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source: vbox/trunk/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.c@ 11982

最後變更 在這個檔案從11982是 11982,由 vboxsync 提交於 16 年 前

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1/* $Id: VBoxNetFlt.c 11982 2008-09-02 13:09:44Z vboxsync $ */
2/** @file
3 * VBoxNetFlt - Network Filter Driver (Host), Common Code.
4 */
5
6/*
7 * Copyright (C) 2008 Sun Microsystems, Inc.
8 *
9 * Sun Microsystems, Inc. confidential
10 * All rights reserved
11 */
12
13/** @page pg_netflt VBoxNetFlt - Network Interface Filter
14 *
15 * This is a kernel module that attaches to a real interface on the host
16 * and filters and injects packets.
17 *
18 * In the big picture we're one of the three trunk interface on the internal
19 * network, the one named "NIC Filter Driver": @image html Networking_Overview.gif
20 *
21 *
22 * @section sec_netflt_msc Locking / Sequence Diagrams
23 *
24 * This secion contains a few sequence diagrams describing the problematic
25 * transitions of a host interface filter instance.
26 *
27 * The thing that makes it all a bit problematic is that multiple events may
28 * happen at the same time, and that we have to be very careful to avoid
29 * deadlocks caused by mixing our locks with the ones in the host kernel.
30 * The main events are receive, send, async send completion, disappearance of
31 * the host networking interface and it's reappearance. The latter two events
32 * are can be caused by driver unloading/loading or the device being physical
33 * unplugged (e.g. a USB network device).
34 *
35 * The strategy for dealing with these issues are:
36 * - Use a simple state machine.
37 * - Require the user (IntNet) to serialize all its calls to us,
38 * while at the same time not owning any lock used by any of the
39 * the callbacks we might call on receive and async send completion.
40 * - Make sure we're 100% idle before disconnecting, and have a
41 * disconnected status on both sides to fend off async calls.
42 * - Protect the host specific interface handle and the state variables
43 * using a spinlock.
44 *
45 *
46 * @subsection subsec_netflt_msc_dis_rel Disconnect from the network and release
47 *
48 * @msc
49 * VM, IntNet, NetFlt, Kernel, Wire;
50 *
51 * VM->IntNet [label="pkt0", linecolor="green", textcolor="green"];
52 * IntNet=>IntNet [label="Lock Network", linecolor="green", textcolor="green" ];
53 * IntNet=>IntNet [label="Route packet -> wire", linecolor="green", textcolor="green" ];
54 * IntNet=>IntNet [label="Unlock Network", linecolor="green", textcolor="green" ];
55 * IntNet=>NetFlt [label="pkt0 to wire", linecolor="green", textcolor="green" ];
56 * NetFlt=>Kernel [label="pkt0 to wire", linecolor="green", textcolor="green"];
57 * Kernel->Wire [label="pkt0 to wire", linecolor="green", textcolor="green"];
58 *
59 * --- [label="Suspending the trunk interface"];
60 * IntNet=>IntNet [label="Lock Network"];
61 *
62 * Wire->Kernel [label="pkt1 - racing us", linecolor="red", textcolor="red"];
63 * Kernel=>>NetFlt [label="pkt1 - racing us", linecolor="red", textcolor="red"];
64 * NetFlt=>>IntNet [label="pkt1 recv - blocks", linecolor="red", textcolor="red"];
65 *
66 * IntNet=>IntNet [label="Mark Trunk Suspended"];
67 * IntNet=>IntNet [label="Unlock Network"];
68 *
69 * IntNet=>NetFlt [label="pfnSetActive(false)"];
70 * NetFlt=>NetFlt [label="Mark inactive (atomic)"];
71 * IntNet<<NetFlt;
72 * IntNet=>NetFlt [label="pfnWaitForIdle(forever)"];
73 *
74 * IntNet=>>NetFlt [label="pkt1 to host", linecolor="red", textcolor="red"];
75 * NetFlt=>>Kernel [label="pkt1 to host", linecolor="red", textcolor="red"];
76 *
77 * Kernel<-Wire [label="pkt0 on wire", linecolor="green", textcolor="green"];
78 * NetFlt<<Kernel [label="pkt0 on wire", linecolor="green", textcolor="green"];
79 * IntNet<<=NetFlt [label="pfnSGRelease", linecolor="green", textcolor="green"];
80 * IntNet<<=IntNet [label="Lock Net, free SG, Unlock Net", linecolor="green", textcolor="green"];
81 * IntNet>>NetFlt [label="pfnSGRelease", linecolor="green", textcolor="green"];
82 * NetFlt<-NetFlt [label="idle", linecolor="green", textcolor="green"];
83 *
84 * IntNet<<NetFlt [label="idle (pfnWaitForIdle)"];
85 *
86 * Wire->Kernel [label="pkt2", linecolor="red", textcolor="red"];
87 * Kernel=>>NetFlt [label="pkt2", linecolor="red", textcolor="red"];
88 * NetFlt=>>Kernel [label="pkt2 to host", linecolor="red", textcolor="red"];
89 *
90 * VM->IntNet [label="pkt3", linecolor="green", textcolor="green"];
91 * IntNet=>IntNet [label="Lock Network", linecolor="green", textcolor="green" ];
92 * IntNet=>IntNet [label="Route packet -> drop", linecolor="green", textcolor="green" ];
93 * IntNet=>IntNet [label="Unlock Network", linecolor="green", textcolor="green" ];
94 *
95 * --- [label="The trunk interface is idle now, disconnect it"];
96 * IntNet=>IntNet [label="Lock Network"];
97 * IntNet=>IntNet [label="Unlink Trunk"];
98 * IntNet=>IntNet [label="Unlock Network"];
99 * IntNet=>NetFlt [label="pfnDisconnectAndRelease"];
100 * NetFlt=>Kernel [label="iflt_detach"];
101 * NetFlt<<=Kernel [label="iff_detached"];
102 * NetFlt>>Kernel [label="iff_detached"];
103 * NetFlt<<Kernel [label="iflt_detach"];
104 * NetFlt=>NetFlt [label="Release"];
105 * IntNet<<NetFlt [label="pfnDisconnectAndRelease"];
106 *
107 * @endmsc
108 *
109 *
110 *
111 * @subsection subsec_netflt_msc_hif_rm Host Interface Removal
112 *
113 * The ifnet_t (pIf) is a tricky customer as any reference to it can potentially
114 * race the filter detaching. The simple way of solving it on Darwin is to guard
115 * all access to the pIf member with a spinlock. The other host systems will
116 * probably have similar race conditions, so the spinlock is a generic thing.
117 *
118 * @msc
119 * VM, IntNet, NetFlt, Kernel;
120 *
121 * VM->IntNet [label="pkt0", linecolor="green", textcolor="green"];
122 * IntNet=>IntNet [label="Lock Network", linecolor="green", textcolor="green" ];
123 * IntNet=>IntNet [label="Route packet -> wire", linecolor="green", textcolor="green" ];
124 * IntNet=>IntNet [label="Unlock Network", linecolor="green", textcolor="green" ];
125 * IntNet=>NetFlt [label="pkt0 to wire", linecolor="green", textcolor="green" ];
126 * NetFlt=>Kernel [label="ifnet_reference w/ spinlock", linecolor="green", textcolor="green" ];
127 * NetFlt<<Kernel [label="ifnet_reference", linecolor="green", textcolor="green" ];
128 * NetFlt=>Kernel [label="pkt0 to wire (blocks)", linecolor="green", textcolor="green" ];
129 *
130 * --- [label="The host interface is being disconnected"];
131 * Kernel->NetFlt [label="iff_detached"];
132 * NetFlt=>Kernel [label="ifnet_release w/ spinlock"];
133 * NetFlt<<Kernel [label="ifnet_release"];
134 * NetFlt=>NetFlt [label="fDisconnectedFromHost=true"];
135 * NetFlt>>Kernel [label="iff_detached"];
136 *
137 * NetFlt<<Kernel [label="dropped", linecolor="green", textcolor="green"];
138 * NetFlt=>NetFlt [label="Acquire spinlock", linecolor="green", textcolor="green"];
139 * NetFlt=>Kernel [label="ifnet_release", linecolor="green", textcolor="green"];
140 * NetFlt<<Kernel [label="ifnet_release", linecolor="green", textcolor="green"];
141 * NetFlt=>NetFlt [label="pIf=NULL", linecolor="green", textcolor="green"];
142 * NetFlt=>NetFlt [label="Release spinlock", linecolor="green", textcolor="green"];
143 * IntNet<=NetFlt [label="pfnSGRelease", linecolor="green", textcolor="green"];
144 * IntNet>>NetFlt [label="pfnSGRelease", linecolor="green", textcolor="green"];
145 * IntNet<<NetFlt [label="pkt0 to wire", linecolor="green", textcolor="green"];
146 *
147 * @endmsc
148 *
149 *
150 *
151 * @subsection subsec_netflt_msc_hif_rm Host Interface Rediscovery
152 *
153 * The rediscovery is performed when we receive a send request and a certain
154 * period have elapsed since the last attempt, i.e. we're polling it. We
155 * synchronize the rediscovery with disconnection from the internal network
156 * by means of the pfnWaitForIdle call, so no special handling is required.
157 *
158 * @msc
159 * VM2, VM1, IntNet, NetFlt, Kernel, Wire;
160 *
161 * --- [label="Rediscovery conditions are not met"];
162 * VM1->IntNet [label="pkt0"];
163 * IntNet=>IntNet [label="Lock Network"];
164 * IntNet=>IntNet [label="Route packet -> wire"];
165 * IntNet=>IntNet [label="Unlock Network"];
166 * IntNet=>NetFlt [label="pkt0 to wire"];
167 * NetFlt=>NetFlt [label="Read pIf(==NULL) w/ spinlock"];
168 * IntNet<<NetFlt [label="pkt0 to wire (dropped)"];
169 *
170 * --- [label="Rediscovery conditions"];
171 * VM1->IntNet [label="pkt1"];
172 * IntNet=>IntNet [label="Lock Network"];
173 * IntNet=>IntNet [label="Route packet -> wire"];
174 * IntNet=>IntNet [label="Unlock Network"];
175 * IntNet=>NetFlt [label="pkt1 to wire"];
176 * NetFlt=>NetFlt [label="Read pIf(==NULL) w/ spinlock"];
177 * NetFlt=>NetFlt [label="fRediscoveryPending=true w/ spinlock"];
178 * NetFlt=>Kernel [label="ifnet_find_by_name"];
179 * NetFlt<<Kernel [label="ifnet_find_by_name (success)"];
180 *
181 * VM2->IntNet [label="pkt2", linecolor="red", textcolor="red"];
182 * IntNet=>IntNet [label="Lock Network", linecolor="red", textcolor="red"];
183 * IntNet=>IntNet [label="Route packet -> wire", linecolor="red", textcolor="red"];
184 * IntNet=>IntNet [label="Unlock Network", linecolor="red", textcolor="red"];
185 * IntNet=>NetFlt [label="pkt2 to wire", linecolor="red", textcolor="red"];
186 * NetFlt=>NetFlt [label="!pIf || fRediscoveryPending (w/ spinlock)", linecolor="red", textcolor="red"];
187 * IntNet<<NetFlt [label="pkt2 to wire (dropped)", linecolor="red", textcolor="red"];
188
189 * NetFlt=>Kernel [label="iflt_attach"];
190 * NetFlt<<Kernel [label="iflt_attach (success)"];
191 * NetFlt=>NetFlt [label="Acquire spinlock"];
192 * NetFlt=>NetFlt [label="Set pIf and update flags"];
193 * NetFlt=>NetFlt [label="Release spinlock"];
194 *
195 * NetFlt=>Kernel [label="pkt1 to wire"];
196 * Kernel->Wire [label="pkt1 to wire"];
197 * NetFlt<<Kernel [label="pkt1 to wire"];
198 * IntNet<<NetFlt [label="pkt1 to wire"];
199 *
200 *
201 * @endmsc
202 *
203 */
204
205/*******************************************************************************
206* Header Files *
207*******************************************************************************/
208#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
209#include "VBoxNetFltInternal.h"
210
211#include <VBox/sup.h>
212#include <VBox/log.h>
213#include <VBox/err.h>
214#include <iprt/assert.h>
215#include <iprt/mem.h>
216#include <iprt/string.h>
217#include <iprt/spinlock.h>
218#include <iprt/semaphore.h>
219#include <iprt/time.h>
220#include <iprt/uuid.h>
221
222#ifdef VBOXNETFLT_STATIC_CONFIG
223# error "The static setup needs a full check up wrt assumptions and incomplete code."
224#endif
225
226
227/*******************************************************************************
228* Defined Constants And Macros *
229*******************************************************************************/
230#define IFPORT_2_VBOXNETFLTINS(pIfPort) \
231 ( (PVBOXNETFLTINS)((uint8_t *)pIfPort - RT_OFFSETOF(VBOXNETFLTINS, MyPort)) )
232
233
234/**
235 * Finds a instance by its name, the caller does the locking.
236 *
237 *
238 * @returns Pointer to the instance by the given name. NULL if not found.
239 * @param pGlobals The globals.
240 * @param pszName The name of the instance.
241 */
242static PVBOXNETFLTINS vboxNetFltFindInstanceLocked(PVBOXNETFLTGLOBALS pGlobals, const char *pszName)
243{
244 PVBOXNETFLTINS pCur;
245 for (pCur = pGlobals->pInstanceHead; pCur; pCur = pCur->pNext)
246 if (!strcmp(pszName, pCur->szName))
247 return pCur;
248 return NULL;
249}
250
251
252/**
253 * Finds a instance by its name, will request the mutex.
254 *
255 * @returns Pointer to the instance by the given name. NULL if not found.
256 * @param pGlobals The globals.
257 * @param pszName The name of the instance.
258 */
259DECLHIDDEN(PVBOXNETFLTINS) vboxNetFltFindInstance(PVBOXNETFLTGLOBALS pGlobals, const char *pszName)
260{
261 PVBOXNETFLTINS pRet;
262 int rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
263 AssertRCReturn(rc, NULL);
264
265 pRet = vboxNetFltFindInstanceLocked(pGlobals, pszName);
266
267 rc = RTSemFastMutexRelease(pGlobals->hFastMtx);
268 AssertRC(rc);
269 return pRet;
270}
271
272
273/**
274 * Unlinks an instance from the chain.
275 *
276 * @param pGlobals The globals.
277 * @param pToUnlink The instance to unlink.
278 */
279static void vboxNetFltUnlinkLocked(PVBOXNETFLTGLOBALS pGlobals, PVBOXNETFLTINS pToUnlink)
280{
281 if (pGlobals->pInstanceHead == pToUnlink)
282 pGlobals->pInstanceHead = pToUnlink->pNext;
283 else
284 {
285 PVBOXNETFLTINS pCur;
286 for (pCur = pGlobals->pInstanceHead; pCur; pCur = pCur->pNext)
287 if (pCur->pNext == pToUnlink)
288 {
289 pCur->pNext = pToUnlink->pNext;
290 break;
291 }
292 Assert(pCur);
293 }
294 pToUnlink->pNext = NULL;
295}
296
297
298AssertCompileMemberSize(VBOXNETFLTINS, enmState, sizeof(uint32_t));
299
300/**
301 * Sets the enmState member atomically.
302 *
303 * Used for all updates.
304 *
305 * @param pThis The instance.
306 * @param enmNewState The new value.
307 */
308DECLINLINE(void) vboxNetFltSetState(PVBOXNETFLTINS pThis, VBOXNETFTLINSSTATE enmNewState)
309{
310 ASMAtomicWriteU32((uint32_t volatile *)&pThis->enmState, enmNewState);
311}
312
313
314/**
315 * Gets the enmState member atomically.
316 *
317 * Used for all reads.
318 *
319 * @returns The enmState value.
320 * @param pThis The instance.
321 */
322DECLINLINE(VBOXNETFTLINSSTATE) vboxNetFltGetState(PVBOXNETFLTINS pThis)
323{
324 return (VBOXNETFTLINSSTATE)ASMAtomicUoReadU32((uint32_t volatile *)&pThis->enmState);
325}
326
327
328/**
329 * Performs interface rediscovery if it was disconnected from the host.
330 *
331 * @returns true if successfully rediscovered and connected, false if not.
332 * @param pThis The instance.
333 */
334static bool vboxNetFltMaybeRediscovered(PVBOXNETFLTINS pThis)
335{
336 RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
337 uint64_t Now = RTTimeNanoTS();
338 bool fRediscovered;
339 bool fDoIt;
340
341 /*
342 * Rediscovered already? Time to try again?
343 */
344 RTSpinlockAcquire(pThis->hSpinlock, &Tmp);
345
346 fRediscovered = !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
347 fDoIt = !fRediscovered
348 && !ASMAtomicUoReadBool(&pThis->fRediscoveryPending)
349 && Now - ASMAtomicUoReadU64(&pThis->NanoTSLastRediscovery) > UINT64_C(5000000000); /* 5 sec */
350 if (fDoIt)
351 ASMAtomicWriteBool(&pThis->fRediscoveryPending, true);
352
353 RTSpinlockRelease(pThis->hSpinlock, &Tmp);
354
355 /*
356 * Call the OS specific code to do the job.
357 * Update the state when the call returns, that is everything except for
358 * the fDisconnectedFromHost flag which the OS specific code shall set.
359 */
360 if (fDoIt)
361 {
362 fRediscovered = vboxNetFltOsMaybeRediscovered(pThis);
363
364 Assert(!fRediscovered || !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost));
365
366 ASMAtomicUoWriteU64(&pThis->NanoTSLastRediscovery, RTTimeNanoTS());
367 ASMAtomicWriteBool(&pThis->fRediscoveryPending, false);
368
369 if (fRediscovered)
370 vboxNetFltPortOsSetActive(pThis, pThis->fActive);
371 }
372
373 return fRediscovered;
374}
375
376
377/**
378 * @copydoc INTNETTRUNKIFPORT::pfnXmit
379 */
380static DECLCALLBACK(int) vboxNetFltPortXmit(PINTNETTRUNKIFPORT pIfPort, PINTNETSG pSG, uint32_t fDst)
381{
382 PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
383 int rc;
384
385 /*
386 * Input validation.
387 */
388 AssertPtr(pThis);
389 AssertPtr(pSG);
390 Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
391 AssertReturn(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected, VERR_INVALID_STATE);
392 Assert(pThis->fActive);
393
394 /*
395 * Do a busy retain and then make sure we're connected to the interface
396 * before invoking the OS specific code.
397 */
398 vboxNetFltRetain(pThis, true /* fBusy */);
399 if ( !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost)
400 || vboxNetFltMaybeRediscovered(pThis))
401 rc = vboxNetFltPortOsXmit(pThis, pSG, fDst);
402 vboxNetFltRelease(pThis, true /* fBusy */);
403
404 return rc;
405}
406
407
408/**
409 * @copydoc INTNETTRUNKIFPORT::pfnIsPromiscuous
410 */
411static DECLCALLBACK(bool) vboxNetFltPortIsPromiscuous(PINTNETTRUNKIFPORT pIfPort)
412{
413 PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
414
415 /*
416 * Input validation.
417 */
418 AssertPtr(pThis);
419 Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
420 Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected);
421 Assert(pThis->fActive);
422
423 /*
424 * Ask the OS specific code.
425 */
426 return vboxNetFltPortOsIsPromiscuous(pThis);
427}
428
429
430/**
431 * @copydoc INTNETTRUNKIFPORT::pfnGetMacAddress
432 */
433static DECLCALLBACK(void) vboxNetFltPortGetMacAddress(PINTNETTRUNKIFPORT pIfPort, PRTMAC pMac)
434{
435 PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
436
437 /*
438 * Input validation.
439 */
440 AssertPtr(pThis);
441 Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
442 Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected);
443 Assert(pThis->fActive);
444
445 /*
446 * Forward the question to the OS specific code.
447 */
448 vboxNetFltPortOsGetMacAddress(pThis, pMac);
449}
450
451
452/**
453 * @copydoc INTNETTRUNKIFPORT::pfnIsHostMac
454 */
455static DECLCALLBACK(bool) vboxNetFltPortIsHostMac(PINTNETTRUNKIFPORT pIfPort, PCRTMAC pMac)
456{
457 PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
458
459 /*
460 * Input validation.
461 */
462 AssertPtr(pThis);
463 Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
464 Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected);
465 Assert(pThis->fActive);
466
467 /*
468 * Ask the OS specific code.
469 */
470 return vboxNetFltPortOsIsHostMac(pThis, pMac);
471}
472
473
474/**
475 * @copydoc INTNETTRUNKIFPORT::pfnWaitForIdle
476 */
477static DECLCALLBACK(int) vboxNetFltPortWaitForIdle(PINTNETTRUNKIFPORT pIfPort, uint32_t cMillies)
478{
479 PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
480 int rc;
481
482 /*
483 * Input validation.
484 */
485 AssertPtr(pThis);
486 Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
487 AssertReturn(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected, VERR_INVALID_STATE);
488 AssertReturn(!pThis->fActive, VERR_INVALID_STATE);
489
490 /*
491 * Go to sleep on the semaphore after checking the busy count.
492 */
493 vboxNetFltRetain(pThis, false /* fBusy */);
494
495 rc = VINF_SUCCESS;
496 while (pThis->cBusy && RT_SUCCESS(rc))
497 rc = RTSemEventWait(pThis->hEventIdle, cMillies); /** @todo make interruptible? */
498
499 vboxNetFltRelease(pThis, false /* fBusy */);
500
501 return rc;
502}
503
504
505/**
506 * @copydoc INTNETTRUNKIFPORT::pfnSetActive
507 */
508static DECLCALLBACK(bool) vboxNetFltPortSetActive(PINTNETTRUNKIFPORT pIfPort, bool fActive)
509{
510 PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
511
512 /*
513 * Input validation.
514 */
515 AssertPtr(pThis);
516 AssertPtr(pThis->pGlobals);
517 Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
518 AssertReturn(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected, false);
519
520 /*
521 * We're assuming that the caller is serializing the calls, so we don't
522 * have to be extremely careful here. Just update first and then call
523 * the OS specific code, the update must be serialized for various reasons.
524 */
525 if (ASMAtomicReadBool(&pThis->fActive) != fActive)
526 {
527 RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
528 RTSpinlockAcquire(pThis->hSpinlock, &Tmp);
529 ASMAtomicWriteBool(&pThis->fActive, fActive);
530 RTSpinlockRelease(pThis->hSpinlock, &Tmp);
531
532 vboxNetFltPortOsSetActive(pThis, fActive);
533 }
534 else
535 fActive = !fActive;
536 return !fActive;
537}
538
539
540/**
541 * @copydoc INTNETTRUNKIFPORT::pfnDisconnectAndRelease
542 */
543static DECLCALLBACK(void) vboxNetFltPortDisconnectAndRelease(PINTNETTRUNKIFPORT pIfPort)
544{
545 PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
546 RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
547
548 /*
549 * Serious paranoia.
550 */
551 AssertPtr(pThis);
552 Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
553 Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
554 AssertPtr(pThis->pGlobals);
555 Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
556 Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
557 Assert(pThis->szName[0]);
558
559 Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected);
560 Assert(!pThis->fActive);
561 Assert(!pThis->fRediscoveryPending);
562 Assert(!pThis->cBusy);
563
564 /*
565 * Disconnect and release it.
566 */
567 RTSpinlockAcquire(pThis->hSpinlock, &Tmp);
568 vboxNetFltSetState(pThis, kVBoxNetFltInsState_Disconnecting);
569 RTSpinlockRelease(pThis->hSpinlock, &Tmp);
570
571 vboxNetFltOsDisconnectIt(pThis);
572 pThis->pSwitchPort = NULL;
573
574 vboxNetFltRelease(pThis, false /* fBusy */);
575}
576
577
578/**
579 * Destroy a device that has been disconnected from the switch.
580 *
581 * @param pThis The instance to be destroyed. This is
582 * no longer valid when this function returns.
583 */
584static void vboxNetFltDestroyInstance(PVBOXNETFLTINS pThis)
585{
586 PVBOXNETFLTGLOBALS pGlobals = pThis->pGlobals;
587 int rc;
588 LogFlow(("vboxNetFltDestroyInstance: pThis=%p (%s)\n", pThis, pThis->szName));
589
590 /*
591 * Validate the state.
592 */
593#ifdef VBOXNETFLT_STATIC_CONFIG
594 Assert( vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Disconnecting
595 || vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Unconnected);
596#else
597 Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Disconnecting);
598#endif
599 Assert(!pThis->fActive);
600 Assert(!pThis->fRediscoveryPending);
601 Assert(!pThis->cRefs);
602 Assert(!pThis->cBusy);
603 Assert(!pThis->pSwitchPort);
604
605 /*
606 * Make sure the state is 'disconnecting' and let the OS specific code
607 * do its part of the cleanup outside the mutex.
608 */
609 rc = RTSemFastMutexRequest(pGlobals->hFastMtx); AssertRC(rc);
610 vboxNetFltSetState(pThis, kVBoxNetFltInsState_Disconnecting);
611 RTSemFastMutexRelease(pGlobals->hFastMtx);
612
613 vboxNetFltOsDeleteInstance(pThis);
614
615 /*
616 * Unlink the instance and free up its resources.
617 */
618 rc = RTSemFastMutexRequest(pGlobals->hFastMtx); AssertRC(rc);
619 vboxNetFltSetState(pThis, kVBoxNetFltInsState_Destroyed);
620 vboxNetFltUnlinkLocked(pGlobals, pThis);
621 RTSemFastMutexRelease(pGlobals->hFastMtx);
622
623 RTSemEventDestroy(pThis->hEventIdle);
624 pThis->hEventIdle = NIL_RTSEMEVENT;
625 RTSpinlockDestroy(pThis->hSpinlock);
626 pThis->hSpinlock = NIL_RTSPINLOCK;
627 RTMemFree(pThis);
628}
629
630
631/**
632 * Releases a reference to the specified instance.
633 *
634 * This method will destroy the instance when the count reaches 0.
635 * It will also take care of decrementing the counter and idle wakeup.
636 *
637 * @param pThis The instance.
638 * @param fBusy Whether the busy counter should be decremented too.
639 */
640DECLHIDDEN(void) vboxNetFltRelease(PVBOXNETFLTINS pThis, bool fBusy)
641{
642 uint32_t cRefs;
643
644 /*
645 * Paranoid Android.
646 */
647 AssertPtr(pThis);
648 Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
649 Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
650 Assert( vboxNetFltGetState(pThis) > kVBoxNetFltInsState_Invalid
651 && vboxNetFltGetState(pThis) < kVBoxNetFltInsState_Destroyed);
652 AssertPtr(pThis->pGlobals);
653 Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
654 Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
655 Assert(pThis->szName[0]);
656
657 /*
658 * Work the busy counter.
659 */
660 if (fBusy)
661 {
662 cRefs = ASMAtomicDecU32(&pThis->cBusy);
663 if (!cRefs)
664 {
665 int rc = RTSemEventSignal(pThis->hEventIdle);
666 AssertRC(rc);
667 }
668 else
669 Assert(cRefs < UINT32_MAX / 2);
670 }
671
672 /*
673 * The object reference counting.
674 */
675 cRefs = ASMAtomicDecU32(&pThis->cRefs);
676 if (!cRefs)
677 vboxNetFltDestroyInstance(pThis);
678 else
679 Assert(cRefs < UINT32_MAX / 2);
680}
681
682
683/**
684 * @copydoc INTNETTRUNKIFPORT::pfnRetain
685 */
686static DECLCALLBACK(void) vboxNetFltPortRelease(PINTNETTRUNKIFPORT pIfPort)
687{
688 PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
689 vboxNetFltRelease(pThis, false /* fBusy */);
690}
691
692
693/**
694 * Retains a reference to the specified instance and a busy reference too.
695 *
696 * @param pThis The instance.
697 * @param fBusy Whether the busy counter should be incremented as well.
698 */
699DECLHIDDEN(void) vboxNetFltRetain(PVBOXNETFLTINS pThis, bool fBusy)
700{
701 uint32_t cRefs;
702
703 /*
704 * Paranoid Android.
705 */
706 AssertPtr(pThis);
707 Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
708 Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
709 Assert( vboxNetFltGetState(pThis) > kVBoxNetFltInsState_Invalid
710 && vboxNetFltGetState(pThis) < kVBoxNetFltInsState_Destroyed);
711 AssertPtr(pThis->pGlobals);
712 Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
713 Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
714 Assert(pThis->szName[0]);
715
716 /*
717 * Retain the object.
718 */
719 cRefs = ASMAtomicIncU32(&pThis->cRefs);
720 Assert(cRefs > 0 && cRefs < UINT32_MAX / 2);
721
722 /*
723 * Work the busy counter.
724 */
725 if (fBusy)
726 {
727 cRefs = ASMAtomicIncU32(&pThis->cBusy);
728 Assert(cRefs > 0 && cRefs < UINT32_MAX / 2);
729 }
730
731 NOREF(cRefs);
732}
733
734
735/**
736 * @copydoc INTNETTRUNKIFPORT::pfnRetain
737 */
738static DECLCALLBACK(void) vboxNetFltPortRetain(PINTNETTRUNKIFPORT pIfPort)
739{
740 PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
741 vboxNetFltRetain(pThis, false /* fBusy */);
742}
743
744
745/**
746 * Connects the instance to the specified switch port.
747 *
748 * Called while owning the lock. We're ASSUMING that the internal
749 * networking code is already owning an recursive mutex, so, there
750 * will be no deadlocks when vboxNetFltOsConnectIt calls back into
751 * it for setting preferences.
752 *
753 * @returns VBox status code.
754 * @param pThis The instance.
755 * @param pSwitchPort The port on the internal network 'switch'.
756 * @param ppIfPort Where to return our port interface.
757 */
758static int vboxNetFltConnectIt(PVBOXNETFLTINS pThis, PINTNETTRUNKSWPORT pSwitchPort, PINTNETTRUNKIFPORT *ppIfPort)
759{
760 int rc;
761
762 /*
763 * Validate state.
764 */
765 Assert(!pThis->fActive);
766 Assert(!pThis->fRediscoveryPending);
767 Assert(!pThis->cBusy);
768#ifdef VBOXNETFLT_STATIC_CONFIG
769 Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Unconnected);
770#else
771 Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Initializing);
772#endif
773
774 /*
775 * Do the job.
776 * Note that we're calling the os stuff while owning the semaphore here.
777 */
778 pThis->pSwitchPort = pSwitchPort;
779 rc = vboxNetFltOsConnectIt(pThis);
780 if (RT_SUCCESS(rc))
781 vboxNetFltSetState(pThis, kVBoxNetFltInsState_Connected);
782 else
783 pThis->pSwitchPort = NULL;
784
785 Assert(!pThis->fActive);
786 return rc;
787}
788
789
790/**
791 * Creates a new instance.
792 *
793 * The new instance will be in the suspended state in a dynamic config and in
794 * the inactive in a static one.
795 *
796 * Called without owning the lock, but will request is several times.
797 *
798 * @returns VBox status code.
799 * @param pGlobals The globals.
800 * @param pszName The instance name.
801 * @param pSwitchPort The port on the switch that we're connected with (dynamic only).
802 * @param ppIfPort Where to store the pointer to our port interface (dynamic only).
803 */
804static int vboxNetFltNewInstance(PVBOXNETFLTGLOBALS pGlobals, const char *pszName, PINTNETTRUNKSWPORT pSwitchPort, PINTNETTRUNKIFPORT *ppIfPort)
805{
806 /*
807 * Allocate and initialize a new instance before requesting the mutex.
808 */
809 int rc;
810 size_t const cchName = strlen(pszName);
811 PVBOXNETFLTINS pNew = (PVBOXNETFLTINS)RTMemAllocZ(RT_OFFSETOF(VBOXNETFLTINS, szName[cchName + 1]));
812 if (!pNew)
813 return VERR_INTNET_FLT_IF_FAILED;
814 pNew->pNext = NULL;
815 pNew->MyPort.u32Version = INTNETTRUNKIFPORT_VERSION;
816 pNew->MyPort.pfnRetain = vboxNetFltPortRetain;
817 pNew->MyPort.pfnRelease = vboxNetFltPortRelease;
818 pNew->MyPort.pfnDisconnectAndRelease= vboxNetFltPortDisconnectAndRelease;
819 pNew->MyPort.pfnSetActive = vboxNetFltPortSetActive;
820 pNew->MyPort.pfnWaitForIdle = vboxNetFltPortWaitForIdle;
821 pNew->MyPort.pfnGetMacAddress = vboxNetFltPortGetMacAddress;
822 pNew->MyPort.pfnIsHostMac = vboxNetFltPortIsHostMac;
823 pNew->MyPort.pfnIsPromiscuous = vboxNetFltPortIsPromiscuous;
824 pNew->MyPort.pfnXmit = vboxNetFltPortXmit;
825 pNew->MyPort.u32VersionEnd = INTNETTRUNKIFPORT_VERSION;
826 pNew->pSwitchPort = NULL;
827 pNew->pGlobals = pGlobals;
828 pNew->hSpinlock = NIL_RTSPINLOCK;
829 pNew->enmState = kVBoxNetFltInsState_Initializing;
830 pNew->fActive = false;
831 pNew->fDisconnectedFromHost = false;
832 pNew->fRediscoveryPending = false;
833 pNew->NanoTSLastRediscovery = INT64_MAX;
834 pNew->cRefs = 1;
835 pNew->cBusy = 0;
836 pNew->hEventIdle = NIL_RTSEMEVENT;
837 memcpy(pNew->szName, pszName, cchName + 1);
838
839 rc = RTSpinlockCreate(&pNew->hSpinlock);
840 if (RT_SUCCESS(rc))
841 {
842 rc = RTSemEventCreate(&pNew->hEventIdle);
843 if (RT_SUCCESS(rc))
844 {
845 rc = vboxNetFltOsPreInitInstance(pNew);
846 if (RT_SUCCESS(rc))
847 {
848 /*
849 * Insert the instance into the chain, checking for
850 * duplicates first of course (race).
851 */
852 rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
853 if (RT_SUCCESS(rc))
854 {
855 if (!vboxNetFltFindInstanceLocked(pGlobals, pszName))
856 {
857 pNew->pNext = pGlobals->pInstanceHead;
858 pGlobals->pInstanceHead = pNew;
859 RTSemFastMutexRelease(pGlobals->hFastMtx);
860
861 /*
862 * Call the OS specific initialization code.
863 */
864 rc = vboxNetFltOsInitInstance(pNew);
865 RTSemFastMutexRequest(pGlobals->hFastMtx);
866 if (RT_SUCCESS(rc))
867 {
868#ifdef VBOXNETFLT_STATIC_CONFIG
869 pNew->enmState = kVBoxNetFltInsState_Inactive;
870 Assert(!pSwitchPort); Assert(!ppIfPort);
871 RTSemFastMutexRelease(pGlobals->hFastMtx);
872 return rc;
873
874#else
875 /*
876 * Connect it as well, the OS specific bits has to be done outside
877 * the lock as they may call back to into intnet.
878 */
879 rc = vboxNetFltConnectIt(pNew, pSwitchPort, ppIfPort);
880 if (RT_SUCCESS(rc))
881 {
882 RTSemFastMutexRelease(pGlobals->hFastMtx);
883 *ppIfPort = &pNew->MyPort;
884 return rc;
885 }
886
887 /* Bail out (failed). */
888 vboxNetFltOsDeleteInstance(pNew);
889#endif
890 }
891 vboxNetFltUnlinkLocked(pGlobals, pNew);
892 }
893 else
894 rc = VERR_INTNET_FLT_IF_BUSY;
895 RTSemFastMutexRelease(pGlobals->hFastMtx);
896 }
897 }
898 RTSemEventDestroy(pNew->hEventIdle);
899 }
900 RTSpinlockDestroy(pNew->hSpinlock);
901 }
902
903 RTMemFree(pNew);
904 return rc;
905}
906
907
908/**
909 * @copydoc INTNETTRUNKNETFLTFACTORY::pfnCreateAndConnect
910 */
911static DECLCALLBACK(int) vboxNetFltFactoryCreateAndConnect(PINTNETTRUNKFACTORY pIfFactory, const char *pszName,
912 PINTNETTRUNKSWPORT pSwitchPort, PINTNETTRUNKIFPORT *ppIfPort)
913{
914 PVBOXNETFLTGLOBALS pGlobals = (PVBOXNETFLTGLOBALS)((uint8_t *)pIfFactory - RT_OFFSETOF(VBOXNETFLTGLOBALS, TrunkFactory));
915 PVBOXNETFLTINS pCur;
916 int rc;
917
918 LogFlow(("vboxNetFltFactoryCreateAndConnect: pszName=%p:{%s}\n", pszName, pszName));
919 Assert(pGlobals->cFactoryRefs > 0);
920
921 /*
922 * Static: Find instance, check if busy, connect if not.
923 * Dynamic: Check for duplicate / busy interface instance.
924 */
925 rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
926 AssertRCReturn(rc, rc);
927
928 pCur = vboxNetFltFindInstanceLocked(pGlobals, pszName);
929 if (pCur)
930 {
931 rc = VERR_INTNET_FLT_IF_BUSY;
932#ifdef VBOXNETFLT_STATIC_CONFIG
933 if (vboxNetFltGetState(pCur) == kVBoxNetFltInsState_Unconnected)
934 rc = vboxNetFltConnectIt(pCur, pSwitchPort, ppIfPort);
935#endif
936 RTSemFastMutexRelease(pGlobals->hFastMtx);
937 LogFlow(("vboxNetFltFactoryCreateAndConnect: returns %Rrc\n", rc));
938 return rc;
939 }
940
941 RTSemFastMutexRelease(pGlobals->hFastMtx);
942
943#ifdef VBOXNETFLT_STATIC_CONFIG
944 rc = VERR_INTNET_FLT_IF_NOT_FOUND;
945#else
946 /*
947 * Dynamically create a new instance.
948 */
949 rc = vboxNetFltNewInstance(pGlobals, pszName, pSwitchPort, ppIfPort);
950#endif
951 LogFlow(("vboxNetFltFactoryCreateAndConnect: returns %Rrc\n", rc));
952 return rc;
953}
954
955
956/**
957 * @copydoc INTNETTRUNKNETFLTFACTORY::pfnRelease
958 */
959static DECLCALLBACK(void) vboxNetFltFactoryRelease(PINTNETTRUNKFACTORY pIfFactory)
960{
961 PVBOXNETFLTGLOBALS pGlobals = (PVBOXNETFLTGLOBALS)((uint8_t *)pIfFactory - RT_OFFSETOF(VBOXNETFLTGLOBALS, TrunkFactory));
962
963 int32_t cRefs = ASMAtomicDecS32(&pGlobals->cFactoryRefs);
964 Assert(cRefs >= 0); NOREF(cRefs);
965 LogFlow(("vboxNetFltFactoryRelease: cRefs=%d (new)\n", cRefs));
966}
967
968
969/**
970 * Implements the SUPDRV component factor interface query method.
971 *
972 * @returns Pointer to an interface. NULL if not supported.
973 *
974 * @param pSupDrvFactory Pointer to the componet factory registration structure.
975 * @param pSession The session - unused.
976 * @param pszInterfaceUuid The factory interface id.
977 */
978static DECLCALLBACK(void *) vboxNetFltQueryFactoryInterface(PCSUPDRVFACTORY pSupDrvFactory, PSUPDRVSESSION pSession, const char *pszInterfaceUuid)
979{
980 PVBOXNETFLTGLOBALS pGlobals = (PVBOXNETFLTGLOBALS)((uint8_t *)pSupDrvFactory - RT_OFFSETOF(VBOXNETFLTGLOBALS, SupDrvFactory));
981
982 /*
983 * Convert the UUID strings and compare them.
984 */
985 RTUUID UuidReq;
986 int rc = RTUuidFromStr(&UuidReq, pszInterfaceUuid);
987 if (RT_SUCCESS(rc))
988 {
989 if (!RTUuidCompareStr(&UuidReq, INTNETTRUNKFACTORY_UUID_STR))
990 {
991 ASMAtomicIncS32(&pGlobals->cFactoryRefs);
992 return &pGlobals->TrunkFactory;
993 }
994#ifdef LOG_ENABLED
995 /* log legacy queries */
996 /* else if (!RTUuidCompareStr(&UuidReq, INTNETTRUNKFACTORY_V1_UUID_STR))
997 Log(("VBoxNetFlt: V1 factory query\n"));
998 */
999 else
1000 Log(("VBoxNetFlt: unknown factory interface query (%s)\n", pszInterfaceUuid));
1001#endif
1002 }
1003 else
1004 Log(("VBoxNetFlt: rc=%Rrc, uuid=%s\n", rc, pszInterfaceUuid));
1005
1006 return NULL;
1007}
1008
1009
1010/**
1011 * Checks whether the VBoxNetFlt wossname can be unloaded.
1012 *
1013 * This will return false if someone is currently using the module.
1014 *
1015 * @returns true if it's relatively safe to unload it, otherwise false.
1016 * @param pGlobals Pointer to the globals.
1017 */
1018DECLHIDDEN(bool) vboxNetFltCanUnload(PVBOXNETFLTGLOBALS pGlobals)
1019{
1020 int rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
1021 bool fRc = !pGlobals->pInstanceHead
1022 && pGlobals->cFactoryRefs <= 0;
1023 RTSemFastMutexRelease(pGlobals->hFastMtx);
1024 AssertRC(rc);
1025 return fRc;
1026}
1027
1028
1029/**
1030 * Called by the native part when the OS wants the driver to unload.
1031 *
1032 * @returns VINF_SUCCESS on succes, VERR_WRONG_ORDER if we're busy.
1033 *
1034 * @param pGlobals Pointer to the globals.
1035 */
1036DECLHIDDEN(int) vboxNetFltTryDeleteGlobals(PVBOXNETFLTGLOBALS pGlobals)
1037{
1038 int rc;
1039 Assert(pGlobals->hFastMtx != NIL_RTSEMFASTMUTEX);
1040
1041 /*
1042 * Check before trying to deregister the factory.
1043 */
1044 if (!vboxNetFltCanUnload(pGlobals))
1045 return VERR_WRONG_ORDER;
1046
1047 /*
1048 * Disconnect from SUPDRV and check that nobody raced us,
1049 * reconnect if that should happen.
1050 */
1051 rc = SUPR0IdcComponentDeregisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
1052 AssertRC(rc);
1053 if (!vboxNetFltCanUnload(pGlobals))
1054 {
1055 rc = SUPR0IdcComponentRegisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
1056 AssertRC(rc);
1057 return VERR_WRONG_ORDER;
1058 }
1059
1060 SUPR0IdcClose(&pGlobals->SupDrvIDC);
1061
1062 /*
1063 * Release resources.
1064 */
1065 RTSemFastMutexDestroy(pGlobals->hFastMtx);
1066 pGlobals->hFastMtx = NIL_RTSEMFASTMUTEX;
1067
1068 return VINF_SUCCESS;
1069}
1070
1071
1072/**
1073 * Called by the native driver/kext module initialization routine.
1074 *
1075 * It will initialize the common parts of the globals, assuming the caller
1076 * has already taken care of the OS specific bits.
1077 *
1078 * @returns VBox status code.
1079 * @param pGlobals Pointer to the globals.
1080 */
1081DECLHIDDEN(int) vboxNetFltInitGlobals(PVBOXNETFLTGLOBALS pGlobals)
1082{
1083 /*
1084 * Initialize the common portions of the structure.
1085 */
1086 int rc = RTSemFastMutexCreate(&pGlobals->hFastMtx);
1087 if (RT_SUCCESS(rc))
1088 {
1089 pGlobals->pInstanceHead = NULL;
1090
1091 pGlobals->TrunkFactory.pfnRelease = vboxNetFltFactoryRelease;
1092 pGlobals->TrunkFactory.pfnCreateAndConnect = vboxNetFltFactoryCreateAndConnect;
1093
1094 strcpy(pGlobals->SupDrvFactory.szName, "VBoxNetFlt");
1095 pGlobals->SupDrvFactory.pfnQueryFactoryInterface = vboxNetFltQueryFactoryInterface;
1096
1097 /*
1098 * Establish a connection to SUPDRV and register our component factory.
1099 */
1100 rc = SUPR0IdcOpen(&pGlobals->SupDrvIDC, 0 /* iReqVersion = default */, 0 /* iMinVersion = default */, NULL, NULL, NULL);
1101 if (RT_SUCCESS(rc))
1102 {
1103 rc = SUPR0IdcComponentRegisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
1104 if (RT_SUCCESS(rc))
1105 {
1106 Log(("VBoxNetFlt: pSession=%p\n", SUPR0IdcGetSession(&pGlobals->SupDrvIDC)));
1107 return rc;
1108 }
1109
1110 /* bail out. */
1111 LogRel(("VBoxNetFlt: Failed to register component factory, rc=%Rrc\n", rc));
1112 SUPR0IdcClose(&pGlobals->SupDrvIDC);
1113 }
1114 RTSemFastMutexDestroy(pGlobals->hFastMtx);
1115 pGlobals->hFastMtx = NIL_RTSEMFASTMUTEX;
1116 }
1117
1118 return rc;
1119}
1120
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