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