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#include <linux/module.h>
27
28#include <linux/kernel.h>
29#include <linux/init.h>
30#include <linux/slab.h>
31#include <linux/types.h>
32#include <linux/errno.h>
33#include <linux/sched.h>
34#include <linux/poll.h>
35
36#include <linux/skbuff.h>
37#include <linux/miscdevice.h>
38
39#include <net/bluetooth/bluetooth.h>
40#include <net/bluetooth/hci_core.h>
41
42#define VERSION "1.3"
43
44static int minor = MISC_DYNAMIC_MINOR;
45
46struct vhci_data {
47 struct hci_dev *hdev;
48
49 unsigned long flags;
50
51 wait_queue_head_t read_wait;
52 struct sk_buff_head readq;
53};
54
55static int vhci_open_dev(struct hci_dev *hdev)
56{
57 set_bit(HCI_RUNNING, &hdev->flags);
58
59 return 0;
60}
61
62static int vhci_close_dev(struct hci_dev *hdev)
63{
64 struct vhci_data *data = hdev->driver_data;
65
66 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
67 return 0;
68
69 skb_queue_purge(&data->readq);
70
71 return 0;
72}
73
74static int vhci_flush(struct hci_dev *hdev)
75{
76 struct vhci_data *data = hdev->driver_data;
77
78 skb_queue_purge(&data->readq);
79
80 return 0;
81}
82
83static int vhci_send_frame(struct sk_buff *skb)
84{
85 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
86 struct vhci_data *data;
87
88 if (!hdev) {
89 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
90 return -ENODEV;
91 }
92
93 if (!test_bit(HCI_RUNNING, &hdev->flags))
94 return -EBUSY;
95
96 data = hdev->driver_data;
97
98 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
99 skb_queue_tail(&data->readq, skb);
100
101 wake_up_interruptible(&data->read_wait);
102
103 return 0;
104}
105
106static void vhci_destruct(struct hci_dev *hdev)
107{
108 kfree(hdev->driver_data);
109}
110
111static inline ssize_t vhci_get_user(struct vhci_data *data,
112 const char __user *buf, size_t count)
113{
114 struct sk_buff *skb;
115
116 if (count > HCI_MAX_FRAME_SIZE)
117 return -EINVAL;
118
119 skb = bt_skb_alloc(count, GFP_KERNEL);
120 if (!skb)
121 return -ENOMEM;
122
123 if (copy_from_user(skb_put(skb, count), buf, count)) {
124 kfree_skb(skb);
125 return -EFAULT;
126 }
127
128 skb->dev = (void *) data->hdev;
129 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
130 skb_pull(skb, 1);
131
132 hci_recv_frame(skb);
133
134 return count;
135}
136
137static inline ssize_t vhci_put_user(struct vhci_data *data,
138 struct sk_buff *skb, char __user *buf, int count)
139{
140 char __user *ptr = buf;
141 int len, total = 0;
142
143 len = min_t(unsigned int, skb->len, count);
144
145 if (copy_to_user(ptr, skb->data, len))
146 return -EFAULT;
147
148 total += len;
149
150 data->hdev->stat.byte_tx += len;
151
152 switch (bt_cb(skb)->pkt_type) {
153 case HCI_COMMAND_PKT:
154 data->hdev->stat.cmd_tx++;
155 break;
156
157 case HCI_ACLDATA_PKT:
158 data->hdev->stat.acl_tx++;
159 break;
160
161 case HCI_SCODATA_PKT:
162 data->hdev->stat.cmd_tx++;
163 break;
164 };
165
166 return total;
167}
168
169static ssize_t vhci_read(struct file *file,
170 char __user *buf, size_t count, loff_t *pos)
171{
172 struct vhci_data *data = file->private_data;
173 struct sk_buff *skb;
174 ssize_t ret = 0;
175
176 while (count) {
177 skb = skb_dequeue(&data->readq);
178 if (skb) {
179 ret = vhci_put_user(data, skb, buf, count);
180 if (ret < 0)
181 skb_queue_head(&data->readq, skb);
182 else
183 kfree_skb(skb);
184 break;
185 }
186
187 if (file->f_flags & O_NONBLOCK) {
188 ret = -EAGAIN;
189 break;
190 }
191
192 ret = wait_event_interruptible(data->read_wait,
193 !skb_queue_empty(&data->readq));
194 if (ret < 0)
195 break;
196 }
197
198 return ret;
199}
200
201static ssize_t vhci_write(struct file *file,
202 const char __user *buf, size_t count, loff_t *pos)
203{
204 struct vhci_data *data = file->private_data;
205
206 return vhci_get_user(data, buf, count);
207}
208
209static unsigned int vhci_poll(struct file *file, poll_table *wait)
210{
211 struct vhci_data *data = file->private_data;
212
213 poll_wait(file, &data->read_wait, wait);
214
215 if (!skb_queue_empty(&data->readq))
216 return POLLIN | POLLRDNORM;
217
218 return POLLOUT | POLLWRNORM;
219}
220
221static int vhci_ioctl(struct inode *inode, struct file *file,
222 unsigned int cmd, unsigned long arg)
223{
224 return -EINVAL;
225}
226
227static int vhci_open(struct inode *inode, struct file *file)
228{
229 struct vhci_data *data;
230 struct hci_dev *hdev;
231
232 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
233 if (!data)
234 return -ENOMEM;
235
236 skb_queue_head_init(&data->readq);
237 init_waitqueue_head(&data->read_wait);
238
239 hdev = hci_alloc_dev();
240 if (!hdev) {
241 kfree(data);
242 return -ENOMEM;
243 }
244
245 data->hdev = hdev;
246
247 hdev->type = HCI_VIRTUAL;
248 hdev->driver_data = data;
249
250 hdev->open = vhci_open_dev;
251 hdev->close = vhci_close_dev;
252 hdev->flush = vhci_flush;
253 hdev->send = vhci_send_frame;
254 hdev->destruct = vhci_destruct;
255
256 hdev->owner = THIS_MODULE;
257
258 if (hci_register_dev(hdev) < 0) {
259 BT_ERR("Can't register HCI device");
260 kfree(data);
261 hci_free_dev(hdev);
262 return -EBUSY;
263 }
264
265 file->private_data = data;
266
267 return nonseekable_open(inode, file);
268}
269
270static int vhci_release(struct inode *inode, struct file *file)
271{
272 struct vhci_data *data = file->private_data;
273 struct hci_dev *hdev = data->hdev;
274
275 if (hci_unregister_dev(hdev) < 0) {
276 BT_ERR("Can't unregister HCI device %s", hdev->name);
277 }
278
279 hci_free_dev(hdev);
280
281 file->private_data = NULL;
282
283 return 0;
284}
285
286static const struct file_operations vhci_fops = {
287 .read = vhci_read,
288 .write = vhci_write,
289 .poll = vhci_poll,
290 .ioctl = vhci_ioctl,
291 .open = vhci_open,
292 .release = vhci_release,
293};
294
295static struct miscdevice vhci_miscdev= {
296 .name = "vhci",
297 .fops = &vhci_fops,
298 .minor = MISC_DYNAMIC_MINOR,
299};
300
301static int __init vhci_init(void)
302{
303 BT_INFO("Virtual HCI driver ver %s", VERSION);
304
305 if (misc_register(&vhci_miscdev) < 0) {
306 BT_ERR("Can't register misc device with minor %d", minor);
307 return -EIO;
308 }
309
310 return 0;
311}
312
313static void __exit vhci_exit(void)
314{
315 if (misc_deregister(&vhci_miscdev) < 0)
316 BT_ERR("Can't unregister misc device with minor %d", minor);
317}
318
319module_init(vhci_init);
320module_exit(vhci_exit);
321
322MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
323MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
324MODULE_VERSION(VERSION);
325MODULE_LICENSE("GPL");
326
