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/* SPDX-License-Identifier: GPL-2.0 */
/*
* vboxguest linux pci driver, char-dev and input-device code,
*
* Copyright (C) 2006-2016 Oracle Corporation
*/
#include <linux/cred.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/vbox_utils.h>
#include "vboxguest_core.h"
/** The device name. */
#define DEVICE_NAME "vboxguest"
/** The device name for the device node open to everyone. */
#define DEVICE_NAME_USER "vboxuser"
/** VirtualBox PCI vendor ID. */
#define VBOX_VENDORID 0x80ee
/** VMMDev PCI card product ID. */
#define VMMDEV_DEVICEID 0xcafe
/** Mutex protecting the global vbg_gdev pointer used by vbg_get/put_gdev. */
static DEFINE_MUTEX(vbg_gdev_mutex);
/** Global vbg_gdev pointer used by vbg_get/put_gdev. */
static struct vbg_dev *vbg_gdev;
static u32 vbg_misc_device_requestor(struct inode *inode)
{
u32 requestor = VMMDEV_REQUESTOR_USERMODE |
VMMDEV_REQUESTOR_CON_DONT_KNOW |
VMMDEV_REQUESTOR_TRUST_NOT_GIVEN;
if (from_kuid(current_user_ns(), current->cred->uid) == 0)
requestor |= VMMDEV_REQUESTOR_USR_ROOT;
else
requestor |= VMMDEV_REQUESTOR_USR_USER;
if (in_egroup_p(inode->i_gid))
requestor |= VMMDEV_REQUESTOR_GRP_VBOX;
return requestor;
}
static int vbg_misc_device_open(struct inode *inode, struct file *filp)
{
struct vbg_session *session;
struct vbg_dev *gdev;
/* misc_open sets filp->private_data to our misc device */
gdev = container_of(filp->private_data, struct vbg_dev, misc_device);
session = vbg_core_open_session(gdev, vbg_misc_device_requestor(inode));
if (IS_ERR(session))
return PTR_ERR(session);
filp->private_data = session;
return 0;
}
static int vbg_misc_device_user_open(struct inode *inode, struct file *filp)
{
struct vbg_session *session;
struct vbg_dev *gdev;
/* misc_open sets filp->private_data to our misc device */
gdev = container_of(filp->private_data, struct vbg_dev,
misc_device_user);
session = vbg_core_open_session(gdev, vbg_misc_device_requestor(inode) |
VMMDEV_REQUESTOR_USER_DEVICE);
if (IS_ERR(session))
return PTR_ERR(session);
filp->private_data = session;
return 0;
}
/**
* Close device.
* Return: 0 on success, negated errno on failure.
* @inode: Pointer to inode info structure.
* @filp: Associated file pointer.
*/
static int vbg_misc_device_close(struct inode *inode, struct file *filp)
{
vbg_core_close_session(filp->private_data);
filp->private_data = NULL;
return 0;
}
/**
* Device I/O Control entry point.
* Return: 0 on success, negated errno on failure.
* @filp: Associated file pointer.
* @req: The request specified to ioctl().
* @arg: The argument specified to ioctl().
*/
static long vbg_misc_device_ioctl(struct file *filp, unsigned int req,
unsigned long arg)
{
struct vbg_session *session = filp->private_data;
size_t returned_size, size;
struct vbg_ioctl_hdr hdr;
bool is_vmmdev_req;
int ret = 0;
void *buf;
if (copy_from_user(&hdr, (void *)arg, sizeof(hdr)))
return -EFAULT;
if (hdr.version != VBG_IOCTL_HDR_VERSION)
return -EINVAL;
if (hdr.size_in < sizeof(hdr) ||
(hdr.size_out && hdr.size_out < sizeof(hdr)))
return -EINVAL;
size = max(hdr.size_in, hdr.size_out);
if (_IOC_SIZE(req) && _IOC_SIZE(req) != size)
return -EINVAL;
if (size > SZ_16M)
return -E2BIG;
/*
* IOCTL_VMMDEV_REQUEST needs the buffer to be below 4G to avoid
* the need for a bounce-buffer and another copy later on.
*/
is_vmmdev_req = (req & ~IOCSIZE_MASK) == VBG_IOCTL_VMMDEV_REQUEST(0) ||
req == VBG_IOCTL_VMMDEV_REQUEST_BIG;
if (is_vmmdev_req)
buf = vbg_req_alloc(size, VBG_IOCTL_HDR_TYPE_DEFAULT,
session->requestor);
else
buf = kmalloc(size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
*((struct vbg_ioctl_hdr *)buf) = hdr;
if (copy_from_user(buf + sizeof(hdr), (void *)arg + sizeof(hdr),
hdr.size_in - sizeof(hdr))) {
ret = -EFAULT;
goto out;
}
if (hdr.size_in < size)
memset(buf + hdr.size_in, 0, size - hdr.size_in);
ret = vbg_core_ioctl(session, req, buf);
if (ret)
goto out;
returned_size = ((struct vbg_ioctl_hdr *)buf)->size_out;
if (returned_size > size) {
vbg_debug("%s: too much output data %zu > %zu\n",
__func__, returned_size, size);
returned_size = size;
}
if (copy_to_user((void *)arg, buf, returned_size) != 0)
ret = -EFAULT;
out:
if (is_vmmdev_req)
vbg_req_free(buf, size);
else
kfree(buf);
return ret;
}
/** The file_operations structures. */
static const struct file_operations vbg_misc_device_fops = {
.owner = THIS_MODULE,
.open = vbg_misc_device_open,
.release = vbg_misc_device_close,
.unlocked_ioctl = vbg_misc_device_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = vbg_misc_device_ioctl,
#endif
};
static const struct file_operations vbg_misc_device_user_fops = {
.owner = THIS_MODULE,
.open = vbg_misc_device_user_open,
.release = vbg_misc_device_close,
.unlocked_ioctl = vbg_misc_device_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = vbg_misc_device_ioctl,
#endif
};
/**
* Called when the input device is first opened.
*
* Sets up absolute mouse reporting.
*/
static int vbg_input_open(struct input_dev *input)
{
struct vbg_dev *gdev = input_get_drvdata(input);
u32 feat = VMMDEV_MOUSE_GUEST_CAN_ABSOLUTE | VMMDEV_MOUSE_NEW_PROTOCOL;
int ret;
ret = vbg_core_set_mouse_status(gdev, feat);
if (ret)
return ret;
return 0;
}
/**
* Called if all open handles to the input device are closed.
*
* Disables absolute reporting.
*/
static void vbg_input_close(struct input_dev *input)
{
struct vbg_dev *gdev = input_get_drvdata(input);
vbg_core_set_mouse_status(gdev, 0);
}
/**
* Creates the kernel input device.
*
* Return: 0 on success, negated errno on failure.
*/
static int vbg_create_input_device(struct vbg_dev *gdev)
{
struct input_dev *input;
input = devm_input_allocate_device(gdev->dev);
if (!input)
return -ENOMEM;
input->id.bustype = BUS_PCI;
input->id.vendor = VBOX_VENDORID;
input->id.product = VMMDEV_DEVICEID;
input->open = vbg_input_open;
input->close = vbg_input_close;
input->dev.parent = gdev->dev;
input->name = "VirtualBox mouse integration";
input_set_abs_params(input, ABS_X, VMMDEV_MOUSE_RANGE_MIN,
VMMDEV_MOUSE_RANGE_MAX, 0, 0);
input_set_abs_params(input, ABS_Y, VMMDEV_MOUSE_RANGE_MIN,
VMMDEV_MOUSE_RANGE_MAX, 0, 0);
input_set_capability(input, EV_KEY, BTN_MOUSE);
input_set_drvdata(input, gdev);
gdev->input = input;
return input_register_device(gdev->input);
}
static ssize_t host_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct vbg_dev *gdev = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", gdev->host_version);
}
static ssize_t host_features_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct vbg_dev *gdev = dev_get_drvdata(dev);
return sprintf(buf, "%#x\n", gdev->host_features);
}
static DEVICE_ATTR_RO(host_version);
static DEVICE_ATTR_RO(host_features);
/**
* Does the PCI detection and init of the device.
*
* Return: 0 on success, negated errno on failure.
*/
static int vbg_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
{
struct device *dev = &pci->dev;
resource_size_t io, io_len, mmio, mmio_len;
struct vmmdev_memory *vmmdev;
struct vbg_dev *gdev;
int ret;
gdev = devm_kzalloc(dev, sizeof(*gdev), GFP_KERNEL);
if (!gdev)
return -ENOMEM;
ret = pci_enable_device(pci);
if (ret != 0) {
vbg_err("vboxguest: Error enabling device: %d\n", ret);
return ret;
}
ret = -ENODEV;
io = pci_resource_start(pci, 0);
io_len = pci_resource_len(pci, 0);
if (!io || !io_len) {
vbg_err("vboxguest: Error IO-port resource (0) is missing\n");
goto err_disable_pcidev;
}
if (devm_request_region(dev, io, io_len, DEVICE_NAME) == NULL) {
vbg_err("vboxguest: Error could not claim IO resource\n");
ret = -EBUSY;
goto err_disable_pcidev;
}
mmio = pci_resource_start(pci, 1);
mmio_len = pci_resource_len(pci, 1);
if (!mmio || !mmio_len) {
vbg_err("vboxguest: Error MMIO resource (1) is missing\n");
goto err_disable_pcidev;
}
if (devm_request_mem_region(dev, mmio, mmio_len, DEVICE_NAME) == NULL) {
vbg_err("vboxguest: Error could not claim MMIO resource\n");
ret = -EBUSY;
goto err_disable_pcidev;
}
vmmdev = devm_ioremap(dev, mmio, mmio_len);
if (!vmmdev) {
vbg_err("vboxguest: Error ioremap failed; MMIO addr=%pap size=%pap\n",
&mmio, &mmio_len);
goto err_disable_pcidev;
}
/* Validate MMIO region version and size. */
if (vmmdev->version != VMMDEV_MEMORY_VERSION ||
vmmdev->size < 32 || vmmdev->size > mmio_len) {
vbg_err("vboxguest: Bogus VMMDev memory; version=%08x (expected %08x) size=%d (expected <= %d)\n",
vmmdev->version, VMMDEV_MEMORY_VERSION,
vmmdev->size, (int)mmio_len);
goto err_disable_pcidev;
}
gdev->io_port = io;
gdev->mmio = vmmdev;
gdev->dev = dev;
gdev->misc_device.minor = MISC_DYNAMIC_MINOR;
gdev->misc_device.name = DEVICE_NAME;
gdev->misc_device.fops = &vbg_misc_device_fops;
gdev->misc_device_user.minor = MISC_DYNAMIC_MINOR;
gdev->misc_device_user.name = DEVICE_NAME_USER;
gdev->misc_device_user.fops = &vbg_misc_device_user_fops;
ret = vbg_core_init(gdev, VMMDEV_EVENT_MOUSE_POSITION_CHANGED);
if (ret)
goto err_disable_pcidev;
ret = vbg_create_input_device(gdev);
if (ret) {
vbg_err("vboxguest: Error creating input device: %d\n", ret);
goto err_vbg_core_exit;
}
ret = devm_request_irq(dev, pci->irq, vbg_core_isr, IRQF_SHARED,
DEVICE_NAME, gdev);
if (ret) {
vbg_err("vboxguest: Error requesting irq: %d\n", ret);
goto err_vbg_core_exit;
}
ret = misc_register(&gdev->misc_device);
if (ret) {
vbg_err("vboxguest: Error misc_register %s failed: %d\n",
DEVICE_NAME, ret);
goto err_vbg_core_exit;
}
ret = misc_register(&gdev->misc_device_user);
if (ret) {
vbg_err("vboxguest: Error misc_register %s failed: %d\n",
DEVICE_NAME_USER, ret);
goto err_unregister_misc_device;
}
mutex_lock(&vbg_gdev_mutex);
if (!vbg_gdev)
vbg_gdev = gdev;
else
ret = -EBUSY;
mutex_unlock(&vbg_gdev_mutex);
if (ret) {
vbg_err("vboxguest: Error more then 1 vbox guest pci device\n");
goto err_unregister_misc_device_user;
}
pci_set_drvdata(pci, gdev);
device_create_file(dev, &dev_attr_host_version);
device_create_file(dev, &dev_attr_host_features);
vbg_info("vboxguest: misc device minor %d, IRQ %d, I/O port %x, MMIO at %pap (size %pap)\n",
gdev->misc_device.minor, pci->irq, gdev->io_port,
&mmio, &mmio_len);
return 0;
err_unregister_misc_device_user:
misc_deregister(&gdev->misc_device_user);
err_unregister_misc_device:
misc_deregister(&gdev->misc_device);
err_vbg_core_exit:
vbg_core_exit(gdev);
err_disable_pcidev:
pci_disable_device(pci);
return ret;
}
static void vbg_pci_remove(struct pci_dev *pci)
{
struct vbg_dev *gdev = pci_get_drvdata(pci);
mutex_lock(&vbg_gdev_mutex);
vbg_gdev = NULL;
mutex_unlock(&vbg_gdev_mutex);
device_remove_file(gdev->dev, &dev_attr_host_features);
device_remove_file(gdev->dev, &dev_attr_host_version);
misc_deregister(&gdev->misc_device_user);
misc_deregister(&gdev->misc_device);
vbg_core_exit(gdev);
pci_disable_device(pci);
}
struct vbg_dev *vbg_get_gdev(void)
{
mutex_lock(&vbg_gdev_mutex);
/*
* Note on success we keep the mutex locked until vbg_put_gdev(),
* this stops vbg_pci_remove from removing the device from underneath
* vboxsf. vboxsf will only hold a reference for a short while.
*/
if (vbg_gdev)
return vbg_gdev;
mutex_unlock(&vbg_gdev_mutex);
return ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL(vbg_get_gdev);
void vbg_put_gdev(struct vbg_dev *gdev)
{
WARN_ON(gdev != vbg_gdev);
mutex_unlock(&vbg_gdev_mutex);
}
EXPORT_SYMBOL(vbg_put_gdev);
/**
* Callback for mouse events.
*
* This is called at the end of the ISR, after leaving the event spinlock, if
* VMMDEV_EVENT_MOUSE_POSITION_CHANGED was raised by the host.
*
* @gdev: The device extension.
*/
void vbg_linux_mouse_event(struct vbg_dev *gdev)
{
int rc;
/* Report events to the kernel input device */
gdev->mouse_status_req->mouse_features = 0;
gdev->mouse_status_req->pointer_pos_x = 0;
gdev->mouse_status_req->pointer_pos_y = 0;
rc = vbg_req_perform(gdev, gdev->mouse_status_req);
if (rc >= 0) {
input_report_abs(gdev->input, ABS_X,
gdev->mouse_status_req->pointer_pos_x);
input_report_abs(gdev->input, ABS_Y,
gdev->mouse_status_req->pointer_pos_y);
input_sync(gdev->input);
}
}
static const struct pci_device_id vbg_pci_ids[] = {
{ .vendor = VBOX_VENDORID, .device = VMMDEV_DEVICEID },
{}
};
MODULE_DEVICE_TABLE(pci, vbg_pci_ids);
static struct pci_driver vbg_pci_driver = {
.name = DEVICE_NAME,
.id_table = vbg_pci_ids,
.probe = vbg_pci_probe,
.remove = vbg_pci_remove,
};
module_pci_driver(vbg_pci_driver);
MODULE_AUTHOR("Oracle Corporation");
MODULE_DESCRIPTION("Oracle VM VirtualBox Guest Additions for Linux Module");
MODULE_LICENSE("GPL");
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