VBoxNetFlt-linux.c@ 28112

Last change on this file since 28112 was 28070, checked in by vboxsync, 15 years ago
VBoxNetFlt: Deal with multi segment SG buffers. TODO: One weird windows code path.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 37.3 KB

Line
1	/* $Id: VBoxNetFlt-linux.c 28070 2010-04-07 23:20:09Z vboxsync $ */
2	/** @file
3	* VBoxNetFlt - Network Filter Driver (Host), Linux Specific Code.
4	*/
5
6	/*
7	* Copyright (C) 2006-2008 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22	/*******************************************************************************
23	* Header Files *
24	*******************************************************************************/
25	#include "the-linux-kernel.h"
26	#include "version-generated.h"
27	#include <linux/netdevice.h>
28	#include <linux/etherdevice.h>
29	#include <linux/rtnetlink.h>
30	#include <linux/miscdevice.h>
31	#include <linux/ip.h>
32
33	#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
34	#include <VBox/log.h>
35	#include <VBox/err.h>
36	#include <VBox/intnetinline.h>
37	#include <iprt/alloca.h>
38	#include <iprt/assert.h>
39	#include <iprt/spinlock.h>
40	#include <iprt/semaphore.h>
41	#include <iprt/initterm.h>
42	#include <iprt/process.h>
43	#include <iprt/mem.h>
44	#include <iprt/log.h>
45	#include <iprt/mp.h>
46	#include <iprt/mem.h>
47	#include <iprt/time.h>
48
49	#define VBOXNETFLT_OS_SPECFIC 1
50	#include "../VBoxNetFltInternal.h"
51
52	#define VBOX_FLT_NB_TO_INST(pNB) ((PVBOXNETFLTINS)((uint8_t *)pNB - \
53	RT_OFFSETOF(VBOXNETFLTINS, u.s.Notifier)))
54	#define VBOX_FLT_PT_TO_INST(pPT) ((PVBOXNETFLTINS)((uint8_t *)pPT - \
55	RT_OFFSETOF(VBOXNETFLTINS, u.s.PacketType)))
56	#define VBOX_FLT_XT_TO_INST(pXT) ((PVBOXNETFLTINS)((uint8_t *)pXT - \
57	RT_OFFSETOF(VBOXNETFLTINS, u.s.XmitTask)))
58
59	#define VBOX_GET_PCOUNT(pDev) (pDev->promiscuity)
60
61	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22)
62	# define VBOX_SKB_RESET_NETWORK_HDR(skb) skb_reset_network_header(skb)
63	# define VBOX_SKB_RESET_MAC_HDR(skb) skb_reset_mac_header(skb)
64	#else /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) */
65	# define VBOX_SKB_RESET_NETWORK_HDR(skb) skb->nh.raw = skb->data
66	# define VBOX_SKB_RESET_MAC_HDR(skb) skb->mac.raw = skb->data
67	#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) */
68
69	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
70	# define VBOX_SKB_CHECKSUM_HELP(skb) skb_checksum_help(skb)
71	#else /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19) */
72	# define CHECKSUM_PARTIAL CHECKSUM_HW
73	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10)
74	# define VBOX_SKB_CHECKSUM_HELP(skb) skb_checksum_help(skb, 0)
75	# else /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 10) */
76	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 7)
77	# define VBOX_SKB_CHECKSUM_HELP(skb) skb_checksum_help(&skb, 0)
78	# else /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 7) */
79	# define VBOX_SKB_CHECKSUM_HELP(skb) (!skb_checksum_help(skb))
80	# endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 7) */
81	# endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 10) */
82	#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19) */
83
84	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18)
85	# define VBOX_SKB_IS_GSO(skb) skb_is_gso(skb)
86	/* No features, very dumb device */
87	# define VBOX_SKB_GSO_SEGMENT(skb) skb_gso_segment(skb, 0)
88	#else /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18) */
89	# define VBOX_SKB_IS_GSO(skb) false
90	# define VBOX_SKB_GSO_SEGMENT(skb) NULL
91	#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18) */
92
93	#ifndef NET_IP_ALIGN
94	# define NET_IP_ALIGN 2
95	#endif
96
97	#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 12)
98	unsigned dev_get_flags(const struct net_device *dev)
99	{
100	unsigned flags;
101
102	flags = (dev->flags & ~(IFF_PROMISC \|
103	IFF_ALLMULTI \|
104	IFF_RUNNING)) \|
105	(dev->gflags & (IFF_PROMISC \|
106	IFF_ALLMULTI));
107
108	if (netif_running(dev) && netif_carrier_ok(dev))
109	flags \|= IFF_RUNNING;
110
111	return flags;
112	}
113	#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 12) */
114
115	/*******************************************************************************
116	* Internal Functions *
117	*******************************************************************************/
118	static int VBoxNetFltLinuxInit(void);
119	static void VBoxNetFltLinuxUnload(void);
120
121
122	/*******************************************************************************
123	* Global Variables *
124	*******************************************************************************/
125	/**
126	* The (common) global data.
127	*/
128	static VBOXNETFLTGLOBALS g_VBoxNetFltGlobals;
129
130	module_init(VBoxNetFltLinuxInit);
131	module_exit(VBoxNetFltLinuxUnload);
132
133	MODULE_AUTHOR("Sun Microsystems, Inc.");
134	MODULE_DESCRIPTION("VirtualBox Network Filter Driver");
135	MODULE_LICENSE("GPL");
136	#ifdef MODULE_VERSION
137	MODULE_VERSION(VBOX_VERSION_STRING " (" RT_XSTR(INTNETTRUNKIFPORT_VERSION) ")");
138	#endif
139
140
141	/**
142	* Initialize module.
143	*
144	* @returns appropriate status code.
145	*/
146	static int __init VBoxNetFltLinuxInit(void)
147	{
148	int rc;
149	/*
150	* Initialize IPRT.
151	*/
152	rc = RTR0Init(0);
153	if (RT_SUCCESS(rc))
154	{
155	Log(("VBoxNetFltLinuxInit\n"));
156
157	/*
158	* Initialize the globals and connect to the support driver.
159	*
160	* This will call back vboxNetFltOsOpenSupDrv (and maybe vboxNetFltOsCloseSupDrv)
161	* for establishing the connect to the support driver.
162	*/
163	memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
164	rc = vboxNetFltInitGlobalsAndIdc(&g_VBoxNetFltGlobals);
165	if (RT_SUCCESS(rc))
166	{
167	LogRel(("VBoxNetFlt: Successfully started.\n"));
168	return 0;
169	}
170
171	LogRel(("VBoxNetFlt: failed to initialize device extension (rc=%d)\n", rc));
172	RTR0Term();
173	}
174	else
175	LogRel(("VBoxNetFlt: failed to initialize IPRT (rc=%d)\n", rc));
176
177	memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
178	return -RTErrConvertToErrno(rc);
179	}
180
181
182	/**
183	* Unload the module.
184	*
185	* @todo We have to prevent this if we're busy!
186	*/
187	static void __exit VBoxNetFltLinuxUnload(void)
188	{
189	int rc;
190	Log(("VBoxNetFltLinuxUnload\n"));
191	Assert(vboxNetFltCanUnload(&g_VBoxNetFltGlobals));
192
193	/*
194	* Undo the work done during start (in reverse order).
195	*/
196	rc = vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltGlobals);
197	AssertRC(rc); NOREF(rc);
198
199	RTR0Term();
200
201	memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
202
203	Log(("VBoxNetFltLinuxUnload - done\n"));
204	}
205
206
207	/**
208	* Reads and retains the host interface handle.
209	*
210	* @returns The handle, NULL if detached.
211	* @param pThis
212	*/
213	DECLINLINE(struct net_device *) vboxNetFltLinuxRetainNetDev(PVBOXNETFLTINS pThis)
214	{
215	#if 0
216	RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
217	struct net_device *pDev = NULL;
218
219	Log(("vboxNetFltLinuxRetainNetDev\n"));
220	/*
221	* Be careful here to avoid problems racing the detached callback.
222	*/
223	RTSpinlockAcquire(pThis->hSpinlock, &Tmp);
224	if (!ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost))
225	{
226	pDev = (struct net_device )ASMAtomicUoReadPtr((void volatile *)&pThis->u.s.pDev);
227	if (pDev)
228	{
229	dev_hold(pDev);
230	Log(("vboxNetFltLinuxRetainNetDev: Device %p(%s) retained. ref=%d\n", pDev, pDev->name, atomic_read(&pDev->refcnt)));
231	}
232	}
233	RTSpinlockRelease(pThis->hSpinlock, &Tmp);
234
235	Log(("vboxNetFltLinuxRetainNetDev - done\n"));
236	return pDev;
237	#else
238	return (struct net_device )ASMAtomicUoReadPtr((void volatile *)&pThis->u.s.pDev);
239	#endif
240	}
241
242
243	/**
244	* Release the host interface handle previously retained
245	* by vboxNetFltLinuxRetainNetDev.
246	*
247	* @param pThis The instance.
248	* @param pDev The vboxNetFltLinuxRetainNetDev
249	* return value, NULL is fine.
250	*/
251	DECLINLINE(void) vboxNetFltLinuxReleaseNetDev(PVBOXNETFLTINS pThis, struct net_device *pDev)
252	{
253	#if 0
254	Log(("vboxNetFltLinuxReleaseNetDev\n"));
255	NOREF(pThis);
256	if (pDev)
257	{
258	dev_put(pDev);
259	Log(("vboxNetFltLinuxReleaseNetDev: Device %p(%s) released. ref=%d\n", pDev, pDev->name, atomic_read(&pDev->refcnt)));
260	}
261	Log(("vboxNetFltLinuxReleaseNetDev - done\n"));
262	#endif
263	}
264
265	#define VBOXNETFLT_CB_TAG(skb) (0xA1C90000 \| (skb->dev->ifindex & 0xFFFF))
266	#define VBOXNETFLT_SKB_TAG(skb) ((uint32_t)&((skb)->cb[sizeof((skb)->cb)-sizeof(uint32_t)]))
267
268	/**
269	* Checks whether this is an mbuf created by vboxNetFltLinuxMBufFromSG,
270	* i.e. a buffer which we're pushing and should be ignored by the filter callbacks.
271	*
272	* @returns true / false accordingly.
273	* @param pBuf The sk_buff.
274	*/
275	DECLINLINE(bool) vboxNetFltLinuxSkBufIsOur(struct sk_buff *pBuf)
276	{
277	return VBOXNETFLT_SKB_TAG(pBuf) == VBOXNETFLT_CB_TAG(pBuf);
278	}
279
280
281	/**
282	* Internal worker that create a linux sk_buff for a
283	* (scatter/)gather list.
284	*
285	* @returns Pointer to the sk_buff.
286	* @param pThis The instance.
287	* @param pSG The (scatter/)gather list.
288	*/
289	static struct sk_buff *vboxNetFltLinuxSkBufFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG, bool fDstWire)
290	{
291	struct sk_buff *pPkt;
292	struct net_device *pDev;
293
294	if (pSG->cbTotal == 0)
295	{
296	LogRel(("VBoxNetFlt: Dropped empty packet coming from internal network.\n"));
297	return NULL;
298	}
299
300	/*
301	* Allocate a packet and copy over the data.
302	*/
303	pDev = (struct net_device )ASMAtomicUoReadPtr((void volatile *)&pThis->u.s.pDev);
304	pPkt = dev_alloc_skb(pSG->cbTotal + NET_IP_ALIGN);
305	if (RT_UNLIKELY(!pPkt))
306	{
307	Log(("vboxNetFltLinuxSkBufFromSG: Failed to allocate sk_buff(%u).\n", pSG->cbTotal));
308	pSG->pvUserData = NULL;
309	return NULL;
310	}
311
312	pPkt->dev = pDev;
313
314	/* Align IP header on 16-byte boundary: 2 + 14 (ethernet hdr size). */
315	skb_reserve(pPkt, NET_IP_ALIGN);
316
317	/* Copy the segments. */
318	skb_put(pPkt, pSG->cbTotal);
319	INTNETSgRead(pSG, pPkt->data);
320
321	/* Set protocol and packet_type fields. */
322	pPkt->protocol = eth_type_trans(pPkt, pDev);
323	pPkt->ip_summed = CHECKSUM_NONE;
324	if (fDstWire)
325	{
326	VBOX_SKB_RESET_NETWORK_HDR(pPkt);
327	/* Restore ethernet header back. */
328	skb_push(pPkt, ETH_HLEN);
329	VBOX_SKB_RESET_MAC_HDR(pPkt);
330	}
331	VBOXNETFLT_SKB_TAG(pPkt) = VBOXNETFLT_CB_TAG(pPkt);
332
333	return pPkt;
334	}
335
336
337	/**
338	* Initializes a SG list from an sk_buff.
339	*
340	* @returns Number of segments.
341	* @param pThis The instance.
342	* @param pBuf The sk_buff.
343	* @param pSG The SG.
344	* @param pvFrame The frame pointer, optional.
345	* @param cSegs The number of segments allocated for the SG.
346	* This should match the number in the mbuf exactly!
347	* @param fSrc The source of the frame.
348	*/
349	DECLINLINE(void) vboxNetFltLinuxSkBufToSG(PVBOXNETFLTINS pThis, struct sk_buff *pBuf, PINTNETSG pSG, unsigned cSegs, uint32_t fSrc)
350	{
351	int i;
352	NOREF(pThis);
353
354	Assert(!skb_shinfo(pBuf)->frag_list);
355
356	if (fSrc & INTNETTRUNKDIR_WIRE)
357	{
358	/*
359	* The packet came from wire, ethernet header was removed by device driver.
360	* Restore it.
361	*/
362	skb_push(pBuf, ETH_HLEN);
363	}
364
365	INTNETSgInitTempSegs(pSG, pBuf->len, cSegs, 0 /cSegsUsed/);
366
367	#ifdef VBOXNETFLT_SG_SUPPORT
368	pSG->aSegs[0].cb = skb_headlen(pBuf);
369	pSG->aSegs[0].pv = pBuf->data;
370	pSG->aSegs[0].Phys = NIL_RTHCPHYS;
371
372	for (i = 0; i < skb_shinfo(pBuf)->nr_frags; i++)
373	{
374	skb_frag_t *pFrag = &skb_shinfo(pBuf)->frags[i];
375	pSG->aSegs[i+1].cb = pFrag->size;
376	pSG->aSegs[i+1].pv = kmap(pFrag->page);
377	printk("%p = kmap()\n", pSG->aSegs[i+1].pv);
378	pSG->aSegs[i+1].Phys = NIL_RTHCPHYS;
379	}
380	++i;
381
382	#else
383	pSG->aSegs[0].cb = pBuf->len;
384	pSG->aSegs[0].pv = pBuf->data;
385	pSG->aSegs[0].Phys = NIL_RTHCPHYS;
386	i = 1;
387	#endif
388
389	pSG->cSegsUsed = i;
390
391	#ifdef PADD_RUNT_FRAMES_FROM_HOST
392	/*
393	* Add a trailer if the frame is too small.
394	*
395	* Since we're getting to the packet before it is framed, it has not
396	* yet been padded. The current solution is to add a segment pointing
397	* to a buffer containing all zeros and pray that works for all frames...
398	*/
399	if (pSG->cbTotal < 60 && (fSrc & INTNETTRUNKDIR_HOST))
400	{
401	static uint8_t const s_abZero[128] = {0};
402
403	AssertReturnVoid(i < cSegs);
404
405	pSG->aSegs[i].Phys = NIL_RTHCPHYS;
406	pSG->aSegs[i].pv = (void *)&s_abZero[0];
407	pSG->aSegs[i].cb = 60 - pSG->cbTotal;
408	pSG->cbTotal = 60;
409	pSG->cSegsUsed++;
410	Assert(i + 1 <= pSG->cSegsAlloc)
411	}
412	#endif
413
414	Log4(("vboxNetFltLinuxSkBufToSG: allocated=%d, segments=%d frags=%d next=%p frag_list=%p pkt_type=%x fSrc=%x\n",
415	pSG->cSegsAlloc, pSG->cSegsUsed, skb_shinfo(pBuf)->nr_frags, pBuf->next, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type, fSrc));
416	for (i = 0; i < pSG->cSegsUsed; i++)
417	Log4(("vboxNetFltLinuxSkBufToSG: #%d: cb=%d pv=%p\n",
418	i, pSG->aSegs[i].cb, pSG->aSegs[i].pv));
419	}
420
421	/**
422	* Packet handler,
423	*
424	* @returns 0 or EJUSTRETURN.
425	* @param pThis The instance.
426	* @param pMBuf The mbuf.
427	* @param pvFrame The start of the frame, optional.
428	* @param fSrc Where the packet (allegedly) comes from, one INTNETTRUNKDIR_* value.
429	* @param eProtocol The protocol.
430	*/
431	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 14)
432	static int vboxNetFltLinuxPacketHandler(struct sk_buff *pBuf,
433	struct net_device *pSkbDev,
434	struct packet_type *pPacketType,
435	struct net_device *pOrigDev)
436	#else
437	static int vboxNetFltLinuxPacketHandler(struct sk_buff *pBuf,
438	struct net_device *pSkbDev,
439	struct packet_type *pPacketType)
440	#endif
441	{
442	PVBOXNETFLTINS pThis;
443	struct net_device *pDev;
444	LogFlow(("vboxNetFltLinuxPacketHandler: pBuf=%p pSkbDev=%p pPacketType=%p\n",
445	pBuf, pSkbDev, pPacketType));
446	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18)
447	Log3(("vboxNetFltLinuxPacketHandler: skb len=%u data_len=%u truesize=%u next=%p nr_frags=%u gso_size=%u gso_seqs=%u gso_type=%x frag_list=%p pkt_type=%x\n",
448	pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next, skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->gso_size, skb_shinfo(pBuf)->gso_segs, skb_shinfo(pBuf)->gso_type, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type));
449	#else
450	Log3(("vboxNetFltLinuxPacketHandler: skb len=%u data_len=%u truesize=%u next=%p nr_frags=%u tso_size=%u tso_seqs=%u frag_list=%p pkt_type=%x\n",
451	pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next, skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->tso_size, skb_shinfo(pBuf)->tso_segs, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type));
452	#endif
453	/*
454	* Drop it immediately?
455	*/
456	if (!pBuf)
457	return 0;
458
459	pThis = VBOX_FLT_PT_TO_INST(pPacketType);
460	pDev = (struct net_device )ASMAtomicUoReadPtr((void volatile *)&pThis->u.s.pDev);
461	if (pThis->u.s.pDev != pSkbDev)
462	{
463	Log(("vboxNetFltLinuxPacketHandler: Devices do not match, pThis may be wrong! pThis=%p\n", pThis));
464	return 0;
465	}
466
467	Log4(("vboxNetFltLinuxPacketHandler: pBuf->cb dump:\n%.*Rhxd\n", sizeof(pBuf->cb), pBuf->cb));
468	if (vboxNetFltLinuxSkBufIsOur(pBuf))
469	{
470	Log2(("vboxNetFltLinuxPacketHandler: got our own sk_buff, drop it.\n"));
471	dev_kfree_skb(pBuf);
472	return 0;
473	}
474
475	#ifndef VBOXNETFLT_SG_SUPPORT
476	{
477	/*
478	* Get rid of fragmented packets, they cause too much trouble.
479	*/
480	struct sk_buff *pCopy = skb_copy(pBuf, GFP_ATOMIC);
481	kfree_skb(pBuf);
482	if (!pCopy)
483	{
484	LogRel(("VBoxNetFlt: Failed to allocate packet buffer, dropping the packet.\n"));
485	return 0;
486	}
487	pBuf = pCopy;
488	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18)
489	Log3(("vboxNetFltLinuxPacketHandler: skb copy len=%u data_len=%u truesize=%u next=%p nr_frags=%u gso_size=%u gso_seqs=%u gso_type=%x frag_list=%p pkt_type=%x\n",
490	pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next, skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->gso_size, skb_shinfo(pBuf)->gso_segs, skb_shinfo(pBuf)->gso_type, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type));
491	#else
492	Log3(("vboxNetFltLinuxPacketHandler: skb copy len=%u data_len=%u truesize=%u next=%p nr_frags=%u tso_size=%u tso_seqs=%u frag_list=%p pkt_type=%x\n",
493	pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next, skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->tso_size, skb_shinfo(pBuf)->tso_segs, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type));
494	#endif
495	}
496	#endif
497
498	/* Add the packet to transmit queue and schedule the bottom half. */
499	skb_queue_tail(&pThis->u.s.XmitQueue, pBuf);
500	schedule_work(&pThis->u.s.XmitTask);
501	Log4(("vboxNetFltLinuxPacketHandler: scheduled work %p for sk_buff %p\n",
502	&pThis->u.s.XmitTask, pBuf));
503	/* It does not really matter what we return, it is ignored by the kernel. */
504	return 0;
505	}
506
507	static unsigned vboxNetFltLinuxSGSegments(PVBOXNETFLTINS pThis, struct sk_buff *pBuf)
508	{
509	#ifdef VBOXNETFLT_SG_SUPPORT
510	unsigned cSegs = 1 + skb_shinfo(pBuf)->nr_frags;
511	#else
512	unsigned cSegs = 1;
513	#endif
514	#ifdef PADD_RUNT_FRAMES_FROM_HOST
515	/*
516	* Add a trailer if the frame is too small.
517	*/
518	if (pBuf->len < 60)
519	cSegs++;
520	#endif
521	return cSegs;
522	}
523
524	/* WARNING! This function should only be called after vboxNetFltLinuxSkBufToSG()! */
525	static void vboxNetFltLinuxFreeSkBuff(struct sk_buff *pBuf, PINTNETSG pSG)
526	{
527	#ifdef VBOXNETFLT_SG_SUPPORT
528	int i;
529
530	for (i = 0; i < skb_shinfo(pBuf)->nr_frags; i++)
531	{
532	printk("kunmap(%p)\n", pSG->aSegs[i+1].pv);
533	kunmap(pSG->aSegs[i+1].pv);
534	}
535	#endif
536
537	dev_kfree_skb(pBuf);
538	}
539
540	#ifndef LOG_ENABLED
541	# define vboxNetFltDumpPacket(a, b, c, d) do {} while (0)
542	#else
543	static void vboxNetFltDumpPacket(PINTNETSG pSG, bool fEgress, const char *pszWhere, int iIncrement)
544	{
545	uint8_t pInt, pExt;
546	static int iPacketNo = 1;
547	iPacketNo += iIncrement;
548	if (fEgress)
549	{
550	pExt = pSG->aSegs[0].pv;
551	pInt = pExt + 6;
552	}
553	else
554	{
555	pInt = pSG->aSegs[0].pv;
556	pExt = pInt + 6;
557	}
558	Log(("VBoxNetFlt: (int)%02x:%02x:%02x:%02x:%02x:%02x"
559	" %s (%s)%02x:%02x:%02x:%02x:%02x:%02x (%u bytes) packet #%u\n",
560	pInt[0], pInt[1], pInt[2], pInt[3], pInt[4], pInt[5],
561	fEgress ? "-->" : "<--", pszWhere,
562	pExt[0], pExt[1], pExt[2], pExt[3], pExt[4], pExt[5],
563	pSG->cbTotal, iPacketNo));
564	Log3(("%.*Rhxd\n", pSG->aSegs[0].cb, pSG->aSegs[0].pv));
565	}
566	#endif
567
568	static int vboxNetFltLinuxForwardSegment(PVBOXNETFLTINS pThis, struct sk_buff *pBuf, uint32_t fSrc)
569	{
570	unsigned cSegs = vboxNetFltLinuxSGSegments(pThis, pBuf);
571	if (cSegs < MAX_SKB_FRAGS)
572	{
573	uint8_t *pTmp;
574	PINTNETSG pSG = (PINTNETSG)alloca(RT_OFFSETOF(INTNETSG, aSegs[cSegs]));
575	if (!pSG)
576	{
577	Log(("VBoxNetFlt: Failed to allocate SG buffer.\n"));
578	return VERR_NO_MEMORY;
579	}
580	vboxNetFltLinuxSkBufToSG(pThis, pBuf, pSG, cSegs, fSrc);
581
582	pTmp = pSG->aSegs[0].pv;
583	vboxNetFltDumpPacket(pSG, false, (fSrc & INTNETTRUNKDIR_HOST) ? "host" : "wire", 1);
584	pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, pSG, fSrc);
585	Log4(("VBoxNetFlt: Dropping the sk_buff.\n"));
586	vboxNetFltLinuxFreeSkBuff(pBuf, pSG);
587	}
588
589	return VINF_SUCCESS;
590	}
591
592	static void vboxNetFltLinuxForwardToIntNet(PVBOXNETFLTINS pThis, struct sk_buff *pBuf)
593	{
594	uint32_t fSrc = pBuf->pkt_type == PACKET_OUTGOING ? INTNETTRUNKDIR_HOST : INTNETTRUNKDIR_WIRE;
595
596	if (VBOX_SKB_IS_GSO(pBuf))
597	{
598	/* Need to segment the packet */
599	struct sk_buff pNext, pSegment;
600	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18)
601	Log3(("vboxNetFltLinuxForwardToIntNet: skb len=%u data_len=%u truesize=%u next=%p nr_frags=%u gso_size=%u gso_seqs=%u gso_type=%x frag_list=%p pkt_type=%x ip_summed=%d\n",
602	pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next, skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->gso_size, skb_shinfo(pBuf)->gso_segs, skb_shinfo(pBuf)->gso_type, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type, pBuf->ip_summed));
603	#endif
604
605	pSegment = VBOX_SKB_GSO_SEGMENT(pBuf);
606	if (IS_ERR(pSegment))
607	{
608	dev_kfree_skb(pBuf);
609	LogRel(("VBoxNetFlt: Failed to segment a packet (%d).\n", PTR_ERR(pBuf)));
610	return;
611	}
612	for (; pSegment; pSegment = pNext)
613	{
614	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18)
615	Log3(("vboxNetFltLinuxForwardToIntNet: segment len=%u data_len=%u truesize=%u next=%p nr_frags=%u gso_size=%u gso_seqs=%u gso_type=%x frag_list=%p pkt_type=%x\n",
616	pSegment->len, pSegment->data_len, pSegment->truesize, pSegment->next, skb_shinfo(pSegment)->nr_frags, skb_shinfo(pSegment)->gso_size, skb_shinfo(pSegment)->gso_segs, skb_shinfo(pSegment)->gso_type, skb_shinfo(pSegment)->frag_list, pSegment->pkt_type));
617	#endif
618	pNext = pSegment->next;
619	pSegment->next = 0;
620	vboxNetFltLinuxForwardSegment(pThis, pSegment, fSrc);
621	}
622	dev_kfree_skb(pBuf);
623	}
624	else
625	{
626	if (pBuf->ip_summed == CHECKSUM_PARTIAL && pBuf->pkt_type == PACKET_OUTGOING)
627	{
628	#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18)
629	/*
630	* Try to work around the problem with CentOS 4.7 and 5.2 (2.6.9
631	* and 2.6.18 kernels), they pass wrong 'h' pointer down. We take IP
632	* header length from the header itself and reconstruct 'h' pointer
633	* to TCP (or whatever) header.
634	*/
635	unsigned char *tmp = pBuf->h.raw;
636	if (pBuf->h.raw == pBuf->nh.raw && pBuf->protocol == htons(ETH_P_IP))
637	pBuf->h.raw = pBuf->nh.raw + pBuf->nh.iph->ihl * 4;
638	#endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) */
639	if (VBOX_SKB_CHECKSUM_HELP(pBuf))
640	{
641	LogRel(("VBoxNetFlt: Failed to compute checksum, dropping the packet.\n"));
642	dev_kfree_skb(pBuf);
643	return;
644	}
645	#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18)
646	/* Restore the original (wrong) pointer. */
647	pBuf->h.raw = tmp;
648	#endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) */
649	}
650	vboxNetFltLinuxForwardSegment(pThis, pBuf, fSrc);
651	}
652	/*
653	* Create a (scatter/)gather list for the sk_buff and feed it to the internal network.
654	*/
655	}
656
657	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
658	static void vboxNetFltLinuxXmitTask(struct work_struct *pWork)
659	#else
660	static void vboxNetFltLinuxXmitTask(void *pWork)
661	#endif
662	{
663	struct sk_buff *pBuf;
664	bool fActive;
665	PVBOXNETFLTINS pThis;
666	RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
667
668	Log4(("vboxNetFltLinuxXmitTask: Got work %p.\n", pWork));
669	pThis = VBOX_FLT_XT_TO_INST(pWork);
670	/*
671	* Active? Retain the instance and increment the busy counter.
672	*/
673	RTSpinlockAcquire(pThis->hSpinlock, &Tmp);
674	fActive = ASMAtomicUoReadBool(&pThis->fActive);
675	if (fActive)
676	vboxNetFltRetain(pThis, true /* fBusy */);
677	RTSpinlockRelease(pThis->hSpinlock, &Tmp);
678	if (!fActive)
679	return;
680
681	while ((pBuf = skb_dequeue(&pThis->u.s.XmitQueue)) != 0)
682	vboxNetFltLinuxForwardToIntNet(pThis, pBuf);
683
684	vboxNetFltRelease(pThis, true /* fBusy */);
685	}
686
687	/**
688	* Internal worker for vboxNetFltOsInitInstance and vboxNetFltOsMaybeRediscovered.
689	*
690	* @returns VBox status code.
691	* @param pThis The instance.
692	* @param fRediscovery If set we're doing a rediscovery attempt, so, don't
693	* flood the release log.
694	*/
695	static int vboxNetFltLinuxAttachToInterface(PVBOXNETFLTINS pThis, struct net_device *pDev)
696	{
697	struct packet_type *pt;
698	RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
699
700	LogFlow(("vboxNetFltLinuxAttachToInterface: pThis=%p (%s)\n", pThis, pThis->szName));
701
702	if (!pDev)
703	{
704	Log(("VBoxNetFlt: failed to find device '%s'\n", pThis->szName));
705	return VERR_INTNET_FLT_IF_NOT_FOUND;
706	}
707
708	dev_hold(pDev);
709	RTSpinlockAcquire(pThis->hSpinlock, &Tmp);
710	ASMAtomicUoWritePtr((void * volatile *)&pThis->u.s.pDev, pDev);
711	RTSpinlockRelease(pThis->hSpinlock, &Tmp);
712
713	Log(("vboxNetFltLinuxAttachToInterface: Device %p(%s) retained. ref=%d\n", pDev, pDev->name, atomic_read(&pDev->refcnt)));
714	Log(("vboxNetFltLinuxAttachToInterface: Got pDev=%p pThis=%p pThis->u.s.pDev=%p\n", pDev, pThis, ASMAtomicUoReadPtr((void * volatile *)&pThis->u.s.pDev)));
715	/*
716	* Get the mac address while we still have a valid ifnet reference.
717	*/
718	memcpy(&pThis->u.s.Mac, pDev->dev_addr, sizeof(pThis->u.s.Mac));
719
720	pt = &pThis->u.s.PacketType;
721	pt->type = __constant_htons(ETH_P_ALL);
722	pt->dev = pDev;
723	pt->func = vboxNetFltLinuxPacketHandler;
724	dev_add_pack(pt);
725	RTSpinlockAcquire(pThis->hSpinlock, &Tmp);
726	pDev = (struct net_device )ASMAtomicUoReadPtr((void volatile *)&pThis->u.s.pDev);
727	if (pDev)
728	{
729	ASMAtomicUoWriteBool(&pThis->fDisconnectedFromHost, false);
730	ASMAtomicUoWriteBool(&pThis->u.s.fRegistered, true);
731	pDev = NULL; /* don't dereference it */
732	}
733	RTSpinlockRelease(pThis->hSpinlock, &Tmp);
734	Log(("vboxNetFltLinuxAttachToInterface: this=%p: Packet handler installed.\n", pThis));
735
736	/* Release the interface on failure. */
737	if (pDev)
738	{
739	RTSpinlockAcquire(pThis->hSpinlock, &Tmp);
740	ASMAtomicUoWritePtr((void * volatile *)&pThis->u.s.pDev, NULL);
741	RTSpinlockRelease(pThis->hSpinlock, &Tmp);
742	dev_put(pDev);
743	Log(("vboxNetFltLinuxAttachToInterface: Device %p(%s) released. ref=%d\n", pDev, pDev->name, atomic_read(&pDev->refcnt)));
744	}
745
746	LogRel(("VBoxNetFlt: attached to '%s' / %.*Rhxs\n", pThis->szName, sizeof(pThis->u.s.Mac), &pThis->u.s.Mac));
747	return VINF_SUCCESS;
748	}
749
750
751	static int vboxNetFltLinuxUnregisterDevice(PVBOXNETFLTINS pThis, struct net_device *pDev)
752	{
753	RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
754
755	Assert(!pThis->fDisconnectedFromHost);
756	RTSpinlockAcquire(pThis->hSpinlock, &Tmp);
757	ASMAtomicWriteBool(&pThis->u.s.fRegistered, false);
758	ASMAtomicWriteBool(&pThis->fDisconnectedFromHost, true);
759	ASMAtomicUoWritePtr((void * volatile *)&pThis->u.s.pDev, NULL);
760	RTSpinlockRelease(pThis->hSpinlock, &Tmp);
761
762	dev_remove_pack(&pThis->u.s.PacketType);
763	skb_queue_purge(&pThis->u.s.XmitQueue);
764	Log(("vboxNetFltLinuxUnregisterDevice: this=%p: Packet handler removed, xmit queue purged.\n", pThis));
765	Log(("vboxNetFltLinuxUnregisterDevice: Device %p(%s) released. ref=%d\n", pDev, pDev->name, atomic_read(&pDev->refcnt)));
766	dev_put(pDev);
767
768	return NOTIFY_OK;
769	}
770
771	static int vboxNetFltLinuxDeviceIsUp(PVBOXNETFLTINS pThis, struct net_device *pDev)
772	{
773	/* Check if we are not suspended and promiscuous mode has not been set. */
774	if (ASMAtomicUoReadBool(&pThis->fActive) && !ASMAtomicUoReadBool(&pThis->u.s.fPromiscuousSet))
775	{
776	/* Note that there is no need for locking as the kernel got hold of the lock already. */
777	dev_set_promiscuity(pDev, 1);
778	ASMAtomicWriteBool(&pThis->u.s.fPromiscuousSet, true);
779	Log(("vboxNetFltLinuxDeviceIsUp: enabled promiscuous mode on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pDev)));
780	}
781	else
782	Log(("vboxNetFltLinuxDeviceIsUp: no need to enable promiscuous mode on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pDev)));
783	return NOTIFY_OK;
784	}
785
786	static int vboxNetFltLinuxDeviceGoingDown(PVBOXNETFLTINS pThis, struct net_device *pDev)
787	{
788	/* Undo promiscuous mode if we has set it. */
789	if (ASMAtomicUoReadBool(&pThis->u.s.fPromiscuousSet))
790	{
791	/* Note that there is no need for locking as the kernel got hold of the lock already. */
792	dev_set_promiscuity(pDev, -1);
793	ASMAtomicWriteBool(&pThis->u.s.fPromiscuousSet, false);
794	Log(("vboxNetFltLinuxDeviceGoingDown: disabled promiscuous mode on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pDev)));
795	}
796	else
797	Log(("vboxNetFltLinuxDeviceGoingDown: no need to disable promiscuous mode on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pDev)));
798	return NOTIFY_OK;
799	}
800
801	static int vboxNetFltLinuxNotifierCallback(struct notifier_block self, unsigned long ulEventType, void ptr)
802
803	{
804	int rc = NOTIFY_OK;
805	#ifdef DEBUG
806	char *pszEvent = "<unknown>";
807	#endif
808	struct net_device pDev = (struct net_device )ptr;
809	PVBOXNETFLTINS pThis = VBOX_FLT_NB_TO_INST(self);
810
811	#ifdef DEBUG
812	switch (ulEventType)
813	{
814	case NETDEV_REGISTER: pszEvent = "NETDEV_REGISTER"; break;
815	case NETDEV_UNREGISTER: pszEvent = "NETDEV_UNREGISTER"; break;
816	case NETDEV_UP: pszEvent = "NETDEV_UP"; break;
817	case NETDEV_DOWN: pszEvent = "NETDEV_DOWN"; break;
818	case NETDEV_REBOOT: pszEvent = "NETDEV_REBOOT"; break;
819	case NETDEV_CHANGENAME: pszEvent = "NETDEV_CHANGENAME"; break;
820	case NETDEV_CHANGE: pszEvent = "NETDEV_CHANGE"; break;
821	case NETDEV_CHANGEMTU: pszEvent = "NETDEV_CHANGEMTU"; break;
822	case NETDEV_CHANGEADDR: pszEvent = "NETDEV_CHANGEADDR"; break;
823	case NETDEV_GOING_DOWN: pszEvent = "NETDEV_GOING_DOWN"; break;
824	}
825	Log(("VBoxNetFlt: got event %s(0x%lx) on %s, pDev=%p pThis=%p pThis->u.s.pDev=%p\n",
826	pszEvent, ulEventType, pDev->name, pDev, pThis, ASMAtomicUoReadPtr((void * volatile *)&pThis->u.s.pDev)));
827	#endif
828	if (ulEventType == NETDEV_REGISTER && !strcmp(pDev->name, pThis->szName))
829	{
830	vboxNetFltLinuxAttachToInterface(pThis, pDev);
831	}
832	else
833	{
834	pDev = (struct net_device )ASMAtomicUoReadPtr((void volatile *)&pThis->u.s.pDev);
835	if (pDev != ptr)
836	return NOTIFY_OK;
837	rc = NOTIFY_OK;
838	switch (ulEventType)
839	{
840	case NETDEV_UNREGISTER:
841	rc = vboxNetFltLinuxUnregisterDevice(pThis, pDev);
842	break;
843	case NETDEV_UP:
844	rc = vboxNetFltLinuxDeviceIsUp(pThis, pDev);
845	break;
846	case NETDEV_GOING_DOWN:
847	rc = vboxNetFltLinuxDeviceGoingDown(pThis, pDev);
848	break;
849	case NETDEV_CHANGENAME:
850	break;
851	}
852	}
853
854	return rc;
855	}
856
857	bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis)
858	{
859	return !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
860	}
861
862	int vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, PINTNETSG pSG, uint32_t fDst)
863	{
864	struct net_device * pDev;
865	int err;
866	int rc = VINF_SUCCESS;
867
868	LogFlow(("vboxNetFltPortOsXmit: pThis=%p (%s)\n", pThis, pThis->szName));
869
870	pDev = vboxNetFltLinuxRetainNetDev(pThis);
871	if (pDev)
872	{
873	/*
874	* Create a sk_buff for the gather list and push it onto the wire.
875	*/
876	if (fDst & INTNETTRUNKDIR_WIRE)
877	{
878	struct sk_buff *pBuf = vboxNetFltLinuxSkBufFromSG(pThis, pSG, true);
879	if (pBuf)
880	{
881	vboxNetFltDumpPacket(pSG, true, "wire", 1);
882	Log4(("vboxNetFltPortOsXmit: pBuf->cb dump:\n%.*Rhxd\n", sizeof(pBuf->cb), pBuf->cb));
883	Log4(("vboxNetFltPortOsXmit: dev_queue_xmit(%p)\n", pBuf));
884	err = dev_queue_xmit(pBuf);
885	if (err)
886	rc = RTErrConvertFromErrno(err);
887	}
888	else
889	rc = VERR_NO_MEMORY;
890	}
891
892	/*
893	* Create a sk_buff for the gather list and push it onto the host stack.
894	*/
895	if (fDst & INTNETTRUNKDIR_HOST)
896	{
897	struct sk_buff *pBuf = vboxNetFltLinuxSkBufFromSG(pThis, pSG, false);
898	if (pBuf)
899	{
900	vboxNetFltDumpPacket(pSG, true, "host", (fDst & INTNETTRUNKDIR_WIRE) ? 0 : 1);
901	Log4(("vboxNetFltPortOsXmit: pBuf->cb dump:\n%.*Rhxd\n", sizeof(pBuf->cb), pBuf->cb));
902	Log4(("vboxNetFltPortOsXmit: netif_rx_ni(%p)\n", pBuf));
903	err = netif_rx_ni(pBuf);
904	if (err)
905	rc = RTErrConvertFromErrno(err);
906	}
907	else
908	rc = VERR_NO_MEMORY;
909	}
910
911	vboxNetFltLinuxReleaseNetDev(pThis, pDev);
912	}
913
914	return rc;
915	}
916
917
918	bool vboxNetFltPortOsIsPromiscuous(PVBOXNETFLTINS pThis)
919	{
920	bool fRc = false;
921	struct net_device * pDev = vboxNetFltLinuxRetainNetDev(pThis);
922	if (pDev)
923	{
924	fRc = !!(pDev->promiscuity - (ASMAtomicUoReadBool(&pThis->u.s.fPromiscuousSet) & 1));
925	LogFlow(("vboxNetFltPortOsIsPromiscuous: returns %d, pDev->promiscuity=%d, fPromiscuousSet=%d\n",
926	fRc, pDev->promiscuity, pThis->u.s.fPromiscuousSet));
927	vboxNetFltLinuxReleaseNetDev(pThis, pDev);
928	}
929	return fRc;
930	}
931
932
933	void vboxNetFltPortOsGetMacAddress(PVBOXNETFLTINS pThis, PRTMAC pMac)
934	{
935	*pMac = pThis->u.s.Mac;
936	}
937
938
939	bool vboxNetFltPortOsIsHostMac(PVBOXNETFLTINS pThis, PCRTMAC pMac)
940	{
941	/* ASSUMES that the MAC address never changes. */
942	return pThis->u.s.Mac.au16[0] == pMac->au16[0]
943	&& pThis->u.s.Mac.au16[1] == pMac->au16[1]
944	&& pThis->u.s.Mac.au16[2] == pMac->au16[2];
945	}
946
947
948	void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive)
949	{
950	struct net_device * pDev;
951
952	LogFlow(("vboxNetFltPortOsSetActive: pThis=%p (%s), fActive=%s, fDisablePromiscuous=%s\n",
953	pThis, pThis->szName, fActive?"true":"false",
954	pThis->fDisablePromiscuous?"true":"false"));
955
956	if (pThis->fDisablePromiscuous)
957	return;
958
959	pDev = vboxNetFltLinuxRetainNetDev(pThis);
960	if (pDev)
961	{
962	/*
963	* This api is a bit weird, the best reference is the code.
964	*
965	* Also, we have a bit or race conditions wrt the maintance of
966	* host the interface promiscuity for vboxNetFltPortOsIsPromiscuous.
967	*/
968	#ifdef LOG_ENABLED
969	u_int16_t fIf;
970	unsigned const cPromiscBefore = VBOX_GET_PCOUNT(pDev);
971	#endif
972	if (fActive)
973	{
974	Assert(!pThis->u.s.fPromiscuousSet);
975
976	rtnl_lock();
977	dev_set_promiscuity(pDev, 1);
978	rtnl_unlock();
979	pThis->u.s.fPromiscuousSet = true;
980	Log(("vboxNetFltPortOsSetActive: enabled promiscuous mode on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pDev)));
981	}
982	else
983	{
984	if (pThis->u.s.fPromiscuousSet)
985	{
986	rtnl_lock();
987	dev_set_promiscuity(pDev, -1);
988	rtnl_unlock();
989	Log(("vboxNetFltPortOsSetActive: disabled promiscuous mode on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pDev)));
990	}
991	pThis->u.s.fPromiscuousSet = false;
992
993	#ifdef LOG_ENABLED
994	fIf = dev_get_flags(pDev);
995	Log(("VBoxNetFlt: fIf=%#x; %d->%d\n", fIf, cPromiscBefore, VBOX_GET_PCOUNT(pDev)));
996	#endif
997	}
998
999	vboxNetFltLinuxReleaseNetDev(pThis, pDev);
1000	}
1001	}
1002
1003
1004	int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis)
1005	{
1006	/* Nothing to do here. */
1007	return VINF_SUCCESS;
1008	}
1009
1010
1011	int vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis)
1012	{
1013	/* Nothing to do here. */
1014	return VINF_SUCCESS;
1015	}
1016
1017
1018	void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis)
1019	{
1020	struct net_device *pDev;
1021	bool fRegistered;
1022	RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER;
1023
1024	RTSpinlockAcquire(pThis->hSpinlock, &Tmp);
1025	pDev = (struct net_device )ASMAtomicUoReadPtr((void volatile *)&pThis->u.s.pDev);
1026	fRegistered = ASMAtomicUoReadBool(&pThis->u.s.fRegistered);
1027	RTSpinlockRelease(pThis->hSpinlock, &Tmp);
1028	if (fRegistered)
1029	{
1030	dev_remove_pack(&pThis->u.s.PacketType);
1031	skb_queue_purge(&pThis->u.s.XmitQueue);
1032	Log(("vboxNetFltOsDeleteInstance: this=%p: Packet handler removed, xmit queue purged.\n", pThis));
1033	Log(("vboxNetFltOsDeleteInstance: Device %p(%s) released. ref=%d\n", pDev, pDev->name, atomic_read(&pDev->refcnt)));
1034	dev_put(pDev);
1035	}
1036	Log(("vboxNetFltOsDeleteInstance: this=%p: Notifier removed.\n", pThis));
1037	unregister_netdevice_notifier(&pThis->u.s.Notifier);
1038	module_put(THIS_MODULE);
1039	}
1040
1041
1042	int vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext)
1043	{
1044	int err;
1045	NOREF(pvContext);
1046
1047	pThis->u.s.Notifier.notifier_call = vboxNetFltLinuxNotifierCallback;
1048	err = register_netdevice_notifier(&pThis->u.s.Notifier);
1049	if (err)
1050	return VERR_INTNET_FLT_IF_FAILED;
1051	if (!pThis->u.s.fRegistered)
1052	{
1053	unregister_netdevice_notifier(&pThis->u.s.Notifier);
1054	LogRel(("VBoxNetFlt: failed to find %s.\n", pThis->szName));
1055	return VERR_INTNET_FLT_IF_NOT_FOUND;
1056	}
1057
1058	Log(("vboxNetFltOsInitInstance: this=%p: Notifier installed.\n", pThis));
1059	if ( pThis->fDisconnectedFromHost
1060	\|\| !try_module_get(THIS_MODULE))
1061	return VERR_INTNET_FLT_IF_FAILED;
1062
1063	return VINF_SUCCESS;
1064	}
1065
1066	int vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis)
1067	{
1068	/*
1069	* Init the linux specific members.
1070	*/
1071	pThis->u.s.pDev = NULL;
1072	pThis->u.s.fRegistered = false;
1073	pThis->u.s.fPromiscuousSet = false;
1074	memset(&pThis->u.s.PacketType, 0, sizeof(pThis->u.s.PacketType));
1075	skb_queue_head_init(&pThis->u.s.XmitQueue);
1076	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
1077	INIT_WORK(&pThis->u.s.XmitTask, vboxNetFltLinuxXmitTask);
1078	#else
1079	INIT_WORK(&pThis->u.s.XmitTask, vboxNetFltLinuxXmitTask, &pThis->u.s.XmitTask);
1080	#endif
1081
1082	return VINF_SUCCESS;
1083	}
1084

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source: vbox/trunk/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c@ 28112

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