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/* $Id: VBoxGuestR0LibIdc.cpp $ */
/** @file
* VBoxGuestLib - Ring-0 Support Library for VBoxGuest, IDC.
*/
/*
* Copyright (C) 2008-2019 Oracle Corporation
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "VBoxGuestR0LibInternal.h"
#include <iprt/errcore.h>
#include <VBox/VBoxGuest.h>
/*#include <iprt/asm.h>*/
#ifdef VBGL_VBOXGUEST
# error "This file shouldn't be part of the VBoxGuestR0LibBase library that is linked into VBoxGuest. It's client code."
#endif
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/*static PVBGLIDCHANDLE volatile g_pMainHandle = NULL;*/
/**
* Opens the IDC interface of the support driver.
*
* This will perform basic version negotiations and fail if the
* minimum requirements aren't met.
*
* @returns VBox status code.
* @param pHandle The handle structure (output).
* @param uReqVersion The requested version. Pass 0 for default.
* @param uMinVersion The minimum required version. Pass 0 for default.
* @param puSessionVersion Where to store the session version. Optional.
* @param puDriverVersion Where to store the session version. Optional.
* @param puDriverRevision Where to store the SVN revision of the driver. Optional.
*/
DECLR0VBGL(int) VbglR0IdcOpen(PVBGLIDCHANDLE pHandle, uint32_t uReqVersion, uint32_t uMinVersion,
uint32_t *puSessionVersion, uint32_t *puDriverVersion, uint32_t *puDriverRevision)
{
unsigned uDefaultMinVersion;
VBGLIOCIDCCONNECT Req;
int rc;
/*
* Validate and set failure return values.
*/
AssertPtrReturn(pHandle, VERR_INVALID_POINTER);
pHandle->s.pvSession = NULL;
AssertPtrNullReturn(puSessionVersion, VERR_INVALID_POINTER);
if (puSessionVersion)
*puSessionVersion = 0;
AssertPtrNullReturn(puDriverVersion, VERR_INVALID_POINTER);
if (puDriverVersion)
*puDriverVersion = 0;
AssertPtrNullReturn(puDriverRevision, VERR_INVALID_POINTER);
if (puDriverRevision)
*puDriverRevision = 0;
AssertReturn(!uMinVersion || (uMinVersion & UINT32_C(0xffff0000)) == (VBGL_IOC_VERSION & UINT32_C(0xffff0000)), VERR_INVALID_PARAMETER);
AssertReturn(!uReqVersion || (uReqVersion & UINT32_C(0xffff0000)) == (VBGL_IOC_VERSION & UINT32_C(0xffff0000)), VERR_INVALID_PARAMETER);
/*
* Handle default version input and enforce minimum requirements made
* by this library.
*
* The clients will pass defaults (0), and only in the case that some
* special API feature was just added will they set an actual version.
* So, this is the place where can easily enforce a minimum IDC version
* on bugs and similar. It corresponds a bit to what SUPR3Init is
* responsible for.
*/
uDefaultMinVersion = VBGL_IOC_VERSION & UINT32_C(0xffff0000);
if (!uMinVersion || uMinVersion < uDefaultMinVersion)
uMinVersion = uDefaultMinVersion;
if (!uReqVersion || uReqVersion < uDefaultMinVersion)
uReqVersion = uDefaultMinVersion;
/*
* Setup the connect request packet and call the OS specific function.
*/
VBGLREQHDR_INIT(&Req.Hdr, IDC_CONNECT);
Req.u.In.u32MagicCookie = VBGL_IOCTL_IDC_CONNECT_MAGIC_COOKIE;
Req.u.In.uMinVersion = uMinVersion;
Req.u.In.uReqVersion = uReqVersion;
Req.u.In.uReserved = 0;
rc = vbglR0IdcNativeOpen(pHandle, &Req);
if (RT_SUCCESS(rc))
rc = Req.Hdr.rc;
if (RT_SUCCESS(rc))
{
pHandle->s.pvSession = Req.u.Out.pvSession;
if (puSessionVersion)
*puSessionVersion = Req.u.Out.uSessionVersion;
if (puDriverVersion)
*puDriverVersion = Req.u.Out.uDriverVersion;
if (puDriverRevision)
*puDriverRevision = Req.u.Out.uDriverRevision;
/*
* We don't really trust anyone, make sure the returned
* session and version values actually makes sense.
*/
if ( RT_VALID_PTR(Req.u.Out.pvSession)
&& Req.u.Out.uSessionVersion >= uMinVersion
&& (Req.u.Out.uSessionVersion & UINT32_C(0xffff0000)) == (VBGL_IOC_VERSION & UINT32_C(0xffff0000)))
{
/*ASMAtomicCmpXchgPtr(&g_pMainHandle, pHandle, NULL);*/
return rc;
}
AssertMsgFailed(("pSession=%p uSessionVersion=0x%x (r%u)\n", Req.u.Out.pvSession, Req.u.Out.uSessionVersion, Req.u.Out.uDriverRevision));
rc = VERR_VERSION_MISMATCH;
VbglR0IdcClose(pHandle);
}
return rc;
}
/**
* Closes a IDC connection established by VbglR0IdcOpen.
*
* @returns VBox status code.
* @param pHandle The IDC handle.
*/
DECLR0VBGL(int) VbglR0IdcClose(PVBGLIDCHANDLE pHandle)
{
VBGLIOCIDCDISCONNECT Req;
int rc;
/*
* Catch closed handles and check that the session is valid.
*/
AssertPtrReturn(pHandle, VERR_INVALID_POINTER);
if (!pHandle->s.pvSession)
return VERR_INVALID_HANDLE;
AssertPtrReturn(pHandle->s.pvSession, VERR_INVALID_HANDLE);
/*
* Create the request and hand it to the OS specific code.
*/
VBGLREQHDR_INIT(&Req.Hdr, IDC_DISCONNECT);
Req.u.In.pvSession = pHandle->s.pvSession;
rc = vbglR0IdcNativeClose(pHandle, &Req);
if (RT_SUCCESS(rc))
rc = Req.Hdr.rc;
if (RT_SUCCESS(rc))
{
pHandle->s.pvSession = NULL;
/*ASMAtomicCmpXchgPtr(&g_pMainHandle, NULL, pHandle);*/
}
return rc;
}
/**
* Makes an IDC call, returning the request status.
*
* @returns VBox status code. Request status if the I/O control succeeds,
* otherwise the I/O control failure status.
* @param pHandle The IDC handle.
* @param uReq The request number.
* @param pReqHdr The request header.
* @param cbReq The request size.
*/
DECLR0VBGL(int) VbglR0IdcCall(PVBGLIDCHANDLE pHandle, uintptr_t uReq, PVBGLREQHDR pReqHdr, uint32_t cbReq)
{
int rc = VbglR0IdcCallRaw(pHandle, uReq, pReqHdr, cbReq);
if (RT_SUCCESS(rc))
rc = pReqHdr->rc;
return rc;
}
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