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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/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");
1/*
2 RFCOMM implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
4 Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License version 2 as
8 published by the Free Software Foundation;
9
10 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
11 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
13 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
14 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
15 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18
19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
21 SOFTWARE IS DISCLAIMED.
22*/
23
24/*
25 * Bluetooth RFCOMM core.
26 */
27
28#include <linux/module.h>
29#include <linux/debugfs.h>
30#include <linux/kthread.h>
31#include <asm/unaligned.h>
32
33#include <net/bluetooth/bluetooth.h>
34#include <net/bluetooth/hci_core.h>
35#include <net/bluetooth/l2cap.h>
36#include <net/bluetooth/rfcomm.h>
37
38#define VERSION "1.11"
39
40static bool disable_cfc;
41static bool l2cap_ertm;
42static int channel_mtu = -1;
43static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
44
45static struct task_struct *rfcomm_thread;
46
47static DEFINE_MUTEX(rfcomm_mutex);
48#define rfcomm_lock() mutex_lock(&rfcomm_mutex)
49#define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
50
51
52static LIST_HEAD(session_list);
53
54static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
55static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
56static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
57static int rfcomm_queue_disc(struct rfcomm_dlc *d);
58static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
59static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
60static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
61static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
62static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
63static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
64
65static void rfcomm_process_connect(struct rfcomm_session *s);
66
67static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
68 bdaddr_t *dst,
69 u8 sec_level,
70 int *err);
71static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
72static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s);
73
74/* ---- RFCOMM frame parsing macros ---- */
75#define __get_dlci(b) ((b & 0xfc) >> 2)
76#define __get_channel(b) ((b & 0xf8) >> 3)
77#define __get_dir(b) ((b & 0x04) >> 2)
78#define __get_type(b) ((b & 0xef))
79
80#define __test_ea(b) ((b & 0x01))
81#define __test_cr(b) (!!(b & 0x02))
82#define __test_pf(b) (!!(b & 0x10))
83
84#define __session_dir(s) ((s)->initiator ? 0x00 : 0x01)
85
86#define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
87#define __ctrl(type, pf) (((type & 0xef) | (pf << 4)))
88#define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir)
89#define __srv_channel(dlci) (dlci >> 1)
90#define __dir(dlci) (dlci & 0x01)
91
92#define __len8(len) (((len) << 1) | 1)
93#define __len16(len) ((len) << 1)
94
95/* MCC macros */
96#define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01))
97#define __get_mcc_type(b) ((b & 0xfc) >> 2)
98#define __get_mcc_len(b) ((b & 0xfe) >> 1)
99
100/* RPN macros */
101#define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
102#define __get_rpn_data_bits(line) ((line) & 0x3)
103#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
104#define __get_rpn_parity(line) (((line) >> 3) & 0x7)
105
106static DECLARE_WAIT_QUEUE_HEAD(rfcomm_wq);
107
108static void rfcomm_schedule(void)
109{
110 wake_up_all(&rfcomm_wq);
111}
112
113/* ---- RFCOMM FCS computation ---- */
114
115/* reversed, 8-bit, poly=0x07 */
116static unsigned char rfcomm_crc_table[256] = {
117 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
118 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
119 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
120 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
121
122 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
123 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
124 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
125 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
126
127 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
128 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
129 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
130 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
131
132 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
133 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
134 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
135 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
136
137 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
138 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
139 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
140 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
141
142 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
143 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
144 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
145 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
146
147 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
148 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
149 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
150 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
151
152 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
153 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
154 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
155 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
156};
157
158/* CRC on 2 bytes */
159#define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
160
161/* FCS on 2 bytes */
162static inline u8 __fcs(u8 *data)
163{
164 return 0xff - __crc(data);
165}
166
167/* FCS on 3 bytes */
168static inline u8 __fcs2(u8 *data)
169{
170 return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]];
171}
172
173/* Check FCS */
174static inline int __check_fcs(u8 *data, int type, u8 fcs)
175{
176 u8 f = __crc(data);
177
178 if (type != RFCOMM_UIH)
179 f = rfcomm_crc_table[f ^ data[2]];
180
181 return rfcomm_crc_table[f ^ fcs] != 0xcf;
182}
183
184/* ---- L2CAP callbacks ---- */
185static void rfcomm_l2state_change(struct sock *sk)
186{
187 BT_DBG("%p state %d", sk, sk->sk_state);
188 rfcomm_schedule();
189}
190
191static void rfcomm_l2data_ready(struct sock *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 /* fall through */
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
556int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
557{
558 int len = skb->len;
559
560 if (d->state != BT_CONNECTED)
561 return -ENOTCONN;
562
563 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
564
565 if (len > d->mtu)
566 return -EINVAL;
567
568 rfcomm_make_uih(skb, d->addr);
569 skb_queue_tail(&d->tx_queue, skb);
570
571 if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
572 rfcomm_schedule();
573 return len;
574}
575
576void rfcomm_dlc_send_noerror(struct rfcomm_dlc *d, struct sk_buff *skb)
577{
578 int len = skb->len;
579
580 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
581
582 rfcomm_make_uih(skb, d->addr);
583 skb_queue_tail(&d->tx_queue, skb);
584
585 if (d->state == BT_CONNECTED &&
586 !test_bit(RFCOMM_TX_THROTTLED, &d->flags))
587 rfcomm_schedule();
588}
589
590void __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
591{
592 BT_DBG("dlc %p state %ld", d, d->state);
593
594 if (!d->cfc) {
595 d->v24_sig |= RFCOMM_V24_FC;
596 set_bit(RFCOMM_MSC_PENDING, &d->flags);
597 }
598 rfcomm_schedule();
599}
600
601void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
602{
603 BT_DBG("dlc %p state %ld", d, d->state);
604
605 if (!d->cfc) {
606 d->v24_sig &= ~RFCOMM_V24_FC;
607 set_bit(RFCOMM_MSC_PENDING, &d->flags);
608 }
609 rfcomm_schedule();
610}
611
612/*
613 Set/get modem status functions use _local_ status i.e. what we report
614 to the other side.
615 Remote status is provided by dlc->modem_status() callback.
616 */
617int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig)
618{
619 BT_DBG("dlc %p state %ld v24_sig 0x%x",
620 d, d->state, v24_sig);
621
622 if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
623 v24_sig |= RFCOMM_V24_FC;
624 else
625 v24_sig &= ~RFCOMM_V24_FC;
626
627 d->v24_sig = v24_sig;
628
629 if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags))
630 rfcomm_schedule();
631
632 return 0;
633}
634
635int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig)
636{
637 BT_DBG("dlc %p state %ld v24_sig 0x%x",
638 d, d->state, d->v24_sig);
639
640 *v24_sig = d->v24_sig;
641 return 0;
642}
643
644/* ---- RFCOMM sessions ---- */
645static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
646{
647 struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL);
648
649 if (!s)
650 return NULL;
651
652 BT_DBG("session %p sock %p", s, sock);
653
654 timer_setup(&s->timer, rfcomm_session_timeout, 0);
655
656 INIT_LIST_HEAD(&s->dlcs);
657 s->state = state;
658 s->sock = sock;
659
660 s->mtu = RFCOMM_DEFAULT_MTU;
661 s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;
662
663 /* Do not increment module usage count for listening sessions.
664 * Otherwise we won't be able to unload the module. */
665 if (state != BT_LISTEN)
666 if (!try_module_get(THIS_MODULE)) {
667 kfree(s);
668 return NULL;
669 }
670
671 list_add(&s->list, &session_list);
672
673 return s;
674}
675
676static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s)
677{
678 int state = s->state;
679
680 BT_DBG("session %p state %ld", s, s->state);
681
682 list_del(&s->list);
683
684 rfcomm_session_clear_timer(s);
685 sock_release(s->sock);
686 kfree(s);
687
688 if (state != BT_LISTEN)
689 module_put(THIS_MODULE);
690
691 return NULL;
692}
693
694static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst)
695{
696 struct rfcomm_session *s, *n;
697 struct l2cap_chan *chan;
698 list_for_each_entry_safe(s, n, &session_list, list) {
699 chan = l2cap_pi(s->sock->sk)->chan;
700
701 if ((!bacmp(src, BDADDR_ANY) || !bacmp(&chan->src, src)) &&
702 !bacmp(&chan->dst, dst))
703 return s;
704 }
705 return NULL;
706}
707
708static struct rfcomm_session *rfcomm_session_close(struct rfcomm_session *s,
709 int err)
710{
711 struct rfcomm_dlc *d, *n;
712
713 s->state = BT_CLOSED;
714
715 BT_DBG("session %p state %ld err %d", s, s->state, err);
716
717 /* Close all dlcs */
718 list_for_each_entry_safe(d, n, &s->dlcs, list) {
719 d->state = BT_CLOSED;
720 __rfcomm_dlc_close(d, err);
721 }
722
723 rfcomm_session_clear_timer(s);
724 return rfcomm_session_del(s);
725}
726
727static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
728 bdaddr_t *dst,
729 u8 sec_level,
730 int *err)
731{
732 struct rfcomm_session *s = NULL;
733 struct sockaddr_l2 addr;
734 struct socket *sock;
735 struct sock *sk;
736
737 BT_DBG("%pMR -> %pMR", src, dst);
738
739 *err = rfcomm_l2sock_create(&sock);
740 if (*err < 0)
741 return NULL;
742
743 bacpy(&addr.l2_bdaddr, src);
744 addr.l2_family = AF_BLUETOOTH;
745 addr.l2_psm = 0;
746 addr.l2_cid = 0;
747 addr.l2_bdaddr_type = BDADDR_BREDR;
748 *err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
749 if (*err < 0)
750 goto failed;
751
752 /* Set L2CAP options */
753 sk = sock->sk;
754 lock_sock(sk);
755 l2cap_pi(sk)->chan->imtu = l2cap_mtu;
756 l2cap_pi(sk)->chan->sec_level = sec_level;
757 if (l2cap_ertm)
758 l2cap_pi(sk)->chan->mode = L2CAP_MODE_ERTM;
759 release_sock(sk);
760
761 s = rfcomm_session_add(sock, BT_BOUND);
762 if (!s) {
763 *err = -ENOMEM;
764 goto failed;
765 }
766
767 s->initiator = 1;
768
769 bacpy(&addr.l2_bdaddr, dst);
770 addr.l2_family = AF_BLUETOOTH;
771 addr.l2_psm = cpu_to_le16(L2CAP_PSM_RFCOMM);
772 addr.l2_cid = 0;
773 addr.l2_bdaddr_type = BDADDR_BREDR;
774 *err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
775 if (*err == 0 || *err == -EINPROGRESS)
776 return s;
777
778 return rfcomm_session_del(s);
779
780failed:
781 sock_release(sock);
782 return NULL;
783}
784
785void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst)
786{
787 struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan;
788 if (src)
789 bacpy(src, &chan->src);
790 if (dst)
791 bacpy(dst, &chan->dst);
792}
793
794/* ---- RFCOMM frame sending ---- */
795static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len)
796{
797 struct kvec iv = { data, len };
798 struct msghdr msg;
799
800 BT_DBG("session %p len %d", s, len);
801
802 memset(&msg, 0, sizeof(msg));
803
804 return kernel_sendmsg(s->sock, &msg, &iv, 1, len);
805}
806
807static int rfcomm_send_cmd(struct rfcomm_session *s, struct rfcomm_cmd *cmd)
808{
809 BT_DBG("%p cmd %u", s, cmd->ctrl);
810
811 return rfcomm_send_frame(s, (void *) cmd, sizeof(*cmd));
812}
813
814static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci)
815{
816 struct rfcomm_cmd cmd;
817
818 BT_DBG("%p dlci %d", s, dlci);
819
820 cmd.addr = __addr(s->initiator, dlci);
821 cmd.ctrl = __ctrl(RFCOMM_SABM, 1);
822 cmd.len = __len8(0);
823 cmd.fcs = __fcs2((u8 *) &cmd);
824
825 return rfcomm_send_cmd(s, &cmd);
826}
827
828static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci)
829{
830 struct rfcomm_cmd cmd;
831
832 BT_DBG("%p dlci %d", s, dlci);
833
834 cmd.addr = __addr(!s->initiator, dlci);
835 cmd.ctrl = __ctrl(RFCOMM_UA, 1);
836 cmd.len = __len8(0);
837 cmd.fcs = __fcs2((u8 *) &cmd);
838
839 return rfcomm_send_cmd(s, &cmd);
840}
841
842static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci)
843{
844 struct rfcomm_cmd cmd;
845
846 BT_DBG("%p dlci %d", s, dlci);
847
848 cmd.addr = __addr(s->initiator, dlci);
849 cmd.ctrl = __ctrl(RFCOMM_DISC, 1);
850 cmd.len = __len8(0);
851 cmd.fcs = __fcs2((u8 *) &cmd);
852
853 return rfcomm_send_cmd(s, &cmd);
854}
855
856static int rfcomm_queue_disc(struct rfcomm_dlc *d)
857{
858 struct rfcomm_cmd *cmd;
859 struct sk_buff *skb;
860
861 BT_DBG("dlc %p dlci %d", d, d->dlci);
862
863 skb = alloc_skb(sizeof(*cmd), GFP_KERNEL);
864 if (!skb)
865 return -ENOMEM;
866
867 cmd = __skb_put(skb, sizeof(*cmd));
868 cmd->addr = d->addr;
869 cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
870 cmd->len = __len8(0);
871 cmd->fcs = __fcs2((u8 *) cmd);
872
873 skb_queue_tail(&d->tx_queue, skb);
874 rfcomm_schedule();
875 return 0;
876}
877
878static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci)
879{
880 struct rfcomm_cmd cmd;
881
882 BT_DBG("%p dlci %d", s, dlci);
883
884 cmd.addr = __addr(!s->initiator, dlci);
885 cmd.ctrl = __ctrl(RFCOMM_DM, 1);
886 cmd.len = __len8(0);
887 cmd.fcs = __fcs2((u8 *) &cmd);
888
889 return rfcomm_send_cmd(s, &cmd);
890}
891
892static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type)
893{
894 struct rfcomm_hdr *hdr;
895 struct rfcomm_mcc *mcc;
896 u8 buf[16], *ptr = buf;
897
898 BT_DBG("%p cr %d type %d", s, cr, type);
899
900 hdr = (void *) ptr; ptr += sizeof(*hdr);
901 hdr->addr = __addr(s->initiator, 0);
902 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
903 hdr->len = __len8(sizeof(*mcc) + 1);
904
905 mcc = (void *) ptr; ptr += sizeof(*mcc);
906 mcc->type = __mcc_type(0, RFCOMM_NSC);
907 mcc->len = __len8(1);
908
909 /* Type that we didn't like */
910 *ptr = __mcc_type(cr, type); ptr++;
911
912 *ptr = __fcs(buf); ptr++;
913
914 return rfcomm_send_frame(s, buf, ptr - buf);
915}
916
917static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d)
918{
919 struct rfcomm_hdr *hdr;
920 struct rfcomm_mcc *mcc;
921 struct rfcomm_pn *pn;
922 u8 buf[16], *ptr = buf;
923
924 BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu);
925
926 hdr = (void *) ptr; ptr += sizeof(*hdr);
927 hdr->addr = __addr(s->initiator, 0);
928 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
929 hdr->len = __len8(sizeof(*mcc) + sizeof(*pn));
930
931 mcc = (void *) ptr; ptr += sizeof(*mcc);
932 mcc->type = __mcc_type(cr, RFCOMM_PN);
933 mcc->len = __len8(sizeof(*pn));
934
935 pn = (void *) ptr; ptr += sizeof(*pn);
936 pn->dlci = d->dlci;
937 pn->priority = d->priority;
938 pn->ack_timer = 0;
939 pn->max_retrans = 0;
940
941 if (s->cfc) {
942 pn->flow_ctrl = cr ? 0xf0 : 0xe0;
943 pn->credits = RFCOMM_DEFAULT_CREDITS;
944 } else {
945 pn->flow_ctrl = 0;
946 pn->credits = 0;
947 }
948
949 if (cr && channel_mtu >= 0)
950 pn->mtu = cpu_to_le16(channel_mtu);
951 else
952 pn->mtu = cpu_to_le16(d->mtu);
953
954 *ptr = __fcs(buf); ptr++;
955
956 return rfcomm_send_frame(s, buf, ptr - buf);
957}
958
959int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
960 u8 bit_rate, u8 data_bits, u8 stop_bits,
961 u8 parity, u8 flow_ctrl_settings,
962 u8 xon_char, u8 xoff_char, u16 param_mask)
963{
964 struct rfcomm_hdr *hdr;
965 struct rfcomm_mcc *mcc;
966 struct rfcomm_rpn *rpn;
967 u8 buf[16], *ptr = buf;
968
969 BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x"
970 " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x",
971 s, cr, dlci, bit_rate, data_bits, stop_bits, parity,
972 flow_ctrl_settings, xon_char, xoff_char, param_mask);
973
974 hdr = (void *) ptr; ptr += sizeof(*hdr);
975 hdr->addr = __addr(s->initiator, 0);
976 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
977 hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn));
978
979 mcc = (void *) ptr; ptr += sizeof(*mcc);
980 mcc->type = __mcc_type(cr, RFCOMM_RPN);
981 mcc->len = __len8(sizeof(*rpn));
982
983 rpn = (void *) ptr; ptr += sizeof(*rpn);
984 rpn->dlci = __addr(1, dlci);
985 rpn->bit_rate = bit_rate;
986 rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity);
987 rpn->flow_ctrl = flow_ctrl_settings;
988 rpn->xon_char = xon_char;
989 rpn->xoff_char = xoff_char;
990 rpn->param_mask = cpu_to_le16(param_mask);
991
992 *ptr = __fcs(buf); ptr++;
993
994 return rfcomm_send_frame(s, buf, ptr - buf);
995}
996
997static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status)
998{
999 struct rfcomm_hdr *hdr;
1000 struct rfcomm_mcc *mcc;
1001 struct rfcomm_rls *rls;
1002 u8 buf[16], *ptr = buf;
1003
1004 BT_DBG("%p cr %d status 0x%x", s, cr, status);
1005
1006 hdr = (void *) ptr; ptr += sizeof(*hdr);
1007 hdr->addr = __addr(s->initiator, 0);
1008 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1009 hdr->len = __len8(sizeof(*mcc) + sizeof(*rls));
1010
1011 mcc = (void *) ptr; ptr += sizeof(*mcc);
1012 mcc->type = __mcc_type(cr, RFCOMM_RLS);
1013 mcc->len = __len8(sizeof(*rls));
1014
1015 rls = (void *) ptr; ptr += sizeof(*rls);
1016 rls->dlci = __addr(1, dlci);
1017 rls->status = status;
1018
1019 *ptr = __fcs(buf); ptr++;
1020
1021 return rfcomm_send_frame(s, buf, ptr - buf);
1022}
1023
1024static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig)
1025{
1026 struct rfcomm_hdr *hdr;
1027 struct rfcomm_mcc *mcc;
1028 struct rfcomm_msc *msc;
1029 u8 buf[16], *ptr = buf;
1030
1031 BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig);
1032
1033 hdr = (void *) ptr; ptr += sizeof(*hdr);
1034 hdr->addr = __addr(s->initiator, 0);
1035 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1036 hdr->len = __len8(sizeof(*mcc) + sizeof(*msc));
1037
1038 mcc = (void *) ptr; ptr += sizeof(*mcc);
1039 mcc->type = __mcc_type(cr, RFCOMM_MSC);
1040 mcc->len = __len8(sizeof(*msc));
1041
1042 msc = (void *) ptr; ptr += sizeof(*msc);
1043 msc->dlci = __addr(1, dlci);
1044 msc->v24_sig = v24_sig | 0x01;
1045
1046 *ptr = __fcs(buf); ptr++;
1047
1048 return rfcomm_send_frame(s, buf, ptr - buf);
1049}
1050
1051static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr)
1052{
1053 struct rfcomm_hdr *hdr;
1054 struct rfcomm_mcc *mcc;
1055 u8 buf[16], *ptr = buf;
1056
1057 BT_DBG("%p cr %d", s, cr);
1058
1059 hdr = (void *) ptr; ptr += sizeof(*hdr);
1060 hdr->addr = __addr(s->initiator, 0);
1061 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1062 hdr->len = __len8(sizeof(*mcc));
1063
1064 mcc = (void *) ptr; ptr += sizeof(*mcc);
1065 mcc->type = __mcc_type(cr, RFCOMM_FCOFF);
1066 mcc->len = __len8(0);
1067
1068 *ptr = __fcs(buf); ptr++;
1069
1070 return rfcomm_send_frame(s, buf, ptr - buf);
1071}
1072
1073static int rfcomm_send_fcon(struct rfcomm_session *s, int cr)
1074{
1075 struct rfcomm_hdr *hdr;
1076 struct rfcomm_mcc *mcc;
1077 u8 buf[16], *ptr = buf;
1078
1079 BT_DBG("%p cr %d", s, cr);
1080
1081 hdr = (void *) ptr; ptr += sizeof(*hdr);
1082 hdr->addr = __addr(s->initiator, 0);
1083 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1084 hdr->len = __len8(sizeof(*mcc));
1085
1086 mcc = (void *) ptr; ptr += sizeof(*mcc);
1087 mcc->type = __mcc_type(cr, RFCOMM_FCON);
1088 mcc->len = __len8(0);
1089
1090 *ptr = __fcs(buf); ptr++;
1091
1092 return rfcomm_send_frame(s, buf, ptr - buf);
1093}
1094
1095static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len)
1096{
1097 struct socket *sock = s->sock;
1098 struct kvec iv[3];
1099 struct msghdr msg;
1100 unsigned char hdr[5], crc[1];
1101
1102 if (len > 125)
1103 return -EINVAL;
1104
1105 BT_DBG("%p cr %d", s, cr);
1106
1107 hdr[0] = __addr(s->initiator, 0);
1108 hdr[1] = __ctrl(RFCOMM_UIH, 0);
1109 hdr[2] = 0x01 | ((len + 2) << 1);
1110 hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2);
1111 hdr[4] = 0x01 | (len << 1);
1112
1113 crc[0] = __fcs(hdr);
1114
1115 iv[0].iov_base = hdr;
1116 iv[0].iov_len = 5;
1117 iv[1].iov_base = pattern;
1118 iv[1].iov_len = len;
1119 iv[2].iov_base = crc;
1120 iv[2].iov_len = 1;
1121
1122 memset(&msg, 0, sizeof(msg));
1123
1124 return kernel_sendmsg(sock, &msg, iv, 3, 6 + len);
1125}
1126
1127static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits)
1128{
1129 struct rfcomm_hdr *hdr;
1130 u8 buf[16], *ptr = buf;
1131
1132 BT_DBG("%p addr %d credits %d", s, addr, credits);
1133
1134 hdr = (void *) ptr; ptr += sizeof(*hdr);
1135 hdr->addr = addr;
1136 hdr->ctrl = __ctrl(RFCOMM_UIH, 1);
1137 hdr->len = __len8(0);
1138
1139 *ptr = credits; ptr++;
1140
1141 *ptr = __fcs(buf); ptr++;
1142
1143 return rfcomm_send_frame(s, buf, ptr - buf);
1144}
1145
1146static void rfcomm_make_uih(struct sk_buff *skb, u8 addr)
1147{
1148 struct rfcomm_hdr *hdr;
1149 int len = skb->len;
1150 u8 *crc;
1151
1152 if (len > 127) {
1153 hdr = skb_push(skb, 4);
1154 put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len);
1155 } else {
1156 hdr = skb_push(skb, 3);
1157 hdr->len = __len8(len);
1158 }
1159 hdr->addr = addr;
1160 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1161
1162 crc = skb_put(skb, 1);
1163 *crc = __fcs((void *) hdr);
1164}
1165
1166/* ---- RFCOMM frame reception ---- */
1167static struct rfcomm_session *rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci)
1168{
1169 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1170
1171 if (dlci) {
1172 /* Data channel */
1173 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1174 if (!d) {
1175 rfcomm_send_dm(s, dlci);
1176 return s;
1177 }
1178
1179 switch (d->state) {
1180 case BT_CONNECT:
1181 rfcomm_dlc_clear_timer(d);
1182
1183 rfcomm_dlc_lock(d);
1184 d->state = BT_CONNECTED;
1185 d->state_change(d, 0);
1186 rfcomm_dlc_unlock(d);
1187
1188 rfcomm_send_msc(s, 1, dlci, d->v24_sig);
1189 break;
1190
1191 case BT_DISCONN:
1192 d->state = BT_CLOSED;
1193 __rfcomm_dlc_close(d, 0);
1194
1195 if (list_empty(&s->dlcs)) {
1196 s->state = BT_DISCONN;
1197 rfcomm_send_disc(s, 0);
1198 rfcomm_session_clear_timer(s);
1199 }
1200
1201 break;
1202 }
1203 } else {
1204 /* Control channel */
1205 switch (s->state) {
1206 case BT_CONNECT:
1207 s->state = BT_CONNECTED;
1208 rfcomm_process_connect(s);
1209 break;
1210
1211 case BT_DISCONN:
1212 s = rfcomm_session_close(s, ECONNRESET);
1213 break;
1214 }
1215 }
1216 return s;
1217}
1218
1219static struct rfcomm_session *rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci)
1220{
1221 int err = 0;
1222
1223 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1224
1225 if (dlci) {
1226 /* Data DLC */
1227 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1228 if (d) {
1229 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1230 err = ECONNREFUSED;
1231 else
1232 err = ECONNRESET;
1233
1234 d->state = BT_CLOSED;
1235 __rfcomm_dlc_close(d, err);
1236 }
1237 } else {
1238 if (s->state == BT_CONNECT)
1239 err = ECONNREFUSED;
1240 else
1241 err = ECONNRESET;
1242
1243 s = rfcomm_session_close(s, err);
1244 }
1245 return s;
1246}
1247
1248static struct rfcomm_session *rfcomm_recv_disc(struct rfcomm_session *s,
1249 u8 dlci)
1250{
1251 int err = 0;
1252
1253 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1254
1255 if (dlci) {
1256 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1257 if (d) {
1258 rfcomm_send_ua(s, dlci);
1259
1260 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1261 err = ECONNREFUSED;
1262 else
1263 err = ECONNRESET;
1264
1265 d->state = BT_CLOSED;
1266 __rfcomm_dlc_close(d, err);
1267 } else
1268 rfcomm_send_dm(s, dlci);
1269
1270 } else {
1271 rfcomm_send_ua(s, 0);
1272
1273 if (s->state == BT_CONNECT)
1274 err = ECONNREFUSED;
1275 else
1276 err = ECONNRESET;
1277
1278 s = rfcomm_session_close(s, err);
1279 }
1280 return s;
1281}
1282
1283void rfcomm_dlc_accept(struct rfcomm_dlc *d)
1284{
1285 struct sock *sk = d->session->sock->sk;
1286 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
1287
1288 BT_DBG("dlc %p", d);
1289
1290 rfcomm_send_ua(d->session, d->dlci);
1291
1292 rfcomm_dlc_clear_timer(d);
1293
1294 rfcomm_dlc_lock(d);
1295 d->state = BT_CONNECTED;
1296 d->state_change(d, 0);
1297 rfcomm_dlc_unlock(d);
1298
1299 if (d->role_switch)
1300 hci_conn_switch_role(conn->hcon, 0x00);
1301
1302 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1303}
1304
1305static void rfcomm_check_accept(struct rfcomm_dlc *d)
1306{
1307 if (rfcomm_check_security(d)) {
1308 if (d->defer_setup) {
1309 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1310 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1311
1312 rfcomm_dlc_lock(d);
1313 d->state = BT_CONNECT2;
1314 d->state_change(d, 0);
1315 rfcomm_dlc_unlock(d);
1316 } else
1317 rfcomm_dlc_accept(d);
1318 } else {
1319 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1320 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1321 }
1322}
1323
1324static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
1325{
1326 struct rfcomm_dlc *d;
1327 u8 channel;
1328
1329 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1330
1331 if (!dlci) {
1332 rfcomm_send_ua(s, 0);
1333
1334 if (s->state == BT_OPEN) {
1335 s->state = BT_CONNECTED;
1336 rfcomm_process_connect(s);
1337 }
1338 return 0;
1339 }
1340
1341 /* Check if DLC exists */
1342 d = rfcomm_dlc_get(s, dlci);
1343 if (d) {
1344 if (d->state == BT_OPEN) {
1345 /* DLC was previously opened by PN request */
1346 rfcomm_check_accept(d);
1347 }
1348 return 0;
1349 }
1350
1351 /* Notify socket layer about incoming connection */
1352 channel = __srv_channel(dlci);
1353 if (rfcomm_connect_ind(s, channel, &d)) {
1354 d->dlci = dlci;
1355 d->addr = __addr(s->initiator, dlci);
1356 rfcomm_dlc_link(s, d);
1357
1358 rfcomm_check_accept(d);
1359 } else {
1360 rfcomm_send_dm(s, dlci);
1361 }
1362
1363 return 0;
1364}
1365
1366static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
1367{
1368 struct rfcomm_session *s = d->session;
1369
1370 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
1371 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);
1372
1373 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
1374 pn->flow_ctrl == 0xe0) {
1375 d->cfc = RFCOMM_CFC_ENABLED;
1376 d->tx_credits = pn->credits;
1377 } else {
1378 d->cfc = RFCOMM_CFC_DISABLED;
1379 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1380 }
1381
1382 if (s->cfc == RFCOMM_CFC_UNKNOWN)
1383 s->cfc = d->cfc;
1384
1385 d->priority = pn->priority;
1386
1387 d->mtu = __le16_to_cpu(pn->mtu);
1388
1389 if (cr && d->mtu > s->mtu)
1390 d->mtu = s->mtu;
1391
1392 return 0;
1393}
1394
1395static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1396{
1397 struct rfcomm_pn *pn = (void *) skb->data;
1398 struct rfcomm_dlc *d;
1399 u8 dlci = pn->dlci;
1400
1401 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1402
1403 if (!dlci)
1404 return 0;
1405
1406 d = rfcomm_dlc_get(s, dlci);
1407 if (d) {
1408 if (cr) {
1409 /* PN request */
1410 rfcomm_apply_pn(d, cr, pn);
1411 rfcomm_send_pn(s, 0, d);
1412 } else {
1413 /* PN response */
1414 switch (d->state) {
1415 case BT_CONFIG:
1416 rfcomm_apply_pn(d, cr, pn);
1417
1418 d->state = BT_CONNECT;
1419 rfcomm_send_sabm(s, d->dlci);
1420 break;
1421 }
1422 }
1423 } else {
1424 u8 channel = __srv_channel(dlci);
1425
1426 if (!cr)
1427 return 0;
1428
1429 /* PN request for non existing DLC.
1430 * Assume incoming connection. */
1431 if (rfcomm_connect_ind(s, channel, &d)) {
1432 d->dlci = dlci;
1433 d->addr = __addr(s->initiator, dlci);
1434 rfcomm_dlc_link(s, d);
1435
1436 rfcomm_apply_pn(d, cr, pn);
1437
1438 d->state = BT_OPEN;
1439 rfcomm_send_pn(s, 0, d);
1440 } else {
1441 rfcomm_send_dm(s, dlci);
1442 }
1443 }
1444 return 0;
1445}
1446
1447static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb)
1448{
1449 struct rfcomm_rpn *rpn = (void *) skb->data;
1450 u8 dlci = __get_dlci(rpn->dlci);
1451
1452 u8 bit_rate = 0;
1453 u8 data_bits = 0;
1454 u8 stop_bits = 0;
1455 u8 parity = 0;
1456 u8 flow_ctrl = 0;
1457 u8 xon_char = 0;
1458 u8 xoff_char = 0;
1459 u16 rpn_mask = RFCOMM_RPN_PM_ALL;
1460
1461 BT_DBG("dlci %d cr %d len 0x%x bitr 0x%x line 0x%x flow 0x%x xonc 0x%x xoffc 0x%x pm 0x%x",
1462 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl,
1463 rpn->xon_char, rpn->xoff_char, rpn->param_mask);
1464
1465 if (!cr)
1466 return 0;
1467
1468 if (len == 1) {
1469 /* This is a request, return default (according to ETSI TS 07.10) settings */
1470 bit_rate = RFCOMM_RPN_BR_9600;
1471 data_bits = RFCOMM_RPN_DATA_8;
1472 stop_bits = RFCOMM_RPN_STOP_1;
1473 parity = RFCOMM_RPN_PARITY_NONE;
1474 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1475 xon_char = RFCOMM_RPN_XON_CHAR;
1476 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1477 goto rpn_out;
1478 }
1479
1480 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
1481 * no parity, no flow control lines, normal XON/XOFF chars */
1482
1483 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
1484 bit_rate = rpn->bit_rate;
1485 if (bit_rate > RFCOMM_RPN_BR_230400) {
1486 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
1487 bit_rate = RFCOMM_RPN_BR_9600;
1488 rpn_mask ^= RFCOMM_RPN_PM_BITRATE;
1489 }
1490 }
1491
1492 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
1493 data_bits = __get_rpn_data_bits(rpn->line_settings);
1494 if (data_bits != RFCOMM_RPN_DATA_8) {
1495 BT_DBG("RPN data bits mismatch 0x%x", data_bits);
1496 data_bits = RFCOMM_RPN_DATA_8;
1497 rpn_mask ^= RFCOMM_RPN_PM_DATA;
1498 }
1499 }
1500
1501 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
1502 stop_bits = __get_rpn_stop_bits(rpn->line_settings);
1503 if (stop_bits != RFCOMM_RPN_STOP_1) {
1504 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits);
1505 stop_bits = RFCOMM_RPN_STOP_1;
1506 rpn_mask ^= RFCOMM_RPN_PM_STOP;
1507 }
1508 }
1509
1510 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
1511 parity = __get_rpn_parity(rpn->line_settings);
1512 if (parity != RFCOMM_RPN_PARITY_NONE) {
1513 BT_DBG("RPN parity mismatch 0x%x", parity);
1514 parity = RFCOMM_RPN_PARITY_NONE;
1515 rpn_mask ^= RFCOMM_RPN_PM_PARITY;
1516 }
1517 }
1518
1519 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
1520 flow_ctrl = rpn->flow_ctrl;
1521 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
1522 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl);
1523 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1524 rpn_mask ^= RFCOMM_RPN_PM_FLOW;
1525 }
1526 }
1527
1528 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
1529 xon_char = rpn->xon_char;
1530 if (xon_char != RFCOMM_RPN_XON_CHAR) {
1531 BT_DBG("RPN XON char mismatch 0x%x", xon_char);
1532 xon_char = RFCOMM_RPN_XON_CHAR;
1533 rpn_mask ^= RFCOMM_RPN_PM_XON;
1534 }
1535 }
1536
1537 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
1538 xoff_char = rpn->xoff_char;
1539 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
1540 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char);
1541 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1542 rpn_mask ^= RFCOMM_RPN_PM_XOFF;
1543 }
1544 }
1545
1546rpn_out:
1547 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
1548 parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
1549
1550 return 0;
1551}
1552
1553static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1554{
1555 struct rfcomm_rls *rls = (void *) skb->data;
1556 u8 dlci = __get_dlci(rls->dlci);
1557
1558 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status);
1559
1560 if (!cr)
1561 return 0;
1562
1563 /* We should probably do something with this information here. But
1564 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's
1565 * mandatory to recognise and respond to RLS */
1566
1567 rfcomm_send_rls(s, 0, dlci, rls->status);
1568
1569 return 0;
1570}
1571
1572static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1573{
1574 struct rfcomm_msc *msc = (void *) skb->data;
1575 struct rfcomm_dlc *d;
1576 u8 dlci = __get_dlci(msc->dlci);
1577
1578 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig);
1579
1580 d = rfcomm_dlc_get(s, dlci);
1581 if (!d)
1582 return 0;
1583
1584 if (cr) {
1585 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
1586 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1587 else
1588 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1589
1590 rfcomm_dlc_lock(d);
1591
1592 d->remote_v24_sig = msc->v24_sig;
1593
1594 if (d->modem_status)
1595 d->modem_status(d, msc->v24_sig);
1596
1597 rfcomm_dlc_unlock(d);
1598
1599 rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
1600
1601 d->mscex |= RFCOMM_MSCEX_RX;
1602 } else
1603 d->mscex |= RFCOMM_MSCEX_TX;
1604
1605 return 0;
1606}
1607
1608static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb)
1609{
1610 struct rfcomm_mcc *mcc = (void *) skb->data;
1611 u8 type, cr, len;
1612
1613 cr = __test_cr(mcc->type);
1614 type = __get_mcc_type(mcc->type);
1615 len = __get_mcc_len(mcc->len);
1616
1617 BT_DBG("%p type 0x%x cr %d", s, type, cr);
1618
1619 skb_pull(skb, 2);
1620
1621 switch (type) {
1622 case RFCOMM_PN:
1623 rfcomm_recv_pn(s, cr, skb);
1624 break;
1625
1626 case RFCOMM_RPN:
1627 rfcomm_recv_rpn(s, cr, len, skb);
1628 break;
1629
1630 case RFCOMM_RLS:
1631 rfcomm_recv_rls(s, cr, skb);
1632 break;
1633
1634 case RFCOMM_MSC:
1635 rfcomm_recv_msc(s, cr, skb);
1636 break;
1637
1638 case RFCOMM_FCOFF:
1639 if (cr) {
1640 set_bit(RFCOMM_TX_THROTTLED, &s->flags);
1641 rfcomm_send_fcoff(s, 0);
1642 }
1643 break;
1644
1645 case RFCOMM_FCON:
1646 if (cr) {
1647 clear_bit(RFCOMM_TX_THROTTLED, &s->flags);
1648 rfcomm_send_fcon(s, 0);
1649 }
1650 break;
1651
1652 case RFCOMM_TEST:
1653 if (cr)
1654 rfcomm_send_test(s, 0, skb->data, skb->len);
1655 break;
1656
1657 case RFCOMM_NSC:
1658 break;
1659
1660 default:
1661 BT_ERR("Unknown control type 0x%02x", type);
1662 rfcomm_send_nsc(s, cr, type);
1663 break;
1664 }
1665 return 0;
1666}
1667
1668static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb)
1669{
1670 struct rfcomm_dlc *d;
1671
1672 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf);
1673
1674 d = rfcomm_dlc_get(s, dlci);
1675 if (!d) {
1676 rfcomm_send_dm(s, dlci);
1677 goto drop;
1678 }
1679
1680 if (pf && d->cfc) {
1681 u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);
1682
1683 d->tx_credits += credits;
1684 if (d->tx_credits)
1685 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1686 }
1687
1688 if (skb->len && d->state == BT_CONNECTED) {
1689 rfcomm_dlc_lock(d);
1690 d->rx_credits--;
1691 d->data_ready(d, skb);
1692 rfcomm_dlc_unlock(d);
1693 return 0;
1694 }
1695
1696drop:
1697 kfree_skb(skb);
1698 return 0;
1699}
1700
1701static struct rfcomm_session *rfcomm_recv_frame(struct rfcomm_session *s,
1702 struct sk_buff *skb)
1703{
1704 struct rfcomm_hdr *hdr = (void *) skb->data;
1705 u8 type, dlci, fcs;
1706
1707 if (!s) {
1708 /* no session, so free socket data */
1709 kfree_skb(skb);
1710 return s;
1711 }
1712
1713 dlci = __get_dlci(hdr->addr);
1714 type = __get_type(hdr->ctrl);
1715
1716 /* Trim FCS */
1717 skb->len--; skb->tail--;
1718 fcs = *(u8 *)skb_tail_pointer(skb);
1719
1720 if (__check_fcs(skb->data, type, fcs)) {
1721 BT_ERR("bad checksum in packet");
1722 kfree_skb(skb);
1723 return s;
1724 }
1725
1726 if (__test_ea(hdr->len))
1727 skb_pull(skb, 3);
1728 else
1729 skb_pull(skb, 4);
1730
1731 switch (type) {
1732 case RFCOMM_SABM:
1733 if (__test_pf(hdr->ctrl))
1734 rfcomm_recv_sabm(s, dlci);
1735 break;
1736
1737 case RFCOMM_DISC:
1738 if (__test_pf(hdr->ctrl))
1739 s = rfcomm_recv_disc(s, dlci);
1740 break;
1741
1742 case RFCOMM_UA:
1743 if (__test_pf(hdr->ctrl))
1744 s = rfcomm_recv_ua(s, dlci);
1745 break;
1746
1747 case RFCOMM_DM:
1748 s = rfcomm_recv_dm(s, dlci);
1749 break;
1750
1751 case RFCOMM_UIH:
1752 if (dlci) {
1753 rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
1754 return s;
1755 }
1756 rfcomm_recv_mcc(s, skb);
1757 break;
1758
1759 default:
1760 BT_ERR("Unknown packet type 0x%02x", type);
1761 break;
1762 }
1763 kfree_skb(skb);
1764 return s;
1765}
1766
1767/* ---- Connection and data processing ---- */
1768
1769static void rfcomm_process_connect(struct rfcomm_session *s)
1770{
1771 struct rfcomm_dlc *d, *n;
1772
1773 BT_DBG("session %p state %ld", s, s->state);
1774
1775 list_for_each_entry_safe(d, n, &s->dlcs, list) {
1776 if (d->state == BT_CONFIG) {
1777 d->mtu = s->mtu;
1778 if (rfcomm_check_security(d)) {
1779 rfcomm_send_pn(s, 1, d);
1780 } else {
1781 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1782 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1783 }
1784 }
1785 }
1786}
1787
1788/* Send data queued for the DLC.
1789 * Return number of frames left in the queue.
1790 */
1791static int rfcomm_process_tx(struct rfcomm_dlc *d)
1792{
1793 struct sk_buff *skb;
1794 int err;
1795
1796 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
1797 d, d->state, d->cfc, d->rx_credits, d->tx_credits);
1798
1799 /* Send pending MSC */
1800 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
1801 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1802
1803 if (d->cfc) {
1804 /* CFC enabled.
1805 * Give them some credits */
1806 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
1807 d->rx_credits <= (d->cfc >> 2)) {
1808 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits);
1809 d->rx_credits = d->cfc;
1810 }
1811 } else {
1812 /* CFC disabled.
1813 * Give ourselves some credits */
1814 d->tx_credits = 5;
1815 }
1816
1817 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags))
1818 return skb_queue_len(&d->tx_queue);
1819
1820 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) {
1821 err = rfcomm_send_frame(d->session, skb->data, skb->len);
1822 if (err < 0) {
1823 skb_queue_head(&d->tx_queue, skb);
1824 break;
1825 }
1826 kfree_skb(skb);
1827 d->tx_credits--;
1828 }
1829
1830 if (d->cfc && !d->tx_credits) {
1831 /* We're out of TX credits.
1832 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
1833 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1834 }
1835
1836 return skb_queue_len(&d->tx_queue);
1837}
1838
1839static void rfcomm_process_dlcs(struct rfcomm_session *s)
1840{
1841 struct rfcomm_dlc *d, *n;
1842
1843 BT_DBG("session %p state %ld", s, s->state);
1844
1845 list_for_each_entry_safe(d, n, &s->dlcs, list) {
1846 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
1847 __rfcomm_dlc_close(d, ETIMEDOUT);
1848 continue;
1849 }
1850
1851 if (test_bit(RFCOMM_ENC_DROP, &d->flags)) {
1852 __rfcomm_dlc_close(d, ECONNREFUSED);
1853 continue;
1854 }
1855
1856 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) {
1857 rfcomm_dlc_clear_timer(d);
1858 if (d->out) {
1859 rfcomm_send_pn(s, 1, d);
1860 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
1861 } else {
1862 if (d->defer_setup) {
1863 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1864 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1865
1866 rfcomm_dlc_lock(d);
1867 d->state = BT_CONNECT2;
1868 d->state_change(d, 0);
1869 rfcomm_dlc_unlock(d);
1870 } else
1871 rfcomm_dlc_accept(d);
1872 }
1873 continue;
1874 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
1875 rfcomm_dlc_clear_timer(d);
1876 if (!d->out)
1877 rfcomm_send_dm(s, d->dlci);
1878 else
1879 d->state = BT_CLOSED;
1880 __rfcomm_dlc_close(d, ECONNREFUSED);
1881 continue;
1882 }
1883
1884 if (test_bit(RFCOMM_SEC_PENDING, &d->flags))
1885 continue;
1886
1887 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
1888 continue;
1889
1890 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
1891 d->mscex == RFCOMM_MSCEX_OK)
1892 rfcomm_process_tx(d);
1893 }
1894}
1895
1896static struct rfcomm_session *rfcomm_process_rx(struct rfcomm_session *s)
1897{
1898 struct socket *sock = s->sock;
1899 struct sock *sk = sock->sk;
1900 struct sk_buff *skb;
1901
1902 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue));
1903
1904 /* Get data directly from socket receive queue without copying it. */
1905 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
1906 skb_orphan(skb);
1907 if (!skb_linearize(skb)) {
1908 s = rfcomm_recv_frame(s, skb);
1909 if (!s)
1910 break;
1911 } else {
1912 kfree_skb(skb);
1913 }
1914 }
1915
1916 if (s && (sk->sk_state == BT_CLOSED))
1917 s = rfcomm_session_close(s, sk->sk_err);
1918
1919 return s;
1920}
1921
1922static void rfcomm_accept_connection(struct rfcomm_session *s)
1923{
1924 struct socket *sock = s->sock, *nsock;
1925 int err;
1926
1927 /* Fast check for a new connection.
1928 * Avoids unnesesary socket allocations. */
1929 if (list_empty(&bt_sk(sock->sk)->accept_q))
1930 return;
1931
1932 BT_DBG("session %p", s);
1933
1934 err = kernel_accept(sock, &nsock, O_NONBLOCK);
1935 if (err < 0)
1936 return;
1937
1938 /* Set our callbacks */
1939 nsock->sk->sk_data_ready = rfcomm_l2data_ready;
1940 nsock->sk->sk_state_change = rfcomm_l2state_change;
1941
1942 s = rfcomm_session_add(nsock, BT_OPEN);
1943 if (s) {
1944 /* We should adjust MTU on incoming sessions.
1945 * L2CAP MTU minus UIH header and FCS. */
1946 s->mtu = min(l2cap_pi(nsock->sk)->chan->omtu,
1947 l2cap_pi(nsock->sk)->chan->imtu) - 5;
1948
1949 rfcomm_schedule();
1950 } else
1951 sock_release(nsock);
1952}
1953
1954static struct rfcomm_session *rfcomm_check_connection(struct rfcomm_session *s)
1955{
1956 struct sock *sk = s->sock->sk;
1957
1958 BT_DBG("%p state %ld", s, s->state);
1959
1960 switch (sk->sk_state) {
1961 case BT_CONNECTED:
1962 s->state = BT_CONNECT;
1963
1964 /* We can adjust MTU on outgoing sessions.
1965 * L2CAP MTU minus UIH header and FCS. */
1966 s->mtu = min(l2cap_pi(sk)->chan->omtu, l2cap_pi(sk)->chan->imtu) - 5;
1967
1968 rfcomm_send_sabm(s, 0);
1969 break;
1970
1971 case BT_CLOSED:
1972 s = rfcomm_session_close(s, sk->sk_err);
1973 break;
1974 }
1975 return s;
1976}
1977
1978static void rfcomm_process_sessions(void)
1979{
1980 struct rfcomm_session *s, *n;
1981
1982 rfcomm_lock();
1983
1984 list_for_each_entry_safe(s, n, &session_list, list) {
1985 if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
1986 s->state = BT_DISCONN;
1987 rfcomm_send_disc(s, 0);
1988 continue;
1989 }
1990
1991 switch (s->state) {
1992 case BT_LISTEN:
1993 rfcomm_accept_connection(s);
1994 continue;
1995
1996 case BT_BOUND:
1997 s = rfcomm_check_connection(s);
1998 break;
1999
2000 default:
2001 s = rfcomm_process_rx(s);
2002 break;
2003 }
2004
2005 if (s)
2006 rfcomm_process_dlcs(s);
2007 }
2008
2009 rfcomm_unlock();
2010}
2011
2012static int rfcomm_add_listener(bdaddr_t *ba)
2013{
2014 struct sockaddr_l2 addr;
2015 struct socket *sock;
2016 struct sock *sk;
2017 struct rfcomm_session *s;
2018 int err = 0;
2019
2020 /* Create socket */
2021 err = rfcomm_l2sock_create(&sock);
2022 if (err < 0) {
2023 BT_ERR("Create socket failed %d", err);
2024 return err;
2025 }
2026
2027 /* Bind socket */
2028 bacpy(&addr.l2_bdaddr, ba);
2029 addr.l2_family = AF_BLUETOOTH;
2030 addr.l2_psm = cpu_to_le16(L2CAP_PSM_RFCOMM);
2031 addr.l2_cid = 0;
2032 addr.l2_bdaddr_type = BDADDR_BREDR;
2033 err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
2034 if (err < 0) {
2035 BT_ERR("Bind failed %d", err);
2036 goto failed;
2037 }
2038
2039 /* Set L2CAP options */
2040 sk = sock->sk;
2041 lock_sock(sk);
2042 l2cap_pi(sk)->chan->imtu = l2cap_mtu;
2043 release_sock(sk);
2044
2045 /* Start listening on the socket */
2046 err = kernel_listen(sock, 10);
2047 if (err) {
2048 BT_ERR("Listen failed %d", err);
2049 goto failed;
2050 }
2051
2052 /* Add listening session */
2053 s = rfcomm_session_add(sock, BT_LISTEN);
2054 if (!s) {
2055 err = -ENOMEM;
2056 goto failed;
2057 }
2058
2059 return 0;
2060failed:
2061 sock_release(sock);
2062 return err;
2063}
2064
2065static void rfcomm_kill_listener(void)
2066{
2067 struct rfcomm_session *s, *n;
2068
2069 BT_DBG("");
2070
2071 list_for_each_entry_safe(s, n, &session_list, list)
2072 rfcomm_session_del(s);
2073}
2074
2075static int rfcomm_run(void *unused)
2076{
2077 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2078 BT_DBG("");
2079
2080 set_user_nice(current, -10);
2081
2082 rfcomm_add_listener(BDADDR_ANY);
2083
2084 add_wait_queue(&rfcomm_wq, &wait);
2085 while (!kthread_should_stop()) {
2086
2087 /* Process stuff */
2088 rfcomm_process_sessions();
2089
2090 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
2091 }
2092 remove_wait_queue(&rfcomm_wq, &wait);
2093
2094 rfcomm_kill_listener();
2095
2096 return 0;
2097}
2098
2099static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
2100{
2101 struct rfcomm_session *s;
2102 struct rfcomm_dlc *d, *n;
2103
2104 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);
2105
2106 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
2107 if (!s)
2108 return;
2109
2110 list_for_each_entry_safe(d, n, &s->dlcs, list) {
2111 if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) {
2112 rfcomm_dlc_clear_timer(d);
2113 if (status || encrypt == 0x00) {
2114 set_bit(RFCOMM_ENC_DROP, &d->flags);
2115 continue;
2116 }
2117 }
2118
2119 if (d->state == BT_CONNECTED && !status && encrypt == 0x00) {
2120 if (d->sec_level == BT_SECURITY_MEDIUM) {
2121 set_bit(RFCOMM_SEC_PENDING, &d->flags);
2122 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
2123 continue;
2124 } else if (d->sec_level == BT_SECURITY_HIGH ||
2125 d->sec_level == BT_SECURITY_FIPS) {
2126 set_bit(RFCOMM_ENC_DROP, &d->flags);
2127 continue;
2128 }
2129 }
2130
2131 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
2132 continue;
2133
2134 if (!status && hci_conn_check_secure(conn, d->sec_level))
2135 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
2136 else
2137 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
2138 }
2139
2140 rfcomm_schedule();
2141}
2142
2143static struct hci_cb rfcomm_cb = {
2144 .name = "RFCOMM",
2145 .security_cfm = rfcomm_security_cfm
2146};
2147
2148static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x)
2149{
2150 struct rfcomm_session *s;
2151
2152 rfcomm_lock();
2153
2154 list_for_each_entry(s, &session_list, list) {
2155 struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan;
2156 struct rfcomm_dlc *d;
2157 list_for_each_entry(d, &s->dlcs, list) {
2158 seq_printf(f, "%pMR %pMR %ld %d %d %d %d\n",
2159 &chan->src, &chan->dst,
2160 d->state, d->dlci, d->mtu,
2161 d->rx_credits, d->tx_credits);
2162 }
2163 }
2164
2165 rfcomm_unlock();
2166
2167 return 0;
2168}
2169
2170DEFINE_SHOW_ATTRIBUTE(rfcomm_dlc_debugfs);
2171
2172static struct dentry *rfcomm_dlc_debugfs;
2173
2174/* ---- Initialization ---- */
2175static int __init rfcomm_init(void)
2176{
2177 int err;
2178
2179 hci_register_cb(&rfcomm_cb);
2180
2181 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
2182 if (IS_ERR(rfcomm_thread)) {
2183 err = PTR_ERR(rfcomm_thread);
2184 goto unregister;
2185 }
2186
2187 err = rfcomm_init_ttys();
2188 if (err < 0)
2189 goto stop;
2190
2191 err = rfcomm_init_sockets();
2192 if (err < 0)
2193 goto cleanup;
2194
2195 BT_INFO("RFCOMM ver %s", VERSION);
2196
2197 if (IS_ERR_OR_NULL(bt_debugfs))
2198 return 0;
2199
2200 rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444,
2201 bt_debugfs, NULL,
2202 &rfcomm_dlc_debugfs_fops);
2203
2204 return 0;
2205
2206cleanup:
2207 rfcomm_cleanup_ttys();
2208
2209stop:
2210 kthread_stop(rfcomm_thread);
2211
2212unregister:
2213 hci_unregister_cb(&rfcomm_cb);
2214
2215 return err;
2216}
2217
2218static void __exit rfcomm_exit(void)
2219{
2220 debugfs_remove(rfcomm_dlc_debugfs);
2221
2222 hci_unregister_cb(&rfcomm_cb);
2223
2224 kthread_stop(rfcomm_thread);
2225
2226 rfcomm_cleanup_ttys();
2227
2228 rfcomm_cleanup_sockets();
2229}
2230
2231module_init(rfcomm_init);
2232module_exit(rfcomm_exit);
2233
2234module_param(disable_cfc, bool, 0644);
2235MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
2236
2237module_param(channel_mtu, int, 0644);
2238MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
2239
2240module_param(l2cap_mtu, uint, 0644);
2241MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");
2242
2243module_param(l2cap_ertm, bool, 0644);
2244MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection");
2245
2246MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
2247MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
2248MODULE_VERSION(VERSION);
2249MODULE_LICENSE("GPL");
2250MODULE_ALIAS("bt-proto-3");