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Bluetooth: Update version numbers
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / rfcomm / core.c
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 * Bluetooth RFCOMM core.
26 */
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/kernel.h>
31 #include <linux/sched.h>
32 #include <linux/signal.h>
33 #include <linux/init.h>
34 #include <linux/wait.h>
35 #include <linux/device.h>
36 #include <linux/net.h>
37 #include <linux/mutex.h>
38 #include <linux/kthread.h>
39
40 #include <net/sock.h>
41 #include <asm/uaccess.h>
42 #include <asm/unaligned.h>
43
44 #include <net/bluetooth/bluetooth.h>
45 #include <net/bluetooth/hci_core.h>
46 #include <net/bluetooth/l2cap.h>
47 #include <net/bluetooth/rfcomm.h>
48
49 #define VERSION "1.11"
50
51 static int disable_cfc = 0;
52 static int channel_mtu = -1;
53 static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
54
55 static struct task_struct *rfcomm_thread;
56
57 static DEFINE_MUTEX(rfcomm_mutex);
58 #define rfcomm_lock() mutex_lock(&rfcomm_mutex)
59 #define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
60
61 static unsigned long rfcomm_event;
62
63 static LIST_HEAD(session_list);
64
65 static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
66 static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
67 static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
68 static int rfcomm_queue_disc(struct rfcomm_dlc *d);
69 static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
70 static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
71 static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
72 static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
73 static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
74 static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
75
76 static void rfcomm_process_connect(struct rfcomm_session *s);
77
78 static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err);
79 static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
80 static void rfcomm_session_del(struct rfcomm_session *s);
81
82 /* ---- RFCOMM frame parsing macros ---- */
83 #define __get_dlci(b) ((b & 0xfc) >> 2)
84 #define __get_channel(b) ((b & 0xf8) >> 3)
85 #define __get_dir(b) ((b & 0x04) >> 2)
86 #define __get_type(b) ((b & 0xef))
87
88 #define __test_ea(b) ((b & 0x01))
89 #define __test_cr(b) ((b & 0x02))
90 #define __test_pf(b) ((b & 0x10))
91
92 #define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
93 #define __ctrl(type, pf) (((type & 0xef) | (pf << 4)))
94 #define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir)
95 #define __srv_channel(dlci) (dlci >> 1)
96 #define __dir(dlci) (dlci & 0x01)
97
98 #define __len8(len) (((len) << 1) | 1)
99 #define __len16(len) ((len) << 1)
100
101 /* MCC macros */
102 #define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01))
103 #define __get_mcc_type(b) ((b & 0xfc) >> 2)
104 #define __get_mcc_len(b) ((b & 0xfe) >> 1)
105
106 /* RPN macros */
107 #define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
108 #define __get_rpn_data_bits(line) ((line) & 0x3)
109 #define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
110 #define __get_rpn_parity(line) (((line) >> 3) & 0x7)
111
112 static inline void rfcomm_schedule(uint event)
113 {
114 if (!rfcomm_thread)
115 return;
116 //set_bit(event, &rfcomm_event);
117 set_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
118 wake_up_process(rfcomm_thread);
119 }
120
121 static inline void rfcomm_session_put(struct rfcomm_session *s)
122 {
123 if (atomic_dec_and_test(&s->refcnt))
124 rfcomm_session_del(s);
125 }
126
127 /* ---- RFCOMM FCS computation ---- */
128
129 /* reversed, 8-bit, poly=0x07 */
130 static unsigned char rfcomm_crc_table[256] = {
131 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
132 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
133 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
134 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
135
136 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
137 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
138 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
139 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
140
141 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
142 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
143 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
144 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
145
146 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
147 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
148 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
149 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
150
151 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
152 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
153 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
154 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
155
156 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
157 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
158 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
159 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
160
161 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
162 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
163 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
164 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
165
166 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
167 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
168 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
169 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
170 };
171
172 /* CRC on 2 bytes */
173 #define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
174
175 /* FCS on 2 bytes */
176 static inline u8 __fcs(u8 *data)
177 {
178 return (0xff - __crc(data));
179 }
180
181 /* FCS on 3 bytes */
182 static inline u8 __fcs2(u8 *data)
183 {
184 return (0xff - rfcomm_crc_table[__crc(data) ^ data[2]]);
185 }
186
187 /* Check FCS */
188 static inline int __check_fcs(u8 *data, int type, u8 fcs)
189 {
190 u8 f = __crc(data);
191
192 if (type != RFCOMM_UIH)
193 f = rfcomm_crc_table[f ^ data[2]];
194
195 return rfcomm_crc_table[f ^ fcs] != 0xcf;
196 }
197
198 /* ---- L2CAP callbacks ---- */
199 static void rfcomm_l2state_change(struct sock *sk)
200 {
201 BT_DBG("%p state %d", sk, sk->sk_state);
202 rfcomm_schedule(RFCOMM_SCHED_STATE);
203 }
204
205 static void rfcomm_l2data_ready(struct sock *sk, int bytes)
206 {
207 BT_DBG("%p bytes %d", sk, bytes);
208 rfcomm_schedule(RFCOMM_SCHED_RX);
209 }
210
211 static int rfcomm_l2sock_create(struct socket **sock)
212 {
213 int err;
214
215 BT_DBG("");
216
217 err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
218 if (!err) {
219 struct sock *sk = (*sock)->sk;
220 sk->sk_data_ready = rfcomm_l2data_ready;
221 sk->sk_state_change = rfcomm_l2state_change;
222 }
223 return err;
224 }
225
226 static inline int rfcomm_check_security(struct rfcomm_dlc *d)
227 {
228 struct sock *sk = d->session->sock->sk;
229
230 return hci_conn_security(l2cap_pi(sk)->conn->hcon, d->sec_level);
231 }
232
233 /* ---- RFCOMM DLCs ---- */
234 static void rfcomm_dlc_timeout(unsigned long arg)
235 {
236 struct rfcomm_dlc *d = (void *) arg;
237
238 BT_DBG("dlc %p state %ld", d, d->state);
239
240 set_bit(RFCOMM_TIMED_OUT, &d->flags);
241 rfcomm_dlc_put(d);
242 rfcomm_schedule(RFCOMM_SCHED_TIMEO);
243 }
244
245 static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
246 {
247 BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);
248
249 if (!mod_timer(&d->timer, jiffies + timeout))
250 rfcomm_dlc_hold(d);
251 }
252
253 static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
254 {
255 BT_DBG("dlc %p state %ld", d, d->state);
256
257 if (timer_pending(&d->timer) && del_timer(&d->timer))
258 rfcomm_dlc_put(d);
259 }
260
261 static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
262 {
263 BT_DBG("%p", d);
264
265 d->state = BT_OPEN;
266 d->flags = 0;
267 d->mscex = 0;
268 d->mtu = RFCOMM_DEFAULT_MTU;
269 d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV;
270
271 d->cfc = RFCOMM_CFC_DISABLED;
272 d->rx_credits = RFCOMM_DEFAULT_CREDITS;
273 }
274
275 struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
276 {
277 struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);
278
279 if (!d)
280 return NULL;
281
282 setup_timer(&d->timer, rfcomm_dlc_timeout, (unsigned long)d);
283
284 skb_queue_head_init(&d->tx_queue);
285 spin_lock_init(&d->lock);
286 atomic_set(&d->refcnt, 1);
287
288 rfcomm_dlc_clear_state(d);
289
290 BT_DBG("%p", d);
291
292 return d;
293 }
294
295 void rfcomm_dlc_free(struct rfcomm_dlc *d)
296 {
297 BT_DBG("%p", d);
298
299 skb_queue_purge(&d->tx_queue);
300 kfree(d);
301 }
302
303 static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
304 {
305 BT_DBG("dlc %p session %p", d, s);
306
307 rfcomm_session_hold(s);
308
309 rfcomm_dlc_hold(d);
310 list_add(&d->list, &s->dlcs);
311 d->session = s;
312 }
313
314 static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
315 {
316 struct rfcomm_session *s = d->session;
317
318 BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s);
319
320 list_del(&d->list);
321 d->session = NULL;
322 rfcomm_dlc_put(d);
323
324 rfcomm_session_put(s);
325 }
326
327 static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
328 {
329 struct rfcomm_dlc *d;
330 struct list_head *p;
331
332 list_for_each(p, &s->dlcs) {
333 d = list_entry(p, struct rfcomm_dlc, list);
334 if (d->dlci == dlci)
335 return d;
336 }
337 return NULL;
338 }
339
340 static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
341 {
342 struct rfcomm_session *s;
343 int err = 0;
344 u8 dlci;
345
346 BT_DBG("dlc %p state %ld %s %s channel %d",
347 d, d->state, batostr(src), batostr(dst), channel);
348
349 if (channel < 1 || channel > 30)
350 return -EINVAL;
351
352 if (d->state != BT_OPEN && d->state != BT_CLOSED)
353 return 0;
354
355 s = rfcomm_session_get(src, dst);
356 if (!s) {
357 s = rfcomm_session_create(src, dst, &err);
358 if (!s)
359 return err;
360 }
361
362 dlci = __dlci(!s->initiator, channel);
363
364 /* Check if DLCI already exists */
365 if (rfcomm_dlc_get(s, dlci))
366 return -EBUSY;
367
368 rfcomm_dlc_clear_state(d);
369
370 d->dlci = dlci;
371 d->addr = __addr(s->initiator, dlci);
372 d->priority = 7;
373
374 d->state = BT_CONFIG;
375 rfcomm_dlc_link(s, d);
376
377 d->out = 1;
378
379 d->mtu = s->mtu;
380 d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;
381
382 if (s->state == BT_CONNECTED) {
383 if (rfcomm_check_security(d))
384 rfcomm_send_pn(s, 1, d);
385 else
386 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
387 }
388
389 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
390
391 return 0;
392 }
393
394 int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
395 {
396 int r;
397
398 rfcomm_lock();
399
400 r = __rfcomm_dlc_open(d, src, dst, channel);
401
402 rfcomm_unlock();
403 return r;
404 }
405
406 static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
407 {
408 struct rfcomm_session *s = d->session;
409 if (!s)
410 return 0;
411
412 BT_DBG("dlc %p state %ld dlci %d err %d session %p",
413 d, d->state, d->dlci, err, s);
414
415 switch (d->state) {
416 case BT_CONNECT:
417 case BT_CONFIG:
418 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
419 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
420 rfcomm_schedule(RFCOMM_SCHED_AUTH);
421 break;
422 }
423 /* Fall through */
424
425 case BT_CONNECTED:
426 d->state = BT_DISCONN;
427 if (skb_queue_empty(&d->tx_queue)) {
428 rfcomm_send_disc(s, d->dlci);
429 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
430 } else {
431 rfcomm_queue_disc(d);
432 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
433 }
434 break;
435
436 case BT_OPEN:
437 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
438 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
439 rfcomm_schedule(RFCOMM_SCHED_AUTH);
440 break;
441 }
442 /* Fall through */
443
444 default:
445 rfcomm_dlc_clear_timer(d);
446
447 rfcomm_dlc_lock(d);
448 d->state = BT_CLOSED;
449 d->state_change(d, err);
450 rfcomm_dlc_unlock(d);
451
452 skb_queue_purge(&d->tx_queue);
453 rfcomm_dlc_unlink(d);
454 }
455
456 return 0;
457 }
458
459 int rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
460 {
461 int r;
462
463 rfcomm_lock();
464
465 r = __rfcomm_dlc_close(d, err);
466
467 rfcomm_unlock();
468 return r;
469 }
470
471 int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
472 {
473 int len = skb->len;
474
475 if (d->state != BT_CONNECTED)
476 return -ENOTCONN;
477
478 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
479
480 if (len > d->mtu)
481 return -EINVAL;
482
483 rfcomm_make_uih(skb, d->addr);
484 skb_queue_tail(&d->tx_queue, skb);
485
486 if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
487 rfcomm_schedule(RFCOMM_SCHED_TX);
488 return len;
489 }
490
491 void __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
492 {
493 BT_DBG("dlc %p state %ld", d, d->state);
494
495 if (!d->cfc) {
496 d->v24_sig |= RFCOMM_V24_FC;
497 set_bit(RFCOMM_MSC_PENDING, &d->flags);
498 }
499 rfcomm_schedule(RFCOMM_SCHED_TX);
500 }
501
502 void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
503 {
504 BT_DBG("dlc %p state %ld", d, d->state);
505
506 if (!d->cfc) {
507 d->v24_sig &= ~RFCOMM_V24_FC;
508 set_bit(RFCOMM_MSC_PENDING, &d->flags);
509 }
510 rfcomm_schedule(RFCOMM_SCHED_TX);
511 }
512
513 /*
514 Set/get modem status functions use _local_ status i.e. what we report
515 to the other side.
516 Remote status is provided by dlc->modem_status() callback.
517 */
518 int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig)
519 {
520 BT_DBG("dlc %p state %ld v24_sig 0x%x",
521 d, d->state, v24_sig);
522
523 if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
524 v24_sig |= RFCOMM_V24_FC;
525 else
526 v24_sig &= ~RFCOMM_V24_FC;
527
528 d->v24_sig = v24_sig;
529
530 if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags))
531 rfcomm_schedule(RFCOMM_SCHED_TX);
532
533 return 0;
534 }
535
536 int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig)
537 {
538 BT_DBG("dlc %p state %ld v24_sig 0x%x",
539 d, d->state, d->v24_sig);
540
541 *v24_sig = d->v24_sig;
542 return 0;
543 }
544
545 /* ---- RFCOMM sessions ---- */
546 static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
547 {
548 struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL);
549
550 if (!s)
551 return NULL;
552
553 BT_DBG("session %p sock %p", s, sock);
554
555 INIT_LIST_HEAD(&s->dlcs);
556 s->state = state;
557 s->sock = sock;
558
559 s->mtu = RFCOMM_DEFAULT_MTU;
560 s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;
561
562 /* Do not increment module usage count for listening sessions.
563 * Otherwise we won't be able to unload the module. */
564 if (state != BT_LISTEN)
565 if (!try_module_get(THIS_MODULE)) {
566 kfree(s);
567 return NULL;
568 }
569
570 list_add(&s->list, &session_list);
571
572 return s;
573 }
574
575 static void rfcomm_session_del(struct rfcomm_session *s)
576 {
577 int state = s->state;
578
579 BT_DBG("session %p state %ld", s, s->state);
580
581 list_del(&s->list);
582
583 if (state == BT_CONNECTED)
584 rfcomm_send_disc(s, 0);
585
586 sock_release(s->sock);
587 kfree(s);
588
589 if (state != BT_LISTEN)
590 module_put(THIS_MODULE);
591 }
592
593 static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst)
594 {
595 struct rfcomm_session *s;
596 struct list_head *p, *n;
597 struct bt_sock *sk;
598 list_for_each_safe(p, n, &session_list) {
599 s = list_entry(p, struct rfcomm_session, list);
600 sk = bt_sk(s->sock->sk);
601
602 if ((!bacmp(src, BDADDR_ANY) || !bacmp(&sk->src, src)) &&
603 !bacmp(&sk->dst, dst))
604 return s;
605 }
606 return NULL;
607 }
608
609 static void rfcomm_session_close(struct rfcomm_session *s, int err)
610 {
611 struct rfcomm_dlc *d;
612 struct list_head *p, *n;
613
614 BT_DBG("session %p state %ld err %d", s, s->state, err);
615
616 rfcomm_session_hold(s);
617
618 s->state = BT_CLOSED;
619
620 /* Close all dlcs */
621 list_for_each_safe(p, n, &s->dlcs) {
622 d = list_entry(p, struct rfcomm_dlc, list);
623 d->state = BT_CLOSED;
624 __rfcomm_dlc_close(d, err);
625 }
626
627 rfcomm_session_put(s);
628 }
629
630 static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err)
631 {
632 struct rfcomm_session *s = NULL;
633 struct sockaddr_l2 addr;
634 struct socket *sock;
635 struct sock *sk;
636
637 BT_DBG("%s %s", batostr(src), batostr(dst));
638
639 *err = rfcomm_l2sock_create(&sock);
640 if (*err < 0)
641 return NULL;
642
643 bacpy(&addr.l2_bdaddr, src);
644 addr.l2_family = AF_BLUETOOTH;
645 addr.l2_psm = 0;
646 *err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
647 if (*err < 0)
648 goto failed;
649
650 /* Set L2CAP options */
651 sk = sock->sk;
652 lock_sock(sk);
653 l2cap_pi(sk)->imtu = l2cap_mtu;
654 release_sock(sk);
655
656 s = rfcomm_session_add(sock, BT_BOUND);
657 if (!s) {
658 *err = -ENOMEM;
659 goto failed;
660 }
661
662 s->initiator = 1;
663
664 bacpy(&addr.l2_bdaddr, dst);
665 addr.l2_family = AF_BLUETOOTH;
666 addr.l2_psm = htobs(RFCOMM_PSM);
667 *err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
668 if (*err == 0 || *err == -EINPROGRESS)
669 return s;
670
671 rfcomm_session_del(s);
672 return NULL;
673
674 failed:
675 sock_release(sock);
676 return NULL;
677 }
678
679 void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst)
680 {
681 struct sock *sk = s->sock->sk;
682 if (src)
683 bacpy(src, &bt_sk(sk)->src);
684 if (dst)
685 bacpy(dst, &bt_sk(sk)->dst);
686 }
687
688 /* ---- RFCOMM frame sending ---- */
689 static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len)
690 {
691 struct socket *sock = s->sock;
692 struct kvec iv = { data, len };
693 struct msghdr msg;
694
695 BT_DBG("session %p len %d", s, len);
696
697 memset(&msg, 0, sizeof(msg));
698
699 return kernel_sendmsg(sock, &msg, &iv, 1, len);
700 }
701
702 static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci)
703 {
704 struct rfcomm_cmd cmd;
705
706 BT_DBG("%p dlci %d", s, dlci);
707
708 cmd.addr = __addr(s->initiator, dlci);
709 cmd.ctrl = __ctrl(RFCOMM_SABM, 1);
710 cmd.len = __len8(0);
711 cmd.fcs = __fcs2((u8 *) &cmd);
712
713 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
714 }
715
716 static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci)
717 {
718 struct rfcomm_cmd cmd;
719
720 BT_DBG("%p dlci %d", s, dlci);
721
722 cmd.addr = __addr(!s->initiator, dlci);
723 cmd.ctrl = __ctrl(RFCOMM_UA, 1);
724 cmd.len = __len8(0);
725 cmd.fcs = __fcs2((u8 *) &cmd);
726
727 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
728 }
729
730 static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci)
731 {
732 struct rfcomm_cmd cmd;
733
734 BT_DBG("%p dlci %d", s, dlci);
735
736 cmd.addr = __addr(s->initiator, dlci);
737 cmd.ctrl = __ctrl(RFCOMM_DISC, 1);
738 cmd.len = __len8(0);
739 cmd.fcs = __fcs2((u8 *) &cmd);
740
741 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
742 }
743
744 static int rfcomm_queue_disc(struct rfcomm_dlc *d)
745 {
746 struct rfcomm_cmd *cmd;
747 struct sk_buff *skb;
748
749 BT_DBG("dlc %p dlci %d", d, d->dlci);
750
751 skb = alloc_skb(sizeof(*cmd), GFP_KERNEL);
752 if (!skb)
753 return -ENOMEM;
754
755 cmd = (void *) __skb_put(skb, sizeof(*cmd));
756 cmd->addr = d->addr;
757 cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
758 cmd->len = __len8(0);
759 cmd->fcs = __fcs2((u8 *) cmd);
760
761 skb_queue_tail(&d->tx_queue, skb);
762 rfcomm_schedule(RFCOMM_SCHED_TX);
763 return 0;
764 }
765
766 static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci)
767 {
768 struct rfcomm_cmd cmd;
769
770 BT_DBG("%p dlci %d", s, dlci);
771
772 cmd.addr = __addr(!s->initiator, dlci);
773 cmd.ctrl = __ctrl(RFCOMM_DM, 1);
774 cmd.len = __len8(0);
775 cmd.fcs = __fcs2((u8 *) &cmd);
776
777 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
778 }
779
780 static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type)
781 {
782 struct rfcomm_hdr *hdr;
783 struct rfcomm_mcc *mcc;
784 u8 buf[16], *ptr = buf;
785
786 BT_DBG("%p cr %d type %d", s, cr, type);
787
788 hdr = (void *) ptr; ptr += sizeof(*hdr);
789 hdr->addr = __addr(s->initiator, 0);
790 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
791 hdr->len = __len8(sizeof(*mcc) + 1);
792
793 mcc = (void *) ptr; ptr += sizeof(*mcc);
794 mcc->type = __mcc_type(cr, RFCOMM_NSC);
795 mcc->len = __len8(1);
796
797 /* Type that we didn't like */
798 *ptr = __mcc_type(cr, type); ptr++;
799
800 *ptr = __fcs(buf); ptr++;
801
802 return rfcomm_send_frame(s, buf, ptr - buf);
803 }
804
805 static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d)
806 {
807 struct rfcomm_hdr *hdr;
808 struct rfcomm_mcc *mcc;
809 struct rfcomm_pn *pn;
810 u8 buf[16], *ptr = buf;
811
812 BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu);
813
814 hdr = (void *) ptr; ptr += sizeof(*hdr);
815 hdr->addr = __addr(s->initiator, 0);
816 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
817 hdr->len = __len8(sizeof(*mcc) + sizeof(*pn));
818
819 mcc = (void *) ptr; ptr += sizeof(*mcc);
820 mcc->type = __mcc_type(cr, RFCOMM_PN);
821 mcc->len = __len8(sizeof(*pn));
822
823 pn = (void *) ptr; ptr += sizeof(*pn);
824 pn->dlci = d->dlci;
825 pn->priority = d->priority;
826 pn->ack_timer = 0;
827 pn->max_retrans = 0;
828
829 if (s->cfc) {
830 pn->flow_ctrl = cr ? 0xf0 : 0xe0;
831 pn->credits = RFCOMM_DEFAULT_CREDITS;
832 } else {
833 pn->flow_ctrl = 0;
834 pn->credits = 0;
835 }
836
837 if (cr && channel_mtu >= 0)
838 pn->mtu = htobs(channel_mtu);
839 else
840 pn->mtu = htobs(d->mtu);
841
842 *ptr = __fcs(buf); ptr++;
843
844 return rfcomm_send_frame(s, buf, ptr - buf);
845 }
846
847 int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
848 u8 bit_rate, u8 data_bits, u8 stop_bits,
849 u8 parity, u8 flow_ctrl_settings,
850 u8 xon_char, u8 xoff_char, u16 param_mask)
851 {
852 struct rfcomm_hdr *hdr;
853 struct rfcomm_mcc *mcc;
854 struct rfcomm_rpn *rpn;
855 u8 buf[16], *ptr = buf;
856
857 BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x"
858 " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x",
859 s, cr, dlci, bit_rate, data_bits, stop_bits, parity,
860 flow_ctrl_settings, xon_char, xoff_char, param_mask);
861
862 hdr = (void *) ptr; ptr += sizeof(*hdr);
863 hdr->addr = __addr(s->initiator, 0);
864 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
865 hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn));
866
867 mcc = (void *) ptr; ptr += sizeof(*mcc);
868 mcc->type = __mcc_type(cr, RFCOMM_RPN);
869 mcc->len = __len8(sizeof(*rpn));
870
871 rpn = (void *) ptr; ptr += sizeof(*rpn);
872 rpn->dlci = __addr(1, dlci);
873 rpn->bit_rate = bit_rate;
874 rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity);
875 rpn->flow_ctrl = flow_ctrl_settings;
876 rpn->xon_char = xon_char;
877 rpn->xoff_char = xoff_char;
878 rpn->param_mask = cpu_to_le16(param_mask);
879
880 *ptr = __fcs(buf); ptr++;
881
882 return rfcomm_send_frame(s, buf, ptr - buf);
883 }
884
885 static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status)
886 {
887 struct rfcomm_hdr *hdr;
888 struct rfcomm_mcc *mcc;
889 struct rfcomm_rls *rls;
890 u8 buf[16], *ptr = buf;
891
892 BT_DBG("%p cr %d status 0x%x", s, cr, status);
893
894 hdr = (void *) ptr; ptr += sizeof(*hdr);
895 hdr->addr = __addr(s->initiator, 0);
896 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
897 hdr->len = __len8(sizeof(*mcc) + sizeof(*rls));
898
899 mcc = (void *) ptr; ptr += sizeof(*mcc);
900 mcc->type = __mcc_type(cr, RFCOMM_RLS);
901 mcc->len = __len8(sizeof(*rls));
902
903 rls = (void *) ptr; ptr += sizeof(*rls);
904 rls->dlci = __addr(1, dlci);
905 rls->status = status;
906
907 *ptr = __fcs(buf); ptr++;
908
909 return rfcomm_send_frame(s, buf, ptr - buf);
910 }
911
912 static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig)
913 {
914 struct rfcomm_hdr *hdr;
915 struct rfcomm_mcc *mcc;
916 struct rfcomm_msc *msc;
917 u8 buf[16], *ptr = buf;
918
919 BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig);
920
921 hdr = (void *) ptr; ptr += sizeof(*hdr);
922 hdr->addr = __addr(s->initiator, 0);
923 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
924 hdr->len = __len8(sizeof(*mcc) + sizeof(*msc));
925
926 mcc = (void *) ptr; ptr += sizeof(*mcc);
927 mcc->type = __mcc_type(cr, RFCOMM_MSC);
928 mcc->len = __len8(sizeof(*msc));
929
930 msc = (void *) ptr; ptr += sizeof(*msc);
931 msc->dlci = __addr(1, dlci);
932 msc->v24_sig = v24_sig | 0x01;
933
934 *ptr = __fcs(buf); ptr++;
935
936 return rfcomm_send_frame(s, buf, ptr - buf);
937 }
938
939 static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr)
940 {
941 struct rfcomm_hdr *hdr;
942 struct rfcomm_mcc *mcc;
943 u8 buf[16], *ptr = buf;
944
945 BT_DBG("%p cr %d", s, cr);
946
947 hdr = (void *) ptr; ptr += sizeof(*hdr);
948 hdr->addr = __addr(s->initiator, 0);
949 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
950 hdr->len = __len8(sizeof(*mcc));
951
952 mcc = (void *) ptr; ptr += sizeof(*mcc);
953 mcc->type = __mcc_type(cr, RFCOMM_FCOFF);
954 mcc->len = __len8(0);
955
956 *ptr = __fcs(buf); ptr++;
957
958 return rfcomm_send_frame(s, buf, ptr - buf);
959 }
960
961 static int rfcomm_send_fcon(struct rfcomm_session *s, int cr)
962 {
963 struct rfcomm_hdr *hdr;
964 struct rfcomm_mcc *mcc;
965 u8 buf[16], *ptr = buf;
966
967 BT_DBG("%p cr %d", s, cr);
968
969 hdr = (void *) ptr; ptr += sizeof(*hdr);
970 hdr->addr = __addr(s->initiator, 0);
971 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
972 hdr->len = __len8(sizeof(*mcc));
973
974 mcc = (void *) ptr; ptr += sizeof(*mcc);
975 mcc->type = __mcc_type(cr, RFCOMM_FCON);
976 mcc->len = __len8(0);
977
978 *ptr = __fcs(buf); ptr++;
979
980 return rfcomm_send_frame(s, buf, ptr - buf);
981 }
982
983 static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len)
984 {
985 struct socket *sock = s->sock;
986 struct kvec iv[3];
987 struct msghdr msg;
988 unsigned char hdr[5], crc[1];
989
990 if (len > 125)
991 return -EINVAL;
992
993 BT_DBG("%p cr %d", s, cr);
994
995 hdr[0] = __addr(s->initiator, 0);
996 hdr[1] = __ctrl(RFCOMM_UIH, 0);
997 hdr[2] = 0x01 | ((len + 2) << 1);
998 hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2);
999 hdr[4] = 0x01 | (len << 1);
1000
1001 crc[0] = __fcs(hdr);
1002
1003 iv[0].iov_base = hdr;
1004 iv[0].iov_len = 5;
1005 iv[1].iov_base = pattern;
1006 iv[1].iov_len = len;
1007 iv[2].iov_base = crc;
1008 iv[2].iov_len = 1;
1009
1010 memset(&msg, 0, sizeof(msg));
1011
1012 return kernel_sendmsg(sock, &msg, iv, 3, 6 + len);
1013 }
1014
1015 static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits)
1016 {
1017 struct rfcomm_hdr *hdr;
1018 u8 buf[16], *ptr = buf;
1019
1020 BT_DBG("%p addr %d credits %d", s, addr, credits);
1021
1022 hdr = (void *) ptr; ptr += sizeof(*hdr);
1023 hdr->addr = addr;
1024 hdr->ctrl = __ctrl(RFCOMM_UIH, 1);
1025 hdr->len = __len8(0);
1026
1027 *ptr = credits; ptr++;
1028
1029 *ptr = __fcs(buf); ptr++;
1030
1031 return rfcomm_send_frame(s, buf, ptr - buf);
1032 }
1033
1034 static void rfcomm_make_uih(struct sk_buff *skb, u8 addr)
1035 {
1036 struct rfcomm_hdr *hdr;
1037 int len = skb->len;
1038 u8 *crc;
1039
1040 if (len > 127) {
1041 hdr = (void *) skb_push(skb, 4);
1042 put_unaligned(htobs(__len16(len)), (__le16 *) &hdr->len);
1043 } else {
1044 hdr = (void *) skb_push(skb, 3);
1045 hdr->len = __len8(len);
1046 }
1047 hdr->addr = addr;
1048 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1049
1050 crc = skb_put(skb, 1);
1051 *crc = __fcs((void *) hdr);
1052 }
1053
1054 /* ---- RFCOMM frame reception ---- */
1055 static int rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci)
1056 {
1057 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1058
1059 if (dlci) {
1060 /* Data channel */
1061 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1062 if (!d) {
1063 rfcomm_send_dm(s, dlci);
1064 return 0;
1065 }
1066
1067 switch (d->state) {
1068 case BT_CONNECT:
1069 rfcomm_dlc_clear_timer(d);
1070
1071 rfcomm_dlc_lock(d);
1072 d->state = BT_CONNECTED;
1073 d->state_change(d, 0);
1074 rfcomm_dlc_unlock(d);
1075
1076 rfcomm_send_msc(s, 1, dlci, d->v24_sig);
1077 break;
1078
1079 case BT_DISCONN:
1080 d->state = BT_CLOSED;
1081 __rfcomm_dlc_close(d, 0);
1082
1083 if (list_empty(&s->dlcs)) {
1084 s->state = BT_DISCONN;
1085 rfcomm_send_disc(s, 0);
1086 }
1087
1088 break;
1089 }
1090 } else {
1091 /* Control channel */
1092 switch (s->state) {
1093 case BT_CONNECT:
1094 s->state = BT_CONNECTED;
1095 rfcomm_process_connect(s);
1096 break;
1097
1098 case BT_DISCONN:
1099 rfcomm_session_put(s);
1100 break;
1101 }
1102 }
1103 return 0;
1104 }
1105
1106 static int rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci)
1107 {
1108 int err = 0;
1109
1110 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1111
1112 if (dlci) {
1113 /* Data DLC */
1114 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1115 if (d) {
1116 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1117 err = ECONNREFUSED;
1118 else
1119 err = ECONNRESET;
1120
1121 d->state = BT_CLOSED;
1122 __rfcomm_dlc_close(d, err);
1123 }
1124 } else {
1125 if (s->state == BT_CONNECT)
1126 err = ECONNREFUSED;
1127 else
1128 err = ECONNRESET;
1129
1130 s->state = BT_CLOSED;
1131 rfcomm_session_close(s, err);
1132 }
1133 return 0;
1134 }
1135
1136 static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci)
1137 {
1138 int err = 0;
1139
1140 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1141
1142 if (dlci) {
1143 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1144 if (d) {
1145 rfcomm_send_ua(s, dlci);
1146
1147 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1148 err = ECONNREFUSED;
1149 else
1150 err = ECONNRESET;
1151
1152 d->state = BT_CLOSED;
1153 __rfcomm_dlc_close(d, err);
1154 } else
1155 rfcomm_send_dm(s, dlci);
1156
1157 } else {
1158 rfcomm_send_ua(s, 0);
1159
1160 if (s->state == BT_CONNECT)
1161 err = ECONNREFUSED;
1162 else
1163 err = ECONNRESET;
1164
1165 s->state = BT_CLOSED;
1166 rfcomm_session_close(s, err);
1167 }
1168
1169 return 0;
1170 }
1171
1172 void rfcomm_dlc_accept(struct rfcomm_dlc *d)
1173 {
1174 struct sock *sk = d->session->sock->sk;
1175
1176 BT_DBG("dlc %p", d);
1177
1178 rfcomm_send_ua(d->session, d->dlci);
1179
1180 rfcomm_dlc_lock(d);
1181 d->state = BT_CONNECTED;
1182 d->state_change(d, 0);
1183 rfcomm_dlc_unlock(d);
1184
1185 if (d->role_switch)
1186 hci_conn_switch_role(l2cap_pi(sk)->conn->hcon, 0x00);
1187
1188 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1189 }
1190
1191 static void rfcomm_check_accept(struct rfcomm_dlc *d)
1192 {
1193 if (rfcomm_check_security(d)) {
1194 if (d->defer_setup) {
1195 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1196 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1197 } else
1198 rfcomm_dlc_accept(d);
1199 } else {
1200 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1201 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1202 }
1203 }
1204
1205 static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
1206 {
1207 struct rfcomm_dlc *d;
1208 u8 channel;
1209
1210 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1211
1212 if (!dlci) {
1213 rfcomm_send_ua(s, 0);
1214
1215 if (s->state == BT_OPEN) {
1216 s->state = BT_CONNECTED;
1217 rfcomm_process_connect(s);
1218 }
1219 return 0;
1220 }
1221
1222 /* Check if DLC exists */
1223 d = rfcomm_dlc_get(s, dlci);
1224 if (d) {
1225 if (d->state == BT_OPEN) {
1226 /* DLC was previously opened by PN request */
1227 rfcomm_check_accept(d);
1228 }
1229 return 0;
1230 }
1231
1232 /* Notify socket layer about incoming connection */
1233 channel = __srv_channel(dlci);
1234 if (rfcomm_connect_ind(s, channel, &d)) {
1235 d->dlci = dlci;
1236 d->addr = __addr(s->initiator, dlci);
1237 rfcomm_dlc_link(s, d);
1238
1239 rfcomm_check_accept(d);
1240 } else {
1241 rfcomm_send_dm(s, dlci);
1242 }
1243
1244 return 0;
1245 }
1246
1247 static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
1248 {
1249 struct rfcomm_session *s = d->session;
1250
1251 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
1252 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);
1253
1254 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
1255 pn->flow_ctrl == 0xe0) {
1256 d->cfc = RFCOMM_CFC_ENABLED;
1257 d->tx_credits = pn->credits;
1258 } else {
1259 d->cfc = RFCOMM_CFC_DISABLED;
1260 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1261 }
1262
1263 if (s->cfc == RFCOMM_CFC_UNKNOWN)
1264 s->cfc = d->cfc;
1265
1266 d->priority = pn->priority;
1267
1268 d->mtu = btohs(pn->mtu);
1269
1270 if (cr && d->mtu > s->mtu)
1271 d->mtu = s->mtu;
1272
1273 return 0;
1274 }
1275
1276 static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1277 {
1278 struct rfcomm_pn *pn = (void *) skb->data;
1279 struct rfcomm_dlc *d;
1280 u8 dlci = pn->dlci;
1281
1282 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1283
1284 if (!dlci)
1285 return 0;
1286
1287 d = rfcomm_dlc_get(s, dlci);
1288 if (d) {
1289 if (cr) {
1290 /* PN request */
1291 rfcomm_apply_pn(d, cr, pn);
1292 rfcomm_send_pn(s, 0, d);
1293 } else {
1294 /* PN response */
1295 switch (d->state) {
1296 case BT_CONFIG:
1297 rfcomm_apply_pn(d, cr, pn);
1298
1299 d->state = BT_CONNECT;
1300 rfcomm_send_sabm(s, d->dlci);
1301 break;
1302 }
1303 }
1304 } else {
1305 u8 channel = __srv_channel(dlci);
1306
1307 if (!cr)
1308 return 0;
1309
1310 /* PN request for non existing DLC.
1311 * Assume incoming connection. */
1312 if (rfcomm_connect_ind(s, channel, &d)) {
1313 d->dlci = dlci;
1314 d->addr = __addr(s->initiator, dlci);
1315 rfcomm_dlc_link(s, d);
1316
1317 rfcomm_apply_pn(d, cr, pn);
1318
1319 d->state = BT_OPEN;
1320 rfcomm_send_pn(s, 0, d);
1321 } else {
1322 rfcomm_send_dm(s, dlci);
1323 }
1324 }
1325 return 0;
1326 }
1327
1328 static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb)
1329 {
1330 struct rfcomm_rpn *rpn = (void *) skb->data;
1331 u8 dlci = __get_dlci(rpn->dlci);
1332
1333 u8 bit_rate = 0;
1334 u8 data_bits = 0;
1335 u8 stop_bits = 0;
1336 u8 parity = 0;
1337 u8 flow_ctrl = 0;
1338 u8 xon_char = 0;
1339 u8 xoff_char = 0;
1340 u16 rpn_mask = RFCOMM_RPN_PM_ALL;
1341
1342 BT_DBG("dlci %d cr %d len 0x%x bitr 0x%x line 0x%x flow 0x%x xonc 0x%x xoffc 0x%x pm 0x%x",
1343 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl,
1344 rpn->xon_char, rpn->xoff_char, rpn->param_mask);
1345
1346 if (!cr)
1347 return 0;
1348
1349 if (len == 1) {
1350 /* This is a request, return default settings */
1351 bit_rate = RFCOMM_RPN_BR_115200;
1352 data_bits = RFCOMM_RPN_DATA_8;
1353 stop_bits = RFCOMM_RPN_STOP_1;
1354 parity = RFCOMM_RPN_PARITY_NONE;
1355 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1356 xon_char = RFCOMM_RPN_XON_CHAR;
1357 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1358 goto rpn_out;
1359 }
1360
1361 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
1362 * no parity, no flow control lines, normal XON/XOFF chars */
1363
1364 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
1365 bit_rate = rpn->bit_rate;
1366 if (bit_rate != RFCOMM_RPN_BR_115200) {
1367 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
1368 bit_rate = RFCOMM_RPN_BR_115200;
1369 rpn_mask ^= RFCOMM_RPN_PM_BITRATE;
1370 }
1371 }
1372
1373 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
1374 data_bits = __get_rpn_data_bits(rpn->line_settings);
1375 if (data_bits != RFCOMM_RPN_DATA_8) {
1376 BT_DBG("RPN data bits mismatch 0x%x", data_bits);
1377 data_bits = RFCOMM_RPN_DATA_8;
1378 rpn_mask ^= RFCOMM_RPN_PM_DATA;
1379 }
1380 }
1381
1382 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
1383 stop_bits = __get_rpn_stop_bits(rpn->line_settings);
1384 if (stop_bits != RFCOMM_RPN_STOP_1) {
1385 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits);
1386 stop_bits = RFCOMM_RPN_STOP_1;
1387 rpn_mask ^= RFCOMM_RPN_PM_STOP;
1388 }
1389 }
1390
1391 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
1392 parity = __get_rpn_parity(rpn->line_settings);
1393 if (parity != RFCOMM_RPN_PARITY_NONE) {
1394 BT_DBG("RPN parity mismatch 0x%x", parity);
1395 parity = RFCOMM_RPN_PARITY_NONE;
1396 rpn_mask ^= RFCOMM_RPN_PM_PARITY;
1397 }
1398 }
1399
1400 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
1401 flow_ctrl = rpn->flow_ctrl;
1402 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
1403 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl);
1404 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1405 rpn_mask ^= RFCOMM_RPN_PM_FLOW;
1406 }
1407 }
1408
1409 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
1410 xon_char = rpn->xon_char;
1411 if (xon_char != RFCOMM_RPN_XON_CHAR) {
1412 BT_DBG("RPN XON char mismatch 0x%x", xon_char);
1413 xon_char = RFCOMM_RPN_XON_CHAR;
1414 rpn_mask ^= RFCOMM_RPN_PM_XON;
1415 }
1416 }
1417
1418 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
1419 xoff_char = rpn->xoff_char;
1420 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
1421 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char);
1422 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1423 rpn_mask ^= RFCOMM_RPN_PM_XOFF;
1424 }
1425 }
1426
1427 rpn_out:
1428 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
1429 parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
1430
1431 return 0;
1432 }
1433
1434 static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1435 {
1436 struct rfcomm_rls *rls = (void *) skb->data;
1437 u8 dlci = __get_dlci(rls->dlci);
1438
1439 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status);
1440
1441 if (!cr)
1442 return 0;
1443
1444 /* We should probably do something with this information here. But
1445 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's
1446 * mandatory to recognise and respond to RLS */
1447
1448 rfcomm_send_rls(s, 0, dlci, rls->status);
1449
1450 return 0;
1451 }
1452
1453 static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1454 {
1455 struct rfcomm_msc *msc = (void *) skb->data;
1456 struct rfcomm_dlc *d;
1457 u8 dlci = __get_dlci(msc->dlci);
1458
1459 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig);
1460
1461 d = rfcomm_dlc_get(s, dlci);
1462 if (!d)
1463 return 0;
1464
1465 if (cr) {
1466 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
1467 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1468 else
1469 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1470
1471 rfcomm_dlc_lock(d);
1472
1473 d->remote_v24_sig = msc->v24_sig;
1474
1475 if (d->modem_status)
1476 d->modem_status(d, msc->v24_sig);
1477
1478 rfcomm_dlc_unlock(d);
1479
1480 rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
1481
1482 d->mscex |= RFCOMM_MSCEX_RX;
1483 } else
1484 d->mscex |= RFCOMM_MSCEX_TX;
1485
1486 return 0;
1487 }
1488
1489 static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb)
1490 {
1491 struct rfcomm_mcc *mcc = (void *) skb->data;
1492 u8 type, cr, len;
1493
1494 cr = __test_cr(mcc->type);
1495 type = __get_mcc_type(mcc->type);
1496 len = __get_mcc_len(mcc->len);
1497
1498 BT_DBG("%p type 0x%x cr %d", s, type, cr);
1499
1500 skb_pull(skb, 2);
1501
1502 switch (type) {
1503 case RFCOMM_PN:
1504 rfcomm_recv_pn(s, cr, skb);
1505 break;
1506
1507 case RFCOMM_RPN:
1508 rfcomm_recv_rpn(s, cr, len, skb);
1509 break;
1510
1511 case RFCOMM_RLS:
1512 rfcomm_recv_rls(s, cr, skb);
1513 break;
1514
1515 case RFCOMM_MSC:
1516 rfcomm_recv_msc(s, cr, skb);
1517 break;
1518
1519 case RFCOMM_FCOFF:
1520 if (cr) {
1521 set_bit(RFCOMM_TX_THROTTLED, &s->flags);
1522 rfcomm_send_fcoff(s, 0);
1523 }
1524 break;
1525
1526 case RFCOMM_FCON:
1527 if (cr) {
1528 clear_bit(RFCOMM_TX_THROTTLED, &s->flags);
1529 rfcomm_send_fcon(s, 0);
1530 }
1531 break;
1532
1533 case RFCOMM_TEST:
1534 if (cr)
1535 rfcomm_send_test(s, 0, skb->data, skb->len);
1536 break;
1537
1538 case RFCOMM_NSC:
1539 break;
1540
1541 default:
1542 BT_ERR("Unknown control type 0x%02x", type);
1543 rfcomm_send_nsc(s, cr, type);
1544 break;
1545 }
1546 return 0;
1547 }
1548
1549 static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb)
1550 {
1551 struct rfcomm_dlc *d;
1552
1553 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf);
1554
1555 d = rfcomm_dlc_get(s, dlci);
1556 if (!d) {
1557 rfcomm_send_dm(s, dlci);
1558 goto drop;
1559 }
1560
1561 if (pf && d->cfc) {
1562 u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);
1563
1564 d->tx_credits += credits;
1565 if (d->tx_credits)
1566 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1567 }
1568
1569 if (skb->len && d->state == BT_CONNECTED) {
1570 rfcomm_dlc_lock(d);
1571 d->rx_credits--;
1572 d->data_ready(d, skb);
1573 rfcomm_dlc_unlock(d);
1574 return 0;
1575 }
1576
1577 drop:
1578 kfree_skb(skb);
1579 return 0;
1580 }
1581
1582 static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb)
1583 {
1584 struct rfcomm_hdr *hdr = (void *) skb->data;
1585 u8 type, dlci, fcs;
1586
1587 dlci = __get_dlci(hdr->addr);
1588 type = __get_type(hdr->ctrl);
1589
1590 /* Trim FCS */
1591 skb->len--; skb->tail--;
1592 fcs = *(u8 *)skb_tail_pointer(skb);
1593
1594 if (__check_fcs(skb->data, type, fcs)) {
1595 BT_ERR("bad checksum in packet");
1596 kfree_skb(skb);
1597 return -EILSEQ;
1598 }
1599
1600 if (__test_ea(hdr->len))
1601 skb_pull(skb, 3);
1602 else
1603 skb_pull(skb, 4);
1604
1605 switch (type) {
1606 case RFCOMM_SABM:
1607 if (__test_pf(hdr->ctrl))
1608 rfcomm_recv_sabm(s, dlci);
1609 break;
1610
1611 case RFCOMM_DISC:
1612 if (__test_pf(hdr->ctrl))
1613 rfcomm_recv_disc(s, dlci);
1614 break;
1615
1616 case RFCOMM_UA:
1617 if (__test_pf(hdr->ctrl))
1618 rfcomm_recv_ua(s, dlci);
1619 break;
1620
1621 case RFCOMM_DM:
1622 rfcomm_recv_dm(s, dlci);
1623 break;
1624
1625 case RFCOMM_UIH:
1626 if (dlci)
1627 return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
1628
1629 rfcomm_recv_mcc(s, skb);
1630 break;
1631
1632 default:
1633 BT_ERR("Unknown packet type 0x%02x\n", type);
1634 break;
1635 }
1636 kfree_skb(skb);
1637 return 0;
1638 }
1639
1640 /* ---- Connection and data processing ---- */
1641
1642 static void rfcomm_process_connect(struct rfcomm_session *s)
1643 {
1644 struct rfcomm_dlc *d;
1645 struct list_head *p, *n;
1646
1647 BT_DBG("session %p state %ld", s, s->state);
1648
1649 list_for_each_safe(p, n, &s->dlcs) {
1650 d = list_entry(p, struct rfcomm_dlc, list);
1651 if (d->state == BT_CONFIG) {
1652 d->mtu = s->mtu;
1653 if (rfcomm_check_security(d)) {
1654 rfcomm_send_pn(s, 1, d);
1655 } else {
1656 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1657 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1658 }
1659 }
1660 }
1661 }
1662
1663 /* Send data queued for the DLC.
1664 * Return number of frames left in the queue.
1665 */
1666 static inline int rfcomm_process_tx(struct rfcomm_dlc *d)
1667 {
1668 struct sk_buff *skb;
1669 int err;
1670
1671 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
1672 d, d->state, d->cfc, d->rx_credits, d->tx_credits);
1673
1674 /* Send pending MSC */
1675 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
1676 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1677
1678 if (d->cfc) {
1679 /* CFC enabled.
1680 * Give them some credits */
1681 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
1682 d->rx_credits <= (d->cfc >> 2)) {
1683 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits);
1684 d->rx_credits = d->cfc;
1685 }
1686 } else {
1687 /* CFC disabled.
1688 * Give ourselves some credits */
1689 d->tx_credits = 5;
1690 }
1691
1692 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags))
1693 return skb_queue_len(&d->tx_queue);
1694
1695 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) {
1696 err = rfcomm_send_frame(d->session, skb->data, skb->len);
1697 if (err < 0) {
1698 skb_queue_head(&d->tx_queue, skb);
1699 break;
1700 }
1701 kfree_skb(skb);
1702 d->tx_credits--;
1703 }
1704
1705 if (d->cfc && !d->tx_credits) {
1706 /* We're out of TX credits.
1707 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
1708 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1709 }
1710
1711 return skb_queue_len(&d->tx_queue);
1712 }
1713
1714 static inline void rfcomm_process_dlcs(struct rfcomm_session *s)
1715 {
1716 struct rfcomm_dlc *d;
1717 struct list_head *p, *n;
1718
1719 BT_DBG("session %p state %ld", s, s->state);
1720
1721 list_for_each_safe(p, n, &s->dlcs) {
1722 d = list_entry(p, struct rfcomm_dlc, list);
1723
1724 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
1725 __rfcomm_dlc_close(d, ETIMEDOUT);
1726 continue;
1727 }
1728
1729 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) {
1730 rfcomm_dlc_clear_timer(d);
1731 if (d->out) {
1732 rfcomm_send_pn(s, 1, d);
1733 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
1734 } else {
1735 if (d->defer_setup) {
1736 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1737 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1738 } else
1739 rfcomm_dlc_accept(d);
1740 }
1741 continue;
1742 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
1743 rfcomm_dlc_clear_timer(d);
1744 if (!d->out)
1745 rfcomm_send_dm(s, d->dlci);
1746 else
1747 d->state = BT_CLOSED;
1748 __rfcomm_dlc_close(d, ECONNREFUSED);
1749 continue;
1750 }
1751
1752 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
1753 continue;
1754
1755 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
1756 d->mscex == RFCOMM_MSCEX_OK)
1757 rfcomm_process_tx(d);
1758 }
1759 }
1760
1761 static inline void rfcomm_process_rx(struct rfcomm_session *s)
1762 {
1763 struct socket *sock = s->sock;
1764 struct sock *sk = sock->sk;
1765 struct sk_buff *skb;
1766
1767 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue));
1768
1769 /* Get data directly from socket receive queue without copying it. */
1770 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
1771 skb_orphan(skb);
1772 rfcomm_recv_frame(s, skb);
1773 }
1774
1775 if (sk->sk_state == BT_CLOSED) {
1776 if (!s->initiator)
1777 rfcomm_session_put(s);
1778
1779 rfcomm_session_close(s, sk->sk_err);
1780 }
1781 }
1782
1783 static inline void rfcomm_accept_connection(struct rfcomm_session *s)
1784 {
1785 struct socket *sock = s->sock, *nsock;
1786 int err;
1787
1788 /* Fast check for a new connection.
1789 * Avoids unnesesary socket allocations. */
1790 if (list_empty(&bt_sk(sock->sk)->accept_q))
1791 return;
1792
1793 BT_DBG("session %p", s);
1794
1795 err = kernel_accept(sock, &nsock, O_NONBLOCK);
1796 if (err < 0)
1797 return;
1798
1799 /* Set our callbacks */
1800 nsock->sk->sk_data_ready = rfcomm_l2data_ready;
1801 nsock->sk->sk_state_change = rfcomm_l2state_change;
1802
1803 s = rfcomm_session_add(nsock, BT_OPEN);
1804 if (s) {
1805 rfcomm_session_hold(s);
1806
1807 /* We should adjust MTU on incoming sessions.
1808 * L2CAP MTU minus UIH header and FCS. */
1809 s->mtu = min(l2cap_pi(nsock->sk)->omtu, l2cap_pi(nsock->sk)->imtu) - 5;
1810
1811 rfcomm_schedule(RFCOMM_SCHED_RX);
1812 } else
1813 sock_release(nsock);
1814 }
1815
1816 static inline void rfcomm_check_connection(struct rfcomm_session *s)
1817 {
1818 struct sock *sk = s->sock->sk;
1819
1820 BT_DBG("%p state %ld", s, s->state);
1821
1822 switch(sk->sk_state) {
1823 case BT_CONNECTED:
1824 s->state = BT_CONNECT;
1825
1826 /* We can adjust MTU on outgoing sessions.
1827 * L2CAP MTU minus UIH header and FCS. */
1828 s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5;
1829
1830 rfcomm_send_sabm(s, 0);
1831 break;
1832
1833 case BT_CLOSED:
1834 s->state = BT_CLOSED;
1835 rfcomm_session_close(s, sk->sk_err);
1836 break;
1837 }
1838 }
1839
1840 static inline void rfcomm_process_sessions(void)
1841 {
1842 struct list_head *p, *n;
1843
1844 rfcomm_lock();
1845
1846 list_for_each_safe(p, n, &session_list) {
1847 struct rfcomm_session *s;
1848 s = list_entry(p, struct rfcomm_session, list);
1849
1850 if (s->state == BT_LISTEN) {
1851 rfcomm_accept_connection(s);
1852 continue;
1853 }
1854
1855 rfcomm_session_hold(s);
1856
1857 switch (s->state) {
1858 case BT_BOUND:
1859 rfcomm_check_connection(s);
1860 break;
1861
1862 default:
1863 rfcomm_process_rx(s);
1864 break;
1865 }
1866
1867 rfcomm_process_dlcs(s);
1868
1869 rfcomm_session_put(s);
1870 }
1871
1872 rfcomm_unlock();
1873 }
1874
1875 static int rfcomm_add_listener(bdaddr_t *ba)
1876 {
1877 struct sockaddr_l2 addr;
1878 struct socket *sock;
1879 struct sock *sk;
1880 struct rfcomm_session *s;
1881 int err = 0;
1882
1883 /* Create socket */
1884 err = rfcomm_l2sock_create(&sock);
1885 if (err < 0) {
1886 BT_ERR("Create socket failed %d", err);
1887 return err;
1888 }
1889
1890 /* Bind socket */
1891 bacpy(&addr.l2_bdaddr, ba);
1892 addr.l2_family = AF_BLUETOOTH;
1893 addr.l2_psm = htobs(RFCOMM_PSM);
1894 err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
1895 if (err < 0) {
1896 BT_ERR("Bind failed %d", err);
1897 goto failed;
1898 }
1899
1900 /* Set L2CAP options */
1901 sk = sock->sk;
1902 lock_sock(sk);
1903 l2cap_pi(sk)->imtu = l2cap_mtu;
1904 release_sock(sk);
1905
1906 /* Start listening on the socket */
1907 err = kernel_listen(sock, 10);
1908 if (err) {
1909 BT_ERR("Listen failed %d", err);
1910 goto failed;
1911 }
1912
1913 /* Add listening session */
1914 s = rfcomm_session_add(sock, BT_LISTEN);
1915 if (!s)
1916 goto failed;
1917
1918 rfcomm_session_hold(s);
1919 return 0;
1920 failed:
1921 sock_release(sock);
1922 return err;
1923 }
1924
1925 static void rfcomm_kill_listener(void)
1926 {
1927 struct rfcomm_session *s;
1928 struct list_head *p, *n;
1929
1930 BT_DBG("");
1931
1932 list_for_each_safe(p, n, &session_list) {
1933 s = list_entry(p, struct rfcomm_session, list);
1934 rfcomm_session_del(s);
1935 }
1936 }
1937
1938 static int rfcomm_run(void *unused)
1939 {
1940 BT_DBG("");
1941
1942 set_user_nice(current, -10);
1943
1944 rfcomm_add_listener(BDADDR_ANY);
1945
1946 while (!kthread_should_stop()) {
1947 set_current_state(TASK_INTERRUPTIBLE);
1948 if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) {
1949 /* No pending events. Let's sleep.
1950 * Incoming connections and data will wake us up. */
1951 schedule();
1952 }
1953 set_current_state(TASK_RUNNING);
1954
1955 /* Process stuff */
1956 clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
1957 rfcomm_process_sessions();
1958 }
1959
1960 rfcomm_kill_listener();
1961
1962 return 0;
1963 }
1964
1965 static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
1966 {
1967 struct rfcomm_session *s;
1968 struct rfcomm_dlc *d;
1969 struct list_head *p, *n;
1970
1971 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);
1972
1973 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
1974 if (!s)
1975 return;
1976
1977 rfcomm_session_hold(s);
1978
1979 list_for_each_safe(p, n, &s->dlcs) {
1980 d = list_entry(p, struct rfcomm_dlc, list);
1981
1982 if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) {
1983 rfcomm_dlc_clear_timer(d);
1984 if (status || encrypt == 0x00) {
1985 __rfcomm_dlc_close(d, ECONNREFUSED);
1986 continue;
1987 }
1988 }
1989
1990 if (d->state == BT_CONNECTED && !status && encrypt == 0x00) {
1991 if (d->sec_level == BT_SECURITY_MEDIUM) {
1992 set_bit(RFCOMM_SEC_PENDING, &d->flags);
1993 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1994 continue;
1995 } else if (d->sec_level == BT_SECURITY_HIGH) {
1996 __rfcomm_dlc_close(d, ECONNREFUSED);
1997 continue;
1998 }
1999 }
2000
2001 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
2002 continue;
2003
2004 if (!status)
2005 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
2006 else
2007 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
2008 }
2009
2010 rfcomm_session_put(s);
2011
2012 rfcomm_schedule(RFCOMM_SCHED_AUTH);
2013 }
2014
2015 static struct hci_cb rfcomm_cb = {
2016 .name = "RFCOMM",
2017 .security_cfm = rfcomm_security_cfm
2018 };
2019
2020 static ssize_t rfcomm_dlc_sysfs_show(struct class *dev, char *buf)
2021 {
2022 struct rfcomm_session *s;
2023 struct list_head *pp, *p;
2024 char *str = buf;
2025
2026 rfcomm_lock();
2027
2028 list_for_each(p, &session_list) {
2029 s = list_entry(p, struct rfcomm_session, list);
2030 list_for_each(pp, &s->dlcs) {
2031 struct sock *sk = s->sock->sk;
2032 struct rfcomm_dlc *d = list_entry(pp, struct rfcomm_dlc, list);
2033
2034 str += sprintf(str, "%s %s %ld %d %d %d %d\n",
2035 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
2036 d->state, d->dlci, d->mtu, d->rx_credits, d->tx_credits);
2037 }
2038 }
2039
2040 rfcomm_unlock();
2041
2042 return (str - buf);
2043 }
2044
2045 static CLASS_ATTR(rfcomm_dlc, S_IRUGO, rfcomm_dlc_sysfs_show, NULL);
2046
2047 /* ---- Initialization ---- */
2048 static int __init rfcomm_init(void)
2049 {
2050 l2cap_load();
2051
2052 hci_register_cb(&rfcomm_cb);
2053
2054 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
2055 if (IS_ERR(rfcomm_thread)) {
2056 hci_unregister_cb(&rfcomm_cb);
2057 return PTR_ERR(rfcomm_thread);
2058 }
2059
2060 if (class_create_file(bt_class, &class_attr_rfcomm_dlc) < 0)
2061 BT_ERR("Failed to create RFCOMM info file");
2062
2063 rfcomm_init_sockets();
2064
2065 #ifdef CONFIG_BT_RFCOMM_TTY
2066 rfcomm_init_ttys();
2067 #endif
2068
2069 BT_INFO("RFCOMM ver %s", VERSION);
2070
2071 return 0;
2072 }
2073
2074 static void __exit rfcomm_exit(void)
2075 {
2076 class_remove_file(bt_class, &class_attr_rfcomm_dlc);
2077
2078 hci_unregister_cb(&rfcomm_cb);
2079
2080 kthread_stop(rfcomm_thread);
2081
2082 #ifdef CONFIG_BT_RFCOMM_TTY
2083 rfcomm_cleanup_ttys();
2084 #endif
2085
2086 rfcomm_cleanup_sockets();
2087 }
2088
2089 module_init(rfcomm_init);
2090 module_exit(rfcomm_exit);
2091
2092 module_param(disable_cfc, bool, 0644);
2093 MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
2094
2095 module_param(channel_mtu, int, 0644);
2096 MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
2097
2098 module_param(l2cap_mtu, uint, 0644);
2099 MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");
2100
2101 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
2102 MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
2103 MODULE_VERSION(VERSION);
2104 MODULE_LICENSE("GPL");
2105 MODULE_ALIAS("bt-proto-3");
kernel source for telekom puls (alcatel/mediatek)