VBoxNetFlt-darwin.cpp@ 52618

Last change on this file since 52618 was 52618, checked in by vboxsync, 10 years ago
HostDrivers, Runtime, Devices, Additions: TSC delta measurement and other changes resulting from bumping supdrv major version. TSC delta measurement currently disabled.
Property svn:eol-style set to `native` Property svn:keywords set to `Id Revision`
File size: 45.7 KB

Line
1	/* $Id: VBoxNetFlt-darwin.cpp 52618 2014-09-05 12:07:29Z vboxsync $ */
2	/** @file
3	* VBoxNetFlt - Network Filter Driver (Host), Darwin Specific Code.
4	*/
5
6	/*
7	* Copyright (C) 2006-2014 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*******************************************************************************
19	* Header Files *
20	*******************************************************************************/
21	/*
22	* Deal with conflicts first.
23	* PVM - BSD mess, that FreeBSD has correct a long time ago.
24	* iprt/types.h before sys/param.h - prevents UINT32_C and friends.
25	*/
26	#include <iprt/types.h>
27	#include <sys/param.h>
28	#undef PVM
29
30	#include <IOKit/IOLib.h> /* Assert as function */
31
32	#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
33	#include <VBox/log.h>
34	#include <VBox/err.h>
35	#include <VBox/intnetinline.h>
36	#include <VBox/version.h>
37	#include <iprt/initterm.h>
38	#include <iprt/assert.h>
39	#include <iprt/spinlock.h>
40	#include <iprt/semaphore.h>
41	#include <iprt/process.h>
42	#include <iprt/alloc.h>
43	#include <iprt/alloca.h>
44	#include <iprt/time.h>
45	#include <iprt/net.h>
46	#include <iprt/thread.h>
47
48	#include "../../darwin/VBoxNetSend.h"
49
50	#include <mach/kmod.h>
51	#include <sys/conf.h>
52	#include <sys/errno.h>
53	#include <sys/ioccom.h>
54	#include <sys/malloc.h>
55	#include <sys/proc.h>
56	#include <sys/socket.h>
57	#include <sys/sockio.h>
58	#include <sys/kern_event.h>
59	#include <net/kpi_interface.h>
60	RT_C_DECLS_BEGIN /* Buggy 10.4 headers, fixed in 10.5. */
61	#include <sys/kpi_mbuf.h>
62	#include <net/kpi_interfacefilter.h>
63	RT_C_DECLS_END
64	#include <net/if.h>
65
66	#define VBOXNETFLT_OS_SPECFIC 1
67	#include "../VBoxNetFltInternal.h"
68
69
70	/*******************************************************************************
71	* Defined Constants And Macros *
72	*******************************************************************************/
73	/** The maximum number of SG segments.
74	* Used to prevent stack overflow and similar bad stuff. */
75	#define VBOXNETFLT_DARWIN_MAX_SEGS 32
76
77	#if 0
78	/** For testing extremely segmented frames. */
79	#define VBOXNETFLT_DARWIN_TEST_SEG_SIZE 14
80	#endif
81
82
83	/*******************************************************************************
84	* Internal Functions *
85	*******************************************************************************/
86	RT_C_DECLS_BEGIN
87	static kern_return_t VBoxNetFltDarwinStart(struct kmod_info pKModInfo, void pvData);
88	static kern_return_t VBoxNetFltDarwinStop(struct kmod_info pKModInfo, void pvData);
89	RT_C_DECLS_END
90
91
92	/*******************************************************************************
93	* Structures and Typedefs *
94	*******************************************************************************/
95	/**
96	* The mbuf tag data.
97	*
98	* We have to associate the ethernet header with each packet we're sending
99	* because things like icmp will inherit the tag it self so the tag along
100	* isn't sufficient to identify our mbufs. For the icmp scenario the ethernet
101	* header naturally changes before the packet is send pack, so let check it.
102	*/
103	typedef struct VBOXNETFLTTAG
104	{
105	/** The ethernet header of the outgoing frame. */
106	RTNETETHERHDR EthHdr;
107	} VBOXNETFLTTAG;
108	/** Pointer to a VBoxNetFlt mbuf tag. */
109	typedef VBOXNETFLTTAG *PVBOXNETFLTTAG;
110	/** Pointer to a const VBoxNetFlt mbuf tag. */
111	typedef VBOXNETFLTTAG const *PCVBOXNETFLTTAG;
112
113
114	/*******************************************************************************
115	* Global Variables *
116	*******************************************************************************/
117	/**
118	* Declare the module stuff.
119	*/
120	RT_C_DECLS_BEGIN
121	extern kern_return_t _start(struct kmod_info pKModInfo, void pvData);
122	extern kern_return_t _stop(struct kmod_info pKModInfo, void pvData);
123
124	KMOD_EXPLICIT_DECL(VBoxNetFlt, VBOX_VERSION_STRING, _start, _stop)
125	DECLHIDDEN(kmod_start_func_t *) _realmain = VBoxNetFltDarwinStart;
126	DECLHIDDEN(kmod_stop_func_t *) _antimain = VBoxNetFltDarwinStop;
127	DECLHIDDEN(int) _kext_apple_cc = __APPLE_CC__;
128	RT_C_DECLS_END
129
130
131	/**
132	* The (common) global data.
133	*/
134	static VBOXNETFLTGLOBALS g_VBoxNetFltGlobals;
135
136	/** The unique tag id for this module.
137	* This is basically a unique string hash that lives on until reboot.
138	* It is used for tagging mbufs. */
139	static mbuf_tag_id_t g_idTag;
140
141	/** The offset of the struct ifnet::if_pcount variable.
142	* @remarks Initial value is valid for Lion and earlier. We adjust it on attach
143	* for later releases. */
144	static unsigned g_offIfNetPCount = sizeof(void ) (1 /if_softc/ + 1 /if_name/ + 2 /if_link/ + 2 /if_addrhead/ + 1 /if_check_multi/)
145	+ sizeof(u_long) /if_refcnt/;
146	/** Macro for accessing ifnet::if_pcount. */
147	#define VBOX_GET_PCOUNT(pIfNet) ( (int )((uintptr_t)pIfNet + g_offIfNetPCount) )
148	/** The size of area of ifnet structure we try to locate if_pcount in. */
149	#define VBOXNETFLT_DARWIN_IFNET_SIZE 256
150	/** Indicates whether g_offIfNetPCount has been adjusted already (no point in
151	* doing it more than once). */
152	static bool g_fNetPCountFound = false;
153
154
155	/**
156	* Change the promiscuous setting and try spot the changed in @a pIfNet.
157	*
158	* @returns Offset of potential p_count field.
159	* @param pIfNet The interface we're attaching to.
160	* @param iPromisc Whether to enable (1) or disable (0) promiscuous mode.
161	*
162	* @note This implementation relies on if_pcount to be aligned on sizeof(int).
163	*/
164	static unsigned vboxNetFltDarwinSetAndDiff(ifnet_t pIfNet, int iPromisc)
165	{
166	int aiSavedState[VBOXNETFLT_DARWIN_IFNET_SIZE / sizeof(int)];
167	memcpy(aiSavedState, pIfNet, sizeof(aiSavedState));
168
169	ifnet_set_promiscuous(pIfNet, iPromisc);
170
171	int const iDiff = iPromisc ? 1 : -1;
172
173	/*
174	* We assume that ifnet structure will never have less members in front of if_pcount
175	* than it used to have in Lion. If this turns out to be false assumption we will
176	* have to start from zero offset.
177	*/
178	for (unsigned i = g_offIfNetPCount / sizeof(int); i < RT_ELEMENTS(aiSavedState); i++)
179	if (((int*)pIfNet)[i] - aiSavedState[i] == iDiff)
180	return i * sizeof(int);
181
182	return 0;
183	}
184
185
186	/**
187	* Detect and adjust the offset of ifnet::if_pcount.
188	*
189	* @param pIfNet The interface we're attaching to.
190	*/
191	static void vboxNetFltDarwinDetectPCountOffset(ifnet_t pIfNet)
192	{
193	if (g_fNetPCountFound)
194	return;
195
196	/*
197	* It would be nice to use locking at this point, but it is not available via KPI.
198	* This is why we try several times. At each attempt we modify if_pcount four times
199	* to rule out false detections.
200	*/
201	unsigned offTry1, offTry2, offTry3, offTry4;
202	for (int iAttempt = 0; iAttempt < 3; iAttempt++)
203	{
204	offTry1 = vboxNetFltDarwinSetAndDiff(pIfNet, 1);
205	offTry2 = vboxNetFltDarwinSetAndDiff(pIfNet, 1);
206	offTry3 = vboxNetFltDarwinSetAndDiff(pIfNet, 0);
207	offTry4 = vboxNetFltDarwinSetAndDiff(pIfNet, 0);
208	if (offTry1 == offTry2 && offTry2 == offTry3 && offTry3 == offTry4)
209	{
210	if (g_offIfNetPCount != offTry1)
211	{
212	Log(("VBoxNetFltDarwinDetectPCountOffset: Adjusted if_pcount offset to %x from %x.\n", offTry1, g_offIfNetPCount));
213	g_offIfNetPCount = offTry1;
214	g_fNetPCountFound = true;
215	}
216	break;
217	}
218	}
219
220	if (g_offIfNetPCount != offTry1)
221	LogRel(("VBoxNetFlt: Failed to detect promiscuous count, all traffic may reach wire (%x != %x).\n", g_offIfNetPCount, offTry1));
222	}
223
224
225	/**
226	* Start the kernel module.
227	*/
228	static kern_return_t VBoxNetFltDarwinStart(struct kmod_info pKModInfo, void pvData)
229	{
230	int rc;
231
232	/*
233	* Initialize IPRT and find our module tag id.
234	* (IPRT is shared with VBoxDrv, it creates the loggers.)
235	*/
236	rc = RTR0Init(0);
237	if (RT_SUCCESS(rc))
238	{
239	Log(("VBoxNetFltDarwinStart\n"));
240	errno_t err = mbuf_tag_id_find("org.VirtualBox.kext.VBoxFltDrv", &g_idTag);
241	if (!err)
242	{
243	/*
244	* Initialize the globals and connect to the support driver.
245	*
246	* This will call back vboxNetFltOsOpenSupDrv (and maybe vboxNetFltOsCloseSupDrv)
247	* for establishing the connect to the support driver.
248	*/
249	memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
250	rc = vboxNetFltInitGlobalsAndIdc(&g_VBoxNetFltGlobals);
251	if (RT_SUCCESS(rc))
252	{
253	LogRel(("VBoxFltDrv: version " VBOX_VERSION_STRING " r%d\n", VBOX_SVN_REV));
254	return KMOD_RETURN_SUCCESS;
255	}
256
257	LogRel(("VBoxFltDrv: failed to initialize device extension (rc=%d)\n", rc));
258	}
259	else
260	LogRel(("VBoxFltDrv: mbuf_tag_id_find failed, err=%d\n", err));
261	RTR0Term();
262	}
263	else
264	printf("VBoxFltDrv: failed to initialize IPRT (rc=%d)\n", rc);
265
266	memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
267	return KMOD_RETURN_FAILURE;
268	}
269
270
271	/**
272	* Stop the kernel module.
273	*/
274	static kern_return_t VBoxNetFltDarwinStop(struct kmod_info pKModInfo, void pvData)
275	{
276	Log(("VBoxNetFltDarwinStop\n"));
277
278	/*
279	* Refuse to unload if anyone is currently using the filter driver.
280	* This is important as I/O kit / xnu will to be able to do usage
281	* tracking for us!
282	*/
283	int rc = vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltGlobals);
284	if (RT_FAILURE(rc))
285	{
286	Log(("VBoxNetFltDarwinStop - failed, busy.\n"));
287	return KMOD_RETURN_FAILURE;
288	}
289
290	/*
291	* Undo the work done during start (in reverse order).
292	*/
293	memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
294
295	RTR0Term();
296
297	return KMOD_RETURN_SUCCESS;
298	}
299
300
301	/**
302	* Reads and retains the host interface handle.
303	*
304	* @returns The handle, NULL if detached.
305	* @param pThis
306	*/
307	DECLINLINE(ifnet_t) vboxNetFltDarwinRetainIfNet(PVBOXNETFLTINS pThis)
308	{
309	ifnet_t pIfNet = NULL;
310
311	/*
312	* Be careful here to avoid problems racing the detached callback.
313	*/
314	RTSpinlockAcquire(pThis->hSpinlock);
315	if (!ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost))
316	{
317	pIfNet = ASMAtomicUoReadPtrT(&pThis->u.s.pIfNet, ifnet_t);
318	if (pIfNet)
319	ifnet_reference(pIfNet);
320	}
321	RTSpinlockRelease(pThis->hSpinlock);
322
323	return pIfNet;
324	}
325
326
327	/**
328	* Release the host interface handle previously retained
329	* by vboxNetFltDarwinRetainIfNet.
330	*
331	* @param pThis The instance.
332	* @param pIfNet The vboxNetFltDarwinRetainIfNet return value, NULL is fine.
333	*/
334	DECLINLINE(void) vboxNetFltDarwinReleaseIfNet(PVBOXNETFLTINS pThis, ifnet_t pIfNet)
335	{
336	NOREF(pThis);
337	if (pIfNet)
338	ifnet_release(pIfNet);
339	}
340
341
342	/**
343	* Checks whether this is an mbuf created by vboxNetFltDarwinMBufFromSG,
344	* i.e. a buffer which we're pushing and should be ignored by the filter callbacks.
345	*
346	* @returns true / false accordingly.
347	* @param pThis The instance.
348	* @param pMBuf The mbuf.
349	* @param pvFrame The frame pointer, optional.
350	*/
351	DECLINLINE(bool) vboxNetFltDarwinMBufIsOur(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame)
352	{
353	NOREF(pThis);
354
355	/*
356	* Lookup the tag set by vboxNetFltDarwinMBufFromSG.
357	*/
358	PCVBOXNETFLTTAG pTagData;
359	size_t cbTagData;
360	errno_t err = mbuf_tag_find(pMBuf, g_idTag, 0 /* type /, &cbTagData, (void *)&pTagData);
361	if (err)
362	return false;
363	AssertReturn(cbTagData == sizeof(*pTagData), false);
364
365	/*
366	* Dig out the ethernet header from the mbuf.
367	*/
368	PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pvFrame;
369	if (!pEthHdr)
370	pEthHdr = (PCRTNETETHERHDR)mbuf_pkthdr_header(pMBuf);
371	if (!pEthHdr)
372	pEthHdr = (PCRTNETETHERHDR)mbuf_data(pMBuf);
373	/* ASSUMING that there is enough data to work on! */
374	if ( pEthHdr->DstMac.au8[0] != pTagData->EthHdr.DstMac.au8[0]
375	\|\| pEthHdr->DstMac.au8[1] != pTagData->EthHdr.DstMac.au8[1]
376	\|\| pEthHdr->DstMac.au8[2] != pTagData->EthHdr.DstMac.au8[2]
377	\|\| pEthHdr->DstMac.au8[3] != pTagData->EthHdr.DstMac.au8[3]
378	\|\| pEthHdr->DstMac.au8[4] != pTagData->EthHdr.DstMac.au8[4]
379	\|\| pEthHdr->DstMac.au8[5] != pTagData->EthHdr.DstMac.au8[5]
380	\|\| pEthHdr->SrcMac.au8[0] != pTagData->EthHdr.SrcMac.au8[0]
381	\|\| pEthHdr->SrcMac.au8[1] != pTagData->EthHdr.SrcMac.au8[1]
382	\|\| pEthHdr->SrcMac.au8[2] != pTagData->EthHdr.SrcMac.au8[2]
383	\|\| pEthHdr->SrcMac.au8[3] != pTagData->EthHdr.SrcMac.au8[3]
384	\|\| pEthHdr->SrcMac.au8[4] != pTagData->EthHdr.SrcMac.au8[4]
385	\|\| pEthHdr->SrcMac.au8[5] != pTagData->EthHdr.SrcMac.au8[5]
386	\|\| pEthHdr->EtherType != pTagData->EthHdr.EtherType)
387	{
388	Log3(("tagged, but the ethernet header has changed\n"));
389	return false;
390	}
391
392	return true;
393	}
394
395
396	/**
397	* Internal worker that create a darwin mbuf for a (scatter/)gather list.
398	*
399	* @returns Pointer to the mbuf.
400	* @param pThis The instance.
401	* @param pSG The (scatter/)gather list.
402	*/
403	static mbuf_t vboxNetFltDarwinMBufFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG)
404	{
405	/// @todo future? mbuf_how_t How = preemption enabled ? MBUF_DONTWAIT : MBUF_WAITOK;
406	mbuf_how_t How = MBUF_WAITOK;
407
408	/*
409	* We need some way of getting back to our instance data when
410	* the mbuf is freed, so use pvUserData for this.
411	* -- this is not relevant anylonger! --
412	*/
413	Assert(!pSG->pvUserData \|\| pSG->pvUserData == pThis);
414	Assert(!pSG->pvUserData2);
415	pSG->pvUserData = pThis;
416
417	/*
418	* Allocate a packet and copy over the data.
419	*
420	* Using mbuf_attachcluster() here would've been nice but there are two
421	* issues with it: (1) it's 10.5.x only, and (2) the documentation indicates
422	* that it's not supposed to be used for really external buffers. The 2nd
423	* point might be argued against considering that the only m_clattach user
424	* is mallocs memory for the ext mbuf and not doing what's stated in the docs.
425	* However, it's hard to tell if these m_clattach buffers actually makes it
426	* to the NICs or not, and even if they did, the NIC would need the physical
427	* addresses for the pages they contain and might end up copying the data
428	* to a new mbuf anyway.
429	*
430	* So, in the end it's better to just do it the simple way that will work
431	* 100%, even if it involves some extra work (alloc + copy) we really wished
432	* to avoid.
433	*
434	* Note. We can't make use of the physical addresses on darwin because the
435	* way the mbuf / cluster stuff works (see mbuf_data_to_physical and
436	* mcl_to_paddr).
437	*/
438	mbuf_t pPkt = NULL;
439	errno_t err = mbuf_allocpacket(How, pSG->cbTotal, NULL, &pPkt);
440	if (!err)
441	{
442	/* Skip zero sized memory buffers (paranoia). */
443	mbuf_t pCur = pPkt;
444	while (pCur && !mbuf_maxlen(pCur))
445	pCur = mbuf_next(pCur);
446	Assert(pCur);
447
448	/* Set the required packet header attributes. */
449	mbuf_pkthdr_setlen(pPkt, pSG->cbTotal);
450	mbuf_pkthdr_setheader(pPkt, mbuf_data(pCur));
451
452	/* Special case the single buffer copy. */
453	if ( mbuf_next(pCur)
454	&& mbuf_maxlen(pCur) >= pSG->cbTotal)
455	{
456	mbuf_setlen(pCur, pSG->cbTotal);
457	IntNetSgRead(pSG, mbuf_data(pCur));
458	}
459	else
460	{
461	/* Multi buffer copying. */
462	size_t cbLeft = pSG->cbTotal;
463	size_t offSrc = 0;
464	while (cbLeft > 0 && pCur)
465	{
466	size_t cb = mbuf_maxlen(pCur);
467	if (cb > cbLeft)
468	cb = cbLeft;
469	mbuf_setlen(pCur, cb);
470	IntNetSgReadEx(pSG, offSrc, cb, mbuf_data(pCur));
471
472	/* advance */
473	offSrc += cb;
474	cbLeft -= cb;
475	pCur = mbuf_next(pCur);
476	}
477	Assert(cbLeft == 0);
478	}
479	if (!err)
480	{
481	/*
482	* Tag the packet and return successfully.
483	*/
484	PVBOXNETFLTTAG pTagData;
485	err = mbuf_tag_allocate(pPkt, g_idTag, 0 /* type /, sizeof(VBOXNETFLTTAG) / tag len /, How, (void *)&pTagData);
486	if (!err)
487	{
488	Assert(pSG->aSegs[0].cb >= sizeof(pTagData->EthHdr));
489	memcpy(&pTagData->EthHdr, pSG->aSegs[0].pv, sizeof(pTagData->EthHdr));
490	return pPkt;
491	}
492
493	/* bailout: */
494	AssertMsg(err == ENOMEM \|\| err == EWOULDBLOCK, ("err=%d\n", err));
495	}
496
497	mbuf_freem(pPkt);
498	}
499	else
500	AssertMsg(err == ENOMEM \|\| err == EWOULDBLOCK, ("err=%d\n", err));
501	pSG->pvUserData = NULL;
502
503	return NULL;
504	}
505
506
507	/**
508	* Calculates the number of segments required to represent the mbuf.
509	*
510	* @returns Number of segments.
511	* @param pThis The instance.
512	* @param pMBuf The mbuf.
513	* @param pvFrame The frame pointer, optional.
514	*/
515	DECLINLINE(unsigned) vboxNetFltDarwinMBufCalcSGSegs(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame)
516	{
517	NOREF(pThis);
518
519	/*
520	* Count the buffers in the chain.
521	*/
522	unsigned cSegs = 0;
523	for (mbuf_t pCur = pMBuf; pCur; pCur = mbuf_next(pCur))
524	if (mbuf_len(pCur))
525	cSegs++;
526	else if ( !cSegs
527	&& pvFrame
528	&& (uintptr_t)pvFrame - (uintptr_t)mbuf_datastart(pMBuf) < mbuf_maxlen(pMBuf))
529	cSegs++;
530
531	#ifdef PADD_RUNT_FRAMES_FROM_HOST
532	/*
533	* Add one buffer if the total is less than the ethernet minimum 60 bytes.
534	* This may allocate a segment too much if the ethernet header is separated,
535	* but that shouldn't harm us much.
536	*/
537	if (mbuf_pkthdr_len(pMBuf) < 60)
538	cSegs++;
539	#endif
540
541	#ifdef VBOXNETFLT_DARWIN_TEST_SEG_SIZE
542	/* maximize the number of segments. */
543	cSegs = RT_MAX(VBOXNETFLT_DARWIN_MAX_SEGS - 1, cSegs);
544	#endif
545
546	return cSegs ? cSegs : 1;
547	}
548
549
550	/**
551	* Initializes a SG list from an mbuf.
552	*
553	* @returns Number of segments.
554	* @param pThis The instance.
555	* @param pMBuf The mbuf.
556	* @param pSG The SG.
557	* @param pvFrame The frame pointer, optional.
558	* @param cSegs The number of segments allocated for the SG.
559	* This should match the number in the mbuf exactly!
560	* @param fSrc The source of the frame.
561	*/
562	DECLINLINE(void) vboxNetFltDarwinMBufToSG(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame, PINTNETSG pSG, unsigned cSegs, uint32_t fSrc)
563	{
564	NOREF(pThis);
565
566	/*
567	* Walk the chain and convert the buffers to segments. Works INTNETSG::cbTotal.
568	*/
569	unsigned iSeg = 0;
570	IntNetSgInitTempSegs(pSG, 0 /cbTotal/, cSegs, 0 /cSegsUsed/);
571	for (mbuf_t pCur = pMBuf; pCur; pCur = mbuf_next(pCur))
572	{
573	size_t cbSeg = mbuf_len(pCur);
574	if (cbSeg)
575	{
576	void *pvSeg = mbuf_data(pCur);
577
578	/* deal with pvFrame */
579	if (!iSeg && pvFrame && pvFrame != pvSeg)
580	{
581	void *pvStart = mbuf_datastart(pMBuf);
582	uintptr_t offSeg = (uintptr_t)pvSeg - (uintptr_t)pvStart;
583	uintptr_t offSegEnd = offSeg + cbSeg;
584	Assert(pvStart && pvSeg && offSeg < mbuf_maxlen(pMBuf) && offSegEnd <= mbuf_maxlen(pMBuf)); NOREF(offSegEnd);
585	uintptr_t offFrame = (uintptr_t)pvFrame - (uintptr_t)pvStart;
586	if (RT_LIKELY(offFrame < offSeg))
587	{
588	pvSeg = pvFrame;
589	cbSeg += offSeg - offFrame;
590	}
591	else
592	AssertMsgFailed(("pvFrame=%p pvStart=%p pvSeg=%p offSeg=%p cbSeg=%#zx offSegEnd=%p offFrame=%p maxlen=%#zx\n",
593	pvFrame, pvStart, pvSeg, offSeg, cbSeg, offSegEnd, offFrame, mbuf_maxlen(pMBuf)));
594	pvFrame = NULL;
595	}
596
597	AssertBreak(iSeg < cSegs);
598	pSG->cbTotal += cbSeg;
599	pSG->aSegs[iSeg].cb = cbSeg;
600	pSG->aSegs[iSeg].pv = pvSeg;
601	pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
602	iSeg++;
603	}
604	/* The pvFrame might be in a now empty buffer. */
605	else if ( !iSeg
606	&& pvFrame
607	&& (uintptr_t)pvFrame - (uintptr_t)mbuf_datastart(pMBuf) < mbuf_maxlen(pMBuf))
608	{
609	cbSeg = (uintptr_t)mbuf_datastart(pMBuf) + mbuf_maxlen(pMBuf) - (uintptr_t)pvFrame;
610	pSG->cbTotal += cbSeg;
611	pSG->aSegs[iSeg].cb = cbSeg;
612	pSG->aSegs[iSeg].pv = pvFrame;
613	pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
614	iSeg++;
615	pvFrame = NULL;
616	}
617	}
618
619	Assert(iSeg && iSeg <= cSegs);
620	pSG->cSegsUsed = iSeg;
621
622	#ifdef PADD_RUNT_FRAMES_FROM_HOST
623	/*
624	* Add a trailer if the frame is too small.
625	*
626	* Since we're getting to the packet before it is framed, it has not
627	* yet been padded. The current solution is to add a segment pointing
628	* to a buffer containing all zeros and pray that works for all frames...
629	*/
630	if (pSG->cbTotal < 60 && (fSrc & INTNETTRUNKDIR_HOST))
631	{
632	AssertReturnVoid(iSeg < cSegs);
633
634	static uint8_t const s_abZero[128] = {0};
635	pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
636	pSG->aSegs[iSeg].pv = (void *)&s_abZero[0];
637	pSG->aSegs[iSeg].cb = 60 - pSG->cbTotal;
638	pSG->cbTotal = 60;
639	pSG->cSegsUsed++;
640	}
641	#endif
642
643	#ifdef VBOXNETFLT_DARWIN_TEST_SEG_SIZE
644	/*
645	* Redistribute the segments.
646	*/
647	if (pSG->cSegsUsed < pSG->cSegsAlloc)
648	{
649	/* copy the segments to the end. */
650	int iSrc = pSG->cSegsUsed;
651	int iDst = pSG->cSegsAlloc;
652	while (iSrc > 0)
653	{
654	iDst--;
655	iSrc--;
656	pSG->aSegs[iDst] = pSG->aSegs[iSrc];
657	}
658
659	/* create small segments from the start. */
660	pSG->cSegsUsed = pSG->cSegsAlloc;
661	iSrc = iDst;
662	iDst = 0;
663	while ( iDst < iSrc
664	&& iDst < pSG->cSegsAlloc)
665	{
666	pSG->aSegs[iDst].Phys = NIL_RTHCPHYS;
667	pSG->aSegs[iDst].pv = pSG->aSegs[iSrc].pv;
668	pSG->aSegs[iDst].cb = RT_MIN(pSG->aSegs[iSrc].cb, VBOXNETFLT_DARWIN_TEST_SEG_SIZE);
669	if (pSG->aSegs[iDst].cb != pSG->aSegs[iSrc].cb)
670	{
671	pSG->aSegs[iSrc].cb -= pSG->aSegs[iDst].cb;
672	pSG->aSegs[iSrc].pv = (uint8_t *)pSG->aSegs[iSrc].pv + pSG->aSegs[iDst].cb;
673	}
674	else if (++iSrc >= pSG->cSegsAlloc)
675	{
676	pSG->cSegsUsed = iDst + 1;
677	break;
678	}
679	iDst++;
680	}
681	}
682	#endif
683
684	AssertMsg(!pvFrame, ("pvFrame=%p pMBuf=%p iSeg=%d\n", pvFrame, pMBuf, iSeg));
685	}
686
687
688	/**
689	* Helper for determining whether the host wants the interface to be
690	* promiscuous.
691	*/
692	static bool vboxNetFltDarwinIsPromiscuous(PVBOXNETFLTINS pThis)
693	{
694	bool fRc = false;
695	ifnet_t pIfNet = vboxNetFltDarwinRetainIfNet(pThis);
696	if (pIfNet)
697	{
698	/* gather the data */
699	uint16_t fIf = ifnet_flags(pIfNet);
700	unsigned cPromisc = VBOX_GET_PCOUNT(pIfNet);
701	bool fSetPromiscuous = ASMAtomicUoReadBool(&pThis->u.s.fSetPromiscuous);
702	vboxNetFltDarwinReleaseIfNet(pThis, pIfNet);
703
704	/* calc the return. */
705	fRc = (fIf & IFF_PROMISC)
706	&& cPromisc > fSetPromiscuous;
707	}
708	return fRc;
709	}
710
711
712
713	/**
714	*
715	* @see iff_detached_func in the darwin kpi.
716	*/
717	static void vboxNetFltDarwinIffDetached(void *pvThis, ifnet_t pIfNet)
718	{
719	PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvThis;
720	uint64_t NanoTS = RTTimeSystemNanoTS();
721	LogFlow(("vboxNetFltDarwinIffDetached: pThis=%p NanoTS=%RU64 (%d)\n",
722	pThis, NanoTS, VALID_PTR(pIfNet) ? VBOX_GET_PCOUNT(pIfNet) : -1));
723
724	Assert(!pThis->fDisconnectedFromHost);
725	Assert(!pThis->fRediscoveryPending);
726
727	/*
728	* If we've put it into promiscuous mode, undo that now. If we don't
729	* the if_pcount will go all wrong when it's replugged.
730	*/
731	if (ASMAtomicXchgBool(&pThis->u.s.fSetPromiscuous, false))
732	ifnet_set_promiscuous(pIfNet, 0);
733
734	/*
735	* We carefully take the spinlock and increase the interface reference
736	* behind it in order to avoid problematic races with the detached callback.
737	*/
738	RTSpinlockAcquire(pThis->hSpinlock);
739
740	pIfNet = ASMAtomicUoReadPtrT(&pThis->u.s.pIfNet, ifnet_t);
741	int cPromisc = VALID_PTR(pIfNet) ? VBOX_GET_PCOUNT(pIfNet) : - 1;
742
743	ASMAtomicUoWriteNullPtr(&pThis->u.s.pIfNet);
744	ASMAtomicUoWriteNullPtr(&pThis->u.s.pIfFilter);
745	ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false);
746	pThis->u.s.fSetPromiscuous = false;
747	ASMAtomicUoWriteU64(&pThis->NanoTSLastRediscovery, NanoTS);
748	ASMAtomicUoWriteBool(&pThis->fRediscoveryPending, false);
749	ASMAtomicWriteBool(&pThis->fDisconnectedFromHost, true);
750
751	RTSpinlockRelease(pThis->hSpinlock);
752
753	if (pIfNet)
754	ifnet_release(pIfNet);
755	LogRel(("VBoxNetFlt: was detached from '%s' (%d)\n", pThis->szName, cPromisc));
756	}
757
758
759	/**
760	*
761	* @see iff_ioctl_func in the darwin kpi.
762	*/
763	static errno_t vboxNetFltDarwinIffIoCtl(void pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, u_long uCmd, void pvArg)
764	{
765	PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvThis;
766	LogFlow(("vboxNetFltDarwinIffIoCtl: pThis=%p uCmd=%lx\n", pThis, uCmd));
767
768	/*
769	* Update fOtherPromiscuous.
770	*/
771	/** @todo we'll have to find the offset of if_pcount to get this right! */
772	//if (uCmd == SIOCSIFFLAGS)
773	//{
774	//
775	//}
776
777	/*
778	* We didn't handle it, continue processing.
779	*/
780	NOREF(pThis);
781	NOREF(eProtocol);
782	NOREF(uCmd);
783	NOREF(pvArg);
784	return EOPNOTSUPP;
785	}
786
787
788	/**
789	*
790	* @see iff_event_func in the darwin kpi.
791	*/
792	static void vboxNetFltDarwinIffEvent(void pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, const struct kev_msg pEvMsg)
793	{
794	PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvThis;
795	LogFlow(("vboxNetFltDarwinIffEvent: pThis=%p\n", pThis));
796
797	NOREF(pThis);
798	NOREF(pIfNet);
799	NOREF(eProtocol);
800	NOREF(pEvMsg);
801
802	/*
803	* Watch out for the interface going online / offline.
804	*/
805	if ( VALID_PTR(pThis)
806	&& VALID_PTR(pEvMsg)
807	&& pEvMsg->vendor_code == KEV_VENDOR_APPLE
808	&& pEvMsg->kev_class == KEV_NETWORK_CLASS
809	&& pEvMsg->kev_subclass == KEV_DL_SUBCLASS)
810	{
811	if (pThis->u.s.pIfNet == pIfNet)
812	{
813	if (pEvMsg->event_code == KEV_DL_LINK_ON)
814	{
815	if (ASMAtomicUoReadBool(&pThis->u.s.fNeedSetPromiscuous))
816	{
817	/* failed to bring it online. */
818	errno_t err = ifnet_set_promiscuous(pIfNet, 1);
819	if (!err)
820	{
821	ASMAtomicWriteBool(&pThis->u.s.fSetPromiscuous, true);
822	ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false);
823	Log(("vboxNetFltDarwinIffEvent: enabled promiscuous mode on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pIfNet)));
824	}
825	else
826	Log(("vboxNetFltDarwinIffEvent: ifnet_set_promiscuous failed on %s, err=%d (%d)\n", pThis->szName, err, VBOX_GET_PCOUNT(pIfNet)));
827	}
828	else if ( ASMAtomicUoReadBool(&pThis->u.s.fSetPromiscuous)
829	&& !(ifnet_flags(pIfNet) & IFF_PROMISC))
830	{
831	/* Try fix the inconsistency. */
832	errno_t err = ifnet_set_flags(pIfNet, IFF_PROMISC, IFF_PROMISC);
833	if (!err)
834	err = ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL);
835	if (!err && (ifnet_flags(pIfNet) & IFF_PROMISC))
836	Log(("vboxNetFltDarwinIffEvent: fixed IFF_PROMISC on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pIfNet)));
837	else
838	Log(("vboxNetFltDarwinIffEvent: failed to fix IFF_PROMISC on %s, err=%d flags=%#x (%d)\n",
839	pThis->szName, err, ifnet_flags(pIfNet), VBOX_GET_PCOUNT(pIfNet)));
840	}
841	else
842	Log(("vboxNetFltDarwinIffEvent: online, '%s'. flags=%#x (%d)\n", pThis->szName, ifnet_flags(pIfNet), VBOX_GET_PCOUNT(pIfNet)));
843	}
844	else if (pEvMsg->event_code == KEV_DL_LINK_OFF)
845	Log(("vboxNetFltDarwinIffEvent: %s goes down (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pIfNet)));
846	/** @todo KEV_DL_LINK_ADDRESS_CHANGED -> pfnReportMacAddress */
847	/** @todo KEV_DL_SIFFLAGS -> pfnReportPromiscuousMode */
848	}
849	else
850	Log(("vboxNetFltDarwinIffEvent: pThis->u.s.pIfNet=%p pIfNet=%p (%d)\n", pThis->u.s.pIfNet, pIfNet, VALID_PTR(pIfNet) ? VBOX_GET_PCOUNT(pIfNet) : -1));
851	}
852	else if (VALID_PTR(pEvMsg))
853	Log(("vboxNetFltDarwinIffEvent: vendor_code=%#x kev_class=%#x kev_subclass=%#x event_code=%#x\n",
854	pEvMsg->vendor_code, pEvMsg->kev_class, pEvMsg->kev_subclass, pEvMsg->event_code));
855	}
856
857
858	/**
859	* Internal worker for vboxNetFltDarwinIffInput and vboxNetFltDarwinIffOutput,
860	*
861	* @returns 0 or EJUSTRETURN.
862	* @param pThis The instance.
863	* @param pMBuf The mbuf.
864	* @param pvFrame The start of the frame, optional.
865	* @param fSrc Where the packet (allegedly) comes from, one INTNETTRUNKDIR_* value.
866	* @param eProtocol The protocol.
867	*/
868	static errno_t vboxNetFltDarwinIffInputOutputWorker(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame,
869	uint32_t fSrc, protocol_family_t eProtocol)
870	{
871	/*
872	* Drop it immediately?
873	*/
874	Log2(("vboxNetFltDarwinIffInputOutputWorker: pThis=%p pMBuf=%p pvFrame=%p fSrc=%#x cbPkt=%x\n",
875	pThis, pMBuf, pvFrame, fSrc, pMBuf ? mbuf_pkthdr_len(pMBuf) : -1));
876	if (!pMBuf)
877	return 0;
878	#if 0 /* debugging lost icmp packets */
879	if (mbuf_pkthdr_len(pMBuf) > 0x300)
880	{
881	uint8_t pb = (uint8_t )(pvFrame ? pvFrame : mbuf_data(pMBuf));
882	Log3(("D=%.6Rhxs S=%.6Rhxs T=%04x IFF\n", pb, pb + 6, RT_BE2H_U16((uint16_t )(pb + 12))));
883	}
884	#endif
885	if (vboxNetFltDarwinMBufIsOur(pThis, pMBuf, pvFrame))
886	return 0;
887
888	/*
889	* Active? Retain the instance and increment the busy counter.
890	*/
891	if (!vboxNetFltTryRetainBusyActive(pThis))
892	return 0;
893
894	/*
895	* Finalize out-bound packets since the stack puts off finalizing
896	* TCP/IP checksums as long as possible.
897	* ASSUMES this only applies to outbound IP packets.
898	*/
899	if ( (fSrc & INTNETTRUNKDIR_HOST)
900	&& eProtocol == PF_INET)
901	{
902	Assert(!pvFrame);
903	mbuf_outbound_finalize(pMBuf, eProtocol, sizeof(RTNETETHERHDR));
904	}
905
906	/*
907	* Create a (scatter/)gather list for the mbuf and feed it to the internal network.
908	*/
909	bool fDropIt = false;
910	unsigned cSegs = vboxNetFltDarwinMBufCalcSGSegs(pThis, pMBuf, pvFrame);
911	if (cSegs < VBOXNETFLT_DARWIN_MAX_SEGS)
912	{
913	PINTNETSG pSG = (PINTNETSG)alloca(RT_OFFSETOF(INTNETSG, aSegs[cSegs]));
914	vboxNetFltDarwinMBufToSG(pThis, pMBuf, pvFrame, pSG, cSegs, fSrc);
915
916	fDropIt = pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL /* pvIf */, pSG, fSrc);
917	if (fDropIt)
918	{
919	/*
920	* Check if this interface is in promiscuous mode. We should not drop
921	* any packets before they get to the driver as it passes them to tap
922	* callbacks in order for BPF to work properly.
923	*/
924	if (vboxNetFltDarwinIsPromiscuous(pThis))
925	fDropIt = false;
926	else
927	mbuf_freem(pMBuf);
928	}
929	}
930
931	vboxNetFltRelease(pThis, true /* fBusy */);
932
933	return fDropIt ? EJUSTRETURN : 0;
934	}
935
936
937	/**
938	* From the host.
939	*
940	* @see iff_output_func in the darwin kpi.
941	*/
942	static errno_t vboxNetFltDarwinIffOutput(void pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, mbuf_t ppMBuf)
943	{
944	/** @todo there was some note about the ethernet header here or something like that... */
945
946	NOREF(eProtocol);
947	NOREF(pIfNet);
948	return vboxNetFltDarwinIffInputOutputWorker((PVBOXNETFLTINS)pvThis, *ppMBuf, NULL, INTNETTRUNKDIR_HOST, eProtocol);
949	}
950
951
952	/**
953	* From the wire.
954	*
955	* @see iff_input_func in the darwin kpi.
956	*/
957	static errno_t vboxNetFltDarwinIffInput(void pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, mbuf_t ppMBuf, char **ppchFrame)
958	{
959	NOREF(eProtocol);
960	NOREF(pIfNet);
961	return vboxNetFltDarwinIffInputOutputWorker((PVBOXNETFLTINS)pvThis, ppMBuf, ppchFrame, INTNETTRUNKDIR_WIRE, eProtocol);
962	}
963
964
965	/** A worker thread for vboxNetFltSendDummy(). */
966	static DECLCALLBACK(int) vboxNetFltSendDummyWorker(RTTHREAD hThreadSelf, void *pvUser)
967	{
968	Assert(pvUser);
969	ifnet_t pIfNet = (ifnet_t)pvUser;
970	return VBoxNetSendDummy(pIfNet);
971	}
972
973
974	/**
975	* Prevent GUI icon freeze issue when VirtualBoxVM process terminates.
976	*
977	* This function is a workaround for stuck-in-dock issue. The idea here is to
978	* send a dummy packet to an interface from the context of a kernel thread.
979	* Therefore, an XNU's receive thread (which is created as a result if we are
980	* the first who is communicating with the interface) will be associated with
981	* the kernel thread instead of VirtualBoxVM process.
982	*
983	* @param pIfNet Interface to be used to send data.
984	*/
985	static void vboxNetFltSendDummy(ifnet_t pIfNet)
986	{
987	RTTHREAD hThread;
988	int rc = RTThreadCreate(&hThread, vboxNetFltSendDummyWorker, (void *)pIfNet, 0,
989	RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "DummyThread");
990	if (RT_SUCCESS(rc))
991	{
992	RTThreadWait(hThread, RT_INDEFINITE_WAIT, NULL);
993	LogFlow(("vboxNetFltSendDummy: a dummy packet has been successfully sent in order to prevent stuck-in-dock issue\n"));
994	}
995	else
996	LogFlow(("vboxNetFltSendDummy: unable to send dummy packet in order to prevent stuck-in-dock issue\n"));
997	}
998
999
1000	/**
1001	* Internal worker for vboxNetFltOsInitInstance and vboxNetFltOsMaybeRediscovered.
1002	*
1003	* @returns VBox status code.
1004	* @param pThis The instance.
1005	* @param fRediscovery If set we're doing a rediscovery attempt, so, don't
1006	* flood the release log.
1007	*/
1008	static int vboxNetFltDarwinAttachToInterface(PVBOXNETFLTINS pThis, bool fRediscovery)
1009	{
1010	LogFlow(("vboxNetFltDarwinAttachToInterface: pThis=%p (%s)\n", pThis, pThis->szName));
1011
1012	/*
1013	* Locate the interface first.
1014	*
1015	* The pIfNet member is updated before iflt_attach is called and used
1016	* to deal with the hypothetical case where someone rips out the
1017	* interface immediately after our iflt_attach call.
1018	*/
1019	ifnet_t pIfNet = NULL;
1020	errno_t err = ifnet_find_by_name(pThis->szName, &pIfNet);
1021	if (err)
1022	{
1023	Assert(err == ENXIO);
1024	if (!fRediscovery)
1025	LogRel(("VBoxFltDrv: failed to find ifnet '%s' (err=%d)\n", pThis->szName, err));
1026	else
1027	Log(("VBoxFltDrv: failed to find ifnet '%s' (err=%d)\n", pThis->szName, err));
1028	return VERR_INTNET_FLT_IF_NOT_FOUND;
1029	}
1030
1031	RTSpinlockAcquire(pThis->hSpinlock);
1032	ASMAtomicUoWritePtr(&pThis->u.s.pIfNet, pIfNet);
1033	RTSpinlockRelease(pThis->hSpinlock);
1034
1035	/* Adjust g_offIfNetPCount as it varies for different versions of xnu. */
1036	vboxNetFltDarwinDetectPCountOffset(pIfNet);
1037
1038	/* Prevent stuck-in-dock issue by associating interface receive thread with kernel thread. */
1039	vboxNetFltSendDummy(pIfNet);
1040
1041	/*
1042	* Get the mac address while we still have a valid ifnet reference.
1043	*/
1044	err = ifnet_lladdr_copy_bytes(pIfNet, &pThis->u.s.MacAddr, sizeof(pThis->u.s.MacAddr));
1045	if (!err)
1046	{
1047	/*
1048	* Try attach the filter.
1049	*/
1050	struct iff_filter RegRec;
1051	RegRec.iff_cookie = pThis;
1052	RegRec.iff_name = "VBoxNetFlt";
1053	RegRec.iff_protocol = 0;
1054	RegRec.iff_input = vboxNetFltDarwinIffInput;
1055	RegRec.iff_output = vboxNetFltDarwinIffOutput;
1056	RegRec.iff_event = vboxNetFltDarwinIffEvent;
1057	RegRec.iff_ioctl = vboxNetFltDarwinIffIoCtl;
1058	RegRec.iff_detached = vboxNetFltDarwinIffDetached;
1059	interface_filter_t pIfFilter = NULL;
1060	err = iflt_attach(pIfNet, &RegRec, &pIfFilter);
1061	Assert(err \|\| pIfFilter);
1062
1063	RTSpinlockAcquire(pThis->hSpinlock);
1064	pIfNet = ASMAtomicUoReadPtrT(&pThis->u.s.pIfNet, ifnet_t);
1065	if (pIfNet && !err)
1066	{
1067	ASMAtomicUoWriteBool(&pThis->fDisconnectedFromHost, false);
1068	ASMAtomicUoWritePtr(&pThis->u.s.pIfFilter, pIfFilter);
1069	pIfNet = NULL; /* don't dereference it */
1070	}
1071	RTSpinlockRelease(pThis->hSpinlock);
1072
1073	/* Report capabilities. */
1074	if ( !pIfNet
1075	&& vboxNetFltTryRetainBusyNotDisconnected(pThis))
1076	{
1077	Assert(pThis->pSwitchPort);
1078	pThis->pSwitchPort->pfnReportMacAddress(pThis->pSwitchPort, &pThis->u.s.MacAddr);
1079	pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort, vboxNetFltDarwinIsPromiscuous(pThis));
1080	pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort, 0, INTNETTRUNKDIR_WIRE \| INTNETTRUNKDIR_HOST);
1081	pThis->pSwitchPort->pfnReportNoPreemptDsts(pThis->pSwitchPort, 0 /* none */);
1082	vboxNetFltRelease(pThis, true /fBusy/);
1083	}
1084	}
1085
1086	/* Release the interface on failure. */
1087	if (pIfNet)
1088	ifnet_release(pIfNet);
1089
1090	int rc = RTErrConvertFromErrno(err);
1091	if (RT_SUCCESS(rc))
1092	LogRel(("VBoxFltDrv: attached to '%s' / %.*Rhxs\n", pThis->szName, sizeof(pThis->u.s.MacAddr), &pThis->u.s.MacAddr));
1093	else
1094	LogRel(("VBoxFltDrv: failed to attach to ifnet '%s' (err=%d)\n", pThis->szName, err));
1095	return rc;
1096	}
1097
1098
1099	bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis)
1100	{
1101	vboxNetFltDarwinAttachToInterface(pThis, true /* fRediscovery */);
1102	return !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
1103	}
1104
1105
1106	int vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
1107	{
1108	NOREF(pvIfData);
1109
1110	int rc = VINF_SUCCESS;
1111	ifnet_t pIfNet = vboxNetFltDarwinRetainIfNet(pThis);
1112	if (pIfNet)
1113	{
1114	/*
1115	* Create a mbuf for the gather list and push it onto the wire.
1116	*
1117	* Note! If the interface is in the promiscuous mode we need to send the
1118	* packet down the stack so it reaches the driver and Berkeley
1119	* Packet Filter (see @bugref{5817}).
1120	*/
1121	if ((fDst & INTNETTRUNKDIR_WIRE) \|\| vboxNetFltDarwinIsPromiscuous(pThis))
1122	{
1123	mbuf_t pMBuf = vboxNetFltDarwinMBufFromSG(pThis, pSG);
1124	if (pMBuf)
1125	{
1126	errno_t err = ifnet_output_raw(pIfNet, PF_LINK, pMBuf);
1127	if (err)
1128	rc = RTErrConvertFromErrno(err);
1129	}
1130	else
1131	rc = VERR_NO_MEMORY;
1132	}
1133
1134	/*
1135	* Create a mbuf for the gather list and push it onto the host stack.
1136	*/
1137	if (fDst & INTNETTRUNKDIR_HOST)
1138	{
1139	mbuf_t pMBuf = vboxNetFltDarwinMBufFromSG(pThis, pSG);
1140	if (pMBuf)
1141	{
1142	/* This is what IONetworkInterface::inputPacket does. */
1143	unsigned const cbEthHdr = 14;
1144	mbuf_pkthdr_setheader(pMBuf, mbuf_data(pMBuf));
1145	mbuf_pkthdr_setlen(pMBuf, mbuf_pkthdr_len(pMBuf) - cbEthHdr);
1146	mbuf_setdata(pMBuf, (uint8_t *)mbuf_data(pMBuf) + cbEthHdr, mbuf_len(pMBuf) - cbEthHdr);
1147	mbuf_pkthdr_setrcvif(pMBuf, pIfNet); /* will crash without this. */
1148
1149	errno_t err = ifnet_input(pIfNet, pMBuf, NULL);
1150	if (err)
1151	rc = RTErrConvertFromErrno(err);
1152	}
1153	else
1154	rc = VERR_NO_MEMORY;
1155	}
1156
1157	vboxNetFltDarwinReleaseIfNet(pThis, pIfNet);
1158	}
1159
1160	return rc;
1161	}
1162
1163
1164	void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive)
1165	{
1166	ifnet_t pIfNet = vboxNetFltDarwinRetainIfNet(pThis);
1167	if (pIfNet)
1168	{
1169	if (pThis->fDisablePromiscuous)
1170	{
1171	/*
1172	* Promiscuous mode should not be used (wireless), we just need to
1173	* make sure the interface is up.
1174	*/
1175	if (fActive)
1176	{
1177	u_int16_t fIf = ifnet_flags(pIfNet);
1178	if ((fIf & (IFF_UP \| IFF_RUNNING)) != (IFF_UP \| IFF_RUNNING))
1179	{
1180	ifnet_set_flags(pIfNet, IFF_UP, IFF_UP);
1181	ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL);
1182	}
1183	}
1184	}
1185	else
1186	{
1187	/*
1188	* This api is a bit weird, the best reference is the code.
1189	*
1190	* Also, we have a bit or race conditions wrt the maintenance of
1191	* host the interface promiscuity for vboxNetFltPortOsIsPromiscuous.
1192	*/
1193	unsigned const cPromiscBefore = VBOX_GET_PCOUNT(pIfNet);
1194	u_int16_t fIf;
1195	if (fActive)
1196	{
1197	Assert(!pThis->u.s.fSetPromiscuous);
1198	errno_t err = ENETDOWN;
1199	ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, true);
1200
1201	/*
1202	* Try bring the interface up and running if it's down.
1203	*/
1204	fIf = ifnet_flags(pIfNet);
1205	if ((fIf & (IFF_UP \| IFF_RUNNING)) != (IFF_UP \| IFF_RUNNING))
1206	{
1207	err = ifnet_set_flags(pIfNet, IFF_UP, IFF_UP);
1208	errno_t err2 = ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL);
1209	if (!err)
1210	err = err2;
1211	fIf = ifnet_flags(pIfNet);
1212	}
1213
1214	/*
1215	* Is it already up? If it isn't, leave it to the link event or
1216	* we'll upset if_pcount (as stated above, ifnet_set_promiscuous is weird).
1217	*/
1218	if ((fIf & (IFF_UP \| IFF_RUNNING)) == (IFF_UP \| IFF_RUNNING))
1219	{
1220	err = ifnet_set_promiscuous(pIfNet, 1);
1221	pThis->u.s.fSetPromiscuous = err == 0;
1222	if (!err)
1223	{
1224	ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false);
1225
1226	/* check if it actually worked, this stuff is not always behaving well. */
1227	if (!(ifnet_flags(pIfNet) & IFF_PROMISC))
1228	{
1229	err = ifnet_set_flags(pIfNet, IFF_PROMISC, IFF_PROMISC);
1230	if (!err)
1231	err = ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL);
1232	if (!err)
1233	Log(("vboxNetFlt: fixed IFF_PROMISC on %s (%d->%d)\n", pThis->szName, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
1234	else
1235	Log(("VBoxNetFlt: failed to fix IFF_PROMISC on %s, err=%d (%d->%d)\n",
1236	pThis->szName, err, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
1237	}
1238	}
1239	else
1240	Log(("VBoxNetFlt: ifnet_set_promiscuous -> err=%d grr! (%d->%d)\n", err, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
1241	}
1242	else if (!err)
1243	Log(("VBoxNetFlt: Waiting for the link to come up... (%d->%d)\n", cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
1244	if (err)
1245	LogRel(("VBoxNetFlt: Failed to put '%s' into promiscuous mode, err=%d (%d->%d)\n", pThis->szName, err, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
1246	}
1247	else
1248	{
1249	ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false);
1250	if (pThis->u.s.fSetPromiscuous)
1251	{
1252	errno_t err = ifnet_set_promiscuous(pIfNet, 0);
1253	AssertMsg(!err, ("%d\n", err)); NOREF(err);
1254	}
1255	pThis->u.s.fSetPromiscuous = false;
1256
1257	fIf = ifnet_flags(pIfNet);
1258	Log(("VBoxNetFlt: fIf=%#x; %d->%d\n", fIf, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
1259	}
1260	}
1261
1262	vboxNetFltDarwinReleaseIfNet(pThis, pIfNet);
1263	}
1264	}
1265
1266
1267	int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis)
1268	{
1269	/* Nothing to do here. */
1270	return VINF_SUCCESS;
1271	}
1272
1273
1274	int vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis)
1275	{
1276	/* Nothing to do here. */
1277	return VINF_SUCCESS;
1278	}
1279
1280
1281	void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis)
1282	{
1283	interface_filter_t pIfFilter;
1284
1285	/*
1286	* Carefully obtain the interface filter reference and detach it.
1287	*/
1288	RTSpinlockAcquire(pThis->hSpinlock);
1289	pIfFilter = ASMAtomicUoReadPtrT(&pThis->u.s.pIfFilter, interface_filter_t);
1290	if (pIfFilter)
1291	ASMAtomicUoWriteNullPtr(&pThis->u.s.pIfFilter);
1292	RTSpinlockRelease(pThis->hSpinlock);
1293
1294	if (pIfFilter)
1295	iflt_detach(pIfFilter);
1296	}
1297
1298
1299	int vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext)
1300	{
1301	NOREF(pvContext);
1302	return vboxNetFltDarwinAttachToInterface(pThis, false /* fRediscovery */);
1303	}
1304
1305
1306	int vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis)
1307	{
1308	/*
1309	* Init the darwin specific members.
1310	*/
1311	pThis->u.s.pIfNet = NULL;
1312	pThis->u.s.pIfFilter = NULL;
1313	pThis->u.s.fSetPromiscuous = false;
1314	pThis->u.s.fNeedSetPromiscuous = false;
1315	//pThis->u.s.MacAddr = {0};
1316
1317	return VINF_SUCCESS;
1318	}
1319
1320
1321	void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac)
1322	{
1323	NOREF(pThis); NOREF(pvIfData); NOREF(pMac);
1324	}
1325
1326
1327	int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void pvIf, void *ppvIfData)
1328	{
1329	/* Nothing to do */
1330	NOREF(pThis); NOREF(pvIf); NOREF(ppvIfData);
1331	return VINF_SUCCESS;
1332	}
1333
1334
1335	int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData)
1336	{
1337	/* Nothing to do */
1338	NOREF(pThis); NOREF(pvIfData);
1339	return VINF_SUCCESS;
1340	}
1341

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/HostDrivers/VBoxNetFlt/darwin/VBoxNetFlt-darwin.cpp@ 52618

Download in other formats: