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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | RFCOMM implementation for Linux Bluetooth stack (BlueZ). | |
3 | Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org> | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License version 2 as | |
8 | published by the Free Software Foundation; | |
9 | ||
10 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
11 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
12 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
13 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
14 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
15 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
17 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
18 | ||
19 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
20 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
21 | SOFTWARE IS DISCLAIMED. | |
22 | */ | |
23 | ||
24 | /* | |
25 | * RFCOMM sockets. | |
26 | * | |
27 | * $Id: sock.c,v 1.24 2002/10/03 01:00:34 maxk Exp $ | |
28 | */ | |
29 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | ||
32 | #include <linux/types.h> | |
33 | #include <linux/errno.h> | |
34 | #include <linux/kernel.h> | |
1da177e4 LT |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/fcntl.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/skbuff.h> | |
43 | #include <linux/list.h> | |
be9d1227 | 44 | #include <linux/device.h> |
1da177e4 LT |
45 | #include <net/sock.h> |
46 | ||
47 | #include <asm/system.h> | |
48 | #include <asm/uaccess.h> | |
49 | ||
50 | #include <net/bluetooth/bluetooth.h> | |
51 | #include <net/bluetooth/hci_core.h> | |
52 | #include <net/bluetooth/l2cap.h> | |
53 | #include <net/bluetooth/rfcomm.h> | |
54 | ||
55 | #ifndef CONFIG_BT_RFCOMM_DEBUG | |
56 | #undef BT_DBG | |
57 | #define BT_DBG(D...) | |
58 | #endif | |
59 | ||
90ddc4f0 | 60 | static const struct proto_ops rfcomm_sock_ops; |
1da177e4 LT |
61 | |
62 | static struct bt_sock_list rfcomm_sk_list = { | |
63 | .lock = RW_LOCK_UNLOCKED | |
64 | }; | |
65 | ||
66 | static void rfcomm_sock_close(struct sock *sk); | |
67 | static void rfcomm_sock_kill(struct sock *sk); | |
68 | ||
69 | /* ---- DLC callbacks ---- | |
70 | * | |
71 | * called under rfcomm_dlc_lock() | |
72 | */ | |
73 | static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb) | |
74 | { | |
75 | struct sock *sk = d->owner; | |
76 | if (!sk) | |
77 | return; | |
78 | ||
79 | atomic_add(skb->len, &sk->sk_rmem_alloc); | |
80 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
81 | sk->sk_data_ready(sk, skb->len); | |
82 | ||
83 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) | |
84 | rfcomm_dlc_throttle(d); | |
85 | } | |
86 | ||
87 | static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err) | |
88 | { | |
89 | struct sock *sk = d->owner, *parent; | |
90 | if (!sk) | |
91 | return; | |
92 | ||
93 | BT_DBG("dlc %p state %ld err %d", d, d->state, err); | |
94 | ||
95 | bh_lock_sock(sk); | |
96 | ||
97 | if (err) | |
98 | sk->sk_err = err; | |
99 | ||
100 | sk->sk_state = d->state; | |
101 | ||
102 | parent = bt_sk(sk)->parent; | |
103 | if (parent) { | |
104 | if (d->state == BT_CLOSED) { | |
105 | sock_set_flag(sk, SOCK_ZAPPED); | |
106 | bt_accept_unlink(sk); | |
107 | } | |
108 | parent->sk_data_ready(parent, 0); | |
109 | } else { | |
110 | if (d->state == BT_CONNECTED) | |
111 | rfcomm_session_getaddr(d->session, &bt_sk(sk)->src, NULL); | |
112 | sk->sk_state_change(sk); | |
113 | } | |
114 | ||
115 | bh_unlock_sock(sk); | |
116 | ||
117 | if (parent && sock_flag(sk, SOCK_ZAPPED)) { | |
118 | /* We have to drop DLC lock here, otherwise | |
119 | * rfcomm_sock_destruct() will dead lock. */ | |
120 | rfcomm_dlc_unlock(d); | |
121 | rfcomm_sock_kill(sk); | |
122 | rfcomm_dlc_lock(d); | |
123 | } | |
124 | } | |
125 | ||
126 | /* ---- Socket functions ---- */ | |
127 | static struct sock *__rfcomm_get_sock_by_addr(u8 channel, bdaddr_t *src) | |
128 | { | |
129 | struct sock *sk = NULL; | |
130 | struct hlist_node *node; | |
131 | ||
132 | sk_for_each(sk, node, &rfcomm_sk_list.head) { | |
133 | if (rfcomm_pi(sk)->channel == channel && | |
134 | !bacmp(&bt_sk(sk)->src, src)) | |
135 | break; | |
136 | } | |
137 | ||
138 | return node ? sk : NULL; | |
139 | } | |
140 | ||
141 | /* Find socket with channel and source bdaddr. | |
142 | * Returns closest match. | |
143 | */ | |
144 | static struct sock *__rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src) | |
145 | { | |
146 | struct sock *sk = NULL, *sk1 = NULL; | |
147 | struct hlist_node *node; | |
148 | ||
149 | sk_for_each(sk, node, &rfcomm_sk_list.head) { | |
150 | if (state && sk->sk_state != state) | |
151 | continue; | |
152 | ||
153 | if (rfcomm_pi(sk)->channel == channel) { | |
154 | /* Exact match. */ | |
155 | if (!bacmp(&bt_sk(sk)->src, src)) | |
156 | break; | |
157 | ||
158 | /* Closest match */ | |
159 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
160 | sk1 = sk; | |
161 | } | |
162 | } | |
163 | return node ? sk : sk1; | |
164 | } | |
165 | ||
166 | /* Find socket with given address (channel, src). | |
167 | * Returns locked socket */ | |
168 | static inline struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src) | |
169 | { | |
170 | struct sock *s; | |
171 | read_lock(&rfcomm_sk_list.lock); | |
172 | s = __rfcomm_get_sock_by_channel(state, channel, src); | |
173 | if (s) bh_lock_sock(s); | |
174 | read_unlock(&rfcomm_sk_list.lock); | |
175 | return s; | |
176 | } | |
177 | ||
178 | static void rfcomm_sock_destruct(struct sock *sk) | |
179 | { | |
180 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
181 | ||
182 | BT_DBG("sk %p dlc %p", sk, d); | |
183 | ||
184 | skb_queue_purge(&sk->sk_receive_queue); | |
185 | skb_queue_purge(&sk->sk_write_queue); | |
186 | ||
187 | rfcomm_dlc_lock(d); | |
188 | rfcomm_pi(sk)->dlc = NULL; | |
189 | ||
190 | /* Detach DLC if it's owned by this socket */ | |
191 | if (d->owner == sk) | |
192 | d->owner = NULL; | |
193 | rfcomm_dlc_unlock(d); | |
194 | ||
195 | rfcomm_dlc_put(d); | |
196 | } | |
197 | ||
198 | static void rfcomm_sock_cleanup_listen(struct sock *parent) | |
199 | { | |
200 | struct sock *sk; | |
201 | ||
202 | BT_DBG("parent %p", parent); | |
203 | ||
204 | /* Close not yet accepted dlcs */ | |
205 | while ((sk = bt_accept_dequeue(parent, NULL))) { | |
206 | rfcomm_sock_close(sk); | |
207 | rfcomm_sock_kill(sk); | |
208 | } | |
209 | ||
210 | parent->sk_state = BT_CLOSED; | |
211 | sock_set_flag(parent, SOCK_ZAPPED); | |
212 | } | |
213 | ||
214 | /* Kill socket (only if zapped and orphan) | |
215 | * Must be called on unlocked socket. | |
216 | */ | |
217 | static void rfcomm_sock_kill(struct sock *sk) | |
218 | { | |
219 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
220 | return; | |
221 | ||
222 | BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
223 | ||
224 | /* Kill poor orphan */ | |
225 | bt_sock_unlink(&rfcomm_sk_list, sk); | |
226 | sock_set_flag(sk, SOCK_DEAD); | |
227 | sock_put(sk); | |
228 | } | |
229 | ||
230 | static void __rfcomm_sock_close(struct sock *sk) | |
231 | { | |
232 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
233 | ||
234 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
235 | ||
236 | switch (sk->sk_state) { | |
237 | case BT_LISTEN: | |
238 | rfcomm_sock_cleanup_listen(sk); | |
239 | break; | |
240 | ||
241 | case BT_CONNECT: | |
242 | case BT_CONNECT2: | |
243 | case BT_CONFIG: | |
244 | case BT_CONNECTED: | |
245 | rfcomm_dlc_close(d, 0); | |
246 | ||
247 | default: | |
248 | sock_set_flag(sk, SOCK_ZAPPED); | |
249 | break; | |
250 | } | |
251 | } | |
252 | ||
253 | /* Close socket. | |
254 | * Must be called on unlocked socket. | |
255 | */ | |
256 | static void rfcomm_sock_close(struct sock *sk) | |
257 | { | |
258 | lock_sock(sk); | |
259 | __rfcomm_sock_close(sk); | |
260 | release_sock(sk); | |
261 | } | |
262 | ||
263 | static void rfcomm_sock_init(struct sock *sk, struct sock *parent) | |
264 | { | |
265 | struct rfcomm_pinfo *pi = rfcomm_pi(sk); | |
266 | ||
267 | BT_DBG("sk %p", sk); | |
268 | ||
269 | if (parent) { | |
270 | sk->sk_type = parent->sk_type; | |
271 | pi->link_mode = rfcomm_pi(parent)->link_mode; | |
272 | } else { | |
273 | pi->link_mode = 0; | |
274 | } | |
275 | ||
276 | pi->dlc->link_mode = pi->link_mode; | |
277 | } | |
278 | ||
279 | static struct proto rfcomm_proto = { | |
280 | .name = "RFCOMM", | |
281 | .owner = THIS_MODULE, | |
282 | .obj_size = sizeof(struct rfcomm_pinfo) | |
283 | }; | |
284 | ||
dd0fc66f | 285 | static struct sock *rfcomm_sock_alloc(struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
286 | { |
287 | struct rfcomm_dlc *d; | |
288 | struct sock *sk; | |
289 | ||
290 | sk = sk_alloc(PF_BLUETOOTH, prio, &rfcomm_proto, 1); | |
291 | if (!sk) | |
292 | return NULL; | |
293 | ||
294 | sock_init_data(sock, sk); | |
295 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
296 | ||
297 | d = rfcomm_dlc_alloc(prio); | |
298 | if (!d) { | |
299 | sk_free(sk); | |
300 | return NULL; | |
301 | } | |
302 | ||
303 | d->data_ready = rfcomm_sk_data_ready; | |
304 | d->state_change = rfcomm_sk_state_change; | |
305 | ||
306 | rfcomm_pi(sk)->dlc = d; | |
307 | d->owner = sk; | |
308 | ||
309 | sk->sk_destruct = rfcomm_sock_destruct; | |
310 | sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT; | |
311 | ||
312 | sk->sk_sndbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10; | |
313 | sk->sk_rcvbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10; | |
314 | ||
315 | sock_reset_flag(sk, SOCK_ZAPPED); | |
316 | ||
317 | sk->sk_protocol = proto; | |
318 | sk->sk_state = BT_OPEN; | |
319 | ||
320 | bt_sock_link(&rfcomm_sk_list, sk); | |
321 | ||
322 | BT_DBG("sk %p", sk); | |
323 | return sk; | |
324 | } | |
325 | ||
326 | static int rfcomm_sock_create(struct socket *sock, int protocol) | |
327 | { | |
328 | struct sock *sk; | |
329 | ||
330 | BT_DBG("sock %p", sock); | |
331 | ||
332 | sock->state = SS_UNCONNECTED; | |
333 | ||
334 | if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW) | |
335 | return -ESOCKTNOSUPPORT; | |
336 | ||
337 | sock->ops = &rfcomm_sock_ops; | |
338 | ||
339 | if (!(sk = rfcomm_sock_alloc(sock, protocol, GFP_KERNEL))) | |
340 | return -ENOMEM; | |
341 | ||
342 | rfcomm_sock_init(sk, NULL); | |
343 | return 0; | |
344 | } | |
345 | ||
346 | static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
347 | { | |
348 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
349 | struct sock *sk = sock->sk; | |
350 | int err = 0; | |
351 | ||
352 | BT_DBG("sk %p %s", sk, batostr(&sa->rc_bdaddr)); | |
353 | ||
354 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
355 | return -EINVAL; | |
356 | ||
357 | lock_sock(sk); | |
358 | ||
359 | if (sk->sk_state != BT_OPEN) { | |
360 | err = -EBADFD; | |
361 | goto done; | |
362 | } | |
363 | ||
354d28d5 MH |
364 | if (sk->sk_type != SOCK_STREAM) { |
365 | err = -EINVAL; | |
366 | goto done; | |
367 | } | |
368 | ||
1da177e4 LT |
369 | write_lock_bh(&rfcomm_sk_list.lock); |
370 | ||
371 | if (sa->rc_channel && __rfcomm_get_sock_by_addr(sa->rc_channel, &sa->rc_bdaddr)) { | |
372 | err = -EADDRINUSE; | |
373 | } else { | |
374 | /* Save source address */ | |
375 | bacpy(&bt_sk(sk)->src, &sa->rc_bdaddr); | |
376 | rfcomm_pi(sk)->channel = sa->rc_channel; | |
377 | sk->sk_state = BT_BOUND; | |
378 | } | |
379 | ||
380 | write_unlock_bh(&rfcomm_sk_list.lock); | |
381 | ||
382 | done: | |
383 | release_sock(sk); | |
384 | return err; | |
385 | } | |
386 | ||
387 | static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
388 | { | |
389 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
390 | struct sock *sk = sock->sk; | |
391 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
392 | int err = 0; | |
393 | ||
394 | BT_DBG("sk %p", sk); | |
395 | ||
396 | if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_rc)) | |
397 | return -EINVAL; | |
398 | ||
354d28d5 | 399 | lock_sock(sk); |
1da177e4 | 400 | |
354d28d5 MH |
401 | if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) { |
402 | err = -EBADFD; | |
403 | goto done; | |
404 | } | |
1da177e4 | 405 | |
354d28d5 MH |
406 | if (sk->sk_type != SOCK_STREAM) { |
407 | err = -EINVAL; | |
408 | goto done; | |
409 | } | |
1da177e4 LT |
410 | |
411 | sk->sk_state = BT_CONNECT; | |
412 | bacpy(&bt_sk(sk)->dst, &sa->rc_bdaddr); | |
413 | rfcomm_pi(sk)->channel = sa->rc_channel; | |
414 | ||
415 | err = rfcomm_dlc_open(d, &bt_sk(sk)->src, &sa->rc_bdaddr, sa->rc_channel); | |
416 | if (!err) | |
417 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
418 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
419 | ||
354d28d5 | 420 | done: |
1da177e4 LT |
421 | release_sock(sk); |
422 | return err; | |
423 | } | |
424 | ||
425 | static int rfcomm_sock_listen(struct socket *sock, int backlog) | |
426 | { | |
427 | struct sock *sk = sock->sk; | |
428 | int err = 0; | |
429 | ||
430 | BT_DBG("sk %p backlog %d", sk, backlog); | |
431 | ||
432 | lock_sock(sk); | |
433 | ||
434 | if (sk->sk_state != BT_BOUND) { | |
435 | err = -EBADFD; | |
436 | goto done; | |
437 | } | |
438 | ||
354d28d5 MH |
439 | if (sk->sk_type != SOCK_STREAM) { |
440 | err = -EINVAL; | |
441 | goto done; | |
442 | } | |
443 | ||
1da177e4 LT |
444 | if (!rfcomm_pi(sk)->channel) { |
445 | bdaddr_t *src = &bt_sk(sk)->src; | |
446 | u8 channel; | |
447 | ||
448 | err = -EINVAL; | |
449 | ||
450 | write_lock_bh(&rfcomm_sk_list.lock); | |
451 | ||
452 | for (channel = 1; channel < 31; channel++) | |
453 | if (!__rfcomm_get_sock_by_addr(channel, src)) { | |
454 | rfcomm_pi(sk)->channel = channel; | |
455 | err = 0; | |
456 | break; | |
457 | } | |
458 | ||
459 | write_unlock_bh(&rfcomm_sk_list.lock); | |
460 | ||
461 | if (err < 0) | |
462 | goto done; | |
463 | } | |
464 | ||
465 | sk->sk_max_ack_backlog = backlog; | |
466 | sk->sk_ack_backlog = 0; | |
467 | sk->sk_state = BT_LISTEN; | |
468 | ||
469 | done: | |
470 | release_sock(sk); | |
471 | return err; | |
472 | } | |
473 | ||
474 | static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
475 | { | |
476 | DECLARE_WAITQUEUE(wait, current); | |
477 | struct sock *sk = sock->sk, *nsk; | |
478 | long timeo; | |
479 | int err = 0; | |
480 | ||
481 | lock_sock(sk); | |
482 | ||
483 | if (sk->sk_state != BT_LISTEN) { | |
484 | err = -EBADFD; | |
485 | goto done; | |
486 | } | |
487 | ||
354d28d5 MH |
488 | if (sk->sk_type != SOCK_STREAM) { |
489 | err = -EINVAL; | |
490 | goto done; | |
491 | } | |
492 | ||
1da177e4 LT |
493 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
494 | ||
495 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
496 | ||
497 | /* Wait for an incoming connection. (wake-one). */ | |
498 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
499 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { | |
500 | set_current_state(TASK_INTERRUPTIBLE); | |
501 | if (!timeo) { | |
502 | err = -EAGAIN; | |
503 | break; | |
504 | } | |
505 | ||
506 | release_sock(sk); | |
507 | timeo = schedule_timeout(timeo); | |
508 | lock_sock(sk); | |
509 | ||
510 | if (sk->sk_state != BT_LISTEN) { | |
511 | err = -EBADFD; | |
512 | break; | |
513 | } | |
514 | ||
515 | if (signal_pending(current)) { | |
516 | err = sock_intr_errno(timeo); | |
517 | break; | |
518 | } | |
519 | } | |
520 | set_current_state(TASK_RUNNING); | |
521 | remove_wait_queue(sk->sk_sleep, &wait); | |
522 | ||
523 | if (err) | |
524 | goto done; | |
525 | ||
526 | newsock->state = SS_CONNECTED; | |
527 | ||
528 | BT_DBG("new socket %p", nsk); | |
529 | ||
530 | done: | |
531 | release_sock(sk); | |
532 | return err; | |
533 | } | |
534 | ||
535 | static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
536 | { | |
537 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
538 | struct sock *sk = sock->sk; | |
539 | ||
540 | BT_DBG("sock %p, sk %p", sock, sk); | |
541 | ||
542 | sa->rc_family = AF_BLUETOOTH; | |
543 | sa->rc_channel = rfcomm_pi(sk)->channel; | |
544 | if (peer) | |
545 | bacpy(&sa->rc_bdaddr, &bt_sk(sk)->dst); | |
546 | else | |
547 | bacpy(&sa->rc_bdaddr, &bt_sk(sk)->src); | |
548 | ||
549 | *len = sizeof(struct sockaddr_rc); | |
550 | return 0; | |
551 | } | |
552 | ||
553 | static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock, | |
554 | struct msghdr *msg, size_t len) | |
555 | { | |
556 | struct sock *sk = sock->sk; | |
557 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
558 | struct sk_buff *skb; | |
559 | int err; | |
560 | int sent = 0; | |
561 | ||
562 | if (msg->msg_flags & MSG_OOB) | |
563 | return -EOPNOTSUPP; | |
564 | ||
565 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
566 | return -EPIPE; | |
567 | ||
568 | BT_DBG("sock %p, sk %p", sock, sk); | |
569 | ||
570 | lock_sock(sk); | |
571 | ||
572 | while (len) { | |
573 | size_t size = min_t(size_t, len, d->mtu); | |
574 | ||
575 | skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE, | |
576 | msg->msg_flags & MSG_DONTWAIT, &err); | |
577 | if (!skb) | |
578 | break; | |
579 | skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE); | |
580 | ||
581 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
582 | if (err) { | |
583 | kfree_skb(skb); | |
584 | sent = err; | |
585 | break; | |
586 | } | |
587 | ||
588 | err = rfcomm_dlc_send(d, skb); | |
589 | if (err < 0) { | |
590 | kfree_skb(skb); | |
591 | break; | |
592 | } | |
593 | ||
594 | sent += size; | |
595 | len -= size; | |
596 | } | |
597 | ||
598 | release_sock(sk); | |
599 | ||
600 | return sent ? sent : err; | |
601 | } | |
602 | ||
603 | static long rfcomm_sock_data_wait(struct sock *sk, long timeo) | |
604 | { | |
605 | DECLARE_WAITQUEUE(wait, current); | |
606 | ||
607 | add_wait_queue(sk->sk_sleep, &wait); | |
608 | for (;;) { | |
609 | set_current_state(TASK_INTERRUPTIBLE); | |
610 | ||
b03efcfb DM |
611 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
612 | sk->sk_err || | |
613 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
614 | signal_pending(current) || | |
615 | !timeo) | |
1da177e4 LT |
616 | break; |
617 | ||
618 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
619 | release_sock(sk); | |
620 | timeo = schedule_timeout(timeo); | |
621 | lock_sock(sk); | |
622 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
623 | } | |
624 | ||
625 | __set_current_state(TASK_RUNNING); | |
626 | remove_wait_queue(sk->sk_sleep, &wait); | |
627 | return timeo; | |
628 | } | |
629 | ||
630 | static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
631 | struct msghdr *msg, size_t size, int flags) | |
632 | { | |
633 | struct sock *sk = sock->sk; | |
634 | int err = 0; | |
635 | size_t target, copied = 0; | |
636 | long timeo; | |
637 | ||
638 | if (flags & MSG_OOB) | |
639 | return -EOPNOTSUPP; | |
640 | ||
641 | msg->msg_namelen = 0; | |
642 | ||
643 | BT_DBG("sk %p size %d", sk, size); | |
644 | ||
645 | lock_sock(sk); | |
646 | ||
647 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, size); | |
648 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
649 | ||
650 | do { | |
651 | struct sk_buff *skb; | |
652 | int chunk; | |
653 | ||
654 | skb = skb_dequeue(&sk->sk_receive_queue); | |
655 | if (!skb) { | |
656 | if (copied >= target) | |
657 | break; | |
658 | ||
659 | if ((err = sock_error(sk)) != 0) | |
660 | break; | |
661 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
662 | break; | |
663 | ||
664 | err = -EAGAIN; | |
665 | if (!timeo) | |
666 | break; | |
667 | ||
668 | timeo = rfcomm_sock_data_wait(sk, timeo); | |
669 | ||
670 | if (signal_pending(current)) { | |
671 | err = sock_intr_errno(timeo); | |
672 | goto out; | |
673 | } | |
674 | continue; | |
675 | } | |
676 | ||
677 | chunk = min_t(unsigned int, skb->len, size); | |
678 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
679 | skb_queue_head(&sk->sk_receive_queue, skb); | |
680 | if (!copied) | |
681 | copied = -EFAULT; | |
682 | break; | |
683 | } | |
684 | copied += chunk; | |
685 | size -= chunk; | |
686 | ||
687 | if (!(flags & MSG_PEEK)) { | |
688 | atomic_sub(chunk, &sk->sk_rmem_alloc); | |
689 | ||
690 | skb_pull(skb, chunk); | |
691 | if (skb->len) { | |
692 | skb_queue_head(&sk->sk_receive_queue, skb); | |
693 | break; | |
694 | } | |
695 | kfree_skb(skb); | |
696 | ||
697 | } else { | |
698 | /* put message back and return */ | |
699 | skb_queue_head(&sk->sk_receive_queue, skb); | |
700 | break; | |
701 | } | |
702 | } while (size); | |
703 | ||
704 | out: | |
705 | if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2)) | |
706 | rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc); | |
707 | ||
708 | release_sock(sk); | |
709 | return copied ? : err; | |
710 | } | |
711 | ||
712 | static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) | |
713 | { | |
714 | struct sock *sk = sock->sk; | |
715 | int err = 0; | |
716 | u32 opt; | |
717 | ||
718 | BT_DBG("sk %p", sk); | |
719 | ||
720 | lock_sock(sk); | |
721 | ||
722 | switch (optname) { | |
723 | case RFCOMM_LM: | |
724 | if (get_user(opt, (u32 __user *) optval)) { | |
725 | err = -EFAULT; | |
726 | break; | |
727 | } | |
728 | ||
729 | rfcomm_pi(sk)->link_mode = opt; | |
730 | break; | |
731 | ||
732 | default: | |
733 | err = -ENOPROTOOPT; | |
734 | break; | |
735 | } | |
736 | ||
737 | release_sock(sk); | |
738 | return err; | |
739 | } | |
740 | ||
741 | static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) | |
742 | { | |
743 | struct sock *sk = sock->sk; | |
744 | struct sock *l2cap_sk; | |
745 | struct rfcomm_conninfo cinfo; | |
746 | int len, err = 0; | |
747 | ||
748 | BT_DBG("sk %p", sk); | |
749 | ||
750 | if (get_user(len, optlen)) | |
751 | return -EFAULT; | |
752 | ||
753 | lock_sock(sk); | |
754 | ||
755 | switch (optname) { | |
756 | case RFCOMM_LM: | |
757 | if (put_user(rfcomm_pi(sk)->link_mode, (u32 __user *) optval)) | |
758 | err = -EFAULT; | |
759 | break; | |
760 | ||
761 | case RFCOMM_CONNINFO: | |
762 | if (sk->sk_state != BT_CONNECTED) { | |
763 | err = -ENOTCONN; | |
764 | break; | |
765 | } | |
766 | ||
767 | l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk; | |
768 | ||
769 | cinfo.hci_handle = l2cap_pi(l2cap_sk)->conn->hcon->handle; | |
770 | memcpy(cinfo.dev_class, l2cap_pi(l2cap_sk)->conn->hcon->dev_class, 3); | |
771 | ||
772 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
773 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
774 | err = -EFAULT; | |
775 | ||
776 | break; | |
777 | ||
778 | default: | |
779 | err = -ENOPROTOOPT; | |
780 | break; | |
781 | } | |
782 | ||
783 | release_sock(sk); | |
784 | return err; | |
785 | } | |
786 | ||
787 | static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
788 | { | |
789 | struct sock *sk = sock->sk; | |
790 | int err; | |
791 | ||
792 | lock_sock(sk); | |
793 | ||
794 | #ifdef CONFIG_BT_RFCOMM_TTY | |
795 | err = rfcomm_dev_ioctl(sk, cmd, (void __user *)arg); | |
796 | #else | |
797 | err = -EOPNOTSUPP; | |
798 | #endif | |
799 | ||
800 | release_sock(sk); | |
801 | return err; | |
802 | } | |
803 | ||
804 | static int rfcomm_sock_shutdown(struct socket *sock, int how) | |
805 | { | |
806 | struct sock *sk = sock->sk; | |
807 | int err = 0; | |
808 | ||
809 | BT_DBG("sock %p, sk %p", sock, sk); | |
810 | ||
811 | if (!sk) return 0; | |
812 | ||
813 | lock_sock(sk); | |
814 | if (!sk->sk_shutdown) { | |
815 | sk->sk_shutdown = SHUTDOWN_MASK; | |
816 | __rfcomm_sock_close(sk); | |
817 | ||
818 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
819 | err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime); | |
820 | } | |
821 | release_sock(sk); | |
822 | return err; | |
823 | } | |
824 | ||
825 | static int rfcomm_sock_release(struct socket *sock) | |
826 | { | |
827 | struct sock *sk = sock->sk; | |
828 | int err; | |
829 | ||
830 | BT_DBG("sock %p, sk %p", sock, sk); | |
831 | ||
832 | if (!sk) | |
833 | return 0; | |
834 | ||
835 | err = rfcomm_sock_shutdown(sock, 2); | |
836 | ||
837 | sock_orphan(sk); | |
838 | rfcomm_sock_kill(sk); | |
839 | return err; | |
840 | } | |
841 | ||
842 | /* ---- RFCOMM core layer callbacks ---- | |
843 | * | |
844 | * called under rfcomm_lock() | |
845 | */ | |
846 | int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d) | |
847 | { | |
848 | struct sock *sk, *parent; | |
849 | bdaddr_t src, dst; | |
850 | int result = 0; | |
851 | ||
852 | BT_DBG("session %p channel %d", s, channel); | |
853 | ||
854 | rfcomm_session_getaddr(s, &src, &dst); | |
855 | ||
856 | /* Check if we have socket listening on channel */ | |
857 | parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src); | |
858 | if (!parent) | |
859 | return 0; | |
860 | ||
861 | /* Check for backlog size */ | |
862 | if (sk_acceptq_is_full(parent)) { | |
863 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
864 | goto done; | |
865 | } | |
866 | ||
867 | sk = rfcomm_sock_alloc(NULL, BTPROTO_RFCOMM, GFP_ATOMIC); | |
868 | if (!sk) | |
869 | goto done; | |
870 | ||
871 | rfcomm_sock_init(sk, parent); | |
872 | bacpy(&bt_sk(sk)->src, &src); | |
873 | bacpy(&bt_sk(sk)->dst, &dst); | |
874 | rfcomm_pi(sk)->channel = channel; | |
875 | ||
876 | sk->sk_state = BT_CONFIG; | |
877 | bt_accept_enqueue(parent, sk); | |
878 | ||
879 | /* Accept connection and return socket DLC */ | |
880 | *d = rfcomm_pi(sk)->dlc; | |
881 | result = 1; | |
882 | ||
883 | done: | |
884 | bh_unlock_sock(parent); | |
885 | return result; | |
886 | } | |
887 | ||
be9d1227 | 888 | static ssize_t rfcomm_sock_sysfs_show(struct class *dev, char *buf) |
1da177e4 LT |
889 | { |
890 | struct sock *sk; | |
891 | struct hlist_node *node; | |
be9d1227 | 892 | char *str = buf; |
1da177e4 LT |
893 | |
894 | read_lock_bh(&rfcomm_sk_list.lock); | |
895 | ||
be9d1227 MH |
896 | sk_for_each(sk, node, &rfcomm_sk_list.head) { |
897 | str += sprintf(str, "%s %s %d %d\n", | |
898 | batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), | |
899 | sk->sk_state, rfcomm_pi(sk)->channel); | |
900 | } | |
1da177e4 | 901 | |
1da177e4 | 902 | read_unlock_bh(&rfcomm_sk_list.lock); |
1da177e4 | 903 | |
be9d1227 | 904 | return (str - buf); |
1da177e4 LT |
905 | } |
906 | ||
be9d1227 | 907 | static CLASS_ATTR(rfcomm, S_IRUGO, rfcomm_sock_sysfs_show, NULL); |
1da177e4 | 908 | |
90ddc4f0 | 909 | static const struct proto_ops rfcomm_sock_ops = { |
1da177e4 LT |
910 | .family = PF_BLUETOOTH, |
911 | .owner = THIS_MODULE, | |
912 | .release = rfcomm_sock_release, | |
913 | .bind = rfcomm_sock_bind, | |
914 | .connect = rfcomm_sock_connect, | |
915 | .listen = rfcomm_sock_listen, | |
916 | .accept = rfcomm_sock_accept, | |
917 | .getname = rfcomm_sock_getname, | |
918 | .sendmsg = rfcomm_sock_sendmsg, | |
919 | .recvmsg = rfcomm_sock_recvmsg, | |
920 | .shutdown = rfcomm_sock_shutdown, | |
921 | .setsockopt = rfcomm_sock_setsockopt, | |
922 | .getsockopt = rfcomm_sock_getsockopt, | |
923 | .ioctl = rfcomm_sock_ioctl, | |
924 | .poll = bt_sock_poll, | |
925 | .socketpair = sock_no_socketpair, | |
926 | .mmap = sock_no_mmap | |
927 | }; | |
928 | ||
929 | static struct net_proto_family rfcomm_sock_family_ops = { | |
930 | .family = PF_BLUETOOTH, | |
931 | .owner = THIS_MODULE, | |
932 | .create = rfcomm_sock_create | |
933 | }; | |
934 | ||
be9d1227 | 935 | int __init rfcomm_init_sockets(void) |
1da177e4 LT |
936 | { |
937 | int err; | |
938 | ||
939 | err = proto_register(&rfcomm_proto, 0); | |
940 | if (err < 0) | |
941 | return err; | |
942 | ||
943 | err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops); | |
944 | if (err < 0) | |
945 | goto error; | |
946 | ||
be9d1227 | 947 | class_create_file(&bt_class, &class_attr_rfcomm); |
1da177e4 LT |
948 | |
949 | BT_INFO("RFCOMM socket layer initialized"); | |
950 | ||
951 | return 0; | |
952 | ||
953 | error: | |
954 | BT_ERR("RFCOMM socket layer registration failed"); | |
955 | proto_unregister(&rfcomm_proto); | |
956 | return err; | |
957 | } | |
958 | ||
959 | void __exit rfcomm_cleanup_sockets(void) | |
960 | { | |
be9d1227 | 961 | class_remove_file(&bt_class, &class_attr_rfcomm); |
1da177e4 LT |
962 | |
963 | if (bt_sock_unregister(BTPROTO_RFCOMM) < 0) | |
964 | BT_ERR("RFCOMM socket layer unregistration failed"); | |
965 | ||
966 | proto_unregister(&rfcomm_proto); | |
967 | } |