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Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
[linux-2.6-block.git] / net / bluetooth / rfcomm / core.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 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
8e87d142
YH		 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
1da177e4
LT		 17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18
8e87d142
YH		 19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 21 SOFTWARE IS DISCLAIMED.
22*/
23
1da177e4
LT		 24/*
25 * Bluetooth RFCOMM core.
26 *
27 * $Id: core.c,v 1.42 2002/10/01 23:26:25 maxk Exp $
28 */
29
1da177e4
LT		 30#include <linux/module.h>
31#include <linux/errno.h>
32#include <linux/kernel.h>
33#include <linux/sched.h>
34#include <linux/signal.h>
35#include <linux/init.h>
36#include <linux/wait.h>
be9d1227 37#include <linux/device.h>
1da177e4 38#include <linux/net.h>
4a3e2f71 39#include <linux/mutex.h>
a524eccc 40#include <linux/kthread.h>
4a3e2f71 41
1da177e4
LT		 42#include <net/sock.h>
43#include <asm/uaccess.h>
44#include <asm/unaligned.h>
45
46#include <net/bluetooth/bluetooth.h>
47#include <net/bluetooth/hci_core.h>
48#include <net/bluetooth/l2cap.h>
49#include <net/bluetooth/rfcomm.h>
50
1da177e4
LT		 51#ifndef CONFIG_BT_RFCOMM_DEBUG
52#undef BT_DBG
53#define BT_DBG(D...)
54#endif
55
7c2660b0 56#define VERSION "1.8"
56f3a40a 57
7c2660b0 58static int disable_cfc = 0;
98bcd08b 59static int channel_mtu = -1;
56f3a40a
MH		 60static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
61
1da177e4
LT		 62static struct task_struct *rfcomm_thread;
63
4a3e2f71
AV		 64static DEFINE_MUTEX(rfcomm_mutex);
65#define rfcomm_lock() mutex_lock(&rfcomm_mutex)
66#define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
1da177e4
LT		 67
68static unsigned long rfcomm_event;
69
70static LIST_HEAD(session_list);
1da177e4
LT		 71
72static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
73static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
74static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
75static int rfcomm_queue_disc(struct rfcomm_dlc *d);
76static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
77static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
78static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
79static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
80static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
81static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
82
83static void rfcomm_process_connect(struct rfcomm_session *s);
84
85static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err);
86static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
87static void rfcomm_session_del(struct rfcomm_session *s);
88
89/* ---- RFCOMM frame parsing macros ---- */
90#define __get_dlci(b) ((b & 0xfc) >> 2)
91#define __get_channel(b) ((b & 0xf8) >> 3)
92#define __get_dir(b) ((b & 0x04) >> 2)
93#define __get_type(b) ((b & 0xef))
94
95#define __test_ea(b) ((b & 0x01))
96#define __test_cr(b) ((b & 0x02))
97#define __test_pf(b) ((b & 0x10))
98
99#define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
100#define __ctrl(type, pf) (((type & 0xef) | (pf << 4)))
101#define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir)
102#define __srv_channel(dlci) (dlci >> 1)
103#define __dir(dlci) (dlci & 0x01)
104
105#define __len8(len) (((len) << 1) | 1)
106#define __len16(len) ((len) << 1)
107
108/* MCC macros */
109#define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01))
110#define __get_mcc_type(b) ((b & 0xfc) >> 2)
111#define __get_mcc_len(b) ((b & 0xfe) >> 1)
112
113/* RPN macros */
3a5e903c 114#define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
1da177e4
LT		 115#define __get_rpn_data_bits(line) ((line) & 0x3)
116#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
3a5e903c 117#define __get_rpn_parity(line) (((line) >> 3) & 0x7)
1da177e4
LT		 118
119static inline void rfcomm_schedule(uint event)
120{
121 if (!rfcomm_thread)
122 return;
123 //set_bit(event, &rfcomm_event);
124 set_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
125 wake_up_process(rfcomm_thread);
126}
127
128static inline void rfcomm_session_put(struct rfcomm_session *s)
129{
130 if (atomic_dec_and_test(&s->refcnt))
131 rfcomm_session_del(s);
132}
133
134/* ---- RFCOMM FCS computation ---- */
135
408c1ce2 136/* reversed, 8-bit, poly=0x07 */
8e87d142 137static unsigned char rfcomm_crc_table[256] = {
408c1ce2
MH		 138 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
139 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
140 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
141 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
142
143 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
144 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
145 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
146 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
147
148 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
149 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
150 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
151 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
152
153 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
154 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
155 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
156 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
157
158 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
159 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
160 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
161 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
162
163 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
164 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
165 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
166 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
167
168 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
169 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
170 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
171 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
172
173 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
174 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
175 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
176 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
177};
178
1da177e4
LT		 179/* CRC on 2 bytes */
180#define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
181
8e87d142 182/* FCS on 2 bytes */
1da177e4
LT		 183static inline u8 __fcs(u8 *data)
184{
185 return (0xff - __crc(data));
186}
187
8e87d142 188/* FCS on 3 bytes */
1da177e4
LT		 189static inline u8 __fcs2(u8 *data)
190{
191 return (0xff - rfcomm_crc_table[__crc(data) ^ data[2]]);
192}
193
194/* Check FCS */
195static inline int __check_fcs(u8 *data, int type, u8 fcs)
196{
197 u8 f = __crc(data);
198
199 if (type != RFCOMM_UIH)
200 f = rfcomm_crc_table[f ^ data[2]];
201
202 return rfcomm_crc_table[f ^ fcs] != 0xcf;
203}
204
205/* ---- L2CAP callbacks ---- */
206static void rfcomm_l2state_change(struct sock *sk)
207{
208 BT_DBG("%p state %d", sk, sk->sk_state);
209 rfcomm_schedule(RFCOMM_SCHED_STATE);
210}
211
212static void rfcomm_l2data_ready(struct sock *sk, int bytes)
213{
214 BT_DBG("%p bytes %d", sk, bytes);
215 rfcomm_schedule(RFCOMM_SCHED_RX);
216}
217
218static int rfcomm_l2sock_create(struct socket **sock)
219{
220 int err;
221
222 BT_DBG("");
223
224 err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
225 if (!err) {
226 struct sock *sk = (*sock)->sk;
227 sk->sk_data_ready = rfcomm_l2data_ready;
228 sk->sk_state_change = rfcomm_l2state_change;
229 }
230 return err;
231}
232
233/* ---- RFCOMM DLCs ---- */
234static void rfcomm_dlc_timeout(unsigned long arg)
235{
236 struct rfcomm_dlc *d = (void *) arg;
237
238 BT_DBG("dlc %p state %ld", d, d->state);
239
240 set_bit(RFCOMM_TIMED_OUT, &d->flags);
241 rfcomm_dlc_put(d);
242 rfcomm_schedule(RFCOMM_SCHED_TIMEO);
243}
244
245static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
246{
247 BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);
248
249 if (!mod_timer(&d->timer, jiffies + timeout))
250 rfcomm_dlc_hold(d);
251}
252
253static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
254{
255 BT_DBG("dlc %p state %ld", d, d->state);
256
257 if (timer_pending(&d->timer) && del_timer(&d->timer))
258 rfcomm_dlc_put(d);
259}
260
261static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
262{
263 BT_DBG("%p", d);
264
265 d->state = BT_OPEN;
266 d->flags = 0;
267 d->mscex = 0;
268 d->mtu = RFCOMM_DEFAULT_MTU;
269 d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV;
270
271 d->cfc = RFCOMM_CFC_DISABLED;
272 d->rx_credits = RFCOMM_DEFAULT_CREDITS;
273}
274
dd0fc66f 275struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
1da177e4 276{
25ea6db0
MH		 277 struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);
278
1da177e4
LT		 279 if (!d)
280 return NULL;
1da177e4
LT		 281
282 init_timer(&d->timer);
283 d->timer.function = rfcomm_dlc_timeout;
284 d->timer.data = (unsigned long) d;
285
286 skb_queue_head_init(&d->tx_queue);
287 spin_lock_init(&d->lock);
288 atomic_set(&d->refcnt, 1);
289
290 rfcomm_dlc_clear_state(d);
8e87d142 291
1da177e4 292 BT_DBG("%p", d);
25ea6db0 293
1da177e4
LT		 294 return d;
295}
296
297void rfcomm_dlc_free(struct rfcomm_dlc *d)
298{
299 BT_DBG("%p", d);
300
301 skb_queue_purge(&d->tx_queue);
302 kfree(d);
303}
304
305static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
306{
307 BT_DBG("dlc %p session %p", d, s);
308
309 rfcomm_session_hold(s);
310
311 rfcomm_dlc_hold(d);
312 list_add(&d->list, &s->dlcs);
313 d->session = s;
314}
315
316static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
317{
318 struct rfcomm_session *s = d->session;
319
320 BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s);
321
322 list_del(&d->list);
323 d->session = NULL;
324 rfcomm_dlc_put(d);
325
326 rfcomm_session_put(s);
327}
328
329static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
330{
331 struct rfcomm_dlc *d;
332 struct list_head *p;
333
334 list_for_each(p, &s->dlcs) {
335 d = list_entry(p, struct rfcomm_dlc, list);
336 if (d->dlci == dlci)
337 return d;
338 }
339 return NULL;
340}
341
342static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
343{
344 struct rfcomm_session *s;
345 int err = 0;
346 u8 dlci;
347
8e87d142 348 BT_DBG("dlc %p state %ld %s %s channel %d",
1da177e4
LT		 349 d, d->state, batostr(src), batostr(dst), channel);
350
351 if (channel < 1 || channel > 30)
352 return -EINVAL;
353
354 if (d->state != BT_OPEN && d->state != BT_CLOSED)
355 return 0;
356
357 s = rfcomm_session_get(src, dst);
358 if (!s) {
359 s = rfcomm_session_create(src, dst, &err);
360 if (!s)
361 return err;
362 }
363
364 dlci = __dlci(!s->initiator, channel);
365
366 /* Check if DLCI already exists */
367 if (rfcomm_dlc_get(s, dlci))
368 return -EBUSY;
369
370 rfcomm_dlc_clear_state(d);
371
372 d->dlci = dlci;
373 d->addr = __addr(s->initiator, dlci);
374 d->priority = 7;
375
376 d->state = BT_CONFIG;
377 rfcomm_dlc_link(s, d);
378
379 d->mtu = s->mtu;
380 d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;
381
382 if (s->state == BT_CONNECTED)
383 rfcomm_send_pn(s, 1, d);
384 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
385 return 0;
386}
387
388int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
389{
390 int r;
391
392 rfcomm_lock();
393
394 r = __rfcomm_dlc_open(d, src, dst, channel);
395
396 rfcomm_unlock();
397 return r;
398}
399
400static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
401{
402 struct rfcomm_session *s = d->session;
403 if (!s)
404 return 0;
405
406 BT_DBG("dlc %p state %ld dlci %d err %d session %p",
407 d, d->state, d->dlci, err, s);
408
409 switch (d->state) {
410 case BT_CONNECTED:
411 case BT_CONFIG:
412 case BT_CONNECT:
413 d->state = BT_DISCONN;
414 if (skb_queue_empty(&d->tx_queue)) {
415 rfcomm_send_disc(s, d->dlci);
416 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
417 } else {
418 rfcomm_queue_disc(d);
419 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
420 }
421 break;
422
423 default:
424 rfcomm_dlc_clear_timer(d);
425
426 rfcomm_dlc_lock(d);
427 d->state = BT_CLOSED;
428 d->state_change(d, err);
429 rfcomm_dlc_unlock(d);
430
431 skb_queue_purge(&d->tx_queue);
1da177e4
LT		 432 rfcomm_dlc_unlink(d);
433 }
434
435 return 0;
436}
437
438int rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
439{
440 int r;
441
442 rfcomm_lock();
443
444 r = __rfcomm_dlc_close(d, err);
445
446 rfcomm_unlock();
447 return r;
448}
449
450int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
451{
452 int len = skb->len;
453
454 if (d->state != BT_CONNECTED)
455 return -ENOTCONN;
456
457 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
458
459 if (len > d->mtu)
460 return -EINVAL;
461
462 rfcomm_make_uih(skb, d->addr);
463 skb_queue_tail(&d->tx_queue, skb);
464
465 if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
466 rfcomm_schedule(RFCOMM_SCHED_TX);
467 return len;
468}
469
470void fastcall __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
471{
472 BT_DBG("dlc %p state %ld", d, d->state);
473
474 if (!d->cfc) {
475 d->v24_sig |= RFCOMM_V24_FC;
476 set_bit(RFCOMM_MSC_PENDING, &d->flags);
477 }
478 rfcomm_schedule(RFCOMM_SCHED_TX);
479}
480
481void fastcall __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
482{
483 BT_DBG("dlc %p state %ld", d, d->state);
484
485 if (!d->cfc) {
486 d->v24_sig &= ~RFCOMM_V24_FC;
487 set_bit(RFCOMM_MSC_PENDING, &d->flags);
488 }
489 rfcomm_schedule(RFCOMM_SCHED_TX);
490}
491
8e87d142 492/*
1da177e4
LT		 493 Set/get modem status functions use _local_ status i.e. what we report
494 to the other side.
495 Remote status is provided by dlc->modem_status() callback.
496 */
497int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig)
498{
8e87d142 499 BT_DBG("dlc %p state %ld v24_sig 0x%x",
1da177e4
LT		 500 d, d->state, v24_sig);
501
502 if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
503 v24_sig |= RFCOMM_V24_FC;
504 else
505 v24_sig &= ~RFCOMM_V24_FC;
8e87d142 506
1da177e4
LT		 507 d->v24_sig = v24_sig;
508
509 if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags))
510 rfcomm_schedule(RFCOMM_SCHED_TX);
511
512 return 0;
513}
514
515int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig)
516{
8e87d142 517 BT_DBG("dlc %p state %ld v24_sig 0x%x",
1da177e4
LT		 518 d, d->state, d->v24_sig);
519
520 *v24_sig = d->v24_sig;
521 return 0;
522}
523
524/* ---- RFCOMM sessions ---- */
525static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
526{
25ea6db0
MH		 527 struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL);
528
1da177e4
LT		 529 if (!s)
530 return NULL;
1da177e4
LT		 531
532 BT_DBG("session %p sock %p", s, sock);
533
534 INIT_LIST_HEAD(&s->dlcs);
535 s->state = state;
536 s->sock = sock;
537
538 s->mtu = RFCOMM_DEFAULT_MTU;
7c2660b0 539 s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;
1da177e4
LT		 540
541 /* Do not increment module usage count for listening sessions.
542 * Otherwise we won't be able to unload the module. */
543 if (state != BT_LISTEN)
544 if (!try_module_get(THIS_MODULE)) {
545 kfree(s);
546 return NULL;
547 }
548
549 list_add(&s->list, &session_list);
550
551 return s;
552}
553
554static void rfcomm_session_del(struct rfcomm_session *s)
555{
556 int state = s->state;
557
558 BT_DBG("session %p state %ld", s, s->state);
559
560 list_del(&s->list);
561
562 if (state == BT_CONNECTED)
563 rfcomm_send_disc(s, 0);
564
565 sock_release(s->sock);
566 kfree(s);
567
568 if (state != BT_LISTEN)
569 module_put(THIS_MODULE);
570}
571
572static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst)
573{
574 struct rfcomm_session *s;
575 struct list_head *p, *n;
576 struct bt_sock *sk;
577 list_for_each_safe(p, n, &session_list) {
578 s = list_entry(p, struct rfcomm_session, list);
8e87d142 579 sk = bt_sk(s->sock->sk);
1da177e4
LT		 580
581 if ((!bacmp(src, BDADDR_ANY) || !bacmp(&sk->src, src)) &&
582 !bacmp(&sk->dst, dst))
583 return s;
584 }
585 return NULL;
586}
587
588static void rfcomm_session_close(struct rfcomm_session *s, int err)
589{
590 struct rfcomm_dlc *d;
591 struct list_head *p, *n;
592
593 BT_DBG("session %p state %ld err %d", s, s->state, err);
594
595 rfcomm_session_hold(s);
596
597 s->state = BT_CLOSED;
598
599 /* Close all dlcs */
600 list_for_each_safe(p, n, &s->dlcs) {
601 d = list_entry(p, struct rfcomm_dlc, list);
602 d->state = BT_CLOSED;
603 __rfcomm_dlc_close(d, err);
604 }
605
606 rfcomm_session_put(s);
607}
608
609static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err)
610{
611 struct rfcomm_session *s = NULL;
612 struct sockaddr_l2 addr;
613 struct socket *sock;
614 struct sock *sk;
615
616 BT_DBG("%s %s", batostr(src), batostr(dst));
617
618 *err = rfcomm_l2sock_create(&sock);
619 if (*err < 0)
620 return NULL;
621
622 bacpy(&addr.l2_bdaddr, src);
623 addr.l2_family = AF_BLUETOOTH;
624 addr.l2_psm = 0;
48db9ca4 625 *err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
1da177e4
LT		 626 if (*err < 0)
627 goto failed;
628
629 /* Set L2CAP options */
630 sk = sock->sk;
631 lock_sock(sk);
56f3a40a 632 l2cap_pi(sk)->imtu = l2cap_mtu;
1da177e4
LT		 633 release_sock(sk);
634
635 s = rfcomm_session_add(sock, BT_BOUND);
636 if (!s) {
637 *err = -ENOMEM;
638 goto failed;
639 }
640
1da177e4
LT		 641 s->initiator = 1;
642
643 bacpy(&addr.l2_bdaddr, dst);
644 addr.l2_family = AF_BLUETOOTH;
645 addr.l2_psm = htobs(RFCOMM_PSM);
48db9ca4 646 *err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
b4c612a4 647 if (*err == 0 || *err == -EINPROGRESS)
1da177e4
LT		 648 return s;
649
650 rfcomm_session_del(s);
651 return NULL;
652
653failed:
654 sock_release(sock);
655 return NULL;
656}
657
658void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst)
659{
660 struct sock *sk = s->sock->sk;
661 if (src)
662 bacpy(src, &bt_sk(sk)->src);
663 if (dst)
664 bacpy(dst, &bt_sk(sk)->dst);
665}
666
667/* ---- RFCOMM frame sending ---- */
668static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len)
669{
670 struct socket *sock = s->sock;
671 struct kvec iv = { data, len };
672 struct msghdr msg;
673
674 BT_DBG("session %p len %d", s, len);
675
676 memset(&msg, 0, sizeof(msg));
677
678 return kernel_sendmsg(sock, &msg, &iv, 1, len);
679}
680
681static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci)
682{
683 struct rfcomm_cmd cmd;
684
685 BT_DBG("%p dlci %d", s, dlci);
686
687 cmd.addr = __addr(s->initiator, dlci);
688 cmd.ctrl = __ctrl(RFCOMM_SABM, 1);
689 cmd.len = __len8(0);
690 cmd.fcs = __fcs2((u8 *) &cmd);
691
692 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
693}
694
695static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci)
696{
697 struct rfcomm_cmd cmd;
698
699 BT_DBG("%p dlci %d", s, dlci);
700
701 cmd.addr = __addr(!s->initiator, dlci);
702 cmd.ctrl = __ctrl(RFCOMM_UA, 1);
703 cmd.len = __len8(0);
704 cmd.fcs = __fcs2((u8 *) &cmd);
705
706 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
707}
708
709static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci)
710{
711 struct rfcomm_cmd cmd;
712
713 BT_DBG("%p dlci %d", s, dlci);
714
715 cmd.addr = __addr(s->initiator, dlci);
716 cmd.ctrl = __ctrl(RFCOMM_DISC, 1);
717 cmd.len = __len8(0);
718 cmd.fcs = __fcs2((u8 *) &cmd);
719
720 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
721}
722
723static int rfcomm_queue_disc(struct rfcomm_dlc *d)
724{
725 struct rfcomm_cmd *cmd;
726 struct sk_buff *skb;
727
728 BT_DBG("dlc %p dlci %d", d, d->dlci);
729
730 skb = alloc_skb(sizeof(*cmd), GFP_KERNEL);
731 if (!skb)
732 return -ENOMEM;
733
734 cmd = (void *) __skb_put(skb, sizeof(*cmd));
735 cmd->addr = d->addr;
736 cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
737 cmd->len = __len8(0);
738 cmd->fcs = __fcs2((u8 *) cmd);
739
740 skb_queue_tail(&d->tx_queue, skb);
741 rfcomm_schedule(RFCOMM_SCHED_TX);
742 return 0;
743}
744
745static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci)
746{
747 struct rfcomm_cmd cmd;
748
749 BT_DBG("%p dlci %d", s, dlci);
750
751 cmd.addr = __addr(!s->initiator, dlci);
752 cmd.ctrl = __ctrl(RFCOMM_DM, 1);
753 cmd.len = __len8(0);
754 cmd.fcs = __fcs2((u8 *) &cmd);
755
756 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
757}
758
759static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type)
760{
761 struct rfcomm_hdr *hdr;
762 struct rfcomm_mcc *mcc;
763 u8 buf[16], *ptr = buf;
764
765 BT_DBG("%p cr %d type %d", s, cr, type);
766
767 hdr = (void *) ptr; ptr += sizeof(*hdr);
768 hdr->addr = __addr(s->initiator, 0);
769 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
770 hdr->len = __len8(sizeof(*mcc) + 1);
771
772 mcc = (void *) ptr; ptr += sizeof(*mcc);
773 mcc->type = __mcc_type(cr, RFCOMM_NSC);
774 mcc->len = __len8(1);
775
776 /* Type that we didn't like */
777 *ptr = __mcc_type(cr, type); ptr++;
778
779 *ptr = __fcs(buf); ptr++;
780
781 return rfcomm_send_frame(s, buf, ptr - buf);
782}
783
784static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d)
785{
786 struct rfcomm_hdr *hdr;
787 struct rfcomm_mcc *mcc;
788 struct rfcomm_pn *pn;
789 u8 buf[16], *ptr = buf;
790
791 BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu);
792
793 hdr = (void *) ptr; ptr += sizeof(*hdr);
794 hdr->addr = __addr(s->initiator, 0);
795 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
796 hdr->len = __len8(sizeof(*mcc) + sizeof(*pn));
797
798 mcc = (void *) ptr; ptr += sizeof(*mcc);
799 mcc->type = __mcc_type(cr, RFCOMM_PN);
800 mcc->len = __len8(sizeof(*pn));
801
802 pn = (void *) ptr; ptr += sizeof(*pn);
803 pn->dlci = d->dlci;
804 pn->priority = d->priority;
805 pn->ack_timer = 0;
806 pn->max_retrans = 0;
807
808 if (s->cfc) {
809 pn->flow_ctrl = cr ? 0xf0 : 0xe0;
810 pn->credits = RFCOMM_DEFAULT_CREDITS;
811 } else {
812 pn->flow_ctrl = 0;
813 pn->credits = 0;
814 }
815
98bcd08b
MH		 816 if (cr && channel_mtu >= 0)
817 pn->mtu = htobs(channel_mtu);
818 else
819 pn->mtu = htobs(d->mtu);
1da177e4
LT		 820
821 *ptr = __fcs(buf); ptr++;
822
823 return rfcomm_send_frame(s, buf, ptr - buf);
824}
825
3a5e903c
S		 826int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
827 u8 bit_rate, u8 data_bits, u8 stop_bits,
8e87d142 828 u8 parity, u8 flow_ctrl_settings,
3a5e903c 829 u8 xon_char, u8 xoff_char, u16 param_mask)
1da177e4
LT		 830{
831 struct rfcomm_hdr *hdr;
832 struct rfcomm_mcc *mcc;
833 struct rfcomm_rpn *rpn;
834 u8 buf[16], *ptr = buf;
835
836 BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x"
8e87d142
YH		 837 " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x",
838 s, cr, dlci, bit_rate, data_bits, stop_bits, parity,
3a5e903c 839 flow_ctrl_settings, xon_char, xoff_char, param_mask);
1da177e4
LT		 840
841 hdr = (void *) ptr; ptr += sizeof(*hdr);
842 hdr->addr = __addr(s->initiator, 0);
843 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
844 hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn));
845
846 mcc = (void *) ptr; ptr += sizeof(*mcc);
847 mcc->type = __mcc_type(cr, RFCOMM_RPN);
848 mcc->len = __len8(sizeof(*rpn));
849
850 rpn = (void *) ptr; ptr += sizeof(*rpn);
851 rpn->dlci = __addr(1, dlci);
852 rpn->bit_rate = bit_rate;
853 rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity);
854 rpn->flow_ctrl = flow_ctrl_settings;
855 rpn->xon_char = xon_char;
856 rpn->xoff_char = xoff_char;
e8db8c99 857 rpn->param_mask = cpu_to_le16(param_mask);
1da177e4
LT		 858
859 *ptr = __fcs(buf); ptr++;
860
861 return rfcomm_send_frame(s, buf, ptr - buf);
862}
863
864static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status)
865{
866 struct rfcomm_hdr *hdr;
867 struct rfcomm_mcc *mcc;
868 struct rfcomm_rls *rls;
869 u8 buf[16], *ptr = buf;
870
871 BT_DBG("%p cr %d status 0x%x", s, cr, status);
872
873 hdr = (void *) ptr; ptr += sizeof(*hdr);
874 hdr->addr = __addr(s->initiator, 0);
875 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
876 hdr->len = __len8(sizeof(*mcc) + sizeof(*rls));
877
878 mcc = (void *) ptr; ptr += sizeof(*mcc);
879 mcc->type = __mcc_type(cr, RFCOMM_RLS);
880 mcc->len = __len8(sizeof(*rls));
881
882 rls = (void *) ptr; ptr += sizeof(*rls);
883 rls->dlci = __addr(1, dlci);
884 rls->status = status;
885
886 *ptr = __fcs(buf); ptr++;
887
888 return rfcomm_send_frame(s, buf, ptr - buf);
889}
890
891static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig)
892{
893 struct rfcomm_hdr *hdr;
894 struct rfcomm_mcc *mcc;
895 struct rfcomm_msc *msc;
896 u8 buf[16], *ptr = buf;
897
898 BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig);
899
900 hdr = (void *) ptr; ptr += sizeof(*hdr);
901 hdr->addr = __addr(s->initiator, 0);
902 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
903 hdr->len = __len8(sizeof(*mcc) + sizeof(*msc));
904
905 mcc = (void *) ptr; ptr += sizeof(*mcc);
906 mcc->type = __mcc_type(cr, RFCOMM_MSC);
907 mcc->len = __len8(sizeof(*msc));
908
909 msc = (void *) ptr; ptr += sizeof(*msc);
910 msc->dlci = __addr(1, dlci);
911 msc->v24_sig = v24_sig | 0x01;
912
913 *ptr = __fcs(buf); ptr++;
914
915 return rfcomm_send_frame(s, buf, ptr - buf);
916}
917
918static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr)
919{
920 struct rfcomm_hdr *hdr;
921 struct rfcomm_mcc *mcc;
922 u8 buf[16], *ptr = buf;
923
924 BT_DBG("%p cr %d", s, cr);
925
926 hdr = (void *) ptr; ptr += sizeof(*hdr);
927 hdr->addr = __addr(s->initiator, 0);
928 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
929 hdr->len = __len8(sizeof(*mcc));
930
931 mcc = (void *) ptr; ptr += sizeof(*mcc);
932 mcc->type = __mcc_type(cr, RFCOMM_FCOFF);
933 mcc->len = __len8(0);
934
935 *ptr = __fcs(buf); ptr++;
936
937 return rfcomm_send_frame(s, buf, ptr - buf);
938}
939
940static int rfcomm_send_fcon(struct rfcomm_session *s, int cr)
941{
942 struct rfcomm_hdr *hdr;
943 struct rfcomm_mcc *mcc;
944 u8 buf[16], *ptr = buf;
945
946 BT_DBG("%p cr %d", s, cr);
947
948 hdr = (void *) ptr; ptr += sizeof(*hdr);
949 hdr->addr = __addr(s->initiator, 0);
950 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
951 hdr->len = __len8(sizeof(*mcc));
952
953 mcc = (void *) ptr; ptr += sizeof(*mcc);
954 mcc->type = __mcc_type(cr, RFCOMM_FCON);
955 mcc->len = __len8(0);
956
957 *ptr = __fcs(buf); ptr++;
958
959 return rfcomm_send_frame(s, buf, ptr - buf);
960}
961
962static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len)
963{
964 struct socket *sock = s->sock;
965 struct kvec iv[3];
966 struct msghdr msg;
967 unsigned char hdr[5], crc[1];
968
969 if (len > 125)
970 return -EINVAL;
971
972 BT_DBG("%p cr %d", s, cr);
973
974 hdr[0] = __addr(s->initiator, 0);
975 hdr[1] = __ctrl(RFCOMM_UIH, 0);
976 hdr[2] = 0x01 | ((len + 2) << 1);
977 hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2);
978 hdr[4] = 0x01 | (len << 1);
979
980 crc[0] = __fcs(hdr);
981
982 iv[0].iov_base = hdr;
983 iv[0].iov_len = 5;
984 iv[1].iov_base = pattern;
985 iv[1].iov_len = len;
986 iv[2].iov_base = crc;
987 iv[2].iov_len = 1;
988
989 memset(&msg, 0, sizeof(msg));
990
991 return kernel_sendmsg(sock, &msg, iv, 3, 6 + len);
992}
993
994static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits)
995{
996 struct rfcomm_hdr *hdr;
997 u8 buf[16], *ptr = buf;
998
999 BT_DBG("%p addr %d credits %d", s, addr, credits);
1000
1001 hdr = (void *) ptr; ptr += sizeof(*hdr);
1002 hdr->addr = addr;
1003 hdr->ctrl = __ctrl(RFCOMM_UIH, 1);
1004 hdr->len = __len8(0);
1005
1006 *ptr = credits; ptr++;
1007
1008 *ptr = __fcs(buf); ptr++;
1009
1010 return rfcomm_send_frame(s, buf, ptr - buf);
1011}
1012
1013static void rfcomm_make_uih(struct sk_buff *skb, u8 addr)
1014{
1015 struct rfcomm_hdr *hdr;
1016 int len = skb->len;
1017 u8 *crc;
1018
1019 if (len > 127) {
1020 hdr = (void *) skb_push(skb, 4);
6ba9c755 1021 put_unaligned(htobs(__len16(len)), (__le16 *) &hdr->len);
1da177e4
LT		 1022 } else {
1023 hdr = (void *) skb_push(skb, 3);
1024 hdr->len = __len8(len);
1025 }
1026 hdr->addr = addr;
1027 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1028
1029 crc = skb_put(skb, 1);
1030 *crc = __fcs((void *) hdr);
1031}
1032
1033/* ---- RFCOMM frame reception ---- */
1034static int rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci)
1035{
1036 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1037
1038 if (dlci) {
1039 /* Data channel */
1040 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1041 if (!d) {
1042 rfcomm_send_dm(s, dlci);
1043 return 0;
1044 }
1045
1046 switch (d->state) {
1047 case BT_CONNECT:
1048 rfcomm_dlc_clear_timer(d);
1049
1050 rfcomm_dlc_lock(d);
1051 d->state = BT_CONNECTED;
1052 d->state_change(d, 0);
1053 rfcomm_dlc_unlock(d);
1054
1055 rfcomm_send_msc(s, 1, dlci, d->v24_sig);
1056 break;
1057
1058 case BT_DISCONN:
1059 d->state = BT_CLOSED;
1060 __rfcomm_dlc_close(d, 0);
9cf5b0ea
MH		 1061
1062 if (list_empty(&s->dlcs)) {
1063 s->state = BT_DISCONN;
1064 rfcomm_send_disc(s, 0);
1065 }
1066
1da177e4
LT		 1067 break;
1068 }
1069 } else {
1070 /* Control channel */
1071 switch (s->state) {
1072 case BT_CONNECT:
1073 s->state = BT_CONNECTED;
1074 rfcomm_process_connect(s);
1075 break;
9cf5b0ea
MH		 1076
1077 case BT_DISCONN:
1078 rfcomm_session_put(s);
1079 break;
1da177e4
LT		 1080 }
1081 }
1082 return 0;
1083}
1084
1085static int rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci)
1086{
1087 int err = 0;
1088
1089 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1090
1091 if (dlci) {
1092 /* Data DLC */
1093 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1094 if (d) {
1095 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1096 err = ECONNREFUSED;
1097 else
1098 err = ECONNRESET;
1099
1100 d->state = BT_CLOSED;
1101 __rfcomm_dlc_close(d, err);
1102 }
1103 } else {
1104 if (s->state == BT_CONNECT)
1105 err = ECONNREFUSED;
1106 else
1107 err = ECONNRESET;
1108
1109 s->state = BT_CLOSED;
1110 rfcomm_session_close(s, err);
1111 }
1112 return 0;
1113}
1114
1115static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci)
1116{
1117 int err = 0;
1118
1119 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1120
1121 if (dlci) {
1122 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1123 if (d) {
1124 rfcomm_send_ua(s, dlci);
1125
1126 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1127 err = ECONNREFUSED;
1128 else
1129 err = ECONNRESET;
1130
1131 d->state = BT_CLOSED;
1132 __rfcomm_dlc_close(d, err);
8e87d142 1133 } else
1da177e4 1134 rfcomm_send_dm(s, dlci);
8e87d142 1135
1da177e4
LT		 1136 } else {
1137 rfcomm_send_ua(s, 0);
1138
1139 if (s->state == BT_CONNECT)
1140 err = ECONNREFUSED;
1141 else
1142 err = ECONNRESET;
1143
1144 s->state = BT_CLOSED;
1145 rfcomm_session_close(s, err);
1146 }
1147
1148 return 0;
1149}
1150
1151static inline int rfcomm_check_link_mode(struct rfcomm_dlc *d)
1152{
1153 struct sock *sk = d->session->sock->sk;
1154
1155 if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) {
1156 if (!hci_conn_encrypt(l2cap_pi(sk)->conn->hcon))
1157 return 1;
1158 } else if (d->link_mode & RFCOMM_LM_AUTH) {
1159 if (!hci_conn_auth(l2cap_pi(sk)->conn->hcon))
1160 return 1;
1161 }
1162
1163 return 0;
1164}
1165
1166static void rfcomm_dlc_accept(struct rfcomm_dlc *d)
1167{
300b9397
MH		 1168 struct sock *sk = d->session->sock->sk;
1169
1da177e4
LT		 1170 BT_DBG("dlc %p", d);
1171
1172 rfcomm_send_ua(d->session, d->dlci);
1173
1174 rfcomm_dlc_lock(d);
1175 d->state = BT_CONNECTED;
1176 d->state_change(d, 0);
1177 rfcomm_dlc_unlock(d);
1178
300b9397
MH		 1179 if (d->link_mode & RFCOMM_LM_MASTER)
1180 hci_conn_switch_role(l2cap_pi(sk)->conn->hcon, 0x00);
1181
1da177e4
LT		 1182 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1183}
1184
1185static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
1186{
1187 struct rfcomm_dlc *d;
1188 u8 channel;
1189
1190 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1191
1192 if (!dlci) {
1193 rfcomm_send_ua(s, 0);
1194
1195 if (s->state == BT_OPEN) {
1196 s->state = BT_CONNECTED;
1197 rfcomm_process_connect(s);
1198 }
1199 return 0;
1200 }
1201
1202 /* Check if DLC exists */
1203 d = rfcomm_dlc_get(s, dlci);
1204 if (d) {
1205 if (d->state == BT_OPEN) {
1206 /* DLC was previously opened by PN request */
1207 if (rfcomm_check_link_mode(d)) {
1208 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1209 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1210 return 0;
1211 }
1212
1213 rfcomm_dlc_accept(d);
1214 }
1215 return 0;
1216 }
1217
1218 /* Notify socket layer about incoming connection */
1219 channel = __srv_channel(dlci);
1220 if (rfcomm_connect_ind(s, channel, &d)) {
1221 d->dlci = dlci;
1222 d->addr = __addr(s->initiator, dlci);
1223 rfcomm_dlc_link(s, d);
1224
1225 if (rfcomm_check_link_mode(d)) {
1226 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1227 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1228 return 0;
1229 }
1230
1231 rfcomm_dlc_accept(d);
1232 } else {
1233 rfcomm_send_dm(s, dlci);
1234 }
1235
1236 return 0;
1237}
1238
1239static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
1240{
1241 struct rfcomm_session *s = d->session;
1242
8e87d142 1243 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
1da177e4
LT		 1244 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);
1245
7c2660b0
MH		 1246 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
1247 pn->flow_ctrl == 0xe0) {
1248 d->cfc = RFCOMM_CFC_ENABLED;
1da177e4
LT		 1249 d->tx_credits = pn->credits;
1250 } else {
7c2660b0 1251 d->cfc = RFCOMM_CFC_DISABLED;
1da177e4
LT		 1252 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1253 }
1254
7c2660b0
MH		 1255 if (s->cfc == RFCOMM_CFC_UNKNOWN)
1256 s->cfc = d->cfc;
1257
1da177e4
LT		 1258 d->priority = pn->priority;
1259
98bcd08b
MH		 1260 d->mtu = btohs(pn->mtu);
1261
1262 if (cr && d->mtu > s->mtu)
1263 d->mtu = s->mtu;
1da177e4
LT		 1264
1265 return 0;
1266}
1267
1268static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1269{
1270 struct rfcomm_pn *pn = (void *) skb->data;
1271 struct rfcomm_dlc *d;
1272 u8 dlci = pn->dlci;
1273
1274 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1275
1276 if (!dlci)
1277 return 0;
1278
1279 d = rfcomm_dlc_get(s, dlci);
1280 if (d) {
1281 if (cr) {
1282 /* PN request */
1283 rfcomm_apply_pn(d, cr, pn);
1284 rfcomm_send_pn(s, 0, d);
1285 } else {
1286 /* PN response */
1287 switch (d->state) {
1288 case BT_CONFIG:
1289 rfcomm_apply_pn(d, cr, pn);
1290
1291 d->state = BT_CONNECT;
1292 rfcomm_send_sabm(s, d->dlci);
1293 break;
1294 }
1295 }
1296 } else {
1297 u8 channel = __srv_channel(dlci);
1298
1299 if (!cr)
1300 return 0;
1301
1302 /* PN request for non existing DLC.
1303 * Assume incoming connection. */
1304 if (rfcomm_connect_ind(s, channel, &d)) {
1305 d->dlci = dlci;
1306 d->addr = __addr(s->initiator, dlci);
1307 rfcomm_dlc_link(s, d);
1308
1309 rfcomm_apply_pn(d, cr, pn);
1310
1311 d->state = BT_OPEN;
1312 rfcomm_send_pn(s, 0, d);
1313 } else {
1314 rfcomm_send_dm(s, dlci);
1315 }
1316 }
1317 return 0;
1318}
1319
1320static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb)
1321{
1322 struct rfcomm_rpn *rpn = (void *) skb->data;
1323 u8 dlci = __get_dlci(rpn->dlci);
1324
1325 u8 bit_rate = 0;
1326 u8 data_bits = 0;
1327 u8 stop_bits = 0;
1328 u8 parity = 0;
1329 u8 flow_ctrl = 0;
1330 u8 xon_char = 0;
1331 u8 xoff_char = 0;
1332 u16 rpn_mask = RFCOMM_RPN_PM_ALL;
3a5e903c
S		 1333
1334 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",
1335 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl,
1336 rpn->xon_char, rpn->xoff_char, rpn->param_mask);
1337
1338 if (!cr)
1da177e4 1339 return 0;
3a5e903c 1340
1da177e4 1341 if (len == 1) {
3a5e903c 1342 /* This is a request, return default settings */
1da177e4
LT		 1343 bit_rate = RFCOMM_RPN_BR_115200;
1344 data_bits = RFCOMM_RPN_DATA_8;
1345 stop_bits = RFCOMM_RPN_STOP_1;
1346 parity = RFCOMM_RPN_PARITY_NONE;
1347 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1348 xon_char = RFCOMM_RPN_XON_CHAR;
1349 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1da177e4
LT		 1350 goto rpn_out;
1351 }
3a5e903c
S		 1352
1353 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
1354 * no parity, no flow control lines, normal XON/XOFF chars */
1355
e8db8c99 1356 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
1da177e4
LT		 1357 bit_rate = rpn->bit_rate;
1358 if (bit_rate != RFCOMM_RPN_BR_115200) {
1359 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
1360 bit_rate = RFCOMM_RPN_BR_115200;
1361 rpn_mask ^= RFCOMM_RPN_PM_BITRATE;
1362 }
1363 }
3a5e903c 1364
e8db8c99 1365 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
1da177e4
LT		 1366 data_bits = __get_rpn_data_bits(rpn->line_settings);
1367 if (data_bits != RFCOMM_RPN_DATA_8) {
1368 BT_DBG("RPN data bits mismatch 0x%x", data_bits);
1369 data_bits = RFCOMM_RPN_DATA_8;
1370 rpn_mask ^= RFCOMM_RPN_PM_DATA;
1371 }
1372 }
3a5e903c 1373
e8db8c99 1374 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
1da177e4
LT		 1375 stop_bits = __get_rpn_stop_bits(rpn->line_settings);
1376 if (stop_bits != RFCOMM_RPN_STOP_1) {
1377 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits);
1378 stop_bits = RFCOMM_RPN_STOP_1;
1379 rpn_mask ^= RFCOMM_RPN_PM_STOP;
1380 }
1381 }
3a5e903c 1382
e8db8c99 1383 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
1da177e4
LT		 1384 parity = __get_rpn_parity(rpn->line_settings);
1385 if (parity != RFCOMM_RPN_PARITY_NONE) {
1386 BT_DBG("RPN parity mismatch 0x%x", parity);
1387 parity = RFCOMM_RPN_PARITY_NONE;
1388 rpn_mask ^= RFCOMM_RPN_PM_PARITY;
1389 }
1390 }
3a5e903c 1391
e8db8c99 1392 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
1da177e4
LT		 1393 flow_ctrl = rpn->flow_ctrl;
1394 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
1395 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl);
1396 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1397 rpn_mask ^= RFCOMM_RPN_PM_FLOW;
1398 }
1399 }
3a5e903c 1400
e8db8c99 1401 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
1da177e4
LT		 1402 xon_char = rpn->xon_char;
1403 if (xon_char != RFCOMM_RPN_XON_CHAR) {
1404 BT_DBG("RPN XON char mismatch 0x%x", xon_char);
1405 xon_char = RFCOMM_RPN_XON_CHAR;
1406 rpn_mask ^= RFCOMM_RPN_PM_XON;
1407 }
1408 }
3a5e903c 1409
e8db8c99 1410 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
1da177e4
LT		 1411 xoff_char = rpn->xoff_char;
1412 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
1413 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char);
1414 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1415 rpn_mask ^= RFCOMM_RPN_PM_XOFF;
1416 }
1417 }
1418
1419rpn_out:
3a5e903c
S		 1420 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
1421 parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
1da177e4
LT		 1422
1423 return 0;
1424}
1425
1426static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1427{
1428 struct rfcomm_rls *rls = (void *) skb->data;
1429 u8 dlci = __get_dlci(rls->dlci);
1430
1431 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status);
3a5e903c 1432
1da177e4
LT		 1433 if (!cr)
1434 return 0;
1435
3a5e903c
S		 1436 /* We should probably do something with this information here. But
1437 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's
1438 * mandatory to recognise and respond to RLS */
1da177e4
LT		 1439
1440 rfcomm_send_rls(s, 0, dlci, rls->status);
1441
1442 return 0;
1443}
1444
1445static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1446{
1447 struct rfcomm_msc *msc = (void *) skb->data;
1448 struct rfcomm_dlc *d;
1449 u8 dlci = __get_dlci(msc->dlci);
1450
1451 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig);
1452
1453 d = rfcomm_dlc_get(s, dlci);
3a5e903c 1454 if (!d)
1da177e4
LT		 1455 return 0;
1456
1457 if (cr) {
1458 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
1459 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1460 else
1461 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
3a5e903c 1462
1da177e4
LT		 1463 rfcomm_dlc_lock(d);
1464 if (d->modem_status)
1465 d->modem_status(d, msc->v24_sig);
1466 rfcomm_dlc_unlock(d);
8e87d142 1467
1da177e4
LT		 1468 rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
1469
1470 d->mscex |= RFCOMM_MSCEX_RX;
3a5e903c 1471 } else
1da177e4
LT		 1472 d->mscex |= RFCOMM_MSCEX_TX;
1473
1474 return 0;
1475}
1476
1477static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb)
1478{
1479 struct rfcomm_mcc *mcc = (void *) skb->data;
1480 u8 type, cr, len;
1481
1482 cr = __test_cr(mcc->type);
1483 type = __get_mcc_type(mcc->type);
1484 len = __get_mcc_len(mcc->len);
1485
1486 BT_DBG("%p type 0x%x cr %d", s, type, cr);
1487
1488 skb_pull(skb, 2);
1489
1490 switch (type) {
1491 case RFCOMM_PN:
1492 rfcomm_recv_pn(s, cr, skb);
1493 break;
1494
1495 case RFCOMM_RPN:
1496 rfcomm_recv_rpn(s, cr, len, skb);
1497 break;
1498
1499 case RFCOMM_RLS:
1500 rfcomm_recv_rls(s, cr, skb);
1501 break;
1502
1503 case RFCOMM_MSC:
1504 rfcomm_recv_msc(s, cr, skb);
1505 break;
1506
1507 case RFCOMM_FCOFF:
1508 if (cr) {
1509 set_bit(RFCOMM_TX_THROTTLED, &s->flags);
1510 rfcomm_send_fcoff(s, 0);
1511 }
1512 break;
1513
1514 case RFCOMM_FCON:
1515 if (cr) {
1516 clear_bit(RFCOMM_TX_THROTTLED, &s->flags);
1517 rfcomm_send_fcon(s, 0);
1518 }
1519 break;
1520
1521 case RFCOMM_TEST:
1522 if (cr)
1523 rfcomm_send_test(s, 0, skb->data, skb->len);
1524 break;
1525
1526 case RFCOMM_NSC:
1527 break;
1528
1529 default:
1530 BT_ERR("Unknown control type 0x%02x", type);
1531 rfcomm_send_nsc(s, cr, type);
1532 break;
1533 }
1534 return 0;
1535}
1536
1537static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb)
1538{
1539 struct rfcomm_dlc *d;
1540
1541 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf);
1542
1543 d = rfcomm_dlc_get(s, dlci);
1544 if (!d) {
1545 rfcomm_send_dm(s, dlci);
1546 goto drop;
1547 }
1548
1549 if (pf && d->cfc) {
1550 u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);
1551
1552 d->tx_credits += credits;
1553 if (d->tx_credits)
1554 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1555 }
1556
1557 if (skb->len && d->state == BT_CONNECTED) {
1558 rfcomm_dlc_lock(d);
1559 d->rx_credits--;
1560 d->data_ready(d, skb);
1561 rfcomm_dlc_unlock(d);
1562 return 0;
1563 }
1564
1565drop:
1566 kfree_skb(skb);
1567 return 0;
1568}
1569
1570static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb)
1571{
1572 struct rfcomm_hdr *hdr = (void *) skb->data;
1573 u8 type, dlci, fcs;
1574
1575 dlci = __get_dlci(hdr->addr);
1576 type = __get_type(hdr->ctrl);
1577
1578 /* Trim FCS */
1579 skb->len--; skb->tail--;
27a884dc 1580 fcs = *(u8 *)skb_tail_pointer(skb);
1da177e4
LT		 1581
1582 if (__check_fcs(skb->data, type, fcs)) {
1583 BT_ERR("bad checksum in packet");
1584 kfree_skb(skb);
1585 return -EILSEQ;
1586 }
1587
1588 if (__test_ea(hdr->len))
1589 skb_pull(skb, 3);
1590 else
1591 skb_pull(skb, 4);
1592
1593 switch (type) {
1594 case RFCOMM_SABM:
1595 if (__test_pf(hdr->ctrl))
1596 rfcomm_recv_sabm(s, dlci);
1597 break;
1598
1599 case RFCOMM_DISC:
1600 if (__test_pf(hdr->ctrl))
1601 rfcomm_recv_disc(s, dlci);
1602 break;
1603
1604 case RFCOMM_UA:
1605 if (__test_pf(hdr->ctrl))
1606 rfcomm_recv_ua(s, dlci);
1607 break;
1608
1609 case RFCOMM_DM:
1610 rfcomm_recv_dm(s, dlci);
1611 break;
1612
1613 case RFCOMM_UIH:
1614 if (dlci)
1615 return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
1616
1617 rfcomm_recv_mcc(s, skb);
1618 break;
1619
1620 default:
1621 BT_ERR("Unknown packet type 0x%02x\n", type);
1622 break;
1623 }
1624 kfree_skb(skb);
1625 return 0;
1626}
1627
1628/* ---- Connection and data processing ---- */
1629
1630static void rfcomm_process_connect(struct rfcomm_session *s)
1631{
1632 struct rfcomm_dlc *d;
1633 struct list_head *p, *n;
1634
1635 BT_DBG("session %p state %ld", s, s->state);
1636
1637 list_for_each_safe(p, n, &s->dlcs) {
1638 d = list_entry(p, struct rfcomm_dlc, list);
1639 if (d->state == BT_CONFIG) {
1640 d->mtu = s->mtu;
1641 rfcomm_send_pn(s, 1, d);
1642 }
1643 }
1644}
1645
1646/* Send data queued for the DLC.
1647 * Return number of frames left in the queue.
1648 */
1649static inline int rfcomm_process_tx(struct rfcomm_dlc *d)
1650{
1651 struct sk_buff *skb;
1652 int err;
1653
8e87d142 1654 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
1da177e4
LT		 1655 d, d->state, d->cfc, d->rx_credits, d->tx_credits);
1656
1657 /* Send pending MSC */
1658 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
8e87d142 1659 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1da177e4
LT		 1660
1661 if (d->cfc) {
8e87d142 1662 /* CFC enabled.
1da177e4
LT		 1663 * Give them some credits */
1664 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
8e87d142 1665 d->rx_credits <= (d->cfc >> 2)) {
1da177e4
LT		 1666 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits);
1667 d->rx_credits = d->cfc;
1668 }
1669 } else {
1670 /* CFC disabled.
1671 * Give ourselves some credits */
1672 d->tx_credits = 5;
1673 }
1674
1675 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags))
1676 return skb_queue_len(&d->tx_queue);
1677
1678 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) {
1679 err = rfcomm_send_frame(d->session, skb->data, skb->len);
1680 if (err < 0) {
1681 skb_queue_head(&d->tx_queue, skb);
1682 break;
1683 }
1684 kfree_skb(skb);
1685 d->tx_credits--;
1686 }
1687
1688 if (d->cfc && !d->tx_credits) {
1689 /* We're out of TX credits.
1690 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
1691 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1692 }
1693
1694 return skb_queue_len(&d->tx_queue);
1695}
1696
1697static inline void rfcomm_process_dlcs(struct rfcomm_session *s)
1698{
1699 struct rfcomm_dlc *d;
1700 struct list_head *p, *n;
1701
1702 BT_DBG("session %p state %ld", s, s->state);
1703
1704 list_for_each_safe(p, n, &s->dlcs) {
1705 d = list_entry(p, struct rfcomm_dlc, list);
1706
1707 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
1708 __rfcomm_dlc_close(d, ETIMEDOUT);
1709 continue;
1710 }
1711
1712 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) {
1713 rfcomm_dlc_clear_timer(d);
1714 rfcomm_dlc_accept(d);
1715 if (d->link_mode & RFCOMM_LM_SECURE) {
1716 struct sock *sk = s->sock->sk;
1717 hci_conn_change_link_key(l2cap_pi(sk)->conn->hcon);
1718 }
1719 continue;
1720 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
1721 rfcomm_dlc_clear_timer(d);
1722 rfcomm_send_dm(s, d->dlci);
1723 __rfcomm_dlc_close(d, ECONNREFUSED);
1724 continue;
1725 }
1726
1727 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
1728 continue;
1729
1730 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
1731 d->mscex == RFCOMM_MSCEX_OK)
1732 rfcomm_process_tx(d);
1733 }
1734}
1735
1736static inline void rfcomm_process_rx(struct rfcomm_session *s)
1737{
1738 struct socket *sock = s->sock;
1739 struct sock *sk = sock->sk;
1740 struct sk_buff *skb;
1741
1742 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue));
1743
1744 /* Get data directly from socket receive queue without copying it. */
1745 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
1746 skb_orphan(skb);
1747 rfcomm_recv_frame(s, skb);
1748 }
1749
1750 if (sk->sk_state == BT_CLOSED) {
1751 if (!s->initiator)
1752 rfcomm_session_put(s);
1753
1754 rfcomm_session_close(s, sk->sk_err);
1755 }
1756}
1757
1758static inline void rfcomm_accept_connection(struct rfcomm_session *s)
1759{
1760 struct socket *sock = s->sock, *nsock;
1761 int err;
1762
1763 /* Fast check for a new connection.
1764 * Avoids unnesesary socket allocations. */
1765 if (list_empty(&bt_sk(sock->sk)->accept_q))
1766 return;
1767
1768 BT_DBG("session %p", s);
1769
48db9ca4
MH		 1770 err = kernel_accept(sock, &nsock, O_NONBLOCK);
1771 if (err < 0)
1da177e4
LT		 1772 return;
1773
1da177e4
LT		 1774 __module_get(nsock->ops->owner);
1775
1da177e4
LT		 1776 /* Set our callbacks */
1777 nsock->sk->sk_data_ready = rfcomm_l2data_ready;
1778 nsock->sk->sk_state_change = rfcomm_l2state_change;
1779
1780 s = rfcomm_session_add(nsock, BT_OPEN);
1781 if (s) {
1782 rfcomm_session_hold(s);
98bcd08b
MH		 1783
1784 /* We should adjust MTU on incoming sessions.
1785 * L2CAP MTU minus UIH header and FCS. */
1786 s->mtu = min(l2cap_pi(nsock->sk)->omtu, l2cap_pi(nsock->sk)->imtu) - 5;
1787
1da177e4
LT		 1788 rfcomm_schedule(RFCOMM_SCHED_RX);
1789 } else
1790 sock_release(nsock);
1791}
1792
1793static inline void rfcomm_check_connection(struct rfcomm_session *s)
1794{
1795 struct sock *sk = s->sock->sk;
1796
1797 BT_DBG("%p state %ld", s, s->state);
1798
1799 switch(sk->sk_state) {
1800 case BT_CONNECTED:
1801 s->state = BT_CONNECT;
1802
1803 /* We can adjust MTU on outgoing sessions.
1804 * L2CAP MTU minus UIH header and FCS. */
1805 s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5;
1806
1807 rfcomm_send_sabm(s, 0);
1808 break;
1809
1810 case BT_CLOSED:
1811 s->state = BT_CLOSED;
1812 rfcomm_session_close(s, sk->sk_err);
1813 break;
1814 }
1815}
1816
1817static inline void rfcomm_process_sessions(void)
1818{
1819 struct list_head *p, *n;
1820
1821 rfcomm_lock();
1822
1823 list_for_each_safe(p, n, &session_list) {
1824 struct rfcomm_session *s;
1825 s = list_entry(p, struct rfcomm_session, list);
1826
1827 if (s->state == BT_LISTEN) {
1828 rfcomm_accept_connection(s);
1829 continue;
1830 }
1831
1832 rfcomm_session_hold(s);
1833
1834 switch (s->state) {
1835 case BT_BOUND:
1836 rfcomm_check_connection(s);
1837 break;
1838
1839 default:
1840 rfcomm_process_rx(s);
1841 break;
1842 }
1843
1844 rfcomm_process_dlcs(s);
1845
1846 rfcomm_session_put(s);
1847 }
1848
1849 rfcomm_unlock();
1850}
1851
1da177e4
LT		 1852static int rfcomm_add_listener(bdaddr_t *ba)
1853{
1854 struct sockaddr_l2 addr;
1855 struct socket *sock;
1856 struct sock *sk;
1857 struct rfcomm_session *s;
1858 int err = 0;
1859
1860 /* Create socket */
1861 err = rfcomm_l2sock_create(&sock);
8e87d142 1862 if (err < 0) {
1da177e4
LT		 1863 BT_ERR("Create socket failed %d", err);
1864 return err;
1865 }
1866
1867 /* Bind socket */
1868 bacpy(&addr.l2_bdaddr, ba);
1869 addr.l2_family = AF_BLUETOOTH;
1870 addr.l2_psm = htobs(RFCOMM_PSM);
48db9ca4 1871 err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
1da177e4
LT		 1872 if (err < 0) {
1873 BT_ERR("Bind failed %d", err);
1874 goto failed;
1875 }
1876
1877 /* Set L2CAP options */
1878 sk = sock->sk;
1879 lock_sock(sk);
56f3a40a 1880 l2cap_pi(sk)->imtu = l2cap_mtu;
1da177e4
LT		 1881 release_sock(sk);
1882
1883 /* Start listening on the socket */
48db9ca4 1884 err = kernel_listen(sock, 10);
1da177e4
LT		 1885 if (err) {
1886 BT_ERR("Listen failed %d", err);
1887 goto failed;
1888 }
1889
1890 /* Add listening session */
1891 s = rfcomm_session_add(sock, BT_LISTEN);
1892 if (!s)
1893 goto failed;
1894
1895 rfcomm_session_hold(s);
1896 return 0;
1897failed:
1898 sock_release(sock);
1899 return err;
1900}
1901
1902static void rfcomm_kill_listener(void)
1903{
1904 struct rfcomm_session *s;
1905 struct list_head *p, *n;
1906
1907 BT_DBG("");
1908
1909 list_for_each_safe(p, n, &session_list) {
1910 s = list_entry(p, struct rfcomm_session, list);
1911 rfcomm_session_del(s);
1912 }
1913}
1914
1915static int rfcomm_run(void *unused)
1916{
a524eccc 1917 BT_DBG("");
1da177e4 1918
1da177e4 1919 set_user_nice(current, -10);
1da177e4 1920
1da177e4
LT		 1921 rfcomm_add_listener(BDADDR_ANY);
1922
a524eccc
MH		 1923 while (!kthread_should_stop()) {
1924 set_current_state(TASK_INTERRUPTIBLE);
1925 if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) {
1926 /* No pending events. Let's sleep.
1927 * Incoming connections and data will wake us up. */
1928 schedule();
1929 }
1930 set_current_state(TASK_RUNNING);
1931
1932 /* Process stuff */
1933 clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
1934 rfcomm_process_sessions();
1935 }
1da177e4
LT		 1936
1937 rfcomm_kill_listener();
1938
1da177e4
LT		 1939 return 0;
1940}
1941
1942static void rfcomm_auth_cfm(struct hci_conn *conn, u8 status)
1943{
1944 struct rfcomm_session *s;
1945 struct rfcomm_dlc *d;
1946 struct list_head *p, *n;
1947
1948 BT_DBG("conn %p status 0x%02x", conn, status);
1949
1950 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
1951 if (!s)
1952 return;
1953
1954 rfcomm_session_hold(s);
1955
1956 list_for_each_safe(p, n, &s->dlcs) {
1957 d = list_entry(p, struct rfcomm_dlc, list);
1958
1959 if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE))
1960 continue;
1961
1962 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
1963 continue;
1964
1965 if (!status)
1966 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
1967 else
1968 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
1969 }
1970
1971 rfcomm_session_put(s);
1972
1973 rfcomm_schedule(RFCOMM_SCHED_AUTH);
1974}
1975
1976static void rfcomm_encrypt_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
1977{
1978 struct rfcomm_session *s;
1979 struct rfcomm_dlc *d;
1980 struct list_head *p, *n;
1981
1982 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);
1983
1984 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
1985 if (!s)
1986 return;
1987
1988 rfcomm_session_hold(s);
1989
1990 list_for_each_safe(p, n, &s->dlcs) {
1991 d = list_entry(p, struct rfcomm_dlc, list);
1992
1993 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
1994 continue;
1995
1996 if (!status && encrypt)
1997 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
1998 else
1999 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
2000 }
2001
2002 rfcomm_session_put(s);
2003
2004 rfcomm_schedule(RFCOMM_SCHED_AUTH);
2005}
2006
2007static struct hci_cb rfcomm_cb = {
2008 .name = "RFCOMM",
2009 .auth_cfm = rfcomm_auth_cfm,
2010 .encrypt_cfm = rfcomm_encrypt_cfm
2011};
2012
be9d1227 2013static ssize_t rfcomm_dlc_sysfs_show(struct class *dev, char *buf)
1da177e4
LT		 2014{
2015 struct rfcomm_session *s;
2016 struct list_head *pp, *p;
be9d1227 2017 char *str = buf;
1da177e4
LT		 2018
2019 rfcomm_lock();
2020
2021 list_for_each(p, &session_list) {
2022 s = list_entry(p, struct rfcomm_session, list);
be9d1227
MH		 2023 list_for_each(pp, &s->dlcs) {
2024 struct sock *sk = s->sock->sk;
2025 struct rfcomm_dlc *d = list_entry(pp, struct rfcomm_dlc, list);
1da177e4 2026
be9d1227
MH		 2027 str += sprintf(str, "%s %s %ld %d %d %d %d\n",
2028 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
2029 d->state, d->dlci, d->mtu, d->rx_credits, d->tx_credits);
1da177e4
LT		 2030 }
2031 }
1da177e4 2032
1da177e4 2033 rfcomm_unlock();
1da177e4 2034
be9d1227 2035 return (str - buf);
1da177e4
LT		 2036}
2037
be9d1227 2038static CLASS_ATTR(rfcomm_dlc, S_IRUGO, rfcomm_dlc_sysfs_show, NULL);
1da177e4
LT		 2039
2040/* ---- Initialization ---- */
2041static int __init rfcomm_init(void)
2042{
2043 l2cap_load();
2044
2045 hci_register_cb(&rfcomm_cb);
2046
a524eccc
MH		 2047 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
2048 if (IS_ERR(rfcomm_thread)) {
2049 hci_unregister_cb(&rfcomm_cb);
2050 return PTR_ERR(rfcomm_thread);
2051 }
1da177e4 2052
df5c37ea
MH		 2053 if (class_create_file(bt_class, &class_attr_rfcomm_dlc) < 0)
2054 BT_ERR("Failed to create RFCOMM info file");
1da177e4
LT		 2055
2056 rfcomm_init_sockets();
2057
2058#ifdef CONFIG_BT_RFCOMM_TTY
2059 rfcomm_init_ttys();
2060#endif
2061
be9d1227
MH		 2062 BT_INFO("RFCOMM ver %s", VERSION);
2063
1da177e4
LT		 2064 return 0;
2065}
2066
2067static void __exit rfcomm_exit(void)
2068{
a91f2e39 2069 class_remove_file(bt_class, &class_attr_rfcomm_dlc);
be9d1227 2070
1da177e4
LT		 2071 hci_unregister_cb(&rfcomm_cb);
2072
a524eccc 2073 kthread_stop(rfcomm_thread);
1da177e4
LT		 2074
2075#ifdef CONFIG_BT_RFCOMM_TTY
2076 rfcomm_cleanup_ttys();
2077#endif
2078
2079 rfcomm_cleanup_sockets();
1da177e4
LT		 2080}
2081
2082module_init(rfcomm_init);
2083module_exit(rfcomm_exit);
2084
7c2660b0
MH		 2085module_param(disable_cfc, bool, 0644);
2086MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
2087
98bcd08b
MH		 2088module_param(channel_mtu, int, 0644);
2089MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
2090
56f3a40a
MH		 2091module_param(l2cap_mtu, uint, 0644);
2092MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");
2093
1da177e4
LT		 2094MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
2095MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
2096MODULE_VERSION(VERSION);
2097MODULE_LICENSE("GPL");
2098MODULE_ALIAS("bt-proto-3");
Linux 6.x block layer and io_uring tree(s)