Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | RFCOMM implementation for Linux Bluetooth stack (BlueZ). |
3 | Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org> | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License version 2 as | |
8 | published by the Free Software Foundation; | |
9 | ||
10 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
11 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
12 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
13 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
14 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
15 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
17 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
18 | ||
8e87d142 YH |
19 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
20 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
21 | SOFTWARE IS DISCLAIMED. |
22 | */ | |
23 | ||
24 | /* | |
25 | * RFCOMM sockets. | |
1da177e4 LT |
26 | */ |
27 | ||
8c520a59 | 28 | #include <linux/export.h> |
aef7d97c | 29 | #include <linux/debugfs.h> |
1da177e4 LT |
30 | |
31 | #include <net/bluetooth/bluetooth.h> | |
32 | #include <net/bluetooth/hci_core.h> | |
33 | #include <net/bluetooth/l2cap.h> | |
34 | #include <net/bluetooth/rfcomm.h> | |
35 | ||
90ddc4f0 | 36 | static const struct proto_ops rfcomm_sock_ops; |
1da177e4 LT |
37 | |
38 | static struct bt_sock_list rfcomm_sk_list = { | |
d5fb2962 | 39 | .lock = __RW_LOCK_UNLOCKED(rfcomm_sk_list.lock) |
1da177e4 LT |
40 | }; |
41 | ||
42 | static void rfcomm_sock_close(struct sock *sk); | |
43 | static void rfcomm_sock_kill(struct sock *sk); | |
44 | ||
45 | /* ---- DLC callbacks ---- | |
46 | * | |
47 | * called under rfcomm_dlc_lock() | |
48 | */ | |
49 | static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb) | |
50 | { | |
51 | struct sock *sk = d->owner; | |
52 | if (!sk) | |
53 | return; | |
54 | ||
55 | atomic_add(skb->len, &sk->sk_rmem_alloc); | |
56 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
57 | sk->sk_data_ready(sk, skb->len); | |
58 | ||
59 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) | |
60 | rfcomm_dlc_throttle(d); | |
61 | } | |
62 | ||
63 | static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err) | |
64 | { | |
65 | struct sock *sk = d->owner, *parent; | |
fad003b6 GP |
66 | unsigned long flags; |
67 | ||
1da177e4 LT |
68 | if (!sk) |
69 | return; | |
70 | ||
71 | BT_DBG("dlc %p state %ld err %d", d, d->state, err); | |
72 | ||
fad003b6 | 73 | local_irq_save(flags); |
1da177e4 LT |
74 | bh_lock_sock(sk); |
75 | ||
76 | if (err) | |
77 | sk->sk_err = err; | |
78 | ||
79 | sk->sk_state = d->state; | |
80 | ||
81 | parent = bt_sk(sk)->parent; | |
82 | if (parent) { | |
83 | if (d->state == BT_CLOSED) { | |
84 | sock_set_flag(sk, SOCK_ZAPPED); | |
85 | bt_accept_unlink(sk); | |
86 | } | |
87 | parent->sk_data_ready(parent, 0); | |
88 | } else { | |
89 | if (d->state == BT_CONNECTED) | |
90 | rfcomm_session_getaddr(d->session, &bt_sk(sk)->src, NULL); | |
91 | sk->sk_state_change(sk); | |
92 | } | |
93 | ||
94 | bh_unlock_sock(sk); | |
fad003b6 | 95 | local_irq_restore(flags); |
1da177e4 LT |
96 | |
97 | if (parent && sock_flag(sk, SOCK_ZAPPED)) { | |
98 | /* We have to drop DLC lock here, otherwise | |
99 | * rfcomm_sock_destruct() will dead lock. */ | |
100 | rfcomm_dlc_unlock(d); | |
101 | rfcomm_sock_kill(sk); | |
102 | rfcomm_dlc_lock(d); | |
103 | } | |
104 | } | |
105 | ||
106 | /* ---- Socket functions ---- */ | |
107 | static struct sock *__rfcomm_get_sock_by_addr(u8 channel, bdaddr_t *src) | |
108 | { | |
109 | struct sock *sk = NULL; | |
110 | struct hlist_node *node; | |
111 | ||
112 | sk_for_each(sk, node, &rfcomm_sk_list.head) { | |
8e87d142 | 113 | if (rfcomm_pi(sk)->channel == channel && |
1da177e4 LT |
114 | !bacmp(&bt_sk(sk)->src, src)) |
115 | break; | |
116 | } | |
117 | ||
118 | return node ? sk : NULL; | |
119 | } | |
120 | ||
121 | /* Find socket with channel and source bdaddr. | |
122 | * Returns closest match. | |
123 | */ | |
eeb36656 | 124 | static struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src) |
1da177e4 LT |
125 | { |
126 | struct sock *sk = NULL, *sk1 = NULL; | |
127 | struct hlist_node *node; | |
128 | ||
eeb36656 GP |
129 | read_lock(&rfcomm_sk_list.lock); |
130 | ||
1da177e4 LT |
131 | sk_for_each(sk, node, &rfcomm_sk_list.head) { |
132 | if (state && sk->sk_state != state) | |
133 | continue; | |
134 | ||
135 | if (rfcomm_pi(sk)->channel == channel) { | |
136 | /* Exact match. */ | |
137 | if (!bacmp(&bt_sk(sk)->src, src)) | |
138 | break; | |
139 | ||
140 | /* Closest match */ | |
141 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
142 | sk1 = sk; | |
143 | } | |
144 | } | |
1da177e4 | 145 | |
1da177e4 | 146 | read_unlock(&rfcomm_sk_list.lock); |
eeb36656 GP |
147 | |
148 | return node ? sk : sk1; | |
1da177e4 LT |
149 | } |
150 | ||
151 | static void rfcomm_sock_destruct(struct sock *sk) | |
152 | { | |
153 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
154 | ||
155 | BT_DBG("sk %p dlc %p", sk, d); | |
156 | ||
157 | skb_queue_purge(&sk->sk_receive_queue); | |
158 | skb_queue_purge(&sk->sk_write_queue); | |
159 | ||
160 | rfcomm_dlc_lock(d); | |
161 | rfcomm_pi(sk)->dlc = NULL; | |
162 | ||
163 | /* Detach DLC if it's owned by this socket */ | |
164 | if (d->owner == sk) | |
165 | d->owner = NULL; | |
166 | rfcomm_dlc_unlock(d); | |
167 | ||
168 | rfcomm_dlc_put(d); | |
169 | } | |
170 | ||
171 | static void rfcomm_sock_cleanup_listen(struct sock *parent) | |
172 | { | |
173 | struct sock *sk; | |
174 | ||
175 | BT_DBG("parent %p", parent); | |
176 | ||
177 | /* Close not yet accepted dlcs */ | |
178 | while ((sk = bt_accept_dequeue(parent, NULL))) { | |
179 | rfcomm_sock_close(sk); | |
180 | rfcomm_sock_kill(sk); | |
181 | } | |
182 | ||
183 | parent->sk_state = BT_CLOSED; | |
184 | sock_set_flag(parent, SOCK_ZAPPED); | |
185 | } | |
186 | ||
187 | /* Kill socket (only if zapped and orphan) | |
188 | * Must be called on unlocked socket. | |
189 | */ | |
190 | static void rfcomm_sock_kill(struct sock *sk) | |
191 | { | |
192 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
193 | return; | |
194 | ||
195 | BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
196 | ||
197 | /* Kill poor orphan */ | |
198 | bt_sock_unlink(&rfcomm_sk_list, sk); | |
199 | sock_set_flag(sk, SOCK_DEAD); | |
200 | sock_put(sk); | |
201 | } | |
202 | ||
203 | static void __rfcomm_sock_close(struct sock *sk) | |
204 | { | |
205 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
206 | ||
207 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
208 | ||
209 | switch (sk->sk_state) { | |
210 | case BT_LISTEN: | |
211 | rfcomm_sock_cleanup_listen(sk); | |
212 | break; | |
213 | ||
214 | case BT_CONNECT: | |
215 | case BT_CONNECT2: | |
216 | case BT_CONFIG: | |
217 | case BT_CONNECTED: | |
218 | rfcomm_dlc_close(d, 0); | |
219 | ||
220 | default: | |
221 | sock_set_flag(sk, SOCK_ZAPPED); | |
222 | break; | |
223 | } | |
224 | } | |
225 | ||
226 | /* Close socket. | |
227 | * Must be called on unlocked socket. | |
228 | */ | |
229 | static void rfcomm_sock_close(struct sock *sk) | |
230 | { | |
231 | lock_sock(sk); | |
232 | __rfcomm_sock_close(sk); | |
233 | release_sock(sk); | |
234 | } | |
235 | ||
236 | static void rfcomm_sock_init(struct sock *sk, struct sock *parent) | |
237 | { | |
238 | struct rfcomm_pinfo *pi = rfcomm_pi(sk); | |
239 | ||
240 | BT_DBG("sk %p", sk); | |
241 | ||
242 | if (parent) { | |
243 | sk->sk_type = parent->sk_type; | |
c5daa683 GP |
244 | pi->dlc->defer_setup = test_bit(BT_SK_DEFER_SETUP, |
245 | &bt_sk(parent)->flags); | |
9f2c8a03 MH |
246 | |
247 | pi->sec_level = rfcomm_pi(parent)->sec_level; | |
248 | pi->role_switch = rfcomm_pi(parent)->role_switch; | |
6230c9b4 PM |
249 | |
250 | security_sk_clone(parent, sk); | |
1da177e4 | 251 | } else { |
bb23c0ab | 252 | pi->dlc->defer_setup = 0; |
9f2c8a03 MH |
253 | |
254 | pi->sec_level = BT_SECURITY_LOW; | |
255 | pi->role_switch = 0; | |
1da177e4 LT |
256 | } |
257 | ||
9f2c8a03 MH |
258 | pi->dlc->sec_level = pi->sec_level; |
259 | pi->dlc->role_switch = pi->role_switch; | |
1da177e4 LT |
260 | } |
261 | ||
262 | static struct proto rfcomm_proto = { | |
263 | .name = "RFCOMM", | |
264 | .owner = THIS_MODULE, | |
265 | .obj_size = sizeof(struct rfcomm_pinfo) | |
266 | }; | |
267 | ||
1b8d7ae4 | 268 | static struct sock *rfcomm_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
269 | { |
270 | struct rfcomm_dlc *d; | |
271 | struct sock *sk; | |
272 | ||
6257ff21 | 273 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &rfcomm_proto); |
1da177e4 LT |
274 | if (!sk) |
275 | return NULL; | |
276 | ||
277 | sock_init_data(sock, sk); | |
278 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
279 | ||
280 | d = rfcomm_dlc_alloc(prio); | |
281 | if (!d) { | |
282 | sk_free(sk); | |
283 | return NULL; | |
284 | } | |
285 | ||
286 | d->data_ready = rfcomm_sk_data_ready; | |
287 | d->state_change = rfcomm_sk_state_change; | |
288 | ||
289 | rfcomm_pi(sk)->dlc = d; | |
290 | d->owner = sk; | |
291 | ||
292 | sk->sk_destruct = rfcomm_sock_destruct; | |
293 | sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT; | |
294 | ||
77db1980 MH |
295 | sk->sk_sndbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10; |
296 | sk->sk_rcvbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10; | |
1da177e4 LT |
297 | |
298 | sock_reset_flag(sk, SOCK_ZAPPED); | |
299 | ||
300 | sk->sk_protocol = proto; | |
77db1980 | 301 | sk->sk_state = BT_OPEN; |
1da177e4 LT |
302 | |
303 | bt_sock_link(&rfcomm_sk_list, sk); | |
304 | ||
305 | BT_DBG("sk %p", sk); | |
306 | return sk; | |
307 | } | |
308 | ||
3f378b68 EP |
309 | static int rfcomm_sock_create(struct net *net, struct socket *sock, |
310 | int protocol, int kern) | |
1da177e4 LT |
311 | { |
312 | struct sock *sk; | |
313 | ||
314 | BT_DBG("sock %p", sock); | |
315 | ||
316 | sock->state = SS_UNCONNECTED; | |
317 | ||
318 | if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW) | |
319 | return -ESOCKTNOSUPPORT; | |
320 | ||
321 | sock->ops = &rfcomm_sock_ops; | |
322 | ||
1b8d7ae4 | 323 | sk = rfcomm_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
74da626a | 324 | if (!sk) |
1da177e4 LT |
325 | return -ENOMEM; |
326 | ||
327 | rfcomm_sock_init(sk, NULL); | |
328 | return 0; | |
329 | } | |
330 | ||
331 | static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
332 | { | |
333 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
334 | struct sock *sk = sock->sk; | |
335 | int err = 0; | |
336 | ||
337 | BT_DBG("sk %p %s", sk, batostr(&sa->rc_bdaddr)); | |
338 | ||
339 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
340 | return -EINVAL; | |
341 | ||
342 | lock_sock(sk); | |
343 | ||
344 | if (sk->sk_state != BT_OPEN) { | |
345 | err = -EBADFD; | |
346 | goto done; | |
347 | } | |
348 | ||
354d28d5 MH |
349 | if (sk->sk_type != SOCK_STREAM) { |
350 | err = -EINVAL; | |
351 | goto done; | |
352 | } | |
353 | ||
95ca83f4 | 354 | write_lock(&rfcomm_sk_list.lock); |
1da177e4 LT |
355 | |
356 | if (sa->rc_channel && __rfcomm_get_sock_by_addr(sa->rc_channel, &sa->rc_bdaddr)) { | |
357 | err = -EADDRINUSE; | |
358 | } else { | |
359 | /* Save source address */ | |
360 | bacpy(&bt_sk(sk)->src, &sa->rc_bdaddr); | |
361 | rfcomm_pi(sk)->channel = sa->rc_channel; | |
362 | sk->sk_state = BT_BOUND; | |
363 | } | |
364 | ||
95ca83f4 | 365 | write_unlock(&rfcomm_sk_list.lock); |
1da177e4 LT |
366 | |
367 | done: | |
368 | release_sock(sk); | |
369 | return err; | |
370 | } | |
371 | ||
372 | static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
373 | { | |
374 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
375 | struct sock *sk = sock->sk; | |
376 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
377 | int err = 0; | |
378 | ||
379 | BT_DBG("sk %p", sk); | |
380 | ||
6503d961 CG |
381 | if (alen < sizeof(struct sockaddr_rc) || |
382 | addr->sa_family != AF_BLUETOOTH) | |
1da177e4 LT |
383 | return -EINVAL; |
384 | ||
354d28d5 | 385 | lock_sock(sk); |
1da177e4 | 386 | |
354d28d5 MH |
387 | if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) { |
388 | err = -EBADFD; | |
389 | goto done; | |
390 | } | |
1da177e4 | 391 | |
354d28d5 MH |
392 | if (sk->sk_type != SOCK_STREAM) { |
393 | err = -EINVAL; | |
394 | goto done; | |
395 | } | |
1da177e4 LT |
396 | |
397 | sk->sk_state = BT_CONNECT; | |
398 | bacpy(&bt_sk(sk)->dst, &sa->rc_bdaddr); | |
399 | rfcomm_pi(sk)->channel = sa->rc_channel; | |
400 | ||
9f2c8a03 MH |
401 | d->sec_level = rfcomm_pi(sk)->sec_level; |
402 | d->role_switch = rfcomm_pi(sk)->role_switch; | |
77db1980 | 403 | |
1da177e4 LT |
404 | err = rfcomm_dlc_open(d, &bt_sk(sk)->src, &sa->rc_bdaddr, sa->rc_channel); |
405 | if (!err) | |
406 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
407 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
408 | ||
354d28d5 | 409 | done: |
1da177e4 LT |
410 | release_sock(sk); |
411 | return err; | |
412 | } | |
413 | ||
414 | static int rfcomm_sock_listen(struct socket *sock, int backlog) | |
415 | { | |
416 | struct sock *sk = sock->sk; | |
417 | int err = 0; | |
418 | ||
419 | BT_DBG("sk %p backlog %d", sk, backlog); | |
420 | ||
421 | lock_sock(sk); | |
422 | ||
423 | if (sk->sk_state != BT_BOUND) { | |
424 | err = -EBADFD; | |
425 | goto done; | |
426 | } | |
427 | ||
354d28d5 MH |
428 | if (sk->sk_type != SOCK_STREAM) { |
429 | err = -EINVAL; | |
430 | goto done; | |
431 | } | |
432 | ||
1da177e4 LT |
433 | if (!rfcomm_pi(sk)->channel) { |
434 | bdaddr_t *src = &bt_sk(sk)->src; | |
435 | u8 channel; | |
436 | ||
437 | err = -EINVAL; | |
438 | ||
95ca83f4 | 439 | write_lock(&rfcomm_sk_list.lock); |
1da177e4 LT |
440 | |
441 | for (channel = 1; channel < 31; channel++) | |
442 | if (!__rfcomm_get_sock_by_addr(channel, src)) { | |
443 | rfcomm_pi(sk)->channel = channel; | |
444 | err = 0; | |
445 | break; | |
446 | } | |
447 | ||
95ca83f4 | 448 | write_unlock(&rfcomm_sk_list.lock); |
1da177e4 LT |
449 | |
450 | if (err < 0) | |
451 | goto done; | |
452 | } | |
453 | ||
454 | sk->sk_max_ack_backlog = backlog; | |
455 | sk->sk_ack_backlog = 0; | |
456 | sk->sk_state = BT_LISTEN; | |
457 | ||
458 | done: | |
459 | release_sock(sk); | |
460 | return err; | |
461 | } | |
462 | ||
463 | static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
464 | { | |
465 | DECLARE_WAITQUEUE(wait, current); | |
466 | struct sock *sk = sock->sk, *nsk; | |
467 | long timeo; | |
468 | int err = 0; | |
469 | ||
470 | lock_sock(sk); | |
471 | ||
354d28d5 MH |
472 | if (sk->sk_type != SOCK_STREAM) { |
473 | err = -EINVAL; | |
474 | goto done; | |
475 | } | |
476 | ||
1da177e4 LT |
477 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
478 | ||
479 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
480 | ||
481 | /* Wait for an incoming connection. (wake-one). */ | |
aa395145 | 482 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
950e2d51 | 483 | while (1) { |
1da177e4 | 484 | set_current_state(TASK_INTERRUPTIBLE); |
950e2d51 PH |
485 | |
486 | if (sk->sk_state != BT_LISTEN) { | |
487 | err = -EBADFD; | |
1da177e4 LT |
488 | break; |
489 | } | |
490 | ||
950e2d51 PH |
491 | nsk = bt_accept_dequeue(sk, newsock); |
492 | if (nsk) | |
493 | break; | |
1da177e4 | 494 | |
950e2d51 PH |
495 | if (!timeo) { |
496 | err = -EAGAIN; | |
1da177e4 LT |
497 | break; |
498 | } | |
499 | ||
500 | if (signal_pending(current)) { | |
501 | err = sock_intr_errno(timeo); | |
502 | break; | |
503 | } | |
950e2d51 PH |
504 | |
505 | release_sock(sk); | |
506 | timeo = schedule_timeout(timeo); | |
507 | lock_sock(sk); | |
1da177e4 | 508 | } |
950e2d51 | 509 | __set_current_state(TASK_RUNNING); |
aa395145 | 510 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
511 | |
512 | if (err) | |
513 | goto done; | |
514 | ||
515 | newsock->state = SS_CONNECTED; | |
516 | ||
517 | BT_DBG("new socket %p", nsk); | |
518 | ||
519 | done: | |
520 | release_sock(sk); | |
521 | return err; | |
522 | } | |
523 | ||
524 | static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
525 | { | |
526 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
527 | struct sock *sk = sock->sk; | |
528 | ||
529 | BT_DBG("sock %p, sk %p", sock, sk); | |
530 | ||
531 | sa->rc_family = AF_BLUETOOTH; | |
532 | sa->rc_channel = rfcomm_pi(sk)->channel; | |
533 | if (peer) | |
534 | bacpy(&sa->rc_bdaddr, &bt_sk(sk)->dst); | |
535 | else | |
536 | bacpy(&sa->rc_bdaddr, &bt_sk(sk)->src); | |
537 | ||
538 | *len = sizeof(struct sockaddr_rc); | |
539 | return 0; | |
540 | } | |
541 | ||
542 | static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock, | |
543 | struct msghdr *msg, size_t len) | |
544 | { | |
545 | struct sock *sk = sock->sk; | |
546 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
547 | struct sk_buff *skb; | |
1da177e4 LT |
548 | int sent = 0; |
549 | ||
bb23c0ab MH |
550 | if (test_bit(RFCOMM_DEFER_SETUP, &d->flags)) |
551 | return -ENOTCONN; | |
552 | ||
1da177e4 LT |
553 | if (msg->msg_flags & MSG_OOB) |
554 | return -EOPNOTSUPP; | |
555 | ||
556 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
557 | return -EPIPE; | |
558 | ||
559 | BT_DBG("sock %p, sk %p", sock, sk); | |
560 | ||
561 | lock_sock(sk); | |
562 | ||
563 | while (len) { | |
564 | size_t size = min_t(size_t, len, d->mtu); | |
4d6a2188 | 565 | int err; |
8e87d142 | 566 | |
1da177e4 LT |
567 | skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE, |
568 | msg->msg_flags & MSG_DONTWAIT, &err); | |
91aa35a5 VS |
569 | if (!skb) { |
570 | if (sent == 0) | |
571 | sent = err; | |
1da177e4 | 572 | break; |
91aa35a5 | 573 | } |
1da177e4 LT |
574 | skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE); |
575 | ||
576 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
577 | if (err) { | |
578 | kfree_skb(skb); | |
4d6a2188 MH |
579 | if (sent == 0) |
580 | sent = err; | |
1da177e4 LT |
581 | break; |
582 | } | |
583 | ||
262038fc LAD |
584 | skb->priority = sk->sk_priority; |
585 | ||
1da177e4 LT |
586 | err = rfcomm_dlc_send(d, skb); |
587 | if (err < 0) { | |
588 | kfree_skb(skb); | |
4d6a2188 MH |
589 | if (sent == 0) |
590 | sent = err; | |
1da177e4 LT |
591 | break; |
592 | } | |
593 | ||
594 | sent += size; | |
595 | len -= size; | |
596 | } | |
597 | ||
598 | release_sock(sk); | |
599 | ||
4d6a2188 | 600 | return sent; |
1da177e4 LT |
601 | } |
602 | ||
1da177e4 LT |
603 | static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
604 | struct msghdr *msg, size_t size, int flags) | |
605 | { | |
606 | struct sock *sk = sock->sk; | |
bb23c0ab | 607 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; |
3d7d01df | 608 | int len; |
1da177e4 | 609 | |
bb23c0ab MH |
610 | if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) { |
611 | rfcomm_dlc_accept(d); | |
612 | return 0; | |
613 | } | |
614 | ||
3d7d01df | 615 | len = bt_sock_stream_recvmsg(iocb, sock, msg, size, flags); |
1da177e4 LT |
616 | |
617 | lock_sock(sk); | |
3d7d01df MM |
618 | if (!(flags & MSG_PEEK) && len > 0) |
619 | atomic_sub(len, &sk->sk_rmem_alloc); | |
1da177e4 | 620 | |
1da177e4 LT |
621 | if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2)) |
622 | rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc); | |
1da177e4 | 623 | release_sock(sk); |
3d7d01df MM |
624 | |
625 | return len; | |
1da177e4 LT |
626 | } |
627 | ||
b7058842 | 628 | static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
629 | { |
630 | struct sock *sk = sock->sk; | |
631 | int err = 0; | |
632 | u32 opt; | |
633 | ||
634 | BT_DBG("sk %p", sk); | |
635 | ||
636 | lock_sock(sk); | |
637 | ||
638 | switch (optname) { | |
639 | case RFCOMM_LM: | |
640 | if (get_user(opt, (u32 __user *) optval)) { | |
641 | err = -EFAULT; | |
642 | break; | |
643 | } | |
644 | ||
9f2c8a03 MH |
645 | if (opt & RFCOMM_LM_AUTH) |
646 | rfcomm_pi(sk)->sec_level = BT_SECURITY_LOW; | |
647 | if (opt & RFCOMM_LM_ENCRYPT) | |
648 | rfcomm_pi(sk)->sec_level = BT_SECURITY_MEDIUM; | |
649 | if (opt & RFCOMM_LM_SECURE) | |
650 | rfcomm_pi(sk)->sec_level = BT_SECURITY_HIGH; | |
651 | ||
652 | rfcomm_pi(sk)->role_switch = (opt & RFCOMM_LM_MASTER); | |
1da177e4 LT |
653 | break; |
654 | ||
655 | default: | |
656 | err = -ENOPROTOOPT; | |
657 | break; | |
658 | } | |
659 | ||
660 | release_sock(sk); | |
661 | return err; | |
662 | } | |
663 | ||
b7058842 | 664 | static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
d58daf42 MH |
665 | { |
666 | struct sock *sk = sock->sk; | |
9f2c8a03 | 667 | struct bt_security sec; |
d0fad89d SB |
668 | int err = 0; |
669 | size_t len; | |
bb23c0ab | 670 | u32 opt; |
d58daf42 MH |
671 | |
672 | BT_DBG("sk %p", sk); | |
673 | ||
674 | if (level == SOL_RFCOMM) | |
675 | return rfcomm_sock_setsockopt_old(sock, optname, optval, optlen); | |
676 | ||
0588d94f MH |
677 | if (level != SOL_BLUETOOTH) |
678 | return -ENOPROTOOPT; | |
679 | ||
d58daf42 MH |
680 | lock_sock(sk); |
681 | ||
682 | switch (optname) { | |
9f2c8a03 | 683 | case BT_SECURITY: |
0588d94f MH |
684 | if (sk->sk_type != SOCK_STREAM) { |
685 | err = -EINVAL; | |
686 | break; | |
687 | } | |
688 | ||
9f2c8a03 MH |
689 | sec.level = BT_SECURITY_LOW; |
690 | ||
691 | len = min_t(unsigned int, sizeof(sec), optlen); | |
692 | if (copy_from_user((char *) &sec, optval, len)) { | |
693 | err = -EFAULT; | |
694 | break; | |
695 | } | |
696 | ||
697 | if (sec.level > BT_SECURITY_HIGH) { | |
698 | err = -EINVAL; | |
699 | break; | |
700 | } | |
701 | ||
702 | rfcomm_pi(sk)->sec_level = sec.level; | |
703 | break; | |
704 | ||
bb23c0ab MH |
705 | case BT_DEFER_SETUP: |
706 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
707 | err = -EINVAL; | |
708 | break; | |
709 | } | |
710 | ||
711 | if (get_user(opt, (u32 __user *) optval)) { | |
712 | err = -EFAULT; | |
713 | break; | |
714 | } | |
715 | ||
c5daa683 GP |
716 | if (opt) |
717 | set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); | |
718 | else | |
719 | clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); | |
720 | ||
bb23c0ab MH |
721 | break; |
722 | ||
d58daf42 MH |
723 | default: |
724 | err = -ENOPROTOOPT; | |
725 | break; | |
726 | } | |
727 | ||
728 | release_sock(sk); | |
729 | return err; | |
730 | } | |
731 | ||
732 | static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
1da177e4 LT |
733 | { |
734 | struct sock *sk = sock->sk; | |
1da177e4 | 735 | struct rfcomm_conninfo cinfo; |
8c1d787b | 736 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1da177e4 | 737 | int len, err = 0; |
9f2c8a03 | 738 | u32 opt; |
1da177e4 LT |
739 | |
740 | BT_DBG("sk %p", sk); | |
741 | ||
742 | if (get_user(len, optlen)) | |
743 | return -EFAULT; | |
744 | ||
745 | lock_sock(sk); | |
746 | ||
747 | switch (optname) { | |
748 | case RFCOMM_LM: | |
9f2c8a03 MH |
749 | switch (rfcomm_pi(sk)->sec_level) { |
750 | case BT_SECURITY_LOW: | |
751 | opt = RFCOMM_LM_AUTH; | |
752 | break; | |
753 | case BT_SECURITY_MEDIUM: | |
754 | opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT; | |
755 | break; | |
756 | case BT_SECURITY_HIGH: | |
757 | opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT | | |
758 | RFCOMM_LM_SECURE; | |
759 | break; | |
760 | default: | |
761 | opt = 0; | |
762 | break; | |
763 | } | |
764 | ||
765 | if (rfcomm_pi(sk)->role_switch) | |
766 | opt |= RFCOMM_LM_MASTER; | |
767 | ||
768 | if (put_user(opt, (u32 __user *) optval)) | |
1da177e4 LT |
769 | err = -EFAULT; |
770 | break; | |
771 | ||
772 | case RFCOMM_CONNINFO: | |
bb23c0ab MH |
773 | if (sk->sk_state != BT_CONNECTED && |
774 | !rfcomm_pi(sk)->dlc->defer_setup) { | |
1da177e4 LT |
775 | err = -ENOTCONN; |
776 | break; | |
777 | } | |
778 | ||
8d03e971 | 779 | memset(&cinfo, 0, sizeof(cinfo)); |
8c1d787b GP |
780 | cinfo.hci_handle = conn->hcon->handle; |
781 | memcpy(cinfo.dev_class, conn->hcon->dev_class, 3); | |
1da177e4 LT |
782 | |
783 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
784 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
785 | err = -EFAULT; | |
786 | ||
787 | break; | |
788 | ||
789 | default: | |
790 | err = -ENOPROTOOPT; | |
791 | break; | |
792 | } | |
793 | ||
794 | release_sock(sk); | |
d58daf42 MH |
795 | return err; |
796 | } | |
797 | ||
798 | static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) | |
799 | { | |
800 | struct sock *sk = sock->sk; | |
9f2c8a03 | 801 | struct bt_security sec; |
d58daf42 MH |
802 | int len, err = 0; |
803 | ||
804 | BT_DBG("sk %p", sk); | |
805 | ||
806 | if (level == SOL_RFCOMM) | |
807 | return rfcomm_sock_getsockopt_old(sock, optname, optval, optlen); | |
808 | ||
0588d94f MH |
809 | if (level != SOL_BLUETOOTH) |
810 | return -ENOPROTOOPT; | |
811 | ||
d58daf42 MH |
812 | if (get_user(len, optlen)) |
813 | return -EFAULT; | |
814 | ||
815 | lock_sock(sk); | |
816 | ||
817 | switch (optname) { | |
9f2c8a03 | 818 | case BT_SECURITY: |
0588d94f MH |
819 | if (sk->sk_type != SOCK_STREAM) { |
820 | err = -EINVAL; | |
821 | break; | |
822 | } | |
823 | ||
9f2c8a03 MH |
824 | sec.level = rfcomm_pi(sk)->sec_level; |
825 | ||
826 | len = min_t(unsigned int, len, sizeof(sec)); | |
827 | if (copy_to_user(optval, (char *) &sec, len)) | |
828 | err = -EFAULT; | |
829 | ||
830 | break; | |
831 | ||
bb23c0ab MH |
832 | case BT_DEFER_SETUP: |
833 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
834 | err = -EINVAL; | |
835 | break; | |
836 | } | |
837 | ||
c5daa683 GP |
838 | if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags), |
839 | (u32 __user *) optval)) | |
bb23c0ab MH |
840 | err = -EFAULT; |
841 | ||
842 | break; | |
843 | ||
d58daf42 MH |
844 | default: |
845 | err = -ENOPROTOOPT; | |
846 | break; | |
847 | } | |
848 | ||
849 | release_sock(sk); | |
1da177e4 LT |
850 | return err; |
851 | } | |
852 | ||
853 | static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
854 | { | |
e19caae7 | 855 | struct sock *sk __maybe_unused = sock->sk; |
1da177e4 LT |
856 | int err; |
857 | ||
e19caae7 | 858 | BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg); |
1da177e4 | 859 | |
3241ad82 | 860 | err = bt_sock_ioctl(sock, cmd, arg); |
1da177e4 | 861 | |
3241ad82 | 862 | if (err == -ENOIOCTLCMD) { |
1da177e4 | 863 | #ifdef CONFIG_BT_RFCOMM_TTY |
3241ad82 MH |
864 | lock_sock(sk); |
865 | err = rfcomm_dev_ioctl(sk, cmd, (void __user *) arg); | |
866 | release_sock(sk); | |
1da177e4 | 867 | #else |
3241ad82 | 868 | err = -EOPNOTSUPP; |
1da177e4 | 869 | #endif |
3241ad82 | 870 | } |
1da177e4 | 871 | |
1da177e4 LT |
872 | return err; |
873 | } | |
874 | ||
875 | static int rfcomm_sock_shutdown(struct socket *sock, int how) | |
876 | { | |
877 | struct sock *sk = sock->sk; | |
878 | int err = 0; | |
879 | ||
880 | BT_DBG("sock %p, sk %p", sock, sk); | |
881 | ||
285b4e90 AE |
882 | if (!sk) |
883 | return 0; | |
1da177e4 LT |
884 | |
885 | lock_sock(sk); | |
886 | if (!sk->sk_shutdown) { | |
887 | sk->sk_shutdown = SHUTDOWN_MASK; | |
888 | __rfcomm_sock_close(sk); | |
889 | ||
890 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
891 | err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime); | |
892 | } | |
893 | release_sock(sk); | |
894 | return err; | |
895 | } | |
896 | ||
897 | static int rfcomm_sock_release(struct socket *sock) | |
898 | { | |
899 | struct sock *sk = sock->sk; | |
900 | int err; | |
901 | ||
902 | BT_DBG("sock %p, sk %p", sock, sk); | |
903 | ||
904 | if (!sk) | |
905 | return 0; | |
906 | ||
907 | err = rfcomm_sock_shutdown(sock, 2); | |
908 | ||
909 | sock_orphan(sk); | |
910 | rfcomm_sock_kill(sk); | |
911 | return err; | |
912 | } | |
913 | ||
8e87d142 | 914 | /* ---- RFCOMM core layer callbacks ---- |
1da177e4 LT |
915 | * |
916 | * called under rfcomm_lock() | |
917 | */ | |
918 | int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d) | |
919 | { | |
920 | struct sock *sk, *parent; | |
921 | bdaddr_t src, dst; | |
922 | int result = 0; | |
923 | ||
924 | BT_DBG("session %p channel %d", s, channel); | |
925 | ||
926 | rfcomm_session_getaddr(s, &src, &dst); | |
927 | ||
928 | /* Check if we have socket listening on channel */ | |
929 | parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src); | |
930 | if (!parent) | |
931 | return 0; | |
932 | ||
eeb36656 GP |
933 | bh_lock_sock(parent); |
934 | ||
1da177e4 LT |
935 | /* Check for backlog size */ |
936 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 937 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
938 | goto done; |
939 | } | |
940 | ||
3b1e0a65 | 941 | sk = rfcomm_sock_alloc(sock_net(parent), NULL, BTPROTO_RFCOMM, GFP_ATOMIC); |
1da177e4 LT |
942 | if (!sk) |
943 | goto done; | |
944 | ||
b5a30dda OP |
945 | bt_sock_reclassify_lock(sk, BTPROTO_RFCOMM); |
946 | ||
1da177e4 LT |
947 | rfcomm_sock_init(sk, parent); |
948 | bacpy(&bt_sk(sk)->src, &src); | |
949 | bacpy(&bt_sk(sk)->dst, &dst); | |
950 | rfcomm_pi(sk)->channel = channel; | |
951 | ||
952 | sk->sk_state = BT_CONFIG; | |
953 | bt_accept_enqueue(parent, sk); | |
954 | ||
955 | /* Accept connection and return socket DLC */ | |
956 | *d = rfcomm_pi(sk)->dlc; | |
957 | result = 1; | |
958 | ||
959 | done: | |
960 | bh_unlock_sock(parent); | |
bb23c0ab | 961 | |
c5daa683 | 962 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) |
bb23c0ab MH |
963 | parent->sk_state_change(parent); |
964 | ||
1da177e4 LT |
965 | return result; |
966 | } | |
967 | ||
aef7d97c | 968 | static int rfcomm_sock_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
969 | { |
970 | struct sock *sk; | |
971 | struct hlist_node *node; | |
1da177e4 | 972 | |
95ca83f4 | 973 | read_lock(&rfcomm_sk_list.lock); |
1da177e4 | 974 | |
be9d1227 | 975 | sk_for_each(sk, node, &rfcomm_sk_list.head) { |
aef7d97c MH |
976 | seq_printf(f, "%s %s %d %d\n", |
977 | batostr(&bt_sk(sk)->src), | |
978 | batostr(&bt_sk(sk)->dst), | |
be9d1227 MH |
979 | sk->sk_state, rfcomm_pi(sk)->channel); |
980 | } | |
1da177e4 | 981 | |
95ca83f4 | 982 | read_unlock(&rfcomm_sk_list.lock); |
1da177e4 | 983 | |
aef7d97c | 984 | return 0; |
1da177e4 LT |
985 | } |
986 | ||
aef7d97c MH |
987 | static int rfcomm_sock_debugfs_open(struct inode *inode, struct file *file) |
988 | { | |
989 | return single_open(file, rfcomm_sock_debugfs_show, inode->i_private); | |
990 | } | |
991 | ||
992 | static const struct file_operations rfcomm_sock_debugfs_fops = { | |
993 | .open = rfcomm_sock_debugfs_open, | |
994 | .read = seq_read, | |
995 | .llseek = seq_lseek, | |
996 | .release = single_release, | |
997 | }; | |
998 | ||
999 | static struct dentry *rfcomm_sock_debugfs; | |
1da177e4 | 1000 | |
90ddc4f0 | 1001 | static const struct proto_ops rfcomm_sock_ops = { |
1da177e4 LT |
1002 | .family = PF_BLUETOOTH, |
1003 | .owner = THIS_MODULE, | |
1004 | .release = rfcomm_sock_release, | |
1005 | .bind = rfcomm_sock_bind, | |
1006 | .connect = rfcomm_sock_connect, | |
1007 | .listen = rfcomm_sock_listen, | |
1008 | .accept = rfcomm_sock_accept, | |
1009 | .getname = rfcomm_sock_getname, | |
1010 | .sendmsg = rfcomm_sock_sendmsg, | |
1011 | .recvmsg = rfcomm_sock_recvmsg, | |
1012 | .shutdown = rfcomm_sock_shutdown, | |
1013 | .setsockopt = rfcomm_sock_setsockopt, | |
1014 | .getsockopt = rfcomm_sock_getsockopt, | |
1015 | .ioctl = rfcomm_sock_ioctl, | |
1016 | .poll = bt_sock_poll, | |
1017 | .socketpair = sock_no_socketpair, | |
1018 | .mmap = sock_no_mmap | |
1019 | }; | |
1020 | ||
ec1b4cf7 | 1021 | static const struct net_proto_family rfcomm_sock_family_ops = { |
1da177e4 LT |
1022 | .family = PF_BLUETOOTH, |
1023 | .owner = THIS_MODULE, | |
1024 | .create = rfcomm_sock_create | |
1025 | }; | |
1026 | ||
be9d1227 | 1027 | int __init rfcomm_init_sockets(void) |
1da177e4 LT |
1028 | { |
1029 | int err; | |
1030 | ||
1031 | err = proto_register(&rfcomm_proto, 0); | |
1032 | if (err < 0) | |
1033 | return err; | |
1034 | ||
1035 | err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops); | |
c6f5df16 MY |
1036 | if (err < 0) { |
1037 | BT_ERR("RFCOMM socket layer registration failed"); | |
1038 | goto error; | |
1039 | } | |
1040 | ||
1041 | err = bt_procfs_init(THIS_MODULE, &init_net, "rfcomm", &rfcomm_sk_list, NULL); | |
1042 | if (err < 0) { | |
1043 | BT_ERR("Failed to create RFCOMM proc file"); | |
1044 | bt_sock_unregister(BTPROTO_RFCOMM); | |
1da177e4 | 1045 | goto error; |
c6f5df16 | 1046 | } |
1da177e4 | 1047 | |
aef7d97c MH |
1048 | if (bt_debugfs) { |
1049 | rfcomm_sock_debugfs = debugfs_create_file("rfcomm", 0444, | |
1050 | bt_debugfs, NULL, &rfcomm_sock_debugfs_fops); | |
1051 | if (!rfcomm_sock_debugfs) | |
1052 | BT_ERR("Failed to create RFCOMM debug file"); | |
1053 | } | |
1da177e4 LT |
1054 | |
1055 | BT_INFO("RFCOMM socket layer initialized"); | |
1056 | ||
1057 | return 0; | |
1058 | ||
1059 | error: | |
1da177e4 LT |
1060 | proto_unregister(&rfcomm_proto); |
1061 | return err; | |
1062 | } | |
1063 | ||
2f8362af | 1064 | void __exit rfcomm_cleanup_sockets(void) |
1da177e4 | 1065 | { |
c6f5df16 MY |
1066 | bt_procfs_cleanup(&init_net, "rfcomm"); |
1067 | ||
aef7d97c | 1068 | debugfs_remove(rfcomm_sock_debugfs); |
1da177e4 LT |
1069 | |
1070 | if (bt_sock_unregister(BTPROTO_RFCOMM) < 0) | |
1071 | BT_ERR("RFCOMM socket layer unregistration failed"); | |
1072 | ||
1073 | proto_unregister(&rfcomm_proto); | |
1074 | } |