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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
28#include <linux/module.h>
29#include <linux/debugfs.h>
30#include <linux/kthread.h>
31#include <linux/unaligned.h>
32
33#include <net/bluetooth/bluetooth.h>
34#include <net/bluetooth/hci_core.h>
35#include <net/bluetooth/l2cap.h>
36#include <net/bluetooth/rfcomm.h>
37
38#include <trace/events/sock.h>
39
40#define VERSION "1.11"
41
42static bool disable_cfc;
43static bool l2cap_ertm;
44static int channel_mtu = -1;
45
46static struct task_struct *rfcomm_thread;
47
48static DEFINE_MUTEX(rfcomm_mutex);
49#define rfcomm_lock() mutex_lock(&rfcomm_mutex)
50#define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
51
52
53static LIST_HEAD(session_list);
54
55static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
56static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
57static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
58static int rfcomm_queue_disc(struct rfcomm_dlc *d);
59static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
60static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
61static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
62static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
63static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
64static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
65
66static void rfcomm_process_connect(struct rfcomm_session *s);
67
68static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
69 bdaddr_t *dst,
70 u8 sec_level,
71 int *err);
72static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
73static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s);
74
75/* ---- RFCOMM frame parsing macros ---- */
76#define __get_dlci(b) ((b & 0xfc) >> 2)
77#define __get_type(b) ((b & 0xef))
78
79#define __test_ea(b) ((b & 0x01))
80#define __test_cr(b) (!!(b & 0x02))
81#define __test_pf(b) (!!(b & 0x10))
82
83#define __session_dir(s) ((s)->initiator ? 0x00 : 0x01)
84
85#define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
86#define __ctrl(type, pf) (((type & 0xef) | (pf << 4)))
87#define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir)
88#define __srv_channel(dlci) (dlci >> 1)
89
90#define __len8(len) (((len) << 1) | 1)
91#define __len16(len) ((len) << 1)
92
93/* MCC macros */
94#define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01))
95#define __get_mcc_type(b) ((b & 0xfc) >> 2)
96#define __get_mcc_len(b) ((b & 0xfe) >> 1)
97
98/* RPN macros */
99#define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
100#define __get_rpn_data_bits(line) ((line) & 0x3)
101#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
102#define __get_rpn_parity(line) (((line) >> 3) & 0x7)
103
104static DECLARE_WAIT_QUEUE_HEAD(rfcomm_wq);
105
106static void rfcomm_schedule(void)
107{
108 wake_up_all(&rfcomm_wq);
109}
110
111/* ---- RFCOMM FCS computation ---- */
112
113/* reversed, 8-bit, poly=0x07 */
114static unsigned char rfcomm_crc_table[256] = {
115 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
116 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
117 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
118 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
119
120 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
121 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
122 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
123 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
124
125 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
126 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
127 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
128 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
129
130 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
131 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
132 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
133 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
134
135 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
136 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
137 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
138 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
139
140 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
141 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
142 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
143 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
144
145 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
146 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
147 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
148 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
149
150 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
151 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
152 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
153 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
154};
155
156/* CRC on 2 bytes */
157#define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
158
159/* FCS on 2 bytes */
160static inline u8 __fcs(u8 *data)
161{
162 return 0xff - __crc(data);
163}
164
165/* FCS on 3 bytes */
166static inline u8 __fcs2(u8 *data)
167{
168 return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]];
169}
170
171/* Check FCS */
172static inline int __check_fcs(u8 *data, int type, u8 fcs)
173{
174 u8 f = __crc(data);
175
176 if (type != RFCOMM_UIH)
177 f = rfcomm_crc_table[f ^ data[2]];
178
179 return rfcomm_crc_table[f ^ fcs] != 0xcf;
180}
181
182/* ---- L2CAP callbacks ---- */
183static void rfcomm_l2state_change(struct sock *sk)
184{
185 BT_DBG("%p state %d", sk, sk->sk_state);
186 rfcomm_schedule();
187}
188
189static void rfcomm_l2data_ready(struct sock *sk)
190{
191 trace_sk_data_ready(sk);
192
193 BT_DBG("%p", sk);
194 rfcomm_schedule();
195}
196
197static int rfcomm_l2sock_create(struct socket **sock)
198{
199 int err;
200
201 BT_DBG("");
202
203 err = sock_create_kern(&init_net, PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
204 if (!err) {
205 struct sock *sk = (*sock)->sk;
206 sk->sk_data_ready = rfcomm_l2data_ready;
207 sk->sk_state_change = rfcomm_l2state_change;
208 }
209 return err;
210}
211
212static int rfcomm_check_security(struct rfcomm_dlc *d)
213{
214 struct sock *sk = d->session->sock->sk;
215 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
216
217 __u8 auth_type;
218
219 switch (d->sec_level) {
220 case BT_SECURITY_HIGH:
221 case BT_SECURITY_FIPS:
222 auth_type = HCI_AT_GENERAL_BONDING_MITM;
223 break;
224 case BT_SECURITY_MEDIUM:
225 auth_type = HCI_AT_GENERAL_BONDING;
226 break;
227 default:
228 auth_type = HCI_AT_NO_BONDING;
229 break;
230 }
231
232 return hci_conn_security(conn->hcon, d->sec_level, auth_type,
233 d->out);
234}
235
236static void rfcomm_session_timeout(struct timer_list *t)
237{
238 struct rfcomm_session *s = from_timer(s, t, timer);
239
240 BT_DBG("session %p state %ld", s, s->state);
241
242 set_bit(RFCOMM_TIMED_OUT, &s->flags);
243 rfcomm_schedule();
244}
245
246static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout)
247{
248 BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout);
249
250 mod_timer(&s->timer, jiffies + timeout);
251}
252
253static void rfcomm_session_clear_timer(struct rfcomm_session *s)
254{
255 BT_DBG("session %p state %ld", s, s->state);
256
257 del_timer_sync(&s->timer);
258}
259
260/* ---- RFCOMM DLCs ---- */
261static void rfcomm_dlc_timeout(struct timer_list *t)
262{
263 struct rfcomm_dlc *d = from_timer(d, t, timer);
264
265 BT_DBG("dlc %p state %ld", d, d->state);
266
267 set_bit(RFCOMM_TIMED_OUT, &d->flags);
268 rfcomm_dlc_put(d);
269 rfcomm_schedule();
270}
271
272static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
273{
274 BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);
275
276 if (!mod_timer(&d->timer, jiffies + timeout))
277 rfcomm_dlc_hold(d);
278}
279
280static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
281{
282 BT_DBG("dlc %p state %ld", d, d->state);
283
284 if (del_timer(&d->timer))
285 rfcomm_dlc_put(d);
286}
287
288static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
289{
290 BT_DBG("%p", d);
291
292 d->state = BT_OPEN;
293 d->flags = 0;
294 d->mscex = 0;
295 d->sec_level = BT_SECURITY_LOW;
296 d->mtu = RFCOMM_DEFAULT_MTU;
297 d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV;
298
299 d->cfc = RFCOMM_CFC_DISABLED;
300 d->rx_credits = RFCOMM_DEFAULT_CREDITS;
301}
302
303struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
304{
305 struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);
306
307 if (!d)
308 return NULL;
309
310 timer_setup(&d->timer, rfcomm_dlc_timeout, 0);
311
312 skb_queue_head_init(&d->tx_queue);
313 mutex_init(&d->lock);
314 refcount_set(&d->refcnt, 1);
315
316 rfcomm_dlc_clear_state(d);
317
318 BT_DBG("%p", d);
319
320 return d;
321}
322
323void rfcomm_dlc_free(struct rfcomm_dlc *d)
324{
325 BT_DBG("%p", d);
326
327 skb_queue_purge(&d->tx_queue);
328 kfree(d);
329}
330
331static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
332{
333 BT_DBG("dlc %p session %p", d, s);
334
335 rfcomm_session_clear_timer(s);
336 rfcomm_dlc_hold(d);
337 list_add(&d->list, &s->dlcs);
338 d->session = s;
339}
340
341static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
342{
343 struct rfcomm_session *s = d->session;
344
345 BT_DBG("dlc %p refcnt %d session %p", d, refcount_read(&d->refcnt), s);
346
347 list_del(&d->list);
348 d->session = NULL;
349 rfcomm_dlc_put(d);
350
351 if (list_empty(&s->dlcs))
352 rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT);
353}
354
355static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
356{
357 struct rfcomm_dlc *d;
358
359 list_for_each_entry(d, &s->dlcs, list)
360 if (d->dlci == dlci)
361 return d;
362
363 return NULL;
364}
365
366static int rfcomm_check_channel(u8 channel)
367{
368 return channel < 1 || channel > 30;
369}
370
371static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
372{
373 struct rfcomm_session *s;
374 int err = 0;
375 u8 dlci;
376
377 BT_DBG("dlc %p state %ld %pMR -> %pMR channel %d",
378 d, d->state, src, dst, channel);
379
380 if (rfcomm_check_channel(channel))
381 return -EINVAL;
382
383 if (d->state != BT_OPEN && d->state != BT_CLOSED)
384 return 0;
385
386 s = rfcomm_session_get(src, dst);
387 if (!s) {
388 s = rfcomm_session_create(src, dst, d->sec_level, &err);
389 if (!s)
390 return err;
391 }
392
393 dlci = __dlci(__session_dir(s), channel);
394
395 /* Check if DLCI already exists */
396 if (rfcomm_dlc_get(s, dlci))
397 return -EBUSY;
398
399 rfcomm_dlc_clear_state(d);
400
401 d->dlci = dlci;
402 d->addr = __addr(s->initiator, dlci);
403 d->priority = 7;
404
405 d->state = BT_CONFIG;
406 rfcomm_dlc_link(s, d);
407
408 d->out = 1;
409
410 d->mtu = s->mtu;
411 d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;
412
413 if (s->state == BT_CONNECTED) {
414 if (rfcomm_check_security(d))
415 rfcomm_send_pn(s, 1, d);
416 else
417 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
418 }
419
420 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
421
422 return 0;
423}
424
425int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
426{
427 int r;
428
429 rfcomm_lock();
430
431 r = __rfcomm_dlc_open(d, src, dst, channel);
432
433 rfcomm_unlock();
434 return r;
435}
436
437static void __rfcomm_dlc_disconn(struct rfcomm_dlc *d)
438{
439 struct rfcomm_session *s = d->session;
440
441 d->state = BT_DISCONN;
442 if (skb_queue_empty(&d->tx_queue)) {
443 rfcomm_send_disc(s, d->dlci);
444 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
445 } else {
446 rfcomm_queue_disc(d);
447 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
448 }
449}
450
451static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
452{
453 struct rfcomm_session *s = d->session;
454 if (!s)
455 return 0;
456
457 BT_DBG("dlc %p state %ld dlci %d err %d session %p",
458 d, d->state, d->dlci, err, s);
459
460 switch (d->state) {
461 case BT_CONNECT:
462 case BT_CONFIG:
463 case BT_OPEN:
464 case BT_CONNECT2:
465 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
466 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
467 rfcomm_schedule();
468 return 0;
469 }
470 }
471
472 switch (d->state) {
473 case BT_CONNECT:
474 case BT_CONNECTED:
475 __rfcomm_dlc_disconn(d);
476 break;
477
478 case BT_CONFIG:
479 if (s->state != BT_BOUND) {
480 __rfcomm_dlc_disconn(d);
481 break;
482 }
483 /* if closing a dlc in a session that hasn't been started,
484 * just close and unlink the dlc
485 */
486 fallthrough;
487
488 default:
489 rfcomm_dlc_clear_timer(d);
490
491 rfcomm_dlc_lock(d);
492 d->state = BT_CLOSED;
493 d->state_change(d, err);
494 rfcomm_dlc_unlock(d);
495
496 skb_queue_purge(&d->tx_queue);
497 rfcomm_dlc_unlink(d);
498 }
499
500 return 0;
501}
502
503int rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
504{
505 int r = 0;
506 struct rfcomm_dlc *d_list;
507 struct rfcomm_session *s, *s_list;
508
509 BT_DBG("dlc %p state %ld dlci %d err %d", d, d->state, d->dlci, err);
510
511 rfcomm_lock();
512
513 s = d->session;
514 if (!s)
515 goto no_session;
516
517 /* after waiting on the mutex check the session still exists
518 * then check the dlc still exists
519 */
520 list_for_each_entry(s_list, &session_list, list) {
521 if (s_list == s) {
522 list_for_each_entry(d_list, &s->dlcs, list) {
523 if (d_list == d) {
524 r = __rfcomm_dlc_close(d, err);
525 break;
526 }
527 }
528 break;
529 }
530 }
531
532no_session:
533 rfcomm_unlock();
534 return r;
535}
536
537struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel)
538{
539 struct rfcomm_session *s;
540 struct rfcomm_dlc *dlc = NULL;
541 u8 dlci;
542
543 if (rfcomm_check_channel(channel))
544 return ERR_PTR(-EINVAL);
545
546 rfcomm_lock();
547 s = rfcomm_session_get(src, dst);
548 if (s) {
549 dlci = __dlci(__session_dir(s), channel);
550 dlc = rfcomm_dlc_get(s, dlci);
551 }
552 rfcomm_unlock();
553 return dlc;
554}
555
556static int rfcomm_dlc_send_frag(struct rfcomm_dlc *d, struct sk_buff *frag)
557{
558 int len = frag->len;
559
560 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
561
562 if (len > d->mtu)
563 return -EINVAL;
564
565 rfcomm_make_uih(frag, d->addr);
566 __skb_queue_tail(&d->tx_queue, frag);
567
568 return len;
569}
570
571int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
572{
573 unsigned long flags;
574 struct sk_buff *frag, *next;
575 int len;
576
577 if (d->state != BT_CONNECTED)
578 return -ENOTCONN;
579
580 frag = skb_shinfo(skb)->frag_list;
581 skb_shinfo(skb)->frag_list = NULL;
582
583 /* Queue all fragments atomically. */
584 spin_lock_irqsave(&d->tx_queue.lock, flags);
585
586 len = rfcomm_dlc_send_frag(d, skb);
587 if (len < 0 || !frag)
588 goto unlock;
589
590 for (; frag; frag = next) {
591 int ret;
592
593 next = frag->next;
594
595 ret = rfcomm_dlc_send_frag(d, frag);
596 if (ret < 0) {
597 dev_kfree_skb_irq(frag);
598 goto unlock;
599 }
600
601 len += ret;
602 }
603
604unlock:
605 spin_unlock_irqrestore(&d->tx_queue.lock, flags);
606
607 if (len > 0 && !test_bit(RFCOMM_TX_THROTTLED, &d->flags))
608 rfcomm_schedule();
609 return len;
610}
611
612void rfcomm_dlc_send_noerror(struct rfcomm_dlc *d, struct sk_buff *skb)
613{
614 int len = skb->len;
615
616 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
617
618 rfcomm_make_uih(skb, d->addr);
619 skb_queue_tail(&d->tx_queue, skb);
620
621 if (d->state == BT_CONNECTED &&
622 !test_bit(RFCOMM_TX_THROTTLED, &d->flags))
623 rfcomm_schedule();
624}
625
626void __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
627{
628 BT_DBG("dlc %p state %ld", d, d->state);
629
630 if (!d->cfc) {
631 d->v24_sig |= RFCOMM_V24_FC;
632 set_bit(RFCOMM_MSC_PENDING, &d->flags);
633 }
634 rfcomm_schedule();
635}
636
637void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
638{
639 BT_DBG("dlc %p state %ld", d, d->state);
640
641 if (!d->cfc) {
642 d->v24_sig &= ~RFCOMM_V24_FC;
643 set_bit(RFCOMM_MSC_PENDING, &d->flags);
644 }
645 rfcomm_schedule();
646}
647
648/*
649 Set/get modem status functions use _local_ status i.e. what we report
650 to the other side.
651 Remote status is provided by dlc->modem_status() callback.
652 */
653int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig)
654{
655 BT_DBG("dlc %p state %ld v24_sig 0x%x",
656 d, d->state, v24_sig);
657
658 if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
659 v24_sig |= RFCOMM_V24_FC;
660 else
661 v24_sig &= ~RFCOMM_V24_FC;
662
663 d->v24_sig = v24_sig;
664
665 if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags))
666 rfcomm_schedule();
667
668 return 0;
669}
670
671int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig)
672{
673 BT_DBG("dlc %p state %ld v24_sig 0x%x",
674 d, d->state, d->v24_sig);
675
676 *v24_sig = d->v24_sig;
677 return 0;
678}
679
680/* ---- RFCOMM sessions ---- */
681static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
682{
683 struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL);
684
685 if (!s)
686 return NULL;
687
688 BT_DBG("session %p sock %p", s, sock);
689
690 timer_setup(&s->timer, rfcomm_session_timeout, 0);
691
692 INIT_LIST_HEAD(&s->dlcs);
693 s->state = state;
694 s->sock = sock;
695
696 s->mtu = RFCOMM_DEFAULT_MTU;
697 s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;
698
699 /* Do not increment module usage count for listening sessions.
700 * Otherwise we won't be able to unload the module. */
701 if (state != BT_LISTEN)
702 if (!try_module_get(THIS_MODULE)) {
703 kfree(s);
704 return NULL;
705 }
706
707 list_add(&s->list, &session_list);
708
709 return s;
710}
711
712static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s)
713{
714 int state = s->state;
715
716 BT_DBG("session %p state %ld", s, s->state);
717
718 list_del(&s->list);
719
720 rfcomm_session_clear_timer(s);
721 sock_release(s->sock);
722 kfree(s);
723
724 if (state != BT_LISTEN)
725 module_put(THIS_MODULE);
726
727 return NULL;
728}
729
730static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst)
731{
732 struct rfcomm_session *s, *n;
733 struct l2cap_chan *chan;
734 list_for_each_entry_safe(s, n, &session_list, list) {
735 chan = l2cap_pi(s->sock->sk)->chan;
736
737 if ((!bacmp(src, BDADDR_ANY) || !bacmp(&chan->src, src)) &&
738 !bacmp(&chan->dst, dst))
739 return s;
740 }
741 return NULL;
742}
743
744static struct rfcomm_session *rfcomm_session_close(struct rfcomm_session *s,
745 int err)
746{
747 struct rfcomm_dlc *d, *n;
748
749 s->state = BT_CLOSED;
750
751 BT_DBG("session %p state %ld err %d", s, s->state, err);
752
753 /* Close all dlcs */
754 list_for_each_entry_safe(d, n, &s->dlcs, list) {
755 d->state = BT_CLOSED;
756 __rfcomm_dlc_close(d, err);
757 }
758
759 rfcomm_session_clear_timer(s);
760 return rfcomm_session_del(s);
761}
762
763static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
764 bdaddr_t *dst,
765 u8 sec_level,
766 int *err)
767{
768 struct rfcomm_session *s = NULL;
769 struct sockaddr_l2 addr;
770 struct socket *sock;
771 struct sock *sk;
772
773 BT_DBG("%pMR -> %pMR", src, dst);
774
775 *err = rfcomm_l2sock_create(&sock);
776 if (*err < 0)
777 return NULL;
778
779 bacpy(&addr.l2_bdaddr, src);
780 addr.l2_family = AF_BLUETOOTH;
781 addr.l2_psm = 0;
782 addr.l2_cid = 0;
783 addr.l2_bdaddr_type = BDADDR_BREDR;
784 *err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
785 if (*err < 0)
786 goto failed;
787
788 /* Set L2CAP options */
789 sk = sock->sk;
790 lock_sock(sk);
791 /* Set MTU to 0 so L2CAP can auto select the MTU */
792 l2cap_pi(sk)->chan->imtu = 0;
793 l2cap_pi(sk)->chan->sec_level = sec_level;
794 if (l2cap_ertm)
795 l2cap_pi(sk)->chan->mode = L2CAP_MODE_ERTM;
796 release_sock(sk);
797
798 s = rfcomm_session_add(sock, BT_BOUND);
799 if (!s) {
800 *err = -ENOMEM;
801 goto failed;
802 }
803
804 s->initiator = 1;
805
806 bacpy(&addr.l2_bdaddr, dst);
807 addr.l2_family = AF_BLUETOOTH;
808 addr.l2_psm = cpu_to_le16(L2CAP_PSM_RFCOMM);
809 addr.l2_cid = 0;
810 addr.l2_bdaddr_type = BDADDR_BREDR;
811 *err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
812 if (*err == 0 || *err == -EINPROGRESS)
813 return s;
814
815 return rfcomm_session_del(s);
816
817failed:
818 sock_release(sock);
819 return NULL;
820}
821
822void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst)
823{
824 struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan;
825 if (src)
826 bacpy(src, &chan->src);
827 if (dst)
828 bacpy(dst, &chan->dst);
829}
830
831/* ---- RFCOMM frame sending ---- */
832static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len)
833{
834 struct kvec iv = { data, len };
835 struct msghdr msg;
836
837 BT_DBG("session %p len %d", s, len);
838
839 memset(&msg, 0, sizeof(msg));
840
841 return kernel_sendmsg(s->sock, &msg, &iv, 1, len);
842}
843
844static int rfcomm_send_cmd(struct rfcomm_session *s, struct rfcomm_cmd *cmd)
845{
846 BT_DBG("%p cmd %u", s, cmd->ctrl);
847
848 return rfcomm_send_frame(s, (void *) cmd, sizeof(*cmd));
849}
850
851static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci)
852{
853 struct rfcomm_cmd cmd;
854
855 BT_DBG("%p dlci %d", s, dlci);
856
857 cmd.addr = __addr(s->initiator, dlci);
858 cmd.ctrl = __ctrl(RFCOMM_SABM, 1);
859 cmd.len = __len8(0);
860 cmd.fcs = __fcs2((u8 *) &cmd);
861
862 return rfcomm_send_cmd(s, &cmd);
863}
864
865static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci)
866{
867 struct rfcomm_cmd cmd;
868
869 BT_DBG("%p dlci %d", s, dlci);
870
871 cmd.addr = __addr(!s->initiator, dlci);
872 cmd.ctrl = __ctrl(RFCOMM_UA, 1);
873 cmd.len = __len8(0);
874 cmd.fcs = __fcs2((u8 *) &cmd);
875
876 return rfcomm_send_cmd(s, &cmd);
877}
878
879static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci)
880{
881 struct rfcomm_cmd cmd;
882
883 BT_DBG("%p dlci %d", s, dlci);
884
885 cmd.addr = __addr(s->initiator, dlci);
886 cmd.ctrl = __ctrl(RFCOMM_DISC, 1);
887 cmd.len = __len8(0);
888 cmd.fcs = __fcs2((u8 *) &cmd);
889
890 return rfcomm_send_cmd(s, &cmd);
891}
892
893static int rfcomm_queue_disc(struct rfcomm_dlc *d)
894{
895 struct rfcomm_cmd *cmd;
896 struct sk_buff *skb;
897
898 BT_DBG("dlc %p dlci %d", d, d->dlci);
899
900 skb = alloc_skb(sizeof(*cmd), GFP_KERNEL);
901 if (!skb)
902 return -ENOMEM;
903
904 cmd = __skb_put(skb, sizeof(*cmd));
905 cmd->addr = d->addr;
906 cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
907 cmd->len = __len8(0);
908 cmd->fcs = __fcs2((u8 *) cmd);
909
910 skb_queue_tail(&d->tx_queue, skb);
911 rfcomm_schedule();
912 return 0;
913}
914
915static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci)
916{
917 struct rfcomm_cmd cmd;
918
919 BT_DBG("%p dlci %d", s, dlci);
920
921 cmd.addr = __addr(!s->initiator, dlci);
922 cmd.ctrl = __ctrl(RFCOMM_DM, 1);
923 cmd.len = __len8(0);
924 cmd.fcs = __fcs2((u8 *) &cmd);
925
926 return rfcomm_send_cmd(s, &cmd);
927}
928
929static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type)
930{
931 struct rfcomm_hdr *hdr;
932 struct rfcomm_mcc *mcc;
933 u8 buf[16], *ptr = buf;
934
935 BT_DBG("%p cr %d type %d", s, cr, type);
936
937 hdr = (void *) ptr; ptr += sizeof(*hdr);
938 hdr->addr = __addr(s->initiator, 0);
939 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
940 hdr->len = __len8(sizeof(*mcc) + 1);
941
942 mcc = (void *) ptr; ptr += sizeof(*mcc);
943 mcc->type = __mcc_type(0, RFCOMM_NSC);
944 mcc->len = __len8(1);
945
946 /* Type that we didn't like */
947 *ptr = __mcc_type(cr, type); ptr++;
948
949 *ptr = __fcs(buf); ptr++;
950
951 return rfcomm_send_frame(s, buf, ptr - buf);
952}
953
954static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d)
955{
956 struct rfcomm_hdr *hdr;
957 struct rfcomm_mcc *mcc;
958 struct rfcomm_pn *pn;
959 u8 buf[16], *ptr = buf;
960
961 BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu);
962
963 hdr = (void *) ptr; ptr += sizeof(*hdr);
964 hdr->addr = __addr(s->initiator, 0);
965 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
966 hdr->len = __len8(sizeof(*mcc) + sizeof(*pn));
967
968 mcc = (void *) ptr; ptr += sizeof(*mcc);
969 mcc->type = __mcc_type(cr, RFCOMM_PN);
970 mcc->len = __len8(sizeof(*pn));
971
972 pn = (void *) ptr; ptr += sizeof(*pn);
973 pn->dlci = d->dlci;
974 pn->priority = d->priority;
975 pn->ack_timer = 0;
976 pn->max_retrans = 0;
977
978 if (s->cfc) {
979 pn->flow_ctrl = cr ? 0xf0 : 0xe0;
980 pn->credits = RFCOMM_DEFAULT_CREDITS;
981 } else {
982 pn->flow_ctrl = 0;
983 pn->credits = 0;
984 }
985
986 if (cr && channel_mtu >= 0)
987 pn->mtu = cpu_to_le16(channel_mtu);
988 else
989 pn->mtu = cpu_to_le16(d->mtu);
990
991 *ptr = __fcs(buf); ptr++;
992
993 return rfcomm_send_frame(s, buf, ptr - buf);
994}
995
996int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
997 u8 bit_rate, u8 data_bits, u8 stop_bits,
998 u8 parity, u8 flow_ctrl_settings,
999 u8 xon_char, u8 xoff_char, u16 param_mask)
1000{
1001 struct rfcomm_hdr *hdr;
1002 struct rfcomm_mcc *mcc;
1003 struct rfcomm_rpn *rpn;
1004 u8 buf[16], *ptr = buf;
1005
1006 BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x"
1007 " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x",
1008 s, cr, dlci, bit_rate, data_bits, stop_bits, parity,
1009 flow_ctrl_settings, xon_char, xoff_char, param_mask);
1010
1011 hdr = (void *) ptr; ptr += sizeof(*hdr);
1012 hdr->addr = __addr(s->initiator, 0);
1013 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1014 hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn));
1015
1016 mcc = (void *) ptr; ptr += sizeof(*mcc);
1017 mcc->type = __mcc_type(cr, RFCOMM_RPN);
1018 mcc->len = __len8(sizeof(*rpn));
1019
1020 rpn = (void *) ptr; ptr += sizeof(*rpn);
1021 rpn->dlci = __addr(1, dlci);
1022 rpn->bit_rate = bit_rate;
1023 rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity);
1024 rpn->flow_ctrl = flow_ctrl_settings;
1025 rpn->xon_char = xon_char;
1026 rpn->xoff_char = xoff_char;
1027 rpn->param_mask = cpu_to_le16(param_mask);
1028
1029 *ptr = __fcs(buf); ptr++;
1030
1031 return rfcomm_send_frame(s, buf, ptr - buf);
1032}
1033
1034static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status)
1035{
1036 struct rfcomm_hdr *hdr;
1037 struct rfcomm_mcc *mcc;
1038 struct rfcomm_rls *rls;
1039 u8 buf[16], *ptr = buf;
1040
1041 BT_DBG("%p cr %d status 0x%x", s, cr, status);
1042
1043 hdr = (void *) ptr; ptr += sizeof(*hdr);
1044 hdr->addr = __addr(s->initiator, 0);
1045 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1046 hdr->len = __len8(sizeof(*mcc) + sizeof(*rls));
1047
1048 mcc = (void *) ptr; ptr += sizeof(*mcc);
1049 mcc->type = __mcc_type(cr, RFCOMM_RLS);
1050 mcc->len = __len8(sizeof(*rls));
1051
1052 rls = (void *) ptr; ptr += sizeof(*rls);
1053 rls->dlci = __addr(1, dlci);
1054 rls->status = status;
1055
1056 *ptr = __fcs(buf); ptr++;
1057
1058 return rfcomm_send_frame(s, buf, ptr - buf);
1059}
1060
1061static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig)
1062{
1063 struct rfcomm_hdr *hdr;
1064 struct rfcomm_mcc *mcc;
1065 struct rfcomm_msc *msc;
1066 u8 buf[16], *ptr = buf;
1067
1068 BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig);
1069
1070 hdr = (void *) ptr; ptr += sizeof(*hdr);
1071 hdr->addr = __addr(s->initiator, 0);
1072 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1073 hdr->len = __len8(sizeof(*mcc) + sizeof(*msc));
1074
1075 mcc = (void *) ptr; ptr += sizeof(*mcc);
1076 mcc->type = __mcc_type(cr, RFCOMM_MSC);
1077 mcc->len = __len8(sizeof(*msc));
1078
1079 msc = (void *) ptr; ptr += sizeof(*msc);
1080 msc->dlci = __addr(1, dlci);
1081 msc->v24_sig = v24_sig | 0x01;
1082
1083 *ptr = __fcs(buf); ptr++;
1084
1085 return rfcomm_send_frame(s, buf, ptr - buf);
1086}
1087
1088static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr)
1089{
1090 struct rfcomm_hdr *hdr;
1091 struct rfcomm_mcc *mcc;
1092 u8 buf[16], *ptr = buf;
1093
1094 BT_DBG("%p cr %d", s, cr);
1095
1096 hdr = (void *) ptr; ptr += sizeof(*hdr);
1097 hdr->addr = __addr(s->initiator, 0);
1098 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1099 hdr->len = __len8(sizeof(*mcc));
1100
1101 mcc = (void *) ptr; ptr += sizeof(*mcc);
1102 mcc->type = __mcc_type(cr, RFCOMM_FCOFF);
1103 mcc->len = __len8(0);
1104
1105 *ptr = __fcs(buf); ptr++;
1106
1107 return rfcomm_send_frame(s, buf, ptr - buf);
1108}
1109
1110static int rfcomm_send_fcon(struct rfcomm_session *s, int cr)
1111{
1112 struct rfcomm_hdr *hdr;
1113 struct rfcomm_mcc *mcc;
1114 u8 buf[16], *ptr = buf;
1115
1116 BT_DBG("%p cr %d", s, cr);
1117
1118 hdr = (void *) ptr; ptr += sizeof(*hdr);
1119 hdr->addr = __addr(s->initiator, 0);
1120 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1121 hdr->len = __len8(sizeof(*mcc));
1122
1123 mcc = (void *) ptr; ptr += sizeof(*mcc);
1124 mcc->type = __mcc_type(cr, RFCOMM_FCON);
1125 mcc->len = __len8(0);
1126
1127 *ptr = __fcs(buf); ptr++;
1128
1129 return rfcomm_send_frame(s, buf, ptr - buf);
1130}
1131
1132static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len)
1133{
1134 struct socket *sock = s->sock;
1135 struct kvec iv[3];
1136 struct msghdr msg;
1137 unsigned char hdr[5], crc[1];
1138
1139 if (len > 125)
1140 return -EINVAL;
1141
1142 BT_DBG("%p cr %d", s, cr);
1143
1144 hdr[0] = __addr(s->initiator, 0);
1145 hdr[1] = __ctrl(RFCOMM_UIH, 0);
1146 hdr[2] = 0x01 | ((len + 2) << 1);
1147 hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2);
1148 hdr[4] = 0x01 | (len << 1);
1149
1150 crc[0] = __fcs(hdr);
1151
1152 iv[0].iov_base = hdr;
1153 iv[0].iov_len = 5;
1154 iv[1].iov_base = pattern;
1155 iv[1].iov_len = len;
1156 iv[2].iov_base = crc;
1157 iv[2].iov_len = 1;
1158
1159 memset(&msg, 0, sizeof(msg));
1160
1161 return kernel_sendmsg(sock, &msg, iv, 3, 6 + len);
1162}
1163
1164static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits)
1165{
1166 struct rfcomm_hdr *hdr;
1167 u8 buf[16], *ptr = buf;
1168
1169 BT_DBG("%p addr %d credits %d", s, addr, credits);
1170
1171 hdr = (void *) ptr; ptr += sizeof(*hdr);
1172 hdr->addr = addr;
1173 hdr->ctrl = __ctrl(RFCOMM_UIH, 1);
1174 hdr->len = __len8(0);
1175
1176 *ptr = credits; ptr++;
1177
1178 *ptr = __fcs(buf); ptr++;
1179
1180 return rfcomm_send_frame(s, buf, ptr - buf);
1181}
1182
1183static void rfcomm_make_uih(struct sk_buff *skb, u8 addr)
1184{
1185 struct rfcomm_hdr *hdr;
1186 int len = skb->len;
1187 u8 *crc;
1188
1189 if (len > 127) {
1190 hdr = skb_push(skb, 4);
1191 put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len);
1192 } else {
1193 hdr = skb_push(skb, 3);
1194 hdr->len = __len8(len);
1195 }
1196 hdr->addr = addr;
1197 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1198
1199 crc = skb_put(skb, 1);
1200 *crc = __fcs((void *) hdr);
1201}
1202
1203/* ---- RFCOMM frame reception ---- */
1204static struct rfcomm_session *rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci)
1205{
1206 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1207
1208 if (dlci) {
1209 /* Data channel */
1210 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1211 if (!d) {
1212 rfcomm_send_dm(s, dlci);
1213 return s;
1214 }
1215
1216 switch (d->state) {
1217 case BT_CONNECT:
1218 rfcomm_dlc_clear_timer(d);
1219
1220 rfcomm_dlc_lock(d);
1221 d->state = BT_CONNECTED;
1222 d->state_change(d, 0);
1223 rfcomm_dlc_unlock(d);
1224
1225 rfcomm_send_msc(s, 1, dlci, d->v24_sig);
1226 break;
1227
1228 case BT_DISCONN:
1229 d->state = BT_CLOSED;
1230 __rfcomm_dlc_close(d, 0);
1231
1232 if (list_empty(&s->dlcs)) {
1233 s->state = BT_DISCONN;
1234 rfcomm_send_disc(s, 0);
1235 rfcomm_session_clear_timer(s);
1236 }
1237
1238 break;
1239 }
1240 } else {
1241 /* Control channel */
1242 switch (s->state) {
1243 case BT_CONNECT:
1244 s->state = BT_CONNECTED;
1245 rfcomm_process_connect(s);
1246 break;
1247
1248 case BT_DISCONN:
1249 s = rfcomm_session_close(s, ECONNRESET);
1250 break;
1251 }
1252 }
1253 return s;
1254}
1255
1256static struct rfcomm_session *rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci)
1257{
1258 int err = 0;
1259
1260 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1261
1262 if (dlci) {
1263 /* Data DLC */
1264 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1265 if (d) {
1266 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1267 err = ECONNREFUSED;
1268 else
1269 err = ECONNRESET;
1270
1271 d->state = BT_CLOSED;
1272 __rfcomm_dlc_close(d, err);
1273 }
1274 } else {
1275 if (s->state == BT_CONNECT)
1276 err = ECONNREFUSED;
1277 else
1278 err = ECONNRESET;
1279
1280 s = rfcomm_session_close(s, err);
1281 }
1282 return s;
1283}
1284
1285static struct rfcomm_session *rfcomm_recv_disc(struct rfcomm_session *s,
1286 u8 dlci)
1287{
1288 int err = 0;
1289
1290 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1291
1292 if (dlci) {
1293 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1294 if (d) {
1295 rfcomm_send_ua(s, dlci);
1296
1297 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1298 err = ECONNREFUSED;
1299 else
1300 err = ECONNRESET;
1301
1302 d->state = BT_CLOSED;
1303 __rfcomm_dlc_close(d, err);
1304 } else
1305 rfcomm_send_dm(s, dlci);
1306
1307 } else {
1308 rfcomm_send_ua(s, 0);
1309
1310 if (s->state == BT_CONNECT)
1311 err = ECONNREFUSED;
1312 else
1313 err = ECONNRESET;
1314
1315 s = rfcomm_session_close(s, err);
1316 }
1317 return s;
1318}
1319
1320void rfcomm_dlc_accept(struct rfcomm_dlc *d)
1321{
1322 struct sock *sk = d->session->sock->sk;
1323 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
1324
1325 BT_DBG("dlc %p", d);
1326
1327 rfcomm_send_ua(d->session, d->dlci);
1328
1329 rfcomm_dlc_clear_timer(d);
1330
1331 rfcomm_dlc_lock(d);
1332 d->state = BT_CONNECTED;
1333 d->state_change(d, 0);
1334 rfcomm_dlc_unlock(d);
1335
1336 if (d->role_switch)
1337 hci_conn_switch_role(conn->hcon, 0x00);
1338
1339 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1340}
1341
1342static void rfcomm_check_accept(struct rfcomm_dlc *d)
1343{
1344 if (rfcomm_check_security(d)) {
1345 if (d->defer_setup) {
1346 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1347 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1348
1349 rfcomm_dlc_lock(d);
1350 d->state = BT_CONNECT2;
1351 d->state_change(d, 0);
1352 rfcomm_dlc_unlock(d);
1353 } else
1354 rfcomm_dlc_accept(d);
1355 } else {
1356 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1357 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1358 }
1359}
1360
1361static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
1362{
1363 struct rfcomm_dlc *d;
1364 u8 channel;
1365
1366 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1367
1368 if (!dlci) {
1369 rfcomm_send_ua(s, 0);
1370
1371 if (s->state == BT_OPEN) {
1372 s->state = BT_CONNECTED;
1373 rfcomm_process_connect(s);
1374 }
1375 return 0;
1376 }
1377
1378 /* Check if DLC exists */
1379 d = rfcomm_dlc_get(s, dlci);
1380 if (d) {
1381 if (d->state == BT_OPEN) {
1382 /* DLC was previously opened by PN request */
1383 rfcomm_check_accept(d);
1384 }
1385 return 0;
1386 }
1387
1388 /* Notify socket layer about incoming connection */
1389 channel = __srv_channel(dlci);
1390 if (rfcomm_connect_ind(s, channel, &d)) {
1391 d->dlci = dlci;
1392 d->addr = __addr(s->initiator, dlci);
1393 rfcomm_dlc_link(s, d);
1394
1395 rfcomm_check_accept(d);
1396 } else {
1397 rfcomm_send_dm(s, dlci);
1398 }
1399
1400 return 0;
1401}
1402
1403static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
1404{
1405 struct rfcomm_session *s = d->session;
1406
1407 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
1408 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);
1409
1410 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
1411 pn->flow_ctrl == 0xe0) {
1412 d->cfc = RFCOMM_CFC_ENABLED;
1413 d->tx_credits = pn->credits;
1414 } else {
1415 d->cfc = RFCOMM_CFC_DISABLED;
1416 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1417 }
1418
1419 if (s->cfc == RFCOMM_CFC_UNKNOWN)
1420 s->cfc = d->cfc;
1421
1422 d->priority = pn->priority;
1423
1424 d->mtu = __le16_to_cpu(pn->mtu);
1425
1426 if (cr && d->mtu > s->mtu)
1427 d->mtu = s->mtu;
1428
1429 return 0;
1430}
1431
1432static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1433{
1434 struct rfcomm_pn *pn = (void *) skb->data;
1435 struct rfcomm_dlc *d;
1436 u8 dlci = pn->dlci;
1437
1438 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1439
1440 if (!dlci)
1441 return 0;
1442
1443 d = rfcomm_dlc_get(s, dlci);
1444 if (d) {
1445 if (cr) {
1446 /* PN request */
1447 rfcomm_apply_pn(d, cr, pn);
1448 rfcomm_send_pn(s, 0, d);
1449 } else {
1450 /* PN response */
1451 switch (d->state) {
1452 case BT_CONFIG:
1453 rfcomm_apply_pn(d, cr, pn);
1454
1455 d->state = BT_CONNECT;
1456 rfcomm_send_sabm(s, d->dlci);
1457 break;
1458 }
1459 }
1460 } else {
1461 u8 channel = __srv_channel(dlci);
1462
1463 if (!cr)
1464 return 0;
1465
1466 /* PN request for non existing DLC.
1467 * Assume incoming connection. */
1468 if (rfcomm_connect_ind(s, channel, &d)) {
1469 d->dlci = dlci;
1470 d->addr = __addr(s->initiator, dlci);
1471 rfcomm_dlc_link(s, d);
1472
1473 rfcomm_apply_pn(d, cr, pn);
1474
1475 d->state = BT_OPEN;
1476 rfcomm_send_pn(s, 0, d);
1477 } else {
1478 rfcomm_send_dm(s, dlci);
1479 }
1480 }
1481 return 0;
1482}
1483
1484static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb)
1485{
1486 struct rfcomm_rpn *rpn = (void *) skb->data;
1487 u8 dlci = __get_dlci(rpn->dlci);
1488
1489 u8 bit_rate = 0;
1490 u8 data_bits = 0;
1491 u8 stop_bits = 0;
1492 u8 parity = 0;
1493 u8 flow_ctrl = 0;
1494 u8 xon_char = 0;
1495 u8 xoff_char = 0;
1496 u16 rpn_mask = RFCOMM_RPN_PM_ALL;
1497
1498 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",
1499 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl,
1500 rpn->xon_char, rpn->xoff_char, rpn->param_mask);
1501
1502 if (!cr)
1503 return 0;
1504
1505 if (len == 1) {
1506 /* This is a request, return default (according to ETSI TS 07.10) settings */
1507 bit_rate = RFCOMM_RPN_BR_9600;
1508 data_bits = RFCOMM_RPN_DATA_8;
1509 stop_bits = RFCOMM_RPN_STOP_1;
1510 parity = RFCOMM_RPN_PARITY_NONE;
1511 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1512 xon_char = RFCOMM_RPN_XON_CHAR;
1513 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1514 goto rpn_out;
1515 }
1516
1517 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
1518 * no parity, no flow control lines, normal XON/XOFF chars */
1519
1520 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
1521 bit_rate = rpn->bit_rate;
1522 if (bit_rate > RFCOMM_RPN_BR_230400) {
1523 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
1524 bit_rate = RFCOMM_RPN_BR_9600;
1525 rpn_mask ^= RFCOMM_RPN_PM_BITRATE;
1526 }
1527 }
1528
1529 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
1530 data_bits = __get_rpn_data_bits(rpn->line_settings);
1531 if (data_bits != RFCOMM_RPN_DATA_8) {
1532 BT_DBG("RPN data bits mismatch 0x%x", data_bits);
1533 data_bits = RFCOMM_RPN_DATA_8;
1534 rpn_mask ^= RFCOMM_RPN_PM_DATA;
1535 }
1536 }
1537
1538 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
1539 stop_bits = __get_rpn_stop_bits(rpn->line_settings);
1540 if (stop_bits != RFCOMM_RPN_STOP_1) {
1541 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits);
1542 stop_bits = RFCOMM_RPN_STOP_1;
1543 rpn_mask ^= RFCOMM_RPN_PM_STOP;
1544 }
1545 }
1546
1547 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
1548 parity = __get_rpn_parity(rpn->line_settings);
1549 if (parity != RFCOMM_RPN_PARITY_NONE) {
1550 BT_DBG("RPN parity mismatch 0x%x", parity);
1551 parity = RFCOMM_RPN_PARITY_NONE;
1552 rpn_mask ^= RFCOMM_RPN_PM_PARITY;
1553 }
1554 }
1555
1556 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
1557 flow_ctrl = rpn->flow_ctrl;
1558 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
1559 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl);
1560 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1561 rpn_mask ^= RFCOMM_RPN_PM_FLOW;
1562 }
1563 }
1564
1565 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
1566 xon_char = rpn->xon_char;
1567 if (xon_char != RFCOMM_RPN_XON_CHAR) {
1568 BT_DBG("RPN XON char mismatch 0x%x", xon_char);
1569 xon_char = RFCOMM_RPN_XON_CHAR;
1570 rpn_mask ^= RFCOMM_RPN_PM_XON;
1571 }
1572 }
1573
1574 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
1575 xoff_char = rpn->xoff_char;
1576 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
1577 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char);
1578 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1579 rpn_mask ^= RFCOMM_RPN_PM_XOFF;
1580 }
1581 }
1582
1583rpn_out:
1584 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
1585 parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
1586
1587 return 0;
1588}
1589
1590static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1591{
1592 struct rfcomm_rls *rls = (void *) skb->data;
1593 u8 dlci = __get_dlci(rls->dlci);
1594
1595 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status);
1596
1597 if (!cr)
1598 return 0;
1599
1600 /* We should probably do something with this information here. But
1601 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's
1602 * mandatory to recognise and respond to RLS */
1603
1604 rfcomm_send_rls(s, 0, dlci, rls->status);
1605
1606 return 0;
1607}
1608
1609static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1610{
1611 struct rfcomm_msc *msc = (void *) skb->data;
1612 struct rfcomm_dlc *d;
1613 u8 dlci = __get_dlci(msc->dlci);
1614
1615 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig);
1616
1617 d = rfcomm_dlc_get(s, dlci);
1618 if (!d)
1619 return 0;
1620
1621 if (cr) {
1622 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
1623 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1624 else
1625 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1626
1627 rfcomm_dlc_lock(d);
1628
1629 d->remote_v24_sig = msc->v24_sig;
1630
1631 if (d->modem_status)
1632 d->modem_status(d, msc->v24_sig);
1633
1634 rfcomm_dlc_unlock(d);
1635
1636 rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
1637
1638 d->mscex |= RFCOMM_MSCEX_RX;
1639 } else
1640 d->mscex |= RFCOMM_MSCEX_TX;
1641
1642 return 0;
1643}
1644
1645static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb)
1646{
1647 struct rfcomm_mcc *mcc = (void *) skb->data;
1648 u8 type, cr, len;
1649
1650 cr = __test_cr(mcc->type);
1651 type = __get_mcc_type(mcc->type);
1652 len = __get_mcc_len(mcc->len);
1653
1654 BT_DBG("%p type 0x%x cr %d", s, type, cr);
1655
1656 skb_pull(skb, 2);
1657
1658 switch (type) {
1659 case RFCOMM_PN:
1660 rfcomm_recv_pn(s, cr, skb);
1661 break;
1662
1663 case RFCOMM_RPN:
1664 rfcomm_recv_rpn(s, cr, len, skb);
1665 break;
1666
1667 case RFCOMM_RLS:
1668 rfcomm_recv_rls(s, cr, skb);
1669 break;
1670
1671 case RFCOMM_MSC:
1672 rfcomm_recv_msc(s, cr, skb);
1673 break;
1674
1675 case RFCOMM_FCOFF:
1676 if (cr) {
1677 set_bit(RFCOMM_TX_THROTTLED, &s->flags);
1678 rfcomm_send_fcoff(s, 0);
1679 }
1680 break;
1681
1682 case RFCOMM_FCON:
1683 if (cr) {
1684 clear_bit(RFCOMM_TX_THROTTLED, &s->flags);
1685 rfcomm_send_fcon(s, 0);
1686 }
1687 break;
1688
1689 case RFCOMM_TEST:
1690 if (cr)
1691 rfcomm_send_test(s, 0, skb->data, skb->len);
1692 break;
1693
1694 case RFCOMM_NSC:
1695 break;
1696
1697 default:
1698 BT_ERR("Unknown control type 0x%02x", type);
1699 rfcomm_send_nsc(s, cr, type);
1700 break;
1701 }
1702 return 0;
1703}
1704
1705static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb)
1706{
1707 struct rfcomm_dlc *d;
1708
1709 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf);
1710
1711 d = rfcomm_dlc_get(s, dlci);
1712 if (!d) {
1713 rfcomm_send_dm(s, dlci);
1714 goto drop;
1715 }
1716
1717 if (pf && d->cfc) {
1718 u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);
1719
1720 d->tx_credits += credits;
1721 if (d->tx_credits)
1722 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1723 }
1724
1725 if (skb->len && d->state == BT_CONNECTED) {
1726 rfcomm_dlc_lock(d);
1727 d->rx_credits--;
1728 d->data_ready(d, skb);
1729 rfcomm_dlc_unlock(d);
1730 return 0;
1731 }
1732
1733drop:
1734 kfree_skb(skb);
1735 return 0;
1736}
1737
1738static struct rfcomm_session *rfcomm_recv_frame(struct rfcomm_session *s,
1739 struct sk_buff *skb)
1740{
1741 struct rfcomm_hdr *hdr = (void *) skb->data;
1742 u8 type, dlci, fcs;
1743
1744 if (!s) {
1745 /* no session, so free socket data */
1746 kfree_skb(skb);
1747 return s;
1748 }
1749
1750 dlci = __get_dlci(hdr->addr);
1751 type = __get_type(hdr->ctrl);
1752
1753 /* Trim FCS */
1754 skb->len--; skb->tail--;
1755 fcs = *(u8 *)skb_tail_pointer(skb);
1756
1757 if (__check_fcs(skb->data, type, fcs)) {
1758 BT_ERR("bad checksum in packet");
1759 kfree_skb(skb);
1760 return s;
1761 }
1762
1763 if (__test_ea(hdr->len))
1764 skb_pull(skb, 3);
1765 else
1766 skb_pull(skb, 4);
1767
1768 switch (type) {
1769 case RFCOMM_SABM:
1770 if (__test_pf(hdr->ctrl))
1771 rfcomm_recv_sabm(s, dlci);
1772 break;
1773
1774 case RFCOMM_DISC:
1775 if (__test_pf(hdr->ctrl))
1776 s = rfcomm_recv_disc(s, dlci);
1777 break;
1778
1779 case RFCOMM_UA:
1780 if (__test_pf(hdr->ctrl))
1781 s = rfcomm_recv_ua(s, dlci);
1782 break;
1783
1784 case RFCOMM_DM:
1785 s = rfcomm_recv_dm(s, dlci);
1786 break;
1787
1788 case RFCOMM_UIH:
1789 if (dlci) {
1790 rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
1791 return s;
1792 }
1793 rfcomm_recv_mcc(s, skb);
1794 break;
1795
1796 default:
1797 BT_ERR("Unknown packet type 0x%02x", type);
1798 break;
1799 }
1800 kfree_skb(skb);
1801 return s;
1802}
1803
1804/* ---- Connection and data processing ---- */
1805
1806static void rfcomm_process_connect(struct rfcomm_session *s)
1807{
1808 struct rfcomm_dlc *d, *n;
1809
1810 BT_DBG("session %p state %ld", s, s->state);
1811
1812 list_for_each_entry_safe(d, n, &s->dlcs, list) {
1813 if (d->state == BT_CONFIG) {
1814 d->mtu = s->mtu;
1815 if (rfcomm_check_security(d)) {
1816 rfcomm_send_pn(s, 1, d);
1817 } else {
1818 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1819 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1820 }
1821 }
1822 }
1823}
1824
1825/* Send data queued for the DLC.
1826 * Return number of frames left in the queue.
1827 */
1828static int rfcomm_process_tx(struct rfcomm_dlc *d)
1829{
1830 struct sk_buff *skb;
1831 int err;
1832
1833 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
1834 d, d->state, d->cfc, d->rx_credits, d->tx_credits);
1835
1836 /* Send pending MSC */
1837 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
1838 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1839
1840 if (d->cfc) {
1841 /* CFC enabled.
1842 * Give them some credits */
1843 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
1844 d->rx_credits <= (d->cfc >> 2)) {
1845 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits);
1846 d->rx_credits = d->cfc;
1847 }
1848 } else {
1849 /* CFC disabled.
1850 * Give ourselves some credits */
1851 d->tx_credits = 5;
1852 }
1853
1854 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags))
1855 return skb_queue_len(&d->tx_queue);
1856
1857 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) {
1858 err = rfcomm_send_frame(d->session, skb->data, skb->len);
1859 if (err < 0) {
1860 skb_queue_head(&d->tx_queue, skb);
1861 break;
1862 }
1863 kfree_skb(skb);
1864 d->tx_credits--;
1865 }
1866
1867 if (d->cfc && !d->tx_credits) {
1868 /* We're out of TX credits.
1869 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
1870 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1871 }
1872
1873 return skb_queue_len(&d->tx_queue);
1874}
1875
1876static void rfcomm_process_dlcs(struct rfcomm_session *s)
1877{
1878 struct rfcomm_dlc *d, *n;
1879
1880 BT_DBG("session %p state %ld", s, s->state);
1881
1882 list_for_each_entry_safe(d, n, &s->dlcs, list) {
1883 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
1884 __rfcomm_dlc_close(d, ETIMEDOUT);
1885 continue;
1886 }
1887
1888 if (test_bit(RFCOMM_ENC_DROP, &d->flags)) {
1889 __rfcomm_dlc_close(d, ECONNREFUSED);
1890 continue;
1891 }
1892
1893 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) {
1894 rfcomm_dlc_clear_timer(d);
1895 if (d->out) {
1896 rfcomm_send_pn(s, 1, d);
1897 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
1898 } else {
1899 if (d->defer_setup) {
1900 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1901 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1902
1903 rfcomm_dlc_lock(d);
1904 d->state = BT_CONNECT2;
1905 d->state_change(d, 0);
1906 rfcomm_dlc_unlock(d);
1907 } else
1908 rfcomm_dlc_accept(d);
1909 }
1910 continue;
1911 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
1912 rfcomm_dlc_clear_timer(d);
1913 if (!d->out)
1914 rfcomm_send_dm(s, d->dlci);
1915 else
1916 d->state = BT_CLOSED;
1917 __rfcomm_dlc_close(d, ECONNREFUSED);
1918 continue;
1919 }
1920
1921 if (test_bit(RFCOMM_SEC_PENDING, &d->flags))
1922 continue;
1923
1924 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
1925 continue;
1926
1927 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
1928 d->mscex == RFCOMM_MSCEX_OK)
1929 rfcomm_process_tx(d);
1930 }
1931}
1932
1933static struct rfcomm_session *rfcomm_process_rx(struct rfcomm_session *s)
1934{
1935 struct socket *sock = s->sock;
1936 struct sock *sk = sock->sk;
1937 struct sk_buff *skb;
1938
1939 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue));
1940
1941 /* Get data directly from socket receive queue without copying it. */
1942 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
1943 skb_orphan(skb);
1944 if (!skb_linearize(skb) && sk->sk_state != BT_CLOSED) {
1945 s = rfcomm_recv_frame(s, skb);
1946 if (!s)
1947 break;
1948 } else {
1949 kfree_skb(skb);
1950 }
1951 }
1952
1953 if (s && (sk->sk_state == BT_CLOSED))
1954 s = rfcomm_session_close(s, sk->sk_err);
1955
1956 return s;
1957}
1958
1959static void rfcomm_accept_connection(struct rfcomm_session *s)
1960{
1961 struct socket *sock = s->sock, *nsock;
1962 int err;
1963
1964 /* Fast check for a new connection.
1965 * Avoids unnesesary socket allocations. */
1966 if (list_empty(&bt_sk(sock->sk)->accept_q))
1967 return;
1968
1969 BT_DBG("session %p", s);
1970
1971 err = kernel_accept(sock, &nsock, O_NONBLOCK);
1972 if (err < 0)
1973 return;
1974
1975 /* Set our callbacks */
1976 nsock->sk->sk_data_ready = rfcomm_l2data_ready;
1977 nsock->sk->sk_state_change = rfcomm_l2state_change;
1978
1979 s = rfcomm_session_add(nsock, BT_OPEN);
1980 if (s) {
1981 /* We should adjust MTU on incoming sessions.
1982 * L2CAP MTU minus UIH header and FCS. */
1983 s->mtu = min(l2cap_pi(nsock->sk)->chan->omtu,
1984 l2cap_pi(nsock->sk)->chan->imtu) - 5;
1985
1986 rfcomm_schedule();
1987 } else
1988 sock_release(nsock);
1989}
1990
1991static struct rfcomm_session *rfcomm_check_connection(struct rfcomm_session *s)
1992{
1993 struct sock *sk = s->sock->sk;
1994
1995 BT_DBG("%p state %ld", s, s->state);
1996
1997 switch (sk->sk_state) {
1998 case BT_CONNECTED:
1999 s->state = BT_CONNECT;
2000
2001 /* We can adjust MTU on outgoing sessions.
2002 * L2CAP MTU minus UIH header and FCS. */
2003 s->mtu = min(l2cap_pi(sk)->chan->omtu, l2cap_pi(sk)->chan->imtu) - 5;
2004
2005 rfcomm_send_sabm(s, 0);
2006 break;
2007
2008 case BT_CLOSED:
2009 s = rfcomm_session_close(s, sk->sk_err);
2010 break;
2011 }
2012 return s;
2013}
2014
2015static void rfcomm_process_sessions(void)
2016{
2017 struct rfcomm_session *s, *n;
2018
2019 rfcomm_lock();
2020
2021 list_for_each_entry_safe(s, n, &session_list, list) {
2022 if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
2023 s->state = BT_DISCONN;
2024 rfcomm_send_disc(s, 0);
2025 continue;
2026 }
2027
2028 switch (s->state) {
2029 case BT_LISTEN:
2030 rfcomm_accept_connection(s);
2031 continue;
2032
2033 case BT_BOUND:
2034 s = rfcomm_check_connection(s);
2035 break;
2036
2037 default:
2038 s = rfcomm_process_rx(s);
2039 break;
2040 }
2041
2042 if (s)
2043 rfcomm_process_dlcs(s);
2044 }
2045
2046 rfcomm_unlock();
2047}
2048
2049static int rfcomm_add_listener(bdaddr_t *ba)
2050{
2051 struct sockaddr_l2 addr;
2052 struct socket *sock;
2053 struct sock *sk;
2054 struct rfcomm_session *s;
2055 int err = 0;
2056
2057 /* Create socket */
2058 err = rfcomm_l2sock_create(&sock);
2059 if (err < 0) {
2060 BT_ERR("Create socket failed %d", err);
2061 return err;
2062 }
2063
2064 /* Bind socket */
2065 bacpy(&addr.l2_bdaddr, ba);
2066 addr.l2_family = AF_BLUETOOTH;
2067 addr.l2_psm = cpu_to_le16(L2CAP_PSM_RFCOMM);
2068 addr.l2_cid = 0;
2069 addr.l2_bdaddr_type = BDADDR_BREDR;
2070 err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
2071 if (err < 0) {
2072 BT_ERR("Bind failed %d", err);
2073 goto failed;
2074 }
2075
2076 /* Set L2CAP options */
2077 sk = sock->sk;
2078 lock_sock(sk);
2079 /* Set MTU to 0 so L2CAP can auto select the MTU */
2080 l2cap_pi(sk)->chan->imtu = 0;
2081 release_sock(sk);
2082
2083 /* Start listening on the socket */
2084 err = kernel_listen(sock, 10);
2085 if (err) {
2086 BT_ERR("Listen failed %d", err);
2087 goto failed;
2088 }
2089
2090 /* Add listening session */
2091 s = rfcomm_session_add(sock, BT_LISTEN);
2092 if (!s) {
2093 err = -ENOMEM;
2094 goto failed;
2095 }
2096
2097 return 0;
2098failed:
2099 sock_release(sock);
2100 return err;
2101}
2102
2103static void rfcomm_kill_listener(void)
2104{
2105 struct rfcomm_session *s, *n;
2106
2107 BT_DBG("");
2108
2109 list_for_each_entry_safe(s, n, &session_list, list)
2110 rfcomm_session_del(s);
2111}
2112
2113static int rfcomm_run(void *unused)
2114{
2115 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2116 BT_DBG("");
2117
2118 set_user_nice(current, -10);
2119
2120 rfcomm_add_listener(BDADDR_ANY);
2121
2122 add_wait_queue(&rfcomm_wq, &wait);
2123 while (!kthread_should_stop()) {
2124
2125 /* Process stuff */
2126 rfcomm_process_sessions();
2127
2128 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
2129 }
2130 remove_wait_queue(&rfcomm_wq, &wait);
2131
2132 rfcomm_kill_listener();
2133
2134 return 0;
2135}
2136
2137static bool rfcomm_match(struct hci_conn *hcon)
2138{
2139 return hcon->type == ACL_LINK;
2140}
2141
2142static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
2143{
2144 struct rfcomm_session *s;
2145 struct rfcomm_dlc *d, *n;
2146
2147 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);
2148
2149 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
2150 if (!s)
2151 return;
2152
2153 list_for_each_entry_safe(d, n, &s->dlcs, list) {
2154 if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) {
2155 rfcomm_dlc_clear_timer(d);
2156 if (status || encrypt == 0x00) {
2157 set_bit(RFCOMM_ENC_DROP, &d->flags);
2158 continue;
2159 }
2160 }
2161
2162 if (d->state == BT_CONNECTED && !status && encrypt == 0x00) {
2163 if (d->sec_level == BT_SECURITY_MEDIUM) {
2164 set_bit(RFCOMM_SEC_PENDING, &d->flags);
2165 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
2166 continue;
2167 } else if (d->sec_level == BT_SECURITY_HIGH ||
2168 d->sec_level == BT_SECURITY_FIPS) {
2169 set_bit(RFCOMM_ENC_DROP, &d->flags);
2170 continue;
2171 }
2172 }
2173
2174 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
2175 continue;
2176
2177 if (!status && hci_conn_check_secure(conn, d->sec_level))
2178 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
2179 else
2180 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
2181 }
2182
2183 rfcomm_schedule();
2184}
2185
2186static struct hci_cb rfcomm_cb = {
2187 .name = "RFCOMM",
2188 .match = rfcomm_match,
2189 .security_cfm = rfcomm_security_cfm
2190};
2191
2192static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x)
2193{
2194 struct rfcomm_session *s;
2195
2196 rfcomm_lock();
2197
2198 list_for_each_entry(s, &session_list, list) {
2199 struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan;
2200 struct rfcomm_dlc *d;
2201 list_for_each_entry(d, &s->dlcs, list) {
2202 seq_printf(f, "%pMR %pMR %ld %d %d %d %d\n",
2203 &chan->src, &chan->dst,
2204 d->state, d->dlci, d->mtu,
2205 d->rx_credits, d->tx_credits);
2206 }
2207 }
2208
2209 rfcomm_unlock();
2210
2211 return 0;
2212}
2213
2214DEFINE_SHOW_ATTRIBUTE(rfcomm_dlc_debugfs);
2215
2216static struct dentry *rfcomm_dlc_debugfs;
2217
2218/* ---- Initialization ---- */
2219static int __init rfcomm_init(void)
2220{
2221 int err;
2222
2223 hci_register_cb(&rfcomm_cb);
2224
2225 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
2226 if (IS_ERR(rfcomm_thread)) {
2227 err = PTR_ERR(rfcomm_thread);
2228 goto unregister;
2229 }
2230
2231 err = rfcomm_init_ttys();
2232 if (err < 0)
2233 goto stop;
2234
2235 err = rfcomm_init_sockets();
2236 if (err < 0)
2237 goto cleanup;
2238
2239 BT_INFO("RFCOMM ver %s", VERSION);
2240
2241 if (IS_ERR_OR_NULL(bt_debugfs))
2242 return 0;
2243
2244 rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444,
2245 bt_debugfs, NULL,
2246 &rfcomm_dlc_debugfs_fops);
2247
2248 return 0;
2249
2250cleanup:
2251 rfcomm_cleanup_ttys();
2252
2253stop:
2254 kthread_stop(rfcomm_thread);
2255
2256unregister:
2257 hci_unregister_cb(&rfcomm_cb);
2258
2259 return err;
2260}
2261
2262static void __exit rfcomm_exit(void)
2263{
2264 debugfs_remove(rfcomm_dlc_debugfs);
2265
2266 hci_unregister_cb(&rfcomm_cb);
2267
2268 kthread_stop(rfcomm_thread);
2269
2270 rfcomm_cleanup_ttys();
2271
2272 rfcomm_cleanup_sockets();
2273}
2274
2275module_init(rfcomm_init);
2276module_exit(rfcomm_exit);
2277
2278module_param(disable_cfc, bool, 0644);
2279MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
2280
2281module_param(channel_mtu, int, 0644);
2282MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
2283
2284module_param(l2cap_ertm, bool, 0644);
2285MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection");
2286
2287MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
2288MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
2289MODULE_VERSION(VERSION);
2290MODULE_LICENSE("GPL");
2291MODULE_ALIAS("bt-proto-3");
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/debugfs.h>
30#include <linux/kthread.h>
31#include <asm/unaligned.h>
32
33#include <net/bluetooth/bluetooth.h>
34#include <net/bluetooth/hci_core.h>
35#include <net/bluetooth/l2cap.h>
36#include <net/bluetooth/rfcomm.h>
37
38#define VERSION "1.11"
39
40static bool disable_cfc;
41static bool l2cap_ertm;
42static int channel_mtu = -1;
43static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
44
45static struct task_struct *rfcomm_thread;
46
47static DEFINE_MUTEX(rfcomm_mutex);
48#define rfcomm_lock() mutex_lock(&rfcomm_mutex)
49#define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
50
51
52static LIST_HEAD(session_list);
53
54static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
55static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
56static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
57static int rfcomm_queue_disc(struct rfcomm_dlc *d);
58static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
59static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
60static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
61static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
62static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
63static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
64
65static void rfcomm_process_connect(struct rfcomm_session *s);
66
67static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
68 bdaddr_t *dst,
69 u8 sec_level,
70 int *err);
71static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
72static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s);
73
74/* ---- RFCOMM frame parsing macros ---- */
75#define __get_dlci(b) ((b & 0xfc) >> 2)
76#define __get_channel(b) ((b & 0xf8) >> 3)
77#define __get_dir(b) ((b & 0x04) >> 2)
78#define __get_type(b) ((b & 0xef))
79
80#define __test_ea(b) ((b & 0x01))
81#define __test_cr(b) ((b & 0x02))
82#define __test_pf(b) ((b & 0x10))
83
84#define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
85#define __ctrl(type, pf) (((type & 0xef) | (pf << 4)))
86#define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir)
87#define __srv_channel(dlci) (dlci >> 1)
88#define __dir(dlci) (dlci & 0x01)
89
90#define __len8(len) (((len) << 1) | 1)
91#define __len16(len) ((len) << 1)
92
93/* MCC macros */
94#define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01))
95#define __get_mcc_type(b) ((b & 0xfc) >> 2)
96#define __get_mcc_len(b) ((b & 0xfe) >> 1)
97
98/* RPN macros */
99#define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
100#define __get_rpn_data_bits(line) ((line) & 0x3)
101#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
102#define __get_rpn_parity(line) (((line) >> 3) & 0x7)
103
104static void rfcomm_schedule(void)
105{
106 if (!rfcomm_thread)
107 return;
108 wake_up_process(rfcomm_thread);
109}
110
111/* ---- RFCOMM FCS computation ---- */
112
113/* reversed, 8-bit, poly=0x07 */
114static unsigned char rfcomm_crc_table[256] = {
115 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
116 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
117 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
118 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
119
120 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
121 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
122 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
123 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
124
125 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
126 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
127 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
128 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
129
130 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
131 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
132 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
133 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
134
135 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
136 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
137 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
138 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
139
140 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
141 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
142 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
143 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
144
145 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
146 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
147 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
148 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
149
150 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
151 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
152 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
153 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
154};
155
156/* CRC on 2 bytes */
157#define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
158
159/* FCS on 2 bytes */
160static inline u8 __fcs(u8 *data)
161{
162 return 0xff - __crc(data);
163}
164
165/* FCS on 3 bytes */
166static inline u8 __fcs2(u8 *data)
167{
168 return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]];
169}
170
171/* Check FCS */
172static inline int __check_fcs(u8 *data, int type, u8 fcs)
173{
174 u8 f = __crc(data);
175
176 if (type != RFCOMM_UIH)
177 f = rfcomm_crc_table[f ^ data[2]];
178
179 return rfcomm_crc_table[f ^ fcs] != 0xcf;
180}
181
182/* ---- L2CAP callbacks ---- */
183static void rfcomm_l2state_change(struct sock *sk)
184{
185 BT_DBG("%p state %d", sk, sk->sk_state);
186 rfcomm_schedule();
187}
188
189static void rfcomm_l2data_ready(struct sock *sk)
190{
191 BT_DBG("%p", sk);
192 rfcomm_schedule();
193}
194
195static int rfcomm_l2sock_create(struct socket **sock)
196{
197 int err;
198
199 BT_DBG("");
200
201 err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
202 if (!err) {
203 struct sock *sk = (*sock)->sk;
204 sk->sk_data_ready = rfcomm_l2data_ready;
205 sk->sk_state_change = rfcomm_l2state_change;
206 }
207 return err;
208}
209
210static int rfcomm_check_security(struct rfcomm_dlc *d)
211{
212 struct sock *sk = d->session->sock->sk;
213 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
214
215 __u8 auth_type;
216
217 switch (d->sec_level) {
218 case BT_SECURITY_HIGH:
219 case BT_SECURITY_FIPS:
220 auth_type = HCI_AT_GENERAL_BONDING_MITM;
221 break;
222 case BT_SECURITY_MEDIUM:
223 auth_type = HCI_AT_GENERAL_BONDING;
224 break;
225 default:
226 auth_type = HCI_AT_NO_BONDING;
227 break;
228 }
229
230 return hci_conn_security(conn->hcon, d->sec_level, auth_type);
231}
232
233static void rfcomm_session_timeout(unsigned long arg)
234{
235 struct rfcomm_session *s = (void *) arg;
236
237 BT_DBG("session %p state %ld", s, s->state);
238
239 set_bit(RFCOMM_TIMED_OUT, &s->flags);
240 rfcomm_schedule();
241}
242
243static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout)
244{
245 BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout);
246
247 mod_timer(&s->timer, jiffies + timeout);
248}
249
250static void rfcomm_session_clear_timer(struct rfcomm_session *s)
251{
252 BT_DBG("session %p state %ld", s, s->state);
253
254 del_timer_sync(&s->timer);
255}
256
257/* ---- RFCOMM DLCs ---- */
258static void rfcomm_dlc_timeout(unsigned long arg)
259{
260 struct rfcomm_dlc *d = (void *) arg;
261
262 BT_DBG("dlc %p state %ld", d, d->state);
263
264 set_bit(RFCOMM_TIMED_OUT, &d->flags);
265 rfcomm_dlc_put(d);
266 rfcomm_schedule();
267}
268
269static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
270{
271 BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);
272
273 if (!mod_timer(&d->timer, jiffies + timeout))
274 rfcomm_dlc_hold(d);
275}
276
277static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
278{
279 BT_DBG("dlc %p state %ld", d, d->state);
280
281 if (del_timer(&d->timer))
282 rfcomm_dlc_put(d);
283}
284
285static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
286{
287 BT_DBG("%p", d);
288
289 d->state = BT_OPEN;
290 d->flags = 0;
291 d->mscex = 0;
292 d->sec_level = BT_SECURITY_LOW;
293 d->mtu = RFCOMM_DEFAULT_MTU;
294 d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV;
295
296 d->cfc = RFCOMM_CFC_DISABLED;
297 d->rx_credits = RFCOMM_DEFAULT_CREDITS;
298}
299
300struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
301{
302 struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);
303
304 if (!d)
305 return NULL;
306
307 setup_timer(&d->timer, rfcomm_dlc_timeout, (unsigned long)d);
308
309 skb_queue_head_init(&d->tx_queue);
310 spin_lock_init(&d->lock);
311 atomic_set(&d->refcnt, 1);
312
313 rfcomm_dlc_clear_state(d);
314
315 BT_DBG("%p", d);
316
317 return d;
318}
319
320void rfcomm_dlc_free(struct rfcomm_dlc *d)
321{
322 BT_DBG("%p", d);
323
324 skb_queue_purge(&d->tx_queue);
325 kfree(d);
326}
327
328static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
329{
330 BT_DBG("dlc %p session %p", d, s);
331
332 rfcomm_session_clear_timer(s);
333 rfcomm_dlc_hold(d);
334 list_add(&d->list, &s->dlcs);
335 d->session = s;
336}
337
338static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
339{
340 struct rfcomm_session *s = d->session;
341
342 BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s);
343
344 list_del(&d->list);
345 d->session = NULL;
346 rfcomm_dlc_put(d);
347
348 if (list_empty(&s->dlcs))
349 rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT);
350}
351
352static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
353{
354 struct rfcomm_dlc *d;
355
356 list_for_each_entry(d, &s->dlcs, list)
357 if (d->dlci == dlci)
358 return d;
359
360 return NULL;
361}
362
363static int rfcomm_check_channel(u8 channel)
364{
365 return channel < 1 || channel > 30;
366}
367
368static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
369{
370 struct rfcomm_session *s;
371 int err = 0;
372 u8 dlci;
373
374 BT_DBG("dlc %p state %ld %pMR -> %pMR channel %d",
375 d, d->state, src, dst, channel);
376
377 if (rfcomm_check_channel(channel))
378 return -EINVAL;
379
380 if (d->state != BT_OPEN && d->state != BT_CLOSED)
381 return 0;
382
383 s = rfcomm_session_get(src, dst);
384 if (!s) {
385 s = rfcomm_session_create(src, dst, d->sec_level, &err);
386 if (!s)
387 return err;
388 }
389
390 dlci = __dlci(!s->initiator, channel);
391
392 /* Check if DLCI already exists */
393 if (rfcomm_dlc_get(s, dlci))
394 return -EBUSY;
395
396 rfcomm_dlc_clear_state(d);
397
398 d->dlci = dlci;
399 d->addr = __addr(s->initiator, dlci);
400 d->priority = 7;
401
402 d->state = BT_CONFIG;
403 rfcomm_dlc_link(s, d);
404
405 d->out = 1;
406
407 d->mtu = s->mtu;
408 d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;
409
410 if (s->state == BT_CONNECTED) {
411 if (rfcomm_check_security(d))
412 rfcomm_send_pn(s, 1, d);
413 else
414 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
415 }
416
417 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
418
419 return 0;
420}
421
422int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
423{
424 int r;
425
426 rfcomm_lock();
427
428 r = __rfcomm_dlc_open(d, src, dst, channel);
429
430 rfcomm_unlock();
431 return r;
432}
433
434static void __rfcomm_dlc_disconn(struct rfcomm_dlc *d)
435{
436 struct rfcomm_session *s = d->session;
437
438 d->state = BT_DISCONN;
439 if (skb_queue_empty(&d->tx_queue)) {
440 rfcomm_send_disc(s, d->dlci);
441 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
442 } else {
443 rfcomm_queue_disc(d);
444 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
445 }
446}
447
448static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
449{
450 struct rfcomm_session *s = d->session;
451 if (!s)
452 return 0;
453
454 BT_DBG("dlc %p state %ld dlci %d err %d session %p",
455 d, d->state, d->dlci, err, s);
456
457 switch (d->state) {
458 case BT_CONNECT:
459 case BT_CONFIG:
460 case BT_OPEN:
461 case BT_CONNECT2:
462 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
463 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
464 rfcomm_schedule();
465 return 0;
466 }
467 }
468
469 switch (d->state) {
470 case BT_CONNECT:
471 case BT_CONNECTED:
472 __rfcomm_dlc_disconn(d);
473 break;
474
475 case BT_CONFIG:
476 if (s->state != BT_BOUND) {
477 __rfcomm_dlc_disconn(d);
478 break;
479 }
480 /* if closing a dlc in a session that hasn't been started,
481 * just close and unlink the dlc
482 */
483
484 default:
485 rfcomm_dlc_clear_timer(d);
486
487 rfcomm_dlc_lock(d);
488 d->state = BT_CLOSED;
489 d->state_change(d, err);
490 rfcomm_dlc_unlock(d);
491
492 skb_queue_purge(&d->tx_queue);
493 rfcomm_dlc_unlink(d);
494 }
495
496 return 0;
497}
498
499int rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
500{
501 int r = 0;
502 struct rfcomm_dlc *d_list;
503 struct rfcomm_session *s, *s_list;
504
505 BT_DBG("dlc %p state %ld dlci %d err %d", d, d->state, d->dlci, err);
506
507 rfcomm_lock();
508
509 s = d->session;
510 if (!s)
511 goto no_session;
512
513 /* after waiting on the mutex check the session still exists
514 * then check the dlc still exists
515 */
516 list_for_each_entry(s_list, &session_list, list) {
517 if (s_list == s) {
518 list_for_each_entry(d_list, &s->dlcs, list) {
519 if (d_list == d) {
520 r = __rfcomm_dlc_close(d, err);
521 break;
522 }
523 }
524 break;
525 }
526 }
527
528no_session:
529 rfcomm_unlock();
530 return r;
531}
532
533struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel)
534{
535 struct rfcomm_session *s;
536 struct rfcomm_dlc *dlc = NULL;
537 u8 dlci;
538
539 if (rfcomm_check_channel(channel))
540 return ERR_PTR(-EINVAL);
541
542 rfcomm_lock();
543 s = rfcomm_session_get(src, dst);
544 if (s) {
545 dlci = __dlci(!s->initiator, channel);
546 dlc = rfcomm_dlc_get(s, dlci);
547 }
548 rfcomm_unlock();
549 return dlc;
550}
551
552int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
553{
554 int len = skb->len;
555
556 if (d->state != BT_CONNECTED)
557 return -ENOTCONN;
558
559 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
560
561 if (len > d->mtu)
562 return -EINVAL;
563
564 rfcomm_make_uih(skb, d->addr);
565 skb_queue_tail(&d->tx_queue, skb);
566
567 if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
568 rfcomm_schedule();
569 return len;
570}
571
572void rfcomm_dlc_send_noerror(struct rfcomm_dlc *d, struct sk_buff *skb)
573{
574 int len = skb->len;
575
576 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
577
578 rfcomm_make_uih(skb, d->addr);
579 skb_queue_tail(&d->tx_queue, skb);
580
581 if (d->state == BT_CONNECTED &&
582 !test_bit(RFCOMM_TX_THROTTLED, &d->flags))
583 rfcomm_schedule();
584}
585
586void __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
587{
588 BT_DBG("dlc %p state %ld", d, d->state);
589
590 if (!d->cfc) {
591 d->v24_sig |= RFCOMM_V24_FC;
592 set_bit(RFCOMM_MSC_PENDING, &d->flags);
593 }
594 rfcomm_schedule();
595}
596
597void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
598{
599 BT_DBG("dlc %p state %ld", d, d->state);
600
601 if (!d->cfc) {
602 d->v24_sig &= ~RFCOMM_V24_FC;
603 set_bit(RFCOMM_MSC_PENDING, &d->flags);
604 }
605 rfcomm_schedule();
606}
607
608/*
609 Set/get modem status functions use _local_ status i.e. what we report
610 to the other side.
611 Remote status is provided by dlc->modem_status() callback.
612 */
613int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig)
614{
615 BT_DBG("dlc %p state %ld v24_sig 0x%x",
616 d, d->state, v24_sig);
617
618 if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
619 v24_sig |= RFCOMM_V24_FC;
620 else
621 v24_sig &= ~RFCOMM_V24_FC;
622
623 d->v24_sig = v24_sig;
624
625 if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags))
626 rfcomm_schedule();
627
628 return 0;
629}
630
631int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig)
632{
633 BT_DBG("dlc %p state %ld v24_sig 0x%x",
634 d, d->state, d->v24_sig);
635
636 *v24_sig = d->v24_sig;
637 return 0;
638}
639
640/* ---- RFCOMM sessions ---- */
641static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
642{
643 struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL);
644
645 if (!s)
646 return NULL;
647
648 BT_DBG("session %p sock %p", s, sock);
649
650 setup_timer(&s->timer, rfcomm_session_timeout, (unsigned long) s);
651
652 INIT_LIST_HEAD(&s->dlcs);
653 s->state = state;
654 s->sock = sock;
655
656 s->mtu = RFCOMM_DEFAULT_MTU;
657 s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;
658
659 /* Do not increment module usage count for listening sessions.
660 * Otherwise we won't be able to unload the module. */
661 if (state != BT_LISTEN)
662 if (!try_module_get(THIS_MODULE)) {
663 kfree(s);
664 return NULL;
665 }
666
667 list_add(&s->list, &session_list);
668
669 return s;
670}
671
672static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s)
673{
674 int state = s->state;
675
676 BT_DBG("session %p state %ld", s, s->state);
677
678 list_del(&s->list);
679
680 rfcomm_session_clear_timer(s);
681 sock_release(s->sock);
682 kfree(s);
683
684 if (state != BT_LISTEN)
685 module_put(THIS_MODULE);
686
687 return NULL;
688}
689
690static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst)
691{
692 struct rfcomm_session *s;
693 struct list_head *p, *n;
694 struct l2cap_chan *chan;
695 list_for_each_safe(p, n, &session_list) {
696 s = list_entry(p, struct rfcomm_session, list);
697 chan = l2cap_pi(s->sock->sk)->chan;
698
699 if ((!bacmp(src, BDADDR_ANY) || !bacmp(&chan->src, src)) &&
700 !bacmp(&chan->dst, dst))
701 return s;
702 }
703 return NULL;
704}
705
706static struct rfcomm_session *rfcomm_session_close(struct rfcomm_session *s,
707 int err)
708{
709 struct rfcomm_dlc *d;
710 struct list_head *p, *n;
711
712 s->state = BT_CLOSED;
713
714 BT_DBG("session %p state %ld err %d", s, s->state, err);
715
716 /* Close all dlcs */
717 list_for_each_safe(p, n, &s->dlcs) {
718 d = list_entry(p, struct rfcomm_dlc, list);
719 d->state = BT_CLOSED;
720 __rfcomm_dlc_close(d, err);
721 }
722
723 rfcomm_session_clear_timer(s);
724 return rfcomm_session_del(s);
725}
726
727static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
728 bdaddr_t *dst,
729 u8 sec_level,
730 int *err)
731{
732 struct rfcomm_session *s = NULL;
733 struct sockaddr_l2 addr;
734 struct socket *sock;
735 struct sock *sk;
736
737 BT_DBG("%pMR -> %pMR", src, dst);
738
739 *err = rfcomm_l2sock_create(&sock);
740 if (*err < 0)
741 return NULL;
742
743 bacpy(&addr.l2_bdaddr, src);
744 addr.l2_family = AF_BLUETOOTH;
745 addr.l2_psm = 0;
746 addr.l2_cid = 0;
747 addr.l2_bdaddr_type = BDADDR_BREDR;
748 *err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
749 if (*err < 0)
750 goto failed;
751
752 /* Set L2CAP options */
753 sk = sock->sk;
754 lock_sock(sk);
755 l2cap_pi(sk)->chan->imtu = l2cap_mtu;
756 l2cap_pi(sk)->chan->sec_level = sec_level;
757 if (l2cap_ertm)
758 l2cap_pi(sk)->chan->mode = L2CAP_MODE_ERTM;
759 release_sock(sk);
760
761 s = rfcomm_session_add(sock, BT_BOUND);
762 if (!s) {
763 *err = -ENOMEM;
764 goto failed;
765 }
766
767 s->initiator = 1;
768
769 bacpy(&addr.l2_bdaddr, dst);
770 addr.l2_family = AF_BLUETOOTH;
771 addr.l2_psm = cpu_to_le16(RFCOMM_PSM);
772 addr.l2_cid = 0;
773 addr.l2_bdaddr_type = BDADDR_BREDR;
774 *err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
775 if (*err == 0 || *err == -EINPROGRESS)
776 return s;
777
778 return rfcomm_session_del(s);
779
780failed:
781 sock_release(sock);
782 return NULL;
783}
784
785void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst)
786{
787 struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan;
788 if (src)
789 bacpy(src, &chan->src);
790 if (dst)
791 bacpy(dst, &chan->dst);
792}
793
794/* ---- RFCOMM frame sending ---- */
795static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len)
796{
797 struct kvec iv = { data, len };
798 struct msghdr msg;
799
800 BT_DBG("session %p len %d", s, len);
801
802 memset(&msg, 0, sizeof(msg));
803
804 return kernel_sendmsg(s->sock, &msg, &iv, 1, len);
805}
806
807static int rfcomm_send_cmd(struct rfcomm_session *s, struct rfcomm_cmd *cmd)
808{
809 BT_DBG("%p cmd %u", s, cmd->ctrl);
810
811 return rfcomm_send_frame(s, (void *) cmd, sizeof(*cmd));
812}
813
814static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci)
815{
816 struct rfcomm_cmd cmd;
817
818 BT_DBG("%p dlci %d", s, dlci);
819
820 cmd.addr = __addr(s->initiator, dlci);
821 cmd.ctrl = __ctrl(RFCOMM_SABM, 1);
822 cmd.len = __len8(0);
823 cmd.fcs = __fcs2((u8 *) &cmd);
824
825 return rfcomm_send_cmd(s, &cmd);
826}
827
828static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci)
829{
830 struct rfcomm_cmd cmd;
831
832 BT_DBG("%p dlci %d", s, dlci);
833
834 cmd.addr = __addr(!s->initiator, dlci);
835 cmd.ctrl = __ctrl(RFCOMM_UA, 1);
836 cmd.len = __len8(0);
837 cmd.fcs = __fcs2((u8 *) &cmd);
838
839 return rfcomm_send_cmd(s, &cmd);
840}
841
842static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci)
843{
844 struct rfcomm_cmd cmd;
845
846 BT_DBG("%p dlci %d", s, dlci);
847
848 cmd.addr = __addr(s->initiator, dlci);
849 cmd.ctrl = __ctrl(RFCOMM_DISC, 1);
850 cmd.len = __len8(0);
851 cmd.fcs = __fcs2((u8 *) &cmd);
852
853 return rfcomm_send_cmd(s, &cmd);
854}
855
856static int rfcomm_queue_disc(struct rfcomm_dlc *d)
857{
858 struct rfcomm_cmd *cmd;
859 struct sk_buff *skb;
860
861 BT_DBG("dlc %p dlci %d", d, d->dlci);
862
863 skb = alloc_skb(sizeof(*cmd), GFP_KERNEL);
864 if (!skb)
865 return -ENOMEM;
866
867 cmd = (void *) __skb_put(skb, sizeof(*cmd));
868 cmd->addr = d->addr;
869 cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
870 cmd->len = __len8(0);
871 cmd->fcs = __fcs2((u8 *) cmd);
872
873 skb_queue_tail(&d->tx_queue, skb);
874 rfcomm_schedule();
875 return 0;
876}
877
878static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci)
879{
880 struct rfcomm_cmd cmd;
881
882 BT_DBG("%p dlci %d", s, dlci);
883
884 cmd.addr = __addr(!s->initiator, dlci);
885 cmd.ctrl = __ctrl(RFCOMM_DM, 1);
886 cmd.len = __len8(0);
887 cmd.fcs = __fcs2((u8 *) &cmd);
888
889 return rfcomm_send_cmd(s, &cmd);
890}
891
892static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type)
893{
894 struct rfcomm_hdr *hdr;
895 struct rfcomm_mcc *mcc;
896 u8 buf[16], *ptr = buf;
897
898 BT_DBG("%p cr %d type %d", s, cr, type);
899
900 hdr = (void *) ptr; ptr += sizeof(*hdr);
901 hdr->addr = __addr(s->initiator, 0);
902 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
903 hdr->len = __len8(sizeof(*mcc) + 1);
904
905 mcc = (void *) ptr; ptr += sizeof(*mcc);
906 mcc->type = __mcc_type(cr, RFCOMM_NSC);
907 mcc->len = __len8(1);
908
909 /* Type that we didn't like */
910 *ptr = __mcc_type(cr, type); ptr++;
911
912 *ptr = __fcs(buf); ptr++;
913
914 return rfcomm_send_frame(s, buf, ptr - buf);
915}
916
917static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d)
918{
919 struct rfcomm_hdr *hdr;
920 struct rfcomm_mcc *mcc;
921 struct rfcomm_pn *pn;
922 u8 buf[16], *ptr = buf;
923
924 BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu);
925
926 hdr = (void *) ptr; ptr += sizeof(*hdr);
927 hdr->addr = __addr(s->initiator, 0);
928 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
929 hdr->len = __len8(sizeof(*mcc) + sizeof(*pn));
930
931 mcc = (void *) ptr; ptr += sizeof(*mcc);
932 mcc->type = __mcc_type(cr, RFCOMM_PN);
933 mcc->len = __len8(sizeof(*pn));
934
935 pn = (void *) ptr; ptr += sizeof(*pn);
936 pn->dlci = d->dlci;
937 pn->priority = d->priority;
938 pn->ack_timer = 0;
939 pn->max_retrans = 0;
940
941 if (s->cfc) {
942 pn->flow_ctrl = cr ? 0xf0 : 0xe0;
943 pn->credits = RFCOMM_DEFAULT_CREDITS;
944 } else {
945 pn->flow_ctrl = 0;
946 pn->credits = 0;
947 }
948
949 if (cr && channel_mtu >= 0)
950 pn->mtu = cpu_to_le16(channel_mtu);
951 else
952 pn->mtu = cpu_to_le16(d->mtu);
953
954 *ptr = __fcs(buf); ptr++;
955
956 return rfcomm_send_frame(s, buf, ptr - buf);
957}
958
959int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
960 u8 bit_rate, u8 data_bits, u8 stop_bits,
961 u8 parity, u8 flow_ctrl_settings,
962 u8 xon_char, u8 xoff_char, u16 param_mask)
963{
964 struct rfcomm_hdr *hdr;
965 struct rfcomm_mcc *mcc;
966 struct rfcomm_rpn *rpn;
967 u8 buf[16], *ptr = buf;
968
969 BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x"
970 " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x",
971 s, cr, dlci, bit_rate, data_bits, stop_bits, parity,
972 flow_ctrl_settings, xon_char, xoff_char, param_mask);
973
974 hdr = (void *) ptr; ptr += sizeof(*hdr);
975 hdr->addr = __addr(s->initiator, 0);
976 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
977 hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn));
978
979 mcc = (void *) ptr; ptr += sizeof(*mcc);
980 mcc->type = __mcc_type(cr, RFCOMM_RPN);
981 mcc->len = __len8(sizeof(*rpn));
982
983 rpn = (void *) ptr; ptr += sizeof(*rpn);
984 rpn->dlci = __addr(1, dlci);
985 rpn->bit_rate = bit_rate;
986 rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity);
987 rpn->flow_ctrl = flow_ctrl_settings;
988 rpn->xon_char = xon_char;
989 rpn->xoff_char = xoff_char;
990 rpn->param_mask = cpu_to_le16(param_mask);
991
992 *ptr = __fcs(buf); ptr++;
993
994 return rfcomm_send_frame(s, buf, ptr - buf);
995}
996
997static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status)
998{
999 struct rfcomm_hdr *hdr;
1000 struct rfcomm_mcc *mcc;
1001 struct rfcomm_rls *rls;
1002 u8 buf[16], *ptr = buf;
1003
1004 BT_DBG("%p cr %d status 0x%x", s, cr, status);
1005
1006 hdr = (void *) ptr; ptr += sizeof(*hdr);
1007 hdr->addr = __addr(s->initiator, 0);
1008 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1009 hdr->len = __len8(sizeof(*mcc) + sizeof(*rls));
1010
1011 mcc = (void *) ptr; ptr += sizeof(*mcc);
1012 mcc->type = __mcc_type(cr, RFCOMM_RLS);
1013 mcc->len = __len8(sizeof(*rls));
1014
1015 rls = (void *) ptr; ptr += sizeof(*rls);
1016 rls->dlci = __addr(1, dlci);
1017 rls->status = status;
1018
1019 *ptr = __fcs(buf); ptr++;
1020
1021 return rfcomm_send_frame(s, buf, ptr - buf);
1022}
1023
1024static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig)
1025{
1026 struct rfcomm_hdr *hdr;
1027 struct rfcomm_mcc *mcc;
1028 struct rfcomm_msc *msc;
1029 u8 buf[16], *ptr = buf;
1030
1031 BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig);
1032
1033 hdr = (void *) ptr; ptr += sizeof(*hdr);
1034 hdr->addr = __addr(s->initiator, 0);
1035 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1036 hdr->len = __len8(sizeof(*mcc) + sizeof(*msc));
1037
1038 mcc = (void *) ptr; ptr += sizeof(*mcc);
1039 mcc->type = __mcc_type(cr, RFCOMM_MSC);
1040 mcc->len = __len8(sizeof(*msc));
1041
1042 msc = (void *) ptr; ptr += sizeof(*msc);
1043 msc->dlci = __addr(1, dlci);
1044 msc->v24_sig = v24_sig | 0x01;
1045
1046 *ptr = __fcs(buf); ptr++;
1047
1048 return rfcomm_send_frame(s, buf, ptr - buf);
1049}
1050
1051static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr)
1052{
1053 struct rfcomm_hdr *hdr;
1054 struct rfcomm_mcc *mcc;
1055 u8 buf[16], *ptr = buf;
1056
1057 BT_DBG("%p cr %d", s, cr);
1058
1059 hdr = (void *) ptr; ptr += sizeof(*hdr);
1060 hdr->addr = __addr(s->initiator, 0);
1061 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1062 hdr->len = __len8(sizeof(*mcc));
1063
1064 mcc = (void *) ptr; ptr += sizeof(*mcc);
1065 mcc->type = __mcc_type(cr, RFCOMM_FCOFF);
1066 mcc->len = __len8(0);
1067
1068 *ptr = __fcs(buf); ptr++;
1069
1070 return rfcomm_send_frame(s, buf, ptr - buf);
1071}
1072
1073static int rfcomm_send_fcon(struct rfcomm_session *s, int cr)
1074{
1075 struct rfcomm_hdr *hdr;
1076 struct rfcomm_mcc *mcc;
1077 u8 buf[16], *ptr = buf;
1078
1079 BT_DBG("%p cr %d", s, cr);
1080
1081 hdr = (void *) ptr; ptr += sizeof(*hdr);
1082 hdr->addr = __addr(s->initiator, 0);
1083 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1084 hdr->len = __len8(sizeof(*mcc));
1085
1086 mcc = (void *) ptr; ptr += sizeof(*mcc);
1087 mcc->type = __mcc_type(cr, RFCOMM_FCON);
1088 mcc->len = __len8(0);
1089
1090 *ptr = __fcs(buf); ptr++;
1091
1092 return rfcomm_send_frame(s, buf, ptr - buf);
1093}
1094
1095static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len)
1096{
1097 struct socket *sock = s->sock;
1098 struct kvec iv[3];
1099 struct msghdr msg;
1100 unsigned char hdr[5], crc[1];
1101
1102 if (len > 125)
1103 return -EINVAL;
1104
1105 BT_DBG("%p cr %d", s, cr);
1106
1107 hdr[0] = __addr(s->initiator, 0);
1108 hdr[1] = __ctrl(RFCOMM_UIH, 0);
1109 hdr[2] = 0x01 | ((len + 2) << 1);
1110 hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2);
1111 hdr[4] = 0x01 | (len << 1);
1112
1113 crc[0] = __fcs(hdr);
1114
1115 iv[0].iov_base = hdr;
1116 iv[0].iov_len = 5;
1117 iv[1].iov_base = pattern;
1118 iv[1].iov_len = len;
1119 iv[2].iov_base = crc;
1120 iv[2].iov_len = 1;
1121
1122 memset(&msg, 0, sizeof(msg));
1123
1124 return kernel_sendmsg(sock, &msg, iv, 3, 6 + len);
1125}
1126
1127static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits)
1128{
1129 struct rfcomm_hdr *hdr;
1130 u8 buf[16], *ptr = buf;
1131
1132 BT_DBG("%p addr %d credits %d", s, addr, credits);
1133
1134 hdr = (void *) ptr; ptr += sizeof(*hdr);
1135 hdr->addr = addr;
1136 hdr->ctrl = __ctrl(RFCOMM_UIH, 1);
1137 hdr->len = __len8(0);
1138
1139 *ptr = credits; ptr++;
1140
1141 *ptr = __fcs(buf); ptr++;
1142
1143 return rfcomm_send_frame(s, buf, ptr - buf);
1144}
1145
1146static void rfcomm_make_uih(struct sk_buff *skb, u8 addr)
1147{
1148 struct rfcomm_hdr *hdr;
1149 int len = skb->len;
1150 u8 *crc;
1151
1152 if (len > 127) {
1153 hdr = (void *) skb_push(skb, 4);
1154 put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len);
1155 } else {
1156 hdr = (void *) skb_push(skb, 3);
1157 hdr->len = __len8(len);
1158 }
1159 hdr->addr = addr;
1160 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1161
1162 crc = skb_put(skb, 1);
1163 *crc = __fcs((void *) hdr);
1164}
1165
1166/* ---- RFCOMM frame reception ---- */
1167static struct rfcomm_session *rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci)
1168{
1169 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1170
1171 if (dlci) {
1172 /* Data channel */
1173 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1174 if (!d) {
1175 rfcomm_send_dm(s, dlci);
1176 return s;
1177 }
1178
1179 switch (d->state) {
1180 case BT_CONNECT:
1181 rfcomm_dlc_clear_timer(d);
1182
1183 rfcomm_dlc_lock(d);
1184 d->state = BT_CONNECTED;
1185 d->state_change(d, 0);
1186 rfcomm_dlc_unlock(d);
1187
1188 rfcomm_send_msc(s, 1, dlci, d->v24_sig);
1189 break;
1190
1191 case BT_DISCONN:
1192 d->state = BT_CLOSED;
1193 __rfcomm_dlc_close(d, 0);
1194
1195 if (list_empty(&s->dlcs)) {
1196 s->state = BT_DISCONN;
1197 rfcomm_send_disc(s, 0);
1198 rfcomm_session_clear_timer(s);
1199 }
1200
1201 break;
1202 }
1203 } else {
1204 /* Control channel */
1205 switch (s->state) {
1206 case BT_CONNECT:
1207 s->state = BT_CONNECTED;
1208 rfcomm_process_connect(s);
1209 break;
1210
1211 case BT_DISCONN:
1212 s = rfcomm_session_close(s, ECONNRESET);
1213 break;
1214 }
1215 }
1216 return s;
1217}
1218
1219static struct rfcomm_session *rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci)
1220{
1221 int err = 0;
1222
1223 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1224
1225 if (dlci) {
1226 /* Data DLC */
1227 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1228 if (d) {
1229 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1230 err = ECONNREFUSED;
1231 else
1232 err = ECONNRESET;
1233
1234 d->state = BT_CLOSED;
1235 __rfcomm_dlc_close(d, err);
1236 }
1237 } else {
1238 if (s->state == BT_CONNECT)
1239 err = ECONNREFUSED;
1240 else
1241 err = ECONNRESET;
1242
1243 s = rfcomm_session_close(s, err);
1244 }
1245 return s;
1246}
1247
1248static struct rfcomm_session *rfcomm_recv_disc(struct rfcomm_session *s,
1249 u8 dlci)
1250{
1251 int err = 0;
1252
1253 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1254
1255 if (dlci) {
1256 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1257 if (d) {
1258 rfcomm_send_ua(s, dlci);
1259
1260 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1261 err = ECONNREFUSED;
1262 else
1263 err = ECONNRESET;
1264
1265 d->state = BT_CLOSED;
1266 __rfcomm_dlc_close(d, err);
1267 } else
1268 rfcomm_send_dm(s, dlci);
1269
1270 } else {
1271 rfcomm_send_ua(s, 0);
1272
1273 if (s->state == BT_CONNECT)
1274 err = ECONNREFUSED;
1275 else
1276 err = ECONNRESET;
1277
1278 s = rfcomm_session_close(s, err);
1279 }
1280 return s;
1281}
1282
1283void rfcomm_dlc_accept(struct rfcomm_dlc *d)
1284{
1285 struct sock *sk = d->session->sock->sk;
1286 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
1287
1288 BT_DBG("dlc %p", d);
1289
1290 rfcomm_send_ua(d->session, d->dlci);
1291
1292 rfcomm_dlc_clear_timer(d);
1293
1294 rfcomm_dlc_lock(d);
1295 d->state = BT_CONNECTED;
1296 d->state_change(d, 0);
1297 rfcomm_dlc_unlock(d);
1298
1299 if (d->role_switch)
1300 hci_conn_switch_role(conn->hcon, 0x00);
1301
1302 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1303}
1304
1305static void rfcomm_check_accept(struct rfcomm_dlc *d)
1306{
1307 if (rfcomm_check_security(d)) {
1308 if (d->defer_setup) {
1309 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1310 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1311
1312 rfcomm_dlc_lock(d);
1313 d->state = BT_CONNECT2;
1314 d->state_change(d, 0);
1315 rfcomm_dlc_unlock(d);
1316 } else
1317 rfcomm_dlc_accept(d);
1318 } else {
1319 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1320 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1321 }
1322}
1323
1324static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
1325{
1326 struct rfcomm_dlc *d;
1327 u8 channel;
1328
1329 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1330
1331 if (!dlci) {
1332 rfcomm_send_ua(s, 0);
1333
1334 if (s->state == BT_OPEN) {
1335 s->state = BT_CONNECTED;
1336 rfcomm_process_connect(s);
1337 }
1338 return 0;
1339 }
1340
1341 /* Check if DLC exists */
1342 d = rfcomm_dlc_get(s, dlci);
1343 if (d) {
1344 if (d->state == BT_OPEN) {
1345 /* DLC was previously opened by PN request */
1346 rfcomm_check_accept(d);
1347 }
1348 return 0;
1349 }
1350
1351 /* Notify socket layer about incoming connection */
1352 channel = __srv_channel(dlci);
1353 if (rfcomm_connect_ind(s, channel, &d)) {
1354 d->dlci = dlci;
1355 d->addr = __addr(s->initiator, dlci);
1356 rfcomm_dlc_link(s, d);
1357
1358 rfcomm_check_accept(d);
1359 } else {
1360 rfcomm_send_dm(s, dlci);
1361 }
1362
1363 return 0;
1364}
1365
1366static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
1367{
1368 struct rfcomm_session *s = d->session;
1369
1370 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
1371 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);
1372
1373 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
1374 pn->flow_ctrl == 0xe0) {
1375 d->cfc = RFCOMM_CFC_ENABLED;
1376 d->tx_credits = pn->credits;
1377 } else {
1378 d->cfc = RFCOMM_CFC_DISABLED;
1379 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1380 }
1381
1382 if (s->cfc == RFCOMM_CFC_UNKNOWN)
1383 s->cfc = d->cfc;
1384
1385 d->priority = pn->priority;
1386
1387 d->mtu = __le16_to_cpu(pn->mtu);
1388
1389 if (cr && d->mtu > s->mtu)
1390 d->mtu = s->mtu;
1391
1392 return 0;
1393}
1394
1395static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1396{
1397 struct rfcomm_pn *pn = (void *) skb->data;
1398 struct rfcomm_dlc *d;
1399 u8 dlci = pn->dlci;
1400
1401 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1402
1403 if (!dlci)
1404 return 0;
1405
1406 d = rfcomm_dlc_get(s, dlci);
1407 if (d) {
1408 if (cr) {
1409 /* PN request */
1410 rfcomm_apply_pn(d, cr, pn);
1411 rfcomm_send_pn(s, 0, d);
1412 } else {
1413 /* PN response */
1414 switch (d->state) {
1415 case BT_CONFIG:
1416 rfcomm_apply_pn(d, cr, pn);
1417
1418 d->state = BT_CONNECT;
1419 rfcomm_send_sabm(s, d->dlci);
1420 break;
1421 }
1422 }
1423 } else {
1424 u8 channel = __srv_channel(dlci);
1425
1426 if (!cr)
1427 return 0;
1428
1429 /* PN request for non existing DLC.
1430 * Assume incoming connection. */
1431 if (rfcomm_connect_ind(s, channel, &d)) {
1432 d->dlci = dlci;
1433 d->addr = __addr(s->initiator, dlci);
1434 rfcomm_dlc_link(s, d);
1435
1436 rfcomm_apply_pn(d, cr, pn);
1437
1438 d->state = BT_OPEN;
1439 rfcomm_send_pn(s, 0, d);
1440 } else {
1441 rfcomm_send_dm(s, dlci);
1442 }
1443 }
1444 return 0;
1445}
1446
1447static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb)
1448{
1449 struct rfcomm_rpn *rpn = (void *) skb->data;
1450 u8 dlci = __get_dlci(rpn->dlci);
1451
1452 u8 bit_rate = 0;
1453 u8 data_bits = 0;
1454 u8 stop_bits = 0;
1455 u8 parity = 0;
1456 u8 flow_ctrl = 0;
1457 u8 xon_char = 0;
1458 u8 xoff_char = 0;
1459 u16 rpn_mask = RFCOMM_RPN_PM_ALL;
1460
1461 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",
1462 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl,
1463 rpn->xon_char, rpn->xoff_char, rpn->param_mask);
1464
1465 if (!cr)
1466 return 0;
1467
1468 if (len == 1) {
1469 /* This is a request, return default (according to ETSI TS 07.10) settings */
1470 bit_rate = RFCOMM_RPN_BR_9600;
1471 data_bits = RFCOMM_RPN_DATA_8;
1472 stop_bits = RFCOMM_RPN_STOP_1;
1473 parity = RFCOMM_RPN_PARITY_NONE;
1474 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1475 xon_char = RFCOMM_RPN_XON_CHAR;
1476 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1477 goto rpn_out;
1478 }
1479
1480 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
1481 * no parity, no flow control lines, normal XON/XOFF chars */
1482
1483 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
1484 bit_rate = rpn->bit_rate;
1485 if (bit_rate > RFCOMM_RPN_BR_230400) {
1486 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
1487 bit_rate = RFCOMM_RPN_BR_9600;
1488 rpn_mask ^= RFCOMM_RPN_PM_BITRATE;
1489 }
1490 }
1491
1492 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
1493 data_bits = __get_rpn_data_bits(rpn->line_settings);
1494 if (data_bits != RFCOMM_RPN_DATA_8) {
1495 BT_DBG("RPN data bits mismatch 0x%x", data_bits);
1496 data_bits = RFCOMM_RPN_DATA_8;
1497 rpn_mask ^= RFCOMM_RPN_PM_DATA;
1498 }
1499 }
1500
1501 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
1502 stop_bits = __get_rpn_stop_bits(rpn->line_settings);
1503 if (stop_bits != RFCOMM_RPN_STOP_1) {
1504 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits);
1505 stop_bits = RFCOMM_RPN_STOP_1;
1506 rpn_mask ^= RFCOMM_RPN_PM_STOP;
1507 }
1508 }
1509
1510 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
1511 parity = __get_rpn_parity(rpn->line_settings);
1512 if (parity != RFCOMM_RPN_PARITY_NONE) {
1513 BT_DBG("RPN parity mismatch 0x%x", parity);
1514 parity = RFCOMM_RPN_PARITY_NONE;
1515 rpn_mask ^= RFCOMM_RPN_PM_PARITY;
1516 }
1517 }
1518
1519 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
1520 flow_ctrl = rpn->flow_ctrl;
1521 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
1522 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl);
1523 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1524 rpn_mask ^= RFCOMM_RPN_PM_FLOW;
1525 }
1526 }
1527
1528 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
1529 xon_char = rpn->xon_char;
1530 if (xon_char != RFCOMM_RPN_XON_CHAR) {
1531 BT_DBG("RPN XON char mismatch 0x%x", xon_char);
1532 xon_char = RFCOMM_RPN_XON_CHAR;
1533 rpn_mask ^= RFCOMM_RPN_PM_XON;
1534 }
1535 }
1536
1537 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
1538 xoff_char = rpn->xoff_char;
1539 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
1540 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char);
1541 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1542 rpn_mask ^= RFCOMM_RPN_PM_XOFF;
1543 }
1544 }
1545
1546rpn_out:
1547 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
1548 parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
1549
1550 return 0;
1551}
1552
1553static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1554{
1555 struct rfcomm_rls *rls = (void *) skb->data;
1556 u8 dlci = __get_dlci(rls->dlci);
1557
1558 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status);
1559
1560 if (!cr)
1561 return 0;
1562
1563 /* We should probably do something with this information here. But
1564 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's
1565 * mandatory to recognise and respond to RLS */
1566
1567 rfcomm_send_rls(s, 0, dlci, rls->status);
1568
1569 return 0;
1570}
1571
1572static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1573{
1574 struct rfcomm_msc *msc = (void *) skb->data;
1575 struct rfcomm_dlc *d;
1576 u8 dlci = __get_dlci(msc->dlci);
1577
1578 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig);
1579
1580 d = rfcomm_dlc_get(s, dlci);
1581 if (!d)
1582 return 0;
1583
1584 if (cr) {
1585 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
1586 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1587 else
1588 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1589
1590 rfcomm_dlc_lock(d);
1591
1592 d->remote_v24_sig = msc->v24_sig;
1593
1594 if (d->modem_status)
1595 d->modem_status(d, msc->v24_sig);
1596
1597 rfcomm_dlc_unlock(d);
1598
1599 rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
1600
1601 d->mscex |= RFCOMM_MSCEX_RX;
1602 } else
1603 d->mscex |= RFCOMM_MSCEX_TX;
1604
1605 return 0;
1606}
1607
1608static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb)
1609{
1610 struct rfcomm_mcc *mcc = (void *) skb->data;
1611 u8 type, cr, len;
1612
1613 cr = __test_cr(mcc->type);
1614 type = __get_mcc_type(mcc->type);
1615 len = __get_mcc_len(mcc->len);
1616
1617 BT_DBG("%p type 0x%x cr %d", s, type, cr);
1618
1619 skb_pull(skb, 2);
1620
1621 switch (type) {
1622 case RFCOMM_PN:
1623 rfcomm_recv_pn(s, cr, skb);
1624 break;
1625
1626 case RFCOMM_RPN:
1627 rfcomm_recv_rpn(s, cr, len, skb);
1628 break;
1629
1630 case RFCOMM_RLS:
1631 rfcomm_recv_rls(s, cr, skb);
1632 break;
1633
1634 case RFCOMM_MSC:
1635 rfcomm_recv_msc(s, cr, skb);
1636 break;
1637
1638 case RFCOMM_FCOFF:
1639 if (cr) {
1640 set_bit(RFCOMM_TX_THROTTLED, &s->flags);
1641 rfcomm_send_fcoff(s, 0);
1642 }
1643 break;
1644
1645 case RFCOMM_FCON:
1646 if (cr) {
1647 clear_bit(RFCOMM_TX_THROTTLED, &s->flags);
1648 rfcomm_send_fcon(s, 0);
1649 }
1650 break;
1651
1652 case RFCOMM_TEST:
1653 if (cr)
1654 rfcomm_send_test(s, 0, skb->data, skb->len);
1655 break;
1656
1657 case RFCOMM_NSC:
1658 break;
1659
1660 default:
1661 BT_ERR("Unknown control type 0x%02x", type);
1662 rfcomm_send_nsc(s, cr, type);
1663 break;
1664 }
1665 return 0;
1666}
1667
1668static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb)
1669{
1670 struct rfcomm_dlc *d;
1671
1672 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf);
1673
1674 d = rfcomm_dlc_get(s, dlci);
1675 if (!d) {
1676 rfcomm_send_dm(s, dlci);
1677 goto drop;
1678 }
1679
1680 if (pf && d->cfc) {
1681 u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);
1682
1683 d->tx_credits += credits;
1684 if (d->tx_credits)
1685 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1686 }
1687
1688 if (skb->len && d->state == BT_CONNECTED) {
1689 rfcomm_dlc_lock(d);
1690 d->rx_credits--;
1691 d->data_ready(d, skb);
1692 rfcomm_dlc_unlock(d);
1693 return 0;
1694 }
1695
1696drop:
1697 kfree_skb(skb);
1698 return 0;
1699}
1700
1701static struct rfcomm_session *rfcomm_recv_frame(struct rfcomm_session *s,
1702 struct sk_buff *skb)
1703{
1704 struct rfcomm_hdr *hdr = (void *) skb->data;
1705 u8 type, dlci, fcs;
1706
1707 if (!s) {
1708 /* no session, so free socket data */
1709 kfree_skb(skb);
1710 return s;
1711 }
1712
1713 dlci = __get_dlci(hdr->addr);
1714 type = __get_type(hdr->ctrl);
1715
1716 /* Trim FCS */
1717 skb->len--; skb->tail--;
1718 fcs = *(u8 *)skb_tail_pointer(skb);
1719
1720 if (__check_fcs(skb->data, type, fcs)) {
1721 BT_ERR("bad checksum in packet");
1722 kfree_skb(skb);
1723 return s;
1724 }
1725
1726 if (__test_ea(hdr->len))
1727 skb_pull(skb, 3);
1728 else
1729 skb_pull(skb, 4);
1730
1731 switch (type) {
1732 case RFCOMM_SABM:
1733 if (__test_pf(hdr->ctrl))
1734 rfcomm_recv_sabm(s, dlci);
1735 break;
1736
1737 case RFCOMM_DISC:
1738 if (__test_pf(hdr->ctrl))
1739 s = rfcomm_recv_disc(s, dlci);
1740 break;
1741
1742 case RFCOMM_UA:
1743 if (__test_pf(hdr->ctrl))
1744 s = rfcomm_recv_ua(s, dlci);
1745 break;
1746
1747 case RFCOMM_DM:
1748 s = rfcomm_recv_dm(s, dlci);
1749 break;
1750
1751 case RFCOMM_UIH:
1752 if (dlci) {
1753 rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
1754 return s;
1755 }
1756 rfcomm_recv_mcc(s, skb);
1757 break;
1758
1759 default:
1760 BT_ERR("Unknown packet type 0x%02x", type);
1761 break;
1762 }
1763 kfree_skb(skb);
1764 return s;
1765}
1766
1767/* ---- Connection and data processing ---- */
1768
1769static void rfcomm_process_connect(struct rfcomm_session *s)
1770{
1771 struct rfcomm_dlc *d;
1772 struct list_head *p, *n;
1773
1774 BT_DBG("session %p state %ld", s, s->state);
1775
1776 list_for_each_safe(p, n, &s->dlcs) {
1777 d = list_entry(p, struct rfcomm_dlc, list);
1778 if (d->state == BT_CONFIG) {
1779 d->mtu = s->mtu;
1780 if (rfcomm_check_security(d)) {
1781 rfcomm_send_pn(s, 1, d);
1782 } else {
1783 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1784 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1785 }
1786 }
1787 }
1788}
1789
1790/* Send data queued for the DLC.
1791 * Return number of frames left in the queue.
1792 */
1793static int rfcomm_process_tx(struct rfcomm_dlc *d)
1794{
1795 struct sk_buff *skb;
1796 int err;
1797
1798 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
1799 d, d->state, d->cfc, d->rx_credits, d->tx_credits);
1800
1801 /* Send pending MSC */
1802 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
1803 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1804
1805 if (d->cfc) {
1806 /* CFC enabled.
1807 * Give them some credits */
1808 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
1809 d->rx_credits <= (d->cfc >> 2)) {
1810 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits);
1811 d->rx_credits = d->cfc;
1812 }
1813 } else {
1814 /* CFC disabled.
1815 * Give ourselves some credits */
1816 d->tx_credits = 5;
1817 }
1818
1819 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags))
1820 return skb_queue_len(&d->tx_queue);
1821
1822 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) {
1823 err = rfcomm_send_frame(d->session, skb->data, skb->len);
1824 if (err < 0) {
1825 skb_queue_head(&d->tx_queue, skb);
1826 break;
1827 }
1828 kfree_skb(skb);
1829 d->tx_credits--;
1830 }
1831
1832 if (d->cfc && !d->tx_credits) {
1833 /* We're out of TX credits.
1834 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
1835 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1836 }
1837
1838 return skb_queue_len(&d->tx_queue);
1839}
1840
1841static void rfcomm_process_dlcs(struct rfcomm_session *s)
1842{
1843 struct rfcomm_dlc *d;
1844 struct list_head *p, *n;
1845
1846 BT_DBG("session %p state %ld", s, s->state);
1847
1848 list_for_each_safe(p, n, &s->dlcs) {
1849 d = list_entry(p, struct rfcomm_dlc, list);
1850
1851 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
1852 __rfcomm_dlc_close(d, ETIMEDOUT);
1853 continue;
1854 }
1855
1856 if (test_bit(RFCOMM_ENC_DROP, &d->flags)) {
1857 __rfcomm_dlc_close(d, ECONNREFUSED);
1858 continue;
1859 }
1860
1861 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) {
1862 rfcomm_dlc_clear_timer(d);
1863 if (d->out) {
1864 rfcomm_send_pn(s, 1, d);
1865 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
1866 } else {
1867 if (d->defer_setup) {
1868 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1869 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1870
1871 rfcomm_dlc_lock(d);
1872 d->state = BT_CONNECT2;
1873 d->state_change(d, 0);
1874 rfcomm_dlc_unlock(d);
1875 } else
1876 rfcomm_dlc_accept(d);
1877 }
1878 continue;
1879 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
1880 rfcomm_dlc_clear_timer(d);
1881 if (!d->out)
1882 rfcomm_send_dm(s, d->dlci);
1883 else
1884 d->state = BT_CLOSED;
1885 __rfcomm_dlc_close(d, ECONNREFUSED);
1886 continue;
1887 }
1888
1889 if (test_bit(RFCOMM_SEC_PENDING, &d->flags))
1890 continue;
1891
1892 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
1893 continue;
1894
1895 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
1896 d->mscex == RFCOMM_MSCEX_OK)
1897 rfcomm_process_tx(d);
1898 }
1899}
1900
1901static struct rfcomm_session *rfcomm_process_rx(struct rfcomm_session *s)
1902{
1903 struct socket *sock = s->sock;
1904 struct sock *sk = sock->sk;
1905 struct sk_buff *skb;
1906
1907 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue));
1908
1909 /* Get data directly from socket receive queue without copying it. */
1910 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
1911 skb_orphan(skb);
1912 if (!skb_linearize(skb))
1913 s = rfcomm_recv_frame(s, skb);
1914 else
1915 kfree_skb(skb);
1916 }
1917
1918 if (s && (sk->sk_state == BT_CLOSED))
1919 s = rfcomm_session_close(s, sk->sk_err);
1920
1921 return s;
1922}
1923
1924static void rfcomm_accept_connection(struct rfcomm_session *s)
1925{
1926 struct socket *sock = s->sock, *nsock;
1927 int err;
1928
1929 /* Fast check for a new connection.
1930 * Avoids unnesesary socket allocations. */
1931 if (list_empty(&bt_sk(sock->sk)->accept_q))
1932 return;
1933
1934 BT_DBG("session %p", s);
1935
1936 err = kernel_accept(sock, &nsock, O_NONBLOCK);
1937 if (err < 0)
1938 return;
1939
1940 /* Set our callbacks */
1941 nsock->sk->sk_data_ready = rfcomm_l2data_ready;
1942 nsock->sk->sk_state_change = rfcomm_l2state_change;
1943
1944 s = rfcomm_session_add(nsock, BT_OPEN);
1945 if (s) {
1946 /* We should adjust MTU on incoming sessions.
1947 * L2CAP MTU minus UIH header and FCS. */
1948 s->mtu = min(l2cap_pi(nsock->sk)->chan->omtu,
1949 l2cap_pi(nsock->sk)->chan->imtu) - 5;
1950
1951 rfcomm_schedule();
1952 } else
1953 sock_release(nsock);
1954}
1955
1956static struct rfcomm_session *rfcomm_check_connection(struct rfcomm_session *s)
1957{
1958 struct sock *sk = s->sock->sk;
1959
1960 BT_DBG("%p state %ld", s, s->state);
1961
1962 switch (sk->sk_state) {
1963 case BT_CONNECTED:
1964 s->state = BT_CONNECT;
1965
1966 /* We can adjust MTU on outgoing sessions.
1967 * L2CAP MTU minus UIH header and FCS. */
1968 s->mtu = min(l2cap_pi(sk)->chan->omtu, l2cap_pi(sk)->chan->imtu) - 5;
1969
1970 rfcomm_send_sabm(s, 0);
1971 break;
1972
1973 case BT_CLOSED:
1974 s = rfcomm_session_close(s, sk->sk_err);
1975 break;
1976 }
1977 return s;
1978}
1979
1980static void rfcomm_process_sessions(void)
1981{
1982 struct list_head *p, *n;
1983
1984 rfcomm_lock();
1985
1986 list_for_each_safe(p, n, &session_list) {
1987 struct rfcomm_session *s;
1988 s = list_entry(p, struct rfcomm_session, list);
1989
1990 if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
1991 s->state = BT_DISCONN;
1992 rfcomm_send_disc(s, 0);
1993 continue;
1994 }
1995
1996 switch (s->state) {
1997 case BT_LISTEN:
1998 rfcomm_accept_connection(s);
1999 continue;
2000
2001 case BT_BOUND:
2002 s = rfcomm_check_connection(s);
2003 break;
2004
2005 default:
2006 s = rfcomm_process_rx(s);
2007 break;
2008 }
2009
2010 if (s)
2011 rfcomm_process_dlcs(s);
2012 }
2013
2014 rfcomm_unlock();
2015}
2016
2017static int rfcomm_add_listener(bdaddr_t *ba)
2018{
2019 struct sockaddr_l2 addr;
2020 struct socket *sock;
2021 struct sock *sk;
2022 struct rfcomm_session *s;
2023 int err = 0;
2024
2025 /* Create socket */
2026 err = rfcomm_l2sock_create(&sock);
2027 if (err < 0) {
2028 BT_ERR("Create socket failed %d", err);
2029 return err;
2030 }
2031
2032 /* Bind socket */
2033 bacpy(&addr.l2_bdaddr, ba);
2034 addr.l2_family = AF_BLUETOOTH;
2035 addr.l2_psm = cpu_to_le16(RFCOMM_PSM);
2036 addr.l2_cid = 0;
2037 addr.l2_bdaddr_type = BDADDR_BREDR;
2038 err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
2039 if (err < 0) {
2040 BT_ERR("Bind failed %d", err);
2041 goto failed;
2042 }
2043
2044 /* Set L2CAP options */
2045 sk = sock->sk;
2046 lock_sock(sk);
2047 l2cap_pi(sk)->chan->imtu = l2cap_mtu;
2048 release_sock(sk);
2049
2050 /* Start listening on the socket */
2051 err = kernel_listen(sock, 10);
2052 if (err) {
2053 BT_ERR("Listen failed %d", err);
2054 goto failed;
2055 }
2056
2057 /* Add listening session */
2058 s = rfcomm_session_add(sock, BT_LISTEN);
2059 if (!s) {
2060 err = -ENOMEM;
2061 goto failed;
2062 }
2063
2064 return 0;
2065failed:
2066 sock_release(sock);
2067 return err;
2068}
2069
2070static void rfcomm_kill_listener(void)
2071{
2072 struct rfcomm_session *s;
2073 struct list_head *p, *n;
2074
2075 BT_DBG("");
2076
2077 list_for_each_safe(p, n, &session_list) {
2078 s = list_entry(p, struct rfcomm_session, list);
2079 rfcomm_session_del(s);
2080 }
2081}
2082
2083static int rfcomm_run(void *unused)
2084{
2085 BT_DBG("");
2086
2087 set_user_nice(current, -10);
2088
2089 rfcomm_add_listener(BDADDR_ANY);
2090
2091 while (1) {
2092 set_current_state(TASK_INTERRUPTIBLE);
2093
2094 if (kthread_should_stop())
2095 break;
2096
2097 /* Process stuff */
2098 rfcomm_process_sessions();
2099
2100 schedule();
2101 }
2102 __set_current_state(TASK_RUNNING);
2103
2104 rfcomm_kill_listener();
2105
2106 return 0;
2107}
2108
2109static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
2110{
2111 struct rfcomm_session *s;
2112 struct rfcomm_dlc *d;
2113 struct list_head *p, *n;
2114
2115 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);
2116
2117 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
2118 if (!s)
2119 return;
2120
2121 list_for_each_safe(p, n, &s->dlcs) {
2122 d = list_entry(p, struct rfcomm_dlc, list);
2123
2124 if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) {
2125 rfcomm_dlc_clear_timer(d);
2126 if (status || encrypt == 0x00) {
2127 set_bit(RFCOMM_ENC_DROP, &d->flags);
2128 continue;
2129 }
2130 }
2131
2132 if (d->state == BT_CONNECTED && !status && encrypt == 0x00) {
2133 if (d->sec_level == BT_SECURITY_MEDIUM) {
2134 set_bit(RFCOMM_SEC_PENDING, &d->flags);
2135 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
2136 continue;
2137 } else if (d->sec_level == BT_SECURITY_HIGH ||
2138 d->sec_level == BT_SECURITY_FIPS) {
2139 set_bit(RFCOMM_ENC_DROP, &d->flags);
2140 continue;
2141 }
2142 }
2143
2144 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
2145 continue;
2146
2147 if (!status && hci_conn_check_secure(conn, d->sec_level))
2148 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
2149 else
2150 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
2151 }
2152
2153 rfcomm_schedule();
2154}
2155
2156static struct hci_cb rfcomm_cb = {
2157 .name = "RFCOMM",
2158 .security_cfm = rfcomm_security_cfm
2159};
2160
2161static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x)
2162{
2163 struct rfcomm_session *s;
2164
2165 rfcomm_lock();
2166
2167 list_for_each_entry(s, &session_list, list) {
2168 struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan;
2169 struct rfcomm_dlc *d;
2170 list_for_each_entry(d, &s->dlcs, list) {
2171 seq_printf(f, "%pMR %pMR %ld %d %d %d %d\n",
2172 &chan->src, &chan->dst,
2173 d->state, d->dlci, d->mtu,
2174 d->rx_credits, d->tx_credits);
2175 }
2176 }
2177
2178 rfcomm_unlock();
2179
2180 return 0;
2181}
2182
2183static int rfcomm_dlc_debugfs_open(struct inode *inode, struct file *file)
2184{
2185 return single_open(file, rfcomm_dlc_debugfs_show, inode->i_private);
2186}
2187
2188static const struct file_operations rfcomm_dlc_debugfs_fops = {
2189 .open = rfcomm_dlc_debugfs_open,
2190 .read = seq_read,
2191 .llseek = seq_lseek,
2192 .release = single_release,
2193};
2194
2195static struct dentry *rfcomm_dlc_debugfs;
2196
2197/* ---- Initialization ---- */
2198static int __init rfcomm_init(void)
2199{
2200 int err;
2201
2202 hci_register_cb(&rfcomm_cb);
2203
2204 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
2205 if (IS_ERR(rfcomm_thread)) {
2206 err = PTR_ERR(rfcomm_thread);
2207 goto unregister;
2208 }
2209
2210 err = rfcomm_init_ttys();
2211 if (err < 0)
2212 goto stop;
2213
2214 err = rfcomm_init_sockets();
2215 if (err < 0)
2216 goto cleanup;
2217
2218 BT_INFO("RFCOMM ver %s", VERSION);
2219
2220 if (IS_ERR_OR_NULL(bt_debugfs))
2221 return 0;
2222
2223 rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444,
2224 bt_debugfs, NULL,
2225 &rfcomm_dlc_debugfs_fops);
2226
2227 return 0;
2228
2229cleanup:
2230 rfcomm_cleanup_ttys();
2231
2232stop:
2233 kthread_stop(rfcomm_thread);
2234
2235unregister:
2236 hci_unregister_cb(&rfcomm_cb);
2237
2238 return err;
2239}
2240
2241static void __exit rfcomm_exit(void)
2242{
2243 debugfs_remove(rfcomm_dlc_debugfs);
2244
2245 hci_unregister_cb(&rfcomm_cb);
2246
2247 kthread_stop(rfcomm_thread);
2248
2249 rfcomm_cleanup_ttys();
2250
2251 rfcomm_cleanup_sockets();
2252}
2253
2254module_init(rfcomm_init);
2255module_exit(rfcomm_exit);
2256
2257module_param(disable_cfc, bool, 0644);
2258MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
2259
2260module_param(channel_mtu, int, 0644);
2261MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
2262
2263module_param(l2cap_mtu, uint, 0644);
2264MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");
2265
2266module_param(l2cap_ertm, bool, 0644);
2267MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection");
2268
2269MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
2270MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
2271MODULE_VERSION(VERSION);
2272MODULE_LICENSE("GPL");
2273MODULE_ALIAS("bt-proto-3");