VirtualBox

source: vbox/trunk/src/VBox/Devices/Network/DrvNAT.cpp@ 39775

Last change on this file since 39775 was 39766, checked in by vboxsync, 13 years ago

NAT: host resolver can use user-defined mapping instead of host provided mappings.
o need to test alias resolving.
o code is disabled (VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER) need more testing.
o CFGM configuration:

# VBoxManage setextradata deb6-i386 "VBoxInternal/Devices/e1000/0/LUN#0/AttachedDriver/Config/HostResolverMappings/1/HostIP" 127.0.0.1
# VBoxManage setextradata deb6-i386 "VBoxInternal/Devices/e1000/0/LUN#0/AttachedDriver/Config/HostResolverMappings/1/HostName" update.microsoft.com

Host resolver should be on

# VBoxManage modifyvm deb6-i386 --natdnshostresolver1 on
  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 51.3 KB
Line 
1/* $Id: DrvNAT.cpp 39766 2012-01-13 19:28:55Z vboxsync $ */
2/** @file
3 * DrvNAT - NAT network transport driver.
4 */
5
6/*
7 * Copyright (C) 2006-2011 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 */
17
18
19/*******************************************************************************
20* Header Files *
21*******************************************************************************/
22#define LOG_GROUP LOG_GROUP_DRV_NAT
23#define __STDC_LIMIT_MACROS
24#define __STDC_CONSTANT_MACROS
25#include "slirp/libslirp.h"
26#include "slirp/ctl.h"
27#include <VBox/vmm/pdmdrv.h>
28#include <VBox/vmm/pdmnetifs.h>
29#include <VBox/vmm/pdmnetinline.h>
30
31#include <iprt/assert.h>
32#include <iprt/critsect.h>
33#include <iprt/cidr.h>
34#include <iprt/file.h>
35#include <iprt/mem.h>
36#include <iprt/pipe.h>
37#include <iprt/string.h>
38#include <iprt/stream.h>
39#include <iprt/uuid.h>
40
41#include "VBoxDD.h"
42
43#ifndef RT_OS_WINDOWS
44# include <unistd.h>
45# include <fcntl.h>
46# include <poll.h>
47# include <errno.h>
48#endif
49#ifdef RT_OS_FREEBSD
50# include <netinet/in.h>
51#endif
52#include <iprt/semaphore.h>
53#include <iprt/req.h>
54
55#define COUNTERS_INIT
56#include "counters.h"
57
58
59/*******************************************************************************
60* Defined Constants And Macros *
61*******************************************************************************/
62
63/**
64 * @todo: This is a bad hack to prevent freezing the guest during high network
65 * activity. Windows host only. This needs to be fixed properly.
66 */
67#define VBOX_NAT_DELAY_HACK
68
69#define GET_EXTRADATA(pthis, node, name, rc, type, type_name, var) \
70do { \
71 (rc) = CFGMR3Query ## type((node), name, &(var)); \
72 if (RT_FAILURE((rc)) && (rc) != VERR_CFGM_VALUE_NOT_FOUND) \
73 return PDMDrvHlpVMSetError((pthis)->pDrvIns, (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \""name"\" " #type_name " failed"), \
74 (pthis)->pDrvIns->iInstance); \
75} while (0)
76
77#define GET_ED_STRICT(pthis, node, name, rc, type, type_name, var) \
78do { \
79 (rc) = CFGMR3Query ## type((node), name, &(var)); \
80 if (RT_FAILURE((rc))) \
81 return PDMDrvHlpVMSetError((pthis)->pDrvIns, (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \""name"\" " #type_name " failed"), \
82 (pthis)->pDrvIns->iInstance); \
83} while (0)
84
85#define GET_EXTRADATA_N(pthis, node, name, rc, type, type_name, var, var_size) \
86do { \
87 (rc) = CFGMR3Query ## type((node), name, &(var), var_size); \
88 if (RT_FAILURE((rc)) && (rc) != VERR_CFGM_VALUE_NOT_FOUND) \
89 return PDMDrvHlpVMSetError((pthis)->pDrvIns, (rc), RT_SRC_POS, N_("NAT#%d: configuration query for \""name"\" " #type_name " failed"), \
90 (pthis)->pDrvIns->iInstance); \
91} while (0)
92
93#define GET_BOOL(rc, pthis, node, name, var) \
94 GET_EXTRADATA(pthis, node, name, (rc), Bool, bolean, (var))
95#define GET_STRING(rc, pthis, node, name, var, var_size) \
96 GET_EXTRADATA_N(pthis, node, name, (rc), String, string, (var), (var_size))
97#define GET_STRING_ALLOC(rc, pthis, node, name, var) \
98 GET_EXTRADATA(pthis, node, name, (rc), StringAlloc, string, (var))
99#define GET_S32(rc, pthis, node, name, var) \
100 GET_EXTRADATA(pthis, node, name, (rc), S32, int, (var))
101#define GET_S32_STRICT(rc, pthis, node, name, var) \
102 GET_ED_STRICT(pthis, node, name, (rc), S32, int, (var))
103
104
105
106#define DO_GET_IP(rc, node, instance, status, x) \
107do { \
108 char sz##x[32]; \
109 GET_STRING((rc), (node), (instance), #x, sz ## x[0], sizeof(sz ## x)); \
110 if (rc != VERR_CFGM_VALUE_NOT_FOUND) \
111 (status) = inet_aton(sz ## x, &x); \
112} while (0)
113
114#define GETIP_DEF(rc, node, instance, x, def) \
115do \
116{ \
117 int status = 0; \
118 DO_GET_IP((rc), (node), (instance), status, x); \
119 if (status == 0 || rc == VERR_CFGM_VALUE_NOT_FOUND) \
120 x.s_addr = def; \
121} while (0)
122
123/*******************************************************************************
124* Structures and Typedefs *
125*******************************************************************************/
126/**
127 * NAT network transport driver instance data.
128 *
129 * @implements PDMINETWORKUP
130 */
131typedef struct DRVNAT
132{
133 /** The network interface. */
134 PDMINETWORKUP INetworkUp;
135 /** The network NAT Engine configureation. */
136 PDMINETWORKNATCONFIG INetworkNATCfg;
137 /** The port we're attached to. */
138 PPDMINETWORKDOWN pIAboveNet;
139 /** The network config of the port we're attached to. */
140 PPDMINETWORKCONFIG pIAboveConfig;
141 /** Pointer to the driver instance. */
142 PPDMDRVINS pDrvIns;
143 /** Link state */
144 PDMNETWORKLINKSTATE enmLinkState;
145 /** NAT state for this instance. */
146 PNATState pNATState;
147 /** TFTP directory prefix. */
148 char *pszTFTPPrefix;
149 /** Boot file name to provide in the DHCP server response. */
150 char *pszBootFile;
151 /** tftp server name to provide in the DHCP server response. */
152 char *pszNextServer;
153 /** Polling thread. */
154 PPDMTHREAD pSlirpThread;
155 /** Queue for NAT-thread-external events. */
156 RTREQQUEUE hSlirpReqQueue;
157 /** The guest IP for port-forwarding. */
158 uint32_t GuestIP;
159 /** Link state set when the VM is suspended. */
160 PDMNETWORKLINKSTATE enmLinkStateWant;
161
162#ifdef VBOX_WITH_SLIRP_MT
163 PPDMTHREAD pGuestThread;
164#endif
165#ifndef RT_OS_WINDOWS
166 /** The write end of the control pipe. */
167 RTPIPE hPipeWrite;
168 /** The read end of the control pipe. */
169 RTPIPE hPipeRead;
170#else
171 /** for external notification */
172 HANDLE hWakeupEvent;
173#endif
174
175#define DRV_PROFILE_COUNTER(name, dsc) STAMPROFILE Stat ## name
176#define DRV_COUNTING_COUNTER(name, dsc) STAMCOUNTER Stat ## name
177#include "counters.h"
178 /** thread delivering packets for receiving by the guest */
179 PPDMTHREAD pRecvThread;
180 /** thread delivering urg packets for receiving by the guest */
181 PPDMTHREAD pUrgRecvThread;
182 /** event to wakeup the guest receive thread */
183 RTSEMEVENT EventRecv;
184 /** event to wakeup the guest urgent receive thread */
185 RTSEMEVENT EventUrgRecv;
186 /** Receive Req queue (deliver packets to the guest) */
187 RTREQQUEUE hRecvReqQueue;
188 /** Receive Urgent Req queue (deliver packets to the guest). */
189 RTREQQUEUE hUrgRecvReqQueue;
190
191 /** makes access to device func RecvAvail and Recv atomical. */
192 RTCRITSECT DevAccessLock;
193 /** Number of in-flight urgent packets. */
194 volatile uint32_t cUrgPkts;
195 /** Number of in-flight regular packets. */
196 volatile uint32_t cPkts;
197
198 /** Transmit lock taken by BeginXmit and released by EndXmit. */
199 RTCRITSECT XmitLock;
200} DRVNAT;
201AssertCompileMemberAlignment(DRVNAT, StatNATRecvWakeups, 8);
202/** Pointer the NAT driver instance data. */
203typedef DRVNAT *PDRVNAT;
204
205
206/*******************************************************************************
207* Internal Functions *
208*******************************************************************************/
209static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho);
210
211
212static DECLCALLBACK(int) drvNATRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
213{
214 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
215
216 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
217 return VINF_SUCCESS;
218
219 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
220 {
221 RTReqQueueProcess(pThis->hRecvReqQueue, 0);
222 if (ASMAtomicReadU32(&pThis->cPkts) == 0)
223 RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
224 }
225 return VINF_SUCCESS;
226}
227
228
229static DECLCALLBACK(int) drvNATRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
230{
231 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
232 int rc;
233 rc = RTSemEventSignal(pThis->EventRecv);
234
235 STAM_COUNTER_INC(&pThis->StatNATRecvWakeups);
236 return VINF_SUCCESS;
237}
238
239static DECLCALLBACK(int) drvNATUrgRecv(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
240{
241 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
242
243 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
244 return VINF_SUCCESS;
245
246 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
247 {
248 RTReqQueueProcess(pThis->hUrgRecvReqQueue, 0);
249 if (ASMAtomicReadU32(&pThis->cUrgPkts) == 0)
250 {
251 int rc = RTSemEventWait(pThis->EventUrgRecv, RT_INDEFINITE_WAIT);
252 AssertRC(rc);
253 }
254 }
255 return VINF_SUCCESS;
256}
257
258static DECLCALLBACK(int) drvNATUrgRecvWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
259{
260 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
261 int rc = RTSemEventSignal(pThis->EventUrgRecv);
262 AssertRC(rc);
263
264 return VINF_SUCCESS;
265}
266
267static DECLCALLBACK(void) drvNATUrgRecvWorker(PDRVNAT pThis, uint8_t *pu8Buf, int cb, struct mbuf *m)
268{
269 int rc = RTCritSectEnter(&pThis->DevAccessLock);
270 AssertRC(rc);
271 rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
272 if (RT_SUCCESS(rc))
273 {
274 rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
275 AssertRC(rc);
276 }
277 else if ( rc != VERR_TIMEOUT
278 && rc != VERR_INTERRUPTED)
279 {
280 AssertRC(rc);
281 }
282
283 rc = RTCritSectLeave(&pThis->DevAccessLock);
284 AssertRC(rc);
285
286 slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
287 if (ASMAtomicDecU32(&pThis->cUrgPkts) == 0)
288 {
289 drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
290 drvNATNotifyNATThread(pThis, "drvNATUrgRecvWorker");
291 }
292}
293
294
295static DECLCALLBACK(void) drvNATRecvWorker(PDRVNAT pThis, uint8_t *pu8Buf, int cb, struct mbuf *m)
296{
297 int rc;
298 STAM_PROFILE_START(&pThis->StatNATRecv, a);
299
300
301 while (ASMAtomicReadU32(&pThis->cUrgPkts) != 0)
302 {
303 rc = RTSemEventWait(pThis->EventRecv, RT_INDEFINITE_WAIT);
304 if ( RT_FAILURE(rc)
305 && ( rc == VERR_TIMEOUT
306 || rc == VERR_INTERRUPTED))
307 goto done_unlocked;
308 }
309
310 rc = RTCritSectEnter(&pThis->DevAccessLock);
311 AssertRC(rc);
312
313 STAM_PROFILE_START(&pThis->StatNATRecvWait, b);
314 rc = pThis->pIAboveNet->pfnWaitReceiveAvail(pThis->pIAboveNet, RT_INDEFINITE_WAIT);
315 STAM_PROFILE_STOP(&pThis->StatNATRecvWait, b);
316
317 if (RT_SUCCESS(rc))
318 {
319 rc = pThis->pIAboveNet->pfnReceive(pThis->pIAboveNet, pu8Buf, cb);
320 AssertRC(rc);
321 }
322 else if ( rc != VERR_TIMEOUT
323 && rc != VERR_INTERRUPTED)
324 {
325 AssertRC(rc);
326 }
327
328 rc = RTCritSectLeave(&pThis->DevAccessLock);
329 AssertRC(rc);
330
331done_unlocked:
332 slirp_ext_m_free(pThis->pNATState, m, pu8Buf);
333 ASMAtomicDecU32(&pThis->cPkts);
334
335 drvNATNotifyNATThread(pThis, "drvNATRecvWorker");
336
337 STAM_PROFILE_STOP(&pThis->StatNATRecv, a);
338}
339
340/**
341 * Frees a S/G buffer allocated by drvNATNetworkUp_AllocBuf.
342 *
343 * @param pThis Pointer to the NAT instance.
344 * @param pSgBuf The S/G buffer to free.
345 */
346static void drvNATFreeSgBuf(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
347{
348 Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_MAGIC_MASK) == PDMSCATTERGATHER_FLAGS_MAGIC);
349 pSgBuf->fFlags = 0;
350 if (pSgBuf->pvAllocator)
351 {
352 Assert(!pSgBuf->pvUser);
353 slirp_ext_m_free(pThis->pNATState, (struct mbuf *)pSgBuf->pvAllocator, NULL);
354 pSgBuf->pvAllocator = NULL;
355 }
356 else if (pSgBuf->pvUser)
357 {
358 RTMemFree(pSgBuf->aSegs[0].pvSeg);
359 pSgBuf->aSegs[0].pvSeg = NULL;
360 RTMemFree(pSgBuf->pvUser);
361 pSgBuf->pvUser = NULL;
362 }
363 RTMemFree(pSgBuf);
364}
365
366/**
367 * Worker function for drvNATSend().
368 *
369 * @param pThis Pointer to the NAT instance.
370 * @param pSgBuf The scatter/gather buffer.
371 * @thread NAT
372 */
373static void drvNATSendWorker(PDRVNAT pThis, PPDMSCATTERGATHER pSgBuf)
374{
375 Assert(pThis->enmLinkState == PDMNETWORKLINKSTATE_UP);
376 if (pThis->enmLinkState == PDMNETWORKLINKSTATE_UP)
377 {
378 struct mbuf *m = (struct mbuf *)pSgBuf->pvAllocator;
379 if (m)
380 {
381 /*
382 * A normal frame.
383 */
384 pSgBuf->pvAllocator = NULL;
385 slirp_input(pThis->pNATState, m, pSgBuf->cbUsed);
386 }
387 else
388 {
389 /*
390 * GSO frame, need to segment it.
391 */
392 /** @todo Make the NAT engine grok large frames? Could be more efficient... */
393#if 0 /* this is for testing PDMNetGsoCarveSegmentQD. */
394 uint8_t abHdrScratch[256];
395#endif
396 uint8_t const *pbFrame = (uint8_t const *)pSgBuf->aSegs[0].pvSeg;
397 PCPDMNETWORKGSO pGso = (PCPDMNETWORKGSO)pSgBuf->pvUser;
398 uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, pSgBuf->cbUsed); Assert(cSegs > 1);
399 for (size_t iSeg = 0; iSeg < cSegs; iSeg++)
400 {
401 size_t cbSeg;
402 void *pvSeg;
403 m = slirp_ext_m_get(pThis->pNATState, pGso->cbHdrsTotal + pGso->cbMaxSeg, &pvSeg, &cbSeg);
404 if (!m)
405 break;
406
407#if 1
408 uint32_t cbPayload, cbHdrs;
409 uint32_t offPayload = PDMNetGsoCarveSegment(pGso, pbFrame, pSgBuf->cbUsed,
410 iSeg, cSegs, (uint8_t *)pvSeg, &cbHdrs, &cbPayload);
411 memcpy((uint8_t *)pvSeg + cbHdrs, pbFrame + offPayload, cbPayload);
412
413 slirp_input(pThis->pNATState, m, cbPayload + cbHdrs);
414#else
415 uint32_t cbSegFrame;
416 void *pvSegFrame = PDMNetGsoCarveSegmentQD(pGso, (uint8_t *)pbFrame, pSgBuf->cbUsed, abHdrScratch,
417 iSeg, cSegs, &cbSegFrame);
418 memcpy((uint8_t *)pvSeg, pvSegFrame, cbSegFrame);
419
420 slirp_input(pThis->pNATState, m, cbSegFrame);
421#endif
422 }
423 }
424 }
425 drvNATFreeSgBuf(pThis, pSgBuf);
426
427 /** @todo Implement the VERR_TRY_AGAIN drvNATNetworkUp_AllocBuf semantics. */
428}
429
430/**
431 * @interface_method_impl{PDMINETWORKUP,pfnBeginXmit}
432 */
433static DECLCALLBACK(int) drvNATNetworkUp_BeginXmit(PPDMINETWORKUP pInterface, bool fOnWorkerThread)
434{
435 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
436 int rc = RTCritSectTryEnter(&pThis->XmitLock);
437 if (RT_FAILURE(rc))
438 {
439 /** @todo Kick the worker thread when we have one... */
440 rc = VERR_TRY_AGAIN;
441 }
442 return rc;
443}
444
445/**
446 * @interface_method_impl{PDMINETWORKUP,pfnAllocBuf}
447 */
448static DECLCALLBACK(int) drvNATNetworkUp_AllocBuf(PPDMINETWORKUP pInterface, size_t cbMin,
449 PCPDMNETWORKGSO pGso, PPPDMSCATTERGATHER ppSgBuf)
450{
451 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
452 Assert(RTCritSectIsOwner(&pThis->XmitLock));
453
454 /*
455 * Drop the incoming frame if the NAT thread isn't running.
456 */
457 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
458 {
459 Log(("drvNATNetowrkUp_AllocBuf: returns VERR_NET_NO_NETWORK\n"));
460 return VERR_NET_NO_NETWORK;
461 }
462
463 /*
464 * Allocate a scatter/gather buffer and an mbuf.
465 */
466 PPDMSCATTERGATHER pSgBuf = (PPDMSCATTERGATHER)RTMemAlloc(sizeof(*pSgBuf));
467 if (!pSgBuf)
468 return VERR_NO_MEMORY;
469 if (!pGso)
470 {
471 pSgBuf->pvUser = NULL;
472 pSgBuf->pvAllocator = slirp_ext_m_get(pThis->pNATState, cbMin,
473 &pSgBuf->aSegs[0].pvSeg, &pSgBuf->aSegs[0].cbSeg);
474 if (!pSgBuf->pvAllocator)
475 {
476 RTMemFree(pSgBuf);
477 return VERR_TRY_AGAIN;
478 }
479 }
480 else
481 {
482 pSgBuf->pvUser = RTMemDup(pGso, sizeof(*pGso));
483 pSgBuf->pvAllocator = NULL;
484 pSgBuf->aSegs[0].cbSeg = RT_ALIGN_Z(cbMin, 16);
485 pSgBuf->aSegs[0].pvSeg = RTMemAlloc(pSgBuf->aSegs[0].cbSeg);
486 if (!pSgBuf->pvUser || !pSgBuf->aSegs[0].pvSeg)
487 {
488 RTMemFree(pSgBuf->aSegs[0].pvSeg);
489 RTMemFree(pSgBuf->pvUser);
490 RTMemFree(pSgBuf);
491 return VERR_TRY_AGAIN;
492 }
493 }
494
495 /*
496 * Initialize the S/G buffer and return.
497 */
498 pSgBuf->fFlags = PDMSCATTERGATHER_FLAGS_MAGIC | PDMSCATTERGATHER_FLAGS_OWNER_1;
499 pSgBuf->cbUsed = 0;
500 pSgBuf->cbAvailable = pSgBuf->aSegs[0].cbSeg;
501 pSgBuf->cSegs = 1;
502
503#if 0 /* poison */
504 memset(pSgBuf->aSegs[0].pvSeg, 'F', pSgBuf->aSegs[0].cbSeg);
505#endif
506 *ppSgBuf = pSgBuf;
507 return VINF_SUCCESS;
508}
509
510/**
511 * @interface_method_impl{PDMINETWORKUP,pfnFreeBuf}
512 */
513static DECLCALLBACK(int) drvNATNetworkUp_FreeBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf)
514{
515 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
516 Assert(RTCritSectIsOwner(&pThis->XmitLock));
517 drvNATFreeSgBuf(pThis, pSgBuf);
518 return VINF_SUCCESS;
519}
520
521/**
522 * @interface_method_impl{PDMINETWORKUP,pfnSendBuf}
523 */
524static DECLCALLBACK(int) drvNATNetworkUp_SendBuf(PPDMINETWORKUP pInterface, PPDMSCATTERGATHER pSgBuf, bool fOnWorkerThread)
525{
526 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
527 Assert((pSgBuf->fFlags & PDMSCATTERGATHER_FLAGS_OWNER_MASK) == PDMSCATTERGATHER_FLAGS_OWNER_1);
528 Assert(RTCritSectIsOwner(&pThis->XmitLock));
529
530 int rc;
531 if (pThis->pSlirpThread->enmState == PDMTHREADSTATE_RUNNING)
532 {
533 /* Set an FTM checkpoint as this operation changes the state permanently. */
534 PDMDrvHlpFTSetCheckpoint(pThis->pDrvIns, FTMCHECKPOINTTYPE_NETWORK);
535
536#ifdef VBOX_WITH_SLIRP_MT
537 RTREQQUEUE hQueue = (RTREQQUEUE)slirp_get_queue(pThis->pNATState);
538#else
539 RTREQQUEUE hQueue = pThis->hSlirpReqQueue;
540#endif
541 rc = RTReqQueueCallEx(hQueue, NULL /*ppReq*/, 0 /*cMillies*/, RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
542 (PFNRT)drvNATSendWorker, 2, pThis, pSgBuf);
543 if (RT_SUCCESS(rc))
544 {
545 drvNATNotifyNATThread(pThis, "drvNATNetworkUp_SendBuf");
546 return VINF_SUCCESS;
547 }
548
549 rc = VERR_NET_NO_BUFFER_SPACE;
550 }
551 else
552 rc = VERR_NET_DOWN;
553 drvNATFreeSgBuf(pThis, pSgBuf);
554 return rc;
555}
556
557/**
558 * @interface_method_impl{PDMINETWORKUP,pfnEndXmit}
559 */
560static DECLCALLBACK(void) drvNATNetworkUp_EndXmit(PPDMINETWORKUP pInterface)
561{
562 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
563 RTCritSectLeave(&pThis->XmitLock);
564}
565
566/**
567 * Get the NAT thread out of poll/WSAWaitForMultipleEvents
568 */
569static void drvNATNotifyNATThread(PDRVNAT pThis, const char *pszWho)
570{
571 int rc;
572#ifndef RT_OS_WINDOWS
573 /* kick poll() */
574 size_t cbIgnored;
575 rc = RTPipeWrite(pThis->hPipeWrite, "", 1, &cbIgnored);
576#else
577 /* kick WSAWaitForMultipleEvents */
578 rc = WSASetEvent(pThis->hWakeupEvent);
579#endif
580 AssertRC(rc);
581}
582
583/**
584 * @interface_method_impl{PDMINETWORKUP,pfnSetPromiscuousMode}
585 */
586static DECLCALLBACK(void) drvNATNetworkUp_SetPromiscuousMode(PPDMINETWORKUP pInterface, bool fPromiscuous)
587{
588 LogFlow(("drvNATNetworkUp_SetPromiscuousMode: fPromiscuous=%d\n", fPromiscuous));
589 /* nothing to do */
590}
591
592/**
593 * Worker function for drvNATNetworkUp_NotifyLinkChanged().
594 * @thread "NAT" thread.
595 */
596static void drvNATNotifyLinkChangedWorker(PDRVNAT pThis, PDMNETWORKLINKSTATE enmLinkState)
597{
598 pThis->enmLinkState = pThis->enmLinkStateWant = enmLinkState;
599 switch (enmLinkState)
600 {
601 case PDMNETWORKLINKSTATE_UP:
602 LogRel(("NAT: link up\n"));
603 slirp_link_up(pThis->pNATState);
604 break;
605
606 case PDMNETWORKLINKSTATE_DOWN:
607 case PDMNETWORKLINKSTATE_DOWN_RESUME:
608 LogRel(("NAT: link down\n"));
609 slirp_link_down(pThis->pNATState);
610 break;
611
612 default:
613 AssertMsgFailed(("drvNATNetworkUp_NotifyLinkChanged: unexpected link state %d\n", enmLinkState));
614 }
615}
616
617/**
618 * Notification on link status changes.
619 *
620 * @param pInterface Pointer to the interface structure containing the called function pointer.
621 * @param enmLinkState The new link state.
622 * @thread EMT
623 */
624static DECLCALLBACK(void) drvNATNetworkUp_NotifyLinkChanged(PPDMINETWORKUP pInterface, PDMNETWORKLINKSTATE enmLinkState)
625{
626 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkUp);
627
628 LogFlow(("drvNATNetworkUp_NotifyLinkChanged: enmLinkState=%d\n", enmLinkState));
629
630 /* Don't queue new requests when the NAT thread is about to stop.
631 * But the VM could also be paused. So memorize the desired state. */
632 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
633 {
634 pThis->enmLinkStateWant = enmLinkState;
635 return;
636 }
637
638 PRTREQ pReq;
639 int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /*cMillies*/, RTREQFLAGS_VOID,
640 (PFNRT)drvNATNotifyLinkChangedWorker, 2, pThis, enmLinkState);
641 if (RT_LIKELY(rc == VERR_TIMEOUT))
642 {
643 drvNATNotifyNATThread(pThis, "drvNATNetworkUp_NotifyLinkChanged");
644 rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
645 AssertRC(rc);
646 }
647 else
648 AssertRC(rc);
649 RTReqRelease(pReq);
650}
651
652static void drvNATNotifyApplyPortForwardCommand(PDRVNAT pThis, bool fRemove,
653 bool fUdp, const char *pHostIp,
654 uint16_t u16HostPort, const char *pGuestIp, uint16_t u16GuestPort)
655{
656 RTMAC Mac;
657 RT_ZERO(Mac); /* can't get MAC here */
658 if (pThis->pIAboveConfig)
659 pThis->pIAboveConfig->pfnGetMac(pThis->pIAboveConfig, &Mac);
660
661 struct in_addr guestIp, hostIp;
662
663 if ( pHostIp == NULL
664 || inet_aton(pHostIp, &hostIp) == 0)
665 hostIp.s_addr = INADDR_ANY;
666
667 if ( pGuestIp == NULL
668 || inet_aton(pGuestIp, &guestIp) == 0)
669 guestIp.s_addr = pThis->GuestIP;
670
671 if (fRemove)
672 slirp_remove_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort);
673 else
674 slirp_add_redirect(pThis->pNATState, fUdp, hostIp, u16HostPort, guestIp, u16GuestPort, Mac.au8);
675}
676
677DECLCALLBACK(int) drvNATNetworkNatConfig_RedirectRuleCommand(PPDMINETWORKNATCONFIG pInterface, bool fRemove,
678 bool fUdp, const char *pHostIp,
679 uint16_t u16HostPort, const char *pGuestIp, uint16_t u16GuestPort)
680{
681 LogFlowFunc(("fRemove=%d, fUdp=%d, pHostIp=%s, u16HostPort=%u, pGuestIp=%s, u16GuestPort=%u\n",
682 RT_BOOL(fRemove), RT_BOOL(fUdp), pHostIp, u16HostPort, pGuestIp,
683 u16GuestPort));
684 PDRVNAT pThis = RT_FROM_MEMBER(pInterface, DRVNAT, INetworkNATCfg);
685 PRTREQ pReq;
686 int rc = RTReqQueueCallEx(pThis->hSlirpReqQueue, &pReq, 0 /*cMillies*/, RTREQFLAGS_VOID,
687 (PFNRT)drvNATNotifyApplyPortForwardCommand, 7, pThis, fRemove,
688 fUdp, pHostIp, u16HostPort, pGuestIp, u16GuestPort);
689 if (RT_LIKELY(rc == VERR_TIMEOUT))
690 {
691 drvNATNotifyNATThread(pThis, "drvNATNetworkNatConfig_RedirectRuleCommand");
692 rc = RTReqWait(pReq, RT_INDEFINITE_WAIT);
693 AssertRC(rc);
694 }
695 else
696 AssertRC(rc);
697
698 RTReqRelease(pReq);
699 port_forwarding_done:
700 return rc;
701}
702
703/**
704 * NAT thread handling the slirp stuff.
705 *
706 * The slirp implementation is single-threaded so we execute this enginre in a
707 * dedicated thread. We take care that this thread does not become the
708 * bottleneck: If the guest wants to send, a request is enqueued into the
709 * hSlirpReqQueue and handled asynchronously by this thread. If this thread
710 * wants to deliver packets to the guest, it enqueues a request into
711 * hRecvReqQueue which is later handled by the Recv thread.
712 */
713static DECLCALLBACK(int) drvNATAsyncIoThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
714{
715 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
716 int nFDs = -1;
717#ifdef RT_OS_WINDOWS
718 HANDLE *phEvents = slirp_get_events(pThis->pNATState);
719 unsigned int cBreak = 0;
720#else /* RT_OS_WINDOWS */
721 unsigned int cPollNegRet = 0;
722#endif /* !RT_OS_WINDOWS */
723
724 LogFlow(("drvNATAsyncIoThread: pThis=%p\n", pThis));
725
726 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
727 return VINF_SUCCESS;
728
729 if (pThis->enmLinkStateWant != pThis->enmLinkState)
730 drvNATNotifyLinkChangedWorker(pThis, pThis->enmLinkStateWant);
731
732 /*
733 * Polling loop.
734 */
735 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
736 {
737 /*
738 * To prevent concurrent execution of sending/receiving threads
739 */
740#ifndef RT_OS_WINDOWS
741 nFDs = slirp_get_nsock(pThis->pNATState);
742 /* allocation for all sockets + Management pipe */
743 struct pollfd *polls = (struct pollfd *)RTMemAlloc((1 + nFDs) * sizeof(struct pollfd) + sizeof(uint32_t));
744 if (polls == NULL)
745 return VERR_NO_MEMORY;
746
747 /* don't pass the management pipe */
748 slirp_select_fill(pThis->pNATState, &nFDs, &polls[1]);
749
750 polls[0].fd = RTPipeToNative(pThis->hPipeRead);
751 /* POLLRDBAND usually doesn't used on Linux but seems used on Solaris */
752 polls[0].events = POLLRDNORM | POLLPRI | POLLRDBAND;
753 polls[0].revents = 0;
754
755 int cChangedFDs = poll(polls, nFDs + 1, slirp_get_timeout_ms(pThis->pNATState));
756 if (cChangedFDs < 0)
757 {
758 if (errno == EINTR)
759 {
760 Log2(("NAT: signal was caught while sleep on poll\n"));
761 /* No error, just process all outstanding requests but don't wait */
762 cChangedFDs = 0;
763 }
764 else if (cPollNegRet++ > 128)
765 {
766 LogRel(("NAT:Poll returns (%s) suppressed %d\n", strerror(errno), cPollNegRet));
767 cPollNegRet = 0;
768 }
769 }
770
771 if (cChangedFDs >= 0)
772 {
773 slirp_select_poll(pThis->pNATState, &polls[1], nFDs);
774 if (polls[0].revents & (POLLRDNORM|POLLPRI|POLLRDBAND))
775 {
776 /* drain the pipe
777 *
778 * Note! drvNATSend decoupled so we don't know how many times
779 * device's thread sends before we've entered multiplex,
780 * so to avoid false alarm drain pipe here to the very end
781 *
782 * @todo: Probably we should counter drvNATSend to count how
783 * deep pipe has been filed before drain.
784 *
785 */
786 /** @todo XXX: Make it reading exactly we need to drain the
787 * pipe.*/
788 char ch;
789 size_t cbRead;
790 RTPipeRead(pThis->hPipeRead, &ch, 1, &cbRead);
791 }
792 }
793 /* process _all_ outstanding requests but don't wait */
794 RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
795 RTMemFree(polls);
796
797#else /* RT_OS_WINDOWS */
798 nFDs = -1;
799 slirp_select_fill(pThis->pNATState, &nFDs);
800 DWORD dwEvent = WSAWaitForMultipleEvents(nFDs, phEvents, FALSE,
801 slirp_get_timeout_ms(pThis->pNATState),
802 FALSE);
803 if ( (dwEvent < WSA_WAIT_EVENT_0 || dwEvent > WSA_WAIT_EVENT_0 + nFDs - 1)
804 && dwEvent != WSA_WAIT_TIMEOUT)
805 {
806 int error = WSAGetLastError();
807 LogRel(("NAT: WSAWaitForMultipleEvents returned %d (error %d)\n", dwEvent, error));
808 RTAssertPanic();
809 }
810
811 if (dwEvent == WSA_WAIT_TIMEOUT)
812 {
813 /* only check for slow/fast timers */
814 slirp_select_poll(pThis->pNATState, /* fTimeout=*/true, /*fIcmp=*/false);
815 continue;
816 }
817 /* poll the sockets in any case */
818 Log2(("%s: poll\n", __FUNCTION__));
819 slirp_select_poll(pThis->pNATState, /* fTimeout=*/false, /* fIcmp=*/(dwEvent == WSA_WAIT_EVENT_0));
820 /* process _all_ outstanding requests but don't wait */
821 RTReqQueueProcess(pThis->hSlirpReqQueue, 0);
822# ifdef VBOX_NAT_DELAY_HACK
823 if (cBreak++ > 128)
824 {
825 cBreak = 0;
826 RTThreadSleep(2);
827 }
828# endif
829#endif /* RT_OS_WINDOWS */
830 }
831
832 return VINF_SUCCESS;
833}
834
835
836/**
837 * Unblock the send thread so it can respond to a state change.
838 *
839 * @returns VBox status code.
840 * @param pDevIns The pcnet device instance.
841 * @param pThread The send thread.
842 */
843static DECLCALLBACK(int) drvNATAsyncIoWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
844{
845 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
846
847 drvNATNotifyNATThread(pThis, "drvNATAsyncIoWakeup");
848 return VINF_SUCCESS;
849}
850
851#ifdef VBOX_WITH_SLIRP_MT
852
853static DECLCALLBACK(int) drvNATAsyncIoGuest(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
854{
855 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
856
857 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
858 return VINF_SUCCESS;
859
860 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
861 slirp_process_queue(pThis->pNATState);
862
863 return VINF_SUCCESS;
864}
865
866
867static DECLCALLBACK(int) drvNATAsyncIoGuestWakeup(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
868{
869 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
870
871 return VINF_SUCCESS;
872}
873
874#endif /* VBOX_WITH_SLIRP_MT */
875
876/**
877 * Function called by slirp to check if it's possible to feed incoming data to the network port.
878 * @returns 1 if possible.
879 * @returns 0 if not possible.
880 */
881int slirp_can_output(void *pvUser)
882{
883 return 1;
884}
885
886void slirp_push_recv_thread(void *pvUser)
887{
888 PDRVNAT pThis = (PDRVNAT)pvUser;
889 Assert(pThis);
890 drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
891}
892
893void slirp_urg_output(void *pvUser, struct mbuf *m, const uint8_t *pu8Buf, int cb)
894{
895 PDRVNAT pThis = (PDRVNAT)pvUser;
896 Assert(pThis);
897
898 PRTREQ pReq = NULL;
899
900 /* don't queue new requests when the NAT thread is about to stop */
901 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
902 return;
903
904 ASMAtomicIncU32(&pThis->cUrgPkts);
905 int rc = RTReqQueueCallEx(pThis->hUrgRecvReqQueue, NULL /*ppReq*/, 0 /*cMillies*/, RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
906 (PFNRT)drvNATUrgRecvWorker, 4, pThis, pu8Buf, cb, m);
907 AssertRC(rc);
908 drvNATUrgRecvWakeup(pThis->pDrvIns, pThis->pUrgRecvThread);
909}
910
911/**
912 * Function called by slirp to wake up device after VERR_TRY_AGAIN
913 */
914void slirp_output_pending(void *pvUser)
915{
916 PDRVNAT pThis = (PDRVNAT)pvUser;
917 Assert(pThis);
918 pThis->pIAboveNet->pfnXmitPending(pThis->pIAboveNet);
919}
920
921/**
922 * Function called by slirp to feed incoming data to the NIC.
923 */
924void slirp_output(void *pvUser, struct mbuf *m, const uint8_t *pu8Buf, int cb)
925{
926 PDRVNAT pThis = (PDRVNAT)pvUser;
927 Assert(pThis);
928
929 LogFlow(("slirp_output BEGIN %x %d\n", pu8Buf, cb));
930 Log2(("slirp_output: pu8Buf=%p cb=%#x (pThis=%p)\n%.*Rhxd\n", pu8Buf, cb, pThis, cb, pu8Buf));
931
932 PRTREQ pReq = NULL;
933
934 /* don't queue new requests when the NAT thread is about to stop */
935 if (pThis->pSlirpThread->enmState != PDMTHREADSTATE_RUNNING)
936 return;
937
938 ASMAtomicIncU32(&pThis->cPkts);
939 int rc = RTReqQueueCallEx(pThis->hRecvReqQueue, NULL /*ppReq*/, 0 /*cMillies*/, RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT,
940 (PFNRT)drvNATRecvWorker, 4, pThis, pu8Buf, cb, m);
941 AssertRC(rc);
942 drvNATRecvWakeup(pThis->pDrvIns, pThis->pRecvThread);
943 STAM_COUNTER_INC(&pThis->StatQueuePktSent);
944}
945
946
947/**
948 * @interface_method_impl{PDMIBASE,pfnQueryInterface}
949 */
950static DECLCALLBACK(void *) drvNATQueryInterface(PPDMIBASE pInterface, const char *pszIID)
951{
952 PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
953 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
954
955 PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
956 PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKUP, &pThis->INetworkUp);
957 PDMIBASE_RETURN_INTERFACE(pszIID, PDMINETWORKNATCONFIG, &pThis->INetworkNATCfg);
958 return NULL;
959}
960
961
962/**
963 * Get the MAC address into the slirp stack.
964 *
965 * Called by drvNATLoadDone and drvNATPowerOn.
966 */
967static void drvNATSetMac(PDRVNAT pThis)
968{
969 if (pThis->pIAboveConfig)
970 {
971 RTMAC Mac;
972 pThis->pIAboveConfig->pfnGetMac(pThis->pIAboveConfig, &Mac);
973 /* Re-activate the port forwarding. If */
974 slirp_set_ethaddr_and_activate_port_forwarding(pThis->pNATState, Mac.au8, pThis->GuestIP);
975 }
976}
977
978
979/**
980 * After loading we have to pass the MAC address of the ethernet device to the slirp stack.
981 * Otherwise the guest is not reachable until it performs a DHCP request or an ARP request
982 * (usually done during guest boot).
983 */
984static DECLCALLBACK(int) drvNATLoadDone(PPDMDRVINS pDrvIns, PSSMHANDLE pSSMHandle)
985{
986 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
987 drvNATSetMac(pThis);
988 return VINF_SUCCESS;
989}
990
991
992/**
993 * Some guests might not use DHCP to retrieve an IP but use a static IP.
994 */
995static DECLCALLBACK(void) drvNATPowerOn(PPDMDRVINS pDrvIns)
996{
997 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
998 drvNATSetMac(pThis);
999}
1000
1001
1002/**
1003 * Info handler.
1004 */
1005static DECLCALLBACK(void) drvNATInfo(PPDMDRVINS pDrvIns, PCDBGFINFOHLP pHlp, const char *pszArgs)
1006{
1007 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1008 slirp_info(pThis->pNATState, pHlp, pszArgs);
1009}
1010
1011#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1012static int drvNATConstructDNSMappings(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pMappingsCfg)
1013{
1014 int rc = VINF_SUCCESS;
1015 LogFlowFunc(("ENTER: iInstance:%d\n", iInstance));
1016 for (PCFGMNODE pNode = CFGMR3GetFirstChild(pMappingsCfg); pNode; pNode = CFGMR3GetNextChild(pNode))
1017 {
1018 if (!CFGMR3AreValuesValid(pNode, "HostName\0HostIP\0"))
1019 return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1020 N_("Unknown configuration in dns mapping"));
1021 char szHostName[255];
1022 RT_ZERO(szHostName);
1023 GET_STRING(rc, pThis, pNode, "HostName", szHostName[0], sizeof(szHostName));
1024 struct in_addr HostIP;
1025 GETIP_DEF(rc, pThis, pNode, HostIP, INADDR_ANY);
1026 slirp_add_host_resolver_mapping(pThis->pNATState, szHostName, HostIP.s_addr);
1027 }
1028 LogFlowFunc(("LEAVE: %Rrc\n", rc));
1029 return rc;
1030}
1031#endif /* !VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER */
1032
1033
1034/**
1035 * Sets up the redirectors.
1036 *
1037 * @returns VBox status code.
1038 * @param pCfg The configuration handle.
1039 */
1040static int drvNATConstructRedir(unsigned iInstance, PDRVNAT pThis, PCFGMNODE pCfg, RTIPV4ADDR Network)
1041{
1042 RTMAC Mac;
1043 RT_ZERO(Mac); /* can't get MAC here */
1044
1045 /*
1046 * Enumerate redirections.
1047 */
1048 for (PCFGMNODE pNode = CFGMR3GetFirstChild(pCfg); pNode; pNode = CFGMR3GetNextChild(pNode))
1049 {
1050#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1051 char szNodeName[32];
1052 CFGMR3GetName(pNode, szNodeName, 32);
1053 if ( !RTStrICmp(szNodeName, "HostResolverMappings")
1054 || !RTStrICmp(szNodeName, "AttachedDriver"))
1055 continue;
1056#endif
1057 /*
1058 * Validate the port forwarding config.
1059 */
1060 if (!CFGMR3AreValuesValid(pNode, "Protocol\0UDP\0HostPort\0GuestPort\0GuestIP\0BindIP\0"))
1061 return PDMDRV_SET_ERROR(pThis->pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1062 N_("Unknown configuration in port forwarding"));
1063
1064 /* protocol type */
1065 bool fUDP;
1066 char szProtocol[32];
1067 int rc;
1068 GET_STRING(rc, pThis, pNode, "Protocol", szProtocol[0], sizeof(szProtocol));
1069 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1070 {
1071 fUDP = false;
1072 GET_BOOL(rc, pThis, pNode, "UDP", fUDP);
1073 }
1074 else if (RT_SUCCESS(rc))
1075 {
1076 if (!RTStrICmp(szProtocol, "TCP"))
1077 fUDP = false;
1078 else if (!RTStrICmp(szProtocol, "UDP"))
1079 fUDP = true;
1080 else
1081 return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
1082 N_("NAT#%d: Invalid configuration value for \"Protocol\": \"%s\""),
1083 iInstance, szProtocol);
1084 }
1085 else
1086 return PDMDrvHlpVMSetError(pThis->pDrvIns, rc, RT_SRC_POS,
1087 N_("NAT#%d: configuration query for \"Protocol\" failed"),
1088 iInstance);
1089 /* host port */
1090 int32_t iHostPort;
1091 GET_S32_STRICT(rc, pThis, pNode, "HostPort", iHostPort);
1092
1093 /* guest port */
1094 int32_t iGuestPort;
1095 GET_S32_STRICT(rc, pThis, pNode, "GuestPort", iGuestPort);
1096
1097 /* guest address */
1098 struct in_addr GuestIP;
1099 /* @todo (vvl) use CTL_* */
1100 GETIP_DEF(rc, pThis, pNode, GuestIP, htonl(Network | CTL_GUEST));
1101
1102 /* Store the guest IP for re-establishing the port-forwarding rules. Note that GuestIP
1103 * is not documented. Without */
1104 if (pThis->GuestIP == INADDR_ANY)
1105 pThis->GuestIP = GuestIP.s_addr;
1106
1107 /*
1108 * Call slirp about it.
1109 */
1110 struct in_addr BindIP;
1111 GETIP_DEF(rc, pThis, pNode, BindIP, INADDR_ANY);
1112 if (slirp_add_redirect(pThis->pNATState, fUDP, BindIP, iHostPort, GuestIP, iGuestPort, Mac.au8) < 0)
1113 return PDMDrvHlpVMSetError(pThis->pDrvIns, VERR_NAT_REDIR_SETUP, RT_SRC_POS,
1114 N_("NAT#%d: configuration error: failed to set up "
1115 "redirection of %d to %d. Probably a conflict with "
1116 "existing services or other rules"), iInstance, iHostPort,
1117 iGuestPort);
1118 } /* for each redir rule */
1119
1120 return VINF_SUCCESS;
1121}
1122
1123
1124/**
1125 * Destruct a driver instance.
1126 *
1127 * Most VM resources are freed by the VM. This callback is provided so that any non-VM
1128 * resources can be freed correctly.
1129 *
1130 * @param pDrvIns The driver instance data.
1131 */
1132static DECLCALLBACK(void) drvNATDestruct(PPDMDRVINS pDrvIns)
1133{
1134 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1135 LogFlow(("drvNATDestruct:\n"));
1136 PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
1137
1138 if (pThis->pNATState)
1139 {
1140 slirp_term(pThis->pNATState);
1141 slirp_deregister_statistics(pThis->pNATState, pDrvIns);
1142#ifdef VBOX_WITH_STATISTICS
1143# define DRV_PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1144# define DRV_COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pThis)
1145# include "counters.h"
1146#endif
1147 pThis->pNATState = NULL;
1148 }
1149
1150 RTReqQueueDestroy(pThis->hSlirpReqQueue);
1151 pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1152
1153 RTReqQueueDestroy(pThis->hUrgRecvReqQueue);
1154 pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1155
1156 RTSemEventDestroy(pThis->EventRecv);
1157 pThis->EventRecv = NIL_RTSEMEVENT;
1158
1159 RTSemEventDestroy(pThis->EventUrgRecv);
1160 pThis->EventUrgRecv = NIL_RTSEMEVENT;
1161
1162 if (RTCritSectIsInitialized(&pThis->DevAccessLock))
1163 RTCritSectDelete(&pThis->DevAccessLock);
1164
1165 if (RTCritSectIsInitialized(&pThis->XmitLock))
1166 RTCritSectDelete(&pThis->XmitLock);
1167}
1168
1169
1170/**
1171 * Construct a NAT network transport driver instance.
1172 *
1173 * @copydoc FNPDMDRVCONSTRUCT
1174 */
1175static DECLCALLBACK(int) drvNATConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
1176{
1177 PDRVNAT pThis = PDMINS_2_DATA(pDrvIns, PDRVNAT);
1178 LogFlow(("drvNATConstruct:\n"));
1179 PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
1180
1181 /*
1182 * Validate the config.
1183 */
1184 if (!CFGMR3AreValuesValid(pCfg,
1185 "PassDomain\0TFTPPrefix\0BootFile\0Network"
1186 "\0NextServer\0DNSProxy\0BindIP\0UseHostResolver\0"
1187 "SlirpMTU\0AliasMode\0"
1188 "SockRcv\0SockSnd\0TcpRcv\0TcpSnd\0"
1189 "ICMPCacheLimit\0"
1190 "SoMaxConnection\0"
1191#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1192 "HostResolverMappings\0"
1193#endif
1194 ))
1195 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
1196 N_("Unknown NAT configuration option, only supports PassDomain,"
1197 " TFTPPrefix, BootFile and Network"));
1198
1199 /*
1200 * Init the static parts.
1201 */
1202 pThis->pDrvIns = pDrvIns;
1203 pThis->pNATState = NULL;
1204 pThis->pszTFTPPrefix = NULL;
1205 pThis->pszBootFile = NULL;
1206 pThis->pszNextServer = NULL;
1207 pThis->hSlirpReqQueue = NIL_RTREQQUEUE;
1208 pThis->hUrgRecvReqQueue = NIL_RTREQQUEUE;
1209 pThis->EventRecv = NIL_RTSEMEVENT;
1210 pThis->EventUrgRecv = NIL_RTSEMEVENT;
1211
1212 /* IBase */
1213 pDrvIns->IBase.pfnQueryInterface = drvNATQueryInterface;
1214
1215 /* INetwork */
1216 pThis->INetworkUp.pfnBeginXmit = drvNATNetworkUp_BeginXmit;
1217 pThis->INetworkUp.pfnAllocBuf = drvNATNetworkUp_AllocBuf;
1218 pThis->INetworkUp.pfnFreeBuf = drvNATNetworkUp_FreeBuf;
1219 pThis->INetworkUp.pfnSendBuf = drvNATNetworkUp_SendBuf;
1220 pThis->INetworkUp.pfnEndXmit = drvNATNetworkUp_EndXmit;
1221 pThis->INetworkUp.pfnSetPromiscuousMode = drvNATNetworkUp_SetPromiscuousMode;
1222 pThis->INetworkUp.pfnNotifyLinkChanged = drvNATNetworkUp_NotifyLinkChanged;
1223
1224 /* NAT engine configuration */
1225 pThis->INetworkNATCfg.pfnRedirectRuleCommand = drvNATNetworkNatConfig_RedirectRuleCommand;
1226
1227 /*
1228 * Get the configuration settings.
1229 */
1230 int rc;
1231 bool fPassDomain = true;
1232 GET_BOOL(rc, pThis, pCfg, "PassDomain", fPassDomain);
1233
1234 GET_STRING_ALLOC(rc, pThis, pCfg, "TFTPPrefix", pThis->pszTFTPPrefix);
1235 GET_STRING_ALLOC(rc, pThis, pCfg, "BootFile", pThis->pszBootFile);
1236 GET_STRING_ALLOC(rc, pThis, pCfg, "NextServer", pThis->pszNextServer);
1237
1238 int fDNSProxy = 0;
1239 GET_S32(rc, pThis, pCfg, "DNSProxy", fDNSProxy);
1240 int fUseHostResolver = 0;
1241 GET_S32(rc, pThis, pCfg, "UseHostResolver", fUseHostResolver);
1242 int MTU = 1500;
1243 GET_S32(rc, pThis, pCfg, "SlirpMTU", MTU);
1244 int i32AliasMode = 0;
1245 int i32MainAliasMode = 0;
1246 GET_S32(rc, pThis, pCfg, "AliasMode", i32MainAliasMode);
1247 int iIcmpCacheLimit = 100;
1248 GET_S32(rc, pThis, pCfg, "ICMPCacheLimit", iIcmpCacheLimit);
1249
1250 i32AliasMode |= (i32MainAliasMode & 0x1 ? 0x1 : 0);
1251 i32AliasMode |= (i32MainAliasMode & 0x2 ? 0x40 : 0);
1252 i32AliasMode |= (i32MainAliasMode & 0x4 ? 0x4 : 0);
1253 int i32SoMaxConn = 10;
1254 GET_S32(rc, pThis, pCfg, "SoMaxConnection", i32SoMaxConn);
1255 /*
1256 * Query the network port interface.
1257 */
1258 pThis->pIAboveNet = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKDOWN);
1259 if (!pThis->pIAboveNet)
1260 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1261 N_("Configuration error: the above device/driver didn't "
1262 "export the network port interface"));
1263 pThis->pIAboveConfig = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMINETWORKCONFIG);
1264 if (!pThis->pIAboveConfig)
1265 return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
1266 N_("Configuration error: the above device/driver didn't "
1267 "export the network config interface"));
1268
1269 /* Generate a network address for this network card. */
1270 char szNetwork[32]; /* xxx.xxx.xxx.xxx/yy */
1271 GET_STRING(rc, pThis, pCfg, "Network", szNetwork[0], sizeof(szNetwork));
1272 if (rc == VERR_CFGM_VALUE_NOT_FOUND)
1273 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT%d: Configuration error: "
1274 "missing network"),
1275 pDrvIns->iInstance, szNetwork);
1276
1277 RTIPV4ADDR Network;
1278 RTIPV4ADDR Netmask;
1279 rc = RTCidrStrToIPv4(szNetwork, &Network, &Netmask);
1280 if (RT_FAILURE(rc))
1281 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("NAT#%d: Configuration error: "
1282 "network '%s' describes not a valid IPv4 network"),
1283 pDrvIns->iInstance, szNetwork);
1284
1285 /*
1286 * Initialize slirp.
1287 */
1288 rc = slirp_init(&pThis->pNATState, RT_H2N_U32(Network), Netmask,
1289 fPassDomain, !!fUseHostResolver, i32AliasMode,
1290 iIcmpCacheLimit, pThis);
1291 if (RT_SUCCESS(rc))
1292 {
1293 slirp_set_dhcp_TFTP_prefix(pThis->pNATState, pThis->pszTFTPPrefix);
1294 slirp_set_dhcp_TFTP_bootfile(pThis->pNATState, pThis->pszBootFile);
1295 slirp_set_dhcp_next_server(pThis->pNATState, pThis->pszNextServer);
1296 slirp_set_dhcp_dns_proxy(pThis->pNATState, !!fDNSProxy);
1297 slirp_set_mtu(pThis->pNATState, MTU);
1298 slirp_set_somaxconn(pThis->pNATState, i32SoMaxConn);
1299 char *pszBindIP = NULL;
1300 GET_STRING_ALLOC(rc, pThis, pCfg, "BindIP", pszBindIP);
1301 rc = slirp_set_binding_address(pThis->pNATState, pszBindIP);
1302 if (rc != 0 && pszBindIP && *pszBindIP)
1303 LogRel(("NAT: value of BindIP has been ignored\n"));
1304
1305 if(pszBindIP != NULL)
1306 MMR3HeapFree(pszBindIP);
1307#define SLIRP_SET_TUNING_VALUE(name, setter) \
1308 do \
1309 { \
1310 int len = 0; \
1311 rc = CFGMR3QueryS32(pCfg, name, &len); \
1312 if (RT_SUCCESS(rc)) \
1313 setter(pThis->pNATState, len); \
1314 } while(0)
1315
1316 SLIRP_SET_TUNING_VALUE("SockRcv", slirp_set_rcvbuf);
1317 SLIRP_SET_TUNING_VALUE("SockSnd", slirp_set_sndbuf);
1318 SLIRP_SET_TUNING_VALUE("TcpRcv", slirp_set_tcp_rcvspace);
1319 SLIRP_SET_TUNING_VALUE("TcpSnd", slirp_set_tcp_sndspace);
1320
1321 slirp_register_statistics(pThis->pNATState, pDrvIns);
1322#ifdef VBOX_WITH_STATISTICS
1323# define DRV_PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
1324# define DRV_COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pThis, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
1325# include "counters.h"
1326#endif
1327
1328#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1329 PCFGMNODE pMappingsCfg = CFGMR3GetChild(pCfg, "HostResolverMappings");
1330
1331 if (pMappingsCfg)
1332 {
1333 rc = drvNATConstructDNSMappings(pDrvIns->iInstance, pThis, pMappingsCfg);
1334 AssertRC(rc);
1335 }
1336#endif
1337 rc = drvNATConstructRedir(pDrvIns->iInstance, pThis, pCfg, Network);
1338 if (RT_SUCCESS(rc))
1339 {
1340 /*
1341 * Register a load done notification to get the MAC address into the slirp
1342 * engine after we loaded a guest state.
1343 */
1344 rc = PDMDrvHlpSSMRegisterLoadDone(pDrvIns, drvNATLoadDone);
1345 AssertLogRelRCReturn(rc, rc);
1346
1347 rc = RTReqQueueCreate(&pThis->hSlirpReqQueue);
1348 AssertLogRelRCReturn(rc, rc);
1349
1350 rc = RTReqQueueCreate(&pThis->hRecvReqQueue);
1351 AssertLogRelRCReturn(rc, rc);
1352
1353 rc = RTReqQueueCreate(&pThis->hUrgRecvReqQueue);
1354 AssertLogRelRCReturn(rc, rc);
1355
1356 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pRecvThread, pThis, drvNATRecv,
1357 drvNATRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATRX");
1358 AssertRCReturn(rc, rc);
1359
1360 rc = RTSemEventCreate(&pThis->EventRecv);
1361 AssertRCReturn(rc, rc);
1362
1363 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pUrgRecvThread, pThis, drvNATUrgRecv,
1364 drvNATUrgRecvWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATURGRX");
1365 AssertRCReturn(rc, rc);
1366
1367 rc = RTSemEventCreate(&pThis->EventRecv);
1368 AssertRCReturn(rc, rc);
1369
1370 rc = RTSemEventCreate(&pThis->EventUrgRecv);
1371 AssertRCReturn(rc, rc);
1372
1373 rc = RTCritSectInit(&pThis->DevAccessLock);
1374 AssertRCReturn(rc, rc);
1375
1376 rc = RTCritSectInit(&pThis->XmitLock);
1377 AssertRCReturn(rc, rc);
1378
1379 char szTmp[128];
1380 RTStrPrintf(szTmp, sizeof(szTmp), "nat%d", pDrvIns->iInstance);
1381 PDMDrvHlpDBGFInfoRegister(pDrvIns, szTmp, "NAT info.", drvNATInfo);
1382
1383#ifndef RT_OS_WINDOWS
1384 /*
1385 * Create the control pipe.
1386 */
1387 rc = RTPipeCreate(&pThis->hPipeRead, &pThis->hPipeWrite, 0 /*fFlags*/);
1388 AssertRCReturn(rc, rc);
1389#else
1390 pThis->hWakeupEvent = CreateEvent(NULL, FALSE, FALSE, NULL); /* auto-reset event */
1391 slirp_register_external_event(pThis->pNATState, pThis->hWakeupEvent,
1392 VBOX_WAKEUP_EVENT_INDEX);
1393#endif
1394
1395 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pSlirpThread, pThis, drvNATAsyncIoThread,
1396 drvNATAsyncIoWakeup, 128 * _1K, RTTHREADTYPE_IO, "NAT");
1397 AssertRCReturn(rc, rc);
1398
1399#ifdef VBOX_WITH_SLIRP_MT
1400 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pGuestThread, pThis, drvNATAsyncIoGuest,
1401 drvNATAsyncIoGuestWakeup, 128 * _1K, RTTHREADTYPE_IO, "NATGUEST");
1402 AssertRCReturn(rc, rc);
1403#endif
1404
1405 pThis->enmLinkState = pThis->enmLinkStateWant = PDMNETWORKLINKSTATE_UP;
1406
1407 /* might return VINF_NAT_DNS */
1408 return rc;
1409 }
1410
1411 /* failure path */
1412 slirp_term(pThis->pNATState);
1413 pThis->pNATState = NULL;
1414 }
1415 else
1416 {
1417 PDMDRV_SET_ERROR(pDrvIns, rc, N_("Unknown error during NAT networking setup: "));
1418 AssertMsgFailed(("Add error message for rc=%d (%Rrc)\n", rc, rc));
1419 }
1420
1421 return rc;
1422}
1423
1424
1425/**
1426 * NAT network transport driver registration record.
1427 */
1428const PDMDRVREG g_DrvNAT =
1429{
1430 /* u32Version */
1431 PDM_DRVREG_VERSION,
1432 /* szName */
1433 "NAT",
1434 /* szRCMod */
1435 "",
1436 /* szR0Mod */
1437 "",
1438 /* pszDescription */
1439 "NAT Network Transport Driver",
1440 /* fFlags */
1441 PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1442 /* fClass. */
1443 PDM_DRVREG_CLASS_NETWORK,
1444 /* cMaxInstances */
1445 ~0,
1446 /* cbInstance */
1447 sizeof(DRVNAT),
1448 /* pfnConstruct */
1449 drvNATConstruct,
1450 /* pfnDestruct */
1451 drvNATDestruct,
1452 /* pfnRelocate */
1453 NULL,
1454 /* pfnIOCtl */
1455 NULL,
1456 /* pfnPowerOn */
1457 drvNATPowerOn,
1458 /* pfnReset */
1459 NULL,
1460 /* pfnSuspend */
1461 NULL,
1462 /* pfnResume */
1463 NULL,
1464 /* pfnAttach */
1465 NULL,
1466 /* pfnDetach */
1467 NULL,
1468 /* pfnPowerOff */
1469 NULL,
1470 /* pfnSoftReset */
1471 NULL,
1472 /* u32EndVersion */
1473 PDM_DRVREG_VERSION
1474};
1475
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