wants to send, a request is enqueued into the
757 * hSlirpReqQueue and handled asynchronously by this thread. If this thread
758 * wants to deliver packets to the guest, it enqueues a request into
759 * hRecvReqQueue which is later handled by the Recv thread.
760 */
761static DECLCALLBACK(int) drvNATAsyncIoThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
762{
763 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
764 int nFDs = -1;
765#ifdef RT_OS_WINDOWS
766 HANDLE *phEvents = slirp_get_events(pThis->pNATState);
767 unsigned int cBreak = 0;
768#else /* RT_OS_WINDOWS */
769 unsigned int cPollNegRet = 0;
770#endif /* !RT_OS_WINDOWS */
771
772 LogFlow(("drvNATAsyncIoThread: pThis=%p\n", pThis));
773
774 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
775 return VINF_SUCCESS;
776
777 if (pThis->enmLinkStateWant != pThis->enmLinkState)
778 drvNATNotifyLinkChangedWorker(pThis, pThis->enmLinkStateWant);
779
780 /*
781 * Polling loop.
782 */
783 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
784 {
785 /*
786 * To prevent concurrent execution of sending/receiving threads
787 */
788#ifndef RT_OS_WINDOWS
789 nFDs = slirp_get_nsock(pThis->pNATState);
790 /* allocation for all sockets + Management pipe */
791 struct pollfd *polls = (struct pollfd *)RTMemAlloc((1 + nFDs) * sizeof(struct pollfd) + sizeof(uint32_t));
792 if (polls == NULL)
793 return VERR_NO_MEMORY;
794
795 /* don't pass the management pipe */
796 slirp_select_fill(pThis->pNATState, &nFDs, &polls[1]);
797
798 polls[0].fd = RTPipeToNative(pThis->hPipeRead);
799 /* POLLRDBAND usually doesn't used on Linux but seems used on Solaris */
800 polls[0].events = POLLRDNORM | POLLPRI | POLLRDBAND;
801 polls[0].revents = 0;
802
803 int cChangedFDs = poll(polls, nFDs + 1, slirp_get_timeout_ms(pThis->pNATState));
804 if (cChangedFDs < 0)
805 {
806 if (errno == EINTR)
807 {
808 Log2(("NAT: signal was caught while sleep on poll\n"));
809 /* No error, just process all outstanding requests but don't wait */
810 cChangedFDs = 0;
811 }
812 else if (cPollNegRet++ > 128)
813 {
814 LogRel(("NAT: Poll returns (%s) suppressed %d\n", strerror(errno), cPollNegRet));
815 cPollNegRet = 0;
816 }
817 }
818
819 if (cChangedFDs >= 0)
820 {
821 slirp_select_poll(pThis->pNATState, &polls[1], nFDs);
822 if (polls[0].revents & (POLLRDNORM|POLLPRI|POLLRDBAND))
823 {
824 /* drain the pipe
825 *
826 * Note! drvNATSend decoupled so we don't know how many times
827 * device's thread sends before we've entered multiplex,
828 * so to avoid false alarm drain pipe here to the very end
829 *
830 * @todo: Probably we should counter drvNATSend to count how
831 * deep pipe has been filed before drain.
832 *
833 */
834 /** @todo XXX: Make it reading exactly we need to drain the
835 * pipe.*/
836 char ch;
837 size_t cbRead;
838 RTPipeRead(pThis->hPipeRead, &ch, 1, &cbRead);
839 }
840 }
841 /* process _all_ outstanding requests but don't wait */
842 RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
843 RTMemFree(polls);
844
845#else /* RT_OS_WINDOWS */
846 nFDs = -1;
847 slirp_select_fill(pThis->pNATState, &nFDs);
848 DWORD dwEvent = WSAWaitForMultipleEvents(nFDs, phEvents, FALSE,
849 slirp_get_timeout_ms(pThis->pNATState),
850 /* :fAlertable */ TRUE);
851 if ( (dwEvent < WSA_WAIT_EVENT_0 || dwEvent > WSA_WAIT_EVENT_0 + nFDs - 1)
852 && dwEvent != WSA_WAIT_TIMEOUT && dwEvent != WSA_WAIT_IO_COMPLETION)
853 {
854 int error = WSAGetLastError();
855 LogRel(("NAT: WSAWaitForMultipleEvents returned %d (error %d)\n", dwEvent, error));
856 RTAssertPanic();
857 }
858
859 if (dwEvent == WSA_WAIT_TIMEOUT)
860 {
861 /* only check for slow/fast timers */
862 slirp_select_poll(pThis->pNATState, /* fTimeout=*/true);
863 continue;
864 }
865 /* poll the sockets in any case */
866 Log2(("%s: poll\n", __FUNCTION__));
867 slirp_select_poll(pThis->pNATState, /* fTimeout=*/false);
868 /* process _all_ outstanding requests but don't wait */
869 RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
870# ifdef VBOX_NAT_DELAY_HACK
871 if (cBreak++ > 128)
872 {
873 cBreak = 0;
874 RTThreadSleep(2);
875 }
876# endif
877#endif /* RT_OS_WINDOWS */
878 }
879
880 return VINF_SUCCESS;
881}
882
883
884/**
885 * Unblock the send thread so it can respond to a state change.
886 *
887 * @returns VBox status code.
888 * @param pDevIns The pcnet device instance.
889 * @param pThread The send thread.
890 */
891static DECLCALLBACK(int) drvNATAsyncIoWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
892{
893 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
894
895 drvNATNotifyNATThread(pThis, "drvNATAsyncIoWakeup");
896 return VINF_SUCCESS;
897}
898
899
900static DECLCALLBACK(int) drvNATHostResThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
901{
902 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
903
904 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
905 return VINF_SUCCESS;
906
907 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
908 {
909 RTReqQueueProcess(pThis->hHostResQueue, RT_INDEFINITE_WAIT);
910 }
911
912 return VINF_SUCCESS;
913}
914
915
916static DECLCALLBACK(int) drvNATReqQueueInterrupt()
917{
918 /*
919 * RTReqQueueProcess loops until request returns a warning or info
920 * status code (other than VINF_SUCCESS).
921 */
922 return VINF_INTERRUPTED;
923}
924
925
926static DECLCALLBACK(int) drvNATHostResWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
927{
928 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
929 Assert(pThis != NULL);
930
931 int rc;
932 rc = RTReqQueueCallEx(pThis->hHostResQueue, NULL /*ppReq*/, 0 /*cMillies*/,
933 RTREQFLAGS_IPRT_STATUS | RTREQFLAGS_NO_WAIT,
934 (PFNRT)drvNATReqQueueInterrupt, 0);
935 return rc;
936}
937
938
939/**
940 * Function called by slirp to check if it's possible to feed incoming data to the network port.
941 * @returns 1 if possible.
942 * @returns 0 if not possible.
943 */
944int slirp_can_output(void *pvUser)
945{
946 return 1;
947}
948
949void slirp_push_recv_thread(void *pvUser)
950{
951 PDRVNAT pThis = (PDRVNAT)pvUser;
952 Assert(pThis);
953 drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
954}
955
956void slirp_urg_output(void *pvUser, struct mbuf *m, const uint8_t *pu8Buf, int cb)
957{
958 PDRVNAT pThis = (PDRVNAT)pvUser;
959 Assert(pThis);
960
961 PRTREQ pReq = NULL;
962
963 /* don't queue new requests when the NAT thread is about to stop */
964 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
965 return;
966
967 ASMAtomicIncU32(&pThis->cUrgPkts);
968 int rc = RTReqQueueCallEx(pThis->hUrgRecvReqQueue, NULL /*ppReq*/, 0 /*cMillies*/, RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
969 (PFNRT)drvNATUrgRecvWorker, 4, pThis, pu8Buf, cb, m);
970 AssertRC(rc);
971 drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
972}
973
974/**
975 * Function called by slirp to wake up device after VERR_TRY_AGAIN
976 */
977void slirp_output_pending(void *pvUser)
978{
979 PDRVNAT pThis = (PDRVNAT)pvUser;
980 Assert(pThis);
981 LogFlowFuncEnter();
982 pThis->pIAboveNet->pfnXmitPending(pThis->pIAboveNet);
983 LogFlowFuncLeave();
984}
985
986/**
987 * Function called by slirp to feed incoming data to the NIC.
988 */
989void slirp_output(void *pvUser, struct mbuf *m, const uint8_t *pu8Buf, int cb)
990{
991 PDRVNAT pThis = (PDRVNAT)pvUser;
992 Assert(pThis);
993
994 LogFlow(("slirp_output BEGIN %p %d\n", pu8Buf, cb));
995 Log6(("slirp_output: pu8Buf=%p cb=%#x (pThis=%p)\n%.*Rhxd\n", pu8Buf, cb, pThis, cb, pu8Buf));
996
997 PRTREQ pReq = NULL;
998
999 /* don't queue new requests when the NAT thread is about to stop */
1000 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
1001 return;
1002
1003 ASMAtomicIncU32(&pThis->cPkts);
1004 int rc = RTReqQueueCallEx(pThis->hRecvReqQueue, NULL /*ppReq*/, 0 /*cMillies*/, RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
1005 (PFNRT)drvNATRecvWorker, 4, pThis, pu8Buf, cb, m);
1006 AssertRC(rc);
1007 drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
1008 STAM_COUNTER_INC(&pThis->StatQueuePktSent);
1009 LogFlowFuncLeave();
1010}
1011
1012
1013/*
1014 * Call a function on the slirp thread.
1015 */
1016int slirp_call(void *pvUser, PRTREQ *ppReq, RTMSINTERVAL cMillies,
1017 unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
1018{
1019 PDRVNAT pThis = (PDRVNAT)pvUser;
1020 Assert(pThis);
1021
1022 int rc;
1023
1024 va_list va;
1025 va_start(va, cArgs);
1026
1027 rc = RTReqQueueCallV(pThis->hSlirpReqQueue, ppReq, cMillies, fFlags, pfnFunction, cArgs, va);
1028
1029 va_end(va);
1030
1031 if (RT_SUCCESS(rc))
1032 drvNATNotifyNATThread(pThis, "slirp_vcall");
1033
1034 return rc;
1035}
1036
1037
1038/*
1039 * Call a function on the host resolver thread.
1040 */
1041int slirp_call_hostres(void *pvUser, PRTREQ *ppReq, RTMSINTERVAL cMillies,
1042 unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
1043{
1044 PDRVNAT pThis = (PDRVNAT)pvUser;
1045 Assert(pThis);
1046
1047 int rc;
1048
1049 AssertReturn((pThis->hHostResQueue != NIL_RTREQQUEUE), VERR_INVALID_STATE);
1050 AssertReturn((pThis->pHostResThread != NULL), VERR_INVALID_STATE);
1051
1052 va_list va;
1053 va_start(va, cArgs);
1054
1055 rc = RTReqQueueCallV(pThis->hHostResQueue, ppReq, cMillies, fFlags,
1056 pfnFunction, cArgs, va);
1057
1058 va_end(va);
1059 return rc;
1060}
1061
1062
1063/**
1064 * @interface_method_impl{PDMINETWORKNATCONFIG,pfnNotifyDnsChanged}
1065 *
1066 * We are notified that host's resolver configuration has changed. In
1067 * the current setup we don't get any details and just reread that
1068 * information ourselves.
1069 */
1070static DECLCALLBACK(void) drvNATNotifyDnsChanged(PPDMINETWORKNATCONFIG pInterface)
1071{
1072 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
1073 drvNATUpdateDNS(pThis, /* fFlapLink */ true);
1074}
1075
1076
1077#ifdef RT_OS_DARWIN
1078/**
1079 * Callback for the SystemConfiguration framework to notify us whenever the DNS
1080 * server changes.
1081 *
1082 * @returns nothing.
1083 * @param hDynStor The DynamicStore handle.
1084 * @param hChangedKey Array of changed keys we watch for.
1085 * @param pvUser Opaque user data (NAT driver instance).
1086 */
1087static DECLCALLBACK(void) drvNatDnsChanged(SCDynamicStoreRef hDynStor, CFArrayRef hChangedKeys, void *pvUser)
1088{
1089 PDRVNAT pThis = (PDRVNAT)pvUser;
1090
1091 Log2(("NAT: System configuration has changed\n"));
1092
1093 /* Check if any of parameters we are interested in were actually changed. If the size
1094 * of hChangedKeys is 0, it means that SCDynamicStore has been restarted. */
1095 if (hChangedKeys && CFArrayGetCount(hChangedKeys) > 0)
1096 {
1097 /* Look to the updated parameters in particular. */
1098 CFStringRef pDNSKey = CFSTR("State:/Network/Global/DNS");
1099
1100 if (CFArrayContainsValue(hChangedKeys, CFRangeMake(0, CFArrayGetCount(hChangedKeys)), pDNSKey))
1101 {
1102 LogRel(("NAT: DNS servers changed, triggering reconnect\n"));
1103#if 0
1104 CFDictionaryRef hDnsDict = (CFDictionaryRef)SCDynamicStoreCopyValue(hDynStor, pDNSKey);
1105 if (hDnsDict)
1106 {
1107 CFArrayRef hArrAddresses = (CFArrayRef)CFDictionaryGetValue(hDnsDict, kSCPropNetDNSServerAddresses);
1108 if (hArrAddresses && CFArrayGetCount(hArrAddresses) > 0)
1109 {
1110 /* Dump DNS servers list. */
1111 for (int i = 0; i < CFArrayGetCount(hArrAddresses); i++)
1112 {
1113 CFStringRef pDNSAddrStr = (CFStringRef)CFArrayGetValueAtIndex(hArrAddresses, i);
1114 const char *pszDNSAddr = pDNSAddrStr ? CFStringGetCStringPtr(pDNSAddrStr, CFStringGetSystemEncoding()) : NULL;
1115 LogRel(("NAT: New DNS server#%d: %s\n", i, pszDNSAddr ? pszDNSAddr : "None"));
1116 }
1117 }
1118 else
1119 LogRel(("NAT: DNS server list is empty (1)\n"));
1120
1121 CFRelease(hDnsDict);
1122 }
1123 else
1124 LogRel(("NAT: DNS server list is empty (2)\n"));
1125#endif
1126 drvNATUpdateDNS(pThis, /* fFlapLink */ true);
1127 }
1128 else
1129 Log2(("NAT: No DNS changes detected\n"));
1130 }
1131 else
1132 Log2(("NAT: SCDynamicStore has been restarted\n"));
1133}
1134#endif
1135
1136/**
1137 * @interface_method_impl{PDMIBASE,pfnQueryInterface}
1138 */
1139static DECLCALLBACK(void *) drvNATQueryInterface(PPDMIBASE pInterface, const char *pszIID)
1140{
1141 PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
1142 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1143
1144 PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
1145 PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKUP, &pThis->INetworkUp);
1146 PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKNATCONFIG, &pThis->INetworkNATCfg);
1147 return NULL;
1148}
1149
1150
1151/**
1152 * Get the MAC address into the slirp stack.
1153 *
1154 * Called by drvNATLoadDone and drvNATPowerOn.
1155 */
1156static void drvNATSetMac(PDRVNAT pThis)
1157{
1158#if 0 /* XXX: do we still need this for anything? */
1159 if (pThis->pIAboveConfig)
1160 {
1161 RTMAC Mac;
1162 pThis->pIAboveConfig->pfnGetMac(pThis->pIAboveConfig, &Mac);
1163 }
1164#endif
1165}
1166
1167
1168/**
1169 * After loading we have to pass the MAC address of the ethernet device to the slirp stack.
1170 * Otherwise the guest is not reachable until it performs a DHCP request or an ARP request
1171 * (usually done during guest boot).
1172 */
1173static DECLCALLBACK(int) drvNATLoadDone(PPDMDRVINS pDrvIns, PSSMHANDLE pSSMHandle)
1174{
1175 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1176 drvNATSetMac(pThis);
1177 return VINF_SUCCESS;
1178}
1179
1180
1181/**
1182 * Some guests might not use DHCP to retrieve an IP but use a static IP.
1183 */
1184static DECLCALLBACK(void) drvNATPowerOn(PPDMDRVINS pDrvIns)
1185{
1186 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1187 drvNATSetMac(pThis);
1188}
1189
1190
1191/**
1192 * @interface_method_impl{PDMDEVREG,pfnResume}
1193 */
1194static DECLCALLBACK(void) drvNATResume(PPDMDRVINS pDrvIns)
1195{
1196 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1197 VMRESUMEREASON enmReason = PDMDrvHlpVMGetResumeReason(pDrvIns);
1198
1199 switch (enmReason)
1200 {
1201 case VMRESUMEREASON_HOST_RESUME:
1202 bool fFlapLink;
1203#if HAVE_NOTIFICATION_FOR_DNS_UPDATE
1204 /* let event handler do it if necessary */
1205 fFlapLink = false;
1206#else
1207 /* XXX: when in doubt, use brute force */
1208 fFlapLink = true;
1209#endif
1210 drvNATUpdateDNS(pThis, fFlapLink);
1211 return;
1212 default: /* Ignore every other resume reason. */
1213 /* do nothing */
1214 return;
1215 }
1216}
1217
1218
1219static DECLCALLBACK(int) drvNATReinitializeHostNameResolving(PDRVNAT pThis)
1220{
1221 slirpReleaseDnsSettings(pThis->pNATState);
1222 slirpInitializeDnsSettings(pThis->pNATState);
1223 return VINF_SUCCESS;
1224}
1225
1226/**
1227 * This function at this stage could be called from two places, but both from non-NAT thread,
1228 * - drvNATResume (EMT?)
1229 * - drvNatDnsChanged (darwin, GUI or main) "listener"
1230 * When Main's interface IHost will support host network configuration change event on every host,
1231 * we won't call it from drvNATResume, but from listener of Main event in the similar way it done
1232 * for port-forwarding, and it wan't be on GUI/main thread, but on EMT thread only.
1233 *
1234 * Thread here is important, because we need to change DNS server list and domain name (+ perhaps,
1235 * search string) at runtime (VBOX_NAT_ENFORCE_INTERNAL_DNS_UPDATE), we can do it safely on NAT thread,
1236 * so with changing other variables (place where we handle update) the main mechanism of update
1237 * _won't_ be changed, the only thing will change is drop of fFlapLink parameter.
1238 */
1239DECLINLINE(void) drvNATUpdateDNS(PDRVNAT pThis, bool fFlapLink)
1240{
1241 int strategy = slirp_host_network_configuration_change_strategy_selector(pThis->pNATState);
1242 switch (strategy)
1243 {
1244 case VBOX_NAT_DNS_DNSPROXY:
1245 {
1246 /**
1247 * XXX: Here or in _strategy_selector we should deal with network change
1248 * in "network change" scenario domain name change we have to update guest lease
1249 * forcibly.
1250 * Note at that built-in dhcp also updates DNS information on NAT thread.
1251 */
1252 /**
1253 * It's unsafe to to do it directly on non-NAT thread
1254 * so we schedule the worker and kick the NAT thread.
1255 */
1256 int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, NULL /*ppReq*/, 0 /*cMillies*/,
1257 RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
1258 (PFNRT)drvNATReinitializeHostNameResolving, 1, pThis);
1259 if (RT_SUCCESS(rc))
1260 drvNATNotifyNATThread(pThis, "drvNATUpdateDNS");
1261
1262 return;
1263 }
1264
1265 case VBOX_NAT_DNS_EXTERNAL:
1266 /*
1267 * Host resumed from a suspend and the network might have changed.
1268 * Disconnect the guest from the network temporarily to let it pick up the changes.
1269 */
1270 if (fFlapLink)
1271 pThis->pIAboveConfig->pfnSetLinkState(pThis->pIAboveConfig,
1272 PDMNETWORKLINKSTATE_DOWN_RESUME);
1273 return;
1274
1275 case VBOX_NAT_DNS_HOSTRESOLVER:
1276 default:
1277 return;
1278 }
1279}
1280
1281
1282/**
1283 * Info handler.
1284 */
1285static DECLCALLBACK(void) drvNATInfo(PPDMDRVINS pDrvIns, PCDBGFINFOHLP pHlp, const char *pszArgs)
1286{
1287 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1288 slirp_info(pThis->pNATState, pHlp, pszArgs);
1289}
1290
1291#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1292static int drvNATConstructDNSMappings(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pMappingsCfg)
1293{
1294 int rc = VINF_SUCCESS;
1295 LogFlowFunc(("ENTER: iInstance:%d\n", iInstance));
1296 for (PCFGMNODE pNode = CFGMR3GetFirstChild(pMappingsCfg); pNode; pNode = CFGMR3GetNextChild(pNode))
1297 {
1298 if (!CFGMR3AreValuesValid(pNode, "HostName\0HostNamePattern\0HostIP\0"))
1299 return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1300 N_("Unknown configuration in dns mapping"));
1301 char szHostNameOrPattern[255];
1302 bool fPattern = false;
1303 RT_ZERO(szHostNameOrPattern);
1304 GET_STRING(rc, pThis, pNode, "HostName", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1305 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1306 {
1307 GET_STRING(rc, pThis, pNode, "HostNamePattern", szHostNameOrPattern[0], sizeof(szHostNameOrPattern));
1308 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1309 {
1310 char szNodeName[225];
1311 RT_ZERO(szNodeName);
1312 CFGMR3GetName(pNode, szNodeName, sizeof(szNodeName));
1313 LogRel(("NAT: Neither 'HostName' nor 'HostNamePattern' is specified for mapping %s\n", szNodeName));
1314 continue;
1315 }
1316 fPattern = true;
1317 }
1318 struct in_addr HostIP;
1319 GETIP_DEF(rc, pThis, pNode, HostIP, INADDR_ANY);
1320 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1321 {
1322 LogRel(("NAT: DNS mapping %s is ignored (address not pointed)\n", szHostNameOrPattern));
1323 continue;
1324 }
1325 slirp_add_host_resolver_mapping(pThis->pNATState, szHostNameOrPattern, fPattern, HostIP.s_addr);
1326 }
1327 LogFlowFunc(("LEAVE: %Rrc\n", rc));
1328 return rc;
1329}
1330#endif /* !VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER */
1331
1332
1333/**
1334 * Sets up the redirectors.
1335 *
1336 * @returns VBox status code.
1337 * @param pCfg The configuration handle.
1338 */
1339static int drvNATConstructRedir(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pCfg, PRTNETADDRIPV4 pNetwork)
1340{
1341 /*
1342 * Enumerate redirections.
1343 */
1344 for (PCFGMNODE pNode = CFGMR3GetFirstChild(pCfg); pNode; pNode = CFGMR3GetNextChild(pNode))
1345 {
1346#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1347 char szNodeName[32];
1348 CFGMR3GetName(pNode, szNodeName, 32);
1349 if ( !RTStrICmp(szNodeName, "HostResolverMappings")
1350 || !RTStrICmp(szNodeName, "AttachedDriver"))
1351 continue;
1352#endif
1353 /*
1354 * Validate the port forwarding config.
1355 */
1356 if (!CFGMR3AreValuesValid(pNode, "Protocol\0UDP\0HostPort\0GuestPort\0GuestIP\0BindIP\0"))
1357 return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1358 N_("Unknown configuration in port forwarding"));
1359
1360 /* protocol type */
1361 bool fUDP;
1362 char szProtocol[32];
1363 int rc;
1364 GET_STRING(rc, pThis, pNode, "Protocol", szProtocol[0], sizeof(szProtocol));
1365 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1366 {
1367 fUDP = false;
1368 GET_BOOL(rc, pThis, pNode, "UDP", fUDP);
1369 }
1370 else if (RT_SUCCESS(rc))
1371 {
1372 if (!RTStrICmp(szProtocol, "TCP"))
1373 fUDP = false;
1374 else if (!RTStrICmp(szProtocol, "UDP"))
1375 fUDP = true;
1376 else
1377 return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
1378 N_("NAT#%d: Invalid configuration value for \"Protocol\": \"%s\""),
1379 iInstance, szProtocol);
1380 }
1381 else
1382 return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS,
1383 N_("NAT#%d: configuration query for \"Protocol\" failed"),
1384 iInstance);
1385 /* host port */
1386 int32_t iHostPort;
1387 GET_S32_STRICT(rc, pThis, pNode, "HostPort", iHostPort);
1388
1389 /* guest port */
1390 int32_t iGuestPort;
1391 GET_S32_STRICT(rc, pThis, pNode, "GuestPort", iGuestPort);
1392
1393 /* host address ("BindIP" name is rather unfortunate given "HostPort" to go with it) */
1394 struct in_addr BindIP;
1395 GETIP_DEF(rc, pThis, pNode, BindIP, INADDR_ANY);
1396
1397 /* guest address */
1398 struct in_addr GuestIP;
1399 GETIP_DEF(rc, pThis, pNode, GuestIP, INADDR_ANY);
1400
1401 /*
1402 * Call slirp about it.
1403 */
1404 if (slirp_add_redirect(pThis->pNATState, fUDP, BindIP, iHostPort, GuestIP, iGuestPort) < 0)
1405 return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_SETUP, RT_SRC_POS,
1406 N_("NAT#%d: configuration error: failed to set up "
1407 "redirection of %d to %d. Probably a conflict with "
1408 "existing services or other rules"), iInstance, iHostPort,
1409 iGuestPort);
1410 } /* for each redir rule */
1411
1412 return VINF_SUCCESS;
1413}
1414
1415
1416/**
1417 * Destruct a driver instance.
1418 *
1419 * Most VM resources are freed by the VM. This callback is provided so that any non-VM
1420 * resources can be freed correctly.
1421 *
1422 * @param pDrvIns The driver instance data.
1423 */
1424static DECLCALLBACK(void) drvNATDestruct(PPDMDRVINS pDrvIns)
1425{
1426 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1427 LogFlow(("drvNATDestruct:\n"));
1428 PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
1429
1430 if (pThis->pNATState)
1431 {
1432 slirp_term(pThis->pNATState);
1433 slirp_deregister_statistics(pThis->pNATState, pDrvIns);
1434#ifdef VBOX_WITH_STATISTICS
1435# define DRV_PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1436# define DRV_COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1437# include "counters.h"
1438#endif
1439 pThis->pNATState = NULL;
1440 }
1441
1442 RTReqQueueDestroy(pThis->hHostResQueue);
1443 pThis->hHostResQueue = NIL_RTREQQUEUE;
1444
1445 RTReqQueueDestroy(pThis->hSlirpReqQueue);
1446 pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1447
1448 RTReqQueueDestroy(pThis->hUrgRecvReqQueue);
1449 pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1450
1451 RTSemEventDestroy(pThis->EventRecv);
1452 pThis->EventRecv = NIL_RTSEMEVENT;
1453
1454 RTSemEventDestroy(pThis->EventUrgRecv);
1455 pThis->EventUrgRecv = NIL_RTSEMEVENT;
1456
1457 if (RTCritSectIsInitialized(&pThis->DevAccessLock))
1458 RTCritSectDelete(&pThis->DevAccessLock);
1459
1460 if (RTCritSectIsInitialized(&pThis->XmitLock))
1461 RTCritSectDelete(&pThis->XmitLock);
1462
1463#ifdef RT_OS_DARWIN
1464 /* Cleanup the DNS watcher. */
1465 CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1466 CFRetain(hRunLoopMain);
1467 CFRunLoopRemoveSource(hRunLoopMain, pThis->hRunLoopSrcDnsWatcher, kCFRunLoopCommonModes);
1468 CFRelease(hRunLoopMain);
1469 CFRelease(pThis->hRunLoopSrcDnsWatcher);
1470 pThis->hRunLoopSrcDnsWatcher = NULL;
1471#endif
1472}
1473
1474
1475/**
1476 * Construct a NAT network transport driver instance.
1477 *
1478 * @copydoc FNPDMDRVCONSTRUCT
1479 */
1480static DECLCALLBACK(int) drvNATConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
1481{
1482 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1483 LogFlow(("drvNATConstruct:\n"));
1484 PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
1485
1486 /*
1487 * Init the static parts.
1488 */
1489 pThis->pDrvIns = pDrvIns;
1490 pThis->pNATState = NULL;
1491 pThis->pszTFTPPrefix = NULL;
1492 pThis->pszBootFile = NULL;
1493 pThis->pszNextServer = NULL;
1494 pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1495 pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1496 pThis->hHostResQueue = NIL_RTREQQUEUE;
1497 pThis->EventRecv = NIL_RTSEMEVENT;
1498 pThis->EventUrgRecv = NIL_RTSEMEVENT;
1499#ifdef RT_OS_DARWIN
1500 pThis->hRunLoopSrcDnsWatcher = NULL;
1501#endif
1502
1503 /* IBase */
1504 pDrvIns->IBase.pfnQueryInterface = drvNATQueryInterface;
1505
1506 /* INetwork */
1507 pThis->INetworkUp.pfnBeginXmit = drvNATNetworkUp_BeginXmit;
1508 pThis->INetworkUp.pfnAllocBuf = drvNATNetworkUp_AllocBuf;
1509 pThis->INetworkUp.pfnFreeBuf = drvNATNetworkUp_FreeBuf;
1510 pThis->INetworkUp.pfnSendBuf = drvNATNetworkUp_SendBuf;
1511 pThis->INetworkUp.pfnEndXmit = drvNATNetworkUp_EndXmit;
1512 pThis->INetworkUp.pfnSetPromiscuousMode = drvNATNetworkUp_SetPromiscuousMode;
1513 pThis->INetworkUp.pfnNotifyLinkChanged = drvNATNetworkUp_NotifyLinkChanged;
1514
1515 /* NAT engine configuration */
1516 pThis->INetworkNATCfg.pfnRedirectRuleCommand = drvNATNetworkNatConfigRedirect;
1517#if HAVE_NOTIFICATION_FOR_DNS_UPDATE && !defined(RT_OS_DARWIN)
1518 /*
1519 * On OS X we stick to the old OS X specific notifications for
1520 * now. Elsewhere use IHostNameResolutionConfigurationChangeEvent
1521 * by enbaling HAVE_NOTIFICATION_FOR_DNS_UPDATE in libslirp.h.
1522 * This code is still in a bit of flux and is implemented and
1523 * enabled in steps to simplify more conservative backporting.
1524 */
1525 pThis->INetworkNATCfg.pfnNotifyDnsChanged = drvNATNotifyDnsChanged;
1526#else
1527 pThis->INetworkNATCfg.pfnNotifyDnsChanged = NULL;
1528#endif
1529
1530 /*
1531 * Validate the config.
1532 */
1533 if (!CFGMR3AreValuesValid(pCfg,
1534 "PassDomain\0TFTPPrefix\0BootFile\0Network"
1535 "\0NextServer\0DNSProxy\0BindIP\0UseHostResolver\0"
1536 "SlirpMTU\0AliasMode\0"
1537 "SockRcv\0SockSnd\0TcpRcv\0TcpSnd\0"
1538 "ICMPCacheLimit\0"
1539 "SoMaxConnection\0"
1540#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1541 "HostResolverMappings\0"
1542#endif
1543 ))
1544 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1545 N_("Unknown NAT configuration option, only supports PassDomain,"
1546 " TFTPPrefix, BootFile and Network"));
1547
1548 /*
1549 * Get the configuration settings.
1550 */
1551 int rc;
1552 bool fPassDomain = true;
1553 GET_BOOL(rc, pThis, pCfg, "PassDomain", fPassDomain);
1554
1555 GET_STRING_ALLOC(rc, pThis, pCfg, "TFTPPrefix", pThis->pszTFTPPrefix);
1556 GET_STRING_ALLOC(rc, pThis, pCfg, "BootFile", pThis->pszBootFile);
1557 GET_STRING_ALLOC(rc, pThis, pCfg, "NextServer", pThis->pszNextServer);
1558
1559 int fDNSProxy = 0;
1560 GET_S32(rc, pThis, pCfg, "DNSProxy", fDNSProxy);
1561 int fUseHostResolver = 0;
1562 GET_S32(rc, pThis, pCfg, "UseHostResolver", fUseHostResolver);
1563 int MTU = 1500;
1564 GET_S32(rc, pThis, pCfg, "SlirpMTU", MTU);
1565 int i32AliasMode = 0;
1566 int i32MainAliasMode = 0;
1567 GET_S32(rc, pThis, pCfg, "AliasMode", i32MainAliasMode);
1568 int iIcmpCacheLimit = 100;
1569 GET_S32(rc, pThis, pCfg, "ICMPCacheLimit", iIcmpCacheLimit);
1570
1571 i32AliasMode |= (i32MainAliasMode & 0x1 ? 0x1 : 0);
1572 i32AliasMode |= (i32MainAliasMode & 0x2 ? 0x40 : 0);
1573 i32AliasMode |= (i32MainAliasMode & 0x4 ? 0x4 : 0);
1574 int i32SoMaxConn = 10;
1575 GET_S32(rc, pThis, pCfg, "SoMaxConnection", i32SoMaxConn);
1576 /*
1577 * Query the network port interface.
1578 */
1579 pThis->pIAboveNet = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKDOWN);
1580 if (!pThis->pIAboveNet)
1581 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1582 N_("Configuration error: the above device/driver didn't "
1583 "export the network port interface"));
1584 pThis->pIAboveConfig = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKCONFIG);
1585 if (!pThis->pIAboveConfig)
1586 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1587 N_("Configuration error: the above device/driver didn't "
1588 "export the network config interface"));
1589
1590 /* Generate a network address for this network card. */
1591 char szNetwork[32]; /* xxx.xxx.xxx.xxx/yy */
1592 GET_STRING(rc, pThis, pCfg, "Network", szNetwork[0], sizeof(szNetwork));
1593 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1594 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT%d: Configuration error: missing network"),
1595 pDrvIns->iInstance);
1596
1597 RTNETADDRIPV4 Network, Netmask;
1598
1599 rc = RTCidrStrToIPv4(szNetwork, &Network, &Netmask);
1600 if (RT_FAILURE(rc))
1601 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1602 N_("NAT#%d: Configuration error: network '%s' describes not a valid IPv4 network"),
1603 pDrvIns->iInstance, szNetwork);
1604
1605 /*
1606 * Initialize slirp.
1607 */
1608 rc = slirp_init(&pThis->pNATState, RT_H2N_U32(Network.u), Netmask.u,
1609 fPassDomain, !!fUseHostResolver, i32AliasMode,
1610 iIcmpCacheLimit, pThis);
1611 if (RT_SUCCESS(rc))
1612 {
1613 slirp_set_dhcp_TFTP_prefix(pThis->pNATState, pThis->pszTFTPPrefix);
1614 slirp_set_dhcp_TFTP_bootfile(pThis->pNATState, pThis->pszBootFile);
1615 slirp_set_dhcp_next_server(pThis->pNATState, pThis->pszNextServer);
1616 slirp_set_dhcp_dns_proxy(pThis->pNATState, !!fDNSProxy);
1617 slirp_set_mtu(pThis->pNATState, MTU);
1618 slirp_set_somaxconn(pThis->pNATState, i32SoMaxConn);
1619 char *pszBindIP = NULL;
1620 GET_STRING_ALLOC(rc, pThis, pCfg, "BindIP", pszBindIP);
1621 rc = slirp_set_binding_address(pThis->pNATState, pszBindIP);
1622 if (rc != 0 && pszBindIP && *pszBindIP)
1623 LogRel(("NAT: Value of BindIP has been ignored\n"));
1624
1625 if(pszBindIP != NULL)
1626 MMR3HeapFree(pszBindIP);
1627#define SLIRP_SET_TUNING_VALUE(name, setter) \
1628 do \
1629 { \
1630 int len = 0; \
1631 rc = CFGMR3QueryS32(pCfg, name, &len); \
1632 if (RT_SUCCESS(rc)) \
1633 setter(pThis->pNATState, len); \
1634 } while(0)
1635
1636 SLIRP_SET_TUNING_VALUE("SockRcv", slirp_set_rcvbuf);
1637 SLIRP_SET_TUNING_VALUE("SockSnd", slirp_set_sndbuf);
1638 SLIRP_SET_TUNING_VALUE("TcpRcv", slirp_set_tcp_rcvspace);
1639 SLIRP_SET_TUNING_VALUE("TcpSnd", slirp_set_tcp_sndspace);
1640
1641 slirp_register_statistics(pThis->pNATState, pDrvIns);
1642#ifdef VBOX_WITH_STATISTICS
1643# define DRV_PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
1644# define DRV_COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
1645# include "counters.h"
1646#endif
1647
1648#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1649 PCFGMNODE pMappingsCfg = CFGMR3GetChild(pCfg, "HostResolverMappings");
1650
1651 if (pMappingsCfg)
1652 {
1653 rc = drvNATConstructDNSMappings(pDrvIns->iInstance, pThis, pMappingsCfg);
1654 AssertRC(rc);
1655 }
1656#endif
1657 rc = drvNATConstructRedir(pDrvIns->iInstance, pThis, pCfg, &Network);
1658 if (RT_SUCCESS(rc))
1659 {
1660 /*
1661 * Register a load done notification to get the MAC address into the slirp
1662 * engine after we loaded a guest state.
1663 */
1664 rc = PDMDrvHlpSSMRegisterLoadDone(pDrvIns, drvNATLoadDone);
1665 AssertLogRelRCReturn(rc, rc);
1666
1667 rc = RTReqQueueCreate(&pThis->hSlirpReqQueue);
1668 AssertLogRelRCReturn(rc, rc);
1669
1670 rc = RTReqQueueCreate(&pThis->hRecvReqQueue);
1671 AssertLogRelRCReturn(rc, rc);
1672
1673 rc = RTReqQueueCreate(&pThis->hUrgRecvReqQueue);
1674 AssertLogRelRCReturn(rc, rc);
1675
1676 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pRecvThread, pThis, drvNATRecv,
1677 drvNATRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATRX");
1678 AssertRCReturn(rc, rc);
1679
1680 rc = RTSemEventCreate(&pThis->EventRecv);
1681 AssertRCReturn(rc, rc);
1682
1683 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pUrgRecvThread, pThis, drvNATUrgRecv,
1684 drvNATUrgRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATURGRX");
1685 AssertRCReturn(rc, rc);
1686
1687 rc = RTSemEventCreate(&pThis->EventRecv);
1688 AssertRCReturn(rc, rc);
1689
1690 rc = RTSemEventCreate(&pThis->EventUrgRecv);
1691 AssertRCReturn(rc, rc);
1692
1693 rc = RTReqQueueCreate(&pThis->hHostResQueue);
1694 AssertRCReturn(rc, rc);
1695
1696 rc = PDMDrvHlpThreadCreate(pThis->pDrvIns, &pThis->pHostResThread,
1697 pThis, drvNATHostResThread, drvNATHostResWakeup,
1698 64 * _1K, RTTHREADTYPE_IO, "HOSTRES");
1699 AssertRCReturn(rc, rc);
1700
1701 rc = RTCritSectInit(&pThis->DevAccessLock);
1702 AssertRCReturn(rc, rc);
1703
1704 rc = RTCritSectInit(&pThis->XmitLock);
1705 AssertRCReturn(rc, rc);
1706
1707 char szTmp[128];
1708 RTStrPrintf(szTmp, sizeof(szTmp), "nat%d", pDrvIns->iInstance);
1709 PDMDrvHlpDBGFInfoRegister(pDrvIns, szTmp, "NAT info.", drvNATInfo);
1710
1711#ifndef RT_OS_WINDOWS
1712 /*
1713 * Create the control pipe.
1714 */
1715 rc = RTPipeCreate(&pThis->hPipeRead, &pThis->hPipeWrite, 0 /*fFlags*/);
1716 AssertRCReturn(rc, rc);
1717#else
1718 pThis->hWakeupEvent = CreateEvent(NULL, FALSE, FALSE, NULL); /* auto-reset event */
1719 slirp_register_external_event(pThis->pNATState, pThis->hWakeupEvent,
1720 VBOX_WAKEUP_EVENT_INDEX);
1721#endif
1722
1723 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pSlirpThread, pThis, drvNATAsyncIoThread,
1724 drvNATAsyncIoWakeup, 128 * _1K, RTTHREADTYPE_IO, "NAT");
1725 AssertRCReturn(rc, rc);
1726
1727 pThis->enmLinkState = pThis->enmLinkStateWant = PDMNETWORKLINKSTATE_UP;
1728
1729#ifdef RT_OS_DARWIN
1730 /* Set up a watcher which notifies us everytime the DNS server changes. */
1731 int rc2 = VINF_SUCCESS;
1732 SCDynamicStoreContext SCDynStorCtx;
1733
1734 SCDynStorCtx.version = 0;
1735 SCDynStorCtx.info = pThis;
1736 SCDynStorCtx.retain = NULL;
1737 SCDynStorCtx.release = NULL;
1738 SCDynStorCtx.copyDescription = NULL;
1739
1740 SCDynamicStoreRef hDynStor = SCDynamicStoreCreate(NULL, CFSTR("org.virtualbox.drvnat"), drvNatDnsChanged, &SCDynStorCtx);
1741 if (hDynStor)
1742 {
1743 CFRunLoopSourceRef hRunLoopSrc = SCDynamicStoreCreateRunLoopSource(NULL, hDynStor, 0);
1744 if (hRunLoopSrc)
1745 {
1746 CFStringRef aWatchKeys[] =
1747 {
1748 CFSTR("State:/Network/Global/DNS")
1749 };
1750 CFArrayRef hArray = CFArrayCreate(NULL, (const void **)aWatchKeys, 1, &kCFTypeArrayCallBacks);
1751
1752 if (hArray)
1753 {
1754 if (SCDynamicStoreSetNotificationKeys(hDynStor, hArray, NULL))
1755 {
1756 CFRunLoopRef hRunLoopMain = CFRunLoopGetMain();
1757 CFRetain(hRunLoopMain);
1758 CFRunLoopAddSource(hRunLoopMain, hRunLoopSrc, kCFRunLoopCommonModes);
1759 CFRelease(hRunLoopMain);
1760 pThis->hRunLoopSrcDnsWatcher = hRunLoopSrc;
1761 }
1762 else
1763 rc2 = VERR_NO_MEMORY;
1764
1765 CFRelease(hArray);
1766 }
1767 else
1768 rc2 = VERR_NO_MEMORY;
1769
1770 if (RT_FAILURE(rc2)) /* Keep the runloop source referenced for destruction. */
1771 CFRelease(hRunLoopSrc);
1772 }
1773 CFRelease(hDynStor);
1774 }
1775 else
1776 rc2 = VERR_NO_MEMORY;
1777
1778 if (RT_FAILURE(rc2))
1779 LogRel(("NAT#%d: Failed to install DNS change notifier. The guest might loose DNS access when switching networks on the host\n",
1780 pDrvIns->iInstance));
1781#endif
1782
1783 /* might return VINF_NAT_DNS */
1784 return rc;
1785 }
1786
1787 /* failure path */
1788 slirp_term(pThis->pNATState);
1789 pThis->pNATState = NULL;
1790 }
1791 else
1792 {
1793 PDMDRV_SET_ERROR(pDrvIns, rc, N_("Unknown error during NAT networking setup: "));
1794 AssertMsgFailed(("Add error message for rc=%d (%Rrc)\n", rc, rc));
1795 }
1796
1797 return rc;
1798}
1799
1800
1801/**
1802 * NAT network transport driver registration record.
1803 */
1804const PDMDRVREG g_DrvNAT =
1805{
1806 /* u32Version */
1807 PDM_DRVREG_VERSION,
1808 /* szName */
1809 "NAT",
1810 /* szRCMod */
1811 "",
1812 /* szR0Mod */
1813 "",
1814 /* pszDescription */
1815 "NAT Network Transport Driver",
1816 /* fFlags */
1817 PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1818 /* fClass. */
1819 PDM_DRVREG_CLASS_NETWORK,
1820 /* cMaxInstances */
1821 ~0U,
1822 /* cbInstance */
1823 sizeof(DRVNAT),
1824 /* pfnConstruct */
1825 drvNATConstruct,
1826 /* pfnDestruct */
1827 drvNATDestruct,
1828 /* pfnRelocate */
1829 NULL,
1830 /* pfnIOCtl */
1831 NULL,
1832 /* pfnPowerOn */
1833 drvNATPowerOn,
1834 /* pfnReset */
1835 NULL,
1836 /* pfnSuspend */
1837 NULL,
1838 /* pfnResume */
1839 drvNATResume,
1840 /* pfnAttach */
1841 NULL,
1842 /* pfnDetach */
1843 NULL,
1844 /* pfnPowerOff */
1845 NULL,
1846 /* pfnSoftReset */
1847 NULL,
1848 /* u32EndVersion */
1849 PDM_DRVREG_VERSION
1850};
1851
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