]> Git Repo - linux.git/blob - drivers/bluetooth/hci_vhci.c
crypto: akcipher - Drop sign/verify operations
[linux.git] / drivers / bluetooth / hci_vhci.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *
4  *  Bluetooth virtual HCI driver
5  *
6  *  Copyright (C) 2000-2001  Qualcomm Incorporated
7  *  Copyright (C) 2002-2003  Maxim Krasnyansky <[email protected]>
8  *  Copyright (C) 2004-2006  Marcel Holtmann <[email protected]>
9  */
10
11 #include <linux/module.h>
12 #include <asm/unaligned.h>
13
14 #include <linux/atomic.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/types.h>
19 #include <linux/errno.h>
20 #include <linux/sched.h>
21 #include <linux/poll.h>
22
23 #include <linux/skbuff.h>
24 #include <linux/miscdevice.h>
25 #include <linux/debugfs.h>
26
27 #include <net/bluetooth/bluetooth.h>
28 #include <net/bluetooth/hci_core.h>
29
30 #define VERSION "1.5"
31
32 static bool amp;
33
34 struct vhci_data {
35         struct hci_dev *hdev;
36
37         wait_queue_head_t read_wait;
38         struct sk_buff_head readq;
39
40         struct mutex open_mutex;
41         struct delayed_work open_timeout;
42         struct work_struct suspend_work;
43
44         bool suspended;
45         bool wakeup;
46         __u16 msft_opcode;
47         bool aosp_capable;
48         atomic_t initialized;
49 };
50
51 static int vhci_open_dev(struct hci_dev *hdev)
52 {
53         return 0;
54 }
55
56 static int vhci_close_dev(struct hci_dev *hdev)
57 {
58         struct vhci_data *data = hci_get_drvdata(hdev);
59
60         skb_queue_purge(&data->readq);
61
62         return 0;
63 }
64
65 static int vhci_flush(struct hci_dev *hdev)
66 {
67         struct vhci_data *data = hci_get_drvdata(hdev);
68
69         skb_queue_purge(&data->readq);
70
71         return 0;
72 }
73
74 static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
75 {
76         struct vhci_data *data = hci_get_drvdata(hdev);
77
78         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
79
80         skb_queue_tail(&data->readq, skb);
81
82         if (atomic_read(&data->initialized))
83                 wake_up_interruptible(&data->read_wait);
84         return 0;
85 }
86
87 static int vhci_get_data_path_id(struct hci_dev *hdev, u8 *data_path_id)
88 {
89         *data_path_id = 0;
90         return 0;
91 }
92
93 static int vhci_get_codec_config_data(struct hci_dev *hdev, __u8 type,
94                                       struct bt_codec *codec, __u8 *vnd_len,
95                                       __u8 **vnd_data)
96 {
97         if (type != ESCO_LINK)
98                 return -EINVAL;
99
100         *vnd_len = 0;
101         *vnd_data = NULL;
102         return 0;
103 }
104
105 static bool vhci_wakeup(struct hci_dev *hdev)
106 {
107         struct vhci_data *data = hci_get_drvdata(hdev);
108
109         return data->wakeup;
110 }
111
112 static ssize_t force_suspend_read(struct file *file, char __user *user_buf,
113                                   size_t count, loff_t *ppos)
114 {
115         struct vhci_data *data = file->private_data;
116         char buf[3];
117
118         buf[0] = data->suspended ? 'Y' : 'N';
119         buf[1] = '\n';
120         buf[2] = '\0';
121         return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
122 }
123
124 static void vhci_suspend_work(struct work_struct *work)
125 {
126         struct vhci_data *data = container_of(work, struct vhci_data,
127                                               suspend_work);
128
129         if (data->suspended)
130                 hci_suspend_dev(data->hdev);
131         else
132                 hci_resume_dev(data->hdev);
133 }
134
135 static ssize_t force_suspend_write(struct file *file,
136                                    const char __user *user_buf,
137                                    size_t count, loff_t *ppos)
138 {
139         struct vhci_data *data = file->private_data;
140         bool enable;
141         int err;
142
143         err = kstrtobool_from_user(user_buf, count, &enable);
144         if (err)
145                 return err;
146
147         if (data->suspended == enable)
148                 return -EALREADY;
149
150         data->suspended = enable;
151
152         schedule_work(&data->suspend_work);
153
154         return count;
155 }
156
157 static const struct file_operations force_suspend_fops = {
158         .open           = simple_open,
159         .read           = force_suspend_read,
160         .write          = force_suspend_write,
161         .llseek         = default_llseek,
162 };
163
164 static ssize_t force_wakeup_read(struct file *file, char __user *user_buf,
165                                  size_t count, loff_t *ppos)
166 {
167         struct vhci_data *data = file->private_data;
168         char buf[3];
169
170         buf[0] = data->wakeup ? 'Y' : 'N';
171         buf[1] = '\n';
172         buf[2] = '\0';
173         return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
174 }
175
176 static ssize_t force_wakeup_write(struct file *file,
177                                   const char __user *user_buf, size_t count,
178                                   loff_t *ppos)
179 {
180         struct vhci_data *data = file->private_data;
181         bool enable;
182         int err;
183
184         err = kstrtobool_from_user(user_buf, count, &enable);
185         if (err)
186                 return err;
187
188         if (data->wakeup == enable)
189                 return -EALREADY;
190
191         data->wakeup = enable;
192
193         return count;
194 }
195
196 static const struct file_operations force_wakeup_fops = {
197         .open           = simple_open,
198         .read           = force_wakeup_read,
199         .write          = force_wakeup_write,
200         .llseek         = default_llseek,
201 };
202
203 static int msft_opcode_set(void *data, u64 val)
204 {
205         struct vhci_data *vhci = data;
206
207         if (val > 0xffff || hci_opcode_ogf(val) != 0x3f)
208                 return -EINVAL;
209
210         if (vhci->msft_opcode)
211                 return -EALREADY;
212
213         vhci->msft_opcode = val;
214
215         return 0;
216 }
217
218 static int msft_opcode_get(void *data, u64 *val)
219 {
220         struct vhci_data *vhci = data;
221
222         *val = vhci->msft_opcode;
223
224         return 0;
225 }
226
227 DEFINE_DEBUGFS_ATTRIBUTE(msft_opcode_fops, msft_opcode_get, msft_opcode_set,
228                          "%llu\n");
229
230 static ssize_t aosp_capable_read(struct file *file, char __user *user_buf,
231                                  size_t count, loff_t *ppos)
232 {
233         struct vhci_data *vhci = file->private_data;
234         char buf[3];
235
236         buf[0] = vhci->aosp_capable ? 'Y' : 'N';
237         buf[1] = '\n';
238         buf[2] = '\0';
239         return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
240 }
241
242 static ssize_t aosp_capable_write(struct file *file,
243                                   const char __user *user_buf, size_t count,
244                                   loff_t *ppos)
245 {
246         struct vhci_data *vhci = file->private_data;
247         bool enable;
248         int err;
249
250         err = kstrtobool_from_user(user_buf, count, &enable);
251         if (err)
252                 return err;
253
254         if (!enable)
255                 return -EINVAL;
256
257         if (vhci->aosp_capable)
258                 return -EALREADY;
259
260         vhci->aosp_capable = enable;
261
262         return count;
263 }
264
265 static const struct file_operations aosp_capable_fops = {
266         .open           = simple_open,
267         .read           = aosp_capable_read,
268         .write          = aosp_capable_write,
269         .llseek         = default_llseek,
270 };
271
272 static int vhci_setup(struct hci_dev *hdev)
273 {
274         struct vhci_data *vhci = hci_get_drvdata(hdev);
275
276         if (vhci->msft_opcode)
277                 hci_set_msft_opcode(hdev, vhci->msft_opcode);
278
279         if (vhci->aosp_capable)
280                 hci_set_aosp_capable(hdev);
281
282         return 0;
283 }
284
285 static void vhci_coredump(struct hci_dev *hdev)
286 {
287         /* No need to do anything */
288 }
289
290 static void vhci_coredump_hdr(struct hci_dev *hdev, struct sk_buff *skb)
291 {
292         char buf[80];
293
294         snprintf(buf, sizeof(buf), "Controller Name: vhci_ctrl\n");
295         skb_put_data(skb, buf, strlen(buf));
296
297         snprintf(buf, sizeof(buf), "Firmware Version: vhci_fw\n");
298         skb_put_data(skb, buf, strlen(buf));
299
300         snprintf(buf, sizeof(buf), "Driver: vhci_drv\n");
301         skb_put_data(skb, buf, strlen(buf));
302
303         snprintf(buf, sizeof(buf), "Vendor: vhci\n");
304         skb_put_data(skb, buf, strlen(buf));
305 }
306
307 #define MAX_COREDUMP_LINE_LEN   40
308
309 struct devcoredump_test_data {
310         enum devcoredump_state state;
311         unsigned int timeout;
312         char data[MAX_COREDUMP_LINE_LEN];
313 };
314
315 static inline void force_devcd_timeout(struct hci_dev *hdev,
316                                        unsigned int timeout)
317 {
318 #ifdef CONFIG_DEV_COREDUMP
319         hdev->dump.timeout = msecs_to_jiffies(timeout * 1000);
320 #endif
321 }
322
323 static ssize_t force_devcd_write(struct file *file, const char __user *user_buf,
324                                  size_t count, loff_t *ppos)
325 {
326         struct vhci_data *data = file->private_data;
327         struct hci_dev *hdev = data->hdev;
328         struct sk_buff *skb = NULL;
329         struct devcoredump_test_data dump_data;
330         size_t data_size;
331         int ret;
332
333         if (count < offsetof(struct devcoredump_test_data, data) ||
334             count > sizeof(dump_data))
335                 return -EINVAL;
336
337         if (copy_from_user(&dump_data, user_buf, count))
338                 return -EFAULT;
339
340         data_size = count - offsetof(struct devcoredump_test_data, data);
341         skb = alloc_skb(data_size, GFP_ATOMIC);
342         if (!skb)
343                 return -ENOMEM;
344         skb_put_data(skb, &dump_data.data, data_size);
345
346         hci_devcd_register(hdev, vhci_coredump, vhci_coredump_hdr, NULL);
347
348         /* Force the devcoredump timeout */
349         if (dump_data.timeout)
350                 force_devcd_timeout(hdev, dump_data.timeout);
351
352         ret = hci_devcd_init(hdev, skb->len);
353         if (ret) {
354                 BT_ERR("Failed to generate devcoredump");
355                 kfree_skb(skb);
356                 return ret;
357         }
358
359         hci_devcd_append(hdev, skb);
360
361         switch (dump_data.state) {
362         case HCI_DEVCOREDUMP_DONE:
363                 hci_devcd_complete(hdev);
364                 break;
365         case HCI_DEVCOREDUMP_ABORT:
366                 hci_devcd_abort(hdev);
367                 break;
368         case HCI_DEVCOREDUMP_TIMEOUT:
369                 /* Do nothing */
370                 break;
371         default:
372                 return -EINVAL;
373         }
374
375         return count;
376 }
377
378 static const struct file_operations force_devcoredump_fops = {
379         .open           = simple_open,
380         .write          = force_devcd_write,
381 };
382
383 static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
384 {
385         struct hci_dev *hdev;
386         struct sk_buff *skb;
387
388         if (data->hdev)
389                 return -EBADFD;
390
391         /* bits 2-5 are reserved (must be zero) */
392         if (opcode & 0x3c)
393                 return -EINVAL;
394
395         skb = bt_skb_alloc(4, GFP_KERNEL);
396         if (!skb)
397                 return -ENOMEM;
398
399         hdev = hci_alloc_dev();
400         if (!hdev) {
401                 kfree_skb(skb);
402                 return -ENOMEM;
403         }
404
405         data->hdev = hdev;
406
407         hdev->bus = HCI_VIRTUAL;
408         hci_set_drvdata(hdev, data);
409
410         hdev->open  = vhci_open_dev;
411         hdev->close = vhci_close_dev;
412         hdev->flush = vhci_flush;
413         hdev->send  = vhci_send_frame;
414         hdev->get_data_path_id = vhci_get_data_path_id;
415         hdev->get_codec_config_data = vhci_get_codec_config_data;
416         hdev->wakeup = vhci_wakeup;
417         hdev->setup = vhci_setup;
418         set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
419
420         /* bit 6 is for external configuration */
421         if (opcode & 0x40)
422                 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
423
424         /* bit 7 is for raw device */
425         if (opcode & 0x80)
426                 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
427
428         if (hci_register_dev(hdev) < 0) {
429                 BT_ERR("Can't register HCI device");
430                 hci_free_dev(hdev);
431                 data->hdev = NULL;
432                 kfree_skb(skb);
433                 return -EBUSY;
434         }
435
436         debugfs_create_file("force_suspend", 0644, hdev->debugfs, data,
437                             &force_suspend_fops);
438
439         debugfs_create_file("force_wakeup", 0644, hdev->debugfs, data,
440                             &force_wakeup_fops);
441
442         if (IS_ENABLED(CONFIG_BT_MSFTEXT))
443                 debugfs_create_file("msft_opcode", 0644, hdev->debugfs, data,
444                                     &msft_opcode_fops);
445
446         if (IS_ENABLED(CONFIG_BT_AOSPEXT))
447                 debugfs_create_file("aosp_capable", 0644, hdev->debugfs, data,
448                                     &aosp_capable_fops);
449
450         debugfs_create_file("force_devcoredump", 0644, hdev->debugfs, data,
451                             &force_devcoredump_fops);
452
453         hci_skb_pkt_type(skb) = HCI_VENDOR_PKT;
454
455         skb_put_u8(skb, 0xff);
456         skb_put_u8(skb, opcode);
457         put_unaligned_le16(hdev->id, skb_put(skb, 2));
458         skb_queue_head(&data->readq, skb);
459         atomic_inc(&data->initialized);
460
461         wake_up_interruptible(&data->read_wait);
462         return 0;
463 }
464
465 static int vhci_create_device(struct vhci_data *data, __u8 opcode)
466 {
467         int err;
468
469         mutex_lock(&data->open_mutex);
470         err = __vhci_create_device(data, opcode);
471         mutex_unlock(&data->open_mutex);
472
473         return err;
474 }
475
476 static inline ssize_t vhci_get_user(struct vhci_data *data,
477                                     struct iov_iter *from)
478 {
479         size_t len = iov_iter_count(from);
480         struct sk_buff *skb;
481         __u8 pkt_type, opcode;
482         int ret;
483
484         if (len < 2 || len > HCI_MAX_FRAME_SIZE)
485                 return -EINVAL;
486
487         skb = bt_skb_alloc(len, GFP_KERNEL);
488         if (!skb)
489                 return -ENOMEM;
490
491         if (!copy_from_iter_full(skb_put(skb, len), len, from)) {
492                 kfree_skb(skb);
493                 return -EFAULT;
494         }
495
496         pkt_type = *((__u8 *) skb->data);
497         skb_pull(skb, 1);
498
499         switch (pkt_type) {
500         case HCI_EVENT_PKT:
501         case HCI_ACLDATA_PKT:
502         case HCI_SCODATA_PKT:
503         case HCI_ISODATA_PKT:
504                 if (!data->hdev) {
505                         kfree_skb(skb);
506                         return -ENODEV;
507                 }
508
509                 hci_skb_pkt_type(skb) = pkt_type;
510
511                 ret = hci_recv_frame(data->hdev, skb);
512                 break;
513
514         case HCI_VENDOR_PKT:
515                 cancel_delayed_work_sync(&data->open_timeout);
516
517                 opcode = *((__u8 *) skb->data);
518                 skb_pull(skb, 1);
519
520                 if (skb->len > 0) {
521                         kfree_skb(skb);
522                         return -EINVAL;
523                 }
524
525                 kfree_skb(skb);
526
527                 ret = vhci_create_device(data, opcode);
528                 break;
529
530         default:
531                 kfree_skb(skb);
532                 return -EINVAL;
533         }
534
535         return (ret < 0) ? ret : len;
536 }
537
538 static inline ssize_t vhci_put_user(struct vhci_data *data,
539                                     struct sk_buff *skb,
540                                     char __user *buf, int count)
541 {
542         char __user *ptr = buf;
543         int len;
544
545         len = min_t(unsigned int, skb->len, count);
546
547         if (copy_to_user(ptr, skb->data, len))
548                 return -EFAULT;
549
550         if (!data->hdev)
551                 return len;
552
553         data->hdev->stat.byte_tx += len;
554
555         switch (hci_skb_pkt_type(skb)) {
556         case HCI_COMMAND_PKT:
557                 data->hdev->stat.cmd_tx++;
558                 break;
559         case HCI_ACLDATA_PKT:
560                 data->hdev->stat.acl_tx++;
561                 break;
562         case HCI_SCODATA_PKT:
563                 data->hdev->stat.sco_tx++;
564                 break;
565         }
566
567         return len;
568 }
569
570 static ssize_t vhci_read(struct file *file,
571                          char __user *buf, size_t count, loff_t *pos)
572 {
573         struct vhci_data *data = file->private_data;
574         struct sk_buff *skb;
575         ssize_t ret = 0;
576
577         while (count) {
578                 skb = skb_dequeue(&data->readq);
579                 if (skb) {
580                         ret = vhci_put_user(data, skb, buf, count);
581                         if (ret < 0)
582                                 skb_queue_head(&data->readq, skb);
583                         else
584                                 kfree_skb(skb);
585                         break;
586                 }
587
588                 if (file->f_flags & O_NONBLOCK) {
589                         ret = -EAGAIN;
590                         break;
591                 }
592
593                 ret = wait_event_interruptible(data->read_wait,
594                                                !skb_queue_empty(&data->readq));
595                 if (ret < 0)
596                         break;
597         }
598
599         return ret;
600 }
601
602 static ssize_t vhci_write(struct kiocb *iocb, struct iov_iter *from)
603 {
604         struct file *file = iocb->ki_filp;
605         struct vhci_data *data = file->private_data;
606
607         return vhci_get_user(data, from);
608 }
609
610 static __poll_t vhci_poll(struct file *file, poll_table *wait)
611 {
612         struct vhci_data *data = file->private_data;
613
614         poll_wait(file, &data->read_wait, wait);
615
616         if (!skb_queue_empty(&data->readq))
617                 return EPOLLIN | EPOLLRDNORM;
618
619         return EPOLLOUT | EPOLLWRNORM;
620 }
621
622 static void vhci_open_timeout(struct work_struct *work)
623 {
624         struct vhci_data *data = container_of(work, struct vhci_data,
625                                               open_timeout.work);
626
627         vhci_create_device(data, 0x00);
628 }
629
630 static int vhci_open(struct inode *inode, struct file *file)
631 {
632         struct vhci_data *data;
633
634         data = kzalloc(sizeof(*data), GFP_KERNEL);
635         if (!data)
636                 return -ENOMEM;
637
638         skb_queue_head_init(&data->readq);
639         init_waitqueue_head(&data->read_wait);
640
641         mutex_init(&data->open_mutex);
642         INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout);
643         INIT_WORK(&data->suspend_work, vhci_suspend_work);
644
645         file->private_data = data;
646         nonseekable_open(inode, file);
647
648         schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000));
649
650         return 0;
651 }
652
653 static int vhci_release(struct inode *inode, struct file *file)
654 {
655         struct vhci_data *data = file->private_data;
656         struct hci_dev *hdev;
657
658         cancel_delayed_work_sync(&data->open_timeout);
659         flush_work(&data->suspend_work);
660
661         hdev = data->hdev;
662
663         if (hdev) {
664                 hci_unregister_dev(hdev);
665                 hci_free_dev(hdev);
666         }
667
668         skb_queue_purge(&data->readq);
669         file->private_data = NULL;
670         kfree(data);
671
672         return 0;
673 }
674
675 static const struct file_operations vhci_fops = {
676         .owner          = THIS_MODULE,
677         .read           = vhci_read,
678         .write_iter     = vhci_write,
679         .poll           = vhci_poll,
680         .open           = vhci_open,
681         .release        = vhci_release,
682 };
683
684 static struct miscdevice vhci_miscdev = {
685         .name   = "vhci",
686         .fops   = &vhci_fops,
687         .minor  = VHCI_MINOR,
688 };
689 module_misc_device(vhci_miscdev);
690
691 module_param(amp, bool, 0644);
692 MODULE_PARM_DESC(amp, "Create AMP controller device");
693
694 MODULE_AUTHOR("Marcel Holtmann <[email protected]>");
695 MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
696 MODULE_VERSION(VERSION);
697 MODULE_LICENSE("GPL");
698 MODULE_ALIAS("devname:vhci");
699 MODULE_ALIAS_MISCDEV(VHCI_MINOR);
This page took 0.072752 seconds and 4 git commands to generate.