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/* $Id: VBoxNetIntIf.cpp $ */
/** @file
* VBoxNetIntIf - IntNet Interface Client Routines.
*/
/*
* Copyright (C) 2009-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_DEFAULT
#include "VBoxNetLib.h"
#include <VBox/intnet.h>
#include <VBox/intnetinline.h>
#include <VBox/sup.h>
#include <VBox/vmm/vmm.h>
#include <iprt/errcore.h>
#include <VBox/log.h>
#include <iprt/string.h>
/**
* Flushes the send buffer.
*
* @returns VBox status code.
* @param pSession The support driver session.
* @param hIf The interface handle to flush.
*/
int VBoxNetIntIfFlush(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf)
{
INTNETIFSENDREQ SendReq;
SendReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
SendReq.Hdr.cbReq = sizeof(SendReq);
SendReq.pSession = pSession;
SendReq.hIf = hIf;
return SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_IF_SEND, 0, &SendReq.Hdr);
}
/**
* Copys the SG segments into the specified fram.
*
* @param pvFrame The frame buffer.
* @param cSegs The number of segments.
* @param paSegs The segments.
*/
static void vboxnetIntIfCopySG(void *pvFrame, size_t cSegs, PCINTNETSEG paSegs)
{
uint8_t *pbDst = (uint8_t *)pvFrame;
for (size_t iSeg = 0; iSeg < cSegs; iSeg++)
{
memcpy(pbDst, paSegs[iSeg].pv, paSegs[iSeg].cb);
pbDst += paSegs[iSeg].cb;
}
}
/**
* Writes a frame packet to the buffer.
*
* @returns VBox status code.
* @param pBuf The buffer.
* @param pRingBuf The ring buffer to read from.
* @param cSegs The number of segments.
* @param paSegs The segments.
*/
int VBoxNetIntIfRingWriteFrame(PINTNETBUF pBuf, PINTNETRINGBUF pRingBuf, size_t cSegs, PCINTNETSEG paSegs)
{
RT_NOREF(pBuf);
/*
* Validate input.
*/
AssertPtr(pBuf);
AssertPtr(pRingBuf);
AssertPtr(paSegs);
Assert(cSegs > 0);
/*
* Calc frame size.
*/
uint32_t cbFrame = 0;
for (size_t iSeg = 0; iSeg < cSegs; iSeg++)
cbFrame += paSegs[iSeg].cb;
Assert(cbFrame >= sizeof(RTMAC) * 2);
/*
* Allocate a frame, copy the data and commit it.
*/
PINTNETHDR pHdr = NULL;
void *pvFrame = NULL;
int rc = IntNetRingAllocateFrame(pRingBuf, cbFrame, &pHdr, &pvFrame);
if (RT_SUCCESS(rc))
{
vboxnetIntIfCopySG(pvFrame, cSegs, paSegs);
IntNetRingCommitFrame(pRingBuf, pHdr);
return VINF_SUCCESS;
}
return rc;
}
/**
* Sends a frame
*
* @returns VBox status code.
* @param pSession The support driver session.
* @param hIf The interface handle.
* @param pBuf The interface buffer.
* @param cSegs The number of segments.
* @param paSegs The segments.
* @param fFlush Whether to flush the write.
*/
int VBoxNetIntIfSend(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
size_t cSegs, PCINTNETSEG paSegs, bool fFlush)
{
int rc = VBoxNetIntIfRingWriteFrame(pBuf, &pBuf->Send, cSegs, paSegs);
if (rc == VERR_BUFFER_OVERFLOW)
{
VBoxNetIntIfFlush(pSession, hIf);
rc = VBoxNetIntIfRingWriteFrame(pBuf, &pBuf->Send, cSegs, paSegs);
}
if (RT_SUCCESS(rc) && fFlush)
rc = VBoxNetIntIfFlush(pSession, hIf);
return rc;
}
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