1 | /* |
2 | RFCOMM implementation for Linux Bluetooth stack (BlueZ). |
3 | Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> |
4 | Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org> |
5 | |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License version 2 as |
8 | published by the Free Software Foundation; |
9 | |
10 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
11 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
12 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. |
13 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY |
14 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
15 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
16 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
17 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
18 | |
19 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
20 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS |
21 | SOFTWARE IS DISCLAIMED. |
22 | */ |
23 | |
24 | /* |
25 | * Bluetooth RFCOMM core. |
26 | */ |
27 | |
28 | #include <linux/module.h> |
29 | #include <linux/debugfs.h> |
30 | #include <linux/kthread.h> |
31 | #include <asm/unaligned.h> |
32 | |
33 | #include <net/bluetooth/bluetooth.h> |
34 | #include <net/bluetooth/hci_core.h> |
35 | #include <net/bluetooth/l2cap.h> |
36 | #include <net/bluetooth/rfcomm.h> |
37 | |
38 | #include <trace/events/sock.h> |
39 | |
40 | #define VERSION "1.11" |
41 | |
42 | static bool disable_cfc; |
43 | static bool l2cap_ertm; |
44 | static int channel_mtu = -1; |
45 | |
46 | static struct task_struct *rfcomm_thread; |
47 | |
48 | static DEFINE_MUTEX(rfcomm_mutex); |
49 | #define rfcomm_lock() mutex_lock(&rfcomm_mutex) |
50 | #define rfcomm_unlock() mutex_unlock(&rfcomm_mutex) |
51 | |
52 | |
53 | static LIST_HEAD(session_list); |
54 | |
55 | static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len); |
56 | static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci); |
57 | static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci); |
58 | static int rfcomm_queue_disc(struct rfcomm_dlc *d); |
59 | static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type); |
60 | static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d); |
61 | static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig); |
62 | static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len); |
63 | static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits); |
64 | static void rfcomm_make_uih(struct sk_buff *skb, u8 addr); |
65 | |
66 | static void rfcomm_process_connect(struct rfcomm_session *s); |
67 | |
68 | static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, |
69 | bdaddr_t *dst, |
70 | u8 sec_level, |
71 | int *err); |
72 | static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst); |
73 | static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s); |
74 | |
75 | /* ---- RFCOMM frame parsing macros ---- */ |
76 | #define __get_dlci(b) ((b & 0xfc) >> 2) |
77 | #define __get_type(b) ((b & 0xef)) |
78 | |
79 | #define __test_ea(b) ((b & 0x01)) |
80 | #define __test_cr(b) (!!(b & 0x02)) |
81 | #define __test_pf(b) (!!(b & 0x10)) |
82 | |
83 | #define __session_dir(s) ((s)->initiator ? 0x00 : 0x01) |
84 | |
85 | #define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01) |
86 | #define __ctrl(type, pf) (((type & 0xef) | (pf << 4))) |
87 | #define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir) |
88 | #define __srv_channel(dlci) (dlci >> 1) |
89 | |
90 | #define __len8(len) (((len) << 1) | 1) |
91 | #define __len16(len) ((len) << 1) |
92 | |
93 | /* MCC macros */ |
94 | #define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01)) |
95 | #define __get_mcc_type(b) ((b & 0xfc) >> 2) |
96 | #define __get_mcc_len(b) ((b & 0xfe) >> 1) |
97 | |
98 | /* RPN macros */ |
99 | #define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3)) |
100 | #define __get_rpn_data_bits(line) ((line) & 0x3) |
101 | #define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1) |
102 | #define __get_rpn_parity(line) (((line) >> 3) & 0x7) |
103 | |
104 | static DECLARE_WAIT_QUEUE_HEAD(rfcomm_wq); |
105 | |
106 | static void rfcomm_schedule(void) |
107 | { |
108 | wake_up_all(&rfcomm_wq); |
109 | } |
110 | |
111 | /* ---- RFCOMM FCS computation ---- */ |
112 | |
113 | /* reversed, 8-bit, poly=0x07 */ |
114 | static unsigned char rfcomm_crc_table[256] = { |
115 | 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75, |
116 | 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b, |
117 | 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69, |
118 | 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67, |
119 | |
120 | 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d, |
121 | 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43, |
122 | 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51, |
123 | 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f, |
124 | |
125 | 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05, |
126 | 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b, |
127 | 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19, |
128 | 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17, |
129 | |
130 | 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d, |
131 | 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33, |
132 | 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21, |
133 | 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f, |
134 | |
135 | 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95, |
136 | 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b, |
137 | 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89, |
138 | 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87, |
139 | |
140 | 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad, |
141 | 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3, |
142 | 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1, |
143 | 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf, |
144 | |
145 | 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5, |
146 | 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb, |
147 | 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9, |
148 | 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7, |
149 | |
150 | 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd, |
151 | 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3, |
152 | 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1, |
153 | 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf |
154 | }; |
155 | |
156 | /* CRC on 2 bytes */ |
157 | #define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]]) |
158 | |
159 | /* FCS on 2 bytes */ |
160 | static inline u8 __fcs(u8 *data) |
161 | { |
162 | return 0xff - __crc(data); |
163 | } |
164 | |
165 | /* FCS on 3 bytes */ |
166 | static inline u8 __fcs2(u8 *data) |
167 | { |
168 | return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]]; |
169 | } |
170 | |
171 | /* Check FCS */ |
172 | static inline int __check_fcs(u8 *data, int type, u8 fcs) |
173 | { |
174 | u8 f = __crc(data); |
175 | |
176 | if (type != RFCOMM_UIH) |
177 | f = rfcomm_crc_table[f ^ data[2]]; |
178 | |
179 | return rfcomm_crc_table[f ^ fcs] != 0xcf; |
180 | } |
181 | |
182 | /* ---- L2CAP callbacks ---- */ |
183 | static void rfcomm_l2state_change(struct sock *sk) |
184 | { |
185 | BT_DBG("%p state %d" , sk, sk->sk_state); |
186 | rfcomm_schedule(); |
187 | } |
188 | |
189 | static void rfcomm_l2data_ready(struct sock *sk) |
190 | { |
191 | trace_sk_data_ready(sk); |
192 | |
193 | BT_DBG("%p" , sk); |
194 | rfcomm_schedule(); |
195 | } |
196 | |
197 | static int rfcomm_l2sock_create(struct socket **sock) |
198 | { |
199 | int err; |
200 | |
201 | BT_DBG("" ); |
202 | |
203 | err = sock_create_kern(net: &init_net, PF_BLUETOOTH, type: SOCK_SEQPACKET, BTPROTO_L2CAP, res: sock); |
204 | if (!err) { |
205 | struct sock *sk = (*sock)->sk; |
206 | sk->sk_data_ready = rfcomm_l2data_ready; |
207 | sk->sk_state_change = rfcomm_l2state_change; |
208 | } |
209 | return err; |
210 | } |
211 | |
212 | static int rfcomm_check_security(struct rfcomm_dlc *d) |
213 | { |
214 | struct sock *sk = d->session->sock->sk; |
215 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
216 | |
217 | __u8 auth_type; |
218 | |
219 | switch (d->sec_level) { |
220 | case BT_SECURITY_HIGH: |
221 | case BT_SECURITY_FIPS: |
222 | auth_type = HCI_AT_GENERAL_BONDING_MITM; |
223 | break; |
224 | case BT_SECURITY_MEDIUM: |
225 | auth_type = HCI_AT_GENERAL_BONDING; |
226 | break; |
227 | default: |
228 | auth_type = HCI_AT_NO_BONDING; |
229 | break; |
230 | } |
231 | |
232 | return hci_conn_security(conn: conn->hcon, sec_level: d->sec_level, auth_type, |
233 | initiator: d->out); |
234 | } |
235 | |
236 | static void rfcomm_session_timeout(struct timer_list *t) |
237 | { |
238 | struct rfcomm_session *s = from_timer(s, t, timer); |
239 | |
240 | BT_DBG("session %p state %ld" , s, s->state); |
241 | |
242 | set_bit(RFCOMM_TIMED_OUT, addr: &s->flags); |
243 | rfcomm_schedule(); |
244 | } |
245 | |
246 | static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout) |
247 | { |
248 | BT_DBG("session %p state %ld timeout %ld" , s, s->state, timeout); |
249 | |
250 | mod_timer(timer: &s->timer, expires: jiffies + timeout); |
251 | } |
252 | |
253 | static void rfcomm_session_clear_timer(struct rfcomm_session *s) |
254 | { |
255 | BT_DBG("session %p state %ld" , s, s->state); |
256 | |
257 | del_timer_sync(timer: &s->timer); |
258 | } |
259 | |
260 | /* ---- RFCOMM DLCs ---- */ |
261 | static void rfcomm_dlc_timeout(struct timer_list *t) |
262 | { |
263 | struct rfcomm_dlc *d = from_timer(d, t, timer); |
264 | |
265 | BT_DBG("dlc %p state %ld" , d, d->state); |
266 | |
267 | set_bit(RFCOMM_TIMED_OUT, addr: &d->flags); |
268 | rfcomm_dlc_put(d); |
269 | rfcomm_schedule(); |
270 | } |
271 | |
272 | static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout) |
273 | { |
274 | BT_DBG("dlc %p state %ld timeout %ld" , d, d->state, timeout); |
275 | |
276 | if (!mod_timer(timer: &d->timer, expires: jiffies + timeout)) |
277 | rfcomm_dlc_hold(d); |
278 | } |
279 | |
280 | static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d) |
281 | { |
282 | BT_DBG("dlc %p state %ld" , d, d->state); |
283 | |
284 | if (del_timer(timer: &d->timer)) |
285 | rfcomm_dlc_put(d); |
286 | } |
287 | |
288 | static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d) |
289 | { |
290 | BT_DBG("%p" , d); |
291 | |
292 | d->state = BT_OPEN; |
293 | d->flags = 0; |
294 | d->mscex = 0; |
295 | d->sec_level = BT_SECURITY_LOW; |
296 | d->mtu = RFCOMM_DEFAULT_MTU; |
297 | d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV; |
298 | |
299 | d->cfc = RFCOMM_CFC_DISABLED; |
300 | d->rx_credits = RFCOMM_DEFAULT_CREDITS; |
301 | } |
302 | |
303 | struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio) |
304 | { |
305 | struct rfcomm_dlc *d = kzalloc(size: sizeof(*d), flags: prio); |
306 | |
307 | if (!d) |
308 | return NULL; |
309 | |
310 | timer_setup(&d->timer, rfcomm_dlc_timeout, 0); |
311 | |
312 | skb_queue_head_init(list: &d->tx_queue); |
313 | mutex_init(&d->lock); |
314 | refcount_set(r: &d->refcnt, n: 1); |
315 | |
316 | rfcomm_dlc_clear_state(d); |
317 | |
318 | BT_DBG("%p" , d); |
319 | |
320 | return d; |
321 | } |
322 | |
323 | void rfcomm_dlc_free(struct rfcomm_dlc *d) |
324 | { |
325 | BT_DBG("%p" , d); |
326 | |
327 | skb_queue_purge(list: &d->tx_queue); |
328 | kfree(objp: d); |
329 | } |
330 | |
331 | static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d) |
332 | { |
333 | BT_DBG("dlc %p session %p" , d, s); |
334 | |
335 | rfcomm_session_clear_timer(s); |
336 | rfcomm_dlc_hold(d); |
337 | list_add(new: &d->list, head: &s->dlcs); |
338 | d->session = s; |
339 | } |
340 | |
341 | static void rfcomm_dlc_unlink(struct rfcomm_dlc *d) |
342 | { |
343 | struct rfcomm_session *s = d->session; |
344 | |
345 | BT_DBG("dlc %p refcnt %d session %p" , d, refcount_read(&d->refcnt), s); |
346 | |
347 | list_del(entry: &d->list); |
348 | d->session = NULL; |
349 | rfcomm_dlc_put(d); |
350 | |
351 | if (list_empty(head: &s->dlcs)) |
352 | rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT); |
353 | } |
354 | |
355 | static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci) |
356 | { |
357 | struct rfcomm_dlc *d; |
358 | |
359 | list_for_each_entry(d, &s->dlcs, list) |
360 | if (d->dlci == dlci) |
361 | return d; |
362 | |
363 | return NULL; |
364 | } |
365 | |
366 | static int rfcomm_check_channel(u8 channel) |
367 | { |
368 | return channel < 1 || channel > 30; |
369 | } |
370 | |
371 | static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) |
372 | { |
373 | struct rfcomm_session *s; |
374 | int err = 0; |
375 | u8 dlci; |
376 | |
377 | BT_DBG("dlc %p state %ld %pMR -> %pMR channel %d" , |
378 | d, d->state, src, dst, channel); |
379 | |
380 | if (rfcomm_check_channel(channel)) |
381 | return -EINVAL; |
382 | |
383 | if (d->state != BT_OPEN && d->state != BT_CLOSED) |
384 | return 0; |
385 | |
386 | s = rfcomm_session_get(src, dst); |
387 | if (!s) { |
388 | s = rfcomm_session_create(src, dst, sec_level: d->sec_level, err: &err); |
389 | if (!s) |
390 | return err; |
391 | } |
392 | |
393 | dlci = __dlci(__session_dir(s), channel); |
394 | |
395 | /* Check if DLCI already exists */ |
396 | if (rfcomm_dlc_get(s, dlci)) |
397 | return -EBUSY; |
398 | |
399 | rfcomm_dlc_clear_state(d); |
400 | |
401 | d->dlci = dlci; |
402 | d->addr = __addr(s->initiator, dlci); |
403 | d->priority = 7; |
404 | |
405 | d->state = BT_CONFIG; |
406 | rfcomm_dlc_link(s, d); |
407 | |
408 | d->out = 1; |
409 | |
410 | d->mtu = s->mtu; |
411 | d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc; |
412 | |
413 | if (s->state == BT_CONNECTED) { |
414 | if (rfcomm_check_security(d)) |
415 | rfcomm_send_pn(s, cr: 1, d); |
416 | else |
417 | set_bit(RFCOMM_AUTH_PENDING, addr: &d->flags); |
418 | } |
419 | |
420 | rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); |
421 | |
422 | return 0; |
423 | } |
424 | |
425 | int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) |
426 | { |
427 | int r; |
428 | |
429 | rfcomm_lock(); |
430 | |
431 | r = __rfcomm_dlc_open(d, src, dst, channel); |
432 | |
433 | rfcomm_unlock(); |
434 | return r; |
435 | } |
436 | |
437 | static void __rfcomm_dlc_disconn(struct rfcomm_dlc *d) |
438 | { |
439 | struct rfcomm_session *s = d->session; |
440 | |
441 | d->state = BT_DISCONN; |
442 | if (skb_queue_empty(list: &d->tx_queue)) { |
443 | rfcomm_send_disc(s, dlci: d->dlci); |
444 | rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT); |
445 | } else { |
446 | rfcomm_queue_disc(d); |
447 | rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2); |
448 | } |
449 | } |
450 | |
451 | static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err) |
452 | { |
453 | struct rfcomm_session *s = d->session; |
454 | if (!s) |
455 | return 0; |
456 | |
457 | BT_DBG("dlc %p state %ld dlci %d err %d session %p" , |
458 | d, d->state, d->dlci, err, s); |
459 | |
460 | switch (d->state) { |
461 | case BT_CONNECT: |
462 | case BT_CONFIG: |
463 | case BT_OPEN: |
464 | case BT_CONNECT2: |
465 | if (test_and_clear_bit(RFCOMM_DEFER_SETUP, addr: &d->flags)) { |
466 | set_bit(RFCOMM_AUTH_REJECT, addr: &d->flags); |
467 | rfcomm_schedule(); |
468 | return 0; |
469 | } |
470 | } |
471 | |
472 | switch (d->state) { |
473 | case BT_CONNECT: |
474 | case BT_CONNECTED: |
475 | __rfcomm_dlc_disconn(d); |
476 | break; |
477 | |
478 | case BT_CONFIG: |
479 | if (s->state != BT_BOUND) { |
480 | __rfcomm_dlc_disconn(d); |
481 | break; |
482 | } |
483 | /* if closing a dlc in a session that hasn't been started, |
484 | * just close and unlink the dlc |
485 | */ |
486 | fallthrough; |
487 | |
488 | default: |
489 | rfcomm_dlc_clear_timer(d); |
490 | |
491 | rfcomm_dlc_lock(d); |
492 | d->state = BT_CLOSED; |
493 | d->state_change(d, err); |
494 | rfcomm_dlc_unlock(d); |
495 | |
496 | skb_queue_purge(list: &d->tx_queue); |
497 | rfcomm_dlc_unlink(d); |
498 | } |
499 | |
500 | return 0; |
501 | } |
502 | |
503 | int rfcomm_dlc_close(struct rfcomm_dlc *d, int err) |
504 | { |
505 | int r = 0; |
506 | struct rfcomm_dlc *d_list; |
507 | struct rfcomm_session *s, *s_list; |
508 | |
509 | BT_DBG("dlc %p state %ld dlci %d err %d" , d, d->state, d->dlci, err); |
510 | |
511 | rfcomm_lock(); |
512 | |
513 | s = d->session; |
514 | if (!s) |
515 | goto no_session; |
516 | |
517 | /* after waiting on the mutex check the session still exists |
518 | * then check the dlc still exists |
519 | */ |
520 | list_for_each_entry(s_list, &session_list, list) { |
521 | if (s_list == s) { |
522 | list_for_each_entry(d_list, &s->dlcs, list) { |
523 | if (d_list == d) { |
524 | r = __rfcomm_dlc_close(d, err); |
525 | break; |
526 | } |
527 | } |
528 | break; |
529 | } |
530 | } |
531 | |
532 | no_session: |
533 | rfcomm_unlock(); |
534 | return r; |
535 | } |
536 | |
537 | struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel) |
538 | { |
539 | struct rfcomm_session *s; |
540 | struct rfcomm_dlc *dlc = NULL; |
541 | u8 dlci; |
542 | |
543 | if (rfcomm_check_channel(channel)) |
544 | return ERR_PTR(error: -EINVAL); |
545 | |
546 | rfcomm_lock(); |
547 | s = rfcomm_session_get(src, dst); |
548 | if (s) { |
549 | dlci = __dlci(__session_dir(s), channel); |
550 | dlc = rfcomm_dlc_get(s, dlci); |
551 | } |
552 | rfcomm_unlock(); |
553 | return dlc; |
554 | } |
555 | |
556 | static int rfcomm_dlc_send_frag(struct rfcomm_dlc *d, struct sk_buff *frag) |
557 | { |
558 | int len = frag->len; |
559 | |
560 | BT_DBG("dlc %p mtu %d len %d" , d, d->mtu, len); |
561 | |
562 | if (len > d->mtu) |
563 | return -EINVAL; |
564 | |
565 | rfcomm_make_uih(skb: frag, addr: d->addr); |
566 | __skb_queue_tail(list: &d->tx_queue, newsk: frag); |
567 | |
568 | return len; |
569 | } |
570 | |
571 | int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb) |
572 | { |
573 | unsigned long flags; |
574 | struct sk_buff *frag, *next; |
575 | int len; |
576 | |
577 | if (d->state != BT_CONNECTED) |
578 | return -ENOTCONN; |
579 | |
580 | frag = skb_shinfo(skb)->frag_list; |
581 | skb_shinfo(skb)->frag_list = NULL; |
582 | |
583 | /* Queue all fragments atomically. */ |
584 | spin_lock_irqsave(&d->tx_queue.lock, flags); |
585 | |
586 | len = rfcomm_dlc_send_frag(d, frag: skb); |
587 | if (len < 0 || !frag) |
588 | goto unlock; |
589 | |
590 | for (; frag; frag = next) { |
591 | int ret; |
592 | |
593 | next = frag->next; |
594 | |
595 | ret = rfcomm_dlc_send_frag(d, frag); |
596 | if (ret < 0) { |
597 | dev_kfree_skb_irq(skb: frag); |
598 | goto unlock; |
599 | } |
600 | |
601 | len += ret; |
602 | } |
603 | |
604 | unlock: |
605 | spin_unlock_irqrestore(lock: &d->tx_queue.lock, flags); |
606 | |
607 | if (len > 0 && !test_bit(RFCOMM_TX_THROTTLED, &d->flags)) |
608 | rfcomm_schedule(); |
609 | return len; |
610 | } |
611 | |
612 | void rfcomm_dlc_send_noerror(struct rfcomm_dlc *d, struct sk_buff *skb) |
613 | { |
614 | int len = skb->len; |
615 | |
616 | BT_DBG("dlc %p mtu %d len %d" , d, d->mtu, len); |
617 | |
618 | rfcomm_make_uih(skb, addr: d->addr); |
619 | skb_queue_tail(list: &d->tx_queue, newsk: skb); |
620 | |
621 | if (d->state == BT_CONNECTED && |
622 | !test_bit(RFCOMM_TX_THROTTLED, &d->flags)) |
623 | rfcomm_schedule(); |
624 | } |
625 | |
626 | void __rfcomm_dlc_throttle(struct rfcomm_dlc *d) |
627 | { |
628 | BT_DBG("dlc %p state %ld" , d, d->state); |
629 | |
630 | if (!d->cfc) { |
631 | d->v24_sig |= RFCOMM_V24_FC; |
632 | set_bit(RFCOMM_MSC_PENDING, addr: &d->flags); |
633 | } |
634 | rfcomm_schedule(); |
635 | } |
636 | |
637 | void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d) |
638 | { |
639 | BT_DBG("dlc %p state %ld" , d, d->state); |
640 | |
641 | if (!d->cfc) { |
642 | d->v24_sig &= ~RFCOMM_V24_FC; |
643 | set_bit(RFCOMM_MSC_PENDING, addr: &d->flags); |
644 | } |
645 | rfcomm_schedule(); |
646 | } |
647 | |
648 | /* |
649 | Set/get modem status functions use _local_ status i.e. what we report |
650 | to the other side. |
651 | Remote status is provided by dlc->modem_status() callback. |
652 | */ |
653 | int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig) |
654 | { |
655 | BT_DBG("dlc %p state %ld v24_sig 0x%x" , |
656 | d, d->state, v24_sig); |
657 | |
658 | if (test_bit(RFCOMM_RX_THROTTLED, &d->flags)) |
659 | v24_sig |= RFCOMM_V24_FC; |
660 | else |
661 | v24_sig &= ~RFCOMM_V24_FC; |
662 | |
663 | d->v24_sig = v24_sig; |
664 | |
665 | if (!test_and_set_bit(RFCOMM_MSC_PENDING, addr: &d->flags)) |
666 | rfcomm_schedule(); |
667 | |
668 | return 0; |
669 | } |
670 | |
671 | int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig) |
672 | { |
673 | BT_DBG("dlc %p state %ld v24_sig 0x%x" , |
674 | d, d->state, d->v24_sig); |
675 | |
676 | *v24_sig = d->v24_sig; |
677 | return 0; |
678 | } |
679 | |
680 | /* ---- RFCOMM sessions ---- */ |
681 | static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state) |
682 | { |
683 | struct rfcomm_session *s = kzalloc(size: sizeof(*s), GFP_KERNEL); |
684 | |
685 | if (!s) |
686 | return NULL; |
687 | |
688 | BT_DBG("session %p sock %p" , s, sock); |
689 | |
690 | timer_setup(&s->timer, rfcomm_session_timeout, 0); |
691 | |
692 | INIT_LIST_HEAD(list: &s->dlcs); |
693 | s->state = state; |
694 | s->sock = sock; |
695 | |
696 | s->mtu = RFCOMM_DEFAULT_MTU; |
697 | s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN; |
698 | |
699 | /* Do not increment module usage count for listening sessions. |
700 | * Otherwise we won't be able to unload the module. */ |
701 | if (state != BT_LISTEN) |
702 | if (!try_module_get(THIS_MODULE)) { |
703 | kfree(objp: s); |
704 | return NULL; |
705 | } |
706 | |
707 | list_add(new: &s->list, head: &session_list); |
708 | |
709 | return s; |
710 | } |
711 | |
712 | static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s) |
713 | { |
714 | int state = s->state; |
715 | |
716 | BT_DBG("session %p state %ld" , s, s->state); |
717 | |
718 | list_del(entry: &s->list); |
719 | |
720 | rfcomm_session_clear_timer(s); |
721 | sock_release(sock: s->sock); |
722 | kfree(objp: s); |
723 | |
724 | if (state != BT_LISTEN) |
725 | module_put(THIS_MODULE); |
726 | |
727 | return NULL; |
728 | } |
729 | |
730 | static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst) |
731 | { |
732 | struct rfcomm_session *s, *n; |
733 | struct l2cap_chan *chan; |
734 | list_for_each_entry_safe(s, n, &session_list, list) { |
735 | chan = l2cap_pi(s->sock->sk)->chan; |
736 | |
737 | if ((!bacmp(ba1: src, BDADDR_ANY) || !bacmp(ba1: &chan->src, ba2: src)) && |
738 | !bacmp(ba1: &chan->dst, ba2: dst)) |
739 | return s; |
740 | } |
741 | return NULL; |
742 | } |
743 | |
744 | static struct rfcomm_session *rfcomm_session_close(struct rfcomm_session *s, |
745 | int err) |
746 | { |
747 | struct rfcomm_dlc *d, *n; |
748 | |
749 | s->state = BT_CLOSED; |
750 | |
751 | BT_DBG("session %p state %ld err %d" , s, s->state, err); |
752 | |
753 | /* Close all dlcs */ |
754 | list_for_each_entry_safe(d, n, &s->dlcs, list) { |
755 | d->state = BT_CLOSED; |
756 | __rfcomm_dlc_close(d, err); |
757 | } |
758 | |
759 | rfcomm_session_clear_timer(s); |
760 | return rfcomm_session_del(s); |
761 | } |
762 | |
763 | static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, |
764 | bdaddr_t *dst, |
765 | u8 sec_level, |
766 | int *err) |
767 | { |
768 | struct rfcomm_session *s = NULL; |
769 | struct sockaddr_l2 addr; |
770 | struct socket *sock; |
771 | struct sock *sk; |
772 | |
773 | BT_DBG("%pMR -> %pMR" , src, dst); |
774 | |
775 | *err = rfcomm_l2sock_create(sock: &sock); |
776 | if (*err < 0) |
777 | return NULL; |
778 | |
779 | bacpy(dst: &addr.l2_bdaddr, src); |
780 | addr.l2_family = AF_BLUETOOTH; |
781 | addr.l2_psm = 0; |
782 | addr.l2_cid = 0; |
783 | addr.l2_bdaddr_type = BDADDR_BREDR; |
784 | *err = kernel_bind(sock, addr: (struct sockaddr *) &addr, addrlen: sizeof(addr)); |
785 | if (*err < 0) |
786 | goto failed; |
787 | |
788 | /* Set L2CAP options */ |
789 | sk = sock->sk; |
790 | lock_sock(sk); |
791 | /* Set MTU to 0 so L2CAP can auto select the MTU */ |
792 | l2cap_pi(sk)->chan->imtu = 0; |
793 | l2cap_pi(sk)->chan->sec_level = sec_level; |
794 | if (l2cap_ertm) |
795 | l2cap_pi(sk)->chan->mode = L2CAP_MODE_ERTM; |
796 | release_sock(sk); |
797 | |
798 | s = rfcomm_session_add(sock, state: BT_BOUND); |
799 | if (!s) { |
800 | *err = -ENOMEM; |
801 | goto failed; |
802 | } |
803 | |
804 | s->initiator = 1; |
805 | |
806 | bacpy(dst: &addr.l2_bdaddr, src: dst); |
807 | addr.l2_family = AF_BLUETOOTH; |
808 | addr.l2_psm = cpu_to_le16(L2CAP_PSM_RFCOMM); |
809 | addr.l2_cid = 0; |
810 | addr.l2_bdaddr_type = BDADDR_BREDR; |
811 | *err = kernel_connect(sock, addr: (struct sockaddr *) &addr, addrlen: sizeof(addr), O_NONBLOCK); |
812 | if (*err == 0 || *err == -EINPROGRESS) |
813 | return s; |
814 | |
815 | return rfcomm_session_del(s); |
816 | |
817 | failed: |
818 | sock_release(sock); |
819 | return NULL; |
820 | } |
821 | |
822 | void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst) |
823 | { |
824 | struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan; |
825 | if (src) |
826 | bacpy(dst: src, src: &chan->src); |
827 | if (dst) |
828 | bacpy(dst, src: &chan->dst); |
829 | } |
830 | |
831 | /* ---- RFCOMM frame sending ---- */ |
832 | static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len) |
833 | { |
834 | struct kvec iv = { data, len }; |
835 | struct msghdr msg; |
836 | |
837 | BT_DBG("session %p len %d" , s, len); |
838 | |
839 | memset(&msg, 0, sizeof(msg)); |
840 | |
841 | return kernel_sendmsg(sock: s->sock, msg: &msg, vec: &iv, num: 1, len); |
842 | } |
843 | |
844 | static int rfcomm_send_cmd(struct rfcomm_session *s, struct rfcomm_cmd *cmd) |
845 | { |
846 | BT_DBG("%p cmd %u" , s, cmd->ctrl); |
847 | |
848 | return rfcomm_send_frame(s, data: (void *) cmd, len: sizeof(*cmd)); |
849 | } |
850 | |
851 | static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci) |
852 | { |
853 | struct rfcomm_cmd cmd; |
854 | |
855 | BT_DBG("%p dlci %d" , s, dlci); |
856 | |
857 | cmd.addr = __addr(s->initiator, dlci); |
858 | cmd.ctrl = __ctrl(RFCOMM_SABM, 1); |
859 | cmd.len = __len8(0); |
860 | cmd.fcs = __fcs2(data: (u8 *) &cmd); |
861 | |
862 | return rfcomm_send_cmd(s, cmd: &cmd); |
863 | } |
864 | |
865 | static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci) |
866 | { |
867 | struct rfcomm_cmd cmd; |
868 | |
869 | BT_DBG("%p dlci %d" , s, dlci); |
870 | |
871 | cmd.addr = __addr(!s->initiator, dlci); |
872 | cmd.ctrl = __ctrl(RFCOMM_UA, 1); |
873 | cmd.len = __len8(0); |
874 | cmd.fcs = __fcs2(data: (u8 *) &cmd); |
875 | |
876 | return rfcomm_send_cmd(s, cmd: &cmd); |
877 | } |
878 | |
879 | static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci) |
880 | { |
881 | struct rfcomm_cmd cmd; |
882 | |
883 | BT_DBG("%p dlci %d" , s, dlci); |
884 | |
885 | cmd.addr = __addr(s->initiator, dlci); |
886 | cmd.ctrl = __ctrl(RFCOMM_DISC, 1); |
887 | cmd.len = __len8(0); |
888 | cmd.fcs = __fcs2(data: (u8 *) &cmd); |
889 | |
890 | return rfcomm_send_cmd(s, cmd: &cmd); |
891 | } |
892 | |
893 | static int rfcomm_queue_disc(struct rfcomm_dlc *d) |
894 | { |
895 | struct rfcomm_cmd *cmd; |
896 | struct sk_buff *skb; |
897 | |
898 | BT_DBG("dlc %p dlci %d" , d, d->dlci); |
899 | |
900 | skb = alloc_skb(size: sizeof(*cmd), GFP_KERNEL); |
901 | if (!skb) |
902 | return -ENOMEM; |
903 | |
904 | cmd = __skb_put(skb, len: sizeof(*cmd)); |
905 | cmd->addr = d->addr; |
906 | cmd->ctrl = __ctrl(RFCOMM_DISC, 1); |
907 | cmd->len = __len8(0); |
908 | cmd->fcs = __fcs2(data: (u8 *) cmd); |
909 | |
910 | skb_queue_tail(list: &d->tx_queue, newsk: skb); |
911 | rfcomm_schedule(); |
912 | return 0; |
913 | } |
914 | |
915 | static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci) |
916 | { |
917 | struct rfcomm_cmd cmd; |
918 | |
919 | BT_DBG("%p dlci %d" , s, dlci); |
920 | |
921 | cmd.addr = __addr(!s->initiator, dlci); |
922 | cmd.ctrl = __ctrl(RFCOMM_DM, 1); |
923 | cmd.len = __len8(0); |
924 | cmd.fcs = __fcs2(data: (u8 *) &cmd); |
925 | |
926 | return rfcomm_send_cmd(s, cmd: &cmd); |
927 | } |
928 | |
929 | static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type) |
930 | { |
931 | struct rfcomm_hdr *hdr; |
932 | struct rfcomm_mcc *mcc; |
933 | u8 buf[16], *ptr = buf; |
934 | |
935 | BT_DBG("%p cr %d type %d" , s, cr, type); |
936 | |
937 | hdr = (void *) ptr; ptr += sizeof(*hdr); |
938 | hdr->addr = __addr(s->initiator, 0); |
939 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); |
940 | hdr->len = __len8(sizeof(*mcc) + 1); |
941 | |
942 | mcc = (void *) ptr; ptr += sizeof(*mcc); |
943 | mcc->type = __mcc_type(0, RFCOMM_NSC); |
944 | mcc->len = __len8(1); |
945 | |
946 | /* Type that we didn't like */ |
947 | *ptr = __mcc_type(cr, type); ptr++; |
948 | |
949 | *ptr = __fcs(data: buf); ptr++; |
950 | |
951 | return rfcomm_send_frame(s, data: buf, len: ptr - buf); |
952 | } |
953 | |
954 | static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d) |
955 | { |
956 | struct rfcomm_hdr *hdr; |
957 | struct rfcomm_mcc *mcc; |
958 | struct rfcomm_pn *pn; |
959 | u8 buf[16], *ptr = buf; |
960 | |
961 | BT_DBG("%p cr %d dlci %d mtu %d" , s, cr, d->dlci, d->mtu); |
962 | |
963 | hdr = (void *) ptr; ptr += sizeof(*hdr); |
964 | hdr->addr = __addr(s->initiator, 0); |
965 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); |
966 | hdr->len = __len8(sizeof(*mcc) + sizeof(*pn)); |
967 | |
968 | mcc = (void *) ptr; ptr += sizeof(*mcc); |
969 | mcc->type = __mcc_type(cr, RFCOMM_PN); |
970 | mcc->len = __len8(sizeof(*pn)); |
971 | |
972 | pn = (void *) ptr; ptr += sizeof(*pn); |
973 | pn->dlci = d->dlci; |
974 | pn->priority = d->priority; |
975 | pn->ack_timer = 0; |
976 | pn->max_retrans = 0; |
977 | |
978 | if (s->cfc) { |
979 | pn->flow_ctrl = cr ? 0xf0 : 0xe0; |
980 | pn->credits = RFCOMM_DEFAULT_CREDITS; |
981 | } else { |
982 | pn->flow_ctrl = 0; |
983 | pn->credits = 0; |
984 | } |
985 | |
986 | if (cr && channel_mtu >= 0) |
987 | pn->mtu = cpu_to_le16(channel_mtu); |
988 | else |
989 | pn->mtu = cpu_to_le16(d->mtu); |
990 | |
991 | *ptr = __fcs(data: buf); ptr++; |
992 | |
993 | return rfcomm_send_frame(s, data: buf, len: ptr - buf); |
994 | } |
995 | |
996 | int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci, |
997 | u8 bit_rate, u8 data_bits, u8 stop_bits, |
998 | u8 parity, u8 flow_ctrl_settings, |
999 | u8 xon_char, u8 xoff_char, u16 param_mask) |
1000 | { |
1001 | struct rfcomm_hdr *hdr; |
1002 | struct rfcomm_mcc *mcc; |
1003 | struct rfcomm_rpn *rpn; |
1004 | u8 buf[16], *ptr = buf; |
1005 | |
1006 | BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x" |
1007 | " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x" , |
1008 | s, cr, dlci, bit_rate, data_bits, stop_bits, parity, |
1009 | flow_ctrl_settings, xon_char, xoff_char, param_mask); |
1010 | |
1011 | hdr = (void *) ptr; ptr += sizeof(*hdr); |
1012 | hdr->addr = __addr(s->initiator, 0); |
1013 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); |
1014 | hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn)); |
1015 | |
1016 | mcc = (void *) ptr; ptr += sizeof(*mcc); |
1017 | mcc->type = __mcc_type(cr, RFCOMM_RPN); |
1018 | mcc->len = __len8(sizeof(*rpn)); |
1019 | |
1020 | rpn = (void *) ptr; ptr += sizeof(*rpn); |
1021 | rpn->dlci = __addr(1, dlci); |
1022 | rpn->bit_rate = bit_rate; |
1023 | rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity); |
1024 | rpn->flow_ctrl = flow_ctrl_settings; |
1025 | rpn->xon_char = xon_char; |
1026 | rpn->xoff_char = xoff_char; |
1027 | rpn->param_mask = cpu_to_le16(param_mask); |
1028 | |
1029 | *ptr = __fcs(data: buf); ptr++; |
1030 | |
1031 | return rfcomm_send_frame(s, data: buf, len: ptr - buf); |
1032 | } |
1033 | |
1034 | static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status) |
1035 | { |
1036 | struct rfcomm_hdr *hdr; |
1037 | struct rfcomm_mcc *mcc; |
1038 | struct rfcomm_rls *rls; |
1039 | u8 buf[16], *ptr = buf; |
1040 | |
1041 | BT_DBG("%p cr %d status 0x%x" , s, cr, status); |
1042 | |
1043 | hdr = (void *) ptr; ptr += sizeof(*hdr); |
1044 | hdr->addr = __addr(s->initiator, 0); |
1045 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); |
1046 | hdr->len = __len8(sizeof(*mcc) + sizeof(*rls)); |
1047 | |
1048 | mcc = (void *) ptr; ptr += sizeof(*mcc); |
1049 | mcc->type = __mcc_type(cr, RFCOMM_RLS); |
1050 | mcc->len = __len8(sizeof(*rls)); |
1051 | |
1052 | rls = (void *) ptr; ptr += sizeof(*rls); |
1053 | rls->dlci = __addr(1, dlci); |
1054 | rls->status = status; |
1055 | |
1056 | *ptr = __fcs(data: buf); ptr++; |
1057 | |
1058 | return rfcomm_send_frame(s, data: buf, len: ptr - buf); |
1059 | } |
1060 | |
1061 | static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig) |
1062 | { |
1063 | struct rfcomm_hdr *hdr; |
1064 | struct rfcomm_mcc *mcc; |
1065 | struct rfcomm_msc *msc; |
1066 | u8 buf[16], *ptr = buf; |
1067 | |
1068 | BT_DBG("%p cr %d v24 0x%x" , s, cr, v24_sig); |
1069 | |
1070 | hdr = (void *) ptr; ptr += sizeof(*hdr); |
1071 | hdr->addr = __addr(s->initiator, 0); |
1072 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); |
1073 | hdr->len = __len8(sizeof(*mcc) + sizeof(*msc)); |
1074 | |
1075 | mcc = (void *) ptr; ptr += sizeof(*mcc); |
1076 | mcc->type = __mcc_type(cr, RFCOMM_MSC); |
1077 | mcc->len = __len8(sizeof(*msc)); |
1078 | |
1079 | msc = (void *) ptr; ptr += sizeof(*msc); |
1080 | msc->dlci = __addr(1, dlci); |
1081 | msc->v24_sig = v24_sig | 0x01; |
1082 | |
1083 | *ptr = __fcs(data: buf); ptr++; |
1084 | |
1085 | return rfcomm_send_frame(s, data: buf, len: ptr - buf); |
1086 | } |
1087 | |
1088 | static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr) |
1089 | { |
1090 | struct rfcomm_hdr *hdr; |
1091 | struct rfcomm_mcc *mcc; |
1092 | u8 buf[16], *ptr = buf; |
1093 | |
1094 | BT_DBG("%p cr %d" , s, cr); |
1095 | |
1096 | hdr = (void *) ptr; ptr += sizeof(*hdr); |
1097 | hdr->addr = __addr(s->initiator, 0); |
1098 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); |
1099 | hdr->len = __len8(sizeof(*mcc)); |
1100 | |
1101 | mcc = (void *) ptr; ptr += sizeof(*mcc); |
1102 | mcc->type = __mcc_type(cr, RFCOMM_FCOFF); |
1103 | mcc->len = __len8(0); |
1104 | |
1105 | *ptr = __fcs(data: buf); ptr++; |
1106 | |
1107 | return rfcomm_send_frame(s, data: buf, len: ptr - buf); |
1108 | } |
1109 | |
1110 | static int rfcomm_send_fcon(struct rfcomm_session *s, int cr) |
1111 | { |
1112 | struct rfcomm_hdr *hdr; |
1113 | struct rfcomm_mcc *mcc; |
1114 | u8 buf[16], *ptr = buf; |
1115 | |
1116 | BT_DBG("%p cr %d" , s, cr); |
1117 | |
1118 | hdr = (void *) ptr; ptr += sizeof(*hdr); |
1119 | hdr->addr = __addr(s->initiator, 0); |
1120 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); |
1121 | hdr->len = __len8(sizeof(*mcc)); |
1122 | |
1123 | mcc = (void *) ptr; ptr += sizeof(*mcc); |
1124 | mcc->type = __mcc_type(cr, RFCOMM_FCON); |
1125 | mcc->len = __len8(0); |
1126 | |
1127 | *ptr = __fcs(data: buf); ptr++; |
1128 | |
1129 | return rfcomm_send_frame(s, data: buf, len: ptr - buf); |
1130 | } |
1131 | |
1132 | static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len) |
1133 | { |
1134 | struct socket *sock = s->sock; |
1135 | struct kvec iv[3]; |
1136 | struct msghdr msg; |
1137 | unsigned char hdr[5], crc[1]; |
1138 | |
1139 | if (len > 125) |
1140 | return -EINVAL; |
1141 | |
1142 | BT_DBG("%p cr %d" , s, cr); |
1143 | |
1144 | hdr[0] = __addr(s->initiator, 0); |
1145 | hdr[1] = __ctrl(RFCOMM_UIH, 0); |
1146 | hdr[2] = 0x01 | ((len + 2) << 1); |
1147 | hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2); |
1148 | hdr[4] = 0x01 | (len << 1); |
1149 | |
1150 | crc[0] = __fcs(data: hdr); |
1151 | |
1152 | iv[0].iov_base = hdr; |
1153 | iv[0].iov_len = 5; |
1154 | iv[1].iov_base = pattern; |
1155 | iv[1].iov_len = len; |
1156 | iv[2].iov_base = crc; |
1157 | iv[2].iov_len = 1; |
1158 | |
1159 | memset(&msg, 0, sizeof(msg)); |
1160 | |
1161 | return kernel_sendmsg(sock, msg: &msg, vec: iv, num: 3, len: 6 + len); |
1162 | } |
1163 | |
1164 | static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits) |
1165 | { |
1166 | struct rfcomm_hdr *hdr; |
1167 | u8 buf[16], *ptr = buf; |
1168 | |
1169 | BT_DBG("%p addr %d credits %d" , s, addr, credits); |
1170 | |
1171 | hdr = (void *) ptr; ptr += sizeof(*hdr); |
1172 | hdr->addr = addr; |
1173 | hdr->ctrl = __ctrl(RFCOMM_UIH, 1); |
1174 | hdr->len = __len8(0); |
1175 | |
1176 | *ptr = credits; ptr++; |
1177 | |
1178 | *ptr = __fcs(data: buf); ptr++; |
1179 | |
1180 | return rfcomm_send_frame(s, data: buf, len: ptr - buf); |
1181 | } |
1182 | |
1183 | static void rfcomm_make_uih(struct sk_buff *skb, u8 addr) |
1184 | { |
1185 | struct rfcomm_hdr *hdr; |
1186 | int len = skb->len; |
1187 | u8 *crc; |
1188 | |
1189 | if (len > 127) { |
1190 | hdr = skb_push(skb, len: 4); |
1191 | put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len); |
1192 | } else { |
1193 | hdr = skb_push(skb, len: 3); |
1194 | hdr->len = __len8(len); |
1195 | } |
1196 | hdr->addr = addr; |
1197 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); |
1198 | |
1199 | crc = skb_put(skb, len: 1); |
1200 | *crc = __fcs(data: (void *) hdr); |
1201 | } |
1202 | |
1203 | /* ---- RFCOMM frame reception ---- */ |
1204 | static struct rfcomm_session *rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci) |
1205 | { |
1206 | BT_DBG("session %p state %ld dlci %d" , s, s->state, dlci); |
1207 | |
1208 | if (dlci) { |
1209 | /* Data channel */ |
1210 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); |
1211 | if (!d) { |
1212 | rfcomm_send_dm(s, dlci); |
1213 | return s; |
1214 | } |
1215 | |
1216 | switch (d->state) { |
1217 | case BT_CONNECT: |
1218 | rfcomm_dlc_clear_timer(d); |
1219 | |
1220 | rfcomm_dlc_lock(d); |
1221 | d->state = BT_CONNECTED; |
1222 | d->state_change(d, 0); |
1223 | rfcomm_dlc_unlock(d); |
1224 | |
1225 | rfcomm_send_msc(s, cr: 1, dlci, v24_sig: d->v24_sig); |
1226 | break; |
1227 | |
1228 | case BT_DISCONN: |
1229 | d->state = BT_CLOSED; |
1230 | __rfcomm_dlc_close(d, err: 0); |
1231 | |
1232 | if (list_empty(head: &s->dlcs)) { |
1233 | s->state = BT_DISCONN; |
1234 | rfcomm_send_disc(s, dlci: 0); |
1235 | rfcomm_session_clear_timer(s); |
1236 | } |
1237 | |
1238 | break; |
1239 | } |
1240 | } else { |
1241 | /* Control channel */ |
1242 | switch (s->state) { |
1243 | case BT_CONNECT: |
1244 | s->state = BT_CONNECTED; |
1245 | rfcomm_process_connect(s); |
1246 | break; |
1247 | |
1248 | case BT_DISCONN: |
1249 | s = rfcomm_session_close(s, ECONNRESET); |
1250 | break; |
1251 | } |
1252 | } |
1253 | return s; |
1254 | } |
1255 | |
1256 | static struct rfcomm_session *rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci) |
1257 | { |
1258 | int err = 0; |
1259 | |
1260 | BT_DBG("session %p state %ld dlci %d" , s, s->state, dlci); |
1261 | |
1262 | if (dlci) { |
1263 | /* Data DLC */ |
1264 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); |
1265 | if (d) { |
1266 | if (d->state == BT_CONNECT || d->state == BT_CONFIG) |
1267 | err = ECONNREFUSED; |
1268 | else |
1269 | err = ECONNRESET; |
1270 | |
1271 | d->state = BT_CLOSED; |
1272 | __rfcomm_dlc_close(d, err); |
1273 | } |
1274 | } else { |
1275 | if (s->state == BT_CONNECT) |
1276 | err = ECONNREFUSED; |
1277 | else |
1278 | err = ECONNRESET; |
1279 | |
1280 | s = rfcomm_session_close(s, err); |
1281 | } |
1282 | return s; |
1283 | } |
1284 | |
1285 | static struct rfcomm_session *rfcomm_recv_disc(struct rfcomm_session *s, |
1286 | u8 dlci) |
1287 | { |
1288 | int err = 0; |
1289 | |
1290 | BT_DBG("session %p state %ld dlci %d" , s, s->state, dlci); |
1291 | |
1292 | if (dlci) { |
1293 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); |
1294 | if (d) { |
1295 | rfcomm_send_ua(s, dlci); |
1296 | |
1297 | if (d->state == BT_CONNECT || d->state == BT_CONFIG) |
1298 | err = ECONNREFUSED; |
1299 | else |
1300 | err = ECONNRESET; |
1301 | |
1302 | d->state = BT_CLOSED; |
1303 | __rfcomm_dlc_close(d, err); |
1304 | } else |
1305 | rfcomm_send_dm(s, dlci); |
1306 | |
1307 | } else { |
1308 | rfcomm_send_ua(s, dlci: 0); |
1309 | |
1310 | if (s->state == BT_CONNECT) |
1311 | err = ECONNREFUSED; |
1312 | else |
1313 | err = ECONNRESET; |
1314 | |
1315 | s = rfcomm_session_close(s, err); |
1316 | } |
1317 | return s; |
1318 | } |
1319 | |
1320 | void rfcomm_dlc_accept(struct rfcomm_dlc *d) |
1321 | { |
1322 | struct sock *sk = d->session->sock->sk; |
1323 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1324 | |
1325 | BT_DBG("dlc %p" , d); |
1326 | |
1327 | rfcomm_send_ua(s: d->session, dlci: d->dlci); |
1328 | |
1329 | rfcomm_dlc_clear_timer(d); |
1330 | |
1331 | rfcomm_dlc_lock(d); |
1332 | d->state = BT_CONNECTED; |
1333 | d->state_change(d, 0); |
1334 | rfcomm_dlc_unlock(d); |
1335 | |
1336 | if (d->role_switch) |
1337 | hci_conn_switch_role(conn: conn->hcon, role: 0x00); |
1338 | |
1339 | rfcomm_send_msc(s: d->session, cr: 1, dlci: d->dlci, v24_sig: d->v24_sig); |
1340 | } |
1341 | |
1342 | static void rfcomm_check_accept(struct rfcomm_dlc *d) |
1343 | { |
1344 | if (rfcomm_check_security(d)) { |
1345 | if (d->defer_setup) { |
1346 | set_bit(RFCOMM_DEFER_SETUP, addr: &d->flags); |
1347 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); |
1348 | |
1349 | rfcomm_dlc_lock(d); |
1350 | d->state = BT_CONNECT2; |
1351 | d->state_change(d, 0); |
1352 | rfcomm_dlc_unlock(d); |
1353 | } else |
1354 | rfcomm_dlc_accept(d); |
1355 | } else { |
1356 | set_bit(RFCOMM_AUTH_PENDING, addr: &d->flags); |
1357 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); |
1358 | } |
1359 | } |
1360 | |
1361 | static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci) |
1362 | { |
1363 | struct rfcomm_dlc *d; |
1364 | u8 channel; |
1365 | |
1366 | BT_DBG("session %p state %ld dlci %d" , s, s->state, dlci); |
1367 | |
1368 | if (!dlci) { |
1369 | rfcomm_send_ua(s, dlci: 0); |
1370 | |
1371 | if (s->state == BT_OPEN) { |
1372 | s->state = BT_CONNECTED; |
1373 | rfcomm_process_connect(s); |
1374 | } |
1375 | return 0; |
1376 | } |
1377 | |
1378 | /* Check if DLC exists */ |
1379 | d = rfcomm_dlc_get(s, dlci); |
1380 | if (d) { |
1381 | if (d->state == BT_OPEN) { |
1382 | /* DLC was previously opened by PN request */ |
1383 | rfcomm_check_accept(d); |
1384 | } |
1385 | return 0; |
1386 | } |
1387 | |
1388 | /* Notify socket layer about incoming connection */ |
1389 | channel = __srv_channel(dlci); |
1390 | if (rfcomm_connect_ind(s, channel, d: &d)) { |
1391 | d->dlci = dlci; |
1392 | d->addr = __addr(s->initiator, dlci); |
1393 | rfcomm_dlc_link(s, d); |
1394 | |
1395 | rfcomm_check_accept(d); |
1396 | } else { |
1397 | rfcomm_send_dm(s, dlci); |
1398 | } |
1399 | |
1400 | return 0; |
1401 | } |
1402 | |
1403 | static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn) |
1404 | { |
1405 | struct rfcomm_session *s = d->session; |
1406 | |
1407 | BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d" , |
1408 | d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits); |
1409 | |
1410 | if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) || |
1411 | pn->flow_ctrl == 0xe0) { |
1412 | d->cfc = RFCOMM_CFC_ENABLED; |
1413 | d->tx_credits = pn->credits; |
1414 | } else { |
1415 | d->cfc = RFCOMM_CFC_DISABLED; |
1416 | set_bit(RFCOMM_TX_THROTTLED, addr: &d->flags); |
1417 | } |
1418 | |
1419 | if (s->cfc == RFCOMM_CFC_UNKNOWN) |
1420 | s->cfc = d->cfc; |
1421 | |
1422 | d->priority = pn->priority; |
1423 | |
1424 | d->mtu = __le16_to_cpu(pn->mtu); |
1425 | |
1426 | if (cr && d->mtu > s->mtu) |
1427 | d->mtu = s->mtu; |
1428 | |
1429 | return 0; |
1430 | } |
1431 | |
1432 | static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb) |
1433 | { |
1434 | struct rfcomm_pn *pn = (void *) skb->data; |
1435 | struct rfcomm_dlc *d; |
1436 | u8 dlci = pn->dlci; |
1437 | |
1438 | BT_DBG("session %p state %ld dlci %d" , s, s->state, dlci); |
1439 | |
1440 | if (!dlci) |
1441 | return 0; |
1442 | |
1443 | d = rfcomm_dlc_get(s, dlci); |
1444 | if (d) { |
1445 | if (cr) { |
1446 | /* PN request */ |
1447 | rfcomm_apply_pn(d, cr, pn); |
1448 | rfcomm_send_pn(s, cr: 0, d); |
1449 | } else { |
1450 | /* PN response */ |
1451 | switch (d->state) { |
1452 | case BT_CONFIG: |
1453 | rfcomm_apply_pn(d, cr, pn); |
1454 | |
1455 | d->state = BT_CONNECT; |
1456 | rfcomm_send_sabm(s, dlci: d->dlci); |
1457 | break; |
1458 | } |
1459 | } |
1460 | } else { |
1461 | u8 channel = __srv_channel(dlci); |
1462 | |
1463 | if (!cr) |
1464 | return 0; |
1465 | |
1466 | /* PN request for non existing DLC. |
1467 | * Assume incoming connection. */ |
1468 | if (rfcomm_connect_ind(s, channel, d: &d)) { |
1469 | d->dlci = dlci; |
1470 | d->addr = __addr(s->initiator, dlci); |
1471 | rfcomm_dlc_link(s, d); |
1472 | |
1473 | rfcomm_apply_pn(d, cr, pn); |
1474 | |
1475 | d->state = BT_OPEN; |
1476 | rfcomm_send_pn(s, cr: 0, d); |
1477 | } else { |
1478 | rfcomm_send_dm(s, dlci); |
1479 | } |
1480 | } |
1481 | return 0; |
1482 | } |
1483 | |
1484 | static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb) |
1485 | { |
1486 | struct rfcomm_rpn *rpn = (void *) skb->data; |
1487 | u8 dlci = __get_dlci(rpn->dlci); |
1488 | |
1489 | u8 bit_rate = 0; |
1490 | u8 data_bits = 0; |
1491 | u8 stop_bits = 0; |
1492 | u8 parity = 0; |
1493 | u8 flow_ctrl = 0; |
1494 | u8 xon_char = 0; |
1495 | u8 xoff_char = 0; |
1496 | u16 rpn_mask = RFCOMM_RPN_PM_ALL; |
1497 | |
1498 | 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" , |
1499 | dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl, |
1500 | rpn->xon_char, rpn->xoff_char, rpn->param_mask); |
1501 | |
1502 | if (!cr) |
1503 | return 0; |
1504 | |
1505 | if (len == 1) { |
1506 | /* This is a request, return default (according to ETSI TS 07.10) settings */ |
1507 | bit_rate = RFCOMM_RPN_BR_9600; |
1508 | data_bits = RFCOMM_RPN_DATA_8; |
1509 | stop_bits = RFCOMM_RPN_STOP_1; |
1510 | parity = RFCOMM_RPN_PARITY_NONE; |
1511 | flow_ctrl = RFCOMM_RPN_FLOW_NONE; |
1512 | xon_char = RFCOMM_RPN_XON_CHAR; |
1513 | xoff_char = RFCOMM_RPN_XOFF_CHAR; |
1514 | goto rpn_out; |
1515 | } |
1516 | |
1517 | /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit, |
1518 | * no parity, no flow control lines, normal XON/XOFF chars */ |
1519 | |
1520 | if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) { |
1521 | bit_rate = rpn->bit_rate; |
1522 | if (bit_rate > RFCOMM_RPN_BR_230400) { |
1523 | BT_DBG("RPN bit rate mismatch 0x%x" , bit_rate); |
1524 | bit_rate = RFCOMM_RPN_BR_9600; |
1525 | rpn_mask ^= RFCOMM_RPN_PM_BITRATE; |
1526 | } |
1527 | } |
1528 | |
1529 | if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) { |
1530 | data_bits = __get_rpn_data_bits(rpn->line_settings); |
1531 | if (data_bits != RFCOMM_RPN_DATA_8) { |
1532 | BT_DBG("RPN data bits mismatch 0x%x" , data_bits); |
1533 | data_bits = RFCOMM_RPN_DATA_8; |
1534 | rpn_mask ^= RFCOMM_RPN_PM_DATA; |
1535 | } |
1536 | } |
1537 | |
1538 | if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) { |
1539 | stop_bits = __get_rpn_stop_bits(rpn->line_settings); |
1540 | if (stop_bits != RFCOMM_RPN_STOP_1) { |
1541 | BT_DBG("RPN stop bits mismatch 0x%x" , stop_bits); |
1542 | stop_bits = RFCOMM_RPN_STOP_1; |
1543 | rpn_mask ^= RFCOMM_RPN_PM_STOP; |
1544 | } |
1545 | } |
1546 | |
1547 | if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) { |
1548 | parity = __get_rpn_parity(rpn->line_settings); |
1549 | if (parity != RFCOMM_RPN_PARITY_NONE) { |
1550 | BT_DBG("RPN parity mismatch 0x%x" , parity); |
1551 | parity = RFCOMM_RPN_PARITY_NONE; |
1552 | rpn_mask ^= RFCOMM_RPN_PM_PARITY; |
1553 | } |
1554 | } |
1555 | |
1556 | if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) { |
1557 | flow_ctrl = rpn->flow_ctrl; |
1558 | if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) { |
1559 | BT_DBG("RPN flow ctrl mismatch 0x%x" , flow_ctrl); |
1560 | flow_ctrl = RFCOMM_RPN_FLOW_NONE; |
1561 | rpn_mask ^= RFCOMM_RPN_PM_FLOW; |
1562 | } |
1563 | } |
1564 | |
1565 | if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) { |
1566 | xon_char = rpn->xon_char; |
1567 | if (xon_char != RFCOMM_RPN_XON_CHAR) { |
1568 | BT_DBG("RPN XON char mismatch 0x%x" , xon_char); |
1569 | xon_char = RFCOMM_RPN_XON_CHAR; |
1570 | rpn_mask ^= RFCOMM_RPN_PM_XON; |
1571 | } |
1572 | } |
1573 | |
1574 | if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) { |
1575 | xoff_char = rpn->xoff_char; |
1576 | if (xoff_char != RFCOMM_RPN_XOFF_CHAR) { |
1577 | BT_DBG("RPN XOFF char mismatch 0x%x" , xoff_char); |
1578 | xoff_char = RFCOMM_RPN_XOFF_CHAR; |
1579 | rpn_mask ^= RFCOMM_RPN_PM_XOFF; |
1580 | } |
1581 | } |
1582 | |
1583 | rpn_out: |
1584 | rfcomm_send_rpn(s, cr: 0, dlci, bit_rate, data_bits, stop_bits, |
1585 | parity, flow_ctrl_settings: flow_ctrl, xon_char, xoff_char, param_mask: rpn_mask); |
1586 | |
1587 | return 0; |
1588 | } |
1589 | |
1590 | static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb) |
1591 | { |
1592 | struct rfcomm_rls *rls = (void *) skb->data; |
1593 | u8 dlci = __get_dlci(rls->dlci); |
1594 | |
1595 | BT_DBG("dlci %d cr %d status 0x%x" , dlci, cr, rls->status); |
1596 | |
1597 | if (!cr) |
1598 | return 0; |
1599 | |
1600 | /* We should probably do something with this information here. But |
1601 | * for now it's sufficient just to reply -- Bluetooth 1.1 says it's |
1602 | * mandatory to recognise and respond to RLS */ |
1603 | |
1604 | rfcomm_send_rls(s, cr: 0, dlci, status: rls->status); |
1605 | |
1606 | return 0; |
1607 | } |
1608 | |
1609 | static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb) |
1610 | { |
1611 | struct rfcomm_msc *msc = (void *) skb->data; |
1612 | struct rfcomm_dlc *d; |
1613 | u8 dlci = __get_dlci(msc->dlci); |
1614 | |
1615 | BT_DBG("dlci %d cr %d v24 0x%x" , dlci, cr, msc->v24_sig); |
1616 | |
1617 | d = rfcomm_dlc_get(s, dlci); |
1618 | if (!d) |
1619 | return 0; |
1620 | |
1621 | if (cr) { |
1622 | if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc) |
1623 | set_bit(RFCOMM_TX_THROTTLED, addr: &d->flags); |
1624 | else |
1625 | clear_bit(RFCOMM_TX_THROTTLED, addr: &d->flags); |
1626 | |
1627 | rfcomm_dlc_lock(d); |
1628 | |
1629 | d->remote_v24_sig = msc->v24_sig; |
1630 | |
1631 | if (d->modem_status) |
1632 | d->modem_status(d, msc->v24_sig); |
1633 | |
1634 | rfcomm_dlc_unlock(d); |
1635 | |
1636 | rfcomm_send_msc(s, cr: 0, dlci, v24_sig: msc->v24_sig); |
1637 | |
1638 | d->mscex |= RFCOMM_MSCEX_RX; |
1639 | } else |
1640 | d->mscex |= RFCOMM_MSCEX_TX; |
1641 | |
1642 | return 0; |
1643 | } |
1644 | |
1645 | static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb) |
1646 | { |
1647 | struct rfcomm_mcc *mcc = (void *) skb->data; |
1648 | u8 type, cr, len; |
1649 | |
1650 | cr = __test_cr(mcc->type); |
1651 | type = __get_mcc_type(mcc->type); |
1652 | len = __get_mcc_len(mcc->len); |
1653 | |
1654 | BT_DBG("%p type 0x%x cr %d" , s, type, cr); |
1655 | |
1656 | skb_pull(skb, len: 2); |
1657 | |
1658 | switch (type) { |
1659 | case RFCOMM_PN: |
1660 | rfcomm_recv_pn(s, cr, skb); |
1661 | break; |
1662 | |
1663 | case RFCOMM_RPN: |
1664 | rfcomm_recv_rpn(s, cr, len, skb); |
1665 | break; |
1666 | |
1667 | case RFCOMM_RLS: |
1668 | rfcomm_recv_rls(s, cr, skb); |
1669 | break; |
1670 | |
1671 | case RFCOMM_MSC: |
1672 | rfcomm_recv_msc(s, cr, skb); |
1673 | break; |
1674 | |
1675 | case RFCOMM_FCOFF: |
1676 | if (cr) { |
1677 | set_bit(RFCOMM_TX_THROTTLED, addr: &s->flags); |
1678 | rfcomm_send_fcoff(s, cr: 0); |
1679 | } |
1680 | break; |
1681 | |
1682 | case RFCOMM_FCON: |
1683 | if (cr) { |
1684 | clear_bit(RFCOMM_TX_THROTTLED, addr: &s->flags); |
1685 | rfcomm_send_fcon(s, cr: 0); |
1686 | } |
1687 | break; |
1688 | |
1689 | case RFCOMM_TEST: |
1690 | if (cr) |
1691 | rfcomm_send_test(s, cr: 0, pattern: skb->data, len: skb->len); |
1692 | break; |
1693 | |
1694 | case RFCOMM_NSC: |
1695 | break; |
1696 | |
1697 | default: |
1698 | BT_ERR("Unknown control type 0x%02x" , type); |
1699 | rfcomm_send_nsc(s, cr, type); |
1700 | break; |
1701 | } |
1702 | return 0; |
1703 | } |
1704 | |
1705 | static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb) |
1706 | { |
1707 | struct rfcomm_dlc *d; |
1708 | |
1709 | BT_DBG("session %p state %ld dlci %d pf %d" , s, s->state, dlci, pf); |
1710 | |
1711 | d = rfcomm_dlc_get(s, dlci); |
1712 | if (!d) { |
1713 | rfcomm_send_dm(s, dlci); |
1714 | goto drop; |
1715 | } |
1716 | |
1717 | if (pf && d->cfc) { |
1718 | u8 credits = *(u8 *) skb->data; skb_pull(skb, len: 1); |
1719 | |
1720 | d->tx_credits += credits; |
1721 | if (d->tx_credits) |
1722 | clear_bit(RFCOMM_TX_THROTTLED, addr: &d->flags); |
1723 | } |
1724 | |
1725 | if (skb->len && d->state == BT_CONNECTED) { |
1726 | rfcomm_dlc_lock(d); |
1727 | d->rx_credits--; |
1728 | d->data_ready(d, skb); |
1729 | rfcomm_dlc_unlock(d); |
1730 | return 0; |
1731 | } |
1732 | |
1733 | drop: |
1734 | kfree_skb(skb); |
1735 | return 0; |
1736 | } |
1737 | |
1738 | static struct rfcomm_session *rfcomm_recv_frame(struct rfcomm_session *s, |
1739 | struct sk_buff *skb) |
1740 | { |
1741 | struct rfcomm_hdr *hdr = (void *) skb->data; |
1742 | u8 type, dlci, fcs; |
1743 | |
1744 | if (!s) { |
1745 | /* no session, so free socket data */ |
1746 | kfree_skb(skb); |
1747 | return s; |
1748 | } |
1749 | |
1750 | dlci = __get_dlci(hdr->addr); |
1751 | type = __get_type(hdr->ctrl); |
1752 | |
1753 | /* Trim FCS */ |
1754 | skb->len--; skb->tail--; |
1755 | fcs = *(u8 *)skb_tail_pointer(skb); |
1756 | |
1757 | if (__check_fcs(data: skb->data, type, fcs)) { |
1758 | BT_ERR("bad checksum in packet" ); |
1759 | kfree_skb(skb); |
1760 | return s; |
1761 | } |
1762 | |
1763 | if (__test_ea(hdr->len)) |
1764 | skb_pull(skb, len: 3); |
1765 | else |
1766 | skb_pull(skb, len: 4); |
1767 | |
1768 | switch (type) { |
1769 | case RFCOMM_SABM: |
1770 | if (__test_pf(hdr->ctrl)) |
1771 | rfcomm_recv_sabm(s, dlci); |
1772 | break; |
1773 | |
1774 | case RFCOMM_DISC: |
1775 | if (__test_pf(hdr->ctrl)) |
1776 | s = rfcomm_recv_disc(s, dlci); |
1777 | break; |
1778 | |
1779 | case RFCOMM_UA: |
1780 | if (__test_pf(hdr->ctrl)) |
1781 | s = rfcomm_recv_ua(s, dlci); |
1782 | break; |
1783 | |
1784 | case RFCOMM_DM: |
1785 | s = rfcomm_recv_dm(s, dlci); |
1786 | break; |
1787 | |
1788 | case RFCOMM_UIH: |
1789 | if (dlci) { |
1790 | rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb); |
1791 | return s; |
1792 | } |
1793 | rfcomm_recv_mcc(s, skb); |
1794 | break; |
1795 | |
1796 | default: |
1797 | BT_ERR("Unknown packet type 0x%02x" , type); |
1798 | break; |
1799 | } |
1800 | kfree_skb(skb); |
1801 | return s; |
1802 | } |
1803 | |
1804 | /* ---- Connection and data processing ---- */ |
1805 | |
1806 | static void rfcomm_process_connect(struct rfcomm_session *s) |
1807 | { |
1808 | struct rfcomm_dlc *d, *n; |
1809 | |
1810 | BT_DBG("session %p state %ld" , s, s->state); |
1811 | |
1812 | list_for_each_entry_safe(d, n, &s->dlcs, list) { |
1813 | if (d->state == BT_CONFIG) { |
1814 | d->mtu = s->mtu; |
1815 | if (rfcomm_check_security(d)) { |
1816 | rfcomm_send_pn(s, cr: 1, d); |
1817 | } else { |
1818 | set_bit(RFCOMM_AUTH_PENDING, addr: &d->flags); |
1819 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); |
1820 | } |
1821 | } |
1822 | } |
1823 | } |
1824 | |
1825 | /* Send data queued for the DLC. |
1826 | * Return number of frames left in the queue. |
1827 | */ |
1828 | static int rfcomm_process_tx(struct rfcomm_dlc *d) |
1829 | { |
1830 | struct sk_buff *skb; |
1831 | int err; |
1832 | |
1833 | BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d" , |
1834 | d, d->state, d->cfc, d->rx_credits, d->tx_credits); |
1835 | |
1836 | /* Send pending MSC */ |
1837 | if (test_and_clear_bit(RFCOMM_MSC_PENDING, addr: &d->flags)) |
1838 | rfcomm_send_msc(s: d->session, cr: 1, dlci: d->dlci, v24_sig: d->v24_sig); |
1839 | |
1840 | if (d->cfc) { |
1841 | /* CFC enabled. |
1842 | * Give them some credits */ |
1843 | if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) && |
1844 | d->rx_credits <= (d->cfc >> 2)) { |
1845 | rfcomm_send_credits(s: d->session, addr: d->addr, credits: d->cfc - d->rx_credits); |
1846 | d->rx_credits = d->cfc; |
1847 | } |
1848 | } else { |
1849 | /* CFC disabled. |
1850 | * Give ourselves some credits */ |
1851 | d->tx_credits = 5; |
1852 | } |
1853 | |
1854 | if (test_bit(RFCOMM_TX_THROTTLED, &d->flags)) |
1855 | return skb_queue_len(list_: &d->tx_queue); |
1856 | |
1857 | while (d->tx_credits && (skb = skb_dequeue(list: &d->tx_queue))) { |
1858 | err = rfcomm_send_frame(s: d->session, data: skb->data, len: skb->len); |
1859 | if (err < 0) { |
1860 | skb_queue_head(list: &d->tx_queue, newsk: skb); |
1861 | break; |
1862 | } |
1863 | kfree_skb(skb); |
1864 | d->tx_credits--; |
1865 | } |
1866 | |
1867 | if (d->cfc && !d->tx_credits) { |
1868 | /* We're out of TX credits. |
1869 | * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */ |
1870 | set_bit(RFCOMM_TX_THROTTLED, addr: &d->flags); |
1871 | } |
1872 | |
1873 | return skb_queue_len(list_: &d->tx_queue); |
1874 | } |
1875 | |
1876 | static void rfcomm_process_dlcs(struct rfcomm_session *s) |
1877 | { |
1878 | struct rfcomm_dlc *d, *n; |
1879 | |
1880 | BT_DBG("session %p state %ld" , s, s->state); |
1881 | |
1882 | list_for_each_entry_safe(d, n, &s->dlcs, list) { |
1883 | if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) { |
1884 | __rfcomm_dlc_close(d, ETIMEDOUT); |
1885 | continue; |
1886 | } |
1887 | |
1888 | if (test_bit(RFCOMM_ENC_DROP, &d->flags)) { |
1889 | __rfcomm_dlc_close(d, ECONNREFUSED); |
1890 | continue; |
1891 | } |
1892 | |
1893 | if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, addr: &d->flags)) { |
1894 | rfcomm_dlc_clear_timer(d); |
1895 | if (d->out) { |
1896 | rfcomm_send_pn(s, cr: 1, d); |
1897 | rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); |
1898 | } else { |
1899 | if (d->defer_setup) { |
1900 | set_bit(RFCOMM_DEFER_SETUP, addr: &d->flags); |
1901 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); |
1902 | |
1903 | rfcomm_dlc_lock(d); |
1904 | d->state = BT_CONNECT2; |
1905 | d->state_change(d, 0); |
1906 | rfcomm_dlc_unlock(d); |
1907 | } else |
1908 | rfcomm_dlc_accept(d); |
1909 | } |
1910 | continue; |
1911 | } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, addr: &d->flags)) { |
1912 | rfcomm_dlc_clear_timer(d); |
1913 | if (!d->out) |
1914 | rfcomm_send_dm(s, dlci: d->dlci); |
1915 | else |
1916 | d->state = BT_CLOSED; |
1917 | __rfcomm_dlc_close(d, ECONNREFUSED); |
1918 | continue; |
1919 | } |
1920 | |
1921 | if (test_bit(RFCOMM_SEC_PENDING, &d->flags)) |
1922 | continue; |
1923 | |
1924 | if (test_bit(RFCOMM_TX_THROTTLED, &s->flags)) |
1925 | continue; |
1926 | |
1927 | if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) && |
1928 | d->mscex == RFCOMM_MSCEX_OK) |
1929 | rfcomm_process_tx(d); |
1930 | } |
1931 | } |
1932 | |
1933 | static struct rfcomm_session *rfcomm_process_rx(struct rfcomm_session *s) |
1934 | { |
1935 | struct socket *sock = s->sock; |
1936 | struct sock *sk = sock->sk; |
1937 | struct sk_buff *skb; |
1938 | |
1939 | BT_DBG("session %p state %ld qlen %d" , s, s->state, skb_queue_len(&sk->sk_receive_queue)); |
1940 | |
1941 | /* Get data directly from socket receive queue without copying it. */ |
1942 | while ((skb = skb_dequeue(list: &sk->sk_receive_queue))) { |
1943 | skb_orphan(skb); |
1944 | if (!skb_linearize(skb)) { |
1945 | s = rfcomm_recv_frame(s, skb); |
1946 | if (!s) |
1947 | break; |
1948 | } else { |
1949 | kfree_skb(skb); |
1950 | } |
1951 | } |
1952 | |
1953 | if (s && (sk->sk_state == BT_CLOSED)) |
1954 | s = rfcomm_session_close(s, err: sk->sk_err); |
1955 | |
1956 | return s; |
1957 | } |
1958 | |
1959 | static void rfcomm_accept_connection(struct rfcomm_session *s) |
1960 | { |
1961 | struct socket *sock = s->sock, *nsock; |
1962 | int err; |
1963 | |
1964 | /* Fast check for a new connection. |
1965 | * Avoids unnesesary socket allocations. */ |
1966 | if (list_empty(head: &bt_sk(sock->sk)->accept_q)) |
1967 | return; |
1968 | |
1969 | BT_DBG("session %p" , s); |
1970 | |
1971 | err = kernel_accept(sock, newsock: &nsock, O_NONBLOCK); |
1972 | if (err < 0) |
1973 | return; |
1974 | |
1975 | /* Set our callbacks */ |
1976 | nsock->sk->sk_data_ready = rfcomm_l2data_ready; |
1977 | nsock->sk->sk_state_change = rfcomm_l2state_change; |
1978 | |
1979 | s = rfcomm_session_add(sock: nsock, state: BT_OPEN); |
1980 | if (s) { |
1981 | /* We should adjust MTU on incoming sessions. |
1982 | * L2CAP MTU minus UIH header and FCS. */ |
1983 | s->mtu = min(l2cap_pi(nsock->sk)->chan->omtu, |
1984 | l2cap_pi(nsock->sk)->chan->imtu) - 5; |
1985 | |
1986 | rfcomm_schedule(); |
1987 | } else |
1988 | sock_release(sock: nsock); |
1989 | } |
1990 | |
1991 | static struct rfcomm_session *rfcomm_check_connection(struct rfcomm_session *s) |
1992 | { |
1993 | struct sock *sk = s->sock->sk; |
1994 | |
1995 | BT_DBG("%p state %ld" , s, s->state); |
1996 | |
1997 | switch (sk->sk_state) { |
1998 | case BT_CONNECTED: |
1999 | s->state = BT_CONNECT; |
2000 | |
2001 | /* We can adjust MTU on outgoing sessions. |
2002 | * L2CAP MTU minus UIH header and FCS. */ |
2003 | s->mtu = min(l2cap_pi(sk)->chan->omtu, l2cap_pi(sk)->chan->imtu) - 5; |
2004 | |
2005 | rfcomm_send_sabm(s, dlci: 0); |
2006 | break; |
2007 | |
2008 | case BT_CLOSED: |
2009 | s = rfcomm_session_close(s, err: sk->sk_err); |
2010 | break; |
2011 | } |
2012 | return s; |
2013 | } |
2014 | |
2015 | static void rfcomm_process_sessions(void) |
2016 | { |
2017 | struct rfcomm_session *s, *n; |
2018 | |
2019 | rfcomm_lock(); |
2020 | |
2021 | list_for_each_entry_safe(s, n, &session_list, list) { |
2022 | if (test_and_clear_bit(RFCOMM_TIMED_OUT, addr: &s->flags)) { |
2023 | s->state = BT_DISCONN; |
2024 | rfcomm_send_disc(s, dlci: 0); |
2025 | continue; |
2026 | } |
2027 | |
2028 | switch (s->state) { |
2029 | case BT_LISTEN: |
2030 | rfcomm_accept_connection(s); |
2031 | continue; |
2032 | |
2033 | case BT_BOUND: |
2034 | s = rfcomm_check_connection(s); |
2035 | break; |
2036 | |
2037 | default: |
2038 | s = rfcomm_process_rx(s); |
2039 | break; |
2040 | } |
2041 | |
2042 | if (s) |
2043 | rfcomm_process_dlcs(s); |
2044 | } |
2045 | |
2046 | rfcomm_unlock(); |
2047 | } |
2048 | |
2049 | static int rfcomm_add_listener(bdaddr_t *ba) |
2050 | { |
2051 | struct sockaddr_l2 addr; |
2052 | struct socket *sock; |
2053 | struct sock *sk; |
2054 | struct rfcomm_session *s; |
2055 | int err = 0; |
2056 | |
2057 | /* Create socket */ |
2058 | err = rfcomm_l2sock_create(sock: &sock); |
2059 | if (err < 0) { |
2060 | BT_ERR("Create socket failed %d" , err); |
2061 | return err; |
2062 | } |
2063 | |
2064 | /* Bind socket */ |
2065 | bacpy(dst: &addr.l2_bdaddr, src: ba); |
2066 | addr.l2_family = AF_BLUETOOTH; |
2067 | addr.l2_psm = cpu_to_le16(L2CAP_PSM_RFCOMM); |
2068 | addr.l2_cid = 0; |
2069 | addr.l2_bdaddr_type = BDADDR_BREDR; |
2070 | err = kernel_bind(sock, addr: (struct sockaddr *) &addr, addrlen: sizeof(addr)); |
2071 | if (err < 0) { |
2072 | BT_ERR("Bind failed %d" , err); |
2073 | goto failed; |
2074 | } |
2075 | |
2076 | /* Set L2CAP options */ |
2077 | sk = sock->sk; |
2078 | lock_sock(sk); |
2079 | /* Set MTU to 0 so L2CAP can auto select the MTU */ |
2080 | l2cap_pi(sk)->chan->imtu = 0; |
2081 | release_sock(sk); |
2082 | |
2083 | /* Start listening on the socket */ |
2084 | err = kernel_listen(sock, backlog: 10); |
2085 | if (err) { |
2086 | BT_ERR("Listen failed %d" , err); |
2087 | goto failed; |
2088 | } |
2089 | |
2090 | /* Add listening session */ |
2091 | s = rfcomm_session_add(sock, state: BT_LISTEN); |
2092 | if (!s) { |
2093 | err = -ENOMEM; |
2094 | goto failed; |
2095 | } |
2096 | |
2097 | return 0; |
2098 | failed: |
2099 | sock_release(sock); |
2100 | return err; |
2101 | } |
2102 | |
2103 | static void rfcomm_kill_listener(void) |
2104 | { |
2105 | struct rfcomm_session *s, *n; |
2106 | |
2107 | BT_DBG("" ); |
2108 | |
2109 | list_for_each_entry_safe(s, n, &session_list, list) |
2110 | rfcomm_session_del(s); |
2111 | } |
2112 | |
2113 | static int rfcomm_run(void *unused) |
2114 | { |
2115 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
2116 | BT_DBG("" ); |
2117 | |
2118 | set_user_nice(current, nice: -10); |
2119 | |
2120 | rfcomm_add_listener(BDADDR_ANY); |
2121 | |
2122 | add_wait_queue(wq_head: &rfcomm_wq, wq_entry: &wait); |
2123 | while (!kthread_should_stop()) { |
2124 | |
2125 | /* Process stuff */ |
2126 | rfcomm_process_sessions(); |
2127 | |
2128 | wait_woken(wq_entry: &wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); |
2129 | } |
2130 | remove_wait_queue(wq_head: &rfcomm_wq, wq_entry: &wait); |
2131 | |
2132 | rfcomm_kill_listener(); |
2133 | |
2134 | return 0; |
2135 | } |
2136 | |
2137 | static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt) |
2138 | { |
2139 | struct rfcomm_session *s; |
2140 | struct rfcomm_dlc *d, *n; |
2141 | |
2142 | BT_DBG("conn %p status 0x%02x encrypt 0x%02x" , conn, status, encrypt); |
2143 | |
2144 | s = rfcomm_session_get(src: &conn->hdev->bdaddr, dst: &conn->dst); |
2145 | if (!s) |
2146 | return; |
2147 | |
2148 | list_for_each_entry_safe(d, n, &s->dlcs, list) { |
2149 | if (test_and_clear_bit(RFCOMM_SEC_PENDING, addr: &d->flags)) { |
2150 | rfcomm_dlc_clear_timer(d); |
2151 | if (status || encrypt == 0x00) { |
2152 | set_bit(RFCOMM_ENC_DROP, addr: &d->flags); |
2153 | continue; |
2154 | } |
2155 | } |
2156 | |
2157 | if (d->state == BT_CONNECTED && !status && encrypt == 0x00) { |
2158 | if (d->sec_level == BT_SECURITY_MEDIUM) { |
2159 | set_bit(RFCOMM_SEC_PENDING, addr: &d->flags); |
2160 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); |
2161 | continue; |
2162 | } else if (d->sec_level == BT_SECURITY_HIGH || |
2163 | d->sec_level == BT_SECURITY_FIPS) { |
2164 | set_bit(RFCOMM_ENC_DROP, addr: &d->flags); |
2165 | continue; |
2166 | } |
2167 | } |
2168 | |
2169 | if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, addr: &d->flags)) |
2170 | continue; |
2171 | |
2172 | if (!status && hci_conn_check_secure(conn, sec_level: d->sec_level)) |
2173 | set_bit(RFCOMM_AUTH_ACCEPT, addr: &d->flags); |
2174 | else |
2175 | set_bit(RFCOMM_AUTH_REJECT, addr: &d->flags); |
2176 | } |
2177 | |
2178 | rfcomm_schedule(); |
2179 | } |
2180 | |
2181 | static struct hci_cb rfcomm_cb = { |
2182 | .name = "RFCOMM" , |
2183 | .security_cfm = rfcomm_security_cfm |
2184 | }; |
2185 | |
2186 | static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x) |
2187 | { |
2188 | struct rfcomm_session *s; |
2189 | |
2190 | rfcomm_lock(); |
2191 | |
2192 | list_for_each_entry(s, &session_list, list) { |
2193 | struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan; |
2194 | struct rfcomm_dlc *d; |
2195 | list_for_each_entry(d, &s->dlcs, list) { |
2196 | seq_printf(m: f, fmt: "%pMR %pMR %ld %d %d %d %d\n" , |
2197 | &chan->src, &chan->dst, |
2198 | d->state, d->dlci, d->mtu, |
2199 | d->rx_credits, d->tx_credits); |
2200 | } |
2201 | } |
2202 | |
2203 | rfcomm_unlock(); |
2204 | |
2205 | return 0; |
2206 | } |
2207 | |
2208 | DEFINE_SHOW_ATTRIBUTE(rfcomm_dlc_debugfs); |
2209 | |
2210 | static struct dentry *rfcomm_dlc_debugfs; |
2211 | |
2212 | /* ---- Initialization ---- */ |
2213 | static int __init rfcomm_init(void) |
2214 | { |
2215 | int err; |
2216 | |
2217 | hci_register_cb(hcb: &rfcomm_cb); |
2218 | |
2219 | rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd" ); |
2220 | if (IS_ERR(ptr: rfcomm_thread)) { |
2221 | err = PTR_ERR(ptr: rfcomm_thread); |
2222 | goto unregister; |
2223 | } |
2224 | |
2225 | err = rfcomm_init_ttys(); |
2226 | if (err < 0) |
2227 | goto stop; |
2228 | |
2229 | err = rfcomm_init_sockets(); |
2230 | if (err < 0) |
2231 | goto cleanup; |
2232 | |
2233 | BT_INFO("RFCOMM ver %s" , VERSION); |
2234 | |
2235 | if (IS_ERR_OR_NULL(ptr: bt_debugfs)) |
2236 | return 0; |
2237 | |
2238 | rfcomm_dlc_debugfs = debugfs_create_file(name: "rfcomm_dlc" , mode: 0444, |
2239 | parent: bt_debugfs, NULL, |
2240 | fops: &rfcomm_dlc_debugfs_fops); |
2241 | |
2242 | return 0; |
2243 | |
2244 | cleanup: |
2245 | rfcomm_cleanup_ttys(); |
2246 | |
2247 | stop: |
2248 | kthread_stop(k: rfcomm_thread); |
2249 | |
2250 | unregister: |
2251 | hci_unregister_cb(hcb: &rfcomm_cb); |
2252 | |
2253 | return err; |
2254 | } |
2255 | |
2256 | static void __exit rfcomm_exit(void) |
2257 | { |
2258 | debugfs_remove(dentry: rfcomm_dlc_debugfs); |
2259 | |
2260 | hci_unregister_cb(hcb: &rfcomm_cb); |
2261 | |
2262 | kthread_stop(k: rfcomm_thread); |
2263 | |
2264 | rfcomm_cleanup_ttys(); |
2265 | |
2266 | rfcomm_cleanup_sockets(); |
2267 | } |
2268 | |
2269 | module_init(rfcomm_init); |
2270 | module_exit(rfcomm_exit); |
2271 | |
2272 | module_param(disable_cfc, bool, 0644); |
2273 | MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control" ); |
2274 | |
2275 | module_param(channel_mtu, int, 0644); |
2276 | MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel" ); |
2277 | |
2278 | module_param(l2cap_ertm, bool, 0644); |
2279 | MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection" ); |
2280 | |
2281 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>" ); |
2282 | MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION); |
2283 | MODULE_VERSION(VERSION); |
2284 | MODULE_LICENSE("GPL" ); |
2285 | MODULE_ALIAS("bt-proto-3" ); |
2286 | |