VBoxNetFlt.c@ 96586

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1	/* $Id: VBoxNetFlt.c 96407 2022-08-22 17:43:14Z vboxsync $ */
2	/** @file
3	* VBoxNetFlt - Network Filter Driver (Host), Common Code.
4	*/
5
6	/*
7	* Copyright (C) 2008-2022 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37	/** @page pg_netflt VBoxNetFlt - Network Interface Filter
38	*
39	* This is a kernel module that attaches to a real interface on the host and
40	* filters and injects packets.
41	*
42	* In the big picture we're one of the three trunk interface on the internal
43	* network, the one named "NIC Filter Driver": @image html Networking_Overview.gif
44	*
45	*
46	* @section sec_netflt_locking Locking and Potential Races
47	*
48	* The main challenge here is to make sure the netfilter and internal network
49	* instances won't be destroyed while someone is calling into them.
50	*
51	* The main calls into or out of of the filter driver are:
52	* - Send.
53	* - Async send completion (not implemented yet)
54	* - Release by the internal network.
55	* - Receive.
56	* - Disappearance of the host networking interface.
57	* - Reappearance of the host networking interface.
58	*
59	* The latter two calls are can be caused by driver unloading/loading or the
60	* device being physical unplugged (e.g. a USB network device). Actually, the
61	* unload scenario must fervently be prevent as it will cause panics because the
62	* internal network will assume the trunk is around until it releases it.
63	* @todo Need to figure which host allow unloading and block/fix it.
64	*
65	* Currently the netfilter instance lives until the internal network releases
66	* it. So, it is the internal networks responsibility to make sure there are no
67	* active calls when it releases the trunk and destroys the network. The
68	* netfilter assists in this by providing INTNETTRUNKIFPORT::pfnSetState and
69	* INTNETTRUNKIFPORT::pfnWaitForIdle. The trunk state is used to enable/disable
70	* promiscuous mode on the hardware NIC (or similar activation) as well
71	* indicating that disconnect is imminent and no further calls shall be made
72	* into the internal network. After changing the state to disconnecting and
73	* prior to invoking INTNETTRUNKIFPORT::pfnDisconnectAndRelease, the internal
74	* network will use INTNETTRUNKIFPORT::pfnWaitForIdle to wait for any still
75	* active calls to complete.
76	*
77	* The netfilter employs a busy counter and an internal state in addition to the
78	* public trunk state. All these variables are protected using a spinlock.
79	*
80	*
81	* @section sec_netflt_msc Locking / Sequence Diagrams - OBSOLETE
82	*
83	* !OBSOLETE! - THIS WAS THE OLD APPROACH!
84	*
85	* This secion contains a few sequence diagrams describing the problematic
86	* transitions of a host interface filter instance.
87	*
88	* The thing that makes it all a bit problematic is that multiple events may
89	* happen at the same time, and that we have to be very careful to avoid
90	* deadlocks caused by mixing our locks with the ones in the host kernel. The
91	* main events are receive, send, async send completion, disappearance of the
92	* host networking interface and its reappearance. The latter two events are
93	* can be caused by driver unloading/loading or the device being physical
94	* unplugged (e.g. a USB network device).
95	*
96	* The strategy for dealing with these issues are:
97	* - Use a simple state machine.
98	* - Require the user (IntNet) to serialize all its calls to us,
99	* while at the same time not owning any lock used by any of the
100	* the callbacks we might call on receive and async send completion.
101	* - Make sure we're 100% idle before disconnecting, and have a
102	* disconnected status on both sides to fend off async calls.
103	* - Protect the host specific interface handle and the state variables
104	* using a spinlock.
105	*
106	*
107	* @subsection subsec_netflt_msc_dis_rel Disconnect from the network and release - OBSOLETE
108	*
109	* @msc
110	* VM, IntNet, NetFlt, Kernel, Wire;
111	*
112	* VM->IntNet [label="pkt0", linecolor="green", textcolor="green"];
113	* IntNet=>IntNet [label="Lock Network", linecolor="green", textcolor="green" ];
114	* IntNet=>IntNet [label="Route packet -> wire", linecolor="green", textcolor="green" ];
115	* IntNet=>IntNet [label="Unlock Network", linecolor="green", textcolor="green" ];
116	* IntNet=>NetFlt [label="pkt0 to wire", linecolor="green", textcolor="green" ];
117	* NetFlt=>Kernel [label="pkt0 to wire", linecolor="green", textcolor="green"];
118	* Kernel->Wire [label="pkt0 to wire", linecolor="green", textcolor="green"];
119	*
120	* --- [label="Suspending the trunk interface"];
121	* IntNet=>IntNet [label="Lock Network"];
122	*
123	* Wire->Kernel [label="pkt1 - racing us", linecolor="red", textcolor="red"];
124	* Kernel=>>NetFlt [label="pkt1 - racing us", linecolor="red", textcolor="red"];
125	* NetFlt=>>IntNet [label="pkt1 recv - blocks", linecolor="red", textcolor="red"];
126	*
127	* IntNet=>IntNet [label="Mark Trunk Suspended"];
128	* IntNet=>IntNet [label="Unlock Network"];
129	*
130	* IntNet=>NetFlt [label="pfnSetActive(false)"];
131	* NetFlt=>NetFlt [label="Mark inactive (atomic)"];
132	* IntNet<<NetFlt;
133	* IntNet=>NetFlt [label="pfnWaitForIdle(forever)"];
134	*
135	* IntNet=>>NetFlt [label="pkt1 to host", linecolor="red", textcolor="red"];
136	* NetFlt=>>Kernel [label="pkt1 to host", linecolor="red", textcolor="red"];
137	*
138	* Kernel<-Wire [label="pkt0 on wire", linecolor="green", textcolor="green"];
139	* NetFlt<<Kernel [label="pkt0 on wire", linecolor="green", textcolor="green"];
140	* IntNet<<=NetFlt [label="pfnSGRelease", linecolor="green", textcolor="green"];
141	* IntNet<<=IntNet [label="Lock Net, free SG, Unlock Net", linecolor="green", textcolor="green"];
142	* IntNet>>NetFlt [label="pfnSGRelease", linecolor="green", textcolor="green"];
143	* NetFlt<-NetFlt [label="idle", linecolor="green", textcolor="green"];
144	*
145	* IntNet<<NetFlt [label="idle (pfnWaitForIdle)"];
146	*
147	* Wire->Kernel [label="pkt2", linecolor="red", textcolor="red"];
148	* Kernel=>>NetFlt [label="pkt2", linecolor="red", textcolor="red"];
149	* NetFlt=>>Kernel [label="pkt2 to host", linecolor="red", textcolor="red"];
150	*
151	* VM->IntNet [label="pkt3", linecolor="green", textcolor="green"];
152	* IntNet=>IntNet [label="Lock Network", linecolor="green", textcolor="green" ];
153	* IntNet=>IntNet [label="Route packet -> drop", linecolor="green", textcolor="green" ];
154	* IntNet=>IntNet [label="Unlock Network", linecolor="green", textcolor="green" ];
155	*
156	* --- [label="The trunk interface is idle now, disconnect it"];
157	* IntNet=>IntNet [label="Lock Network"];
158	* IntNet=>IntNet [label="Unlink Trunk"];
159	* IntNet=>IntNet [label="Unlock Network"];
160	* IntNet=>NetFlt [label="pfnDisconnectAndRelease"];
161	* NetFlt=>Kernel [label="iflt_detach"];
162	* NetFlt<<=Kernel [label="iff_detached"];
163	* NetFlt>>Kernel [label="iff_detached"];
164	* NetFlt<<Kernel [label="iflt_detach"];
165	* NetFlt=>NetFlt [label="Release"];
166	* IntNet<<NetFlt [label="pfnDisconnectAndRelease"];
167	*
168	* @endmsc
169	*
170	*
171	*
172	* @subsection subsec_netflt_msc_hif_rm Host Interface Removal - OBSOLETE
173	*
174	* The ifnet_t (pIf) is a tricky customer as any reference to it can potentially
175	* race the filter detaching. The simple way of solving it on Darwin is to guard
176	* all access to the pIf member with a spinlock. The other host systems will
177	* probably have similar race conditions, so the spinlock is a generic thing.
178	*
179	* @msc
180	* VM, IntNet, NetFlt, Kernel;
181	*
182	* VM->IntNet [label="pkt0", linecolor="green", textcolor="green"];
183	* IntNet=>IntNet [label="Lock Network", linecolor="green", textcolor="green" ];
184	* IntNet=>IntNet [label="Route packet -> wire", linecolor="green", textcolor="green" ];
185	* IntNet=>IntNet [label="Unlock Network", linecolor="green", textcolor="green" ];
186	* IntNet=>NetFlt [label="pkt0 to wire", linecolor="green", textcolor="green" ];
187	* NetFlt=>Kernel [label="ifnet_reference w/ spinlock", linecolor="green", textcolor="green" ];
188	* NetFlt<<Kernel [label="ifnet_reference", linecolor="green", textcolor="green" ];
189	* NetFlt=>Kernel [label="pkt0 to wire (blocks)", linecolor="green", textcolor="green" ];
190	*
191	* --- [label="The host interface is being disconnected"];
192	* Kernel->NetFlt [label="iff_detached"];
193	* NetFlt=>Kernel [label="ifnet_release w/ spinlock"];
194	* NetFlt<<Kernel [label="ifnet_release"];
195	* NetFlt=>NetFlt [label="fDisconnectedFromHost=true"];
196	* NetFlt>>Kernel [label="iff_detached"];
197	*
198	* NetFlt<<Kernel [label="dropped", linecolor="green", textcolor="green"];
199	* NetFlt=>NetFlt [label="Acquire spinlock", linecolor="green", textcolor="green"];
200	* NetFlt=>Kernel [label="ifnet_release", linecolor="green", textcolor="green"];
201	* NetFlt<<Kernel [label="ifnet_release", linecolor="green", textcolor="green"];
202	* NetFlt=>NetFlt [label="pIf=NULL", linecolor="green", textcolor="green"];
203	* NetFlt=>NetFlt [label="Release spinlock", linecolor="green", textcolor="green"];
204	* IntNet<=NetFlt [label="pfnSGRelease", linecolor="green", textcolor="green"];
205	* IntNet>>NetFlt [label="pfnSGRelease", linecolor="green", textcolor="green"];
206	* IntNet<<NetFlt [label="pkt0 to wire", linecolor="green", textcolor="green"];
207	*
208	* @endmsc
209	*
210	*
211	*
212	* @subsection subsec_netflt_msc_hif_rd Host Interface Rediscovery - OBSOLETE
213	*
214	* The rediscovery is performed when we receive a send request and a certain
215	* period have elapsed since the last attempt, i.e. we're polling it. We
216	* synchronize the rediscovery with disconnection from the internal network
217	* by means of the pfnWaitForIdle call, so no special handling is required.
218	*
219	* @msc
220	* VM2, VM1, IntNet, NetFlt, Kernel, Wire;
221	*
222	* --- [label="Rediscovery conditions are not met"];
223	* VM1->IntNet [label="pkt0"];
224	* IntNet=>IntNet [label="Lock Network"];
225	* IntNet=>IntNet [label="Route packet -> wire"];
226	* IntNet=>IntNet [label="Unlock Network"];
227	* IntNet=>NetFlt [label="pkt0 to wire"];
228	* NetFlt=>NetFlt [label="Read pIf(==NULL) w/ spinlock"];
229	* IntNet<<NetFlt [label="pkt0 to wire (dropped)"];
230	*
231	* --- [label="Rediscovery conditions"];
232	* VM1->IntNet [label="pkt1"];
233	* IntNet=>IntNet [label="Lock Network"];
234	* IntNet=>IntNet [label="Route packet -> wire"];
235	* IntNet=>IntNet [label="Unlock Network"];
236	* IntNet=>NetFlt [label="pkt1 to wire"];
237	* NetFlt=>NetFlt [label="Read pIf(==NULL) w/ spinlock"];
238	* NetFlt=>NetFlt [label="fRediscoveryPending=true w/ spinlock"];
239	* NetFlt=>Kernel [label="ifnet_find_by_name"];
240	* NetFlt<<Kernel [label="ifnet_find_by_name (success)"];
241	*
242	* VM2->IntNet [label="pkt2", linecolor="red", textcolor="red"];
243	* IntNet=>IntNet [label="Lock Network", linecolor="red", textcolor="red"];
244	* IntNet=>IntNet [label="Route packet -> wire", linecolor="red", textcolor="red"];
245	* IntNet=>IntNet [label="Unlock Network", linecolor="red", textcolor="red"];
246	* IntNet=>NetFlt [label="pkt2 to wire", linecolor="red", textcolor="red"];
247	* NetFlt=>NetFlt [label="!pIf \|\| fRediscoveryPending (w/ spinlock)", linecolor="red", textcolor="red"];
248	* IntNet<<NetFlt [label="pkt2 to wire (dropped)", linecolor="red", textcolor="red"];
249
250	* NetFlt=>Kernel [label="iflt_attach"];
251	* NetFlt<<Kernel [label="iflt_attach (success)"];
252	* NetFlt=>NetFlt [label="Acquire spinlock"];
253	* NetFlt=>NetFlt [label="Set pIf and update flags"];
254	* NetFlt=>NetFlt [label="Release spinlock"];
255	*
256	* NetFlt=>Kernel [label="pkt1 to wire"];
257	* Kernel->Wire [label="pkt1 to wire"];
258	* NetFlt<<Kernel [label="pkt1 to wire"];
259	* IntNet<<NetFlt [label="pkt1 to wire"];
260	*
261	*
262	* @endmsc
263	*
264	*/
265
266
267	/*********************************************************************************************************************************
268	* Header Files *
269	*********************************************************************************************************************************/
270	#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
271	#include "VBoxNetFltInternal.h"
272
273	#include <VBox/sup.h>
274	#include <VBox/log.h>
275	#include <VBox/err.h>
276	#include <iprt/assert.h>
277	#include <iprt/string.h>
278	#include <iprt/spinlock.h>
279	#include <iprt/uuid.h>
280	#include <iprt/mem.h>
281	#include <iprt/time.h>
282	#include <iprt/semaphore.h>
283	#include <iprt/thread.h>
284
285
286	/*********************************************************************************************************************************
287	* Defined Constants And Macros *
288	*********************************************************************************************************************************/
289	#define IFPORT_2_VBOXNETFLTINS(pIfPort) \
290	( (PVBOXNETFLTINS)((uint8_t *)(pIfPort) - RT_UOFFSETOF(VBOXNETFLTINS, MyPort)) )
291
292
293	AssertCompileMemberSize(VBOXNETFLTINS, enmState, sizeof(uint32_t));
294
295	/**
296	* Sets the enmState member atomically.
297	*
298	* Used for all updates.
299	*
300	* @param pThis The instance.
301	* @param enmNewState The new value.
302	*/
303	DECLINLINE(void) vboxNetFltSetState(PVBOXNETFLTINS pThis, VBOXNETFTLINSSTATE enmNewState)
304	{
305	ASMAtomicWriteU32((uint32_t volatile *)&pThis->enmState, enmNewState);
306	}
307
308
309	/**
310	* Gets the enmState member atomically.
311	*
312	* Used for all reads.
313	*
314	* @returns The enmState value.
315	* @param pThis The instance.
316	*/
317	DECLINLINE(VBOXNETFTLINSSTATE) vboxNetFltGetState(PVBOXNETFLTINS pThis)
318	{
319	return (VBOXNETFTLINSSTATE)ASMAtomicUoReadU32((uint32_t volatile *)&pThis->enmState);
320	}
321
322
323	/**
324	* Finds a instance by its name, the caller does the locking.
325	*
326	* @returns Pointer to the instance by the given name. NULL if not found.
327	* @param pGlobals The globals.
328	* @param pszName The name of the instance.
329	*/
330	static PVBOXNETFLTINS vboxNetFltFindInstanceLocked(PVBOXNETFLTGLOBALS pGlobals, const char *pszName)
331	{
332	PVBOXNETFLTINS pCur;
333	for (pCur = pGlobals->pInstanceHead; pCur; pCur = pCur->pNext)
334	if (!strcmp(pszName, pCur->szName))
335	return pCur;
336	return NULL;
337	}
338
339
340	/**
341	* Finds a instance by its name, will request the mutex.
342	*
343	* No reference to the instance is retained, we're assuming the caller to
344	* already have one but just for some reason doesn't have the pointer to it.
345	*
346	* @returns Pointer to the instance by the given name. NULL if not found.
347	* @param pGlobals The globals.
348	* @param pszName The name of the instance.
349	*/
350	DECLHIDDEN(PVBOXNETFLTINS) vboxNetFltFindInstance(PVBOXNETFLTGLOBALS pGlobals, const char *pszName)
351	{
352	PVBOXNETFLTINS pRet;
353	int rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
354	AssertRCReturn(rc, NULL);
355
356	pRet = vboxNetFltFindInstanceLocked(pGlobals, pszName);
357
358	rc = RTSemFastMutexRelease(pGlobals->hFastMtx);
359	AssertRC(rc);
360	return pRet;
361	}
362
363
364	/**
365	* Unlinks an instance from the chain.
366	*
367	* @param pGlobals The globals.
368	* @param pToUnlink The instance to unlink.
369	*/
370	static void vboxNetFltUnlinkLocked(PVBOXNETFLTGLOBALS pGlobals, PVBOXNETFLTINS pToUnlink)
371	{
372	if (pGlobals->pInstanceHead == pToUnlink)
373	pGlobals->pInstanceHead = pToUnlink->pNext;
374	else
375	{
376	PVBOXNETFLTINS pCur;
377	for (pCur = pGlobals->pInstanceHead; pCur; pCur = pCur->pNext)
378	if (pCur->pNext == pToUnlink)
379	{
380	pCur->pNext = pToUnlink->pNext;
381	break;
382	}
383	Assert(pCur);
384	}
385	pToUnlink->pNext = NULL;
386	}
387
388
389	/**
390	* Performs interface rediscovery if it was disconnected from the host.
391	*
392	* @returns true if successfully rediscovered and connected, false if not.
393	* @param pThis The instance.
394	*/
395	static bool vboxNetFltMaybeRediscovered(PVBOXNETFLTINS pThis)
396	{
397	uint64_t Now;
398	bool fRediscovered;
399	bool fDoIt;
400
401	/*
402	* Don't do rediscovery if we're called with preemption disabled.
403	*
404	* Note! This may cause trouble if we're always called with preemption
405	* disabled and vboxNetFltOsMaybeRediscovered actually does some real
406	* work. For the time being though, only Darwin and FreeBSD depends
407	* on these call outs and neither supports sending with preemption
408	* disabled.
409	*/
410	if (!RTThreadPreemptIsEnabled(NIL_RTTHREAD))
411	return false;
412
413	/*
414	* Rediscovered already? Time to try again?
415	*/
416	Now = RTTimeNanoTS();
417	RTSpinlockAcquire(pThis->hSpinlock);
418
419	fRediscovered = !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
420	fDoIt = !fRediscovered
421	&& !ASMAtomicUoReadBool(&pThis->fRediscoveryPending)
422	&& Now - ASMAtomicUoReadU64(&pThis->NanoTSLastRediscovery) > UINT64_C(5000000000); /* 5 sec */
423	if (fDoIt)
424	ASMAtomicWriteBool(&pThis->fRediscoveryPending, true);
425
426	RTSpinlockRelease(pThis->hSpinlock);
427
428	/*
429	* Call the OS specific code to do the job.
430	* Update the state when the call returns, that is everything except for
431	* the fDisconnectedFromHost flag which the OS specific code shall set.
432	*/
433	if (fDoIt)
434	{
435	fRediscovered = vboxNetFltOsMaybeRediscovered(pThis);
436
437	Assert(!fRediscovered \|\| !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost));
438
439	ASMAtomicUoWriteU64(&pThis->NanoTSLastRediscovery, RTTimeNanoTS());
440	ASMAtomicWriteBool(&pThis->fRediscoveryPending, false);
441
442	if (fRediscovered)
443	/** @todo this isn't 100% serialized. */
444	vboxNetFltPortOsSetActive(pThis, pThis->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE);
445	}
446
447	return fRediscovered;
448	}
449
450
451	/**
452	* @copydoc INTNETTRUNKIFPORT::pfnXmit
453	*/
454	static DECLCALLBACK(int) vboxNetFltPortXmit(PINTNETTRUNKIFPORT pIfPort, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
455	{
456	PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
457	int rc = VINF_SUCCESS;
458
459	/*
460	* Input validation.
461	*/
462	AssertPtr(pThis);
463	AssertPtr(pSG);
464	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
465	AssertReturn(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected, VERR_INVALID_STATE);
466
467	/*
468	* Do a busy retain and then make sure we're connected to the interface
469	* before invoking the OS specific code.
470	*/
471	if (RT_LIKELY(vboxNetFltTryRetainBusyActive(pThis)))
472	{
473	if ( !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost)
474	\|\| vboxNetFltMaybeRediscovered(pThis))
475	rc = vboxNetFltPortOsXmit(pThis, pvIfData, pSG, fDst);
476	vboxNetFltRelease(pThis, true /* fBusy */);
477	}
478
479	return rc;
480	}
481
482
483	/**
484	* @copydoc INTNETTRUNKIFPORT::pfnWaitForIdle
485	*/
486	static DECLCALLBACK(int) vboxNetFltPortWaitForIdle(PINTNETTRUNKIFPORT pIfPort, uint32_t cMillies)
487	{
488	PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
489	int rc;
490
491	/*
492	* Input validation.
493	*/
494	AssertPtr(pThis);
495	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
496	AssertReturn(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected, VERR_INVALID_STATE);
497	AssertReturn(pThis->enmTrunkState == INTNETTRUNKIFSTATE_DISCONNECTING, VERR_INVALID_STATE);
498
499	/*
500	* Go to sleep on the semaphore after checking the busy count.
501	*/
502	vboxNetFltRetain(pThis, false /* fBusy */);
503
504	rc = VINF_SUCCESS;
505	while (pThis->cBusy && RT_SUCCESS(rc))
506	rc = RTSemEventWait(pThis->hEventIdle, cMillies); /** @todo make interruptible? */
507
508	vboxNetFltRelease(pThis, false /* fBusy */);
509
510	return rc;
511	}
512
513
514	/**
515	* @copydoc INTNETTRUNKIFPORT::pfnSetState
516	*/
517	static DECLCALLBACK(INTNETTRUNKIFSTATE) vboxNetFltPortSetState(PINTNETTRUNKIFPORT pIfPort, INTNETTRUNKIFSTATE enmState)
518	{
519	PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
520	INTNETTRUNKIFSTATE enmOldTrunkState;
521
522	/*
523	* Input validation.
524	*/
525	AssertPtr(pThis);
526	AssertPtr(pThis->pGlobals);
527	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
528	AssertReturn(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected, INTNETTRUNKIFSTATE_INVALID);
529	AssertReturn(enmState > INTNETTRUNKIFSTATE_INVALID && enmState < INTNETTRUNKIFSTATE_END,
530	INTNETTRUNKIFSTATE_INVALID);
531
532	/*
533	* Take the lock and change the state.
534	*/
535	RTSpinlockAcquire(pThis->hSpinlock);
536	enmOldTrunkState = pThis->enmTrunkState;
537	if (enmOldTrunkState != enmState)
538	ASMAtomicWriteU32((uint32_t volatile *)&pThis->enmTrunkState, enmState);
539	RTSpinlockRelease(pThis->hSpinlock);
540
541	/*
542	* If the state change indicates that the trunk has become active or
543	* inactive, call the OS specific part so they can work the promiscuous
544	* settings and such.
545	* Note! The caller makes sure there are no concurrent pfnSetState calls.
546	*/
547	if ((enmOldTrunkState == INTNETTRUNKIFSTATE_ACTIVE) != (enmState == INTNETTRUNKIFSTATE_ACTIVE))
548	vboxNetFltPortOsSetActive(pThis, (enmState == INTNETTRUNKIFSTATE_ACTIVE));
549
550	return enmOldTrunkState;
551	}
552
553
554	/**
555	* @copydoc INTNETTRUNKIFPORT::pfnNotifyMacAddress
556	*/
557	static DECLCALLBACK(void) vboxNetFltPortNotifyMacAddress(PINTNETTRUNKIFPORT pIfPort, void *pvIfData, PCRTMAC pMac)
558	{
559	PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
560
561	/*
562	* Input validation.
563	*/
564	AssertPtr(pThis);
565	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
566
567	vboxNetFltRetain(pThis, false /* fBusy */);
568	vboxNetFltPortOsNotifyMacAddress(pThis, pvIfData, pMac);
569	vboxNetFltRelease(pThis, false /* fBusy */);
570	}
571
572
573	/**
574	* @copydoc INTNETTRUNKIFPORT::pfnConnectInterface
575	*/
576	static DECLCALLBACK(int) vboxNetFltPortConnectInterface(PINTNETTRUNKIFPORT pIfPort, void pvIf, void *ppvIfData)
577	{
578	PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
579	int rc;
580
581	/*
582	* Input validation.
583	*/
584	AssertPtr(pThis);
585	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
586
587	vboxNetFltRetain(pThis, false /* fBusy */);
588	rc = vboxNetFltPortOsConnectInterface(pThis, pvIf, ppvIfData);
589	vboxNetFltRelease(pThis, false /* fBusy */);
590
591	return rc;
592	}
593
594
595	/**
596	* @copydoc INTNETTRUNKIFPORT::pfnDisconnectInterface
597	*/
598	static DECLCALLBACK(void) vboxNetFltPortDisconnectInterface(PINTNETTRUNKIFPORT pIfPort, void *pvIfData)
599	{
600	PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
601	int rc;
602
603	/*
604	* Input validation.
605	*/
606	AssertPtr(pThis);
607	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
608
609	vboxNetFltRetain(pThis, false /* fBusy */);
610	rc = vboxNetFltPortOsDisconnectInterface(pThis, pvIfData);
611	vboxNetFltRelease(pThis, false /* fBusy */);
612	AssertRC(rc); /** @todo fix vboxNetFltPortOsDisconnectInterface. */
613	}
614
615
616	/**
617	* @copydoc INTNETTRUNKIFPORT::pfnDisconnectAndRelease
618	*/
619	static DECLCALLBACK(void) vboxNetFltPortDisconnectAndRelease(PINTNETTRUNKIFPORT pIfPort)
620	{
621	PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
622
623	/*
624	* Serious paranoia.
625	*/
626	AssertPtr(pThis);
627	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
628	Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
629	AssertPtr(pThis->pGlobals);
630	Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
631	Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
632	Assert(pThis->szName[0]);
633
634	Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected);
635	Assert(pThis->enmTrunkState == INTNETTRUNKIFSTATE_DISCONNECTING);
636	Assert(!pThis->fRediscoveryPending);
637	Assert(!pThis->cBusy);
638
639	/*
640	* Disconnect and release it.
641	*/
642	RTSpinlockAcquire(pThis->hSpinlock);
643	vboxNetFltSetState(pThis, kVBoxNetFltInsState_Disconnecting);
644	RTSpinlockRelease(pThis->hSpinlock);
645
646	vboxNetFltOsDisconnectIt(pThis);
647	pThis->pSwitchPort = NULL;
648
649	#ifdef VBOXNETFLT_STATIC_CONFIG
650	RTSpinlockAcquire(pThis->hSpinlock);
651	vboxNetFltSetState(pThis, kVBoxNetFltInsState_Unconnected);
652	RTSpinlockRelease(pThis->hSpinlock);
653	#endif
654
655	vboxNetFltRelease(pThis, false /* fBusy */);
656	}
657
658
659	/**
660	* Destroy a device that has been disconnected from the switch.
661	*
662	* @returns true if the instance is destroyed, false otherwise.
663	* @param pThis The instance to be destroyed. This is
664	* no longer valid when this function returns.
665	*/
666	static bool vboxNetFltDestroyInstance(PVBOXNETFLTINS pThis)
667	{
668	PVBOXNETFLTGLOBALS pGlobals = pThis->pGlobals;
669	uint32_t cRefs = ASMAtomicUoReadU32((uint32_t volatile *)&pThis->cRefs);
670	int rc;
671	LogFlow(("vboxNetFltDestroyInstance: pThis=%p (%s)\n", pThis, pThis->szName));
672
673	/*
674	* Validate the state.
675	*/
676	#ifdef VBOXNETFLT_STATIC_CONFIG
677	Assert( vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Disconnecting
678	\|\| vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Unconnected);
679	#else
680	Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Disconnecting);
681	#endif
682	Assert(pThis->enmTrunkState == INTNETTRUNKIFSTATE_DISCONNECTING);
683	Assert(!pThis->fRediscoveryPending);
684	Assert(!pThis->cRefs);
685	Assert(!pThis->cBusy);
686	Assert(!pThis->pSwitchPort);
687
688	/*
689	* Make sure the state is 'disconnecting' / 'destroying' and let the OS
690	* specific code do its part of the cleanup outside the mutex.
691	*/
692	rc = RTSemFastMutexRequest(pGlobals->hFastMtx); AssertRC(rc);
693	vboxNetFltSetState(pThis, kVBoxNetFltInsState_Disconnecting);
694	RTSemFastMutexRelease(pGlobals->hFastMtx);
695
696	vboxNetFltOsDeleteInstance(pThis);
697
698	/*
699	* Unlink the instance and free up its resources.
700	*/
701	rc = RTSemFastMutexRequest(pGlobals->hFastMtx); AssertRC(rc);
702	vboxNetFltSetState(pThis, kVBoxNetFltInsState_Destroyed);
703	vboxNetFltUnlinkLocked(pGlobals, pThis);
704	RTSemFastMutexRelease(pGlobals->hFastMtx);
705
706	RTSemEventDestroy(pThis->hEventIdle);
707	pThis->hEventIdle = NIL_RTSEMEVENT;
708	RTSpinlockDestroy(pThis->hSpinlock);
709	pThis->hSpinlock = NIL_RTSPINLOCK;
710	RTMemFree(pThis);
711
712	NOREF(cRefs);
713
714	return true;
715	}
716
717
718	/**
719	* Releases a reference to the specified instance.
720	*
721	* This method will destroy the instance when the count reaches 0.
722	* It will also take care of decrementing the counter and idle wakeup.
723	*
724	* @param pThis The instance.
725	* @param fBusy Whether the busy counter should be decremented too.
726	*/
727	DECLHIDDEN(void) vboxNetFltRelease(PVBOXNETFLTINS pThis, bool fBusy)
728	{
729	uint32_t cRefs;
730
731	/*
732	* Paranoid Android.
733	*/
734	AssertPtr(pThis);
735	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
736	Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
737	Assert( vboxNetFltGetState(pThis) > kVBoxNetFltInsState_Invalid
738	&& vboxNetFltGetState(pThis) < kVBoxNetFltInsState_Destroyed);
739	AssertPtr(pThis->pGlobals);
740	Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
741	Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
742	Assert(pThis->szName[0]);
743
744	/*
745	* Work the busy counter.
746	*/
747	if (fBusy)
748	{
749	cRefs = ASMAtomicDecU32(&pThis->cBusy);
750	if (!cRefs)
751	{
752	int rc = RTSemEventSignal(pThis->hEventIdle);
753	AssertRC(rc);
754	}
755	else
756	Assert(cRefs < UINT32_MAX / 2);
757	}
758
759	/*
760	* The object reference counting.
761	*/
762	cRefs = ASMAtomicDecU32(&pThis->cRefs);
763	if (!cRefs)
764	vboxNetFltDestroyInstance(pThis);
765	else
766	Assert(cRefs < UINT32_MAX / 2);
767	}
768
769
770	/**
771	* @copydoc INTNETTRUNKIFPORT::pfnRelease
772	*/
773	static DECLCALLBACK(void) vboxNetFltPortRelease(PINTNETTRUNKIFPORT pIfPort)
774	{
775	PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
776	vboxNetFltRelease(pThis, false /* fBusy */);
777	}
778
779
780	/**
781	* @callback_method_impl{FNINTNETTRUNKIFPORTRELEASEBUSY}
782	*/
783	DECL_HIDDEN_CALLBACK(void) vboxNetFltPortReleaseBusy(PINTNETTRUNKIFPORT pIfPort)
784	{
785	PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
786	vboxNetFltRelease(pThis, true /fBusy/);
787	}
788
789
790	/**
791	* Retains a reference to the specified instance and a busy reference too.
792	*
793	* @param pThis The instance.
794	* @param fBusy Whether the busy counter should be incremented as well.
795	*/
796	DECLHIDDEN(void) vboxNetFltRetain(PVBOXNETFLTINS pThis, bool fBusy)
797	{
798	uint32_t cRefs;
799
800	/*
801	* Paranoid Android.
802	*/
803	AssertPtr(pThis);
804	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
805	Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
806	Assert( vboxNetFltGetState(pThis) > kVBoxNetFltInsState_Invalid
807	&& vboxNetFltGetState(pThis) < kVBoxNetFltInsState_Destroyed);
808	AssertPtr(pThis->pGlobals);
809	Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
810	Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
811	Assert(pThis->szName[0]);
812
813	/*
814	* Retain the object.
815	*/
816	cRefs = ASMAtomicIncU32(&pThis->cRefs);
817	Assert(cRefs > 1 && cRefs < UINT32_MAX / 2);
818
819	/*
820	* Work the busy counter.
821	*/
822	if (fBusy)
823	{
824	cRefs = ASMAtomicIncU32(&pThis->cBusy);
825	Assert(cRefs > 0 && cRefs < UINT32_MAX / 2);
826	}
827
828	NOREF(cRefs);
829	}
830
831
832	/**
833	* Tries to retain the device as busy if the trunk is active.
834	*
835	* This is used before calling pfnRecv or pfnPreRecv.
836	*
837	* @returns true if we succeeded in retaining a busy reference to the active
838	* device. false if we failed.
839	* @param pThis The instance.
840	*/
841	DECLHIDDEN(bool) vboxNetFltTryRetainBusyActive(PVBOXNETFLTINS pThis)
842	{
843	uint32_t cRefs;
844	bool fRc;
845
846	/*
847	* Paranoid Android.
848	*/
849	AssertPtr(pThis);
850	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
851	Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
852	Assert( vboxNetFltGetState(pThis) > kVBoxNetFltInsState_Invalid
853	&& vboxNetFltGetState(pThis) < kVBoxNetFltInsState_Destroyed);
854	AssertPtr(pThis->pGlobals);
855	Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
856	Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
857	Assert(pThis->szName[0]);
858
859	/*
860	* Do the retaining and checking behind the spinlock.
861	*/
862	RTSpinlockAcquire(pThis->hSpinlock);
863	fRc = pThis->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE;
864	if (fRc)
865	{
866	cRefs = ASMAtomicIncU32(&pThis->cRefs);
867	AssertMsg(cRefs > 1 && cRefs < UINT32_MAX / 2, ("%d\n", cRefs)); NOREF(cRefs);
868
869	cRefs = ASMAtomicIncU32(&pThis->cBusy);
870	AssertMsg(cRefs >= 1 && cRefs < UINT32_MAX / 2, ("%d\n", cRefs)); NOREF(cRefs);
871	}
872	RTSpinlockRelease(pThis->hSpinlock);
873
874	return fRc;
875	}
876
877
878	/**
879	* Tries to retain the device as busy if the trunk is not disconnecting.
880	*
881	* This is used before reporting stuff to the internal network.
882	*
883	* @returns true if we succeeded in retaining a busy reference to the active
884	* device. false if we failed.
885	* @param pThis The instance.
886	*/
887	DECLHIDDEN(bool) vboxNetFltTryRetainBusyNotDisconnected(PVBOXNETFLTINS pThis)
888	{
889	uint32_t cRefs;
890	bool fRc;
891
892	/*
893	* Paranoid Android.
894	*/
895	AssertPtr(pThis);
896	Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
897	Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
898	Assert( vboxNetFltGetState(pThis) > kVBoxNetFltInsState_Invalid
899	&& vboxNetFltGetState(pThis) < kVBoxNetFltInsState_Destroyed);
900	AssertPtr(pThis->pGlobals);
901	Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
902	Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
903	Assert(pThis->szName[0]);
904
905	/*
906	* Do the retaining and checking behind the spinlock.
907	*/
908	RTSpinlockAcquire(pThis->hSpinlock);
909	fRc = pThis->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE
910	\|\| pThis->enmTrunkState == INTNETTRUNKIFSTATE_INACTIVE;
911	if (fRc)
912	{
913	cRefs = ASMAtomicIncU32(&pThis->cRefs);
914	AssertMsg(cRefs > 1 && cRefs < UINT32_MAX / 2, ("%d\n", cRefs)); NOREF(cRefs);
915
916	cRefs = ASMAtomicIncU32(&pThis->cBusy);
917	AssertMsg(cRefs >= 1 && cRefs < UINT32_MAX / 2, ("%d\n", cRefs)); NOREF(cRefs);
918	}
919	RTSpinlockRelease(pThis->hSpinlock);
920
921	return fRc;
922	}
923
924
925	/**
926	* @copydoc INTNETTRUNKIFPORT::pfnRetain
927	*/
928	static DECLCALLBACK(void) vboxNetFltPortRetain(PINTNETTRUNKIFPORT pIfPort)
929	{
930	PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
931	vboxNetFltRetain(pThis, false /* fBusy */);
932	}
933
934
935	/**
936	* Connects the instance to the specified switch port.
937	*
938	* Called while owning the lock. We're ASSUMING that the internal
939	* networking code is already owning an recursive mutex, so, there
940	* will be no deadlocks when vboxNetFltOsConnectIt calls back into
941	* it for setting preferences.
942	*
943	* @returns VBox status code.
944	* @param pThis The instance.
945	* @param pSwitchPort The port on the internal network 'switch'.
946	* @param ppIfPort Where to return our port interface.
947	*/
948	static int vboxNetFltConnectIt(PVBOXNETFLTINS pThis, PINTNETTRUNKSWPORT pSwitchPort, PINTNETTRUNKIFPORT *ppIfPort)
949	{
950	int rc;
951
952	/*
953	* Validate state.
954	*/
955	Assert(!pThis->fRediscoveryPending);
956	Assert(!pThis->cBusy);
957	#ifdef VBOXNETFLT_STATIC_CONFIG
958	Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Unconnected);
959	#else
960	Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Initializing);
961	#endif
962	Assert(pThis->enmTrunkState == INTNETTRUNKIFSTATE_INACTIVE);
963
964	/*
965	* Do the job.
966	* Note that we're calling the os stuff while owning the semaphore here.
967	*/
968	pThis->pSwitchPort = pSwitchPort;
969	rc = vboxNetFltOsConnectIt(pThis);
970	if (RT_SUCCESS(rc))
971	{
972	vboxNetFltSetState(pThis, kVBoxNetFltInsState_Connected);
973	*ppIfPort = &pThis->MyPort;
974	}
975	else
976	pThis->pSwitchPort = NULL;
977
978	Assert(pThis->enmTrunkState == INTNETTRUNKIFSTATE_INACTIVE);
979	return rc;
980	}
981
982
983	/**
984	* Creates a new instance.
985	*
986	* The new instance will be in the suspended state in a dynamic config and in
987	* the inactive in a static one.
988	*
989	* Called without owning the lock, but will request is several times.
990	*
991	* @returns VBox status code.
992	* @param pGlobals The globals.
993	* @param pszName The instance name.
994	* @param pSwitchPort The port on the switch that we're connected with (dynamic only).
995	* @param fNoPromisc Do not attempt going into promiscuous mode.
996	* @param pvContext Context argument for vboxNetFltOsInitInstance.
997	* @param ppIfPort Where to store the pointer to our port interface (dynamic only).
998	*/
999	static int vboxNetFltNewInstance(PVBOXNETFLTGLOBALS pGlobals, const char *pszName, PINTNETTRUNKSWPORT pSwitchPort,
1000	bool fNoPromisc, void pvContext, PINTNETTRUNKIFPORT ppIfPort)
1001	{
1002	/*
1003	* Allocate and initialize a new instance before requesting the mutex.
1004	* Note! That in a static config we'll initialize the trunk state to
1005	* disconnecting and flip it in vboxNetFltFactoryCreateAndConnect
1006	* later on. This better reflext the state and it works better with
1007	* assertions in the destruction path.
1008	*/
1009	int rc;
1010	size_t const cchName = strlen(pszName);
1011	PVBOXNETFLTINS pNew = (PVBOXNETFLTINS)RTMemAllocZVar(RT_UOFFSETOF_DYN(VBOXNETFLTINS, szName[cchName + 1]));
1012	if (!pNew)
1013	return VERR_INTNET_FLT_IF_FAILED;
1014	AssertMsg(((uintptr_t)pNew & 7) == 0, ("%p LB %#x\n", pNew, RT_UOFFSETOF_DYN(VBOXNETFLTINS, szName[cchName + 1])));
1015	pNew->pNext = NULL;
1016	pNew->MyPort.u32Version = INTNETTRUNKIFPORT_VERSION;
1017	pNew->MyPort.pfnRetain = vboxNetFltPortRetain;
1018	pNew->MyPort.pfnRelease = vboxNetFltPortRelease;
1019	pNew->MyPort.pfnDisconnectAndRelease= vboxNetFltPortDisconnectAndRelease;
1020	pNew->MyPort.pfnSetState = vboxNetFltPortSetState;
1021	pNew->MyPort.pfnWaitForIdle = vboxNetFltPortWaitForIdle;
1022	pNew->MyPort.pfnXmit = vboxNetFltPortXmit;
1023	pNew->MyPort.pfnNotifyMacAddress = vboxNetFltPortNotifyMacAddress;
1024	pNew->MyPort.pfnConnectInterface = vboxNetFltPortConnectInterface;
1025	pNew->MyPort.pfnDisconnectInterface = vboxNetFltPortDisconnectInterface;
1026	pNew->MyPort.u32VersionEnd = INTNETTRUNKIFPORT_VERSION;
1027	pNew->pSwitchPort = pSwitchPort;
1028	pNew->pGlobals = pGlobals;
1029	pNew->hSpinlock = NIL_RTSPINLOCK;
1030	pNew->enmState = kVBoxNetFltInsState_Initializing;
1031	#ifdef VBOXNETFLT_STATIC_CONFIG
1032	pNew->enmTrunkState = INTNETTRUNKIFSTATE_DISCONNECTING;
1033	#else
1034	pNew->enmTrunkState = INTNETTRUNKIFSTATE_INACTIVE;
1035	#endif
1036	pNew->fDisconnectedFromHost = false;
1037	pNew->fRediscoveryPending = false;
1038	pNew->fDisablePromiscuous = fNoPromisc;
1039	pNew->NanoTSLastRediscovery = INT64_MAX;
1040	pNew->cRefs = 1;
1041	pNew->cBusy = 0;
1042	pNew->hEventIdle = NIL_RTSEMEVENT;
1043	memcpy(pNew->szName, pszName, cchName + 1);
1044
1045	rc = RTSpinlockCreate(&pNew->hSpinlock, RTSPINLOCK_FLAGS_INTERRUPT_SAFE, "VBoxNetFltNewInstance");
1046	if (RT_SUCCESS(rc))
1047	{
1048	rc = RTSemEventCreate(&pNew->hEventIdle);
1049	if (RT_SUCCESS(rc))
1050	{
1051	rc = vboxNetFltOsPreInitInstance(pNew);
1052	if (RT_SUCCESS(rc))
1053	{
1054	/*
1055	* Insert the instance into the chain, checking for
1056	* duplicates first of course (race).
1057	*/
1058	rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
1059	if (RT_SUCCESS(rc))
1060	{
1061	if (!vboxNetFltFindInstanceLocked(pGlobals, pszName))
1062	{
1063	pNew->pNext = pGlobals->pInstanceHead;
1064	pGlobals->pInstanceHead = pNew;
1065	RTSemFastMutexRelease(pGlobals->hFastMtx);
1066
1067	/*
1068	* Call the OS specific initialization code.
1069	*/
1070	rc = vboxNetFltOsInitInstance(pNew, pvContext);
1071	RTSemFastMutexRequest(pGlobals->hFastMtx);
1072	if (RT_SUCCESS(rc))
1073	{
1074	#ifdef VBOXNETFLT_STATIC_CONFIG
1075	/*
1076	* Static instances are unconnected at birth.
1077	*/
1078	Assert(!pSwitchPort);
1079	pNew->enmState = kVBoxNetFltInsState_Unconnected;
1080	RTSemFastMutexRelease(pGlobals->hFastMtx);
1081	*ppIfPort = &pNew->MyPort;
1082	return rc;
1083
1084	#else /* !VBOXNETFLT_STATIC_CONFIG */
1085	/*
1086	* Connect it as well, the OS specific bits has to be done outside
1087	* the lock as they may call back to into intnet.
1088	*/
1089	rc = vboxNetFltConnectIt(pNew, pSwitchPort, ppIfPort);
1090	if (RT_SUCCESS(rc))
1091	{
1092	RTSemFastMutexRelease(pGlobals->hFastMtx);
1093	Assert(*ppIfPort == &pNew->MyPort);
1094	return rc;
1095	}
1096
1097	/* Bail out (failed). */
1098	vboxNetFltOsDeleteInstance(pNew);
1099	#endif /* !VBOXNETFLT_STATIC_CONFIG */
1100	}
1101	vboxNetFltUnlinkLocked(pGlobals, pNew);
1102	}
1103	else
1104	rc = VERR_INTNET_FLT_IF_BUSY;
1105	RTSemFastMutexRelease(pGlobals->hFastMtx);
1106	}
1107	}
1108	RTSemEventDestroy(pNew->hEventIdle);
1109	}
1110	RTSpinlockDestroy(pNew->hSpinlock);
1111	}
1112
1113	RTMemFree(pNew);
1114	return rc;
1115	}
1116
1117
1118	#ifdef VBOXNETFLT_STATIC_CONFIG
1119	/**
1120	* Searches for the NetFlt instance by its name and creates the new one if not found.
1121	*
1122	* @returns VBox status code.
1123	* @retval VINF_SUCCESS and *ppInstance if a new instance was created.
1124	* @retval VINF_ALREADY_INITIALIZED and *ppInstance if an instance already exists.
1125	*
1126	* @param pGlobal Pointer to the globals.
1127	* @param pszName The instance name.
1128	* @param ppInstance Where to return the instance pointer on success.
1129	* @param pvContext Context which needs to be passed along to vboxNetFltOsInitInstance.
1130	*/
1131	DECLHIDDEN(int) vboxNetFltSearchCreateInstance(PVBOXNETFLTGLOBALS pGlobals, const char pszName, PVBOXNETFLTINS ppInstance, void *pvContext)
1132	{
1133	PINTNETTRUNKIFPORT pIfPort;
1134	PVBOXNETFLTINS pCur;
1135	VBOXNETFTLINSSTATE enmState;
1136	int rc;
1137
1138	*ppInstance = NULL;
1139	rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
1140	AssertRCReturn(rc, rc);
1141
1142	/*
1143	* Look for an existing instance in the list.
1144	*
1145	* There might be an existing one in the list if the driver was unbound
1146	* while it was connected to an internal network. We're running into
1147	* a destruction race that is a bit similar to the one in
1148	* vboxNetFltFactoryCreateAndConnect, only the roles are reversed
1149	* and we're not in a position to back down. Instead of backing down
1150	* we'll delay a bit giving the other thread time to complete the
1151	* destructor.
1152	*/
1153	pCur = vboxNetFltFindInstanceLocked(pGlobals, pszName);
1154	while (pCur)
1155	{
1156	uint32_t cRefs = ASMAtomicIncU32(&pCur->cRefs);
1157	if (cRefs > 1)
1158	{
1159	enmState = vboxNetFltGetState(pCur);
1160	switch (enmState)
1161	{
1162	case kVBoxNetFltInsState_Unconnected:
1163	case kVBoxNetFltInsState_Connected:
1164	case kVBoxNetFltInsState_Disconnecting:
1165	if (pCur->fDisconnectedFromHost)
1166	{
1167	/* Wait for it to exit the transitional disconnecting
1168	state. It might otherwise be running the risk of
1169	upsetting the OS specific code... */
1170	/** @todo This reconnect stuff should be serialized correctly for static
1171	* devices. Shouldn't it? In the dynamic case we're using the INTNET
1172	* outbound thunk lock, but that doesn't quite cut it here, or does
1173	* it? We could either transition to initializing or make a callback
1174	* while owning the mutex here... */
1175	if (enmState == kVBoxNetFltInsState_Disconnecting)
1176	{
1177	do
1178	{
1179	RTSemFastMutexRelease(pGlobals->hFastMtx);
1180	RTThreadSleep(2); /* (2ms) */
1181	RTSemFastMutexRequest(pGlobals->hFastMtx);
1182	enmState = vboxNetFltGetState(pCur);
1183	}
1184	while (enmState == kVBoxNetFltInsState_Disconnecting);
1185	AssertMsg(enmState == kVBoxNetFltInsState_Unconnected, ("%d\n", enmState));
1186	Assert(pCur->fDisconnectedFromHost);
1187	}
1188
1189	RTSemFastMutexRelease(pGlobals->hFastMtx);
1190	*ppInstance = pCur;
1191	return VINF_ALREADY_INITIALIZED;
1192	}
1193	/* fall thru */
1194
1195	default:
1196	{
1197	bool fDfH = pCur->fDisconnectedFromHost;
1198	RTSemFastMutexRelease(pGlobals->hFastMtx);
1199	vboxNetFltRelease(pCur, false /* fBusy */);
1200	LogRel(("VBoxNetFlt: Huh? An instance of '%s' already exists! [pCur=%p cRefs=%d fDfH=%RTbool enmState=%d]\n",
1201	pszName, pCur, cRefs - 1, fDfH, enmState));
1202	*ppInstance = NULL;
1203	return VERR_INTNET_FLT_IF_BUSY;
1204	}
1205	}
1206	}
1207
1208	/* Zero references, it's being destroyed. Delay a bit so the destructor
1209	can finish its work and try again. (vboxNetFltNewInstance will fail
1210	with duplicate name if we don't.) */
1211	# ifdef RT_STRICT
1212	Assert(cRefs == 1);
1213	enmState = vboxNetFltGetState(pCur);
1214	AssertMsg( enmState == kVBoxNetFltInsState_Unconnected
1215	\|\| enmState == kVBoxNetFltInsState_Disconnecting
1216	\|\| enmState == kVBoxNetFltInsState_Destroyed, ("%d\n", enmState));
1217	# endif
1218	ASMAtomicDecU32(&pCur->cRefs);
1219	RTSemFastMutexRelease(pGlobals->hFastMtx);
1220	RTThreadSleep(2); /* (2ms) */
1221	rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
1222	AssertRCReturn(rc, rc);
1223
1224	/* try again */
1225	pCur = vboxNetFltFindInstanceLocked(pGlobals, pszName);
1226	}
1227
1228	RTSemFastMutexRelease(pGlobals->hFastMtx);
1229
1230	/*
1231	* Try create a new instance.
1232	* (fNoPromisc is overridden in the vboxNetFltFactoryCreateAndConnect path, so pass true here.)
1233	*/
1234	rc = vboxNetFltNewInstance(pGlobals, pszName, NULL, true /* fNoPromisc */, pvContext, &pIfPort);
1235	if (RT_SUCCESS(rc))
1236	*ppInstance = IFPORT_2_VBOXNETFLTINS(pIfPort);
1237	else
1238	*ppInstance = NULL;
1239
1240	return rc;
1241	}
1242	#endif /* VBOXNETFLT_STATIC_CONFIG */
1243
1244
1245	/**
1246	* @copydoc INTNETTRUNKFACTORY::pfnCreateAndConnect
1247	*/
1248	static DECLCALLBACK(int) vboxNetFltFactoryCreateAndConnect(PINTNETTRUNKFACTORY pIfFactory, const char *pszName,
1249	PINTNETTRUNKSWPORT pSwitchPort, uint32_t fFlags,
1250	PINTNETTRUNKIFPORT *ppIfPort)
1251	{
1252	PVBOXNETFLTGLOBALS pGlobals = (PVBOXNETFLTGLOBALS)((uint8_t *)pIfFactory - RT_UOFFSETOF(VBOXNETFLTGLOBALS, TrunkFactory));
1253	PVBOXNETFLTINS pCur;
1254	int rc;
1255
1256	LogFlow(("vboxNetFltFactoryCreateAndConnect: pszName=%p:{%s} fFlags=%#x\n", pszName, pszName, fFlags));
1257	Assert(pGlobals->cFactoryRefs > 0);
1258	AssertMsgReturn(!(fFlags & ~(INTNETTRUNKFACTORY_FLAG_NO_PROMISC)),
1259	("%#x\n", fFlags), VERR_INVALID_PARAMETER);
1260
1261	/*
1262	* Static: Find instance, check if busy, connect if not.
1263	* Dynamic: Check for duplicate / busy interface instance.
1264	*/
1265	rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
1266	AssertRCReturn(rc, rc);
1267
1268	//#if defined(VBOXNETADP) && defined(RT_OS_WINDOWS)
1269	// /* temporary hack to pick up the first adapter */
1270	// pCur = pGlobals->pInstanceHead; /** @todo Don't for get to remove this temporary hack... :-) */
1271	//#else
1272	pCur = vboxNetFltFindInstanceLocked(pGlobals, pszName);
1273	//#endif
1274	if (pCur)
1275	{
1276	#ifdef VBOXNETFLT_STATIC_CONFIG
1277	/* Try grab a reference. If the count had already reached zero we're racing the
1278	destructor code and must back down. */
1279	uint32_t cRefs = ASMAtomicIncU32(&pCur->cRefs);
1280	if (cRefs > 1)
1281	{
1282	if (vboxNetFltGetState(pCur) == kVBoxNetFltInsState_Unconnected)
1283	{
1284	pCur->enmTrunkState = INTNETTRUNKIFSTATE_INACTIVE; /** @todo protect me? */
1285	pCur->fDisablePromiscuous = !!(fFlags & INTNETTRUNKFACTORY_FLAG_NO_PROMISC);
1286	rc = vboxNetFltConnectIt(pCur, pSwitchPort, ppIfPort);
1287	if (RT_SUCCESS(rc))
1288	pCur = NULL; /* Don't release it, reference given to the caller. */
1289	else
1290	pCur->enmTrunkState = INTNETTRUNKIFSTATE_DISCONNECTING;
1291	}
1292	else
1293	rc = VERR_INTNET_FLT_IF_BUSY;
1294	}
1295	else
1296	{
1297	Assert(cRefs == 1);
1298	ASMAtomicDecU32(&pCur->cRefs);
1299	pCur = NULL; /* nothing to release */
1300	rc = VERR_INTNET_FLT_IF_NOT_FOUND;
1301	}
1302
1303	RTSemFastMutexRelease(pGlobals->hFastMtx);
1304	if (pCur)
1305	vboxNetFltRelease(pCur, false /* fBusy */);
1306	#else
1307	rc = VERR_INTNET_FLT_IF_BUSY;
1308	RTSemFastMutexRelease(pGlobals->hFastMtx);
1309	#endif
1310	LogFlow(("vboxNetFltFactoryCreateAndConnect: returns %Rrc\n", rc));
1311	return rc;
1312	}
1313
1314	RTSemFastMutexRelease(pGlobals->hFastMtx);
1315
1316	#ifdef VBOXNETFLT_STATIC_CONFIG
1317	rc = VERR_INTNET_FLT_IF_NOT_FOUND;
1318	#else
1319	/*
1320	* Dynamically create a new instance.
1321	*/
1322	rc = vboxNetFltNewInstance(pGlobals,
1323	pszName,
1324	pSwitchPort,
1325	!!(fFlags & INTNETTRUNKFACTORY_FLAG_NO_PROMISC),
1326	NULL,
1327	ppIfPort);
1328	#endif
1329	LogFlow(("vboxNetFltFactoryCreateAndConnect: returns %Rrc\n", rc));
1330	return rc;
1331	}
1332
1333
1334	/**
1335	* @copydoc INTNETTRUNKFACTORY::pfnRelease
1336	*/
1337	static DECLCALLBACK(void) vboxNetFltFactoryRelease(PINTNETTRUNKFACTORY pIfFactory)
1338	{
1339	PVBOXNETFLTGLOBALS pGlobals = (PVBOXNETFLTGLOBALS)((uint8_t *)pIfFactory - RT_UOFFSETOF(VBOXNETFLTGLOBALS, TrunkFactory));
1340
1341	int32_t cRefs = ASMAtomicDecS32(&pGlobals->cFactoryRefs);
1342	Assert(cRefs >= 0); NOREF(cRefs);
1343	LogFlow(("vboxNetFltFactoryRelease: cRefs=%d (new)\n", cRefs));
1344	}
1345
1346
1347	/**
1348	* Implements the SUPDRV component factor interface query method.
1349	*
1350	* @returns Pointer to an interface. NULL if not supported.
1351	*
1352	* @param pSupDrvFactory Pointer to the component factory registration structure.
1353	* @param pSession The session - unused.
1354	* @param pszInterfaceUuid The factory interface id.
1355	*/
1356	static DECLCALLBACK(void *) vboxNetFltQueryFactoryInterface(PCSUPDRVFACTORY pSupDrvFactory, PSUPDRVSESSION pSession,
1357	const char *pszInterfaceUuid)
1358	{
1359	PVBOXNETFLTGLOBALS pGlobals = (PVBOXNETFLTGLOBALS)((uint8_t *)pSupDrvFactory - RT_UOFFSETOF(VBOXNETFLTGLOBALS, SupDrvFactory));
1360
1361	/*
1362	* Convert the UUID strings and compare them.
1363	*/
1364	RTUUID UuidReq;
1365	int rc = RTUuidFromStr(&UuidReq, pszInterfaceUuid);
1366	if (RT_SUCCESS(rc))
1367	{
1368	if (!RTUuidCompareStr(&UuidReq, INTNETTRUNKFACTORY_UUID_STR))
1369	{
1370	ASMAtomicIncS32(&pGlobals->cFactoryRefs);
1371	return &pGlobals->TrunkFactory;
1372	}
1373	#ifdef LOG_ENABLED
1374	/* log legacy queries */
1375	/* else if (!RTUuidCompareStr(&UuidReq, INTNETTRUNKFACTORY_V1_UUID_STR))
1376	Log(("VBoxNetFlt: V1 factory query\n"));
1377	*/
1378	else
1379	Log(("VBoxNetFlt: unknown factory interface query (%s)\n", pszInterfaceUuid));
1380	#endif
1381	}
1382	else
1383	Log(("VBoxNetFlt: rc=%Rrc, uuid=%s\n", rc, pszInterfaceUuid));
1384
1385	RT_NOREF1(pSession);
1386	return NULL;
1387	}
1388
1389
1390	/**
1391	* Checks whether the VBoxNetFlt wossname can be unloaded.
1392	*
1393	* This will return false if someone is currently using the module.
1394	*
1395	* @returns true if it's relatively safe to unload it, otherwise false.
1396	* @param pGlobals Pointer to the globals.
1397	*/
1398	DECLHIDDEN(bool) vboxNetFltCanUnload(PVBOXNETFLTGLOBALS pGlobals)
1399	{
1400	int rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
1401	bool fRc = !pGlobals->pInstanceHead
1402	&& pGlobals->cFactoryRefs <= 0;
1403	RTSemFastMutexRelease(pGlobals->hFastMtx);
1404	AssertRC(rc);
1405	return fRc;
1406	}
1407
1408
1409	/**
1410	* Try to close the IDC connection to SUPDRV if established.
1411	*
1412	* @returns VBox status code.
1413	* @retval VINF_SUCCESS on success.
1414	* @retval VERR_WRONG_ORDER if we're busy.
1415	*
1416	* @param pGlobals Pointer to the globals.
1417	*
1418	* @sa vboxNetFltTryDeleteIdcAndGlobals()
1419	*/
1420	DECLHIDDEN(int) vboxNetFltTryDeleteIdc(PVBOXNETFLTGLOBALS pGlobals)
1421	{
1422	int rc;
1423
1424	Assert(pGlobals->hFastMtx != NIL_RTSEMFASTMUTEX);
1425
1426	/*
1427	* Check before trying to deregister the factory.
1428	*/
1429	if (!vboxNetFltCanUnload(pGlobals))
1430	return VERR_WRONG_ORDER;
1431
1432	if (!pGlobals->fIDCOpen)
1433	rc = VINF_SUCCESS;
1434	else
1435	{
1436	/*
1437	* Disconnect from SUPDRV and check that nobody raced us,
1438	* reconnect if that should happen.
1439	*/
1440	rc = SUPR0IdcComponentDeregisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
1441	AssertRC(rc);
1442	if (!vboxNetFltCanUnload(pGlobals))
1443	{
1444	rc = SUPR0IdcComponentRegisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
1445	AssertRC(rc);
1446	return VERR_WRONG_ORDER;
1447	}
1448
1449	SUPR0IdcClose(&pGlobals->SupDrvIDC);
1450	pGlobals->fIDCOpen = false;
1451	}
1452
1453	return rc;
1454	}
1455
1456
1457	/**
1458	* Establishes the IDC connection to SUPDRV and registers our component factory.
1459	*
1460	* @returns VBox status code.
1461	* @param pGlobals Pointer to the globals.
1462	* @sa vboxNetFltInitGlobalsAndIdc().
1463	*/
1464	DECLHIDDEN(int) vboxNetFltInitIdc(PVBOXNETFLTGLOBALS pGlobals)
1465	{
1466	int rc;
1467	Assert(!pGlobals->fIDCOpen);
1468
1469	/*
1470	* Establish a connection to SUPDRV and register our component factory.
1471	*/
1472	rc = SUPR0IdcOpen(&pGlobals->SupDrvIDC, 0 /* iReqVersion = default /, 0 / iMinVersion = default */, NULL, NULL, NULL);
1473	if (RT_SUCCESS(rc))
1474	{
1475	rc = SUPR0IdcComponentRegisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
1476	if (RT_SUCCESS(rc))
1477	{
1478	pGlobals->fIDCOpen = true;
1479	Log(("VBoxNetFlt: pSession=%p\n", SUPR0IdcGetSession(&pGlobals->SupDrvIDC)));
1480	return rc;
1481	}
1482
1483	/* bail out. */
1484	LogRel(("VBoxNetFlt: Failed to register component factory, rc=%Rrc\n", rc));
1485	SUPR0IdcClose(&pGlobals->SupDrvIDC);
1486	}
1487
1488	return rc;
1489	}
1490
1491
1492	/**
1493	* Deletes the globals.
1494	*
1495	* This must be called after the IDC connection has been closed,
1496	* see vboxNetFltTryDeleteIdc().
1497	*
1498	* @param pGlobals Pointer to the globals.
1499	* @sa vboxNetFltTryDeleteIdcAndGlobals()
1500	*/
1501	DECLHIDDEN(void) vboxNetFltDeleteGlobals(PVBOXNETFLTGLOBALS pGlobals)
1502	{
1503	Assert(!pGlobals->fIDCOpen);
1504
1505	/*
1506	* Release resources.
1507	*/
1508	RTSemFastMutexDestroy(pGlobals->hFastMtx);
1509	pGlobals->hFastMtx = NIL_RTSEMFASTMUTEX;
1510	}
1511
1512
1513	/**
1514	* Initializes the globals.
1515	*
1516	* @returns VBox status code.
1517	* @param pGlobals Pointer to the globals.
1518	* @sa vboxNetFltInitGlobalsAndIdc().
1519	*/
1520	DECLHIDDEN(int) vboxNetFltInitGlobals(PVBOXNETFLTGLOBALS pGlobals)
1521	{
1522	/*
1523	* Initialize the common portions of the structure.
1524	*/
1525	int rc = RTSemFastMutexCreate(&pGlobals->hFastMtx);
1526	if (RT_SUCCESS(rc))
1527	{
1528	pGlobals->pInstanceHead = NULL;
1529
1530	pGlobals->TrunkFactory.pfnRelease = vboxNetFltFactoryRelease;
1531	pGlobals->TrunkFactory.pfnCreateAndConnect = vboxNetFltFactoryCreateAndConnect;
1532	#if defined(RT_OS_WINDOWS) && defined(VBOXNETADP)
1533	memcpy(pGlobals->SupDrvFactory.szName, "VBoxNetAdp", sizeof("VBoxNetAdp"));
1534	#else
1535	memcpy(pGlobals->SupDrvFactory.szName, "VBoxNetFlt", sizeof("VBoxNetFlt"));
1536	#endif
1537	pGlobals->SupDrvFactory.pfnQueryFactoryInterface = vboxNetFltQueryFactoryInterface;
1538	pGlobals->fIDCOpen = false;
1539
1540	return rc;
1541	}
1542
1543	return rc;
1544	}
1545
1546
1547	/**
1548	* Called by the native part when the OS wants the driver to unload.
1549	*
1550	* @returns VINF_SUCCESS on success, VERR_WRONG_ORDER if we're busy.
1551	*
1552	* @param pGlobals Pointer to the globals.
1553	*/
1554	DECLHIDDEN(int) vboxNetFltTryDeleteIdcAndGlobals(PVBOXNETFLTGLOBALS pGlobals)
1555	{
1556	int rc = vboxNetFltTryDeleteIdc(pGlobals);
1557	if (RT_SUCCESS(rc))
1558	vboxNetFltDeleteGlobals(pGlobals);
1559	return rc;
1560	}
1561
1562
1563	/**
1564	* Called by the native driver/kext module initialization routine.
1565	*
1566	* It will initialize the common parts of the globals, assuming the caller
1567	* has already taken care of the OS specific bits, and establish the IDC
1568	* connection to SUPDRV.
1569	*
1570	* @returns VBox status code.
1571	* @param pGlobals Pointer to the globals.
1572	*/
1573	DECLHIDDEN(int) vboxNetFltInitGlobalsAndIdc(PVBOXNETFLTGLOBALS pGlobals)
1574	{
1575	/*
1576	* Initialize the common portions of the structure.
1577	*/
1578	int rc = vboxNetFltInitGlobals(pGlobals);
1579	if (RT_SUCCESS(rc))
1580	{
1581	rc = vboxNetFltInitIdc(pGlobals);
1582	if (RT_SUCCESS(rc))
1583	return rc;
1584
1585	/* bail out. */
1586	vboxNetFltDeleteGlobals(pGlobals);
1587	}
1588
1589	return rc;
1590	}
1591

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source: vbox/trunk/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.c@ 96586

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