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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 | ||
1da177e4 LT |
24 | /* |
25 | * Bluetooth RFCOMM core. | |
26 | * | |
27 | * $Id: core.c,v 1.42 2002/10/01 23:26:25 maxk Exp $ | |
28 | */ | |
29 | ||
30 | #include <linux/config.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/sched.h> | |
35 | #include <linux/signal.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/wait.h> | |
38 | #include <linux/net.h> | |
39 | #include <linux/proc_fs.h> | |
40 | #include <linux/seq_file.h> | |
41 | #include <net/sock.h> | |
42 | #include <asm/uaccess.h> | |
43 | #include <asm/unaligned.h> | |
44 | ||
45 | #include <net/bluetooth/bluetooth.h> | |
46 | #include <net/bluetooth/hci_core.h> | |
47 | #include <net/bluetooth/l2cap.h> | |
48 | #include <net/bluetooth/rfcomm.h> | |
49 | ||
50 | #define VERSION "1.5" | |
51 | ||
52 | #ifndef CONFIG_BT_RFCOMM_DEBUG | |
53 | #undef BT_DBG | |
54 | #define BT_DBG(D...) | |
55 | #endif | |
56 | ||
57 | #ifdef CONFIG_PROC_FS | |
58 | struct proc_dir_entry *proc_bt_rfcomm; | |
59 | #endif | |
60 | ||
61 | static struct task_struct *rfcomm_thread; | |
62 | ||
63 | static DECLARE_MUTEX(rfcomm_sem); | |
64 | #define rfcomm_lock() down(&rfcomm_sem); | |
65 | #define rfcomm_unlock() up(&rfcomm_sem); | |
66 | ||
67 | static unsigned long rfcomm_event; | |
68 | ||
69 | static LIST_HEAD(session_list); | |
70 | static atomic_t terminate, running; | |
71 | ||
72 | static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len); | |
73 | static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci); | |
74 | static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci); | |
75 | static int rfcomm_queue_disc(struct rfcomm_dlc *d); | |
76 | static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type); | |
77 | static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d); | |
78 | static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig); | |
79 | static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len); | |
80 | static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits); | |
81 | static void rfcomm_make_uih(struct sk_buff *skb, u8 addr); | |
82 | ||
83 | static void rfcomm_process_connect(struct rfcomm_session *s); | |
84 | ||
85 | static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err); | |
86 | static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst); | |
87 | static void rfcomm_session_del(struct rfcomm_session *s); | |
88 | ||
89 | /* ---- RFCOMM frame parsing macros ---- */ | |
90 | #define __get_dlci(b) ((b & 0xfc) >> 2) | |
91 | #define __get_channel(b) ((b & 0xf8) >> 3) | |
92 | #define __get_dir(b) ((b & 0x04) >> 2) | |
93 | #define __get_type(b) ((b & 0xef)) | |
94 | ||
95 | #define __test_ea(b) ((b & 0x01)) | |
96 | #define __test_cr(b) ((b & 0x02)) | |
97 | #define __test_pf(b) ((b & 0x10)) | |
98 | ||
99 | #define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01) | |
100 | #define __ctrl(type, pf) (((type & 0xef) | (pf << 4))) | |
101 | #define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir) | |
102 | #define __srv_channel(dlci) (dlci >> 1) | |
103 | #define __dir(dlci) (dlci & 0x01) | |
104 | ||
105 | #define __len8(len) (((len) << 1) | 1) | |
106 | #define __len16(len) ((len) << 1) | |
107 | ||
108 | /* MCC macros */ | |
109 | #define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01)) | |
110 | #define __get_mcc_type(b) ((b & 0xfc) >> 2) | |
111 | #define __get_mcc_len(b) ((b & 0xfe) >> 1) | |
112 | ||
113 | /* RPN macros */ | |
3a5e903c | 114 | #define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3)) |
1da177e4 LT |
115 | #define __get_rpn_data_bits(line) ((line) & 0x3) |
116 | #define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1) | |
3a5e903c | 117 | #define __get_rpn_parity(line) (((line) >> 3) & 0x7) |
1da177e4 LT |
118 | |
119 | static inline void rfcomm_schedule(uint event) | |
120 | { | |
121 | if (!rfcomm_thread) | |
122 | return; | |
123 | //set_bit(event, &rfcomm_event); | |
124 | set_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event); | |
125 | wake_up_process(rfcomm_thread); | |
126 | } | |
127 | ||
128 | static inline void rfcomm_session_put(struct rfcomm_session *s) | |
129 | { | |
130 | if (atomic_dec_and_test(&s->refcnt)) | |
131 | rfcomm_session_del(s); | |
132 | } | |
133 | ||
134 | /* ---- RFCOMM FCS computation ---- */ | |
135 | ||
136 | /* CRC on 2 bytes */ | |
137 | #define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]]) | |
138 | ||
139 | /* FCS on 2 bytes */ | |
140 | static inline u8 __fcs(u8 *data) | |
141 | { | |
142 | return (0xff - __crc(data)); | |
143 | } | |
144 | ||
145 | /* FCS on 3 bytes */ | |
146 | static inline u8 __fcs2(u8 *data) | |
147 | { | |
148 | return (0xff - rfcomm_crc_table[__crc(data) ^ data[2]]); | |
149 | } | |
150 | ||
151 | /* Check FCS */ | |
152 | static inline int __check_fcs(u8 *data, int type, u8 fcs) | |
153 | { | |
154 | u8 f = __crc(data); | |
155 | ||
156 | if (type != RFCOMM_UIH) | |
157 | f = rfcomm_crc_table[f ^ data[2]]; | |
158 | ||
159 | return rfcomm_crc_table[f ^ fcs] != 0xcf; | |
160 | } | |
161 | ||
162 | /* ---- L2CAP callbacks ---- */ | |
163 | static void rfcomm_l2state_change(struct sock *sk) | |
164 | { | |
165 | BT_DBG("%p state %d", sk, sk->sk_state); | |
166 | rfcomm_schedule(RFCOMM_SCHED_STATE); | |
167 | } | |
168 | ||
169 | static void rfcomm_l2data_ready(struct sock *sk, int bytes) | |
170 | { | |
171 | BT_DBG("%p bytes %d", sk, bytes); | |
172 | rfcomm_schedule(RFCOMM_SCHED_RX); | |
173 | } | |
174 | ||
175 | static int rfcomm_l2sock_create(struct socket **sock) | |
176 | { | |
177 | int err; | |
178 | ||
179 | BT_DBG(""); | |
180 | ||
181 | err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock); | |
182 | if (!err) { | |
183 | struct sock *sk = (*sock)->sk; | |
184 | sk->sk_data_ready = rfcomm_l2data_ready; | |
185 | sk->sk_state_change = rfcomm_l2state_change; | |
186 | } | |
187 | return err; | |
188 | } | |
189 | ||
190 | /* ---- RFCOMM DLCs ---- */ | |
191 | static void rfcomm_dlc_timeout(unsigned long arg) | |
192 | { | |
193 | struct rfcomm_dlc *d = (void *) arg; | |
194 | ||
195 | BT_DBG("dlc %p state %ld", d, d->state); | |
196 | ||
197 | set_bit(RFCOMM_TIMED_OUT, &d->flags); | |
198 | rfcomm_dlc_put(d); | |
199 | rfcomm_schedule(RFCOMM_SCHED_TIMEO); | |
200 | } | |
201 | ||
202 | static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout) | |
203 | { | |
204 | BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout); | |
205 | ||
206 | if (!mod_timer(&d->timer, jiffies + timeout)) | |
207 | rfcomm_dlc_hold(d); | |
208 | } | |
209 | ||
210 | static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d) | |
211 | { | |
212 | BT_DBG("dlc %p state %ld", d, d->state); | |
213 | ||
214 | if (timer_pending(&d->timer) && del_timer(&d->timer)) | |
215 | rfcomm_dlc_put(d); | |
216 | } | |
217 | ||
218 | static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d) | |
219 | { | |
220 | BT_DBG("%p", d); | |
221 | ||
222 | d->state = BT_OPEN; | |
223 | d->flags = 0; | |
224 | d->mscex = 0; | |
225 | d->mtu = RFCOMM_DEFAULT_MTU; | |
226 | d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV; | |
227 | ||
228 | d->cfc = RFCOMM_CFC_DISABLED; | |
229 | d->rx_credits = RFCOMM_DEFAULT_CREDITS; | |
230 | } | |
231 | ||
dd0fc66f | 232 | struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio) |
1da177e4 LT |
233 | { |
234 | struct rfcomm_dlc *d = kmalloc(sizeof(*d), prio); | |
235 | if (!d) | |
236 | return NULL; | |
237 | memset(d, 0, sizeof(*d)); | |
238 | ||
239 | init_timer(&d->timer); | |
240 | d->timer.function = rfcomm_dlc_timeout; | |
241 | d->timer.data = (unsigned long) d; | |
242 | ||
243 | skb_queue_head_init(&d->tx_queue); | |
244 | spin_lock_init(&d->lock); | |
245 | atomic_set(&d->refcnt, 1); | |
246 | ||
247 | rfcomm_dlc_clear_state(d); | |
248 | ||
249 | BT_DBG("%p", d); | |
250 | return d; | |
251 | } | |
252 | ||
253 | void rfcomm_dlc_free(struct rfcomm_dlc *d) | |
254 | { | |
255 | BT_DBG("%p", d); | |
256 | ||
257 | skb_queue_purge(&d->tx_queue); | |
258 | kfree(d); | |
259 | } | |
260 | ||
261 | static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d) | |
262 | { | |
263 | BT_DBG("dlc %p session %p", d, s); | |
264 | ||
265 | rfcomm_session_hold(s); | |
266 | ||
267 | rfcomm_dlc_hold(d); | |
268 | list_add(&d->list, &s->dlcs); | |
269 | d->session = s; | |
270 | } | |
271 | ||
272 | static void rfcomm_dlc_unlink(struct rfcomm_dlc *d) | |
273 | { | |
274 | struct rfcomm_session *s = d->session; | |
275 | ||
276 | BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s); | |
277 | ||
278 | list_del(&d->list); | |
279 | d->session = NULL; | |
280 | rfcomm_dlc_put(d); | |
281 | ||
282 | rfcomm_session_put(s); | |
283 | } | |
284 | ||
285 | static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci) | |
286 | { | |
287 | struct rfcomm_dlc *d; | |
288 | struct list_head *p; | |
289 | ||
290 | list_for_each(p, &s->dlcs) { | |
291 | d = list_entry(p, struct rfcomm_dlc, list); | |
292 | if (d->dlci == dlci) | |
293 | return d; | |
294 | } | |
295 | return NULL; | |
296 | } | |
297 | ||
298 | static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) | |
299 | { | |
300 | struct rfcomm_session *s; | |
301 | int err = 0; | |
302 | u8 dlci; | |
303 | ||
304 | BT_DBG("dlc %p state %ld %s %s channel %d", | |
305 | d, d->state, batostr(src), batostr(dst), channel); | |
306 | ||
307 | if (channel < 1 || channel > 30) | |
308 | return -EINVAL; | |
309 | ||
310 | if (d->state != BT_OPEN && d->state != BT_CLOSED) | |
311 | return 0; | |
312 | ||
313 | s = rfcomm_session_get(src, dst); | |
314 | if (!s) { | |
315 | s = rfcomm_session_create(src, dst, &err); | |
316 | if (!s) | |
317 | return err; | |
318 | } | |
319 | ||
320 | dlci = __dlci(!s->initiator, channel); | |
321 | ||
322 | /* Check if DLCI already exists */ | |
323 | if (rfcomm_dlc_get(s, dlci)) | |
324 | return -EBUSY; | |
325 | ||
326 | rfcomm_dlc_clear_state(d); | |
327 | ||
328 | d->dlci = dlci; | |
329 | d->addr = __addr(s->initiator, dlci); | |
330 | d->priority = 7; | |
331 | ||
332 | d->state = BT_CONFIG; | |
333 | rfcomm_dlc_link(s, d); | |
334 | ||
335 | d->mtu = s->mtu; | |
336 | d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc; | |
337 | ||
338 | if (s->state == BT_CONNECTED) | |
339 | rfcomm_send_pn(s, 1, d); | |
340 | rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) | |
345 | { | |
346 | int r; | |
347 | ||
348 | rfcomm_lock(); | |
349 | ||
350 | r = __rfcomm_dlc_open(d, src, dst, channel); | |
351 | ||
352 | rfcomm_unlock(); | |
353 | return r; | |
354 | } | |
355 | ||
356 | static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err) | |
357 | { | |
358 | struct rfcomm_session *s = d->session; | |
359 | if (!s) | |
360 | return 0; | |
361 | ||
362 | BT_DBG("dlc %p state %ld dlci %d err %d session %p", | |
363 | d, d->state, d->dlci, err, s); | |
364 | ||
365 | switch (d->state) { | |
366 | case BT_CONNECTED: | |
367 | case BT_CONFIG: | |
368 | case BT_CONNECT: | |
369 | d->state = BT_DISCONN; | |
370 | if (skb_queue_empty(&d->tx_queue)) { | |
371 | rfcomm_send_disc(s, d->dlci); | |
372 | rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT); | |
373 | } else { | |
374 | rfcomm_queue_disc(d); | |
375 | rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2); | |
376 | } | |
377 | break; | |
378 | ||
379 | default: | |
380 | rfcomm_dlc_clear_timer(d); | |
381 | ||
382 | rfcomm_dlc_lock(d); | |
383 | d->state = BT_CLOSED; | |
384 | d->state_change(d, err); | |
385 | rfcomm_dlc_unlock(d); | |
386 | ||
387 | skb_queue_purge(&d->tx_queue); | |
1da177e4 LT |
388 | rfcomm_dlc_unlink(d); |
389 | } | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | int rfcomm_dlc_close(struct rfcomm_dlc *d, int err) | |
395 | { | |
396 | int r; | |
397 | ||
398 | rfcomm_lock(); | |
399 | ||
400 | r = __rfcomm_dlc_close(d, err); | |
401 | ||
402 | rfcomm_unlock(); | |
403 | return r; | |
404 | } | |
405 | ||
406 | int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb) | |
407 | { | |
408 | int len = skb->len; | |
409 | ||
410 | if (d->state != BT_CONNECTED) | |
411 | return -ENOTCONN; | |
412 | ||
413 | BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len); | |
414 | ||
415 | if (len > d->mtu) | |
416 | return -EINVAL; | |
417 | ||
418 | rfcomm_make_uih(skb, d->addr); | |
419 | skb_queue_tail(&d->tx_queue, skb); | |
420 | ||
421 | if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags)) | |
422 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
423 | return len; | |
424 | } | |
425 | ||
426 | void fastcall __rfcomm_dlc_throttle(struct rfcomm_dlc *d) | |
427 | { | |
428 | BT_DBG("dlc %p state %ld", d, d->state); | |
429 | ||
430 | if (!d->cfc) { | |
431 | d->v24_sig |= RFCOMM_V24_FC; | |
432 | set_bit(RFCOMM_MSC_PENDING, &d->flags); | |
433 | } | |
434 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
435 | } | |
436 | ||
437 | void fastcall __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d) | |
438 | { | |
439 | BT_DBG("dlc %p state %ld", d, d->state); | |
440 | ||
441 | if (!d->cfc) { | |
442 | d->v24_sig &= ~RFCOMM_V24_FC; | |
443 | set_bit(RFCOMM_MSC_PENDING, &d->flags); | |
444 | } | |
445 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
446 | } | |
447 | ||
448 | /* | |
449 | Set/get modem status functions use _local_ status i.e. what we report | |
450 | to the other side. | |
451 | Remote status is provided by dlc->modem_status() callback. | |
452 | */ | |
453 | int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig) | |
454 | { | |
455 | BT_DBG("dlc %p state %ld v24_sig 0x%x", | |
456 | d, d->state, v24_sig); | |
457 | ||
458 | if (test_bit(RFCOMM_RX_THROTTLED, &d->flags)) | |
459 | v24_sig |= RFCOMM_V24_FC; | |
460 | else | |
461 | v24_sig &= ~RFCOMM_V24_FC; | |
462 | ||
463 | d->v24_sig = v24_sig; | |
464 | ||
465 | if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags)) | |
466 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
471 | int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig) | |
472 | { | |
473 | BT_DBG("dlc %p state %ld v24_sig 0x%x", | |
474 | d, d->state, d->v24_sig); | |
475 | ||
476 | *v24_sig = d->v24_sig; | |
477 | return 0; | |
478 | } | |
479 | ||
480 | /* ---- RFCOMM sessions ---- */ | |
481 | static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state) | |
482 | { | |
483 | struct rfcomm_session *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
484 | if (!s) | |
485 | return NULL; | |
486 | memset(s, 0, sizeof(*s)); | |
487 | ||
488 | BT_DBG("session %p sock %p", s, sock); | |
489 | ||
490 | INIT_LIST_HEAD(&s->dlcs); | |
491 | s->state = state; | |
492 | s->sock = sock; | |
493 | ||
494 | s->mtu = RFCOMM_DEFAULT_MTU; | |
495 | s->cfc = RFCOMM_CFC_UNKNOWN; | |
496 | ||
497 | /* Do not increment module usage count for listening sessions. | |
498 | * Otherwise we won't be able to unload the module. */ | |
499 | if (state != BT_LISTEN) | |
500 | if (!try_module_get(THIS_MODULE)) { | |
501 | kfree(s); | |
502 | return NULL; | |
503 | } | |
504 | ||
505 | list_add(&s->list, &session_list); | |
506 | ||
507 | return s; | |
508 | } | |
509 | ||
510 | static void rfcomm_session_del(struct rfcomm_session *s) | |
511 | { | |
512 | int state = s->state; | |
513 | ||
514 | BT_DBG("session %p state %ld", s, s->state); | |
515 | ||
516 | list_del(&s->list); | |
517 | ||
518 | if (state == BT_CONNECTED) | |
519 | rfcomm_send_disc(s, 0); | |
520 | ||
521 | sock_release(s->sock); | |
522 | kfree(s); | |
523 | ||
524 | if (state != BT_LISTEN) | |
525 | module_put(THIS_MODULE); | |
526 | } | |
527 | ||
528 | static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst) | |
529 | { | |
530 | struct rfcomm_session *s; | |
531 | struct list_head *p, *n; | |
532 | struct bt_sock *sk; | |
533 | list_for_each_safe(p, n, &session_list) { | |
534 | s = list_entry(p, struct rfcomm_session, list); | |
535 | sk = bt_sk(s->sock->sk); | |
536 | ||
537 | if ((!bacmp(src, BDADDR_ANY) || !bacmp(&sk->src, src)) && | |
538 | !bacmp(&sk->dst, dst)) | |
539 | return s; | |
540 | } | |
541 | return NULL; | |
542 | } | |
543 | ||
544 | static void rfcomm_session_close(struct rfcomm_session *s, int err) | |
545 | { | |
546 | struct rfcomm_dlc *d; | |
547 | struct list_head *p, *n; | |
548 | ||
549 | BT_DBG("session %p state %ld err %d", s, s->state, err); | |
550 | ||
551 | rfcomm_session_hold(s); | |
552 | ||
553 | s->state = BT_CLOSED; | |
554 | ||
555 | /* Close all dlcs */ | |
556 | list_for_each_safe(p, n, &s->dlcs) { | |
557 | d = list_entry(p, struct rfcomm_dlc, list); | |
558 | d->state = BT_CLOSED; | |
559 | __rfcomm_dlc_close(d, err); | |
560 | } | |
561 | ||
562 | rfcomm_session_put(s); | |
563 | } | |
564 | ||
565 | static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err) | |
566 | { | |
567 | struct rfcomm_session *s = NULL; | |
568 | struct sockaddr_l2 addr; | |
569 | struct socket *sock; | |
570 | struct sock *sk; | |
571 | ||
572 | BT_DBG("%s %s", batostr(src), batostr(dst)); | |
573 | ||
574 | *err = rfcomm_l2sock_create(&sock); | |
575 | if (*err < 0) | |
576 | return NULL; | |
577 | ||
578 | bacpy(&addr.l2_bdaddr, src); | |
579 | addr.l2_family = AF_BLUETOOTH; | |
580 | addr.l2_psm = 0; | |
581 | *err = sock->ops->bind(sock, (struct sockaddr *) &addr, sizeof(addr)); | |
582 | if (*err < 0) | |
583 | goto failed; | |
584 | ||
585 | /* Set L2CAP options */ | |
586 | sk = sock->sk; | |
587 | lock_sock(sk); | |
588 | l2cap_pi(sk)->imtu = RFCOMM_MAX_L2CAP_MTU; | |
589 | release_sock(sk); | |
590 | ||
591 | s = rfcomm_session_add(sock, BT_BOUND); | |
592 | if (!s) { | |
593 | *err = -ENOMEM; | |
594 | goto failed; | |
595 | } | |
596 | ||
1da177e4 LT |
597 | s->initiator = 1; |
598 | ||
599 | bacpy(&addr.l2_bdaddr, dst); | |
600 | addr.l2_family = AF_BLUETOOTH; | |
601 | addr.l2_psm = htobs(RFCOMM_PSM); | |
602 | *err = sock->ops->connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK); | |
603 | if (*err == 0 || *err == -EAGAIN) | |
604 | return s; | |
605 | ||
606 | rfcomm_session_del(s); | |
607 | return NULL; | |
608 | ||
609 | failed: | |
610 | sock_release(sock); | |
611 | return NULL; | |
612 | } | |
613 | ||
614 | void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst) | |
615 | { | |
616 | struct sock *sk = s->sock->sk; | |
617 | if (src) | |
618 | bacpy(src, &bt_sk(sk)->src); | |
619 | if (dst) | |
620 | bacpy(dst, &bt_sk(sk)->dst); | |
621 | } | |
622 | ||
623 | /* ---- RFCOMM frame sending ---- */ | |
624 | static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len) | |
625 | { | |
626 | struct socket *sock = s->sock; | |
627 | struct kvec iv = { data, len }; | |
628 | struct msghdr msg; | |
629 | ||
630 | BT_DBG("session %p len %d", s, len); | |
631 | ||
632 | memset(&msg, 0, sizeof(msg)); | |
633 | ||
634 | return kernel_sendmsg(sock, &msg, &iv, 1, len); | |
635 | } | |
636 | ||
637 | static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci) | |
638 | { | |
639 | struct rfcomm_cmd cmd; | |
640 | ||
641 | BT_DBG("%p dlci %d", s, dlci); | |
642 | ||
643 | cmd.addr = __addr(s->initiator, dlci); | |
644 | cmd.ctrl = __ctrl(RFCOMM_SABM, 1); | |
645 | cmd.len = __len8(0); | |
646 | cmd.fcs = __fcs2((u8 *) &cmd); | |
647 | ||
648 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
649 | } | |
650 | ||
651 | static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci) | |
652 | { | |
653 | struct rfcomm_cmd cmd; | |
654 | ||
655 | BT_DBG("%p dlci %d", s, dlci); | |
656 | ||
657 | cmd.addr = __addr(!s->initiator, dlci); | |
658 | cmd.ctrl = __ctrl(RFCOMM_UA, 1); | |
659 | cmd.len = __len8(0); | |
660 | cmd.fcs = __fcs2((u8 *) &cmd); | |
661 | ||
662 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
663 | } | |
664 | ||
665 | static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci) | |
666 | { | |
667 | struct rfcomm_cmd cmd; | |
668 | ||
669 | BT_DBG("%p dlci %d", s, dlci); | |
670 | ||
671 | cmd.addr = __addr(s->initiator, dlci); | |
672 | cmd.ctrl = __ctrl(RFCOMM_DISC, 1); | |
673 | cmd.len = __len8(0); | |
674 | cmd.fcs = __fcs2((u8 *) &cmd); | |
675 | ||
676 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
677 | } | |
678 | ||
679 | static int rfcomm_queue_disc(struct rfcomm_dlc *d) | |
680 | { | |
681 | struct rfcomm_cmd *cmd; | |
682 | struct sk_buff *skb; | |
683 | ||
684 | BT_DBG("dlc %p dlci %d", d, d->dlci); | |
685 | ||
686 | skb = alloc_skb(sizeof(*cmd), GFP_KERNEL); | |
687 | if (!skb) | |
688 | return -ENOMEM; | |
689 | ||
690 | cmd = (void *) __skb_put(skb, sizeof(*cmd)); | |
691 | cmd->addr = d->addr; | |
692 | cmd->ctrl = __ctrl(RFCOMM_DISC, 1); | |
693 | cmd->len = __len8(0); | |
694 | cmd->fcs = __fcs2((u8 *) cmd); | |
695 | ||
696 | skb_queue_tail(&d->tx_queue, skb); | |
697 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
698 | return 0; | |
699 | } | |
700 | ||
701 | static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci) | |
702 | { | |
703 | struct rfcomm_cmd cmd; | |
704 | ||
705 | BT_DBG("%p dlci %d", s, dlci); | |
706 | ||
707 | cmd.addr = __addr(!s->initiator, dlci); | |
708 | cmd.ctrl = __ctrl(RFCOMM_DM, 1); | |
709 | cmd.len = __len8(0); | |
710 | cmd.fcs = __fcs2((u8 *) &cmd); | |
711 | ||
712 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
713 | } | |
714 | ||
715 | static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type) | |
716 | { | |
717 | struct rfcomm_hdr *hdr; | |
718 | struct rfcomm_mcc *mcc; | |
719 | u8 buf[16], *ptr = buf; | |
720 | ||
721 | BT_DBG("%p cr %d type %d", s, cr, type); | |
722 | ||
723 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
724 | hdr->addr = __addr(s->initiator, 0); | |
725 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
726 | hdr->len = __len8(sizeof(*mcc) + 1); | |
727 | ||
728 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
729 | mcc->type = __mcc_type(cr, RFCOMM_NSC); | |
730 | mcc->len = __len8(1); | |
731 | ||
732 | /* Type that we didn't like */ | |
733 | *ptr = __mcc_type(cr, type); ptr++; | |
734 | ||
735 | *ptr = __fcs(buf); ptr++; | |
736 | ||
737 | return rfcomm_send_frame(s, buf, ptr - buf); | |
738 | } | |
739 | ||
740 | static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d) | |
741 | { | |
742 | struct rfcomm_hdr *hdr; | |
743 | struct rfcomm_mcc *mcc; | |
744 | struct rfcomm_pn *pn; | |
745 | u8 buf[16], *ptr = buf; | |
746 | ||
747 | BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu); | |
748 | ||
749 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
750 | hdr->addr = __addr(s->initiator, 0); | |
751 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
752 | hdr->len = __len8(sizeof(*mcc) + sizeof(*pn)); | |
753 | ||
754 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
755 | mcc->type = __mcc_type(cr, RFCOMM_PN); | |
756 | mcc->len = __len8(sizeof(*pn)); | |
757 | ||
758 | pn = (void *) ptr; ptr += sizeof(*pn); | |
759 | pn->dlci = d->dlci; | |
760 | pn->priority = d->priority; | |
761 | pn->ack_timer = 0; | |
762 | pn->max_retrans = 0; | |
763 | ||
764 | if (s->cfc) { | |
765 | pn->flow_ctrl = cr ? 0xf0 : 0xe0; | |
766 | pn->credits = RFCOMM_DEFAULT_CREDITS; | |
767 | } else { | |
768 | pn->flow_ctrl = 0; | |
769 | pn->credits = 0; | |
770 | } | |
771 | ||
772 | pn->mtu = htobs(d->mtu); | |
773 | ||
774 | *ptr = __fcs(buf); ptr++; | |
775 | ||
776 | return rfcomm_send_frame(s, buf, ptr - buf); | |
777 | } | |
778 | ||
3a5e903c S |
779 | int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci, |
780 | u8 bit_rate, u8 data_bits, u8 stop_bits, | |
781 | u8 parity, u8 flow_ctrl_settings, | |
782 | u8 xon_char, u8 xoff_char, u16 param_mask) | |
1da177e4 LT |
783 | { |
784 | struct rfcomm_hdr *hdr; | |
785 | struct rfcomm_mcc *mcc; | |
786 | struct rfcomm_rpn *rpn; | |
787 | u8 buf[16], *ptr = buf; | |
788 | ||
789 | BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x" | |
3a5e903c S |
790 | " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x", |
791 | s, cr, dlci, bit_rate, data_bits, stop_bits, parity, | |
792 | flow_ctrl_settings, xon_char, xoff_char, param_mask); | |
1da177e4 LT |
793 | |
794 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
795 | hdr->addr = __addr(s->initiator, 0); | |
796 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
797 | hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn)); | |
798 | ||
799 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
800 | mcc->type = __mcc_type(cr, RFCOMM_RPN); | |
801 | mcc->len = __len8(sizeof(*rpn)); | |
802 | ||
803 | rpn = (void *) ptr; ptr += sizeof(*rpn); | |
804 | rpn->dlci = __addr(1, dlci); | |
805 | rpn->bit_rate = bit_rate; | |
806 | rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity); | |
807 | rpn->flow_ctrl = flow_ctrl_settings; | |
808 | rpn->xon_char = xon_char; | |
809 | rpn->xoff_char = xoff_char; | |
810 | rpn->param_mask = param_mask; | |
811 | ||
812 | *ptr = __fcs(buf); ptr++; | |
813 | ||
814 | return rfcomm_send_frame(s, buf, ptr - buf); | |
815 | } | |
816 | ||
817 | static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status) | |
818 | { | |
819 | struct rfcomm_hdr *hdr; | |
820 | struct rfcomm_mcc *mcc; | |
821 | struct rfcomm_rls *rls; | |
822 | u8 buf[16], *ptr = buf; | |
823 | ||
824 | BT_DBG("%p cr %d status 0x%x", s, cr, status); | |
825 | ||
826 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
827 | hdr->addr = __addr(s->initiator, 0); | |
828 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
829 | hdr->len = __len8(sizeof(*mcc) + sizeof(*rls)); | |
830 | ||
831 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
832 | mcc->type = __mcc_type(cr, RFCOMM_RLS); | |
833 | mcc->len = __len8(sizeof(*rls)); | |
834 | ||
835 | rls = (void *) ptr; ptr += sizeof(*rls); | |
836 | rls->dlci = __addr(1, dlci); | |
837 | rls->status = status; | |
838 | ||
839 | *ptr = __fcs(buf); ptr++; | |
840 | ||
841 | return rfcomm_send_frame(s, buf, ptr - buf); | |
842 | } | |
843 | ||
844 | static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig) | |
845 | { | |
846 | struct rfcomm_hdr *hdr; | |
847 | struct rfcomm_mcc *mcc; | |
848 | struct rfcomm_msc *msc; | |
849 | u8 buf[16], *ptr = buf; | |
850 | ||
851 | BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig); | |
852 | ||
853 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
854 | hdr->addr = __addr(s->initiator, 0); | |
855 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
856 | hdr->len = __len8(sizeof(*mcc) + sizeof(*msc)); | |
857 | ||
858 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
859 | mcc->type = __mcc_type(cr, RFCOMM_MSC); | |
860 | mcc->len = __len8(sizeof(*msc)); | |
861 | ||
862 | msc = (void *) ptr; ptr += sizeof(*msc); | |
863 | msc->dlci = __addr(1, dlci); | |
864 | msc->v24_sig = v24_sig | 0x01; | |
865 | ||
866 | *ptr = __fcs(buf); ptr++; | |
867 | ||
868 | return rfcomm_send_frame(s, buf, ptr - buf); | |
869 | } | |
870 | ||
871 | static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr) | |
872 | { | |
873 | struct rfcomm_hdr *hdr; | |
874 | struct rfcomm_mcc *mcc; | |
875 | u8 buf[16], *ptr = buf; | |
876 | ||
877 | BT_DBG("%p cr %d", s, cr); | |
878 | ||
879 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
880 | hdr->addr = __addr(s->initiator, 0); | |
881 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
882 | hdr->len = __len8(sizeof(*mcc)); | |
883 | ||
884 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
885 | mcc->type = __mcc_type(cr, RFCOMM_FCOFF); | |
886 | mcc->len = __len8(0); | |
887 | ||
888 | *ptr = __fcs(buf); ptr++; | |
889 | ||
890 | return rfcomm_send_frame(s, buf, ptr - buf); | |
891 | } | |
892 | ||
893 | static int rfcomm_send_fcon(struct rfcomm_session *s, int cr) | |
894 | { | |
895 | struct rfcomm_hdr *hdr; | |
896 | struct rfcomm_mcc *mcc; | |
897 | u8 buf[16], *ptr = buf; | |
898 | ||
899 | BT_DBG("%p cr %d", s, cr); | |
900 | ||
901 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
902 | hdr->addr = __addr(s->initiator, 0); | |
903 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
904 | hdr->len = __len8(sizeof(*mcc)); | |
905 | ||
906 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
907 | mcc->type = __mcc_type(cr, RFCOMM_FCON); | |
908 | mcc->len = __len8(0); | |
909 | ||
910 | *ptr = __fcs(buf); ptr++; | |
911 | ||
912 | return rfcomm_send_frame(s, buf, ptr - buf); | |
913 | } | |
914 | ||
915 | static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len) | |
916 | { | |
917 | struct socket *sock = s->sock; | |
918 | struct kvec iv[3]; | |
919 | struct msghdr msg; | |
920 | unsigned char hdr[5], crc[1]; | |
921 | ||
922 | if (len > 125) | |
923 | return -EINVAL; | |
924 | ||
925 | BT_DBG("%p cr %d", s, cr); | |
926 | ||
927 | hdr[0] = __addr(s->initiator, 0); | |
928 | hdr[1] = __ctrl(RFCOMM_UIH, 0); | |
929 | hdr[2] = 0x01 | ((len + 2) << 1); | |
930 | hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2); | |
931 | hdr[4] = 0x01 | (len << 1); | |
932 | ||
933 | crc[0] = __fcs(hdr); | |
934 | ||
935 | iv[0].iov_base = hdr; | |
936 | iv[0].iov_len = 5; | |
937 | iv[1].iov_base = pattern; | |
938 | iv[1].iov_len = len; | |
939 | iv[2].iov_base = crc; | |
940 | iv[2].iov_len = 1; | |
941 | ||
942 | memset(&msg, 0, sizeof(msg)); | |
943 | ||
944 | return kernel_sendmsg(sock, &msg, iv, 3, 6 + len); | |
945 | } | |
946 | ||
947 | static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits) | |
948 | { | |
949 | struct rfcomm_hdr *hdr; | |
950 | u8 buf[16], *ptr = buf; | |
951 | ||
952 | BT_DBG("%p addr %d credits %d", s, addr, credits); | |
953 | ||
954 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
955 | hdr->addr = addr; | |
956 | hdr->ctrl = __ctrl(RFCOMM_UIH, 1); | |
957 | hdr->len = __len8(0); | |
958 | ||
959 | *ptr = credits; ptr++; | |
960 | ||
961 | *ptr = __fcs(buf); ptr++; | |
962 | ||
963 | return rfcomm_send_frame(s, buf, ptr - buf); | |
964 | } | |
965 | ||
966 | static void rfcomm_make_uih(struct sk_buff *skb, u8 addr) | |
967 | { | |
968 | struct rfcomm_hdr *hdr; | |
969 | int len = skb->len; | |
970 | u8 *crc; | |
971 | ||
972 | if (len > 127) { | |
973 | hdr = (void *) skb_push(skb, 4); | |
974 | put_unaligned(htobs(__len16(len)), (u16 *) &hdr->len); | |
975 | } else { | |
976 | hdr = (void *) skb_push(skb, 3); | |
977 | hdr->len = __len8(len); | |
978 | } | |
979 | hdr->addr = addr; | |
980 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
981 | ||
982 | crc = skb_put(skb, 1); | |
983 | *crc = __fcs((void *) hdr); | |
984 | } | |
985 | ||
986 | /* ---- RFCOMM frame reception ---- */ | |
987 | static int rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci) | |
988 | { | |
989 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
990 | ||
991 | if (dlci) { | |
992 | /* Data channel */ | |
993 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); | |
994 | if (!d) { | |
995 | rfcomm_send_dm(s, dlci); | |
996 | return 0; | |
997 | } | |
998 | ||
999 | switch (d->state) { | |
1000 | case BT_CONNECT: | |
1001 | rfcomm_dlc_clear_timer(d); | |
1002 | ||
1003 | rfcomm_dlc_lock(d); | |
1004 | d->state = BT_CONNECTED; | |
1005 | d->state_change(d, 0); | |
1006 | rfcomm_dlc_unlock(d); | |
1007 | ||
1008 | rfcomm_send_msc(s, 1, dlci, d->v24_sig); | |
1009 | break; | |
1010 | ||
1011 | case BT_DISCONN: | |
1012 | d->state = BT_CLOSED; | |
1013 | __rfcomm_dlc_close(d, 0); | |
1014 | break; | |
1015 | } | |
1016 | } else { | |
1017 | /* Control channel */ | |
1018 | switch (s->state) { | |
1019 | case BT_CONNECT: | |
1020 | s->state = BT_CONNECTED; | |
1021 | rfcomm_process_connect(s); | |
1022 | break; | |
1023 | } | |
1024 | } | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | static int rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci) | |
1029 | { | |
1030 | int err = 0; | |
1031 | ||
1032 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1033 | ||
1034 | if (dlci) { | |
1035 | /* Data DLC */ | |
1036 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); | |
1037 | if (d) { | |
1038 | if (d->state == BT_CONNECT || d->state == BT_CONFIG) | |
1039 | err = ECONNREFUSED; | |
1040 | else | |
1041 | err = ECONNRESET; | |
1042 | ||
1043 | d->state = BT_CLOSED; | |
1044 | __rfcomm_dlc_close(d, err); | |
1045 | } | |
1046 | } else { | |
1047 | if (s->state == BT_CONNECT) | |
1048 | err = ECONNREFUSED; | |
1049 | else | |
1050 | err = ECONNRESET; | |
1051 | ||
1052 | s->state = BT_CLOSED; | |
1053 | rfcomm_session_close(s, err); | |
1054 | } | |
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci) | |
1059 | { | |
1060 | int err = 0; | |
1061 | ||
1062 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1063 | ||
1064 | if (dlci) { | |
1065 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); | |
1066 | if (d) { | |
1067 | rfcomm_send_ua(s, dlci); | |
1068 | ||
1069 | if (d->state == BT_CONNECT || d->state == BT_CONFIG) | |
1070 | err = ECONNREFUSED; | |
1071 | else | |
1072 | err = ECONNRESET; | |
1073 | ||
1074 | d->state = BT_CLOSED; | |
1075 | __rfcomm_dlc_close(d, err); | |
1076 | } else | |
1077 | rfcomm_send_dm(s, dlci); | |
1078 | ||
1079 | } else { | |
1080 | rfcomm_send_ua(s, 0); | |
1081 | ||
1082 | if (s->state == BT_CONNECT) | |
1083 | err = ECONNREFUSED; | |
1084 | else | |
1085 | err = ECONNRESET; | |
1086 | ||
1087 | s->state = BT_CLOSED; | |
1088 | rfcomm_session_close(s, err); | |
1089 | } | |
1090 | ||
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | static inline int rfcomm_check_link_mode(struct rfcomm_dlc *d) | |
1095 | { | |
1096 | struct sock *sk = d->session->sock->sk; | |
1097 | ||
1098 | if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) { | |
1099 | if (!hci_conn_encrypt(l2cap_pi(sk)->conn->hcon)) | |
1100 | return 1; | |
1101 | } else if (d->link_mode & RFCOMM_LM_AUTH) { | |
1102 | if (!hci_conn_auth(l2cap_pi(sk)->conn->hcon)) | |
1103 | return 1; | |
1104 | } | |
1105 | ||
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | static void rfcomm_dlc_accept(struct rfcomm_dlc *d) | |
1110 | { | |
1111 | BT_DBG("dlc %p", d); | |
1112 | ||
1113 | rfcomm_send_ua(d->session, d->dlci); | |
1114 | ||
1115 | rfcomm_dlc_lock(d); | |
1116 | d->state = BT_CONNECTED; | |
1117 | d->state_change(d, 0); | |
1118 | rfcomm_dlc_unlock(d); | |
1119 | ||
1120 | rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); | |
1121 | } | |
1122 | ||
1123 | static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci) | |
1124 | { | |
1125 | struct rfcomm_dlc *d; | |
1126 | u8 channel; | |
1127 | ||
1128 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1129 | ||
1130 | if (!dlci) { | |
1131 | rfcomm_send_ua(s, 0); | |
1132 | ||
1133 | if (s->state == BT_OPEN) { | |
1134 | s->state = BT_CONNECTED; | |
1135 | rfcomm_process_connect(s); | |
1136 | } | |
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | /* Check if DLC exists */ | |
1141 | d = rfcomm_dlc_get(s, dlci); | |
1142 | if (d) { | |
1143 | if (d->state == BT_OPEN) { | |
1144 | /* DLC was previously opened by PN request */ | |
1145 | if (rfcomm_check_link_mode(d)) { | |
1146 | set_bit(RFCOMM_AUTH_PENDING, &d->flags); | |
1147 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | rfcomm_dlc_accept(d); | |
1152 | } | |
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | /* Notify socket layer about incoming connection */ | |
1157 | channel = __srv_channel(dlci); | |
1158 | if (rfcomm_connect_ind(s, channel, &d)) { | |
1159 | d->dlci = dlci; | |
1160 | d->addr = __addr(s->initiator, dlci); | |
1161 | rfcomm_dlc_link(s, d); | |
1162 | ||
1163 | if (rfcomm_check_link_mode(d)) { | |
1164 | set_bit(RFCOMM_AUTH_PENDING, &d->flags); | |
1165 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); | |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | rfcomm_dlc_accept(d); | |
1170 | } else { | |
1171 | rfcomm_send_dm(s, dlci); | |
1172 | } | |
1173 | ||
1174 | return 0; | |
1175 | } | |
1176 | ||
1177 | static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn) | |
1178 | { | |
1179 | struct rfcomm_session *s = d->session; | |
1180 | ||
1181 | BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d", | |
1182 | d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits); | |
1183 | ||
1184 | if (pn->flow_ctrl == 0xf0 || pn->flow_ctrl == 0xe0) { | |
1185 | d->cfc = s->cfc = RFCOMM_CFC_ENABLED; | |
1186 | d->tx_credits = pn->credits; | |
1187 | } else { | |
1188 | d->cfc = s->cfc = RFCOMM_CFC_DISABLED; | |
1189 | set_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1190 | } | |
1191 | ||
1192 | d->priority = pn->priority; | |
1193 | ||
1194 | d->mtu = s->mtu = btohs(pn->mtu); | |
1195 | ||
1196 | return 0; | |
1197 | } | |
1198 | ||
1199 | static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb) | |
1200 | { | |
1201 | struct rfcomm_pn *pn = (void *) skb->data; | |
1202 | struct rfcomm_dlc *d; | |
1203 | u8 dlci = pn->dlci; | |
1204 | ||
1205 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1206 | ||
1207 | if (!dlci) | |
1208 | return 0; | |
1209 | ||
1210 | d = rfcomm_dlc_get(s, dlci); | |
1211 | if (d) { | |
1212 | if (cr) { | |
1213 | /* PN request */ | |
1214 | rfcomm_apply_pn(d, cr, pn); | |
1215 | rfcomm_send_pn(s, 0, d); | |
1216 | } else { | |
1217 | /* PN response */ | |
1218 | switch (d->state) { | |
1219 | case BT_CONFIG: | |
1220 | rfcomm_apply_pn(d, cr, pn); | |
1221 | ||
1222 | d->state = BT_CONNECT; | |
1223 | rfcomm_send_sabm(s, d->dlci); | |
1224 | break; | |
1225 | } | |
1226 | } | |
1227 | } else { | |
1228 | u8 channel = __srv_channel(dlci); | |
1229 | ||
1230 | if (!cr) | |
1231 | return 0; | |
1232 | ||
1233 | /* PN request for non existing DLC. | |
1234 | * Assume incoming connection. */ | |
1235 | if (rfcomm_connect_ind(s, channel, &d)) { | |
1236 | d->dlci = dlci; | |
1237 | d->addr = __addr(s->initiator, dlci); | |
1238 | rfcomm_dlc_link(s, d); | |
1239 | ||
1240 | rfcomm_apply_pn(d, cr, pn); | |
1241 | ||
1242 | d->state = BT_OPEN; | |
1243 | rfcomm_send_pn(s, 0, d); | |
1244 | } else { | |
1245 | rfcomm_send_dm(s, dlci); | |
1246 | } | |
1247 | } | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb) | |
1252 | { | |
1253 | struct rfcomm_rpn *rpn = (void *) skb->data; | |
1254 | u8 dlci = __get_dlci(rpn->dlci); | |
1255 | ||
1256 | u8 bit_rate = 0; | |
1257 | u8 data_bits = 0; | |
1258 | u8 stop_bits = 0; | |
1259 | u8 parity = 0; | |
1260 | u8 flow_ctrl = 0; | |
1261 | u8 xon_char = 0; | |
1262 | u8 xoff_char = 0; | |
1263 | u16 rpn_mask = RFCOMM_RPN_PM_ALL; | |
3a5e903c S |
1264 | |
1265 | 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", | |
1266 | dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl, | |
1267 | rpn->xon_char, rpn->xoff_char, rpn->param_mask); | |
1268 | ||
1269 | if (!cr) | |
1da177e4 | 1270 | return 0; |
3a5e903c | 1271 | |
1da177e4 | 1272 | if (len == 1) { |
3a5e903c | 1273 | /* This is a request, return default settings */ |
1da177e4 LT |
1274 | bit_rate = RFCOMM_RPN_BR_115200; |
1275 | data_bits = RFCOMM_RPN_DATA_8; | |
1276 | stop_bits = RFCOMM_RPN_STOP_1; | |
1277 | parity = RFCOMM_RPN_PARITY_NONE; | |
1278 | flow_ctrl = RFCOMM_RPN_FLOW_NONE; | |
1279 | xon_char = RFCOMM_RPN_XON_CHAR; | |
1280 | xoff_char = RFCOMM_RPN_XOFF_CHAR; | |
1da177e4 LT |
1281 | goto rpn_out; |
1282 | } | |
3a5e903c S |
1283 | |
1284 | /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit, | |
1285 | * no parity, no flow control lines, normal XON/XOFF chars */ | |
1286 | ||
1da177e4 LT |
1287 | if (rpn->param_mask & RFCOMM_RPN_PM_BITRATE) { |
1288 | bit_rate = rpn->bit_rate; | |
1289 | if (bit_rate != RFCOMM_RPN_BR_115200) { | |
1290 | BT_DBG("RPN bit rate mismatch 0x%x", bit_rate); | |
1291 | bit_rate = RFCOMM_RPN_BR_115200; | |
1292 | rpn_mask ^= RFCOMM_RPN_PM_BITRATE; | |
1293 | } | |
1294 | } | |
3a5e903c | 1295 | |
1da177e4 LT |
1296 | if (rpn->param_mask & RFCOMM_RPN_PM_DATA) { |
1297 | data_bits = __get_rpn_data_bits(rpn->line_settings); | |
1298 | if (data_bits != RFCOMM_RPN_DATA_8) { | |
1299 | BT_DBG("RPN data bits mismatch 0x%x", data_bits); | |
1300 | data_bits = RFCOMM_RPN_DATA_8; | |
1301 | rpn_mask ^= RFCOMM_RPN_PM_DATA; | |
1302 | } | |
1303 | } | |
3a5e903c | 1304 | |
1da177e4 LT |
1305 | if (rpn->param_mask & RFCOMM_RPN_PM_STOP) { |
1306 | stop_bits = __get_rpn_stop_bits(rpn->line_settings); | |
1307 | if (stop_bits != RFCOMM_RPN_STOP_1) { | |
1308 | BT_DBG("RPN stop bits mismatch 0x%x", stop_bits); | |
1309 | stop_bits = RFCOMM_RPN_STOP_1; | |
1310 | rpn_mask ^= RFCOMM_RPN_PM_STOP; | |
1311 | } | |
1312 | } | |
3a5e903c | 1313 | |
1da177e4 LT |
1314 | if (rpn->param_mask & RFCOMM_RPN_PM_PARITY) { |
1315 | parity = __get_rpn_parity(rpn->line_settings); | |
1316 | if (parity != RFCOMM_RPN_PARITY_NONE) { | |
1317 | BT_DBG("RPN parity mismatch 0x%x", parity); | |
1318 | parity = RFCOMM_RPN_PARITY_NONE; | |
1319 | rpn_mask ^= RFCOMM_RPN_PM_PARITY; | |
1320 | } | |
1321 | } | |
3a5e903c | 1322 | |
1da177e4 LT |
1323 | if (rpn->param_mask & RFCOMM_RPN_PM_FLOW) { |
1324 | flow_ctrl = rpn->flow_ctrl; | |
1325 | if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) { | |
1326 | BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl); | |
1327 | flow_ctrl = RFCOMM_RPN_FLOW_NONE; | |
1328 | rpn_mask ^= RFCOMM_RPN_PM_FLOW; | |
1329 | } | |
1330 | } | |
3a5e903c | 1331 | |
1da177e4 LT |
1332 | if (rpn->param_mask & RFCOMM_RPN_PM_XON) { |
1333 | xon_char = rpn->xon_char; | |
1334 | if (xon_char != RFCOMM_RPN_XON_CHAR) { | |
1335 | BT_DBG("RPN XON char mismatch 0x%x", xon_char); | |
1336 | xon_char = RFCOMM_RPN_XON_CHAR; | |
1337 | rpn_mask ^= RFCOMM_RPN_PM_XON; | |
1338 | } | |
1339 | } | |
3a5e903c | 1340 | |
1da177e4 LT |
1341 | if (rpn->param_mask & RFCOMM_RPN_PM_XOFF) { |
1342 | xoff_char = rpn->xoff_char; | |
1343 | if (xoff_char != RFCOMM_RPN_XOFF_CHAR) { | |
1344 | BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char); | |
1345 | xoff_char = RFCOMM_RPN_XOFF_CHAR; | |
1346 | rpn_mask ^= RFCOMM_RPN_PM_XOFF; | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | rpn_out: | |
3a5e903c S |
1351 | rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits, |
1352 | parity, flow_ctrl, xon_char, xoff_char, rpn_mask); | |
1da177e4 LT |
1353 | |
1354 | return 0; | |
1355 | } | |
1356 | ||
1357 | static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb) | |
1358 | { | |
1359 | struct rfcomm_rls *rls = (void *) skb->data; | |
1360 | u8 dlci = __get_dlci(rls->dlci); | |
1361 | ||
1362 | BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status); | |
3a5e903c | 1363 | |
1da177e4 LT |
1364 | if (!cr) |
1365 | return 0; | |
1366 | ||
3a5e903c S |
1367 | /* We should probably do something with this information here. But |
1368 | * for now it's sufficient just to reply -- Bluetooth 1.1 says it's | |
1369 | * mandatory to recognise and respond to RLS */ | |
1da177e4 LT |
1370 | |
1371 | rfcomm_send_rls(s, 0, dlci, rls->status); | |
1372 | ||
1373 | return 0; | |
1374 | } | |
1375 | ||
1376 | static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb) | |
1377 | { | |
1378 | struct rfcomm_msc *msc = (void *) skb->data; | |
1379 | struct rfcomm_dlc *d; | |
1380 | u8 dlci = __get_dlci(msc->dlci); | |
1381 | ||
1382 | BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig); | |
1383 | ||
1384 | d = rfcomm_dlc_get(s, dlci); | |
3a5e903c | 1385 | if (!d) |
1da177e4 LT |
1386 | return 0; |
1387 | ||
1388 | if (cr) { | |
1389 | if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc) | |
1390 | set_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1391 | else | |
1392 | clear_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
3a5e903c | 1393 | |
1da177e4 LT |
1394 | rfcomm_dlc_lock(d); |
1395 | if (d->modem_status) | |
1396 | d->modem_status(d, msc->v24_sig); | |
1397 | rfcomm_dlc_unlock(d); | |
1398 | ||
1399 | rfcomm_send_msc(s, 0, dlci, msc->v24_sig); | |
1400 | ||
1401 | d->mscex |= RFCOMM_MSCEX_RX; | |
3a5e903c | 1402 | } else |
1da177e4 LT |
1403 | d->mscex |= RFCOMM_MSCEX_TX; |
1404 | ||
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb) | |
1409 | { | |
1410 | struct rfcomm_mcc *mcc = (void *) skb->data; | |
1411 | u8 type, cr, len; | |
1412 | ||
1413 | cr = __test_cr(mcc->type); | |
1414 | type = __get_mcc_type(mcc->type); | |
1415 | len = __get_mcc_len(mcc->len); | |
1416 | ||
1417 | BT_DBG("%p type 0x%x cr %d", s, type, cr); | |
1418 | ||
1419 | skb_pull(skb, 2); | |
1420 | ||
1421 | switch (type) { | |
1422 | case RFCOMM_PN: | |
1423 | rfcomm_recv_pn(s, cr, skb); | |
1424 | break; | |
1425 | ||
1426 | case RFCOMM_RPN: | |
1427 | rfcomm_recv_rpn(s, cr, len, skb); | |
1428 | break; | |
1429 | ||
1430 | case RFCOMM_RLS: | |
1431 | rfcomm_recv_rls(s, cr, skb); | |
1432 | break; | |
1433 | ||
1434 | case RFCOMM_MSC: | |
1435 | rfcomm_recv_msc(s, cr, skb); | |
1436 | break; | |
1437 | ||
1438 | case RFCOMM_FCOFF: | |
1439 | if (cr) { | |
1440 | set_bit(RFCOMM_TX_THROTTLED, &s->flags); | |
1441 | rfcomm_send_fcoff(s, 0); | |
1442 | } | |
1443 | break; | |
1444 | ||
1445 | case RFCOMM_FCON: | |
1446 | if (cr) { | |
1447 | clear_bit(RFCOMM_TX_THROTTLED, &s->flags); | |
1448 | rfcomm_send_fcon(s, 0); | |
1449 | } | |
1450 | break; | |
1451 | ||
1452 | case RFCOMM_TEST: | |
1453 | if (cr) | |
1454 | rfcomm_send_test(s, 0, skb->data, skb->len); | |
1455 | break; | |
1456 | ||
1457 | case RFCOMM_NSC: | |
1458 | break; | |
1459 | ||
1460 | default: | |
1461 | BT_ERR("Unknown control type 0x%02x", type); | |
1462 | rfcomm_send_nsc(s, cr, type); | |
1463 | break; | |
1464 | } | |
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb) | |
1469 | { | |
1470 | struct rfcomm_dlc *d; | |
1471 | ||
1472 | BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf); | |
1473 | ||
1474 | d = rfcomm_dlc_get(s, dlci); | |
1475 | if (!d) { | |
1476 | rfcomm_send_dm(s, dlci); | |
1477 | goto drop; | |
1478 | } | |
1479 | ||
1480 | if (pf && d->cfc) { | |
1481 | u8 credits = *(u8 *) skb->data; skb_pull(skb, 1); | |
1482 | ||
1483 | d->tx_credits += credits; | |
1484 | if (d->tx_credits) | |
1485 | clear_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1486 | } | |
1487 | ||
1488 | if (skb->len && d->state == BT_CONNECTED) { | |
1489 | rfcomm_dlc_lock(d); | |
1490 | d->rx_credits--; | |
1491 | d->data_ready(d, skb); | |
1492 | rfcomm_dlc_unlock(d); | |
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | drop: | |
1497 | kfree_skb(skb); | |
1498 | return 0; | |
1499 | } | |
1500 | ||
1501 | static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb) | |
1502 | { | |
1503 | struct rfcomm_hdr *hdr = (void *) skb->data; | |
1504 | u8 type, dlci, fcs; | |
1505 | ||
1506 | dlci = __get_dlci(hdr->addr); | |
1507 | type = __get_type(hdr->ctrl); | |
1508 | ||
1509 | /* Trim FCS */ | |
1510 | skb->len--; skb->tail--; | |
1511 | fcs = *(u8 *) skb->tail; | |
1512 | ||
1513 | if (__check_fcs(skb->data, type, fcs)) { | |
1514 | BT_ERR("bad checksum in packet"); | |
1515 | kfree_skb(skb); | |
1516 | return -EILSEQ; | |
1517 | } | |
1518 | ||
1519 | if (__test_ea(hdr->len)) | |
1520 | skb_pull(skb, 3); | |
1521 | else | |
1522 | skb_pull(skb, 4); | |
1523 | ||
1524 | switch (type) { | |
1525 | case RFCOMM_SABM: | |
1526 | if (__test_pf(hdr->ctrl)) | |
1527 | rfcomm_recv_sabm(s, dlci); | |
1528 | break; | |
1529 | ||
1530 | case RFCOMM_DISC: | |
1531 | if (__test_pf(hdr->ctrl)) | |
1532 | rfcomm_recv_disc(s, dlci); | |
1533 | break; | |
1534 | ||
1535 | case RFCOMM_UA: | |
1536 | if (__test_pf(hdr->ctrl)) | |
1537 | rfcomm_recv_ua(s, dlci); | |
1538 | break; | |
1539 | ||
1540 | case RFCOMM_DM: | |
1541 | rfcomm_recv_dm(s, dlci); | |
1542 | break; | |
1543 | ||
1544 | case RFCOMM_UIH: | |
1545 | if (dlci) | |
1546 | return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb); | |
1547 | ||
1548 | rfcomm_recv_mcc(s, skb); | |
1549 | break; | |
1550 | ||
1551 | default: | |
1552 | BT_ERR("Unknown packet type 0x%02x\n", type); | |
1553 | break; | |
1554 | } | |
1555 | kfree_skb(skb); | |
1556 | return 0; | |
1557 | } | |
1558 | ||
1559 | /* ---- Connection and data processing ---- */ | |
1560 | ||
1561 | static void rfcomm_process_connect(struct rfcomm_session *s) | |
1562 | { | |
1563 | struct rfcomm_dlc *d; | |
1564 | struct list_head *p, *n; | |
1565 | ||
1566 | BT_DBG("session %p state %ld", s, s->state); | |
1567 | ||
1568 | list_for_each_safe(p, n, &s->dlcs) { | |
1569 | d = list_entry(p, struct rfcomm_dlc, list); | |
1570 | if (d->state == BT_CONFIG) { | |
1571 | d->mtu = s->mtu; | |
1572 | rfcomm_send_pn(s, 1, d); | |
1573 | } | |
1574 | } | |
1575 | } | |
1576 | ||
1577 | /* Send data queued for the DLC. | |
1578 | * Return number of frames left in the queue. | |
1579 | */ | |
1580 | static inline int rfcomm_process_tx(struct rfcomm_dlc *d) | |
1581 | { | |
1582 | struct sk_buff *skb; | |
1583 | int err; | |
1584 | ||
1585 | BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d", | |
1586 | d, d->state, d->cfc, d->rx_credits, d->tx_credits); | |
1587 | ||
1588 | /* Send pending MSC */ | |
1589 | if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags)) | |
1590 | rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); | |
1591 | ||
1592 | if (d->cfc) { | |
1593 | /* CFC enabled. | |
1594 | * Give them some credits */ | |
1595 | if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) && | |
1596 | d->rx_credits <= (d->cfc >> 2)) { | |
1597 | rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits); | |
1598 | d->rx_credits = d->cfc; | |
1599 | } | |
1600 | } else { | |
1601 | /* CFC disabled. | |
1602 | * Give ourselves some credits */ | |
1603 | d->tx_credits = 5; | |
1604 | } | |
1605 | ||
1606 | if (test_bit(RFCOMM_TX_THROTTLED, &d->flags)) | |
1607 | return skb_queue_len(&d->tx_queue); | |
1608 | ||
1609 | while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) { | |
1610 | err = rfcomm_send_frame(d->session, skb->data, skb->len); | |
1611 | if (err < 0) { | |
1612 | skb_queue_head(&d->tx_queue, skb); | |
1613 | break; | |
1614 | } | |
1615 | kfree_skb(skb); | |
1616 | d->tx_credits--; | |
1617 | } | |
1618 | ||
1619 | if (d->cfc && !d->tx_credits) { | |
1620 | /* We're out of TX credits. | |
1621 | * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */ | |
1622 | set_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1623 | } | |
1624 | ||
1625 | return skb_queue_len(&d->tx_queue); | |
1626 | } | |
1627 | ||
1628 | static inline void rfcomm_process_dlcs(struct rfcomm_session *s) | |
1629 | { | |
1630 | struct rfcomm_dlc *d; | |
1631 | struct list_head *p, *n; | |
1632 | ||
1633 | BT_DBG("session %p state %ld", s, s->state); | |
1634 | ||
1635 | list_for_each_safe(p, n, &s->dlcs) { | |
1636 | d = list_entry(p, struct rfcomm_dlc, list); | |
1637 | ||
1638 | if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) { | |
1639 | __rfcomm_dlc_close(d, ETIMEDOUT); | |
1640 | continue; | |
1641 | } | |
1642 | ||
1643 | if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) { | |
1644 | rfcomm_dlc_clear_timer(d); | |
1645 | rfcomm_dlc_accept(d); | |
1646 | if (d->link_mode & RFCOMM_LM_SECURE) { | |
1647 | struct sock *sk = s->sock->sk; | |
1648 | hci_conn_change_link_key(l2cap_pi(sk)->conn->hcon); | |
1649 | } | |
1650 | continue; | |
1651 | } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) { | |
1652 | rfcomm_dlc_clear_timer(d); | |
1653 | rfcomm_send_dm(s, d->dlci); | |
1654 | __rfcomm_dlc_close(d, ECONNREFUSED); | |
1655 | continue; | |
1656 | } | |
1657 | ||
1658 | if (test_bit(RFCOMM_TX_THROTTLED, &s->flags)) | |
1659 | continue; | |
1660 | ||
1661 | if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) && | |
1662 | d->mscex == RFCOMM_MSCEX_OK) | |
1663 | rfcomm_process_tx(d); | |
1664 | } | |
1665 | } | |
1666 | ||
1667 | static inline void rfcomm_process_rx(struct rfcomm_session *s) | |
1668 | { | |
1669 | struct socket *sock = s->sock; | |
1670 | struct sock *sk = sock->sk; | |
1671 | struct sk_buff *skb; | |
1672 | ||
1673 | BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue)); | |
1674 | ||
1675 | /* Get data directly from socket receive queue without copying it. */ | |
1676 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) { | |
1677 | skb_orphan(skb); | |
1678 | rfcomm_recv_frame(s, skb); | |
1679 | } | |
1680 | ||
1681 | if (sk->sk_state == BT_CLOSED) { | |
1682 | if (!s->initiator) | |
1683 | rfcomm_session_put(s); | |
1684 | ||
1685 | rfcomm_session_close(s, sk->sk_err); | |
1686 | } | |
1687 | } | |
1688 | ||
1689 | static inline void rfcomm_accept_connection(struct rfcomm_session *s) | |
1690 | { | |
1691 | struct socket *sock = s->sock, *nsock; | |
1692 | int err; | |
1693 | ||
1694 | /* Fast check for a new connection. | |
1695 | * Avoids unnesesary socket allocations. */ | |
1696 | if (list_empty(&bt_sk(sock->sk)->accept_q)) | |
1697 | return; | |
1698 | ||
1699 | BT_DBG("session %p", s); | |
1700 | ||
1701 | if (sock_create_lite(PF_BLUETOOTH, sock->type, BTPROTO_L2CAP, &nsock)) | |
1702 | return; | |
1703 | ||
1704 | nsock->ops = sock->ops; | |
1705 | ||
1706 | __module_get(nsock->ops->owner); | |
1707 | ||
1708 | err = sock->ops->accept(sock, nsock, O_NONBLOCK); | |
1709 | if (err < 0) { | |
1710 | sock_release(nsock); | |
1711 | return; | |
1712 | } | |
1713 | ||
1714 | /* Set our callbacks */ | |
1715 | nsock->sk->sk_data_ready = rfcomm_l2data_ready; | |
1716 | nsock->sk->sk_state_change = rfcomm_l2state_change; | |
1717 | ||
1718 | s = rfcomm_session_add(nsock, BT_OPEN); | |
1719 | if (s) { | |
1720 | rfcomm_session_hold(s); | |
1721 | rfcomm_schedule(RFCOMM_SCHED_RX); | |
1722 | } else | |
1723 | sock_release(nsock); | |
1724 | } | |
1725 | ||
1726 | static inline void rfcomm_check_connection(struct rfcomm_session *s) | |
1727 | { | |
1728 | struct sock *sk = s->sock->sk; | |
1729 | ||
1730 | BT_DBG("%p state %ld", s, s->state); | |
1731 | ||
1732 | switch(sk->sk_state) { | |
1733 | case BT_CONNECTED: | |
1734 | s->state = BT_CONNECT; | |
1735 | ||
1736 | /* We can adjust MTU on outgoing sessions. | |
1737 | * L2CAP MTU minus UIH header and FCS. */ | |
1738 | s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5; | |
1739 | ||
1740 | rfcomm_send_sabm(s, 0); | |
1741 | break; | |
1742 | ||
1743 | case BT_CLOSED: | |
1744 | s->state = BT_CLOSED; | |
1745 | rfcomm_session_close(s, sk->sk_err); | |
1746 | break; | |
1747 | } | |
1748 | } | |
1749 | ||
1750 | static inline void rfcomm_process_sessions(void) | |
1751 | { | |
1752 | struct list_head *p, *n; | |
1753 | ||
1754 | rfcomm_lock(); | |
1755 | ||
1756 | list_for_each_safe(p, n, &session_list) { | |
1757 | struct rfcomm_session *s; | |
1758 | s = list_entry(p, struct rfcomm_session, list); | |
1759 | ||
1760 | if (s->state == BT_LISTEN) { | |
1761 | rfcomm_accept_connection(s); | |
1762 | continue; | |
1763 | } | |
1764 | ||
1765 | rfcomm_session_hold(s); | |
1766 | ||
1767 | switch (s->state) { | |
1768 | case BT_BOUND: | |
1769 | rfcomm_check_connection(s); | |
1770 | break; | |
1771 | ||
1772 | default: | |
1773 | rfcomm_process_rx(s); | |
1774 | break; | |
1775 | } | |
1776 | ||
1777 | rfcomm_process_dlcs(s); | |
1778 | ||
1779 | rfcomm_session_put(s); | |
1780 | } | |
1781 | ||
1782 | rfcomm_unlock(); | |
1783 | } | |
1784 | ||
1785 | static void rfcomm_worker(void) | |
1786 | { | |
1787 | BT_DBG(""); | |
1788 | ||
1789 | while (!atomic_read(&terminate)) { | |
1790 | if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) { | |
1791 | /* No pending events. Let's sleep. | |
1792 | * Incoming connections and data will wake us up. */ | |
1793 | set_current_state(TASK_INTERRUPTIBLE); | |
1794 | schedule(); | |
1795 | } | |
1796 | ||
1797 | /* Process stuff */ | |
1798 | clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event); | |
1799 | rfcomm_process_sessions(); | |
1800 | } | |
1801 | set_current_state(TASK_RUNNING); | |
1802 | return; | |
1803 | } | |
1804 | ||
1805 | static int rfcomm_add_listener(bdaddr_t *ba) | |
1806 | { | |
1807 | struct sockaddr_l2 addr; | |
1808 | struct socket *sock; | |
1809 | struct sock *sk; | |
1810 | struct rfcomm_session *s; | |
1811 | int err = 0; | |
1812 | ||
1813 | /* Create socket */ | |
1814 | err = rfcomm_l2sock_create(&sock); | |
1815 | if (err < 0) { | |
1816 | BT_ERR("Create socket failed %d", err); | |
1817 | return err; | |
1818 | } | |
1819 | ||
1820 | /* Bind socket */ | |
1821 | bacpy(&addr.l2_bdaddr, ba); | |
1822 | addr.l2_family = AF_BLUETOOTH; | |
1823 | addr.l2_psm = htobs(RFCOMM_PSM); | |
1824 | err = sock->ops->bind(sock, (struct sockaddr *) &addr, sizeof(addr)); | |
1825 | if (err < 0) { | |
1826 | BT_ERR("Bind failed %d", err); | |
1827 | goto failed; | |
1828 | } | |
1829 | ||
1830 | /* Set L2CAP options */ | |
1831 | sk = sock->sk; | |
1832 | lock_sock(sk); | |
1833 | l2cap_pi(sk)->imtu = RFCOMM_MAX_L2CAP_MTU; | |
1834 | release_sock(sk); | |
1835 | ||
1836 | /* Start listening on the socket */ | |
1837 | err = sock->ops->listen(sock, 10); | |
1838 | if (err) { | |
1839 | BT_ERR("Listen failed %d", err); | |
1840 | goto failed; | |
1841 | } | |
1842 | ||
1843 | /* Add listening session */ | |
1844 | s = rfcomm_session_add(sock, BT_LISTEN); | |
1845 | if (!s) | |
1846 | goto failed; | |
1847 | ||
1848 | rfcomm_session_hold(s); | |
1849 | return 0; | |
1850 | failed: | |
1851 | sock_release(sock); | |
1852 | return err; | |
1853 | } | |
1854 | ||
1855 | static void rfcomm_kill_listener(void) | |
1856 | { | |
1857 | struct rfcomm_session *s; | |
1858 | struct list_head *p, *n; | |
1859 | ||
1860 | BT_DBG(""); | |
1861 | ||
1862 | list_for_each_safe(p, n, &session_list) { | |
1863 | s = list_entry(p, struct rfcomm_session, list); | |
1864 | rfcomm_session_del(s); | |
1865 | } | |
1866 | } | |
1867 | ||
1868 | static int rfcomm_run(void *unused) | |
1869 | { | |
1870 | rfcomm_thread = current; | |
1871 | ||
1872 | atomic_inc(&running); | |
1873 | ||
1874 | daemonize("krfcommd"); | |
1875 | set_user_nice(current, -10); | |
1876 | current->flags |= PF_NOFREEZE; | |
1877 | ||
1878 | BT_DBG(""); | |
1879 | ||
1880 | rfcomm_add_listener(BDADDR_ANY); | |
1881 | ||
1882 | rfcomm_worker(); | |
1883 | ||
1884 | rfcomm_kill_listener(); | |
1885 | ||
1886 | atomic_dec(&running); | |
1887 | return 0; | |
1888 | } | |
1889 | ||
1890 | static void rfcomm_auth_cfm(struct hci_conn *conn, u8 status) | |
1891 | { | |
1892 | struct rfcomm_session *s; | |
1893 | struct rfcomm_dlc *d; | |
1894 | struct list_head *p, *n; | |
1895 | ||
1896 | BT_DBG("conn %p status 0x%02x", conn, status); | |
1897 | ||
1898 | s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst); | |
1899 | if (!s) | |
1900 | return; | |
1901 | ||
1902 | rfcomm_session_hold(s); | |
1903 | ||
1904 | list_for_each_safe(p, n, &s->dlcs) { | |
1905 | d = list_entry(p, struct rfcomm_dlc, list); | |
1906 | ||
1907 | if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) | |
1908 | continue; | |
1909 | ||
1910 | if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags)) | |
1911 | continue; | |
1912 | ||
1913 | if (!status) | |
1914 | set_bit(RFCOMM_AUTH_ACCEPT, &d->flags); | |
1915 | else | |
1916 | set_bit(RFCOMM_AUTH_REJECT, &d->flags); | |
1917 | } | |
1918 | ||
1919 | rfcomm_session_put(s); | |
1920 | ||
1921 | rfcomm_schedule(RFCOMM_SCHED_AUTH); | |
1922 | } | |
1923 | ||
1924 | static void rfcomm_encrypt_cfm(struct hci_conn *conn, u8 status, u8 encrypt) | |
1925 | { | |
1926 | struct rfcomm_session *s; | |
1927 | struct rfcomm_dlc *d; | |
1928 | struct list_head *p, *n; | |
1929 | ||
1930 | BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt); | |
1931 | ||
1932 | s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst); | |
1933 | if (!s) | |
1934 | return; | |
1935 | ||
1936 | rfcomm_session_hold(s); | |
1937 | ||
1938 | list_for_each_safe(p, n, &s->dlcs) { | |
1939 | d = list_entry(p, struct rfcomm_dlc, list); | |
1940 | ||
1941 | if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags)) | |
1942 | continue; | |
1943 | ||
1944 | if (!status && encrypt) | |
1945 | set_bit(RFCOMM_AUTH_ACCEPT, &d->flags); | |
1946 | else | |
1947 | set_bit(RFCOMM_AUTH_REJECT, &d->flags); | |
1948 | } | |
1949 | ||
1950 | rfcomm_session_put(s); | |
1951 | ||
1952 | rfcomm_schedule(RFCOMM_SCHED_AUTH); | |
1953 | } | |
1954 | ||
1955 | static struct hci_cb rfcomm_cb = { | |
1956 | .name = "RFCOMM", | |
1957 | .auth_cfm = rfcomm_auth_cfm, | |
1958 | .encrypt_cfm = rfcomm_encrypt_cfm | |
1959 | }; | |
1960 | ||
1961 | /* ---- Proc fs support ---- */ | |
1962 | #ifdef CONFIG_PROC_FS | |
1963 | static void *rfcomm_seq_start(struct seq_file *seq, loff_t *pos) | |
1964 | { | |
1965 | struct rfcomm_session *s; | |
1966 | struct list_head *pp, *p; | |
1967 | loff_t l = *pos; | |
1968 | ||
1969 | rfcomm_lock(); | |
1970 | ||
1971 | list_for_each(p, &session_list) { | |
1972 | s = list_entry(p, struct rfcomm_session, list); | |
1973 | list_for_each(pp, &s->dlcs) | |
1974 | if (!l--) { | |
1975 | seq->private = s; | |
1976 | return pp; | |
1977 | } | |
1978 | } | |
1979 | return NULL; | |
1980 | } | |
1981 | ||
1982 | static void *rfcomm_seq_next(struct seq_file *seq, void *e, loff_t *pos) | |
1983 | { | |
1984 | struct rfcomm_session *s = seq->private; | |
1985 | struct list_head *pp, *p = e; | |
1986 | (*pos)++; | |
1987 | ||
1988 | if (p->next != &s->dlcs) | |
1989 | return p->next; | |
1990 | ||
1991 | list_for_each(p, &session_list) { | |
1992 | s = list_entry(p, struct rfcomm_session, list); | |
1993 | __list_for_each(pp, &s->dlcs) { | |
1994 | seq->private = s; | |
1995 | return pp; | |
1996 | } | |
1997 | } | |
1998 | return NULL; | |
1999 | } | |
2000 | ||
2001 | static void rfcomm_seq_stop(struct seq_file *seq, void *e) | |
2002 | { | |
2003 | rfcomm_unlock(); | |
2004 | } | |
2005 | ||
2006 | static int rfcomm_seq_show(struct seq_file *seq, void *e) | |
2007 | { | |
2008 | struct rfcomm_session *s = seq->private; | |
2009 | struct sock *sk = s->sock->sk; | |
2010 | struct rfcomm_dlc *d = list_entry(e, struct rfcomm_dlc, list); | |
2011 | ||
2012 | seq_printf(seq, "%s %s %ld %d %d %d %d\n", | |
2013 | batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), | |
2014 | d->state, d->dlci, d->mtu, d->rx_credits, d->tx_credits); | |
2015 | return 0; | |
2016 | } | |
2017 | ||
2018 | static struct seq_operations rfcomm_seq_ops = { | |
2019 | .start = rfcomm_seq_start, | |
2020 | .next = rfcomm_seq_next, | |
2021 | .stop = rfcomm_seq_stop, | |
2022 | .show = rfcomm_seq_show | |
2023 | }; | |
2024 | ||
2025 | static int rfcomm_seq_open(struct inode *inode, struct file *file) | |
2026 | { | |
2027 | return seq_open(file, &rfcomm_seq_ops); | |
2028 | } | |
2029 | ||
2030 | static struct file_operations rfcomm_seq_fops = { | |
2031 | .owner = THIS_MODULE, | |
2032 | .open = rfcomm_seq_open, | |
2033 | .read = seq_read, | |
2034 | .llseek = seq_lseek, | |
2035 | .release = seq_release, | |
2036 | }; | |
2037 | ||
2038 | static int __init rfcomm_proc_init(void) | |
2039 | { | |
2040 | struct proc_dir_entry *p; | |
2041 | ||
2042 | proc_bt_rfcomm = proc_mkdir("rfcomm", proc_bt); | |
2043 | if (proc_bt_rfcomm) { | |
2044 | proc_bt_rfcomm->owner = THIS_MODULE; | |
2045 | ||
2046 | p = create_proc_entry("dlc", S_IRUGO, proc_bt_rfcomm); | |
2047 | if (p) | |
2048 | p->proc_fops = &rfcomm_seq_fops; | |
2049 | } | |
2050 | return 0; | |
2051 | } | |
2052 | ||
2053 | static void __exit rfcomm_proc_cleanup(void) | |
2054 | { | |
2055 | remove_proc_entry("dlc", proc_bt_rfcomm); | |
2056 | ||
2057 | remove_proc_entry("rfcomm", proc_bt); | |
2058 | } | |
2059 | ||
2060 | #else /* CONFIG_PROC_FS */ | |
2061 | ||
2062 | static int __init rfcomm_proc_init(void) | |
2063 | { | |
2064 | return 0; | |
2065 | } | |
2066 | ||
2067 | static void __exit rfcomm_proc_cleanup(void) | |
2068 | { | |
2069 | return; | |
2070 | } | |
2071 | #endif /* CONFIG_PROC_FS */ | |
2072 | ||
2073 | /* ---- Initialization ---- */ | |
2074 | static int __init rfcomm_init(void) | |
2075 | { | |
2076 | l2cap_load(); | |
2077 | ||
2078 | hci_register_cb(&rfcomm_cb); | |
2079 | ||
2080 | kernel_thread(rfcomm_run, NULL, CLONE_KERNEL); | |
2081 | ||
2082 | BT_INFO("RFCOMM ver %s", VERSION); | |
2083 | ||
2084 | rfcomm_proc_init(); | |
2085 | ||
2086 | rfcomm_init_sockets(); | |
2087 | ||
2088 | #ifdef CONFIG_BT_RFCOMM_TTY | |
2089 | rfcomm_init_ttys(); | |
2090 | #endif | |
2091 | ||
2092 | return 0; | |
2093 | } | |
2094 | ||
2095 | static void __exit rfcomm_exit(void) | |
2096 | { | |
2097 | hci_unregister_cb(&rfcomm_cb); | |
2098 | ||
2099 | /* Terminate working thread. | |
2100 | * ie. Set terminate flag and wake it up */ | |
2101 | atomic_inc(&terminate); | |
2102 | rfcomm_schedule(RFCOMM_SCHED_STATE); | |
2103 | ||
2104 | /* Wait until thread is running */ | |
2105 | while (atomic_read(&running)) | |
2106 | schedule(); | |
2107 | ||
2108 | #ifdef CONFIG_BT_RFCOMM_TTY | |
2109 | rfcomm_cleanup_ttys(); | |
2110 | #endif | |
2111 | ||
2112 | rfcomm_cleanup_sockets(); | |
2113 | ||
2114 | rfcomm_proc_cleanup(); | |
2115 | } | |
2116 | ||
2117 | module_init(rfcomm_init); | |
2118 | module_exit(rfcomm_exit); | |
2119 | ||
2120 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); | |
2121 | MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION); | |
2122 | MODULE_VERSION(VERSION); | |
2123 | MODULE_LICENSE("GPL"); | |
2124 | MODULE_ALIAS("bt-proto-3"); |