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Bluetooth: Fix RFCOMM session reference counting issue
[GitHub/mt8127/android_kernel_alcatel_ttab.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.
1da177e4
LT		 26 */
27
1da177e4
LT		 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>
be9d1227 35#include <linux/device.h>
aef7d97c
MH		 36#include <linux/debugfs.h>
37#include <linux/seq_file.h>
1da177e4 38#include <linux/net.h>
4a3e2f71 39#include <linux/mutex.h>
a524eccc 40#include <linux/kthread.h>
5a0e3ad6 41#include <linux/slab.h>
4a3e2f71 42
1da177e4 43#include <net/sock.h>
285b4e90 44#include <linux/uaccess.h>
1da177e4
LT		 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
5f9018af 52#define VERSION "1.11"
56f3a40a 53
eb939922
RR		 54static bool disable_cfc;
55static bool l2cap_ertm;
98bcd08b 56static int channel_mtu = -1;
56f3a40a
MH		 57static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
58
1da177e4
LT		 59static struct task_struct *rfcomm_thread;
60
4a3e2f71
AV		 61static DEFINE_MUTEX(rfcomm_mutex);
62#define rfcomm_lock() mutex_lock(&rfcomm_mutex)
63#define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
1da177e4 64
1da177e4
LT		 65
66static LIST_HEAD(session_list);
1da177e4 67
5436538f 68static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
1da177e4
LT		 69static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
70static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
71static int rfcomm_queue_disc(struct rfcomm_dlc *d);
72static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
73static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
74static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
75static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
76static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
77static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
78
79static void rfcomm_process_connect(struct rfcomm_session *s);
80
63ce0900
LAD		 81static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
82 bdaddr_t *dst,
83 u8 sec_level,
84 int *err);
1da177e4
LT		 85static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
86static void rfcomm_session_del(struct rfcomm_session *s);
87
88/* ---- RFCOMM frame parsing macros ---- */
89#define __get_dlci(b) ((b & 0xfc) >> 2)
90#define __get_channel(b) ((b & 0xf8) >> 3)
91#define __get_dir(b) ((b & 0x04) >> 2)
92#define __get_type(b) ((b & 0xef))
93
94#define __test_ea(b) ((b & 0x01))
95#define __test_cr(b) ((b & 0x02))
96#define __test_pf(b) ((b & 0x10))
97
98#define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
99#define __ctrl(type, pf) (((type & 0xef) | (pf << 4)))
100#define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir)
101#define __srv_channel(dlci) (dlci >> 1)
102#define __dir(dlci) (dlci & 0x01)
103
104#define __len8(len) (((len) << 1) | 1)
105#define __len16(len) ((len) << 1)
106
107/* MCC macros */
108#define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01))
109#define __get_mcc_type(b) ((b & 0xfc) >> 2)
110#define __get_mcc_len(b) ((b & 0xfe) >> 1)
111
112/* RPN macros */
3a5e903c 113#define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
1da177e4
LT		 114#define __get_rpn_data_bits(line) ((line) & 0x3)
115#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
3a5e903c 116#define __get_rpn_parity(line) (((line) >> 3) & 0x7)
1da177e4 117
534c92fd 118static inline void rfcomm_schedule(void)
1da177e4
LT		 119{
120 if (!rfcomm_thread)
121 return;
1da177e4
LT		 122 wake_up_process(rfcomm_thread);
123}
124
125static inline void rfcomm_session_put(struct rfcomm_session *s)
126{
127 if (atomic_dec_and_test(&s->refcnt))
128 rfcomm_session_del(s);
129}
130
131/* ---- RFCOMM FCS computation ---- */
132
408c1ce2 133/* reversed, 8-bit, poly=0x07 */
8e87d142 134static unsigned char rfcomm_crc_table[256] = {
408c1ce2
MH		 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
1da177e4
LT		 176/* CRC on 2 bytes */
177#define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
178
8e87d142 179/* FCS on 2 bytes */
1da177e4
LT		 180static inline u8 __fcs(u8 *data)
181{
a02cec21 182 return 0xff - __crc(data);
1da177e4
LT		 183}
184
8e87d142 185/* FCS on 3 bytes */
1da177e4
LT		 186static inline u8 __fcs2(u8 *data)
187{
a02cec21 188 return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]];
1da177e4
LT		 189}
190
191/* Check FCS */
192static inline int __check_fcs(u8 *data, int type, u8 fcs)
193{
194 u8 f = __crc(data);
195
196 if (type != RFCOMM_UIH)
197 f = rfcomm_crc_table[f ^ data[2]];
198
199 return rfcomm_crc_table[f ^ fcs] != 0xcf;
200}
201
202/* ---- L2CAP callbacks ---- */
203static void rfcomm_l2state_change(struct sock *sk)
204{
205 BT_DBG("%p state %d", sk, sk->sk_state);
534c92fd 206 rfcomm_schedule();
1da177e4
LT		 207}
208
209static void rfcomm_l2data_ready(struct sock *sk, int bytes)
210{
211 BT_DBG("%p bytes %d", sk, bytes);
534c92fd 212 rfcomm_schedule();
1da177e4
LT		 213}
214
215static int rfcomm_l2sock_create(struct socket **sock)
216{
217 int err;
218
219 BT_DBG("");
220
221 err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
222 if (!err) {
223 struct sock *sk = (*sock)->sk;
224 sk->sk_data_ready = rfcomm_l2data_ready;
225 sk->sk_state_change = rfcomm_l2state_change;
226 }
227 return err;
228}
229
9f2c8a03 230static inline int rfcomm_check_security(struct rfcomm_dlc *d)
77db1980
MH		 231{
232 struct sock *sk = d->session->sock->sk;
8c1d787b
GP		 233 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
234
0684e5f9
MH		 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 }
77db1980 248
8c1d787b 249 return hci_conn_security(conn->hcon, d->sec_level, auth_type);
77db1980
MH		 250}
251
9e726b17
LAD		 252static void rfcomm_session_timeout(unsigned long arg)
253{
254 struct rfcomm_session *s = (void *) arg;
255
256 BT_DBG("session %p state %ld", s, s->state);
257
258 set_bit(RFCOMM_TIMED_OUT, &s->flags);
534c92fd 259 rfcomm_schedule();
9e726b17
LAD		 260}
261
262static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout)
263{
264 BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout);
265
266 if (!mod_timer(&s->timer, jiffies + timeout))
267 rfcomm_session_hold(s);
268}
269
270static void rfcomm_session_clear_timer(struct rfcomm_session *s)
271{
272 BT_DBG("session %p state %ld", s, s->state);
273
274 if (timer_pending(&s->timer) && del_timer(&s->timer))
275 rfcomm_session_put(s);
276}
277
1da177e4
LT		 278/* ---- RFCOMM DLCs ---- */
279static void rfcomm_dlc_timeout(unsigned long arg)
280{
281 struct rfcomm_dlc *d = (void *) arg;
282
283 BT_DBG("dlc %p state %ld", d, d->state);
284
285 set_bit(RFCOMM_TIMED_OUT, &d->flags);
286 rfcomm_dlc_put(d);
534c92fd 287 rfcomm_schedule();
1da177e4
LT		 288}
289
290static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
291{
292 BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);
293
294 if (!mod_timer(&d->timer, jiffies + timeout))
295 rfcomm_dlc_hold(d);
296}
297
298static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
299{
300 BT_DBG("dlc %p state %ld", d, d->state);
301
302 if (timer_pending(&d->timer) && del_timer(&d->timer))
303 rfcomm_dlc_put(d);
304}
305
306static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
307{
308 BT_DBG("%p", d);
309
310 d->state = BT_OPEN;
311 d->flags = 0;
312 d->mscex = 0;
183f732c 313 d->sec_level = BT_SECURITY_LOW;
1da177e4
LT		 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
dd0fc66f 321struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
1da177e4 322{
25ea6db0
MH		 323 struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);
324
1da177e4
LT		 325 if (!d)
326 return NULL;
1da177e4 327
b24b8a24 328 setup_timer(&d->timer, rfcomm_dlc_timeout, (unsigned long)d);
1da177e4
LT		 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);
8e87d142 335
1da177e4 336 BT_DBG("%p", d);
25ea6db0 337
1da177e4
LT		 338 return d;
339}
340
341void rfcomm_dlc_free(struct rfcomm_dlc *d)
342{
343 BT_DBG("%p", d);
344
345 skb_queue_purge(&d->tx_queue);
346 kfree(d);
347}
348
349static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
350{
351 BT_DBG("dlc %p session %p", d, s);
352
353 rfcomm_session_hold(s);
354
9e726b17 355 rfcomm_session_clear_timer(s);
1da177e4
LT		 356 rfcomm_dlc_hold(d);
357 list_add(&d->list, &s->dlcs);
358 d->session = s;
359}
360
361static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
362{
363 struct rfcomm_session *s = d->session;
364
365 BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s);
366
367 list_del(&d->list);
368 d->session = NULL;
369 rfcomm_dlc_put(d);
370
9e726b17
LAD		 371 if (list_empty(&s->dlcs))
372 rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT);
373
1da177e4
LT		 374 rfcomm_session_put(s);
375}
376
377static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
378{
379 struct rfcomm_dlc *d;
1da177e4 380
8035ded4 381 list_for_each_entry(d, &s->dlcs, list)
1da177e4
LT		 382 if (d->dlci == dlci)
383 return d;
8035ded4 384
1da177e4
LT		 385 return NULL;
386}
387
388static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
389{
390 struct rfcomm_session *s;
391 int err = 0;
392 u8 dlci;
393
8e87d142 394 BT_DBG("dlc %p state %ld %s %s channel %d",
1da177e4
LT		 395 d, d->state, batostr(src), batostr(dst), channel);
396
397 if (channel < 1 || channel > 30)
398 return -EINVAL;
399
400 if (d->state != BT_OPEN && d->state != BT_CLOSED)
401 return 0;
402
403 s = rfcomm_session_get(src, dst);
404 if (!s) {
63ce0900 405 s = rfcomm_session_create(src, dst, d->sec_level, &err);
1da177e4
LT		 406 if (!s)
407 return err;
408 }
409
410 dlci = __dlci(!s->initiator, channel);
411
412 /* Check if DLCI already exists */
413 if (rfcomm_dlc_get(s, dlci))
414 return -EBUSY;
415
416 rfcomm_dlc_clear_state(d);
417
418 d->dlci = dlci;
419 d->addr = __addr(s->initiator, dlci);
420 d->priority = 7;
421
77db1980 422 d->state = BT_CONFIG;
1da177e4
LT		 423 rfcomm_dlc_link(s, d);
424
77db1980
MH		 425 d->out = 1;
426
1da177e4
LT		 427 d->mtu = s->mtu;
428 d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;
429
77db1980 430 if (s->state == BT_CONNECTED) {
9f2c8a03 431 if (rfcomm_check_security(d))
77db1980 432 rfcomm_send_pn(s, 1, d);
8c1b2355
MH		 433 else
434 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
77db1980
MH		 435 }
436
1da177e4 437 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
77db1980 438
1da177e4
LT		 439 return 0;
440}
441
442int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
443{
444 int r;
445
446 rfcomm_lock();
447
448 r = __rfcomm_dlc_open(d, src, dst, channel);
449
450 rfcomm_unlock();
451 return r;
452}
453
454static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
455{
456 struct rfcomm_session *s = d->session;
457 if (!s)
458 return 0;
459
460 BT_DBG("dlc %p state %ld dlci %d err %d session %p",
461 d, d->state, d->dlci, err, s);
462
463 switch (d->state) {
1da177e4 464 case BT_CONNECT:
bb23c0ab
MH		 465 case BT_CONFIG:
466 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
467 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
534c92fd 468 rfcomm_schedule();
bb23c0ab
MH		 469 break;
470 }
471 /* Fall through */
472
473 case BT_CONNECTED:
1da177e4
LT		 474 d->state = BT_DISCONN;
475 if (skb_queue_empty(&d->tx_queue)) {
476 rfcomm_send_disc(s, d->dlci);
477 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
478 } else {
479 rfcomm_queue_disc(d);
480 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
481 }
482 break;
483
bb23c0ab 484 case BT_OPEN:
8bf47941 485 case BT_CONNECT2:
bb23c0ab
MH		 486 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
487 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
534c92fd 488 rfcomm_schedule();
bb23c0ab
MH		 489 break;
490 }
491 /* Fall through */
492
1da177e4
LT		 493 default:
494 rfcomm_dlc_clear_timer(d);
495
496 rfcomm_dlc_lock(d);
497 d->state = BT_CLOSED;
1905f6c7 498 d->state_change(d, err);
4c8411f8 499 rfcomm_dlc_unlock(d);
1da177e4
LT		 500
501 skb_queue_purge(&d->tx_queue);
1da177e4
LT		 502 rfcomm_dlc_unlink(d);
503 }
504
505 return 0;
506}
507
508int rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
509{
510 int r;
511
512 rfcomm_lock();
513
514 r = __rfcomm_dlc_close(d, err);
515
516 rfcomm_unlock();
517 return r;
518}
519
520int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
521{
522 int len = skb->len;
523
524 if (d->state != BT_CONNECTED)
525 return -ENOTCONN;
526
527 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
528
529 if (len > d->mtu)
530 return -EINVAL;
531
532 rfcomm_make_uih(skb, d->addr);
533 skb_queue_tail(&d->tx_queue, skb);
534
535 if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
534c92fd 536 rfcomm_schedule();
1da177e4
LT		 537 return len;
538}
539
b5606c2d 540void __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
1da177e4
LT		 541{
542 BT_DBG("dlc %p state %ld", d, d->state);
543
544 if (!d->cfc) {
545 d->v24_sig |= RFCOMM_V24_FC;
546 set_bit(RFCOMM_MSC_PENDING, &d->flags);
547 }
534c92fd 548 rfcomm_schedule();
1da177e4
LT		 549}
550
b5606c2d 551void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
1da177e4
LT		 552{
553 BT_DBG("dlc %p state %ld", d, d->state);
554
555 if (!d->cfc) {
556 d->v24_sig &= ~RFCOMM_V24_FC;
557 set_bit(RFCOMM_MSC_PENDING, &d->flags);
558 }
534c92fd 559 rfcomm_schedule();
1da177e4
LT		 560}
561
8e87d142 562/*
1da177e4
LT		 563 Set/get modem status functions use _local_ status i.e. what we report
564 to the other side.
565 Remote status is provided by dlc->modem_status() callback.
566 */
567int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig)
568{
8e87d142 569 BT_DBG("dlc %p state %ld v24_sig 0x%x",
1da177e4
LT		 570 d, d->state, v24_sig);
571
572 if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
573 v24_sig |= RFCOMM_V24_FC;
574 else
575 v24_sig &= ~RFCOMM_V24_FC;
8e87d142 576
1da177e4
LT		 577 d->v24_sig = v24_sig;
578
579 if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags))
534c92fd 580 rfcomm_schedule();
1da177e4
LT		 581
582 return 0;
583}
584
585int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig)
586{
8e87d142 587 BT_DBG("dlc %p state %ld v24_sig 0x%x",
1da177e4
LT		 588 d, d->state, d->v24_sig);
589
590 *v24_sig = d->v24_sig;
591 return 0;
592}
593
594/* ---- RFCOMM sessions ---- */
595static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
596{
25ea6db0
MH		 597 struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL);
598
1da177e4
LT		 599 if (!s)
600 return NULL;
1da177e4
LT		 601
602 BT_DBG("session %p sock %p", s, sock);
603
9e726b17
LAD		 604 setup_timer(&s->timer, rfcomm_session_timeout, (unsigned long) s);
605
1da177e4
LT		 606 INIT_LIST_HEAD(&s->dlcs);
607 s->state = state;
608 s->sock = sock;
609
610 s->mtu = RFCOMM_DEFAULT_MTU;
7c2660b0 611 s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;
1da177e4
LT		 612
613 /* Do not increment module usage count for listening sessions.
614 * Otherwise we won't be able to unload the module. */
615 if (state != BT_LISTEN)
616 if (!try_module_get(THIS_MODULE)) {
617 kfree(s);
618 return NULL;
619 }
620
621 list_add(&s->list, &session_list);
622
623 return s;
624}
625
626static void rfcomm_session_del(struct rfcomm_session *s)
627{
628 int state = s->state;
629
630 BT_DBG("session %p state %ld", s, s->state);
631
632 list_del(&s->list);
633
634 if (state == BT_CONNECTED)
635 rfcomm_send_disc(s, 0);
636
9e726b17 637 rfcomm_session_clear_timer(s);
1da177e4
LT		 638 sock_release(s->sock);
639 kfree(s);
640
641 if (state != BT_LISTEN)
642 module_put(THIS_MODULE);
643}
644
645static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst)
646{
647 struct rfcomm_session *s;
648 struct list_head *p, *n;
649 struct bt_sock *sk;
650 list_for_each_safe(p, n, &session_list) {
651 s = list_entry(p, struct rfcomm_session, list);
8e87d142 652 sk = bt_sk(s->sock->sk);
1da177e4
LT		 653
654 if ((!bacmp(src, BDADDR_ANY) || !bacmp(&sk->src, src)) &&
655 !bacmp(&sk->dst, dst))
656 return s;
657 }
658 return NULL;
659}
660
661static void rfcomm_session_close(struct rfcomm_session *s, int err)
662{
663 struct rfcomm_dlc *d;
664 struct list_head *p, *n;
665
666 BT_DBG("session %p state %ld err %d", s, s->state, err);
667
668 rfcomm_session_hold(s);
669
670 s->state = BT_CLOSED;
671
672 /* Close all dlcs */
673 list_for_each_safe(p, n, &s->dlcs) {
674 d = list_entry(p, struct rfcomm_dlc, list);
675 d->state = BT_CLOSED;
676 __rfcomm_dlc_close(d, err);
677 }
678
9e726b17 679 rfcomm_session_clear_timer(s);
1da177e4
LT		 680 rfcomm_session_put(s);
681}
682
63ce0900
LAD		 683static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
684 bdaddr_t *dst,
685 u8 sec_level,
686 int *err)
1da177e4
LT		 687{
688 struct rfcomm_session *s = NULL;
689 struct sockaddr_l2 addr;
690 struct socket *sock;
691 struct sock *sk;
692
693 BT_DBG("%s %s", batostr(src), batostr(dst));
694
695 *err = rfcomm_l2sock_create(&sock);
696 if (*err < 0)
697 return NULL;
698
699 bacpy(&addr.l2_bdaddr, src);
700 addr.l2_family = AF_BLUETOOTH;
701 addr.l2_psm = 0;
37e62f55 702 addr.l2_cid = 0;
48db9ca4 703 *err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
1da177e4
LT		 704 if (*err < 0)
705 goto failed;
706
707 /* Set L2CAP options */
708 sk = sock->sk;
709 lock_sock(sk);
0c1bc5c6 710 l2cap_pi(sk)->chan->imtu = l2cap_mtu;
47d1ec61 711 l2cap_pi(sk)->chan->sec_level = sec_level;
eae38eed 712 if (l2cap_ertm)
0c1bc5c6 713 l2cap_pi(sk)->chan->mode = L2CAP_MODE_ERTM;
1da177e4
LT		 714 release_sock(sk);
715
716 s = rfcomm_session_add(sock, BT_BOUND);
717 if (!s) {
718 *err = -ENOMEM;
719 goto failed;
720 }
721
1da177e4
LT		 722 s->initiator = 1;
723
724 bacpy(&addr.l2_bdaddr, dst);
725 addr.l2_family = AF_BLUETOOTH;
b4324b5d 726 addr.l2_psm = cpu_to_le16(RFCOMM_PSM);
37e62f55 727 addr.l2_cid = 0;
48db9ca4 728 *err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
b4c612a4 729 if (*err == 0 || *err == -EINPROGRESS)
1da177e4
LT		 730 return s;
731
732 rfcomm_session_del(s);
733 return NULL;
734
735failed:
736 sock_release(sock);
737 return NULL;
738}
739
740void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst)
741{
742 struct sock *sk = s->sock->sk;
743 if (src)
744 bacpy(src, &bt_sk(sk)->src);
745 if (dst)
746 bacpy(dst, &bt_sk(sk)->dst);
747}
748
749/* ---- RFCOMM frame sending ---- */
5436538f 750static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len)
1da177e4 751{
1da177e4
LT		 752 struct kvec iv = { data, len };
753 struct msghdr msg;
754
5436538f 755 BT_DBG("session %p len %d", s, len);
1da177e4
LT		 756
757 memset(&msg, 0, sizeof(msg));
758
5436538f 759 return kernel_sendmsg(s->sock, &msg, &iv, 1, len);
1da177e4
LT		 760}
761
262038fc
LAD		 762static int rfcomm_send_cmd(struct rfcomm_session *s, struct rfcomm_cmd *cmd)
763{
764 BT_DBG("%p cmd %u", s, cmd->ctrl);
765
5436538f 766 return rfcomm_send_frame(s, (void *) cmd, sizeof(*cmd));
262038fc
LAD		 767}
768
1da177e4
LT		 769static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci)
770{
771 struct rfcomm_cmd cmd;
772
773 BT_DBG("%p dlci %d", s, dlci);
774
775 cmd.addr = __addr(s->initiator, dlci);
776 cmd.ctrl = __ctrl(RFCOMM_SABM, 1);
777 cmd.len = __len8(0);
778 cmd.fcs = __fcs2((u8 *) &cmd);
779
262038fc 780 return rfcomm_send_cmd(s, &cmd);
1da177e4
LT		 781}
782
783static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci)
784{
785 struct rfcomm_cmd cmd;
786
787 BT_DBG("%p dlci %d", s, dlci);
788
789 cmd.addr = __addr(!s->initiator, dlci);
790 cmd.ctrl = __ctrl(RFCOMM_UA, 1);
791 cmd.len = __len8(0);
792 cmd.fcs = __fcs2((u8 *) &cmd);
793
262038fc 794 return rfcomm_send_cmd(s, &cmd);
1da177e4
LT		 795}
796
797static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci)
798{
799 struct rfcomm_cmd cmd;
800
801 BT_DBG("%p dlci %d", s, dlci);
802
803 cmd.addr = __addr(s->initiator, dlci);
804 cmd.ctrl = __ctrl(RFCOMM_DISC, 1);
805 cmd.len = __len8(0);
806 cmd.fcs = __fcs2((u8 *) &cmd);
807
262038fc 808 return rfcomm_send_cmd(s, &cmd);
1da177e4
LT		 809}
810
811static int rfcomm_queue_disc(struct rfcomm_dlc *d)
812{
813 struct rfcomm_cmd *cmd;
814 struct sk_buff *skb;
815
816 BT_DBG("dlc %p dlci %d", d, d->dlci);
817
818 skb = alloc_skb(sizeof(*cmd), GFP_KERNEL);
819 if (!skb)
820 return -ENOMEM;
821
822 cmd = (void *) __skb_put(skb, sizeof(*cmd));
823 cmd->addr = d->addr;
824 cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
825 cmd->len = __len8(0);
826 cmd->fcs = __fcs2((u8 *) cmd);
827
828 skb_queue_tail(&d->tx_queue, skb);
534c92fd 829 rfcomm_schedule();
1da177e4
LT		 830 return 0;
831}
832
833static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci)
834{
835 struct rfcomm_cmd cmd;
836
837 BT_DBG("%p dlci %d", s, dlci);
838
839 cmd.addr = __addr(!s->initiator, dlci);
840 cmd.ctrl = __ctrl(RFCOMM_DM, 1);
841 cmd.len = __len8(0);
842 cmd.fcs = __fcs2((u8 *) &cmd);
843
262038fc 844 return rfcomm_send_cmd(s, &cmd);
1da177e4
LT		 845}
846
847static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type)
848{
849 struct rfcomm_hdr *hdr;
850 struct rfcomm_mcc *mcc;
851 u8 buf[16], *ptr = buf;
852
853 BT_DBG("%p cr %d type %d", s, cr, type);
854
855 hdr = (void *) ptr; ptr += sizeof(*hdr);
856 hdr->addr = __addr(s->initiator, 0);
857 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
858 hdr->len = __len8(sizeof(*mcc) + 1);
859
860 mcc = (void *) ptr; ptr += sizeof(*mcc);
861 mcc->type = __mcc_type(cr, RFCOMM_NSC);
862 mcc->len = __len8(1);
863
864 /* Type that we didn't like */
865 *ptr = __mcc_type(cr, type); ptr++;
866
867 *ptr = __fcs(buf); ptr++;
868
5436538f 869 return rfcomm_send_frame(s, buf, ptr - buf);
1da177e4
LT		 870}
871
872static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d)
873{
874 struct rfcomm_hdr *hdr;
875 struct rfcomm_mcc *mcc;
876 struct rfcomm_pn *pn;
877 u8 buf[16], *ptr = buf;
878
879 BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu);
880
881 hdr = (void *) ptr; ptr += sizeof(*hdr);
882 hdr->addr = __addr(s->initiator, 0);
883 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
884 hdr->len = __len8(sizeof(*mcc) + sizeof(*pn));
885
886 mcc = (void *) ptr; ptr += sizeof(*mcc);
887 mcc->type = __mcc_type(cr, RFCOMM_PN);
888 mcc->len = __len8(sizeof(*pn));
889
890 pn = (void *) ptr; ptr += sizeof(*pn);
891 pn->dlci = d->dlci;
892 pn->priority = d->priority;
893 pn->ack_timer = 0;
894 pn->max_retrans = 0;
895
896 if (s->cfc) {
897 pn->flow_ctrl = cr ? 0xf0 : 0xe0;
898 pn->credits = RFCOMM_DEFAULT_CREDITS;
899 } else {
900 pn->flow_ctrl = 0;
901 pn->credits = 0;
902 }
903
98bcd08b 904 if (cr && channel_mtu >= 0)
b4324b5d 905 pn->mtu = cpu_to_le16(channel_mtu);
98bcd08b 906 else
b4324b5d 907 pn->mtu = cpu_to_le16(d->mtu);
1da177e4
LT		 908
909 *ptr = __fcs(buf); ptr++;
910
5436538f 911 return rfcomm_send_frame(s, buf, ptr - buf);
1da177e4
LT		 912}
913
3a5e903c
S		 914int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
915 u8 bit_rate, u8 data_bits, u8 stop_bits,
8e87d142 916 u8 parity, u8 flow_ctrl_settings,
3a5e903c 917 u8 xon_char, u8 xoff_char, u16 param_mask)
1da177e4
LT		 918{
919 struct rfcomm_hdr *hdr;
920 struct rfcomm_mcc *mcc;
921 struct rfcomm_rpn *rpn;
922 u8 buf[16], *ptr = buf;
923
924 BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x"
8e87d142
YH		 925 " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x",
926 s, cr, dlci, bit_rate, data_bits, stop_bits, parity,
3a5e903c 927 flow_ctrl_settings, xon_char, xoff_char, param_mask);
1da177e4
LT		 928
929 hdr = (void *) ptr; ptr += sizeof(*hdr);
930 hdr->addr = __addr(s->initiator, 0);
931 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
932 hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn));
933
934 mcc = (void *) ptr; ptr += sizeof(*mcc);
935 mcc->type = __mcc_type(cr, RFCOMM_RPN);
936 mcc->len = __len8(sizeof(*rpn));
937
938 rpn = (void *) ptr; ptr += sizeof(*rpn);
939 rpn->dlci = __addr(1, dlci);
940 rpn->bit_rate = bit_rate;
941 rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity);
942 rpn->flow_ctrl = flow_ctrl_settings;
943 rpn->xon_char = xon_char;
944 rpn->xoff_char = xoff_char;
e8db8c99 945 rpn->param_mask = cpu_to_le16(param_mask);
1da177e4
LT		 946
947 *ptr = __fcs(buf); ptr++;
948
5436538f 949 return rfcomm_send_frame(s, buf, ptr - buf);
1da177e4
LT		 950}
951
952static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status)
953{
954 struct rfcomm_hdr *hdr;
955 struct rfcomm_mcc *mcc;
956 struct rfcomm_rls *rls;
957 u8 buf[16], *ptr = buf;
958
959 BT_DBG("%p cr %d status 0x%x", s, cr, status);
960
961 hdr = (void *) ptr; ptr += sizeof(*hdr);
962 hdr->addr = __addr(s->initiator, 0);
963 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
964 hdr->len = __len8(sizeof(*mcc) + sizeof(*rls));
965
966 mcc = (void *) ptr; ptr += sizeof(*mcc);
967 mcc->type = __mcc_type(cr, RFCOMM_RLS);
968 mcc->len = __len8(sizeof(*rls));
969
970 rls = (void *) ptr; ptr += sizeof(*rls);
971 rls->dlci = __addr(1, dlci);
972 rls->status = status;
973
974 *ptr = __fcs(buf); ptr++;
975
5436538f 976 return rfcomm_send_frame(s, buf, ptr - buf);
1da177e4
LT		 977}
978
979static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig)
980{
981 struct rfcomm_hdr *hdr;
982 struct rfcomm_mcc *mcc;
983 struct rfcomm_msc *msc;
984 u8 buf[16], *ptr = buf;
985
986 BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig);
987
988 hdr = (void *) ptr; ptr += sizeof(*hdr);
989 hdr->addr = __addr(s->initiator, 0);
990 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
991 hdr->len = __len8(sizeof(*mcc) + sizeof(*msc));
992
993 mcc = (void *) ptr; ptr += sizeof(*mcc);
994 mcc->type = __mcc_type(cr, RFCOMM_MSC);
995 mcc->len = __len8(sizeof(*msc));
996
997 msc = (void *) ptr; ptr += sizeof(*msc);
998 msc->dlci = __addr(1, dlci);
999 msc->v24_sig = v24_sig | 0x01;
1000
1001 *ptr = __fcs(buf); ptr++;
1002
5436538f 1003 return rfcomm_send_frame(s, buf, ptr - buf);
1da177e4
LT		 1004}
1005
1006static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr)
1007{
1008 struct rfcomm_hdr *hdr;
1009 struct rfcomm_mcc *mcc;
1010 u8 buf[16], *ptr = buf;
1011
1012 BT_DBG("%p cr %d", s, cr);
1013
1014 hdr = (void *) ptr; ptr += sizeof(*hdr);
1015 hdr->addr = __addr(s->initiator, 0);
1016 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1017 hdr->len = __len8(sizeof(*mcc));
1018
1019 mcc = (void *) ptr; ptr += sizeof(*mcc);
1020 mcc->type = __mcc_type(cr, RFCOMM_FCOFF);
1021 mcc->len = __len8(0);
1022
1023 *ptr = __fcs(buf); ptr++;
1024
5436538f 1025 return rfcomm_send_frame(s, buf, ptr - buf);
1da177e4
LT		 1026}
1027
1028static int rfcomm_send_fcon(struct rfcomm_session *s, int cr)
1029{
1030 struct rfcomm_hdr *hdr;
1031 struct rfcomm_mcc *mcc;
1032 u8 buf[16], *ptr = buf;
1033
1034 BT_DBG("%p cr %d", s, cr);
1035
1036 hdr = (void *) ptr; ptr += sizeof(*hdr);
1037 hdr->addr = __addr(s->initiator, 0);
1038 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1039 hdr->len = __len8(sizeof(*mcc));
1040
1041 mcc = (void *) ptr; ptr += sizeof(*mcc);
1042 mcc->type = __mcc_type(cr, RFCOMM_FCON);
1043 mcc->len = __len8(0);
1044
1045 *ptr = __fcs(buf); ptr++;
1046
5436538f 1047 return rfcomm_send_frame(s, buf, ptr - buf);
1da177e4
LT		 1048}
1049
1050static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len)
1051{
1052 struct socket *sock = s->sock;
1053 struct kvec iv[3];
1054 struct msghdr msg;
1055 unsigned char hdr[5], crc[1];
1056
1057 if (len > 125)
1058 return -EINVAL;
1059
1060 BT_DBG("%p cr %d", s, cr);
1061
1062 hdr[0] = __addr(s->initiator, 0);
1063 hdr[1] = __ctrl(RFCOMM_UIH, 0);
1064 hdr[2] = 0x01 | ((len + 2) << 1);
1065 hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2);
1066 hdr[4] = 0x01 | (len << 1);
1067
1068 crc[0] = __fcs(hdr);
1069
1070 iv[0].iov_base = hdr;
1071 iv[0].iov_len = 5;
1072 iv[1].iov_base = pattern;
1073 iv[1].iov_len = len;
1074 iv[2].iov_base = crc;
1075 iv[2].iov_len = 1;
1076
1077 memset(&msg, 0, sizeof(msg));
1078
1079 return kernel_sendmsg(sock, &msg, iv, 3, 6 + len);
1080}
1081
1082static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits)
1083{
1084 struct rfcomm_hdr *hdr;
1085 u8 buf[16], *ptr = buf;
1086
1087 BT_DBG("%p addr %d credits %d", s, addr, credits);
1088
1089 hdr = (void *) ptr; ptr += sizeof(*hdr);
1090 hdr->addr = addr;
1091 hdr->ctrl = __ctrl(RFCOMM_UIH, 1);
1092 hdr->len = __len8(0);
1093
1094 *ptr = credits; ptr++;
1095
1096 *ptr = __fcs(buf); ptr++;
1097
5436538f 1098 return rfcomm_send_frame(s, buf, ptr - buf);
1da177e4
LT		 1099}
1100
1101static void rfcomm_make_uih(struct sk_buff *skb, u8 addr)
1102{
1103 struct rfcomm_hdr *hdr;
1104 int len = skb->len;
1105 u8 *crc;
1106
1107 if (len > 127) {
1108 hdr = (void *) skb_push(skb, 4);
b4324b5d 1109 put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len);
1da177e4
LT		 1110 } else {
1111 hdr = (void *) skb_push(skb, 3);
1112 hdr->len = __len8(len);
1113 }
1114 hdr->addr = addr;
1115 hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
1116
1117 crc = skb_put(skb, 1);
1118 *crc = __fcs((void *) hdr);
1119}
1120
1121/* ---- RFCOMM frame reception ---- */
1122static int rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci)
1123{
1124 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1125
1126 if (dlci) {
1127 /* Data channel */
1128 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1129 if (!d) {
1130 rfcomm_send_dm(s, dlci);
1131 return 0;
1132 }
1133
1134 switch (d->state) {
1135 case BT_CONNECT:
1136 rfcomm_dlc_clear_timer(d);
1137
1138 rfcomm_dlc_lock(d);
1139 d->state = BT_CONNECTED;
1140 d->state_change(d, 0);
1141 rfcomm_dlc_unlock(d);
1142
1143 rfcomm_send_msc(s, 1, dlci, d->v24_sig);
1144 break;
1145
1146 case BT_DISCONN:
1147 d->state = BT_CLOSED;
1148 __rfcomm_dlc_close(d, 0);
9cf5b0ea
MH		 1149
1150 if (list_empty(&s->dlcs)) {
1151 s->state = BT_DISCONN;
1152 rfcomm_send_disc(s, 0);
79e65478 1153 rfcomm_session_clear_timer(s);
9cf5b0ea
MH		 1154 }
1155
1da177e4
LT		 1156 break;
1157 }
1158 } else {
1159 /* Control channel */
1160 switch (s->state) {
1161 case BT_CONNECT:
1162 s->state = BT_CONNECTED;
1163 rfcomm_process_connect(s);
1164 break;
9cf5b0ea
MH		 1165
1166 case BT_DISCONN:
cf33e77b
OP		 1167 /* rfcomm_session_put is called later so don't do
1168 * anything here otherwise we will mess up the session
1169 * reference counter:
1170 *
1171 * (a) when we are the initiator dlc_unlink will drive
1172 * the reference counter to 0 (there is no initial put
1173 * after session_add)
1174 *
1175 * (b) when we are not the initiator rfcomm_rx_process
1176 * will explicitly call put to balance the initial hold
1177 * done after session add.
1178 */
9cf5b0ea 1179 break;
1da177e4
LT		 1180 }
1181 }
1182 return 0;
1183}
1184
1185static int rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci)
1186{
1187 int err = 0;
1188
1189 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1190
1191 if (dlci) {
1192 /* Data DLC */
1193 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1194 if (d) {
1195 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1196 err = ECONNREFUSED;
1197 else
1198 err = ECONNRESET;
1199
1200 d->state = BT_CLOSED;
1201 __rfcomm_dlc_close(d, err);
1202 }
1203 } else {
1204 if (s->state == BT_CONNECT)
1205 err = ECONNREFUSED;
1206 else
1207 err = ECONNRESET;
1208
1209 s->state = BT_CLOSED;
1210 rfcomm_session_close(s, err);
1211 }
1212 return 0;
1213}
1214
1215static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci)
1216{
1217 int err = 0;
1218
1219 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1220
1221 if (dlci) {
1222 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
1223 if (d) {
1224 rfcomm_send_ua(s, dlci);
1225
1226 if (d->state == BT_CONNECT || d->state == BT_CONFIG)
1227 err = ECONNREFUSED;
1228 else
1229 err = ECONNRESET;
1230
1231 d->state = BT_CLOSED;
1232 __rfcomm_dlc_close(d, err);
8e87d142 1233 } else
1da177e4 1234 rfcomm_send_dm(s, dlci);
8e87d142 1235
1da177e4
LT		 1236 } else {
1237 rfcomm_send_ua(s, 0);
1238
1239 if (s->state == BT_CONNECT)
1240 err = ECONNREFUSED;
1241 else
1242 err = ECONNRESET;
1243
1244 s->state = BT_CLOSED;
1245 rfcomm_session_close(s, err);
1246 }
1247
1248 return 0;
1249}
1250
bb23c0ab 1251void rfcomm_dlc_accept(struct rfcomm_dlc *d)
1da177e4 1252{
300b9397 1253 struct sock *sk = d->session->sock->sk;
8c1d787b 1254 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
300b9397 1255
1da177e4
LT		 1256 BT_DBG("dlc %p", d);
1257
1258 rfcomm_send_ua(d->session, d->dlci);
1259
e2139b32
JH		 1260 rfcomm_dlc_clear_timer(d);
1261
1da177e4
LT		 1262 rfcomm_dlc_lock(d);
1263 d->state = BT_CONNECTED;
1264 d->state_change(d, 0);
1265 rfcomm_dlc_unlock(d);
1266
9f2c8a03 1267 if (d->role_switch)
8c1d787b 1268 hci_conn_switch_role(conn->hcon, 0x00);
300b9397 1269
1da177e4
LT		 1270 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1271}
1272
bb23c0ab
MH		 1273static void rfcomm_check_accept(struct rfcomm_dlc *d)
1274{
9f2c8a03 1275 if (rfcomm_check_security(d)) {
bb23c0ab
MH		 1276 if (d->defer_setup) {
1277 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1278 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
8bf47941
MH		 1279
1280 rfcomm_dlc_lock(d);
1281 d->state = BT_CONNECT2;
1282 d->state_change(d, 0);
1283 rfcomm_dlc_unlock(d);
bb23c0ab
MH		 1284 } else
1285 rfcomm_dlc_accept(d);
8c1b2355
MH		 1286 } else {
1287 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1288 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
bb23c0ab
MH		 1289 }
1290}
1291
1da177e4
LT		 1292static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
1293{
1294 struct rfcomm_dlc *d;
1295 u8 channel;
1296
1297 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1298
1299 if (!dlci) {
1300 rfcomm_send_ua(s, 0);
1301
1302 if (s->state == BT_OPEN) {
1303 s->state = BT_CONNECTED;
1304 rfcomm_process_connect(s);
1305 }
1306 return 0;
1307 }
1308
1309 /* Check if DLC exists */
1310 d = rfcomm_dlc_get(s, dlci);
1311 if (d) {
1312 if (d->state == BT_OPEN) {
1313 /* DLC was previously opened by PN request */
bb23c0ab 1314 rfcomm_check_accept(d);
1da177e4
LT		 1315 }
1316 return 0;
1317 }
1318
1319 /* Notify socket layer about incoming connection */
1320 channel = __srv_channel(dlci);
1321 if (rfcomm_connect_ind(s, channel, &d)) {
1322 d->dlci = dlci;
1323 d->addr = __addr(s->initiator, dlci);
1324 rfcomm_dlc_link(s, d);
1325
bb23c0ab 1326 rfcomm_check_accept(d);
1da177e4
LT		 1327 } else {
1328 rfcomm_send_dm(s, dlci);
1329 }
1330
1331 return 0;
1332}
1333
1334static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
1335{
1336 struct rfcomm_session *s = d->session;
1337
8e87d142 1338 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
1da177e4
LT		 1339 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);
1340
7c2660b0
MH		 1341 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
1342 pn->flow_ctrl == 0xe0) {
1343 d->cfc = RFCOMM_CFC_ENABLED;
1da177e4
LT		 1344 d->tx_credits = pn->credits;
1345 } else {
7c2660b0 1346 d->cfc = RFCOMM_CFC_DISABLED;
1da177e4
LT		 1347 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1348 }
1349
7c2660b0
MH		 1350 if (s->cfc == RFCOMM_CFC_UNKNOWN)
1351 s->cfc = d->cfc;
1352
1da177e4
LT		 1353 d->priority = pn->priority;
1354
b4324b5d 1355 d->mtu = __le16_to_cpu(pn->mtu);
98bcd08b
MH		 1356
1357 if (cr && d->mtu > s->mtu)
1358 d->mtu = s->mtu;
1da177e4
LT		 1359
1360 return 0;
1361}
1362
1363static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1364{
1365 struct rfcomm_pn *pn = (void *) skb->data;
1366 struct rfcomm_dlc *d;
1367 u8 dlci = pn->dlci;
1368
1369 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
1370
1371 if (!dlci)
1372 return 0;
1373
1374 d = rfcomm_dlc_get(s, dlci);
1375 if (d) {
1376 if (cr) {
1377 /* PN request */
1378 rfcomm_apply_pn(d, cr, pn);
1379 rfcomm_send_pn(s, 0, d);
1380 } else {
1381 /* PN response */
1382 switch (d->state) {
1383 case BT_CONFIG:
1384 rfcomm_apply_pn(d, cr, pn);
1385
1386 d->state = BT_CONNECT;
1387 rfcomm_send_sabm(s, d->dlci);
1388 break;
1389 }
1390 }
1391 } else {
1392 u8 channel = __srv_channel(dlci);
1393
1394 if (!cr)
1395 return 0;
1396
1397 /* PN request for non existing DLC.
1398 * Assume incoming connection. */
1399 if (rfcomm_connect_ind(s, channel, &d)) {
1400 d->dlci = dlci;
1401 d->addr = __addr(s->initiator, dlci);
1402 rfcomm_dlc_link(s, d);
1403
1404 rfcomm_apply_pn(d, cr, pn);
1405
1406 d->state = BT_OPEN;
1407 rfcomm_send_pn(s, 0, d);
1408 } else {
1409 rfcomm_send_dm(s, dlci);
1410 }
1411 }
1412 return 0;
1413}
1414
1415static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb)
1416{
1417 struct rfcomm_rpn *rpn = (void *) skb->data;
1418 u8 dlci = __get_dlci(rpn->dlci);
1419
1420 u8 bit_rate = 0;
1421 u8 data_bits = 0;
1422 u8 stop_bits = 0;
1423 u8 parity = 0;
1424 u8 flow_ctrl = 0;
1425 u8 xon_char = 0;
1426 u8 xoff_char = 0;
1427 u16 rpn_mask = RFCOMM_RPN_PM_ALL;
3a5e903c
S		 1428
1429 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",
1430 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl,
1431 rpn->xon_char, rpn->xoff_char, rpn->param_mask);
1432
1433 if (!cr)
1da177e4 1434 return 0;
3a5e903c 1435
1da177e4 1436 if (len == 1) {
08601469
YK		 1437 /* This is a request, return default (according to ETSI TS 07.10) settings */
1438 bit_rate = RFCOMM_RPN_BR_9600;
1da177e4
LT		 1439 data_bits = RFCOMM_RPN_DATA_8;
1440 stop_bits = RFCOMM_RPN_STOP_1;
1441 parity = RFCOMM_RPN_PARITY_NONE;
1442 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1443 xon_char = RFCOMM_RPN_XON_CHAR;
1444 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1da177e4
LT		 1445 goto rpn_out;
1446 }
3a5e903c
S		 1447
1448 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
1449 * no parity, no flow control lines, normal XON/XOFF chars */
1450
e8db8c99 1451 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
1da177e4 1452 bit_rate = rpn->bit_rate;
08601469 1453 if (bit_rate > RFCOMM_RPN_BR_230400) {
1da177e4 1454 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
08601469 1455 bit_rate = RFCOMM_RPN_BR_9600;
1da177e4
LT		 1456 rpn_mask ^= RFCOMM_RPN_PM_BITRATE;
1457 }
1458 }
3a5e903c 1459
e8db8c99 1460 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
1da177e4
LT		 1461 data_bits = __get_rpn_data_bits(rpn->line_settings);
1462 if (data_bits != RFCOMM_RPN_DATA_8) {
1463 BT_DBG("RPN data bits mismatch 0x%x", data_bits);
1464 data_bits = RFCOMM_RPN_DATA_8;
1465 rpn_mask ^= RFCOMM_RPN_PM_DATA;
1466 }
1467 }
3a5e903c 1468
e8db8c99 1469 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
1da177e4
LT		 1470 stop_bits = __get_rpn_stop_bits(rpn->line_settings);
1471 if (stop_bits != RFCOMM_RPN_STOP_1) {
1472 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits);
1473 stop_bits = RFCOMM_RPN_STOP_1;
1474 rpn_mask ^= RFCOMM_RPN_PM_STOP;
1475 }
1476 }
3a5e903c 1477
e8db8c99 1478 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
1da177e4
LT		 1479 parity = __get_rpn_parity(rpn->line_settings);
1480 if (parity != RFCOMM_RPN_PARITY_NONE) {
1481 BT_DBG("RPN parity mismatch 0x%x", parity);
1482 parity = RFCOMM_RPN_PARITY_NONE;
1483 rpn_mask ^= RFCOMM_RPN_PM_PARITY;
1484 }
1485 }
3a5e903c 1486
e8db8c99 1487 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
1da177e4
LT		 1488 flow_ctrl = rpn->flow_ctrl;
1489 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
1490 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl);
1491 flow_ctrl = RFCOMM_RPN_FLOW_NONE;
1492 rpn_mask ^= RFCOMM_RPN_PM_FLOW;
1493 }
1494 }
3a5e903c 1495
e8db8c99 1496 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
1da177e4
LT		 1497 xon_char = rpn->xon_char;
1498 if (xon_char != RFCOMM_RPN_XON_CHAR) {
1499 BT_DBG("RPN XON char mismatch 0x%x", xon_char);
1500 xon_char = RFCOMM_RPN_XON_CHAR;
1501 rpn_mask ^= RFCOMM_RPN_PM_XON;
1502 }
1503 }
3a5e903c 1504
e8db8c99 1505 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
1da177e4
LT		 1506 xoff_char = rpn->xoff_char;
1507 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
1508 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char);
1509 xoff_char = RFCOMM_RPN_XOFF_CHAR;
1510 rpn_mask ^= RFCOMM_RPN_PM_XOFF;
1511 }
1512 }
1513
1514rpn_out:
3a5e903c
S		 1515 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
1516 parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
1da177e4
LT		 1517
1518 return 0;
1519}
1520
1521static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1522{
1523 struct rfcomm_rls *rls = (void *) skb->data;
1524 u8 dlci = __get_dlci(rls->dlci);
1525
1526 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status);
3a5e903c 1527
1da177e4
LT		 1528 if (!cr)
1529 return 0;
1530
3a5e903c
S		 1531 /* We should probably do something with this information here. But
1532 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's
1533 * mandatory to recognise and respond to RLS */
1da177e4
LT		 1534
1535 rfcomm_send_rls(s, 0, dlci, rls->status);
1536
1537 return 0;
1538}
1539
1540static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb)
1541{
1542 struct rfcomm_msc *msc = (void *) skb->data;
1543 struct rfcomm_dlc *d;
1544 u8 dlci = __get_dlci(msc->dlci);
1545
1546 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig);
1547
1548 d = rfcomm_dlc_get(s, dlci);
3a5e903c 1549 if (!d)
1da177e4
LT		 1550 return 0;
1551
1552 if (cr) {
1553 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
1554 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1555 else
1556 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
3a5e903c 1557
1da177e4 1558 rfcomm_dlc_lock(d);
8b6b3da7
MH		 1559
1560 d->remote_v24_sig = msc->v24_sig;
1561
1da177e4
LT		 1562 if (d->modem_status)
1563 d->modem_status(d, msc->v24_sig);
8b6b3da7 1564
1da177e4 1565 rfcomm_dlc_unlock(d);
8e87d142 1566
1da177e4
LT		 1567 rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
1568
1569 d->mscex |= RFCOMM_MSCEX_RX;
3a5e903c 1570 } else
1da177e4
LT		 1571 d->mscex |= RFCOMM_MSCEX_TX;
1572
1573 return 0;
1574}
1575
1576static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb)
1577{
1578 struct rfcomm_mcc *mcc = (void *) skb->data;
1579 u8 type, cr, len;
1580
1581 cr = __test_cr(mcc->type);
1582 type = __get_mcc_type(mcc->type);
1583 len = __get_mcc_len(mcc->len);
1584
1585 BT_DBG("%p type 0x%x cr %d", s, type, cr);
1586
1587 skb_pull(skb, 2);
1588
1589 switch (type) {
1590 case RFCOMM_PN:
1591 rfcomm_recv_pn(s, cr, skb);
1592 break;
1593
1594 case RFCOMM_RPN:
1595 rfcomm_recv_rpn(s, cr, len, skb);
1596 break;
1597
1598 case RFCOMM_RLS:
1599 rfcomm_recv_rls(s, cr, skb);
1600 break;
1601
1602 case RFCOMM_MSC:
1603 rfcomm_recv_msc(s, cr, skb);
1604 break;
1605
1606 case RFCOMM_FCOFF:
1607 if (cr) {
1608 set_bit(RFCOMM_TX_THROTTLED, &s->flags);
1609 rfcomm_send_fcoff(s, 0);
1610 }
1611 break;
1612
1613 case RFCOMM_FCON:
1614 if (cr) {
1615 clear_bit(RFCOMM_TX_THROTTLED, &s->flags);
1616 rfcomm_send_fcon(s, 0);
1617 }
1618 break;
1619
1620 case RFCOMM_TEST:
1621 if (cr)
1622 rfcomm_send_test(s, 0, skb->data, skb->len);
1623 break;
1624
1625 case RFCOMM_NSC:
1626 break;
1627
1628 default:
1629 BT_ERR("Unknown control type 0x%02x", type);
1630 rfcomm_send_nsc(s, cr, type);
1631 break;
1632 }
1633 return 0;
1634}
1635
1636static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb)
1637{
1638 struct rfcomm_dlc *d;
1639
1640 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf);
1641
1642 d = rfcomm_dlc_get(s, dlci);
1643 if (!d) {
1644 rfcomm_send_dm(s, dlci);
1645 goto drop;
1646 }
1647
1648 if (pf && d->cfc) {
1649 u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);
1650
1651 d->tx_credits += credits;
1652 if (d->tx_credits)
1653 clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1654 }
1655
1656 if (skb->len && d->state == BT_CONNECTED) {
1657 rfcomm_dlc_lock(d);
1658 d->rx_credits--;
1659 d->data_ready(d, skb);
1660 rfcomm_dlc_unlock(d);
1661 return 0;
1662 }
1663
1664drop:
1665 kfree_skb(skb);
1666 return 0;
1667}
1668
1669static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb)
1670{
1671 struct rfcomm_hdr *hdr = (void *) skb->data;
1672 u8 type, dlci, fcs;
1673
1674 dlci = __get_dlci(hdr->addr);
1675 type = __get_type(hdr->ctrl);
1676
1677 /* Trim FCS */
1678 skb->len--; skb->tail--;
27a884dc 1679 fcs = *(u8 *)skb_tail_pointer(skb);
1da177e4
LT		 1680
1681 if (__check_fcs(skb->data, type, fcs)) {
1682 BT_ERR("bad checksum in packet");
1683 kfree_skb(skb);
1684 return -EILSEQ;
1685 }
1686
1687 if (__test_ea(hdr->len))
1688 skb_pull(skb, 3);
1689 else
1690 skb_pull(skb, 4);
1691
1692 switch (type) {
1693 case RFCOMM_SABM:
1694 if (__test_pf(hdr->ctrl))
1695 rfcomm_recv_sabm(s, dlci);
1696 break;
1697
1698 case RFCOMM_DISC:
1699 if (__test_pf(hdr->ctrl))
1700 rfcomm_recv_disc(s, dlci);
1701 break;
1702
1703 case RFCOMM_UA:
1704 if (__test_pf(hdr->ctrl))
1705 rfcomm_recv_ua(s, dlci);
1706 break;
1707
1708 case RFCOMM_DM:
1709 rfcomm_recv_dm(s, dlci);
1710 break;
1711
1712 case RFCOMM_UIH:
1713 if (dlci)
1714 return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
1715
1716 rfcomm_recv_mcc(s, skb);
1717 break;
1718
1719 default:
5017d8dd 1720 BT_ERR("Unknown packet type 0x%02x", type);
1da177e4
LT		 1721 break;
1722 }
1723 kfree_skb(skb);
1724 return 0;
1725}
1726
1727/* ---- Connection and data processing ---- */
1728
1729static void rfcomm_process_connect(struct rfcomm_session *s)
1730{
1731 struct rfcomm_dlc *d;
1732 struct list_head *p, *n;
1733
1734 BT_DBG("session %p state %ld", s, s->state);
1735
1736 list_for_each_safe(p, n, &s->dlcs) {
1737 d = list_entry(p, struct rfcomm_dlc, list);
1738 if (d->state == BT_CONFIG) {
1739 d->mtu = s->mtu;
9f2c8a03 1740 if (rfcomm_check_security(d)) {
8c1b2355
MH		 1741 rfcomm_send_pn(s, 1, d);
1742 } else {
77db1980
MH		 1743 set_bit(RFCOMM_AUTH_PENDING, &d->flags);
1744 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
8c1b2355 1745 }
1da177e4
LT		 1746 }
1747 }
1748}
1749
1750/* Send data queued for the DLC.
1751 * Return number of frames left in the queue.
1752 */
1753static inline int rfcomm_process_tx(struct rfcomm_dlc *d)
1754{
1755 struct sk_buff *skb;
1756 int err;
1757
8e87d142 1758 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
1da177e4
LT		 1759 d, d->state, d->cfc, d->rx_credits, d->tx_credits);
1760
1761 /* Send pending MSC */
1762 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
8e87d142 1763 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
1da177e4
LT		 1764
1765 if (d->cfc) {
8e87d142 1766 /* CFC enabled.
1da177e4
LT		 1767 * Give them some credits */
1768 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
8e87d142 1769 d->rx_credits <= (d->cfc >> 2)) {
1da177e4
LT		 1770 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits);
1771 d->rx_credits = d->cfc;
1772 }
1773 } else {
1774 /* CFC disabled.
1775 * Give ourselves some credits */
1776 d->tx_credits = 5;
1777 }
1778
1779 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags))
1780 return skb_queue_len(&d->tx_queue);
1781
1782 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) {
5436538f 1783 err = rfcomm_send_frame(d->session, skb->data, skb->len);
1da177e4
LT		 1784 if (err < 0) {
1785 skb_queue_head(&d->tx_queue, skb);
1786 break;
1787 }
1788 kfree_skb(skb);
1789 d->tx_credits--;
1790 }
1791
1792 if (d->cfc && !d->tx_credits) {
1793 /* We're out of TX credits.
1794 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
1795 set_bit(RFCOMM_TX_THROTTLED, &d->flags);
1796 }
1797
1798 return skb_queue_len(&d->tx_queue);
1799}
1800
1801static inline void rfcomm_process_dlcs(struct rfcomm_session *s)
1802{
1803 struct rfcomm_dlc *d;
1804 struct list_head *p, *n;
1805
1806 BT_DBG("session %p state %ld", s, s->state);
1807
1808 list_for_each_safe(p, n, &s->dlcs) {
1809 d = list_entry(p, struct rfcomm_dlc, list);
1810
1811 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
1812 __rfcomm_dlc_close(d, ETIMEDOUT);
1813 continue;
1814 }
1815
db54467a
SJ		 1816 if (test_bit(RFCOMM_ENC_DROP, &d->flags)) {
1817 __rfcomm_dlc_close(d, ECONNREFUSED);
1818 continue;
1819 }
1820
1da177e4
LT		 1821 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) {
1822 rfcomm_dlc_clear_timer(d);
77db1980
MH		 1823 if (d->out) {
1824 rfcomm_send_pn(s, 1, d);
1825 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
bb23c0ab
MH		 1826 } else {
1827 if (d->defer_setup) {
1828 set_bit(RFCOMM_DEFER_SETUP, &d->flags);
1829 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
8bf47941
MH		 1830
1831 rfcomm_dlc_lock(d);
1832 d->state = BT_CONNECT2;
1833 d->state_change(d, 0);
1834 rfcomm_dlc_unlock(d);
bb23c0ab
MH		 1835 } else
1836 rfcomm_dlc_accept(d);
1837 }
1da177e4
LT		 1838 continue;
1839 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
1840 rfcomm_dlc_clear_timer(d);
77db1980
MH		 1841 if (!d->out)
1842 rfcomm_send_dm(s, d->dlci);
1843 else
1844 d->state = BT_CLOSED;
1da177e4
LT		 1845 __rfcomm_dlc_close(d, ECONNREFUSED);
1846 continue;
1847 }
1848
6e1031a4
JG		 1849 if (test_bit(RFCOMM_SEC_PENDING, &d->flags))
1850 continue;
1851
1da177e4
LT		 1852 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
1853 continue;
1854
1855 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
77db1980 1856 d->mscex == RFCOMM_MSCEX_OK)
1da177e4
LT		 1857 rfcomm_process_tx(d);
1858 }
1859}
1860
1861static inline void rfcomm_process_rx(struct rfcomm_session *s)
1862{
1863 struct socket *sock = s->sock;
1864 struct sock *sk = sock->sk;
1865 struct sk_buff *skb;
1866
1867 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue));
1868
1869 /* Get data directly from socket receive queue without copying it. */
1870 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
1871 skb_orphan(skb);
44935720
MM		 1872 if (!skb_linearize(skb))
1873 rfcomm_recv_frame(s, skb);
1874 else
1875 kfree_skb(skb);
1da177e4
LT		 1876 }
1877
1878 if (sk->sk_state == BT_CLOSED) {
1879 if (!s->initiator)
1880 rfcomm_session_put(s);
1881
1882 rfcomm_session_close(s, sk->sk_err);
1883 }
1884}
1885
1886static inline void rfcomm_accept_connection(struct rfcomm_session *s)
1887{
1888 struct socket *sock = s->sock, *nsock;
1889 int err;
1890
1891 /* Fast check for a new connection.
1892 * Avoids unnesesary socket allocations. */
1893 if (list_empty(&bt_sk(sock->sk)->accept_q))
1894 return;
1895
1896 BT_DBG("session %p", s);
1897
48db9ca4
MH		 1898 err = kernel_accept(sock, &nsock, O_NONBLOCK);
1899 if (err < 0)
1da177e4
LT		 1900 return;
1901
1da177e4
LT		 1902 /* Set our callbacks */
1903 nsock->sk->sk_data_ready = rfcomm_l2data_ready;
1904 nsock->sk->sk_state_change = rfcomm_l2state_change;
1905
1906 s = rfcomm_session_add(nsock, BT_OPEN);
1907 if (s) {
1908 rfcomm_session_hold(s);
98bcd08b
MH		 1909
1910 /* We should adjust MTU on incoming sessions.
1911 * L2CAP MTU minus UIH header and FCS. */
0c1bc5c6
GP		 1912 s->mtu = min(l2cap_pi(nsock->sk)->chan->omtu,
1913 l2cap_pi(nsock->sk)->chan->imtu) - 5;
98bcd08b 1914
534c92fd 1915 rfcomm_schedule();
1da177e4
LT		 1916 } else
1917 sock_release(nsock);
1918}
1919
1920static inline void rfcomm_check_connection(struct rfcomm_session *s)
1921{
1922 struct sock *sk = s->sock->sk;
1923
1924 BT_DBG("%p state %ld", s, s->state);
1925
285b4e90 1926 switch (sk->sk_state) {
1da177e4
LT		 1927 case BT_CONNECTED:
1928 s->state = BT_CONNECT;
1929
1930 /* We can adjust MTU on outgoing sessions.
1931 * L2CAP MTU minus UIH header and FCS. */
0c1bc5c6 1932 s->mtu = min(l2cap_pi(sk)->chan->omtu, l2cap_pi(sk)->chan->imtu) - 5;
1da177e4
LT		 1933
1934 rfcomm_send_sabm(s, 0);
1935 break;
1936
1937 case BT_CLOSED:
1938 s->state = BT_CLOSED;
1939 rfcomm_session_close(s, sk->sk_err);
1940 break;
1941 }
1942}
1943
1944static inline void rfcomm_process_sessions(void)
1945{
1946 struct list_head *p, *n;
1947
1948 rfcomm_lock();
1949
1950 list_for_each_safe(p, n, &session_list) {
1951 struct rfcomm_session *s;
1952 s = list_entry(p, struct rfcomm_session, list);
1953
9e726b17
LAD		 1954 if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
1955 s->state = BT_DISCONN;
1956 rfcomm_send_disc(s, 0);
485f1eff 1957 rfcomm_session_put(s);
9e726b17
LAD		 1958 continue;
1959 }
1960
1da177e4
LT		 1961 if (s->state == BT_LISTEN) {
1962 rfcomm_accept_connection(s);
1963 continue;
1964 }
1965
1966 rfcomm_session_hold(s);
1967
1968 switch (s->state) {
1969 case BT_BOUND:
1970 rfcomm_check_connection(s);
1971 break;
1972
1973 default:
1974 rfcomm_process_rx(s);
1975 break;
1976 }
1977
1978 rfcomm_process_dlcs(s);
1979
1980 rfcomm_session_put(s);
1981 }
1982
1983 rfcomm_unlock();
1984}
1985
1da177e4
LT		 1986static int rfcomm_add_listener(bdaddr_t *ba)
1987{
1988 struct sockaddr_l2 addr;
1989 struct socket *sock;
1990 struct sock *sk;
1991 struct rfcomm_session *s;
1992 int err = 0;
1993
1994 /* Create socket */
1995 err = rfcomm_l2sock_create(&sock);
8e87d142 1996 if (err < 0) {
1da177e4
LT		 1997 BT_ERR("Create socket failed %d", err);
1998 return err;
1999 }
2000
2001 /* Bind socket */
2002 bacpy(&addr.l2_bdaddr, ba);
2003 addr.l2_family = AF_BLUETOOTH;
b4324b5d 2004 addr.l2_psm = cpu_to_le16(RFCOMM_PSM);
37e62f55 2005 addr.l2_cid = 0;
48db9ca4 2006 err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
1da177e4
LT		 2007 if (err < 0) {
2008 BT_ERR("Bind failed %d", err);
2009 goto failed;
2010 }
2011
2012 /* Set L2CAP options */
2013 sk = sock->sk;
2014 lock_sock(sk);
0c1bc5c6 2015 l2cap_pi(sk)->chan->imtu = l2cap_mtu;
1da177e4
LT		 2016 release_sock(sk);
2017
2018 /* Start listening on the socket */
48db9ca4 2019 err = kernel_listen(sock, 10);
1da177e4
LT		 2020 if (err) {
2021 BT_ERR("Listen failed %d", err);
2022 goto failed;
2023 }
2024
2025 /* Add listening session */
2026 s = rfcomm_session_add(sock, BT_LISTEN);
2027 if (!s)
2028 goto failed;
2029
2030 rfcomm_session_hold(s);
2031 return 0;
2032failed:
2033 sock_release(sock);
2034 return err;
2035}
2036
2037static void rfcomm_kill_listener(void)
2038{
2039 struct rfcomm_session *s;
2040 struct list_head *p, *n;
2041
2042 BT_DBG("");
2043
2044 list_for_each_safe(p, n, &session_list) {
2045 s = list_entry(p, struct rfcomm_session, list);
2046 rfcomm_session_del(s);
2047 }
2048}
2049
2050static int rfcomm_run(void *unused)
2051{
a524eccc 2052 BT_DBG("");
1da177e4 2053
1da177e4 2054 set_user_nice(current, -10);
1da177e4 2055
1da177e4
LT		 2056 rfcomm_add_listener(BDADDR_ANY);
2057
e5842cdb 2058 while (1) {
a524eccc 2059 set_current_state(TASK_INTERRUPTIBLE);
e5842cdb
PH		 2060
2061 if (kthread_should_stop())
2062 break;
a524eccc
MH		 2063
2064 /* Process stuff */
a524eccc 2065 rfcomm_process_sessions();
e5842cdb
PH		 2066
2067 schedule();
a524eccc 2068 }
e5842cdb 2069 __set_current_state(TASK_RUNNING);
1da177e4
LT		 2070
2071 rfcomm_kill_listener();
2072
1da177e4
LT		 2073 return 0;
2074}
2075
8c1b2355 2076static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
1da177e4
LT		 2077{
2078 struct rfcomm_session *s;
2079 struct rfcomm_dlc *d;
2080 struct list_head *p, *n;
2081
2082 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);
2083
2084 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
2085 if (!s)
2086 return;
2087
2088 rfcomm_session_hold(s);
2089
2090 list_for_each_safe(p, n, &s->dlcs) {
2091 d = list_entry(p, struct rfcomm_dlc, list);
2092
8c84b830
MH		 2093 if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) {
2094 rfcomm_dlc_clear_timer(d);
2095 if (status || encrypt == 0x00) {
db54467a 2096 set_bit(RFCOMM_ENC_DROP, &d->flags);
8c84b830
MH		 2097 continue;
2098 }
2099 }
2100
2101 if (d->state == BT_CONNECTED && !status && encrypt == 0x00) {
2102 if (d->sec_level == BT_SECURITY_MEDIUM) {
2103 set_bit(RFCOMM_SEC_PENDING, &d->flags);
2104 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
2105 continue;
2106 } else if (d->sec_level == BT_SECURITY_HIGH) {
db54467a 2107 set_bit(RFCOMM_ENC_DROP, &d->flags);
8c84b830
MH		 2108 continue;
2109 }
9719f8af
MH		 2110 }
2111
1da177e4
LT		 2112 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
2113 continue;
2114
b3b1b061 2115 if (!status && hci_conn_check_secure(conn, d->sec_level))
1da177e4
LT		 2116 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
2117 else
2118 set_bit(RFCOMM_AUTH_REJECT, &d->flags);
2119 }
2120
2121 rfcomm_session_put(s);
2122
534c92fd 2123 rfcomm_schedule();
1da177e4
LT		 2124}
2125
2126static struct hci_cb rfcomm_cb = {
2127 .name = "RFCOMM",
8c1b2355 2128 .security_cfm = rfcomm_security_cfm
1da177e4
LT		 2129};
2130
aef7d97c 2131static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x)
1da177e4
LT		 2132{
2133 struct rfcomm_session *s;
1da177e4
LT		 2134
2135 rfcomm_lock();
2136
8035ded4
LAD		 2137 list_for_each_entry(s, &session_list, list) {
2138 struct rfcomm_dlc *d;
2139 list_for_each_entry(d, &s->dlcs, list) {
be9d1227 2140 struct sock *sk = s->sock->sk;
1da177e4 2141
aef7d97c
MH		 2142 seq_printf(f, "%s %s %ld %d %d %d %d\n",
2143 batostr(&bt_sk(sk)->src),
2144 batostr(&bt_sk(sk)->dst),
2145 d->state, d->dlci, d->mtu,
2146 d->rx_credits, d->tx_credits);
1da177e4
LT		 2147 }
2148 }
1da177e4 2149
1da177e4 2150 rfcomm_unlock();
1da177e4 2151
aef7d97c
MH		 2152 return 0;
2153}
2154
2155static int rfcomm_dlc_debugfs_open(struct inode *inode, struct file *file)
2156{
2157 return single_open(file, rfcomm_dlc_debugfs_show, inode->i_private);
1da177e4
LT		 2158}
2159
aef7d97c
MH		 2160static const struct file_operations rfcomm_dlc_debugfs_fops = {
2161 .open = rfcomm_dlc_debugfs_open,
2162 .read = seq_read,
2163 .llseek = seq_lseek,
2164 .release = single_release,
2165};
2166
2167static struct dentry *rfcomm_dlc_debugfs;
1da177e4
LT		 2168
2169/* ---- Initialization ---- */
2170static int __init rfcomm_init(void)
2171{
52d18347 2172 int err;
af0d3b10 2173
1da177e4
LT		 2174 hci_register_cb(&rfcomm_cb);
2175
a524eccc
MH		 2176 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
2177 if (IS_ERR(rfcomm_thread)) {
52d18347
MH		 2178 err = PTR_ERR(rfcomm_thread);
2179 goto unregister;
a524eccc 2180 }
1da177e4 2181
aef7d97c
MH		 2182 if (bt_debugfs) {
2183 rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444,
2184 bt_debugfs, NULL, &rfcomm_dlc_debugfs_fops);
2185 if (!rfcomm_dlc_debugfs)
2186 BT_ERR("Failed to create RFCOMM debug file");
2187 }
1da177e4 2188
52d18347
MH		 2189 err = rfcomm_init_ttys();
2190 if (err < 0)
2191 goto stop;
1da177e4 2192
52d18347
MH		 2193 err = rfcomm_init_sockets();
2194 if (err < 0)
2195 goto cleanup;
1da177e4 2196
be9d1227
MH		 2197 BT_INFO("RFCOMM ver %s", VERSION);
2198
1da177e4 2199 return 0;
af0d3b10 2200
52d18347 2201cleanup:
af0d3b10 2202 rfcomm_cleanup_ttys();
52d18347
MH		 2203
2204stop:
af0d3b10 2205 kthread_stop(rfcomm_thread);
52d18347
MH		 2206
2207unregister:
af0d3b10
DY		 2208 hci_unregister_cb(&rfcomm_cb);
2209
52d18347 2210 return err;
1da177e4
LT		 2211}
2212
2213static void __exit rfcomm_exit(void)
2214{
aef7d97c 2215 debugfs_remove(rfcomm_dlc_debugfs);
be9d1227 2216
1da177e4
LT		 2217 hci_unregister_cb(&rfcomm_cb);
2218
a524eccc 2219 kthread_stop(rfcomm_thread);
1da177e4 2220
1da177e4 2221 rfcomm_cleanup_ttys();
1da177e4
LT		 2222
2223 rfcomm_cleanup_sockets();
1da177e4
LT		 2224}
2225
2226module_init(rfcomm_init);
2227module_exit(rfcomm_exit);
2228
7c2660b0
MH		 2229module_param(disable_cfc, bool, 0644);
2230MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
2231
98bcd08b
MH		 2232module_param(channel_mtu, int, 0644);
2233MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
2234
56f3a40a
MH		 2235module_param(l2cap_mtu, uint, 0644);
2236MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");
2237
eae38eed
MH		 2238module_param(l2cap_ertm, bool, 0644);
2239MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection");
2240
63fbd24e 2241MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 2242MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
2243MODULE_VERSION(VERSION);
2244MODULE_LICENSE("GPL");
2245MODULE_ALIAS("bt-proto-3");
kernel source for telekom puls (alcatel/mediatek)