/* $Id: VBoxNetFlt-darwin.cpp 44528 2013-02-04 14:27:54Z vboxsync $ */ /** @file * VBoxNetFlt - Network Filter Driver (Host), Darwin Specific Code. */ /* * Copyright (C) 2006-2012 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ /******************************************************************************* * Header Files * *******************************************************************************/ /* * Deal with conflicts first. * PVM - BSD mess, that FreeBSD has correct a long time ago. * iprt/types.h before sys/param.h - prevents UINT32_C and friends. */ #include #include #undef PVM #include /* Assert as function */ #define LOG_GROUP LOG_GROUP_NET_FLT_DRV #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include RT_C_DECLS_BEGIN /* Buggy 10.4 headers, fixed in 10.5. */ #include #include RT_C_DECLS_END #include #define VBOXNETFLT_OS_SPECFIC 1 #include "../VBoxNetFltInternal.h" /******************************************************************************* * Defined Constants And Macros * *******************************************************************************/ /** The maximum number of SG segments. * Used to prevent stack overflow and similar bad stuff. */ #define VBOXNETFLT_DARWIN_MAX_SEGS 32 #if 0 /** For testing extremely segmented frames. */ #define VBOXNETFLT_DARWIN_TEST_SEG_SIZE 14 #endif /******************************************************************************* * Internal Functions * *******************************************************************************/ RT_C_DECLS_BEGIN static kern_return_t VBoxNetFltDarwinStart(struct kmod_info *pKModInfo, void *pvData); static kern_return_t VBoxNetFltDarwinStop(struct kmod_info *pKModInfo, void *pvData); RT_C_DECLS_END /******************************************************************************* * Structures and Typedefs * *******************************************************************************/ /** * The mbuf tag data. * * We have to associate the ethernet header with each packet we're sending * because things like icmp will inherit the tag it self so the tag along * isn't sufficient to identify our mbufs. For the icmp scenario the ethernet * header naturally changes before the packet is send pack, so let check it. */ typedef struct VBOXNETFLTTAG { /** The ethernet header of the outgoing frame. */ RTNETETHERHDR EthHdr; } VBOXNETFLTTAG; /** Pointer to a VBoxNetFlt mbuf tag. */ typedef VBOXNETFLTTAG *PVBOXNETFLTTAG; /** Pointer to a const VBoxNetFlt mbuf tag. */ typedef VBOXNETFLTTAG const *PCVBOXNETFLTTAG; /******************************************************************************* * Global Variables * *******************************************************************************/ /** * Declare the module stuff. */ RT_C_DECLS_BEGIN extern kern_return_t _start(struct kmod_info *pKModInfo, void *pvData); extern kern_return_t _stop(struct kmod_info *pKModInfo, void *pvData); KMOD_EXPLICIT_DECL(VBoxNetFlt, VBOX_VERSION_STRING, _start, _stop) DECLHIDDEN(kmod_start_func_t *) _realmain = VBoxNetFltDarwinStart; DECLHIDDEN(kmod_stop_func_t *) _antimain = VBoxNetFltDarwinStop; DECLHIDDEN(int) _kext_apple_cc = __APPLE_CC__; RT_C_DECLS_END /** * The (common) global data. */ static VBOXNETFLTGLOBALS g_VBoxNetFltGlobals; /** The unique tag id for this module. * This is basically a unique string hash that lives on until reboot. * It is used for tagging mbufs. */ static mbuf_tag_id_t g_idTag; /** the offset of the struct ifnet::if_pcount variable. */ static unsigned g_offIfNetPCount = sizeof(void *) * (1 /*if_softc*/ + 1 /*if_name*/ + 2 /*if_link*/ + 2 /*if_addrhead*/ + 1 /*if_check_multi*/) + sizeof(u_long) /*if_refcnt*/; /** Macro for accessing ifnet::if_pcount. */ #define VBOX_GET_PCOUNT(pIfNet) ( *(int *)((uintptr_t)pIfNet + g_offIfNetPCount) ) /** * Start the kernel module. */ static kern_return_t VBoxNetFltDarwinStart(struct kmod_info *pKModInfo, void *pvData) { int rc; /* * Initialize IPRT and find our module tag id. * (IPRT is shared with VBoxDrv, it creates the loggers.) */ rc = RTR0Init(0); if (RT_SUCCESS(rc)) { Log(("VBoxNetFltDarwinStart\n")); errno_t err = mbuf_tag_id_find("org.VirtualBox.kext.VBoxFltDrv", &g_idTag); if (!err) { /* * Initialize the globals and connect to the support driver. * * This will call back vboxNetFltOsOpenSupDrv (and maybe vboxNetFltOsCloseSupDrv) * for establishing the connect to the support driver. */ memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals)); rc = vboxNetFltInitGlobalsAndIdc(&g_VBoxNetFltGlobals); if (RT_SUCCESS(rc)) { LogRel(("VBoxFltDrv: version " VBOX_VERSION_STRING " r%d\n", VBOX_SVN_REV)); return KMOD_RETURN_SUCCESS; } LogRel(("VBoxFltDrv: failed to initialize device extension (rc=%d)\n", rc)); } else LogRel(("VBoxFltDrv: mbuf_tag_id_find failed, err=%d\n", err)); RTR0Term(); } else printf("VBoxFltDrv: failed to initialize IPRT (rc=%d)\n", rc); memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals)); return KMOD_RETURN_FAILURE; } /** * Stop the kernel module. */ static kern_return_t VBoxNetFltDarwinStop(struct kmod_info *pKModInfo, void *pvData) { Log(("VBoxNetFltDarwinStop\n")); /* * Refuse to unload if anyone is currently using the filter driver. * This is important as I/O kit / xnu will to be able to do usage * tracking for us! */ int rc = vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltGlobals); if (RT_FAILURE(rc)) { Log(("VBoxNetFltDarwinStop - failed, busy.\n")); return KMOD_RETURN_FAILURE; } /* * Undo the work done during start (in reverse order). */ memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals)); RTR0Term(); return KMOD_RETURN_SUCCESS; } /** * Reads and retains the host interface handle. * * @returns The handle, NULL if detached. * @param pThis */ DECLINLINE(ifnet_t) vboxNetFltDarwinRetainIfNet(PVBOXNETFLTINS pThis) { ifnet_t pIfNet = NULL; /* * Be careful here to avoid problems racing the detached callback. */ RTSpinlockAcquire(pThis->hSpinlock); if (!ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost)) { pIfNet = ASMAtomicUoReadPtrT(&pThis->u.s.pIfNet, ifnet_t); if (pIfNet) ifnet_reference(pIfNet); } RTSpinlockReleaseNoInts(pThis->hSpinlock); return pIfNet; } /** * Release the host interface handle previously retained * by vboxNetFltDarwinRetainIfNet. * * @param pThis The instance. * @param pIfNet The vboxNetFltDarwinRetainIfNet return value, NULL is fine. */ DECLINLINE(void) vboxNetFltDarwinReleaseIfNet(PVBOXNETFLTINS pThis, ifnet_t pIfNet) { NOREF(pThis); if (pIfNet) ifnet_release(pIfNet); } /** * Checks whether this is an mbuf created by vboxNetFltDarwinMBufFromSG, * i.e. a buffer which we're pushing and should be ignored by the filter callbacks. * * @returns true / false accordingly. * @param pThis The instance. * @param pMBuf The mbuf. * @param pvFrame The frame pointer, optional. */ DECLINLINE(bool) vboxNetFltDarwinMBufIsOur(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame) { NOREF(pThis); /* * Lookup the tag set by vboxNetFltDarwinMBufFromSG. */ PCVBOXNETFLTTAG pTagData; size_t cbTagData; errno_t err = mbuf_tag_find(pMBuf, g_idTag, 0 /* type */, &cbTagData, (void **)&pTagData); if (err) return false; AssertReturn(cbTagData == sizeof(*pTagData), false); /* * Dig out the ethernet header from the mbuf. */ PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pvFrame; if (!pEthHdr) pEthHdr = (PCRTNETETHERHDR)mbuf_pkthdr_header(pMBuf); if (!pEthHdr) pEthHdr = (PCRTNETETHERHDR)mbuf_data(pMBuf); /* ASSUMING that there is enough data to work on! */ if ( pEthHdr->DstMac.au8[0] != pTagData->EthHdr.DstMac.au8[0] || pEthHdr->DstMac.au8[1] != pTagData->EthHdr.DstMac.au8[1] || pEthHdr->DstMac.au8[2] != pTagData->EthHdr.DstMac.au8[2] || pEthHdr->DstMac.au8[3] != pTagData->EthHdr.DstMac.au8[3] || pEthHdr->DstMac.au8[4] != pTagData->EthHdr.DstMac.au8[4] || pEthHdr->DstMac.au8[5] != pTagData->EthHdr.DstMac.au8[5] || pEthHdr->SrcMac.au8[0] != pTagData->EthHdr.SrcMac.au8[0] || pEthHdr->SrcMac.au8[1] != pTagData->EthHdr.SrcMac.au8[1] || pEthHdr->SrcMac.au8[2] != pTagData->EthHdr.SrcMac.au8[2] || pEthHdr->SrcMac.au8[3] != pTagData->EthHdr.SrcMac.au8[3] || pEthHdr->SrcMac.au8[4] != pTagData->EthHdr.SrcMac.au8[4] || pEthHdr->SrcMac.au8[5] != pTagData->EthHdr.SrcMac.au8[5] || pEthHdr->EtherType != pTagData->EthHdr.EtherType) { Log3(("tagged, but the ethernet header has changed\n")); return false; } return true; } /** * Internal worker that create a darwin mbuf for a (scatter/)gather list. * * @returns Pointer to the mbuf. * @param pThis The instance. * @param pSG The (scatter/)gather list. */ static mbuf_t vboxNetFltDarwinMBufFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG) { /// @todo future? mbuf_how_t How = preemption enabled ? MBUF_DONTWAIT : MBUF_WAITOK; mbuf_how_t How = MBUF_WAITOK; /* * We need some way of getting back to our instance data when * the mbuf is freed, so use pvUserData for this. * -- this is not relevant anylonger! -- */ Assert(!pSG->pvUserData || pSG->pvUserData == pThis); Assert(!pSG->pvUserData2); pSG->pvUserData = pThis; /* * Allocate a packet and copy over the data. * * Using mbuf_attachcluster() here would've been nice but there are two * issues with it: (1) it's 10.5.x only, and (2) the documentation indicates * that it's not supposed to be used for really external buffers. The 2nd * point might be argued against considering that the only m_clattach user * is mallocs memory for the ext mbuf and not doing what's stated in the docs. * However, it's hard to tell if these m_clattach buffers actually makes it * to the NICs or not, and even if they did, the NIC would need the physical * addresses for the pages they contain and might end up copying the data * to a new mbuf anyway. * * So, in the end it's better to just do it the simple way that will work * 100%, even if it involves some extra work (alloc + copy) we really wished * to avoid. * * Note. We can't make use of the physical addresses on darwin because the * way the mbuf / cluster stuff works (see mbuf_data_to_physical and * mcl_to_paddr). */ mbuf_t pPkt = NULL; errno_t err = mbuf_allocpacket(How, pSG->cbTotal, NULL, &pPkt); if (!err) { /* Skip zero sized memory buffers (paranoia). */ mbuf_t pCur = pPkt; while (pCur && !mbuf_maxlen(pCur)) pCur = mbuf_next(pCur); Assert(pCur); /* Set the required packet header attributes. */ mbuf_pkthdr_setlen(pPkt, pSG->cbTotal); mbuf_pkthdr_setheader(pPkt, mbuf_data(pCur)); /* Special case the single buffer copy. */ if ( mbuf_next(pCur) && mbuf_maxlen(pCur) >= pSG->cbTotal) { mbuf_setlen(pCur, pSG->cbTotal); IntNetSgRead(pSG, mbuf_data(pCur)); } else { /* Multi buffer copying. */ size_t cbLeft = pSG->cbTotal; size_t offSrc = 0; while (cbLeft > 0 && pCur) { size_t cb = mbuf_maxlen(pCur); if (cb > cbLeft) cb = cbLeft; mbuf_setlen(pCur, cb); IntNetSgReadEx(pSG, offSrc, cb, mbuf_data(pCur)); /* advance */ offSrc += cb; cbLeft -= cb; pCur = mbuf_next(pCur); } Assert(cbLeft == 0); } if (!err) { /* * Tag the packet and return successfully. */ PVBOXNETFLTTAG pTagData; err = mbuf_tag_allocate(pPkt, g_idTag, 0 /* type */, sizeof(VBOXNETFLTTAG) /* tag len */, How, (void **)&pTagData); if (!err) { Assert(pSG->aSegs[0].cb >= sizeof(pTagData->EthHdr)); memcpy(&pTagData->EthHdr, pSG->aSegs[0].pv, sizeof(pTagData->EthHdr)); return pPkt; } /* bailout: */ AssertMsg(err == ENOMEM || err == EWOULDBLOCK, ("err=%d\n", err)); } mbuf_freem(pPkt); } else AssertMsg(err == ENOMEM || err == EWOULDBLOCK, ("err=%d\n", err)); pSG->pvUserData = NULL; return NULL; } /** * Calculates the number of segments required to represent the mbuf. * * @returns Number of segments. * @param pThis The instance. * @param pMBuf The mbuf. * @param pvFrame The frame pointer, optional. */ DECLINLINE(unsigned) vboxNetFltDarwinMBufCalcSGSegs(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame) { NOREF(pThis); /* * Count the buffers in the chain. */ unsigned cSegs = 0; for (mbuf_t pCur = pMBuf; pCur; pCur = mbuf_next(pCur)) if (mbuf_len(pCur)) cSegs++; else if ( !cSegs && pvFrame && (uintptr_t)pvFrame - (uintptr_t)mbuf_datastart(pMBuf) < mbuf_maxlen(pMBuf)) cSegs++; #ifdef PADD_RUNT_FRAMES_FROM_HOST /* * Add one buffer if the total is less than the ethernet minimum 60 bytes. * This may allocate a segment too much if the ethernet header is separated, * but that shouldn't harm us much. */ if (mbuf_pkthdr_len(pMBuf) < 60) cSegs++; #endif #ifdef VBOXNETFLT_DARWIN_TEST_SEG_SIZE /* maximize the number of segments. */ cSegs = RT_MAX(VBOXNETFLT_DARWIN_MAX_SEGS - 1, cSegs); #endif return cSegs ? cSegs : 1; } /** * Initializes a SG list from an mbuf. * * @returns Number of segments. * @param pThis The instance. * @param pMBuf The mbuf. * @param pSG The SG. * @param pvFrame The frame pointer, optional. * @param cSegs The number of segments allocated for the SG. * This should match the number in the mbuf exactly! * @param fSrc The source of the frame. */ DECLINLINE(void) vboxNetFltDarwinMBufToSG(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame, PINTNETSG pSG, unsigned cSegs, uint32_t fSrc) { NOREF(pThis); /* * Walk the chain and convert the buffers to segments. Works INTNETSG::cbTotal. */ unsigned iSeg = 0; IntNetSgInitTempSegs(pSG, 0 /*cbTotal*/, cSegs, 0 /*cSegsUsed*/); for (mbuf_t pCur = pMBuf; pCur; pCur = mbuf_next(pCur)) { size_t cbSeg = mbuf_len(pCur); if (cbSeg) { void *pvSeg = mbuf_data(pCur); /* deal with pvFrame */ if (!iSeg && pvFrame && pvFrame != pvSeg) { void *pvStart = mbuf_datastart(pMBuf); uintptr_t offSeg = (uintptr_t)pvSeg - (uintptr_t)pvStart; uintptr_t offSegEnd = offSeg + cbSeg; Assert(pvStart && pvSeg && offSeg < mbuf_maxlen(pMBuf) && offSegEnd <= mbuf_maxlen(pMBuf)); NOREF(offSegEnd); uintptr_t offFrame = (uintptr_t)pvFrame - (uintptr_t)pvStart; if (RT_LIKELY(offFrame < offSeg)) { pvSeg = pvFrame; cbSeg += offSeg - offFrame; } else AssertMsgFailed(("pvFrame=%p pvStart=%p pvSeg=%p offSeg=%p cbSeg=%#zx offSegEnd=%p offFrame=%p maxlen=%#zx\n", pvFrame, pvStart, pvSeg, offSeg, cbSeg, offSegEnd, offFrame, mbuf_maxlen(pMBuf))); pvFrame = NULL; } AssertBreak(iSeg < cSegs); pSG->cbTotal += cbSeg; pSG->aSegs[iSeg].cb = cbSeg; pSG->aSegs[iSeg].pv = pvSeg; pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS; iSeg++; } /* The pvFrame might be in a now empty buffer. */ else if ( !iSeg && pvFrame && (uintptr_t)pvFrame - (uintptr_t)mbuf_datastart(pMBuf) < mbuf_maxlen(pMBuf)) { cbSeg = (uintptr_t)mbuf_datastart(pMBuf) + mbuf_maxlen(pMBuf) - (uintptr_t)pvFrame; pSG->cbTotal += cbSeg; pSG->aSegs[iSeg].cb = cbSeg; pSG->aSegs[iSeg].pv = pvFrame; pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS; iSeg++; pvFrame = NULL; } } Assert(iSeg && iSeg <= cSegs); pSG->cSegsUsed = iSeg; #ifdef PADD_RUNT_FRAMES_FROM_HOST /* * Add a trailer if the frame is too small. * * Since we're getting to the packet before it is framed, it has not * yet been padded. The current solution is to add a segment pointing * to a buffer containing all zeros and pray that works for all frames... */ if (pSG->cbTotal < 60 && (fSrc & INTNETTRUNKDIR_HOST)) { AssertReturnVoid(iSeg < cSegs); static uint8_t const s_abZero[128] = {0}; pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS; pSG->aSegs[iSeg].pv = (void *)&s_abZero[0]; pSG->aSegs[iSeg].cb = 60 - pSG->cbTotal; pSG->cbTotal = 60; pSG->cSegsUsed++; } #endif #ifdef VBOXNETFLT_DARWIN_TEST_SEG_SIZE /* * Redistribute the segments. */ if (pSG->cSegsUsed < pSG->cSegsAlloc) { /* copy the segments to the end. */ int iSrc = pSG->cSegsUsed; int iDst = pSG->cSegsAlloc; while (iSrc > 0) { iDst--; iSrc--; pSG->aSegs[iDst] = pSG->aSegs[iSrc]; } /* create small segments from the start. */ pSG->cSegsUsed = pSG->cSegsAlloc; iSrc = iDst; iDst = 0; while ( iDst < iSrc && iDst < pSG->cSegsAlloc) { pSG->aSegs[iDst].Phys = NIL_RTHCPHYS; pSG->aSegs[iDst].pv = pSG->aSegs[iSrc].pv; pSG->aSegs[iDst].cb = RT_MIN(pSG->aSegs[iSrc].cb, VBOXNETFLT_DARWIN_TEST_SEG_SIZE); if (pSG->aSegs[iDst].cb != pSG->aSegs[iSrc].cb) { pSG->aSegs[iSrc].cb -= pSG->aSegs[iDst].cb; pSG->aSegs[iSrc].pv = (uint8_t *)pSG->aSegs[iSrc].pv + pSG->aSegs[iDst].cb; } else if (++iSrc >= pSG->cSegsAlloc) { pSG->cSegsUsed = iDst + 1; break; } iDst++; } } #endif AssertMsg(!pvFrame, ("pvFrame=%p pMBuf=%p iSeg=%d\n", pvFrame, pMBuf, iSeg)); } /** * Helper for determining whether the host wants the interface to be * promiscuous. */ static bool vboxNetFltDarwinIsPromiscuous(PVBOXNETFLTINS pThis) { bool fRc = false; ifnet_t pIfNet = vboxNetFltDarwinRetainIfNet(pThis); if (pIfNet) { /* gather the data */ uint16_t fIf = ifnet_flags(pIfNet); unsigned cPromisc = VBOX_GET_PCOUNT(pIfNet); bool fSetPromiscuous = ASMAtomicUoReadBool(&pThis->u.s.fSetPromiscuous); vboxNetFltDarwinReleaseIfNet(pThis, pIfNet); /* calc the return. */ fRc = (fIf & IFF_PROMISC) && cPromisc > fSetPromiscuous; } return fRc; } /** * * @see iff_detached_func in the darwin kpi. */ static void vboxNetFltDarwinIffDetached(void *pvThis, ifnet_t pIfNet) { PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvThis; uint64_t NanoTS = RTTimeSystemNanoTS(); LogFlow(("vboxNetFltDarwinIffDetached: pThis=%p NanoTS=%RU64 (%d)\n", pThis, NanoTS, VALID_PTR(pIfNet) ? VBOX_GET_PCOUNT(pIfNet) : -1)); Assert(!pThis->fDisconnectedFromHost); Assert(!pThis->fRediscoveryPending); /* * If we've put it into promiscuous mode, undo that now. If we don't * the if_pcount will go all wrong when it's replugged. */ if (ASMAtomicXchgBool(&pThis->u.s.fSetPromiscuous, false)) ifnet_set_promiscuous(pIfNet, 0); /* * We carefully take the spinlock and increase the interface reference * behind it in order to avoid problematic races with the detached callback. */ RTSpinlockAcquire(pThis->hSpinlock); pIfNet = ASMAtomicUoReadPtrT(&pThis->u.s.pIfNet, ifnet_t); int cPromisc = VALID_PTR(pIfNet) ? VBOX_GET_PCOUNT(pIfNet) : - 1; ASMAtomicUoWriteNullPtr(&pThis->u.s.pIfNet); ASMAtomicUoWriteNullPtr(&pThis->u.s.pIfFilter); ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false); pThis->u.s.fSetPromiscuous = false; ASMAtomicUoWriteU64(&pThis->NanoTSLastRediscovery, NanoTS); ASMAtomicUoWriteBool(&pThis->fRediscoveryPending, false); ASMAtomicWriteBool(&pThis->fDisconnectedFromHost, true); RTSpinlockReleaseNoInts(pThis->hSpinlock); if (pIfNet) ifnet_release(pIfNet); LogRel(("VBoxNetFlt: was detached from '%s' (%d)\n", pThis->szName, cPromisc)); } /** * * @see iff_ioctl_func in the darwin kpi. */ static errno_t vboxNetFltDarwinIffIoCtl(void *pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, u_long uCmd, void *pvArg) { PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvThis; LogFlow(("vboxNetFltDarwinIffIoCtl: pThis=%p uCmd=%lx\n", pThis, uCmd)); /* * Update fOtherPromiscuous. */ /** @todo we'll have to find the offset of if_pcount to get this right! */ //if (uCmd == SIOCSIFFLAGS) //{ // //} /* * We didn't handle it, continue processing. */ NOREF(pThis); NOREF(eProtocol); NOREF(uCmd); NOREF(pvArg); return EOPNOTSUPP; } /** * * @see iff_event_func in the darwin kpi. */ static void vboxNetFltDarwinIffEvent(void *pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, const struct kev_msg *pEvMsg) { PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvThis; LogFlow(("vboxNetFltDarwinIffEvent: pThis=%p\n", pThis)); NOREF(pThis); NOREF(pIfNet); NOREF(eProtocol); NOREF(pEvMsg); /* * Watch out for the interface going online / offline. */ if ( VALID_PTR(pThis) && VALID_PTR(pEvMsg) && pEvMsg->vendor_code == KEV_VENDOR_APPLE && pEvMsg->kev_class == KEV_NETWORK_CLASS && pEvMsg->kev_subclass == KEV_DL_SUBCLASS) { if (pThis->u.s.pIfNet == pIfNet) { if (pEvMsg->event_code == KEV_DL_LINK_ON) { if (ASMAtomicUoReadBool(&pThis->u.s.fNeedSetPromiscuous)) { /* failed to bring it online. */ errno_t err = ifnet_set_promiscuous(pIfNet, 1); if (!err) { ASMAtomicWriteBool(&pThis->u.s.fSetPromiscuous, true); ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false); Log(("vboxNetFltDarwinIffEvent: enabled promiscuous mode on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pIfNet))); } else Log(("vboxNetFltDarwinIffEvent: ifnet_set_promiscuous failed on %s, err=%d (%d)\n", pThis->szName, err, VBOX_GET_PCOUNT(pIfNet))); } else if ( ASMAtomicUoReadBool(&pThis->u.s.fSetPromiscuous) && !(ifnet_flags(pIfNet) & IFF_PROMISC)) { /* Try fix the inconsistency. */ errno_t err = ifnet_set_flags(pIfNet, IFF_PROMISC, IFF_PROMISC); if (!err) err = ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL); if (!err && (ifnet_flags(pIfNet) & IFF_PROMISC)) Log(("vboxNetFltDarwinIffEvent: fixed IFF_PROMISC on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pIfNet))); else Log(("vboxNetFltDarwinIffEvent: failed to fix IFF_PROMISC on %s, err=%d flags=%#x (%d)\n", pThis->szName, err, ifnet_flags(pIfNet), VBOX_GET_PCOUNT(pIfNet))); } else Log(("vboxNetFltDarwinIffEvent: online, '%s'. flags=%#x (%d)\n", pThis->szName, ifnet_flags(pIfNet), VBOX_GET_PCOUNT(pIfNet))); } else if (pEvMsg->event_code == KEV_DL_LINK_OFF) Log(("vboxNetFltDarwinIffEvent: %s goes down (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pIfNet))); /** @todo KEV_DL_LINK_ADDRESS_CHANGED -> pfnReportMacAddress */ /** @todo KEV_DL_SIFFLAGS -> pfnReportPromiscuousMode */ } else Log(("vboxNetFltDarwinIffEvent: pThis->u.s.pIfNet=%p pIfNet=%p (%d)\n", pThis->u.s.pIfNet, pIfNet, VALID_PTR(pIfNet) ? VBOX_GET_PCOUNT(pIfNet) : -1)); } else if (VALID_PTR(pEvMsg)) Log(("vboxNetFltDarwinIffEvent: vendor_code=%#x kev_class=%#x kev_subclass=%#x event_code=%#x\n", pEvMsg->vendor_code, pEvMsg->kev_class, pEvMsg->kev_subclass, pEvMsg->event_code)); } /** * Internal worker for vboxNetFltDarwinIffInput and vboxNetFltDarwinIffOutput, * * @returns 0 or EJUSTRETURN. * @param pThis The instance. * @param pMBuf The mbuf. * @param pvFrame The start of the frame, optional. * @param fSrc Where the packet (allegedly) comes from, one INTNETTRUNKDIR_* value. * @param eProtocol The protocol. */ static errno_t vboxNetFltDarwinIffInputOutputWorker(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame, uint32_t fSrc, protocol_family_t eProtocol) { /* * Drop it immediately? */ Log2(("vboxNetFltDarwinIffInputOutputWorker: pThis=%p pMBuf=%p pvFrame=%p fSrc=%#x cbPkt=%x\n", pThis, pMBuf, pvFrame, fSrc, pMBuf ? mbuf_pkthdr_len(pMBuf) : -1)); if (!pMBuf) return 0; #if 0 /* debugging lost icmp packets */ if (mbuf_pkthdr_len(pMBuf) > 0x300) { uint8_t *pb = (uint8_t *)(pvFrame ? pvFrame : mbuf_data(pMBuf)); Log3(("D=%.6Rhxs S=%.6Rhxs T=%04x IFF\n", pb, pb + 6, RT_BE2H_U16(*(uint16_t *)(pb + 12)))); } #endif if (vboxNetFltDarwinMBufIsOur(pThis, pMBuf, pvFrame)) return 0; /* * Active? Retain the instance and increment the busy counter. */ if (!vboxNetFltTryRetainBusyActive(pThis)) return 0; /* * Finalize out-bound packets since the stack puts off finalizing * TCP/IP checksums as long as possible. * ASSUMES this only applies to outbound IP packets. */ if ( (fSrc & INTNETTRUNKDIR_HOST) && eProtocol == PF_INET) { Assert(!pvFrame); mbuf_outbound_finalize(pMBuf, eProtocol, sizeof(RTNETETHERHDR)); } /* * Create a (scatter/)gather list for the mbuf and feed it to the internal network. */ bool fDropIt = false; unsigned cSegs = vboxNetFltDarwinMBufCalcSGSegs(pThis, pMBuf, pvFrame); if (cSegs < VBOXNETFLT_DARWIN_MAX_SEGS) { PINTNETSG pSG = (PINTNETSG)alloca(RT_OFFSETOF(INTNETSG, aSegs[cSegs])); vboxNetFltDarwinMBufToSG(pThis, pMBuf, pvFrame, pSG, cSegs, fSrc); fDropIt = pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL /* pvIf */, pSG, fSrc); if (fDropIt) { /* * Check if this interface is in promiscuous mode. We should not drop * any packets before they get to the driver as it passes them to tap * callbacks in order for BPF to work properly. */ if (vboxNetFltDarwinIsPromiscuous(pThis)) fDropIt = false; else mbuf_freem(pMBuf); } } vboxNetFltRelease(pThis, true /* fBusy */); return fDropIt ? EJUSTRETURN : 0; } /** * From the host. * * @see iff_output_func in the darwin kpi. */ static errno_t vboxNetFltDarwinIffOutput(void *pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, mbuf_t *ppMBuf) { /** @todo there was some note about the ethernet header here or something like that... */ NOREF(eProtocol); NOREF(pIfNet); return vboxNetFltDarwinIffInputOutputWorker((PVBOXNETFLTINS)pvThis, *ppMBuf, NULL, INTNETTRUNKDIR_HOST, eProtocol); } /** * From the wire. * * @see iff_input_func in the darwin kpi. */ static errno_t vboxNetFltDarwinIffInput(void *pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, mbuf_t *ppMBuf, char **ppchFrame) { NOREF(eProtocol); NOREF(pIfNet); return vboxNetFltDarwinIffInputOutputWorker((PVBOXNETFLTINS)pvThis, *ppMBuf, *ppchFrame, INTNETTRUNKDIR_WIRE, eProtocol); } /** * Internal worker for vboxNetFltOsInitInstance and vboxNetFltOsMaybeRediscovered. * * @returns VBox status code. * @param pThis The instance. * @param fRediscovery If set we're doing a rediscovery attempt, so, don't * flood the release log. */ static int vboxNetFltDarwinAttachToInterface(PVBOXNETFLTINS pThis, bool fRediscovery) { LogFlow(("vboxNetFltDarwinAttachToInterface: pThis=%p (%s)\n", pThis, pThis->szName)); /* * Locate the interface first. * * The pIfNet member is updated before iflt_attach is called and used * to deal with the hypothetical case where someone rips out the * interface immediately after our iflt_attach call. */ ifnet_t pIfNet = NULL; errno_t err = ifnet_find_by_name(pThis->szName, &pIfNet); if (err) { Assert(err == ENXIO); if (!fRediscovery) LogRel(("VBoxFltDrv: failed to find ifnet '%s' (err=%d)\n", pThis->szName, err)); else Log(("VBoxFltDrv: failed to find ifnet '%s' (err=%d)\n", pThis->szName, err)); return VERR_INTNET_FLT_IF_NOT_FOUND; } RTSpinlockAcquire(pThis->hSpinlock); ASMAtomicUoWritePtr(&pThis->u.s.pIfNet, pIfNet); RTSpinlockReleaseNoInts(pThis->hSpinlock); /* * Get the mac address while we still have a valid ifnet reference. */ err = ifnet_lladdr_copy_bytes(pIfNet, &pThis->u.s.MacAddr, sizeof(pThis->u.s.MacAddr)); if (!err) { /* * Try attach the filter. */ struct iff_filter RegRec; RegRec.iff_cookie = pThis; RegRec.iff_name = "VBoxNetFlt"; RegRec.iff_protocol = 0; RegRec.iff_input = vboxNetFltDarwinIffInput; RegRec.iff_output = vboxNetFltDarwinIffOutput; RegRec.iff_event = vboxNetFltDarwinIffEvent; RegRec.iff_ioctl = vboxNetFltDarwinIffIoCtl; RegRec.iff_detached = vboxNetFltDarwinIffDetached; interface_filter_t pIfFilter = NULL; err = iflt_attach(pIfNet, &RegRec, &pIfFilter); Assert(err || pIfFilter); RTSpinlockAcquire(pThis->hSpinlock); pIfNet = ASMAtomicUoReadPtrT(&pThis->u.s.pIfNet, ifnet_t); if (pIfNet && !err) { ASMAtomicUoWriteBool(&pThis->fDisconnectedFromHost, false); ASMAtomicUoWritePtr(&pThis->u.s.pIfFilter, pIfFilter); pIfNet = NULL; /* don't dereference it */ } RTSpinlockReleaseNoInts(pThis->hSpinlock); /* Report capabilities. */ if ( !pIfNet && vboxNetFltTryRetainBusyNotDisconnected(pThis)) { Assert(pThis->pSwitchPort); pThis->pSwitchPort->pfnReportMacAddress(pThis->pSwitchPort, &pThis->u.s.MacAddr); pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort, vboxNetFltDarwinIsPromiscuous(pThis)); pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort, 0, INTNETTRUNKDIR_WIRE | INTNETTRUNKDIR_HOST); pThis->pSwitchPort->pfnReportNoPreemptDsts(pThis->pSwitchPort, 0 /* none */); vboxNetFltRelease(pThis, true /*fBusy*/); } } /* Release the interface on failure. */ if (pIfNet) ifnet_release(pIfNet); int rc = RTErrConvertFromErrno(err); if (RT_SUCCESS(rc)) LogRel(("VBoxFltDrv: attached to '%s' / %.*Rhxs\n", pThis->szName, sizeof(pThis->u.s.MacAddr), &pThis->u.s.MacAddr)); else LogRel(("VBoxFltDrv: failed to attach to ifnet '%s' (err=%d)\n", pThis->szName, err)); return rc; } bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis) { vboxNetFltDarwinAttachToInterface(pThis, true /* fRediscovery */); return !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost); } int vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst) { NOREF(pvIfData); int rc = VINF_SUCCESS; ifnet_t pIfNet = vboxNetFltDarwinRetainIfNet(pThis); if (pIfNet) { /* * Create a mbuf for the gather list and push it onto the wire. * * Note! If the interface is in the promiscuous mode we need to send the * packet down the stack so it reaches the driver and Berkeley * Packet Filter (see @bugref{5817}). */ if ((fDst & INTNETTRUNKDIR_WIRE) || vboxNetFltDarwinIsPromiscuous(pThis)) { mbuf_t pMBuf = vboxNetFltDarwinMBufFromSG(pThis, pSG); if (pMBuf) { errno_t err = ifnet_output_raw(pIfNet, PF_LINK, pMBuf); if (err) rc = RTErrConvertFromErrno(err); } else rc = VERR_NO_MEMORY; } /* * Create a mbuf for the gather list and push it onto the host stack. */ if (fDst & INTNETTRUNKDIR_HOST) { mbuf_t pMBuf = vboxNetFltDarwinMBufFromSG(pThis, pSG); if (pMBuf) { /* This is what IONetworkInterface::inputPacket does. */ unsigned const cbEthHdr = 14; mbuf_pkthdr_setheader(pMBuf, mbuf_data(pMBuf)); mbuf_pkthdr_setlen(pMBuf, mbuf_pkthdr_len(pMBuf) - cbEthHdr); mbuf_setdata(pMBuf, (uint8_t *)mbuf_data(pMBuf) + cbEthHdr, mbuf_len(pMBuf) - cbEthHdr); mbuf_pkthdr_setrcvif(pMBuf, pIfNet); /* will crash without this. */ errno_t err = ifnet_input(pIfNet, pMBuf, NULL); if (err) rc = RTErrConvertFromErrno(err); } else rc = VERR_NO_MEMORY; } vboxNetFltDarwinReleaseIfNet(pThis, pIfNet); } return rc; } void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive) { ifnet_t pIfNet = vboxNetFltDarwinRetainIfNet(pThis); if (pIfNet) { if (pThis->fDisablePromiscuous) { /* * Promiscuous mode should not be used (wireless), we just need to * make sure the interface is up. */ if (fActive) { u_int16_t fIf = ifnet_flags(pIfNet); if ((fIf & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) { ifnet_set_flags(pIfNet, IFF_UP, IFF_UP); ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL); } } } else { /* * This api is a bit weird, the best reference is the code. * * Also, we have a bit or race conditions wrt the maintenance of * host the interface promiscuity for vboxNetFltPortOsIsPromiscuous. */ unsigned const cPromiscBefore = VBOX_GET_PCOUNT(pIfNet); u_int16_t fIf; if (fActive) { Assert(!pThis->u.s.fSetPromiscuous); errno_t err = ENETDOWN; ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, true); /* * Try bring the interface up and running if it's down. */ fIf = ifnet_flags(pIfNet); if ((fIf & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) { err = ifnet_set_flags(pIfNet, IFF_UP, IFF_UP); errno_t err2 = ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL); if (!err) err = err2; fIf = ifnet_flags(pIfNet); } /* * Is it already up? If it isn't, leave it to the link event or * we'll upset if_pcount (as stated above, ifnet_set_promiscuous is weird). */ if ((fIf & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING)) { err = ifnet_set_promiscuous(pIfNet, 1); pThis->u.s.fSetPromiscuous = err == 0; if (!err) { ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false); /* check if it actually worked, this stuff is not always behaving well. */ if (!(ifnet_flags(pIfNet) & IFF_PROMISC)) { err = ifnet_set_flags(pIfNet, IFF_PROMISC, IFF_PROMISC); if (!err) err = ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL); if (!err) Log(("vboxNetFlt: fixed IFF_PROMISC on %s (%d->%d)\n", pThis->szName, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet))); else Log(("VBoxNetFlt: failed to fix IFF_PROMISC on %s, err=%d (%d->%d)\n", pThis->szName, err, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet))); } } else Log(("VBoxNetFlt: ifnet_set_promiscuous -> err=%d grr! (%d->%d)\n", err, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet))); } else if (!err) Log(("VBoxNetFlt: Waiting for the link to come up... (%d->%d)\n", cPromiscBefore, VBOX_GET_PCOUNT(pIfNet))); if (err) LogRel(("VBoxNetFlt: Failed to put '%s' into promiscuous mode, err=%d (%d->%d)\n", pThis->szName, err, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet))); } else { ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false); if (pThis->u.s.fSetPromiscuous) { errno_t err = ifnet_set_promiscuous(pIfNet, 0); AssertMsg(!err, ("%d\n", err)); NOREF(err); } pThis->u.s.fSetPromiscuous = false; fIf = ifnet_flags(pIfNet); Log(("VBoxNetFlt: fIf=%#x; %d->%d\n", fIf, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet))); } } vboxNetFltDarwinReleaseIfNet(pThis, pIfNet); } } int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis) { /* Nothing to do here. */ return VINF_SUCCESS; } int vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis) { /* Nothing to do here. */ return VINF_SUCCESS; } void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis) { interface_filter_t pIfFilter; /* * Carefully obtain the interface filter reference and detach it. */ RTSpinlockAcquire(pThis->hSpinlock); pIfFilter = ASMAtomicUoReadPtrT(&pThis->u.s.pIfFilter, interface_filter_t); if (pIfFilter) ASMAtomicUoWriteNullPtr(&pThis->u.s.pIfFilter); RTSpinlockReleaseNoInts(pThis->hSpinlock); if (pIfFilter) iflt_detach(pIfFilter); } int vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext) { NOREF(pvContext); return vboxNetFltDarwinAttachToInterface(pThis, false /* fRediscovery */); } int vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis) { /* * Init the darwin specific members. */ pThis->u.s.pIfNet = NULL; pThis->u.s.pIfFilter = NULL; pThis->u.s.fSetPromiscuous = false; pThis->u.s.fNeedSetPromiscuous = false; //pThis->u.s.MacAddr = {0}; return VINF_SUCCESS; } void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac) { NOREF(pThis); NOREF(pvIfData); NOREF(pMac); } int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void *pvIf, void **ppvIfData) { /* Nothing to do */ NOREF(pThis); NOREF(pvIf); NOREF(ppvIfData); return VINF_SUCCESS; } int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData) { /* Nothing to do */ NOREF(pThis); NOREF(pvIfData); return VINF_SUCCESS; }