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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / net / bluetooth / rfcomm / core.c
blob38b618c96de64a13a1d724a954352cec27264fae
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
54 static int disable_cfc;
55 static int l2cap_ertm;
56 static int channel_mtu = -1;
57 static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
58
59 static struct task_struct *rfcomm_thread;
60
61 static DEFINE_MUTEX(rfcomm_mutex);
62 #define rfcomm_lock() mutex_lock(&rfcomm_mutex)
63 #define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
64
65
66 static LIST_HEAD(session_list);
67
68 static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
69 static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
70 static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
71 static int rfcomm_queue_disc(struct rfcomm_dlc *d);
72 static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
73 static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
74 static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
75 static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
76 static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
77 static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
78
79 static void rfcomm_process_connect(struct rfcomm_session *s);
80
81 static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
82 bdaddr_t *dst,
83 u8 sec_level,
84 int *err);
85 static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
86 static 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
118 static inline void rfcomm_schedule(void)
119 {
120 if (!rfcomm_thread)
121 return;
122 wake_up_process(rfcomm_thread);
123 }
124
125 static 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 */
134 static 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 */
180 static inline u8 __fcs(u8 *data)
181 {
182 return 0xff - __crc(data);
183 }
184
185 /* FCS on 3 bytes */
186 static inline u8 __fcs2(u8 *data)
187 {
188 return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]];
189 }
190
191 /* Check FCS */
192 static 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 ---- */
203 static void rfcomm_l2state_change(struct sock *sk)
204 {
205 BT_DBG("%p state %d", sk, sk->sk_state);
206 rfcomm_schedule();
207 }
208
209 static void rfcomm_l2data_ready(struct sock *sk, int bytes)
210 {
211 BT_DBG("%p bytes %d", sk, bytes);
212 rfcomm_schedule();
213 }
214
215 static 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
230 static 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
252 static 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
262 static 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
270 static 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 ---- */
279 static 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
290 static 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
298 static 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
306 static 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
321 struct 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
341 void 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
349 static 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
361 static 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
377 static 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
390 static 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
444 int 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
456 static 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
510 int 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
522 int 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
542 void __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
553 void __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 */
569 int 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
587 int 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 ---- */
597 static 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
628 static 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
647 static 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
663 static 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
685 static 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
737 failed:
738 sock_release(sock);
739 return NULL;
740 }
741
742 void 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 ---- */
752 static 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
765 static 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
779 static 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
793 static 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
807 static 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
829 static 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
843 static 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
868 static 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
910 int 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
948 static 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
975 static 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
1002 static 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
1024 static 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
1046 static 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
1078 static 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
1097 static 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 ---- */
1118 static 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
1174 static 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
1204 static 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
1240 void 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
1262 static 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
1281 static 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
1323 static 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
1352 static 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
1404 static 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
1503 rpn_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
1510 static 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
1529 static 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
1565 static 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
1625 static 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
1653 drop:
1654 kfree_skb(skb);
1655 return 0;
1656 }
1657
1658 static 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
1718 static 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 */
1742 static 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
1790 static 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
1845 static 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 if (!skb_linearize(skb))
1857 rfcomm_recv_frame(s, skb);
1858 else
1859 kfree_skb(skb);
1860 }
1861
1862 if (sk->sk_state == BT_CLOSED) {
1863 if (!s->initiator)
1864 rfcomm_session_put(s);
1865
1866 rfcomm_session_close(s, sk->sk_err);
1867 }
1868 }
1869
1870 static inline void rfcomm_accept_connection(struct rfcomm_session *s)
1871 {
1872 struct socket *sock = s->sock, *nsock;
1873 int err;
1874
1875 /* Fast check for a new connection.
1876 * Avoids unnesesary socket allocations. */
1877 if (list_empty(&bt_sk(sock->sk)->accept_q))
1878 return;
1879
1880 BT_DBG("session %p", s);
1881
1882 err = kernel_accept(sock, &nsock, O_NONBLOCK);
1883 if (err < 0)
1884 return;
1885
1886 /* Set our callbacks */
1887 nsock->sk->sk_data_ready = rfcomm_l2data_ready;
1888 nsock->sk->sk_state_change = rfcomm_l2state_change;
1889
1890 s = rfcomm_session_add(nsock, BT_OPEN);
1891 if (s) {
1892 rfcomm_session_hold(s);
1893
1894 /* We should adjust MTU on incoming sessions.
1895 * L2CAP MTU minus UIH header and FCS. */
1896 s->mtu = min(l2cap_pi(nsock->sk)->chan->omtu,
1897 l2cap_pi(nsock->sk)->chan->imtu) - 5;
1898
1899 rfcomm_schedule();
1900 } else
1901 sock_release(nsock);
1902 }
1903
1904 static inline void rfcomm_check_connection(struct rfcomm_session *s)
1905 {
1906 struct sock *sk = s->sock->sk;
1907
1908 BT_DBG("%p state %ld", s, s->state);
1909
1910 switch (sk->sk_state) {
1911 case BT_CONNECTED:
1912 s->state = BT_CONNECT;
1913
1914 /* We can adjust MTU on outgoing sessions.
1915 * L2CAP MTU minus UIH header and FCS. */
1916 s->mtu = min(l2cap_pi(sk)->chan->omtu, l2cap_pi(sk)->chan->imtu) - 5;
1917
1918 rfcomm_send_sabm(s, 0);
1919 break;
1920
1921 case BT_CLOSED:
1922 s->state = BT_CLOSED;
1923 rfcomm_session_close(s, sk->sk_err);
1924 break;
1925 }
1926 }
1927
1928 static inline void rfcomm_process_sessions(void)
1929 {
1930 struct list_head *p, *n;
1931
1932 rfcomm_lock();
1933
1934 list_for_each_safe(p, n, &session_list) {
1935 struct rfcomm_session *s;
1936 s = list_entry(p, struct rfcomm_session, list);
1937
1938 if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
1939 s->state = BT_DISCONN;
1940 rfcomm_send_disc(s, 0);
1941 rfcomm_session_put(s);
1942 continue;
1943 }
1944
1945 if (s->state == BT_LISTEN) {
1946 rfcomm_accept_connection(s);
1947 continue;
1948 }
1949
1950 rfcomm_session_hold(s);
1951
1952 switch (s->state) {
1953 case BT_BOUND:
1954 rfcomm_check_connection(s);
1955 break;
1956
1957 default:
1958 rfcomm_process_rx(s);
1959 break;
1960 }
1961
1962 rfcomm_process_dlcs(s);
1963
1964 rfcomm_session_put(s);
1965 }
1966
1967 rfcomm_unlock();
1968 }
1969
1970 static int rfcomm_add_listener(bdaddr_t *ba)
1971 {
1972 struct sockaddr_l2 addr;
1973 struct socket *sock;
1974 struct sock *sk;
1975 struct rfcomm_session *s;
1976 int err = 0;
1977
1978 /* Create socket */
1979 err = rfcomm_l2sock_create(&sock);
1980 if (err < 0) {
1981 BT_ERR("Create socket failed %d", err);
1982 return err;
1983 }
1984
1985 /* Bind socket */
1986 bacpy(&addr.l2_bdaddr, ba);
1987 addr.l2_family = AF_BLUETOOTH;
1988 addr.l2_psm = cpu_to_le16(RFCOMM_PSM);
1989 addr.l2_cid = 0;
1990 err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
1991 if (err < 0) {
1992 BT_ERR("Bind failed %d", err);
1993 goto failed;
1994 }
1995
1996 /* Set L2CAP options */
1997 sk = sock->sk;
1998 lock_sock(sk);
1999 l2cap_pi(sk)->chan->imtu = l2cap_mtu;
2000 release_sock(sk);
2001
2002 /* Start listening on the socket */
2003 err = kernel_listen(sock, 10);
2004 if (err) {
2005 BT_ERR("Listen failed %d", err);
2006 goto failed;
2007 }
2008
2009 /* Add listening session */
2010 s = rfcomm_session_add(sock, BT_LISTEN);
2011 if (!s)
2012 goto failed;
2013
2014 rfcomm_session_hold(s);
2015 return 0;
2016 failed:
2017 sock_release(sock);
2018 return err;
2019 }
2020
2021 static void rfcomm_kill_listener(void)
2022 {
2023 struct rfcomm_session *s;
2024 struct list_head *p, *n;
2025
2026 BT_DBG("");
2027
2028 list_for_each_safe(p, n, &session_list) {
2029 s = list_entry(p, struct rfcomm_session, list);
2030 rfcomm_session_del(s);
2031 }
2032 }
2033
2034 static int rfcomm_run(void *unused)
2035 {
2036 BT_DBG("");
2037
2038 set_user_nice(current, -10);
2039
2040 rfcomm_add_listener(BDADDR_ANY);
2041
2042 while (1) {
2043 set_current_state(TASK_INTERRUPTIBLE);
2044
2045 if (kthread_should_stop())
2046 break;
2047
2048 /* Process stuff */
2049 rfcomm_process_sessions();
2050
2051 schedule();
2052 }
2053 __set_current_state(TASK_RUNNING);
2054
2055 rfcomm_kill_listener();
2056
2057 return 0;
2058 }
2059
2060 static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
2061 {
2062 struct rfcomm_session *s;
2063 struct rfcomm_dlc *d;
2064 struct list_head *p, *n;
2065
2066 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);
2067
2068 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
2069 if (!s)
2070 return;
2071
2072 rfcomm_session_hold(s);
2073
2074 list_for_each_safe(p, n, &s->dlcs) {
2075 d = list_entry(p, struct rfcomm_dlc, list);
2076
2077 if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) {
2078 rfcomm_dlc_clear_timer(d);
2079 if (status || encrypt == 0x00) {
2080 __rfcomm_dlc_close(d, ECONNREFUSED);
2081 continue;
2082 }
2083 }
2084
2085 if (d->state == BT_CONNECTED && !status && encrypt == 0x00) {
2086 if (d->sec_level == BT_SECURITY_MEDIUM) {
2087 set_bit(RFCOMM_SEC_PENDING, &d->flags);
2088 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
2089 continue;
2090 } else if (d->sec_level == BT_SECURITY_HIGH) {
2091 __rfcomm_dlc_close(d, ECONNREFUSED);
2092 continue;
2093 }
2094 }
2095
2096 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
2097 continue;
2098
2099 if (!status && hci_conn_check_secure(conn, d->sec_level))
2100 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
2101 else
2102 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
2103 }
2104
2105 rfcomm_session_put(s);
2106
2107 rfcomm_schedule();
2108 }
2109
2110 static struct hci_cb rfcomm_cb = {
2111 .name = "RFCOMM",
2112 .security_cfm = rfcomm_security_cfm
2113 };
2114
2115 static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x)
2116 {
2117 struct rfcomm_session *s;
2118 struct list_head *pp, *p;
2119
2120 rfcomm_lock();
2121
2122 list_for_each(p, &session_list) {
2123 s = list_entry(p, struct rfcomm_session, list);
2124 list_for_each(pp, &s->dlcs) {
2125 struct sock *sk = s->sock->sk;
2126 struct rfcomm_dlc *d = list_entry(pp, struct rfcomm_dlc, list);
2127
2128 seq_printf(f, "%s %s %ld %d %d %d %d\n",
2129 batostr(&bt_sk(sk)->src),
2130 batostr(&bt_sk(sk)->dst),
2131 d->state, d->dlci, d->mtu,
2132 d->rx_credits, d->tx_credits);
2133 }
2134 }
2135
2136 rfcomm_unlock();
2137
2138 return 0;
2139 }
2140
2141 static int rfcomm_dlc_debugfs_open(struct inode *inode, struct file *file)
2142 {
2143 return single_open(file, rfcomm_dlc_debugfs_show, inode->i_private);
2144 }
2145
2146 static const struct file_operations rfcomm_dlc_debugfs_fops = {
2147 .open = rfcomm_dlc_debugfs_open,
2148 .read = seq_read,
2149 .llseek = seq_lseek,
2150 .release = single_release,
2151 };
2152
2153 static struct dentry *rfcomm_dlc_debugfs;
2154
2155 /* ---- Initialization ---- */
2156 static int __init rfcomm_init(void)
2157 {
2158 int err;
2159
2160 hci_register_cb(&rfcomm_cb);
2161
2162 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
2163 if (IS_ERR(rfcomm_thread)) {
2164 err = PTR_ERR(rfcomm_thread);
2165 goto unregister;
2166 }
2167
2168 if (bt_debugfs) {
2169 rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444,
2170 bt_debugfs, NULL, &rfcomm_dlc_debugfs_fops);
2171 if (!rfcomm_dlc_debugfs)
2172 BT_ERR("Failed to create RFCOMM debug file");
2173 }
2174
2175 err = rfcomm_init_ttys();
2176 if (err < 0)
2177 goto stop;
2178
2179 err = rfcomm_init_sockets();
2180 if (err < 0)
2181 goto cleanup;
2182
2183 BT_INFO("RFCOMM ver %s", VERSION);
2184
2185 return 0;
2186
2187 cleanup:
2188 rfcomm_cleanup_ttys();
2189
2190 stop:
2191 kthread_stop(rfcomm_thread);
2192
2193 unregister:
2194 hci_unregister_cb(&rfcomm_cb);
2195
2196 return err;
2197 }
2198
2199 static void __exit rfcomm_exit(void)
2200 {
2201 debugfs_remove(rfcomm_dlc_debugfs);
2202
2203 hci_unregister_cb(&rfcomm_cb);
2204
2205 kthread_stop(rfcomm_thread);
2206
2207 rfcomm_cleanup_ttys();
2208
2209 rfcomm_cleanup_sockets();
2210 }
2211
2212 module_init(rfcomm_init);
2213 module_exit(rfcomm_exit);
2214
2215 module_param(disable_cfc, bool, 0644);
2216 MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
2217
2218 module_param(channel_mtu, int, 0644);
2219 MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
2220
2221 module_param(l2cap_mtu, uint, 0644);
2222 MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");
2223
2224 module_param(l2cap_ertm, bool, 0644);
2225 MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection");
2226
2227 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
2228 MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
2229 MODULE_VERSION(VERSION);
2230 MODULE_LICENSE("GPL");
2231 MODULE_ALIAS("bt-proto-3");
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