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1da177e4 LT |
1 | /* |
2 | RFCOMM implementation for Linux Bluetooth stack (BlueZ). | |
3 | Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org> | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License version 2 as | |
8 | published by the Free Software Foundation; | |
9 | ||
10 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
11 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
12 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
13 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
14 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
15 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
17 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
18 | ||
19 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
20 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
21 | SOFTWARE IS DISCLAIMED. | |
22 | */ | |
23 | ||
24 | /* | |
25 | RPN support - Dirk Husemann <hud@zurich.ibm.com> | |
26 | */ | |
27 | ||
28 | /* | |
29 | * Bluetooth RFCOMM core. | |
30 | * | |
31 | * $Id: core.c,v 1.42 2002/10/01 23:26:25 maxk Exp $ | |
32 | */ | |
33 | ||
34 | #include <linux/config.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/errno.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/sched.h> | |
39 | #include <linux/signal.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/wait.h> | |
42 | #include <linux/net.h> | |
43 | #include <linux/proc_fs.h> | |
44 | #include <linux/seq_file.h> | |
45 | #include <net/sock.h> | |
46 | #include <asm/uaccess.h> | |
47 | #include <asm/unaligned.h> | |
48 | ||
49 | #include <net/bluetooth/bluetooth.h> | |
50 | #include <net/bluetooth/hci_core.h> | |
51 | #include <net/bluetooth/l2cap.h> | |
52 | #include <net/bluetooth/rfcomm.h> | |
53 | ||
54 | #define VERSION "1.5" | |
55 | ||
56 | #ifndef CONFIG_BT_RFCOMM_DEBUG | |
57 | #undef BT_DBG | |
58 | #define BT_DBG(D...) | |
59 | #endif | |
60 | ||
61 | #ifdef CONFIG_PROC_FS | |
62 | struct proc_dir_entry *proc_bt_rfcomm; | |
63 | #endif | |
64 | ||
65 | static struct task_struct *rfcomm_thread; | |
66 | ||
67 | static DECLARE_MUTEX(rfcomm_sem); | |
68 | #define rfcomm_lock() down(&rfcomm_sem); | |
69 | #define rfcomm_unlock() up(&rfcomm_sem); | |
70 | ||
71 | static unsigned long rfcomm_event; | |
72 | ||
73 | static LIST_HEAD(session_list); | |
74 | static atomic_t terminate, running; | |
75 | ||
76 | static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len); | |
77 | static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci); | |
78 | static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci); | |
79 | static int rfcomm_queue_disc(struct rfcomm_dlc *d); | |
80 | static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type); | |
81 | static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d); | |
82 | static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig); | |
83 | static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len); | |
84 | static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits); | |
85 | static void rfcomm_make_uih(struct sk_buff *skb, u8 addr); | |
86 | ||
87 | static void rfcomm_process_connect(struct rfcomm_session *s); | |
88 | ||
89 | static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err); | |
90 | static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst); | |
91 | static void rfcomm_session_del(struct rfcomm_session *s); | |
92 | ||
93 | /* ---- RFCOMM frame parsing macros ---- */ | |
94 | #define __get_dlci(b) ((b & 0xfc) >> 2) | |
95 | #define __get_channel(b) ((b & 0xf8) >> 3) | |
96 | #define __get_dir(b) ((b & 0x04) >> 2) | |
97 | #define __get_type(b) ((b & 0xef)) | |
98 | ||
99 | #define __test_ea(b) ((b & 0x01)) | |
100 | #define __test_cr(b) ((b & 0x02)) | |
101 | #define __test_pf(b) ((b & 0x10)) | |
102 | ||
103 | #define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01) | |
104 | #define __ctrl(type, pf) (((type & 0xef) | (pf << 4))) | |
105 | #define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir) | |
106 | #define __srv_channel(dlci) (dlci >> 1) | |
107 | #define __dir(dlci) (dlci & 0x01) | |
108 | ||
109 | #define __len8(len) (((len) << 1) | 1) | |
110 | #define __len16(len) ((len) << 1) | |
111 | ||
112 | /* MCC macros */ | |
113 | #define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01)) | |
114 | #define __get_mcc_type(b) ((b & 0xfc) >> 2) | |
115 | #define __get_mcc_len(b) ((b & 0xfe) >> 1) | |
116 | ||
117 | /* RPN macros */ | |
118 | #define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x3) << 3)) | |
119 | #define __get_rpn_data_bits(line) ((line) & 0x3) | |
120 | #define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1) | |
121 | #define __get_rpn_parity(line) (((line) >> 3) & 0x3) | |
122 | ||
123 | static inline void rfcomm_schedule(uint event) | |
124 | { | |
125 | if (!rfcomm_thread) | |
126 | return; | |
127 | //set_bit(event, &rfcomm_event); | |
128 | set_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event); | |
129 | wake_up_process(rfcomm_thread); | |
130 | } | |
131 | ||
132 | static inline void rfcomm_session_put(struct rfcomm_session *s) | |
133 | { | |
134 | if (atomic_dec_and_test(&s->refcnt)) | |
135 | rfcomm_session_del(s); | |
136 | } | |
137 | ||
138 | /* ---- RFCOMM FCS computation ---- */ | |
139 | ||
140 | /* CRC on 2 bytes */ | |
141 | #define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]]) | |
142 | ||
143 | /* FCS on 2 bytes */ | |
144 | static inline u8 __fcs(u8 *data) | |
145 | { | |
146 | return (0xff - __crc(data)); | |
147 | } | |
148 | ||
149 | /* FCS on 3 bytes */ | |
150 | static inline u8 __fcs2(u8 *data) | |
151 | { | |
152 | return (0xff - rfcomm_crc_table[__crc(data) ^ data[2]]); | |
153 | } | |
154 | ||
155 | /* Check FCS */ | |
156 | static inline int __check_fcs(u8 *data, int type, u8 fcs) | |
157 | { | |
158 | u8 f = __crc(data); | |
159 | ||
160 | if (type != RFCOMM_UIH) | |
161 | f = rfcomm_crc_table[f ^ data[2]]; | |
162 | ||
163 | return rfcomm_crc_table[f ^ fcs] != 0xcf; | |
164 | } | |
165 | ||
166 | /* ---- L2CAP callbacks ---- */ | |
167 | static void rfcomm_l2state_change(struct sock *sk) | |
168 | { | |
169 | BT_DBG("%p state %d", sk, sk->sk_state); | |
170 | rfcomm_schedule(RFCOMM_SCHED_STATE); | |
171 | } | |
172 | ||
173 | static void rfcomm_l2data_ready(struct sock *sk, int bytes) | |
174 | { | |
175 | BT_DBG("%p bytes %d", sk, bytes); | |
176 | rfcomm_schedule(RFCOMM_SCHED_RX); | |
177 | } | |
178 | ||
179 | static int rfcomm_l2sock_create(struct socket **sock) | |
180 | { | |
181 | int err; | |
182 | ||
183 | BT_DBG(""); | |
184 | ||
185 | err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock); | |
186 | if (!err) { | |
187 | struct sock *sk = (*sock)->sk; | |
188 | sk->sk_data_ready = rfcomm_l2data_ready; | |
189 | sk->sk_state_change = rfcomm_l2state_change; | |
190 | } | |
191 | return err; | |
192 | } | |
193 | ||
194 | /* ---- RFCOMM DLCs ---- */ | |
195 | static void rfcomm_dlc_timeout(unsigned long arg) | |
196 | { | |
197 | struct rfcomm_dlc *d = (void *) arg; | |
198 | ||
199 | BT_DBG("dlc %p state %ld", d, d->state); | |
200 | ||
201 | set_bit(RFCOMM_TIMED_OUT, &d->flags); | |
202 | rfcomm_dlc_put(d); | |
203 | rfcomm_schedule(RFCOMM_SCHED_TIMEO); | |
204 | } | |
205 | ||
206 | static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout) | |
207 | { | |
208 | BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout); | |
209 | ||
210 | if (!mod_timer(&d->timer, jiffies + timeout)) | |
211 | rfcomm_dlc_hold(d); | |
212 | } | |
213 | ||
214 | static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d) | |
215 | { | |
216 | BT_DBG("dlc %p state %ld", d, d->state); | |
217 | ||
218 | if (timer_pending(&d->timer) && del_timer(&d->timer)) | |
219 | rfcomm_dlc_put(d); | |
220 | } | |
221 | ||
222 | static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d) | |
223 | { | |
224 | BT_DBG("%p", d); | |
225 | ||
226 | d->state = BT_OPEN; | |
227 | d->flags = 0; | |
228 | d->mscex = 0; | |
229 | d->mtu = RFCOMM_DEFAULT_MTU; | |
230 | d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV; | |
231 | ||
232 | d->cfc = RFCOMM_CFC_DISABLED; | |
233 | d->rx_credits = RFCOMM_DEFAULT_CREDITS; | |
234 | } | |
235 | ||
236 | struct rfcomm_dlc *rfcomm_dlc_alloc(int prio) | |
237 | { | |
238 | struct rfcomm_dlc *d = kmalloc(sizeof(*d), prio); | |
239 | if (!d) | |
240 | return NULL; | |
241 | memset(d, 0, sizeof(*d)); | |
242 | ||
243 | init_timer(&d->timer); | |
244 | d->timer.function = rfcomm_dlc_timeout; | |
245 | d->timer.data = (unsigned long) d; | |
246 | ||
247 | skb_queue_head_init(&d->tx_queue); | |
248 | spin_lock_init(&d->lock); | |
249 | atomic_set(&d->refcnt, 1); | |
250 | ||
251 | rfcomm_dlc_clear_state(d); | |
252 | ||
253 | BT_DBG("%p", d); | |
254 | return d; | |
255 | } | |
256 | ||
257 | void rfcomm_dlc_free(struct rfcomm_dlc *d) | |
258 | { | |
259 | BT_DBG("%p", d); | |
260 | ||
261 | skb_queue_purge(&d->tx_queue); | |
262 | kfree(d); | |
263 | } | |
264 | ||
265 | static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d) | |
266 | { | |
267 | BT_DBG("dlc %p session %p", d, s); | |
268 | ||
269 | rfcomm_session_hold(s); | |
270 | ||
271 | rfcomm_dlc_hold(d); | |
272 | list_add(&d->list, &s->dlcs); | |
273 | d->session = s; | |
274 | } | |
275 | ||
276 | static void rfcomm_dlc_unlink(struct rfcomm_dlc *d) | |
277 | { | |
278 | struct rfcomm_session *s = d->session; | |
279 | ||
280 | BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s); | |
281 | ||
282 | list_del(&d->list); | |
283 | d->session = NULL; | |
284 | rfcomm_dlc_put(d); | |
285 | ||
286 | rfcomm_session_put(s); | |
287 | } | |
288 | ||
289 | static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci) | |
290 | { | |
291 | struct rfcomm_dlc *d; | |
292 | struct list_head *p; | |
293 | ||
294 | list_for_each(p, &s->dlcs) { | |
295 | d = list_entry(p, struct rfcomm_dlc, list); | |
296 | if (d->dlci == dlci) | |
297 | return d; | |
298 | } | |
299 | return NULL; | |
300 | } | |
301 | ||
302 | static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) | |
303 | { | |
304 | struct rfcomm_session *s; | |
305 | int err = 0; | |
306 | u8 dlci; | |
307 | ||
308 | BT_DBG("dlc %p state %ld %s %s channel %d", | |
309 | d, d->state, batostr(src), batostr(dst), channel); | |
310 | ||
311 | if (channel < 1 || channel > 30) | |
312 | return -EINVAL; | |
313 | ||
314 | if (d->state != BT_OPEN && d->state != BT_CLOSED) | |
315 | return 0; | |
316 | ||
317 | s = rfcomm_session_get(src, dst); | |
318 | if (!s) { | |
319 | s = rfcomm_session_create(src, dst, &err); | |
320 | if (!s) | |
321 | return err; | |
322 | } | |
323 | ||
324 | dlci = __dlci(!s->initiator, channel); | |
325 | ||
326 | /* Check if DLCI already exists */ | |
327 | if (rfcomm_dlc_get(s, dlci)) | |
328 | return -EBUSY; | |
329 | ||
330 | rfcomm_dlc_clear_state(d); | |
331 | ||
332 | d->dlci = dlci; | |
333 | d->addr = __addr(s->initiator, dlci); | |
334 | d->priority = 7; | |
335 | ||
336 | d->state = BT_CONFIG; | |
337 | rfcomm_dlc_link(s, d); | |
338 | ||
339 | d->mtu = s->mtu; | |
340 | d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc; | |
341 | ||
342 | if (s->state == BT_CONNECTED) | |
343 | rfcomm_send_pn(s, 1, d); | |
344 | rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) | |
349 | { | |
350 | int r; | |
351 | ||
352 | rfcomm_lock(); | |
353 | ||
354 | r = __rfcomm_dlc_open(d, src, dst, channel); | |
355 | ||
356 | rfcomm_unlock(); | |
357 | return r; | |
358 | } | |
359 | ||
360 | static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err) | |
361 | { | |
362 | struct rfcomm_session *s = d->session; | |
363 | if (!s) | |
364 | return 0; | |
365 | ||
366 | BT_DBG("dlc %p state %ld dlci %d err %d session %p", | |
367 | d, d->state, d->dlci, err, s); | |
368 | ||
369 | switch (d->state) { | |
370 | case BT_CONNECTED: | |
371 | case BT_CONFIG: | |
372 | case BT_CONNECT: | |
373 | d->state = BT_DISCONN; | |
374 | if (skb_queue_empty(&d->tx_queue)) { | |
375 | rfcomm_send_disc(s, d->dlci); | |
376 | rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT); | |
377 | } else { | |
378 | rfcomm_queue_disc(d); | |
379 | rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2); | |
380 | } | |
381 | break; | |
382 | ||
383 | default: | |
384 | rfcomm_dlc_clear_timer(d); | |
385 | ||
386 | rfcomm_dlc_lock(d); | |
387 | d->state = BT_CLOSED; | |
388 | d->state_change(d, err); | |
389 | rfcomm_dlc_unlock(d); | |
390 | ||
391 | skb_queue_purge(&d->tx_queue); | |
392 | rfcomm_session_put(s); | |
393 | ||
394 | rfcomm_dlc_unlink(d); | |
395 | } | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | int rfcomm_dlc_close(struct rfcomm_dlc *d, int err) | |
401 | { | |
402 | int r; | |
403 | ||
404 | rfcomm_lock(); | |
405 | ||
406 | r = __rfcomm_dlc_close(d, err); | |
407 | ||
408 | rfcomm_unlock(); | |
409 | return r; | |
410 | } | |
411 | ||
412 | int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb) | |
413 | { | |
414 | int len = skb->len; | |
415 | ||
416 | if (d->state != BT_CONNECTED) | |
417 | return -ENOTCONN; | |
418 | ||
419 | BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len); | |
420 | ||
421 | if (len > d->mtu) | |
422 | return -EINVAL; | |
423 | ||
424 | rfcomm_make_uih(skb, d->addr); | |
425 | skb_queue_tail(&d->tx_queue, skb); | |
426 | ||
427 | if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags)) | |
428 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
429 | return len; | |
430 | } | |
431 | ||
432 | void fastcall __rfcomm_dlc_throttle(struct rfcomm_dlc *d) | |
433 | { | |
434 | BT_DBG("dlc %p state %ld", d, d->state); | |
435 | ||
436 | if (!d->cfc) { | |
437 | d->v24_sig |= RFCOMM_V24_FC; | |
438 | set_bit(RFCOMM_MSC_PENDING, &d->flags); | |
439 | } | |
440 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
441 | } | |
442 | ||
443 | void fastcall __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d) | |
444 | { | |
445 | BT_DBG("dlc %p state %ld", d, d->state); | |
446 | ||
447 | if (!d->cfc) { | |
448 | d->v24_sig &= ~RFCOMM_V24_FC; | |
449 | set_bit(RFCOMM_MSC_PENDING, &d->flags); | |
450 | } | |
451 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
452 | } | |
453 | ||
454 | /* | |
455 | Set/get modem status functions use _local_ status i.e. what we report | |
456 | to the other side. | |
457 | Remote status is provided by dlc->modem_status() callback. | |
458 | */ | |
459 | int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig) | |
460 | { | |
461 | BT_DBG("dlc %p state %ld v24_sig 0x%x", | |
462 | d, d->state, v24_sig); | |
463 | ||
464 | if (test_bit(RFCOMM_RX_THROTTLED, &d->flags)) | |
465 | v24_sig |= RFCOMM_V24_FC; | |
466 | else | |
467 | v24_sig &= ~RFCOMM_V24_FC; | |
468 | ||
469 | d->v24_sig = v24_sig; | |
470 | ||
471 | if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags)) | |
472 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig) | |
478 | { | |
479 | BT_DBG("dlc %p state %ld v24_sig 0x%x", | |
480 | d, d->state, d->v24_sig); | |
481 | ||
482 | *v24_sig = d->v24_sig; | |
483 | return 0; | |
484 | } | |
485 | ||
486 | /* ---- RFCOMM sessions ---- */ | |
487 | static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state) | |
488 | { | |
489 | struct rfcomm_session *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
490 | if (!s) | |
491 | return NULL; | |
492 | memset(s, 0, sizeof(*s)); | |
493 | ||
494 | BT_DBG("session %p sock %p", s, sock); | |
495 | ||
496 | INIT_LIST_HEAD(&s->dlcs); | |
497 | s->state = state; | |
498 | s->sock = sock; | |
499 | ||
500 | s->mtu = RFCOMM_DEFAULT_MTU; | |
501 | s->cfc = RFCOMM_CFC_UNKNOWN; | |
502 | ||
503 | /* Do not increment module usage count for listening sessions. | |
504 | * Otherwise we won't be able to unload the module. */ | |
505 | if (state != BT_LISTEN) | |
506 | if (!try_module_get(THIS_MODULE)) { | |
507 | kfree(s); | |
508 | return NULL; | |
509 | } | |
510 | ||
511 | list_add(&s->list, &session_list); | |
512 | ||
513 | return s; | |
514 | } | |
515 | ||
516 | static void rfcomm_session_del(struct rfcomm_session *s) | |
517 | { | |
518 | int state = s->state; | |
519 | ||
520 | BT_DBG("session %p state %ld", s, s->state); | |
521 | ||
522 | list_del(&s->list); | |
523 | ||
524 | if (state == BT_CONNECTED) | |
525 | rfcomm_send_disc(s, 0); | |
526 | ||
527 | sock_release(s->sock); | |
528 | kfree(s); | |
529 | ||
530 | if (state != BT_LISTEN) | |
531 | module_put(THIS_MODULE); | |
532 | } | |
533 | ||
534 | static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst) | |
535 | { | |
536 | struct rfcomm_session *s; | |
537 | struct list_head *p, *n; | |
538 | struct bt_sock *sk; | |
539 | list_for_each_safe(p, n, &session_list) { | |
540 | s = list_entry(p, struct rfcomm_session, list); | |
541 | sk = bt_sk(s->sock->sk); | |
542 | ||
543 | if ((!bacmp(src, BDADDR_ANY) || !bacmp(&sk->src, src)) && | |
544 | !bacmp(&sk->dst, dst)) | |
545 | return s; | |
546 | } | |
547 | return NULL; | |
548 | } | |
549 | ||
550 | static void rfcomm_session_close(struct rfcomm_session *s, int err) | |
551 | { | |
552 | struct rfcomm_dlc *d; | |
553 | struct list_head *p, *n; | |
554 | ||
555 | BT_DBG("session %p state %ld err %d", s, s->state, err); | |
556 | ||
557 | rfcomm_session_hold(s); | |
558 | ||
559 | s->state = BT_CLOSED; | |
560 | ||
561 | /* Close all dlcs */ | |
562 | list_for_each_safe(p, n, &s->dlcs) { | |
563 | d = list_entry(p, struct rfcomm_dlc, list); | |
564 | d->state = BT_CLOSED; | |
565 | __rfcomm_dlc_close(d, err); | |
566 | } | |
567 | ||
568 | rfcomm_session_put(s); | |
569 | } | |
570 | ||
571 | static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err) | |
572 | { | |
573 | struct rfcomm_session *s = NULL; | |
574 | struct sockaddr_l2 addr; | |
575 | struct socket *sock; | |
576 | struct sock *sk; | |
577 | ||
578 | BT_DBG("%s %s", batostr(src), batostr(dst)); | |
579 | ||
580 | *err = rfcomm_l2sock_create(&sock); | |
581 | if (*err < 0) | |
582 | return NULL; | |
583 | ||
584 | bacpy(&addr.l2_bdaddr, src); | |
585 | addr.l2_family = AF_BLUETOOTH; | |
586 | addr.l2_psm = 0; | |
587 | *err = sock->ops->bind(sock, (struct sockaddr *) &addr, sizeof(addr)); | |
588 | if (*err < 0) | |
589 | goto failed; | |
590 | ||
591 | /* Set L2CAP options */ | |
592 | sk = sock->sk; | |
593 | lock_sock(sk); | |
594 | l2cap_pi(sk)->imtu = RFCOMM_MAX_L2CAP_MTU; | |
595 | release_sock(sk); | |
596 | ||
597 | s = rfcomm_session_add(sock, BT_BOUND); | |
598 | if (!s) { | |
599 | *err = -ENOMEM; | |
600 | goto failed; | |
601 | } | |
602 | ||
603 | rfcomm_session_hold(s); | |
604 | ||
605 | s->initiator = 1; | |
606 | ||
607 | bacpy(&addr.l2_bdaddr, dst); | |
608 | addr.l2_family = AF_BLUETOOTH; | |
609 | addr.l2_psm = htobs(RFCOMM_PSM); | |
610 | *err = sock->ops->connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK); | |
611 | if (*err == 0 || *err == -EAGAIN) | |
612 | return s; | |
613 | ||
614 | rfcomm_session_del(s); | |
615 | return NULL; | |
616 | ||
617 | failed: | |
618 | sock_release(sock); | |
619 | return NULL; | |
620 | } | |
621 | ||
622 | void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst) | |
623 | { | |
624 | struct sock *sk = s->sock->sk; | |
625 | if (src) | |
626 | bacpy(src, &bt_sk(sk)->src); | |
627 | if (dst) | |
628 | bacpy(dst, &bt_sk(sk)->dst); | |
629 | } | |
630 | ||
631 | /* ---- RFCOMM frame sending ---- */ | |
632 | static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len) | |
633 | { | |
634 | struct socket *sock = s->sock; | |
635 | struct kvec iv = { data, len }; | |
636 | struct msghdr msg; | |
637 | ||
638 | BT_DBG("session %p len %d", s, len); | |
639 | ||
640 | memset(&msg, 0, sizeof(msg)); | |
641 | ||
642 | return kernel_sendmsg(sock, &msg, &iv, 1, len); | |
643 | } | |
644 | ||
645 | static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci) | |
646 | { | |
647 | struct rfcomm_cmd cmd; | |
648 | ||
649 | BT_DBG("%p dlci %d", s, dlci); | |
650 | ||
651 | cmd.addr = __addr(s->initiator, dlci); | |
652 | cmd.ctrl = __ctrl(RFCOMM_SABM, 1); | |
653 | cmd.len = __len8(0); | |
654 | cmd.fcs = __fcs2((u8 *) &cmd); | |
655 | ||
656 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
657 | } | |
658 | ||
659 | static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci) | |
660 | { | |
661 | struct rfcomm_cmd cmd; | |
662 | ||
663 | BT_DBG("%p dlci %d", s, dlci); | |
664 | ||
665 | cmd.addr = __addr(!s->initiator, dlci); | |
666 | cmd.ctrl = __ctrl(RFCOMM_UA, 1); | |
667 | cmd.len = __len8(0); | |
668 | cmd.fcs = __fcs2((u8 *) &cmd); | |
669 | ||
670 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
671 | } | |
672 | ||
673 | static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci) | |
674 | { | |
675 | struct rfcomm_cmd cmd; | |
676 | ||
677 | BT_DBG("%p dlci %d", s, dlci); | |
678 | ||
679 | cmd.addr = __addr(s->initiator, dlci); | |
680 | cmd.ctrl = __ctrl(RFCOMM_DISC, 1); | |
681 | cmd.len = __len8(0); | |
682 | cmd.fcs = __fcs2((u8 *) &cmd); | |
683 | ||
684 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
685 | } | |
686 | ||
687 | static int rfcomm_queue_disc(struct rfcomm_dlc *d) | |
688 | { | |
689 | struct rfcomm_cmd *cmd; | |
690 | struct sk_buff *skb; | |
691 | ||
692 | BT_DBG("dlc %p dlci %d", d, d->dlci); | |
693 | ||
694 | skb = alloc_skb(sizeof(*cmd), GFP_KERNEL); | |
695 | if (!skb) | |
696 | return -ENOMEM; | |
697 | ||
698 | cmd = (void *) __skb_put(skb, sizeof(*cmd)); | |
699 | cmd->addr = d->addr; | |
700 | cmd->ctrl = __ctrl(RFCOMM_DISC, 1); | |
701 | cmd->len = __len8(0); | |
702 | cmd->fcs = __fcs2((u8 *) cmd); | |
703 | ||
704 | skb_queue_tail(&d->tx_queue, skb); | |
705 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
706 | return 0; | |
707 | } | |
708 | ||
709 | static int rfcomm_send_dm(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_DM, 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 | ||
723 | static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type) | |
724 | { | |
725 | struct rfcomm_hdr *hdr; | |
726 | struct rfcomm_mcc *mcc; | |
727 | u8 buf[16], *ptr = buf; | |
728 | ||
729 | BT_DBG("%p cr %d type %d", s, cr, type); | |
730 | ||
731 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
732 | hdr->addr = __addr(s->initiator, 0); | |
733 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
734 | hdr->len = __len8(sizeof(*mcc) + 1); | |
735 | ||
736 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
737 | mcc->type = __mcc_type(cr, RFCOMM_NSC); | |
738 | mcc->len = __len8(1); | |
739 | ||
740 | /* Type that we didn't like */ | |
741 | *ptr = __mcc_type(cr, type); ptr++; | |
742 | ||
743 | *ptr = __fcs(buf); ptr++; | |
744 | ||
745 | return rfcomm_send_frame(s, buf, ptr - buf); | |
746 | } | |
747 | ||
748 | static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d) | |
749 | { | |
750 | struct rfcomm_hdr *hdr; | |
751 | struct rfcomm_mcc *mcc; | |
752 | struct rfcomm_pn *pn; | |
753 | u8 buf[16], *ptr = buf; | |
754 | ||
755 | BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu); | |
756 | ||
757 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
758 | hdr->addr = __addr(s->initiator, 0); | |
759 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
760 | hdr->len = __len8(sizeof(*mcc) + sizeof(*pn)); | |
761 | ||
762 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
763 | mcc->type = __mcc_type(cr, RFCOMM_PN); | |
764 | mcc->len = __len8(sizeof(*pn)); | |
765 | ||
766 | pn = (void *) ptr; ptr += sizeof(*pn); | |
767 | pn->dlci = d->dlci; | |
768 | pn->priority = d->priority; | |
769 | pn->ack_timer = 0; | |
770 | pn->max_retrans = 0; | |
771 | ||
772 | if (s->cfc) { | |
773 | pn->flow_ctrl = cr ? 0xf0 : 0xe0; | |
774 | pn->credits = RFCOMM_DEFAULT_CREDITS; | |
775 | } else { | |
776 | pn->flow_ctrl = 0; | |
777 | pn->credits = 0; | |
778 | } | |
779 | ||
780 | pn->mtu = htobs(d->mtu); | |
781 | ||
782 | *ptr = __fcs(buf); ptr++; | |
783 | ||
784 | return rfcomm_send_frame(s, buf, ptr - buf); | |
785 | } | |
786 | ||
787 | static int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci, | |
788 | u8 bit_rate, u8 data_bits, u8 stop_bits, | |
789 | u8 parity, u8 flow_ctrl_settings, | |
790 | u8 xon_char, u8 xoff_char, u16 param_mask) | |
791 | { | |
792 | struct rfcomm_hdr *hdr; | |
793 | struct rfcomm_mcc *mcc; | |
794 | struct rfcomm_rpn *rpn; | |
795 | u8 buf[16], *ptr = buf; | |
796 | ||
797 | BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x" | |
798 | "flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x", | |
799 | s, cr, dlci, bit_rate, data_bits, stop_bits, parity, | |
800 | flow_ctrl_settings, xon_char, xoff_char, param_mask); | |
801 | ||
802 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
803 | hdr->addr = __addr(s->initiator, 0); | |
804 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
805 | hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn)); | |
806 | ||
807 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
808 | mcc->type = __mcc_type(cr, RFCOMM_RPN); | |
809 | mcc->len = __len8(sizeof(*rpn)); | |
810 | ||
811 | rpn = (void *) ptr; ptr += sizeof(*rpn); | |
812 | rpn->dlci = __addr(1, dlci); | |
813 | rpn->bit_rate = bit_rate; | |
814 | rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity); | |
815 | rpn->flow_ctrl = flow_ctrl_settings; | |
816 | rpn->xon_char = xon_char; | |
817 | rpn->xoff_char = xoff_char; | |
818 | rpn->param_mask = param_mask; | |
819 | ||
820 | *ptr = __fcs(buf); ptr++; | |
821 | ||
822 | return rfcomm_send_frame(s, buf, ptr - buf); | |
823 | } | |
824 | ||
825 | static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status) | |
826 | { | |
827 | struct rfcomm_hdr *hdr; | |
828 | struct rfcomm_mcc *mcc; | |
829 | struct rfcomm_rls *rls; | |
830 | u8 buf[16], *ptr = buf; | |
831 | ||
832 | BT_DBG("%p cr %d status 0x%x", s, cr, status); | |
833 | ||
834 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
835 | hdr->addr = __addr(s->initiator, 0); | |
836 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
837 | hdr->len = __len8(sizeof(*mcc) + sizeof(*rls)); | |
838 | ||
839 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
840 | mcc->type = __mcc_type(cr, RFCOMM_RLS); | |
841 | mcc->len = __len8(sizeof(*rls)); | |
842 | ||
843 | rls = (void *) ptr; ptr += sizeof(*rls); | |
844 | rls->dlci = __addr(1, dlci); | |
845 | rls->status = status; | |
846 | ||
847 | *ptr = __fcs(buf); ptr++; | |
848 | ||
849 | return rfcomm_send_frame(s, buf, ptr - buf); | |
850 | } | |
851 | ||
852 | static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig) | |
853 | { | |
854 | struct rfcomm_hdr *hdr; | |
855 | struct rfcomm_mcc *mcc; | |
856 | struct rfcomm_msc *msc; | |
857 | u8 buf[16], *ptr = buf; | |
858 | ||
859 | BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig); | |
860 | ||
861 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
862 | hdr->addr = __addr(s->initiator, 0); | |
863 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
864 | hdr->len = __len8(sizeof(*mcc) + sizeof(*msc)); | |
865 | ||
866 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
867 | mcc->type = __mcc_type(cr, RFCOMM_MSC); | |
868 | mcc->len = __len8(sizeof(*msc)); | |
869 | ||
870 | msc = (void *) ptr; ptr += sizeof(*msc); | |
871 | msc->dlci = __addr(1, dlci); | |
872 | msc->v24_sig = v24_sig | 0x01; | |
873 | ||
874 | *ptr = __fcs(buf); ptr++; | |
875 | ||
876 | return rfcomm_send_frame(s, buf, ptr - buf); | |
877 | } | |
878 | ||
879 | static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr) | |
880 | { | |
881 | struct rfcomm_hdr *hdr; | |
882 | struct rfcomm_mcc *mcc; | |
883 | u8 buf[16], *ptr = buf; | |
884 | ||
885 | BT_DBG("%p cr %d", s, cr); | |
886 | ||
887 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
888 | hdr->addr = __addr(s->initiator, 0); | |
889 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
890 | hdr->len = __len8(sizeof(*mcc)); | |
891 | ||
892 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
893 | mcc->type = __mcc_type(cr, RFCOMM_FCOFF); | |
894 | mcc->len = __len8(0); | |
895 | ||
896 | *ptr = __fcs(buf); ptr++; | |
897 | ||
898 | return rfcomm_send_frame(s, buf, ptr - buf); | |
899 | } | |
900 | ||
901 | static int rfcomm_send_fcon(struct rfcomm_session *s, int cr) | |
902 | { | |
903 | struct rfcomm_hdr *hdr; | |
904 | struct rfcomm_mcc *mcc; | |
905 | u8 buf[16], *ptr = buf; | |
906 | ||
907 | BT_DBG("%p cr %d", s, cr); | |
908 | ||
909 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
910 | hdr->addr = __addr(s->initiator, 0); | |
911 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
912 | hdr->len = __len8(sizeof(*mcc)); | |
913 | ||
914 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
915 | mcc->type = __mcc_type(cr, RFCOMM_FCON); | |
916 | mcc->len = __len8(0); | |
917 | ||
918 | *ptr = __fcs(buf); ptr++; | |
919 | ||
920 | return rfcomm_send_frame(s, buf, ptr - buf); | |
921 | } | |
922 | ||
923 | static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len) | |
924 | { | |
925 | struct socket *sock = s->sock; | |
926 | struct kvec iv[3]; | |
927 | struct msghdr msg; | |
928 | unsigned char hdr[5], crc[1]; | |
929 | ||
930 | if (len > 125) | |
931 | return -EINVAL; | |
932 | ||
933 | BT_DBG("%p cr %d", s, cr); | |
934 | ||
935 | hdr[0] = __addr(s->initiator, 0); | |
936 | hdr[1] = __ctrl(RFCOMM_UIH, 0); | |
937 | hdr[2] = 0x01 | ((len + 2) << 1); | |
938 | hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2); | |
939 | hdr[4] = 0x01 | (len << 1); | |
940 | ||
941 | crc[0] = __fcs(hdr); | |
942 | ||
943 | iv[0].iov_base = hdr; | |
944 | iv[0].iov_len = 5; | |
945 | iv[1].iov_base = pattern; | |
946 | iv[1].iov_len = len; | |
947 | iv[2].iov_base = crc; | |
948 | iv[2].iov_len = 1; | |
949 | ||
950 | memset(&msg, 0, sizeof(msg)); | |
951 | ||
952 | return kernel_sendmsg(sock, &msg, iv, 3, 6 + len); | |
953 | } | |
954 | ||
955 | static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits) | |
956 | { | |
957 | struct rfcomm_hdr *hdr; | |
958 | u8 buf[16], *ptr = buf; | |
959 | ||
960 | BT_DBG("%p addr %d credits %d", s, addr, credits); | |
961 | ||
962 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
963 | hdr->addr = addr; | |
964 | hdr->ctrl = __ctrl(RFCOMM_UIH, 1); | |
965 | hdr->len = __len8(0); | |
966 | ||
967 | *ptr = credits; ptr++; | |
968 | ||
969 | *ptr = __fcs(buf); ptr++; | |
970 | ||
971 | return rfcomm_send_frame(s, buf, ptr - buf); | |
972 | } | |
973 | ||
974 | static void rfcomm_make_uih(struct sk_buff *skb, u8 addr) | |
975 | { | |
976 | struct rfcomm_hdr *hdr; | |
977 | int len = skb->len; | |
978 | u8 *crc; | |
979 | ||
980 | if (len > 127) { | |
981 | hdr = (void *) skb_push(skb, 4); | |
982 | put_unaligned(htobs(__len16(len)), (u16 *) &hdr->len); | |
983 | } else { | |
984 | hdr = (void *) skb_push(skb, 3); | |
985 | hdr->len = __len8(len); | |
986 | } | |
987 | hdr->addr = addr; | |
988 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
989 | ||
990 | crc = skb_put(skb, 1); | |
991 | *crc = __fcs((void *) hdr); | |
992 | } | |
993 | ||
994 | /* ---- RFCOMM frame reception ---- */ | |
995 | static int rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci) | |
996 | { | |
997 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
998 | ||
999 | if (dlci) { | |
1000 | /* Data channel */ | |
1001 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); | |
1002 | if (!d) { | |
1003 | rfcomm_send_dm(s, dlci); | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | switch (d->state) { | |
1008 | case BT_CONNECT: | |
1009 | rfcomm_dlc_clear_timer(d); | |
1010 | ||
1011 | rfcomm_dlc_lock(d); | |
1012 | d->state = BT_CONNECTED; | |
1013 | d->state_change(d, 0); | |
1014 | rfcomm_dlc_unlock(d); | |
1015 | ||
1016 | rfcomm_send_msc(s, 1, dlci, d->v24_sig); | |
1017 | break; | |
1018 | ||
1019 | case BT_DISCONN: | |
1020 | d->state = BT_CLOSED; | |
1021 | __rfcomm_dlc_close(d, 0); | |
1022 | break; | |
1023 | } | |
1024 | } else { | |
1025 | /* Control channel */ | |
1026 | switch (s->state) { | |
1027 | case BT_CONNECT: | |
1028 | s->state = BT_CONNECTED; | |
1029 | rfcomm_process_connect(s); | |
1030 | break; | |
1031 | } | |
1032 | } | |
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | static int rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci) | |
1037 | { | |
1038 | int err = 0; | |
1039 | ||
1040 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1041 | ||
1042 | if (dlci) { | |
1043 | /* Data DLC */ | |
1044 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); | |
1045 | if (d) { | |
1046 | if (d->state == BT_CONNECT || d->state == BT_CONFIG) | |
1047 | err = ECONNREFUSED; | |
1048 | else | |
1049 | err = ECONNRESET; | |
1050 | ||
1051 | d->state = BT_CLOSED; | |
1052 | __rfcomm_dlc_close(d, err); | |
1053 | } | |
1054 | } else { | |
1055 | if (s->state == BT_CONNECT) | |
1056 | err = ECONNREFUSED; | |
1057 | else | |
1058 | err = ECONNRESET; | |
1059 | ||
1060 | s->state = BT_CLOSED; | |
1061 | rfcomm_session_close(s, err); | |
1062 | } | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci) | |
1067 | { | |
1068 | int err = 0; | |
1069 | ||
1070 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1071 | ||
1072 | if (dlci) { | |
1073 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); | |
1074 | if (d) { | |
1075 | rfcomm_send_ua(s, dlci); | |
1076 | ||
1077 | if (d->state == BT_CONNECT || d->state == BT_CONFIG) | |
1078 | err = ECONNREFUSED; | |
1079 | else | |
1080 | err = ECONNRESET; | |
1081 | ||
1082 | d->state = BT_CLOSED; | |
1083 | __rfcomm_dlc_close(d, err); | |
1084 | } else | |
1085 | rfcomm_send_dm(s, dlci); | |
1086 | ||
1087 | } else { | |
1088 | rfcomm_send_ua(s, 0); | |
1089 | ||
1090 | if (s->state == BT_CONNECT) | |
1091 | err = ECONNREFUSED; | |
1092 | else | |
1093 | err = ECONNRESET; | |
1094 | ||
1095 | s->state = BT_CLOSED; | |
1096 | rfcomm_session_close(s, err); | |
1097 | } | |
1098 | ||
1099 | return 0; | |
1100 | } | |
1101 | ||
1102 | static inline int rfcomm_check_link_mode(struct rfcomm_dlc *d) | |
1103 | { | |
1104 | struct sock *sk = d->session->sock->sk; | |
1105 | ||
1106 | if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) { | |
1107 | if (!hci_conn_encrypt(l2cap_pi(sk)->conn->hcon)) | |
1108 | return 1; | |
1109 | } else if (d->link_mode & RFCOMM_LM_AUTH) { | |
1110 | if (!hci_conn_auth(l2cap_pi(sk)->conn->hcon)) | |
1111 | return 1; | |
1112 | } | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | static void rfcomm_dlc_accept(struct rfcomm_dlc *d) | |
1118 | { | |
1119 | BT_DBG("dlc %p", d); | |
1120 | ||
1121 | rfcomm_send_ua(d->session, d->dlci); | |
1122 | ||
1123 | rfcomm_dlc_lock(d); | |
1124 | d->state = BT_CONNECTED; | |
1125 | d->state_change(d, 0); | |
1126 | rfcomm_dlc_unlock(d); | |
1127 | ||
1128 | rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); | |
1129 | } | |
1130 | ||
1131 | static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci) | |
1132 | { | |
1133 | struct rfcomm_dlc *d; | |
1134 | u8 channel; | |
1135 | ||
1136 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1137 | ||
1138 | if (!dlci) { | |
1139 | rfcomm_send_ua(s, 0); | |
1140 | ||
1141 | if (s->state == BT_OPEN) { | |
1142 | s->state = BT_CONNECTED; | |
1143 | rfcomm_process_connect(s); | |
1144 | } | |
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | /* Check if DLC exists */ | |
1149 | d = rfcomm_dlc_get(s, dlci); | |
1150 | if (d) { | |
1151 | if (d->state == BT_OPEN) { | |
1152 | /* DLC was previously opened by PN request */ | |
1153 | if (rfcomm_check_link_mode(d)) { | |
1154 | set_bit(RFCOMM_AUTH_PENDING, &d->flags); | |
1155 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); | |
1156 | return 0; | |
1157 | } | |
1158 | ||
1159 | rfcomm_dlc_accept(d); | |
1160 | } | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | /* Notify socket layer about incoming connection */ | |
1165 | channel = __srv_channel(dlci); | |
1166 | if (rfcomm_connect_ind(s, channel, &d)) { | |
1167 | d->dlci = dlci; | |
1168 | d->addr = __addr(s->initiator, dlci); | |
1169 | rfcomm_dlc_link(s, d); | |
1170 | ||
1171 | if (rfcomm_check_link_mode(d)) { | |
1172 | set_bit(RFCOMM_AUTH_PENDING, &d->flags); | |
1173 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); | |
1174 | return 0; | |
1175 | } | |
1176 | ||
1177 | rfcomm_dlc_accept(d); | |
1178 | } else { | |
1179 | rfcomm_send_dm(s, dlci); | |
1180 | } | |
1181 | ||
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn) | |
1186 | { | |
1187 | struct rfcomm_session *s = d->session; | |
1188 | ||
1189 | BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d", | |
1190 | d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits); | |
1191 | ||
1192 | if (pn->flow_ctrl == 0xf0 || pn->flow_ctrl == 0xe0) { | |
1193 | d->cfc = s->cfc = RFCOMM_CFC_ENABLED; | |
1194 | d->tx_credits = pn->credits; | |
1195 | } else { | |
1196 | d->cfc = s->cfc = RFCOMM_CFC_DISABLED; | |
1197 | set_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1198 | } | |
1199 | ||
1200 | d->priority = pn->priority; | |
1201 | ||
1202 | d->mtu = s->mtu = btohs(pn->mtu); | |
1203 | ||
1204 | return 0; | |
1205 | } | |
1206 | ||
1207 | static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb) | |
1208 | { | |
1209 | struct rfcomm_pn *pn = (void *) skb->data; | |
1210 | struct rfcomm_dlc *d; | |
1211 | u8 dlci = pn->dlci; | |
1212 | ||
1213 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1214 | ||
1215 | if (!dlci) | |
1216 | return 0; | |
1217 | ||
1218 | d = rfcomm_dlc_get(s, dlci); | |
1219 | if (d) { | |
1220 | if (cr) { | |
1221 | /* PN request */ | |
1222 | rfcomm_apply_pn(d, cr, pn); | |
1223 | rfcomm_send_pn(s, 0, d); | |
1224 | } else { | |
1225 | /* PN response */ | |
1226 | switch (d->state) { | |
1227 | case BT_CONFIG: | |
1228 | rfcomm_apply_pn(d, cr, pn); | |
1229 | ||
1230 | d->state = BT_CONNECT; | |
1231 | rfcomm_send_sabm(s, d->dlci); | |
1232 | break; | |
1233 | } | |
1234 | } | |
1235 | } else { | |
1236 | u8 channel = __srv_channel(dlci); | |
1237 | ||
1238 | if (!cr) | |
1239 | return 0; | |
1240 | ||
1241 | /* PN request for non existing DLC. | |
1242 | * Assume incoming connection. */ | |
1243 | if (rfcomm_connect_ind(s, channel, &d)) { | |
1244 | d->dlci = dlci; | |
1245 | d->addr = __addr(s->initiator, dlci); | |
1246 | rfcomm_dlc_link(s, d); | |
1247 | ||
1248 | rfcomm_apply_pn(d, cr, pn); | |
1249 | ||
1250 | d->state = BT_OPEN; | |
1251 | rfcomm_send_pn(s, 0, d); | |
1252 | } else { | |
1253 | rfcomm_send_dm(s, dlci); | |
1254 | } | |
1255 | } | |
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb) | |
1260 | { | |
1261 | struct rfcomm_rpn *rpn = (void *) skb->data; | |
1262 | u8 dlci = __get_dlci(rpn->dlci); | |
1263 | ||
1264 | u8 bit_rate = 0; | |
1265 | u8 data_bits = 0; | |
1266 | u8 stop_bits = 0; | |
1267 | u8 parity = 0; | |
1268 | u8 flow_ctrl = 0; | |
1269 | u8 xon_char = 0; | |
1270 | u8 xoff_char = 0; | |
1271 | u16 rpn_mask = RFCOMM_RPN_PM_ALL; | |
1272 | ||
1273 | 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", | |
1274 | dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl, | |
1275 | rpn->xon_char, rpn->xoff_char, rpn->param_mask); | |
1276 | ||
1277 | if (!cr) | |
1278 | return 0; | |
1279 | ||
1280 | if (len == 1) { | |
1281 | /* request: return default setting */ | |
1282 | bit_rate = RFCOMM_RPN_BR_115200; | |
1283 | data_bits = RFCOMM_RPN_DATA_8; | |
1284 | stop_bits = RFCOMM_RPN_STOP_1; | |
1285 | parity = RFCOMM_RPN_PARITY_NONE; | |
1286 | flow_ctrl = RFCOMM_RPN_FLOW_NONE; | |
1287 | xon_char = RFCOMM_RPN_XON_CHAR; | |
1288 | xoff_char = RFCOMM_RPN_XOFF_CHAR; | |
1289 | ||
1290 | goto rpn_out; | |
1291 | } | |
1292 | /* check for sane values: ignore/accept bit_rate, 8 bits, 1 stop bit, no parity, | |
1293 | no flow control lines, normal XON/XOFF chars */ | |
1294 | if (rpn->param_mask & RFCOMM_RPN_PM_BITRATE) { | |
1295 | bit_rate = rpn->bit_rate; | |
1296 | if (bit_rate != RFCOMM_RPN_BR_115200) { | |
1297 | BT_DBG("RPN bit rate mismatch 0x%x", bit_rate); | |
1298 | bit_rate = RFCOMM_RPN_BR_115200; | |
1299 | rpn_mask ^= RFCOMM_RPN_PM_BITRATE; | |
1300 | } | |
1301 | } | |
1302 | if (rpn->param_mask & RFCOMM_RPN_PM_DATA) { | |
1303 | data_bits = __get_rpn_data_bits(rpn->line_settings); | |
1304 | if (data_bits != RFCOMM_RPN_DATA_8) { | |
1305 | BT_DBG("RPN data bits mismatch 0x%x", data_bits); | |
1306 | data_bits = RFCOMM_RPN_DATA_8; | |
1307 | rpn_mask ^= RFCOMM_RPN_PM_DATA; | |
1308 | } | |
1309 | } | |
1310 | if (rpn->param_mask & RFCOMM_RPN_PM_STOP) { | |
1311 | stop_bits = __get_rpn_stop_bits(rpn->line_settings); | |
1312 | if (stop_bits != RFCOMM_RPN_STOP_1) { | |
1313 | BT_DBG("RPN stop bits mismatch 0x%x", stop_bits); | |
1314 | stop_bits = RFCOMM_RPN_STOP_1; | |
1315 | rpn_mask ^= RFCOMM_RPN_PM_STOP; | |
1316 | } | |
1317 | } | |
1318 | if (rpn->param_mask & RFCOMM_RPN_PM_PARITY) { | |
1319 | parity = __get_rpn_parity(rpn->line_settings); | |
1320 | if (parity != RFCOMM_RPN_PARITY_NONE) { | |
1321 | BT_DBG("RPN parity mismatch 0x%x", parity); | |
1322 | parity = RFCOMM_RPN_PARITY_NONE; | |
1323 | rpn_mask ^= RFCOMM_RPN_PM_PARITY; | |
1324 | } | |
1325 | } | |
1326 | if (rpn->param_mask & RFCOMM_RPN_PM_FLOW) { | |
1327 | flow_ctrl = rpn->flow_ctrl; | |
1328 | if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) { | |
1329 | BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl); | |
1330 | flow_ctrl = RFCOMM_RPN_FLOW_NONE; | |
1331 | rpn_mask ^= RFCOMM_RPN_PM_FLOW; | |
1332 | } | |
1333 | } | |
1334 | if (rpn->param_mask & RFCOMM_RPN_PM_XON) { | |
1335 | xon_char = rpn->xon_char; | |
1336 | if (xon_char != RFCOMM_RPN_XON_CHAR) { | |
1337 | BT_DBG("RPN XON char mismatch 0x%x", xon_char); | |
1338 | xon_char = RFCOMM_RPN_XON_CHAR; | |
1339 | rpn_mask ^= RFCOMM_RPN_PM_XON; | |
1340 | } | |
1341 | } | |
1342 | if (rpn->param_mask & RFCOMM_RPN_PM_XOFF) { | |
1343 | xoff_char = rpn->xoff_char; | |
1344 | if (xoff_char != RFCOMM_RPN_XOFF_CHAR) { | |
1345 | BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char); | |
1346 | xoff_char = RFCOMM_RPN_XOFF_CHAR; | |
1347 | rpn_mask ^= RFCOMM_RPN_PM_XOFF; | |
1348 | } | |
1349 | } | |
1350 | ||
1351 | rpn_out: | |
1352 | rfcomm_send_rpn(s, 0, dlci, | |
1353 | bit_rate, data_bits, stop_bits, parity, flow_ctrl, | |
1354 | xon_char, xoff_char, rpn_mask); | |
1355 | ||
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb) | |
1360 | { | |
1361 | struct rfcomm_rls *rls = (void *) skb->data; | |
1362 | u8 dlci = __get_dlci(rls->dlci); | |
1363 | ||
1364 | BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status); | |
1365 | ||
1366 | if (!cr) | |
1367 | return 0; | |
1368 | ||
1369 | /* FIXME: We should probably do something with this | |
1370 | information here. But for now it's sufficient just | |
1371 | to reply -- Bluetooth 1.1 says it's mandatory to | |
1372 | recognise and respond to RLS */ | |
1373 | ||
1374 | rfcomm_send_rls(s, 0, dlci, rls->status); | |
1375 | ||
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb) | |
1380 | { | |
1381 | struct rfcomm_msc *msc = (void *) skb->data; | |
1382 | struct rfcomm_dlc *d; | |
1383 | u8 dlci = __get_dlci(msc->dlci); | |
1384 | ||
1385 | BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig); | |
1386 | ||
1387 | d = rfcomm_dlc_get(s, dlci); | |
1388 | if (!d) | |
1389 | return 0; | |
1390 | ||
1391 | if (cr) { | |
1392 | if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc) | |
1393 | set_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1394 | else | |
1395 | clear_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1396 | ||
1397 | rfcomm_dlc_lock(d); | |
1398 | if (d->modem_status) | |
1399 | d->modem_status(d, msc->v24_sig); | |
1400 | rfcomm_dlc_unlock(d); | |
1401 | ||
1402 | rfcomm_send_msc(s, 0, dlci, msc->v24_sig); | |
1403 | ||
1404 | d->mscex |= RFCOMM_MSCEX_RX; | |
1405 | } else | |
1406 | d->mscex |= RFCOMM_MSCEX_TX; | |
1407 | ||
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb) | |
1412 | { | |
1413 | struct rfcomm_mcc *mcc = (void *) skb->data; | |
1414 | u8 type, cr, len; | |
1415 | ||
1416 | cr = __test_cr(mcc->type); | |
1417 | type = __get_mcc_type(mcc->type); | |
1418 | len = __get_mcc_len(mcc->len); | |
1419 | ||
1420 | BT_DBG("%p type 0x%x cr %d", s, type, cr); | |
1421 | ||
1422 | skb_pull(skb, 2); | |
1423 | ||
1424 | switch (type) { | |
1425 | case RFCOMM_PN: | |
1426 | rfcomm_recv_pn(s, cr, skb); | |
1427 | break; | |
1428 | ||
1429 | case RFCOMM_RPN: | |
1430 | rfcomm_recv_rpn(s, cr, len, skb); | |
1431 | break; | |
1432 | ||
1433 | case RFCOMM_RLS: | |
1434 | rfcomm_recv_rls(s, cr, skb); | |
1435 | break; | |
1436 | ||
1437 | case RFCOMM_MSC: | |
1438 | rfcomm_recv_msc(s, cr, skb); | |
1439 | break; | |
1440 | ||
1441 | case RFCOMM_FCOFF: | |
1442 | if (cr) { | |
1443 | set_bit(RFCOMM_TX_THROTTLED, &s->flags); | |
1444 | rfcomm_send_fcoff(s, 0); | |
1445 | } | |
1446 | break; | |
1447 | ||
1448 | case RFCOMM_FCON: | |
1449 | if (cr) { | |
1450 | clear_bit(RFCOMM_TX_THROTTLED, &s->flags); | |
1451 | rfcomm_send_fcon(s, 0); | |
1452 | } | |
1453 | break; | |
1454 | ||
1455 | case RFCOMM_TEST: | |
1456 | if (cr) | |
1457 | rfcomm_send_test(s, 0, skb->data, skb->len); | |
1458 | break; | |
1459 | ||
1460 | case RFCOMM_NSC: | |
1461 | break; | |
1462 | ||
1463 | default: | |
1464 | BT_ERR("Unknown control type 0x%02x", type); | |
1465 | rfcomm_send_nsc(s, cr, type); | |
1466 | break; | |
1467 | } | |
1468 | return 0; | |
1469 | } | |
1470 | ||
1471 | static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb) | |
1472 | { | |
1473 | struct rfcomm_dlc *d; | |
1474 | ||
1475 | BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf); | |
1476 | ||
1477 | d = rfcomm_dlc_get(s, dlci); | |
1478 | if (!d) { | |
1479 | rfcomm_send_dm(s, dlci); | |
1480 | goto drop; | |
1481 | } | |
1482 | ||
1483 | if (pf && d->cfc) { | |
1484 | u8 credits = *(u8 *) skb->data; skb_pull(skb, 1); | |
1485 | ||
1486 | d->tx_credits += credits; | |
1487 | if (d->tx_credits) | |
1488 | clear_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1489 | } | |
1490 | ||
1491 | if (skb->len && d->state == BT_CONNECTED) { | |
1492 | rfcomm_dlc_lock(d); | |
1493 | d->rx_credits--; | |
1494 | d->data_ready(d, skb); | |
1495 | rfcomm_dlc_unlock(d); | |
1496 | return 0; | |
1497 | } | |
1498 | ||
1499 | drop: | |
1500 | kfree_skb(skb); | |
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb) | |
1505 | { | |
1506 | struct rfcomm_hdr *hdr = (void *) skb->data; | |
1507 | u8 type, dlci, fcs; | |
1508 | ||
1509 | dlci = __get_dlci(hdr->addr); | |
1510 | type = __get_type(hdr->ctrl); | |
1511 | ||
1512 | /* Trim FCS */ | |
1513 | skb->len--; skb->tail--; | |
1514 | fcs = *(u8 *) skb->tail; | |
1515 | ||
1516 | if (__check_fcs(skb->data, type, fcs)) { | |
1517 | BT_ERR("bad checksum in packet"); | |
1518 | kfree_skb(skb); | |
1519 | return -EILSEQ; | |
1520 | } | |
1521 | ||
1522 | if (__test_ea(hdr->len)) | |
1523 | skb_pull(skb, 3); | |
1524 | else | |
1525 | skb_pull(skb, 4); | |
1526 | ||
1527 | switch (type) { | |
1528 | case RFCOMM_SABM: | |
1529 | if (__test_pf(hdr->ctrl)) | |
1530 | rfcomm_recv_sabm(s, dlci); | |
1531 | break; | |
1532 | ||
1533 | case RFCOMM_DISC: | |
1534 | if (__test_pf(hdr->ctrl)) | |
1535 | rfcomm_recv_disc(s, dlci); | |
1536 | break; | |
1537 | ||
1538 | case RFCOMM_UA: | |
1539 | if (__test_pf(hdr->ctrl)) | |
1540 | rfcomm_recv_ua(s, dlci); | |
1541 | break; | |
1542 | ||
1543 | case RFCOMM_DM: | |
1544 | rfcomm_recv_dm(s, dlci); | |
1545 | break; | |
1546 | ||
1547 | case RFCOMM_UIH: | |
1548 | if (dlci) | |
1549 | return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb); | |
1550 | ||
1551 | rfcomm_recv_mcc(s, skb); | |
1552 | break; | |
1553 | ||
1554 | default: | |
1555 | BT_ERR("Unknown packet type 0x%02x\n", type); | |
1556 | break; | |
1557 | } | |
1558 | kfree_skb(skb); | |
1559 | return 0; | |
1560 | } | |
1561 | ||
1562 | /* ---- Connection and data processing ---- */ | |
1563 | ||
1564 | static void rfcomm_process_connect(struct rfcomm_session *s) | |
1565 | { | |
1566 | struct rfcomm_dlc *d; | |
1567 | struct list_head *p, *n; | |
1568 | ||
1569 | BT_DBG("session %p state %ld", s, s->state); | |
1570 | ||
1571 | list_for_each_safe(p, n, &s->dlcs) { | |
1572 | d = list_entry(p, struct rfcomm_dlc, list); | |
1573 | if (d->state == BT_CONFIG) { | |
1574 | d->mtu = s->mtu; | |
1575 | rfcomm_send_pn(s, 1, d); | |
1576 | } | |
1577 | } | |
1578 | } | |
1579 | ||
1580 | /* Send data queued for the DLC. | |
1581 | * Return number of frames left in the queue. | |
1582 | */ | |
1583 | static inline int rfcomm_process_tx(struct rfcomm_dlc *d) | |
1584 | { | |
1585 | struct sk_buff *skb; | |
1586 | int err; | |
1587 | ||
1588 | BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d", | |
1589 | d, d->state, d->cfc, d->rx_credits, d->tx_credits); | |
1590 | ||
1591 | /* Send pending MSC */ | |
1592 | if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags)) | |
1593 | rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); | |
1594 | ||
1595 | if (d->cfc) { | |
1596 | /* CFC enabled. | |
1597 | * Give them some credits */ | |
1598 | if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) && | |
1599 | d->rx_credits <= (d->cfc >> 2)) { | |
1600 | rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits); | |
1601 | d->rx_credits = d->cfc; | |
1602 | } | |
1603 | } else { | |
1604 | /* CFC disabled. | |
1605 | * Give ourselves some credits */ | |
1606 | d->tx_credits = 5; | |
1607 | } | |
1608 | ||
1609 | if (test_bit(RFCOMM_TX_THROTTLED, &d->flags)) | |
1610 | return skb_queue_len(&d->tx_queue); | |
1611 | ||
1612 | while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) { | |
1613 | err = rfcomm_send_frame(d->session, skb->data, skb->len); | |
1614 | if (err < 0) { | |
1615 | skb_queue_head(&d->tx_queue, skb); | |
1616 | break; | |
1617 | } | |
1618 | kfree_skb(skb); | |
1619 | d->tx_credits--; | |
1620 | } | |
1621 | ||
1622 | if (d->cfc && !d->tx_credits) { | |
1623 | /* We're out of TX credits. | |
1624 | * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */ | |
1625 | set_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1626 | } | |
1627 | ||
1628 | return skb_queue_len(&d->tx_queue); | |
1629 | } | |
1630 | ||
1631 | static inline void rfcomm_process_dlcs(struct rfcomm_session *s) | |
1632 | { | |
1633 | struct rfcomm_dlc *d; | |
1634 | struct list_head *p, *n; | |
1635 | ||
1636 | BT_DBG("session %p state %ld", s, s->state); | |
1637 | ||
1638 | list_for_each_safe(p, n, &s->dlcs) { | |
1639 | d = list_entry(p, struct rfcomm_dlc, list); | |
1640 | ||
1641 | if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) { | |
1642 | __rfcomm_dlc_close(d, ETIMEDOUT); | |
1643 | continue; | |
1644 | } | |
1645 | ||
1646 | if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) { | |
1647 | rfcomm_dlc_clear_timer(d); | |
1648 | rfcomm_dlc_accept(d); | |
1649 | if (d->link_mode & RFCOMM_LM_SECURE) { | |
1650 | struct sock *sk = s->sock->sk; | |
1651 | hci_conn_change_link_key(l2cap_pi(sk)->conn->hcon); | |
1652 | } | |
1653 | continue; | |
1654 | } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) { | |
1655 | rfcomm_dlc_clear_timer(d); | |
1656 | rfcomm_send_dm(s, d->dlci); | |
1657 | __rfcomm_dlc_close(d, ECONNREFUSED); | |
1658 | continue; | |
1659 | } | |
1660 | ||
1661 | if (test_bit(RFCOMM_TX_THROTTLED, &s->flags)) | |
1662 | continue; | |
1663 | ||
1664 | if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) && | |
1665 | d->mscex == RFCOMM_MSCEX_OK) | |
1666 | rfcomm_process_tx(d); | |
1667 | } | |
1668 | } | |
1669 | ||
1670 | static inline void rfcomm_process_rx(struct rfcomm_session *s) | |
1671 | { | |
1672 | struct socket *sock = s->sock; | |
1673 | struct sock *sk = sock->sk; | |
1674 | struct sk_buff *skb; | |
1675 | ||
1676 | BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue)); | |
1677 | ||
1678 | /* Get data directly from socket receive queue without copying it. */ | |
1679 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) { | |
1680 | skb_orphan(skb); | |
1681 | rfcomm_recv_frame(s, skb); | |
1682 | } | |
1683 | ||
1684 | if (sk->sk_state == BT_CLOSED) { | |
1685 | if (!s->initiator) | |
1686 | rfcomm_session_put(s); | |
1687 | ||
1688 | rfcomm_session_close(s, sk->sk_err); | |
1689 | } | |
1690 | } | |
1691 | ||
1692 | static inline void rfcomm_accept_connection(struct rfcomm_session *s) | |
1693 | { | |
1694 | struct socket *sock = s->sock, *nsock; | |
1695 | int err; | |
1696 | ||
1697 | /* Fast check for a new connection. | |
1698 | * Avoids unnesesary socket allocations. */ | |
1699 | if (list_empty(&bt_sk(sock->sk)->accept_q)) | |
1700 | return; | |
1701 | ||
1702 | BT_DBG("session %p", s); | |
1703 | ||
1704 | if (sock_create_lite(PF_BLUETOOTH, sock->type, BTPROTO_L2CAP, &nsock)) | |
1705 | return; | |
1706 | ||
1707 | nsock->ops = sock->ops; | |
1708 | ||
1709 | __module_get(nsock->ops->owner); | |
1710 | ||
1711 | err = sock->ops->accept(sock, nsock, O_NONBLOCK); | |
1712 | if (err < 0) { | |
1713 | sock_release(nsock); | |
1714 | return; | |
1715 | } | |
1716 | ||
1717 | /* Set our callbacks */ | |
1718 | nsock->sk->sk_data_ready = rfcomm_l2data_ready; | |
1719 | nsock->sk->sk_state_change = rfcomm_l2state_change; | |
1720 | ||
1721 | s = rfcomm_session_add(nsock, BT_OPEN); | |
1722 | if (s) { | |
1723 | rfcomm_session_hold(s); | |
1724 | rfcomm_schedule(RFCOMM_SCHED_RX); | |
1725 | } else | |
1726 | sock_release(nsock); | |
1727 | } | |
1728 | ||
1729 | static inline void rfcomm_check_connection(struct rfcomm_session *s) | |
1730 | { | |
1731 | struct sock *sk = s->sock->sk; | |
1732 | ||
1733 | BT_DBG("%p state %ld", s, s->state); | |
1734 | ||
1735 | switch(sk->sk_state) { | |
1736 | case BT_CONNECTED: | |
1737 | s->state = BT_CONNECT; | |
1738 | ||
1739 | /* We can adjust MTU on outgoing sessions. | |
1740 | * L2CAP MTU minus UIH header and FCS. */ | |
1741 | s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5; | |
1742 | ||
1743 | rfcomm_send_sabm(s, 0); | |
1744 | break; | |
1745 | ||
1746 | case BT_CLOSED: | |
1747 | s->state = BT_CLOSED; | |
1748 | rfcomm_session_close(s, sk->sk_err); | |
1749 | break; | |
1750 | } | |
1751 | } | |
1752 | ||
1753 | static inline void rfcomm_process_sessions(void) | |
1754 | { | |
1755 | struct list_head *p, *n; | |
1756 | ||
1757 | rfcomm_lock(); | |
1758 | ||
1759 | list_for_each_safe(p, n, &session_list) { | |
1760 | struct rfcomm_session *s; | |
1761 | s = list_entry(p, struct rfcomm_session, list); | |
1762 | ||
1763 | if (s->state == BT_LISTEN) { | |
1764 | rfcomm_accept_connection(s); | |
1765 | continue; | |
1766 | } | |
1767 | ||
1768 | rfcomm_session_hold(s); | |
1769 | ||
1770 | switch (s->state) { | |
1771 | case BT_BOUND: | |
1772 | rfcomm_check_connection(s); | |
1773 | break; | |
1774 | ||
1775 | default: | |
1776 | rfcomm_process_rx(s); | |
1777 | break; | |
1778 | } | |
1779 | ||
1780 | rfcomm_process_dlcs(s); | |
1781 | ||
1782 | rfcomm_session_put(s); | |
1783 | } | |
1784 | ||
1785 | rfcomm_unlock(); | |
1786 | } | |
1787 | ||
1788 | static void rfcomm_worker(void) | |
1789 | { | |
1790 | BT_DBG(""); | |
1791 | ||
1792 | while (!atomic_read(&terminate)) { | |
1793 | if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) { | |
1794 | /* No pending events. Let's sleep. | |
1795 | * Incoming connections and data will wake us up. */ | |
1796 | set_current_state(TASK_INTERRUPTIBLE); | |
1797 | schedule(); | |
1798 | } | |
1799 | ||
1800 | /* Process stuff */ | |
1801 | clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event); | |
1802 | rfcomm_process_sessions(); | |
1803 | } | |
1804 | set_current_state(TASK_RUNNING); | |
1805 | return; | |
1806 | } | |
1807 | ||
1808 | static int rfcomm_add_listener(bdaddr_t *ba) | |
1809 | { | |
1810 | struct sockaddr_l2 addr; | |
1811 | struct socket *sock; | |
1812 | struct sock *sk; | |
1813 | struct rfcomm_session *s; | |
1814 | int err = 0; | |
1815 | ||
1816 | /* Create socket */ | |
1817 | err = rfcomm_l2sock_create(&sock); | |
1818 | if (err < 0) { | |
1819 | BT_ERR("Create socket failed %d", err); | |
1820 | return err; | |
1821 | } | |
1822 | ||
1823 | /* Bind socket */ | |
1824 | bacpy(&addr.l2_bdaddr, ba); | |
1825 | addr.l2_family = AF_BLUETOOTH; | |
1826 | addr.l2_psm = htobs(RFCOMM_PSM); | |
1827 | err = sock->ops->bind(sock, (struct sockaddr *) &addr, sizeof(addr)); | |
1828 | if (err < 0) { | |
1829 | BT_ERR("Bind failed %d", err); | |
1830 | goto failed; | |
1831 | } | |
1832 | ||
1833 | /* Set L2CAP options */ | |
1834 | sk = sock->sk; | |
1835 | lock_sock(sk); | |
1836 | l2cap_pi(sk)->imtu = RFCOMM_MAX_L2CAP_MTU; | |
1837 | release_sock(sk); | |
1838 | ||
1839 | /* Start listening on the socket */ | |
1840 | err = sock->ops->listen(sock, 10); | |
1841 | if (err) { | |
1842 | BT_ERR("Listen failed %d", err); | |
1843 | goto failed; | |
1844 | } | |
1845 | ||
1846 | /* Add listening session */ | |
1847 | s = rfcomm_session_add(sock, BT_LISTEN); | |
1848 | if (!s) | |
1849 | goto failed; | |
1850 | ||
1851 | rfcomm_session_hold(s); | |
1852 | return 0; | |
1853 | failed: | |
1854 | sock_release(sock); | |
1855 | return err; | |
1856 | } | |
1857 | ||
1858 | static void rfcomm_kill_listener(void) | |
1859 | { | |
1860 | struct rfcomm_session *s; | |
1861 | struct list_head *p, *n; | |
1862 | ||
1863 | BT_DBG(""); | |
1864 | ||
1865 | list_for_each_safe(p, n, &session_list) { | |
1866 | s = list_entry(p, struct rfcomm_session, list); | |
1867 | rfcomm_session_del(s); | |
1868 | } | |
1869 | } | |
1870 | ||
1871 | static int rfcomm_run(void *unused) | |
1872 | { | |
1873 | rfcomm_thread = current; | |
1874 | ||
1875 | atomic_inc(&running); | |
1876 | ||
1877 | daemonize("krfcommd"); | |
1878 | set_user_nice(current, -10); | |
1879 | current->flags |= PF_NOFREEZE; | |
1880 | ||
1881 | BT_DBG(""); | |
1882 | ||
1883 | rfcomm_add_listener(BDADDR_ANY); | |
1884 | ||
1885 | rfcomm_worker(); | |
1886 | ||
1887 | rfcomm_kill_listener(); | |
1888 | ||
1889 | atomic_dec(&running); | |
1890 | return 0; | |
1891 | } | |
1892 | ||
1893 | static void rfcomm_auth_cfm(struct hci_conn *conn, u8 status) | |
1894 | { | |
1895 | struct rfcomm_session *s; | |
1896 | struct rfcomm_dlc *d; | |
1897 | struct list_head *p, *n; | |
1898 | ||
1899 | BT_DBG("conn %p status 0x%02x", conn, status); | |
1900 | ||
1901 | s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst); | |
1902 | if (!s) | |
1903 | return; | |
1904 | ||
1905 | rfcomm_session_hold(s); | |
1906 | ||
1907 | list_for_each_safe(p, n, &s->dlcs) { | |
1908 | d = list_entry(p, struct rfcomm_dlc, list); | |
1909 | ||
1910 | if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) | |
1911 | continue; | |
1912 | ||
1913 | if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags)) | |
1914 | continue; | |
1915 | ||
1916 | if (!status) | |
1917 | set_bit(RFCOMM_AUTH_ACCEPT, &d->flags); | |
1918 | else | |
1919 | set_bit(RFCOMM_AUTH_REJECT, &d->flags); | |
1920 | } | |
1921 | ||
1922 | rfcomm_session_put(s); | |
1923 | ||
1924 | rfcomm_schedule(RFCOMM_SCHED_AUTH); | |
1925 | } | |
1926 | ||
1927 | static void rfcomm_encrypt_cfm(struct hci_conn *conn, u8 status, u8 encrypt) | |
1928 | { | |
1929 | struct rfcomm_session *s; | |
1930 | struct rfcomm_dlc *d; | |
1931 | struct list_head *p, *n; | |
1932 | ||
1933 | BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt); | |
1934 | ||
1935 | s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst); | |
1936 | if (!s) | |
1937 | return; | |
1938 | ||
1939 | rfcomm_session_hold(s); | |
1940 | ||
1941 | list_for_each_safe(p, n, &s->dlcs) { | |
1942 | d = list_entry(p, struct rfcomm_dlc, list); | |
1943 | ||
1944 | if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags)) | |
1945 | continue; | |
1946 | ||
1947 | if (!status && encrypt) | |
1948 | set_bit(RFCOMM_AUTH_ACCEPT, &d->flags); | |
1949 | else | |
1950 | set_bit(RFCOMM_AUTH_REJECT, &d->flags); | |
1951 | } | |
1952 | ||
1953 | rfcomm_session_put(s); | |
1954 | ||
1955 | rfcomm_schedule(RFCOMM_SCHED_AUTH); | |
1956 | } | |
1957 | ||
1958 | static struct hci_cb rfcomm_cb = { | |
1959 | .name = "RFCOMM", | |
1960 | .auth_cfm = rfcomm_auth_cfm, | |
1961 | .encrypt_cfm = rfcomm_encrypt_cfm | |
1962 | }; | |
1963 | ||
1964 | /* ---- Proc fs support ---- */ | |
1965 | #ifdef CONFIG_PROC_FS | |
1966 | static void *rfcomm_seq_start(struct seq_file *seq, loff_t *pos) | |
1967 | { | |
1968 | struct rfcomm_session *s; | |
1969 | struct list_head *pp, *p; | |
1970 | loff_t l = *pos; | |
1971 | ||
1972 | rfcomm_lock(); | |
1973 | ||
1974 | list_for_each(p, &session_list) { | |
1975 | s = list_entry(p, struct rfcomm_session, list); | |
1976 | list_for_each(pp, &s->dlcs) | |
1977 | if (!l--) { | |
1978 | seq->private = s; | |
1979 | return pp; | |
1980 | } | |
1981 | } | |
1982 | return NULL; | |
1983 | } | |
1984 | ||
1985 | static void *rfcomm_seq_next(struct seq_file *seq, void *e, loff_t *pos) | |
1986 | { | |
1987 | struct rfcomm_session *s = seq->private; | |
1988 | struct list_head *pp, *p = e; | |
1989 | (*pos)++; | |
1990 | ||
1991 | if (p->next != &s->dlcs) | |
1992 | return p->next; | |
1993 | ||
1994 | list_for_each(p, &session_list) { | |
1995 | s = list_entry(p, struct rfcomm_session, list); | |
1996 | __list_for_each(pp, &s->dlcs) { | |
1997 | seq->private = s; | |
1998 | return pp; | |
1999 | } | |
2000 | } | |
2001 | return NULL; | |
2002 | } | |
2003 | ||
2004 | static void rfcomm_seq_stop(struct seq_file *seq, void *e) | |
2005 | { | |
2006 | rfcomm_unlock(); | |
2007 | } | |
2008 | ||
2009 | static int rfcomm_seq_show(struct seq_file *seq, void *e) | |
2010 | { | |
2011 | struct rfcomm_session *s = seq->private; | |
2012 | struct sock *sk = s->sock->sk; | |
2013 | struct rfcomm_dlc *d = list_entry(e, struct rfcomm_dlc, list); | |
2014 | ||
2015 | seq_printf(seq, "%s %s %ld %d %d %d %d\n", | |
2016 | batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), | |
2017 | d->state, d->dlci, d->mtu, d->rx_credits, d->tx_credits); | |
2018 | return 0; | |
2019 | } | |
2020 | ||
2021 | static struct seq_operations rfcomm_seq_ops = { | |
2022 | .start = rfcomm_seq_start, | |
2023 | .next = rfcomm_seq_next, | |
2024 | .stop = rfcomm_seq_stop, | |
2025 | .show = rfcomm_seq_show | |
2026 | }; | |
2027 | ||
2028 | static int rfcomm_seq_open(struct inode *inode, struct file *file) | |
2029 | { | |
2030 | return seq_open(file, &rfcomm_seq_ops); | |
2031 | } | |
2032 | ||
2033 | static struct file_operations rfcomm_seq_fops = { | |
2034 | .owner = THIS_MODULE, | |
2035 | .open = rfcomm_seq_open, | |
2036 | .read = seq_read, | |
2037 | .llseek = seq_lseek, | |
2038 | .release = seq_release, | |
2039 | }; | |
2040 | ||
2041 | static int __init rfcomm_proc_init(void) | |
2042 | { | |
2043 | struct proc_dir_entry *p; | |
2044 | ||
2045 | proc_bt_rfcomm = proc_mkdir("rfcomm", proc_bt); | |
2046 | if (proc_bt_rfcomm) { | |
2047 | proc_bt_rfcomm->owner = THIS_MODULE; | |
2048 | ||
2049 | p = create_proc_entry("dlc", S_IRUGO, proc_bt_rfcomm); | |
2050 | if (p) | |
2051 | p->proc_fops = &rfcomm_seq_fops; | |
2052 | } | |
2053 | return 0; | |
2054 | } | |
2055 | ||
2056 | static void __exit rfcomm_proc_cleanup(void) | |
2057 | { | |
2058 | remove_proc_entry("dlc", proc_bt_rfcomm); | |
2059 | ||
2060 | remove_proc_entry("rfcomm", proc_bt); | |
2061 | } | |
2062 | ||
2063 | #else /* CONFIG_PROC_FS */ | |
2064 | ||
2065 | static int __init rfcomm_proc_init(void) | |
2066 | { | |
2067 | return 0; | |
2068 | } | |
2069 | ||
2070 | static void __exit rfcomm_proc_cleanup(void) | |
2071 | { | |
2072 | return; | |
2073 | } | |
2074 | #endif /* CONFIG_PROC_FS */ | |
2075 | ||
2076 | /* ---- Initialization ---- */ | |
2077 | static int __init rfcomm_init(void) | |
2078 | { | |
2079 | l2cap_load(); | |
2080 | ||
2081 | hci_register_cb(&rfcomm_cb); | |
2082 | ||
2083 | kernel_thread(rfcomm_run, NULL, CLONE_KERNEL); | |
2084 | ||
2085 | BT_INFO("RFCOMM ver %s", VERSION); | |
2086 | ||
2087 | rfcomm_proc_init(); | |
2088 | ||
2089 | rfcomm_init_sockets(); | |
2090 | ||
2091 | #ifdef CONFIG_BT_RFCOMM_TTY | |
2092 | rfcomm_init_ttys(); | |
2093 | #endif | |
2094 | ||
2095 | return 0; | |
2096 | } | |
2097 | ||
2098 | static void __exit rfcomm_exit(void) | |
2099 | { | |
2100 | hci_unregister_cb(&rfcomm_cb); | |
2101 | ||
2102 | /* Terminate working thread. | |
2103 | * ie. Set terminate flag and wake it up */ | |
2104 | atomic_inc(&terminate); | |
2105 | rfcomm_schedule(RFCOMM_SCHED_STATE); | |
2106 | ||
2107 | /* Wait until thread is running */ | |
2108 | while (atomic_read(&running)) | |
2109 | schedule(); | |
2110 | ||
2111 | #ifdef CONFIG_BT_RFCOMM_TTY | |
2112 | rfcomm_cleanup_ttys(); | |
2113 | #endif | |
2114 | ||
2115 | rfcomm_cleanup_sockets(); | |
2116 | ||
2117 | rfcomm_proc_cleanup(); | |
2118 | } | |
2119 | ||
2120 | module_init(rfcomm_init); | |
2121 | module_exit(rfcomm_exit); | |
2122 | ||
2123 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); | |
2124 | MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION); | |
2125 | MODULE_VERSION(VERSION); | |
2126 | MODULE_LICENSE("GPL"); | |
2127 | MODULE_ALIAS("bt-proto-3"); |