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; | |
1da177e4 | 110 | |
b67bfe0d | 111 | sk_for_each(sk, &rfcomm_sk_list.head) { |
8e87d142 | 112 | if (rfcomm_pi(sk)->channel == channel && |
1da177e4 LT |
113 | !bacmp(&bt_sk(sk)->src, src)) |
114 | break; | |
115 | } | |
116 | ||
b67bfe0d | 117 | return sk ? sk : NULL; |
1da177e4 LT |
118 | } |
119 | ||
120 | /* Find socket with channel and source bdaddr. | |
121 | * Returns closest match. | |
122 | */ | |
eeb36656 | 123 | static struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src) |
1da177e4 LT |
124 | { |
125 | struct sock *sk = NULL, *sk1 = NULL; | |
1da177e4 | 126 | |
eeb36656 GP |
127 | read_lock(&rfcomm_sk_list.lock); |
128 | ||
b67bfe0d | 129 | sk_for_each(sk, &rfcomm_sk_list.head) { |
1da177e4 LT |
130 | if (state && sk->sk_state != state) |
131 | continue; | |
132 | ||
133 | if (rfcomm_pi(sk)->channel == channel) { | |
134 | /* Exact match. */ | |
135 | if (!bacmp(&bt_sk(sk)->src, src)) | |
136 | break; | |
137 | ||
138 | /* Closest match */ | |
139 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
140 | sk1 = sk; | |
141 | } | |
142 | } | |
1da177e4 | 143 | |
1da177e4 | 144 | read_unlock(&rfcomm_sk_list.lock); |
eeb36656 | 145 | |
b67bfe0d | 146 | return sk ? sk : sk1; |
1da177e4 LT |
147 | } |
148 | ||
149 | static void rfcomm_sock_destruct(struct sock *sk) | |
150 | { | |
151 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
152 | ||
153 | BT_DBG("sk %p dlc %p", sk, d); | |
154 | ||
155 | skb_queue_purge(&sk->sk_receive_queue); | |
156 | skb_queue_purge(&sk->sk_write_queue); | |
157 | ||
158 | rfcomm_dlc_lock(d); | |
159 | rfcomm_pi(sk)->dlc = NULL; | |
160 | ||
161 | /* Detach DLC if it's owned by this socket */ | |
162 | if (d->owner == sk) | |
163 | d->owner = NULL; | |
164 | rfcomm_dlc_unlock(d); | |
165 | ||
166 | rfcomm_dlc_put(d); | |
167 | } | |
168 | ||
169 | static void rfcomm_sock_cleanup_listen(struct sock *parent) | |
170 | { | |
171 | struct sock *sk; | |
172 | ||
173 | BT_DBG("parent %p", parent); | |
174 | ||
175 | /* Close not yet accepted dlcs */ | |
176 | while ((sk = bt_accept_dequeue(parent, NULL))) { | |
177 | rfcomm_sock_close(sk); | |
178 | rfcomm_sock_kill(sk); | |
179 | } | |
180 | ||
181 | parent->sk_state = BT_CLOSED; | |
182 | sock_set_flag(parent, SOCK_ZAPPED); | |
183 | } | |
184 | ||
185 | /* Kill socket (only if zapped and orphan) | |
186 | * Must be called on unlocked socket. | |
187 | */ | |
188 | static void rfcomm_sock_kill(struct sock *sk) | |
189 | { | |
190 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
191 | return; | |
192 | ||
193 | BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
194 | ||
195 | /* Kill poor orphan */ | |
196 | bt_sock_unlink(&rfcomm_sk_list, sk); | |
197 | sock_set_flag(sk, SOCK_DEAD); | |
198 | sock_put(sk); | |
199 | } | |
200 | ||
201 | static void __rfcomm_sock_close(struct sock *sk) | |
202 | { | |
203 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
204 | ||
205 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
206 | ||
207 | switch (sk->sk_state) { | |
208 | case BT_LISTEN: | |
209 | rfcomm_sock_cleanup_listen(sk); | |
210 | break; | |
211 | ||
212 | case BT_CONNECT: | |
213 | case BT_CONNECT2: | |
214 | case BT_CONFIG: | |
215 | case BT_CONNECTED: | |
216 | rfcomm_dlc_close(d, 0); | |
217 | ||
218 | default: | |
219 | sock_set_flag(sk, SOCK_ZAPPED); | |
220 | break; | |
221 | } | |
222 | } | |
223 | ||
224 | /* Close socket. | |
225 | * Must be called on unlocked socket. | |
226 | */ | |
227 | static void rfcomm_sock_close(struct sock *sk) | |
228 | { | |
229 | lock_sock(sk); | |
230 | __rfcomm_sock_close(sk); | |
231 | release_sock(sk); | |
232 | } | |
233 | ||
234 | static void rfcomm_sock_init(struct sock *sk, struct sock *parent) | |
235 | { | |
236 | struct rfcomm_pinfo *pi = rfcomm_pi(sk); | |
237 | ||
238 | BT_DBG("sk %p", sk); | |
239 | ||
240 | if (parent) { | |
241 | sk->sk_type = parent->sk_type; | |
c5daa683 GP |
242 | pi->dlc->defer_setup = test_bit(BT_SK_DEFER_SETUP, |
243 | &bt_sk(parent)->flags); | |
9f2c8a03 MH |
244 | |
245 | pi->sec_level = rfcomm_pi(parent)->sec_level; | |
246 | pi->role_switch = rfcomm_pi(parent)->role_switch; | |
6230c9b4 PM |
247 | |
248 | security_sk_clone(parent, sk); | |
1da177e4 | 249 | } else { |
bb23c0ab | 250 | pi->dlc->defer_setup = 0; |
9f2c8a03 MH |
251 | |
252 | pi->sec_level = BT_SECURITY_LOW; | |
253 | pi->role_switch = 0; | |
1da177e4 LT |
254 | } |
255 | ||
9f2c8a03 MH |
256 | pi->dlc->sec_level = pi->sec_level; |
257 | pi->dlc->role_switch = pi->role_switch; | |
1da177e4 LT |
258 | } |
259 | ||
260 | static struct proto rfcomm_proto = { | |
261 | .name = "RFCOMM", | |
262 | .owner = THIS_MODULE, | |
263 | .obj_size = sizeof(struct rfcomm_pinfo) | |
264 | }; | |
265 | ||
1b8d7ae4 | 266 | static struct sock *rfcomm_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
267 | { |
268 | struct rfcomm_dlc *d; | |
269 | struct sock *sk; | |
270 | ||
6257ff21 | 271 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &rfcomm_proto); |
1da177e4 LT |
272 | if (!sk) |
273 | return NULL; | |
274 | ||
275 | sock_init_data(sock, sk); | |
276 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
277 | ||
278 | d = rfcomm_dlc_alloc(prio); | |
279 | if (!d) { | |
280 | sk_free(sk); | |
281 | return NULL; | |
282 | } | |
283 | ||
284 | d->data_ready = rfcomm_sk_data_ready; | |
285 | d->state_change = rfcomm_sk_state_change; | |
286 | ||
287 | rfcomm_pi(sk)->dlc = d; | |
288 | d->owner = sk; | |
289 | ||
290 | sk->sk_destruct = rfcomm_sock_destruct; | |
291 | sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT; | |
292 | ||
77db1980 MH |
293 | sk->sk_sndbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10; |
294 | sk->sk_rcvbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10; | |
1da177e4 LT |
295 | |
296 | sock_reset_flag(sk, SOCK_ZAPPED); | |
297 | ||
298 | sk->sk_protocol = proto; | |
77db1980 | 299 | sk->sk_state = BT_OPEN; |
1da177e4 LT |
300 | |
301 | bt_sock_link(&rfcomm_sk_list, sk); | |
302 | ||
303 | BT_DBG("sk %p", sk); | |
304 | return sk; | |
305 | } | |
306 | ||
3f378b68 EP |
307 | static int rfcomm_sock_create(struct net *net, struct socket *sock, |
308 | int protocol, int kern) | |
1da177e4 LT |
309 | { |
310 | struct sock *sk; | |
311 | ||
312 | BT_DBG("sock %p", sock); | |
313 | ||
314 | sock->state = SS_UNCONNECTED; | |
315 | ||
316 | if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW) | |
317 | return -ESOCKTNOSUPPORT; | |
318 | ||
319 | sock->ops = &rfcomm_sock_ops; | |
320 | ||
1b8d7ae4 | 321 | sk = rfcomm_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
74da626a | 322 | if (!sk) |
1da177e4 LT |
323 | return -ENOMEM; |
324 | ||
325 | rfcomm_sock_init(sk, NULL); | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
330 | { | |
331 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
332 | struct sock *sk = sock->sk; | |
333 | int err = 0; | |
334 | ||
6ed93dc6 | 335 | BT_DBG("sk %p %pMR", sk, &sa->rc_bdaddr); |
1da177e4 LT |
336 | |
337 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
338 | return -EINVAL; | |
339 | ||
340 | lock_sock(sk); | |
341 | ||
342 | if (sk->sk_state != BT_OPEN) { | |
343 | err = -EBADFD; | |
344 | goto done; | |
345 | } | |
346 | ||
354d28d5 MH |
347 | if (sk->sk_type != SOCK_STREAM) { |
348 | err = -EINVAL; | |
349 | goto done; | |
350 | } | |
351 | ||
95ca83f4 | 352 | write_lock(&rfcomm_sk_list.lock); |
1da177e4 LT |
353 | |
354 | if (sa->rc_channel && __rfcomm_get_sock_by_addr(sa->rc_channel, &sa->rc_bdaddr)) { | |
355 | err = -EADDRINUSE; | |
356 | } else { | |
357 | /* Save source address */ | |
358 | bacpy(&bt_sk(sk)->src, &sa->rc_bdaddr); | |
359 | rfcomm_pi(sk)->channel = sa->rc_channel; | |
360 | sk->sk_state = BT_BOUND; | |
361 | } | |
362 | ||
95ca83f4 | 363 | write_unlock(&rfcomm_sk_list.lock); |
1da177e4 LT |
364 | |
365 | done: | |
366 | release_sock(sk); | |
367 | return err; | |
368 | } | |
369 | ||
370 | static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
371 | { | |
372 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
373 | struct sock *sk = sock->sk; | |
374 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
375 | int err = 0; | |
376 | ||
377 | BT_DBG("sk %p", sk); | |
378 | ||
6503d961 CG |
379 | if (alen < sizeof(struct sockaddr_rc) || |
380 | addr->sa_family != AF_BLUETOOTH) | |
1da177e4 LT |
381 | return -EINVAL; |
382 | ||
354d28d5 | 383 | lock_sock(sk); |
1da177e4 | 384 | |
354d28d5 MH |
385 | if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) { |
386 | err = -EBADFD; | |
387 | goto done; | |
388 | } | |
1da177e4 | 389 | |
354d28d5 MH |
390 | if (sk->sk_type != SOCK_STREAM) { |
391 | err = -EINVAL; | |
392 | goto done; | |
393 | } | |
1da177e4 LT |
394 | |
395 | sk->sk_state = BT_CONNECT; | |
396 | bacpy(&bt_sk(sk)->dst, &sa->rc_bdaddr); | |
397 | rfcomm_pi(sk)->channel = sa->rc_channel; | |
398 | ||
9f2c8a03 MH |
399 | d->sec_level = rfcomm_pi(sk)->sec_level; |
400 | d->role_switch = rfcomm_pi(sk)->role_switch; | |
77db1980 | 401 | |
1da177e4 LT |
402 | err = rfcomm_dlc_open(d, &bt_sk(sk)->src, &sa->rc_bdaddr, sa->rc_channel); |
403 | if (!err) | |
404 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
405 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
406 | ||
354d28d5 | 407 | done: |
1da177e4 LT |
408 | release_sock(sk); |
409 | return err; | |
410 | } | |
411 | ||
412 | static int rfcomm_sock_listen(struct socket *sock, int backlog) | |
413 | { | |
414 | struct sock *sk = sock->sk; | |
415 | int err = 0; | |
416 | ||
417 | BT_DBG("sk %p backlog %d", sk, backlog); | |
418 | ||
419 | lock_sock(sk); | |
420 | ||
421 | if (sk->sk_state != BT_BOUND) { | |
422 | err = -EBADFD; | |
423 | goto done; | |
424 | } | |
425 | ||
354d28d5 MH |
426 | if (sk->sk_type != SOCK_STREAM) { |
427 | err = -EINVAL; | |
428 | goto done; | |
429 | } | |
430 | ||
1da177e4 LT |
431 | if (!rfcomm_pi(sk)->channel) { |
432 | bdaddr_t *src = &bt_sk(sk)->src; | |
433 | u8 channel; | |
434 | ||
435 | err = -EINVAL; | |
436 | ||
95ca83f4 | 437 | write_lock(&rfcomm_sk_list.lock); |
1da177e4 LT |
438 | |
439 | for (channel = 1; channel < 31; channel++) | |
440 | if (!__rfcomm_get_sock_by_addr(channel, src)) { | |
441 | rfcomm_pi(sk)->channel = channel; | |
442 | err = 0; | |
443 | break; | |
444 | } | |
445 | ||
95ca83f4 | 446 | write_unlock(&rfcomm_sk_list.lock); |
1da177e4 LT |
447 | |
448 | if (err < 0) | |
449 | goto done; | |
450 | } | |
451 | ||
452 | sk->sk_max_ack_backlog = backlog; | |
453 | sk->sk_ack_backlog = 0; | |
454 | sk->sk_state = BT_LISTEN; | |
455 | ||
456 | done: | |
457 | release_sock(sk); | |
458 | return err; | |
459 | } | |
460 | ||
461 | static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
462 | { | |
463 | DECLARE_WAITQUEUE(wait, current); | |
464 | struct sock *sk = sock->sk, *nsk; | |
465 | long timeo; | |
466 | int err = 0; | |
467 | ||
dc2a0e20 | 468 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 | 469 | |
354d28d5 MH |
470 | if (sk->sk_type != SOCK_STREAM) { |
471 | err = -EINVAL; | |
472 | goto done; | |
473 | } | |
474 | ||
1da177e4 LT |
475 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
476 | ||
477 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
478 | ||
479 | /* Wait for an incoming connection. (wake-one). */ | |
aa395145 | 480 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
950e2d51 | 481 | while (1) { |
1da177e4 | 482 | set_current_state(TASK_INTERRUPTIBLE); |
950e2d51 PH |
483 | |
484 | if (sk->sk_state != BT_LISTEN) { | |
485 | err = -EBADFD; | |
1da177e4 LT |
486 | break; |
487 | } | |
488 | ||
950e2d51 PH |
489 | nsk = bt_accept_dequeue(sk, newsock); |
490 | if (nsk) | |
491 | break; | |
1da177e4 | 492 | |
950e2d51 PH |
493 | if (!timeo) { |
494 | err = -EAGAIN; | |
1da177e4 LT |
495 | break; |
496 | } | |
497 | ||
498 | if (signal_pending(current)) { | |
499 | err = sock_intr_errno(timeo); | |
500 | break; | |
501 | } | |
950e2d51 PH |
502 | |
503 | release_sock(sk); | |
504 | timeo = schedule_timeout(timeo); | |
dc2a0e20 | 505 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 | 506 | } |
950e2d51 | 507 | __set_current_state(TASK_RUNNING); |
aa395145 | 508 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
509 | |
510 | if (err) | |
511 | goto done; | |
512 | ||
513 | newsock->state = SS_CONNECTED; | |
514 | ||
515 | BT_DBG("new socket %p", nsk); | |
516 | ||
517 | done: | |
518 | release_sock(sk); | |
519 | return err; | |
520 | } | |
521 | ||
522 | static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
523 | { | |
524 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
525 | struct sock *sk = sock->sk; | |
526 | ||
527 | BT_DBG("sock %p, sk %p", sock, sk); | |
528 | ||
9344a972 | 529 | memset(sa, 0, sizeof(*sa)); |
1da177e4 LT |
530 | sa->rc_family = AF_BLUETOOTH; |
531 | sa->rc_channel = rfcomm_pi(sk)->channel; | |
532 | if (peer) | |
533 | bacpy(&sa->rc_bdaddr, &bt_sk(sk)->dst); | |
534 | else | |
535 | bacpy(&sa->rc_bdaddr, &bt_sk(sk)->src); | |
536 | ||
537 | *len = sizeof(struct sockaddr_rc); | |
538 | return 0; | |
539 | } | |
540 | ||
541 | static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock, | |
542 | struct msghdr *msg, size_t len) | |
543 | { | |
544 | struct sock *sk = sock->sk; | |
545 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
546 | struct sk_buff *skb; | |
1da177e4 LT |
547 | int sent = 0; |
548 | ||
bb23c0ab MH |
549 | if (test_bit(RFCOMM_DEFER_SETUP, &d->flags)) |
550 | return -ENOTCONN; | |
551 | ||
1da177e4 LT |
552 | if (msg->msg_flags & MSG_OOB) |
553 | return -EOPNOTSUPP; | |
554 | ||
555 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
556 | return -EPIPE; | |
557 | ||
558 | BT_DBG("sock %p, sk %p", sock, sk); | |
559 | ||
560 | lock_sock(sk); | |
561 | ||
562 | while (len) { | |
563 | size_t size = min_t(size_t, len, d->mtu); | |
4d6a2188 | 564 | int err; |
8e87d142 | 565 | |
1da177e4 LT |
566 | skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE, |
567 | msg->msg_flags & MSG_DONTWAIT, &err); | |
91aa35a5 VS |
568 | if (!skb) { |
569 | if (sent == 0) | |
570 | sent = err; | |
1da177e4 | 571 | break; |
91aa35a5 | 572 | } |
1da177e4 LT |
573 | skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE); |
574 | ||
575 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
576 | if (err) { | |
577 | kfree_skb(skb); | |
4d6a2188 MH |
578 | if (sent == 0) |
579 | sent = err; | |
1da177e4 LT |
580 | break; |
581 | } | |
582 | ||
262038fc LAD |
583 | skb->priority = sk->sk_priority; |
584 | ||
1da177e4 LT |
585 | err = rfcomm_dlc_send(d, skb); |
586 | if (err < 0) { | |
587 | kfree_skb(skb); | |
4d6a2188 MH |
588 | if (sent == 0) |
589 | sent = err; | |
1da177e4 LT |
590 | break; |
591 | } | |
592 | ||
593 | sent += size; | |
594 | len -= size; | |
595 | } | |
596 | ||
597 | release_sock(sk); | |
598 | ||
4d6a2188 | 599 | return sent; |
1da177e4 LT |
600 | } |
601 | ||
1da177e4 LT |
602 | static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
603 | struct msghdr *msg, size_t size, int flags) | |
604 | { | |
605 | struct sock *sk = sock->sk; | |
bb23c0ab | 606 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; |
3d7d01df | 607 | int len; |
1da177e4 | 608 | |
bb23c0ab MH |
609 | if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) { |
610 | rfcomm_dlc_accept(d); | |
e11e0455 | 611 | msg->msg_namelen = 0; |
bb23c0ab MH |
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 | 824 | sec.level = rfcomm_pi(sk)->sec_level; |
9ad2de43 | 825 | sec.key_size = 0; |
9f2c8a03 MH |
826 | |
827 | len = min_t(unsigned int, len, sizeof(sec)); | |
828 | if (copy_to_user(optval, (char *) &sec, len)) | |
829 | err = -EFAULT; | |
830 | ||
831 | break; | |
832 | ||
bb23c0ab MH |
833 | case BT_DEFER_SETUP: |
834 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
835 | err = -EINVAL; | |
836 | break; | |
837 | } | |
838 | ||
c5daa683 GP |
839 | if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags), |
840 | (u32 __user *) optval)) | |
bb23c0ab MH |
841 | err = -EFAULT; |
842 | ||
843 | break; | |
844 | ||
d58daf42 MH |
845 | default: |
846 | err = -ENOPROTOOPT; | |
847 | break; | |
848 | } | |
849 | ||
850 | release_sock(sk); | |
1da177e4 LT |
851 | return err; |
852 | } | |
853 | ||
854 | static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
855 | { | |
e19caae7 | 856 | struct sock *sk __maybe_unused = sock->sk; |
1da177e4 LT |
857 | int err; |
858 | ||
e19caae7 | 859 | BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg); |
1da177e4 | 860 | |
3241ad82 | 861 | err = bt_sock_ioctl(sock, cmd, arg); |
1da177e4 | 862 | |
3241ad82 | 863 | if (err == -ENOIOCTLCMD) { |
1da177e4 | 864 | #ifdef CONFIG_BT_RFCOMM_TTY |
3241ad82 MH |
865 | lock_sock(sk); |
866 | err = rfcomm_dev_ioctl(sk, cmd, (void __user *) arg); | |
867 | release_sock(sk); | |
1da177e4 | 868 | #else |
3241ad82 | 869 | err = -EOPNOTSUPP; |
1da177e4 | 870 | #endif |
3241ad82 | 871 | } |
1da177e4 | 872 | |
1da177e4 LT |
873 | return err; |
874 | } | |
875 | ||
876 | static int rfcomm_sock_shutdown(struct socket *sock, int how) | |
877 | { | |
878 | struct sock *sk = sock->sk; | |
879 | int err = 0; | |
880 | ||
881 | BT_DBG("sock %p, sk %p", sock, sk); | |
882 | ||
285b4e90 AE |
883 | if (!sk) |
884 | return 0; | |
1da177e4 LT |
885 | |
886 | lock_sock(sk); | |
887 | if (!sk->sk_shutdown) { | |
888 | sk->sk_shutdown = SHUTDOWN_MASK; | |
889 | __rfcomm_sock_close(sk); | |
890 | ||
891 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
892 | err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime); | |
893 | } | |
894 | release_sock(sk); | |
895 | return err; | |
896 | } | |
897 | ||
898 | static int rfcomm_sock_release(struct socket *sock) | |
899 | { | |
900 | struct sock *sk = sock->sk; | |
901 | int err; | |
902 | ||
903 | BT_DBG("sock %p, sk %p", sock, sk); | |
904 | ||
905 | if (!sk) | |
906 | return 0; | |
907 | ||
908 | err = rfcomm_sock_shutdown(sock, 2); | |
909 | ||
910 | sock_orphan(sk); | |
911 | rfcomm_sock_kill(sk); | |
912 | return err; | |
913 | } | |
914 | ||
8e87d142 | 915 | /* ---- RFCOMM core layer callbacks ---- |
1da177e4 LT |
916 | * |
917 | * called under rfcomm_lock() | |
918 | */ | |
919 | int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d) | |
920 | { | |
921 | struct sock *sk, *parent; | |
922 | bdaddr_t src, dst; | |
923 | int result = 0; | |
924 | ||
925 | BT_DBG("session %p channel %d", s, channel); | |
926 | ||
927 | rfcomm_session_getaddr(s, &src, &dst); | |
928 | ||
929 | /* Check if we have socket listening on channel */ | |
930 | parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src); | |
931 | if (!parent) | |
932 | return 0; | |
933 | ||
eeb36656 GP |
934 | bh_lock_sock(parent); |
935 | ||
1da177e4 LT |
936 | /* Check for backlog size */ |
937 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 938 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
939 | goto done; |
940 | } | |
941 | ||
3b1e0a65 | 942 | sk = rfcomm_sock_alloc(sock_net(parent), NULL, BTPROTO_RFCOMM, GFP_ATOMIC); |
1da177e4 LT |
943 | if (!sk) |
944 | goto done; | |
945 | ||
b5a30dda OP |
946 | bt_sock_reclassify_lock(sk, BTPROTO_RFCOMM); |
947 | ||
1da177e4 LT |
948 | rfcomm_sock_init(sk, parent); |
949 | bacpy(&bt_sk(sk)->src, &src); | |
950 | bacpy(&bt_sk(sk)->dst, &dst); | |
951 | rfcomm_pi(sk)->channel = channel; | |
952 | ||
953 | sk->sk_state = BT_CONFIG; | |
954 | bt_accept_enqueue(parent, sk); | |
955 | ||
956 | /* Accept connection and return socket DLC */ | |
957 | *d = rfcomm_pi(sk)->dlc; | |
958 | result = 1; | |
959 | ||
960 | done: | |
961 | bh_unlock_sock(parent); | |
bb23c0ab | 962 | |
c5daa683 | 963 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) |
bb23c0ab MH |
964 | parent->sk_state_change(parent); |
965 | ||
1da177e4 LT |
966 | return result; |
967 | } | |
968 | ||
aef7d97c | 969 | static int rfcomm_sock_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
970 | { |
971 | struct sock *sk; | |
1da177e4 | 972 | |
95ca83f4 | 973 | read_lock(&rfcomm_sk_list.lock); |
1da177e4 | 974 | |
b67bfe0d | 975 | sk_for_each(sk, &rfcomm_sk_list.head) { |
fcb73338 AE |
976 | seq_printf(f, "%pMR %pMR %d %d\n", |
977 | &bt_sk(sk)->src, &bt_sk(sk)->dst, | |
978 | sk->sk_state, rfcomm_pi(sk)->channel); | |
be9d1227 | 979 | } |
1da177e4 | 980 | |
95ca83f4 | 981 | read_unlock(&rfcomm_sk_list.lock); |
1da177e4 | 982 | |
aef7d97c | 983 | return 0; |
1da177e4 LT |
984 | } |
985 | ||
aef7d97c MH |
986 | static int rfcomm_sock_debugfs_open(struct inode *inode, struct file *file) |
987 | { | |
988 | return single_open(file, rfcomm_sock_debugfs_show, inode->i_private); | |
989 | } | |
990 | ||
991 | static const struct file_operations rfcomm_sock_debugfs_fops = { | |
992 | .open = rfcomm_sock_debugfs_open, | |
993 | .read = seq_read, | |
994 | .llseek = seq_lseek, | |
995 | .release = single_release, | |
996 | }; | |
997 | ||
998 | static struct dentry *rfcomm_sock_debugfs; | |
1da177e4 | 999 | |
90ddc4f0 | 1000 | static const struct proto_ops rfcomm_sock_ops = { |
1da177e4 LT |
1001 | .family = PF_BLUETOOTH, |
1002 | .owner = THIS_MODULE, | |
1003 | .release = rfcomm_sock_release, | |
1004 | .bind = rfcomm_sock_bind, | |
1005 | .connect = rfcomm_sock_connect, | |
1006 | .listen = rfcomm_sock_listen, | |
1007 | .accept = rfcomm_sock_accept, | |
1008 | .getname = rfcomm_sock_getname, | |
1009 | .sendmsg = rfcomm_sock_sendmsg, | |
1010 | .recvmsg = rfcomm_sock_recvmsg, | |
1011 | .shutdown = rfcomm_sock_shutdown, | |
1012 | .setsockopt = rfcomm_sock_setsockopt, | |
1013 | .getsockopt = rfcomm_sock_getsockopt, | |
1014 | .ioctl = rfcomm_sock_ioctl, | |
1015 | .poll = bt_sock_poll, | |
1016 | .socketpair = sock_no_socketpair, | |
1017 | .mmap = sock_no_mmap | |
1018 | }; | |
1019 | ||
ec1b4cf7 | 1020 | static const struct net_proto_family rfcomm_sock_family_ops = { |
1da177e4 LT |
1021 | .family = PF_BLUETOOTH, |
1022 | .owner = THIS_MODULE, | |
1023 | .create = rfcomm_sock_create | |
1024 | }; | |
1025 | ||
be9d1227 | 1026 | int __init rfcomm_init_sockets(void) |
1da177e4 LT |
1027 | { |
1028 | int err; | |
1029 | ||
1030 | err = proto_register(&rfcomm_proto, 0); | |
1031 | if (err < 0) | |
1032 | return err; | |
1033 | ||
1034 | err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops); | |
c6f5df16 MY |
1035 | if (err < 0) { |
1036 | BT_ERR("RFCOMM socket layer registration failed"); | |
1037 | goto error; | |
1038 | } | |
1039 | ||
1040 | err = bt_procfs_init(THIS_MODULE, &init_net, "rfcomm", &rfcomm_sk_list, NULL); | |
1041 | if (err < 0) { | |
1042 | BT_ERR("Failed to create RFCOMM proc file"); | |
1043 | bt_sock_unregister(BTPROTO_RFCOMM); | |
1da177e4 | 1044 | goto error; |
c6f5df16 | 1045 | } |
1da177e4 | 1046 | |
aef7d97c MH |
1047 | if (bt_debugfs) { |
1048 | rfcomm_sock_debugfs = debugfs_create_file("rfcomm", 0444, | |
1049 | bt_debugfs, NULL, &rfcomm_sock_debugfs_fops); | |
1050 | if (!rfcomm_sock_debugfs) | |
1051 | BT_ERR("Failed to create RFCOMM debug file"); | |
1052 | } | |
1da177e4 LT |
1053 | |
1054 | BT_INFO("RFCOMM socket layer initialized"); | |
1055 | ||
1056 | return 0; | |
1057 | ||
1058 | error: | |
1da177e4 LT |
1059 | proto_unregister(&rfcomm_proto); |
1060 | return err; | |
1061 | } | |
1062 | ||
2f8362af | 1063 | void __exit rfcomm_cleanup_sockets(void) |
1da177e4 | 1064 | { |
c6f5df16 MY |
1065 | bt_procfs_cleanup(&init_net, "rfcomm"); |
1066 | ||
aef7d97c | 1067 | debugfs_remove(rfcomm_sock_debugfs); |
1da177e4 LT |
1068 | |
1069 | if (bt_sock_unregister(BTPROTO_RFCOMM) < 0) | |
1070 | BT_ERR("RFCOMM socket layer unregistration failed"); | |
1071 | ||
1072 | proto_unregister(&rfcomm_proto); | |
1073 | } |