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Commit | Line | Data |
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1 | /* | |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> | |
5 | Copyright (C) 2010 Google Inc. | |
6 | ||
7 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License version 2 as | |
11 | published by the Free Software Foundation; | |
12 | ||
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
16 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
17 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
18 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
19 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
20 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
21 | ||
22 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
23 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
24 | SOFTWARE IS DISCLAIMED. | |
25 | */ | |
26 | ||
27 | /* Bluetooth L2CAP sockets. */ | |
28 | ||
29 | #include <net/bluetooth/bluetooth.h> | |
30 | #include <net/bluetooth/hci_core.h> | |
31 | #include <net/bluetooth/l2cap.h> | |
32 | ||
33 | /* ---- L2CAP timers ---- */ | |
34 | static void l2cap_sock_timeout(unsigned long arg) | |
35 | { | |
36 | struct sock *sk = (struct sock *) arg; | |
37 | int reason; | |
38 | ||
39 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
40 | ||
41 | bh_lock_sock(sk); | |
42 | ||
43 | if (sock_owned_by_user(sk)) { | |
44 | /* sk is owned by user. Try again later */ | |
45 | l2cap_sock_set_timer(sk, HZ / 5); | |
46 | bh_unlock_sock(sk); | |
47 | sock_put(sk); | |
48 | return; | |
49 | } | |
50 | ||
51 | if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) | |
52 | reason = ECONNREFUSED; | |
53 | else if (sk->sk_state == BT_CONNECT && | |
54 | l2cap_pi(sk)->chan->sec_level != BT_SECURITY_SDP) | |
55 | reason = ECONNREFUSED; | |
56 | else | |
57 | reason = ETIMEDOUT; | |
58 | ||
59 | __l2cap_sock_close(sk, reason); | |
60 | ||
61 | bh_unlock_sock(sk); | |
62 | ||
63 | l2cap_sock_kill(sk); | |
64 | sock_put(sk); | |
65 | } | |
66 | ||
67 | void l2cap_sock_set_timer(struct sock *sk, long timeout) | |
68 | { | |
69 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); | |
70 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); | |
71 | } | |
72 | ||
73 | void l2cap_sock_clear_timer(struct sock *sk) | |
74 | { | |
75 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
76 | sk_stop_timer(sk, &sk->sk_timer); | |
77 | } | |
78 | ||
79 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) | |
80 | { | |
81 | struct sock *sk; | |
82 | struct hlist_node *node; | |
83 | sk_for_each(sk, node, &l2cap_sk_list.head) | |
84 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) | |
85 | goto found; | |
86 | sk = NULL; | |
87 | found: | |
88 | return sk; | |
89 | } | |
90 | ||
91 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) | |
92 | { | |
93 | struct sock *sk = sock->sk; | |
94 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
95 | struct sockaddr_l2 la; | |
96 | int len, err = 0; | |
97 | ||
98 | BT_DBG("sk %p", sk); | |
99 | ||
100 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
101 | return -EINVAL; | |
102 | ||
103 | memset(&la, 0, sizeof(la)); | |
104 | len = min_t(unsigned int, sizeof(la), alen); | |
105 | memcpy(&la, addr, len); | |
106 | ||
107 | if (la.l2_cid && la.l2_psm) | |
108 | return -EINVAL; | |
109 | ||
110 | lock_sock(sk); | |
111 | ||
112 | if (sk->sk_state != BT_OPEN) { | |
113 | err = -EBADFD; | |
114 | goto done; | |
115 | } | |
116 | ||
117 | if (la.l2_psm) { | |
118 | __u16 psm = __le16_to_cpu(la.l2_psm); | |
119 | ||
120 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
121 | if ((psm & 0x0101) != 0x0001) { | |
122 | err = -EINVAL; | |
123 | goto done; | |
124 | } | |
125 | ||
126 | /* Restrict usage of well-known PSMs */ | |
127 | if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) { | |
128 | err = -EACCES; | |
129 | goto done; | |
130 | } | |
131 | } | |
132 | ||
133 | write_lock_bh(&l2cap_sk_list.lock); | |
134 | ||
135 | if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { | |
136 | err = -EADDRINUSE; | |
137 | } else { | |
138 | /* Save source address */ | |
139 | bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); | |
140 | l2cap_pi(sk)->psm = la.l2_psm; | |
141 | l2cap_pi(sk)->sport = la.l2_psm; | |
142 | sk->sk_state = BT_BOUND; | |
143 | ||
144 | if (__le16_to_cpu(la.l2_psm) == 0x0001 || | |
145 | __le16_to_cpu(la.l2_psm) == 0x0003) | |
146 | chan->sec_level = BT_SECURITY_SDP; | |
147 | } | |
148 | ||
149 | if (la.l2_cid) | |
150 | l2cap_pi(sk)->scid = la.l2_cid; | |
151 | ||
152 | write_unlock_bh(&l2cap_sk_list.lock); | |
153 | ||
154 | done: | |
155 | release_sock(sk); | |
156 | return err; | |
157 | } | |
158 | ||
159 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
160 | { | |
161 | struct sock *sk = sock->sk; | |
162 | struct sockaddr_l2 la; | |
163 | int len, err = 0; | |
164 | ||
165 | BT_DBG("sk %p", sk); | |
166 | ||
167 | if (!addr || alen < sizeof(addr->sa_family) || | |
168 | addr->sa_family != AF_BLUETOOTH) | |
169 | return -EINVAL; | |
170 | ||
171 | memset(&la, 0, sizeof(la)); | |
172 | len = min_t(unsigned int, sizeof(la), alen); | |
173 | memcpy(&la, addr, len); | |
174 | ||
175 | if (la.l2_cid && la.l2_psm) | |
176 | return -EINVAL; | |
177 | ||
178 | lock_sock(sk); | |
179 | ||
180 | if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) | |
181 | && !(la.l2_psm || la.l2_cid)) { | |
182 | err = -EINVAL; | |
183 | goto done; | |
184 | } | |
185 | ||
186 | switch (l2cap_pi(sk)->mode) { | |
187 | case L2CAP_MODE_BASIC: | |
188 | break; | |
189 | case L2CAP_MODE_ERTM: | |
190 | case L2CAP_MODE_STREAMING: | |
191 | if (!disable_ertm) | |
192 | break; | |
193 | /* fall through */ | |
194 | default: | |
195 | err = -ENOTSUPP; | |
196 | goto done; | |
197 | } | |
198 | ||
199 | switch (sk->sk_state) { | |
200 | case BT_CONNECT: | |
201 | case BT_CONNECT2: | |
202 | case BT_CONFIG: | |
203 | /* Already connecting */ | |
204 | goto wait; | |
205 | ||
206 | case BT_CONNECTED: | |
207 | /* Already connected */ | |
208 | err = -EISCONN; | |
209 | goto done; | |
210 | ||
211 | case BT_OPEN: | |
212 | case BT_BOUND: | |
213 | /* Can connect */ | |
214 | break; | |
215 | ||
216 | default: | |
217 | err = -EBADFD; | |
218 | goto done; | |
219 | } | |
220 | ||
221 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
222 | if ((__le16_to_cpu(la.l2_psm) & 0x0101) != 0x0001 && | |
223 | sk->sk_type != SOCK_RAW && !la.l2_cid) { | |
224 | err = -EINVAL; | |
225 | goto done; | |
226 | } | |
227 | ||
228 | /* Set destination address and psm */ | |
229 | bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); | |
230 | l2cap_pi(sk)->psm = la.l2_psm; | |
231 | l2cap_pi(sk)->dcid = la.l2_cid; | |
232 | ||
233 | err = l2cap_chan_connect(l2cap_pi(sk)->chan); | |
234 | if (err) | |
235 | goto done; | |
236 | ||
237 | wait: | |
238 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
239 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
240 | done: | |
241 | release_sock(sk); | |
242 | return err; | |
243 | } | |
244 | ||
245 | static int l2cap_sock_listen(struct socket *sock, int backlog) | |
246 | { | |
247 | struct sock *sk = sock->sk; | |
248 | int err = 0; | |
249 | ||
250 | BT_DBG("sk %p backlog %d", sk, backlog); | |
251 | ||
252 | lock_sock(sk); | |
253 | ||
254 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) | |
255 | || sk->sk_state != BT_BOUND) { | |
256 | err = -EBADFD; | |
257 | goto done; | |
258 | } | |
259 | ||
260 | switch (l2cap_pi(sk)->mode) { | |
261 | case L2CAP_MODE_BASIC: | |
262 | break; | |
263 | case L2CAP_MODE_ERTM: | |
264 | case L2CAP_MODE_STREAMING: | |
265 | if (!disable_ertm) | |
266 | break; | |
267 | /* fall through */ | |
268 | default: | |
269 | err = -ENOTSUPP; | |
270 | goto done; | |
271 | } | |
272 | ||
273 | if (!l2cap_pi(sk)->psm && !l2cap_pi(sk)->scid) { | |
274 | bdaddr_t *src = &bt_sk(sk)->src; | |
275 | u16 psm; | |
276 | ||
277 | err = -EINVAL; | |
278 | ||
279 | write_lock_bh(&l2cap_sk_list.lock); | |
280 | ||
281 | for (psm = 0x1001; psm < 0x1100; psm += 2) | |
282 | if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { | |
283 | l2cap_pi(sk)->psm = cpu_to_le16(psm); | |
284 | l2cap_pi(sk)->sport = cpu_to_le16(psm); | |
285 | err = 0; | |
286 | break; | |
287 | } | |
288 | ||
289 | write_unlock_bh(&l2cap_sk_list.lock); | |
290 | ||
291 | if (err < 0) | |
292 | goto done; | |
293 | } | |
294 | ||
295 | sk->sk_max_ack_backlog = backlog; | |
296 | sk->sk_ack_backlog = 0; | |
297 | sk->sk_state = BT_LISTEN; | |
298 | ||
299 | done: | |
300 | release_sock(sk); | |
301 | return err; | |
302 | } | |
303 | ||
304 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
305 | { | |
306 | DECLARE_WAITQUEUE(wait, current); | |
307 | struct sock *sk = sock->sk, *nsk; | |
308 | long timeo; | |
309 | int err = 0; | |
310 | ||
311 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
312 | ||
313 | if (sk->sk_state != BT_LISTEN) { | |
314 | err = -EBADFD; | |
315 | goto done; | |
316 | } | |
317 | ||
318 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
319 | ||
320 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
321 | ||
322 | /* Wait for an incoming connection. (wake-one). */ | |
323 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
324 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { | |
325 | set_current_state(TASK_INTERRUPTIBLE); | |
326 | if (!timeo) { | |
327 | err = -EAGAIN; | |
328 | break; | |
329 | } | |
330 | ||
331 | release_sock(sk); | |
332 | timeo = schedule_timeout(timeo); | |
333 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
334 | ||
335 | if (sk->sk_state != BT_LISTEN) { | |
336 | err = -EBADFD; | |
337 | break; | |
338 | } | |
339 | ||
340 | if (signal_pending(current)) { | |
341 | err = sock_intr_errno(timeo); | |
342 | break; | |
343 | } | |
344 | } | |
345 | set_current_state(TASK_RUNNING); | |
346 | remove_wait_queue(sk_sleep(sk), &wait); | |
347 | ||
348 | if (err) | |
349 | goto done; | |
350 | ||
351 | newsock->state = SS_CONNECTED; | |
352 | ||
353 | BT_DBG("new socket %p", nsk); | |
354 | ||
355 | done: | |
356 | release_sock(sk); | |
357 | return err; | |
358 | } | |
359 | ||
360 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
361 | { | |
362 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
363 | struct sock *sk = sock->sk; | |
364 | ||
365 | BT_DBG("sock %p, sk %p", sock, sk); | |
366 | ||
367 | addr->sa_family = AF_BLUETOOTH; | |
368 | *len = sizeof(struct sockaddr_l2); | |
369 | ||
370 | if (peer) { | |
371 | la->l2_psm = l2cap_pi(sk)->psm; | |
372 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); | |
373 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
374 | } else { | |
375 | la->l2_psm = l2cap_pi(sk)->sport; | |
376 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); | |
377 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); | |
378 | } | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
384 | { | |
385 | struct sock *sk = sock->sk; | |
386 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
387 | struct l2cap_options opts; | |
388 | struct l2cap_conninfo cinfo; | |
389 | int len, err = 0; | |
390 | u32 opt; | |
391 | ||
392 | BT_DBG("sk %p", sk); | |
393 | ||
394 | if (get_user(len, optlen)) | |
395 | return -EFAULT; | |
396 | ||
397 | lock_sock(sk); | |
398 | ||
399 | switch (optname) { | |
400 | case L2CAP_OPTIONS: | |
401 | memset(&opts, 0, sizeof(opts)); | |
402 | opts.imtu = l2cap_pi(sk)->imtu; | |
403 | opts.omtu = l2cap_pi(sk)->omtu; | |
404 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
405 | opts.mode = l2cap_pi(sk)->mode; | |
406 | opts.fcs = l2cap_pi(sk)->fcs; | |
407 | opts.max_tx = l2cap_pi(sk)->max_tx; | |
408 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; | |
409 | ||
410 | len = min_t(unsigned int, len, sizeof(opts)); | |
411 | if (copy_to_user(optval, (char *) &opts, len)) | |
412 | err = -EFAULT; | |
413 | ||
414 | break; | |
415 | ||
416 | case L2CAP_LM: | |
417 | switch (chan->sec_level) { | |
418 | case BT_SECURITY_LOW: | |
419 | opt = L2CAP_LM_AUTH; | |
420 | break; | |
421 | case BT_SECURITY_MEDIUM: | |
422 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; | |
423 | break; | |
424 | case BT_SECURITY_HIGH: | |
425 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | | |
426 | L2CAP_LM_SECURE; | |
427 | break; | |
428 | default: | |
429 | opt = 0; | |
430 | break; | |
431 | } | |
432 | ||
433 | if (chan->role_switch) | |
434 | opt |= L2CAP_LM_MASTER; | |
435 | ||
436 | if (chan->force_reliable) | |
437 | opt |= L2CAP_LM_RELIABLE; | |
438 | ||
439 | if (put_user(opt, (u32 __user *) optval)) | |
440 | err = -EFAULT; | |
441 | break; | |
442 | ||
443 | case L2CAP_CONNINFO: | |
444 | if (sk->sk_state != BT_CONNECTED && | |
445 | !(sk->sk_state == BT_CONNECT2 && | |
446 | bt_sk(sk)->defer_setup)) { | |
447 | err = -ENOTCONN; | |
448 | break; | |
449 | } | |
450 | ||
451 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
452 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
453 | ||
454 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
455 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
456 | err = -EFAULT; | |
457 | ||
458 | break; | |
459 | ||
460 | default: | |
461 | err = -ENOPROTOOPT; | |
462 | break; | |
463 | } | |
464 | ||
465 | release_sock(sk); | |
466 | return err; | |
467 | } | |
468 | ||
469 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) | |
470 | { | |
471 | struct sock *sk = sock->sk; | |
472 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
473 | struct bt_security sec; | |
474 | int len, err = 0; | |
475 | ||
476 | BT_DBG("sk %p", sk); | |
477 | ||
478 | if (level == SOL_L2CAP) | |
479 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); | |
480 | ||
481 | if (level != SOL_BLUETOOTH) | |
482 | return -ENOPROTOOPT; | |
483 | ||
484 | if (get_user(len, optlen)) | |
485 | return -EFAULT; | |
486 | ||
487 | lock_sock(sk); | |
488 | ||
489 | switch (optname) { | |
490 | case BT_SECURITY: | |
491 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM | |
492 | && sk->sk_type != SOCK_RAW) { | |
493 | err = -EINVAL; | |
494 | break; | |
495 | } | |
496 | ||
497 | sec.level = chan->sec_level; | |
498 | ||
499 | len = min_t(unsigned int, len, sizeof(sec)); | |
500 | if (copy_to_user(optval, (char *) &sec, len)) | |
501 | err = -EFAULT; | |
502 | ||
503 | break; | |
504 | ||
505 | case BT_DEFER_SETUP: | |
506 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
507 | err = -EINVAL; | |
508 | break; | |
509 | } | |
510 | ||
511 | if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) | |
512 | err = -EFAULT; | |
513 | ||
514 | break; | |
515 | ||
516 | case BT_FLUSHABLE: | |
517 | if (put_user(chan->flushable, (u32 __user *) optval)) | |
518 | err = -EFAULT; | |
519 | ||
520 | break; | |
521 | ||
522 | default: | |
523 | err = -ENOPROTOOPT; | |
524 | break; | |
525 | } | |
526 | ||
527 | release_sock(sk); | |
528 | return err; | |
529 | } | |
530 | ||
531 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) | |
532 | { | |
533 | struct sock *sk = sock->sk; | |
534 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
535 | struct l2cap_options opts; | |
536 | int len, err = 0; | |
537 | u32 opt; | |
538 | ||
539 | BT_DBG("sk %p", sk); | |
540 | ||
541 | lock_sock(sk); | |
542 | ||
543 | switch (optname) { | |
544 | case L2CAP_OPTIONS: | |
545 | if (sk->sk_state == BT_CONNECTED) { | |
546 | err = -EINVAL; | |
547 | break; | |
548 | } | |
549 | ||
550 | opts.imtu = l2cap_pi(sk)->imtu; | |
551 | opts.omtu = l2cap_pi(sk)->omtu; | |
552 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
553 | opts.mode = l2cap_pi(sk)->mode; | |
554 | opts.fcs = l2cap_pi(sk)->fcs; | |
555 | opts.max_tx = l2cap_pi(sk)->max_tx; | |
556 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; | |
557 | ||
558 | len = min_t(unsigned int, sizeof(opts), optlen); | |
559 | if (copy_from_user((char *) &opts, optval, len)) { | |
560 | err = -EFAULT; | |
561 | break; | |
562 | } | |
563 | ||
564 | if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) { | |
565 | err = -EINVAL; | |
566 | break; | |
567 | } | |
568 | ||
569 | l2cap_pi(sk)->mode = opts.mode; | |
570 | switch (l2cap_pi(sk)->mode) { | |
571 | case L2CAP_MODE_BASIC: | |
572 | chan->conf_state &= ~L2CAP_CONF_STATE2_DEVICE; | |
573 | break; | |
574 | case L2CAP_MODE_ERTM: | |
575 | case L2CAP_MODE_STREAMING: | |
576 | if (!disable_ertm) | |
577 | break; | |
578 | /* fall through */ | |
579 | default: | |
580 | err = -EINVAL; | |
581 | break; | |
582 | } | |
583 | ||
584 | l2cap_pi(sk)->imtu = opts.imtu; | |
585 | l2cap_pi(sk)->omtu = opts.omtu; | |
586 | l2cap_pi(sk)->fcs = opts.fcs; | |
587 | l2cap_pi(sk)->max_tx = opts.max_tx; | |
588 | l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; | |
589 | break; | |
590 | ||
591 | case L2CAP_LM: | |
592 | if (get_user(opt, (u32 __user *) optval)) { | |
593 | err = -EFAULT; | |
594 | break; | |
595 | } | |
596 | ||
597 | if (opt & L2CAP_LM_AUTH) | |
598 | chan->sec_level = BT_SECURITY_LOW; | |
599 | if (opt & L2CAP_LM_ENCRYPT) | |
600 | chan->sec_level = BT_SECURITY_MEDIUM; | |
601 | if (opt & L2CAP_LM_SECURE) | |
602 | chan->sec_level = BT_SECURITY_HIGH; | |
603 | ||
604 | chan->role_switch = (opt & L2CAP_LM_MASTER); | |
605 | chan->force_reliable = (opt & L2CAP_LM_RELIABLE); | |
606 | break; | |
607 | ||
608 | default: | |
609 | err = -ENOPROTOOPT; | |
610 | break; | |
611 | } | |
612 | ||
613 | release_sock(sk); | |
614 | return err; | |
615 | } | |
616 | ||
617 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) | |
618 | { | |
619 | struct sock *sk = sock->sk; | |
620 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
621 | struct bt_security sec; | |
622 | int len, err = 0; | |
623 | u32 opt; | |
624 | ||
625 | BT_DBG("sk %p", sk); | |
626 | ||
627 | if (level == SOL_L2CAP) | |
628 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); | |
629 | ||
630 | if (level != SOL_BLUETOOTH) | |
631 | return -ENOPROTOOPT; | |
632 | ||
633 | lock_sock(sk); | |
634 | ||
635 | switch (optname) { | |
636 | case BT_SECURITY: | |
637 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM | |
638 | && sk->sk_type != SOCK_RAW) { | |
639 | err = -EINVAL; | |
640 | break; | |
641 | } | |
642 | ||
643 | sec.level = BT_SECURITY_LOW; | |
644 | ||
645 | len = min_t(unsigned int, sizeof(sec), optlen); | |
646 | if (copy_from_user((char *) &sec, optval, len)) { | |
647 | err = -EFAULT; | |
648 | break; | |
649 | } | |
650 | ||
651 | if (sec.level < BT_SECURITY_LOW || | |
652 | sec.level > BT_SECURITY_HIGH) { | |
653 | err = -EINVAL; | |
654 | break; | |
655 | } | |
656 | ||
657 | chan->sec_level = sec.level; | |
658 | break; | |
659 | ||
660 | case BT_DEFER_SETUP: | |
661 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
662 | err = -EINVAL; | |
663 | break; | |
664 | } | |
665 | ||
666 | if (get_user(opt, (u32 __user *) optval)) { | |
667 | err = -EFAULT; | |
668 | break; | |
669 | } | |
670 | ||
671 | bt_sk(sk)->defer_setup = opt; | |
672 | break; | |
673 | ||
674 | case BT_FLUSHABLE: | |
675 | if (get_user(opt, (u32 __user *) optval)) { | |
676 | err = -EFAULT; | |
677 | break; | |
678 | } | |
679 | ||
680 | if (opt > BT_FLUSHABLE_ON) { | |
681 | err = -EINVAL; | |
682 | break; | |
683 | } | |
684 | ||
685 | if (opt == BT_FLUSHABLE_OFF) { | |
686 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
687 | /* proceed futher only when we have l2cap_conn and | |
688 | No Flush support in the LM */ | |
689 | if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) { | |
690 | err = -EINVAL; | |
691 | break; | |
692 | } | |
693 | } | |
694 | ||
695 | chan->flushable = opt; | |
696 | break; | |
697 | ||
698 | default: | |
699 | err = -ENOPROTOOPT; | |
700 | break; | |
701 | } | |
702 | ||
703 | release_sock(sk); | |
704 | return err; | |
705 | } | |
706 | ||
707 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) | |
708 | { | |
709 | struct sock *sk = sock->sk; | |
710 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
711 | struct sk_buff *skb; | |
712 | u16 control; | |
713 | int err; | |
714 | ||
715 | BT_DBG("sock %p, sk %p", sock, sk); | |
716 | ||
717 | err = sock_error(sk); | |
718 | if (err) | |
719 | return err; | |
720 | ||
721 | if (msg->msg_flags & MSG_OOB) | |
722 | return -EOPNOTSUPP; | |
723 | ||
724 | lock_sock(sk); | |
725 | ||
726 | if (sk->sk_state != BT_CONNECTED) { | |
727 | err = -ENOTCONN; | |
728 | goto done; | |
729 | } | |
730 | ||
731 | /* Connectionless channel */ | |
732 | if (sk->sk_type == SOCK_DGRAM) { | |
733 | skb = l2cap_create_connless_pdu(sk, msg, len); | |
734 | if (IS_ERR(skb)) { | |
735 | err = PTR_ERR(skb); | |
736 | } else { | |
737 | l2cap_do_send(pi->chan, skb); | |
738 | err = len; | |
739 | } | |
740 | goto done; | |
741 | } | |
742 | ||
743 | switch (pi->mode) { | |
744 | case L2CAP_MODE_BASIC: | |
745 | /* Check outgoing MTU */ | |
746 | if (len > pi->omtu) { | |
747 | err = -EMSGSIZE; | |
748 | goto done; | |
749 | } | |
750 | ||
751 | /* Create a basic PDU */ | |
752 | skb = l2cap_create_basic_pdu(sk, msg, len); | |
753 | if (IS_ERR(skb)) { | |
754 | err = PTR_ERR(skb); | |
755 | goto done; | |
756 | } | |
757 | ||
758 | l2cap_do_send(pi->chan, skb); | |
759 | err = len; | |
760 | break; | |
761 | ||
762 | case L2CAP_MODE_ERTM: | |
763 | case L2CAP_MODE_STREAMING: | |
764 | /* Entire SDU fits into one PDU */ | |
765 | if (len <= pi->chan->remote_mps) { | |
766 | control = L2CAP_SDU_UNSEGMENTED; | |
767 | skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); | |
768 | if (IS_ERR(skb)) { | |
769 | err = PTR_ERR(skb); | |
770 | goto done; | |
771 | } | |
772 | __skb_queue_tail(&pi->chan->tx_q, skb); | |
773 | ||
774 | if (pi->chan->tx_send_head == NULL) | |
775 | pi->chan->tx_send_head = skb; | |
776 | ||
777 | } else { | |
778 | /* Segment SDU into multiples PDUs */ | |
779 | err = l2cap_sar_segment_sdu(pi->chan, msg, len); | |
780 | if (err < 0) | |
781 | goto done; | |
782 | } | |
783 | ||
784 | if (pi->mode == L2CAP_MODE_STREAMING) { | |
785 | l2cap_streaming_send(pi->chan); | |
786 | err = len; | |
787 | break; | |
788 | } | |
789 | ||
790 | if ((pi->chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
791 | (pi->chan->conn_state & L2CAP_CONN_WAIT_F)) { | |
792 | err = len; | |
793 | break; | |
794 | } | |
795 | err = l2cap_ertm_send(pi->chan); | |
796 | ||
797 | if (err >= 0) | |
798 | err = len; | |
799 | break; | |
800 | ||
801 | default: | |
802 | BT_DBG("bad state %1.1x", pi->mode); | |
803 | err = -EBADFD; | |
804 | } | |
805 | ||
806 | done: | |
807 | release_sock(sk); | |
808 | return err; | |
809 | } | |
810 | ||
811 | static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) | |
812 | { | |
813 | struct sock *sk = sock->sk; | |
814 | ||
815 | lock_sock(sk); | |
816 | ||
817 | if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { | |
818 | __l2cap_connect_rsp_defer(sk); | |
819 | release_sock(sk); | |
820 | return 0; | |
821 | } | |
822 | ||
823 | release_sock(sk); | |
824 | ||
825 | if (sock->type == SOCK_STREAM) | |
826 | return bt_sock_stream_recvmsg(iocb, sock, msg, len, flags); | |
827 | ||
828 | return bt_sock_recvmsg(iocb, sock, msg, len, flags); | |
829 | } | |
830 | ||
831 | /* Kill socket (only if zapped and orphan) | |
832 | * Must be called on unlocked socket. | |
833 | */ | |
834 | void l2cap_sock_kill(struct sock *sk) | |
835 | { | |
836 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
837 | return; | |
838 | ||
839 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
840 | ||
841 | /* Kill poor orphan */ | |
842 | bt_sock_unlink(&l2cap_sk_list, sk); | |
843 | sock_set_flag(sk, SOCK_DEAD); | |
844 | sock_put(sk); | |
845 | } | |
846 | ||
847 | /* Must be called on unlocked socket. */ | |
848 | static void l2cap_sock_close(struct sock *sk) | |
849 | { | |
850 | l2cap_sock_clear_timer(sk); | |
851 | lock_sock(sk); | |
852 | __l2cap_sock_close(sk, ECONNRESET); | |
853 | release_sock(sk); | |
854 | l2cap_sock_kill(sk); | |
855 | } | |
856 | ||
857 | static void l2cap_sock_cleanup_listen(struct sock *parent) | |
858 | { | |
859 | struct sock *sk; | |
860 | ||
861 | BT_DBG("parent %p", parent); | |
862 | ||
863 | /* Close not yet accepted channels */ | |
864 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
865 | l2cap_sock_close(sk); | |
866 | ||
867 | parent->sk_state = BT_CLOSED; | |
868 | sock_set_flag(parent, SOCK_ZAPPED); | |
869 | } | |
870 | ||
871 | void __l2cap_sock_close(struct sock *sk, int reason) | |
872 | { | |
873 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
874 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
875 | ||
876 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
877 | ||
878 | switch (sk->sk_state) { | |
879 | case BT_LISTEN: | |
880 | l2cap_sock_cleanup_listen(sk); | |
881 | break; | |
882 | ||
883 | case BT_CONNECTED: | |
884 | case BT_CONFIG: | |
885 | if ((sk->sk_type == SOCK_SEQPACKET || | |
886 | sk->sk_type == SOCK_STREAM) && | |
887 | conn->hcon->type == ACL_LINK) { | |
888 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
889 | l2cap_send_disconn_req(conn, chan, reason); | |
890 | } else | |
891 | l2cap_chan_del(chan, reason); | |
892 | break; | |
893 | ||
894 | case BT_CONNECT2: | |
895 | if ((sk->sk_type == SOCK_SEQPACKET || | |
896 | sk->sk_type == SOCK_STREAM) && | |
897 | conn->hcon->type == ACL_LINK) { | |
898 | struct l2cap_conn_rsp rsp; | |
899 | __u16 result; | |
900 | ||
901 | if (bt_sk(sk)->defer_setup) | |
902 | result = L2CAP_CR_SEC_BLOCK; | |
903 | else | |
904 | result = L2CAP_CR_BAD_PSM; | |
905 | ||
906 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
907 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
908 | rsp.result = cpu_to_le16(result); | |
909 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
910 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
911 | sizeof(rsp), &rsp); | |
912 | } | |
913 | ||
914 | l2cap_chan_del(chan, reason); | |
915 | break; | |
916 | ||
917 | case BT_CONNECT: | |
918 | case BT_DISCONN: | |
919 | l2cap_chan_del(chan, reason); | |
920 | break; | |
921 | ||
922 | default: | |
923 | sock_set_flag(sk, SOCK_ZAPPED); | |
924 | break; | |
925 | } | |
926 | } | |
927 | ||
928 | static int l2cap_sock_shutdown(struct socket *sock, int how) | |
929 | { | |
930 | struct sock *sk = sock->sk; | |
931 | int err = 0; | |
932 | ||
933 | BT_DBG("sock %p, sk %p", sock, sk); | |
934 | ||
935 | if (!sk) | |
936 | return 0; | |
937 | ||
938 | lock_sock(sk); | |
939 | if (!sk->sk_shutdown) { | |
940 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) | |
941 | err = __l2cap_wait_ack(sk); | |
942 | ||
943 | sk->sk_shutdown = SHUTDOWN_MASK; | |
944 | l2cap_sock_clear_timer(sk); | |
945 | __l2cap_sock_close(sk, 0); | |
946 | ||
947 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
948 | err = bt_sock_wait_state(sk, BT_CLOSED, | |
949 | sk->sk_lingertime); | |
950 | } | |
951 | ||
952 | if (!err && sk->sk_err) | |
953 | err = -sk->sk_err; | |
954 | ||
955 | release_sock(sk); | |
956 | return err; | |
957 | } | |
958 | ||
959 | static int l2cap_sock_release(struct socket *sock) | |
960 | { | |
961 | struct sock *sk = sock->sk; | |
962 | int err; | |
963 | ||
964 | BT_DBG("sock %p, sk %p", sock, sk); | |
965 | ||
966 | if (!sk) | |
967 | return 0; | |
968 | ||
969 | err = l2cap_sock_shutdown(sock, 2); | |
970 | ||
971 | sock_orphan(sk); | |
972 | l2cap_sock_kill(sk); | |
973 | return err; | |
974 | } | |
975 | ||
976 | static void l2cap_sock_destruct(struct sock *sk) | |
977 | { | |
978 | BT_DBG("sk %p", sk); | |
979 | ||
980 | skb_queue_purge(&sk->sk_receive_queue); | |
981 | skb_queue_purge(&sk->sk_write_queue); | |
982 | } | |
983 | ||
984 | void l2cap_sock_init(struct sock *sk, struct sock *parent) | |
985 | { | |
986 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
987 | struct l2cap_chan *chan = pi->chan; | |
988 | ||
989 | BT_DBG("sk %p", sk); | |
990 | ||
991 | if (parent) { | |
992 | struct l2cap_chan *pchan = l2cap_pi(parent)->chan; | |
993 | ||
994 | sk->sk_type = parent->sk_type; | |
995 | bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; | |
996 | ||
997 | pi->imtu = l2cap_pi(parent)->imtu; | |
998 | pi->omtu = l2cap_pi(parent)->omtu; | |
999 | chan->conf_state = pchan->conf_state; | |
1000 | pi->mode = l2cap_pi(parent)->mode; | |
1001 | pi->fcs = l2cap_pi(parent)->fcs; | |
1002 | pi->max_tx = l2cap_pi(parent)->max_tx; | |
1003 | pi->tx_win = l2cap_pi(parent)->tx_win; | |
1004 | chan->sec_level = pchan->sec_level; | |
1005 | chan->role_switch = pchan->role_switch; | |
1006 | chan->force_reliable = pchan->force_reliable; | |
1007 | chan->flushable = pchan->flushable; | |
1008 | } else { | |
1009 | pi->imtu = L2CAP_DEFAULT_MTU; | |
1010 | pi->omtu = 0; | |
1011 | if (!disable_ertm && sk->sk_type == SOCK_STREAM) { | |
1012 | pi->mode = L2CAP_MODE_ERTM; | |
1013 | chan->conf_state |= L2CAP_CONF_STATE2_DEVICE; | |
1014 | } else { | |
1015 | pi->mode = L2CAP_MODE_BASIC; | |
1016 | } | |
1017 | pi->max_tx = L2CAP_DEFAULT_MAX_TX; | |
1018 | pi->fcs = L2CAP_FCS_CRC16; | |
1019 | pi->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
1020 | chan->sec_level = BT_SECURITY_LOW; | |
1021 | chan->role_switch = 0; | |
1022 | chan->force_reliable = 0; | |
1023 | chan->flushable = BT_FLUSHABLE_OFF; | |
1024 | } | |
1025 | ||
1026 | /* Default config options */ | |
1027 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
1028 | } | |
1029 | ||
1030 | static struct proto l2cap_proto = { | |
1031 | .name = "L2CAP", | |
1032 | .owner = THIS_MODULE, | |
1033 | .obj_size = sizeof(struct l2cap_pinfo) | |
1034 | }; | |
1035 | ||
1036 | struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) | |
1037 | { | |
1038 | struct sock *sk; | |
1039 | ||
1040 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); | |
1041 | if (!sk) | |
1042 | return NULL; | |
1043 | ||
1044 | sock_init_data(sock, sk); | |
1045 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
1046 | ||
1047 | sk->sk_destruct = l2cap_sock_destruct; | |
1048 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); | |
1049 | ||
1050 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1051 | ||
1052 | sk->sk_protocol = proto; | |
1053 | sk->sk_state = BT_OPEN; | |
1054 | ||
1055 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); | |
1056 | ||
1057 | bt_sock_link(&l2cap_sk_list, sk); | |
1058 | return sk; | |
1059 | } | |
1060 | ||
1061 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, | |
1062 | int kern) | |
1063 | { | |
1064 | struct sock *sk; | |
1065 | struct l2cap_chan *chan; | |
1066 | ||
1067 | BT_DBG("sock %p", sock); | |
1068 | ||
1069 | sock->state = SS_UNCONNECTED; | |
1070 | ||
1071 | if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && | |
1072 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) | |
1073 | return -ESOCKTNOSUPPORT; | |
1074 | ||
1075 | if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) | |
1076 | return -EPERM; | |
1077 | ||
1078 | sock->ops = &l2cap_sock_ops; | |
1079 | ||
1080 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); | |
1081 | if (!sk) | |
1082 | return -ENOMEM; | |
1083 | ||
1084 | chan = l2cap_chan_alloc(sk); | |
1085 | if (!chan) { | |
1086 | l2cap_sock_kill(sk); | |
1087 | return -ENOMEM; | |
1088 | } | |
1089 | ||
1090 | l2cap_pi(sk)->chan = chan; | |
1091 | ||
1092 | l2cap_sock_init(sk, NULL); | |
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | const struct proto_ops l2cap_sock_ops = { | |
1097 | .family = PF_BLUETOOTH, | |
1098 | .owner = THIS_MODULE, | |
1099 | .release = l2cap_sock_release, | |
1100 | .bind = l2cap_sock_bind, | |
1101 | .connect = l2cap_sock_connect, | |
1102 | .listen = l2cap_sock_listen, | |
1103 | .accept = l2cap_sock_accept, | |
1104 | .getname = l2cap_sock_getname, | |
1105 | .sendmsg = l2cap_sock_sendmsg, | |
1106 | .recvmsg = l2cap_sock_recvmsg, | |
1107 | .poll = bt_sock_poll, | |
1108 | .ioctl = bt_sock_ioctl, | |
1109 | .mmap = sock_no_mmap, | |
1110 | .socketpair = sock_no_socketpair, | |
1111 | .shutdown = l2cap_sock_shutdown, | |
1112 | .setsockopt = l2cap_sock_setsockopt, | |
1113 | .getsockopt = l2cap_sock_getsockopt | |
1114 | }; | |
1115 | ||
1116 | static const struct net_proto_family l2cap_sock_family_ops = { | |
1117 | .family = PF_BLUETOOTH, | |
1118 | .owner = THIS_MODULE, | |
1119 | .create = l2cap_sock_create, | |
1120 | }; | |
1121 | ||
1122 | int __init l2cap_init_sockets(void) | |
1123 | { | |
1124 | int err; | |
1125 | ||
1126 | err = proto_register(&l2cap_proto, 0); | |
1127 | if (err < 0) | |
1128 | return err; | |
1129 | ||
1130 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); | |
1131 | if (err < 0) | |
1132 | goto error; | |
1133 | ||
1134 | BT_INFO("L2CAP socket layer initialized"); | |
1135 | ||
1136 | return 0; | |
1137 | ||
1138 | error: | |
1139 | BT_ERR("L2CAP socket registration failed"); | |
1140 | proto_unregister(&l2cap_proto); | |
1141 | return err; | |
1142 | } | |
1143 | ||
1144 | void l2cap_cleanup_sockets(void) | |
1145 | { | |
1146 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) | |
1147 | BT_ERR("L2CAP socket unregistration failed"); | |
1148 | ||
1149 | proto_unregister(&l2cap_proto); | |
1150 | } |