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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 <maxk@qualcomm.com>
8 * Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org>
9 */
10
11#include <linux/module.h>
12#include <asm/unaligned.h>
13
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <linux/types.h>
18#include <linux/errno.h>
19#include <linux/sched.h>
20#include <linux/poll.h>
21
22#include <linux/skbuff.h>
23#include <linux/miscdevice.h>
24
25#include <net/bluetooth/bluetooth.h>
26#include <net/bluetooth/hci_core.h>
27
28#define VERSION "1.5"
29
30static bool amp;
31
32struct vhci_data {
33 struct hci_dev *hdev;
34
35 wait_queue_head_t read_wait;
36 struct sk_buff_head readq;
37
38 struct mutex open_mutex;
39 struct delayed_work open_timeout;
40};
41
42static int vhci_open_dev(struct hci_dev *hdev)
43{
44 return 0;
45}
46
47static int vhci_close_dev(struct hci_dev *hdev)
48{
49 struct vhci_data *data = hci_get_drvdata(hdev);
50
51 skb_queue_purge(&data->readq);
52
53 return 0;
54}
55
56static int vhci_flush(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
65static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
66{
67 struct vhci_data *data = hci_get_drvdata(hdev);
68
69 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
70 skb_queue_tail(&data->readq, skb);
71
72 wake_up_interruptible(&data->read_wait);
73 return 0;
74}
75
76static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
77{
78 struct hci_dev *hdev;
79 struct sk_buff *skb;
80 __u8 dev_type;
81
82 if (data->hdev)
83 return -EBADFD;
84
85 /* bits 0-1 are dev_type (Primary or AMP) */
86 dev_type = opcode & 0x03;
87
88 if (dev_type != HCI_PRIMARY && dev_type != HCI_AMP)
89 return -EINVAL;
90
91 /* bits 2-5 are reserved (must be zero) */
92 if (opcode & 0x3c)
93 return -EINVAL;
94
95 skb = bt_skb_alloc(4, GFP_KERNEL);
96 if (!skb)
97 return -ENOMEM;
98
99 hdev = hci_alloc_dev();
100 if (!hdev) {
101 kfree_skb(skb);
102 return -ENOMEM;
103 }
104
105 data->hdev = hdev;
106
107 hdev->bus = HCI_VIRTUAL;
108 hdev->dev_type = dev_type;
109 hci_set_drvdata(hdev, data);
110
111 hdev->open = vhci_open_dev;
112 hdev->close = vhci_close_dev;
113 hdev->flush = vhci_flush;
114 hdev->send = vhci_send_frame;
115
116 /* bit 6 is for external configuration */
117 if (opcode & 0x40)
118 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
119
120 /* bit 7 is for raw device */
121 if (opcode & 0x80)
122 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
123
124 if (hci_register_dev(hdev) < 0) {
125 BT_ERR("Can't register HCI device");
126 hci_free_dev(hdev);
127 data->hdev = NULL;
128 kfree_skb(skb);
129 return -EBUSY;
130 }
131
132 hci_skb_pkt_type(skb) = HCI_VENDOR_PKT;
133
134 skb_put_u8(skb, 0xff);
135 skb_put_u8(skb, opcode);
136 put_unaligned_le16(hdev->id, skb_put(skb, 2));
137 skb_queue_tail(&data->readq, skb);
138
139 wake_up_interruptible(&data->read_wait);
140 return 0;
141}
142
143static int vhci_create_device(struct vhci_data *data, __u8 opcode)
144{
145 int err;
146
147 mutex_lock(&data->open_mutex);
148 err = __vhci_create_device(data, opcode);
149 mutex_unlock(&data->open_mutex);
150
151 return err;
152}
153
154static inline ssize_t vhci_get_user(struct vhci_data *data,
155 struct iov_iter *from)
156{
157 size_t len = iov_iter_count(from);
158 struct sk_buff *skb;
159 __u8 pkt_type, opcode;
160 int ret;
161
162 if (len < 2 || len > HCI_MAX_FRAME_SIZE)
163 return -EINVAL;
164
165 skb = bt_skb_alloc(len, GFP_KERNEL);
166 if (!skb)
167 return -ENOMEM;
168
169 if (!copy_from_iter_full(skb_put(skb, len), len, from)) {
170 kfree_skb(skb);
171 return -EFAULT;
172 }
173
174 pkt_type = *((__u8 *) skb->data);
175 skb_pull(skb, 1);
176
177 switch (pkt_type) {
178 case HCI_EVENT_PKT:
179 case HCI_ACLDATA_PKT:
180 case HCI_SCODATA_PKT:
181 case HCI_ISODATA_PKT:
182 if (!data->hdev) {
183 kfree_skb(skb);
184 return -ENODEV;
185 }
186
187 hci_skb_pkt_type(skb) = pkt_type;
188
189 ret = hci_recv_frame(data->hdev, skb);
190 break;
191
192 case HCI_VENDOR_PKT:
193 cancel_delayed_work_sync(&data->open_timeout);
194
195 opcode = *((__u8 *) skb->data);
196 skb_pull(skb, 1);
197
198 if (skb->len > 0) {
199 kfree_skb(skb);
200 return -EINVAL;
201 }
202
203 kfree_skb(skb);
204
205 ret = vhci_create_device(data, opcode);
206 break;
207
208 default:
209 kfree_skb(skb);
210 return -EINVAL;
211 }
212
213 return (ret < 0) ? ret : len;
214}
215
216static inline ssize_t vhci_put_user(struct vhci_data *data,
217 struct sk_buff *skb,
218 char __user *buf, int count)
219{
220 char __user *ptr = buf;
221 int len;
222
223 len = min_t(unsigned int, skb->len, count);
224
225 if (copy_to_user(ptr, skb->data, len))
226 return -EFAULT;
227
228 if (!data->hdev)
229 return len;
230
231 data->hdev->stat.byte_tx += len;
232
233 switch (hci_skb_pkt_type(skb)) {
234 case HCI_COMMAND_PKT:
235 data->hdev->stat.cmd_tx++;
236 break;
237 case HCI_ACLDATA_PKT:
238 data->hdev->stat.acl_tx++;
239 break;
240 case HCI_SCODATA_PKT:
241 data->hdev->stat.sco_tx++;
242 break;
243 }
244
245 return len;
246}
247
248static ssize_t vhci_read(struct file *file,
249 char __user *buf, size_t count, loff_t *pos)
250{
251 struct vhci_data *data = file->private_data;
252 struct sk_buff *skb;
253 ssize_t ret = 0;
254
255 while (count) {
256 skb = skb_dequeue(&data->readq);
257 if (skb) {
258 ret = vhci_put_user(data, skb, buf, count);
259 if (ret < 0)
260 skb_queue_head(&data->readq, skb);
261 else
262 kfree_skb(skb);
263 break;
264 }
265
266 if (file->f_flags & O_NONBLOCK) {
267 ret = -EAGAIN;
268 break;
269 }
270
271 ret = wait_event_interruptible(data->read_wait,
272 !skb_queue_empty(&data->readq));
273 if (ret < 0)
274 break;
275 }
276
277 return ret;
278}
279
280static ssize_t vhci_write(struct kiocb *iocb, struct iov_iter *from)
281{
282 struct file *file = iocb->ki_filp;
283 struct vhci_data *data = file->private_data;
284
285 return vhci_get_user(data, from);
286}
287
288static __poll_t vhci_poll(struct file *file, poll_table *wait)
289{
290 struct vhci_data *data = file->private_data;
291
292 poll_wait(file, &data->read_wait, wait);
293
294 if (!skb_queue_empty(&data->readq))
295 return EPOLLIN | EPOLLRDNORM;
296
297 return EPOLLOUT | EPOLLWRNORM;
298}
299
300static void vhci_open_timeout(struct work_struct *work)
301{
302 struct vhci_data *data = container_of(work, struct vhci_data,
303 open_timeout.work);
304
305 vhci_create_device(data, amp ? HCI_AMP : HCI_PRIMARY);
306}
307
308static int vhci_open(struct inode *inode, struct file *file)
309{
310 struct vhci_data *data;
311
312 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
313 if (!data)
314 return -ENOMEM;
315
316 skb_queue_head_init(&data->readq);
317 init_waitqueue_head(&data->read_wait);
318
319 mutex_init(&data->open_mutex);
320 INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout);
321
322 file->private_data = data;
323 nonseekable_open(inode, file);
324
325 schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000));
326
327 return 0;
328}
329
330static int vhci_release(struct inode *inode, struct file *file)
331{
332 struct vhci_data *data = file->private_data;
333 struct hci_dev *hdev;
334
335 cancel_delayed_work_sync(&data->open_timeout);
336
337 hdev = data->hdev;
338
339 if (hdev) {
340 hci_unregister_dev(hdev);
341 hci_free_dev(hdev);
342 }
343
344 skb_queue_purge(&data->readq);
345 file->private_data = NULL;
346 kfree(data);
347
348 return 0;
349}
350
351static const struct file_operations vhci_fops = {
352 .owner = THIS_MODULE,
353 .read = vhci_read,
354 .write_iter = vhci_write,
355 .poll = vhci_poll,
356 .open = vhci_open,
357 .release = vhci_release,
358 .llseek = no_llseek,
359};
360
361static struct miscdevice vhci_miscdev = {
362 .name = "vhci",
363 .fops = &vhci_fops,
364 .minor = VHCI_MINOR,
365};
366module_misc_device(vhci_miscdev);
367
368module_param(amp, bool, 0644);
369MODULE_PARM_DESC(amp, "Create AMP controller device");
370
371MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
372MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
373MODULE_VERSION(VERSION);
374MODULE_LICENSE("GPL");
375MODULE_ALIAS("devname:vhci");
376MODULE_ALIAS_MISCDEV(VHCI_MINOR);
1/*
2 *
3 * Bluetooth virtual HCI driver
4 *
5 * Copyright (C) 2000-2001 Qualcomm Incorporated
6 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
7 * Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org>
8 *
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25
26#include <linux/module.h>
27#include <asm/unaligned.h>
28
29#include <linux/kernel.h>
30#include <linux/init.h>
31#include <linux/slab.h>
32#include <linux/types.h>
33#include <linux/errno.h>
34#include <linux/sched.h>
35#include <linux/poll.h>
36
37#include <linux/skbuff.h>
38#include <linux/miscdevice.h>
39
40#include <net/bluetooth/bluetooth.h>
41#include <net/bluetooth/hci_core.h>
42
43#define VERSION "1.4"
44
45static bool amp;
46
47struct vhci_data {
48 struct hci_dev *hdev;
49
50 wait_queue_head_t read_wait;
51 struct sk_buff_head readq;
52
53 struct delayed_work open_timeout;
54};
55
56static int vhci_open_dev(struct hci_dev *hdev)
57{
58 set_bit(HCI_RUNNING, &hdev->flags);
59
60 return 0;
61}
62
63static int vhci_close_dev(struct hci_dev *hdev)
64{
65 struct vhci_data *data = hci_get_drvdata(hdev);
66
67 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
68 return 0;
69
70 skb_queue_purge(&data->readq);
71
72 return 0;
73}
74
75static int vhci_flush(struct hci_dev *hdev)
76{
77 struct vhci_data *data = hci_get_drvdata(hdev);
78
79 skb_queue_purge(&data->readq);
80
81 return 0;
82}
83
84static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
85{
86 struct vhci_data *data = hci_get_drvdata(hdev);
87
88 if (!test_bit(HCI_RUNNING, &hdev->flags))
89 return -EBUSY;
90
91 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
92 skb_queue_tail(&data->readq, skb);
93
94 wake_up_interruptible(&data->read_wait);
95 return 0;
96}
97
98static int vhci_create_device(struct vhci_data *data, __u8 dev_type)
99{
100 struct hci_dev *hdev;
101 struct sk_buff *skb;
102
103 skb = bt_skb_alloc(4, GFP_KERNEL);
104 if (!skb)
105 return -ENOMEM;
106
107 hdev = hci_alloc_dev();
108 if (!hdev) {
109 kfree_skb(skb);
110 return -ENOMEM;
111 }
112
113 data->hdev = hdev;
114
115 hdev->bus = HCI_VIRTUAL;
116 hdev->dev_type = dev_type;
117 hci_set_drvdata(hdev, data);
118
119 hdev->open = vhci_open_dev;
120 hdev->close = vhci_close_dev;
121 hdev->flush = vhci_flush;
122 hdev->send = vhci_send_frame;
123
124 if (hci_register_dev(hdev) < 0) {
125 BT_ERR("Can't register HCI device");
126 hci_free_dev(hdev);
127 data->hdev = NULL;
128 kfree_skb(skb);
129 return -EBUSY;
130 }
131
132 bt_cb(skb)->pkt_type = HCI_VENDOR_PKT;
133
134 *skb_put(skb, 1) = 0xff;
135 *skb_put(skb, 1) = dev_type;
136 put_unaligned_le16(hdev->id, skb_put(skb, 2));
137 skb_queue_tail(&data->readq, skb);
138
139 wake_up_interruptible(&data->read_wait);
140 return 0;
141}
142
143static inline ssize_t vhci_get_user(struct vhci_data *data,
144 const struct iovec *iov,
145 unsigned long count)
146{
147 size_t len = iov_length(iov, count);
148 struct sk_buff *skb;
149 __u8 pkt_type, dev_type;
150 unsigned long i;
151 int ret;
152
153 if (len < 2 || len > HCI_MAX_FRAME_SIZE)
154 return -EINVAL;
155
156 skb = bt_skb_alloc(len, GFP_KERNEL);
157 if (!skb)
158 return -ENOMEM;
159
160 for (i = 0; i < count; i++) {
161 if (copy_from_user(skb_put(skb, iov[i].iov_len),
162 iov[i].iov_base, iov[i].iov_len)) {
163 kfree_skb(skb);
164 return -EFAULT;
165 }
166 }
167
168 pkt_type = *((__u8 *) skb->data);
169 skb_pull(skb, 1);
170
171 switch (pkt_type) {
172 case HCI_EVENT_PKT:
173 case HCI_ACLDATA_PKT:
174 case HCI_SCODATA_PKT:
175 if (!data->hdev) {
176 kfree_skb(skb);
177 return -ENODEV;
178 }
179
180 bt_cb(skb)->pkt_type = pkt_type;
181
182 ret = hci_recv_frame(data->hdev, skb);
183 break;
184
185 case HCI_VENDOR_PKT:
186 if (data->hdev) {
187 kfree_skb(skb);
188 return -EBADFD;
189 }
190
191 cancel_delayed_work_sync(&data->open_timeout);
192
193 dev_type = *((__u8 *) skb->data);
194 skb_pull(skb, 1);
195
196 if (skb->len > 0) {
197 kfree_skb(skb);
198 return -EINVAL;
199 }
200
201 kfree_skb(skb);
202
203 if (dev_type != HCI_BREDR && dev_type != HCI_AMP)
204 return -EINVAL;
205
206 ret = vhci_create_device(data, dev_type);
207 break;
208
209 default:
210 kfree_skb(skb);
211 return -EINVAL;
212 }
213
214 return (ret < 0) ? ret : len;
215}
216
217static inline ssize_t vhci_put_user(struct vhci_data *data,
218 struct sk_buff *skb,
219 char __user *buf, int count)
220{
221 char __user *ptr = buf;
222 int len;
223
224 len = min_t(unsigned int, skb->len, count);
225
226 if (copy_to_user(ptr, skb->data, len))
227 return -EFAULT;
228
229 if (!data->hdev)
230 return len;
231
232 data->hdev->stat.byte_tx += len;
233
234 switch (bt_cb(skb)->pkt_type) {
235 case HCI_COMMAND_PKT:
236 data->hdev->stat.cmd_tx++;
237 break;
238 case HCI_ACLDATA_PKT:
239 data->hdev->stat.acl_tx++;
240 break;
241 case HCI_SCODATA_PKT:
242 data->hdev->stat.sco_tx++;
243 break;
244 }
245
246 return len;
247}
248
249static ssize_t vhci_read(struct file *file,
250 char __user *buf, size_t count, loff_t *pos)
251{
252 struct vhci_data *data = file->private_data;
253 struct sk_buff *skb;
254 ssize_t ret = 0;
255
256 while (count) {
257 skb = skb_dequeue(&data->readq);
258 if (skb) {
259 ret = vhci_put_user(data, skb, buf, count);
260 if (ret < 0)
261 skb_queue_head(&data->readq, skb);
262 else
263 kfree_skb(skb);
264 break;
265 }
266
267 if (file->f_flags & O_NONBLOCK) {
268 ret = -EAGAIN;
269 break;
270 }
271
272 ret = wait_event_interruptible(data->read_wait,
273 !skb_queue_empty(&data->readq));
274 if (ret < 0)
275 break;
276 }
277
278 return ret;
279}
280
281static ssize_t vhci_write(struct kiocb *iocb, const struct iovec *iov,
282 unsigned long count, loff_t pos)
283{
284 struct file *file = iocb->ki_filp;
285 struct vhci_data *data = file->private_data;
286
287 return vhci_get_user(data, iov, count);
288}
289
290static unsigned int vhci_poll(struct file *file, poll_table *wait)
291{
292 struct vhci_data *data = file->private_data;
293
294 poll_wait(file, &data->read_wait, wait);
295
296 if (!skb_queue_empty(&data->readq))
297 return POLLIN | POLLRDNORM;
298
299 return POLLOUT | POLLWRNORM;
300}
301
302static void vhci_open_timeout(struct work_struct *work)
303{
304 struct vhci_data *data = container_of(work, struct vhci_data,
305 open_timeout.work);
306
307 vhci_create_device(data, amp ? HCI_AMP : HCI_BREDR);
308}
309
310static int vhci_open(struct inode *inode, struct file *file)
311{
312 struct vhci_data *data;
313
314 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
315 if (!data)
316 return -ENOMEM;
317
318 skb_queue_head_init(&data->readq);
319 init_waitqueue_head(&data->read_wait);
320
321 INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout);
322
323 file->private_data = data;
324 nonseekable_open(inode, file);
325
326 schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000));
327
328 return 0;
329}
330
331static int vhci_release(struct inode *inode, struct file *file)
332{
333 struct vhci_data *data = file->private_data;
334 struct hci_dev *hdev = data->hdev;
335
336 cancel_delayed_work_sync(&data->open_timeout);
337
338 if (hdev) {
339 hci_unregister_dev(hdev);
340 hci_free_dev(hdev);
341 }
342
343 file->private_data = NULL;
344 kfree(data);
345
346 return 0;
347}
348
349static const struct file_operations vhci_fops = {
350 .owner = THIS_MODULE,
351 .read = vhci_read,
352 .aio_write = vhci_write,
353 .poll = vhci_poll,
354 .open = vhci_open,
355 .release = vhci_release,
356 .llseek = no_llseek,
357};
358
359static struct miscdevice vhci_miscdev= {
360 .name = "vhci",
361 .fops = &vhci_fops,
362 .minor = VHCI_MINOR,
363};
364
365static int __init vhci_init(void)
366{
367 BT_INFO("Virtual HCI driver ver %s", VERSION);
368
369 return misc_register(&vhci_miscdev);
370}
371
372static void __exit vhci_exit(void)
373{
374 misc_deregister(&vhci_miscdev);
375}
376
377module_init(vhci_init);
378module_exit(vhci_exit);
379
380module_param(amp, bool, 0644);
381MODULE_PARM_DESC(amp, "Create AMP controller device");
382
383MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
384MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
385MODULE_VERSION(VERSION);
386MODULE_LICENSE("GPL");
387MODULE_ALIAS("devname:vhci");
388MODULE_ALIAS_MISCDEV(VHCI_MINOR);