1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * vboxguest linux pci driver, char-dev and input-device code, 4 * 5 * Copyright (C) 2006-2016 Oracle Corporation 6 */ 7 8 #include <linux/cred.h> 9 #include <linux/input.h> 10 #include <linux/kernel.h> 11 #include <linux/miscdevice.h> 12 #include <linux/module.h> 13 #include <linux/pci.h> 14 #include <linux/poll.h> 15 #include <linux/vbox_utils.h> 16 #include "vboxguest_core.h" 17 18 /** The device name. */ 19 #define DEVICE_NAME "vboxguest" 20 /** The device name for the device node open to everyone. */ 21 #define DEVICE_NAME_USER "vboxuser" 22 /** VirtualBox PCI vendor ID. */ 23 #define VBOX_VENDORID 0x80ee 24 /** VMMDev PCI card product ID. */ 25 #define VMMDEV_DEVICEID 0xcafe 26 27 /** Mutex protecting the global vbg_gdev pointer used by vbg_get/put_gdev. */ 28 static DEFINE_MUTEX(vbg_gdev_mutex); 29 /** Global vbg_gdev pointer used by vbg_get/put_gdev. */ 30 static struct vbg_dev *vbg_gdev; 31 32 static u32 vbg_misc_device_requestor(struct inode *inode) 33 { 34 u32 requestor = VMMDEV_REQUESTOR_USERMODE | 35 VMMDEV_REQUESTOR_CON_DONT_KNOW | 36 VMMDEV_REQUESTOR_TRUST_NOT_GIVEN; 37 38 if (from_kuid(current_user_ns(), current_uid()) == 0) 39 requestor |= VMMDEV_REQUESTOR_USR_ROOT; 40 else 41 requestor |= VMMDEV_REQUESTOR_USR_USER; 42 43 if (in_egroup_p(inode->i_gid)) 44 requestor |= VMMDEV_REQUESTOR_GRP_VBOX; 45 46 return requestor; 47 } 48 49 static int vbg_misc_device_open(struct inode *inode, struct file *filp) 50 { 51 struct vbg_session *session; 52 struct vbg_dev *gdev; 53 54 /* misc_open sets filp->private_data to our misc device */ 55 gdev = container_of(filp->private_data, struct vbg_dev, misc_device); 56 57 session = vbg_core_open_session(gdev, vbg_misc_device_requestor(inode)); 58 if (IS_ERR(session)) 59 return PTR_ERR(session); 60 61 filp->private_data = session; 62 return 0; 63 } 64 65 static int vbg_misc_device_user_open(struct inode *inode, struct file *filp) 66 { 67 struct vbg_session *session; 68 struct vbg_dev *gdev; 69 70 /* misc_open sets filp->private_data to our misc device */ 71 gdev = container_of(filp->private_data, struct vbg_dev, 72 misc_device_user); 73 74 session = vbg_core_open_session(gdev, vbg_misc_device_requestor(inode) | 75 VMMDEV_REQUESTOR_USER_DEVICE); 76 if (IS_ERR(session)) 77 return PTR_ERR(session); 78 79 filp->private_data = session; 80 return 0; 81 } 82 83 /** 84 * Close device. 85 * Return: 0 on success, negated errno on failure. 86 * @inode: Pointer to inode info structure. 87 * @filp: Associated file pointer. 88 */ 89 static int vbg_misc_device_close(struct inode *inode, struct file *filp) 90 { 91 vbg_core_close_session(filp->private_data); 92 filp->private_data = NULL; 93 return 0; 94 } 95 96 /** 97 * Device I/O Control entry point. 98 * Return: 0 on success, negated errno on failure. 99 * @filp: Associated file pointer. 100 * @req: The request specified to ioctl(). 101 * @arg: The argument specified to ioctl(). 102 */ 103 static long vbg_misc_device_ioctl(struct file *filp, unsigned int req, 104 unsigned long arg) 105 { 106 struct vbg_session *session = filp->private_data; 107 size_t returned_size, size; 108 struct vbg_ioctl_hdr hdr; 109 bool is_vmmdev_req; 110 int ret = 0; 111 void *buf; 112 113 if (copy_from_user(&hdr, (void *)arg, sizeof(hdr))) 114 return -EFAULT; 115 116 if (hdr.version != VBG_IOCTL_HDR_VERSION) 117 return -EINVAL; 118 119 if (hdr.size_in < sizeof(hdr) || 120 (hdr.size_out && hdr.size_out < sizeof(hdr))) 121 return -EINVAL; 122 123 size = max(hdr.size_in, hdr.size_out); 124 if (_IOC_SIZE(req) && _IOC_SIZE(req) != size) 125 return -EINVAL; 126 if (size > SZ_16M) 127 return -E2BIG; 128 129 /* 130 * IOCTL_VMMDEV_REQUEST needs the buffer to be below 4G to avoid 131 * the need for a bounce-buffer and another copy later on. 132 */ 133 is_vmmdev_req = (req & ~IOCSIZE_MASK) == VBG_IOCTL_VMMDEV_REQUEST(0) || 134 req == VBG_IOCTL_VMMDEV_REQUEST_BIG || 135 req == VBG_IOCTL_VMMDEV_REQUEST_BIG_ALT; 136 137 if (is_vmmdev_req) 138 buf = vbg_req_alloc(size, VBG_IOCTL_HDR_TYPE_DEFAULT, 139 session->requestor); 140 else 141 buf = kmalloc(size, GFP_KERNEL); 142 if (!buf) 143 return -ENOMEM; 144 145 *((struct vbg_ioctl_hdr *)buf) = hdr; 146 if (copy_from_user(buf + sizeof(hdr), (void *)arg + sizeof(hdr), 147 hdr.size_in - sizeof(hdr))) { 148 ret = -EFAULT; 149 goto out; 150 } 151 if (hdr.size_in < size) 152 memset(buf + hdr.size_in, 0, size - hdr.size_in); 153 154 ret = vbg_core_ioctl(session, req, buf); 155 if (ret) 156 goto out; 157 158 returned_size = ((struct vbg_ioctl_hdr *)buf)->size_out; 159 if (returned_size > size) { 160 vbg_debug("%s: too much output data %zu > %zu\n", 161 __func__, returned_size, size); 162 returned_size = size; 163 } 164 if (copy_to_user((void *)arg, buf, returned_size) != 0) 165 ret = -EFAULT; 166 167 out: 168 if (is_vmmdev_req) 169 vbg_req_free(buf, size); 170 else 171 kfree(buf); 172 173 return ret; 174 } 175 176 /** The file_operations structures. */ 177 static const struct file_operations vbg_misc_device_fops = { 178 .owner = THIS_MODULE, 179 .open = vbg_misc_device_open, 180 .release = vbg_misc_device_close, 181 .unlocked_ioctl = vbg_misc_device_ioctl, 182 #ifdef CONFIG_COMPAT 183 .compat_ioctl = vbg_misc_device_ioctl, 184 #endif 185 }; 186 static const struct file_operations vbg_misc_device_user_fops = { 187 .owner = THIS_MODULE, 188 .open = vbg_misc_device_user_open, 189 .release = vbg_misc_device_close, 190 .unlocked_ioctl = vbg_misc_device_ioctl, 191 #ifdef CONFIG_COMPAT 192 .compat_ioctl = vbg_misc_device_ioctl, 193 #endif 194 }; 195 196 /** 197 * Called when the input device is first opened. 198 * 199 * Sets up absolute mouse reporting. 200 */ 201 static int vbg_input_open(struct input_dev *input) 202 { 203 struct vbg_dev *gdev = input_get_drvdata(input); 204 u32 feat = VMMDEV_MOUSE_GUEST_CAN_ABSOLUTE | VMMDEV_MOUSE_NEW_PROTOCOL; 205 206 return vbg_core_set_mouse_status(gdev, feat); 207 } 208 209 /** 210 * Called if all open handles to the input device are closed. 211 * 212 * Disables absolute reporting. 213 */ 214 static void vbg_input_close(struct input_dev *input) 215 { 216 struct vbg_dev *gdev = input_get_drvdata(input); 217 218 vbg_core_set_mouse_status(gdev, 0); 219 } 220 221 /** 222 * Creates the kernel input device. 223 * 224 * Return: 0 on success, negated errno on failure. 225 */ 226 static int vbg_create_input_device(struct vbg_dev *gdev) 227 { 228 struct input_dev *input; 229 230 input = devm_input_allocate_device(gdev->dev); 231 if (!input) 232 return -ENOMEM; 233 234 input->id.bustype = BUS_PCI; 235 input->id.vendor = VBOX_VENDORID; 236 input->id.product = VMMDEV_DEVICEID; 237 input->open = vbg_input_open; 238 input->close = vbg_input_close; 239 input->dev.parent = gdev->dev; 240 input->name = "VirtualBox mouse integration"; 241 242 input_set_abs_params(input, ABS_X, VMMDEV_MOUSE_RANGE_MIN, 243 VMMDEV_MOUSE_RANGE_MAX, 0, 0); 244 input_set_abs_params(input, ABS_Y, VMMDEV_MOUSE_RANGE_MIN, 245 VMMDEV_MOUSE_RANGE_MAX, 0, 0); 246 input_set_capability(input, EV_KEY, BTN_MOUSE); 247 input_set_drvdata(input, gdev); 248 249 gdev->input = input; 250 251 return input_register_device(gdev->input); 252 } 253 254 static ssize_t host_version_show(struct device *dev, 255 struct device_attribute *attr, char *buf) 256 { 257 struct vbg_dev *gdev = dev_get_drvdata(dev); 258 259 return sprintf(buf, "%s\n", gdev->host_version); 260 } 261 262 static ssize_t host_features_show(struct device *dev, 263 struct device_attribute *attr, char *buf) 264 { 265 struct vbg_dev *gdev = dev_get_drvdata(dev); 266 267 return sprintf(buf, "%#x\n", gdev->host_features); 268 } 269 270 static DEVICE_ATTR_RO(host_version); 271 static DEVICE_ATTR_RO(host_features); 272 273 static struct attribute *vbg_pci_attrs[] = { 274 &dev_attr_host_version.attr, 275 &dev_attr_host_features.attr, 276 NULL, 277 }; 278 ATTRIBUTE_GROUPS(vbg_pci); 279 280 /** 281 * Does the PCI detection and init of the device. 282 * 283 * Return: 0 on success, negated errno on failure. 284 */ 285 static int vbg_pci_probe(struct pci_dev *pci, const struct pci_device_id *id) 286 { 287 struct device *dev = &pci->dev; 288 resource_size_t io, io_len, mmio, mmio_len; 289 struct vmmdev_memory *vmmdev; 290 struct vbg_dev *gdev; 291 int ret; 292 293 gdev = devm_kzalloc(dev, sizeof(*gdev), GFP_KERNEL); 294 if (!gdev) 295 return -ENOMEM; 296 297 ret = pci_enable_device(pci); 298 if (ret != 0) { 299 vbg_err("vboxguest: Error enabling device: %d\n", ret); 300 return ret; 301 } 302 303 ret = -ENODEV; 304 305 io = pci_resource_start(pci, 0); 306 io_len = pci_resource_len(pci, 0); 307 if (!io || !io_len) { 308 vbg_err("vboxguest: Error IO-port resource (0) is missing\n"); 309 goto err_disable_pcidev; 310 } 311 if (devm_request_region(dev, io, io_len, DEVICE_NAME) == NULL) { 312 vbg_err("vboxguest: Error could not claim IO resource\n"); 313 ret = -EBUSY; 314 goto err_disable_pcidev; 315 } 316 317 mmio = pci_resource_start(pci, 1); 318 mmio_len = pci_resource_len(pci, 1); 319 if (!mmio || !mmio_len) { 320 vbg_err("vboxguest: Error MMIO resource (1) is missing\n"); 321 goto err_disable_pcidev; 322 } 323 324 if (devm_request_mem_region(dev, mmio, mmio_len, DEVICE_NAME) == NULL) { 325 vbg_err("vboxguest: Error could not claim MMIO resource\n"); 326 ret = -EBUSY; 327 goto err_disable_pcidev; 328 } 329 330 vmmdev = devm_ioremap(dev, mmio, mmio_len); 331 if (!vmmdev) { 332 vbg_err("vboxguest: Error ioremap failed; MMIO addr=%pap size=%pap\n", 333 &mmio, &mmio_len); 334 goto err_disable_pcidev; 335 } 336 337 /* Validate MMIO region version and size. */ 338 if (vmmdev->version != VMMDEV_MEMORY_VERSION || 339 vmmdev->size < 32 || vmmdev->size > mmio_len) { 340 vbg_err("vboxguest: Bogus VMMDev memory; version=%08x (expected %08x) size=%d (expected <= %d)\n", 341 vmmdev->version, VMMDEV_MEMORY_VERSION, 342 vmmdev->size, (int)mmio_len); 343 goto err_disable_pcidev; 344 } 345 346 gdev->io_port = io; 347 gdev->mmio = vmmdev; 348 gdev->dev = dev; 349 gdev->misc_device.minor = MISC_DYNAMIC_MINOR; 350 gdev->misc_device.name = DEVICE_NAME; 351 gdev->misc_device.fops = &vbg_misc_device_fops; 352 gdev->misc_device_user.minor = MISC_DYNAMIC_MINOR; 353 gdev->misc_device_user.name = DEVICE_NAME_USER; 354 gdev->misc_device_user.fops = &vbg_misc_device_user_fops; 355 356 ret = vbg_core_init(gdev, VMMDEV_EVENT_MOUSE_POSITION_CHANGED); 357 if (ret) 358 goto err_disable_pcidev; 359 360 ret = vbg_create_input_device(gdev); 361 if (ret) { 362 vbg_err("vboxguest: Error creating input device: %d\n", ret); 363 goto err_vbg_core_exit; 364 } 365 366 ret = request_irq(pci->irq, vbg_core_isr, IRQF_SHARED, DEVICE_NAME, 367 gdev); 368 if (ret) { 369 vbg_err("vboxguest: Error requesting irq: %d\n", ret); 370 goto err_vbg_core_exit; 371 } 372 373 ret = misc_register(&gdev->misc_device); 374 if (ret) { 375 vbg_err("vboxguest: Error misc_register %s failed: %d\n", 376 DEVICE_NAME, ret); 377 goto err_free_irq; 378 } 379 380 ret = misc_register(&gdev->misc_device_user); 381 if (ret) { 382 vbg_err("vboxguest: Error misc_register %s failed: %d\n", 383 DEVICE_NAME_USER, ret); 384 goto err_unregister_misc_device; 385 } 386 387 mutex_lock(&vbg_gdev_mutex); 388 if (!vbg_gdev) 389 vbg_gdev = gdev; 390 else 391 ret = -EBUSY; 392 mutex_unlock(&vbg_gdev_mutex); 393 394 if (ret) { 395 vbg_err("vboxguest: Error more then 1 vbox guest pci device\n"); 396 goto err_unregister_misc_device_user; 397 } 398 399 pci_set_drvdata(pci, gdev); 400 401 return 0; 402 403 err_unregister_misc_device_user: 404 misc_deregister(&gdev->misc_device_user); 405 err_unregister_misc_device: 406 misc_deregister(&gdev->misc_device); 407 err_free_irq: 408 free_irq(pci->irq, gdev); 409 err_vbg_core_exit: 410 vbg_core_exit(gdev); 411 err_disable_pcidev: 412 pci_disable_device(pci); 413 414 return ret; 415 } 416 417 static void vbg_pci_remove(struct pci_dev *pci) 418 { 419 struct vbg_dev *gdev = pci_get_drvdata(pci); 420 421 mutex_lock(&vbg_gdev_mutex); 422 vbg_gdev = NULL; 423 mutex_unlock(&vbg_gdev_mutex); 424 425 free_irq(pci->irq, gdev); 426 misc_deregister(&gdev->misc_device_user); 427 misc_deregister(&gdev->misc_device); 428 vbg_core_exit(gdev); 429 pci_disable_device(pci); 430 } 431 432 struct vbg_dev *vbg_get_gdev(void) 433 { 434 mutex_lock(&vbg_gdev_mutex); 435 436 /* 437 * Note on success we keep the mutex locked until vbg_put_gdev(), 438 * this stops vbg_pci_remove from removing the device from underneath 439 * vboxsf. vboxsf will only hold a reference for a short while. 440 */ 441 if (vbg_gdev) 442 return vbg_gdev; 443 444 mutex_unlock(&vbg_gdev_mutex); 445 return ERR_PTR(-ENODEV); 446 } 447 EXPORT_SYMBOL(vbg_get_gdev); 448 449 void vbg_put_gdev(struct vbg_dev *gdev) 450 { 451 WARN_ON(gdev != vbg_gdev); 452 mutex_unlock(&vbg_gdev_mutex); 453 } 454 EXPORT_SYMBOL(vbg_put_gdev); 455 456 /** 457 * Callback for mouse events. 458 * 459 * This is called at the end of the ISR, after leaving the event spinlock, if 460 * VMMDEV_EVENT_MOUSE_POSITION_CHANGED was raised by the host. 461 * 462 * @gdev: The device extension. 463 */ 464 void vbg_linux_mouse_event(struct vbg_dev *gdev) 465 { 466 int rc; 467 468 /* Report events to the kernel input device */ 469 gdev->mouse_status_req->mouse_features = 0; 470 gdev->mouse_status_req->pointer_pos_x = 0; 471 gdev->mouse_status_req->pointer_pos_y = 0; 472 rc = vbg_req_perform(gdev, gdev->mouse_status_req); 473 if (rc >= 0) { 474 input_report_abs(gdev->input, ABS_X, 475 gdev->mouse_status_req->pointer_pos_x); 476 input_report_abs(gdev->input, ABS_Y, 477 gdev->mouse_status_req->pointer_pos_y); 478 input_sync(gdev->input); 479 } 480 } 481 482 static const struct pci_device_id vbg_pci_ids[] = { 483 { .vendor = VBOX_VENDORID, .device = VMMDEV_DEVICEID }, 484 {} 485 }; 486 MODULE_DEVICE_TABLE(pci, vbg_pci_ids); 487 488 static struct pci_driver vbg_pci_driver = { 489 .name = DEVICE_NAME, 490 .dev_groups = vbg_pci_groups, 491 .id_table = vbg_pci_ids, 492 .probe = vbg_pci_probe, 493 .remove = vbg_pci_remove, 494 }; 495 496 module_pci_driver(vbg_pci_driver); 497 498 MODULE_AUTHOR("Oracle Corporation"); 499 MODULE_DESCRIPTION("Oracle VM VirtualBox Guest Additions for Linux Module"); 500 MODULE_LICENSE("GPL"); 501