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1/*
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
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
17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18
19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
21 SOFTWARE IS DISCLAIMED.
22*/
23
24/*
25 * RFCOMM TTY.
26 */
27
28#include <linux/module.h>
29
30#include <linux/tty.h>
31#include <linux/tty_driver.h>
32#include <linux/tty_flip.h>
33
34#include <net/bluetooth/bluetooth.h>
35#include <net/bluetooth/hci_core.h>
36#include <net/bluetooth/rfcomm.h>
37
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
43static DEFINE_MUTEX(rfcomm_ioctl_mutex);
44static struct tty_driver *rfcomm_tty_driver;
45
46struct rfcomm_dev {
47 struct tty_port port;
48 struct list_head list;
49
50 char name[12];
51 int id;
52 unsigned long flags;
53 int err;
54
55 unsigned long status; /* don't export to userspace */
56
57 bdaddr_t src;
58 bdaddr_t dst;
59 u8 channel;
60
61 uint modem_status;
62
63 struct rfcomm_dlc *dlc;
64
65 struct device *tty_dev;
66
67 atomic_t wmem_alloc;
68
69 struct sk_buff_head pending;
70};
71
72static LIST_HEAD(rfcomm_dev_list);
73static DEFINE_MUTEX(rfcomm_dev_lock);
74
75static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
76static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
77static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
78
79/* ---- Device functions ---- */
80
81static void rfcomm_dev_destruct(struct tty_port *port)
82{
83 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
84 struct rfcomm_dlc *dlc = dev->dlc;
85
86 BT_DBG("dev %p dlc %p", dev, dlc);
87
88 rfcomm_dlc_lock(dlc);
89 /* Detach DLC if it's owned by this dev */
90 if (dlc->owner == dev)
91 dlc->owner = NULL;
92 rfcomm_dlc_unlock(dlc);
93
94 rfcomm_dlc_put(dlc);
95
96 if (dev->tty_dev)
97 tty_unregister_device(rfcomm_tty_driver, dev->id);
98
99 mutex_lock(&rfcomm_dev_lock);
100 list_del(&dev->list);
101 mutex_unlock(&rfcomm_dev_lock);
102
103 kfree(dev);
104
105 /* It's safe to call module_put() here because socket still
106 holds reference to this module. */
107 module_put(THIS_MODULE);
108}
109
110/* device-specific initialization: open the dlc */
111static int rfcomm_dev_activate(struct tty_port *port, struct tty_struct *tty)
112{
113 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
114 int err;
115
116 err = rfcomm_dlc_open(dev->dlc, &dev->src, &dev->dst, dev->channel);
117 if (err)
118 set_bit(TTY_IO_ERROR, &tty->flags);
119 return err;
120}
121
122/* we block the open until the dlc->state becomes BT_CONNECTED */
123static int rfcomm_dev_carrier_raised(struct tty_port *port)
124{
125 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
126
127 return (dev->dlc->state == BT_CONNECTED);
128}
129
130/* device-specific cleanup: close the dlc */
131static void rfcomm_dev_shutdown(struct tty_port *port)
132{
133 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
134
135 if (dev->tty_dev->parent)
136 device_move(dev->tty_dev, NULL, DPM_ORDER_DEV_LAST);
137
138 /* close the dlc */
139 rfcomm_dlc_close(dev->dlc, 0);
140}
141
142static const struct tty_port_operations rfcomm_port_ops = {
143 .destruct = rfcomm_dev_destruct,
144 .activate = rfcomm_dev_activate,
145 .shutdown = rfcomm_dev_shutdown,
146 .carrier_raised = rfcomm_dev_carrier_raised,
147};
148
149static struct rfcomm_dev *__rfcomm_dev_lookup(int id)
150{
151 struct rfcomm_dev *dev;
152
153 list_for_each_entry(dev, &rfcomm_dev_list, list)
154 if (dev->id == id)
155 return dev;
156
157 return NULL;
158}
159
160static struct rfcomm_dev *rfcomm_dev_get(int id)
161{
162 struct rfcomm_dev *dev;
163
164 mutex_lock(&rfcomm_dev_lock);
165
166 dev = __rfcomm_dev_lookup(id);
167
168 if (dev && !tty_port_get(&dev->port))
169 dev = NULL;
170
171 mutex_unlock(&rfcomm_dev_lock);
172
173 return dev;
174}
175
176static void rfcomm_reparent_device(struct rfcomm_dev *dev)
177{
178 struct hci_dev *hdev;
179 struct hci_conn *conn;
180
181 hdev = hci_get_route(&dev->dst, &dev->src);
182 if (!hdev)
183 return;
184
185 /* The lookup results are unsafe to access without the
186 * hci device lock (FIXME: why is this not documented?)
187 */
188 hci_dev_lock(hdev);
189 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst);
190
191 /* Just because the acl link is in the hash table is no
192 * guarantee the sysfs device has been added ...
193 */
194 if (conn && device_is_registered(&conn->dev))
195 device_move(dev->tty_dev, &conn->dev, DPM_ORDER_DEV_AFTER_PARENT);
196
197 hci_dev_unlock(hdev);
198 hci_dev_put(hdev);
199}
200
201static ssize_t show_address(struct device *tty_dev, struct device_attribute *attr, char *buf)
202{
203 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
204 return sprintf(buf, "%pMR\n", &dev->dst);
205}
206
207static ssize_t show_channel(struct device *tty_dev, struct device_attribute *attr, char *buf)
208{
209 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
210 return sprintf(buf, "%d\n", dev->channel);
211}
212
213static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
214static DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
215
216static struct rfcomm_dev *__rfcomm_dev_add(struct rfcomm_dev_req *req,
217 struct rfcomm_dlc *dlc)
218{
219 struct rfcomm_dev *dev, *entry;
220 struct list_head *head = &rfcomm_dev_list;
221 int err = 0;
222
223 dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
224 if (!dev)
225 return ERR_PTR(-ENOMEM);
226
227 mutex_lock(&rfcomm_dev_lock);
228
229 if (req->dev_id < 0) {
230 dev->id = 0;
231
232 list_for_each_entry(entry, &rfcomm_dev_list, list) {
233 if (entry->id != dev->id)
234 break;
235
236 dev->id++;
237 head = &entry->list;
238 }
239 } else {
240 dev->id = req->dev_id;
241
242 list_for_each_entry(entry, &rfcomm_dev_list, list) {
243 if (entry->id == dev->id) {
244 err = -EADDRINUSE;
245 goto out;
246 }
247
248 if (entry->id > dev->id - 1)
249 break;
250
251 head = &entry->list;
252 }
253 }
254
255 if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
256 err = -ENFILE;
257 goto out;
258 }
259
260 sprintf(dev->name, "rfcomm%d", dev->id);
261
262 list_add(&dev->list, head);
263
264 bacpy(&dev->src, &req->src);
265 bacpy(&dev->dst, &req->dst);
266 dev->channel = req->channel;
267
268 dev->flags = req->flags &
269 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
270
271 tty_port_init(&dev->port);
272 dev->port.ops = &rfcomm_port_ops;
273
274 skb_queue_head_init(&dev->pending);
275
276 rfcomm_dlc_lock(dlc);
277
278 if (req->flags & (1 << RFCOMM_REUSE_DLC)) {
279 struct sock *sk = dlc->owner;
280 struct sk_buff *skb;
281
282 BUG_ON(!sk);
283
284 rfcomm_dlc_throttle(dlc);
285
286 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
287 skb_orphan(skb);
288 skb_queue_tail(&dev->pending, skb);
289 atomic_sub(skb->len, &sk->sk_rmem_alloc);
290 }
291 }
292
293 dlc->data_ready = rfcomm_dev_data_ready;
294 dlc->state_change = rfcomm_dev_state_change;
295 dlc->modem_status = rfcomm_dev_modem_status;
296
297 dlc->owner = dev;
298 dev->dlc = dlc;
299
300 rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig);
301
302 rfcomm_dlc_unlock(dlc);
303
304 /* It's safe to call __module_get() here because socket already
305 holds reference to this module. */
306 __module_get(THIS_MODULE);
307
308 mutex_unlock(&rfcomm_dev_lock);
309 return dev;
310
311out:
312 mutex_unlock(&rfcomm_dev_lock);
313 kfree(dev);
314 return ERR_PTR(err);
315}
316
317static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
318{
319 struct rfcomm_dev *dev;
320 struct device *tty;
321
322 BT_DBG("id %d channel %d", req->dev_id, req->channel);
323
324 dev = __rfcomm_dev_add(req, dlc);
325 if (IS_ERR(dev)) {
326 rfcomm_dlc_put(dlc);
327 return PTR_ERR(dev);
328 }
329
330 tty = tty_port_register_device(&dev->port, rfcomm_tty_driver,
331 dev->id, NULL);
332 if (IS_ERR(tty)) {
333 tty_port_put(&dev->port);
334 return PTR_ERR(tty);
335 }
336
337 dev->tty_dev = tty;
338 rfcomm_reparent_device(dev);
339 dev_set_drvdata(dev->tty_dev, dev);
340
341 if (device_create_file(dev->tty_dev, &dev_attr_address) < 0)
342 BT_ERR("Failed to create address attribute");
343
344 if (device_create_file(dev->tty_dev, &dev_attr_channel) < 0)
345 BT_ERR("Failed to create channel attribute");
346
347 return dev->id;
348}
349
350/* ---- Send buffer ---- */
351static inline unsigned int rfcomm_room(struct rfcomm_dev *dev)
352{
353 struct rfcomm_dlc *dlc = dev->dlc;
354
355 /* Limit the outstanding number of packets not yet sent to 40 */
356 int pending = 40 - atomic_read(&dev->wmem_alloc);
357
358 return max(0, pending) * dlc->mtu;
359}
360
361static void rfcomm_wfree(struct sk_buff *skb)
362{
363 struct rfcomm_dev *dev = (void *) skb->sk;
364 atomic_dec(&dev->wmem_alloc);
365 if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags))
366 tty_port_tty_wakeup(&dev->port);
367 tty_port_put(&dev->port);
368}
369
370static void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
371{
372 tty_port_get(&dev->port);
373 atomic_inc(&dev->wmem_alloc);
374 skb->sk = (void *) dev;
375 skb->destructor = rfcomm_wfree;
376}
377
378static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority)
379{
380 struct sk_buff *skb = alloc_skb(size, priority);
381 if (skb)
382 rfcomm_set_owner_w(skb, dev);
383 return skb;
384}
385
386/* ---- Device IOCTLs ---- */
387
388#define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
389
390static int __rfcomm_create_dev(struct sock *sk, void __user *arg)
391{
392 struct rfcomm_dev_req req;
393 struct rfcomm_dlc *dlc;
394 int id;
395
396 if (copy_from_user(&req, arg, sizeof(req)))
397 return -EFAULT;
398
399 BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags);
400
401 if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
402 return -EPERM;
403
404 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
405 /* Socket must be connected */
406 if (sk->sk_state != BT_CONNECTED)
407 return -EBADFD;
408
409 dlc = rfcomm_pi(sk)->dlc;
410 rfcomm_dlc_hold(dlc);
411 } else {
412 /* Validate the channel is unused */
413 dlc = rfcomm_dlc_exists(&req.src, &req.dst, req.channel);
414 if (IS_ERR(dlc))
415 return PTR_ERR(dlc);
416 else if (dlc) {
417 rfcomm_dlc_put(dlc);
418 return -EBUSY;
419 }
420 dlc = rfcomm_dlc_alloc(GFP_KERNEL);
421 if (!dlc)
422 return -ENOMEM;
423 }
424
425 id = rfcomm_dev_add(&req, dlc);
426 if (id < 0)
427 return id;
428
429 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
430 /* DLC is now used by device.
431 * Socket must be disconnected */
432 sk->sk_state = BT_CLOSED;
433 }
434
435 return id;
436}
437
438static int __rfcomm_release_dev(void __user *arg)
439{
440 struct rfcomm_dev_req req;
441 struct rfcomm_dev *dev;
442 struct tty_struct *tty;
443
444 if (copy_from_user(&req, arg, sizeof(req)))
445 return -EFAULT;
446
447 BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags);
448
449 dev = rfcomm_dev_get(req.dev_id);
450 if (!dev)
451 return -ENODEV;
452
453 if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
454 tty_port_put(&dev->port);
455 return -EPERM;
456 }
457
458 /* only release once */
459 if (test_and_set_bit(RFCOMM_DEV_RELEASED, &dev->status)) {
460 tty_port_put(&dev->port);
461 return -EALREADY;
462 }
463
464 if (req.flags & (1 << RFCOMM_HANGUP_NOW))
465 rfcomm_dlc_close(dev->dlc, 0);
466
467 /* Shut down TTY synchronously before freeing rfcomm_dev */
468 tty = tty_port_tty_get(&dev->port);
469 if (tty) {
470 tty_vhangup(tty);
471 tty_kref_put(tty);
472 }
473
474 if (!test_bit(RFCOMM_TTY_OWNED, &dev->status))
475 tty_port_put(&dev->port);
476
477 tty_port_put(&dev->port);
478 return 0;
479}
480
481static int rfcomm_create_dev(struct sock *sk, void __user *arg)
482{
483 int ret;
484
485 mutex_lock(&rfcomm_ioctl_mutex);
486 ret = __rfcomm_create_dev(sk, arg);
487 mutex_unlock(&rfcomm_ioctl_mutex);
488
489 return ret;
490}
491
492static int rfcomm_release_dev(void __user *arg)
493{
494 int ret;
495
496 mutex_lock(&rfcomm_ioctl_mutex);
497 ret = __rfcomm_release_dev(arg);
498 mutex_unlock(&rfcomm_ioctl_mutex);
499
500 return ret;
501}
502
503static int rfcomm_get_dev_list(void __user *arg)
504{
505 struct rfcomm_dev *dev;
506 struct rfcomm_dev_list_req *dl;
507 struct rfcomm_dev_info *di;
508 int n = 0, size, err;
509 u16 dev_num;
510
511 BT_DBG("");
512
513 if (get_user(dev_num, (u16 __user *) arg))
514 return -EFAULT;
515
516 if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
517 return -EINVAL;
518
519 size = sizeof(*dl) + dev_num * sizeof(*di);
520
521 dl = kzalloc(size, GFP_KERNEL);
522 if (!dl)
523 return -ENOMEM;
524
525 di = dl->dev_info;
526
527 mutex_lock(&rfcomm_dev_lock);
528
529 list_for_each_entry(dev, &rfcomm_dev_list, list) {
530 if (!tty_port_get(&dev->port))
531 continue;
532 (di + n)->id = dev->id;
533 (di + n)->flags = dev->flags;
534 (di + n)->state = dev->dlc->state;
535 (di + n)->channel = dev->channel;
536 bacpy(&(di + n)->src, &dev->src);
537 bacpy(&(di + n)->dst, &dev->dst);
538 tty_port_put(&dev->port);
539 if (++n >= dev_num)
540 break;
541 }
542
543 mutex_unlock(&rfcomm_dev_lock);
544
545 dl->dev_num = n;
546 size = sizeof(*dl) + n * sizeof(*di);
547
548 err = copy_to_user(arg, dl, size);
549 kfree(dl);
550
551 return err ? -EFAULT : 0;
552}
553
554static int rfcomm_get_dev_info(void __user *arg)
555{
556 struct rfcomm_dev *dev;
557 struct rfcomm_dev_info di;
558 int err = 0;
559
560 BT_DBG("");
561
562 if (copy_from_user(&di, arg, sizeof(di)))
563 return -EFAULT;
564
565 dev = rfcomm_dev_get(di.id);
566 if (!dev)
567 return -ENODEV;
568
569 di.flags = dev->flags;
570 di.channel = dev->channel;
571 di.state = dev->dlc->state;
572 bacpy(&di.src, &dev->src);
573 bacpy(&di.dst, &dev->dst);
574
575 if (copy_to_user(arg, &di, sizeof(di)))
576 err = -EFAULT;
577
578 tty_port_put(&dev->port);
579 return err;
580}
581
582int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
583{
584 BT_DBG("cmd %d arg %p", cmd, arg);
585
586 switch (cmd) {
587 case RFCOMMCREATEDEV:
588 return rfcomm_create_dev(sk, arg);
589
590 case RFCOMMRELEASEDEV:
591 return rfcomm_release_dev(arg);
592
593 case RFCOMMGETDEVLIST:
594 return rfcomm_get_dev_list(arg);
595
596 case RFCOMMGETDEVINFO:
597 return rfcomm_get_dev_info(arg);
598 }
599
600 return -EINVAL;
601}
602
603/* ---- DLC callbacks ---- */
604static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
605{
606 struct rfcomm_dev *dev = dlc->owner;
607
608 if (!dev) {
609 kfree_skb(skb);
610 return;
611 }
612
613 if (!skb_queue_empty(&dev->pending)) {
614 skb_queue_tail(&dev->pending, skb);
615 return;
616 }
617
618 BT_DBG("dlc %p len %d", dlc, skb->len);
619
620 tty_insert_flip_string(&dev->port, skb->data, skb->len);
621 tty_flip_buffer_push(&dev->port);
622
623 kfree_skb(skb);
624}
625
626static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
627{
628 struct rfcomm_dev *dev = dlc->owner;
629 if (!dev)
630 return;
631
632 BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
633
634 dev->err = err;
635 if (dlc->state == BT_CONNECTED) {
636 rfcomm_reparent_device(dev);
637
638 wake_up_interruptible(&dev->port.open_wait);
639 } else if (dlc->state == BT_CLOSED)
640 tty_port_tty_hangup(&dev->port, false);
641}
642
643static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
644{
645 struct rfcomm_dev *dev = dlc->owner;
646 if (!dev)
647 return;
648
649 BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
650
651 if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV))
652 tty_port_tty_hangup(&dev->port, true);
653
654 dev->modem_status =
655 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
656 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
657 ((v24_sig & RFCOMM_V24_IC) ? TIOCM_RI : 0) |
658 ((v24_sig & RFCOMM_V24_DV) ? TIOCM_CD : 0);
659}
660
661/* ---- TTY functions ---- */
662static void rfcomm_tty_copy_pending(struct rfcomm_dev *dev)
663{
664 struct sk_buff *skb;
665 int inserted = 0;
666
667 BT_DBG("dev %p", dev);
668
669 rfcomm_dlc_lock(dev->dlc);
670
671 while ((skb = skb_dequeue(&dev->pending))) {
672 inserted += tty_insert_flip_string(&dev->port, skb->data,
673 skb->len);
674 kfree_skb(skb);
675 }
676
677 rfcomm_dlc_unlock(dev->dlc);
678
679 if (inserted > 0)
680 tty_flip_buffer_push(&dev->port);
681}
682
683/* do the reverse of install, clearing the tty fields and releasing the
684 * reference to tty_port
685 */
686static void rfcomm_tty_cleanup(struct tty_struct *tty)
687{
688 struct rfcomm_dev *dev = tty->driver_data;
689
690 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
691
692 rfcomm_dlc_lock(dev->dlc);
693 tty->driver_data = NULL;
694 rfcomm_dlc_unlock(dev->dlc);
695
696 /*
697 * purge the dlc->tx_queue to avoid circular dependencies
698 * between dev and dlc
699 */
700 skb_queue_purge(&dev->dlc->tx_queue);
701
702 tty_port_put(&dev->port);
703}
704
705/* we acquire the tty_port reference since it's here the tty is first used
706 * by setting the termios. We also populate the driver_data field and install
707 * the tty port
708 */
709static int rfcomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
710{
711 struct rfcomm_dev *dev;
712 struct rfcomm_dlc *dlc;
713 int err;
714
715 dev = rfcomm_dev_get(tty->index);
716 if (!dev)
717 return -ENODEV;
718
719 dlc = dev->dlc;
720
721 /* Attach TTY and open DLC */
722 rfcomm_dlc_lock(dlc);
723 tty->driver_data = dev;
724 rfcomm_dlc_unlock(dlc);
725 set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
726
727 /* install the tty_port */
728 err = tty_port_install(&dev->port, driver, tty);
729 if (err) {
730 rfcomm_tty_cleanup(tty);
731 return err;
732 }
733
734 /* take over the tty_port reference if the port was created with the
735 * flag RFCOMM_RELEASE_ONHUP. This will force the release of the port
736 * when the last process closes the tty. The behaviour is expected by
737 * userspace.
738 */
739 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
740 set_bit(RFCOMM_TTY_OWNED, &dev->status);
741 tty_port_put(&dev->port);
742 }
743
744 return 0;
745}
746
747static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
748{
749 struct rfcomm_dev *dev = tty->driver_data;
750 int err;
751
752 BT_DBG("tty %p id %d", tty, tty->index);
753
754 BT_DBG("dev %p dst %pMR channel %d opened %d", dev, &dev->dst,
755 dev->channel, dev->port.count);
756
757 err = tty_port_open(&dev->port, tty, filp);
758 if (err)
759 return err;
760
761 /*
762 * FIXME: rfcomm should use proper flow control for
763 * received data. This hack will be unnecessary and can
764 * be removed when that's implemented
765 */
766 rfcomm_tty_copy_pending(dev);
767
768 rfcomm_dlc_unthrottle(dev->dlc);
769
770 return 0;
771}
772
773static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
774{
775 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
776
777 BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc,
778 dev->port.count);
779
780 tty_port_close(&dev->port, tty, filp);
781}
782
783static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
784{
785 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
786 struct rfcomm_dlc *dlc = dev->dlc;
787 struct sk_buff *skb;
788 int sent = 0, size;
789
790 BT_DBG("tty %p count %d", tty, count);
791
792 while (count) {
793 size = min_t(uint, count, dlc->mtu);
794
795 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
796 if (!skb)
797 break;
798
799 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
800
801 memcpy(skb_put(skb, size), buf + sent, size);
802
803 rfcomm_dlc_send_noerror(dlc, skb);
804
805 sent += size;
806 count -= size;
807 }
808
809 return sent;
810}
811
812static int rfcomm_tty_write_room(struct tty_struct *tty)
813{
814 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
815 int room = 0;
816
817 if (dev && dev->dlc)
818 room = rfcomm_room(dev);
819
820 BT_DBG("tty %p room %d", tty, room);
821
822 return room;
823}
824
825static int rfcomm_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
826{
827 BT_DBG("tty %p cmd 0x%02x", tty, cmd);
828
829 switch (cmd) {
830 case TCGETS:
831 BT_DBG("TCGETS is not supported");
832 return -ENOIOCTLCMD;
833
834 case TCSETS:
835 BT_DBG("TCSETS is not supported");
836 return -ENOIOCTLCMD;
837
838 case TIOCMIWAIT:
839 BT_DBG("TIOCMIWAIT");
840 break;
841
842 case TIOCGSERIAL:
843 BT_ERR("TIOCGSERIAL is not supported");
844 return -ENOIOCTLCMD;
845
846 case TIOCSSERIAL:
847 BT_ERR("TIOCSSERIAL is not supported");
848 return -ENOIOCTLCMD;
849
850 case TIOCSERGSTRUCT:
851 BT_ERR("TIOCSERGSTRUCT is not supported");
852 return -ENOIOCTLCMD;
853
854 case TIOCSERGETLSR:
855 BT_ERR("TIOCSERGETLSR is not supported");
856 return -ENOIOCTLCMD;
857
858 case TIOCSERCONFIG:
859 BT_ERR("TIOCSERCONFIG is not supported");
860 return -ENOIOCTLCMD;
861
862 default:
863 return -ENOIOCTLCMD; /* ioctls which we must ignore */
864
865 }
866
867 return -ENOIOCTLCMD;
868}
869
870static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
871{
872 struct ktermios *new = &tty->termios;
873 int old_baud_rate = tty_termios_baud_rate(old);
874 int new_baud_rate = tty_termios_baud_rate(new);
875
876 u8 baud, data_bits, stop_bits, parity, x_on, x_off;
877 u16 changes = 0;
878
879 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
880
881 BT_DBG("tty %p termios %p", tty, old);
882
883 if (!dev || !dev->dlc || !dev->dlc->session)
884 return;
885
886 /* Handle turning off CRTSCTS */
887 if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
888 BT_DBG("Turning off CRTSCTS unsupported");
889
890 /* Parity on/off and when on, odd/even */
891 if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
892 ((old->c_cflag & PARODD) != (new->c_cflag & PARODD))) {
893 changes |= RFCOMM_RPN_PM_PARITY;
894 BT_DBG("Parity change detected.");
895 }
896
897 /* Mark and space parity are not supported! */
898 if (new->c_cflag & PARENB) {
899 if (new->c_cflag & PARODD) {
900 BT_DBG("Parity is ODD");
901 parity = RFCOMM_RPN_PARITY_ODD;
902 } else {
903 BT_DBG("Parity is EVEN");
904 parity = RFCOMM_RPN_PARITY_EVEN;
905 }
906 } else {
907 BT_DBG("Parity is OFF");
908 parity = RFCOMM_RPN_PARITY_NONE;
909 }
910
911 /* Setting the x_on / x_off characters */
912 if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
913 BT_DBG("XOFF custom");
914 x_on = new->c_cc[VSTOP];
915 changes |= RFCOMM_RPN_PM_XON;
916 } else {
917 BT_DBG("XOFF default");
918 x_on = RFCOMM_RPN_XON_CHAR;
919 }
920
921 if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
922 BT_DBG("XON custom");
923 x_off = new->c_cc[VSTART];
924 changes |= RFCOMM_RPN_PM_XOFF;
925 } else {
926 BT_DBG("XON default");
927 x_off = RFCOMM_RPN_XOFF_CHAR;
928 }
929
930 /* Handle setting of stop bits */
931 if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
932 changes |= RFCOMM_RPN_PM_STOP;
933
934 /* POSIX does not support 1.5 stop bits and RFCOMM does not
935 * support 2 stop bits. So a request for 2 stop bits gets
936 * translated to 1.5 stop bits */
937 if (new->c_cflag & CSTOPB)
938 stop_bits = RFCOMM_RPN_STOP_15;
939 else
940 stop_bits = RFCOMM_RPN_STOP_1;
941
942 /* Handle number of data bits [5-8] */
943 if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
944 changes |= RFCOMM_RPN_PM_DATA;
945
946 switch (new->c_cflag & CSIZE) {
947 case CS5:
948 data_bits = RFCOMM_RPN_DATA_5;
949 break;
950 case CS6:
951 data_bits = RFCOMM_RPN_DATA_6;
952 break;
953 case CS7:
954 data_bits = RFCOMM_RPN_DATA_7;
955 break;
956 case CS8:
957 data_bits = RFCOMM_RPN_DATA_8;
958 break;
959 default:
960 data_bits = RFCOMM_RPN_DATA_8;
961 break;
962 }
963
964 /* Handle baudrate settings */
965 if (old_baud_rate != new_baud_rate)
966 changes |= RFCOMM_RPN_PM_BITRATE;
967
968 switch (new_baud_rate) {
969 case 2400:
970 baud = RFCOMM_RPN_BR_2400;
971 break;
972 case 4800:
973 baud = RFCOMM_RPN_BR_4800;
974 break;
975 case 7200:
976 baud = RFCOMM_RPN_BR_7200;
977 break;
978 case 9600:
979 baud = RFCOMM_RPN_BR_9600;
980 break;
981 case 19200:
982 baud = RFCOMM_RPN_BR_19200;
983 break;
984 case 38400:
985 baud = RFCOMM_RPN_BR_38400;
986 break;
987 case 57600:
988 baud = RFCOMM_RPN_BR_57600;
989 break;
990 case 115200:
991 baud = RFCOMM_RPN_BR_115200;
992 break;
993 case 230400:
994 baud = RFCOMM_RPN_BR_230400;
995 break;
996 default:
997 /* 9600 is standard accordinag to the RFCOMM specification */
998 baud = RFCOMM_RPN_BR_9600;
999 break;
1000
1001 }
1002
1003 if (changes)
1004 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
1005 data_bits, stop_bits, parity,
1006 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
1007}
1008
1009static void rfcomm_tty_throttle(struct tty_struct *tty)
1010{
1011 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1012
1013 BT_DBG("tty %p dev %p", tty, dev);
1014
1015 rfcomm_dlc_throttle(dev->dlc);
1016}
1017
1018static void rfcomm_tty_unthrottle(struct tty_struct *tty)
1019{
1020 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1021
1022 BT_DBG("tty %p dev %p", tty, dev);
1023
1024 rfcomm_dlc_unthrottle(dev->dlc);
1025}
1026
1027static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
1028{
1029 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1030
1031 BT_DBG("tty %p dev %p", tty, dev);
1032
1033 if (!dev || !dev->dlc)
1034 return 0;
1035
1036 if (!skb_queue_empty(&dev->dlc->tx_queue))
1037 return dev->dlc->mtu;
1038
1039 return 0;
1040}
1041
1042static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
1043{
1044 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1045
1046 BT_DBG("tty %p dev %p", tty, dev);
1047
1048 if (!dev || !dev->dlc)
1049 return;
1050
1051 skb_queue_purge(&dev->dlc->tx_queue);
1052 tty_wakeup(tty);
1053}
1054
1055static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
1056{
1057 BT_DBG("tty %p ch %c", tty, ch);
1058}
1059
1060static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
1061{
1062 BT_DBG("tty %p timeout %d", tty, timeout);
1063}
1064
1065static void rfcomm_tty_hangup(struct tty_struct *tty)
1066{
1067 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1068
1069 BT_DBG("tty %p dev %p", tty, dev);
1070
1071 tty_port_hangup(&dev->port);
1072}
1073
1074static int rfcomm_tty_tiocmget(struct tty_struct *tty)
1075{
1076 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1077
1078 BT_DBG("tty %p dev %p", tty, dev);
1079
1080 return dev->modem_status;
1081}
1082
1083static int rfcomm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
1084{
1085 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1086 struct rfcomm_dlc *dlc = dev->dlc;
1087 u8 v24_sig;
1088
1089 BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
1090
1091 rfcomm_dlc_get_modem_status(dlc, &v24_sig);
1092
1093 if (set & TIOCM_DSR || set & TIOCM_DTR)
1094 v24_sig |= RFCOMM_V24_RTC;
1095 if (set & TIOCM_RTS || set & TIOCM_CTS)
1096 v24_sig |= RFCOMM_V24_RTR;
1097 if (set & TIOCM_RI)
1098 v24_sig |= RFCOMM_V24_IC;
1099 if (set & TIOCM_CD)
1100 v24_sig |= RFCOMM_V24_DV;
1101
1102 if (clear & TIOCM_DSR || clear & TIOCM_DTR)
1103 v24_sig &= ~RFCOMM_V24_RTC;
1104 if (clear & TIOCM_RTS || clear & TIOCM_CTS)
1105 v24_sig &= ~RFCOMM_V24_RTR;
1106 if (clear & TIOCM_RI)
1107 v24_sig &= ~RFCOMM_V24_IC;
1108 if (clear & TIOCM_CD)
1109 v24_sig &= ~RFCOMM_V24_DV;
1110
1111 rfcomm_dlc_set_modem_status(dlc, v24_sig);
1112
1113 return 0;
1114}
1115
1116/* ---- TTY structure ---- */
1117
1118static const struct tty_operations rfcomm_ops = {
1119 .open = rfcomm_tty_open,
1120 .close = rfcomm_tty_close,
1121 .write = rfcomm_tty_write,
1122 .write_room = rfcomm_tty_write_room,
1123 .chars_in_buffer = rfcomm_tty_chars_in_buffer,
1124 .flush_buffer = rfcomm_tty_flush_buffer,
1125 .ioctl = rfcomm_tty_ioctl,
1126 .throttle = rfcomm_tty_throttle,
1127 .unthrottle = rfcomm_tty_unthrottle,
1128 .set_termios = rfcomm_tty_set_termios,
1129 .send_xchar = rfcomm_tty_send_xchar,
1130 .hangup = rfcomm_tty_hangup,
1131 .wait_until_sent = rfcomm_tty_wait_until_sent,
1132 .tiocmget = rfcomm_tty_tiocmget,
1133 .tiocmset = rfcomm_tty_tiocmset,
1134 .install = rfcomm_tty_install,
1135 .cleanup = rfcomm_tty_cleanup,
1136};
1137
1138int __init rfcomm_init_ttys(void)
1139{
1140 int error;
1141
1142 rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
1143 if (!rfcomm_tty_driver)
1144 return -ENOMEM;
1145
1146 rfcomm_tty_driver->driver_name = "rfcomm";
1147 rfcomm_tty_driver->name = "rfcomm";
1148 rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR;
1149 rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR;
1150 rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1151 rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1152 rfcomm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1153 rfcomm_tty_driver->init_termios = tty_std_termios;
1154 rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
1155 rfcomm_tty_driver->init_termios.c_lflag &= ~ICANON;
1156 tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1157
1158 error = tty_register_driver(rfcomm_tty_driver);
1159 if (error) {
1160 BT_ERR("Can't register RFCOMM TTY driver");
1161 put_tty_driver(rfcomm_tty_driver);
1162 return error;
1163 }
1164
1165 BT_INFO("RFCOMM TTY layer initialized");
1166
1167 return 0;
1168}
1169
1170void rfcomm_cleanup_ttys(void)
1171{
1172 tty_unregister_driver(rfcomm_tty_driver);
1173 put_tty_driver(rfcomm_tty_driver);
1174}
1/*
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
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
17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18
19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
21 SOFTWARE IS DISCLAIMED.
22*/
23
24/*
25 * RFCOMM TTY.
26 */
27
28#include <linux/module.h>
29
30#include <linux/tty.h>
31#include <linux/tty_driver.h>
32#include <linux/tty_flip.h>
33
34#include <net/bluetooth/bluetooth.h>
35#include <net/bluetooth/hci_core.h>
36#include <net/bluetooth/rfcomm.h>
37
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
43static DEFINE_MUTEX(rfcomm_ioctl_mutex);
44static struct tty_driver *rfcomm_tty_driver;
45
46struct rfcomm_dev {
47 struct tty_port port;
48 struct list_head list;
49
50 char name[12];
51 int id;
52 unsigned long flags;
53 int err;
54
55 unsigned long status; /* don't export to userspace */
56
57 bdaddr_t src;
58 bdaddr_t dst;
59 u8 channel;
60
61 uint modem_status;
62
63 struct rfcomm_dlc *dlc;
64
65 struct device *tty_dev;
66
67 atomic_t wmem_alloc;
68
69 struct sk_buff_head pending;
70};
71
72static LIST_HEAD(rfcomm_dev_list);
73static DEFINE_MUTEX(rfcomm_dev_lock);
74
75static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
76static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
77static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
78
79/* ---- Device functions ---- */
80
81static void rfcomm_dev_destruct(struct tty_port *port)
82{
83 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
84 struct rfcomm_dlc *dlc = dev->dlc;
85
86 BT_DBG("dev %p dlc %p", dev, dlc);
87
88 rfcomm_dlc_lock(dlc);
89 /* Detach DLC if it's owned by this dev */
90 if (dlc->owner == dev)
91 dlc->owner = NULL;
92 rfcomm_dlc_unlock(dlc);
93
94 rfcomm_dlc_put(dlc);
95
96 if (dev->tty_dev)
97 tty_unregister_device(rfcomm_tty_driver, dev->id);
98
99 mutex_lock(&rfcomm_dev_lock);
100 list_del(&dev->list);
101 mutex_unlock(&rfcomm_dev_lock);
102
103 kfree(dev);
104
105 /* It's safe to call module_put() here because socket still
106 holds reference to this module. */
107 module_put(THIS_MODULE);
108}
109
110/* device-specific initialization: open the dlc */
111static int rfcomm_dev_activate(struct tty_port *port, struct tty_struct *tty)
112{
113 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
114 int err;
115
116 err = rfcomm_dlc_open(dev->dlc, &dev->src, &dev->dst, dev->channel);
117 if (err)
118 set_bit(TTY_IO_ERROR, &tty->flags);
119 return err;
120}
121
122/* we block the open until the dlc->state becomes BT_CONNECTED */
123static int rfcomm_dev_carrier_raised(struct tty_port *port)
124{
125 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
126
127 return (dev->dlc->state == BT_CONNECTED);
128}
129
130/* device-specific cleanup: close the dlc */
131static void rfcomm_dev_shutdown(struct tty_port *port)
132{
133 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
134
135 if (dev->tty_dev->parent)
136 device_move(dev->tty_dev, NULL, DPM_ORDER_DEV_LAST);
137
138 /* close the dlc */
139 rfcomm_dlc_close(dev->dlc, 0);
140}
141
142static const struct tty_port_operations rfcomm_port_ops = {
143 .destruct = rfcomm_dev_destruct,
144 .activate = rfcomm_dev_activate,
145 .shutdown = rfcomm_dev_shutdown,
146 .carrier_raised = rfcomm_dev_carrier_raised,
147};
148
149static struct rfcomm_dev *__rfcomm_dev_lookup(int id)
150{
151 struct rfcomm_dev *dev;
152
153 list_for_each_entry(dev, &rfcomm_dev_list, list)
154 if (dev->id == id)
155 return dev;
156
157 return NULL;
158}
159
160static struct rfcomm_dev *rfcomm_dev_get(int id)
161{
162 struct rfcomm_dev *dev;
163
164 mutex_lock(&rfcomm_dev_lock);
165
166 dev = __rfcomm_dev_lookup(id);
167
168 if (dev && !tty_port_get(&dev->port))
169 dev = NULL;
170
171 mutex_unlock(&rfcomm_dev_lock);
172
173 return dev;
174}
175
176static void rfcomm_reparent_device(struct rfcomm_dev *dev)
177{
178 struct hci_dev *hdev;
179 struct hci_conn *conn;
180
181 hdev = hci_get_route(&dev->dst, &dev->src, BDADDR_BREDR);
182 if (!hdev)
183 return;
184
185 /* The lookup results are unsafe to access without the
186 * hci device lock (FIXME: why is this not documented?)
187 */
188 hci_dev_lock(hdev);
189 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst);
190
191 /* Just because the acl link is in the hash table is no
192 * guarantee the sysfs device has been added ...
193 */
194 if (conn && device_is_registered(&conn->dev))
195 device_move(dev->tty_dev, &conn->dev, DPM_ORDER_DEV_AFTER_PARENT);
196
197 hci_dev_unlock(hdev);
198 hci_dev_put(hdev);
199}
200
201static ssize_t show_address(struct device *tty_dev, struct device_attribute *attr, char *buf)
202{
203 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
204 return sprintf(buf, "%pMR\n", &dev->dst);
205}
206
207static ssize_t show_channel(struct device *tty_dev, struct device_attribute *attr, char *buf)
208{
209 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
210 return sprintf(buf, "%d\n", dev->channel);
211}
212
213static DEVICE_ATTR(address, 0444, show_address, NULL);
214static DEVICE_ATTR(channel, 0444, show_channel, NULL);
215
216static struct rfcomm_dev *__rfcomm_dev_add(struct rfcomm_dev_req *req,
217 struct rfcomm_dlc *dlc)
218{
219 struct rfcomm_dev *dev, *entry;
220 struct list_head *head = &rfcomm_dev_list;
221 int err = 0;
222
223 dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
224 if (!dev)
225 return ERR_PTR(-ENOMEM);
226
227 mutex_lock(&rfcomm_dev_lock);
228
229 if (req->dev_id < 0) {
230 dev->id = 0;
231
232 list_for_each_entry(entry, &rfcomm_dev_list, list) {
233 if (entry->id != dev->id)
234 break;
235
236 dev->id++;
237 head = &entry->list;
238 }
239 } else {
240 dev->id = req->dev_id;
241
242 list_for_each_entry(entry, &rfcomm_dev_list, list) {
243 if (entry->id == dev->id) {
244 err = -EADDRINUSE;
245 goto out;
246 }
247
248 if (entry->id > dev->id - 1)
249 break;
250
251 head = &entry->list;
252 }
253 }
254
255 if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
256 err = -ENFILE;
257 goto out;
258 }
259
260 sprintf(dev->name, "rfcomm%d", dev->id);
261
262 list_add(&dev->list, head);
263
264 bacpy(&dev->src, &req->src);
265 bacpy(&dev->dst, &req->dst);
266 dev->channel = req->channel;
267
268 dev->flags = req->flags &
269 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
270
271 tty_port_init(&dev->port);
272 dev->port.ops = &rfcomm_port_ops;
273
274 skb_queue_head_init(&dev->pending);
275
276 rfcomm_dlc_lock(dlc);
277
278 if (req->flags & (1 << RFCOMM_REUSE_DLC)) {
279 struct sock *sk = dlc->owner;
280 struct sk_buff *skb;
281
282 BUG_ON(!sk);
283
284 rfcomm_dlc_throttle(dlc);
285
286 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
287 skb_orphan(skb);
288 skb_queue_tail(&dev->pending, skb);
289 atomic_sub(skb->len, &sk->sk_rmem_alloc);
290 }
291 }
292
293 dlc->data_ready = rfcomm_dev_data_ready;
294 dlc->state_change = rfcomm_dev_state_change;
295 dlc->modem_status = rfcomm_dev_modem_status;
296
297 dlc->owner = dev;
298 dev->dlc = dlc;
299
300 rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig);
301
302 rfcomm_dlc_unlock(dlc);
303
304 /* It's safe to call __module_get() here because socket already
305 holds reference to this module. */
306 __module_get(THIS_MODULE);
307
308 mutex_unlock(&rfcomm_dev_lock);
309 return dev;
310
311out:
312 mutex_unlock(&rfcomm_dev_lock);
313 kfree(dev);
314 return ERR_PTR(err);
315}
316
317static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
318{
319 struct rfcomm_dev *dev;
320 struct device *tty;
321
322 BT_DBG("id %d channel %d", req->dev_id, req->channel);
323
324 dev = __rfcomm_dev_add(req, dlc);
325 if (IS_ERR(dev)) {
326 rfcomm_dlc_put(dlc);
327 return PTR_ERR(dev);
328 }
329
330 tty = tty_port_register_device(&dev->port, rfcomm_tty_driver,
331 dev->id, NULL);
332 if (IS_ERR(tty)) {
333 tty_port_put(&dev->port);
334 return PTR_ERR(tty);
335 }
336
337 dev->tty_dev = tty;
338 rfcomm_reparent_device(dev);
339 dev_set_drvdata(dev->tty_dev, dev);
340
341 if (device_create_file(dev->tty_dev, &dev_attr_address) < 0)
342 BT_ERR("Failed to create address attribute");
343
344 if (device_create_file(dev->tty_dev, &dev_attr_channel) < 0)
345 BT_ERR("Failed to create channel attribute");
346
347 return dev->id;
348}
349
350/* ---- Send buffer ---- */
351static inline unsigned int rfcomm_room(struct rfcomm_dev *dev)
352{
353 struct rfcomm_dlc *dlc = dev->dlc;
354
355 /* Limit the outstanding number of packets not yet sent to 40 */
356 int pending = 40 - atomic_read(&dev->wmem_alloc);
357
358 return max(0, pending) * dlc->mtu;
359}
360
361static void rfcomm_wfree(struct sk_buff *skb)
362{
363 struct rfcomm_dev *dev = (void *) skb->sk;
364 atomic_dec(&dev->wmem_alloc);
365 if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags))
366 tty_port_tty_wakeup(&dev->port);
367 tty_port_put(&dev->port);
368}
369
370static void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
371{
372 tty_port_get(&dev->port);
373 atomic_inc(&dev->wmem_alloc);
374 skb->sk = (void *) dev;
375 skb->destructor = rfcomm_wfree;
376}
377
378static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority)
379{
380 struct sk_buff *skb = alloc_skb(size, priority);
381 if (skb)
382 rfcomm_set_owner_w(skb, dev);
383 return skb;
384}
385
386/* ---- Device IOCTLs ---- */
387
388#define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
389
390static int __rfcomm_create_dev(struct sock *sk, void __user *arg)
391{
392 struct rfcomm_dev_req req;
393 struct rfcomm_dlc *dlc;
394 int id;
395
396 if (copy_from_user(&req, arg, sizeof(req)))
397 return -EFAULT;
398
399 BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags);
400
401 if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
402 return -EPERM;
403
404 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
405 /* Socket must be connected */
406 if (sk->sk_state != BT_CONNECTED)
407 return -EBADFD;
408
409 dlc = rfcomm_pi(sk)->dlc;
410 rfcomm_dlc_hold(dlc);
411 } else {
412 /* Validate the channel is unused */
413 dlc = rfcomm_dlc_exists(&req.src, &req.dst, req.channel);
414 if (IS_ERR(dlc))
415 return PTR_ERR(dlc);
416 if (dlc)
417 return -EBUSY;
418 dlc = rfcomm_dlc_alloc(GFP_KERNEL);
419 if (!dlc)
420 return -ENOMEM;
421 }
422
423 id = rfcomm_dev_add(&req, dlc);
424 if (id < 0)
425 return id;
426
427 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
428 /* DLC is now used by device.
429 * Socket must be disconnected */
430 sk->sk_state = BT_CLOSED;
431 }
432
433 return id;
434}
435
436static int __rfcomm_release_dev(void __user *arg)
437{
438 struct rfcomm_dev_req req;
439 struct rfcomm_dev *dev;
440 struct tty_struct *tty;
441
442 if (copy_from_user(&req, arg, sizeof(req)))
443 return -EFAULT;
444
445 BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags);
446
447 dev = rfcomm_dev_get(req.dev_id);
448 if (!dev)
449 return -ENODEV;
450
451 if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
452 tty_port_put(&dev->port);
453 return -EPERM;
454 }
455
456 /* only release once */
457 if (test_and_set_bit(RFCOMM_DEV_RELEASED, &dev->status)) {
458 tty_port_put(&dev->port);
459 return -EALREADY;
460 }
461
462 if (req.flags & (1 << RFCOMM_HANGUP_NOW))
463 rfcomm_dlc_close(dev->dlc, 0);
464
465 /* Shut down TTY synchronously before freeing rfcomm_dev */
466 tty = tty_port_tty_get(&dev->port);
467 if (tty) {
468 tty_vhangup(tty);
469 tty_kref_put(tty);
470 }
471
472 if (!test_bit(RFCOMM_TTY_OWNED, &dev->status))
473 tty_port_put(&dev->port);
474
475 tty_port_put(&dev->port);
476 return 0;
477}
478
479static int rfcomm_create_dev(struct sock *sk, void __user *arg)
480{
481 int ret;
482
483 mutex_lock(&rfcomm_ioctl_mutex);
484 ret = __rfcomm_create_dev(sk, arg);
485 mutex_unlock(&rfcomm_ioctl_mutex);
486
487 return ret;
488}
489
490static int rfcomm_release_dev(void __user *arg)
491{
492 int ret;
493
494 mutex_lock(&rfcomm_ioctl_mutex);
495 ret = __rfcomm_release_dev(arg);
496 mutex_unlock(&rfcomm_ioctl_mutex);
497
498 return ret;
499}
500
501static int rfcomm_get_dev_list(void __user *arg)
502{
503 struct rfcomm_dev *dev;
504 struct rfcomm_dev_list_req *dl;
505 struct rfcomm_dev_info *di;
506 int n = 0, size, err;
507 u16 dev_num;
508
509 BT_DBG("");
510
511 if (get_user(dev_num, (u16 __user *) arg))
512 return -EFAULT;
513
514 if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
515 return -EINVAL;
516
517 size = sizeof(*dl) + dev_num * sizeof(*di);
518
519 dl = kzalloc(size, GFP_KERNEL);
520 if (!dl)
521 return -ENOMEM;
522
523 di = dl->dev_info;
524
525 mutex_lock(&rfcomm_dev_lock);
526
527 list_for_each_entry(dev, &rfcomm_dev_list, list) {
528 if (!tty_port_get(&dev->port))
529 continue;
530 (di + n)->id = dev->id;
531 (di + n)->flags = dev->flags;
532 (di + n)->state = dev->dlc->state;
533 (di + n)->channel = dev->channel;
534 bacpy(&(di + n)->src, &dev->src);
535 bacpy(&(di + n)->dst, &dev->dst);
536 tty_port_put(&dev->port);
537 if (++n >= dev_num)
538 break;
539 }
540
541 mutex_unlock(&rfcomm_dev_lock);
542
543 dl->dev_num = n;
544 size = sizeof(*dl) + n * sizeof(*di);
545
546 err = copy_to_user(arg, dl, size);
547 kfree(dl);
548
549 return err ? -EFAULT : 0;
550}
551
552static int rfcomm_get_dev_info(void __user *arg)
553{
554 struct rfcomm_dev *dev;
555 struct rfcomm_dev_info di;
556 int err = 0;
557
558 BT_DBG("");
559
560 if (copy_from_user(&di, arg, sizeof(di)))
561 return -EFAULT;
562
563 dev = rfcomm_dev_get(di.id);
564 if (!dev)
565 return -ENODEV;
566
567 di.flags = dev->flags;
568 di.channel = dev->channel;
569 di.state = dev->dlc->state;
570 bacpy(&di.src, &dev->src);
571 bacpy(&di.dst, &dev->dst);
572
573 if (copy_to_user(arg, &di, sizeof(di)))
574 err = -EFAULT;
575
576 tty_port_put(&dev->port);
577 return err;
578}
579
580int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
581{
582 BT_DBG("cmd %d arg %p", cmd, arg);
583
584 switch (cmd) {
585 case RFCOMMCREATEDEV:
586 return rfcomm_create_dev(sk, arg);
587
588 case RFCOMMRELEASEDEV:
589 return rfcomm_release_dev(arg);
590
591 case RFCOMMGETDEVLIST:
592 return rfcomm_get_dev_list(arg);
593
594 case RFCOMMGETDEVINFO:
595 return rfcomm_get_dev_info(arg);
596 }
597
598 return -EINVAL;
599}
600
601/* ---- DLC callbacks ---- */
602static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
603{
604 struct rfcomm_dev *dev = dlc->owner;
605
606 if (!dev) {
607 kfree_skb(skb);
608 return;
609 }
610
611 if (!skb_queue_empty(&dev->pending)) {
612 skb_queue_tail(&dev->pending, skb);
613 return;
614 }
615
616 BT_DBG("dlc %p len %d", dlc, skb->len);
617
618 tty_insert_flip_string(&dev->port, skb->data, skb->len);
619 tty_flip_buffer_push(&dev->port);
620
621 kfree_skb(skb);
622}
623
624static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
625{
626 struct rfcomm_dev *dev = dlc->owner;
627 if (!dev)
628 return;
629
630 BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
631
632 dev->err = err;
633 if (dlc->state == BT_CONNECTED) {
634 rfcomm_reparent_device(dev);
635
636 wake_up_interruptible(&dev->port.open_wait);
637 } else if (dlc->state == BT_CLOSED)
638 tty_port_tty_hangup(&dev->port, false);
639}
640
641static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
642{
643 struct rfcomm_dev *dev = dlc->owner;
644 if (!dev)
645 return;
646
647 BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
648
649 if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV))
650 tty_port_tty_hangup(&dev->port, true);
651
652 dev->modem_status =
653 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
654 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
655 ((v24_sig & RFCOMM_V24_IC) ? TIOCM_RI : 0) |
656 ((v24_sig & RFCOMM_V24_DV) ? TIOCM_CD : 0);
657}
658
659/* ---- TTY functions ---- */
660static void rfcomm_tty_copy_pending(struct rfcomm_dev *dev)
661{
662 struct sk_buff *skb;
663 int inserted = 0;
664
665 BT_DBG("dev %p", dev);
666
667 rfcomm_dlc_lock(dev->dlc);
668
669 while ((skb = skb_dequeue(&dev->pending))) {
670 inserted += tty_insert_flip_string(&dev->port, skb->data,
671 skb->len);
672 kfree_skb(skb);
673 }
674
675 rfcomm_dlc_unlock(dev->dlc);
676
677 if (inserted > 0)
678 tty_flip_buffer_push(&dev->port);
679}
680
681/* do the reverse of install, clearing the tty fields and releasing the
682 * reference to tty_port
683 */
684static void rfcomm_tty_cleanup(struct tty_struct *tty)
685{
686 struct rfcomm_dev *dev = tty->driver_data;
687
688 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
689
690 rfcomm_dlc_lock(dev->dlc);
691 tty->driver_data = NULL;
692 rfcomm_dlc_unlock(dev->dlc);
693
694 /*
695 * purge the dlc->tx_queue to avoid circular dependencies
696 * between dev and dlc
697 */
698 skb_queue_purge(&dev->dlc->tx_queue);
699
700 tty_port_put(&dev->port);
701}
702
703/* we acquire the tty_port reference since it's here the tty is first used
704 * by setting the termios. We also populate the driver_data field and install
705 * the tty port
706 */
707static int rfcomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
708{
709 struct rfcomm_dev *dev;
710 struct rfcomm_dlc *dlc;
711 int err;
712
713 dev = rfcomm_dev_get(tty->index);
714 if (!dev)
715 return -ENODEV;
716
717 dlc = dev->dlc;
718
719 /* Attach TTY and open DLC */
720 rfcomm_dlc_lock(dlc);
721 tty->driver_data = dev;
722 rfcomm_dlc_unlock(dlc);
723 set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
724
725 /* install the tty_port */
726 err = tty_port_install(&dev->port, driver, tty);
727 if (err) {
728 rfcomm_tty_cleanup(tty);
729 return err;
730 }
731
732 /* take over the tty_port reference if the port was created with the
733 * flag RFCOMM_RELEASE_ONHUP. This will force the release of the port
734 * when the last process closes the tty. The behaviour is expected by
735 * userspace.
736 */
737 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
738 set_bit(RFCOMM_TTY_OWNED, &dev->status);
739 tty_port_put(&dev->port);
740 }
741
742 return 0;
743}
744
745static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
746{
747 struct rfcomm_dev *dev = tty->driver_data;
748 int err;
749
750 BT_DBG("tty %p id %d", tty, tty->index);
751
752 BT_DBG("dev %p dst %pMR channel %d opened %d", dev, &dev->dst,
753 dev->channel, dev->port.count);
754
755 err = tty_port_open(&dev->port, tty, filp);
756 if (err)
757 return err;
758
759 /*
760 * FIXME: rfcomm should use proper flow control for
761 * received data. This hack will be unnecessary and can
762 * be removed when that's implemented
763 */
764 rfcomm_tty_copy_pending(dev);
765
766 rfcomm_dlc_unthrottle(dev->dlc);
767
768 return 0;
769}
770
771static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
772{
773 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
774
775 BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc,
776 dev->port.count);
777
778 tty_port_close(&dev->port, tty, filp);
779}
780
781static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
782{
783 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
784 struct rfcomm_dlc *dlc = dev->dlc;
785 struct sk_buff *skb;
786 int sent = 0, size;
787
788 BT_DBG("tty %p count %d", tty, count);
789
790 while (count) {
791 size = min_t(uint, count, dlc->mtu);
792
793 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
794 if (!skb)
795 break;
796
797 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
798
799 skb_put_data(skb, buf + sent, size);
800
801 rfcomm_dlc_send_noerror(dlc, skb);
802
803 sent += size;
804 count -= size;
805 }
806
807 return sent;
808}
809
810static int rfcomm_tty_write_room(struct tty_struct *tty)
811{
812 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
813 int room = 0;
814
815 if (dev && dev->dlc)
816 room = rfcomm_room(dev);
817
818 BT_DBG("tty %p room %d", tty, room);
819
820 return room;
821}
822
823static int rfcomm_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
824{
825 BT_DBG("tty %p cmd 0x%02x", tty, cmd);
826
827 switch (cmd) {
828 case TCGETS:
829 BT_DBG("TCGETS is not supported");
830 return -ENOIOCTLCMD;
831
832 case TCSETS:
833 BT_DBG("TCSETS is not supported");
834 return -ENOIOCTLCMD;
835
836 case TIOCMIWAIT:
837 BT_DBG("TIOCMIWAIT");
838 break;
839
840 case TIOCSERGETLSR:
841 BT_ERR("TIOCSERGETLSR is not supported");
842 return -ENOIOCTLCMD;
843
844 case TIOCSERCONFIG:
845 BT_ERR("TIOCSERCONFIG is not supported");
846 return -ENOIOCTLCMD;
847
848 default:
849 return -ENOIOCTLCMD; /* ioctls which we must ignore */
850
851 }
852
853 return -ENOIOCTLCMD;
854}
855
856static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
857{
858 struct ktermios *new = &tty->termios;
859 int old_baud_rate = tty_termios_baud_rate(old);
860 int new_baud_rate = tty_termios_baud_rate(new);
861
862 u8 baud, data_bits, stop_bits, parity, x_on, x_off;
863 u16 changes = 0;
864
865 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
866
867 BT_DBG("tty %p termios %p", tty, old);
868
869 if (!dev || !dev->dlc || !dev->dlc->session)
870 return;
871
872 /* Handle turning off CRTSCTS */
873 if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
874 BT_DBG("Turning off CRTSCTS unsupported");
875
876 /* Parity on/off and when on, odd/even */
877 if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
878 ((old->c_cflag & PARODD) != (new->c_cflag & PARODD))) {
879 changes |= RFCOMM_RPN_PM_PARITY;
880 BT_DBG("Parity change detected.");
881 }
882
883 /* Mark and space parity are not supported! */
884 if (new->c_cflag & PARENB) {
885 if (new->c_cflag & PARODD) {
886 BT_DBG("Parity is ODD");
887 parity = RFCOMM_RPN_PARITY_ODD;
888 } else {
889 BT_DBG("Parity is EVEN");
890 parity = RFCOMM_RPN_PARITY_EVEN;
891 }
892 } else {
893 BT_DBG("Parity is OFF");
894 parity = RFCOMM_RPN_PARITY_NONE;
895 }
896
897 /* Setting the x_on / x_off characters */
898 if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
899 BT_DBG("XOFF custom");
900 x_on = new->c_cc[VSTOP];
901 changes |= RFCOMM_RPN_PM_XON;
902 } else {
903 BT_DBG("XOFF default");
904 x_on = RFCOMM_RPN_XON_CHAR;
905 }
906
907 if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
908 BT_DBG("XON custom");
909 x_off = new->c_cc[VSTART];
910 changes |= RFCOMM_RPN_PM_XOFF;
911 } else {
912 BT_DBG("XON default");
913 x_off = RFCOMM_RPN_XOFF_CHAR;
914 }
915
916 /* Handle setting of stop bits */
917 if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
918 changes |= RFCOMM_RPN_PM_STOP;
919
920 /* POSIX does not support 1.5 stop bits and RFCOMM does not
921 * support 2 stop bits. So a request for 2 stop bits gets
922 * translated to 1.5 stop bits */
923 if (new->c_cflag & CSTOPB)
924 stop_bits = RFCOMM_RPN_STOP_15;
925 else
926 stop_bits = RFCOMM_RPN_STOP_1;
927
928 /* Handle number of data bits [5-8] */
929 if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
930 changes |= RFCOMM_RPN_PM_DATA;
931
932 switch (new->c_cflag & CSIZE) {
933 case CS5:
934 data_bits = RFCOMM_RPN_DATA_5;
935 break;
936 case CS6:
937 data_bits = RFCOMM_RPN_DATA_6;
938 break;
939 case CS7:
940 data_bits = RFCOMM_RPN_DATA_7;
941 break;
942 case CS8:
943 data_bits = RFCOMM_RPN_DATA_8;
944 break;
945 default:
946 data_bits = RFCOMM_RPN_DATA_8;
947 break;
948 }
949
950 /* Handle baudrate settings */
951 if (old_baud_rate != new_baud_rate)
952 changes |= RFCOMM_RPN_PM_BITRATE;
953
954 switch (new_baud_rate) {
955 case 2400:
956 baud = RFCOMM_RPN_BR_2400;
957 break;
958 case 4800:
959 baud = RFCOMM_RPN_BR_4800;
960 break;
961 case 7200:
962 baud = RFCOMM_RPN_BR_7200;
963 break;
964 case 9600:
965 baud = RFCOMM_RPN_BR_9600;
966 break;
967 case 19200:
968 baud = RFCOMM_RPN_BR_19200;
969 break;
970 case 38400:
971 baud = RFCOMM_RPN_BR_38400;
972 break;
973 case 57600:
974 baud = RFCOMM_RPN_BR_57600;
975 break;
976 case 115200:
977 baud = RFCOMM_RPN_BR_115200;
978 break;
979 case 230400:
980 baud = RFCOMM_RPN_BR_230400;
981 break;
982 default:
983 /* 9600 is standard accordinag to the RFCOMM specification */
984 baud = RFCOMM_RPN_BR_9600;
985 break;
986
987 }
988
989 if (changes)
990 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
991 data_bits, stop_bits, parity,
992 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
993}
994
995static void rfcomm_tty_throttle(struct tty_struct *tty)
996{
997 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
998
999 BT_DBG("tty %p dev %p", tty, dev);
1000
1001 rfcomm_dlc_throttle(dev->dlc);
1002}
1003
1004static void rfcomm_tty_unthrottle(struct tty_struct *tty)
1005{
1006 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1007
1008 BT_DBG("tty %p dev %p", tty, dev);
1009
1010 rfcomm_dlc_unthrottle(dev->dlc);
1011}
1012
1013static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
1014{
1015 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1016
1017 BT_DBG("tty %p dev %p", tty, dev);
1018
1019 if (!dev || !dev->dlc)
1020 return 0;
1021
1022 if (!skb_queue_empty(&dev->dlc->tx_queue))
1023 return dev->dlc->mtu;
1024
1025 return 0;
1026}
1027
1028static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
1029{
1030 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1031
1032 BT_DBG("tty %p dev %p", tty, dev);
1033
1034 if (!dev || !dev->dlc)
1035 return;
1036
1037 skb_queue_purge(&dev->dlc->tx_queue);
1038 tty_wakeup(tty);
1039}
1040
1041static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
1042{
1043 BT_DBG("tty %p ch %c", tty, ch);
1044}
1045
1046static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
1047{
1048 BT_DBG("tty %p timeout %d", tty, timeout);
1049}
1050
1051static void rfcomm_tty_hangup(struct tty_struct *tty)
1052{
1053 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1054
1055 BT_DBG("tty %p dev %p", tty, dev);
1056
1057 tty_port_hangup(&dev->port);
1058}
1059
1060static int rfcomm_tty_tiocmget(struct tty_struct *tty)
1061{
1062 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1063
1064 BT_DBG("tty %p dev %p", tty, dev);
1065
1066 return dev->modem_status;
1067}
1068
1069static int rfcomm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
1070{
1071 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1072 struct rfcomm_dlc *dlc = dev->dlc;
1073 u8 v24_sig;
1074
1075 BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
1076
1077 rfcomm_dlc_get_modem_status(dlc, &v24_sig);
1078
1079 if (set & TIOCM_DSR || set & TIOCM_DTR)
1080 v24_sig |= RFCOMM_V24_RTC;
1081 if (set & TIOCM_RTS || set & TIOCM_CTS)
1082 v24_sig |= RFCOMM_V24_RTR;
1083 if (set & TIOCM_RI)
1084 v24_sig |= RFCOMM_V24_IC;
1085 if (set & TIOCM_CD)
1086 v24_sig |= RFCOMM_V24_DV;
1087
1088 if (clear & TIOCM_DSR || clear & TIOCM_DTR)
1089 v24_sig &= ~RFCOMM_V24_RTC;
1090 if (clear & TIOCM_RTS || clear & TIOCM_CTS)
1091 v24_sig &= ~RFCOMM_V24_RTR;
1092 if (clear & TIOCM_RI)
1093 v24_sig &= ~RFCOMM_V24_IC;
1094 if (clear & TIOCM_CD)
1095 v24_sig &= ~RFCOMM_V24_DV;
1096
1097 rfcomm_dlc_set_modem_status(dlc, v24_sig);
1098
1099 return 0;
1100}
1101
1102/* ---- TTY structure ---- */
1103
1104static const struct tty_operations rfcomm_ops = {
1105 .open = rfcomm_tty_open,
1106 .close = rfcomm_tty_close,
1107 .write = rfcomm_tty_write,
1108 .write_room = rfcomm_tty_write_room,
1109 .chars_in_buffer = rfcomm_tty_chars_in_buffer,
1110 .flush_buffer = rfcomm_tty_flush_buffer,
1111 .ioctl = rfcomm_tty_ioctl,
1112 .throttle = rfcomm_tty_throttle,
1113 .unthrottle = rfcomm_tty_unthrottle,
1114 .set_termios = rfcomm_tty_set_termios,
1115 .send_xchar = rfcomm_tty_send_xchar,
1116 .hangup = rfcomm_tty_hangup,
1117 .wait_until_sent = rfcomm_tty_wait_until_sent,
1118 .tiocmget = rfcomm_tty_tiocmget,
1119 .tiocmset = rfcomm_tty_tiocmset,
1120 .install = rfcomm_tty_install,
1121 .cleanup = rfcomm_tty_cleanup,
1122};
1123
1124int __init rfcomm_init_ttys(void)
1125{
1126 int error;
1127
1128 rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
1129 if (!rfcomm_tty_driver)
1130 return -ENOMEM;
1131
1132 rfcomm_tty_driver->driver_name = "rfcomm";
1133 rfcomm_tty_driver->name = "rfcomm";
1134 rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR;
1135 rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR;
1136 rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1137 rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1138 rfcomm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1139 rfcomm_tty_driver->init_termios = tty_std_termios;
1140 rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
1141 rfcomm_tty_driver->init_termios.c_lflag &= ~ICANON;
1142 tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1143
1144 error = tty_register_driver(rfcomm_tty_driver);
1145 if (error) {
1146 BT_ERR("Can't register RFCOMM TTY driver");
1147 put_tty_driver(rfcomm_tty_driver);
1148 return error;
1149 }
1150
1151 BT_INFO("RFCOMM TTY layer initialized");
1152
1153 return 0;
1154}
1155
1156void rfcomm_cleanup_ttys(void)
1157{
1158 tty_unregister_driver(rfcomm_tty_driver);
1159 put_tty_driver(rfcomm_tty_driver);
1160}