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Commit | Line | Data |
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8e87d142 | 1 | /* |
1da177e4 LT |
2 | RFCOMM implementation for Linux Bluetooth stack (BlueZ). |
3 | Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org> | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License version 2 as | |
8 | published by the Free Software Foundation; | |
9 | ||
10 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
11 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
12 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
13 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
14 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
15 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
17 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
18 | ||
8e87d142 YH |
19 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
20 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
21 | SOFTWARE IS DISCLAIMED. |
22 | */ | |
23 | ||
24 | /* | |
25 | * RFCOMM TTY. | |
1da177e4 LT |
26 | */ |
27 | ||
1da177e4 LT |
28 | #include <linux/module.h> |
29 | ||
30 | #include <linux/tty.h> | |
31 | #include <linux/tty_driver.h> | |
32 | #include <linux/tty_flip.h> | |
33 | ||
1da177e4 | 34 | #include <net/bluetooth/bluetooth.h> |
0a85b964 | 35 | #include <net/bluetooth/hci_core.h> |
1da177e4 LT |
36 | #include <net/bluetooth/rfcomm.h> |
37 | ||
1da177e4 LT |
38 | #define RFCOMM_TTY_MAGIC 0x6d02 /* magic number for rfcomm struct */ |
39 | #define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */ | |
40 | #define RFCOMM_TTY_MAJOR 216 /* device node major id of the usb/bluetooth.c driver */ | |
41 | #define RFCOMM_TTY_MINOR 0 | |
42 | ||
43 | static struct tty_driver *rfcomm_tty_driver; | |
44 | ||
45 | struct rfcomm_dev { | |
f60db8c4 | 46 | struct tty_port port; |
1da177e4 | 47 | struct list_head list; |
1da177e4 LT |
48 | |
49 | char name[12]; | |
50 | int id; | |
51 | unsigned long flags; | |
1da177e4 LT |
52 | int err; |
53 | ||
54 | bdaddr_t src; | |
55 | bdaddr_t dst; | |
285b4e90 | 56 | u8 channel; |
1da177e4 | 57 | |
285b4e90 | 58 | uint modem_status; |
1da177e4 LT |
59 | |
60 | struct rfcomm_dlc *dlc; | |
1da177e4 | 61 | wait_queue_head_t wait; |
1da177e4 | 62 | |
c1a33136 MH |
63 | struct device *tty_dev; |
64 | ||
285b4e90 | 65 | atomic_t wmem_alloc; |
a0c22f22 MH |
66 | |
67 | struct sk_buff_head pending; | |
1da177e4 LT |
68 | }; |
69 | ||
70 | static LIST_HEAD(rfcomm_dev_list); | |
393432cd | 71 | static DEFINE_SPINLOCK(rfcomm_dev_lock); |
1da177e4 LT |
72 | |
73 | static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb); | |
74 | static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err); | |
75 | static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig); | |
76 | ||
1da177e4 | 77 | /* ---- Device functions ---- */ |
67054019 JS |
78 | |
79 | /* | |
80 | * The reason this isn't actually a race, as you no doubt have a little voice | |
81 | * screaming at you in your head, is that the refcount should never actually | |
82 | * reach zero unless the device has already been taken off the list, in | |
83 | * rfcomm_dev_del(). And if that's not true, we'll hit the BUG() in | |
84 | * rfcomm_dev_destruct() anyway. | |
85 | */ | |
86 | static void rfcomm_dev_destruct(struct tty_port *port) | |
1da177e4 | 87 | { |
67054019 | 88 | struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port); |
1da177e4 LT |
89 | struct rfcomm_dlc *dlc = dev->dlc; |
90 | ||
91 | BT_DBG("dev %p dlc %p", dev, dlc); | |
92 | ||
f951375d DY |
93 | /* Refcount should only hit zero when called from rfcomm_dev_del() |
94 | which will have taken us off the list. Everything else are | |
95 | refcounting bugs. */ | |
96 | BUG_ON(!list_empty(&dev->list)); | |
8de0a154 | 97 | |
1da177e4 LT |
98 | rfcomm_dlc_lock(dlc); |
99 | /* Detach DLC if it's owned by this dev */ | |
100 | if (dlc->owner == dev) | |
101 | dlc->owner = NULL; | |
102 | rfcomm_dlc_unlock(dlc); | |
103 | ||
104 | rfcomm_dlc_put(dlc); | |
105 | ||
106 | tty_unregister_device(rfcomm_tty_driver, dev->id); | |
107 | ||
1da177e4 LT |
108 | kfree(dev); |
109 | ||
8e87d142 | 110 | /* It's safe to call module_put() here because socket still |
1da177e4 LT |
111 | holds reference to this module. */ |
112 | module_put(THIS_MODULE); | |
113 | } | |
114 | ||
67054019 JS |
115 | static const struct tty_port_operations rfcomm_port_ops = { |
116 | .destruct = rfcomm_dev_destruct, | |
117 | }; | |
1da177e4 LT |
118 | |
119 | static struct rfcomm_dev *__rfcomm_dev_get(int id) | |
120 | { | |
121 | struct rfcomm_dev *dev; | |
1da177e4 | 122 | |
8035ded4 | 123 | list_for_each_entry(dev, &rfcomm_dev_list, list) |
1da177e4 LT |
124 | if (dev->id == id) |
125 | return dev; | |
1da177e4 LT |
126 | |
127 | return NULL; | |
128 | } | |
129 | ||
6039aa73 | 130 | static struct rfcomm_dev *rfcomm_dev_get(int id) |
1da177e4 LT |
131 | { |
132 | struct rfcomm_dev *dev; | |
133 | ||
393432cd | 134 | spin_lock(&rfcomm_dev_lock); |
1da177e4 LT |
135 | |
136 | dev = __rfcomm_dev_get(id); | |
8de0a154 VT |
137 | |
138 | if (dev) { | |
139 | if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) | |
140 | dev = NULL; | |
141 | else | |
67054019 | 142 | tty_port_get(&dev->port); |
8de0a154 | 143 | } |
1da177e4 | 144 | |
393432cd | 145 | spin_unlock(&rfcomm_dev_lock); |
1da177e4 LT |
146 | |
147 | return dev; | |
148 | } | |
149 | ||
0a85b964 MH |
150 | static struct device *rfcomm_get_device(struct rfcomm_dev *dev) |
151 | { | |
152 | struct hci_dev *hdev; | |
153 | struct hci_conn *conn; | |
154 | ||
155 | hdev = hci_get_route(&dev->dst, &dev->src); | |
156 | if (!hdev) | |
157 | return NULL; | |
158 | ||
159 | conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst); | |
0a85b964 MH |
160 | |
161 | hci_dev_put(hdev); | |
162 | ||
b2cfcd75 | 163 | return conn ? &conn->dev : NULL; |
0a85b964 MH |
164 | } |
165 | ||
dae6a0f6 MH |
166 | static ssize_t show_address(struct device *tty_dev, struct device_attribute *attr, char *buf) |
167 | { | |
168 | struct rfcomm_dev *dev = dev_get_drvdata(tty_dev); | |
fcb73338 | 169 | return sprintf(buf, "%pMR\n", &dev->dst); |
dae6a0f6 MH |
170 | } |
171 | ||
172 | static ssize_t show_channel(struct device *tty_dev, struct device_attribute *attr, char *buf) | |
173 | { | |
174 | struct rfcomm_dev *dev = dev_get_drvdata(tty_dev); | |
175 | return sprintf(buf, "%d\n", dev->channel); | |
176 | } | |
177 | ||
178 | static DEVICE_ATTR(address, S_IRUGO, show_address, NULL); | |
179 | static DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL); | |
180 | ||
1da177e4 LT |
181 | static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc) |
182 | { | |
8035ded4 | 183 | struct rfcomm_dev *dev, *entry; |
e57d758a | 184 | struct list_head *head = &rfcomm_dev_list; |
1da177e4 LT |
185 | int err = 0; |
186 | ||
187 | BT_DBG("id %d channel %d", req->dev_id, req->channel); | |
8e87d142 | 188 | |
25ea6db0 | 189 | dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL); |
1da177e4 LT |
190 | if (!dev) |
191 | return -ENOMEM; | |
1da177e4 | 192 | |
393432cd | 193 | spin_lock(&rfcomm_dev_lock); |
1da177e4 LT |
194 | |
195 | if (req->dev_id < 0) { | |
196 | dev->id = 0; | |
197 | ||
8035ded4 LAD |
198 | list_for_each_entry(entry, &rfcomm_dev_list, list) { |
199 | if (entry->id != dev->id) | |
1da177e4 LT |
200 | break; |
201 | ||
202 | dev->id++; | |
e57d758a | 203 | head = &entry->list; |
1da177e4 LT |
204 | } |
205 | } else { | |
206 | dev->id = req->dev_id; | |
207 | ||
8035ded4 | 208 | list_for_each_entry(entry, &rfcomm_dev_list, list) { |
1da177e4 LT |
209 | if (entry->id == dev->id) { |
210 | err = -EADDRINUSE; | |
211 | goto out; | |
212 | } | |
213 | ||
214 | if (entry->id > dev->id - 1) | |
215 | break; | |
216 | ||
e57d758a | 217 | head = &entry->list; |
1da177e4 LT |
218 | } |
219 | } | |
220 | ||
221 | if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) { | |
222 | err = -ENFILE; | |
223 | goto out; | |
224 | } | |
225 | ||
226 | sprintf(dev->name, "rfcomm%d", dev->id); | |
227 | ||
228 | list_add(&dev->list, head); | |
1da177e4 LT |
229 | |
230 | bacpy(&dev->src, &req->src); | |
231 | bacpy(&dev->dst, &req->dst); | |
232 | dev->channel = req->channel; | |
233 | ||
8e87d142 | 234 | dev->flags = req->flags & |
1da177e4 LT |
235 | ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC)); |
236 | ||
f60db8c4 | 237 | tty_port_init(&dev->port); |
67054019 | 238 | dev->port.ops = &rfcomm_port_ops; |
1da177e4 | 239 | init_waitqueue_head(&dev->wait); |
1da177e4 | 240 | |
a0c22f22 MH |
241 | skb_queue_head_init(&dev->pending); |
242 | ||
1da177e4 | 243 | rfcomm_dlc_lock(dlc); |
a0c22f22 MH |
244 | |
245 | if (req->flags & (1 << RFCOMM_REUSE_DLC)) { | |
246 | struct sock *sk = dlc->owner; | |
247 | struct sk_buff *skb; | |
248 | ||
249 | BUG_ON(!sk); | |
250 | ||
251 | rfcomm_dlc_throttle(dlc); | |
252 | ||
253 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) { | |
254 | skb_orphan(skb); | |
255 | skb_queue_tail(&dev->pending, skb); | |
256 | atomic_sub(skb->len, &sk->sk_rmem_alloc); | |
257 | } | |
258 | } | |
259 | ||
1da177e4 LT |
260 | dlc->data_ready = rfcomm_dev_data_ready; |
261 | dlc->state_change = rfcomm_dev_state_change; | |
262 | dlc->modem_status = rfcomm_dev_modem_status; | |
263 | ||
264 | dlc->owner = dev; | |
265 | dev->dlc = dlc; | |
8b6b3da7 MH |
266 | |
267 | rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig); | |
268 | ||
1da177e4 LT |
269 | rfcomm_dlc_unlock(dlc); |
270 | ||
8e87d142 | 271 | /* It's safe to call __module_get() here because socket already |
1da177e4 LT |
272 | holds reference to this module. */ |
273 | __module_get(THIS_MODULE); | |
274 | ||
275 | out: | |
393432cd | 276 | spin_unlock(&rfcomm_dev_lock); |
1da177e4 | 277 | |
037322ab IJ |
278 | if (err < 0) |
279 | goto free; | |
1da177e4 | 280 | |
c1a33136 | 281 | dev->tty_dev = tty_register_device(rfcomm_tty_driver, dev->id, NULL); |
1da177e4 | 282 | |
8de0a154 | 283 | if (IS_ERR(dev->tty_dev)) { |
09c7d829 | 284 | err = PTR_ERR(dev->tty_dev); |
8de0a154 | 285 | list_del(&dev->list); |
037322ab | 286 | goto free; |
8de0a154 VT |
287 | } |
288 | ||
dae6a0f6 MH |
289 | dev_set_drvdata(dev->tty_dev, dev); |
290 | ||
291 | if (device_create_file(dev->tty_dev, &dev_attr_address) < 0) | |
292 | BT_ERR("Failed to create address attribute"); | |
293 | ||
294 | if (device_create_file(dev->tty_dev, &dev_attr_channel) < 0) | |
295 | BT_ERR("Failed to create channel attribute"); | |
296 | ||
1da177e4 | 297 | return dev->id; |
037322ab IJ |
298 | |
299 | free: | |
300 | kfree(dev); | |
301 | return err; | |
1da177e4 LT |
302 | } |
303 | ||
304 | static void rfcomm_dev_del(struct rfcomm_dev *dev) | |
305 | { | |
f997a01e | 306 | unsigned long flags; |
1da177e4 LT |
307 | BT_DBG("dev %p", dev); |
308 | ||
9a5df923 MH |
309 | BUG_ON(test_and_set_bit(RFCOMM_TTY_RELEASED, &dev->flags)); |
310 | ||
f997a01e JS |
311 | spin_lock_irqsave(&dev->port.lock, flags); |
312 | if (dev->port.count > 0) { | |
313 | spin_unlock_irqrestore(&dev->port.lock, flags); | |
9a5df923 | 314 | return; |
f997a01e JS |
315 | } |
316 | spin_unlock_irqrestore(&dev->port.lock, flags); | |
f951375d | 317 | |
393432cd | 318 | spin_lock(&rfcomm_dev_lock); |
f951375d | 319 | list_del_init(&dev->list); |
393432cd | 320 | spin_unlock(&rfcomm_dev_lock); |
f951375d | 321 | |
67054019 | 322 | tty_port_put(&dev->port); |
1da177e4 LT |
323 | } |
324 | ||
325 | /* ---- Send buffer ---- */ | |
326 | static inline unsigned int rfcomm_room(struct rfcomm_dlc *dlc) | |
327 | { | |
328 | /* We can't let it be zero, because we don't get a callback | |
329 | when tx_credits becomes nonzero, hence we'd never wake up */ | |
330 | return dlc->mtu * (dlc->tx_credits?:1); | |
331 | } | |
332 | ||
333 | static void rfcomm_wfree(struct sk_buff *skb) | |
334 | { | |
335 | struct rfcomm_dev *dev = (void *) skb->sk; | |
b2c4be39 | 336 | struct tty_struct *tty = dev->port.tty; |
1da177e4 | 337 | atomic_sub(skb->truesize, &dev->wmem_alloc); |
b2c4be39 JS |
338 | if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags) && tty) |
339 | tty_wakeup(tty); | |
67054019 | 340 | tty_port_put(&dev->port); |
1da177e4 LT |
341 | } |
342 | ||
6039aa73 | 343 | static void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev) |
1da177e4 | 344 | { |
67054019 | 345 | tty_port_get(&dev->port); |
1da177e4 LT |
346 | atomic_add(skb->truesize, &dev->wmem_alloc); |
347 | skb->sk = (void *) dev; | |
348 | skb->destructor = rfcomm_wfree; | |
349 | } | |
350 | ||
dd0fc66f | 351 | static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority) |
1da177e4 LT |
352 | { |
353 | if (atomic_read(&dev->wmem_alloc) < rfcomm_room(dev->dlc)) { | |
354 | struct sk_buff *skb = alloc_skb(size, priority); | |
355 | if (skb) { | |
356 | rfcomm_set_owner_w(skb, dev); | |
357 | return skb; | |
358 | } | |
359 | } | |
360 | return NULL; | |
361 | } | |
362 | ||
363 | /* ---- Device IOCTLs ---- */ | |
364 | ||
365 | #define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP)) | |
366 | ||
367 | static int rfcomm_create_dev(struct sock *sk, void __user *arg) | |
368 | { | |
369 | struct rfcomm_dev_req req; | |
370 | struct rfcomm_dlc *dlc; | |
371 | int id; | |
372 | ||
373 | if (copy_from_user(&req, arg, sizeof(req))) | |
374 | return -EFAULT; | |
375 | ||
8de0a154 | 376 | BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags); |
1da177e4 LT |
377 | |
378 | if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) | |
379 | return -EPERM; | |
380 | ||
381 | if (req.flags & (1 << RFCOMM_REUSE_DLC)) { | |
382 | /* Socket must be connected */ | |
383 | if (sk->sk_state != BT_CONNECTED) | |
384 | return -EBADFD; | |
385 | ||
386 | dlc = rfcomm_pi(sk)->dlc; | |
387 | rfcomm_dlc_hold(dlc); | |
388 | } else { | |
389 | dlc = rfcomm_dlc_alloc(GFP_KERNEL); | |
390 | if (!dlc) | |
391 | return -ENOMEM; | |
392 | } | |
393 | ||
394 | id = rfcomm_dev_add(&req, dlc); | |
395 | if (id < 0) { | |
396 | rfcomm_dlc_put(dlc); | |
397 | return id; | |
398 | } | |
399 | ||
400 | if (req.flags & (1 << RFCOMM_REUSE_DLC)) { | |
401 | /* DLC is now used by device. | |
402 | * Socket must be disconnected */ | |
403 | sk->sk_state = BT_CLOSED; | |
404 | } | |
405 | ||
406 | return id; | |
407 | } | |
408 | ||
409 | static int rfcomm_release_dev(void __user *arg) | |
410 | { | |
411 | struct rfcomm_dev_req req; | |
412 | struct rfcomm_dev *dev; | |
413 | ||
414 | if (copy_from_user(&req, arg, sizeof(req))) | |
415 | return -EFAULT; | |
416 | ||
8de0a154 | 417 | BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags); |
1da177e4 | 418 | |
285b4e90 AE |
419 | dev = rfcomm_dev_get(req.dev_id); |
420 | if (!dev) | |
1da177e4 LT |
421 | return -ENODEV; |
422 | ||
423 | if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) { | |
67054019 | 424 | tty_port_put(&dev->port); |
1da177e4 LT |
425 | return -EPERM; |
426 | } | |
427 | ||
428 | if (req.flags & (1 << RFCOMM_HANGUP_NOW)) | |
429 | rfcomm_dlc_close(dev->dlc, 0); | |
430 | ||
84950cf0 | 431 | /* Shut down TTY synchronously before freeing rfcomm_dev */ |
f60db8c4 JS |
432 | if (dev->port.tty) |
433 | tty_vhangup(dev->port.tty); | |
84950cf0 | 434 | |
93d80740 DY |
435 | if (!test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) |
436 | rfcomm_dev_del(dev); | |
67054019 | 437 | tty_port_put(&dev->port); |
1da177e4 LT |
438 | return 0; |
439 | } | |
440 | ||
441 | static int rfcomm_get_dev_list(void __user *arg) | |
442 | { | |
8035ded4 | 443 | struct rfcomm_dev *dev; |
1da177e4 LT |
444 | struct rfcomm_dev_list_req *dl; |
445 | struct rfcomm_dev_info *di; | |
1da177e4 LT |
446 | int n = 0, size, err; |
447 | u16 dev_num; | |
448 | ||
449 | BT_DBG(""); | |
450 | ||
451 | if (get_user(dev_num, (u16 __user *) arg)) | |
452 | return -EFAULT; | |
453 | ||
454 | if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di)) | |
455 | return -EINVAL; | |
456 | ||
457 | size = sizeof(*dl) + dev_num * sizeof(*di); | |
458 | ||
285b4e90 AE |
459 | dl = kmalloc(size, GFP_KERNEL); |
460 | if (!dl) | |
1da177e4 LT |
461 | return -ENOMEM; |
462 | ||
463 | di = dl->dev_info; | |
464 | ||
393432cd | 465 | spin_lock(&rfcomm_dev_lock); |
1da177e4 | 466 | |
8035ded4 | 467 | list_for_each_entry(dev, &rfcomm_dev_list, list) { |
8de0a154 VT |
468 | if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) |
469 | continue; | |
1da177e4 LT |
470 | (di + n)->id = dev->id; |
471 | (di + n)->flags = dev->flags; | |
472 | (di + n)->state = dev->dlc->state; | |
473 | (di + n)->channel = dev->channel; | |
474 | bacpy(&(di + n)->src, &dev->src); | |
475 | bacpy(&(di + n)->dst, &dev->dst); | |
476 | if (++n >= dev_num) | |
477 | break; | |
478 | } | |
479 | ||
393432cd | 480 | spin_unlock(&rfcomm_dev_lock); |
1da177e4 LT |
481 | |
482 | dl->dev_num = n; | |
483 | size = sizeof(*dl) + n * sizeof(*di); | |
484 | ||
485 | err = copy_to_user(arg, dl, size); | |
486 | kfree(dl); | |
487 | ||
488 | return err ? -EFAULT : 0; | |
489 | } | |
490 | ||
491 | static int rfcomm_get_dev_info(void __user *arg) | |
492 | { | |
493 | struct rfcomm_dev *dev; | |
494 | struct rfcomm_dev_info di; | |
495 | int err = 0; | |
496 | ||
497 | BT_DBG(""); | |
498 | ||
499 | if (copy_from_user(&di, arg, sizeof(di))) | |
500 | return -EFAULT; | |
501 | ||
285b4e90 AE |
502 | dev = rfcomm_dev_get(di.id); |
503 | if (!dev) | |
1da177e4 LT |
504 | return -ENODEV; |
505 | ||
506 | di.flags = dev->flags; | |
507 | di.channel = dev->channel; | |
508 | di.state = dev->dlc->state; | |
509 | bacpy(&di.src, &dev->src); | |
510 | bacpy(&di.dst, &dev->dst); | |
511 | ||
512 | if (copy_to_user(arg, &di, sizeof(di))) | |
513 | err = -EFAULT; | |
514 | ||
67054019 | 515 | tty_port_put(&dev->port); |
1da177e4 LT |
516 | return err; |
517 | } | |
518 | ||
519 | int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) | |
520 | { | |
521 | BT_DBG("cmd %d arg %p", cmd, arg); | |
522 | ||
523 | switch (cmd) { | |
524 | case RFCOMMCREATEDEV: | |
525 | return rfcomm_create_dev(sk, arg); | |
526 | ||
527 | case RFCOMMRELEASEDEV: | |
528 | return rfcomm_release_dev(arg); | |
529 | ||
530 | case RFCOMMGETDEVLIST: | |
531 | return rfcomm_get_dev_list(arg); | |
532 | ||
533 | case RFCOMMGETDEVINFO: | |
534 | return rfcomm_get_dev_info(arg); | |
535 | } | |
536 | ||
537 | return -EINVAL; | |
538 | } | |
539 | ||
540 | /* ---- DLC callbacks ---- */ | |
541 | static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb) | |
542 | { | |
543 | struct rfcomm_dev *dev = dlc->owner; | |
544 | struct tty_struct *tty; | |
8e87d142 | 545 | |
a0c22f22 | 546 | if (!dev) { |
1da177e4 LT |
547 | kfree_skb(skb); |
548 | return; | |
549 | } | |
550 | ||
f60db8c4 | 551 | tty = dev->port.tty; |
285b4e90 | 552 | if (!tty || !skb_queue_empty(&dev->pending)) { |
a0c22f22 MH |
553 | skb_queue_tail(&dev->pending, skb); |
554 | return; | |
555 | } | |
556 | ||
1da177e4 LT |
557 | BT_DBG("dlc %p tty %p len %d", dlc, tty, skb->len); |
558 | ||
817d6d3b PF |
559 | tty_insert_flip_string(tty, skb->data, skb->len); |
560 | tty_flip_buffer_push(tty); | |
1da177e4 LT |
561 | |
562 | kfree_skb(skb); | |
563 | } | |
564 | ||
565 | static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err) | |
566 | { | |
567 | struct rfcomm_dev *dev = dlc->owner; | |
568 | if (!dev) | |
569 | return; | |
8e87d142 | 570 | |
1da177e4 LT |
571 | BT_DBG("dlc %p dev %p err %d", dlc, dev, err); |
572 | ||
573 | dev->err = err; | |
574 | wake_up_interruptible(&dev->wait); | |
575 | ||
576 | if (dlc->state == BT_CLOSED) { | |
f60db8c4 | 577 | if (!dev->port.tty) { |
1da177e4 | 578 | if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) { |
537d59af DY |
579 | /* Drop DLC lock here to avoid deadlock |
580 | * 1. rfcomm_dev_get will take rfcomm_dev_lock | |
581 | * but in rfcomm_dev_add there's lock order: | |
582 | * rfcomm_dev_lock -> dlc lock | |
67054019 | 583 | * 2. tty_port_put will deadlock if it's |
537d59af DY |
584 | * the last reference |
585 | */ | |
586 | rfcomm_dlc_unlock(dlc); | |
587 | if (rfcomm_dev_get(dev->id) == NULL) { | |
588 | rfcomm_dlc_lock(dlc); | |
77f2a45f | 589 | return; |
537d59af | 590 | } |
1da177e4 | 591 | |
77f2a45f | 592 | rfcomm_dev_del(dev); |
67054019 | 593 | tty_port_put(&dev->port); |
537d59af | 594 | rfcomm_dlc_lock(dlc); |
1da177e4 | 595 | } |
8e87d142 | 596 | } else |
f60db8c4 | 597 | tty_hangup(dev->port.tty); |
1da177e4 LT |
598 | } |
599 | } | |
600 | ||
601 | static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig) | |
602 | { | |
603 | struct rfcomm_dev *dev = dlc->owner; | |
604 | if (!dev) | |
605 | return; | |