| 1 | /* $Id: VBoxNetIntIf.cpp 69496 2017-10-28 14:55:58Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxNetIntIf - IntNet Interface Client Routines.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2009-2017 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_DEFAULT
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| 23 | #include "VBoxNetLib.h"
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| 24 | #include <VBox/intnet.h>
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| 25 | #include <VBox/intnetinline.h>
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| 26 | #include <VBox/sup.h>
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| 27 | #include <VBox/vmm/vmm.h>
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| 28 | #include <VBox/err.h>
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| 29 | #include <VBox/log.h>
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| 30 |
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| 31 | #include <iprt/string.h>
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| 32 |
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| 33 |
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| 34 |
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| 35 | /**
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| 36 | * Flushes the send buffer.
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| 37 | *
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| 38 | * @returns VBox status code.
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| 39 | * @param pSession The support driver session.
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| 40 | * @param hIf The interface handle to flush.
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| 41 | */
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| 42 | int VBoxNetIntIfFlush(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf)
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| 43 | {
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| 44 | INTNETIFSENDREQ SendReq;
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| 45 | SendReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
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| 46 | SendReq.Hdr.cbReq = sizeof(SendReq);
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| 47 | SendReq.pSession = pSession;
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| 48 | SendReq.hIf = hIf;
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| 49 | return SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_IF_SEND, 0, &SendReq.Hdr);
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| 50 | }
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| 51 |
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| 52 |
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| 53 | /**
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| 54 | * Copys the SG segments into the specified fram.
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| 55 | *
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| 56 | * @param pvFrame The frame buffer.
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| 57 | * @param cSegs The number of segments.
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| 58 | * @param paSegs The segments.
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| 59 | */
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| 60 | static void vboxnetIntIfCopySG(void *pvFrame, size_t cSegs, PCINTNETSEG paSegs)
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| 61 | {
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| 62 | uint8_t *pbDst = (uint8_t *)pvFrame;
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| 63 | for (size_t iSeg = 0; iSeg < cSegs; iSeg++)
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| 64 | {
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| 65 | memcpy(pbDst, paSegs[iSeg].pv, paSegs[iSeg].cb);
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| 66 | pbDst += paSegs[iSeg].cb;
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| 67 | }
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| 68 | }
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| 69 |
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| 70 |
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| 71 | /**
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| 72 | * Writes a frame packet to the buffer.
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| 73 | *
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| 74 | * @returns VBox status code.
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| 75 | * @param pBuf The buffer.
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| 76 | * @param pRingBuf The ring buffer to read from.
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| 77 | * @param cSegs The number of segments.
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| 78 | * @param paSegs The segments.
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| 79 | */
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| 80 | int VBoxNetIntIfRingWriteFrame(PINTNETBUF pBuf, PINTNETRINGBUF pRingBuf, size_t cSegs, PCINTNETSEG paSegs)
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| 81 | {
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| 82 | RT_NOREF(pBuf);
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| 83 |
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| 84 | /*
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| 85 | * Validate input.
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| 86 | */
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| 87 | AssertPtr(pBuf);
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| 88 | AssertPtr(pRingBuf);
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| 89 | AssertPtr(paSegs);
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| 90 | Assert(cSegs > 0);
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| 91 |
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| 92 | /*
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| 93 | * Calc frame size.
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| 94 | */
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| 95 | uint32_t cbFrame = 0;
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| 96 | for (size_t iSeg = 0; iSeg < cSegs; iSeg++)
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| 97 | cbFrame += paSegs[iSeg].cb;
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| 98 | Assert(cbFrame >= sizeof(RTMAC) * 2);
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| 99 |
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| 100 | /*
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| 101 | * Allocate a frame, copy the data and commit it.
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| 102 | */
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| 103 | PINTNETHDR pHdr = NULL;
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| 104 | void *pvFrame = NULL;
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| 105 | int rc = IntNetRingAllocateFrame(pRingBuf, cbFrame, &pHdr, &pvFrame);
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| 106 | if (RT_SUCCESS(rc))
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| 107 | {
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| 108 | vboxnetIntIfCopySG(pvFrame, cSegs, paSegs);
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| 109 | IntNetRingCommitFrame(pRingBuf, pHdr);
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| 110 | return VINF_SUCCESS;
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| 111 | }
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| 112 |
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| 113 | return rc;
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| 114 | }
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| 115 |
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| 116 |
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| 117 | /**
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| 118 | * Sends a frame
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| 119 | *
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| 120 | * @returns VBox status code.
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| 121 | * @param pSession The support driver session.
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| 122 | * @param hIf The interface handle.
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| 123 | * @param pBuf The interface buffer.
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| 124 | * @param cSegs The number of segments.
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| 125 | * @param paSegs The segments.
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| 126 | * @param fFlush Whether to flush the write.
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| 127 | */
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| 128 | int VBoxNetIntIfSend(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
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| 129 | size_t cSegs, PCINTNETSEG paSegs, bool fFlush)
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| 130 | {
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| 131 | int rc = VBoxNetIntIfRingWriteFrame(pBuf, &pBuf->Send, cSegs, paSegs);
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| 132 | if (rc == VERR_BUFFER_OVERFLOW)
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| 133 | {
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| 134 | VBoxNetIntIfFlush(pSession, hIf);
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| 135 | rc = VBoxNetIntIfRingWriteFrame(pBuf, &pBuf->Send, cSegs, paSegs);
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| 136 | }
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| 137 | if (RT_SUCCESS(rc) && fFlush)
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| 138 | rc = VBoxNetIntIfFlush(pSession, hIf);
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| 139 | return rc;
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| 140 | }
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