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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 * Bluetooth RFCOMM core.
26 *
27 * $Id: core.c,v 1.42 2002/10/01 23:26:25 maxk Exp $
28 */
29
30 #include <linux/module.h>
31 #include <linux/errno.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/signal.h>
35 #include <linux/init.h>
36 #include <linux/wait.h>
37 #include <linux/device.h>
38 #include <linux/net.h>
39 #include <linux/mutex.h>
40 #include <linux/kthread.h>
41
42 #include <net/sock.h>
43 #include <asm/uaccess.h>
44 #include <asm/unaligned.h>
45
46 #include <net/bluetooth/bluetooth.h>
47 #include <net/bluetooth/hci_core.h>
48 #include <net/bluetooth/l2cap.h>
49 #include <net/bluetooth/rfcomm.h>
50
51 #ifndef CONFIG_BT_RFCOMM_DEBUG
52 #undef BT_DBG
53 #define BT_DBG(D...)
54 #endif
55
56 #define VERSION "1.9"
57
58 static int disable_cfc = 0;
59 static int channel_mtu = -1;
60 static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
61
62 static struct task_struct *rfcomm_thread;
63
64 static DEFINE_MUTEX(rfcomm_mutex);
65 #define rfcomm_lock() mutex_lock(&rfcomm_mutex)
66 #define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
67
68 static unsigned long rfcomm_event;
69
70 static LIST_HEAD(session_list);
71
72 static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
73 static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
74 static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
75 static int rfcomm_queue_disc(struct rfcomm_dlc *d);
76 static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
77 static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
78 static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
79 static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
80 static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
81 static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
82
83 static void rfcomm_process_connect(struct rfcomm_session *s);
84
85 static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err);
86 static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
87 static void rfcomm_session_del(struct rfcomm_session *s);
88
89 /* ---- RFCOMM frame parsing macros ---- */
90 #define __get_dlci(b) ((b & 0xfc) >> 2)
91 #define __get_channel(b) ((b & 0xf8) >> 3)
92 #define __get_dir(b) ((b & 0x04) >> 2)
93 #define __get_type(b) ((b & 0xef))
94
95 #define __test_ea(b) ((b & 0x01))
96 #define __test_cr(b) ((b & 0x02))
97 #define __test_pf(b) ((b & 0x10))
98
99 #define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
100 #define __ctrl(type, pf) (((type & 0xef) | (pf << 4)))
101 #define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir)
102 #define __srv_channel(dlci) (dlci >> 1)
103 #define __dir(dlci) (dlci & 0x01)
104
105 #define __len8(len) (((len) << 1) | 1)
106 #define __len16(len) ((len) << 1)
107
108 /* MCC macros */
109 #define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01))
110 #define __get_mcc_type(b) ((b & 0xfc) >> 2)
111 #define __get_mcc_len(b) ((b & 0xfe) >> 1)
112
113 /* RPN macros */
114 #define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
115 #define __get_rpn_data_bits(line) ((line) & 0x3)
116 #define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
117 #define __get_rpn_parity(line) (((line) >> 3) & 0x7)
118
119 static inline void rfcomm_schedule(uint event)
120 {
121 if (!rfcomm_thread)
122 return;
123 //set_bit(event, &rfcomm_event);
124 set_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
125 wake_up_process(rfcomm_thread);
126 }
127
128 static inline void rfcomm_session_put(struct rfcomm_session *s)
129 {
130 if (atomic_dec_and_test(&s->refcnt))
131 rfcomm_session_del(s);
132 }
133
134 /* ---- RFCOMM FCS computation ---- */
135
136 /* reversed, 8-bit, poly=0x07 */
137 static unsigned char rfcomm_crc_table[256] = {
138 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
139 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
140 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
141 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
142
143 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
144 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
145 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
146 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
147
148 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
149 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
150 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
151 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
152
153 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
154 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
155 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
156 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
157
158 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
159 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
160 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
161 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
162
163 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
164 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
165 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
166 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
167
168 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
169 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
170 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
171 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
172
173 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
174 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
175 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
176 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
177 };
178
179 /* CRC on 2 bytes */
180 #define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
181
182 /* FCS on 2 bytes */
183 static inline u8 __fcs(u8 *data)
184 {
185 return (0xff - __crc(data));
186 }
187
188 /* FCS on 3 bytes */
189 static inline u8 __fcs2(u8 *data)
190 {
191 return (0xff - rfcomm_crc_table[__crc(data) ^ data[2]]);
192 }
193
194 /* Check FCS */
195 static inline int __check_fcs(u8 *data, int type, u8 fcs)
196 {
197 u8 f = __crc(data);
198
199 if (type != RFCOMM_UIH)
200 f = rfcomm_crc_table[f ^ data[2]];
201
202 return rfcomm_crc_table[f ^ fcs] != 0xcf;
203 }
204
205 /* ---- L2CAP callbacks ---- */
206 static void rfcomm_l2state_change(struct sock *sk)
207 {
208 BT_DBG("%p state %d", sk, sk->sk_state);
209 rfcomm_schedule(RFCOMM_SCHED_STATE);
210 }
211
212 static void rfcomm_l2data_ready(struct sock *sk, int bytes)
213 {
214 BT_DBG("%p bytes %d", sk, bytes);
215 rfcomm_schedule(RFCOMM_SCHED_RX);
216 }
217
218 static int rfcomm_l2sock_create(struct socket **sock)
219 {
220 int err;
221
222 BT_DBG("");
223
224 err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
225 if (!err) {
226 struct sock *sk = (*sock)->sk;
227 sk->sk_data_ready = rfcomm_l2data_ready;
228 sk->sk_state_change = rfcomm_l2state_change;
229 }
230 return err;
231 }
232
233 static inline int rfcomm_check_link_mode(struct rfcomm_dlc *d)
234 {
235 struct sock *sk = d->session->sock->sk;
236
237 if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) {
238 if (!hci_conn_encrypt(l2cap_pi(sk)->conn->hcon))
239 return 1;
240 } else if (d->link_mode & RFCOMM_LM_AUTH) {
241 if (!hci_conn_auth(l2cap_pi(sk)->conn->hcon))
242 return 1;
243 }
244
245 return 0;
246 }
247
248 /* ---- RFCOMM DLCs ---- */
249 static void rfcomm_dlc_timeout(unsigned long arg)
250 {
251 struct rfcomm_dlc *d = (void *) arg;
252
253 BT_DBG("dlc %p state %ld", d, d->state);
254
255 set_bit(RFCOMM_TIMED_OUT, &d->flags);
256 rfcomm_dlc_put(d);
257 rfcomm_schedule(RFCOMM_SCHED_TIMEO);
258 }
259
260 static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
261 {
262 BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);
263
264 if (!mod_timer(&d->timer, jiffies + timeout))
265 rfcomm_dlc_hold(d);
266 }
267
268 static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
269 {
270 BT_DBG("dlc %p state %ld", d, d->state);
271
272 if (timer_pending(&d->timer) && del_timer(&d->timer))
273 rfcomm_dlc_put(d);
274 }
275
276 static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
277 {
278 BT_DBG("%p", d);
279
280 d->state = BT_OPEN;
281 d->flags = 0;
282 d->mscex = 0;
283 d->mtu = RFCOMM_DEFAULT_MTU;
284 d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV;
285
286 d->cfc = RFCOMM_CFC_DISABLED;
287 d->rx_credits = RFCOMM_DEFAULT_CREDITS;
288 }
289
290 struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
291 {
292 struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);
293
294 if (!d)
295 return NULL;
296
297 setup_timer(&d->timer, rfcomm_dlc_timeout, (unsigned long)d);
298
299 skb_queue_head_init(&d->tx_queue);
300 spin_lock_init(&d->lock);
301 atomic_set(&d->refcnt, 1);
302
303 rfcomm_dlc_clear_state(d);
304
305 BT_DBG("%p", d);
306
307 return d;
308 }
309
310 void rfcomm_dlc_free(struct rfcomm_dlc *d)
311 {
312 BT_DBG("%p", d);
313
314 skb_queue_purge(&d->tx_queue);
315 kfree(d);
316 }
317
318 static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
319 {
320 BT_DBG("dlc %p session %p", d, s);
321
322 rfcomm_session_hold(s);
323
324 rfcomm_dlc_hold(d);
325 list_add(&d->list, &s->dlcs);
326 d->session = s;
327 }
328
329 static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
330 {
331 struct rfcomm_session *s = d->session;
332
333 BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s);
334
335 list_del(&d->list);
336 d->session = NULL;
337 rfcomm_dlc_put(d);
338
339 rfcomm_session_put(s);
340 }
341
342 static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
343 {
344 struct rfcomm_dlc *d;
345 struct list_head *p;
346
347 list_for_each(p, &s->dlcs) {
348 d = list_entry(p, struct rfcomm_dlc, list);
349 if (d->dlci == dlci)
350 return d;
351 }
352 return NULL;
353 }
354
355 static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
356 {
357 struct rfcomm_session *s;
358 int err = 0;
359 u8 dlci;
360
361 BT_DBG("dlc %p state %ld %s %s channel %d",
362 d, d->state, batostr(src), batostr(dst), channel);
363
364 if (channel < 1 || channel > 30)
365 return -EINVAL;
366
367 if (d->state != BT_OPEN && d->state != BT_CLOSED)
368 return 0;
369
370 s = rfcomm_session_get(src, dst);
371 if (!s) {
372 s = rfcomm_session_create(src, dst, &err);
373 if (!s)
374 return err;
375 }
376
377 dlci = __dlci(!s->initiator, channel);
378
379 /* Check if DLCI already exists */
380 if (rfcomm_dlc_get(s, dlci))
381 return -EBUSY;
382
383 rfcomm_dlc_clear_state(d);
384
385 d->dlci = dlci;
386 d->addr = __addr(s->initiator, dlci);
387 d->priority = 7;
388
389 d->state = BT_CONFIG;
390 rfcomm_dlc_link(s, d);
391
392 d->out = 1;
393
394 d->mtu = s->mtu;
395 d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;
396
397 if (s->state == BT_CONNECTED) {
398 if (rfcomm_check_link_mode(d))
399 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
400 else
401 rfcomm_send_pn(s, 1, d);
402 }
403
404 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
405
406 return 0;
407 }
408
409 int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
410 {
411 int r;
412
413 rfcomm_lock();
414
415 r = __rfcomm_dlc_open(d, src, dst, channel);
416
417 rfcomm_unlock();
418 return r;
419 }
420
421 static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
422 {
423 struct rfcomm_session *s = d->session;
424 if (!s)
425 return 0;
426
427 BT_DBG("dlc %p state %ld dlci %d err %d session %p",
428 d, d->state, d->dlci, err, s);
429
430 switch (d->state) {
431 case BT_CONNECTED:
432 case BT_CONFIG:
433 case BT_CONNECT:
434 d->state = BT_DISCONN;
435 if (skb_queue_empty(&d->tx_queue)) {
436 rfcomm_send_disc(s, d->dlci);
437 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
438 } else {
439 rfcomm_queue_disc(d);
440 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
441 }
442 break;
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 static 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->link_mode & RFCOMM_LM_MASTER)
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 int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
1192 {
1193 struct rfcomm_dlc *d;
1194 u8 channel;
1195
1196 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1197
1198 if (!dlci) {
1199 rfcomm_send_ua(s, 0);
1200
1201 if (s->state == BT_OPEN) {
1202 s->state = BT_CONNECTED;
1203 rfcomm_process_connect(s);
1204 }
1205 return 0;
1206 }
1207
1208 /* Check if DLC exists */
1209 d = rfcomm_dlc_get(s, dlci);
1210 if (d) {
1211 if (d->state == BT_OPEN) {
1212 /* DLC was previously opened by PN request */
1213 if (rfcomm_check_link_mode(d)) {
1214 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1215 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1216 } else
1217 rfcomm_dlc_accept(d);
1218 }
1219 return 0;
1220 }
1221
1222 /* Notify socket layer about incoming connection */
1223 channel = __srv_channel(dlci);
1224 if (rfcomm_connect_ind(s, channel, &d)) {
1225 d->dlci = dlci;
1226 d->addr = __addr(s->initiator, dlci);
1227 rfcomm_dlc_link(s, d);
1228
1229 if (rfcomm_check_link_mode(d)) {
1230 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1231 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1232 } else
1233 rfcomm_dlc_accept(d);
1234 } else {
1235 rfcomm_send_dm(s, dlci);
1236 }
1237
1238 return 0;
1239 }
1240
1241 static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
1242 {
1243 struct rfcomm_session *s = d->session;
1244
1245 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
1246 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);
1247
1248 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
1249 pn->flow_ctrl == 0xe0) {
1250 d->cfc = RFCOMM_CFC_ENABLED;
1251 d->tx_credits = pn->credits;
1252 } else {
1253 d->cfc = RFCOMM_CFC_DISABLED;
1254 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1255 }
1256
1257 if (s->cfc == RFCOMM_CFC_UNKNOWN)
1258 s->cfc = d->cfc;
1259
1260 d->priority = pn->priority;
1261
1262 d->mtu = btohs(pn->mtu);
1263
1264 if (cr && d->mtu > s->mtu)
1265 d->mtu = s->mtu;
1266
1267 return 0;
1268 }
1269
1270 static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1271 {
1272 struct rfcomm_pn *pn = (void *) skb->data;
1273 struct rfcomm_dlc *d;
1274 u8 dlci = pn->dlci;
1275
1276 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1277
1278 if (!dlci)
1279 return 0;
1280
1281 d = rfcomm_dlc_get(s, dlci);
1282 if (d) {
1283 if (cr) {
1284 /* PN request */
1285 rfcomm_apply_pn(d, cr, pn);
1286 rfcomm_send_pn(s, 0, d);
1287 } else {
1288 /* PN response */
1289 switch (d->state) {
1290 case BT_CONFIG:
1291 rfcomm_apply_pn(d, cr, pn);
1292
1293 d->state = BT_CONNECT;
1294 rfcomm_send_sabm(s, d->dlci);
1295 break;
1296 }
1297 }
1298 } else {
1299 u8 channel = __srv_channel(dlci);
1300
1301 if (!cr)
1302 return 0;
1303
1304 /* PN request for non existing DLC.
1305 * Assume incoming connection. */
1306 if (rfcomm_connect_ind(s, channel, &d)) {
1307 d->dlci = dlci;
1308 d->addr = __addr(s->initiator, dlci);
1309 rfcomm_dlc_link(s, d);
1310
1311 rfcomm_apply_pn(d, cr, pn);
1312
1313 d->state = BT_OPEN;
1314 rfcomm_send_pn(s, 0, d);
1315 } else {
1316 rfcomm_send_dm(s, dlci);
1317 }
1318 }
1319 return 0;
1320 }
1321
1322 static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb)
1323 {
1324 struct rfcomm_rpn *rpn = (void *) skb->data;
1325 u8 dlci = __get_dlci(rpn->dlci);
1326
1327 u8 bit_rate = 0;
1328 u8 data_bits = 0;
1329 u8 stop_bits = 0;
1330 u8 parity = 0;
1331 u8 flow_ctrl = 0;
1332 u8 xon_char = 0;
1333 u8 xoff_char = 0;
1334 u16 rpn_mask = RFCOMM_RPN_PM_ALL;
1335
1336 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",
1337 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl,
1338 rpn->xon_char, rpn->xoff_char, rpn->param_mask);
1339
1340 if (!cr)
1341 return 0;
1342
1343 if (len == 1) {
1344 /* This is a request, return default settings */
1345 bit_rate = RFCOMM_RPN_BR_115200;
1346 data_bits = RFCOMM_RPN_DATA_8;
1347 stop_bits = RFCOMM_RPN_STOP_1;
1348 parity = RFCOMM_RPN_PARITY_NONE;
1349 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1350 xon_char = RFCOMM_RPN_XON_CHAR;
1351 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1352 goto rpn_out;
1353 }
1354
1355 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
1356 * no parity, no flow control lines, normal XON/XOFF chars */
1357
1358 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
1359 bit_rate = rpn->bit_rate;
1360 if (bit_rate != RFCOMM_RPN_BR_115200) {
1361 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
1362 bit_rate = RFCOMM_RPN_BR_115200;
1363 rpn_mask ^= RFCOMM_RPN_PM_BITRATE;
1364 }
1365 }
1366
1367 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
1368 data_bits = __get_rpn_data_bits(rpn->line_settings);
1369 if (data_bits != RFCOMM_RPN_DATA_8) {
1370 BT_DBG("RPN data bits mismatch 0x%x", data_bits);
1371 data_bits = RFCOMM_RPN_DATA_8;
1372 rpn_mask ^= RFCOMM_RPN_PM_DATA;
1373 }
1374 }
1375
1376 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
1377 stop_bits = __get_rpn_stop_bits(rpn->line_settings);
1378 if (stop_bits != RFCOMM_RPN_STOP_1) {
1379 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits);
1380 stop_bits = RFCOMM_RPN_STOP_1;
1381 rpn_mask ^= RFCOMM_RPN_PM_STOP;
1382 }
1383 }
1384
1385 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
1386 parity = __get_rpn_parity(rpn->line_settings);
1387 if (parity != RFCOMM_RPN_PARITY_NONE) {
1388 BT_DBG("RPN parity mismatch 0x%x", parity);
1389 parity = RFCOMM_RPN_PARITY_NONE;
1390 rpn_mask ^= RFCOMM_RPN_PM_PARITY;
1391 }
1392 }
1393
1394 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
1395 flow_ctrl = rpn->flow_ctrl;
1396 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
1397 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl);
1398 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1399 rpn_mask ^= RFCOMM_RPN_PM_FLOW;
1400 }
1401 }
1402
1403 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
1404 xon_char = rpn->xon_char;
1405 if (xon_char != RFCOMM_RPN_XON_CHAR) {
1406 BT_DBG("RPN XON char mismatch 0x%x", xon_char);
1407 xon_char = RFCOMM_RPN_XON_CHAR;
1408 rpn_mask ^= RFCOMM_RPN_PM_XON;
1409 }
1410 }
1411
1412 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
1413 xoff_char = rpn->xoff_char;
1414 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
1415 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char);
1416 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1417 rpn_mask ^= RFCOMM_RPN_PM_XOFF;
1418 }
1419 }
1420
1421 rpn_out:
1422 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
1423 parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
1424
1425 return 0;
1426 }
1427
1428 static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1429 {
1430 struct rfcomm_rls *rls = (void *) skb->data;
1431 u8 dlci = __get_dlci(rls->dlci);
1432
1433 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status);
1434
1435 if (!cr)
1436 return 0;
1437
1438 /* We should probably do something with this information here. But
1439 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's
1440 * mandatory to recognise and respond to RLS */
1441
1442 rfcomm_send_rls(s, 0, dlci, rls->status);
1443
1444 return 0;
1445 }
1446
1447 static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1448 {
1449 struct rfcomm_msc *msc = (void *) skb->data;
1450 struct rfcomm_dlc *d;
1451 u8 dlci = __get_dlci(msc->dlci);
1452
1453 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig);
1454
1455 d = rfcomm_dlc_get(s, dlci);
1456 if (!d)
1457 return 0;
1458
1459 if (cr) {
1460 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
1461 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1462 else
1463 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1464
1465 rfcomm_dlc_lock(d);
1466 if (d->modem_status)
1467 d->modem_status(d, msc->v24_sig);
1468 rfcomm_dlc_unlock(d);
1469
1470 rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
1471
1472 d->mscex |= RFCOMM_MSCEX_RX;
1473 } else
1474 d->mscex |= RFCOMM_MSCEX_TX;
1475
1476 return 0;
1477 }
1478
1479 static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb)
1480 {
1481 struct rfcomm_mcc *mcc = (void *) skb->data;
1482 u8 type, cr, len;
1483
1484 cr = __test_cr(mcc->type);
1485 type = __get_mcc_type(mcc->type);
1486 len = __get_mcc_len(mcc->len);
1487
1488 BT_DBG("%p type 0x%x cr %d", s, type, cr);
1489
1490 skb_pull(skb, 2);
1491
1492 switch (type) {
1493 case RFCOMM_PN:
1494 rfcomm_recv_pn(s, cr, skb);
1495 break;
1496
1497 case RFCOMM_RPN:
1498 rfcomm_recv_rpn(s, cr, len, skb);
1499 break;
1500
1501 case RFCOMM_RLS:
1502 rfcomm_recv_rls(s, cr, skb);
1503 break;
1504
1505 case RFCOMM_MSC:
1506 rfcomm_recv_msc(s, cr, skb);
1507 break;
1508
1509 case RFCOMM_FCOFF:
1510 if (cr) {
1511 set_bit(RFCOMM_TX_THROTTLED, &s->flags);
1512 rfcomm_send_fcoff(s, 0);
1513 }
1514 break;
1515
1516 case RFCOMM_FCON:
1517 if (cr) {
1518 clear_bit(RFCOMM_TX_THROTTLED, &s->flags);
1519 rfcomm_send_fcon(s, 0);
1520 }
1521 break;
1522
1523 case RFCOMM_TEST:
1524 if (cr)
1525 rfcomm_send_test(s, 0, skb->data, skb->len);
1526 break;
1527
1528 case RFCOMM_NSC:
1529 break;
1530
1531 default:
1532 BT_ERR("Unknown control type 0x%02x", type);
1533 rfcomm_send_nsc(s, cr, type);
1534 break;
1535 }
1536 return 0;
1537 }
1538
1539 static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb)
1540 {
1541 struct rfcomm_dlc *d;
1542
1543 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf);
1544
1545 d = rfcomm_dlc_get(s, dlci);
1546 if (!d) {
1547 rfcomm_send_dm(s, dlci);
1548 goto drop;
1549 }
1550
1551 if (pf && d->cfc) {
1552 u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);
1553
1554 d->tx_credits += credits;
1555 if (d->tx_credits)
1556 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1557 }
1558
1559 if (skb->len && d->state == BT_CONNECTED) {
1560 rfcomm_dlc_lock(d);
1561 d->rx_credits--;
1562 d->data_ready(d, skb);
1563 rfcomm_dlc_unlock(d);
1564 return 0;
1565 }
1566
1567 drop:
1568 kfree_skb(skb);
1569 return 0;
1570 }
1571
1572 static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb)
1573 {
1574 struct rfcomm_hdr *hdr = (void *) skb->data;
1575 u8 type, dlci, fcs;
1576
1577 dlci = __get_dlci(hdr->addr);
1578 type = __get_type(hdr->ctrl);
1579
1580 /* Trim FCS */
1581 skb->len--; skb->tail--;
1582 fcs = *(u8 *)skb_tail_pointer(skb);
1583
1584 if (__check_fcs(skb->data, type, fcs)) {
1585 BT_ERR("bad checksum in packet");
1586 kfree_skb(skb);
1587 return -EILSEQ;
1588 }
1589
1590 if (__test_ea(hdr->len))
1591 skb_pull(skb, 3);
1592 else
1593 skb_pull(skb, 4);
1594
1595 switch (type) {
1596 case RFCOMM_SABM:
1597 if (__test_pf(hdr->ctrl))
1598 rfcomm_recv_sabm(s, dlci);
1599 break;
1600
1601 case RFCOMM_DISC:
1602 if (__test_pf(hdr->ctrl))
1603 rfcomm_recv_disc(s, dlci);
1604 break;
1605
1606 case RFCOMM_UA:
1607 if (__test_pf(hdr->ctrl))
1608 rfcomm_recv_ua(s, dlci);
1609 break;
1610
1611 case RFCOMM_DM:
1612 rfcomm_recv_dm(s, dlci);
1613 break;
1614
1615 case RFCOMM_UIH:
1616 if (dlci)
1617 return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
1618
1619 rfcomm_recv_mcc(s, skb);
1620 break;
1621
1622 default:
1623 BT_ERR("Unknown packet type 0x%02x\n", type);
1624 break;
1625 }
1626 kfree_skb(skb);
1627 return 0;
1628 }
1629
1630 /* ---- Connection and data processing ---- */
1631
1632 static void rfcomm_process_connect(struct rfcomm_session *s)
1633 {
1634 struct rfcomm_dlc *d;
1635 struct list_head *p, *n;
1636
1637 BT_DBG("session %p state %ld", s, s->state);
1638
1639 list_for_each_safe(p, n, &s->dlcs) {
1640 d = list_entry(p, struct rfcomm_dlc, list);
1641 if (d->state == BT_CONFIG) {
1642 d->mtu = s->mtu;
1643 if (rfcomm_check_link_mode(d)) {
1644 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1645 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1646 } else
1647 rfcomm_send_pn(s, 1, d);
1648 }
1649 }
1650 }
1651
1652 /* Send data queued for the DLC.
1653 * Return number of frames left in the queue.
1654 */
1655 static inline int rfcomm_process_tx(struct rfcomm_dlc *d)
1656 {
1657 struct sk_buff *skb;
1658 int err;
1659
1660 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
1661 d, d->state, d->cfc, d->rx_credits, d->tx_credits);
1662
1663 /* Send pending MSC */
1664 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
1665 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1666
1667 if (d->cfc) {
1668 /* CFC enabled.
1669 * Give them some credits */
1670 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
1671 d->rx_credits <= (d->cfc >> 2)) {
1672 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits);
1673 d->rx_credits = d->cfc;
1674 }
1675 } else {
1676 /* CFC disabled.
1677 * Give ourselves some credits */
1678 d->tx_credits = 5;
1679 }
1680
1681 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags))
1682 return skb_queue_len(&d->tx_queue);
1683
1684 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) {
1685 err = rfcomm_send_frame(d->session, skb->data, skb->len);
1686 if (err < 0) {
1687 skb_queue_head(&d->tx_queue, skb);
1688 break;
1689 }
1690 kfree_skb(skb);
1691 d->tx_credits--;
1692 }
1693
1694 if (d->cfc && !d->tx_credits) {
1695 /* We're out of TX credits.
1696 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
1697 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1698 }
1699
1700 return skb_queue_len(&d->tx_queue);
1701 }
1702
1703 static inline void rfcomm_process_dlcs(struct rfcomm_session *s)
1704 {
1705 struct rfcomm_dlc *d;
1706 struct list_head *p, *n;
1707
1708 BT_DBG("session %p state %ld", s, s->state);
1709
1710 list_for_each_safe(p, n, &s->dlcs) {
1711 d = list_entry(p, struct rfcomm_dlc, list);
1712
1713 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
1714 __rfcomm_dlc_close(d, ETIMEDOUT);
1715 continue;
1716 }
1717
1718 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) {
1719 rfcomm_dlc_clear_timer(d);
1720 if (d->out) {
1721 rfcomm_send_pn(s, 1, d);
1722 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
1723 } else
1724 rfcomm_dlc_accept(d);
1725 if (d->link_mode & RFCOMM_LM_SECURE) {
1726 struct sock *sk = s->sock->sk;
1727 hci_conn_change_link_key(l2cap_pi(sk)->conn->hcon);
1728 }
1729 continue;
1730 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
1731 rfcomm_dlc_clear_timer(d);
1732 if (!d->out)
1733 rfcomm_send_dm(s, d->dlci);
1734 else
1735 d->state = BT_CLOSED;
1736 __rfcomm_dlc_close(d, ECONNREFUSED);
1737 continue;
1738 }
1739
1740 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
1741 continue;
1742
1743 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
1744 d->mscex == RFCOMM_MSCEX_OK)
1745 rfcomm_process_tx(d);
1746 }
1747 }
1748
1749 static inline void rfcomm_process_rx(struct rfcomm_session *s)
1750 {
1751 struct socket *sock = s->sock;
1752 struct sock *sk = sock->sk;
1753 struct sk_buff *skb;
1754
1755 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue));
1756
1757 /* Get data directly from socket receive queue without copying it. */
1758 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
1759 skb_orphan(skb);
1760 rfcomm_recv_frame(s, skb);
1761 }
1762
1763 if (sk->sk_state == BT_CLOSED) {
1764 if (!s->initiator)
1765 rfcomm_session_put(s);
1766
1767 rfcomm_session_close(s, sk->sk_err);
1768 }
1769 }
1770
1771 static inline void rfcomm_accept_connection(struct rfcomm_session *s)
1772 {
1773 struct socket *sock = s->sock, *nsock;
1774 int err;
1775
1776 /* Fast check for a new connection.
1777 * Avoids unnesesary socket allocations. */
1778 if (list_empty(&bt_sk(sock->sk)->accept_q))
1779 return;
1780
1781 BT_DBG("session %p", s);
1782
1783 err = kernel_accept(sock, &nsock, O_NONBLOCK);
1784 if (err < 0)
1785 return;
1786
1787 __module_get(nsock->ops->owner);
1788
1789 /* Set our callbacks */
1790 nsock->sk->sk_data_ready = rfcomm_l2data_ready;
1791 nsock->sk->sk_state_change = rfcomm_l2state_change;
1792
1793 s = rfcomm_session_add(nsock, BT_OPEN);
1794 if (s) {
1795 rfcomm_session_hold(s);
1796
1797 /* We should adjust MTU on incoming sessions.
1798 * L2CAP MTU minus UIH header and FCS. */
1799 s->mtu = min(l2cap_pi(nsock->sk)->omtu, l2cap_pi(nsock->sk)->imtu) - 5;
1800
1801 rfcomm_schedule(RFCOMM_SCHED_RX);
1802 } else
1803 sock_release(nsock);
1804 }
1805
1806 static inline void rfcomm_check_connection(struct rfcomm_session *s)
1807 {
1808 struct sock *sk = s->sock->sk;
1809
1810 BT_DBG("%p state %ld", s, s->state);
1811
1812 switch(sk->sk_state) {
1813 case BT_CONNECTED:
1814 s->state = BT_CONNECT;
1815
1816 /* We can adjust MTU on outgoing sessions.
1817 * L2CAP MTU minus UIH header and FCS. */
1818 s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5;
1819
1820 rfcomm_send_sabm(s, 0);
1821 break;
1822
1823 case BT_CLOSED:
1824 s->state = BT_CLOSED;
1825 rfcomm_session_close(s, sk->sk_err);
1826 break;
1827 }
1828 }
1829
1830 static inline void rfcomm_process_sessions(void)
1831 {
1832 struct list_head *p, *n;
1833
1834 rfcomm_lock();
1835
1836 list_for_each_safe(p, n, &session_list) {
1837 struct rfcomm_session *s;
1838 s = list_entry(p, struct rfcomm_session, list);
1839
1840 if (s->state == BT_LISTEN) {
1841 rfcomm_accept_connection(s);
1842 continue;
1843 }
1844
1845 rfcomm_session_hold(s);
1846
1847 switch (s->state) {
1848 case BT_BOUND:
1849 rfcomm_check_connection(s);
1850 break;
1851
1852 default:
1853 rfcomm_process_rx(s);
1854 break;
1855 }
1856
1857 rfcomm_process_dlcs(s);
1858
1859 rfcomm_session_put(s);
1860 }
1861
1862 rfcomm_unlock();
1863 }
1864
1865 static int rfcomm_add_listener(bdaddr_t *ba)
1866 {
1867 struct sockaddr_l2 addr;
1868 struct socket *sock;
1869 struct sock *sk;
1870 struct rfcomm_session *s;
1871 int err = 0;
1872
1873 /* Create socket */
1874 err = rfcomm_l2sock_create(&sock);
1875 if (err < 0) {
1876 BT_ERR("Create socket failed %d", err);
1877 return err;
1878 }
1879
1880 /* Bind socket */
1881 bacpy(&addr.l2_bdaddr, ba);
1882 addr.l2_family = AF_BLUETOOTH;
1883 addr.l2_psm = htobs(RFCOMM_PSM);
1884 err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
1885 if (err < 0) {
1886 BT_ERR("Bind failed %d", err);
1887 goto failed;
1888 }
1889
1890 /* Set L2CAP options */
1891 sk = sock->sk;
1892 lock_sock(sk);
1893 l2cap_pi(sk)->imtu = l2cap_mtu;
1894 release_sock(sk);
1895
1896 /* Start listening on the socket */
1897 err = kernel_listen(sock, 10);
1898 if (err) {
1899 BT_ERR("Listen failed %d", err);
1900 goto failed;
1901 }
1902
1903 /* Add listening session */
1904 s = rfcomm_session_add(sock, BT_LISTEN);
1905 if (!s)
1906 goto failed;
1907
1908 rfcomm_session_hold(s);
1909 return 0;
1910 failed:
1911 sock_release(sock);
1912 return err;
1913 }
1914
1915 static void rfcomm_kill_listener(void)
1916 {
1917 struct rfcomm_session *s;
1918 struct list_head *p, *n;
1919
1920 BT_DBG("");
1921
1922 list_for_each_safe(p, n, &session_list) {
1923 s = list_entry(p, struct rfcomm_session, list);
1924 rfcomm_session_del(s);
1925 }
1926 }
1927
1928 static int rfcomm_run(void *unused)
1929 {
1930 BT_DBG("");
1931
1932 set_user_nice(current, -10);
1933
1934 rfcomm_add_listener(BDADDR_ANY);
1935
1936 while (!kthread_should_stop()) {
1937 set_current_state(TASK_INTERRUPTIBLE);
1938 if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) {
1939 /* No pending events. Let's sleep.
1940 * Incoming connections and data will wake us up. */
1941 schedule();
1942 }
1943 set_current_state(TASK_RUNNING);
1944
1945 /* Process stuff */
1946 clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
1947 rfcomm_process_sessions();
1948 }
1949
1950 rfcomm_kill_listener();
1951
1952 return 0;
1953 }
1954
1955 static void rfcomm_auth_cfm(struct hci_conn *conn, u8 status)
1956 {
1957 struct rfcomm_session *s;
1958 struct rfcomm_dlc *d;
1959 struct list_head *p, *n;
1960
1961 BT_DBG("conn %p status 0x%02x", conn, status);
1962
1963 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
1964 if (!s)
1965 return;
1966
1967 rfcomm_session_hold(s);
1968
1969 list_for_each_safe(p, n, &s->dlcs) {
1970 d = list_entry(p, struct rfcomm_dlc, list);
1971
1972 if ((d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) &&
1973 !(conn->link_mode & HCI_LM_ENCRYPT) && !status)
1974 continue;
1975
1976 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
1977 continue;
1978
1979 if (!status)
1980 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
1981 else
1982 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
1983 }
1984
1985 rfcomm_session_put(s);
1986
1987 rfcomm_schedule(RFCOMM_SCHED_AUTH);
1988 }
1989
1990 static void rfcomm_encrypt_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
1991 {
1992 struct rfcomm_session *s;
1993 struct rfcomm_dlc *d;
1994 struct list_head *p, *n;
1995
1996 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);
1997
1998 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
1999 if (!s)
2000 return;
2001
2002 rfcomm_session_hold(s);
2003
2004 list_for_each_safe(p, n, &s->dlcs) {
2005 d = list_entry(p, struct rfcomm_dlc, list);
2006
2007 if ((d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) &&
2008 (d->state == BT_CONNECTED ||
2009 d->state == BT_CONFIG) &&
2010 !status && encrypt == 0x00) {
2011 __rfcomm_dlc_close(d, ECONNREFUSED);
2012 continue;
2013 }
2014
2015 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
2016 continue;
2017
2018 if (!status && encrypt)
2019 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
2020 else
2021 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
2022 }
2023
2024 rfcomm_session_put(s);
2025
2026 rfcomm_schedule(RFCOMM_SCHED_AUTH);
2027 }
2028
2029 static struct hci_cb rfcomm_cb = {
2030 .name = "RFCOMM",
2031 .auth_cfm = rfcomm_auth_cfm,
2032 .encrypt_cfm = rfcomm_encrypt_cfm
2033 };
2034
2035 static ssize_t rfcomm_dlc_sysfs_show(struct class *dev, char *buf)
2036 {
2037 struct rfcomm_session *s;
2038 struct list_head *pp, *p;
2039 char *str = buf;
2040
2041 rfcomm_lock();
2042
2043 list_for_each(p, &session_list) {
2044 s = list_entry(p, struct rfcomm_session, list);
2045 list_for_each(pp, &s->dlcs) {
2046 struct sock *sk = s->sock->sk;
2047 struct rfcomm_dlc *d = list_entry(pp, struct rfcomm_dlc, list);
2048
2049 str += sprintf(str, "%s %s %ld %d %d %d %d\n",
2050 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
2051 d->state, d->dlci, d->mtu, d->rx_credits, d->tx_credits);
2052 }
2053 }
2054
2055 rfcomm_unlock();
2056
2057 return (str - buf);
2058 }
2059
2060 static CLASS_ATTR(rfcomm_dlc, S_IRUGO, rfcomm_dlc_sysfs_show, NULL);
2061
2062 /* ---- Initialization ---- */
2063 static int __init rfcomm_init(void)
2064 {
2065 l2cap_load();
2066
2067 hci_register_cb(&rfcomm_cb);
2068
2069 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
2070 if (IS_ERR(rfcomm_thread)) {
2071 hci_unregister_cb(&rfcomm_cb);
2072 return PTR_ERR(rfcomm_thread);
2073 }
2074
2075 if (class_create_file(bt_class, &class_attr_rfcomm_dlc) < 0)
2076 BT_ERR("Failed to create RFCOMM info file");
2077
2078 rfcomm_init_sockets();
2079
2080 #ifdef CONFIG_BT_RFCOMM_TTY
2081 rfcomm_init_ttys();
2082 #endif
2083
2084 BT_INFO("RFCOMM ver %s", VERSION);
2085
2086 return 0;
2087 }
2088
2089 static void __exit rfcomm_exit(void)
2090 {
2091 class_remove_file(bt_class, &class_attr_rfcomm_dlc);
2092
2093 hci_unregister_cb(&rfcomm_cb);
2094
2095 kthread_stop(rfcomm_thread);
2096
2097 #ifdef CONFIG_BT_RFCOMM_TTY
2098 rfcomm_cleanup_ttys();
2099 #endif
2100
2101 rfcomm_cleanup_sockets();
2102 }
2103
2104 module_init(rfcomm_init);
2105 module_exit(rfcomm_exit);
2106
2107 module_param(disable_cfc, bool, 0644);
2108 MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
2109
2110 module_param(channel_mtu, int, 0644);
2111 MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
2112
2113 module_param(l2cap_mtu, uint, 0644);
2114 MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");
2115
2116 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
2117 MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
2118 MODULE_VERSION(VERSION);
2119 MODULE_LICENSE("GPL");
2120 MODULE_ALIAS("bt-proto-3");
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