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/*********************************************************
* Copyright (C) 2006-2015 VMware, Inc. All rights reserved.
*
* 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 version 2 and no later version.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*********************************************************/
/*
* bdhandler.c --
*
* Background thread for handling backdoor requests and replies.
*/
/* Must come before any kernel header file. */
#include "driver-config.h"
#include <linux/errno.h>
#include "transport.h"
#include "hgfsBd.h"
#include "hgfsDevLinux.h"
#include "hgfsProto.h"
#include "module.h"
#include "request.h"
#include "rpcout.h"
#include "vm_assert.h"
static Bool HgfsBdChannelOpen(HgfsTransportChannel *channel);
static void HgfsBdChannelClose(HgfsTransportChannel *channel);
static HgfsReq * HgfsBdChannelAllocate(size_t payloadSize);
void HgfsBdChannelFree(HgfsReq *req);
static int HgfsBdChannelSend(HgfsTransportChannel *channel, HgfsReq *req);
static HgfsTransportChannel channel = {
.name = "backdoor",
.ops.open = HgfsBdChannelOpen,
.ops.close = HgfsBdChannelClose,
.ops.allocate = HgfsBdChannelAllocate,
.ops.free = HgfsBdChannelFree,
.ops.send = HgfsBdChannelSend,
.priv = NULL,
.status = HGFS_CHANNEL_NOTCONNECTED
};
/*
*-----------------------------------------------------------------------------
*
* HgfsBdChannelOpen --
*
* Open the backdoor in an idempotent way.
*
* Results:
* TRUE on success, FALSE on failure.
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
static Bool
HgfsBdChannelOpen(HgfsTransportChannel *channel) // IN: Channel
{
Bool ret = FALSE;
ASSERT(channel->status == HGFS_CHANNEL_NOTCONNECTED);
if (HgfsBd_OpenBackdoor((RpcOut **)&channel->priv)) {
LOG(8, ("VMware hgfs: %s: backdoor opened.\n", __func__));
ret = TRUE;
ASSERT(channel->priv != NULL);
}
return ret;
}
/*
*-----------------------------------------------------------------------------
*
* HgfsBdChannelClose --
*
* Close the backdoor in an idempotent way.
*
* Results:
* None
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
static void
HgfsBdChannelClose(HgfsTransportChannel *channel) // IN: Channel
{
ASSERT(channel->priv != NULL);
HgfsBd_CloseBackdoor((RpcOut **)&channel->priv);
ASSERT(channel->priv == NULL);
LOG(8, ("VMware hgfs: %s: backdoor closed.\n", __func__));
}
/*
*-----------------------------------------------------------------------------
*
* HgfsBdChannelAllocate --
*
* Allocate request in a way that is suitable for sending through
* backdoor.
*
* Results:
* NULL on failure; otherwise address of the new request.
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
static HgfsReq *
HgfsBdChannelAllocate(size_t payloadSize) // IN: size of requests payload
{
HgfsReq *req;
req = kmalloc(sizeof(*req) + HGFS_SYNC_REQREP_CLIENT_CMD_LEN + payloadSize,
GFP_KERNEL);
if (likely(req)) {
/* Setup the packet prefix. */
memcpy(req->buffer, HGFS_SYNC_REQREP_CLIENT_CMD,
HGFS_SYNC_REQREP_CLIENT_CMD_LEN);
req->payload = req->buffer + HGFS_SYNC_REQREP_CLIENT_CMD_LEN;
req->bufferSize = payloadSize;
}
return req;
}
/*
*-----------------------------------------------------------------------------
*
* HgfsBdChannelFree --
*
* Free previously allocated request.
*
* Results:
* None.
*
* Side effects:
* None.
*
*-----------------------------------------------------------------------------
*/
void
HgfsBdChannelFree(HgfsReq *req)
{
ASSERT(req);
kfree(req);
}
/*
*----------------------------------------------------------------------
*
* HgfsBdChannelSend --
*
* Send a request via backdoor.
*
* Results:
* 0 on success, negative error on failure.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
static int
HgfsBdChannelSend(HgfsTransportChannel *channel, // IN: Channel
HgfsReq *req) // IN: request to send
{
char const *replyPacket = NULL;
size_t payloadSize;
int ret;
ASSERT(req);
ASSERT(req->state == HGFS_REQ_STATE_UNSENT);
ASSERT(req->payloadSize <= req->bufferSize);
LOG(8, ("VMware hgfs: %s: backdoor sending.\n", __func__));
payloadSize = req->payloadSize;
ret = HgfsBd_Dispatch(channel->priv, HGFS_REQ_PAYLOAD(req), &payloadSize,
&replyPacket);
if (ret == 0) {
LOG(8, ("VMware hgfs: %s: Backdoor reply received.\n", __func__));
/* Request sent successfully. Copy the reply and wake the client. */
ASSERT(replyPacket);
ASSERT(payloadSize <= req->bufferSize);
memcpy(HGFS_REQ_PAYLOAD(req), replyPacket, payloadSize);
req->payloadSize = payloadSize;
HgfsCompleteReq(req);
}
return ret;
}
/*
*----------------------------------------------------------------------
*
* HgfsGetBdChannel --
*
* Initialize backdoor channel.
*
* Results:
* Always return pointer to back door channel.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
HgfsTransportChannel*
HgfsGetBdChannel(void)
{
return &channel;
}
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