summaryrefslogtreecommitdiff
path: root/drivers/virt/vboxguest/vboxguest_linux.c
blob: 73eb34849eabaf64a34a51919cd94f4f7669e750 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
/* 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_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 ||
			 req == VBG_IOCTL_VMMDEV_REQUEST_BIG_ALT;

	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;

	return vbg_core_set_mouse_status(gdev, feat);
}

/**
 * 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");