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