VirtualBox

source: vbox/trunk/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c@ 69250

Last change on this file since 69250 was 69250, checked in by vboxsync, 7 years ago

HostDrivers: scm updates
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1/* $Id: VBoxNetFlt-linux.c 69250 2017-10-24 19:18:49Z vboxsync $ */
2/** @file
3 * VBoxNetFlt - Network Filter Driver (Host), Linux Specific Code.
4 */
5
6/*
7 * Copyright (C) 2006-2016 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 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
32#define VBOXNETFLT_LINUX_NO_XMIT_QUEUE
33#include "the-linux-kernel.h"
34#include "version-generated.h"
35#include "revision-generated.h"
36#include "product-generated.h"
37#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)
38#include <linux/nsproxy.h>
39#endif
40#include <linux/netdevice.h>
41#include <linux/etherdevice.h>
42#include <linux/rtnetlink.h>
43#include <linux/miscdevice.h>
44#include <linux/inetdevice.h>
45#include <linux/in.h>
46#include <linux/ip.h>
47#include <linux/if_vlan.h>
48#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)
49#include <uapi/linux/pkt_cls.h>
50#endif
51#include <net/ipv6.h>
52#include <net/if_inet6.h>
53#include <net/addrconf.h>
54
55#include <VBox/log.h>
56#include <VBox/err.h>
57#include <VBox/intnetinline.h>
58#include <VBox/vmm/pdmnetinline.h>
59#include <VBox/param.h>
60#include <iprt/alloca.h>
61#include <iprt/assert.h>
62#include <iprt/spinlock.h>
63#include <iprt/semaphore.h>
64#include <iprt/initterm.h>
65#include <iprt/process.h>
66#include <iprt/mem.h>
67#include <iprt/net.h>
68#include <iprt/log.h>
69#include <iprt/mp.h>
70#include <iprt/mem.h>
71#include <iprt/time.h>
72
73#define VBOXNETFLT_OS_SPECFIC 1
74#include "../VBoxNetFltInternal.h"
75
76typedef struct VBOXNETFLTNOTIFIER {
77 struct notifier_block Notifier;
78 PVBOXNETFLTINS pThis;
79} VBOXNETFLTNOTIFIER;
80typedef struct VBOXNETFLTNOTIFIER *PVBOXNETFLTNOTIFIER;
81
82
83/*********************************************************************************************************************************
84* Defined Constants And Macros *
85*********************************************************************************************************************************/
86#define VBOX_FLT_NB_TO_INST(pNB) RT_FROM_MEMBER(pNB, VBOXNETFLTINS, u.s.Notifier)
87#define VBOX_FLT_PT_TO_INST(pPT) RT_FROM_MEMBER(pPT, VBOXNETFLTINS, u.s.PacketType)
88#ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
89# define VBOX_FLT_XT_TO_INST(pXT) RT_FROM_MEMBER(pXT, VBOXNETFLTINS, u.s.XmitTask)
90#endif
91
92#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
93# define VBOX_NETDEV_NOTIFIER_INFO_TO_DEV(ptr) netdev_notifier_info_to_dev(ptr)
94#else
95# define VBOX_NETDEV_NOTIFIER_INFO_TO_DEV(ptr) ((struct net_device *)ptr)
96#endif
97
98#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
99# define VBOX_SKB_KMAP_FRAG(frag) kmap_atomic(skb_frag_page(frag))
100# define VBOX_SKB_KUNMAP_FRAG(vaddr) kunmap_atomic(vaddr)
101#else
102# if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0)
103# define VBOX_SKB_KMAP_FRAG(frag) kmap_atomic(skb_frag_page(frag), KM_SKB_DATA_SOFTIRQ)
104# define VBOX_SKB_KUNMAP_FRAG(vaddr) kunmap_atomic(vaddr, KM_SKB_DATA_SOFTIRQ)
105# else
106# define VBOX_SKB_KMAP_FRAG(frag) kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
107# define VBOX_SKB_KUNMAP_FRAG(vaddr) kunmap_atomic(vaddr, KM_SKB_DATA_SOFTIRQ)
108# endif
109#endif
110
111#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 34)
112# define VBOX_NETDEV_NAME(dev) netdev_name(dev)
113#else
114# define VBOX_NETDEV_NAME(dev) ((dev)->reg_state != NETREG_REGISTERED ? "(unregistered net_device)" : (dev)->name)
115#endif
116
117#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
118# define VBOX_IPV4_IS_LOOPBACK(addr) ipv4_is_loopback(addr)
119# define VBOX_IPV4_IS_LINKLOCAL_169(addr) ipv4_is_linklocal_169(addr)
120#else
121# define VBOX_IPV4_IS_LOOPBACK(addr) ((addr & htonl(IN_CLASSA_NET)) == htonl(0x7f000000))
122# define VBOX_IPV4_IS_LINKLOCAL_169(addr) ((addr & htonl(IN_CLASSB_NET)) == htonl(0xa9fe0000))
123#endif
124
125#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22)
126# define VBOX_SKB_RESET_NETWORK_HDR(skb) skb_reset_network_header(skb)
127# define VBOX_SKB_RESET_MAC_HDR(skb) skb_reset_mac_header(skb)
128# define VBOX_SKB_CSUM_OFFSET(skb) skb->csum_offset
129#else
130# define VBOX_SKB_RESET_NETWORK_HDR(skb) skb->nh.raw = skb->data
131# define VBOX_SKB_RESET_MAC_HDR(skb) skb->mac.raw = skb->data
132# define VBOX_SKB_CSUM_OFFSET(skb) skb->csum
133#endif
134
135#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
136# define VBOX_SKB_CHECKSUM_HELP(skb) skb_checksum_help(skb)
137#else
138# define CHECKSUM_PARTIAL CHECKSUM_HW
139# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10)
140# define VBOX_SKB_CHECKSUM_HELP(skb) skb_checksum_help(skb, 0)
141# else
142# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 7)
143# define VBOX_SKB_CHECKSUM_HELP(skb) skb_checksum_help(&skb, 0)
144# else
145# define VBOX_SKB_CHECKSUM_HELP(skb) (!skb_checksum_help(skb))
146# endif
147/* Versions prior 2.6.10 use stats for both bstats and qstats */
148# define bstats stats
149# define qstats stats
150# endif
151#endif
152
153#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 20, 0)
154# define VBOX_HAVE_SKB_VLAN
155#else
156# ifdef RHEL_RELEASE_CODE
157# if (RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(7, 2) && RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(8, 0)) || \
158 (RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(6, 8) && RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(7, 0))
159# define VBOX_HAVE_SKB_VLAN
160# endif
161# endif
162#endif
163
164#ifdef VBOX_HAVE_SKB_VLAN
165# define vlan_tx_tag_get(skb) skb_vlan_tag_get(skb)
166# define vlan_tx_tag_present(skb) skb_vlan_tag_present(skb)
167#endif
168
169#ifndef NET_IP_ALIGN
170# define NET_IP_ALIGN 2
171#endif
172
173#if 1
174/** Create scatter / gather segments for fragments. When not used, we will
175 * linearize the socket buffer before creating the internal networking SG. */
176# define VBOXNETFLT_SG_SUPPORT 1
177#endif
178
179#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18)
180
181/** Indicates that the linux kernel may send us GSO frames. */
182# define VBOXNETFLT_WITH_GSO 1
183
184/** This enables or disables the transmitting of GSO frame from the internal
185 * network and to the host. */
186# define VBOXNETFLT_WITH_GSO_XMIT_HOST 1
187
188# if 0 /** @todo This is currently disable because it causes performance loss of 5-10%. */
189/** This enables or disables the transmitting of GSO frame from the internal
190 * network and to the wire. */
191# define VBOXNETFLT_WITH_GSO_XMIT_WIRE 1
192# endif
193
194/** This enables or disables the forwarding/flooding of GSO frame from the host
195 * to the internal network. */
196# define VBOXNETFLT_WITH_GSO_RECV 1
197
198#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18) */
199
200#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
201/** This enables or disables handling of GSO frames coming from the wire (GRO). */
202# define VBOXNETFLT_WITH_GRO 1
203#endif
204
205/*
206 * GRO support was backported to RHEL 5.4
207 */
208#ifdef RHEL_RELEASE_CODE
209# if RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(5, 4)
210# define VBOXNETFLT_WITH_GRO 1
211# endif
212#endif
213
214
215/*********************************************************************************************************************************
216* Internal Functions *
217*********************************************************************************************************************************/
218static int VBoxNetFltLinuxInit(void);
219static void VBoxNetFltLinuxUnload(void);
220static void vboxNetFltLinuxForwardToIntNet(PVBOXNETFLTINS pThis, struct sk_buff *pBuf);
221
222
223/*********************************************************************************************************************************
224* Global Variables *
225*********************************************************************************************************************************/
226/**
227 * The (common) global data.
228 */
229static VBOXNETFLTGLOBALS g_VBoxNetFltGlobals;
230
231module_init(VBoxNetFltLinuxInit);
232module_exit(VBoxNetFltLinuxUnload);
233
234MODULE_AUTHOR(VBOX_VENDOR);
235MODULE_DESCRIPTION(VBOX_PRODUCT " Network Filter Driver");
236MODULE_LICENSE("GPL");
237#ifdef MODULE_VERSION
238MODULE_VERSION(VBOX_VERSION_STRING " r" RT_XSTR(VBOX_SVN_REV) " (" RT_XSTR(INTNETTRUNKIFPORT_VERSION) ")");
239#endif
240
241
242#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 12) && defined(LOG_ENABLED)
243unsigned dev_get_flags(const struct net_device *dev)
244{
245 unsigned flags;
246
247 flags = (dev->flags & ~(IFF_PROMISC |
248 IFF_ALLMULTI |
249 IFF_RUNNING)) |
250 (dev->gflags & (IFF_PROMISC |
251 IFF_ALLMULTI));
252
253 if (netif_running(dev) && netif_carrier_ok(dev))
254 flags |= IFF_RUNNING;
255
256 return flags;
257}
258#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 12) */
259
260
261/**
262 * Initialize module.
263 *
264 * @returns appropriate status code.
265 */
266static int __init VBoxNetFltLinuxInit(void)
267{
268 int rc;
269 /*
270 * Initialize IPRT.
271 */
272 rc = RTR0Init(0);
273 if (RT_SUCCESS(rc))
274 {
275 Log(("VBoxNetFltLinuxInit\n"));
276
277 /*
278 * Initialize the globals and connect to the support driver.
279 *
280 * This will call back vboxNetFltOsOpenSupDrv (and maybe vboxNetFltOsCloseSupDrv)
281 * for establishing the connect to the support driver.
282 */
283 memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
284 rc = vboxNetFltInitGlobalsAndIdc(&g_VBoxNetFltGlobals);
285 if (RT_SUCCESS(rc))
286 {
287 LogRel(("VBoxNetFlt: Successfully started.\n"));
288 return 0;
289 }
290
291 LogRel(("VBoxNetFlt: failed to initialize device extension (rc=%d)\n", rc));
292 RTR0Term();
293 }
294 else
295 LogRel(("VBoxNetFlt: failed to initialize IPRT (rc=%d)\n", rc));
296
297 memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
298 return -RTErrConvertToErrno(rc);
299}
300
301
302/**
303 * Unload the module.
304 *
305 * @todo We have to prevent this if we're busy!
306 */
307static void __exit VBoxNetFltLinuxUnload(void)
308{
309 int rc;
310 Log(("VBoxNetFltLinuxUnload\n"));
311 Assert(vboxNetFltCanUnload(&g_VBoxNetFltGlobals));
312
313 /*
314 * Undo the work done during start (in reverse order).
315 */
316 rc = vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltGlobals);
317 AssertRC(rc); NOREF(rc);
318
319 RTR0Term();
320
321 memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
322
323 Log(("VBoxNetFltLinuxUnload - done\n"));
324}
325
326
327/**
328 * We filter traffic from the host to the internal network
329 * before it reaches the NIC driver.
330 *
331 * The current code uses a very ugly hack overriding hard_start_xmit
332 * callback in the device structure, but it has been shown to give us a
333 * performance boost of 60-100% though. Eventually we have to find some
334 * less hacky way of getting this job done.
335 */
336#define VBOXNETFLT_WITH_HOST2WIRE_FILTER
337
338#ifdef VBOXNETFLT_WITH_HOST2WIRE_FILTER
339
340# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
341
342# include <linux/ethtool.h>
343
344typedef struct ethtool_ops OVR_OPSTYPE;
345# define OVR_OPS ethtool_ops
346# define OVR_XMIT pfnStartXmit
347
348# else /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29) */
349
350typedef struct net_device_ops OVR_OPSTYPE;
351# define OVR_OPS netdev_ops
352# define OVR_XMIT pOrgOps->ndo_start_xmit
353
354# endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29) */
355
356/**
357 * The overridden net_device_ops of the device we're attached to.
358 *
359 * As there is no net_device_ops structure in pre-2.6.29 kernels we override
360 * ethtool_ops instead along with hard_start_xmit callback in net_device
361 * structure.
362 *
363 * This is a very dirty hack that was created to explore how much we can improve
364 * the host to guest transfers by not CC'ing the NIC. It turns out to be
365 * the only way to filter outgoing packets for devices without TX queue.
366 */
367typedef struct VBoxNetDeviceOpsOverride
368{
369 /** Our overridden ops. */
370 OVR_OPSTYPE Ops;
371 /** Magic word. */
372 uint32_t u32Magic;
373 /** Pointer to the original ops. */
374 OVR_OPSTYPE const *pOrgOps;
375# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
376 /** Pointer to the original hard_start_xmit function. */
377 int (*pfnStartXmit)(struct sk_buff *pSkb, struct net_device *pDev);
378# endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29) */
379 /** Pointer to the net filter instance. */
380 PVBOXNETFLTINS pVBoxNetFlt;
381 /** The number of filtered packages. */
382 uint64_t cFiltered;
383 /** The total number of packets */
384 uint64_t cTotal;
385} VBOXNETDEVICEOPSOVERRIDE, *PVBOXNETDEVICEOPSOVERRIDE;
386/** VBOXNETDEVICEOPSOVERRIDE::u32Magic value. */
387#define VBOXNETDEVICEOPSOVERRIDE_MAGIC UINT32_C(0x00c0ffee)
388
389/**
390 * ndo_start_xmit wrapper that drops packets that shouldn't go to the wire
391 * because they belong on the internal network.
392 *
393 * @returns NETDEV_TX_XXX.
394 * @param pSkb The socket buffer to transmit.
395 * @param pDev The net device.
396 */
397static int vboxNetFltLinuxStartXmitFilter(struct sk_buff *pSkb, struct net_device *pDev)
398{
399 PVBOXNETDEVICEOPSOVERRIDE pOverride = (PVBOXNETDEVICEOPSOVERRIDE)pDev->OVR_OPS;
400 uint8_t abHdrBuf[sizeof(RTNETETHERHDR) + sizeof(uint32_t) + RTNETIPV4_MIN_LEN];
401 PCRTNETETHERHDR pEtherHdr;
402 PINTNETTRUNKSWPORT pSwitchPort;
403 uint32_t cbHdrs;
404
405
406 /*
407 * Validate the override structure.
408 *
409 * Note! We're racing vboxNetFltLinuxUnhookDev here. If this was supposed
410 * to be production quality code, we would have to be much more
411 * careful here and avoid the race.
412 */
413 if ( !VALID_PTR(pOverride)
414 || pOverride->u32Magic != VBOXNETDEVICEOPSOVERRIDE_MAGIC
415# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
416 || !VALID_PTR(pOverride->pOrgOps)
417# endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29) */
418 )
419 {
420 printk("vboxNetFltLinuxStartXmitFilter: bad override %p\n", pOverride);
421 dev_kfree_skb(pSkb);
422 return NETDEV_TX_OK;
423 }
424 pOverride->cTotal++;
425
426 /*
427 * Do the filtering base on the default OUI of our virtual NICs
428 *
429 * Note! In a real solution, we would ask the switch whether the
430 * destination MAC is 100% to be on the internal network and then
431 * drop it.
432 */
433 cbHdrs = skb_headlen(pSkb);
434 cbHdrs = RT_MIN(cbHdrs, sizeof(abHdrBuf));
435 pEtherHdr = (PCRTNETETHERHDR)skb_header_pointer(pSkb, 0, cbHdrs, &abHdrBuf[0]);
436 if ( pEtherHdr
437 && VALID_PTR(pOverride->pVBoxNetFlt)
438 && (pSwitchPort = pOverride->pVBoxNetFlt->pSwitchPort) != NULL
439 && VALID_PTR(pSwitchPort)
440 && cbHdrs >= 6)
441 {
442 INTNETSWDECISION enmDecision;
443
444 /** @todo consider reference counting, etc. */
445 enmDecision = pSwitchPort->pfnPreRecv(pSwitchPort, pEtherHdr, cbHdrs, INTNETTRUNKDIR_HOST);
446 if (enmDecision == INTNETSWDECISION_INTNET)
447 {
448 dev_kfree_skb(pSkb);
449 pOverride->cFiltered++;
450 return NETDEV_TX_OK;
451 }
452 }
453
454 return pOverride->OVR_XMIT(pSkb, pDev);
455}
456
457/**
458 * Hooks the device ndo_start_xmit operation of the device.
459 *
460 * @param pThis The net filter instance.
461 * @param pDev The net device.
462 */
463static void vboxNetFltLinuxHookDev(PVBOXNETFLTINS pThis, struct net_device *pDev)
464{
465 PVBOXNETDEVICEOPSOVERRIDE pOverride;
466
467 /* Cancel override if ethtool_ops is missing (host-only case, @bugref{5712}) */
468 if (!VALID_PTR(pDev->OVR_OPS))
469 return;
470 pOverride = RTMemAlloc(sizeof(*pOverride));
471 if (!pOverride)
472 return;
473 pOverride->pOrgOps = pDev->OVR_OPS;
474 pOverride->Ops = *pDev->OVR_OPS;
475# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
476 pOverride->pfnStartXmit = pDev->hard_start_xmit;
477# else /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29) */
478 pOverride->Ops.ndo_start_xmit = vboxNetFltLinuxStartXmitFilter;
479# endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29) */
480 pOverride->u32Magic = VBOXNETDEVICEOPSOVERRIDE_MAGIC;
481 pOverride->cTotal = 0;
482 pOverride->cFiltered = 0;
483 pOverride->pVBoxNetFlt = pThis;
484
485 RTSpinlockAcquire(pThis->hSpinlock); /* (this isn't necessary, but so what) */
486 ASMAtomicWritePtr((void * volatile *)&pDev->OVR_OPS, pOverride);
487# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
488 ASMAtomicXchgPtr((void * volatile *)&pDev->hard_start_xmit, vboxNetFltLinuxStartXmitFilter);
489# endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29) */
490 RTSpinlockRelease(pThis->hSpinlock);
491}
492
493/**
494 * Undos what vboxNetFltLinuxHookDev did.
495 *
496 * @param pThis The net filter instance.
497 * @param pDev The net device. Can be NULL, in which case
498 * we'll try retrieve it from @a pThis.
499 */
500static void vboxNetFltLinuxUnhookDev(PVBOXNETFLTINS pThis, struct net_device *pDev)
501{
502 PVBOXNETDEVICEOPSOVERRIDE pOverride;
503
504 RTSpinlockAcquire(pThis->hSpinlock);
505 if (!pDev)
506 pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
507 if (VALID_PTR(pDev))
508 {
509 pOverride = (PVBOXNETDEVICEOPSOVERRIDE)pDev->OVR_OPS;
510 if ( VALID_PTR(pOverride)
511 && pOverride->u32Magic == VBOXNETDEVICEOPSOVERRIDE_MAGIC
512 && VALID_PTR(pOverride->pOrgOps)
513 )
514 {
515# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
516 ASMAtomicWritePtr((void * volatile *)&pDev->hard_start_xmit, pOverride->pfnStartXmit);
517# endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29) */
518 ASMAtomicWritePtr((void const * volatile *)&pDev->OVR_OPS, pOverride->pOrgOps);
519 ASMAtomicWriteU32(&pOverride->u32Magic, 0);
520 }
521 else
522 pOverride = NULL;
523 }
524 else
525 pOverride = NULL;
526 RTSpinlockRelease(pThis->hSpinlock);
527
528 if (pOverride)
529 {
530 printk("vboxnetflt: %llu out of %llu packets were not sent (directed to host)\n", pOverride->cFiltered, pOverride->cTotal);
531 RTMemFree(pOverride);
532 }
533}
534
535#endif /* VBOXNETFLT_WITH_HOST2WIRE_FILTER */
536
537
538/**
539 * Reads and retains the host interface handle.
540 *
541 * @returns The handle, NULL if detached.
542 * @param pThis
543 */
544DECLINLINE(struct net_device *) vboxNetFltLinuxRetainNetDev(PVBOXNETFLTINS pThis)
545{
546#if 0
547 struct net_device *pDev = NULL;
548
549 Log(("vboxNetFltLinuxRetainNetDev\n"));
550 /*
551 * Be careful here to avoid problems racing the detached callback.
552 */
553 RTSpinlockAcquire(pThis->hSpinlock);
554 if (!ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost))
555 {
556 pDev = (struct net_device *)ASMAtomicUoReadPtr((void * volatile *)&pThis->u.s.pDev);
557 if (pDev)
558 {
559 dev_hold(pDev);
560 Log(("vboxNetFltLinuxRetainNetDev: Device %p(%s) retained. ref=%d\n",
561 pDev, pDev->name,
562#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
563 netdev_refcnt_read(pDev)
564#else
565 atomic_read(&pDev->refcnt)
566#endif
567 ));
568 }
569 }
570 RTSpinlockRelease(pThis->hSpinlock);
571
572 Log(("vboxNetFltLinuxRetainNetDev - done\n"));
573 return pDev;
574#else
575 return ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
576#endif
577}
578
579
580/**
581 * Release the host interface handle previously retained
582 * by vboxNetFltLinuxRetainNetDev.
583 *
584 * @param pThis The instance.
585 * @param pDev The vboxNetFltLinuxRetainNetDev
586 * return value, NULL is fine.
587 */
588DECLINLINE(void) vboxNetFltLinuxReleaseNetDev(PVBOXNETFLTINS pThis, struct net_device *pDev)
589{
590#if 0
591 Log(("vboxNetFltLinuxReleaseNetDev\n"));
592 NOREF(pThis);
593 if (pDev)
594 {
595 dev_put(pDev);
596 Log(("vboxNetFltLinuxReleaseNetDev: Device %p(%s) released. ref=%d\n",
597 pDev, pDev->name,
598#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
599 netdev_refcnt_read(pDev)
600#else
601 atomic_read(&pDev->refcnt)
602#endif
603 ));
604 }
605 Log(("vboxNetFltLinuxReleaseNetDev - done\n"));
606#endif
607}
608
609#define VBOXNETFLT_CB_TAG(skb) (0xA1C90000 | (skb->dev->ifindex & 0xFFFF))
610#define VBOXNETFLT_SKB_TAG(skb) (*(uint32_t*)&((skb)->cb[sizeof((skb)->cb)-sizeof(uint32_t)]))
611
612/**
613 * Checks whether this is an mbuf created by vboxNetFltLinuxMBufFromSG,
614 * i.e. a buffer which we're pushing and should be ignored by the filter callbacks.
615 *
616 * @returns true / false accordingly.
617 * @param pBuf The sk_buff.
618 */
619DECLINLINE(bool) vboxNetFltLinuxSkBufIsOur(struct sk_buff *pBuf)
620{
621 return VBOXNETFLT_SKB_TAG(pBuf) == VBOXNETFLT_CB_TAG(pBuf);
622}
623
624
625/**
626 * Checks whether this SG list contains a GSO packet.
627 *
628 * @returns true / false accordingly.
629 * @param pSG The (scatter/)gather list.
630 */
631DECLINLINE(bool) vboxNetFltLinuxIsGso(PINTNETSG pSG)
632{
633#if defined(VBOXNETFLT_WITH_GSO_XMIT_WIRE) || defined(VBOXNETFLT_WITH_GSO_XMIT_HOST)
634 return !((PDMNETWORKGSOTYPE)pSG->GsoCtx.u8Type == PDMNETWORKGSOTYPE_INVALID);
635#else /* !VBOXNETFLT_WITH_GSO_XMIT_WIRE && !VBOXNETFLT_WITH_GSO_XMIT_HOST */
636 return false;
637#endif /* !VBOXNETFLT_WITH_GSO_XMIT_WIRE && !VBOXNETFLT_WITH_GSO_XMIT_HOST */
638}
639
640
641/**
642 * Find out the frame size (of a single segment in case of GSO frames).
643 *
644 * @returns the frame size.
645 * @param pSG The (scatter/)gather list.
646 */
647DECLINLINE(uint32_t) vboxNetFltLinuxFrameSize(PINTNETSG pSG)
648{
649 uint16_t u16Type = 0;
650 uint32_t cbVlanTag = 0;
651 if (pSG->aSegs[0].cb >= sizeof(RTNETETHERHDR))
652 u16Type = RT_BE2H_U16(((PCRTNETETHERHDR)pSG->aSegs[0].pv)->EtherType);
653 else if (pSG->cbTotal >= sizeof(RTNETETHERHDR))
654 {
655 uint32_t off = RT_OFFSETOF(RTNETETHERHDR, EtherType);
656 uint32_t i;
657 for (i = 0; i < pSG->cSegsUsed; ++i)
658 {
659 if (off <= pSG->aSegs[i].cb)
660 {
661 if (off + sizeof(uint16_t) <= pSG->aSegs[i].cb)
662 u16Type = RT_BE2H_U16(*(uint16_t *)((uintptr_t)pSG->aSegs[i].pv + off));
663 else if (i + 1 < pSG->cSegsUsed)
664 u16Type = RT_BE2H_U16( ((uint16_t)( ((uint8_t *)pSG->aSegs[i].pv)[off] ) << 8)
665 + *(uint8_t *)pSG->aSegs[i + 1].pv); /* ASSUMES no empty segments! */
666 /* else: frame is too short. */
667 break;
668 }
669 off -= pSG->aSegs[i].cb;
670 }
671 }
672 if (u16Type == RTNET_ETHERTYPE_VLAN)
673 cbVlanTag = 4;
674 return (vboxNetFltLinuxIsGso(pSG) ? (uint32_t)pSG->GsoCtx.cbMaxSeg + pSG->GsoCtx.cbHdrsTotal : pSG->cbTotal) - cbVlanTag;
675}
676
677
678/**
679 * Internal worker that create a linux sk_buff for a
680 * (scatter/)gather list.
681 *
682 * @returns Pointer to the sk_buff.
683 * @param pThis The instance.
684 * @param pSG The (scatter/)gather list.
685 * @param fDstWire Set if the destination is the wire.
686 */
687static struct sk_buff *vboxNetFltLinuxSkBufFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG, bool fDstWire)
688{
689 struct sk_buff *pPkt;
690 struct net_device *pDev;
691 unsigned fGsoType = 0;
692
693 if (pSG->cbTotal == 0)
694 {
695 LogRel(("VBoxNetFlt: Dropped empty packet coming from internal network.\n"));
696 return NULL;
697 }
698 Log5(("VBoxNetFlt: Packet to %s of %d bytes (frame=%d).\n", fDstWire?"wire":"host", pSG->cbTotal, vboxNetFltLinuxFrameSize(pSG)));
699 if (fDstWire && (vboxNetFltLinuxFrameSize(pSG) > ASMAtomicReadU32(&pThis->u.s.cbMtu) + 14))
700 {
701 static bool s_fOnce = true;
702 if (s_fOnce)
703 {
704 s_fOnce = false;
705 printk("VBoxNetFlt: Dropped over-sized packet (%d bytes) coming from internal network.\n", vboxNetFltLinuxFrameSize(pSG));
706 }
707 return NULL;
708 }
709
710 /** @todo We should use fragments mapping the SG buffers with large packets.
711 * 256 bytes seems to be the a threshold used a lot for this. It
712 * requires some nasty work on the intnet side though... */
713 /*
714 * Allocate a packet and copy over the data.
715 */
716 pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
717 pPkt = dev_alloc_skb(pSG->cbTotal + NET_IP_ALIGN);
718 if (RT_UNLIKELY(!pPkt))
719 {
720 Log(("vboxNetFltLinuxSkBufFromSG: Failed to allocate sk_buff(%u).\n", pSG->cbTotal));
721 pSG->pvUserData = NULL;
722 return NULL;
723 }
724 pPkt->dev = pDev;
725 pPkt->ip_summed = CHECKSUM_NONE;
726
727 /* Align IP header on 16-byte boundary: 2 + 14 (ethernet hdr size). */
728 skb_reserve(pPkt, NET_IP_ALIGN);
729
730 /* Copy the segments. */
731 skb_put(pPkt, pSG->cbTotal);
732 IntNetSgRead(pSG, pPkt->data);
733
734#if defined(VBOXNETFLT_WITH_GSO_XMIT_WIRE) || defined(VBOXNETFLT_WITH_GSO_XMIT_HOST)
735 /*
736 * Setup GSO if used by this packet.
737 */
738 switch ((PDMNETWORKGSOTYPE)pSG->GsoCtx.u8Type)
739 {
740 default:
741 AssertMsgFailed(("%u (%s)\n", pSG->GsoCtx.u8Type, PDMNetGsoTypeName((PDMNETWORKGSOTYPE)pSG->GsoCtx.u8Type) ));
742 /* fall thru */
743 case PDMNETWORKGSOTYPE_INVALID:
744 fGsoType = 0;
745 break;
746 case PDMNETWORKGSOTYPE_IPV4_TCP:
747 fGsoType = SKB_GSO_TCPV4;
748 break;
749 case PDMNETWORKGSOTYPE_IPV4_UDP:
750 fGsoType = SKB_GSO_UDP;
751 break;
752 case PDMNETWORKGSOTYPE_IPV6_TCP:
753 fGsoType = SKB_GSO_TCPV6;
754 break;
755 }
756 if (fGsoType)
757 {
758 struct skb_shared_info *pShInfo = skb_shinfo(pPkt);
759
760 pShInfo->gso_type = fGsoType | SKB_GSO_DODGY;
761 pShInfo->gso_size = pSG->GsoCtx.cbMaxSeg;
762 pShInfo->gso_segs = PDMNetGsoCalcSegmentCount(&pSG->GsoCtx, pSG->cbTotal);
763
764 /*
765 * We need to set checksum fields even if the packet goes to the host
766 * directly as it may be immediately forwarded by IP layer @bugref{5020}.
767 */
768 Assert(skb_headlen(pPkt) >= pSG->GsoCtx.cbHdrsTotal);
769 pPkt->ip_summed = CHECKSUM_PARTIAL;
770# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22)
771 pPkt->csum_start = skb_headroom(pPkt) + pSG->GsoCtx.offHdr2;
772 if (fGsoType & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))
773 pPkt->csum_offset = RT_OFFSETOF(RTNETTCP, th_sum);
774 else
775 pPkt->csum_offset = RT_OFFSETOF(RTNETUDP, uh_sum);
776# else
777 pPkt->h.raw = pPkt->data + pSG->GsoCtx.offHdr2;
778 if (fGsoType & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))
779 pPkt->csum = RT_OFFSETOF(RTNETTCP, th_sum);
780 else
781 pPkt->csum = RT_OFFSETOF(RTNETUDP, uh_sum);
782# endif
783 if (!fDstWire)
784 PDMNetGsoPrepForDirectUse(&pSG->GsoCtx, pPkt->data, pSG->cbTotal, PDMNETCSUMTYPE_PSEUDO);
785 }
786#endif /* VBOXNETFLT_WITH_GSO_XMIT_WIRE || VBOXNETFLT_WITH_GSO_XMIT_HOST */
787
788 /*
789 * Finish up the socket buffer.
790 */
791 pPkt->protocol = eth_type_trans(pPkt, pDev);
792 if (fDstWire)
793 {
794 VBOX_SKB_RESET_NETWORK_HDR(pPkt);
795
796 /* Restore ethernet header back. */
797 skb_push(pPkt, ETH_HLEN); /** @todo VLAN: +4 if VLAN? */
798 VBOX_SKB_RESET_MAC_HDR(pPkt);
799 }
800 VBOXNETFLT_SKB_TAG(pPkt) = VBOXNETFLT_CB_TAG(pPkt);
801
802 return pPkt;
803}
804
805
806/**
807 * Return the offset where to start checksum computation from.
808 *
809 * @returns the offset relative to pBuf->data.
810 * @param pBuf The socket buffer.
811 */
812DECLINLINE(unsigned) vboxNetFltLinuxGetChecksumStartOffset(struct sk_buff *pBuf)
813{
814# if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 21)
815 unsigned char *pTransportHdr = pBuf->h.raw;
816# if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18)
817 /*
818 * Try to work around the problem with CentOS 4.7 and 5.2 (2.6.9
819 * and 2.6.18 kernels), they pass wrong 'h' pointer down. We take IP
820 * header length from the header itself and reconstruct 'h' pointer
821 * to TCP (or whatever) header.
822 */
823 if (pBuf->h.raw == pBuf->nh.raw && pBuf->protocol == htons(ETH_P_IP))
824 pTransportHdr = pBuf->nh.raw + pBuf->nh.iph->ihl * 4;
825# endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) */
826 return pTransportHdr - pBuf->data;
827# else /* LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 21) */
828# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 38)
829 return pBuf->csum_start - skb_headroom(pBuf);
830# else /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 38) */
831 return skb_checksum_start_offset(pBuf);
832# endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 38) */
833# endif /* LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 21) */
834}
835
836
837/**
838 * Initializes a SG list from an sk_buff.
839 *
840 * @returns Number of segments.
841 * @param pThis The instance.
842 * @param pBuf The sk_buff.
843 * @param pSG The SG.
844 * @param cbExtra The number of bytes of extra space allocated immediately after the SG.
845 * @param cSegs The number of segments allocated for the SG.
846 * This should match the number in the mbuf exactly!
847 * @param fSrc The source of the frame.
848 * @param pGsoCtx Pointer to the GSO context if it's a GSO
849 * internal network frame. NULL if regular frame.
850 */
851static void vboxNetFltLinuxSkBufToSG(PVBOXNETFLTINS pThis, struct sk_buff *pBuf, PINTNETSG pSG,
852 unsigned cbExtra, unsigned cSegs, uint32_t fSrc, PCPDMNETWORKGSO pGsoCtx)
853{
854 int i;
855 NOREF(pThis);
856
857#ifndef VBOXNETFLT_SG_SUPPORT
858 Assert(!skb_shinfo(pBuf)->frag_list);
859#else /* VBOXNETFLT_SG_SUPPORT */
860 uint8_t *pExtra = (uint8_t *)&pSG->aSegs[cSegs];
861 unsigned cbConsumed = 0;
862 unsigned cbProduced = 0;
863
864# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
865 /* Restore VLAN tag stripped by host hardware */
866 if (vlan_tx_tag_present(pBuf))
867 {
868 uint8_t *pMac = pBuf->data;
869 struct vlan_ethhdr *pVHdr = (struct vlan_ethhdr *)pExtra;
870 Assert(ETH_ALEN * 2 + VLAN_HLEN <= cbExtra);
871 memmove(pVHdr, pMac, ETH_ALEN * 2);
872 cbConsumed += ETH_ALEN * 2;
873 pVHdr->h_vlan_proto = RT_H2N_U16(ETH_P_8021Q);
874 pVHdr->h_vlan_TCI = RT_H2N_U16(vlan_tx_tag_get(pBuf));
875 pVHdr->h_vlan_encapsulated_proto = *(uint16_t*)(pMac + ETH_ALEN * 2);
876 cbProduced += VLAN_ETH_HLEN;
877 }
878# endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27) */
879
880 if (pBuf->ip_summed == CHECKSUM_PARTIAL && pBuf->pkt_type == PACKET_OUTGOING)
881 {
882 unsigned uCsumStartOffset = vboxNetFltLinuxGetChecksumStartOffset(pBuf);
883 unsigned uCsumStoreOffset = uCsumStartOffset + VBOX_SKB_CSUM_OFFSET(pBuf) - cbConsumed;
884 Log3(("cbConsumed=%u cbProduced=%u uCsumStartOffset=%u uCsumStoreOffset=%u\n",
885 cbConsumed, cbProduced, uCsumStartOffset, uCsumStoreOffset));
886 Assert(cbProduced + uCsumStoreOffset + sizeof(uint16_t) <= cbExtra);
887 /*
888 * We assume that the checksum is stored at the very end of the transport header
889 * so we will have all headers in a single fragment. If our assumption is wrong
890 * we may see suboptimal performance.
891 */
892 memmove(pExtra + cbProduced,
893 pBuf->data + cbConsumed,
894 uCsumStoreOffset);
895 unsigned uChecksum = skb_checksum(pBuf, uCsumStartOffset, pBuf->len - uCsumStartOffset, 0);
896 *(uint16_t*)(pExtra + cbProduced + uCsumStoreOffset) = csum_fold(uChecksum);
897 cbProduced += uCsumStoreOffset + sizeof(uint16_t);
898 cbConsumed += uCsumStoreOffset + sizeof(uint16_t);
899 }
900#endif /* VBOXNETFLT_SG_SUPPORT */
901
902 if (!pGsoCtx)
903 IntNetSgInitTempSegs(pSG, pBuf->len, cSegs, 0 /*cSegsUsed*/);
904 else
905 IntNetSgInitTempSegsGso(pSG, pBuf->len, cSegs, 0 /*cSegsUsed*/, pGsoCtx);
906
907 int iSeg = 0;
908#ifdef VBOXNETFLT_SG_SUPPORT
909 if (cbProduced)
910 {
911 pSG->aSegs[iSeg].cb = cbProduced;
912 pSG->aSegs[iSeg].pv = pExtra;
913 pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
914 }
915 pSG->aSegs[iSeg].cb = skb_headlen(pBuf) - cbConsumed;
916 pSG->aSegs[iSeg].pv = pBuf->data + cbConsumed;
917 pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
918 Assert(iSeg <= pSG->cSegsAlloc);
919
920# ifdef LOG_ENABLED
921 if (pBuf->data_len)
922 Log6((" kmap_atomic:"));
923# endif /* LOG_ENABLED */
924 for (i = 0; i < skb_shinfo(pBuf)->nr_frags; i++)
925 {
926 skb_frag_t *pFrag = &skb_shinfo(pBuf)->frags[i];
927 pSG->aSegs[iSeg].cb = pFrag->size;
928 pSG->aSegs[iSeg].pv = VBOX_SKB_KMAP_FRAG(pFrag) + pFrag->page_offset;
929 Log6((" %p", pSG->aSegs[iSeg].pv));
930 pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
931 Assert(iSeg <= pSG->cSegsAlloc);
932 }
933 struct sk_buff *pFragBuf;
934 for (pFragBuf = skb_shinfo(pBuf)->frag_list; pFragBuf; pFragBuf = pFragBuf->next)
935 {
936 pSG->aSegs[iSeg].cb = skb_headlen(pFragBuf);
937 pSG->aSegs[iSeg].pv = pFragBuf->data;
938 pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
939 Assert(iSeg <= pSG->cSegsAlloc);
940 for (i = 0; i < skb_shinfo(pFragBuf)->nr_frags; i++)
941 {
942 skb_frag_t *pFrag = &skb_shinfo(pFragBuf)->frags[i];
943 pSG->aSegs[iSeg].cb = pFrag->size;
944 pSG->aSegs[iSeg].pv = VBOX_SKB_KMAP_FRAG(pFrag) + pFrag->page_offset;
945 Log6((" %p", pSG->aSegs[iSeg].pv));
946 pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
947 Assert(iSeg <= pSG->cSegsAlloc);
948 }
949 }
950# ifdef LOG_ENABLED
951 if (pBuf->data_len)
952 Log6(("\n"));
953# endif /* LOG_ENABLED */
954#else
955 pSG->aSegs[iSeg].cb = pBuf->len;
956 pSG->aSegs[iSeg].pv = pBuf->data;
957 pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
958#endif
959
960 pSG->cSegsUsed = iSeg;
961
962#ifdef PADD_RUNT_FRAMES_FROM_HOST
963 /*
964 * Add a trailer if the frame is too small.
965 *
966 * Since we're getting to the packet before it is framed, it has not
967 * yet been padded. The current solution is to add a segment pointing
968 * to a buffer containing all zeros and pray that works for all frames...
969 */
970 if (pSG->cbTotal < 60 && (fSrc & INTNETTRUNKDIR_HOST))
971 {
972 Assert(pBuf->data_len == 0); /* Packets with fragments are never small! */
973 static uint8_t const s_abZero[128] = {0};
974
975 AssertReturnVoid(iSeg < cSegs);
976
977 pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
978 pSG->aSegs[iSeg].pv = (void *)&s_abZero[0];
979 pSG->aSegs[iSeg++].cb = 60 - pSG->cbTotal;
980 pSG->cbTotal = 60;
981 pSG->cSegsUsed++;
982 Assert(iSeg <= pSG->cSegsAlloc)
983 }
984#endif
985
986 Log6(("vboxNetFltLinuxSkBufToSG: allocated=%d, segments=%d frags=%d next=%p frag_list=%p pkt_type=%x fSrc=%x\n",
987 pSG->cSegsAlloc, pSG->cSegsUsed, skb_shinfo(pBuf)->nr_frags, pBuf->next, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type, fSrc));
988 for (i = 0; i < pSG->cSegsUsed; i++)
989 Log6(("vboxNetFltLinuxSkBufToSG: #%d: cb=%d pv=%p\n",
990 i, pSG->aSegs[i].cb, pSG->aSegs[i].pv));
991}
992
993/**
994 * Packet handler; not really documented - figure it out yourself.
995 *
996 * @returns 0 or EJUSTRETURN - this is probably copy & pastry and thus wrong.
997 */
998#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 14)
999static int vboxNetFltLinuxPacketHandler(struct sk_buff *pBuf,
1000 struct net_device *pSkbDev,
1001 struct packet_type *pPacketType,
1002 struct net_device *pOrigDev)
1003#else
1004static int vboxNetFltLinuxPacketHandler(struct sk_buff *pBuf,
1005 struct net_device *pSkbDev,
1006 struct packet_type *pPacketType)
1007#endif
1008{
1009 PVBOXNETFLTINS pThis;
1010 struct net_device *pDev;
1011 LogFlow(("vboxNetFltLinuxPacketHandler: pBuf=%p pSkbDev=%p pPacketType=%p\n",
1012 pBuf, pSkbDev, pPacketType));
1013#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18)
1014 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",
1015 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));
1016# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22)
1017 Log6(("vboxNetFltLinuxPacketHandler: packet dump follows:\n%.*Rhxd\n", pBuf->len-pBuf->data_len, skb_mac_header(pBuf)));
1018# endif
1019#else
1020 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",
1021 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));
1022#endif
1023 /*
1024 * Drop it immediately?
1025 */
1026 if (!pBuf)
1027 return 0;
1028
1029 if (pBuf->pkt_type == PACKET_LOOPBACK)
1030 {
1031 /*
1032 * We are not interested in loopbacked packets as they will always have
1033 * another copy going to the wire.
1034 */
1035 Log2(("vboxNetFltLinuxPacketHandler: dropped loopback packet (cb=%u)\n", pBuf->len));
1036 dev_kfree_skb(pBuf); /* We must 'consume' all packets we get (@bugref{6539})! */
1037 return 0;
1038 }
1039
1040 pThis = VBOX_FLT_PT_TO_INST(pPacketType);
1041 pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
1042 if (pDev != pSkbDev)
1043 {
1044 Log(("vboxNetFltLinuxPacketHandler: Devices do not match, pThis may be wrong! pThis=%p\n", pThis));
1045 kfree_skb(pBuf); /* This is a failure, so we use kfree_skb instead of dev_kfree_skb. */
1046 return 0;
1047 }
1048
1049 Log6(("vboxNetFltLinuxPacketHandler: pBuf->cb dump:\n%.*Rhxd\n", sizeof(pBuf->cb), pBuf->cb));
1050 if (vboxNetFltLinuxSkBufIsOur(pBuf))
1051 {
1052 Log2(("vboxNetFltLinuxPacketHandler: got our own sk_buff, drop it.\n"));
1053 dev_kfree_skb(pBuf);
1054 return 0;
1055 }
1056
1057#ifndef VBOXNETFLT_SG_SUPPORT
1058 {
1059 /*
1060 * Get rid of fragmented packets, they cause too much trouble.
1061 */
1062 unsigned int uMacLen = pBuf->mac_len;
1063 struct sk_buff *pCopy = skb_copy(pBuf, GFP_ATOMIC);
1064 dev_kfree_skb(pBuf);
1065 if (!pCopy)
1066 {
1067 LogRel(("VBoxNetFlt: Failed to allocate packet buffer, dropping the packet.\n"));
1068 return 0;
1069 }
1070 pBuf = pCopy;
1071 /* Somehow skb_copy ignores mac_len */
1072 pBuf->mac_len = uMacLen;
1073# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
1074 /* Restore VLAN tag stripped by host hardware */
1075 if (vlan_tx_tag_present(pBuf) && skb_headroom(pBuf) >= VLAN_ETH_HLEN)
1076 {
1077 uint8_t *pMac = (uint8_t*)skb_mac_header(pBuf);
1078 struct vlan_ethhdr *pVHdr = (struct vlan_ethhdr *)(pMac - VLAN_HLEN);
1079 memmove(pVHdr, pMac, ETH_ALEN * 2);
1080 pVHdr->h_vlan_proto = RT_H2N_U16(ETH_P_8021Q);
1081 pVHdr->h_vlan_TCI = RT_H2N_U16(vlan_tx_tag_get(pBuf));
1082 pBuf->mac_header -= VLAN_HLEN;
1083 pBuf->mac_len += VLAN_HLEN;
1084 }
1085# endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27) */
1086
1087# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18)
1088 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",
1089 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));
1090# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22)
1091 Log6(("vboxNetFltLinuxPacketHandler: packet dump follows:\n%.*Rhxd\n", pBuf->len-pBuf->data_len, skb_mac_header(pBuf)));
1092# endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22) */
1093# else /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18) */
1094 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",
1095 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));
1096# endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18) */
1097 }
1098#endif /* !VBOXNETFLT_SG_SUPPORT */
1099
1100#ifdef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
1101 /* Forward it to the internal network. */
1102 vboxNetFltLinuxForwardToIntNet(pThis, pBuf);
1103#else /* !VBOXNETFLT_LINUX_NO_XMIT_QUEUE */
1104 /* Add the packet to transmit queue and schedule the bottom half. */
1105 skb_queue_tail(&pThis->u.s.XmitQueue, pBuf);
1106 schedule_work(&pThis->u.s.XmitTask);
1107 Log6(("vboxNetFltLinuxPacketHandler: scheduled work %p for sk_buff %p\n",
1108 &pThis->u.s.XmitTask, pBuf));
1109#endif /* !VBOXNETFLT_LINUX_NO_XMIT_QUEUE */
1110
1111 /* It does not really matter what we return, it is ignored by the kernel. */
1112 return 0;
1113}
1114
1115/**
1116 * Calculate the number of INTNETSEG segments the socket buffer will need.
1117 *
1118 * @returns Segment count.
1119 * @param pBuf The socket buffer.
1120 * @param pcbTemp Where to store the number of bytes of the part
1121 * of the socket buffer that will be copied to
1122 * a temporary storage.
1123 */
1124DECLINLINE(unsigned) vboxNetFltLinuxCalcSGSegments(struct sk_buff *pBuf, unsigned *pcbTemp)
1125{
1126 *pcbTemp = 0;
1127#ifdef VBOXNETFLT_SG_SUPPORT
1128 unsigned cSegs = 1 + skb_shinfo(pBuf)->nr_frags;
1129 if (pBuf->ip_summed == CHECKSUM_PARTIAL && pBuf->pkt_type == PACKET_OUTGOING)
1130 {
1131 *pcbTemp = vboxNetFltLinuxGetChecksumStartOffset(pBuf) + VBOX_SKB_CSUM_OFFSET(pBuf) + sizeof(uint16_t);
1132 }
1133# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
1134 if (vlan_tx_tag_present(pBuf))
1135 {
1136 if (*pcbTemp)
1137 *pcbTemp += VLAN_HLEN;
1138 else
1139 *pcbTemp = VLAN_ETH_HLEN;
1140 }
1141# endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27) */
1142 if (*pcbTemp)
1143 ++cSegs;
1144 struct sk_buff *pFrag;
1145 for (pFrag = skb_shinfo(pBuf)->frag_list; pFrag; pFrag = pFrag->next)
1146 {
1147 Log6(("vboxNetFltLinuxCalcSGSegments: frag=%p len=%d data_len=%d frags=%d frag_list=%p next=%p\n",
1148 pFrag, pFrag->len, pFrag->data_len, skb_shinfo(pFrag)->nr_frags, skb_shinfo(pFrag)->frag_list, pFrag->next));
1149 cSegs += 1 + skb_shinfo(pFrag)->nr_frags;
1150 }
1151#else
1152 unsigned cSegs = 1;
1153#endif
1154#ifdef PADD_RUNT_FRAMES_FROM_HOST
1155 /* vboxNetFltLinuxSkBufToSG adds a padding segment if it's a runt. */
1156 if (pBuf->len < 60)
1157 cSegs++;
1158#endif
1159 return cSegs;
1160}
1161
1162
1163/**
1164 * Destroy the intnet scatter / gather buffer created by
1165 * vboxNetFltLinuxSkBufToSG.
1166 *
1167 * @param pSG The (scatter/)gather list.
1168 * @param pBuf The original socket buffer that was used to create
1169 * the scatter/gather list.
1170 */
1171static void vboxNetFltLinuxDestroySG(PINTNETSG pSG, struct sk_buff *pBuf)
1172{
1173#ifdef VBOXNETFLT_SG_SUPPORT
1174 int i, iSeg = 1; /* Skip non-paged part of SKB */
1175 /* Check if the extra buffer behind SG structure was used for modified packet header */
1176 if (pBuf->data != pSG->aSegs[0].pv)
1177 ++iSeg; /* Skip it as well */
1178# ifdef LOG_ENABLED
1179 if (pBuf->data_len)
1180 Log6(("kunmap_atomic:"));
1181# endif /* LOG_ENABLED */
1182 /* iSeg now points to the first mapped fragment if there are any */
1183 for (i = 0; i < skb_shinfo(pBuf)->nr_frags; i++)
1184 {
1185 Log6((" %p", pSG->aSegs[iSeg].pv));
1186 VBOX_SKB_KUNMAP_FRAG(pSG->aSegs[iSeg++].pv);
1187 }
1188 struct sk_buff *pFragBuf;
1189 for (pFragBuf = skb_shinfo(pBuf)->frag_list; pFragBuf; pFragBuf = pFragBuf->next)
1190 {
1191 ++iSeg; /* Non-fragment (unmapped) portion of chained SKB */
1192 for (i = 0; i < skb_shinfo(pFragBuf)->nr_frags; i++)
1193 {
1194 Log6((" %p", pSG->aSegs[iSeg].pv));
1195 VBOX_SKB_KUNMAP_FRAG(pSG->aSegs[iSeg++].pv);
1196 }
1197 }
1198# ifdef LOG_ENABLED
1199 if (pBuf->data_len)
1200 Log6(("\n"));
1201# endif /* LOG_ENABLED */
1202#endif
1203 NOREF(pSG);
1204}
1205
1206#ifdef LOG_ENABLED
1207/**
1208 * Logging helper.
1209 */
1210static void vboxNetFltDumpPacket(PINTNETSG pSG, bool fEgress, const char *pszWhere, int iIncrement)
1211{
1212 int i, offSeg;
1213 uint8_t *pInt, *pExt;
1214 static int iPacketNo = 1;
1215 iPacketNo += iIncrement;
1216 if (fEgress)
1217 {
1218 pExt = pSG->aSegs[0].pv;
1219 pInt = pExt + 6;
1220 }
1221 else
1222 {
1223 pInt = pSG->aSegs[0].pv;
1224 pExt = pInt + 6;
1225 }
1226 Log(("VBoxNetFlt: (int)%02x:%02x:%02x:%02x:%02x:%02x"
1227 " %s (%s)%02x:%02x:%02x:%02x:%02x:%02x (%u bytes) packet #%u\n",
1228 pInt[0], pInt[1], pInt[2], pInt[3], pInt[4], pInt[5],
1229 fEgress ? "-->" : "<--", pszWhere,
1230 pExt[0], pExt[1], pExt[2], pExt[3], pExt[4], pExt[5],
1231 pSG->cbTotal, iPacketNo));
1232 if (pSG->cSegsUsed == 1)
1233 {
1234 Log4(("%.*Rhxd\n", pSG->aSegs[0].cb, pSG->aSegs[0].pv));
1235 }
1236 else
1237 {
1238 for (i = 0, offSeg = 0; i < pSG->cSegsUsed; i++)
1239 {
1240 Log4(("-- segment %d at 0x%x (%d bytes)\n --\n%.*Rhxd\n",
1241 i, offSeg, pSG->aSegs[i].cb, pSG->aSegs[i].cb, pSG->aSegs[i].pv));
1242 offSeg += pSG->aSegs[i].cb;
1243 }
1244 }
1245}
1246#else
1247# define vboxNetFltDumpPacket(a, b, c, d) do {} while (0)
1248#endif
1249
1250#ifdef VBOXNETFLT_WITH_GSO_RECV
1251
1252/**
1253 * Worker for vboxNetFltLinuxForwardToIntNet that checks if we can forwards a
1254 * GSO socket buffer without having to segment it.
1255 *
1256 * @returns true on success, false if needs segmenting.
1257 * @param pThis The net filter instance.
1258 * @param pSkb The GSO socket buffer.
1259 * @param fSrc The source.
1260 * @param pGsoCtx Where to return the GSO context on success.
1261 */
1262static bool vboxNetFltLinuxCanForwardAsGso(PVBOXNETFLTINS pThis, struct sk_buff *pSkb, uint32_t fSrc,
1263 PPDMNETWORKGSO pGsoCtx)
1264{
1265 PDMNETWORKGSOTYPE enmGsoType;
1266 uint16_t uEtherType;
1267 unsigned int cbTransport;
1268 unsigned int offTransport;
1269 unsigned int cbTransportHdr;
1270 unsigned uProtocol;
1271 union
1272 {
1273 RTNETIPV4 IPv4;
1274 RTNETIPV6 IPv6;
1275 RTNETTCP Tcp;
1276 uint8_t ab[40];
1277 uint16_t au16[40/2];
1278 uint32_t au32[40/4];
1279 } Buf;
1280
1281 /*
1282 * Check the GSO properties of the socket buffer and make sure it fits.
1283 */
1284 /** @todo Figure out how to handle SKB_GSO_TCP_ECN! */
1285 if (RT_UNLIKELY( skb_shinfo(pSkb)->gso_type & ~(SKB_GSO_UDP | SKB_GSO_DODGY | SKB_GSO_TCPV6 | SKB_GSO_TCPV4) ))
1286 {
1287 Log5(("vboxNetFltLinuxCanForwardAsGso: gso_type=%#x\n", skb_shinfo(pSkb)->gso_type));
1288 return false;
1289 }
1290 if (RT_UNLIKELY( skb_shinfo(pSkb)->gso_size < 1
1291 || pSkb->len > VBOX_MAX_GSO_SIZE ))
1292 {
1293 Log5(("vboxNetFltLinuxCanForwardAsGso: gso_size=%#x skb_len=%#x (max=%#x)\n", skb_shinfo(pSkb)->gso_size, pSkb->len, VBOX_MAX_GSO_SIZE));
1294 return false;
1295 }
1296
1297 /*
1298 * Switch on the ethertype.
1299 */
1300 uEtherType = pSkb->protocol;
1301 if ( uEtherType == RT_H2N_U16_C(RTNET_ETHERTYPE_VLAN)
1302 && pSkb->mac_len == sizeof(RTNETETHERHDR) + sizeof(uint32_t))
1303 {
1304 uint16_t const *puEtherType = skb_header_pointer(pSkb, sizeof(RTNETETHERHDR) + sizeof(uint16_t), sizeof(uint16_t), &Buf);
1305 if (puEtherType)
1306 uEtherType = *puEtherType;
1307 }
1308 switch (uEtherType)
1309 {
1310 case RT_H2N_U16_C(RTNET_ETHERTYPE_IPV4):
1311 {
1312 unsigned int cbHdr;
1313 PCRTNETIPV4 pIPv4 = (PCRTNETIPV4)skb_header_pointer(pSkb, pSkb->mac_len, sizeof(Buf.IPv4), &Buf);
1314 if (RT_UNLIKELY(!pIPv4))
1315 {
1316 Log5(("vboxNetFltLinuxCanForwardAsGso: failed to access IPv4 hdr\n"));
1317 return false;
1318 }
1319
1320 cbHdr = pIPv4->ip_hl * 4;
1321 cbTransport = RT_N2H_U16(pIPv4->ip_len);
1322 if (RT_UNLIKELY( cbHdr < RTNETIPV4_MIN_LEN
1323 || cbHdr > cbTransport ))
1324 {
1325 Log5(("vboxNetFltLinuxCanForwardAsGso: invalid IPv4 lengths: ip_hl=%u ip_len=%u\n", pIPv4->ip_hl, RT_N2H_U16(pIPv4->ip_len)));
1326 return false;
1327 }
1328 cbTransport -= cbHdr;
1329 offTransport = pSkb->mac_len + cbHdr;
1330 uProtocol = pIPv4->ip_p;
1331 if (uProtocol == RTNETIPV4_PROT_TCP)
1332 enmGsoType = PDMNETWORKGSOTYPE_IPV4_TCP;
1333 else if (uProtocol == RTNETIPV4_PROT_UDP)
1334 enmGsoType = PDMNETWORKGSOTYPE_IPV4_UDP;
1335 else /** @todo IPv6: 4to6 tunneling */
1336 enmGsoType = PDMNETWORKGSOTYPE_INVALID;
1337 break;
1338 }
1339
1340 case RT_H2N_U16_C(RTNET_ETHERTYPE_IPV6):
1341 {
1342 PCRTNETIPV6 pIPv6 = (PCRTNETIPV6)skb_header_pointer(pSkb, pSkb->mac_len, sizeof(Buf.IPv6), &Buf);
1343 if (RT_UNLIKELY(!pIPv6))
1344 {
1345 Log5(("vboxNetFltLinuxCanForwardAsGso: failed to access IPv6 hdr\n"));
1346 return false;
1347 }
1348
1349 cbTransport = RT_N2H_U16(pIPv6->ip6_plen);
1350 offTransport = pSkb->mac_len + sizeof(RTNETIPV6);
1351 uProtocol = pIPv6->ip6_nxt;
1352 /** @todo IPv6: Dig our way out of the other headers. */
1353 if (uProtocol == RTNETIPV4_PROT_TCP)
1354 enmGsoType = PDMNETWORKGSOTYPE_IPV6_TCP;
1355 else if (uProtocol == RTNETIPV4_PROT_UDP)
1356 enmGsoType = PDMNETWORKGSOTYPE_IPV6_UDP;
1357 else
1358 enmGsoType = PDMNETWORKGSOTYPE_INVALID;
1359 break;
1360 }
1361
1362 default:
1363 Log5(("vboxNetFltLinuxCanForwardAsGso: uEtherType=%#x\n", RT_H2N_U16(uEtherType)));
1364 return false;
1365 }
1366
1367 if (enmGsoType == PDMNETWORKGSOTYPE_INVALID)
1368 {
1369 Log5(("vboxNetFltLinuxCanForwardAsGso: Unsupported protocol %d\n", uProtocol));
1370 return false;
1371 }
1372
1373 if (RT_UNLIKELY( offTransport + cbTransport <= offTransport
1374 || offTransport + cbTransport > pSkb->len
1375 || cbTransport < (uProtocol == RTNETIPV4_PROT_TCP ? RTNETTCP_MIN_LEN : RTNETUDP_MIN_LEN)) )
1376 {
1377 Log5(("vboxNetFltLinuxCanForwardAsGso: Bad transport length; off=%#x + cb=%#x => %#x; skb_len=%#x (%s)\n",
1378 offTransport, cbTransport, offTransport + cbTransport, pSkb->len, PDMNetGsoTypeName(enmGsoType) ));
1379 return false;
1380 }
1381
1382 /*
1383 * Check the TCP/UDP bits.
1384 */
1385 if (uProtocol == RTNETIPV4_PROT_TCP)
1386 {
1387 PCRTNETTCP pTcp = (PCRTNETTCP)skb_header_pointer(pSkb, offTransport, sizeof(Buf.Tcp), &Buf);
1388 if (RT_UNLIKELY(!pTcp))
1389 {
1390 Log5(("vboxNetFltLinuxCanForwardAsGso: failed to access TCP hdr\n"));
1391 return false;
1392 }
1393
1394 cbTransportHdr = pTcp->th_off * 4;
1395 pGsoCtx->cbHdrsSeg = offTransport + cbTransportHdr;
1396 if (RT_UNLIKELY( cbTransportHdr < RTNETTCP_MIN_LEN
1397 || cbTransportHdr > cbTransport
1398 || offTransport + cbTransportHdr >= UINT8_MAX
1399 || offTransport + cbTransportHdr >= pSkb->len ))
1400 {
1401 Log5(("vboxNetFltLinuxCanForwardAsGso: No space for TCP header; off=%#x cb=%#x skb_len=%#x\n", offTransport, cbTransportHdr, pSkb->len));
1402 return false;
1403 }
1404
1405 }
1406 else
1407 {
1408 Assert(uProtocol == RTNETIPV4_PROT_UDP);
1409 cbTransportHdr = sizeof(RTNETUDP);
1410 pGsoCtx->cbHdrsSeg = offTransport; /* Exclude UDP header */
1411 if (RT_UNLIKELY( offTransport + cbTransportHdr >= UINT8_MAX
1412 || offTransport + cbTransportHdr >= pSkb->len ))
1413 {
1414 Log5(("vboxNetFltLinuxCanForwardAsGso: No space for UDP header; off=%#x skb_len=%#x\n", offTransport, pSkb->len));
1415 return false;
1416 }
1417 }
1418
1419 /*
1420 * We're good, init the GSO context.
1421 */
1422 pGsoCtx->u8Type = enmGsoType;
1423 pGsoCtx->cbHdrsTotal = offTransport + cbTransportHdr;
1424 pGsoCtx->cbMaxSeg = skb_shinfo(pSkb)->gso_size;
1425 pGsoCtx->offHdr1 = pSkb->mac_len;
1426 pGsoCtx->offHdr2 = offTransport;
1427 pGsoCtx->u8Unused = 0;
1428
1429 return true;
1430}
1431
1432/**
1433 * Forward the socket buffer as a GSO internal network frame.
1434 *
1435 * @returns IPRT status code.
1436 * @param pThis The net filter instance.
1437 * @param pSkb The GSO socket buffer.
1438 * @param fSrc The source.
1439 * @param pGsoCtx Where to return the GSO context on success.
1440 */
1441static int vboxNetFltLinuxForwardAsGso(PVBOXNETFLTINS pThis, struct sk_buff *pSkb, uint32_t fSrc, PCPDMNETWORKGSO pGsoCtx)
1442{
1443 int rc;
1444 unsigned cbExtra;
1445 unsigned cSegs = vboxNetFltLinuxCalcSGSegments(pSkb, &cbExtra);
1446 PINTNETSG pSG = (PINTNETSG)alloca(RT_OFFSETOF(INTNETSG, aSegs[cSegs]) + cbExtra);
1447 if (RT_LIKELY(pSG))
1448 {
1449 vboxNetFltLinuxSkBufToSG(pThis, pSkb, pSG, cbExtra, cSegs, fSrc, pGsoCtx);
1450
1451 vboxNetFltDumpPacket(pSG, false, (fSrc & INTNETTRUNKDIR_HOST) ? "host" : "wire", 1);
1452 pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL /* pvIf */, pSG, fSrc);
1453
1454 vboxNetFltLinuxDestroySG(pSG, pSkb);
1455 rc = VINF_SUCCESS;
1456 }
1457 else
1458 {
1459 Log(("VBoxNetFlt: Dropping the sk_buff (failure case).\n"));
1460 rc = VERR_NO_MEMORY;
1461 }
1462 return rc;
1463}
1464
1465#endif /* VBOXNETFLT_WITH_GSO_RECV */
1466
1467/**
1468 * Worker for vboxNetFltLinuxForwardToIntNet.
1469 *
1470 * @returns VINF_SUCCESS or VERR_NO_MEMORY.
1471 * @param pThis The net filter instance.
1472 * @param pBuf The socket buffer.
1473 * @param fSrc The source.
1474 */
1475static int vboxNetFltLinuxForwardSegment(PVBOXNETFLTINS pThis, struct sk_buff *pBuf, uint32_t fSrc)
1476{
1477 int rc;
1478 unsigned cbExtra;
1479 unsigned cSegs = vboxNetFltLinuxCalcSGSegments(pBuf, &cbExtra);
1480 PINTNETSG pSG = (PINTNETSG)alloca(RT_OFFSETOF(INTNETSG, aSegs[cSegs]) + cbExtra);
1481 if (RT_LIKELY(pSG))
1482 {
1483 vboxNetFltLinuxSkBufToSG(pThis, pBuf, pSG, cbExtra, cSegs, fSrc, NULL /*pGsoCtx*/);
1484
1485 vboxNetFltDumpPacket(pSG, false, (fSrc & INTNETTRUNKDIR_HOST) ? "host" : "wire", 1);
1486 pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL /* pvIf */, pSG, fSrc);
1487
1488 vboxNetFltLinuxDestroySG(pSG, pBuf);
1489 rc = VINF_SUCCESS;
1490 }
1491 else
1492 {
1493 Log(("VBoxNetFlt: Failed to allocate SG buffer.\n"));
1494 rc = VERR_NO_MEMORY;
1495 }
1496 return rc;
1497}
1498
1499
1500/**
1501 * I won't disclose what I do, figure it out yourself, including pThis referencing.
1502 *
1503 * @param pThis The net filter instance.
1504 * @param pBuf The socket buffer.
1505 * @param fSrc Where the packet comes from.
1506 */
1507static void vboxNetFltLinuxForwardToIntNetInner(PVBOXNETFLTINS pThis, struct sk_buff *pBuf, uint32_t fSrc)
1508{
1509#ifdef VBOXNETFLT_WITH_GSO
1510 if (skb_is_gso(pBuf))
1511 {
1512 PDMNETWORKGSO GsoCtx;
1513 Log6(("vboxNetFltLinuxForwardToIntNetInner: skb len=%u data_len=%u truesize=%u next=%p"
1514 " nr_frags=%u gso_size=%u gso_seqs=%u gso_type=%x frag_list=%p pkt_type=%x ip_summed=%d\n",
1515 pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next,
1516 skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->gso_size,
1517 skb_shinfo(pBuf)->gso_segs, skb_shinfo(pBuf)->gso_type,
1518 skb_shinfo(pBuf)->frag_list, pBuf->pkt_type, pBuf->ip_summed));
1519#ifndef VBOXNETFLT_SG_SUPPORT
1520 if (RT_LIKELY(fSrc & INTNETTRUNKDIR_HOST))
1521 {
1522 /*
1523 * skb_gso_segment does the following. Do we need to do it as well?
1524 */
1525# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22)
1526 skb_reset_mac_header(pBuf);
1527 pBuf->mac_len = pBuf->network_header - pBuf->mac_header;
1528# else
1529 pBuf->mac.raw = pBuf->data;
1530 pBuf->mac_len = pBuf->nh.raw - pBuf->data;
1531# endif
1532 }
1533#endif /* !VBOXNETFLT_SG_SUPPORT */
1534# ifdef VBOXNETFLT_WITH_GSO_RECV
1535 if ( (skb_shinfo(pBuf)->gso_type & (SKB_GSO_UDP | SKB_GSO_TCPV6 | SKB_GSO_TCPV4))
1536 && vboxNetFltLinuxCanForwardAsGso(pThis, pBuf, fSrc, &GsoCtx) )
1537 vboxNetFltLinuxForwardAsGso(pThis, pBuf, fSrc, &GsoCtx);
1538 else
1539# endif /* VBOXNETFLT_WITH_GSO_RECV */
1540 {
1541 /* Need to segment the packet */
1542 struct sk_buff *pNext;
1543 struct sk_buff *pSegment = skb_gso_segment(pBuf, 0 /*supported features*/);
1544 if (IS_ERR(pSegment))
1545 {
1546 LogRel(("VBoxNetFlt: Failed to segment a packet (%d).\n", PTR_ERR(pSegment)));
1547 return;
1548 }
1549
1550 for (; pSegment; pSegment = pNext)
1551 {
1552 Log6(("vboxNetFltLinuxForwardToIntNetInner: segment len=%u data_len=%u truesize=%u next=%p"
1553 " nr_frags=%u gso_size=%u gso_seqs=%u gso_type=%x frag_list=%p pkt_type=%x\n",
1554 pSegment->len, pSegment->data_len, pSegment->truesize, pSegment->next,
1555 skb_shinfo(pSegment)->nr_frags, skb_shinfo(pSegment)->gso_size,
1556 skb_shinfo(pSegment)->gso_segs, skb_shinfo(pSegment)->gso_type,
1557 skb_shinfo(pSegment)->frag_list, pSegment->pkt_type));
1558 pNext = pSegment->next;
1559 pSegment->next = 0;
1560 vboxNetFltLinuxForwardSegment(pThis, pSegment, fSrc);
1561 dev_kfree_skb(pSegment);
1562 }
1563 }
1564 }
1565 else
1566#endif /* VBOXNETFLT_WITH_GSO */
1567 {
1568 Log6(("vboxNetFltLinuxForwardToIntNetInner: ptk_type=%d ip_summed=%d len=%d"
1569 " data_len=%d headroom=%d hdr_len=%d csum_offset=%d\n",
1570 pBuf->pkt_type, pBuf->ip_summed, pBuf->len, pBuf->data_len, skb_headroom(pBuf),
1571 skb_headlen(pBuf), vboxNetFltLinuxGetChecksumStartOffset(pBuf)));
1572#ifndef VBOXNETFLT_SG_SUPPORT
1573 if (pBuf->ip_summed == CHECKSUM_PARTIAL && pBuf->pkt_type == PACKET_OUTGOING)
1574 {
1575#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18)
1576 /*
1577 * Try to work around the problem with CentOS 4.7 and 5.2 (2.6.9
1578 * and 2.6.18 kernels), they pass wrong 'h' pointer down. We take IP
1579 * header length from the header itself and reconstruct 'h' pointer
1580 * to TCP (or whatever) header.
1581 */
1582 unsigned char *tmp = pBuf->h.raw;
1583 if (pBuf->h.raw == pBuf->nh.raw && pBuf->protocol == htons(ETH_P_IP))
1584 pBuf->h.raw = pBuf->nh.raw + pBuf->nh.iph->ihl * 4;
1585#endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) */
1586 int rc = VBOX_SKB_CHECKSUM_HELP(pBuf);
1587#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18)
1588 /* Restore the original (wrong) pointer. */
1589 pBuf->h.raw = tmp;
1590#endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) */
1591 if (rc) {
1592 LogRel(("VBoxNetFlt: Failed to compute checksum, dropping the packet.\n"));
1593 return;
1594 }
1595 }
1596#endif /* !VBOXNETFLT_SG_SUPPORT */
1597 vboxNetFltLinuxForwardSegment(pThis, pBuf, fSrc);
1598 }
1599}
1600
1601
1602/**
1603 * Temporarily adjust pBuf->data so it always points to the Ethernet header,
1604 * then forward it to the internal network.
1605 *
1606 * @param pThis The net filter instance.
1607 * @param pBuf The socket buffer. This is consumed by this function.
1608 */
1609static void vboxNetFltLinuxForwardToIntNet(PVBOXNETFLTINS pThis, struct sk_buff *pBuf)
1610{
1611 uint32_t fSrc = pBuf->pkt_type == PACKET_OUTGOING ? INTNETTRUNKDIR_HOST : INTNETTRUNKDIR_WIRE;
1612
1613 if (RT_UNLIKELY(fSrc & INTNETTRUNKDIR_WIRE))
1614 {
1615 /*
1616 * The packet came from the wire and the driver has already consumed
1617 * mac header. We need to restore it back. Moreover, after we are
1618 * through with this skb we need to restore its original state!
1619 */
1620 skb_push(pBuf, pBuf->mac_len);
1621 Log5(("vboxNetFltLinuxForwardToIntNet: mac_len=%d data=%p mac_header=%p network_header=%p\n",
1622 pBuf->mac_len, pBuf->data, skb_mac_header(pBuf), skb_network_header(pBuf)));
1623 }
1624
1625 vboxNetFltLinuxForwardToIntNetInner(pThis, pBuf, fSrc);
1626
1627 /*
1628 * Restore the original state of skb as there are other handlers this skb
1629 * will be provided to.
1630 */
1631 if (RT_UNLIKELY(fSrc & INTNETTRUNKDIR_WIRE))
1632 skb_pull(pBuf, pBuf->mac_len);
1633
1634 dev_kfree_skb(pBuf);
1635}
1636
1637
1638#ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
1639/**
1640 * Work queue handler that forwards the socket buffers queued by
1641 * vboxNetFltLinuxPacketHandler to the internal network.
1642 *
1643 * @param pWork The work queue.
1644 */
1645# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
1646static void vboxNetFltLinuxXmitTask(struct work_struct *pWork)
1647# else
1648static void vboxNetFltLinuxXmitTask(void *pWork)
1649# endif
1650{
1651 PVBOXNETFLTINS pThis = VBOX_FLT_XT_TO_INST(pWork);
1652 struct sk_buff *pBuf;
1653
1654 Log6(("vboxNetFltLinuxXmitTask: Got work %p.\n", pWork));
1655
1656 /*
1657 * Active? Retain the instance and increment the busy counter.
1658 */
1659 if (vboxNetFltTryRetainBusyActive(pThis))
1660 {
1661 while ((pBuf = skb_dequeue(&pThis->u.s.XmitQueue)) != NULL)
1662 vboxNetFltLinuxForwardToIntNet(pThis, pBuf);
1663
1664 vboxNetFltRelease(pThis, true /* fBusy */);
1665 }
1666 else
1667 {
1668 /** @todo Shouldn't we just drop the packets here? There is little point in
1669 * making them accumulate when the VM is paused and it'll only waste
1670 * kernel memory anyway... Hmm. maybe wait a short while (2-5 secs)
1671 * before start draining the packets (goes for the intnet ring buf
1672 * too)? */
1673 }
1674}
1675#endif /* !VBOXNETFLT_LINUX_NO_XMIT_QUEUE */
1676
1677/**
1678 * Reports the GSO capabilities of the hardware NIC.
1679 *
1680 * @param pThis The net filter instance. The caller hold a
1681 * reference to this.
1682 */
1683static void vboxNetFltLinuxReportNicGsoCapabilities(PVBOXNETFLTINS pThis)
1684{
1685#ifdef VBOXNETFLT_WITH_GSO_XMIT_WIRE
1686 if (vboxNetFltTryRetainBusyNotDisconnected(pThis))
1687 {
1688 struct net_device *pDev;
1689 PINTNETTRUNKSWPORT pSwitchPort;
1690 unsigned int fFeatures;
1691
1692 RTSpinlockAcquire(pThis->hSpinlock);
1693
1694 pSwitchPort = pThis->pSwitchPort; /* this doesn't need to be here, but it doesn't harm. */
1695 pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
1696 if (pDev)
1697 fFeatures = pDev->features;
1698 else
1699 fFeatures = 0;
1700
1701 RTSpinlockRelease(pThis->hSpinlock);
1702
1703 if (pThis->pSwitchPort)
1704 {
1705 /* Set/update the GSO capabilities of the NIC. */
1706 uint32_t fGsoCapabilites = 0;
1707 if (fFeatures & NETIF_F_TSO)
1708 fGsoCapabilites |= RT_BIT_32(PDMNETWORKGSOTYPE_IPV4_TCP);
1709 if (fFeatures & NETIF_F_TSO6)
1710 fGsoCapabilites |= RT_BIT_32(PDMNETWORKGSOTYPE_IPV6_TCP);
1711# if 0 /** @todo GSO: Test UDP offloading (UFO) on linux. */
1712 if (fFeatures & NETIF_F_UFO)
1713 fGsoCapabilites |= RT_BIT_32(PDMNETWORKGSOTYPE_IPV4_UDP);
1714 if (fFeatures & NETIF_F_UFO)
1715 fGsoCapabilites |= RT_BIT_32(PDMNETWORKGSOTYPE_IPV6_UDP);
1716# endif
1717 Log3(("vboxNetFltLinuxReportNicGsoCapabilities: reporting wire %s%s%s%s\n",
1718 (fGsoCapabilites & RT_BIT_32(PDMNETWORKGSOTYPE_IPV4_TCP)) ? "tso " : "",
1719 (fGsoCapabilites & RT_BIT_32(PDMNETWORKGSOTYPE_IPV6_TCP)) ? "tso6 " : "",
1720 (fGsoCapabilites & RT_BIT_32(PDMNETWORKGSOTYPE_IPV4_UDP)) ? "ufo " : "",
1721 (fGsoCapabilites & RT_BIT_32(PDMNETWORKGSOTYPE_IPV6_UDP)) ? "ufo6 " : ""));
1722 pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort, fGsoCapabilites, INTNETTRUNKDIR_WIRE);
1723 }
1724
1725 vboxNetFltRelease(pThis, true /*fBusy*/);
1726 }
1727#endif /* VBOXNETFLT_WITH_GSO_XMIT_WIRE */
1728}
1729
1730/**
1731 * Helper that determines whether the host (ignoreing us) is operating the
1732 * interface in promiscuous mode or not.
1733 */
1734static bool vboxNetFltLinuxPromiscuous(PVBOXNETFLTINS pThis)
1735{
1736 bool fRc = false;
1737 struct net_device * pDev = vboxNetFltLinuxRetainNetDev(pThis);
1738 if (pDev)
1739 {
1740 fRc = !!(pDev->promiscuity - (ASMAtomicUoReadBool(&pThis->u.s.fPromiscuousSet) & 1));
1741 LogFlow(("vboxNetFltPortOsIsPromiscuous: returns %d, pDev->promiscuity=%d, fPromiscuousSet=%d\n",
1742 fRc, pDev->promiscuity, pThis->u.s.fPromiscuousSet));
1743 vboxNetFltLinuxReleaseNetDev(pThis, pDev);
1744 }
1745 return fRc;
1746}
1747
1748/**
1749 * Does this device needs link state change signaled?
1750 * Currently we need it for our own VBoxNetAdp and TAP.
1751 */
1752static bool vboxNetFltNeedsLinkState(PVBOXNETFLTINS pThis, struct net_device *pDev)
1753{
1754 if (pDev->ethtool_ops && pDev->ethtool_ops->get_drvinfo)
1755 {
1756 struct ethtool_drvinfo Info;
1757
1758 memset(&Info, 0, sizeof(Info));
1759 Info.cmd = ETHTOOL_GDRVINFO;
1760 pDev->ethtool_ops->get_drvinfo(pDev, &Info);
1761 Log3(("%s: driver=%.*s version=%.*s bus_info=%.*s\n",
1762 __FUNCTION__,
1763 sizeof(Info.driver), Info.driver,
1764 sizeof(Info.version), Info.version,
1765 sizeof(Info.bus_info), Info.bus_info));
1766
1767 if (!strncmp(Info.driver, "vboxnet", sizeof(Info.driver)))
1768 return true;
1769
1770#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) /* TAP started doing carrier */
1771 return !strncmp(Info.driver, "tun", 4)
1772 && !strncmp(Info.bus_info, "tap", 4);
1773#endif
1774 }
1775
1776 return false;
1777}
1778
1779/**
1780 * Some devices need link state change when filter attaches/detaches
1781 * since the filter is their link in a sense.
1782 */
1783static void vboxNetFltSetLinkState(PVBOXNETFLTINS pThis, struct net_device *pDev, bool fLinkUp)
1784{
1785 if (vboxNetFltNeedsLinkState(pThis, pDev))
1786 {
1787 Log3(("%s: bringing device link %s\n",
1788 __FUNCTION__, fLinkUp ? "up" : "down"));
1789 netif_tx_lock_bh(pDev);
1790 if (fLinkUp)
1791 netif_carrier_on(pDev);
1792 else
1793 netif_carrier_off(pDev);
1794 netif_tx_unlock_bh(pDev);
1795 }
1796}
1797
1798/**
1799 * Internal worker for vboxNetFltLinuxNotifierCallback.
1800 *
1801 * @returns VBox status code.
1802 * @param pThis The instance.
1803 * @param pDev The device to attach to.
1804 */
1805static int vboxNetFltLinuxAttachToInterface(PVBOXNETFLTINS pThis, struct net_device *pDev)
1806{
1807 LogFlow(("vboxNetFltLinuxAttachToInterface: pThis=%p (%s)\n", pThis, pThis->szName));
1808
1809 /*
1810 * Retain and store the device.
1811 */
1812 dev_hold(pDev);
1813
1814 RTSpinlockAcquire(pThis->hSpinlock);
1815 ASMAtomicUoWritePtr(&pThis->u.s.pDev, pDev);
1816 RTSpinlockRelease(pThis->hSpinlock);
1817
1818 Log(("vboxNetFltLinuxAttachToInterface: Device %p(%s) retained. ref=%d\n",
1819 pDev, pDev->name,
1820#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
1821 netdev_refcnt_read(pDev)
1822#else
1823 atomic_read(&pDev->refcnt)
1824#endif
1825 ));
1826 Log(("vboxNetFltLinuxAttachToInterface: Got pDev=%p pThis=%p pThis->u.s.pDev=%p\n",
1827 pDev, pThis, ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *)));
1828
1829 /* Get the mac address while we still have a valid net_device reference. */
1830 memcpy(&pThis->u.s.MacAddr, pDev->dev_addr, sizeof(pThis->u.s.MacAddr));
1831 /* Initialize MTU */
1832 pThis->u.s.cbMtu = pDev->mtu;
1833
1834 /*
1835 * Install a packet filter for this device with a protocol wildcard (ETH_P_ALL).
1836 */
1837 pThis->u.s.PacketType.type = __constant_htons(ETH_P_ALL);
1838 pThis->u.s.PacketType.dev = pDev;
1839 pThis->u.s.PacketType.func = vboxNetFltLinuxPacketHandler;
1840 dev_add_pack(&pThis->u.s.PacketType);
1841 ASMAtomicUoWriteBool(&pThis->u.s.fPacketHandler, true);
1842 Log(("vboxNetFltLinuxAttachToInterface: this=%p: Packet handler installed.\n", pThis));
1843
1844#ifdef VBOXNETFLT_WITH_HOST2WIRE_FILTER
1845 vboxNetFltLinuxHookDev(pThis, pDev);
1846#endif
1847
1848 /*
1849 * Are we the "carrier" for this device (e.g. vboxnet or tap)?
1850 */
1851 vboxNetFltSetLinkState(pThis, pDev, true);
1852
1853 /*
1854 * Set indicators that require the spinlock. Be abit paranoid about racing
1855 * the device notification handle.
1856 */
1857 RTSpinlockAcquire(pThis->hSpinlock);
1858 pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
1859 if (pDev)
1860 {
1861 ASMAtomicUoWriteBool(&pThis->fDisconnectedFromHost, false);
1862 ASMAtomicUoWriteBool(&pThis->u.s.fRegistered, true);
1863 pDev = NULL; /* don't dereference it */
1864 }
1865 RTSpinlockRelease(pThis->hSpinlock);
1866
1867 /*
1868 * If the above succeeded report GSO capabilities, if not undo and
1869 * release the device.
1870 */
1871 if (!pDev)
1872 {
1873 Assert(pThis->pSwitchPort);
1874 if (vboxNetFltTryRetainBusyNotDisconnected(pThis))
1875 {
1876 vboxNetFltLinuxReportNicGsoCapabilities(pThis);
1877 pThis->pSwitchPort->pfnReportMacAddress(pThis->pSwitchPort, &pThis->u.s.MacAddr);
1878 pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort, vboxNetFltLinuxPromiscuous(pThis));
1879 pThis->pSwitchPort->pfnReportNoPreemptDsts(pThis->pSwitchPort, INTNETTRUNKDIR_WIRE | INTNETTRUNKDIR_HOST);
1880 vboxNetFltRelease(pThis, true /*fBusy*/);
1881 }
1882 }
1883 else
1884 {
1885#ifdef VBOXNETFLT_WITH_HOST2WIRE_FILTER
1886 vboxNetFltLinuxUnhookDev(pThis, pDev);
1887#endif
1888 RTSpinlockAcquire(pThis->hSpinlock);
1889 ASMAtomicUoWriteNullPtr(&pThis->u.s.pDev);
1890 RTSpinlockRelease(pThis->hSpinlock);
1891 dev_put(pDev);
1892 Log(("vboxNetFltLinuxAttachToInterface: Device %p(%s) released. ref=%d\n",
1893 pDev, pDev->name,
1894#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
1895 netdev_refcnt_read(pDev)
1896#else
1897 atomic_read(&pDev->refcnt)
1898#endif
1899 ));
1900 }
1901
1902 LogRel(("VBoxNetFlt: attached to '%s' / %RTmac\n", pThis->szName, &pThis->u.s.MacAddr));
1903 return VINF_SUCCESS;
1904}
1905
1906
1907static int vboxNetFltLinuxUnregisterDevice(PVBOXNETFLTINS pThis, struct net_device *pDev)
1908{
1909 bool fRegistered;
1910 Assert(!pThis->fDisconnectedFromHost);
1911
1912#ifdef VBOXNETFLT_WITH_HOST2WIRE_FILTER
1913 vboxNetFltLinuxUnhookDev(pThis, pDev);
1914#endif
1915
1916 if (ASMAtomicCmpXchgBool(&pThis->u.s.fPacketHandler, false, true))
1917 {
1918 dev_remove_pack(&pThis->u.s.PacketType);
1919 Log(("vboxNetFltLinuxUnregisterDevice: this=%p: packet handler removed.\n", pThis));
1920 }
1921
1922 RTSpinlockAcquire(pThis->hSpinlock);
1923 fRegistered = ASMAtomicXchgBool(&pThis->u.s.fRegistered, false);
1924 if (fRegistered)
1925 {
1926 ASMAtomicWriteBool(&pThis->fDisconnectedFromHost, true);
1927 ASMAtomicUoWriteNullPtr(&pThis->u.s.pDev);
1928 }
1929 RTSpinlockRelease(pThis->hSpinlock);
1930
1931 if (fRegistered)
1932 {
1933#ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
1934 skb_queue_purge(&pThis->u.s.XmitQueue);
1935#endif
1936 Log(("vboxNetFltLinuxUnregisterDevice: this=%p: xmit queue purged.\n", pThis));
1937 Log(("vboxNetFltLinuxUnregisterDevice: Device %p(%s) released. ref=%d\n",
1938 pDev, pDev->name,
1939#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
1940 netdev_refcnt_read(pDev)
1941#else
1942 atomic_read(&pDev->refcnt)
1943#endif
1944 ));
1945 dev_put(pDev);
1946 }
1947
1948 return NOTIFY_OK;
1949}
1950
1951static int vboxNetFltLinuxDeviceIsUp(PVBOXNETFLTINS pThis, struct net_device *pDev)
1952{
1953 /* Check if we are not suspended and promiscuous mode has not been set. */
1954 if ( pThis->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE
1955 && !ASMAtomicUoReadBool(&pThis->u.s.fPromiscuousSet))
1956 {
1957 /* Note that there is no need for locking as the kernel got hold of the lock already. */
1958 dev_set_promiscuity(pDev, 1);
1959 ASMAtomicWriteBool(&pThis->u.s.fPromiscuousSet, true);
1960 Log(("vboxNetFltLinuxDeviceIsUp: enabled promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
1961 }
1962 else
1963 Log(("vboxNetFltLinuxDeviceIsUp: no need to enable promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
1964 return NOTIFY_OK;
1965}
1966
1967static int vboxNetFltLinuxDeviceGoingDown(PVBOXNETFLTINS pThis, struct net_device *pDev)
1968{
1969 /* Undo promiscuous mode if we has set it. */
1970 if (ASMAtomicUoReadBool(&pThis->u.s.fPromiscuousSet))
1971 {
1972 /* Note that there is no need for locking as the kernel got hold of the lock already. */
1973 dev_set_promiscuity(pDev, -1);
1974 ASMAtomicWriteBool(&pThis->u.s.fPromiscuousSet, false);
1975 Log(("vboxNetFltLinuxDeviceGoingDown: disabled promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
1976 }
1977 else
1978 Log(("vboxNetFltLinuxDeviceGoingDown: no need to disable promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
1979 return NOTIFY_OK;
1980}
1981
1982/**
1983 * Callback for listening to MTU change event.
1984 *
1985 * We need to track changes of host's inteface MTU to discard over-sized frames
1986 * coming from the internal network as they may hang the TX queue of host's
1987 * adapter.
1988 *
1989 * @returns NOTIFY_OK
1990 * @param pThis The netfilter instance.
1991 * @param pDev Pointer to device structure of host's interface.
1992 */
1993static int vboxNetFltLinuxDeviceMtuChange(PVBOXNETFLTINS pThis, struct net_device *pDev)
1994{
1995 ASMAtomicWriteU32(&pThis->u.s.cbMtu, pDev->mtu);
1996 Log(("vboxNetFltLinuxDeviceMtuChange: set MTU for %s to %d\n", pThis->szName, pDev->mtu));
1997 return NOTIFY_OK;
1998}
1999
2000#ifdef LOG_ENABLED
2001/** Stringify the NETDEV_XXX constants. */
2002static const char *vboxNetFltLinuxGetNetDevEventName(unsigned long ulEventType)
2003{
2004 const char *pszEvent = "NETDEV_<unknown>";
2005 switch (ulEventType)
2006 {
2007 case NETDEV_REGISTER: pszEvent = "NETDEV_REGISTER"; break;
2008 case NETDEV_UNREGISTER: pszEvent = "NETDEV_UNREGISTER"; break;
2009 case NETDEV_UP: pszEvent = "NETDEV_UP"; break;
2010 case NETDEV_DOWN: pszEvent = "NETDEV_DOWN"; break;
2011 case NETDEV_REBOOT: pszEvent = "NETDEV_REBOOT"; break;
2012 case NETDEV_CHANGENAME: pszEvent = "NETDEV_CHANGENAME"; break;
2013 case NETDEV_CHANGE: pszEvent = "NETDEV_CHANGE"; break;
2014 case NETDEV_CHANGEMTU: pszEvent = "NETDEV_CHANGEMTU"; break;
2015 case NETDEV_CHANGEADDR: pszEvent = "NETDEV_CHANGEADDR"; break;
2016 case NETDEV_GOING_DOWN: pszEvent = "NETDEV_GOING_DOWN"; break;
2017# ifdef NETDEV_FEAT_CHANGE
2018 case NETDEV_FEAT_CHANGE: pszEvent = "NETDEV_FEAT_CHANGE"; break;
2019# endif
2020 }
2021 return pszEvent;
2022}
2023#endif /* LOG_ENABLED */
2024
2025/**
2026 * Callback for listening to netdevice events.
2027 *
2028 * This works the rediscovery, clean up on unregistration, promiscuity on
2029 * up/down, and GSO feature changes from ethtool.
2030 *
2031 * @returns NOTIFY_OK
2032 * @param self Pointer to our notifier registration block.
2033 * @param ulEventType The event.
2034 * @param ptr Event specific, but it is usually the device it
2035 * relates to.
2036 */
2037static int vboxNetFltLinuxNotifierCallback(struct notifier_block *self, unsigned long ulEventType, void *ptr)
2038
2039{
2040 PVBOXNETFLTINS pThis = VBOX_FLT_NB_TO_INST(self);
2041 struct net_device *pMyDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
2042 struct net_device *pDev = VBOX_NETDEV_NOTIFIER_INFO_TO_DEV(ptr);
2043 int rc = NOTIFY_OK;
2044
2045 Log(("VBoxNetFlt: got event %s(0x%lx) on %s, pDev=%p pThis=%p pThis->u.s.pDev=%p\n",
2046 vboxNetFltLinuxGetNetDevEventName(ulEventType), ulEventType, pDev->name, pDev, pThis, pMyDev));
2047
2048 if (ulEventType == NETDEV_REGISTER)
2049 {
2050#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) /* cgroups/namespaces introduced */
2051# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26)
2052# define VBOX_DEV_NET(dev) dev_net(dev)
2053# define VBOX_NET_EQ(n1, n2) net_eq((n1), (n2))
2054# else
2055# define VBOX_DEV_NET(dev) ((dev)->nd_net)
2056# define VBOX_NET_EQ(n1, n2) ((n1) == (n2))
2057# endif
2058 struct net *pMyNet = current->nsproxy->net_ns;
2059 struct net *pDevNet = VBOX_DEV_NET(pDev);
2060
2061 if (VBOX_NET_EQ(pDevNet, pMyNet))
2062#endif /* namespaces */
2063 {
2064 if (strcmp(pDev->name, pThis->szName) == 0)
2065 {
2066 vboxNetFltLinuxAttachToInterface(pThis, pDev);
2067 }
2068 }
2069 }
2070 else
2071 {
2072 if (pDev == pMyDev)
2073 {
2074 switch (ulEventType)
2075 {
2076 case NETDEV_UNREGISTER:
2077 rc = vboxNetFltLinuxUnregisterDevice(pThis, pDev);
2078 break;
2079 case NETDEV_UP:
2080 rc = vboxNetFltLinuxDeviceIsUp(pThis, pDev);
2081 break;
2082 case NETDEV_GOING_DOWN:
2083 rc = vboxNetFltLinuxDeviceGoingDown(pThis, pDev);
2084 break;
2085 case NETDEV_CHANGEMTU:
2086 rc = vboxNetFltLinuxDeviceMtuChange(pThis, pDev);
2087 break;
2088 case NETDEV_CHANGENAME:
2089 break;
2090#ifdef NETDEV_FEAT_CHANGE
2091 case NETDEV_FEAT_CHANGE:
2092 vboxNetFltLinuxReportNicGsoCapabilities(pThis);
2093 break;
2094#endif
2095 }
2096 }
2097 }
2098
2099 return rc;
2100}
2101
2102/*
2103 * Initial enumeration of netdevs. Called with NETDEV_REGISTER by
2104 * register_netdevice_notifier() under rtnl lock.
2105 */
2106static int vboxNetFltLinuxEnumeratorCallback(struct notifier_block *self, unsigned long ulEventType, void *ptr)
2107{
2108 PVBOXNETFLTINS pThis = ((PVBOXNETFLTNOTIFIER)self)->pThis;
2109 struct net_device *dev = VBOX_NETDEV_NOTIFIER_INFO_TO_DEV(ptr);
2110 struct in_device *in_dev;
2111 struct inet6_dev *in6_dev;
2112
2113 if (ulEventType != NETDEV_REGISTER)
2114 return NOTIFY_OK;
2115
2116 if (RT_UNLIKELY(pThis->pSwitchPort->pfnNotifyHostAddress == NULL))
2117 return NOTIFY_OK;
2118
2119 /*
2120 * IPv4
2121 */
2122#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 14)
2123 in_dev = __in_dev_get_rtnl(dev);
2124#else
2125 in_dev = __in_dev_get(dev);
2126#endif
2127 if (in_dev != NULL)
2128 {
2129 for_ifa(in_dev) {
2130 if (VBOX_IPV4_IS_LOOPBACK(ifa->ifa_address))
2131 return NOTIFY_OK;
2132
2133 if ( dev != pThis->u.s.pDev
2134 && VBOX_IPV4_IS_LINKLOCAL_169(ifa->ifa_address))
2135 continue;
2136
2137 Log(("%s: %s: IPv4 addr %RTnaipv4 mask %RTnaipv4\n",
2138 __FUNCTION__, VBOX_NETDEV_NAME(dev),
2139 ifa->ifa_address, ifa->ifa_mask));
2140
2141 pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort,
2142 /* :fAdded */ true, kIntNetAddrType_IPv4, &ifa->ifa_address);
2143 } endfor_ifa(in_dev);
2144 }
2145
2146 /*
2147 * IPv6
2148 */
2149 in6_dev = __in6_dev_get(dev);
2150 if (in6_dev != NULL)
2151 {
2152 struct inet6_ifaddr *ifa;
2153
2154 read_lock_bh(&in6_dev->lock);
2155#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 35)
2156 list_for_each_entry(ifa, &in6_dev->addr_list, if_list)
2157#else
2158 for (ifa = in6_dev->addr_list; ifa != NULL; ifa = ifa->if_next)
2159#endif
2160 {
2161 if ( dev != pThis->u.s.pDev
2162 && ipv6_addr_type(&ifa->addr) & (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK))
2163 continue;
2164
2165 Log(("%s: %s: IPv6 addr %RTnaipv6/%u\n",
2166 __FUNCTION__, VBOX_NETDEV_NAME(dev),
2167 &ifa->addr, (unsigned)ifa->prefix_len));
2168
2169 pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort,
2170 /* :fAdded */ true, kIntNetAddrType_IPv6, &ifa->addr);
2171 }
2172 read_unlock_bh(&in6_dev->lock);
2173 }
2174
2175 return NOTIFY_OK;
2176}
2177
2178
2179static int vboxNetFltLinuxNotifierIPv4Callback(struct notifier_block *self, unsigned long ulEventType, void *ptr)
2180{
2181 PVBOXNETFLTINS pThis = RT_FROM_MEMBER(self, VBOXNETFLTINS, u.s.NotifierIPv4);
2182 struct net_device *pDev, *pEventDev;
2183 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
2184 bool fMyDev;
2185 int rc = NOTIFY_OK;
2186
2187 pDev = vboxNetFltLinuxRetainNetDev(pThis);
2188 pEventDev = ifa->ifa_dev->dev;
2189 fMyDev = (pDev == pEventDev);
2190 Log(("VBoxNetFlt: %s: IPv4 event %s(0x%lx) %s: addr %RTnaipv4 mask %RTnaipv4\n",
2191 pDev ? VBOX_NETDEV_NAME(pDev) : "<???>",
2192 vboxNetFltLinuxGetNetDevEventName(ulEventType), ulEventType,
2193 pEventDev ? VBOX_NETDEV_NAME(pEventDev) : "<???>",
2194 ifa->ifa_address, ifa->ifa_mask));
2195
2196 if (pDev != NULL)
2197 vboxNetFltLinuxReleaseNetDev(pThis, pDev);
2198
2199 if (VBOX_IPV4_IS_LOOPBACK(ifa->ifa_address))
2200 return NOTIFY_OK;
2201
2202 if ( !fMyDev
2203 && VBOX_IPV4_IS_LINKLOCAL_169(ifa->ifa_address))
2204 return NOTIFY_OK;
2205
2206 if (pThis->pSwitchPort->pfnNotifyHostAddress)
2207 {
2208 bool fAdded;
2209 if (ulEventType == NETDEV_UP)
2210 fAdded = true;
2211 else if (ulEventType == NETDEV_DOWN)
2212 fAdded = false;
2213 else
2214 return NOTIFY_OK;
2215
2216 pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort, fAdded,
2217 kIntNetAddrType_IPv4, &ifa->ifa_local);
2218 }
2219
2220 return rc;
2221}
2222
2223
2224static int vboxNetFltLinuxNotifierIPv6Callback(struct notifier_block *self, unsigned long ulEventType, void *ptr)
2225{
2226 PVBOXNETFLTINS pThis = RT_FROM_MEMBER(self, VBOXNETFLTINS, u.s.NotifierIPv6);
2227 struct net_device *pDev, *pEventDev;
2228 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
2229 bool fMyDev;
2230 int rc = NOTIFY_OK;
2231
2232 pDev = vboxNetFltLinuxRetainNetDev(pThis);
2233 pEventDev = ifa->idev->dev;
2234 fMyDev = (pDev == pEventDev);
2235 Log(("VBoxNetFlt: %s: IPv6 event %s(0x%lx) %s: %RTnaipv6\n",
2236 pDev ? VBOX_NETDEV_NAME(pDev) : "<???>",
2237 vboxNetFltLinuxGetNetDevEventName(ulEventType), ulEventType,
2238 pEventDev ? VBOX_NETDEV_NAME(pEventDev) : "<???>",
2239 &ifa->addr));
2240
2241 if (pDev != NULL)
2242 vboxNetFltLinuxReleaseNetDev(pThis, pDev);
2243
2244 if ( !fMyDev
2245 && ipv6_addr_type(&ifa->addr) & (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK))
2246 return NOTIFY_OK;
2247
2248 if (pThis->pSwitchPort->pfnNotifyHostAddress)
2249 {
2250 bool fAdded;
2251 if (ulEventType == NETDEV_UP)
2252 fAdded = true;
2253 else if (ulEventType == NETDEV_DOWN)
2254 fAdded = false;
2255 else
2256 return NOTIFY_OK;
2257
2258 pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort, fAdded,
2259 kIntNetAddrType_IPv6, &ifa->addr);
2260 }
2261
2262 return rc;
2263}
2264
2265
2266bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis)
2267{
2268 return !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
2269}
2270
2271int vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
2272{
2273 struct net_device * pDev;
2274 int err;
2275 int rc = VINF_SUCCESS;
2276 IPRT_LINUX_SAVE_EFL_AC();
2277 NOREF(pvIfData);
2278
2279 LogFlow(("vboxNetFltPortOsXmit: pThis=%p (%s)\n", pThis, pThis->szName));
2280
2281 pDev = vboxNetFltLinuxRetainNetDev(pThis);
2282 if (pDev)
2283 {
2284 /*
2285 * Create a sk_buff for the gather list and push it onto the wire.
2286 */
2287 if (fDst & INTNETTRUNKDIR_WIRE)
2288 {
2289 struct sk_buff *pBuf = vboxNetFltLinuxSkBufFromSG(pThis, pSG, true);
2290 if (pBuf)
2291 {
2292 vboxNetFltDumpPacket(pSG, true, "wire", 1);
2293 Log6(("vboxNetFltPortOsXmit: pBuf->cb dump:\n%.*Rhxd\n", sizeof(pBuf->cb), pBuf->cb));
2294 Log6(("vboxNetFltPortOsXmit: dev_queue_xmit(%p)\n", pBuf));
2295 err = dev_queue_xmit(pBuf);
2296 if (err)
2297 rc = RTErrConvertFromErrno(err);
2298 }
2299 else
2300 rc = VERR_NO_MEMORY;
2301 }
2302
2303 /*
2304 * Create a sk_buff for the gather list and push it onto the host stack.
2305 */
2306 if (fDst & INTNETTRUNKDIR_HOST)
2307 {
2308 struct sk_buff *pBuf = vboxNetFltLinuxSkBufFromSG(pThis, pSG, false);
2309 if (pBuf)
2310 {
2311 vboxNetFltDumpPacket(pSG, true, "host", (fDst & INTNETTRUNKDIR_WIRE) ? 0 : 1);
2312 Log6(("vboxNetFltPortOsXmit: pBuf->cb dump:\n%.*Rhxd\n", sizeof(pBuf->cb), pBuf->cb));
2313 Log6(("vboxNetFltPortOsXmit: netif_rx_ni(%p)\n", pBuf));
2314 err = netif_rx_ni(pBuf);
2315 if (err)
2316 rc = RTErrConvertFromErrno(err);
2317 }
2318 else
2319 rc = VERR_NO_MEMORY;
2320 }
2321
2322 vboxNetFltLinuxReleaseNetDev(pThis, pDev);
2323 }
2324
2325 IPRT_LINUX_RESTORE_EFL_AC();
2326 return rc;
2327}
2328
2329
2330void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive)
2331{
2332 struct net_device *pDev;
2333 IPRT_LINUX_SAVE_EFL_AC();
2334
2335 LogFlow(("vboxNetFltPortOsSetActive: pThis=%p (%s), fActive=%RTbool, fDisablePromiscuous=%RTbool\n",
2336 pThis, pThis->szName, fActive, pThis->fDisablePromiscuous));
2337
2338 if (pThis->fDisablePromiscuous)
2339 return;
2340
2341 pDev = vboxNetFltLinuxRetainNetDev(pThis);
2342 if (pDev)
2343 {
2344 /*
2345 * This api is a bit weird, the best reference is the code.
2346 *
2347 * Also, we have a bit or race conditions wrt the maintenance of
2348 * host the interface promiscuity for vboxNetFltPortOsIsPromiscuous.
2349 */
2350#ifdef LOG_ENABLED
2351 u_int16_t fIf;
2352 unsigned const cPromiscBefore = pDev->promiscuity;
2353#endif
2354 if (fActive)
2355 {
2356 Assert(!pThis->u.s.fPromiscuousSet);
2357
2358 rtnl_lock();
2359 dev_set_promiscuity(pDev, 1);
2360 rtnl_unlock();
2361 pThis->u.s.fPromiscuousSet = true;
2362 Log(("vboxNetFltPortOsSetActive: enabled promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
2363 }
2364 else
2365 {
2366 if (pThis->u.s.fPromiscuousSet)
2367 {
2368 rtnl_lock();
2369 dev_set_promiscuity(pDev, -1);
2370 rtnl_unlock();
2371 Log(("vboxNetFltPortOsSetActive: disabled promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
2372 }
2373 pThis->u.s.fPromiscuousSet = false;
2374
2375#ifdef LOG_ENABLED
2376 fIf = dev_get_flags(pDev);
2377 Log(("VBoxNetFlt: fIf=%#x; %d->%d\n", fIf, cPromiscBefore, pDev->promiscuity));
2378#endif
2379 }
2380
2381 vboxNetFltLinuxReleaseNetDev(pThis, pDev);
2382 }
2383 IPRT_LINUX_RESTORE_EFL_AC();
2384}
2385
2386
2387int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis)
2388{
2389 /*
2390 * Remove packet handler when we get disconnected from internal switch as
2391 * we don't want the handler to forward packets to disconnected switch.
2392 */
2393 if (ASMAtomicCmpXchgBool(&pThis->u.s.fPacketHandler, false, true))
2394 {
2395 IPRT_LINUX_SAVE_EFL_AC();
2396 dev_remove_pack(&pThis->u.s.PacketType);
2397 Log(("vboxNetFltOsDisconnectIt: this=%p: Packet handler removed.\n", pThis));
2398 IPRT_LINUX_RESTORE_EFL_AC();
2399 }
2400 return VINF_SUCCESS;
2401}
2402
2403
2404int vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis)
2405{
2406 IPRT_LINUX_SAVE_EFL_AC();
2407
2408 /*
2409 * Report the GSO capabilities of the host and device (if connected).
2410 * Note! No need to mark ourselves busy here.
2411 */
2412 /** @todo duplicate work here now? Attach */
2413#if defined(VBOXNETFLT_WITH_GSO_XMIT_HOST)
2414 Log3(("vboxNetFltOsConnectIt: reporting host tso tso6 ufo\n"));
2415 pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort,
2416 0
2417 | RT_BIT_32(PDMNETWORKGSOTYPE_IPV4_TCP)
2418 | RT_BIT_32(PDMNETWORKGSOTYPE_IPV6_TCP)
2419 | RT_BIT_32(PDMNETWORKGSOTYPE_IPV4_UDP)
2420# if 0 /** @todo GSO: Test UDP offloading (UFO) on linux. */
2421 | RT_BIT_32(PDMNETWORKGSOTYPE_IPV6_UDP)
2422# endif
2423 , INTNETTRUNKDIR_HOST);
2424
2425#endif
2426 vboxNetFltLinuxReportNicGsoCapabilities(pThis);
2427
2428 IPRT_LINUX_RESTORE_EFL_AC();
2429 return VINF_SUCCESS;
2430}
2431
2432
2433void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis)
2434{
2435 struct net_device *pDev;
2436 bool fRegistered;
2437 IPRT_LINUX_SAVE_EFL_AC();
2438
2439#ifdef VBOXNETFLT_WITH_HOST2WIRE_FILTER
2440 vboxNetFltLinuxUnhookDev(pThis, NULL);
2441#endif
2442
2443 /** @todo This code may race vboxNetFltLinuxUnregisterDevice (very very
2444 * unlikely, but none the less). Since it doesn't actually update the
2445 * state (just reads it), it is likely to panic in some interesting
2446 * ways. */
2447
2448 RTSpinlockAcquire(pThis->hSpinlock);
2449 pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
2450 fRegistered = ASMAtomicXchgBool(&pThis->u.s.fRegistered, false);
2451 RTSpinlockRelease(pThis->hSpinlock);
2452
2453 if (fRegistered)
2454 {
2455 vboxNetFltSetLinkState(pThis, pDev, false);
2456
2457#ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
2458 skb_queue_purge(&pThis->u.s.XmitQueue);
2459#endif
2460 Log(("vboxNetFltOsDeleteInstance: this=%p: xmit queue purged.\n", pThis));
2461 Log(("vboxNetFltOsDeleteInstance: Device %p(%s) released. ref=%d\n",
2462 pDev, pDev->name,
2463#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
2464 netdev_refcnt_read(pDev)
2465#else
2466 atomic_read(&pDev->refcnt)
2467#endif
2468 ));
2469 dev_put(pDev);
2470 }
2471
2472 unregister_inet6addr_notifier(&pThis->u.s.NotifierIPv6);
2473 unregister_inetaddr_notifier(&pThis->u.s.NotifierIPv4);
2474
2475 Log(("vboxNetFltOsDeleteInstance: this=%p: Notifier removed.\n", pThis));
2476 unregister_netdevice_notifier(&pThis->u.s.Notifier);
2477 module_put(THIS_MODULE);
2478
2479 IPRT_LINUX_RESTORE_EFL_AC();
2480}
2481
2482
2483int vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext)
2484{
2485 int err;
2486 IPRT_LINUX_SAVE_EFL_AC();
2487 NOREF(pvContext);
2488
2489 pThis->u.s.Notifier.notifier_call = vboxNetFltLinuxNotifierCallback;
2490 err = register_netdevice_notifier(&pThis->u.s.Notifier);
2491 if (err)
2492 {
2493 IPRT_LINUX_RESTORE_EFL_AC();
2494 return VERR_INTNET_FLT_IF_FAILED;
2495 }
2496 if (!pThis->u.s.fRegistered)
2497 {
2498 unregister_netdevice_notifier(&pThis->u.s.Notifier);
2499 LogRel(("VBoxNetFlt: failed to find %s.\n", pThis->szName));
2500 IPRT_LINUX_RESTORE_EFL_AC();
2501 return VERR_INTNET_FLT_IF_NOT_FOUND;
2502 }
2503
2504 Log(("vboxNetFltOsInitInstance: this=%p: Notifier installed.\n", pThis));
2505 if ( pThis->fDisconnectedFromHost
2506 || !try_module_get(THIS_MODULE))
2507 {
2508 IPRT_LINUX_RESTORE_EFL_AC();
2509 return VERR_INTNET_FLT_IF_FAILED;
2510 }
2511
2512 if (pThis->pSwitchPort->pfnNotifyHostAddress)
2513 {
2514 VBOXNETFLTNOTIFIER Enumerator;
2515
2516 /*
2517 * register_inetaddr_notifier() and register_inet6addr_notifier()
2518 * do not call the callback for existing devices. Enumerating
2519 * all network devices explicitly is a bit of an ifdef mess,
2520 * so co-opt register_netdevice_notifier() to do that for us.
2521 */
2522 RT_ZERO(Enumerator);
2523 Enumerator.Notifier.notifier_call = vboxNetFltLinuxEnumeratorCallback;
2524 Enumerator.pThis = pThis;
2525
2526 err = register_netdevice_notifier(&Enumerator.Notifier);
2527 if (err)
2528 {
2529 LogRel(("%s: failed to enumerate network devices: error %d\n", __FUNCTION__, err));
2530 IPRT_LINUX_RESTORE_EFL_AC();
2531 return VINF_SUCCESS;
2532 }
2533
2534 unregister_netdevice_notifier(&Enumerator.Notifier);
2535
2536 pThis->u.s.NotifierIPv4.notifier_call = vboxNetFltLinuxNotifierIPv4Callback;
2537 err = register_inetaddr_notifier(&pThis->u.s.NotifierIPv4);
2538 if (err)
2539 LogRel(("%s: failed to register IPv4 notifier: error %d\n", __FUNCTION__, err));
2540
2541 pThis->u.s.NotifierIPv6.notifier_call = vboxNetFltLinuxNotifierIPv6Callback;
2542 err = register_inet6addr_notifier(&pThis->u.s.NotifierIPv6);
2543 if (err)
2544 LogRel(("%s: failed to register IPv6 notifier: error %d\n", __FUNCTION__, err));
2545 }
2546
2547 IPRT_LINUX_RESTORE_EFL_AC();
2548 return VINF_SUCCESS;
2549}
2550
2551int vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis)
2552{
2553 IPRT_LINUX_SAVE_EFL_AC();
2554
2555 /*
2556 * Init the linux specific members.
2557 */
2558 ASMAtomicUoWriteNullPtr(&pThis->u.s.pDev);
2559 pThis->u.s.fRegistered = false;
2560 pThis->u.s.fPromiscuousSet = false;
2561 pThis->u.s.fPacketHandler = false;
2562 memset(&pThis->u.s.PacketType, 0, sizeof(pThis->u.s.PacketType));
2563#ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
2564 skb_queue_head_init(&pThis->u.s.XmitQueue);
2565# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
2566 INIT_WORK(&pThis->u.s.XmitTask, vboxNetFltLinuxXmitTask);
2567# else
2568 INIT_WORK(&pThis->u.s.XmitTask, vboxNetFltLinuxXmitTask, &pThis->u.s.XmitTask);
2569# endif
2570#endif
2571
2572 IPRT_LINUX_RESTORE_EFL_AC();
2573 return VINF_SUCCESS;
2574}
2575
2576
2577void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac)
2578{
2579 NOREF(pThis); NOREF(pvIfData); NOREF(pMac);
2580}
2581
2582
2583int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void *pvIf, void **pvIfData)
2584{
2585 /* Nothing to do */
2586 NOREF(pThis); NOREF(pvIf); NOREF(pvIfData);
2587 return VINF_SUCCESS;
2588}
2589
2590
2591int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData)
2592{
2593 /* Nothing to do */
2594 NOREF(pThis); NOREF(pvIfData);
2595 return VINF_SUCCESS;
2596}
2597
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